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

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    1 /*      $FreeBSD: releng/9.0/sys/netipsec/xform_ah.c 221129 2011-04-27 19:28:42Z bz $   */
    2 /*      $OpenBSD: ip_ah.c,v 1.63 2001/06/26 06:18:58 angelos Exp $ */
    3 /*-
    4  * The authors of this code are John Ioannidis (ji@tla.org),
    5  * Angelos D. Keromytis (kermit@csd.uch.gr) and
    6  * Niels Provos (provos@physnet.uni-hamburg.de).
    7  *
    8  * The original version of this code was written by John Ioannidis
    9  * for BSD/OS in Athens, Greece, in November 1995.
   10  *
   11  * Ported to OpenBSD and NetBSD, with additional transforms, in December 1996,
   12  * by Angelos D. Keromytis.
   13  *
   14  * Additional transforms and features in 1997 and 1998 by Angelos D. Keromytis
   15  * and Niels Provos.
   16  *
   17  * Additional features in 1999 by Angelos D. Keromytis and Niklas Hallqvist.
   18  *
   19  * Copyright (c) 1995, 1996, 1997, 1998, 1999 by John Ioannidis,
   20  * Angelos D. Keromytis and Niels Provos.
   21  * Copyright (c) 1999 Niklas Hallqvist.
   22  * Copyright (c) 2001 Angelos D. Keromytis.
   23  *
   24  * Permission to use, copy, and modify this software with or without fee
   25  * is hereby granted, provided that this entire notice is included in
   26  * all copies of any software which is or includes a copy or
   27  * modification of this software.
   28  * You may use this code under the GNU public license if you so wish. Please
   29  * contribute changes back to the authors under this freer than GPL license
   30  * so that we may further the use of strong encryption without limitations to
   31  * all.
   32  *
   33  * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR
   34  * IMPLIED WARRANTY. IN PARTICULAR, NONE OF THE AUTHORS MAKES ANY
   35  * REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE
   36  * MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR
   37  * PURPOSE.
   38  */
   39 #include "opt_inet.h"
   40 #include "opt_inet6.h"
   41 
   42 #include <sys/param.h>
   43 #include <sys/systm.h>
   44 #include <sys/mbuf.h>
   45 #include <sys/socket.h>
   46 #include <sys/syslog.h>
   47 #include <sys/kernel.h>
   48 #include <sys/sysctl.h>
   49 
   50 #include <net/if.h>
   51 #include <net/vnet.h>
   52 
   53 #include <netinet/in.h>
   54 #include <netinet/in_systm.h>
   55 #include <netinet/ip.h>
   56 #include <netinet/ip_ecn.h>
   57 #include <netinet/ip6.h>
   58 
   59 #include <net/route.h>
   60 #include <netipsec/ipsec.h>
   61 #include <netipsec/ah.h>
   62 #include <netipsec/ah_var.h>
   63 #include <netipsec/xform.h>
   64 
   65 #ifdef INET6
   66 #include <netinet6/ip6_var.h>
   67 #include <netipsec/ipsec6.h>
   68 #include <netinet6/ip6_ecn.h>
   69 #endif
   70 
   71 #include <netipsec/key.h>
   72 #include <netipsec/key_debug.h>
   73 
   74 #include <opencrypto/cryptodev.h>
   75 
   76 /*
   77  * Return header size in bytes.  The old protocol did not support
   78  * the replay counter; the new protocol always includes the counter.
   79  */
   80 #define HDRSIZE(sav) \
   81         (((sav)->flags & SADB_X_EXT_OLD) ? \
   82                 sizeof (struct ah) : sizeof (struct ah) + sizeof (u_int32_t))
   83 /* 
   84  * Return authenticator size in bytes.  The old protocol is known
   85  * to use a fixed 16-byte authenticator.  The new algorithm use 12-byte
   86  * authenticator.
   87  */
   88 #define AUTHSIZE(sav)   ah_authsize(sav)
   89 
   90 VNET_DEFINE(int, ah_enable) = 1;        /* control flow of packets with AH */
   91 VNET_DEFINE(int, ah_cleartos) = 1;      /* clear ip_tos when doing AH calc */
   92 VNET_DEFINE(struct ahstat, ahstat);
   93 
   94 #ifdef INET
   95 SYSCTL_DECL(_net_inet_ah);
   96 SYSCTL_VNET_INT(_net_inet_ah, OID_AUTO,
   97         ah_enable,      CTLFLAG_RW,     &VNET_NAME(ah_enable),  0, "");
   98 SYSCTL_VNET_INT(_net_inet_ah, OID_AUTO,
   99         ah_cleartos,    CTLFLAG_RW,     &VNET_NAME(ah_cleartos), 0, "");
  100 SYSCTL_VNET_STRUCT(_net_inet_ah, IPSECCTL_STATS,
  101         stats,          CTLFLAG_RD,     &VNET_NAME(ahstat), ahstat, "");
  102 #endif
  103 
  104 static unsigned char ipseczeroes[256];  /* larger than an ip6 extension hdr */
  105 
  106 static int ah_input_cb(struct cryptop*);
  107 static int ah_output_cb(struct cryptop*);
  108 
  109 static int
  110 ah_authsize(struct secasvar *sav)
  111 {
  112 
  113         IPSEC_ASSERT(sav != NULL, ("%s: sav == NULL", __func__));
  114 
  115         if (sav->flags & SADB_X_EXT_OLD)
  116                 return 16;
  117 
  118         switch (sav->alg_auth) {
  119         case SADB_X_AALG_SHA2_256:
  120                 return 16;
  121         case SADB_X_AALG_SHA2_384:
  122                 return 24;
  123         case SADB_X_AALG_SHA2_512:
  124                 return 32;
  125         default:
  126                 return AH_HMAC_HASHLEN;
  127         }
  128         /* NOTREACHED */
  129 }
  130 /*
  131  * NB: this is public for use by the PF_KEY support.
  132  */
  133 struct auth_hash *
  134 ah_algorithm_lookup(int alg)
  135 {
  136         if (alg > SADB_AALG_MAX)
  137                 return NULL;
  138         switch (alg) {
  139         case SADB_X_AALG_NULL:
  140                 return &auth_hash_null;
  141         case SADB_AALG_MD5HMAC:
  142                 return &auth_hash_hmac_md5;
  143         case SADB_AALG_SHA1HMAC:
  144                 return &auth_hash_hmac_sha1;
  145         case SADB_X_AALG_RIPEMD160HMAC:
  146                 return &auth_hash_hmac_ripemd_160;
  147         case SADB_X_AALG_MD5:
  148                 return &auth_hash_key_md5;
  149         case SADB_X_AALG_SHA:
  150                 return &auth_hash_key_sha1;
  151         case SADB_X_AALG_SHA2_256:
  152                 return &auth_hash_hmac_sha2_256;
  153         case SADB_X_AALG_SHA2_384:
  154                 return &auth_hash_hmac_sha2_384;
  155         case SADB_X_AALG_SHA2_512:
  156                 return &auth_hash_hmac_sha2_512;
  157         }
  158         return NULL;
  159 }
  160 
  161 size_t
  162 ah_hdrsiz(struct secasvar *sav)
  163 {
  164         size_t size;
  165 
  166         if (sav != NULL) {
  167                 int authsize;
  168                 IPSEC_ASSERT(sav->tdb_authalgxform != NULL, ("null xform"));
  169                 /*XXX not right for null algorithm--does it matter??*/
  170                 authsize = AUTHSIZE(sav);
  171                 size = roundup(authsize, sizeof (u_int32_t)) + HDRSIZE(sav);
  172         } else {
  173                 /* default guess */
  174                 size = sizeof (struct ah) + sizeof (u_int32_t) + 16;
  175         }
  176         return size;
  177 }
  178 
  179 /*
  180  * NB: public for use by esp_init.
  181  */
  182 int
  183 ah_init0(struct secasvar *sav, struct xformsw *xsp, struct cryptoini *cria)
  184 {
  185         struct auth_hash *thash;
  186         int keylen;
  187 
  188         thash = ah_algorithm_lookup(sav->alg_auth);
  189         if (thash == NULL) {
  190                 DPRINTF(("%s: unsupported authentication algorithm %u\n",
  191                         __func__, sav->alg_auth));
  192                 return EINVAL;
  193         }
  194         /*
  195          * Verify the replay state block allocation is consistent with
  196          * the protocol type.  We check here so we can make assumptions
  197          * later during protocol processing.
  198          */
  199         /* NB: replay state is setup elsewhere (sigh) */
  200         if (((sav->flags&SADB_X_EXT_OLD) == 0) ^ (sav->replay != NULL)) {
  201                 DPRINTF(("%s: replay state block inconsistency, "
  202                         "%s algorithm %s replay state\n", __func__,
  203                         (sav->flags & SADB_X_EXT_OLD) ? "old" : "new",
  204                         sav->replay == NULL ? "without" : "with"));
  205                 return EINVAL;
  206         }
  207         if (sav->key_auth == NULL) {
  208                 DPRINTF(("%s: no authentication key for %s algorithm\n",
  209                         __func__, thash->name));
  210                 return EINVAL;
  211         }
  212         keylen = _KEYLEN(sav->key_auth);
  213         if (keylen != thash->keysize && thash->keysize != 0) {
  214                 DPRINTF(("%s: invalid keylength %d, algorithm %s requires "
  215                         "keysize %d\n", __func__,
  216                          keylen, thash->name, thash->keysize));
  217                 return EINVAL;
  218         }
  219 
  220         sav->tdb_xform = xsp;
  221         sav->tdb_authalgxform = thash;
  222 
  223         /* Initialize crypto session. */
  224         bzero(cria, sizeof (*cria));
  225         cria->cri_alg = sav->tdb_authalgxform->type;
  226         cria->cri_klen = _KEYBITS(sav->key_auth);
  227         cria->cri_key = sav->key_auth->key_data;
  228         cria->cri_mlen = AUTHSIZE(sav);
  229 
  230         return 0;
  231 }
  232 
  233 /*
  234  * ah_init() is called when an SPI is being set up.
  235  */
  236 static int
  237 ah_init(struct secasvar *sav, struct xformsw *xsp)
  238 {
  239         struct cryptoini cria;
  240         int error;
  241 
  242         error = ah_init0(sav, xsp, &cria);
  243         return error ? error :
  244                  crypto_newsession(&sav->tdb_cryptoid, &cria, V_crypto_support);
  245 }
  246 
  247 /*
  248  * Paranoia.
  249  *
  250  * NB: public for use by esp_zeroize (XXX).
  251  */
  252 int
  253 ah_zeroize(struct secasvar *sav)
  254 {
  255         int err;
  256 
  257         if (sav->key_auth)
  258                 bzero(sav->key_auth->key_data, _KEYLEN(sav->key_auth));
  259 
  260         err = crypto_freesession(sav->tdb_cryptoid);
  261         sav->tdb_cryptoid = 0;
  262         sav->tdb_authalgxform = NULL;
  263         sav->tdb_xform = NULL;
  264         return err;
  265 }
  266 
  267 /*
  268  * Massage IPv4/IPv6 headers for AH processing.
  269  */
  270 static int
  271 ah_massage_headers(struct mbuf **m0, int proto, int skip, int alg, int out)
  272 {
  273         struct mbuf *m = *m0;
  274         unsigned char *ptr;
  275         int off, count;
  276 
  277 #ifdef INET
  278         struct ip *ip;
  279 #endif /* INET */
  280 
  281 #ifdef INET6
  282         struct ip6_ext *ip6e;
  283         struct ip6_hdr ip6;
  284         int alloc, len, ad;
  285 #endif /* INET6 */
  286 
  287         switch (proto) {
  288 #ifdef INET
  289         case AF_INET:
  290                 /*
  291                  * This is the least painful way of dealing with IPv4 header
  292                  * and option processing -- just make sure they're in
  293                  * contiguous memory.
  294                  */
  295                 *m0 = m = m_pullup(m, skip);
  296                 if (m == NULL) {
  297                         DPRINTF(("%s: m_pullup failed\n", __func__));
  298                         return ENOBUFS;
  299                 }
  300 
  301                 /* Fix the IP header */
  302                 ip = mtod(m, struct ip *);
  303                 if (V_ah_cleartos)
  304                         ip->ip_tos = 0;
  305                 ip->ip_ttl = 0;
  306                 ip->ip_sum = 0;
  307 
  308                 /*
  309                  * On input, fix ip_len which has been byte-swapped
  310                  * at ip_input().
  311                  */
  312                 if (!out) {
  313                         ip->ip_len = htons(ip->ip_len + skip);
  314 
  315                         if (alg == CRYPTO_MD5_KPDK || alg == CRYPTO_SHA1_KPDK)
  316                                 ip->ip_off = htons(ip->ip_off & IP_DF);
  317                         else
  318                                 ip->ip_off = 0;
  319                 } else {
  320                         if (alg == CRYPTO_MD5_KPDK || alg == CRYPTO_SHA1_KPDK)
  321                                 ip->ip_off = htons(ntohs(ip->ip_off) & IP_DF);
  322                         else
  323                                 ip->ip_off = 0;
  324                 }
  325 
  326                 ptr = mtod(m, unsigned char *) + sizeof(struct ip);
  327 
  328                 /* IPv4 option processing */
  329                 for (off = sizeof(struct ip); off < skip;) {
  330                         if (ptr[off] == IPOPT_EOL || ptr[off] == IPOPT_NOP ||
  331                             off + 1 < skip)
  332                                 ;
  333                         else {
  334                                 DPRINTF(("%s: illegal IPv4 option length for "
  335                                         "option %d\n", __func__, ptr[off]));
  336 
  337                                 m_freem(m);
  338                                 return EINVAL;
  339                         }
  340 
  341                         switch (ptr[off]) {
  342                         case IPOPT_EOL:
  343                                 off = skip;  /* End the loop. */
  344                                 break;
  345 
  346                         case IPOPT_NOP:
  347                                 off++;
  348                                 break;
  349 
  350                         case IPOPT_SECURITY:    /* 0x82 */
  351                         case 0x85:      /* Extended security. */
  352                         case 0x86:      /* Commercial security. */
  353                         case 0x94:      /* Router alert */
  354                         case 0x95:      /* RFC1770 */
  355                                 /* Sanity check for option length. */
  356                                 if (ptr[off + 1] < 2) {
  357                                         DPRINTF(("%s: illegal IPv4 option "
  358                                                 "length for option %d\n",
  359                                                 __func__, ptr[off]));
  360 
  361                                         m_freem(m);
  362                                         return EINVAL;
  363                                 }
  364 
  365                                 off += ptr[off + 1];
  366                                 break;
  367 
  368                         case IPOPT_LSRR:
  369                         case IPOPT_SSRR:
  370                                 /* Sanity check for option length. */
  371                                 if (ptr[off + 1] < 2) {
  372                                         DPRINTF(("%s: illegal IPv4 option "
  373                                                 "length for option %d\n",
  374                                                 __func__, ptr[off]));
  375 
  376                                         m_freem(m);
  377                                         return EINVAL;
  378                                 }
  379 
  380                                 /*
  381                                  * On output, if we have either of the
  382                                  * source routing options, we should
  383                                  * swap the destination address of the
  384                                  * IP header with the last address
  385                                  * specified in the option, as that is
  386                                  * what the destination's IP header
  387                                  * will look like.
  388                                  */
  389                                 if (out)
  390                                         bcopy(ptr + off + ptr[off + 1] -
  391                                             sizeof(struct in_addr),
  392                                             &(ip->ip_dst), sizeof(struct in_addr));
  393 
  394                                 /* Fall through */
  395                         default:
  396                                 /* Sanity check for option length. */
  397                                 if (ptr[off + 1] < 2) {
  398                                         DPRINTF(("%s: illegal IPv4 option "
  399                                                 "length for option %d\n",
  400                                                 __func__, ptr[off]));
  401                                         m_freem(m);
  402                                         return EINVAL;
  403                                 }
  404 
  405                                 /* Zeroize all other options. */
  406                                 count = ptr[off + 1];
  407                                 bcopy(ipseczeroes, ptr, count);
  408                                 off += count;
  409                                 break;
  410                         }
  411 
  412                         /* Sanity check. */
  413                         if (off > skip) {
  414                                 DPRINTF(("%s: malformed IPv4 options header\n",
  415                                         __func__));
  416 
  417                                 m_freem(m);
  418                                 return EINVAL;
  419                         }
  420                 }
  421 
  422                 break;
  423 #endif /* INET */
  424 
  425 #ifdef INET6
  426         case AF_INET6:  /* Ugly... */
  427                 /* Copy and "cook" the IPv6 header. */
  428                 m_copydata(m, 0, sizeof(ip6), (caddr_t) &ip6);
  429 
  430                 /* We don't do IPv6 Jumbograms. */
  431                 if (ip6.ip6_plen == 0) {
  432                         DPRINTF(("%s: unsupported IPv6 jumbogram\n", __func__));
  433                         m_freem(m);
  434                         return EMSGSIZE;
  435                 }
  436 
  437                 ip6.ip6_flow = 0;
  438                 ip6.ip6_hlim = 0;
  439                 ip6.ip6_vfc &= ~IPV6_VERSION_MASK;
  440                 ip6.ip6_vfc |= IPV6_VERSION;
  441 
  442                 /* Scoped address handling. */
  443                 if (IN6_IS_SCOPE_LINKLOCAL(&ip6.ip6_src))
  444                         ip6.ip6_src.s6_addr16[1] = 0;
  445                 if (IN6_IS_SCOPE_LINKLOCAL(&ip6.ip6_dst))
  446                         ip6.ip6_dst.s6_addr16[1] = 0;
  447 
  448                 /* Done with IPv6 header. */
  449                 m_copyback(m, 0, sizeof(struct ip6_hdr), (caddr_t) &ip6);
  450 
  451                 /* Let's deal with the remaining headers (if any). */
  452                 if (skip - sizeof(struct ip6_hdr) > 0) {
  453                         if (m->m_len <= skip) {
  454                                 ptr = (unsigned char *) malloc(
  455                                     skip - sizeof(struct ip6_hdr),
  456                                     M_XDATA, M_NOWAIT);
  457                                 if (ptr == NULL) {
  458                                         DPRINTF(("%s: failed to allocate memory"
  459                                                 "for IPv6 headers\n",__func__));
  460                                         m_freem(m);
  461                                         return ENOBUFS;
  462                                 }
  463 
  464                                 /*
  465                                  * Copy all the protocol headers after
  466                                  * the IPv6 header.
  467                                  */
  468                                 m_copydata(m, sizeof(struct ip6_hdr),
  469                                     skip - sizeof(struct ip6_hdr), ptr);
  470                                 alloc = 1;
  471                         } else {
  472                                 /* No need to allocate memory. */
  473                                 ptr = mtod(m, unsigned char *) +
  474                                     sizeof(struct ip6_hdr);
  475                                 alloc = 0;
  476                         }
  477                 } else
  478                         break;
  479 
  480                 off = ip6.ip6_nxt & 0xff; /* Next header type. */
  481 
  482                 for (len = 0; len < skip - sizeof(struct ip6_hdr);)
  483                         switch (off) {
  484                         case IPPROTO_HOPOPTS:
  485                         case IPPROTO_DSTOPTS:
  486                                 ip6e = (struct ip6_ext *) (ptr + len);
  487 
  488                                 /*
  489                                  * Process the mutable/immutable
  490                                  * options -- borrows heavily from the
  491                                  * KAME code.
  492                                  */
  493                                 for (count = len + sizeof(struct ip6_ext);
  494                                      count < len + ((ip6e->ip6e_len + 1) << 3);) {
  495                                         if (ptr[count] == IP6OPT_PAD1) {
  496                                                 count++;
  497                                                 continue; /* Skip padding. */
  498                                         }
  499 
  500                                         /* Sanity check. */
  501                                         if (count > len +
  502                                             ((ip6e->ip6e_len + 1) << 3)) {
  503                                                 m_freem(m);
  504 
  505                                                 /* Free, if we allocated. */
  506                                                 if (alloc)
  507                                                         free(ptr, M_XDATA);
  508                                                 return EINVAL;
  509                                         }
  510 
  511                                         ad = ptr[count + 1];
  512 
  513                                         /* If mutable option, zeroize. */
  514                                         if (ptr[count] & IP6OPT_MUTABLE)
  515                                                 bcopy(ipseczeroes, ptr + count,
  516                                                     ptr[count + 1]);
  517 
  518                                         count += ad;
  519 
  520                                         /* Sanity check. */
  521                                         if (count >
  522                                             skip - sizeof(struct ip6_hdr)) {
  523                                                 m_freem(m);
  524 
  525                                                 /* Free, if we allocated. */
  526                                                 if (alloc)
  527                                                         free(ptr, M_XDATA);
  528                                                 return EINVAL;
  529                                         }
  530                                 }
  531 
  532                                 /* Advance. */
  533                                 len += ((ip6e->ip6e_len + 1) << 3);
  534                                 off = ip6e->ip6e_nxt;
  535                                 break;
  536 
  537                         case IPPROTO_ROUTING:
  538                                 /*
  539                                  * Always include routing headers in
  540                                  * computation.
  541                                  */
  542                                 ip6e = (struct ip6_ext *) (ptr + len);
  543                                 len += ((ip6e->ip6e_len + 1) << 3);
  544                                 off = ip6e->ip6e_nxt;
  545                                 break;
  546 
  547                         default:
  548                                 DPRINTF(("%s: unexpected IPv6 header type %d",
  549                                         __func__, off));
  550                                 if (alloc)
  551                                         free(ptr, M_XDATA);
  552                                 m_freem(m);
  553                                 return EINVAL;
  554                         }
  555 
  556                 /* Copyback and free, if we allocated. */
  557                 if (alloc) {
  558                         m_copyback(m, sizeof(struct ip6_hdr),
  559                             skip - sizeof(struct ip6_hdr), ptr);
  560                         free(ptr, M_XDATA);
  561                 }
  562 
  563                 break;
  564 #endif /* INET6 */
  565         }
  566 
  567         return 0;
  568 }
  569 
  570 /*
  571  * ah_input() gets called to verify that an input packet
  572  * passes authentication.
  573  */
  574 static int
  575 ah_input(struct mbuf *m, struct secasvar *sav, int skip, int protoff)
  576 {
  577         struct auth_hash *ahx;
  578         struct tdb_ident *tdbi;
  579         struct tdb_crypto *tc;
  580         struct m_tag *mtag;
  581         struct newah *ah;
  582         int hl, rplen, authsize;
  583 
  584         struct cryptodesc *crda;
  585         struct cryptop *crp;
  586 
  587         IPSEC_ASSERT(sav != NULL, ("null SA"));
  588         IPSEC_ASSERT(sav->key_auth != NULL, ("null authentication key"));
  589         IPSEC_ASSERT(sav->tdb_authalgxform != NULL,
  590                 ("null authentication xform"));
  591 
  592         /* Figure out header size. */
  593         rplen = HDRSIZE(sav);
  594 
  595         /* XXX don't pullup, just copy header */
  596         IP6_EXTHDR_GET(ah, struct newah *, m, skip, rplen);
  597         if (ah == NULL) {
  598                 DPRINTF(("ah_input: cannot pullup header\n"));
  599                 V_ahstat.ahs_hdrops++;          /*XXX*/
  600                 m_freem(m);
  601                 return ENOBUFS;
  602         }
  603 
  604         /* Check replay window, if applicable. */
  605         if (sav->replay && !ipsec_chkreplay(ntohl(ah->ah_seq), sav)) {
  606                 V_ahstat.ahs_replay++;
  607                 DPRINTF(("%s: packet replay failure: %s\n", __func__,
  608                           ipsec_logsastr(sav)));
  609                 m_freem(m);
  610                 return ENOBUFS;
  611         }
  612 
  613         /* Verify AH header length. */
  614         hl = ah->ah_len * sizeof (u_int32_t);
  615         ahx = sav->tdb_authalgxform;
  616         authsize = AUTHSIZE(sav);
  617         if (hl != authsize + rplen - sizeof (struct ah)) {
  618                 DPRINTF(("%s: bad authenticator length %u (expecting %lu)"
  619                         " for packet in SA %s/%08lx\n", __func__,
  620                         hl, (u_long) (authsize + rplen - sizeof (struct ah)),
  621                         ipsec_address(&sav->sah->saidx.dst),
  622                         (u_long) ntohl(sav->spi)));
  623                 V_ahstat.ahs_badauthl++;
  624                 m_freem(m);
  625                 return EACCES;
  626         }
  627         V_ahstat.ahs_ibytes += m->m_pkthdr.len - skip - hl;
  628 
  629         /* Get crypto descriptors. */
  630         crp = crypto_getreq(1);
  631         if (crp == NULL) {
  632                 DPRINTF(("%s: failed to acquire crypto descriptor\n",__func__));
  633                 V_ahstat.ahs_crypto++;
  634                 m_freem(m);
  635                 return ENOBUFS;
  636         }
  637 
  638         crda = crp->crp_desc;
  639         IPSEC_ASSERT(crda != NULL, ("null crypto descriptor"));
  640 
  641         crda->crd_skip = 0;
  642         crda->crd_len = m->m_pkthdr.len;
  643         crda->crd_inject = skip + rplen;
  644 
  645         /* Authentication operation. */
  646         crda->crd_alg = ahx->type;
  647         crda->crd_klen = _KEYBITS(sav->key_auth);
  648         crda->crd_key = sav->key_auth->key_data;
  649 
  650         /* Find out if we've already done crypto. */
  651         for (mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_CRYPTO_DONE, NULL);
  652              mtag != NULL;
  653              mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_CRYPTO_DONE, mtag)) {
  654                 tdbi = (struct tdb_ident *) (mtag + 1);
  655                 if (tdbi->proto == sav->sah->saidx.proto &&
  656                     tdbi->spi == sav->spi &&
  657                     !bcmp(&tdbi->dst, &sav->sah->saidx.dst,
  658                           sizeof (union sockaddr_union)))
  659                         break;
  660         }
  661 
  662         /* Allocate IPsec-specific opaque crypto info. */
  663         if (mtag == NULL) {
  664                 tc = (struct tdb_crypto *) malloc(sizeof (struct tdb_crypto) +
  665                         skip + rplen + authsize, M_XDATA, M_NOWAIT|M_ZERO);
  666         } else {
  667                 /* Hash verification has already been done successfully. */
  668                 tc = (struct tdb_crypto *) malloc(sizeof (struct tdb_crypto),
  669                                                     M_XDATA, M_NOWAIT|M_ZERO);
  670         }
  671         if (tc == NULL) {
  672                 DPRINTF(("%s: failed to allocate tdb_crypto\n", __func__));
  673                 V_ahstat.ahs_crypto++;
  674                 crypto_freereq(crp);
  675                 m_freem(m);
  676                 return ENOBUFS;
  677         }
  678 
  679         /* Only save information if crypto processing is needed. */
  680         if (mtag == NULL) {
  681                 int error;
  682 
  683                 /*
  684                  * Save the authenticator, the skipped portion of the packet,
  685                  * and the AH header.
  686                  */
  687                 m_copydata(m, 0, skip + rplen + authsize, (caddr_t)(tc+1));
  688 
  689                 /* Zeroize the authenticator on the packet. */
  690                 m_copyback(m, skip + rplen, authsize, ipseczeroes);
  691 
  692                 /* "Massage" the packet headers for crypto processing. */
  693                 error = ah_massage_headers(&m, sav->sah->saidx.dst.sa.sa_family,
  694                     skip, ahx->type, 0);
  695                 if (error != 0) {
  696                         /* NB: mbuf is free'd by ah_massage_headers */
  697                         V_ahstat.ahs_hdrops++;
  698                         free(tc, M_XDATA);
  699                         crypto_freereq(crp);
  700                         return error;
  701                 }
  702         }
  703 
  704         /* Crypto operation descriptor. */
  705         crp->crp_ilen = m->m_pkthdr.len; /* Total input length. */
  706         crp->crp_flags = CRYPTO_F_IMBUF | CRYPTO_F_CBIFSYNC;
  707         crp->crp_buf = (caddr_t) m;
  708         crp->crp_callback = ah_input_cb;
  709         crp->crp_sid = sav->tdb_cryptoid;
  710         crp->crp_opaque = (caddr_t) tc;
  711 
  712         /* These are passed as-is to the callback. */
  713         tc->tc_spi = sav->spi;
  714         tc->tc_dst = sav->sah->saidx.dst;
  715         tc->tc_proto = sav->sah->saidx.proto;
  716         tc->tc_nxt = ah->ah_nxt;
  717         tc->tc_protoff = protoff;
  718         tc->tc_skip = skip;
  719         tc->tc_ptr = (caddr_t) mtag; /* Save the mtag we've identified. */
  720         KEY_ADDREFSA(sav);
  721         tc->tc_sav = sav;
  722 
  723         if (mtag == NULL)
  724                 return crypto_dispatch(crp);
  725         else
  726                 return ah_input_cb(crp);
  727 }
  728 
  729 /*
  730  * AH input callback from the crypto driver.
  731  */
  732 static int
  733 ah_input_cb(struct cryptop *crp)
  734 {
  735         int rplen, error, skip, protoff;
  736         unsigned char calc[AH_ALEN_MAX];
  737         struct mbuf *m;
  738         struct cryptodesc *crd;
  739         struct auth_hash *ahx;
  740         struct tdb_crypto *tc;
  741         struct m_tag *mtag;
  742         struct secasvar *sav;
  743         struct secasindex *saidx;
  744         u_int8_t nxt;
  745         caddr_t ptr;
  746         int authsize;
  747 
  748         crd = crp->crp_desc;
  749 
  750         tc = (struct tdb_crypto *) crp->crp_opaque;
  751         IPSEC_ASSERT(tc != NULL, ("null opaque crypto data area!"));
  752         skip = tc->tc_skip;
  753         nxt = tc->tc_nxt;
  754         protoff = tc->tc_protoff;
  755         mtag = (struct m_tag *) tc->tc_ptr;
  756         m = (struct mbuf *) crp->crp_buf;
  757 
  758         sav = tc->tc_sav;
  759         IPSEC_ASSERT(sav != NULL, ("null SA!"));
  760 
  761         saidx = &sav->sah->saidx;
  762         IPSEC_ASSERT(saidx->dst.sa.sa_family == AF_INET ||
  763                 saidx->dst.sa.sa_family == AF_INET6,
  764                 ("unexpected protocol family %u", saidx->dst.sa.sa_family));
  765 
  766         ahx = (struct auth_hash *) sav->tdb_authalgxform;
  767 
  768         /* Check for crypto errors. */
  769         if (crp->crp_etype) {
  770                 if (sav->tdb_cryptoid != 0)
  771                         sav->tdb_cryptoid = crp->crp_sid;
  772 
  773                 if (crp->crp_etype == EAGAIN) {
  774                         error = crypto_dispatch(crp);
  775                         return error;
  776                 }
  777 
  778                 V_ahstat.ahs_noxform++;
  779                 DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype));
  780                 error = crp->crp_etype;
  781                 goto bad;
  782         } else {
  783                 V_ahstat.ahs_hist[sav->alg_auth]++;
  784                 crypto_freereq(crp);            /* No longer needed. */
  785                 crp = NULL;
  786         }
  787 
  788         /* Shouldn't happen... */
  789         if (m == NULL) {
  790                 V_ahstat.ahs_crypto++;
  791                 DPRINTF(("%s: bogus returned buffer from crypto\n", __func__));
  792                 error = EINVAL;
  793                 goto bad;
  794         }
  795 
  796         /* Figure out header size. */
  797         rplen = HDRSIZE(sav);
  798         authsize = AUTHSIZE(sav);
  799 
  800         /* Copy authenticator off the packet. */
  801         m_copydata(m, skip + rplen, authsize, calc);
  802 
  803         /*
  804          * If we have an mtag, we don't need to verify the authenticator --
  805          * it has been verified by an IPsec-aware NIC.
  806          */
  807         if (mtag == NULL) {
  808                 ptr = (caddr_t) (tc + 1);
  809 
  810                 /* Verify authenticator. */
  811                 if (bcmp(ptr + skip + rplen, calc, authsize)) {
  812                         DPRINTF(("%s: authentication hash mismatch for packet "
  813                             "in SA %s/%08lx\n", __func__,
  814                             ipsec_address(&saidx->dst),
  815                             (u_long) ntohl(sav->spi)));
  816                         V_ahstat.ahs_badauth++;
  817                         error = EACCES;
  818                         goto bad;
  819                 }
  820 
  821                 /* Fix the Next Protocol field. */
  822                 ((u_int8_t *) ptr)[protoff] = nxt;
  823 
  824                 /* Copyback the saved (uncooked) network headers. */
  825                 m_copyback(m, 0, skip, ptr);
  826         } else {
  827                 /* Fix the Next Protocol field. */
  828                 m_copyback(m, protoff, sizeof(u_int8_t), &nxt);
  829         }
  830 
  831         free(tc, M_XDATA), tc = NULL;                   /* No longer needed */
  832 
  833         /*
  834          * Header is now authenticated.
  835          */
  836         m->m_flags |= M_AUTHIPHDR|M_AUTHIPDGM;
  837 
  838         /*
  839          * Update replay sequence number, if appropriate.
  840          */
  841         if (sav->replay) {
  842                 u_int32_t seq;
  843 
  844                 m_copydata(m, skip + offsetof(struct newah, ah_seq),
  845                            sizeof (seq), (caddr_t) &seq);
  846                 if (ipsec_updatereplay(ntohl(seq), sav)) {
  847                         V_ahstat.ahs_replay++;
  848                         error = ENOBUFS;                        /*XXX as above*/
  849                         goto bad;
  850                 }
  851         }
  852 
  853         /*
  854          * Remove the AH header and authenticator from the mbuf.
  855          */
  856         error = m_striphdr(m, skip, rplen + authsize);
  857         if (error) {
  858                 DPRINTF(("%s: mangled mbuf chain for SA %s/%08lx\n", __func__,
  859                     ipsec_address(&saidx->dst), (u_long) ntohl(sav->spi)));
  860 
  861                 V_ahstat.ahs_hdrops++;
  862                 goto bad;
  863         }
  864 
  865         switch (saidx->dst.sa.sa_family) {
  866 #ifdef INET6
  867         case AF_INET6:
  868                 error = ipsec6_common_input_cb(m, sav, skip, protoff, mtag);
  869                 break;
  870 #endif
  871 #ifdef INET
  872         case AF_INET:
  873                 error = ipsec4_common_input_cb(m, sav, skip, protoff, mtag);
  874                 break;
  875 #endif
  876         default:
  877                 panic("%s: Unexpected address family: %d saidx=%p", __func__,
  878                     saidx->dst.sa.sa_family, saidx);
  879         }
  880 
  881         KEY_FREESAV(&sav);
  882         return error;
  883 bad:
  884         if (sav)
  885                 KEY_FREESAV(&sav);
  886         if (m != NULL)
  887                 m_freem(m);
  888         if (tc != NULL)
  889                 free(tc, M_XDATA);
  890         if (crp != NULL)
  891                 crypto_freereq(crp);
  892         return error;
  893 }
  894 
  895 /*
  896  * AH output routine, called by ipsec[46]_process_packet().
  897  */
  898 static int
  899 ah_output(
  900         struct mbuf *m,
  901         struct ipsecrequest *isr,
  902         struct mbuf **mp,
  903         int skip,
  904         int protoff)
  905 {
  906         struct secasvar *sav;
  907         struct auth_hash *ahx;
  908         struct cryptodesc *crda;
  909         struct tdb_crypto *tc;
  910         struct mbuf *mi;
  911         struct cryptop *crp;
  912         u_int16_t iplen;
  913         int error, rplen, authsize, maxpacketsize, roff;
  914         u_int8_t prot;
  915         struct newah *ah;
  916 
  917         sav = isr->sav;
  918         IPSEC_ASSERT(sav != NULL, ("null SA"));
  919         ahx = sav->tdb_authalgxform;
  920         IPSEC_ASSERT(ahx != NULL, ("null authentication xform"));
  921 
  922         V_ahstat.ahs_output++;
  923 
  924         /* Figure out header size. */
  925         rplen = HDRSIZE(sav);
  926 
  927         /* Check for maximum packet size violations. */
  928         switch (sav->sah->saidx.dst.sa.sa_family) {
  929 #ifdef INET
  930         case AF_INET:
  931                 maxpacketsize = IP_MAXPACKET;
  932                 break;
  933 #endif /* INET */
  934 #ifdef INET6
  935         case AF_INET6:
  936                 maxpacketsize = IPV6_MAXPACKET;
  937                 break;
  938 #endif /* INET6 */
  939         default:
  940                 DPRINTF(("%s: unknown/unsupported protocol family %u, "
  941                     "SA %s/%08lx\n", __func__,
  942                     sav->sah->saidx.dst.sa.sa_family,
  943                     ipsec_address(&sav->sah->saidx.dst),
  944                     (u_long) ntohl(sav->spi)));
  945                 V_ahstat.ahs_nopf++;
  946                 error = EPFNOSUPPORT;
  947                 goto bad;
  948         }
  949         authsize = AUTHSIZE(sav);
  950         if (rplen + authsize + m->m_pkthdr.len > maxpacketsize) {
  951                 DPRINTF(("%s: packet in SA %s/%08lx got too big "
  952                     "(len %u, max len %u)\n", __func__,
  953                     ipsec_address(&sav->sah->saidx.dst),
  954                     (u_long) ntohl(sav->spi),
  955                     rplen + authsize + m->m_pkthdr.len, maxpacketsize));
  956                 V_ahstat.ahs_toobig++;
  957                 error = EMSGSIZE;
  958                 goto bad;
  959         }
  960 
  961         /* Update the counters. */
  962         V_ahstat.ahs_obytes += m->m_pkthdr.len - skip;
  963 
  964         m = m_unshare(m, M_NOWAIT);
  965         if (m == NULL) {
  966                 DPRINTF(("%s: cannot clone mbuf chain, SA %s/%08lx\n", __func__,
  967                     ipsec_address(&sav->sah->saidx.dst),
  968                     (u_long) ntohl(sav->spi)));
  969                 V_ahstat.ahs_hdrops++;
  970                 error = ENOBUFS;
  971                 goto bad;
  972         }
  973 
  974         /* Inject AH header. */
  975         mi = m_makespace(m, skip, rplen + authsize, &roff);
  976         if (mi == NULL) {
  977                 DPRINTF(("%s: failed to inject %u byte AH header for SA "
  978                     "%s/%08lx\n", __func__,
  979                     rplen + authsize,
  980                     ipsec_address(&sav->sah->saidx.dst),
  981                     (u_long) ntohl(sav->spi)));
  982                 V_ahstat.ahs_hdrops++;          /*XXX differs from openbsd */
  983                 error = ENOBUFS;
  984                 goto bad;
  985         }
  986 
  987         /*
  988          * The AH header is guaranteed by m_makespace() to be in
  989          * contiguous memory, at roff bytes offset into the returned mbuf.
  990          */
  991         ah = (struct newah *)(mtod(mi, caddr_t) + roff);
  992 
  993         /* Initialize the AH header. */
  994         m_copydata(m, protoff, sizeof(u_int8_t), (caddr_t) &ah->ah_nxt);
  995         ah->ah_len = (rplen + authsize - sizeof(struct ah)) / sizeof(u_int32_t);
  996         ah->ah_reserve = 0;
  997         ah->ah_spi = sav->spi;
  998 
  999         /* Zeroize authenticator. */
 1000         m_copyback(m, skip + rplen, authsize, ipseczeroes);
 1001 
 1002         /* Insert packet replay counter, as requested.  */
 1003         if (sav->replay) {
 1004                 if (sav->replay->count == ~0 &&
 1005                     (sav->flags & SADB_X_EXT_CYCSEQ) == 0) {
 1006                         DPRINTF(("%s: replay counter wrapped for SA %s/%08lx\n",
 1007                                 __func__,
 1008                                 ipsec_address(&sav->sah->saidx.dst),
 1009                                 (u_long) ntohl(sav->spi)));
 1010                         V_ahstat.ahs_wrap++;
 1011                         error = EINVAL;
 1012                         goto bad;
 1013                 }
 1014 #ifdef REGRESSION
 1015                 /* Emulate replay attack when ipsec_replay is TRUE. */
 1016                 if (!V_ipsec_replay)
 1017 #endif
 1018                         sav->replay->count++;
 1019                 ah->ah_seq = htonl(sav->replay->count);
 1020         }
 1021 
 1022         /* Get crypto descriptors. */
 1023         crp = crypto_getreq(1);
 1024         if (crp == NULL) {
 1025                 DPRINTF(("%s: failed to acquire crypto descriptors\n",
 1026                         __func__));
 1027                 V_ahstat.ahs_crypto++;
 1028                 error = ENOBUFS;
 1029                 goto bad;
 1030         }
 1031 
 1032         crda = crp->crp_desc;
 1033 
 1034         crda->crd_skip = 0;
 1035         crda->crd_inject = skip + rplen;
 1036         crda->crd_len = m->m_pkthdr.len;
 1037 
 1038         /* Authentication operation. */
 1039         crda->crd_alg = ahx->type;
 1040         crda->crd_key = sav->key_auth->key_data;
 1041         crda->crd_klen = _KEYBITS(sav->key_auth);
 1042 
 1043         /* Allocate IPsec-specific opaque crypto info. */
 1044         tc = (struct tdb_crypto *) malloc(
 1045                 sizeof(struct tdb_crypto) + skip, M_XDATA, M_NOWAIT|M_ZERO);
 1046         if (tc == NULL) {
 1047                 crypto_freereq(crp);
 1048                 DPRINTF(("%s: failed to allocate tdb_crypto\n", __func__));
 1049                 V_ahstat.ahs_crypto++;
 1050                 error = ENOBUFS;
 1051                 goto bad;
 1052         }
 1053 
 1054         /* Save the skipped portion of the packet. */
 1055         m_copydata(m, 0, skip, (caddr_t) (tc + 1));
 1056 
 1057         /*
 1058          * Fix IP header length on the header used for
 1059          * authentication. We don't need to fix the original
 1060          * header length as it will be fixed by our caller.
 1061          */
 1062         switch (sav->sah->saidx.dst.sa.sa_family) {
 1063 #ifdef INET
 1064         case AF_INET:
 1065                 bcopy(((caddr_t)(tc + 1)) +
 1066                     offsetof(struct ip, ip_len),
 1067                     (caddr_t) &iplen, sizeof(u_int16_t));
 1068                 iplen = htons(ntohs(iplen) + rplen + authsize);
 1069                 m_copyback(m, offsetof(struct ip, ip_len),
 1070                     sizeof(u_int16_t), (caddr_t) &iplen);
 1071                 break;
 1072 #endif /* INET */
 1073 
 1074 #ifdef INET6
 1075         case AF_INET6:
 1076                 bcopy(((caddr_t)(tc + 1)) +
 1077                     offsetof(struct ip6_hdr, ip6_plen),
 1078                     (caddr_t) &iplen, sizeof(u_int16_t));
 1079                 iplen = htons(ntohs(iplen) + rplen + authsize);
 1080                 m_copyback(m, offsetof(struct ip6_hdr, ip6_plen),
 1081                     sizeof(u_int16_t), (caddr_t) &iplen);
 1082                 break;
 1083 #endif /* INET6 */
 1084         }
 1085 
 1086         /* Fix the Next Header field in saved header. */
 1087         ((u_int8_t *) (tc + 1))[protoff] = IPPROTO_AH;
 1088 
 1089         /* Update the Next Protocol field in the IP header. */
 1090         prot = IPPROTO_AH;
 1091         m_copyback(m, protoff, sizeof(u_int8_t), (caddr_t) &prot);
 1092 
 1093         /* "Massage" the packet headers for crypto processing. */
 1094         error = ah_massage_headers(&m, sav->sah->saidx.dst.sa.sa_family,
 1095                         skip, ahx->type, 1);
 1096         if (error != 0) {
 1097                 m = NULL;       /* mbuf was free'd by ah_massage_headers. */
 1098                 free(tc, M_XDATA);
 1099                 crypto_freereq(crp);
 1100                 goto bad;
 1101         }
 1102 
 1103         /* Crypto operation descriptor. */
 1104         crp->crp_ilen = m->m_pkthdr.len; /* Total input length. */
 1105         crp->crp_flags = CRYPTO_F_IMBUF | CRYPTO_F_CBIFSYNC;
 1106         crp->crp_buf = (caddr_t) m;
 1107         crp->crp_callback = ah_output_cb;
 1108         crp->crp_sid = sav->tdb_cryptoid;
 1109         crp->crp_opaque = (caddr_t) tc;
 1110 
 1111         /* These are passed as-is to the callback. */
 1112         tc->tc_isr = isr;
 1113         KEY_ADDREFSA(sav);
 1114         tc->tc_sav = sav;
 1115         tc->tc_spi = sav->spi;
 1116         tc->tc_dst = sav->sah->saidx.dst;
 1117         tc->tc_proto = sav->sah->saidx.proto;
 1118         tc->tc_skip = skip;
 1119         tc->tc_protoff = protoff;
 1120 
 1121         return crypto_dispatch(crp);
 1122 bad:
 1123         if (m)
 1124                 m_freem(m);
 1125         return (error);
 1126 }
 1127 
 1128 /*
 1129  * AH output callback from the crypto driver.
 1130  */
 1131 static int
 1132 ah_output_cb(struct cryptop *crp)
 1133 {
 1134         int skip, protoff, error;
 1135         struct tdb_crypto *tc;
 1136         struct ipsecrequest *isr;
 1137         struct secasvar *sav;
 1138         struct mbuf *m;
 1139         caddr_t ptr;
 1140         int err;
 1141 
 1142         tc = (struct tdb_crypto *) crp->crp_opaque;
 1143         IPSEC_ASSERT(tc != NULL, ("null opaque data area!"));
 1144         skip = tc->tc_skip;
 1145         protoff = tc->tc_protoff;
 1146         ptr = (caddr_t) (tc + 1);
 1147         m = (struct mbuf *) crp->crp_buf;
 1148 
 1149         isr = tc->tc_isr;
 1150         IPSECREQUEST_LOCK(isr);
 1151         sav = tc->tc_sav;
 1152         /* With the isr lock released SA pointer can be updated. */
 1153         if (sav != isr->sav) {
 1154                 V_ahstat.ahs_notdb++;
 1155                 DPRINTF(("%s: SA expired while in crypto\n", __func__));
 1156                 error = ENOBUFS;                /*XXX*/
 1157                 goto bad;
 1158         }
 1159 
 1160         /* Check for crypto errors. */
 1161         if (crp->crp_etype) {
 1162                 if (sav->tdb_cryptoid != 0)
 1163                         sav->tdb_cryptoid = crp->crp_sid;
 1164 
 1165                 if (crp->crp_etype == EAGAIN) {
 1166                         IPSECREQUEST_UNLOCK(isr);
 1167                         error = crypto_dispatch(crp);
 1168                         return error;
 1169                 }
 1170 
 1171                 V_ahstat.ahs_noxform++;
 1172                 DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype));
 1173                 error = crp->crp_etype;
 1174                 goto bad;
 1175         }
 1176 
 1177         /* Shouldn't happen... */
 1178         if (m == NULL) {
 1179                 V_ahstat.ahs_crypto++;
 1180                 DPRINTF(("%s: bogus returned buffer from crypto\n", __func__));
 1181                 error = EINVAL;
 1182                 goto bad;
 1183         }
 1184         V_ahstat.ahs_hist[sav->alg_auth]++;
 1185 
 1186         /*
 1187          * Copy original headers (with the new protocol number) back
 1188          * in place.
 1189          */
 1190         m_copyback(m, 0, skip, ptr);
 1191 
 1192         /* No longer needed. */
 1193         free(tc, M_XDATA);
 1194         crypto_freereq(crp);
 1195 
 1196 #ifdef REGRESSION
 1197         /* Emulate man-in-the-middle attack when ipsec_integrity is TRUE. */
 1198         if (V_ipsec_integrity) {
 1199                 int alen;
 1200 
 1201                 /*
 1202                  * Corrupt HMAC if we want to test integrity verification of
 1203                  * the other side.
 1204                  */
 1205                 alen = AUTHSIZE(sav);
 1206                 m_copyback(m, m->m_pkthdr.len - alen, alen, ipseczeroes);
 1207         }
 1208 #endif
 1209 
 1210         /* NB: m is reclaimed by ipsec_process_done. */
 1211         err = ipsec_process_done(m, isr);
 1212         KEY_FREESAV(&sav);
 1213         IPSECREQUEST_UNLOCK(isr);
 1214         return err;
 1215 bad:
 1216         if (sav)
 1217                 KEY_FREESAV(&sav);
 1218         IPSECREQUEST_UNLOCK(isr);
 1219         if (m)
 1220                 m_freem(m);
 1221         free(tc, M_XDATA);
 1222         crypto_freereq(crp);
 1223         return error;
 1224 }
 1225 
 1226 static struct xformsw ah_xformsw = {
 1227         XF_AH,          XFT_AUTH,       "IPsec AH",
 1228         ah_init,        ah_zeroize,     ah_input,       ah_output,
 1229 };
 1230 
 1231 static void
 1232 ah_attach(void)
 1233 {
 1234 
 1235         xform_register(&ah_xformsw);
 1236 }
 1237 
 1238 SYSINIT(ah_xform_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, ah_attach, NULL);

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