The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/net/if_spppsubr.c

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    1 /*
    2  * Synchronous PPP/Cisco/Frame Relay link level subroutines.
    3  * Keepalive protocol implemented in both Cisco and PPP modes.
    4  */
    5 /*-
    6  * Copyright (C) 1994-2000 Cronyx Engineering.
    7  * Author: Serge Vakulenko, <vak@cronyx.ru>
    8  *
    9  * Heavily revamped to conform to RFC 1661.
   10  * Copyright (C) 1997, 2001 Joerg Wunsch.
   11  *
   12  * This software is distributed with NO WARRANTIES, not even the implied
   13  * warranties for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
   14  *
   15  * Authors grant any other persons or organisations permission to use
   16  * or modify this software as long as this message is kept with the software,
   17  * all derivative works or modified versions.
   18  *
   19  * From: Version 2.4, Thu Apr 30 17:17:21 MSD 1997
   20  *
   21  * $FreeBSD: stable/8/sys/net/if_spppsubr.c 231380 2012-02-10 13:15:11Z bz $
   22  */
   23 
   24 #include <sys/param.h>
   25 
   26 #include "opt_inet.h"
   27 #include "opt_inet6.h"
   28 #include "opt_ipx.h"
   29 
   30 #include <sys/systm.h>
   31 #include <sys/kernel.h>
   32 #include <sys/module.h>
   33 #include <sys/sockio.h>
   34 #include <sys/socket.h>
   35 #include <sys/syslog.h>
   36 #include <sys/random.h>
   37 #include <sys/malloc.h>
   38 #include <sys/mbuf.h>
   39 
   40 #include <sys/md5.h>
   41 
   42 #include <net/if.h>
   43 #include <net/netisr.h>
   44 #include <net/if_types.h>
   45 #include <net/route.h>
   46 #include <net/vnet.h>
   47 #include <netinet/in.h>
   48 #include <netinet/in_systm.h>
   49 #include <netinet/ip.h>
   50 #include <net/slcompress.h>
   51 
   52 #include <machine/stdarg.h>
   53 
   54 #include <netinet/in_var.h>
   55 
   56 #ifdef INET
   57 #include <netinet/ip.h>
   58 #include <netinet/tcp.h>
   59 #endif
   60 
   61 #ifdef INET6
   62 #include <netinet6/scope6_var.h>
   63 #endif
   64 
   65 #include <netinet/if_ether.h>
   66 
   67 #ifdef IPX
   68 #include <netipx/ipx.h>
   69 #include <netipx/ipx_if.h>
   70 #endif
   71 
   72 #include <net/if_sppp.h>
   73 
   74 #define IOCTL_CMD_T     u_long
   75 #define MAXALIVECNT     3               /* max. alive packets */
   76 
   77 /*
   78  * Interface flags that can be set in an ifconfig command.
   79  *
   80  * Setting link0 will make the link passive, i.e. it will be marked
   81  * as being administrative openable, but won't be opened to begin
   82  * with.  Incoming calls will be answered, or subsequent calls with
   83  * -link1 will cause the administrative open of the LCP layer.
   84  *
   85  * Setting link1 will cause the link to auto-dial only as packets
   86  * arrive to be sent.
   87  *
   88  * Setting IFF_DEBUG will syslog the option negotiation and state
   89  * transitions at level kern.debug.  Note: all logs consistently look
   90  * like
   91  *
   92  *   <if-name><unit>: <proto-name> <additional info...>
   93  *
   94  * with <if-name><unit> being something like "bppp0", and <proto-name>
   95  * being one of "lcp", "ipcp", "cisco", "chap", "pap", etc.
   96  */
   97 
   98 #define IFF_PASSIVE     IFF_LINK0       /* wait passively for connection */
   99 #define IFF_AUTO        IFF_LINK1       /* auto-dial on output */
  100 #define IFF_CISCO       IFF_LINK2       /* auto-dial on output */
  101 
  102 #define PPP_ALLSTATIONS 0xff            /* All-Stations broadcast address */
  103 #define PPP_UI          0x03            /* Unnumbered Information */
  104 #define PPP_IP          0x0021          /* Internet Protocol */
  105 #define PPP_ISO         0x0023          /* ISO OSI Protocol */
  106 #define PPP_XNS         0x0025          /* Xerox NS Protocol */
  107 #define PPP_IPX         0x002b          /* Novell IPX Protocol */
  108 #define PPP_VJ_COMP     0x002d          /* VJ compressed TCP/IP */
  109 #define PPP_VJ_UCOMP    0x002f          /* VJ uncompressed TCP/IP */
  110 #define PPP_IPV6        0x0057          /* Internet Protocol Version 6 */
  111 #define PPP_LCP         0xc021          /* Link Control Protocol */
  112 #define PPP_PAP         0xc023          /* Password Authentication Protocol */
  113 #define PPP_CHAP        0xc223          /* Challenge-Handshake Auth Protocol */
  114 #define PPP_IPCP        0x8021          /* Internet Protocol Control Protocol */
  115 #define PPP_IPV6CP      0x8057          /* IPv6 Control Protocol */
  116 
  117 #define CONF_REQ        1               /* PPP configure request */
  118 #define CONF_ACK        2               /* PPP configure acknowledge */
  119 #define CONF_NAK        3               /* PPP configure negative ack */
  120 #define CONF_REJ        4               /* PPP configure reject */
  121 #define TERM_REQ        5               /* PPP terminate request */
  122 #define TERM_ACK        6               /* PPP terminate acknowledge */
  123 #define CODE_REJ        7               /* PPP code reject */
  124 #define PROTO_REJ       8               /* PPP protocol reject */
  125 #define ECHO_REQ        9               /* PPP echo request */
  126 #define ECHO_REPLY      10              /* PPP echo reply */
  127 #define DISC_REQ        11              /* PPP discard request */
  128 
  129 #define LCP_OPT_MRU             1       /* maximum receive unit */
  130 #define LCP_OPT_ASYNC_MAP       2       /* async control character map */
  131 #define LCP_OPT_AUTH_PROTO      3       /* authentication protocol */
  132 #define LCP_OPT_QUAL_PROTO      4       /* quality protocol */
  133 #define LCP_OPT_MAGIC           5       /* magic number */
  134 #define LCP_OPT_RESERVED        6       /* reserved */
  135 #define LCP_OPT_PROTO_COMP      7       /* protocol field compression */
  136 #define LCP_OPT_ADDR_COMP       8       /* address/control field compression */
  137 
  138 #define IPCP_OPT_ADDRESSES      1       /* both IP addresses; deprecated */
  139 #define IPCP_OPT_COMPRESSION    2       /* IP compression protocol (VJ) */
  140 #define IPCP_OPT_ADDRESS        3       /* local IP address */
  141 
  142 #define IPV6CP_OPT_IFID 1       /* interface identifier */
  143 #define IPV6CP_OPT_COMPRESSION  2       /* IPv6 compression protocol */
  144 
  145 #define IPCP_COMP_VJ            0x2d    /* Code for VJ compression */
  146 
  147 #define PAP_REQ                 1       /* PAP name/password request */
  148 #define PAP_ACK                 2       /* PAP acknowledge */
  149 #define PAP_NAK                 3       /* PAP fail */
  150 
  151 #define CHAP_CHALLENGE          1       /* CHAP challenge request */
  152 #define CHAP_RESPONSE           2       /* CHAP challenge response */
  153 #define CHAP_SUCCESS            3       /* CHAP response ok */
  154 #define CHAP_FAILURE            4       /* CHAP response failed */
  155 
  156 #define CHAP_MD5                5       /* hash algorithm - MD5 */
  157 
  158 #define CISCO_MULTICAST         0x8f    /* Cisco multicast address */
  159 #define CISCO_UNICAST           0x0f    /* Cisco unicast address */
  160 #define CISCO_KEEPALIVE         0x8035  /* Cisco keepalive protocol */
  161 #define CISCO_ADDR_REQ          0       /* Cisco address request */
  162 #define CISCO_ADDR_REPLY        1       /* Cisco address reply */
  163 #define CISCO_KEEPALIVE_REQ     2       /* Cisco keepalive request */
  164 
  165 /* states are named and numbered according to RFC 1661 */
  166 #define STATE_INITIAL   0
  167 #define STATE_STARTING  1
  168 #define STATE_CLOSED    2
  169 #define STATE_STOPPED   3
  170 #define STATE_CLOSING   4
  171 #define STATE_STOPPING  5
  172 #define STATE_REQ_SENT  6
  173 #define STATE_ACK_RCVD  7
  174 #define STATE_ACK_SENT  8
  175 #define STATE_OPENED    9
  176 
  177 MALLOC_DEFINE(M_SPPP, "sppp", "synchronous PPP interface internals");
  178 
  179 struct ppp_header {
  180         u_char address;
  181         u_char control;
  182         u_short protocol;
  183 } __packed;
  184 #define PPP_HEADER_LEN          sizeof (struct ppp_header)
  185 
  186 struct lcp_header {
  187         u_char type;
  188         u_char ident;
  189         u_short len;
  190 } __packed;
  191 #define LCP_HEADER_LEN          sizeof (struct lcp_header)
  192 
  193 struct cisco_packet {
  194         u_long type;
  195         u_long par1;
  196         u_long par2;
  197         u_short rel;
  198         u_short time0;
  199         u_short time1;
  200 } __packed;
  201 #define CISCO_PACKET_LEN        sizeof (struct cisco_packet)
  202 
  203 /*
  204  * We follow the spelling and capitalization of RFC 1661 here, to make
  205  * it easier comparing with the standard.  Please refer to this RFC in
  206  * case you can't make sense out of these abbreviation; it will also
  207  * explain the semantics related to the various events and actions.
  208  */
  209 struct cp {
  210         u_short proto;          /* PPP control protocol number */
  211         u_char protoidx;        /* index into state table in struct sppp */
  212         u_char flags;
  213 #define CP_LCP          0x01    /* this is the LCP */
  214 #define CP_AUTH         0x02    /* this is an authentication protocol */
  215 #define CP_NCP          0x04    /* this is a NCP */
  216 #define CP_QUAL         0x08    /* this is a quality reporting protocol */
  217         const char *name;       /* name of this control protocol */
  218         /* event handlers */
  219         void    (*Up)(struct sppp *sp);
  220         void    (*Down)(struct sppp *sp);
  221         void    (*Open)(struct sppp *sp);
  222         void    (*Close)(struct sppp *sp);
  223         void    (*TO)(void *sp);
  224         int     (*RCR)(struct sppp *sp, struct lcp_header *h, int len);
  225         void    (*RCN_rej)(struct sppp *sp, struct lcp_header *h, int len);
  226         void    (*RCN_nak)(struct sppp *sp, struct lcp_header *h, int len);
  227         /* actions */
  228         void    (*tlu)(struct sppp *sp);
  229         void    (*tld)(struct sppp *sp);
  230         void    (*tls)(struct sppp *sp);
  231         void    (*tlf)(struct sppp *sp);
  232         void    (*scr)(struct sppp *sp);
  233 };
  234 
  235 #define SPP_FMT         "%s: "
  236 #define SPP_ARGS(ifp)   (ifp)->if_xname
  237 
  238 #define SPPP_LOCK(sp)   mtx_lock (&(sp)->mtx)
  239 #define SPPP_UNLOCK(sp) mtx_unlock (&(sp)->mtx)
  240 #define SPPP_LOCK_ASSERT(sp)    mtx_assert (&(sp)->mtx, MA_OWNED)
  241 #define SPPP_LOCK_OWNED(sp)     mtx_owned (&(sp)->mtx)
  242 
  243 #ifdef INET
  244 /*
  245  * The following disgusting hack gets around the problem that IP TOS
  246  * can't be set yet.  We want to put "interactive" traffic on a high
  247  * priority queue.  To decide if traffic is interactive, we check that
  248  * a) it is TCP and b) one of its ports is telnet, rlogin or ftp control.
  249  *
  250  * XXX is this really still necessary?  - joerg -
  251  */
  252 static const u_short interactive_ports[8] = {
  253         0,      513,    0,      0,
  254         0,      21,     0,      23,
  255 };
  256 #define INTERACTIVE(p) (interactive_ports[(p) & 7] == (p))
  257 #endif
  258 
  259 /* almost every function needs these */
  260 #define STDDCL                                                  \
  261         struct ifnet *ifp = SP2IFP(sp);                         \
  262         int debug = ifp->if_flags & IFF_DEBUG
  263 
  264 static int sppp_output(struct ifnet *ifp, struct mbuf *m,
  265                        struct sockaddr *dst, struct route *ro);
  266 
  267 static void sppp_cisco_send(struct sppp *sp, int type, long par1, long par2);
  268 static void sppp_cisco_input(struct sppp *sp, struct mbuf *m);
  269 
  270 static void sppp_cp_input(const struct cp *cp, struct sppp *sp,
  271                           struct mbuf *m);
  272 static void sppp_cp_send(struct sppp *sp, u_short proto, u_char type,
  273                          u_char ident, u_short len, void *data);
  274 /* static void sppp_cp_timeout(void *arg); */
  275 static void sppp_cp_change_state(const struct cp *cp, struct sppp *sp,
  276                                  int newstate);
  277 static void sppp_auth_send(const struct cp *cp,
  278                            struct sppp *sp, unsigned int type, unsigned int id,
  279                            ...);
  280 
  281 static void sppp_up_event(const struct cp *cp, struct sppp *sp);
  282 static void sppp_down_event(const struct cp *cp, struct sppp *sp);
  283 static void sppp_open_event(const struct cp *cp, struct sppp *sp);
  284 static void sppp_close_event(const struct cp *cp, struct sppp *sp);
  285 static void sppp_to_event(const struct cp *cp, struct sppp *sp);
  286 
  287 static void sppp_null(struct sppp *sp);
  288 
  289 static void sppp_pp_up(struct sppp *sp);
  290 static void sppp_pp_down(struct sppp *sp);
  291 
  292 static void sppp_lcp_init(struct sppp *sp);
  293 static void sppp_lcp_up(struct sppp *sp);
  294 static void sppp_lcp_down(struct sppp *sp);
  295 static void sppp_lcp_open(struct sppp *sp);
  296 static void sppp_lcp_close(struct sppp *sp);
  297 static void sppp_lcp_TO(void *sp);
  298 static int sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len);
  299 static void sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len);
  300 static void sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len);
  301 static void sppp_lcp_tlu(struct sppp *sp);
  302 static void sppp_lcp_tld(struct sppp *sp);
  303 static void sppp_lcp_tls(struct sppp *sp);
  304 static void sppp_lcp_tlf(struct sppp *sp);
  305 static void sppp_lcp_scr(struct sppp *sp);
  306 static void sppp_lcp_check_and_close(struct sppp *sp);
  307 static int sppp_ncp_check(struct sppp *sp);
  308 
  309 static void sppp_ipcp_init(struct sppp *sp);
  310 static void sppp_ipcp_up(struct sppp *sp);
  311 static void sppp_ipcp_down(struct sppp *sp);
  312 static void sppp_ipcp_open(struct sppp *sp);
  313 static void sppp_ipcp_close(struct sppp *sp);
  314 static void sppp_ipcp_TO(void *sp);
  315 static int sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len);
  316 static void sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len);
  317 static void sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len);
  318 static void sppp_ipcp_tlu(struct sppp *sp);
  319 static void sppp_ipcp_tld(struct sppp *sp);
  320 static void sppp_ipcp_tls(struct sppp *sp);
  321 static void sppp_ipcp_tlf(struct sppp *sp);
  322 static void sppp_ipcp_scr(struct sppp *sp);
  323 
  324 static void sppp_ipv6cp_init(struct sppp *sp);
  325 static void sppp_ipv6cp_up(struct sppp *sp);
  326 static void sppp_ipv6cp_down(struct sppp *sp);
  327 static void sppp_ipv6cp_open(struct sppp *sp);
  328 static void sppp_ipv6cp_close(struct sppp *sp);
  329 static void sppp_ipv6cp_TO(void *sp);
  330 static int sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len);
  331 static void sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len);
  332 static void sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len);
  333 static void sppp_ipv6cp_tlu(struct sppp *sp);
  334 static void sppp_ipv6cp_tld(struct sppp *sp);
  335 static void sppp_ipv6cp_tls(struct sppp *sp);
  336 static void sppp_ipv6cp_tlf(struct sppp *sp);
  337 static void sppp_ipv6cp_scr(struct sppp *sp);
  338 
  339 static void sppp_pap_input(struct sppp *sp, struct mbuf *m);
  340 static void sppp_pap_init(struct sppp *sp);
  341 static void sppp_pap_open(struct sppp *sp);
  342 static void sppp_pap_close(struct sppp *sp);
  343 static void sppp_pap_TO(void *sp);
  344 static void sppp_pap_my_TO(void *sp);
  345 static void sppp_pap_tlu(struct sppp *sp);
  346 static void sppp_pap_tld(struct sppp *sp);
  347 static void sppp_pap_scr(struct sppp *sp);
  348 
  349 static void sppp_chap_input(struct sppp *sp, struct mbuf *m);
  350 static void sppp_chap_init(struct sppp *sp);
  351 static void sppp_chap_open(struct sppp *sp);
  352 static void sppp_chap_close(struct sppp *sp);
  353 static void sppp_chap_TO(void *sp);
  354 static void sppp_chap_tlu(struct sppp *sp);
  355 static void sppp_chap_tld(struct sppp *sp);
  356 static void sppp_chap_scr(struct sppp *sp);
  357 
  358 static const char *sppp_auth_type_name(u_short proto, u_char type);
  359 static const char *sppp_cp_type_name(u_char type);
  360 #ifdef INET
  361 static const char *sppp_dotted_quad(u_long addr);
  362 static const char *sppp_ipcp_opt_name(u_char opt);
  363 #endif
  364 #ifdef INET6
  365 static const char *sppp_ipv6cp_opt_name(u_char opt);
  366 #endif
  367 static const char *sppp_lcp_opt_name(u_char opt);
  368 static const char *sppp_phase_name(enum ppp_phase phase);
  369 static const char *sppp_proto_name(u_short proto);
  370 static const char *sppp_state_name(int state);
  371 static int sppp_params(struct sppp *sp, u_long cmd, void *data);
  372 static int sppp_strnlen(u_char *p, int max);
  373 static void sppp_keepalive(void *dummy);
  374 static void sppp_phase_network(struct sppp *sp);
  375 static void sppp_print_bytes(const u_char *p, u_short len);
  376 static void sppp_print_string(const char *p, u_short len);
  377 static void sppp_qflush(struct ifqueue *ifq);
  378 #ifdef INET
  379 static void sppp_set_ip_addr(struct sppp *sp, u_long src);
  380 #endif
  381 #ifdef INET6
  382 static void sppp_get_ip6_addrs(struct sppp *sp, struct in6_addr *src,
  383                                struct in6_addr *dst, struct in6_addr *srcmask);
  384 #ifdef IPV6CP_MYIFID_DYN
  385 static void sppp_set_ip6_addr(struct sppp *sp, const struct in6_addr *src);
  386 static void sppp_gen_ip6_addr(struct sppp *sp, const struct in6_addr *src);
  387 #endif
  388 static void sppp_suggest_ip6_addr(struct sppp *sp, struct in6_addr *src);
  389 #endif
  390 
  391 /* if_start () wrapper */
  392 static void sppp_ifstart (struct ifnet *ifp);
  393 
  394 /* our control protocol descriptors */
  395 static const struct cp lcp = {
  396         PPP_LCP, IDX_LCP, CP_LCP, "lcp",
  397         sppp_lcp_up, sppp_lcp_down, sppp_lcp_open, sppp_lcp_close,
  398         sppp_lcp_TO, sppp_lcp_RCR, sppp_lcp_RCN_rej, sppp_lcp_RCN_nak,
  399         sppp_lcp_tlu, sppp_lcp_tld, sppp_lcp_tls, sppp_lcp_tlf,
  400         sppp_lcp_scr
  401 };
  402 
  403 static const struct cp ipcp = {
  404         PPP_IPCP, IDX_IPCP,
  405 #ifdef INET     /* don't run IPCP if there's no IPv4 support */
  406         CP_NCP,
  407 #else
  408         0,
  409 #endif
  410         "ipcp",
  411         sppp_ipcp_up, sppp_ipcp_down, sppp_ipcp_open, sppp_ipcp_close,
  412         sppp_ipcp_TO, sppp_ipcp_RCR, sppp_ipcp_RCN_rej, sppp_ipcp_RCN_nak,
  413         sppp_ipcp_tlu, sppp_ipcp_tld, sppp_ipcp_tls, sppp_ipcp_tlf,
  414         sppp_ipcp_scr
  415 };
  416 
  417 static const struct cp ipv6cp = {
  418         PPP_IPV6CP, IDX_IPV6CP,
  419 #ifdef INET6    /*don't run IPv6CP if there's no IPv6 support*/
  420         CP_NCP,
  421 #else
  422         0,
  423 #endif
  424         "ipv6cp",
  425         sppp_ipv6cp_up, sppp_ipv6cp_down, sppp_ipv6cp_open, sppp_ipv6cp_close,
  426         sppp_ipv6cp_TO, sppp_ipv6cp_RCR, sppp_ipv6cp_RCN_rej, sppp_ipv6cp_RCN_nak,
  427         sppp_ipv6cp_tlu, sppp_ipv6cp_tld, sppp_ipv6cp_tls, sppp_ipv6cp_tlf,
  428         sppp_ipv6cp_scr
  429 };
  430 
  431 static const struct cp pap = {
  432         PPP_PAP, IDX_PAP, CP_AUTH, "pap",
  433         sppp_null, sppp_null, sppp_pap_open, sppp_pap_close,
  434         sppp_pap_TO, 0, 0, 0,
  435         sppp_pap_tlu, sppp_pap_tld, sppp_null, sppp_null,
  436         sppp_pap_scr
  437 };
  438 
  439 static const struct cp chap = {
  440         PPP_CHAP, IDX_CHAP, CP_AUTH, "chap",
  441         sppp_null, sppp_null, sppp_chap_open, sppp_chap_close,
  442         sppp_chap_TO, 0, 0, 0,
  443         sppp_chap_tlu, sppp_chap_tld, sppp_null, sppp_null,
  444         sppp_chap_scr
  445 };
  446 
  447 static const struct cp *cps[IDX_COUNT] = {
  448         &lcp,                   /* IDX_LCP */
  449         &ipcp,                  /* IDX_IPCP */
  450         &ipv6cp,                /* IDX_IPV6CP */
  451         &pap,                   /* IDX_PAP */
  452         &chap,                  /* IDX_CHAP */
  453 };
  454 
  455 static void*
  456 sppp_alloc(u_char type, struct ifnet *ifp)
  457 {
  458         struct sppp     *sp;
  459 
  460         sp = malloc(sizeof(struct sppp), M_SPPP, M_WAITOK | M_ZERO);
  461         sp->pp_ifp = ifp;
  462 
  463         return (sp);
  464 }
  465 
  466 static void
  467 sppp_free(void *com, u_char type)
  468 {
  469 
  470         free(com, M_SPPP);
  471 }
  472 
  473 static int
  474 sppp_modevent(module_t mod, int type, void *unused)
  475 {
  476         switch (type) {
  477         case MOD_LOAD:
  478                 /*
  479                  * XXX: should probably be IFT_SPPP, but it's fairly
  480                  * harmless to allocate struct sppp's for non-sppp
  481                  * interfaces.
  482                  */
  483 
  484                 if_register_com_alloc(IFT_PPP, sppp_alloc, sppp_free);
  485                 break;
  486         case MOD_UNLOAD:
  487                 /* if_deregister_com_alloc(IFT_PPP); */
  488                 return EACCES;
  489         default:
  490                 return EOPNOTSUPP;
  491         }
  492         return 0;
  493 }
  494 static moduledata_t spppmod = {
  495         "sppp",
  496         sppp_modevent,
  497         0
  498 };
  499 MODULE_VERSION(sppp, 1);
  500 DECLARE_MODULE(sppp, spppmod, SI_SUB_DRIVERS, SI_ORDER_ANY);
  501 
  502 /*
  503  * Exported functions, comprising our interface to the lower layer.
  504  */
  505 
  506 /*
  507  * Process the received packet.
  508  */
  509 void
  510 sppp_input(struct ifnet *ifp, struct mbuf *m)
  511 {
  512         struct ppp_header *h;
  513         int isr = -1;
  514         struct sppp *sp = IFP2SP(ifp);
  515         int debug, do_account = 0;
  516 #ifdef INET
  517         int hlen, vjlen;
  518         u_char *iphdr;
  519 #endif
  520 
  521         SPPP_LOCK(sp);
  522         debug = ifp->if_flags & IFF_DEBUG;
  523 
  524         if (ifp->if_flags & IFF_UP)
  525                 /* Count received bytes, add FCS and one flag */
  526                 ifp->if_ibytes += m->m_pkthdr.len + 3;
  527 
  528         if (m->m_pkthdr.len <= PPP_HEADER_LEN) {
  529                 /* Too small packet, drop it. */
  530                 if (debug)
  531                         log(LOG_DEBUG,
  532                             SPP_FMT "input packet is too small, %d bytes\n",
  533                             SPP_ARGS(ifp), m->m_pkthdr.len);
  534           drop:
  535                 m_freem (m);
  536                 SPPP_UNLOCK(sp);
  537           drop2:
  538                 ++ifp->if_ierrors;
  539                 ++ifp->if_iqdrops;
  540                 return;
  541         }
  542 
  543         if (sp->pp_mode == PP_FR) {
  544                 sppp_fr_input (sp, m);
  545                 SPPP_UNLOCK(sp);
  546                 return;
  547         }
  548 
  549         /* Get PPP header. */
  550         h = mtod (m, struct ppp_header*);
  551         m_adj (m, PPP_HEADER_LEN);
  552 
  553         switch (h->address) {
  554         case PPP_ALLSTATIONS:
  555                 if (h->control != PPP_UI)
  556                         goto invalid;
  557                 if (sp->pp_mode == IFF_CISCO) {
  558                         if (debug)
  559                                 log(LOG_DEBUG,
  560                                     SPP_FMT "PPP packet in Cisco mode "
  561                                     "<addr=0x%x ctrl=0x%x proto=0x%x>\n",
  562                                     SPP_ARGS(ifp),
  563                                     h->address, h->control, ntohs(h->protocol));
  564                         goto drop;
  565                 }
  566                 switch (ntohs (h->protocol)) {
  567                 default:
  568                         if (debug)
  569                                 log(LOG_DEBUG,
  570                                     SPP_FMT "rejecting protocol "
  571                                     "<addr=0x%x ctrl=0x%x proto=0x%x>\n",
  572                                     SPP_ARGS(ifp),
  573                                     h->address, h->control, ntohs(h->protocol));
  574                         if (sp->state[IDX_LCP] == STATE_OPENED)
  575                                 sppp_cp_send (sp, PPP_LCP, PROTO_REJ,
  576                                         ++sp->pp_seq[IDX_LCP], m->m_pkthdr.len + 2,
  577                                         &h->protocol);
  578                         ++ifp->if_noproto;
  579                         goto drop;
  580                 case PPP_LCP:
  581                         sppp_cp_input(&lcp, sp, m);
  582                         m_freem (m);
  583                         SPPP_UNLOCK(sp);
  584                         return;
  585                 case PPP_PAP:
  586                         if (sp->pp_phase >= PHASE_AUTHENTICATE)
  587                                 sppp_pap_input(sp, m);
  588                         m_freem (m);
  589                         SPPP_UNLOCK(sp);
  590                         return;
  591                 case PPP_CHAP:
  592                         if (sp->pp_phase >= PHASE_AUTHENTICATE)
  593                                 sppp_chap_input(sp, m);
  594                         m_freem (m);
  595                         SPPP_UNLOCK(sp);
  596                         return;
  597 #ifdef INET
  598                 case PPP_IPCP:
  599                         if (sp->pp_phase == PHASE_NETWORK)
  600                                 sppp_cp_input(&ipcp, sp, m);
  601                         m_freem (m);
  602                         SPPP_UNLOCK(sp);
  603                         return;
  604                 case PPP_IP:
  605                         if (sp->state[IDX_IPCP] == STATE_OPENED) {
  606                                 isr = NETISR_IP;
  607                         }
  608                         do_account++;
  609                         break;
  610                 case PPP_VJ_COMP:
  611                         if (sp->state[IDX_IPCP] == STATE_OPENED) {
  612                                 if ((vjlen =
  613                                      sl_uncompress_tcp_core(mtod(m, u_char *),
  614                                                             m->m_len, m->m_len,
  615                                                             TYPE_COMPRESSED_TCP,
  616                                                             sp->pp_comp,
  617                                                             &iphdr, &hlen)) <= 0) {
  618                                         if (debug)
  619                                                 log(LOG_INFO,
  620                             SPP_FMT "VJ uncompress failed on compressed packet\n",
  621                                                     SPP_ARGS(ifp));
  622                                         goto drop;
  623                                 }
  624 
  625                                 /*
  626                                  * Trim the VJ header off the packet, and prepend
  627                                  * the uncompressed IP header (which will usually
  628                                  * end up in two chained mbufs since there's not
  629                                  * enough leading space in the existing mbuf).
  630                                  */
  631                                 m_adj(m, vjlen);
  632                                 M_PREPEND(m, hlen, M_DONTWAIT);
  633                                 if (m == NULL) {
  634                                         SPPP_UNLOCK(sp);
  635                                         goto drop2;
  636                                 }
  637                                 bcopy(iphdr, mtod(m, u_char *), hlen);
  638                                 isr = NETISR_IP;
  639                         }
  640                         do_account++;
  641                         break;
  642                 case PPP_VJ_UCOMP:
  643                         if (sp->state[IDX_IPCP] == STATE_OPENED) {
  644                                 if (sl_uncompress_tcp_core(mtod(m, u_char *),
  645                                                            m->m_len, m->m_len,
  646                                                            TYPE_UNCOMPRESSED_TCP,
  647                                                            sp->pp_comp,
  648                                                            &iphdr, &hlen) != 0) {
  649                                         if (debug)
  650                                                 log(LOG_INFO,
  651                             SPP_FMT "VJ uncompress failed on uncompressed packet\n",
  652                                                     SPP_ARGS(ifp));
  653                                         goto drop;
  654                                 }
  655                                 isr = NETISR_IP;
  656                         }
  657                         do_account++;
  658                         break;
  659 #endif
  660 #ifdef INET6
  661                 case PPP_IPV6CP:
  662                         if (sp->pp_phase == PHASE_NETWORK)
  663                             sppp_cp_input(&ipv6cp, sp, m);
  664                         m_freem (m);
  665                         SPPP_UNLOCK(sp);
  666                         return;
  667 
  668                 case PPP_IPV6:
  669                         if (sp->state[IDX_IPV6CP] == STATE_OPENED)
  670                                 isr = NETISR_IPV6;
  671                         do_account++;
  672                         break;
  673 #endif
  674 #ifdef IPX
  675                 case PPP_IPX:
  676                         /* IPX IPXCP not implemented yet */
  677                         if (sp->pp_phase == PHASE_NETWORK)
  678                                 isr = NETISR_IPX;
  679                         do_account++;
  680                         break;
  681 #endif
  682                 }
  683                 break;
  684         case CISCO_MULTICAST:
  685         case CISCO_UNICAST:
  686                 /* Don't check the control field here (RFC 1547). */
  687                 if (sp->pp_mode != IFF_CISCO) {
  688                         if (debug)
  689                                 log(LOG_DEBUG,
  690                                     SPP_FMT "Cisco packet in PPP mode "
  691                                     "<addr=0x%x ctrl=0x%x proto=0x%x>\n",
  692                                     SPP_ARGS(ifp),
  693                                     h->address, h->control, ntohs(h->protocol));
  694                         goto drop;
  695                 }
  696                 switch (ntohs (h->protocol)) {
  697                 default:
  698                         ++ifp->if_noproto;
  699                         goto invalid;
  700                 case CISCO_KEEPALIVE:
  701                         sppp_cisco_input (sp, m);
  702                         m_freem (m);
  703                         SPPP_UNLOCK(sp);
  704                         return;
  705 #ifdef INET
  706                 case ETHERTYPE_IP:
  707                         isr = NETISR_IP;
  708                         do_account++;
  709                         break;
  710 #endif
  711 #ifdef INET6
  712                 case ETHERTYPE_IPV6:
  713                         isr = NETISR_IPV6;
  714                         do_account++;
  715                         break;
  716 #endif
  717 #ifdef IPX
  718                 case ETHERTYPE_IPX:
  719                         isr = NETISR_IPX;
  720                         do_account++;
  721                         break;
  722 #endif
  723                 }
  724                 break;
  725         default:        /* Invalid PPP packet. */
  726           invalid:
  727                 if (debug)
  728                         log(LOG_DEBUG,
  729                             SPP_FMT "invalid input packet "
  730                             "<addr=0x%x ctrl=0x%x proto=0x%x>\n",
  731                             SPP_ARGS(ifp),
  732                             h->address, h->control, ntohs(h->protocol));
  733                 goto drop;
  734         }
  735 
  736         if (! (ifp->if_flags & IFF_UP) || isr == -1)
  737                 goto drop;
  738 
  739         SPPP_UNLOCK(sp);
  740         M_SETFIB(m, ifp->if_fib);
  741         /* Check queue. */
  742         if (netisr_queue(isr, m)) {     /* (0) on success. */
  743                 if (debug)
  744                         log(LOG_DEBUG, SPP_FMT "protocol queue overflow\n",
  745                                 SPP_ARGS(ifp));
  746                 goto drop2;
  747         }
  748 
  749         if (do_account)
  750                 /*
  751                  * Do only account for network packets, not for control
  752                  * packets.  This is used by some subsystems to detect
  753                  * idle lines.
  754                  */
  755                 sp->pp_last_recv = time_uptime;
  756 }
  757 
  758 static void
  759 sppp_ifstart_sched(void *dummy)
  760 {
  761         struct sppp *sp = dummy;
  762         
  763         sp->if_start(SP2IFP(sp));
  764 }
  765 
  766 /* if_start () wrapper function. We use it to schedule real if_start () for
  767  * execution. We can't call it directly
  768  */
  769 static void
  770 sppp_ifstart(struct ifnet *ifp)
  771 {
  772         struct sppp *sp = IFP2SP(ifp);
  773 
  774         if (SPPP_LOCK_OWNED(sp)) {
  775                 if (callout_pending(&sp->ifstart_callout))
  776                         return;
  777                 callout_reset(&sp->ifstart_callout, 1, sppp_ifstart_sched,
  778                     (void *)sp); 
  779         } else {
  780                 sp->if_start(ifp);
  781         }
  782 }
  783 
  784 /*
  785  * Enqueue transmit packet.
  786  */
  787 static int
  788 sppp_output(struct ifnet *ifp, struct mbuf *m,
  789             struct sockaddr *dst, struct route *ro)
  790 {
  791         struct sppp *sp = IFP2SP(ifp);
  792         struct ppp_header *h;
  793         struct ifqueue *ifq = NULL;
  794         int s, error, rv = 0;
  795 #ifdef INET
  796         int ipproto = PPP_IP;
  797 #endif
  798         int debug = ifp->if_flags & IFF_DEBUG;
  799 
  800         s = splimp();
  801         SPPP_LOCK(sp);
  802 
  803         if (!(ifp->if_flags & IFF_UP) ||
  804             (!(ifp->if_flags & IFF_AUTO) &&
  805             !(ifp->if_drv_flags & IFF_DRV_RUNNING))) {
  806 #ifdef INET6
  807           drop:
  808 #endif
  809                 m_freem (m);
  810                 SPPP_UNLOCK(sp);
  811                 splx (s);
  812                 return (ENETDOWN);
  813         }
  814 
  815         if ((ifp->if_flags & IFF_AUTO) &&
  816             !(ifp->if_drv_flags & IFF_DRV_RUNNING)) {
  817 #ifdef INET6
  818                 /*
  819                  * XXX
  820                  *
  821                  * Hack to prevent the initialization-time generated
  822                  * IPv6 multicast packet to erroneously cause a
  823                  * dialout event in case IPv6 has been
  824                  * administratively disabled on that interface.
  825                  */
  826                 if (dst->sa_family == AF_INET6 &&
  827                     !(sp->confflags & CONF_ENABLE_IPV6))
  828                         goto drop;
  829 #endif
  830                 /*
  831                  * Interface is not yet running, but auto-dial.  Need
  832                  * to start LCP for it.
  833                  */
  834                 ifp->if_drv_flags |= IFF_DRV_RUNNING;
  835                 splx(s);
  836                 lcp.Open(sp);
  837                 s = splimp();
  838         }
  839 
  840 #ifdef INET
  841         if (dst->sa_family == AF_INET) {
  842                 /* XXX Check mbuf length here? */
  843                 struct ip *ip = mtod (m, struct ip*);
  844                 struct tcphdr *tcp = (struct tcphdr*) ((long*)ip + ip->ip_hl);
  845 
  846                 /*
  847                  * When using dynamic local IP address assignment by using
  848                  * 0.0.0.0 as a local address, the first TCP session will
  849                  * not connect because the local TCP checksum is computed
  850                  * using 0.0.0.0 which will later become our real IP address
  851                  * so the TCP checksum computed at the remote end will
  852                  * become invalid. So we
  853                  * - don't let packets with src ip addr 0 thru
  854                  * - we flag TCP packets with src ip 0 as an error
  855                  */
  856 
  857                 if(ip->ip_src.s_addr == INADDR_ANY)     /* -hm */
  858                 {
  859                         m_freem(m);
  860                         SPPP_UNLOCK(sp);
  861                         splx(s);
  862                         if(ip->ip_p == IPPROTO_TCP)
  863                                 return(EADDRNOTAVAIL);
  864                         else
  865                                 return(0);
  866                 }
  867 
  868                 /*
  869                  * Put low delay, telnet, rlogin and ftp control packets
  870                  * in front of the queue or let ALTQ take care.
  871                  */
  872                 if (ALTQ_IS_ENABLED(&ifp->if_snd))
  873                         ;
  874                 else if (_IF_QFULL(&sp->pp_fastq))
  875                         ;
  876                 else if (ip->ip_tos & IPTOS_LOWDELAY)
  877                         ifq = &sp->pp_fastq;
  878                 else if (m->m_len < sizeof *ip + sizeof *tcp)
  879                         ;
  880                 else if (ip->ip_p != IPPROTO_TCP)
  881                         ;
  882                 else if (INTERACTIVE (ntohs (tcp->th_sport)))
  883                         ifq = &sp->pp_fastq;
  884                 else if (INTERACTIVE (ntohs (tcp->th_dport)))
  885                         ifq = &sp->pp_fastq;
  886 
  887                 /*
  888                  * Do IP Header compression
  889                  */
  890                 if (sp->pp_mode != IFF_CISCO && sp->pp_mode != PP_FR &&
  891                     (sp->ipcp.flags & IPCP_VJ) && ip->ip_p == IPPROTO_TCP)
  892                         switch (sl_compress_tcp(m, ip, sp->pp_comp,
  893                                                 sp->ipcp.compress_cid)) {
  894                         case TYPE_COMPRESSED_TCP:
  895                                 ipproto = PPP_VJ_COMP;
  896                                 break;
  897                         case TYPE_UNCOMPRESSED_TCP:
  898                                 ipproto = PPP_VJ_UCOMP;
  899                                 break;
  900                         case TYPE_IP:
  901                                 ipproto = PPP_IP;
  902                                 break;
  903                         default:
  904                                 m_freem(m);
  905                                 SPPP_UNLOCK(sp);
  906                                 splx(s);
  907                                 return (EINVAL);
  908                         }
  909         }
  910 #endif
  911 
  912 #ifdef INET6
  913         if (dst->sa_family == AF_INET6) {
  914                 /* XXX do something tricky here? */
  915         }
  916 #endif
  917 
  918         if (sp->pp_mode == PP_FR) {
  919                 /* Add frame relay header. */
  920                 m = sppp_fr_header (sp, m, dst->sa_family);
  921                 if (! m)
  922                         goto nobufs;
  923                 goto out;
  924         }
  925 
  926         /*
  927          * Prepend general data packet PPP header. For now, IP only.
  928          */
  929         M_PREPEND (m, PPP_HEADER_LEN, M_DONTWAIT);
  930         if (! m) {
  931 nobufs:         if (debug)
  932                         log(LOG_DEBUG, SPP_FMT "no memory for transmit header\n",
  933                                 SPP_ARGS(ifp));
  934                 ++ifp->if_oerrors;
  935                 SPPP_UNLOCK(sp);
  936                 splx (s);
  937                 return (ENOBUFS);
  938         }
  939         /*
  940          * May want to check size of packet
  941          * (albeit due to the implementation it's always enough)
  942          */
  943         h = mtod (m, struct ppp_header*);
  944         if (sp->pp_mode == IFF_CISCO) {
  945                 h->address = CISCO_UNICAST;        /* unicast address */
  946                 h->control = 0;
  947         } else {
  948                 h->address = PPP_ALLSTATIONS;        /* broadcast address */
  949                 h->control = PPP_UI;                 /* Unnumbered Info */
  950         }
  951 
  952         switch (dst->sa_family) {
  953 #ifdef INET
  954         case AF_INET:   /* Internet Protocol */
  955                 if (sp->pp_mode == IFF_CISCO)
  956                         h->protocol = htons (ETHERTYPE_IP);
  957                 else {
  958                         /*
  959                          * Don't choke with an ENETDOWN early.  It's
  960                          * possible that we just started dialing out,
  961                          * so don't drop the packet immediately.  If
  962                          * we notice that we run out of buffer space
  963                          * below, we will however remember that we are
  964                          * not ready to carry IP packets, and return
  965                          * ENETDOWN, as opposed to ENOBUFS.
  966                          */
  967                         h->protocol = htons(ipproto);
  968                         if (sp->state[IDX_IPCP] != STATE_OPENED)
  969                                 rv = ENETDOWN;
  970                 }
  971                 break;
  972 #endif
  973 #ifdef INET6
  974         case AF_INET6:   /* Internet Protocol */
  975                 if (sp->pp_mode == IFF_CISCO)
  976                         h->protocol = htons (ETHERTYPE_IPV6);
  977                 else {
  978                         /*
  979                          * Don't choke with an ENETDOWN early.  It's
  980                          * possible that we just started dialing out,
  981                          * so don't drop the packet immediately.  If
  982                          * we notice that we run out of buffer space
  983                          * below, we will however remember that we are
  984                          * not ready to carry IP packets, and return
  985                          * ENETDOWN, as opposed to ENOBUFS.
  986                          */
  987                         h->protocol = htons(PPP_IPV6);
  988                         if (sp->state[IDX_IPV6CP] != STATE_OPENED)
  989                                 rv = ENETDOWN;
  990                 }
  991                 break;
  992 #endif
  993 #ifdef IPX
  994         case AF_IPX:     /* Novell IPX Protocol */
  995                 h->protocol = htons (sp->pp_mode == IFF_CISCO ?
  996                         ETHERTYPE_IPX : PPP_IPX);
  997                 break;
  998 #endif
  999         default:
 1000                 m_freem (m);
 1001                 ++ifp->if_oerrors;
 1002                 SPPP_UNLOCK(sp);
 1003                 splx (s);
 1004                 return (EAFNOSUPPORT);
 1005         }
 1006 
 1007         /*
 1008          * Queue message on interface, and start output if interface
 1009          * not yet active.
 1010          */
 1011 out:
 1012         if (ifq != NULL)
 1013                 error = !(IF_HANDOFF_ADJ(ifq, m, ifp, 3));
 1014         else
 1015                 IFQ_HANDOFF_ADJ(ifp, m, 3, error);
 1016         if (error) {
 1017                 ++ifp->if_oerrors;
 1018                 SPPP_UNLOCK(sp);
 1019                 splx (s);
 1020                 return (rv? rv: ENOBUFS);
 1021         }
 1022         SPPP_UNLOCK(sp);
 1023         splx (s);
 1024         /*
 1025          * Unlike in sppp_input(), we can always bump the timestamp
 1026          * here since sppp_output() is only called on behalf of
 1027          * network-layer traffic; control-layer traffic is handled
 1028          * by sppp_cp_send().
 1029          */
 1030         sp->pp_last_sent = time_uptime;
 1031         return (0);
 1032 }
 1033 
 1034 void
 1035 sppp_attach(struct ifnet *ifp)
 1036 {
 1037         struct sppp *sp = IFP2SP(ifp);
 1038 
 1039         /* Initialize mtx lock */
 1040         mtx_init(&sp->mtx, "sppp", MTX_NETWORK_LOCK, MTX_DEF | MTX_RECURSE);
 1041         
 1042         /* Initialize keepalive handler. */
 1043         callout_init(&sp->keepalive_callout, CALLOUT_MPSAFE);
 1044         callout_reset(&sp->keepalive_callout, hz * 10, sppp_keepalive,
 1045                     (void *)sp); 
 1046 
 1047         ifp->if_mtu = PP_MTU;
 1048         ifp->if_flags = IFF_POINTOPOINT | IFF_MULTICAST;
 1049         ifp->if_output = sppp_output;
 1050 #if 0
 1051         sp->pp_flags = PP_KEEPALIVE;
 1052 #endif
 1053         ifp->if_snd.ifq_maxlen = 32;
 1054         sp->pp_fastq.ifq_maxlen = 32;
 1055         sp->pp_cpq.ifq_maxlen = 20;
 1056         sp->pp_loopcnt = 0;
 1057         sp->pp_alivecnt = 0;
 1058         bzero(&sp->pp_seq[0], sizeof(sp->pp_seq));
 1059         bzero(&sp->pp_rseq[0], sizeof(sp->pp_rseq));
 1060         sp->pp_phase = PHASE_DEAD;
 1061         sp->pp_up = sppp_pp_up;
 1062         sp->pp_down = sppp_pp_down;
 1063         if(!mtx_initialized(&sp->pp_cpq.ifq_mtx))
 1064                 mtx_init(&sp->pp_cpq.ifq_mtx, "sppp_cpq", NULL, MTX_DEF);
 1065         if(!mtx_initialized(&sp->pp_fastq.ifq_mtx))
 1066                 mtx_init(&sp->pp_fastq.ifq_mtx, "sppp_fastq", NULL, MTX_DEF);
 1067         sp->pp_last_recv = sp->pp_last_sent = time_uptime;
 1068         sp->confflags = 0;
 1069 #ifdef INET
 1070         sp->confflags |= CONF_ENABLE_VJ;
 1071 #endif
 1072 #ifdef INET6
 1073         sp->confflags |= CONF_ENABLE_IPV6;
 1074 #endif
 1075         callout_init(&sp->ifstart_callout, CALLOUT_MPSAFE);
 1076         sp->if_start = ifp->if_start;
 1077         ifp->if_start = sppp_ifstart;
 1078         sp->pp_comp = malloc(sizeof(struct slcompress), M_TEMP, M_WAITOK);
 1079         sl_compress_init(sp->pp_comp, -1);
 1080         sppp_lcp_init(sp);
 1081         sppp_ipcp_init(sp);
 1082         sppp_ipv6cp_init(sp);
 1083         sppp_pap_init(sp);
 1084         sppp_chap_init(sp);
 1085 }
 1086 
 1087 void
 1088 sppp_detach(struct ifnet *ifp)
 1089 {
 1090         struct sppp *sp = IFP2SP(ifp);
 1091         int i;
 1092 
 1093         KASSERT(mtx_initialized(&sp->mtx), ("sppp mutex is not initialized"));
 1094 
 1095         /* Stop keepalive handler. */
 1096         if (!callout_drain(&sp->keepalive_callout))
 1097                 callout_stop(&sp->keepalive_callout);
 1098 
 1099         for (i = 0; i < IDX_COUNT; i++) {
 1100                 if (!callout_drain(&sp->ch[i]))
 1101                         callout_stop(&sp->ch[i]);
 1102         }
 1103         if (!callout_drain(&sp->pap_my_to_ch))
 1104                 callout_stop(&sp->pap_my_to_ch);
 1105         mtx_destroy(&sp->pp_cpq.ifq_mtx);
 1106         mtx_destroy(&sp->pp_fastq.ifq_mtx);
 1107         mtx_destroy(&sp->mtx);
 1108 }
 1109 
 1110 /*
 1111  * Flush the interface output queue.
 1112  */
 1113 static void
 1114 sppp_flush_unlocked(struct ifnet *ifp)
 1115 {
 1116         struct sppp *sp = IFP2SP(ifp);
 1117 
 1118         sppp_qflush ((struct ifqueue *)&SP2IFP(sp)->if_snd);
 1119         sppp_qflush (&sp->pp_fastq);
 1120         sppp_qflush (&sp->pp_cpq);
 1121 }
 1122 
 1123 void
 1124 sppp_flush(struct ifnet *ifp)
 1125 {
 1126         struct sppp *sp = IFP2SP(ifp);
 1127 
 1128         SPPP_LOCK(sp);
 1129         sppp_flush_unlocked (ifp);
 1130         SPPP_UNLOCK(sp);
 1131 }
 1132 
 1133 /*
 1134  * Check if the output queue is empty.
 1135  */
 1136 int
 1137 sppp_isempty(struct ifnet *ifp)
 1138 {
 1139         struct sppp *sp = IFP2SP(ifp);
 1140         int empty, s;
 1141 
 1142         s = splimp();
 1143         SPPP_LOCK(sp);
 1144         empty = !sp->pp_fastq.ifq_head && !sp->pp_cpq.ifq_head &&
 1145                 !SP2IFP(sp)->if_snd.ifq_head;
 1146         SPPP_UNLOCK(sp);
 1147         splx(s);
 1148         return (empty);
 1149 }
 1150 
 1151 /*
 1152  * Get next packet to send.
 1153  */
 1154 struct mbuf *
 1155 sppp_dequeue(struct ifnet *ifp)
 1156 {
 1157         struct sppp *sp = IFP2SP(ifp);
 1158         struct mbuf *m;
 1159         int s;
 1160 
 1161         s = splimp();
 1162         SPPP_LOCK(sp);
 1163         /*
 1164          * Process only the control protocol queue until we have at
 1165          * least one NCP open.
 1166          *
 1167          * Do always serve all three queues in Cisco mode.
 1168          */
 1169         IF_DEQUEUE(&sp->pp_cpq, m);
 1170         if (m == NULL &&
 1171             (sppp_ncp_check(sp) || sp->pp_mode == IFF_CISCO ||
 1172              sp->pp_mode == PP_FR)) {
 1173                 IF_DEQUEUE(&sp->pp_fastq, m);
 1174                 if (m == NULL)
 1175                         IF_DEQUEUE (&SP2IFP(sp)->if_snd, m);
 1176         }
 1177         SPPP_UNLOCK(sp);
 1178         splx(s);
 1179         return m;
 1180 }
 1181 
 1182 /*
 1183  * Pick the next packet, do not remove it from the queue.
 1184  */
 1185 struct mbuf *
 1186 sppp_pick(struct ifnet *ifp)
 1187 {
 1188         struct sppp *sp = IFP2SP(ifp);
 1189         struct mbuf *m;
 1190         int s;
 1191 
 1192         s = splimp ();
 1193         SPPP_LOCK(sp);
 1194 
 1195         m = sp->pp_cpq.ifq_head;
 1196         if (m == NULL &&
 1197             (sp->pp_phase == PHASE_NETWORK ||
 1198              sp->pp_mode == IFF_CISCO ||
 1199              sp->pp_mode == PP_FR))
 1200                 if ((m = sp->pp_fastq.ifq_head) == NULL)
 1201                         m = SP2IFP(sp)->if_snd.ifq_head;
 1202         SPPP_UNLOCK(sp);
 1203         splx (s);
 1204         return (m);
 1205 }
 1206 
 1207 /*
 1208  * Process an ioctl request.  Called on low priority level.
 1209  */
 1210 int
 1211 sppp_ioctl(struct ifnet *ifp, IOCTL_CMD_T cmd, void *data)
 1212 {
 1213         struct ifreq *ifr = (struct ifreq*) data;
 1214         struct sppp *sp = IFP2SP(ifp);
 1215         int s, rv, going_up, going_down, newmode;
 1216 
 1217         s = splimp();
 1218         SPPP_LOCK(sp);
 1219         rv = 0;
 1220         switch (cmd) {
 1221         case SIOCAIFADDR:
 1222         case SIOCSIFDSTADDR:
 1223                 break;
 1224 
 1225         case SIOCSIFADDR:
 1226                 /* set the interface "up" when assigning an IP address */
 1227                 ifp->if_flags |= IFF_UP;
 1228                 /* FALLTHROUGH */
 1229 
 1230         case SIOCSIFFLAGS:
 1231                 going_up = ifp->if_flags & IFF_UP &&
 1232                         (ifp->if_drv_flags & IFF_DRV_RUNNING) == 0;
 1233                 going_down = (ifp->if_flags & IFF_UP) == 0 &&
 1234                         ifp->if_drv_flags & IFF_DRV_RUNNING;
 1235 
 1236                 newmode = ifp->if_flags & IFF_PASSIVE;
 1237                 if (!newmode)
 1238                         newmode = ifp->if_flags & IFF_AUTO;
 1239                 if (!newmode)
 1240                         newmode = ifp->if_flags & IFF_CISCO;
 1241                 ifp->if_flags &= ~(IFF_PASSIVE | IFF_AUTO | IFF_CISCO);
 1242                 ifp->if_flags |= newmode;
 1243 
 1244                 if (!newmode)
 1245                         newmode = sp->pp_flags & PP_FR;
 1246 
 1247                 if (newmode != sp->pp_mode) {
 1248                         going_down = 1;
 1249                         if (!going_up)
 1250                                 going_up = ifp->if_drv_flags & IFF_DRV_RUNNING;
 1251                 }
 1252 
 1253                 if (going_down) {
 1254                         if (sp->pp_mode != IFF_CISCO &&
 1255                             sp->pp_mode != PP_FR)
 1256                                 lcp.Close(sp);
 1257                         else if (sp->pp_tlf)
 1258                                 (sp->pp_tlf)(sp);
 1259                         sppp_flush_unlocked(ifp);
 1260                         ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
 1261                         sp->pp_mode = newmode;
 1262                 }
 1263 
 1264                 if (going_up) {
 1265                         if (sp->pp_mode != IFF_CISCO &&
 1266                             sp->pp_mode != PP_FR)
 1267                                 lcp.Close(sp);
 1268                         sp->pp_mode = newmode;
 1269                         if (sp->pp_mode == 0) {
 1270                                 ifp->if_drv_flags |= IFF_DRV_RUNNING;
 1271                                 lcp.Open(sp);
 1272                         }
 1273                         if ((sp->pp_mode == IFF_CISCO) ||
 1274                             (sp->pp_mode == PP_FR)) {
 1275                                 if (sp->pp_tls)
 1276                                         (sp->pp_tls)(sp);
 1277                                 ifp->if_drv_flags |= IFF_DRV_RUNNING;
 1278                         }
 1279                 }
 1280 
 1281                 break;
 1282 
 1283 #ifdef SIOCSIFMTU
 1284 #ifndef ifr_mtu
 1285 #define ifr_mtu ifr_metric
 1286 #endif
 1287         case SIOCSIFMTU:
 1288                 if (ifr->ifr_mtu < 128 || ifr->ifr_mtu > sp->lcp.their_mru)
 1289                         return (EINVAL);
 1290                 ifp->if_mtu = ifr->ifr_mtu;
 1291                 break;
 1292 #endif
 1293 #ifdef SLIOCSETMTU
 1294         case SLIOCSETMTU:
 1295                 if (*(short*)data < 128 || *(short*)data > sp->lcp.their_mru)
 1296                         return (EINVAL);
 1297                 ifp->if_mtu = *(short*)data;
 1298                 break;
 1299 #endif
 1300 #ifdef SIOCGIFMTU
 1301         case SIOCGIFMTU:
 1302                 ifr->ifr_mtu = ifp->if_mtu;
 1303                 break;
 1304 #endif
 1305 #ifdef SLIOCGETMTU
 1306         case SLIOCGETMTU:
 1307                 *(short*)data = ifp->if_mtu;
 1308                 break;
 1309 #endif
 1310         case SIOCADDMULTI:
 1311         case SIOCDELMULTI:
 1312                 break;
 1313 
 1314         case SIOCGIFGENERIC:
 1315         case SIOCSIFGENERIC:
 1316                 rv = sppp_params(sp, cmd, data);
 1317                 break;
 1318 
 1319         default:
 1320                 rv = ENOTTY;
 1321         }
 1322         SPPP_UNLOCK(sp);
 1323         splx(s);
 1324         return rv;
 1325 }
 1326 
 1327 /*
 1328  * Cisco framing implementation.
 1329  */
 1330 
 1331 /*
 1332  * Handle incoming Cisco keepalive protocol packets.
 1333  */
 1334 static void
 1335 sppp_cisco_input(struct sppp *sp, struct mbuf *m)
 1336 {
 1337         STDDCL;
 1338         struct cisco_packet *h;
 1339         u_long me, mymask;
 1340 
 1341         if (m->m_pkthdr.len < CISCO_PACKET_LEN) {
 1342                 if (debug)
 1343                         log(LOG_DEBUG,
 1344                             SPP_FMT "cisco invalid packet length: %d bytes\n",
 1345                             SPP_ARGS(ifp), m->m_pkthdr.len);
 1346                 return;
 1347         }
 1348         h = mtod (m, struct cisco_packet*);
 1349         if (debug)
 1350                 log(LOG_DEBUG,
 1351                     SPP_FMT "cisco input: %d bytes "
 1352                     "<0x%lx 0x%lx 0x%lx 0x%x 0x%x-0x%x>\n",
 1353                     SPP_ARGS(ifp), m->m_pkthdr.len,
 1354                     (u_long)ntohl (h->type), (u_long)h->par1, (u_long)h->par2, (u_int)h->rel,
 1355                     (u_int)h->time0, (u_int)h->time1);
 1356         switch (ntohl (h->type)) {
 1357         default:
 1358                 if (debug)
 1359                         log(-1, SPP_FMT "cisco unknown packet type: 0x%lx\n",
 1360                                SPP_ARGS(ifp), (u_long)ntohl (h->type));
 1361                 break;
 1362         case CISCO_ADDR_REPLY:
 1363                 /* Reply on address request, ignore */
 1364                 break;
 1365         case CISCO_KEEPALIVE_REQ:
 1366                 sp->pp_alivecnt = 0;
 1367                 sp->pp_rseq[IDX_LCP] = ntohl (h->par1);
 1368                 if (sp->pp_seq[IDX_LCP] == sp->pp_rseq[IDX_LCP]) {
 1369                         /* Local and remote sequence numbers are equal.
 1370                          * Probably, the line is in loopback mode. */
 1371                         if (sp->pp_loopcnt >= MAXALIVECNT) {
 1372                                 printf (SPP_FMT "loopback\n",
 1373                                         SPP_ARGS(ifp));
 1374                                 sp->pp_loopcnt = 0;
 1375                                 if (ifp->if_flags & IFF_UP) {
 1376                                         if_down (ifp);
 1377                                         sppp_qflush (&sp->pp_cpq);
 1378                                 }
 1379                         }
 1380                         ++sp->pp_loopcnt;
 1381 
 1382                         /* Generate new local sequence number */
 1383                         sp->pp_seq[IDX_LCP] = random();
 1384                         break;
 1385                 }
 1386                 sp->pp_loopcnt = 0;
 1387                 if (! (ifp->if_flags & IFF_UP) &&
 1388                     (ifp->if_drv_flags & IFF_DRV_RUNNING)) {
 1389                         if_up(ifp);
 1390                         printf (SPP_FMT "up\n", SPP_ARGS(ifp));
 1391                 }
 1392                 break;
 1393         case CISCO_ADDR_REQ:
 1394                 sppp_get_ip_addrs(sp, &me, 0, &mymask);
 1395                 if (me != 0L)
 1396                         sppp_cisco_send(sp, CISCO_ADDR_REPLY, me, mymask);
 1397                 break;
 1398         }
 1399 }
 1400 
 1401 /*
 1402  * Send Cisco keepalive packet.
 1403  */
 1404 static void
 1405 sppp_cisco_send(struct sppp *sp, int type, long par1, long par2)
 1406 {
 1407         STDDCL;
 1408         struct ppp_header *h;
 1409         struct cisco_packet *ch;
 1410         struct mbuf *m;
 1411         struct timeval tv;
 1412 
 1413         getmicrouptime(&tv);
 1414 
 1415         MGETHDR (m, M_DONTWAIT, MT_DATA);
 1416         if (! m)
 1417                 return;
 1418         m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + CISCO_PACKET_LEN;
 1419         m->m_pkthdr.rcvif = 0;
 1420 
 1421         h = mtod (m, struct ppp_header*);
 1422         h->address = CISCO_MULTICAST;
 1423         h->control = 0;
 1424         h->protocol = htons (CISCO_KEEPALIVE);
 1425 
 1426         ch = (struct cisco_packet*) (h + 1);
 1427         ch->type = htonl (type);
 1428         ch->par1 = htonl (par1);
 1429         ch->par2 = htonl (par2);
 1430         ch->rel = -1;
 1431 
 1432         ch->time0 = htons ((u_short) (tv.tv_sec >> 16));
 1433         ch->time1 = htons ((u_short) tv.tv_sec);
 1434 
 1435         if (debug)
 1436                 log(LOG_DEBUG,
 1437                     SPP_FMT "cisco output: <0x%lx 0x%lx 0x%lx 0x%x 0x%x-0x%x>\n",
 1438                         SPP_ARGS(ifp), (u_long)ntohl (ch->type), (u_long)ch->par1,
 1439                         (u_long)ch->par2, (u_int)ch->rel, (u_int)ch->time0, (u_int)ch->time1);
 1440 
 1441         if (! IF_HANDOFF_ADJ(&sp->pp_cpq, m, ifp, 3))
 1442                 ifp->if_oerrors++;
 1443 }
 1444 
 1445 /*
 1446  * PPP protocol implementation.
 1447  */
 1448 
 1449 /*
 1450  * Send PPP control protocol packet.
 1451  */
 1452 static void
 1453 sppp_cp_send(struct sppp *sp, u_short proto, u_char type,
 1454              u_char ident, u_short len, void *data)
 1455 {
 1456         STDDCL;
 1457         struct ppp_header *h;
 1458         struct lcp_header *lh;
 1459         struct mbuf *m;
 1460 
 1461         if (len > MHLEN - PPP_HEADER_LEN - LCP_HEADER_LEN)
 1462                 len = MHLEN - PPP_HEADER_LEN - LCP_HEADER_LEN;
 1463         MGETHDR (m, M_DONTWAIT, MT_DATA);
 1464         if (! m)
 1465                 return;
 1466         m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + LCP_HEADER_LEN + len;
 1467         m->m_pkthdr.rcvif = 0;
 1468 
 1469         h = mtod (m, struct ppp_header*);
 1470         h->address = PPP_ALLSTATIONS;        /* broadcast address */
 1471         h->control = PPP_UI;                 /* Unnumbered Info */
 1472         h->protocol = htons (proto);         /* Link Control Protocol */
 1473 
 1474         lh = (struct lcp_header*) (h + 1);
 1475         lh->type = type;
 1476         lh->ident = ident;
 1477         lh->len = htons (LCP_HEADER_LEN + len);
 1478         if (len)
 1479                 bcopy (data, lh+1, len);
 1480 
 1481         if (debug) {
 1482                 log(LOG_DEBUG, SPP_FMT "%s output <%s id=0x%x len=%d",
 1483                     SPP_ARGS(ifp),
 1484                     sppp_proto_name(proto),
 1485                     sppp_cp_type_name (lh->type), lh->ident,
 1486                     ntohs (lh->len));
 1487                 sppp_print_bytes ((u_char*) (lh+1), len);
 1488                 log(-1, ">\n");
 1489         }
 1490         if (! IF_HANDOFF_ADJ(&sp->pp_cpq, m, ifp, 3))
 1491                 ifp->if_oerrors++;
 1492 }
 1493 
 1494 /*
 1495  * Handle incoming PPP control protocol packets.
 1496  */
 1497 static void
 1498 sppp_cp_input(const struct cp *cp, struct sppp *sp, struct mbuf *m)
 1499 {
 1500         STDDCL;
 1501         struct lcp_header *h;
 1502         int len = m->m_pkthdr.len;
 1503         int rv;
 1504         u_char *p;
 1505 
 1506         if (len < 4) {
 1507                 if (debug)
 1508                         log(LOG_DEBUG,
 1509                             SPP_FMT "%s invalid packet length: %d bytes\n",
 1510                             SPP_ARGS(ifp), cp->name, len);
 1511                 return;
 1512         }
 1513         h = mtod (m, struct lcp_header*);
 1514         if (debug) {
 1515                 log(LOG_DEBUG,
 1516                     SPP_FMT "%s input(%s): <%s id=0x%x len=%d",
 1517                     SPP_ARGS(ifp), cp->name,
 1518                     sppp_state_name(sp->state[cp->protoidx]),
 1519                     sppp_cp_type_name (h->type), h->ident, ntohs (h->len));
 1520                 sppp_print_bytes ((u_char*) (h+1), len-4);
 1521                 log(-1, ">\n");
 1522         }
 1523         if (len > ntohs (h->len))
 1524                 len = ntohs (h->len);
 1525         p = (u_char *)(h + 1);
 1526         switch (h->type) {
 1527         case CONF_REQ:
 1528                 if (len < 4) {
 1529                         if (debug)
 1530                                 log(-1, SPP_FMT "%s invalid conf-req length %d\n",
 1531                                        SPP_ARGS(ifp), cp->name,
 1532                                        len);
 1533                         ++ifp->if_ierrors;
 1534                         break;
 1535                 }
 1536                 /* handle states where RCR doesn't get a SCA/SCN */
 1537                 switch (sp->state[cp->protoidx]) {
 1538                 case STATE_CLOSING:
 1539                 case STATE_STOPPING:
 1540                         return;
 1541                 case STATE_CLOSED:
 1542                         sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident,
 1543                                      0, 0);
 1544                         return;
 1545                 }
 1546                 rv = (cp->RCR)(sp, h, len);
 1547                 switch (sp->state[cp->protoidx]) {
 1548                 case STATE_OPENED:
 1549                         (cp->tld)(sp);
 1550                         (cp->scr)(sp);
 1551                         /* FALLTHROUGH */
 1552                 case STATE_ACK_SENT:
 1553                 case STATE_REQ_SENT:
 1554                         /*
 1555                          * sppp_cp_change_state() have the side effect of
 1556                          * restarting the timeouts. We want to avoid that
 1557                          * if the state don't change, otherwise we won't
 1558                          * ever timeout and resend a configuration request
 1559                          * that got lost.
 1560                          */
 1561                         if (sp->state[cp->protoidx] == (rv ? STATE_ACK_SENT:
 1562                             STATE_REQ_SENT))
 1563                                 break;
 1564                         sppp_cp_change_state(cp, sp, rv?
 1565                                              STATE_ACK_SENT: STATE_REQ_SENT);
 1566                         break;
 1567                 case STATE_STOPPED:
 1568                         sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
 1569                         (cp->scr)(sp);
 1570                         sppp_cp_change_state(cp, sp, rv?
 1571                                              STATE_ACK_SENT: STATE_REQ_SENT);
 1572                         break;
 1573                 case STATE_ACK_RCVD:
 1574                         if (rv) {
 1575                                 sppp_cp_change_state(cp, sp, STATE_OPENED);
 1576                                 if (debug)
 1577                                         log(LOG_DEBUG, SPP_FMT "%s tlu\n",
 1578                                             SPP_ARGS(ifp),
 1579                                             cp->name);
 1580                                 (cp->tlu)(sp);
 1581                         } else
 1582                                 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD);
 1583                         break;
 1584                 default:
 1585                         printf(SPP_FMT "%s illegal %s in state %s\n",
 1586                                SPP_ARGS(ifp), cp->name,
 1587                                sppp_cp_type_name(h->type),
 1588                                sppp_state_name(sp->state[cp->protoidx]));
 1589                         ++ifp->if_ierrors;
 1590                 }
 1591                 break;
 1592         case CONF_ACK:
 1593                 if (h->ident != sp->confid[cp->protoidx]) {
 1594                         if (debug)
 1595                                 log(-1, SPP_FMT "%s id mismatch 0x%x != 0x%x\n",
 1596                                        SPP_ARGS(ifp), cp->name,
 1597                                        h->ident, sp->confid[cp->protoidx]);
 1598                         ++ifp->if_ierrors;
 1599                         break;
 1600                 }
 1601                 switch (sp->state[cp->protoidx]) {
 1602                 case STATE_CLOSED:
 1603                 case STATE_STOPPED:
 1604                         sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0);
 1605                         break;
 1606                 case STATE_CLOSING:
 1607                 case STATE_STOPPING:
 1608                         break;
 1609                 case STATE_REQ_SENT:
 1610                         sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
 1611                         sppp_cp_change_state(cp, sp, STATE_ACK_RCVD);
 1612                         break;
 1613                 case STATE_OPENED:
 1614                         (cp->tld)(sp);
 1615                         /* FALLTHROUGH */
 1616                 case STATE_ACK_RCVD:
 1617                         (cp->scr)(sp);
 1618                         sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
 1619                         break;
 1620                 case STATE_ACK_SENT:
 1621                         sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
 1622                         sppp_cp_change_state(cp, sp, STATE_OPENED);
 1623                         if (debug)
 1624                                 log(LOG_DEBUG, SPP_FMT "%s tlu\n",
 1625                                        SPP_ARGS(ifp), cp->name);
 1626                         (cp->tlu)(sp);
 1627                         break;
 1628                 default:
 1629                         printf(SPP_FMT "%s illegal %s in state %s\n",
 1630                                SPP_ARGS(ifp), cp->name,
 1631                                sppp_cp_type_name(h->type),
 1632                                sppp_state_name(sp->state[cp->protoidx]));
 1633                         ++ifp->if_ierrors;
 1634                 }
 1635                 break;
 1636         case CONF_NAK:
 1637         case CONF_REJ:
 1638                 if (h->ident != sp->confid[cp->protoidx]) {
 1639                         if (debug)
 1640                                 log(-1, SPP_FMT "%s id mismatch 0x%x != 0x%x\n",
 1641                                        SPP_ARGS(ifp), cp->name,
 1642                                        h->ident, sp->confid[cp->protoidx]);
 1643                         ++ifp->if_ierrors;
 1644                         break;
 1645                 }
 1646                 if (h->type == CONF_NAK)
 1647                         (cp->RCN_nak)(sp, h, len);
 1648                 else /* CONF_REJ */
 1649                         (cp->RCN_rej)(sp, h, len);
 1650 
 1651                 switch (sp->state[cp->protoidx]) {
 1652                 case STATE_CLOSED:
 1653                 case STATE_STOPPED:
 1654                         sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0);
 1655                         break;
 1656                 case STATE_REQ_SENT:
 1657                 case STATE_ACK_SENT:
 1658                         sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
 1659                         /*
 1660                          * Slow things down a bit if we think we might be
 1661                          * in loopback. Depend on the timeout to send the
 1662                          * next configuration request.
 1663                          */
 1664                         if (sp->pp_loopcnt)
 1665                                 break;
 1666                         (cp->scr)(sp);
 1667                         break;
 1668                 case STATE_OPENED:
 1669                         (cp->tld)(sp);
 1670                         /* FALLTHROUGH */
 1671                 case STATE_ACK_RCVD:
 1672                         sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
 1673                         (cp->scr)(sp);
 1674                         break;
 1675                 case STATE_CLOSING:
 1676                 case STATE_STOPPING:
 1677                         break;
 1678                 default:
 1679                         printf(SPP_FMT "%s illegal %s in state %s\n",
 1680                                SPP_ARGS(ifp), cp->name,
 1681                                sppp_cp_type_name(h->type),
 1682                                sppp_state_name(sp->state[cp->protoidx]));
 1683                         ++ifp->if_ierrors;
 1684                 }
 1685                 break;
 1686 
 1687         case TERM_REQ:
 1688                 switch (sp->state[cp->protoidx]) {
 1689                 case STATE_ACK_RCVD:
 1690                 case STATE_ACK_SENT:
 1691                         sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
 1692                         /* FALLTHROUGH */
 1693                 case STATE_CLOSED:
 1694                 case STATE_STOPPED:
 1695                 case STATE_CLOSING:
 1696                 case STATE_STOPPING:
 1697                 case STATE_REQ_SENT:
 1698                   sta:
 1699                         /* Send Terminate-Ack packet. */
 1700                         if (debug)
 1701                                 log(LOG_DEBUG, SPP_FMT "%s send terminate-ack\n",
 1702                                     SPP_ARGS(ifp), cp->name);
 1703                         sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0);
 1704                         break;
 1705                 case STATE_OPENED:
 1706                         (cp->tld)(sp);
 1707                         sp->rst_counter[cp->protoidx] = 0;
 1708                         sppp_cp_change_state(cp, sp, STATE_STOPPING);
 1709                         goto sta;
 1710                         break;
 1711                 default:
 1712                         printf(SPP_FMT "%s illegal %s in state %s\n",
 1713                                SPP_ARGS(ifp), cp->name,
 1714                                sppp_cp_type_name(h->type),
 1715                                sppp_state_name(sp->state[cp->protoidx]));
 1716                         ++ifp->if_ierrors;
 1717                 }
 1718                 break;
 1719         case TERM_ACK:
 1720                 switch (sp->state[cp->protoidx]) {
 1721                 case STATE_CLOSED:
 1722                 case STATE_STOPPED:
 1723                 case STATE_REQ_SENT:
 1724                 case STATE_ACK_SENT:
 1725                         break;
 1726                 case STATE_CLOSING:
 1727                         sppp_cp_change_state(cp, sp, STATE_CLOSED);
 1728                         (cp->tlf)(sp);
 1729                         break;
 1730                 case STATE_STOPPING:
 1731                         sppp_cp_change_state(cp, sp, STATE_STOPPED);
 1732                         (cp->tlf)(sp);
 1733                         break;
 1734                 case STATE_ACK_RCVD:
 1735                         sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
 1736                         break;
 1737                 case STATE_OPENED:
 1738                         (cp->tld)(sp);
 1739                         (cp->scr)(sp);
 1740                         sppp_cp_change_state(cp, sp, STATE_ACK_RCVD);
 1741                         break;
 1742                 default:
 1743                         printf(SPP_FMT "%s illegal %s in state %s\n",
 1744                                SPP_ARGS(ifp), cp->name,
 1745                                sppp_cp_type_name(h->type),
 1746                                sppp_state_name(sp->state[cp->protoidx]));
 1747                         ++ifp->if_ierrors;
 1748                 }
 1749                 break;
 1750         case CODE_REJ:
 1751                 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */
 1752                 log(LOG_INFO,
 1753                     SPP_FMT "%s: ignoring RXJ (%s) for proto 0x%x, "
 1754                     "danger will robinson\n",
 1755                     SPP_ARGS(ifp), cp->name,
 1756                     sppp_cp_type_name(h->type), ntohs(*((u_short *)p)));
 1757                 switch (sp->state[cp->protoidx]) {
 1758                 case STATE_CLOSED:
 1759                 case STATE_STOPPED:
 1760                 case STATE_REQ_SENT:
 1761                 case STATE_ACK_SENT:
 1762                 case STATE_CLOSING:
 1763                 case STATE_STOPPING:
 1764                 case STATE_OPENED:
 1765                         break;
 1766                 case STATE_ACK_RCVD:
 1767                         sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
 1768                         break;
 1769                 default:
 1770                         printf(SPP_FMT "%s illegal %s in state %s\n",
 1771                                SPP_ARGS(ifp), cp->name,
 1772                                sppp_cp_type_name(h->type),
 1773                                sppp_state_name(sp->state[cp->protoidx]));
 1774                         ++ifp->if_ierrors;
 1775                 }
 1776                 break;
 1777         case PROTO_REJ:
 1778             {
 1779                 int catastrophic;
 1780                 const struct cp *upper;
 1781                 int i;
 1782                 u_int16_t proto;
 1783 
 1784                 catastrophic = 0;
 1785                 upper = NULL;
 1786                 proto = ntohs(*((u_int16_t *)p));
 1787                 for (i = 0; i < IDX_COUNT; i++) {
 1788                         if (cps[i]->proto == proto) {
 1789                                 upper = cps[i];
 1790                                 break;
 1791                         }
 1792                 }
 1793                 if (upper == NULL)
 1794                         catastrophic++;
 1795 
 1796                 if (catastrophic || debug)
 1797                         log(catastrophic? LOG_INFO: LOG_DEBUG,
 1798                             SPP_FMT "%s: RXJ%c (%s) for proto 0x%x (%s/%s)\n",
 1799                             SPP_ARGS(ifp), cp->name, catastrophic ? '-' : '+',
 1800                             sppp_cp_type_name(h->type), proto,
 1801                             upper ? upper->name : "unknown",
 1802                             upper ? sppp_state_name(sp->state[upper->protoidx]) : "?");
 1803 
 1804                 /*
 1805                  * if we got RXJ+ against conf-req, the peer does not implement
 1806                  * this particular protocol type.  terminate the protocol.
 1807                  */
 1808                 if (upper && !catastrophic) {
 1809                         if (sp->state[upper->protoidx] == STATE_REQ_SENT) {
 1810                                 upper->Close(sp);
 1811                                 break;
 1812                         }
 1813                 }
 1814 
 1815                 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */
 1816                 switch (sp->state[cp->protoidx]) {
 1817                 case STATE_CLOSED:
 1818                 case STATE_STOPPED:
 1819                 case STATE_REQ_SENT:
 1820                 case STATE_ACK_SENT:
 1821                 case STATE_CLOSING:
 1822                 case STATE_STOPPING:
 1823                 case STATE_OPENED:
 1824                         break;
 1825                 case STATE_ACK_RCVD:
 1826                         sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
 1827                         break;
 1828                 default:
 1829                         printf(SPP_FMT "%s illegal %s in state %s\n",
 1830                                SPP_ARGS(ifp), cp->name,
 1831                                sppp_cp_type_name(h->type),
 1832                                sppp_state_name(sp->state[cp->protoidx]));
 1833                         ++ifp->if_ierrors;
 1834                 }
 1835                 break;
 1836             }
 1837         case DISC_REQ:
 1838                 if (cp->proto != PPP_LCP)
 1839                         goto illegal;
 1840                 /* Discard the packet. */
 1841                 break;
 1842         case ECHO_REQ:
 1843                 if (cp->proto != PPP_LCP)
 1844                         goto illegal;
 1845                 if (sp->state[cp->protoidx] != STATE_OPENED) {
 1846                         if (debug)
 1847                                 log(-1, SPP_FMT "lcp echo req but lcp closed\n",
 1848                                        SPP_ARGS(ifp));
 1849                         ++ifp->if_ierrors;
 1850                         break;
 1851                 }
 1852                 if (len < 8) {
 1853                         if (debug)
 1854                                 log(-1, SPP_FMT "invalid lcp echo request "
 1855                                        "packet length: %d bytes\n",
 1856                                        SPP_ARGS(ifp), len);
 1857                         break;
 1858                 }
 1859                 if ((sp->lcp.opts & (1 << LCP_OPT_MAGIC)) &&
 1860                     ntohl (*(long*)(h+1)) == sp->lcp.magic) {
 1861                         /* Line loopback mode detected. */
 1862                         printf(SPP_FMT "loopback\n", SPP_ARGS(ifp));
 1863                         sp->pp_loopcnt = MAXALIVECNT * 5;
 1864                         if_down (ifp);
 1865                         sppp_qflush (&sp->pp_cpq);
 1866 
 1867                         /* Shut down the PPP link. */
 1868                         /* XXX */
 1869                         lcp.Down(sp);
 1870                         lcp.Up(sp);
 1871                         break;
 1872                 }
 1873                 *(long*)(h+1) = htonl (sp->lcp.magic);
 1874                 if (debug)
 1875                         log(-1, SPP_FMT "got lcp echo req, sending echo rep\n",
 1876                                SPP_ARGS(ifp));
 1877                 sppp_cp_send (sp, PPP_LCP, ECHO_REPLY, h->ident, len-4, h+1);
 1878                 break;
 1879         case ECHO_REPLY:
 1880                 if (cp->proto != PPP_LCP)
 1881                         goto illegal;
 1882                 if (h->ident != sp->lcp.echoid) {
 1883                         ++ifp->if_ierrors;
 1884                         break;
 1885                 }
 1886                 if (len < 8) {
 1887                         if (debug)
 1888                                 log(-1, SPP_FMT "lcp invalid echo reply "
 1889                                        "packet length: %d bytes\n",
 1890                                        SPP_ARGS(ifp), len);
 1891                         break;
 1892                 }
 1893                 if (debug)
 1894                         log(-1, SPP_FMT "lcp got echo rep\n",
 1895                                SPP_ARGS(ifp));
 1896                 if (!(sp->lcp.opts & (1 << LCP_OPT_MAGIC)) ||
 1897                     ntohl (*(long*)(h+1)) != sp->lcp.magic)
 1898                         sp->pp_alivecnt = 0;
 1899                 break;
 1900         default:
 1901                 /* Unknown packet type -- send Code-Reject packet. */
 1902           illegal:
 1903                 if (debug)
 1904                         log(-1, SPP_FMT "%s send code-rej for 0x%x\n",
 1905                                SPP_ARGS(ifp), cp->name, h->type);
 1906                 sppp_cp_send(sp, cp->proto, CODE_REJ,
 1907                              ++sp->pp_seq[cp->protoidx], m->m_pkthdr.len, h);
 1908                 ++ifp->if_ierrors;
 1909         }
 1910 }
 1911 
 1912 
 1913 /*
 1914  * The generic part of all Up/Down/Open/Close/TO event handlers.
 1915  * Basically, the state transition handling in the automaton.
 1916  */
 1917 static void
 1918 sppp_up_event(const struct cp *cp, struct sppp *sp)
 1919 {
 1920         STDDCL;
 1921 
 1922         if (debug)
 1923                 log(LOG_DEBUG, SPP_FMT "%s up(%s)\n",
 1924                     SPP_ARGS(ifp), cp->name,
 1925                     sppp_state_name(sp->state[cp->protoidx]));
 1926 
 1927         switch (sp->state[cp->protoidx]) {
 1928         case STATE_INITIAL:
 1929                 sppp_cp_change_state(cp, sp, STATE_CLOSED);
 1930                 break;
 1931         case STATE_STARTING:
 1932                 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
 1933                 (cp->scr)(sp);
 1934                 sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
 1935                 break;
 1936         default:
 1937                 printf(SPP_FMT "%s illegal up in state %s\n",
 1938                        SPP_ARGS(ifp), cp->name,
 1939                        sppp_state_name(sp->state[cp->protoidx]));
 1940         }
 1941 }
 1942 
 1943 static void
 1944 sppp_down_event(const struct cp *cp, struct sppp *sp)
 1945 {
 1946         STDDCL;
 1947 
 1948         if (debug)
 1949                 log(LOG_DEBUG, SPP_FMT "%s down(%s)\n",
 1950                     SPP_ARGS(ifp), cp->name,
 1951                     sppp_state_name(sp->state[cp->protoidx]));
 1952 
 1953         switch (sp->state[cp->protoidx]) {
 1954         case STATE_CLOSED:
 1955         case STATE_CLOSING:
 1956                 sppp_cp_change_state(cp, sp, STATE_INITIAL);
 1957                 break;
 1958         case STATE_STOPPED:
 1959                 sppp_cp_change_state(cp, sp, STATE_STARTING);
 1960                 (cp->tls)(sp);
 1961                 break;
 1962         case STATE_STOPPING:
 1963         case STATE_REQ_SENT:
 1964         case STATE_ACK_RCVD:
 1965         case STATE_ACK_SENT:
 1966                 sppp_cp_change_state(cp, sp, STATE_STARTING);
 1967                 break;
 1968         case STATE_OPENED:
 1969                 (cp->tld)(sp);
 1970                 sppp_cp_change_state(cp, sp, STATE_STARTING);
 1971                 break;
 1972         default:
 1973                 printf(SPP_FMT "%s illegal down in state %s\n",
 1974                        SPP_ARGS(ifp), cp->name,
 1975                        sppp_state_name(sp->state[cp->protoidx]));
 1976         }
 1977 }
 1978 
 1979 
 1980 static void
 1981 sppp_open_event(const struct cp *cp, struct sppp *sp)
 1982 {
 1983         STDDCL;
 1984 
 1985         if (debug)
 1986                 log(LOG_DEBUG, SPP_FMT "%s open(%s)\n",
 1987                     SPP_ARGS(ifp), cp->name,
 1988                     sppp_state_name(sp->state[cp->protoidx]));
 1989 
 1990         switch (sp->state[cp->protoidx]) {
 1991         case STATE_INITIAL:
 1992                 sppp_cp_change_state(cp, sp, STATE_STARTING);
 1993                 (cp->tls)(sp);
 1994                 break;
 1995         case STATE_STARTING:
 1996                 break;
 1997         case STATE_CLOSED:
 1998                 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
 1999                 (cp->scr)(sp);
 2000                 sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
 2001                 break;
 2002         case STATE_STOPPED:
 2003                 /*
 2004                  * Try escaping stopped state.  This seems to bite
 2005                  * people occasionally, in particular for IPCP,
 2006                  * presumably following previous IPCP negotiation
 2007                  * aborts.  Somehow, we must have missed a Down event
 2008                  * which would have caused a transition into starting
 2009                  * state, so as a bandaid we force the Down event now.
 2010                  * This effectively implements (something like the)
 2011                  * `restart' option mentioned in the state transition
 2012                  * table of RFC 1661.
 2013                  */
 2014                 sppp_cp_change_state(cp, sp, STATE_STARTING);
 2015                 (cp->tls)(sp);
 2016                 break;
 2017         case STATE_STOPPING:
 2018         case STATE_REQ_SENT:
 2019         case STATE_ACK_RCVD:
 2020         case STATE_ACK_SENT:
 2021         case STATE_OPENED:
 2022                 break;
 2023         case STATE_CLOSING:
 2024                 sppp_cp_change_state(cp, sp, STATE_STOPPING);
 2025                 break;
 2026         }
 2027 }
 2028 
 2029 
 2030 static void
 2031 sppp_close_event(const struct cp *cp, struct sppp *sp)
 2032 {
 2033         STDDCL;
 2034 
 2035         if (debug)
 2036                 log(LOG_DEBUG, SPP_FMT "%s close(%s)\n",
 2037                     SPP_ARGS(ifp), cp->name,
 2038                     sppp_state_name(sp->state[cp->protoidx]));
 2039 
 2040         switch (sp->state[cp->protoidx]) {
 2041         case STATE_INITIAL:
 2042         case STATE_CLOSED:
 2043         case STATE_CLOSING:
 2044                 break;
 2045         case STATE_STARTING:
 2046                 sppp_cp_change_state(cp, sp, STATE_INITIAL);
 2047                 (cp->tlf)(sp);
 2048                 break;
 2049         case STATE_STOPPED:
 2050                 sppp_cp_change_state(cp, sp, STATE_CLOSED);
 2051                 break;
 2052         case STATE_STOPPING:
 2053                 sppp_cp_change_state(cp, sp, STATE_CLOSING);
 2054                 break;
 2055         case STATE_OPENED:
 2056                 (cp->tld)(sp);
 2057                 /* FALLTHROUGH */
 2058         case STATE_REQ_SENT:
 2059         case STATE_ACK_RCVD:
 2060         case STATE_ACK_SENT:
 2061                 sp->rst_counter[cp->protoidx] = sp->lcp.max_terminate;
 2062                 sppp_cp_send(sp, cp->proto, TERM_REQ,
 2063                              ++sp->pp_seq[cp->protoidx], 0, 0);
 2064                 sppp_cp_change_state(cp, sp, STATE_CLOSING);
 2065                 break;
 2066         }
 2067 }
 2068 
 2069 static void
 2070 sppp_to_event(const struct cp *cp, struct sppp *sp)
 2071 {
 2072         STDDCL;
 2073         int s;
 2074 
 2075         s = splimp();
 2076         SPPP_LOCK(sp);
 2077         if (debug)
 2078                 log(LOG_DEBUG, SPP_FMT "%s TO(%s) rst_counter = %d\n",
 2079                     SPP_ARGS(ifp), cp->name,
 2080                     sppp_state_name(sp->state[cp->protoidx]),
 2081                     sp->rst_counter[cp->protoidx]);
 2082 
 2083         if (--sp->rst_counter[cp->protoidx] < 0)
 2084                 /* TO- event */
 2085                 switch (sp->state[cp->protoidx]) {
 2086                 case STATE_CLOSING:
 2087                         sppp_cp_change_state(cp, sp, STATE_CLOSED);
 2088                         (cp->tlf)(sp);
 2089                         break;
 2090                 case STATE_STOPPING:
 2091                         sppp_cp_change_state(cp, sp, STATE_STOPPED);
 2092                         (cp->tlf)(sp);
 2093                         break;
 2094                 case STATE_REQ_SENT:
 2095                 case STATE_ACK_RCVD:
 2096                 case STATE_ACK_SENT:
 2097                         sppp_cp_change_state(cp, sp, STATE_STOPPED);
 2098                         (cp->tlf)(sp);
 2099                         break;
 2100                 }
 2101         else
 2102                 /* TO+ event */
 2103                 switch (sp->state[cp->protoidx]) {
 2104                 case STATE_CLOSING:
 2105                 case STATE_STOPPING:
 2106                         sppp_cp_send(sp, cp->proto, TERM_REQ,
 2107                                      ++sp->pp_seq[cp->protoidx], 0, 0);
 2108                         callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout,
 2109                                       cp->TO, (void *)sp);
 2110                         break;
 2111                 case STATE_REQ_SENT:
 2112                 case STATE_ACK_RCVD:
 2113                         (cp->scr)(sp);
 2114                         /* sppp_cp_change_state() will restart the timer */
 2115                         sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
 2116                         break;
 2117                 case STATE_ACK_SENT:
 2118                         (cp->scr)(sp);
 2119                         callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout,
 2120                                       cp->TO, (void *)sp);
 2121                         break;
 2122                 }
 2123 
 2124         SPPP_UNLOCK(sp);
 2125         splx(s);
 2126 }
 2127 
 2128 /*
 2129  * Change the state of a control protocol in the state automaton.
 2130  * Takes care of starting/stopping the restart timer.
 2131  */
 2132 static void
 2133 sppp_cp_change_state(const struct cp *cp, struct sppp *sp, int newstate)
 2134 {
 2135         sp->state[cp->protoidx] = newstate;
 2136 
 2137         callout_stop (&sp->ch[cp->protoidx]);
 2138 
 2139         switch (newstate) {
 2140         case STATE_INITIAL:
 2141         case STATE_STARTING:
 2142         case STATE_CLOSED:
 2143         case STATE_STOPPED:
 2144         case STATE_OPENED:
 2145                 break;
 2146         case STATE_CLOSING:
 2147         case STATE_STOPPING:
 2148         case STATE_REQ_SENT:
 2149         case STATE_ACK_RCVD:
 2150         case STATE_ACK_SENT:
 2151                 callout_reset(&sp->ch[cp->protoidx], sp->lcp.timeout,
 2152                               cp->TO, (void *)sp);
 2153                 break;
 2154         }
 2155 }
 2156 
 2157 /*
 2158  *--------------------------------------------------------------------------*
 2159  *                                                                          *
 2160  *                         The LCP implementation.                          *
 2161  *                                                                          *
 2162  *--------------------------------------------------------------------------*
 2163  */
 2164 static void
 2165 sppp_pp_up(struct sppp *sp)
 2166 {
 2167         SPPP_LOCK(sp);
 2168         lcp.Up(sp);
 2169         SPPP_UNLOCK(sp);
 2170 }
 2171 
 2172 static void
 2173 sppp_pp_down(struct sppp *sp)
 2174 {
 2175         SPPP_LOCK(sp);
 2176         lcp.Down(sp);
 2177         SPPP_UNLOCK(sp);
 2178 }
 2179 
 2180 static void
 2181 sppp_lcp_init(struct sppp *sp)
 2182 {
 2183         sp->lcp.opts = (1 << LCP_OPT_MAGIC);
 2184         sp->lcp.magic = 0;
 2185         sp->state[IDX_LCP] = STATE_INITIAL;
 2186         sp->fail_counter[IDX_LCP] = 0;
 2187         sp->pp_seq[IDX_LCP] = 0;
 2188         sp->pp_rseq[IDX_LCP] = 0;
 2189         sp->lcp.protos = 0;
 2190         sp->lcp.mru = sp->lcp.their_mru = PP_MTU;
 2191 
 2192         /* Note that these values are  relevant for all control protocols */
 2193         sp->lcp.timeout = 3 * hz;
 2194         sp->lcp.max_terminate = 2;
 2195         sp->lcp.max_configure = 10;
 2196         sp->lcp.max_failure = 10;
 2197         callout_init(&sp->ch[IDX_LCP], CALLOUT_MPSAFE);
 2198 }
 2199 
 2200 static void
 2201 sppp_lcp_up(struct sppp *sp)
 2202 {
 2203         STDDCL;
 2204 
 2205         sp->pp_alivecnt = 0;
 2206         sp->lcp.opts = (1 << LCP_OPT_MAGIC);
 2207         sp->lcp.magic = 0;
 2208         sp->lcp.protos = 0;
 2209         sp->lcp.mru = sp->lcp.their_mru = PP_MTU;
 2210         /*
 2211          * If we are authenticator, negotiate LCP_AUTH
 2212          */
 2213         if (sp->hisauth.proto != 0)
 2214                 sp->lcp.opts |= (1 << LCP_OPT_AUTH_PROTO);
 2215         else
 2216                 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO);
 2217         sp->pp_flags &= ~PP_NEEDAUTH;
 2218         /*
 2219          * If this interface is passive or dial-on-demand, and we are
 2220          * still in Initial state, it means we've got an incoming
 2221          * call.  Activate the interface.
 2222          */
 2223         if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) != 0) {
 2224                 if (debug)
 2225                         log(LOG_DEBUG,
 2226                             SPP_FMT "Up event", SPP_ARGS(ifp));
 2227                 ifp->if_drv_flags |= IFF_DRV_RUNNING;
 2228                 if (sp->state[IDX_LCP] == STATE_INITIAL) {
 2229                         if (debug)
 2230                                 log(-1, "(incoming call)\n");
 2231                         sp->pp_flags |= PP_CALLIN;
 2232                         lcp.Open(sp);
 2233                 } else if (debug)
 2234                         log(-1, "\n");
 2235         } else if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0 &&
 2236                    (sp->state[IDX_LCP] == STATE_INITIAL)) {
 2237                 ifp->if_drv_flags |= IFF_DRV_RUNNING;
 2238                 lcp.Open(sp);
 2239         }
 2240 
 2241         sppp_up_event(&lcp, sp);
 2242 }
 2243 
 2244 static void
 2245 sppp_lcp_down(struct sppp *sp)
 2246 {
 2247         STDDCL;
 2248 
 2249         sppp_down_event(&lcp, sp);
 2250 
 2251         /*
 2252          * If this is neither a dial-on-demand nor a passive
 2253          * interface, simulate an ``ifconfig down'' action, so the
 2254          * administrator can force a redial by another ``ifconfig
 2255          * up''.  XXX For leased line operation, should we immediately
 2256          * try to reopen the connection here?
 2257          */
 2258         if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0) {
 2259                 log(LOG_INFO,
 2260                     SPP_FMT "Down event, taking interface down.\n",
 2261                     SPP_ARGS(ifp));
 2262                 if_down(ifp);
 2263         } else {
 2264                 if (debug)
 2265                         log(LOG_DEBUG,
 2266                             SPP_FMT "Down event (carrier loss)\n",
 2267                             SPP_ARGS(ifp));
 2268                 sp->pp_flags &= ~PP_CALLIN;
 2269                 if (sp->state[IDX_LCP] != STATE_INITIAL)
 2270                         lcp.Close(sp);
 2271                 ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
 2272         }
 2273 }
 2274 
 2275 static void
 2276 sppp_lcp_open(struct sppp *sp)
 2277 {
 2278         sppp_open_event(&lcp, sp);
 2279 }
 2280 
 2281 static void
 2282 sppp_lcp_close(struct sppp *sp)
 2283 {
 2284         sppp_close_event(&lcp, sp);
 2285 }
 2286 
 2287 static void
 2288 sppp_lcp_TO(void *cookie)
 2289 {
 2290         sppp_to_event(&lcp, (struct sppp *)cookie);
 2291 }
 2292 
 2293 /*
 2294  * Analyze a configure request.  Return true if it was agreeable, and
 2295  * caused action sca, false if it has been rejected or nak'ed, and
 2296  * caused action scn.  (The return value is used to make the state
 2297  * transition decision in the state automaton.)
 2298  */
 2299 static int
 2300 sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len)
 2301 {
 2302         STDDCL;
 2303         u_char *buf, *r, *p;
 2304         int origlen, rlen;
 2305         u_long nmagic;
 2306         u_short authproto;
 2307 
 2308         len -= 4;
 2309         origlen = len;
 2310         buf = r = malloc (len, M_TEMP, M_NOWAIT);
 2311         if (! buf)
 2312                 return (0);
 2313 
 2314         if (debug)
 2315                 log(LOG_DEBUG, SPP_FMT "lcp parse opts: ",
 2316                     SPP_ARGS(ifp));
 2317 
 2318         /* pass 1: check for things that need to be rejected */
 2319         p = (void*) (h+1);
 2320         for (rlen=0; len >= 2 && p[1] >= 2 && len >= p[1];
 2321             len-=p[1], p+=p[1]) {
 2322                 if (debug)
 2323                         log(-1, " %s ", sppp_lcp_opt_name(*p));
 2324                 switch (*p) {
 2325                 case LCP_OPT_MAGIC:
 2326                         /* Magic number. */
 2327                         if (len >= 6 && p[1] == 6)
 2328                                 continue;
 2329                         if (debug)
 2330                                 log(-1, "[invalid] ");
 2331                         break;
 2332                 case LCP_OPT_ASYNC_MAP:
 2333                         /* Async control character map. */
 2334                         if (len >= 6 && p[1] == 6)
 2335                                 continue;
 2336                         if (debug)
 2337                                 log(-1, "[invalid] ");
 2338                         break;
 2339                 case LCP_OPT_MRU:
 2340                         /* Maximum receive unit. */
 2341                         if (len >= 4 && p[1] == 4)
 2342                                 continue;
 2343                         if (debug)
 2344                                 log(-1, "[invalid] ");
 2345                         break;
 2346                 case LCP_OPT_AUTH_PROTO:
 2347                         if (len < 4) {
 2348                                 if (debug)
 2349                                         log(-1, "[invalid] ");
 2350                                 break;
 2351                         }
 2352                         authproto = (p[2] << 8) + p[3];
 2353                         if (authproto == PPP_CHAP && p[1] != 5) {
 2354                                 if (debug)
 2355                                         log(-1, "[invalid chap len] ");
 2356                                 break;
 2357                         }
 2358                         if (sp->myauth.proto == 0) {
 2359                                 /* we are not configured to do auth */
 2360                                 if (debug)
 2361                                         log(-1, "[not configured] ");
 2362                                 break;
 2363                         }
 2364                         /*
 2365                          * Remote want us to authenticate, remember this,
 2366                          * so we stay in PHASE_AUTHENTICATE after LCP got
 2367                          * up.
 2368                          */
 2369                         sp->pp_flags |= PP_NEEDAUTH;
 2370                         continue;
 2371                 default:
 2372                         /* Others not supported. */
 2373                         if (debug)
 2374                                 log(-1, "[rej] ");
 2375                         break;
 2376                 }
 2377                 /* Add the option to rejected list. */
 2378                 bcopy (p, r, p[1]);
 2379                 r += p[1];
 2380                 rlen += p[1];
 2381         }
 2382         if (rlen) {
 2383                 if (debug)
 2384                         log(-1, " send conf-rej\n");
 2385                 sppp_cp_send (sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf);
 2386                 return 0;
 2387         } else if (debug)
 2388                 log(-1, "\n");
 2389 
 2390         /*
 2391          * pass 2: check for option values that are unacceptable and
 2392          * thus require to be nak'ed.
 2393          */
 2394         if (debug)
 2395                 log(LOG_DEBUG, SPP_FMT "lcp parse opt values: ",
 2396                     SPP_ARGS(ifp));
 2397 
 2398         p = (void*) (h+1);
 2399         len = origlen;
 2400         for (rlen=0; len >= 2 && p[1] >= 2 && len >= p[1];
 2401             len-=p[1], p+=p[1]) {
 2402                 if (debug)
 2403                         log(-1, " %s ", sppp_lcp_opt_name(*p));
 2404                 switch (*p) {
 2405                 case LCP_OPT_MAGIC:
 2406                         /* Magic number -- extract. */
 2407                         nmagic = (u_long)p[2] << 24 |
 2408                                 (u_long)p[3] << 16 | p[4] << 8 | p[5];
 2409                         if (nmagic != sp->lcp.magic) {
 2410                                 sp->pp_loopcnt = 0;
 2411                                 if (debug)
 2412                                         log(-1, "0x%lx ", nmagic);
 2413                                 continue;
 2414                         }
 2415                         if (debug && sp->pp_loopcnt < MAXALIVECNT*5)
 2416                                 log(-1, "[glitch] ");
 2417                         ++sp->pp_loopcnt;
 2418                         /*
 2419                          * We negate our magic here, and NAK it.  If
 2420                          * we see it later in an NAK packet, we
 2421                          * suggest a new one.
 2422                          */
 2423                         nmagic = ~sp->lcp.magic;
 2424                         /* Gonna NAK it. */
 2425                         p[2] = nmagic >> 24;
 2426                         p[3] = nmagic >> 16;
 2427                         p[4] = nmagic >> 8;
 2428                         p[5] = nmagic;
 2429                         break;
 2430 
 2431                 case LCP_OPT_ASYNC_MAP:
 2432                         /*
 2433                          * Async control character map -- just ignore it.
 2434                          *
 2435                          * Quote from RFC 1662, chapter 6:
 2436                          * To enable this functionality, synchronous PPP
 2437                          * implementations MUST always respond to the
 2438                          * Async-Control-Character-Map Configuration
 2439                          * Option with the LCP Configure-Ack.  However,
 2440                          * acceptance of the Configuration Option does
 2441                          * not imply that the synchronous implementation
 2442                          * will do any ACCM mapping.  Instead, all such
 2443                          * octet mapping will be performed by the
 2444                          * asynchronous-to-synchronous converter.
 2445                          */
 2446                         continue;
 2447 
 2448                 case LCP_OPT_MRU:
 2449                         /*
 2450                          * Maximum receive unit.  Always agreeable,
 2451                          * but ignored by now.
 2452                          */
 2453                         sp->lcp.their_mru = p[2] * 256 + p[3];
 2454                         if (debug)
 2455                                 log(-1, "%lu ", sp->lcp.their_mru);
 2456                         continue;
 2457 
 2458                 case LCP_OPT_AUTH_PROTO:
 2459                         authproto = (p[2] << 8) + p[3];
 2460                         if (sp->myauth.proto != authproto) {
 2461                                 /* not agreed, nak */
 2462                                 if (debug)
 2463                                         log(-1, "[mine %s != his %s] ",
 2464                                                sppp_proto_name(sp->hisauth.proto),
 2465                                                sppp_proto_name(authproto));
 2466                                 p[2] = sp->myauth.proto >> 8;
 2467                                 p[3] = sp->myauth.proto;
 2468                                 break;
 2469                         }
 2470                         if (authproto == PPP_CHAP && p[4] != CHAP_MD5) {
 2471                                 if (debug)
 2472                                         log(-1, "[chap not MD5] ");
 2473                                 p[4] = CHAP_MD5;
 2474                                 break;
 2475                         }
 2476                         continue;
 2477                 }
 2478                 /* Add the option to nak'ed list. */
 2479                 bcopy (p, r, p[1]);
 2480                 r += p[1];
 2481                 rlen += p[1];
 2482         }
 2483         if (rlen) {
 2484                 /*
 2485                  * Local and remote magics equal -- loopback?
 2486                  */
 2487                 if (sp->pp_loopcnt >= MAXALIVECNT*5) {
 2488                         if (sp->pp_loopcnt == MAXALIVECNT*5)
 2489                                 printf (SPP_FMT "loopback\n",
 2490                                         SPP_ARGS(ifp));
 2491                         if (ifp->if_flags & IFF_UP) {
 2492                                 if_down(ifp);
 2493                                 sppp_qflush(&sp->pp_cpq);
 2494                                 /* XXX ? */
 2495                                 lcp.Down(sp);
 2496                                 lcp.Up(sp);
 2497                         }
 2498                 } else if (!sp->pp_loopcnt &&
 2499                            ++sp->fail_counter[IDX_LCP] >= sp->lcp.max_failure) {
 2500                         if (debug)
 2501                                 log(-1, " max_failure (%d) exceeded, "
 2502                                        "send conf-rej\n",
 2503                                        sp->lcp.max_failure);
 2504                         sppp_cp_send(sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf);
 2505                 } else {
 2506                         if (debug)
 2507                                 log(-1, " send conf-nak\n");
 2508                         sppp_cp_send (sp, PPP_LCP, CONF_NAK, h->ident, rlen, buf);
 2509                 }
 2510         } else {
 2511                 if (debug)
 2512                         log(-1, " send conf-ack\n");
 2513                 sp->fail_counter[IDX_LCP] = 0;
 2514                 sp->pp_loopcnt = 0;
 2515                 sppp_cp_send (sp, PPP_LCP, CONF_ACK,
 2516                               h->ident, origlen, h+1);
 2517         }
 2518 
 2519         free (buf, M_TEMP);
 2520         return (rlen == 0);
 2521 }
 2522 
 2523 /*
 2524  * Analyze the LCP Configure-Reject option list, and adjust our
 2525  * negotiation.
 2526  */
 2527 static void
 2528 sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len)
 2529 {
 2530         STDDCL;
 2531         u_char *buf, *p;
 2532 
 2533         len -= 4;
 2534         buf = malloc (len, M_TEMP, M_NOWAIT);
 2535         if (!buf)
 2536                 return;
 2537 
 2538         if (debug)
 2539                 log(LOG_DEBUG, SPP_FMT "lcp rej opts: ",
 2540                     SPP_ARGS(ifp));
 2541 
 2542         p = (void*) (h+1);
 2543         for (; len >= 2 && p[1] >= 2 && len >= p[1];
 2544             len -= p[1], p += p[1]) {
 2545                 if (debug)
 2546                         log(-1, " %s ", sppp_lcp_opt_name(*p));
 2547                 switch (*p) {
 2548                 case LCP_OPT_MAGIC:
 2549                         /* Magic number -- can't use it, use 0 */
 2550                         sp->lcp.opts &= ~(1 << LCP_OPT_MAGIC);
 2551                         sp->lcp.magic = 0;
 2552                         break;
 2553                 case LCP_OPT_MRU:
 2554                         /*
 2555                          * Should not be rejected anyway, since we only
 2556                          * negotiate a MRU if explicitly requested by
 2557                          * peer.
 2558                          */
 2559                         sp->lcp.opts &= ~(1 << LCP_OPT_MRU);
 2560                         break;
 2561                 case LCP_OPT_AUTH_PROTO:
 2562                         /*
 2563                          * Peer doesn't want to authenticate himself,
 2564                          * deny unless this is a dialout call, and
 2565                          * AUTHFLAG_NOCALLOUT is set.
 2566                          */
 2567                         if ((sp->pp_flags & PP_CALLIN) == 0 &&
 2568                             (sp->hisauth.flags & AUTHFLAG_NOCALLOUT) != 0) {
 2569                                 if (debug)
 2570                                         log(-1, "[don't insist on auth "
 2571                                                "for callout]");
 2572                                 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO);
 2573                                 break;
 2574                         }
 2575                         if (debug)
 2576                                 log(-1, "[access denied]\n");
 2577                         lcp.Close(sp);
 2578                         break;
 2579                 }
 2580         }
 2581         if (debug)
 2582                 log(-1, "\n");
 2583         free (buf, M_TEMP);
 2584         return;
 2585 }
 2586 
 2587 /*
 2588  * Analyze the LCP Configure-NAK option list, and adjust our
 2589  * negotiation.
 2590  */
 2591 static void
 2592 sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len)
 2593 {
 2594         STDDCL;
 2595         u_char *buf, *p;
 2596         u_long magic;
 2597 
 2598         len -= 4;
 2599         buf = malloc (len, M_TEMP, M_NOWAIT);
 2600         if (!buf)
 2601                 return;
 2602 
 2603         if (debug)
 2604                 log(LOG_DEBUG, SPP_FMT "lcp nak opts: ",
 2605                     SPP_ARGS(ifp));
 2606 
 2607         p = (void*) (h+1);
 2608         for (; len >= 2 && p[1] >= 2 && len >= p[1];
 2609             len -= p[1], p += p[1]) {
 2610                 if (debug)
 2611                         log(-1, " %s ", sppp_lcp_opt_name(*p));
 2612                 switch (*p) {
 2613                 case LCP_OPT_MAGIC:
 2614                         /* Magic number -- renegotiate */
 2615                         if ((sp->lcp.opts & (1 << LCP_OPT_MAGIC)) &&
 2616                             len >= 6 && p[1] == 6) {
 2617                                 magic = (u_long)p[2] << 24 |
 2618                                         (u_long)p[3] << 16 | p[4] << 8 | p[5];
 2619                                 /*
 2620                                  * If the remote magic is our negated one,
 2621                                  * this looks like a loopback problem.
 2622                                  * Suggest a new magic to make sure.
 2623                                  */
 2624                                 if (magic == ~sp->lcp.magic) {
 2625                                         if (debug)
 2626                                                 log(-1, "magic glitch ");
 2627                                         sp->lcp.magic = random();
 2628                                 } else {
 2629                                         sp->lcp.magic = magic;
 2630                                         if (debug)
 2631                                                 log(-1, "%lu ", magic);
 2632                                 }
 2633                         }
 2634                         break;
 2635                 case LCP_OPT_MRU:
 2636                         /*
 2637                          * Peer wants to advise us to negotiate an MRU.
 2638                          * Agree on it if it's reasonable, or use
 2639                          * default otherwise.
 2640                          */
 2641                         if (len >= 4 && p[1] == 4) {
 2642                                 u_int mru = p[2] * 256 + p[3];
 2643                                 if (debug)
 2644                                         log(-1, "%d ", mru);
 2645                                 if (mru < PP_MTU || mru > PP_MAX_MRU)
 2646                                         mru = PP_MTU;
 2647                                 sp->lcp.mru = mru;
 2648                                 sp->lcp.opts |= (1 << LCP_OPT_MRU);
 2649                         }
 2650                         break;
 2651                 case LCP_OPT_AUTH_PROTO:
 2652                         /*
 2653                          * Peer doesn't like our authentication method,
 2654                          * deny.
 2655                          */
 2656                         if (debug)
 2657                                 log(-1, "[access denied]\n");
 2658                         lcp.Close(sp);
 2659                         break;
 2660                 }
 2661         }
 2662         if (debug)
 2663                 log(-1, "\n");
 2664         free (buf, M_TEMP);
 2665         return;
 2666 }
 2667 
 2668 static void
 2669 sppp_lcp_tlu(struct sppp *sp)
 2670 {
 2671         STDDCL;
 2672         int i;
 2673         u_long mask;
 2674 
 2675         /* XXX ? */
 2676         if (! (ifp->if_flags & IFF_UP) &&
 2677             (ifp->if_drv_flags & IFF_DRV_RUNNING)) {
 2678                 /* Coming out of loopback mode. */
 2679                 if_up(ifp);
 2680                 printf (SPP_FMT "up\n", SPP_ARGS(ifp));
 2681         }
 2682 
 2683         for (i = 0; i < IDX_COUNT; i++)
 2684                 if ((cps[i])->flags & CP_QUAL)
 2685                         (cps[i])->Open(sp);
 2686 
 2687         if ((sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0 ||
 2688             (sp->pp_flags & PP_NEEDAUTH) != 0)
 2689                 sp->pp_phase = PHASE_AUTHENTICATE;
 2690         else
 2691                 sp->pp_phase = PHASE_NETWORK;
 2692 
 2693         if (debug)
 2694                 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp),
 2695                     sppp_phase_name(sp->pp_phase));
 2696 
 2697         /*
 2698          * Open all authentication protocols.  This is even required
 2699          * if we already proceeded to network phase, since it might be
 2700          * that remote wants us to authenticate, so we might have to
 2701          * send a PAP request.  Undesired authentication protocols
 2702          * don't do anything when they get an Open event.
 2703          */
 2704         for (i = 0; i < IDX_COUNT; i++)
 2705                 if ((cps[i])->flags & CP_AUTH)
 2706                         (cps[i])->Open(sp);
 2707 
 2708         if (sp->pp_phase == PHASE_NETWORK) {
 2709                 /* Notify all NCPs. */
 2710                 for (i = 0; i < IDX_COUNT; i++)
 2711                         if (((cps[i])->flags & CP_NCP) &&
 2712                             /*
 2713                              * XXX
 2714                              * Hack to administratively disable IPv6 if
 2715                              * not desired.  Perhaps we should have another
 2716                              * flag for this, but right now, we can make
 2717                              * all struct cp's read/only.
 2718                              */
 2719                             (cps[i] != &ipv6cp ||
 2720                              (sp->confflags & CONF_ENABLE_IPV6)))
 2721                                 (cps[i])->Open(sp);
 2722         }
 2723 
 2724         /* Send Up events to all started protos. */
 2725         for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1)
 2726                 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_LCP) == 0)
 2727                         (cps[i])->Up(sp);
 2728 
 2729         /* notify low-level driver of state change */
 2730         if (sp->pp_chg)
 2731                 sp->pp_chg(sp, (int)sp->pp_phase);
 2732         
 2733         if (sp->pp_phase == PHASE_NETWORK)
 2734                 /* if no NCP is starting, close down */
 2735                 sppp_lcp_check_and_close(sp);
 2736 }
 2737 
 2738 static void
 2739 sppp_lcp_tld(struct sppp *sp)
 2740 {
 2741         STDDCL;
 2742         int i;
 2743         u_long mask;
 2744 
 2745         sp->pp_phase = PHASE_TERMINATE;
 2746 
 2747         if (debug)
 2748                 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp),
 2749                     sppp_phase_name(sp->pp_phase));
 2750 
 2751         /*
 2752          * Take upper layers down.  We send the Down event first and
 2753          * the Close second to prevent the upper layers from sending
 2754          * ``a flurry of terminate-request packets'', as the RFC
 2755          * describes it.
 2756          */
 2757         for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1)
 2758                 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_LCP) == 0) {
 2759                         (cps[i])->Down(sp);
 2760                         (cps[i])->Close(sp);
 2761                 }
 2762 }
 2763 
 2764 static void
 2765 sppp_lcp_tls(struct sppp *sp)
 2766 {
 2767         STDDCL;
 2768 
 2769         sp->pp_phase = PHASE_ESTABLISH;
 2770 
 2771         if (debug)
 2772                 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp),
 2773                     sppp_phase_name(sp->pp_phase));
 2774 
 2775         /* Notify lower layer if desired. */
 2776         if (sp->pp_tls)
 2777                 (sp->pp_tls)(sp);
 2778         else
 2779                 (sp->pp_up)(sp);
 2780 }
 2781 
 2782 static void
 2783 sppp_lcp_tlf(struct sppp *sp)
 2784 {
 2785         STDDCL;
 2786 
 2787         sp->pp_phase = PHASE_DEAD;
 2788         if (debug)
 2789                 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp),
 2790                     sppp_phase_name(sp->pp_phase));
 2791 
 2792         /* Notify lower layer if desired. */
 2793         if (sp->pp_tlf)
 2794                 (sp->pp_tlf)(sp);
 2795         else
 2796                 (sp->pp_down)(sp);
 2797 }
 2798 
 2799 static void
 2800 sppp_lcp_scr(struct sppp *sp)
 2801 {
 2802         char opt[6 /* magicnum */ + 4 /* mru */ + 5 /* chap */];
 2803         int i = 0;
 2804         u_short authproto;
 2805 
 2806         if (sp->lcp.opts & (1 << LCP_OPT_MAGIC)) {
 2807                 if (! sp->lcp.magic)
 2808                         sp->lcp.magic = random();
 2809                 opt[i++] = LCP_OPT_MAGIC;
 2810                 opt[i++] = 6;
 2811                 opt[i++] = sp->lcp.magic >> 24;
 2812                 opt[i++] = sp->lcp.magic >> 16;
 2813                 opt[i++] = sp->lcp.magic >> 8;
 2814                 opt[i++] = sp->lcp.magic;
 2815         }
 2816 
 2817         if (sp->lcp.opts & (1 << LCP_OPT_MRU)) {
 2818                 opt[i++] = LCP_OPT_MRU;
 2819                 opt[i++] = 4;
 2820                 opt[i++] = sp->lcp.mru >> 8;
 2821                 opt[i++] = sp->lcp.mru;
 2822         }
 2823 
 2824         if (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) {
 2825                 authproto = sp->hisauth.proto;
 2826                 opt[i++] = LCP_OPT_AUTH_PROTO;
 2827                 opt[i++] = authproto == PPP_CHAP? 5: 4;
 2828                 opt[i++] = authproto >> 8;
 2829                 opt[i++] = authproto;
 2830                 if (authproto == PPP_CHAP)
 2831                         opt[i++] = CHAP_MD5;
 2832         }
 2833 
 2834         sp->confid[IDX_LCP] = ++sp->pp_seq[IDX_LCP];
 2835         sppp_cp_send (sp, PPP_LCP, CONF_REQ, sp->confid[IDX_LCP], i, &opt);
 2836 }
 2837 
 2838 /*
 2839  * Check the open NCPs, return true if at least one NCP is open.
 2840  */
 2841 static int
 2842 sppp_ncp_check(struct sppp *sp)
 2843 {
 2844         int i, mask;
 2845 
 2846         for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1)
 2847                 if ((sp->lcp.protos & mask) && (cps[i])->flags & CP_NCP)
 2848                         return 1;
 2849         return 0;
 2850 }
 2851 
 2852 /*
 2853  * Re-check the open NCPs and see if we should terminate the link.
 2854  * Called by the NCPs during their tlf action handling.
 2855  */
 2856 static void
 2857 sppp_lcp_check_and_close(struct sppp *sp)
 2858 {
 2859 
 2860         if (sp->pp_phase < PHASE_NETWORK)
 2861                 /* don't bother, we are already going down */
 2862                 return;
 2863 
 2864         if (sppp_ncp_check(sp))
 2865                 return;
 2866 
 2867         lcp.Close(sp);
 2868 }
 2869 
 2870 /*
 2871  *--------------------------------------------------------------------------*
 2872  *                                                                          *
 2873  *                        The IPCP implementation.                          *
 2874  *                                                                          *
 2875  *--------------------------------------------------------------------------*
 2876  */
 2877 
 2878 #ifdef INET
 2879 static void
 2880 sppp_ipcp_init(struct sppp *sp)
 2881 {
 2882         sp->ipcp.opts = 0;
 2883         sp->ipcp.flags = 0;
 2884         sp->state[IDX_IPCP] = STATE_INITIAL;
 2885         sp->fail_counter[IDX_IPCP] = 0;
 2886         sp->pp_seq[IDX_IPCP] = 0;
 2887         sp->pp_rseq[IDX_IPCP] = 0;
 2888         callout_init(&sp->ch[IDX_IPCP], CALLOUT_MPSAFE);
 2889 }
 2890 
 2891 static void
 2892 sppp_ipcp_up(struct sppp *sp)
 2893 {
 2894         sppp_up_event(&ipcp, sp);
 2895 }
 2896 
 2897 static void
 2898 sppp_ipcp_down(struct sppp *sp)
 2899 {
 2900         sppp_down_event(&ipcp, sp);
 2901 }
 2902 
 2903 static void
 2904 sppp_ipcp_open(struct sppp *sp)
 2905 {
 2906         STDDCL;
 2907         u_long myaddr, hisaddr;
 2908 
 2909         sp->ipcp.flags &= ~(IPCP_HISADDR_SEEN | IPCP_MYADDR_SEEN |
 2910                             IPCP_MYADDR_DYN | IPCP_VJ);
 2911         sp->ipcp.opts = 0;
 2912 
 2913         sppp_get_ip_addrs(sp, &myaddr, &hisaddr, 0);
 2914         /*
 2915          * If we don't have his address, this probably means our
 2916          * interface doesn't want to talk IP at all.  (This could
 2917          * be the case if somebody wants to speak only IPX, for
 2918          * example.)  Don't open IPCP in this case.
 2919          */
 2920         if (hisaddr == 0L) {
 2921                 /* XXX this message should go away */
 2922                 if (debug)
 2923                         log(LOG_DEBUG, SPP_FMT "ipcp_open(): no IP interface\n",
 2924                             SPP_ARGS(ifp));
 2925                 return;
 2926         }
 2927         if (myaddr == 0L) {
 2928                 /*
 2929                  * I don't have an assigned address, so i need to
 2930                  * negotiate my address.
 2931                  */
 2932                 sp->ipcp.flags |= IPCP_MYADDR_DYN;
 2933                 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS);
 2934         } else
 2935                 sp->ipcp.flags |= IPCP_MYADDR_SEEN;
 2936         if (sp->confflags & CONF_ENABLE_VJ) {
 2937                 sp->ipcp.opts |= (1 << IPCP_OPT_COMPRESSION);
 2938                 sp->ipcp.max_state = MAX_STATES - 1;
 2939                 sp->ipcp.compress_cid = 1;
 2940         }
 2941         sppp_open_event(&ipcp, sp);
 2942 }
 2943 
 2944 static void
 2945 sppp_ipcp_close(struct sppp *sp)
 2946 {
 2947         sppp_close_event(&ipcp, sp);
 2948         if (sp->ipcp.flags & IPCP_MYADDR_DYN)
 2949                 /*
 2950                  * My address was dynamic, clear it again.
 2951                  */
 2952                 sppp_set_ip_addr(sp, 0L);
 2953 }
 2954 
 2955 static void
 2956 sppp_ipcp_TO(void *cookie)
 2957 {
 2958         sppp_to_event(&ipcp, (struct sppp *)cookie);
 2959 }
 2960 
 2961 /*
 2962  * Analyze a configure request.  Return true if it was agreeable, and
 2963  * caused action sca, false if it has been rejected or nak'ed, and
 2964  * caused action scn.  (The return value is used to make the state
 2965  * transition decision in the state automaton.)
 2966  */
 2967 static int
 2968 sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len)
 2969 {
 2970         u_char *buf, *r, *p;
 2971         struct ifnet *ifp = SP2IFP(sp);
 2972         int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG;
 2973         u_long hisaddr, desiredaddr;
 2974         int gotmyaddr = 0;
 2975         int desiredcomp;
 2976 
 2977         len -= 4;
 2978         origlen = len;
 2979         /*
 2980          * Make sure to allocate a buf that can at least hold a
 2981          * conf-nak with an `address' option.  We might need it below.
 2982          */
 2983         buf = r = malloc ((len < 6? 6: len), M_TEMP, M_NOWAIT);
 2984         if (! buf)
 2985                 return (0);
 2986 
 2987         /* pass 1: see if we can recognize them */
 2988         if (debug)
 2989                 log(LOG_DEBUG, SPP_FMT "ipcp parse opts: ",
 2990                     SPP_ARGS(ifp));
 2991         p = (void*) (h+1);
 2992         for (rlen=0; len >= 2 && p[1] >= 2 && len >= p[1];
 2993             len-=p[1], p+=p[1]) {
 2994                 if (debug)
 2995                         log(-1, " %s ", sppp_ipcp_opt_name(*p));
 2996                 switch (*p) {
 2997                 case IPCP_OPT_COMPRESSION:
 2998                         if (!(sp->confflags & CONF_ENABLE_VJ)) {
 2999                                 /* VJ compression administratively disabled */
 3000                                 if (debug)
 3001                                         log(-1, "[locally disabled] ");
 3002                                 break;
 3003                         }
 3004                         /*
 3005                          * In theory, we should only conf-rej an
 3006                          * option that is shorter than RFC 1618
 3007                          * requires (i.e. < 4), and should conf-nak
 3008                          * anything else that is not VJ.  However,
 3009                          * since our algorithm always uses the
 3010                          * original option to NAK it with new values,
 3011                          * things would become more complicated.  In
 3012                          * pratice, the only commonly implemented IP
 3013                          * compression option is VJ anyway, so the
 3014                          * difference is negligible.
 3015                          */
 3016                         if (len >= 6 && p[1] == 6) {
 3017                                 /*
 3018                                  * correctly formed compression option
 3019                                  * that could be VJ compression
 3020                                  */
 3021                                 continue;
 3022                         }
 3023                         if (debug)
 3024                                 log(-1,
 3025                                     "optlen %d [invalid/unsupported] ",
 3026                                     p[1]);
 3027                         break;
 3028                 case IPCP_OPT_ADDRESS:
 3029                         if (len >= 6 && p[1] == 6) {
 3030                                 /* correctly formed address option */
 3031                                 continue;
 3032                         }
 3033                         if (debug)
 3034                                 log(-1, "[invalid] ");
 3035                         break;
 3036                 default:
 3037                         /* Others not supported. */
 3038                         if (debug)
 3039                                 log(-1, "[rej] ");
 3040                         break;
 3041                 }
 3042                 /* Add the option to rejected list. */
 3043                 bcopy (p, r, p[1]);
 3044                 r += p[1];
 3045                 rlen += p[1];
 3046         }
 3047         if (rlen) {
 3048                 if (debug)
 3049                         log(-1, " send conf-rej\n");
 3050                 sppp_cp_send (sp, PPP_IPCP, CONF_REJ, h->ident, rlen, buf);
 3051                 return 0;
 3052         } else if (debug)
 3053                 log(-1, "\n");
 3054 
 3055         /* pass 2: parse option values */
 3056         sppp_get_ip_addrs(sp, 0, &hisaddr, 0);
 3057         if (debug)
 3058                 log(LOG_DEBUG, SPP_FMT "ipcp parse opt values: ",
 3059                        SPP_ARGS(ifp));
 3060         p = (void*) (h+1);
 3061         len = origlen;
 3062         for (rlen=0; len >= 2 && p[1] >= 2 && len >= p[1];
 3063             len-=p[1], p+=p[1]) {
 3064                 if (debug)
 3065                         log(-1, " %s ", sppp_ipcp_opt_name(*p));
 3066                 switch (*p) {
 3067                 case IPCP_OPT_COMPRESSION:
 3068                         desiredcomp = p[2] << 8 | p[3];
 3069                         /* We only support VJ */
 3070                         if (desiredcomp == IPCP_COMP_VJ) {
 3071                                 if (debug)
 3072                                         log(-1, "VJ [ack] ");
 3073                                 sp->ipcp.flags |= IPCP_VJ;
 3074                                 sl_compress_init(sp->pp_comp, p[4]);
 3075                                 sp->ipcp.max_state = p[4];
 3076                                 sp->ipcp.compress_cid = p[5];
 3077                                 continue;
 3078                         }
 3079                         if (debug)
 3080                                 log(-1,
 3081                                     "compproto %#04x [not supported] ",
 3082                                     desiredcomp);
 3083                         p[2] = IPCP_COMP_VJ >> 8;
 3084                         p[3] = IPCP_COMP_VJ;
 3085                         p[4] = sp->ipcp.max_state;
 3086                         p[5] = sp->ipcp.compress_cid;
 3087                         break;
 3088                 case IPCP_OPT_ADDRESS:
 3089                         /* This is the address he wants in his end */
 3090                         desiredaddr = p[2] << 24 | p[3] << 16 |
 3091                                 p[4] << 8 | p[5];
 3092                         if (desiredaddr == hisaddr ||
 3093                             (hisaddr >= 1 && hisaddr <= 254 && desiredaddr != 0)) {
 3094                                 /*
 3095                                  * Peer's address is same as our value,
 3096                                  * or we have set it to 0.0.0.* to
 3097                                  * indicate that we do not really care,
 3098                                  * this is agreeable.  Gonna conf-ack
 3099                                  * it.
 3100                                  */
 3101                                 if (debug)
 3102                                         log(-1, "%s [ack] ",
 3103                                                 sppp_dotted_quad(hisaddr));
 3104                                 /* record that we've seen it already */
 3105                                 sp->ipcp.flags |= IPCP_HISADDR_SEEN;
 3106                                 continue;
 3107                         }
 3108                         /*
 3109                          * The address wasn't agreeable.  This is either
 3110                          * he sent us 0.0.0.0, asking to assign him an
 3111                          * address, or he send us another address not
 3112                          * matching our value.  Either case, we gonna
 3113                          * conf-nak it with our value.
 3114                          * XXX: we should "rej" if hisaddr == 0
 3115                          */
 3116                         if (debug) {
 3117                                 if (desiredaddr == 0)
 3118                                         log(-1, "[addr requested] ");
 3119                                 else
 3120                                         log(-1, "%s [not agreed] ",
 3121                                                 sppp_dotted_quad(desiredaddr));
 3122 
 3123                         }
 3124                         p[2] = hisaddr >> 24;
 3125                         p[3] = hisaddr >> 16;
 3126                         p[4] = hisaddr >> 8;
 3127                         p[5] = hisaddr;
 3128                         break;
 3129                 }
 3130                 /* Add the option to nak'ed list. */
 3131                 bcopy (p, r, p[1]);
 3132                 r += p[1];
 3133                 rlen += p[1];
 3134         }
 3135 
 3136         /*
 3137          * If we are about to conf-ack the request, but haven't seen
 3138          * his address so far, gonna conf-nak it instead, with the
 3139          * `address' option present and our idea of his address being
 3140          * filled in there, to request negotiation of both addresses.
 3141          *
 3142          * XXX This can result in an endless req - nak loop if peer
 3143          * doesn't want to send us his address.  Q: What should we do
 3144          * about it?  XXX  A: implement the max-failure counter.
 3145          */
 3146         if (rlen == 0 && !(sp->ipcp.flags & IPCP_HISADDR_SEEN) && !gotmyaddr) {
 3147                 buf[0] = IPCP_OPT_ADDRESS;
 3148                 buf[1] = 6;
 3149                 buf[2] = hisaddr >> 24;
 3150                 buf[3] = hisaddr >> 16;
 3151                 buf[4] = hisaddr >> 8;
 3152                 buf[5] = hisaddr;
 3153                 rlen = 6;
 3154                 if (debug)
 3155                         log(-1, "still need hisaddr ");
 3156         }
 3157 
 3158         if (rlen) {
 3159                 if (debug)
 3160                         log(-1, " send conf-nak\n");
 3161                 sppp_cp_send (sp, PPP_IPCP, CONF_NAK, h->ident, rlen, buf);
 3162         } else {
 3163                 if (debug)
 3164                         log(-1, " send conf-ack\n");
 3165                 sppp_cp_send (sp, PPP_IPCP, CONF_ACK,
 3166                               h->ident, origlen, h+1);
 3167         }
 3168 
 3169         free (buf, M_TEMP);
 3170         return (rlen == 0);
 3171 }
 3172 
 3173 /*
 3174  * Analyze the IPCP Configure-Reject option list, and adjust our
 3175  * negotiation.
 3176  */
 3177 static void
 3178 sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len)
 3179 {
 3180         u_char *buf, *p;
 3181         struct ifnet *ifp = SP2IFP(sp);
 3182         int debug = ifp->if_flags & IFF_DEBUG;
 3183 
 3184         len -= 4;
 3185         buf = malloc (len, M_TEMP, M_NOWAIT);
 3186         if (!buf)
 3187                 return;
 3188 
 3189         if (debug)
 3190                 log(LOG_DEBUG, SPP_FMT "ipcp rej opts: ",
 3191                     SPP_ARGS(ifp));
 3192 
 3193         p = (void*) (h+1);
 3194         for (; len >= 2 && p[1] >= 2 && len >= p[1];
 3195             len -= p[1], p += p[1]) {
 3196                 if (debug)
 3197                         log(-1, " %s ", sppp_ipcp_opt_name(*p));
 3198                 switch (*p) {
 3199                 case IPCP_OPT_COMPRESSION:
 3200                         sp->ipcp.opts &= ~(1 << IPCP_OPT_COMPRESSION);
 3201                         break;
 3202                 case IPCP_OPT_ADDRESS:
 3203                         /*
 3204                          * Peer doesn't grok address option.  This is
 3205                          * bad.  XXX  Should we better give up here?
 3206                          * XXX We could try old "addresses" option...
 3207                          */
 3208                         sp->ipcp.opts &= ~(1 << IPCP_OPT_ADDRESS);
 3209                         break;
 3210                 }
 3211         }
 3212         if (debug)
 3213                 log(-1, "\n");
 3214         free (buf, M_TEMP);
 3215         return;
 3216 }
 3217 
 3218 /*
 3219  * Analyze the IPCP Configure-NAK option list, and adjust our
 3220  * negotiation.
 3221  */
 3222 static void
 3223 sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len)
 3224 {
 3225         u_char *buf, *p;
 3226         struct ifnet *ifp = SP2IFP(sp);
 3227         int debug = ifp->if_flags & IFF_DEBUG;
 3228         int desiredcomp;
 3229         u_long wantaddr;
 3230 
 3231         len -= 4;
 3232         buf = malloc (len, M_TEMP, M_NOWAIT);
 3233         if (!buf)
 3234                 return;
 3235 
 3236         if (debug)
 3237                 log(LOG_DEBUG, SPP_FMT "ipcp nak opts: ",
 3238                     SPP_ARGS(ifp));
 3239 
 3240         p = (void*) (h+1);
 3241         for (; len >= 2 && p[1] >= 2 && len >= p[1];
 3242             len -= p[1], p += p[1]) {
 3243                 if (debug)
 3244                         log(-1, " %s ", sppp_ipcp_opt_name(*p));
 3245                 switch (*p) {
 3246                 case IPCP_OPT_COMPRESSION:
 3247                         if (len >= 6 && p[1] == 6) {
 3248                                 desiredcomp = p[2] << 8 | p[3];
 3249                                 if (debug)
 3250                                         log(-1, "[wantcomp %#04x] ",
 3251                                                 desiredcomp);
 3252                                 if (desiredcomp == IPCP_COMP_VJ) {
 3253                                         sl_compress_init(sp->pp_comp, p[4]);
 3254                                         sp->ipcp.max_state = p[4];
 3255                                         sp->ipcp.compress_cid = p[5];
 3256                                         if (debug)
 3257                                                 log(-1, "[agree] ");
 3258                                 } else
 3259                                         sp->ipcp.opts &=
 3260                                                 ~(1 << IPCP_OPT_COMPRESSION);
 3261                         }
 3262                         break;
 3263                 case IPCP_OPT_ADDRESS:
 3264                         /*
 3265                          * Peer doesn't like our local IP address.  See
 3266                          * if we can do something for him.  We'll drop
 3267                          * him our address then.
 3268                          */
 3269                         if (len >= 6 && p[1] == 6) {
 3270                                 wantaddr = p[2] << 24 | p[3] << 16 |
 3271                                         p[4] << 8 | p[5];
 3272                                 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS);
 3273                                 if (debug)
 3274                                         log(-1, "[wantaddr %s] ",
 3275                                                sppp_dotted_quad(wantaddr));
 3276                                 /*
 3277                                  * When doing dynamic address assignment,
 3278                                  * we accept his offer.  Otherwise, we
 3279                                  * ignore it and thus continue to negotiate
 3280                                  * our already existing value.
 3281                                  * XXX: Bogus, if he said no once, he'll
 3282                                  * just say no again, might as well die.
 3283                                  */
 3284                                 if (sp->ipcp.flags & IPCP_MYADDR_DYN) {
 3285                                         sppp_set_ip_addr(sp, wantaddr);
 3286                                         if (debug)
 3287                                                 log(-1, "[agree] ");
 3288                                         sp->ipcp.flags |= IPCP_MYADDR_SEEN;
 3289                                 }
 3290                         }
 3291                         break;
 3292                 }
 3293         }
 3294         if (debug)
 3295                 log(-1, "\n");
 3296         free (buf, M_TEMP);
 3297         return;
 3298 }
 3299 
 3300 static void
 3301 sppp_ipcp_tlu(struct sppp *sp)
 3302 {
 3303         /* we are up - notify isdn daemon */
 3304         if (sp->pp_con)
 3305                 sp->pp_con(sp);
 3306 }
 3307 
 3308 static void
 3309 sppp_ipcp_tld(struct sppp *sp)
 3310 {
 3311 }
 3312 
 3313 static void
 3314 sppp_ipcp_tls(struct sppp *sp)
 3315 {
 3316         /* indicate to LCP that it must stay alive */
 3317         sp->lcp.protos |= (1 << IDX_IPCP);
 3318 }
 3319 
 3320 static void
 3321 sppp_ipcp_tlf(struct sppp *sp)
 3322 {
 3323         /* we no longer need LCP */
 3324         sp->lcp.protos &= ~(1 << IDX_IPCP);
 3325         sppp_lcp_check_and_close(sp);
 3326 }
 3327 
 3328 static void
 3329 sppp_ipcp_scr(struct sppp *sp)
 3330 {
 3331         char opt[6 /* compression */ + 6 /* address */];
 3332         u_long ouraddr;
 3333         int i = 0;
 3334 
 3335         if (sp->ipcp.opts & (1 << IPCP_OPT_COMPRESSION)) {
 3336                 opt[i++] = IPCP_OPT_COMPRESSION;
 3337                 opt[i++] = 6;
 3338                 opt[i++] = IPCP_COMP_VJ >> 8;
 3339                 opt[i++] = IPCP_COMP_VJ;
 3340                 opt[i++] = sp->ipcp.max_state;
 3341                 opt[i++] = sp->ipcp.compress_cid;
 3342         }
 3343         if (sp->ipcp.opts & (1 << IPCP_OPT_ADDRESS)) {
 3344                 sppp_get_ip_addrs(sp, &ouraddr, 0, 0);
 3345                 opt[i++] = IPCP_OPT_ADDRESS;
 3346                 opt[i++] = 6;
 3347                 opt[i++] = ouraddr >> 24;
 3348                 opt[i++] = ouraddr >> 16;
 3349                 opt[i++] = ouraddr >> 8;
 3350                 opt[i++] = ouraddr;
 3351         }
 3352 
 3353         sp->confid[IDX_IPCP] = ++sp->pp_seq[IDX_IPCP];
 3354         sppp_cp_send(sp, PPP_IPCP, CONF_REQ, sp->confid[IDX_IPCP], i, &opt);
 3355 }
 3356 #else /* !INET */
 3357 static void
 3358 sppp_ipcp_init(struct sppp *sp)
 3359 {
 3360 }
 3361 
 3362 static void
 3363 sppp_ipcp_up(struct sppp *sp)
 3364 {
 3365 }
 3366 
 3367 static void
 3368 sppp_ipcp_down(struct sppp *sp)
 3369 {
 3370 }
 3371 
 3372 static void
 3373 sppp_ipcp_open(struct sppp *sp)
 3374 {
 3375 }
 3376 
 3377 static void
 3378 sppp_ipcp_close(struct sppp *sp)
 3379 {
 3380 }
 3381 
 3382 static void
 3383 sppp_ipcp_TO(void *cookie)
 3384 {
 3385 }
 3386 
 3387 static int
 3388 sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len)
 3389 {
 3390         return (0);
 3391 }
 3392 
 3393 static void
 3394 sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len)
 3395 {
 3396 }
 3397 
 3398 static void
 3399 sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len)
 3400 {
 3401 }
 3402 
 3403 static void
 3404 sppp_ipcp_tlu(struct sppp *sp)
 3405 {
 3406 }
 3407 
 3408 static void
 3409 sppp_ipcp_tld(struct sppp *sp)
 3410 {
 3411 }
 3412 
 3413 static void
 3414 sppp_ipcp_tls(struct sppp *sp)
 3415 {
 3416 }
 3417 
 3418 static void
 3419 sppp_ipcp_tlf(struct sppp *sp)
 3420 {
 3421 }
 3422 
 3423 static void
 3424 sppp_ipcp_scr(struct sppp *sp)
 3425 {
 3426 }
 3427 #endif
 3428 
 3429 /*
 3430  *--------------------------------------------------------------------------*
 3431  *                                                                          *
 3432  *                      The IPv6CP implementation.                          *
 3433  *                                                                          *
 3434  *--------------------------------------------------------------------------*
 3435  */
 3436 
 3437 #ifdef INET6
 3438 static void
 3439 sppp_ipv6cp_init(struct sppp *sp)
 3440 {
 3441         sp->ipv6cp.opts = 0;
 3442         sp->ipv6cp.flags = 0;
 3443         sp->state[IDX_IPV6CP] = STATE_INITIAL;
 3444         sp->fail_counter[IDX_IPV6CP] = 0;
 3445         sp->pp_seq[IDX_IPV6CP] = 0;
 3446         sp->pp_rseq[IDX_IPV6CP] = 0;
 3447         callout_init(&sp->ch[IDX_IPV6CP], CALLOUT_MPSAFE);
 3448 }
 3449 
 3450 static void
 3451 sppp_ipv6cp_up(struct sppp *sp)
 3452 {
 3453         sppp_up_event(&ipv6cp, sp);
 3454 }
 3455 
 3456 static void
 3457 sppp_ipv6cp_down(struct sppp *sp)
 3458 {
 3459         sppp_down_event(&ipv6cp, sp);
 3460 }
 3461 
 3462 static void
 3463 sppp_ipv6cp_open(struct sppp *sp)
 3464 {
 3465         STDDCL;
 3466         struct in6_addr myaddr, hisaddr;
 3467 
 3468 #ifdef IPV6CP_MYIFID_DYN
 3469         sp->ipv6cp.flags &= ~(IPV6CP_MYIFID_SEEN|IPV6CP_MYIFID_DYN);
 3470 #else
 3471         sp->ipv6cp.flags &= ~IPV6CP_MYIFID_SEEN;
 3472 #endif
 3473 
 3474         sppp_get_ip6_addrs(sp, &myaddr, &hisaddr, 0);
 3475         /*
 3476          * If we don't have our address, this probably means our
 3477          * interface doesn't want to talk IPv6 at all.  (This could
 3478          * be the case if somebody wants to speak only IPX, for
 3479          * example.)  Don't open IPv6CP in this case.
 3480          */
 3481         if (IN6_IS_ADDR_UNSPECIFIED(&myaddr)) {
 3482                 /* XXX this message should go away */
 3483                 if (debug)
 3484                         log(LOG_DEBUG, SPP_FMT "ipv6cp_open(): no IPv6 interface\n",
 3485                             SPP_ARGS(ifp));
 3486                 return;
 3487         }
 3488 
 3489         sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN;
 3490         sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID);
 3491         sppp_open_event(&ipv6cp, sp);
 3492 }
 3493 
 3494 static void
 3495 sppp_ipv6cp_close(struct sppp *sp)
 3496 {
 3497         sppp_close_event(&ipv6cp, sp);
 3498 }
 3499 
 3500 static void
 3501 sppp_ipv6cp_TO(void *cookie)
 3502 {
 3503         sppp_to_event(&ipv6cp, (struct sppp *)cookie);
 3504 }
 3505 
 3506 /*
 3507  * Analyze a configure request.  Return true if it was agreeable, and
 3508  * caused action sca, false if it has been rejected or nak'ed, and
 3509  * caused action scn.  (The return value is used to make the state
 3510  * transition decision in the state automaton.)
 3511  */
 3512 static int
 3513 sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len)
 3514 {
 3515         u_char *buf, *r, *p;
 3516         struct ifnet *ifp = SP2IFP(sp);
 3517         int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG;
 3518         struct in6_addr myaddr, desiredaddr, suggestaddr;
 3519         int ifidcount;
 3520         int type;
 3521         int collision, nohisaddr;
 3522         char ip6buf[INET6_ADDRSTRLEN];
 3523 
 3524         len -= 4;
 3525         origlen = len;
 3526         /*
 3527          * Make sure to allocate a buf that can at least hold a
 3528          * conf-nak with an `address' option.  We might need it below.
 3529          */
 3530         buf = r = malloc ((len < 6? 6: len), M_TEMP, M_NOWAIT);
 3531         if (! buf)
 3532                 return (0);
 3533 
 3534         /* pass 1: see if we can recognize them */
 3535         if (debug)
 3536                 log(LOG_DEBUG, SPP_FMT "ipv6cp parse opts:",
 3537                     SPP_ARGS(ifp));
 3538         p = (void*) (h+1);
 3539         ifidcount = 0;
 3540         for (rlen=0; len >= 2 && p[1] >= 2 && len >= p[1];
 3541             len-=p[1], p+=p[1]) {
 3542                 if (debug)
 3543                         log(-1, " %s", sppp_ipv6cp_opt_name(*p));
 3544                 switch (*p) {
 3545                 case IPV6CP_OPT_IFID:
 3546                         if (len >= 10 && p[1] == 10 && ifidcount == 0) {
 3547                                 /* correctly formed address option */
 3548                                 ifidcount++;
 3549                                 continue;
 3550                         }
 3551                         if (debug)
 3552                                 log(-1, " [invalid]");
 3553                         break;
 3554 #ifdef notyet
 3555                 case IPV6CP_OPT_COMPRESSION:
 3556                         if (len >= 4 && p[1] >= 4) {
 3557                                 /* correctly formed compress option */
 3558                                 continue;
 3559                         }
 3560                         if (debug)
 3561                                 log(-1, " [invalid]");
 3562                         break;
 3563 #endif
 3564                 default:
 3565                         /* Others not supported. */
 3566                         if (debug)
 3567                                 log(-1, " [rej]");
 3568                         break;
 3569                 }
 3570                 /* Add the option to rejected list. */
 3571                 bcopy (p, r, p[1]);
 3572                 r += p[1];
 3573                 rlen += p[1];
 3574         }
 3575         if (rlen) {
 3576                 if (debug)
 3577                         log(-1, " send conf-rej\n");
 3578                 sppp_cp_send (sp, PPP_IPV6CP, CONF_REJ, h->ident, rlen, buf);
 3579                 goto end;
 3580         } else if (debug)
 3581                 log(-1, "\n");
 3582 
 3583         /* pass 2: parse option values */
 3584         sppp_get_ip6_addrs(sp, &myaddr, 0, 0);
 3585         if (debug)
 3586                 log(LOG_DEBUG, SPP_FMT "ipv6cp parse opt values: ",
 3587                     SPP_ARGS(ifp));
 3588         p = (void*) (h+1);
 3589         len = origlen;
 3590         type = CONF_ACK;
 3591         for (rlen=0; len >= 2 && p[1] >= 2 && len >= p[1];
 3592             len-=p[1], p+=p[1]) {
 3593                 if (debug)
 3594                         log(-1, " %s", sppp_ipv6cp_opt_name(*p));
 3595                 switch (*p) {
 3596 #ifdef notyet
 3597                 case IPV6CP_OPT_COMPRESSION:
 3598                         continue;
 3599 #endif
 3600                 case IPV6CP_OPT_IFID:
 3601                         bzero(&desiredaddr, sizeof(desiredaddr));
 3602                         bcopy(&p[2], &desiredaddr.s6_addr[8], 8);
 3603                         collision = (bcmp(&desiredaddr.s6_addr[8],
 3604                                           &myaddr.s6_addr[8], 8) == 0);
 3605                         nohisaddr = IN6_IS_ADDR_UNSPECIFIED(&desiredaddr);
 3606 
 3607                         desiredaddr.s6_addr16[0] = htons(0xfe80);
 3608                         (void)in6_setscope(&desiredaddr, SP2IFP(sp), NULL);
 3609 
 3610                         if (!collision && !nohisaddr) {
 3611                                 /* no collision, hisaddr known - Conf-Ack */
 3612                                 type = CONF_ACK;
 3613 
 3614                                 if (debug) {
 3615                                         log(-1, " %s [%s]",
 3616                                             ip6_sprintf(ip6buf, &desiredaddr),
 3617                                             sppp_cp_type_name(type));
 3618                                 }
 3619                                 continue;
 3620                         }
 3621 
 3622                         bzero(&suggestaddr, sizeof(&suggestaddr));
 3623                         if (collision && nohisaddr) {
 3624                                 /* collision, hisaddr unknown - Conf-Rej */
 3625                                 type = CONF_REJ;
 3626                                 bzero(&p[2], 8);
 3627                         } else {
 3628                                 /*
 3629                                  * - no collision, hisaddr unknown, or
 3630                                  * - collision, hisaddr known
 3631                                  * Conf-Nak, suggest hisaddr
 3632                                  */
 3633                                 type = CONF_NAK;
 3634                                 sppp_suggest_ip6_addr(sp, &suggestaddr);
 3635                                 bcopy(&suggestaddr.s6_addr[8], &p[2], 8);
 3636                         }
 3637                         if (debug)
 3638                                 log(-1, " %s [%s]",
 3639                                     ip6_sprintf(ip6buf, &desiredaddr),
 3640                                     sppp_cp_type_name(type));
 3641                         break;
 3642                 }
 3643                 /* Add the option to nak'ed list. */
 3644                 bcopy (p, r, p[1]);
 3645                 r += p[1];
 3646                 rlen += p[1];
 3647         }
 3648 
 3649         if (rlen == 0 && type == CONF_ACK) {
 3650                 if (debug)
 3651                         log(-1, " send %s\n", sppp_cp_type_name(type));
 3652                 sppp_cp_send (sp, PPP_IPV6CP, type, h->ident, origlen, h+1);
 3653         } else {
 3654 #ifdef DIAGNOSTIC
 3655                 if (type == CONF_ACK)
 3656                         panic("IPv6CP RCR: CONF_ACK with non-zero rlen");
 3657 #endif
 3658 
 3659                 if (debug) {
 3660                         log(-1, " send %s suggest %s\n",
 3661                             sppp_cp_type_name(type),
 3662                             ip6_sprintf(ip6buf, &suggestaddr));
 3663                 }
 3664                 sppp_cp_send (sp, PPP_IPV6CP, type, h->ident, rlen, buf);
 3665         }
 3666 
 3667  end:
 3668         free (buf, M_TEMP);
 3669         return (rlen == 0);
 3670 }
 3671 
 3672 /*
 3673  * Analyze the IPv6CP Configure-Reject option list, and adjust our
 3674  * negotiation.
 3675  */
 3676 static void
 3677 sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len)
 3678 {
 3679         u_char *buf, *p;
 3680         struct ifnet *ifp = SP2IFP(sp);
 3681         int debug = ifp->if_flags & IFF_DEBUG;
 3682 
 3683         len -= 4;
 3684         buf = malloc (len, M_TEMP, M_NOWAIT);
 3685         if (!buf)
 3686                 return;
 3687 
 3688         if (debug)
 3689                 log(LOG_DEBUG, SPP_FMT "ipv6cp rej opts:",
 3690                     SPP_ARGS(ifp));
 3691 
 3692         p = (void*) (h+1);
 3693         for (; len >= 2 && p[1] >= 2 && len >= p[1];
 3694             len -= p[1], p += p[1]) {
 3695                 if (debug)
 3696                         log(-1, " %s", sppp_ipv6cp_opt_name(*p));
 3697                 switch (*p) {
 3698                 case IPV6CP_OPT_IFID:
 3699                         /*
 3700                          * Peer doesn't grok address option.  This is
 3701                          * bad.  XXX  Should we better give up here?
 3702                          */
 3703                         sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_IFID);
 3704                         break;
 3705 #ifdef notyet
 3706                 case IPV6CP_OPT_COMPRESS:
 3707                         sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_COMPRESS);
 3708                         break;
 3709 #endif
 3710                 }
 3711         }
 3712         if (debug)
 3713                 log(-1, "\n");
 3714         free (buf, M_TEMP);
 3715         return;
 3716 }
 3717 
 3718 /*
 3719  * Analyze the IPv6CP Configure-NAK option list, and adjust our
 3720  * negotiation.
 3721  */
 3722 static void
 3723 sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len)
 3724 {
 3725         u_char *buf, *p;
 3726         struct ifnet *ifp = SP2IFP(sp);
 3727         int debug = ifp->if_flags & IFF_DEBUG;
 3728         struct in6_addr suggestaddr;
 3729         char ip6buf[INET6_ADDRSTRLEN];
 3730 
 3731         len -= 4;
 3732         buf = malloc (len, M_TEMP, M_NOWAIT);
 3733         if (!buf)
 3734                 return;
 3735 
 3736         if (debug)
 3737                 log(LOG_DEBUG, SPP_FMT "ipv6cp nak opts:",
 3738                     SPP_ARGS(ifp));
 3739 
 3740         p = (void*) (h+1);
 3741         for (; len >= 2 && p[1] >= 2 && len >= p[1];
 3742             len -= p[1], p += p[1]) {
 3743                 if (debug)
 3744                         log(-1, " %s", sppp_ipv6cp_opt_name(*p));
 3745                 switch (*p) {
 3746                 case IPV6CP_OPT_IFID:
 3747                         /*
 3748                          * Peer doesn't like our local ifid.  See
 3749                          * if we can do something for him.  We'll drop
 3750                          * him our address then.
 3751                          */
 3752                         if (len < 10 || p[1] != 10)
 3753                                 break;
 3754                         bzero(&suggestaddr, sizeof(suggestaddr));
 3755                         suggestaddr.s6_addr16[0] = htons(0xfe80);
 3756                         (void)in6_setscope(&suggestaddr, SP2IFP(sp), NULL);
 3757                         bcopy(&p[2], &suggestaddr.s6_addr[8], 8);
 3758 
 3759                         sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID);
 3760                         if (debug)
 3761                                 log(-1, " [suggestaddr %s]",
 3762                                        ip6_sprintf(ip6buf, &suggestaddr));
 3763 #ifdef IPV6CP_MYIFID_DYN
 3764                         /*
 3765                          * When doing dynamic address assignment,
 3766                          * we accept his offer.
 3767                          */
 3768                         if (sp->ipv6cp.flags & IPV6CP_MYIFID_DYN) {
 3769                                 struct in6_addr lastsuggest;
 3770                                 /*
 3771                                  * If <suggested myaddr from peer> equals to
 3772                                  * <hisaddr we have suggested last time>,
 3773                                  * we have a collision.  generate new random
 3774                                  * ifid.
 3775                                  */
 3776                                 sppp_suggest_ip6_addr(&lastsuggest);
 3777                                 if (IN6_ARE_ADDR_EQUAL(&suggestaddr,
 3778                                                        lastsuggest)) {
 3779                                         if (debug)
 3780                                                 log(-1, " [random]");
 3781                                         sppp_gen_ip6_addr(sp, &suggestaddr);
 3782                                 }
 3783                                 sppp_set_ip6_addr(sp, &suggestaddr, 0);
 3784                                 if (debug)
 3785                                         log(-1, " [agree]");
 3786                                 sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN;
 3787                         }
 3788 #else
 3789                         /*
 3790                          * Since we do not do dynamic address assignment,
 3791                          * we ignore it and thus continue to negotiate
 3792                          * our already existing value.  This can possibly
 3793                          * go into infinite request-reject loop.
 3794                          *
 3795                          * This is not likely because we normally use
 3796                          * ifid based on MAC-address.
 3797                          * If you have no ethernet card on the node, too bad.
 3798                          * XXX should we use fail_counter?
 3799                          */
 3800 #endif
 3801                         break;
 3802 #ifdef notyet
 3803                 case IPV6CP_OPT_COMPRESS:
 3804                         /*
 3805                          * Peer wants different compression parameters.
 3806                          */
 3807                         break;
 3808 #endif
 3809                 }
 3810         }
 3811         if (debug)
 3812                 log(-1, "\n");
 3813         free (buf, M_TEMP);
 3814         return;
 3815 }
 3816 static void
 3817 sppp_ipv6cp_tlu(struct sppp *sp)
 3818 {
 3819         /* we are up - notify isdn daemon */
 3820         if (sp->pp_con)
 3821                 sp->pp_con(sp);
 3822 }
 3823 
 3824 static void
 3825 sppp_ipv6cp_tld(struct sppp *sp)
 3826 {
 3827 }
 3828 
 3829 static void
 3830 sppp_ipv6cp_tls(struct sppp *sp)
 3831 {
 3832         /* indicate to LCP that it must stay alive */
 3833         sp->lcp.protos |= (1 << IDX_IPV6CP);
 3834 }
 3835 
 3836 static void
 3837 sppp_ipv6cp_tlf(struct sppp *sp)
 3838 {
 3839 
 3840 #if 0   /* need #if 0 to close IPv6CP properly */
 3841         /* we no longer need LCP */
 3842         sp->lcp.protos &= ~(1 << IDX_IPV6CP);
 3843         sppp_lcp_check_and_close(sp);
 3844 #endif
 3845 }
 3846 
 3847 static void
 3848 sppp_ipv6cp_scr(struct sppp *sp)
 3849 {
 3850         char opt[10 /* ifid */ + 4 /* compression, minimum */];
 3851         struct in6_addr ouraddr;
 3852         int i = 0;
 3853 
 3854         if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_IFID)) {
 3855                 sppp_get_ip6_addrs(sp, &ouraddr, 0, 0);
 3856                 opt[i++] = IPV6CP_OPT_IFID;
 3857                 opt[i++] = 10;
 3858                 bcopy(&ouraddr.s6_addr[8], &opt[i], 8);
 3859                 i += 8;
 3860         }
 3861 
 3862 #ifdef notyet
 3863         if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_COMPRESSION)) {
 3864                 opt[i++] = IPV6CP_OPT_COMPRESSION;
 3865                 opt[i++] = 4;
 3866                 opt[i++] = 0;   /* TBD */
 3867                 opt[i++] = 0;   /* TBD */
 3868                 /* variable length data may follow */
 3869         }
 3870 #endif
 3871 
 3872         sp->confid[IDX_IPV6CP] = ++sp->pp_seq[IDX_IPV6CP];
 3873         sppp_cp_send(sp, PPP_IPV6CP, CONF_REQ, sp->confid[IDX_IPV6CP], i, &opt);
 3874 }
 3875 #else /*INET6*/
 3876 static void sppp_ipv6cp_init(struct sppp *sp)
 3877 {
 3878 }
 3879 
 3880 static void sppp_ipv6cp_up(struct sppp *sp)
 3881 {
 3882 }
 3883 
 3884 static void sppp_ipv6cp_down(struct sppp *sp)
 3885 {
 3886 }
 3887 
 3888 
 3889 static void sppp_ipv6cp_open(struct sppp *sp)
 3890 {
 3891 }
 3892 
 3893 static void sppp_ipv6cp_close(struct sppp *sp)
 3894 {
 3895 }
 3896 
 3897 static void sppp_ipv6cp_TO(void *sp)
 3898 {
 3899 }
 3900 
 3901 static int sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len)
 3902 {
 3903         return 0;
 3904 }
 3905 
 3906 static void sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len)
 3907 {
 3908 }
 3909 
 3910 static void sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len)
 3911 {
 3912 }
 3913 
 3914 static void sppp_ipv6cp_tlu(struct sppp *sp)
 3915 {
 3916 }
 3917 
 3918 static void sppp_ipv6cp_tld(struct sppp *sp)
 3919 {
 3920 }
 3921 
 3922 static void sppp_ipv6cp_tls(struct sppp *sp)
 3923 {
 3924 }
 3925 
 3926 static void sppp_ipv6cp_tlf(struct sppp *sp)
 3927 {
 3928 }
 3929 
 3930 static void sppp_ipv6cp_scr(struct sppp *sp)
 3931 {
 3932 }
 3933 #endif /*INET6*/
 3934 
 3935 /*
 3936  *--------------------------------------------------------------------------*
 3937  *                                                                          *
 3938  *                        The CHAP implementation.                          *
 3939  *                                                                          *
 3940  *--------------------------------------------------------------------------*
 3941  */
 3942 
 3943 /*
 3944  * The authentication protocols don't employ a full-fledged state machine as
 3945  * the control protocols do, since they do have Open and Close events, but
 3946  * not Up and Down, nor are they explicitly terminated.  Also, use of the
 3947  * authentication protocols may be different in both directions (this makes
 3948  * sense, think of a machine that never accepts incoming calls but only
 3949  * calls out, it doesn't require the called party to authenticate itself).
 3950  *
 3951  * Our state machine for the local authentication protocol (we are requesting
 3952  * the peer to authenticate) looks like:
 3953  *
 3954  *                                                  RCA-
 3955  *            +--------------------------------------------+
 3956  *            V                                     scn,tld|
 3957  *        +--------+                           Close   +---------+ RCA+
 3958  *        |        |<----------------------------------|         |------+
 3959  *   +--->| Closed |                            TO*    | Opened  | sca  |
 3960  *   |    |        |-----+                     +-------|         |<-----+
 3961  *   |    +--------+ irc |                     |       +---------+
 3962  *   |      ^            |                     |           ^
 3963  *   |      |            |                     |           |
 3964  *   |      |            |                     |           |
 3965  *   |   TO-|            |                     |           |
 3966  *   |      |tld  TO+    V                     |           |
 3967  *   |      |   +------->+                     |           |
 3968  *   |      |   |        |                     |           |
 3969  *   |    +--------+     V                     |           |
 3970  *   |    |        |<----+<--------------------+           |
 3971  *   |    | Req-   | scr                                   |
 3972  *   |    | Sent   |                                       |
 3973  *   |    |        |                                       |
 3974  *   |    +--------+                                       |
 3975  *   | RCA- |   | RCA+                                     |
 3976  *   +------+   +------------------------------------------+
 3977  *   scn,tld      sca,irc,ict,tlu
 3978  *
 3979  *
 3980  *   with:
 3981  *
 3982  *      Open:   LCP reached authentication phase
 3983  *      Close:  LCP reached terminate phase
 3984  *
 3985  *      RCA+:   received reply (pap-req, chap-response), acceptable
 3986  *      RCN:    received reply (pap-req, chap-response), not acceptable
 3987  *      TO+:    timeout with restart counter >= 0
 3988  *      TO-:    timeout with restart counter < 0
 3989  *      TO*:    reschedule timeout for CHAP
 3990  *
 3991  *      scr:    send request packet (none for PAP, chap-challenge)
 3992  *      sca:    send ack packet (pap-ack, chap-success)
 3993  *      scn:    send nak packet (pap-nak, chap-failure)
 3994  *      ict:    initialize re-challenge timer (CHAP only)
 3995  *
 3996  *      tlu:    this-layer-up, LCP reaches network phase
 3997  *      tld:    this-layer-down, LCP enters terminate phase
 3998  *
 3999  * Note that in CHAP mode, after sending a new challenge, while the state
 4000  * automaton falls back into Req-Sent state, it doesn't signal a tld
 4001  * event to LCP, so LCP remains in network phase.  Only after not getting
 4002  * any response (or after getting an unacceptable response), CHAP closes,
 4003  * causing LCP to enter terminate phase.
 4004  *
 4005  * With PAP, there is no initial request that can be sent.  The peer is
 4006  * expected to send one based on the successful negotiation of PAP as
 4007  * the authentication protocol during the LCP option negotiation.
 4008  *
 4009  * Incoming authentication protocol requests (remote requests
 4010  * authentication, we are peer) don't employ a state machine at all,
 4011  * they are simply answered.  Some peers [Ascend P50 firmware rev
 4012  * 4.50] react allergically when sending IPCP requests while they are
 4013  * still in authentication phase (thereby violating the standard that
 4014  * demands that these NCP packets are to be discarded), so we keep
 4015  * track of the peer demanding us to authenticate, and only proceed to
 4016  * phase network once we've seen a positive acknowledge for the
 4017  * authentication.
 4018  */
 4019 
 4020 /*
 4021  * Handle incoming CHAP packets.
 4022  */
 4023 static void
 4024 sppp_chap_input(struct sppp *sp, struct mbuf *m)
 4025 {
 4026         STDDCL;
 4027         struct lcp_header *h;
 4028         int len, x;
 4029         u_char *value, *name, digest[AUTHKEYLEN], dsize;
 4030         int value_len, name_len;
 4031         MD5_CTX ctx;
 4032 
 4033         len = m->m_pkthdr.len;
 4034         if (len < 4) {
 4035                 if (debug)
 4036                         log(LOG_DEBUG,
 4037                             SPP_FMT "chap invalid packet length: %d bytes\n",
 4038                             SPP_ARGS(ifp), len);
 4039                 return;
 4040         }
 4041         h = mtod (m, struct lcp_header*);
 4042         if (len > ntohs (h->len))
 4043                 len = ntohs (h->len);
 4044 
 4045         switch (h->type) {
 4046         /* challenge, failure and success are his authproto */
 4047         case CHAP_CHALLENGE:
 4048                 value = 1 + (u_char*)(h+1);
 4049                 value_len = value[-1];
 4050                 name = value + value_len;
 4051                 name_len = len - value_len - 5;
 4052                 if (name_len < 0) {
 4053                         if (debug) {
 4054                                 log(LOG_DEBUG,
 4055                                     SPP_FMT "chap corrupted challenge "
 4056                                     "<%s id=0x%x len=%d",
 4057                                     SPP_ARGS(ifp),
 4058                                     sppp_auth_type_name(PPP_CHAP, h->type),
 4059                                     h->ident, ntohs(h->len));
 4060                                 sppp_print_bytes((u_char*) (h+1), len-4);
 4061                                 log(-1, ">\n");
 4062                         }
 4063                         break;
 4064                 }
 4065 
 4066                 if (debug) {
 4067                         log(LOG_DEBUG,
 4068                             SPP_FMT "chap input <%s id=0x%x len=%d name=",
 4069                             SPP_ARGS(ifp),
 4070                             sppp_auth_type_name(PPP_CHAP, h->type), h->ident,
 4071                             ntohs(h->len));
 4072                         sppp_print_string((char*) name, name_len);
 4073                         log(-1, " value-size=%d value=", value_len);
 4074                         sppp_print_bytes(value, value_len);
 4075                         log(-1, ">\n");
 4076                 }
 4077 
 4078                 /* Compute reply value. */
 4079                 MD5Init(&ctx);
 4080                 MD5Update(&ctx, &h->ident, 1);
 4081                 MD5Update(&ctx, sp->myauth.secret,
 4082                           sppp_strnlen(sp->myauth.secret, AUTHKEYLEN));
 4083                 MD5Update(&ctx, value, value_len);
 4084                 MD5Final(digest, &ctx);
 4085                 dsize = sizeof digest;
 4086 
 4087                 sppp_auth_send(&chap, sp, CHAP_RESPONSE, h->ident,
 4088                                sizeof dsize, (const char *)&dsize,
 4089                                sizeof digest, digest,
 4090                                (size_t)sppp_strnlen(sp->myauth.name, AUTHNAMELEN),
 4091                                sp->myauth.name,
 4092                                0);
 4093                 break;
 4094 
 4095         case CHAP_SUCCESS:
 4096                 if (debug) {
 4097                         log(LOG_DEBUG, SPP_FMT "chap success",
 4098                             SPP_ARGS(ifp));
 4099                         if (len > 4) {
 4100                                 log(-1, ": ");
 4101                                 sppp_print_string((char*)(h + 1), len - 4);
 4102                         }
 4103                         log(-1, "\n");
 4104                 }
 4105                 x = splimp();
 4106                 SPPP_LOCK(sp);
 4107                 sp->pp_flags &= ~PP_NEEDAUTH;
 4108                 if (sp->myauth.proto == PPP_CHAP &&
 4109                     (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) &&
 4110                     (sp->lcp.protos & (1 << IDX_CHAP)) == 0) {
 4111                         /*
 4112                          * We are authenticator for CHAP but didn't
 4113                          * complete yet.  Leave it to tlu to proceed
 4114                          * to network phase.
 4115                          */
 4116                         SPPP_UNLOCK(sp);
 4117                         splx(x);
 4118                         break;
 4119                 }
 4120                 SPPP_UNLOCK(sp);
 4121                 splx(x);
 4122                 sppp_phase_network(sp);
 4123                 break;
 4124 
 4125         case CHAP_FAILURE:
 4126                 if (debug) {
 4127                         log(LOG_INFO, SPP_FMT "chap failure",
 4128                             SPP_ARGS(ifp));
 4129                         if (len > 4) {
 4130                                 log(-1, ": ");
 4131                                 sppp_print_string((char*)(h + 1), len - 4);
 4132                         }
 4133                         log(-1, "\n");
 4134                 } else
 4135                         log(LOG_INFO, SPP_FMT "chap failure\n",
 4136                             SPP_ARGS(ifp));
 4137                 /* await LCP shutdown by authenticator */
 4138                 break;
 4139 
 4140         /* response is my authproto */
 4141         case CHAP_RESPONSE:
 4142                 value = 1 + (u_char*)(h+1);
 4143                 value_len = value[-1];
 4144                 name = value + value_len;
 4145                 name_len = len - value_len - 5;
 4146                 if (name_len < 0) {
 4147                         if (debug) {
 4148                                 log(LOG_DEBUG,
 4149                                     SPP_FMT "chap corrupted response "
 4150                                     "<%s id=0x%x len=%d",
 4151                                     SPP_ARGS(ifp),
 4152                                     sppp_auth_type_name(PPP_CHAP, h->type),
 4153                                     h->ident, ntohs(h->len));
 4154                                 sppp_print_bytes((u_char*)(h+1), len-4);
 4155                                 log(-1, ">\n");
 4156                         }
 4157                         break;
 4158                 }
 4159                 if (h->ident != sp->confid[IDX_CHAP]) {
 4160                         if (debug)
 4161                                 log(LOG_DEBUG,
 4162                                     SPP_FMT "chap dropping response for old ID "
 4163                                     "(got %d, expected %d)\n",
 4164                                     SPP_ARGS(ifp),
 4165                                     h->ident, sp->confid[IDX_CHAP]);
 4166                         break;
 4167                 }
 4168                 if (name_len != sppp_strnlen(sp->hisauth.name, AUTHNAMELEN)
 4169                     || bcmp(name, sp->hisauth.name, name_len) != 0) {
 4170                         log(LOG_INFO, SPP_FMT "chap response, his name ",
 4171                             SPP_ARGS(ifp));
 4172                         sppp_print_string(name, name_len);
 4173                         log(-1, " != expected ");
 4174                         sppp_print_string(sp->hisauth.name,
 4175                                           sppp_strnlen(sp->hisauth.name, AUTHNAMELEN));
 4176                         log(-1, "\n");
 4177                 }
 4178                 if (debug) {
 4179                         log(LOG_DEBUG, SPP_FMT "chap input(%s) "
 4180                             "<%s id=0x%x len=%d name=",
 4181                             SPP_ARGS(ifp),
 4182                             sppp_state_name(sp->state[IDX_CHAP]),
 4183                             sppp_auth_type_name(PPP_CHAP, h->type),
 4184                             h->ident, ntohs (h->len));
 4185                         sppp_print_string((char*)name, name_len);
 4186                         log(-1, " value-size=%d value=", value_len);
 4187                         sppp_print_bytes(value, value_len);
 4188                         log(-1, ">\n");
 4189                 }
 4190                 if (value_len != AUTHKEYLEN) {
 4191                         if (debug)
 4192                                 log(LOG_DEBUG,
 4193                                     SPP_FMT "chap bad hash value length: "
 4194                                     "%d bytes, should be %d\n",
 4195                                     SPP_ARGS(ifp), value_len,
 4196                                     AUTHKEYLEN);
 4197                         break;
 4198                 }
 4199 
 4200                 MD5Init(&ctx);
 4201                 MD5Update(&ctx, &h->ident, 1);
 4202                 MD5Update(&ctx, sp->hisauth.secret,
 4203                           sppp_strnlen(sp->hisauth.secret, AUTHKEYLEN));
 4204                 MD5Update(&ctx, sp->myauth.challenge, AUTHKEYLEN);
 4205                 MD5Final(digest, &ctx);
 4206 
 4207 #define FAILMSG "Failed..."
 4208 #define SUCCMSG "Welcome!"
 4209 
 4210                 if (value_len != sizeof digest ||
 4211                     bcmp(digest, value, value_len) != 0) {
 4212                         /* action scn, tld */
 4213                         sppp_auth_send(&chap, sp, CHAP_FAILURE, h->ident,
 4214                                        sizeof(FAILMSG) - 1, (u_char *)FAILMSG,
 4215                                        0);
 4216                         chap.tld(sp);
 4217                         break;
 4218                 }
 4219                 /* action sca, perhaps tlu */
 4220                 if (sp->state[IDX_CHAP] == STATE_REQ_SENT ||
 4221                     sp->state[IDX_CHAP] == STATE_OPENED)
 4222                         sppp_auth_send(&chap, sp, CHAP_SUCCESS, h->ident,
 4223                                        sizeof(SUCCMSG) - 1, (u_char *)SUCCMSG,
 4224                                        0);
 4225                 if (sp->state[IDX_CHAP] == STATE_REQ_SENT) {
 4226                         sppp_cp_change_state(&chap, sp, STATE_OPENED);
 4227                         chap.tlu(sp);
 4228                 }
 4229                 break;
 4230 
 4231         default:
 4232                 /* Unknown CHAP packet type -- ignore. */
 4233                 if (debug) {
 4234                         log(LOG_DEBUG, SPP_FMT "chap unknown input(%s) "
 4235                             "<0x%x id=0x%xh len=%d",
 4236                             SPP_ARGS(ifp),
 4237                             sppp_state_name(sp->state[IDX_CHAP]),
 4238                             h->type, h->ident, ntohs(h->len));
 4239                         sppp_print_bytes((u_char*)(h+1), len-4);
 4240                         log(-1, ">\n");
 4241                 }
 4242                 break;
 4243 
 4244         }
 4245 }
 4246 
 4247 static void
 4248 sppp_chap_init(struct sppp *sp)
 4249 {
 4250         /* Chap doesn't have STATE_INITIAL at all. */
 4251         sp->state[IDX_CHAP] = STATE_CLOSED;
 4252         sp->fail_counter[IDX_CHAP] = 0;
 4253         sp->pp_seq[IDX_CHAP] = 0;
 4254         sp->pp_rseq[IDX_CHAP] = 0;
 4255         callout_init(&sp->ch[IDX_CHAP], CALLOUT_MPSAFE);
 4256 }
 4257 
 4258 static void
 4259 sppp_chap_open(struct sppp *sp)
 4260 {
 4261         if (sp->myauth.proto == PPP_CHAP &&
 4262             (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) {
 4263                 /* we are authenticator for CHAP, start it */
 4264                 chap.scr(sp);
 4265                 sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure;
 4266                 sppp_cp_change_state(&chap, sp, STATE_REQ_SENT);
 4267         }
 4268         /* nothing to be done if we are peer, await a challenge */
 4269 }
 4270 
 4271 static void
 4272 sppp_chap_close(struct sppp *sp)
 4273 {
 4274         if (sp->state[IDX_CHAP] != STATE_CLOSED)
 4275                 sppp_cp_change_state(&chap, sp, STATE_CLOSED);
 4276 }
 4277 
 4278 static void
 4279 sppp_chap_TO(void *cookie)
 4280 {
 4281         struct sppp *sp = (struct sppp *)cookie;
 4282         STDDCL;
 4283         int s;
 4284 
 4285         s = splimp();
 4286         SPPP_LOCK(sp);
 4287         if (debug)
 4288                 log(LOG_DEBUG, SPP_FMT "chap TO(%s) rst_counter = %d\n",
 4289                     SPP_ARGS(ifp),
 4290                     sppp_state_name(sp->state[IDX_CHAP]),
 4291                     sp->rst_counter[IDX_CHAP]);
 4292 
 4293         if (--sp->rst_counter[IDX_CHAP] < 0)
 4294                 /* TO- event */
 4295                 switch (sp->state[IDX_CHAP]) {
 4296                 case STATE_REQ_SENT:
 4297                         chap.tld(sp);
 4298                         sppp_cp_change_state(&chap, sp, STATE_CLOSED);
 4299                         break;
 4300                 }
 4301         else
 4302                 /* TO+ (or TO*) event */
 4303                 switch (sp->state[IDX_CHAP]) {
 4304                 case STATE_OPENED:
 4305                         /* TO* event */
 4306                         sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure;
 4307                         /* FALLTHROUGH */
 4308                 case STATE_REQ_SENT:
 4309                         chap.scr(sp);
 4310                         /* sppp_cp_change_state() will restart the timer */
 4311                         sppp_cp_change_state(&chap, sp, STATE_REQ_SENT);
 4312                         break;
 4313                 }
 4314 
 4315         SPPP_UNLOCK(sp);
 4316         splx(s);
 4317 }
 4318 
 4319 static void
 4320 sppp_chap_tlu(struct sppp *sp)
 4321 {
 4322         STDDCL;
 4323         int i, x;
 4324 
 4325         i = 0;
 4326         sp->rst_counter[IDX_CHAP] = sp->lcp.max_configure;
 4327 
 4328         /*
 4329          * Some broken CHAP implementations (Conware CoNet, firmware
 4330          * 4.0.?) don't want to re-authenticate their CHAP once the
 4331          * initial challenge-response exchange has taken place.
 4332          * Provide for an option to avoid rechallenges.
 4333          */
 4334         if ((sp->hisauth.flags & AUTHFLAG_NORECHALLENGE) == 0) {
 4335                 /*
 4336                  * Compute the re-challenge timeout.  This will yield
 4337                  * a number between 300 and 810 seconds.
 4338                  */
 4339                 i = 300 + ((unsigned)(random() & 0xff00) >> 7);
 4340                 callout_reset(&sp->ch[IDX_CHAP], i * hz, chap.TO, (void *)sp);
 4341         }
 4342 
 4343         if (debug) {
 4344                 log(LOG_DEBUG,
 4345                     SPP_FMT "chap %s, ",
 4346                     SPP_ARGS(ifp),
 4347                     sp->pp_phase == PHASE_NETWORK? "reconfirmed": "tlu");
 4348                 if ((sp->hisauth.flags & AUTHFLAG_NORECHALLENGE) == 0)
 4349                         log(-1, "next re-challenge in %d seconds\n", i);
 4350                 else
 4351                         log(-1, "re-challenging supressed\n");
 4352         }
 4353 
 4354         x = splimp();
 4355         SPPP_LOCK(sp);
 4356         /* indicate to LCP that we need to be closed down */
 4357         sp->lcp.protos |= (1 << IDX_CHAP);
 4358 
 4359         if (sp->pp_flags & PP_NEEDAUTH) {
 4360                 /*
 4361                  * Remote is authenticator, but his auth proto didn't
 4362                  * complete yet.  Defer the transition to network
 4363                  * phase.
 4364                  */
 4365                 SPPP_UNLOCK(sp);
 4366                 splx(x);
 4367                 return;
 4368         }
 4369         SPPP_UNLOCK(sp);
 4370         splx(x);
 4371 
 4372         /*
 4373          * If we are already in phase network, we are done here.  This
 4374          * is the case if this is a dummy tlu event after a re-challenge.
 4375          */
 4376         if (sp->pp_phase != PHASE_NETWORK)
 4377                 sppp_phase_network(sp);
 4378 }
 4379 
 4380 static void
 4381 sppp_chap_tld(struct sppp *sp)
 4382 {
 4383         STDDCL;
 4384 
 4385         if (debug)
 4386                 log(LOG_DEBUG, SPP_FMT "chap tld\n", SPP_ARGS(ifp));
 4387         callout_stop(&sp->ch[IDX_CHAP]);
 4388         sp->lcp.protos &= ~(1 << IDX_CHAP);
 4389 
 4390         lcp.Close(sp);
 4391 }
 4392 
 4393 static void
 4394 sppp_chap_scr(struct sppp *sp)
 4395 {
 4396         u_long *ch, seed;
 4397         u_char clen;
 4398 
 4399         /* Compute random challenge. */
 4400         ch = (u_long *)sp->myauth.challenge;
 4401         read_random(&seed, sizeof seed);
 4402         ch[0] = seed ^ random();
 4403         ch[1] = seed ^ random();
 4404         ch[2] = seed ^ random();
 4405         ch[3] = seed ^ random();
 4406         clen = AUTHKEYLEN;
 4407 
 4408         sp->confid[IDX_CHAP] = ++sp->pp_seq[IDX_CHAP];
 4409 
 4410         sppp_auth_send(&chap, sp, CHAP_CHALLENGE, sp->confid[IDX_CHAP],
 4411                        sizeof clen, (const char *)&clen,
 4412                        (size_t)AUTHKEYLEN, sp->myauth.challenge,
 4413                        (size_t)sppp_strnlen(sp->myauth.name, AUTHNAMELEN),
 4414                        sp->myauth.name,
 4415                        0);
 4416 }
 4417 
 4418 /*
 4419  *--------------------------------------------------------------------------*
 4420  *                                                                          *
 4421  *                        The PAP implementation.                           *
 4422  *                                                                          *
 4423  *--------------------------------------------------------------------------*
 4424  */
 4425 /*
 4426  * For PAP, we need to keep a little state also if we are the peer, not the
 4427  * authenticator.  This is since we don't get a request to authenticate, but
 4428  * have to repeatedly authenticate ourself until we got a response (or the
 4429  * retry counter is expired).
 4430  */
 4431 
 4432 /*
 4433  * Handle incoming PAP packets.  */
 4434 static void
 4435 sppp_pap_input(struct sppp *sp, struct mbuf *m)
 4436 {
 4437         STDDCL;
 4438         struct lcp_header *h;
 4439         int len, x;
 4440         u_char *name, *passwd, mlen;
 4441         int name_len, passwd_len;
 4442 
 4443         len = m->m_pkthdr.len;
 4444         if (len < 5) {
 4445                 if (debug)
 4446                         log(LOG_DEBUG,
 4447                             SPP_FMT "pap invalid packet length: %d bytes\n",
 4448                             SPP_ARGS(ifp), len);
 4449                 return;
 4450         }
 4451         h = mtod (m, struct lcp_header*);
 4452         if (len > ntohs (h->len))
 4453                 len = ntohs (h->len);
 4454         switch (h->type) {
 4455         /* PAP request is my authproto */
 4456         case PAP_REQ:
 4457                 name = 1 + (u_char*)(h+1);
 4458                 name_len = name[-1];
 4459                 passwd = name + name_len + 1;
 4460                 if (name_len > len - 6 ||
 4461                     (passwd_len = passwd[-1]) > len - 6 - name_len) {
 4462                         if (debug) {
 4463                                 log(LOG_DEBUG, SPP_FMT "pap corrupted input "
 4464                                     "<%s id=0x%x len=%d",
 4465                                     SPP_ARGS(ifp),
 4466                                     sppp_auth_type_name(PPP_PAP, h->type),
 4467                                     h->ident, ntohs(h->len));
 4468                                 sppp_print_bytes((u_char*)(h+1), len-4);
 4469                                 log(-1, ">\n");
 4470                         }
 4471                         break;
 4472                 }
 4473                 if (debug) {
 4474                         log(LOG_DEBUG, SPP_FMT "pap input(%s) "
 4475                             "<%s id=0x%x len=%d name=",
 4476                             SPP_ARGS(ifp),
 4477                             sppp_state_name(sp->state[IDX_PAP]),
 4478                             sppp_auth_type_name(PPP_PAP, h->type),
 4479                             h->ident, ntohs(h->len));
 4480                         sppp_print_string((char*)name, name_len);
 4481                         log(-1, " passwd=");
 4482                         sppp_print_string((char*)passwd, passwd_len);
 4483                         log(-1, ">\n");
 4484                 }
 4485                 if (name_len != sppp_strnlen(sp->hisauth.name, AUTHNAMELEN) ||
 4486                     passwd_len != sppp_strnlen(sp->hisauth.secret, AUTHKEYLEN) ||
 4487                     bcmp(name, sp->hisauth.name, name_len) != 0 ||
 4488                     bcmp(passwd, sp->hisauth.secret, passwd_len) != 0) {
 4489                         /* action scn, tld */
 4490                         mlen = sizeof(FAILMSG) - 1;
 4491                         sppp_auth_send(&pap, sp, PAP_NAK, h->ident,
 4492                                        sizeof mlen, (const char *)&mlen,
 4493                                        sizeof(FAILMSG) - 1, (u_char *)FAILMSG,
 4494                                        0);
 4495                         pap.tld(sp);
 4496                         break;
 4497                 }
 4498                 /* action sca, perhaps tlu */
 4499                 if (sp->state[IDX_PAP] == STATE_REQ_SENT ||
 4500                     sp->state[IDX_PAP] == STATE_OPENED) {
 4501                         mlen = sizeof(SUCCMSG) - 1;
 4502                         sppp_auth_send(&pap, sp, PAP_ACK, h->ident,
 4503                                        sizeof mlen, (const char *)&mlen,
 4504                                        sizeof(SUCCMSG) - 1, (u_char *)SUCCMSG,
 4505                                        0);
 4506                 }
 4507                 if (sp->state[IDX_PAP] == STATE_REQ_SENT) {
 4508                         sppp_cp_change_state(&pap, sp, STATE_OPENED);
 4509                         pap.tlu(sp);
 4510                 }
 4511                 break;
 4512 
 4513         /* ack and nak are his authproto */
 4514         case PAP_ACK:
 4515                 callout_stop(&sp->pap_my_to_ch);
 4516                 if (debug) {
 4517                         log(LOG_DEBUG, SPP_FMT "pap success",
 4518                             SPP_ARGS(ifp));
 4519                         name_len = *((char *)h);
 4520                         if (len > 5 && name_len) {
 4521                                 log(-1, ": ");
 4522                                 sppp_print_string((char*)(h+1), name_len);
 4523                         }
 4524                         log(-1, "\n");
 4525                 }
 4526                 x = splimp();
 4527                 SPPP_LOCK(sp);
 4528                 sp->pp_flags &= ~PP_NEEDAUTH;
 4529                 if (sp->myauth.proto == PPP_PAP &&
 4530                     (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) &&
 4531                     (sp->lcp.protos & (1 << IDX_PAP)) == 0) {
 4532                         /*
 4533                          * We are authenticator for PAP but didn't
 4534                          * complete yet.  Leave it to tlu to proceed
 4535                          * to network phase.
 4536                          */
 4537                         SPPP_UNLOCK(sp);
 4538                         splx(x);
 4539                         break;
 4540                 }
 4541                 SPPP_UNLOCK(sp);
 4542                 splx(x);
 4543                 sppp_phase_network(sp);
 4544                 break;
 4545 
 4546         case PAP_NAK:
 4547                 callout_stop (&sp->pap_my_to_ch);
 4548                 if (debug) {
 4549                         log(LOG_INFO, SPP_FMT "pap failure",
 4550                             SPP_ARGS(ifp));
 4551                         name_len = *((char *)h);
 4552                         if (len > 5 && name_len) {
 4553                                 log(-1, ": ");
 4554                                 sppp_print_string((char*)(h+1), name_len);
 4555                         }
 4556                         log(-1, "\n");
 4557                 } else
 4558                         log(LOG_INFO, SPP_FMT "pap failure\n",
 4559                             SPP_ARGS(ifp));
 4560                 /* await LCP shutdown by authenticator */
 4561                 break;
 4562 
 4563         default:
 4564                 /* Unknown PAP packet type -- ignore. */
 4565                 if (debug) {
 4566                         log(LOG_DEBUG, SPP_FMT "pap corrupted input "
 4567                             "<0x%x id=0x%x len=%d",
 4568                             SPP_ARGS(ifp),
 4569                             h->type, h->ident, ntohs(h->len));
 4570                         sppp_print_bytes((u_char*)(h+1), len-4);
 4571                         log(-1, ">\n");
 4572                 }
 4573                 break;
 4574 
 4575         }
 4576 }
 4577 
 4578 static void
 4579 sppp_pap_init(struct sppp *sp)
 4580 {
 4581         /* PAP doesn't have STATE_INITIAL at all. */
 4582         sp->state[IDX_PAP] = STATE_CLOSED;
 4583         sp->fail_counter[IDX_PAP] = 0;
 4584         sp->pp_seq[IDX_PAP] = 0;
 4585         sp->pp_rseq[IDX_PAP] = 0;
 4586         callout_init(&sp->ch[IDX_PAP], CALLOUT_MPSAFE);
 4587         callout_init(&sp->pap_my_to_ch, CALLOUT_MPSAFE);
 4588 }
 4589 
 4590 static void
 4591 sppp_pap_open(struct sppp *sp)
 4592 {
 4593         if (sp->hisauth.proto == PPP_PAP &&
 4594             (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0) {
 4595                 /* we are authenticator for PAP, start our timer */
 4596                 sp->rst_counter[IDX_PAP] = sp->lcp.max_configure;
 4597                 sppp_cp_change_state(&pap, sp, STATE_REQ_SENT);
 4598         }
 4599         if (sp->myauth.proto == PPP_PAP) {
 4600                 /* we are peer, send a request, and start a timer */
 4601                 pap.scr(sp);
 4602                 callout_reset(&sp->pap_my_to_ch, sp->lcp.timeout,
 4603                               sppp_pap_my_TO, (void *)sp);
 4604         }
 4605 }
 4606 
 4607 static void
 4608 sppp_pap_close(struct sppp *sp)
 4609 {
 4610         if (sp->state[IDX_PAP] != STATE_CLOSED)
 4611                 sppp_cp_change_state(&pap, sp, STATE_CLOSED);
 4612 }
 4613 
 4614 /*
 4615  * That's the timeout routine if we are authenticator.  Since the
 4616  * authenticator is basically passive in PAP, we can't do much here.
 4617  */
 4618 static void
 4619 sppp_pap_TO(void *cookie)
 4620 {
 4621         struct sppp *sp = (struct sppp *)cookie;
 4622         STDDCL;
 4623         int s;
 4624 
 4625         s = splimp();
 4626         SPPP_LOCK(sp);
 4627         if (debug)
 4628                 log(LOG_DEBUG, SPP_FMT "pap TO(%s) rst_counter = %d\n",
 4629                     SPP_ARGS(ifp),
 4630                     sppp_state_name(sp->state[IDX_PAP]),
 4631                     sp->rst_counter[IDX_PAP]);
 4632 
 4633         if (--sp->rst_counter[IDX_PAP] < 0)
 4634                 /* TO- event */
 4635                 switch (sp->state[IDX_PAP]) {
 4636                 case STATE_REQ_SENT:
 4637                         pap.tld(sp);
 4638                         sppp_cp_change_state(&pap, sp, STATE_CLOSED);
 4639                         break;
 4640                 }
 4641         else
 4642                 /* TO+ event, not very much we could do */
 4643                 switch (sp->state[IDX_PAP]) {
 4644                 case STATE_REQ_SENT:
 4645                         /* sppp_cp_change_state() will restart the timer */
 4646                         sppp_cp_change_state(&pap, sp, STATE_REQ_SENT);
 4647                         break;
 4648                 }
 4649 
 4650         SPPP_UNLOCK(sp);
 4651         splx(s);
 4652 }
 4653 
 4654 /*
 4655  * That's the timeout handler if we are peer.  Since the peer is active,
 4656  * we need to retransmit our PAP request since it is apparently lost.
 4657  * XXX We should impose a max counter.
 4658  */
 4659 static void
 4660 sppp_pap_my_TO(void *cookie)
 4661 {
 4662         struct sppp *sp = (struct sppp *)cookie;
 4663         STDDCL;
 4664 
 4665         if (debug)
 4666                 log(LOG_DEBUG, SPP_FMT "pap peer TO\n",
 4667                     SPP_ARGS(ifp));
 4668 
 4669         SPPP_LOCK(sp);
 4670         pap.scr(sp);
 4671         SPPP_UNLOCK(sp);
 4672 }
 4673 
 4674 static void
 4675 sppp_pap_tlu(struct sppp *sp)
 4676 {
 4677         STDDCL;
 4678         int x;
 4679 
 4680         sp->rst_counter[IDX_PAP] = sp->lcp.max_configure;
 4681 
 4682         if (debug)
 4683                 log(LOG_DEBUG, SPP_FMT "%s tlu\n",
 4684                     SPP_ARGS(ifp), pap.name);
 4685 
 4686         x = splimp();
 4687         SPPP_LOCK(sp);
 4688         /* indicate to LCP that we need to be closed down */
 4689         sp->lcp.protos |= (1 << IDX_PAP);
 4690 
 4691         if (sp->pp_flags & PP_NEEDAUTH) {
 4692                 /*
 4693                  * Remote is authenticator, but his auth proto didn't
 4694                  * complete yet.  Defer the transition to network
 4695                  * phase.
 4696                  */
 4697                 SPPP_UNLOCK(sp);
 4698                 splx(x);
 4699                 return;
 4700         }
 4701         SPPP_UNLOCK(sp);
 4702         splx(x);
 4703         sppp_phase_network(sp);
 4704 }
 4705 
 4706 static void
 4707 sppp_pap_tld(struct sppp *sp)
 4708 {
 4709         STDDCL;
 4710 
 4711         if (debug)
 4712                 log(LOG_DEBUG, SPP_FMT "pap tld\n", SPP_ARGS(ifp));
 4713         callout_stop (&sp->ch[IDX_PAP]);
 4714         callout_stop (&sp->pap_my_to_ch);
 4715         sp->lcp.protos &= ~(1 << IDX_PAP);
 4716 
 4717         lcp.Close(sp);
 4718 }
 4719 
 4720 static void
 4721 sppp_pap_scr(struct sppp *sp)
 4722 {
 4723         u_char idlen, pwdlen;
 4724 
 4725         sp->confid[IDX_PAP] = ++sp->pp_seq[IDX_PAP];
 4726         pwdlen = sppp_strnlen(sp->myauth.secret, AUTHKEYLEN);
 4727         idlen = sppp_strnlen(sp->myauth.name, AUTHNAMELEN);
 4728 
 4729         sppp_auth_send(&pap, sp, PAP_REQ, sp->confid[IDX_PAP],
 4730                        sizeof idlen, (const char *)&idlen,
 4731                        (size_t)idlen, sp->myauth.name,
 4732                        sizeof pwdlen, (const char *)&pwdlen,
 4733                        (size_t)pwdlen, sp->myauth.secret,
 4734                        0);
 4735 }
 4736 
 4737 /*
 4738  * Random miscellaneous functions.
 4739  */
 4740 
 4741 /*
 4742  * Send a PAP or CHAP proto packet.
 4743  *
 4744  * Varadic function, each of the elements for the ellipsis is of type
 4745  * ``size_t mlen, const u_char *msg''.  Processing will stop iff
 4746  * mlen == 0.
 4747  * NOTE: never declare variadic functions with types subject to type
 4748  * promotion (i.e. u_char). This is asking for big trouble depending
 4749  * on the architecture you are on...
 4750  */
 4751 
 4752 static void
 4753 sppp_auth_send(const struct cp *cp, struct sppp *sp,
 4754                unsigned int type, unsigned int id,
 4755                ...)
 4756 {
 4757         STDDCL;
 4758         struct ppp_header *h;
 4759         struct lcp_header *lh;
 4760         struct mbuf *m;
 4761         u_char *p;
 4762         int len;
 4763         unsigned int mlen;
 4764         const char *msg;
 4765         va_list ap;
 4766 
 4767         MGETHDR (m, M_DONTWAIT, MT_DATA);
 4768         if (! m)
 4769                 return;
 4770         m->m_pkthdr.rcvif = 0;
 4771 
 4772         h = mtod (m, struct ppp_header*);
 4773         h->address = PPP_ALLSTATIONS;           /* broadcast address */
 4774         h->control = PPP_UI;                    /* Unnumbered Info */
 4775         h->protocol = htons(cp->proto);
 4776 
 4777         lh = (struct lcp_header*)(h + 1);
 4778         lh->type = type;
 4779         lh->ident = id;
 4780         p = (u_char*) (lh+1);
 4781 
 4782         va_start(ap, id);
 4783         len = 0;
 4784 
 4785         while ((mlen = (unsigned int)va_arg(ap, size_t)) != 0) {
 4786                 msg = va_arg(ap, const char *);
 4787                 len += mlen;
 4788                 if (len > MHLEN - PPP_HEADER_LEN - LCP_HEADER_LEN) {
 4789                         va_end(ap);
 4790                         m_freem(m);
 4791                         return;
 4792                 }
 4793 
 4794                 bcopy(msg, p, mlen);
 4795                 p += mlen;
 4796         }
 4797         va_end(ap);
 4798 
 4799         m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + LCP_HEADER_LEN + len;
 4800         lh->len = htons (LCP_HEADER_LEN + len);
 4801 
 4802         if (debug) {
 4803                 log(LOG_DEBUG, SPP_FMT "%s output <%s id=0x%x len=%d",
 4804                     SPP_ARGS(ifp), cp->name,
 4805                     sppp_auth_type_name(cp->proto, lh->type),
 4806                     lh->ident, ntohs(lh->len));
 4807                 sppp_print_bytes((u_char*) (lh+1), len);
 4808                 log(-1, ">\n");
 4809         }
 4810         if (! IF_HANDOFF_ADJ(&sp->pp_cpq, m, ifp, 3))
 4811                 ifp->if_oerrors++;
 4812 }
 4813 
 4814 /*
 4815  * Flush interface queue.
 4816  */
 4817 static void
 4818 sppp_qflush(struct ifqueue *ifq)
 4819 {
 4820         struct mbuf *m, *n;
 4821 
 4822         n = ifq->ifq_head;
 4823         while ((m = n)) {
 4824                 n = m->m_act;
 4825                 m_freem (m);
 4826         }
 4827         ifq->ifq_head = 0;
 4828         ifq->ifq_tail = 0;
 4829         ifq->ifq_len = 0;
 4830 }
 4831 
 4832 /*
 4833  * Send keepalive packets, every 10 seconds.
 4834  */
 4835 static void
 4836 sppp_keepalive(void *dummy)
 4837 {
 4838         struct sppp *sp = (struct sppp*)dummy;
 4839         struct ifnet *ifp = SP2IFP(sp);
 4840         int s;
 4841 
 4842         s = splimp();
 4843         SPPP_LOCK(sp);
 4844         /* Keepalive mode disabled or channel down? */
 4845         if (! (sp->pp_flags & PP_KEEPALIVE) ||
 4846             ! (ifp->if_drv_flags & IFF_DRV_RUNNING))
 4847                 goto out;
 4848 
 4849         if (sp->pp_mode == PP_FR) {
 4850                 sppp_fr_keepalive (sp);
 4851                 goto out;
 4852         }
 4853 
 4854         /* No keepalive in PPP mode if LCP not opened yet. */
 4855         if (sp->pp_mode != IFF_CISCO &&
 4856             sp->pp_phase < PHASE_AUTHENTICATE)
 4857                 goto out;
 4858 
 4859         if (sp->pp_alivecnt == MAXALIVECNT) {
 4860                 /* No keepalive packets got.  Stop the interface. */
 4861                 printf (SPP_FMT "down\n", SPP_ARGS(ifp));
 4862                 if_down (ifp);
 4863                 sppp_qflush (&sp->pp_cpq);
 4864                 if (sp->pp_mode != IFF_CISCO) {
 4865                         /* XXX */
 4866                         /* Shut down the PPP link. */
 4867                         lcp.Down(sp);
 4868                         /* Initiate negotiation. XXX */
 4869                         lcp.Up(sp);
 4870                 }
 4871         }
 4872         if (sp->pp_alivecnt <= MAXALIVECNT)
 4873                 ++sp->pp_alivecnt;
 4874         if (sp->pp_mode == IFF_CISCO)
 4875                 sppp_cisco_send (sp, CISCO_KEEPALIVE_REQ,
 4876                          ++sp->pp_seq[IDX_LCP], sp->pp_rseq[IDX_LCP]);
 4877         else if (sp->pp_phase >= PHASE_AUTHENTICATE) {
 4878                 long nmagic = htonl (sp->lcp.magic);
 4879                 sp->lcp.echoid = ++sp->pp_seq[IDX_LCP];
 4880                 sppp_cp_send (sp, PPP_LCP, ECHO_REQ,
 4881                         sp->lcp.echoid, 4, &nmagic);
 4882         }
 4883 out:
 4884         SPPP_UNLOCK(sp);
 4885         splx(s);
 4886         callout_reset(&sp->keepalive_callout, hz * 10, sppp_keepalive,
 4887                       (void *)sp);
 4888 }
 4889 
 4890 /*
 4891  * Get both IP addresses.
 4892  */
 4893 void
 4894 sppp_get_ip_addrs(struct sppp *sp, u_long *src, u_long *dst, u_long *srcmask)
 4895 {
 4896         struct ifnet *ifp = SP2IFP(sp);
 4897         struct ifaddr *ifa;
 4898         struct sockaddr_in *si, *sm;
 4899         u_long ssrc, ddst;
 4900 
 4901         sm = NULL;
 4902         ssrc = ddst = 0L;
 4903         /*
 4904          * Pick the first AF_INET address from the list,
 4905          * aliases don't make any sense on a p2p link anyway.
 4906          */
 4907         si = 0;
 4908         if_addr_rlock(ifp);
 4909         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
 4910                 if (ifa->ifa_addr->sa_family == AF_INET) {
 4911                         si = (struct sockaddr_in *)ifa->ifa_addr;
 4912                         sm = (struct sockaddr_in *)ifa->ifa_netmask;
 4913                         if (si)
 4914                                 break;
 4915                 }
 4916         if (ifa) {
 4917                 if (si && si->sin_addr.s_addr) {
 4918                         ssrc = si->sin_addr.s_addr;
 4919                         if (srcmask)
 4920                                 *srcmask = ntohl(sm->sin_addr.s_addr);
 4921                 }
 4922 
 4923                 si = (struct sockaddr_in *)ifa->ifa_dstaddr;
 4924                 if (si && si->sin_addr.s_addr)
 4925                         ddst = si->sin_addr.s_addr;
 4926         }
 4927         if_addr_runlock(ifp);
 4928 
 4929         if (dst) *dst = ntohl(ddst);
 4930         if (src) *src = ntohl(ssrc);
 4931 }
 4932 
 4933 #ifdef INET
 4934 /*
 4935  * Set my IP address.  Must be called at splimp.
 4936  */
 4937 static void
 4938 sppp_set_ip_addr(struct sppp *sp, u_long src)
 4939 {
 4940         STDDCL;
 4941         struct ifaddr *ifa;
 4942         struct sockaddr_in *si;
 4943         struct in_ifaddr *ia;
 4944 
 4945         /*
 4946          * Pick the first AF_INET address from the list,
 4947          * aliases don't make any sense on a p2p link anyway.
 4948          */
 4949         si = 0;
 4950         if_addr_rlock(ifp);
 4951         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 4952                 if (ifa->ifa_addr->sa_family == AF_INET) {
 4953                         si = (struct sockaddr_in *)ifa->ifa_addr;
 4954                         if (si != NULL) {
 4955                                 ifa_ref(ifa);
 4956                                 break;
 4957                         }
 4958                 }
 4959         }
 4960         if_addr_runlock(ifp);
 4961 
 4962         if (ifa != NULL) {
 4963                 int error;
 4964 
 4965                 /* delete old route */
 4966                 error = rtinit(ifa, (int)RTM_DELETE, RTF_HOST);
 4967                 if (debug && error) {
 4968                         log(LOG_DEBUG, SPP_FMT "sppp_set_ip_addr: rtinit DEL failed, error=%d\n",
 4969                                 SPP_ARGS(ifp), error);
 4970                 }
 4971 
 4972                 /* set new address */
 4973                 si->sin_addr.s_addr = htonl(src);
 4974                 ia = ifatoia(ifa);
 4975                 IN_IFADDR_WLOCK();
 4976                 LIST_REMOVE(ia, ia_hash);
 4977                 LIST_INSERT_HEAD(INADDR_HASH(si->sin_addr.s_addr), ia, ia_hash);
 4978                 IN_IFADDR_WUNLOCK();
 4979 
 4980                 /* add new route */
 4981                 error = rtinit(ifa, (int)RTM_ADD, RTF_HOST);
 4982                 if (debug && error) {
 4983                         log(LOG_DEBUG, SPP_FMT "sppp_set_ip_addr: rtinit ADD failed, error=%d",
 4984                                 SPP_ARGS(ifp), error);
 4985                 }
 4986                 ifa_free(ifa);
 4987         }
 4988 }
 4989 #endif
 4990 
 4991 #ifdef INET6
 4992 /*
 4993  * Get both IPv6 addresses.
 4994  */
 4995 static void
 4996 sppp_get_ip6_addrs(struct sppp *sp, struct in6_addr *src, struct in6_addr *dst,
 4997                    struct in6_addr *srcmask)
 4998 {
 4999         struct ifnet *ifp = SP2IFP(sp);
 5000         struct ifaddr *ifa;
 5001         struct sockaddr_in6 *si, *sm;
 5002         struct in6_addr ssrc, ddst;
 5003 
 5004         sm = NULL;
 5005         bzero(&ssrc, sizeof(ssrc));
 5006         bzero(&ddst, sizeof(ddst));
 5007         /*
 5008          * Pick the first link-local AF_INET6 address from the list,
 5009          * aliases don't make any sense on a p2p link anyway.
 5010          */
 5011         si = NULL;
 5012         if_addr_rlock(ifp);
 5013         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
 5014                 if (ifa->ifa_addr->sa_family == AF_INET6) {
 5015                         si = (struct sockaddr_in6 *)ifa->ifa_addr;
 5016                         sm = (struct sockaddr_in6 *)ifa->ifa_netmask;
 5017                         if (si && IN6_IS_ADDR_LINKLOCAL(&si->sin6_addr))
 5018                                 break;
 5019                 }
 5020         if (ifa) {
 5021                 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr)) {
 5022                         bcopy(&si->sin6_addr, &ssrc, sizeof(ssrc));
 5023                         if (srcmask) {
 5024                                 bcopy(&sm->sin6_addr, srcmask,
 5025                                       sizeof(*srcmask));
 5026                         }
 5027                 }
 5028 
 5029                 si = (struct sockaddr_in6 *)ifa->ifa_dstaddr;
 5030                 if (si && !IN6_IS_ADDR_UNSPECIFIED(&si->sin6_addr))
 5031                         bcopy(&si->sin6_addr, &ddst, sizeof(ddst));
 5032         }
 5033 
 5034         if (dst)
 5035                 bcopy(&ddst, dst, sizeof(*dst));
 5036         if (src)
 5037                 bcopy(&ssrc, src, sizeof(*src));
 5038         if_addr_runlock(ifp);
 5039 }
 5040 
 5041 #ifdef IPV6CP_MYIFID_DYN
 5042 /*
 5043  * Generate random ifid.
 5044  */
 5045 static void
 5046 sppp_gen_ip6_addr(struct sppp *sp, struct in6_addr *addr)
 5047 {
 5048         /* TBD */
 5049 }
 5050 
 5051 /*
 5052  * Set my IPv6 address.  Must be called at splimp.
 5053  */
 5054 static void
 5055 sppp_set_ip6_addr(struct sppp *sp, const struct in6_addr *src)
 5056 {
 5057         STDDCL;
 5058         struct ifaddr *ifa;
 5059         struct sockaddr_in6 *sin6;
 5060 
 5061         /*
 5062          * Pick the first link-local AF_INET6 address from the list,
 5063          * aliases don't make any sense on a p2p link anyway.
 5064          */
 5065 
 5066         sin6 = NULL;
 5067         if_addr_rlock(ifp);
 5068         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 5069                 if (ifa->ifa_addr->sa_family == AF_INET6) {
 5070                         sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
 5071                         if (sin6 && IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) {
 5072                                 ifa_ref(ifa);
 5073                                 break;
 5074                         }
 5075                 }
 5076         }
 5077         if_addr_runlock(ifp);
 5078 
 5079         if (ifa != NULL) {
 5080                 int error;
 5081                 struct sockaddr_in6 new_sin6 = *sin6;
 5082 
 5083                 bcopy(src, &new_sin6.sin6_addr, sizeof(new_sin6.sin6_addr));
 5084                 error = in6_ifinit(ifp, ifatoia6(ifa), &new_sin6, 1);
 5085                 if (debug && error) {
 5086                         log(LOG_DEBUG, SPP_FMT "sppp_set_ip6_addr: in6_ifinit "
 5087                             " failed, error=%d\n", SPP_ARGS(ifp), error);
 5088                 }
 5089                 ifa_free(ifa);
 5090         }
 5091 }
 5092 #endif
 5093 
 5094 /*
 5095  * Suggest a candidate address to be used by peer.
 5096  */
 5097 static void
 5098 sppp_suggest_ip6_addr(struct sppp *sp, struct in6_addr *suggest)
 5099 {
 5100         struct in6_addr myaddr;
 5101         struct timeval tv;
 5102 
 5103         sppp_get_ip6_addrs(sp, &myaddr, 0, 0);
 5104 
 5105         myaddr.s6_addr[8] &= ~0x02;     /* u bit to "local" */
 5106         microtime(&tv);
 5107         if ((tv.tv_usec & 0xff) == 0 && (tv.tv_sec & 0xff) == 0) {
 5108                 myaddr.s6_addr[14] ^= 0xff;
 5109                 myaddr.s6_addr[15] ^= 0xff;
 5110         } else {
 5111                 myaddr.s6_addr[14] ^= (tv.tv_usec & 0xff);
 5112                 myaddr.s6_addr[15] ^= (tv.tv_sec & 0xff);
 5113         }
 5114         if (suggest)
 5115                 bcopy(&myaddr, suggest, sizeof(myaddr));
 5116 }
 5117 #endif /*INET6*/
 5118 
 5119 static int
 5120 sppp_params(struct sppp *sp, u_long cmd, void *data)
 5121 {
 5122         u_long subcmd;
 5123         struct ifreq *ifr = (struct ifreq *)data;
 5124         struct spppreq *spr;
 5125         int rv = 0;
 5126 
 5127         if ((spr = malloc(sizeof(struct spppreq), M_TEMP, M_NOWAIT)) == 0)
 5128                 return (EAGAIN);
 5129         /*
 5130          * ifr->ifr_data is supposed to point to a struct spppreq.
 5131          * Check the cmd word first before attempting to fetch all the
 5132          * data.
 5133          */
 5134         if ((subcmd = fuword(ifr->ifr_data)) == -1) {
 5135                 rv = EFAULT;
 5136                 goto quit;
 5137         }
 5138 
 5139         if (copyin((caddr_t)ifr->ifr_data, spr, sizeof(struct spppreq)) != 0) {
 5140                 rv = EFAULT;
 5141                 goto quit;
 5142         }
 5143 
 5144         switch (subcmd) {
 5145         case (u_long)SPPPIOGDEFS:
 5146                 if (cmd != SIOCGIFGENERIC) {
 5147                         rv = EINVAL;
 5148                         break;
 5149                 }
 5150                 /*
 5151                  * We copy over the entire current state, but clean
 5152                  * out some of the stuff we don't wanna pass up.
 5153                  * Remember, SIOCGIFGENERIC is unprotected, and can be
 5154                  * called by any user.  No need to ever get PAP or
 5155                  * CHAP secrets back to userland anyway.
 5156                  */
 5157                 spr->defs.pp_phase = sp->pp_phase;
 5158                 spr->defs.enable_vj = (sp->confflags & CONF_ENABLE_VJ) != 0;
 5159                 spr->defs.enable_ipv6 = (sp->confflags & CONF_ENABLE_IPV6) != 0;
 5160                 spr->defs.lcp = sp->lcp;
 5161                 spr->defs.ipcp = sp->ipcp;
 5162                 spr->defs.ipv6cp = sp->ipv6cp;
 5163                 spr->defs.myauth = sp->myauth;
 5164                 spr->defs.hisauth = sp->hisauth;
 5165                 bzero(spr->defs.myauth.secret, AUTHKEYLEN);
 5166                 bzero(spr->defs.myauth.challenge, AUTHKEYLEN);
 5167                 bzero(spr->defs.hisauth.secret, AUTHKEYLEN);
 5168                 bzero(spr->defs.hisauth.challenge, AUTHKEYLEN);
 5169                 /*
 5170                  * Fixup the LCP timeout value to milliseconds so
 5171                  * spppcontrol doesn't need to bother about the value
 5172                  * of "hz".  We do the reverse calculation below when
 5173                  * setting it.
 5174                  */
 5175                 spr->defs.lcp.timeout = sp->lcp.timeout * 1000 / hz;
 5176                 rv = copyout(spr, (caddr_t)ifr->ifr_data,
 5177                              sizeof(struct spppreq));
 5178                 break;
 5179 
 5180         case (u_long)SPPPIOSDEFS:
 5181                 if (cmd != SIOCSIFGENERIC) {
 5182                         rv = EINVAL;
 5183                         break;
 5184                 }
 5185                 /*
 5186                  * We have a very specific idea of which fields we
 5187                  * allow being passed back from userland, so to not
 5188                  * clobber our current state.  For one, we only allow
 5189                  * setting anything if LCP is in dead or establish
 5190                  * phase.  Once the authentication negotiations
 5191                  * started, the authentication settings must not be
 5192                  * changed again.  (The administrator can force an
 5193                  * ifconfig down in order to get LCP back into dead
 5194                  * phase.)
 5195                  *
 5196                  * Also, we only allow for authentication parameters to be
 5197                  * specified.
 5198                  *
 5199                  * XXX Should allow to set or clear pp_flags.
 5200                  *
 5201                  * Finally, if the respective authentication protocol to
 5202                  * be used is set differently than 0, but the secret is
 5203                  * passed as all zeros, we don't trash the existing secret.
 5204                  * This allows an administrator to change the system name
 5205                  * only without clobbering the secret (which he didn't get
 5206                  * back in a previous SPPPIOGDEFS call).  However, the
 5207                  * secrets are cleared if the authentication protocol is
 5208                  * reset to 0.  */
 5209                 if (sp->pp_phase != PHASE_DEAD &&
 5210                     sp->pp_phase != PHASE_ESTABLISH) {
 5211                         rv = EBUSY;
 5212                         break;
 5213                 }
 5214 
 5215                 if ((spr->defs.myauth.proto != 0 && spr->defs.myauth.proto != PPP_PAP &&
 5216                      spr->defs.myauth.proto != PPP_CHAP) ||
 5217                     (spr->defs.hisauth.proto != 0 && spr->defs.hisauth.proto != PPP_PAP &&
 5218                      spr->defs.hisauth.proto != PPP_CHAP)) {
 5219                         rv = EINVAL;
 5220                         break;
 5221                 }
 5222 
 5223                 if (spr->defs.myauth.proto == 0)
 5224                         /* resetting myauth */
 5225                         bzero(&sp->myauth, sizeof sp->myauth);
 5226                 else {
 5227                         /* setting/changing myauth */
 5228                         sp->myauth.proto = spr->defs.myauth.proto;
 5229                         bcopy(spr->defs.myauth.name, sp->myauth.name, AUTHNAMELEN);
 5230                         if (spr->defs.myauth.secret[0] != '\0')
 5231                                 bcopy(spr->defs.myauth.secret, sp->myauth.secret,
 5232                                       AUTHKEYLEN);
 5233                 }
 5234                 if (spr->defs.hisauth.proto == 0)
 5235                         /* resetting hisauth */
 5236                         bzero(&sp->hisauth, sizeof sp->hisauth);
 5237                 else {
 5238                         /* setting/changing hisauth */
 5239                         sp->hisauth.proto = spr->defs.hisauth.proto;
 5240                         sp->hisauth.flags = spr->defs.hisauth.flags;
 5241                         bcopy(spr->defs.hisauth.name, sp->hisauth.name, AUTHNAMELEN);
 5242                         if (spr->defs.hisauth.secret[0] != '\0')
 5243                                 bcopy(spr->defs.hisauth.secret, sp->hisauth.secret,
 5244                                       AUTHKEYLEN);
 5245                 }
 5246                 /* set LCP restart timer timeout */
 5247                 if (spr->defs.lcp.timeout != 0)
 5248                         sp->lcp.timeout = spr->defs.lcp.timeout * hz / 1000;
 5249                 /* set VJ enable and IPv6 disable flags */
 5250 #ifdef INET
 5251                 if (spr->defs.enable_vj)
 5252                         sp->confflags |= CONF_ENABLE_VJ;
 5253                 else
 5254                         sp->confflags &= ~CONF_ENABLE_VJ;
 5255 #endif
 5256 #ifdef INET6
 5257                 if (spr->defs.enable_ipv6)
 5258                         sp->confflags |= CONF_ENABLE_IPV6;
 5259                 else
 5260                         sp->confflags &= ~CONF_ENABLE_IPV6;
 5261 #endif
 5262                 break;
 5263 
 5264         default:
 5265                 rv = EINVAL;
 5266         }
 5267 
 5268  quit:
 5269         free(spr, M_TEMP);
 5270 
 5271         return (rv);
 5272 }
 5273 
 5274 static void
 5275 sppp_phase_network(struct sppp *sp)
 5276 {
 5277         STDDCL;
 5278         int i;
 5279         u_long mask;
 5280 
 5281         sp->pp_phase = PHASE_NETWORK;
 5282 
 5283         if (debug)
 5284                 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp),
 5285                     sppp_phase_name(sp->pp_phase));
 5286 
 5287         /* Notify NCPs now. */
 5288         for (i = 0; i < IDX_COUNT; i++)
 5289                 if ((cps[i])->flags & CP_NCP)
 5290                         (cps[i])->Open(sp);
 5291 
 5292         /* Send Up events to all NCPs. */
 5293         for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1)
 5294                 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_NCP))
 5295                         (cps[i])->Up(sp);
 5296 
 5297         /* if no NCP is starting, all this was in vain, close down */
 5298         sppp_lcp_check_and_close(sp);
 5299 }
 5300 
 5301 
 5302 static const char *
 5303 sppp_cp_type_name(u_char type)
 5304 {
 5305         static char buf[12];
 5306         switch (type) {
 5307         case CONF_REQ:   return "conf-req";
 5308         case CONF_ACK:   return "conf-ack";
 5309         case CONF_NAK:   return "conf-nak";
 5310         case CONF_REJ:   return "conf-rej";
 5311         case TERM_REQ:   return "term-req";
 5312         case TERM_ACK:   return "term-ack";
 5313         case CODE_REJ:   return "code-rej";
 5314         case PROTO_REJ:  return "proto-rej";
 5315         case ECHO_REQ:   return "echo-req";
 5316         case ECHO_REPLY: return "echo-reply";
 5317         case DISC_REQ:   return "discard-req";
 5318         }
 5319         snprintf (buf, sizeof(buf), "cp/0x%x", type);
 5320         return buf;
 5321 }
 5322 
 5323 static const char *
 5324 sppp_auth_type_name(u_short proto, u_char type)
 5325 {
 5326         static char buf[12];
 5327         switch (proto) {
 5328         case PPP_CHAP:
 5329                 switch (type) {
 5330                 case CHAP_CHALLENGE:    return "challenge";
 5331                 case CHAP_RESPONSE:     return "response";
 5332                 case CHAP_SUCCESS:      return "success";
 5333                 case CHAP_FAILURE:      return "failure";
 5334                 }
 5335         case PPP_PAP:
 5336                 switch (type) {
 5337                 case PAP_REQ:           return "req";
 5338                 case PAP_ACK:           return "ack";
 5339                 case PAP_NAK:           return "nak";
 5340                 }
 5341         }
 5342         snprintf (buf, sizeof(buf), "auth/0x%x", type);
 5343         return buf;
 5344 }
 5345 
 5346 static const char *
 5347 sppp_lcp_opt_name(u_char opt)
 5348 {
 5349         static char buf[12];
 5350         switch (opt) {
 5351         case LCP_OPT_MRU:               return "mru";
 5352         case LCP_OPT_ASYNC_MAP:         return "async-map";
 5353         case LCP_OPT_AUTH_PROTO:        return "auth-proto";
 5354         case LCP_OPT_QUAL_PROTO:        return "qual-proto";
 5355         case LCP_OPT_MAGIC:             return "magic";
 5356         case LCP_OPT_PROTO_COMP:        return "proto-comp";
 5357         case LCP_OPT_ADDR_COMP:         return "addr-comp";
 5358         }
 5359         snprintf (buf, sizeof(buf), "lcp/0x%x", opt);
 5360         return buf;
 5361 }
 5362 
 5363 #ifdef INET
 5364 static const char *
 5365 sppp_ipcp_opt_name(u_char opt)
 5366 {
 5367         static char buf[12];
 5368         switch (opt) {
 5369         case IPCP_OPT_ADDRESSES:        return "addresses";
 5370         case IPCP_OPT_COMPRESSION:      return "compression";
 5371         case IPCP_OPT_ADDRESS:          return "address";
 5372         }
 5373         snprintf (buf, sizeof(buf), "ipcp/0x%x", opt);
 5374         return buf;
 5375 }
 5376 #endif
 5377 
 5378 #ifdef INET6
 5379 static const char *
 5380 sppp_ipv6cp_opt_name(u_char opt)
 5381 {
 5382         static char buf[12];
 5383         switch (opt) {
 5384         case IPV6CP_OPT_IFID:           return "ifid";
 5385         case IPV6CP_OPT_COMPRESSION:    return "compression";
 5386         }
 5387         sprintf (buf, "0x%x", opt);
 5388         return buf;
 5389 }
 5390 #endif
 5391 
 5392 static const char *
 5393 sppp_state_name(int state)
 5394 {
 5395         switch (state) {
 5396         case STATE_INITIAL:     return "initial";
 5397         case STATE_STARTING:    return "starting";
 5398         case STATE_CLOSED:      return "closed";
 5399         case STATE_STOPPED:     return "stopped";
 5400         case STATE_CLOSING:     return "closing";
 5401         case STATE_STOPPING:    return "stopping";
 5402         case STATE_REQ_SENT:    return "req-sent";
 5403         case STATE_ACK_RCVD:    return "ack-rcvd";
 5404         case STATE_ACK_SENT:    return "ack-sent";
 5405         case STATE_OPENED:      return "opened";
 5406         }
 5407         return "illegal";
 5408 }
 5409 
 5410 static const char *
 5411 sppp_phase_name(enum ppp_phase phase)
 5412 {
 5413         switch (phase) {
 5414         case PHASE_DEAD:        return "dead";
 5415         case PHASE_ESTABLISH:   return "establish";
 5416         case PHASE_TERMINATE:   return "terminate";
 5417         case PHASE_AUTHENTICATE: return "authenticate";
 5418         case PHASE_NETWORK:     return "network";
 5419         }
 5420         return "illegal";
 5421 }
 5422 
 5423 static const char *
 5424 sppp_proto_name(u_short proto)
 5425 {
 5426         static char buf[12];
 5427         switch (proto) {
 5428         case PPP_LCP:   return "lcp";
 5429         case PPP_IPCP:  return "ipcp";
 5430         case PPP_PAP:   return "pap";
 5431         case PPP_CHAP:  return "chap";
 5432         case PPP_IPV6CP: return "ipv6cp";
 5433         }
 5434         snprintf(buf, sizeof(buf), "proto/0x%x", (unsigned)proto);
 5435         return buf;
 5436 }
 5437 
 5438 static void
 5439 sppp_print_bytes(const u_char *p, u_short len)
 5440 {
 5441         if (len)
 5442                 log(-1, " %*D", len, p, "-");
 5443 }
 5444 
 5445 static void
 5446 sppp_print_string(const char *p, u_short len)
 5447 {
 5448         u_char c;
 5449 
 5450         while (len-- > 0) {
 5451                 c = *p++;
 5452                 /*
 5453                  * Print only ASCII chars directly.  RFC 1994 recommends
 5454                  * using only them, but we don't rely on it.  */
 5455                 if (c < ' ' || c > '~')
 5456                         log(-1, "\\x%x", c);
 5457                 else
 5458                         log(-1, "%c", c);
 5459         }
 5460 }
 5461 
 5462 #ifdef INET
 5463 static const char *
 5464 sppp_dotted_quad(u_long addr)
 5465 {
 5466         static char s[16];
 5467         sprintf(s, "%d.%d.%d.%d",
 5468                 (int)((addr >> 24) & 0xff),
 5469                 (int)((addr >> 16) & 0xff),
 5470                 (int)((addr >> 8) & 0xff),
 5471                 (int)(addr & 0xff));
 5472         return s;
 5473 }
 5474 #endif
 5475 
 5476 static int
 5477 sppp_strnlen(u_char *p, int max)
 5478 {
 5479         int len;
 5480 
 5481         for (len = 0; len < max && *p; ++p)
 5482                 ++len;
 5483         return len;
 5484 }
 5485 
 5486 /* a dummy, used to drop uninteresting events */
 5487 static void
 5488 sppp_null(struct sppp *unused)
 5489 {
 5490         /* do just nothing */
 5491 }

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