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Annotation of src/sys/netinet/udp_usrreq.c, Revision 1.186

1.186   ! drochner    1: /*     $NetBSD: udp_usrreq.c,v 1.185 2012/01/09 22:26:44 liamjfoy 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>
1.186   ! drochner   64: __KERNEL_RCSID(0, "$NetBSD: udp_usrreq.c,v 1.185 2012/01/09 22:26:44 liamjfoy Exp $");
1.50      thorpej    65:
1.77      soda       66: #include "opt_inet.h"
1.174     christos   67: #include "opt_compat_netbsd.h"
1.50      thorpej    68: #include "opt_ipsec.h"
1.78      thorpej    69: #include "opt_inet_csum.h"
1.64      ws         70: #include "opt_ipkdb.h"
1.101     martin     71: #include "opt_mbuftrace.h"
1.1       cgd        72:
1.5       mycroft    73: #include <sys/param.h>
                     74: #include <sys/malloc.h>
                     75: #include <sys/mbuf.h>
                     76: #include <sys/protosw.h>
                     77: #include <sys/socket.h>
                     78: #include <sys/socketvar.h>
1.13      mycroft    79: #include <sys/errno.h>
1.5       mycroft    80: #include <sys/stat.h>
1.27      christos   81: #include <sys/systm.h>
                     82: #include <sys/proc.h>
1.53      itojun     83: #include <sys/domain.h>
1.27      christos   84: #include <sys/sysctl.h>
1.1       cgd        85:
1.5       mycroft    86: #include <net/if.h>
                     87: #include <net/route.h>
1.1       cgd        88:
1.5       mycroft    89: #include <netinet/in.h>
                     90: #include <netinet/in_systm.h>
1.15      cgd        91: #include <netinet/in_var.h>
1.5       mycroft    92: #include <netinet/ip.h>
                     93: #include <netinet/in_pcb.h>
                     94: #include <netinet/ip_var.h>
                     95: #include <netinet/ip_icmp.h>
                     96: #include <netinet/udp.h>
                     97: #include <netinet/udp_var.h>
1.166     thorpej    98: #include <netinet/udp_private.h>
1.183     christos   99: #include <netinet/rfc6056.h>
1.1       cgd       100:
1.53      itojun    101: #ifdef INET6
                    102: #include <netinet/ip6.h>
                    103: #include <netinet/icmp6.h>
                    104: #include <netinet6/ip6_var.h>
1.167     thorpej   105: #include <netinet6/ip6_private.h>
1.53      itojun    106: #include <netinet6/in6_pcb.h>
                    107: #include <netinet6/udp6_var.h>
1.168     thorpej   108: #include <netinet6/udp6_private.h>
1.146     rpaulo    109: #include <netinet6/scope6_var.h>
1.53      itojun    110: #endif
                    111:
                    112: #ifndef INET6
                    113: /* always need ip6.h for IP6_EXTHDR_GET */
                    114: #include <netinet/ip6.h>
                    115: #endif
                    116:
1.76      itojun    117: #include "faith.h"
                    118: #if defined(NFAITH) && NFAITH > 0
                    119: #include <net/if_faith.h>
                    120: #endif
                    121:
1.105     jonathan  122: #ifdef FAST_IPSEC
                    123: #include <netipsec/ipsec.h>
1.169     thorpej   124: #include <netipsec/ipsec_var.h>
                    125: #include <netipsec/ipsec_private.h>
1.147     christos  126: #include <netipsec/esp.h>
1.105     jonathan  127: #ifdef INET6
                    128: #include <netipsec/ipsec6.h>
                    129: #endif
1.169     thorpej   130: #endif /* FAST_IPSEC */
1.105     jonathan  131:
1.174     christos  132: #ifdef COMPAT_50
                    133: #include <compat/sys/socket.h>
                    134: #endif
                    135:
1.64      ws        136: #ifdef IPKDB
                    137: #include <ipkdb/ipkdb.h>
                    138: #endif
                    139:
1.8       mycroft   140: /*
                    141:  * UDP protocol implementation.
                    142:  * Per RFC 768, August, 1980.
                    143:  */
                    144: int    udpcksum = 1;
1.141     yamt      145: int    udp_do_loopback_cksum = 0;
1.93      matt      146:
                    147: struct inpcbtable udbtable;
1.164     thorpej   148:
1.166     thorpej   149: percpu_t *udpstat_percpu;
1.8       mycroft   150:
1.72      itojun    151: #ifdef INET
1.130     manu      152: #ifdef IPSEC_NAT_T
1.144     manu      153: static int udp4_espinudp (struct mbuf **, int, struct sockaddr *,
1.130     manu      154:        struct socket *);
                    155: #endif
1.119     matt      156: static void udp4_sendup (struct mbuf *, int, struct sockaddr *,
                    157:        struct socket *);
                    158: static int udp4_realinput (struct sockaddr_in *, struct sockaddr_in *,
1.144     manu      159:        struct mbuf **, int);
1.129     yamt      160: static int udp4_input_checksum(struct mbuf *, const struct udphdr *, int, int);
1.72      itojun    161: #endif
1.53      itojun    162: #ifdef INET6
1.119     matt      163: static void udp6_sendup (struct mbuf *, int, struct sockaddr *,
                    164:        struct socket *);
                    165: static int udp6_realinput (int, struct sockaddr_in6 *,
                    166:        struct sockaddr_in6 *, struct mbuf *, int);
1.129     yamt      167: static int udp6_input_checksum(struct mbuf *, const struct udphdr *, int, int);
1.53      itojun    168: #endif
1.72      itojun    169: #ifdef INET
1.119     matt      170: static void udp_notify (struct inpcb *, int);
1.72      itojun    171: #endif
1.7       mycroft   172:
1.26      mycroft   173: #ifndef UDBHASHSIZE
                    174: #define        UDBHASHSIZE     128
                    175: #endif
                    176: int    udbhashsize = UDBHASHSIZE;
                    177:
1.98      matt      178: #ifdef MBUFTRACE
1.150     dogcow    179: struct mowner udp_mowner = MOWNER_INIT("udp", "");
                    180: struct mowner udp_rx_mowner = MOWNER_INIT("udp", "rx");
                    181: struct mowner udp_tx_mowner = MOWNER_INIT("udp", "tx");
1.98      matt      182: #endif
                    183:
1.78      thorpej   184: #ifdef UDP_CSUM_COUNTERS
                    185: #include <sys/device.h>
                    186:
1.140     yamt      187: #if defined(INET)
1.78      thorpej   188: struct evcnt udp_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    189:     NULL, "udp", "hwcsum bad");
                    190: struct evcnt udp_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    191:     NULL, "udp", "hwcsum ok");
                    192: struct evcnt udp_hwcsum_data = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    193:     NULL, "udp", "hwcsum data");
                    194: struct evcnt udp_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    195:     NULL, "udp", "swcsum");
                    196:
1.120     matt      197: EVCNT_ATTACH_STATIC(udp_hwcsum_bad);
                    198: EVCNT_ATTACH_STATIC(udp_hwcsum_ok);
                    199: EVCNT_ATTACH_STATIC(udp_hwcsum_data);
                    200: EVCNT_ATTACH_STATIC(udp_swcsum);
1.140     yamt      201: #endif /* defined(INET) */
                    202:
                    203: #if defined(INET6)
                    204: struct evcnt udp6_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    205:     NULL, "udp6", "hwcsum bad");
                    206: struct evcnt udp6_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    207:     NULL, "udp6", "hwcsum ok");
                    208: struct evcnt udp6_hwcsum_data = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    209:     NULL, "udp6", "hwcsum data");
                    210: struct evcnt udp6_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    211:     NULL, "udp6", "swcsum");
                    212:
                    213: EVCNT_ATTACH_STATIC(udp6_hwcsum_bad);
                    214: EVCNT_ATTACH_STATIC(udp6_hwcsum_ok);
                    215: EVCNT_ATTACH_STATIC(udp6_hwcsum_data);
                    216: EVCNT_ATTACH_STATIC(udp6_swcsum);
                    217: #endif /* defined(INET6) */
                    218:
                    219: #define        UDP_CSUM_COUNTER_INCR(ev)       (ev)->ev_count++
1.120     matt      220:
1.78      thorpej   221: #else
                    222:
                    223: #define        UDP_CSUM_COUNTER_INCR(ev)       /* nothing */
                    224:
                    225: #endif /* UDP_CSUM_COUNTERS */
                    226:
1.179     pooka     227: static void sysctl_net_inet_udp_setup(struct sysctllog **);
                    228:
1.7       mycroft   229: void
1.119     matt      230: udp_init(void)
1.1       cgd       231: {
1.18      mycroft   232:
1.179     pooka     233:        sysctl_net_inet_udp_setup(NULL);
                    234:
1.35      mycroft   235:        in_pcbinit(&udbtable, udbhashsize, udbhashsize);
1.78      thorpej   236:
1.98      matt      237:        MOWNER_ATTACH(&udp_tx_mowner);
                    238:        MOWNER_ATTACH(&udp_rx_mowner);
                    239:        MOWNER_ATTACH(&udp_mowner);
1.166     thorpej   240:
1.171     yamt      241: #ifdef INET
1.166     thorpej   242:        udpstat_percpu = percpu_alloc(sizeof(uint64_t) * UDP_NSTATS);
1.171     yamt      243: #endif
                    244: #ifdef INET6
                    245:        udp6stat_percpu = percpu_alloc(sizeof(uint64_t) * UDP6_NSTATS);
                    246: #endif
1.1       cgd       247: }
                    248:
1.129     yamt      249: /*
                    250:  * Checksum extended UDP header and data.
                    251:  */
                    252:
                    253: int
                    254: udp_input_checksum(int af, struct mbuf *m, const struct udphdr *uh,
                    255:     int iphlen, int len)
                    256: {
                    257:
                    258:        switch (af) {
1.72      itojun    259: #ifdef INET
1.129     yamt      260:        case AF_INET:
                    261:                return udp4_input_checksum(m, uh, iphlen, len);
                    262: #endif
                    263: #ifdef INET6
                    264:        case AF_INET6:
                    265:                return udp6_input_checksum(m, uh, iphlen, len);
                    266: #endif
                    267:        }
                    268: #ifdef DIAGNOSTIC
                    269:        panic("udp_input_checksum: unknown af %d", af);
                    270: #endif
                    271:        /* NOTREACHED */
                    272:        return -1;
                    273: }
                    274:
                    275: #ifdef INET
                    276:
                    277: /*
                    278:  * Checksum extended UDP header and data.
                    279:  */
                    280:
                    281: static int
                    282: udp4_input_checksum(struct mbuf *m, const struct udphdr *uh,
                    283:     int iphlen, int len)
                    284: {
                    285:
                    286:        /*
                    287:         * XXX it's better to record and check if this mbuf is
                    288:         * already checked.
                    289:         */
                    290:
                    291:        if (uh->uh_sum == 0)
                    292:                return 0;
                    293:
                    294:        switch (m->m_pkthdr.csum_flags &
                    295:            ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_UDPv4) |
                    296:            M_CSUM_TCP_UDP_BAD | M_CSUM_DATA)) {
                    297:        case M_CSUM_UDPv4|M_CSUM_TCP_UDP_BAD:
                    298:                UDP_CSUM_COUNTER_INCR(&udp_hwcsum_bad);
                    299:                goto badcsum;
                    300:
                    301:        case M_CSUM_UDPv4|M_CSUM_DATA: {
                    302:                u_int32_t hw_csum = m->m_pkthdr.csum_data;
                    303:
                    304:                UDP_CSUM_COUNTER_INCR(&udp_hwcsum_data);
                    305:                if (m->m_pkthdr.csum_flags & M_CSUM_NO_PSEUDOHDR) {
                    306:                        const struct ip *ip =
                    307:                            mtod(m, const struct ip *);
                    308:
                    309:                        hw_csum = in_cksum_phdr(ip->ip_src.s_addr,
                    310:                            ip->ip_dst.s_addr,
                    311:                            htons(hw_csum + len + IPPROTO_UDP));
                    312:                }
                    313:                if ((hw_csum ^ 0xffff) != 0)
                    314:                        goto badcsum;
                    315:                break;
                    316:        }
                    317:
                    318:        case M_CSUM_UDPv4:
                    319:                /* Checksum was okay. */
                    320:                UDP_CSUM_COUNTER_INCR(&udp_hwcsum_ok);
                    321:                break;
                    322:
                    323:        default:
                    324:                /*
                    325:                 * Need to compute it ourselves.  Maybe skip checksum
                    326:                 * on loopback interfaces.
                    327:                 */
                    328:                if (__predict_true(!(m->m_pkthdr.rcvif->if_flags &
                    329:                                     IFF_LOOPBACK) ||
                    330:                                   udp_do_loopback_cksum)) {
                    331:                        UDP_CSUM_COUNTER_INCR(&udp_swcsum);
                    332:                        if (in4_cksum(m, IPPROTO_UDP, iphlen, len) != 0)
                    333:                                goto badcsum;
                    334:                }
                    335:                break;
                    336:        }
                    337:
                    338:        return 0;
                    339:
                    340: badcsum:
1.166     thorpej   341:        UDP_STATINC(UDP_STAT_BADSUM);
1.129     yamt      342:        return -1;
                    343: }
                    344:
1.7       mycroft   345: void
1.27      christos  346: udp_input(struct mbuf *m, ...)
1.1       cgd       347: {
1.53      itojun    348:        va_list ap;
                    349:        struct sockaddr_in src, dst;
                    350:        struct ip *ip;
                    351:        struct udphdr *uh;
1.97      simonb    352:        int iphlen;
1.53      itojun    353:        int len;
                    354:        int n;
1.96      itojun    355:        u_int16_t ip_len;
1.53      itojun    356:
                    357:        va_start(ap, m);
                    358:        iphlen = va_arg(ap, int);
1.97      simonb    359:        (void)va_arg(ap, int);          /* ignore value, advance ap */
1.53      itojun    360:        va_end(ap);
                    361:
1.98      matt      362:        MCLAIM(m, &udp_rx_mowner);
1.166     thorpej   363:        UDP_STATINC(UDP_STAT_IPACKETS);
1.53      itojun    364:
                    365:        /*
                    366:         * Get IP and UDP header together in first mbuf.
                    367:         */
                    368:        ip = mtod(m, struct ip *);
                    369:        IP6_EXTHDR_GET(uh, struct udphdr *, m, iphlen, sizeof(struct udphdr));
                    370:        if (uh == NULL) {
1.166     thorpej   371:                UDP_STATINC(UDP_STAT_HDROPS);
1.53      itojun    372:                return;
                    373:        }
1.95      thorpej   374:        KASSERT(UDP_HDR_ALIGNED_P(uh));
1.53      itojun    375:
1.57      itojun    376:        /* destination port of 0 is illegal, based on RFC768. */
                    377:        if (uh->uh_dport == 0)
                    378:                goto bad;
                    379:
1.53      itojun    380:        /*
                    381:         * Make mbuf data length reflect UDP length.
                    382:         * If not enough data to reflect UDP length, drop.
                    383:         */
1.96      itojun    384:        ip_len = ntohs(ip->ip_len);
1.53      itojun    385:        len = ntohs((u_int16_t)uh->uh_ulen);
1.96      itojun    386:        if (ip_len != iphlen + len) {
                    387:                if (ip_len < iphlen + len || len < sizeof(struct udphdr)) {
1.166     thorpej   388:                        UDP_STATINC(UDP_STAT_BADLEN);
1.53      itojun    389:                        goto bad;
                    390:                }
1.96      itojun    391:                m_adj(m, iphlen + len - ip_len);
1.53      itojun    392:        }
                    393:
                    394:        /*
                    395:         * Checksum extended UDP header and data.
                    396:         */
1.129     yamt      397:        if (udp4_input_checksum(m, uh, iphlen, len))
                    398:                goto badcsum;
1.53      itojun    399:
                    400:        /* construct source and dst sockaddrs. */
1.159     dyoung    401:        sockaddr_in_init(&src, &ip->ip_src, uh->uh_sport);
                    402:        sockaddr_in_init(&dst, &ip->ip_dst, uh->uh_dport);
1.53      itojun    403:
1.144     manu      404:        if ((n = udp4_realinput(&src, &dst, &m, iphlen)) == -1) {
1.166     thorpej   405:                UDP_STATINC(UDP_STAT_HDROPS);
1.144     manu      406:                return;
                    407:        }
1.53      itojun    408: #ifdef INET6
                    409:        if (IN_MULTICAST(ip->ip_dst.s_addr) || n == 0) {
                    410:                struct sockaddr_in6 src6, dst6;
                    411:
1.175     cegger    412:                memset(&src6, 0, sizeof(src6));
1.53      itojun    413:                src6.sin6_family = AF_INET6;
                    414:                src6.sin6_len = sizeof(struct sockaddr_in6);
                    415:                src6.sin6_addr.s6_addr[10] = src6.sin6_addr.s6_addr[11] = 0xff;
1.177     tsutsui   416:                memcpy(&src6.sin6_addr.s6_addr[12], &ip->ip_src,
1.53      itojun    417:                        sizeof(ip->ip_src));
                    418:                src6.sin6_port = uh->uh_sport;
1.175     cegger    419:                memset(&dst6, 0, sizeof(dst6));
1.53      itojun    420:                dst6.sin6_family = AF_INET6;
                    421:                dst6.sin6_len = sizeof(struct sockaddr_in6);
                    422:                dst6.sin6_addr.s6_addr[10] = dst6.sin6_addr.s6_addr[11] = 0xff;
1.177     tsutsui   423:                memcpy(&dst6.sin6_addr.s6_addr[12], &ip->ip_dst,
1.53      itojun    424:                        sizeof(ip->ip_dst));
                    425:                dst6.sin6_port = uh->uh_dport;
                    426:
                    427:                n += udp6_realinput(AF_INET, &src6, &dst6, m, iphlen);
                    428:        }
                    429: #endif
                    430:
                    431:        if (n == 0) {
                    432:                if (m->m_flags & (M_BCAST | M_MCAST)) {
1.166     thorpej   433:                        UDP_STATINC(UDP_STAT_NOPORTBCAST);
1.53      itojun    434:                        goto bad;
                    435:                }
1.166     thorpej   436:                UDP_STATINC(UDP_STAT_NOPORT);
1.64      ws        437: #ifdef IPKDB
1.53      itojun    438:                if (checkipkdb(&ip->ip_src, uh->uh_sport, uh->uh_dport,
                    439:                                m, iphlen + sizeof(struct udphdr),
                    440:                                m->m_pkthdr.len - iphlen - sizeof(struct udphdr))) {
                    441:                        /*
                    442:                         * It was a debugger connect packet,
                    443:                         * just drop it now
                    444:                         */
                    445:                        goto bad;
                    446:                }
                    447: #endif
                    448:                icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0);
                    449:                m = NULL;
                    450:        }
                    451:
                    452: bad:
                    453:        if (m)
                    454:                m_freem(m);
1.78      thorpej   455:        return;
                    456:
                    457: badcsum:
                    458:        m_freem(m);
1.53      itojun    459: }
1.72      itojun    460: #endif
1.53      itojun    461:
                    462: #ifdef INET6
1.129     yamt      463: static int
                    464: udp6_input_checksum(struct mbuf *m, const struct udphdr *uh, int off, int len)
                    465: {
                    466:
1.140     yamt      467:        /*
                    468:         * XXX it's better to record and check if this mbuf is
                    469:         * already checked.
                    470:         */
                    471:
1.129     yamt      472:        if (__predict_false((m->m_flags & M_LOOP) && !udp_do_loopback_cksum)) {
                    473:                goto good;
                    474:        }
                    475:        if (uh->uh_sum == 0) {
1.168     thorpej   476:                UDP6_STATINC(UDP6_STAT_NOSUM);
1.129     yamt      477:                goto bad;
                    478:        }
1.140     yamt      479:
                    480:        switch (m->m_pkthdr.csum_flags &
                    481:            ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_UDPv6) |
                    482:            M_CSUM_TCP_UDP_BAD | M_CSUM_DATA)) {
                    483:        case M_CSUM_UDPv6|M_CSUM_TCP_UDP_BAD:
                    484:                UDP_CSUM_COUNTER_INCR(&udp6_hwcsum_bad);
1.168     thorpej   485:                UDP6_STATINC(UDP6_STAT_BADSUM);
1.129     yamt      486:                goto bad;
1.140     yamt      487:
                    488: #if 0 /* notyet */
                    489:        case M_CSUM_UDPv6|M_CSUM_DATA:
                    490: #endif
                    491:
                    492:        case M_CSUM_UDPv6:
                    493:                /* Checksum was okay. */
                    494:                UDP_CSUM_COUNTER_INCR(&udp6_hwcsum_ok);
                    495:                break;
                    496:
                    497:        default:
                    498:                /*
                    499:                 * Need to compute it ourselves.  Maybe skip checksum
                    500:                 * on loopback interfaces.
                    501:                 */
                    502:                UDP_CSUM_COUNTER_INCR(&udp6_swcsum);
                    503:                if (in6_cksum(m, IPPROTO_UDP, off, len) != 0) {
1.168     thorpej   504:                        UDP6_STATINC(UDP6_STAT_BADSUM);
1.140     yamt      505:                        goto bad;
                    506:                }
1.129     yamt      507:        }
                    508:
                    509: good:
                    510:        return 0;
                    511: bad:
                    512:        return -1;
                    513: }
                    514:
1.53      itojun    515: int
1.154     yamt      516: udp6_input(struct mbuf **mp, int *offp, int proto)
1.53      itojun    517: {
                    518:        struct mbuf *m = *mp;
                    519:        int off = *offp;
                    520:        struct sockaddr_in6 src, dst;
                    521:        struct ip6_hdr *ip6;
                    522:        struct udphdr *uh;
                    523:        u_int32_t plen, ulen;
                    524:
1.76      itojun    525:        ip6 = mtod(m, struct ip6_hdr *);
                    526:
1.53      itojun    527: #if defined(NFAITH) && 0 < NFAITH
1.76      itojun    528:        if (faithprefix(&ip6->ip6_dst)) {
                    529:                /* send icmp6 host unreach? */
                    530:                m_freem(m);
                    531:                return IPPROTO_DONE;
1.53      itojun    532:        }
                    533: #endif
                    534:
1.168     thorpej   535:        UDP6_STATINC(UDP6_STAT_IPACKETS);
1.53      itojun    536:
                    537:        /* check for jumbogram is done in ip6_input.  we can trust pkthdr.len */
                    538:        plen = m->m_pkthdr.len - off;
                    539:        IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(struct udphdr));
                    540:        if (uh == NULL) {
1.167     thorpej   541:                IP6_STATINC(IP6_STAT_TOOSHORT);
1.53      itojun    542:                return IPPROTO_DONE;
                    543:        }
1.95      thorpej   544:        KASSERT(UDP_HDR_ALIGNED_P(uh));
1.53      itojun    545:        ulen = ntohs((u_short)uh->uh_ulen);
1.69      itojun    546:        /*
                    547:         * RFC2675 section 4: jumbograms will have 0 in the UDP header field,
                    548:         * iff payload length > 0xffff.
                    549:         */
1.53      itojun    550:        if (ulen == 0 && plen > 0xffff)
                    551:                ulen = plen;
                    552:
                    553:        if (plen != ulen) {
1.168     thorpej   554:                UDP6_STATINC(UDP6_STAT_BADLEN);
1.54      itojun    555:                goto bad;
                    556:        }
                    557:
1.57      itojun    558:        /* destination port of 0 is illegal, based on RFC768. */
                    559:        if (uh->uh_dport == 0)
                    560:                goto bad;
                    561:
1.54      itojun    562:        /* Be proactive about malicious use of IPv4 mapped address */
                    563:        if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
                    564:            IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
                    565:                /* XXX stat */
1.53      itojun    566:                goto bad;
                    567:        }
                    568:
                    569:        /*
1.125     thorpej   570:         * Checksum extended UDP header and data.  Maybe skip checksum
                    571:         * on loopback interfaces.
1.53      itojun    572:         */
1.129     yamt      573:        if (udp6_input_checksum(m, uh, off, ulen))
                    574:                goto bad;
1.53      itojun    575:
                    576:        /*
                    577:         * Construct source and dst sockaddrs.
                    578:         */
1.175     cegger    579:        memset(&src, 0, sizeof(src));
1.53      itojun    580:        src.sin6_family = AF_INET6;
                    581:        src.sin6_len = sizeof(struct sockaddr_in6);
1.146     rpaulo    582:        src.sin6_addr = ip6->ip6_src;
1.53      itojun    583:        src.sin6_port = uh->uh_sport;
1.175     cegger    584:        memset(&dst, 0, sizeof(dst));
1.53      itojun    585:        dst.sin6_family = AF_INET6;
                    586:        dst.sin6_len = sizeof(struct sockaddr_in6);
1.146     rpaulo    587:        dst.sin6_addr = ip6->ip6_dst;
1.53      itojun    588:        dst.sin6_port = uh->uh_dport;
                    589:
                    590:        if (udp6_realinput(AF_INET6, &src, &dst, m, off) == 0) {
                    591:                if (m->m_flags & M_MCAST) {
1.168     thorpej   592:                        UDP6_STATINC(UDP6_STAT_NOPORTMCAST);
1.53      itojun    593:                        goto bad;
                    594:                }
1.168     thorpej   595:                UDP6_STATINC(UDP6_STAT_NOPORT);
1.53      itojun    596:                icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
                    597:                m = NULL;
                    598:        }
                    599:
                    600: bad:
                    601:        if (m)
                    602:                m_freem(m);
                    603:        return IPPROTO_DONE;
                    604: }
                    605: #endif
                    606:
1.72      itojun    607: #ifdef INET
1.53      itojun    608: static void
1.119     matt      609: udp4_sendup(struct mbuf *m, int off /* offset of data portion */,
                    610:        struct sockaddr *src, struct socket *so)
1.53      itojun    611: {
                    612:        struct mbuf *opts = NULL;
                    613:        struct mbuf *n;
                    614:        struct inpcb *inp = NULL;
                    615:
                    616:        if (!so)
                    617:                return;
                    618:        switch (so->so_proto->pr_domain->dom_family) {
                    619:        case AF_INET:
                    620:                inp = sotoinpcb(so);
                    621:                break;
                    622: #ifdef INET6
                    623:        case AF_INET6:
                    624:                break;
                    625: #endif
                    626:        default:
                    627:                return;
                    628:        }
                    629:
1.186   ! drochner  630: #if defined(FAST_IPSEC)
1.53      itojun    631:        /* check AH/ESP integrity. */
                    632:        if (so != NULL && ipsec4_in_reject_so(m, so)) {
1.169     thorpej   633:                IPSEC_STATINC(IPSEC_STAT_IN_POLVIO);
1.162     dyoung    634:                if ((n = m_copypacket(m, M_DONTWAIT)) != NULL)
1.110     itojun    635:                        icmp_error(n, ICMP_UNREACH, ICMP_UNREACH_ADMIN_PROHIBIT,
                    636:                            0, 0);
1.53      itojun    637:                return;
                    638:        }
                    639: #endif /*IPSEC*/
                    640:
1.162     dyoung    641:        if ((n = m_copypacket(m, M_DONTWAIT)) != NULL) {
1.53      itojun    642:                if (inp && (inp->inp_flags & INP_CONTROLOPTS
1.174     christos  643: #ifdef SO_OTIMESTAMP
                    644:                         || so->so_options & SO_OTIMESTAMP
                    645: #endif
1.53      itojun    646:                         || so->so_options & SO_TIMESTAMP)) {
                    647:                        struct ip *ip = mtod(n, struct ip *);
                    648:                        ip_savecontrol(inp, &opts, ip, n);
                    649:                }
                    650:
                    651:                m_adj(n, off);
                    652:                if (sbappendaddr(&so->so_rcv, src, n,
                    653:                                opts) == 0) {
                    654:                        m_freem(n);
                    655:                        if (opts)
                    656:                                m_freem(opts);
1.124     darrenr   657:                        so->so_rcv.sb_overflowed++;
1.166     thorpej   658:                        UDP_STATINC(UDP_STAT_FULLSOCK);
1.53      itojun    659:                } else
                    660:                        sorwakeup(so);
                    661:        }
                    662: }
1.72      itojun    663: #endif
1.53      itojun    664:
                    665: #ifdef INET6
                    666: static void
1.119     matt      667: udp6_sendup(struct mbuf *m, int off /* offset of data portion */,
                    668:        struct sockaddr *src, struct socket *so)
1.53      itojun    669: {
                    670:        struct mbuf *opts = NULL;
                    671:        struct mbuf *n;
                    672:        struct in6pcb *in6p = NULL;
                    673:
                    674:        if (!so)
                    675:                return;
                    676:        if (so->so_proto->pr_domain->dom_family != AF_INET6)
                    677:                return;
                    678:        in6p = sotoin6pcb(so);
                    679:
1.186   ! drochner  680: #if defined(FAST_IPSEC)
1.53      itojun    681:        /* check AH/ESP integrity. */
                    682:        if (so != NULL && ipsec6_in_reject_so(m, so)) {
1.169     thorpej   683:                IPSEC6_STATINC(IPSEC_STAT_IN_POLVIO);
1.162     dyoung    684:                if ((n = m_copypacket(m, M_DONTWAIT)) != NULL)
1.110     itojun    685:                        icmp6_error(n, ICMP6_DST_UNREACH,
                    686:                            ICMP6_DST_UNREACH_ADMIN, 0);
1.53      itojun    687:                return;
                    688:        }
                    689: #endif /*IPSEC*/
                    690:
1.162     dyoung    691:        if ((n = m_copypacket(m, M_DONTWAIT)) != NULL) {
1.53      itojun    692:                if (in6p && (in6p->in6p_flags & IN6P_CONTROLOPTS
1.174     christos  693: #ifdef SO_OTIMESTAMP
                    694:                    || in6p->in6p_socket->so_options & SO_OTIMESTAMP
                    695: #endif
                    696:                    || in6p->in6p_socket->so_options & SO_TIMESTAMP)) {
1.53      itojun    697:                        struct ip6_hdr *ip6 = mtod(n, struct ip6_hdr *);
                    698:                        ip6_savecontrol(in6p, &opts, ip6, n);
                    699:                }
                    700:
                    701:                m_adj(n, off);
                    702:                if (sbappendaddr(&so->so_rcv, src, n, opts) == 0) {
                    703:                        m_freem(n);
                    704:                        if (opts)
                    705:                                m_freem(opts);
1.124     darrenr   706:                        so->so_rcv.sb_overflowed++;
1.168     thorpej   707:                        UDP6_STATINC(UDP6_STAT_FULLSOCK);
1.53      itojun    708:                } else
                    709:                        sorwakeup(so);
                    710:        }
                    711: }
                    712: #endif
                    713:
1.72      itojun    714: #ifdef INET
1.53      itojun    715: static int
1.119     matt      716: udp4_realinput(struct sockaddr_in *src, struct sockaddr_in *dst,
1.144     manu      717:        struct mbuf **mp, int off /* offset of udphdr */)
1.53      itojun    718: {
                    719:        u_int16_t *sport, *dport;
                    720:        int rcvcnt;
                    721:        struct in_addr *src4, *dst4;
1.109     itojun    722:        struct inpcb_hdr *inph;
1.53      itojun    723:        struct inpcb *inp;
1.144     manu      724:        struct mbuf *m = *mp;
1.53      itojun    725:
                    726:        rcvcnt = 0;
                    727:        off += sizeof(struct udphdr);   /* now, offset of payload */
                    728:
                    729:        if (src->sin_family != AF_INET || dst->sin_family != AF_INET)
                    730:                goto bad;
                    731:
                    732:        src4 = &src->sin_addr;
                    733:        sport = &src->sin_port;
                    734:        dst4 = &dst->sin_addr;
                    735:        dport = &dst->sin_port;
                    736:
1.73      itojun    737:        if (IN_MULTICAST(dst4->s_addr) ||
1.53      itojun    738:            in_broadcast(*dst4, m->m_pkthdr.rcvif)) {
                    739:                /*
                    740:                 * Deliver a multicast or broadcast datagram to *all* sockets
                    741:                 * for which the local and remote addresses and ports match
                    742:                 * those of the incoming datagram.  This allows more than
                    743:                 * one process to receive multi/broadcasts on the same port.
                    744:                 * (This really ought to be done for unicast datagrams as
                    745:                 * well, but that would cause problems with existing
                    746:                 * applications that open both address-specific sockets and
                    747:                 * a wildcard socket listening to the same port -- they would
                    748:                 * end up receiving duplicates of every unicast datagram.
                    749:                 * Those applications open the multiple sockets to overcome an
                    750:                 * inadequacy of the UDP socket interface, but for backwards
                    751:                 * compatibility we avoid the problem here rather than
                    752:                 * fixing the interface.  Maybe 4.5BSD will remedy this?)
                    753:                 */
                    754:
                    755:                /*
1.92      itojun    756:                 * KAME note: traditionally we dropped udpiphdr from mbuf here.
1.71      itojun    757:                 * we need udpiphdr for IPsec processing so we do that later.
1.53      itojun    758:                 */
                    759:                /*
                    760:                 * Locate pcb(s) for datagram.
                    761:                 */
1.109     itojun    762:                CIRCLEQ_FOREACH(inph, &udbtable.inpt_queue, inph_queue) {
                    763:                        inp = (struct inpcb *)inph;
                    764:                        if (inp->inp_af != AF_INET)
                    765:                                continue;
                    766:
1.53      itojun    767:                        if (inp->inp_lport != *dport)
                    768:                                continue;
                    769:                        if (!in_nullhost(inp->inp_laddr)) {
                    770:                                if (!in_hosteq(inp->inp_laddr, *dst4))
                    771:                                        continue;
                    772:                        }
                    773:                        if (!in_nullhost(inp->inp_faddr)) {
                    774:                                if (!in_hosteq(inp->inp_faddr, *src4) ||
                    775:                                    inp->inp_fport != *sport)
                    776:                                        continue;
                    777:                        }
                    778:
                    779:                        udp4_sendup(m, off, (struct sockaddr *)src,
                    780:                                inp->inp_socket);
                    781:                        rcvcnt++;
                    782:
                    783:                        /*
                    784:                         * Don't look for additional matches if this one does
                    785:                         * not have either the SO_REUSEPORT or SO_REUSEADDR
                    786:                         * socket options set.  This heuristic avoids searching
                    787:                         * through all pcbs in the common case of a non-shared
                    788:                         * port.  It assumes that an application will never
                    789:                         * clear these options after setting them.
                    790:                         */
                    791:                        if ((inp->inp_socket->so_options &
                    792:                            (SO_REUSEPORT|SO_REUSEADDR)) == 0)
                    793:                                break;
                    794:                }
                    795:        } else {
                    796:                /*
                    797:                 * Locate pcb for datagram.
                    798:                 */
1.180     dyoung    799:                inp = in_pcblookup_connect(&udbtable, *src4, *sport, *dst4,
                    800:                    *dport, 0);
1.53      itojun    801:                if (inp == 0) {
1.166     thorpej   802:                        UDP_STATINC(UDP_STAT_PCBHASHMISS);
1.53      itojun    803:                        inp = in_pcblookup_bind(&udbtable, *dst4, *dport);
1.82      itojun    804:                        if (inp == 0)
1.53      itojun    805:                                return rcvcnt;
                    806:                }
                    807:
1.130     manu      808: #ifdef IPSEC_NAT_T
                    809:                /* Handle ESP over UDP */
                    810:                if (inp->inp_flags & INP_ESPINUDP_ALL) {
                    811:                        struct sockaddr *sa = (struct sockaddr *)src;
                    812:
1.144     manu      813:                        switch(udp4_espinudp(mp, off, sa, inp->inp_socket)) {
                    814:                        case -1:        /* Error, m was freeed */
                    815:                                rcvcnt = -1;
                    816:                                goto bad;
                    817:                                break;
                    818:
                    819:                        case 1:         /* ESP over UDP */
1.130     manu      820:                                rcvcnt++;
                    821:                                goto bad;
1.144     manu      822:                                break;
                    823:
                    824:                        case 0:         /* plain UDP */
                    825:                        default:        /* Unexpected */
                    826:                                /*
                    827:                                 * Normal UDP processing will take place
                    828:                                 * m may have changed.
                    829:                                 */
                    830:                                m = *mp;
                    831:                                break;
1.130     manu      832:                        }
                    833:                }
                    834: #endif
                    835:
1.178     minskim   836:                /*
                    837:                 * Check the minimum TTL for socket.
                    838:                 */
                    839:                if (mtod(m, struct ip *)->ip_ttl < inp->inp_ip_minttl)
                    840:                        goto bad;
                    841:
1.53      itojun    842:                udp4_sendup(m, off, (struct sockaddr *)src, inp->inp_socket);
                    843:                rcvcnt++;
                    844:        }
                    845:
                    846: bad:
                    847:        return rcvcnt;
                    848: }
1.72      itojun    849: #endif
1.53      itojun    850:
                    851: #ifdef INET6
                    852: static int
1.119     matt      853: udp6_realinput(int af, struct sockaddr_in6 *src, struct sockaddr_in6 *dst,
                    854:        struct mbuf *m, int off)
1.53      itojun    855: {
1.79      itojun    856:        u_int16_t sport, dport;
1.53      itojun    857:        int rcvcnt;
1.146     rpaulo    858:        struct in6_addr src6, *dst6;
1.79      itojun    859:        const struct in_addr *dst4;
1.109     itojun    860:        struct inpcb_hdr *inph;
1.53      itojun    861:        struct in6pcb *in6p;
                    862:
                    863:        rcvcnt = 0;
                    864:        off += sizeof(struct udphdr);   /* now, offset of payload */
                    865:
                    866:        if (af != AF_INET && af != AF_INET6)
                    867:                goto bad;
                    868:        if (src->sin6_family != AF_INET6 || dst->sin6_family != AF_INET6)
                    869:                goto bad;
                    870:
1.146     rpaulo    871:        src6 = src->sin6_addr;
                    872:        if (sa6_recoverscope(src) != 0) {
                    873:                /* XXX: should be impossible. */
                    874:                goto bad;
                    875:        }
1.79      itojun    876:        sport = src->sin6_port;
1.146     rpaulo    877:
1.79      itojun    878:        dport = dst->sin6_port;
1.88      itojun    879:        dst4 = (struct in_addr *)&dst->sin6_addr.s6_addr[12];
1.146     rpaulo    880:        dst6 = &dst->sin6_addr;
1.53      itojun    881:
1.146     rpaulo    882:        if (IN6_IS_ADDR_MULTICAST(dst6) ||
1.79      itojun    883:            (af == AF_INET && IN_MULTICAST(dst4->s_addr))) {
1.53      itojun    884:                /*
                    885:                 * Deliver a multicast or broadcast datagram to *all* sockets
                    886:                 * for which the local and remote addresses and ports match
                    887:                 * those of the incoming datagram.  This allows more than
                    888:                 * one process to receive multi/broadcasts on the same port.
                    889:                 * (This really ought to be done for unicast datagrams as
                    890:                 * well, but that would cause problems with existing
                    891:                 * applications that open both address-specific sockets and
                    892:                 * a wildcard socket listening to the same port -- they would
                    893:                 * end up receiving duplicates of every unicast datagram.
                    894:                 * Those applications open the multiple sockets to overcome an
                    895:                 * inadequacy of the UDP socket interface, but for backwards
                    896:                 * compatibility we avoid the problem here rather than
                    897:                 * fixing the interface.  Maybe 4.5BSD will remedy this?)
                    898:                 */
                    899:
                    900:                /*
1.92      itojun    901:                 * KAME note: traditionally we dropped udpiphdr from mbuf here.
1.71      itojun    902:                 * we need udpiphdr for IPsec processing so we do that later.
1.53      itojun    903:                 */
                    904:                /*
                    905:                 * Locate pcb(s) for datagram.
                    906:                 */
1.109     itojun    907:                CIRCLEQ_FOREACH(inph, &udbtable.inpt_queue, inph_queue) {
                    908:                        in6p = (struct in6pcb *)inph;
                    909:                        if (in6p->in6p_af != AF_INET6)
                    910:                                continue;
                    911:
1.79      itojun    912:                        if (in6p->in6p_lport != dport)
1.53      itojun    913:                                continue;
                    914:                        if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) {
1.146     rpaulo    915:                                if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr,
                    916:                                    dst6))
1.53      itojun    917:                                        continue;
1.92      itojun    918:                        } else {
1.146     rpaulo    919:                                if (IN6_IS_ADDR_V4MAPPED(dst6) &&
1.85      itojun    920:                                    (in6p->in6p_flags & IN6P_IPV6_V6ONLY))
1.55      itojun    921:                                        continue;
                    922:                        }
1.53      itojun    923:                        if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
1.79      itojun    924:                                if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr,
                    925:                                    &src6) || in6p->in6p_fport != sport)
1.53      itojun    926:                                        continue;
1.92      itojun    927:                        } else {
1.79      itojun    928:                                if (IN6_IS_ADDR_V4MAPPED(&src6) &&
1.85      itojun    929:                                    (in6p->in6p_flags & IN6P_IPV6_V6ONLY))
1.55      itojun    930:                                        continue;
                    931:                        }
1.53      itojun    932:
                    933:                        udp6_sendup(m, off, (struct sockaddr *)src,
                    934:                                in6p->in6p_socket);
                    935:                        rcvcnt++;
                    936:
                    937:                        /*
                    938:                         * Don't look for additional matches if this one does
                    939:                         * not have either the SO_REUSEPORT or SO_REUSEADDR
                    940:                         * socket options set.  This heuristic avoids searching
                    941:                         * through all pcbs in the common case of a non-shared
                    942:                         * port.  It assumes that an application will never
                    943:                         * clear these options after setting them.
                    944:                         */
                    945:                        if ((in6p->in6p_socket->so_options &
                    946:                            (SO_REUSEPORT|SO_REUSEADDR)) == 0)
                    947:                                break;
                    948:                }
                    949:        } else {
                    950:                /*
                    951:                 * Locate pcb for datagram.
                    952:                 */
1.146     rpaulo    953:                in6p = in6_pcblookup_connect(&udbtable, &src6, sport, dst6,
1.180     dyoung    954:                                             dport, 0, 0);
1.53      itojun    955:                if (in6p == 0) {
1.166     thorpej   956:                        UDP_STATINC(UDP_STAT_PCBHASHMISS);
1.146     rpaulo    957:                        in6p = in6_pcblookup_bind(&udbtable, dst6, dport, 0);
1.82      itojun    958:                        if (in6p == 0)
1.53      itojun    959:                                return rcvcnt;
                    960:                }
                    961:
                    962:                udp6_sendup(m, off, (struct sockaddr *)src, in6p->in6p_socket);
                    963:                rcvcnt++;
                    964:        }
                    965:
                    966: bad:
                    967:        return rcvcnt;
                    968: }
                    969: #endif
1.1       cgd       970:
1.72      itojun    971: #ifdef INET
1.1       cgd       972: /*
                    973:  * Notify a udp user of an asynchronous error;
                    974:  * just wake up so that he can collect error status.
                    975:  */
1.7       mycroft   976: static void
1.119     matt      977: udp_notify(struct inpcb *inp, int errno)
1.1       cgd       978: {
                    979:        inp->inp_socket->so_error = errno;
                    980:        sorwakeup(inp->inp_socket);
                    981:        sowwakeup(inp->inp_socket);
                    982: }
                    983:
1.27      christos  984: void *
1.157     dyoung    985: udp_ctlinput(int cmd, const struct sockaddr *sa, void *v)
1.1       cgd       986: {
1.66      augustss  987:        struct ip *ip = v;
                    988:        struct udphdr *uh;
1.119     matt      989:        void (*notify)(struct inpcb *, int) = udp_notify;
1.21      mycroft   990:        int errno;
1.1       cgd       991:
1.53      itojun    992:        if (sa->sa_family != AF_INET
                    993:         || sa->sa_len != sizeof(struct sockaddr_in))
1.51      itojun    994:                return NULL;
1.20      mycroft   995:        if ((unsigned)cmd >= PRC_NCMDS)
1.27      christos  996:                return NULL;
1.20      mycroft   997:        errno = inetctlerrmap[cmd];
1.18      mycroft   998:        if (PRC_IS_REDIRECT(cmd))
1.19      mycroft   999:                notify = in_rtchange, ip = 0;
1.18      mycroft  1000:        else if (cmd == PRC_HOSTDEAD)
1.19      mycroft  1001:                ip = 0;
1.23      cgd      1002:        else if (errno == 0)
1.27      christos 1003:                return NULL;
1.19      mycroft  1004:        if (ip) {
1.158     christos 1005:                uh = (struct udphdr *)((char *)ip + (ip->ip_hl << 2));
1.157     dyoung   1006:                in_pcbnotify(&udbtable, satocsin(sa)->sin_addr, uh->uh_dport,
1.34      mycroft  1007:                    ip->ip_src, uh->uh_sport, errno, notify);
1.53      itojun   1008:
                   1009:                /* XXX mapped address case */
1.19      mycroft  1010:        } else
1.157     dyoung   1011:                in_pcbnotifyall(&udbtable, satocsin(sa)->sin_addr, errno,
1.34      mycroft  1012:                    notify);
1.27      christos 1013:        return NULL;
1.1       cgd      1014: }
                   1015:
1.7       mycroft  1016: int
1.173     plunky   1017: udp_ctloutput(int op, struct socket *so, struct sockopt *sopt)
1.130     manu     1018: {
                   1019:        int s;
                   1020:        int error = 0;
                   1021:        struct inpcb *inp;
                   1022:        int family;
1.173     plunky   1023:        int optval;
1.130     manu     1024:
                   1025:        family = so->so_proto->pr_domain->dom_family;
                   1026:
                   1027:        s = splsoftnet();
                   1028:        switch (family) {
                   1029: #ifdef INET
                   1030:        case PF_INET:
1.173     plunky   1031:                if (sopt->sopt_level != IPPROTO_UDP) {
                   1032:                        error = ip_ctloutput(op, so, sopt);
1.130     manu     1033:                        goto end;
                   1034:                }
                   1035:                break;
                   1036: #endif
                   1037: #ifdef INET6
                   1038:        case PF_INET6:
1.173     plunky   1039:                if (sopt->sopt_level != IPPROTO_UDP) {
                   1040:                        error = ip6_ctloutput(op, so, sopt);
1.130     manu     1041:                        goto end;
                   1042:                }
                   1043:                break;
                   1044: #endif
                   1045:        default:
                   1046:                error = EAFNOSUPPORT;
                   1047:                goto end;
                   1048:        }
                   1049:
                   1050:
                   1051:        switch (op) {
                   1052:        case PRCO_SETOPT:
                   1053:                inp = sotoinpcb(so);
                   1054:
1.173     plunky   1055:                switch (sopt->sopt_name) {
1.130     manu     1056:                case UDP_ENCAP:
1.173     plunky   1057:                        error = sockopt_getint(sopt, &optval);
                   1058:                        if (error)
1.153     yamt     1059:                                break;
1.131     perry    1060:
1.173     plunky   1061:                        switch(optval) {
1.130     manu     1062: #ifdef IPSEC_NAT_T
                   1063:                        case 0:
                   1064:                                inp->inp_flags &= ~INP_ESPINUDP_ALL;
                   1065:                                break;
                   1066:
                   1067:                        case UDP_ENCAP_ESPINUDP:
                   1068:                                inp->inp_flags &= ~INP_ESPINUDP_ALL;
                   1069:                                inp->inp_flags |= INP_ESPINUDP;
                   1070:                                break;
1.131     perry    1071:
1.130     manu     1072:                        case UDP_ENCAP_ESPINUDP_NON_IKE:
                   1073:                                inp->inp_flags &= ~INP_ESPINUDP_ALL;
                   1074:                                inp->inp_flags |= INP_ESPINUDP_NON_IKE;
                   1075:                                break;
                   1076: #endif
                   1077:                        default:
                   1078:                                error = EINVAL;
                   1079:                                break;
                   1080:                        }
                   1081:                        break;
1.183     christos 1082:
                   1083:                case UDP_RFC6056ALGO:
                   1084:                        error = sockopt_getint(sopt, &optval);
                   1085:                        if (error)
                   1086:                                break;
                   1087:
                   1088:                        error = rfc6056_algo_index_select(
                   1089:                            (struct inpcb_hdr *)inp, optval);
                   1090:                        break;
1.130     manu     1091:
                   1092:                default:
                   1093:                        error = ENOPROTOOPT;
                   1094:                        break;
                   1095:                }
                   1096:                break;
                   1097:
                   1098:        default:
                   1099:                error = EINVAL;
                   1100:                break;
1.131     perry    1101:        }
                   1102:
1.130     manu     1103: end:
                   1104:        splx(s);
                   1105:        return error;
                   1106: }
1.131     perry    1107:
1.130     manu     1108:
                   1109: int
1.27      christos 1110: udp_output(struct mbuf *m, ...)
                   1111: {
1.66      augustss 1112:        struct inpcb *inp;
                   1113:        struct udpiphdr *ui;
1.125     thorpej  1114:        struct route *ro;
1.66      augustss 1115:        int len = m->m_pkthdr.len;
1.31      mycroft  1116:        int error = 0;
1.27      christos 1117:        va_list ap;
                   1118:
1.98      matt     1119:        MCLAIM(m, &udp_tx_mowner);
1.27      christos 1120:        va_start(ap, m);
                   1121:        inp = va_arg(ap, struct inpcb *);
                   1122:        va_end(ap);
1.1       cgd      1123:
                   1124:        /*
                   1125:         * Calculate data length and get a mbuf
                   1126:         * for UDP and IP headers.
                   1127:         */
1.13      mycroft  1128:        M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT);
                   1129:        if (m == 0) {
                   1130:                error = ENOBUFS;
1.39      thorpej  1131:                goto release;
                   1132:        }
                   1133:
                   1134:        /*
                   1135:         * Compute the packet length of the IP header, and
                   1136:         * punt if the length looks bogus.
                   1137:         */
1.96      itojun   1138:        if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) {
1.39      thorpej  1139:                error = EMSGSIZE;
1.13      mycroft  1140:                goto release;
                   1141:        }
1.1       cgd      1142:
                   1143:        /*
                   1144:         * Fill in mbuf with extended UDP header
                   1145:         * and addresses and length put into network format.
                   1146:         */
                   1147:        ui = mtod(m, struct udpiphdr *);
                   1148:        ui->ui_pr = IPPROTO_UDP;
                   1149:        ui->ui_src = inp->inp_laddr;
                   1150:        ui->ui_dst = inp->inp_faddr;
                   1151:        ui->ui_sport = inp->inp_lport;
                   1152:        ui->ui_dport = inp->inp_fport;
1.78      thorpej  1153:        ui->ui_ulen = htons((u_int16_t)len + sizeof(struct udphdr));
1.1       cgd      1154:
1.125     thorpej  1155:        ro = &inp->inp_route;
                   1156:
1.1       cgd      1157:        /*
1.78      thorpej  1158:         * Set up checksum and output datagram.
1.1       cgd      1159:         */
                   1160:        if (udpcksum) {
1.78      thorpej  1161:                /*
                   1162:                 * XXX Cache pseudo-header checksum part for
                   1163:                 * XXX "connected" UDP sockets.
                   1164:                 */
                   1165:                ui->ui_sum = in_cksum_phdr(ui->ui_src.s_addr,
                   1166:                    ui->ui_dst.s_addr, htons((u_int16_t)len +
                   1167:                    sizeof(struct udphdr) + IPPROTO_UDP));
1.135     yamt     1168:                m->m_pkthdr.csum_flags = M_CSUM_UDPv4;
1.78      thorpej  1169:                m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
                   1170:        } else
                   1171:                ui->ui_sum = 0;
1.96      itojun   1172:        ((struct ip *)ui)->ip_len = htons(sizeof (struct udpiphdr) + len);
1.1       cgd      1173:        ((struct ip *)ui)->ip_ttl = inp->inp_ip.ip_ttl; /* XXX */
                   1174:        ((struct ip *)ui)->ip_tos = inp->inp_ip.ip_tos; /* XXX */
1.166     thorpej  1175:        UDP_STATINC(UDP_STAT_OPACKETS);
1.48      itojun   1176:
1.125     thorpej  1177:        return (ip_output(m, inp->inp_options, ro,
1.12      mycroft  1178:            inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST),
1.107     itojun   1179:            inp->inp_moptions, inp->inp_socket));
1.1       cgd      1180:
                   1181: release:
                   1182:        m_freem(m);
                   1183:        return (error);
                   1184: }
                   1185:
1.42      thorpej  1186: int    udp_sendspace = 9216;           /* really max datagram size */
                   1187: int    udp_recvspace = 40 * (1024 + sizeof(struct sockaddr_in));
1.1       cgd      1188:                                        /* 40 1K datagrams */
                   1189:
                   1190: /*ARGSUSED*/
1.7       mycroft  1191: int
1.119     matt     1192: udp_usrreq(struct socket *so, int req, struct mbuf *m, struct mbuf *nam,
1.145     christos 1193:        struct mbuf *control, struct lwp *l)
1.1       cgd      1194: {
1.66      augustss 1195:        struct inpcb *inp;
1.1       cgd      1196:        int s;
1.66      augustss 1197:        int error = 0;
1.1       cgd      1198:
                   1199:        if (req == PRU_CONTROL)
1.158     christos 1200:                return (in_control(so, (long)m, (void *)nam,
1.148     ad       1201:                    (struct ifnet *)control, l));
1.59      thorpej  1202:
1.149     tls      1203:        s = splsoftnet();
                   1204:
1.60      thorpej  1205:        if (req == PRU_PURGEIF) {
1.170     ad       1206:                mutex_enter(softnet_lock);
1.80      itojun   1207:                in_pcbpurgeif0(&udbtable, (struct ifnet *)control);
1.60      thorpej  1208:                in_purgeif((struct ifnet *)control);
                   1209:                in_pcbpurgeif(&udbtable, (struct ifnet *)control);
1.170     ad       1210:                mutex_exit(softnet_lock);
1.149     tls      1211:                splx(s);
1.59      thorpej  1212:                return (0);
                   1213:        }
1.31      mycroft  1214:
                   1215:        inp = sotoinpcb(so);
1.32      mycroft  1216: #ifdef DIAGNOSTIC
                   1217:        if (req != PRU_SEND && req != PRU_SENDOOB && control)
                   1218:                panic("udp_usrreq: unexpected control mbuf");
                   1219: #endif
1.170     ad       1220:        if (req == PRU_ATTACH) {
                   1221:                sosetlock(so);
                   1222:        } else if (inp == 0) {
1.31      mycroft  1223:                error = EINVAL;
                   1224:                goto release;
                   1225:        }
                   1226:
1.1       cgd      1227:        /*
                   1228:         * Note: need to block udp_input while changing
                   1229:         * the udp pcb queue and/or pcb addresses.
                   1230:         */
                   1231:        switch (req) {
                   1232:
                   1233:        case PRU_ATTACH:
1.31      mycroft  1234:                if (inp != 0) {
                   1235:                        error = EISCONN;
1.1       cgd      1236:                        break;
                   1237:                }
1.98      matt     1238: #ifdef MBUFTRACE
                   1239:                so->so_mowner = &udp_mowner;
                   1240:                so->so_rcv.sb_mowner = &udp_rx_mowner;
                   1241:                so->so_snd.sb_mowner = &udp_tx_mowner;
                   1242: #endif
1.31      mycroft  1243:                if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
                   1244:                        error = soreserve(so, udp_sendspace, udp_recvspace);
                   1245:                        if (error)
                   1246:                                break;
                   1247:                }
1.18      mycroft  1248:                error = in_pcballoc(so, &udbtable);
1.1       cgd      1249:                if (error)
                   1250:                        break;
1.31      mycroft  1251:                inp = sotoinpcb(so);
                   1252:                inp->inp_ip.ip_ttl = ip_defttl;
1.1       cgd      1253:                break;
                   1254:
                   1255:        case PRU_DETACH:
1.31      mycroft  1256:                in_pcbdetach(inp);
1.1       cgd      1257:                break;
                   1258:
                   1259:        case PRU_BIND:
1.148     ad       1260:                error = in_pcbbind(inp, nam, l);
1.1       cgd      1261:                break;
                   1262:
                   1263:        case PRU_LISTEN:
                   1264:                error = EOPNOTSUPP;
                   1265:                break;
                   1266:
                   1267:        case PRU_CONNECT:
1.148     ad       1268:                error = in_pcbconnect(inp, nam, l);
1.31      mycroft  1269:                if (error)
1.1       cgd      1270:                        break;
1.31      mycroft  1271:                soisconnected(so);
1.1       cgd      1272:                break;
                   1273:
                   1274:        case PRU_CONNECT2:
                   1275:                error = EOPNOTSUPP;
                   1276:                break;
                   1277:
                   1278:        case PRU_DISCONNECT:
1.31      mycroft  1279:                /*soisdisconnected(so);*/
                   1280:                so->so_state &= ~SS_ISCONNECTED;        /* XXX */
1.1       cgd      1281:                in_pcbdisconnect(inp);
1.34      mycroft  1282:                inp->inp_laddr = zeroin_addr;           /* XXX */
1.35      mycroft  1283:                in_pcbstate(inp, INP_BOUND);            /* XXX */
1.1       cgd      1284:                break;
                   1285:
                   1286:        case PRU_SHUTDOWN:
                   1287:                socantsendmore(so);
                   1288:                break;
                   1289:
1.31      mycroft  1290:        case PRU_RCVD:
                   1291:                error = EOPNOTSUPP;
1.1       cgd      1292:                break;
                   1293:
1.31      mycroft  1294:        case PRU_SEND:
1.32      mycroft  1295:                if (control && control->m_len) {
                   1296:                        m_freem(control);
                   1297:                        m_freem(m);
                   1298:                        error = EINVAL;
                   1299:                        break;
                   1300:                }
1.31      mycroft  1301:        {
1.35      mycroft  1302:                struct in_addr laddr;                   /* XXX */
1.1       cgd      1303:
1.181     mrg      1304:                memset(&laddr, 0, sizeof laddr);
1.31      mycroft  1305:                if (nam) {
1.35      mycroft  1306:                        laddr = inp->inp_laddr;         /* XXX */
1.31      mycroft  1307:                        if ((so->so_state & SS_ISCONNECTED) != 0) {
                   1308:                                error = EISCONN;
1.32      mycroft  1309:                                goto die;
1.31      mycroft  1310:                        }
1.148     ad       1311:                        error = in_pcbconnect(inp, nam, l);
1.100     matt     1312:                        if (error)
                   1313:                                goto die;
1.31      mycroft  1314:                } else {
                   1315:                        if ((so->so_state & SS_ISCONNECTED) == 0) {
                   1316:                                error = ENOTCONN;
1.32      mycroft  1317:                                goto die;
1.31      mycroft  1318:                        }
                   1319:                }
1.33      mycroft  1320:                error = udp_output(m, inp);
1.100     matt     1321:                m = NULL;
1.31      mycroft  1322:                if (nam) {
                   1323:                        in_pcbdisconnect(inp);
1.35      mycroft  1324:                        inp->inp_laddr = laddr;         /* XXX */
                   1325:                        in_pcbstate(inp, INP_BOUND);    /* XXX */
1.31      mycroft  1326:                }
1.100     matt     1327:          die:
                   1328:                if (m)
                   1329:                        m_freem(m);
1.31      mycroft  1330:        }
1.1       cgd      1331:                break;
                   1332:
                   1333:        case PRU_SENSE:
                   1334:                /*
                   1335:                 * stat: don't bother with a blocksize.
                   1336:                 */
1.31      mycroft  1337:                splx(s);
1.1       cgd      1338:                return (0);
                   1339:
1.31      mycroft  1340:        case PRU_RCVOOB:
                   1341:                error =  EOPNOTSUPP;
                   1342:                break;
                   1343:
1.1       cgd      1344:        case PRU_SENDOOB:
1.32      mycroft  1345:                m_freem(control);
1.31      mycroft  1346:                m_freem(m);
1.1       cgd      1347:                error =  EOPNOTSUPP;
                   1348:                break;
                   1349:
1.31      mycroft  1350:        case PRU_SOCKADDR:
                   1351:                in_setsockaddr(inp, nam);
                   1352:                break;
                   1353:
                   1354:        case PRU_PEERADDR:
                   1355:                in_setpeeraddr(inp, nam);
                   1356:                break;
1.1       cgd      1357:
                   1358:        default:
                   1359:                panic("udp_usrreq");
                   1360:        }
                   1361:
                   1362: release:
1.31      mycroft  1363:        splx(s);
1.1       cgd      1364:        return (error);
1.13      mycroft  1365: }
                   1366:
1.166     thorpej  1367: static int
                   1368: sysctl_net_inet_udp_stats(SYSCTLFN_ARGS)
                   1369: {
                   1370:
1.172     thorpej  1371:        return (NETSTAT_SYSCTL(udpstat_percpu, UDP_NSTATS));
1.166     thorpej  1372: }
                   1373:
1.13      mycroft  1374: /*
                   1375:  * Sysctl for udp variables.
                   1376:  */
1.179     pooka    1377: static void
                   1378: sysctl_net_inet_udp_setup(struct sysctllog **clog)
1.13      mycroft  1379: {
1.183     christos 1380:        const struct sysctlnode *rfc6056_node;
                   1381:
1.116     atatat   1382:        sysctl_createv(clog, 0, NULL, NULL,
                   1383:                       CTLFLAG_PERMANENT,
1.114     atatat   1384:                       CTLTYPE_NODE, "net", NULL,
                   1385:                       NULL, 0, NULL, 0,
                   1386:                       CTL_NET, CTL_EOL);
1.116     atatat   1387:        sysctl_createv(clog, 0, NULL, NULL,
                   1388:                       CTLFLAG_PERMANENT,
1.114     atatat   1389:                       CTLTYPE_NODE, "inet", NULL,
                   1390:                       NULL, 0, NULL, 0,
                   1391:                       CTL_NET, PF_INET, CTL_EOL);
1.116     atatat   1392:        sysctl_createv(clog, 0, NULL, NULL,
                   1393:                       CTLFLAG_PERMANENT,
1.122     atatat   1394:                       CTLTYPE_NODE, "udp",
                   1395:                       SYSCTL_DESCR("UDPv4 related settings"),
1.114     atatat   1396:                       NULL, 0, NULL, 0,
                   1397:                       CTL_NET, PF_INET, IPPROTO_UDP, CTL_EOL);
                   1398:
1.116     atatat   1399:        sysctl_createv(clog, 0, NULL, NULL,
                   1400:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.122     atatat   1401:                       CTLTYPE_INT, "checksum",
1.123     heas     1402:                       SYSCTL_DESCR("Compute UDP checksums"),
1.114     atatat   1403:                       NULL, 0, &udpcksum, 0,
                   1404:                       CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_CHECKSUM,
                   1405:                       CTL_EOL);
1.116     atatat   1406:        sysctl_createv(clog, 0, NULL, NULL,
                   1407:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.122     atatat   1408:                       CTLTYPE_INT, "sendspace",
                   1409:                       SYSCTL_DESCR("Default UDP send buffer size"),
1.114     atatat   1410:                       NULL, 0, &udp_sendspace, 0,
                   1411:                       CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_SENDSPACE,
                   1412:                       CTL_EOL);
1.116     atatat   1413:        sysctl_createv(clog, 0, NULL, NULL,
                   1414:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.122     atatat   1415:                       CTLTYPE_INT, "recvspace",
                   1416:                       SYSCTL_DESCR("Default UDP receive buffer size"),
1.114     atatat   1417:                       NULL, 0, &udp_recvspace, 0,
                   1418:                       CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_RECVSPACE,
                   1419:                       CTL_EOL);
1.125     thorpej  1420:        sysctl_createv(clog, 0, NULL, NULL,
                   1421:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1422:                       CTLTYPE_INT, "do_loopback_cksum",
                   1423:                       SYSCTL_DESCR("Perform UDP checksum on loopback"),
                   1424:                       NULL, 0, &udp_do_loopback_cksum, 0,
                   1425:                       CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_LOOPBACKCKSUM,
                   1426:                       CTL_EOL);
1.132     atatat   1427:        sysctl_createv(clog, 0, NULL, NULL,
                   1428:                       CTLFLAG_PERMANENT,
1.134     atatat   1429:                       CTLTYPE_STRUCT, "pcblist",
1.132     atatat   1430:                       SYSCTL_DESCR("UDP protocol control block list"),
                   1431:                       sysctl_inpcblist, 0, &udbtable, 0,
                   1432:                       CTL_NET, PF_INET, IPPROTO_UDP, CTL_CREATE,
                   1433:                       CTL_EOL);
1.139     elad     1434:        sysctl_createv(clog, 0, NULL, NULL,
                   1435:                       CTLFLAG_PERMANENT,
                   1436:                       CTLTYPE_STRUCT, "stats",
                   1437:                       SYSCTL_DESCR("UDP statistics"),
1.166     thorpej  1438:                       sysctl_net_inet_udp_stats, 0, NULL, 0,
1.139     elad     1439:                       CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_STATS,
                   1440:                       CTL_EOL);
1.183     christos 1441:        /* RFC6056 subtree */
                   1442:        sysctl_createv(clog, 0, NULL, &rfc6056_node,
                   1443:                       CTLFLAG_PERMANENT,
                   1444:                       CTLTYPE_NODE, "rfc6056",
                   1445:                       SYSCTL_DESCR("RFC 6056"),
                   1446:                       NULL, 0, NULL, 0,
                   1447:                       CTL_NET, PF_INET, IPPROTO_UDP, CTL_CREATE, CTL_EOL);
                   1448:        sysctl_createv(clog, 0, &rfc6056_node, NULL,
                   1449:                       CTLFLAG_PERMANENT,
                   1450:                       CTLTYPE_STRING, "available",
                   1451:                       SYSCTL_DESCR("RFC 6056 available algorithms"),
                   1452:                       sysctl_rfc6056_available, 0, NULL, RFC6056_MAXLEN,
                   1453:                       CTL_CREATE, CTL_EOL);
                   1454:        sysctl_createv(clog, 0, &rfc6056_node, NULL,
                   1455:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1456:                       CTLTYPE_STRING, "selected",
                   1457:                       SYSCTL_DESCR("RFC 6056 selected algorithm"),
                   1458:                       sysctl_rfc6056_selected, 0, NULL, RFC6056_MAXLEN,
                   1459:                       CTL_CREATE, CTL_EOL);
1.1       cgd      1460: }
1.72      itojun   1461: #endif
1.130     manu     1462:
1.166     thorpej  1463: void
                   1464: udp_statinc(u_int stat)
                   1465: {
                   1466:
                   1467:        KASSERT(stat < UDP_NSTATS);
                   1468:        UDP_STATINC(stat);
                   1469: }
                   1470:
1.130     manu     1471: #if (defined INET && defined IPSEC_NAT_T)
                   1472: /*
                   1473:  * Returns:
                   1474:  * 1 if the packet was processed
                   1475:  * 0 if normal UDP processing should take place
1.144     manu     1476:  * -1 if an error occurent and m was freed
1.130     manu     1477:  */
                   1478: static int
1.154     yamt     1479: udp4_espinudp(struct mbuf **mp, int off, struct sockaddr *src,
1.151     christos 1480:     struct socket *so)
1.130     manu     1481: {
                   1482:        size_t len;
1.158     christos 1483:        void *data;
1.130     manu     1484:        struct inpcb *inp;
                   1485:        size_t skip = 0;
                   1486:        size_t minlen;
                   1487:        size_t iphdrlen;
                   1488:        struct ip *ip;
                   1489:        struct mbuf *n;
1.136     manu     1490:        struct m_tag *tag;
                   1491:        struct udphdr *udphdr;
                   1492:        u_int16_t sport, dport;
1.144     manu     1493:        struct mbuf *m = *mp;
1.130     manu     1494:
1.131     perry    1495:        /*
1.130     manu     1496:         * Collapse the mbuf chain if the first mbuf is too short
                   1497:         * The longest case is: UDP + non ESP marker + ESP
                   1498:         */
                   1499:        minlen = off + sizeof(u_int64_t) + sizeof(struct esp);
                   1500:        if (minlen > m->m_pkthdr.len)
                   1501:                minlen = m->m_pkthdr.len;
                   1502:
                   1503:        if (m->m_len < minlen) {
1.144     manu     1504:                if ((*mp = m_pullup(m, minlen)) == NULL) {
1.130     manu     1505:                        printf("udp4_espinudp: m_pullup failed\n");
1.144     manu     1506:                        return -1;
1.130     manu     1507:                }
1.144     manu     1508:                m = *mp;
1.130     manu     1509:        }
                   1510:
1.131     perry    1511:        len = m->m_len - off;
1.158     christos 1512:        data = mtod(m, char *) + off;
1.130     manu     1513:        inp = sotoinpcb(so);
                   1514:
                   1515:        /* Ignore keepalive packets */
1.158     christos 1516:        if ((len == 1) && (*(unsigned char *)data == 0xff)) {
1.130     manu     1517:                return 1;
                   1518:        }
                   1519:
1.131     perry    1520:        /*
                   1521:         * Check that the payload is long enough to hold
1.130     manu     1522:         * an ESP header and compute the length of encapsulation
1.131     perry    1523:         * header to remove
1.130     manu     1524:         */
                   1525:        if (inp->inp_flags & INP_ESPINUDP) {
                   1526:                u_int32_t *st = (u_int32_t *)data;
                   1527:
                   1528:                if ((len <= sizeof(struct esp)) || (*st == 0))
                   1529:                        return 0; /* Normal UDP processing */
                   1530:
                   1531:                skip = sizeof(struct udphdr);
                   1532:        }
                   1533:
                   1534:        if (inp->inp_flags & INP_ESPINUDP_NON_IKE) {
1.142     kleink   1535:                u_int32_t *st = (u_int32_t *)data;
1.130     manu     1536:
                   1537:                if ((len <= sizeof(u_int64_t) + sizeof(struct esp))
1.142     kleink   1538:                    || ((st[0] | st[1]) != 0))
1.130     manu     1539:                        return 0; /* Normal UDP processing */
1.131     perry    1540:
1.130     manu     1541:                skip = sizeof(struct udphdr) + sizeof(u_int64_t);
                   1542:        }
                   1543:
                   1544:        /*
1.136     manu     1545:         * Get the UDP ports. They are handled in network
                   1546:         * order everywhere in IPSEC_NAT_T code.
                   1547:         */
1.158     christos 1548:        udphdr = (struct udphdr *)((char *)data - skip);
1.136     manu     1549:        sport = udphdr->uh_sport;
                   1550:        dport = udphdr->uh_dport;
                   1551:
                   1552:        /*
1.130     manu     1553:         * Remove the UDP header (and possibly the non ESP marker)
                   1554:         * IP header lendth is iphdrlen
1.131     perry    1555:         * Before:
1.130     manu     1556:         *   <--- off --->
                   1557:         *   +----+------+-----+
                   1558:         *   | IP |  UDP | ESP |
                   1559:         *   +----+------+-----+
                   1560:         *        <-skip->
                   1561:         * After:
                   1562:         *          +----+-----+
                   1563:         *          | IP | ESP |
                   1564:         *          +----+-----+
                   1565:         *   <-skip->
                   1566:         */
                   1567:        iphdrlen = off - sizeof(struct udphdr);
1.158     christos 1568:        memmove(mtod(m, char *) + skip, mtod(m, void *), iphdrlen);
1.130     manu     1569:        m_adj(m, skip);
                   1570:
                   1571:        ip = mtod(m, struct ip *);
                   1572:        ip->ip_len = htons(ntohs(ip->ip_len) - skip);
                   1573:        ip->ip_p = IPPROTO_ESP;
                   1574:
                   1575:        /*
1.131     perry    1576:         * Copy the mbuf to avoid multiple free, as both
                   1577:         * esp4_input (which we call) and udp_input (which
1.130     manu     1578:         * called us) free the mbuf.
                   1579:         */
                   1580:        if ((n = m_dup(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
                   1581:                printf("udp4_espinudp: m_dup failed\n");
                   1582:                return 0;
                   1583:        }
                   1584:
1.136     manu     1585:        /*
                   1586:         * Add a PACKET_TAG_IPSEC_NAT_T_PORT tag to remember
                   1587:         * the source UDP port. This is required if we want
                   1588:         * to select the right SPD for multiple hosts behind
                   1589:         * same NAT
                   1590:         */
1.137     manu     1591:        if ((tag = m_tag_get(PACKET_TAG_IPSEC_NAT_T_PORTS,
                   1592:            sizeof(sport) + sizeof(dport), M_DONTWAIT)) == NULL) {
                   1593:                printf("udp4_espinudp: m_tag_get failed\n");
1.138     manu     1594:                m_freem(n);
1.137     manu     1595:                return 0;
                   1596:        }
1.136     manu     1597:        ((u_int16_t *)(tag + 1))[0] = sport;
                   1598:        ((u_int16_t *)(tag + 1))[1] = dport;
                   1599:        m_tag_prepend(n, tag);
                   1600:
1.147     christos 1601: #ifdef FAST_IPSEC
1.160     degroote 1602:        ipsec4_common_input(n, iphdrlen, IPPROTO_ESP);
1.147     christos 1603: #else
1.130     manu     1604:        esp4_input(n, iphdrlen);
1.147     christos 1605: #endif
1.130     manu     1606:
1.185     liamjfoy 1607:        /* We handled it, it shouldn't be handled by UDP */
1.130     manu     1608:        return 1;
                   1609: }
                   1610: #endif

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