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

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