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Annotation of src/sys/netinet/udp_usrreq.c, Revision 1.189

1.189   ! christos    1: /*     $NetBSD: udp_usrreq.c,v 1.188 2013/06/04 22:47:37 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>
1.189   ! christos   64: __KERNEL_RCSID(0, "$NetBSD: udp_usrreq.c,v 1.188 2013/06/04 22:47:37 christos Exp $");
1.50      thorpej    65:
1.77      soda       66: #include "opt_inet.h"
1.174     christos   67: #include "opt_compat_netbsd.h"
1.50      thorpej    68: #include "opt_ipsec.h"
1.78      thorpej    69: #include "opt_inet_csum.h"
1.64      ws         70: #include "opt_ipkdb.h"
1.101     martin     71: #include "opt_mbuftrace.h"
1.1       cgd        72:
1.5       mycroft    73: #include <sys/param.h>
                     74: #include <sys/malloc.h>
                     75: #include <sys/mbuf.h>
                     76: #include <sys/protosw.h>
                     77: #include <sys/socket.h>
                     78: #include <sys/socketvar.h>
1.13      mycroft    79: #include <sys/errno.h>
1.5       mycroft    80: #include <sys/stat.h>
1.27      christos   81: #include <sys/systm.h>
                     82: #include <sys/proc.h>
1.53      itojun     83: #include <sys/domain.h>
1.27      christos   84: #include <sys/sysctl.h>
1.1       cgd        85:
1.5       mycroft    86: #include <net/if.h>
                     87: #include <net/route.h>
1.1       cgd        88:
1.5       mycroft    89: #include <netinet/in.h>
                     90: #include <netinet/in_systm.h>
1.15      cgd        91: #include <netinet/in_var.h>
1.5       mycroft    92: #include <netinet/ip.h>
                     93: #include <netinet/in_pcb.h>
                     94: #include <netinet/ip_var.h>
                     95: #include <netinet/ip_icmp.h>
                     96: #include <netinet/udp.h>
                     97: #include <netinet/udp_var.h>
1.166     thorpej    98: #include <netinet/udp_private.h>
1.1       cgd        99:
1.53      itojun    100: #ifdef INET6
                    101: #include <netinet/ip6.h>
                    102: #include <netinet/icmp6.h>
                    103: #include <netinet6/ip6_var.h>
1.167     thorpej   104: #include <netinet6/ip6_private.h>
1.53      itojun    105: #include <netinet6/in6_pcb.h>
                    106: #include <netinet6/udp6_var.h>
1.168     thorpej   107: #include <netinet6/udp6_private.h>
1.146     rpaulo    108: #include <netinet6/scope6_var.h>
1.53      itojun    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:
1.105     jonathan  121: #ifdef FAST_IPSEC
                    122: #include <netipsec/ipsec.h>
1.169     thorpej   123: #include <netipsec/ipsec_var.h>
                    124: #include <netipsec/ipsec_private.h>
1.147     christos  125: #include <netipsec/esp.h>
1.105     jonathan  126: #ifdef INET6
                    127: #include <netipsec/ipsec6.h>
                    128: #endif
1.169     thorpej   129: #endif /* FAST_IPSEC */
1.105     jonathan  130:
1.174     christos  131: #ifdef COMPAT_50
                    132: #include <compat/sys/socket.h>
                    133: #endif
                    134:
1.64      ws        135: #ifdef IPKDB
                    136: #include <ipkdb/ipkdb.h>
                    137: #endif
                    138:
1.8       mycroft   139: /*
                    140:  * UDP protocol implementation.
                    141:  * Per RFC 768, August, 1980.
                    142:  */
                    143: int    udpcksum = 1;
1.141     yamt      144: int    udp_do_loopback_cksum = 0;
1.93      matt      145:
                    146: struct inpcbtable udbtable;
1.164     thorpej   147:
1.166     thorpej   148: percpu_t *udpstat_percpu;
1.8       mycroft   149:
1.72      itojun    150: #ifdef INET
1.189   ! christos  151: #ifdef FAST_IPSEC
1.144     manu      152: static int udp4_espinudp (struct mbuf **, int, struct sockaddr *,
1.130     manu      153:        struct socket *);
1.189   ! christos  154: #endif
1.119     matt      155: static void udp4_sendup (struct mbuf *, int, struct sockaddr *,
                    156:        struct socket *);
                    157: static int udp4_realinput (struct sockaddr_in *, struct sockaddr_in *,
1.144     manu      158:        struct mbuf **, int);
1.129     yamt      159: static int udp4_input_checksum(struct mbuf *, const struct udphdr *, int, int);
1.72      itojun    160: #endif
1.53      itojun    161: #ifdef INET6
1.119     matt      162: static void udp6_sendup (struct mbuf *, int, struct sockaddr *,
                    163:        struct socket *);
                    164: static int udp6_realinput (int, struct sockaddr_in6 *,
                    165:        struct sockaddr_in6 *, struct mbuf *, int);
1.129     yamt      166: static int udp6_input_checksum(struct mbuf *, const struct udphdr *, int, int);
1.53      itojun    167: #endif
1.72      itojun    168: #ifdef INET
1.119     matt      169: static void udp_notify (struct inpcb *, int);
1.72      itojun    170: #endif
1.7       mycroft   171:
1.26      mycroft   172: #ifndef UDBHASHSIZE
                    173: #define        UDBHASHSIZE     128
                    174: #endif
                    175: int    udbhashsize = UDBHASHSIZE;
                    176:
1.98      matt      177: #ifdef MBUFTRACE
1.150     dogcow    178: struct mowner udp_mowner = MOWNER_INIT("udp", "");
                    179: struct mowner udp_rx_mowner = MOWNER_INIT("udp", "rx");
                    180: struct mowner udp_tx_mowner = MOWNER_INIT("udp", "tx");
1.98      matt      181: #endif
                    182:
1.78      thorpej   183: #ifdef UDP_CSUM_COUNTERS
                    184: #include <sys/device.h>
                    185:
1.140     yamt      186: #if defined(INET)
1.78      thorpej   187: struct evcnt udp_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    188:     NULL, "udp", "hwcsum bad");
                    189: struct evcnt udp_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    190:     NULL, "udp", "hwcsum ok");
                    191: struct evcnt udp_hwcsum_data = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    192:     NULL, "udp", "hwcsum data");
                    193: struct evcnt udp_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    194:     NULL, "udp", "swcsum");
                    195:
1.120     matt      196: EVCNT_ATTACH_STATIC(udp_hwcsum_bad);
                    197: EVCNT_ATTACH_STATIC(udp_hwcsum_ok);
                    198: EVCNT_ATTACH_STATIC(udp_hwcsum_data);
                    199: EVCNT_ATTACH_STATIC(udp_swcsum);
1.140     yamt      200: #endif /* defined(INET) */
                    201:
                    202: #if defined(INET6)
                    203: struct evcnt udp6_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    204:     NULL, "udp6", "hwcsum bad");
                    205: struct evcnt udp6_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    206:     NULL, "udp6", "hwcsum ok");
                    207: struct evcnt udp6_hwcsum_data = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    208:     NULL, "udp6", "hwcsum data");
                    209: struct evcnt udp6_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    210:     NULL, "udp6", "swcsum");
                    211:
                    212: EVCNT_ATTACH_STATIC(udp6_hwcsum_bad);
                    213: EVCNT_ATTACH_STATIC(udp6_hwcsum_ok);
                    214: EVCNT_ATTACH_STATIC(udp6_hwcsum_data);
                    215: EVCNT_ATTACH_STATIC(udp6_swcsum);
                    216: #endif /* defined(INET6) */
                    217:
                    218: #define        UDP_CSUM_COUNTER_INCR(ev)       (ev)->ev_count++
1.120     matt      219:
1.78      thorpej   220: #else
                    221:
                    222: #define        UDP_CSUM_COUNTER_INCR(ev)       /* nothing */
                    223:
                    224: #endif /* UDP_CSUM_COUNTERS */
                    225:
1.179     pooka     226: static void sysctl_net_inet_udp_setup(struct sysctllog **);
                    227:
1.7       mycroft   228: void
1.119     matt      229: udp_init(void)
1.1       cgd       230: {
1.18      mycroft   231:
1.179     pooka     232:        sysctl_net_inet_udp_setup(NULL);
                    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);
1.166     thorpej   239:
1.171     yamt      240: #ifdef INET
1.166     thorpej   241:        udpstat_percpu = percpu_alloc(sizeof(uint64_t) * UDP_NSTATS);
1.171     yamt      242: #endif
                    243: #ifdef INET6
                    244:        udp6stat_percpu = percpu_alloc(sizeof(uint64_t) * UDP6_NSTATS);
                    245: #endif
1.1       cgd       246: }
                    247:
1.129     yamt      248: /*
                    249:  * Checksum extended UDP header and data.
                    250:  */
                    251:
                    252: int
                    253: udp_input_checksum(int af, struct mbuf *m, const struct udphdr *uh,
                    254:     int iphlen, int len)
                    255: {
                    256:
                    257:        switch (af) {
1.72      itojun    258: #ifdef INET
1.129     yamt      259:        case AF_INET:
                    260:                return udp4_input_checksum(m, uh, iphlen, len);
                    261: #endif
                    262: #ifdef INET6
                    263:        case AF_INET6:
                    264:                return udp6_input_checksum(m, uh, iphlen, len);
                    265: #endif
                    266:        }
                    267: #ifdef DIAGNOSTIC
                    268:        panic("udp_input_checksum: unknown af %d", af);
                    269: #endif
                    270:        /* NOTREACHED */
                    271:        return -1;
                    272: }
                    273:
                    274: #ifdef INET
                    275:
                    276: /*
                    277:  * Checksum extended UDP header and data.
                    278:  */
                    279:
                    280: static int
                    281: udp4_input_checksum(struct mbuf *m, const struct udphdr *uh,
                    282:     int iphlen, int len)
                    283: {
                    284:
                    285:        /*
                    286:         * XXX it's better to record and check if this mbuf is
                    287:         * already checked.
                    288:         */
                    289:
                    290:        if (uh->uh_sum == 0)
                    291:                return 0;
                    292:
                    293:        switch (m->m_pkthdr.csum_flags &
                    294:            ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_UDPv4) |
                    295:            M_CSUM_TCP_UDP_BAD | M_CSUM_DATA)) {
                    296:        case M_CSUM_UDPv4|M_CSUM_TCP_UDP_BAD:
                    297:                UDP_CSUM_COUNTER_INCR(&udp_hwcsum_bad);
                    298:                goto badcsum;
                    299:
                    300:        case M_CSUM_UDPv4|M_CSUM_DATA: {
                    301:                u_int32_t hw_csum = m->m_pkthdr.csum_data;
                    302:
                    303:                UDP_CSUM_COUNTER_INCR(&udp_hwcsum_data);
                    304:                if (m->m_pkthdr.csum_flags & M_CSUM_NO_PSEUDOHDR) {
                    305:                        const struct ip *ip =
                    306:                            mtod(m, const struct ip *);
                    307:
                    308:                        hw_csum = in_cksum_phdr(ip->ip_src.s_addr,
                    309:                            ip->ip_dst.s_addr,
                    310:                            htons(hw_csum + len + IPPROTO_UDP));
                    311:                }
                    312:                if ((hw_csum ^ 0xffff) != 0)
                    313:                        goto badcsum;
                    314:                break;
                    315:        }
                    316:
                    317:        case M_CSUM_UDPv4:
                    318:                /* Checksum was okay. */
                    319:                UDP_CSUM_COUNTER_INCR(&udp_hwcsum_ok);
                    320:                break;
                    321:
                    322:        default:
                    323:                /*
                    324:                 * Need to compute it ourselves.  Maybe skip checksum
                    325:                 * on loopback interfaces.
                    326:                 */
                    327:                if (__predict_true(!(m->m_pkthdr.rcvif->if_flags &
                    328:                                     IFF_LOOPBACK) ||
                    329:                                   udp_do_loopback_cksum)) {
                    330:                        UDP_CSUM_COUNTER_INCR(&udp_swcsum);
                    331:                        if (in4_cksum(m, IPPROTO_UDP, iphlen, len) != 0)
                    332:                                goto badcsum;
                    333:                }
                    334:                break;
                    335:        }
                    336:
                    337:        return 0;
                    338:
                    339: badcsum:
1.166     thorpej   340:        UDP_STATINC(UDP_STAT_BADSUM);
1.129     yamt      341:        return -1;
                    342: }
                    343:
1.7       mycroft   344: void
1.27      christos  345: udp_input(struct mbuf *m, ...)
1.1       cgd       346: {
1.53      itojun    347:        va_list ap;
                    348:        struct sockaddr_in src, dst;
                    349:        struct ip *ip;
                    350:        struct udphdr *uh;
1.97      simonb    351:        int iphlen;
1.53      itojun    352:        int len;
                    353:        int n;
1.96      itojun    354:        u_int16_t ip_len;
1.53      itojun    355:
                    356:        va_start(ap, m);
                    357:        iphlen = va_arg(ap, int);
1.97      simonb    358:        (void)va_arg(ap, int);          /* ignore value, advance ap */
1.53      itojun    359:        va_end(ap);
                    360:
1.98      matt      361:        MCLAIM(m, &udp_rx_mowner);
1.166     thorpej   362:        UDP_STATINC(UDP_STAT_IPACKETS);
1.53      itojun    363:
                    364:        /*
                    365:         * Get IP and UDP header together in first mbuf.
                    366:         */
                    367:        ip = mtod(m, struct ip *);
                    368:        IP6_EXTHDR_GET(uh, struct udphdr *, m, iphlen, sizeof(struct udphdr));
                    369:        if (uh == NULL) {
1.166     thorpej   370:                UDP_STATINC(UDP_STAT_HDROPS);
1.53      itojun    371:                return;
                    372:        }
1.95      thorpej   373:        KASSERT(UDP_HDR_ALIGNED_P(uh));
1.53      itojun    374:
1.57      itojun    375:        /* destination port of 0 is illegal, based on RFC768. */
                    376:        if (uh->uh_dport == 0)
                    377:                goto bad;
                    378:
1.53      itojun    379:        /*
                    380:         * Make mbuf data length reflect UDP length.
                    381:         * If not enough data to reflect UDP length, drop.
                    382:         */
1.96      itojun    383:        ip_len = ntohs(ip->ip_len);
1.53      itojun    384:        len = ntohs((u_int16_t)uh->uh_ulen);
1.96      itojun    385:        if (ip_len != iphlen + len) {
                    386:                if (ip_len < iphlen + len || len < sizeof(struct udphdr)) {
1.166     thorpej   387:                        UDP_STATINC(UDP_STAT_BADLEN);
1.53      itojun    388:                        goto bad;
                    389:                }
1.96      itojun    390:                m_adj(m, iphlen + len - ip_len);
1.53      itojun    391:        }
                    392:
                    393:        /*
                    394:         * Checksum extended UDP header and data.
                    395:         */
1.129     yamt      396:        if (udp4_input_checksum(m, uh, iphlen, len))
                    397:                goto badcsum;
1.53      itojun    398:
                    399:        /* construct source and dst sockaddrs. */
1.159     dyoung    400:        sockaddr_in_init(&src, &ip->ip_src, uh->uh_sport);
                    401:        sockaddr_in_init(&dst, &ip->ip_dst, uh->uh_dport);
1.53      itojun    402:
1.144     manu      403:        if ((n = udp4_realinput(&src, &dst, &m, iphlen)) == -1) {
1.166     thorpej   404:                UDP_STATINC(UDP_STAT_HDROPS);
1.144     manu      405:                return;
                    406:        }
1.188     christos  407:        if (m == NULL) {
                    408:                /*
                    409:                 * packet has been processed by ESP stuff -
                    410:                 * e.g. dropped NAT-T-keep-alive-packet ...
                    411:                 */
                    412:                return;
                    413:        }
                    414:        ip = mtod(m, struct ip *);
1.53      itojun    415: #ifdef INET6
                    416:        if (IN_MULTICAST(ip->ip_dst.s_addr) || n == 0) {
                    417:                struct sockaddr_in6 src6, dst6;
                    418:
1.175     cegger    419:                memset(&src6, 0, sizeof(src6));
1.53      itojun    420:                src6.sin6_family = AF_INET6;
                    421:                src6.sin6_len = sizeof(struct sockaddr_in6);
                    422:                src6.sin6_addr.s6_addr[10] = src6.sin6_addr.s6_addr[11] = 0xff;
1.177     tsutsui   423:                memcpy(&src6.sin6_addr.s6_addr[12], &ip->ip_src,
1.53      itojun    424:                        sizeof(ip->ip_src));
                    425:                src6.sin6_port = uh->uh_sport;
1.175     cegger    426:                memset(&dst6, 0, sizeof(dst6));
1.53      itojun    427:                dst6.sin6_family = AF_INET6;
                    428:                dst6.sin6_len = sizeof(struct sockaddr_in6);
                    429:                dst6.sin6_addr.s6_addr[10] = dst6.sin6_addr.s6_addr[11] = 0xff;
1.177     tsutsui   430:                memcpy(&dst6.sin6_addr.s6_addr[12], &ip->ip_dst,
1.53      itojun    431:                        sizeof(ip->ip_dst));
                    432:                dst6.sin6_port = uh->uh_dport;
                    433:
                    434:                n += udp6_realinput(AF_INET, &src6, &dst6, m, iphlen);
                    435:        }
                    436: #endif
                    437:
                    438:        if (n == 0) {
                    439:                if (m->m_flags & (M_BCAST | M_MCAST)) {
1.166     thorpej   440:                        UDP_STATINC(UDP_STAT_NOPORTBCAST);
1.53      itojun    441:                        goto bad;
                    442:                }
1.166     thorpej   443:                UDP_STATINC(UDP_STAT_NOPORT);
1.64      ws        444: #ifdef IPKDB
1.53      itojun    445:                if (checkipkdb(&ip->ip_src, uh->uh_sport, uh->uh_dport,
                    446:                                m, iphlen + sizeof(struct udphdr),
                    447:                                m->m_pkthdr.len - iphlen - sizeof(struct udphdr))) {
                    448:                        /*
                    449:                         * It was a debugger connect packet,
                    450:                         * just drop it now
                    451:                         */
                    452:                        goto bad;
                    453:                }
                    454: #endif
                    455:                icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0);
                    456:                m = NULL;
                    457:        }
                    458:
                    459: bad:
                    460:        if (m)
                    461:                m_freem(m);
1.78      thorpej   462:        return;
                    463:
                    464: badcsum:
                    465:        m_freem(m);
1.53      itojun    466: }
1.72      itojun    467: #endif
1.53      itojun    468:
                    469: #ifdef INET6
1.129     yamt      470: static int
                    471: udp6_input_checksum(struct mbuf *m, const struct udphdr *uh, int off, int len)
                    472: {
                    473:
1.140     yamt      474:        /*
                    475:         * XXX it's better to record and check if this mbuf is
                    476:         * already checked.
                    477:         */
                    478:
1.129     yamt      479:        if (__predict_false((m->m_flags & M_LOOP) && !udp_do_loopback_cksum)) {
                    480:                goto good;
                    481:        }
                    482:        if (uh->uh_sum == 0) {
1.168     thorpej   483:                UDP6_STATINC(UDP6_STAT_NOSUM);
1.129     yamt      484:                goto bad;
                    485:        }
1.140     yamt      486:
                    487:        switch (m->m_pkthdr.csum_flags &
                    488:            ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_UDPv6) |
                    489:            M_CSUM_TCP_UDP_BAD | M_CSUM_DATA)) {
                    490:        case M_CSUM_UDPv6|M_CSUM_TCP_UDP_BAD:
                    491:                UDP_CSUM_COUNTER_INCR(&udp6_hwcsum_bad);
1.168     thorpej   492:                UDP6_STATINC(UDP6_STAT_BADSUM);
1.129     yamt      493:                goto bad;
1.140     yamt      494:
                    495: #if 0 /* notyet */
                    496:        case M_CSUM_UDPv6|M_CSUM_DATA:
                    497: #endif
                    498:
                    499:        case M_CSUM_UDPv6:
                    500:                /* Checksum was okay. */
                    501:                UDP_CSUM_COUNTER_INCR(&udp6_hwcsum_ok);
                    502:                break;
                    503:
                    504:        default:
                    505:                /*
                    506:                 * Need to compute it ourselves.  Maybe skip checksum
                    507:                 * on loopback interfaces.
                    508:                 */
                    509:                UDP_CSUM_COUNTER_INCR(&udp6_swcsum);
                    510:                if (in6_cksum(m, IPPROTO_UDP, off, len) != 0) {
1.168     thorpej   511:                        UDP6_STATINC(UDP6_STAT_BADSUM);
1.140     yamt      512:                        goto bad;
                    513:                }
1.129     yamt      514:        }
                    515:
                    516: good:
                    517:        return 0;
                    518: bad:
                    519:        return -1;
                    520: }
                    521:
1.53      itojun    522: int
1.154     yamt      523: udp6_input(struct mbuf **mp, int *offp, int proto)
1.53      itojun    524: {
                    525:        struct mbuf *m = *mp;
                    526:        int off = *offp;
                    527:        struct sockaddr_in6 src, dst;
                    528:        struct ip6_hdr *ip6;
                    529:        struct udphdr *uh;
                    530:        u_int32_t plen, ulen;
                    531:
1.76      itojun    532:        ip6 = mtod(m, struct ip6_hdr *);
                    533:
1.53      itojun    534: #if defined(NFAITH) && 0 < NFAITH
1.76      itojun    535:        if (faithprefix(&ip6->ip6_dst)) {
                    536:                /* send icmp6 host unreach? */
                    537:                m_freem(m);
                    538:                return IPPROTO_DONE;
1.53      itojun    539:        }
                    540: #endif
                    541:
1.168     thorpej   542:        UDP6_STATINC(UDP6_STAT_IPACKETS);
1.53      itojun    543:
                    544:        /* check for jumbogram is done in ip6_input.  we can trust pkthdr.len */
                    545:        plen = m->m_pkthdr.len - off;
                    546:        IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(struct udphdr));
                    547:        if (uh == NULL) {
1.167     thorpej   548:                IP6_STATINC(IP6_STAT_TOOSHORT);
1.53      itojun    549:                return IPPROTO_DONE;
                    550:        }
1.95      thorpej   551:        KASSERT(UDP_HDR_ALIGNED_P(uh));
1.53      itojun    552:        ulen = ntohs((u_short)uh->uh_ulen);
1.69      itojun    553:        /*
                    554:         * RFC2675 section 4: jumbograms will have 0 in the UDP header field,
                    555:         * iff payload length > 0xffff.
                    556:         */
1.53      itojun    557:        if (ulen == 0 && plen > 0xffff)
                    558:                ulen = plen;
                    559:
                    560:        if (plen != ulen) {
1.168     thorpej   561:                UDP6_STATINC(UDP6_STAT_BADLEN);
1.54      itojun    562:                goto bad;
                    563:        }
                    564:
1.57      itojun    565:        /* destination port of 0 is illegal, based on RFC768. */
                    566:        if (uh->uh_dport == 0)
                    567:                goto bad;
                    568:
1.54      itojun    569:        /* Be proactive about malicious use of IPv4 mapped address */
                    570:        if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
                    571:            IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
                    572:                /* XXX stat */
1.53      itojun    573:                goto bad;
                    574:        }
                    575:
                    576:        /*
1.125     thorpej   577:         * Checksum extended UDP header and data.  Maybe skip checksum
                    578:         * on loopback interfaces.
1.53      itojun    579:         */
1.129     yamt      580:        if (udp6_input_checksum(m, uh, off, ulen))
                    581:                goto bad;
1.53      itojun    582:
                    583:        /*
                    584:         * Construct source and dst sockaddrs.
                    585:         */
1.175     cegger    586:        memset(&src, 0, sizeof(src));
1.53      itojun    587:        src.sin6_family = AF_INET6;
                    588:        src.sin6_len = sizeof(struct sockaddr_in6);
1.146     rpaulo    589:        src.sin6_addr = ip6->ip6_src;
1.53      itojun    590:        src.sin6_port = uh->uh_sport;
1.175     cegger    591:        memset(&dst, 0, sizeof(dst));
1.53      itojun    592:        dst.sin6_family = AF_INET6;
                    593:        dst.sin6_len = sizeof(struct sockaddr_in6);
1.146     rpaulo    594:        dst.sin6_addr = ip6->ip6_dst;
1.53      itojun    595:        dst.sin6_port = uh->uh_dport;
                    596:
                    597:        if (udp6_realinput(AF_INET6, &src, &dst, m, off) == 0) {
                    598:                if (m->m_flags & M_MCAST) {
1.168     thorpej   599:                        UDP6_STATINC(UDP6_STAT_NOPORTMCAST);
1.53      itojun    600:                        goto bad;
                    601:                }
1.168     thorpej   602:                UDP6_STATINC(UDP6_STAT_NOPORT);
1.53      itojun    603:                icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
                    604:                m = NULL;
                    605:        }
                    606:
                    607: bad:
                    608:        if (m)
                    609:                m_freem(m);
                    610:        return IPPROTO_DONE;
                    611: }
                    612: #endif
                    613:
1.72      itojun    614: #ifdef INET
1.53      itojun    615: static void
1.119     matt      616: udp4_sendup(struct mbuf *m, int off /* offset of data portion */,
                    617:        struct sockaddr *src, struct socket *so)
1.53      itojun    618: {
                    619:        struct mbuf *opts = NULL;
                    620:        struct mbuf *n;
                    621:        struct inpcb *inp = NULL;
                    622:
                    623:        if (!so)
                    624:                return;
                    625:        switch (so->so_proto->pr_domain->dom_family) {
                    626:        case AF_INET:
                    627:                inp = sotoinpcb(so);
                    628:                break;
                    629: #ifdef INET6
                    630:        case AF_INET6:
                    631:                break;
                    632: #endif
                    633:        default:
                    634:                return;
                    635:        }
                    636:
1.186     drochner  637: #if defined(FAST_IPSEC)
1.53      itojun    638:        /* check AH/ESP integrity. */
                    639:        if (so != NULL && ipsec4_in_reject_so(m, so)) {
1.169     thorpej   640:                IPSEC_STATINC(IPSEC_STAT_IN_POLVIO);
1.162     dyoung    641:                if ((n = m_copypacket(m, M_DONTWAIT)) != NULL)
1.110     itojun    642:                        icmp_error(n, ICMP_UNREACH, ICMP_UNREACH_ADMIN_PROHIBIT,
                    643:                            0, 0);
1.53      itojun    644:                return;
                    645:        }
                    646: #endif /*IPSEC*/
                    647:
1.162     dyoung    648:        if ((n = m_copypacket(m, M_DONTWAIT)) != NULL) {
1.53      itojun    649:                if (inp && (inp->inp_flags & INP_CONTROLOPTS
1.174     christos  650: #ifdef SO_OTIMESTAMP
                    651:                         || so->so_options & SO_OTIMESTAMP
                    652: #endif
1.53      itojun    653:                         || so->so_options & SO_TIMESTAMP)) {
                    654:                        struct ip *ip = mtod(n, struct ip *);
                    655:                        ip_savecontrol(inp, &opts, ip, n);
                    656:                }
                    657:
                    658:                m_adj(n, off);
                    659:                if (sbappendaddr(&so->so_rcv, src, n,
                    660:                                opts) == 0) {
                    661:                        m_freem(n);
                    662:                        if (opts)
                    663:                                m_freem(opts);
1.124     darrenr   664:                        so->so_rcv.sb_overflowed++;
1.166     thorpej   665:                        UDP_STATINC(UDP_STAT_FULLSOCK);
1.53      itojun    666:                } else
                    667:                        sorwakeup(so);
                    668:        }
                    669: }
1.72      itojun    670: #endif
1.53      itojun    671:
                    672: #ifdef INET6
                    673: static void
1.119     matt      674: udp6_sendup(struct mbuf *m, int off /* offset of data portion */,
                    675:        struct sockaddr *src, struct socket *so)
1.53      itojun    676: {
                    677:        struct mbuf *opts = NULL;
                    678:        struct mbuf *n;
                    679:        struct in6pcb *in6p = NULL;
                    680:
                    681:        if (!so)
                    682:                return;
                    683:        if (so->so_proto->pr_domain->dom_family != AF_INET6)
                    684:                return;
                    685:        in6p = sotoin6pcb(so);
                    686:
1.186     drochner  687: #if defined(FAST_IPSEC)
1.53      itojun    688:        /* check AH/ESP integrity. */
                    689:        if (so != NULL && ipsec6_in_reject_so(m, so)) {
1.169     thorpej   690:                IPSEC6_STATINC(IPSEC_STAT_IN_POLVIO);
1.162     dyoung    691:                if ((n = m_copypacket(m, M_DONTWAIT)) != NULL)
1.110     itojun    692:                        icmp6_error(n, ICMP6_DST_UNREACH,
                    693:                            ICMP6_DST_UNREACH_ADMIN, 0);
1.53      itojun    694:                return;
                    695:        }
                    696: #endif /*IPSEC*/
                    697:
1.162     dyoung    698:        if ((n = m_copypacket(m, M_DONTWAIT)) != NULL) {
1.53      itojun    699:                if (in6p && (in6p->in6p_flags & IN6P_CONTROLOPTS
1.174     christos  700: #ifdef SO_OTIMESTAMP
                    701:                    || in6p->in6p_socket->so_options & SO_OTIMESTAMP
                    702: #endif
                    703:                    || in6p->in6p_socket->so_options & SO_TIMESTAMP)) {
1.53      itojun    704:                        struct ip6_hdr *ip6 = mtod(n, struct ip6_hdr *);
                    705:                        ip6_savecontrol(in6p, &opts, ip6, n);
                    706:                }
                    707:
                    708:                m_adj(n, off);
                    709:                if (sbappendaddr(&so->so_rcv, src, n, opts) == 0) {
                    710:                        m_freem(n);
                    711:                        if (opts)
                    712:                                m_freem(opts);
1.124     darrenr   713:                        so->so_rcv.sb_overflowed++;
1.168     thorpej   714:                        UDP6_STATINC(UDP6_STAT_FULLSOCK);
1.53      itojun    715:                } else
                    716:                        sorwakeup(so);
                    717:        }
                    718: }
                    719: #endif
                    720:
1.72      itojun    721: #ifdef INET
1.53      itojun    722: static int
1.119     matt      723: udp4_realinput(struct sockaddr_in *src, struct sockaddr_in *dst,
1.144     manu      724:        struct mbuf **mp, int off /* offset of udphdr */)
1.53      itojun    725: {
                    726:        u_int16_t *sport, *dport;
                    727:        int rcvcnt;
                    728:        struct in_addr *src4, *dst4;
1.109     itojun    729:        struct inpcb_hdr *inph;
1.53      itojun    730:        struct inpcb *inp;
1.144     manu      731:        struct mbuf *m = *mp;
1.53      itojun    732:
                    733:        rcvcnt = 0;
                    734:        off += sizeof(struct udphdr);   /* now, offset of payload */
                    735:
                    736:        if (src->sin_family != AF_INET || dst->sin_family != AF_INET)
                    737:                goto bad;
                    738:
                    739:        src4 = &src->sin_addr;
                    740:        sport = &src->sin_port;
                    741:        dst4 = &dst->sin_addr;
                    742:        dport = &dst->sin_port;
                    743:
1.73      itojun    744:        if (IN_MULTICAST(dst4->s_addr) ||
1.53      itojun    745:            in_broadcast(*dst4, m->m_pkthdr.rcvif)) {
                    746:                /*
                    747:                 * Deliver a multicast or broadcast datagram to *all* sockets
                    748:                 * for which the local and remote addresses and ports match
                    749:                 * those of the incoming datagram.  This allows more than
                    750:                 * one process to receive multi/broadcasts on the same port.
                    751:                 * (This really ought to be done for unicast datagrams as
                    752:                 * well, but that would cause problems with existing
                    753:                 * applications that open both address-specific sockets and
                    754:                 * a wildcard socket listening to the same port -- they would
                    755:                 * end up receiving duplicates of every unicast datagram.
                    756:                 * Those applications open the multiple sockets to overcome an
                    757:                 * inadequacy of the UDP socket interface, but for backwards
                    758:                 * compatibility we avoid the problem here rather than
                    759:                 * fixing the interface.  Maybe 4.5BSD will remedy this?)
                    760:                 */
                    761:
                    762:                /*
1.92      itojun    763:                 * KAME note: traditionally we dropped udpiphdr from mbuf here.
1.71      itojun    764:                 * we need udpiphdr for IPsec processing so we do that later.
1.53      itojun    765:                 */
                    766:                /*
                    767:                 * Locate pcb(s) for datagram.
                    768:                 */
1.109     itojun    769:                CIRCLEQ_FOREACH(inph, &udbtable.inpt_queue, inph_queue) {
                    770:                        inp = (struct inpcb *)inph;
                    771:                        if (inp->inp_af != AF_INET)
                    772:                                continue;
                    773:
1.53      itojun    774:                        if (inp->inp_lport != *dport)
                    775:                                continue;
                    776:                        if (!in_nullhost(inp->inp_laddr)) {
                    777:                                if (!in_hosteq(inp->inp_laddr, *dst4))
                    778:                                        continue;
                    779:                        }
                    780:                        if (!in_nullhost(inp->inp_faddr)) {
                    781:                                if (!in_hosteq(inp->inp_faddr, *src4) ||
                    782:                                    inp->inp_fport != *sport)
                    783:                                        continue;
                    784:                        }
                    785:
                    786:                        udp4_sendup(m, off, (struct sockaddr *)src,
                    787:                                inp->inp_socket);
                    788:                        rcvcnt++;
                    789:
                    790:                        /*
                    791:                         * Don't look for additional matches if this one does
                    792:                         * not have either the SO_REUSEPORT or SO_REUSEADDR
                    793:                         * socket options set.  This heuristic avoids searching
                    794:                         * through all pcbs in the common case of a non-shared
                    795:                         * port.  It assumes that an application will never
                    796:                         * clear these options after setting them.
                    797:                         */
                    798:                        if ((inp->inp_socket->so_options &
                    799:                            (SO_REUSEPORT|SO_REUSEADDR)) == 0)
                    800:                                break;
                    801:                }
                    802:        } else {
                    803:                /*
                    804:                 * Locate pcb for datagram.
                    805:                 */
1.180     dyoung    806:                inp = in_pcblookup_connect(&udbtable, *src4, *sport, *dst4,
                    807:                    *dport, 0);
1.53      itojun    808:                if (inp == 0) {
1.166     thorpej   809:                        UDP_STATINC(UDP_STAT_PCBHASHMISS);
1.53      itojun    810:                        inp = in_pcblookup_bind(&udbtable, *dst4, *dport);
1.82      itojun    811:                        if (inp == 0)
1.53      itojun    812:                                return rcvcnt;
                    813:                }
                    814:
1.189   ! christos  815: #ifdef FAST_IPSEC
1.130     manu      816:                /* Handle ESP over UDP */
                    817:                if (inp->inp_flags & INP_ESPINUDP_ALL) {
                    818:                        struct sockaddr *sa = (struct sockaddr *)src;
                    819:
1.144     manu      820:                        switch(udp4_espinudp(mp, off, sa, inp->inp_socket)) {
                    821:                        case -1:        /* Error, m was freeed */
                    822:                                rcvcnt = -1;
                    823:                                goto bad;
                    824:                                break;
                    825:
                    826:                        case 1:         /* ESP over UDP */
1.130     manu      827:                                rcvcnt++;
                    828:                                goto bad;
1.144     manu      829:                                break;
                    830:
                    831:                        case 0:         /* plain UDP */
                    832:                        default:        /* Unexpected */
                    833:                                /*
                    834:                                 * Normal UDP processing will take place
                    835:                                 * m may have changed.
                    836:                                 */
                    837:                                m = *mp;
                    838:                                break;
1.130     manu      839:                        }
                    840:                }
1.189   ! christos  841: #endif
1.130     manu      842:
1.178     minskim   843:                /*
                    844:                 * Check the minimum TTL for socket.
                    845:                 */
                    846:                if (mtod(m, struct ip *)->ip_ttl < inp->inp_ip_minttl)
                    847:                        goto bad;
                    848:
1.53      itojun    849:                udp4_sendup(m, off, (struct sockaddr *)src, inp->inp_socket);
                    850:                rcvcnt++;
                    851:        }
                    852:
                    853: bad:
                    854:        return rcvcnt;
                    855: }
1.72      itojun    856: #endif
1.53      itojun    857:
                    858: #ifdef INET6
                    859: static int
1.119     matt      860: udp6_realinput(int af, struct sockaddr_in6 *src, struct sockaddr_in6 *dst,
                    861:        struct mbuf *m, int off)
1.53      itojun    862: {
1.79      itojun    863:        u_int16_t sport, dport;
1.53      itojun    864:        int rcvcnt;
1.146     rpaulo    865:        struct in6_addr src6, *dst6;
1.79      itojun    866:        const struct in_addr *dst4;
1.109     itojun    867:        struct inpcb_hdr *inph;
1.53      itojun    868:        struct in6pcb *in6p;
                    869:
                    870:        rcvcnt = 0;
                    871:        off += sizeof(struct udphdr);   /* now, offset of payload */
                    872:
                    873:        if (af != AF_INET && af != AF_INET6)
                    874:                goto bad;
                    875:        if (src->sin6_family != AF_INET6 || dst->sin6_family != AF_INET6)
                    876:                goto bad;
                    877:
1.146     rpaulo    878:        src6 = src->sin6_addr;
                    879:        if (sa6_recoverscope(src) != 0) {
                    880:                /* XXX: should be impossible. */
                    881:                goto bad;
                    882:        }
1.79      itojun    883:        sport = src->sin6_port;
1.146     rpaulo    884:
1.79      itojun    885:        dport = dst->sin6_port;
1.88      itojun    886:        dst4 = (struct in_addr *)&dst->sin6_addr.s6_addr[12];
1.146     rpaulo    887:        dst6 = &dst->sin6_addr;
1.53      itojun    888:
1.146     rpaulo    889:        if (IN6_IS_ADDR_MULTICAST(dst6) ||
1.79      itojun    890:            (af == AF_INET && IN_MULTICAST(dst4->s_addr))) {
1.53      itojun    891:                /*
                    892:                 * Deliver a multicast or broadcast datagram to *all* sockets
                    893:                 * for which the local and remote addresses and ports match
                    894:                 * those of the incoming datagram.  This allows more than
                    895:                 * one process to receive multi/broadcasts on the same port.
                    896:                 * (This really ought to be done for unicast datagrams as
                    897:                 * well, but that would cause problems with existing
                    898:                 * applications that open both address-specific sockets and
                    899:                 * a wildcard socket listening to the same port -- they would
                    900:                 * end up receiving duplicates of every unicast datagram.
                    901:                 * Those applications open the multiple sockets to overcome an
                    902:                 * inadequacy of the UDP socket interface, but for backwards
                    903:                 * compatibility we avoid the problem here rather than
                    904:                 * fixing the interface.  Maybe 4.5BSD will remedy this?)
                    905:                 */
                    906:
                    907:                /*
1.92      itojun    908:                 * KAME note: traditionally we dropped udpiphdr from mbuf here.
1.71      itojun    909:                 * we need udpiphdr for IPsec processing so we do that later.
1.53      itojun    910:                 */
                    911:                /*
                    912:                 * Locate pcb(s) for datagram.
                    913:                 */
1.109     itojun    914:                CIRCLEQ_FOREACH(inph, &udbtable.inpt_queue, inph_queue) {
                    915:                        in6p = (struct in6pcb *)inph;
                    916:                        if (in6p->in6p_af != AF_INET6)
                    917:                                continue;
                    918:
1.79      itojun    919:                        if (in6p->in6p_lport != dport)
1.53      itojun    920:                                continue;
                    921:                        if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) {
1.146     rpaulo    922:                                if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr,
                    923:                                    dst6))
1.53      itojun    924:                                        continue;
1.92      itojun    925:                        } else {
1.146     rpaulo    926:                                if (IN6_IS_ADDR_V4MAPPED(dst6) &&
1.85      itojun    927:                                    (in6p->in6p_flags & IN6P_IPV6_V6ONLY))
1.55      itojun    928:                                        continue;
                    929:                        }
1.53      itojun    930:                        if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
1.79      itojun    931:                                if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr,
                    932:                                    &src6) || in6p->in6p_fport != sport)
1.53      itojun    933:                                        continue;
1.92      itojun    934:                        } else {
1.79      itojun    935:                                if (IN6_IS_ADDR_V4MAPPED(&src6) &&
1.85      itojun    936:                                    (in6p->in6p_flags & IN6P_IPV6_V6ONLY))
1.55      itojun    937:                                        continue;
                    938:                        }
1.53      itojun    939:
                    940:                        udp6_sendup(m, off, (struct sockaddr *)src,
                    941:                                in6p->in6p_socket);
                    942:                        rcvcnt++;
                    943:
                    944:                        /*
                    945:                         * Don't look for additional matches if this one does
                    946:                         * not have either the SO_REUSEPORT or SO_REUSEADDR
                    947:                         * socket options set.  This heuristic avoids searching
                    948:                         * through all pcbs in the common case of a non-shared
                    949:                         * port.  It assumes that an application will never
                    950:                         * clear these options after setting them.
                    951:                         */
                    952:                        if ((in6p->in6p_socket->so_options &
                    953:                            (SO_REUSEPORT|SO_REUSEADDR)) == 0)
                    954:                                break;
                    955:                }
                    956:        } else {
                    957:                /*
                    958:                 * Locate pcb for datagram.
                    959:                 */
1.146     rpaulo    960:                in6p = in6_pcblookup_connect(&udbtable, &src6, sport, dst6,
1.180     dyoung    961:                                             dport, 0, 0);
1.53      itojun    962:                if (in6p == 0) {
1.166     thorpej   963:                        UDP_STATINC(UDP_STAT_PCBHASHMISS);
1.146     rpaulo    964:                        in6p = in6_pcblookup_bind(&udbtable, dst6, dport, 0);
1.82      itojun    965:                        if (in6p == 0)
1.53      itojun    966:                                return rcvcnt;
                    967:                }
                    968:
                    969:                udp6_sendup(m, off, (struct sockaddr *)src, in6p->in6p_socket);
                    970:                rcvcnt++;
                    971:        }
                    972:
                    973: bad:
                    974:        return rcvcnt;
                    975: }
                    976: #endif
1.1       cgd       977:
1.72      itojun    978: #ifdef INET
1.1       cgd       979: /*
                    980:  * Notify a udp user of an asynchronous error;
                    981:  * just wake up so that he can collect error status.
                    982:  */
1.7       mycroft   983: static void
1.119     matt      984: udp_notify(struct inpcb *inp, int errno)
1.1       cgd       985: {
                    986:        inp->inp_socket->so_error = errno;
                    987:        sorwakeup(inp->inp_socket);
                    988:        sowwakeup(inp->inp_socket);
                    989: }
                    990:
1.27      christos  991: void *
1.157     dyoung    992: udp_ctlinput(int cmd, const struct sockaddr *sa, void *v)
1.1       cgd       993: {
1.66      augustss  994:        struct ip *ip = v;
                    995:        struct udphdr *uh;
1.119     matt      996:        void (*notify)(struct inpcb *, int) = udp_notify;
1.21      mycroft   997:        int errno;
1.1       cgd       998:
1.53      itojun    999:        if (sa->sa_family != AF_INET
                   1000:         || sa->sa_len != sizeof(struct sockaddr_in))
1.51      itojun   1001:                return NULL;
1.20      mycroft  1002:        if ((unsigned)cmd >= PRC_NCMDS)
1.27      christos 1003:                return NULL;
1.20      mycroft  1004:        errno = inetctlerrmap[cmd];
1.18      mycroft  1005:        if (PRC_IS_REDIRECT(cmd))
1.19      mycroft  1006:                notify = in_rtchange, ip = 0;
1.18      mycroft  1007:        else if (cmd == PRC_HOSTDEAD)
1.19      mycroft  1008:                ip = 0;
1.23      cgd      1009:        else if (errno == 0)
1.27      christos 1010:                return NULL;
1.19      mycroft  1011:        if (ip) {
1.158     christos 1012:                uh = (struct udphdr *)((char *)ip + (ip->ip_hl << 2));
1.157     dyoung   1013:                in_pcbnotify(&udbtable, satocsin(sa)->sin_addr, uh->uh_dport,
1.34      mycroft  1014:                    ip->ip_src, uh->uh_sport, errno, notify);
1.53      itojun   1015:
                   1016:                /* XXX mapped address case */
1.19      mycroft  1017:        } else
1.157     dyoung   1018:                in_pcbnotifyall(&udbtable, satocsin(sa)->sin_addr, errno,
1.34      mycroft  1019:                    notify);
1.27      christos 1020:        return NULL;
1.1       cgd      1021: }
                   1022:
1.7       mycroft  1023: int
1.173     plunky   1024: udp_ctloutput(int op, struct socket *so, struct sockopt *sopt)
1.130     manu     1025: {
                   1026:        int s;
                   1027:        int error = 0;
                   1028:        struct inpcb *inp;
                   1029:        int family;
1.173     plunky   1030:        int optval;
1.130     manu     1031:
                   1032:        family = so->so_proto->pr_domain->dom_family;
                   1033:
                   1034:        s = splsoftnet();
                   1035:        switch (family) {
                   1036: #ifdef INET
                   1037:        case PF_INET:
1.173     plunky   1038:                if (sopt->sopt_level != IPPROTO_UDP) {
                   1039:                        error = ip_ctloutput(op, so, sopt);
1.130     manu     1040:                        goto end;
                   1041:                }
                   1042:                break;
                   1043: #endif
                   1044: #ifdef INET6
                   1045:        case PF_INET6:
1.173     plunky   1046:                if (sopt->sopt_level != IPPROTO_UDP) {
                   1047:                        error = ip6_ctloutput(op, so, sopt);
1.130     manu     1048:                        goto end;
                   1049:                }
                   1050:                break;
                   1051: #endif
                   1052:        default:
                   1053:                error = EAFNOSUPPORT;
                   1054:                goto end;
                   1055:        }
                   1056:
                   1057:
                   1058:        switch (op) {
                   1059:        case PRCO_SETOPT:
                   1060:                inp = sotoinpcb(so);
                   1061:
1.173     plunky   1062:                switch (sopt->sopt_name) {
1.130     manu     1063:                case UDP_ENCAP:
1.173     plunky   1064:                        error = sockopt_getint(sopt, &optval);
                   1065:                        if (error)
1.153     yamt     1066:                                break;
1.131     perry    1067:
1.173     plunky   1068:                        switch(optval) {
1.130     manu     1069:                        case 0:
                   1070:                                inp->inp_flags &= ~INP_ESPINUDP_ALL;
                   1071:                                break;
                   1072:
                   1073:                        case UDP_ENCAP_ESPINUDP:
                   1074:                                inp->inp_flags &= ~INP_ESPINUDP_ALL;
                   1075:                                inp->inp_flags |= INP_ESPINUDP;
                   1076:                                break;
1.131     perry    1077:
1.130     manu     1078:                        case UDP_ENCAP_ESPINUDP_NON_IKE:
                   1079:                                inp->inp_flags &= ~INP_ESPINUDP_ALL;
                   1080:                                inp->inp_flags |= INP_ESPINUDP_NON_IKE;
                   1081:                                break;
                   1082:                        default:
                   1083:                                error = EINVAL;
                   1084:                                break;
                   1085:                        }
                   1086:                        break;
1.183     christos 1087:
1.130     manu     1088:                default:
                   1089:                        error = ENOPROTOOPT;
                   1090:                        break;
                   1091:                }
                   1092:                break;
                   1093:
                   1094:        default:
                   1095:                error = EINVAL;
                   1096:                break;
1.131     perry    1097:        }
                   1098:
1.130     manu     1099: end:
                   1100:        splx(s);
                   1101:        return error;
                   1102: }
1.131     perry    1103:
1.130     manu     1104:
                   1105: int
1.27      christos 1106: udp_output(struct mbuf *m, ...)
                   1107: {
1.66      augustss 1108:        struct inpcb *inp;
                   1109:        struct udpiphdr *ui;
1.125     thorpej  1110:        struct route *ro;
1.66      augustss 1111:        int len = m->m_pkthdr.len;
1.31      mycroft  1112:        int error = 0;
1.27      christos 1113:        va_list ap;
                   1114:
1.98      matt     1115:        MCLAIM(m, &udp_tx_mowner);
1.27      christos 1116:        va_start(ap, m);
                   1117:        inp = va_arg(ap, struct inpcb *);
                   1118:        va_end(ap);
1.1       cgd      1119:
                   1120:        /*
                   1121:         * Calculate data length and get a mbuf
                   1122:         * for UDP and IP headers.
                   1123:         */
1.13      mycroft  1124:        M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT);
                   1125:        if (m == 0) {
                   1126:                error = ENOBUFS;
1.39      thorpej  1127:                goto release;
                   1128:        }
                   1129:
                   1130:        /*
                   1131:         * Compute the packet length of the IP header, and
                   1132:         * punt if the length looks bogus.
                   1133:         */
1.96      itojun   1134:        if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) {
1.39      thorpej  1135:                error = EMSGSIZE;
1.13      mycroft  1136:                goto release;
                   1137:        }
1.1       cgd      1138:
                   1139:        /*
                   1140:         * Fill in mbuf with extended UDP header
                   1141:         * and addresses and length put into network format.
                   1142:         */
                   1143:        ui = mtod(m, struct udpiphdr *);
                   1144:        ui->ui_pr = IPPROTO_UDP;
                   1145:        ui->ui_src = inp->inp_laddr;
                   1146:        ui->ui_dst = inp->inp_faddr;
                   1147:        ui->ui_sport = inp->inp_lport;
                   1148:        ui->ui_dport = inp->inp_fport;
1.78      thorpej  1149:        ui->ui_ulen = htons((u_int16_t)len + sizeof(struct udphdr));
1.1       cgd      1150:
1.125     thorpej  1151:        ro = &inp->inp_route;
                   1152:
1.1       cgd      1153:        /*
1.78      thorpej  1154:         * Set up checksum and output datagram.
1.1       cgd      1155:         */
                   1156:        if (udpcksum) {
1.78      thorpej  1157:                /*
                   1158:                 * XXX Cache pseudo-header checksum part for
                   1159:                 * XXX "connected" UDP sockets.
                   1160:                 */
                   1161:                ui->ui_sum = in_cksum_phdr(ui->ui_src.s_addr,
                   1162:                    ui->ui_dst.s_addr, htons((u_int16_t)len +
                   1163:                    sizeof(struct udphdr) + IPPROTO_UDP));
1.135     yamt     1164:                m->m_pkthdr.csum_flags = M_CSUM_UDPv4;
1.78      thorpej  1165:                m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
                   1166:        } else
                   1167:                ui->ui_sum = 0;
1.96      itojun   1168:        ((struct ip *)ui)->ip_len = htons(sizeof (struct udpiphdr) + len);
1.1       cgd      1169:        ((struct ip *)ui)->ip_ttl = inp->inp_ip.ip_ttl; /* XXX */
                   1170:        ((struct ip *)ui)->ip_tos = inp->inp_ip.ip_tos; /* XXX */
1.166     thorpej  1171:        UDP_STATINC(UDP_STAT_OPACKETS);
1.48      itojun   1172:
1.125     thorpej  1173:        return (ip_output(m, inp->inp_options, ro,
1.12      mycroft  1174:            inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST),
1.107     itojun   1175:            inp->inp_moptions, inp->inp_socket));
1.1       cgd      1176:
                   1177: release:
                   1178:        m_freem(m);
                   1179:        return (error);
                   1180: }
                   1181:
1.42      thorpej  1182: int    udp_sendspace = 9216;           /* really max datagram size */
                   1183: int    udp_recvspace = 40 * (1024 + sizeof(struct sockaddr_in));
1.1       cgd      1184:                                        /* 40 1K datagrams */
                   1185:
                   1186: /*ARGSUSED*/
1.7       mycroft  1187: int
1.119     matt     1188: udp_usrreq(struct socket *so, int req, struct mbuf *m, struct mbuf *nam,
1.145     christos 1189:        struct mbuf *control, struct lwp *l)
1.1       cgd      1190: {
1.66      augustss 1191:        struct inpcb *inp;
1.1       cgd      1192:        int s;
1.66      augustss 1193:        int error = 0;
1.1       cgd      1194:
                   1195:        if (req == PRU_CONTROL)
1.158     christos 1196:                return (in_control(so, (long)m, (void *)nam,
1.148     ad       1197:                    (struct ifnet *)control, l));
1.59      thorpej  1198:
1.149     tls      1199:        s = splsoftnet();
                   1200:
1.60      thorpej  1201:        if (req == PRU_PURGEIF) {
1.170     ad       1202:                mutex_enter(softnet_lock);
1.80      itojun   1203:                in_pcbpurgeif0(&udbtable, (struct ifnet *)control);
1.60      thorpej  1204:                in_purgeif((struct ifnet *)control);
                   1205:                in_pcbpurgeif(&udbtable, (struct ifnet *)control);
1.170     ad       1206:                mutex_exit(softnet_lock);
1.149     tls      1207:                splx(s);
1.59      thorpej  1208:                return (0);
                   1209:        }
1.31      mycroft  1210:
                   1211:        inp = sotoinpcb(so);
1.32      mycroft  1212: #ifdef DIAGNOSTIC
                   1213:        if (req != PRU_SEND && req != PRU_SENDOOB && control)
                   1214:                panic("udp_usrreq: unexpected control mbuf");
                   1215: #endif
1.170     ad       1216:        if (req == PRU_ATTACH) {
                   1217:                sosetlock(so);
                   1218:        } else if (inp == 0) {
1.31      mycroft  1219:                error = EINVAL;
                   1220:                goto release;
                   1221:        }
                   1222:
1.1       cgd      1223:        /*
                   1224:         * Note: need to block udp_input while changing
                   1225:         * the udp pcb queue and/or pcb addresses.
                   1226:         */
                   1227:        switch (req) {
                   1228:
                   1229:        case PRU_ATTACH:
1.31      mycroft  1230:                if (inp != 0) {
                   1231:                        error = EISCONN;
1.1       cgd      1232:                        break;
                   1233:                }
1.98      matt     1234: #ifdef MBUFTRACE
                   1235:                so->so_mowner = &udp_mowner;
                   1236:                so->so_rcv.sb_mowner = &udp_rx_mowner;
                   1237:                so->so_snd.sb_mowner = &udp_tx_mowner;
                   1238: #endif
1.31      mycroft  1239:                if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
                   1240:                        error = soreserve(so, udp_sendspace, udp_recvspace);
                   1241:                        if (error)
                   1242:                                break;
                   1243:                }
1.18      mycroft  1244:                error = in_pcballoc(so, &udbtable);
1.1       cgd      1245:                if (error)
                   1246:                        break;
1.31      mycroft  1247:                inp = sotoinpcb(so);
                   1248:                inp->inp_ip.ip_ttl = ip_defttl;
1.1       cgd      1249:                break;
                   1250:
                   1251:        case PRU_DETACH:
1.31      mycroft  1252:                in_pcbdetach(inp);
1.1       cgd      1253:                break;
                   1254:
                   1255:        case PRU_BIND:
1.148     ad       1256:                error = in_pcbbind(inp, nam, l);
1.1       cgd      1257:                break;
                   1258:
                   1259:        case PRU_LISTEN:
                   1260:                error = EOPNOTSUPP;
                   1261:                break;
                   1262:
                   1263:        case PRU_CONNECT:
1.148     ad       1264:                error = in_pcbconnect(inp, nam, l);
1.31      mycroft  1265:                if (error)
1.1       cgd      1266:                        break;
1.31      mycroft  1267:                soisconnected(so);
1.1       cgd      1268:                break;
                   1269:
                   1270:        case PRU_CONNECT2:
                   1271:                error = EOPNOTSUPP;
                   1272:                break;
                   1273:
                   1274:        case PRU_DISCONNECT:
1.31      mycroft  1275:                /*soisdisconnected(so);*/
                   1276:                so->so_state &= ~SS_ISCONNECTED;        /* XXX */
1.1       cgd      1277:                in_pcbdisconnect(inp);
1.34      mycroft  1278:                inp->inp_laddr = zeroin_addr;           /* XXX */
1.35      mycroft  1279:                in_pcbstate(inp, INP_BOUND);            /* XXX */
1.1       cgd      1280:                break;
                   1281:
                   1282:        case PRU_SHUTDOWN:
                   1283:                socantsendmore(so);
                   1284:                break;
                   1285:
1.31      mycroft  1286:        case PRU_RCVD:
                   1287:                error = EOPNOTSUPP;
1.1       cgd      1288:                break;
                   1289:
1.31      mycroft  1290:        case PRU_SEND:
1.32      mycroft  1291:                if (control && control->m_len) {
                   1292:                        m_freem(control);
                   1293:                        m_freem(m);
                   1294:                        error = EINVAL;
                   1295:                        break;
                   1296:                }
1.31      mycroft  1297:        {
1.35      mycroft  1298:                struct in_addr laddr;                   /* XXX */
1.1       cgd      1299:
1.181     mrg      1300:                memset(&laddr, 0, sizeof laddr);
1.31      mycroft  1301:                if (nam) {
1.35      mycroft  1302:                        laddr = inp->inp_laddr;         /* XXX */
1.31      mycroft  1303:                        if ((so->so_state & SS_ISCONNECTED) != 0) {
                   1304:                                error = EISCONN;
1.32      mycroft  1305:                                goto die;
1.31      mycroft  1306:                        }
1.148     ad       1307:                        error = in_pcbconnect(inp, nam, l);
1.100     matt     1308:                        if (error)
                   1309:                                goto die;
1.31      mycroft  1310:                } else {
                   1311:                        if ((so->so_state & SS_ISCONNECTED) == 0) {
                   1312:                                error = ENOTCONN;
1.32      mycroft  1313:                                goto die;
1.31      mycroft  1314:                        }
                   1315:                }
1.33      mycroft  1316:                error = udp_output(m, inp);
1.100     matt     1317:                m = NULL;
1.31      mycroft  1318:                if (nam) {
                   1319:                        in_pcbdisconnect(inp);
1.35      mycroft  1320:                        inp->inp_laddr = laddr;         /* XXX */
                   1321:                        in_pcbstate(inp, INP_BOUND);    /* XXX */
1.31      mycroft  1322:                }
1.100     matt     1323:          die:
                   1324:                if (m)
                   1325:                        m_freem(m);
1.31      mycroft  1326:        }
1.1       cgd      1327:                break;
                   1328:
                   1329:        case PRU_SENSE:
                   1330:                /*
                   1331:                 * stat: don't bother with a blocksize.
                   1332:                 */
1.31      mycroft  1333:                splx(s);
1.1       cgd      1334:                return (0);
                   1335:
1.31      mycroft  1336:        case PRU_RCVOOB:
                   1337:                error =  EOPNOTSUPP;
                   1338:                break;
                   1339:
1.1       cgd      1340:        case PRU_SENDOOB:
1.32      mycroft  1341:                m_freem(control);
1.31      mycroft  1342:                m_freem(m);
1.1       cgd      1343:                error =  EOPNOTSUPP;
                   1344:                break;
                   1345:
1.31      mycroft  1346:        case PRU_SOCKADDR:
                   1347:                in_setsockaddr(inp, nam);
                   1348:                break;
                   1349:
                   1350:        case PRU_PEERADDR:
                   1351:                in_setpeeraddr(inp, nam);
                   1352:                break;
1.1       cgd      1353:
                   1354:        default:
                   1355:                panic("udp_usrreq");
                   1356:        }
                   1357:
                   1358: release:
1.31      mycroft  1359:        splx(s);
1.1       cgd      1360:        return (error);
1.13      mycroft  1361: }
                   1362:
1.166     thorpej  1363: static int
                   1364: sysctl_net_inet_udp_stats(SYSCTLFN_ARGS)
                   1365: {
                   1366:
1.172     thorpej  1367:        return (NETSTAT_SYSCTL(udpstat_percpu, UDP_NSTATS));
1.166     thorpej  1368: }
                   1369:
1.13      mycroft  1370: /*
                   1371:  * Sysctl for udp variables.
                   1372:  */
1.179     pooka    1373: static void
                   1374: sysctl_net_inet_udp_setup(struct sysctllog **clog)
1.13      mycroft  1375: {
1.116     atatat   1376:        sysctl_createv(clog, 0, NULL, NULL,
                   1377:                       CTLFLAG_PERMANENT,
1.114     atatat   1378:                       CTLTYPE_NODE, "net", NULL,
                   1379:                       NULL, 0, NULL, 0,
                   1380:                       CTL_NET, CTL_EOL);
1.116     atatat   1381:        sysctl_createv(clog, 0, NULL, NULL,
                   1382:                       CTLFLAG_PERMANENT,
1.114     atatat   1383:                       CTLTYPE_NODE, "inet", NULL,
                   1384:                       NULL, 0, NULL, 0,
                   1385:                       CTL_NET, PF_INET, CTL_EOL);
1.116     atatat   1386:        sysctl_createv(clog, 0, NULL, NULL,
                   1387:                       CTLFLAG_PERMANENT,
1.122     atatat   1388:                       CTLTYPE_NODE, "udp",
                   1389:                       SYSCTL_DESCR("UDPv4 related settings"),
1.114     atatat   1390:                       NULL, 0, NULL, 0,
                   1391:                       CTL_NET, PF_INET, IPPROTO_UDP, CTL_EOL);
                   1392:
1.116     atatat   1393:        sysctl_createv(clog, 0, NULL, NULL,
                   1394:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.122     atatat   1395:                       CTLTYPE_INT, "checksum",
1.123     heas     1396:                       SYSCTL_DESCR("Compute UDP checksums"),
1.114     atatat   1397:                       NULL, 0, &udpcksum, 0,
                   1398:                       CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_CHECKSUM,
                   1399:                       CTL_EOL);
1.116     atatat   1400:        sysctl_createv(clog, 0, NULL, NULL,
                   1401:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.122     atatat   1402:                       CTLTYPE_INT, "sendspace",
                   1403:                       SYSCTL_DESCR("Default UDP send buffer size"),
1.114     atatat   1404:                       NULL, 0, &udp_sendspace, 0,
                   1405:                       CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_SENDSPACE,
                   1406:                       CTL_EOL);
1.116     atatat   1407:        sysctl_createv(clog, 0, NULL, NULL,
                   1408:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.122     atatat   1409:                       CTLTYPE_INT, "recvspace",
                   1410:                       SYSCTL_DESCR("Default UDP receive buffer size"),
1.114     atatat   1411:                       NULL, 0, &udp_recvspace, 0,
                   1412:                       CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_RECVSPACE,
                   1413:                       CTL_EOL);
1.125     thorpej  1414:        sysctl_createv(clog, 0, NULL, NULL,
                   1415:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1416:                       CTLTYPE_INT, "do_loopback_cksum",
                   1417:                       SYSCTL_DESCR("Perform UDP checksum on loopback"),
                   1418:                       NULL, 0, &udp_do_loopback_cksum, 0,
                   1419:                       CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_LOOPBACKCKSUM,
                   1420:                       CTL_EOL);
1.132     atatat   1421:        sysctl_createv(clog, 0, NULL, NULL,
                   1422:                       CTLFLAG_PERMANENT,
1.134     atatat   1423:                       CTLTYPE_STRUCT, "pcblist",
1.132     atatat   1424:                       SYSCTL_DESCR("UDP protocol control block list"),
                   1425:                       sysctl_inpcblist, 0, &udbtable, 0,
                   1426:                       CTL_NET, PF_INET, IPPROTO_UDP, CTL_CREATE,
                   1427:                       CTL_EOL);
1.139     elad     1428:        sysctl_createv(clog, 0, NULL, NULL,
                   1429:                       CTLFLAG_PERMANENT,
                   1430:                       CTLTYPE_STRUCT, "stats",
                   1431:                       SYSCTL_DESCR("UDP statistics"),
1.166     thorpej  1432:                       sysctl_net_inet_udp_stats, 0, NULL, 0,
1.139     elad     1433:                       CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_STATS,
                   1434:                       CTL_EOL);
1.1       cgd      1435: }
1.72      itojun   1436: #endif
1.130     manu     1437:
1.166     thorpej  1438: void
                   1439: udp_statinc(u_int stat)
                   1440: {
                   1441:
                   1442:        KASSERT(stat < UDP_NSTATS);
                   1443:        UDP_STATINC(stat);
                   1444: }
                   1445:
1.189   ! christos 1446: #if defined(INET) && defined(FAST_IPSEC)
1.130     manu     1447: /*
                   1448:  * Returns:
                   1449:  * 1 if the packet was processed
                   1450:  * 0 if normal UDP processing should take place
1.144     manu     1451:  * -1 if an error occurent and m was freed
1.130     manu     1452:  */
                   1453: static int
1.154     yamt     1454: udp4_espinudp(struct mbuf **mp, int off, struct sockaddr *src,
1.151     christos 1455:     struct socket *so)
1.130     manu     1456: {
                   1457:        size_t len;
1.158     christos 1458:        void *data;
1.130     manu     1459:        struct inpcb *inp;
                   1460:        size_t skip = 0;
                   1461:        size_t minlen;
                   1462:        size_t iphdrlen;
                   1463:        struct ip *ip;
1.136     manu     1464:        struct m_tag *tag;
                   1465:        struct udphdr *udphdr;
                   1466:        u_int16_t sport, dport;
1.144     manu     1467:        struct mbuf *m = *mp;
1.130     manu     1468:
1.131     perry    1469:        /*
1.130     manu     1470:         * Collapse the mbuf chain if the first mbuf is too short
                   1471:         * The longest case is: UDP + non ESP marker + ESP
                   1472:         */
                   1473:        minlen = off + sizeof(u_int64_t) + sizeof(struct esp);
                   1474:        if (minlen > m->m_pkthdr.len)
                   1475:                minlen = m->m_pkthdr.len;
                   1476:
                   1477:        if (m->m_len < minlen) {
1.144     manu     1478:                if ((*mp = m_pullup(m, minlen)) == NULL) {
1.130     manu     1479:                        printf("udp4_espinudp: m_pullup failed\n");
1.144     manu     1480:                        return -1;
1.130     manu     1481:                }
1.144     manu     1482:                m = *mp;
1.130     manu     1483:        }
                   1484:
1.131     perry    1485:        len = m->m_len - off;
1.158     christos 1486:        data = mtod(m, char *) + off;
1.130     manu     1487:        inp = sotoinpcb(so);
                   1488:
                   1489:        /* Ignore keepalive packets */
1.158     christos 1490:        if ((len == 1) && (*(unsigned char *)data == 0xff)) {
1.188     christos 1491:                m_free(m);
                   1492:                *mp = NULL; /* avoid any further processiong by caller ... */
1.130     manu     1493:                return 1;
                   1494:        }
                   1495:
1.131     perry    1496:        /*
                   1497:         * Check that the payload is long enough to hold
1.130     manu     1498:         * an ESP header and compute the length of encapsulation
1.131     perry    1499:         * header to remove
1.130     manu     1500:         */
                   1501:        if (inp->inp_flags & INP_ESPINUDP) {
                   1502:                u_int32_t *st = (u_int32_t *)data;
                   1503:
                   1504:                if ((len <= sizeof(struct esp)) || (*st == 0))
                   1505:                        return 0; /* Normal UDP processing */
                   1506:
                   1507:                skip = sizeof(struct udphdr);
                   1508:        }
                   1509:
                   1510:        if (inp->inp_flags & INP_ESPINUDP_NON_IKE) {
1.142     kleink   1511:                u_int32_t *st = (u_int32_t *)data;
1.130     manu     1512:
                   1513:                if ((len <= sizeof(u_int64_t) + sizeof(struct esp))
1.142     kleink   1514:                    || ((st[0] | st[1]) != 0))
1.130     manu     1515:                        return 0; /* Normal UDP processing */
1.131     perry    1516:
1.130     manu     1517:                skip = sizeof(struct udphdr) + sizeof(u_int64_t);
                   1518:        }
                   1519:
                   1520:        /*
1.136     manu     1521:         * Get the UDP ports. They are handled in network
                   1522:         * order everywhere in IPSEC_NAT_T code.
                   1523:         */
1.158     christos 1524:        udphdr = (struct udphdr *)((char *)data - skip);
1.136     manu     1525:        sport = udphdr->uh_sport;
                   1526:        dport = udphdr->uh_dport;
                   1527:
                   1528:        /*
1.130     manu     1529:         * Remove the UDP header (and possibly the non ESP marker)
                   1530:         * IP header lendth is iphdrlen
1.131     perry    1531:         * Before:
1.130     manu     1532:         *   <--- off --->
                   1533:         *   +----+------+-----+
                   1534:         *   | IP |  UDP | ESP |
                   1535:         *   +----+------+-----+
                   1536:         *        <-skip->
                   1537:         * After:
                   1538:         *          +----+-----+
                   1539:         *          | IP | ESP |
                   1540:         *          +----+-----+
                   1541:         *   <-skip->
                   1542:         */
                   1543:        iphdrlen = off - sizeof(struct udphdr);
1.158     christos 1544:        memmove(mtod(m, char *) + skip, mtod(m, void *), iphdrlen);
1.130     manu     1545:        m_adj(m, skip);
                   1546:
                   1547:        ip = mtod(m, struct ip *);
                   1548:        ip->ip_len = htons(ntohs(ip->ip_len) - skip);
                   1549:        ip->ip_p = IPPROTO_ESP;
                   1550:
                   1551:        /*
1.188     christos 1552:         * We have modified the packet - it is now ESP, so we should not
                   1553:         * return to UDP processing ...
                   1554:         *
1.136     manu     1555:         * Add a PACKET_TAG_IPSEC_NAT_T_PORT tag to remember
                   1556:         * the source UDP port. This is required if we want
                   1557:         * to select the right SPD for multiple hosts behind
                   1558:         * same NAT
                   1559:         */
1.137     manu     1560:        if ((tag = m_tag_get(PACKET_TAG_IPSEC_NAT_T_PORTS,
                   1561:            sizeof(sport) + sizeof(dport), M_DONTWAIT)) == NULL) {
                   1562:                printf("udp4_espinudp: m_tag_get failed\n");
1.188     christos 1563:                m_freem(m);
                   1564:                return -1;
1.137     manu     1565:        }
1.136     manu     1566:        ((u_int16_t *)(tag + 1))[0] = sport;
                   1567:        ((u_int16_t *)(tag + 1))[1] = dport;
1.188     christos 1568:        m_tag_prepend(m, tag);
1.136     manu     1569:
1.147     christos 1570: #ifdef FAST_IPSEC
1.188     christos 1571:        ipsec4_common_input(m, iphdrlen, IPPROTO_ESP);
1.147     christos 1572: #else
1.188     christos 1573:        esp4_input(m, iphdrlen);
1.147     christos 1574: #endif
1.130     manu     1575:
1.185     liamjfoy 1576:        /* We handled it, it shouldn't be handled by UDP */
1.188     christos 1577:        *mp = NULL; /* avoid free by caller ... */
1.130     manu     1578:        return 1;
                   1579: }
                   1580: #endif

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