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

Annotation of src/sys/netinet/udp_usrreq.c, Revision 1.137

1.137   ! manu        1: /*     $NetBSD: udp_usrreq.c,v 1.136 2005/04/23 14:05:28 manu Exp $    */
1.48      itojun      2:
                      3: /*
                      4:  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
                      5:  * All rights reserved.
1.94      itojun      6:  *
1.48      itojun      7:  * Redistribution and use in source and binary forms, with or without
                      8:  * modification, are permitted provided that the following conditions
                      9:  * are met:
                     10:  * 1. Redistributions of source code must retain the above copyright
                     11:  *    notice, this list of conditions and the following disclaimer.
                     12:  * 2. Redistributions in binary form must reproduce the above copyright
                     13:  *    notice, this list of conditions and the following disclaimer in the
                     14:  *    documentation and/or other materials provided with the distribution.
                     15:  * 3. Neither the name of the project nor the names of its contributors
                     16:  *    may be used to endorse or promote products derived from this software
                     17:  *    without specific prior written permission.
1.94      itojun     18:  *
1.48      itojun     19:  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
                     20:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     21:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     22:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
                     23:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     24:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     25:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     26:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     27:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     28:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     29:  * SUCH DAMAGE.
                     30:  */
1.14      cgd        31:
1.1       cgd        32: /*
1.44      thorpej    33:  * Copyright (c) 1982, 1986, 1988, 1990, 1993, 1995
1.13      mycroft    34:  *     The Regents of the University of California.  All rights reserved.
1.1       cgd        35:  *
                     36:  * Redistribution and use in source and binary forms, with or without
                     37:  * modification, are permitted provided that the following conditions
                     38:  * are met:
                     39:  * 1. Redistributions of source code must retain the above copyright
                     40:  *    notice, this list of conditions and the following disclaimer.
                     41:  * 2. Redistributions in binary form must reproduce the above copyright
                     42:  *    notice, this list of conditions and the following disclaimer in the
                     43:  *    documentation and/or other materials provided with the distribution.
1.104     agc        44:  * 3. Neither the name of the University nor the names of its contributors
1.1       cgd        45:  *    may be used to endorse or promote products derived from this software
                     46:  *    without specific prior written permission.
                     47:  *
                     48:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     49:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     50:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     51:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     52:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     53:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     54:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     55:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     56:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     57:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     58:  * SUCH DAMAGE.
                     59:  *
1.44      thorpej    60:  *     @(#)udp_usrreq.c        8.6 (Berkeley) 5/23/95
1.1       cgd        61:  */
1.91      lukem      62:
                     63: #include <sys/cdefs.h>
1.137   ! manu       64: __KERNEL_RCSID(0, "$NetBSD: udp_usrreq.c,v 1.136 2005/04/23 14:05:28 manu Exp $");
1.50      thorpej    65:
1.77      soda       66: #include "opt_inet.h"
1.50      thorpej    67: #include "opt_ipsec.h"
1.78      thorpej    68: #include "opt_inet_csum.h"
1.64      ws         69: #include "opt_ipkdb.h"
1.101     martin     70: #include "opt_mbuftrace.h"
1.1       cgd        71:
1.5       mycroft    72: #include <sys/param.h>
                     73: #include <sys/malloc.h>
                     74: #include <sys/mbuf.h>
                     75: #include <sys/protosw.h>
                     76: #include <sys/socket.h>
                     77: #include <sys/socketvar.h>
1.13      mycroft    78: #include <sys/errno.h>
1.5       mycroft    79: #include <sys/stat.h>
1.27      christos   80: #include <sys/systm.h>
                     81: #include <sys/proc.h>
1.53      itojun     82: #include <sys/domain.h>
1.27      christos   83: #include <sys/sysctl.h>
1.1       cgd        84:
1.5       mycroft    85: #include <net/if.h>
                     86: #include <net/route.h>
1.1       cgd        87:
1.5       mycroft    88: #include <netinet/in.h>
                     89: #include <netinet/in_systm.h>
1.15      cgd        90: #include <netinet/in_var.h>
1.5       mycroft    91: #include <netinet/ip.h>
                     92: #include <netinet/in_pcb.h>
                     93: #include <netinet/ip_var.h>
                     94: #include <netinet/ip_icmp.h>
                     95: #include <netinet/udp.h>
                     96: #include <netinet/udp_var.h>
1.1       cgd        97:
1.130     manu       98: #ifdef IPSEC_NAT_T
                     99: #include <netinet6/ipsec.h>
                    100: #include <netinet6/esp.h>
                    101: #endif
                    102:
1.53      itojun    103: #ifdef INET6
                    104: #include <netinet/ip6.h>
                    105: #include <netinet/icmp6.h>
                    106: #include <netinet6/ip6_var.h>
                    107: #include <netinet6/in6_pcb.h>
                    108: #include <netinet6/udp6_var.h>
                    109: #endif
                    110:
                    111: #ifndef INET6
                    112: /* always need ip6.h for IP6_EXTHDR_GET */
                    113: #include <netinet/ip6.h>
                    114: #endif
                    115:
1.76      itojun    116: #include "faith.h"
                    117: #if defined(NFAITH) && NFAITH > 0
                    118: #include <net/if_faith.h>
                    119: #endif
                    120:
1.27      christos  121: #include <machine/stdarg.h>
                    122:
1.105     jonathan  123: #ifdef FAST_IPSEC
                    124: #include <netipsec/ipsec.h>
1.121     jonathan  125: #include <netipsec/ipsec_var.h>                        /* XXX ipsecstat namespace */
1.105     jonathan  126: #ifdef INET6
                    127: #include <netipsec/ipsec6.h>
                    128: #endif
                    129: #endif /* FAST_IPSEC*/
                    130:
1.48      itojun    131: #ifdef IPSEC
                    132: #include <netinet6/ipsec.h>
                    133: #include <netkey/key.h>
                    134: #endif /*IPSEC*/
                    135:
1.64      ws        136: #ifdef IPKDB
                    137: #include <ipkdb/ipkdb.h>
                    138: #endif
                    139:
1.8       mycroft   140: /*
                    141:  * UDP protocol implementation.
                    142:  * Per RFC 768, August, 1980.
                    143:  */
                    144: #ifndef        COMPAT_42
                    145: int    udpcksum = 1;
                    146: #else
                    147: int    udpcksum = 0;           /* XXX */
                    148: #endif
1.93      matt      149:
                    150: struct inpcbtable udbtable;
                    151: struct udpstat udpstat;
1.8       mycroft   152:
1.72      itojun    153: #ifdef INET
1.130     manu      154: #ifdef IPSEC_NAT_T
                    155: static int udp4_espinudp (struct mbuf *, int, struct sockaddr *,
                    156:        struct socket *);
                    157: #endif
1.119     matt      158: static void udp4_sendup (struct mbuf *, int, struct sockaddr *,
                    159:        struct socket *);
                    160: static int udp4_realinput (struct sockaddr_in *, struct sockaddr_in *,
                    161:        struct mbuf *, int);
1.129     yamt      162: static int udp4_input_checksum(struct mbuf *, const struct udphdr *, int, int);
1.72      itojun    163: #endif
1.53      itojun    164: #ifdef INET6
1.119     matt      165: static void udp6_sendup (struct mbuf *, int, struct sockaddr *,
                    166:        struct socket *);
                    167: static int udp6_realinput (int, struct sockaddr_in6 *,
                    168:        struct sockaddr_in6 *, struct mbuf *, int);
1.129     yamt      169: static int udp6_input_checksum(struct mbuf *, const struct udphdr *, int, int);
1.53      itojun    170: #endif
1.72      itojun    171: #ifdef INET
1.119     matt      172: static void udp_notify (struct inpcb *, int);
1.72      itojun    173: #endif
1.7       mycroft   174:
1.26      mycroft   175: #ifndef UDBHASHSIZE
                    176: #define        UDBHASHSIZE     128
                    177: #endif
                    178: int    udbhashsize = UDBHASHSIZE;
                    179:
1.98      matt      180: #ifdef MBUFTRACE
                    181: struct mowner udp_mowner = { "udp" };
                    182: struct mowner udp_rx_mowner = { "udp", "rx" };
                    183: struct mowner udp_tx_mowner = { "udp", "tx" };
                    184: #endif
                    185:
1.78      thorpej   186: #ifdef UDP_CSUM_COUNTERS
                    187: #include <sys/device.h>
                    188:
                    189: struct evcnt udp_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    190:     NULL, "udp", "hwcsum bad");
                    191: struct evcnt udp_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    192:     NULL, "udp", "hwcsum ok");
                    193: struct evcnt udp_hwcsum_data = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    194:     NULL, "udp", "hwcsum data");
                    195: struct evcnt udp_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    196:     NULL, "udp", "swcsum");
                    197:
                    198: #define        UDP_CSUM_COUNTER_INCR(ev)       (ev)->ev_count++
                    199:
1.120     matt      200: EVCNT_ATTACH_STATIC(udp_hwcsum_bad);
                    201: EVCNT_ATTACH_STATIC(udp_hwcsum_ok);
                    202: EVCNT_ATTACH_STATIC(udp_hwcsum_data);
                    203: EVCNT_ATTACH_STATIC(udp_swcsum);
                    204:
1.78      thorpej   205: #else
                    206:
                    207: #define        UDP_CSUM_COUNTER_INCR(ev)       /* nothing */
                    208:
                    209: #endif /* UDP_CSUM_COUNTERS */
                    210:
1.7       mycroft   211: void
1.119     matt      212: udp_init(void)
1.1       cgd       213: {
1.18      mycroft   214:
1.35      mycroft   215:        in_pcbinit(&udbtable, udbhashsize, udbhashsize);
1.78      thorpej   216:
1.98      matt      217:        MOWNER_ATTACH(&udp_tx_mowner);
                    218:        MOWNER_ATTACH(&udp_rx_mowner);
                    219:        MOWNER_ATTACH(&udp_mowner);
1.1       cgd       220: }
                    221:
1.129     yamt      222: /*
                    223:  * Checksum extended UDP header and data.
                    224:  */
                    225:
                    226: int
                    227: udp_input_checksum(int af, struct mbuf *m, const struct udphdr *uh,
                    228:     int iphlen, int len)
                    229: {
                    230:
                    231:        switch (af) {
1.72      itojun    232: #ifdef INET
1.129     yamt      233:        case AF_INET:
                    234:                return udp4_input_checksum(m, uh, iphlen, len);
                    235: #endif
                    236: #ifdef INET6
                    237:        case AF_INET6:
                    238:                return udp6_input_checksum(m, uh, iphlen, len);
                    239: #endif
                    240:        }
                    241: #ifdef DIAGNOSTIC
                    242:        panic("udp_input_checksum: unknown af %d", af);
                    243: #endif
                    244:        /* NOTREACHED */
                    245:        return -1;
                    246: }
                    247:
                    248: #ifdef INET
                    249:
                    250: /*
                    251:  * Checksum extended UDP header and data.
                    252:  */
                    253:
                    254: static int
                    255: udp4_input_checksum(struct mbuf *m, const struct udphdr *uh,
                    256:     int iphlen, int len)
                    257: {
                    258:
                    259:        /*
                    260:         * XXX it's better to record and check if this mbuf is
                    261:         * already checked.
                    262:         */
                    263:
                    264:        if (uh->uh_sum == 0)
                    265:                return 0;
                    266:
                    267:        switch (m->m_pkthdr.csum_flags &
                    268:            ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_UDPv4) |
                    269:            M_CSUM_TCP_UDP_BAD | M_CSUM_DATA)) {
                    270:        case M_CSUM_UDPv4|M_CSUM_TCP_UDP_BAD:
                    271:                UDP_CSUM_COUNTER_INCR(&udp_hwcsum_bad);
                    272:                goto badcsum;
                    273:
                    274:        case M_CSUM_UDPv4|M_CSUM_DATA: {
                    275:                u_int32_t hw_csum = m->m_pkthdr.csum_data;
                    276:
                    277:                UDP_CSUM_COUNTER_INCR(&udp_hwcsum_data);
                    278:                if (m->m_pkthdr.csum_flags & M_CSUM_NO_PSEUDOHDR) {
                    279:                        const struct ip *ip =
                    280:                            mtod(m, const struct ip *);
                    281:
                    282:                        hw_csum = in_cksum_phdr(ip->ip_src.s_addr,
                    283:                            ip->ip_dst.s_addr,
                    284:                            htons(hw_csum + len + IPPROTO_UDP));
                    285:                }
                    286:                if ((hw_csum ^ 0xffff) != 0)
                    287:                        goto badcsum;
                    288:                break;
                    289:        }
                    290:
                    291:        case M_CSUM_UDPv4:
                    292:                /* Checksum was okay. */
                    293:                UDP_CSUM_COUNTER_INCR(&udp_hwcsum_ok);
                    294:                break;
                    295:
                    296:        default:
                    297:                /*
                    298:                 * Need to compute it ourselves.  Maybe skip checksum
                    299:                 * on loopback interfaces.
                    300:                 */
                    301:                if (__predict_true(!(m->m_pkthdr.rcvif->if_flags &
                    302:                                     IFF_LOOPBACK) ||
                    303:                                   udp_do_loopback_cksum)) {
                    304:                        UDP_CSUM_COUNTER_INCR(&udp_swcsum);
                    305:                        if (in4_cksum(m, IPPROTO_UDP, iphlen, len) != 0)
                    306:                                goto badcsum;
                    307:                }
                    308:                break;
                    309:        }
                    310:
                    311:        return 0;
                    312:
                    313: badcsum:
                    314:        udpstat.udps_badsum++;
                    315:        return -1;
                    316: }
                    317:
1.7       mycroft   318: void
1.27      christos  319: udp_input(struct mbuf *m, ...)
1.1       cgd       320: {
1.53      itojun    321:        va_list ap;
                    322:        struct sockaddr_in src, dst;
                    323:        struct ip *ip;
                    324:        struct udphdr *uh;
1.97      simonb    325:        int iphlen;
1.53      itojun    326:        int len;
                    327:        int n;
1.96      itojun    328:        u_int16_t ip_len;
1.53      itojun    329:
                    330:        va_start(ap, m);
                    331:        iphlen = va_arg(ap, int);
1.97      simonb    332:        (void)va_arg(ap, int);          /* ignore value, advance ap */
1.53      itojun    333:        va_end(ap);
                    334:
1.98      matt      335:        MCLAIM(m, &udp_rx_mowner);
1.53      itojun    336:        udpstat.udps_ipackets++;
                    337:
                    338:        /*
                    339:         * Get IP and UDP header together in first mbuf.
                    340:         */
                    341:        ip = mtod(m, struct ip *);
                    342:        IP6_EXTHDR_GET(uh, struct udphdr *, m, iphlen, sizeof(struct udphdr));
                    343:        if (uh == NULL) {
                    344:                udpstat.udps_hdrops++;
                    345:                return;
                    346:        }
1.95      thorpej   347:        KASSERT(UDP_HDR_ALIGNED_P(uh));
1.53      itojun    348:
1.57      itojun    349:        /* destination port of 0 is illegal, based on RFC768. */
                    350:        if (uh->uh_dport == 0)
                    351:                goto bad;
                    352:
1.53      itojun    353:        /*
                    354:         * Make mbuf data length reflect UDP length.
                    355:         * If not enough data to reflect UDP length, drop.
                    356:         */
1.96      itojun    357:        ip_len = ntohs(ip->ip_len);
1.53      itojun    358:        len = ntohs((u_int16_t)uh->uh_ulen);
1.96      itojun    359:        if (ip_len != iphlen + len) {
                    360:                if (ip_len < iphlen + len || len < sizeof(struct udphdr)) {
1.53      itojun    361:                        udpstat.udps_badlen++;
                    362:                        goto bad;
                    363:                }
1.96      itojun    364:                m_adj(m, iphlen + len - ip_len);
1.53      itojun    365:        }
                    366:
                    367:        /*
                    368:         * Checksum extended UDP header and data.
                    369:         */
1.129     yamt      370:        if (udp4_input_checksum(m, uh, iphlen, len))
                    371:                goto badcsum;
1.53      itojun    372:
                    373:        /* construct source and dst sockaddrs. */
                    374:        bzero(&src, sizeof(src));
                    375:        src.sin_family = AF_INET;
                    376:        src.sin_len = sizeof(struct sockaddr_in);
                    377:        bcopy(&ip->ip_src, &src.sin_addr, sizeof(src.sin_addr));
                    378:        src.sin_port = uh->uh_sport;
                    379:        bzero(&dst, sizeof(dst));
                    380:        dst.sin_family = AF_INET;
                    381:        dst.sin_len = sizeof(struct sockaddr_in);
                    382:        bcopy(&ip->ip_dst, &dst.sin_addr, sizeof(dst.sin_addr));
                    383:        dst.sin_port = uh->uh_dport;
                    384:
                    385:        n = udp4_realinput(&src, &dst, m, iphlen);
                    386: #ifdef INET6
                    387:        if (IN_MULTICAST(ip->ip_dst.s_addr) || n == 0) {
                    388:                struct sockaddr_in6 src6, dst6;
                    389:
                    390:                bzero(&src6, sizeof(src6));
                    391:                src6.sin6_family = AF_INET6;
                    392:                src6.sin6_len = sizeof(struct sockaddr_in6);
                    393:                src6.sin6_addr.s6_addr[10] = src6.sin6_addr.s6_addr[11] = 0xff;
                    394:                bcopy(&ip->ip_src, &src6.sin6_addr.s6_addr[12],
                    395:                        sizeof(ip->ip_src));
                    396:                src6.sin6_port = uh->uh_sport;
                    397:                bzero(&dst6, sizeof(dst6));
                    398:                dst6.sin6_family = AF_INET6;
                    399:                dst6.sin6_len = sizeof(struct sockaddr_in6);
                    400:                dst6.sin6_addr.s6_addr[10] = dst6.sin6_addr.s6_addr[11] = 0xff;
                    401:                bcopy(&ip->ip_dst, &dst6.sin6_addr.s6_addr[12],
                    402:                        sizeof(ip->ip_dst));
                    403:                dst6.sin6_port = uh->uh_dport;
                    404:
                    405:                n += udp6_realinput(AF_INET, &src6, &dst6, m, iphlen);
                    406:        }
                    407: #endif
                    408:
                    409:        if (n == 0) {
                    410:                if (m->m_flags & (M_BCAST | M_MCAST)) {
                    411:                        udpstat.udps_noportbcast++;
                    412:                        goto bad;
                    413:                }
1.61      itojun    414:                udpstat.udps_noport++;
1.64      ws        415: #ifdef IPKDB
1.53      itojun    416:                if (checkipkdb(&ip->ip_src, uh->uh_sport, uh->uh_dport,
                    417:                                m, iphlen + sizeof(struct udphdr),
                    418:                                m->m_pkthdr.len - iphlen - sizeof(struct udphdr))) {
                    419:                        /*
                    420:                         * It was a debugger connect packet,
                    421:                         * just drop it now
                    422:                         */
                    423:                        goto bad;
                    424:                }
                    425: #endif
                    426:                icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0);
                    427:                m = NULL;
                    428:        }
                    429:
                    430: bad:
                    431:        if (m)
                    432:                m_freem(m);
1.78      thorpej   433:        return;
                    434:
                    435: badcsum:
                    436:        m_freem(m);
1.53      itojun    437: }
1.72      itojun    438: #endif
1.53      itojun    439:
                    440: #ifdef INET6
1.129     yamt      441: static int
                    442: udp6_input_checksum(struct mbuf *m, const struct udphdr *uh, int off, int len)
                    443: {
                    444:
                    445:        if (__predict_false((m->m_flags & M_LOOP) && !udp_do_loopback_cksum)) {
                    446:                goto good;
                    447:        }
                    448:        if (uh->uh_sum == 0) {
                    449:                udp6stat.udp6s_nosum++;
                    450:                goto bad;
                    451:        }
                    452:        if (in6_cksum(m, IPPROTO_UDP, off, len) != 0) {
                    453:                udp6stat.udp6s_badsum++;
                    454:                goto bad;
                    455:        }
                    456:
                    457: good:
                    458:        return 0;
                    459: bad:
                    460:        return -1;
                    461: }
                    462:
1.53      itojun    463: int
1.119     matt      464: udp6_input(struct mbuf **mp, int *offp, int proto)
1.53      itojun    465: {
                    466:        struct mbuf *m = *mp;
                    467:        int off = *offp;
                    468:        struct sockaddr_in6 src, dst;
                    469:        struct ip6_hdr *ip6;
                    470:        struct udphdr *uh;
                    471:        u_int32_t plen, ulen;
                    472:
1.76      itojun    473:        ip6 = mtod(m, struct ip6_hdr *);
                    474:
1.53      itojun    475: #if defined(NFAITH) && 0 < NFAITH
1.76      itojun    476:        if (faithprefix(&ip6->ip6_dst)) {
                    477:                /* send icmp6 host unreach? */
                    478:                m_freem(m);
                    479:                return IPPROTO_DONE;
1.53      itojun    480:        }
                    481: #endif
                    482:
                    483:        udp6stat.udp6s_ipackets++;
                    484:
                    485:        /* check for jumbogram is done in ip6_input.  we can trust pkthdr.len */
                    486:        plen = m->m_pkthdr.len - off;
                    487:        IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(struct udphdr));
                    488:        if (uh == NULL) {
                    489:                ip6stat.ip6s_tooshort++;
                    490:                return IPPROTO_DONE;
                    491:        }
1.95      thorpej   492:        KASSERT(UDP_HDR_ALIGNED_P(uh));
1.53      itojun    493:        ulen = ntohs((u_short)uh->uh_ulen);
1.69      itojun    494:        /*
                    495:         * RFC2675 section 4: jumbograms will have 0 in the UDP header field,
                    496:         * iff payload length > 0xffff.
                    497:         */
1.53      itojun    498:        if (ulen == 0 && plen > 0xffff)
                    499:                ulen = plen;
                    500:
                    501:        if (plen != ulen) {
                    502:                udp6stat.udp6s_badlen++;
1.54      itojun    503:                goto bad;
                    504:        }
                    505:
1.57      itojun    506:        /* destination port of 0 is illegal, based on RFC768. */
                    507:        if (uh->uh_dport == 0)
                    508:                goto bad;
                    509:
1.54      itojun    510:        /* Be proactive about malicious use of IPv4 mapped address */
                    511:        if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
                    512:            IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
                    513:                /* XXX stat */
1.53      itojun    514:                goto bad;
                    515:        }
                    516:
                    517:        /*
1.125     thorpej   518:         * Checksum extended UDP header and data.  Maybe skip checksum
                    519:         * on loopback interfaces.
1.53      itojun    520:         */
1.129     yamt      521:        if (udp6_input_checksum(m, uh, off, ulen))
                    522:                goto bad;
1.53      itojun    523:
                    524:        /*
                    525:         * Construct source and dst sockaddrs.
                    526:         * Note that ifindex (s6_addr16[1]) is already filled.
                    527:         */
                    528:        bzero(&src, sizeof(src));
                    529:        src.sin6_family = AF_INET6;
                    530:        src.sin6_len = sizeof(struct sockaddr_in6);
1.69      itojun    531:        /* KAME hack: recover scopeid */
                    532:        (void)in6_recoverscope(&src, &ip6->ip6_src, m->m_pkthdr.rcvif);
1.53      itojun    533:        src.sin6_port = uh->uh_sport;
                    534:        bzero(&dst, sizeof(dst));
                    535:        dst.sin6_family = AF_INET6;
                    536:        dst.sin6_len = sizeof(struct sockaddr_in6);
1.69      itojun    537:        /* KAME hack: recover scopeid */
                    538:        (void)in6_recoverscope(&dst, &ip6->ip6_dst, m->m_pkthdr.rcvif);
1.53      itojun    539:        dst.sin6_port = uh->uh_dport;
                    540:
                    541:        if (udp6_realinput(AF_INET6, &src, &dst, m, off) == 0) {
                    542:                if (m->m_flags & M_MCAST) {
                    543:                        udp6stat.udp6s_noportmcast++;
                    544:                        goto bad;
                    545:                }
1.61      itojun    546:                udp6stat.udp6s_noport++;
1.53      itojun    547:                icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
                    548:                m = NULL;
                    549:        }
                    550:
                    551: bad:
                    552:        if (m)
                    553:                m_freem(m);
                    554:        return IPPROTO_DONE;
                    555: }
                    556: #endif
                    557:
1.72      itojun    558: #ifdef INET
1.53      itojun    559: static void
1.119     matt      560: udp4_sendup(struct mbuf *m, int off /* offset of data portion */,
                    561:        struct sockaddr *src, struct socket *so)
1.53      itojun    562: {
                    563:        struct mbuf *opts = NULL;
                    564:        struct mbuf *n;
                    565:        struct inpcb *inp = NULL;
                    566:
                    567:        if (!so)
                    568:                return;
                    569:        switch (so->so_proto->pr_domain->dom_family) {
                    570:        case AF_INET:
                    571:                inp = sotoinpcb(so);
                    572:                break;
                    573: #ifdef INET6
                    574:        case AF_INET6:
                    575:                break;
                    576: #endif
                    577:        default:
                    578:                return;
                    579:        }
                    580:
1.105     jonathan  581: #if defined(IPSEC) || defined(FAST_IPSEC)
1.53      itojun    582:        /* check AH/ESP integrity. */
                    583:        if (so != NULL && ipsec4_in_reject_so(m, so)) {
                    584:                ipsecstat.in_polvio++;
1.110     itojun    585:                if ((n = m_copy(m, 0, M_COPYALL)) != NULL)
                    586:                        icmp_error(n, ICMP_UNREACH, ICMP_UNREACH_ADMIN_PROHIBIT,
                    587:                            0, 0);
1.53      itojun    588:                return;
                    589:        }
                    590: #endif /*IPSEC*/
                    591:
                    592:        if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
                    593:                if (inp && (inp->inp_flags & INP_CONTROLOPTS
                    594:                         || so->so_options & SO_TIMESTAMP)) {
                    595:                        struct ip *ip = mtod(n, struct ip *);
                    596:                        ip_savecontrol(inp, &opts, ip, n);
                    597:                }
                    598:
                    599:                m_adj(n, off);
                    600:                if (sbappendaddr(&so->so_rcv, src, n,
                    601:                                opts) == 0) {
                    602:                        m_freem(n);
                    603:                        if (opts)
                    604:                                m_freem(opts);
1.124     darrenr   605:                        so->so_rcv.sb_overflowed++;
1.81      enami     606:                        udpstat.udps_fullsock++;
1.53      itojun    607:                } else
                    608:                        sorwakeup(so);
                    609:        }
                    610: }
1.72      itojun    611: #endif
1.53      itojun    612:
                    613: #ifdef INET6
                    614: static void
1.119     matt      615: udp6_sendup(struct mbuf *m, int off /* offset of data portion */,
                    616:        struct sockaddr *src, struct socket *so)
1.53      itojun    617: {
                    618:        struct mbuf *opts = NULL;
                    619:        struct mbuf *n;
                    620:        struct in6pcb *in6p = NULL;
                    621:
                    622:        if (!so)
                    623:                return;
                    624:        if (so->so_proto->pr_domain->dom_family != AF_INET6)
                    625:                return;
                    626:        in6p = sotoin6pcb(so);
                    627:
1.105     jonathan  628: #if defined(IPSEC) || defined(FAST_IPSEC)
1.53      itojun    629:        /* check AH/ESP integrity. */
                    630:        if (so != NULL && ipsec6_in_reject_so(m, so)) {
                    631:                ipsec6stat.in_polvio++;
1.111     mycroft   632:                if ((n = m_copy(m, 0, M_COPYALL)) != NULL)
1.110     itojun    633:                        icmp6_error(n, ICMP6_DST_UNREACH,
                    634:                            ICMP6_DST_UNREACH_ADMIN, 0);
1.53      itojun    635:                return;
                    636:        }
                    637: #endif /*IPSEC*/
                    638:
                    639:        if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
                    640:                if (in6p && (in6p->in6p_flags & IN6P_CONTROLOPTS
                    641:                          || in6p->in6p_socket->so_options & SO_TIMESTAMP)) {
                    642:                        struct ip6_hdr *ip6 = mtod(n, struct ip6_hdr *);
                    643:                        ip6_savecontrol(in6p, &opts, ip6, n);
                    644:                }
                    645:
                    646:                m_adj(n, off);
                    647:                if (sbappendaddr(&so->so_rcv, src, n, opts) == 0) {
                    648:                        m_freem(n);
                    649:                        if (opts)
                    650:                                m_freem(opts);
1.124     darrenr   651:                        so->so_rcv.sb_overflowed++;
1.53      itojun    652:                        udp6stat.udp6s_fullsock++;
                    653:                } else
                    654:                        sorwakeup(so);
                    655:        }
                    656: }
                    657: #endif
                    658:
1.72      itojun    659: #ifdef INET
1.53      itojun    660: static int
1.119     matt      661: udp4_realinput(struct sockaddr_in *src, struct sockaddr_in *dst,
                    662:        struct mbuf *m, int off /* offset of udphdr */)
1.53      itojun    663: {
                    664:        u_int16_t *sport, *dport;
                    665:        int rcvcnt;
                    666:        struct in_addr *src4, *dst4;
1.109     itojun    667:        struct inpcb_hdr *inph;
1.53      itojun    668:        struct inpcb *inp;
                    669:
                    670:        rcvcnt = 0;
                    671:        off += sizeof(struct udphdr);   /* now, offset of payload */
                    672:
                    673:        if (src->sin_family != AF_INET || dst->sin_family != AF_INET)
                    674:                goto bad;
                    675:
                    676:        src4 = &src->sin_addr;
                    677:        sport = &src->sin_port;
                    678:        dst4 = &dst->sin_addr;
                    679:        dport = &dst->sin_port;
                    680:
1.73      itojun    681:        if (IN_MULTICAST(dst4->s_addr) ||
1.53      itojun    682:            in_broadcast(*dst4, m->m_pkthdr.rcvif)) {
                    683:                /*
                    684:                 * Deliver a multicast or broadcast datagram to *all* sockets
                    685:                 * for which the local and remote addresses and ports match
                    686:                 * those of the incoming datagram.  This allows more than
                    687:                 * one process to receive multi/broadcasts on the same port.
                    688:                 * (This really ought to be done for unicast datagrams as
                    689:                 * well, but that would cause problems with existing
                    690:                 * applications that open both address-specific sockets and
                    691:                 * a wildcard socket listening to the same port -- they would
                    692:                 * end up receiving duplicates of every unicast datagram.
                    693:                 * Those applications open the multiple sockets to overcome an
                    694:                 * inadequacy of the UDP socket interface, but for backwards
                    695:                 * compatibility we avoid the problem here rather than
                    696:                 * fixing the interface.  Maybe 4.5BSD will remedy this?)
                    697:                 */
                    698:
                    699:                /*
1.92      itojun    700:                 * KAME note: traditionally we dropped udpiphdr from mbuf here.
1.71      itojun    701:                 * we need udpiphdr for IPsec processing so we do that later.
1.53      itojun    702:                 */
                    703:                /*
                    704:                 * Locate pcb(s) for datagram.
                    705:                 */
1.109     itojun    706:                CIRCLEQ_FOREACH(inph, &udbtable.inpt_queue, inph_queue) {
                    707:                        inp = (struct inpcb *)inph;
                    708:                        if (inp->inp_af != AF_INET)
                    709:                                continue;
                    710:
1.53      itojun    711:                        if (inp->inp_lport != *dport)
                    712:                                continue;
                    713:                        if (!in_nullhost(inp->inp_laddr)) {
                    714:                                if (!in_hosteq(inp->inp_laddr, *dst4))
                    715:                                        continue;
                    716:                        }
                    717:                        if (!in_nullhost(inp->inp_faddr)) {
                    718:                                if (!in_hosteq(inp->inp_faddr, *src4) ||
                    719:                                    inp->inp_fport != *sport)
                    720:                                        continue;
                    721:                        }
                    722:
                    723:                        udp4_sendup(m, off, (struct sockaddr *)src,
                    724:                                inp->inp_socket);
                    725:                        rcvcnt++;
                    726:
                    727:                        /*
                    728:                         * Don't look for additional matches if this one does
                    729:                         * not have either the SO_REUSEPORT or SO_REUSEADDR
                    730:                         * socket options set.  This heuristic avoids searching
                    731:                         * through all pcbs in the common case of a non-shared
                    732:                         * port.  It assumes that an application will never
                    733:                         * clear these options after setting them.
                    734:                         */
                    735:                        if ((inp->inp_socket->so_options &
                    736:                            (SO_REUSEPORT|SO_REUSEADDR)) == 0)
                    737:                                break;
                    738:                }
                    739:        } else {
                    740:                /*
                    741:                 * Locate pcb for datagram.
                    742:                 */
                    743:                inp = in_pcblookup_connect(&udbtable, *src4, *sport, *dst4, *dport);
                    744:                if (inp == 0) {
                    745:                        ++udpstat.udps_pcbhashmiss;
                    746:                        inp = in_pcblookup_bind(&udbtable, *dst4, *dport);
1.82      itojun    747:                        if (inp == 0)
1.53      itojun    748:                                return rcvcnt;
                    749:                }
                    750:
1.130     manu      751: #ifdef IPSEC_NAT_T
                    752:                /* Handle ESP over UDP */
                    753:                if (inp->inp_flags & INP_ESPINUDP_ALL) {
                    754:                        struct sockaddr *sa = (struct sockaddr *)src;
                    755:
                    756:                        if (udp4_espinudp(m, off, sa, inp->inp_socket) != 0) {
                    757:                                rcvcnt++;
                    758:                                goto bad;
                    759:                        }
                    760:
                    761:                        /* Normal UDP processing will take place */
                    762:                }
                    763: #endif
                    764:
1.53      itojun    765:                udp4_sendup(m, off, (struct sockaddr *)src, inp->inp_socket);
                    766:                rcvcnt++;
                    767:        }
                    768:
                    769: bad:
                    770:        return rcvcnt;
                    771: }
1.72      itojun    772: #endif
1.53      itojun    773:
                    774: #ifdef INET6
                    775: static int
1.119     matt      776: udp6_realinput(int af, struct sockaddr_in6 *src, struct sockaddr_in6 *dst,
                    777:        struct mbuf *m, int off)
1.53      itojun    778: {
1.79      itojun    779:        u_int16_t sport, dport;
1.53      itojun    780:        int rcvcnt;
1.79      itojun    781:        struct in6_addr src6, dst6;
                    782:        const struct in_addr *dst4;
1.109     itojun    783:        struct inpcb_hdr *inph;
1.53      itojun    784:        struct in6pcb *in6p;
                    785:
                    786:        rcvcnt = 0;
                    787:        off += sizeof(struct udphdr);   /* now, offset of payload */
                    788:
                    789:        if (af != AF_INET && af != AF_INET6)
                    790:                goto bad;
                    791:        if (src->sin6_family != AF_INET6 || dst->sin6_family != AF_INET6)
                    792:                goto bad;
                    793:
1.79      itojun    794:        in6_embedscope(&src6, src, NULL, NULL);
                    795:        sport = src->sin6_port;
                    796:        in6_embedscope(&dst6, dst, NULL, NULL);
                    797:        dport = dst->sin6_port;
1.88      itojun    798:        dst4 = (struct in_addr *)&dst->sin6_addr.s6_addr[12];
1.53      itojun    799:
1.79      itojun    800:        if (IN6_IS_ADDR_MULTICAST(&dst6) ||
                    801:            (af == AF_INET && IN_MULTICAST(dst4->s_addr))) {
1.53      itojun    802:                /*
                    803:                 * Deliver a multicast or broadcast datagram to *all* sockets
                    804:                 * for which the local and remote addresses and ports match
                    805:                 * those of the incoming datagram.  This allows more than
                    806:                 * one process to receive multi/broadcasts on the same port.
                    807:                 * (This really ought to be done for unicast datagrams as
                    808:                 * well, but that would cause problems with existing
                    809:                 * applications that open both address-specific sockets and
                    810:                 * a wildcard socket listening to the same port -- they would
                    811:                 * end up receiving duplicates of every unicast datagram.
                    812:                 * Those applications open the multiple sockets to overcome an
                    813:                 * inadequacy of the UDP socket interface, but for backwards
                    814:                 * compatibility we avoid the problem here rather than
                    815:                 * fixing the interface.  Maybe 4.5BSD will remedy this?)
                    816:                 */
                    817:
                    818:                /*
1.92      itojun    819:                 * KAME note: traditionally we dropped udpiphdr from mbuf here.
1.71      itojun    820:                 * we need udpiphdr for IPsec processing so we do that later.
1.53      itojun    821:                 */
                    822:                /*
                    823:                 * Locate pcb(s) for datagram.
                    824:                 */
1.109     itojun    825:                CIRCLEQ_FOREACH(inph, &udbtable.inpt_queue, inph_queue) {
                    826:                        in6p = (struct in6pcb *)inph;
                    827:                        if (in6p->in6p_af != AF_INET6)
                    828:                                continue;
                    829:
1.79      itojun    830:                        if (in6p->in6p_lport != dport)
1.53      itojun    831:                                continue;
                    832:                        if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) {
1.90      itojun    833:                                if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &dst6))
1.53      itojun    834:                                        continue;
1.92      itojun    835:                        } else {
1.79      itojun    836:                                if (IN6_IS_ADDR_V4MAPPED(&dst6) &&
1.85      itojun    837:                                    (in6p->in6p_flags & IN6P_IPV6_V6ONLY))
1.55      itojun    838:                                        continue;
                    839:                        }
1.53      itojun    840:                        if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
1.79      itojun    841:                                if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr,
                    842:                                    &src6) || in6p->in6p_fport != sport)
1.53      itojun    843:                                        continue;
1.92      itojun    844:                        } else {
1.79      itojun    845:                                if (IN6_IS_ADDR_V4MAPPED(&src6) &&
1.85      itojun    846:                                    (in6p->in6p_flags & IN6P_IPV6_V6ONLY))
1.55      itojun    847:                                        continue;
                    848:                        }
1.53      itojun    849:
                    850:                        udp6_sendup(m, off, (struct sockaddr *)src,
                    851:                                in6p->in6p_socket);
                    852:                        rcvcnt++;
                    853:
                    854:                        /*
                    855:                         * Don't look for additional matches if this one does
                    856:                         * not have either the SO_REUSEPORT or SO_REUSEADDR
                    857:                         * socket options set.  This heuristic avoids searching
                    858:                         * through all pcbs in the common case of a non-shared
                    859:                         * port.  It assumes that an application will never
                    860:                         * clear these options after setting them.
                    861:                         */
                    862:                        if ((in6p->in6p_socket->so_options &
                    863:                            (SO_REUSEPORT|SO_REUSEADDR)) == 0)
                    864:                                break;
                    865:                }
                    866:        } else {
                    867:                /*
                    868:                 * Locate pcb for datagram.
                    869:                 */
1.109     itojun    870:                in6p = in6_pcblookup_connect(&udbtable, &src6, sport,
1.79      itojun    871:                    &dst6, dport, 0);
1.53      itojun    872:                if (in6p == 0) {
                    873:                        ++udpstat.udps_pcbhashmiss;
1.109     itojun    874:                        in6p = in6_pcblookup_bind(&udbtable, &dst6, dport, 0);
1.82      itojun    875:                        if (in6p == 0)
1.53      itojun    876:                                return rcvcnt;
                    877:                }
                    878:
                    879:                udp6_sendup(m, off, (struct sockaddr *)src, in6p->in6p_socket);
                    880:                rcvcnt++;
                    881:        }
                    882:
                    883: bad:
                    884:        return rcvcnt;
                    885: }
                    886: #endif
1.1       cgd       887:
1.72      itojun    888: #ifdef INET
1.1       cgd       889: /*
                    890:  * Notify a udp user of an asynchronous error;
                    891:  * just wake up so that he can collect error status.
                    892:  */
1.7       mycroft   893: static void
1.119     matt      894: udp_notify(struct inpcb *inp, int errno)
1.1       cgd       895: {
                    896:        inp->inp_socket->so_error = errno;
                    897:        sorwakeup(inp->inp_socket);
                    898:        sowwakeup(inp->inp_socket);
                    899: }
                    900:
1.27      christos  901: void *
1.119     matt      902: udp_ctlinput(int cmd, struct sockaddr *sa, void *v)
1.1       cgd       903: {
1.66      augustss  904:        struct ip *ip = v;
                    905:        struct udphdr *uh;
1.119     matt      906:        void (*notify)(struct inpcb *, int) = udp_notify;
1.21      mycroft   907:        int errno;
1.1       cgd       908:
1.53      itojun    909:        if (sa->sa_family != AF_INET
                    910:         || sa->sa_len != sizeof(struct sockaddr_in))
1.51      itojun    911:                return NULL;
1.20      mycroft   912:        if ((unsigned)cmd >= PRC_NCMDS)
1.27      christos  913:                return NULL;
1.20      mycroft   914:        errno = inetctlerrmap[cmd];
1.18      mycroft   915:        if (PRC_IS_REDIRECT(cmd))
1.19      mycroft   916:                notify = in_rtchange, ip = 0;
1.18      mycroft   917:        else if (cmd == PRC_HOSTDEAD)
1.19      mycroft   918:                ip = 0;
1.23      cgd       919:        else if (errno == 0)
1.27      christos  920:                return NULL;
1.19      mycroft   921:        if (ip) {
1.1       cgd       922:                uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2));
1.34      mycroft   923:                in_pcbnotify(&udbtable, satosin(sa)->sin_addr, uh->uh_dport,
                    924:                    ip->ip_src, uh->uh_sport, errno, notify);
1.53      itojun    925:
                    926:                /* XXX mapped address case */
1.19      mycroft   927:        } else
1.34      mycroft   928:                in_pcbnotifyall(&udbtable, satosin(sa)->sin_addr, errno,
                    929:                    notify);
1.27      christos  930:        return NULL;
1.1       cgd       931: }
                    932:
1.7       mycroft   933: int
1.131     perry     934: udp_ctloutput(op, so, level, optname, mp)
1.130     manu      935:        int op;
                    936:        struct socket *so;
                    937:        int level, optname;
                    938:        struct mbuf **mp;
                    939: {
                    940:        int s;
                    941:        int error = 0;
                    942:        struct mbuf *m;
                    943:        struct inpcb *inp;
                    944:        int family;
                    945:
                    946:        family = so->so_proto->pr_domain->dom_family;
                    947:
                    948:        s = splsoftnet();
                    949:        switch (family) {
                    950: #ifdef INET
                    951:        case PF_INET:
                    952:                if (level != IPPROTO_UDP) {
                    953:                        error = ip_ctloutput(op, so, level, optname, mp);
                    954:                        goto end;
                    955:                }
                    956:                break;
                    957: #endif
                    958: #ifdef INET6
                    959:        case PF_INET6:
                    960:                if (level != IPPROTO_UDP) {
                    961:                        error = ip6_ctloutput(op, so, level, optname, mp);
                    962:                        goto end;
                    963:                }
                    964:                break;
                    965: #endif
                    966:        default:
                    967:                error = EAFNOSUPPORT;
                    968:                goto end;
                    969:                break;
                    970:        }
                    971:
                    972:
                    973:        switch (op) {
                    974:        case PRCO_SETOPT:
                    975:                m = *mp;
                    976:                inp = sotoinpcb(so);
                    977:
                    978:                switch (optname) {
                    979:                case UDP_ENCAP:
                    980:                        if (m == NULL || m->m_len < sizeof (int)) {
                    981:                                error = EINVAL;
                    982:                                goto end;
                    983:                        }
1.131     perry     984:
1.130     manu      985:                        switch(*mtod(m, int *)) {
                    986: #ifdef IPSEC_NAT_T
                    987:                        case 0:
                    988:                                inp->inp_flags &= ~INP_ESPINUDP_ALL;
                    989:                                break;
                    990:
                    991:                        case UDP_ENCAP_ESPINUDP:
                    992:                                inp->inp_flags &= ~INP_ESPINUDP_ALL;
                    993:                                inp->inp_flags |= INP_ESPINUDP;
                    994:                                break;
1.131     perry     995:
1.130     manu      996:                        case UDP_ENCAP_ESPINUDP_NON_IKE:
                    997:                                inp->inp_flags &= ~INP_ESPINUDP_ALL;
                    998:                                inp->inp_flags |= INP_ESPINUDP_NON_IKE;
                    999:                                break;
                   1000: #endif
                   1001:                        default:
                   1002:                                error = EINVAL;
                   1003:                                goto end;
                   1004:                                break;
                   1005:                        }
                   1006:                        break;
                   1007:
                   1008:                default:
                   1009:                        error = ENOPROTOOPT;
                   1010:                        goto end;
                   1011:                        break;
                   1012:                }
                   1013:                break;
                   1014:
                   1015:        default:
                   1016:                error = EINVAL;
                   1017:                goto end;
                   1018:                break;
1.131     perry    1019:        }
                   1020:
1.130     manu     1021: end:
                   1022:        splx(s);
                   1023:        return error;
                   1024: }
1.131     perry    1025:
1.130     manu     1026:
                   1027: int
1.27      christos 1028: udp_output(struct mbuf *m, ...)
                   1029: {
1.66      augustss 1030:        struct inpcb *inp;
                   1031:        struct udpiphdr *ui;
1.125     thorpej  1032:        struct route *ro;
1.66      augustss 1033:        int len = m->m_pkthdr.len;
1.31      mycroft  1034:        int error = 0;
1.27      christos 1035:        va_list ap;
                   1036:
1.98      matt     1037:        MCLAIM(m, &udp_tx_mowner);
1.27      christos 1038:        va_start(ap, m);
                   1039:        inp = va_arg(ap, struct inpcb *);
                   1040:        va_end(ap);
1.1       cgd      1041:
                   1042:        /*
                   1043:         * Calculate data length and get a mbuf
                   1044:         * for UDP and IP headers.
                   1045:         */
1.13      mycroft  1046:        M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT);
                   1047:        if (m == 0) {
                   1048:                error = ENOBUFS;
1.39      thorpej  1049:                goto release;
                   1050:        }
                   1051:
                   1052:        /*
                   1053:         * Compute the packet length of the IP header, and
                   1054:         * punt if the length looks bogus.
                   1055:         */
1.96      itojun   1056:        if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) {
1.39      thorpej  1057:                error = EMSGSIZE;
1.13      mycroft  1058:                goto release;
                   1059:        }
1.1       cgd      1060:
                   1061:        /*
                   1062:         * Fill in mbuf with extended UDP header
                   1063:         * and addresses and length put into network format.
                   1064:         */
                   1065:        ui = mtod(m, struct udpiphdr *);
                   1066:        ui->ui_pr = IPPROTO_UDP;
                   1067:        ui->ui_src = inp->inp_laddr;
                   1068:        ui->ui_dst = inp->inp_faddr;
                   1069:        ui->ui_sport = inp->inp_lport;
                   1070:        ui->ui_dport = inp->inp_fport;
1.78      thorpej  1071:        ui->ui_ulen = htons((u_int16_t)len + sizeof(struct udphdr));
1.1       cgd      1072:
1.125     thorpej  1073:        ro = &inp->inp_route;
                   1074:
1.1       cgd      1075:        /*
1.78      thorpej  1076:         * Set up checksum and output datagram.
1.1       cgd      1077:         */
                   1078:        if (udpcksum) {
1.78      thorpej  1079:                /*
                   1080:                 * XXX Cache pseudo-header checksum part for
                   1081:                 * XXX "connected" UDP sockets.
                   1082:                 */
                   1083:                ui->ui_sum = in_cksum_phdr(ui->ui_src.s_addr,
                   1084:                    ui->ui_dst.s_addr, htons((u_int16_t)len +
                   1085:                    sizeof(struct udphdr) + IPPROTO_UDP));
1.135     yamt     1086:                m->m_pkthdr.csum_flags = M_CSUM_UDPv4;
1.78      thorpej  1087:                m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
                   1088:        } else
                   1089:                ui->ui_sum = 0;
1.96      itojun   1090:        ((struct ip *)ui)->ip_len = htons(sizeof (struct udpiphdr) + len);
1.1       cgd      1091:        ((struct ip *)ui)->ip_ttl = inp->inp_ip.ip_ttl; /* XXX */
                   1092:        ((struct ip *)ui)->ip_tos = inp->inp_ip.ip_tos; /* XXX */
                   1093:        udpstat.udps_opackets++;
1.48      itojun   1094:
1.125     thorpej  1095:        return (ip_output(m, inp->inp_options, ro,
1.12      mycroft  1096:            inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST),
1.107     itojun   1097:            inp->inp_moptions, inp->inp_socket));
1.1       cgd      1098:
                   1099: release:
                   1100:        m_freem(m);
                   1101:        return (error);
                   1102: }
                   1103:
1.42      thorpej  1104: int    udp_sendspace = 9216;           /* really max datagram size */
                   1105: int    udp_recvspace = 40 * (1024 + sizeof(struct sockaddr_in));
1.1       cgd      1106:                                        /* 40 1K datagrams */
                   1107:
                   1108: /*ARGSUSED*/
1.7       mycroft  1109: int
1.119     matt     1110: udp_usrreq(struct socket *so, int req, struct mbuf *m, struct mbuf *nam,
                   1111:        struct mbuf *control, struct proc *p)
1.1       cgd      1112: {
1.66      augustss 1113:        struct inpcb *inp;
1.1       cgd      1114:        int s;
1.66      augustss 1115:        int error = 0;
1.1       cgd      1116:
                   1117:        if (req == PRU_CONTROL)
1.31      mycroft  1118:                return (in_control(so, (long)m, (caddr_t)nam,
1.30      mycroft  1119:                    (struct ifnet *)control, p));
1.59      thorpej  1120:
1.60      thorpej  1121:        if (req == PRU_PURGEIF) {
1.80      itojun   1122:                in_pcbpurgeif0(&udbtable, (struct ifnet *)control);
1.60      thorpej  1123:                in_purgeif((struct ifnet *)control);
                   1124:                in_pcbpurgeif(&udbtable, (struct ifnet *)control);
1.59      thorpej  1125:                return (0);
                   1126:        }
1.31      mycroft  1127:
                   1128:        s = splsoftnet();
                   1129:        inp = sotoinpcb(so);
1.32      mycroft  1130: #ifdef DIAGNOSTIC
                   1131:        if (req != PRU_SEND && req != PRU_SENDOOB && control)
                   1132:                panic("udp_usrreq: unexpected control mbuf");
                   1133: #endif
1.31      mycroft  1134:        if (inp == 0 && req != PRU_ATTACH) {
                   1135:                error = EINVAL;
                   1136:                goto release;
                   1137:        }
                   1138:
1.1       cgd      1139:        /*
                   1140:         * Note: need to block udp_input while changing
                   1141:         * the udp pcb queue and/or pcb addresses.
                   1142:         */
                   1143:        switch (req) {
                   1144:
                   1145:        case PRU_ATTACH:
1.31      mycroft  1146:                if (inp != 0) {
                   1147:                        error = EISCONN;
1.1       cgd      1148:                        break;
                   1149:                }
1.98      matt     1150: #ifdef MBUFTRACE
                   1151:                so->so_mowner = &udp_mowner;
                   1152:                so->so_rcv.sb_mowner = &udp_rx_mowner;
                   1153:                so->so_snd.sb_mowner = &udp_tx_mowner;
                   1154: #endif
1.31      mycroft  1155:                if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
                   1156:                        error = soreserve(so, udp_sendspace, udp_recvspace);
                   1157:                        if (error)
                   1158:                                break;
                   1159:                }
1.18      mycroft  1160:                error = in_pcballoc(so, &udbtable);
1.1       cgd      1161:                if (error)
                   1162:                        break;
1.31      mycroft  1163:                inp = sotoinpcb(so);
                   1164:                inp->inp_ip.ip_ttl = ip_defttl;
1.1       cgd      1165:                break;
                   1166:
                   1167:        case PRU_DETACH:
1.31      mycroft  1168:                in_pcbdetach(inp);
1.1       cgd      1169:                break;
                   1170:
                   1171:        case PRU_BIND:
1.31      mycroft  1172:                error = in_pcbbind(inp, nam, p);
1.1       cgd      1173:                break;
                   1174:
                   1175:        case PRU_LISTEN:
                   1176:                error = EOPNOTSUPP;
                   1177:                break;
                   1178:
                   1179:        case PRU_CONNECT:
1.31      mycroft  1180:                error = in_pcbconnect(inp, nam);
                   1181:                if (error)
1.1       cgd      1182:                        break;
1.31      mycroft  1183:                soisconnected(so);
1.1       cgd      1184:                break;
                   1185:
                   1186:        case PRU_CONNECT2:
                   1187:                error = EOPNOTSUPP;
                   1188:                break;
                   1189:
                   1190:        case PRU_DISCONNECT:
1.31      mycroft  1191:                /*soisdisconnected(so);*/
                   1192:                so->so_state &= ~SS_ISCONNECTED;        /* XXX */
1.1       cgd      1193:                in_pcbdisconnect(inp);
1.34      mycroft  1194:                inp->inp_laddr = zeroin_addr;           /* XXX */
1.35      mycroft  1195:                in_pcbstate(inp, INP_BOUND);            /* XXX */
1.1       cgd      1196:                break;
                   1197:
                   1198:        case PRU_SHUTDOWN:
                   1199:                socantsendmore(so);
                   1200:                break;
                   1201:
1.31      mycroft  1202:        case PRU_RCVD:
                   1203:                error = EOPNOTSUPP;
1.1       cgd      1204:                break;
                   1205:
1.31      mycroft  1206:        case PRU_SEND:
1.32      mycroft  1207:                if (control && control->m_len) {
                   1208:                        m_freem(control);
                   1209:                        m_freem(m);
                   1210:                        error = EINVAL;
                   1211:                        break;
                   1212:                }
1.31      mycroft  1213:        {
1.35      mycroft  1214:                struct in_addr laddr;                   /* XXX */
1.1       cgd      1215:
1.31      mycroft  1216:                if (nam) {
1.35      mycroft  1217:                        laddr = inp->inp_laddr;         /* XXX */
1.31      mycroft  1218:                        if ((so->so_state & SS_ISCONNECTED) != 0) {
                   1219:                                error = EISCONN;
1.32      mycroft  1220:                                goto die;
1.31      mycroft  1221:                        }
                   1222:                        error = in_pcbconnect(inp, nam);
1.100     matt     1223:                        if (error)
                   1224:                                goto die;
1.31      mycroft  1225:                } else {
                   1226:                        if ((so->so_state & SS_ISCONNECTED) == 0) {
                   1227:                                error = ENOTCONN;
1.32      mycroft  1228:                                goto die;
1.31      mycroft  1229:                        }
                   1230:                }
1.33      mycroft  1231:                error = udp_output(m, inp);
1.100     matt     1232:                m = NULL;
1.31      mycroft  1233:                if (nam) {
                   1234:                        in_pcbdisconnect(inp);
1.35      mycroft  1235:                        inp->inp_laddr = laddr;         /* XXX */
                   1236:                        in_pcbstate(inp, INP_BOUND);    /* XXX */
1.31      mycroft  1237:                }
1.100     matt     1238:          die:
                   1239:                if (m)
                   1240:                        m_freem(m);
1.31      mycroft  1241:        }
1.1       cgd      1242:                break;
                   1243:
                   1244:        case PRU_SENSE:
                   1245:                /*
                   1246:                 * stat: don't bother with a blocksize.
                   1247:                 */
1.31      mycroft  1248:                splx(s);
1.1       cgd      1249:                return (0);
                   1250:
1.31      mycroft  1251:        case PRU_RCVOOB:
                   1252:                error =  EOPNOTSUPP;
                   1253:                break;
                   1254:
1.1       cgd      1255:        case PRU_SENDOOB:
1.32      mycroft  1256:                m_freem(control);
1.31      mycroft  1257:                m_freem(m);
1.1       cgd      1258:                error =  EOPNOTSUPP;
                   1259:                break;
                   1260:
1.31      mycroft  1261:        case PRU_SOCKADDR:
                   1262:                in_setsockaddr(inp, nam);
                   1263:                break;
                   1264:
                   1265:        case PRU_PEERADDR:
                   1266:                in_setpeeraddr(inp, nam);
                   1267:                break;
1.1       cgd      1268:
                   1269:        default:
                   1270:                panic("udp_usrreq");
                   1271:        }
                   1272:
                   1273: release:
1.31      mycroft  1274:        splx(s);
1.1       cgd      1275:        return (error);
1.13      mycroft  1276: }
                   1277:
                   1278: /*
                   1279:  * Sysctl for udp variables.
                   1280:  */
1.114     atatat   1281: SYSCTL_SETUP(sysctl_net_inet_udp_setup, "sysctl net.inet.udp subtree setup")
1.13      mycroft  1282: {
1.114     atatat   1283:
1.116     atatat   1284:        sysctl_createv(clog, 0, NULL, NULL,
                   1285:                       CTLFLAG_PERMANENT,
1.114     atatat   1286:                       CTLTYPE_NODE, "net", NULL,
                   1287:                       NULL, 0, NULL, 0,
                   1288:                       CTL_NET, CTL_EOL);
1.116     atatat   1289:        sysctl_createv(clog, 0, NULL, NULL,
                   1290:                       CTLFLAG_PERMANENT,
1.114     atatat   1291:                       CTLTYPE_NODE, "inet", NULL,
                   1292:                       NULL, 0, NULL, 0,
                   1293:                       CTL_NET, PF_INET, CTL_EOL);
1.116     atatat   1294:        sysctl_createv(clog, 0, NULL, NULL,
                   1295:                       CTLFLAG_PERMANENT,
1.122     atatat   1296:                       CTLTYPE_NODE, "udp",
                   1297:                       SYSCTL_DESCR("UDPv4 related settings"),
1.114     atatat   1298:                       NULL, 0, NULL, 0,
                   1299:                       CTL_NET, PF_INET, IPPROTO_UDP, CTL_EOL);
                   1300:
1.116     atatat   1301:        sysctl_createv(clog, 0, NULL, NULL,
                   1302:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.122     atatat   1303:                       CTLTYPE_INT, "checksum",
1.123     heas     1304:                       SYSCTL_DESCR("Compute UDP checksums"),
1.114     atatat   1305:                       NULL, 0, &udpcksum, 0,
                   1306:                       CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_CHECKSUM,
                   1307:                       CTL_EOL);
1.116     atatat   1308:        sysctl_createv(clog, 0, NULL, NULL,
                   1309:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.122     atatat   1310:                       CTLTYPE_INT, "sendspace",
                   1311:                       SYSCTL_DESCR("Default UDP send buffer size"),
1.114     atatat   1312:                       NULL, 0, &udp_sendspace, 0,
                   1313:                       CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_SENDSPACE,
                   1314:                       CTL_EOL);
1.116     atatat   1315:        sysctl_createv(clog, 0, NULL, NULL,
                   1316:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.122     atatat   1317:                       CTLTYPE_INT, "recvspace",
                   1318:                       SYSCTL_DESCR("Default UDP receive buffer size"),
1.114     atatat   1319:                       NULL, 0, &udp_recvspace, 0,
                   1320:                       CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_RECVSPACE,
                   1321:                       CTL_EOL);
1.125     thorpej  1322:        sysctl_createv(clog, 0, NULL, NULL,
                   1323:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1324:                       CTLTYPE_INT, "do_loopback_cksum",
                   1325:                       SYSCTL_DESCR("Perform UDP checksum on loopback"),
                   1326:                       NULL, 0, &udp_do_loopback_cksum, 0,
                   1327:                       CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_LOOPBACKCKSUM,
                   1328:                       CTL_EOL);
1.132     atatat   1329:        sysctl_createv(clog, 0, NULL, NULL,
                   1330:                       CTLFLAG_PERMANENT,
1.134     atatat   1331:                       CTLTYPE_STRUCT, "pcblist",
1.132     atatat   1332:                       SYSCTL_DESCR("UDP protocol control block list"),
                   1333:                       sysctl_inpcblist, 0, &udbtable, 0,
                   1334:                       CTL_NET, PF_INET, IPPROTO_UDP, CTL_CREATE,
                   1335:                       CTL_EOL);
1.1       cgd      1336: }
1.72      itojun   1337: #endif
1.130     manu     1338:
                   1339: #if (defined INET && defined IPSEC_NAT_T)
                   1340: /*
                   1341:  * Returns:
                   1342:  * 1 if the packet was processed
                   1343:  * 0 if normal UDP processing should take place
                   1344:  */
                   1345: static int
                   1346: udp4_espinudp(m, off, src, so)
                   1347:        struct mbuf *m;
                   1348:        int off;
                   1349:        struct sockaddr *src;
                   1350:        struct socket *so;
                   1351: {
                   1352:        size_t len;
                   1353:        caddr_t data;
                   1354:        struct inpcb *inp;
                   1355:        size_t skip = 0;
                   1356:        size_t minlen;
                   1357:        size_t iphdrlen;
                   1358:        struct ip *ip;
                   1359:        struct mbuf *n;
1.136     manu     1360:        struct m_tag *tag;
                   1361:        struct udphdr *udphdr;
                   1362:        u_int16_t sport, dport;
1.130     manu     1363:
1.131     perry    1364:        /*
1.130     manu     1365:         * Collapse the mbuf chain if the first mbuf is too short
                   1366:         * The longest case is: UDP + non ESP marker + ESP
                   1367:         */
                   1368:        minlen = off + sizeof(u_int64_t) + sizeof(struct esp);
                   1369:        if (minlen > m->m_pkthdr.len)
                   1370:                minlen = m->m_pkthdr.len;
                   1371:
                   1372:        if (m->m_len < minlen) {
                   1373:                if ((m = m_pullup(m, minlen)) == NULL) {
                   1374:                        printf("udp4_espinudp: m_pullup failed\n");
                   1375:                        return 0;
                   1376:                }
                   1377:        }
                   1378:
1.131     perry    1379:        len = m->m_len - off;
1.130     manu     1380:        data = mtod(m, caddr_t) + off;
                   1381:        inp = sotoinpcb(so);
                   1382:
                   1383:        /* Ignore keepalive packets */
                   1384:        if ((len == 1) && (data[0] == '\xff')) {
                   1385:                return 1;
                   1386:        }
                   1387:
1.131     perry    1388:        /*
                   1389:         * Check that the payload is long enough to hold
1.130     manu     1390:         * an ESP header and compute the length of encapsulation
1.131     perry    1391:         * header to remove
1.130     manu     1392:         */
                   1393:        if (inp->inp_flags & INP_ESPINUDP) {
                   1394:                u_int32_t *st = (u_int32_t *)data;
                   1395:
                   1396:                if ((len <= sizeof(struct esp)) || (*st == 0))
                   1397:                        return 0; /* Normal UDP processing */
                   1398:
                   1399:                skip = sizeof(struct udphdr);
                   1400:        }
                   1401:
                   1402:        if (inp->inp_flags & INP_ESPINUDP_NON_IKE) {
                   1403:                u_int64_t *st = (u_int64_t *)data;
                   1404:
                   1405:                if ((len <= sizeof(u_int64_t) + sizeof(struct esp))
                   1406:                    || (*st != 0))
                   1407:                        return 0; /* Normal UDP processing */
1.131     perry    1408:
1.130     manu     1409:                skip = sizeof(struct udphdr) + sizeof(u_int64_t);
                   1410:        }
                   1411:
                   1412:        /*
1.136     manu     1413:         * Get the UDP ports. They are handled in network
                   1414:         * order everywhere in IPSEC_NAT_T code.
                   1415:         */
                   1416:        udphdr = (struct udphdr *)(data - skip);
                   1417:        sport = udphdr->uh_sport;
                   1418:        dport = udphdr->uh_dport;
                   1419:
                   1420:        /*
1.130     manu     1421:         * Remove the UDP header (and possibly the non ESP marker)
                   1422:         * IP header lendth is iphdrlen
1.131     perry    1423:         * Before:
1.130     manu     1424:         *   <--- off --->
                   1425:         *   +----+------+-----+
                   1426:         *   | IP |  UDP | ESP |
                   1427:         *   +----+------+-----+
                   1428:         *        <-skip->
                   1429:         * After:
                   1430:         *          +----+-----+
                   1431:         *          | IP | ESP |
                   1432:         *          +----+-----+
                   1433:         *   <-skip->
                   1434:         */
                   1435:        iphdrlen = off - sizeof(struct udphdr);
                   1436:        memmove(mtod(m, caddr_t) + skip, mtod(m, caddr_t), iphdrlen);
                   1437:        m_adj(m, skip);
                   1438:
                   1439:        ip = mtod(m, struct ip *);
                   1440:        ip->ip_len = htons(ntohs(ip->ip_len) - skip);
                   1441:        ip->ip_p = IPPROTO_ESP;
                   1442:
                   1443:        /*
1.131     perry    1444:         * Copy the mbuf to avoid multiple free, as both
                   1445:         * esp4_input (which we call) and udp_input (which
1.130     manu     1446:         * called us) free the mbuf.
                   1447:         */
                   1448:        if ((n = m_dup(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
                   1449:                printf("udp4_espinudp: m_dup failed\n");
                   1450:                return 0;
                   1451:        }
                   1452:
1.136     manu     1453:        /*
                   1454:         * Add a PACKET_TAG_IPSEC_NAT_T_PORT tag to remember
                   1455:         * the source UDP port. This is required if we want
                   1456:         * to select the right SPD for multiple hosts behind
                   1457:         * same NAT
                   1458:         */
1.137   ! manu     1459:        if ((tag = m_tag_get(PACKET_TAG_IPSEC_NAT_T_PORTS,
        !          1460:            sizeof(sport) + sizeof(dport), M_DONTWAIT)) == NULL) {
        !          1461:                printf("udp4_espinudp: m_tag_get failed\n");
        !          1462:                return 0;
        !          1463:        }
1.136     manu     1464:        ((u_int16_t *)(tag + 1))[0] = sport;
                   1465:        ((u_int16_t *)(tag + 1))[1] = dport;
                   1466:        m_tag_prepend(n, tag);
                   1467:
1.130     manu     1468:        esp4_input(n, iphdrlen);
                   1469:
                   1470:        /* We handled it, it shoudln't be handled by UDP */
                   1471:        return 1;
                   1472: }
                   1473: #endif

CVSweb <webmaster@jp.NetBSD.org>