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Annotation of src/sys/netinet/udp_usrreq.c, Revision 1.162.6.1

1.162.6.1! mjf         1: /*     $NetBSD: udp_usrreq.c,v 1.163 2007/11/27 22:45:30 christos 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.
1.104     agc        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>
1.162.6.1! mjf        64: __KERNEL_RCSID(0, "$NetBSD: udp_usrreq.c,v 1.163 2007/11/27 22:45:30 christos 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:
1.53      itojun     98: #ifdef INET6
                     99: #include <netinet/ip6.h>
                    100: #include <netinet/icmp6.h>
                    101: #include <netinet6/ip6_var.h>
                    102: #include <netinet6/in6_pcb.h>
                    103: #include <netinet6/udp6_var.h>
1.146     rpaulo    104: #include <netinet6/scope6_var.h>
1.53      itojun    105: #endif
                    106:
                    107: #ifndef INET6
                    108: /* always need ip6.h for IP6_EXTHDR_GET */
                    109: #include <netinet/ip6.h>
                    110: #endif
                    111:
1.76      itojun    112: #include "faith.h"
                    113: #if defined(NFAITH) && NFAITH > 0
                    114: #include <net/if_faith.h>
                    115: #endif
                    116:
1.27      christos  117: #include <machine/stdarg.h>
                    118:
1.105     jonathan  119: #ifdef FAST_IPSEC
                    120: #include <netipsec/ipsec.h>
1.121     jonathan  121: #include <netipsec/ipsec_var.h>                        /* XXX ipsecstat namespace */
1.147     christos  122: #include <netipsec/esp.h>
1.105     jonathan  123: #ifdef INET6
                    124: #include <netipsec/ipsec6.h>
                    125: #endif
                    126: #endif /* FAST_IPSEC*/
                    127:
1.48      itojun    128: #ifdef IPSEC
                    129: #include <netinet6/ipsec.h>
1.147     christos  130: #include <netinet6/esp.h>
1.48      itojun    131: #include <netkey/key.h>
                    132: #endif /*IPSEC*/
                    133:
1.64      ws        134: #ifdef IPKDB
                    135: #include <ipkdb/ipkdb.h>
                    136: #endif
                    137:
1.8       mycroft   138: /*
                    139:  * UDP protocol implementation.
                    140:  * Per RFC 768, August, 1980.
                    141:  */
                    142: int    udpcksum = 1;
1.141     yamt      143: int    udp_do_loopback_cksum = 0;
1.93      matt      144:
                    145: struct inpcbtable udbtable;
                    146: struct udpstat udpstat;
1.8       mycroft   147:
1.72      itojun    148: #ifdef INET
1.130     manu      149: #ifdef IPSEC_NAT_T
1.144     manu      150: static int udp4_espinudp (struct mbuf **, int, struct sockaddr *,
1.130     manu      151:        struct socket *);
                    152: #endif
1.119     matt      153: static void udp4_sendup (struct mbuf *, int, struct sockaddr *,
                    154:        struct socket *);
                    155: static int udp4_realinput (struct sockaddr_in *, struct sockaddr_in *,
1.144     manu      156:        struct mbuf **, int);
1.129     yamt      157: static int udp4_input_checksum(struct mbuf *, const struct udphdr *, int, int);
1.72      itojun    158: #endif
1.53      itojun    159: #ifdef INET6
1.119     matt      160: static void udp6_sendup (struct mbuf *, int, struct sockaddr *,
                    161:        struct socket *);
                    162: static int udp6_realinput (int, struct sockaddr_in6 *,
                    163:        struct sockaddr_in6 *, struct mbuf *, int);
1.129     yamt      164: static int udp6_input_checksum(struct mbuf *, const struct udphdr *, int, int);
1.53      itojun    165: #endif
1.72      itojun    166: #ifdef INET
1.119     matt      167: static void udp_notify (struct inpcb *, int);
1.72      itojun    168: #endif
1.7       mycroft   169:
1.26      mycroft   170: #ifndef UDBHASHSIZE
                    171: #define        UDBHASHSIZE     128
                    172: #endif
                    173: int    udbhashsize = UDBHASHSIZE;
                    174:
1.98      matt      175: #ifdef MBUFTRACE
1.150     dogcow    176: struct mowner udp_mowner = MOWNER_INIT("udp", "");
                    177: struct mowner udp_rx_mowner = MOWNER_INIT("udp", "rx");
                    178: struct mowner udp_tx_mowner = MOWNER_INIT("udp", "tx");
1.98      matt      179: #endif
                    180:
1.78      thorpej   181: #ifdef UDP_CSUM_COUNTERS
                    182: #include <sys/device.h>
                    183:
1.140     yamt      184: #if defined(INET)
1.78      thorpej   185: struct evcnt udp_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    186:     NULL, "udp", "hwcsum bad");
                    187: struct evcnt udp_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    188:     NULL, "udp", "hwcsum ok");
                    189: struct evcnt udp_hwcsum_data = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    190:     NULL, "udp", "hwcsum data");
                    191: struct evcnt udp_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    192:     NULL, "udp", "swcsum");
                    193:
1.120     matt      194: EVCNT_ATTACH_STATIC(udp_hwcsum_bad);
                    195: EVCNT_ATTACH_STATIC(udp_hwcsum_ok);
                    196: EVCNT_ATTACH_STATIC(udp_hwcsum_data);
                    197: EVCNT_ATTACH_STATIC(udp_swcsum);
1.140     yamt      198: #endif /* defined(INET) */
                    199:
                    200: #if defined(INET6)
                    201: struct evcnt udp6_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    202:     NULL, "udp6", "hwcsum bad");
                    203: struct evcnt udp6_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    204:     NULL, "udp6", "hwcsum ok");
                    205: struct evcnt udp6_hwcsum_data = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    206:     NULL, "udp6", "hwcsum data");
                    207: struct evcnt udp6_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    208:     NULL, "udp6", "swcsum");
                    209:
                    210: EVCNT_ATTACH_STATIC(udp6_hwcsum_bad);
                    211: EVCNT_ATTACH_STATIC(udp6_hwcsum_ok);
                    212: EVCNT_ATTACH_STATIC(udp6_hwcsum_data);
                    213: EVCNT_ATTACH_STATIC(udp6_swcsum);
                    214: #endif /* defined(INET6) */
                    215:
                    216: #define        UDP_CSUM_COUNTER_INCR(ev)       (ev)->ev_count++
1.120     matt      217:
1.78      thorpej   218: #else
                    219:
                    220: #define        UDP_CSUM_COUNTER_INCR(ev)       /* nothing */
                    221:
                    222: #endif /* UDP_CSUM_COUNTERS */
                    223:
1.7       mycroft   224: void
1.119     matt      225: udp_init(void)
1.1       cgd       226: {
1.18      mycroft   227:
1.35      mycroft   228:        in_pcbinit(&udbtable, udbhashsize, udbhashsize);
1.78      thorpej   229:
1.98      matt      230:        MOWNER_ATTACH(&udp_tx_mowner);
                    231:        MOWNER_ATTACH(&udp_rx_mowner);
                    232:        MOWNER_ATTACH(&udp_mowner);
1.1       cgd       233: }
                    234:
1.129     yamt      235: /*
                    236:  * Checksum extended UDP header and data.
                    237:  */
                    238:
                    239: int
                    240: udp_input_checksum(int af, struct mbuf *m, const struct udphdr *uh,
                    241:     int iphlen, int len)
                    242: {
                    243:
                    244:        switch (af) {
1.72      itojun    245: #ifdef INET
1.129     yamt      246:        case AF_INET:
                    247:                return udp4_input_checksum(m, uh, iphlen, len);
                    248: #endif
                    249: #ifdef INET6
                    250:        case AF_INET6:
                    251:                return udp6_input_checksum(m, uh, iphlen, len);
                    252: #endif
                    253:        }
                    254: #ifdef DIAGNOSTIC
                    255:        panic("udp_input_checksum: unknown af %d", af);
                    256: #endif
                    257:        /* NOTREACHED */
                    258:        return -1;
                    259: }
                    260:
                    261: #ifdef INET
                    262:
                    263: /*
                    264:  * Checksum extended UDP header and data.
                    265:  */
                    266:
                    267: static int
                    268: udp4_input_checksum(struct mbuf *m, const struct udphdr *uh,
                    269:     int iphlen, int len)
                    270: {
                    271:
                    272:        /*
                    273:         * XXX it's better to record and check if this mbuf is
                    274:         * already checked.
                    275:         */
                    276:
                    277:        if (uh->uh_sum == 0)
                    278:                return 0;
                    279:
                    280:        switch (m->m_pkthdr.csum_flags &
                    281:            ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_UDPv4) |
                    282:            M_CSUM_TCP_UDP_BAD | M_CSUM_DATA)) {
                    283:        case M_CSUM_UDPv4|M_CSUM_TCP_UDP_BAD:
                    284:                UDP_CSUM_COUNTER_INCR(&udp_hwcsum_bad);
                    285:                goto badcsum;
                    286:
                    287:        case M_CSUM_UDPv4|M_CSUM_DATA: {
                    288:                u_int32_t hw_csum = m->m_pkthdr.csum_data;
                    289:
                    290:                UDP_CSUM_COUNTER_INCR(&udp_hwcsum_data);
                    291:                if (m->m_pkthdr.csum_flags & M_CSUM_NO_PSEUDOHDR) {
                    292:                        const struct ip *ip =
                    293:                            mtod(m, const struct ip *);
                    294:
                    295:                        hw_csum = in_cksum_phdr(ip->ip_src.s_addr,
                    296:                            ip->ip_dst.s_addr,
                    297:                            htons(hw_csum + len + IPPROTO_UDP));
                    298:                }
                    299:                if ((hw_csum ^ 0xffff) != 0)
                    300:                        goto badcsum;
                    301:                break;
                    302:        }
                    303:
                    304:        case M_CSUM_UDPv4:
                    305:                /* Checksum was okay. */
                    306:                UDP_CSUM_COUNTER_INCR(&udp_hwcsum_ok);
                    307:                break;
                    308:
                    309:        default:
                    310:                /*
                    311:                 * Need to compute it ourselves.  Maybe skip checksum
                    312:                 * on loopback interfaces.
                    313:                 */
                    314:                if (__predict_true(!(m->m_pkthdr.rcvif->if_flags &
                    315:                                     IFF_LOOPBACK) ||
                    316:                                   udp_do_loopback_cksum)) {
                    317:                        UDP_CSUM_COUNTER_INCR(&udp_swcsum);
                    318:                        if (in4_cksum(m, IPPROTO_UDP, iphlen, len) != 0)
                    319:                                goto badcsum;
                    320:                }
                    321:                break;
                    322:        }
                    323:
                    324:        return 0;
                    325:
                    326: badcsum:
                    327:        udpstat.udps_badsum++;
                    328:        return -1;
                    329: }
                    330:
1.7       mycroft   331: void
1.27      christos  332: udp_input(struct mbuf *m, ...)
1.1       cgd       333: {
1.53      itojun    334:        va_list ap;
                    335:        struct sockaddr_in src, dst;
                    336:        struct ip *ip;
                    337:        struct udphdr *uh;
1.97      simonb    338:        int iphlen;
1.53      itojun    339:        int len;
                    340:        int n;
1.96      itojun    341:        u_int16_t ip_len;
1.53      itojun    342:
                    343:        va_start(ap, m);
                    344:        iphlen = va_arg(ap, int);
1.97      simonb    345:        (void)va_arg(ap, int);          /* ignore value, advance ap */
1.53      itojun    346:        va_end(ap);
                    347:
1.98      matt      348:        MCLAIM(m, &udp_rx_mowner);
1.53      itojun    349:        udpstat.udps_ipackets++;
                    350:
                    351:        /*
                    352:         * Get IP and UDP header together in first mbuf.
                    353:         */
                    354:        ip = mtod(m, struct ip *);
                    355:        IP6_EXTHDR_GET(uh, struct udphdr *, m, iphlen, sizeof(struct udphdr));
                    356:        if (uh == NULL) {
                    357:                udpstat.udps_hdrops++;
                    358:                return;
                    359:        }
1.95      thorpej   360:        KASSERT(UDP_HDR_ALIGNED_P(uh));
1.53      itojun    361:
1.57      itojun    362:        /* destination port of 0 is illegal, based on RFC768. */
                    363:        if (uh->uh_dport == 0)
                    364:                goto bad;
                    365:
1.53      itojun    366:        /*
                    367:         * Make mbuf data length reflect UDP length.
                    368:         * If not enough data to reflect UDP length, drop.
                    369:         */
1.96      itojun    370:        ip_len = ntohs(ip->ip_len);
1.53      itojun    371:        len = ntohs((u_int16_t)uh->uh_ulen);
1.96      itojun    372:        if (ip_len != iphlen + len) {
                    373:                if (ip_len < iphlen + len || len < sizeof(struct udphdr)) {
1.53      itojun    374:                        udpstat.udps_badlen++;
                    375:                        goto bad;
                    376:                }
1.96      itojun    377:                m_adj(m, iphlen + len - ip_len);
1.53      itojun    378:        }
                    379:
                    380:        /*
                    381:         * Checksum extended UDP header and data.
                    382:         */
1.129     yamt      383:        if (udp4_input_checksum(m, uh, iphlen, len))
                    384:                goto badcsum;
1.53      itojun    385:
                    386:        /* construct source and dst sockaddrs. */
1.159     dyoung    387:        sockaddr_in_init(&src, &ip->ip_src, uh->uh_sport);
                    388:        sockaddr_in_init(&dst, &ip->ip_dst, uh->uh_dport);
1.53      itojun    389:
1.144     manu      390:        if ((n = udp4_realinput(&src, &dst, &m, iphlen)) == -1) {
                    391:                udpstat.udps_hdrops++;
                    392:                return;
                    393:        }
1.53      itojun    394: #ifdef INET6
                    395:        if (IN_MULTICAST(ip->ip_dst.s_addr) || n == 0) {
                    396:                struct sockaddr_in6 src6, dst6;
                    397:
                    398:                bzero(&src6, sizeof(src6));
                    399:                src6.sin6_family = AF_INET6;
                    400:                src6.sin6_len = sizeof(struct sockaddr_in6);
                    401:                src6.sin6_addr.s6_addr[10] = src6.sin6_addr.s6_addr[11] = 0xff;
                    402:                bcopy(&ip->ip_src, &src6.sin6_addr.s6_addr[12],
                    403:                        sizeof(ip->ip_src));
                    404:                src6.sin6_port = uh->uh_sport;
                    405:                bzero(&dst6, sizeof(dst6));
                    406:                dst6.sin6_family = AF_INET6;
                    407:                dst6.sin6_len = sizeof(struct sockaddr_in6);
                    408:                dst6.sin6_addr.s6_addr[10] = dst6.sin6_addr.s6_addr[11] = 0xff;
                    409:                bcopy(&ip->ip_dst, &dst6.sin6_addr.s6_addr[12],
                    410:                        sizeof(ip->ip_dst));
                    411:                dst6.sin6_port = uh->uh_dport;
                    412:
                    413:                n += udp6_realinput(AF_INET, &src6, &dst6, m, iphlen);
                    414:        }
                    415: #endif
                    416:
                    417:        if (n == 0) {
                    418:                if (m->m_flags & (M_BCAST | M_MCAST)) {
                    419:                        udpstat.udps_noportbcast++;
                    420:                        goto bad;
                    421:                }
1.61      itojun    422:                udpstat.udps_noport++;
1.64      ws        423: #ifdef IPKDB
1.53      itojun    424:                if (checkipkdb(&ip->ip_src, uh->uh_sport, uh->uh_dport,
                    425:                                m, iphlen + sizeof(struct udphdr),
                    426:                                m->m_pkthdr.len - iphlen - sizeof(struct udphdr))) {
                    427:                        /*
                    428:                         * It was a debugger connect packet,
                    429:                         * just drop it now
                    430:                         */
                    431:                        goto bad;
                    432:                }
                    433: #endif
                    434:                icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0);
                    435:                m = NULL;
                    436:        }
                    437:
                    438: bad:
                    439:        if (m)
                    440:                m_freem(m);
1.78      thorpej   441:        return;
                    442:
                    443: badcsum:
                    444:        m_freem(m);
1.53      itojun    445: }
1.72      itojun    446: #endif
1.53      itojun    447:
                    448: #ifdef INET6
1.129     yamt      449: static int
                    450: udp6_input_checksum(struct mbuf *m, const struct udphdr *uh, int off, int len)
                    451: {
                    452:
1.140     yamt      453:        /*
                    454:         * XXX it's better to record and check if this mbuf is
                    455:         * already checked.
                    456:         */
                    457:
1.129     yamt      458:        if (__predict_false((m->m_flags & M_LOOP) && !udp_do_loopback_cksum)) {
                    459:                goto good;
                    460:        }
                    461:        if (uh->uh_sum == 0) {
                    462:                udp6stat.udp6s_nosum++;
                    463:                goto bad;
                    464:        }
1.140     yamt      465:
                    466:        switch (m->m_pkthdr.csum_flags &
                    467:            ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_UDPv6) |
                    468:            M_CSUM_TCP_UDP_BAD | M_CSUM_DATA)) {
                    469:        case M_CSUM_UDPv6|M_CSUM_TCP_UDP_BAD:
                    470:                UDP_CSUM_COUNTER_INCR(&udp6_hwcsum_bad);
1.129     yamt      471:                udp6stat.udp6s_badsum++;
                    472:                goto bad;
1.140     yamt      473:
                    474: #if 0 /* notyet */
                    475:        case M_CSUM_UDPv6|M_CSUM_DATA:
                    476: #endif
                    477:
                    478:        case M_CSUM_UDPv6:
                    479:                /* Checksum was okay. */
                    480:                UDP_CSUM_COUNTER_INCR(&udp6_hwcsum_ok);
                    481:                break;
                    482:
                    483:        default:
                    484:                /*
                    485:                 * Need to compute it ourselves.  Maybe skip checksum
                    486:                 * on loopback interfaces.
                    487:                 */
                    488:                UDP_CSUM_COUNTER_INCR(&udp6_swcsum);
                    489:                if (in6_cksum(m, IPPROTO_UDP, off, len) != 0) {
                    490:                        udp6stat.udp6s_badsum++;
                    491:                        goto bad;
                    492:                }
1.129     yamt      493:        }
                    494:
                    495: good:
                    496:        return 0;
                    497: bad:
                    498:        return -1;
                    499: }
                    500:
1.53      itojun    501: int
1.154     yamt      502: udp6_input(struct mbuf **mp, int *offp, int proto)
1.53      itojun    503: {
                    504:        struct mbuf *m = *mp;
                    505:        int off = *offp;
                    506:        struct sockaddr_in6 src, dst;
                    507:        struct ip6_hdr *ip6;
                    508:        struct udphdr *uh;
                    509:        u_int32_t plen, ulen;
                    510:
1.76      itojun    511:        ip6 = mtod(m, struct ip6_hdr *);
                    512:
1.53      itojun    513: #if defined(NFAITH) && 0 < NFAITH
1.76      itojun    514:        if (faithprefix(&ip6->ip6_dst)) {
                    515:                /* send icmp6 host unreach? */
                    516:                m_freem(m);
                    517:                return IPPROTO_DONE;
1.53      itojun    518:        }
                    519: #endif
                    520:
                    521:        udp6stat.udp6s_ipackets++;
                    522:
                    523:        /* check for jumbogram is done in ip6_input.  we can trust pkthdr.len */
                    524:        plen = m->m_pkthdr.len - off;
                    525:        IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(struct udphdr));
                    526:        if (uh == NULL) {
                    527:                ip6stat.ip6s_tooshort++;
                    528:                return IPPROTO_DONE;
                    529:        }
1.95      thorpej   530:        KASSERT(UDP_HDR_ALIGNED_P(uh));
1.53      itojun    531:        ulen = ntohs((u_short)uh->uh_ulen);
1.69      itojun    532:        /*
                    533:         * RFC2675 section 4: jumbograms will have 0 in the UDP header field,
                    534:         * iff payload length > 0xffff.
                    535:         */
1.53      itojun    536:        if (ulen == 0 && plen > 0xffff)
                    537:                ulen = plen;
                    538:
                    539:        if (plen != ulen) {
                    540:                udp6stat.udp6s_badlen++;
1.54      itojun    541:                goto bad;
                    542:        }
                    543:
1.57      itojun    544:        /* destination port of 0 is illegal, based on RFC768. */
                    545:        if (uh->uh_dport == 0)
                    546:                goto bad;
                    547:
1.54      itojun    548:        /* Be proactive about malicious use of IPv4 mapped address */
                    549:        if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
                    550:            IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
                    551:                /* XXX stat */
1.53      itojun    552:                goto bad;
                    553:        }
                    554:
                    555:        /*
1.125     thorpej   556:         * Checksum extended UDP header and data.  Maybe skip checksum
                    557:         * on loopback interfaces.
1.53      itojun    558:         */
1.129     yamt      559:        if (udp6_input_checksum(m, uh, off, ulen))
                    560:                goto bad;
1.53      itojun    561:
                    562:        /*
                    563:         * Construct source and dst sockaddrs.
                    564:         */
                    565:        bzero(&src, sizeof(src));
                    566:        src.sin6_family = AF_INET6;
                    567:        src.sin6_len = sizeof(struct sockaddr_in6);
1.146     rpaulo    568:        src.sin6_addr = ip6->ip6_src;
1.53      itojun    569:        src.sin6_port = uh->uh_sport;
                    570:        bzero(&dst, sizeof(dst));
                    571:        dst.sin6_family = AF_INET6;
                    572:        dst.sin6_len = sizeof(struct sockaddr_in6);
1.146     rpaulo    573:        dst.sin6_addr = ip6->ip6_dst;
1.53      itojun    574:        dst.sin6_port = uh->uh_dport;
                    575:
                    576:        if (udp6_realinput(AF_INET6, &src, &dst, m, off) == 0) {
                    577:                if (m->m_flags & M_MCAST) {
                    578:                        udp6stat.udp6s_noportmcast++;
                    579:                        goto bad;
                    580:                }
1.61      itojun    581:                udp6stat.udp6s_noport++;
1.53      itojun    582:                icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
                    583:                m = NULL;
                    584:        }
                    585:
                    586: bad:
                    587:        if (m)
                    588:                m_freem(m);
                    589:        return IPPROTO_DONE;
                    590: }
                    591: #endif
                    592:
1.72      itojun    593: #ifdef INET
1.53      itojun    594: static void
1.119     matt      595: udp4_sendup(struct mbuf *m, int off /* offset of data portion */,
                    596:        struct sockaddr *src, struct socket *so)
1.53      itojun    597: {
                    598:        struct mbuf *opts = NULL;
                    599:        struct mbuf *n;
                    600:        struct inpcb *inp = NULL;
                    601:
                    602:        if (!so)
                    603:                return;
                    604:        switch (so->so_proto->pr_domain->dom_family) {
                    605:        case AF_INET:
                    606:                inp = sotoinpcb(so);
                    607:                break;
                    608: #ifdef INET6
                    609:        case AF_INET6:
                    610:                break;
                    611: #endif
                    612:        default:
                    613:                return;
                    614:        }
                    615:
1.105     jonathan  616: #if defined(IPSEC) || defined(FAST_IPSEC)
1.53      itojun    617:        /* check AH/ESP integrity. */
                    618:        if (so != NULL && ipsec4_in_reject_so(m, so)) {
                    619:                ipsecstat.in_polvio++;
1.162     dyoung    620:                if ((n = m_copypacket(m, M_DONTWAIT)) != NULL)
1.110     itojun    621:                        icmp_error(n, ICMP_UNREACH, ICMP_UNREACH_ADMIN_PROHIBIT,
                    622:                            0, 0);
1.53      itojun    623:                return;
                    624:        }
                    625: #endif /*IPSEC*/
                    626:
1.162     dyoung    627:        if ((n = m_copypacket(m, M_DONTWAIT)) != NULL) {
1.53      itojun    628:                if (inp && (inp->inp_flags & INP_CONTROLOPTS
                    629:                         || so->so_options & SO_TIMESTAMP)) {
                    630:                        struct ip *ip = mtod(n, struct ip *);
                    631:                        ip_savecontrol(inp, &opts, ip, n);
                    632:                }
                    633:
                    634:                m_adj(n, off);
                    635:                if (sbappendaddr(&so->so_rcv, src, n,
                    636:                                opts) == 0) {
                    637:                        m_freem(n);
                    638:                        if (opts)
                    639:                                m_freem(opts);
1.124     darrenr   640:                        so->so_rcv.sb_overflowed++;
1.81      enami     641:                        udpstat.udps_fullsock++;
1.53      itojun    642:                } else
                    643:                        sorwakeup(so);
                    644:        }
                    645: }
1.72      itojun    646: #endif
1.53      itojun    647:
                    648: #ifdef INET6
                    649: static void
1.119     matt      650: udp6_sendup(struct mbuf *m, int off /* offset of data portion */,
                    651:        struct sockaddr *src, struct socket *so)
1.53      itojun    652: {
                    653:        struct mbuf *opts = NULL;
                    654:        struct mbuf *n;
                    655:        struct in6pcb *in6p = NULL;
                    656:
                    657:        if (!so)
                    658:                return;
                    659:        if (so->so_proto->pr_domain->dom_family != AF_INET6)
                    660:                return;
                    661:        in6p = sotoin6pcb(so);
                    662:
1.105     jonathan  663: #if defined(IPSEC) || defined(FAST_IPSEC)
1.53      itojun    664:        /* check AH/ESP integrity. */
                    665:        if (so != NULL && ipsec6_in_reject_so(m, so)) {
                    666:                ipsec6stat.in_polvio++;
1.162     dyoung    667:                if ((n = m_copypacket(m, M_DONTWAIT)) != NULL)
1.110     itojun    668:                        icmp6_error(n, ICMP6_DST_UNREACH,
                    669:                            ICMP6_DST_UNREACH_ADMIN, 0);
1.53      itojun    670:                return;
                    671:        }
                    672: #endif /*IPSEC*/
                    673:
1.162     dyoung    674:        if ((n = m_copypacket(m, M_DONTWAIT)) != NULL) {
1.53      itojun    675:                if (in6p && (in6p->in6p_flags & IN6P_CONTROLOPTS
                    676:                          || in6p->in6p_socket->so_options & SO_TIMESTAMP)) {
                    677:                        struct ip6_hdr *ip6 = mtod(n, struct ip6_hdr *);
                    678:                        ip6_savecontrol(in6p, &opts, ip6, n);
                    679:                }
                    680:
                    681:                m_adj(n, off);
                    682:                if (sbappendaddr(&so->so_rcv, src, n, opts) == 0) {
                    683:                        m_freem(n);
                    684:                        if (opts)
                    685:                                m_freem(opts);
1.124     darrenr   686:                        so->so_rcv.sb_overflowed++;
1.53      itojun    687:                        udp6stat.udp6s_fullsock++;
                    688:                } else
                    689:                        sorwakeup(so);
                    690:        }
                    691: }
                    692: #endif
                    693:
1.72      itojun    694: #ifdef INET
1.53      itojun    695: static int
1.119     matt      696: udp4_realinput(struct sockaddr_in *src, struct sockaddr_in *dst,
1.144     manu      697:        struct mbuf **mp, int off /* offset of udphdr */)
1.53      itojun    698: {
                    699:        u_int16_t *sport, *dport;
                    700:        int rcvcnt;
                    701:        struct in_addr *src4, *dst4;
1.109     itojun    702:        struct inpcb_hdr *inph;
1.53      itojun    703:        struct inpcb *inp;
1.144     manu      704:        struct mbuf *m = *mp;
1.53      itojun    705:
                    706:        rcvcnt = 0;
                    707:        off += sizeof(struct udphdr);   /* now, offset of payload */
                    708:
                    709:        if (src->sin_family != AF_INET || dst->sin_family != AF_INET)
                    710:                goto bad;
                    711:
                    712:        src4 = &src->sin_addr;
                    713:        sport = &src->sin_port;
                    714:        dst4 = &dst->sin_addr;
                    715:        dport = &dst->sin_port;
                    716:
1.73      itojun    717:        if (IN_MULTICAST(dst4->s_addr) ||
1.53      itojun    718:            in_broadcast(*dst4, m->m_pkthdr.rcvif)) {
                    719:                /*
                    720:                 * Deliver a multicast or broadcast datagram to *all* sockets
                    721:                 * for which the local and remote addresses and ports match
                    722:                 * those of the incoming datagram.  This allows more than
                    723:                 * one process to receive multi/broadcasts on the same port.
                    724:                 * (This really ought to be done for unicast datagrams as
                    725:                 * well, but that would cause problems with existing
                    726:                 * applications that open both address-specific sockets and
                    727:                 * a wildcard socket listening to the same port -- they would
                    728:                 * end up receiving duplicates of every unicast datagram.
                    729:                 * Those applications open the multiple sockets to overcome an
                    730:                 * inadequacy of the UDP socket interface, but for backwards
                    731:                 * compatibility we avoid the problem here rather than
                    732:                 * fixing the interface.  Maybe 4.5BSD will remedy this?)
                    733:                 */
                    734:
                    735:                /*
1.92      itojun    736:                 * KAME note: traditionally we dropped udpiphdr from mbuf here.
1.71      itojun    737:                 * we need udpiphdr for IPsec processing so we do that later.
1.53      itojun    738:                 */
                    739:                /*
                    740:                 * Locate pcb(s) for datagram.
                    741:                 */
1.109     itojun    742:                CIRCLEQ_FOREACH(inph, &udbtable.inpt_queue, inph_queue) {
                    743:                        inp = (struct inpcb *)inph;
                    744:                        if (inp->inp_af != AF_INET)
                    745:                                continue;
                    746:
1.53      itojun    747:                        if (inp->inp_lport != *dport)
                    748:                                continue;
                    749:                        if (!in_nullhost(inp->inp_laddr)) {
                    750:                                if (!in_hosteq(inp->inp_laddr, *dst4))
                    751:                                        continue;
                    752:                        }
                    753:                        if (!in_nullhost(inp->inp_faddr)) {
                    754:                                if (!in_hosteq(inp->inp_faddr, *src4) ||
                    755:                                    inp->inp_fport != *sport)
                    756:                                        continue;
                    757:                        }
                    758:
                    759:                        udp4_sendup(m, off, (struct sockaddr *)src,
                    760:                                inp->inp_socket);
                    761:                        rcvcnt++;
                    762:
                    763:                        /*
                    764:                         * Don't look for additional matches if this one does
                    765:                         * not have either the SO_REUSEPORT or SO_REUSEADDR
                    766:                         * socket options set.  This heuristic avoids searching
                    767:                         * through all pcbs in the common case of a non-shared
                    768:                         * port.  It assumes that an application will never
                    769:                         * clear these options after setting them.
                    770:                         */
                    771:                        if ((inp->inp_socket->so_options &
                    772:                            (SO_REUSEPORT|SO_REUSEADDR)) == 0)
                    773:                                break;
                    774:                }
                    775:        } else {
                    776:                /*
                    777:                 * Locate pcb for datagram.
                    778:                 */
                    779:                inp = in_pcblookup_connect(&udbtable, *src4, *sport, *dst4, *dport);
                    780:                if (inp == 0) {
                    781:                        ++udpstat.udps_pcbhashmiss;
                    782:                        inp = in_pcblookup_bind(&udbtable, *dst4, *dport);
1.82      itojun    783:                        if (inp == 0)
1.53      itojun    784:                                return rcvcnt;
                    785:                }
                    786:
1.130     manu      787: #ifdef IPSEC_NAT_T
                    788:                /* Handle ESP over UDP */
                    789:                if (inp->inp_flags & INP_ESPINUDP_ALL) {
                    790:                        struct sockaddr *sa = (struct sockaddr *)src;
                    791:
1.144     manu      792:                        switch(udp4_espinudp(mp, off, sa, inp->inp_socket)) {
                    793:                        case -1:        /* Error, m was freeed */
                    794:                                rcvcnt = -1;
                    795:                                goto bad;
                    796:                                break;
                    797:
                    798:                        case 1:         /* ESP over UDP */
1.130     manu      799:                                rcvcnt++;
                    800:                                goto bad;
1.144     manu      801:                                break;
                    802:
                    803:                        case 0:         /* plain UDP */
                    804:                        default:        /* Unexpected */
                    805:                                /*
                    806:                                 * Normal UDP processing will take place
                    807:                                 * m may have changed.
                    808:                                 */
                    809:                                m = *mp;
                    810:                                break;
1.130     manu      811:                        }
                    812:                }
                    813: #endif
                    814:
1.53      itojun    815:                udp4_sendup(m, off, (struct sockaddr *)src, inp->inp_socket);
                    816:                rcvcnt++;
                    817:        }
                    818:
                    819: bad:
                    820:        return rcvcnt;
                    821: }
1.72      itojun    822: #endif
1.53      itojun    823:
                    824: #ifdef INET6
                    825: static int
1.119     matt      826: udp6_realinput(int af, struct sockaddr_in6 *src, struct sockaddr_in6 *dst,
                    827:        struct mbuf *m, int off)
1.53      itojun    828: {
1.79      itojun    829:        u_int16_t sport, dport;
1.53      itojun    830:        int rcvcnt;
1.146     rpaulo    831:        struct in6_addr src6, *dst6;
1.79      itojun    832:        const struct in_addr *dst4;
1.109     itojun    833:        struct inpcb_hdr *inph;
1.53      itojun    834:        struct in6pcb *in6p;
                    835:
                    836:        rcvcnt = 0;
                    837:        off += sizeof(struct udphdr);   /* now, offset of payload */
                    838:
                    839:        if (af != AF_INET && af != AF_INET6)
                    840:                goto bad;
                    841:        if (src->sin6_family != AF_INET6 || dst->sin6_family != AF_INET6)
                    842:                goto bad;
                    843:
1.146     rpaulo    844:        src6 = src->sin6_addr;
                    845:        if (sa6_recoverscope(src) != 0) {
                    846:                /* XXX: should be impossible. */
                    847:                goto bad;
                    848:        }
1.79      itojun    849:        sport = src->sin6_port;
1.146     rpaulo    850:
1.79      itojun    851:        dport = dst->sin6_port;
1.88      itojun    852:        dst4 = (struct in_addr *)&dst->sin6_addr.s6_addr[12];
1.146     rpaulo    853:        dst6 = &dst->sin6_addr;
1.53      itojun    854:
1.146     rpaulo    855:        if (IN6_IS_ADDR_MULTICAST(dst6) ||
1.79      itojun    856:            (af == AF_INET && IN_MULTICAST(dst4->s_addr))) {
1.53      itojun    857:                /*
                    858:                 * Deliver a multicast or broadcast datagram to *all* sockets
                    859:                 * for which the local and remote addresses and ports match
                    860:                 * those of the incoming datagram.  This allows more than
                    861:                 * one process to receive multi/broadcasts on the same port.
                    862:                 * (This really ought to be done for unicast datagrams as
                    863:                 * well, but that would cause problems with existing
                    864:                 * applications that open both address-specific sockets and
                    865:                 * a wildcard socket listening to the same port -- they would
                    866:                 * end up receiving duplicates of every unicast datagram.
                    867:                 * Those applications open the multiple sockets to overcome an
                    868:                 * inadequacy of the UDP socket interface, but for backwards
                    869:                 * compatibility we avoid the problem here rather than
                    870:                 * fixing the interface.  Maybe 4.5BSD will remedy this?)
                    871:                 */
                    872:
                    873:                /*
1.92      itojun    874:                 * KAME note: traditionally we dropped udpiphdr from mbuf here.
1.71      itojun    875:                 * we need udpiphdr for IPsec processing so we do that later.
1.53      itojun    876:                 */
                    877:                /*
                    878:                 * Locate pcb(s) for datagram.
                    879:                 */
1.109     itojun    880:                CIRCLEQ_FOREACH(inph, &udbtable.inpt_queue, inph_queue) {
                    881:                        in6p = (struct in6pcb *)inph;
                    882:                        if (in6p->in6p_af != AF_INET6)
                    883:                                continue;
                    884:
1.79      itojun    885:                        if (in6p->in6p_lport != dport)
1.53      itojun    886:                                continue;
                    887:                        if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) {
1.146     rpaulo    888:                                if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr,
                    889:                                    dst6))
1.53      itojun    890:                                        continue;
1.92      itojun    891:                        } else {
1.146     rpaulo    892:                                if (IN6_IS_ADDR_V4MAPPED(dst6) &&
1.85      itojun    893:                                    (in6p->in6p_flags & IN6P_IPV6_V6ONLY))
1.55      itojun    894:                                        continue;
                    895:                        }
1.53      itojun    896:                        if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
1.79      itojun    897:                                if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr,
                    898:                                    &src6) || in6p->in6p_fport != sport)
1.53      itojun    899:                                        continue;
1.92      itojun    900:                        } else {
1.79      itojun    901:                                if (IN6_IS_ADDR_V4MAPPED(&src6) &&
1.85      itojun    902:                                    (in6p->in6p_flags & IN6P_IPV6_V6ONLY))
1.55      itojun    903:                                        continue;
                    904:                        }
1.53      itojun    905:
                    906:                        udp6_sendup(m, off, (struct sockaddr *)src,
                    907:                                in6p->in6p_socket);
                    908:                        rcvcnt++;
                    909:
                    910:                        /*
                    911:                         * Don't look for additional matches if this one does
                    912:                         * not have either the SO_REUSEPORT or SO_REUSEADDR
                    913:                         * socket options set.  This heuristic avoids searching
                    914:                         * through all pcbs in the common case of a non-shared
                    915:                         * port.  It assumes that an application will never
                    916:                         * clear these options after setting them.
                    917:                         */
                    918:                        if ((in6p->in6p_socket->so_options &
                    919:                            (SO_REUSEPORT|SO_REUSEADDR)) == 0)
                    920:                                break;
                    921:                }
                    922:        } else {
                    923:                /*
                    924:                 * Locate pcb for datagram.
                    925:                 */
1.146     rpaulo    926:                in6p = in6_pcblookup_connect(&udbtable, &src6, sport, dst6,
                    927:                    dport, 0);
1.53      itojun    928:                if (in6p == 0) {
                    929:                        ++udpstat.udps_pcbhashmiss;
1.146     rpaulo    930:                        in6p = in6_pcblookup_bind(&udbtable, dst6, dport, 0);
1.82      itojun    931:                        if (in6p == 0)
1.53      itojun    932:                                return rcvcnt;
                    933:                }
                    934:
                    935:                udp6_sendup(m, off, (struct sockaddr *)src, in6p->in6p_socket);
                    936:                rcvcnt++;
                    937:        }
                    938:
                    939: bad:
                    940:        return rcvcnt;
                    941: }
                    942: #endif
1.1       cgd       943:
1.72      itojun    944: #ifdef INET
1.1       cgd       945: /*
                    946:  * Notify a udp user of an asynchronous error;
                    947:  * just wake up so that he can collect error status.
                    948:  */
1.7       mycroft   949: static void
1.119     matt      950: udp_notify(struct inpcb *inp, int errno)
1.1       cgd       951: {
                    952:        inp->inp_socket->so_error = errno;
                    953:        sorwakeup(inp->inp_socket);
                    954:        sowwakeup(inp->inp_socket);
                    955: }
                    956:
1.27      christos  957: void *
1.157     dyoung    958: udp_ctlinput(int cmd, const struct sockaddr *sa, void *v)
1.1       cgd       959: {
1.66      augustss  960:        struct ip *ip = v;
                    961:        struct udphdr *uh;
1.119     matt      962:        void (*notify)(struct inpcb *, int) = udp_notify;
1.21      mycroft   963:        int errno;
1.1       cgd       964:
1.53      itojun    965:        if (sa->sa_family != AF_INET
                    966:         || sa->sa_len != sizeof(struct sockaddr_in))
1.51      itojun    967:                return NULL;
1.20      mycroft   968:        if ((unsigned)cmd >= PRC_NCMDS)
1.27      christos  969:                return NULL;
1.20      mycroft   970:        errno = inetctlerrmap[cmd];
1.18      mycroft   971:        if (PRC_IS_REDIRECT(cmd))
1.19      mycroft   972:                notify = in_rtchange, ip = 0;
1.18      mycroft   973:        else if (cmd == PRC_HOSTDEAD)
1.19      mycroft   974:                ip = 0;
1.23      cgd       975:        else if (errno == 0)
1.27      christos  976:                return NULL;
1.19      mycroft   977:        if (ip) {
1.158     christos  978:                uh = (struct udphdr *)((char *)ip + (ip->ip_hl << 2));
1.157     dyoung    979:                in_pcbnotify(&udbtable, satocsin(sa)->sin_addr, uh->uh_dport,
1.34      mycroft   980:                    ip->ip_src, uh->uh_sport, errno, notify);
1.53      itojun    981:
                    982:                /* XXX mapped address case */
1.19      mycroft   983:        } else
1.157     dyoung    984:                in_pcbnotifyall(&udbtable, satocsin(sa)->sin_addr, errno,
1.34      mycroft   985:                    notify);
1.27      christos  986:        return NULL;
1.1       cgd       987: }
                    988:
1.7       mycroft   989: int
1.152     yamt      990: udp_ctloutput(int op, struct socket *so, int level, int optname,
                    991:     struct mbuf **mp)
1.130     manu      992: {
                    993:        int s;
                    994:        int error = 0;
                    995:        struct mbuf *m;
                    996:        struct inpcb *inp;
                    997:        int family;
                    998:
                    999:        family = so->so_proto->pr_domain->dom_family;
                   1000:
                   1001:        s = splsoftnet();
                   1002:        switch (family) {
                   1003: #ifdef INET
                   1004:        case PF_INET:
                   1005:                if (level != IPPROTO_UDP) {
                   1006:                        error = ip_ctloutput(op, so, level, optname, mp);
                   1007:                        goto end;
                   1008:                }
                   1009:                break;
                   1010: #endif
                   1011: #ifdef INET6
                   1012:        case PF_INET6:
                   1013:                if (level != IPPROTO_UDP) {
                   1014:                        error = ip6_ctloutput(op, so, level, optname, mp);
                   1015:                        goto end;
                   1016:                }
                   1017:                break;
                   1018: #endif
                   1019:        default:
                   1020:                error = EAFNOSUPPORT;
                   1021:                goto end;
                   1022:        }
                   1023:
                   1024:
                   1025:        switch (op) {
                   1026:        case PRCO_SETOPT:
                   1027:                m = *mp;
                   1028:                inp = sotoinpcb(so);
                   1029:
                   1030:                switch (optname) {
                   1031:                case UDP_ENCAP:
1.162.6.1! mjf      1032:                        if (m == NULL || m->m_len != sizeof(int)) {
1.130     manu     1033:                                error = EINVAL;
1.153     yamt     1034:                                break;
1.130     manu     1035:                        }
1.131     perry    1036:
1.130     manu     1037:                        switch(*mtod(m, int *)) {
                   1038: #ifdef IPSEC_NAT_T
                   1039:                        case 0:
                   1040:                                inp->inp_flags &= ~INP_ESPINUDP_ALL;
                   1041:                                break;
                   1042:
                   1043:                        case UDP_ENCAP_ESPINUDP:
                   1044:                                inp->inp_flags &= ~INP_ESPINUDP_ALL;
                   1045:                                inp->inp_flags |= INP_ESPINUDP;
                   1046:                                break;
1.131     perry    1047:
1.130     manu     1048:                        case UDP_ENCAP_ESPINUDP_NON_IKE:
                   1049:                                inp->inp_flags &= ~INP_ESPINUDP_ALL;
                   1050:                                inp->inp_flags |= INP_ESPINUDP_NON_IKE;
                   1051:                                break;
                   1052: #endif
                   1053:                        default:
                   1054:                                error = EINVAL;
                   1055:                                break;
                   1056:                        }
                   1057:                        break;
                   1058:
                   1059:                default:
                   1060:                        error = ENOPROTOOPT;
                   1061:                        break;
                   1062:                }
1.155     yamt     1063:                if (m != NULL) {
                   1064:                        m_free(m);
                   1065:                }
1.130     manu     1066:                break;
                   1067:
                   1068:        default:
                   1069:                error = EINVAL;
                   1070:                break;
1.131     perry    1071:        }
                   1072:
1.130     manu     1073: end:
                   1074:        splx(s);
                   1075:        return error;
                   1076: }
1.131     perry    1077:
1.130     manu     1078:
                   1079: int
1.27      christos 1080: udp_output(struct mbuf *m, ...)
                   1081: {
1.66      augustss 1082:        struct inpcb *inp;
                   1083:        struct udpiphdr *ui;
1.125     thorpej  1084:        struct route *ro;
1.66      augustss 1085:        int len = m->m_pkthdr.len;
1.31      mycroft  1086:        int error = 0;
1.27      christos 1087:        va_list ap;
                   1088:
1.98      matt     1089:        MCLAIM(m, &udp_tx_mowner);
1.27      christos 1090:        va_start(ap, m);
                   1091:        inp = va_arg(ap, struct inpcb *);
                   1092:        va_end(ap);
1.1       cgd      1093:
                   1094:        /*
                   1095:         * Calculate data length and get a mbuf
                   1096:         * for UDP and IP headers.
                   1097:         */
1.13      mycroft  1098:        M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT);
                   1099:        if (m == 0) {
                   1100:                error = ENOBUFS;
1.39      thorpej  1101:                goto release;
                   1102:        }
                   1103:
                   1104:        /*
                   1105:         * Compute the packet length of the IP header, and
                   1106:         * punt if the length looks bogus.
                   1107:         */
1.96      itojun   1108:        if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) {
1.39      thorpej  1109:                error = EMSGSIZE;
1.13      mycroft  1110:                goto release;
                   1111:        }
1.1       cgd      1112:
                   1113:        /*
                   1114:         * Fill in mbuf with extended UDP header
                   1115:         * and addresses and length put into network format.
                   1116:         */
                   1117:        ui = mtod(m, struct udpiphdr *);
                   1118:        ui->ui_pr = IPPROTO_UDP;
                   1119:        ui->ui_src = inp->inp_laddr;
                   1120:        ui->ui_dst = inp->inp_faddr;
                   1121:        ui->ui_sport = inp->inp_lport;
                   1122:        ui->ui_dport = inp->inp_fport;
1.78      thorpej  1123:        ui->ui_ulen = htons((u_int16_t)len + sizeof(struct udphdr));
1.1       cgd      1124:
1.125     thorpej  1125:        ro = &inp->inp_route;
                   1126:
1.1       cgd      1127:        /*
1.78      thorpej  1128:         * Set up checksum and output datagram.
1.1       cgd      1129:         */
                   1130:        if (udpcksum) {
1.78      thorpej  1131:                /*
                   1132:                 * XXX Cache pseudo-header checksum part for
                   1133:                 * XXX "connected" UDP sockets.
                   1134:                 */
                   1135:                ui->ui_sum = in_cksum_phdr(ui->ui_src.s_addr,
                   1136:                    ui->ui_dst.s_addr, htons((u_int16_t)len +
                   1137:                    sizeof(struct udphdr) + IPPROTO_UDP));
1.135     yamt     1138:                m->m_pkthdr.csum_flags = M_CSUM_UDPv4;
1.78      thorpej  1139:                m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
                   1140:        } else
                   1141:                ui->ui_sum = 0;
1.96      itojun   1142:        ((struct ip *)ui)->ip_len = htons(sizeof (struct udpiphdr) + len);
1.1       cgd      1143:        ((struct ip *)ui)->ip_ttl = inp->inp_ip.ip_ttl; /* XXX */
                   1144:        ((struct ip *)ui)->ip_tos = inp->inp_ip.ip_tos; /* XXX */
                   1145:        udpstat.udps_opackets++;
1.48      itojun   1146:
1.125     thorpej  1147:        return (ip_output(m, inp->inp_options, ro,
1.12      mycroft  1148:            inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST),
1.107     itojun   1149:            inp->inp_moptions, inp->inp_socket));
1.1       cgd      1150:
                   1151: release:
                   1152:        m_freem(m);
                   1153:        return (error);
                   1154: }
                   1155:
1.42      thorpej  1156: int    udp_sendspace = 9216;           /* really max datagram size */
                   1157: int    udp_recvspace = 40 * (1024 + sizeof(struct sockaddr_in));
1.1       cgd      1158:                                        /* 40 1K datagrams */
                   1159:
                   1160: /*ARGSUSED*/
1.7       mycroft  1161: int
1.119     matt     1162: udp_usrreq(struct socket *so, int req, struct mbuf *m, struct mbuf *nam,
1.145     christos 1163:        struct mbuf *control, struct lwp *l)
1.1       cgd      1164: {
1.66      augustss 1165:        struct inpcb *inp;
1.1       cgd      1166:        int s;
1.66      augustss 1167:        int error = 0;
1.1       cgd      1168:
                   1169:        if (req == PRU_CONTROL)
1.158     christos 1170:                return (in_control(so, (long)m, (void *)nam,
1.148     ad       1171:                    (struct ifnet *)control, l));
1.59      thorpej  1172:
1.149     tls      1173:        s = splsoftnet();
                   1174:
1.60      thorpej  1175:        if (req == PRU_PURGEIF) {
1.80      itojun   1176:                in_pcbpurgeif0(&udbtable, (struct ifnet *)control);
1.60      thorpej  1177:                in_purgeif((struct ifnet *)control);
                   1178:                in_pcbpurgeif(&udbtable, (struct ifnet *)control);
1.149     tls      1179:                splx(s);
1.59      thorpej  1180:                return (0);
                   1181:        }
1.31      mycroft  1182:
                   1183:        inp = sotoinpcb(so);
1.32      mycroft  1184: #ifdef DIAGNOSTIC
                   1185:        if (req != PRU_SEND && req != PRU_SENDOOB && control)
                   1186:                panic("udp_usrreq: unexpected control mbuf");
                   1187: #endif
1.31      mycroft  1188:        if (inp == 0 && req != PRU_ATTACH) {
                   1189:                error = EINVAL;
                   1190:                goto release;
                   1191:        }
                   1192:
1.1       cgd      1193:        /*
                   1194:         * Note: need to block udp_input while changing
                   1195:         * the udp pcb queue and/or pcb addresses.
                   1196:         */
                   1197:        switch (req) {
                   1198:
                   1199:        case PRU_ATTACH:
1.31      mycroft  1200:                if (inp != 0) {
                   1201:                        error = EISCONN;
1.1       cgd      1202:                        break;
                   1203:                }
1.98      matt     1204: #ifdef MBUFTRACE
                   1205:                so->so_mowner = &udp_mowner;
                   1206:                so->so_rcv.sb_mowner = &udp_rx_mowner;
                   1207:                so->so_snd.sb_mowner = &udp_tx_mowner;
                   1208: #endif
1.31      mycroft  1209:                if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
                   1210:                        error = soreserve(so, udp_sendspace, udp_recvspace);
                   1211:                        if (error)
                   1212:                                break;
                   1213:                }
1.18      mycroft  1214:                error = in_pcballoc(so, &udbtable);
1.1       cgd      1215:                if (error)
                   1216:                        break;
1.31      mycroft  1217:                inp = sotoinpcb(so);
                   1218:                inp->inp_ip.ip_ttl = ip_defttl;
1.1       cgd      1219:                break;
                   1220:
                   1221:        case PRU_DETACH:
1.31      mycroft  1222:                in_pcbdetach(inp);
1.1       cgd      1223:                break;
                   1224:
                   1225:        case PRU_BIND:
1.148     ad       1226:                error = in_pcbbind(inp, nam, l);
1.1       cgd      1227:                break;
                   1228:
                   1229:        case PRU_LISTEN:
                   1230:                error = EOPNOTSUPP;
                   1231:                break;
                   1232:
                   1233:        case PRU_CONNECT:
1.148     ad       1234:                error = in_pcbconnect(inp, nam, l);
1.31      mycroft  1235:                if (error)
1.1       cgd      1236:                        break;
1.31      mycroft  1237:                soisconnected(so);
1.1       cgd      1238:                break;
                   1239:
                   1240:        case PRU_CONNECT2:
                   1241:                error = EOPNOTSUPP;
                   1242:                break;
                   1243:
                   1244:        case PRU_DISCONNECT:
1.31      mycroft  1245:                /*soisdisconnected(so);*/
                   1246:                so->so_state &= ~SS_ISCONNECTED;        /* XXX */
1.1       cgd      1247:                in_pcbdisconnect(inp);
1.34      mycroft  1248:                inp->inp_laddr = zeroin_addr;           /* XXX */
1.35      mycroft  1249:                in_pcbstate(inp, INP_BOUND);            /* XXX */
1.1       cgd      1250:                break;
                   1251:
                   1252:        case PRU_SHUTDOWN:
                   1253:                socantsendmore(so);
                   1254:                break;
                   1255:
1.31      mycroft  1256:        case PRU_RCVD:
                   1257:                error = EOPNOTSUPP;
1.1       cgd      1258:                break;
                   1259:
1.31      mycroft  1260:        case PRU_SEND:
1.32      mycroft  1261:                if (control && control->m_len) {
                   1262:                        m_freem(control);
                   1263:                        m_freem(m);
                   1264:                        error = EINVAL;
                   1265:                        break;
                   1266:                }
1.31      mycroft  1267:        {
1.35      mycroft  1268:                struct in_addr laddr;                   /* XXX */
1.1       cgd      1269:
1.31      mycroft  1270:                if (nam) {
1.35      mycroft  1271:                        laddr = inp->inp_laddr;         /* XXX */
1.31      mycroft  1272:                        if ((so->so_state & SS_ISCONNECTED) != 0) {
                   1273:                                error = EISCONN;
1.32      mycroft  1274:                                goto die;
1.31      mycroft  1275:                        }
1.148     ad       1276:                        error = in_pcbconnect(inp, nam, l);
1.100     matt     1277:                        if (error)
                   1278:                                goto die;
1.31      mycroft  1279:                } else {
                   1280:                        if ((so->so_state & SS_ISCONNECTED) == 0) {
                   1281:                                error = ENOTCONN;
1.32      mycroft  1282:                                goto die;
1.31      mycroft  1283:                        }
                   1284:                }
1.33      mycroft  1285:                error = udp_output(m, inp);
1.100     matt     1286:                m = NULL;
1.31      mycroft  1287:                if (nam) {
                   1288:                        in_pcbdisconnect(inp);
1.35      mycroft  1289:                        inp->inp_laddr = laddr;         /* XXX */
                   1290:                        in_pcbstate(inp, INP_BOUND);    /* XXX */
1.31      mycroft  1291:                }
1.100     matt     1292:          die:
                   1293:                if (m)
                   1294:                        m_freem(m);
1.31      mycroft  1295:        }
1.1       cgd      1296:                break;
                   1297:
                   1298:        case PRU_SENSE:
                   1299:                /*
                   1300:                 * stat: don't bother with a blocksize.
                   1301:                 */
1.31      mycroft  1302:                splx(s);
1.1       cgd      1303:                return (0);
                   1304:
1.31      mycroft  1305:        case PRU_RCVOOB:
                   1306:                error =  EOPNOTSUPP;
                   1307:                break;
                   1308:
1.1       cgd      1309:        case PRU_SENDOOB:
1.32      mycroft  1310:                m_freem(control);
1.31      mycroft  1311:                m_freem(m);
1.1       cgd      1312:                error =  EOPNOTSUPP;
                   1313:                break;
                   1314:
1.31      mycroft  1315:        case PRU_SOCKADDR:
                   1316:                in_setsockaddr(inp, nam);
                   1317:                break;
                   1318:
                   1319:        case PRU_PEERADDR:
                   1320:                in_setpeeraddr(inp, nam);
                   1321:                break;
1.1       cgd      1322:
                   1323:        default:
                   1324:                panic("udp_usrreq");
                   1325:        }
                   1326:
                   1327: release:
1.31      mycroft  1328:        splx(s);
1.1       cgd      1329:        return (error);
1.13      mycroft  1330: }
                   1331:
                   1332: /*
                   1333:  * Sysctl for udp variables.
                   1334:  */
1.114     atatat   1335: SYSCTL_SETUP(sysctl_net_inet_udp_setup, "sysctl net.inet.udp subtree setup")
1.13      mycroft  1336: {
1.114     atatat   1337:
1.116     atatat   1338:        sysctl_createv(clog, 0, NULL, NULL,
                   1339:                       CTLFLAG_PERMANENT,
1.114     atatat   1340:                       CTLTYPE_NODE, "net", NULL,
                   1341:                       NULL, 0, NULL, 0,
                   1342:                       CTL_NET, CTL_EOL);
1.116     atatat   1343:        sysctl_createv(clog, 0, NULL, NULL,
                   1344:                       CTLFLAG_PERMANENT,
1.114     atatat   1345:                       CTLTYPE_NODE, "inet", NULL,
                   1346:                       NULL, 0, NULL, 0,
                   1347:                       CTL_NET, PF_INET, CTL_EOL);
1.116     atatat   1348:        sysctl_createv(clog, 0, NULL, NULL,
                   1349:                       CTLFLAG_PERMANENT,
1.122     atatat   1350:                       CTLTYPE_NODE, "udp",
                   1351:                       SYSCTL_DESCR("UDPv4 related settings"),
1.114     atatat   1352:                       NULL, 0, NULL, 0,
                   1353:                       CTL_NET, PF_INET, IPPROTO_UDP, CTL_EOL);
                   1354:
1.116     atatat   1355:        sysctl_createv(clog, 0, NULL, NULL,
                   1356:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.122     atatat   1357:                       CTLTYPE_INT, "checksum",
1.123     heas     1358:                       SYSCTL_DESCR("Compute UDP checksums"),
1.114     atatat   1359:                       NULL, 0, &udpcksum, 0,
                   1360:                       CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_CHECKSUM,
                   1361:                       CTL_EOL);
1.116     atatat   1362:        sysctl_createv(clog, 0, NULL, NULL,
                   1363:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.122     atatat   1364:                       CTLTYPE_INT, "sendspace",
                   1365:                       SYSCTL_DESCR("Default UDP send buffer size"),
1.114     atatat   1366:                       NULL, 0, &udp_sendspace, 0,
                   1367:                       CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_SENDSPACE,
                   1368:                       CTL_EOL);
1.116     atatat   1369:        sysctl_createv(clog, 0, NULL, NULL,
                   1370:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.122     atatat   1371:                       CTLTYPE_INT, "recvspace",
                   1372:                       SYSCTL_DESCR("Default UDP receive buffer size"),
1.114     atatat   1373:                       NULL, 0, &udp_recvspace, 0,
                   1374:                       CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_RECVSPACE,
                   1375:                       CTL_EOL);
1.125     thorpej  1376:        sysctl_createv(clog, 0, NULL, NULL,
                   1377:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1378:                       CTLTYPE_INT, "do_loopback_cksum",
                   1379:                       SYSCTL_DESCR("Perform UDP checksum on loopback"),
                   1380:                       NULL, 0, &udp_do_loopback_cksum, 0,
                   1381:                       CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_LOOPBACKCKSUM,
                   1382:                       CTL_EOL);
1.132     atatat   1383:        sysctl_createv(clog, 0, NULL, NULL,
                   1384:                       CTLFLAG_PERMANENT,
1.134     atatat   1385:                       CTLTYPE_STRUCT, "pcblist",
1.132     atatat   1386:                       SYSCTL_DESCR("UDP protocol control block list"),
                   1387:                       sysctl_inpcblist, 0, &udbtable, 0,
                   1388:                       CTL_NET, PF_INET, IPPROTO_UDP, CTL_CREATE,
                   1389:                       CTL_EOL);
1.139     elad     1390:        sysctl_createv(clog, 0, NULL, NULL,
                   1391:                       CTLFLAG_PERMANENT,
                   1392:                       CTLTYPE_STRUCT, "stats",
                   1393:                       SYSCTL_DESCR("UDP statistics"),
                   1394:                       NULL, 0, &udpstat, sizeof(udpstat),
                   1395:                       CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_STATS,
                   1396:                       CTL_EOL);
1.1       cgd      1397: }
1.72      itojun   1398: #endif
1.130     manu     1399:
                   1400: #if (defined INET && defined IPSEC_NAT_T)
                   1401: /*
                   1402:  * Returns:
                   1403:  * 1 if the packet was processed
                   1404:  * 0 if normal UDP processing should take place
1.144     manu     1405:  * -1 if an error occurent and m was freed
1.130     manu     1406:  */
                   1407: static int
1.154     yamt     1408: udp4_espinudp(struct mbuf **mp, int off, struct sockaddr *src,
1.151     christos 1409:     struct socket *so)
1.130     manu     1410: {
                   1411:        size_t len;
1.158     christos 1412:        void *data;
1.130     manu     1413:        struct inpcb *inp;
                   1414:        size_t skip = 0;
                   1415:        size_t minlen;
                   1416:        size_t iphdrlen;
                   1417:        struct ip *ip;
                   1418:        struct mbuf *n;
1.136     manu     1419:        struct m_tag *tag;
                   1420:        struct udphdr *udphdr;
                   1421:        u_int16_t sport, dport;
1.144     manu     1422:        struct mbuf *m = *mp;
1.130     manu     1423:
1.131     perry    1424:        /*
1.130     manu     1425:         * Collapse the mbuf chain if the first mbuf is too short
                   1426:         * The longest case is: UDP + non ESP marker + ESP
                   1427:         */
                   1428:        minlen = off + sizeof(u_int64_t) + sizeof(struct esp);
                   1429:        if (minlen > m->m_pkthdr.len)
                   1430:                minlen = m->m_pkthdr.len;
                   1431:
                   1432:        if (m->m_len < minlen) {
1.144     manu     1433:                if ((*mp = m_pullup(m, minlen)) == NULL) {
1.130     manu     1434:                        printf("udp4_espinudp: m_pullup failed\n");
1.144     manu     1435:                        return -1;
1.130     manu     1436:                }
1.144     manu     1437:                m = *mp;
1.130     manu     1438:        }
                   1439:
1.131     perry    1440:        len = m->m_len - off;
1.158     christos 1441:        data = mtod(m, char *) + off;
1.130     manu     1442:        inp = sotoinpcb(so);
                   1443:
                   1444:        /* Ignore keepalive packets */
1.158     christos 1445:        if ((len == 1) && (*(unsigned char *)data == 0xff)) {
1.130     manu     1446:                return 1;
                   1447:        }
                   1448:
1.131     perry    1449:        /*
                   1450:         * Check that the payload is long enough to hold
1.130     manu     1451:         * an ESP header and compute the length of encapsulation
1.131     perry    1452:         * header to remove
1.130     manu     1453:         */
                   1454:        if (inp->inp_flags & INP_ESPINUDP) {
                   1455:                u_int32_t *st = (u_int32_t *)data;
                   1456:
                   1457:                if ((len <= sizeof(struct esp)) || (*st == 0))
                   1458:                        return 0; /* Normal UDP processing */
                   1459:
                   1460:                skip = sizeof(struct udphdr);
                   1461:        }
                   1462:
                   1463:        if (inp->inp_flags & INP_ESPINUDP_NON_IKE) {
1.142     kleink   1464:                u_int32_t *st = (u_int32_t *)data;
1.130     manu     1465:
                   1466:                if ((len <= sizeof(u_int64_t) + sizeof(struct esp))
1.142     kleink   1467:                    || ((st[0] | st[1]) != 0))
1.130     manu     1468:                        return 0; /* Normal UDP processing */
1.131     perry    1469:
1.130     manu     1470:                skip = sizeof(struct udphdr) + sizeof(u_int64_t);
                   1471:        }
                   1472:
                   1473:        /*
1.136     manu     1474:         * Get the UDP ports. They are handled in network
                   1475:         * order everywhere in IPSEC_NAT_T code.
                   1476:         */
1.158     christos 1477:        udphdr = (struct udphdr *)((char *)data - skip);
1.136     manu     1478:        sport = udphdr->uh_sport;
                   1479:        dport = udphdr->uh_dport;
                   1480:
                   1481:        /*
1.130     manu     1482:         * Remove the UDP header (and possibly the non ESP marker)
                   1483:         * IP header lendth is iphdrlen
1.131     perry    1484:         * Before:
1.130     manu     1485:         *   <--- off --->
                   1486:         *   +----+------+-----+
                   1487:         *   | IP |  UDP | ESP |
                   1488:         *   +----+------+-----+
                   1489:         *        <-skip->
                   1490:         * After:
                   1491:         *          +----+-----+
                   1492:         *          | IP | ESP |
                   1493:         *          +----+-----+
                   1494:         *   <-skip->
                   1495:         */
                   1496:        iphdrlen = off - sizeof(struct udphdr);
1.158     christos 1497:        memmove(mtod(m, char *) + skip, mtod(m, void *), iphdrlen);
1.130     manu     1498:        m_adj(m, skip);
                   1499:
                   1500:        ip = mtod(m, struct ip *);
                   1501:        ip->ip_len = htons(ntohs(ip->ip_len) - skip);
                   1502:        ip->ip_p = IPPROTO_ESP;
                   1503:
                   1504:        /*
1.131     perry    1505:         * Copy the mbuf to avoid multiple free, as both
                   1506:         * esp4_input (which we call) and udp_input (which
1.130     manu     1507:         * called us) free the mbuf.
                   1508:         */
                   1509:        if ((n = m_dup(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
                   1510:                printf("udp4_espinudp: m_dup failed\n");
                   1511:                return 0;
                   1512:        }
                   1513:
1.136     manu     1514:        /*
                   1515:         * Add a PACKET_TAG_IPSEC_NAT_T_PORT tag to remember
                   1516:         * the source UDP port. This is required if we want
                   1517:         * to select the right SPD for multiple hosts behind
                   1518:         * same NAT
                   1519:         */
1.137     manu     1520:        if ((tag = m_tag_get(PACKET_TAG_IPSEC_NAT_T_PORTS,
                   1521:            sizeof(sport) + sizeof(dport), M_DONTWAIT)) == NULL) {
                   1522:                printf("udp4_espinudp: m_tag_get failed\n");
1.138     manu     1523:                m_freem(n);
1.137     manu     1524:                return 0;
                   1525:        }
1.136     manu     1526:        ((u_int16_t *)(tag + 1))[0] = sport;
                   1527:        ((u_int16_t *)(tag + 1))[1] = dport;
                   1528:        m_tag_prepend(n, tag);
                   1529:
1.147     christos 1530: #ifdef FAST_IPSEC
1.160     degroote 1531:        ipsec4_common_input(n, iphdrlen, IPPROTO_ESP);
1.147     christos 1532: #else
1.130     manu     1533:        esp4_input(n, iphdrlen);
1.147     christos 1534: #endif
1.130     manu     1535:
                   1536:        /* We handled it, it shoudln't be handled by UDP */
                   1537:        return 1;
                   1538: }
                   1539: #endif

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