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Annotation of src/sys/netipsec/xform_ipcomp.c, Revision 1.5

1.5     ! perry       1: /*     $NetBSD: xform_ipcomp.c,v 1.4 2003/10/06 22:05:15 tls 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     ! perry      33: __KERNEL_RCSID(0, "$NetBSD: xform_ipcomp.c,v 1.4 2003/10/06 22:05:15 tls 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:
                     75: int    ipcomp_enable = 0;
                     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;
                    109:
                    110:        /* NB: algorithm really comes in alg_enc and not alg_comp! */
                    111:        tcomp = ipcomp_algorithm_lookup(sav->alg_enc);
                    112:        if (tcomp == NULL) {
                    113:                DPRINTF(("ipcomp_init: unsupported compression algorithm %d\n",
                    114:                         sav->alg_comp));
                    115:                return EINVAL;
                    116:        }
                    117:        sav->alg_comp = sav->alg_enc;           /* set for doing histogram */
                    118:        sav->tdb_xform = xsp;
                    119:        sav->tdb_compalgxform = tcomp;
                    120:
                    121:        /* Initialize crypto session */
                    122:        bzero(&cric, sizeof (cric));
                    123:        cric.cri_alg = sav->tdb_compalgxform->type;
                    124:
                    125:        return crypto_newsession(&sav->tdb_cryptoid, &cric, crypto_support);
                    126: }
                    127:
                    128: /*
                    129:  * ipcomp_zeroize() used when IPCA is deleted
                    130:  */
                    131: static int
                    132: ipcomp_zeroize(struct secasvar *sav)
                    133: {
                    134:        int err;
                    135:
                    136:        err = crypto_freesession(sav->tdb_cryptoid);
                    137:        sav->tdb_cryptoid = 0;
                    138:        return err;
                    139: }
                    140:
                    141: /*
                    142:  * ipcomp_input() gets called to uncompress an input packet
                    143:  */
                    144: static int
                    145: ipcomp_input(struct mbuf *m, struct secasvar *sav, int skip, int protoff)
                    146: {
                    147:        struct tdb_crypto *tc;
                    148:        struct cryptodesc *crdc;
                    149:        struct cryptop *crp;
                    150:        int hlen = IPCOMP_HLENGTH;
                    151:
                    152:        IPSEC_SPLASSERT_SOFTNET("ipcomp_input");
                    153:
                    154:        /* Get crypto descriptors */
                    155:        crp = crypto_getreq(1);
                    156:        if (crp == NULL) {
                    157:                m_freem(m);
                    158:                DPRINTF(("ipcomp_input: no crypto descriptors\n"));
                    159:                ipcompstat.ipcomps_crypto++;
                    160:                return ENOBUFS;
                    161:        }
                    162:        /* Get IPsec-specific opaque pointer */
                    163:        tc = (struct tdb_crypto *) malloc(sizeof (*tc), M_XDATA, M_NOWAIT|M_ZERO);
                    164:        if (tc == NULL) {
                    165:                m_freem(m);
                    166:                crypto_freereq(crp);
                    167:                DPRINTF(("ipcomp_input: cannot allocate tdb_crypto\n"));
                    168:                ipcompstat.ipcomps_crypto++;
                    169:                return ENOBUFS;
                    170:        }
                    171:        crdc = crp->crp_desc;
                    172:
                    173:        crdc->crd_skip = skip + hlen;
                    174:        crdc->crd_len = m->m_pkthdr.len - (skip + hlen);
                    175:        crdc->crd_inject = skip;
                    176:
                    177:        tc->tc_ptr = 0;
                    178:
                    179:        /* Decompression operation */
                    180:        crdc->crd_alg = sav->tdb_compalgxform->type;
                    181:
                    182:        /* Crypto operation descriptor */
                    183:        crp->crp_ilen = m->m_pkthdr.len - (skip + hlen);
                    184:        crp->crp_flags = CRYPTO_F_IMBUF;
                    185:        crp->crp_buf = (caddr_t) m;
                    186:        crp->crp_callback = ipcomp_input_cb;
                    187:        crp->crp_sid = sav->tdb_cryptoid;
                    188:        crp->crp_opaque = (caddr_t) tc;
                    189:
                    190:        /* These are passed as-is to the callback */
                    191:        tc->tc_spi = sav->spi;
                    192:        tc->tc_dst = sav->sah->saidx.dst;
                    193:        tc->tc_proto = sav->sah->saidx.proto;
                    194:        tc->tc_protoff = protoff;
                    195:        tc->tc_skip = skip;
                    196:
                    197:        return crypto_dispatch(crp);
                    198: }
                    199:
                    200: #ifdef INET6
                    201: #define        IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, mtag) do {              \
                    202:        if (saidx->dst.sa.sa_family == AF_INET6) {                           \
                    203:                error = ipsec6_common_input_cb(m, sav, skip, protoff, mtag); \
                    204:        } else {                                                             \
                    205:                error = ipsec4_common_input_cb(m, sav, skip, protoff, mtag); \
                    206:        }                                                                    \
                    207: } while (0)
                    208: #else
                    209: #define        IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, mtag)                   \
                    210:        (error = ipsec4_common_input_cb(m, sav, skip, protoff, mtag))
                    211: #endif
                    212:
                    213: /*
                    214:  * IPComp input callback from the crypto driver.
                    215:  */
                    216: static int
                    217: ipcomp_input_cb(struct cryptop *crp)
                    218: {
                    219:        struct cryptodesc *crd;
                    220:        struct tdb_crypto *tc;
                    221:        int skip, protoff;
                    222:        struct mtag *mtag;
                    223:        struct mbuf *m;
                    224:        struct secasvar *sav;
                    225:        struct secasindex *saidx;
                    226:        int s, hlen = IPCOMP_HLENGTH, error, clen;
                    227:        u_int8_t nproto;
                    228:        caddr_t addr;
                    229:
                    230:        crd = crp->crp_desc;
                    231:
                    232:        tc = (struct tdb_crypto *) crp->crp_opaque;
                    233:        IPSEC_ASSERT(tc != NULL, ("ipcomp_input_cb: null opaque crypto data area!"));
                    234:        skip = tc->tc_skip;
                    235:        protoff = tc->tc_protoff;
                    236:        mtag = (struct mtag *) tc->tc_ptr;
                    237:        m = (struct mbuf *) crp->crp_buf;
                    238:
                    239:        s = splsoftnet();
                    240:
                    241:        sav = KEY_ALLOCSA(&tc->tc_dst, tc->tc_proto, tc->tc_spi);
                    242:        if (sav == NULL) {
                    243:                ipcompstat.ipcomps_notdb++;
                    244:                DPRINTF(("ipcomp_input_cb: SA expired while in crypto\n"));
                    245:                error = ENOBUFS;                /*XXX*/
                    246:                goto bad;
                    247:        }
                    248:
                    249:        saidx = &sav->sah->saidx;
                    250:        IPSEC_ASSERT(saidx->dst.sa.sa_family == AF_INET ||
                    251:                saidx->dst.sa.sa_family == AF_INET6,
                    252:                ("ah_input_cb: unexpected protocol family %u",
                    253:                 saidx->dst.sa.sa_family));
                    254:
                    255:        /* Check for crypto errors */
                    256:        if (crp->crp_etype) {
                    257:                /* Reset the session ID */
                    258:                if (sav->tdb_cryptoid != 0)
                    259:                        sav->tdb_cryptoid = crp->crp_sid;
                    260:
                    261:                if (crp->crp_etype == EAGAIN) {
                    262:                        KEY_FREESAV(&sav);
                    263:                        splx(s);
                    264:                        return crypto_dispatch(crp);
                    265:                }
                    266:
                    267:                ipcompstat.ipcomps_noxform++;
                    268:                DPRINTF(("ipcomp_input_cb: crypto error %d\n", crp->crp_etype));
                    269:                error = crp->crp_etype;
                    270:                goto bad;
                    271:        }
                    272:        /* Shouldn't happen... */
                    273:        if (m == NULL) {
                    274:                ipcompstat.ipcomps_crypto++;
                    275:                DPRINTF(("ipcomp_input_cb: null mbuf returned from crypto\n"));
                    276:                error = EINVAL;
                    277:                goto bad;
                    278:        }
                    279:        ipcompstat.ipcomps_hist[sav->alg_comp]++;
                    280:
                    281:        clen = crp->crp_olen;           /* Length of data after processing */
                    282:
                    283:        /* Release the crypto descriptors */
                    284:        free(tc, M_XDATA), tc = NULL;
                    285:        crypto_freereq(crp), crp = NULL;
                    286:
                    287:        /* In case it's not done already, adjust the size of the mbuf chain */
                    288:        m->m_pkthdr.len = clen + hlen + skip;
                    289:
                    290:        if (m->m_len < skip + hlen && (m = m_pullup(m, skip + hlen)) == 0) {
                    291:                ipcompstat.ipcomps_hdrops++;            /*XXX*/
                    292:                DPRINTF(("ipcomp_input_cb: m_pullup failed\n"));
                    293:                error = EINVAL;                         /*XXX*/
                    294:                goto bad;
                    295:        }
                    296:
                    297:        /* Keep the next protocol field */
                    298:        addr = (caddr_t) mtod(m, struct ip *) + skip;
                    299:        nproto = ((struct ipcomp *) addr)->comp_nxt;
                    300:
                    301:        /* Remove the IPCOMP header */
                    302:        error = m_striphdr(m, skip, hlen);
                    303:        if (error) {
                    304:                ipcompstat.ipcomps_hdrops++;
                    305:                DPRINTF(("ipcomp_input_cb: bad mbuf chain, IPCA %s/%08lx\n",
                    306:                         ipsec_address(&sav->sah->saidx.dst),
                    307:                         (u_long) ntohl(sav->spi)));
                    308:                goto bad;
                    309:        }
                    310:
                    311:        /* Restore the Next Protocol field */
                    312:        m_copyback(m, protoff, sizeof (u_int8_t), (u_int8_t *) &nproto);
                    313:
                    314:        IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, NULL);
                    315:
                    316:        KEY_FREESAV(&sav);
                    317:        splx(s);
                    318:        return error;
                    319: bad:
                    320:        if (sav)
                    321:                KEY_FREESAV(&sav);
                    322:        splx(s);
                    323:        if (m)
                    324:                m_freem(m);
                    325:        if (tc != NULL)
                    326:                free(tc, M_XDATA);
                    327:        if (crp)
                    328:                crypto_freereq(crp);
                    329:        return error;
                    330: }
                    331:
                    332: /*
                    333:  * IPComp output routine, called by ipsec[46]_process_packet()
                    334:  */
                    335: static int
                    336: ipcomp_output(
                    337:        struct mbuf *m,
                    338:        struct ipsecrequest *isr,
                    339:        struct mbuf **mp,
                    340:        int skip,
                    341:        int protoff
                    342: )
                    343: {
                    344:        struct secasvar *sav;
                    345:        struct comp_algo *ipcompx;
                    346:        int error, ralen, hlen, maxpacketsize, roff;
                    347:        u_int8_t prot;
                    348:        struct cryptodesc *crdc;
                    349:        struct cryptop *crp;
                    350:        struct tdb_crypto *tc;
                    351:        struct mbuf *mo;
                    352:        struct ipcomp *ipcomp;
                    353:
                    354:        IPSEC_SPLASSERT_SOFTNET("ipcomp_output");
                    355:        sav = isr->sav;
                    356:        IPSEC_ASSERT(sav != NULL, ("ipcomp_output: null SA"));
                    357:        ipcompx = sav->tdb_compalgxform;
                    358:        IPSEC_ASSERT(ipcompx != NULL, ("ipcomp_output: null compression xform"));
                    359:
                    360:        ralen = m->m_pkthdr.len - skip; /* Raw payload length before comp. */
                    361:        hlen = IPCOMP_HLENGTH;
                    362:
                    363:        ipcompstat.ipcomps_output++;
                    364:
                    365:        /* Check for maximum packet size violations. */
                    366:        switch (sav->sah->saidx.dst.sa.sa_family) {
                    367: #ifdef INET
                    368:        case AF_INET:
                    369:                maxpacketsize =  IP_MAXPACKET;
                    370:                break;
                    371: #endif /* INET */
                    372: #ifdef INET6
                    373:        case AF_INET6:
                    374:                maxpacketsize =  IPV6_MAXPACKET;
                    375:                break;
                    376: #endif /* INET6 */
                    377:        default:
                    378:                ipcompstat.ipcomps_nopf++;
                    379:                DPRINTF(("ipcomp_output: unknown/unsupported protocol family %d"
1.5     ! perry     380:                    ", IPCA %s/%08lx\n",
1.1       jonathan  381:                    sav->sah->saidx.dst.sa.sa_family,
                    382:                    ipsec_address(&sav->sah->saidx.dst),
                    383:                    (u_long) ntohl(sav->spi)));
                    384:                error = EPFNOSUPPORT;
                    385:                goto bad;
                    386:        }
                    387:        if (skip + hlen + ralen > maxpacketsize) {
                    388:                ipcompstat.ipcomps_toobig++;
                    389:                DPRINTF(("ipcomp_output: packet in IPCA %s/%08lx got too big "
                    390:                    "(len %u, max len %u)\n",
                    391:                    ipsec_address(&sav->sah->saidx.dst),
                    392:                    (u_long) ntohl(sav->spi),
                    393:                    skip + hlen + ralen, maxpacketsize));
                    394:                error = EMSGSIZE;
                    395:                goto bad;
                    396:        }
                    397:
                    398:        /* Update the counters */
                    399:        ipcompstat.ipcomps_obytes += m->m_pkthdr.len - skip;
                    400:
                    401:        m = m_clone(m);
                    402:        if (m == NULL) {
                    403:                ipcompstat.ipcomps_hdrops++;
1.5     ! perry     404:                DPRINTF(("ipcomp_output: cannot clone mbuf chain, IPCA %s/%08lx\n",
1.1       jonathan  405:                    ipsec_address(&sav->sah->saidx.dst),
                    406:                    (u_long) ntohl(sav->spi)));
                    407:                error = ENOBUFS;
                    408:                goto bad;
                    409:        }
                    410:
                    411:        /* Inject IPCOMP header */
                    412:        mo = m_makespace(m, skip, hlen, &roff);
                    413:        if (mo == NULL) {
                    414:                ipcompstat.ipcomps_wrap++;
                    415:                DPRINTF(("ipcomp_output: failed to inject IPCOMP header for "
                    416:                    "IPCA %s/%08lx\n",
                    417:                    ipsec_address(&sav->sah->saidx.dst),
                    418:                    (u_long) ntohl(sav->spi)));
                    419:                error = ENOBUFS;
                    420:                goto bad;
                    421:        }
                    422:        ipcomp = (struct ipcomp *)(mtod(mo, caddr_t) + roff);
                    423:
                    424:        /* Initialize the IPCOMP header */
                    425:        /* XXX alignment always correct? */
                    426:        switch (sav->sah->saidx.dst.sa.sa_family) {
                    427: #ifdef INET
                    428:        case AF_INET:
                    429:                ipcomp->comp_nxt = mtod(m, struct ip *)->ip_p;
                    430:                break;
                    431: #endif /* INET */
                    432: #ifdef INET6
                    433:        case AF_INET6:
                    434:                ipcomp->comp_nxt = mtod(m, struct ip6_hdr *)->ip6_nxt;
                    435:                break;
                    436: #endif
                    437:        }
                    438:        ipcomp->comp_flags = 0;
                    439:        ipcomp->comp_cpi = htons((u_int16_t) ntohl(sav->spi));
                    440:
                    441:        /* Fix Next Protocol in IPv4/IPv6 header */
                    442:        prot = IPPROTO_IPCOMP;
                    443:        m_copyback(m, protoff, sizeof(u_int8_t), (u_char *) &prot);
                    444:
                    445:        /* Ok now, we can pass to the crypto processing */
                    446:
                    447:        /* Get crypto descriptors */
                    448:        crp = crypto_getreq(1);
                    449:        if (crp == NULL) {
                    450:                ipcompstat.ipcomps_crypto++;
                    451:                DPRINTF(("ipcomp_output: failed to acquire crypto descriptor\n"));
                    452:                error = ENOBUFS;
                    453:                goto bad;
                    454:        }
                    455:        crdc = crp->crp_desc;
                    456:
                    457:        /* Compression descriptor */
                    458:        crdc->crd_skip = skip + hlen;
                    459:        crdc->crd_len = m->m_pkthdr.len - (skip + hlen);
                    460:        crdc->crd_flags = CRD_F_COMP;
                    461:        crdc->crd_inject = skip + hlen;
                    462:
                    463:        /* Compression operation */
                    464:        crdc->crd_alg = ipcompx->type;
                    465:
                    466:        /* IPsec-specific opaque crypto info */
                    467:        tc = (struct tdb_crypto *) malloc(sizeof(struct tdb_crypto),
                    468:                M_XDATA, M_NOWAIT|M_ZERO);
                    469:        if (tc == NULL) {
                    470:                ipcompstat.ipcomps_crypto++;
                    471:                DPRINTF(("ipcomp_output: failed to allocate tdb_crypto\n"));
                    472:                crypto_freereq(crp);
                    473:                error = ENOBUFS;
                    474:                goto bad;
                    475:        }
                    476:
                    477:        tc->tc_isr = isr;
                    478:        tc->tc_spi = sav->spi;
                    479:        tc->tc_dst = sav->sah->saidx.dst;
                    480:        tc->tc_proto = sav->sah->saidx.proto;
                    481:        tc->tc_skip = skip + hlen;
                    482:
                    483:        /* Crypto operation descriptor */
                    484:        crp->crp_ilen = m->m_pkthdr.len;        /* Total input length */
                    485:        crp->crp_flags = CRYPTO_F_IMBUF;
                    486:        crp->crp_buf = (caddr_t) m;
                    487:        crp->crp_callback = ipcomp_output_cb;
                    488:        crp->crp_opaque = (caddr_t) tc;
                    489:        crp->crp_sid = sav->tdb_cryptoid;
                    490:
                    491:        return crypto_dispatch(crp);
                    492: bad:
                    493:        if (m)
                    494:                m_freem(m);
                    495:        return (error);
                    496: }
                    497:
                    498: /*
                    499:  * IPComp output callback from the crypto driver.
                    500:  */
                    501: static int
                    502: ipcomp_output_cb(struct cryptop *crp)
                    503: {
                    504:        struct tdb_crypto *tc;
                    505:        struct ipsecrequest *isr;
                    506:        struct secasvar *sav;
                    507:        struct mbuf *m;
                    508:        int s, error, skip, rlen;
                    509:
                    510:        tc = (struct tdb_crypto *) crp->crp_opaque;
                    511:        IPSEC_ASSERT(tc != NULL, ("ipcomp_output_cb: null opaque data area!"));
                    512:        m = (struct mbuf *) crp->crp_buf;
                    513:        skip = tc->tc_skip;
                    514:        rlen = crp->crp_ilen - skip;
                    515:
                    516:        s = splsoftnet();
                    517:
                    518:        isr = tc->tc_isr;
                    519:        sav = KEY_ALLOCSA(&tc->tc_dst, tc->tc_proto, tc->tc_spi);
                    520:        if (sav == NULL) {
                    521:                ipcompstat.ipcomps_notdb++;
                    522:                DPRINTF(("ipcomp_output_cb: SA expired while in crypto\n"));
                    523:                error = ENOBUFS;                /*XXX*/
                    524:                goto bad;
                    525:        }
                    526:        IPSEC_ASSERT(isr->sav == sav, ("ipcomp_output_cb: SA changed\n"));
                    527:
                    528:        /* Check for crypto errors */
                    529:        if (crp->crp_etype) {
                    530:                /* Reset session ID */
                    531:                if (sav->tdb_cryptoid != 0)
                    532:                        sav->tdb_cryptoid = crp->crp_sid;
                    533:
                    534:                if (crp->crp_etype == EAGAIN) {
                    535:                        KEY_FREESAV(&sav);
                    536:                        splx(s);
                    537:                        return crypto_dispatch(crp);
                    538:                }
                    539:                ipcompstat.ipcomps_noxform++;
                    540:                DPRINTF(("ipcomp_output_cb: crypto error %d\n", crp->crp_etype));
                    541:                error = crp->crp_etype;
                    542:                goto bad;
                    543:        }
                    544:        /* Shouldn't happen... */
                    545:        if (m == NULL) {
                    546:                ipcompstat.ipcomps_crypto++;
                    547:                DPRINTF(("ipcomp_output_cb: bogus return buffer from crypto\n"));
                    548:                error = EINVAL;
                    549:                goto bad;
                    550:        }
                    551:        ipcompstat.ipcomps_hist[sav->alg_comp]++;
                    552:
                    553:        if (rlen > crp->crp_olen) {
                    554:                /* Adjust the length in the IP header */
                    555:                switch (sav->sah->saidx.dst.sa.sa_family) {
                    556: #ifdef INET
                    557:                case AF_INET:
                    558:                        mtod(m, struct ip *)->ip_len = htons(m->m_pkthdr.len);
                    559:                        break;
                    560: #endif /* INET */
                    561: #ifdef INET6
                    562:                case AF_INET6:
                    563:                        mtod(m, struct ip6_hdr *)->ip6_plen =
                    564:                                htons(m->m_pkthdr.len) - sizeof(struct ip6_hdr);
                    565:                        break;
                    566: #endif /* INET6 */
                    567:                default:
                    568:                        ipcompstat.ipcomps_nopf++;
                    569:                        DPRINTF(("ipcomp_output: unknown/unsupported protocol "
1.5     ! perry     570:                            "family %d, IPCA %s/%08lx\n",
1.1       jonathan  571:                            sav->sah->saidx.dst.sa.sa_family,
1.5     ! perry     572:                            ipsec_address(&sav->sah->saidx.dst),
1.1       jonathan  573:                            (u_long) ntohl(sav->spi)));
                    574:                        error = EPFNOSUPPORT;
                    575:                        goto bad;
                    576:                }
                    577:        } else {
                    578:                /* compression was useless, we have lost time */
                    579:                /* XXX add statistic */
                    580:        }
                    581:
                    582:        /* Release the crypto descriptor */
                    583:        free(tc, M_XDATA);
                    584:        crypto_freereq(crp);
                    585:
                    586:        /* NB: m is reclaimed by ipsec_process_done. */
                    587:        error = ipsec_process_done(m, isr);
                    588:        KEY_FREESAV(&sav);
                    589:        splx(s);
                    590:        return error;
                    591: bad:
                    592:        if (sav)
                    593:                KEY_FREESAV(&sav);
                    594:        splx(s);
                    595:        if (m)
                    596:                m_freem(m);
                    597:        free(tc, M_XDATA);
                    598:        crypto_freereq(crp);
                    599:        return error;
                    600: }
                    601:
                    602: static struct xformsw ipcomp_xformsw = {
                    603:        XF_IPCOMP,              XFT_COMP,               "IPcomp",
                    604:        ipcomp_init,            ipcomp_zeroize,         ipcomp_input,
                    605:        ipcomp_output
                    606: };
                    607:
                    608: INITFN void
                    609: ipcomp_attach(void)
                    610: {
                    611:        xform_register(&ipcomp_xformsw);
                    612: }
                    613:
                    614: #ifdef __FreeBSD__
                    615: SYSINIT(ipcomp_xform_init, SI_SUB_DRIVERS, SI_ORDER_FIRST, ipcomp_attach, NULL)
1.4       tls       616: #endif /* __FreeBSD__ */

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