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/10.3/sys/netipsec/xform_ah.c 331985 2018-04-04 05:37:52Z gordon $      */
    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 <netipsec/ipsec.h>
   60 #include <netipsec/ah.h>
   61 #include <netipsec/ah_var.h>
   62 #include <netipsec/xform.h>
   63 
   64 #ifdef INET6
   65 #include <netinet6/ip6_var.h>
   66 #include <netipsec/ipsec6.h>
   67 #include <netinet6/ip6_ecn.h>
   68 #endif
   69 
   70 #include <netipsec/key.h>
   71 #include <netipsec/key_debug.h>
   72 
   73 #include <opencrypto/cryptodev.h>
   74 
   75 /*
   76  * Return header size in bytes.  The old protocol did not support
   77  * the replay counter; the new protocol always includes the counter.
   78  */
   79 #define HDRSIZE(sav) \
   80         (((sav)->flags & SADB_X_EXT_OLD) ? \
   81                 sizeof (struct ah) : sizeof (struct ah) + sizeof (u_int32_t))
   82 /* 
   83  * Return authenticator size in bytes.  The old protocol is known
   84  * to use a fixed 16-byte authenticator.  The new algorithm use 12-byte
   85  * authenticator.
   86  */
   87 #define AUTHSIZE(sav)   ah_authsize(sav)
   88 
   89 VNET_DEFINE(int, ah_enable) = 1;        /* control flow of packets with AH */
   90 VNET_DEFINE(int, ah_cleartos) = 1;      /* clear ip_tos when doing AH calc */
   91 VNET_PCPUSTAT_DEFINE(struct ahstat, ahstat);
   92 VNET_PCPUSTAT_SYSINIT(ahstat);
   93 
   94 #ifdef VIMAGE
   95 VNET_PCPUSTAT_SYSUNINIT(ahstat);
   96 #endif /* VIMAGE */
   97 
   98 #ifdef INET
   99 SYSCTL_DECL(_net_inet_ah);
  100 SYSCTL_VNET_INT(_net_inet_ah, OID_AUTO,
  101         ah_enable,      CTLFLAG_RW,     &VNET_NAME(ah_enable),  0, "");
  102 SYSCTL_VNET_INT(_net_inet_ah, OID_AUTO,
  103         ah_cleartos,    CTLFLAG_RW,     &VNET_NAME(ah_cleartos), 0, "");
  104 SYSCTL_VNET_PCPUSTAT(_net_inet_ah, IPSECCTL_STATS, stats, struct ahstat,
  105     ahstat, "AH statistics (struct ahstat, netipsec/ah_var.h)");
  106 #endif
  107 
  108 static unsigned char ipseczeroes[256];  /* larger than an ip6 extension hdr */
  109 
  110 static int ah_input_cb(struct cryptop*);
  111 static int ah_output_cb(struct cryptop*);
  112 
  113 static int
  114 ah_authsize(struct secasvar *sav)
  115 {
  116 
  117         IPSEC_ASSERT(sav != NULL, ("%s: sav == NULL", __func__));
  118 
  119         if (sav->flags & SADB_X_EXT_OLD)
  120                 return 16;
  121 
  122         switch (sav->alg_auth) {
  123         case SADB_X_AALG_SHA2_256:
  124                 return 16;
  125         case SADB_X_AALG_SHA2_384:
  126                 return 24;
  127         case SADB_X_AALG_SHA2_512:
  128                 return 32;
  129         default:
  130                 return AH_HMAC_HASHLEN;
  131         }
  132         /* NOTREACHED */
  133 }
  134 /*
  135  * NB: this is public for use by the PF_KEY support.
  136  */
  137 struct auth_hash *
  138 ah_algorithm_lookup(int alg)
  139 {
  140         if (alg > SADB_AALG_MAX)
  141                 return NULL;
  142         switch (alg) {
  143         case SADB_X_AALG_NULL:
  144                 return &auth_hash_null;
  145         case SADB_AALG_MD5HMAC:
  146                 return &auth_hash_hmac_md5;
  147         case SADB_AALG_SHA1HMAC:
  148                 return &auth_hash_hmac_sha1;
  149         case SADB_X_AALG_RIPEMD160HMAC:
  150                 return &auth_hash_hmac_ripemd_160;
  151         case SADB_X_AALG_MD5:
  152                 return &auth_hash_key_md5;
  153         case SADB_X_AALG_SHA:
  154                 return &auth_hash_key_sha1;
  155         case SADB_X_AALG_SHA2_256:
  156                 return &auth_hash_hmac_sha2_256;
  157         case SADB_X_AALG_SHA2_384:
  158                 return &auth_hash_hmac_sha2_384;
  159         case SADB_X_AALG_SHA2_512:
  160                 return &auth_hash_hmac_sha2_512;
  161         }
  162         return NULL;
  163 }
  164 
  165 size_t
  166 ah_hdrsiz(struct secasvar *sav)
  167 {
  168         size_t size;
  169 
  170         if (sav != NULL) {
  171                 int authsize;
  172                 IPSEC_ASSERT(sav->tdb_authalgxform != NULL, ("null xform"));
  173                 /*XXX not right for null algorithm--does it matter??*/
  174                 authsize = AUTHSIZE(sav);
  175                 size = roundup(authsize, sizeof (u_int32_t)) + HDRSIZE(sav);
  176         } else {
  177                 /* default guess */
  178                 size = sizeof (struct ah) + sizeof (u_int32_t) + 16;
  179         }
  180         return size;
  181 }
  182 
  183 /*
  184  * NB: public for use by esp_init.
  185  */
  186 int
  187 ah_init0(struct secasvar *sav, struct xformsw *xsp, struct cryptoini *cria)
  188 {
  189         struct auth_hash *thash;
  190         int keylen;
  191 
  192         thash = ah_algorithm_lookup(sav->alg_auth);
  193         if (thash == NULL) {
  194                 DPRINTF(("%s: unsupported authentication algorithm %u\n",
  195                         __func__, sav->alg_auth));
  196                 return EINVAL;
  197         }
  198         /*
  199          * Verify the replay state block allocation is consistent with
  200          * the protocol type.  We check here so we can make assumptions
  201          * later during protocol processing.
  202          */
  203         /* NB: replay state is setup elsewhere (sigh) */
  204         if (((sav->flags&SADB_X_EXT_OLD) == 0) ^ (sav->replay != NULL)) {
  205                 DPRINTF(("%s: replay state block inconsistency, "
  206                         "%s algorithm %s replay state\n", __func__,
  207                         (sav->flags & SADB_X_EXT_OLD) ? "old" : "new",
  208                         sav->replay == NULL ? "without" : "with"));
  209                 return EINVAL;
  210         }
  211         if (sav->key_auth == NULL) {
  212                 DPRINTF(("%s: no authentication key for %s algorithm\n",
  213                         __func__, thash->name));
  214                 return EINVAL;
  215         }
  216         keylen = _KEYLEN(sav->key_auth);
  217         if (keylen != thash->keysize && thash->keysize != 0) {
  218                 DPRINTF(("%s: invalid keylength %d, algorithm %s requires "
  219                         "keysize %d\n", __func__,
  220                          keylen, thash->name, thash->keysize));
  221                 return EINVAL;
  222         }
  223 
  224         sav->tdb_xform = xsp;
  225         sav->tdb_authalgxform = thash;
  226 
  227         /* Initialize crypto session. */
  228         bzero(cria, sizeof (*cria));
  229         cria->cri_alg = sav->tdb_authalgxform->type;
  230         cria->cri_klen = _KEYBITS(sav->key_auth);
  231         cria->cri_key = sav->key_auth->key_data;
  232         cria->cri_mlen = AUTHSIZE(sav);
  233 
  234         return 0;
  235 }
  236 
  237 /*
  238  * ah_init() is called when an SPI is being set up.
  239  */
  240 static int
  241 ah_init(struct secasvar *sav, struct xformsw *xsp)
  242 {
  243         struct cryptoini cria;
  244         int error;
  245 
  246         error = ah_init0(sav, xsp, &cria);
  247         return error ? error :
  248                  crypto_newsession(&sav->tdb_cryptoid, &cria, V_crypto_support);
  249 }
  250 
  251 /*
  252  * Paranoia.
  253  *
  254  * NB: public for use by esp_zeroize (XXX).
  255  */
  256 int
  257 ah_zeroize(struct secasvar *sav)
  258 {
  259         int err;
  260 
  261         if (sav->key_auth)
  262                 bzero(sav->key_auth->key_data, _KEYLEN(sav->key_auth));
  263 
  264         err = crypto_freesession(sav->tdb_cryptoid);
  265         sav->tdb_cryptoid = 0;
  266         sav->tdb_authalgxform = NULL;
  267         sav->tdb_xform = NULL;
  268         return err;
  269 }
  270 
  271 /*
  272  * Massage IPv4/IPv6 headers for AH processing.
  273  */
  274 static int
  275 ah_massage_headers(struct mbuf **m0, int proto, int skip, int alg, int out)
  276 {
  277         struct mbuf *m = *m0;
  278         unsigned char *ptr;
  279         int off, count;
  280 
  281 #ifdef INET
  282         struct ip *ip;
  283 #endif /* INET */
  284 
  285 #ifdef INET6
  286         struct ip6_ext *ip6e;
  287         struct ip6_hdr ip6;
  288         int ad, alloc, nxt, noff;
  289 #endif /* INET6 */
  290 
  291         switch (proto) {
  292 #ifdef INET
  293         case AF_INET:
  294                 /*
  295                  * This is the least painful way of dealing with IPv4 header
  296                  * and option processing -- just make sure they're in
  297                  * contiguous memory.
  298                  */
  299                 *m0 = m = m_pullup(m, skip);
  300                 if (m == NULL) {
  301                         DPRINTF(("%s: m_pullup failed\n", __func__));
  302                         return ENOBUFS;
  303                 }
  304 
  305                 /* Fix the IP header */
  306                 ip = mtod(m, struct ip *);
  307                 if (V_ah_cleartos)
  308                         ip->ip_tos = 0;
  309                 ip->ip_ttl = 0;
  310                 ip->ip_sum = 0;
  311 
  312                 if (alg == CRYPTO_MD5_KPDK || alg == CRYPTO_SHA1_KPDK)
  313                         ip->ip_off &= htons(IP_DF);
  314                 else
  315                         ip->ip_off = htons(0);
  316 
  317                 ptr = mtod(m, unsigned char *);
  318 
  319                 /* IPv4 option processing */
  320                 for (off = sizeof(struct ip); off < skip;) {
  321                         if (ptr[off] == IPOPT_EOL || ptr[off] == IPOPT_NOP ||
  322                             off + 1 < skip)
  323                                 ;
  324                         else {
  325                                 DPRINTF(("%s: illegal IPv4 option length for "
  326                                         "option %d\n", __func__, ptr[off]));
  327 
  328                                 m_freem(m);
  329                                 return EINVAL;
  330                         }
  331 
  332                         switch (ptr[off]) {
  333                         case IPOPT_EOL:
  334                                 off = skip;  /* End the loop. */
  335                                 break;
  336 
  337                         case IPOPT_NOP:
  338                                 off++;
  339                                 break;
  340 
  341                         case IPOPT_SECURITY:    /* 0x82 */
  342                         case 0x85:      /* Extended security. */
  343                         case 0x86:      /* Commercial security. */
  344                         case 0x94:      /* Router alert */
  345                         case 0x95:      /* RFC1770 */
  346                                 /* Sanity check for option length. */
  347                                 if (ptr[off + 1] < 2) {
  348                                         DPRINTF(("%s: illegal IPv4 option "
  349                                                 "length for option %d\n",
  350                                                 __func__, ptr[off]));
  351 
  352                                         m_freem(m);
  353                                         return EINVAL;
  354                                 }
  355 
  356                                 off += ptr[off + 1];
  357                                 break;
  358 
  359                         case IPOPT_LSRR:
  360                         case IPOPT_SSRR:
  361                                 /* Sanity check for option length. */
  362                                 if (ptr[off + 1] < 2) {
  363                                         DPRINTF(("%s: illegal IPv4 option "
  364                                                 "length for option %d\n",
  365                                                 __func__, ptr[off]));
  366 
  367                                         m_freem(m);
  368                                         return EINVAL;
  369                                 }
  370 
  371                                 /*
  372                                  * On output, if we have either of the
  373                                  * source routing options, we should
  374                                  * swap the destination address of the
  375                                  * IP header with the last address
  376                                  * specified in the option, as that is
  377                                  * what the destination's IP header
  378                                  * will look like.
  379                                  */
  380                                 if (out)
  381                                         bcopy(ptr + off + ptr[off + 1] -
  382                                             sizeof(struct in_addr),
  383                                             &(ip->ip_dst), sizeof(struct in_addr));
  384 
  385                                 /* Fall through */
  386                         default:
  387                                 /* Sanity check for option length. */
  388                                 if (ptr[off + 1] < 2) {
  389                                         DPRINTF(("%s: illegal IPv4 option "
  390                                                 "length for option %d\n",
  391                                                 __func__, ptr[off]));
  392                                         m_freem(m);
  393                                         return EINVAL;
  394                                 }
  395 
  396                                 /* Zeroize all other options. */
  397                                 count = ptr[off + 1];
  398                                 bcopy(ipseczeroes, ptr + off, count);
  399                                 off += count;
  400                                 break;
  401                         }
  402 
  403                         /* Sanity check. */
  404                         if (off > skip) {
  405                                 DPRINTF(("%s: malformed IPv4 options header\n",
  406                                         __func__));
  407 
  408                                 m_freem(m);
  409                                 return EINVAL;
  410                         }
  411                 }
  412 
  413                 break;
  414 #endif /* INET */
  415 
  416 #ifdef INET6
  417         case AF_INET6:  /* Ugly... */
  418                 /* Copy and "cook" the IPv6 header. */
  419                 m_copydata(m, 0, sizeof(ip6), (caddr_t) &ip6);
  420 
  421                 /* We don't do IPv6 Jumbograms. */
  422                 if (ip6.ip6_plen == 0) {
  423                         DPRINTF(("%s: unsupported IPv6 jumbogram\n", __func__));
  424                         m_freem(m);
  425                         return EMSGSIZE;
  426                 }
  427 
  428                 ip6.ip6_flow = 0;
  429                 ip6.ip6_hlim = 0;
  430                 ip6.ip6_vfc &= ~IPV6_VERSION_MASK;
  431                 ip6.ip6_vfc |= IPV6_VERSION;
  432 
  433                 /* Scoped address handling. */
  434                 if (IN6_IS_SCOPE_LINKLOCAL(&ip6.ip6_src))
  435                         ip6.ip6_src.s6_addr16[1] = 0;
  436                 if (IN6_IS_SCOPE_LINKLOCAL(&ip6.ip6_dst))
  437                         ip6.ip6_dst.s6_addr16[1] = 0;
  438 
  439                 /* Done with IPv6 header. */
  440                 m_copyback(m, 0, sizeof(struct ip6_hdr), (caddr_t) &ip6);
  441 
  442                 /* Let's deal with the remaining headers (if any). */
  443                 if (skip - sizeof(struct ip6_hdr) > 0) {
  444                         if (m->m_len <= skip) {
  445                                 ptr = (unsigned char *) malloc(
  446                                     skip - sizeof(struct ip6_hdr),
  447                                     M_XDATA, M_NOWAIT);
  448                                 if (ptr == NULL) {
  449                                         DPRINTF(("%s: failed to allocate memory"
  450                                                 "for IPv6 headers\n",__func__));
  451                                         m_freem(m);
  452                                         return ENOBUFS;
  453                                 }
  454 
  455                                 /*
  456                                  * Copy all the protocol headers after
  457                                  * the IPv6 header.
  458                                  */
  459                                 m_copydata(m, sizeof(struct ip6_hdr),
  460                                     skip - sizeof(struct ip6_hdr), ptr);
  461                                 alloc = 1;
  462                         } else {
  463                                 /* No need to allocate memory. */
  464                                 ptr = mtod(m, unsigned char *) +
  465                                     sizeof(struct ip6_hdr);
  466                                 alloc = 0;
  467                         }
  468                 } else
  469                         break;
  470 
  471                 nxt = ip6.ip6_nxt & 0xff; /* Next header type. */
  472 
  473                 for (off = 0; off < skip - sizeof(struct ip6_hdr);)
  474                         switch (nxt) {
  475                         case IPPROTO_HOPOPTS:
  476                         case IPPROTO_DSTOPTS:
  477                                 ip6e = (struct ip6_ext *)(ptr + off);
  478                                 noff = off + ((ip6e->ip6e_len + 1) << 3);
  479 
  480                                 /* Sanity check. */
  481                                 if (noff > skip - sizeof(struct ip6_hdr))
  482                                         goto error6;
  483 
  484                                 /*
  485                                  * Zero out mutable options.
  486                                  */
  487                                 for (count = off + sizeof(struct ip6_ext);
  488                                      count < noff;) {
  489                                         if (ptr[count] == IP6OPT_PAD1) {
  490                                                 count++;
  491                                                 continue; /* Skip padding. */
  492                                         }
  493 
  494                                         ad = ptr[count + 1] + 2;
  495                                         if (count + ad > noff)
  496                                                 goto error6;
  497 
  498                                         if (ptr[count] & IP6OPT_MUTABLE)
  499                                                 memset(ptr + count, 0, ad);
  500                                         count += ad;
  501                                 }
  502 
  503                                 if (count != noff)
  504                                         goto error6;
  505 
  506                                 /* Advance. */
  507                                 off += ((ip6e->ip6e_len + 1) << 3);
  508                                 nxt = ip6e->ip6e_nxt;
  509                                 break;
  510 
  511                         case IPPROTO_ROUTING:
  512                                 /*
  513                                  * Always include routing headers in
  514                                  * computation.
  515                                  */
  516                                 ip6e = (struct ip6_ext *) (ptr + off);
  517                                 off += ((ip6e->ip6e_len + 1) << 3);
  518                                 nxt = ip6e->ip6e_nxt;
  519                                 break;
  520 
  521                         default:
  522                                 DPRINTF(("%s: unexpected IPv6 header type %d",
  523                                         __func__, off));
  524 error6:
  525                                 if (alloc)
  526                                         free(ptr, M_XDATA);
  527                                 m_freem(m);
  528                                 return EINVAL;
  529                         }
  530 
  531                 /* Copyback and free, if we allocated. */
  532                 if (alloc) {
  533                         m_copyback(m, sizeof(struct ip6_hdr),
  534                             skip - sizeof(struct ip6_hdr), ptr);
  535                         free(ptr, M_XDATA);
  536                 }
  537 
  538                 break;
  539 #endif /* INET6 */
  540         }
  541 
  542         return 0;
  543 }
  544 
  545 /*
  546  * ah_input() gets called to verify that an input packet
  547  * passes authentication.
  548  */
  549 static int
  550 ah_input(struct mbuf *m, struct secasvar *sav, int skip, int protoff)
  551 {
  552         struct auth_hash *ahx;
  553         struct tdb_ident *tdbi;
  554         struct tdb_crypto *tc;
  555         struct m_tag *mtag;
  556         struct newah *ah;
  557         int hl, rplen, authsize;
  558 
  559         struct cryptodesc *crda;
  560         struct cryptop *crp;
  561 
  562         IPSEC_ASSERT(sav != NULL, ("null SA"));
  563         IPSEC_ASSERT(sav->key_auth != NULL, ("null authentication key"));
  564         IPSEC_ASSERT(sav->tdb_authalgxform != NULL,
  565                 ("null authentication xform"));
  566 
  567         /* Figure out header size. */
  568         rplen = HDRSIZE(sav);
  569 
  570         /* XXX don't pullup, just copy header */
  571         IP6_EXTHDR_GET(ah, struct newah *, m, skip, rplen);
  572         if (ah == NULL) {
  573                 DPRINTF(("ah_input: cannot pullup header\n"));
  574                 AHSTAT_INC(ahs_hdrops);         /*XXX*/
  575                 m_freem(m);
  576                 return ENOBUFS;
  577         }
  578 
  579         /* Check replay window, if applicable. */
  580         if (sav->replay && !ipsec_chkreplay(ntohl(ah->ah_seq), sav)) {
  581                 AHSTAT_INC(ahs_replay);
  582                 DPRINTF(("%s: packet replay failure: %s\n", __func__,
  583                           ipsec_logsastr(sav)));
  584                 m_freem(m);
  585                 return ENOBUFS;
  586         }
  587 
  588         /* Verify AH header length. */
  589         hl = ah->ah_len * sizeof (u_int32_t);
  590         ahx = sav->tdb_authalgxform;
  591         authsize = AUTHSIZE(sav);
  592         if (hl != authsize + rplen - sizeof (struct ah)) {
  593                 DPRINTF(("%s: bad authenticator length %u (expecting %lu)"
  594                         " for packet in SA %s/%08lx\n", __func__,
  595                         hl, (u_long) (authsize + rplen - sizeof (struct ah)),
  596                         ipsec_address(&sav->sah->saidx.dst),
  597                         (u_long) ntohl(sav->spi)));
  598                 AHSTAT_INC(ahs_badauthl);
  599                 m_freem(m);
  600                 return EACCES;
  601         }
  602         if (skip + authsize + rplen > m->m_pkthdr.len) {
  603                 DPRINTF(("%s: bad mbuf length %u (expecting %lu)"
  604                     " for packet in SA %s/%08lx\n", __func__,
  605                     m->m_pkthdr.len, (u_long) (skip + authsize + rplen),
  606                     ipsec_address(&sav->sah->saidx.dst),
  607                     (u_long) ntohl(sav->spi)));
  608                 AHSTAT_INC(ahs_badauthl);
  609                 m_freem(m);
  610                 return EACCES;
  611         }
  612         AHSTAT_ADD(ahs_ibytes, m->m_pkthdr.len - skip - hl);
  613 
  614         /* Get crypto descriptors. */
  615         crp = crypto_getreq(1);
  616         if (crp == NULL) {
  617                 DPRINTF(("%s: failed to acquire crypto descriptor\n",__func__));
  618                 AHSTAT_INC(ahs_crypto);
  619                 m_freem(m);
  620                 return ENOBUFS;
  621         }
  622 
  623         crda = crp->crp_desc;
  624         IPSEC_ASSERT(crda != NULL, ("null crypto descriptor"));
  625 
  626         crda->crd_skip = 0;
  627         crda->crd_len = m->m_pkthdr.len;
  628         crda->crd_inject = skip + rplen;
  629 
  630         /* Authentication operation. */
  631         crda->crd_alg = ahx->type;
  632         crda->crd_klen = _KEYBITS(sav->key_auth);
  633         crda->crd_key = sav->key_auth->key_data;
  634 
  635         /* Find out if we've already done crypto. */
  636         for (mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_CRYPTO_DONE, NULL);
  637              mtag != NULL;
  638              mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_CRYPTO_DONE, mtag)) {
  639                 tdbi = (struct tdb_ident *) (mtag + 1);
  640                 if (tdbi->proto == sav->sah->saidx.proto &&
  641                     tdbi->spi == sav->spi &&
  642                     !bcmp(&tdbi->dst, &sav->sah->saidx.dst,
  643                           sizeof (union sockaddr_union)))
  644                         break;
  645         }
  646 
  647         /* Allocate IPsec-specific opaque crypto info. */
  648         if (mtag == NULL) {
  649                 tc = (struct tdb_crypto *) malloc(sizeof (struct tdb_crypto) +
  650                         skip + rplen + authsize, M_XDATA, M_NOWAIT|M_ZERO);
  651         } else {
  652                 /* Hash verification has already been done successfully. */
  653                 tc = (struct tdb_crypto *) malloc(sizeof (struct tdb_crypto),
  654                                                     M_XDATA, M_NOWAIT|M_ZERO);
  655         }
  656         if (tc == NULL) {
  657                 DPRINTF(("%s: failed to allocate tdb_crypto\n", __func__));
  658                 AHSTAT_INC(ahs_crypto);
  659                 crypto_freereq(crp);
  660                 m_freem(m);
  661                 return ENOBUFS;
  662         }
  663 
  664         /* Only save information if crypto processing is needed. */
  665         if (mtag == NULL) {
  666                 int error;
  667 
  668                 /*
  669                  * Save the authenticator, the skipped portion of the packet,
  670                  * and the AH header.
  671                  */
  672                 m_copydata(m, 0, skip + rplen + authsize, (caddr_t)(tc+1));
  673 
  674                 /* Zeroize the authenticator on the packet. */
  675                 m_copyback(m, skip + rplen, authsize, ipseczeroes);
  676 
  677                 /* Save ah_nxt, since ah pointer can become invalid after "massage" */
  678                 hl = ah->ah_nxt;
  679 
  680                 /* "Massage" the packet headers for crypto processing. */
  681                 error = ah_massage_headers(&m, sav->sah->saidx.dst.sa.sa_family,
  682                     skip, ahx->type, 0);
  683                 if (error != 0) {
  684                         /* NB: mbuf is free'd by ah_massage_headers */
  685                         AHSTAT_INC(ahs_hdrops);
  686                         free(tc, M_XDATA);
  687                         crypto_freereq(crp);
  688                         return error;
  689                 }
  690         }
  691 
  692         /* Crypto operation descriptor. */
  693         crp->crp_ilen = m->m_pkthdr.len; /* Total input length. */
  694         crp->crp_flags = CRYPTO_F_IMBUF | CRYPTO_F_CBIFSYNC;
  695         crp->crp_buf = (caddr_t) m;
  696         crp->crp_callback = ah_input_cb;
  697         crp->crp_sid = sav->tdb_cryptoid;
  698         crp->crp_opaque = (caddr_t) tc;
  699 
  700         /* These are passed as-is to the callback. */
  701         tc->tc_spi = sav->spi;
  702         tc->tc_dst = sav->sah->saidx.dst;
  703         tc->tc_proto = sav->sah->saidx.proto;
  704         tc->tc_nxt = hl;
  705         tc->tc_protoff = protoff;
  706         tc->tc_skip = skip;
  707         tc->tc_ptr = (caddr_t) mtag; /* Save the mtag we've identified. */
  708         KEY_ADDREFSA(sav);
  709         tc->tc_sav = sav;
  710 
  711         if (mtag == NULL)
  712                 return crypto_dispatch(crp);
  713         else
  714                 return ah_input_cb(crp);
  715 }
  716 
  717 /*
  718  * AH input callback from the crypto driver.
  719  */
  720 static int
  721 ah_input_cb(struct cryptop *crp)
  722 {
  723         int rplen, error, skip, protoff;
  724         unsigned char calc[AH_ALEN_MAX];
  725         struct mbuf *m;
  726         struct cryptodesc *crd;
  727         struct auth_hash *ahx;
  728         struct tdb_crypto *tc;
  729         struct m_tag *mtag;
  730         struct secasvar *sav;
  731         struct secasindex *saidx;
  732         u_int8_t nxt;
  733         caddr_t ptr;
  734         int authsize;
  735 
  736         crd = crp->crp_desc;
  737 
  738         tc = (struct tdb_crypto *) crp->crp_opaque;
  739         IPSEC_ASSERT(tc != NULL, ("null opaque crypto data area!"));
  740         skip = tc->tc_skip;
  741         nxt = tc->tc_nxt;
  742         protoff = tc->tc_protoff;
  743         mtag = (struct m_tag *) tc->tc_ptr;
  744         m = (struct mbuf *) crp->crp_buf;
  745 
  746         sav = tc->tc_sav;
  747         IPSEC_ASSERT(sav != NULL, ("null SA!"));
  748 
  749         saidx = &sav->sah->saidx;
  750         IPSEC_ASSERT(saidx->dst.sa.sa_family == AF_INET ||
  751                 saidx->dst.sa.sa_family == AF_INET6,
  752                 ("unexpected protocol family %u", saidx->dst.sa.sa_family));
  753 
  754         ahx = (struct auth_hash *) sav->tdb_authalgxform;
  755 
  756         /* Check for crypto errors. */
  757         if (crp->crp_etype) {
  758                 if (sav->tdb_cryptoid != 0)
  759                         sav->tdb_cryptoid = crp->crp_sid;
  760 
  761                 if (crp->crp_etype == EAGAIN)
  762                         return (crypto_dispatch(crp));
  763 
  764                 AHSTAT_INC(ahs_noxform);
  765                 DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype));
  766                 error = crp->crp_etype;
  767                 goto bad;
  768         } else {
  769                 AHSTAT_INC(ahs_hist[sav->alg_auth]);
  770                 crypto_freereq(crp);            /* No longer needed. */
  771                 crp = NULL;
  772         }
  773 
  774         /* Shouldn't happen... */
  775         if (m == NULL) {
  776                 AHSTAT_INC(ahs_crypto);
  777                 DPRINTF(("%s: bogus returned buffer from crypto\n", __func__));
  778                 error = EINVAL;
  779                 goto bad;
  780         }
  781 
  782         /* Figure out header size. */
  783         rplen = HDRSIZE(sav);
  784         authsize = AUTHSIZE(sav);
  785 
  786         /* Copy authenticator off the packet. */
  787         m_copydata(m, skip + rplen, authsize, calc);
  788 
  789         /*
  790          * If we have an mtag, we don't need to verify the authenticator --
  791          * it has been verified by an IPsec-aware NIC.
  792          */
  793         if (mtag == NULL) {
  794                 ptr = (caddr_t) (tc + 1);
  795 
  796                 /* Verify authenticator. */
  797                 if (bcmp(ptr + skip + rplen, calc, authsize)) {
  798                         DPRINTF(("%s: authentication hash mismatch for packet "
  799                             "in SA %s/%08lx\n", __func__,
  800                             ipsec_address(&saidx->dst),
  801                             (u_long) ntohl(sav->spi)));
  802                         AHSTAT_INC(ahs_badauth);
  803                         error = EACCES;
  804                         goto bad;
  805                 }
  806 
  807                 /* Fix the Next Protocol field. */
  808                 ((u_int8_t *) ptr)[protoff] = nxt;
  809 
  810                 /* Copyback the saved (uncooked) network headers. */
  811                 m_copyback(m, 0, skip, ptr);
  812         } else {
  813                 /* Fix the Next Protocol field. */
  814                 m_copyback(m, protoff, sizeof(u_int8_t), &nxt);
  815         }
  816 
  817         free(tc, M_XDATA), tc = NULL;                   /* No longer needed */
  818 
  819         /*
  820          * Header is now authenticated.
  821          */
  822         m->m_flags |= M_AUTHIPHDR|M_AUTHIPDGM;
  823 
  824         /*
  825          * Update replay sequence number, if appropriate.
  826          */
  827         if (sav->replay) {
  828                 u_int32_t seq;
  829 
  830                 m_copydata(m, skip + offsetof(struct newah, ah_seq),
  831                            sizeof (seq), (caddr_t) &seq);
  832                 if (ipsec_updatereplay(ntohl(seq), sav)) {
  833                         AHSTAT_INC(ahs_replay);
  834                         error = ENOBUFS;                        /*XXX as above*/
  835                         goto bad;
  836                 }
  837         }
  838 
  839         /*
  840          * Remove the AH header and authenticator from the mbuf.
  841          */
  842         error = m_striphdr(m, skip, rplen + authsize);
  843         if (error) {
  844                 DPRINTF(("%s: mangled mbuf chain for SA %s/%08lx\n", __func__,
  845                     ipsec_address(&saidx->dst), (u_long) ntohl(sav->spi)));
  846 
  847                 AHSTAT_INC(ahs_hdrops);
  848                 goto bad;
  849         }
  850 
  851         switch (saidx->dst.sa.sa_family) {
  852 #ifdef INET6
  853         case AF_INET6:
  854                 error = ipsec6_common_input_cb(m, sav, skip, protoff, mtag);
  855                 break;
  856 #endif
  857 #ifdef INET
  858         case AF_INET:
  859                 error = ipsec4_common_input_cb(m, sav, skip, protoff, mtag);
  860                 break;
  861 #endif
  862         default:
  863                 panic("%s: Unexpected address family: %d saidx=%p", __func__,
  864                     saidx->dst.sa.sa_family, saidx);
  865         }
  866 
  867         KEY_FREESAV(&sav);
  868         return error;
  869 bad:
  870         if (sav)
  871                 KEY_FREESAV(&sav);
  872         if (m != NULL)
  873                 m_freem(m);
  874         if (tc != NULL)
  875                 free(tc, M_XDATA);
  876         if (crp != NULL)
  877                 crypto_freereq(crp);
  878         return error;
  879 }
  880 
  881 /*
  882  * AH output routine, called by ipsec[46]_process_packet().
  883  */
  884 static int
  885 ah_output(
  886         struct mbuf *m,
  887         struct ipsecrequest *isr,
  888         struct mbuf **mp,
  889         int skip,
  890         int protoff)
  891 {
  892         struct secasvar *sav;
  893         struct auth_hash *ahx;
  894         struct cryptodesc *crda;
  895         struct tdb_crypto *tc;
  896         struct mbuf *mi;
  897         struct cryptop *crp;
  898         u_int16_t iplen;
  899         int error, rplen, authsize, maxpacketsize, roff;
  900         u_int8_t prot;
  901         struct newah *ah;
  902 
  903         sav = isr->sav;
  904         IPSEC_ASSERT(sav != NULL, ("null SA"));
  905         ahx = sav->tdb_authalgxform;
  906         IPSEC_ASSERT(ahx != NULL, ("null authentication xform"));
  907 
  908         AHSTAT_INC(ahs_output);
  909 
  910         /* Figure out header size. */
  911         rplen = HDRSIZE(sav);
  912 
  913         /* Check for maximum packet size violations. */
  914         switch (sav->sah->saidx.dst.sa.sa_family) {
  915 #ifdef INET
  916         case AF_INET:
  917                 maxpacketsize = IP_MAXPACKET;
  918                 break;
  919 #endif /* INET */
  920 #ifdef INET6
  921         case AF_INET6:
  922                 maxpacketsize = IPV6_MAXPACKET;
  923                 break;
  924 #endif /* INET6 */
  925         default:
  926                 DPRINTF(("%s: unknown/unsupported protocol family %u, "
  927                     "SA %s/%08lx\n", __func__,
  928                     sav->sah->saidx.dst.sa.sa_family,
  929                     ipsec_address(&sav->sah->saidx.dst),
  930                     (u_long) ntohl(sav->spi)));
  931                 AHSTAT_INC(ahs_nopf);
  932                 error = EPFNOSUPPORT;
  933                 goto bad;
  934         }
  935         authsize = AUTHSIZE(sav);
  936         if (rplen + authsize + m->m_pkthdr.len > maxpacketsize) {
  937                 DPRINTF(("%s: packet in SA %s/%08lx got too big "
  938                     "(len %u, max len %u)\n", __func__,
  939                     ipsec_address(&sav->sah->saidx.dst),
  940                     (u_long) ntohl(sav->spi),
  941                     rplen + authsize + m->m_pkthdr.len, maxpacketsize));
  942                 AHSTAT_INC(ahs_toobig);
  943                 error = EMSGSIZE;
  944                 goto bad;
  945         }
  946 
  947         /* Update the counters. */
  948         AHSTAT_ADD(ahs_obytes, m->m_pkthdr.len - skip);
  949 
  950         m = m_unshare(m, M_NOWAIT);
  951         if (m == NULL) {
  952                 DPRINTF(("%s: cannot clone mbuf chain, SA %s/%08lx\n", __func__,
  953                     ipsec_address(&sav->sah->saidx.dst),
  954                     (u_long) ntohl(sav->spi)));
  955                 AHSTAT_INC(ahs_hdrops);
  956                 error = ENOBUFS;
  957                 goto bad;
  958         }
  959 
  960         /* Inject AH header. */
  961         mi = m_makespace(m, skip, rplen + authsize, &roff);
  962         if (mi == NULL) {
  963                 DPRINTF(("%s: failed to inject %u byte AH header for SA "
  964                     "%s/%08lx\n", __func__,
  965                     rplen + authsize,
  966                     ipsec_address(&sav->sah->saidx.dst),
  967                     (u_long) ntohl(sav->spi)));
  968                 AHSTAT_INC(ahs_hdrops);         /*XXX differs from openbsd */
  969                 error = ENOBUFS;
  970                 goto bad;
  971         }
  972 
  973         /*
  974          * The AH header is guaranteed by m_makespace() to be in
  975          * contiguous memory, at roff bytes offset into the returned mbuf.
  976          */
  977         ah = (struct newah *)(mtod(mi, caddr_t) + roff);
  978 
  979         /* Initialize the AH header. */
  980         m_copydata(m, protoff, sizeof(u_int8_t), (caddr_t) &ah->ah_nxt);
  981         ah->ah_len = (rplen + authsize - sizeof(struct ah)) / sizeof(u_int32_t);
  982         ah->ah_reserve = 0;
  983         ah->ah_spi = sav->spi;
  984 
  985         /* Zeroize authenticator. */
  986         m_copyback(m, skip + rplen, authsize, ipseczeroes);
  987 
  988         /* Insert packet replay counter, as requested.  */
  989         if (sav->replay) {
  990                 if (sav->replay->count == ~0 &&
  991                     (sav->flags & SADB_X_EXT_CYCSEQ) == 0) {
  992                         DPRINTF(("%s: replay counter wrapped for SA %s/%08lx\n",
  993                                 __func__,
  994                                 ipsec_address(&sav->sah->saidx.dst),
  995                                 (u_long) ntohl(sav->spi)));
  996                         AHSTAT_INC(ahs_wrap);
  997                         error = EINVAL;
  998                         goto bad;
  999                 }
 1000 #ifdef REGRESSION
 1001                 /* Emulate replay attack when ipsec_replay is TRUE. */
 1002                 if (!V_ipsec_replay)
 1003 #endif
 1004                         sav->replay->count++;
 1005                 ah->ah_seq = htonl(sav->replay->count);
 1006         }
 1007 
 1008         /* Get crypto descriptors. */
 1009         crp = crypto_getreq(1);
 1010         if (crp == NULL) {
 1011                 DPRINTF(("%s: failed to acquire crypto descriptors\n",
 1012                         __func__));
 1013                 AHSTAT_INC(ahs_crypto);
 1014                 error = ENOBUFS;
 1015                 goto bad;
 1016         }
 1017 
 1018         crda = crp->crp_desc;
 1019 
 1020         crda->crd_skip = 0;
 1021         crda->crd_inject = skip + rplen;
 1022         crda->crd_len = m->m_pkthdr.len;
 1023 
 1024         /* Authentication operation. */
 1025         crda->crd_alg = ahx->type;
 1026         crda->crd_key = sav->key_auth->key_data;
 1027         crda->crd_klen = _KEYBITS(sav->key_auth);
 1028 
 1029         /* Allocate IPsec-specific opaque crypto info. */
 1030         tc = (struct tdb_crypto *) malloc(
 1031                 sizeof(struct tdb_crypto) + skip, M_XDATA, M_NOWAIT|M_ZERO);
 1032         if (tc == NULL) {
 1033                 crypto_freereq(crp);
 1034                 DPRINTF(("%s: failed to allocate tdb_crypto\n", __func__));
 1035                 AHSTAT_INC(ahs_crypto);
 1036                 error = ENOBUFS;
 1037                 goto bad;
 1038         }
 1039 
 1040         /* Save the skipped portion of the packet. */
 1041         m_copydata(m, 0, skip, (caddr_t) (tc + 1));
 1042 
 1043         /*
 1044          * Fix IP header length on the header used for
 1045          * authentication. We don't need to fix the original
 1046          * header length as it will be fixed by our caller.
 1047          */
 1048         switch (sav->sah->saidx.dst.sa.sa_family) {
 1049 #ifdef INET
 1050         case AF_INET:
 1051                 bcopy(((caddr_t)(tc + 1)) +
 1052                     offsetof(struct ip, ip_len),
 1053                     (caddr_t) &iplen, sizeof(u_int16_t));
 1054                 iplen = htons(ntohs(iplen) + rplen + authsize);
 1055                 m_copyback(m, offsetof(struct ip, ip_len),
 1056                     sizeof(u_int16_t), (caddr_t) &iplen);
 1057                 break;
 1058 #endif /* INET */
 1059 
 1060 #ifdef INET6
 1061         case AF_INET6:
 1062                 bcopy(((caddr_t)(tc + 1)) +
 1063                     offsetof(struct ip6_hdr, ip6_plen),
 1064                     (caddr_t) &iplen, sizeof(u_int16_t));
 1065                 iplen = htons(ntohs(iplen) + rplen + authsize);
 1066                 m_copyback(m, offsetof(struct ip6_hdr, ip6_plen),
 1067                     sizeof(u_int16_t), (caddr_t) &iplen);
 1068                 break;
 1069 #endif /* INET6 */
 1070         }
 1071 
 1072         /* Fix the Next Header field in saved header. */
 1073         ((u_int8_t *) (tc + 1))[protoff] = IPPROTO_AH;
 1074 
 1075         /* Update the Next Protocol field in the IP header. */
 1076         prot = IPPROTO_AH;
 1077         m_copyback(m, protoff, sizeof(u_int8_t), (caddr_t) &prot);
 1078 
 1079         /* "Massage" the packet headers for crypto processing. */
 1080         error = ah_massage_headers(&m, sav->sah->saidx.dst.sa.sa_family,
 1081                         skip, ahx->type, 1);
 1082         if (error != 0) {
 1083                 m = NULL;       /* mbuf was free'd by ah_massage_headers. */
 1084                 free(tc, M_XDATA);
 1085                 crypto_freereq(crp);
 1086                 goto bad;
 1087         }
 1088 
 1089         /* Crypto operation descriptor. */
 1090         crp->crp_ilen = m->m_pkthdr.len; /* Total input length. */
 1091         crp->crp_flags = CRYPTO_F_IMBUF | CRYPTO_F_CBIFSYNC;
 1092         crp->crp_buf = (caddr_t) m;
 1093         crp->crp_callback = ah_output_cb;
 1094         crp->crp_sid = sav->tdb_cryptoid;
 1095         crp->crp_opaque = (caddr_t) tc;
 1096 
 1097         /* These are passed as-is to the callback. */
 1098         tc->tc_isr = isr;
 1099         KEY_ADDREFSA(sav);
 1100         tc->tc_sav = sav;
 1101         tc->tc_spi = sav->spi;
 1102         tc->tc_dst = sav->sah->saidx.dst;
 1103         tc->tc_proto = sav->sah->saidx.proto;
 1104         tc->tc_skip = skip;
 1105         tc->tc_protoff = protoff;
 1106 
 1107         return crypto_dispatch(crp);
 1108 bad:
 1109         if (m)
 1110                 m_freem(m);
 1111         return (error);
 1112 }
 1113 
 1114 /*
 1115  * AH output callback from the crypto driver.
 1116  */
 1117 static int
 1118 ah_output_cb(struct cryptop *crp)
 1119 {
 1120         int skip, protoff, error;
 1121         struct tdb_crypto *tc;
 1122         struct ipsecrequest *isr;
 1123         struct secasvar *sav;
 1124         struct mbuf *m;
 1125         caddr_t ptr;
 1126 
 1127         tc = (struct tdb_crypto *) crp->crp_opaque;
 1128         IPSEC_ASSERT(tc != NULL, ("null opaque data area!"));
 1129         skip = tc->tc_skip;
 1130         protoff = tc->tc_protoff;
 1131         ptr = (caddr_t) (tc + 1);
 1132         m = (struct mbuf *) crp->crp_buf;
 1133 
 1134         isr = tc->tc_isr;
 1135         IPSECREQUEST_LOCK(isr);
 1136         sav = tc->tc_sav;
 1137         /* With the isr lock released SA pointer can be updated. */
 1138         if (sav != isr->sav) {
 1139                 AHSTAT_INC(ahs_notdb);
 1140                 DPRINTF(("%s: SA expired while in crypto\n", __func__));
 1141                 error = ENOBUFS;                /*XXX*/
 1142                 goto bad;
 1143         }
 1144 
 1145         /* Check for crypto errors. */
 1146         if (crp->crp_etype) {
 1147                 if (sav->tdb_cryptoid != 0)
 1148                         sav->tdb_cryptoid = crp->crp_sid;
 1149 
 1150                 if (crp->crp_etype == EAGAIN) {
 1151                         IPSECREQUEST_UNLOCK(isr);
 1152                         return (crypto_dispatch(crp));
 1153                 }
 1154 
 1155                 AHSTAT_INC(ahs_noxform);
 1156                 DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype));
 1157                 error = crp->crp_etype;
 1158                 goto bad;
 1159         }
 1160 
 1161         /* Shouldn't happen... */
 1162         if (m == NULL) {
 1163                 AHSTAT_INC(ahs_crypto);
 1164                 DPRINTF(("%s: bogus returned buffer from crypto\n", __func__));
 1165                 error = EINVAL;
 1166                 goto bad;
 1167         }
 1168         AHSTAT_INC(ahs_hist[sav->alg_auth]);
 1169 
 1170         /*
 1171          * Copy original headers (with the new protocol number) back
 1172          * in place.
 1173          */
 1174         m_copyback(m, 0, skip, ptr);
 1175 
 1176         /* No longer needed. */
 1177         free(tc, M_XDATA);
 1178         crypto_freereq(crp);
 1179 
 1180 #ifdef REGRESSION
 1181         /* Emulate man-in-the-middle attack when ipsec_integrity is TRUE. */
 1182         if (V_ipsec_integrity) {
 1183                 int alen;
 1184 
 1185                 /*
 1186                  * Corrupt HMAC if we want to test integrity verification of
 1187                  * the other side.
 1188                  */
 1189                 alen = AUTHSIZE(sav);
 1190                 m_copyback(m, m->m_pkthdr.len - alen, alen, ipseczeroes);
 1191         }
 1192 #endif
 1193 
 1194         /* NB: m is reclaimed by ipsec_process_done. */
 1195         error = ipsec_process_done(m, isr);
 1196         KEY_FREESAV(&sav);
 1197         IPSECREQUEST_UNLOCK(isr);
 1198         return error;
 1199 bad:
 1200         if (sav)
 1201                 KEY_FREESAV(&sav);
 1202         IPSECREQUEST_UNLOCK(isr);
 1203         if (m)
 1204                 m_freem(m);
 1205         free(tc, M_XDATA);
 1206         crypto_freereq(crp);
 1207         return error;
 1208 }
 1209 
 1210 static struct xformsw ah_xformsw = {
 1211         XF_AH,          XFT_AUTH,       "IPsec AH",
 1212         ah_init,        ah_zeroize,     ah_input,       ah_output,
 1213 };
 1214 
 1215 static void
 1216 ah_attach(void)
 1217 {
 1218 
 1219         xform_register(&ah_xformsw);
 1220 }
 1221 
 1222 SYSINIT(ah_xform_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, ah_attach, NULL);

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