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Annotation of src/sys/netinet/udp_usrreq.c, Revision 1.176

1.176   ! cegger      1: /*     $NetBSD: udp_usrreq.c,v 1.175 2009/03/18 16:00:22 cegger 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>
1.176   ! cegger     64: __KERNEL_RCSID(0, "$NetBSD: udp_usrreq.c,v 1.175 2009/03/18 16:00:22 cegger 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:
1.27      christos  121: #include <machine/stdarg.h>
                    122:
1.105     jonathan  123: #ifdef FAST_IPSEC
                    124: #include <netipsec/ipsec.h>
1.169     thorpej   125: #include <netipsec/ipsec_var.h>
                    126: #include <netipsec/ipsec_private.h>
1.147     christos  127: #include <netipsec/esp.h>
1.105     jonathan  128: #ifdef INET6
                    129: #include <netipsec/ipsec6.h>
                    130: #endif
1.169     thorpej   131: #endif /* FAST_IPSEC */
1.105     jonathan  132:
1.48      itojun    133: #ifdef IPSEC
                    134: #include <netinet6/ipsec.h>
1.169     thorpej   135: #include <netinet6/ipsec_private.h>
1.147     christos  136: #include <netinet6/esp.h>
1.48      itojun    137: #include <netkey/key.h>
1.169     thorpej   138: #endif /* IPSEC */
1.48      itojun    139:
1.174     christos  140: #ifdef COMPAT_50
                    141: #include <compat/sys/socket.h>
                    142: #endif
                    143:
1.64      ws        144: #ifdef IPKDB
                    145: #include <ipkdb/ipkdb.h>
                    146: #endif
                    147:
1.8       mycroft   148: /*
                    149:  * UDP protocol implementation.
                    150:  * Per RFC 768, August, 1980.
                    151:  */
                    152: int    udpcksum = 1;
1.141     yamt      153: int    udp_do_loopback_cksum = 0;
1.93      matt      154:
                    155: struct inpcbtable udbtable;
1.164     thorpej   156:
1.166     thorpej   157: percpu_t *udpstat_percpu;
1.8       mycroft   158:
1.72      itojun    159: #ifdef INET
1.130     manu      160: #ifdef IPSEC_NAT_T
1.144     manu      161: static int udp4_espinudp (struct mbuf **, int, struct sockaddr *,
1.130     manu      162:        struct socket *);
                    163: #endif
1.119     matt      164: static void udp4_sendup (struct mbuf *, int, struct sockaddr *,
                    165:        struct socket *);
                    166: static int udp4_realinput (struct sockaddr_in *, struct sockaddr_in *,
1.144     manu      167:        struct mbuf **, int);
1.129     yamt      168: static int udp4_input_checksum(struct mbuf *, const struct udphdr *, int, int);
1.72      itojun    169: #endif
1.53      itojun    170: #ifdef INET6
1.119     matt      171: static void udp6_sendup (struct mbuf *, int, struct sockaddr *,
                    172:        struct socket *);
                    173: static int udp6_realinput (int, struct sockaddr_in6 *,
                    174:        struct sockaddr_in6 *, struct mbuf *, int);
1.129     yamt      175: static int udp6_input_checksum(struct mbuf *, const struct udphdr *, int, int);
1.53      itojun    176: #endif
1.72      itojun    177: #ifdef INET
1.119     matt      178: static void udp_notify (struct inpcb *, int);
1.72      itojun    179: #endif
1.7       mycroft   180:
1.26      mycroft   181: #ifndef UDBHASHSIZE
                    182: #define        UDBHASHSIZE     128
                    183: #endif
                    184: int    udbhashsize = UDBHASHSIZE;
                    185:
1.98      matt      186: #ifdef MBUFTRACE
1.150     dogcow    187: struct mowner udp_mowner = MOWNER_INIT("udp", "");
                    188: struct mowner udp_rx_mowner = MOWNER_INIT("udp", "rx");
                    189: struct mowner udp_tx_mowner = MOWNER_INIT("udp", "tx");
1.98      matt      190: #endif
                    191:
1.78      thorpej   192: #ifdef UDP_CSUM_COUNTERS
                    193: #include <sys/device.h>
                    194:
1.140     yamt      195: #if defined(INET)
1.78      thorpej   196: struct evcnt udp_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    197:     NULL, "udp", "hwcsum bad");
                    198: struct evcnt udp_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    199:     NULL, "udp", "hwcsum ok");
                    200: struct evcnt udp_hwcsum_data = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    201:     NULL, "udp", "hwcsum data");
                    202: struct evcnt udp_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    203:     NULL, "udp", "swcsum");
                    204:
1.120     matt      205: EVCNT_ATTACH_STATIC(udp_hwcsum_bad);
                    206: EVCNT_ATTACH_STATIC(udp_hwcsum_ok);
                    207: EVCNT_ATTACH_STATIC(udp_hwcsum_data);
                    208: EVCNT_ATTACH_STATIC(udp_swcsum);
1.140     yamt      209: #endif /* defined(INET) */
                    210:
                    211: #if defined(INET6)
                    212: struct evcnt udp6_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    213:     NULL, "udp6", "hwcsum bad");
                    214: struct evcnt udp6_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    215:     NULL, "udp6", "hwcsum ok");
                    216: struct evcnt udp6_hwcsum_data = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    217:     NULL, "udp6", "hwcsum data");
                    218: struct evcnt udp6_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    219:     NULL, "udp6", "swcsum");
                    220:
                    221: EVCNT_ATTACH_STATIC(udp6_hwcsum_bad);
                    222: EVCNT_ATTACH_STATIC(udp6_hwcsum_ok);
                    223: EVCNT_ATTACH_STATIC(udp6_hwcsum_data);
                    224: EVCNT_ATTACH_STATIC(udp6_swcsum);
                    225: #endif /* defined(INET6) */
                    226:
                    227: #define        UDP_CSUM_COUNTER_INCR(ev)       (ev)->ev_count++
1.120     matt      228:
1.78      thorpej   229: #else
                    230:
                    231: #define        UDP_CSUM_COUNTER_INCR(ev)       /* nothing */
                    232:
                    233: #endif /* UDP_CSUM_COUNTERS */
                    234:
1.7       mycroft   235: void
1.119     matt      236: udp_init(void)
1.1       cgd       237: {
1.18      mycroft   238:
1.35      mycroft   239:        in_pcbinit(&udbtable, udbhashsize, udbhashsize);
1.78      thorpej   240:
1.98      matt      241:        MOWNER_ATTACH(&udp_tx_mowner);
                    242:        MOWNER_ATTACH(&udp_rx_mowner);
                    243:        MOWNER_ATTACH(&udp_mowner);
1.166     thorpej   244:
1.171     yamt      245: #ifdef INET
1.166     thorpej   246:        udpstat_percpu = percpu_alloc(sizeof(uint64_t) * UDP_NSTATS);
1.171     yamt      247: #endif
                    248: #ifdef INET6
                    249:        udp6stat_percpu = percpu_alloc(sizeof(uint64_t) * UDP6_NSTATS);
                    250: #endif
1.1       cgd       251: }
                    252:
1.129     yamt      253: /*
                    254:  * Checksum extended UDP header and data.
                    255:  */
                    256:
                    257: int
                    258: udp_input_checksum(int af, struct mbuf *m, const struct udphdr *uh,
                    259:     int iphlen, int len)
                    260: {
                    261:
                    262:        switch (af) {
1.72      itojun    263: #ifdef INET
1.129     yamt      264:        case AF_INET:
                    265:                return udp4_input_checksum(m, uh, iphlen, len);
                    266: #endif
                    267: #ifdef INET6
                    268:        case AF_INET6:
                    269:                return udp6_input_checksum(m, uh, iphlen, len);
                    270: #endif
                    271:        }
                    272: #ifdef DIAGNOSTIC
                    273:        panic("udp_input_checksum: unknown af %d", af);
                    274: #endif
                    275:        /* NOTREACHED */
                    276:        return -1;
                    277: }
                    278:
                    279: #ifdef INET
                    280:
                    281: /*
                    282:  * Checksum extended UDP header and data.
                    283:  */
                    284:
                    285: static int
                    286: udp4_input_checksum(struct mbuf *m, const struct udphdr *uh,
                    287:     int iphlen, int len)
                    288: {
                    289:
                    290:        /*
                    291:         * XXX it's better to record and check if this mbuf is
                    292:         * already checked.
                    293:         */
                    294:
                    295:        if (uh->uh_sum == 0)
                    296:                return 0;
                    297:
                    298:        switch (m->m_pkthdr.csum_flags &
                    299:            ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_UDPv4) |
                    300:            M_CSUM_TCP_UDP_BAD | M_CSUM_DATA)) {
                    301:        case M_CSUM_UDPv4|M_CSUM_TCP_UDP_BAD:
                    302:                UDP_CSUM_COUNTER_INCR(&udp_hwcsum_bad);
                    303:                goto badcsum;
                    304:
                    305:        case M_CSUM_UDPv4|M_CSUM_DATA: {
                    306:                u_int32_t hw_csum = m->m_pkthdr.csum_data;
                    307:
                    308:                UDP_CSUM_COUNTER_INCR(&udp_hwcsum_data);
                    309:                if (m->m_pkthdr.csum_flags & M_CSUM_NO_PSEUDOHDR) {
                    310:                        const struct ip *ip =
                    311:                            mtod(m, const struct ip *);
                    312:
                    313:                        hw_csum = in_cksum_phdr(ip->ip_src.s_addr,
                    314:                            ip->ip_dst.s_addr,
                    315:                            htons(hw_csum + len + IPPROTO_UDP));
                    316:                }
                    317:                if ((hw_csum ^ 0xffff) != 0)
                    318:                        goto badcsum;
                    319:                break;
                    320:        }
                    321:
                    322:        case M_CSUM_UDPv4:
                    323:                /* Checksum was okay. */
                    324:                UDP_CSUM_COUNTER_INCR(&udp_hwcsum_ok);
                    325:                break;
                    326:
                    327:        default:
                    328:                /*
                    329:                 * Need to compute it ourselves.  Maybe skip checksum
                    330:                 * on loopback interfaces.
                    331:                 */
                    332:                if (__predict_true(!(m->m_pkthdr.rcvif->if_flags &
                    333:                                     IFF_LOOPBACK) ||
                    334:                                   udp_do_loopback_cksum)) {
                    335:                        UDP_CSUM_COUNTER_INCR(&udp_swcsum);
                    336:                        if (in4_cksum(m, IPPROTO_UDP, iphlen, len) != 0)
                    337:                                goto badcsum;
                    338:                }
                    339:                break;
                    340:        }
                    341:
                    342:        return 0;
                    343:
                    344: badcsum:
1.166     thorpej   345:        UDP_STATINC(UDP_STAT_BADSUM);
1.129     yamt      346:        return -1;
                    347: }
                    348:
1.7       mycroft   349: void
1.27      christos  350: udp_input(struct mbuf *m, ...)
1.1       cgd       351: {
1.53      itojun    352:        va_list ap;
                    353:        struct sockaddr_in src, dst;
                    354:        struct ip *ip;
                    355:        struct udphdr *uh;
1.97      simonb    356:        int iphlen;
1.53      itojun    357:        int len;
                    358:        int n;
1.96      itojun    359:        u_int16_t ip_len;
1.53      itojun    360:
                    361:        va_start(ap, m);
                    362:        iphlen = va_arg(ap, int);
1.97      simonb    363:        (void)va_arg(ap, int);          /* ignore value, advance ap */
1.53      itojun    364:        va_end(ap);
                    365:
1.98      matt      366:        MCLAIM(m, &udp_rx_mowner);
1.166     thorpej   367:        UDP_STATINC(UDP_STAT_IPACKETS);
1.53      itojun    368:
                    369:        /*
                    370:         * Get IP and UDP header together in first mbuf.
                    371:         */
                    372:        ip = mtod(m, struct ip *);
                    373:        IP6_EXTHDR_GET(uh, struct udphdr *, m, iphlen, sizeof(struct udphdr));
                    374:        if (uh == NULL) {
1.166     thorpej   375:                UDP_STATINC(UDP_STAT_HDROPS);
1.53      itojun    376:                return;
                    377:        }
1.95      thorpej   378:        KASSERT(UDP_HDR_ALIGNED_P(uh));
1.53      itojun    379:
1.57      itojun    380:        /* destination port of 0 is illegal, based on RFC768. */
                    381:        if (uh->uh_dport == 0)
                    382:                goto bad;
                    383:
1.53      itojun    384:        /*
                    385:         * Make mbuf data length reflect UDP length.
                    386:         * If not enough data to reflect UDP length, drop.
                    387:         */
1.96      itojun    388:        ip_len = ntohs(ip->ip_len);
1.53      itojun    389:        len = ntohs((u_int16_t)uh->uh_ulen);
1.96      itojun    390:        if (ip_len != iphlen + len) {
                    391:                if (ip_len < iphlen + len || len < sizeof(struct udphdr)) {
1.166     thorpej   392:                        UDP_STATINC(UDP_STAT_BADLEN);
1.53      itojun    393:                        goto bad;
                    394:                }
1.96      itojun    395:                m_adj(m, iphlen + len - ip_len);
1.53      itojun    396:        }
                    397:
                    398:        /*
                    399:         * Checksum extended UDP header and data.
                    400:         */
1.129     yamt      401:        if (udp4_input_checksum(m, uh, iphlen, len))
                    402:                goto badcsum;
1.53      itojun    403:
                    404:        /* construct source and dst sockaddrs. */
1.159     dyoung    405:        sockaddr_in_init(&src, &ip->ip_src, uh->uh_sport);
                    406:        sockaddr_in_init(&dst, &ip->ip_dst, uh->uh_dport);
1.53      itojun    407:
1.144     manu      408:        if ((n = udp4_realinput(&src, &dst, &m, iphlen)) == -1) {
1.166     thorpej   409:                UDP_STATINC(UDP_STAT_HDROPS);
1.144     manu      410:                return;
                    411:        }
1.53      itojun    412: #ifdef INET6
                    413:        if (IN_MULTICAST(ip->ip_dst.s_addr) || n == 0) {
                    414:                struct sockaddr_in6 src6, dst6;
                    415:
1.175     cegger    416:                memset(&src6, 0, sizeof(src6));
1.53      itojun    417:                src6.sin6_family = AF_INET6;
                    418:                src6.sin6_len = sizeof(struct sockaddr_in6);
                    419:                src6.sin6_addr.s6_addr[10] = src6.sin6_addr.s6_addr[11] = 0xff;
1.176   ! cegger    420:                memcpy( &src6.sin6_addr.s6_addr[12], &ip->ip_src,
1.53      itojun    421:                        sizeof(ip->ip_src));
                    422:                src6.sin6_port = uh->uh_sport;
1.175     cegger    423:                memset(&dst6, 0, sizeof(dst6));
1.53      itojun    424:                dst6.sin6_family = AF_INET6;
                    425:                dst6.sin6_len = sizeof(struct sockaddr_in6);
                    426:                dst6.sin6_addr.s6_addr[10] = dst6.sin6_addr.s6_addr[11] = 0xff;
1.176   ! cegger    427:                memcpy( &dst6.sin6_addr.s6_addr[12], &ip->ip_dst,
1.53      itojun    428:                        sizeof(ip->ip_dst));
                    429:                dst6.sin6_port = uh->uh_dport;
                    430:
                    431:                n += udp6_realinput(AF_INET, &src6, &dst6, m, iphlen);
                    432:        }
                    433: #endif
                    434:
                    435:        if (n == 0) {
                    436:                if (m->m_flags & (M_BCAST | M_MCAST)) {
1.166     thorpej   437:                        UDP_STATINC(UDP_STAT_NOPORTBCAST);
1.53      itojun    438:                        goto bad;
                    439:                }
1.166     thorpej   440:                UDP_STATINC(UDP_STAT_NOPORT);
1.64      ws        441: #ifdef IPKDB
1.53      itojun    442:                if (checkipkdb(&ip->ip_src, uh->uh_sport, uh->uh_dport,
                    443:                                m, iphlen + sizeof(struct udphdr),
                    444:                                m->m_pkthdr.len - iphlen - sizeof(struct udphdr))) {
                    445:                        /*
                    446:                         * It was a debugger connect packet,
                    447:                         * just drop it now
                    448:                         */
                    449:                        goto bad;
                    450:                }
                    451: #endif
                    452:                icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0);
                    453:                m = NULL;
                    454:        }
                    455:
                    456: bad:
                    457:        if (m)
                    458:                m_freem(m);
1.78      thorpej   459:        return;
                    460:
                    461: badcsum:
                    462:        m_freem(m);
1.53      itojun    463: }
1.72      itojun    464: #endif
1.53      itojun    465:
                    466: #ifdef INET6
1.129     yamt      467: static int
                    468: udp6_input_checksum(struct mbuf *m, const struct udphdr *uh, int off, int len)
                    469: {
                    470:
1.140     yamt      471:        /*
                    472:         * XXX it's better to record and check if this mbuf is
                    473:         * already checked.
                    474:         */
                    475:
1.129     yamt      476:        if (__predict_false((m->m_flags & M_LOOP) && !udp_do_loopback_cksum)) {
                    477:                goto good;
                    478:        }
                    479:        if (uh->uh_sum == 0) {
1.168     thorpej   480:                UDP6_STATINC(UDP6_STAT_NOSUM);
1.129     yamt      481:                goto bad;
                    482:        }
1.140     yamt      483:
                    484:        switch (m->m_pkthdr.csum_flags &
                    485:            ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_UDPv6) |
                    486:            M_CSUM_TCP_UDP_BAD | M_CSUM_DATA)) {
                    487:        case M_CSUM_UDPv6|M_CSUM_TCP_UDP_BAD:
                    488:                UDP_CSUM_COUNTER_INCR(&udp6_hwcsum_bad);
1.168     thorpej   489:                UDP6_STATINC(UDP6_STAT_BADSUM);
1.129     yamt      490:                goto bad;
1.140     yamt      491:
                    492: #if 0 /* notyet */
                    493:        case M_CSUM_UDPv6|M_CSUM_DATA:
                    494: #endif
                    495:
                    496:        case M_CSUM_UDPv6:
                    497:                /* Checksum was okay. */
                    498:                UDP_CSUM_COUNTER_INCR(&udp6_hwcsum_ok);
                    499:                break;
                    500:
                    501:        default:
                    502:                /*
                    503:                 * Need to compute it ourselves.  Maybe skip checksum
                    504:                 * on loopback interfaces.
                    505:                 */
                    506:                UDP_CSUM_COUNTER_INCR(&udp6_swcsum);
                    507:                if (in6_cksum(m, IPPROTO_UDP, off, len) != 0) {
1.168     thorpej   508:                        UDP6_STATINC(UDP6_STAT_BADSUM);
1.140     yamt      509:                        goto bad;
                    510:                }
1.129     yamt      511:        }
                    512:
                    513: good:
                    514:        return 0;
                    515: bad:
                    516:        return -1;
                    517: }
                    518:
1.53      itojun    519: int
1.154     yamt      520: udp6_input(struct mbuf **mp, int *offp, int proto)
1.53      itojun    521: {
                    522:        struct mbuf *m = *mp;
                    523:        int off = *offp;
                    524:        struct sockaddr_in6 src, dst;
                    525:        struct ip6_hdr *ip6;
                    526:        struct udphdr *uh;
                    527:        u_int32_t plen, ulen;
                    528:
1.76      itojun    529:        ip6 = mtod(m, struct ip6_hdr *);
                    530:
1.53      itojun    531: #if defined(NFAITH) && 0 < NFAITH
1.76      itojun    532:        if (faithprefix(&ip6->ip6_dst)) {
                    533:                /* send icmp6 host unreach? */
                    534:                m_freem(m);
                    535:                return IPPROTO_DONE;
1.53      itojun    536:        }
                    537: #endif
                    538:
1.168     thorpej   539:        UDP6_STATINC(UDP6_STAT_IPACKETS);
1.53      itojun    540:
                    541:        /* check for jumbogram is done in ip6_input.  we can trust pkthdr.len */
                    542:        plen = m->m_pkthdr.len - off;
                    543:        IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(struct udphdr));
                    544:        if (uh == NULL) {
1.167     thorpej   545:                IP6_STATINC(IP6_STAT_TOOSHORT);
1.53      itojun    546:                return IPPROTO_DONE;
                    547:        }
1.95      thorpej   548:        KASSERT(UDP_HDR_ALIGNED_P(uh));
1.53      itojun    549:        ulen = ntohs((u_short)uh->uh_ulen);
1.69      itojun    550:        /*
                    551:         * RFC2675 section 4: jumbograms will have 0 in the UDP header field,
                    552:         * iff payload length > 0xffff.
                    553:         */
1.53      itojun    554:        if (ulen == 0 && plen > 0xffff)
                    555:                ulen = plen;
                    556:
                    557:        if (plen != ulen) {
1.168     thorpej   558:                UDP6_STATINC(UDP6_STAT_BADLEN);
1.54      itojun    559:                goto bad;
                    560:        }
                    561:
1.57      itojun    562:        /* destination port of 0 is illegal, based on RFC768. */
                    563:        if (uh->uh_dport == 0)
                    564:                goto bad;
                    565:
1.54      itojun    566:        /* Be proactive about malicious use of IPv4 mapped address */
                    567:        if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
                    568:            IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
                    569:                /* XXX stat */
1.53      itojun    570:                goto bad;
                    571:        }
                    572:
                    573:        /*
1.125     thorpej   574:         * Checksum extended UDP header and data.  Maybe skip checksum
                    575:         * on loopback interfaces.
1.53      itojun    576:         */
1.129     yamt      577:        if (udp6_input_checksum(m, uh, off, ulen))
                    578:                goto bad;
1.53      itojun    579:
                    580:        /*
                    581:         * Construct source and dst sockaddrs.
                    582:         */
1.175     cegger    583:        memset(&src, 0, sizeof(src));
1.53      itojun    584:        src.sin6_family = AF_INET6;
                    585:        src.sin6_len = sizeof(struct sockaddr_in6);
1.146     rpaulo    586:        src.sin6_addr = ip6->ip6_src;
1.53      itojun    587:        src.sin6_port = uh->uh_sport;
1.175     cegger    588:        memset(&dst, 0, sizeof(dst));
1.53      itojun    589:        dst.sin6_family = AF_INET6;
                    590:        dst.sin6_len = sizeof(struct sockaddr_in6);
1.146     rpaulo    591:        dst.sin6_addr = ip6->ip6_dst;
1.53      itojun    592:        dst.sin6_port = uh->uh_dport;
                    593:
                    594:        if (udp6_realinput(AF_INET6, &src, &dst, m, off) == 0) {
                    595:                if (m->m_flags & M_MCAST) {
1.168     thorpej   596:                        UDP6_STATINC(UDP6_STAT_NOPORTMCAST);
1.53      itojun    597:                        goto bad;
                    598:                }
1.168     thorpej   599:                UDP6_STATINC(UDP6_STAT_NOPORT);
1.53      itojun    600:                icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
                    601:                m = NULL;
                    602:        }
                    603:
                    604: bad:
                    605:        if (m)
                    606:                m_freem(m);
                    607:        return IPPROTO_DONE;
                    608: }
                    609: #endif
                    610:
1.72      itojun    611: #ifdef INET
1.53      itojun    612: static void
1.119     matt      613: udp4_sendup(struct mbuf *m, int off /* offset of data portion */,
                    614:        struct sockaddr *src, struct socket *so)
1.53      itojun    615: {
                    616:        struct mbuf *opts = NULL;
                    617:        struct mbuf *n;
                    618:        struct inpcb *inp = NULL;
                    619:
                    620:        if (!so)
                    621:                return;
                    622:        switch (so->so_proto->pr_domain->dom_family) {
                    623:        case AF_INET:
                    624:                inp = sotoinpcb(so);
                    625:                break;
                    626: #ifdef INET6
                    627:        case AF_INET6:
                    628:                break;
                    629: #endif
                    630:        default:
                    631:                return;
                    632:        }
                    633:
1.105     jonathan  634: #if defined(IPSEC) || defined(FAST_IPSEC)
1.53      itojun    635:        /* check AH/ESP integrity. */
                    636:        if (so != NULL && ipsec4_in_reject_so(m, so)) {
1.169     thorpej   637:                IPSEC_STATINC(IPSEC_STAT_IN_POLVIO);
1.162     dyoung    638:                if ((n = m_copypacket(m, M_DONTWAIT)) != NULL)
1.110     itojun    639:                        icmp_error(n, ICMP_UNREACH, ICMP_UNREACH_ADMIN_PROHIBIT,
                    640:                            0, 0);
1.53      itojun    641:                return;
                    642:        }
                    643: #endif /*IPSEC*/
                    644:
1.162     dyoung    645:        if ((n = m_copypacket(m, M_DONTWAIT)) != NULL) {
1.53      itojun    646:                if (inp && (inp->inp_flags & INP_CONTROLOPTS
1.174     christos  647: #ifdef SO_OTIMESTAMP
                    648:                         || so->so_options & SO_OTIMESTAMP
                    649: #endif
1.53      itojun    650:                         || so->so_options & SO_TIMESTAMP)) {
                    651:                        struct ip *ip = mtod(n, struct ip *);
                    652:                        ip_savecontrol(inp, &opts, ip, n);
                    653:                }
                    654:
                    655:                m_adj(n, off);
                    656:                if (sbappendaddr(&so->so_rcv, src, n,
                    657:                                opts) == 0) {
                    658:                        m_freem(n);
                    659:                        if (opts)
                    660:                                m_freem(opts);
1.124     darrenr   661:                        so->so_rcv.sb_overflowed++;
1.166     thorpej   662:                        UDP_STATINC(UDP_STAT_FULLSOCK);
1.53      itojun    663:                } else
                    664:                        sorwakeup(so);
                    665:        }
                    666: }
1.72      itojun    667: #endif
1.53      itojun    668:
                    669: #ifdef INET6
                    670: static void
1.119     matt      671: udp6_sendup(struct mbuf *m, int off /* offset of data portion */,
                    672:        struct sockaddr *src, struct socket *so)
1.53      itojun    673: {
                    674:        struct mbuf *opts = NULL;
                    675:        struct mbuf *n;
                    676:        struct in6pcb *in6p = NULL;
                    677:
                    678:        if (!so)
                    679:                return;
                    680:        if (so->so_proto->pr_domain->dom_family != AF_INET6)
                    681:                return;
                    682:        in6p = sotoin6pcb(so);
                    683:
1.105     jonathan  684: #if defined(IPSEC) || defined(FAST_IPSEC)
1.53      itojun    685:        /* check AH/ESP integrity. */
                    686:        if (so != NULL && ipsec6_in_reject_so(m, so)) {
1.169     thorpej   687:                IPSEC6_STATINC(IPSEC_STAT_IN_POLVIO);
1.162     dyoung    688:                if ((n = m_copypacket(m, M_DONTWAIT)) != NULL)
1.110     itojun    689:                        icmp6_error(n, ICMP6_DST_UNREACH,
                    690:                            ICMP6_DST_UNREACH_ADMIN, 0);
1.53      itojun    691:                return;
                    692:        }
                    693: #endif /*IPSEC*/
                    694:
1.162     dyoung    695:        if ((n = m_copypacket(m, M_DONTWAIT)) != NULL) {
1.53      itojun    696:                if (in6p && (in6p->in6p_flags & IN6P_CONTROLOPTS
1.174     christos  697: #ifdef SO_OTIMESTAMP
                    698:                    || in6p->in6p_socket->so_options & SO_OTIMESTAMP
                    699: #endif
                    700:                    || in6p->in6p_socket->so_options & SO_TIMESTAMP)) {
1.53      itojun    701:                        struct ip6_hdr *ip6 = mtod(n, struct ip6_hdr *);
                    702:                        ip6_savecontrol(in6p, &opts, ip6, n);
                    703:                }
                    704:
                    705:                m_adj(n, off);
                    706:                if (sbappendaddr(&so->so_rcv, src, n, opts) == 0) {
                    707:                        m_freem(n);
                    708:                        if (opts)
                    709:                                m_freem(opts);
1.124     darrenr   710:                        so->so_rcv.sb_overflowed++;
1.168     thorpej   711:                        UDP6_STATINC(UDP6_STAT_FULLSOCK);
1.53      itojun    712:                } else
                    713:                        sorwakeup(so);
                    714:        }
                    715: }
                    716: #endif
                    717:
1.72      itojun    718: #ifdef INET
1.53      itojun    719: static int
1.119     matt      720: udp4_realinput(struct sockaddr_in *src, struct sockaddr_in *dst,
1.144     manu      721:        struct mbuf **mp, int off /* offset of udphdr */)
1.53      itojun    722: {
                    723:        u_int16_t *sport, *dport;
                    724:        int rcvcnt;
                    725:        struct in_addr *src4, *dst4;
1.109     itojun    726:        struct inpcb_hdr *inph;
1.53      itojun    727:        struct inpcb *inp;
1.144     manu      728:        struct mbuf *m = *mp;
1.53      itojun    729:
                    730:        rcvcnt = 0;
                    731:        off += sizeof(struct udphdr);   /* now, offset of payload */
                    732:
                    733:        if (src->sin_family != AF_INET || dst->sin_family != AF_INET)
                    734:                goto bad;
                    735:
                    736:        src4 = &src->sin_addr;
                    737:        sport = &src->sin_port;
                    738:        dst4 = &dst->sin_addr;
                    739:        dport = &dst->sin_port;
                    740:
1.73      itojun    741:        if (IN_MULTICAST(dst4->s_addr) ||
1.53      itojun    742:            in_broadcast(*dst4, m->m_pkthdr.rcvif)) {
                    743:                /*
                    744:                 * Deliver a multicast or broadcast datagram to *all* sockets
                    745:                 * for which the local and remote addresses and ports match
                    746:                 * those of the incoming datagram.  This allows more than
                    747:                 * one process to receive multi/broadcasts on the same port.
                    748:                 * (This really ought to be done for unicast datagrams as
                    749:                 * well, but that would cause problems with existing
                    750:                 * applications that open both address-specific sockets and
                    751:                 * a wildcard socket listening to the same port -- they would
                    752:                 * end up receiving duplicates of every unicast datagram.
                    753:                 * Those applications open the multiple sockets to overcome an
                    754:                 * inadequacy of the UDP socket interface, but for backwards
                    755:                 * compatibility we avoid the problem here rather than
                    756:                 * fixing the interface.  Maybe 4.5BSD will remedy this?)
                    757:                 */
                    758:
                    759:                /*
1.92      itojun    760:                 * KAME note: traditionally we dropped udpiphdr from mbuf here.
1.71      itojun    761:                 * we need udpiphdr for IPsec processing so we do that later.
1.53      itojun    762:                 */
                    763:                /*
                    764:                 * Locate pcb(s) for datagram.
                    765:                 */
1.109     itojun    766:                CIRCLEQ_FOREACH(inph, &udbtable.inpt_queue, inph_queue) {
                    767:                        inp = (struct inpcb *)inph;
                    768:                        if (inp->inp_af != AF_INET)
                    769:                                continue;
                    770:
1.53      itojun    771:                        if (inp->inp_lport != *dport)
                    772:                                continue;
                    773:                        if (!in_nullhost(inp->inp_laddr)) {
                    774:                                if (!in_hosteq(inp->inp_laddr, *dst4))
                    775:                                        continue;
                    776:                        }
                    777:                        if (!in_nullhost(inp->inp_faddr)) {
                    778:                                if (!in_hosteq(inp->inp_faddr, *src4) ||
                    779:                                    inp->inp_fport != *sport)
                    780:                                        continue;
                    781:                        }
                    782:
                    783:                        udp4_sendup(m, off, (struct sockaddr *)src,
                    784:                                inp->inp_socket);
                    785:                        rcvcnt++;
                    786:
                    787:                        /*
                    788:                         * Don't look for additional matches if this one does
                    789:                         * not have either the SO_REUSEPORT or SO_REUSEADDR
                    790:                         * socket options set.  This heuristic avoids searching
                    791:                         * through all pcbs in the common case of a non-shared
                    792:                         * port.  It assumes that an application will never
                    793:                         * clear these options after setting them.
                    794:                         */
                    795:                        if ((inp->inp_socket->so_options &
                    796:                            (SO_REUSEPORT|SO_REUSEADDR)) == 0)
                    797:                                break;
                    798:                }
                    799:        } else {
                    800:                /*
                    801:                 * Locate pcb for datagram.
                    802:                 */
                    803:                inp = in_pcblookup_connect(&udbtable, *src4, *sport, *dst4, *dport);
                    804:                if (inp == 0) {
1.166     thorpej   805:                        UDP_STATINC(UDP_STAT_PCBHASHMISS);
1.53      itojun    806:                        inp = in_pcblookup_bind(&udbtable, *dst4, *dport);
1.82      itojun    807:                        if (inp == 0)
1.53      itojun    808:                                return rcvcnt;
                    809:                }
                    810:
1.130     manu      811: #ifdef IPSEC_NAT_T
                    812:                /* Handle ESP over UDP */
                    813:                if (inp->inp_flags & INP_ESPINUDP_ALL) {
                    814:                        struct sockaddr *sa = (struct sockaddr *)src;
                    815:
1.144     manu      816:                        switch(udp4_espinudp(mp, off, sa, inp->inp_socket)) {
                    817:                        case -1:        /* Error, m was freeed */
                    818:                                rcvcnt = -1;
                    819:                                goto bad;
                    820:                                break;
                    821:
                    822:                        case 1:         /* ESP over UDP */
1.130     manu      823:                                rcvcnt++;
                    824:                                goto bad;
1.144     manu      825:                                break;
                    826:
                    827:                        case 0:         /* plain UDP */
                    828:                        default:        /* Unexpected */
                    829:                                /*
                    830:                                 * Normal UDP processing will take place
                    831:                                 * m may have changed.
                    832:                                 */
                    833:                                m = *mp;
                    834:                                break;
1.130     manu      835:                        }
                    836:                }
                    837: #endif
                    838:
1.53      itojun    839:                udp4_sendup(m, off, (struct sockaddr *)src, inp->inp_socket);
                    840:                rcvcnt++;
                    841:        }
                    842:
                    843: bad:
                    844:        return rcvcnt;
                    845: }
1.72      itojun    846: #endif
1.53      itojun    847:
                    848: #ifdef INET6
                    849: static int
1.119     matt      850: udp6_realinput(int af, struct sockaddr_in6 *src, struct sockaddr_in6 *dst,
                    851:        struct mbuf *m, int off)
1.53      itojun    852: {
1.79      itojun    853:        u_int16_t sport, dport;
1.53      itojun    854:        int rcvcnt;
1.146     rpaulo    855:        struct in6_addr src6, *dst6;
1.79      itojun    856:        const struct in_addr *dst4;
1.109     itojun    857:        struct inpcb_hdr *inph;
1.53      itojun    858:        struct in6pcb *in6p;
                    859:
                    860:        rcvcnt = 0;
                    861:        off += sizeof(struct udphdr);   /* now, offset of payload */
                    862:
                    863:        if (af != AF_INET && af != AF_INET6)
                    864:                goto bad;
                    865:        if (src->sin6_family != AF_INET6 || dst->sin6_family != AF_INET6)
                    866:                goto bad;
                    867:
1.146     rpaulo    868:        src6 = src->sin6_addr;
                    869:        if (sa6_recoverscope(src) != 0) {
                    870:                /* XXX: should be impossible. */
                    871:                goto bad;
                    872:        }
1.79      itojun    873:        sport = src->sin6_port;
1.146     rpaulo    874:
1.79      itojun    875:        dport = dst->sin6_port;
1.88      itojun    876:        dst4 = (struct in_addr *)&dst->sin6_addr.s6_addr[12];
1.146     rpaulo    877:        dst6 = &dst->sin6_addr;
1.53      itojun    878:
1.146     rpaulo    879:        if (IN6_IS_ADDR_MULTICAST(dst6) ||
1.79      itojun    880:            (af == AF_INET && IN_MULTICAST(dst4->s_addr))) {
1.53      itojun    881:                /*
                    882:                 * Deliver a multicast or broadcast datagram to *all* sockets
                    883:                 * for which the local and remote addresses and ports match
                    884:                 * those of the incoming datagram.  This allows more than
                    885:                 * one process to receive multi/broadcasts on the same port.
                    886:                 * (This really ought to be done for unicast datagrams as
                    887:                 * well, but that would cause problems with existing
                    888:                 * applications that open both address-specific sockets and
                    889:                 * a wildcard socket listening to the same port -- they would
                    890:                 * end up receiving duplicates of every unicast datagram.
                    891:                 * Those applications open the multiple sockets to overcome an
                    892:                 * inadequacy of the UDP socket interface, but for backwards
                    893:                 * compatibility we avoid the problem here rather than
                    894:                 * fixing the interface.  Maybe 4.5BSD will remedy this?)
                    895:                 */
                    896:
                    897:                /*
1.92      itojun    898:                 * KAME note: traditionally we dropped udpiphdr from mbuf here.
1.71      itojun    899:                 * we need udpiphdr for IPsec processing so we do that later.
1.53      itojun    900:                 */
                    901:                /*
                    902:                 * Locate pcb(s) for datagram.
                    903:                 */
1.109     itojun    904:                CIRCLEQ_FOREACH(inph, &udbtable.inpt_queue, inph_queue) {
                    905:                        in6p = (struct in6pcb *)inph;
                    906:                        if (in6p->in6p_af != AF_INET6)
                    907:                                continue;
                    908:
1.79      itojun    909:                        if (in6p->in6p_lport != dport)
1.53      itojun    910:                                continue;
                    911:                        if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) {
1.146     rpaulo    912:                                if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr,
                    913:                                    dst6))
1.53      itojun    914:                                        continue;
1.92      itojun    915:                        } else {
1.146     rpaulo    916:                                if (IN6_IS_ADDR_V4MAPPED(dst6) &&
1.85      itojun    917:                                    (in6p->in6p_flags & IN6P_IPV6_V6ONLY))
1.55      itojun    918:                                        continue;
                    919:                        }
1.53      itojun    920:                        if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
1.79      itojun    921:                                if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr,
                    922:                                    &src6) || in6p->in6p_fport != sport)
1.53      itojun    923:                                        continue;
1.92      itojun    924:                        } else {
1.79      itojun    925:                                if (IN6_IS_ADDR_V4MAPPED(&src6) &&
1.85      itojun    926:                                    (in6p->in6p_flags & IN6P_IPV6_V6ONLY))
1.55      itojun    927:                                        continue;
                    928:                        }
1.53      itojun    929:
                    930:                        udp6_sendup(m, off, (struct sockaddr *)src,
                    931:                                in6p->in6p_socket);
                    932:                        rcvcnt++;
                    933:
                    934:                        /*
                    935:                         * Don't look for additional matches if this one does
                    936:                         * not have either the SO_REUSEPORT or SO_REUSEADDR
                    937:                         * socket options set.  This heuristic avoids searching
                    938:                         * through all pcbs in the common case of a non-shared
                    939:                         * port.  It assumes that an application will never
                    940:                         * clear these options after setting them.
                    941:                         */
                    942:                        if ((in6p->in6p_socket->so_options &
                    943:                            (SO_REUSEPORT|SO_REUSEADDR)) == 0)
                    944:                                break;
                    945:                }
                    946:        } else {
                    947:                /*
                    948:                 * Locate pcb for datagram.
                    949:                 */
1.146     rpaulo    950:                in6p = in6_pcblookup_connect(&udbtable, &src6, sport, dst6,
                    951:                    dport, 0);
1.53      itojun    952:                if (in6p == 0) {
1.166     thorpej   953:                        UDP_STATINC(UDP_STAT_PCBHASHMISS);
1.146     rpaulo    954:                        in6p = in6_pcblookup_bind(&udbtable, dst6, dport, 0);
1.82      itojun    955:                        if (in6p == 0)
1.53      itojun    956:                                return rcvcnt;
                    957:                }
                    958:
                    959:                udp6_sendup(m, off, (struct sockaddr *)src, in6p->in6p_socket);
                    960:                rcvcnt++;
                    961:        }
                    962:
                    963: bad:
                    964:        return rcvcnt;
                    965: }
                    966: #endif
1.1       cgd       967:
1.72      itojun    968: #ifdef INET
1.1       cgd       969: /*
                    970:  * Notify a udp user of an asynchronous error;
                    971:  * just wake up so that he can collect error status.
                    972:  */
1.7       mycroft   973: static void
1.119     matt      974: udp_notify(struct inpcb *inp, int errno)
1.1       cgd       975: {
                    976:        inp->inp_socket->so_error = errno;
                    977:        sorwakeup(inp->inp_socket);
                    978:        sowwakeup(inp->inp_socket);
                    979: }
                    980:
1.27      christos  981: void *
1.157     dyoung    982: udp_ctlinput(int cmd, const struct sockaddr *sa, void *v)
1.1       cgd       983: {
1.66      augustss  984:        struct ip *ip = v;
                    985:        struct udphdr *uh;
1.119     matt      986:        void (*notify)(struct inpcb *, int) = udp_notify;
1.21      mycroft   987:        int errno;
1.1       cgd       988:
1.53      itojun    989:        if (sa->sa_family != AF_INET
                    990:         || sa->sa_len != sizeof(struct sockaddr_in))
1.51      itojun    991:                return NULL;
1.20      mycroft   992:        if ((unsigned)cmd >= PRC_NCMDS)
1.27      christos  993:                return NULL;
1.20      mycroft   994:        errno = inetctlerrmap[cmd];
1.18      mycroft   995:        if (PRC_IS_REDIRECT(cmd))
1.19      mycroft   996:                notify = in_rtchange, ip = 0;
1.18      mycroft   997:        else if (cmd == PRC_HOSTDEAD)
1.19      mycroft   998:                ip = 0;
1.23      cgd       999:        else if (errno == 0)
1.27      christos 1000:                return NULL;
1.19      mycroft  1001:        if (ip) {
1.158     christos 1002:                uh = (struct udphdr *)((char *)ip + (ip->ip_hl << 2));
1.157     dyoung   1003:                in_pcbnotify(&udbtable, satocsin(sa)->sin_addr, uh->uh_dport,
1.34      mycroft  1004:                    ip->ip_src, uh->uh_sport, errno, notify);
1.53      itojun   1005:
                   1006:                /* XXX mapped address case */
1.19      mycroft  1007:        } else
1.157     dyoung   1008:                in_pcbnotifyall(&udbtable, satocsin(sa)->sin_addr, errno,
1.34      mycroft  1009:                    notify);
1.27      christos 1010:        return NULL;
1.1       cgd      1011: }
                   1012:
1.7       mycroft  1013: int
1.173     plunky   1014: udp_ctloutput(int op, struct socket *so, struct sockopt *sopt)
1.130     manu     1015: {
                   1016:        int s;
                   1017:        int error = 0;
                   1018:        struct inpcb *inp;
                   1019:        int family;
1.173     plunky   1020:        int optval;
1.130     manu     1021:
                   1022:        family = so->so_proto->pr_domain->dom_family;
                   1023:
                   1024:        s = splsoftnet();
                   1025:        switch (family) {
                   1026: #ifdef INET
                   1027:        case PF_INET:
1.173     plunky   1028:                if (sopt->sopt_level != IPPROTO_UDP) {
                   1029:                        error = ip_ctloutput(op, so, sopt);
1.130     manu     1030:                        goto end;
                   1031:                }
                   1032:                break;
                   1033: #endif
                   1034: #ifdef INET6
                   1035:        case PF_INET6:
1.173     plunky   1036:                if (sopt->sopt_level != IPPROTO_UDP) {
                   1037:                        error = ip6_ctloutput(op, so, sopt);
1.130     manu     1038:                        goto end;
                   1039:                }
                   1040:                break;
                   1041: #endif
                   1042:        default:
                   1043:                error = EAFNOSUPPORT;
                   1044:                goto end;
                   1045:        }
                   1046:
                   1047:
                   1048:        switch (op) {
                   1049:        case PRCO_SETOPT:
                   1050:                inp = sotoinpcb(so);
                   1051:
1.173     plunky   1052:                switch (sopt->sopt_name) {
1.130     manu     1053:                case UDP_ENCAP:
1.173     plunky   1054:                        error = sockopt_getint(sopt, &optval);
                   1055:                        if (error)
1.153     yamt     1056:                                break;
1.131     perry    1057:
1.173     plunky   1058:                        switch(optval) {
1.130     manu     1059: #ifdef IPSEC_NAT_T
                   1060:                        case 0:
                   1061:                                inp->inp_flags &= ~INP_ESPINUDP_ALL;
                   1062:                                break;
                   1063:
                   1064:                        case UDP_ENCAP_ESPINUDP:
                   1065:                                inp->inp_flags &= ~INP_ESPINUDP_ALL;
                   1066:                                inp->inp_flags |= INP_ESPINUDP;
                   1067:                                break;
1.131     perry    1068:
1.130     manu     1069:                        case UDP_ENCAP_ESPINUDP_NON_IKE:
                   1070:                                inp->inp_flags &= ~INP_ESPINUDP_ALL;
                   1071:                                inp->inp_flags |= INP_ESPINUDP_NON_IKE;
                   1072:                                break;
                   1073: #endif
                   1074:                        default:
                   1075:                                error = EINVAL;
                   1076:                                break;
                   1077:                        }
                   1078:                        break;
                   1079:
                   1080:                default:
                   1081:                        error = ENOPROTOOPT;
                   1082:                        break;
                   1083:                }
                   1084:                break;
                   1085:
                   1086:        default:
                   1087:                error = EINVAL;
                   1088:                break;
1.131     perry    1089:        }
                   1090:
1.130     manu     1091: end:
                   1092:        splx(s);
                   1093:        return error;
                   1094: }
1.131     perry    1095:
1.130     manu     1096:
                   1097: int
1.27      christos 1098: udp_output(struct mbuf *m, ...)
                   1099: {
1.66      augustss 1100:        struct inpcb *inp;
                   1101:        struct udpiphdr *ui;
1.125     thorpej  1102:        struct route *ro;
1.66      augustss 1103:        int len = m->m_pkthdr.len;
1.31      mycroft  1104:        int error = 0;
1.27      christos 1105:        va_list ap;
                   1106:
1.98      matt     1107:        MCLAIM(m, &udp_tx_mowner);
1.27      christos 1108:        va_start(ap, m);
                   1109:        inp = va_arg(ap, struct inpcb *);
                   1110:        va_end(ap);
1.1       cgd      1111:
                   1112:        /*
                   1113:         * Calculate data length and get a mbuf
                   1114:         * for UDP and IP headers.
                   1115:         */
1.13      mycroft  1116:        M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT);
                   1117:        if (m == 0) {
                   1118:                error = ENOBUFS;
1.39      thorpej  1119:                goto release;
                   1120:        }
                   1121:
                   1122:        /*
                   1123:         * Compute the packet length of the IP header, and
                   1124:         * punt if the length looks bogus.
                   1125:         */
1.96      itojun   1126:        if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) {
1.39      thorpej  1127:                error = EMSGSIZE;
1.13      mycroft  1128:                goto release;
                   1129:        }
1.1       cgd      1130:
                   1131:        /*
                   1132:         * Fill in mbuf with extended UDP header
                   1133:         * and addresses and length put into network format.
                   1134:         */
                   1135:        ui = mtod(m, struct udpiphdr *);
                   1136:        ui->ui_pr = IPPROTO_UDP;
                   1137:        ui->ui_src = inp->inp_laddr;
                   1138:        ui->ui_dst = inp->inp_faddr;
                   1139:        ui->ui_sport = inp->inp_lport;
                   1140:        ui->ui_dport = inp->inp_fport;
1.78      thorpej  1141:        ui->ui_ulen = htons((u_int16_t)len + sizeof(struct udphdr));
1.1       cgd      1142:
1.125     thorpej  1143:        ro = &inp->inp_route;
                   1144:
1.1       cgd      1145:        /*
1.78      thorpej  1146:         * Set up checksum and output datagram.
1.1       cgd      1147:         */
                   1148:        if (udpcksum) {
1.78      thorpej  1149:                /*
                   1150:                 * XXX Cache pseudo-header checksum part for
                   1151:                 * XXX "connected" UDP sockets.
                   1152:                 */
                   1153:                ui->ui_sum = in_cksum_phdr(ui->ui_src.s_addr,
                   1154:                    ui->ui_dst.s_addr, htons((u_int16_t)len +
                   1155:                    sizeof(struct udphdr) + IPPROTO_UDP));
1.135     yamt     1156:                m->m_pkthdr.csum_flags = M_CSUM_UDPv4;
1.78      thorpej  1157:                m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
                   1158:        } else
                   1159:                ui->ui_sum = 0;
1.96      itojun   1160:        ((struct ip *)ui)->ip_len = htons(sizeof (struct udpiphdr) + len);
1.1       cgd      1161:        ((struct ip *)ui)->ip_ttl = inp->inp_ip.ip_ttl; /* XXX */
                   1162:        ((struct ip *)ui)->ip_tos = inp->inp_ip.ip_tos; /* XXX */
1.166     thorpej  1163:        UDP_STATINC(UDP_STAT_OPACKETS);
1.48      itojun   1164:
1.125     thorpej  1165:        return (ip_output(m, inp->inp_options, ro,
1.12      mycroft  1166:            inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST),
1.107     itojun   1167:            inp->inp_moptions, inp->inp_socket));
1.1       cgd      1168:
                   1169: release:
                   1170:        m_freem(m);
                   1171:        return (error);
                   1172: }
                   1173:
1.42      thorpej  1174: int    udp_sendspace = 9216;           /* really max datagram size */
                   1175: int    udp_recvspace = 40 * (1024 + sizeof(struct sockaddr_in));
1.1       cgd      1176:                                        /* 40 1K datagrams */
                   1177:
                   1178: /*ARGSUSED*/
1.7       mycroft  1179: int
1.119     matt     1180: udp_usrreq(struct socket *so, int req, struct mbuf *m, struct mbuf *nam,
1.145     christos 1181:        struct mbuf *control, struct lwp *l)
1.1       cgd      1182: {
1.66      augustss 1183:        struct inpcb *inp;
1.1       cgd      1184:        int s;
1.66      augustss 1185:        int error = 0;
1.1       cgd      1186:
                   1187:        if (req == PRU_CONTROL)
1.158     christos 1188:                return (in_control(so, (long)m, (void *)nam,
1.148     ad       1189:                    (struct ifnet *)control, l));
1.59      thorpej  1190:
1.149     tls      1191:        s = splsoftnet();
                   1192:
1.60      thorpej  1193:        if (req == PRU_PURGEIF) {
1.170     ad       1194:                mutex_enter(softnet_lock);
1.80      itojun   1195:                in_pcbpurgeif0(&udbtable, (struct ifnet *)control);
1.60      thorpej  1196:                in_purgeif((struct ifnet *)control);
                   1197:                in_pcbpurgeif(&udbtable, (struct ifnet *)control);
1.170     ad       1198:                mutex_exit(softnet_lock);
1.149     tls      1199:                splx(s);
1.59      thorpej  1200:                return (0);
                   1201:        }
1.31      mycroft  1202:
                   1203:        inp = sotoinpcb(so);
1.32      mycroft  1204: #ifdef DIAGNOSTIC
                   1205:        if (req != PRU_SEND && req != PRU_SENDOOB && control)
                   1206:                panic("udp_usrreq: unexpected control mbuf");
                   1207: #endif
1.170     ad       1208:        if (req == PRU_ATTACH) {
                   1209:                sosetlock(so);
                   1210:        } else if (inp == 0) {
1.31      mycroft  1211:                error = EINVAL;
                   1212:                goto release;
                   1213:        }
                   1214:
1.1       cgd      1215:        /*
                   1216:         * Note: need to block udp_input while changing
                   1217:         * the udp pcb queue and/or pcb addresses.
                   1218:         */
                   1219:        switch (req) {
                   1220:
                   1221:        case PRU_ATTACH:
1.31      mycroft  1222:                if (inp != 0) {
                   1223:                        error = EISCONN;
1.1       cgd      1224:                        break;
                   1225:                }
1.98      matt     1226: #ifdef MBUFTRACE
                   1227:                so->so_mowner = &udp_mowner;
                   1228:                so->so_rcv.sb_mowner = &udp_rx_mowner;
                   1229:                so->so_snd.sb_mowner = &udp_tx_mowner;
                   1230: #endif
1.31      mycroft  1231:                if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
                   1232:                        error = soreserve(so, udp_sendspace, udp_recvspace);
                   1233:                        if (error)
                   1234:                                break;
                   1235:                }
1.18      mycroft  1236:                error = in_pcballoc(so, &udbtable);
1.1       cgd      1237:                if (error)
                   1238:                        break;
1.31      mycroft  1239:                inp = sotoinpcb(so);
                   1240:                inp->inp_ip.ip_ttl = ip_defttl;
1.1       cgd      1241:                break;
                   1242:
                   1243:        case PRU_DETACH:
1.31      mycroft  1244:                in_pcbdetach(inp);
1.1       cgd      1245:                break;
                   1246:
                   1247:        case PRU_BIND:
1.148     ad       1248:                error = in_pcbbind(inp, nam, l);
1.1       cgd      1249:                break;
                   1250:
                   1251:        case PRU_LISTEN:
                   1252:                error = EOPNOTSUPP;
                   1253:                break;
                   1254:
                   1255:        case PRU_CONNECT:
1.148     ad       1256:                error = in_pcbconnect(inp, nam, l);
1.31      mycroft  1257:                if (error)
1.1       cgd      1258:                        break;
1.31      mycroft  1259:                soisconnected(so);
1.1       cgd      1260:                break;
                   1261:
                   1262:        case PRU_CONNECT2:
                   1263:                error = EOPNOTSUPP;
                   1264:                break;
                   1265:
                   1266:        case PRU_DISCONNECT:
1.31      mycroft  1267:                /*soisdisconnected(so);*/
                   1268:                so->so_state &= ~SS_ISCONNECTED;        /* XXX */
1.1       cgd      1269:                in_pcbdisconnect(inp);
1.34      mycroft  1270:                inp->inp_laddr = zeroin_addr;           /* XXX */
1.35      mycroft  1271:                in_pcbstate(inp, INP_BOUND);            /* XXX */
1.1       cgd      1272:                break;
                   1273:
                   1274:        case PRU_SHUTDOWN:
                   1275:                socantsendmore(so);
                   1276:                break;
                   1277:
1.31      mycroft  1278:        case PRU_RCVD:
                   1279:                error = EOPNOTSUPP;
1.1       cgd      1280:                break;
                   1281:
1.31      mycroft  1282:        case PRU_SEND:
1.32      mycroft  1283:                if (control && control->m_len) {
                   1284:                        m_freem(control);
                   1285:                        m_freem(m);
                   1286:                        error = EINVAL;
                   1287:                        break;
                   1288:                }
1.31      mycroft  1289:        {
1.35      mycroft  1290:                struct in_addr laddr;                   /* XXX */
1.1       cgd      1291:
1.31      mycroft  1292:                if (nam) {
1.35      mycroft  1293:                        laddr = inp->inp_laddr;         /* XXX */
1.31      mycroft  1294:                        if ((so->so_state & SS_ISCONNECTED) != 0) {
                   1295:                                error = EISCONN;
1.32      mycroft  1296:                                goto die;
1.31      mycroft  1297:                        }
1.148     ad       1298:                        error = in_pcbconnect(inp, nam, l);
1.100     matt     1299:                        if (error)
                   1300:                                goto die;
1.31      mycroft  1301:                } else {
                   1302:                        if ((so->so_state & SS_ISCONNECTED) == 0) {
                   1303:                                error = ENOTCONN;
1.32      mycroft  1304:                                goto die;
1.31      mycroft  1305:                        }
                   1306:                }
1.33      mycroft  1307:                error = udp_output(m, inp);
1.100     matt     1308:                m = NULL;
1.31      mycroft  1309:                if (nam) {
                   1310:                        in_pcbdisconnect(inp);
1.35      mycroft  1311:                        inp->inp_laddr = laddr;         /* XXX */
                   1312:                        in_pcbstate(inp, INP_BOUND);    /* XXX */
1.31      mycroft  1313:                }
1.100     matt     1314:          die:
                   1315:                if (m)
                   1316:                        m_freem(m);
1.31      mycroft  1317:        }
1.1       cgd      1318:                break;
                   1319:
                   1320:        case PRU_SENSE:
                   1321:                /*
                   1322:                 * stat: don't bother with a blocksize.
                   1323:                 */
1.31      mycroft  1324:                splx(s);
1.1       cgd      1325:                return (0);
                   1326:
1.31      mycroft  1327:        case PRU_RCVOOB:
                   1328:                error =  EOPNOTSUPP;
                   1329:                break;
                   1330:
1.1       cgd      1331:        case PRU_SENDOOB:
1.32      mycroft  1332:                m_freem(control);
1.31      mycroft  1333:                m_freem(m);
1.1       cgd      1334:                error =  EOPNOTSUPP;
                   1335:                break;
                   1336:
1.31      mycroft  1337:        case PRU_SOCKADDR:
                   1338:                in_setsockaddr(inp, nam);
                   1339:                break;
                   1340:
                   1341:        case PRU_PEERADDR:
                   1342:                in_setpeeraddr(inp, nam);
                   1343:                break;
1.1       cgd      1344:
                   1345:        default:
                   1346:                panic("udp_usrreq");
                   1347:        }
                   1348:
                   1349: release:
1.31      mycroft  1350:        splx(s);
1.1       cgd      1351:        return (error);
1.13      mycroft  1352: }
                   1353:
1.166     thorpej  1354: static int
                   1355: sysctl_net_inet_udp_stats(SYSCTLFN_ARGS)
                   1356: {
                   1357:
1.172     thorpej  1358:        return (NETSTAT_SYSCTL(udpstat_percpu, UDP_NSTATS));
1.166     thorpej  1359: }
                   1360:
1.13      mycroft  1361: /*
                   1362:  * Sysctl for udp variables.
                   1363:  */
1.114     atatat   1364: SYSCTL_SETUP(sysctl_net_inet_udp_setup, "sysctl net.inet.udp subtree setup")
1.13      mycroft  1365: {
1.114     atatat   1366:
1.116     atatat   1367:        sysctl_createv(clog, 0, NULL, NULL,
                   1368:                       CTLFLAG_PERMANENT,
1.114     atatat   1369:                       CTLTYPE_NODE, "net", NULL,
                   1370:                       NULL, 0, NULL, 0,
                   1371:                       CTL_NET, CTL_EOL);
1.116     atatat   1372:        sysctl_createv(clog, 0, NULL, NULL,
                   1373:                       CTLFLAG_PERMANENT,
1.114     atatat   1374:                       CTLTYPE_NODE, "inet", NULL,
                   1375:                       NULL, 0, NULL, 0,
                   1376:                       CTL_NET, PF_INET, CTL_EOL);
1.116     atatat   1377:        sysctl_createv(clog, 0, NULL, NULL,
                   1378:                       CTLFLAG_PERMANENT,
1.122     atatat   1379:                       CTLTYPE_NODE, "udp",
                   1380:                       SYSCTL_DESCR("UDPv4 related settings"),
1.114     atatat   1381:                       NULL, 0, NULL, 0,
                   1382:                       CTL_NET, PF_INET, IPPROTO_UDP, CTL_EOL);
                   1383:
1.116     atatat   1384:        sysctl_createv(clog, 0, NULL, NULL,
                   1385:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.122     atatat   1386:                       CTLTYPE_INT, "checksum",
1.123     heas     1387:                       SYSCTL_DESCR("Compute UDP checksums"),
1.114     atatat   1388:                       NULL, 0, &udpcksum, 0,
                   1389:                       CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_CHECKSUM,
                   1390:                       CTL_EOL);
1.116     atatat   1391:        sysctl_createv(clog, 0, NULL, NULL,
                   1392:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.122     atatat   1393:                       CTLTYPE_INT, "sendspace",
                   1394:                       SYSCTL_DESCR("Default UDP send buffer size"),
1.114     atatat   1395:                       NULL, 0, &udp_sendspace, 0,
                   1396:                       CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_SENDSPACE,
                   1397:                       CTL_EOL);
1.116     atatat   1398:        sysctl_createv(clog, 0, NULL, NULL,
                   1399:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.122     atatat   1400:                       CTLTYPE_INT, "recvspace",
                   1401:                       SYSCTL_DESCR("Default UDP receive buffer size"),
1.114     atatat   1402:                       NULL, 0, &udp_recvspace, 0,
                   1403:                       CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_RECVSPACE,
                   1404:                       CTL_EOL);
1.125     thorpej  1405:        sysctl_createv(clog, 0, NULL, NULL,
                   1406:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1407:                       CTLTYPE_INT, "do_loopback_cksum",
                   1408:                       SYSCTL_DESCR("Perform UDP checksum on loopback"),
                   1409:                       NULL, 0, &udp_do_loopback_cksum, 0,
                   1410:                       CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_LOOPBACKCKSUM,
                   1411:                       CTL_EOL);
1.132     atatat   1412:        sysctl_createv(clog, 0, NULL, NULL,
                   1413:                       CTLFLAG_PERMANENT,
1.134     atatat   1414:                       CTLTYPE_STRUCT, "pcblist",
1.132     atatat   1415:                       SYSCTL_DESCR("UDP protocol control block list"),
                   1416:                       sysctl_inpcblist, 0, &udbtable, 0,
                   1417:                       CTL_NET, PF_INET, IPPROTO_UDP, CTL_CREATE,
                   1418:                       CTL_EOL);
1.139     elad     1419:        sysctl_createv(clog, 0, NULL, NULL,
                   1420:                       CTLFLAG_PERMANENT,
                   1421:                       CTLTYPE_STRUCT, "stats",
                   1422:                       SYSCTL_DESCR("UDP statistics"),
1.166     thorpej  1423:                       sysctl_net_inet_udp_stats, 0, NULL, 0,
1.139     elad     1424:                       CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_STATS,
                   1425:                       CTL_EOL);
1.1       cgd      1426: }
1.72      itojun   1427: #endif
1.130     manu     1428:
1.166     thorpej  1429: void
                   1430: udp_statinc(u_int stat)
                   1431: {
                   1432:
                   1433:        KASSERT(stat < UDP_NSTATS);
                   1434:        UDP_STATINC(stat);
                   1435: }
                   1436:
1.130     manu     1437: #if (defined INET && defined IPSEC_NAT_T)
                   1438: /*
                   1439:  * Returns:
                   1440:  * 1 if the packet was processed
                   1441:  * 0 if normal UDP processing should take place
1.144     manu     1442:  * -1 if an error occurent and m was freed
1.130     manu     1443:  */
                   1444: static int
1.154     yamt     1445: udp4_espinudp(struct mbuf **mp, int off, struct sockaddr *src,
1.151     christos 1446:     struct socket *so)
1.130     manu     1447: {
                   1448:        size_t len;
1.158     christos 1449:        void *data;
1.130     manu     1450:        struct inpcb *inp;
                   1451:        size_t skip = 0;
                   1452:        size_t minlen;
                   1453:        size_t iphdrlen;
                   1454:        struct ip *ip;
                   1455:        struct mbuf *n;
1.136     manu     1456:        struct m_tag *tag;
                   1457:        struct udphdr *udphdr;
                   1458:        u_int16_t sport, dport;
1.144     manu     1459:        struct mbuf *m = *mp;
1.130     manu     1460:
1.131     perry    1461:        /*
1.130     manu     1462:         * Collapse the mbuf chain if the first mbuf is too short
                   1463:         * The longest case is: UDP + non ESP marker + ESP
                   1464:         */
                   1465:        minlen = off + sizeof(u_int64_t) + sizeof(struct esp);
                   1466:        if (minlen > m->m_pkthdr.len)
                   1467:                minlen = m->m_pkthdr.len;
                   1468:
                   1469:        if (m->m_len < minlen) {
1.144     manu     1470:                if ((*mp = m_pullup(m, minlen)) == NULL) {
1.130     manu     1471:                        printf("udp4_espinudp: m_pullup failed\n");
1.144     manu     1472:                        return -1;
1.130     manu     1473:                }
1.144     manu     1474:                m = *mp;
1.130     manu     1475:        }
                   1476:
1.131     perry    1477:        len = m->m_len - off;
1.158     christos 1478:        data = mtod(m, char *) + off;
1.130     manu     1479:        inp = sotoinpcb(so);
                   1480:
                   1481:        /* Ignore keepalive packets */
1.158     christos 1482:        if ((len == 1) && (*(unsigned char *)data == 0xff)) {
1.130     manu     1483:                return 1;
                   1484:        }
                   1485:
1.131     perry    1486:        /*
                   1487:         * Check that the payload is long enough to hold
1.130     manu     1488:         * an ESP header and compute the length of encapsulation
1.131     perry    1489:         * header to remove
1.130     manu     1490:         */
                   1491:        if (inp->inp_flags & INP_ESPINUDP) {
                   1492:                u_int32_t *st = (u_int32_t *)data;
                   1493:
                   1494:                if ((len <= sizeof(struct esp)) || (*st == 0))
                   1495:                        return 0; /* Normal UDP processing */
                   1496:
                   1497:                skip = sizeof(struct udphdr);
                   1498:        }
                   1499:
                   1500:        if (inp->inp_flags & INP_ESPINUDP_NON_IKE) {
1.142     kleink   1501:                u_int32_t *st = (u_int32_t *)data;
1.130     manu     1502:
                   1503:                if ((len <= sizeof(u_int64_t) + sizeof(struct esp))
1.142     kleink   1504:                    || ((st[0] | st[1]) != 0))
1.130     manu     1505:                        return 0; /* Normal UDP processing */
1.131     perry    1506:
1.130     manu     1507:                skip = sizeof(struct udphdr) + sizeof(u_int64_t);
                   1508:        }
                   1509:
                   1510:        /*
1.136     manu     1511:         * Get the UDP ports. They are handled in network
                   1512:         * order everywhere in IPSEC_NAT_T code.
                   1513:         */
1.158     christos 1514:        udphdr = (struct udphdr *)((char *)data - skip);
1.136     manu     1515:        sport = udphdr->uh_sport;
                   1516:        dport = udphdr->uh_dport;
                   1517:
                   1518:        /*
1.130     manu     1519:         * Remove the UDP header (and possibly the non ESP marker)
                   1520:         * IP header lendth is iphdrlen
1.131     perry    1521:         * Before:
1.130     manu     1522:         *   <--- off --->
                   1523:         *   +----+------+-----+
                   1524:         *   | IP |  UDP | ESP |
                   1525:         *   +----+------+-----+
                   1526:         *        <-skip->
                   1527:         * After:
                   1528:         *          +----+-----+
                   1529:         *          | IP | ESP |
                   1530:         *          +----+-----+
                   1531:         *   <-skip->
                   1532:         */
                   1533:        iphdrlen = off - sizeof(struct udphdr);
1.158     christos 1534:        memmove(mtod(m, char *) + skip, mtod(m, void *), iphdrlen);
1.130     manu     1535:        m_adj(m, skip);
                   1536:
                   1537:        ip = mtod(m, struct ip *);
                   1538:        ip->ip_len = htons(ntohs(ip->ip_len) - skip);
                   1539:        ip->ip_p = IPPROTO_ESP;
                   1540:
                   1541:        /*
1.131     perry    1542:         * Copy the mbuf to avoid multiple free, as both
                   1543:         * esp4_input (which we call) and udp_input (which
1.130     manu     1544:         * called us) free the mbuf.
                   1545:         */
                   1546:        if ((n = m_dup(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
                   1547:                printf("udp4_espinudp: m_dup failed\n");
                   1548:                return 0;
                   1549:        }
                   1550:
1.136     manu     1551:        /*
                   1552:         * Add a PACKET_TAG_IPSEC_NAT_T_PORT tag to remember
                   1553:         * the source UDP port. This is required if we want
                   1554:         * to select the right SPD for multiple hosts behind
                   1555:         * same NAT
                   1556:         */
1.137     manu     1557:        if ((tag = m_tag_get(PACKET_TAG_IPSEC_NAT_T_PORTS,
                   1558:            sizeof(sport) + sizeof(dport), M_DONTWAIT)) == NULL) {
                   1559:                printf("udp4_espinudp: m_tag_get failed\n");
1.138     manu     1560:                m_freem(n);
1.137     manu     1561:                return 0;
                   1562:        }
1.136     manu     1563:        ((u_int16_t *)(tag + 1))[0] = sport;
                   1564:        ((u_int16_t *)(tag + 1))[1] = dport;
                   1565:        m_tag_prepend(n, tag);
                   1566:
1.147     christos 1567: #ifdef FAST_IPSEC
1.160     degroote 1568:        ipsec4_common_input(n, iphdrlen, IPPROTO_ESP);
1.147     christos 1569: #else
1.130     manu     1570:        esp4_input(n, iphdrlen);
1.147     christos 1571: #endif
1.130     manu     1572:
                   1573:        /* We handled it, it shoudln't be handled by UDP */
                   1574:        return 1;
                   1575: }
                   1576: #endif

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