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Annotation of src/sys/netinet/udp_usrreq.c, Revision 1.134.2.3

1.134.2.3! tron        1: /*     $NetBSD$        */
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>
1.134.2.3! tron       64: __KERNEL_RCSID(0, "$NetBSD$");
1.50      thorpej    65:
1.77      soda       66: #include "opt_inet.h"
1.50      thorpej    67: #include "opt_ipsec.h"
1.78      thorpej    68: #include "opt_inet_csum.h"
1.64      ws         69: #include "opt_ipkdb.h"
1.101     martin     70: #include "opt_mbuftrace.h"
1.1       cgd        71:
1.5       mycroft    72: #include <sys/param.h>
                     73: #include <sys/malloc.h>
                     74: #include <sys/mbuf.h>
                     75: #include <sys/protosw.h>
                     76: #include <sys/socket.h>
                     77: #include <sys/socketvar.h>
1.13      mycroft    78: #include <sys/errno.h>
1.5       mycroft    79: #include <sys/stat.h>
1.27      christos   80: #include <sys/systm.h>
                     81: #include <sys/proc.h>
1.53      itojun     82: #include <sys/domain.h>
1.27      christos   83: #include <sys/sysctl.h>
1.1       cgd        84:
1.5       mycroft    85: #include <net/if.h>
                     86: #include <net/route.h>
1.1       cgd        87:
1.5       mycroft    88: #include <netinet/in.h>
                     89: #include <netinet/in_systm.h>
1.15      cgd        90: #include <netinet/in_var.h>
1.5       mycroft    91: #include <netinet/ip.h>
                     92: #include <netinet/in_pcb.h>
                     93: #include <netinet/ip_var.h>
                     94: #include <netinet/ip_icmp.h>
                     95: #include <netinet/udp.h>
                     96: #include <netinet/udp_var.h>
1.1       cgd        97:
1.130     manu       98: #ifdef IPSEC_NAT_T
                     99: #include <netinet6/ipsec.h>
                    100: #include <netinet6/esp.h>
                    101: #endif
                    102:
1.53      itojun    103: #ifdef INET6
                    104: #include <netinet/ip6.h>
                    105: #include <netinet/icmp6.h>
                    106: #include <netinet6/ip6_var.h>
                    107: #include <netinet6/in6_pcb.h>
                    108: #include <netinet6/udp6_var.h>
                    109: #endif
                    110:
                    111: #ifndef INET6
                    112: /* always need ip6.h for IP6_EXTHDR_GET */
                    113: #include <netinet/ip6.h>
                    114: #endif
                    115:
1.76      itojun    116: #include "faith.h"
                    117: #if defined(NFAITH) && NFAITH > 0
                    118: #include <net/if_faith.h>
                    119: #endif
                    120:
1.27      christos  121: #include <machine/stdarg.h>
                    122:
1.105     jonathan  123: #ifdef FAST_IPSEC
                    124: #include <netipsec/ipsec.h>
1.121     jonathan  125: #include <netipsec/ipsec_var.h>                        /* XXX ipsecstat namespace */
1.105     jonathan  126: #ifdef INET6
                    127: #include <netipsec/ipsec6.h>
                    128: #endif
                    129: #endif /* FAST_IPSEC*/
                    130:
1.48      itojun    131: #ifdef IPSEC
                    132: #include <netinet6/ipsec.h>
                    133: #include <netkey/key.h>
                    134: #endif /*IPSEC*/
                    135:
1.64      ws        136: #ifdef IPKDB
                    137: #include <ipkdb/ipkdb.h>
                    138: #endif
                    139:
1.8       mycroft   140: /*
                    141:  * UDP protocol implementation.
                    142:  * Per RFC 768, August, 1980.
                    143:  */
                    144: #ifndef        COMPAT_42
                    145: int    udpcksum = 1;
                    146: #else
                    147: int    udpcksum = 0;           /* XXX */
                    148: #endif
1.128     christos  149: int    udp_do_loopback_cksum = 0;
1.93      matt      150:
                    151: struct inpcbtable udbtable;
                    152: struct udpstat udpstat;
1.8       mycroft   153:
1.72      itojun    154: #ifdef INET
1.130     manu      155: #ifdef IPSEC_NAT_T
                    156: static int udp4_espinudp (struct mbuf *, int, struct sockaddr *,
                    157:        struct socket *);
                    158: #endif
1.119     matt      159: static void udp4_sendup (struct mbuf *, int, struct sockaddr *,
                    160:        struct socket *);
                    161: static int udp4_realinput (struct sockaddr_in *, struct sockaddr_in *,
                    162:        struct mbuf *, int);
1.129     yamt      163: static int udp4_input_checksum(struct mbuf *, const struct udphdr *, int, int);
1.72      itojun    164: #endif
1.53      itojun    165: #ifdef INET6
1.119     matt      166: static void udp6_sendup (struct mbuf *, int, struct sockaddr *,
                    167:        struct socket *);
                    168: static int udp6_realinput (int, struct sockaddr_in6 *,
                    169:        struct sockaddr_in6 *, struct mbuf *, int);
1.129     yamt      170: static int udp6_input_checksum(struct mbuf *, const struct udphdr *, int, int);
1.53      itojun    171: #endif
1.72      itojun    172: #ifdef INET
1.119     matt      173: static void udp_notify (struct inpcb *, int);
1.72      itojun    174: #endif
1.7       mycroft   175:
1.26      mycroft   176: #ifndef UDBHASHSIZE
                    177: #define        UDBHASHSIZE     128
                    178: #endif
                    179: int    udbhashsize = UDBHASHSIZE;
                    180:
1.98      matt      181: #ifdef MBUFTRACE
                    182: struct mowner udp_mowner = { "udp" };
                    183: struct mowner udp_rx_mowner = { "udp", "rx" };
                    184: struct mowner udp_tx_mowner = { "udp", "tx" };
                    185: #endif
                    186:
1.78      thorpej   187: #ifdef UDP_CSUM_COUNTERS
                    188: #include <sys/device.h>
                    189:
                    190: struct evcnt udp_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    191:     NULL, "udp", "hwcsum bad");
                    192: struct evcnt udp_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    193:     NULL, "udp", "hwcsum ok");
                    194: struct evcnt udp_hwcsum_data = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    195:     NULL, "udp", "hwcsum data");
                    196: struct evcnt udp_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    197:     NULL, "udp", "swcsum");
                    198:
                    199: #define        UDP_CSUM_COUNTER_INCR(ev)       (ev)->ev_count++
                    200:
1.120     matt      201: EVCNT_ATTACH_STATIC(udp_hwcsum_bad);
                    202: EVCNT_ATTACH_STATIC(udp_hwcsum_ok);
                    203: EVCNT_ATTACH_STATIC(udp_hwcsum_data);
                    204: EVCNT_ATTACH_STATIC(udp_swcsum);
                    205:
1.78      thorpej   206: #else
                    207:
                    208: #define        UDP_CSUM_COUNTER_INCR(ev)       /* nothing */
                    209:
                    210: #endif /* UDP_CSUM_COUNTERS */
                    211:
1.7       mycroft   212: void
1.119     matt      213: udp_init(void)
1.1       cgd       214: {
1.18      mycroft   215:
1.35      mycroft   216:        in_pcbinit(&udbtable, udbhashsize, udbhashsize);
1.78      thorpej   217:
1.98      matt      218:        MOWNER_ATTACH(&udp_tx_mowner);
                    219:        MOWNER_ATTACH(&udp_rx_mowner);
                    220:        MOWNER_ATTACH(&udp_mowner);
1.1       cgd       221: }
                    222:
1.129     yamt      223: /*
                    224:  * Checksum extended UDP header and data.
                    225:  */
                    226:
                    227: int
                    228: udp_input_checksum(int af, struct mbuf *m, const struct udphdr *uh,
                    229:     int iphlen, int len)
                    230: {
                    231:
                    232:        switch (af) {
1.72      itojun    233: #ifdef INET
1.129     yamt      234:        case AF_INET:
                    235:                return udp4_input_checksum(m, uh, iphlen, len);
                    236: #endif
                    237: #ifdef INET6
                    238:        case AF_INET6:
                    239:                return udp6_input_checksum(m, uh, iphlen, len);
                    240: #endif
                    241:        }
                    242: #ifdef DIAGNOSTIC
                    243:        panic("udp_input_checksum: unknown af %d", af);
                    244: #endif
                    245:        /* NOTREACHED */
                    246:        return -1;
                    247: }
                    248:
                    249: #ifdef INET
                    250:
                    251: /*
                    252:  * Checksum extended UDP header and data.
                    253:  */
                    254:
                    255: static int
                    256: udp4_input_checksum(struct mbuf *m, const struct udphdr *uh,
                    257:     int iphlen, int len)
                    258: {
                    259:
                    260:        /*
                    261:         * XXX it's better to record and check if this mbuf is
                    262:         * already checked.
                    263:         */
                    264:
                    265:        if (uh->uh_sum == 0)
                    266:                return 0;
                    267:
                    268:        switch (m->m_pkthdr.csum_flags &
                    269:            ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_UDPv4) |
                    270:            M_CSUM_TCP_UDP_BAD | M_CSUM_DATA)) {
                    271:        case M_CSUM_UDPv4|M_CSUM_TCP_UDP_BAD:
                    272:                UDP_CSUM_COUNTER_INCR(&udp_hwcsum_bad);
                    273:                goto badcsum;
                    274:
                    275:        case M_CSUM_UDPv4|M_CSUM_DATA: {
                    276:                u_int32_t hw_csum = m->m_pkthdr.csum_data;
                    277:
                    278:                UDP_CSUM_COUNTER_INCR(&udp_hwcsum_data);
                    279:                if (m->m_pkthdr.csum_flags & M_CSUM_NO_PSEUDOHDR) {
                    280:                        const struct ip *ip =
                    281:                            mtod(m, const struct ip *);
                    282:
                    283:                        hw_csum = in_cksum_phdr(ip->ip_src.s_addr,
                    284:                            ip->ip_dst.s_addr,
                    285:                            htons(hw_csum + len + IPPROTO_UDP));
                    286:                }
                    287:                if ((hw_csum ^ 0xffff) != 0)
                    288:                        goto badcsum;
                    289:                break;
                    290:        }
                    291:
                    292:        case M_CSUM_UDPv4:
                    293:                /* Checksum was okay. */
                    294:                UDP_CSUM_COUNTER_INCR(&udp_hwcsum_ok);
                    295:                break;
                    296:
                    297:        default:
                    298:                /*
                    299:                 * Need to compute it ourselves.  Maybe skip checksum
                    300:                 * on loopback interfaces.
                    301:                 */
                    302:                if (__predict_true(!(m->m_pkthdr.rcvif->if_flags &
                    303:                                     IFF_LOOPBACK) ||
                    304:                                   udp_do_loopback_cksum)) {
                    305:                        UDP_CSUM_COUNTER_INCR(&udp_swcsum);
                    306:                        if (in4_cksum(m, IPPROTO_UDP, iphlen, len) != 0)
                    307:                                goto badcsum;
                    308:                }
                    309:                break;
                    310:        }
                    311:
                    312:        return 0;
                    313:
                    314: badcsum:
                    315:        udpstat.udps_badsum++;
                    316:        return -1;
                    317: }
                    318:
1.7       mycroft   319: void
1.27      christos  320: udp_input(struct mbuf *m, ...)
1.1       cgd       321: {
1.53      itojun    322:        va_list ap;
                    323:        struct sockaddr_in src, dst;
                    324:        struct ip *ip;
                    325:        struct udphdr *uh;
1.97      simonb    326:        int iphlen;
1.53      itojun    327:        int len;
                    328:        int n;
1.96      itojun    329:        u_int16_t ip_len;
1.53      itojun    330:
                    331:        va_start(ap, m);
                    332:        iphlen = va_arg(ap, int);
1.97      simonb    333:        (void)va_arg(ap, int);          /* ignore value, advance ap */
1.53      itojun    334:        va_end(ap);
                    335:
1.98      matt      336:        MCLAIM(m, &udp_rx_mowner);
1.53      itojun    337:        udpstat.udps_ipackets++;
                    338:
                    339:        /*
                    340:         * Get IP and UDP header together in first mbuf.
                    341:         */
                    342:        ip = mtod(m, struct ip *);
                    343:        IP6_EXTHDR_GET(uh, struct udphdr *, m, iphlen, sizeof(struct udphdr));
                    344:        if (uh == NULL) {
                    345:                udpstat.udps_hdrops++;
                    346:                return;
                    347:        }
1.95      thorpej   348:        KASSERT(UDP_HDR_ALIGNED_P(uh));
1.53      itojun    349:
1.57      itojun    350:        /* destination port of 0 is illegal, based on RFC768. */
                    351:        if (uh->uh_dport == 0)
                    352:                goto bad;
                    353:
1.53      itojun    354:        /*
                    355:         * Make mbuf data length reflect UDP length.
                    356:         * If not enough data to reflect UDP length, drop.
                    357:         */
1.96      itojun    358:        ip_len = ntohs(ip->ip_len);
1.53      itojun    359:        len = ntohs((u_int16_t)uh->uh_ulen);
1.96      itojun    360:        if (ip_len != iphlen + len) {
                    361:                if (ip_len < iphlen + len || len < sizeof(struct udphdr)) {
1.53      itojun    362:                        udpstat.udps_badlen++;
                    363:                        goto bad;
                    364:                }
1.96      itojun    365:                m_adj(m, iphlen + len - ip_len);
1.53      itojun    366:        }
                    367:
                    368:        /*
                    369:         * Checksum extended UDP header and data.
                    370:         */
1.129     yamt      371:        if (udp4_input_checksum(m, uh, iphlen, len))
                    372:                goto badcsum;
1.53      itojun    373:
                    374:        /* construct source and dst sockaddrs. */
                    375:        bzero(&src, sizeof(src));
                    376:        src.sin_family = AF_INET;
                    377:        src.sin_len = sizeof(struct sockaddr_in);
                    378:        bcopy(&ip->ip_src, &src.sin_addr, sizeof(src.sin_addr));
                    379:        src.sin_port = uh->uh_sport;
                    380:        bzero(&dst, sizeof(dst));
                    381:        dst.sin_family = AF_INET;
                    382:        dst.sin_len = sizeof(struct sockaddr_in);
                    383:        bcopy(&ip->ip_dst, &dst.sin_addr, sizeof(dst.sin_addr));
                    384:        dst.sin_port = uh->uh_dport;
                    385:
                    386:        n = udp4_realinput(&src, &dst, m, iphlen);
                    387: #ifdef INET6
                    388:        if (IN_MULTICAST(ip->ip_dst.s_addr) || n == 0) {
                    389:                struct sockaddr_in6 src6, dst6;
                    390:
                    391:                bzero(&src6, sizeof(src6));
                    392:                src6.sin6_family = AF_INET6;
                    393:                src6.sin6_len = sizeof(struct sockaddr_in6);
                    394:                src6.sin6_addr.s6_addr[10] = src6.sin6_addr.s6_addr[11] = 0xff;
                    395:                bcopy(&ip->ip_src, &src6.sin6_addr.s6_addr[12],
                    396:                        sizeof(ip->ip_src));
                    397:                src6.sin6_port = uh->uh_sport;
                    398:                bzero(&dst6, sizeof(dst6));
                    399:                dst6.sin6_family = AF_INET6;
                    400:                dst6.sin6_len = sizeof(struct sockaddr_in6);
                    401:                dst6.sin6_addr.s6_addr[10] = dst6.sin6_addr.s6_addr[11] = 0xff;
                    402:                bcopy(&ip->ip_dst, &dst6.sin6_addr.s6_addr[12],
                    403:                        sizeof(ip->ip_dst));
                    404:                dst6.sin6_port = uh->uh_dport;
                    405:
                    406:                n += udp6_realinput(AF_INET, &src6, &dst6, m, iphlen);
                    407:        }
                    408: #endif
                    409:
                    410:        if (n == 0) {
                    411:                if (m->m_flags & (M_BCAST | M_MCAST)) {
                    412:                        udpstat.udps_noportbcast++;
                    413:                        goto bad;
                    414:                }
1.61      itojun    415:                udpstat.udps_noport++;
1.64      ws        416: #ifdef IPKDB
1.53      itojun    417:                if (checkipkdb(&ip->ip_src, uh->uh_sport, uh->uh_dport,
                    418:                                m, iphlen + sizeof(struct udphdr),
                    419:                                m->m_pkthdr.len - iphlen - sizeof(struct udphdr))) {
                    420:                        /*
                    421:                         * It was a debugger connect packet,
                    422:                         * just drop it now
                    423:                         */
                    424:                        goto bad;
                    425:                }
                    426: #endif
                    427:                icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0);
                    428:                m = NULL;
                    429:        }
                    430:
                    431: bad:
                    432:        if (m)
                    433:                m_freem(m);
1.78      thorpej   434:        return;
                    435:
                    436: badcsum:
                    437:        m_freem(m);
1.53      itojun    438: }
1.72      itojun    439: #endif
1.53      itojun    440:
                    441: #ifdef INET6
1.129     yamt      442: static int
                    443: udp6_input_checksum(struct mbuf *m, const struct udphdr *uh, int off, int len)
                    444: {
                    445:
                    446:        if (__predict_false((m->m_flags & M_LOOP) && !udp_do_loopback_cksum)) {
                    447:                goto good;
                    448:        }
                    449:        if (uh->uh_sum == 0) {
                    450:                udp6stat.udp6s_nosum++;
                    451:                goto bad;
                    452:        }
                    453:        if (in6_cksum(m, IPPROTO_UDP, off, len) != 0) {
                    454:                udp6stat.udp6s_badsum++;
                    455:                goto bad;
                    456:        }
                    457:
                    458: good:
                    459:        return 0;
                    460: bad:
                    461:        return -1;
                    462: }
                    463:
1.53      itojun    464: int
1.119     matt      465: udp6_input(struct mbuf **mp, int *offp, int proto)
1.53      itojun    466: {
                    467:        struct mbuf *m = *mp;
                    468:        int off = *offp;
                    469:        struct sockaddr_in6 src, dst;
                    470:        struct ip6_hdr *ip6;
                    471:        struct udphdr *uh;
                    472:        u_int32_t plen, ulen;
                    473:
1.76      itojun    474:        ip6 = mtod(m, struct ip6_hdr *);
                    475:
1.53      itojun    476: #if defined(NFAITH) && 0 < NFAITH
1.76      itojun    477:        if (faithprefix(&ip6->ip6_dst)) {
                    478:                /* send icmp6 host unreach? */
                    479:                m_freem(m);
                    480:                return IPPROTO_DONE;
1.53      itojun    481:        }
                    482: #endif
                    483:
                    484:        udp6stat.udp6s_ipackets++;
                    485:
                    486:        /* check for jumbogram is done in ip6_input.  we can trust pkthdr.len */
                    487:        plen = m->m_pkthdr.len - off;
                    488:        IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(struct udphdr));
                    489:        if (uh == NULL) {
                    490:                ip6stat.ip6s_tooshort++;
                    491:                return IPPROTO_DONE;
                    492:        }
1.95      thorpej   493:        KASSERT(UDP_HDR_ALIGNED_P(uh));
1.53      itojun    494:        ulen = ntohs((u_short)uh->uh_ulen);
1.69      itojun    495:        /*
                    496:         * RFC2675 section 4: jumbograms will have 0 in the UDP header field,
                    497:         * iff payload length > 0xffff.
                    498:         */
1.53      itojun    499:        if (ulen == 0 && plen > 0xffff)
                    500:                ulen = plen;
                    501:
                    502:        if (plen != ulen) {
                    503:                udp6stat.udp6s_badlen++;
1.54      itojun    504:                goto bad;
                    505:        }
                    506:
1.57      itojun    507:        /* destination port of 0 is illegal, based on RFC768. */
                    508:        if (uh->uh_dport == 0)
                    509:                goto bad;
                    510:
1.54      itojun    511:        /* Be proactive about malicious use of IPv4 mapped address */
                    512:        if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
                    513:            IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
                    514:                /* XXX stat */
1.53      itojun    515:                goto bad;
                    516:        }
                    517:
                    518:        /*
1.125     thorpej   519:         * Checksum extended UDP header and data.  Maybe skip checksum
                    520:         * on loopback interfaces.
1.53      itojun    521:         */
1.129     yamt      522:        if (udp6_input_checksum(m, uh, off, ulen))
                    523:                goto bad;
1.53      itojun    524:
                    525:        /*
                    526:         * Construct source and dst sockaddrs.
                    527:         * Note that ifindex (s6_addr16[1]) is already filled.
                    528:         */
                    529:        bzero(&src, sizeof(src));
                    530:        src.sin6_family = AF_INET6;
                    531:        src.sin6_len = sizeof(struct sockaddr_in6);
1.69      itojun    532:        /* KAME hack: recover scopeid */
                    533:        (void)in6_recoverscope(&src, &ip6->ip6_src, m->m_pkthdr.rcvif);
1.53      itojun    534:        src.sin6_port = uh->uh_sport;
                    535:        bzero(&dst, sizeof(dst));
                    536:        dst.sin6_family = AF_INET6;
                    537:        dst.sin6_len = sizeof(struct sockaddr_in6);
1.69      itojun    538:        /* KAME hack: recover scopeid */
                    539:        (void)in6_recoverscope(&dst, &ip6->ip6_dst, m->m_pkthdr.rcvif);
1.53      itojun    540:        dst.sin6_port = uh->uh_dport;
                    541:
                    542:        if (udp6_realinput(AF_INET6, &src, &dst, m, off) == 0) {
                    543:                if (m->m_flags & M_MCAST) {
                    544:                        udp6stat.udp6s_noportmcast++;
                    545:                        goto bad;
                    546:                }
1.61      itojun    547:                udp6stat.udp6s_noport++;
1.53      itojun    548:                icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
                    549:                m = NULL;
                    550:        }
                    551:
                    552: bad:
                    553:        if (m)
                    554:                m_freem(m);
                    555:        return IPPROTO_DONE;
                    556: }
                    557: #endif
                    558:
1.72      itojun    559: #ifdef INET
1.53      itojun    560: static void
1.119     matt      561: udp4_sendup(struct mbuf *m, int off /* offset of data portion */,
                    562:        struct sockaddr *src, struct socket *so)
1.53      itojun    563: {
                    564:        struct mbuf *opts = NULL;
                    565:        struct mbuf *n;
                    566:        struct inpcb *inp = NULL;
                    567:
                    568:        if (!so)
                    569:                return;
                    570:        switch (so->so_proto->pr_domain->dom_family) {
                    571:        case AF_INET:
                    572:                inp = sotoinpcb(so);
                    573:                break;
                    574: #ifdef INET6
                    575:        case AF_INET6:
                    576:                break;
                    577: #endif
                    578:        default:
                    579:                return;
                    580:        }
                    581:
1.105     jonathan  582: #if defined(IPSEC) || defined(FAST_IPSEC)
1.53      itojun    583:        /* check AH/ESP integrity. */
                    584:        if (so != NULL && ipsec4_in_reject_so(m, so)) {
                    585:                ipsecstat.in_polvio++;
1.110     itojun    586:                if ((n = m_copy(m, 0, M_COPYALL)) != NULL)
                    587:                        icmp_error(n, ICMP_UNREACH, ICMP_UNREACH_ADMIN_PROHIBIT,
                    588:                            0, 0);
1.53      itojun    589:                return;
                    590:        }
                    591: #endif /*IPSEC*/
                    592:
                    593:        if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
                    594:                if (inp && (inp->inp_flags & INP_CONTROLOPTS
                    595:                         || so->so_options & SO_TIMESTAMP)) {
                    596:                        struct ip *ip = mtod(n, struct ip *);
                    597:                        ip_savecontrol(inp, &opts, ip, n);
                    598:                }
                    599:
                    600:                m_adj(n, off);
                    601:                if (sbappendaddr(&so->so_rcv, src, n,
                    602:                                opts) == 0) {
                    603:                        m_freem(n);
                    604:                        if (opts)
                    605:                                m_freem(opts);
1.124     darrenr   606:                        so->so_rcv.sb_overflowed++;
1.81      enami     607:                        udpstat.udps_fullsock++;
1.53      itojun    608:                } else
                    609:                        sorwakeup(so);
                    610:        }
                    611: }
1.72      itojun    612: #endif
1.53      itojun    613:
                    614: #ifdef INET6
                    615: static void
1.119     matt      616: udp6_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 in6pcb *in6p = NULL;
                    622:
                    623:        if (!so)
                    624:                return;
                    625:        if (so->so_proto->pr_domain->dom_family != AF_INET6)
                    626:                return;
                    627:        in6p = sotoin6pcb(so);
                    628:
1.105     jonathan  629: #if defined(IPSEC) || defined(FAST_IPSEC)
1.53      itojun    630:        /* check AH/ESP integrity. */
                    631:        if (so != NULL && ipsec6_in_reject_so(m, so)) {
                    632:                ipsec6stat.in_polvio++;
1.111     mycroft   633:                if ((n = m_copy(m, 0, M_COPYALL)) != NULL)
1.110     itojun    634:                        icmp6_error(n, ICMP6_DST_UNREACH,
                    635:                            ICMP6_DST_UNREACH_ADMIN, 0);
1.53      itojun    636:                return;
                    637:        }
                    638: #endif /*IPSEC*/
                    639:
                    640:        if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
                    641:                if (in6p && (in6p->in6p_flags & IN6P_CONTROLOPTS
                    642:                          || in6p->in6p_socket->so_options & SO_TIMESTAMP)) {
                    643:                        struct ip6_hdr *ip6 = mtod(n, struct ip6_hdr *);
                    644:                        ip6_savecontrol(in6p, &opts, ip6, n);
                    645:                }
                    646:
                    647:                m_adj(n, off);
                    648:                if (sbappendaddr(&so->so_rcv, src, n, opts) == 0) {
                    649:                        m_freem(n);
                    650:                        if (opts)
                    651:                                m_freem(opts);
1.124     darrenr   652:                        so->so_rcv.sb_overflowed++;
1.53      itojun    653:                        udp6stat.udp6s_fullsock++;
                    654:                } else
                    655:                        sorwakeup(so);
                    656:        }
                    657: }
                    658: #endif
                    659:
1.72      itojun    660: #ifdef INET
1.53      itojun    661: static int
1.119     matt      662: udp4_realinput(struct sockaddr_in *src, struct sockaddr_in *dst,
                    663:        struct mbuf *m, int off /* offset of udphdr */)
1.53      itojun    664: {
                    665:        u_int16_t *sport, *dport;
                    666:        int rcvcnt;
                    667:        struct in_addr *src4, *dst4;
1.109     itojun    668:        struct inpcb_hdr *inph;
1.53      itojun    669:        struct inpcb *inp;
                    670:
                    671:        rcvcnt = 0;
                    672:        off += sizeof(struct udphdr);   /* now, offset of payload */
                    673:
                    674:        if (src->sin_family != AF_INET || dst->sin_family != AF_INET)
                    675:                goto bad;
                    676:
                    677:        src4 = &src->sin_addr;
                    678:        sport = &src->sin_port;
                    679:        dst4 = &dst->sin_addr;
                    680:        dport = &dst->sin_port;
                    681:
1.73      itojun    682:        if (IN_MULTICAST(dst4->s_addr) ||
1.53      itojun    683:            in_broadcast(*dst4, m->m_pkthdr.rcvif)) {
                    684:                /*
                    685:                 * Deliver a multicast or broadcast datagram to *all* sockets
                    686:                 * for which the local and remote addresses and ports match
                    687:                 * those of the incoming datagram.  This allows more than
                    688:                 * one process to receive multi/broadcasts on the same port.
                    689:                 * (This really ought to be done for unicast datagrams as
                    690:                 * well, but that would cause problems with existing
                    691:                 * applications that open both address-specific sockets and
                    692:                 * a wildcard socket listening to the same port -- they would
                    693:                 * end up receiving duplicates of every unicast datagram.
                    694:                 * Those applications open the multiple sockets to overcome an
                    695:                 * inadequacy of the UDP socket interface, but for backwards
                    696:                 * compatibility we avoid the problem here rather than
                    697:                 * fixing the interface.  Maybe 4.5BSD will remedy this?)
                    698:                 */
                    699:
                    700:                /*
1.92      itojun    701:                 * KAME note: traditionally we dropped udpiphdr from mbuf here.
1.71      itojun    702:                 * we need udpiphdr for IPsec processing so we do that later.
1.53      itojun    703:                 */
                    704:                /*
                    705:                 * Locate pcb(s) for datagram.
                    706:                 */
1.109     itojun    707:                CIRCLEQ_FOREACH(inph, &udbtable.inpt_queue, inph_queue) {
                    708:                        inp = (struct inpcb *)inph;
                    709:                        if (inp->inp_af != AF_INET)
                    710:                                continue;
                    711:
1.53      itojun    712:                        if (inp->inp_lport != *dport)
                    713:                                continue;
                    714:                        if (!in_nullhost(inp->inp_laddr)) {
                    715:                                if (!in_hosteq(inp->inp_laddr, *dst4))
                    716:                                        continue;
                    717:                        }
                    718:                        if (!in_nullhost(inp->inp_faddr)) {
                    719:                                if (!in_hosteq(inp->inp_faddr, *src4) ||
                    720:                                    inp->inp_fport != *sport)
                    721:                                        continue;
                    722:                        }
                    723:
                    724:                        udp4_sendup(m, off, (struct sockaddr *)src,
                    725:                                inp->inp_socket);
                    726:                        rcvcnt++;
                    727:
                    728:                        /*
                    729:                         * Don't look for additional matches if this one does
                    730:                         * not have either the SO_REUSEPORT or SO_REUSEADDR
                    731:                         * socket options set.  This heuristic avoids searching
                    732:                         * through all pcbs in the common case of a non-shared
                    733:                         * port.  It assumes that an application will never
                    734:                         * clear these options after setting them.
                    735:                         */
                    736:                        if ((inp->inp_socket->so_options &
                    737:                            (SO_REUSEPORT|SO_REUSEADDR)) == 0)
                    738:                                break;
                    739:                }
                    740:        } else {
                    741:                /*
                    742:                 * Locate pcb for datagram.
                    743:                 */
                    744:                inp = in_pcblookup_connect(&udbtable, *src4, *sport, *dst4, *dport);
                    745:                if (inp == 0) {
                    746:                        ++udpstat.udps_pcbhashmiss;
                    747:                        inp = in_pcblookup_bind(&udbtable, *dst4, *dport);
1.82      itojun    748:                        if (inp == 0)
1.53      itojun    749:                                return rcvcnt;
                    750:                }
                    751:
1.130     manu      752: #ifdef IPSEC_NAT_T
                    753:                /* Handle ESP over UDP */
                    754:                if (inp->inp_flags & INP_ESPINUDP_ALL) {
                    755:                        struct sockaddr *sa = (struct sockaddr *)src;
                    756:
                    757:                        if (udp4_espinudp(m, off, sa, inp->inp_socket) != 0) {
                    758:                                rcvcnt++;
                    759:                                goto bad;
                    760:                        }
                    761:
                    762:                        /* Normal UDP processing will take place */
                    763:                }
                    764: #endif
                    765:
1.53      itojun    766:                udp4_sendup(m, off, (struct sockaddr *)src, inp->inp_socket);
                    767:                rcvcnt++;
                    768:        }
                    769:
                    770: bad:
                    771:        return rcvcnt;
                    772: }
1.72      itojun    773: #endif
1.53      itojun    774:
                    775: #ifdef INET6
                    776: static int
1.119     matt      777: udp6_realinput(int af, struct sockaddr_in6 *src, struct sockaddr_in6 *dst,
                    778:        struct mbuf *m, int off)
1.53      itojun    779: {
1.79      itojun    780:        u_int16_t sport, dport;
1.53      itojun    781:        int rcvcnt;
1.79      itojun    782:        struct in6_addr src6, dst6;
                    783:        const struct in_addr *dst4;
1.109     itojun    784:        struct inpcb_hdr *inph;
1.53      itojun    785:        struct in6pcb *in6p;
                    786:
                    787:        rcvcnt = 0;
                    788:        off += sizeof(struct udphdr);   /* now, offset of payload */
                    789:
                    790:        if (af != AF_INET && af != AF_INET6)
                    791:                goto bad;
                    792:        if (src->sin6_family != AF_INET6 || dst->sin6_family != AF_INET6)
                    793:                goto bad;
                    794:
1.79      itojun    795:        in6_embedscope(&src6, src, NULL, NULL);
                    796:        sport = src->sin6_port;
                    797:        in6_embedscope(&dst6, dst, NULL, NULL);
                    798:        dport = dst->sin6_port;
1.88      itojun    799:        dst4 = (struct in_addr *)&dst->sin6_addr.s6_addr[12];
1.53      itojun    800:
1.79      itojun    801:        if (IN6_IS_ADDR_MULTICAST(&dst6) ||
                    802:            (af == AF_INET && IN_MULTICAST(dst4->s_addr))) {
1.53      itojun    803:                /*
                    804:                 * Deliver a multicast or broadcast datagram to *all* sockets
                    805:                 * for which the local and remote addresses and ports match
                    806:                 * those of the incoming datagram.  This allows more than
                    807:                 * one process to receive multi/broadcasts on the same port.
                    808:                 * (This really ought to be done for unicast datagrams as
                    809:                 * well, but that would cause problems with existing
                    810:                 * applications that open both address-specific sockets and
                    811:                 * a wildcard socket listening to the same port -- they would
                    812:                 * end up receiving duplicates of every unicast datagram.
                    813:                 * Those applications open the multiple sockets to overcome an
                    814:                 * inadequacy of the UDP socket interface, but for backwards
                    815:                 * compatibility we avoid the problem here rather than
                    816:                 * fixing the interface.  Maybe 4.5BSD will remedy this?)
                    817:                 */
                    818:
                    819:                /*
1.92      itojun    820:                 * KAME note: traditionally we dropped udpiphdr from mbuf here.
1.71      itojun    821:                 * we need udpiphdr for IPsec processing so we do that later.
1.53      itojun    822:                 */
                    823:                /*
                    824:                 * Locate pcb(s) for datagram.
                    825:                 */
1.109     itojun    826:                CIRCLEQ_FOREACH(inph, &udbtable.inpt_queue, inph_queue) {
                    827:                        in6p = (struct in6pcb *)inph;
                    828:                        if (in6p->in6p_af != AF_INET6)
                    829:                                continue;
                    830:
1.79      itojun    831:                        if (in6p->in6p_lport != dport)
1.53      itojun    832:                                continue;
                    833:                        if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) {
1.90      itojun    834:                                if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &dst6))
1.53      itojun    835:                                        continue;
1.92      itojun    836:                        } else {
1.79      itojun    837:                                if (IN6_IS_ADDR_V4MAPPED(&dst6) &&
1.85      itojun    838:                                    (in6p->in6p_flags & IN6P_IPV6_V6ONLY))
1.55      itojun    839:                                        continue;
                    840:                        }
1.53      itojun    841:                        if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
1.79      itojun    842:                                if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr,
                    843:                                    &src6) || in6p->in6p_fport != sport)
1.53      itojun    844:                                        continue;
1.92      itojun    845:                        } else {
1.79      itojun    846:                                if (IN6_IS_ADDR_V4MAPPED(&src6) &&
1.85      itojun    847:                                    (in6p->in6p_flags & IN6P_IPV6_V6ONLY))
1.55      itojun    848:                                        continue;
                    849:                        }
1.53      itojun    850:
                    851:                        udp6_sendup(m, off, (struct sockaddr *)src,
                    852:                                in6p->in6p_socket);
                    853:                        rcvcnt++;
                    854:
                    855:                        /*
                    856:                         * Don't look for additional matches if this one does
                    857:                         * not have either the SO_REUSEPORT or SO_REUSEADDR
                    858:                         * socket options set.  This heuristic avoids searching
                    859:                         * through all pcbs in the common case of a non-shared
                    860:                         * port.  It assumes that an application will never
                    861:                         * clear these options after setting them.
                    862:                         */
                    863:                        if ((in6p->in6p_socket->so_options &
                    864:                            (SO_REUSEPORT|SO_REUSEADDR)) == 0)
                    865:                                break;
                    866:                }
                    867:        } else {
                    868:                /*
                    869:                 * Locate pcb for datagram.
                    870:                 */
1.109     itojun    871:                in6p = in6_pcblookup_connect(&udbtable, &src6, sport,
1.79      itojun    872:                    &dst6, dport, 0);
1.53      itojun    873:                if (in6p == 0) {
                    874:                        ++udpstat.udps_pcbhashmiss;
1.109     itojun    875:                        in6p = in6_pcblookup_bind(&udbtable, &dst6, dport, 0);
1.82      itojun    876:                        if (in6p == 0)
1.53      itojun    877:                                return rcvcnt;
                    878:                }
                    879:
                    880:                udp6_sendup(m, off, (struct sockaddr *)src, in6p->in6p_socket);
                    881:                rcvcnt++;
                    882:        }
                    883:
                    884: bad:
                    885:        return rcvcnt;
                    886: }
                    887: #endif
1.1       cgd       888:
1.72      itojun    889: #ifdef INET
1.1       cgd       890: /*
                    891:  * Notify a udp user of an asynchronous error;
                    892:  * just wake up so that he can collect error status.
                    893:  */
1.7       mycroft   894: static void
1.119     matt      895: udp_notify(struct inpcb *inp, int errno)
1.1       cgd       896: {
                    897:        inp->inp_socket->so_error = errno;
                    898:        sorwakeup(inp->inp_socket);
                    899:        sowwakeup(inp->inp_socket);
                    900: }
                    901:
1.27      christos  902: void *
1.119     matt      903: udp_ctlinput(int cmd, struct sockaddr *sa, void *v)
1.1       cgd       904: {
1.66      augustss  905:        struct ip *ip = v;
                    906:        struct udphdr *uh;
1.119     matt      907:        void (*notify)(struct inpcb *, int) = udp_notify;
1.21      mycroft   908:        int errno;
1.1       cgd       909:
1.53      itojun    910:        if (sa->sa_family != AF_INET
                    911:         || sa->sa_len != sizeof(struct sockaddr_in))
1.51      itojun    912:                return NULL;
1.20      mycroft   913:        if ((unsigned)cmd >= PRC_NCMDS)
1.27      christos  914:                return NULL;
1.20      mycroft   915:        errno = inetctlerrmap[cmd];
1.18      mycroft   916:        if (PRC_IS_REDIRECT(cmd))
1.19      mycroft   917:                notify = in_rtchange, ip = 0;
1.18      mycroft   918:        else if (cmd == PRC_HOSTDEAD)
1.19      mycroft   919:                ip = 0;
1.23      cgd       920:        else if (errno == 0)
1.27      christos  921:                return NULL;
1.19      mycroft   922:        if (ip) {
1.1       cgd       923:                uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2));
1.34      mycroft   924:                in_pcbnotify(&udbtable, satosin(sa)->sin_addr, uh->uh_dport,
                    925:                    ip->ip_src, uh->uh_sport, errno, notify);
1.53      itojun    926:
                    927:                /* XXX mapped address case */
1.19      mycroft   928:        } else
1.34      mycroft   929:                in_pcbnotifyall(&udbtable, satosin(sa)->sin_addr, errno,
                    930:                    notify);
1.27      christos  931:        return NULL;
1.1       cgd       932: }
                    933:
1.7       mycroft   934: int
1.131     perry     935: udp_ctloutput(op, so, level, optname, mp)
1.130     manu      936:        int op;
                    937:        struct socket *so;
                    938:        int level, optname;
                    939:        struct mbuf **mp;
                    940: {
                    941:        int s;
                    942:        int error = 0;
                    943:        struct mbuf *m;
                    944:        struct inpcb *inp;
                    945:        int family;
                    946:
                    947:        family = so->so_proto->pr_domain->dom_family;
                    948:
                    949:        s = splsoftnet();
                    950:        switch (family) {
                    951: #ifdef INET
                    952:        case PF_INET:
                    953:                if (level != IPPROTO_UDP) {
                    954:                        error = ip_ctloutput(op, so, level, optname, mp);
                    955:                        goto end;
                    956:                }
                    957:                break;
                    958: #endif
                    959: #ifdef INET6
                    960:        case PF_INET6:
                    961:                if (level != IPPROTO_UDP) {
                    962:                        error = ip6_ctloutput(op, so, level, optname, mp);
                    963:                        goto end;
                    964:                }
                    965:                break;
                    966: #endif
                    967:        default:
                    968:                error = EAFNOSUPPORT;
                    969:                goto end;
                    970:                break;
                    971:        }
                    972:
                    973:
                    974:        switch (op) {
                    975:        case PRCO_SETOPT:
                    976:                m = *mp;
                    977:                inp = sotoinpcb(so);
                    978:
                    979:                switch (optname) {
                    980:                case UDP_ENCAP:
                    981:                        if (m == NULL || m->m_len < sizeof (int)) {
                    982:                                error = EINVAL;
                    983:                                goto end;
                    984:                        }
1.131     perry     985:
1.130     manu      986:                        switch(*mtod(m, int *)) {
                    987: #ifdef IPSEC_NAT_T
                    988:                        case 0:
                    989:                                inp->inp_flags &= ~INP_ESPINUDP_ALL;
                    990:                                break;
                    991:
                    992:                        case UDP_ENCAP_ESPINUDP:
                    993:                                inp->inp_flags &= ~INP_ESPINUDP_ALL;
                    994:                                inp->inp_flags |= INP_ESPINUDP;
                    995:                                break;
1.131     perry     996:
1.130     manu      997:                        case UDP_ENCAP_ESPINUDP_NON_IKE:
                    998:                                inp->inp_flags &= ~INP_ESPINUDP_ALL;
                    999:                                inp->inp_flags |= INP_ESPINUDP_NON_IKE;
                   1000:                                break;
                   1001: #endif
                   1002:                        default:
                   1003:                                error = EINVAL;
                   1004:                                goto end;
                   1005:                                break;
                   1006:                        }
                   1007:                        break;
                   1008:
                   1009:                default:
                   1010:                        error = ENOPROTOOPT;
                   1011:                        goto end;
                   1012:                        break;
                   1013:                }
                   1014:                break;
                   1015:
                   1016:        default:
                   1017:                error = EINVAL;
                   1018:                goto end;
                   1019:                break;
1.131     perry    1020:        }
                   1021:
1.130     manu     1022: end:
                   1023:        splx(s);
                   1024:        return error;
                   1025: }
1.131     perry    1026:
1.130     manu     1027:
                   1028: int
1.27      christos 1029: udp_output(struct mbuf *m, ...)
                   1030: {
1.66      augustss 1031:        struct inpcb *inp;
                   1032:        struct udpiphdr *ui;
1.125     thorpej  1033:        struct route *ro;
1.66      augustss 1034:        int len = m->m_pkthdr.len;
1.31      mycroft  1035:        int error = 0;
1.27      christos 1036:        va_list ap;
                   1037:
1.98      matt     1038:        MCLAIM(m, &udp_tx_mowner);
1.27      christos 1039:        va_start(ap, m);
                   1040:        inp = va_arg(ap, struct inpcb *);
                   1041:        va_end(ap);
1.1       cgd      1042:
                   1043:        /*
                   1044:         * Calculate data length and get a mbuf
                   1045:         * for UDP and IP headers.
                   1046:         */
1.13      mycroft  1047:        M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT);
                   1048:        if (m == 0) {
                   1049:                error = ENOBUFS;
1.39      thorpej  1050:                goto release;
                   1051:        }
                   1052:
                   1053:        /*
                   1054:         * Compute the packet length of the IP header, and
                   1055:         * punt if the length looks bogus.
                   1056:         */
1.96      itojun   1057:        if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) {
1.39      thorpej  1058:                error = EMSGSIZE;
1.13      mycroft  1059:                goto release;
                   1060:        }
1.1       cgd      1061:
                   1062:        /*
                   1063:         * Fill in mbuf with extended UDP header
                   1064:         * and addresses and length put into network format.
                   1065:         */
                   1066:        ui = mtod(m, struct udpiphdr *);
                   1067:        ui->ui_pr = IPPROTO_UDP;
                   1068:        ui->ui_src = inp->inp_laddr;
                   1069:        ui->ui_dst = inp->inp_faddr;
                   1070:        ui->ui_sport = inp->inp_lport;
                   1071:        ui->ui_dport = inp->inp_fport;
1.78      thorpej  1072:        ui->ui_ulen = htons((u_int16_t)len + sizeof(struct udphdr));
1.1       cgd      1073:
1.125     thorpej  1074:        ro = &inp->inp_route;
                   1075:
1.1       cgd      1076:        /*
1.78      thorpej  1077:         * Set up checksum and output datagram.
1.1       cgd      1078:         */
                   1079:        if (udpcksum) {
1.78      thorpej  1080:                /*
                   1081:                 * XXX Cache pseudo-header checksum part for
                   1082:                 * XXX "connected" UDP sockets.
1.125     thorpej  1083:                 * Maybe skip checksums on loopback interfaces.
1.78      thorpej  1084:                 */
                   1085:                ui->ui_sum = in_cksum_phdr(ui->ui_src.s_addr,
                   1086:                    ui->ui_dst.s_addr, htons((u_int16_t)len +
                   1087:                    sizeof(struct udphdr) + IPPROTO_UDP));
1.125     thorpej  1088:                if (__predict_true(ro->ro_rt == NULL ||
                   1089:                                   !(ro->ro_rt->rt_ifp->if_flags &
                   1090:                                     IFF_LOOPBACK) ||
                   1091:                                   udp_do_loopback_cksum))
                   1092:                        m->m_pkthdr.csum_flags = M_CSUM_UDPv4;
                   1093:                else
                   1094:                        m->m_pkthdr.csum_flags = 0;
1.78      thorpej  1095:                m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
                   1096:        } else
                   1097:                ui->ui_sum = 0;
1.96      itojun   1098:        ((struct ip *)ui)->ip_len = htons(sizeof (struct udpiphdr) + len);
1.1       cgd      1099:        ((struct ip *)ui)->ip_ttl = inp->inp_ip.ip_ttl; /* XXX */
                   1100:        ((struct ip *)ui)->ip_tos = inp->inp_ip.ip_tos; /* XXX */
                   1101:        udpstat.udps_opackets++;
1.48      itojun   1102:
1.125     thorpej  1103:        return (ip_output(m, inp->inp_options, ro,
1.12      mycroft  1104:            inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST),
1.107     itojun   1105:            inp->inp_moptions, inp->inp_socket));
1.1       cgd      1106:
                   1107: release:
                   1108:        m_freem(m);
                   1109:        return (error);
                   1110: }
                   1111:
1.42      thorpej  1112: int    udp_sendspace = 9216;           /* really max datagram size */
                   1113: int    udp_recvspace = 40 * (1024 + sizeof(struct sockaddr_in));
1.1       cgd      1114:                                        /* 40 1K datagrams */
                   1115:
                   1116: /*ARGSUSED*/
1.7       mycroft  1117: int
1.119     matt     1118: udp_usrreq(struct socket *so, int req, struct mbuf *m, struct mbuf *nam,
                   1119:        struct mbuf *control, struct proc *p)
1.1       cgd      1120: {
1.66      augustss 1121:        struct inpcb *inp;
1.1       cgd      1122:        int s;
1.66      augustss 1123:        int error = 0;
1.1       cgd      1124:
                   1125:        if (req == PRU_CONTROL)
1.31      mycroft  1126:                return (in_control(so, (long)m, (caddr_t)nam,
1.30      mycroft  1127:                    (struct ifnet *)control, p));
1.59      thorpej  1128:
1.60      thorpej  1129:        if (req == PRU_PURGEIF) {
1.80      itojun   1130:                in_pcbpurgeif0(&udbtable, (struct ifnet *)control);
1.60      thorpej  1131:                in_purgeif((struct ifnet *)control);
                   1132:                in_pcbpurgeif(&udbtable, (struct ifnet *)control);
1.59      thorpej  1133:                return (0);
                   1134:        }
1.31      mycroft  1135:
                   1136:        s = splsoftnet();
                   1137:        inp = sotoinpcb(so);
1.32      mycroft  1138: #ifdef DIAGNOSTIC
                   1139:        if (req != PRU_SEND && req != PRU_SENDOOB && control)
                   1140:                panic("udp_usrreq: unexpected control mbuf");
                   1141: #endif
1.31      mycroft  1142:        if (inp == 0 && req != PRU_ATTACH) {
                   1143:                error = EINVAL;
                   1144:                goto release;
                   1145:        }
                   1146:
1.1       cgd      1147:        /*
                   1148:         * Note: need to block udp_input while changing
                   1149:         * the udp pcb queue and/or pcb addresses.
                   1150:         */
                   1151:        switch (req) {
                   1152:
                   1153:        case PRU_ATTACH:
1.31      mycroft  1154:                if (inp != 0) {
                   1155:                        error = EISCONN;
1.1       cgd      1156:                        break;
                   1157:                }
1.98      matt     1158: #ifdef MBUFTRACE
                   1159:                so->so_mowner = &udp_mowner;
                   1160:                so->so_rcv.sb_mowner = &udp_rx_mowner;
                   1161:                so->so_snd.sb_mowner = &udp_tx_mowner;
                   1162: #endif
1.31      mycroft  1163:                if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
                   1164:                        error = soreserve(so, udp_sendspace, udp_recvspace);
                   1165:                        if (error)
                   1166:                                break;
                   1167:                }
1.18      mycroft  1168:                error = in_pcballoc(so, &udbtable);
1.1       cgd      1169:                if (error)
                   1170:                        break;
1.31      mycroft  1171:                inp = sotoinpcb(so);
                   1172:                inp->inp_ip.ip_ttl = ip_defttl;
1.1       cgd      1173:                break;
                   1174:
                   1175:        case PRU_DETACH:
1.31      mycroft  1176:                in_pcbdetach(inp);
1.1       cgd      1177:                break;
                   1178:
                   1179:        case PRU_BIND:
1.31      mycroft  1180:                error = in_pcbbind(inp, nam, p);
1.1       cgd      1181:                break;
                   1182:
                   1183:        case PRU_LISTEN:
                   1184:                error = EOPNOTSUPP;
                   1185:                break;
                   1186:
                   1187:        case PRU_CONNECT:
1.31      mycroft  1188:                error = in_pcbconnect(inp, nam);
                   1189:                if (error)
1.1       cgd      1190:                        break;
1.31      mycroft  1191:                soisconnected(so);
1.1       cgd      1192:                break;
                   1193:
                   1194:        case PRU_CONNECT2:
                   1195:                error = EOPNOTSUPP;
                   1196:                break;
                   1197:
                   1198:        case PRU_DISCONNECT:
1.31      mycroft  1199:                /*soisdisconnected(so);*/
                   1200:                so->so_state &= ~SS_ISCONNECTED;        /* XXX */
1.1       cgd      1201:                in_pcbdisconnect(inp);
1.34      mycroft  1202:                inp->inp_laddr = zeroin_addr;           /* XXX */
1.35      mycroft  1203:                in_pcbstate(inp, INP_BOUND);            /* XXX */
1.1       cgd      1204:                break;
                   1205:
                   1206:        case PRU_SHUTDOWN:
                   1207:                socantsendmore(so);
                   1208:                break;
                   1209:
1.31      mycroft  1210:        case PRU_RCVD:
                   1211:                error = EOPNOTSUPP;
1.1       cgd      1212:                break;
                   1213:
1.31      mycroft  1214:        case PRU_SEND:
1.32      mycroft  1215:                if (control && control->m_len) {
                   1216:                        m_freem(control);
                   1217:                        m_freem(m);
                   1218:                        error = EINVAL;
                   1219:                        break;
                   1220:                }
1.31      mycroft  1221:        {
1.35      mycroft  1222:                struct in_addr laddr;                   /* XXX */
1.1       cgd      1223:
1.31      mycroft  1224:                if (nam) {
1.35      mycroft  1225:                        laddr = inp->inp_laddr;         /* XXX */
1.31      mycroft  1226:                        if ((so->so_state & SS_ISCONNECTED) != 0) {
                   1227:                                error = EISCONN;
1.32      mycroft  1228:                                goto die;
1.31      mycroft  1229:                        }
                   1230:                        error = in_pcbconnect(inp, nam);
1.100     matt     1231:                        if (error)
                   1232:                                goto die;
1.31      mycroft  1233:                } else {
                   1234:                        if ((so->so_state & SS_ISCONNECTED) == 0) {
                   1235:                                error = ENOTCONN;
1.32      mycroft  1236:                                goto die;
1.31      mycroft  1237:                        }
                   1238:                }
1.33      mycroft  1239:                error = udp_output(m, inp);
1.100     matt     1240:                m = NULL;
1.31      mycroft  1241:                if (nam) {
                   1242:                        in_pcbdisconnect(inp);
1.35      mycroft  1243:                        inp->inp_laddr = laddr;         /* XXX */
                   1244:                        in_pcbstate(inp, INP_BOUND);    /* XXX */
1.31      mycroft  1245:                }
1.100     matt     1246:          die:
                   1247:                if (m)
                   1248:                        m_freem(m);
1.31      mycroft  1249:        }
1.1       cgd      1250:                break;
                   1251:
                   1252:        case PRU_SENSE:
                   1253:                /*
                   1254:                 * stat: don't bother with a blocksize.
                   1255:                 */
1.31      mycroft  1256:                splx(s);
1.1       cgd      1257:                return (0);
                   1258:
1.31      mycroft  1259:        case PRU_RCVOOB:
                   1260:                error =  EOPNOTSUPP;
                   1261:                break;
                   1262:
1.1       cgd      1263:        case PRU_SENDOOB:
1.32      mycroft  1264:                m_freem(control);
1.31      mycroft  1265:                m_freem(m);
1.1       cgd      1266:                error =  EOPNOTSUPP;
                   1267:                break;
                   1268:
1.31      mycroft  1269:        case PRU_SOCKADDR:
                   1270:                in_setsockaddr(inp, nam);
                   1271:                break;
                   1272:
                   1273:        case PRU_PEERADDR:
                   1274:                in_setpeeraddr(inp, nam);
                   1275:                break;
1.1       cgd      1276:
                   1277:        default:
                   1278:                panic("udp_usrreq");
                   1279:        }
                   1280:
                   1281: release:
1.31      mycroft  1282:        splx(s);
1.1       cgd      1283:        return (error);
1.13      mycroft  1284: }
                   1285:
                   1286: /*
                   1287:  * Sysctl for udp variables.
                   1288:  */
1.114     atatat   1289: SYSCTL_SETUP(sysctl_net_inet_udp_setup, "sysctl net.inet.udp subtree setup")
1.13      mycroft  1290: {
1.114     atatat   1291:
1.116     atatat   1292:        sysctl_createv(clog, 0, NULL, NULL,
                   1293:                       CTLFLAG_PERMANENT,
1.114     atatat   1294:                       CTLTYPE_NODE, "net", NULL,
                   1295:                       NULL, 0, NULL, 0,
                   1296:                       CTL_NET, CTL_EOL);
1.116     atatat   1297:        sysctl_createv(clog, 0, NULL, NULL,
                   1298:                       CTLFLAG_PERMANENT,
1.114     atatat   1299:                       CTLTYPE_NODE, "inet", NULL,
                   1300:                       NULL, 0, NULL, 0,
                   1301:                       CTL_NET, PF_INET, CTL_EOL);
1.116     atatat   1302:        sysctl_createv(clog, 0, NULL, NULL,
                   1303:                       CTLFLAG_PERMANENT,
1.122     atatat   1304:                       CTLTYPE_NODE, "udp",
                   1305:                       SYSCTL_DESCR("UDPv4 related settings"),
1.114     atatat   1306:                       NULL, 0, NULL, 0,
                   1307:                       CTL_NET, PF_INET, IPPROTO_UDP, CTL_EOL);
                   1308:
1.116     atatat   1309:        sysctl_createv(clog, 0, NULL, NULL,
                   1310:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.122     atatat   1311:                       CTLTYPE_INT, "checksum",
1.123     heas     1312:                       SYSCTL_DESCR("Compute UDP checksums"),
1.114     atatat   1313:                       NULL, 0, &udpcksum, 0,
                   1314:                       CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_CHECKSUM,
                   1315:                       CTL_EOL);
1.116     atatat   1316:        sysctl_createv(clog, 0, NULL, NULL,
                   1317:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.122     atatat   1318:                       CTLTYPE_INT, "sendspace",
                   1319:                       SYSCTL_DESCR("Default UDP send buffer size"),
1.114     atatat   1320:                       NULL, 0, &udp_sendspace, 0,
                   1321:                       CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_SENDSPACE,
                   1322:                       CTL_EOL);
1.116     atatat   1323:        sysctl_createv(clog, 0, NULL, NULL,
                   1324:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.122     atatat   1325:                       CTLTYPE_INT, "recvspace",
                   1326:                       SYSCTL_DESCR("Default UDP receive buffer size"),
1.114     atatat   1327:                       NULL, 0, &udp_recvspace, 0,
                   1328:                       CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_RECVSPACE,
                   1329:                       CTL_EOL);
1.125     thorpej  1330:        sysctl_createv(clog, 0, NULL, NULL,
                   1331:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1332:                       CTLTYPE_INT, "do_loopback_cksum",
                   1333:                       SYSCTL_DESCR("Perform UDP checksum on loopback"),
                   1334:                       NULL, 0, &udp_do_loopback_cksum, 0,
                   1335:                       CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_LOOPBACKCKSUM,
                   1336:                       CTL_EOL);
1.132     atatat   1337:        sysctl_createv(clog, 0, NULL, NULL,
                   1338:                       CTLFLAG_PERMANENT,
1.134     atatat   1339:                       CTLTYPE_STRUCT, "pcblist",
1.132     atatat   1340:                       SYSCTL_DESCR("UDP protocol control block list"),
                   1341:                       sysctl_inpcblist, 0, &udbtable, 0,
                   1342:                       CTL_NET, PF_INET, IPPROTO_UDP, CTL_CREATE,
                   1343:                       CTL_EOL);
1.1       cgd      1344: }
1.72      itojun   1345: #endif
1.130     manu     1346:
                   1347: #if (defined INET && defined IPSEC_NAT_T)
                   1348: /*
                   1349:  * Returns:
                   1350:  * 1 if the packet was processed
                   1351:  * 0 if normal UDP processing should take place
                   1352:  */
                   1353: static int
                   1354: udp4_espinudp(m, off, src, so)
                   1355:        struct mbuf *m;
                   1356:        int off;
                   1357:        struct sockaddr *src;
                   1358:        struct socket *so;
                   1359: {
                   1360:        size_t len;
                   1361:        caddr_t data;
                   1362:        struct inpcb *inp;
                   1363:        size_t skip = 0;
                   1364:        size_t minlen;
                   1365:        size_t iphdrlen;
                   1366:        struct ip *ip;
                   1367:        struct mbuf *n;
1.134.2.1  tron     1368:        struct m_tag *tag;
                   1369:        struct udphdr *udphdr;
                   1370:        u_int16_t sport, dport;
1.130     manu     1371:
1.131     perry    1372:        /*
1.130     manu     1373:         * Collapse the mbuf chain if the first mbuf is too short
                   1374:         * The longest case is: UDP + non ESP marker + ESP
                   1375:         */
                   1376:        minlen = off + sizeof(u_int64_t) + sizeof(struct esp);
                   1377:        if (minlen > m->m_pkthdr.len)
                   1378:                minlen = m->m_pkthdr.len;
                   1379:
                   1380:        if (m->m_len < minlen) {
                   1381:                if ((m = m_pullup(m, minlen)) == NULL) {
                   1382:                        printf("udp4_espinudp: m_pullup failed\n");
                   1383:                        return 0;
                   1384:                }
                   1385:        }
                   1386:
1.131     perry    1387:        len = m->m_len - off;
1.130     manu     1388:        data = mtod(m, caddr_t) + off;
                   1389:        inp = sotoinpcb(so);
                   1390:
                   1391:        /* Ignore keepalive packets */
                   1392:        if ((len == 1) && (data[0] == '\xff')) {
                   1393:                return 1;
                   1394:        }
                   1395:
1.131     perry    1396:        /*
                   1397:         * Check that the payload is long enough to hold
1.130     manu     1398:         * an ESP header and compute the length of encapsulation
1.131     perry    1399:         * header to remove
1.130     manu     1400:         */
                   1401:        if (inp->inp_flags & INP_ESPINUDP) {
                   1402:                u_int32_t *st = (u_int32_t *)data;
                   1403:
                   1404:                if ((len <= sizeof(struct esp)) || (*st == 0))
                   1405:                        return 0; /* Normal UDP processing */
                   1406:
                   1407:                skip = sizeof(struct udphdr);
                   1408:        }
                   1409:
                   1410:        if (inp->inp_flags & INP_ESPINUDP_NON_IKE) {
                   1411:                u_int64_t *st = (u_int64_t *)data;
                   1412:
                   1413:                if ((len <= sizeof(u_int64_t) + sizeof(struct esp))
                   1414:                    || (*st != 0))
                   1415:                        return 0; /* Normal UDP processing */
1.131     perry    1416:
1.130     manu     1417:                skip = sizeof(struct udphdr) + sizeof(u_int64_t);
                   1418:        }
                   1419:
                   1420:        /*
1.134.2.1  tron     1421:         * Get the UDP ports. They are handled in network
                   1422:         * order everywhere in IPSEC_NAT_T code.
                   1423:         */
                   1424:        udphdr = (struct udphdr *)(data - skip);
                   1425:        sport = udphdr->uh_sport;
                   1426:        dport = udphdr->uh_dport;
                   1427:
                   1428:        /*
1.130     manu     1429:         * Remove the UDP header (and possibly the non ESP marker)
                   1430:         * IP header lendth is iphdrlen
1.131     perry    1431:         * Before:
1.130     manu     1432:         *   <--- off --->
                   1433:         *   +----+------+-----+
                   1434:         *   | IP |  UDP | ESP |
                   1435:         *   +----+------+-----+
                   1436:         *        <-skip->
                   1437:         * After:
                   1438:         *          +----+-----+
                   1439:         *          | IP | ESP |
                   1440:         *          +----+-----+
                   1441:         *   <-skip->
                   1442:         */
                   1443:        iphdrlen = off - sizeof(struct udphdr);
                   1444:        memmove(mtod(m, caddr_t) + skip, mtod(m, caddr_t), iphdrlen);
                   1445:        m_adj(m, skip);
                   1446:
                   1447:        ip = mtod(m, struct ip *);
                   1448:        ip->ip_len = htons(ntohs(ip->ip_len) - skip);
                   1449:        ip->ip_p = IPPROTO_ESP;
                   1450:
                   1451:        /*
1.131     perry    1452:         * Copy the mbuf to avoid multiple free, as both
                   1453:         * esp4_input (which we call) and udp_input (which
1.130     manu     1454:         * called us) free the mbuf.
                   1455:         */
                   1456:        if ((n = m_dup(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
                   1457:                printf("udp4_espinudp: m_dup failed\n");
                   1458:                return 0;
                   1459:        }
                   1460:
1.134.2.1  tron     1461:        /*
                   1462:         * Add a PACKET_TAG_IPSEC_NAT_T_PORT tag to remember
                   1463:         * the source UDP port. This is required if we want
                   1464:         * to select the right SPD for multiple hosts behind
                   1465:         * same NAT
                   1466:         */
1.134.2.2  tron     1467:        if ((tag = m_tag_get(PACKET_TAG_IPSEC_NAT_T_PORTS,
                   1468:            sizeof(sport) + sizeof(dport), M_DONTWAIT)) == NULL) {
                   1469:                printf("udp4_espinudp: m_tag_get failed\n");
1.134.2.3! tron     1470:                m_freem(n);
1.134.2.2  tron     1471:                return 0;
                   1472:        }
1.134.2.1  tron     1473:        ((u_int16_t *)(tag + 1))[0] = sport;
                   1474:        ((u_int16_t *)(tag + 1))[1] = dport;
                   1475:        m_tag_prepend(n, tag);
                   1476:
1.130     manu     1477:        esp4_input(n, iphdrlen);
                   1478:
                   1479:        /* We handled it, it shoudln't be handled by UDP */
                   1480:        return 1;
                   1481: }
                   1482: #endif

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