The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/netinet6/ah_output.c

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    1 /*      $NetBSD: ah_output.c,v 1.24 2003/09/07 15:59:36 itojun Exp $    */
    2 /*      $KAME: ah_output.c,v 1.31 2001/07/26 06:53:15 jinmei Exp $      */
    3 
    4 /*
    5  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
    6  * All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 3. Neither the name of the project nor the names of its contributors
   17  *    may be used to endorse or promote products derived from this software
   18  *    without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  */
   32 
   33 /*
   34  * RFC1826/2402 authentication header.
   35  */
   36 
   37 #include <sys/cdefs.h>
   38 __KERNEL_RCSID(0, "$NetBSD: ah_output.c,v 1.24 2003/09/07 15:59:36 itojun Exp $");
   39 
   40 #include "opt_inet.h"
   41 
   42 #include <sys/param.h>
   43 #include <sys/systm.h>
   44 #include <sys/malloc.h>
   45 #include <sys/mbuf.h>
   46 #include <sys/domain.h>
   47 #include <sys/protosw.h>
   48 #include <sys/socket.h>
   49 #include <sys/socketvar.h>
   50 #include <sys/errno.h>
   51 #include <sys/time.h>
   52 #include <sys/kernel.h>
   53 #include <sys/syslog.h>
   54 
   55 #include <net/if.h>
   56 #include <net/route.h>
   57 
   58 #include <netinet/in.h>
   59 
   60 #include <netinet/in_systm.h>
   61 #include <netinet/ip.h>
   62 #include <netinet/in_var.h>
   63 
   64 #ifdef INET6
   65 #include <netinet/ip6.h>
   66 #include <netinet6/ip6_var.h>
   67 #include <netinet/icmp6.h>
   68 #endif
   69 
   70 #include <netinet6/ipsec.h>
   71 #include <netinet6/ah.h>
   72 #include <netkey/key.h>
   73 #include <netkey/keydb.h>
   74 
   75 #include <net/net_osdep.h>
   76 
   77 #ifdef INET
   78 static struct in_addr *ah4_finaldst __P((struct mbuf *));
   79 #endif
   80 
   81 /*
   82  * compute AH header size.
   83  * transport mode only.  for tunnel mode, we should implement
   84  * virtual interface, and control MTU/MSS by the interface MTU.
   85  */
   86 size_t
   87 ah_hdrsiz(isr)
   88         struct ipsecrequest *isr;
   89 {
   90         const struct ah_algorithm *algo;
   91         size_t hdrsiz;
   92 
   93         /* sanity check */
   94         if (isr == NULL)
   95                 panic("ah_hdrsiz: NULL was passed.");
   96 
   97         if (isr->saidx.proto != IPPROTO_AH)
   98                 panic("unsupported mode passed to ah_hdrsiz");
   99 
  100         if (isr->sav == NULL)
  101                 goto estimate;
  102         if (isr->sav->state != SADB_SASTATE_MATURE
  103          && isr->sav->state != SADB_SASTATE_DYING)
  104                 goto estimate;
  105 
  106         /* we need transport mode AH. */
  107         algo = ah_algorithm_lookup(isr->sav->alg_auth);
  108         if (!algo)
  109                 goto estimate;
  110 
  111         /*
  112          * XXX
  113          * right now we don't calcurate the padding size.  simply
  114          * treat the padding size as constant, for simplicity.
  115          *
  116          * XXX variable size padding support
  117          */
  118         hdrsiz = (((*algo->sumsiz)(isr->sav) + 3) & ~(4 - 1));
  119         if (isr->sav->flags & SADB_X_EXT_OLD)
  120                 hdrsiz += sizeof(struct ah);
  121         else
  122                 hdrsiz += sizeof(struct newah);
  123 
  124         return hdrsiz;
  125 
  126     estimate:
  127         /* ASSUMING:
  128          *      sizeof(struct newah) > sizeof(struct ah).
  129          *      AH_MAXSUMSIZE is multiple of 4.
  130          */
  131         return sizeof(struct newah) + AH_MAXSUMSIZE;
  132 }
  133 
  134 #ifdef INET
  135 /*
  136  * Modify the packet so that it includes the authentication data.
  137  * The mbuf passed must start with IPv4 header.
  138  *
  139  * assumes that the first mbuf contains IPv4 header + option only.
  140  * the function does not modify m.
  141  */
  142 int
  143 ah4_output(m, isr)
  144         struct mbuf *m;
  145         struct ipsecrequest *isr;
  146 {
  147         struct secasvar *sav = isr->sav;
  148         const struct ah_algorithm *algo;
  149         u_int32_t spi;
  150         u_char *ahdrpos;
  151         u_int8_t *ahsumpos = NULL;
  152         size_t hlen = 0;        /* IP header+option in bytes */
  153         size_t plen = 0;        /* AH payload size in bytes */
  154         size_t ahlen = 0;       /* plen + sizeof(ah) */
  155         struct ip *ip;
  156         struct in_addr dst;
  157         struct in_addr *finaldst;
  158         int error;
  159 
  160         /* sanity checks */
  161         if ((sav->flags & SADB_X_EXT_OLD) == 0 && !sav->replay) {
  162                 struct ip *ip;
  163 
  164                 ip = mtod(m, struct ip *);
  165                 ipseclog((LOG_DEBUG, "ah4_output: internal error: "
  166                         "sav->replay is null: %x->%x, SPI=%u\n",
  167                         (u_int32_t)ntohl(ip->ip_src.s_addr),
  168                         (u_int32_t)ntohl(ip->ip_dst.s_addr),
  169                         (u_int32_t)ntohl(sav->spi)));
  170                 ipsecstat.out_inval++;
  171                 m_freem(m);
  172                 return EINVAL;
  173         }
  174 
  175         algo = ah_algorithm_lookup(sav->alg_auth);
  176         if (!algo) {
  177                 ipseclog((LOG_ERR, "ah4_output: unsupported algorithm: "
  178                     "SPI=%u\n", (u_int32_t)ntohl(sav->spi)));
  179                 ipsecstat.out_inval++;
  180                 m_freem(m);
  181                 return EINVAL;
  182         }
  183         spi = sav->spi;
  184 
  185         /*
  186          * determine the size to grow.
  187          */
  188         if (sav->flags & SADB_X_EXT_OLD) {
  189                 /* RFC 1826 */
  190                 plen = ((*algo->sumsiz)(sav) + 3) & ~(4 - 1); /* XXX pad to 8byte? */
  191                 ahlen = plen + sizeof(struct ah);
  192         } else {
  193                 /* RFC 2402 */
  194                 plen = ((*algo->sumsiz)(sav) + 3) & ~(4 - 1); /* XXX pad to 8byte? */
  195                 ahlen = plen + sizeof(struct newah);
  196         }
  197 
  198         /*
  199          * grow the mbuf to accomodate AH.
  200          */
  201         ip = mtod(m, struct ip *);
  202         hlen = ip->ip_hl << 2;
  203 
  204         if (m->m_len != hlen)
  205                 panic("ah4_output: assumption failed (first mbuf length)");
  206         if (M_LEADINGSPACE(m->m_next) < ahlen) {
  207                 struct mbuf *n;
  208                 MGET(n, M_DONTWAIT, MT_DATA);
  209                 if (!n) {
  210                         ipseclog((LOG_DEBUG, "ENOBUFS in ah4_output %d\n",
  211                             __LINE__));
  212                         m_freem(m);
  213                         return ENOBUFS;
  214                 }
  215                 n->m_len = ahlen;
  216                 n->m_next = m->m_next;
  217                 m->m_next = n;
  218                 m->m_pkthdr.len += ahlen;
  219                 ahdrpos = mtod(n, u_char *);
  220         } else {
  221                 m->m_next->m_len += ahlen;
  222                 m->m_next->m_data -= ahlen;
  223                 m->m_pkthdr.len += ahlen;
  224                 ahdrpos = mtod(m->m_next, u_char *);
  225         }
  226 
  227         ip = mtod(m, struct ip *);      /* just to be sure */
  228 
  229         /*
  230          * initialize AH.
  231          */
  232         if (sav->flags & SADB_X_EXT_OLD) {
  233                 struct ah *ahdr;
  234 
  235                 ahdr = (struct ah *)ahdrpos;
  236                 ahsumpos = (u_char *)(ahdr + 1);
  237                 ahdr->ah_len = plen >> 2;
  238                 ahdr->ah_nxt = ip->ip_p;
  239                 ahdr->ah_reserve = htons(0);
  240                 ahdr->ah_spi = spi;
  241                 bzero(ahdr + 1, plen);
  242         } else {
  243                 struct newah *ahdr;
  244 
  245                 ahdr = (struct newah *)ahdrpos;
  246                 ahsumpos = (u_char *)(ahdr + 1);
  247                 ahdr->ah_len = (plen >> 2) + 1; /* plus one for seq# */
  248                 ahdr->ah_nxt = ip->ip_p;
  249                 ahdr->ah_reserve = htons(0);
  250                 ahdr->ah_spi = spi;
  251                 if (sav->replay->count == ~0) {
  252                         if ((sav->flags & SADB_X_EXT_CYCSEQ) == 0) {
  253                                 /* XXX Is it noisy ? */
  254                                 ipseclog((LOG_WARNING,
  255                                     "replay counter overflowed. %s\n",
  256                                     ipsec_logsastr(sav)));
  257                                 ipsecstat.out_inval++;
  258                                 m_freem(m);
  259                                 return EINVAL;
  260                         }
  261                 }
  262                 sav->replay->count++;
  263                 /*
  264                  * XXX sequence number must not be cycled, if the SA is
  265                  * installed by IKE daemon.
  266                  */
  267                 ahdr->ah_seq = htonl(sav->replay->count & 0xffffffff);
  268                 bzero(ahdr + 1, plen);
  269         }
  270 
  271         /*
  272          * modify IPv4 header.
  273          */
  274         ip->ip_p = IPPROTO_AH;
  275         if (ahlen < (IP_MAXPACKET - ntohs(ip->ip_len)))
  276                 ip->ip_len = htons(ntohs(ip->ip_len) + ahlen);
  277         else {
  278                 ipseclog((LOG_ERR, "IPv4 AH output: size exceeds limit\n"));
  279                 ipsecstat.out_inval++;
  280                 m_freem(m);
  281                 return EMSGSIZE;
  282         }
  283 
  284         /*
  285          * If there is source routing option, update destination field in
  286          * the IPv4 header to the final destination.
  287          * Note that we do not need to update source routing option itself
  288          * (as done in IPv4 AH processing -- see ip6_output()), since
  289          * source routing option is not part of the ICV computation.
  290          */
  291         finaldst = ah4_finaldst(m);
  292         if (finaldst) {
  293                 dst.s_addr = ip->ip_dst.s_addr;
  294                 ip->ip_dst.s_addr = finaldst->s_addr;
  295         }
  296 
  297         /*
  298          * calcurate the checksum, based on security association
  299          * and the algorithm specified.
  300          */
  301         error = ah4_calccksum(m, ahsumpos, plen, algo, sav);
  302         if (error) {
  303                 ipseclog((LOG_ERR,
  304                     "error after ah4_calccksum, called from ah4_output"));
  305                 m_freem(m);
  306                 m = NULL;
  307                 ipsecstat.out_inval++;
  308                 return error;
  309         }
  310 
  311         if (finaldst) {
  312                 ip = mtod(m, struct ip *);      /* just to make sure */
  313                 ip->ip_dst.s_addr = dst.s_addr;
  314         }
  315         ipsecstat.out_success++;
  316         ipsecstat.out_ahhist[sav->alg_auth]++;
  317         key_sa_recordxfer(sav, m);
  318 
  319         return 0;
  320 }
  321 #endif
  322 
  323 /* Calculate AH length */
  324 int
  325 ah_hdrlen(sav)
  326         struct secasvar *sav;
  327 {
  328         const struct ah_algorithm *algo;
  329         int plen, ahlen;
  330 
  331         algo = ah_algorithm_lookup(sav->alg_auth);
  332         if (!algo)
  333                 return 0;
  334         if (sav->flags & SADB_X_EXT_OLD) {
  335                 /* RFC 1826 */
  336                 plen = ((*algo->sumsiz)(sav) + 3) & ~(4 - 1);   /* XXX pad to 8byte? */
  337                 ahlen = plen + sizeof(struct ah);
  338         } else {
  339                 /* RFC 2402 */
  340                 plen = ((*algo->sumsiz)(sav) + 3) & ~(4 - 1);   /* XXX pad to 8byte? */
  341                 ahlen = plen + sizeof(struct newah);
  342         }
  343 
  344         return (ahlen);
  345 }
  346 
  347 #ifdef INET6
  348 /*
  349  * Fill in the Authentication Header and calculate checksum.
  350  */
  351 int
  352 ah6_output(m, nexthdrp, md, isr)
  353         struct mbuf *m;
  354         u_char *nexthdrp;
  355         struct mbuf *md;
  356         struct ipsecrequest *isr;
  357 {
  358         struct mbuf *mprev;
  359         struct mbuf *mah;
  360         struct secasvar *sav = isr->sav;
  361         const struct ah_algorithm *algo;
  362         u_int32_t spi;
  363         u_int8_t *ahsumpos = NULL;
  364         size_t plen;    /* AH payload size in bytes */
  365         int error = 0;
  366         int ahlen;
  367         struct ip6_hdr *ip6;
  368 
  369         if (m->m_len < sizeof(struct ip6_hdr)) {
  370                 ipseclog((LOG_DEBUG, "ah6_output: first mbuf too short\n"));
  371                 m_freem(m);
  372                 return EINVAL;
  373         }
  374 
  375         ahlen = ah_hdrlen(sav);
  376         if (ahlen == 0)
  377                 return 0;
  378 
  379         for (mprev = m; mprev && mprev->m_next != md; mprev = mprev->m_next)
  380                 ;
  381         if (!mprev || mprev->m_next != md) {
  382                 ipseclog((LOG_DEBUG, "ah6_output: md is not in chain\n"));
  383                 m_freem(m);
  384                 return EINVAL;
  385         }
  386 
  387         MGET(mah, M_DONTWAIT, MT_DATA);
  388         if (!mah) {
  389                 m_freem(m);
  390                 return ENOBUFS;
  391         }
  392         if (ahlen > MLEN) {
  393                 MCLGET(mah, M_DONTWAIT);
  394                 if ((mah->m_flags & M_EXT) == 0) {
  395                         m_free(mah);
  396                         m_freem(m);
  397                         return ENOBUFS;
  398                 }
  399         }
  400         mah->m_len = ahlen;
  401         mah->m_next = md;
  402         mprev->m_next = mah;
  403         m->m_pkthdr.len += ahlen;
  404 
  405         /* fix plen */
  406         if (m->m_pkthdr.len - sizeof(struct ip6_hdr) > IPV6_MAXPACKET) {
  407                 ipseclog((LOG_ERR,
  408                     "ah6_output: AH with IPv6 jumbogram is not supported\n"));
  409                 m_freem(m);
  410                 return EINVAL;
  411         }
  412         ip6 = mtod(m, struct ip6_hdr *);
  413         ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr));
  414 
  415         if ((sav->flags & SADB_X_EXT_OLD) == 0 && !sav->replay) {
  416                 ipseclog((LOG_DEBUG, "ah6_output: internal error: "
  417                         "sav->replay is null: SPI=%u\n",
  418                         (u_int32_t)ntohl(sav->spi)));
  419                 ipsec6stat.out_inval++;
  420                 m_freem(m);
  421                 return EINVAL;
  422         }
  423 
  424         algo = ah_algorithm_lookup(sav->alg_auth);
  425         if (!algo) {
  426                 ipseclog((LOG_ERR, "ah6_output: unsupported algorithm: "
  427                     "SPI=%u\n", (u_int32_t)ntohl(sav->spi)));
  428                 ipsec6stat.out_inval++;
  429                 m_freem(m);
  430                 return EINVAL;
  431         }
  432         spi = sav->spi;
  433 
  434         /*
  435          * initialize AH.
  436          */
  437         if (sav->flags & SADB_X_EXT_OLD) {
  438                 struct ah *ahdr = mtod(mah, struct ah *);
  439 
  440                 plen = mah->m_len - sizeof(struct ah);
  441                 ahsumpos = (u_char *)(ahdr + 1);
  442                 ahdr->ah_nxt = *nexthdrp;
  443                 *nexthdrp = IPPROTO_AH;
  444                 ahdr->ah_len = plen >> 2;
  445                 ahdr->ah_reserve = htons(0);
  446                 ahdr->ah_spi = spi;
  447                 bzero(ahdr + 1, plen);
  448         } else {
  449                 struct newah *ahdr = mtod(mah, struct newah *);
  450 
  451                 plen = mah->m_len - sizeof(struct newah);
  452                 ahsumpos = (u_char *)(ahdr + 1);
  453                 ahdr->ah_nxt = *nexthdrp;
  454                 *nexthdrp = IPPROTO_AH;
  455                 ahdr->ah_len = (plen >> 2) + 1; /* plus one for seq# */
  456                 ahdr->ah_reserve = htons(0);
  457                 ahdr->ah_spi = spi;
  458                 if (sav->replay->count == ~0) {
  459                         if ((sav->flags & SADB_X_EXT_CYCSEQ) == 0) {
  460                                 /* XXX Is it noisy ? */
  461                                 ipseclog((LOG_WARNING,
  462                                     "replay counter overflowed. %s\n",
  463                                     ipsec_logsastr(sav)));
  464                                 ipsec6stat.out_inval++;
  465                                 m_freem(m);
  466                                 return EINVAL;
  467                         }
  468                 }
  469                 sav->replay->count++;
  470                 /*
  471                  * XXX sequence number must not be cycled, if the SA is
  472                  * installed by IKE daemon.
  473                  */
  474                 ahdr->ah_seq = htonl(sav->replay->count);
  475                 bzero(ahdr + 1, plen);
  476         }
  477 
  478         /*
  479          * calcurate the checksum, based on security association
  480          * and the algorithm specified.
  481          */
  482         error = ah6_calccksum(m, ahsumpos, plen, algo, sav);
  483         if (error) {
  484                 ipsec6stat.out_inval++;
  485                 m_freem(m);
  486         } else {
  487                 ipsec6stat.out_success++;
  488                 key_sa_recordxfer(sav, m);
  489         }
  490         ipsec6stat.out_ahhist[sav->alg_auth]++;
  491 
  492         return (error);
  493 }
  494 #endif
  495 
  496 #ifdef INET
  497 /*
  498  * Find the final destination if there is loose/strict source routing option.
  499  * Returns NULL if there's no source routing options.
  500  * Returns NULL on errors too.
  501  * Note that this function will return a pointer INTO the given parameter,
  502  * struct mbuf *m.
  503  * The mbuf must be pulled up toward, at least, ip option part.
  504  */
  505 static struct in_addr *
  506 ah4_finaldst(m)
  507         struct mbuf *m;
  508 {
  509         struct ip *ip;
  510         int optlen;
  511         u_char *q;
  512         int i;
  513         int hlen;
  514 
  515         if (!m)
  516                 panic("ah4_finaldst: m == NULL");
  517         ip = mtod(m, struct ip *);
  518         hlen = (ip->ip_hl << 2);
  519 
  520         if (m->m_len < hlen) {
  521                 ipseclog((LOG_DEBUG,
  522                     "ah4_finaldst: parameter mbuf wrong (not pulled up)\n"));
  523                 return NULL;
  524         }
  525 
  526         if (hlen == sizeof(struct ip))
  527                 return NULL;
  528 
  529         optlen = hlen - sizeof(struct ip);
  530         if (optlen < 0) {
  531                 ipseclog((LOG_DEBUG, "ah4_finaldst: wrong optlen %d\n",
  532                     optlen));
  533                 return NULL;
  534         }
  535 
  536         q = (u_char *)(ip + 1);
  537         i = 0;
  538         while (i < optlen) {
  539                 if (i + IPOPT_OPTVAL >= optlen)
  540                         return NULL;
  541                 if (q[i + IPOPT_OPTVAL] == IPOPT_EOL ||
  542                     q[i + IPOPT_OPTVAL] == IPOPT_NOP ||
  543                     i + IPOPT_OLEN < optlen)
  544                         ;
  545                 else
  546                         return NULL;
  547 
  548                 switch (q[i + IPOPT_OPTVAL]) {
  549                 case IPOPT_EOL:
  550                         i = optlen;     /* bye */
  551                         break;
  552                 case IPOPT_NOP:
  553                         i++;
  554                         break;
  555                 case IPOPT_LSRR:
  556                 case IPOPT_SSRR:
  557                         if (q[i + IPOPT_OLEN] < 2 + sizeof(struct in_addr) ||
  558                             optlen - i < q[i + IPOPT_OLEN]) {
  559                                 ipseclog((LOG_ERR,
  560                                     "ip_finaldst: invalid IP option "
  561                                     "(code=%02x len=%02x)\n",
  562                                     q[i + IPOPT_OPTVAL], q[i + IPOPT_OLEN]));
  563                                 return NULL;
  564                         }
  565                         i += q[i + IPOPT_OLEN] - sizeof(struct in_addr);
  566                         return (struct in_addr *)(q + i);
  567                 default:
  568                         if (q[i + IPOPT_OLEN] < 2 ||
  569                             optlen - i < q[i + IPOPT_OLEN]) {
  570                                 ipseclog((LOG_ERR,
  571                                     "ip_finaldst: invalid IP option "
  572                                     "(code=%02x len=%02x)\n",
  573                                     q[i + IPOPT_OPTVAL], q[i + IPOPT_OLEN]));
  574                                 return NULL;
  575                         }
  576                         i += q[i + IPOPT_OLEN];
  577                         break;
  578                 }
  579         }
  580         return NULL;
  581 }
  582 #endif

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