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Annotation of src/sys/netinet/udp_usrreq.c, Revision 1.228

1.228   ! mlelstv     1: /*     $NetBSD: udp_usrreq.c,v 1.227 2016/10/19 01:13:01 ozaki-r 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:
1.198     rmind      63: /*
                     64:  * UDP protocol implementation.
                     65:  * Per RFC 768, August, 1980.
                     66:  */
                     67:
1.91      lukem      68: #include <sys/cdefs.h>
1.228   ! mlelstv    69: __KERNEL_RCSID(0, "$NetBSD: udp_usrreq.c,v 1.227 2016/10/19 01:13:01 ozaki-r Exp $");
1.50      thorpej    70:
1.222     pooka      71: #ifdef _KERNEL_OPT
1.77      soda       72: #include "opt_inet.h"
1.174     christos   73: #include "opt_compat_netbsd.h"
1.50      thorpej    74: #include "opt_ipsec.h"
1.78      thorpej    75: #include "opt_inet_csum.h"
1.64      ws         76: #include "opt_ipkdb.h"
1.101     martin     77: #include "opt_mbuftrace.h"
1.222     pooka      78: #endif
1.1       cgd        79:
1.5       mycroft    80: #include <sys/param.h>
                     81: #include <sys/mbuf.h>
1.192     pooka      82: #include <sys/once.h>
1.5       mycroft    83: #include <sys/protosw.h>
                     84: #include <sys/socket.h>
                     85: #include <sys/socketvar.h>
1.27      christos   86: #include <sys/systm.h>
                     87: #include <sys/proc.h>
1.53      itojun     88: #include <sys/domain.h>
1.27      christos   89: #include <sys/sysctl.h>
1.1       cgd        90:
1.5       mycroft    91: #include <net/if.h>
1.1       cgd        92:
1.5       mycroft    93: #include <netinet/in.h>
                     94: #include <netinet/in_systm.h>
1.15      cgd        95: #include <netinet/in_var.h>
1.5       mycroft    96: #include <netinet/ip.h>
                     97: #include <netinet/in_pcb.h>
                     98: #include <netinet/ip_var.h>
                     99: #include <netinet/ip_icmp.h>
                    100: #include <netinet/udp.h>
                    101: #include <netinet/udp_var.h>
1.166     thorpej   102: #include <netinet/udp_private.h>
1.1       cgd       103:
1.53      itojun    104: #ifdef INET6
                    105: #include <netinet/ip6.h>
                    106: #include <netinet/icmp6.h>
                    107: #include <netinet6/ip6_var.h>
1.167     thorpej   108: #include <netinet6/ip6_private.h>
1.53      itojun    109: #include <netinet6/in6_pcb.h>
                    110: #include <netinet6/udp6_var.h>
1.168     thorpej   111: #include <netinet6/udp6_private.h>
1.53      itojun    112: #endif
                    113:
                    114: #ifndef INET6
                    115: /* always need ip6.h for IP6_EXTHDR_GET */
                    116: #include <netinet/ip6.h>
                    117: #endif
                    118:
1.190     christos  119: #ifdef IPSEC
1.105     jonathan  120: #include <netipsec/ipsec.h>
1.169     thorpej   121: #include <netipsec/ipsec_var.h>
                    122: #include <netipsec/ipsec_private.h>
1.147     christos  123: #include <netipsec/esp.h>
1.105     jonathan  124: #ifdef INET6
                    125: #include <netipsec/ipsec6.h>
                    126: #endif
1.190     christos  127: #endif /* IPSEC */
1.105     jonathan  128:
1.174     christos  129: #ifdef COMPAT_50
                    130: #include <compat/sys/socket.h>
                    131: #endif
                    132:
1.64      ws        133: #ifdef IPKDB
                    134: #include <ipkdb/ipkdb.h>
                    135: #endif
                    136:
1.8       mycroft   137: int    udpcksum = 1;
1.141     yamt      138: int    udp_do_loopback_cksum = 0;
1.93      matt      139:
                    140: struct inpcbtable udbtable;
1.164     thorpej   141:
1.166     thorpej   142: percpu_t *udpstat_percpu;
1.8       mycroft   143:
1.72      itojun    144: #ifdef INET
1.190     christos  145: #ifdef IPSEC
1.144     manu      146: static int udp4_espinudp (struct mbuf **, int, struct sockaddr *,
1.130     manu      147:        struct socket *);
1.189     christos  148: #endif
1.119     matt      149: static void udp4_sendup (struct mbuf *, int, struct sockaddr *,
                    150:        struct socket *);
                    151: static int udp4_realinput (struct sockaddr_in *, struct sockaddr_in *,
1.144     manu      152:        struct mbuf **, int);
1.129     yamt      153: static int udp4_input_checksum(struct mbuf *, const struct udphdr *, int, int);
1.72      itojun    154: #endif
                    155: #ifdef INET
1.119     matt      156: static void udp_notify (struct inpcb *, int);
1.72      itojun    157: #endif
1.7       mycroft   158:
1.26      mycroft   159: #ifndef UDBHASHSIZE
                    160: #define        UDBHASHSIZE     128
                    161: #endif
                    162: int    udbhashsize = UDBHASHSIZE;
                    163:
1.196     rmind     164: /*
                    165:  * For send - really max datagram size; for receive - 40 1K datagrams.
                    166:  */
                    167: static int     udp_sendspace = 9216;
                    168: static int     udp_recvspace = 40 * (1024 + sizeof(struct sockaddr_in));
                    169:
1.98      matt      170: #ifdef MBUFTRACE
1.150     dogcow    171: struct mowner udp_mowner = MOWNER_INIT("udp", "");
                    172: struct mowner udp_rx_mowner = MOWNER_INIT("udp", "rx");
                    173: struct mowner udp_tx_mowner = MOWNER_INIT("udp", "tx");
1.98      matt      174: #endif
                    175:
1.78      thorpej   176: #ifdef UDP_CSUM_COUNTERS
                    177: #include <sys/device.h>
                    178:
1.140     yamt      179: #if defined(INET)
1.78      thorpej   180: struct evcnt udp_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    181:     NULL, "udp", "hwcsum bad");
                    182: struct evcnt udp_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    183:     NULL, "udp", "hwcsum ok");
                    184: struct evcnt udp_hwcsum_data = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    185:     NULL, "udp", "hwcsum data");
                    186: struct evcnt udp_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    187:     NULL, "udp", "swcsum");
                    188:
1.120     matt      189: EVCNT_ATTACH_STATIC(udp_hwcsum_bad);
                    190: EVCNT_ATTACH_STATIC(udp_hwcsum_ok);
                    191: EVCNT_ATTACH_STATIC(udp_hwcsum_data);
                    192: EVCNT_ATTACH_STATIC(udp_swcsum);
1.140     yamt      193: #endif /* defined(INET) */
                    194:
                    195: #define        UDP_CSUM_COUNTER_INCR(ev)       (ev)->ev_count++
1.78      thorpej   196: #else
                    197: #define        UDP_CSUM_COUNTER_INCR(ev)       /* nothing */
                    198: #endif /* UDP_CSUM_COUNTERS */
                    199:
1.179     pooka     200: static void sysctl_net_inet_udp_setup(struct sysctllog **);
                    201:
1.192     pooka     202: static int
                    203: do_udpinit(void)
1.1       cgd       204: {
1.18      mycroft   205:
1.35      mycroft   206:        in_pcbinit(&udbtable, udbhashsize, udbhashsize);
1.193     pooka     207:        udpstat_percpu = percpu_alloc(sizeof(uint64_t) * UDP_NSTATS);
1.78      thorpej   208:
1.98      matt      209:        MOWNER_ATTACH(&udp_tx_mowner);
                    210:        MOWNER_ATTACH(&udp_rx_mowner);
                    211:        MOWNER_ATTACH(&udp_mowner);
1.166     thorpej   212:
1.192     pooka     213:        return 0;
                    214: }
                    215:
                    216: void
                    217: udp_init_common(void)
                    218: {
                    219:        static ONCE_DECL(doudpinit);
                    220:
                    221:        RUN_ONCE(&doudpinit, do_udpinit);
                    222: }
                    223:
                    224: void
                    225: udp_init(void)
                    226: {
                    227:
                    228:        sysctl_net_inet_udp_setup(NULL);
                    229:
                    230:        udp_init_common();
1.1       cgd       231: }
                    232:
1.129     yamt      233: /*
                    234:  * Checksum extended UDP header and data.
                    235:  */
                    236:
                    237: int
                    238: udp_input_checksum(int af, struct mbuf *m, const struct udphdr *uh,
                    239:     int iphlen, int len)
                    240: {
                    241:
                    242:        switch (af) {
1.72      itojun    243: #ifdef INET
1.129     yamt      244:        case AF_INET:
                    245:                return udp4_input_checksum(m, uh, iphlen, len);
                    246: #endif
                    247: #ifdef INET6
                    248:        case AF_INET6:
                    249:                return udp6_input_checksum(m, uh, iphlen, len);
                    250: #endif
                    251:        }
                    252: #ifdef DIAGNOSTIC
                    253:        panic("udp_input_checksum: unknown af %d", af);
                    254: #endif
                    255:        /* NOTREACHED */
                    256:        return -1;
                    257: }
                    258:
                    259: #ifdef INET
                    260:
                    261: /*
                    262:  * Checksum extended UDP header and data.
                    263:  */
                    264:
                    265: static int
                    266: udp4_input_checksum(struct mbuf *m, const struct udphdr *uh,
                    267:     int iphlen, int len)
                    268: {
                    269:
                    270:        /*
                    271:         * XXX it's better to record and check if this mbuf is
                    272:         * already checked.
                    273:         */
                    274:
                    275:        if (uh->uh_sum == 0)
                    276:                return 0;
                    277:
                    278:        switch (m->m_pkthdr.csum_flags &
1.226     ozaki-r   279:            ((m_get_rcvif_NOMPSAFE(m)->if_csum_flags_rx & M_CSUM_UDPv4) |
1.129     yamt      280:            M_CSUM_TCP_UDP_BAD | M_CSUM_DATA)) {
                    281:        case M_CSUM_UDPv4|M_CSUM_TCP_UDP_BAD:
                    282:                UDP_CSUM_COUNTER_INCR(&udp_hwcsum_bad);
                    283:                goto badcsum;
                    284:
                    285:        case M_CSUM_UDPv4|M_CSUM_DATA: {
                    286:                u_int32_t hw_csum = m->m_pkthdr.csum_data;
                    287:
                    288:                UDP_CSUM_COUNTER_INCR(&udp_hwcsum_data);
                    289:                if (m->m_pkthdr.csum_flags & M_CSUM_NO_PSEUDOHDR) {
                    290:                        const struct ip *ip =
                    291:                            mtod(m, const struct ip *);
                    292:
                    293:                        hw_csum = in_cksum_phdr(ip->ip_src.s_addr,
                    294:                            ip->ip_dst.s_addr,
                    295:                            htons(hw_csum + len + IPPROTO_UDP));
                    296:                }
                    297:                if ((hw_csum ^ 0xffff) != 0)
                    298:                        goto badcsum;
                    299:                break;
                    300:        }
                    301:
                    302:        case M_CSUM_UDPv4:
                    303:                /* Checksum was okay. */
                    304:                UDP_CSUM_COUNTER_INCR(&udp_hwcsum_ok);
                    305:                break;
                    306:
                    307:        default:
                    308:                /*
                    309:                 * Need to compute it ourselves.  Maybe skip checksum
                    310:                 * on loopback interfaces.
                    311:                 */
1.226     ozaki-r   312:                if (__predict_true(!(m_get_rcvif_NOMPSAFE(m)->if_flags &
1.129     yamt      313:                                     IFF_LOOPBACK) ||
                    314:                                   udp_do_loopback_cksum)) {
                    315:                        UDP_CSUM_COUNTER_INCR(&udp_swcsum);
                    316:                        if (in4_cksum(m, IPPROTO_UDP, iphlen, len) != 0)
                    317:                                goto badcsum;
                    318:                }
                    319:                break;
                    320:        }
                    321:
                    322:        return 0;
                    323:
                    324: badcsum:
1.166     thorpej   325:        UDP_STATINC(UDP_STAT_BADSUM);
1.129     yamt      326:        return -1;
                    327: }
                    328:
1.7       mycroft   329: void
1.27      christos  330: udp_input(struct mbuf *m, ...)
1.1       cgd       331: {
1.53      itojun    332:        va_list ap;
                    333:        struct sockaddr_in src, dst;
                    334:        struct ip *ip;
                    335:        struct udphdr *uh;
1.97      simonb    336:        int iphlen;
1.53      itojun    337:        int len;
                    338:        int n;
1.96      itojun    339:        u_int16_t ip_len;
1.53      itojun    340:
                    341:        va_start(ap, m);
                    342:        iphlen = va_arg(ap, int);
1.97      simonb    343:        (void)va_arg(ap, int);          /* ignore value, advance ap */
1.53      itojun    344:        va_end(ap);
                    345:
1.98      matt      346:        MCLAIM(m, &udp_rx_mowner);
1.166     thorpej   347:        UDP_STATINC(UDP_STAT_IPACKETS);
1.53      itojun    348:
                    349:        /*
                    350:         * Get IP and UDP header together in first mbuf.
                    351:         */
                    352:        ip = mtod(m, struct ip *);
                    353:        IP6_EXTHDR_GET(uh, struct udphdr *, m, iphlen, sizeof(struct udphdr));
                    354:        if (uh == NULL) {
1.166     thorpej   355:                UDP_STATINC(UDP_STAT_HDROPS);
1.53      itojun    356:                return;
                    357:        }
1.228   ! mlelstv   358:        /*
        !           359:         * Enforce alignment requirements that are violated in
        !           360:         * some cases, see kern/50766 for details.
        !           361:         */
        !           362:        if (UDP_HDR_ALIGNED_P(uh) == 0) {
        !           363:                m = m_copyup(m, iphlen + sizeof(struct udphdr), 0);
        !           364:                if (m == NULL) {
        !           365:                        UDP_STATINC(UDP_STAT_HDROPS);
        !           366:                        return;
        !           367:                }
        !           368:                ip = mtod(m, struct ip *);
        !           369:                uh = (struct udphdr *)(mtod(m, char *) + iphlen);
        !           370:        }
1.95      thorpej   371:        KASSERT(UDP_HDR_ALIGNED_P(uh));
1.53      itojun    372:
1.57      itojun    373:        /* destination port of 0 is illegal, based on RFC768. */
                    374:        if (uh->uh_dport == 0)
                    375:                goto bad;
                    376:
1.53      itojun    377:        /*
                    378:         * Make mbuf data length reflect UDP length.
                    379:         * If not enough data to reflect UDP length, drop.
                    380:         */
1.96      itojun    381:        ip_len = ntohs(ip->ip_len);
1.53      itojun    382:        len = ntohs((u_int16_t)uh->uh_ulen);
1.96      itojun    383:        if (ip_len != iphlen + len) {
                    384:                if (ip_len < iphlen + len || len < sizeof(struct udphdr)) {
1.166     thorpej   385:                        UDP_STATINC(UDP_STAT_BADLEN);
1.53      itojun    386:                        goto bad;
                    387:                }
1.96      itojun    388:                m_adj(m, iphlen + len - ip_len);
1.53      itojun    389:        }
                    390:
                    391:        /*
                    392:         * Checksum extended UDP header and data.
                    393:         */
1.129     yamt      394:        if (udp4_input_checksum(m, uh, iphlen, len))
                    395:                goto badcsum;
1.53      itojun    396:
                    397:        /* construct source and dst sockaddrs. */
1.159     dyoung    398:        sockaddr_in_init(&src, &ip->ip_src, uh->uh_sport);
                    399:        sockaddr_in_init(&dst, &ip->ip_dst, uh->uh_dport);
1.53      itojun    400:
1.144     manu      401:        if ((n = udp4_realinput(&src, &dst, &m, iphlen)) == -1) {
1.166     thorpej   402:                UDP_STATINC(UDP_STAT_HDROPS);
1.144     manu      403:                return;
                    404:        }
1.188     christos  405:        if (m == NULL) {
                    406:                /*
                    407:                 * packet has been processed by ESP stuff -
                    408:                 * e.g. dropped NAT-T-keep-alive-packet ...
                    409:                 */
                    410:                return;
                    411:        }
                    412:        ip = mtod(m, struct ip *);
1.53      itojun    413: #ifdef INET6
                    414:        if (IN_MULTICAST(ip->ip_dst.s_addr) || n == 0) {
                    415:                struct sockaddr_in6 src6, dst6;
                    416:
1.175     cegger    417:                memset(&src6, 0, sizeof(src6));
1.53      itojun    418:                src6.sin6_family = AF_INET6;
                    419:                src6.sin6_len = sizeof(struct sockaddr_in6);
1.224     rtr       420:                in6_in_2_v4mapin6(&ip->ip_src, &src6.sin6_addr);
1.53      itojun    421:                src6.sin6_port = uh->uh_sport;
1.175     cegger    422:                memset(&dst6, 0, sizeof(dst6));
1.53      itojun    423:                dst6.sin6_family = AF_INET6;
                    424:                dst6.sin6_len = sizeof(struct sockaddr_in6);
1.224     rtr       425:                in6_in_2_v4mapin6(&ip->ip_dst, &dst6.sin6_addr);
1.53      itojun    426:                dst6.sin6_port = uh->uh_dport;
                    427:
                    428:                n += udp6_realinput(AF_INET, &src6, &dst6, m, iphlen);
                    429:        }
                    430: #endif
                    431:
                    432:        if (n == 0) {
                    433:                if (m->m_flags & (M_BCAST | M_MCAST)) {
1.166     thorpej   434:                        UDP_STATINC(UDP_STAT_NOPORTBCAST);
1.53      itojun    435:                        goto bad;
                    436:                }
1.166     thorpej   437:                UDP_STATINC(UDP_STAT_NOPORT);
1.64      ws        438: #ifdef IPKDB
1.53      itojun    439:                if (checkipkdb(&ip->ip_src, uh->uh_sport, uh->uh_dport,
                    440:                                m, iphlen + sizeof(struct udphdr),
                    441:                                m->m_pkthdr.len - iphlen - sizeof(struct udphdr))) {
                    442:                        /*
                    443:                         * It was a debugger connect packet,
                    444:                         * just drop it now
                    445:                         */
                    446:                        goto bad;
                    447:                }
                    448: #endif
                    449:                icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0);
                    450:                m = NULL;
                    451:        }
                    452:
                    453: bad:
                    454:        if (m)
                    455:                m_freem(m);
1.78      thorpej   456:        return;
                    457:
                    458: badcsum:
                    459:        m_freem(m);
1.53      itojun    460: }
1.72      itojun    461: #endif
1.53      itojun    462:
1.72      itojun    463: #ifdef INET
1.53      itojun    464: static void
1.119     matt      465: udp4_sendup(struct mbuf *m, int off /* offset of data portion */,
                    466:        struct sockaddr *src, struct socket *so)
1.53      itojun    467: {
                    468:        struct mbuf *opts = NULL;
                    469:        struct mbuf *n;
                    470:        struct inpcb *inp = NULL;
                    471:
                    472:        if (!so)
                    473:                return;
                    474:        switch (so->so_proto->pr_domain->dom_family) {
                    475:        case AF_INET:
                    476:                inp = sotoinpcb(so);
                    477:                break;
                    478: #ifdef INET6
                    479:        case AF_INET6:
                    480:                break;
                    481: #endif
                    482:        default:
                    483:                return;
                    484:        }
                    485:
1.190     christos  486: #if defined(IPSEC)
1.53      itojun    487:        /* check AH/ESP integrity. */
1.199     christos  488:        if (ipsec_used && so != NULL && ipsec4_in_reject_so(m, so)) {
1.169     thorpej   489:                IPSEC_STATINC(IPSEC_STAT_IN_POLVIO);
1.162     dyoung    490:                if ((n = m_copypacket(m, M_DONTWAIT)) != NULL)
1.110     itojun    491:                        icmp_error(n, ICMP_UNREACH, ICMP_UNREACH_ADMIN_PROHIBIT,
                    492:                            0, 0);
1.53      itojun    493:                return;
                    494:        }
                    495: #endif /*IPSEC*/
                    496:
1.162     dyoung    497:        if ((n = m_copypacket(m, M_DONTWAIT)) != NULL) {
1.53      itojun    498:                if (inp && (inp->inp_flags & INP_CONTROLOPTS
1.174     christos  499: #ifdef SO_OTIMESTAMP
                    500:                         || so->so_options & SO_OTIMESTAMP
                    501: #endif
1.53      itojun    502:                         || so->so_options & SO_TIMESTAMP)) {
                    503:                        struct ip *ip = mtod(n, struct ip *);
                    504:                        ip_savecontrol(inp, &opts, ip, n);
                    505:                }
                    506:
                    507:                m_adj(n, off);
                    508:                if (sbappendaddr(&so->so_rcv, src, n,
                    509:                                opts) == 0) {
                    510:                        m_freem(n);
                    511:                        if (opts)
                    512:                                m_freem(opts);
1.124     darrenr   513:                        so->so_rcv.sb_overflowed++;
1.166     thorpej   514:                        UDP_STATINC(UDP_STAT_FULLSOCK);
1.53      itojun    515:                } else
                    516:                        sorwakeup(so);
                    517:        }
                    518: }
1.72      itojun    519: #endif
1.53      itojun    520:
1.72      itojun    521: #ifdef INET
1.53      itojun    522: static int
1.119     matt      523: udp4_realinput(struct sockaddr_in *src, struct sockaddr_in *dst,
1.144     manu      524:        struct mbuf **mp, int off /* offset of udphdr */)
1.53      itojun    525: {
                    526:        u_int16_t *sport, *dport;
                    527:        int rcvcnt;
                    528:        struct in_addr *src4, *dst4;
1.109     itojun    529:        struct inpcb_hdr *inph;
1.53      itojun    530:        struct inpcb *inp;
1.144     manu      531:        struct mbuf *m = *mp;
1.53      itojun    532:
                    533:        rcvcnt = 0;
                    534:        off += sizeof(struct udphdr);   /* now, offset of payload */
                    535:
                    536:        if (src->sin_family != AF_INET || dst->sin_family != AF_INET)
                    537:                goto bad;
                    538:
                    539:        src4 = &src->sin_addr;
                    540:        sport = &src->sin_port;
                    541:        dst4 = &dst->sin_addr;
                    542:        dport = &dst->sin_port;
                    543:
1.73      itojun    544:        if (IN_MULTICAST(dst4->s_addr) ||
1.226     ozaki-r   545:            in_broadcast(*dst4, m_get_rcvif_NOMPSAFE(m))) {
1.53      itojun    546:                /*
                    547:                 * Deliver a multicast or broadcast datagram to *all* sockets
                    548:                 * for which the local and remote addresses and ports match
                    549:                 * those of the incoming datagram.  This allows more than
                    550:                 * one process to receive multi/broadcasts on the same port.
                    551:                 * (This really ought to be done for unicast datagrams as
                    552:                 * well, but that would cause problems with existing
                    553:                 * applications that open both address-specific sockets and
                    554:                 * a wildcard socket listening to the same port -- they would
                    555:                 * end up receiving duplicates of every unicast datagram.
                    556:                 * Those applications open the multiple sockets to overcome an
                    557:                 * inadequacy of the UDP socket interface, but for backwards
                    558:                 * compatibility we avoid the problem here rather than
                    559:                 * fixing the interface.  Maybe 4.5BSD will remedy this?)
                    560:                 */
                    561:
                    562:                /*
1.92      itojun    563:                 * KAME note: traditionally we dropped udpiphdr from mbuf here.
1.71      itojun    564:                 * we need udpiphdr for IPsec processing so we do that later.
1.53      itojun    565:                 */
                    566:                /*
                    567:                 * Locate pcb(s) for datagram.
                    568:                 */
1.191     christos  569:                TAILQ_FOREACH(inph, &udbtable.inpt_queue, inph_queue) {
1.109     itojun    570:                        inp = (struct inpcb *)inph;
                    571:                        if (inp->inp_af != AF_INET)
                    572:                                continue;
                    573:
1.53      itojun    574:                        if (inp->inp_lport != *dport)
                    575:                                continue;
                    576:                        if (!in_nullhost(inp->inp_laddr)) {
                    577:                                if (!in_hosteq(inp->inp_laddr, *dst4))
                    578:                                        continue;
                    579:                        }
                    580:                        if (!in_nullhost(inp->inp_faddr)) {
                    581:                                if (!in_hosteq(inp->inp_faddr, *src4) ||
                    582:                                    inp->inp_fport != *sport)
                    583:                                        continue;
                    584:                        }
                    585:
                    586:                        udp4_sendup(m, off, (struct sockaddr *)src,
                    587:                                inp->inp_socket);
                    588:                        rcvcnt++;
                    589:
                    590:                        /*
                    591:                         * Don't look for additional matches if this one does
                    592:                         * not have either the SO_REUSEPORT or SO_REUSEADDR
                    593:                         * socket options set.  This heuristic avoids searching
                    594:                         * through all pcbs in the common case of a non-shared
                    595:                         * port.  It assumes that an application will never
                    596:                         * clear these options after setting them.
                    597:                         */
                    598:                        if ((inp->inp_socket->so_options &
                    599:                            (SO_REUSEPORT|SO_REUSEADDR)) == 0)
                    600:                                break;
                    601:                }
                    602:        } else {
                    603:                /*
                    604:                 * Locate pcb for datagram.
                    605:                 */
1.180     dyoung    606:                inp = in_pcblookup_connect(&udbtable, *src4, *sport, *dst4,
                    607:                    *dport, 0);
1.53      itojun    608:                if (inp == 0) {
1.166     thorpej   609:                        UDP_STATINC(UDP_STAT_PCBHASHMISS);
1.53      itojun    610:                        inp = in_pcblookup_bind(&udbtable, *dst4, *dport);
1.82      itojun    611:                        if (inp == 0)
1.53      itojun    612:                                return rcvcnt;
                    613:                }
                    614:
1.190     christos  615: #ifdef IPSEC
1.130     manu      616:                /* Handle ESP over UDP */
                    617:                if (inp->inp_flags & INP_ESPINUDP_ALL) {
                    618:                        struct sockaddr *sa = (struct sockaddr *)src;
                    619:
1.144     manu      620:                        switch(udp4_espinudp(mp, off, sa, inp->inp_socket)) {
                    621:                        case -1:        /* Error, m was freeed */
                    622:                                rcvcnt = -1;
                    623:                                goto bad;
                    624:                                break;
                    625:
                    626:                        case 1:         /* ESP over UDP */
1.130     manu      627:                                rcvcnt++;
                    628:                                goto bad;
1.144     manu      629:                                break;
                    630:
                    631:                        case 0:         /* plain UDP */
                    632:                        default:        /* Unexpected */
                    633:                                /*
                    634:                                 * Normal UDP processing will take place
                    635:                                 * m may have changed.
                    636:                                 */
                    637:                                m = *mp;
                    638:                                break;
1.130     manu      639:                        }
                    640:                }
1.189     christos  641: #endif
1.130     manu      642:
1.178     minskim   643:                /*
                    644:                 * Check the minimum TTL for socket.
                    645:                 */
                    646:                if (mtod(m, struct ip *)->ip_ttl < inp->inp_ip_minttl)
                    647:                        goto bad;
                    648:
1.53      itojun    649:                udp4_sendup(m, off, (struct sockaddr *)src, inp->inp_socket);
                    650:                rcvcnt++;
                    651:        }
                    652:
                    653: bad:
                    654:        return rcvcnt;
                    655: }
1.72      itojun    656: #endif
1.53      itojun    657:
1.72      itojun    658: #ifdef INET
1.1       cgd       659: /*
                    660:  * Notify a udp user of an asynchronous error;
                    661:  * just wake up so that he can collect error status.
                    662:  */
1.7       mycroft   663: static void
1.119     matt      664: udp_notify(struct inpcb *inp, int errno)
1.1       cgd       665: {
                    666:        inp->inp_socket->so_error = errno;
                    667:        sorwakeup(inp->inp_socket);
                    668:        sowwakeup(inp->inp_socket);
                    669: }
                    670:
1.27      christos  671: void *
1.157     dyoung    672: udp_ctlinput(int cmd, const struct sockaddr *sa, void *v)
1.1       cgd       673: {
1.66      augustss  674:        struct ip *ip = v;
                    675:        struct udphdr *uh;
1.119     matt      676:        void (*notify)(struct inpcb *, int) = udp_notify;
1.21      mycroft   677:        int errno;
1.1       cgd       678:
1.53      itojun    679:        if (sa->sa_family != AF_INET
                    680:         || sa->sa_len != sizeof(struct sockaddr_in))
1.51      itojun    681:                return NULL;
1.20      mycroft   682:        if ((unsigned)cmd >= PRC_NCMDS)
1.27      christos  683:                return NULL;
1.20      mycroft   684:        errno = inetctlerrmap[cmd];
1.18      mycroft   685:        if (PRC_IS_REDIRECT(cmd))
1.19      mycroft   686:                notify = in_rtchange, ip = 0;
1.18      mycroft   687:        else if (cmd == PRC_HOSTDEAD)
1.19      mycroft   688:                ip = 0;
1.23      cgd       689:        else if (errno == 0)
1.27      christos  690:                return NULL;
1.19      mycroft   691:        if (ip) {
1.158     christos  692:                uh = (struct udphdr *)((char *)ip + (ip->ip_hl << 2));
1.157     dyoung    693:                in_pcbnotify(&udbtable, satocsin(sa)->sin_addr, uh->uh_dport,
1.34      mycroft   694:                    ip->ip_src, uh->uh_sport, errno, notify);
1.53      itojun    695:
                    696:                /* XXX mapped address case */
1.19      mycroft   697:        } else
1.157     dyoung    698:                in_pcbnotifyall(&udbtable, satocsin(sa)->sin_addr, errno,
1.34      mycroft   699:                    notify);
1.27      christos  700:        return NULL;
1.1       cgd       701: }
                    702:
1.7       mycroft   703: int
1.173     plunky    704: udp_ctloutput(int op, struct socket *so, struct sockopt *sopt)
1.130     manu      705: {
                    706:        int s;
                    707:        int error = 0;
                    708:        struct inpcb *inp;
                    709:        int family;
1.173     plunky    710:        int optval;
1.130     manu      711:
                    712:        family = so->so_proto->pr_domain->dom_family;
                    713:
                    714:        s = splsoftnet();
                    715:        switch (family) {
                    716: #ifdef INET
                    717:        case PF_INET:
1.173     plunky    718:                if (sopt->sopt_level != IPPROTO_UDP) {
                    719:                        error = ip_ctloutput(op, so, sopt);
1.130     manu      720:                        goto end;
                    721:                }
                    722:                break;
                    723: #endif
                    724: #ifdef INET6
                    725:        case PF_INET6:
1.173     plunky    726:                if (sopt->sopt_level != IPPROTO_UDP) {
                    727:                        error = ip6_ctloutput(op, so, sopt);
1.130     manu      728:                        goto end;
                    729:                }
                    730:                break;
                    731: #endif
                    732:        default:
                    733:                error = EAFNOSUPPORT;
                    734:                goto end;
                    735:        }
                    736:
                    737:
                    738:        switch (op) {
                    739:        case PRCO_SETOPT:
                    740:                inp = sotoinpcb(so);
                    741:
1.173     plunky    742:                switch (sopt->sopt_name) {
1.130     manu      743:                case UDP_ENCAP:
1.173     plunky    744:                        error = sockopt_getint(sopt, &optval);
                    745:                        if (error)
1.153     yamt      746:                                break;
1.131     perry     747:
1.173     plunky    748:                        switch(optval) {
1.130     manu      749:                        case 0:
                    750:                                inp->inp_flags &= ~INP_ESPINUDP_ALL;
                    751:                                break;
                    752:
                    753:                        case UDP_ENCAP_ESPINUDP:
                    754:                                inp->inp_flags &= ~INP_ESPINUDP_ALL;
                    755:                                inp->inp_flags |= INP_ESPINUDP;
                    756:                                break;
1.131     perry     757:
1.130     manu      758:                        case UDP_ENCAP_ESPINUDP_NON_IKE:
                    759:                                inp->inp_flags &= ~INP_ESPINUDP_ALL;
                    760:                                inp->inp_flags |= INP_ESPINUDP_NON_IKE;
                    761:                                break;
                    762:                        default:
                    763:                                error = EINVAL;
                    764:                                break;
                    765:                        }
                    766:                        break;
1.183     christos  767:
1.130     manu      768:                default:
                    769:                        error = ENOPROTOOPT;
                    770:                        break;
                    771:                }
                    772:                break;
                    773:
                    774:        default:
                    775:                error = EINVAL;
                    776:                break;
1.131     perry     777:        }
                    778:
1.130     manu      779: end:
                    780:        splx(s);
                    781:        return error;
                    782: }
1.131     perry     783:
1.130     manu      784:
                    785: int
1.223     riastrad  786: udp_output(struct mbuf *m, struct inpcb *inp)
1.27      christos  787: {
1.66      augustss  788:        struct udpiphdr *ui;
1.125     thorpej   789:        struct route *ro;
1.66      augustss  790:        int len = m->m_pkthdr.len;
1.31      mycroft   791:        int error = 0;
1.27      christos  792:
1.98      matt      793:        MCLAIM(m, &udp_tx_mowner);
1.1       cgd       794:
                    795:        /*
                    796:         * Calculate data length and get a mbuf
                    797:         * for UDP and IP headers.
                    798:         */
1.13      mycroft   799:        M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT);
                    800:        if (m == 0) {
                    801:                error = ENOBUFS;
1.39      thorpej   802:                goto release;
                    803:        }
                    804:
                    805:        /*
                    806:         * Compute the packet length of the IP header, and
                    807:         * punt if the length looks bogus.
                    808:         */
1.96      itojun    809:        if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) {
1.39      thorpej   810:                error = EMSGSIZE;
1.13      mycroft   811:                goto release;
                    812:        }
1.1       cgd       813:
                    814:        /*
                    815:         * Fill in mbuf with extended UDP header
                    816:         * and addresses and length put into network format.
                    817:         */
                    818:        ui = mtod(m, struct udpiphdr *);
                    819:        ui->ui_pr = IPPROTO_UDP;
                    820:        ui->ui_src = inp->inp_laddr;
                    821:        ui->ui_dst = inp->inp_faddr;
                    822:        ui->ui_sport = inp->inp_lport;
                    823:        ui->ui_dport = inp->inp_fport;
1.78      thorpej   824:        ui->ui_ulen = htons((u_int16_t)len + sizeof(struct udphdr));
1.1       cgd       825:
1.125     thorpej   826:        ro = &inp->inp_route;
                    827:
1.1       cgd       828:        /*
1.78      thorpej   829:         * Set up checksum and output datagram.
1.1       cgd       830:         */
                    831:        if (udpcksum) {
1.78      thorpej   832:                /*
                    833:                 * XXX Cache pseudo-header checksum part for
                    834:                 * XXX "connected" UDP sockets.
                    835:                 */
                    836:                ui->ui_sum = in_cksum_phdr(ui->ui_src.s_addr,
                    837:                    ui->ui_dst.s_addr, htons((u_int16_t)len +
                    838:                    sizeof(struct udphdr) + IPPROTO_UDP));
1.135     yamt      839:                m->m_pkthdr.csum_flags = M_CSUM_UDPv4;
1.78      thorpej   840:                m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
                    841:        } else
                    842:                ui->ui_sum = 0;
1.96      itojun    843:        ((struct ip *)ui)->ip_len = htons(sizeof (struct udpiphdr) + len);
1.1       cgd       844:        ((struct ip *)ui)->ip_ttl = inp->inp_ip.ip_ttl; /* XXX */
                    845:        ((struct ip *)ui)->ip_tos = inp->inp_ip.ip_tos; /* XXX */
1.166     thorpej   846:        UDP_STATINC(UDP_STAT_OPACKETS);
1.48      itojun    847:
1.125     thorpej   848:        return (ip_output(m, inp->inp_options, ro,
1.12      mycroft   849:            inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST),
1.107     itojun    850:            inp->inp_moptions, inp->inp_socket));
1.1       cgd       851:
                    852: release:
                    853:        m_freem(m);
                    854:        return (error);
                    855: }
                    856:
1.196     rmind     857: static int
                    858: udp_attach(struct socket *so, int proto)
                    859: {
                    860:        struct inpcb *inp;
                    861:        int error;
                    862:
                    863:        KASSERT(sotoinpcb(so) == NULL);
                    864:
                    865:        /* Assign the lock (must happen even if we will error out). */
                    866:        sosetlock(so);
                    867:
                    868: #ifdef MBUFTRACE
                    869:        so->so_mowner = &udp_mowner;
                    870:        so->so_rcv.sb_mowner = &udp_rx_mowner;
                    871:        so->so_snd.sb_mowner = &udp_tx_mowner;
                    872: #endif
                    873:        if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
                    874:                error = soreserve(so, udp_sendspace, udp_recvspace);
                    875:                if (error) {
                    876:                        return error;
                    877:                }
                    878:        }
                    879:
                    880:        error = in_pcballoc(so, &udbtable);
                    881:        if (error) {
                    882:                return error;
                    883:        }
                    884:        inp = sotoinpcb(so);
                    885:        inp->inp_ip.ip_ttl = ip_defttl;
                    886:        KASSERT(solocked(so));
                    887:
                    888:        return error;
                    889: }
                    890:
                    891: static void
                    892: udp_detach(struct socket *so)
                    893: {
                    894:        struct inpcb *inp;
                    895:
                    896:        KASSERT(solocked(so));
                    897:        inp = sotoinpcb(so);
                    898:        KASSERT(inp != NULL);
                    899:        in_pcbdetach(inp);
                    900: }
1.1       cgd       901:
1.195     rmind     902: static int
1.219     rtr       903: udp_accept(struct socket *so, struct sockaddr *nam)
1.208     rtr       904: {
                    905:        KASSERT(solocked(so));
                    906:
                    907:        panic("udp_accept");
1.210     rtr       908:
1.208     rtr       909:        return EOPNOTSUPP;
                    910: }
                    911:
                    912: static int
1.218     rtr       913: udp_bind(struct socket *so, struct sockaddr *nam, struct lwp *l)
1.210     rtr       914: {
                    915:        struct inpcb *inp = sotoinpcb(so);
1.218     rtr       916:        struct sockaddr_in *sin = (struct sockaddr_in *)nam;
1.210     rtr       917:        int error = 0;
                    918:        int s;
                    919:
                    920:        KASSERT(solocked(so));
                    921:        KASSERT(inp != NULL);
                    922:        KASSERT(nam != NULL);
                    923:
                    924:        s = splsoftnet();
1.218     rtr       925:        error = in_pcbbind(inp, sin, l);
1.210     rtr       926:        splx(s);
                    927:
                    928:        return error;
                    929: }
                    930:
                    931: static int
1.214     rtr       932: udp_listen(struct socket *so, struct lwp *l)
1.210     rtr       933: {
                    934:        KASSERT(solocked(so));
                    935:
                    936:        return EOPNOTSUPP;
                    937: }
                    938:
1.211     rtr       939: static int
1.221     rtr       940: udp_connect(struct socket *so, struct sockaddr *nam, struct lwp *l)
1.211     rtr       941: {
                    942:        struct inpcb *inp = sotoinpcb(so);
                    943:        int error = 0;
                    944:        int s;
                    945:
                    946:        KASSERT(solocked(so));
                    947:        KASSERT(inp != NULL);
                    948:        KASSERT(nam != NULL);
                    949:
                    950:        s = splsoftnet();
1.221     rtr       951:        error = in_pcbconnect(inp, (struct sockaddr_in *)nam, l);
1.211     rtr       952:        if (! error)
                    953:                soisconnected(so);
                    954:        splx(s);
                    955:        return error;
                    956: }
1.210     rtr       957:
                    958: static int
1.217     rtr       959: udp_connect2(struct socket *so, struct socket *so2)
                    960: {
                    961:        KASSERT(solocked(so));
                    962:
                    963:        return EOPNOTSUPP;
                    964: }
                    965:
                    966: static int
1.212     rtr       967: udp_disconnect(struct socket *so)
                    968: {
                    969:        struct inpcb *inp = sotoinpcb(so);
                    970:        int s;
                    971:
                    972:        KASSERT(solocked(so));
                    973:        KASSERT(inp != NULL);
                    974:
                    975:        s = splsoftnet();
                    976:        /*soisdisconnected(so);*/
                    977:        so->so_state &= ~SS_ISCONNECTED;        /* XXX */
                    978:        in_pcbdisconnect(inp);
                    979:        inp->inp_laddr = zeroin_addr;           /* XXX */
                    980:        in_pcbstate(inp, INP_BOUND);            /* XXX */
                    981:        splx(s);
                    982:
                    983:        return 0;
                    984: }
                    985:
                    986: static int
                    987: udp_shutdown(struct socket *so)
                    988: {
                    989:        int s;
                    990:
                    991:        KASSERT(solocked(so));
                    992:
                    993:        s = splsoftnet();
                    994:        socantsendmore(so);
                    995:        splx(s);
                    996:
                    997:        return 0;
                    998: }
                    999:
                   1000: static int
                   1001: udp_abort(struct socket *so)
                   1002: {
                   1003:        KASSERT(solocked(so));
                   1004:
                   1005:        panic("udp_abort");
                   1006:
                   1007:        return EOPNOTSUPP;
                   1008: }
                   1009:
                   1010: static int
1.202     rtr      1011: udp_ioctl(struct socket *so, u_long cmd, void *nam, struct ifnet *ifp)
1.200     rtr      1012: {
1.202     rtr      1013:        return in_control(so, cmd, nam, ifp);
1.200     rtr      1014: }
                   1015:
                   1016: static int
1.203     rtr      1017: udp_stat(struct socket *so, struct stat *ub)
                   1018: {
1.206     rtr      1019:        KASSERT(solocked(so));
                   1020:
1.205     rtr      1021:        /* stat: don't bother with a blocksize. */
                   1022:        return 0;
1.203     rtr      1023: }
                   1024:
                   1025: static int
1.219     rtr      1026: udp_peeraddr(struct socket *so, struct sockaddr *nam)
1.207     rtr      1027: {
1.213     rtr      1028:        int s;
                   1029:
1.207     rtr      1030:        KASSERT(solocked(so));
                   1031:        KASSERT(sotoinpcb(so) != NULL);
                   1032:        KASSERT(nam != NULL);
                   1033:
1.213     rtr      1034:        s = splsoftnet();
1.219     rtr      1035:        in_setpeeraddr(sotoinpcb(so), (struct sockaddr_in *)nam);
1.213     rtr      1036:        splx(s);
                   1037:
1.207     rtr      1038:        return 0;
                   1039: }
                   1040:
                   1041: static int
1.219     rtr      1042: udp_sockaddr(struct socket *so, struct sockaddr *nam)
1.207     rtr      1043: {
1.213     rtr      1044:        int s;
                   1045:
1.207     rtr      1046:        KASSERT(solocked(so));
                   1047:        KASSERT(sotoinpcb(so) != NULL);
                   1048:        KASSERT(nam != NULL);
                   1049:
1.213     rtr      1050:        s = splsoftnet();
1.219     rtr      1051:        in_setsockaddr(sotoinpcb(so), (struct sockaddr_in *)nam);
1.213     rtr      1052:        splx(s);
                   1053:
1.207     rtr      1054:        return 0;
                   1055: }
                   1056:
                   1057: static int
1.216     rtr      1058: udp_rcvd(struct socket *so, int flags, struct lwp *l)
                   1059: {
                   1060:        KASSERT(solocked(so));
                   1061:
                   1062:        return EOPNOTSUPP;
                   1063: }
                   1064:
                   1065: static int
1.209     rtr      1066: udp_recvoob(struct socket *so, struct mbuf *m, int flags)
                   1067: {
                   1068:        KASSERT(solocked(so));
                   1069:
                   1070:        return EOPNOTSUPP;
                   1071: }
                   1072:
                   1073: static int
1.221     rtr      1074: udp_send(struct socket *so, struct mbuf *m, struct sockaddr *nam,
1.215     rtr      1075:     struct mbuf *control, struct lwp *l)
                   1076: {
                   1077:        struct inpcb *inp = sotoinpcb(so);
                   1078:        int error = 0;
                   1079:        struct in_addr laddr;                   /* XXX */
                   1080:        int s;
                   1081:
                   1082:        KASSERT(solocked(so));
                   1083:        KASSERT(inp != NULL);
                   1084:        KASSERT(m != NULL);
                   1085:
                   1086:        if (control && control->m_len) {
                   1087:                m_freem(control);
                   1088:                m_freem(m);
                   1089:                return EINVAL;
                   1090:        }
                   1091:
                   1092:        memset(&laddr, 0, sizeof laddr);
                   1093:
                   1094:        s = splsoftnet();
                   1095:        if (nam) {
                   1096:                laddr = inp->inp_laddr;         /* XXX */
                   1097:                if ((so->so_state & SS_ISCONNECTED) != 0) {
                   1098:                        error = EISCONN;
                   1099:                        goto die;
                   1100:                }
1.221     rtr      1101:                error = in_pcbconnect(inp, (struct sockaddr_in *)nam, l);
1.215     rtr      1102:                if (error)
                   1103:                        goto die;
                   1104:        } else {
                   1105:                if ((so->so_state & SS_ISCONNECTED) == 0) {
                   1106:                        error = ENOTCONN;
                   1107:                        goto die;
                   1108:                }
                   1109:        }
                   1110:        error = udp_output(m, inp);
                   1111:        m = NULL;
                   1112:        if (nam) {
                   1113:                in_pcbdisconnect(inp);
                   1114:                inp->inp_laddr = laddr;         /* XXX */
                   1115:                in_pcbstate(inp, INP_BOUND);    /* XXX */
                   1116:        }
                   1117:   die:
                   1118:        if (m)
                   1119:                m_freem(m);
                   1120:
                   1121:        splx(s);
                   1122:        return error;
                   1123: }
                   1124:
                   1125: static int
1.209     rtr      1126: udp_sendoob(struct socket *so, struct mbuf *m, struct mbuf *control)
                   1127: {
                   1128:        KASSERT(solocked(so));
                   1129:
                   1130:        m_freem(m);
                   1131:        m_freem(control);
                   1132:
                   1133:        return EOPNOTSUPP;
                   1134: }
                   1135:
                   1136: static int
1.217     rtr      1137: udp_purgeif(struct socket *so, struct ifnet *ifp)
                   1138: {
                   1139:        int s;
                   1140:
                   1141:        s = splsoftnet();
                   1142:        mutex_enter(softnet_lock);
                   1143:        in_pcbpurgeif0(&udbtable, ifp);
                   1144:        in_purgeif(ifp);
                   1145:        in_pcbpurgeif(&udbtable, ifp);
                   1146:        mutex_exit(softnet_lock);
                   1147:        splx(s);
                   1148:
                   1149:        return 0;
                   1150: }
                   1151:
                   1152: static int
1.166     thorpej  1153: sysctl_net_inet_udp_stats(SYSCTLFN_ARGS)
                   1154: {
                   1155:
1.172     thorpej  1156:        return (NETSTAT_SYSCTL(udpstat_percpu, UDP_NSTATS));
1.166     thorpej  1157: }
                   1158:
1.13      mycroft  1159: /*
                   1160:  * Sysctl for udp variables.
                   1161:  */
1.179     pooka    1162: static void
                   1163: sysctl_net_inet_udp_setup(struct sysctllog **clog)
1.13      mycroft  1164: {
1.194     pooka    1165:
1.116     atatat   1166:        sysctl_createv(clog, 0, NULL, NULL,
                   1167:                       CTLFLAG_PERMANENT,
1.114     atatat   1168:                       CTLTYPE_NODE, "inet", NULL,
                   1169:                       NULL, 0, NULL, 0,
                   1170:                       CTL_NET, PF_INET, CTL_EOL);
1.116     atatat   1171:        sysctl_createv(clog, 0, NULL, NULL,
                   1172:                       CTLFLAG_PERMANENT,
1.122     atatat   1173:                       CTLTYPE_NODE, "udp",
                   1174:                       SYSCTL_DESCR("UDPv4 related settings"),
1.114     atatat   1175:                       NULL, 0, NULL, 0,
                   1176:                       CTL_NET, PF_INET, IPPROTO_UDP, CTL_EOL);
                   1177:
1.116     atatat   1178:        sysctl_createv(clog, 0, NULL, NULL,
                   1179:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.122     atatat   1180:                       CTLTYPE_INT, "checksum",
1.123     heas     1181:                       SYSCTL_DESCR("Compute UDP checksums"),
1.114     atatat   1182:                       NULL, 0, &udpcksum, 0,
                   1183:                       CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_CHECKSUM,
                   1184:                       CTL_EOL);
1.116     atatat   1185:        sysctl_createv(clog, 0, NULL, NULL,
                   1186:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.122     atatat   1187:                       CTLTYPE_INT, "sendspace",
                   1188:                       SYSCTL_DESCR("Default UDP send buffer size"),
1.114     atatat   1189:                       NULL, 0, &udp_sendspace, 0,
                   1190:                       CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_SENDSPACE,
                   1191:                       CTL_EOL);
1.116     atatat   1192:        sysctl_createv(clog, 0, NULL, NULL,
                   1193:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.122     atatat   1194:                       CTLTYPE_INT, "recvspace",
                   1195:                       SYSCTL_DESCR("Default UDP receive buffer size"),
1.114     atatat   1196:                       NULL, 0, &udp_recvspace, 0,
                   1197:                       CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_RECVSPACE,
                   1198:                       CTL_EOL);
1.125     thorpej  1199:        sysctl_createv(clog, 0, NULL, NULL,
                   1200:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1201:                       CTLTYPE_INT, "do_loopback_cksum",
                   1202:                       SYSCTL_DESCR("Perform UDP checksum on loopback"),
                   1203:                       NULL, 0, &udp_do_loopback_cksum, 0,
                   1204:                       CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_LOOPBACKCKSUM,
                   1205:                       CTL_EOL);
1.132     atatat   1206:        sysctl_createv(clog, 0, NULL, NULL,
                   1207:                       CTLFLAG_PERMANENT,
1.134     atatat   1208:                       CTLTYPE_STRUCT, "pcblist",
1.132     atatat   1209:                       SYSCTL_DESCR("UDP protocol control block list"),
                   1210:                       sysctl_inpcblist, 0, &udbtable, 0,
                   1211:                       CTL_NET, PF_INET, IPPROTO_UDP, CTL_CREATE,
                   1212:                       CTL_EOL);
1.139     elad     1213:        sysctl_createv(clog, 0, NULL, NULL,
                   1214:                       CTLFLAG_PERMANENT,
                   1215:                       CTLTYPE_STRUCT, "stats",
                   1216:                       SYSCTL_DESCR("UDP statistics"),
1.166     thorpej  1217:                       sysctl_net_inet_udp_stats, 0, NULL, 0,
1.139     elad     1218:                       CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_STATS,
                   1219:                       CTL_EOL);
1.1       cgd      1220: }
1.72      itojun   1221: #endif
1.130     manu     1222:
1.166     thorpej  1223: void
                   1224: udp_statinc(u_int stat)
                   1225: {
                   1226:
                   1227:        KASSERT(stat < UDP_NSTATS);
                   1228:        UDP_STATINC(stat);
                   1229: }
                   1230:
1.190     christos 1231: #if defined(INET) && defined(IPSEC)
1.130     manu     1232: /*
                   1233:  * Returns:
                   1234:  * 1 if the packet was processed
                   1235:  * 0 if normal UDP processing should take place
1.144     manu     1236:  * -1 if an error occurent and m was freed
1.130     manu     1237:  */
                   1238: static int
1.154     yamt     1239: udp4_espinudp(struct mbuf **mp, int off, struct sockaddr *src,
1.151     christos 1240:     struct socket *so)
1.130     manu     1241: {
                   1242:        size_t len;
1.158     christos 1243:        void *data;
1.130     manu     1244:        struct inpcb *inp;
                   1245:        size_t skip = 0;
                   1246:        size_t minlen;
                   1247:        size_t iphdrlen;
                   1248:        struct ip *ip;
1.136     manu     1249:        struct m_tag *tag;
                   1250:        struct udphdr *udphdr;
                   1251:        u_int16_t sport, dport;
1.144     manu     1252:        struct mbuf *m = *mp;
1.130     manu     1253:
1.131     perry    1254:        /*
1.130     manu     1255:         * Collapse the mbuf chain if the first mbuf is too short
                   1256:         * The longest case is: UDP + non ESP marker + ESP
                   1257:         */
                   1258:        minlen = off + sizeof(u_int64_t) + sizeof(struct esp);
                   1259:        if (minlen > m->m_pkthdr.len)
                   1260:                minlen = m->m_pkthdr.len;
                   1261:
                   1262:        if (m->m_len < minlen) {
1.144     manu     1263:                if ((*mp = m_pullup(m, minlen)) == NULL) {
1.130     manu     1264:                        printf("udp4_espinudp: m_pullup failed\n");
1.144     manu     1265:                        return -1;
1.130     manu     1266:                }
1.144     manu     1267:                m = *mp;
1.130     manu     1268:        }
                   1269:
1.131     perry    1270:        len = m->m_len - off;
1.158     christos 1271:        data = mtod(m, char *) + off;
1.130     manu     1272:        inp = sotoinpcb(so);
                   1273:
                   1274:        /* Ignore keepalive packets */
1.158     christos 1275:        if ((len == 1) && (*(unsigned char *)data == 0xff)) {
1.188     christos 1276:                m_free(m);
                   1277:                *mp = NULL; /* avoid any further processiong by caller ... */
1.130     manu     1278:                return 1;
                   1279:        }
                   1280:
1.131     perry    1281:        /*
                   1282:         * Check that the payload is long enough to hold
1.130     manu     1283:         * an ESP header and compute the length of encapsulation
1.131     perry    1284:         * header to remove
1.130     manu     1285:         */
                   1286:        if (inp->inp_flags & INP_ESPINUDP) {
                   1287:                u_int32_t *st = (u_int32_t *)data;
                   1288:
                   1289:                if ((len <= sizeof(struct esp)) || (*st == 0))
                   1290:                        return 0; /* Normal UDP processing */
                   1291:
                   1292:                skip = sizeof(struct udphdr);
                   1293:        }
                   1294:
                   1295:        if (inp->inp_flags & INP_ESPINUDP_NON_IKE) {
1.142     kleink   1296:                u_int32_t *st = (u_int32_t *)data;
1.130     manu     1297:
                   1298:                if ((len <= sizeof(u_int64_t) + sizeof(struct esp))
1.142     kleink   1299:                    || ((st[0] | st[1]) != 0))
1.130     manu     1300:                        return 0; /* Normal UDP processing */
1.131     perry    1301:
1.130     manu     1302:                skip = sizeof(struct udphdr) + sizeof(u_int64_t);
                   1303:        }
                   1304:
                   1305:        /*
1.136     manu     1306:         * Get the UDP ports. They are handled in network
                   1307:         * order everywhere in IPSEC_NAT_T code.
                   1308:         */
1.158     christos 1309:        udphdr = (struct udphdr *)((char *)data - skip);
1.136     manu     1310:        sport = udphdr->uh_sport;
                   1311:        dport = udphdr->uh_dport;
                   1312:
                   1313:        /*
1.130     manu     1314:         * Remove the UDP header (and possibly the non ESP marker)
                   1315:         * IP header lendth is iphdrlen
1.131     perry    1316:         * Before:
1.130     manu     1317:         *   <--- off --->
                   1318:         *   +----+------+-----+
                   1319:         *   | IP |  UDP | ESP |
                   1320:         *   +----+------+-----+
                   1321:         *        <-skip->
                   1322:         * After:
                   1323:         *          +----+-----+
                   1324:         *          | IP | ESP |
                   1325:         *          +----+-----+
                   1326:         *   <-skip->
                   1327:         */
                   1328:        iphdrlen = off - sizeof(struct udphdr);
1.158     christos 1329:        memmove(mtod(m, char *) + skip, mtod(m, void *), iphdrlen);
1.130     manu     1330:        m_adj(m, skip);
                   1331:
                   1332:        ip = mtod(m, struct ip *);
                   1333:        ip->ip_len = htons(ntohs(ip->ip_len) - skip);
                   1334:        ip->ip_p = IPPROTO_ESP;
                   1335:
                   1336:        /*
1.188     christos 1337:         * We have modified the packet - it is now ESP, so we should not
                   1338:         * return to UDP processing ...
                   1339:         *
1.136     manu     1340:         * Add a PACKET_TAG_IPSEC_NAT_T_PORT tag to remember
                   1341:         * the source UDP port. This is required if we want
                   1342:         * to select the right SPD for multiple hosts behind
                   1343:         * same NAT
                   1344:         */
1.137     manu     1345:        if ((tag = m_tag_get(PACKET_TAG_IPSEC_NAT_T_PORTS,
                   1346:            sizeof(sport) + sizeof(dport), M_DONTWAIT)) == NULL) {
                   1347:                printf("udp4_espinudp: m_tag_get failed\n");
1.188     christos 1348:                m_freem(m);
                   1349:                return -1;
1.137     manu     1350:        }
1.136     manu     1351:        ((u_int16_t *)(tag + 1))[0] = sport;
                   1352:        ((u_int16_t *)(tag + 1))[1] = dport;
1.188     christos 1353:        m_tag_prepend(m, tag);
1.136     manu     1354:
1.199     christos 1355:        if (ipsec_used)
                   1356:                ipsec4_common_input(m, iphdrlen, IPPROTO_ESP);
                   1357:        /* XXX: else */
1.130     manu     1358:
1.185     liamjfoy 1359:        /* We handled it, it shouldn't be handled by UDP */
1.188     christos 1360:        *mp = NULL; /* avoid free by caller ... */
1.130     manu     1361:        return 1;
                   1362: }
                   1363: #endif
1.195     rmind    1364:
1.197     rmind    1365: PR_WRAP_USRREQS(udp)
                   1366: #define        udp_attach      udp_attach_wrapper
                   1367: #define        udp_detach      udp_detach_wrapper
1.208     rtr      1368: #define        udp_accept      udp_accept_wrapper
1.210     rtr      1369: #define        udp_bind        udp_bind_wrapper
                   1370: #define        udp_listen      udp_listen_wrapper
1.211     rtr      1371: #define        udp_connect     udp_connect_wrapper
1.217     rtr      1372: #define        udp_connect2    udp_connect2_wrapper
1.212     rtr      1373: #define        udp_disconnect  udp_disconnect_wrapper
                   1374: #define        udp_shutdown    udp_shutdown_wrapper
                   1375: #define        udp_abort       udp_abort_wrapper
1.200     rtr      1376: #define        udp_ioctl       udp_ioctl_wrapper
1.203     rtr      1377: #define        udp_stat        udp_stat_wrapper
1.207     rtr      1378: #define        udp_peeraddr    udp_peeraddr_wrapper
                   1379: #define        udp_sockaddr    udp_sockaddr_wrapper
1.216     rtr      1380: #define        udp_rcvd        udp_rcvd_wrapper
1.209     rtr      1381: #define        udp_recvoob     udp_recvoob_wrapper
1.215     rtr      1382: #define        udp_send        udp_send_wrapper
1.209     rtr      1383: #define        udp_sendoob     udp_sendoob_wrapper
1.217     rtr      1384: #define        udp_purgeif     udp_purgeif_wrapper
1.195     rmind    1385:
                   1386: const struct pr_usrreqs udp_usrreqs = {
1.196     rmind    1387:        .pr_attach      = udp_attach,
                   1388:        .pr_detach      = udp_detach,
1.208     rtr      1389:        .pr_accept      = udp_accept,
1.210     rtr      1390:        .pr_bind        = udp_bind,
                   1391:        .pr_listen      = udp_listen,
1.211     rtr      1392:        .pr_connect     = udp_connect,
1.217     rtr      1393:        .pr_connect2    = udp_connect2,
1.212     rtr      1394:        .pr_disconnect  = udp_disconnect,
                   1395:        .pr_shutdown    = udp_shutdown,
                   1396:        .pr_abort       = udp_abort,
1.200     rtr      1397:        .pr_ioctl       = udp_ioctl,
1.203     rtr      1398:        .pr_stat        = udp_stat,
1.207     rtr      1399:        .pr_peeraddr    = udp_peeraddr,
                   1400:        .pr_sockaddr    = udp_sockaddr,
1.216     rtr      1401:        .pr_rcvd        = udp_rcvd,
1.209     rtr      1402:        .pr_recvoob     = udp_recvoob,
1.215     rtr      1403:        .pr_send        = udp_send,
1.209     rtr      1404:        .pr_sendoob     = udp_sendoob,
1.217     rtr      1405:        .pr_purgeif     = udp_purgeif,
1.195     rmind    1406: };

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