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Annotation of src/sys/netinet/udp_usrreq.c, Revision 1.127

1.127   ! yamt        1: /*     $NetBSD: udp_usrreq.c,v 1.126 2004/12/17 22:54:52 christos Exp $        */
1.48      itojun      2:
                      3: /*
                      4:  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
                      5:  * All rights reserved.
1.94      itojun      6:  *
1.48      itojun      7:  * Redistribution and use in source and binary forms, with or without
                      8:  * modification, are permitted provided that the following conditions
                      9:  * are met:
                     10:  * 1. Redistributions of source code must retain the above copyright
                     11:  *    notice, this list of conditions and the following disclaimer.
                     12:  * 2. Redistributions in binary form must reproduce the above copyright
                     13:  *    notice, this list of conditions and the following disclaimer in the
                     14:  *    documentation and/or other materials provided with the distribution.
                     15:  * 3. Neither the name of the project nor the names of its contributors
                     16:  *    may be used to endorse or promote products derived from this software
                     17:  *    without specific prior written permission.
1.94      itojun     18:  *
1.48      itojun     19:  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
                     20:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     21:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     22:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
                     23:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     24:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     25:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     26:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     27:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     28:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     29:  * SUCH DAMAGE.
                     30:  */
1.14      cgd        31:
1.1       cgd        32: /*
1.44      thorpej    33:  * Copyright (c) 1982, 1986, 1988, 1990, 1993, 1995
1.13      mycroft    34:  *     The Regents of the University of California.  All rights reserved.
1.1       cgd        35:  *
                     36:  * Redistribution and use in source and binary forms, with or without
                     37:  * modification, are permitted provided that the following conditions
                     38:  * are met:
                     39:  * 1. Redistributions of source code must retain the above copyright
                     40:  *    notice, this list of conditions and the following disclaimer.
                     41:  * 2. Redistributions in binary form must reproduce the above copyright
                     42:  *    notice, this list of conditions and the following disclaimer in the
                     43:  *    documentation and/or other materials provided with the distribution.
1.104     agc        44:  * 3. Neither the name of the University nor the names of its contributors
1.1       cgd        45:  *    may be used to endorse or promote products derived from this software
                     46:  *    without specific prior written permission.
                     47:  *
                     48:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     49:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     50:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     51:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     52:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     53:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     54:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     55:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     56:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     57:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     58:  * SUCH DAMAGE.
                     59:  *
1.44      thorpej    60:  *     @(#)udp_usrreq.c        8.6 (Berkeley) 5/23/95
1.1       cgd        61:  */
1.91      lukem      62:
                     63: #include <sys/cdefs.h>
1.127   ! yamt       64: __KERNEL_RCSID(0, "$NetBSD: udp_usrreq.c,v 1.126 2004/12/17 22:54:52 christos 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:
1.53      itojun     98: #ifdef INET6
                     99: #include <netinet/ip6.h>
                    100: #include <netinet/icmp6.h>
                    101: #include <netinet6/ip6_var.h>
                    102: #include <netinet6/in6_pcb.h>
                    103: #include <netinet6/udp6_var.h>
                    104: #endif
                    105:
                    106: #ifndef INET6
                    107: /* always need ip6.h for IP6_EXTHDR_GET */
                    108: #include <netinet/ip6.h>
                    109: #endif
                    110:
1.76      itojun    111: #include "faith.h"
                    112: #if defined(NFAITH) && NFAITH > 0
                    113: #include <net/if_faith.h>
                    114: #endif
                    115:
1.27      christos  116: #include <machine/stdarg.h>
                    117:
1.105     jonathan  118: #ifdef FAST_IPSEC
                    119: #include <netipsec/ipsec.h>
1.121     jonathan  120: #include <netipsec/ipsec_var.h>                        /* XXX ipsecstat namespace */
1.105     jonathan  121: #ifdef INET6
                    122: #include <netipsec/ipsec6.h>
                    123: #endif
                    124: #endif /* FAST_IPSEC*/
                    125:
1.48      itojun    126: #ifdef IPSEC
                    127: #include <netinet6/ipsec.h>
                    128: #include <netkey/key.h>
                    129: #endif /*IPSEC*/
                    130:
1.64      ws        131: #ifdef IPKDB
                    132: #include <ipkdb/ipkdb.h>
                    133: #endif
                    134:
1.8       mycroft   135: /*
                    136:  * UDP protocol implementation.
                    137:  * Per RFC 768, August, 1980.
                    138:  */
                    139: #ifndef        COMPAT_42
                    140: int    udpcksum = 1;
                    141: #else
                    142: int    udpcksum = 0;           /* XXX */
                    143: #endif
1.126     christos  144: int    udp_do_loopback_cksum = 1;
1.93      matt      145:
                    146: struct inpcbtable udbtable;
                    147: struct udpstat udpstat;
1.8       mycroft   148:
1.72      itojun    149: #ifdef INET
1.119     matt      150: static void udp4_sendup (struct mbuf *, int, struct sockaddr *,
                    151:        struct socket *);
                    152: static int udp4_realinput (struct sockaddr_in *, struct sockaddr_in *,
                    153:        struct mbuf *, int);
1.72      itojun    154: #endif
1.53      itojun    155: #ifdef INET6
1.119     matt      156: static void udp6_sendup (struct mbuf *, int, struct sockaddr *,
                    157:        struct socket *);
                    158: static int udp6_realinput (int, struct sockaddr_in6 *,
                    159:        struct sockaddr_in6 *, struct mbuf *, int);
1.53      itojun    160: #endif
1.72      itojun    161: #ifdef INET
1.119     matt      162: static void udp_notify (struct inpcb *, int);
1.72      itojun    163: #endif
1.7       mycroft   164:
1.26      mycroft   165: #ifndef UDBHASHSIZE
                    166: #define        UDBHASHSIZE     128
                    167: #endif
                    168: int    udbhashsize = UDBHASHSIZE;
                    169:
1.98      matt      170: #ifdef MBUFTRACE
                    171: struct mowner udp_mowner = { "udp" };
                    172: struct mowner udp_rx_mowner = { "udp", "rx" };
                    173: struct mowner udp_tx_mowner = { "udp", "tx" };
                    174: #endif
                    175:
1.78      thorpej   176: #ifdef UDP_CSUM_COUNTERS
                    177: #include <sys/device.h>
                    178:
                    179: struct evcnt udp_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    180:     NULL, "udp", "hwcsum bad");
                    181: struct evcnt udp_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    182:     NULL, "udp", "hwcsum ok");
                    183: struct evcnt udp_hwcsum_data = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    184:     NULL, "udp", "hwcsum data");
                    185: struct evcnt udp_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    186:     NULL, "udp", "swcsum");
                    187:
                    188: #define        UDP_CSUM_COUNTER_INCR(ev)       (ev)->ev_count++
                    189:
1.120     matt      190: EVCNT_ATTACH_STATIC(udp_hwcsum_bad);
                    191: EVCNT_ATTACH_STATIC(udp_hwcsum_ok);
                    192: EVCNT_ATTACH_STATIC(udp_hwcsum_data);
                    193: EVCNT_ATTACH_STATIC(udp_swcsum);
                    194:
1.78      thorpej   195: #else
                    196:
                    197: #define        UDP_CSUM_COUNTER_INCR(ev)       /* nothing */
                    198:
                    199: #endif /* UDP_CSUM_COUNTERS */
                    200:
1.7       mycroft   201: void
1.119     matt      202: udp_init(void)
1.1       cgd       203: {
1.18      mycroft   204:
1.35      mycroft   205:        in_pcbinit(&udbtable, udbhashsize, udbhashsize);
1.78      thorpej   206:
1.98      matt      207:        MOWNER_ATTACH(&udp_tx_mowner);
                    208:        MOWNER_ATTACH(&udp_rx_mowner);
                    209:        MOWNER_ATTACH(&udp_mowner);
1.1       cgd       210: }
                    211:
1.72      itojun    212: #ifdef INET
1.7       mycroft   213: void
1.27      christos  214: udp_input(struct mbuf *m, ...)
1.1       cgd       215: {
1.53      itojun    216:        va_list ap;
                    217:        struct sockaddr_in src, dst;
                    218:        struct ip *ip;
                    219:        struct udphdr *uh;
1.97      simonb    220:        int iphlen;
1.53      itojun    221:        int len;
                    222:        int n;
1.96      itojun    223:        u_int16_t ip_len;
1.53      itojun    224:
                    225:        va_start(ap, m);
                    226:        iphlen = va_arg(ap, int);
1.97      simonb    227:        (void)va_arg(ap, int);          /* ignore value, advance ap */
1.53      itojun    228:        va_end(ap);
                    229:
1.98      matt      230:        MCLAIM(m, &udp_rx_mowner);
1.53      itojun    231:        udpstat.udps_ipackets++;
                    232:
                    233:        /*
                    234:         * Get IP and UDP header together in first mbuf.
                    235:         */
                    236:        ip = mtod(m, struct ip *);
                    237:        IP6_EXTHDR_GET(uh, struct udphdr *, m, iphlen, sizeof(struct udphdr));
                    238:        if (uh == NULL) {
                    239:                udpstat.udps_hdrops++;
                    240:                return;
                    241:        }
1.95      thorpej   242:        KASSERT(UDP_HDR_ALIGNED_P(uh));
1.53      itojun    243:
1.57      itojun    244:        /* destination port of 0 is illegal, based on RFC768. */
                    245:        if (uh->uh_dport == 0)
                    246:                goto bad;
                    247:
1.53      itojun    248:        /*
                    249:         * Make mbuf data length reflect UDP length.
                    250:         * If not enough data to reflect UDP length, drop.
                    251:         */
1.96      itojun    252:        ip_len = ntohs(ip->ip_len);
1.53      itojun    253:        len = ntohs((u_int16_t)uh->uh_ulen);
1.96      itojun    254:        if (ip_len != iphlen + len) {
                    255:                if (ip_len < iphlen + len || len < sizeof(struct udphdr)) {
1.53      itojun    256:                        udpstat.udps_badlen++;
                    257:                        goto bad;
                    258:                }
1.96      itojun    259:                m_adj(m, iphlen + len - ip_len);
1.53      itojun    260:        }
                    261:
                    262:        /*
                    263:         * Checksum extended UDP header and data.
                    264:         */
                    265:        if (uh->uh_sum) {
1.78      thorpej   266:                switch (m->m_pkthdr.csum_flags &
1.112     enami     267:                    ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_UDPv4) |
                    268:                    M_CSUM_TCP_UDP_BAD | M_CSUM_DATA)) {
1.78      thorpej   269:                case M_CSUM_UDPv4|M_CSUM_TCP_UDP_BAD:
                    270:                        UDP_CSUM_COUNTER_INCR(&udp_hwcsum_bad);
                    271:                        goto badcsum;
                    272:
1.106     jonathan  273:                case M_CSUM_UDPv4|M_CSUM_DATA: {
                    274:                        u_int32_t hw_csum = m->m_pkthdr.csum_data;
1.78      thorpej   275:                        UDP_CSUM_COUNTER_INCR(&udp_hwcsum_data);
1.106     jonathan  276:                        if (m->m_pkthdr.csum_flags & M_CSUM_NO_PSEUDOHDR)
1.112     enami     277:                                hw_csum = in_cksum_phdr(ip->ip_src.s_addr,
                    278:                                    ip->ip_dst.s_addr,
1.115     drochner  279:                                    htons(hw_csum + len + IPPROTO_UDP));
1.106     jonathan  280:                        if ((hw_csum ^ 0xffff) != 0)
1.78      thorpej   281:                                goto badcsum;
                    282:                        break;
1.106     jonathan  283:                }
1.78      thorpej   284:
                    285:                case M_CSUM_UDPv4:
                    286:                        /* Checksum was okay. */
                    287:                        UDP_CSUM_COUNTER_INCR(&udp_hwcsum_ok);
                    288:                        break;
                    289:
                    290:                default:
1.125     thorpej   291:                        /*
                    292:                         * Need to compute it ourselves.  Maybe skip checksum
                    293:                         * on loopback interfaces.
                    294:                         */
                    295:                        if (__predict_true(!(m->m_pkthdr.rcvif->if_flags &
                    296:                                             IFF_LOOPBACK) ||
                    297:                                           udp_do_loopback_cksum)) {
                    298:                                UDP_CSUM_COUNTER_INCR(&udp_swcsum);
                    299:                                if (in4_cksum(m, IPPROTO_UDP, iphlen, len) != 0)
                    300:                                        goto badcsum;
                    301:                        }
1.78      thorpej   302:                        break;
1.53      itojun    303:                }
                    304:        }
                    305:
                    306:        /* construct source and dst sockaddrs. */
                    307:        bzero(&src, sizeof(src));
                    308:        src.sin_family = AF_INET;
                    309:        src.sin_len = sizeof(struct sockaddr_in);
                    310:        bcopy(&ip->ip_src, &src.sin_addr, sizeof(src.sin_addr));
                    311:        src.sin_port = uh->uh_sport;
                    312:        bzero(&dst, sizeof(dst));
                    313:        dst.sin_family = AF_INET;
                    314:        dst.sin_len = sizeof(struct sockaddr_in);
                    315:        bcopy(&ip->ip_dst, &dst.sin_addr, sizeof(dst.sin_addr));
                    316:        dst.sin_port = uh->uh_dport;
                    317:
                    318:        n = udp4_realinput(&src, &dst, m, iphlen);
                    319: #ifdef INET6
                    320:        if (IN_MULTICAST(ip->ip_dst.s_addr) || n == 0) {
                    321:                struct sockaddr_in6 src6, dst6;
                    322:
                    323:                bzero(&src6, sizeof(src6));
                    324:                src6.sin6_family = AF_INET6;
                    325:                src6.sin6_len = sizeof(struct sockaddr_in6);
                    326:                src6.sin6_addr.s6_addr[10] = src6.sin6_addr.s6_addr[11] = 0xff;
                    327:                bcopy(&ip->ip_src, &src6.sin6_addr.s6_addr[12],
                    328:                        sizeof(ip->ip_src));
                    329:                src6.sin6_port = uh->uh_sport;
                    330:                bzero(&dst6, sizeof(dst6));
                    331:                dst6.sin6_family = AF_INET6;
                    332:                dst6.sin6_len = sizeof(struct sockaddr_in6);
                    333:                dst6.sin6_addr.s6_addr[10] = dst6.sin6_addr.s6_addr[11] = 0xff;
                    334:                bcopy(&ip->ip_dst, &dst6.sin6_addr.s6_addr[12],
                    335:                        sizeof(ip->ip_dst));
                    336:                dst6.sin6_port = uh->uh_dport;
                    337:
                    338:                n += udp6_realinput(AF_INET, &src6, &dst6, m, iphlen);
                    339:        }
                    340: #endif
                    341:
                    342:        if (n == 0) {
                    343:                if (m->m_flags & (M_BCAST | M_MCAST)) {
                    344:                        udpstat.udps_noportbcast++;
                    345:                        goto bad;
                    346:                }
1.61      itojun    347:                udpstat.udps_noport++;
1.64      ws        348: #ifdef IPKDB
1.53      itojun    349:                if (checkipkdb(&ip->ip_src, uh->uh_sport, uh->uh_dport,
                    350:                                m, iphlen + sizeof(struct udphdr),
                    351:                                m->m_pkthdr.len - iphlen - sizeof(struct udphdr))) {
                    352:                        /*
                    353:                         * It was a debugger connect packet,
                    354:                         * just drop it now
                    355:                         */
                    356:                        goto bad;
                    357:                }
                    358: #endif
                    359:                icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0);
                    360:                m = NULL;
                    361:        }
                    362:
                    363: bad:
                    364:        if (m)
                    365:                m_freem(m);
1.78      thorpej   366:        return;
                    367:
                    368: badcsum:
                    369:        m_freem(m);
                    370:        udpstat.udps_badsum++;
1.53      itojun    371: }
1.72      itojun    372: #endif
1.53      itojun    373:
                    374: #ifdef INET6
                    375: int
1.119     matt      376: udp6_input(struct mbuf **mp, int *offp, int proto)
1.53      itojun    377: {
                    378:        struct mbuf *m = *mp;
                    379:        int off = *offp;
                    380:        struct sockaddr_in6 src, dst;
                    381:        struct ip6_hdr *ip6;
                    382:        struct udphdr *uh;
                    383:        u_int32_t plen, ulen;
                    384:
1.76      itojun    385:        ip6 = mtod(m, struct ip6_hdr *);
                    386:
1.53      itojun    387: #if defined(NFAITH) && 0 < NFAITH
1.76      itojun    388:        if (faithprefix(&ip6->ip6_dst)) {
                    389:                /* send icmp6 host unreach? */
                    390:                m_freem(m);
                    391:                return IPPROTO_DONE;
1.53      itojun    392:        }
                    393: #endif
                    394:
                    395:        udp6stat.udp6s_ipackets++;
                    396:
                    397:        /* check for jumbogram is done in ip6_input.  we can trust pkthdr.len */
                    398:        plen = m->m_pkthdr.len - off;
                    399:        IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(struct udphdr));
                    400:        if (uh == NULL) {
                    401:                ip6stat.ip6s_tooshort++;
                    402:                return IPPROTO_DONE;
                    403:        }
1.95      thorpej   404:        KASSERT(UDP_HDR_ALIGNED_P(uh));
1.53      itojun    405:        ulen = ntohs((u_short)uh->uh_ulen);
1.69      itojun    406:        /*
                    407:         * RFC2675 section 4: jumbograms will have 0 in the UDP header field,
                    408:         * iff payload length > 0xffff.
                    409:         */
1.53      itojun    410:        if (ulen == 0 && plen > 0xffff)
                    411:                ulen = plen;
                    412:
                    413:        if (plen != ulen) {
                    414:                udp6stat.udp6s_badlen++;
1.54      itojun    415:                goto bad;
                    416:        }
                    417:
1.57      itojun    418:        /* destination port of 0 is illegal, based on RFC768. */
                    419:        if (uh->uh_dport == 0)
                    420:                goto bad;
                    421:
1.54      itojun    422:        /* Be proactive about malicious use of IPv4 mapped address */
                    423:        if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
                    424:            IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
                    425:                /* XXX stat */
1.53      itojun    426:                goto bad;
                    427:        }
                    428:
                    429:        /*
1.125     thorpej   430:         * Checksum extended UDP header and data.  Maybe skip checksum
                    431:         * on loopback interfaces.
1.53      itojun    432:         */
1.127   ! yamt      433:        if (__predict_true((m->m_flags & M_LOOP) == 0 ||
        !           434:            udp_do_loopback_cksum)) {
1.125     thorpej   435:                if (uh->uh_sum == 0) {
                    436:                        udp6stat.udp6s_nosum++;
                    437:                        goto bad;
                    438:                }
                    439:                if (in6_cksum(m, IPPROTO_UDP, off, ulen) != 0) {
                    440:                        udp6stat.udp6s_badsum++;
                    441:                        goto bad;
                    442:                }
1.53      itojun    443:        }
                    444:
                    445:        /*
                    446:         * Construct source and dst sockaddrs.
                    447:         * Note that ifindex (s6_addr16[1]) is already filled.
                    448:         */
                    449:        bzero(&src, sizeof(src));
                    450:        src.sin6_family = AF_INET6;
                    451:        src.sin6_len = sizeof(struct sockaddr_in6);
1.69      itojun    452:        /* KAME hack: recover scopeid */
                    453:        (void)in6_recoverscope(&src, &ip6->ip6_src, m->m_pkthdr.rcvif);
1.53      itojun    454:        src.sin6_port = uh->uh_sport;
                    455:        bzero(&dst, sizeof(dst));
                    456:        dst.sin6_family = AF_INET6;
                    457:        dst.sin6_len = sizeof(struct sockaddr_in6);
1.69      itojun    458:        /* KAME hack: recover scopeid */
                    459:        (void)in6_recoverscope(&dst, &ip6->ip6_dst, m->m_pkthdr.rcvif);
1.53      itojun    460:        dst.sin6_port = uh->uh_dport;
                    461:
                    462:        if (udp6_realinput(AF_INET6, &src, &dst, m, off) == 0) {
                    463:                if (m->m_flags & M_MCAST) {
                    464:                        udp6stat.udp6s_noportmcast++;
                    465:                        goto bad;
                    466:                }
1.61      itojun    467:                udp6stat.udp6s_noport++;
1.53      itojun    468:                icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
                    469:                m = NULL;
                    470:        }
                    471:
                    472: bad:
                    473:        if (m)
                    474:                m_freem(m);
                    475:        return IPPROTO_DONE;
                    476: }
                    477: #endif
                    478:
1.72      itojun    479: #ifdef INET
1.53      itojun    480: static void
1.119     matt      481: udp4_sendup(struct mbuf *m, int off /* offset of data portion */,
                    482:        struct sockaddr *src, struct socket *so)
1.53      itojun    483: {
                    484:        struct mbuf *opts = NULL;
                    485:        struct mbuf *n;
                    486:        struct inpcb *inp = NULL;
                    487:
                    488:        if (!so)
                    489:                return;
                    490:        switch (so->so_proto->pr_domain->dom_family) {
                    491:        case AF_INET:
                    492:                inp = sotoinpcb(so);
                    493:                break;
                    494: #ifdef INET6
                    495:        case AF_INET6:
                    496:                break;
                    497: #endif
                    498:        default:
                    499:                return;
                    500:        }
                    501:
1.105     jonathan  502: #if defined(IPSEC) || defined(FAST_IPSEC)
1.53      itojun    503:        /* check AH/ESP integrity. */
                    504:        if (so != NULL && ipsec4_in_reject_so(m, so)) {
                    505:                ipsecstat.in_polvio++;
1.110     itojun    506:                if ((n = m_copy(m, 0, M_COPYALL)) != NULL)
                    507:                        icmp_error(n, ICMP_UNREACH, ICMP_UNREACH_ADMIN_PROHIBIT,
                    508:                            0, 0);
1.53      itojun    509:                return;
                    510:        }
                    511: #endif /*IPSEC*/
                    512:
                    513:        if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
                    514:                if (inp && (inp->inp_flags & INP_CONTROLOPTS
                    515:                         || so->so_options & SO_TIMESTAMP)) {
                    516:                        struct ip *ip = mtod(n, struct ip *);
                    517:                        ip_savecontrol(inp, &opts, ip, n);
                    518:                }
                    519:
                    520:                m_adj(n, off);
                    521:                if (sbappendaddr(&so->so_rcv, src, n,
                    522:                                opts) == 0) {
                    523:                        m_freem(n);
                    524:                        if (opts)
                    525:                                m_freem(opts);
1.124     darrenr   526:                        so->so_rcv.sb_overflowed++;
1.81      enami     527:                        udpstat.udps_fullsock++;
1.53      itojun    528:                } else
                    529:                        sorwakeup(so);
                    530:        }
                    531: }
1.72      itojun    532: #endif
1.53      itojun    533:
                    534: #ifdef INET6
                    535: static void
1.119     matt      536: udp6_sendup(struct mbuf *m, int off /* offset of data portion */,
                    537:        struct sockaddr *src, struct socket *so)
1.53      itojun    538: {
                    539:        struct mbuf *opts = NULL;
                    540:        struct mbuf *n;
                    541:        struct in6pcb *in6p = NULL;
                    542:
                    543:        if (!so)
                    544:                return;
                    545:        if (so->so_proto->pr_domain->dom_family != AF_INET6)
                    546:                return;
                    547:        in6p = sotoin6pcb(so);
                    548:
1.105     jonathan  549: #if defined(IPSEC) || defined(FAST_IPSEC)
1.53      itojun    550:        /* check AH/ESP integrity. */
                    551:        if (so != NULL && ipsec6_in_reject_so(m, so)) {
                    552:                ipsec6stat.in_polvio++;
1.111     mycroft   553:                if ((n = m_copy(m, 0, M_COPYALL)) != NULL)
1.110     itojun    554:                        icmp6_error(n, ICMP6_DST_UNREACH,
                    555:                            ICMP6_DST_UNREACH_ADMIN, 0);
1.53      itojun    556:                return;
                    557:        }
                    558: #endif /*IPSEC*/
                    559:
                    560:        if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
                    561:                if (in6p && (in6p->in6p_flags & IN6P_CONTROLOPTS
                    562:                          || in6p->in6p_socket->so_options & SO_TIMESTAMP)) {
                    563:                        struct ip6_hdr *ip6 = mtod(n, struct ip6_hdr *);
                    564:                        ip6_savecontrol(in6p, &opts, ip6, n);
                    565:                }
                    566:
                    567:                m_adj(n, off);
                    568:                if (sbappendaddr(&so->so_rcv, src, n, opts) == 0) {
                    569:                        m_freem(n);
                    570:                        if (opts)
                    571:                                m_freem(opts);
1.124     darrenr   572:                        so->so_rcv.sb_overflowed++;
1.53      itojun    573:                        udp6stat.udp6s_fullsock++;
                    574:                } else
                    575:                        sorwakeup(so);
                    576:        }
                    577: }
                    578: #endif
                    579:
1.72      itojun    580: #ifdef INET
1.53      itojun    581: static int
1.119     matt      582: udp4_realinput(struct sockaddr_in *src, struct sockaddr_in *dst,
                    583:        struct mbuf *m, int off /* offset of udphdr */)
1.53      itojun    584: {
                    585:        u_int16_t *sport, *dport;
                    586:        int rcvcnt;
                    587:        struct in_addr *src4, *dst4;
1.109     itojun    588:        struct inpcb_hdr *inph;
1.53      itojun    589:        struct inpcb *inp;
                    590:
                    591:        rcvcnt = 0;
                    592:        off += sizeof(struct udphdr);   /* now, offset of payload */
                    593:
                    594:        if (src->sin_family != AF_INET || dst->sin_family != AF_INET)
                    595:                goto bad;
                    596:
                    597:        src4 = &src->sin_addr;
                    598:        sport = &src->sin_port;
                    599:        dst4 = &dst->sin_addr;
                    600:        dport = &dst->sin_port;
                    601:
1.73      itojun    602:        if (IN_MULTICAST(dst4->s_addr) ||
1.53      itojun    603:            in_broadcast(*dst4, m->m_pkthdr.rcvif)) {
                    604:                /*
                    605:                 * Deliver a multicast or broadcast datagram to *all* sockets
                    606:                 * for which the local and remote addresses and ports match
                    607:                 * those of the incoming datagram.  This allows more than
                    608:                 * one process to receive multi/broadcasts on the same port.
                    609:                 * (This really ought to be done for unicast datagrams as
                    610:                 * well, but that would cause problems with existing
                    611:                 * applications that open both address-specific sockets and
                    612:                 * a wildcard socket listening to the same port -- they would
                    613:                 * end up receiving duplicates of every unicast datagram.
                    614:                 * Those applications open the multiple sockets to overcome an
                    615:                 * inadequacy of the UDP socket interface, but for backwards
                    616:                 * compatibility we avoid the problem here rather than
                    617:                 * fixing the interface.  Maybe 4.5BSD will remedy this?)
                    618:                 */
                    619:
                    620:                /*
1.92      itojun    621:                 * KAME note: traditionally we dropped udpiphdr from mbuf here.
1.71      itojun    622:                 * we need udpiphdr for IPsec processing so we do that later.
1.53      itojun    623:                 */
                    624:                /*
                    625:                 * Locate pcb(s) for datagram.
                    626:                 */
1.109     itojun    627:                CIRCLEQ_FOREACH(inph, &udbtable.inpt_queue, inph_queue) {
                    628:                        inp = (struct inpcb *)inph;
                    629:                        if (inp->inp_af != AF_INET)
                    630:                                continue;
                    631:
1.53      itojun    632:                        if (inp->inp_lport != *dport)
                    633:                                continue;
                    634:                        if (!in_nullhost(inp->inp_laddr)) {
                    635:                                if (!in_hosteq(inp->inp_laddr, *dst4))
                    636:                                        continue;
                    637:                        }
                    638:                        if (!in_nullhost(inp->inp_faddr)) {
                    639:                                if (!in_hosteq(inp->inp_faddr, *src4) ||
                    640:                                    inp->inp_fport != *sport)
                    641:                                        continue;
                    642:                        }
                    643:
                    644:                        udp4_sendup(m, off, (struct sockaddr *)src,
                    645:                                inp->inp_socket);
                    646:                        rcvcnt++;
                    647:
                    648:                        /*
                    649:                         * Don't look for additional matches if this one does
                    650:                         * not have either the SO_REUSEPORT or SO_REUSEADDR
                    651:                         * socket options set.  This heuristic avoids searching
                    652:                         * through all pcbs in the common case of a non-shared
                    653:                         * port.  It assumes that an application will never
                    654:                         * clear these options after setting them.
                    655:                         */
                    656:                        if ((inp->inp_socket->so_options &
                    657:                            (SO_REUSEPORT|SO_REUSEADDR)) == 0)
                    658:                                break;
                    659:                }
                    660:        } else {
                    661:                /*
                    662:                 * Locate pcb for datagram.
                    663:                 */
                    664:                inp = in_pcblookup_connect(&udbtable, *src4, *sport, *dst4, *dport);
                    665:                if (inp == 0) {
                    666:                        ++udpstat.udps_pcbhashmiss;
                    667:                        inp = in_pcblookup_bind(&udbtable, *dst4, *dport);
1.82      itojun    668:                        if (inp == 0)
1.53      itojun    669:                                return rcvcnt;
                    670:                }
                    671:
                    672:                udp4_sendup(m, off, (struct sockaddr *)src, inp->inp_socket);
                    673:                rcvcnt++;
                    674:        }
                    675:
                    676: bad:
                    677:        return rcvcnt;
                    678: }
1.72      itojun    679: #endif
1.53      itojun    680:
                    681: #ifdef INET6
                    682: static int
1.119     matt      683: udp6_realinput(int af, struct sockaddr_in6 *src, struct sockaddr_in6 *dst,
                    684:        struct mbuf *m, int off)
1.53      itojun    685: {
1.79      itojun    686:        u_int16_t sport, dport;
1.53      itojun    687:        int rcvcnt;
1.79      itojun    688:        struct in6_addr src6, dst6;
                    689:        const struct in_addr *dst4;
1.109     itojun    690:        struct inpcb_hdr *inph;
1.53      itojun    691:        struct in6pcb *in6p;
                    692:
                    693:        rcvcnt = 0;
                    694:        off += sizeof(struct udphdr);   /* now, offset of payload */
                    695:
                    696:        if (af != AF_INET && af != AF_INET6)
                    697:                goto bad;
                    698:        if (src->sin6_family != AF_INET6 || dst->sin6_family != AF_INET6)
                    699:                goto bad;
                    700:
1.79      itojun    701:        in6_embedscope(&src6, src, NULL, NULL);
                    702:        sport = src->sin6_port;
                    703:        in6_embedscope(&dst6, dst, NULL, NULL);
                    704:        dport = dst->sin6_port;
1.88      itojun    705:        dst4 = (struct in_addr *)&dst->sin6_addr.s6_addr[12];
1.53      itojun    706:
1.79      itojun    707:        if (IN6_IS_ADDR_MULTICAST(&dst6) ||
                    708:            (af == AF_INET && IN_MULTICAST(dst4->s_addr))) {
1.53      itojun    709:                /*
                    710:                 * Deliver a multicast or broadcast datagram to *all* sockets
                    711:                 * for which the local and remote addresses and ports match
                    712:                 * those of the incoming datagram.  This allows more than
                    713:                 * one process to receive multi/broadcasts on the same port.
                    714:                 * (This really ought to be done for unicast datagrams as
                    715:                 * well, but that would cause problems with existing
                    716:                 * applications that open both address-specific sockets and
                    717:                 * a wildcard socket listening to the same port -- they would
                    718:                 * end up receiving duplicates of every unicast datagram.
                    719:                 * Those applications open the multiple sockets to overcome an
                    720:                 * inadequacy of the UDP socket interface, but for backwards
                    721:                 * compatibility we avoid the problem here rather than
                    722:                 * fixing the interface.  Maybe 4.5BSD will remedy this?)
                    723:                 */
                    724:
                    725:                /*
1.92      itojun    726:                 * KAME note: traditionally we dropped udpiphdr from mbuf here.
1.71      itojun    727:                 * we need udpiphdr for IPsec processing so we do that later.
1.53      itojun    728:                 */
                    729:                /*
                    730:                 * Locate pcb(s) for datagram.
                    731:                 */
1.109     itojun    732:                CIRCLEQ_FOREACH(inph, &udbtable.inpt_queue, inph_queue) {
                    733:                        in6p = (struct in6pcb *)inph;
                    734:                        if (in6p->in6p_af != AF_INET6)
                    735:                                continue;
                    736:
1.79      itojun    737:                        if (in6p->in6p_lport != dport)
1.53      itojun    738:                                continue;
                    739:                        if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) {
1.90      itojun    740:                                if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &dst6))
1.53      itojun    741:                                        continue;
1.92      itojun    742:                        } else {
1.79      itojun    743:                                if (IN6_IS_ADDR_V4MAPPED(&dst6) &&
1.85      itojun    744:                                    (in6p->in6p_flags & IN6P_IPV6_V6ONLY))
1.55      itojun    745:                                        continue;
                    746:                        }
1.53      itojun    747:                        if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
1.79      itojun    748:                                if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr,
                    749:                                    &src6) || in6p->in6p_fport != sport)
1.53      itojun    750:                                        continue;
1.92      itojun    751:                        } else {
1.79      itojun    752:                                if (IN6_IS_ADDR_V4MAPPED(&src6) &&
1.85      itojun    753:                                    (in6p->in6p_flags & IN6P_IPV6_V6ONLY))
1.55      itojun    754:                                        continue;
                    755:                        }
1.53      itojun    756:
                    757:                        udp6_sendup(m, off, (struct sockaddr *)src,
                    758:                                in6p->in6p_socket);
                    759:                        rcvcnt++;
                    760:
                    761:                        /*
                    762:                         * Don't look for additional matches if this one does
                    763:                         * not have either the SO_REUSEPORT or SO_REUSEADDR
                    764:                         * socket options set.  This heuristic avoids searching
                    765:                         * through all pcbs in the common case of a non-shared
                    766:                         * port.  It assumes that an application will never
                    767:                         * clear these options after setting them.
                    768:                         */
                    769:                        if ((in6p->in6p_socket->so_options &
                    770:                            (SO_REUSEPORT|SO_REUSEADDR)) == 0)
                    771:                                break;
                    772:                }
                    773:        } else {
                    774:                /*
                    775:                 * Locate pcb for datagram.
                    776:                 */
1.109     itojun    777:                in6p = in6_pcblookup_connect(&udbtable, &src6, sport,
1.79      itojun    778:                    &dst6, dport, 0);
1.53      itojun    779:                if (in6p == 0) {
                    780:                        ++udpstat.udps_pcbhashmiss;
1.109     itojun    781:                        in6p = in6_pcblookup_bind(&udbtable, &dst6, dport, 0);
1.82      itojun    782:                        if (in6p == 0)
1.53      itojun    783:                                return rcvcnt;
                    784:                }
                    785:
                    786:                udp6_sendup(m, off, (struct sockaddr *)src, in6p->in6p_socket);
                    787:                rcvcnt++;
                    788:        }
                    789:
                    790: bad:
                    791:        return rcvcnt;
                    792: }
                    793: #endif
1.1       cgd       794:
1.72      itojun    795: #ifdef INET
1.1       cgd       796: /*
                    797:  * Notify a udp user of an asynchronous error;
                    798:  * just wake up so that he can collect error status.
                    799:  */
1.7       mycroft   800: static void
1.119     matt      801: udp_notify(struct inpcb *inp, int errno)
1.1       cgd       802: {
                    803:        inp->inp_socket->so_error = errno;
                    804:        sorwakeup(inp->inp_socket);
                    805:        sowwakeup(inp->inp_socket);
                    806: }
                    807:
1.27      christos  808: void *
1.119     matt      809: udp_ctlinput(int cmd, struct sockaddr *sa, void *v)
1.1       cgd       810: {
1.66      augustss  811:        struct ip *ip = v;
                    812:        struct udphdr *uh;
1.119     matt      813:        void (*notify)(struct inpcb *, int) = udp_notify;
1.21      mycroft   814:        int errno;
1.1       cgd       815:
1.53      itojun    816:        if (sa->sa_family != AF_INET
                    817:         || sa->sa_len != sizeof(struct sockaddr_in))
1.51      itojun    818:                return NULL;
1.20      mycroft   819:        if ((unsigned)cmd >= PRC_NCMDS)
1.27      christos  820:                return NULL;
1.20      mycroft   821:        errno = inetctlerrmap[cmd];
1.18      mycroft   822:        if (PRC_IS_REDIRECT(cmd))
1.19      mycroft   823:                notify = in_rtchange, ip = 0;
1.18      mycroft   824:        else if (cmd == PRC_HOSTDEAD)
1.19      mycroft   825:                ip = 0;
1.23      cgd       826:        else if (errno == 0)
1.27      christos  827:                return NULL;
1.19      mycroft   828:        if (ip) {
1.1       cgd       829:                uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2));
1.34      mycroft   830:                in_pcbnotify(&udbtable, satosin(sa)->sin_addr, uh->uh_dport,
                    831:                    ip->ip_src, uh->uh_sport, errno, notify);
1.53      itojun    832:
                    833:                /* XXX mapped address case */
1.19      mycroft   834:        } else
1.34      mycroft   835:                in_pcbnotifyall(&udbtable, satosin(sa)->sin_addr, errno,
                    836:                    notify);
1.27      christos  837:        return NULL;
1.1       cgd       838: }
                    839:
1.7       mycroft   840: int
1.27      christos  841: udp_output(struct mbuf *m, ...)
                    842: {
1.66      augustss  843:        struct inpcb *inp;
                    844:        struct udpiphdr *ui;
1.125     thorpej   845:        struct route *ro;
1.66      augustss  846:        int len = m->m_pkthdr.len;
1.31      mycroft   847:        int error = 0;
1.27      christos  848:        va_list ap;
                    849:
1.98      matt      850:        MCLAIM(m, &udp_tx_mowner);
1.27      christos  851:        va_start(ap, m);
                    852:        inp = va_arg(ap, struct inpcb *);
                    853:        va_end(ap);
1.1       cgd       854:
                    855:        /*
                    856:         * Calculate data length and get a mbuf
                    857:         * for UDP and IP headers.
                    858:         */
1.13      mycroft   859:        M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT);
                    860:        if (m == 0) {
                    861:                error = ENOBUFS;
1.39      thorpej   862:                goto release;
                    863:        }
                    864:
                    865:        /*
                    866:         * Compute the packet length of the IP header, and
                    867:         * punt if the length looks bogus.
                    868:         */
1.96      itojun    869:        if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) {
1.39      thorpej   870:                error = EMSGSIZE;
1.13      mycroft   871:                goto release;
                    872:        }
1.1       cgd       873:
                    874:        /*
                    875:         * Fill in mbuf with extended UDP header
                    876:         * and addresses and length put into network format.
                    877:         */
                    878:        ui = mtod(m, struct udpiphdr *);
                    879:        ui->ui_pr = IPPROTO_UDP;
                    880:        ui->ui_src = inp->inp_laddr;
                    881:        ui->ui_dst = inp->inp_faddr;
                    882:        ui->ui_sport = inp->inp_lport;
                    883:        ui->ui_dport = inp->inp_fport;
1.78      thorpej   884:        ui->ui_ulen = htons((u_int16_t)len + sizeof(struct udphdr));
1.1       cgd       885:
1.125     thorpej   886:        ro = &inp->inp_route;
                    887:
1.1       cgd       888:        /*
1.78      thorpej   889:         * Set up checksum and output datagram.
1.1       cgd       890:         */
                    891:        if (udpcksum) {
1.78      thorpej   892:                /*
                    893:                 * XXX Cache pseudo-header checksum part for
                    894:                 * XXX "connected" UDP sockets.
1.125     thorpej   895:                 * Maybe skip checksums on loopback interfaces.
1.78      thorpej   896:                 */
                    897:                ui->ui_sum = in_cksum_phdr(ui->ui_src.s_addr,
                    898:                    ui->ui_dst.s_addr, htons((u_int16_t)len +
                    899:                    sizeof(struct udphdr) + IPPROTO_UDP));
1.125     thorpej   900:                if (__predict_true(ro->ro_rt == NULL ||
                    901:                                   !(ro->ro_rt->rt_ifp->if_flags &
                    902:                                     IFF_LOOPBACK) ||
                    903:                                   udp_do_loopback_cksum))
                    904:                        m->m_pkthdr.csum_flags = M_CSUM_UDPv4;
                    905:                else
                    906:                        m->m_pkthdr.csum_flags = 0;
1.78      thorpej   907:                m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
                    908:        } else
                    909:                ui->ui_sum = 0;
1.96      itojun    910:        ((struct ip *)ui)->ip_len = htons(sizeof (struct udpiphdr) + len);
1.1       cgd       911:        ((struct ip *)ui)->ip_ttl = inp->inp_ip.ip_ttl; /* XXX */
                    912:        ((struct ip *)ui)->ip_tos = inp->inp_ip.ip_tos; /* XXX */
                    913:        udpstat.udps_opackets++;
1.48      itojun    914:
1.125     thorpej   915:        return (ip_output(m, inp->inp_options, ro,
1.12      mycroft   916:            inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST),
1.107     itojun    917:            inp->inp_moptions, inp->inp_socket));
1.1       cgd       918:
                    919: release:
                    920:        m_freem(m);
                    921:        return (error);
                    922: }
                    923:
1.42      thorpej   924: int    udp_sendspace = 9216;           /* really max datagram size */
                    925: int    udp_recvspace = 40 * (1024 + sizeof(struct sockaddr_in));
1.1       cgd       926:                                        /* 40 1K datagrams */
                    927:
                    928: /*ARGSUSED*/
1.7       mycroft   929: int
1.119     matt      930: udp_usrreq(struct socket *so, int req, struct mbuf *m, struct mbuf *nam,
                    931:        struct mbuf *control, struct proc *p)
1.1       cgd       932: {
1.66      augustss  933:        struct inpcb *inp;
1.1       cgd       934:        int s;
1.66      augustss  935:        int error = 0;
1.1       cgd       936:
                    937:        if (req == PRU_CONTROL)
1.31      mycroft   938:                return (in_control(so, (long)m, (caddr_t)nam,
1.30      mycroft   939:                    (struct ifnet *)control, p));
1.59      thorpej   940:
1.60      thorpej   941:        if (req == PRU_PURGEIF) {
1.80      itojun    942:                in_pcbpurgeif0(&udbtable, (struct ifnet *)control);
1.60      thorpej   943:                in_purgeif((struct ifnet *)control);
                    944:                in_pcbpurgeif(&udbtable, (struct ifnet *)control);
1.59      thorpej   945:                return (0);
                    946:        }
1.31      mycroft   947:
                    948:        s = splsoftnet();
                    949:        inp = sotoinpcb(so);
1.32      mycroft   950: #ifdef DIAGNOSTIC
                    951:        if (req != PRU_SEND && req != PRU_SENDOOB && control)
                    952:                panic("udp_usrreq: unexpected control mbuf");
                    953: #endif
1.31      mycroft   954:        if (inp == 0 && req != PRU_ATTACH) {
                    955:                error = EINVAL;
                    956:                goto release;
                    957:        }
                    958:
1.1       cgd       959:        /*
                    960:         * Note: need to block udp_input while changing
                    961:         * the udp pcb queue and/or pcb addresses.
                    962:         */
                    963:        switch (req) {
                    964:
                    965:        case PRU_ATTACH:
1.31      mycroft   966:                if (inp != 0) {
                    967:                        error = EISCONN;
1.1       cgd       968:                        break;
                    969:                }
1.98      matt      970: #ifdef MBUFTRACE
                    971:                so->so_mowner = &udp_mowner;
                    972:                so->so_rcv.sb_mowner = &udp_rx_mowner;
                    973:                so->so_snd.sb_mowner = &udp_tx_mowner;
                    974: #endif
1.31      mycroft   975:                if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
                    976:                        error = soreserve(so, udp_sendspace, udp_recvspace);
                    977:                        if (error)
                    978:                                break;
                    979:                }
1.18      mycroft   980:                error = in_pcballoc(so, &udbtable);
1.1       cgd       981:                if (error)
                    982:                        break;
1.31      mycroft   983:                inp = sotoinpcb(so);
                    984:                inp->inp_ip.ip_ttl = ip_defttl;
1.1       cgd       985:                break;
                    986:
                    987:        case PRU_DETACH:
1.31      mycroft   988:                in_pcbdetach(inp);
1.1       cgd       989:                break;
                    990:
                    991:        case PRU_BIND:
1.31      mycroft   992:                error = in_pcbbind(inp, nam, p);
1.1       cgd       993:                break;
                    994:
                    995:        case PRU_LISTEN:
                    996:                error = EOPNOTSUPP;
                    997:                break;
                    998:
                    999:        case PRU_CONNECT:
1.31      mycroft  1000:                error = in_pcbconnect(inp, nam);
                   1001:                if (error)
1.1       cgd      1002:                        break;
1.31      mycroft  1003:                soisconnected(so);
1.1       cgd      1004:                break;
                   1005:
                   1006:        case PRU_CONNECT2:
                   1007:                error = EOPNOTSUPP;
                   1008:                break;
                   1009:
                   1010:        case PRU_DISCONNECT:
1.31      mycroft  1011:                /*soisdisconnected(so);*/
                   1012:                so->so_state &= ~SS_ISCONNECTED;        /* XXX */
1.1       cgd      1013:                in_pcbdisconnect(inp);
1.34      mycroft  1014:                inp->inp_laddr = zeroin_addr;           /* XXX */
1.35      mycroft  1015:                in_pcbstate(inp, INP_BOUND);            /* XXX */
1.1       cgd      1016:                break;
                   1017:
                   1018:        case PRU_SHUTDOWN:
                   1019:                socantsendmore(so);
                   1020:                break;
                   1021:
1.31      mycroft  1022:        case PRU_RCVD:
                   1023:                error = EOPNOTSUPP;
1.1       cgd      1024:                break;
                   1025:
1.31      mycroft  1026:        case PRU_SEND:
1.32      mycroft  1027:                if (control && control->m_len) {
                   1028:                        m_freem(control);
                   1029:                        m_freem(m);
                   1030:                        error = EINVAL;
                   1031:                        break;
                   1032:                }
1.31      mycroft  1033:        {
1.35      mycroft  1034:                struct in_addr laddr;                   /* XXX */
1.1       cgd      1035:
1.31      mycroft  1036:                if (nam) {
1.35      mycroft  1037:                        laddr = inp->inp_laddr;         /* XXX */
1.31      mycroft  1038:                        if ((so->so_state & SS_ISCONNECTED) != 0) {
                   1039:                                error = EISCONN;
1.32      mycroft  1040:                                goto die;
1.31      mycroft  1041:                        }
                   1042:                        error = in_pcbconnect(inp, nam);
1.100     matt     1043:                        if (error)
                   1044:                                goto die;
1.31      mycroft  1045:                } else {
                   1046:                        if ((so->so_state & SS_ISCONNECTED) == 0) {
                   1047:                                error = ENOTCONN;
1.32      mycroft  1048:                                goto die;
1.31      mycroft  1049:                        }
                   1050:                }
1.33      mycroft  1051:                error = udp_output(m, inp);
1.100     matt     1052:                m = NULL;
1.31      mycroft  1053:                if (nam) {
                   1054:                        in_pcbdisconnect(inp);
1.35      mycroft  1055:                        inp->inp_laddr = laddr;         /* XXX */
                   1056:                        in_pcbstate(inp, INP_BOUND);    /* XXX */
1.31      mycroft  1057:                }
1.100     matt     1058:          die:
                   1059:                if (m)
                   1060:                        m_freem(m);
1.31      mycroft  1061:        }
1.1       cgd      1062:                break;
                   1063:
                   1064:        case PRU_SENSE:
                   1065:                /*
                   1066:                 * stat: don't bother with a blocksize.
                   1067:                 */
1.31      mycroft  1068:                splx(s);
1.1       cgd      1069:                return (0);
                   1070:
1.31      mycroft  1071:        case PRU_RCVOOB:
                   1072:                error =  EOPNOTSUPP;
                   1073:                break;
                   1074:
1.1       cgd      1075:        case PRU_SENDOOB:
1.32      mycroft  1076:                m_freem(control);
1.31      mycroft  1077:                m_freem(m);
1.1       cgd      1078:                error =  EOPNOTSUPP;
                   1079:                break;
                   1080:
1.31      mycroft  1081:        case PRU_SOCKADDR:
                   1082:                in_setsockaddr(inp, nam);
                   1083:                break;
                   1084:
                   1085:        case PRU_PEERADDR:
                   1086:                in_setpeeraddr(inp, nam);
                   1087:                break;
1.1       cgd      1088:
                   1089:        default:
                   1090:                panic("udp_usrreq");
                   1091:        }
                   1092:
                   1093: release:
1.31      mycroft  1094:        splx(s);
1.1       cgd      1095:        return (error);
1.13      mycroft  1096: }
                   1097:
                   1098: /*
                   1099:  * Sysctl for udp variables.
                   1100:  */
1.114     atatat   1101: SYSCTL_SETUP(sysctl_net_inet_udp_setup, "sysctl net.inet.udp subtree setup")
1.13      mycroft  1102: {
1.114     atatat   1103:
1.116     atatat   1104:        sysctl_createv(clog, 0, NULL, NULL,
                   1105:                       CTLFLAG_PERMANENT,
1.114     atatat   1106:                       CTLTYPE_NODE, "net", NULL,
                   1107:                       NULL, 0, NULL, 0,
                   1108:                       CTL_NET, CTL_EOL);
1.116     atatat   1109:        sysctl_createv(clog, 0, NULL, NULL,
                   1110:                       CTLFLAG_PERMANENT,
1.114     atatat   1111:                       CTLTYPE_NODE, "inet", NULL,
                   1112:                       NULL, 0, NULL, 0,
                   1113:                       CTL_NET, PF_INET, CTL_EOL);
1.116     atatat   1114:        sysctl_createv(clog, 0, NULL, NULL,
                   1115:                       CTLFLAG_PERMANENT,
1.122     atatat   1116:                       CTLTYPE_NODE, "udp",
                   1117:                       SYSCTL_DESCR("UDPv4 related settings"),
1.114     atatat   1118:                       NULL, 0, NULL, 0,
                   1119:                       CTL_NET, PF_INET, IPPROTO_UDP, CTL_EOL);
                   1120:
1.116     atatat   1121:        sysctl_createv(clog, 0, NULL, NULL,
                   1122:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.122     atatat   1123:                       CTLTYPE_INT, "checksum",
1.123     heas     1124:                       SYSCTL_DESCR("Compute UDP checksums"),
1.114     atatat   1125:                       NULL, 0, &udpcksum, 0,
                   1126:                       CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_CHECKSUM,
                   1127:                       CTL_EOL);
1.116     atatat   1128:        sysctl_createv(clog, 0, NULL, NULL,
                   1129:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.122     atatat   1130:                       CTLTYPE_INT, "sendspace",
                   1131:                       SYSCTL_DESCR("Default UDP send buffer size"),
1.114     atatat   1132:                       NULL, 0, &udp_sendspace, 0,
                   1133:                       CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_SENDSPACE,
                   1134:                       CTL_EOL);
1.116     atatat   1135:        sysctl_createv(clog, 0, NULL, NULL,
                   1136:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.122     atatat   1137:                       CTLTYPE_INT, "recvspace",
                   1138:                       SYSCTL_DESCR("Default UDP receive buffer size"),
1.114     atatat   1139:                       NULL, 0, &udp_recvspace, 0,
                   1140:                       CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_RECVSPACE,
                   1141:                       CTL_EOL);
1.125     thorpej  1142:        sysctl_createv(clog, 0, NULL, NULL,
                   1143:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1144:                       CTLTYPE_INT, "do_loopback_cksum",
                   1145:                       SYSCTL_DESCR("Perform UDP checksum on loopback"),
                   1146:                       NULL, 0, &udp_do_loopback_cksum, 0,
                   1147:                       CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_LOOPBACKCKSUM,
                   1148:                       CTL_EOL);
1.1       cgd      1149: }
1.72      itojun   1150: #endif

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