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Annotation of src/sys/netinet/udp_usrreq.c, Revision 1.190.2.4

1.190.2.3  rmind       1: /*     $NetBSD$        */
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:
1.190.2.1  rmind      63: /*
                     64:  * UDP protocol implementation.
                     65:  * Per RFC 768, August, 1980.
                     66:  */
                     67:
1.91      lukem      68: #include <sys/cdefs.h>
1.190.2.3  rmind      69: __KERNEL_RCSID(0, "$NetBSD$");
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>
                     80: #include <sys/protosw.h>
                     81: #include <sys/socket.h>
                     82: #include <sys/socketvar.h>
1.27      christos   83: #include <sys/systm.h>
1.190.2.1  rmind      84: #include <sys/kmem.h>
1.53      itojun     85: #include <sys/domain.h>
1.27      christos   86: #include <sys/sysctl.h>
1.1       cgd        87:
1.5       mycroft    88: #include <net/if.h>
                     89: #include <net/route.h>
1.1       cgd        90:
1.5       mycroft    91: #include <netinet/in.h>
                     92: #include <netinet/in_systm.h>
1.15      cgd        93: #include <netinet/in_var.h>
1.5       mycroft    94: #include <netinet/ip.h>
                     95: #include <netinet/in_pcb.h>
                     96: #include <netinet/ip_var.h>
                     97: #include <netinet/ip_icmp.h>
                     98: #include <netinet/udp.h>
                     99: #include <netinet/udp_var.h>
1.166     thorpej   100: #include <netinet/udp_private.h>
1.1       cgd       101:
1.53      itojun    102: #ifdef INET6
                    103: #include <netinet/ip6.h>
                    104: #include <netinet/icmp6.h>
                    105: #include <netinet6/ip6_var.h>
1.167     thorpej   106: #include <netinet6/ip6_private.h>
1.53      itojun    107: #include <netinet6/in6_pcb.h>
                    108: #include <netinet6/udp6_var.h>
1.168     thorpej   109: #include <netinet6/udp6_private.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:
1.190     christos  117: #ifdef IPSEC
1.105     jonathan  118: #include <netipsec/ipsec.h>
1.169     thorpej   119: #include <netipsec/ipsec_var.h>
                    120: #include <netipsec/ipsec_private.h>
1.147     christos  121: #include <netipsec/esp.h>
1.105     jonathan  122: #ifdef INET6
                    123: #include <netipsec/ipsec6.h>
                    124: #endif
1.190     christos  125: #endif /* IPSEC */
1.105     jonathan  126:
1.174     christos  127: #ifdef COMPAT_50
                    128: #include <compat/sys/socket.h>
                    129: #endif
                    130:
1.64      ws        131: #ifdef IPKDB
                    132: #include <ipkdb/ipkdb.h>
                    133: #endif
                    134:
1.8       mycroft   135: int    udpcksum = 1;
1.141     yamt      136: int    udp_do_loopback_cksum = 0;
1.93      matt      137:
1.190.2.1  rmind     138: inpcbtable_t *         udbtable __read_mostly;
                    139: percpu_t *             udpstat_percpu;
1.8       mycroft   140:
1.72      itojun    141: #ifdef INET
1.190     christos  142: #ifdef IPSEC
1.144     manu      143: static int udp4_espinudp (struct mbuf **, int, struct sockaddr *,
1.130     manu      144:        struct socket *);
1.189     christos  145: #endif
1.119     matt      146: static void udp4_sendup (struct mbuf *, int, struct sockaddr *,
                    147:        struct socket *);
                    148: static int udp4_realinput (struct sockaddr_in *, struct sockaddr_in *,
1.144     manu      149:        struct mbuf **, int);
1.129     yamt      150: static int udp4_input_checksum(struct mbuf *, const struct udphdr *, int, int);
1.72      itojun    151: #endif
1.7       mycroft   152:
1.26      mycroft   153: #ifndef UDBHASHSIZE
                    154: #define        UDBHASHSIZE     128
                    155: #endif
                    156: int    udbhashsize = UDBHASHSIZE;
                    157:
1.190.2.1  rmind     158: static int     udp_sendspace = 9216;
                    159: static int     udp_recvspace = 40 * (1024 + sizeof(struct sockaddr_in));
                    160:
1.98      matt      161: #ifdef MBUFTRACE
1.150     dogcow    162: struct mowner udp_mowner = MOWNER_INIT("udp", "");
                    163: struct mowner udp_rx_mowner = MOWNER_INIT("udp", "rx");
                    164: struct mowner udp_tx_mowner = MOWNER_INIT("udp", "tx");
1.98      matt      165: #endif
                    166:
1.78      thorpej   167: #ifdef UDP_CSUM_COUNTERS
                    168: #include <sys/device.h>
                    169:
1.140     yamt      170: #if defined(INET)
1.78      thorpej   171: struct evcnt udp_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    172:     NULL, "udp", "hwcsum bad");
                    173: struct evcnt udp_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    174:     NULL, "udp", "hwcsum ok");
                    175: struct evcnt udp_hwcsum_data = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    176:     NULL, "udp", "hwcsum data");
                    177: struct evcnt udp_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    178:     NULL, "udp", "swcsum");
                    179:
1.120     matt      180: EVCNT_ATTACH_STATIC(udp_hwcsum_bad);
                    181: EVCNT_ATTACH_STATIC(udp_hwcsum_ok);
                    182: EVCNT_ATTACH_STATIC(udp_hwcsum_data);
                    183: EVCNT_ATTACH_STATIC(udp_swcsum);
1.140     yamt      184: #endif /* defined(INET) */
                    185:
                    186: #define        UDP_CSUM_COUNTER_INCR(ev)       (ev)->ev_count++
1.78      thorpej   187: #else
                    188: #define        UDP_CSUM_COUNTER_INCR(ev)       /* nothing */
                    189: #endif /* UDP_CSUM_COUNTERS */
                    190:
1.179     pooka     191: static void sysctl_net_inet_udp_setup(struct sysctllog **);
                    192:
1.7       mycroft   193: void
1.119     matt      194: udp_init(void)
1.1       cgd       195: {
1.190.2.1  rmind     196:        udbtable = inpcb_init(udbhashsize, udbhashsize, 0);
1.179     pooka     197:        sysctl_net_inet_udp_setup(NULL);
                    198:
1.98      matt      199:        MOWNER_ATTACH(&udp_tx_mowner);
                    200:        MOWNER_ATTACH(&udp_rx_mowner);
                    201:        MOWNER_ATTACH(&udp_mowner);
1.166     thorpej   202:
1.171     yamt      203: #ifdef INET
1.166     thorpej   204:        udpstat_percpu = percpu_alloc(sizeof(uint64_t) * UDP_NSTATS);
1.171     yamt      205: #endif
1.1       cgd       206: }
                    207:
1.129     yamt      208: /*
                    209:  * Checksum extended UDP header and data.
                    210:  */
                    211:
                    212: int
                    213: udp_input_checksum(int af, struct mbuf *m, const struct udphdr *uh,
                    214:     int iphlen, int len)
                    215: {
                    216:        switch (af) {
1.72      itojun    217: #ifdef INET
1.129     yamt      218:        case AF_INET:
                    219:                return udp4_input_checksum(m, uh, iphlen, len);
                    220: #endif
                    221: #ifdef INET6
                    222:        case AF_INET6:
                    223:                return udp6_input_checksum(m, uh, iphlen, len);
                    224: #endif
1.190.2.1  rmind     225:        default:
                    226:                KASSERT(false);
1.129     yamt      227:        }
                    228:        return -1;
                    229: }
                    230:
                    231: #ifdef INET
                    232:
                    233: /*
                    234:  * Checksum extended UDP header and data.
                    235:  */
                    236:
                    237: static int
                    238: udp4_input_checksum(struct mbuf *m, const struct udphdr *uh,
                    239:     int iphlen, int len)
                    240: {
                    241:
                    242:        /*
                    243:         * XXX it's better to record and check if this mbuf is
                    244:         * already checked.
                    245:         */
                    246:
                    247:        if (uh->uh_sum == 0)
                    248:                return 0;
                    249:
                    250:        switch (m->m_pkthdr.csum_flags &
                    251:            ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_UDPv4) |
                    252:            M_CSUM_TCP_UDP_BAD | M_CSUM_DATA)) {
                    253:        case M_CSUM_UDPv4|M_CSUM_TCP_UDP_BAD:
                    254:                UDP_CSUM_COUNTER_INCR(&udp_hwcsum_bad);
                    255:                goto badcsum;
                    256:
                    257:        case M_CSUM_UDPv4|M_CSUM_DATA: {
                    258:                u_int32_t hw_csum = m->m_pkthdr.csum_data;
                    259:
                    260:                UDP_CSUM_COUNTER_INCR(&udp_hwcsum_data);
                    261:                if (m->m_pkthdr.csum_flags & M_CSUM_NO_PSEUDOHDR) {
                    262:                        const struct ip *ip =
                    263:                            mtod(m, const struct ip *);
                    264:
                    265:                        hw_csum = in_cksum_phdr(ip->ip_src.s_addr,
                    266:                            ip->ip_dst.s_addr,
                    267:                            htons(hw_csum + len + IPPROTO_UDP));
                    268:                }
                    269:                if ((hw_csum ^ 0xffff) != 0)
                    270:                        goto badcsum;
                    271:                break;
                    272:        }
                    273:
                    274:        case M_CSUM_UDPv4:
                    275:                /* Checksum was okay. */
                    276:                UDP_CSUM_COUNTER_INCR(&udp_hwcsum_ok);
                    277:                break;
                    278:
                    279:        default:
                    280:                /*
                    281:                 * Need to compute it ourselves.  Maybe skip checksum
                    282:                 * on loopback interfaces.
                    283:                 */
                    284:                if (__predict_true(!(m->m_pkthdr.rcvif->if_flags &
                    285:                                     IFF_LOOPBACK) ||
                    286:                                   udp_do_loopback_cksum)) {
                    287:                        UDP_CSUM_COUNTER_INCR(&udp_swcsum);
                    288:                        if (in4_cksum(m, IPPROTO_UDP, iphlen, len) != 0)
                    289:                                goto badcsum;
                    290:                }
                    291:                break;
                    292:        }
                    293:
                    294:        return 0;
                    295:
                    296: badcsum:
1.166     thorpej   297:        UDP_STATINC(UDP_STAT_BADSUM);
1.129     yamt      298:        return -1;
                    299: }
                    300:
1.7       mycroft   301: void
1.27      christos  302: udp_input(struct mbuf *m, ...)
1.1       cgd       303: {
1.53      itojun    304:        va_list ap;
                    305:        struct sockaddr_in src, dst;
                    306:        struct ip *ip;
                    307:        struct udphdr *uh;
1.190.2.4! rmind     308:        int iphlen, len, n;
        !           309:        uint16_t ip_len;
1.53      itojun    310:
                    311:        va_start(ap, m);
                    312:        iphlen = va_arg(ap, int);
1.97      simonb    313:        (void)va_arg(ap, int);          /* ignore value, advance ap */
1.53      itojun    314:        va_end(ap);
                    315:
1.98      matt      316:        MCLAIM(m, &udp_rx_mowner);
1.166     thorpej   317:        UDP_STATINC(UDP_STAT_IPACKETS);
1.53      itojun    318:
                    319:        /*
                    320:         * Get IP and UDP header together in first mbuf.
                    321:         */
                    322:        ip = mtod(m, struct ip *);
                    323:        IP6_EXTHDR_GET(uh, struct udphdr *, m, iphlen, sizeof(struct udphdr));
                    324:        if (uh == NULL) {
1.166     thorpej   325:                UDP_STATINC(UDP_STAT_HDROPS);
1.53      itojun    326:                return;
                    327:        }
1.95      thorpej   328:        KASSERT(UDP_HDR_ALIGNED_P(uh));
1.53      itojun    329:
1.190.2.4! rmind     330:        /* Destination port of 0 is illegal, based on RFC 768. */
1.57      itojun    331:        if (uh->uh_dport == 0)
                    332:                goto bad;
                    333:
1.53      itojun    334:        /*
                    335:         * Make mbuf data length reflect UDP length.
                    336:         * If not enough data to reflect UDP length, drop.
                    337:         */
1.96      itojun    338:        ip_len = ntohs(ip->ip_len);
1.190.2.4! rmind     339:        len = ntohs((uint16_t)uh->uh_ulen);
1.96      itojun    340:        if (ip_len != iphlen + len) {
                    341:                if (ip_len < iphlen + len || len < sizeof(struct udphdr)) {
1.166     thorpej   342:                        UDP_STATINC(UDP_STAT_BADLEN);
1.53      itojun    343:                        goto bad;
                    344:                }
1.96      itojun    345:                m_adj(m, iphlen + len - ip_len);
1.53      itojun    346:        }
                    347:
                    348:        /*
                    349:         * Checksum extended UDP header and data.
                    350:         */
1.129     yamt      351:        if (udp4_input_checksum(m, uh, iphlen, len))
1.190.2.4! rmind     352:                goto bad;
1.53      itojun    353:
                    354:        /* construct source and dst sockaddrs. */
1.159     dyoung    355:        sockaddr_in_init(&src, &ip->ip_src, uh->uh_sport);
                    356:        sockaddr_in_init(&dst, &ip->ip_dst, uh->uh_dport);
1.53      itojun    357:
1.144     manu      358:        if ((n = udp4_realinput(&src, &dst, &m, iphlen)) == -1) {
1.166     thorpej   359:                UDP_STATINC(UDP_STAT_HDROPS);
1.144     manu      360:                return;
                    361:        }
1.188     christos  362:        if (m == NULL) {
                    363:                /*
                    364:                 * packet has been processed by ESP stuff -
                    365:                 * e.g. dropped NAT-T-keep-alive-packet ...
                    366:                 */
                    367:                return;
                    368:        }
                    369:        ip = mtod(m, struct ip *);
1.53      itojun    370: #ifdef INET6
                    371:        if (IN_MULTICAST(ip->ip_dst.s_addr) || n == 0) {
                    372:                struct sockaddr_in6 src6, dst6;
                    373:
1.175     cegger    374:                memset(&src6, 0, sizeof(src6));
1.53      itojun    375:                src6.sin6_family = AF_INET6;
                    376:                src6.sin6_len = sizeof(struct sockaddr_in6);
                    377:                src6.sin6_addr.s6_addr[10] = src6.sin6_addr.s6_addr[11] = 0xff;
1.177     tsutsui   378:                memcpy(&src6.sin6_addr.s6_addr[12], &ip->ip_src,
1.53      itojun    379:                        sizeof(ip->ip_src));
                    380:                src6.sin6_port = uh->uh_sport;
1.175     cegger    381:                memset(&dst6, 0, sizeof(dst6));
1.53      itojun    382:                dst6.sin6_family = AF_INET6;
                    383:                dst6.sin6_len = sizeof(struct sockaddr_in6);
                    384:                dst6.sin6_addr.s6_addr[10] = dst6.sin6_addr.s6_addr[11] = 0xff;
1.177     tsutsui   385:                memcpy(&dst6.sin6_addr.s6_addr[12], &ip->ip_dst,
1.53      itojun    386:                        sizeof(ip->ip_dst));
                    387:                dst6.sin6_port = uh->uh_dport;
                    388:
                    389:                n += udp6_realinput(AF_INET, &src6, &dst6, m, iphlen);
                    390:        }
                    391: #endif
                    392:
                    393:        if (n == 0) {
                    394:                if (m->m_flags & (M_BCAST | M_MCAST)) {
1.166     thorpej   395:                        UDP_STATINC(UDP_STAT_NOPORTBCAST);
1.53      itojun    396:                        goto bad;
                    397:                }
1.166     thorpej   398:                UDP_STATINC(UDP_STAT_NOPORT);
1.64      ws        399: #ifdef IPKDB
1.53      itojun    400:                if (checkipkdb(&ip->ip_src, uh->uh_sport, uh->uh_dport,
                    401:                                m, iphlen + sizeof(struct udphdr),
                    402:                                m->m_pkthdr.len - iphlen - sizeof(struct udphdr))) {
                    403:                        /*
                    404:                         * It was a debugger connect packet,
                    405:                         * just drop it now
                    406:                         */
                    407:                        goto bad;
                    408:                }
                    409: #endif
                    410:                icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0);
                    411:                m = NULL;
                    412:        }
                    413: bad:
1.190.2.4! rmind     414:        if (m) {
1.53      itojun    415:                m_freem(m);
1.190.2.4! rmind     416:        }
1.78      thorpej   417:        return;
1.53      itojun    418: }
                    419:
                    420: static void
1.119     matt      421: udp4_sendup(struct mbuf *m, int off /* offset of data portion */,
                    422:        struct sockaddr *src, struct socket *so)
1.53      itojun    423: {
                    424:        struct mbuf *opts = NULL;
                    425:        struct mbuf *n;
1.190.2.1  rmind     426:        inpcb_t *inp = NULL;
1.53      itojun    427:
                    428:        if (!so)
                    429:                return;
                    430:        switch (so->so_proto->pr_domain->dom_family) {
                    431:        case AF_INET:
                    432:                inp = sotoinpcb(so);
                    433:                break;
                    434: #ifdef INET6
                    435:        case AF_INET6:
                    436:                break;
                    437: #endif
                    438:        default:
                    439:                return;
                    440:        }
                    441:
1.190     christos  442: #if defined(IPSEC)
1.53      itojun    443:        /* check AH/ESP integrity. */
                    444:        if (so != NULL && ipsec4_in_reject_so(m, so)) {
1.169     thorpej   445:                IPSEC_STATINC(IPSEC_STAT_IN_POLVIO);
1.162     dyoung    446:                if ((n = m_copypacket(m, M_DONTWAIT)) != NULL)
1.110     itojun    447:                        icmp_error(n, ICMP_UNREACH, ICMP_UNREACH_ADMIN_PROHIBIT,
                    448:                            0, 0);
1.53      itojun    449:                return;
                    450:        }
                    451: #endif /*IPSEC*/
                    452:
1.162     dyoung    453:        if ((n = m_copypacket(m, M_DONTWAIT)) != NULL) {
1.190.2.1  rmind     454:                if (inp && ((inpcb_get_flags(inp) & INP_CONTROLOPTS) != 0
1.174     christos  455: #ifdef SO_OTIMESTAMP
                    456:                         || so->so_options & SO_OTIMESTAMP
                    457: #endif
1.53      itojun    458:                         || so->so_options & SO_TIMESTAMP)) {
                    459:                        struct ip *ip = mtod(n, struct ip *);
                    460:                        ip_savecontrol(inp, &opts, ip, n);
                    461:                }
                    462:
                    463:                m_adj(n, off);
                    464:                if (sbappendaddr(&so->so_rcv, src, n,
                    465:                                opts) == 0) {
                    466:                        m_freem(n);
                    467:                        if (opts)
                    468:                                m_freem(opts);
1.124     darrenr   469:                        so->so_rcv.sb_overflowed++;
1.166     thorpej   470:                        UDP_STATINC(UDP_STAT_FULLSOCK);
1.53      itojun    471:                } else
                    472:                        sorwakeup(so);
                    473:        }
                    474: }
                    475:
1.190.2.1  rmind     476: struct udp_pcb_ctx {
                    477:        struct mbuf *           mbuf;
                    478:        struct sockaddr_in *    src;
                    479:        struct sockaddr_in *    dst;
                    480:        int                     off;
                    481:        int                     rcvcnt;
                    482: };
1.53      itojun    483:
1.190.2.1  rmind     484: static int
                    485: udp4_pcb_process(inpcb_t *inp, void *arg)
                    486: {
                    487:        struct udp_pcb_ctx *uctx = arg;
                    488:        struct in_addr dst4 = uctx->dst->sin_addr;
                    489:        in_port_t dport = uctx->dst->sin_port;
                    490:        struct in_addr laddr, faddr;
                    491:        in_port_t lport, fport;
                    492:        struct socket *so;
1.53      itojun    493:
1.190.2.1  rmind     494:        inpcb_get_ports(inp, &lport, &fport);
                    495:        if (lport != dport) {
                    496:                return 0;
1.53      itojun    497:        }
1.190.2.1  rmind     498:        inpcb_get_addrs(inp, &laddr, &faddr);
                    499:        if (!in_nullhost(laddr) && !in_hosteq(laddr, dst4)) {
                    500:                return 0;
                    501:        }
                    502:        if (!in_nullhost(faddr)) {
                    503:                struct in_addr src4 = uctx->src->sin_addr;
                    504:                in_port_t sport = uctx->src->sin_port;
1.53      itojun    505:
1.190.2.1  rmind     506:                if (!in_hosteq(faddr, src4) || fport != sport) {
                    507:                        return 0;
1.53      itojun    508:                }
1.190.2.1  rmind     509:        }
1.53      itojun    510:
1.190.2.1  rmind     511:        so = inpcb_get_socket(inp);
                    512:        udp4_sendup(uctx->mbuf, uctx->off, (struct sockaddr *)uctx->src, so);
                    513:        uctx->rcvcnt++;
                    514:
                    515:        /*
                    516:         * Do not look for additional matches if this one does not have
                    517:         * either the SO_REUSEPORT or SO_REUSEADDR socket options set.
                    518:         * This heuristic avoids searching through all PCBs in the common
                    519:         * case of a non-shared port.  It assumes that an application will
                    520:         * never clear these options after setting them.
                    521:         */
                    522:        if ((so->so_options & (SO_REUSEPORT|SO_REUSEADDR)) == 0) {
                    523:                return EJUSTRETURN;
1.53      itojun    524:        }
1.190.2.1  rmind     525:        return 0;
1.53      itojun    526: }
                    527:
                    528: static int
1.119     matt      529: udp4_realinput(struct sockaddr_in *src, struct sockaddr_in *dst,
1.190.2.1  rmind     530:     struct mbuf **mp, int off /* offset of udphdr */)
1.53      itojun    531: {
1.190.2.1  rmind     532:        in_port_t *sport, *dport;
1.53      itojun    533:        struct in_addr *src4, *dst4;
1.190.2.1  rmind     534:        inpcb_t *inp;
1.144     manu      535:        struct mbuf *m = *mp;
1.190.2.1  rmind     536:        int rcvcnt;
1.53      itojun    537:
                    538:        rcvcnt = 0;
                    539:        off += sizeof(struct udphdr);   /* now, offset of payload */
                    540:
                    541:        if (src->sin_family != AF_INET || dst->sin_family != AF_INET)
                    542:                goto bad;
                    543:
                    544:        src4 = &src->sin_addr;
                    545:        sport = &src->sin_port;
                    546:        dst4 = &dst->sin_addr;
                    547:        dport = &dst->sin_port;
                    548:
1.73      itojun    549:        if (IN_MULTICAST(dst4->s_addr) ||
1.53      itojun    550:            in_broadcast(*dst4, m->m_pkthdr.rcvif)) {
1.190.2.1  rmind     551:                struct udp_pcb_ctx uctx = {
                    552:                        .mbuf = m, .src = src, .dst = dst,
                    553:                        .off = off, .rcvcnt = 0
                    554:                };
                    555:                int error;
                    556:
1.53      itojun    557:                /*
                    558:                 * Deliver a multicast or broadcast datagram to *all* sockets
                    559:                 * for which the local and remote addresses and ports match
                    560:                 * those of the incoming datagram.  This allows more than
                    561:                 * one process to receive multi/broadcasts on the same port.
                    562:                 */
1.190.2.1  rmind     563:                error = inpcb_foreach(udbtable, AF_INET,
                    564:                    udp4_pcb_process, &uctx);
                    565:                KASSERT(error == 0 || error == EJUSTRETURN);
                    566:                rcvcnt = uctx.rcvcnt;
1.53      itojun    567:        } else {
                    568:                /*
1.190.2.1  rmind     569:                 * Locate PCB for datagram.
1.53      itojun    570:                 */
1.190.2.1  rmind     571:                struct socket *so;
                    572:
1.190.2.3  rmind     573:                inp = inpcb_lookup(udbtable, *src4, *sport, *dst4, *dport, NULL);
1.190.2.1  rmind     574:                if (inp == NULL) {
1.166     thorpej   575:                        UDP_STATINC(UDP_STAT_PCBHASHMISS);
1.190.2.3  rmind     576:                        inp = inpcb_lookup_bound(udbtable, *dst4, *dport);
1.190.2.1  rmind     577:                        if (inp == NULL)
1.53      itojun    578:                                return rcvcnt;
                    579:                }
1.190.2.1  rmind     580:                so = inpcb_get_socket(inp);
1.53      itojun    581:
1.190     christos  582: #ifdef IPSEC
1.130     manu      583:                /* Handle ESP over UDP */
1.190.2.1  rmind     584:                if (inpcb_get_flags(inp) & INP_ESPINUDP_ALL) {
1.130     manu      585:                        struct sockaddr *sa = (struct sockaddr *)src;
                    586:
1.190.2.1  rmind     587:                        switch (udp4_espinudp(mp, off, sa, so)) {
1.144     manu      588:                        case -1:        /* Error, m was freeed */
                    589:                                rcvcnt = -1;
                    590:                                goto bad;
                    591:                                break;
                    592:
                    593:                        case 1:         /* ESP over UDP */
1.130     manu      594:                                rcvcnt++;
                    595:                                goto bad;
1.144     manu      596:                                break;
                    597:
                    598:                        case 0:         /* plain UDP */
                    599:                        default:        /* Unexpected */
                    600:                                /*
                    601:                                 * Normal UDP processing will take place
                    602:                                 * m may have changed.
                    603:                                 */
                    604:                                m = *mp;
                    605:                                break;
1.130     manu      606:                        }
                    607:                }
1.189     christos  608: #endif
1.130     manu      609:
1.178     minskim   610:                /*
                    611:                 * Check the minimum TTL for socket.
                    612:                 */
1.190.2.1  rmind     613:                if (mtod(m, struct ip *)->ip_ttl < inpcb_get_minttl(inp)) {
1.178     minskim   614:                        goto bad;
1.53      itojun    615:                }
1.190.2.1  rmind     616:                udp4_sendup(m, off, (struct sockaddr *)src, so);
1.53      itojun    617:                rcvcnt++;
                    618:        }
                    619:
                    620: bad:
                    621:        return rcvcnt;
                    622: }
                    623: #endif
1.1       cgd       624:
1.72      itojun    625: #ifdef INET
1.1       cgd       626: /*
1.190.2.1  rmind     627:  * Notify a UDP user of an asynchronous error;
1.1       cgd       628:  * just wake up so that he can collect error status.
                    629:  */
1.7       mycroft   630: static void
1.190.2.1  rmind     631: udp_notify(inpcb_t *inp, int errno)
1.1       cgd       632: {
1.190.2.1  rmind     633:        struct socket *so = inpcb_get_socket(inp);
                    634:
                    635:        so->so_error = errno;
                    636:        sorwakeup(so);
                    637:        sowwakeup(so);
1.1       cgd       638: }
                    639:
1.27      christos  640: void *
1.157     dyoung    641: udp_ctlinput(int cmd, const struct sockaddr *sa, void *v)
1.1       cgd       642: {
1.66      augustss  643:        struct ip *ip = v;
                    644:        struct udphdr *uh;
1.21      mycroft   645:        int errno;
1.190.2.1  rmind     646:        bool rdr;
1.1       cgd       647:
1.190.2.1  rmind     648:        if (sa->sa_family != AF_INET ||
                    649:            sa->sa_len != sizeof(struct sockaddr_in))
1.51      itojun    650:                return NULL;
1.20      mycroft   651:        if ((unsigned)cmd >= PRC_NCMDS)
1.27      christos  652:                return NULL;
1.20      mycroft   653:        errno = inetctlerrmap[cmd];
1.190.2.1  rmind     654:
                    655:        rdr = PRC_IS_REDIRECT(cmd);
                    656:        if (rdr || cmd == PRC_HOSTDEAD || ip == NULL) {
                    657:                inpcb_notifyall(udbtable, satocsin(sa)->sin_addr,
                    658:                    errno, rdr ? inpcb_rtchange : udp_notify);
1.27      christos  659:                return NULL;
1.190.2.1  rmind     660:        } else if (errno == 0) {
                    661:                return NULL;
                    662:        }
1.53      itojun    663:
1.190.2.1  rmind     664:        /* Note: mapped address case */
                    665:        uh = (struct udphdr *)((char *)ip + (ip->ip_hl << 2));
                    666:        inpcb_notify(udbtable, satocsin(sa)->sin_addr, uh->uh_dport,
                    667:            ip->ip_src, uh->uh_sport, errno, udp_notify);
1.27      christos  668:        return NULL;
1.1       cgd       669: }
                    670:
1.7       mycroft   671: int
1.173     plunky    672: udp_ctloutput(int op, struct socket *so, struct sockopt *sopt)
1.130     manu      673: {
1.190.2.4! rmind     674:        int family, optval, inpflags, error = 0;
1.190.2.1  rmind     675:        inpcb_t *inp;
1.130     manu      676:
1.190.2.4! rmind     677:        KASSERT(solocked(so));
        !           678:
1.130     manu      679:        family = so->so_proto->pr_domain->dom_family;
                    680:
                    681:        switch (family) {
                    682: #ifdef INET
                    683:        case PF_INET:
1.173     plunky    684:                if (sopt->sopt_level != IPPROTO_UDP) {
1.190.2.4! rmind     685:                        return ip_ctloutput(op, so, sopt);
1.130     manu      686:                }
                    687:                break;
                    688: #endif
                    689: #ifdef INET6
                    690:        case PF_INET6:
1.173     plunky    691:                if (sopt->sopt_level != IPPROTO_UDP) {
1.190.2.4! rmind     692:                        return ip6_ctloutput(op, so, sopt);
1.130     manu      693:                }
                    694:                break;
                    695: #endif
                    696:        default:
1.190.2.4! rmind     697:                return EAFNOSUPPORT;
1.130     manu      698:        }
                    699:
                    700:        switch (op) {
                    701:        case PRCO_SETOPT:
                    702:                inp = sotoinpcb(so);
                    703:
1.173     plunky    704:                switch (sopt->sopt_name) {
1.130     manu      705:                case UDP_ENCAP:
1.173     plunky    706:                        error = sockopt_getint(sopt, &optval);
                    707:                        if (error)
1.153     yamt      708:                                break;
1.131     perry     709:
1.190.2.1  rmind     710:                        inpflags = inpcb_get_flags(inp);
1.173     plunky    711:                        switch(optval) {
1.130     manu      712:                        case 0:
1.190.2.1  rmind     713:                                inpflags &= ~INP_ESPINUDP_ALL;
1.130     manu      714:                                break;
                    715:
                    716:                        case UDP_ENCAP_ESPINUDP:
1.190.2.1  rmind     717:                                inpflags &= ~INP_ESPINUDP_ALL;
                    718:                                inpflags |= INP_ESPINUDP;
1.130     manu      719:                                break;
1.131     perry     720:
1.130     manu      721:                        case UDP_ENCAP_ESPINUDP_NON_IKE:
1.190.2.1  rmind     722:                                inpflags &= ~INP_ESPINUDP_ALL;
                    723:                                inpflags |= INP_ESPINUDP_NON_IKE;
1.130     manu      724:                                break;
                    725:                        default:
                    726:                                error = EINVAL;
                    727:                                break;
                    728:                        }
1.190.2.1  rmind     729:                        inpcb_set_flags(inp, inpflags);
1.130     manu      730:                        break;
1.190.2.1  rmind     731:
1.130     manu      732:                default:
                    733:                        error = ENOPROTOOPT;
                    734:                        break;
                    735:                }
                    736:                break;
                    737:
                    738:        default:
                    739:                error = EINVAL;
                    740:                break;
1.131     perry     741:        }
                    742:
1.130     manu      743:        return error;
                    744: }
1.131     perry     745:
1.190.2.3  rmind     746: static int
                    747: udp_output(struct mbuf *m, inpcb_t *inp)
1.27      christos  748: {
1.190.2.1  rmind     749:        struct socket *so;
1.66      augustss  750:        struct udpiphdr *ui;
1.125     thorpej   751:        struct route *ro;
1.66      augustss  752:        int len = m->m_pkthdr.len;
1.31      mycroft   753:        int error = 0;
1.27      christos  754:
1.98      matt      755:        MCLAIM(m, &udp_tx_mowner);
1.190.2.1  rmind     756:        so = inpcb_get_socket(inp);
                    757:        KASSERT(solocked(so));
                    758:
1.1       cgd       759:        /*
1.190.2.3  rmind     760:         * Calculate data length and get a mbuf for UDP and IP headers.
1.1       cgd       761:         */
1.13      mycroft   762:        M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT);
1.190.2.3  rmind     763:        if (m == NULL) {
1.13      mycroft   764:                error = ENOBUFS;
1.39      thorpej   765:                goto release;
                    766:        }
                    767:
                    768:        /*
                    769:         * Compute the packet length of the IP header, and
                    770:         * punt if the length looks bogus.
                    771:         */
1.96      itojun    772:        if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) {
1.39      thorpej   773:                error = EMSGSIZE;
1.13      mycroft   774:                goto release;
                    775:        }
1.1       cgd       776:
                    777:        /*
1.190.2.3  rmind     778:         * Fill in mbuf with extended UDP header.
1.1       cgd       779:         */
                    780:        ui = mtod(m, struct udpiphdr *);
                    781:        ui->ui_pr = IPPROTO_UDP;
1.190.2.1  rmind     782:        inpcb_get_addrs(inp, &ui->ui_src, &ui->ui_dst);
                    783:        inpcb_get_ports(inp, &ui->ui_sport, &ui->ui_dport);
1.190.2.3  rmind     784:        ui->ui_ulen = htons((uint16_t)len + sizeof(struct udphdr));
1.1       cgd       785:
                    786:        /*
1.78      thorpej   787:         * Set up checksum and output datagram.
1.1       cgd       788:         */
                    789:        if (udpcksum) {
1.78      thorpej   790:                /*
                    791:                 * XXX Cache pseudo-header checksum part for
                    792:                 * XXX "connected" UDP sockets.
                    793:                 */
                    794:                ui->ui_sum = in_cksum_phdr(ui->ui_src.s_addr,
                    795:                    ui->ui_dst.s_addr, htons((u_int16_t)len +
                    796:                    sizeof(struct udphdr) + IPPROTO_UDP));
1.135     yamt      797:                m->m_pkthdr.csum_flags = M_CSUM_UDPv4;
1.78      thorpej   798:                m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
                    799:        } else
                    800:                ui->ui_sum = 0;
1.190.2.1  rmind     801:
1.190.2.3  rmind     802:        struct ip *ui_ip = (struct ip *)ui;
                    803:        ui_ip->ip_len = htons(sizeof (struct udpiphdr) + len);
1.190.2.1  rmind     804:
                    805:        struct ip *inp_ip = in_getiphdr(inp);
1.190.2.3  rmind     806:        ui_ip->ip_ttl = inp_ip->ip_ttl; /* XXX */
                    807:        ui_ip->ip_tos = inp_ip->ip_tos; /* XXX */
1.166     thorpej   808:        UDP_STATINC(UDP_STAT_OPACKETS);
1.48      itojun    809:
1.190.2.4! rmind     810:        ro = inpcb_get_route(inp);
        !           811:        return ip_output(m, inpcb_get_options(inp), ro,
1.190.2.1  rmind     812:            so->so_options & (SO_DONTROUTE | SO_BROADCAST),
1.190.2.4! rmind     813:            inpcb_get_moptions(inp), so);
1.1       cgd       814:
                    815: release:
                    816:        m_freem(m);
1.190.2.1  rmind     817:        return error;
1.1       cgd       818: }
                    819:
1.190.2.2  rmind     820: static int
                    821: udp_attach(struct socket *so, int proto)
                    822: {
                    823:        inpcb_t *inp;
                    824:        struct ip *ip;
1.190.2.4! rmind     825:        int error;
1.190.2.2  rmind     826:
                    827:        KASSERT(sotoinpcb(so) == NULL);
                    828:
1.190.2.4! rmind     829:        /* Assign the lock (must happen if we will error out). */
1.190.2.2  rmind     830:        sosetlock(so);
                    831:
                    832: #ifdef MBUFTRACE
                    833:        so->so_mowner = &udp_mowner;
                    834:        so->so_rcv.sb_mowner = &udp_rx_mowner;
                    835:        so->so_snd.sb_mowner = &udp_tx_mowner;
                    836: #endif
                    837:        if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
                    838:                error = soreserve(so, udp_sendspace, udp_recvspace);
                    839:                if (error) {
1.190.2.4! rmind     840:                        return error;
1.190.2.2  rmind     841:                }
                    842:        }
                    843:
                    844:        error = inpcb_create(so, udbtable);
                    845:        if (error) {
1.190.2.4! rmind     846:                return error;
1.190.2.2  rmind     847:        }
                    848:        inp = sotoinpcb(so);
                    849:        ip = in_getiphdr(inp);
                    850:        ip->ip_ttl = ip_defttl;
                    851:        return error;
                    852: }
                    853:
                    854: static void
                    855: udp_detach(struct socket *so)
                    856: {
                    857:        inpcb_t *inp;
                    858:
                    859:        KASSERT(solocked(so));
                    860:        inp = sotoinpcb(so);
                    861:        KASSERT(inp != NULL);
                    862:        inpcb_destroy(inp);
                    863: }
                    864:
                    865: static int
1.190.2.3  rmind     866: udp_send(struct socket *so, struct mbuf *m, struct mbuf *nam,
                    867:     struct mbuf *control)
                    868: {
                    869:        inpcb_t *inp;
                    870:        struct in_addr laddr;
                    871:        int error;
                    872:
                    873:        KASSERT(solocked(so));
                    874:        inp = sotoinpcb(so);
                    875:
                    876:        if (control && control->m_len) {
                    877:                m_freem(control);
                    878:                m_freem(m);
                    879:                return EINVAL;
                    880:        }
                    881:
                    882:        if ((so->so_state & SS_ISCONNECTED) != 0) {
                    883:                m_freem(m);
                    884:                return nam ? EISCONN : ENOTCONN;
                    885:        }
                    886:
                    887:        if (nam) {
                    888:                /*
                    889:                 * XXX: sendto() case - temporarily connect the socket
                    890:                 * to the destination, send and then disconnect.  Also,
                    891:                 * preserve the local address as it may be changed.
                    892:                 */
                    893:                inpcb_get_addrs(inp, &laddr, NULL);
                    894:                if ((error = inpcb_connect(inp, nam, curlwp)) != 0) {
                    895:                        m_freem(m);
                    896:                        return error;
                    897:                }
                    898:        }
                    899:        error = udp_output(m, inp);
                    900:        if (nam) {
                    901:                inpcb_disconnect(inp);
                    902:                inpcb_set_addrs(inp, &laddr, NULL);
                    903:                inpcb_set_state(inp, INP_BOUND);
                    904:        }
                    905:        return error;
                    906: }
                    907:
                    908: static int
1.119     matt      909: udp_usrreq(struct socket *so, int req, struct mbuf *m, struct mbuf *nam,
1.190.2.1  rmind     910:     struct mbuf *control, struct lwp *l)
1.1       cgd       911: {
1.190.2.1  rmind     912:        inpcb_t *inp;
1.190.2.4! rmind     913:        int error = 0;
1.59      thorpej   914:
1.190.2.2  rmind     915:        KASSERT(req != PRU_ATTACH);
                    916:        KASSERT(req != PRU_DETACH);
                    917:
1.190.2.1  rmind     918:        if (req == PRU_CONTROL) {
1.190.2.4! rmind     919:                KERNEL_LOCK(1, NULL);
        !           920:                error = in_control(so, (long)m, nam, (ifnet_t *)control, l);
        !           921:                KERNEL_UNLOCK_ONE(NULL);
        !           922:                return error;
1.190.2.1  rmind     923:        }
1.60      thorpej   924:        if (req == PRU_PURGEIF) {
1.190.2.4! rmind     925:                KERNEL_LOCK(1, NULL);
1.170     ad        926:                mutex_enter(softnet_lock);
1.190.2.1  rmind     927:                inpcb_purgeif0(udbtable, (ifnet_t *)control);
                    928:                in_purgeif((ifnet_t *)control);
                    929:                inpcb_purgeif(udbtable, (ifnet_t *)control);
1.170     ad        930:                mutex_exit(softnet_lock);
1.190.2.4! rmind     931:                KERNEL_UNLOCK_ONE(NULL);
        !           932:                return 0;
1.59      thorpej   933:        }
1.31      mycroft   934:
1.190.2.2  rmind     935:        KASSERT(solocked(so));
1.31      mycroft   936:        inp = sotoinpcb(so);
1.190.2.1  rmind     937:
                    938:        KASSERT(!control || (req == PRU_SEND || req == PRU_SENDOOB));
1.190.2.2  rmind     939:        if (inp == NULL) {
1.190.2.4! rmind     940:                return EINVAL;
1.31      mycroft   941:        }
                    942:
1.1       cgd       943:        switch (req) {
                    944:        case PRU_BIND:
1.190.2.1  rmind     945:                error = inpcb_bind(inp, nam, l);
1.1       cgd       946:                break;
                    947:
                    948:        case PRU_LISTEN:
                    949:                error = EOPNOTSUPP;
                    950:                break;
                    951:
                    952:        case PRU_CONNECT:
1.190.2.1  rmind     953:                error = inpcb_connect(inp, nam, l);
1.31      mycroft   954:                if (error)
1.1       cgd       955:                        break;
1.31      mycroft   956:                soisconnected(so);
1.1       cgd       957:                break;
                    958:
                    959:        case PRU_CONNECT2:
                    960:                error = EOPNOTSUPP;
                    961:                break;
                    962:
                    963:        case PRU_DISCONNECT:
1.31      mycroft   964:                /*soisdisconnected(so);*/
1.190.2.1  rmind     965:                so->so_state &= ~SS_ISCONNECTED;                /* XXX */
                    966:                inpcb_disconnect(inp);
1.1       cgd       967:                break;
                    968:
                    969:        case PRU_SHUTDOWN:
                    970:                socantsendmore(so);
                    971:                break;
                    972:
1.31      mycroft   973:        case PRU_RCVD:
                    974:                error = EOPNOTSUPP;
1.1       cgd       975:                break;
                    976:
1.31      mycroft   977:        case PRU_SEND:
1.190.2.3  rmind     978:                error = udp_send(so, m, nam, control);
1.1       cgd       979:                break;
                    980:
                    981:        case PRU_SENSE:
                    982:                /*
                    983:                 * stat: don't bother with a blocksize.
                    984:                 */
1.190.2.4! rmind     985:                return 0;
1.1       cgd       986:
1.31      mycroft   987:        case PRU_RCVOOB:
                    988:                error =  EOPNOTSUPP;
                    989:                break;
                    990:
1.1       cgd       991:        case PRU_SENDOOB:
1.32      mycroft   992:                m_freem(control);
1.31      mycroft   993:                m_freem(m);
1.1       cgd       994:                error =  EOPNOTSUPP;
                    995:                break;
                    996:
1.31      mycroft   997:        case PRU_SOCKADDR:
1.190.2.1  rmind     998:                inpcb_fetch_sockaddr(inp, nam);
1.31      mycroft   999:                break;
                   1000:
                   1001:        case PRU_PEERADDR:
1.190.2.1  rmind    1002:                inpcb_fetch_peeraddr(inp, nam);
1.31      mycroft  1003:                break;
1.1       cgd      1004:
                   1005:        default:
                   1006:                panic("udp_usrreq");
                   1007:        }
                   1008:
1.190.2.4! rmind    1009:        return error;
1.13      mycroft  1010: }
                   1011:
1.166     thorpej  1012: static int
                   1013: sysctl_net_inet_udp_stats(SYSCTLFN_ARGS)
                   1014: {
                   1015:
1.172     thorpej  1016:        return (NETSTAT_SYSCTL(udpstat_percpu, UDP_NSTATS));
1.166     thorpej  1017: }
                   1018:
1.13      mycroft  1019: /*
                   1020:  * Sysctl for udp variables.
                   1021:  */
1.179     pooka    1022: static void
                   1023: sysctl_net_inet_udp_setup(struct sysctllog **clog)
1.13      mycroft  1024: {
1.116     atatat   1025:        sysctl_createv(clog, 0, NULL, NULL,
                   1026:                       CTLFLAG_PERMANENT,
1.114     atatat   1027:                       CTLTYPE_NODE, "net", NULL,
                   1028:                       NULL, 0, NULL, 0,
                   1029:                       CTL_NET, CTL_EOL);
1.116     atatat   1030:        sysctl_createv(clog, 0, NULL, NULL,
                   1031:                       CTLFLAG_PERMANENT,
1.114     atatat   1032:                       CTLTYPE_NODE, "inet", NULL,
                   1033:                       NULL, 0, NULL, 0,
                   1034:                       CTL_NET, PF_INET, CTL_EOL);
1.116     atatat   1035:        sysctl_createv(clog, 0, NULL, NULL,
                   1036:                       CTLFLAG_PERMANENT,
1.122     atatat   1037:                       CTLTYPE_NODE, "udp",
                   1038:                       SYSCTL_DESCR("UDPv4 related settings"),
1.114     atatat   1039:                       NULL, 0, NULL, 0,
                   1040:                       CTL_NET, PF_INET, IPPROTO_UDP, CTL_EOL);
                   1041:
1.116     atatat   1042:        sysctl_createv(clog, 0, NULL, NULL,
                   1043:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.122     atatat   1044:                       CTLTYPE_INT, "checksum",
1.123     heas     1045:                       SYSCTL_DESCR("Compute UDP checksums"),
1.114     atatat   1046:                       NULL, 0, &udpcksum, 0,
                   1047:                       CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_CHECKSUM,
                   1048:                       CTL_EOL);
1.116     atatat   1049:        sysctl_createv(clog, 0, NULL, NULL,
                   1050:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.122     atatat   1051:                       CTLTYPE_INT, "sendspace",
                   1052:                       SYSCTL_DESCR("Default UDP send buffer size"),
1.114     atatat   1053:                       NULL, 0, &udp_sendspace, 0,
                   1054:                       CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_SENDSPACE,
                   1055:                       CTL_EOL);
1.116     atatat   1056:        sysctl_createv(clog, 0, NULL, NULL,
                   1057:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.122     atatat   1058:                       CTLTYPE_INT, "recvspace",
                   1059:                       SYSCTL_DESCR("Default UDP receive buffer size"),
1.114     atatat   1060:                       NULL, 0, &udp_recvspace, 0,
                   1061:                       CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_RECVSPACE,
                   1062:                       CTL_EOL);
1.125     thorpej  1063:        sysctl_createv(clog, 0, NULL, NULL,
                   1064:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1065:                       CTLTYPE_INT, "do_loopback_cksum",
                   1066:                       SYSCTL_DESCR("Perform UDP checksum on loopback"),
                   1067:                       NULL, 0, &udp_do_loopback_cksum, 0,
                   1068:                       CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_LOOPBACKCKSUM,
                   1069:                       CTL_EOL);
1.132     atatat   1070:        sysctl_createv(clog, 0, NULL, NULL,
                   1071:                       CTLFLAG_PERMANENT,
1.134     atatat   1072:                       CTLTYPE_STRUCT, "pcblist",
1.132     atatat   1073:                       SYSCTL_DESCR("UDP protocol control block list"),
1.190.2.1  rmind    1074:                       sysctl_inpcblist, 0, udbtable, 0,
1.132     atatat   1075:                       CTL_NET, PF_INET, IPPROTO_UDP, CTL_CREATE,
                   1076:                       CTL_EOL);
1.139     elad     1077:        sysctl_createv(clog, 0, NULL, NULL,
                   1078:                       CTLFLAG_PERMANENT,
                   1079:                       CTLTYPE_STRUCT, "stats",
                   1080:                       SYSCTL_DESCR("UDP statistics"),
1.166     thorpej  1081:                       sysctl_net_inet_udp_stats, 0, NULL, 0,
1.139     elad     1082:                       CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_STATS,
                   1083:                       CTL_EOL);
1.1       cgd      1084: }
1.72      itojun   1085: #endif
1.130     manu     1086:
1.166     thorpej  1087: void
                   1088: udp_statinc(u_int stat)
                   1089: {
                   1090:
                   1091:        KASSERT(stat < UDP_NSTATS);
                   1092:        UDP_STATINC(stat);
                   1093: }
                   1094:
1.190     christos 1095: #if defined(INET) && defined(IPSEC)
1.130     manu     1096: /*
                   1097:  * Returns:
                   1098:  * 1 if the packet was processed
                   1099:  * 0 if normal UDP processing should take place
1.144     manu     1100:  * -1 if an error occurent and m was freed
1.130     manu     1101:  */
                   1102: static int
1.154     yamt     1103: udp4_espinudp(struct mbuf **mp, int off, struct sockaddr *src,
1.151     christos 1104:     struct socket *so)
1.130     manu     1105: {
                   1106:        size_t len;
1.158     christos 1107:        void *data;
1.190.2.1  rmind    1108:        inpcb_t *inp;
1.130     manu     1109:        size_t skip = 0;
                   1110:        size_t minlen;
                   1111:        size_t iphdrlen;
                   1112:        struct ip *ip;
1.136     manu     1113:        struct m_tag *tag;
                   1114:        struct udphdr *udphdr;
1.190.2.1  rmind    1115:        in_port_t sport, dport;
1.144     manu     1116:        struct mbuf *m = *mp;
1.190.2.1  rmind    1117:        int inpflags;
1.130     manu     1118:
1.131     perry    1119:        /*
1.130     manu     1120:         * Collapse the mbuf chain if the first mbuf is too short
                   1121:         * The longest case is: UDP + non ESP marker + ESP
                   1122:         */
                   1123:        minlen = off + sizeof(u_int64_t) + sizeof(struct esp);
                   1124:        if (minlen > m->m_pkthdr.len)
                   1125:                minlen = m->m_pkthdr.len;
                   1126:
                   1127:        if (m->m_len < minlen) {
1.144     manu     1128:                if ((*mp = m_pullup(m, minlen)) == NULL) {
1.130     manu     1129:                        printf("udp4_espinudp: m_pullup failed\n");
1.144     manu     1130:                        return -1;
1.130     manu     1131:                }
1.144     manu     1132:                m = *mp;
1.130     manu     1133:        }
                   1134:
1.131     perry    1135:        len = m->m_len - off;
1.158     christos 1136:        data = mtod(m, char *) + off;
1.130     manu     1137:        inp = sotoinpcb(so);
                   1138:
                   1139:        /* Ignore keepalive packets */
1.158     christos 1140:        if ((len == 1) && (*(unsigned char *)data == 0xff)) {
1.188     christos 1141:                m_free(m);
                   1142:                *mp = NULL; /* avoid any further processiong by caller ... */
1.130     manu     1143:                return 1;
                   1144:        }
1.190.2.1  rmind    1145:        inpflags = inpcb_get_flags(inp);
1.130     manu     1146:
1.131     perry    1147:        /*
                   1148:         * Check that the payload is long enough to hold
1.130     manu     1149:         * an ESP header and compute the length of encapsulation
1.131     perry    1150:         * header to remove
1.130     manu     1151:         */
1.190.2.1  rmind    1152:        if (inpflags & INP_ESPINUDP) {
1.130     manu     1153:                u_int32_t *st = (u_int32_t *)data;
                   1154:
                   1155:                if ((len <= sizeof(struct esp)) || (*st == 0))
                   1156:                        return 0; /* Normal UDP processing */
                   1157:
                   1158:                skip = sizeof(struct udphdr);
                   1159:        }
                   1160:
1.190.2.1  rmind    1161:        if (inpflags & INP_ESPINUDP_NON_IKE) {
1.142     kleink   1162:                u_int32_t *st = (u_int32_t *)data;
1.130     manu     1163:
                   1164:                if ((len <= sizeof(u_int64_t) + sizeof(struct esp))
1.142     kleink   1165:                    || ((st[0] | st[1]) != 0))
1.130     manu     1166:                        return 0; /* Normal UDP processing */
1.131     perry    1167:
1.130     manu     1168:                skip = sizeof(struct udphdr) + sizeof(u_int64_t);
                   1169:        }
                   1170:
                   1171:        /*
1.136     manu     1172:         * Get the UDP ports. They are handled in network
                   1173:         * order everywhere in IPSEC_NAT_T code.
                   1174:         */
1.158     christos 1175:        udphdr = (struct udphdr *)((char *)data - skip);
1.136     manu     1176:        sport = udphdr->uh_sport;
                   1177:        dport = udphdr->uh_dport;
                   1178:
                   1179:        /*
1.130     manu     1180:         * Remove the UDP header (and possibly the non ESP marker)
                   1181:         * IP header lendth is iphdrlen
1.131     perry    1182:         * Before:
1.130     manu     1183:         *   <--- off --->
                   1184:         *   +----+------+-----+
                   1185:         *   | IP |  UDP | ESP |
                   1186:         *   +----+------+-----+
                   1187:         *        <-skip->
                   1188:         * After:
                   1189:         *          +----+-----+
                   1190:         *          | IP | ESP |
                   1191:         *          +----+-----+
                   1192:         *   <-skip->
                   1193:         */
                   1194:        iphdrlen = off - sizeof(struct udphdr);
1.158     christos 1195:        memmove(mtod(m, char *) + skip, mtod(m, void *), iphdrlen);
1.130     manu     1196:        m_adj(m, skip);
                   1197:
                   1198:        ip = mtod(m, struct ip *);
                   1199:        ip->ip_len = htons(ntohs(ip->ip_len) - skip);
                   1200:        ip->ip_p = IPPROTO_ESP;
                   1201:
                   1202:        /*
1.188     christos 1203:         * We have modified the packet - it is now ESP, so we should not
                   1204:         * return to UDP processing ...
                   1205:         *
1.136     manu     1206:         * Add a PACKET_TAG_IPSEC_NAT_T_PORT tag to remember
                   1207:         * the source UDP port. This is required if we want
                   1208:         * to select the right SPD for multiple hosts behind
                   1209:         * same NAT
                   1210:         */
1.137     manu     1211:        if ((tag = m_tag_get(PACKET_TAG_IPSEC_NAT_T_PORTS,
                   1212:            sizeof(sport) + sizeof(dport), M_DONTWAIT)) == NULL) {
                   1213:                printf("udp4_espinudp: m_tag_get failed\n");
1.188     christos 1214:                m_freem(m);
                   1215:                return -1;
1.137     manu     1216:        }
1.136     manu     1217:        ((u_int16_t *)(tag + 1))[0] = sport;
                   1218:        ((u_int16_t *)(tag + 1))[1] = dport;
1.188     christos 1219:        m_tag_prepend(m, tag);
1.136     manu     1220:
1.190     christos 1221: #ifdef IPSEC
1.188     christos 1222:        ipsec4_common_input(m, iphdrlen, IPPROTO_ESP);
1.147     christos 1223: #else
1.188     christos 1224:        esp4_input(m, iphdrlen);
1.147     christos 1225: #endif
1.130     manu     1226:
1.185     liamjfoy 1227:        /* We handled it, it shouldn't be handled by UDP */
1.188     christos 1228:        *mp = NULL; /* avoid free by caller ... */
1.130     manu     1229:        return 1;
                   1230: }
                   1231: #endif
1.190.2.2  rmind    1232:
                   1233: const struct pr_usrreqs udp_usrreqs = {
                   1234:        .pr_attach      = udp_attach,
                   1235:        .pr_detach      = udp_detach,
                   1236:        .pr_generic     = udp_usrreq,
                   1237: };

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