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Annotation of src/sys/netinet/udp_usrreq.c, Revision 1.152

1.152   ! yamt        1: /*     $NetBSD: udp_usrreq.c,v 1.151 2006/10/12 01:32:38 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>
1.152   ! yamt       64: __KERNEL_RCSID(0, "$NetBSD: udp_usrreq.c,v 1.151 2006/10/12 01:32:38 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: #ifndef        COMPAT_42
                    143: int    udpcksum = 1;
                    144: #else
                    145: int    udpcksum = 0;           /* XXX */
                    146: #endif
1.141     yamt      147: int    udp_do_loopback_cksum = 0;
1.93      matt      148:
                    149: struct inpcbtable udbtable;
                    150: struct udpstat udpstat;
1.8       mycroft   151:
1.72      itojun    152: #ifdef INET
1.130     manu      153: #ifdef IPSEC_NAT_T
1.144     manu      154: static int udp4_espinudp (struct mbuf **, int, struct sockaddr *,
1.130     manu      155:        struct socket *);
                    156: #endif
1.119     matt      157: static void udp4_sendup (struct mbuf *, int, struct sockaddr *,
                    158:        struct socket *);
                    159: static int udp4_realinput (struct sockaddr_in *, struct sockaddr_in *,
1.144     manu      160:        struct mbuf **, int);
1.129     yamt      161: static int udp4_input_checksum(struct mbuf *, const struct udphdr *, int, int);
1.72      itojun    162: #endif
1.53      itojun    163: #ifdef INET6
1.119     matt      164: static void udp6_sendup (struct mbuf *, int, struct sockaddr *,
                    165:        struct socket *);
                    166: static int udp6_realinput (int, struct sockaddr_in6 *,
                    167:        struct sockaddr_in6 *, struct mbuf *, int);
1.129     yamt      168: static int udp6_input_checksum(struct mbuf *, const struct udphdr *, int, int);
1.53      itojun    169: #endif
1.72      itojun    170: #ifdef INET
1.119     matt      171: static void udp_notify (struct inpcb *, int);
1.72      itojun    172: #endif
1.7       mycroft   173:
1.26      mycroft   174: #ifndef UDBHASHSIZE
                    175: #define        UDBHASHSIZE     128
                    176: #endif
                    177: int    udbhashsize = UDBHASHSIZE;
                    178:
1.98      matt      179: #ifdef MBUFTRACE
1.150     dogcow    180: struct mowner udp_mowner = MOWNER_INIT("udp", "");
                    181: struct mowner udp_rx_mowner = MOWNER_INIT("udp", "rx");
                    182: struct mowner udp_tx_mowner = MOWNER_INIT("udp", "tx");
1.98      matt      183: #endif
                    184:
1.78      thorpej   185: #ifdef UDP_CSUM_COUNTERS
                    186: #include <sys/device.h>
                    187:
1.140     yamt      188: #if defined(INET)
1.78      thorpej   189: struct evcnt udp_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    190:     NULL, "udp", "hwcsum bad");
                    191: struct evcnt udp_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    192:     NULL, "udp", "hwcsum ok");
                    193: struct evcnt udp_hwcsum_data = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    194:     NULL, "udp", "hwcsum data");
                    195: struct evcnt udp_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    196:     NULL, "udp", "swcsum");
                    197:
1.120     matt      198: EVCNT_ATTACH_STATIC(udp_hwcsum_bad);
                    199: EVCNT_ATTACH_STATIC(udp_hwcsum_ok);
                    200: EVCNT_ATTACH_STATIC(udp_hwcsum_data);
                    201: EVCNT_ATTACH_STATIC(udp_swcsum);
1.140     yamt      202: #endif /* defined(INET) */
                    203:
                    204: #if defined(INET6)
                    205: struct evcnt udp6_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    206:     NULL, "udp6", "hwcsum bad");
                    207: struct evcnt udp6_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    208:     NULL, "udp6", "hwcsum ok");
                    209: struct evcnt udp6_hwcsum_data = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    210:     NULL, "udp6", "hwcsum data");
                    211: struct evcnt udp6_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    212:     NULL, "udp6", "swcsum");
                    213:
                    214: EVCNT_ATTACH_STATIC(udp6_hwcsum_bad);
                    215: EVCNT_ATTACH_STATIC(udp6_hwcsum_ok);
                    216: EVCNT_ATTACH_STATIC(udp6_hwcsum_data);
                    217: EVCNT_ATTACH_STATIC(udp6_swcsum);
                    218: #endif /* defined(INET6) */
                    219:
                    220: #define        UDP_CSUM_COUNTER_INCR(ev)       (ev)->ev_count++
1.120     matt      221:
1.78      thorpej   222: #else
                    223:
                    224: #define        UDP_CSUM_COUNTER_INCR(ev)       /* nothing */
                    225:
                    226: #endif /* UDP_CSUM_COUNTERS */
                    227:
1.7       mycroft   228: void
1.119     matt      229: udp_init(void)
1.1       cgd       230: {
1.18      mycroft   231:
1.35      mycroft   232:        in_pcbinit(&udbtable, udbhashsize, udbhashsize);
1.78      thorpej   233:
1.98      matt      234:        MOWNER_ATTACH(&udp_tx_mowner);
                    235:        MOWNER_ATTACH(&udp_rx_mowner);
                    236:        MOWNER_ATTACH(&udp_mowner);
1.1       cgd       237: }
                    238:
1.129     yamt      239: /*
                    240:  * Checksum extended UDP header and data.
                    241:  */
                    242:
                    243: int
                    244: udp_input_checksum(int af, struct mbuf *m, const struct udphdr *uh,
                    245:     int iphlen, int len)
                    246: {
                    247:
                    248:        switch (af) {
1.72      itojun    249: #ifdef INET
1.129     yamt      250:        case AF_INET:
                    251:                return udp4_input_checksum(m, uh, iphlen, len);
                    252: #endif
                    253: #ifdef INET6
                    254:        case AF_INET6:
                    255:                return udp6_input_checksum(m, uh, iphlen, len);
                    256: #endif
                    257:        }
                    258: #ifdef DIAGNOSTIC
                    259:        panic("udp_input_checksum: unknown af %d", af);
                    260: #endif
                    261:        /* NOTREACHED */
                    262:        return -1;
                    263: }
                    264:
                    265: #ifdef INET
                    266:
                    267: /*
                    268:  * Checksum extended UDP header and data.
                    269:  */
                    270:
                    271: static int
                    272: udp4_input_checksum(struct mbuf *m, const struct udphdr *uh,
                    273:     int iphlen, int len)
                    274: {
                    275:
                    276:        /*
                    277:         * XXX it's better to record and check if this mbuf is
                    278:         * already checked.
                    279:         */
                    280:
                    281:        if (uh->uh_sum == 0)
                    282:                return 0;
                    283:
                    284:        switch (m->m_pkthdr.csum_flags &
                    285:            ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_UDPv4) |
                    286:            M_CSUM_TCP_UDP_BAD | M_CSUM_DATA)) {
                    287:        case M_CSUM_UDPv4|M_CSUM_TCP_UDP_BAD:
                    288:                UDP_CSUM_COUNTER_INCR(&udp_hwcsum_bad);
                    289:                goto badcsum;
                    290:
                    291:        case M_CSUM_UDPv4|M_CSUM_DATA: {
                    292:                u_int32_t hw_csum = m->m_pkthdr.csum_data;
                    293:
                    294:                UDP_CSUM_COUNTER_INCR(&udp_hwcsum_data);
                    295:                if (m->m_pkthdr.csum_flags & M_CSUM_NO_PSEUDOHDR) {
                    296:                        const struct ip *ip =
                    297:                            mtod(m, const struct ip *);
                    298:
                    299:                        hw_csum = in_cksum_phdr(ip->ip_src.s_addr,
                    300:                            ip->ip_dst.s_addr,
                    301:                            htons(hw_csum + len + IPPROTO_UDP));
                    302:                }
                    303:                if ((hw_csum ^ 0xffff) != 0)
                    304:                        goto badcsum;
                    305:                break;
                    306:        }
                    307:
                    308:        case M_CSUM_UDPv4:
                    309:                /* Checksum was okay. */
                    310:                UDP_CSUM_COUNTER_INCR(&udp_hwcsum_ok);
                    311:                break;
                    312:
                    313:        default:
                    314:                /*
                    315:                 * Need to compute it ourselves.  Maybe skip checksum
                    316:                 * on loopback interfaces.
                    317:                 */
                    318:                if (__predict_true(!(m->m_pkthdr.rcvif->if_flags &
                    319:                                     IFF_LOOPBACK) ||
                    320:                                   udp_do_loopback_cksum)) {
                    321:                        UDP_CSUM_COUNTER_INCR(&udp_swcsum);
                    322:                        if (in4_cksum(m, IPPROTO_UDP, iphlen, len) != 0)
                    323:                                goto badcsum;
                    324:                }
                    325:                break;
                    326:        }
                    327:
                    328:        return 0;
                    329:
                    330: badcsum:
                    331:        udpstat.udps_badsum++;
                    332:        return -1;
                    333: }
                    334:
1.7       mycroft   335: void
1.27      christos  336: udp_input(struct mbuf *m, ...)
1.1       cgd       337: {
1.53      itojun    338:        va_list ap;
                    339:        struct sockaddr_in src, dst;
                    340:        struct ip *ip;
                    341:        struct udphdr *uh;
1.97      simonb    342:        int iphlen;
1.53      itojun    343:        int len;
                    344:        int n;
1.96      itojun    345:        u_int16_t ip_len;
1.53      itojun    346:
                    347:        va_start(ap, m);
                    348:        iphlen = va_arg(ap, int);
1.97      simonb    349:        (void)va_arg(ap, int);          /* ignore value, advance ap */
1.53      itojun    350:        va_end(ap);
                    351:
1.98      matt      352:        MCLAIM(m, &udp_rx_mowner);
1.53      itojun    353:        udpstat.udps_ipackets++;
                    354:
                    355:        /*
                    356:         * Get IP and UDP header together in first mbuf.
                    357:         */
                    358:        ip = mtod(m, struct ip *);
                    359:        IP6_EXTHDR_GET(uh, struct udphdr *, m, iphlen, sizeof(struct udphdr));
                    360:        if (uh == NULL) {
                    361:                udpstat.udps_hdrops++;
                    362:                return;
                    363:        }
1.95      thorpej   364:        KASSERT(UDP_HDR_ALIGNED_P(uh));
1.53      itojun    365:
1.57      itojun    366:        /* destination port of 0 is illegal, based on RFC768. */
                    367:        if (uh->uh_dport == 0)
                    368:                goto bad;
                    369:
1.53      itojun    370:        /*
                    371:         * Make mbuf data length reflect UDP length.
                    372:         * If not enough data to reflect UDP length, drop.
                    373:         */
1.96      itojun    374:        ip_len = ntohs(ip->ip_len);
1.53      itojun    375:        len = ntohs((u_int16_t)uh->uh_ulen);
1.96      itojun    376:        if (ip_len != iphlen + len) {
                    377:                if (ip_len < iphlen + len || len < sizeof(struct udphdr)) {
1.53      itojun    378:                        udpstat.udps_badlen++;
                    379:                        goto bad;
                    380:                }
1.96      itojun    381:                m_adj(m, iphlen + len - ip_len);
1.53      itojun    382:        }
                    383:
                    384:        /*
                    385:         * Checksum extended UDP header and data.
                    386:         */
1.129     yamt      387:        if (udp4_input_checksum(m, uh, iphlen, len))
                    388:                goto badcsum;
1.53      itojun    389:
                    390:        /* construct source and dst sockaddrs. */
                    391:        bzero(&src, sizeof(src));
                    392:        src.sin_family = AF_INET;
                    393:        src.sin_len = sizeof(struct sockaddr_in);
                    394:        bcopy(&ip->ip_src, &src.sin_addr, sizeof(src.sin_addr));
                    395:        src.sin_port = uh->uh_sport;
                    396:        bzero(&dst, sizeof(dst));
                    397:        dst.sin_family = AF_INET;
                    398:        dst.sin_len = sizeof(struct sockaddr_in);
                    399:        bcopy(&ip->ip_dst, &dst.sin_addr, sizeof(dst.sin_addr));
                    400:        dst.sin_port = uh->uh_dport;
                    401:
1.144     manu      402:        if ((n = udp4_realinput(&src, &dst, &m, iphlen)) == -1) {
                    403:                udpstat.udps_hdrops++;
                    404:                return;
                    405:        }
1.53      itojun    406: #ifdef INET6
                    407:        if (IN_MULTICAST(ip->ip_dst.s_addr) || n == 0) {
                    408:                struct sockaddr_in6 src6, dst6;
                    409:
                    410:                bzero(&src6, sizeof(src6));
                    411:                src6.sin6_family = AF_INET6;
                    412:                src6.sin6_len = sizeof(struct sockaddr_in6);
                    413:                src6.sin6_addr.s6_addr[10] = src6.sin6_addr.s6_addr[11] = 0xff;
                    414:                bcopy(&ip->ip_src, &src6.sin6_addr.s6_addr[12],
                    415:                        sizeof(ip->ip_src));
                    416:                src6.sin6_port = uh->uh_sport;
                    417:                bzero(&dst6, sizeof(dst6));
                    418:                dst6.sin6_family = AF_INET6;
                    419:                dst6.sin6_len = sizeof(struct sockaddr_in6);
                    420:                dst6.sin6_addr.s6_addr[10] = dst6.sin6_addr.s6_addr[11] = 0xff;
                    421:                bcopy(&ip->ip_dst, &dst6.sin6_addr.s6_addr[12],
                    422:                        sizeof(ip->ip_dst));
                    423:                dst6.sin6_port = uh->uh_dport;
                    424:
                    425:                n += udp6_realinput(AF_INET, &src6, &dst6, m, iphlen);
                    426:        }
                    427: #endif
                    428:
                    429:        if (n == 0) {
                    430:                if (m->m_flags & (M_BCAST | M_MCAST)) {
                    431:                        udpstat.udps_noportbcast++;
                    432:                        goto bad;
                    433:                }
1.61      itojun    434:                udpstat.udps_noport++;
1.64      ws        435: #ifdef IPKDB
1.53      itojun    436:                if (checkipkdb(&ip->ip_src, uh->uh_sport, uh->uh_dport,
                    437:                                m, iphlen + sizeof(struct udphdr),
                    438:                                m->m_pkthdr.len - iphlen - sizeof(struct udphdr))) {
                    439:                        /*
                    440:                         * It was a debugger connect packet,
                    441:                         * just drop it now
                    442:                         */
                    443:                        goto bad;
                    444:                }
                    445: #endif
                    446:                icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0);
                    447:                m = NULL;
                    448:        }
                    449:
                    450: bad:
                    451:        if (m)
                    452:                m_freem(m);
1.78      thorpej   453:        return;
                    454:
                    455: badcsum:
                    456:        m_freem(m);
1.53      itojun    457: }
1.72      itojun    458: #endif
1.53      itojun    459:
                    460: #ifdef INET6
1.129     yamt      461: static int
                    462: udp6_input_checksum(struct mbuf *m, const struct udphdr *uh, int off, int len)
                    463: {
                    464:
1.140     yamt      465:        /*
                    466:         * XXX it's better to record and check if this mbuf is
                    467:         * already checked.
                    468:         */
                    469:
1.129     yamt      470:        if (__predict_false((m->m_flags & M_LOOP) && !udp_do_loopback_cksum)) {
                    471:                goto good;
                    472:        }
                    473:        if (uh->uh_sum == 0) {
                    474:                udp6stat.udp6s_nosum++;
                    475:                goto bad;
                    476:        }
1.140     yamt      477:
                    478:        switch (m->m_pkthdr.csum_flags &
                    479:            ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_UDPv6) |
                    480:            M_CSUM_TCP_UDP_BAD | M_CSUM_DATA)) {
                    481:        case M_CSUM_UDPv6|M_CSUM_TCP_UDP_BAD:
                    482:                UDP_CSUM_COUNTER_INCR(&udp6_hwcsum_bad);
1.129     yamt      483:                udp6stat.udp6s_badsum++;
                    484:                goto bad;
1.140     yamt      485:
                    486: #if 0 /* notyet */
                    487:        case M_CSUM_UDPv6|M_CSUM_DATA:
                    488: #endif
                    489:
                    490:        case M_CSUM_UDPv6:
                    491:                /* Checksum was okay. */
                    492:                UDP_CSUM_COUNTER_INCR(&udp6_hwcsum_ok);
                    493:                break;
                    494:
                    495:        default:
                    496:                /*
                    497:                 * Need to compute it ourselves.  Maybe skip checksum
                    498:                 * on loopback interfaces.
                    499:                 */
                    500:                UDP_CSUM_COUNTER_INCR(&udp6_swcsum);
                    501:                if (in6_cksum(m, IPPROTO_UDP, off, len) != 0) {
                    502:                        udp6stat.udp6s_badsum++;
                    503:                        goto bad;
                    504:                }
1.129     yamt      505:        }
                    506:
                    507: good:
                    508:        return 0;
                    509: bad:
                    510:        return -1;
                    511: }
                    512:
1.53      itojun    513: int
1.151     christos  514: udp6_input(struct mbuf **mp, int *offp, int proto __unused)
1.53      itojun    515: {
                    516:        struct mbuf *m = *mp;
                    517:        int off = *offp;
                    518:        struct sockaddr_in6 src, dst;
                    519:        struct ip6_hdr *ip6;
                    520:        struct udphdr *uh;
                    521:        u_int32_t plen, ulen;
                    522:
1.76      itojun    523:        ip6 = mtod(m, struct ip6_hdr *);
                    524:
1.53      itojun    525: #if defined(NFAITH) && 0 < NFAITH
1.76      itojun    526:        if (faithprefix(&ip6->ip6_dst)) {
                    527:                /* send icmp6 host unreach? */
                    528:                m_freem(m);
                    529:                return IPPROTO_DONE;
1.53      itojun    530:        }
                    531: #endif
                    532:
                    533:        udp6stat.udp6s_ipackets++;
                    534:
                    535:        /* check for jumbogram is done in ip6_input.  we can trust pkthdr.len */
                    536:        plen = m->m_pkthdr.len - off;
                    537:        IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(struct udphdr));
                    538:        if (uh == NULL) {
                    539:                ip6stat.ip6s_tooshort++;
                    540:                return IPPROTO_DONE;
                    541:        }
1.95      thorpej   542:        KASSERT(UDP_HDR_ALIGNED_P(uh));
1.53      itojun    543:        ulen = ntohs((u_short)uh->uh_ulen);
1.69      itojun    544:        /*
                    545:         * RFC2675 section 4: jumbograms will have 0 in the UDP header field,
                    546:         * iff payload length > 0xffff.
                    547:         */
1.53      itojun    548:        if (ulen == 0 && plen > 0xffff)
                    549:                ulen = plen;
                    550:
                    551:        if (plen != ulen) {
                    552:                udp6stat.udp6s_badlen++;
1.54      itojun    553:                goto bad;
                    554:        }
                    555:
1.57      itojun    556:        /* destination port of 0 is illegal, based on RFC768. */
                    557:        if (uh->uh_dport == 0)
                    558:                goto bad;
                    559:
1.54      itojun    560:        /* Be proactive about malicious use of IPv4 mapped address */
                    561:        if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
                    562:            IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
                    563:                /* XXX stat */
1.53      itojun    564:                goto bad;
                    565:        }
                    566:
                    567:        /*
1.125     thorpej   568:         * Checksum extended UDP header and data.  Maybe skip checksum
                    569:         * on loopback interfaces.
1.53      itojun    570:         */
1.129     yamt      571:        if (udp6_input_checksum(m, uh, off, ulen))
                    572:                goto bad;
1.53      itojun    573:
                    574:        /*
                    575:         * Construct source and dst sockaddrs.
                    576:         */
                    577:        bzero(&src, sizeof(src));
                    578:        src.sin6_family = AF_INET6;
                    579:        src.sin6_len = sizeof(struct sockaddr_in6);
1.146     rpaulo    580:        src.sin6_addr = ip6->ip6_src;
1.53      itojun    581:        src.sin6_port = uh->uh_sport;
                    582:        bzero(&dst, sizeof(dst));
                    583:        dst.sin6_family = AF_INET6;
                    584:        dst.sin6_len = sizeof(struct sockaddr_in6);
1.146     rpaulo    585:        dst.sin6_addr = ip6->ip6_dst;
1.53      itojun    586:        dst.sin6_port = uh->uh_dport;
                    587:
                    588:        if (udp6_realinput(AF_INET6, &src, &dst, m, off) == 0) {
                    589:                if (m->m_flags & M_MCAST) {
                    590:                        udp6stat.udp6s_noportmcast++;
                    591:                        goto bad;
                    592:                }
1.61      itojun    593:                udp6stat.udp6s_noport++;
1.53      itojun    594:                icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
                    595:                m = NULL;
                    596:        }
                    597:
                    598: bad:
                    599:        if (m)
                    600:                m_freem(m);
                    601:        return IPPROTO_DONE;
                    602: }
                    603: #endif
                    604:
1.72      itojun    605: #ifdef INET
1.53      itojun    606: static void
1.119     matt      607: udp4_sendup(struct mbuf *m, int off /* offset of data portion */,
                    608:        struct sockaddr *src, struct socket *so)
1.53      itojun    609: {
                    610:        struct mbuf *opts = NULL;
                    611:        struct mbuf *n;
                    612:        struct inpcb *inp = NULL;
                    613:
                    614:        if (!so)
                    615:                return;
                    616:        switch (so->so_proto->pr_domain->dom_family) {
                    617:        case AF_INET:
                    618:                inp = sotoinpcb(so);
                    619:                break;
                    620: #ifdef INET6
                    621:        case AF_INET6:
                    622:                break;
                    623: #endif
                    624:        default:
                    625:                return;
                    626:        }
                    627:
1.105     jonathan  628: #if defined(IPSEC) || defined(FAST_IPSEC)
1.53      itojun    629:        /* check AH/ESP integrity. */
                    630:        if (so != NULL && ipsec4_in_reject_so(m, so)) {
                    631:                ipsecstat.in_polvio++;
1.110     itojun    632:                if ((n = m_copy(m, 0, M_COPYALL)) != NULL)
                    633:                        icmp_error(n, ICMP_UNREACH, ICMP_UNREACH_ADMIN_PROHIBIT,
                    634:                            0, 0);
1.53      itojun    635:                return;
                    636:        }
                    637: #endif /*IPSEC*/
                    638:
                    639:        if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
                    640:                if (inp && (inp->inp_flags & INP_CONTROLOPTS
                    641:                         || so->so_options & SO_TIMESTAMP)) {
                    642:                        struct ip *ip = mtod(n, struct ip *);
                    643:                        ip_savecontrol(inp, &opts, ip, n);
                    644:                }
                    645:
                    646:                m_adj(n, off);
                    647:                if (sbappendaddr(&so->so_rcv, src, n,
                    648:                                opts) == 0) {
                    649:                        m_freem(n);
                    650:                        if (opts)
                    651:                                m_freem(opts);
1.124     darrenr   652:                        so->so_rcv.sb_overflowed++;
1.81      enami     653:                        udpstat.udps_fullsock++;
1.53      itojun    654:                } else
                    655:                        sorwakeup(so);
                    656:        }
                    657: }
1.72      itojun    658: #endif
1.53      itojun    659:
                    660: #ifdef INET6
                    661: static void
1.119     matt      662: udp6_sendup(struct mbuf *m, int off /* offset of data portion */,
                    663:        struct sockaddr *src, struct socket *so)
1.53      itojun    664: {
                    665:        struct mbuf *opts = NULL;
                    666:        struct mbuf *n;
                    667:        struct in6pcb *in6p = NULL;
                    668:
                    669:        if (!so)
                    670:                return;
                    671:        if (so->so_proto->pr_domain->dom_family != AF_INET6)
                    672:                return;
                    673:        in6p = sotoin6pcb(so);
                    674:
1.105     jonathan  675: #if defined(IPSEC) || defined(FAST_IPSEC)
1.53      itojun    676:        /* check AH/ESP integrity. */
                    677:        if (so != NULL && ipsec6_in_reject_so(m, so)) {
                    678:                ipsec6stat.in_polvio++;
1.111     mycroft   679:                if ((n = m_copy(m, 0, M_COPYALL)) != NULL)
1.110     itojun    680:                        icmp6_error(n, ICMP6_DST_UNREACH,
                    681:                            ICMP6_DST_UNREACH_ADMIN, 0);
1.53      itojun    682:                return;
                    683:        }
                    684: #endif /*IPSEC*/
                    685:
                    686:        if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
                    687:                if (in6p && (in6p->in6p_flags & IN6P_CONTROLOPTS
                    688:                          || in6p->in6p_socket->so_options & SO_TIMESTAMP)) {
                    689:                        struct ip6_hdr *ip6 = mtod(n, struct ip6_hdr *);
                    690:                        ip6_savecontrol(in6p, &opts, ip6, n);
                    691:                }
                    692:
                    693:                m_adj(n, off);
                    694:                if (sbappendaddr(&so->so_rcv, src, n, opts) == 0) {
                    695:                        m_freem(n);
                    696:                        if (opts)
                    697:                                m_freem(opts);
1.124     darrenr   698:                        so->so_rcv.sb_overflowed++;
1.53      itojun    699:                        udp6stat.udp6s_fullsock++;
                    700:                } else
                    701:                        sorwakeup(so);
                    702:        }
                    703: }
                    704: #endif
                    705:
1.72      itojun    706: #ifdef INET
1.53      itojun    707: static int
1.119     matt      708: udp4_realinput(struct sockaddr_in *src, struct sockaddr_in *dst,
1.144     manu      709:        struct mbuf **mp, int off /* offset of udphdr */)
1.53      itojun    710: {
                    711:        u_int16_t *sport, *dport;
                    712:        int rcvcnt;
                    713:        struct in_addr *src4, *dst4;
1.109     itojun    714:        struct inpcb_hdr *inph;
1.53      itojun    715:        struct inpcb *inp;
1.144     manu      716:        struct mbuf *m = *mp;
1.53      itojun    717:
                    718:        rcvcnt = 0;
                    719:        off += sizeof(struct udphdr);   /* now, offset of payload */
                    720:
                    721:        if (src->sin_family != AF_INET || dst->sin_family != AF_INET)
                    722:                goto bad;
                    723:
                    724:        src4 = &src->sin_addr;
                    725:        sport = &src->sin_port;
                    726:        dst4 = &dst->sin_addr;
                    727:        dport = &dst->sin_port;
                    728:
1.73      itojun    729:        if (IN_MULTICAST(dst4->s_addr) ||
1.53      itojun    730:            in_broadcast(*dst4, m->m_pkthdr.rcvif)) {
                    731:                /*
                    732:                 * Deliver a multicast or broadcast datagram to *all* sockets
                    733:                 * for which the local and remote addresses and ports match
                    734:                 * those of the incoming datagram.  This allows more than
                    735:                 * one process to receive multi/broadcasts on the same port.
                    736:                 * (This really ought to be done for unicast datagrams as
                    737:                 * well, but that would cause problems with existing
                    738:                 * applications that open both address-specific sockets and
                    739:                 * a wildcard socket listening to the same port -- they would
                    740:                 * end up receiving duplicates of every unicast datagram.
                    741:                 * Those applications open the multiple sockets to overcome an
                    742:                 * inadequacy of the UDP socket interface, but for backwards
                    743:                 * compatibility we avoid the problem here rather than
                    744:                 * fixing the interface.  Maybe 4.5BSD will remedy this?)
                    745:                 */
                    746:
                    747:                /*
1.92      itojun    748:                 * KAME note: traditionally we dropped udpiphdr from mbuf here.
1.71      itojun    749:                 * we need udpiphdr for IPsec processing so we do that later.
1.53      itojun    750:                 */
                    751:                /*
                    752:                 * Locate pcb(s) for datagram.
                    753:                 */
1.109     itojun    754:                CIRCLEQ_FOREACH(inph, &udbtable.inpt_queue, inph_queue) {
                    755:                        inp = (struct inpcb *)inph;
                    756:                        if (inp->inp_af != AF_INET)
                    757:                                continue;
                    758:
1.53      itojun    759:                        if (inp->inp_lport != *dport)
                    760:                                continue;
                    761:                        if (!in_nullhost(inp->inp_laddr)) {
                    762:                                if (!in_hosteq(inp->inp_laddr, *dst4))
                    763:                                        continue;
                    764:                        }
                    765:                        if (!in_nullhost(inp->inp_faddr)) {
                    766:                                if (!in_hosteq(inp->inp_faddr, *src4) ||
                    767:                                    inp->inp_fport != *sport)
                    768:                                        continue;
                    769:                        }
                    770:
                    771:                        udp4_sendup(m, off, (struct sockaddr *)src,
                    772:                                inp->inp_socket);
                    773:                        rcvcnt++;
                    774:
                    775:                        /*
                    776:                         * Don't look for additional matches if this one does
                    777:                         * not have either the SO_REUSEPORT or SO_REUSEADDR
                    778:                         * socket options set.  This heuristic avoids searching
                    779:                         * through all pcbs in the common case of a non-shared
                    780:                         * port.  It assumes that an application will never
                    781:                         * clear these options after setting them.
                    782:                         */
                    783:                        if ((inp->inp_socket->so_options &
                    784:                            (SO_REUSEPORT|SO_REUSEADDR)) == 0)
                    785:                                break;
                    786:                }
                    787:        } else {
                    788:                /*
                    789:                 * Locate pcb for datagram.
                    790:                 */
                    791:                inp = in_pcblookup_connect(&udbtable, *src4, *sport, *dst4, *dport);
                    792:                if (inp == 0) {
                    793:                        ++udpstat.udps_pcbhashmiss;
                    794:                        inp = in_pcblookup_bind(&udbtable, *dst4, *dport);
1.82      itojun    795:                        if (inp == 0)
1.53      itojun    796:                                return rcvcnt;
                    797:                }
                    798:
1.130     manu      799: #ifdef IPSEC_NAT_T
                    800:                /* Handle ESP over UDP */
                    801:                if (inp->inp_flags & INP_ESPINUDP_ALL) {
                    802:                        struct sockaddr *sa = (struct sockaddr *)src;
                    803:
1.144     manu      804:                        switch(udp4_espinudp(mp, off, sa, inp->inp_socket)) {
                    805:                        case -1:        /* Error, m was freeed */
                    806:                                rcvcnt = -1;
                    807:                                goto bad;
                    808:                                break;
                    809:
                    810:                        case 1:         /* ESP over UDP */
1.130     manu      811:                                rcvcnt++;
                    812:                                goto bad;
1.144     manu      813:                                break;
                    814:
                    815:                        case 0:         /* plain UDP */
                    816:                        default:        /* Unexpected */
                    817:                                /*
                    818:                                 * Normal UDP processing will take place
                    819:                                 * m may have changed.
                    820:                                 */
                    821:                                m = *mp;
                    822:                                break;
1.130     manu      823:                        }
                    824:                }
                    825: #endif
                    826:
1.53      itojun    827:                udp4_sendup(m, off, (struct sockaddr *)src, inp->inp_socket);
                    828:                rcvcnt++;
                    829:        }
                    830:
                    831: bad:
                    832:        return rcvcnt;
                    833: }
1.72      itojun    834: #endif
1.53      itojun    835:
                    836: #ifdef INET6
                    837: static int
1.119     matt      838: udp6_realinput(int af, struct sockaddr_in6 *src, struct sockaddr_in6 *dst,
                    839:        struct mbuf *m, int off)
1.53      itojun    840: {
1.79      itojun    841:        u_int16_t sport, dport;
1.53      itojun    842:        int rcvcnt;
1.146     rpaulo    843:        struct in6_addr src6, *dst6;
1.79      itojun    844:        const struct in_addr *dst4;
1.109     itojun    845:        struct inpcb_hdr *inph;
1.53      itojun    846:        struct in6pcb *in6p;
                    847:
                    848:        rcvcnt = 0;
                    849:        off += sizeof(struct udphdr);   /* now, offset of payload */
                    850:
                    851:        if (af != AF_INET && af != AF_INET6)
                    852:                goto bad;
                    853:        if (src->sin6_family != AF_INET6 || dst->sin6_family != AF_INET6)
                    854:                goto bad;
                    855:
1.146     rpaulo    856:        src6 = src->sin6_addr;
                    857:        if (sa6_recoverscope(src) != 0) {
                    858:                /* XXX: should be impossible. */
                    859:                goto bad;
                    860:        }
1.79      itojun    861:        sport = src->sin6_port;
1.146     rpaulo    862:
1.79      itojun    863:        dport = dst->sin6_port;
1.88      itojun    864:        dst4 = (struct in_addr *)&dst->sin6_addr.s6_addr[12];
1.146     rpaulo    865:        dst6 = &dst->sin6_addr;
1.53      itojun    866:
1.146     rpaulo    867:        if (IN6_IS_ADDR_MULTICAST(dst6) ||
1.79      itojun    868:            (af == AF_INET && IN_MULTICAST(dst4->s_addr))) {
1.53      itojun    869:                /*
                    870:                 * Deliver a multicast or broadcast datagram to *all* sockets
                    871:                 * for which the local and remote addresses and ports match
                    872:                 * those of the incoming datagram.  This allows more than
                    873:                 * one process to receive multi/broadcasts on the same port.
                    874:                 * (This really ought to be done for unicast datagrams as
                    875:                 * well, but that would cause problems with existing
                    876:                 * applications that open both address-specific sockets and
                    877:                 * a wildcard socket listening to the same port -- they would
                    878:                 * end up receiving duplicates of every unicast datagram.
                    879:                 * Those applications open the multiple sockets to overcome an
                    880:                 * inadequacy of the UDP socket interface, but for backwards
                    881:                 * compatibility we avoid the problem here rather than
                    882:                 * fixing the interface.  Maybe 4.5BSD will remedy this?)
                    883:                 */
                    884:
                    885:                /*
1.92      itojun    886:                 * KAME note: traditionally we dropped udpiphdr from mbuf here.
1.71      itojun    887:                 * we need udpiphdr for IPsec processing so we do that later.
1.53      itojun    888:                 */
                    889:                /*
                    890:                 * Locate pcb(s) for datagram.
                    891:                 */
1.109     itojun    892:                CIRCLEQ_FOREACH(inph, &udbtable.inpt_queue, inph_queue) {
                    893:                        in6p = (struct in6pcb *)inph;
                    894:                        if (in6p->in6p_af != AF_INET6)
                    895:                                continue;
                    896:
1.79      itojun    897:                        if (in6p->in6p_lport != dport)
1.53      itojun    898:                                continue;
                    899:                        if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) {
1.146     rpaulo    900:                                if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr,
                    901:                                    dst6))
1.53      itojun    902:                                        continue;
1.92      itojun    903:                        } else {
1.146     rpaulo    904:                                if (IN6_IS_ADDR_V4MAPPED(dst6) &&
1.85      itojun    905:                                    (in6p->in6p_flags & IN6P_IPV6_V6ONLY))
1.55      itojun    906:                                        continue;
                    907:                        }
1.53      itojun    908:                        if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
1.79      itojun    909:                                if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr,
                    910:                                    &src6) || in6p->in6p_fport != sport)
1.53      itojun    911:                                        continue;
1.92      itojun    912:                        } else {
1.79      itojun    913:                                if (IN6_IS_ADDR_V4MAPPED(&src6) &&
1.85      itojun    914:                                    (in6p->in6p_flags & IN6P_IPV6_V6ONLY))
1.55      itojun    915:                                        continue;
                    916:                        }
1.53      itojun    917:
                    918:                        udp6_sendup(m, off, (struct sockaddr *)src,
                    919:                                in6p->in6p_socket);
                    920:                        rcvcnt++;
                    921:
                    922:                        /*
                    923:                         * Don't look for additional matches if this one does
                    924:                         * not have either the SO_REUSEPORT or SO_REUSEADDR
                    925:                         * socket options set.  This heuristic avoids searching
                    926:                         * through all pcbs in the common case of a non-shared
                    927:                         * port.  It assumes that an application will never
                    928:                         * clear these options after setting them.
                    929:                         */
                    930:                        if ((in6p->in6p_socket->so_options &
                    931:                            (SO_REUSEPORT|SO_REUSEADDR)) == 0)
                    932:                                break;
                    933:                }
                    934:        } else {
                    935:                /*
                    936:                 * Locate pcb for datagram.
                    937:                 */
1.146     rpaulo    938:                in6p = in6_pcblookup_connect(&udbtable, &src6, sport, dst6,
                    939:                    dport, 0);
1.53      itojun    940:                if (in6p == 0) {
                    941:                        ++udpstat.udps_pcbhashmiss;
1.146     rpaulo    942:                        in6p = in6_pcblookup_bind(&udbtable, dst6, dport, 0);
1.82      itojun    943:                        if (in6p == 0)
1.53      itojun    944:                                return rcvcnt;
                    945:                }
                    946:
                    947:                udp6_sendup(m, off, (struct sockaddr *)src, in6p->in6p_socket);
                    948:                rcvcnt++;
                    949:        }
                    950:
                    951: bad:
                    952:        return rcvcnt;
                    953: }
                    954: #endif
1.1       cgd       955:
1.72      itojun    956: #ifdef INET
1.1       cgd       957: /*
                    958:  * Notify a udp user of an asynchronous error;
                    959:  * just wake up so that he can collect error status.
                    960:  */
1.7       mycroft   961: static void
1.119     matt      962: udp_notify(struct inpcb *inp, int errno)
1.1       cgd       963: {
                    964:        inp->inp_socket->so_error = errno;
                    965:        sorwakeup(inp->inp_socket);
                    966:        sowwakeup(inp->inp_socket);
                    967: }
                    968:
1.27      christos  969: void *
1.119     matt      970: udp_ctlinput(int cmd, struct sockaddr *sa, void *v)
1.1       cgd       971: {
1.66      augustss  972:        struct ip *ip = v;
                    973:        struct udphdr *uh;
1.119     matt      974:        void (*notify)(struct inpcb *, int) = udp_notify;
1.21      mycroft   975:        int errno;
1.1       cgd       976:
1.53      itojun    977:        if (sa->sa_family != AF_INET
                    978:         || sa->sa_len != sizeof(struct sockaddr_in))
1.51      itojun    979:                return NULL;
1.20      mycroft   980:        if ((unsigned)cmd >= PRC_NCMDS)
1.27      christos  981:                return NULL;
1.20      mycroft   982:        errno = inetctlerrmap[cmd];
1.18      mycroft   983:        if (PRC_IS_REDIRECT(cmd))
1.19      mycroft   984:                notify = in_rtchange, ip = 0;
1.18      mycroft   985:        else if (cmd == PRC_HOSTDEAD)
1.19      mycroft   986:                ip = 0;
1.23      cgd       987:        else if (errno == 0)
1.27      christos  988:                return NULL;
1.19      mycroft   989:        if (ip) {
1.1       cgd       990:                uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2));
1.34      mycroft   991:                in_pcbnotify(&udbtable, satosin(sa)->sin_addr, uh->uh_dport,
                    992:                    ip->ip_src, uh->uh_sport, errno, notify);
1.53      itojun    993:
                    994:                /* XXX mapped address case */
1.19      mycroft   995:        } else
1.34      mycroft   996:                in_pcbnotifyall(&udbtable, satosin(sa)->sin_addr, errno,
                    997:                    notify);
1.27      christos  998:        return NULL;
1.1       cgd       999: }
                   1000:
1.7       mycroft  1001: int
1.152   ! yamt     1002: udp_ctloutput(int op, struct socket *so, int level, int optname,
        !          1003:     struct mbuf **mp)
1.130     manu     1004: {
                   1005:        int s;
                   1006:        int error = 0;
                   1007:        struct mbuf *m;
                   1008:        struct inpcb *inp;
                   1009:        int family;
                   1010:
                   1011:        family = so->so_proto->pr_domain->dom_family;
                   1012:
                   1013:        s = splsoftnet();
                   1014:        switch (family) {
                   1015: #ifdef INET
                   1016:        case PF_INET:
                   1017:                if (level != IPPROTO_UDP) {
                   1018:                        error = ip_ctloutput(op, so, level, optname, mp);
                   1019:                        goto end;
                   1020:                }
                   1021:                break;
                   1022: #endif
                   1023: #ifdef INET6
                   1024:        case PF_INET6:
                   1025:                if (level != IPPROTO_UDP) {
                   1026:                        error = ip6_ctloutput(op, so, level, optname, mp);
                   1027:                        goto end;
                   1028:                }
                   1029:                break;
                   1030: #endif
                   1031:        default:
                   1032:                error = EAFNOSUPPORT;
                   1033:                goto end;
                   1034:                break;
                   1035:        }
                   1036:
                   1037:
                   1038:        switch (op) {
                   1039:        case PRCO_SETOPT:
                   1040:                m = *mp;
                   1041:                inp = sotoinpcb(so);
                   1042:
                   1043:                switch (optname) {
                   1044:                case UDP_ENCAP:
                   1045:                        if (m == NULL || m->m_len < sizeof (int)) {
                   1046:                                error = EINVAL;
                   1047:                                goto end;
                   1048:                        }
1.131     perry    1049:
1.130     manu     1050:                        switch(*mtod(m, int *)) {
                   1051: #ifdef IPSEC_NAT_T
                   1052:                        case 0:
                   1053:                                inp->inp_flags &= ~INP_ESPINUDP_ALL;
                   1054:                                break;
                   1055:
                   1056:                        case UDP_ENCAP_ESPINUDP:
                   1057:                                inp->inp_flags &= ~INP_ESPINUDP_ALL;
                   1058:                                inp->inp_flags |= INP_ESPINUDP;
                   1059:                                break;
1.131     perry    1060:
1.130     manu     1061:                        case UDP_ENCAP_ESPINUDP_NON_IKE:
                   1062:                                inp->inp_flags &= ~INP_ESPINUDP_ALL;
                   1063:                                inp->inp_flags |= INP_ESPINUDP_NON_IKE;
                   1064:                                break;
                   1065: #endif
                   1066:                        default:
                   1067:                                error = EINVAL;
                   1068:                                goto end;
                   1069:                                break;
                   1070:                        }
                   1071:                        break;
                   1072:
                   1073:                default:
                   1074:                        error = ENOPROTOOPT;
                   1075:                        goto end;
                   1076:                        break;
                   1077:                }
                   1078:                break;
                   1079:
                   1080:        default:
                   1081:                error = EINVAL;
                   1082:                goto end;
                   1083:                break;
1.131     perry    1084:        }
                   1085:
1.130     manu     1086: end:
                   1087:        splx(s);
                   1088:        return error;
                   1089: }
1.131     perry    1090:
1.130     manu     1091:
                   1092: int
1.27      christos 1093: udp_output(struct mbuf *m, ...)
                   1094: {
1.66      augustss 1095:        struct inpcb *inp;
                   1096:        struct udpiphdr *ui;
1.125     thorpej  1097:        struct route *ro;
1.66      augustss 1098:        int len = m->m_pkthdr.len;
1.31      mycroft  1099:        int error = 0;
1.27      christos 1100:        va_list ap;
                   1101:
1.98      matt     1102:        MCLAIM(m, &udp_tx_mowner);
1.27      christos 1103:        va_start(ap, m);
                   1104:        inp = va_arg(ap, struct inpcb *);
                   1105:        va_end(ap);
1.1       cgd      1106:
                   1107:        /*
                   1108:         * Calculate data length and get a mbuf
                   1109:         * for UDP and IP headers.
                   1110:         */
1.13      mycroft  1111:        M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT);
                   1112:        if (m == 0) {
                   1113:                error = ENOBUFS;
1.39      thorpej  1114:                goto release;
                   1115:        }
                   1116:
                   1117:        /*
                   1118:         * Compute the packet length of the IP header, and
                   1119:         * punt if the length looks bogus.
                   1120:         */
1.96      itojun   1121:        if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) {
1.39      thorpej  1122:                error = EMSGSIZE;
1.13      mycroft  1123:                goto release;
                   1124:        }
1.1       cgd      1125:
                   1126:        /*
                   1127:         * Fill in mbuf with extended UDP header
                   1128:         * and addresses and length put into network format.
                   1129:         */
                   1130:        ui = mtod(m, struct udpiphdr *);
                   1131:        ui->ui_pr = IPPROTO_UDP;
                   1132:        ui->ui_src = inp->inp_laddr;
                   1133:        ui->ui_dst = inp->inp_faddr;
                   1134:        ui->ui_sport = inp->inp_lport;
                   1135:        ui->ui_dport = inp->inp_fport;
1.78      thorpej  1136:        ui->ui_ulen = htons((u_int16_t)len + sizeof(struct udphdr));
1.1       cgd      1137:
1.125     thorpej  1138:        ro = &inp->inp_route;
                   1139:
1.1       cgd      1140:        /*
1.78      thorpej  1141:         * Set up checksum and output datagram.
1.1       cgd      1142:         */
                   1143:        if (udpcksum) {
1.78      thorpej  1144:                /*
                   1145:                 * XXX Cache pseudo-header checksum part for
                   1146:                 * XXX "connected" UDP sockets.
                   1147:                 */
                   1148:                ui->ui_sum = in_cksum_phdr(ui->ui_src.s_addr,
                   1149:                    ui->ui_dst.s_addr, htons((u_int16_t)len +
                   1150:                    sizeof(struct udphdr) + IPPROTO_UDP));
1.135     yamt     1151:                m->m_pkthdr.csum_flags = M_CSUM_UDPv4;
1.78      thorpej  1152:                m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
                   1153:        } else
                   1154:                ui->ui_sum = 0;
1.96      itojun   1155:        ((struct ip *)ui)->ip_len = htons(sizeof (struct udpiphdr) + len);
1.1       cgd      1156:        ((struct ip *)ui)->ip_ttl = inp->inp_ip.ip_ttl; /* XXX */
                   1157:        ((struct ip *)ui)->ip_tos = inp->inp_ip.ip_tos; /* XXX */
                   1158:        udpstat.udps_opackets++;
1.48      itojun   1159:
1.125     thorpej  1160:        return (ip_output(m, inp->inp_options, ro,
1.12      mycroft  1161:            inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST),
1.107     itojun   1162:            inp->inp_moptions, inp->inp_socket));
1.1       cgd      1163:
                   1164: release:
                   1165:        m_freem(m);
                   1166:        return (error);
                   1167: }
                   1168:
1.42      thorpej  1169: int    udp_sendspace = 9216;           /* really max datagram size */
                   1170: int    udp_recvspace = 40 * (1024 + sizeof(struct sockaddr_in));
1.1       cgd      1171:                                        /* 40 1K datagrams */
                   1172:
                   1173: /*ARGSUSED*/
1.7       mycroft  1174: int
1.119     matt     1175: udp_usrreq(struct socket *so, int req, struct mbuf *m, struct mbuf *nam,
1.145     christos 1176:        struct mbuf *control, struct lwp *l)
1.1       cgd      1177: {
1.66      augustss 1178:        struct inpcb *inp;
1.1       cgd      1179:        int s;
1.66      augustss 1180:        int error = 0;
1.1       cgd      1181:
                   1182:        if (req == PRU_CONTROL)
1.31      mycroft  1183:                return (in_control(so, (long)m, (caddr_t)nam,
1.148     ad       1184:                    (struct ifnet *)control, l));
1.59      thorpej  1185:
1.149     tls      1186:        s = splsoftnet();
                   1187:
1.60      thorpej  1188:        if (req == PRU_PURGEIF) {
1.80      itojun   1189:                in_pcbpurgeif0(&udbtable, (struct ifnet *)control);
1.60      thorpej  1190:                in_purgeif((struct ifnet *)control);
                   1191:                in_pcbpurgeif(&udbtable, (struct ifnet *)control);
1.149     tls      1192:                splx(s);
1.59      thorpej  1193:                return (0);
                   1194:        }
1.31      mycroft  1195:
                   1196:        inp = sotoinpcb(so);
1.32      mycroft  1197: #ifdef DIAGNOSTIC
                   1198:        if (req != PRU_SEND && req != PRU_SENDOOB && control)
                   1199:                panic("udp_usrreq: unexpected control mbuf");
                   1200: #endif
1.31      mycroft  1201:        if (inp == 0 && req != PRU_ATTACH) {
                   1202:                error = EINVAL;
                   1203:                goto release;
                   1204:        }
                   1205:
1.1       cgd      1206:        /*
                   1207:         * Note: need to block udp_input while changing
                   1208:         * the udp pcb queue and/or pcb addresses.
                   1209:         */
                   1210:        switch (req) {
                   1211:
                   1212:        case PRU_ATTACH:
1.31      mycroft  1213:                if (inp != 0) {
                   1214:                        error = EISCONN;
1.1       cgd      1215:                        break;
                   1216:                }
1.98      matt     1217: #ifdef MBUFTRACE
                   1218:                so->so_mowner = &udp_mowner;
                   1219:                so->so_rcv.sb_mowner = &udp_rx_mowner;
                   1220:                so->so_snd.sb_mowner = &udp_tx_mowner;
                   1221: #endif
1.31      mycroft  1222:                if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
                   1223:                        error = soreserve(so, udp_sendspace, udp_recvspace);
                   1224:                        if (error)
                   1225:                                break;
                   1226:                }
1.18      mycroft  1227:                error = in_pcballoc(so, &udbtable);
1.1       cgd      1228:                if (error)
                   1229:                        break;
1.31      mycroft  1230:                inp = sotoinpcb(so);
                   1231:                inp->inp_ip.ip_ttl = ip_defttl;
1.1       cgd      1232:                break;
                   1233:
                   1234:        case PRU_DETACH:
1.31      mycroft  1235:                in_pcbdetach(inp);
1.1       cgd      1236:                break;
                   1237:
                   1238:        case PRU_BIND:
1.148     ad       1239:                error = in_pcbbind(inp, nam, l);
1.1       cgd      1240:                break;
                   1241:
                   1242:        case PRU_LISTEN:
                   1243:                error = EOPNOTSUPP;
                   1244:                break;
                   1245:
                   1246:        case PRU_CONNECT:
1.148     ad       1247:                error = in_pcbconnect(inp, nam, l);
1.31      mycroft  1248:                if (error)
1.1       cgd      1249:                        break;
1.31      mycroft  1250:                soisconnected(so);
1.1       cgd      1251:                break;
                   1252:
                   1253:        case PRU_CONNECT2:
                   1254:                error = EOPNOTSUPP;
                   1255:                break;
                   1256:
                   1257:        case PRU_DISCONNECT:
1.31      mycroft  1258:                /*soisdisconnected(so);*/
                   1259:                so->so_state &= ~SS_ISCONNECTED;        /* XXX */
1.1       cgd      1260:                in_pcbdisconnect(inp);
1.34      mycroft  1261:                inp->inp_laddr = zeroin_addr;           /* XXX */
1.35      mycroft  1262:                in_pcbstate(inp, INP_BOUND);            /* XXX */
1.1       cgd      1263:                break;
                   1264:
                   1265:        case PRU_SHUTDOWN:
                   1266:                socantsendmore(so);
                   1267:                break;
                   1268:
1.31      mycroft  1269:        case PRU_RCVD:
                   1270:                error = EOPNOTSUPP;
1.1       cgd      1271:                break;
                   1272:
1.31      mycroft  1273:        case PRU_SEND:
1.32      mycroft  1274:                if (control && control->m_len) {
                   1275:                        m_freem(control);
                   1276:                        m_freem(m);
                   1277:                        error = EINVAL;
                   1278:                        break;
                   1279:                }
1.31      mycroft  1280:        {
1.35      mycroft  1281:                struct in_addr laddr;                   /* XXX */
1.1       cgd      1282:
1.31      mycroft  1283:                if (nam) {
1.35      mycroft  1284:                        laddr = inp->inp_laddr;         /* XXX */
1.31      mycroft  1285:                        if ((so->so_state & SS_ISCONNECTED) != 0) {
                   1286:                                error = EISCONN;
1.32      mycroft  1287:                                goto die;
1.31      mycroft  1288:                        }
1.148     ad       1289:                        error = in_pcbconnect(inp, nam, l);
1.100     matt     1290:                        if (error)
                   1291:                                goto die;
1.31      mycroft  1292:                } else {
                   1293:                        if ((so->so_state & SS_ISCONNECTED) == 0) {
                   1294:                                error = ENOTCONN;
1.32      mycroft  1295:                                goto die;
1.31      mycroft  1296:                        }
                   1297:                }
1.33      mycroft  1298:                error = udp_output(m, inp);
1.100     matt     1299:                m = NULL;
1.31      mycroft  1300:                if (nam) {
                   1301:                        in_pcbdisconnect(inp);
1.35      mycroft  1302:                        inp->inp_laddr = laddr;         /* XXX */
                   1303:                        in_pcbstate(inp, INP_BOUND);    /* XXX */
1.31      mycroft  1304:                }
1.100     matt     1305:          die:
                   1306:                if (m)
                   1307:                        m_freem(m);
1.31      mycroft  1308:        }
1.1       cgd      1309:                break;
                   1310:
                   1311:        case PRU_SENSE:
                   1312:                /*
                   1313:                 * stat: don't bother with a blocksize.
                   1314:                 */
1.31      mycroft  1315:                splx(s);
1.1       cgd      1316:                return (0);
                   1317:
1.31      mycroft  1318:        case PRU_RCVOOB:
                   1319:                error =  EOPNOTSUPP;
                   1320:                break;
                   1321:
1.1       cgd      1322:        case PRU_SENDOOB:
1.32      mycroft  1323:                m_freem(control);
1.31      mycroft  1324:                m_freem(m);
1.1       cgd      1325:                error =  EOPNOTSUPP;
                   1326:                break;
                   1327:
1.31      mycroft  1328:        case PRU_SOCKADDR:
                   1329:                in_setsockaddr(inp, nam);
                   1330:                break;
                   1331:
                   1332:        case PRU_PEERADDR:
                   1333:                in_setpeeraddr(inp, nam);
                   1334:                break;
1.1       cgd      1335:
                   1336:        default:
                   1337:                panic("udp_usrreq");
                   1338:        }
                   1339:
                   1340: release:
1.31      mycroft  1341:        splx(s);
1.1       cgd      1342:        return (error);
1.13      mycroft  1343: }
                   1344:
                   1345: /*
                   1346:  * Sysctl for udp variables.
                   1347:  */
1.114     atatat   1348: SYSCTL_SETUP(sysctl_net_inet_udp_setup, "sysctl net.inet.udp subtree setup")
1.13      mycroft  1349: {
1.114     atatat   1350:
1.116     atatat   1351:        sysctl_createv(clog, 0, NULL, NULL,
                   1352:                       CTLFLAG_PERMANENT,
1.114     atatat   1353:                       CTLTYPE_NODE, "net", NULL,
                   1354:                       NULL, 0, NULL, 0,
                   1355:                       CTL_NET, CTL_EOL);
1.116     atatat   1356:        sysctl_createv(clog, 0, NULL, NULL,
                   1357:                       CTLFLAG_PERMANENT,
1.114     atatat   1358:                       CTLTYPE_NODE, "inet", NULL,
                   1359:                       NULL, 0, NULL, 0,
                   1360:                       CTL_NET, PF_INET, CTL_EOL);
1.116     atatat   1361:        sysctl_createv(clog, 0, NULL, NULL,
                   1362:                       CTLFLAG_PERMANENT,
1.122     atatat   1363:                       CTLTYPE_NODE, "udp",
                   1364:                       SYSCTL_DESCR("UDPv4 related settings"),
1.114     atatat   1365:                       NULL, 0, NULL, 0,
                   1366:                       CTL_NET, PF_INET, IPPROTO_UDP, CTL_EOL);
                   1367:
1.116     atatat   1368:        sysctl_createv(clog, 0, NULL, NULL,
                   1369:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.122     atatat   1370:                       CTLTYPE_INT, "checksum",
1.123     heas     1371:                       SYSCTL_DESCR("Compute UDP checksums"),
1.114     atatat   1372:                       NULL, 0, &udpcksum, 0,
                   1373:                       CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_CHECKSUM,
                   1374:                       CTL_EOL);
1.116     atatat   1375:        sysctl_createv(clog, 0, NULL, NULL,
                   1376:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.122     atatat   1377:                       CTLTYPE_INT, "sendspace",
                   1378:                       SYSCTL_DESCR("Default UDP send buffer size"),
1.114     atatat   1379:                       NULL, 0, &udp_sendspace, 0,
                   1380:                       CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_SENDSPACE,
                   1381:                       CTL_EOL);
1.116     atatat   1382:        sysctl_createv(clog, 0, NULL, NULL,
                   1383:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.122     atatat   1384:                       CTLTYPE_INT, "recvspace",
                   1385:                       SYSCTL_DESCR("Default UDP receive buffer size"),
1.114     atatat   1386:                       NULL, 0, &udp_recvspace, 0,
                   1387:                       CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_RECVSPACE,
                   1388:                       CTL_EOL);
1.125     thorpej  1389:        sysctl_createv(clog, 0, NULL, NULL,
                   1390:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1391:                       CTLTYPE_INT, "do_loopback_cksum",
                   1392:                       SYSCTL_DESCR("Perform UDP checksum on loopback"),
                   1393:                       NULL, 0, &udp_do_loopback_cksum, 0,
                   1394:                       CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_LOOPBACKCKSUM,
                   1395:                       CTL_EOL);
1.132     atatat   1396:        sysctl_createv(clog, 0, NULL, NULL,
                   1397:                       CTLFLAG_PERMANENT,
1.134     atatat   1398:                       CTLTYPE_STRUCT, "pcblist",
1.132     atatat   1399:                       SYSCTL_DESCR("UDP protocol control block list"),
                   1400:                       sysctl_inpcblist, 0, &udbtable, 0,
                   1401:                       CTL_NET, PF_INET, IPPROTO_UDP, CTL_CREATE,
                   1402:                       CTL_EOL);
1.139     elad     1403:        sysctl_createv(clog, 0, NULL, NULL,
                   1404:                       CTLFLAG_PERMANENT,
                   1405:                       CTLTYPE_STRUCT, "stats",
                   1406:                       SYSCTL_DESCR("UDP statistics"),
                   1407:                       NULL, 0, &udpstat, sizeof(udpstat),
                   1408:                       CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_STATS,
                   1409:                       CTL_EOL);
1.1       cgd      1410: }
1.72      itojun   1411: #endif
1.130     manu     1412:
                   1413: #if (defined INET && defined IPSEC_NAT_T)
                   1414: /*
                   1415:  * Returns:
                   1416:  * 1 if the packet was processed
                   1417:  * 0 if normal UDP processing should take place
1.144     manu     1418:  * -1 if an error occurent and m was freed
1.130     manu     1419:  */
                   1420: static int
1.151     christos 1421: udp4_espinudp(struct mbuf **mp, int off, struct sockaddr *src __unused,
                   1422:     struct socket *so)
1.130     manu     1423: {
                   1424:        size_t len;
                   1425:        caddr_t data;
                   1426:        struct inpcb *inp;
                   1427:        size_t skip = 0;
                   1428:        size_t minlen;
                   1429:        size_t iphdrlen;
                   1430:        struct ip *ip;
                   1431:        struct mbuf *n;
1.136     manu     1432:        struct m_tag *tag;
                   1433:        struct udphdr *udphdr;
                   1434:        u_int16_t sport, dport;
1.144     manu     1435:        struct mbuf *m = *mp;
1.130     manu     1436:
1.131     perry    1437:        /*
1.130     manu     1438:         * Collapse the mbuf chain if the first mbuf is too short
                   1439:         * The longest case is: UDP + non ESP marker + ESP
                   1440:         */
                   1441:        minlen = off + sizeof(u_int64_t) + sizeof(struct esp);
                   1442:        if (minlen > m->m_pkthdr.len)
                   1443:                minlen = m->m_pkthdr.len;
                   1444:
                   1445:        if (m->m_len < minlen) {
1.144     manu     1446:                if ((*mp = m_pullup(m, minlen)) == NULL) {
1.130     manu     1447:                        printf("udp4_espinudp: m_pullup failed\n");
1.144     manu     1448:                        return -1;
1.130     manu     1449:                }
1.144     manu     1450:                m = *mp;
1.130     manu     1451:        }
                   1452:
1.131     perry    1453:        len = m->m_len - off;
1.130     manu     1454:        data = mtod(m, caddr_t) + off;
                   1455:        inp = sotoinpcb(so);
                   1456:
                   1457:        /* Ignore keepalive packets */
                   1458:        if ((len == 1) && (data[0] == '\xff')) {
                   1459:                return 1;
                   1460:        }
                   1461:
1.131     perry    1462:        /*
                   1463:         * Check that the payload is long enough to hold
1.130     manu     1464:         * an ESP header and compute the length of encapsulation
1.131     perry    1465:         * header to remove
1.130     manu     1466:         */
                   1467:        if (inp->inp_flags & INP_ESPINUDP) {
                   1468:                u_int32_t *st = (u_int32_t *)data;
                   1469:
                   1470:                if ((len <= sizeof(struct esp)) || (*st == 0))
                   1471:                        return 0; /* Normal UDP processing */
                   1472:
                   1473:                skip = sizeof(struct udphdr);
                   1474:        }
                   1475:
                   1476:        if (inp->inp_flags & INP_ESPINUDP_NON_IKE) {
1.142     kleink   1477:                u_int32_t *st = (u_int32_t *)data;
1.130     manu     1478:
                   1479:                if ((len <= sizeof(u_int64_t) + sizeof(struct esp))
1.142     kleink   1480:                    || ((st[0] | st[1]) != 0))
1.130     manu     1481:                        return 0; /* Normal UDP processing */
1.131     perry    1482:
1.130     manu     1483:                skip = sizeof(struct udphdr) + sizeof(u_int64_t);
                   1484:        }
                   1485:
                   1486:        /*
1.136     manu     1487:         * Get the UDP ports. They are handled in network
                   1488:         * order everywhere in IPSEC_NAT_T code.
                   1489:         */
                   1490:        udphdr = (struct udphdr *)(data - skip);
                   1491:        sport = udphdr->uh_sport;
                   1492:        dport = udphdr->uh_dport;
                   1493:
                   1494:        /*
1.130     manu     1495:         * Remove the UDP header (and possibly the non ESP marker)
                   1496:         * IP header lendth is iphdrlen
1.131     perry    1497:         * Before:
1.130     manu     1498:         *   <--- off --->
                   1499:         *   +----+------+-----+
                   1500:         *   | IP |  UDP | ESP |
                   1501:         *   +----+------+-----+
                   1502:         *        <-skip->
                   1503:         * After:
                   1504:         *          +----+-----+
                   1505:         *          | IP | ESP |
                   1506:         *          +----+-----+
                   1507:         *   <-skip->
                   1508:         */
                   1509:        iphdrlen = off - sizeof(struct udphdr);
                   1510:        memmove(mtod(m, caddr_t) + skip, mtod(m, caddr_t), iphdrlen);
                   1511:        m_adj(m, skip);
                   1512:
                   1513:        ip = mtod(m, struct ip *);
                   1514:        ip->ip_len = htons(ntohs(ip->ip_len) - skip);
                   1515:        ip->ip_p = IPPROTO_ESP;
                   1516:
                   1517:        /*
1.131     perry    1518:         * Copy the mbuf to avoid multiple free, as both
                   1519:         * esp4_input (which we call) and udp_input (which
1.130     manu     1520:         * called us) free the mbuf.
                   1521:         */
                   1522:        if ((n = m_dup(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
                   1523:                printf("udp4_espinudp: m_dup failed\n");
                   1524:                return 0;
                   1525:        }
                   1526:
1.136     manu     1527:        /*
                   1528:         * Add a PACKET_TAG_IPSEC_NAT_T_PORT tag to remember
                   1529:         * the source UDP port. This is required if we want
                   1530:         * to select the right SPD for multiple hosts behind
                   1531:         * same NAT
                   1532:         */
1.137     manu     1533:        if ((tag = m_tag_get(PACKET_TAG_IPSEC_NAT_T_PORTS,
                   1534:            sizeof(sport) + sizeof(dport), M_DONTWAIT)) == NULL) {
                   1535:                printf("udp4_espinudp: m_tag_get failed\n");
1.138     manu     1536:                m_freem(n);
1.137     manu     1537:                return 0;
                   1538:        }
1.136     manu     1539:        ((u_int16_t *)(tag + 1))[0] = sport;
                   1540:        ((u_int16_t *)(tag + 1))[1] = dport;
                   1541:        m_tag_prepend(n, tag);
                   1542:
1.147     christos 1543: #ifdef FAST_IPSEC
                   1544:        ipsec4_common_input(n, iphdrlen);
                   1545: #else
1.130     manu     1546:        esp4_input(n, iphdrlen);
1.147     christos 1547: #endif
1.130     manu     1548:
                   1549:        /* We handled it, it shoudln't be handled by UDP */
                   1550:        return 1;
                   1551: }
                   1552: #endif

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