xform_ah.c

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    1 /*      $NetBSD: xform_ah.c,v 1.114 2022/05/22 11:40:29 riastradh Exp $ */
    2 /*      $FreeBSD: 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 1.114 2022/05/22 11:40:29 riastradh Exp $");
   43 
   44 #if defined(_KERNEL_OPT)
   45 #include "opt_inet.h"
   46 #include "opt_ipsec.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 #include <sys/pool.h>
   57 #include <sys/pserialize.h>
   58 #include <sys/kmem.h>
   59 
   60 #include <net/if.h>
   61 
   62 #include <netinet/in.h>
   63 #include <netinet/in_systm.h>
   64 #include <netinet/ip.h>
   65 #include <netinet/ip_ecn.h>
   66 #include <netinet/ip_var.h>
   67 #include <netinet/ip6.h>
   68 
   69 #include <net/route.h>
   70 #include <netipsec/ipsec.h>
   71 #include <netipsec/ipsec_private.h>
   72 #include <netipsec/ah.h>
   73 #include <netipsec/ah_var.h>
   74 #include <netipsec/xform.h>
   75 
   76 #ifdef INET6
   77 #include <netinet6/ip6_var.h>
   78 #include <netinet6/scope6_var.h>
   79 #include <netipsec/ipsec6.h>
   80 #endif
   81 
   82 #include <netipsec/key.h>
   83 #include <netipsec/key_debug.h>
   84 
   85 #include <opencrypto/cryptodev.h>
   86 
   87 /*
   88  * Return header size in bytes.  The old protocol did not support
   89  * the replay counter; the new protocol always includes the counter.
   90  */
   91 #define HDRSIZE(sav) \
   92         (((sav)->flags & SADB_X_EXT_OLD) ? \
   93                 sizeof(struct ah) : sizeof(struct ah) + sizeof(uint32_t))
   94 /*
   95  * Return authenticator size in bytes.  The old protocol is known
   96  * to use a fixed 16-byte authenticator.  The new algorithm gets
   97  * this size from the xform but is (currently) always 12.
   98  */
   99 #define AUTHSIZE(sav) \
  100         ((sav->flags & SADB_X_EXT_OLD) ? 16 : (sav)->tdb_authalgxform->authsize)
  101 
  102 percpu_t *ahstat_percpu;
  103 
  104 int ah_enable = 1;                      /* control flow of packets with AH */
  105 int ip4_ah_cleartos = 1;                /* clear ip_tos when doing AH calc */
  106 
  107 static const char ipseczeroes[256];
  108 
  109 int ah_max_authsize;                    /* max authsize over all algorithms */
  110 
  111 static void ah_input_cb(struct cryptop *);
  112 static void ah_output_cb(struct cryptop *);
  113 
  114 const uint8_t ah_stats[256] = { SADB_AALG_STATS_INIT };
  115 
  116 static pool_cache_t ah_tdb_crypto_pool_cache;
  117 static size_t ah_pool_item_size;
  118 
  119 /*
  120  * NB: this is public for use by the PF_KEY support.
  121  */
  122 const struct auth_hash *
  123 ah_algorithm_lookup(int alg)
  124 {
  125 
  126         switch (alg) {
  127         case SADB_X_AALG_NULL:
  128                 return &auth_hash_null;
  129         case SADB_AALG_MD5HMAC:
  130                 return &auth_hash_hmac_md5_96;
  131         case SADB_AALG_SHA1HMAC:
  132                 return &auth_hash_hmac_sha1_96;
  133         case SADB_X_AALG_RIPEMD160HMAC:
  134                 return &auth_hash_hmac_ripemd_160_96;
  135         case SADB_X_AALG_MD5:
  136                 return &auth_hash_key_md5;
  137         case SADB_X_AALG_SHA:
  138                 return &auth_hash_key_sha1;
  139         case SADB_X_AALG_SHA2_256:
  140                 return &auth_hash_hmac_sha2_256;
  141         case SADB_X_AALG_SHA2_384:
  142                 return &auth_hash_hmac_sha2_384;
  143         case SADB_X_AALG_SHA2_512:
  144                 return &auth_hash_hmac_sha2_512;
  145         case SADB_X_AALG_AES_XCBC_MAC:
  146                 return &auth_hash_aes_xcbc_mac_96;
  147         }
  148         return NULL;
  149 }
  150 
  151 size_t
  152 ah_authsiz(const struct secasvar *sav)
  153 {
  154         size_t size;
  155 
  156         if (sav == NULL) {
  157                 return ah_max_authsize;
  158         }
  159 
  160         size = AUTHSIZE(sav);
  161         return roundup(size, sizeof(uint32_t));
  162 }
  163 
  164 size_t
  165 ah_hdrsiz(const struct secasvar *sav)
  166 {
  167         size_t size;
  168 
  169         if (sav != NULL) {
  170                 int authsize, rplen, align;
  171 
  172                 KASSERT(sav->tdb_authalgxform != NULL);
  173                 /*XXX not right for null algorithm--does it matter??*/
  174 
  175                 /* RFC4302: use the correct alignment. */
  176                 align = sizeof(uint32_t);
  177 #ifdef INET6
  178                 if (sav->sah->saidx.dst.sa.sa_family == AF_INET6) {
  179                         align = sizeof(uint64_t);
  180                 }
  181 #endif
  182                 rplen = HDRSIZE(sav);
  183                 authsize = AUTHSIZE(sav);
  184                 size = roundup(rplen + authsize, align);
  185         } else {
  186                 /* default guess */
  187                 size = sizeof(struct ah) + sizeof(uint32_t) + ah_max_authsize;
  188         }
  189         return size;
  190 }
  191 
  192 /*
  193  * NB: public for use by esp_init.
  194  */
  195 int
  196 ah_init0(struct secasvar *sav, const struct xformsw *xsp,
  197          struct cryptoini *cria)
  198 {
  199         const struct auth_hash *thash;
  200         int keylen;
  201 
  202         thash = ah_algorithm_lookup(sav->alg_auth);
  203         if (thash == NULL) {
  204                 DPRINTF("unsupported authentication algorithm %u\n",
  205                     sav->alg_auth);
  206                 return EINVAL;
  207         }
  208         /*
  209          * Verify the replay state block allocation is consistent with
  210          * the protocol type.  We check here so we can make assumptions
  211          * later during protocol processing.
  212          */
  213         /* NB: replay state is setup elsewhere (sigh) */
  214         if (((sav->flags&SADB_X_EXT_OLD) == 0) ^ (sav->replay != NULL)) {
  215                 DPRINTF("replay state block inconsistency, "
  216                     "%s algorithm %s replay state\n",
  217                     (sav->flags & SADB_X_EXT_OLD) ? "old" : "new",
  218                     sav->replay == NULL ? "without" : "with");
  219                 return EINVAL;
  220         }
  221         if (sav->key_auth == NULL) {
  222                 DPRINTF("no authentication key for %s algorithm\n",
  223                     thash->name);
  224                 return EINVAL;
  225         }
  226         keylen = _KEYLEN(sav->key_auth);
  227         if (keylen != thash->keysize && thash->keysize != 0) {
  228                 DPRINTF("invalid keylength %d, algorithm %s requires "
  229                     "keysize %d\n",
  230                     keylen, thash->name, thash->keysize);
  231                 return EINVAL;
  232         }
  233 
  234         sav->tdb_xform = xsp;
  235         sav->tdb_authalgxform = thash;
  236 
  237         /* Initialize crypto session. */
  238         memset(cria, 0, sizeof(*cria));
  239         cria->cri_alg = sav->tdb_authalgxform->type;
  240         cria->cri_klen = _KEYBITS(sav->key_auth);
  241         cria->cri_key = _KEYBUF(sav->key_auth);
  242 
  243         return 0;
  244 }
  245 
  246 /*
  247  * ah_init() is called when an SPI is being set up.
  248  */
  249 static int
  250 ah_init(struct secasvar *sav, const struct xformsw *xsp)
  251 {
  252         struct cryptoini cria;
  253         int error;
  254 
  255         error = ah_init0(sav, xsp, &cria);
  256         if (!error)
  257                 error = crypto_newsession(&sav->tdb_cryptoid,
  258                                            &cria, crypto_support);
  259         return error;
  260 }
  261 
  262 /*
  263  * Paranoia.
  264  *
  265  * NB: public for use by esp_zeroize (XXX).
  266  */
  267 void
  268 ah_zeroize(struct secasvar *sav)
  269 {
  270 
  271         if (sav->key_auth) {
  272                 explicit_memset(_KEYBUF(sav->key_auth), 0,
  273                     _KEYLEN(sav->key_auth));
  274         }
  275 
  276         crypto_freesession(sav->tdb_cryptoid);
  277         sav->tdb_cryptoid = 0;
  278         sav->tdb_authalgxform = NULL;
  279         sav->tdb_xform = NULL;
  280 }
  281 
  282 /*
  283  * Massage IPv4/IPv6 headers for AH processing.
  284  */
  285 static int
  286 ah_massage_headers(struct mbuf **m0, int proto, int skip, int alg, int out)
  287 {
  288         struct mbuf *m = *m0;
  289         unsigned char *ptr;
  290         int off, optlen;
  291 #ifdef INET
  292         struct ip *ip;
  293 #endif
  294 #ifdef INET6
  295         int count, ip6optlen;
  296         struct ip6_ext *ip6e;
  297         struct ip6_hdr ip6;
  298         int alloc, nxt;
  299 #endif
  300 
  301         switch (proto) {
  302 #ifdef INET
  303         case AF_INET:
  304                 /*
  305                  * This is the least painful way of dealing with IPv4 header
  306                  * and option processing -- just make sure they're in
  307                  * contiguous memory.
  308                  */
  309                 *m0 = m = m_pullup(m, skip);
  310                 if (m == NULL) {
  311                         DPRINTF("m_pullup failed\n");
  312                         return ENOBUFS;
  313                 }
  314 
  315                 /* Fix the IP header */
  316                 ip = mtod(m, struct ip *);
  317                 if (ip4_ah_cleartos)
  318                         ip->ip_tos = 0;
  319                 ip->ip_ttl = 0;
  320                 ip->ip_sum = 0;
  321                 ip->ip_off = htons(ntohs(ip->ip_off) & ip4_ah_offsetmask);
  322 
  323                 if (alg == CRYPTO_MD5_KPDK || alg == CRYPTO_SHA1_KPDK)
  324                         ip->ip_off &= htons(IP_DF);
  325                 else
  326                         ip->ip_off = 0;
  327 
  328                 ptr = mtod(m, unsigned char *);
  329 
  330                 /* IPv4 option processing */
  331                 for (off = sizeof(struct ip); off < skip;) {
  332                         if (ptr[off] == IPOPT_EOL) {
  333                                 break;
  334                         } else if (ptr[off] == IPOPT_NOP) {
  335                                 optlen = 1;
  336                         } else if (off + 1 < skip) {
  337                                 optlen = ptr[off + 1];
  338                                 if (optlen < 2 || off + optlen > skip) {
  339                                         m_freem(m);
  340                                         return EINVAL;
  341                                 }
  342                         } else {
  343                                 m_freem(m);
  344                                 return EINVAL;
  345                         }
  346 
  347                         switch (ptr[off]) {
  348                         case IPOPT_NOP:
  349                         case IPOPT_SECURITY:
  350                         case 0x85:      /* Extended security. */
  351                         case 0x86:      /* Commercial security. */
  352                         case 0x94:      /* Router alert */
  353                         case 0x95:      /* RFC1770 */
  354                                 break;
  355 
  356                         case IPOPT_LSRR:
  357                         case IPOPT_SSRR:
  358                                 /*
  359                                  * On output, if we have either of the
  360                                  * source routing options, we should
  361                                  * swap the destination address of the
  362                                  * IP header with the last address
  363                                  * specified in the option, as that is
  364                                  * what the destination's IP header
  365                                  * will look like.
  366                                  */
  367                                 if (out)
  368                                         memcpy(&ip->ip_dst,
  369                                             ptr + off + optlen -
  370                                             sizeof(struct in_addr),
  371                                             sizeof(struct in_addr));
  372                                 /* FALLTHROUGH */
  373 
  374                         default:
  375                                 /* Zeroize all other options. */
  376                                 memset(ptr + off, 0, optlen);
  377                                 break;
  378                         }
  379 
  380                         off += optlen;
  381 
  382                         /* Sanity check. */
  383                         if (off > skip) {
  384                                 m_freem(m);
  385                                 return EINVAL;
  386                         }
  387                 }
  388 
  389                 break;
  390 #endif /* INET */
  391 
  392 #ifdef INET6
  393         case AF_INET6:  /* Ugly... */
  394                 /* Copy and "cook" the IPv6 header. */
  395                 m_copydata(m, 0, sizeof(ip6), &ip6);
  396 
  397                 /* We don't do IPv6 Jumbograms. */
  398                 if (ip6.ip6_plen == 0) {
  399                         DPRINTF("unsupported IPv6 jumbogram\n");
  400                         m_freem(m);
  401                         return EMSGSIZE;
  402                 }
  403 
  404                 ip6.ip6_flow = 0;
  405                 ip6.ip6_hlim = 0;
  406                 ip6.ip6_vfc &= ~IPV6_VERSION_MASK;
  407                 ip6.ip6_vfc |= IPV6_VERSION;
  408 
  409                 /* Scoped address handling. */
  410                 if (IN6_IS_SCOPE_LINKLOCAL(&ip6.ip6_src))
  411                         ip6.ip6_src.s6_addr16[1] = 0;
  412                 if (IN6_IS_SCOPE_LINKLOCAL(&ip6.ip6_dst))
  413                         ip6.ip6_dst.s6_addr16[1] = 0;
  414 
  415                 /* Done with IPv6 header. */
  416                 m_copyback(m, 0, sizeof(struct ip6_hdr), &ip6);
  417 
  418                 ip6optlen = skip - sizeof(struct ip6_hdr);
  419 
  420                 /* Let's deal with the remaining headers (if any). */
  421                 if (ip6optlen > 0) {
  422                         if (m->m_len <= skip) {
  423                                 ptr = malloc(ip6optlen, M_XDATA, M_NOWAIT);
  424                                 if (ptr == NULL) {
  425                                         DPRINTF("failed to allocate "
  426                                             "memory for IPv6 headers\n");
  427                                         m_freem(m);
  428                                         return ENOBUFS;
  429                                 }
  430 
  431                                 /*
  432                                  * Copy all the protocol headers after
  433                                  * the IPv6 header.
  434                                  */
  435                                 m_copydata(m, sizeof(struct ip6_hdr),
  436                                     ip6optlen, ptr);
  437                                 alloc = 1;
  438                         } else {
  439                                 /* No need to allocate memory. */
  440                                 ptr = mtod(m, unsigned char *) +
  441                                     sizeof(struct ip6_hdr);
  442                                 alloc = 0;
  443                         }
  444                 } else
  445                         break;
  446 
  447                 nxt = ip6.ip6_nxt & 0xff; /* Next header type. */
  448 
  449                 for (off = 0; off < ip6optlen;) {
  450                         int noff;
  451 
  452                         if (off + sizeof(*ip6e) > ip6optlen) {
  453                                 goto error6;
  454                         }
  455                         ip6e = (struct ip6_ext *)(ptr + off);
  456                         noff = off + ((ip6e->ip6e_len + 1) << 3);
  457                         if (noff > ip6optlen) {
  458                                 goto error6;
  459                         }
  460 
  461                         switch (nxt) {
  462                         case IPPROTO_HOPOPTS:
  463                         case IPPROTO_DSTOPTS:
  464                                 /* Zero out mutable options. */
  465                                 for (count = off + sizeof(struct ip6_ext);
  466                                      count < noff;) {
  467                                         if (ptr[count] == IP6OPT_PAD1) {
  468                                                 count++;
  469                                                 continue;
  470                                         }
  471 
  472                                         if (count + 1 >= noff) {
  473                                                 goto error6;
  474                                         }
  475                                         optlen = ptr[count + 1] + 2;
  476 
  477                                         if (count + optlen > noff) {
  478                                                 goto error6;
  479                                         }
  480 
  481                                         if (ptr[count] & IP6OPT_MUTABLE) {
  482                                                 memset(ptr + count, 0, optlen);
  483                                         }
  484 
  485                                         count += optlen;
  486                                 }
  487                                 if (count != noff) {
  488                                         goto error6;
  489                                 }
  490                                 /* FALLTHROUGH */
  491 
  492                         case IPPROTO_ROUTING:
  493                                 /* Advance. */
  494                                 off = noff;
  495                                 nxt = ip6e->ip6e_nxt;
  496                                 break;
  497 
  498                         default:
  499 error6:
  500                                 if (alloc)
  501                                         free(ptr, M_XDATA);
  502                                 m_freem(m);
  503                                 return EINVAL;
  504                         }
  505                 }
  506 
  507                 /* Copyback and free, if we allocated. */
  508                 if (alloc) {
  509                         m_copyback(m, sizeof(struct ip6_hdr), ip6optlen, ptr);
  510                         free(ptr, M_XDATA);
  511                 }
  512 
  513                 break;
  514 #endif /* INET6 */
  515         }
  516 
  517         return 0;
  518 }
  519 
  520 /*
  521  * ah_input() gets called to verify that an input packet
  522  * passes authentication.
  523  */
  524 static int
  525 ah_input(struct mbuf *m, struct secasvar *sav, int skip, int protoff)
  526 {
  527         const struct auth_hash *ahx;
  528         struct tdb_crypto *tc = NULL;
  529         struct newah *ah;
  530         int hl, rplen, authsize, ahsize, error, stat = AH_STAT_HDROPS;
  531         struct cryptodesc *crda;
  532         struct cryptop *crp = NULL;
  533         bool pool_used;
  534         uint8_t nxt;
  535 
  536         KASSERT(sav != NULL);
  537         KASSERT(sav->key_auth != NULL);
  538         KASSERT(sav->tdb_authalgxform != NULL);
  539 
  540         /* Figure out header size. */
  541         rplen = HDRSIZE(sav);
  542 
  543         /* XXX don't pullup, just copy header */
  544         M_REGION_GET(ah, struct newah *, m, skip, rplen);
  545         if (ah == NULL) {
  546                 /* m already freed */
  547                 return ENOBUFS;
  548         }
  549 
  550         nxt = ah->ah_nxt;
  551 
  552         /* Check replay window, if applicable. */
  553         if (sav->replay && !ipsec_chkreplay(ntohl(ah->ah_seq), sav)) {
  554                 char buf[IPSEC_LOGSASTRLEN];
  555                 DPRINTF("packet replay failure: %s\n",
  556                     ipsec_logsastr(sav, buf, sizeof(buf)));
  557                 stat = AH_STAT_REPLAY;
  558                 error = EACCES;
  559                 goto bad;
  560         }
  561 
  562         /* Verify AH header length. */
  563         hl = sizeof(struct ah) + (ah->ah_len * sizeof(uint32_t));
  564         ahx = sav->tdb_authalgxform;
  565         authsize = AUTHSIZE(sav);
  566         ahsize = ah_hdrsiz(sav);
  567         if (hl != ahsize) {
  568                 char buf[IPSEC_ADDRSTRLEN];
  569                 DPRINTF("bad authenticator length %u (expecting %lu)"
  570                     " for packet in SA %s/%08lx\n",
  571                     hl, (u_long)ahsize,
  572                     ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)),
  573                     (u_long) ntohl(sav->spi));
  574                 stat = AH_STAT_BADAUTHL;
  575                 error = EACCES;
  576                 goto bad;
  577         }
  578         if (skip + ahsize > m->m_pkthdr.len) {
  579                 char buf[IPSEC_ADDRSTRLEN];
  580                 DPRINTF("bad mbuf length %u (expecting >= %lu)"
  581                     " for packet in SA %s/%08lx\n",
  582                     m->m_pkthdr.len, (u_long)(skip + ahsize),
  583                     ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)),
  584                     (u_long) ntohl(sav->spi));
  585                 stat = AH_STAT_BADAUTHL;
  586                 error = EACCES;
  587                 goto bad;
  588         }
  589 
  590         AH_STATADD(AH_STAT_IBYTES, m->m_pkthdr.len - skip - hl);
  591 
  592         /* Get crypto descriptors. */
  593         crp = crypto_getreq(1);
  594         if (crp == NULL) {
  595                 DPRINTF("failed to acquire crypto descriptor\n");
  596                 stat = AH_STAT_CRYPTO;
  597                 error = ENOBUFS;
  598                 goto bad;
  599         }
  600 
  601         crda = crp->crp_desc;
  602         KASSERT(crda != NULL);
  603 
  604         crda->crd_skip = 0;
  605         crda->crd_len = m->m_pkthdr.len;
  606         crda->crd_inject = skip + rplen;
  607 
  608         /* Authentication operation. */
  609         crda->crd_alg = ahx->type;
  610         crda->crd_key = _KEYBUF(sav->key_auth);
  611         crda->crd_klen = _KEYBITS(sav->key_auth);
  612 
  613         /* Allocate IPsec-specific opaque crypto info. */
  614         size_t size = sizeof(*tc);
  615         size_t extra = skip + rplen + authsize;
  616         size += extra;
  617 
  618         if (__predict_true(size <= ah_pool_item_size)) {
  619                 tc = pool_cache_get(ah_tdb_crypto_pool_cache, PR_NOWAIT);
  620                 pool_used = true;
  621         } else {
  622                 /* size can exceed on IPv6 packets with large options.  */
  623                 tc = kmem_intr_zalloc(size, KM_NOSLEEP);
  624                 pool_used = false;
  625         }
  626         if (tc == NULL) {
  627                 DPRINTF("failed to allocate tdb_crypto\n");
  628                 stat = AH_STAT_CRYPTO;
  629                 error = ENOBUFS;
  630                 goto bad;
  631         }
  632 
  633         error = m_makewritable(&m, 0, extra, M_NOWAIT);
  634         if (error) {
  635                 DPRINTF("failed to m_makewritable\n");
  636                 goto bad;
  637         }
  638 
  639         /*
  640          * Save the authenticator, the skipped portion of the packet,
  641          * and the AH header.
  642          */
  643         m_copydata(m, 0, extra, (tc + 1));
  644         /* Zeroize the authenticator on the packet. */
  645         m_copyback(m, skip + rplen, authsize, ipseczeroes);
  646 
  647         /* "Massage" the packet headers for crypto processing. */
  648         error = ah_massage_headers(&m, sav->sah->saidx.dst.sa.sa_family,
  649             skip, ahx->type, 0);
  650         if (error != 0) {
  651                 /* NB: mbuf is free'd by ah_massage_headers */
  652                 m = NULL;
  653                 goto bad;
  654         }
  655 
  656     {
  657         int s = pserialize_read_enter();
  658 
  659         /*
  660          * Take another reference to the SA for opencrypto callback.
  661          */
  662         if (__predict_false(sav->state == SADB_SASTATE_DEAD)) {
  663                 pserialize_read_exit(s);
  664                 stat = AH_STAT_NOTDB;
  665                 error = ENOENT;
  666                 goto bad;
  667         }
  668         KEY_SA_REF(sav);
  669         pserialize_read_exit(s);
  670     }
  671 
  672         /* Crypto operation descriptor. */
  673         crp->crp_ilen = m->m_pkthdr.len; /* Total input length. */
  674         crp->crp_flags = CRYPTO_F_IMBUF;
  675         crp->crp_buf = m;
  676         crp->crp_callback = ah_input_cb;
  677         crp->crp_sid = sav->tdb_cryptoid;
  678         crp->crp_opaque = tc;
  679 
  680         /* These are passed as-is to the callback. */
  681         tc->tc_spi = sav->spi;
  682         tc->tc_dst = sav->sah->saidx.dst;
  683         tc->tc_proto = sav->sah->saidx.proto;
  684         tc->tc_nxt = nxt;
  685         tc->tc_protoff = protoff;
  686         tc->tc_skip = skip;
  687         tc->tc_sav = sav;
  688 
  689         DPRINTF("hash over %d bytes, skip %d: "
  690              "crda len %d skip %d inject %d\n",
  691              crp->crp_ilen, tc->tc_skip,
  692              crda->crd_len, crda->crd_skip, crda->crd_inject);
  693 
  694         crypto_dispatch(crp);
  695         return 0;
  696 
  697 bad:
  698         if (tc != NULL) {
  699                 if (__predict_true(pool_used))
  700                         pool_cache_put(ah_tdb_crypto_pool_cache, tc);
  701                 else
  702                         kmem_intr_free(tc, size);
  703         }
  704         if (crp != NULL)
  705                 crypto_freereq(crp);
  706         if (m != NULL)
  707                 m_freem(m);
  708         AH_STATINC(stat);
  709         return error;
  710 }
  711 
  712 #ifdef INET6
  713 #define IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff) do {                    \
  714         if (saidx->dst.sa.sa_family == AF_INET6) {                           \
  715                 (void)ipsec6_common_input_cb(m, sav, skip, protoff);         \
  716         } else {                                                             \
  717                 (void)ipsec4_common_input_cb(m, sav, skip, protoff);         \
  718         }                                                                    \
  719 } while (0)
  720 #else
  721 #define IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff)                         \
  722         ((void)ipsec4_common_input_cb(m, sav, skip, protoff))
  723 #endif
  724 
  725 /*
  726  * AH input callback from the crypto driver.
  727  */
  728 static void
  729 ah_input_cb(struct cryptop *crp)
  730 {
  731         char buf[IPSEC_ADDRSTRLEN];
  732         int rplen, ahsize, skip, protoff;
  733         unsigned char calc[AH_ALEN_MAX];
  734         struct mbuf *m;
  735         struct tdb_crypto *tc;
  736         struct secasvar *sav;
  737         struct secasindex *saidx;
  738         uint8_t nxt;
  739         char *ptr;
  740         int authsize;
  741         bool pool_used;
  742         size_t size;
  743         IPSEC_DECLARE_LOCK_VARIABLE;
  744 
  745         KASSERT(crp->crp_opaque != NULL);
  746         tc = crp->crp_opaque;
  747         skip = tc->tc_skip;
  748         nxt = tc->tc_nxt;
  749         protoff = tc->tc_protoff;
  750         m = crp->crp_buf;
  751 
  752         IPSEC_ACQUIRE_GLOBAL_LOCKS();
  753 
  754         sav = tc->tc_sav;
  755         saidx = &sav->sah->saidx;
  756         KASSERTMSG(saidx->dst.sa.sa_family == AF_INET ||
  757             saidx->dst.sa.sa_family == AF_INET6,
  758             "unexpected protocol family %u", saidx->dst.sa.sa_family);
  759 
  760         /* Figure out header size. */
  761         rplen = HDRSIZE(sav);
  762         authsize = AUTHSIZE(sav);
  763         ahsize = ah_hdrsiz(sav);
  764 
  765         size = sizeof(*tc) + skip + rplen + authsize;
  766         if (__predict_true(size <= ah_pool_item_size))
  767                 pool_used = true;
  768         else
  769                 pool_used = false;
  770 
  771         /* Check for crypto errors. */
  772         if (crp->crp_etype) {
  773                 if (sav->tdb_cryptoid != 0)
  774                         sav->tdb_cryptoid = crp->crp_sid;
  775 
  776                 AH_STATINC(AH_STAT_NOXFORM);
  777                 DPRINTF("crypto error %d\n", crp->crp_etype);
  778                 goto bad;
  779         } else {
  780                 AH_STATINC(AH_STAT_HIST + ah_stats[sav->alg_auth]);
  781                 crypto_freereq(crp);            /* No longer needed. */
  782                 crp = NULL;
  783         }
  784 
  785         if (ipsec_debug)
  786                 memset(calc, 0, sizeof(calc));
  787 
  788         /* Copy authenticator off the packet. */
  789         m_copydata(m, skip + rplen, authsize, calc);
  790 
  791         ptr = (char *)(tc + 1);
  792         const uint8_t *pppp = ptr + skip + rplen;
  793 
  794         /* Verify authenticator. */
  795         if (!consttime_memequal(pppp, calc, authsize)) {
  796                 DPRINTF("authentication hash mismatch " \
  797                     "over %d bytes " \
  798                     "for packet in SA %s/%08lx:\n" \
  799                     "%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x, " \
  800                     "%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x\n",
  801                     authsize, ipsec_address(&saidx->dst, buf, sizeof(buf)),
  802                     (u_long) ntohl(sav->spi),
  803                      calc[0], calc[1], calc[2], calc[3],
  804                      calc[4], calc[5], calc[6], calc[7],
  805                      calc[8], calc[9], calc[10], calc[11],
  806                      pppp[0], pppp[1], pppp[2], pppp[3],
  807                      pppp[4], pppp[5], pppp[6], pppp[7],
  808                      pppp[8], pppp[9], pppp[10], pppp[11]);
  809                 AH_STATINC(AH_STAT_BADAUTH);
  810                 goto bad;
  811         }
  812 
  813         /* Fix the Next Protocol field. */
  814         ptr[protoff] = nxt;
  815 
  816         /* Copyback the saved (uncooked) network headers. */
  817         m_copyback(m, 0, skip, ptr);
  818 
  819         if (__predict_true(pool_used))
  820                 pool_cache_put(ah_tdb_crypto_pool_cache, tc);
  821         else
  822                 kmem_intr_free(tc, size);
  823         tc = NULL;
  824 
  825         /*
  826          * Header is now authenticated.
  827          */
  828         m->m_flags |= M_AUTHIPHDR;
  829 
  830         /*
  831          * Update replay sequence number, if appropriate.
  832          */
  833         if (sav->replay) {
  834                 uint32_t seq;
  835 
  836                 m_copydata(m, skip + offsetof(struct newah, ah_seq),
  837                     sizeof(seq), &seq);
  838                 if (ipsec_updatereplay(ntohl(seq), sav)) {
  839                         AH_STATINC(AH_STAT_REPLAY);
  840                         goto bad;
  841                 }
  842         }
  843 
  844         /*
  845          * Remove the AH header and authenticator from the mbuf.
  846          */
  847         if (m_striphdr(m, skip, ahsize) != 0) {
  848                 DPRINTF("mangled mbuf chain for SA %s/%08lx\n",
  849                     ipsec_address(&saidx->dst, buf, sizeof(buf)),
  850                     (u_long) ntohl(sav->spi));
  851 
  852                 AH_STATINC(AH_STAT_HDROPS);
  853                 goto bad;
  854         }
  855 
  856         IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff);
  857 
  858         KEY_SA_UNREF(&sav);
  859         IPSEC_RELEASE_GLOBAL_LOCKS();
  860         return;
  861 
  862 bad:
  863         if (sav)
  864                 KEY_SA_UNREF(&sav);
  865         IPSEC_RELEASE_GLOBAL_LOCKS();
  866         if (m != NULL)
  867                 m_freem(m);
  868         if (tc != NULL) {
  869                 if (pool_used)
  870                         pool_cache_put(ah_tdb_crypto_pool_cache, tc);
  871                 else
  872                         kmem_intr_free(tc, size);
  873         }
  874         if (crp != NULL)
  875                 crypto_freereq(crp);
  876         return;
  877 }
  878 
  879 /*
  880  * AH output routine, called by ipsec[46]_process_packet().
  881  */
  882 static int
  883 ah_output(struct mbuf *m, const struct ipsecrequest *isr, struct secasvar *sav,
  884     int skip, int protoff, int flags)
  885 {
  886         char buf[IPSEC_ADDRSTRLEN];
  887         const struct auth_hash *ahx;
  888         struct cryptodesc *crda;
  889         struct tdb_crypto *tc;
  890         struct mbuf *mi;
  891         struct cryptop *crp;
  892         uint16_t iplen;
  893         int error, rplen, authsize, ahsize, maxpacketsize, roff;
  894         uint8_t prot;
  895         struct newah *ah;
  896         size_t ipoffs;
  897         bool pool_used;
  898 
  899         KASSERT(sav != NULL);
  900         KASSERT(sav->tdb_authalgxform != NULL);
  901         ahx = sav->tdb_authalgxform;
  902 
  903         AH_STATINC(AH_STAT_OUTPUT);
  904 
  905         /* Figure out header size. */
  906         rplen = HDRSIZE(sav);
  907         authsize = AUTHSIZE(sav);
  908         ahsize = ah_hdrsiz(sav);
  909 
  910         /* Check for maximum packet size violations. */
  911         switch (sav->sah->saidx.dst.sa.sa_family) {
  912 #ifdef INET
  913         case AF_INET:
  914                 maxpacketsize = IP_MAXPACKET;
  915                 ipoffs = offsetof(struct ip, ip_len);
  916                 break;
  917 #endif
  918 #ifdef INET6
  919         case AF_INET6:
  920                 maxpacketsize = IPV6_MAXPACKET;
  921                 ipoffs = offsetof(struct ip6_hdr, ip6_plen);
  922                 break;
  923 #endif
  924         default:
  925                 DPRINTF("unknown/unsupported protocol "
  926                     "family %u, SA %s/%08lx\n",
  927                     sav->sah->saidx.dst.sa.sa_family,
  928                     ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)),
  929                     (u_long) ntohl(sav->spi));
  930                 AH_STATINC(AH_STAT_NOPF);
  931                 error = EPFNOSUPPORT;
  932                 goto bad;
  933         }
  934         if (ahsize + m->m_pkthdr.len > maxpacketsize) {
  935                 DPRINTF("packet in SA %s/%08lx got too big "
  936                     "(len %u, max len %u)\n",
  937                     ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)),
  938                     (u_long) ntohl(sav->spi),
  939                     ahsize + m->m_pkthdr.len, maxpacketsize);
  940                 AH_STATINC(AH_STAT_TOOBIG);
  941                 error = EMSGSIZE;
  942                 goto bad;
  943         }
  944 
  945         /* Update the counters. */
  946         AH_STATADD(AH_STAT_OBYTES, m->m_pkthdr.len - skip);
  947 
  948         m = m_clone(m);
  949         if (m == NULL) {
  950                 DPRINTF("cannot clone mbuf chain, SA %s/%08lx\n",
  951                     ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)),
  952                     (u_long) ntohl(sav->spi));
  953                 AH_STATINC(AH_STAT_HDROPS);
  954                 error = ENOBUFS;
  955                 goto bad;
  956         }
  957 
  958         /* Inject AH header. */
  959         mi = m_makespace(m, skip, ahsize, &roff);
  960         if (mi == NULL) {
  961                 DPRINTF("failed to inject %u byte AH header for SA "
  962                     "%s/%08lx\n", ahsize,
  963                     ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)),
  964                     (u_long) ntohl(sav->spi));
  965                 AH_STATINC(AH_STAT_HDROPS);
  966                 error = ENOBUFS;
  967                 goto bad;
  968         }
  969 
  970         /*
  971          * The AH header is guaranteed by m_makespace() to be in
  972          * contiguous memory, at roff bytes offset into the returned mbuf.
  973          */
  974         ah = (struct newah *)(mtod(mi, char *) + roff);
  975 
  976         /* Initialize the AH header. */
  977         m_copydata(m, protoff, sizeof(uint8_t), &ah->ah_nxt);
  978         ah->ah_len = (ahsize - sizeof(struct ah)) / sizeof(uint32_t);
  979         ah->ah_reserve = 0;
  980         ah->ah_spi = sav->spi;
  981 
  982         /* Zeroize authenticator. */
  983         m_copyback(m, skip + rplen, authsize, ipseczeroes);
  984 
  985         /* Zeroize padding. */
  986         m_copyback(m, skip + rplen + authsize, ahsize - (rplen + authsize),
  987             ipseczeroes);
  988 
  989         /* Insert packet replay counter, as requested.  */
  990         if (sav->replay) {
  991                 if (sav->replay->count == ~0 &&
  992                     (sav->flags & SADB_X_EXT_CYCSEQ) == 0) {
  993                         DPRINTF("replay counter wrapped for SA %s/%08lx\n",
  994                             ipsec_address(&sav->sah->saidx.dst, buf,
  995                             sizeof(buf)), (u_long) ntohl(sav->spi));
  996                         AH_STATINC(AH_STAT_WRAP);
  997                         error = EINVAL;
  998                         goto bad;
  999                 }
 1000 #ifdef IPSEC_DEBUG
 1001                 /* Emulate replay attack when ipsec_replay is TRUE. */
 1002                 if (!ipsec_replay)
 1003 #endif
 1004                         sav->replay->count++;
 1005                 ah->ah_seq = htonl(sav->replay->count);
 1006         }
 1007 
 1008         /* Get crypto descriptors. */
 1009         crp = crypto_getreq(1);
 1010         if (crp == NULL) {
 1011                 DPRINTF("failed to acquire crypto descriptors\n");
 1012                 AH_STATINC(AH_STAT_CRYPTO);
 1013                 error = ENOBUFS;
 1014                 goto bad;
 1015         }
 1016 
 1017         crda = crp->crp_desc;
 1018 
 1019         crda->crd_skip = 0;
 1020         crda->crd_inject = skip + rplen;
 1021         crda->crd_len = m->m_pkthdr.len;
 1022 
 1023         /* Authentication operation. */
 1024         crda->crd_alg = ahx->type;
 1025         crda->crd_key = _KEYBUF(sav->key_auth);
 1026         crda->crd_klen = _KEYBITS(sav->key_auth);
 1027 
 1028         /* Allocate IPsec-specific opaque crypto info. */
 1029         size_t size = sizeof(*tc) + skip;
 1030 
 1031         if (__predict_true(size <= ah_pool_item_size)) {
 1032                 tc = pool_cache_get(ah_tdb_crypto_pool_cache, PR_NOWAIT);
 1033                 pool_used = true;
 1034         } else {
 1035                 /* size can exceed on IPv6 packets with large options.  */
 1036                 tc = kmem_intr_zalloc(size, KM_NOSLEEP);
 1037                 pool_used = false;
 1038         }
 1039         if (tc == NULL) {
 1040                 DPRINTF("failed to allocate tdb_crypto\n");
 1041                 AH_STATINC(AH_STAT_CRYPTO);
 1042                 error = ENOBUFS;
 1043                 goto bad_crp;
 1044         }
 1045 
 1046         uint8_t *pext = (char *)(tc + 1);
 1047         /* Save the skipped portion of the packet. */
 1048         m_copydata(m, 0, skip, pext);
 1049 
 1050         /*
 1051          * Fix IP header length on the header used for
 1052          * authentication. We don't need to fix the original
 1053          * header length as it will be fixed by our caller.
 1054          */
 1055         memcpy(&iplen, pext + ipoffs, sizeof(iplen));
 1056         iplen = htons(ntohs(iplen) + ahsize);
 1057         m_copyback(m, ipoffs, sizeof(iplen), &iplen);
 1058 
 1059         /* Fix the Next Header field in saved header. */
 1060         pext[protoff] = IPPROTO_AH;
 1061 
 1062         /* Update the Next Protocol field in the IP header. */
 1063         prot = IPPROTO_AH;
 1064         m_copyback(m, protoff, sizeof(prot), &prot);
 1065 
 1066         /* "Massage" the packet headers for crypto processing. */
 1067         error = ah_massage_headers(&m, sav->sah->saidx.dst.sa.sa_family,
 1068             skip, ahx->type, 1);
 1069         if (error != 0) {
 1070                 m = NULL;       /* mbuf was free'd by ah_massage_headers. */
 1071                 goto bad_tc;
 1072         }
 1073 
 1074     {
 1075         int s = pserialize_read_enter();
 1076 
 1077         /*
 1078          * Take another reference to the SP and the SA for opencrypto callback.
 1079          */
 1080         if (__predict_false(isr->sp->state == IPSEC_SPSTATE_DEAD ||
 1081             sav->state == SADB_SASTATE_DEAD)) {
 1082                 pserialize_read_exit(s);
 1083                 AH_STATINC(AH_STAT_NOTDB);
 1084                 error = ENOENT;
 1085                 goto bad_tc;
 1086         }
 1087         KEY_SP_REF(isr->sp);
 1088         KEY_SA_REF(sav);
 1089         pserialize_read_exit(s);
 1090     }
 1091 
 1092         /* Crypto operation descriptor. */
 1093         crp->crp_ilen = m->m_pkthdr.len; /* Total input length. */
 1094         crp->crp_flags = CRYPTO_F_IMBUF;
 1095         crp->crp_buf = m;
 1096         crp->crp_callback = ah_output_cb;
 1097         crp->crp_sid = sav->tdb_cryptoid;
 1098         crp->crp_opaque = tc;
 1099 
 1100         /* These are passed as-is to the callback. */
 1101         tc->tc_isr = isr;
 1102         tc->tc_spi = sav->spi;
 1103         tc->tc_dst = sav->sah->saidx.dst;
 1104         tc->tc_proto = sav->sah->saidx.proto;
 1105         tc->tc_skip = skip;
 1106         tc->tc_protoff = protoff;
 1107         tc->tc_flags = flags;
 1108         tc->tc_sav = sav;
 1109 
 1110         crypto_dispatch(crp);
 1111         return 0;
 1112 
 1113 bad_tc:
 1114         if (__predict_true(pool_used))
 1115                 pool_cache_put(ah_tdb_crypto_pool_cache, tc);
 1116         else
 1117                 kmem_intr_free(tc, size);
 1118 bad_crp:
 1119         crypto_freereq(crp);
 1120 bad:
 1121         if (m)
 1122                 m_freem(m);
 1123         return error;
 1124 }
 1125 
 1126 /*
 1127  * AH output callback from the crypto driver.
 1128  */
 1129 static void
 1130 ah_output_cb(struct cryptop *crp)
 1131 {
 1132         int skip;
 1133         struct tdb_crypto *tc;
 1134         const struct ipsecrequest *isr;
 1135         struct secasvar *sav;
 1136         struct mbuf *m;
 1137         void *ptr;
 1138         int flags;
 1139         size_t size;
 1140         bool pool_used;
 1141         IPSEC_DECLARE_LOCK_VARIABLE;
 1142 
 1143         KASSERT(crp->crp_opaque != NULL);
 1144         tc = crp->crp_opaque;
 1145         skip = tc->tc_skip;
 1146         ptr = (tc + 1);
 1147         m = crp->crp_buf;
 1148         size = sizeof(*tc) + skip;
 1149         pool_used = size <= ah_pool_item_size;
 1150 
 1151         IPSEC_ACQUIRE_GLOBAL_LOCKS();
 1152 
 1153         isr = tc->tc_isr;
 1154         sav = tc->tc_sav;
 1155 
 1156         /* Check for crypto errors. */
 1157         if (crp->crp_etype) {
 1158                 if (sav->tdb_cryptoid != 0)
 1159                         sav->tdb_cryptoid = crp->crp_sid;
 1160 
 1161                 AH_STATINC(AH_STAT_NOXFORM);
 1162                 DPRINTF("crypto error %d\n", crp->crp_etype);
 1163                 goto bad;
 1164         }
 1165 
 1166         AH_STATINC(AH_STAT_HIST + ah_stats[sav->alg_auth]);
 1167 
 1168         /*
 1169          * Copy original headers (with the new protocol number) back
 1170          * in place.
 1171          */
 1172         m_copyback(m, 0, skip, ptr);
 1173 
 1174         flags = tc->tc_flags;
 1175         /* No longer needed. */
 1176         if (__predict_true(pool_used))
 1177                 pool_cache_put(ah_tdb_crypto_pool_cache, tc);
 1178         else
 1179                 kmem_intr_free(tc, size);
 1180         crypto_freereq(crp);
 1181 
 1182 #ifdef IPSEC_DEBUG
 1183         /* Emulate man-in-the-middle attack when ipsec_integrity is TRUE. */
 1184         if (ipsec_integrity) {
 1185                 int alen;
 1186 
 1187                 /*
 1188                  * Corrupt HMAC if we want to test integrity verification of
 1189                  * the other side.
 1190                  */
 1191                 alen = AUTHSIZE(sav);
 1192                 m_copyback(m, m->m_pkthdr.len - alen, alen, ipseczeroes);
 1193         }
 1194 #endif
 1195 
 1196         /* NB: m is reclaimed by ipsec_process_done. */
 1197         (void)ipsec_process_done(m, isr, sav, flags);
 1198         KEY_SA_UNREF(&sav);
 1199         KEY_SP_UNREF(&isr->sp);
 1200         IPSEC_RELEASE_GLOBAL_LOCKS();
 1201         return;
 1202 bad:
 1203         if (sav)
 1204                 KEY_SA_UNREF(&sav);
 1205         KEY_SP_UNREF(&isr->sp);
 1206         IPSEC_RELEASE_GLOBAL_LOCKS();
 1207         if (m)
 1208                 m_freem(m);
 1209         if (__predict_true(pool_used))
 1210                 pool_cache_put(ah_tdb_crypto_pool_cache, tc);
 1211         else
 1212                 kmem_intr_free(tc, size);
 1213         crypto_freereq(crp);
 1214 }
 1215 
 1216 static struct xformsw ah_xformsw = {
 1217         .xf_type        = XF_AH,
 1218         .xf_flags       = XFT_AUTH,
 1219         .xf_name        = "IPsec AH",
 1220         .xf_init        = ah_init,
 1221         .xf_zeroize     = ah_zeroize,
 1222         .xf_input       = ah_input,
 1223         .xf_output      = ah_output,
 1224         .xf_next        = NULL,
 1225 };
 1226 
 1227 void
 1228 ah_attach(void)
 1229 {
 1230         ahstat_percpu = percpu_alloc(sizeof(uint64_t) * AH_NSTATS);
 1231 
 1232 #define MAXAUTHSIZE(name)                                               \
 1233         if ((auth_hash_ ## name).authsize > ah_max_authsize)            \
 1234                 ah_max_authsize = (auth_hash_ ## name).authsize
 1235 
 1236         ah_max_authsize = 0;
 1237         MAXAUTHSIZE(null);
 1238         MAXAUTHSIZE(md5);
 1239         MAXAUTHSIZE(sha1);
 1240         MAXAUTHSIZE(key_md5);
 1241         MAXAUTHSIZE(key_sha1);
 1242         MAXAUTHSIZE(hmac_md5);
 1243         MAXAUTHSIZE(hmac_sha1);
 1244         MAXAUTHSIZE(hmac_ripemd_160);
 1245         MAXAUTHSIZE(hmac_md5_96);
 1246         MAXAUTHSIZE(hmac_sha1_96);
 1247         MAXAUTHSIZE(hmac_ripemd_160_96);
 1248         MAXAUTHSIZE(hmac_sha2_256);
 1249         MAXAUTHSIZE(hmac_sha2_384);
 1250         MAXAUTHSIZE(hmac_sha2_512);
 1251         MAXAUTHSIZE(aes_xcbc_mac_96);
 1252         MAXAUTHSIZE(gmac_aes_128);
 1253         MAXAUTHSIZE(gmac_aes_192);
 1254         MAXAUTHSIZE(gmac_aes_256);
 1255         IPSECLOG(LOG_DEBUG, "ah_max_authsize=%d\n", ah_max_authsize);
 1256 
 1257 #undef MAXAUTHSIZE
 1258 
 1259         ah_pool_item_size = sizeof(struct tdb_crypto) +
 1260             sizeof(struct ip) + MAX_IPOPTLEN +
 1261             sizeof(struct ah) + sizeof(uint32_t) + ah_max_authsize;
 1262         ah_tdb_crypto_pool_cache = pool_cache_init(ah_pool_item_size,
 1263             coherency_unit, 0, 0, "ah_tdb_crypto", NULL, IPL_SOFTNET,
 1264             NULL, NULL, NULL);
 1265 
 1266         xform_register(&ah_xformsw);
 1267 }
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FreeBSD/Linux Kernel Cross Reference sys/netipsec/xform_ah.c

FreeBSD/Linux Kernel Cross Reference
sys/netipsec/xform_ah.c
