The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]

FreeBSD/Linux Kernel Cross Reference
sys/nfsclient/bootp_subr.c

Version: -  FREEBSD  -  FREEBSD-12-STABLE  -  FREEBSD-12-0  -  FREEBSD-11-STABLE  -  FREEBSD-11-2  -  FREEBSD-11-1  -  FREEBSD-11-0  -  FREEBSD-10-STABLE  -  FREEBSD-10-4  -  FREEBSD-10-3  -  FREEBSD-10-2  -  FREEBSD-10-1  -  FREEBSD-10-0  -  FREEBSD-9-STABLE  -  FREEBSD-9-3  -  FREEBSD-9-2  -  FREEBSD-9-1  -  FREEBSD-9-0  -  FREEBSD-8-STABLE  -  FREEBSD-8-4  -  FREEBSD-8-3  -  FREEBSD-8-2  -  FREEBSD-8-1  -  FREEBSD-8-0  -  FREEBSD-7-STABLE  -  FREEBSD-7-4  -  FREEBSD-7-3  -  FREEBSD-7-2  -  FREEBSD-7-1  -  FREEBSD-7-0  -  FREEBSD-6-STABLE  -  FREEBSD-6-4  -  FREEBSD-6-3  -  FREEBSD-6-2  -  FREEBSD-6-1  -  FREEBSD-6-0  -  FREEBSD-5-STABLE  -  FREEBSD-5-5  -  FREEBSD-5-4  -  FREEBSD-5-3  -  FREEBSD-5-2  -  FREEBSD-5-1  -  FREEBSD-5-0  -  FREEBSD-4-STABLE  -  FREEBSD-3-STABLE  -  FREEBSD22  -  linux-2.6  -  linux-2.4.22  -  MK83  -  MK84  -  PLAN9  -  DFBSD  -  NETBSD  -  NETBSD5  -  NETBSD4  -  NETBSD3  -  NETBSD20  -  OPENBSD  -  xnu-517  -  xnu-792  -  xnu-792.6.70  -  xnu-1228  -  xnu-1456.1.26  -  xnu-1699.24.8  -  xnu-2050.18.24  -  OPENSOLARIS  -  minix-3-1-1 
SearchContext: -  none  -  3  -  10 

    1 /*-
    2  * Copyright (c) 1995 Gordon Ross, Adam Glass
    3  * Copyright (c) 1992 Regents of the University of California.
    4  * All rights reserved.
    5  *
    6  * This software was developed by the Computer Systems Engineering group
    7  * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
    8  * contributed to Berkeley.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  * 3. All advertising materials mentioning features or use of this software
   19  *    must display the following acknowledgement:
   20  *      This product includes software developed by the University of
   21  *      California, Lawrence Berkeley Laboratory and its contributors.
   22  * 4. Neither the name of the University nor the names of its contributors
   23  *    may be used to endorse or promote products derived from this software
   24  *    without specific prior written permission.
   25  *
   26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   36  * SUCH DAMAGE.
   37  *
   38  * based on:
   39  *      nfs/krpc_subr.c
   40  *      $NetBSD: krpc_subr.c,v 1.10 1995/08/08 20:43:43 gwr Exp $
   41  */
   42 
   43 #include <sys/cdefs.h>
   44 __FBSDID("$FreeBSD: releng/6.4/sys/nfsclient/bootp_subr.c 173165 2007-10-30 00:49:41Z sam $");
   45 
   46 #include "opt_bootp.h"
   47 
   48 #include <sys/param.h>
   49 #include <sys/systm.h>
   50 #include <sys/kernel.h>
   51 #include <sys/sockio.h>
   52 #include <sys/malloc.h>
   53 #include <sys/mount.h>
   54 #include <sys/mbuf.h>
   55 #include <sys/proc.h>
   56 #include <sys/socket.h>
   57 #include <sys/socketvar.h>
   58 #include <sys/sysctl.h>
   59 #include <sys/uio.h>
   60 
   61 #include <net/if.h>
   62 #include <net/route.h>
   63 
   64 #include <netinet/in.h>
   65 #include <net/if_types.h>
   66 #include <net/if_dl.h>
   67 
   68 #include <rpc/rpcclnt.h>
   69 
   70 #include <nfs/rpcv2.h>
   71 #include <nfs/nfsproto.h>
   72 #include <nfsclient/nfs.h>
   73 #include <nfsclient/nfsdiskless.h>
   74 #include <nfsclient/krpc.h>
   75 #include <nfs/xdr_subs.h>
   76 
   77 
   78 #define BOOTP_MIN_LEN           300     /* Minimum size of bootp udp packet */
   79 
   80 #ifndef BOOTP_SETTLE_DELAY
   81 #define BOOTP_SETTLE_DELAY 3
   82 #endif
   83 
   84 /*
   85  * What is the longest we will wait before re-sending a request?
   86  * Note this is also the frequency of "RPC timeout" messages.
   87  * The re-send loop count sup linearly to this maximum, so the
   88  * first complaint will happen after (1+2+3+4+5)=15 seconds.
   89  */
   90 #define MAX_RESEND_DELAY 5      /* seconds */
   91 
   92 /* Definitions from RFC951 */
   93 struct bootp_packet {
   94         u_int8_t op;
   95         u_int8_t htype;
   96         u_int8_t hlen;
   97         u_int8_t hops;
   98         u_int32_t xid;
   99         u_int16_t secs;
  100         u_int16_t flags;
  101         struct in_addr ciaddr;
  102         struct in_addr yiaddr;
  103         struct in_addr siaddr;
  104         struct in_addr giaddr;
  105         unsigned char chaddr[16];
  106         char sname[64];
  107         char file[128];
  108         unsigned char vend[1222];
  109 };
  110 
  111 struct bootpc_ifcontext {
  112         struct bootpc_ifcontext *next;
  113         struct bootp_packet call;
  114         struct bootp_packet reply;
  115         int replylen;
  116         int overload;
  117         struct socket *so;
  118         struct ifreq ireq;
  119         struct ifnet *ifp;
  120         struct sockaddr_dl *sdl;
  121         struct sockaddr_in myaddr;
  122         struct sockaddr_in netmask;
  123         struct sockaddr_in gw;
  124         struct sockaddr_in broadcast;   /* Different for each interface */
  125         int gotgw;
  126         int gotnetmask;
  127         int gotrootpath;
  128         int outstanding;
  129         int sentmsg;
  130         u_int32_t xid;
  131         enum {
  132                 IF_BOOTP_UNRESOLVED,
  133                 IF_BOOTP_RESOLVED,
  134                 IF_BOOTP_FAILED,
  135                 IF_DHCP_UNRESOLVED,
  136                 IF_DHCP_OFFERED,
  137                 IF_DHCP_RESOLVED,
  138                 IF_DHCP_FAILED,
  139         } state;
  140         int dhcpquerytype;              /* dhcp type sent */
  141         struct in_addr dhcpserver;
  142         int gotdhcpserver;
  143 };
  144 
  145 #define TAG_MAXLEN 1024
  146 struct bootpc_tagcontext {
  147         char buf[TAG_MAXLEN + 1];
  148         int overload;
  149         int badopt;
  150         int badtag;
  151         int foundopt;
  152         int taglen;
  153 };
  154 
  155 struct bootpc_globalcontext {
  156         struct bootpc_ifcontext *interfaces;
  157         struct bootpc_ifcontext *lastinterface;
  158         u_int32_t xid;
  159         int gotrootpath;
  160         int gotgw;
  161         int ifnum;
  162         int secs;
  163         int starttime;
  164         struct bootp_packet reply;
  165         int replylen;
  166         struct bootpc_ifcontext *setrootfs;
  167         struct bootpc_ifcontext *sethostname;
  168         struct bootpc_tagcontext tmptag;
  169         struct bootpc_tagcontext tag;
  170 };
  171 
  172 #define IPPORT_BOOTPC 68
  173 #define IPPORT_BOOTPS 67
  174 
  175 #define BOOTP_REQUEST 1
  176 #define BOOTP_REPLY 2
  177 
  178 /* Common tags */
  179 #define TAG_PAD           0  /* Pad option, implicit length 1 */
  180 #define TAG_SUBNETMASK    1  /* RFC 950 subnet mask */
  181 #define TAG_ROUTERS       3  /* Routers (in order of preference) */
  182 #define TAG_HOSTNAME     12  /* Client host name */
  183 #define TAG_ROOT         17  /* Root path */
  184 
  185 /* DHCP specific tags */
  186 #define TAG_OVERLOAD     52  /* Option Overload */
  187 #define TAG_MAXMSGSIZE   57  /* Maximum DHCP Message Size */
  188 
  189 #define TAG_END         255  /* End Option (i.e. no more options) */
  190 
  191 /* Overload values */
  192 #define OVERLOAD_FILE     1
  193 #define OVERLOAD_SNAME    2
  194 
  195 /* Site specific tags: */
  196 #define TAG_ROOTOPTS    130
  197 #define TAG_COOKIE      134     /* ascii info for userland, via sysctl */
  198 
  199 #define TAG_DHCP_MSGTYPE 53
  200 #define TAG_DHCP_REQ_ADDR 50
  201 #define TAG_DHCP_SERVERID 54
  202 #define TAG_DHCP_LEASETIME 51
  203 
  204 #define TAG_VENDOR_INDENTIFIER 60
  205 
  206 #define DHCP_NOMSG    0
  207 #define DHCP_DISCOVER 1
  208 #define DHCP_OFFER    2
  209 #define DHCP_REQUEST  3
  210 #define DHCP_ACK      5
  211 
  212 static char bootp_cookie[128];
  213 SYSCTL_STRING(_kern, OID_AUTO, bootp_cookie, CTLFLAG_RD,
  214         bootp_cookie, 0, "Cookie (T134) supplied by bootp server");
  215 
  216 /* mountd RPC */
  217 static int      md_mount(struct sockaddr_in *mdsin, char *path, u_char *fhp,
  218                     int *fhsizep, struct nfs_args *args, struct thread *td);
  219 static int      setfs(struct sockaddr_in *addr, char *path, char *p,
  220                     const struct in_addr *siaddr);
  221 static int      getdec(char **ptr);
  222 static int      getip(char **ptr, struct in_addr *ip);
  223 static void     mountopts(struct nfs_args *args, char *p);
  224 static int      xdr_opaque_decode(struct mbuf **ptr, u_char *buf, int len);
  225 static int      xdr_int_decode(struct mbuf **ptr, int *iptr);
  226 static void     print_in_addr(struct in_addr addr);
  227 static void     print_sin_addr(struct sockaddr_in *addr);
  228 static void     clear_sinaddr(struct sockaddr_in *sin);
  229 static void     allocifctx(struct bootpc_globalcontext *gctx);
  230 static void     bootpc_compose_query(struct bootpc_ifcontext *ifctx,
  231                     struct bootpc_globalcontext *gctx, struct thread *td);
  232 static unsigned char *bootpc_tag(struct bootpc_tagcontext *tctx,
  233                     struct bootp_packet *bp, int len, int tag);
  234 static void bootpc_tag_helper(struct bootpc_tagcontext *tctx,
  235                     unsigned char *start, int len, int tag);
  236 
  237 #ifdef BOOTP_DEBUG
  238 void bootpboot_p_sa(struct sockaddr *sa, struct sockaddr *ma);
  239 void bootpboot_p_ma(struct sockaddr *ma);
  240 void bootpboot_p_rtentry(struct rtentry *rt);
  241 void bootpboot_p_tree(struct radix_node *rn);
  242 void bootpboot_p_rtlist(void);
  243 void bootpboot_p_if(struct ifnet *ifp, struct ifaddr *ifa);
  244 void bootpboot_p_iflist(void);
  245 #endif
  246 
  247 static int      bootpc_call(struct bootpc_globalcontext *gctx,
  248                     struct thread *td);
  249 
  250 static int      bootpc_fakeup_interface(struct bootpc_ifcontext *ifctx,
  251                     struct bootpc_globalcontext *gctx, struct thread *td);
  252 
  253 static int      bootpc_adjust_interface(struct bootpc_ifcontext *ifctx,
  254                     struct bootpc_globalcontext *gctx, struct thread *td);
  255 
  256 static void     bootpc_decode_reply(struct nfsv3_diskless *nd,
  257                     struct bootpc_ifcontext *ifctx,
  258                     struct bootpc_globalcontext *gctx);
  259 
  260 static int      bootpc_received(struct bootpc_globalcontext *gctx,
  261                     struct bootpc_ifcontext *ifctx);
  262 
  263 static __inline int bootpc_ifctx_isresolved(struct bootpc_ifcontext *ifctx);
  264 static __inline int bootpc_ifctx_isunresolved(struct bootpc_ifcontext *ifctx);
  265 static __inline int bootpc_ifctx_isfailed(struct bootpc_ifcontext *ifctx);
  266 
  267 /*
  268  * In order to have multiple active interfaces with address 0.0.0.0
  269  * and be able to send data to a selected interface, we perform
  270  * some tricks:
  271  *
  272  *  - The 'broadcast' address is different for each interface.
  273  *
  274  *  - We temporarily add routing pointing 255.255.255.255 to the
  275  *    selected interface broadcast address, thus the packet sent
  276  *    goes to that interface.
  277  */
  278 
  279 #ifdef BOOTP_DEBUG
  280 void
  281 bootpboot_p_sa(struct sockaddr *sa, struct sockaddr *ma)
  282 {
  283 
  284         if (sa == NULL) {
  285                 printf("(sockaddr *) <null>");
  286                 return;
  287         }
  288         switch (sa->sa_family) {
  289         case AF_INET:
  290         {
  291                 struct sockaddr_in *sin;
  292 
  293                 sin = (struct sockaddr_in *) sa;
  294                 printf("inet ");
  295                 print_sin_addr(sin);
  296                 if (ma != NULL) {
  297                         sin = (struct sockaddr_in *) ma;
  298                         printf(" mask ");
  299                         print_sin_addr(sin);
  300                 }
  301         }
  302         break;
  303         case AF_LINK:
  304         {
  305                 struct sockaddr_dl *sli;
  306                 int i;
  307 
  308                 sli = (struct sockaddr_dl *) sa;
  309                 printf("link %.*s ", sli->sdl_nlen, sli->sdl_data);
  310                 for (i = 0; i < sli->sdl_alen; i++) {
  311                         if (i > 0)
  312                                 printf(":");
  313                         printf("%x", ((unsigned char *) LLADDR(sli))[i]);
  314                 }
  315         }
  316         break;
  317         default:
  318                 printf("af%d", sa->sa_family);
  319         }
  320 }
  321 
  322 void
  323 bootpboot_p_ma(struct sockaddr *ma)
  324 {
  325 
  326         if (ma == NULL) {
  327                 printf("<null>");
  328                 return;
  329         }
  330         printf("%x", *(int *)ma);
  331 }
  332 
  333 void
  334 bootpboot_p_rtentry(struct rtentry *rt)
  335 {
  336 
  337         bootpboot_p_sa(rt_key(rt), rt_mask(rt));
  338         printf(" ");
  339         bootpboot_p_ma(rt->rt_genmask);
  340         printf(" ");
  341         bootpboot_p_sa(rt->rt_gateway, NULL);
  342         printf(" ");
  343         printf("flags %x", (unsigned short) rt->rt_flags);
  344         printf(" %d", (int) rt->rt_rmx.rmx_expire);
  345         printf(" %s\n", rt->rt_ifp->if_xname);
  346 }
  347 
  348 void
  349 bootpboot_p_tree(struct radix_node *rn)
  350 {
  351 
  352         while (rn != NULL) {
  353                 if (rn->rn_bit < 0) {
  354                         if ((rn->rn_flags & RNF_ROOT) != 0) {
  355                         } else {
  356                                 bootpboot_p_rtentry((struct rtentry *) rn);
  357                         }
  358                         rn = rn->rn_dupedkey;
  359                 } else {
  360                         bootpboot_p_tree(rn->rn_left);
  361                         bootpboot_p_tree(rn->rn_right);
  362                         return;
  363                 }
  364         }
  365 }
  366 
  367 void
  368 bootpboot_p_rtlist(void)
  369 {
  370 
  371         printf("Routing table:\n");
  372         RADIX_NODE_LOCK(rt_tables[AF_INET]);    /* could sleep XXX */
  373         bootpboot_p_tree(rt_tables[AF_INET]->rnh_treetop);
  374         RADIX_NODE_UNLOCK(rt_tables[AF_INET]);
  375 }
  376 
  377 void
  378 bootpboot_p_if(struct ifnet *ifp, struct ifaddr *ifa)
  379 {
  380 
  381         printf("%s flags %x, addr ",
  382                ifp->if_xname, ifp->if_flags);
  383         print_sin_addr((struct sockaddr_in *) ifa->ifa_addr);
  384         printf(", broadcast ");
  385         print_sin_addr((struct sockaddr_in *) ifa->ifa_dstaddr);
  386         printf(", netmask ");
  387         print_sin_addr((struct sockaddr_in *) ifa->ifa_netmask);
  388         printf("\n");
  389 }
  390 
  391 void
  392 bootpboot_p_iflist(void)
  393 {
  394         struct ifnet *ifp;
  395         struct ifaddr *ifa;
  396 
  397         printf("Interface list:\n");
  398         IFNET_RLOCK(); /* could sleep, but okay for debugging XXX */
  399         for (ifp = TAILQ_FIRST(&ifnet);
  400              ifp != NULL;
  401              ifp = TAILQ_NEXT(ifp, if_link)) {
  402                 for (ifa = TAILQ_FIRST(&ifp->if_addrhead);
  403                      ifa != NULL;
  404                      ifa = TAILQ_NEXT(ifa, ifa_link))
  405                         if (ifa->ifa_addr->sa_family == AF_INET)
  406                                 bootpboot_p_if(ifp, ifa);
  407         }
  408         IFNET_RUNLOCK();
  409 }
  410 #endif /* defined(BOOTP_DEBUG) */
  411 
  412 static void
  413 clear_sinaddr(struct sockaddr_in *sin)
  414 {
  415 
  416         bzero(sin, sizeof(*sin));
  417         sin->sin_len = sizeof(*sin);
  418         sin->sin_family = AF_INET;
  419         sin->sin_addr.s_addr = INADDR_ANY; /* XXX: htonl(INAADDR_ANY) ? */
  420         sin->sin_port = 0;
  421 }
  422 
  423 static void
  424 allocifctx(struct bootpc_globalcontext *gctx)
  425 {
  426         struct bootpc_ifcontext *ifctx;
  427         ifctx = (struct bootpc_ifcontext *) malloc(sizeof(*ifctx),
  428                                                    M_TEMP, M_WAITOK | M_ZERO);
  429         if (ifctx == NULL)
  430                 panic("Failed to allocate bootp interface context structure");
  431 
  432         ifctx->xid = gctx->xid;
  433 #ifdef BOOTP_NO_DHCP
  434         ifctx->state = IF_BOOTP_UNRESOLVED;
  435 #else
  436         ifctx->state = IF_DHCP_UNRESOLVED;
  437 #endif
  438         gctx->xid += 0x100;
  439         if (gctx->interfaces != NULL)
  440                 gctx->lastinterface->next = ifctx;
  441         else
  442                 gctx->interfaces = ifctx;
  443         gctx->lastinterface = ifctx;
  444 }
  445 
  446 static __inline int
  447 bootpc_ifctx_isresolved(struct bootpc_ifcontext *ifctx)
  448 {
  449 
  450         if (ifctx->state == IF_BOOTP_RESOLVED ||
  451             ifctx->state == IF_DHCP_RESOLVED)
  452                 return 1;
  453         return 0;
  454 }
  455 
  456 static __inline int
  457 bootpc_ifctx_isunresolved(struct bootpc_ifcontext *ifctx)
  458 {
  459 
  460         if (ifctx->state == IF_BOOTP_UNRESOLVED ||
  461             ifctx->state == IF_DHCP_UNRESOLVED)
  462                 return 1;
  463         return 0;
  464 }
  465 
  466 static __inline int
  467 bootpc_ifctx_isfailed(struct bootpc_ifcontext *ifctx)
  468 {
  469 
  470         if (ifctx->state == IF_BOOTP_FAILED ||
  471             ifctx->state == IF_DHCP_FAILED)
  472                 return 1;
  473         return 0;
  474 }
  475 
  476 static int
  477 bootpc_received(struct bootpc_globalcontext *gctx,
  478     struct bootpc_ifcontext *ifctx)
  479 {
  480         unsigned char dhcpreplytype;
  481         char *p;
  482 
  483         /*
  484          * Need timeout for fallback to less
  485          * desirable alternative.
  486          */
  487 
  488         /* This call used for the side effect (badopt flag) */
  489         (void) bootpc_tag(&gctx->tmptag, &gctx->reply,
  490                           gctx->replylen,
  491                           TAG_END);
  492 
  493         /* If packet is invalid, ignore it */
  494         if (gctx->tmptag.badopt != 0)
  495                 return 0;
  496 
  497         p = bootpc_tag(&gctx->tmptag, &gctx->reply,
  498                        gctx->replylen, TAG_DHCP_MSGTYPE);
  499         if (p != NULL)
  500                 dhcpreplytype = *p;
  501         else
  502                 dhcpreplytype = DHCP_NOMSG;
  503 
  504         switch (ifctx->dhcpquerytype) {
  505         case DHCP_DISCOVER:
  506                 if (dhcpreplytype != DHCP_OFFER         /* Normal DHCP offer */
  507 #ifndef BOOTP_FORCE_DHCP
  508                     && dhcpreplytype != DHCP_NOMSG      /* Fallback to BOOTP */
  509 #endif
  510                         )
  511                         return 0;
  512                 break;
  513         case DHCP_REQUEST:
  514                 if (dhcpreplytype != DHCP_ACK)
  515                         return 0;
  516         case DHCP_NOMSG:
  517                 break;
  518         }
  519 
  520         /* Ignore packet unless it gives us a root tag we didn't have */
  521 
  522         if ((ifctx->state == IF_BOOTP_RESOLVED ||
  523              (ifctx->dhcpquerytype == DHCP_DISCOVER &&
  524               (ifctx->state == IF_DHCP_OFFERED ||
  525                ifctx->state == IF_DHCP_RESOLVED))) &&
  526             (bootpc_tag(&gctx->tmptag, &ifctx->reply,
  527                         ifctx->replylen,
  528                         TAG_ROOT) != NULL ||
  529              bootpc_tag(&gctx->tmptag, &gctx->reply,
  530                         gctx->replylen,
  531                         TAG_ROOT) == NULL))
  532                 return 0;
  533 
  534         bcopy(&gctx->reply, &ifctx->reply, gctx->replylen);
  535         ifctx->replylen = gctx->replylen;
  536 
  537         /* XXX: Only reset if 'perfect' response */
  538         if (ifctx->state == IF_BOOTP_UNRESOLVED)
  539                 ifctx->state = IF_BOOTP_RESOLVED;
  540         else if (ifctx->state == IF_DHCP_UNRESOLVED &&
  541                  ifctx->dhcpquerytype == DHCP_DISCOVER) {
  542                 if (dhcpreplytype == DHCP_OFFER)
  543                         ifctx->state = IF_DHCP_OFFERED;
  544                 else
  545                         ifctx->state = IF_BOOTP_RESOLVED;       /* Fallback */
  546         } else if (ifctx->state == IF_DHCP_OFFERED &&
  547                    ifctx->dhcpquerytype == DHCP_REQUEST)
  548                 ifctx->state = IF_DHCP_RESOLVED;
  549 
  550 
  551         if (ifctx->dhcpquerytype == DHCP_DISCOVER &&
  552             ifctx->state != IF_BOOTP_RESOLVED) {
  553                 p = bootpc_tag(&gctx->tmptag, &ifctx->reply,
  554                                ifctx->replylen, TAG_DHCP_SERVERID);
  555                 if (p != NULL && gctx->tmptag.taglen == 4) {
  556                         memcpy(&ifctx->dhcpserver, p, 4);
  557                         ifctx->gotdhcpserver = 1;
  558                 } else
  559                         ifctx->gotdhcpserver = 0;
  560                 return 1;
  561         }
  562 
  563         ifctx->gotrootpath = (bootpc_tag(&gctx->tmptag, &ifctx->reply,
  564                                          ifctx->replylen,
  565                                          TAG_ROOT) != NULL);
  566         ifctx->gotgw = (bootpc_tag(&gctx->tmptag, &ifctx->reply,
  567                                    ifctx->replylen,
  568                                    TAG_ROUTERS) != NULL);
  569         ifctx->gotnetmask = (bootpc_tag(&gctx->tmptag, &ifctx->reply,
  570                                         ifctx->replylen,
  571                                         TAG_SUBNETMASK) != NULL);
  572         return 1;
  573 }
  574 
  575 static int
  576 bootpc_call(struct bootpc_globalcontext *gctx, struct thread *td)
  577 {
  578         struct socket *so;
  579         struct sockaddr_in *sin, dst;
  580         struct uio auio;
  581         struct sockopt sopt;
  582         struct iovec aio;
  583         int error, on, rcvflg, timo, len;
  584         time_t atimo;
  585         time_t rtimo;
  586         struct timeval tv;
  587         struct bootpc_ifcontext *ifctx;
  588         int outstanding;
  589         int gotrootpath;
  590         int retry;
  591         const char *s;
  592 
  593         NET_ASSERT_GIANT();
  594 
  595         /*
  596          * Create socket and set its recieve timeout.
  597          */
  598         error = socreate(AF_INET, &so, SOCK_DGRAM, 0, td->td_ucred, td);
  599         if (error != 0)
  600                 goto out0;
  601 
  602         tv.tv_sec = 1;
  603         tv.tv_usec = 0;
  604         bzero(&sopt, sizeof(sopt));
  605         sopt.sopt_dir = SOPT_SET;
  606         sopt.sopt_level = SOL_SOCKET;
  607         sopt.sopt_name = SO_RCVTIMEO;
  608         sopt.sopt_val = &tv;
  609         sopt.sopt_valsize = sizeof tv;
  610 
  611         error = sosetopt(so, &sopt);
  612         if (error != 0)
  613                 goto out;
  614 
  615         /*
  616          * Enable broadcast.
  617          */
  618         on = 1;
  619         sopt.sopt_name = SO_BROADCAST;
  620         sopt.sopt_val = &on;
  621         sopt.sopt_valsize = sizeof on;
  622 
  623         error = sosetopt(so, &sopt);
  624         if (error != 0)
  625                 goto out;
  626 
  627         /*
  628          * Disable routing.
  629          */
  630 
  631         on = 1;
  632         sopt.sopt_name = SO_DONTROUTE;
  633         sopt.sopt_val = &on;
  634         sopt.sopt_valsize = sizeof on;
  635 
  636         error = sosetopt(so, &sopt);
  637         if (error != 0)
  638                 goto out;
  639 
  640         /*
  641          * Bind the local endpoint to a bootp client port.
  642          */
  643         sin = &dst;
  644         clear_sinaddr(sin);
  645         sin->sin_port = htons(IPPORT_BOOTPC);
  646         error = sobind(so, (struct sockaddr *)sin, td);
  647         if (error != 0) {
  648                 printf("bind failed\n");
  649                 goto out;
  650         }
  651 
  652         /*
  653          * Setup socket address for the server.
  654          */
  655         sin = &dst;
  656         clear_sinaddr(sin);
  657         sin->sin_addr.s_addr = INADDR_BROADCAST;
  658         sin->sin_port = htons(IPPORT_BOOTPS);
  659 
  660         /*
  661          * Send it, repeatedly, until a reply is received,
  662          * but delay each re-send by an increasing amount.
  663          * If the delay hits the maximum, start complaining.
  664          */
  665         timo = 0;
  666         rtimo = 0;
  667         for (;;) {
  668 
  669                 outstanding = 0;
  670                 gotrootpath = 0;
  671 
  672                 for (ifctx = gctx->interfaces;
  673                      ifctx != NULL;
  674                      ifctx = ifctx->next) {
  675                         if (bootpc_ifctx_isresolved(ifctx) != 0 &&
  676                             bootpc_tag(&gctx->tmptag, &ifctx->reply,
  677                                        ifctx->replylen,
  678                                        TAG_ROOT) != NULL)
  679                                 gotrootpath = 1;
  680                 }
  681 
  682                 for (ifctx = gctx->interfaces;
  683                      ifctx != NULL;
  684                      ifctx = ifctx->next) {
  685                         ifctx->outstanding = 0;
  686                         if (bootpc_ifctx_isresolved(ifctx)  != 0 &&
  687                             gotrootpath != 0) {
  688                                 continue;
  689                         }
  690                         if (bootpc_ifctx_isfailed(ifctx) != 0)
  691                                 continue;
  692 
  693                         outstanding++;
  694                         ifctx->outstanding = 1;
  695 
  696                         /* Proceed to next step in DHCP negotiation */
  697                         if ((ifctx->state == IF_DHCP_OFFERED &&
  698                              ifctx->dhcpquerytype != DHCP_REQUEST) ||
  699                             (ifctx->state == IF_DHCP_UNRESOLVED &&
  700                              ifctx->dhcpquerytype != DHCP_DISCOVER) ||
  701                             (ifctx->state == IF_BOOTP_UNRESOLVED &&
  702                              ifctx->dhcpquerytype != DHCP_NOMSG)) {
  703                                 ifctx->sentmsg = 0;
  704                                 bootpc_compose_query(ifctx, gctx, td);
  705                         }
  706 
  707                         /* Send BOOTP request (or re-send). */
  708 
  709                         if (ifctx->sentmsg == 0) {
  710                                 switch(ifctx->dhcpquerytype) {
  711                                 case DHCP_DISCOVER:
  712                                         s = "DHCP Discover";
  713                                         break;
  714                                 case DHCP_REQUEST:
  715                                         s = "DHCP Request";
  716                                         break;
  717                                 case DHCP_NOMSG:
  718                                 default:
  719                                         s = "BOOTP Query";
  720                                         break;
  721                                 }
  722                                 printf("Sending %s packet from "
  723                                        "interface %s (%*D)\n",
  724                                        s,
  725                                        ifctx->ireq.ifr_name,
  726                                        ifctx->sdl->sdl_alen,
  727                                        (unsigned char *) LLADDR(ifctx->sdl),
  728                                        ":");
  729                                 ifctx->sentmsg = 1;
  730                         }
  731 
  732                         aio.iov_base = (caddr_t) &ifctx->call;
  733                         aio.iov_len = sizeof(ifctx->call);
  734 
  735                         auio.uio_iov = &aio;
  736                         auio.uio_iovcnt = 1;
  737                         auio.uio_segflg = UIO_SYSSPACE;
  738                         auio.uio_rw = UIO_WRITE;
  739                         auio.uio_offset = 0;
  740                         auio.uio_resid = sizeof(ifctx->call);
  741                         auio.uio_td = td;
  742 
  743                         /* Set netmask to 0.0.0.0 */
  744 
  745                         sin = (struct sockaddr_in *) &ifctx->ireq.ifr_addr;
  746                         clear_sinaddr(sin);
  747                         error = ifioctl(ifctx->so, SIOCSIFNETMASK,
  748                                         (caddr_t) &ifctx->ireq, td);
  749                         if (error != 0)
  750                                 panic("bootpc_call:"
  751                                       "set if netmask, error=%d",
  752                                       error);
  753 
  754                         error = sosend(so, (struct sockaddr *) &dst,
  755                                        &auio, NULL, NULL, 0, td);
  756                         if (error != 0) {
  757                                 printf("bootpc_call: sosend: %d state %08x\n",
  758                                        error, (int) so->so_state);
  759                         }
  760 
  761                         /* XXX: Is this needed ? */
  762                         tsleep(&error, PZERO + 8, "bootpw", 10);
  763 
  764                         /* Set netmask to 255.0.0.0 */
  765 
  766                         sin = (struct sockaddr_in *) &ifctx->ireq.ifr_addr;
  767                         clear_sinaddr(sin);
  768                         sin->sin_addr.s_addr = htonl(0xff000000u);
  769                         error = ifioctl(ifctx->so, SIOCSIFNETMASK,
  770                                         (caddr_t) &ifctx->ireq, td);
  771                         if (error != 0)
  772                                 panic("bootpc_call:"
  773                                       "set if netmask, error=%d",
  774                                       error);
  775 
  776                 }
  777 
  778                 if (outstanding == 0 &&
  779                     (rtimo == 0 || time_second >= rtimo)) {
  780                         error = 0;
  781                         goto gotreply;
  782                 }
  783 
  784                 /* Determine new timeout. */
  785                 if (timo < MAX_RESEND_DELAY)
  786                         timo++;
  787                 else {
  788                         printf("DHCP/BOOTP timeout for server ");
  789                         print_sin_addr(&dst);
  790                         printf("\n");
  791                 }
  792 
  793                 /*
  794                  * Wait for up to timo seconds for a reply.
  795                  * The socket receive timeout was set to 1 second.
  796                  */
  797                 atimo = timo + time_second;
  798                 while (time_second < atimo) {
  799                         aio.iov_base = (caddr_t) &gctx->reply;
  800                         aio.iov_len = sizeof(gctx->reply);
  801 
  802                         auio.uio_iov = &aio;
  803                         auio.uio_iovcnt = 1;
  804                         auio.uio_segflg = UIO_SYSSPACE;
  805                         auio.uio_rw = UIO_READ;
  806                         auio.uio_offset = 0;
  807                         auio.uio_resid = sizeof(gctx->reply);
  808                         auio.uio_td = td;
  809 
  810                         rcvflg = 0;
  811                         error = soreceive(so, NULL, &auio,
  812                                           NULL, NULL, &rcvflg);
  813                         gctx->secs = time_second - gctx->starttime;
  814                         for (ifctx = gctx->interfaces;
  815                              ifctx != NULL;
  816                              ifctx = ifctx->next) {
  817                                 if (bootpc_ifctx_isresolved(ifctx) != 0 ||
  818                                     bootpc_ifctx_isfailed(ifctx) != 0)
  819                                         continue;
  820 
  821                                 ifctx->call.secs = htons(gctx->secs);
  822                         }
  823                         if (error == EWOULDBLOCK)
  824                                 continue;
  825                         if (error != 0)
  826                                 goto out;
  827                         len = sizeof(gctx->reply) - auio.uio_resid;
  828 
  829                         /* Do we have the required number of bytes ? */
  830                         if (len < BOOTP_MIN_LEN)
  831                                 continue;
  832                         gctx->replylen = len;
  833 
  834                         /* Is it a reply? */
  835                         if (gctx->reply.op != BOOTP_REPLY)
  836                                 continue;
  837 
  838                         /* Is this an answer to our query */
  839                         for (ifctx = gctx->interfaces;
  840                              ifctx != NULL;
  841                              ifctx = ifctx->next) {
  842                                 if (gctx->reply.xid != ifctx->call.xid)
  843                                         continue;
  844 
  845                                 /* Same HW address size ? */
  846                                 if (gctx->reply.hlen != ifctx->call.hlen)
  847                                         continue;
  848 
  849                                 /* Correct HW address ? */
  850                                 if (bcmp(gctx->reply.chaddr,
  851                                          ifctx->call.chaddr,
  852                                          ifctx->call.hlen) != 0)
  853                                         continue;
  854 
  855                                 break;
  856                         }
  857 
  858                         if (ifctx != NULL) {
  859                                 s =  bootpc_tag(&gctx->tmptag,
  860                                                 &gctx->reply,
  861                                                 gctx->replylen,
  862                                                 TAG_DHCP_MSGTYPE);
  863                                 if (s != NULL) {
  864                                         switch (*s) {
  865                                         case DHCP_OFFER:
  866                                                 s = "DHCP Offer";
  867                                                 break;
  868                                         case DHCP_ACK:
  869                                                 s = "DHCP Ack";
  870                                                 break;
  871                                         default:
  872                                                 s = "DHCP (unexpected)";
  873                                                 break;
  874                                         }
  875                                 } else
  876                                         s = "BOOTP Reply";
  877 
  878                                 printf("Received %s packet"
  879                                        " on %s from ",
  880                                        s,
  881                                        ifctx->ireq.ifr_name);
  882                                 print_in_addr(gctx->reply.siaddr);
  883                                 if (gctx->reply.giaddr.s_addr !=
  884                                     htonl(INADDR_ANY)) {
  885                                         printf(" via ");
  886                                         print_in_addr(gctx->reply.giaddr);
  887                                 }
  888                                 if (bootpc_received(gctx, ifctx) != 0) {
  889                                         printf(" (accepted)");
  890                                         if (ifctx->outstanding) {
  891                                                 ifctx->outstanding = 0;
  892                                                 outstanding--;
  893                                         }
  894                                         /* Network settle delay */
  895                                         if (outstanding == 0)
  896                                                 atimo = time_second +
  897                                                         BOOTP_SETTLE_DELAY;
  898                                 } else
  899                                         printf(" (ignored)");
  900                                 if (ifctx->gotrootpath) {
  901                                         gotrootpath = 1;
  902                                         rtimo = time_second +
  903                                                 BOOTP_SETTLE_DELAY;
  904                                         printf(" (got root path)");
  905                                 } else
  906                                         printf(" (no root path)");
  907                                 printf("\n");
  908                         }
  909                 } /* while secs */
  910 #ifdef BOOTP_TIMEOUT
  911                 if (gctx->secs > BOOTP_TIMEOUT && BOOTP_TIMEOUT > 0)
  912                         break;
  913 #endif
  914                 /* Force a retry if halfway in DHCP negotiation */
  915                 retry = 0;
  916                 for (ifctx = gctx->interfaces; ifctx != NULL;
  917                      ifctx = ifctx->next) {
  918                         if (ifctx->state == IF_DHCP_OFFERED) {
  919                                 if (ifctx->dhcpquerytype == DHCP_DISCOVER)
  920                                         retry = 1;
  921                                 else
  922                                         ifctx->state = IF_DHCP_UNRESOLVED;
  923                         }
  924                 }
  925 
  926                 if (retry != 0)
  927                         continue;
  928 
  929                 if (gotrootpath != 0) {
  930                         gctx->gotrootpath = gotrootpath;
  931                         if (rtimo != 0 && time_second >= rtimo)
  932                                 break;
  933                 }
  934         } /* forever send/receive */
  935 
  936         /*
  937          * XXX: These are errors of varying seriousness being silently
  938          * ignored
  939          */
  940 
  941         for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next) {
  942                 if (bootpc_ifctx_isresolved(ifctx) == 0) {
  943                         printf("%s timeout for interface %s\n",
  944                                ifctx->dhcpquerytype != DHCP_NOMSG ?
  945                                "DHCP" : "BOOTP",
  946                                ifctx->ireq.ifr_name);
  947                 }
  948         }
  949         if (gctx->gotrootpath != 0) {
  950 #if 0
  951                 printf("Got a root path, ignoring remaining timeout\n");
  952 #endif
  953                 error = 0;
  954                 goto out;
  955         }
  956 #ifndef BOOTP_NFSROOT
  957         for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next) {
  958                 if (bootpc_ifctx_isresolved(ifctx) != 0) {
  959                         error = 0;
  960                         goto out;
  961                 }
  962         }
  963 #endif
  964         error = ETIMEDOUT;
  965         goto out;
  966 
  967 gotreply:
  968 out:
  969         soclose(so);
  970 out0:
  971         return error;
  972 }
  973 
  974 static int
  975 bootpc_fakeup_interface(struct bootpc_ifcontext *ifctx,
  976     struct bootpc_globalcontext *gctx, struct thread *td)
  977 {
  978         struct sockaddr_in *sin;
  979         int error;
  980         struct ifreq *ireq;
  981         struct socket *so;
  982         struct ifaddr *ifa;
  983         struct sockaddr_dl *sdl;
  984 
  985         NET_ASSERT_GIANT();
  986 
  987         error = socreate(AF_INET, &ifctx->so, SOCK_DGRAM, 0, td->td_ucred, td);
  988         if (error != 0)
  989                 panic("nfs_boot: socreate, error=%d", error);
  990 
  991         ireq = &ifctx->ireq;
  992         so = ifctx->so;
  993 
  994         /*
  995          * Bring up the interface.
  996          *
  997          * Get the old interface flags and or IFF_UP into them; if
  998          * IFF_UP set blindly, interface selection can be clobbered.
  999          */
 1000         error = ifioctl(so, SIOCGIFFLAGS, (caddr_t)ireq, td);
 1001         if (error != 0)
 1002                 panic("bootpc_fakeup_interface: GIFFLAGS, error=%d", error);
 1003         ireq->ifr_flags |= IFF_UP;
 1004         error = ifioctl(so, SIOCSIFFLAGS, (caddr_t)ireq, td);
 1005         if (error != 0)
 1006                 panic("bootpc_fakeup_interface: SIFFLAGS, error=%d", error);
 1007 
 1008         /*
 1009          * Do enough of ifconfig(8) so that the chosen interface
 1010          * can talk to the servers.  (just set the address)
 1011          */
 1012 
 1013         /* addr is 0.0.0.0 */
 1014 
 1015         sin = (struct sockaddr_in *) &ireq->ifr_addr;
 1016         clear_sinaddr(sin);
 1017         error = ifioctl(so, SIOCSIFADDR, (caddr_t) ireq, td);
 1018         if (error != 0 && (error != EEXIST || ifctx == gctx->interfaces))
 1019                 panic("bootpc_fakeup_interface: "
 1020                       "set if addr, error=%d", error);
 1021 
 1022         /* netmask is 255.0.0.0 */
 1023 
 1024         sin = (struct sockaddr_in *) &ireq->ifr_addr;
 1025         clear_sinaddr(sin);
 1026         sin->sin_addr.s_addr = htonl(0xff000000u);
 1027         error = ifioctl(so, SIOCSIFNETMASK, (caddr_t)ireq, td);
 1028         if (error != 0)
 1029                 panic("bootpc_fakeup_interface: set if netmask, error=%d",
 1030                       error);
 1031 
 1032         /* Broadcast is 255.255.255.255 */
 1033 
 1034         sin = (struct sockaddr_in *)&ireq->ifr_addr;
 1035         clear_sinaddr(sin);
 1036         clear_sinaddr(&ifctx->broadcast);
 1037         sin->sin_addr.s_addr = htonl(INADDR_BROADCAST);
 1038         ifctx->broadcast.sin_addr.s_addr = sin->sin_addr.s_addr;
 1039 
 1040         error = ifioctl(so, SIOCSIFBRDADDR, (caddr_t)ireq, td);
 1041         if (error != 0)
 1042                 panic("bootpc_fakeup_interface: "
 1043                       "set if broadcast addr, error=%d",
 1044                       error);
 1045 
 1046         /* Get HW address */
 1047 
 1048         sdl = NULL;
 1049         for (ifa = TAILQ_FIRST(&ifctx->ifp->if_addrhead);
 1050              ifa != NULL;
 1051              ifa = TAILQ_NEXT(ifa, ifa_link))
 1052                 if (ifa->ifa_addr->sa_family == AF_LINK &&
 1053                     (sdl = ((struct sockaddr_dl *) ifa->ifa_addr)) != NULL &&
 1054                     sdl->sdl_type == IFT_ETHER)
 1055                         break;
 1056 
 1057         if (sdl == NULL)
 1058                 panic("bootpc: Unable to find HW address for %s",
 1059                       ifctx->ireq.ifr_name);
 1060         ifctx->sdl = sdl;
 1061 
 1062         return error;
 1063 }
 1064 
 1065 
 1066 static int
 1067 bootpc_adjust_interface(struct bootpc_ifcontext *ifctx,
 1068     struct bootpc_globalcontext *gctx, struct thread *td)
 1069 {
 1070         int error;
 1071         struct sockaddr_in defdst;
 1072         struct sockaddr_in defmask;
 1073         struct sockaddr_in *sin;
 1074         struct ifreq *ireq;
 1075         struct socket *so;
 1076         struct sockaddr_in *myaddr;
 1077         struct sockaddr_in *netmask;
 1078         struct sockaddr_in *gw;
 1079 
 1080         ireq = &ifctx->ireq;
 1081         so = ifctx->so;
 1082         myaddr = &ifctx->myaddr;
 1083         netmask = &ifctx->netmask;
 1084         gw = &ifctx->gw;
 1085 
 1086         if (bootpc_ifctx_isresolved(ifctx) == 0) {
 1087 
 1088                 /* Shutdown interfaces where BOOTP failed */
 1089 
 1090                 printf("Shutdown interface %s\n", ifctx->ireq.ifr_name);
 1091                 error = ifioctl(so, SIOCGIFFLAGS, (caddr_t)ireq, td);
 1092                 if (error != 0)
 1093                         panic("bootpc_adjust_interface: "
 1094                               "SIOCGIFFLAGS, error=%d", error);
 1095                 ireq->ifr_flags &= ~IFF_UP;
 1096                 error = ifioctl(so, SIOCSIFFLAGS, (caddr_t)ireq, td);
 1097                 if (error != 0)
 1098                         panic("bootpc_adjust_interface: "
 1099                               "SIOCSIFFLAGS, error=%d", error);
 1100 
 1101                 sin = (struct sockaddr_in *) &ireq->ifr_addr;
 1102                 clear_sinaddr(sin);
 1103                 error = ifioctl(so, SIOCDIFADDR, (caddr_t) ireq, td);
 1104                 if (error != 0 && (error != EEXIST ||
 1105                                    ifctx == gctx->interfaces))
 1106                         panic("bootpc_adjust_interface: "
 1107                               "SIOCDIFADDR, error=%d", error);
 1108 
 1109                 return 0;
 1110         }
 1111 
 1112         printf("Adjusted interface %s\n", ifctx->ireq.ifr_name);
 1113         /*
 1114          * Do enough of ifconfig(8) so that the chosen interface
 1115          * can talk to the servers.  (just set the address)
 1116          */
 1117         bcopy(netmask, &ireq->ifr_addr, sizeof(*netmask));
 1118         error = ifioctl(so, SIOCSIFNETMASK, (caddr_t) ireq, td);
 1119         if (error != 0)
 1120                 panic("bootpc_adjust_interface: "
 1121                       "set if netmask, error=%d", error);
 1122 
 1123         /* Broadcast is with host part of IP address all 1's */
 1124 
 1125         sin = (struct sockaddr_in *) &ireq->ifr_addr;
 1126         clear_sinaddr(sin);
 1127         sin->sin_addr.s_addr = myaddr->sin_addr.s_addr |
 1128                 ~ netmask->sin_addr.s_addr;
 1129         error = ifioctl(so, SIOCSIFBRDADDR, (caddr_t) ireq, td);
 1130         if (error != 0)
 1131                 panic("bootpc_adjust_interface: "
 1132                       "set if broadcast addr, error=%d", error);
 1133 
 1134         bcopy(myaddr, &ireq->ifr_addr, sizeof(*myaddr));
 1135         error = ifioctl(so, SIOCSIFADDR, (caddr_t) ireq, td);
 1136         if (error != 0 && (error != EEXIST || ifctx == gctx->interfaces))
 1137                 panic("bootpc_adjust_interface: "
 1138                       "set if addr, error=%d", error);
 1139 
 1140         /* Add new default route */
 1141 
 1142         if (ifctx->gotgw != 0 || gctx->gotgw == 0) {
 1143                 clear_sinaddr(&defdst);
 1144                 clear_sinaddr(&defmask);
 1145                 error = rtrequest(RTM_ADD,
 1146                                   (struct sockaddr *) &defdst,
 1147                                   (struct sockaddr *) gw,
 1148                                   (struct sockaddr *) &defmask,
 1149                                   (RTF_UP | RTF_GATEWAY | RTF_STATIC), NULL);
 1150                 if (error != 0) {
 1151                         printf("bootpc_adjust_interface: "
 1152                                "add net route, error=%d\n", error);
 1153                         return error;
 1154                 }
 1155         }
 1156 
 1157         return 0;
 1158 }
 1159 
 1160 static int
 1161 setfs(struct sockaddr_in *addr, char *path, char *p,
 1162     const struct in_addr *siaddr)
 1163 {
 1164 
 1165         if (getip(&p, &addr->sin_addr) == 0) {
 1166                 if (siaddr != NULL && *p == '/')
 1167                         bcopy(siaddr, &addr->sin_addr, sizeof(struct in_addr));
 1168                 else
 1169                         return 0;
 1170         } else {
 1171                 if (*p != ':')
 1172                         return 0;
 1173                 p++;
 1174         }
 1175                 
 1176         addr->sin_len = sizeof(struct sockaddr_in);
 1177         addr->sin_family = AF_INET;
 1178 
 1179         strlcpy(path, p, MNAMELEN);
 1180         return 1;
 1181 }
 1182 
 1183 static int
 1184 getip(char **ptr, struct in_addr *addr)
 1185 {
 1186         char *p;
 1187         unsigned int ip;
 1188         int val;
 1189 
 1190         p = *ptr;
 1191         ip = 0;
 1192         if (((val = getdec(&p)) < 0) || (val > 255))
 1193                 return 0;
 1194         ip = val << 24;
 1195         if (*p != '.')
 1196                 return 0;
 1197         p++;
 1198         if (((val = getdec(&p)) < 0) || (val > 255))
 1199                 return 0;
 1200         ip |= (val << 16);
 1201         if (*p != '.')
 1202                 return 0;
 1203         p++;
 1204         if (((val = getdec(&p)) < 0) || (val > 255))
 1205                 return 0;
 1206         ip |= (val << 8);
 1207         if (*p != '.')
 1208                 return 0;
 1209         p++;
 1210         if (((val = getdec(&p)) < 0) || (val > 255))
 1211                 return 0;
 1212         ip |= val;
 1213 
 1214         addr->s_addr = htonl(ip);
 1215         *ptr = p;
 1216         return 1;
 1217 }
 1218 
 1219 static int
 1220 getdec(char **ptr)
 1221 {
 1222         char *p;
 1223         int ret;
 1224 
 1225         p = *ptr;
 1226         ret = 0;
 1227         if ((*p < '') || (*p > '9'))
 1228                 return -1;
 1229         while ((*p >= '') && (*p <= '9')) {
 1230                 ret = ret * 10 + (*p - '');
 1231                 p++;
 1232         }
 1233         *ptr = p;
 1234         return ret;
 1235 }
 1236 
 1237 static void
 1238 mountopts(struct nfs_args *args, char *p)
 1239 {
 1240         args->version = NFS_ARGSVERSION;
 1241         args->rsize = 8192;
 1242         args->wsize = 8192;
 1243         args->flags = NFSMNT_RSIZE | NFSMNT_WSIZE | NFSMNT_RESVPORT;
 1244         args->sotype = SOCK_DGRAM;
 1245         if (p != NULL)
 1246                 nfs_parse_options(p, args);
 1247 }
 1248 
 1249 static int
 1250 xdr_opaque_decode(struct mbuf **mptr, u_char *buf, int len)
 1251 {
 1252         struct mbuf *m;
 1253         int alignedlen;
 1254 
 1255         m = *mptr;
 1256         alignedlen = ( len + 3 ) & ~3;
 1257 
 1258         if (m->m_len < alignedlen) {
 1259                 m = m_pullup(m, alignedlen);
 1260                 if (m == NULL) {
 1261                         *mptr = NULL;
 1262                         return EBADRPC;
 1263                 }
 1264         }
 1265         bcopy(mtod(m, u_char *), buf, len);
 1266         m_adj(m, alignedlen);
 1267         *mptr = m;
 1268         return 0;
 1269 }
 1270 
 1271 static int
 1272 xdr_int_decode(struct mbuf **mptr, int *iptr)
 1273 {
 1274         u_int32_t i;
 1275 
 1276         if (xdr_opaque_decode(mptr, (u_char *) &i, sizeof(u_int32_t)) != 0)
 1277                 return EBADRPC;
 1278         *iptr = fxdr_unsigned(u_int32_t, i);
 1279         return 0;
 1280 }
 1281 
 1282 static void
 1283 print_sin_addr(struct sockaddr_in *sin)
 1284 {
 1285 
 1286         print_in_addr(sin->sin_addr);
 1287 }
 1288 
 1289 static void
 1290 print_in_addr(struct in_addr addr)
 1291 {
 1292         unsigned int ip;
 1293 
 1294         ip = ntohl(addr.s_addr);
 1295         printf("%d.%d.%d.%d",
 1296                ip >> 24, (ip >> 16) & 255, (ip >> 8) & 255, ip & 255);
 1297 }
 1298 
 1299 static void
 1300 bootpc_compose_query(struct bootpc_ifcontext *ifctx,
 1301     struct bootpc_globalcontext *gctx, struct thread *td)
 1302 {
 1303         unsigned char *vendp;
 1304         unsigned char vendor_client[64];
 1305         uint32_t leasetime;
 1306         uint8_t vendor_client_len;
 1307 
 1308         ifctx->gotrootpath = 0;
 1309 
 1310         bzero((caddr_t) &ifctx->call, sizeof(ifctx->call));
 1311 
 1312         /* bootpc part */
 1313         ifctx->call.op = BOOTP_REQUEST;         /* BOOTREQUEST */
 1314         ifctx->call.htype = 1;                  /* 10mb ethernet */
 1315         ifctx->call.hlen = ifctx->sdl->sdl_alen;/* Hardware address length */
 1316         ifctx->call.hops = 0;
 1317         if (bootpc_ifctx_isunresolved(ifctx) != 0)
 1318                 ifctx->xid++;
 1319         ifctx->call.xid = txdr_unsigned(ifctx->xid);
 1320         bcopy(LLADDR(ifctx->sdl), &ifctx->call.chaddr, ifctx->sdl->sdl_alen);
 1321 
 1322         vendp = ifctx->call.vend;
 1323         *vendp++ = 99;          /* RFC1048 cookie */
 1324         *vendp++ = 130;
 1325         *vendp++ = 83;
 1326         *vendp++ = 99;
 1327         *vendp++ = TAG_MAXMSGSIZE;
 1328         *vendp++ = 2;
 1329         *vendp++ = (sizeof(struct bootp_packet) >> 8) & 255;
 1330         *vendp++ = sizeof(struct bootp_packet) & 255;
 1331 
 1332         snprintf(vendor_client, sizeof(vendor_client), "%s:%s:%s",
 1333                 ostype, MACHINE, osrelease);
 1334         vendor_client_len = strlen(vendor_client);
 1335         *vendp++ = TAG_VENDOR_INDENTIFIER;
 1336         *vendp++ = vendor_client_len;
 1337         memcpy(vendp, vendor_client, vendor_client_len);
 1338         vendp += vendor_client_len;;
 1339         ifctx->dhcpquerytype = DHCP_NOMSG;
 1340         switch (ifctx->state) {
 1341         case IF_DHCP_UNRESOLVED:
 1342                 *vendp++ = TAG_DHCP_MSGTYPE;
 1343                 *vendp++ = 1;
 1344                 *vendp++ = DHCP_DISCOVER;
 1345                 ifctx->dhcpquerytype = DHCP_DISCOVER;
 1346                 ifctx->gotdhcpserver = 0;
 1347                 break;
 1348         case IF_DHCP_OFFERED:
 1349                 *vendp++ = TAG_DHCP_MSGTYPE;
 1350                 *vendp++ = 1;
 1351                 *vendp++ = DHCP_REQUEST;
 1352                 ifctx->dhcpquerytype = DHCP_REQUEST;
 1353                 *vendp++ = TAG_DHCP_REQ_ADDR;
 1354                 *vendp++ = 4;
 1355                 memcpy(vendp, &ifctx->reply.yiaddr, 4);
 1356                 vendp += 4;
 1357                 if (ifctx->gotdhcpserver != 0) {
 1358                         *vendp++ = TAG_DHCP_SERVERID;
 1359                         *vendp++ = 4;
 1360                         memcpy(vendp, &ifctx->dhcpserver, 4);
 1361                         vendp += 4;
 1362                 }
 1363                 *vendp++ = TAG_DHCP_LEASETIME;
 1364                 *vendp++ = 4;
 1365                 leasetime = htonl(300);
 1366                 memcpy(vendp, &leasetime, 4);
 1367                 vendp += 4;
 1368                 break;
 1369         default:
 1370                 break;
 1371         }
 1372         *vendp = TAG_END;
 1373 
 1374         ifctx->call.secs = 0;
 1375         ifctx->call.flags = htons(0x8000); /* We need a broadcast answer */
 1376 }
 1377 
 1378 static int
 1379 bootpc_hascookie(struct bootp_packet *bp)
 1380 {
 1381 
 1382         return (bp->vend[0] == 99 && bp->vend[1] == 130 &&
 1383                 bp->vend[2] == 83 && bp->vend[3] == 99);
 1384 }
 1385 
 1386 static void
 1387 bootpc_tag_helper(struct bootpc_tagcontext *tctx,
 1388     unsigned char *start, int len, int tag)
 1389 {
 1390         unsigned char *j;
 1391         unsigned char *ej;
 1392         unsigned char code;
 1393 
 1394         if (tctx->badtag != 0 || tctx->badopt != 0)
 1395                 return;
 1396 
 1397         j = start;
 1398         ej = j + len;
 1399 
 1400         while (j < ej) {
 1401                 code = *j++;
 1402                 if (code == TAG_PAD)
 1403                         continue;
 1404                 if (code == TAG_END)
 1405                         return;
 1406                 if (j >= ej || j + *j + 1 > ej) {
 1407                         tctx->badopt = 1;
 1408                         return;
 1409                 }
 1410                 len = *j++;
 1411                 if (code == tag) {
 1412                         if (tctx->taglen + len > TAG_MAXLEN) {
 1413                                 tctx->badtag = 1;
 1414                                 return;
 1415                         }
 1416                         tctx->foundopt = 1;
 1417                         if (len > 0)
 1418                                 memcpy(tctx->buf + tctx->taglen,
 1419                                        j, len);
 1420                         tctx->taglen += len;
 1421                 }
 1422                 if (code == TAG_OVERLOAD)
 1423                         tctx->overload = *j;
 1424 
 1425                 j += len;
 1426         }
 1427 }
 1428 
 1429 static unsigned char *
 1430 bootpc_tag(struct bootpc_tagcontext *tctx,
 1431     struct bootp_packet *bp, int len, int tag)
 1432 {
 1433         tctx->overload = 0;
 1434         tctx->badopt = 0;
 1435         tctx->badtag = 0;
 1436         tctx->foundopt = 0;
 1437         tctx->taglen = 0;
 1438 
 1439         if (bootpc_hascookie(bp) == 0)
 1440                 return NULL;
 1441 
 1442         bootpc_tag_helper(tctx, &bp->vend[4],
 1443                           (unsigned char *) bp + len - &bp->vend[4], tag);
 1444 
 1445         if ((tctx->overload & OVERLOAD_FILE) != 0)
 1446                 bootpc_tag_helper(tctx,
 1447                                   (unsigned char *) bp->file,
 1448                                   sizeof(bp->file),
 1449                                   tag);
 1450         if ((tctx->overload & OVERLOAD_SNAME) != 0)
 1451                 bootpc_tag_helper(tctx,
 1452                                   (unsigned char *) bp->sname,
 1453                                   sizeof(bp->sname),
 1454                                   tag);
 1455 
 1456         if (tctx->badopt != 0 || tctx->badtag != 0 || tctx->foundopt == 0)
 1457                 return NULL;
 1458         tctx->buf[tctx->taglen] = '\0';
 1459         return tctx->buf;
 1460 }
 1461 
 1462 static void
 1463 bootpc_decode_reply(struct nfsv3_diskless *nd, struct bootpc_ifcontext *ifctx,
 1464     struct bootpc_globalcontext *gctx)
 1465 {
 1466         char *p;
 1467         unsigned int ip;
 1468 
 1469         ifctx->gotgw = 0;
 1470         ifctx->gotnetmask = 0;
 1471 
 1472         clear_sinaddr(&ifctx->myaddr);
 1473         clear_sinaddr(&ifctx->netmask);
 1474         clear_sinaddr(&ifctx->gw);
 1475 
 1476         ifctx->myaddr.sin_addr = ifctx->reply.yiaddr;
 1477 
 1478         ip = ntohl(ifctx->myaddr.sin_addr.s_addr);
 1479 
 1480         printf("%s at ", ifctx->ireq.ifr_name);
 1481         print_sin_addr(&ifctx->myaddr);
 1482         printf(" server ");
 1483         print_in_addr(ifctx->reply.siaddr);
 1484 
 1485         ifctx->gw.sin_addr = ifctx->reply.giaddr;
 1486         if (ifctx->reply.giaddr.s_addr != htonl(INADDR_ANY)) {
 1487                 printf(" via gateway ");
 1488                 print_in_addr(ifctx->reply.giaddr);
 1489         }
 1490 
 1491         /* This call used for the side effect (overload flag) */
 1492         (void) bootpc_tag(&gctx->tmptag,
 1493                           &ifctx->reply, ifctx->replylen, TAG_END);
 1494 
 1495         if ((gctx->tmptag.overload & OVERLOAD_SNAME) == 0)
 1496                 if (ifctx->reply.sname[0] != '\0')
 1497                         printf(" server name %s", ifctx->reply.sname);
 1498         if ((gctx->tmptag.overload & OVERLOAD_FILE) == 0)
 1499                 if (ifctx->reply.file[0] != '\0')
 1500                         printf(" boot file %s", ifctx->reply.file);
 1501 
 1502         printf("\n");
 1503 
 1504         p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
 1505                        TAG_SUBNETMASK);
 1506         if (p != NULL) {
 1507                 if (gctx->tag.taglen != 4)
 1508                         panic("bootpc: subnet mask len is %d",
 1509                               gctx->tag.taglen);
 1510                 bcopy(p, &ifctx->netmask.sin_addr, 4);
 1511                 ifctx->gotnetmask = 1;
 1512                 printf("subnet mask ");
 1513                 print_sin_addr(&ifctx->netmask);
 1514                 printf(" ");
 1515         }
 1516 
 1517         p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
 1518                        TAG_ROUTERS);
 1519         if (p != NULL) {
 1520                 /* Routers */
 1521                 if (gctx->tag.taglen % 4)
 1522                         panic("bootpc: Router Len is %d", gctx->tag.taglen);
 1523                 if (gctx->tag.taglen > 0) {
 1524                         bcopy(p, &ifctx->gw.sin_addr, 4);
 1525                         printf("router ");
 1526                         print_sin_addr(&ifctx->gw);
 1527                         printf(" ");
 1528                         ifctx->gotgw = 1;
 1529                         gctx->gotgw = 1;
 1530                 }
 1531         }
 1532 
 1533         p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
 1534                        TAG_ROOT);
 1535         if (p != NULL) {
 1536                 if (gctx->setrootfs != NULL) {
 1537                         printf("rootfs %s (ignored) ", p);
 1538                 } else  if (setfs(&nd->root_saddr,
 1539                                   nd->root_hostnam, p, &ifctx->reply.siaddr)) {
 1540                         if (*p == '/') {
 1541                                 printf("root_server ");
 1542                                 print_sin_addr(&nd->root_saddr);
 1543                                 printf(" ");
 1544                         }
 1545                         printf("rootfs %s ", p);
 1546                         gctx->gotrootpath = 1;
 1547                         ifctx->gotrootpath = 1;
 1548                         gctx->setrootfs = ifctx;
 1549 
 1550                         p = bootpc_tag(&gctx->tag, &ifctx->reply,
 1551                                        ifctx->replylen,
 1552                                        TAG_ROOTOPTS);
 1553                         if (p != NULL) {
 1554                                 mountopts(&nd->root_args, p);
 1555                                 printf("rootopts %s ", p);
 1556                         }
 1557                 } else
 1558                         panic("Failed to set rootfs to %s", p);
 1559         }
 1560 
 1561         p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
 1562                        TAG_HOSTNAME);
 1563         if (p != NULL) {
 1564                 if (gctx->tag.taglen >= MAXHOSTNAMELEN)
 1565                         panic("bootpc: hostname >= %d bytes",
 1566                               MAXHOSTNAMELEN);
 1567                 if (gctx->sethostname != NULL) {
 1568                         printf("hostname %s (ignored) ", p);
 1569                 } else {
 1570                         strcpy(nd->my_hostnam, p);
 1571                         strcpy(hostname, p);
 1572                         printf("hostname %s ", hostname);
 1573                         gctx->sethostname = ifctx;
 1574                 }
 1575         }
 1576         p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
 1577                         TAG_COOKIE);
 1578         if (p != NULL) {        /* store in a sysctl variable */
 1579                 int i, l = sizeof(bootp_cookie) - 1;
 1580                 for (i = 0; i < l && p[i] != '\0'; i++)
 1581                         bootp_cookie[i] = p[i];
 1582                 p[i] = '\0';
 1583         }
 1584 
 1585 
 1586         printf("\n");
 1587 
 1588         if (ifctx->gotnetmask == 0) {
 1589                 if (IN_CLASSA(ntohl(ifctx->myaddr.sin_addr.s_addr)))
 1590                         ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSA_NET);
 1591                 else if (IN_CLASSB(ntohl(ifctx->myaddr.sin_addr.s_addr)))
 1592                         ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSB_NET);
 1593                 else
 1594                         ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSC_NET);
 1595         }
 1596         if (ifctx->gotgw == 0) {
 1597                 /* Use proxyarp */
 1598                 ifctx->gw.sin_addr.s_addr = ifctx->myaddr.sin_addr.s_addr;
 1599         }
 1600 }
 1601 
 1602 void
 1603 bootpc_init(void)
 1604 {
 1605         struct bootpc_ifcontext *ifctx, *nctx;  /* Interface BOOTP contexts */
 1606         struct bootpc_globalcontext *gctx;      /* Global BOOTP context */
 1607         struct ifnet *ifp;
 1608         int error;
 1609 #ifndef BOOTP_WIRED_TO
 1610         int ifcnt;
 1611 #endif
 1612         struct nfsv3_diskless *nd;
 1613         struct thread *td;
 1614 
 1615         nd = &nfsv3_diskless;
 1616         td = curthread;
 1617 
 1618         /*
 1619          * If already filled in, don't touch it here
 1620          */
 1621         if (nfs_diskless_valid != 0)
 1622                 return;
 1623 
 1624         gctx = malloc(sizeof(*gctx), M_TEMP, M_WAITOK | M_ZERO);
 1625         if (gctx == NULL)
 1626                 panic("Failed to allocate bootp global context structure");
 1627 
 1628         gctx->xid = ~0xFFFF;
 1629         gctx->starttime = time_second;
 1630 
 1631         /*
 1632          * Find a network interface.
 1633          */
 1634 #ifdef BOOTP_WIRED_TO
 1635         printf("bootpc_init: wired to interface '%s'\n",
 1636                __XSTRING(BOOTP_WIRED_TO));
 1637         allocifctx(gctx);
 1638 #else
 1639         /*
 1640          * Preallocate interface context storage, if another interface
 1641          * attaches and wins the race, it won't be eligible for bootp.
 1642          */
 1643         IFNET_RLOCK();
 1644         for (ifp = TAILQ_FIRST(&ifnet), ifcnt = 0;
 1645              ifp != NULL;
 1646              ifp = TAILQ_NEXT(ifp, if_link)) {
 1647                 if ((ifp->if_flags &
 1648                      (IFF_LOOPBACK | IFF_POINTOPOINT | IFF_BROADCAST)) !=
 1649                     IFF_BROADCAST)
 1650                         continue;
 1651                 ifcnt++;
 1652         }
 1653         IFNET_RUNLOCK();
 1654         if (ifcnt == 0)
 1655                 panic("bootpc_init: no eligible interfaces");
 1656         for (; ifcnt > 0; ifcnt--)
 1657                 allocifctx(gctx);
 1658 #endif
 1659 
 1660         IFNET_RLOCK();
 1661         for (ifp = TAILQ_FIRST(&ifnet), ifctx = gctx->interfaces;
 1662              ifp != NULL && ifctx != NULL;
 1663              ifp = TAILQ_NEXT(ifp, if_link)) {
 1664                 strlcpy(ifctx->ireq.ifr_name, ifp->if_xname,
 1665                     sizeof(ifctx->ireq.ifr_name));
 1666 #ifdef BOOTP_WIRED_TO
 1667                 if (strcmp(ifctx->ireq.ifr_name,
 1668                            __XSTRING(BOOTP_WIRED_TO)) != 0)
 1669                         continue;
 1670 #else
 1671                 if ((ifp->if_flags &
 1672                      (IFF_LOOPBACK | IFF_POINTOPOINT | IFF_BROADCAST)) !=
 1673                     IFF_BROADCAST)
 1674                         continue;
 1675 #endif
 1676                 ifctx->ifp = ifp;
 1677                 ifctx = ifctx->next;
 1678         }
 1679         IFNET_RUNLOCK();
 1680 
 1681         if (gctx->interfaces == NULL || gctx->interfaces->ifp == NULL) {
 1682 #ifdef BOOTP_WIRED_TO
 1683                 panic("bootpc_init: Could not find interface specified "
 1684                       "by BOOTP_WIRED_TO: "
 1685                       __XSTRING(BOOTP_WIRED_TO));
 1686 #else
 1687                 panic("bootpc_init: no suitable interface");
 1688 #endif
 1689         }
 1690 
 1691         for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next)
 1692                 bootpc_fakeup_interface(ifctx, gctx, td);
 1693 
 1694         for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next)
 1695                 bootpc_compose_query(ifctx, gctx, td);
 1696 
 1697         error = bootpc_call(gctx, td);
 1698 
 1699         if (error != 0) {
 1700 #ifdef BOOTP_NFSROOT
 1701                 panic("BOOTP call failed");
 1702 #else
 1703                 printf("BOOTP call failed\n");
 1704 #endif
 1705         }
 1706 
 1707         rootdevnames[0] = "nfs:";
 1708         mountopts(&nd->root_args, NULL);
 1709 
 1710         for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next)
 1711                 if (bootpc_ifctx_isresolved(ifctx) != 0)
 1712                         bootpc_decode_reply(nd, ifctx, gctx);
 1713 
 1714 #ifdef BOOTP_NFSROOT
 1715         if (gctx->gotrootpath == 0)
 1716                 panic("bootpc: No root path offered");
 1717 #endif
 1718 
 1719         for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next) {
 1720                 bootpc_adjust_interface(ifctx, gctx, td);
 1721 
 1722                 soclose(ifctx->so);
 1723         }
 1724 
 1725         for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next)
 1726                 if (ifctx->gotrootpath != 0)
 1727                         break;
 1728         if (ifctx == NULL) {
 1729                 for (ifctx = gctx->interfaces;
 1730                      ifctx != NULL;
 1731                      ifctx = ifctx->next)
 1732                         if (bootpc_ifctx_isresolved(ifctx) != 0)
 1733                                 break;
 1734         }
 1735         if (ifctx == NULL)
 1736                 goto out;
 1737 
 1738         if (gctx->gotrootpath != 0) {
 1739 
 1740                 setenv("boot.netif.name", ifctx->ifp->if_xname);
 1741 
 1742                 error = md_mount(&nd->root_saddr, nd->root_hostnam,
 1743                                  nd->root_fh, &nd->root_fhsize,
 1744                                  &nd->root_args, td);
 1745                 if (error != 0)
 1746                         panic("nfs_boot: mountd root, error=%d", error);
 1747 
 1748                 nfs_diskless_valid = 3;
 1749         }
 1750 
 1751         strcpy(nd->myif.ifra_name, ifctx->ireq.ifr_name);
 1752         bcopy(&ifctx->myaddr, &nd->myif.ifra_addr, sizeof(ifctx->myaddr));
 1753         bcopy(&ifctx->myaddr, &nd->myif.ifra_broadaddr, sizeof(ifctx->myaddr));
 1754         ((struct sockaddr_in *) &nd->myif.ifra_broadaddr)->sin_addr.s_addr =
 1755                 ifctx->myaddr.sin_addr.s_addr |
 1756                 ~ ifctx->netmask.sin_addr.s_addr;
 1757         bcopy(&ifctx->netmask, &nd->myif.ifra_mask, sizeof(ifctx->netmask));
 1758 
 1759 out:
 1760         for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = nctx) {
 1761                 nctx = ifctx->next;
 1762                 free(ifctx, M_TEMP);
 1763         }
 1764         free(gctx, M_TEMP);
 1765 }
 1766 
 1767 /*
 1768  * RPC: mountd/mount
 1769  * Given a server pathname, get an NFS file handle.
 1770  * Also, sets sin->sin_port to the NFS service port.
 1771  */
 1772 static int
 1773 md_mount(struct sockaddr_in *mdsin, char *path, u_char *fhp, int *fhsizep,
 1774     struct nfs_args *args, struct thread *td)
 1775 {
 1776         struct mbuf *m;
 1777         int error;
 1778         int authunixok;
 1779         int authcount;
 1780         int authver;
 1781 
 1782         /* XXX honor v2/v3 flags in args->flags? */
 1783 #ifdef BOOTP_NFSV3
 1784         /* First try NFS v3 */
 1785         /* Get port number for MOUNTD. */
 1786         error = krpc_portmap(mdsin, RPCPROG_MNT, RPCMNT_VER3,
 1787                              &mdsin->sin_port, td);
 1788         if (error == 0) {
 1789                 m = xdr_string_encode(path, strlen(path));
 1790 
 1791                 /* Do RPC to mountd. */
 1792                 error = krpc_call(mdsin, RPCPROG_MNT, RPCMNT_VER3,
 1793                                   RPCMNT_MOUNT, &m, NULL, td);
 1794         }
 1795         if (error == 0) {
 1796                 args->flags |= NFSMNT_NFSV3;
 1797         } else {
 1798 #endif
 1799                 /* Fallback to NFS v2 */
 1800 
 1801                 /* Get port number for MOUNTD. */
 1802                 error = krpc_portmap(mdsin, RPCPROG_MNT, RPCMNT_VER1,
 1803                                      &mdsin->sin_port, td);
 1804                 if (error != 0)
 1805                         return error;
 1806 
 1807                 m = xdr_string_encode(path, strlen(path));
 1808 
 1809                 /* Do RPC to mountd. */
 1810                 error = krpc_call(mdsin, RPCPROG_MNT, RPCMNT_VER1,
 1811                                   RPCMNT_MOUNT, &m, NULL, td);
 1812                 if (error != 0)
 1813                         return error;   /* message already freed */
 1814 
 1815 #ifdef BOOTP_NFSV3
 1816         }
 1817 #endif
 1818 
 1819         if (xdr_int_decode(&m, &error) != 0 || error != 0)
 1820                 goto bad;
 1821 
 1822         if ((args->flags & NFSMNT_NFSV3) != 0) {
 1823                 if (xdr_int_decode(&m, fhsizep) != 0 ||
 1824                     *fhsizep > NFSX_V3FHMAX ||
 1825                     *fhsizep <= 0)
 1826                         goto bad;
 1827         } else
 1828                 *fhsizep = NFSX_V2FH;
 1829 
 1830         if (xdr_opaque_decode(&m, fhp, *fhsizep) != 0)
 1831                 goto bad;
 1832 
 1833         if (args->flags & NFSMNT_NFSV3) {
 1834                 if (xdr_int_decode(&m, &authcount) != 0)
 1835                         goto bad;
 1836                 authunixok = 0;
 1837                 if (authcount < 0 || authcount > 100)
 1838                         goto bad;
 1839                 while (authcount > 0) {
 1840                         if (xdr_int_decode(&m, &authver) != 0)
 1841                                 goto bad;
 1842                         if (authver == RPCAUTH_UNIX)
 1843                                 authunixok = 1;
 1844                         authcount--;
 1845                 }
 1846                 if (authunixok == 0)
 1847                         goto bad;
 1848         }
 1849 
 1850         /* Set port number for NFS use. */
 1851         error = krpc_portmap(mdsin, NFS_PROG,
 1852                              (args->flags &
 1853                               NFSMNT_NFSV3) ? NFS_VER3 : NFS_VER2,
 1854                              &mdsin->sin_port, td);
 1855 
 1856         goto out;
 1857 
 1858 bad:
 1859         error = EBADRPC;
 1860 
 1861 out:
 1862         m_freem(m);
 1863         return error;
 1864 }
 1865 
 1866 SYSINIT(bootp_rootconf, SI_SUB_ROOT_CONF, SI_ORDER_FIRST, bootpc_init, NULL);

Cache object: b19ed496d7ce8a46404547a6c037df27


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]


This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.