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/10.1/sys/netipsec/xform_ah.c 253088 2013-07-09 10:08:13Z ae $  */
    2 /*      $OpenBSD: ip_ah.c,v 1.63 2001/06/26 06:18:58 angelos Exp $ */
    3 /*-
    4  * The authors of this code are John Ioannidis (ji@tla.org),
    5  * Angelos D. Keromytis (kermit@csd.uch.gr) and
    6  * Niels Provos (provos@physnet.uni-hamburg.de).
    7  *
    8  * The original version of this code was written by John Ioannidis
    9  * for BSD/OS in Athens, Greece, in November 1995.
   10  *
   11  * Ported to OpenBSD and NetBSD, with additional transforms, in December 1996,
   12  * by Angelos D. Keromytis.
   13  *
   14  * Additional transforms and features in 1997 and 1998 by Angelos D. Keromytis
   15  * and Niels Provos.
   16  *
   17  * Additional features in 1999 by Angelos D. Keromytis and Niklas Hallqvist.
   18  *
   19  * Copyright (c) 1995, 1996, 1997, 1998, 1999 by John Ioannidis,
   20  * Angelos D. Keromytis and Niels Provos.
   21  * Copyright (c) 1999 Niklas Hallqvist.
   22  * Copyright (c) 2001 Angelos D. Keromytis.
   23  *
   24  * Permission to use, copy, and modify this software with or without fee
   25  * is hereby granted, provided that this entire notice is included in
   26  * all copies of any software which is or includes a copy or
   27  * modification of this software.
   28  * You may use this code under the GNU public license if you so wish. Please
   29  * contribute changes back to the authors under this freer than GPL license
   30  * so that we may further the use of strong encryption without limitations to
   31  * all.
   32  *
   33  * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR
   34  * IMPLIED WARRANTY. IN PARTICULAR, NONE OF THE AUTHORS MAKES ANY
   35  * REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE
   36  * MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR
   37  * PURPOSE.
   38  */
   39 #include "opt_inet.h"
   40 #include "opt_inet6.h"
   41 
   42 #include <sys/param.h>
   43 #include <sys/systm.h>
   44 #include <sys/mbuf.h>
   45 #include <sys/socket.h>
   46 #include <sys/syslog.h>
   47 #include <sys/kernel.h>
   48 #include <sys/sysctl.h>
   49 
   50 #include <net/if.h>
   51 #include <net/vnet.h>
   52 
   53 #include <netinet/in.h>
   54 #include <netinet/in_systm.h>
   55 #include <netinet/ip.h>
   56 #include <netinet/ip_ecn.h>
   57 #include <netinet/ip6.h>
   58 
   59 #include <net/route.h>
   60 #include <netipsec/ipsec.h>
   61 #include <netipsec/ah.h>
   62 #include <netipsec/ah_var.h>
   63 #include <netipsec/xform.h>
   64 
   65 #ifdef INET6
   66 #include <netinet6/ip6_var.h>
   67 #include <netipsec/ipsec6.h>
   68 #include <netinet6/ip6_ecn.h>
   69 #endif
   70 
   71 #include <netipsec/key.h>
   72 #include <netipsec/key_debug.h>
   73 
   74 #include <opencrypto/cryptodev.h>
   75 
   76 /*
   77  * Return header size in bytes.  The old protocol did not support
   78  * the replay counter; the new protocol always includes the counter.
   79  */
   80 #define HDRSIZE(sav) \
   81         (((sav)->flags & SADB_X_EXT_OLD) ? \
   82                 sizeof (struct ah) : sizeof (struct ah) + sizeof (u_int32_t))
   83 /* 
   84  * Return authenticator size in bytes.  The old protocol is known
   85  * to use a fixed 16-byte authenticator.  The new algorithm use 12-byte
   86  * authenticator.
   87  */
   88 #define AUTHSIZE(sav)   ah_authsize(sav)
   89 
   90 VNET_DEFINE(int, ah_enable) = 1;        /* control flow of packets with AH */
   91 VNET_DEFINE(int, ah_cleartos) = 1;      /* clear ip_tos when doing AH calc */
   92 VNET_PCPUSTAT_DEFINE(struct ahstat, ahstat);
   93 VNET_PCPUSTAT_SYSINIT(ahstat);
   94 
   95 #ifdef VIMAGE
   96 VNET_PCPUSTAT_SYSUNINIT(ahstat);
   97 #endif /* VIMAGE */
   98 
   99 #ifdef INET
  100 SYSCTL_DECL(_net_inet_ah);
  101 SYSCTL_VNET_INT(_net_inet_ah, OID_AUTO,
  102         ah_enable,      CTLFLAG_RW,     &VNET_NAME(ah_enable),  0, "");
  103 SYSCTL_VNET_INT(_net_inet_ah, OID_AUTO,
  104         ah_cleartos,    CTLFLAG_RW,     &VNET_NAME(ah_cleartos), 0, "");
  105 SYSCTL_VNET_PCPUSTAT(_net_inet_ah, IPSECCTL_STATS, stats, struct ahstat,
  106     ahstat, "AH statistics (struct ahstat, netipsec/ah_var.h)");
  107 #endif
  108 
  109 static unsigned char ipseczeroes[256];  /* larger than an ip6 extension hdr */
  110 
  111 static int ah_input_cb(struct cryptop*);
  112 static int ah_output_cb(struct cryptop*);
  113 
  114 static int
  115 ah_authsize(struct secasvar *sav)
  116 {
  117 
  118         IPSEC_ASSERT(sav != NULL, ("%s: sav == NULL", __func__));
  119 
  120         if (sav->flags & SADB_X_EXT_OLD)
  121                 return 16;
  122 
  123         switch (sav->alg_auth) {
  124         case SADB_X_AALG_SHA2_256:
  125                 return 16;
  126         case SADB_X_AALG_SHA2_384:
  127                 return 24;
  128         case SADB_X_AALG_SHA2_512:
  129                 return 32;
  130         default:
  131                 return AH_HMAC_HASHLEN;
  132         }
  133         /* NOTREACHED */
  134 }
  135 /*
  136  * NB: this is public for use by the PF_KEY support.
  137  */
  138 struct auth_hash *
  139 ah_algorithm_lookup(int alg)
  140 {
  141         if (alg > SADB_AALG_MAX)
  142                 return NULL;
  143         switch (alg) {
  144         case SADB_X_AALG_NULL:
  145                 return &auth_hash_null;
  146         case SADB_AALG_MD5HMAC:
  147                 return &auth_hash_hmac_md5;
  148         case SADB_AALG_SHA1HMAC:
  149                 return &auth_hash_hmac_sha1;
  150         case SADB_X_AALG_RIPEMD160HMAC:
  151                 return &auth_hash_hmac_ripemd_160;
  152         case SADB_X_AALG_MD5:
  153                 return &auth_hash_key_md5;
  154         case SADB_X_AALG_SHA:
  155                 return &auth_hash_key_sha1;
  156         case SADB_X_AALG_SHA2_256:
  157                 return &auth_hash_hmac_sha2_256;
  158         case SADB_X_AALG_SHA2_384:
  159                 return &auth_hash_hmac_sha2_384;
  160         case SADB_X_AALG_SHA2_512:
  161                 return &auth_hash_hmac_sha2_512;
  162         }
  163         return NULL;
  164 }
  165 
  166 size_t
  167 ah_hdrsiz(struct secasvar *sav)
  168 {
  169         size_t size;
  170 
  171         if (sav != NULL) {
  172                 int authsize;
  173                 IPSEC_ASSERT(sav->tdb_authalgxform != NULL, ("null xform"));
  174                 /*XXX not right for null algorithm--does it matter??*/
  175                 authsize = AUTHSIZE(sav);
  176                 size = roundup(authsize, sizeof (u_int32_t)) + HDRSIZE(sav);
  177         } else {
  178                 /* default guess */
  179                 size = sizeof (struct ah) + sizeof (u_int32_t) + 16;
  180         }
  181         return size;
  182 }
  183 
  184 /*
  185  * NB: public for use by esp_init.
  186  */
  187 int
  188 ah_init0(struct secasvar *sav, struct xformsw *xsp, struct cryptoini *cria)
  189 {
  190         struct auth_hash *thash;
  191         int keylen;
  192 
  193         thash = ah_algorithm_lookup(sav->alg_auth);
  194         if (thash == NULL) {
  195                 DPRINTF(("%s: unsupported authentication algorithm %u\n",
  196                         __func__, sav->alg_auth));
  197                 return EINVAL;
  198         }
  199         /*
  200          * Verify the replay state block allocation is consistent with
  201          * the protocol type.  We check here so we can make assumptions
  202          * later during protocol processing.
  203          */
  204         /* NB: replay state is setup elsewhere (sigh) */
  205         if (((sav->flags&SADB_X_EXT_OLD) == 0) ^ (sav->replay != NULL)) {
  206                 DPRINTF(("%s: replay state block inconsistency, "
  207                         "%s algorithm %s replay state\n", __func__,
  208                         (sav->flags & SADB_X_EXT_OLD) ? "old" : "new",
  209                         sav->replay == NULL ? "without" : "with"));
  210                 return EINVAL;
  211         }
  212         if (sav->key_auth == NULL) {
  213                 DPRINTF(("%s: no authentication key for %s algorithm\n",
  214                         __func__, thash->name));
  215                 return EINVAL;
  216         }
  217         keylen = _KEYLEN(sav->key_auth);
  218         if (keylen != thash->keysize && thash->keysize != 0) {
  219                 DPRINTF(("%s: invalid keylength %d, algorithm %s requires "
  220                         "keysize %d\n", __func__,
  221                          keylen, thash->name, thash->keysize));
  222                 return EINVAL;
  223         }
  224 
  225         sav->tdb_xform = xsp;
  226         sav->tdb_authalgxform = thash;
  227 
  228         /* Initialize crypto session. */
  229         bzero(cria, sizeof (*cria));
  230         cria->cri_alg = sav->tdb_authalgxform->type;
  231         cria->cri_klen = _KEYBITS(sav->key_auth);
  232         cria->cri_key = sav->key_auth->key_data;
  233         cria->cri_mlen = AUTHSIZE(sav);
  234 
  235         return 0;
  236 }
  237 
  238 /*
  239  * ah_init() is called when an SPI is being set up.
  240  */
  241 static int
  242 ah_init(struct secasvar *sav, struct xformsw *xsp)
  243 {
  244         struct cryptoini cria;
  245         int error;
  246 
  247         error = ah_init0(sav, xsp, &cria);
  248         return error ? error :
  249                  crypto_newsession(&sav->tdb_cryptoid, &cria, V_crypto_support);
  250 }
  251 
  252 /*
  253  * Paranoia.
  254  *
  255  * NB: public for use by esp_zeroize (XXX).
  256  */
  257 int
  258 ah_zeroize(struct secasvar *sav)
  259 {
  260         int err;
  261 
  262         if (sav->key_auth)
  263                 bzero(sav->key_auth->key_data, _KEYLEN(sav->key_auth));
  264 
  265         err = crypto_freesession(sav->tdb_cryptoid);
  266         sav->tdb_cryptoid = 0;
  267         sav->tdb_authalgxform = NULL;
  268         sav->tdb_xform = NULL;
  269         return err;
  270 }
  271 
  272 /*
  273  * Massage IPv4/IPv6 headers for AH processing.
  274  */
  275 static int
  276 ah_massage_headers(struct mbuf **m0, int proto, int skip, int alg, int out)
  277 {
  278         struct mbuf *m = *m0;
  279         unsigned char *ptr;
  280         int off, count;
  281 
  282 #ifdef INET
  283         struct ip *ip;
  284 #endif /* INET */
  285 
  286 #ifdef INET6
  287         struct ip6_ext *ip6e;
  288         struct ip6_hdr ip6;
  289         int alloc, len, ad;
  290 #endif /* INET6 */
  291 
  292         switch (proto) {
  293 #ifdef INET
  294         case AF_INET:
  295                 /*
  296                  * This is the least painful way of dealing with IPv4 header
  297                  * and option processing -- just make sure they're in
  298                  * contiguous memory.
  299                  */
  300                 *m0 = m = m_pullup(m, skip);
  301                 if (m == NULL) {
  302                         DPRINTF(("%s: m_pullup failed\n", __func__));
  303                         return ENOBUFS;
  304                 }
  305 
  306                 /* Fix the IP header */
  307                 ip = mtod(m, struct ip *);
  308                 if (V_ah_cleartos)
  309                         ip->ip_tos = 0;
  310                 ip->ip_ttl = 0;
  311                 ip->ip_sum = 0;
  312 
  313                 if (alg == CRYPTO_MD5_KPDK || alg == CRYPTO_SHA1_KPDK)
  314                         ip->ip_off &= htons(IP_DF);
  315                 else
  316                         ip->ip_off = htons(0);
  317 
  318                 ptr = mtod(m, unsigned char *) + sizeof(struct ip);
  319 
  320                 /* IPv4 option processing */
  321                 for (off = sizeof(struct ip); off < skip;) {
  322                         if (ptr[off] == IPOPT_EOL || ptr[off] == IPOPT_NOP ||
  323                             off + 1 < skip)
  324                                 ;
  325                         else {
  326                                 DPRINTF(("%s: illegal IPv4 option length for "
  327                                         "option %d\n", __func__, ptr[off]));
  328 
  329                                 m_freem(m);
  330                                 return EINVAL;
  331                         }
  332 
  333                         switch (ptr[off]) {
  334                         case IPOPT_EOL:
  335                                 off = skip;  /* End the loop. */
  336                                 break;
  337 
  338                         case IPOPT_NOP:
  339                                 off++;
  340                                 break;
  341 
  342                         case IPOPT_SECURITY:    /* 0x82 */
  343                         case 0x85:      /* Extended security. */
  344                         case 0x86:      /* Commercial security. */
  345                         case 0x94:      /* Router alert */
  346                         case 0x95:      /* RFC1770 */
  347                                 /* Sanity check for option length. */
  348                                 if (ptr[off + 1] < 2) {
  349                                         DPRINTF(("%s: illegal IPv4 option "
  350                                                 "length for option %d\n",
  351                                                 __func__, ptr[off]));
  352 
  353                                         m_freem(m);
  354                                         return EINVAL;
  355                                 }
  356 
  357                                 off += ptr[off + 1];
  358                                 break;
  359 
  360                         case IPOPT_LSRR:
  361                         case IPOPT_SSRR:
  362                                 /* Sanity check for option length. */
  363                                 if (ptr[off + 1] < 2) {
  364                                         DPRINTF(("%s: illegal IPv4 option "
  365                                                 "length for option %d\n",
  366                                                 __func__, ptr[off]));
  367 
  368                                         m_freem(m);
  369                                         return EINVAL;
  370                                 }
  371 
  372                                 /*
  373                                  * On output, if we have either of the
  374                                  * source routing options, we should
  375                                  * swap the destination address of the
  376                                  * IP header with the last address
  377                                  * specified in the option, as that is
  378                                  * what the destination's IP header
  379                                  * will look like.
  380                                  */
  381                                 if (out)
  382                                         bcopy(ptr + off + ptr[off + 1] -
  383                                             sizeof(struct in_addr),
  384                                             &(ip->ip_dst), sizeof(struct in_addr));
  385 
  386                                 /* Fall through */
  387                         default:
  388                                 /* Sanity check for option length. */
  389                                 if (ptr[off + 1] < 2) {
  390                                         DPRINTF(("%s: illegal IPv4 option "
  391                                                 "length for option %d\n",
  392                                                 __func__, ptr[off]));
  393                                         m_freem(m);
  394                                         return EINVAL;
  395                                 }
  396 
  397                                 /* Zeroize all other options. */
  398                                 count = ptr[off + 1];
  399                                 bcopy(ipseczeroes, ptr, count);
  400                                 off += count;
  401                                 break;
  402                         }
  403 
  404                         /* Sanity check. */
  405                         if (off > skip) {
  406                                 DPRINTF(("%s: malformed IPv4 options header\n",
  407                                         __func__));
  408 
  409                                 m_freem(m);
  410                                 return EINVAL;
  411                         }
  412                 }
  413 
  414                 break;
  415 #endif /* INET */
  416 
  417 #ifdef INET6
  418         case AF_INET6:  /* Ugly... */
  419                 /* Copy and "cook" the IPv6 header. */
  420                 m_copydata(m, 0, sizeof(ip6), (caddr_t) &ip6);
  421 
  422                 /* We don't do IPv6 Jumbograms. */
  423                 if (ip6.ip6_plen == 0) {
  424                         DPRINTF(("%s: unsupported IPv6 jumbogram\n", __func__));
  425                         m_freem(m);
  426                         return EMSGSIZE;
  427                 }
  428 
  429                 ip6.ip6_flow = 0;
  430                 ip6.ip6_hlim = 0;
  431                 ip6.ip6_vfc &= ~IPV6_VERSION_MASK;
  432                 ip6.ip6_vfc |= IPV6_VERSION;
  433 
  434                 /* Scoped address handling. */
  435                 if (IN6_IS_SCOPE_LINKLOCAL(&ip6.ip6_src))
  436                         ip6.ip6_src.s6_addr16[1] = 0;
  437                 if (IN6_IS_SCOPE_LINKLOCAL(&ip6.ip6_dst))
  438                         ip6.ip6_dst.s6_addr16[1] = 0;
  439 
  440                 /* Done with IPv6 header. */
  441                 m_copyback(m, 0, sizeof(struct ip6_hdr), (caddr_t) &ip6);
  442 
  443                 /* Let's deal with the remaining headers (if any). */
  444                 if (skip - sizeof(struct ip6_hdr) > 0) {
  445                         if (m->m_len <= skip) {
  446                                 ptr = (unsigned char *) malloc(
  447                                     skip - sizeof(struct ip6_hdr),
  448                                     M_XDATA, M_NOWAIT);
  449                                 if (ptr == NULL) {
  450                                         DPRINTF(("%s: failed to allocate memory"
  451                                                 "for IPv6 headers\n",__func__));
  452                                         m_freem(m);
  453                                         return ENOBUFS;
  454                                 }
  455 
  456                                 /*
  457                                  * Copy all the protocol headers after
  458                                  * the IPv6 header.
  459                                  */
  460                                 m_copydata(m, sizeof(struct ip6_hdr),
  461                                     skip - sizeof(struct ip6_hdr), ptr);
  462                                 alloc = 1;
  463                         } else {
  464                                 /* No need to allocate memory. */
  465                                 ptr = mtod(m, unsigned char *) +
  466                                     sizeof(struct ip6_hdr);
  467                                 alloc = 0;
  468                         }
  469                 } else
  470                         break;
  471 
  472                 off = ip6.ip6_nxt & 0xff; /* Next header type. */
  473 
  474                 for (len = 0; len < skip - sizeof(struct ip6_hdr);)
  475                         switch (off) {
  476                         case IPPROTO_HOPOPTS:
  477                         case IPPROTO_DSTOPTS:
  478                                 ip6e = (struct ip6_ext *) (ptr + len);
  479 
  480                                 /*
  481                                  * Process the mutable/immutable
  482                                  * options -- borrows heavily from the
  483                                  * KAME code.
  484                                  */
  485                                 for (count = len + sizeof(struct ip6_ext);
  486                                      count < len + ((ip6e->ip6e_len + 1) << 3);) {
  487                                         if (ptr[count] == IP6OPT_PAD1) {
  488                                                 count++;
  489                                                 continue; /* Skip padding. */
  490                                         }
  491 
  492                                         /* Sanity check. */
  493                                         if (count > len +
  494                                             ((ip6e->ip6e_len + 1) << 3)) {
  495                                                 m_freem(m);
  496 
  497                                                 /* Free, if we allocated. */
  498                                                 if (alloc)
  499                                                         free(ptr, M_XDATA);
  500                                                 return EINVAL;
  501                                         }
  502 
  503                                         ad = ptr[count + 1];
  504 
  505                                         /* If mutable option, zeroize. */
  506                                         if (ptr[count] & IP6OPT_MUTABLE)
  507                                                 bcopy(ipseczeroes, ptr + count,
  508                                                     ptr[count + 1]);
  509 
  510                                         count += ad;
  511 
  512                                         /* Sanity check. */
  513                                         if (count >
  514                                             skip - sizeof(struct ip6_hdr)) {
  515                                                 m_freem(m);
  516 
  517                                                 /* Free, if we allocated. */
  518                                                 if (alloc)
  519                                                         free(ptr, M_XDATA);
  520                                                 return EINVAL;
  521                                         }
  522                                 }
  523 
  524                                 /* Advance. */
  525                                 len += ((ip6e->ip6e_len + 1) << 3);
  526                                 off = ip6e->ip6e_nxt;
  527                                 break;
  528 
  529                         case IPPROTO_ROUTING:
  530                                 /*
  531                                  * Always include routing headers in
  532                                  * computation.
  533                                  */
  534                                 ip6e = (struct ip6_ext *) (ptr + len);
  535                                 len += ((ip6e->ip6e_len + 1) << 3);
  536                                 off = ip6e->ip6e_nxt;
  537                                 break;
  538 
  539                         default:
  540                                 DPRINTF(("%s: unexpected IPv6 header type %d",
  541                                         __func__, off));
  542                                 if (alloc)
  543                                         free(ptr, M_XDATA);
  544                                 m_freem(m);
  545                                 return EINVAL;
  546                         }
  547 
  548                 /* Copyback and free, if we allocated. */
  549                 if (alloc) {
  550                         m_copyback(m, sizeof(struct ip6_hdr),
  551                             skip - sizeof(struct ip6_hdr), ptr);
  552                         free(ptr, M_XDATA);
  553                 }
  554 
  555                 break;
  556 #endif /* INET6 */
  557         }
  558 
  559         return 0;
  560 }
  561 
  562 /*
  563  * ah_input() gets called to verify that an input packet
  564  * passes authentication.
  565  */
  566 static int
  567 ah_input(struct mbuf *m, struct secasvar *sav, int skip, int protoff)
  568 {
  569         struct auth_hash *ahx;
  570         struct tdb_ident *tdbi;
  571         struct tdb_crypto *tc;
  572         struct m_tag *mtag;
  573         struct newah *ah;
  574         int hl, rplen, authsize;
  575 
  576         struct cryptodesc *crda;
  577         struct cryptop *crp;
  578 
  579         IPSEC_ASSERT(sav != NULL, ("null SA"));
  580         IPSEC_ASSERT(sav->key_auth != NULL, ("null authentication key"));
  581         IPSEC_ASSERT(sav->tdb_authalgxform != NULL,
  582                 ("null authentication xform"));
  583 
  584         /* Figure out header size. */
  585         rplen = HDRSIZE(sav);
  586 
  587         /* XXX don't pullup, just copy header */
  588         IP6_EXTHDR_GET(ah, struct newah *, m, skip, rplen);
  589         if (ah == NULL) {
  590                 DPRINTF(("ah_input: cannot pullup header\n"));
  591                 AHSTAT_INC(ahs_hdrops);         /*XXX*/
  592                 m_freem(m);
  593                 return ENOBUFS;
  594         }
  595 
  596         /* Check replay window, if applicable. */
  597         if (sav->replay && !ipsec_chkreplay(ntohl(ah->ah_seq), sav)) {
  598                 AHSTAT_INC(ahs_replay);
  599                 DPRINTF(("%s: packet replay failure: %s\n", __func__,
  600                           ipsec_logsastr(sav)));
  601                 m_freem(m);
  602                 return ENOBUFS;
  603         }
  604 
  605         /* Verify AH header length. */
  606         hl = ah->ah_len * sizeof (u_int32_t);
  607         ahx = sav->tdb_authalgxform;
  608         authsize = AUTHSIZE(sav);
  609         if (hl != authsize + rplen - sizeof (struct ah)) {
  610                 DPRINTF(("%s: bad authenticator length %u (expecting %lu)"
  611                         " for packet in SA %s/%08lx\n", __func__,
  612                         hl, (u_long) (authsize + rplen - sizeof (struct ah)),
  613                         ipsec_address(&sav->sah->saidx.dst),
  614                         (u_long) ntohl(sav->spi)));
  615                 AHSTAT_INC(ahs_badauthl);
  616                 m_freem(m);
  617                 return EACCES;
  618         }
  619         AHSTAT_ADD(ahs_ibytes, m->m_pkthdr.len - skip - hl);
  620 
  621         /* Get crypto descriptors. */
  622         crp = crypto_getreq(1);
  623         if (crp == NULL) {
  624                 DPRINTF(("%s: failed to acquire crypto descriptor\n",__func__));
  625                 AHSTAT_INC(ahs_crypto);
  626                 m_freem(m);
  627                 return ENOBUFS;
  628         }
  629 
  630         crda = crp->crp_desc;
  631         IPSEC_ASSERT(crda != NULL, ("null crypto descriptor"));
  632 
  633         crda->crd_skip = 0;
  634         crda->crd_len = m->m_pkthdr.len;
  635         crda->crd_inject = skip + rplen;
  636 
  637         /* Authentication operation. */
  638         crda->crd_alg = ahx->type;
  639         crda->crd_klen = _KEYBITS(sav->key_auth);
  640         crda->crd_key = sav->key_auth->key_data;
  641 
  642         /* Find out if we've already done crypto. */
  643         for (mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_CRYPTO_DONE, NULL);
  644              mtag != NULL;
  645              mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_CRYPTO_DONE, mtag)) {
  646                 tdbi = (struct tdb_ident *) (mtag + 1);
  647                 if (tdbi->proto == sav->sah->saidx.proto &&
  648                     tdbi->spi == sav->spi &&
  649                     !bcmp(&tdbi->dst, &sav->sah->saidx.dst,
  650                           sizeof (union sockaddr_union)))
  651                         break;
  652         }
  653 
  654         /* Allocate IPsec-specific opaque crypto info. */
  655         if (mtag == NULL) {
  656                 tc = (struct tdb_crypto *) malloc(sizeof (struct tdb_crypto) +
  657                         skip + rplen + authsize, M_XDATA, M_NOWAIT|M_ZERO);
  658         } else {
  659                 /* Hash verification has already been done successfully. */
  660                 tc = (struct tdb_crypto *) malloc(sizeof (struct tdb_crypto),
  661                                                     M_XDATA, M_NOWAIT|M_ZERO);
  662         }
  663         if (tc == NULL) {
  664                 DPRINTF(("%s: failed to allocate tdb_crypto\n", __func__));
  665                 AHSTAT_INC(ahs_crypto);
  666                 crypto_freereq(crp);
  667                 m_freem(m);
  668                 return ENOBUFS;
  669         }
  670 
  671         /* Only save information if crypto processing is needed. */
  672         if (mtag == NULL) {
  673                 int error;
  674 
  675                 /*
  676                  * Save the authenticator, the skipped portion of the packet,
  677                  * and the AH header.
  678                  */
  679                 m_copydata(m, 0, skip + rplen + authsize, (caddr_t)(tc+1));
  680 
  681                 /* Zeroize the authenticator on the packet. */
  682                 m_copyback(m, skip + rplen, authsize, ipseczeroes);
  683 
  684                 /* "Massage" the packet headers for crypto processing. */
  685                 error = ah_massage_headers(&m, sav->sah->saidx.dst.sa.sa_family,
  686                     skip, ahx->type, 0);
  687                 if (error != 0) {
  688                         /* NB: mbuf is free'd by ah_massage_headers */
  689                         AHSTAT_INC(ahs_hdrops);
  690                         free(tc, M_XDATA);
  691                         crypto_freereq(crp);
  692                         return error;
  693                 }
  694         }
  695 
  696         /* Crypto operation descriptor. */
  697         crp->crp_ilen = m->m_pkthdr.len; /* Total input length. */
  698         crp->crp_flags = CRYPTO_F_IMBUF | CRYPTO_F_CBIFSYNC;
  699         crp->crp_buf = (caddr_t) m;
  700         crp->crp_callback = ah_input_cb;
  701         crp->crp_sid = sav->tdb_cryptoid;
  702         crp->crp_opaque = (caddr_t) tc;
  703 
  704         /* These are passed as-is to the callback. */
  705         tc->tc_spi = sav->spi;
  706         tc->tc_dst = sav->sah->saidx.dst;
  707         tc->tc_proto = sav->sah->saidx.proto;
  708         tc->tc_nxt = ah->ah_nxt;
  709         tc->tc_protoff = protoff;
  710         tc->tc_skip = skip;
  711         tc->tc_ptr = (caddr_t) mtag; /* Save the mtag we've identified. */
  712         KEY_ADDREFSA(sav);
  713         tc->tc_sav = sav;
  714 
  715         if (mtag == NULL)
  716                 return crypto_dispatch(crp);
  717         else
  718                 return ah_input_cb(crp);
  719 }
  720 
  721 /*
  722  * AH input callback from the crypto driver.
  723  */
  724 static int
  725 ah_input_cb(struct cryptop *crp)
  726 {
  727         int rplen, error, skip, protoff;
  728         unsigned char calc[AH_ALEN_MAX];
  729         struct mbuf *m;
  730         struct cryptodesc *crd;
  731         struct auth_hash *ahx;
  732         struct tdb_crypto *tc;
  733         struct m_tag *mtag;
  734         struct secasvar *sav;
  735         struct secasindex *saidx;
  736         u_int8_t nxt;
  737         caddr_t ptr;
  738         int authsize;
  739 
  740         crd = crp->crp_desc;
  741 
  742         tc = (struct tdb_crypto *) crp->crp_opaque;
  743         IPSEC_ASSERT(tc != NULL, ("null opaque crypto data area!"));
  744         skip = tc->tc_skip;
  745         nxt = tc->tc_nxt;
  746         protoff = tc->tc_protoff;
  747         mtag = (struct m_tag *) tc->tc_ptr;
  748         m = (struct mbuf *) crp->crp_buf;
  749 
  750         sav = tc->tc_sav;
  751         IPSEC_ASSERT(sav != NULL, ("null SA!"));
  752 
  753         saidx = &sav->sah->saidx;
  754         IPSEC_ASSERT(saidx->dst.sa.sa_family == AF_INET ||
  755                 saidx->dst.sa.sa_family == AF_INET6,
  756                 ("unexpected protocol family %u", saidx->dst.sa.sa_family));
  757 
  758         ahx = (struct auth_hash *) sav->tdb_authalgxform;
  759 
  760         /* Check for crypto errors. */
  761         if (crp->crp_etype) {
  762                 if (sav->tdb_cryptoid != 0)
  763                         sav->tdb_cryptoid = crp->crp_sid;
  764 
  765                 if (crp->crp_etype == EAGAIN)
  766                         return (crypto_dispatch(crp));
  767 
  768                 AHSTAT_INC(ahs_noxform);
  769                 DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype));
  770                 error = crp->crp_etype;
  771                 goto bad;
  772         } else {
  773                 AHSTAT_INC(ahs_hist[sav->alg_auth]);
  774                 crypto_freereq(crp);            /* No longer needed. */
  775                 crp = NULL;
  776         }
  777 
  778         /* Shouldn't happen... */
  779         if (m == NULL) {
  780                 AHSTAT_INC(ahs_crypto);
  781                 DPRINTF(("%s: bogus returned buffer from crypto\n", __func__));
  782                 error = EINVAL;
  783                 goto bad;
  784         }
  785 
  786         /* Figure out header size. */
  787         rplen = HDRSIZE(sav);
  788         authsize = AUTHSIZE(sav);
  789 
  790         /* Copy authenticator off the packet. */
  791         m_copydata(m, skip + rplen, authsize, calc);
  792 
  793         /*
  794          * If we have an mtag, we don't need to verify the authenticator --
  795          * it has been verified by an IPsec-aware NIC.
  796          */
  797         if (mtag == NULL) {
  798                 ptr = (caddr_t) (tc + 1);
  799 
  800                 /* Verify authenticator. */
  801                 if (bcmp(ptr + skip + rplen, calc, authsize)) {
  802                         DPRINTF(("%s: authentication hash mismatch for packet "
  803                             "in SA %s/%08lx\n", __func__,
  804                             ipsec_address(&saidx->dst),
  805                             (u_long) ntohl(sav->spi)));
  806                         AHSTAT_INC(ahs_badauth);
  807                         error = EACCES;
  808                         goto bad;
  809                 }
  810 
  811                 /* Fix the Next Protocol field. */
  812                 ((u_int8_t *) ptr)[protoff] = nxt;
  813 
  814                 /* Copyback the saved (uncooked) network headers. */
  815                 m_copyback(m, 0, skip, ptr);
  816         } else {
  817                 /* Fix the Next Protocol field. */
  818                 m_copyback(m, protoff, sizeof(u_int8_t), &nxt);
  819         }
  820 
  821         free(tc, M_XDATA), tc = NULL;                   /* No longer needed */
  822 
  823         /*
  824          * Header is now authenticated.
  825          */
  826         m->m_flags |= M_AUTHIPHDR|M_AUTHIPDGM;
  827 
  828         /*
  829          * Update replay sequence number, if appropriate.
  830          */
  831         if (sav->replay) {
  832                 u_int32_t seq;
  833 
  834                 m_copydata(m, skip + offsetof(struct newah, ah_seq),
  835                            sizeof (seq), (caddr_t) &seq);
  836                 if (ipsec_updatereplay(ntohl(seq), sav)) {
  837                         AHSTAT_INC(ahs_replay);
  838                         error = ENOBUFS;                        /*XXX as above*/
  839                         goto bad;
  840                 }
  841         }
  842 
  843         /*
  844          * Remove the AH header and authenticator from the mbuf.
  845          */
  846         error = m_striphdr(m, skip, rplen + authsize);
  847         if (error) {
  848                 DPRINTF(("%s: mangled mbuf chain for SA %s/%08lx\n", __func__,
  849                     ipsec_address(&saidx->dst), (u_long) ntohl(sav->spi)));
  850 
  851                 AHSTAT_INC(ahs_hdrops);
  852                 goto bad;
  853         }
  854 
  855         switch (saidx->dst.sa.sa_family) {
  856 #ifdef INET6
  857         case AF_INET6:
  858                 error = ipsec6_common_input_cb(m, sav, skip, protoff, mtag);
  859                 break;
  860 #endif
  861 #ifdef INET
  862         case AF_INET:
  863                 error = ipsec4_common_input_cb(m, sav, skip, protoff, mtag);
  864                 break;
  865 #endif
  866         default:
  867                 panic("%s: Unexpected address family: %d saidx=%p", __func__,
  868                     saidx->dst.sa.sa_family, saidx);
  869         }
  870 
  871         KEY_FREESAV(&sav);
  872         return error;
  873 bad:
  874         if (sav)
  875                 KEY_FREESAV(&sav);
  876         if (m != NULL)
  877                 m_freem(m);
  878         if (tc != NULL)
  879                 free(tc, M_XDATA);
  880         if (crp != NULL)
  881                 crypto_freereq(crp);
  882         return error;
  883 }
  884 
  885 /*
  886  * AH output routine, called by ipsec[46]_process_packet().
  887  */
  888 static int
  889 ah_output(
  890         struct mbuf *m,
  891         struct ipsecrequest *isr,
  892         struct mbuf **mp,
  893         int skip,
  894         int protoff)
  895 {
  896         struct secasvar *sav;
  897         struct auth_hash *ahx;
  898         struct cryptodesc *crda;
  899         struct tdb_crypto *tc;
  900         struct mbuf *mi;
  901         struct cryptop *crp;
  902         u_int16_t iplen;
  903         int error, rplen, authsize, maxpacketsize, roff;
  904         u_int8_t prot;
  905         struct newah *ah;
  906 
  907         sav = isr->sav;
  908         IPSEC_ASSERT(sav != NULL, ("null SA"));
  909         ahx = sav->tdb_authalgxform;
  910         IPSEC_ASSERT(ahx != NULL, ("null authentication xform"));
  911 
  912         AHSTAT_INC(ahs_output);
  913 
  914         /* Figure out header size. */
  915         rplen = HDRSIZE(sav);
  916 
  917         /* Check for maximum packet size violations. */
  918         switch (sav->sah->saidx.dst.sa.sa_family) {
  919 #ifdef INET
  920         case AF_INET:
  921                 maxpacketsize = IP_MAXPACKET;
  922                 break;
  923 #endif /* INET */
  924 #ifdef INET6
  925         case AF_INET6:
  926                 maxpacketsize = IPV6_MAXPACKET;
  927                 break;
  928 #endif /* INET6 */
  929         default:
  930                 DPRINTF(("%s: unknown/unsupported protocol family %u, "
  931                     "SA %s/%08lx\n", __func__,
  932                     sav->sah->saidx.dst.sa.sa_family,
  933                     ipsec_address(&sav->sah->saidx.dst),
  934                     (u_long) ntohl(sav->spi)));
  935                 AHSTAT_INC(ahs_nopf);
  936                 error = EPFNOSUPPORT;
  937                 goto bad;
  938         }
  939         authsize = AUTHSIZE(sav);
  940         if (rplen + authsize + m->m_pkthdr.len > maxpacketsize) {
  941                 DPRINTF(("%s: packet in SA %s/%08lx got too big "
  942                     "(len %u, max len %u)\n", __func__,
  943                     ipsec_address(&sav->sah->saidx.dst),
  944                     (u_long) ntohl(sav->spi),
  945                     rplen + authsize + m->m_pkthdr.len, maxpacketsize));
  946                 AHSTAT_INC(ahs_toobig);
  947                 error = EMSGSIZE;
  948                 goto bad;
  949         }
  950 
  951         /* Update the counters. */
  952         AHSTAT_ADD(ahs_obytes, m->m_pkthdr.len - skip);
  953 
  954         m = m_unshare(m, M_NOWAIT);
  955         if (m == NULL) {
  956                 DPRINTF(("%s: cannot clone mbuf chain, SA %s/%08lx\n", __func__,
  957                     ipsec_address(&sav->sah->saidx.dst),
  958                     (u_long) ntohl(sav->spi)));
  959                 AHSTAT_INC(ahs_hdrops);
  960                 error = ENOBUFS;
  961                 goto bad;
  962         }
  963 
  964         /* Inject AH header. */
  965         mi = m_makespace(m, skip, rplen + authsize, &roff);
  966         if (mi == NULL) {
  967                 DPRINTF(("%s: failed to inject %u byte AH header for SA "
  968                     "%s/%08lx\n", __func__,
  969                     rplen + authsize,
  970                     ipsec_address(&sav->sah->saidx.dst),
  971                     (u_long) ntohl(sav->spi)));
  972                 AHSTAT_INC(ahs_hdrops);         /*XXX differs from openbsd */
  973                 error = ENOBUFS;
  974                 goto bad;
  975         }
  976 
  977         /*
  978          * The AH header is guaranteed by m_makespace() to be in
  979          * contiguous memory, at roff bytes offset into the returned mbuf.
  980          */
  981         ah = (struct newah *)(mtod(mi, caddr_t) + roff);
  982 
  983         /* Initialize the AH header. */
  984         m_copydata(m, protoff, sizeof(u_int8_t), (caddr_t) &ah->ah_nxt);
  985         ah->ah_len = (rplen + authsize - sizeof(struct ah)) / sizeof(u_int32_t);
  986         ah->ah_reserve = 0;
  987         ah->ah_spi = sav->spi;
  988 
  989         /* Zeroize authenticator. */
  990         m_copyback(m, skip + rplen, authsize, ipseczeroes);
  991 
  992         /* Insert packet replay counter, as requested.  */
  993         if (sav->replay) {
  994                 if (sav->replay->count == ~0 &&
  995                     (sav->flags & SADB_X_EXT_CYCSEQ) == 0) {
  996                         DPRINTF(("%s: replay counter wrapped for SA %s/%08lx\n",
  997                                 __func__,
  998                                 ipsec_address(&sav->sah->saidx.dst),
  999                                 (u_long) ntohl(sav->spi)));
 1000                         AHSTAT_INC(ahs_wrap);
 1001                         error = EINVAL;
 1002                         goto bad;
 1003                 }
 1004 #ifdef REGRESSION
 1005                 /* Emulate replay attack when ipsec_replay is TRUE. */
 1006                 if (!V_ipsec_replay)
 1007 #endif
 1008                         sav->replay->count++;
 1009                 ah->ah_seq = htonl(sav->replay->count);
 1010         }
 1011 
 1012         /* Get crypto descriptors. */
 1013         crp = crypto_getreq(1);
 1014         if (crp == NULL) {
 1015                 DPRINTF(("%s: failed to acquire crypto descriptors\n",
 1016                         __func__));
 1017                 AHSTAT_INC(ahs_crypto);
 1018                 error = ENOBUFS;
 1019                 goto bad;
 1020         }
 1021 
 1022         crda = crp->crp_desc;
 1023 
 1024         crda->crd_skip = 0;
 1025         crda->crd_inject = skip + rplen;
 1026         crda->crd_len = m->m_pkthdr.len;
 1027 
 1028         /* Authentication operation. */
 1029         crda->crd_alg = ahx->type;
 1030         crda->crd_key = sav->key_auth->key_data;
 1031         crda->crd_klen = _KEYBITS(sav->key_auth);
 1032 
 1033         /* Allocate IPsec-specific opaque crypto info. */
 1034         tc = (struct tdb_crypto *) malloc(
 1035                 sizeof(struct tdb_crypto) + skip, M_XDATA, M_NOWAIT|M_ZERO);
 1036         if (tc == NULL) {
 1037                 crypto_freereq(crp);
 1038                 DPRINTF(("%s: failed to allocate tdb_crypto\n", __func__));
 1039                 AHSTAT_INC(ahs_crypto);
 1040                 error = ENOBUFS;
 1041                 goto bad;
 1042         }
 1043 
 1044         /* Save the skipped portion of the packet. */
 1045         m_copydata(m, 0, skip, (caddr_t) (tc + 1));
 1046 
 1047         /*
 1048          * Fix IP header length on the header used for
 1049          * authentication. We don't need to fix the original
 1050          * header length as it will be fixed by our caller.
 1051          */
 1052         switch (sav->sah->saidx.dst.sa.sa_family) {
 1053 #ifdef INET
 1054         case AF_INET:
 1055                 bcopy(((caddr_t)(tc + 1)) +
 1056                     offsetof(struct ip, ip_len),
 1057                     (caddr_t) &iplen, sizeof(u_int16_t));
 1058                 iplen = htons(ntohs(iplen) + rplen + authsize);
 1059                 m_copyback(m, offsetof(struct ip, ip_len),
 1060                     sizeof(u_int16_t), (caddr_t) &iplen);
 1061                 break;
 1062 #endif /* INET */
 1063 
 1064 #ifdef INET6
 1065         case AF_INET6:
 1066                 bcopy(((caddr_t)(tc + 1)) +
 1067                     offsetof(struct ip6_hdr, ip6_plen),
 1068                     (caddr_t) &iplen, sizeof(u_int16_t));
 1069                 iplen = htons(ntohs(iplen) + rplen + authsize);
 1070                 m_copyback(m, offsetof(struct ip6_hdr, ip6_plen),
 1071                     sizeof(u_int16_t), (caddr_t) &iplen);
 1072                 break;
 1073 #endif /* INET6 */
 1074         }
 1075 
 1076         /* Fix the Next Header field in saved header. */
 1077         ((u_int8_t *) (tc + 1))[protoff] = IPPROTO_AH;
 1078 
 1079         /* Update the Next Protocol field in the IP header. */
 1080         prot = IPPROTO_AH;
 1081         m_copyback(m, protoff, sizeof(u_int8_t), (caddr_t) &prot);
 1082 
 1083         /* "Massage" the packet headers for crypto processing. */
 1084         error = ah_massage_headers(&m, sav->sah->saidx.dst.sa.sa_family,
 1085                         skip, ahx->type, 1);
 1086         if (error != 0) {
 1087                 m = NULL;       /* mbuf was free'd by ah_massage_headers. */
 1088                 free(tc, M_XDATA);
 1089                 crypto_freereq(crp);
 1090                 goto bad;
 1091         }
 1092 
 1093         /* Crypto operation descriptor. */
 1094         crp->crp_ilen = m->m_pkthdr.len; /* Total input length. */
 1095         crp->crp_flags = CRYPTO_F_IMBUF | CRYPTO_F_CBIFSYNC;
 1096         crp->crp_buf = (caddr_t) m;
 1097         crp->crp_callback = ah_output_cb;
 1098         crp->crp_sid = sav->tdb_cryptoid;
 1099         crp->crp_opaque = (caddr_t) tc;
 1100 
 1101         /* These are passed as-is to the callback. */
 1102         tc->tc_isr = isr;
 1103         KEY_ADDREFSA(sav);
 1104         tc->tc_sav = sav;
 1105         tc->tc_spi = sav->spi;
 1106         tc->tc_dst = sav->sah->saidx.dst;
 1107         tc->tc_proto = sav->sah->saidx.proto;
 1108         tc->tc_skip = skip;
 1109         tc->tc_protoff = protoff;
 1110 
 1111         return crypto_dispatch(crp);
 1112 bad:
 1113         if (m)
 1114                 m_freem(m);
 1115         return (error);
 1116 }
 1117 
 1118 /*
 1119  * AH output callback from the crypto driver.
 1120  */
 1121 static int
 1122 ah_output_cb(struct cryptop *crp)
 1123 {
 1124         int skip, protoff, error;
 1125         struct tdb_crypto *tc;
 1126         struct ipsecrequest *isr;
 1127         struct secasvar *sav;
 1128         struct mbuf *m;
 1129         caddr_t ptr;
 1130 
 1131         tc = (struct tdb_crypto *) crp->crp_opaque;
 1132         IPSEC_ASSERT(tc != NULL, ("null opaque data area!"));
 1133         skip = tc->tc_skip;
 1134         protoff = tc->tc_protoff;
 1135         ptr = (caddr_t) (tc + 1);
 1136         m = (struct mbuf *) crp->crp_buf;
 1137 
 1138         isr = tc->tc_isr;
 1139         IPSECREQUEST_LOCK(isr);
 1140         sav = tc->tc_sav;
 1141         /* With the isr lock released SA pointer can be updated. */
 1142         if (sav != isr->sav) {
 1143                 AHSTAT_INC(ahs_notdb);
 1144                 DPRINTF(("%s: SA expired while in crypto\n", __func__));
 1145                 error = ENOBUFS;                /*XXX*/
 1146                 goto bad;
 1147         }
 1148 
 1149         /* Check for crypto errors. */
 1150         if (crp->crp_etype) {
 1151                 if (sav->tdb_cryptoid != 0)
 1152                         sav->tdb_cryptoid = crp->crp_sid;
 1153 
 1154                 if (crp->crp_etype == EAGAIN) {
 1155                         IPSECREQUEST_UNLOCK(isr);
 1156                         return (crypto_dispatch(crp));
 1157                 }
 1158 
 1159                 AHSTAT_INC(ahs_noxform);
 1160                 DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype));
 1161                 error = crp->crp_etype;
 1162                 goto bad;
 1163         }
 1164 
 1165         /* Shouldn't happen... */
 1166         if (m == NULL) {
 1167                 AHSTAT_INC(ahs_crypto);
 1168                 DPRINTF(("%s: bogus returned buffer from crypto\n", __func__));
 1169                 error = EINVAL;
 1170                 goto bad;
 1171         }
 1172         AHSTAT_INC(ahs_hist[sav->alg_auth]);
 1173 
 1174         /*
 1175          * Copy original headers (with the new protocol number) back
 1176          * in place.
 1177          */
 1178         m_copyback(m, 0, skip, ptr);
 1179 
 1180         /* No longer needed. */
 1181         free(tc, M_XDATA);
 1182         crypto_freereq(crp);
 1183 
 1184 #ifdef REGRESSION
 1185         /* Emulate man-in-the-middle attack when ipsec_integrity is TRUE. */
 1186         if (V_ipsec_integrity) {
 1187                 int alen;
 1188 
 1189                 /*
 1190                  * Corrupt HMAC if we want to test integrity verification of
 1191                  * the other side.
 1192                  */
 1193                 alen = AUTHSIZE(sav);
 1194                 m_copyback(m, m->m_pkthdr.len - alen, alen, ipseczeroes);
 1195         }
 1196 #endif
 1197 
 1198         /* NB: m is reclaimed by ipsec_process_done. */
 1199         error = ipsec_process_done(m, isr);
 1200         KEY_FREESAV(&sav);
 1201         IPSECREQUEST_UNLOCK(isr);
 1202         return error;
 1203 bad:
 1204         if (sav)
 1205                 KEY_FREESAV(&sav);
 1206         IPSECREQUEST_UNLOCK(isr);
 1207         if (m)
 1208                 m_freem(m);
 1209         free(tc, M_XDATA);
 1210         crypto_freereq(crp);
 1211         return error;
 1212 }
 1213 
 1214 static struct xformsw ah_xformsw = {
 1215         XF_AH,          XFT_AUTH,       "IPsec AH",
 1216         ah_init,        ah_zeroize,     ah_input,       ah_output,
 1217 };
 1218 
 1219 static void
 1220 ah_attach(void)
 1221 {
 1222 
 1223         xform_register(&ah_xformsw);
 1224 }
 1225 
 1226 SYSINIT(ah_xform_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, ah_attach, NULL);

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