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Annotation of src/sys/netinet/udp_usrreq.c, Revision 1.199

1.199   ! christos    1: /*     $NetBSD: udp_usrreq.c,v 1.198 2014/05/22 22:56:53 rmind Exp $   */
1.48      itojun      2:
                      3: /*
                      4:  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
                      5:  * All rights reserved.
1.94      itojun      6:  *
1.48      itojun      7:  * Redistribution and use in source and binary forms, with or without
                      8:  * modification, are permitted provided that the following conditions
                      9:  * are met:
                     10:  * 1. Redistributions of source code must retain the above copyright
                     11:  *    notice, this list of conditions and the following disclaimer.
                     12:  * 2. Redistributions in binary form must reproduce the above copyright
                     13:  *    notice, this list of conditions and the following disclaimer in the
                     14:  *    documentation and/or other materials provided with the distribution.
                     15:  * 3. Neither the name of the project nor the names of its contributors
                     16:  *    may be used to endorse or promote products derived from this software
                     17:  *    without specific prior written permission.
1.94      itojun     18:  *
1.48      itojun     19:  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
                     20:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     21:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     22:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
                     23:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     24:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     25:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     26:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     27:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     28:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     29:  * SUCH DAMAGE.
                     30:  */
1.14      cgd        31:
1.1       cgd        32: /*
1.44      thorpej    33:  * Copyright (c) 1982, 1986, 1988, 1990, 1993, 1995
1.13      mycroft    34:  *     The Regents of the University of California.  All rights reserved.
1.1       cgd        35:  *
                     36:  * Redistribution and use in source and binary forms, with or without
                     37:  * modification, are permitted provided that the following conditions
                     38:  * are met:
                     39:  * 1. Redistributions of source code must retain the above copyright
                     40:  *    notice, this list of conditions and the following disclaimer.
                     41:  * 2. Redistributions in binary form must reproduce the above copyright
                     42:  *    notice, this list of conditions and the following disclaimer in the
                     43:  *    documentation and/or other materials provided with the distribution.
1.104     agc        44:  * 3. Neither the name of the University nor the names of its contributors
1.1       cgd        45:  *    may be used to endorse or promote products derived from this software
                     46:  *    without specific prior written permission.
                     47:  *
                     48:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     49:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     50:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     51:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     52:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     53:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     54:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     55:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     56:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     57:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     58:  * SUCH DAMAGE.
                     59:  *
1.44      thorpej    60:  *     @(#)udp_usrreq.c        8.6 (Berkeley) 5/23/95
1.1       cgd        61:  */
1.91      lukem      62:
1.198     rmind      63: /*
                     64:  * UDP protocol implementation.
                     65:  * Per RFC 768, August, 1980.
                     66:  */
                     67:
1.91      lukem      68: #include <sys/cdefs.h>
1.199   ! christos   69: __KERNEL_RCSID(0, "$NetBSD: udp_usrreq.c,v 1.198 2014/05/22 22:56:53 rmind Exp $");
1.50      thorpej    70:
1.77      soda       71: #include "opt_inet.h"
1.174     christos   72: #include "opt_compat_netbsd.h"
1.50      thorpej    73: #include "opt_ipsec.h"
1.78      thorpej    74: #include "opt_inet_csum.h"
1.64      ws         75: #include "opt_ipkdb.h"
1.101     martin     76: #include "opt_mbuftrace.h"
1.1       cgd        77:
1.5       mycroft    78: #include <sys/param.h>
                     79: #include <sys/mbuf.h>
1.192     pooka      80: #include <sys/once.h>
1.5       mycroft    81: #include <sys/protosw.h>
                     82: #include <sys/socket.h>
                     83: #include <sys/socketvar.h>
1.27      christos   84: #include <sys/systm.h>
                     85: #include <sys/proc.h>
1.53      itojun     86: #include <sys/domain.h>
1.27      christos   87: #include <sys/sysctl.h>
1.1       cgd        88:
1.5       mycroft    89: #include <net/if.h>
                     90: #include <net/route.h>
1.1       cgd        91:
1.5       mycroft    92: #include <netinet/in.h>
                     93: #include <netinet/in_systm.h>
1.15      cgd        94: #include <netinet/in_var.h>
1.5       mycroft    95: #include <netinet/ip.h>
                     96: #include <netinet/in_pcb.h>
                     97: #include <netinet/ip_var.h>
                     98: #include <netinet/ip_icmp.h>
                     99: #include <netinet/udp.h>
                    100: #include <netinet/udp_var.h>
1.166     thorpej   101: #include <netinet/udp_private.h>
1.1       cgd       102:
1.53      itojun    103: #ifdef INET6
                    104: #include <netinet/ip6.h>
                    105: #include <netinet/icmp6.h>
                    106: #include <netinet6/ip6_var.h>
1.167     thorpej   107: #include <netinet6/ip6_private.h>
1.53      itojun    108: #include <netinet6/in6_pcb.h>
                    109: #include <netinet6/udp6_var.h>
1.168     thorpej   110: #include <netinet6/udp6_private.h>
1.53      itojun    111: #endif
                    112:
                    113: #ifndef INET6
                    114: /* always need ip6.h for IP6_EXTHDR_GET */
                    115: #include <netinet/ip6.h>
                    116: #endif
                    117:
1.190     christos  118: #ifdef IPSEC
1.105     jonathan  119: #include <netipsec/ipsec.h>
1.169     thorpej   120: #include <netipsec/ipsec_var.h>
                    121: #include <netipsec/ipsec_private.h>
1.147     christos  122: #include <netipsec/esp.h>
1.105     jonathan  123: #ifdef INET6
                    124: #include <netipsec/ipsec6.h>
                    125: #endif
1.190     christos  126: #endif /* IPSEC */
1.105     jonathan  127:
1.174     christos  128: #ifdef COMPAT_50
                    129: #include <compat/sys/socket.h>
                    130: #endif
                    131:
1.64      ws        132: #ifdef IPKDB
                    133: #include <ipkdb/ipkdb.h>
                    134: #endif
                    135:
1.8       mycroft   136: int    udpcksum = 1;
1.141     yamt      137: int    udp_do_loopback_cksum = 0;
1.93      matt      138:
                    139: struct inpcbtable udbtable;
1.164     thorpej   140:
1.166     thorpej   141: percpu_t *udpstat_percpu;
1.8       mycroft   142:
1.72      itojun    143: #ifdef INET
1.190     christos  144: #ifdef IPSEC
1.144     manu      145: static int udp4_espinudp (struct mbuf **, int, struct sockaddr *,
1.130     manu      146:        struct socket *);
1.189     christos  147: #endif
1.119     matt      148: static void udp4_sendup (struct mbuf *, int, struct sockaddr *,
                    149:        struct socket *);
                    150: static int udp4_realinput (struct sockaddr_in *, struct sockaddr_in *,
1.144     manu      151:        struct mbuf **, int);
1.129     yamt      152: static int udp4_input_checksum(struct mbuf *, const struct udphdr *, int, int);
1.72      itojun    153: #endif
                    154: #ifdef INET
1.119     matt      155: static void udp_notify (struct inpcb *, int);
1.72      itojun    156: #endif
1.7       mycroft   157:
1.26      mycroft   158: #ifndef UDBHASHSIZE
                    159: #define        UDBHASHSIZE     128
                    160: #endif
                    161: int    udbhashsize = UDBHASHSIZE;
                    162:
1.196     rmind     163: /*
                    164:  * For send - really max datagram size; for receive - 40 1K datagrams.
                    165:  */
                    166: static int     udp_sendspace = 9216;
                    167: static int     udp_recvspace = 40 * (1024 + sizeof(struct sockaddr_in));
                    168:
1.98      matt      169: #ifdef MBUFTRACE
1.150     dogcow    170: struct mowner udp_mowner = MOWNER_INIT("udp", "");
                    171: struct mowner udp_rx_mowner = MOWNER_INIT("udp", "rx");
                    172: struct mowner udp_tx_mowner = MOWNER_INIT("udp", "tx");
1.98      matt      173: #endif
                    174:
1.78      thorpej   175: #ifdef UDP_CSUM_COUNTERS
                    176: #include <sys/device.h>
                    177:
1.140     yamt      178: #if defined(INET)
1.78      thorpej   179: struct evcnt udp_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    180:     NULL, "udp", "hwcsum bad");
                    181: struct evcnt udp_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    182:     NULL, "udp", "hwcsum ok");
                    183: struct evcnt udp_hwcsum_data = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    184:     NULL, "udp", "hwcsum data");
                    185: struct evcnt udp_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    186:     NULL, "udp", "swcsum");
                    187:
1.120     matt      188: EVCNT_ATTACH_STATIC(udp_hwcsum_bad);
                    189: EVCNT_ATTACH_STATIC(udp_hwcsum_ok);
                    190: EVCNT_ATTACH_STATIC(udp_hwcsum_data);
                    191: EVCNT_ATTACH_STATIC(udp_swcsum);
1.140     yamt      192: #endif /* defined(INET) */
                    193:
                    194: #define        UDP_CSUM_COUNTER_INCR(ev)       (ev)->ev_count++
1.78      thorpej   195: #else
                    196: #define        UDP_CSUM_COUNTER_INCR(ev)       /* nothing */
                    197: #endif /* UDP_CSUM_COUNTERS */
                    198:
1.179     pooka     199: static void sysctl_net_inet_udp_setup(struct sysctllog **);
                    200:
1.192     pooka     201: static int
                    202: do_udpinit(void)
1.1       cgd       203: {
1.18      mycroft   204:
1.35      mycroft   205:        in_pcbinit(&udbtable, udbhashsize, udbhashsize);
1.193     pooka     206:        udpstat_percpu = percpu_alloc(sizeof(uint64_t) * UDP_NSTATS);
1.78      thorpej   207:
1.98      matt      208:        MOWNER_ATTACH(&udp_tx_mowner);
                    209:        MOWNER_ATTACH(&udp_rx_mowner);
                    210:        MOWNER_ATTACH(&udp_mowner);
1.166     thorpej   211:
1.192     pooka     212:        return 0;
                    213: }
                    214:
                    215: void
                    216: udp_init_common(void)
                    217: {
                    218:        static ONCE_DECL(doudpinit);
                    219:
                    220:        RUN_ONCE(&doudpinit, do_udpinit);
                    221: }
                    222:
                    223: void
                    224: udp_init(void)
                    225: {
                    226:
                    227:        sysctl_net_inet_udp_setup(NULL);
                    228:
                    229:        udp_init_common();
1.1       cgd       230: }
                    231:
1.129     yamt      232: /*
                    233:  * Checksum extended UDP header and data.
                    234:  */
                    235:
                    236: int
                    237: udp_input_checksum(int af, struct mbuf *m, const struct udphdr *uh,
                    238:     int iphlen, int len)
                    239: {
                    240:
                    241:        switch (af) {
1.72      itojun    242: #ifdef INET
1.129     yamt      243:        case AF_INET:
                    244:                return udp4_input_checksum(m, uh, iphlen, len);
                    245: #endif
                    246: #ifdef INET6
                    247:        case AF_INET6:
                    248:                return udp6_input_checksum(m, uh, iphlen, len);
                    249: #endif
                    250:        }
                    251: #ifdef DIAGNOSTIC
                    252:        panic("udp_input_checksum: unknown af %d", af);
                    253: #endif
                    254:        /* NOTREACHED */
                    255:        return -1;
                    256: }
                    257:
                    258: #ifdef INET
                    259:
                    260: /*
                    261:  * Checksum extended UDP header and data.
                    262:  */
                    263:
                    264: static int
                    265: udp4_input_checksum(struct mbuf *m, const struct udphdr *uh,
                    266:     int iphlen, int len)
                    267: {
                    268:
                    269:        /*
                    270:         * XXX it's better to record and check if this mbuf is
                    271:         * already checked.
                    272:         */
                    273:
                    274:        if (uh->uh_sum == 0)
                    275:                return 0;
                    276:
                    277:        switch (m->m_pkthdr.csum_flags &
                    278:            ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_UDPv4) |
                    279:            M_CSUM_TCP_UDP_BAD | M_CSUM_DATA)) {
                    280:        case M_CSUM_UDPv4|M_CSUM_TCP_UDP_BAD:
                    281:                UDP_CSUM_COUNTER_INCR(&udp_hwcsum_bad);
                    282:                goto badcsum;
                    283:
                    284:        case M_CSUM_UDPv4|M_CSUM_DATA: {
                    285:                u_int32_t hw_csum = m->m_pkthdr.csum_data;
                    286:
                    287:                UDP_CSUM_COUNTER_INCR(&udp_hwcsum_data);
                    288:                if (m->m_pkthdr.csum_flags & M_CSUM_NO_PSEUDOHDR) {
                    289:                        const struct ip *ip =
                    290:                            mtod(m, const struct ip *);
                    291:
                    292:                        hw_csum = in_cksum_phdr(ip->ip_src.s_addr,
                    293:                            ip->ip_dst.s_addr,
                    294:                            htons(hw_csum + len + IPPROTO_UDP));
                    295:                }
                    296:                if ((hw_csum ^ 0xffff) != 0)
                    297:                        goto badcsum;
                    298:                break;
                    299:        }
                    300:
                    301:        case M_CSUM_UDPv4:
                    302:                /* Checksum was okay. */
                    303:                UDP_CSUM_COUNTER_INCR(&udp_hwcsum_ok);
                    304:                break;
                    305:
                    306:        default:
                    307:                /*
                    308:                 * Need to compute it ourselves.  Maybe skip checksum
                    309:                 * on loopback interfaces.
                    310:                 */
                    311:                if (__predict_true(!(m->m_pkthdr.rcvif->if_flags &
                    312:                                     IFF_LOOPBACK) ||
                    313:                                   udp_do_loopback_cksum)) {
                    314:                        UDP_CSUM_COUNTER_INCR(&udp_swcsum);
                    315:                        if (in4_cksum(m, IPPROTO_UDP, iphlen, len) != 0)
                    316:                                goto badcsum;
                    317:                }
                    318:                break;
                    319:        }
                    320:
                    321:        return 0;
                    322:
                    323: badcsum:
1.166     thorpej   324:        UDP_STATINC(UDP_STAT_BADSUM);
1.129     yamt      325:        return -1;
                    326: }
                    327:
1.7       mycroft   328: void
1.27      christos  329: udp_input(struct mbuf *m, ...)
1.1       cgd       330: {
1.53      itojun    331:        va_list ap;
                    332:        struct sockaddr_in src, dst;
                    333:        struct ip *ip;
                    334:        struct udphdr *uh;
1.97      simonb    335:        int iphlen;
1.53      itojun    336:        int len;
                    337:        int n;
1.96      itojun    338:        u_int16_t ip_len;
1.53      itojun    339:
                    340:        va_start(ap, m);
                    341:        iphlen = va_arg(ap, int);
1.97      simonb    342:        (void)va_arg(ap, int);          /* ignore value, advance ap */
1.53      itojun    343:        va_end(ap);
                    344:
1.98      matt      345:        MCLAIM(m, &udp_rx_mowner);
1.166     thorpej   346:        UDP_STATINC(UDP_STAT_IPACKETS);
1.53      itojun    347:
                    348:        /*
                    349:         * Get IP and UDP header together in first mbuf.
                    350:         */
                    351:        ip = mtod(m, struct ip *);
                    352:        IP6_EXTHDR_GET(uh, struct udphdr *, m, iphlen, sizeof(struct udphdr));
                    353:        if (uh == NULL) {
1.166     thorpej   354:                UDP_STATINC(UDP_STAT_HDROPS);
1.53      itojun    355:                return;
                    356:        }
1.95      thorpej   357:        KASSERT(UDP_HDR_ALIGNED_P(uh));
1.53      itojun    358:
1.57      itojun    359:        /* destination port of 0 is illegal, based on RFC768. */
                    360:        if (uh->uh_dport == 0)
                    361:                goto bad;
                    362:
1.53      itojun    363:        /*
                    364:         * Make mbuf data length reflect UDP length.
                    365:         * If not enough data to reflect UDP length, drop.
                    366:         */
1.96      itojun    367:        ip_len = ntohs(ip->ip_len);
1.53      itojun    368:        len = ntohs((u_int16_t)uh->uh_ulen);
1.96      itojun    369:        if (ip_len != iphlen + len) {
                    370:                if (ip_len < iphlen + len || len < sizeof(struct udphdr)) {
1.166     thorpej   371:                        UDP_STATINC(UDP_STAT_BADLEN);
1.53      itojun    372:                        goto bad;
                    373:                }
1.96      itojun    374:                m_adj(m, iphlen + len - ip_len);
1.53      itojun    375:        }
                    376:
                    377:        /*
                    378:         * Checksum extended UDP header and data.
                    379:         */
1.129     yamt      380:        if (udp4_input_checksum(m, uh, iphlen, len))
                    381:                goto badcsum;
1.53      itojun    382:
                    383:        /* construct source and dst sockaddrs. */
1.159     dyoung    384:        sockaddr_in_init(&src, &ip->ip_src, uh->uh_sport);
                    385:        sockaddr_in_init(&dst, &ip->ip_dst, uh->uh_dport);
1.53      itojun    386:
1.144     manu      387:        if ((n = udp4_realinput(&src, &dst, &m, iphlen)) == -1) {
1.166     thorpej   388:                UDP_STATINC(UDP_STAT_HDROPS);
1.144     manu      389:                return;
                    390:        }
1.188     christos  391:        if (m == NULL) {
                    392:                /*
                    393:                 * packet has been processed by ESP stuff -
                    394:                 * e.g. dropped NAT-T-keep-alive-packet ...
                    395:                 */
                    396:                return;
                    397:        }
                    398:        ip = mtod(m, struct ip *);
1.53      itojun    399: #ifdef INET6
                    400:        if (IN_MULTICAST(ip->ip_dst.s_addr) || n == 0) {
                    401:                struct sockaddr_in6 src6, dst6;
                    402:
1.175     cegger    403:                memset(&src6, 0, sizeof(src6));
1.53      itojun    404:                src6.sin6_family = AF_INET6;
                    405:                src6.sin6_len = sizeof(struct sockaddr_in6);
                    406:                src6.sin6_addr.s6_addr[10] = src6.sin6_addr.s6_addr[11] = 0xff;
1.177     tsutsui   407:                memcpy(&src6.sin6_addr.s6_addr[12], &ip->ip_src,
1.53      itojun    408:                        sizeof(ip->ip_src));
                    409:                src6.sin6_port = uh->uh_sport;
1.175     cegger    410:                memset(&dst6, 0, sizeof(dst6));
1.53      itojun    411:                dst6.sin6_family = AF_INET6;
                    412:                dst6.sin6_len = sizeof(struct sockaddr_in6);
                    413:                dst6.sin6_addr.s6_addr[10] = dst6.sin6_addr.s6_addr[11] = 0xff;
1.177     tsutsui   414:                memcpy(&dst6.sin6_addr.s6_addr[12], &ip->ip_dst,
1.53      itojun    415:                        sizeof(ip->ip_dst));
                    416:                dst6.sin6_port = uh->uh_dport;
                    417:
                    418:                n += udp6_realinput(AF_INET, &src6, &dst6, m, iphlen);
                    419:        }
                    420: #endif
                    421:
                    422:        if (n == 0) {
                    423:                if (m->m_flags & (M_BCAST | M_MCAST)) {
1.166     thorpej   424:                        UDP_STATINC(UDP_STAT_NOPORTBCAST);
1.53      itojun    425:                        goto bad;
                    426:                }
1.166     thorpej   427:                UDP_STATINC(UDP_STAT_NOPORT);
1.64      ws        428: #ifdef IPKDB
1.53      itojun    429:                if (checkipkdb(&ip->ip_src, uh->uh_sport, uh->uh_dport,
                    430:                                m, iphlen + sizeof(struct udphdr),
                    431:                                m->m_pkthdr.len - iphlen - sizeof(struct udphdr))) {
                    432:                        /*
                    433:                         * It was a debugger connect packet,
                    434:                         * just drop it now
                    435:                         */
                    436:                        goto bad;
                    437:                }
                    438: #endif
                    439:                icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0);
                    440:                m = NULL;
                    441:        }
                    442:
                    443: bad:
                    444:        if (m)
                    445:                m_freem(m);
1.78      thorpej   446:        return;
                    447:
                    448: badcsum:
                    449:        m_freem(m);
1.53      itojun    450: }
1.72      itojun    451: #endif
1.53      itojun    452:
1.72      itojun    453: #ifdef INET
1.53      itojun    454: static void
1.119     matt      455: udp4_sendup(struct mbuf *m, int off /* offset of data portion */,
                    456:        struct sockaddr *src, struct socket *so)
1.53      itojun    457: {
                    458:        struct mbuf *opts = NULL;
                    459:        struct mbuf *n;
                    460:        struct inpcb *inp = NULL;
                    461:
                    462:        if (!so)
                    463:                return;
                    464:        switch (so->so_proto->pr_domain->dom_family) {
                    465:        case AF_INET:
                    466:                inp = sotoinpcb(so);
                    467:                break;
                    468: #ifdef INET6
                    469:        case AF_INET6:
                    470:                break;
                    471: #endif
                    472:        default:
                    473:                return;
                    474:        }
                    475:
1.190     christos  476: #if defined(IPSEC)
1.53      itojun    477:        /* check AH/ESP integrity. */
1.199   ! christos  478:        if (ipsec_used && so != NULL && ipsec4_in_reject_so(m, so)) {
1.169     thorpej   479:                IPSEC_STATINC(IPSEC_STAT_IN_POLVIO);
1.162     dyoung    480:                if ((n = m_copypacket(m, M_DONTWAIT)) != NULL)
1.110     itojun    481:                        icmp_error(n, ICMP_UNREACH, ICMP_UNREACH_ADMIN_PROHIBIT,
                    482:                            0, 0);
1.53      itojun    483:                return;
                    484:        }
                    485: #endif /*IPSEC*/
                    486:
1.162     dyoung    487:        if ((n = m_copypacket(m, M_DONTWAIT)) != NULL) {
1.53      itojun    488:                if (inp && (inp->inp_flags & INP_CONTROLOPTS
1.174     christos  489: #ifdef SO_OTIMESTAMP
                    490:                         || so->so_options & SO_OTIMESTAMP
                    491: #endif
1.53      itojun    492:                         || so->so_options & SO_TIMESTAMP)) {
                    493:                        struct ip *ip = mtod(n, struct ip *);
                    494:                        ip_savecontrol(inp, &opts, ip, n);
                    495:                }
                    496:
                    497:                m_adj(n, off);
                    498:                if (sbappendaddr(&so->so_rcv, src, n,
                    499:                                opts) == 0) {
                    500:                        m_freem(n);
                    501:                        if (opts)
                    502:                                m_freem(opts);
1.124     darrenr   503:                        so->so_rcv.sb_overflowed++;
1.166     thorpej   504:                        UDP_STATINC(UDP_STAT_FULLSOCK);
1.53      itojun    505:                } else
                    506:                        sorwakeup(so);
                    507:        }
                    508: }
1.72      itojun    509: #endif
1.53      itojun    510:
1.72      itojun    511: #ifdef INET
1.53      itojun    512: static int
1.119     matt      513: udp4_realinput(struct sockaddr_in *src, struct sockaddr_in *dst,
1.144     manu      514:        struct mbuf **mp, int off /* offset of udphdr */)
1.53      itojun    515: {
                    516:        u_int16_t *sport, *dport;
                    517:        int rcvcnt;
                    518:        struct in_addr *src4, *dst4;
1.109     itojun    519:        struct inpcb_hdr *inph;
1.53      itojun    520:        struct inpcb *inp;
1.144     manu      521:        struct mbuf *m = *mp;
1.53      itojun    522:
                    523:        rcvcnt = 0;
                    524:        off += sizeof(struct udphdr);   /* now, offset of payload */
                    525:
                    526:        if (src->sin_family != AF_INET || dst->sin_family != AF_INET)
                    527:                goto bad;
                    528:
                    529:        src4 = &src->sin_addr;
                    530:        sport = &src->sin_port;
                    531:        dst4 = &dst->sin_addr;
                    532:        dport = &dst->sin_port;
                    533:
1.73      itojun    534:        if (IN_MULTICAST(dst4->s_addr) ||
1.53      itojun    535:            in_broadcast(*dst4, m->m_pkthdr.rcvif)) {
                    536:                /*
                    537:                 * Deliver a multicast or broadcast datagram to *all* sockets
                    538:                 * for which the local and remote addresses and ports match
                    539:                 * those of the incoming datagram.  This allows more than
                    540:                 * one process to receive multi/broadcasts on the same port.
                    541:                 * (This really ought to be done for unicast datagrams as
                    542:                 * well, but that would cause problems with existing
                    543:                 * applications that open both address-specific sockets and
                    544:                 * a wildcard socket listening to the same port -- they would
                    545:                 * end up receiving duplicates of every unicast datagram.
                    546:                 * Those applications open the multiple sockets to overcome an
                    547:                 * inadequacy of the UDP socket interface, but for backwards
                    548:                 * compatibility we avoid the problem here rather than
                    549:                 * fixing the interface.  Maybe 4.5BSD will remedy this?)
                    550:                 */
                    551:
                    552:                /*
1.92      itojun    553:                 * KAME note: traditionally we dropped udpiphdr from mbuf here.
1.71      itojun    554:                 * we need udpiphdr for IPsec processing so we do that later.
1.53      itojun    555:                 */
                    556:                /*
                    557:                 * Locate pcb(s) for datagram.
                    558:                 */
1.191     christos  559:                TAILQ_FOREACH(inph, &udbtable.inpt_queue, inph_queue) {
1.109     itojun    560:                        inp = (struct inpcb *)inph;
                    561:                        if (inp->inp_af != AF_INET)
                    562:                                continue;
                    563:
1.53      itojun    564:                        if (inp->inp_lport != *dport)
                    565:                                continue;
                    566:                        if (!in_nullhost(inp->inp_laddr)) {
                    567:                                if (!in_hosteq(inp->inp_laddr, *dst4))
                    568:                                        continue;
                    569:                        }
                    570:                        if (!in_nullhost(inp->inp_faddr)) {
                    571:                                if (!in_hosteq(inp->inp_faddr, *src4) ||
                    572:                                    inp->inp_fport != *sport)
                    573:                                        continue;
                    574:                        }
                    575:
                    576:                        udp4_sendup(m, off, (struct sockaddr *)src,
                    577:                                inp->inp_socket);
                    578:                        rcvcnt++;
                    579:
                    580:                        /*
                    581:                         * Don't look for additional matches if this one does
                    582:                         * not have either the SO_REUSEPORT or SO_REUSEADDR
                    583:                         * socket options set.  This heuristic avoids searching
                    584:                         * through all pcbs in the common case of a non-shared
                    585:                         * port.  It assumes that an application will never
                    586:                         * clear these options after setting them.
                    587:                         */
                    588:                        if ((inp->inp_socket->so_options &
                    589:                            (SO_REUSEPORT|SO_REUSEADDR)) == 0)
                    590:                                break;
                    591:                }
                    592:        } else {
                    593:                /*
                    594:                 * Locate pcb for datagram.
                    595:                 */
1.180     dyoung    596:                inp = in_pcblookup_connect(&udbtable, *src4, *sport, *dst4,
                    597:                    *dport, 0);
1.53      itojun    598:                if (inp == 0) {
1.166     thorpej   599:                        UDP_STATINC(UDP_STAT_PCBHASHMISS);
1.53      itojun    600:                        inp = in_pcblookup_bind(&udbtable, *dst4, *dport);
1.82      itojun    601:                        if (inp == 0)
1.53      itojun    602:                                return rcvcnt;
                    603:                }
                    604:
1.190     christos  605: #ifdef IPSEC
1.130     manu      606:                /* Handle ESP over UDP */
                    607:                if (inp->inp_flags & INP_ESPINUDP_ALL) {
                    608:                        struct sockaddr *sa = (struct sockaddr *)src;
                    609:
1.144     manu      610:                        switch(udp4_espinudp(mp, off, sa, inp->inp_socket)) {
                    611:                        case -1:        /* Error, m was freeed */
                    612:                                rcvcnt = -1;
                    613:                                goto bad;
                    614:                                break;
                    615:
                    616:                        case 1:         /* ESP over UDP */
1.130     manu      617:                                rcvcnt++;
                    618:                                goto bad;
1.144     manu      619:                                break;
                    620:
                    621:                        case 0:         /* plain UDP */
                    622:                        default:        /* Unexpected */
                    623:                                /*
                    624:                                 * Normal UDP processing will take place
                    625:                                 * m may have changed.
                    626:                                 */
                    627:                                m = *mp;
                    628:                                break;
1.130     manu      629:                        }
                    630:                }
1.189     christos  631: #endif
1.130     manu      632:
1.178     minskim   633:                /*
                    634:                 * Check the minimum TTL for socket.
                    635:                 */
                    636:                if (mtod(m, struct ip *)->ip_ttl < inp->inp_ip_minttl)
                    637:                        goto bad;
                    638:
1.53      itojun    639:                udp4_sendup(m, off, (struct sockaddr *)src, inp->inp_socket);
                    640:                rcvcnt++;
                    641:        }
                    642:
                    643: bad:
                    644:        return rcvcnt;
                    645: }
1.72      itojun    646: #endif
1.53      itojun    647:
1.72      itojun    648: #ifdef INET
1.1       cgd       649: /*
                    650:  * Notify a udp user of an asynchronous error;
                    651:  * just wake up so that he can collect error status.
                    652:  */
1.7       mycroft   653: static void
1.119     matt      654: udp_notify(struct inpcb *inp, int errno)
1.1       cgd       655: {
                    656:        inp->inp_socket->so_error = errno;
                    657:        sorwakeup(inp->inp_socket);
                    658:        sowwakeup(inp->inp_socket);
                    659: }
                    660:
1.27      christos  661: void *
1.157     dyoung    662: udp_ctlinput(int cmd, const struct sockaddr *sa, void *v)
1.1       cgd       663: {
1.66      augustss  664:        struct ip *ip = v;
                    665:        struct udphdr *uh;
1.119     matt      666:        void (*notify)(struct inpcb *, int) = udp_notify;
1.21      mycroft   667:        int errno;
1.1       cgd       668:
1.53      itojun    669:        if (sa->sa_family != AF_INET
                    670:         || sa->sa_len != sizeof(struct sockaddr_in))
1.51      itojun    671:                return NULL;
1.20      mycroft   672:        if ((unsigned)cmd >= PRC_NCMDS)
1.27      christos  673:                return NULL;
1.20      mycroft   674:        errno = inetctlerrmap[cmd];
1.18      mycroft   675:        if (PRC_IS_REDIRECT(cmd))
1.19      mycroft   676:                notify = in_rtchange, ip = 0;
1.18      mycroft   677:        else if (cmd == PRC_HOSTDEAD)
1.19      mycroft   678:                ip = 0;
1.23      cgd       679:        else if (errno == 0)
1.27      christos  680:                return NULL;
1.19      mycroft   681:        if (ip) {
1.158     christos  682:                uh = (struct udphdr *)((char *)ip + (ip->ip_hl << 2));
1.157     dyoung    683:                in_pcbnotify(&udbtable, satocsin(sa)->sin_addr, uh->uh_dport,
1.34      mycroft   684:                    ip->ip_src, uh->uh_sport, errno, notify);
1.53      itojun    685:
                    686:                /* XXX mapped address case */
1.19      mycroft   687:        } else
1.157     dyoung    688:                in_pcbnotifyall(&udbtable, satocsin(sa)->sin_addr, errno,
1.34      mycroft   689:                    notify);
1.27      christos  690:        return NULL;
1.1       cgd       691: }
                    692:
1.7       mycroft   693: int
1.173     plunky    694: udp_ctloutput(int op, struct socket *so, struct sockopt *sopt)
1.130     manu      695: {
                    696:        int s;
                    697:        int error = 0;
                    698:        struct inpcb *inp;
                    699:        int family;
1.173     plunky    700:        int optval;
1.130     manu      701:
                    702:        family = so->so_proto->pr_domain->dom_family;
                    703:
                    704:        s = splsoftnet();
                    705:        switch (family) {
                    706: #ifdef INET
                    707:        case PF_INET:
1.173     plunky    708:                if (sopt->sopt_level != IPPROTO_UDP) {
                    709:                        error = ip_ctloutput(op, so, sopt);
1.130     manu      710:                        goto end;
                    711:                }
                    712:                break;
                    713: #endif
                    714: #ifdef INET6
                    715:        case PF_INET6:
1.173     plunky    716:                if (sopt->sopt_level != IPPROTO_UDP) {
                    717:                        error = ip6_ctloutput(op, so, sopt);
1.130     manu      718:                        goto end;
                    719:                }
                    720:                break;
                    721: #endif
                    722:        default:
                    723:                error = EAFNOSUPPORT;
                    724:                goto end;
                    725:        }
                    726:
                    727:
                    728:        switch (op) {
                    729:        case PRCO_SETOPT:
                    730:                inp = sotoinpcb(so);
                    731:
1.173     plunky    732:                switch (sopt->sopt_name) {
1.130     manu      733:                case UDP_ENCAP:
1.173     plunky    734:                        error = sockopt_getint(sopt, &optval);
                    735:                        if (error)
1.153     yamt      736:                                break;
1.131     perry     737:
1.173     plunky    738:                        switch(optval) {
1.130     manu      739:                        case 0:
                    740:                                inp->inp_flags &= ~INP_ESPINUDP_ALL;
                    741:                                break;
                    742:
                    743:                        case UDP_ENCAP_ESPINUDP:
                    744:                                inp->inp_flags &= ~INP_ESPINUDP_ALL;
                    745:                                inp->inp_flags |= INP_ESPINUDP;
                    746:                                break;
1.131     perry     747:
1.130     manu      748:                        case UDP_ENCAP_ESPINUDP_NON_IKE:
                    749:                                inp->inp_flags &= ~INP_ESPINUDP_ALL;
                    750:                                inp->inp_flags |= INP_ESPINUDP_NON_IKE;
                    751:                                break;
                    752:                        default:
                    753:                                error = EINVAL;
                    754:                                break;
                    755:                        }
                    756:                        break;
1.183     christos  757:
1.130     manu      758:                default:
                    759:                        error = ENOPROTOOPT;
                    760:                        break;
                    761:                }
                    762:                break;
                    763:
                    764:        default:
                    765:                error = EINVAL;
                    766:                break;
1.131     perry     767:        }
                    768:
1.130     manu      769: end:
                    770:        splx(s);
                    771:        return error;
                    772: }
1.131     perry     773:
1.130     manu      774:
                    775: int
1.27      christos  776: udp_output(struct mbuf *m, ...)
                    777: {
1.66      augustss  778:        struct inpcb *inp;
                    779:        struct udpiphdr *ui;
1.125     thorpej   780:        struct route *ro;
1.66      augustss  781:        int len = m->m_pkthdr.len;
1.31      mycroft   782:        int error = 0;
1.27      christos  783:        va_list ap;
                    784:
1.98      matt      785:        MCLAIM(m, &udp_tx_mowner);
1.27      christos  786:        va_start(ap, m);
                    787:        inp = va_arg(ap, struct inpcb *);
                    788:        va_end(ap);
1.1       cgd       789:
                    790:        /*
                    791:         * Calculate data length and get a mbuf
                    792:         * for UDP and IP headers.
                    793:         */
1.13      mycroft   794:        M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT);
                    795:        if (m == 0) {
                    796:                error = ENOBUFS;
1.39      thorpej   797:                goto release;
                    798:        }
                    799:
                    800:        /*
                    801:         * Compute the packet length of the IP header, and
                    802:         * punt if the length looks bogus.
                    803:         */
1.96      itojun    804:        if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) {
1.39      thorpej   805:                error = EMSGSIZE;
1.13      mycroft   806:                goto release;
                    807:        }
1.1       cgd       808:
                    809:        /*
                    810:         * Fill in mbuf with extended UDP header
                    811:         * and addresses and length put into network format.
                    812:         */
                    813:        ui = mtod(m, struct udpiphdr *);
                    814:        ui->ui_pr = IPPROTO_UDP;
                    815:        ui->ui_src = inp->inp_laddr;
                    816:        ui->ui_dst = inp->inp_faddr;
                    817:        ui->ui_sport = inp->inp_lport;
                    818:        ui->ui_dport = inp->inp_fport;
1.78      thorpej   819:        ui->ui_ulen = htons((u_int16_t)len + sizeof(struct udphdr));
1.1       cgd       820:
1.125     thorpej   821:        ro = &inp->inp_route;
                    822:
1.1       cgd       823:        /*
1.78      thorpej   824:         * Set up checksum and output datagram.
1.1       cgd       825:         */
                    826:        if (udpcksum) {
1.78      thorpej   827:                /*
                    828:                 * XXX Cache pseudo-header checksum part for
                    829:                 * XXX "connected" UDP sockets.
                    830:                 */
                    831:                ui->ui_sum = in_cksum_phdr(ui->ui_src.s_addr,
                    832:                    ui->ui_dst.s_addr, htons((u_int16_t)len +
                    833:                    sizeof(struct udphdr) + IPPROTO_UDP));
1.135     yamt      834:                m->m_pkthdr.csum_flags = M_CSUM_UDPv4;
1.78      thorpej   835:                m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
                    836:        } else
                    837:                ui->ui_sum = 0;
1.96      itojun    838:        ((struct ip *)ui)->ip_len = htons(sizeof (struct udpiphdr) + len);
1.1       cgd       839:        ((struct ip *)ui)->ip_ttl = inp->inp_ip.ip_ttl; /* XXX */
                    840:        ((struct ip *)ui)->ip_tos = inp->inp_ip.ip_tos; /* XXX */
1.166     thorpej   841:        UDP_STATINC(UDP_STAT_OPACKETS);
1.48      itojun    842:
1.125     thorpej   843:        return (ip_output(m, inp->inp_options, ro,
1.12      mycroft   844:            inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST),
1.107     itojun    845:            inp->inp_moptions, inp->inp_socket));
1.1       cgd       846:
                    847: release:
                    848:        m_freem(m);
                    849:        return (error);
                    850: }
                    851:
1.196     rmind     852: static int
                    853: udp_attach(struct socket *so, int proto)
                    854: {
                    855:        struct inpcb *inp;
                    856:        int error;
                    857:
                    858:        KASSERT(sotoinpcb(so) == NULL);
                    859:
                    860:        /* Assign the lock (must happen even if we will error out). */
                    861:        sosetlock(so);
                    862:
                    863: #ifdef MBUFTRACE
                    864:        so->so_mowner = &udp_mowner;
                    865:        so->so_rcv.sb_mowner = &udp_rx_mowner;
                    866:        so->so_snd.sb_mowner = &udp_tx_mowner;
                    867: #endif
                    868:        if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
                    869:                error = soreserve(so, udp_sendspace, udp_recvspace);
                    870:                if (error) {
                    871:                        return error;
                    872:                }
                    873:        }
                    874:
                    875:        error = in_pcballoc(so, &udbtable);
                    876:        if (error) {
                    877:                return error;
                    878:        }
                    879:        inp = sotoinpcb(so);
                    880:        inp->inp_ip.ip_ttl = ip_defttl;
                    881:        KASSERT(solocked(so));
                    882:
                    883:        return error;
                    884: }
                    885:
                    886: static void
                    887: udp_detach(struct socket *so)
                    888: {
                    889:        struct inpcb *inp;
                    890:
                    891:        KASSERT(solocked(so));
                    892:        inp = sotoinpcb(so);
                    893:        KASSERT(inp != NULL);
                    894:        in_pcbdetach(inp);
                    895: }
1.1       cgd       896:
1.195     rmind     897: static int
1.119     matt      898: udp_usrreq(struct socket *so, int req, struct mbuf *m, struct mbuf *nam,
1.195     rmind     899:     struct mbuf *control, struct lwp *l)
1.1       cgd       900: {
1.66      augustss  901:        struct inpcb *inp;
1.196     rmind     902:        int s, error = 0;
1.1       cgd       903:
1.196     rmind     904:        KASSERT(req != PRU_ATTACH);
                    905:        KASSERT(req != PRU_DETACH);
1.59      thorpej   906:
1.196     rmind     907:        if (req == PRU_CONTROL) {
                    908:                return in_control(so, (long)m, (void *)nam,
                    909:                    (struct ifnet *)control, l);
                    910:        }
1.149     tls       911:        s = splsoftnet();
1.60      thorpej   912:        if (req == PRU_PURGEIF) {
1.170     ad        913:                mutex_enter(softnet_lock);
1.80      itojun    914:                in_pcbpurgeif0(&udbtable, (struct ifnet *)control);
1.60      thorpej   915:                in_purgeif((struct ifnet *)control);
                    916:                in_pcbpurgeif(&udbtable, (struct ifnet *)control);
1.170     ad        917:                mutex_exit(softnet_lock);
1.149     tls       918:                splx(s);
1.196     rmind     919:                return 0;
1.59      thorpej   920:        }
1.31      mycroft   921:
1.196     rmind     922:        KASSERT(solocked(so));
1.31      mycroft   923:        inp = sotoinpcb(so);
1.196     rmind     924:
                    925:        KASSERT(!control || (req == PRU_SEND || req == PRU_SENDOOB));
                    926:        if (inp == NULL) {
                    927:                splx(s);
                    928:                return EINVAL;
1.31      mycroft   929:        }
                    930:
1.1       cgd       931:        /*
                    932:         * Note: need to block udp_input while changing
                    933:         * the udp pcb queue and/or pcb addresses.
                    934:         */
                    935:        switch (req) {
                    936:        case PRU_BIND:
1.148     ad        937:                error = in_pcbbind(inp, nam, l);
1.1       cgd       938:                break;
                    939:
                    940:        case PRU_LISTEN:
                    941:                error = EOPNOTSUPP;
                    942:                break;
                    943:
                    944:        case PRU_CONNECT:
1.148     ad        945:                error = in_pcbconnect(inp, nam, l);
1.31      mycroft   946:                if (error)
1.1       cgd       947:                        break;
1.31      mycroft   948:                soisconnected(so);
1.1       cgd       949:                break;
                    950:
                    951:        case PRU_CONNECT2:
                    952:                error = EOPNOTSUPP;
                    953:                break;
                    954:
                    955:        case PRU_DISCONNECT:
1.31      mycroft   956:                /*soisdisconnected(so);*/
                    957:                so->so_state &= ~SS_ISCONNECTED;        /* XXX */
1.1       cgd       958:                in_pcbdisconnect(inp);
1.34      mycroft   959:                inp->inp_laddr = zeroin_addr;           /* XXX */
1.35      mycroft   960:                in_pcbstate(inp, INP_BOUND);            /* XXX */
1.1       cgd       961:                break;
                    962:
                    963:        case PRU_SHUTDOWN:
                    964:                socantsendmore(so);
                    965:                break;
                    966:
1.31      mycroft   967:        case PRU_RCVD:
                    968:                error = EOPNOTSUPP;
1.1       cgd       969:                break;
                    970:
1.31      mycroft   971:        case PRU_SEND:
1.32      mycroft   972:                if (control && control->m_len) {
                    973:                        m_freem(control);
                    974:                        m_freem(m);
                    975:                        error = EINVAL;
                    976:                        break;
                    977:                }
1.31      mycroft   978:        {
1.35      mycroft   979:                struct in_addr laddr;                   /* XXX */
1.1       cgd       980:
1.181     mrg       981:                memset(&laddr, 0, sizeof laddr);
1.31      mycroft   982:                if (nam) {
1.35      mycroft   983:                        laddr = inp->inp_laddr;         /* XXX */
1.31      mycroft   984:                        if ((so->so_state & SS_ISCONNECTED) != 0) {
                    985:                                error = EISCONN;
1.32      mycroft   986:                                goto die;
1.31      mycroft   987:                        }
1.148     ad        988:                        error = in_pcbconnect(inp, nam, l);
1.100     matt      989:                        if (error)
                    990:                                goto die;
1.31      mycroft   991:                } else {
                    992:                        if ((so->so_state & SS_ISCONNECTED) == 0) {
                    993:                                error = ENOTCONN;
1.32      mycroft   994:                                goto die;
1.31      mycroft   995:                        }
                    996:                }
1.33      mycroft   997:                error = udp_output(m, inp);
1.100     matt      998:                m = NULL;
1.31      mycroft   999:                if (nam) {
                   1000:                        in_pcbdisconnect(inp);
1.35      mycroft  1001:                        inp->inp_laddr = laddr;         /* XXX */
                   1002:                        in_pcbstate(inp, INP_BOUND);    /* XXX */
1.31      mycroft  1003:                }
1.100     matt     1004:          die:
                   1005:                if (m)
                   1006:                        m_freem(m);
1.31      mycroft  1007:        }
1.1       cgd      1008:                break;
                   1009:
                   1010:        case PRU_SENSE:
                   1011:                /*
                   1012:                 * stat: don't bother with a blocksize.
                   1013:                 */
1.31      mycroft  1014:                splx(s);
1.1       cgd      1015:                return (0);
                   1016:
1.31      mycroft  1017:        case PRU_RCVOOB:
                   1018:                error =  EOPNOTSUPP;
                   1019:                break;
                   1020:
1.1       cgd      1021:        case PRU_SENDOOB:
1.32      mycroft  1022:                m_freem(control);
1.31      mycroft  1023:                m_freem(m);
1.1       cgd      1024:                error =  EOPNOTSUPP;
                   1025:                break;
                   1026:
1.31      mycroft  1027:        case PRU_SOCKADDR:
                   1028:                in_setsockaddr(inp, nam);
                   1029:                break;
                   1030:
                   1031:        case PRU_PEERADDR:
                   1032:                in_setpeeraddr(inp, nam);
                   1033:                break;
1.1       cgd      1034:
                   1035:        default:
                   1036:                panic("udp_usrreq");
                   1037:        }
1.196     rmind    1038:        splx(s);
1.1       cgd      1039:
1.196     rmind    1040:        return error;
1.13      mycroft  1041: }
                   1042:
1.166     thorpej  1043: static int
                   1044: sysctl_net_inet_udp_stats(SYSCTLFN_ARGS)
                   1045: {
                   1046:
1.172     thorpej  1047:        return (NETSTAT_SYSCTL(udpstat_percpu, UDP_NSTATS));
1.166     thorpej  1048: }
                   1049:
1.13      mycroft  1050: /*
                   1051:  * Sysctl for udp variables.
                   1052:  */
1.179     pooka    1053: static void
                   1054: sysctl_net_inet_udp_setup(struct sysctllog **clog)
1.13      mycroft  1055: {
1.194     pooka    1056:
1.116     atatat   1057:        sysctl_createv(clog, 0, NULL, NULL,
                   1058:                       CTLFLAG_PERMANENT,
1.114     atatat   1059:                       CTLTYPE_NODE, "inet", NULL,
                   1060:                       NULL, 0, NULL, 0,
                   1061:                       CTL_NET, PF_INET, CTL_EOL);
1.116     atatat   1062:        sysctl_createv(clog, 0, NULL, NULL,
                   1063:                       CTLFLAG_PERMANENT,
1.122     atatat   1064:                       CTLTYPE_NODE, "udp",
                   1065:                       SYSCTL_DESCR("UDPv4 related settings"),
1.114     atatat   1066:                       NULL, 0, NULL, 0,
                   1067:                       CTL_NET, PF_INET, IPPROTO_UDP, CTL_EOL);
                   1068:
1.116     atatat   1069:        sysctl_createv(clog, 0, NULL, NULL,
                   1070:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.122     atatat   1071:                       CTLTYPE_INT, "checksum",
1.123     heas     1072:                       SYSCTL_DESCR("Compute UDP checksums"),
1.114     atatat   1073:                       NULL, 0, &udpcksum, 0,
                   1074:                       CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_CHECKSUM,
                   1075:                       CTL_EOL);
1.116     atatat   1076:        sysctl_createv(clog, 0, NULL, NULL,
                   1077:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.122     atatat   1078:                       CTLTYPE_INT, "sendspace",
                   1079:                       SYSCTL_DESCR("Default UDP send buffer size"),
1.114     atatat   1080:                       NULL, 0, &udp_sendspace, 0,
                   1081:                       CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_SENDSPACE,
                   1082:                       CTL_EOL);
1.116     atatat   1083:        sysctl_createv(clog, 0, NULL, NULL,
                   1084:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.122     atatat   1085:                       CTLTYPE_INT, "recvspace",
                   1086:                       SYSCTL_DESCR("Default UDP receive buffer size"),
1.114     atatat   1087:                       NULL, 0, &udp_recvspace, 0,
                   1088:                       CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_RECVSPACE,
                   1089:                       CTL_EOL);
1.125     thorpej  1090:        sysctl_createv(clog, 0, NULL, NULL,
                   1091:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1092:                       CTLTYPE_INT, "do_loopback_cksum",
                   1093:                       SYSCTL_DESCR("Perform UDP checksum on loopback"),
                   1094:                       NULL, 0, &udp_do_loopback_cksum, 0,
                   1095:                       CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_LOOPBACKCKSUM,
                   1096:                       CTL_EOL);
1.132     atatat   1097:        sysctl_createv(clog, 0, NULL, NULL,
                   1098:                       CTLFLAG_PERMANENT,
1.134     atatat   1099:                       CTLTYPE_STRUCT, "pcblist",
1.132     atatat   1100:                       SYSCTL_DESCR("UDP protocol control block list"),
                   1101:                       sysctl_inpcblist, 0, &udbtable, 0,
                   1102:                       CTL_NET, PF_INET, IPPROTO_UDP, CTL_CREATE,
                   1103:                       CTL_EOL);
1.139     elad     1104:        sysctl_createv(clog, 0, NULL, NULL,
                   1105:                       CTLFLAG_PERMANENT,
                   1106:                       CTLTYPE_STRUCT, "stats",
                   1107:                       SYSCTL_DESCR("UDP statistics"),
1.166     thorpej  1108:                       sysctl_net_inet_udp_stats, 0, NULL, 0,
1.139     elad     1109:                       CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_STATS,
                   1110:                       CTL_EOL);
1.1       cgd      1111: }
1.72      itojun   1112: #endif
1.130     manu     1113:
1.166     thorpej  1114: void
                   1115: udp_statinc(u_int stat)
                   1116: {
                   1117:
                   1118:        KASSERT(stat < UDP_NSTATS);
                   1119:        UDP_STATINC(stat);
                   1120: }
                   1121:
1.190     christos 1122: #if defined(INET) && defined(IPSEC)
1.130     manu     1123: /*
                   1124:  * Returns:
                   1125:  * 1 if the packet was processed
                   1126:  * 0 if normal UDP processing should take place
1.144     manu     1127:  * -1 if an error occurent and m was freed
1.130     manu     1128:  */
                   1129: static int
1.154     yamt     1130: udp4_espinudp(struct mbuf **mp, int off, struct sockaddr *src,
1.151     christos 1131:     struct socket *so)
1.130     manu     1132: {
                   1133:        size_t len;
1.158     christos 1134:        void *data;
1.130     manu     1135:        struct inpcb *inp;
                   1136:        size_t skip = 0;
                   1137:        size_t minlen;
                   1138:        size_t iphdrlen;
                   1139:        struct ip *ip;
1.136     manu     1140:        struct m_tag *tag;
                   1141:        struct udphdr *udphdr;
                   1142:        u_int16_t sport, dport;
1.144     manu     1143:        struct mbuf *m = *mp;
1.130     manu     1144:
1.131     perry    1145:        /*
1.130     manu     1146:         * Collapse the mbuf chain if the first mbuf is too short
                   1147:         * The longest case is: UDP + non ESP marker + ESP
                   1148:         */
                   1149:        minlen = off + sizeof(u_int64_t) + sizeof(struct esp);
                   1150:        if (minlen > m->m_pkthdr.len)
                   1151:                minlen = m->m_pkthdr.len;
                   1152:
                   1153:        if (m->m_len < minlen) {
1.144     manu     1154:                if ((*mp = m_pullup(m, minlen)) == NULL) {
1.130     manu     1155:                        printf("udp4_espinudp: m_pullup failed\n");
1.144     manu     1156:                        return -1;
1.130     manu     1157:                }
1.144     manu     1158:                m = *mp;
1.130     manu     1159:        }
                   1160:
1.131     perry    1161:        len = m->m_len - off;
1.158     christos 1162:        data = mtod(m, char *) + off;
1.130     manu     1163:        inp = sotoinpcb(so);
                   1164:
                   1165:        /* Ignore keepalive packets */
1.158     christos 1166:        if ((len == 1) && (*(unsigned char *)data == 0xff)) {
1.188     christos 1167:                m_free(m);
                   1168:                *mp = NULL; /* avoid any further processiong by caller ... */
1.130     manu     1169:                return 1;
                   1170:        }
                   1171:
1.131     perry    1172:        /*
                   1173:         * Check that the payload is long enough to hold
1.130     manu     1174:         * an ESP header and compute the length of encapsulation
1.131     perry    1175:         * header to remove
1.130     manu     1176:         */
                   1177:        if (inp->inp_flags & INP_ESPINUDP) {
                   1178:                u_int32_t *st = (u_int32_t *)data;
                   1179:
                   1180:                if ((len <= sizeof(struct esp)) || (*st == 0))
                   1181:                        return 0; /* Normal UDP processing */
                   1182:
                   1183:                skip = sizeof(struct udphdr);
                   1184:        }
                   1185:
                   1186:        if (inp->inp_flags & INP_ESPINUDP_NON_IKE) {
1.142     kleink   1187:                u_int32_t *st = (u_int32_t *)data;
1.130     manu     1188:
                   1189:                if ((len <= sizeof(u_int64_t) + sizeof(struct esp))
1.142     kleink   1190:                    || ((st[0] | st[1]) != 0))
1.130     manu     1191:                        return 0; /* Normal UDP processing */
1.131     perry    1192:
1.130     manu     1193:                skip = sizeof(struct udphdr) + sizeof(u_int64_t);
                   1194:        }
                   1195:
                   1196:        /*
1.136     manu     1197:         * Get the UDP ports. They are handled in network
                   1198:         * order everywhere in IPSEC_NAT_T code.
                   1199:         */
1.158     christos 1200:        udphdr = (struct udphdr *)((char *)data - skip);
1.136     manu     1201:        sport = udphdr->uh_sport;
                   1202:        dport = udphdr->uh_dport;
                   1203:
                   1204:        /*
1.130     manu     1205:         * Remove the UDP header (and possibly the non ESP marker)
                   1206:         * IP header lendth is iphdrlen
1.131     perry    1207:         * Before:
1.130     manu     1208:         *   <--- off --->
                   1209:         *   +----+------+-----+
                   1210:         *   | IP |  UDP | ESP |
                   1211:         *   +----+------+-----+
                   1212:         *        <-skip->
                   1213:         * After:
                   1214:         *          +----+-----+
                   1215:         *          | IP | ESP |
                   1216:         *          +----+-----+
                   1217:         *   <-skip->
                   1218:         */
                   1219:        iphdrlen = off - sizeof(struct udphdr);
1.158     christos 1220:        memmove(mtod(m, char *) + skip, mtod(m, void *), iphdrlen);
1.130     manu     1221:        m_adj(m, skip);
                   1222:
                   1223:        ip = mtod(m, struct ip *);
                   1224:        ip->ip_len = htons(ntohs(ip->ip_len) - skip);
                   1225:        ip->ip_p = IPPROTO_ESP;
                   1226:
                   1227:        /*
1.188     christos 1228:         * We have modified the packet - it is now ESP, so we should not
                   1229:         * return to UDP processing ...
                   1230:         *
1.136     manu     1231:         * Add a PACKET_TAG_IPSEC_NAT_T_PORT tag to remember
                   1232:         * the source UDP port. This is required if we want
                   1233:         * to select the right SPD for multiple hosts behind
                   1234:         * same NAT
                   1235:         */
1.137     manu     1236:        if ((tag = m_tag_get(PACKET_TAG_IPSEC_NAT_T_PORTS,
                   1237:            sizeof(sport) + sizeof(dport), M_DONTWAIT)) == NULL) {
                   1238:                printf("udp4_espinudp: m_tag_get failed\n");
1.188     christos 1239:                m_freem(m);
                   1240:                return -1;
1.137     manu     1241:        }
1.136     manu     1242:        ((u_int16_t *)(tag + 1))[0] = sport;
                   1243:        ((u_int16_t *)(tag + 1))[1] = dport;
1.188     christos 1244:        m_tag_prepend(m, tag);
1.136     manu     1245:
1.190     christos 1246: #ifdef IPSEC
1.199   ! christos 1247:        if (ipsec_used)
        !          1248:                ipsec4_common_input(m, iphdrlen, IPPROTO_ESP);
        !          1249:        /* XXX: else */
1.147     christos 1250: #else
1.188     christos 1251:        esp4_input(m, iphdrlen);
1.147     christos 1252: #endif
1.130     manu     1253:
1.185     liamjfoy 1254:        /* We handled it, it shouldn't be handled by UDP */
1.188     christos 1255:        *mp = NULL; /* avoid free by caller ... */
1.130     manu     1256:        return 1;
                   1257: }
                   1258: #endif
1.195     rmind    1259:
1.197     rmind    1260: PR_WRAP_USRREQS(udp)
                   1261: #define        udp_attach      udp_attach_wrapper
                   1262: #define        udp_detach      udp_detach_wrapper
1.195     rmind    1263: #define        udp_usrreq      udp_usrreq_wrapper
                   1264:
                   1265: const struct pr_usrreqs udp_usrreqs = {
1.196     rmind    1266:        .pr_attach      = udp_attach,
                   1267:        .pr_detach      = udp_detach,
1.195     rmind    1268:        .pr_generic     = udp_usrreq,
                   1269: };

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