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sys/netipsec/xform_ah.c

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    1 /*      $NetBSD: xform_ah.c,v 1.8.2.1 2007/11/22 19:00:51 bouyer Exp $  */
    2 /*      $FreeBSD: src/sys/netipsec/xform_ah.c,v 1.1.4.1 2003/01/24 05:11:36 sam Exp $   */
    3 /*      $OpenBSD: ip_ah.c,v 1.63 2001/06/26 06:18:58 angelos Exp $ */
    4 /*
    5  * The authors of this code are John Ioannidis (ji@tla.org),
    6  * Angelos D. Keromytis (kermit@csd.uch.gr) and
    7  * Niels Provos (provos@physnet.uni-hamburg.de).
    8  *
    9  * The original version of this code was written by John Ioannidis
   10  * for BSD/OS in Athens, Greece, in November 1995.
   11  *
   12  * Ported to OpenBSD and NetBSD, with additional transforms, in December 1996,
   13  * by Angelos D. Keromytis.
   14  *
   15  * Additional transforms and features in 1997 and 1998 by Angelos D. Keromytis
   16  * and Niels Provos.
   17  *
   18  * Additional features in 1999 by Angelos D. Keromytis and Niklas Hallqvist.
   19  *
   20  * Copyright (c) 1995, 1996, 1997, 1998, 1999 by John Ioannidis,
   21  * Angelos D. Keromytis and Niels Provos.
   22  * Copyright (c) 1999 Niklas Hallqvist.
   23  * Copyright (c) 2001 Angelos D. Keromytis.
   24  *
   25  * Permission to use, copy, and modify this software with or without fee
   26  * is hereby granted, provided that this entire notice is included in
   27  * all copies of any software which is or includes a copy or
   28  * modification of this software.
   29  * You may use this code under the GNU public license if you so wish. Please
   30  * contribute changes back to the authors under this freer than GPL license
   31  * so that we may further the use of strong encryption without limitations to
   32  * all.
   33  *
   34  * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR
   35  * IMPLIED WARRANTY. IN PARTICULAR, NONE OF THE AUTHORS MAKES ANY
   36  * REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE
   37  * MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR
   38  * PURPOSE.
   39  */
   40 
   41 #include <sys/cdefs.h>
   42 __KERNEL_RCSID(0, "$NetBSD: xform_ah.c,v 1.8.2.1 2007/11/22 19:00:51 bouyer Exp $");
   43 
   44 #include "opt_inet.h"
   45 #ifdef __FreeBSD__
   46 #include "opt_inet6.h"
   47 #endif
   48 
   49 #include <sys/param.h>
   50 #include <sys/systm.h>
   51 #include <sys/mbuf.h>
   52 #include <sys/socket.h>
   53 #include <sys/syslog.h>
   54 #include <sys/kernel.h>
   55 #include <sys/sysctl.h>
   56 
   57 #include <net/if.h>
   58 
   59 #include <netinet/in.h>
   60 #include <netinet/in_systm.h>
   61 #include <netinet/ip.h>
   62 #include <netinet/ip_ecn.h>
   63 #include <netinet/ip6.h>
   64 
   65 #include <net/route.h>
   66 #include <netipsec/ipsec.h>
   67 #include <netipsec/ah.h>
   68 #include <netipsec/ah_var.h>
   69 #include <netipsec/xform.h>
   70 
   71 #ifdef INET6
   72 #include <netinet6/ip6_var.h>
   73 #include <netipsec/ipsec6.h>
   74 #  ifdef __FreeBSD__
   75 #  include <netinet6/ip6_ecn.h>
   76 #  endif
   77 #endif
   78 
   79 #include <netipsec/key.h>
   80 #include <netipsec/key_debug.h>
   81 #include <netipsec/ipsec_osdep.h>
   82 
   83 #include <opencrypto/cryptodev.h>
   84 
   85 /*
   86  * Return header size in bytes.  The old protocol did not support
   87  * the replay counter; the new protocol always includes the counter.
   88  */
   89 #define HDRSIZE(sav) \
   90         (((sav)->flags & SADB_X_EXT_OLD) ? \
   91                 sizeof (struct ah) : sizeof (struct ah) + sizeof (u_int32_t))
   92 /*
   93  * Return authenticator size in bytes.  The old protocol is known
   94  * to use a fixed 16-byte authenticator.  The new algorithm gets
   95  * this size from the xform but is (currently) always 12.
   96  */
   97 #define AUTHSIZE(sav) \
   98         ((sav->flags & SADB_X_EXT_OLD) ? 16 : (sav)->tdb_authalgxform->authsize)
   99 
  100 int     ah_enable = 1;                  /* control flow of packets with AH */
  101 int     ah_cleartos = 1;                /* clear ip_tos when doing AH calc */
  102 struct  ahstat ahstat;
  103 
  104 #ifdef __FreeBSD__
  105 SYSCTL_DECL(_net_inet_ah);
  106 SYSCTL_INT(_net_inet_ah, OID_AUTO,
  107         ah_enable,      CTLFLAG_RW,     &ah_enable,     0, "");
  108 SYSCTL_INT(_net_inet_ah, OID_AUTO,
  109         ah_cleartos,    CTLFLAG_RW,     &ah_cleartos,   0, "");
  110 SYSCTL_STRUCT(_net_inet_ah, IPSECCTL_STATS,
  111         stats,          CTLFLAG_RD,     &ahstat,        ahstat, "");
  112 
  113 #endif /* __FreeBSD__ */
  114 
  115 static unsigned char ipseczeroes[256];  /* larger than an ip6 extension hdr */
  116 
  117 static int ah_input_cb(struct cryptop*);
  118 static int ah_output_cb(struct cryptop*);
  119 
  120 /*
  121  * NB: this is public for use by the PF_KEY support.
  122  */
  123 struct auth_hash *
  124 ah_algorithm_lookup(int alg)
  125 {
  126         if (alg >= AH_ALG_MAX)
  127                 return NULL;
  128         switch (alg) {
  129         case SADB_X_AALG_NULL:
  130                 return &auth_hash_null;
  131         case SADB_AALG_MD5HMAC:
  132                 return &auth_hash_hmac_md5_96;
  133         case SADB_AALG_SHA1HMAC:
  134                 return &auth_hash_hmac_sha1_96;
  135         case SADB_X_AALG_RIPEMD160HMAC:
  136                 return &auth_hash_hmac_ripemd_160_96;
  137         case SADB_X_AALG_MD5:
  138                 return &auth_hash_key_md5;
  139         case SADB_X_AALG_SHA:
  140                 return &auth_hash_key_sha1;
  141         case SADB_X_AALG_SHA2_256:
  142                 return &auth_hash_hmac_sha2_256;
  143         case SADB_X_AALG_SHA2_384:
  144                 return &auth_hash_hmac_sha2_384;
  145         case SADB_X_AALG_SHA2_512:
  146                 return &auth_hash_hmac_sha2_512;
  147         }
  148         return NULL;
  149 }
  150 
  151 size_t
  152 ah_hdrsiz(struct secasvar *sav)
  153 {
  154         size_t size;
  155 
  156         if (sav != NULL) {
  157                 int authsize;
  158                 IPSEC_ASSERT(sav->tdb_authalgxform != NULL,
  159                         ("ah_hdrsiz: null xform"));
  160                 /*XXX not right for null algorithm--does it matter??*/
  161                 authsize = AUTHSIZE(sav);
  162                 size = roundup(authsize, sizeof (u_int32_t)) + HDRSIZE(sav);
  163         } else {
  164                 /* default guess */
  165                 size = sizeof (struct ah) + sizeof (u_int32_t) + 16;
  166         }
  167         return size;
  168 }
  169 
  170 /*
  171  * NB: public for use by esp_init.
  172  */
  173 int
  174 ah_init0(struct secasvar *sav, struct xformsw *xsp, struct cryptoini *cria)
  175 {
  176         struct auth_hash *thash;
  177         int keylen;
  178 
  179         thash = ah_algorithm_lookup(sav->alg_auth);
  180         if (thash == NULL) {
  181                 DPRINTF(("ah_init: unsupported authentication algorithm %u\n",
  182                         sav->alg_auth));
  183                 return EINVAL;
  184         }
  185         /*
  186          * Verify the replay state block allocation is consistent with
  187          * the protocol type.  We check here so we can make assumptions
  188          * later during protocol processing.
  189          */
  190         /* NB: replay state is setup elsewhere (sigh) */
  191         if (((sav->flags&SADB_X_EXT_OLD) == 0) ^ (sav->replay != NULL)) {
  192                 DPRINTF(("ah_init: replay state block inconsistency, "
  193                         "%s algorithm %s replay state\n",
  194                         (sav->flags & SADB_X_EXT_OLD) ? "old" : "new",
  195                         sav->replay == NULL ? "without" : "with"));
  196                 return EINVAL;
  197         }
  198         if (sav->key_auth == NULL) {
  199                 DPRINTF(("ah_init: no authentication key for %s "
  200                         "algorithm\n", thash->name));
  201                 return EINVAL;
  202         }
  203         keylen = _KEYLEN(sav->key_auth);
  204         if (keylen != thash->keysize && thash->keysize != 0) {
  205                 DPRINTF(("ah_init: invalid keylength %d, algorithm "
  206                          "%s requires keysize %d\n",
  207                          keylen, thash->name, thash->keysize));
  208                 return EINVAL;
  209         }
  210 
  211         sav->tdb_xform = xsp;
  212         sav->tdb_authalgxform = thash;
  213 
  214         /* Initialize crypto session. */
  215         bzero(cria, sizeof (*cria));
  216         cria->cri_alg = sav->tdb_authalgxform->type;
  217         cria->cri_klen = _KEYBITS(sav->key_auth);
  218         cria->cri_key = _KEYBUF(sav->key_auth);
  219 
  220         return 0;
  221 }
  222 
  223 /*
  224  * ah_init() is called when an SPI is being set up.
  225  */
  226 static int
  227 ah_init(struct secasvar *sav, struct xformsw *xsp)
  228 {
  229         struct cryptoini cria;
  230         int error;
  231 
  232         error = ah_init0(sav, xsp, &cria);
  233         return error ? error :
  234                  crypto_newsession(&sav->tdb_cryptoid, &cria, crypto_support);
  235 }
  236 
  237 /*
  238  * Paranoia.
  239  *
  240  * NB: public for use by esp_zeroize (XXX).
  241  */
  242 int
  243 ah_zeroize(struct secasvar *sav)
  244 {
  245         int err;
  246 
  247         if (sav->key_auth)
  248                 bzero(_KEYBUF(sav->key_auth), _KEYLEN(sav->key_auth));
  249 
  250         err = crypto_freesession(sav->tdb_cryptoid);
  251         sav->tdb_cryptoid = 0;
  252         sav->tdb_authalgxform = NULL;
  253         sav->tdb_xform = NULL;
  254         return err;
  255 }
  256 
  257 /*
  258  * Massage IPv4/IPv6 headers for AH processing.
  259  */
  260 static int
  261 ah_massage_headers(struct mbuf **m0, int proto, int skip, int alg, int out)
  262 {
  263         struct mbuf *m = *m0;
  264         unsigned char *ptr;
  265         int off, count;
  266 
  267 #ifdef INET
  268         struct ip *ip;
  269 #endif /* INET */
  270 
  271 #ifdef INET6
  272         struct ip6_ext *ip6e;
  273         struct ip6_hdr ip6;
  274         int alloc, len, ad;
  275 #endif /* INET6 */
  276 
  277         switch (proto) {
  278 #ifdef INET
  279         case AF_INET:
  280                 /*
  281                  * This is the least painful way of dealing with IPv4 header
  282                  * and option processing -- just make sure they're in
  283                  * contiguous memory.
  284                  */
  285                 *m0 = m = m_pullup(m, skip);
  286                 if (m == NULL) {
  287                         DPRINTF(("ah_massage_headers: m_pullup failed\n"));
  288                         return ENOBUFS;
  289                 }
  290 
  291                 /* Fix the IP header */
  292                 ip = mtod(m, struct ip *);
  293                 if (ah_cleartos)
  294                         ip->ip_tos = 0;
  295                 ip->ip_ttl = 0;
  296                 ip->ip_sum = 0;
  297 
  298                 /*
  299                  * On FreeBSD, ip_off and ip_len assumed in host endian;
  300                  * they are converted (if necessary) by ip_input().
  301                  * On NetBSD, ip_off and ip_len are in network byte order.
  302                  * They must be massaged back to network byte order
  303                  * before verifying the  HMAC. Moreover, on FreeBSD,
  304                  * we should add `skip' back into the massaged ip_len
  305                  * (presumably ip_input() deducted it before we got here?)
  306                  * whereas on NetBSD, we should not.
  307                  */
  308 #ifdef __FreeBSD__
  309   #define TOHOST(x) (x)
  310 #else
  311   #define TOHOST(x) (ntohs(x))
  312 #endif
  313                 if (!out) {
  314                         u_int16_t inlen = TOHOST(ip->ip_len);
  315 
  316 #ifdef __FreeBSD__
  317                         ip->ip_len = htons(inlen + skip);
  318 #else  /*!__FreeBSD__ */
  319                         ip->ip_len = htons(inlen);
  320 #endif /*!__FreeBSD__ */
  321                         DPRINTF(("ip len: skip %d, "
  322                                  "in %d host %d: new: raw %d host %d\n",
  323                                  skip,
  324                                  inlen, TOHOST(inlen),
  325                                  ip->ip_len, ntohs(ip->ip_len)));
  326 
  327 
  328                         if (alg == CRYPTO_MD5_KPDK || alg == CRYPTO_SHA1_KPDK)
  329                                 ip->ip_off  &= IP_OFF_CONVERT(IP_DF);
  330                         else
  331                                 ip->ip_off = 0;
  332                 } else {
  333                         if (alg == CRYPTO_MD5_KPDK || alg == CRYPTO_SHA1_KPDK)
  334                                 ip->ip_off &= IP_OFF_CONVERT(IP_DF);
  335                         else
  336                                 ip->ip_off = 0;
  337                 }
  338 
  339                 ptr = mtod(m, unsigned char *) + sizeof(struct ip);
  340 
  341                 /* IPv4 option processing */
  342                 for (off = sizeof(struct ip); off < skip;) {
  343                         if (ptr[off] == IPOPT_EOL || ptr[off] == IPOPT_NOP ||
  344                             off + 1 < skip)
  345                                 ;
  346                         else {
  347                                 DPRINTF(("ah_massage_headers: illegal IPv4 "
  348                                     "option length for option %d\n",
  349                                     ptr[off]));
  350 
  351                                 m_freem(m);
  352                                 return EINVAL;
  353                         }
  354 
  355                         switch (ptr[off]) {
  356                         case IPOPT_EOL:
  357                                 off = skip;  /* End the loop. */
  358                                 break;
  359 
  360                         case IPOPT_NOP:
  361                                 off++;
  362                                 break;
  363 
  364                         case IPOPT_SECURITY:    /* 0x82 */
  365                         case 0x85:      /* Extended security. */
  366                         case 0x86:      /* Commercial security. */
  367                         case 0x94:      /* Router alert */
  368                         case 0x95:      /* RFC1770 */
  369                                 /* Sanity check for option length. */
  370                                 if (ptr[off + 1] < 2) {
  371                                         DPRINTF(("ah_massage_headers: "
  372                                             "illegal IPv4 option length for "
  373                                             "option %d\n", ptr[off]));
  374 
  375                                         m_freem(m);
  376                                         return EINVAL;
  377                                 }
  378 
  379                                 off += ptr[off + 1];
  380                                 break;
  381 
  382                         case IPOPT_LSRR:
  383                         case IPOPT_SSRR:
  384                                 /* Sanity check for option length. */
  385                                 if (ptr[off + 1] < 2) {
  386                                         DPRINTF(("ah_massage_headers: "
  387                                             "illegal IPv4 option length for "
  388                                             "option %d\n", ptr[off]));
  389 
  390                                         m_freem(m);
  391                                         return EINVAL;
  392                                 }
  393 
  394                                 /*
  395                                  * On output, if we have either of the
  396                                  * source routing options, we should
  397                                  * swap the destination address of the
  398                                  * IP header with the last address
  399                                  * specified in the option, as that is
  400                                  * what the destination's IP header
  401                                  * will look like.
  402                                  */
  403                                 if (out)
  404                                         bcopy(ptr + off + ptr[off + 1] -
  405                                             sizeof(struct in_addr),
  406                                             &(ip->ip_dst), sizeof(struct in_addr));
  407 
  408                                 /* Fall through */
  409                         default:
  410                                 /* Sanity check for option length. */
  411                                 if (ptr[off + 1] < 2) {
  412                                         DPRINTF(("ah_massage_headers: "
  413                                             "illegal IPv4 option length for "
  414                                             "option %d\n", ptr[off]));
  415                                         m_freem(m);
  416                                         return EINVAL;
  417                                 }
  418 
  419                                 /* Zeroize all other options. */
  420                                 count = ptr[off + 1];
  421                                 bcopy(ipseczeroes, ptr, count);
  422                                 off += count;
  423                                 break;
  424                         }
  425 
  426                         /* Sanity check. */
  427                         if (off > skip) {
  428                                 DPRINTF(("ah_massage_headers(): malformed "
  429                                     "IPv4 options header\n"));
  430 
  431                                 m_freem(m);
  432                                 return EINVAL;
  433                         }
  434                 }
  435 
  436                 break;
  437 #endif /* INET */
  438 
  439 #ifdef INET6
  440         case AF_INET6:  /* Ugly... */
  441                 /* Copy and "cook" the IPv6 header. */
  442                 m_copydata(m, 0, sizeof(ip6), (caddr_t) &ip6);
  443 
  444                 /* We don't do IPv6 Jumbograms. */
  445                 if (ip6.ip6_plen == 0) {
  446                         DPRINTF(("ah_massage_headers: unsupported IPv6 jumbogram\n"));
  447                         m_freem(m);
  448                         return EMSGSIZE;
  449                 }
  450 
  451                 ip6.ip6_flow = 0;
  452                 ip6.ip6_hlim = 0;
  453                 ip6.ip6_vfc &= ~IPV6_VERSION_MASK;
  454                 ip6.ip6_vfc |= IPV6_VERSION;
  455 
  456                 /* Scoped address handling. */
  457                 if (IN6_IS_SCOPE_LINKLOCAL(&ip6.ip6_src))
  458                         ip6.ip6_src.s6_addr16[1] = 0;
  459                 if (IN6_IS_SCOPE_LINKLOCAL(&ip6.ip6_dst))
  460                         ip6.ip6_dst.s6_addr16[1] = 0;
  461 
  462                 /* Done with IPv6 header. */
  463                 m_copyback(m, 0, sizeof(struct ip6_hdr), (caddr_t) &ip6);
  464 
  465                 /* Let's deal with the remaining headers (if any). */
  466                 if (skip - sizeof(struct ip6_hdr) > 0) {
  467                         if (m->m_len <= skip) {
  468                                 ptr = (unsigned char *) malloc(
  469                                     skip - sizeof(struct ip6_hdr),
  470                                     M_XDATA, M_NOWAIT);
  471                                 if (ptr == NULL) {
  472                                         DPRINTF(("ah_massage_headers: failed "
  473                                             "to allocate memory for IPv6 "
  474                                             "headers\n"));
  475                                         m_freem(m);
  476                                         return ENOBUFS;
  477                                 }
  478 
  479                                 /*
  480                                  * Copy all the protocol headers after
  481                                  * the IPv6 header.
  482                                  */
  483                                 m_copydata(m, sizeof(struct ip6_hdr),
  484                                     skip - sizeof(struct ip6_hdr), ptr);
  485                                 alloc = 1;
  486                         } else {
  487                                 /* No need to allocate memory. */
  488                                 ptr = mtod(m, unsigned char *) +
  489                                     sizeof(struct ip6_hdr);
  490                                 alloc = 0;
  491                         }
  492                 } else
  493                         break;
  494 
  495                 off = ip6.ip6_nxt & 0xff; /* Next header type. */
  496 
  497                 for (len = 0; len < skip - sizeof(struct ip6_hdr);)
  498                         switch (off) {
  499                         case IPPROTO_HOPOPTS:
  500                         case IPPROTO_DSTOPTS:
  501                                 ip6e = (struct ip6_ext *) (ptr + len);
  502 
  503                                 /*
  504                                  * Process the mutable/immutable
  505                                  * options -- borrows heavily from the
  506                                  * KAME code.
  507                                  */
  508                                 for (count = len + sizeof(struct ip6_ext);
  509                                      count < len + ((ip6e->ip6e_len + 1) << 3);) {
  510                                         if (ptr[count] == IP6OPT_PAD1) {
  511                                                 count++;
  512                                                 continue; /* Skip padding. */
  513                                         }
  514 
  515                                         /* Sanity check. */
  516                                         if (count > len +
  517                                             ((ip6e->ip6e_len + 1) << 3)) {
  518                                                 m_freem(m);
  519 
  520                                                 /* Free, if we allocated. */
  521                                                 if (alloc)
  522                                                         FREE(ptr, M_XDATA);
  523                                                 return EINVAL;
  524                                         }
  525 
  526                                         ad = ptr[count + 1];
  527 
  528                                         /* If mutable option, zeroize. */
  529                                         if (ptr[count] & IP6OPT_MUTABLE)
  530                                                 bcopy(ipseczeroes, ptr + count,
  531                                                     ptr[count + 1]);
  532 
  533                                         count += ad;
  534 
  535                                         /* Sanity check. */
  536                                         if (count >
  537                                             skip - sizeof(struct ip6_hdr)) {
  538                                                 m_freem(m);
  539 
  540                                                 /* Free, if we allocated. */
  541                                                 if (alloc)
  542                                                         FREE(ptr, M_XDATA);
  543                                                 return EINVAL;
  544                                         }
  545                                 }
  546 
  547                                 /* Advance. */
  548                                 len += ((ip6e->ip6e_len + 1) << 3);
  549                                 off = ip6e->ip6e_nxt;
  550                                 break;
  551 
  552                         case IPPROTO_ROUTING:
  553                                 /*
  554                                  * Always include routing headers in
  555                                  * computation.
  556                                  */
  557                                 ip6e = (struct ip6_ext *) (ptr + len);
  558                                 len += ((ip6e->ip6e_len + 1) << 3);
  559                                 off = ip6e->ip6e_nxt;
  560                                 break;
  561 
  562                         default:
  563                                 DPRINTF(("ah_massage_headers: unexpected "
  564                                     "IPv6 header type %d", off));
  565                                 if (alloc)
  566                                         FREE(ptr, M_XDATA);
  567                                 m_freem(m);
  568                                 return EINVAL;
  569                         }
  570 
  571                 /* Copyback and free, if we allocated. */
  572                 if (alloc) {
  573                         m_copyback(m, sizeof(struct ip6_hdr),
  574                             skip - sizeof(struct ip6_hdr), ptr);
  575                         free(ptr, M_XDATA);
  576                 }
  577 
  578                 break;
  579 #endif /* INET6 */
  580         }
  581 
  582         return 0;
  583 }
  584 
  585 /*
  586  * ah_input() gets called to verify that an input packet
  587  * passes authentication.
  588  */
  589 static int
  590 ah_input(struct mbuf *m, struct secasvar *sav, int skip, int protoff)
  591 {
  592         struct auth_hash *ahx;
  593         struct tdb_ident *tdbi;
  594         struct tdb_crypto *tc;
  595         struct m_tag *mtag;
  596         struct newah *ah;
  597         int hl, rplen, authsize;
  598 
  599         struct cryptodesc *crda;
  600         struct cryptop *crp;
  601 
  602         IPSEC_SPLASSERT_SOFTNET("ah_input");
  603 
  604         IPSEC_ASSERT(sav != NULL, ("ah_input: null SA"));
  605         IPSEC_ASSERT(sav->key_auth != NULL,
  606                 ("ah_input: null authentication key"));
  607         IPSEC_ASSERT(sav->tdb_authalgxform != NULL,
  608                 ("ah_input: null authentication xform"));
  609 
  610         /* Figure out header size. */
  611         rplen = HDRSIZE(sav);
  612 
  613         /* XXX don't pullup, just copy header */
  614         IP6_EXTHDR_GET(ah, struct newah *, m, skip, rplen);
  615         if (ah == NULL) {
  616                 DPRINTF(("ah_input: cannot pullup header\n"));
  617                 ahstat.ahs_hdrops++;            /*XXX*/
  618                 m_freem(m);
  619                 return ENOBUFS;
  620         }
  621 
  622         /* Check replay window, if applicable. */
  623         if (sav->replay && !ipsec_chkreplay(ntohl(ah->ah_seq), sav)) {
  624                 ahstat.ahs_replay++;
  625                 DPRINTF(("ah_input: packet replay failure: %s\n",
  626                           ipsec_logsastr(sav)));
  627                 m_freem(m);
  628                 return ENOBUFS;
  629         }
  630 
  631         /* Verify AH header length. */
  632         hl = ah->ah_len * sizeof (u_int32_t);
  633         ahx = sav->tdb_authalgxform;
  634         authsize = AUTHSIZE(sav);
  635         if (hl != authsize + rplen - sizeof (struct ah)) {
  636                 DPRINTF(("ah_input: bad authenticator length %u (expecting %lu)"
  637                         " for packet in SA %s/%08lx\n",
  638                         hl, (u_long) (authsize + rplen - sizeof (struct ah)),
  639                         ipsec_address(&sav->sah->saidx.dst),
  640                         (u_long) ntohl(sav->spi)));
  641                 ahstat.ahs_badauthl++;
  642                 m_freem(m);
  643                 return EACCES;
  644         }
  645         ahstat.ahs_ibytes += m->m_pkthdr.len - skip - hl;
  646         DPRINTF(("ah_input skip %d poff %d\n"
  647                  "len: hl %d authsize %d rpl %d expect %ld\n",
  648                  skip, protoff,
  649                  hl, authsize, rplen,
  650                  (long)(authsize + rplen - sizeof(struct ah))));
  651 
  652         /* Get crypto descriptors. */
  653         crp = crypto_getreq(1);
  654         if (crp == NULL) {
  655                 DPRINTF(("ah_input: failed to acquire crypto descriptor\n"));
  656                 ahstat.ahs_crypto++;
  657                 m_freem(m);
  658                 return ENOBUFS;
  659         }
  660 
  661         crda = crp->crp_desc;
  662         IPSEC_ASSERT(crda != NULL, ("ah_input: null crypto descriptor"));
  663 
  664         crda->crd_skip = 0;
  665         crda->crd_len = m->m_pkthdr.len;
  666         crda->crd_inject = skip + rplen;
  667 
  668         /* Authentication operation. */
  669         crda->crd_alg = ahx->type;
  670         crda->crd_key = _KEYBUF(sav->key_auth);
  671         crda->crd_klen = _KEYBITS(sav->key_auth);
  672 
  673         /* Find out if we've already done crypto. */
  674         for (mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_CRYPTO_DONE, NULL);
  675              mtag != NULL;
  676              mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_CRYPTO_DONE, mtag)) {
  677                 tdbi = (struct tdb_ident *) (mtag + 1);
  678                 if (tdbi->proto == sav->sah->saidx.proto &&
  679                     tdbi->spi == sav->spi &&
  680                     !bcmp(&tdbi->dst, &sav->sah->saidx.dst,
  681                           sizeof (union sockaddr_union)))
  682                         break;
  683         }
  684 
  685         /* Allocate IPsec-specific opaque crypto info. */
  686         if (mtag == NULL) {
  687                 tc = (struct tdb_crypto *) malloc(sizeof (struct tdb_crypto) +
  688                         skip + rplen + authsize, M_XDATA, M_NOWAIT|M_ZERO);
  689         } else {
  690                 /* Hash verification has already been done successfully. */
  691                 tc = (struct tdb_crypto *) malloc(sizeof (struct tdb_crypto),
  692                                                     M_XDATA, M_NOWAIT|M_ZERO);
  693         }
  694         if (tc == NULL) {
  695                 DPRINTF(("ah_input: failed to allocate tdb_crypto\n"));
  696                 ahstat.ahs_crypto++;
  697                 crypto_freereq(crp);
  698                 m_freem(m);
  699                 return ENOBUFS;
  700         }
  701 
  702         /* Only save information if crypto processing is needed. */
  703         if (mtag == NULL) {
  704                 int error;
  705 
  706                 /*
  707                  * Save the authenticator, the skipped portion of the packet,
  708                  * and the AH header.
  709                  */
  710                 m_copydata(m, 0, skip + rplen + authsize, (caddr_t)(tc+1));
  711 
  712                 {
  713                         u_int8_t *pppp = ((caddr_t)(tc+1))+skip+rplen;
  714                         DPRINTF(("ah_input: zeroing %d bytes of authent " \
  715                     "%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x\n",
  716                                  authsize,
  717                                  pppp[0], pppp[1], pppp[2], pppp[3],
  718                                  pppp[4], pppp[5], pppp[6], pppp[7],
  719                                  pppp[8], pppp[9], pppp[10], pppp[11]));
  720                 }
  721 
  722                 /* Zeroize the authenticator on the packet. */
  723                 m_copyback(m, skip + rplen, authsize, ipseczeroes);
  724 
  725                 /* "Massage" the packet headers for crypto processing. */
  726                 error = ah_massage_headers(&m, sav->sah->saidx.dst.sa.sa_family,
  727                     skip, ahx->type, 0);
  728                 if (error != 0) {
  729                         /* NB: mbuf is free'd by ah_massage_headers */
  730                         ahstat.ahs_hdrops++;
  731                         free(tc, M_XDATA);
  732                         crypto_freereq(crp);
  733                         return error;
  734                 }
  735         }
  736 
  737         /* Crypto operation descriptor. */
  738         crp->crp_ilen = m->m_pkthdr.len; /* Total input length. */
  739         crp->crp_flags = CRYPTO_F_IMBUF;
  740         crp->crp_buf = (caddr_t) m;
  741         crp->crp_callback = ah_input_cb;
  742         crp->crp_sid = sav->tdb_cryptoid;
  743         crp->crp_opaque = (caddr_t) tc;
  744 
  745         /* These are passed as-is to the callback. */
  746         tc->tc_spi = sav->spi;
  747         tc->tc_dst = sav->sah->saidx.dst;
  748         tc->tc_proto = sav->sah->saidx.proto;
  749         tc->tc_nxt = ah->ah_nxt;
  750         tc->tc_protoff = protoff;
  751         tc->tc_skip = skip;
  752         tc->tc_ptr = (caddr_t) mtag; /* Save the mtag we've identified. */
  753 
  754         DPRINTF(("ah: hash over %d bytes, skip %d: "
  755                  "crda len %d skip %d inject %d\n",
  756                  crp->crp_ilen, tc->tc_skip,
  757                  crda->crd_len, crda->crd_skip, crda->crd_inject));
  758 
  759         if (mtag == NULL)
  760                 return crypto_dispatch(crp);
  761         else
  762                 return ah_input_cb(crp);
  763 }
  764 
  765 #ifdef INET6
  766 #define IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, mtag) do {              \
  767         if (saidx->dst.sa.sa_family == AF_INET6) {                           \
  768                 error = ipsec6_common_input_cb(m, sav, skip, protoff, mtag); \
  769         } else {                                                             \
  770                 error = ipsec4_common_input_cb(m, sav, skip, protoff, mtag); \
  771         }                                                                    \
  772 } while (0)
  773 #else
  774 #define IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, mtag)                   \
  775         (error = ipsec4_common_input_cb(m, sav, skip, protoff, mtag))
  776 #endif
  777 
  778 /*
  779  * AH input callback from the crypto driver.
  780  */
  781 static int
  782 ah_input_cb(struct cryptop *crp)
  783 {
  784         int rplen, error, skip, protoff;
  785         unsigned char calc[AH_ALEN_MAX];
  786         struct mbuf *m;
  787         struct cryptodesc *crd;
  788         struct auth_hash *ahx;
  789         struct tdb_crypto *tc;
  790         struct m_tag *mtag;
  791         struct secasvar *sav;
  792         struct secasindex *saidx;
  793         u_int8_t nxt;
  794         caddr_t ptr;
  795         int s, authsize;
  796 
  797         crd = crp->crp_desc;
  798 
  799         tc = (struct tdb_crypto *) crp->crp_opaque;
  800         IPSEC_ASSERT(tc != NULL, ("ah_input_cb: null opaque crypto data area!"));
  801         skip = tc->tc_skip;
  802         nxt = tc->tc_nxt;
  803         protoff = tc->tc_protoff;
  804         mtag = (struct m_tag *) tc->tc_ptr;
  805         m = (struct mbuf *) crp->crp_buf;
  806 
  807         s = splsoftnet();
  808 
  809         sav = KEY_ALLOCSA(&tc->tc_dst, tc->tc_proto, tc->tc_spi);
  810         if (sav == NULL) {
  811                 ahstat.ahs_notdb++;
  812                 DPRINTF(("ah_input_cb: SA expired while in crypto\n"));
  813                 error = ENOBUFS;                /*XXX*/
  814                 goto bad;
  815         }
  816 
  817         saidx = &sav->sah->saidx;
  818         IPSEC_ASSERT(saidx->dst.sa.sa_family == AF_INET ||
  819                 saidx->dst.sa.sa_family == AF_INET6,
  820                 ("ah_input_cb: unexpected protocol family %u",
  821                  saidx->dst.sa.sa_family));
  822 
  823         ahx = (struct auth_hash *) sav->tdb_authalgxform;
  824 
  825         /* Check for crypto errors. */
  826         if (crp->crp_etype) {
  827                 if (sav->tdb_cryptoid != 0)
  828                         sav->tdb_cryptoid = crp->crp_sid;
  829 
  830                 if (crp->crp_etype == EAGAIN)
  831                         return crypto_dispatch(crp);
  832 
  833                 ahstat.ahs_noxform++;
  834                 DPRINTF(("ah_input_cb: crypto error %d\n", crp->crp_etype));
  835                 error = crp->crp_etype;
  836                 goto bad;
  837         } else {
  838                 ahstat.ahs_hist[sav->alg_auth]++;
  839                 crypto_freereq(crp);            /* No longer needed. */
  840                 crp = NULL;
  841         }
  842 
  843         /* Shouldn't happen... */
  844         if (m == NULL) {
  845                 ahstat.ahs_crypto++;
  846                 DPRINTF(("ah_input_cb: bogus returned buffer from crypto\n"));
  847                 error = EINVAL;
  848                 goto bad;
  849         }
  850 
  851         /* Figure out header size. */
  852         rplen = HDRSIZE(sav);
  853         authsize = AUTHSIZE(sav);
  854 
  855         if (ipsec_debug)
  856           bzero(calc, sizeof(calc));
  857 
  858         /* Copy authenticator off the packet. */
  859         m_copydata(m, skip + rplen, authsize, calc);
  860 
  861         /*
  862          * If we have an mtag, we don't need to verify the authenticator --
  863          * it has been verified by an IPsec-aware NIC.
  864          */
  865         if (mtag == NULL) {
  866                 ptr = (caddr_t) (tc + 1);
  867 
  868                 /* Verify authenticator. */
  869                 if (bcmp(ptr + skip + rplen, calc, authsize)) {
  870                         u_int8_t *pppp = ptr + skip+rplen;
  871                         DPRINTF(("ah_input: authentication hash mismatch " \
  872                             "over %d bytes " \
  873                             "for packet in SA %s/%08lx:\n" \
  874                     "%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x, " \
  875                     "%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x\n",
  876                             authsize,
  877                             ipsec_address(&saidx->dst),
  878                             (u_long) ntohl(sav->spi),
  879                                  calc[0], calc[1], calc[2], calc[3],
  880                                  calc[4], calc[5], calc[6], calc[7],
  881                                  calc[8], calc[9], calc[10], calc[11],
  882                                  pppp[0], pppp[1], pppp[2], pppp[3],
  883                                  pppp[4], pppp[5], pppp[6], pppp[7],
  884                                  pppp[8], pppp[9], pppp[10], pppp[11]
  885                                  ));
  886                         ahstat.ahs_badauth++;
  887                         error = EACCES;
  888                         goto bad;
  889                 }
  890 
  891                 /* Fix the Next Protocol field. */
  892                 ((u_int8_t *) ptr)[protoff] = nxt;
  893 
  894                 /* Copyback the saved (uncooked) network headers. */
  895                 m_copyback(m, 0, skip, ptr);
  896         } else {
  897                 /* Fix the Next Protocol field. */
  898                 m_copyback(m, protoff, sizeof(u_int8_t), &nxt);
  899         }
  900 
  901         free(tc, M_XDATA), tc = NULL;                   /* No longer needed */
  902 
  903         /*
  904          * Header is now authenticated.
  905          */
  906         m->m_flags |= M_AUTHIPHDR|M_AUTHIPDGM;
  907 
  908         /*
  909          * Update replay sequence number, if appropriate.
  910          */
  911         if (sav->replay) {
  912                 u_int32_t seq;
  913 
  914                 m_copydata(m, skip + offsetof(struct newah, ah_seq),
  915                            sizeof (seq), (caddr_t) &seq);
  916                 if (ipsec_updatereplay(ntohl(seq), sav)) {
  917                         ahstat.ahs_replay++;
  918                         error = ENOBUFS;                        /*XXX as above*/
  919                         goto bad;
  920                 }
  921         }
  922 
  923         /*
  924          * Remove the AH header and authenticator from the mbuf.
  925          */
  926         error = m_striphdr(m, skip, rplen + authsize);
  927         if (error) {
  928                 DPRINTF(("ah_input_cb: mangled mbuf chain for SA %s/%08lx\n",
  929                     ipsec_address(&saidx->dst), (u_long) ntohl(sav->spi)));
  930 
  931                 ahstat.ahs_hdrops++;
  932                 goto bad;
  933         }
  934 
  935         IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, mtag);
  936 
  937         KEY_FREESAV(&sav);
  938         splx(s);
  939         return error;
  940 bad:
  941         if (sav)
  942                 KEY_FREESAV(&sav);
  943         splx(s);
  944         if (m != NULL)
  945                 m_freem(m);
  946         if (tc != NULL)
  947                 free(tc, M_XDATA);
  948         if (crp != NULL)
  949                 crypto_freereq(crp);
  950         return error;
  951 }
  952 
  953 /*
  954  * AH output routine, called by ipsec[46]_process_packet().
  955  */
  956 static int
  957 ah_output(
  958         struct mbuf *m,
  959         struct ipsecrequest *isr,
  960         struct mbuf **mp,
  961         int skip,
  962         int protoff)
  963 {
  964         struct secasvar *sav;
  965         struct auth_hash *ahx;
  966         struct cryptodesc *crda;
  967         struct tdb_crypto *tc;
  968         struct mbuf *mi;
  969         struct cryptop *crp;
  970         u_int16_t iplen;
  971         int error, rplen, authsize, maxpacketsize, roff;
  972         u_int8_t prot;
  973         struct newah *ah;
  974 
  975         IPSEC_SPLASSERT_SOFTNET("ah_output");
  976 
  977         sav = isr->sav;
  978         IPSEC_ASSERT(sav != NULL, ("ah_output: null SA"));
  979         ahx = sav->tdb_authalgxform;
  980         IPSEC_ASSERT(ahx != NULL, ("ah_output: null authentication xform"));
  981 
  982         ahstat.ahs_output++;
  983 
  984         /* Figure out header size. */
  985         rplen = HDRSIZE(sav);
  986 
  987         /* Check for maximum packet size violations. */
  988         switch (sav->sah->saidx.dst.sa.sa_family) {
  989 #ifdef INET
  990         case AF_INET:
  991                 maxpacketsize = IP_MAXPACKET;
  992                 break;
  993 #endif /* INET */
  994 #ifdef INET6
  995         case AF_INET6:
  996                 maxpacketsize = IPV6_MAXPACKET;
  997                 break;
  998 #endif /* INET6 */
  999         default:
 1000                 DPRINTF(("ah_output: unknown/unsupported protocol "
 1001                     "family %u, SA %s/%08lx\n",
 1002                     sav->sah->saidx.dst.sa.sa_family,
 1003                     ipsec_address(&sav->sah->saidx.dst),
 1004                     (u_long) ntohl(sav->spi)));
 1005                 ahstat.ahs_nopf++;
 1006                 error = EPFNOSUPPORT;
 1007                 goto bad;
 1008         }
 1009         authsize = AUTHSIZE(sav);
 1010         if (rplen + authsize + m->m_pkthdr.len > maxpacketsize) {
 1011                 DPRINTF(("ah_output: packet in SA %s/%08lx got too big "
 1012                     "(len %u, max len %u)\n",
 1013                     ipsec_address(&sav->sah->saidx.dst),
 1014                     (u_long) ntohl(sav->spi),
 1015                     rplen + authsize + m->m_pkthdr.len, maxpacketsize));
 1016                 ahstat.ahs_toobig++;
 1017                 error = EMSGSIZE;
 1018                 goto bad;
 1019         }
 1020 
 1021         /* Update the counters. */
 1022         ahstat.ahs_obytes += m->m_pkthdr.len - skip;
 1023 
 1024         m = m_clone(m);
 1025         if (m == NULL) {
 1026                 DPRINTF(("ah_output: cannot clone mbuf chain, SA %s/%08lx\n",
 1027                     ipsec_address(&sav->sah->saidx.dst),
 1028                     (u_long) ntohl(sav->spi)));
 1029                 ahstat.ahs_hdrops++;
 1030                 error = ENOBUFS;
 1031                 goto bad;
 1032         }
 1033 
 1034         /* Inject AH header. */
 1035         mi = m_makespace(m, skip, rplen + authsize, &roff);
 1036         if (mi == NULL) {
 1037                 DPRINTF(("ah_output: failed to inject %u byte AH header for SA "
 1038                     "%s/%08lx\n",
 1039                     rplen + authsize,
 1040                     ipsec_address(&sav->sah->saidx.dst),
 1041                     (u_long) ntohl(sav->spi)));
 1042                 ahstat.ahs_hdrops++;            /*XXX differs from openbsd */
 1043                 error = ENOBUFS;
 1044                 goto bad;
 1045         }
 1046 
 1047         /*
 1048          * The AH header is guaranteed by m_makespace() to be in
 1049          * contiguous memory, at roff bytes offset into the returned mbuf.
 1050          */
 1051         ah = (struct newah *)(mtod(mi, caddr_t) + roff);
 1052 
 1053         /* Initialize the AH header. */
 1054         m_copydata(m, protoff, sizeof(u_int8_t), (caddr_t) &ah->ah_nxt);
 1055         ah->ah_len = (rplen + authsize - sizeof(struct ah)) / sizeof(u_int32_t);
 1056         ah->ah_reserve = 0;
 1057         ah->ah_spi = sav->spi;
 1058 
 1059         /* Zeroize authenticator. */
 1060         m_copyback(m, skip + rplen, authsize, ipseczeroes);
 1061 
 1062         /* Insert packet replay counter, as requested.  */
 1063         if (sav->replay) {
 1064                 if (sav->replay->count == ~0 &&
 1065                     (sav->flags & SADB_X_EXT_CYCSEQ) == 0) {
 1066                         DPRINTF(("ah_output: replay counter wrapped for SA "
 1067                                 "%s/%08lx\n",
 1068                                 ipsec_address(&sav->sah->saidx.dst),
 1069                                 (u_long) ntohl(sav->spi)));
 1070                         ahstat.ahs_wrap++;
 1071                         error = EINVAL;
 1072                         goto bad;
 1073                 }
 1074                 sav->replay->count++;
 1075                 ah->ah_seq = htonl(sav->replay->count);
 1076         }
 1077 
 1078         /* Get crypto descriptors. */
 1079         crp = crypto_getreq(1);
 1080         if (crp == NULL) {
 1081                 DPRINTF(("ah_output: failed to acquire crypto descriptors\n"));
 1082                 ahstat.ahs_crypto++;
 1083                 error = ENOBUFS;
 1084                 goto bad;
 1085         }
 1086 
 1087         crda = crp->crp_desc;
 1088 
 1089         crda->crd_skip = 0;
 1090         crda->crd_inject = skip + rplen;
 1091         crda->crd_len = m->m_pkthdr.len;
 1092 
 1093         /* Authentication operation. */
 1094         crda->crd_alg = ahx->type;
 1095         crda->crd_key = _KEYBUF(sav->key_auth);
 1096         crda->crd_klen = _KEYBITS(sav->key_auth);
 1097 
 1098         /* Allocate IPsec-specific opaque crypto info. */
 1099         tc = (struct tdb_crypto *) malloc(
 1100                 sizeof(struct tdb_crypto) + skip, M_XDATA, M_NOWAIT|M_ZERO);
 1101         if (tc == NULL) {
 1102                 crypto_freereq(crp);
 1103                 DPRINTF(("ah_output: failed to allocate tdb_crypto\n"));
 1104                 ahstat.ahs_crypto++;
 1105                 error = ENOBUFS;
 1106                 goto bad;
 1107         }
 1108 
 1109         /* Save the skipped portion of the packet. */
 1110         m_copydata(m, 0, skip, (caddr_t) (tc + 1));
 1111 
 1112         /*
 1113          * Fix IP header length on the header used for
 1114          * authentication. We don't need to fix the original
 1115          * header length as it will be fixed by our caller.
 1116          */
 1117         switch (sav->sah->saidx.dst.sa.sa_family) {
 1118 #ifdef INET
 1119         case AF_INET:
 1120                 bcopy(((caddr_t)(tc + 1)) +
 1121                     offsetof(struct ip, ip_len),
 1122                     (caddr_t) &iplen, sizeof(u_int16_t));
 1123                 iplen = htons(ntohs(iplen) + rplen + authsize);
 1124                 m_copyback(m, offsetof(struct ip, ip_len),
 1125                     sizeof(u_int16_t), (caddr_t) &iplen);
 1126                 break;
 1127 #endif /* INET */
 1128 
 1129 #ifdef INET6
 1130         case AF_INET6:
 1131                 bcopy(((caddr_t)(tc + 1)) +
 1132                     offsetof(struct ip6_hdr, ip6_plen),
 1133                     (caddr_t) &iplen, sizeof(u_int16_t));
 1134                 iplen = htons(ntohs(iplen) + rplen + authsize);
 1135                 m_copyback(m, offsetof(struct ip6_hdr, ip6_plen),
 1136                     sizeof(u_int16_t), (caddr_t) &iplen);
 1137                 break;
 1138 #endif /* INET6 */
 1139         }
 1140 
 1141         /* Fix the Next Header field in saved header. */
 1142         ((u_int8_t *) (tc + 1))[protoff] = IPPROTO_AH;
 1143 
 1144         /* Update the Next Protocol field in the IP header. */
 1145         prot = IPPROTO_AH;
 1146         m_copyback(m, protoff, sizeof(u_int8_t), (caddr_t) &prot);
 1147 
 1148         /* "Massage" the packet headers for crypto processing. */
 1149         error = ah_massage_headers(&m, sav->sah->saidx.dst.sa.sa_family,
 1150                         skip, ahx->type, 1);
 1151         if (error != 0) {
 1152                 m = NULL;       /* mbuf was free'd by ah_massage_headers. */
 1153                 free(tc, M_XDATA);
 1154                 crypto_freereq(crp);
 1155                 goto bad;
 1156         }
 1157 
 1158         /* Crypto operation descriptor. */
 1159         crp->crp_ilen = m->m_pkthdr.len; /* Total input length. */
 1160         crp->crp_flags = CRYPTO_F_IMBUF;
 1161         crp->crp_buf = (caddr_t) m;
 1162         crp->crp_callback = ah_output_cb;
 1163         crp->crp_sid = sav->tdb_cryptoid;
 1164         crp->crp_opaque = (caddr_t) tc;
 1165 
 1166         /* These are passed as-is to the callback. */
 1167         tc->tc_isr = isr;
 1168         tc->tc_spi = sav->spi;
 1169         tc->tc_dst = sav->sah->saidx.dst;
 1170         tc->tc_proto = sav->sah->saidx.proto;
 1171         tc->tc_skip = skip;
 1172         tc->tc_protoff = protoff;
 1173 
 1174         return crypto_dispatch(crp);
 1175 bad:
 1176         if (m)
 1177                 m_freem(m);
 1178         return (error);
 1179 }
 1180 
 1181 /*
 1182  * AH output callback from the crypto driver.
 1183  */
 1184 static int
 1185 ah_output_cb(struct cryptop *crp)
 1186 {
 1187         int skip, protoff, error;
 1188         struct tdb_crypto *tc;
 1189         struct ipsecrequest *isr;
 1190         struct secasvar *sav;
 1191         struct mbuf *m;
 1192         caddr_t ptr;
 1193         int s, err;
 1194 
 1195         tc = (struct tdb_crypto *) crp->crp_opaque;
 1196         IPSEC_ASSERT(tc != NULL, ("ah_output_cb: null opaque data area!"));
 1197         skip = tc->tc_skip;
 1198         protoff = tc->tc_protoff;
 1199         ptr = (caddr_t) (tc + 1);
 1200         m = (struct mbuf *) crp->crp_buf;
 1201 
 1202         s = splsoftnet();
 1203 
 1204         isr = tc->tc_isr;
 1205         sav = KEY_ALLOCSA(&tc->tc_dst, tc->tc_proto, tc->tc_spi);
 1206         if (sav == NULL) {
 1207                 ahstat.ahs_notdb++;
 1208                 DPRINTF(("ah_output_cb: SA expired while in crypto\n"));
 1209                 error = ENOBUFS;                /*XXX*/
 1210                 goto bad;
 1211         }
 1212         IPSEC_ASSERT(isr->sav == sav, ("ah_output_cb: SA changed\n"));
 1213 
 1214         /* Check for crypto errors. */
 1215         if (crp->crp_etype) {
 1216                 if (sav->tdb_cryptoid != 0)
 1217                         sav->tdb_cryptoid = crp->crp_sid;
 1218 
 1219                 if (crp->crp_etype == EAGAIN) {
 1220                         KEY_FREESAV(&sav);
 1221                         splx(s);
 1222                         return crypto_dispatch(crp);
 1223                 }
 1224 
 1225                 ahstat.ahs_noxform++;
 1226                 DPRINTF(("ah_output_cb: crypto error %d\n", crp->crp_etype));
 1227                 error = crp->crp_etype;
 1228                 goto bad;
 1229         }
 1230 
 1231         /* Shouldn't happen... */
 1232         if (m == NULL) {
 1233                 ahstat.ahs_crypto++;
 1234                 DPRINTF(("ah_output_cb: bogus returned buffer from crypto\n"));
 1235                 error = EINVAL;
 1236                 goto bad;
 1237         }
 1238         ahstat.ahs_hist[sav->alg_auth]++;
 1239 
 1240         /*
 1241          * Copy original headers (with the new protocol number) back
 1242          * in place.
 1243          */
 1244         m_copyback(m, 0, skip, ptr);
 1245 
 1246         /* No longer needed. */
 1247         free(tc, M_XDATA);
 1248         crypto_freereq(crp);
 1249 
 1250         /* NB: m is reclaimed by ipsec_process_done. */
 1251         err = ipsec_process_done(m, isr);
 1252         KEY_FREESAV(&sav);
 1253         splx(s);
 1254         return err;
 1255 bad:
 1256         if (sav)
 1257                 KEY_FREESAV(&sav);
 1258         splx(s);
 1259         if (m)
 1260                 m_freem(m);
 1261         free(tc, M_XDATA);
 1262         crypto_freereq(crp);
 1263         return error;
 1264 }
 1265 
 1266 static struct xformsw ah_xformsw = {
 1267         XF_AH,          XFT_AUTH,       "IPsec AH",
 1268         ah_init,        ah_zeroize,     ah_input,       ah_output,
 1269 };
 1270 
 1271 INITFN void
 1272 ah_attach(void)
 1273 {
 1274         xform_register(&ah_xformsw);
 1275 }
 1276 
 1277 #ifdef __FreeBSD__
 1278 SYSINIT(ah_xform_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, ah_attach, NULL);
 1279 #endif

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