[BACK]Return to udp_usrreq.c CVS log [TXT][DIR] Up to [cvs.NetBSD.org] / src / sys / netinet

Annotation of src/sys/netinet/udp_usrreq.c, Revision 1.145

1.145   ! christos    1: /*     $NetBSD: udp_usrreq.c,v 1.144 2005/12/09 15:36:34 manu 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>
1.145   ! christos   64: __KERNEL_RCSID(0, "$NetBSD: udp_usrreq.c,v 1.144 2005/12/09 15:36:34 manu 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:
1.130     manu       98: #ifdef IPSEC_NAT_T
                     99: #include <netinet6/ipsec.h>
                    100: #include <netinet6/esp.h>
                    101: #endif
                    102:
1.53      itojun    103: #ifdef INET6
                    104: #include <netinet/ip6.h>
                    105: #include <netinet/icmp6.h>
                    106: #include <netinet6/ip6_var.h>
                    107: #include <netinet6/in6_pcb.h>
                    108: #include <netinet6/udp6_var.h>
                    109: #endif
                    110:
                    111: #ifndef INET6
                    112: /* always need ip6.h for IP6_EXTHDR_GET */
                    113: #include <netinet/ip6.h>
                    114: #endif
                    115:
1.76      itojun    116: #include "faith.h"
                    117: #if defined(NFAITH) && NFAITH > 0
                    118: #include <net/if_faith.h>
                    119: #endif
                    120:
1.27      christos  121: #include <machine/stdarg.h>
                    122:
1.105     jonathan  123: #ifdef FAST_IPSEC
                    124: #include <netipsec/ipsec.h>
1.121     jonathan  125: #include <netipsec/ipsec_var.h>                        /* XXX ipsecstat namespace */
1.105     jonathan  126: #ifdef INET6
                    127: #include <netipsec/ipsec6.h>
                    128: #endif
                    129: #endif /* FAST_IPSEC*/
                    130:
1.48      itojun    131: #ifdef IPSEC
                    132: #include <netinet6/ipsec.h>
                    133: #include <netkey/key.h>
                    134: #endif /*IPSEC*/
                    135:
1.64      ws        136: #ifdef IPKDB
                    137: #include <ipkdb/ipkdb.h>
                    138: #endif
                    139:
1.8       mycroft   140: /*
                    141:  * UDP protocol implementation.
                    142:  * Per RFC 768, August, 1980.
                    143:  */
                    144: #ifndef        COMPAT_42
                    145: int    udpcksum = 1;
                    146: #else
                    147: int    udpcksum = 0;           /* XXX */
                    148: #endif
1.141     yamt      149: int    udp_do_loopback_cksum = 0;
1.93      matt      150:
                    151: struct inpcbtable udbtable;
                    152: struct udpstat udpstat;
1.8       mycroft   153:
1.72      itojun    154: #ifdef INET
1.130     manu      155: #ifdef IPSEC_NAT_T
1.144     manu      156: static int udp4_espinudp (struct mbuf **, int, struct sockaddr *,
1.130     manu      157:        struct socket *);
                    158: #endif
1.119     matt      159: static void udp4_sendup (struct mbuf *, int, struct sockaddr *,
                    160:        struct socket *);
                    161: static int udp4_realinput (struct sockaddr_in *, struct sockaddr_in *,
1.144     manu      162:        struct mbuf **, int);
1.129     yamt      163: static int udp4_input_checksum(struct mbuf *, const struct udphdr *, int, int);
1.72      itojun    164: #endif
1.53      itojun    165: #ifdef INET6
1.119     matt      166: static void udp6_sendup (struct mbuf *, int, struct sockaddr *,
                    167:        struct socket *);
                    168: static int udp6_realinput (int, struct sockaddr_in6 *,
                    169:        struct sockaddr_in6 *, struct mbuf *, int);
1.129     yamt      170: static int udp6_input_checksum(struct mbuf *, const struct udphdr *, int, int);
1.53      itojun    171: #endif
1.72      itojun    172: #ifdef INET
1.119     matt      173: static void udp_notify (struct inpcb *, int);
1.72      itojun    174: #endif
1.7       mycroft   175:
1.26      mycroft   176: #ifndef UDBHASHSIZE
                    177: #define        UDBHASHSIZE     128
                    178: #endif
                    179: int    udbhashsize = UDBHASHSIZE;
                    180:
1.98      matt      181: #ifdef MBUFTRACE
                    182: struct mowner udp_mowner = { "udp" };
                    183: struct mowner udp_rx_mowner = { "udp", "rx" };
                    184: struct mowner udp_tx_mowner = { "udp", "tx" };
                    185: #endif
                    186:
1.78      thorpej   187: #ifdef UDP_CSUM_COUNTERS
                    188: #include <sys/device.h>
                    189:
1.140     yamt      190: #if defined(INET)
1.78      thorpej   191: struct evcnt udp_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    192:     NULL, "udp", "hwcsum bad");
                    193: struct evcnt udp_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    194:     NULL, "udp", "hwcsum ok");
                    195: struct evcnt udp_hwcsum_data = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    196:     NULL, "udp", "hwcsum data");
                    197: struct evcnt udp_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    198:     NULL, "udp", "swcsum");
                    199:
1.120     matt      200: EVCNT_ATTACH_STATIC(udp_hwcsum_bad);
                    201: EVCNT_ATTACH_STATIC(udp_hwcsum_ok);
                    202: EVCNT_ATTACH_STATIC(udp_hwcsum_data);
                    203: EVCNT_ATTACH_STATIC(udp_swcsum);
1.140     yamt      204: #endif /* defined(INET) */
                    205:
                    206: #if defined(INET6)
                    207: struct evcnt udp6_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    208:     NULL, "udp6", "hwcsum bad");
                    209: struct evcnt udp6_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    210:     NULL, "udp6", "hwcsum ok");
                    211: struct evcnt udp6_hwcsum_data = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    212:     NULL, "udp6", "hwcsum data");
                    213: struct evcnt udp6_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    214:     NULL, "udp6", "swcsum");
                    215:
                    216: EVCNT_ATTACH_STATIC(udp6_hwcsum_bad);
                    217: EVCNT_ATTACH_STATIC(udp6_hwcsum_ok);
                    218: EVCNT_ATTACH_STATIC(udp6_hwcsum_data);
                    219: EVCNT_ATTACH_STATIC(udp6_swcsum);
                    220: #endif /* defined(INET6) */
                    221:
                    222: #define        UDP_CSUM_COUNTER_INCR(ev)       (ev)->ev_count++
1.120     matt      223:
1.78      thorpej   224: #else
                    225:
                    226: #define        UDP_CSUM_COUNTER_INCR(ev)       /* nothing */
                    227:
                    228: #endif /* UDP_CSUM_COUNTERS */
                    229:
1.7       mycroft   230: void
1.119     matt      231: udp_init(void)
1.1       cgd       232: {
1.18      mycroft   233:
1.35      mycroft   234:        in_pcbinit(&udbtable, udbhashsize, udbhashsize);
1.78      thorpej   235:
1.98      matt      236:        MOWNER_ATTACH(&udp_tx_mowner);
                    237:        MOWNER_ATTACH(&udp_rx_mowner);
                    238:        MOWNER_ATTACH(&udp_mowner);
1.1       cgd       239: }
                    240:
1.129     yamt      241: /*
                    242:  * Checksum extended UDP header and data.
                    243:  */
                    244:
                    245: int
                    246: udp_input_checksum(int af, struct mbuf *m, const struct udphdr *uh,
                    247:     int iphlen, int len)
                    248: {
                    249:
                    250:        switch (af) {
1.72      itojun    251: #ifdef INET
1.129     yamt      252:        case AF_INET:
                    253:                return udp4_input_checksum(m, uh, iphlen, len);
                    254: #endif
                    255: #ifdef INET6
                    256:        case AF_INET6:
                    257:                return udp6_input_checksum(m, uh, iphlen, len);
                    258: #endif
                    259:        }
                    260: #ifdef DIAGNOSTIC
                    261:        panic("udp_input_checksum: unknown af %d", af);
                    262: #endif
                    263:        /* NOTREACHED */
                    264:        return -1;
                    265: }
                    266:
                    267: #ifdef INET
                    268:
                    269: /*
                    270:  * Checksum extended UDP header and data.
                    271:  */
                    272:
                    273: static int
                    274: udp4_input_checksum(struct mbuf *m, const struct udphdr *uh,
                    275:     int iphlen, int len)
                    276: {
                    277:
                    278:        /*
                    279:         * XXX it's better to record and check if this mbuf is
                    280:         * already checked.
                    281:         */
                    282:
                    283:        if (uh->uh_sum == 0)
                    284:                return 0;
                    285:
                    286:        switch (m->m_pkthdr.csum_flags &
                    287:            ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_UDPv4) |
                    288:            M_CSUM_TCP_UDP_BAD | M_CSUM_DATA)) {
                    289:        case M_CSUM_UDPv4|M_CSUM_TCP_UDP_BAD:
                    290:                UDP_CSUM_COUNTER_INCR(&udp_hwcsum_bad);
                    291:                goto badcsum;
                    292:
                    293:        case M_CSUM_UDPv4|M_CSUM_DATA: {
                    294:                u_int32_t hw_csum = m->m_pkthdr.csum_data;
                    295:
                    296:                UDP_CSUM_COUNTER_INCR(&udp_hwcsum_data);
                    297:                if (m->m_pkthdr.csum_flags & M_CSUM_NO_PSEUDOHDR) {
                    298:                        const struct ip *ip =
                    299:                            mtod(m, const struct ip *);
                    300:
                    301:                        hw_csum = in_cksum_phdr(ip->ip_src.s_addr,
                    302:                            ip->ip_dst.s_addr,
                    303:                            htons(hw_csum + len + IPPROTO_UDP));
                    304:                }
                    305:                if ((hw_csum ^ 0xffff) != 0)
                    306:                        goto badcsum;
                    307:                break;
                    308:        }
                    309:
                    310:        case M_CSUM_UDPv4:
                    311:                /* Checksum was okay. */
                    312:                UDP_CSUM_COUNTER_INCR(&udp_hwcsum_ok);
                    313:                break;
                    314:
                    315:        default:
                    316:                /*
                    317:                 * Need to compute it ourselves.  Maybe skip checksum
                    318:                 * on loopback interfaces.
                    319:                 */
                    320:                if (__predict_true(!(m->m_pkthdr.rcvif->if_flags &
                    321:                                     IFF_LOOPBACK) ||
                    322:                                   udp_do_loopback_cksum)) {
                    323:                        UDP_CSUM_COUNTER_INCR(&udp_swcsum);
                    324:                        if (in4_cksum(m, IPPROTO_UDP, iphlen, len) != 0)
                    325:                                goto badcsum;
                    326:                }
                    327:                break;
                    328:        }
                    329:
                    330:        return 0;
                    331:
                    332: badcsum:
                    333:        udpstat.udps_badsum++;
                    334:        return -1;
                    335: }
                    336:
1.7       mycroft   337: void
1.27      christos  338: udp_input(struct mbuf *m, ...)
1.1       cgd       339: {
1.53      itojun    340:        va_list ap;
                    341:        struct sockaddr_in src, dst;
                    342:        struct ip *ip;
                    343:        struct udphdr *uh;
1.97      simonb    344:        int iphlen;
1.53      itojun    345:        int len;
                    346:        int n;
1.96      itojun    347:        u_int16_t ip_len;
1.53      itojun    348:
                    349:        va_start(ap, m);
                    350:        iphlen = va_arg(ap, int);
1.97      simonb    351:        (void)va_arg(ap, int);          /* ignore value, advance ap */
1.53      itojun    352:        va_end(ap);
                    353:
1.98      matt      354:        MCLAIM(m, &udp_rx_mowner);
1.53      itojun    355:        udpstat.udps_ipackets++;
                    356:
                    357:        /*
                    358:         * Get IP and UDP header together in first mbuf.
                    359:         */
                    360:        ip = mtod(m, struct ip *);
                    361:        IP6_EXTHDR_GET(uh, struct udphdr *, m, iphlen, sizeof(struct udphdr));
                    362:        if (uh == NULL) {
                    363:                udpstat.udps_hdrops++;
                    364:                return;
                    365:        }
1.95      thorpej   366:        KASSERT(UDP_HDR_ALIGNED_P(uh));
1.53      itojun    367:
1.57      itojun    368:        /* destination port of 0 is illegal, based on RFC768. */
                    369:        if (uh->uh_dport == 0)
                    370:                goto bad;
                    371:
1.53      itojun    372:        /*
                    373:         * Make mbuf data length reflect UDP length.
                    374:         * If not enough data to reflect UDP length, drop.
                    375:         */
1.96      itojun    376:        ip_len = ntohs(ip->ip_len);
1.53      itojun    377:        len = ntohs((u_int16_t)uh->uh_ulen);
1.96      itojun    378:        if (ip_len != iphlen + len) {
                    379:                if (ip_len < iphlen + len || len < sizeof(struct udphdr)) {
1.53      itojun    380:                        udpstat.udps_badlen++;
                    381:                        goto bad;
                    382:                }
1.96      itojun    383:                m_adj(m, iphlen + len - ip_len);
1.53      itojun    384:        }
                    385:
                    386:        /*
                    387:         * Checksum extended UDP header and data.
                    388:         */
1.129     yamt      389:        if (udp4_input_checksum(m, uh, iphlen, len))
                    390:                goto badcsum;
1.53      itojun    391:
                    392:        /* construct source and dst sockaddrs. */
                    393:        bzero(&src, sizeof(src));
                    394:        src.sin_family = AF_INET;
                    395:        src.sin_len = sizeof(struct sockaddr_in);
                    396:        bcopy(&ip->ip_src, &src.sin_addr, sizeof(src.sin_addr));
                    397:        src.sin_port = uh->uh_sport;
                    398:        bzero(&dst, sizeof(dst));
                    399:        dst.sin_family = AF_INET;
                    400:        dst.sin_len = sizeof(struct sockaddr_in);
                    401:        bcopy(&ip->ip_dst, &dst.sin_addr, sizeof(dst.sin_addr));
                    402:        dst.sin_port = uh->uh_dport;
                    403:
1.144     manu      404:        if ((n = udp4_realinput(&src, &dst, &m, iphlen)) == -1) {
                    405:                udpstat.udps_hdrops++;
                    406:                return;
                    407:        }
1.53      itojun    408: #ifdef INET6
                    409:        if (IN_MULTICAST(ip->ip_dst.s_addr) || n == 0) {
                    410:                struct sockaddr_in6 src6, dst6;
                    411:
                    412:                bzero(&src6, sizeof(src6));
                    413:                src6.sin6_family = AF_INET6;
                    414:                src6.sin6_len = sizeof(struct sockaddr_in6);
                    415:                src6.sin6_addr.s6_addr[10] = src6.sin6_addr.s6_addr[11] = 0xff;
                    416:                bcopy(&ip->ip_src, &src6.sin6_addr.s6_addr[12],
                    417:                        sizeof(ip->ip_src));
                    418:                src6.sin6_port = uh->uh_sport;
                    419:                bzero(&dst6, sizeof(dst6));
                    420:                dst6.sin6_family = AF_INET6;
                    421:                dst6.sin6_len = sizeof(struct sockaddr_in6);
                    422:                dst6.sin6_addr.s6_addr[10] = dst6.sin6_addr.s6_addr[11] = 0xff;
                    423:                bcopy(&ip->ip_dst, &dst6.sin6_addr.s6_addr[12],
                    424:                        sizeof(ip->ip_dst));
                    425:                dst6.sin6_port = uh->uh_dport;
                    426:
                    427:                n += udp6_realinput(AF_INET, &src6, &dst6, m, iphlen);
                    428:        }
                    429: #endif
                    430:
                    431:        if (n == 0) {
                    432:                if (m->m_flags & (M_BCAST | M_MCAST)) {
                    433:                        udpstat.udps_noportbcast++;
                    434:                        goto bad;
                    435:                }
1.61      itojun    436:                udpstat.udps_noport++;
1.64      ws        437: #ifdef IPKDB
1.53      itojun    438:                if (checkipkdb(&ip->ip_src, uh->uh_sport, uh->uh_dport,
                    439:                                m, iphlen + sizeof(struct udphdr),
                    440:                                m->m_pkthdr.len - iphlen - sizeof(struct udphdr))) {
                    441:                        /*
                    442:                         * It was a debugger connect packet,
                    443:                         * just drop it now
                    444:                         */
                    445:                        goto bad;
                    446:                }
                    447: #endif
                    448:                icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0);
                    449:                m = NULL;
                    450:        }
                    451:
                    452: bad:
                    453:        if (m)
                    454:                m_freem(m);
1.78      thorpej   455:        return;
                    456:
                    457: badcsum:
                    458:        m_freem(m);
1.53      itojun    459: }
1.72      itojun    460: #endif
1.53      itojun    461:
                    462: #ifdef INET6
1.129     yamt      463: static int
                    464: udp6_input_checksum(struct mbuf *m, const struct udphdr *uh, int off, int len)
                    465: {
                    466:
1.140     yamt      467:        /*
                    468:         * XXX it's better to record and check if this mbuf is
                    469:         * already checked.
                    470:         */
                    471:
1.129     yamt      472:        if (__predict_false((m->m_flags & M_LOOP) && !udp_do_loopback_cksum)) {
                    473:                goto good;
                    474:        }
                    475:        if (uh->uh_sum == 0) {
                    476:                udp6stat.udp6s_nosum++;
                    477:                goto bad;
                    478:        }
1.140     yamt      479:
                    480:        switch (m->m_pkthdr.csum_flags &
                    481:            ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_UDPv6) |
                    482:            M_CSUM_TCP_UDP_BAD | M_CSUM_DATA)) {
                    483:        case M_CSUM_UDPv6|M_CSUM_TCP_UDP_BAD:
                    484:                UDP_CSUM_COUNTER_INCR(&udp6_hwcsum_bad);
1.129     yamt      485:                udp6stat.udp6s_badsum++;
                    486:                goto bad;
1.140     yamt      487:
                    488: #if 0 /* notyet */
                    489:        case M_CSUM_UDPv6|M_CSUM_DATA:
                    490: #endif
                    491:
                    492:        case M_CSUM_UDPv6:
                    493:                /* Checksum was okay. */
                    494:                UDP_CSUM_COUNTER_INCR(&udp6_hwcsum_ok);
                    495:                break;
                    496:
                    497:        default:
                    498:                /*
                    499:                 * Need to compute it ourselves.  Maybe skip checksum
                    500:                 * on loopback interfaces.
                    501:                 */
                    502:                UDP_CSUM_COUNTER_INCR(&udp6_swcsum);
                    503:                if (in6_cksum(m, IPPROTO_UDP, off, len) != 0) {
                    504:                        udp6stat.udp6s_badsum++;
                    505:                        goto bad;
                    506:                }
1.129     yamt      507:        }
                    508:
                    509: good:
                    510:        return 0;
                    511: bad:
                    512:        return -1;
                    513: }
                    514:
1.53      itojun    515: int
1.119     matt      516: udp6_input(struct mbuf **mp, int *offp, int proto)
1.53      itojun    517: {
                    518:        struct mbuf *m = *mp;
                    519:        int off = *offp;
                    520:        struct sockaddr_in6 src, dst;
                    521:        struct ip6_hdr *ip6;
                    522:        struct udphdr *uh;
                    523:        u_int32_t plen, ulen;
                    524:
1.76      itojun    525:        ip6 = mtod(m, struct ip6_hdr *);
                    526:
1.53      itojun    527: #if defined(NFAITH) && 0 < NFAITH
1.76      itojun    528:        if (faithprefix(&ip6->ip6_dst)) {
                    529:                /* send icmp6 host unreach? */
                    530:                m_freem(m);
                    531:                return IPPROTO_DONE;
1.53      itojun    532:        }
                    533: #endif
                    534:
                    535:        udp6stat.udp6s_ipackets++;
                    536:
                    537:        /* check for jumbogram is done in ip6_input.  we can trust pkthdr.len */
                    538:        plen = m->m_pkthdr.len - off;
                    539:        IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(struct udphdr));
                    540:        if (uh == NULL) {
                    541:                ip6stat.ip6s_tooshort++;
                    542:                return IPPROTO_DONE;
                    543:        }
1.95      thorpej   544:        KASSERT(UDP_HDR_ALIGNED_P(uh));
1.53      itojun    545:        ulen = ntohs((u_short)uh->uh_ulen);
1.69      itojun    546:        /*
                    547:         * RFC2675 section 4: jumbograms will have 0 in the UDP header field,
                    548:         * iff payload length > 0xffff.
                    549:         */
1.53      itojun    550:        if (ulen == 0 && plen > 0xffff)
                    551:                ulen = plen;
                    552:
                    553:        if (plen != ulen) {
                    554:                udp6stat.udp6s_badlen++;
1.54      itojun    555:                goto bad;
                    556:        }
                    557:
1.57      itojun    558:        /* destination port of 0 is illegal, based on RFC768. */
                    559:        if (uh->uh_dport == 0)
                    560:                goto bad;
                    561:
1.54      itojun    562:        /* Be proactive about malicious use of IPv4 mapped address */
                    563:        if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
                    564:            IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
                    565:                /* XXX stat */
1.53      itojun    566:                goto bad;
                    567:        }
                    568:
                    569:        /*
1.125     thorpej   570:         * Checksum extended UDP header and data.  Maybe skip checksum
                    571:         * on loopback interfaces.
1.53      itojun    572:         */
1.129     yamt      573:        if (udp6_input_checksum(m, uh, off, ulen))
                    574:                goto bad;
1.53      itojun    575:
                    576:        /*
                    577:         * Construct source and dst sockaddrs.
                    578:         * Note that ifindex (s6_addr16[1]) is already filled.
                    579:         */
                    580:        bzero(&src, sizeof(src));
                    581:        src.sin6_family = AF_INET6;
                    582:        src.sin6_len = sizeof(struct sockaddr_in6);
1.69      itojun    583:        /* KAME hack: recover scopeid */
                    584:        (void)in6_recoverscope(&src, &ip6->ip6_src, m->m_pkthdr.rcvif);
1.53      itojun    585:        src.sin6_port = uh->uh_sport;
                    586:        bzero(&dst, sizeof(dst));
                    587:        dst.sin6_family = AF_INET6;
                    588:        dst.sin6_len = sizeof(struct sockaddr_in6);
1.69      itojun    589:        /* KAME hack: recover scopeid */
                    590:        (void)in6_recoverscope(&dst, &ip6->ip6_dst, m->m_pkthdr.rcvif);
1.53      itojun    591:        dst.sin6_port = uh->uh_dport;
                    592:
                    593:        if (udp6_realinput(AF_INET6, &src, &dst, m, off) == 0) {
                    594:                if (m->m_flags & M_MCAST) {
                    595:                        udp6stat.udp6s_noportmcast++;
                    596:                        goto bad;
                    597:                }
1.61      itojun    598:                udp6stat.udp6s_noport++;
1.53      itojun    599:                icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
                    600:                m = NULL;
                    601:        }
                    602:
                    603: bad:
                    604:        if (m)
                    605:                m_freem(m);
                    606:        return IPPROTO_DONE;
                    607: }
                    608: #endif
                    609:
1.72      itojun    610: #ifdef INET
1.53      itojun    611: static void
1.119     matt      612: udp4_sendup(struct mbuf *m, int off /* offset of data portion */,
                    613:        struct sockaddr *src, struct socket *so)
1.53      itojun    614: {
                    615:        struct mbuf *opts = NULL;
                    616:        struct mbuf *n;
                    617:        struct inpcb *inp = NULL;
                    618:
                    619:        if (!so)
                    620:                return;
                    621:        switch (so->so_proto->pr_domain->dom_family) {
                    622:        case AF_INET:
                    623:                inp = sotoinpcb(so);
                    624:                break;
                    625: #ifdef INET6
                    626:        case AF_INET6:
                    627:                break;
                    628: #endif
                    629:        default:
                    630:                return;
                    631:        }
                    632:
1.105     jonathan  633: #if defined(IPSEC) || defined(FAST_IPSEC)
1.53      itojun    634:        /* check AH/ESP integrity. */
                    635:        if (so != NULL && ipsec4_in_reject_so(m, so)) {
                    636:                ipsecstat.in_polvio++;
1.110     itojun    637:                if ((n = m_copy(m, 0, M_COPYALL)) != NULL)
                    638:                        icmp_error(n, ICMP_UNREACH, ICMP_UNREACH_ADMIN_PROHIBIT,
                    639:                            0, 0);
1.53      itojun    640:                return;
                    641:        }
                    642: #endif /*IPSEC*/
                    643:
                    644:        if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
                    645:                if (inp && (inp->inp_flags & INP_CONTROLOPTS
                    646:                         || so->so_options & SO_TIMESTAMP)) {
                    647:                        struct ip *ip = mtod(n, struct ip *);
                    648:                        ip_savecontrol(inp, &opts, ip, n);
                    649:                }
                    650:
                    651:                m_adj(n, off);
                    652:                if (sbappendaddr(&so->so_rcv, src, n,
                    653:                                opts) == 0) {
                    654:                        m_freem(n);
                    655:                        if (opts)
                    656:                                m_freem(opts);
1.124     darrenr   657:                        so->so_rcv.sb_overflowed++;
1.81      enami     658:                        udpstat.udps_fullsock++;
1.53      itojun    659:                } else
                    660:                        sorwakeup(so);
                    661:        }
                    662: }
1.72      itojun    663: #endif
1.53      itojun    664:
                    665: #ifdef INET6
                    666: static void
1.119     matt      667: udp6_sendup(struct mbuf *m, int off /* offset of data portion */,
                    668:        struct sockaddr *src, struct socket *so)
1.53      itojun    669: {
                    670:        struct mbuf *opts = NULL;
                    671:        struct mbuf *n;
                    672:        struct in6pcb *in6p = NULL;
                    673:
                    674:        if (!so)
                    675:                return;
                    676:        if (so->so_proto->pr_domain->dom_family != AF_INET6)
                    677:                return;
                    678:        in6p = sotoin6pcb(so);
                    679:
1.105     jonathan  680: #if defined(IPSEC) || defined(FAST_IPSEC)
1.53      itojun    681:        /* check AH/ESP integrity. */
                    682:        if (so != NULL && ipsec6_in_reject_so(m, so)) {
                    683:                ipsec6stat.in_polvio++;
1.111     mycroft   684:                if ((n = m_copy(m, 0, M_COPYALL)) != NULL)
1.110     itojun    685:                        icmp6_error(n, ICMP6_DST_UNREACH,
                    686:                            ICMP6_DST_UNREACH_ADMIN, 0);
1.53      itojun    687:                return;
                    688:        }
                    689: #endif /*IPSEC*/
                    690:
                    691:        if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
                    692:                if (in6p && (in6p->in6p_flags & IN6P_CONTROLOPTS
                    693:                          || in6p->in6p_socket->so_options & SO_TIMESTAMP)) {
                    694:                        struct ip6_hdr *ip6 = mtod(n, struct ip6_hdr *);
                    695:                        ip6_savecontrol(in6p, &opts, ip6, n);
                    696:                }
                    697:
                    698:                m_adj(n, off);
                    699:                if (sbappendaddr(&so->so_rcv, src, n, opts) == 0) {
                    700:                        m_freem(n);
                    701:                        if (opts)
                    702:                                m_freem(opts);
1.124     darrenr   703:                        so->so_rcv.sb_overflowed++;
1.53      itojun    704:                        udp6stat.udp6s_fullsock++;
                    705:                } else
                    706:                        sorwakeup(so);
                    707:        }
                    708: }
                    709: #endif
                    710:
1.72      itojun    711: #ifdef INET
1.53      itojun    712: static int
1.119     matt      713: udp4_realinput(struct sockaddr_in *src, struct sockaddr_in *dst,
1.144     manu      714:        struct mbuf **mp, int off /* offset of udphdr */)
1.53      itojun    715: {
                    716:        u_int16_t *sport, *dport;
                    717:        int rcvcnt;
                    718:        struct in_addr *src4, *dst4;
1.109     itojun    719:        struct inpcb_hdr *inph;
1.53      itojun    720:        struct inpcb *inp;
1.144     manu      721:        struct mbuf *m = *mp;
1.53      itojun    722:
                    723:        rcvcnt = 0;
                    724:        off += sizeof(struct udphdr);   /* now, offset of payload */
                    725:
                    726:        if (src->sin_family != AF_INET || dst->sin_family != AF_INET)
                    727:                goto bad;
                    728:
                    729:        src4 = &src->sin_addr;
                    730:        sport = &src->sin_port;
                    731:        dst4 = &dst->sin_addr;
                    732:        dport = &dst->sin_port;
                    733:
1.73      itojun    734:        if (IN_MULTICAST(dst4->s_addr) ||
1.53      itojun    735:            in_broadcast(*dst4, m->m_pkthdr.rcvif)) {
                    736:                /*
                    737:                 * Deliver a multicast or broadcast datagram to *all* sockets
                    738:                 * for which the local and remote addresses and ports match
                    739:                 * those of the incoming datagram.  This allows more than
                    740:                 * one process to receive multi/broadcasts on the same port.
                    741:                 * (This really ought to be done for unicast datagrams as
                    742:                 * well, but that would cause problems with existing
                    743:                 * applications that open both address-specific sockets and
                    744:                 * a wildcard socket listening to the same port -- they would
                    745:                 * end up receiving duplicates of every unicast datagram.
                    746:                 * Those applications open the multiple sockets to overcome an
                    747:                 * inadequacy of the UDP socket interface, but for backwards
                    748:                 * compatibility we avoid the problem here rather than
                    749:                 * fixing the interface.  Maybe 4.5BSD will remedy this?)
                    750:                 */
                    751:
                    752:                /*
1.92      itojun    753:                 * KAME note: traditionally we dropped udpiphdr from mbuf here.
1.71      itojun    754:                 * we need udpiphdr for IPsec processing so we do that later.
1.53      itojun    755:                 */
                    756:                /*
                    757:                 * Locate pcb(s) for datagram.
                    758:                 */
1.109     itojun    759:                CIRCLEQ_FOREACH(inph, &udbtable.inpt_queue, inph_queue) {
                    760:                        inp = (struct inpcb *)inph;
                    761:                        if (inp->inp_af != AF_INET)
                    762:                                continue;
                    763:
1.53      itojun    764:                        if (inp->inp_lport != *dport)
                    765:                                continue;
                    766:                        if (!in_nullhost(inp->inp_laddr)) {
                    767:                                if (!in_hosteq(inp->inp_laddr, *dst4))
                    768:                                        continue;
                    769:                        }
                    770:                        if (!in_nullhost(inp->inp_faddr)) {
                    771:                                if (!in_hosteq(inp->inp_faddr, *src4) ||
                    772:                                    inp->inp_fport != *sport)
                    773:                                        continue;
                    774:                        }
                    775:
                    776:                        udp4_sendup(m, off, (struct sockaddr *)src,
                    777:                                inp->inp_socket);
                    778:                        rcvcnt++;
                    779:
                    780:                        /*
                    781:                         * Don't look for additional matches if this one does
                    782:                         * not have either the SO_REUSEPORT or SO_REUSEADDR
                    783:                         * socket options set.  This heuristic avoids searching
                    784:                         * through all pcbs in the common case of a non-shared
                    785:                         * port.  It assumes that an application will never
                    786:                         * clear these options after setting them.
                    787:                         */
                    788:                        if ((inp->inp_socket->so_options &
                    789:                            (SO_REUSEPORT|SO_REUSEADDR)) == 0)
                    790:                                break;
                    791:                }
                    792:        } else {
                    793:                /*
                    794:                 * Locate pcb for datagram.
                    795:                 */
                    796:                inp = in_pcblookup_connect(&udbtable, *src4, *sport, *dst4, *dport);
                    797:                if (inp == 0) {
                    798:                        ++udpstat.udps_pcbhashmiss;
                    799:                        inp = in_pcblookup_bind(&udbtable, *dst4, *dport);
1.82      itojun    800:                        if (inp == 0)
1.53      itojun    801:                                return rcvcnt;
                    802:                }
                    803:
1.130     manu      804: #ifdef IPSEC_NAT_T
                    805:                /* Handle ESP over UDP */
                    806:                if (inp->inp_flags & INP_ESPINUDP_ALL) {
                    807:                        struct sockaddr *sa = (struct sockaddr *)src;
                    808:
1.144     manu      809:                        switch(udp4_espinudp(mp, off, sa, inp->inp_socket)) {
                    810:                        case -1:        /* Error, m was freeed */
                    811:                                rcvcnt = -1;
                    812:                                goto bad;
                    813:                                break;
                    814:
                    815:                        case 1:         /* ESP over UDP */
1.130     manu      816:                                rcvcnt++;
                    817:                                goto bad;
1.144     manu      818:                                break;
                    819:
                    820:                        case 0:         /* plain UDP */
                    821:                        default:        /* Unexpected */
                    822:                                /*
                    823:                                 * Normal UDP processing will take place
                    824:                                 * m may have changed.
                    825:                                 */
                    826:                                m = *mp;
                    827:                                break;
1.130     manu      828:                        }
                    829:                }
                    830: #endif
                    831:
1.53      itojun    832:                udp4_sendup(m, off, (struct sockaddr *)src, inp->inp_socket);
                    833:                rcvcnt++;
                    834:        }
                    835:
                    836: bad:
                    837:        return rcvcnt;
                    838: }
1.72      itojun    839: #endif
1.53      itojun    840:
                    841: #ifdef INET6
                    842: static int
1.119     matt      843: udp6_realinput(int af, struct sockaddr_in6 *src, struct sockaddr_in6 *dst,
                    844:        struct mbuf *m, int off)
1.53      itojun    845: {
1.79      itojun    846:        u_int16_t sport, dport;
1.53      itojun    847:        int rcvcnt;
1.79      itojun    848:        struct in6_addr src6, dst6;
                    849:        const struct in_addr *dst4;
1.109     itojun    850:        struct inpcb_hdr *inph;
1.53      itojun    851:        struct in6pcb *in6p;
                    852:
                    853:        rcvcnt = 0;
                    854:        off += sizeof(struct udphdr);   /* now, offset of payload */
                    855:
                    856:        if (af != AF_INET && af != AF_INET6)
                    857:                goto bad;
                    858:        if (src->sin6_family != AF_INET6 || dst->sin6_family != AF_INET6)
                    859:                goto bad;
                    860:
1.79      itojun    861:        in6_embedscope(&src6, src, NULL, NULL);
                    862:        sport = src->sin6_port;
                    863:        in6_embedscope(&dst6, dst, NULL, NULL);
                    864:        dport = dst->sin6_port;
1.88      itojun    865:        dst4 = (struct in_addr *)&dst->sin6_addr.s6_addr[12];
1.53      itojun    866:
1.79      itojun    867:        if (IN6_IS_ADDR_MULTICAST(&dst6) ||
                    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)) {
1.90      itojun    900:                                if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &dst6))
1.53      itojun    901:                                        continue;
1.92      itojun    902:                        } else {
1.79      itojun    903:                                if (IN6_IS_ADDR_V4MAPPED(&dst6) &&
1.85      itojun    904:                                    (in6p->in6p_flags & IN6P_IPV6_V6ONLY))
1.55      itojun    905:                                        continue;
                    906:                        }
1.53      itojun    907:                        if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
1.79      itojun    908:                                if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr,
                    909:                                    &src6) || in6p->in6p_fport != sport)
1.53      itojun    910:                                        continue;
1.92      itojun    911:                        } else {
1.79      itojun    912:                                if (IN6_IS_ADDR_V4MAPPED(&src6) &&
1.85      itojun    913:                                    (in6p->in6p_flags & IN6P_IPV6_V6ONLY))
1.55      itojun    914:                                        continue;
                    915:                        }
1.53      itojun    916:
                    917:                        udp6_sendup(m, off, (struct sockaddr *)src,
                    918:                                in6p->in6p_socket);
                    919:                        rcvcnt++;
                    920:
                    921:                        /*
                    922:                         * Don't look for additional matches if this one does
                    923:                         * not have either the SO_REUSEPORT or SO_REUSEADDR
                    924:                         * socket options set.  This heuristic avoids searching
                    925:                         * through all pcbs in the common case of a non-shared
                    926:                         * port.  It assumes that an application will never
                    927:                         * clear these options after setting them.
                    928:                         */
                    929:                        if ((in6p->in6p_socket->so_options &
                    930:                            (SO_REUSEPORT|SO_REUSEADDR)) == 0)
                    931:                                break;
                    932:                }
                    933:        } else {
                    934:                /*
                    935:                 * Locate pcb for datagram.
                    936:                 */
1.109     itojun    937:                in6p = in6_pcblookup_connect(&udbtable, &src6, sport,
1.79      itojun    938:                    &dst6, dport, 0);
1.53      itojun    939:                if (in6p == 0) {
                    940:                        ++udpstat.udps_pcbhashmiss;
1.109     itojun    941:                        in6p = in6_pcblookup_bind(&udbtable, &dst6, dport, 0);
1.82      itojun    942:                        if (in6p == 0)
1.53      itojun    943:                                return rcvcnt;
                    944:                }
                    945:
                    946:                udp6_sendup(m, off, (struct sockaddr *)src, in6p->in6p_socket);
                    947:                rcvcnt++;
                    948:        }
                    949:
                    950: bad:
                    951:        return rcvcnt;
                    952: }
                    953: #endif
1.1       cgd       954:
1.72      itojun    955: #ifdef INET
1.1       cgd       956: /*
                    957:  * Notify a udp user of an asynchronous error;
                    958:  * just wake up so that he can collect error status.
                    959:  */
1.7       mycroft   960: static void
1.119     matt      961: udp_notify(struct inpcb *inp, int errno)
1.1       cgd       962: {
                    963:        inp->inp_socket->so_error = errno;
                    964:        sorwakeup(inp->inp_socket);
                    965:        sowwakeup(inp->inp_socket);
                    966: }
                    967:
1.27      christos  968: void *
1.119     matt      969: udp_ctlinput(int cmd, struct sockaddr *sa, void *v)
1.1       cgd       970: {
1.66      augustss  971:        struct ip *ip = v;
                    972:        struct udphdr *uh;
1.119     matt      973:        void (*notify)(struct inpcb *, int) = udp_notify;
1.21      mycroft   974:        int errno;
1.1       cgd       975:
1.53      itojun    976:        if (sa->sa_family != AF_INET
                    977:         || sa->sa_len != sizeof(struct sockaddr_in))
1.51      itojun    978:                return NULL;
1.20      mycroft   979:        if ((unsigned)cmd >= PRC_NCMDS)
1.27      christos  980:                return NULL;
1.20      mycroft   981:        errno = inetctlerrmap[cmd];
1.18      mycroft   982:        if (PRC_IS_REDIRECT(cmd))
1.19      mycroft   983:                notify = in_rtchange, ip = 0;
1.18      mycroft   984:        else if (cmd == PRC_HOSTDEAD)
1.19      mycroft   985:                ip = 0;
1.23      cgd       986:        else if (errno == 0)
1.27      christos  987:                return NULL;
1.19      mycroft   988:        if (ip) {
1.1       cgd       989:                uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2));
1.34      mycroft   990:                in_pcbnotify(&udbtable, satosin(sa)->sin_addr, uh->uh_dport,
                    991:                    ip->ip_src, uh->uh_sport, errno, notify);
1.53      itojun    992:
                    993:                /* XXX mapped address case */
1.19      mycroft   994:        } else
1.34      mycroft   995:                in_pcbnotifyall(&udbtable, satosin(sa)->sin_addr, errno,
                    996:                    notify);
1.27      christos  997:        return NULL;
1.1       cgd       998: }
                    999:
1.7       mycroft  1000: int
1.131     perry    1001: udp_ctloutput(op, so, level, optname, mp)
1.130     manu     1002:        int op;
                   1003:        struct socket *so;
                   1004:        int level, optname;
                   1005:        struct mbuf **mp;
                   1006: {
                   1007:        int s;
                   1008:        int error = 0;
                   1009:        struct mbuf *m;
                   1010:        struct inpcb *inp;
                   1011:        int family;
                   1012:
                   1013:        family = so->so_proto->pr_domain->dom_family;
                   1014:
                   1015:        s = splsoftnet();
                   1016:        switch (family) {
                   1017: #ifdef INET
                   1018:        case PF_INET:
                   1019:                if (level != IPPROTO_UDP) {
                   1020:                        error = ip_ctloutput(op, so, level, optname, mp);
                   1021:                        goto end;
                   1022:                }
                   1023:                break;
                   1024: #endif
                   1025: #ifdef INET6
                   1026:        case PF_INET6:
                   1027:                if (level != IPPROTO_UDP) {
                   1028:                        error = ip6_ctloutput(op, so, level, optname, mp);
                   1029:                        goto end;
                   1030:                }
                   1031:                break;
                   1032: #endif
                   1033:        default:
                   1034:                error = EAFNOSUPPORT;
                   1035:                goto end;
                   1036:                break;
                   1037:        }
                   1038:
                   1039:
                   1040:        switch (op) {
                   1041:        case PRCO_SETOPT:
                   1042:                m = *mp;
                   1043:                inp = sotoinpcb(so);
                   1044:
                   1045:                switch (optname) {
                   1046:                case UDP_ENCAP:
                   1047:                        if (m == NULL || m->m_len < sizeof (int)) {
                   1048:                                error = EINVAL;
                   1049:                                goto end;
                   1050:                        }
1.131     perry    1051:
1.130     manu     1052:                        switch(*mtod(m, int *)) {
                   1053: #ifdef IPSEC_NAT_T
                   1054:                        case 0:
                   1055:                                inp->inp_flags &= ~INP_ESPINUDP_ALL;
                   1056:                                break;
                   1057:
                   1058:                        case UDP_ENCAP_ESPINUDP:
                   1059:                                inp->inp_flags &= ~INP_ESPINUDP_ALL;
                   1060:                                inp->inp_flags |= INP_ESPINUDP;
                   1061:                                break;
1.131     perry    1062:
1.130     manu     1063:                        case UDP_ENCAP_ESPINUDP_NON_IKE:
                   1064:                                inp->inp_flags &= ~INP_ESPINUDP_ALL;
                   1065:                                inp->inp_flags |= INP_ESPINUDP_NON_IKE;
                   1066:                                break;
                   1067: #endif
                   1068:                        default:
                   1069:                                error = EINVAL;
                   1070:                                goto end;
                   1071:                                break;
                   1072:                        }
                   1073:                        break;
                   1074:
                   1075:                default:
                   1076:                        error = ENOPROTOOPT;
                   1077:                        goto end;
                   1078:                        break;
                   1079:                }
                   1080:                break;
                   1081:
                   1082:        default:
                   1083:                error = EINVAL;
                   1084:                goto end;
                   1085:                break;
1.131     perry    1086:        }
                   1087:
1.130     manu     1088: end:
                   1089:        splx(s);
                   1090:        return error;
                   1091: }
1.131     perry    1092:
1.130     manu     1093:
                   1094: int
1.27      christos 1095: udp_output(struct mbuf *m, ...)
                   1096: {
1.66      augustss 1097:        struct inpcb *inp;
                   1098:        struct udpiphdr *ui;
1.125     thorpej  1099:        struct route *ro;
1.66      augustss 1100:        int len = m->m_pkthdr.len;
1.31      mycroft  1101:        int error = 0;
1.27      christos 1102:        va_list ap;
                   1103:
1.98      matt     1104:        MCLAIM(m, &udp_tx_mowner);
1.27      christos 1105:        va_start(ap, m);
                   1106:        inp = va_arg(ap, struct inpcb *);
                   1107:        va_end(ap);
1.1       cgd      1108:
                   1109:        /*
                   1110:         * Calculate data length and get a mbuf
                   1111:         * for UDP and IP headers.
                   1112:         */
1.13      mycroft  1113:        M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT);
                   1114:        if (m == 0) {
                   1115:                error = ENOBUFS;
1.39      thorpej  1116:                goto release;
                   1117:        }
                   1118:
                   1119:        /*
                   1120:         * Compute the packet length of the IP header, and
                   1121:         * punt if the length looks bogus.
                   1122:         */
1.96      itojun   1123:        if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) {
1.39      thorpej  1124:                error = EMSGSIZE;
1.13      mycroft  1125:                goto release;
                   1126:        }
1.1       cgd      1127:
                   1128:        /*
                   1129:         * Fill in mbuf with extended UDP header
                   1130:         * and addresses and length put into network format.
                   1131:         */
                   1132:        ui = mtod(m, struct udpiphdr *);
                   1133:        ui->ui_pr = IPPROTO_UDP;
                   1134:        ui->ui_src = inp->inp_laddr;
                   1135:        ui->ui_dst = inp->inp_faddr;
                   1136:        ui->ui_sport = inp->inp_lport;
                   1137:        ui->ui_dport = inp->inp_fport;
1.78      thorpej  1138:        ui->ui_ulen = htons((u_int16_t)len + sizeof(struct udphdr));
1.1       cgd      1139:
1.125     thorpej  1140:        ro = &inp->inp_route;
                   1141:
1.1       cgd      1142:        /*
1.78      thorpej  1143:         * Set up checksum and output datagram.
1.1       cgd      1144:         */
                   1145:        if (udpcksum) {
1.78      thorpej  1146:                /*
                   1147:                 * XXX Cache pseudo-header checksum part for
                   1148:                 * XXX "connected" UDP sockets.
                   1149:                 */
                   1150:                ui->ui_sum = in_cksum_phdr(ui->ui_src.s_addr,
                   1151:                    ui->ui_dst.s_addr, htons((u_int16_t)len +
                   1152:                    sizeof(struct udphdr) + IPPROTO_UDP));
1.135     yamt     1153:                m->m_pkthdr.csum_flags = M_CSUM_UDPv4;
1.78      thorpej  1154:                m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
                   1155:        } else
                   1156:                ui->ui_sum = 0;
1.96      itojun   1157:        ((struct ip *)ui)->ip_len = htons(sizeof (struct udpiphdr) + len);
1.1       cgd      1158:        ((struct ip *)ui)->ip_ttl = inp->inp_ip.ip_ttl; /* XXX */
                   1159:        ((struct ip *)ui)->ip_tos = inp->inp_ip.ip_tos; /* XXX */
                   1160:        udpstat.udps_opackets++;
1.48      itojun   1161:
1.125     thorpej  1162:        return (ip_output(m, inp->inp_options, ro,
1.12      mycroft  1163:            inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST),
1.107     itojun   1164:            inp->inp_moptions, inp->inp_socket));
1.1       cgd      1165:
                   1166: release:
                   1167:        m_freem(m);
                   1168:        return (error);
                   1169: }
                   1170:
1.42      thorpej  1171: int    udp_sendspace = 9216;           /* really max datagram size */
                   1172: int    udp_recvspace = 40 * (1024 + sizeof(struct sockaddr_in));
1.1       cgd      1173:                                        /* 40 1K datagrams */
                   1174:
                   1175: /*ARGSUSED*/
1.7       mycroft  1176: int
1.119     matt     1177: udp_usrreq(struct socket *so, int req, struct mbuf *m, struct mbuf *nam,
1.145   ! christos 1178:        struct mbuf *control, struct lwp *l)
1.1       cgd      1179: {
1.66      augustss 1180:        struct inpcb *inp;
1.145   ! christos 1181:        struct proc *p;
1.1       cgd      1182:        int s;
1.66      augustss 1183:        int error = 0;
1.1       cgd      1184:
1.145   ! christos 1185:        p = l ? l->l_proc : NULL;
1.1       cgd      1186:        if (req == PRU_CONTROL)
1.31      mycroft  1187:                return (in_control(so, (long)m, (caddr_t)nam,
1.30      mycroft  1188:                    (struct ifnet *)control, p));
1.59      thorpej  1189:
1.60      thorpej  1190:        if (req == PRU_PURGEIF) {
1.80      itojun   1191:                in_pcbpurgeif0(&udbtable, (struct ifnet *)control);
1.60      thorpej  1192:                in_purgeif((struct ifnet *)control);
                   1193:                in_pcbpurgeif(&udbtable, (struct ifnet *)control);
1.59      thorpej  1194:                return (0);
                   1195:        }
1.31      mycroft  1196:
                   1197:        s = splsoftnet();
                   1198:        inp = sotoinpcb(so);
1.32      mycroft  1199: #ifdef DIAGNOSTIC
                   1200:        if (req != PRU_SEND && req != PRU_SENDOOB && control)
                   1201:                panic("udp_usrreq: unexpected control mbuf");
                   1202: #endif
1.31      mycroft  1203:        if (inp == 0 && req != PRU_ATTACH) {
                   1204:                error = EINVAL;
                   1205:                goto release;
                   1206:        }
                   1207:
1.1       cgd      1208:        /*
                   1209:         * Note: need to block udp_input while changing
                   1210:         * the udp pcb queue and/or pcb addresses.
                   1211:         */
                   1212:        switch (req) {
                   1213:
                   1214:        case PRU_ATTACH:
1.31      mycroft  1215:                if (inp != 0) {
                   1216:                        error = EISCONN;
1.1       cgd      1217:                        break;
                   1218:                }
1.98      matt     1219: #ifdef MBUFTRACE
                   1220:                so->so_mowner = &udp_mowner;
                   1221:                so->so_rcv.sb_mowner = &udp_rx_mowner;
                   1222:                so->so_snd.sb_mowner = &udp_tx_mowner;
                   1223: #endif
1.31      mycroft  1224:                if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
                   1225:                        error = soreserve(so, udp_sendspace, udp_recvspace);
                   1226:                        if (error)
                   1227:                                break;
                   1228:                }
1.18      mycroft  1229:                error = in_pcballoc(so, &udbtable);
1.1       cgd      1230:                if (error)
                   1231:                        break;
1.31      mycroft  1232:                inp = sotoinpcb(so);
                   1233:                inp->inp_ip.ip_ttl = ip_defttl;
1.1       cgd      1234:                break;
                   1235:
                   1236:        case PRU_DETACH:
1.31      mycroft  1237:                in_pcbdetach(inp);
1.1       cgd      1238:                break;
                   1239:
                   1240:        case PRU_BIND:
1.31      mycroft  1241:                error = in_pcbbind(inp, nam, p);
1.1       cgd      1242:                break;
                   1243:
                   1244:        case PRU_LISTEN:
                   1245:                error = EOPNOTSUPP;
                   1246:                break;
                   1247:
                   1248:        case PRU_CONNECT:
1.143     dsl      1249:                error = in_pcbconnect(inp, nam, p);
1.31      mycroft  1250:                if (error)
1.1       cgd      1251:                        break;
1.31      mycroft  1252:                soisconnected(so);
1.1       cgd      1253:                break;
                   1254:
                   1255:        case PRU_CONNECT2:
                   1256:                error = EOPNOTSUPP;
                   1257:                break;
                   1258:
                   1259:        case PRU_DISCONNECT:
1.31      mycroft  1260:                /*soisdisconnected(so);*/
                   1261:                so->so_state &= ~SS_ISCONNECTED;        /* XXX */
1.1       cgd      1262:                in_pcbdisconnect(inp);
1.34      mycroft  1263:                inp->inp_laddr = zeroin_addr;           /* XXX */
1.35      mycroft  1264:                in_pcbstate(inp, INP_BOUND);            /* XXX */
1.1       cgd      1265:                break;
                   1266:
                   1267:        case PRU_SHUTDOWN:
                   1268:                socantsendmore(so);
                   1269:                break;
                   1270:
1.31      mycroft  1271:        case PRU_RCVD:
                   1272:                error = EOPNOTSUPP;
1.1       cgd      1273:                break;
                   1274:
1.31      mycroft  1275:        case PRU_SEND:
1.32      mycroft  1276:                if (control && control->m_len) {
                   1277:                        m_freem(control);
                   1278:                        m_freem(m);
                   1279:                        error = EINVAL;
                   1280:                        break;
                   1281:                }
1.31      mycroft  1282:        {
1.35      mycroft  1283:                struct in_addr laddr;                   /* XXX */
1.1       cgd      1284:
1.31      mycroft  1285:                if (nam) {
1.35      mycroft  1286:                        laddr = inp->inp_laddr;         /* XXX */
1.31      mycroft  1287:                        if ((so->so_state & SS_ISCONNECTED) != 0) {
                   1288:                                error = EISCONN;
1.32      mycroft  1289:                                goto die;
1.31      mycroft  1290:                        }
1.143     dsl      1291:                        error = in_pcbconnect(inp, nam, p);
1.100     matt     1292:                        if (error)
                   1293:                                goto die;
1.31      mycroft  1294:                } else {
                   1295:                        if ((so->so_state & SS_ISCONNECTED) == 0) {
                   1296:                                error = ENOTCONN;
1.32      mycroft  1297:                                goto die;
1.31      mycroft  1298:                        }
                   1299:                }
1.33      mycroft  1300:                error = udp_output(m, inp);
1.100     matt     1301:                m = NULL;
1.31      mycroft  1302:                if (nam) {
                   1303:                        in_pcbdisconnect(inp);
1.35      mycroft  1304:                        inp->inp_laddr = laddr;         /* XXX */
                   1305:                        in_pcbstate(inp, INP_BOUND);    /* XXX */
1.31      mycroft  1306:                }
1.100     matt     1307:          die:
                   1308:                if (m)
                   1309:                        m_freem(m);
1.31      mycroft  1310:        }
1.1       cgd      1311:                break;
                   1312:
                   1313:        case PRU_SENSE:
                   1314:                /*
                   1315:                 * stat: don't bother with a blocksize.
                   1316:                 */
1.31      mycroft  1317:                splx(s);
1.1       cgd      1318:                return (0);
                   1319:
1.31      mycroft  1320:        case PRU_RCVOOB:
                   1321:                error =  EOPNOTSUPP;
                   1322:                break;
                   1323:
1.1       cgd      1324:        case PRU_SENDOOB:
1.32      mycroft  1325:                m_freem(control);
1.31      mycroft  1326:                m_freem(m);
1.1       cgd      1327:                error =  EOPNOTSUPP;
                   1328:                break;
                   1329:
1.31      mycroft  1330:        case PRU_SOCKADDR:
                   1331:                in_setsockaddr(inp, nam);
                   1332:                break;
                   1333:
                   1334:        case PRU_PEERADDR:
                   1335:                in_setpeeraddr(inp, nam);
                   1336:                break;
1.1       cgd      1337:
                   1338:        default:
                   1339:                panic("udp_usrreq");
                   1340:        }
                   1341:
                   1342: release:
1.31      mycroft  1343:        splx(s);
1.1       cgd      1344:        return (error);
1.13      mycroft  1345: }
                   1346:
                   1347: /*
                   1348:  * Sysctl for udp variables.
                   1349:  */
1.114     atatat   1350: SYSCTL_SETUP(sysctl_net_inet_udp_setup, "sysctl net.inet.udp subtree setup")
1.13      mycroft  1351: {
1.114     atatat   1352:
1.116     atatat   1353:        sysctl_createv(clog, 0, NULL, NULL,
                   1354:                       CTLFLAG_PERMANENT,
1.114     atatat   1355:                       CTLTYPE_NODE, "net", NULL,
                   1356:                       NULL, 0, NULL, 0,
                   1357:                       CTL_NET, CTL_EOL);
1.116     atatat   1358:        sysctl_createv(clog, 0, NULL, NULL,
                   1359:                       CTLFLAG_PERMANENT,
1.114     atatat   1360:                       CTLTYPE_NODE, "inet", NULL,
                   1361:                       NULL, 0, NULL, 0,
                   1362:                       CTL_NET, PF_INET, CTL_EOL);
1.116     atatat   1363:        sysctl_createv(clog, 0, NULL, NULL,
                   1364:                       CTLFLAG_PERMANENT,
1.122     atatat   1365:                       CTLTYPE_NODE, "udp",
                   1366:                       SYSCTL_DESCR("UDPv4 related settings"),
1.114     atatat   1367:                       NULL, 0, NULL, 0,
                   1368:                       CTL_NET, PF_INET, IPPROTO_UDP, CTL_EOL);
                   1369:
1.116     atatat   1370:        sysctl_createv(clog, 0, NULL, NULL,
                   1371:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.122     atatat   1372:                       CTLTYPE_INT, "checksum",
1.123     heas     1373:                       SYSCTL_DESCR("Compute UDP checksums"),
1.114     atatat   1374:                       NULL, 0, &udpcksum, 0,
                   1375:                       CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_CHECKSUM,
                   1376:                       CTL_EOL);
1.116     atatat   1377:        sysctl_createv(clog, 0, NULL, NULL,
                   1378:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.122     atatat   1379:                       CTLTYPE_INT, "sendspace",
                   1380:                       SYSCTL_DESCR("Default UDP send buffer size"),
1.114     atatat   1381:                       NULL, 0, &udp_sendspace, 0,
                   1382:                       CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_SENDSPACE,
                   1383:                       CTL_EOL);
1.116     atatat   1384:        sysctl_createv(clog, 0, NULL, NULL,
                   1385:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.122     atatat   1386:                       CTLTYPE_INT, "recvspace",
                   1387:                       SYSCTL_DESCR("Default UDP receive buffer size"),
1.114     atatat   1388:                       NULL, 0, &udp_recvspace, 0,
                   1389:                       CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_RECVSPACE,
                   1390:                       CTL_EOL);
1.125     thorpej  1391:        sysctl_createv(clog, 0, NULL, NULL,
                   1392:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1393:                       CTLTYPE_INT, "do_loopback_cksum",
                   1394:                       SYSCTL_DESCR("Perform UDP checksum on loopback"),
                   1395:                       NULL, 0, &udp_do_loopback_cksum, 0,
                   1396:                       CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_LOOPBACKCKSUM,
                   1397:                       CTL_EOL);
1.132     atatat   1398:        sysctl_createv(clog, 0, NULL, NULL,
                   1399:                       CTLFLAG_PERMANENT,
1.134     atatat   1400:                       CTLTYPE_STRUCT, "pcblist",
1.132     atatat   1401:                       SYSCTL_DESCR("UDP protocol control block list"),
                   1402:                       sysctl_inpcblist, 0, &udbtable, 0,
                   1403:                       CTL_NET, PF_INET, IPPROTO_UDP, CTL_CREATE,
                   1404:                       CTL_EOL);
1.139     elad     1405:        sysctl_createv(clog, 0, NULL, NULL,
                   1406:                       CTLFLAG_PERMANENT,
                   1407:                       CTLTYPE_STRUCT, "stats",
                   1408:                       SYSCTL_DESCR("UDP statistics"),
                   1409:                       NULL, 0, &udpstat, sizeof(udpstat),
                   1410:                       CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_STATS,
                   1411:                       CTL_EOL);
1.1       cgd      1412: }
1.72      itojun   1413: #endif
1.130     manu     1414:
                   1415: #if (defined INET && defined IPSEC_NAT_T)
                   1416: /*
                   1417:  * Returns:
                   1418:  * 1 if the packet was processed
                   1419:  * 0 if normal UDP processing should take place
1.144     manu     1420:  * -1 if an error occurent and m was freed
1.130     manu     1421:  */
                   1422: static int
1.144     manu     1423: udp4_espinudp(mp, off, src, so)
                   1424:        struct mbuf **mp;
1.130     manu     1425:        int off;
                   1426:        struct sockaddr *src;
                   1427:        struct socket *so;
                   1428: {
                   1429:        size_t len;
                   1430:        caddr_t data;
                   1431:        struct inpcb *inp;
                   1432:        size_t skip = 0;
                   1433:        size_t minlen;
                   1434:        size_t iphdrlen;
                   1435:        struct ip *ip;
                   1436:        struct mbuf *n;
1.136     manu     1437:        struct m_tag *tag;
                   1438:        struct udphdr *udphdr;
                   1439:        u_int16_t sport, dport;
1.144     manu     1440:        struct mbuf *m = *mp;
1.130     manu     1441:
1.131     perry    1442:        /*
1.130     manu     1443:         * Collapse the mbuf chain if the first mbuf is too short
                   1444:         * The longest case is: UDP + non ESP marker + ESP
                   1445:         */
                   1446:        minlen = off + sizeof(u_int64_t) + sizeof(struct esp);
                   1447:        if (minlen > m->m_pkthdr.len)
                   1448:                minlen = m->m_pkthdr.len;
                   1449:
                   1450:        if (m->m_len < minlen) {
1.144     manu     1451:                if ((*mp = m_pullup(m, minlen)) == NULL) {
1.130     manu     1452:                        printf("udp4_espinudp: m_pullup failed\n");
1.144     manu     1453:                        return -1;
1.130     manu     1454:                }
1.144     manu     1455:                m = *mp;
1.130     manu     1456:        }
                   1457:
1.131     perry    1458:        len = m->m_len - off;
1.130     manu     1459:        data = mtod(m, caddr_t) + off;
                   1460:        inp = sotoinpcb(so);
                   1461:
                   1462:        /* Ignore keepalive packets */
                   1463:        if ((len == 1) && (data[0] == '\xff')) {
                   1464:                return 1;
                   1465:        }
                   1466:
1.131     perry    1467:        /*
                   1468:         * Check that the payload is long enough to hold
1.130     manu     1469:         * an ESP header and compute the length of encapsulation
1.131     perry    1470:         * header to remove
1.130     manu     1471:         */
                   1472:        if (inp->inp_flags & INP_ESPINUDP) {
                   1473:                u_int32_t *st = (u_int32_t *)data;
                   1474:
                   1475:                if ((len <= sizeof(struct esp)) || (*st == 0))
                   1476:                        return 0; /* Normal UDP processing */
                   1477:
                   1478:                skip = sizeof(struct udphdr);
                   1479:        }
                   1480:
                   1481:        if (inp->inp_flags & INP_ESPINUDP_NON_IKE) {
1.142     kleink   1482:                u_int32_t *st = (u_int32_t *)data;
1.130     manu     1483:
                   1484:                if ((len <= sizeof(u_int64_t) + sizeof(struct esp))
1.142     kleink   1485:                    || ((st[0] | st[1]) != 0))
1.130     manu     1486:                        return 0; /* Normal UDP processing */
1.131     perry    1487:
1.130     manu     1488:                skip = sizeof(struct udphdr) + sizeof(u_int64_t);
                   1489:        }
                   1490:
                   1491:        /*
1.136     manu     1492:         * Get the UDP ports. They are handled in network
                   1493:         * order everywhere in IPSEC_NAT_T code.
                   1494:         */
                   1495:        udphdr = (struct udphdr *)(data - skip);
                   1496:        sport = udphdr->uh_sport;
                   1497:        dport = udphdr->uh_dport;
                   1498:
                   1499:        /*
1.130     manu     1500:         * Remove the UDP header (and possibly the non ESP marker)
                   1501:         * IP header lendth is iphdrlen
1.131     perry    1502:         * Before:
1.130     manu     1503:         *   <--- off --->
                   1504:         *   +----+------+-----+
                   1505:         *   | IP |  UDP | ESP |
                   1506:         *   +----+------+-----+
                   1507:         *        <-skip->
                   1508:         * After:
                   1509:         *          +----+-----+
                   1510:         *          | IP | ESP |
                   1511:         *          +----+-----+
                   1512:         *   <-skip->
                   1513:         */
                   1514:        iphdrlen = off - sizeof(struct udphdr);
                   1515:        memmove(mtod(m, caddr_t) + skip, mtod(m, caddr_t), iphdrlen);
                   1516:        m_adj(m, skip);
                   1517:
                   1518:        ip = mtod(m, struct ip *);
                   1519:        ip->ip_len = htons(ntohs(ip->ip_len) - skip);
                   1520:        ip->ip_p = IPPROTO_ESP;
                   1521:
                   1522:        /*
1.131     perry    1523:         * Copy the mbuf to avoid multiple free, as both
                   1524:         * esp4_input (which we call) and udp_input (which
1.130     manu     1525:         * called us) free the mbuf.
                   1526:         */
                   1527:        if ((n = m_dup(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
                   1528:                printf("udp4_espinudp: m_dup failed\n");
                   1529:                return 0;
                   1530:        }
                   1531:
1.136     manu     1532:        /*
                   1533:         * Add a PACKET_TAG_IPSEC_NAT_T_PORT tag to remember
                   1534:         * the source UDP port. This is required if we want
                   1535:         * to select the right SPD for multiple hosts behind
                   1536:         * same NAT
                   1537:         */
1.137     manu     1538:        if ((tag = m_tag_get(PACKET_TAG_IPSEC_NAT_T_PORTS,
                   1539:            sizeof(sport) + sizeof(dport), M_DONTWAIT)) == NULL) {
                   1540:                printf("udp4_espinudp: m_tag_get failed\n");
1.138     manu     1541:                m_freem(n);
1.137     manu     1542:                return 0;
                   1543:        }
1.136     manu     1544:        ((u_int16_t *)(tag + 1))[0] = sport;
                   1545:        ((u_int16_t *)(tag + 1))[1] = dport;
                   1546:        m_tag_prepend(n, tag);
                   1547:
1.130     manu     1548:        esp4_input(n, iphdrlen);
                   1549:
                   1550:        /* We handled it, it shoudln't be handled by UDP */
                   1551:        return 1;
                   1552: }
                   1553: #endif

CVSweb <webmaster@jp.NetBSD.org>