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Annotation of src/sys/netinet/udp_usrreq.c, Revision 1.103.2.10

1.103.2.10! skrll       1: /*     $NetBSD: udp_usrreq.c,v 1.103.2.9 2005/04/01 14:31:50 skrll Exp $       */
1.48      itojun      2:
                      3: /*
                      4:  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
                      5:  * All rights reserved.
1.94      itojun      6:  *
1.48      itojun      7:  * Redistribution and use in source and binary forms, with or without
                      8:  * modification, are permitted provided that the following conditions
                      9:  * are met:
                     10:  * 1. Redistributions of source code must retain the above copyright
                     11:  *    notice, this list of conditions and the following disclaimer.
                     12:  * 2. Redistributions in binary form must reproduce the above copyright
                     13:  *    notice, this list of conditions and the following disclaimer in the
                     14:  *    documentation and/or other materials provided with the distribution.
                     15:  * 3. Neither the name of the project nor the names of its contributors
                     16:  *    may be used to endorse or promote products derived from this software
                     17:  *    without specific prior written permission.
1.94      itojun     18:  *
1.48      itojun     19:  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
                     20:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     21:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     22:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
                     23:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     24:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     25:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     26:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     27:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     28:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     29:  * SUCH DAMAGE.
                     30:  */
1.14      cgd        31:
1.1       cgd        32: /*
1.44      thorpej    33:  * Copyright (c) 1982, 1986, 1988, 1990, 1993, 1995
1.13      mycroft    34:  *     The Regents of the University of California.  All rights reserved.
1.1       cgd        35:  *
                     36:  * Redistribution and use in source and binary forms, with or without
                     37:  * modification, are permitted provided that the following conditions
                     38:  * are met:
                     39:  * 1. Redistributions of source code must retain the above copyright
                     40:  *    notice, this list of conditions and the following disclaimer.
                     41:  * 2. Redistributions in binary form must reproduce the above copyright
                     42:  *    notice, this list of conditions and the following disclaimer in the
                     43:  *    documentation and/or other materials provided with the distribution.
1.103.2.2  skrll      44:  * 3. Neither the name of the University nor the names of its contributors
1.1       cgd        45:  *    may be used to endorse or promote products derived from this software
                     46:  *    without specific prior written permission.
                     47:  *
                     48:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     49:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     50:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     51:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     52:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     53:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     54:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     55:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     56:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     57:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     58:  * SUCH DAMAGE.
                     59:  *
1.44      thorpej    60:  *     @(#)udp_usrreq.c        8.6 (Berkeley) 5/23/95
1.1       cgd        61:  */
1.91      lukem      62:
                     63: #include <sys/cdefs.h>
1.103.2.10! skrll      64: __KERNEL_RCSID(0, "$NetBSD: udp_usrreq.c,v 1.103.2.9 2005/04/01 14:31:50 skrll Exp $");
1.50      thorpej    65:
1.77      soda       66: #include "opt_inet.h"
1.50      thorpej    67: #include "opt_ipsec.h"
1.78      thorpej    68: #include "opt_inet_csum.h"
1.64      ws         69: #include "opt_ipkdb.h"
1.101     martin     70: #include "opt_mbuftrace.h"
1.1       cgd        71:
1.5       mycroft    72: #include <sys/param.h>
                     73: #include <sys/malloc.h>
                     74: #include <sys/mbuf.h>
                     75: #include <sys/protosw.h>
                     76: #include <sys/socket.h>
                     77: #include <sys/socketvar.h>
1.13      mycroft    78: #include <sys/errno.h>
1.5       mycroft    79: #include <sys/stat.h>
1.27      christos   80: #include <sys/systm.h>
                     81: #include <sys/proc.h>
1.53      itojun     82: #include <sys/domain.h>
1.27      christos   83: #include <sys/sysctl.h>
1.1       cgd        84:
1.5       mycroft    85: #include <net/if.h>
                     86: #include <net/route.h>
1.1       cgd        87:
1.5       mycroft    88: #include <netinet/in.h>
                     89: #include <netinet/in_systm.h>
1.15      cgd        90: #include <netinet/in_var.h>
1.5       mycroft    91: #include <netinet/ip.h>
                     92: #include <netinet/in_pcb.h>
                     93: #include <netinet/ip_var.h>
                     94: #include <netinet/ip_icmp.h>
                     95: #include <netinet/udp.h>
                     96: #include <netinet/udp_var.h>
1.1       cgd        97:
1.103.2.7  skrll      98: #ifdef IPSEC_NAT_T
                     99: #include <netinet6/ipsec.h>
                    100: #include <netinet6/esp.h>
                    101: #endif
                    102:
1.53      itojun    103: #ifdef INET6
                    104: #include <netinet/ip6.h>
                    105: #include <netinet/icmp6.h>
                    106: #include <netinet6/ip6_var.h>
                    107: #include <netinet6/in6_pcb.h>
                    108: #include <netinet6/udp6_var.h>
                    109: #endif
                    110:
                    111: #ifndef INET6
                    112: /* always need ip6.h for IP6_EXTHDR_GET */
                    113: #include <netinet/ip6.h>
                    114: #endif
                    115:
1.76      itojun    116: #include "faith.h"
                    117: #if defined(NFAITH) && NFAITH > 0
                    118: #include <net/if_faith.h>
                    119: #endif
                    120:
1.27      christos  121: #include <machine/stdarg.h>
                    122:
1.103.2.2  skrll     123: #ifdef FAST_IPSEC
                    124: #include <netipsec/ipsec.h>
                    125: #include <netipsec/ipsec_var.h>                        /* XXX ipsecstat namespace */
                    126: #ifdef INET6
                    127: #include <netipsec/ipsec6.h>
                    128: #endif
                    129: #endif /* FAST_IPSEC*/
                    130:
1.48      itojun    131: #ifdef IPSEC
                    132: #include <netinet6/ipsec.h>
                    133: #include <netkey/key.h>
                    134: #endif /*IPSEC*/
                    135:
1.64      ws        136: #ifdef IPKDB
                    137: #include <ipkdb/ipkdb.h>
                    138: #endif
                    139:
1.8       mycroft   140: /*
                    141:  * UDP protocol implementation.
                    142:  * Per RFC 768, August, 1980.
                    143:  */
                    144: #ifndef        COMPAT_42
                    145: int    udpcksum = 1;
                    146: #else
                    147: int    udpcksum = 0;           /* XXX */
                    148: #endif
1.103.2.6  skrll     149: int    udp_do_loopback_cksum = 0;
1.93      matt      150:
                    151: struct inpcbtable udbtable;
                    152: struct udpstat udpstat;
1.8       mycroft   153:
1.72      itojun    154: #ifdef INET
1.103.2.7  skrll     155: #ifdef IPSEC_NAT_T
                    156: static int udp4_espinudp (struct mbuf *, int, struct sockaddr *,
                    157:        struct socket *);
                    158: #endif
1.103.2.2  skrll     159: static void udp4_sendup (struct mbuf *, int, struct sockaddr *,
                    160:        struct socket *);
                    161: static int udp4_realinput (struct sockaddr_in *, struct sockaddr_in *,
                    162:        struct mbuf *, int);
1.103.2.6  skrll     163: static int udp4_input_checksum(struct mbuf *, const struct udphdr *, int, int);
1.72      itojun    164: #endif
1.53      itojun    165: #ifdef INET6
1.103.2.2  skrll     166: static void udp6_sendup (struct mbuf *, int, struct sockaddr *,
                    167:        struct socket *);
                    168: static int udp6_realinput (int, struct sockaddr_in6 *,
                    169:        struct sockaddr_in6 *, struct mbuf *, int);
1.103.2.6  skrll     170: static int udp6_input_checksum(struct mbuf *, const struct udphdr *, int, int);
1.53      itojun    171: #endif
1.72      itojun    172: #ifdef INET
1.103.2.2  skrll     173: static void udp_notify (struct inpcb *, int);
1.72      itojun    174: #endif
1.7       mycroft   175:
1.26      mycroft   176: #ifndef UDBHASHSIZE
                    177: #define        UDBHASHSIZE     128
                    178: #endif
                    179: int    udbhashsize = UDBHASHSIZE;
                    180:
1.98      matt      181: #ifdef MBUFTRACE
                    182: struct mowner udp_mowner = { "udp" };
                    183: struct mowner udp_rx_mowner = { "udp", "rx" };
                    184: struct mowner udp_tx_mowner = { "udp", "tx" };
                    185: #endif
                    186:
1.78      thorpej   187: #ifdef UDP_CSUM_COUNTERS
                    188: #include <sys/device.h>
                    189:
1.103.2.10! skrll     190: #if defined(INET)
1.78      thorpej   191: struct evcnt udp_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    192:     NULL, "udp", "hwcsum bad");
                    193: struct evcnt udp_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    194:     NULL, "udp", "hwcsum ok");
                    195: struct evcnt udp_hwcsum_data = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    196:     NULL, "udp", "hwcsum data");
                    197: struct evcnt udp_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    198:     NULL, "udp", "swcsum");
                    199:
1.103.2.2  skrll     200: EVCNT_ATTACH_STATIC(udp_hwcsum_bad);
                    201: EVCNT_ATTACH_STATIC(udp_hwcsum_ok);
                    202: EVCNT_ATTACH_STATIC(udp_hwcsum_data);
                    203: EVCNT_ATTACH_STATIC(udp_swcsum);
1.103.2.10! skrll     204: #endif /* defined(INET) */
        !           205:
        !           206: #if defined(INET6)
        !           207: struct evcnt udp6_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
        !           208:     NULL, "udp6", "hwcsum bad");
        !           209: struct evcnt udp6_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
        !           210:     NULL, "udp6", "hwcsum ok");
        !           211: struct evcnt udp6_hwcsum_data = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
        !           212:     NULL, "udp6", "hwcsum data");
        !           213: struct evcnt udp6_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
        !           214:     NULL, "udp6", "swcsum");
        !           215:
        !           216: EVCNT_ATTACH_STATIC(udp6_hwcsum_bad);
        !           217: EVCNT_ATTACH_STATIC(udp6_hwcsum_ok);
        !           218: EVCNT_ATTACH_STATIC(udp6_hwcsum_data);
        !           219: EVCNT_ATTACH_STATIC(udp6_swcsum);
        !           220: #endif /* defined(INET6) */
        !           221:
        !           222: #define        UDP_CSUM_COUNTER_INCR(ev)       (ev)->ev_count++
1.103.2.2  skrll     223:
1.78      thorpej   224: #else
                    225:
                    226: #define        UDP_CSUM_COUNTER_INCR(ev)       /* nothing */
                    227:
                    228: #endif /* UDP_CSUM_COUNTERS */
                    229:
1.7       mycroft   230: void
1.103.2.2  skrll     231: udp_init(void)
1.1       cgd       232: {
1.18      mycroft   233:
1.35      mycroft   234:        in_pcbinit(&udbtable, udbhashsize, udbhashsize);
1.98      matt      235:
                    236:        MOWNER_ATTACH(&udp_tx_mowner);
                    237:        MOWNER_ATTACH(&udp_rx_mowner);
                    238:        MOWNER_ATTACH(&udp_mowner);
1.1       cgd       239: }
                    240:
1.103.2.6  skrll     241: /*
                    242:  * Checksum extended UDP header and data.
                    243:  */
                    244:
                    245: int
                    246: udp_input_checksum(int af, struct mbuf *m, const struct udphdr *uh,
                    247:     int iphlen, int len)
                    248: {
                    249:
                    250:        switch (af) {
1.72      itojun    251: #ifdef INET
1.103.2.6  skrll     252:        case AF_INET:
                    253:                return udp4_input_checksum(m, uh, iphlen, len);
                    254: #endif
                    255: #ifdef INET6
                    256:        case AF_INET6:
                    257:                return udp6_input_checksum(m, uh, iphlen, len);
                    258: #endif
                    259:        }
                    260: #ifdef DIAGNOSTIC
                    261:        panic("udp_input_checksum: unknown af %d", af);
                    262: #endif
                    263:        /* NOTREACHED */
                    264:        return -1;
                    265: }
                    266:
                    267: #ifdef INET
                    268:
                    269: /*
                    270:  * Checksum extended UDP header and data.
                    271:  */
                    272:
                    273: static int
                    274: udp4_input_checksum(struct mbuf *m, const struct udphdr *uh,
                    275:     int iphlen, int len)
                    276: {
                    277:
                    278:        /*
                    279:         * XXX it's better to record and check if this mbuf is
                    280:         * already checked.
                    281:         */
                    282:
                    283:        if (uh->uh_sum == 0)
                    284:                return 0;
                    285:
                    286:        switch (m->m_pkthdr.csum_flags &
                    287:            ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_UDPv4) |
                    288:            M_CSUM_TCP_UDP_BAD | M_CSUM_DATA)) {
                    289:        case M_CSUM_UDPv4|M_CSUM_TCP_UDP_BAD:
                    290:                UDP_CSUM_COUNTER_INCR(&udp_hwcsum_bad);
                    291:                goto badcsum;
                    292:
                    293:        case M_CSUM_UDPv4|M_CSUM_DATA: {
                    294:                u_int32_t hw_csum = m->m_pkthdr.csum_data;
                    295:
                    296:                UDP_CSUM_COUNTER_INCR(&udp_hwcsum_data);
                    297:                if (m->m_pkthdr.csum_flags & M_CSUM_NO_PSEUDOHDR) {
                    298:                        const struct ip *ip =
                    299:                            mtod(m, const struct ip *);
                    300:
                    301:                        hw_csum = in_cksum_phdr(ip->ip_src.s_addr,
                    302:                            ip->ip_dst.s_addr,
                    303:                            htons(hw_csum + len + IPPROTO_UDP));
                    304:                }
                    305:                if ((hw_csum ^ 0xffff) != 0)
                    306:                        goto badcsum;
                    307:                break;
                    308:        }
                    309:
                    310:        case M_CSUM_UDPv4:
                    311:                /* Checksum was okay. */
                    312:                UDP_CSUM_COUNTER_INCR(&udp_hwcsum_ok);
                    313:                break;
                    314:
                    315:        default:
                    316:                /*
                    317:                 * Need to compute it ourselves.  Maybe skip checksum
                    318:                 * on loopback interfaces.
                    319:                 */
                    320:                if (__predict_true(!(m->m_pkthdr.rcvif->if_flags &
                    321:                                     IFF_LOOPBACK) ||
                    322:                                   udp_do_loopback_cksum)) {
                    323:                        UDP_CSUM_COUNTER_INCR(&udp_swcsum);
                    324:                        if (in4_cksum(m, IPPROTO_UDP, iphlen, len) != 0)
                    325:                                goto badcsum;
                    326:                }
                    327:                break;
                    328:        }
                    329:
                    330:        return 0;
                    331:
                    332: badcsum:
                    333:        udpstat.udps_badsum++;
                    334:        return -1;
                    335: }
                    336:
1.7       mycroft   337: void
1.27      christos  338: udp_input(struct mbuf *m, ...)
1.1       cgd       339: {
1.53      itojun    340:        va_list ap;
                    341:        struct sockaddr_in src, dst;
                    342:        struct ip *ip;
                    343:        struct udphdr *uh;
1.97      simonb    344:        int iphlen;
1.53      itojun    345:        int len;
                    346:        int n;
1.96      itojun    347:        u_int16_t ip_len;
1.53      itojun    348:
                    349:        va_start(ap, m);
                    350:        iphlen = va_arg(ap, int);
1.97      simonb    351:        (void)va_arg(ap, int);          /* ignore value, advance ap */
1.53      itojun    352:        va_end(ap);
                    353:
1.98      matt      354:        MCLAIM(m, &udp_rx_mowner);
1.53      itojun    355:        udpstat.udps_ipackets++;
                    356:
                    357:        /*
                    358:         * Get IP and UDP header together in first mbuf.
                    359:         */
                    360:        ip = mtod(m, struct ip *);
                    361:        IP6_EXTHDR_GET(uh, struct udphdr *, m, iphlen, sizeof(struct udphdr));
                    362:        if (uh == NULL) {
                    363:                udpstat.udps_hdrops++;
                    364:                return;
                    365:        }
1.95      thorpej   366:        KASSERT(UDP_HDR_ALIGNED_P(uh));
1.53      itojun    367:
1.57      itojun    368:        /* destination port of 0 is illegal, based on RFC768. */
                    369:        if (uh->uh_dport == 0)
                    370:                goto bad;
                    371:
1.53      itojun    372:        /*
                    373:         * Make mbuf data length reflect UDP length.
                    374:         * If not enough data to reflect UDP length, drop.
                    375:         */
1.96      itojun    376:        ip_len = ntohs(ip->ip_len);
1.53      itojun    377:        len = ntohs((u_int16_t)uh->uh_ulen);
1.96      itojun    378:        if (ip_len != iphlen + len) {
                    379:                if (ip_len < iphlen + len || len < sizeof(struct udphdr)) {
1.53      itojun    380:                        udpstat.udps_badlen++;
                    381:                        goto bad;
                    382:                }
1.96      itojun    383:                m_adj(m, iphlen + len - ip_len);
1.53      itojun    384:        }
                    385:
                    386:        /*
                    387:         * Checksum extended UDP header and data.
                    388:         */
1.103.2.6  skrll     389:        if (udp4_input_checksum(m, uh, iphlen, len))
                    390:                goto badcsum;
1.53      itojun    391:
                    392:        /* construct source and dst sockaddrs. */
                    393:        bzero(&src, sizeof(src));
                    394:        src.sin_family = AF_INET;
                    395:        src.sin_len = sizeof(struct sockaddr_in);
                    396:        bcopy(&ip->ip_src, &src.sin_addr, sizeof(src.sin_addr));
                    397:        src.sin_port = uh->uh_sport;
                    398:        bzero(&dst, sizeof(dst));
                    399:        dst.sin_family = AF_INET;
                    400:        dst.sin_len = sizeof(struct sockaddr_in);
                    401:        bcopy(&ip->ip_dst, &dst.sin_addr, sizeof(dst.sin_addr));
                    402:        dst.sin_port = uh->uh_dport;
                    403:
                    404:        n = udp4_realinput(&src, &dst, m, iphlen);
                    405: #ifdef INET6
                    406:        if (IN_MULTICAST(ip->ip_dst.s_addr) || n == 0) {
                    407:                struct sockaddr_in6 src6, dst6;
                    408:
                    409:                bzero(&src6, sizeof(src6));
                    410:                src6.sin6_family = AF_INET6;
                    411:                src6.sin6_len = sizeof(struct sockaddr_in6);
                    412:                src6.sin6_addr.s6_addr[10] = src6.sin6_addr.s6_addr[11] = 0xff;
                    413:                bcopy(&ip->ip_src, &src6.sin6_addr.s6_addr[12],
                    414:                        sizeof(ip->ip_src));
                    415:                src6.sin6_port = uh->uh_sport;
                    416:                bzero(&dst6, sizeof(dst6));
                    417:                dst6.sin6_family = AF_INET6;
                    418:                dst6.sin6_len = sizeof(struct sockaddr_in6);
                    419:                dst6.sin6_addr.s6_addr[10] = dst6.sin6_addr.s6_addr[11] = 0xff;
                    420:                bcopy(&ip->ip_dst, &dst6.sin6_addr.s6_addr[12],
                    421:                        sizeof(ip->ip_dst));
                    422:                dst6.sin6_port = uh->uh_dport;
                    423:
                    424:                n += udp6_realinput(AF_INET, &src6, &dst6, m, iphlen);
                    425:        }
                    426: #endif
                    427:
                    428:        if (n == 0) {
                    429:                if (m->m_flags & (M_BCAST | M_MCAST)) {
                    430:                        udpstat.udps_noportbcast++;
                    431:                        goto bad;
                    432:                }
1.61      itojun    433:                udpstat.udps_noport++;
1.64      ws        434: #ifdef IPKDB
1.53      itojun    435:                if (checkipkdb(&ip->ip_src, uh->uh_sport, uh->uh_dport,
                    436:                                m, iphlen + sizeof(struct udphdr),
                    437:                                m->m_pkthdr.len - iphlen - sizeof(struct udphdr))) {
                    438:                        /*
                    439:                         * It was a debugger connect packet,
                    440:                         * just drop it now
                    441:                         */
                    442:                        goto bad;
                    443:                }
                    444: #endif
                    445:                icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0);
                    446:                m = NULL;
                    447:        }
                    448:
                    449: bad:
                    450:        if (m)
                    451:                m_freem(m);
1.78      thorpej   452:        return;
                    453:
                    454: badcsum:
                    455:        m_freem(m);
1.53      itojun    456: }
1.72      itojun    457: #endif
1.53      itojun    458:
                    459: #ifdef INET6
1.103.2.6  skrll     460: static int
                    461: udp6_input_checksum(struct mbuf *m, const struct udphdr *uh, int off, int len)
                    462: {
                    463:
1.103.2.10! skrll     464:        /*
        !           465:         * XXX it's better to record and check if this mbuf is
        !           466:         * already checked.
        !           467:         */
        !           468:
1.103.2.6  skrll     469:        if (__predict_false((m->m_flags & M_LOOP) && !udp_do_loopback_cksum)) {
                    470:                goto good;
                    471:        }
                    472:        if (uh->uh_sum == 0) {
                    473:                udp6stat.udp6s_nosum++;
                    474:                goto bad;
                    475:        }
1.103.2.10! skrll     476:
        !           477:        switch (m->m_pkthdr.csum_flags &
        !           478:            ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_UDPv6) |
        !           479:            M_CSUM_TCP_UDP_BAD | M_CSUM_DATA)) {
        !           480:        case M_CSUM_UDPv6|M_CSUM_TCP_UDP_BAD:
        !           481:                UDP_CSUM_COUNTER_INCR(&udp6_hwcsum_bad);
1.103.2.6  skrll     482:                udp6stat.udp6s_badsum++;
                    483:                goto bad;
1.103.2.10! skrll     484:
        !           485: #if 0 /* notyet */
        !           486:        case M_CSUM_UDPv6|M_CSUM_DATA:
        !           487: #endif
        !           488:
        !           489:        case M_CSUM_UDPv6:
        !           490:                /* Checksum was okay. */
        !           491:                UDP_CSUM_COUNTER_INCR(&udp6_hwcsum_ok);
        !           492:                break;
        !           493:
        !           494:        default:
        !           495:                /*
        !           496:                 * Need to compute it ourselves.  Maybe skip checksum
        !           497:                 * on loopback interfaces.
        !           498:                 */
        !           499:                UDP_CSUM_COUNTER_INCR(&udp6_swcsum);
        !           500:                if (in6_cksum(m, IPPROTO_UDP, off, len) != 0) {
        !           501:                        udp6stat.udp6s_badsum++;
        !           502:                        goto bad;
        !           503:                }
1.103.2.6  skrll     504:        }
                    505:
                    506: good:
                    507:        return 0;
                    508: bad:
                    509:        return -1;
                    510: }
                    511:
1.53      itojun    512: int
1.103.2.2  skrll     513: udp6_input(struct mbuf **mp, int *offp, int proto)
1.53      itojun    514: {
                    515:        struct mbuf *m = *mp;
                    516:        int off = *offp;
                    517:        struct sockaddr_in6 src, dst;
                    518:        struct ip6_hdr *ip6;
                    519:        struct udphdr *uh;
                    520:        u_int32_t plen, ulen;
                    521:
1.76      itojun    522:        ip6 = mtod(m, struct ip6_hdr *);
                    523:
1.53      itojun    524: #if defined(NFAITH) && 0 < NFAITH
1.76      itojun    525:        if (faithprefix(&ip6->ip6_dst)) {
                    526:                /* send icmp6 host unreach? */
                    527:                m_freem(m);
                    528:                return IPPROTO_DONE;
1.53      itojun    529:        }
                    530: #endif
                    531:
                    532:        udp6stat.udp6s_ipackets++;
                    533:
                    534:        /* check for jumbogram is done in ip6_input.  we can trust pkthdr.len */
                    535:        plen = m->m_pkthdr.len - off;
                    536:        IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(struct udphdr));
                    537:        if (uh == NULL) {
                    538:                ip6stat.ip6s_tooshort++;
                    539:                return IPPROTO_DONE;
                    540:        }
1.95      thorpej   541:        KASSERT(UDP_HDR_ALIGNED_P(uh));
1.53      itojun    542:        ulen = ntohs((u_short)uh->uh_ulen);
1.69      itojun    543:        /*
                    544:         * RFC2675 section 4: jumbograms will have 0 in the UDP header field,
                    545:         * iff payload length > 0xffff.
                    546:         */
1.53      itojun    547:        if (ulen == 0 && plen > 0xffff)
                    548:                ulen = plen;
                    549:
                    550:        if (plen != ulen) {
                    551:                udp6stat.udp6s_badlen++;
1.54      itojun    552:                goto bad;
                    553:        }
                    554:
1.57      itojun    555:        /* destination port of 0 is illegal, based on RFC768. */
                    556:        if (uh->uh_dport == 0)
                    557:                goto bad;
                    558:
1.54      itojun    559:        /* Be proactive about malicious use of IPv4 mapped address */
                    560:        if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
                    561:            IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
                    562:                /* XXX stat */
1.53      itojun    563:                goto bad;
                    564:        }
                    565:
                    566:        /*
1.103.2.5  skrll     567:         * Checksum extended UDP header and data.  Maybe skip checksum
                    568:         * on loopback interfaces.
1.53      itojun    569:         */
1.103.2.6  skrll     570:        if (udp6_input_checksum(m, uh, off, ulen))
                    571:                goto bad;
1.53      itojun    572:
                    573:        /*
                    574:         * Construct source and dst sockaddrs.
                    575:         * Note that ifindex (s6_addr16[1]) is already filled.
                    576:         */
                    577:        bzero(&src, sizeof(src));
                    578:        src.sin6_family = AF_INET6;
                    579:        src.sin6_len = sizeof(struct sockaddr_in6);
1.69      itojun    580:        /* KAME hack: recover scopeid */
                    581:        (void)in6_recoverscope(&src, &ip6->ip6_src, m->m_pkthdr.rcvif);
1.53      itojun    582:        src.sin6_port = uh->uh_sport;
                    583:        bzero(&dst, sizeof(dst));
                    584:        dst.sin6_family = AF_INET6;
                    585:        dst.sin6_len = sizeof(struct sockaddr_in6);
1.69      itojun    586:        /* KAME hack: recover scopeid */
                    587:        (void)in6_recoverscope(&dst, &ip6->ip6_dst, m->m_pkthdr.rcvif);
1.53      itojun    588:        dst.sin6_port = uh->uh_dport;
                    589:
                    590:        if (udp6_realinput(AF_INET6, &src, &dst, m, off) == 0) {
                    591:                if (m->m_flags & M_MCAST) {
                    592:                        udp6stat.udp6s_noportmcast++;
                    593:                        goto bad;
                    594:                }
1.61      itojun    595:                udp6stat.udp6s_noport++;
1.53      itojun    596:                icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
                    597:                m = NULL;
                    598:        }
                    599:
                    600: bad:
                    601:        if (m)
                    602:                m_freem(m);
                    603:        return IPPROTO_DONE;
                    604: }
                    605: #endif
                    606:
1.72      itojun    607: #ifdef INET
1.53      itojun    608: static void
1.103.2.2  skrll     609: udp4_sendup(struct mbuf *m, int off /* offset of data portion */,
                    610:        struct sockaddr *src, struct socket *so)
1.53      itojun    611: {
                    612:        struct mbuf *opts = NULL;
                    613:        struct mbuf *n;
                    614:        struct inpcb *inp = NULL;
                    615:
                    616:        if (!so)
                    617:                return;
                    618:        switch (so->so_proto->pr_domain->dom_family) {
                    619:        case AF_INET:
                    620:                inp = sotoinpcb(so);
                    621:                break;
                    622: #ifdef INET6
                    623:        case AF_INET6:
                    624:                break;
                    625: #endif
                    626:        default:
                    627:                return;
                    628:        }
                    629:
1.103.2.2  skrll     630: #if defined(IPSEC) || defined(FAST_IPSEC)
1.53      itojun    631:        /* check AH/ESP integrity. */
                    632:        if (so != NULL && ipsec4_in_reject_so(m, so)) {
                    633:                ipsecstat.in_polvio++;
1.103.2.2  skrll     634:                if ((n = m_copy(m, 0, M_COPYALL)) != NULL)
                    635:                        icmp_error(n, ICMP_UNREACH, ICMP_UNREACH_ADMIN_PROHIBIT,
                    636:                            0, 0);
1.53      itojun    637:                return;
                    638:        }
                    639: #endif /*IPSEC*/
                    640:
                    641:        if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
                    642:                if (inp && (inp->inp_flags & INP_CONTROLOPTS
                    643:                         || so->so_options & SO_TIMESTAMP)) {
                    644:                        struct ip *ip = mtod(n, struct ip *);
                    645:                        ip_savecontrol(inp, &opts, ip, n);
                    646:                }
                    647:
                    648:                m_adj(n, off);
                    649:                if (sbappendaddr(&so->so_rcv, src, n,
                    650:                                opts) == 0) {
                    651:                        m_freem(n);
                    652:                        if (opts)
                    653:                                m_freem(opts);
1.103.2.3  skrll     654:                        so->so_rcv.sb_overflowed++;
1.81      enami     655:                        udpstat.udps_fullsock++;
1.53      itojun    656:                } else
                    657:                        sorwakeup(so);
                    658:        }
                    659: }
1.72      itojun    660: #endif
1.53      itojun    661:
                    662: #ifdef INET6
                    663: static void
1.103.2.2  skrll     664: udp6_sendup(struct mbuf *m, int off /* offset of data portion */,
                    665:        struct sockaddr *src, struct socket *so)
1.53      itojun    666: {
                    667:        struct mbuf *opts = NULL;
                    668:        struct mbuf *n;
                    669:        struct in6pcb *in6p = NULL;
                    670:
                    671:        if (!so)
                    672:                return;
                    673:        if (so->so_proto->pr_domain->dom_family != AF_INET6)
                    674:                return;
                    675:        in6p = sotoin6pcb(so);
                    676:
1.103.2.2  skrll     677: #if defined(IPSEC) || defined(FAST_IPSEC)
1.53      itojun    678:        /* check AH/ESP integrity. */
                    679:        if (so != NULL && ipsec6_in_reject_so(m, so)) {
                    680:                ipsec6stat.in_polvio++;
1.103.2.2  skrll     681:                if ((n = m_copy(m, 0, M_COPYALL)) != NULL)
                    682:                        icmp6_error(n, ICMP6_DST_UNREACH,
                    683:                            ICMP6_DST_UNREACH_ADMIN, 0);
1.53      itojun    684:                return;
                    685:        }
                    686: #endif /*IPSEC*/
                    687:
                    688:        if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
                    689:                if (in6p && (in6p->in6p_flags & IN6P_CONTROLOPTS
                    690:                          || in6p->in6p_socket->so_options & SO_TIMESTAMP)) {
                    691:                        struct ip6_hdr *ip6 = mtod(n, struct ip6_hdr *);
                    692:                        ip6_savecontrol(in6p, &opts, ip6, n);
                    693:                }
                    694:
                    695:                m_adj(n, off);
                    696:                if (sbappendaddr(&so->so_rcv, src, n, opts) == 0) {
                    697:                        m_freem(n);
                    698:                        if (opts)
                    699:                                m_freem(opts);
1.103.2.3  skrll     700:                        so->so_rcv.sb_overflowed++;
1.53      itojun    701:                        udp6stat.udp6s_fullsock++;
                    702:                } else
                    703:                        sorwakeup(so);
                    704:        }
                    705: }
                    706: #endif
                    707:
1.72      itojun    708: #ifdef INET
1.53      itojun    709: static int
1.103.2.2  skrll     710: udp4_realinput(struct sockaddr_in *src, struct sockaddr_in *dst,
                    711:        struct mbuf *m, int off /* offset of udphdr */)
1.53      itojun    712: {
                    713:        u_int16_t *sport, *dport;
                    714:        int rcvcnt;
                    715:        struct in_addr *src4, *dst4;
1.103.2.2  skrll     716:        struct inpcb_hdr *inph;
1.53      itojun    717:        struct inpcb *inp;
                    718:
                    719:        rcvcnt = 0;
                    720:        off += sizeof(struct udphdr);   /* now, offset of payload */
                    721:
                    722:        if (src->sin_family != AF_INET || dst->sin_family != AF_INET)
                    723:                goto bad;
                    724:
                    725:        src4 = &src->sin_addr;
                    726:        sport = &src->sin_port;
                    727:        dst4 = &dst->sin_addr;
                    728:        dport = &dst->sin_port;
                    729:
1.73      itojun    730:        if (IN_MULTICAST(dst4->s_addr) ||
1.53      itojun    731:            in_broadcast(*dst4, m->m_pkthdr.rcvif)) {
                    732:                /*
                    733:                 * Deliver a multicast or broadcast datagram to *all* sockets
                    734:                 * for which the local and remote addresses and ports match
                    735:                 * those of the incoming datagram.  This allows more than
                    736:                 * one process to receive multi/broadcasts on the same port.
                    737:                 * (This really ought to be done for unicast datagrams as
                    738:                 * well, but that would cause problems with existing
                    739:                 * applications that open both address-specific sockets and
                    740:                 * a wildcard socket listening to the same port -- they would
                    741:                 * end up receiving duplicates of every unicast datagram.
                    742:                 * Those applications open the multiple sockets to overcome an
                    743:                 * inadequacy of the UDP socket interface, but for backwards
                    744:                 * compatibility we avoid the problem here rather than
                    745:                 * fixing the interface.  Maybe 4.5BSD will remedy this?)
                    746:                 */
                    747:
                    748:                /*
1.92      itojun    749:                 * KAME note: traditionally we dropped udpiphdr from mbuf here.
1.71      itojun    750:                 * we need udpiphdr for IPsec processing so we do that later.
1.53      itojun    751:                 */
                    752:                /*
                    753:                 * Locate pcb(s) for datagram.
                    754:                 */
1.103.2.2  skrll     755:                CIRCLEQ_FOREACH(inph, &udbtable.inpt_queue, inph_queue) {
                    756:                        inp = (struct inpcb *)inph;
                    757:                        if (inp->inp_af != AF_INET)
                    758:                                continue;
                    759:
1.53      itojun    760:                        if (inp->inp_lport != *dport)
                    761:                                continue;
                    762:                        if (!in_nullhost(inp->inp_laddr)) {
                    763:                                if (!in_hosteq(inp->inp_laddr, *dst4))
                    764:                                        continue;
                    765:                        }
                    766:                        if (!in_nullhost(inp->inp_faddr)) {
                    767:                                if (!in_hosteq(inp->inp_faddr, *src4) ||
                    768:                                    inp->inp_fport != *sport)
                    769:                                        continue;
                    770:                        }
                    771:
                    772:                        udp4_sendup(m, off, (struct sockaddr *)src,
                    773:                                inp->inp_socket);
                    774:                        rcvcnt++;
                    775:
                    776:                        /*
                    777:                         * Don't look for additional matches if this one does
                    778:                         * not have either the SO_REUSEPORT or SO_REUSEADDR
                    779:                         * socket options set.  This heuristic avoids searching
                    780:                         * through all pcbs in the common case of a non-shared
                    781:                         * port.  It assumes that an application will never
                    782:                         * clear these options after setting them.
                    783:                         */
                    784:                        if ((inp->inp_socket->so_options &
                    785:                            (SO_REUSEPORT|SO_REUSEADDR)) == 0)
                    786:                                break;
                    787:                }
                    788:        } else {
                    789:                /*
                    790:                 * Locate pcb for datagram.
                    791:                 */
                    792:                inp = in_pcblookup_connect(&udbtable, *src4, *sport, *dst4, *dport);
                    793:                if (inp == 0) {
                    794:                        ++udpstat.udps_pcbhashmiss;
                    795:                        inp = in_pcblookup_bind(&udbtable, *dst4, *dport);
1.82      itojun    796:                        if (inp == 0)
1.53      itojun    797:                                return rcvcnt;
                    798:                }
                    799:
1.103.2.7  skrll     800: #ifdef IPSEC_NAT_T
                    801:                /* Handle ESP over UDP */
                    802:                if (inp->inp_flags & INP_ESPINUDP_ALL) {
                    803:                        struct sockaddr *sa = (struct sockaddr *)src;
                    804:
                    805:                        if (udp4_espinudp(m, off, sa, inp->inp_socket) != 0) {
                    806:                                rcvcnt++;
                    807:                                goto bad;
                    808:                        }
                    809:
                    810:                        /* Normal UDP processing will take place */
                    811:                }
                    812: #endif
                    813:
1.53      itojun    814:                udp4_sendup(m, off, (struct sockaddr *)src, inp->inp_socket);
                    815:                rcvcnt++;
                    816:        }
                    817:
                    818: bad:
                    819:        return rcvcnt;
                    820: }
1.72      itojun    821: #endif
1.53      itojun    822:
                    823: #ifdef INET6
                    824: static int
1.103.2.2  skrll     825: udp6_realinput(int af, struct sockaddr_in6 *src, struct sockaddr_in6 *dst,
                    826:        struct mbuf *m, int off)
1.53      itojun    827: {
1.79      itojun    828:        u_int16_t sport, dport;
1.53      itojun    829:        int rcvcnt;
1.79      itojun    830:        struct in6_addr src6, dst6;
                    831:        const struct in_addr *dst4;
1.103.2.2  skrll     832:        struct inpcb_hdr *inph;
1.53      itojun    833:        struct in6pcb *in6p;
                    834:
                    835:        rcvcnt = 0;
                    836:        off += sizeof(struct udphdr);   /* now, offset of payload */
                    837:
                    838:        if (af != AF_INET && af != AF_INET6)
                    839:                goto bad;
                    840:        if (src->sin6_family != AF_INET6 || dst->sin6_family != AF_INET6)
                    841:                goto bad;
                    842:
1.79      itojun    843:        in6_embedscope(&src6, src, NULL, NULL);
                    844:        sport = src->sin6_port;
                    845:        in6_embedscope(&dst6, dst, NULL, NULL);
                    846:        dport = dst->sin6_port;
1.88      itojun    847:        dst4 = (struct in_addr *)&dst->sin6_addr.s6_addr[12];
1.53      itojun    848:
1.79      itojun    849:        if (IN6_IS_ADDR_MULTICAST(&dst6) ||
                    850:            (af == AF_INET && IN_MULTICAST(dst4->s_addr))) {
1.53      itojun    851:                /*
                    852:                 * Deliver a multicast or broadcast datagram to *all* sockets
                    853:                 * for which the local and remote addresses and ports match
                    854:                 * those of the incoming datagram.  This allows more than
                    855:                 * one process to receive multi/broadcasts on the same port.
                    856:                 * (This really ought to be done for unicast datagrams as
                    857:                 * well, but that would cause problems with existing
                    858:                 * applications that open both address-specific sockets and
                    859:                 * a wildcard socket listening to the same port -- they would
                    860:                 * end up receiving duplicates of every unicast datagram.
                    861:                 * Those applications open the multiple sockets to overcome an
                    862:                 * inadequacy of the UDP socket interface, but for backwards
                    863:                 * compatibility we avoid the problem here rather than
                    864:                 * fixing the interface.  Maybe 4.5BSD will remedy this?)
                    865:                 */
                    866:
                    867:                /*
1.92      itojun    868:                 * KAME note: traditionally we dropped udpiphdr from mbuf here.
1.71      itojun    869:                 * we need udpiphdr for IPsec processing so we do that later.
1.53      itojun    870:                 */
                    871:                /*
                    872:                 * Locate pcb(s) for datagram.
                    873:                 */
1.103.2.2  skrll     874:                CIRCLEQ_FOREACH(inph, &udbtable.inpt_queue, inph_queue) {
                    875:                        in6p = (struct in6pcb *)inph;
                    876:                        if (in6p->in6p_af != AF_INET6)
                    877:                                continue;
                    878:
1.79      itojun    879:                        if (in6p->in6p_lport != dport)
1.53      itojun    880:                                continue;
                    881:                        if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) {
1.90      itojun    882:                                if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &dst6))
1.53      itojun    883:                                        continue;
1.92      itojun    884:                        } else {
1.79      itojun    885:                                if (IN6_IS_ADDR_V4MAPPED(&dst6) &&
1.85      itojun    886:                                    (in6p->in6p_flags & IN6P_IPV6_V6ONLY))
1.55      itojun    887:                                        continue;
                    888:                        }
1.53      itojun    889:                        if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
1.79      itojun    890:                                if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr,
                    891:                                    &src6) || in6p->in6p_fport != sport)
1.53      itojun    892:                                        continue;
1.92      itojun    893:                        } else {
1.79      itojun    894:                                if (IN6_IS_ADDR_V4MAPPED(&src6) &&
1.85      itojun    895:                                    (in6p->in6p_flags & IN6P_IPV6_V6ONLY))
1.55      itojun    896:                                        continue;
                    897:                        }
1.53      itojun    898:
                    899:                        udp6_sendup(m, off, (struct sockaddr *)src,
                    900:                                in6p->in6p_socket);
                    901:                        rcvcnt++;
                    902:
                    903:                        /*
                    904:                         * Don't look for additional matches if this one does
                    905:                         * not have either the SO_REUSEPORT or SO_REUSEADDR
                    906:                         * socket options set.  This heuristic avoids searching
                    907:                         * through all pcbs in the common case of a non-shared
                    908:                         * port.  It assumes that an application will never
                    909:                         * clear these options after setting them.
                    910:                         */
                    911:                        if ((in6p->in6p_socket->so_options &
                    912:                            (SO_REUSEPORT|SO_REUSEADDR)) == 0)
                    913:                                break;
                    914:                }
                    915:        } else {
                    916:                /*
                    917:                 * Locate pcb for datagram.
                    918:                 */
1.103.2.2  skrll     919:                in6p = in6_pcblookup_connect(&udbtable, &src6, sport,
1.79      itojun    920:                    &dst6, dport, 0);
1.53      itojun    921:                if (in6p == 0) {
                    922:                        ++udpstat.udps_pcbhashmiss;
1.103.2.2  skrll     923:                        in6p = in6_pcblookup_bind(&udbtable, &dst6, dport, 0);
1.82      itojun    924:                        if (in6p == 0)
1.53      itojun    925:                                return rcvcnt;
                    926:                }
                    927:
                    928:                udp6_sendup(m, off, (struct sockaddr *)src, in6p->in6p_socket);
                    929:                rcvcnt++;
                    930:        }
                    931:
                    932: bad:
                    933:        return rcvcnt;
                    934: }
                    935: #endif
1.1       cgd       936:
1.72      itojun    937: #ifdef INET
1.1       cgd       938: /*
                    939:  * Notify a udp user of an asynchronous error;
                    940:  * just wake up so that he can collect error status.
                    941:  */
1.7       mycroft   942: static void
1.103.2.2  skrll     943: udp_notify(struct inpcb *inp, int errno)
1.1       cgd       944: {
                    945:        inp->inp_socket->so_error = errno;
                    946:        sorwakeup(inp->inp_socket);
                    947:        sowwakeup(inp->inp_socket);
                    948: }
                    949:
1.27      christos  950: void *
1.103.2.2  skrll     951: udp_ctlinput(int cmd, struct sockaddr *sa, void *v)
1.1       cgd       952: {
1.66      augustss  953:        struct ip *ip = v;
                    954:        struct udphdr *uh;
1.103.2.2  skrll     955:        void (*notify)(struct inpcb *, int) = udp_notify;
1.21      mycroft   956:        int errno;
1.1       cgd       957:
1.53      itojun    958:        if (sa->sa_family != AF_INET
                    959:         || sa->sa_len != sizeof(struct sockaddr_in))
1.51      itojun    960:                return NULL;
1.20      mycroft   961:        if ((unsigned)cmd >= PRC_NCMDS)
1.27      christos  962:                return NULL;
1.20      mycroft   963:        errno = inetctlerrmap[cmd];
1.18      mycroft   964:        if (PRC_IS_REDIRECT(cmd))
1.19      mycroft   965:                notify = in_rtchange, ip = 0;
1.18      mycroft   966:        else if (cmd == PRC_HOSTDEAD)
1.19      mycroft   967:                ip = 0;
1.23      cgd       968:        else if (errno == 0)
1.27      christos  969:                return NULL;
1.19      mycroft   970:        if (ip) {
1.1       cgd       971:                uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2));
1.34      mycroft   972:                in_pcbnotify(&udbtable, satosin(sa)->sin_addr, uh->uh_dport,
                    973:                    ip->ip_src, uh->uh_sport, errno, notify);
1.53      itojun    974:
                    975:                /* XXX mapped address case */
1.19      mycroft   976:        } else
1.34      mycroft   977:                in_pcbnotifyall(&udbtable, satosin(sa)->sin_addr, errno,
                    978:                    notify);
1.27      christos  979:        return NULL;
1.1       cgd       980: }
                    981:
1.7       mycroft   982: int
1.103.2.8  skrll     983: udp_ctloutput(op, so, level, optname, mp)
1.103.2.7  skrll     984:        int op;
                    985:        struct socket *so;
                    986:        int level, optname;
                    987:        struct mbuf **mp;
                    988: {
                    989:        int s;
                    990:        int error = 0;
                    991:        struct mbuf *m;
                    992:        struct inpcb *inp;
                    993:        int family;
                    994:
                    995:        family = so->so_proto->pr_domain->dom_family;
                    996:
                    997:        s = splsoftnet();
                    998:        switch (family) {
                    999: #ifdef INET
                   1000:        case PF_INET:
                   1001:                if (level != IPPROTO_UDP) {
                   1002:                        error = ip_ctloutput(op, so, level, optname, mp);
                   1003:                        goto end;
                   1004:                }
                   1005:                break;
                   1006: #endif
                   1007: #ifdef INET6
                   1008:        case PF_INET6:
                   1009:                if (level != IPPROTO_UDP) {
                   1010:                        error = ip6_ctloutput(op, so, level, optname, mp);
                   1011:                        goto end;
                   1012:                }
                   1013:                break;
                   1014: #endif
                   1015:        default:
                   1016:                error = EAFNOSUPPORT;
                   1017:                goto end;
                   1018:                break;
                   1019:        }
                   1020:
                   1021:
                   1022:        switch (op) {
                   1023:        case PRCO_SETOPT:
                   1024:                m = *mp;
                   1025:                inp = sotoinpcb(so);
                   1026:
                   1027:                switch (optname) {
                   1028:                case UDP_ENCAP:
                   1029:                        if (m == NULL || m->m_len < sizeof (int)) {
                   1030:                                error = EINVAL;
                   1031:                                goto end;
                   1032:                        }
1.103.2.8  skrll    1033:
1.103.2.7  skrll    1034:                        switch(*mtod(m, int *)) {
                   1035: #ifdef IPSEC_NAT_T
                   1036:                        case 0:
                   1037:                                inp->inp_flags &= ~INP_ESPINUDP_ALL;
                   1038:                                break;
                   1039:
                   1040:                        case UDP_ENCAP_ESPINUDP:
                   1041:                                inp->inp_flags &= ~INP_ESPINUDP_ALL;
                   1042:                                inp->inp_flags |= INP_ESPINUDP;
                   1043:                                break;
1.103.2.8  skrll    1044:
1.103.2.7  skrll    1045:                        case UDP_ENCAP_ESPINUDP_NON_IKE:
                   1046:                                inp->inp_flags &= ~INP_ESPINUDP_ALL;
                   1047:                                inp->inp_flags |= INP_ESPINUDP_NON_IKE;
                   1048:                                break;
                   1049: #endif
                   1050:                        default:
                   1051:                                error = EINVAL;
                   1052:                                goto end;
                   1053:                                break;
                   1054:                        }
                   1055:                        break;
                   1056:
                   1057:                default:
                   1058:                        error = ENOPROTOOPT;
                   1059:                        goto end;
                   1060:                        break;
                   1061:                }
                   1062:                break;
                   1063:
                   1064:        default:
                   1065:                error = EINVAL;
                   1066:                goto end;
                   1067:                break;
1.103.2.8  skrll    1068:        }
                   1069:
1.103.2.7  skrll    1070: end:
                   1071:        splx(s);
                   1072:        return error;
                   1073: }
1.103.2.8  skrll    1074:
1.103.2.7  skrll    1075:
                   1076: int
1.27      christos 1077: udp_output(struct mbuf *m, ...)
                   1078: {
1.66      augustss 1079:        struct inpcb *inp;
                   1080:        struct udpiphdr *ui;
1.103.2.5  skrll    1081:        struct route *ro;
1.66      augustss 1082:        int len = m->m_pkthdr.len;
1.31      mycroft  1083:        int error = 0;
1.27      christos 1084:        va_list ap;
                   1085:
1.98      matt     1086:        MCLAIM(m, &udp_tx_mowner);
1.27      christos 1087:        va_start(ap, m);
                   1088:        inp = va_arg(ap, struct inpcb *);
                   1089:        va_end(ap);
1.1       cgd      1090:
                   1091:        /*
                   1092:         * Calculate data length and get a mbuf
                   1093:         * for UDP and IP headers.
                   1094:         */
1.13      mycroft  1095:        M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT);
                   1096:        if (m == 0) {
                   1097:                error = ENOBUFS;
1.39      thorpej  1098:                goto release;
                   1099:        }
                   1100:
                   1101:        /*
                   1102:         * Compute the packet length of the IP header, and
                   1103:         * punt if the length looks bogus.
                   1104:         */
1.96      itojun   1105:        if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) {
1.39      thorpej  1106:                error = EMSGSIZE;
1.13      mycroft  1107:                goto release;
                   1108:        }
1.1       cgd      1109:
                   1110:        /*
                   1111:         * Fill in mbuf with extended UDP header
                   1112:         * and addresses and length put into network format.
                   1113:         */
                   1114:        ui = mtod(m, struct udpiphdr *);
                   1115:        ui->ui_pr = IPPROTO_UDP;
                   1116:        ui->ui_src = inp->inp_laddr;
                   1117:        ui->ui_dst = inp->inp_faddr;
                   1118:        ui->ui_sport = inp->inp_lport;
                   1119:        ui->ui_dport = inp->inp_fport;
1.78      thorpej  1120:        ui->ui_ulen = htons((u_int16_t)len + sizeof(struct udphdr));
1.1       cgd      1121:
1.103.2.5  skrll    1122:        ro = &inp->inp_route;
                   1123:
1.1       cgd      1124:        /*
1.78      thorpej  1125:         * Set up checksum and output datagram.
1.1       cgd      1126:         */
                   1127:        if (udpcksum) {
1.78      thorpej  1128:                /*
                   1129:                 * XXX Cache pseudo-header checksum part for
                   1130:                 * XXX "connected" UDP sockets.
                   1131:                 */
                   1132:                ui->ui_sum = in_cksum_phdr(ui->ui_src.s_addr,
                   1133:                    ui->ui_dst.s_addr, htons((u_int16_t)len +
                   1134:                    sizeof(struct udphdr) + IPPROTO_UDP));
1.103.2.10! skrll    1135:                m->m_pkthdr.csum_flags = M_CSUM_UDPv4;
1.78      thorpej  1136:                m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
                   1137:        } else
                   1138:                ui->ui_sum = 0;
1.96      itojun   1139:        ((struct ip *)ui)->ip_len = htons(sizeof (struct udpiphdr) + len);
1.1       cgd      1140:        ((struct ip *)ui)->ip_ttl = inp->inp_ip.ip_ttl; /* XXX */
                   1141:        ((struct ip *)ui)->ip_tos = inp->inp_ip.ip_tos; /* XXX */
                   1142:        udpstat.udps_opackets++;
1.48      itojun   1143:
1.103.2.5  skrll    1144:        return (ip_output(m, inp->inp_options, ro,
1.12      mycroft  1145:            inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST),
1.103.2.2  skrll    1146:            inp->inp_moptions, inp->inp_socket));
1.1       cgd      1147:
                   1148: release:
                   1149:        m_freem(m);
                   1150:        return (error);
                   1151: }
                   1152:
1.42      thorpej  1153: int    udp_sendspace = 9216;           /* really max datagram size */
                   1154: int    udp_recvspace = 40 * (1024 + sizeof(struct sockaddr_in));
1.1       cgd      1155:                                        /* 40 1K datagrams */
                   1156:
                   1157: /*ARGSUSED*/
1.7       mycroft  1158: int
1.103.2.2  skrll    1159: udp_usrreq(struct socket *so, int req, struct mbuf *m, struct mbuf *nam,
1.103.2.4  skrll    1160:        struct mbuf *control, struct lwp *l)
1.1       cgd      1161: {
1.66      augustss 1162:        struct inpcb *inp;
1.103.2.4  skrll    1163:        struct proc *p;
1.1       cgd      1164:        int s;
1.66      augustss 1165:        int error = 0;
1.1       cgd      1166:
1.103.2.4  skrll    1167:        p = l ? l->l_proc : NULL;
1.1       cgd      1168:        if (req == PRU_CONTROL)
1.31      mycroft  1169:                return (in_control(so, (long)m, (caddr_t)nam,
1.30      mycroft  1170:                    (struct ifnet *)control, p));
1.59      thorpej  1171:
1.60      thorpej  1172:        if (req == PRU_PURGEIF) {
1.80      itojun   1173:                in_pcbpurgeif0(&udbtable, (struct ifnet *)control);
1.60      thorpej  1174:                in_purgeif((struct ifnet *)control);
                   1175:                in_pcbpurgeif(&udbtable, (struct ifnet *)control);
1.59      thorpej  1176:                return (0);
                   1177:        }
1.31      mycroft  1178:
                   1179:        s = splsoftnet();
                   1180:        inp = sotoinpcb(so);
1.32      mycroft  1181: #ifdef DIAGNOSTIC
                   1182:        if (req != PRU_SEND && req != PRU_SENDOOB && control)
                   1183:                panic("udp_usrreq: unexpected control mbuf");
                   1184: #endif
1.31      mycroft  1185:        if (inp == 0 && req != PRU_ATTACH) {
                   1186:                error = EINVAL;
                   1187:                goto release;
                   1188:        }
                   1189:
1.1       cgd      1190:        /*
                   1191:         * Note: need to block udp_input while changing
                   1192:         * the udp pcb queue and/or pcb addresses.
                   1193:         */
                   1194:        switch (req) {
                   1195:
                   1196:        case PRU_ATTACH:
1.31      mycroft  1197:                if (inp != 0) {
                   1198:                        error = EISCONN;
1.1       cgd      1199:                        break;
                   1200:                }
1.98      matt     1201: #ifdef MBUFTRACE
                   1202:                so->so_mowner = &udp_mowner;
                   1203:                so->so_rcv.sb_mowner = &udp_rx_mowner;
                   1204:                so->so_snd.sb_mowner = &udp_tx_mowner;
                   1205: #endif
1.31      mycroft  1206:                if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
                   1207:                        error = soreserve(so, udp_sendspace, udp_recvspace);
                   1208:                        if (error)
                   1209:                                break;
                   1210:                }
1.18      mycroft  1211:                error = in_pcballoc(so, &udbtable);
1.1       cgd      1212:                if (error)
                   1213:                        break;
1.31      mycroft  1214:                inp = sotoinpcb(so);
                   1215:                inp->inp_ip.ip_ttl = ip_defttl;
1.1       cgd      1216:                break;
                   1217:
                   1218:        case PRU_DETACH:
1.31      mycroft  1219:                in_pcbdetach(inp);
1.1       cgd      1220:                break;
                   1221:
                   1222:        case PRU_BIND:
1.31      mycroft  1223:                error = in_pcbbind(inp, nam, p);
1.1       cgd      1224:                break;
                   1225:
                   1226:        case PRU_LISTEN:
                   1227:                error = EOPNOTSUPP;
                   1228:                break;
                   1229:
                   1230:        case PRU_CONNECT:
1.31      mycroft  1231:                error = in_pcbconnect(inp, nam);
                   1232:                if (error)
1.1       cgd      1233:                        break;
1.31      mycroft  1234:                soisconnected(so);
1.1       cgd      1235:                break;
                   1236:
                   1237:        case PRU_CONNECT2:
                   1238:                error = EOPNOTSUPP;
                   1239:                break;
                   1240:
                   1241:        case PRU_DISCONNECT:
1.31      mycroft  1242:                /*soisdisconnected(so);*/
                   1243:                so->so_state &= ~SS_ISCONNECTED;        /* XXX */
1.1       cgd      1244:                in_pcbdisconnect(inp);
1.34      mycroft  1245:                inp->inp_laddr = zeroin_addr;           /* XXX */
1.35      mycroft  1246:                in_pcbstate(inp, INP_BOUND);            /* XXX */
1.1       cgd      1247:                break;
                   1248:
                   1249:        case PRU_SHUTDOWN:
                   1250:                socantsendmore(so);
                   1251:                break;
                   1252:
1.31      mycroft  1253:        case PRU_RCVD:
                   1254:                error = EOPNOTSUPP;
1.1       cgd      1255:                break;
                   1256:
1.31      mycroft  1257:        case PRU_SEND:
1.32      mycroft  1258:                if (control && control->m_len) {
                   1259:                        m_freem(control);
                   1260:                        m_freem(m);
                   1261:                        error = EINVAL;
                   1262:                        break;
                   1263:                }
1.31      mycroft  1264:        {
1.35      mycroft  1265:                struct in_addr laddr;                   /* XXX */
1.1       cgd      1266:
1.31      mycroft  1267:                if (nam) {
1.35      mycroft  1268:                        laddr = inp->inp_laddr;         /* XXX */
1.31      mycroft  1269:                        if ((so->so_state & SS_ISCONNECTED) != 0) {
                   1270:                                error = EISCONN;
1.32      mycroft  1271:                                goto die;
1.31      mycroft  1272:                        }
                   1273:                        error = in_pcbconnect(inp, nam);
1.100     matt     1274:                        if (error)
                   1275:                                goto die;
1.31      mycroft  1276:                } else {
                   1277:                        if ((so->so_state & SS_ISCONNECTED) == 0) {
                   1278:                                error = ENOTCONN;
1.32      mycroft  1279:                                goto die;
1.31      mycroft  1280:                        }
                   1281:                }
1.33      mycroft  1282:                error = udp_output(m, inp);
1.100     matt     1283:                m = NULL;
1.31      mycroft  1284:                if (nam) {
                   1285:                        in_pcbdisconnect(inp);
1.35      mycroft  1286:                        inp->inp_laddr = laddr;         /* XXX */
                   1287:                        in_pcbstate(inp, INP_BOUND);    /* XXX */
1.31      mycroft  1288:                }
1.100     matt     1289:          die:
                   1290:                if (m)
                   1291:                        m_freem(m);
1.31      mycroft  1292:        }
1.1       cgd      1293:                break;
                   1294:
                   1295:        case PRU_SENSE:
                   1296:                /*
                   1297:                 * stat: don't bother with a blocksize.
                   1298:                 */
1.31      mycroft  1299:                splx(s);
1.1       cgd      1300:                return (0);
                   1301:
1.31      mycroft  1302:        case PRU_RCVOOB:
                   1303:                error =  EOPNOTSUPP;
                   1304:                break;
                   1305:
1.1       cgd      1306:        case PRU_SENDOOB:
1.32      mycroft  1307:                m_freem(control);
1.31      mycroft  1308:                m_freem(m);
1.1       cgd      1309:                error =  EOPNOTSUPP;
                   1310:                break;
                   1311:
1.31      mycroft  1312:        case PRU_SOCKADDR:
                   1313:                in_setsockaddr(inp, nam);
                   1314:                break;
                   1315:
                   1316:        case PRU_PEERADDR:
                   1317:                in_setpeeraddr(inp, nam);
                   1318:                break;
1.1       cgd      1319:
                   1320:        default:
                   1321:                panic("udp_usrreq");
                   1322:        }
                   1323:
                   1324: release:
1.31      mycroft  1325:        splx(s);
1.1       cgd      1326:        return (error);
1.13      mycroft  1327: }
                   1328:
                   1329: /*
                   1330:  * Sysctl for udp variables.
                   1331:  */
1.103.2.2  skrll    1332: SYSCTL_SETUP(sysctl_net_inet_udp_setup, "sysctl net.inet.udp subtree setup")
1.13      mycroft  1333: {
1.103.2.2  skrll    1334:
                   1335:        sysctl_createv(clog, 0, NULL, NULL,
                   1336:                       CTLFLAG_PERMANENT,
                   1337:                       CTLTYPE_NODE, "net", NULL,
                   1338:                       NULL, 0, NULL, 0,
                   1339:                       CTL_NET, CTL_EOL);
                   1340:        sysctl_createv(clog, 0, NULL, NULL,
                   1341:                       CTLFLAG_PERMANENT,
                   1342:                       CTLTYPE_NODE, "inet", NULL,
                   1343:                       NULL, 0, NULL, 0,
                   1344:                       CTL_NET, PF_INET, CTL_EOL);
                   1345:        sysctl_createv(clog, 0, NULL, NULL,
                   1346:                       CTLFLAG_PERMANENT,
                   1347:                       CTLTYPE_NODE, "udp",
                   1348:                       SYSCTL_DESCR("UDPv4 related settings"),
                   1349:                       NULL, 0, NULL, 0,
                   1350:                       CTL_NET, PF_INET, IPPROTO_UDP, CTL_EOL);
                   1351:
                   1352:        sysctl_createv(clog, 0, NULL, NULL,
                   1353:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1354:                       CTLTYPE_INT, "checksum",
                   1355:                       SYSCTL_DESCR("Compute UDP checksums"),
                   1356:                       NULL, 0, &udpcksum, 0,
                   1357:                       CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_CHECKSUM,
                   1358:                       CTL_EOL);
                   1359:        sysctl_createv(clog, 0, NULL, NULL,
                   1360:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1361:                       CTLTYPE_INT, "sendspace",
                   1362:                       SYSCTL_DESCR("Default UDP send buffer size"),
                   1363:                       NULL, 0, &udp_sendspace, 0,
                   1364:                       CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_SENDSPACE,
                   1365:                       CTL_EOL);
                   1366:        sysctl_createv(clog, 0, NULL, NULL,
                   1367:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1368:                       CTLTYPE_INT, "recvspace",
                   1369:                       SYSCTL_DESCR("Default UDP receive buffer size"),
                   1370:                       NULL, 0, &udp_recvspace, 0,
                   1371:                       CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_RECVSPACE,
                   1372:                       CTL_EOL);
1.103.2.5  skrll    1373:        sysctl_createv(clog, 0, NULL, NULL,
                   1374:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1375:                       CTLTYPE_INT, "do_loopback_cksum",
                   1376:                       SYSCTL_DESCR("Perform UDP checksum on loopback"),
                   1377:                       NULL, 0, &udp_do_loopback_cksum, 0,
                   1378:                       CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_LOOPBACKCKSUM,
                   1379:                       CTL_EOL);
1.103.2.9  skrll    1380:        sysctl_createv(clog, 0, NULL, NULL,
                   1381:                       CTLFLAG_PERMANENT,
                   1382:                       CTLTYPE_STRUCT, "pcblist",
                   1383:                       SYSCTL_DESCR("UDP protocol control block list"),
                   1384:                       sysctl_inpcblist, 0, &udbtable, 0,
                   1385:                       CTL_NET, PF_INET, IPPROTO_UDP, CTL_CREATE,
                   1386:                       CTL_EOL);
1.103.2.10! skrll    1387:        sysctl_createv(clog, 0, NULL, NULL,
        !          1388:                       CTLFLAG_PERMANENT,
        !          1389:                       CTLTYPE_STRUCT, "stats",
        !          1390:                       SYSCTL_DESCR("UDP statistics"),
        !          1391:                       NULL, 0, &udpstat, sizeof(udpstat),
        !          1392:                       CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_STATS,
        !          1393:                       CTL_EOL);
1.1       cgd      1394: }
1.72      itojun   1395: #endif
1.103.2.7  skrll    1396:
                   1397: #if (defined INET && defined IPSEC_NAT_T)
                   1398: /*
                   1399:  * Returns:
                   1400:  * 1 if the packet was processed
                   1401:  * 0 if normal UDP processing should take place
                   1402:  */
                   1403: static int
                   1404: udp4_espinudp(m, off, src, so)
                   1405:        struct mbuf *m;
                   1406:        int off;
                   1407:        struct sockaddr *src;
                   1408:        struct socket *so;
                   1409: {
                   1410:        size_t len;
                   1411:        caddr_t data;
                   1412:        struct inpcb *inp;
                   1413:        size_t skip = 0;
                   1414:        size_t minlen;
                   1415:        size_t iphdrlen;
                   1416:        struct ip *ip;
                   1417:        struct mbuf *n;
1.103.2.10! skrll    1418:        struct m_tag *tag;
        !          1419:        struct udphdr *udphdr;
        !          1420:        u_int16_t sport, dport;
1.103.2.7  skrll    1421:
1.103.2.8  skrll    1422:        /*
1.103.2.7  skrll    1423:         * Collapse the mbuf chain if the first mbuf is too short
                   1424:         * The longest case is: UDP + non ESP marker + ESP
                   1425:         */
                   1426:        minlen = off + sizeof(u_int64_t) + sizeof(struct esp);
                   1427:        if (minlen > m->m_pkthdr.len)
                   1428:                minlen = m->m_pkthdr.len;
                   1429:
                   1430:        if (m->m_len < minlen) {
                   1431:                if ((m = m_pullup(m, minlen)) == NULL) {
                   1432:                        printf("udp4_espinudp: m_pullup failed\n");
                   1433:                        return 0;
                   1434:                }
                   1435:        }
                   1436:
1.103.2.8  skrll    1437:        len = m->m_len - off;
1.103.2.7  skrll    1438:        data = mtod(m, caddr_t) + off;
                   1439:        inp = sotoinpcb(so);
                   1440:
                   1441:        /* Ignore keepalive packets */
                   1442:        if ((len == 1) && (data[0] == '\xff')) {
                   1443:                return 1;
                   1444:        }
                   1445:
1.103.2.8  skrll    1446:        /*
                   1447:         * Check that the payload is long enough to hold
1.103.2.7  skrll    1448:         * an ESP header and compute the length of encapsulation
1.103.2.8  skrll    1449:         * header to remove
1.103.2.7  skrll    1450:         */
                   1451:        if (inp->inp_flags & INP_ESPINUDP) {
                   1452:                u_int32_t *st = (u_int32_t *)data;
                   1453:
                   1454:                if ((len <= sizeof(struct esp)) || (*st == 0))
                   1455:                        return 0; /* Normal UDP processing */
                   1456:
                   1457:                skip = sizeof(struct udphdr);
                   1458:        }
                   1459:
                   1460:        if (inp->inp_flags & INP_ESPINUDP_NON_IKE) {
1.103.2.10! skrll    1461:                u_int32_t *st = (u_int32_t *)data;
1.103.2.7  skrll    1462:
                   1463:                if ((len <= sizeof(u_int64_t) + sizeof(struct esp))
1.103.2.10! skrll    1464:                    || ((st[0] | st[1]) != 0))
1.103.2.7  skrll    1465:                        return 0; /* Normal UDP processing */
1.103.2.8  skrll    1466:
1.103.2.7  skrll    1467:                skip = sizeof(struct udphdr) + sizeof(u_int64_t);
                   1468:        }
                   1469:
                   1470:        /*
1.103.2.10! skrll    1471:         * Get the UDP ports. They are handled in network
        !          1472:         * order everywhere in IPSEC_NAT_T code.
        !          1473:         */
        !          1474:        udphdr = (struct udphdr *)(data - skip);
        !          1475:        sport = udphdr->uh_sport;
        !          1476:        dport = udphdr->uh_dport;
        !          1477:
        !          1478:        /*
1.103.2.7  skrll    1479:         * Remove the UDP header (and possibly the non ESP marker)
                   1480:         * IP header lendth is iphdrlen
1.103.2.8  skrll    1481:         * Before:
1.103.2.7  skrll    1482:         *   <--- off --->
                   1483:         *   +----+------+-----+
                   1484:         *   | IP |  UDP | ESP |
                   1485:         *   +----+------+-----+
                   1486:         *        <-skip->
                   1487:         * After:
                   1488:         *          +----+-----+
                   1489:         *          | IP | ESP |
                   1490:         *          +----+-----+
                   1491:         *   <-skip->
                   1492:         */
                   1493:        iphdrlen = off - sizeof(struct udphdr);
                   1494:        memmove(mtod(m, caddr_t) + skip, mtod(m, caddr_t), iphdrlen);
                   1495:        m_adj(m, skip);
                   1496:
                   1497:        ip = mtod(m, struct ip *);
                   1498:        ip->ip_len = htons(ntohs(ip->ip_len) - skip);
                   1499:        ip->ip_p = IPPROTO_ESP;
                   1500:
                   1501:        /*
1.103.2.8  skrll    1502:         * Copy the mbuf to avoid multiple free, as both
                   1503:         * esp4_input (which we call) and udp_input (which
1.103.2.7  skrll    1504:         * called us) free the mbuf.
                   1505:         */
                   1506:        if ((n = m_dup(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
                   1507:                printf("udp4_espinudp: m_dup failed\n");
                   1508:                return 0;
                   1509:        }
                   1510:
1.103.2.10! skrll    1511:        /*
        !          1512:         * Add a PACKET_TAG_IPSEC_NAT_T_PORT tag to remember
        !          1513:         * the source UDP port. This is required if we want
        !          1514:         * to select the right SPD for multiple hosts behind
        !          1515:         * same NAT
        !          1516:         */
        !          1517:        if ((tag = m_tag_get(PACKET_TAG_IPSEC_NAT_T_PORTS,
        !          1518:            sizeof(sport) + sizeof(dport), M_DONTWAIT)) == NULL) {
        !          1519:                printf("udp4_espinudp: m_tag_get failed\n");
        !          1520:                m_freem(n);
        !          1521:                return 0;
        !          1522:        }
        !          1523:        ((u_int16_t *)(tag + 1))[0] = sport;
        !          1524:        ((u_int16_t *)(tag + 1))[1] = dport;
        !          1525:        m_tag_prepend(n, tag);
        !          1526:
1.103.2.7  skrll    1527:        esp4_input(n, iphdrlen);
                   1528:
                   1529:        /* We handled it, it shoudln't be handled by UDP */
                   1530:        return 1;
                   1531: }
                   1532: #endif

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