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Annotation of src/sys/netinet/udp_usrreq.c, Revision 1.6

1.1       cgd         1: /*
                      2:  * Copyright (c) 1982, 1986, 1988, 1990 Regents of the University of California.
                      3:  * All rights reserved.
                      4:  *
                      5:  * Redistribution and use in source and binary forms, with or without
                      6:  * modification, are permitted provided that the following conditions
                      7:  * are met:
                      8:  * 1. Redistributions of source code must retain the above copyright
                      9:  *    notice, this list of conditions and the following disclaimer.
                     10:  * 2. Redistributions in binary form must reproduce the above copyright
                     11:  *    notice, this list of conditions and the following disclaimer in the
                     12:  *    documentation and/or other materials provided with the distribution.
                     13:  * 3. All advertising materials mentioning features or use of this software
                     14:  *    must display the following acknowledgement:
                     15:  *     This product includes software developed by the University of
                     16:  *     California, Berkeley and its contributors.
                     17:  * 4. Neither the name of the University nor the names of its contributors
                     18:  *    may be used to endorse or promote products derived from this software
                     19:  *    without specific prior written permission.
                     20:  *
                     21:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     22:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     23:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     24:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     25:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     26:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     27:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     28:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     29:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     30:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     31:  * SUCH DAMAGE.
                     32:  *
1.2       cgd        33:  *     from: @(#)udp_usrreq.c  7.20 (Berkeley) 4/20/91
1.6     ! mycroft    34:  *     $Id: udp_usrreq.c,v 1.5 1993/12/18 00:42:15 mycroft Exp $
1.1       cgd        35:  */
                     36:
1.5       mycroft    37: #include <sys/param.h>
                     38: #include <sys/malloc.h>
                     39: #include <sys/mbuf.h>
                     40: #include <sys/protosw.h>
                     41: #include <sys/socket.h>
                     42: #include <sys/socketvar.h>
                     43: #include <sys/stat.h>
1.1       cgd        44:
1.5       mycroft    45: #include <net/if.h>
                     46: #include <net/route.h>
1.1       cgd        47:
1.5       mycroft    48: #include <netinet/in.h>
                     49: #include <netinet/in_systm.h>
                     50: #include <netinet/ip.h>
                     51: #include <netinet/in_pcb.h>
                     52: #include <netinet/ip_var.h>
                     53: #include <netinet/ip_icmp.h>
                     54: #include <netinet/udp.h>
                     55: #include <netinet/udp_var.h>
1.1       cgd        56:
                     57: struct inpcb *udp_last_inpcb = &udb;
                     58:
                     59: /*
                     60:  * UDP protocol implementation.
                     61:  * Per RFC 768, August, 1980.
                     62:  */
                     63: udp_init()
                     64: {
                     65:
                     66:        udb.inp_next = udb.inp_prev = &udb;
                     67: }
                     68:
                     69: #ifndef        COMPAT_42
                     70: int    udpcksum = 1;
                     71: #else
                     72: int    udpcksum = 0;           /* XXX */
                     73: #endif
                     74: int    udp_ttl = UDP_TTL;
                     75:
                     76: struct sockaddr_in udp_in = { sizeof(udp_in), AF_INET };
                     77:
                     78: udp_input(m, iphlen)
                     79:        register struct mbuf *m;
                     80:        int iphlen;
                     81: {
                     82:        register struct ip *ip;
                     83:        register struct udphdr *uh;
                     84:        register struct inpcb *inp;
                     85:        struct mbuf *opts = 0;
                     86:        int len;
                     87:        struct ip save_ip;
                     88:
                     89:        udpstat.udps_ipackets++;
                     90:
                     91:        /*
                     92:         * Strip IP options, if any; should skip this,
                     93:         * make available to user, and use on returned packets,
                     94:         * but we don't yet have a way to check the checksum
                     95:         * with options still present.
                     96:         */
                     97:        if (iphlen > sizeof (struct ip)) {
                     98:                ip_stripoptions(m, (struct mbuf *)0);
                     99:                iphlen = sizeof(struct ip);
                    100:        }
                    101:
                    102:        /*
                    103:         * Get IP and UDP header together in first mbuf.
                    104:         */
                    105:        ip = mtod(m, struct ip *);
                    106:        if (m->m_len < iphlen + sizeof(struct udphdr)) {
                    107:                if ((m = m_pullup(m, iphlen + sizeof(struct udphdr))) == 0) {
                    108:                        udpstat.udps_hdrops++;
                    109:                        return;
                    110:                }
                    111:                ip = mtod(m, struct ip *);
                    112:        }
                    113:        uh = (struct udphdr *)((caddr_t)ip + iphlen);
                    114:
                    115:        /*
                    116:         * Make mbuf data length reflect UDP length.
                    117:         * If not enough data to reflect UDP length, drop.
                    118:         */
                    119:        len = ntohs((u_short)uh->uh_ulen);
                    120:        if (ip->ip_len != len) {
                    121:                if (len > ip->ip_len) {
                    122:                        udpstat.udps_badlen++;
                    123:                        goto bad;
                    124:                }
                    125:                m_adj(m, len - ip->ip_len);
                    126:                /* ip->ip_len = len; */
                    127:        }
                    128:        /*
                    129:         * Save a copy of the IP header in case we want restore it
                    130:         * for sending an ICMP error message in response.
                    131:         */
                    132:        save_ip = *ip;
                    133:
                    134:        /*
                    135:         * Checksum extended UDP header and data.
                    136:         */
                    137:        if (udpcksum && uh->uh_sum) {
                    138:                ((struct ipovly *)ip)->ih_next = 0;
                    139:                ((struct ipovly *)ip)->ih_prev = 0;
                    140:                ((struct ipovly *)ip)->ih_x1 = 0;
                    141:                ((struct ipovly *)ip)->ih_len = uh->uh_ulen;
                    142:                if (uh->uh_sum = in_cksum(m, len + sizeof (struct ip))) {
                    143:                        udpstat.udps_badsum++;
                    144:                        m_freem(m);
                    145:                        return;
                    146:                }
                    147:        }
1.4       hpeyerl   148: #ifdef MULTICAST
                    149:        if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) ||
                    150:            in_broadcast(ip->ip_dst)) {
                    151:                struct socket *last;
                    152:                /*
                    153:                 * Deliver a multicast or broadcast datagram to *all* sockets
                    154:                 * for which the local and remote addresses and ports match
                    155:                 * those of the incoming datagram.  This allows more than
                    156:                 * one process to receive multi/broadcasts on the same port.
                    157:                 * (This really ought to be done for unicast datagrams as
                    158:                 * well, but that would cause problems with existing
                    159:                 * applications that open both address-specific sockets and
                    160:                 * a wildcard socket listening to the same port -- they would
                    161:                 * end up receiving duplicates of every unicast datagram.
                    162:                 * Those applications open the multiple sockets to overcome an
                    163:                 * inadequacy of the UDP socket interface, but for backwards
                    164:                 * compatibility we avoid the problem here rather than
                    165:                 * fixing the interface.  Maybe 4.4BSD will remedy this?)
                    166:                 */
                    167:                /*
                    168:                 * Construct sockaddr format source address.
                    169:                 */
                    170:                udp_in.sin_port = uh->uh_sport;
                    171:                udp_in.sin_addr = ip->ip_src;
                    172:                m->m_len -= sizeof (struct udpiphdr);
                    173:                m->m_data += sizeof (struct udpiphdr);
                    174:                /*
                    175:                 * Locate pcb(s) for datagram.
                    176:                 * (Algorithm copied from raw_intr().)
                    177:                 */
                    178:                last = NULL;
                    179:                for (inp = udb.inp_next; inp != &udb; inp = inp->inp_next) {
                    180:                        if (inp->inp_lport != uh->uh_dport)
                    181:                                continue;
                    182:                        if (inp->inp_laddr.s_addr != INADDR_ANY) {
                    183:                                if (inp->inp_laddr.s_addr !=
                    184:                                    ip->ip_dst.s_addr)
                    185:                                        continue;
                    186:                        }
                    187:                        if (inp->inp_faddr.s_addr != INADDR_ANY) {
1.6     ! mycroft   188:                                if (inp->inp_faddr.s_addr !=
1.4       hpeyerl   189:                                    ip->ip_src.s_addr ||
                    190:                                    inp->inp_fport != uh->uh_sport)
                    191:                                        continue;
                    192:                        }
                    193:
                    194:                        if (last != NULL) {
                    195:                                struct mbuf *n;
                    196:
                    197:                                if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
                    198:                                        if (sbappendaddr(&last->so_rcv,
                    199:                                                (struct sockaddr *)&udp_in,
                    200:                                                n, (struct mbuf *)0) == 0)
                    201:                                                m_freem(n);
                    202:                                        else
                    203:                                                sorwakeup(last);
                    204:                                }
                    205:                        }
                    206:                        last = inp->inp_socket;
                    207:                        /*
                    208:                         * Don't look for additional matches if this one
                    209:                         * does not have the SO_REUSEADDR socket option set.
                    210:                         * This heuristic avoids searching through all pcbs
                    211:                         * in the common case of a non-shared port.  It
                    212:                         * assumes that an application will never clear
                    213:                         * the SO_REUSEADDR option after setting it.
                    214:                         */
                    215:                        if ((last->so_options & SO_REUSEADDR) == 0)
                    216:                                break;
                    217:                }
1.6     ! mycroft   218:
1.4       hpeyerl   219:                if (last == NULL) {
                    220:                        /*
                    221:                         * No matching pcb found; discard datagram.
                    222:                         * (No need to send an ICMP Port Unreachable
                    223:                         * for a broadcast or multicast datgram.)
                    224:                         */
                    225:                        goto bad;
                    226:                }
                    227:                if (sbappendaddr(&last->so_rcv, (struct sockaddr *)&udp_in,
                    228:                     m, (struct mbuf *)0) == 0)
                    229:                        goto bad;
                    230:                sorwakeup(last);
                    231:                return;
                    232:        }
                    233: #endif
1.1       cgd       234:        /*
                    235:         * Locate pcb for datagram.
                    236:         */
                    237:        inp = udp_last_inpcb;
                    238:        if (inp->inp_lport != uh->uh_dport ||
                    239:            inp->inp_fport != uh->uh_sport ||
                    240:            inp->inp_faddr.s_addr != ip->ip_src.s_addr ||
                    241:            inp->inp_laddr.s_addr != ip->ip_dst.s_addr) {
                    242:                inp = in_pcblookup(&udb, ip->ip_src, uh->uh_sport,
                    243:                    ip->ip_dst, uh->uh_dport, INPLOOKUP_WILDCARD);
                    244:                if (inp)
                    245:                        udp_last_inpcb = inp;
                    246:                udpstat.udpps_pcbcachemiss++;
                    247:        }
                    248:        if (inp == 0) {
                    249:                /* don't send ICMP response for broadcast packet */
                    250:                udpstat.udps_noport++;
1.4       hpeyerl   251: #ifndef MULTICAST
                    252:                /* XXX why don't we do this with MULTICAST? */
                    253:                if (m->m_flags & (M_BCAST | M_MCAST)) {
1.1       cgd       254:                        udpstat.udps_noportbcast++;
                    255:                        goto bad;
                    256:                }
1.4       hpeyerl   257: #endif
1.1       cgd       258:                *ip = save_ip;
                    259:                ip->ip_len += iphlen;
                    260:                icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT);
                    261:                return;
                    262:        }
                    263:
                    264:        /*
                    265:         * Construct sockaddr format source address.
                    266:         * Stuff source address and datagram in user buffer.
                    267:         */
                    268:        udp_in.sin_port = uh->uh_sport;
                    269:        udp_in.sin_addr = ip->ip_src;
                    270:        if (inp->inp_flags & INP_CONTROLOPTS) {
                    271:                struct mbuf **mp = &opts;
                    272:                struct mbuf *udp_saveopt();
                    273:
                    274:                if (inp->inp_flags & INP_RECVDSTADDR) {
                    275:                        *mp = udp_saveopt((caddr_t) &ip->ip_dst,
                    276:                            sizeof(struct in_addr), IP_RECVDSTADDR);
                    277:                        if (*mp)
                    278:                                mp = &(*mp)->m_next;
                    279:                }
                    280: #ifdef notyet
                    281:                /* options were tossed above */
                    282:                if (inp->inp_flags & INP_RECVOPTS) {
                    283:                        *mp = udp_saveopt((caddr_t) opts_deleted_above,
                    284:                            sizeof(struct in_addr), IP_RECVOPTS);
                    285:                        if (*mp)
                    286:                                mp = &(*mp)->m_next;
                    287:                }
                    288:                /* ip_srcroute doesn't do what we want here, need to fix */
                    289:                if (inp->inp_flags & INP_RECVRETOPTS) {
                    290:                        *mp = udp_saveopt((caddr_t) ip_srcroute(),
                    291:                            sizeof(struct in_addr), IP_RECVRETOPTS);
                    292:                        if (*mp)
                    293:                                mp = &(*mp)->m_next;
                    294:                }
                    295: #endif
                    296:        }
                    297:        iphlen += sizeof(struct udphdr);
                    298:        m->m_len -= iphlen;
                    299:        m->m_pkthdr.len -= iphlen;
                    300:        m->m_data += iphlen;
                    301:        if (sbappendaddr(&inp->inp_socket->so_rcv, (struct sockaddr *)&udp_in,
                    302:            m, opts) == 0) {
                    303:                udpstat.udps_fullsock++;
                    304:                goto bad;
                    305:        }
                    306:        sorwakeup(inp->inp_socket);
                    307:        return;
                    308: bad:
                    309:        m_freem(m);
                    310:        if (opts)
                    311:                m_freem(opts);
                    312: }
                    313:
                    314: /*
                    315:  * Create a "control" mbuf containing the specified data
                    316:  * with the specified type for presentation with a datagram.
                    317:  */
                    318: struct mbuf *
                    319: udp_saveopt(p, size, type)
                    320:        caddr_t p;
                    321:        register int size;
                    322:        int type;
                    323: {
                    324:        register struct cmsghdr *cp;
                    325:        struct mbuf *m;
                    326:
                    327:        if ((m = m_get(M_DONTWAIT, MT_CONTROL)) == NULL)
                    328:                return ((struct mbuf *) NULL);
                    329:        cp = (struct cmsghdr *) mtod(m, struct cmsghdr *);
                    330:        bcopy(p, (caddr_t)(cp + 1), size);
                    331:        size += sizeof(*cp);
                    332:        m->m_len = size;
                    333:        cp->cmsg_len = size;
                    334:        cp->cmsg_level = IPPROTO_IP;
                    335:        cp->cmsg_type = type;
                    336:        return (m);
                    337: }
                    338:
                    339: /*
                    340:  * Notify a udp user of an asynchronous error;
                    341:  * just wake up so that he can collect error status.
                    342:  */
                    343: udp_notify(inp, errno)
                    344:        register struct inpcb *inp;
                    345: {
                    346:
                    347:        inp->inp_socket->so_error = errno;
                    348:        sorwakeup(inp->inp_socket);
                    349:        sowwakeup(inp->inp_socket);
                    350: }
                    351:
                    352: udp_ctlinput(cmd, sa, ip)
                    353:        int cmd;
                    354:        struct sockaddr *sa;
                    355:        register struct ip *ip;
                    356: {
                    357:        register struct udphdr *uh;
                    358:        extern struct in_addr zeroin_addr;
                    359:        extern u_char inetctlerrmap[];
                    360:
                    361:        if ((unsigned)cmd > PRC_NCMDS || inetctlerrmap[cmd] == 0)
                    362:                return;
                    363:        if (ip) {
                    364:                uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2));
                    365:                in_pcbnotify(&udb, sa, uh->uh_dport, ip->ip_src, uh->uh_sport,
                    366:                        cmd, udp_notify);
                    367:        } else
                    368:                in_pcbnotify(&udb, sa, 0, zeroin_addr, 0, cmd, udp_notify);
                    369: }
                    370:
                    371: udp_output(inp, m, addr, control)
                    372:        register struct inpcb *inp;
                    373:        register struct mbuf *m;
                    374:        struct mbuf *addr, *control;
                    375: {
                    376:        register struct udpiphdr *ui;
                    377:        register int len = m->m_pkthdr.len;
                    378:        struct in_addr laddr;
                    379:        int s, error = 0;
                    380:
                    381:        if (control)
                    382:                m_freem(control);               /* XXX */
                    383:
                    384:        if (addr) {
                    385:                laddr = inp->inp_laddr;
                    386:                if (inp->inp_faddr.s_addr != INADDR_ANY) {
                    387:                        error = EISCONN;
                    388:                        goto release;
                    389:                }
                    390:                /*
                    391:                 * Must block input while temporarily connected.
                    392:                 */
                    393:                s = splnet();
                    394:                error = in_pcbconnect(inp, addr);
                    395:                if (error) {
                    396:                        splx(s);
                    397:                        goto release;
                    398:                }
                    399:        } else {
                    400:                if (inp->inp_faddr.s_addr == INADDR_ANY) {
                    401:                        error = ENOTCONN;
                    402:                        goto release;
                    403:                }
                    404:        }
                    405:        /*
                    406:         * Calculate data length and get a mbuf
                    407:         * for UDP and IP headers.
                    408:         */
                    409:        M_PREPEND(m, sizeof(struct udpiphdr), M_WAIT);
                    410:
                    411:        /*
                    412:         * Fill in mbuf with extended UDP header
                    413:         * and addresses and length put into network format.
                    414:         */
                    415:        ui = mtod(m, struct udpiphdr *);
                    416:        ui->ui_next = ui->ui_prev = 0;
                    417:        ui->ui_x1 = 0;
                    418:        ui->ui_pr = IPPROTO_UDP;
                    419:        ui->ui_len = htons((u_short)len + sizeof (struct udphdr));
                    420:        ui->ui_src = inp->inp_laddr;
                    421:        ui->ui_dst = inp->inp_faddr;
                    422:        ui->ui_sport = inp->inp_lport;
                    423:        ui->ui_dport = inp->inp_fport;
                    424:        ui->ui_ulen = ui->ui_len;
                    425:
                    426:        /*
                    427:         * Stuff checksum and output datagram.
                    428:         */
                    429:        ui->ui_sum = 0;
                    430:        if (udpcksum) {
                    431:            if ((ui->ui_sum = in_cksum(m, sizeof (struct udpiphdr) + len)) == 0)
                    432:                ui->ui_sum = 0xffff;
                    433:        }
                    434:        ((struct ip *)ui)->ip_len = sizeof (struct udpiphdr) + len;
                    435:        ((struct ip *)ui)->ip_ttl = inp->inp_ip.ip_ttl; /* XXX */
                    436:        ((struct ip *)ui)->ip_tos = inp->inp_ip.ip_tos; /* XXX */
                    437:        udpstat.udps_opackets++;
                    438:        error = ip_output(m, inp->inp_options, &inp->inp_route,
1.4       hpeyerl   439:            inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST)
                    440: #ifdef MULTICAST
                    441:                | IP_MULTICASTOPTS, inp->inp_moptions
                    442: #endif
                    443:                );
1.1       cgd       444:
                    445:        if (addr) {
                    446:                in_pcbdisconnect(inp);
                    447:                inp->inp_laddr = laddr;
                    448:                splx(s);
                    449:        }
                    450:        return (error);
                    451:
                    452: release:
                    453:        m_freem(m);
                    454:        return (error);
                    455: }
                    456:
                    457: u_long udp_sendspace = 9216;           /* really max datagram size */
                    458: u_long udp_recvspace = 40 * (1024 + sizeof(struct sockaddr_in));
                    459:                                        /* 40 1K datagrams */
                    460:
                    461: /*ARGSUSED*/
                    462: udp_usrreq(so, req, m, addr, control)
                    463:        struct socket *so;
                    464:        int req;
                    465:        struct mbuf *m, *addr, *control;
                    466: {
                    467:        struct inpcb *inp = sotoinpcb(so);
                    468:        int error = 0;
                    469:        int s;
                    470:
                    471:        if (req == PRU_CONTROL)
                    472:                return (in_control(so, (int)m, (caddr_t)addr,
                    473:                        (struct ifnet *)control));
                    474:        if (inp == NULL && req != PRU_ATTACH) {
                    475:                error = EINVAL;
                    476:                goto release;
                    477:        }
                    478:        /*
                    479:         * Note: need to block udp_input while changing
                    480:         * the udp pcb queue and/or pcb addresses.
                    481:         */
                    482:        switch (req) {
                    483:
                    484:        case PRU_ATTACH:
                    485:                if (inp != NULL) {
                    486:                        error = EINVAL;
                    487:                        break;
                    488:                }
                    489:                s = splnet();
                    490:                error = in_pcballoc(so, &udb);
                    491:                splx(s);
                    492:                if (error)
                    493:                        break;
                    494:                error = soreserve(so, udp_sendspace, udp_recvspace);
                    495:                if (error)
                    496:                        break;
                    497:                ((struct inpcb *) so->so_pcb)->inp_ip.ip_ttl = udp_ttl;
                    498:                break;
                    499:
                    500:        case PRU_DETACH:
                    501:                udp_detach(inp);
                    502:                break;
                    503:
                    504:        case PRU_BIND:
                    505:                s = splnet();
                    506:                error = in_pcbbind(inp, addr);
                    507:                splx(s);
                    508:                break;
                    509:
                    510:        case PRU_LISTEN:
                    511:                error = EOPNOTSUPP;
                    512:                break;
                    513:
                    514:        case PRU_CONNECT:
                    515:                if (inp->inp_faddr.s_addr != INADDR_ANY) {
                    516:                        error = EISCONN;
                    517:                        break;
                    518:                }
                    519:                s = splnet();
                    520:                error = in_pcbconnect(inp, addr);
                    521:                splx(s);
                    522:                if (error == 0)
                    523:                        soisconnected(so);
                    524:                break;
                    525:
                    526:        case PRU_CONNECT2:
                    527:                error = EOPNOTSUPP;
                    528:                break;
                    529:
                    530:        case PRU_ACCEPT:
                    531:                error = EOPNOTSUPP;
                    532:                break;
                    533:
                    534:        case PRU_DISCONNECT:
                    535:                if (inp->inp_faddr.s_addr == INADDR_ANY) {
                    536:                        error = ENOTCONN;
                    537:                        break;
                    538:                }
                    539:                s = splnet();
                    540:                in_pcbdisconnect(inp);
                    541:                inp->inp_laddr.s_addr = INADDR_ANY;
                    542:                splx(s);
                    543:                so->so_state &= ~SS_ISCONNECTED;                /* XXX */
                    544:                break;
                    545:
                    546:        case PRU_SHUTDOWN:
                    547:                socantsendmore(so);
                    548:                break;
                    549:
                    550:        case PRU_SEND:
                    551:                return (udp_output(inp, m, addr, control));
                    552:
                    553:        case PRU_ABORT:
                    554:                soisdisconnected(so);
                    555:                udp_detach(inp);
                    556:                break;
                    557:
                    558:        case PRU_SOCKADDR:
                    559:                in_setsockaddr(inp, addr);
                    560:                break;
                    561:
                    562:        case PRU_PEERADDR:
                    563:                in_setpeeraddr(inp, addr);
                    564:                break;
                    565:
                    566:        case PRU_SENSE:
                    567:                /*
                    568:                 * stat: don't bother with a blocksize.
                    569:                 */
                    570:                return (0);
                    571:
                    572:        case PRU_SENDOOB:
                    573:        case PRU_FASTTIMO:
                    574:        case PRU_SLOWTIMO:
                    575:        case PRU_PROTORCV:
                    576:        case PRU_PROTOSEND:
                    577:                error =  EOPNOTSUPP;
                    578:                break;
                    579:
                    580:        case PRU_RCVD:
                    581:        case PRU_RCVOOB:
                    582:                return (EOPNOTSUPP);    /* do not free mbuf's */
                    583:
                    584:        default:
                    585:                panic("udp_usrreq");
                    586:        }
                    587:
                    588: release:
                    589:        if (control) {
                    590:                printf("udp control data unexpectedly retained\n");
                    591:                m_freem(control);
                    592:        }
                    593:        if (m)
                    594:                m_freem(m);
                    595:        return (error);
                    596: }
                    597:
                    598: udp_detach(inp)
                    599:        struct inpcb *inp;
                    600: {
                    601:        int s = splnet();
                    602:
                    603:        if (inp == udp_last_inpcb)
                    604:                udp_last_inpcb = &udb;
                    605:        in_pcbdetach(inp);
                    606:        splx(s);
                    607: }

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