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/8.0/sys/netipsec/xform_ah.c 196019 2009-08-01 19:26:27Z rwatson $      */
    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) \
   89         ((sav->flags & SADB_X_EXT_OLD) ? 16 : AH_HMAC_HASHLEN)
   90 
   91 VNET_DEFINE(int, ah_enable) = 1;        /* control flow of packets with AH */
   92 VNET_DEFINE(int, ah_cleartos) = 1;      /* clear ip_tos when doing AH calc */
   93 VNET_DEFINE(struct ahstat, ahstat);
   94 
   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 
  103 static unsigned char ipseczeroes[256];  /* larger than an ip6 extension hdr */
  104 
  105 static int ah_input_cb(struct cryptop*);
  106 static int ah_output_cb(struct cryptop*);
  107 
  108 /*
  109  * NB: this is public for use by the PF_KEY support.
  110  */
  111 struct auth_hash *
  112 ah_algorithm_lookup(int alg)
  113 {
  114         if (alg > SADB_AALG_MAX)
  115                 return NULL;
  116         switch (alg) {
  117         case SADB_X_AALG_NULL:
  118                 return &auth_hash_null;
  119         case SADB_AALG_MD5HMAC:
  120                 return &auth_hash_hmac_md5;
  121         case SADB_AALG_SHA1HMAC:
  122                 return &auth_hash_hmac_sha1;
  123         case SADB_X_AALG_RIPEMD160HMAC:
  124                 return &auth_hash_hmac_ripemd_160;
  125         case SADB_X_AALG_MD5:
  126                 return &auth_hash_key_md5;
  127         case SADB_X_AALG_SHA:
  128                 return &auth_hash_key_sha1;
  129         case SADB_X_AALG_SHA2_256:
  130                 return &auth_hash_hmac_sha2_256;
  131         case SADB_X_AALG_SHA2_384:
  132                 return &auth_hash_hmac_sha2_384;
  133         case SADB_X_AALG_SHA2_512:
  134                 return &auth_hash_hmac_sha2_512;
  135         }
  136         return NULL;
  137 }
  138 
  139 size_t
  140 ah_hdrsiz(struct secasvar *sav)
  141 {
  142         size_t size;
  143 
  144         if (sav != NULL) {
  145                 int authsize;
  146                 IPSEC_ASSERT(sav->tdb_authalgxform != NULL, ("null xform"));
  147                 /*XXX not right for null algorithm--does it matter??*/
  148                 authsize = AUTHSIZE(sav);
  149                 size = roundup(authsize, sizeof (u_int32_t)) + HDRSIZE(sav);
  150         } else {
  151                 /* default guess */
  152                 size = sizeof (struct ah) + sizeof (u_int32_t) + 16;
  153         }
  154         return size;
  155 }
  156 
  157 /*
  158  * NB: public for use by esp_init.
  159  */
  160 int
  161 ah_init0(struct secasvar *sav, struct xformsw *xsp, struct cryptoini *cria)
  162 {
  163         struct auth_hash *thash;
  164         int keylen;
  165 
  166         thash = ah_algorithm_lookup(sav->alg_auth);
  167         if (thash == NULL) {
  168                 DPRINTF(("%s: unsupported authentication algorithm %u\n",
  169                         __func__, sav->alg_auth));
  170                 return EINVAL;
  171         }
  172         /*
  173          * Verify the replay state block allocation is consistent with
  174          * the protocol type.  We check here so we can make assumptions
  175          * later during protocol processing.
  176          */
  177         /* NB: replay state is setup elsewhere (sigh) */
  178         if (((sav->flags&SADB_X_EXT_OLD) == 0) ^ (sav->replay != NULL)) {
  179                 DPRINTF(("%s: replay state block inconsistency, "
  180                         "%s algorithm %s replay state\n", __func__,
  181                         (sav->flags & SADB_X_EXT_OLD) ? "old" : "new",
  182                         sav->replay == NULL ? "without" : "with"));
  183                 return EINVAL;
  184         }
  185         if (sav->key_auth == NULL) {
  186                 DPRINTF(("%s: no authentication key for %s algorithm\n",
  187                         __func__, thash->name));
  188                 return EINVAL;
  189         }
  190         keylen = _KEYLEN(sav->key_auth);
  191         if (keylen != thash->keysize && thash->keysize != 0) {
  192                 DPRINTF(("%s: invalid keylength %d, algorithm %s requires "
  193                         "keysize %d\n", __func__,
  194                          keylen, thash->name, thash->keysize));
  195                 return EINVAL;
  196         }
  197 
  198         sav->tdb_xform = xsp;
  199         sav->tdb_authalgxform = thash;
  200 
  201         /* Initialize crypto session. */
  202         bzero(cria, sizeof (*cria));
  203         cria->cri_alg = sav->tdb_authalgxform->type;
  204         cria->cri_klen = _KEYBITS(sav->key_auth);
  205         cria->cri_key = sav->key_auth->key_data;
  206         cria->cri_mlen = AUTHSIZE(sav);
  207 
  208         return 0;
  209 }
  210 
  211 /*
  212  * ah_init() is called when an SPI is being set up.
  213  */
  214 static int
  215 ah_init(struct secasvar *sav, struct xformsw *xsp)
  216 {
  217         struct cryptoini cria;
  218         int error;
  219 
  220         error = ah_init0(sav, xsp, &cria);
  221         return error ? error :
  222                  crypto_newsession(&sav->tdb_cryptoid, &cria, V_crypto_support);
  223 }
  224 
  225 /*
  226  * Paranoia.
  227  *
  228  * NB: public for use by esp_zeroize (XXX).
  229  */
  230 int
  231 ah_zeroize(struct secasvar *sav)
  232 {
  233         int err;
  234 
  235         if (sav->key_auth)
  236                 bzero(sav->key_auth->key_data, _KEYLEN(sav->key_auth));
  237 
  238         err = crypto_freesession(sav->tdb_cryptoid);
  239         sav->tdb_cryptoid = 0;
  240         sav->tdb_authalgxform = NULL;
  241         sav->tdb_xform = NULL;
  242         return err;
  243 }
  244 
  245 /*
  246  * Massage IPv4/IPv6 headers for AH processing.
  247  */
  248 static int
  249 ah_massage_headers(struct mbuf **m0, int proto, int skip, int alg, int out)
  250 {
  251         struct mbuf *m = *m0;
  252         unsigned char *ptr;
  253         int off, count;
  254 
  255 #ifdef INET
  256         struct ip *ip;
  257 #endif /* INET */
  258 
  259 #ifdef INET6
  260         struct ip6_ext *ip6e;
  261         struct ip6_hdr ip6;
  262         int alloc, len, ad;
  263 #endif /* INET6 */
  264 
  265         switch (proto) {
  266 #ifdef INET
  267         case AF_INET:
  268                 /*
  269                  * This is the least painful way of dealing with IPv4 header
  270                  * and option processing -- just make sure they're in
  271                  * contiguous memory.
  272                  */
  273                 *m0 = m = m_pullup(m, skip);
  274                 if (m == NULL) {
  275                         DPRINTF(("%s: m_pullup failed\n", __func__));
  276                         return ENOBUFS;
  277                 }
  278 
  279                 /* Fix the IP header */
  280                 ip = mtod(m, struct ip *);
  281                 if (V_ah_cleartos)
  282                         ip->ip_tos = 0;
  283                 ip->ip_ttl = 0;
  284                 ip->ip_sum = 0;
  285 
  286                 /*
  287                  * On input, fix ip_len which has been byte-swapped
  288                  * at ip_input().
  289                  */
  290                 if (!out) {
  291                         ip->ip_len = htons(ip->ip_len + skip);
  292 
  293                         if (alg == CRYPTO_MD5_KPDK || alg == CRYPTO_SHA1_KPDK)
  294                                 ip->ip_off = htons(ip->ip_off & IP_DF);
  295                         else
  296                                 ip->ip_off = 0;
  297                 } else {
  298                         if (alg == CRYPTO_MD5_KPDK || alg == CRYPTO_SHA1_KPDK)
  299                                 ip->ip_off = htons(ntohs(ip->ip_off) & IP_DF);
  300                         else
  301                                 ip->ip_off = 0;
  302                 }
  303 
  304                 ptr = mtod(m, unsigned char *) + sizeof(struct ip);
  305 
  306                 /* IPv4 option processing */
  307                 for (off = sizeof(struct ip); off < skip;) {
  308                         if (ptr[off] == IPOPT_EOL || ptr[off] == IPOPT_NOP ||
  309                             off + 1 < skip)
  310                                 ;
  311                         else {
  312                                 DPRINTF(("%s: illegal IPv4 option length for "
  313                                         "option %d\n", __func__, ptr[off]));
  314 
  315                                 m_freem(m);
  316                                 return EINVAL;
  317                         }
  318 
  319                         switch (ptr[off]) {
  320                         case IPOPT_EOL:
  321                                 off = skip;  /* End the loop. */
  322                                 break;
  323 
  324                         case IPOPT_NOP:
  325                                 off++;
  326                                 break;
  327 
  328                         case IPOPT_SECURITY:    /* 0x82 */
  329                         case 0x85:      /* Extended security. */
  330                         case 0x86:      /* Commercial security. */
  331                         case 0x94:      /* Router alert */
  332                         case 0x95:      /* RFC1770 */
  333                                 /* Sanity check for option length. */
  334                                 if (ptr[off + 1] < 2) {
  335                                         DPRINTF(("%s: illegal IPv4 option "
  336                                                 "length for option %d\n",
  337                                                 __func__, ptr[off]));
  338 
  339                                         m_freem(m);
  340                                         return EINVAL;
  341                                 }
  342 
  343                                 off += ptr[off + 1];
  344                                 break;
  345 
  346                         case IPOPT_LSRR:
  347                         case IPOPT_SSRR:
  348                                 /* Sanity check for option length. */
  349                                 if (ptr[off + 1] < 2) {
  350                                         DPRINTF(("%s: illegal IPv4 option "
  351                                                 "length for option %d\n",
  352                                                 __func__, ptr[off]));
  353 
  354                                         m_freem(m);
  355                                         return EINVAL;
  356                                 }
  357 
  358                                 /*
  359                                  * On output, if we have either of the
  360                                  * source routing options, we should
  361                                  * swap the destination address of the
  362                                  * IP header with the last address
  363                                  * specified in the option, as that is
  364                                  * what the destination's IP header
  365                                  * will look like.
  366                                  */
  367                                 if (out)
  368                                         bcopy(ptr + off + ptr[off + 1] -
  369                                             sizeof(struct in_addr),
  370                                             &(ip->ip_dst), sizeof(struct in_addr));
  371 
  372                                 /* Fall through */
  373                         default:
  374                                 /* Sanity check for option length. */
  375                                 if (ptr[off + 1] < 2) {
  376                                         DPRINTF(("%s: illegal IPv4 option "
  377                                                 "length for option %d\n",
  378                                                 __func__, ptr[off]));
  379                                         m_freem(m);
  380                                         return EINVAL;
  381                                 }
  382 
  383                                 /* Zeroize all other options. */
  384                                 count = ptr[off + 1];
  385                                 bcopy(ipseczeroes, ptr, count);
  386                                 off += count;
  387                                 break;
  388                         }
  389 
  390                         /* Sanity check. */
  391                         if (off > skip) {
  392                                 DPRINTF(("%s: malformed IPv4 options header\n",
  393                                         __func__));
  394 
  395                                 m_freem(m);
  396                                 return EINVAL;
  397                         }
  398                 }
  399 
  400                 break;
  401 #endif /* INET */
  402 
  403 #ifdef INET6
  404         case AF_INET6:  /* Ugly... */
  405                 /* Copy and "cook" the IPv6 header. */
  406                 m_copydata(m, 0, sizeof(ip6), (caddr_t) &ip6);
  407 
  408                 /* We don't do IPv6 Jumbograms. */
  409                 if (ip6.ip6_plen == 0) {
  410                         DPRINTF(("%s: unsupported IPv6 jumbogram\n", __func__));
  411                         m_freem(m);
  412                         return EMSGSIZE;
  413                 }
  414 
  415                 ip6.ip6_flow = 0;
  416                 ip6.ip6_hlim = 0;
  417                 ip6.ip6_vfc &= ~IPV6_VERSION_MASK;
  418                 ip6.ip6_vfc |= IPV6_VERSION;
  419 
  420                 /* Scoped address handling. */
  421                 if (IN6_IS_SCOPE_LINKLOCAL(&ip6.ip6_src))
  422                         ip6.ip6_src.s6_addr16[1] = 0;
  423                 if (IN6_IS_SCOPE_LINKLOCAL(&ip6.ip6_dst))
  424                         ip6.ip6_dst.s6_addr16[1] = 0;
  425 
  426                 /* Done with IPv6 header. */
  427                 m_copyback(m, 0, sizeof(struct ip6_hdr), (caddr_t) &ip6);
  428 
  429                 /* Let's deal with the remaining headers (if any). */
  430                 if (skip - sizeof(struct ip6_hdr) > 0) {
  431                         if (m->m_len <= skip) {
  432                                 ptr = (unsigned char *) malloc(
  433                                     skip - sizeof(struct ip6_hdr),
  434                                     M_XDATA, M_NOWAIT);
  435                                 if (ptr == NULL) {
  436                                         DPRINTF(("%s: failed to allocate memory"
  437                                                 "for IPv6 headers\n",__func__));
  438                                         m_freem(m);
  439                                         return ENOBUFS;
  440                                 }
  441 
  442                                 /*
  443                                  * Copy all the protocol headers after
  444                                  * the IPv6 header.
  445                                  */
  446                                 m_copydata(m, sizeof(struct ip6_hdr),
  447                                     skip - sizeof(struct ip6_hdr), ptr);
  448                                 alloc = 1;
  449                         } else {
  450                                 /* No need to allocate memory. */
  451                                 ptr = mtod(m, unsigned char *) +
  452                                     sizeof(struct ip6_hdr);
  453                                 alloc = 0;
  454                         }
  455                 } else
  456                         break;
  457 
  458                 off = ip6.ip6_nxt & 0xff; /* Next header type. */
  459 
  460                 for (len = 0; len < skip - sizeof(struct ip6_hdr);)
  461                         switch (off) {
  462                         case IPPROTO_HOPOPTS:
  463                         case IPPROTO_DSTOPTS:
  464                                 ip6e = (struct ip6_ext *) (ptr + len);
  465 
  466                                 /*
  467                                  * Process the mutable/immutable
  468                                  * options -- borrows heavily from the
  469                                  * KAME code.
  470                                  */
  471                                 for (count = len + sizeof(struct ip6_ext);
  472                                      count < len + ((ip6e->ip6e_len + 1) << 3);) {
  473                                         if (ptr[count] == IP6OPT_PAD1) {
  474                                                 count++;
  475                                                 continue; /* Skip padding. */
  476                                         }
  477 
  478                                         /* Sanity check. */
  479                                         if (count > len +
  480                                             ((ip6e->ip6e_len + 1) << 3)) {
  481                                                 m_freem(m);
  482 
  483                                                 /* Free, if we allocated. */
  484                                                 if (alloc)
  485                                                         free(ptr, M_XDATA);
  486                                                 return EINVAL;
  487                                         }
  488 
  489                                         ad = ptr[count + 1];
  490 
  491                                         /* If mutable option, zeroize. */
  492                                         if (ptr[count] & IP6OPT_MUTABLE)
  493                                                 bcopy(ipseczeroes, ptr + count,
  494                                                     ptr[count + 1]);
  495 
  496                                         count += ad;
  497 
  498                                         /* Sanity check. */
  499                                         if (count >
  500                                             skip - sizeof(struct ip6_hdr)) {
  501                                                 m_freem(m);
  502 
  503                                                 /* Free, if we allocated. */
  504                                                 if (alloc)
  505                                                         free(ptr, M_XDATA);
  506                                                 return EINVAL;
  507                                         }
  508                                 }
  509 
  510                                 /* Advance. */
  511                                 len += ((ip6e->ip6e_len + 1) << 3);
  512                                 off = ip6e->ip6e_nxt;
  513                                 break;
  514 
  515                         case IPPROTO_ROUTING:
  516                                 /*
  517                                  * Always include routing headers in
  518                                  * computation.
  519                                  */
  520                                 ip6e = (struct ip6_ext *) (ptr + len);
  521                                 len += ((ip6e->ip6e_len + 1) << 3);
  522                                 off = ip6e->ip6e_nxt;
  523                                 break;
  524 
  525                         default:
  526                                 DPRINTF(("%s: unexpected IPv6 header type %d",
  527                                         __func__, off));
  528                                 if (alloc)
  529                                         free(ptr, M_XDATA);
  530                                 m_freem(m);
  531                                 return EINVAL;
  532                         }
  533 
  534                 /* Copyback and free, if we allocated. */
  535                 if (alloc) {
  536                         m_copyback(m, sizeof(struct ip6_hdr),
  537                             skip - sizeof(struct ip6_hdr), ptr);
  538                         free(ptr, M_XDATA);
  539                 }
  540 
  541                 break;
  542 #endif /* INET6 */
  543         }
  544 
  545         return 0;
  546 }
  547 
  548 /*
  549  * ah_input() gets called to verify that an input packet
  550  * passes authentication.
  551  */
  552 static int
  553 ah_input(struct mbuf *m, struct secasvar *sav, int skip, int protoff)
  554 {
  555         struct auth_hash *ahx;
  556         struct tdb_ident *tdbi;
  557         struct tdb_crypto *tc;
  558         struct m_tag *mtag;
  559         struct newah *ah;
  560         int hl, rplen, authsize;
  561 
  562         struct cryptodesc *crda;
  563         struct cryptop *crp;
  564 
  565         IPSEC_ASSERT(sav != NULL, ("null SA"));
  566         IPSEC_ASSERT(sav->key_auth != NULL, ("null authentication key"));
  567         IPSEC_ASSERT(sav->tdb_authalgxform != NULL,
  568                 ("null authentication xform"));
  569 
  570         /* Figure out header size. */
  571         rplen = HDRSIZE(sav);
  572 
  573         /* XXX don't pullup, just copy header */
  574         IP6_EXTHDR_GET(ah, struct newah *, m, skip, rplen);
  575         if (ah == NULL) {
  576                 DPRINTF(("ah_input: cannot pullup header\n"));
  577                 V_ahstat.ahs_hdrops++;          /*XXX*/
  578                 m_freem(m);
  579                 return ENOBUFS;
  580         }
  581 
  582         /* Check replay window, if applicable. */
  583         if (sav->replay && !ipsec_chkreplay(ntohl(ah->ah_seq), sav)) {
  584                 V_ahstat.ahs_replay++;
  585                 DPRINTF(("%s: packet replay failure: %s\n", __func__,
  586                           ipsec_logsastr(sav)));
  587                 m_freem(m);
  588                 return ENOBUFS;
  589         }
  590 
  591         /* Verify AH header length. */
  592         hl = ah->ah_len * sizeof (u_int32_t);
  593         ahx = sav->tdb_authalgxform;
  594         authsize = AUTHSIZE(sav);
  595         if (hl != authsize + rplen - sizeof (struct ah)) {
  596                 DPRINTF(("%s: bad authenticator length %u (expecting %lu)"
  597                         " for packet in SA %s/%08lx\n", __func__,
  598                         hl, (u_long) (authsize + rplen - sizeof (struct ah)),
  599                         ipsec_address(&sav->sah->saidx.dst),
  600                         (u_long) ntohl(sav->spi)));
  601                 V_ahstat.ahs_badauthl++;
  602                 m_freem(m);
  603                 return EACCES;
  604         }
  605         V_ahstat.ahs_ibytes += m->m_pkthdr.len - skip - hl;
  606 
  607         /* Get crypto descriptors. */
  608         crp = crypto_getreq(1);
  609         if (crp == NULL) {
  610                 DPRINTF(("%s: failed to acquire crypto descriptor\n",__func__));
  611                 V_ahstat.ahs_crypto++;
  612                 m_freem(m);
  613                 return ENOBUFS;
  614         }
  615 
  616         crda = crp->crp_desc;
  617         IPSEC_ASSERT(crda != NULL, ("null crypto descriptor"));
  618 
  619         crda->crd_skip = 0;
  620         crda->crd_len = m->m_pkthdr.len;
  621         crda->crd_inject = skip + rplen;
  622 
  623         /* Authentication operation. */
  624         crda->crd_alg = ahx->type;
  625         crda->crd_klen = _KEYBITS(sav->key_auth);
  626         crda->crd_key = sav->key_auth->key_data;
  627 
  628         /* Find out if we've already done crypto. */
  629         for (mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_CRYPTO_DONE, NULL);
  630              mtag != NULL;
  631              mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_CRYPTO_DONE, mtag)) {
  632                 tdbi = (struct tdb_ident *) (mtag + 1);
  633                 if (tdbi->proto == sav->sah->saidx.proto &&
  634                     tdbi->spi == sav->spi &&
  635                     !bcmp(&tdbi->dst, &sav->sah->saidx.dst,
  636                           sizeof (union sockaddr_union)))
  637                         break;
  638         }
  639 
  640         /* Allocate IPsec-specific opaque crypto info. */
  641         if (mtag == NULL) {
  642                 tc = (struct tdb_crypto *) malloc(sizeof (struct tdb_crypto) +
  643                         skip + rplen + authsize, M_XDATA, M_NOWAIT|M_ZERO);
  644         } else {
  645                 /* Hash verification has already been done successfully. */
  646                 tc = (struct tdb_crypto *) malloc(sizeof (struct tdb_crypto),
  647                                                     M_XDATA, M_NOWAIT|M_ZERO);
  648         }
  649         if (tc == NULL) {
  650                 DPRINTF(("%s: failed to allocate tdb_crypto\n", __func__));
  651                 V_ahstat.ahs_crypto++;
  652                 crypto_freereq(crp);
  653                 m_freem(m);
  654                 return ENOBUFS;
  655         }
  656 
  657         /* Only save information if crypto processing is needed. */
  658         if (mtag == NULL) {
  659                 int error;
  660 
  661                 /*
  662                  * Save the authenticator, the skipped portion of the packet,
  663                  * and the AH header.
  664                  */
  665                 m_copydata(m, 0, skip + rplen + authsize, (caddr_t)(tc+1));
  666 
  667                 /* Zeroize the authenticator on the packet. */
  668                 m_copyback(m, skip + rplen, authsize, ipseczeroes);
  669 
  670                 /* "Massage" the packet headers for crypto processing. */
  671                 error = ah_massage_headers(&m, sav->sah->saidx.dst.sa.sa_family,
  672                     skip, ahx->type, 0);
  673                 if (error != 0) {
  674                         /* NB: mbuf is free'd by ah_massage_headers */
  675                         V_ahstat.ahs_hdrops++;
  676                         free(tc, M_XDATA);
  677                         crypto_freereq(crp);
  678                         return error;
  679                 }
  680         }
  681 
  682         /* Crypto operation descriptor. */
  683         crp->crp_ilen = m->m_pkthdr.len; /* Total input length. */
  684         crp->crp_flags = CRYPTO_F_IMBUF | CRYPTO_F_CBIFSYNC;
  685         crp->crp_buf = (caddr_t) m;
  686         crp->crp_callback = ah_input_cb;
  687         crp->crp_sid = sav->tdb_cryptoid;
  688         crp->crp_opaque = (caddr_t) tc;
  689 
  690         /* These are passed as-is to the callback. */
  691         tc->tc_spi = sav->spi;
  692         tc->tc_dst = sav->sah->saidx.dst;
  693         tc->tc_proto = sav->sah->saidx.proto;
  694         tc->tc_nxt = ah->ah_nxt;
  695         tc->tc_protoff = protoff;
  696         tc->tc_skip = skip;
  697         tc->tc_ptr = (caddr_t) mtag; /* Save the mtag we've identified. */
  698 
  699         if (mtag == NULL)
  700                 return crypto_dispatch(crp);
  701         else
  702                 return ah_input_cb(crp);
  703 }
  704 
  705 #ifdef INET6
  706 #define IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, mtag) do {              \
  707         if (saidx->dst.sa.sa_family == AF_INET6) {                           \
  708                 error = ipsec6_common_input_cb(m, sav, skip, protoff, mtag); \
  709         } else {                                                             \
  710                 error = ipsec4_common_input_cb(m, sav, skip, protoff, mtag); \
  711         }                                                                    \
  712 } while (0)
  713 #else
  714 #define IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, mtag)                   \
  715         (error = ipsec4_common_input_cb(m, sav, skip, protoff, mtag))
  716 #endif
  717 
  718 /*
  719  * AH input callback from the crypto driver.
  720  */
  721 static int
  722 ah_input_cb(struct cryptop *crp)
  723 {
  724         int rplen, error, skip, protoff;
  725         unsigned char calc[AH_ALEN_MAX];
  726         struct mbuf *m;
  727         struct cryptodesc *crd;
  728         struct auth_hash *ahx;
  729         struct tdb_crypto *tc;
  730         struct m_tag *mtag;
  731         struct secasvar *sav;
  732         struct secasindex *saidx;
  733         u_int8_t nxt;
  734         caddr_t ptr;
  735         int authsize;
  736 
  737         crd = crp->crp_desc;
  738 
  739         tc = (struct tdb_crypto *) crp->crp_opaque;
  740         IPSEC_ASSERT(tc != NULL, ("null opaque crypto data area!"));
  741         skip = tc->tc_skip;
  742         nxt = tc->tc_nxt;
  743         protoff = tc->tc_protoff;
  744         mtag = (struct m_tag *) tc->tc_ptr;
  745         m = (struct mbuf *) crp->crp_buf;
  746 
  747         sav = KEY_ALLOCSA(&tc->tc_dst, tc->tc_proto, tc->tc_spi);
  748         if (sav == NULL) {
  749                 V_ahstat.ahs_notdb++;
  750                 DPRINTF(("%s: SA expired while in crypto\n", __func__));
  751                 error = ENOBUFS;                /*XXX*/
  752                 goto bad;
  753         }
  754 
  755         saidx = &sav->sah->saidx;
  756         IPSEC_ASSERT(saidx->dst.sa.sa_family == AF_INET ||
  757                 saidx->dst.sa.sa_family == AF_INET6,
  758                 ("unexpected protocol family %u", saidx->dst.sa.sa_family));
  759 
  760         ahx = (struct auth_hash *) sav->tdb_authalgxform;
  761 
  762         /* Check for crypto errors. */
  763         if (crp->crp_etype) {
  764                 if (sav->tdb_cryptoid != 0)
  765                         sav->tdb_cryptoid = crp->crp_sid;
  766 
  767                 if (crp->crp_etype == EAGAIN) {
  768                         error = crypto_dispatch(crp);
  769                         return error;
  770                 }
  771 
  772                 V_ahstat.ahs_noxform++;
  773                 DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype));
  774                 error = crp->crp_etype;
  775                 goto bad;
  776         } else {
  777                 V_ahstat.ahs_hist[sav->alg_auth]++;
  778                 crypto_freereq(crp);            /* No longer needed. */
  779                 crp = NULL;
  780         }
  781 
  782         /* Shouldn't happen... */
  783         if (m == NULL) {
  784                 V_ahstat.ahs_crypto++;
  785                 DPRINTF(("%s: bogus returned buffer from crypto\n", __func__));
  786                 error = EINVAL;
  787                 goto bad;
  788         }
  789 
  790         /* Figure out header size. */
  791         rplen = HDRSIZE(sav);
  792         authsize = AUTHSIZE(sav);
  793 
  794         /* Copy authenticator off the packet. */
  795         m_copydata(m, skip + rplen, authsize, calc);
  796 
  797         /*
  798          * If we have an mtag, we don't need to verify the authenticator --
  799          * it has been verified by an IPsec-aware NIC.
  800          */
  801         if (mtag == NULL) {
  802                 ptr = (caddr_t) (tc + 1);
  803 
  804                 /* Verify authenticator. */
  805                 if (bcmp(ptr + skip + rplen, calc, authsize)) {
  806                         DPRINTF(("%s: authentication hash mismatch for packet "
  807                             "in SA %s/%08lx\n", __func__,
  808                             ipsec_address(&saidx->dst),
  809                             (u_long) ntohl(sav->spi)));
  810                         V_ahstat.ahs_badauth++;
  811                         error = EACCES;
  812                         goto bad;
  813                 }
  814 
  815                 /* Fix the Next Protocol field. */
  816                 ((u_int8_t *) ptr)[protoff] = nxt;
  817 
  818                 /* Copyback the saved (uncooked) network headers. */
  819                 m_copyback(m, 0, skip, ptr);
  820         } else {
  821                 /* Fix the Next Protocol field. */
  822                 m_copyback(m, protoff, sizeof(u_int8_t), &nxt);
  823         }
  824 
  825         free(tc, M_XDATA), tc = NULL;                   /* No longer needed */
  826 
  827         /*
  828          * Header is now authenticated.
  829          */
  830         m->m_flags |= M_AUTHIPHDR|M_AUTHIPDGM;
  831 
  832         /*
  833          * Update replay sequence number, if appropriate.
  834          */
  835         if (sav->replay) {
  836                 u_int32_t seq;
  837 
  838                 m_copydata(m, skip + offsetof(struct newah, ah_seq),
  839                            sizeof (seq), (caddr_t) &seq);
  840                 if (ipsec_updatereplay(ntohl(seq), sav)) {
  841                         V_ahstat.ahs_replay++;
  842                         error = ENOBUFS;                        /*XXX as above*/
  843                         goto bad;
  844                 }
  845         }
  846 
  847         /*
  848          * Remove the AH header and authenticator from the mbuf.
  849          */
  850         error = m_striphdr(m, skip, rplen + authsize);
  851         if (error) {
  852                 DPRINTF(("%s: mangled mbuf chain for SA %s/%08lx\n", __func__,
  853                     ipsec_address(&saidx->dst), (u_long) ntohl(sav->spi)));
  854 
  855                 V_ahstat.ahs_hdrops++;
  856                 goto bad;
  857         }
  858 
  859         IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, mtag);
  860 
  861         KEY_FREESAV(&sav);
  862         return error;
  863 bad:
  864         if (sav)
  865                 KEY_FREESAV(&sav);
  866         if (m != NULL)
  867                 m_freem(m);
  868         if (tc != NULL)
  869                 free(tc, M_XDATA);
  870         if (crp != NULL)
  871                 crypto_freereq(crp);
  872         return error;
  873 }
  874 
  875 /*
  876  * AH output routine, called by ipsec[46]_process_packet().
  877  */
  878 static int
  879 ah_output(
  880         struct mbuf *m,
  881         struct ipsecrequest *isr,
  882         struct mbuf **mp,
  883         int skip,
  884         int protoff)
  885 {
  886         struct secasvar *sav;
  887         struct auth_hash *ahx;
  888         struct cryptodesc *crda;
  889         struct tdb_crypto *tc;
  890         struct mbuf *mi;
  891         struct cryptop *crp;
  892         u_int16_t iplen;
  893         int error, rplen, authsize, maxpacketsize, roff;
  894         u_int8_t prot;
  895         struct newah *ah;
  896 
  897         sav = isr->sav;
  898         IPSEC_ASSERT(sav != NULL, ("null SA"));
  899         ahx = sav->tdb_authalgxform;
  900         IPSEC_ASSERT(ahx != NULL, ("null authentication xform"));
  901 
  902         V_ahstat.ahs_output++;
  903 
  904         /* Figure out header size. */
  905         rplen = HDRSIZE(sav);
  906 
  907         /* Check for maximum packet size violations. */
  908         switch (sav->sah->saidx.dst.sa.sa_family) {
  909 #ifdef INET
  910         case AF_INET:
  911                 maxpacketsize = IP_MAXPACKET;
  912                 break;
  913 #endif /* INET */
  914 #ifdef INET6
  915         case AF_INET6:
  916                 maxpacketsize = IPV6_MAXPACKET;
  917                 break;
  918 #endif /* INET6 */
  919         default:
  920                 DPRINTF(("%s: unknown/unsupported protocol family %u, "
  921                     "SA %s/%08lx\n", __func__,
  922                     sav->sah->saidx.dst.sa.sa_family,
  923                     ipsec_address(&sav->sah->saidx.dst),
  924                     (u_long) ntohl(sav->spi)));
  925                 V_ahstat.ahs_nopf++;
  926                 error = EPFNOSUPPORT;
  927                 goto bad;
  928         }
  929         authsize = AUTHSIZE(sav);
  930         if (rplen + authsize + m->m_pkthdr.len > maxpacketsize) {
  931                 DPRINTF(("%s: packet in SA %s/%08lx got too big "
  932                     "(len %u, max len %u)\n", __func__,
  933                     ipsec_address(&sav->sah->saidx.dst),
  934                     (u_long) ntohl(sav->spi),
  935                     rplen + authsize + m->m_pkthdr.len, maxpacketsize));
  936                 V_ahstat.ahs_toobig++;
  937                 error = EMSGSIZE;
  938                 goto bad;
  939         }
  940 
  941         /* Update the counters. */
  942         V_ahstat.ahs_obytes += m->m_pkthdr.len - skip;
  943 
  944         m = m_unshare(m, M_NOWAIT);
  945         if (m == NULL) {
  946                 DPRINTF(("%s: cannot clone mbuf chain, SA %s/%08lx\n", __func__,
  947                     ipsec_address(&sav->sah->saidx.dst),
  948                     (u_long) ntohl(sav->spi)));
  949                 V_ahstat.ahs_hdrops++;
  950                 error = ENOBUFS;
  951                 goto bad;
  952         }
  953 
  954         /* Inject AH header. */
  955         mi = m_makespace(m, skip, rplen + authsize, &roff);
  956         if (mi == NULL) {
  957                 DPRINTF(("%s: failed to inject %u byte AH header for SA "
  958                     "%s/%08lx\n", __func__,
  959                     rplen + authsize,
  960                     ipsec_address(&sav->sah->saidx.dst),
  961                     (u_long) ntohl(sav->spi)));
  962                 V_ahstat.ahs_hdrops++;          /*XXX differs from openbsd */
  963                 error = ENOBUFS;
  964                 goto bad;
  965         }
  966 
  967         /*
  968          * The AH header is guaranteed by m_makespace() to be in
  969          * contiguous memory, at roff bytes offset into the returned mbuf.
  970          */
  971         ah = (struct newah *)(mtod(mi, caddr_t) + roff);
  972 
  973         /* Initialize the AH header. */
  974         m_copydata(m, protoff, sizeof(u_int8_t), (caddr_t) &ah->ah_nxt);
  975         ah->ah_len = (rplen + authsize - sizeof(struct ah)) / sizeof(u_int32_t);
  976         ah->ah_reserve = 0;
  977         ah->ah_spi = sav->spi;
  978 
  979         /* Zeroize authenticator. */
  980         m_copyback(m, skip + rplen, authsize, ipseczeroes);
  981 
  982         /* Insert packet replay counter, as requested.  */
  983         if (sav->replay) {
  984                 if (sav->replay->count == ~0 &&
  985                     (sav->flags & SADB_X_EXT_CYCSEQ) == 0) {
  986                         DPRINTF(("%s: replay counter wrapped for SA %s/%08lx\n",
  987                                 __func__,
  988                                 ipsec_address(&sav->sah->saidx.dst),
  989                                 (u_long) ntohl(sav->spi)));
  990                         V_ahstat.ahs_wrap++;
  991                         error = EINVAL;
  992                         goto bad;
  993                 }
  994 #ifdef REGRESSION
  995                 /* Emulate replay attack when ipsec_replay is TRUE. */
  996                 if (!V_ipsec_replay)
  997 #endif
  998                         sav->replay->count++;
  999                 ah->ah_seq = htonl(sav->replay->count);
 1000         }
 1001 
 1002         /* Get crypto descriptors. */
 1003         crp = crypto_getreq(1);
 1004         if (crp == NULL) {
 1005                 DPRINTF(("%s: failed to acquire crypto descriptors\n",
 1006                         __func__));
 1007                 V_ahstat.ahs_crypto++;
 1008                 error = ENOBUFS;
 1009                 goto bad;
 1010         }
 1011 
 1012         crda = crp->crp_desc;
 1013 
 1014         crda->crd_skip = 0;
 1015         crda->crd_inject = skip + rplen;
 1016         crda->crd_len = m->m_pkthdr.len;
 1017 
 1018         /* Authentication operation. */
 1019         crda->crd_alg = ahx->type;
 1020         crda->crd_key = sav->key_auth->key_data;
 1021         crda->crd_klen = _KEYBITS(sav->key_auth);
 1022 
 1023         /* Allocate IPsec-specific opaque crypto info. */
 1024         tc = (struct tdb_crypto *) malloc(
 1025                 sizeof(struct tdb_crypto) + skip, M_XDATA, M_NOWAIT|M_ZERO);
 1026         if (tc == NULL) {
 1027                 crypto_freereq(crp);
 1028                 DPRINTF(("%s: failed to allocate tdb_crypto\n", __func__));
 1029                 V_ahstat.ahs_crypto++;
 1030                 error = ENOBUFS;
 1031                 goto bad;
 1032         }
 1033 
 1034         /* Save the skipped portion of the packet. */
 1035         m_copydata(m, 0, skip, (caddr_t) (tc + 1));
 1036 
 1037         /*
 1038          * Fix IP header length on the header used for
 1039          * authentication. We don't need to fix the original
 1040          * header length as it will be fixed by our caller.
 1041          */
 1042         switch (sav->sah->saidx.dst.sa.sa_family) {
 1043 #ifdef INET
 1044         case AF_INET:
 1045                 bcopy(((caddr_t)(tc + 1)) +
 1046                     offsetof(struct ip, ip_len),
 1047                     (caddr_t) &iplen, sizeof(u_int16_t));
 1048                 iplen = htons(ntohs(iplen) + rplen + authsize);
 1049                 m_copyback(m, offsetof(struct ip, ip_len),
 1050                     sizeof(u_int16_t), (caddr_t) &iplen);
 1051                 break;
 1052 #endif /* INET */
 1053 
 1054 #ifdef INET6
 1055         case AF_INET6:
 1056                 bcopy(((caddr_t)(tc + 1)) +
 1057                     offsetof(struct ip6_hdr, ip6_plen),
 1058                     (caddr_t) &iplen, sizeof(u_int16_t));
 1059                 iplen = htons(ntohs(iplen) + rplen + authsize);
 1060                 m_copyback(m, offsetof(struct ip6_hdr, ip6_plen),
 1061                     sizeof(u_int16_t), (caddr_t) &iplen);
 1062                 break;
 1063 #endif /* INET6 */
 1064         }
 1065 
 1066         /* Fix the Next Header field in saved header. */
 1067         ((u_int8_t *) (tc + 1))[protoff] = IPPROTO_AH;
 1068 
 1069         /* Update the Next Protocol field in the IP header. */
 1070         prot = IPPROTO_AH;
 1071         m_copyback(m, protoff, sizeof(u_int8_t), (caddr_t) &prot);
 1072 
 1073         /* "Massage" the packet headers for crypto processing. */
 1074         error = ah_massage_headers(&m, sav->sah->saidx.dst.sa.sa_family,
 1075                         skip, ahx->type, 1);
 1076         if (error != 0) {
 1077                 m = NULL;       /* mbuf was free'd by ah_massage_headers. */
 1078                 free(tc, M_XDATA);
 1079                 crypto_freereq(crp);
 1080                 goto bad;
 1081         }
 1082 
 1083         /* Crypto operation descriptor. */
 1084         crp->crp_ilen = m->m_pkthdr.len; /* Total input length. */
 1085         crp->crp_flags = CRYPTO_F_IMBUF | CRYPTO_F_CBIFSYNC;
 1086         crp->crp_buf = (caddr_t) m;
 1087         crp->crp_callback = ah_output_cb;
 1088         crp->crp_sid = sav->tdb_cryptoid;
 1089         crp->crp_opaque = (caddr_t) tc;
 1090 
 1091         /* These are passed as-is to the callback. */
 1092         tc->tc_isr = isr;
 1093         tc->tc_spi = sav->spi;
 1094         tc->tc_dst = sav->sah->saidx.dst;
 1095         tc->tc_proto = sav->sah->saidx.proto;
 1096         tc->tc_skip = skip;
 1097         tc->tc_protoff = protoff;
 1098 
 1099         return crypto_dispatch(crp);
 1100 bad:
 1101         if (m)
 1102                 m_freem(m);
 1103         return (error);
 1104 }
 1105 
 1106 /*
 1107  * AH output callback from the crypto driver.
 1108  */
 1109 static int
 1110 ah_output_cb(struct cryptop *crp)
 1111 {
 1112         int skip, protoff, error;
 1113         struct tdb_crypto *tc;
 1114         struct ipsecrequest *isr;
 1115         struct secasvar *sav;
 1116         struct mbuf *m;
 1117         caddr_t ptr;
 1118         int err;
 1119 
 1120         tc = (struct tdb_crypto *) crp->crp_opaque;
 1121         IPSEC_ASSERT(tc != NULL, ("null opaque data area!"));
 1122         skip = tc->tc_skip;
 1123         protoff = tc->tc_protoff;
 1124         ptr = (caddr_t) (tc + 1);
 1125         m = (struct mbuf *) crp->crp_buf;
 1126 
 1127         isr = tc->tc_isr;
 1128         IPSECREQUEST_LOCK(isr);
 1129         sav = KEY_ALLOCSA(&tc->tc_dst, tc->tc_proto, tc->tc_spi);
 1130         if (sav == NULL) {
 1131                 V_ahstat.ahs_notdb++;
 1132                 DPRINTF(("%s: SA expired while in crypto\n", __func__));
 1133                 error = ENOBUFS;                /*XXX*/
 1134                 goto bad;
 1135         }
 1136         IPSEC_ASSERT(isr->sav == sav, ("SA changed\n"));
 1137 
 1138         /* Check for crypto errors. */
 1139         if (crp->crp_etype) {
 1140                 if (sav->tdb_cryptoid != 0)
 1141                         sav->tdb_cryptoid = crp->crp_sid;
 1142 
 1143                 if (crp->crp_etype == EAGAIN) {
 1144                         KEY_FREESAV(&sav);
 1145                         IPSECREQUEST_UNLOCK(isr);
 1146                         error = crypto_dispatch(crp);
 1147                         return error;
 1148                 }
 1149 
 1150                 V_ahstat.ahs_noxform++;
 1151                 DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype));
 1152                 error = crp->crp_etype;
 1153                 goto bad;
 1154         }
 1155 
 1156         /* Shouldn't happen... */
 1157         if (m == NULL) {
 1158                 V_ahstat.ahs_crypto++;
 1159                 DPRINTF(("%s: bogus returned buffer from crypto\n", __func__));
 1160                 error = EINVAL;
 1161                 goto bad;
 1162         }
 1163         V_ahstat.ahs_hist[sav->alg_auth]++;
 1164 
 1165         /*
 1166          * Copy original headers (with the new protocol number) back
 1167          * in place.
 1168          */
 1169         m_copyback(m, 0, skip, ptr);
 1170 
 1171         /* No longer needed. */
 1172         free(tc, M_XDATA);
 1173         crypto_freereq(crp);
 1174 
 1175 #ifdef REGRESSION
 1176         /* Emulate man-in-the-middle attack when ipsec_integrity is TRUE. */
 1177         if (V_ipsec_integrity) {
 1178                 int alen;
 1179 
 1180                 /*
 1181                  * Corrupt HMAC if we want to test integrity verification of
 1182                  * the other side.
 1183                  */
 1184                 alen = AUTHSIZE(sav);
 1185                 m_copyback(m, m->m_pkthdr.len - alen, alen, ipseczeroes);
 1186         }
 1187 #endif
 1188 
 1189         /* NB: m is reclaimed by ipsec_process_done. */
 1190         err = ipsec_process_done(m, isr);
 1191         KEY_FREESAV(&sav);
 1192         IPSECREQUEST_UNLOCK(isr);
 1193         return err;
 1194 bad:
 1195         if (sav)
 1196                 KEY_FREESAV(&sav);
 1197         IPSECREQUEST_UNLOCK(isr);
 1198         if (m)
 1199                 m_freem(m);
 1200         free(tc, M_XDATA);
 1201         crypto_freereq(crp);
 1202         return error;
 1203 }
 1204 
 1205 static struct xformsw ah_xformsw = {
 1206         XF_AH,          XFT_AUTH,       "IPsec AH",
 1207         ah_init,        ah_zeroize,     ah_input,       ah_output,
 1208 };
 1209 
 1210 static void
 1211 ah_attach(void)
 1212 {
 1213 
 1214         xform_register(&ah_xformsw);
 1215 }
 1216 
 1217 SYSINIT(ah_xform_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, ah_attach, NULL);

Cache object: e6cf791d7af0afeab031d3e0bdf486e4


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