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Annotation of src/sys/netipsec/xform_ipcomp.c, Revision 1.5.4.6

1.5.4.6 ! yamt        1: /*     $NetBSD: xform_ipcomp.c,v 1.5.4.5 2008/01/21 09:47:27 yamt Exp $        */
1.1       jonathan    2: /*     $FreeBSD: src/sys/netipsec/xform_ipcomp.c,v 1.1.4.1 2003/01/24 05:11:36 sam Exp $       */
                      3: /* $OpenBSD: ip_ipcomp.c,v 1.1 2001/07/05 12:08:52 jjbg Exp $ */
                      4:
                      5: /*
                      6:  * Copyright (c) 2001 Jean-Jacques Bernard-Gundol (jj@wabbitt.org)
                      7:  *
                      8:  * Redistribution and use in source and binary forms, with or without
                      9:  * modification, are permitted provided that the following conditions
                     10:  * are met:
                     11:  *
                     12:  * 1. Redistributions of source code must retain the above copyright
                     13:  *   notice, this list of conditions and the following disclaimer.
                     14:  * 2. Redistributions in binary form must reproduce the above copyright
                     15:  *   notice, this list of conditions and the following disclaimer in the
                     16:  *   documentation and/or other materials provided with the distribution.
                     17:  * 3. The name of the author may not be used to endorse or promote products
                     18:  *   derived from this software without specific prior written permission.
                     19:  *
                     20:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
                     21:  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
                     22:  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
                     23:  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
                     24:  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
                     25:  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
                     26:  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
                     27:  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
                     28:  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
                     29:  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
                     30:  */
                     31:
                     32: #include <sys/cdefs.h>
1.5.4.6 ! yamt       33: __KERNEL_RCSID(0, "$NetBSD: xform_ipcomp.c,v 1.5.4.5 2008/01/21 09:47:27 yamt Exp $");
1.1       jonathan   34:
                     35: /* IP payload compression protocol (IPComp), see RFC 2393 */
                     36: #include "opt_inet.h"
1.2       jonathan   37: #ifdef __FreeBSD__
1.1       jonathan   38: #include "opt_inet6.h"
1.2       jonathan   39: #endif
1.1       jonathan   40:
                     41: #include <sys/param.h>
                     42: #include <sys/systm.h>
                     43: #include <sys/mbuf.h>
                     44: #include <sys/socket.h>
                     45: #include <sys/kernel.h>
                     46: #include <sys/protosw.h>
                     47: #include <sys/sysctl.h>
                     48:
                     49: #include <netinet/in.h>
                     50: #include <netinet/in_systm.h>
                     51: #include <netinet/ip.h>
                     52: #include <netinet/ip_var.h>
                     53:
                     54: #include <net/route.h>
                     55: #include <netipsec/ipsec.h>
                     56: #include <netipsec/xform.h>
                     57:
                     58: #ifdef INET6
                     59: #include <netinet/ip6.h>
                     60: #include <netipsec/ipsec6.h>
                     61: #endif
                     62:
                     63: #include <netipsec/ipcomp.h>
                     64: #include <netipsec/ipcomp_var.h>
                     65:
1.4       tls        66: #include <netipsec/key.h>
                     67: #include <netipsec/key_debug.h>
1.1       jonathan   68:
                     69: #include <netipsec/ipsec_osdep.h>
                     70:
                     71: #include <opencrypto/cryptodev.h>
                     72: #include <opencrypto/deflate.h>
                     73: #include <opencrypto/xform.h>
                     74:
1.5.4.2   yamt       75: int    ipcomp_enable = 1;
1.1       jonathan   76: struct ipcompstat ipcompstat;
                     77:
1.4       tls        78: #ifdef __FreeBSD__
1.1       jonathan   79: SYSCTL_DECL(_net_inet_ipcomp);
                     80: SYSCTL_INT(_net_inet_ipcomp, OID_AUTO,
                     81:        ipcomp_enable,  CTLFLAG_RW,     &ipcomp_enable, 0, "");
                     82: SYSCTL_STRUCT(_net_inet_ipcomp, IPSECCTL_STATS,
                     83:        stats,          CTLFLAG_RD,     &ipcompstat,    ipcompstat, "");
1.4       tls        84: #endif /* __FreeBSD__ */
1.1       jonathan   85:
                     86: static int ipcomp_input_cb(struct cryptop *crp);
                     87: static int ipcomp_output_cb(struct cryptop *crp);
                     88:
                     89: struct comp_algo *
                     90: ipcomp_algorithm_lookup(int alg)
                     91: {
                     92:        if (alg >= IPCOMP_ALG_MAX)
                     93:                return NULL;
                     94:        switch (alg) {
                     95:        case SADB_X_CALG_DEFLATE:
                     96:                return &comp_algo_deflate;
                     97:        }
                     98:        return NULL;
                     99: }
                    100:
                    101: /*
                    102:  * ipcomp_init() is called when an CPI is being set up.
                    103:  */
                    104: static int
                    105: ipcomp_init(struct secasvar *sav, struct xformsw *xsp)
                    106: {
                    107:        struct comp_algo *tcomp;
                    108:        struct cryptoini cric;
1.5.4.6 ! yamt      109:        int ses;
1.1       jonathan  110:
                    111:        /* NB: algorithm really comes in alg_enc and not alg_comp! */
                    112:        tcomp = ipcomp_algorithm_lookup(sav->alg_enc);
                    113:        if (tcomp == NULL) {
                    114:                DPRINTF(("ipcomp_init: unsupported compression algorithm %d\n",
                    115:                         sav->alg_comp));
                    116:                return EINVAL;
                    117:        }
                    118:        sav->alg_comp = sav->alg_enc;           /* set for doing histogram */
                    119:        sav->tdb_xform = xsp;
                    120:        sav->tdb_compalgxform = tcomp;
                    121:
                    122:        /* Initialize crypto session */
                    123:        bzero(&cric, sizeof (cric));
                    124:        cric.cri_alg = sav->tdb_compalgxform->type;
                    125:
1.5.4.6 ! yamt      126:        mutex_spin_enter(&crypto_mtx);
        !           127:        ses = crypto_newsession(&sav->tdb_cryptoid, &cric, crypto_support);
        !           128:        mutex_spin_exit(&crypto_mtx);
        !           129:        return ses;
1.1       jonathan  130: }
                    131:
                    132: /*
                    133:  * ipcomp_zeroize() used when IPCA is deleted
                    134:  */
                    135: static int
                    136: ipcomp_zeroize(struct secasvar *sav)
                    137: {
                    138:        int err;
                    139:
1.5.4.6 ! yamt      140:        mutex_spin_enter(&crypto_mtx);
1.1       jonathan  141:        err = crypto_freesession(sav->tdb_cryptoid);
1.5.4.6 ! yamt      142:        mutex_spin_exit(&crypto_mtx);
1.1       jonathan  143:        sav->tdb_cryptoid = 0;
                    144:        return err;
                    145: }
                    146:
                    147: /*
                    148:  * ipcomp_input() gets called to uncompress an input packet
                    149:  */
                    150: static int
                    151: ipcomp_input(struct mbuf *m, struct secasvar *sav, int skip, int protoff)
                    152: {
                    153:        struct tdb_crypto *tc;
                    154:        struct cryptodesc *crdc;
                    155:        struct cryptop *crp;
                    156:        int hlen = IPCOMP_HLENGTH;
                    157:
                    158:        IPSEC_SPLASSERT_SOFTNET("ipcomp_input");
                    159:
                    160:        /* Get crypto descriptors */
                    161:        crp = crypto_getreq(1);
                    162:        if (crp == NULL) {
                    163:                m_freem(m);
                    164:                DPRINTF(("ipcomp_input: no crypto descriptors\n"));
                    165:                ipcompstat.ipcomps_crypto++;
                    166:                return ENOBUFS;
                    167:        }
                    168:        /* Get IPsec-specific opaque pointer */
                    169:        tc = (struct tdb_crypto *) malloc(sizeof (*tc), M_XDATA, M_NOWAIT|M_ZERO);
                    170:        if (tc == NULL) {
                    171:                m_freem(m);
                    172:                crypto_freereq(crp);
                    173:                DPRINTF(("ipcomp_input: cannot allocate tdb_crypto\n"));
                    174:                ipcompstat.ipcomps_crypto++;
                    175:                return ENOBUFS;
                    176:        }
                    177:        crdc = crp->crp_desc;
                    178:
                    179:        crdc->crd_skip = skip + hlen;
                    180:        crdc->crd_len = m->m_pkthdr.len - (skip + hlen);
                    181:        crdc->crd_inject = skip;
                    182:
                    183:        tc->tc_ptr = 0;
                    184:
                    185:        /* Decompression operation */
                    186:        crdc->crd_alg = sav->tdb_compalgxform->type;
                    187:
                    188:        /* Crypto operation descriptor */
                    189:        crp->crp_ilen = m->m_pkthdr.len - (skip + hlen);
                    190:        crp->crp_flags = CRYPTO_F_IMBUF;
1.5.4.3   yamt      191:        crp->crp_buf = m;
1.1       jonathan  192:        crp->crp_callback = ipcomp_input_cb;
                    193:        crp->crp_sid = sav->tdb_cryptoid;
1.5.4.3   yamt      194:        crp->crp_opaque = tc;
1.1       jonathan  195:
                    196:        /* These are passed as-is to the callback */
                    197:        tc->tc_spi = sav->spi;
                    198:        tc->tc_dst = sav->sah->saidx.dst;
                    199:        tc->tc_proto = sav->sah->saidx.proto;
                    200:        tc->tc_protoff = protoff;
                    201:        tc->tc_skip = skip;
                    202:
                    203:        return crypto_dispatch(crp);
                    204: }
                    205:
                    206: #ifdef INET6
                    207: #define        IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, mtag) do {              \
                    208:        if (saidx->dst.sa.sa_family == AF_INET6) {                           \
                    209:                error = ipsec6_common_input_cb(m, sav, skip, protoff, mtag); \
                    210:        } else {                                                             \
                    211:                error = ipsec4_common_input_cb(m, sav, skip, protoff, mtag); \
                    212:        }                                                                    \
                    213: } while (0)
                    214: #else
                    215: #define        IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, mtag)                   \
                    216:        (error = ipsec4_common_input_cb(m, sav, skip, protoff, mtag))
                    217: #endif
                    218:
                    219: /*
                    220:  * IPComp input callback from the crypto driver.
                    221:  */
                    222: static int
                    223: ipcomp_input_cb(struct cryptop *crp)
                    224: {
                    225:        struct cryptodesc *crd;
                    226:        struct tdb_crypto *tc;
                    227:        int skip, protoff;
                    228:        struct mtag *mtag;
                    229:        struct mbuf *m;
                    230:        struct secasvar *sav;
                    231:        struct secasindex *saidx;
                    232:        int s, hlen = IPCOMP_HLENGTH, error, clen;
                    233:        u_int8_t nproto;
1.5.4.3   yamt      234:        void *addr;
                    235:        u_int16_t dport = 0;
                    236:        u_int16_t sport = 0;
                    237: #ifdef IPSEC_NAT_T
                    238:        struct m_tag * tag = NULL;
                    239: #endif
1.1       jonathan  240:
                    241:        crd = crp->crp_desc;
                    242:
                    243:        tc = (struct tdb_crypto *) crp->crp_opaque;
                    244:        IPSEC_ASSERT(tc != NULL, ("ipcomp_input_cb: null opaque crypto data area!"));
                    245:        skip = tc->tc_skip;
                    246:        protoff = tc->tc_protoff;
                    247:        mtag = (struct mtag *) tc->tc_ptr;
                    248:        m = (struct mbuf *) crp->crp_buf;
                    249:
1.5.4.3   yamt      250: #ifdef IPSEC_NAT_T
                    251:        /* find the source port for NAT-T */
                    252:        if ((tag = m_tag_find(m, PACKET_TAG_IPSEC_NAT_T_PORTS, NULL))) {
                    253:                sport = ((u_int16_t *)(tag + 1))[0];
                    254:                dport = ((u_int16_t *)(tag + 1))[1];
                    255:        }
                    256: #endif
                    257:
1.1       jonathan  258:        s = splsoftnet();
                    259:
1.5.4.3   yamt      260:        sav = KEY_ALLOCSA(&tc->tc_dst, tc->tc_proto, tc->tc_spi, sport, dport);
1.1       jonathan  261:        if (sav == NULL) {
                    262:                ipcompstat.ipcomps_notdb++;
                    263:                DPRINTF(("ipcomp_input_cb: SA expired while in crypto\n"));
                    264:                error = ENOBUFS;                /*XXX*/
                    265:                goto bad;
                    266:        }
                    267:
                    268:        saidx = &sav->sah->saidx;
                    269:        IPSEC_ASSERT(saidx->dst.sa.sa_family == AF_INET ||
                    270:                saidx->dst.sa.sa_family == AF_INET6,
                    271:                ("ah_input_cb: unexpected protocol family %u",
                    272:                 saidx->dst.sa.sa_family));
                    273:
                    274:        /* Check for crypto errors */
                    275:        if (crp->crp_etype) {
                    276:                /* Reset the session ID */
                    277:                if (sav->tdb_cryptoid != 0)
                    278:                        sav->tdb_cryptoid = crp->crp_sid;
                    279:
                    280:                if (crp->crp_etype == EAGAIN) {
                    281:                        KEY_FREESAV(&sav);
                    282:                        splx(s);
                    283:                        return crypto_dispatch(crp);
                    284:                }
                    285:
                    286:                ipcompstat.ipcomps_noxform++;
                    287:                DPRINTF(("ipcomp_input_cb: crypto error %d\n", crp->crp_etype));
                    288:                error = crp->crp_etype;
                    289:                goto bad;
                    290:        }
                    291:        /* Shouldn't happen... */
                    292:        if (m == NULL) {
                    293:                ipcompstat.ipcomps_crypto++;
                    294:                DPRINTF(("ipcomp_input_cb: null mbuf returned from crypto\n"));
                    295:                error = EINVAL;
                    296:                goto bad;
                    297:        }
                    298:        ipcompstat.ipcomps_hist[sav->alg_comp]++;
                    299:
                    300:        clen = crp->crp_olen;           /* Length of data after processing */
                    301:
                    302:        /* Release the crypto descriptors */
                    303:        free(tc, M_XDATA), tc = NULL;
                    304:        crypto_freereq(crp), crp = NULL;
                    305:
                    306:        /* In case it's not done already, adjust the size of the mbuf chain */
                    307:        m->m_pkthdr.len = clen + hlen + skip;
                    308:
                    309:        if (m->m_len < skip + hlen && (m = m_pullup(m, skip + hlen)) == 0) {
                    310:                ipcompstat.ipcomps_hdrops++;            /*XXX*/
                    311:                DPRINTF(("ipcomp_input_cb: m_pullup failed\n"));
                    312:                error = EINVAL;                         /*XXX*/
                    313:                goto bad;
                    314:        }
                    315:
                    316:        /* Keep the next protocol field */
1.5.4.4   yamt      317:        addr = (uint8_t*) mtod(m, struct ip *) + skip;
1.1       jonathan  318:        nproto = ((struct ipcomp *) addr)->comp_nxt;
                    319:
                    320:        /* Remove the IPCOMP header */
                    321:        error = m_striphdr(m, skip, hlen);
                    322:        if (error) {
                    323:                ipcompstat.ipcomps_hdrops++;
                    324:                DPRINTF(("ipcomp_input_cb: bad mbuf chain, IPCA %s/%08lx\n",
                    325:                         ipsec_address(&sav->sah->saidx.dst),
                    326:                         (u_long) ntohl(sav->spi)));
                    327:                goto bad;
                    328:        }
                    329:
                    330:        /* Restore the Next Protocol field */
                    331:        m_copyback(m, protoff, sizeof (u_int8_t), (u_int8_t *) &nproto);
                    332:
                    333:        IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, NULL);
                    334:
                    335:        KEY_FREESAV(&sav);
                    336:        splx(s);
                    337:        return error;
                    338: bad:
                    339:        if (sav)
                    340:                KEY_FREESAV(&sav);
                    341:        splx(s);
                    342:        if (m)
                    343:                m_freem(m);
                    344:        if (tc != NULL)
                    345:                free(tc, M_XDATA);
                    346:        if (crp)
                    347:                crypto_freereq(crp);
                    348:        return error;
                    349: }
                    350:
                    351: /*
                    352:  * IPComp output routine, called by ipsec[46]_process_packet()
                    353:  */
                    354: static int
                    355: ipcomp_output(
1.5.4.1   yamt      356:     struct mbuf *m,
                    357:     struct ipsecrequest *isr,
                    358:     struct mbuf **mp,
                    359:     int skip,
                    360:     int protoff
1.1       jonathan  361: )
                    362: {
                    363:        struct secasvar *sav;
                    364:        struct comp_algo *ipcompx;
1.5.4.2   yamt      365:        int error, ralen, hlen, maxpacketsize;
1.1       jonathan  366:        struct cryptodesc *crdc;
                    367:        struct cryptop *crp;
                    368:        struct tdb_crypto *tc;
                    369:
                    370:        IPSEC_SPLASSERT_SOFTNET("ipcomp_output");
                    371:        sav = isr->sav;
                    372:        IPSEC_ASSERT(sav != NULL, ("ipcomp_output: null SA"));
                    373:        ipcompx = sav->tdb_compalgxform;
                    374:        IPSEC_ASSERT(ipcompx != NULL, ("ipcomp_output: null compression xform"));
                    375:
                    376:        ralen = m->m_pkthdr.len - skip; /* Raw payload length before comp. */
1.5.4.2   yamt      377:
                    378:     /* Don't process the packet if it is too short */
                    379:        if (ralen < ipcompx->minlen) {
                    380:                ipcompstat.ipcomps_minlen++;
                    381:                return ipsec_process_done(m,isr);
                    382:        }
                    383:
1.1       jonathan  384:        hlen = IPCOMP_HLENGTH;
                    385:
                    386:        ipcompstat.ipcomps_output++;
                    387:
                    388:        /* Check for maximum packet size violations. */
                    389:        switch (sav->sah->saidx.dst.sa.sa_family) {
                    390: #ifdef INET
                    391:        case AF_INET:
                    392:                maxpacketsize =  IP_MAXPACKET;
                    393:                break;
                    394: #endif /* INET */
                    395: #ifdef INET6
                    396:        case AF_INET6:
                    397:                maxpacketsize =  IPV6_MAXPACKET;
                    398:                break;
                    399: #endif /* INET6 */
                    400:        default:
                    401:                ipcompstat.ipcomps_nopf++;
                    402:                DPRINTF(("ipcomp_output: unknown/unsupported protocol family %d"
1.5       perry     403:                    ", IPCA %s/%08lx\n",
1.1       jonathan  404:                    sav->sah->saidx.dst.sa.sa_family,
                    405:                    ipsec_address(&sav->sah->saidx.dst),
                    406:                    (u_long) ntohl(sav->spi)));
                    407:                error = EPFNOSUPPORT;
                    408:                goto bad;
                    409:        }
                    410:        if (skip + hlen + ralen > maxpacketsize) {
                    411:                ipcompstat.ipcomps_toobig++;
                    412:                DPRINTF(("ipcomp_output: packet in IPCA %s/%08lx got too big "
                    413:                    "(len %u, max len %u)\n",
                    414:                    ipsec_address(&sav->sah->saidx.dst),
                    415:                    (u_long) ntohl(sav->spi),
                    416:                    skip + hlen + ralen, maxpacketsize));
                    417:                error = EMSGSIZE;
                    418:                goto bad;
                    419:        }
                    420:
                    421:        /* Update the counters */
                    422:        ipcompstat.ipcomps_obytes += m->m_pkthdr.len - skip;
                    423:
                    424:        m = m_clone(m);
                    425:        if (m == NULL) {
                    426:                ipcompstat.ipcomps_hdrops++;
1.5       perry     427:                DPRINTF(("ipcomp_output: cannot clone mbuf chain, IPCA %s/%08lx\n",
1.1       jonathan  428:                    ipsec_address(&sav->sah->saidx.dst),
                    429:                    (u_long) ntohl(sav->spi)));
                    430:                error = ENOBUFS;
                    431:                goto bad;
                    432:        }
                    433:
                    434:        /* Ok now, we can pass to the crypto processing */
                    435:
                    436:        /* Get crypto descriptors */
                    437:        crp = crypto_getreq(1);
                    438:        if (crp == NULL) {
                    439:                ipcompstat.ipcomps_crypto++;
                    440:                DPRINTF(("ipcomp_output: failed to acquire crypto descriptor\n"));
                    441:                error = ENOBUFS;
                    442:                goto bad;
                    443:        }
                    444:        crdc = crp->crp_desc;
                    445:
                    446:        /* Compression descriptor */
1.5.4.2   yamt      447:        crdc->crd_skip = skip;
                    448:        crdc->crd_len = m->m_pkthdr.len - skip;
1.1       jonathan  449:        crdc->crd_flags = CRD_F_COMP;
1.5.4.2   yamt      450:        crdc->crd_inject = skip;
1.1       jonathan  451:
                    452:        /* Compression operation */
                    453:        crdc->crd_alg = ipcompx->type;
                    454:
                    455:        /* IPsec-specific opaque crypto info */
                    456:        tc = (struct tdb_crypto *) malloc(sizeof(struct tdb_crypto),
                    457:                M_XDATA, M_NOWAIT|M_ZERO);
                    458:        if (tc == NULL) {
                    459:                ipcompstat.ipcomps_crypto++;
                    460:                DPRINTF(("ipcomp_output: failed to allocate tdb_crypto\n"));
                    461:                crypto_freereq(crp);
                    462:                error = ENOBUFS;
                    463:                goto bad;
                    464:        }
                    465:
                    466:        tc->tc_isr = isr;
                    467:        tc->tc_spi = sav->spi;
                    468:        tc->tc_dst = sav->sah->saidx.dst;
                    469:        tc->tc_proto = sav->sah->saidx.proto;
1.5.4.2   yamt      470:        tc->tc_skip = skip;
                    471:        tc->tc_protoff = protoff;
1.1       jonathan  472:
                    473:        /* Crypto operation descriptor */
                    474:        crp->crp_ilen = m->m_pkthdr.len;        /* Total input length */
                    475:        crp->crp_flags = CRYPTO_F_IMBUF;
1.5.4.3   yamt      476:        crp->crp_buf = m;
1.1       jonathan  477:        crp->crp_callback = ipcomp_output_cb;
1.5.4.3   yamt      478:        crp->crp_opaque = tc;
1.1       jonathan  479:        crp->crp_sid = sav->tdb_cryptoid;
                    480:
                    481:        return crypto_dispatch(crp);
                    482: bad:
                    483:        if (m)
                    484:                m_freem(m);
                    485:        return (error);
                    486: }
                    487:
                    488: /*
                    489:  * IPComp output callback from the crypto driver.
                    490:  */
                    491: static int
                    492: ipcomp_output_cb(struct cryptop *crp)
                    493: {
                    494:        struct tdb_crypto *tc;
                    495:        struct ipsecrequest *isr;
                    496:        struct secasvar *sav;
1.5.4.2   yamt      497:        struct mbuf *m, *mo;
                    498:        int s, error, skip, rlen, roff;
                    499:        u_int8_t prot;
                    500:        u_int16_t cpi;
                    501:        struct ipcomp * ipcomp;
                    502:
1.1       jonathan  503:
                    504:        tc = (struct tdb_crypto *) crp->crp_opaque;
                    505:        IPSEC_ASSERT(tc != NULL, ("ipcomp_output_cb: null opaque data area!"));
                    506:        m = (struct mbuf *) crp->crp_buf;
                    507:        skip = tc->tc_skip;
                    508:        rlen = crp->crp_ilen - skip;
                    509:
                    510:        s = splsoftnet();
                    511:
                    512:        isr = tc->tc_isr;
1.5.4.3   yamt      513:        sav = KEY_ALLOCSA(&tc->tc_dst, tc->tc_proto, tc->tc_spi, 0, 0);
1.1       jonathan  514:        if (sav == NULL) {
                    515:                ipcompstat.ipcomps_notdb++;
                    516:                DPRINTF(("ipcomp_output_cb: SA expired while in crypto\n"));
                    517:                error = ENOBUFS;                /*XXX*/
                    518:                goto bad;
                    519:        }
                    520:        IPSEC_ASSERT(isr->sav == sav, ("ipcomp_output_cb: SA changed\n"));
                    521:
                    522:        /* Check for crypto errors */
                    523:        if (crp->crp_etype) {
                    524:                /* Reset session ID */
                    525:                if (sav->tdb_cryptoid != 0)
                    526:                        sav->tdb_cryptoid = crp->crp_sid;
                    527:
                    528:                if (crp->crp_etype == EAGAIN) {
                    529:                        KEY_FREESAV(&sav);
                    530:                        splx(s);
                    531:                        return crypto_dispatch(crp);
                    532:                }
                    533:                ipcompstat.ipcomps_noxform++;
                    534:                DPRINTF(("ipcomp_output_cb: crypto error %d\n", crp->crp_etype));
                    535:                error = crp->crp_etype;
                    536:                goto bad;
                    537:        }
                    538:        /* Shouldn't happen... */
                    539:        if (m == NULL) {
                    540:                ipcompstat.ipcomps_crypto++;
                    541:                DPRINTF(("ipcomp_output_cb: bogus return buffer from crypto\n"));
                    542:                error = EINVAL;
                    543:                goto bad;
                    544:        }
                    545:        ipcompstat.ipcomps_hist[sav->alg_comp]++;
                    546:
                    547:        if (rlen > crp->crp_olen) {
1.5.4.2   yamt      548:                /* Inject IPCOMP header */
                    549:                mo = m_makespace(m, skip, IPCOMP_HLENGTH, &roff);
                    550:                if (mo == NULL) {
                    551:                        ipcompstat.ipcomps_wrap++;
                    552:                        DPRINTF(("ipcomp_output: failed to inject IPCOMP header for "
                    553:                                         "IPCA %s/%08lx\n",
                    554:                                                ipsec_address(&sav->sah->saidx.dst),
                    555:                                                (u_long) ntohl(sav->spi)));
                    556:                        error = ENOBUFS;
                    557:                        goto bad;
                    558:                }
1.5.4.3   yamt      559:                ipcomp = (struct ipcomp *)(mtod(mo, char *) + roff);
1.5.4.2   yamt      560:
                    561:                /* Initialize the IPCOMP header */
                    562:                /* XXX alignment always correct? */
                    563:                switch (sav->sah->saidx.dst.sa.sa_family) {
                    564: #ifdef INET
                    565:                case AF_INET:
                    566:                        ipcomp->comp_nxt = mtod(m, struct ip *)->ip_p;
                    567:                         break;
                    568: #endif /* INET */
                    569: #ifdef INET6
                    570:                case AF_INET6:
                    571:                        ipcomp->comp_nxt = mtod(m, struct ip6_hdr *)->ip6_nxt;
                    572:                break;
                    573: #endif
                    574:                }
                    575:                ipcomp->comp_flags = 0;
                    576:
                    577:                if ((sav->flags & SADB_X_EXT_RAWCPI) == 0)
                    578:                         cpi = sav->alg_enc;
                    579:                else
                    580:                        cpi = ntohl(sav->spi) & 0xffff;
                    581:                ipcomp->comp_cpi = htons(cpi);
                    582:
                    583:                /* Fix Next Protocol in IPv4/IPv6 header */
                    584:                prot = IPPROTO_IPCOMP;
                    585:                m_copyback(m, tc->tc_protoff, sizeof(u_int8_t), (u_char *)&prot);
                    586:
1.1       jonathan  587:                /* Adjust the length in the IP header */
                    588:                switch (sav->sah->saidx.dst.sa.sa_family) {
                    589: #ifdef INET
                    590:                case AF_INET:
                    591:                        mtod(m, struct ip *)->ip_len = htons(m->m_pkthdr.len);
                    592:                        break;
                    593: #endif /* INET */
                    594: #ifdef INET6
                    595:                case AF_INET6:
                    596:                        mtod(m, struct ip6_hdr *)->ip6_plen =
                    597:                                htons(m->m_pkthdr.len) - sizeof(struct ip6_hdr);
                    598:                        break;
                    599: #endif /* INET6 */
                    600:                default:
                    601:                        ipcompstat.ipcomps_nopf++;
                    602:                        DPRINTF(("ipcomp_output: unknown/unsupported protocol "
1.5       perry     603:                            "family %d, IPCA %s/%08lx\n",
1.1       jonathan  604:                            sav->sah->saidx.dst.sa.sa_family,
1.5       perry     605:                            ipsec_address(&sav->sah->saidx.dst),
1.1       jonathan  606:                            (u_long) ntohl(sav->spi)));
                    607:                        error = EPFNOSUPPORT;
                    608:                        goto bad;
                    609:                }
                    610:        } else {
                    611:                /* compression was useless, we have lost time */
1.5.4.5   yamt      612:                ipcompstat.ipcomps_uselesscomp++;
                    613:                DPRINTF(("ipcomp_output_cb: compression was useless : initial size was %d"
                    614:                                        "and compressed size is %d\n", rlen, crp->crp_olen));
1.1       jonathan  615:        }
                    616:
1.5.4.5   yamt      617:
1.1       jonathan  618:        /* Release the crypto descriptor */
                    619:        free(tc, M_XDATA);
                    620:        crypto_freereq(crp);
                    621:
                    622:        /* NB: m is reclaimed by ipsec_process_done. */
                    623:        error = ipsec_process_done(m, isr);
                    624:        KEY_FREESAV(&sav);
                    625:        splx(s);
                    626:        return error;
                    627: bad:
                    628:        if (sav)
                    629:                KEY_FREESAV(&sav);
                    630:        splx(s);
                    631:        if (m)
                    632:                m_freem(m);
                    633:        free(tc, M_XDATA);
                    634:        crypto_freereq(crp);
                    635:        return error;
                    636: }
                    637:
                    638: static struct xformsw ipcomp_xformsw = {
                    639:        XF_IPCOMP,              XFT_COMP,               "IPcomp",
                    640:        ipcomp_init,            ipcomp_zeroize,         ipcomp_input,
1.5.4.1   yamt      641:        ipcomp_output,
                    642:        NULL,
1.1       jonathan  643: };
                    644:
                    645: INITFN void
                    646: ipcomp_attach(void)
                    647: {
                    648:        xform_register(&ipcomp_xformsw);
                    649: }
                    650:
                    651: #ifdef __FreeBSD__
                    652: SYSINIT(ipcomp_xform_init, SI_SUB_DRIVERS, SI_ORDER_FIRST, ipcomp_attach, NULL)
1.4       tls       653: #endif /* __FreeBSD__ */

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