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Annotation of src/sys/netinet/udp_usrreq.c, Revision 1.14

1.14    ! cgd         1: /*     $NetBSD$        */
        !             2:
1.1       cgd         3: /*
1.13      mycroft     4:  * Copyright (c) 1982, 1986, 1988, 1990, 1993
                      5:  *     The Regents of the University of California.  All rights reserved.
1.1       cgd         6:  *
                      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. All advertising materials mentioning features or use of this software
                     16:  *    must display the following acknowledgement:
                     17:  *     This product includes software developed by the University of
                     18:  *     California, Berkeley and its contributors.
                     19:  * 4. Neither the name of the University nor the names of its contributors
                     20:  *    may be used to endorse or promote products derived from this software
                     21:  *    without specific prior written permission.
                     22:  *
                     23:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     24:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     25:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     26:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     27:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     28:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     29:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     30:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     31:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     32:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     33:  * SUCH DAMAGE.
                     34:  *
1.14    ! cgd        35:  *     @(#)udp_usrreq.c        8.4 (Berkeley) 1/21/94
1.1       cgd        36:  */
                     37:
1.5       mycroft    38: #include <sys/param.h>
                     39: #include <sys/malloc.h>
                     40: #include <sys/mbuf.h>
                     41: #include <sys/protosw.h>
                     42: #include <sys/socket.h>
                     43: #include <sys/socketvar.h>
1.13      mycroft    44: #include <sys/errno.h>
1.5       mycroft    45: #include <sys/stat.h>
1.1       cgd        46:
1.5       mycroft    47: #include <net/if.h>
                     48: #include <net/route.h>
1.1       cgd        49:
1.5       mycroft    50: #include <netinet/in.h>
                     51: #include <netinet/in_systm.h>
                     52: #include <netinet/ip.h>
                     53: #include <netinet/in_pcb.h>
                     54: #include <netinet/ip_var.h>
                     55: #include <netinet/ip_icmp.h>
                     56: #include <netinet/udp.h>
                     57: #include <netinet/udp_var.h>
1.1       cgd        58:
1.8       mycroft    59: /*
                     60:  * UDP protocol implementation.
                     61:  * Per RFC 768, August, 1980.
                     62:  */
                     63: #ifndef        COMPAT_42
                     64: int    udpcksum = 1;
                     65: #else
                     66: int    udpcksum = 0;           /* XXX */
                     67: #endif
                     68:
                     69: struct sockaddr_in udp_in = { sizeof(udp_in), AF_INET };
1.1       cgd        70: struct inpcb *udp_last_inpcb = &udb;
                     71:
1.13      mycroft    72: static void udp_detach __P((struct inpcb *));
                     73: static void udp_notify __P((struct inpcb *, int));
                     74: static struct mbuf *udp_saveopt __P((caddr_t, int, int));
1.7       mycroft    75:
                     76: void
1.1       cgd        77: udp_init()
                     78: {
                     79:        udb.inp_next = udb.inp_prev = &udb;
                     80: }
                     81:
1.7       mycroft    82: void
1.1       cgd        83: udp_input(m, iphlen)
                     84:        register struct mbuf *m;
                     85:        int iphlen;
                     86: {
                     87:        register struct ip *ip;
                     88:        register struct udphdr *uh;
                     89:        register struct inpcb *inp;
                     90:        struct mbuf *opts = 0;
                     91:        int len;
                     92:        struct ip save_ip;
                     93:
                     94:        udpstat.udps_ipackets++;
                     95:
                     96:        /*
                     97:         * Strip IP options, if any; should skip this,
                     98:         * make available to user, and use on returned packets,
                     99:         * but we don't yet have a way to check the checksum
                    100:         * with options still present.
                    101:         */
                    102:        if (iphlen > sizeof (struct ip)) {
                    103:                ip_stripoptions(m, (struct mbuf *)0);
                    104:                iphlen = sizeof(struct ip);
                    105:        }
                    106:
                    107:        /*
                    108:         * Get IP and UDP header together in first mbuf.
                    109:         */
                    110:        ip = mtod(m, struct ip *);
                    111:        if (m->m_len < iphlen + sizeof(struct udphdr)) {
                    112:                if ((m = m_pullup(m, iphlen + sizeof(struct udphdr))) == 0) {
                    113:                        udpstat.udps_hdrops++;
                    114:                        return;
                    115:                }
                    116:                ip = mtod(m, struct ip *);
                    117:        }
                    118:        uh = (struct udphdr *)((caddr_t)ip + iphlen);
                    119:
                    120:        /*
                    121:         * Make mbuf data length reflect UDP length.
                    122:         * If not enough data to reflect UDP length, drop.
                    123:         */
                    124:        len = ntohs((u_short)uh->uh_ulen);
                    125:        if (ip->ip_len != len) {
                    126:                if (len > ip->ip_len) {
                    127:                        udpstat.udps_badlen++;
                    128:                        goto bad;
                    129:                }
                    130:                m_adj(m, len - ip->ip_len);
                    131:                /* ip->ip_len = len; */
                    132:        }
                    133:        /*
                    134:         * Save a copy of the IP header in case we want restore it
                    135:         * for sending an ICMP error message in response.
                    136:         */
                    137:        save_ip = *ip;
                    138:
                    139:        /*
                    140:         * Checksum extended UDP header and data.
                    141:         */
                    142:        if (udpcksum && uh->uh_sum) {
                    143:                ((struct ipovly *)ip)->ih_next = 0;
                    144:                ((struct ipovly *)ip)->ih_prev = 0;
                    145:                ((struct ipovly *)ip)->ih_x1 = 0;
                    146:                ((struct ipovly *)ip)->ih_len = uh->uh_ulen;
                    147:                if (uh->uh_sum = in_cksum(m, len + sizeof (struct ip))) {
                    148:                        udpstat.udps_badsum++;
                    149:                        m_freem(m);
                    150:                        return;
                    151:                }
                    152:        }
1.13      mycroft   153:
1.4       hpeyerl   154:        if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) ||
1.13      mycroft   155:            in_broadcast(ip->ip_dst, m->m_pkthdr.rcvif)) {
1.4       hpeyerl   156:                struct socket *last;
                    157:                /*
                    158:                 * Deliver a multicast or broadcast datagram to *all* sockets
                    159:                 * for which the local and remote addresses and ports match
                    160:                 * those of the incoming datagram.  This allows more than
                    161:                 * one process to receive multi/broadcasts on the same port.
                    162:                 * (This really ought to be done for unicast datagrams as
                    163:                 * well, but that would cause problems with existing
                    164:                 * applications that open both address-specific sockets and
                    165:                 * a wildcard socket listening to the same port -- they would
                    166:                 * end up receiving duplicates of every unicast datagram.
                    167:                 * Those applications open the multiple sockets to overcome an
                    168:                 * inadequacy of the UDP socket interface, but for backwards
                    169:                 * compatibility we avoid the problem here rather than
1.13      mycroft   170:                 * fixing the interface.  Maybe 4.5BSD will remedy this?)
1.4       hpeyerl   171:                 */
1.13      mycroft   172:
1.4       hpeyerl   173:                /*
                    174:                 * Construct sockaddr format source address.
                    175:                 */
                    176:                udp_in.sin_port = uh->uh_sport;
                    177:                udp_in.sin_addr = ip->ip_src;
                    178:                m->m_len -= sizeof (struct udpiphdr);
                    179:                m->m_data += sizeof (struct udpiphdr);
                    180:                /*
                    181:                 * Locate pcb(s) for datagram.
                    182:                 * (Algorithm copied from raw_intr().)
                    183:                 */
                    184:                last = NULL;
                    185:                for (inp = udb.inp_next; inp != &udb; inp = inp->inp_next) {
                    186:                        if (inp->inp_lport != uh->uh_dport)
                    187:                                continue;
                    188:                        if (inp->inp_laddr.s_addr != INADDR_ANY) {
                    189:                                if (inp->inp_laddr.s_addr !=
                    190:                                    ip->ip_dst.s_addr)
                    191:                                        continue;
                    192:                        }
                    193:                        if (inp->inp_faddr.s_addr != INADDR_ANY) {
1.6       mycroft   194:                                if (inp->inp_faddr.s_addr !=
1.4       hpeyerl   195:                                    ip->ip_src.s_addr ||
                    196:                                    inp->inp_fport != uh->uh_sport)
                    197:                                        continue;
                    198:                        }
                    199:
                    200:                        if (last != NULL) {
                    201:                                struct mbuf *n;
                    202:
                    203:                                if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
                    204:                                        if (sbappendaddr(&last->so_rcv,
                    205:                                                (struct sockaddr *)&udp_in,
1.13      mycroft   206:                                                n, (struct mbuf *)0) == 0) {
1.4       hpeyerl   207:                                                m_freem(n);
1.13      mycroft   208:                                                udpstat.udps_fullsock++;
                    209:                                        } else
1.4       hpeyerl   210:                                                sorwakeup(last);
                    211:                                }
                    212:                        }
                    213:                        last = inp->inp_socket;
                    214:                        /*
1.13      mycroft   215:                         * Don't look for additional matches if this one does
                    216:                         * not have either the SO_REUSEPORT or SO_REUSEADDR
                    217:                         * socket options set.  This heuristic avoids searching
                    218:                         * through all pcbs in the common case of a non-shared
                    219:                         * port.  It * assumes that an application will never
                    220:                         * clear these options after setting them.
1.4       hpeyerl   221:                         */
1.13      mycroft   222:                        if ((last->so_options&(SO_REUSEPORT|SO_REUSEADDR) == 0))
1.4       hpeyerl   223:                                break;
                    224:                }
1.6       mycroft   225:
1.4       hpeyerl   226:                if (last == NULL) {
                    227:                        /*
                    228:                         * No matching pcb found; discard datagram.
                    229:                         * (No need to send an ICMP Port Unreachable
                    230:                         * for a broadcast or multicast datgram.)
                    231:                         */
1.13      mycroft   232:                        udpstat.udps_noportbcast++;
1.4       hpeyerl   233:                        goto bad;
                    234:                }
                    235:                if (sbappendaddr(&last->so_rcv, (struct sockaddr *)&udp_in,
1.13      mycroft   236:                     m, (struct mbuf *)0) == 0) {
                    237:                        udpstat.udps_fullsock++;
1.4       hpeyerl   238:                        goto bad;
1.13      mycroft   239:                }
1.4       hpeyerl   240:                sorwakeup(last);
                    241:                return;
                    242:        }
1.1       cgd       243:        /*
                    244:         * Locate pcb for datagram.
                    245:         */
                    246:        inp = udp_last_inpcb;
                    247:        if (inp->inp_lport != uh->uh_dport ||
                    248:            inp->inp_fport != uh->uh_sport ||
                    249:            inp->inp_faddr.s_addr != ip->ip_src.s_addr ||
                    250:            inp->inp_laddr.s_addr != ip->ip_dst.s_addr) {
                    251:                inp = in_pcblookup(&udb, ip->ip_src, uh->uh_sport,
                    252:                    ip->ip_dst, uh->uh_dport, INPLOOKUP_WILDCARD);
                    253:                if (inp)
                    254:                        udp_last_inpcb = inp;
                    255:                udpstat.udpps_pcbcachemiss++;
                    256:        }
                    257:        if (inp == 0) {
                    258:                udpstat.udps_noport++;
1.13      mycroft   259:                if (m->m_flags & (M_BCAST | M_MCAST)) {
                    260:                        udpstat.udps_noportbcast++;
                    261:                        goto bad;
                    262:                }
1.1       cgd       263:                *ip = save_ip;
                    264:                ip->ip_len += iphlen;
1.13      mycroft   265:                icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0);
1.1       cgd       266:                return;
                    267:        }
                    268:
                    269:        /*
                    270:         * Construct sockaddr format source address.
                    271:         * Stuff source address and datagram in user buffer.
                    272:         */
                    273:        udp_in.sin_port = uh->uh_sport;
                    274:        udp_in.sin_addr = ip->ip_src;
                    275:        if (inp->inp_flags & INP_CONTROLOPTS) {
                    276:                struct mbuf **mp = &opts;
                    277:
                    278:                if (inp->inp_flags & INP_RECVDSTADDR) {
                    279:                        *mp = udp_saveopt((caddr_t) &ip->ip_dst,
                    280:                            sizeof(struct in_addr), IP_RECVDSTADDR);
                    281:                        if (*mp)
                    282:                                mp = &(*mp)->m_next;
                    283:                }
                    284: #ifdef notyet
                    285:                /* options were tossed above */
                    286:                if (inp->inp_flags & INP_RECVOPTS) {
                    287:                        *mp = udp_saveopt((caddr_t) opts_deleted_above,
                    288:                            sizeof(struct in_addr), IP_RECVOPTS);
                    289:                        if (*mp)
                    290:                                mp = &(*mp)->m_next;
                    291:                }
                    292:                /* ip_srcroute doesn't do what we want here, need to fix */
                    293:                if (inp->inp_flags & INP_RECVRETOPTS) {
                    294:                        *mp = udp_saveopt((caddr_t) ip_srcroute(),
                    295:                            sizeof(struct in_addr), IP_RECVRETOPTS);
                    296:                        if (*mp)
                    297:                                mp = &(*mp)->m_next;
                    298:                }
                    299: #endif
                    300:        }
                    301:        iphlen += sizeof(struct udphdr);
                    302:        m->m_len -= iphlen;
                    303:        m->m_pkthdr.len -= iphlen;
                    304:        m->m_data += iphlen;
                    305:        if (sbappendaddr(&inp->inp_socket->so_rcv, (struct sockaddr *)&udp_in,
                    306:            m, opts) == 0) {
                    307:                udpstat.udps_fullsock++;
                    308:                goto bad;
                    309:        }
                    310:        sorwakeup(inp->inp_socket);
                    311:        return;
                    312: bad:
                    313:        m_freem(m);
                    314:        if (opts)
                    315:                m_freem(opts);
                    316: }
                    317:
                    318: /*
                    319:  * Create a "control" mbuf containing the specified data
                    320:  * with the specified type for presentation with a datagram.
                    321:  */
1.13      mycroft   322: struct mbuf *
1.1       cgd       323: udp_saveopt(p, size, type)
                    324:        caddr_t p;
                    325:        register int size;
                    326:        int type;
                    327: {
                    328:        register struct cmsghdr *cp;
                    329:        struct mbuf *m;
                    330:
                    331:        if ((m = m_get(M_DONTWAIT, MT_CONTROL)) == NULL)
                    332:                return ((struct mbuf *) NULL);
                    333:        cp = (struct cmsghdr *) mtod(m, struct cmsghdr *);
1.13      mycroft   334:        bcopy(p, CMSG_DATA(cp), size);
1.1       cgd       335:        size += sizeof(*cp);
                    336:        m->m_len = size;
                    337:        cp->cmsg_len = size;
                    338:        cp->cmsg_level = IPPROTO_IP;
                    339:        cp->cmsg_type = type;
                    340:        return (m);
                    341: }
                    342:
                    343: /*
                    344:  * Notify a udp user of an asynchronous error;
                    345:  * just wake up so that he can collect error status.
                    346:  */
1.7       mycroft   347: static void
1.1       cgd       348: udp_notify(inp, errno)
                    349:        register struct inpcb *inp;
1.7       mycroft   350:        int errno;
1.1       cgd       351: {
                    352:        inp->inp_socket->so_error = errno;
                    353:        sorwakeup(inp->inp_socket);
                    354:        sowwakeup(inp->inp_socket);
                    355: }
                    356:
1.7       mycroft   357: void
1.1       cgd       358: udp_ctlinput(cmd, sa, ip)
                    359:        int cmd;
                    360:        struct sockaddr *sa;
                    361:        register struct ip *ip;
                    362: {
                    363:        register struct udphdr *uh;
                    364:        extern struct in_addr zeroin_addr;
                    365:        extern u_char inetctlerrmap[];
                    366:
1.13      mycroft   367:        if (!PRC_IS_REDIRECT(cmd) &&
                    368:            ((unsigned)cmd >= PRC_NCMDS || inetctlerrmap[cmd] == 0))
1.1       cgd       369:                return;
                    370:        if (ip) {
                    371:                uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2));
                    372:                in_pcbnotify(&udb, sa, uh->uh_dport, ip->ip_src, uh->uh_sport,
                    373:                        cmd, udp_notify);
                    374:        } else
                    375:                in_pcbnotify(&udb, sa, 0, zeroin_addr, 0, cmd, udp_notify);
                    376: }
                    377:
1.7       mycroft   378: int
1.1       cgd       379: udp_output(inp, m, addr, control)
                    380:        register struct inpcb *inp;
                    381:        register struct mbuf *m;
                    382:        struct mbuf *addr, *control;
                    383: {
                    384:        register struct udpiphdr *ui;
                    385:        register int len = m->m_pkthdr.len;
                    386:        struct in_addr laddr;
                    387:        int s, error = 0;
                    388:
                    389:        if (control)
                    390:                m_freem(control);               /* XXX */
                    391:
                    392:        if (addr) {
                    393:                laddr = inp->inp_laddr;
                    394:                if (inp->inp_faddr.s_addr != INADDR_ANY) {
                    395:                        error = EISCONN;
                    396:                        goto release;
                    397:                }
                    398:                /*
                    399:                 * Must block input while temporarily connected.
                    400:                 */
                    401:                s = splnet();
                    402:                error = in_pcbconnect(inp, addr);
                    403:                if (error) {
                    404:                        splx(s);
                    405:                        goto release;
                    406:                }
                    407:        } else {
                    408:                if (inp->inp_faddr.s_addr == INADDR_ANY) {
                    409:                        error = ENOTCONN;
                    410:                        goto release;
                    411:                }
                    412:        }
                    413:        /*
                    414:         * Calculate data length and get a mbuf
                    415:         * for UDP and IP headers.
                    416:         */
1.13      mycroft   417:        M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT);
                    418:        if (m == 0) {
                    419:                error = ENOBUFS;
                    420:                goto release;
                    421:        }
1.1       cgd       422:
                    423:        /*
                    424:         * Fill in mbuf with extended UDP header
                    425:         * and addresses and length put into network format.
                    426:         */
                    427:        ui = mtod(m, struct udpiphdr *);
                    428:        ui->ui_next = ui->ui_prev = 0;
                    429:        ui->ui_x1 = 0;
                    430:        ui->ui_pr = IPPROTO_UDP;
                    431:        ui->ui_len = htons((u_short)len + sizeof (struct udphdr));
                    432:        ui->ui_src = inp->inp_laddr;
                    433:        ui->ui_dst = inp->inp_faddr;
                    434:        ui->ui_sport = inp->inp_lport;
                    435:        ui->ui_dport = inp->inp_fport;
                    436:        ui->ui_ulen = ui->ui_len;
                    437:
                    438:        /*
                    439:         * Stuff checksum and output datagram.
                    440:         */
                    441:        ui->ui_sum = 0;
                    442:        if (udpcksum) {
                    443:            if ((ui->ui_sum = in_cksum(m, sizeof (struct udpiphdr) + len)) == 0)
                    444:                ui->ui_sum = 0xffff;
                    445:        }
                    446:        ((struct ip *)ui)->ip_len = sizeof (struct udpiphdr) + len;
                    447:        ((struct ip *)ui)->ip_ttl = inp->inp_ip.ip_ttl; /* XXX */
                    448:        ((struct ip *)ui)->ip_tos = inp->inp_ip.ip_tos; /* XXX */
                    449:        udpstat.udps_opackets++;
                    450:        error = ip_output(m, inp->inp_options, &inp->inp_route,
1.12      mycroft   451:            inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST),
                    452:            inp->inp_moptions);
1.1       cgd       453:
                    454:        if (addr) {
                    455:                in_pcbdisconnect(inp);
                    456:                inp->inp_laddr = laddr;
                    457:                splx(s);
                    458:        }
                    459:        return (error);
                    460:
                    461: release:
                    462:        m_freem(m);
                    463:        return (error);
                    464: }
                    465:
                    466: u_long udp_sendspace = 9216;           /* really max datagram size */
                    467: u_long udp_recvspace = 40 * (1024 + sizeof(struct sockaddr_in));
                    468:                                        /* 40 1K datagrams */
                    469:
                    470: /*ARGSUSED*/
1.7       mycroft   471: int
1.1       cgd       472: udp_usrreq(so, req, m, addr, control)
                    473:        struct socket *so;
                    474:        int req;
                    475:        struct mbuf *m, *addr, *control;
                    476: {
                    477:        struct inpcb *inp = sotoinpcb(so);
                    478:        int error = 0;
                    479:        int s;
                    480:
                    481:        if (req == PRU_CONTROL)
                    482:                return (in_control(so, (int)m, (caddr_t)addr,
                    483:                        (struct ifnet *)control));
                    484:        if (inp == NULL && req != PRU_ATTACH) {
                    485:                error = EINVAL;
                    486:                goto release;
                    487:        }
                    488:        /*
                    489:         * Note: need to block udp_input while changing
                    490:         * the udp pcb queue and/or pcb addresses.
                    491:         */
                    492:        switch (req) {
                    493:
                    494:        case PRU_ATTACH:
                    495:                if (inp != NULL) {
                    496:                        error = EINVAL;
                    497:                        break;
                    498:                }
                    499:                s = splnet();
                    500:                error = in_pcballoc(so, &udb);
                    501:                splx(s);
                    502:                if (error)
                    503:                        break;
                    504:                error = soreserve(so, udp_sendspace, udp_recvspace);
                    505:                if (error)
                    506:                        break;
1.13      mycroft   507:                ((struct inpcb *) so->so_pcb)->inp_ip.ip_ttl = ip_defttl;
1.1       cgd       508:                break;
                    509:
                    510:        case PRU_DETACH:
                    511:                udp_detach(inp);
                    512:                break;
                    513:
                    514:        case PRU_BIND:
                    515:                s = splnet();
                    516:                error = in_pcbbind(inp, addr);
                    517:                splx(s);
                    518:                break;
                    519:
                    520:        case PRU_LISTEN:
                    521:                error = EOPNOTSUPP;
                    522:                break;
                    523:
                    524:        case PRU_CONNECT:
                    525:                if (inp->inp_faddr.s_addr != INADDR_ANY) {
                    526:                        error = EISCONN;
                    527:                        break;
                    528:                }
                    529:                s = splnet();
                    530:                error = in_pcbconnect(inp, addr);
                    531:                splx(s);
                    532:                if (error == 0)
                    533:                        soisconnected(so);
                    534:                break;
                    535:
                    536:        case PRU_CONNECT2:
                    537:                error = EOPNOTSUPP;
                    538:                break;
                    539:
                    540:        case PRU_ACCEPT:
                    541:                error = EOPNOTSUPP;
                    542:                break;
                    543:
                    544:        case PRU_DISCONNECT:
                    545:                if (inp->inp_faddr.s_addr == INADDR_ANY) {
                    546:                        error = ENOTCONN;
                    547:                        break;
                    548:                }
                    549:                s = splnet();
                    550:                in_pcbdisconnect(inp);
                    551:                inp->inp_laddr.s_addr = INADDR_ANY;
                    552:                splx(s);
                    553:                so->so_state &= ~SS_ISCONNECTED;                /* XXX */
                    554:                break;
                    555:
                    556:        case PRU_SHUTDOWN:
                    557:                socantsendmore(so);
                    558:                break;
                    559:
                    560:        case PRU_SEND:
                    561:                return (udp_output(inp, m, addr, control));
                    562:
                    563:        case PRU_ABORT:
                    564:                soisdisconnected(so);
                    565:                udp_detach(inp);
                    566:                break;
                    567:
                    568:        case PRU_SOCKADDR:
                    569:                in_setsockaddr(inp, addr);
                    570:                break;
                    571:
                    572:        case PRU_PEERADDR:
                    573:                in_setpeeraddr(inp, addr);
                    574:                break;
                    575:
                    576:        case PRU_SENSE:
                    577:                /*
                    578:                 * stat: don't bother with a blocksize.
                    579:                 */
                    580:                return (0);
                    581:
                    582:        case PRU_SENDOOB:
                    583:        case PRU_FASTTIMO:
                    584:        case PRU_SLOWTIMO:
                    585:        case PRU_PROTORCV:
                    586:        case PRU_PROTOSEND:
                    587:                error =  EOPNOTSUPP;
                    588:                break;
                    589:
                    590:        case PRU_RCVD:
                    591:        case PRU_RCVOOB:
                    592:                return (EOPNOTSUPP);    /* do not free mbuf's */
                    593:
                    594:        default:
                    595:                panic("udp_usrreq");
                    596:        }
                    597:
                    598: release:
                    599:        if (control) {
                    600:                printf("udp control data unexpectedly retained\n");
                    601:                m_freem(control);
                    602:        }
                    603:        if (m)
                    604:                m_freem(m);
                    605:        return (error);
                    606: }
                    607:
1.7       mycroft   608: static void
1.1       cgd       609: udp_detach(inp)
                    610:        struct inpcb *inp;
                    611: {
                    612:        int s = splnet();
                    613:
                    614:        if (inp == udp_last_inpcb)
                    615:                udp_last_inpcb = &udb;
                    616:        in_pcbdetach(inp);
                    617:        splx(s);
1.13      mycroft   618: }
                    619:
                    620: /*
                    621:  * Sysctl for udp variables.
                    622:  */
                    623: udp_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
                    624:        int *name;
                    625:        u_int namelen;
                    626:        void *oldp;
                    627:        size_t *oldlenp;
                    628:        void *newp;
                    629:        size_t newlen;
                    630: {
                    631:        /* All sysctl names at this level are terminal. */
                    632:        if (namelen != 1)
                    633:                return (ENOTDIR);
                    634:
                    635:        switch (name[0]) {
                    636:        case UDPCTL_CHECKSUM:
                    637:                return (sysctl_int(oldp, oldlenp, newp, newlen, &udpcksum));
                    638:        default:
                    639:                return (ENOPROTOOPT);
                    640:        }
                    641:        /* NOTREACHED */
1.1       cgd       642: }

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