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

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    1 /*      $NetBSD: ah_output.c,v 1.28.2.1 2007/09/25 00:45:48 xtraeme 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 1.28.2.1 2007/09/25 00:45:48 xtraeme 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         dst.s_addr = 0;         /* XXX: GCC */
  160 
  161         /* sanity checks */
  162         if ((sav->flags & SADB_X_EXT_OLD) == 0 && !sav->replay) {
  163                 ip = mtod(m, struct ip *);
  164                 ipseclog((LOG_DEBUG, "ah4_output: internal error: "
  165                         "sav->replay is null: %x->%x, SPI=%u\n",
  166                         (u_int32_t)ntohl(ip->ip_src.s_addr),
  167                         (u_int32_t)ntohl(ip->ip_dst.s_addr),
  168                         (u_int32_t)ntohl(sav->spi)));
  169                 ipsecstat.out_inval++;
  170                 error = EINVAL;
  171                 goto fail;
  172         }
  173 
  174         algo = ah_algorithm_lookup(sav->alg_auth);
  175         if (!algo) {
  176                 ipseclog((LOG_ERR, "ah4_output: unsupported algorithm: "
  177                     "SPI=%u\n", (u_int32_t)ntohl(sav->spi)));
  178                 ipsecstat.out_inval++;
  179                 error = EINVAL;
  180                 goto fail;
  181         }
  182         spi = sav->spi;
  183 
  184         /*
  185          * determine the size to grow.
  186          */
  187         if (sav->flags & SADB_X_EXT_OLD) {
  188                 /* RFC 1826 */
  189                 plen = ((*algo->sumsiz)(sav) + 3) & ~(4 - 1); /* XXX pad to 8byte? */
  190                 ahlen = plen + sizeof(struct ah);
  191         } else {
  192                 /* RFC 2402 */
  193                 plen = ((*algo->sumsiz)(sav) + 3) & ~(4 - 1); /* XXX pad to 8byte? */
  194                 ahlen = plen + sizeof(struct newah);
  195         }
  196 
  197         /*
  198          * grow the mbuf to accommodate AH.
  199          */
  200         ip = mtod(m, struct ip *);
  201         hlen = ip->ip_hl << 2;
  202 
  203         if (m->m_len != hlen)
  204                 panic("ah4_output: assumption failed (first mbuf length)");
  205         if (M_LEADINGSPACE(m->m_next) < ahlen) {
  206                 struct mbuf *n;
  207                 MGET(n, M_DONTWAIT, MT_DATA);
  208                 if (!n) {
  209                         ipseclog((LOG_DEBUG, "ENOBUFS in ah4_output %d\n",
  210                             __LINE__));
  211                         error = ENOBUFS;
  212                         goto fail;
  213                 }
  214                 n->m_len = ahlen;
  215                 n->m_next = m->m_next;
  216                 m->m_next = n;
  217                 m->m_pkthdr.len += ahlen;
  218                 ahdrpos = mtod(n, u_char *);
  219         } else {
  220                 m->m_next->m_len += ahlen;
  221                 m->m_next->m_data -= ahlen;
  222                 m->m_pkthdr.len += ahlen;
  223                 ahdrpos = mtod(m->m_next, u_char *);
  224         }
  225 
  226         ip = mtod(m, struct ip *);      /* just to be sure */
  227 
  228         /*
  229          * initialize AH.
  230          */
  231         if (sav->flags & SADB_X_EXT_OLD) {
  232                 struct ah *ahdr;
  233 
  234                 ahdr = (struct ah *)ahdrpos;
  235                 ahsumpos = (u_char *)(ahdr + 1);
  236                 ahdr->ah_len = plen >> 2;
  237                 ahdr->ah_nxt = ip->ip_p;
  238                 ahdr->ah_reserve = htons(0);
  239                 ahdr->ah_spi = spi;
  240                 bzero(ahdr + 1, plen);
  241         } else {
  242                 struct newah *ahdr;
  243 
  244                 ahdr = (struct newah *)ahdrpos;
  245                 ahsumpos = (u_char *)(ahdr + 1);
  246                 ahdr->ah_len = (plen >> 2) + 1; /* plus one for seq# */
  247                 ahdr->ah_nxt = ip->ip_p;
  248                 ahdr->ah_reserve = htons(0);
  249                 ahdr->ah_spi = spi;
  250                 if (sav->replay->count == ~0) {
  251                         if ((sav->flags & SADB_X_EXT_CYCSEQ) == 0) {
  252                                 /* XXX Is it noisy ? */
  253                                 ipseclog((LOG_WARNING,
  254                                     "replay counter overflowed. %s\n",
  255                                     ipsec_logsastr(sav)));
  256                                 ipsecstat.out_inval++;
  257                                 error = EINVAL;
  258                                 goto fail;
  259                         }
  260                 }
  261                 sav->replay->count++;
  262                 /*
  263                  * XXX sequence number must not be cycled, if the SA is
  264                  * installed by IKE daemon.
  265                  */
  266                 ahdr->ah_seq = htonl(sav->replay->count & 0xffffffff);
  267                 bzero(ahdr + 1, plen);
  268         }
  269 
  270         /*
  271          * modify IPv4 header.
  272          */
  273         ip->ip_p = IPPROTO_AH;
  274         if (ahlen < (IP_MAXPACKET - ntohs(ip->ip_len)))
  275                 ip->ip_len = htons(ntohs(ip->ip_len) + ahlen);
  276         else {
  277                 ipseclog((LOG_ERR, "IPv4 AH output: size exceeds limit\n"));
  278                 ipsecstat.out_inval++;
  279                 error = EMSGSIZE;
  280                 goto fail;
  281         }
  282 
  283         /*
  284          * If there is source routing option, update destination field in
  285          * the IPv4 header to the final destination.
  286          * Note that we do not need to update source routing option itself
  287          * (as done in IPv4 AH processing -- see ip6_output()), since
  288          * source routing option is not part of the ICV computation.
  289          */
  290         finaldst = ah4_finaldst(m);
  291         if (finaldst) {
  292                 dst.s_addr = ip->ip_dst.s_addr;
  293                 ip->ip_dst.s_addr = finaldst->s_addr;
  294         }
  295 
  296         /*
  297          * calcurate the checksum, based on security association
  298          * and the algorithm specified.
  299          */
  300         error = ah4_calccksum(m, ahsumpos, plen, algo, sav);
  301         if (error) {
  302                 ipseclog((LOG_ERR,
  303                     "error after ah4_calccksum, called from ah4_output"));
  304                 ipsecstat.out_inval++;
  305                 goto fail;
  306         }
  307 
  308         if (finaldst) {
  309                 ip = mtod(m, struct ip *);      /* just to make sure */
  310                 ip->ip_dst.s_addr = dst.s_addr;
  311         }
  312         ipsecstat.out_success++;
  313         ipsecstat.out_ahhist[sav->alg_auth]++;
  314         key_sa_recordxfer(sav, m);
  315 
  316         return 0;
  317 
  318 fail:
  319         m_freem(m);
  320         return error;
  321 }
  322 #endif
  323 
  324 /* Calculate AH length */
  325 int
  326 ah_hdrlen(sav)
  327         struct secasvar *sav;
  328 {
  329         const struct ah_algorithm *algo;
  330         int plen, ahlen;
  331 
  332         algo = ah_algorithm_lookup(sav->alg_auth);
  333         if (!algo)
  334                 return 0;
  335         if (sav->flags & SADB_X_EXT_OLD) {
  336                 /* RFC 1826 */
  337                 plen = ((*algo->sumsiz)(sav) + 3) & ~(4 - 1);   /* XXX pad to 8byte? */
  338                 ahlen = plen + sizeof(struct ah);
  339         } else {
  340                 /* RFC 2402 */
  341                 plen = ((*algo->sumsiz)(sav) + 3) & ~(4 - 1);   /* XXX pad to 8byte? */
  342                 ahlen = plen + sizeof(struct newah);
  343         }
  344 
  345         return (ahlen);
  346 }
  347 
  348 #ifdef INET6
  349 /*
  350  * Fill in the Authentication Header and calculate checksum.
  351  */
  352 int
  353 ah6_output(m, nexthdrp, md, isr)
  354         struct mbuf *m;
  355         u_char *nexthdrp;
  356         struct mbuf *md;
  357         struct ipsecrequest *isr;
  358 {
  359         struct mbuf *mprev;
  360         struct mbuf *mah;
  361         struct secasvar *sav = isr->sav;
  362         const struct ah_algorithm *algo;
  363         u_int32_t spi;
  364         u_int8_t *ahsumpos = NULL;
  365         size_t plen;    /* AH payload size in bytes */
  366         int error = 0;
  367         int ahlen;
  368         struct ip6_hdr *ip6;
  369 
  370         if (m->m_len < sizeof(struct ip6_hdr)) {
  371                 ipseclog((LOG_DEBUG, "ah6_output: first mbuf too short\n"));
  372                 error = EINVAL;
  373                 goto fail;
  374         }
  375 
  376         ahlen = ah_hdrlen(sav);
  377         if (ahlen == 0)
  378                 return 0;
  379 
  380         for (mprev = m; mprev && mprev->m_next != md; mprev = mprev->m_next)
  381                 ;
  382         if (!mprev || mprev->m_next != md) {
  383                 ipseclog((LOG_DEBUG, "ah6_output: md is not in chain\n"));
  384                 error = EINVAL;
  385                 goto fail;
  386         }
  387 
  388         MGET(mah, M_DONTWAIT, MT_DATA);
  389         if (!mah) {
  390                 error = ENOBUFS;
  391                 goto fail;
  392         }
  393         if (ahlen > MLEN) {
  394                 MCLGET(mah, M_DONTWAIT);
  395                 if ((mah->m_flags & M_EXT) == 0) {
  396                         m_free(mah);
  397                         error = ENOBUFS;
  398                         goto fail;
  399                 }
  400         }
  401         mah->m_len = ahlen;
  402         mah->m_next = md;
  403         mprev->m_next = mah;
  404         m->m_pkthdr.len += ahlen;
  405 
  406         /* fix plen */
  407         if (m->m_pkthdr.len - sizeof(struct ip6_hdr) > IPV6_MAXPACKET) {
  408                 ipseclog((LOG_ERR,
  409                     "ah6_output: AH with IPv6 jumbogram is not supported\n"));
  410                 error = EINVAL;
  411                 goto fail;
  412         }
  413         ip6 = mtod(m, struct ip6_hdr *);
  414         ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr));
  415 
  416         if ((sav->flags & SADB_X_EXT_OLD) == 0 && !sav->replay) {
  417                 ipseclog((LOG_DEBUG, "ah6_output: internal error: "
  418                         "sav->replay is null: SPI=%u\n",
  419                         (u_int32_t)ntohl(sav->spi)));
  420                 ipsec6stat.out_inval++;
  421                 error = EINVAL;
  422                 goto fail;
  423         }
  424 
  425         algo = ah_algorithm_lookup(sav->alg_auth);
  426         if (!algo) {
  427                 ipseclog((LOG_ERR, "ah6_output: unsupported algorithm: "
  428                     "SPI=%u\n", (u_int32_t)ntohl(sav->spi)));
  429                 ipsec6stat.out_inval++;
  430                 error = EINVAL;
  431                 goto fail;
  432         }
  433         spi = sav->spi;
  434 
  435         /*
  436          * initialize AH.
  437          */
  438         if (sav->flags & SADB_X_EXT_OLD) {
  439                 struct ah *ahdr = mtod(mah, struct ah *);
  440 
  441                 plen = mah->m_len - sizeof(struct ah);
  442                 ahsumpos = (u_char *)(ahdr + 1);
  443                 ahdr->ah_nxt = *nexthdrp;
  444                 *nexthdrp = IPPROTO_AH;
  445                 ahdr->ah_len = plen >> 2;
  446                 ahdr->ah_reserve = htons(0);
  447                 ahdr->ah_spi = spi;
  448                 bzero(ahdr + 1, plen);
  449         } else {
  450                 struct newah *ahdr = mtod(mah, struct newah *);
  451 
  452                 plen = mah->m_len - sizeof(struct newah);
  453                 ahsumpos = (u_char *)(ahdr + 1);
  454                 ahdr->ah_nxt = *nexthdrp;
  455                 *nexthdrp = IPPROTO_AH;
  456                 ahdr->ah_len = (plen >> 2) + 1; /* plus one for seq# */
  457                 ahdr->ah_reserve = htons(0);
  458                 ahdr->ah_spi = spi;
  459                 if (sav->replay->count == ~0) {
  460                         if ((sav->flags & SADB_X_EXT_CYCSEQ) == 0) {
  461                                 /* XXX Is it noisy ? */
  462                                 ipseclog((LOG_WARNING,
  463                                     "replay counter overflowed. %s\n",
  464                                     ipsec_logsastr(sav)));
  465                                 ipsec6stat.out_inval++;
  466                                 error = EINVAL;
  467                                 goto fail;
  468                         }
  469                 }
  470                 sav->replay->count++;
  471                 /*
  472                  * XXX sequence number must not be cycled, if the SA is
  473                  * installed by IKE daemon.
  474                  */
  475                 ahdr->ah_seq = htonl(sav->replay->count);
  476                 bzero(ahdr + 1, plen);
  477         }
  478 
  479         /*
  480          * calcurate the checksum, based on security association
  481          * and the algorithm specified.
  482          */
  483         error = ah6_calccksum(m, ahsumpos, plen, algo, sav);
  484         if (error) {
  485                 ipsec6stat.out_inval++;
  486                 goto fail;
  487         } else {
  488                 ipsec6stat.out_success++;
  489                 key_sa_recordxfer(sav, m);
  490         }
  491         ipsec6stat.out_ahhist[sav->alg_auth]++;
  492 
  493         return 0;
  494 
  495 fail:
  496         m_freem(m);
  497         return error;
  498         
  499 }
  500 #endif
  501 
  502 #ifdef INET
  503 /*
  504  * Find the final destination if there is loose/strict source routing option.
  505  * Returns NULL if there's no source routing options.
  506  * Returns NULL on errors too.
  507  * Note that this function will return a pointer INTO the given parameter,
  508  * struct mbuf *m.
  509  * The mbuf must be pulled up toward, at least, ip option part.
  510  */
  511 static struct in_addr *
  512 ah4_finaldst(m)
  513         struct mbuf *m;
  514 {
  515         struct ip *ip;
  516         int optlen;
  517         u_char *q;
  518         int i;
  519         int hlen;
  520 
  521         if (!m)
  522                 panic("ah4_finaldst: m == NULL");
  523         ip = mtod(m, struct ip *);
  524         hlen = (ip->ip_hl << 2);
  525 
  526         if (m->m_len < hlen) {
  527                 ipseclog((LOG_DEBUG,
  528                     "ah4_finaldst: parameter mbuf wrong (not pulled up)\n"));
  529                 return NULL;
  530         }
  531 
  532         if (hlen == sizeof(struct ip))
  533                 return NULL;
  534 
  535         optlen = hlen - sizeof(struct ip);
  536         if (optlen < 0) {
  537                 ipseclog((LOG_DEBUG, "ah4_finaldst: wrong optlen %d\n",
  538                     optlen));
  539                 return NULL;
  540         }
  541 
  542         q = (u_char *)(ip + 1);
  543         i = 0;
  544         while (i < optlen) {
  545                 if (i + IPOPT_OPTVAL >= optlen)
  546                         return NULL;
  547                 if (q[i + IPOPT_OPTVAL] == IPOPT_EOL ||
  548                     q[i + IPOPT_OPTVAL] == IPOPT_NOP ||
  549                     i + IPOPT_OLEN < optlen)
  550                         ;
  551                 else
  552                         return NULL;
  553 
  554                 switch (q[i + IPOPT_OPTVAL]) {
  555                 case IPOPT_EOL:
  556                         i = optlen;     /* bye */
  557                         break;
  558                 case IPOPT_NOP:
  559                         i++;
  560                         break;
  561                 case IPOPT_LSRR:
  562                 case IPOPT_SSRR:
  563                         if (q[i + IPOPT_OLEN] < 2 + sizeof(struct in_addr) ||
  564                             optlen - i < q[i + IPOPT_OLEN]) {
  565                                 ipseclog((LOG_ERR,
  566                                     "ip_finaldst: invalid IP option "
  567                                     "(code=%02x len=%02x)\n",
  568                                     q[i + IPOPT_OPTVAL], q[i + IPOPT_OLEN]));
  569                                 return NULL;
  570                         }
  571                         i += q[i + IPOPT_OLEN] - sizeof(struct in_addr);
  572                         return (struct in_addr *)(q + i);
  573                 default:
  574                         if (q[i + IPOPT_OLEN] < 2 ||
  575                             optlen - i < q[i + IPOPT_OLEN]) {
  576                                 ipseclog((LOG_ERR,
  577                                     "ip_finaldst: invalid IP option "
  578                                     "(code=%02x len=%02x)\n",
  579                                     q[i + IPOPT_OPTVAL], q[i + IPOPT_OLEN]));
  580                                 return NULL;
  581                         }
  582                         i += q[i + IPOPT_OLEN];
  583                         break;
  584                 }
  585         }
  586         return NULL;
  587 }
  588 #endif

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