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Annotation of src/sys/netinet/udp_usrreq.c, Revision 1.21

1.21    ! mycroft     1: /*     $NetBSD: udp_usrreq.c,v 1.20 1995/06/12 06:46:40 mycroft Exp $  */
1.14      cgd         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>
1.15      cgd        52: #include <netinet/in_var.h>
1.5       mycroft    53: #include <netinet/ip.h>
                     54: #include <netinet/in_pcb.h>
                     55: #include <netinet/ip_var.h>
                     56: #include <netinet/ip_icmp.h>
                     57: #include <netinet/udp.h>
                     58: #include <netinet/udp_var.h>
1.1       cgd        59:
1.8       mycroft    60: /*
                     61:  * UDP protocol implementation.
                     62:  * Per RFC 768, August, 1980.
                     63:  */
                     64: #ifndef        COMPAT_42
                     65: int    udpcksum = 1;
                     66: #else
                     67: int    udpcksum = 0;           /* XXX */
                     68: #endif
                     69:
                     70: struct sockaddr_in udp_in = { sizeof(udp_in), AF_INET };
1.18      mycroft    71: struct inpcb *udp_last_inpcb = 0;
1.1       cgd        72:
1.13      mycroft    73: static void udp_detach __P((struct inpcb *));
                     74: static void udp_notify __P((struct inpcb *, int));
                     75: static struct mbuf *udp_saveopt __P((caddr_t, int, int));
1.7       mycroft    76:
                     77: void
1.1       cgd        78: udp_init()
                     79: {
1.18      mycroft    80:
                     81:        in_pcbinit(&udbtable);
1.1       cgd        82: }
                     83:
1.7       mycroft    84: void
1.1       cgd        85: udp_input(m, iphlen)
                     86:        register struct mbuf *m;
                     87:        int iphlen;
                     88: {
                     89:        register struct ip *ip;
                     90:        register struct udphdr *uh;
                     91:        register struct inpcb *inp;
                     92:        struct mbuf *opts = 0;
                     93:        int len;
                     94:        struct ip save_ip;
                     95:
                     96:        udpstat.udps_ipackets++;
                     97:
                     98:        /*
                     99:         * Strip IP options, if any; should skip this,
                    100:         * make available to user, and use on returned packets,
                    101:         * but we don't yet have a way to check the checksum
                    102:         * with options still present.
                    103:         */
                    104:        if (iphlen > sizeof (struct ip)) {
                    105:                ip_stripoptions(m, (struct mbuf *)0);
                    106:                iphlen = sizeof(struct ip);
                    107:        }
                    108:
                    109:        /*
                    110:         * Get IP and UDP header together in first mbuf.
                    111:         */
                    112:        ip = mtod(m, struct ip *);
                    113:        if (m->m_len < iphlen + sizeof(struct udphdr)) {
                    114:                if ((m = m_pullup(m, iphlen + sizeof(struct udphdr))) == 0) {
                    115:                        udpstat.udps_hdrops++;
                    116:                        return;
                    117:                }
                    118:                ip = mtod(m, struct ip *);
                    119:        }
                    120:        uh = (struct udphdr *)((caddr_t)ip + iphlen);
                    121:
                    122:        /*
                    123:         * Make mbuf data length reflect UDP length.
                    124:         * If not enough data to reflect UDP length, drop.
                    125:         */
1.15      cgd       126:        len = ntohs((u_int16_t)uh->uh_ulen);
1.1       cgd       127:        if (ip->ip_len != len) {
                    128:                if (len > ip->ip_len) {
                    129:                        udpstat.udps_badlen++;
                    130:                        goto bad;
                    131:                }
                    132:                m_adj(m, len - ip->ip_len);
                    133:                /* ip->ip_len = len; */
                    134:        }
                    135:        /*
                    136:         * Save a copy of the IP header in case we want restore it
                    137:         * for sending an ICMP error message in response.
                    138:         */
                    139:        save_ip = *ip;
                    140:
                    141:        /*
                    142:         * Checksum extended UDP header and data.
                    143:         */
                    144:        if (udpcksum && uh->uh_sum) {
                    145:                ((struct ipovly *)ip)->ih_next = 0;
                    146:                ((struct ipovly *)ip)->ih_prev = 0;
                    147:                ((struct ipovly *)ip)->ih_x1 = 0;
                    148:                ((struct ipovly *)ip)->ih_len = uh->uh_ulen;
                    149:                if (uh->uh_sum = in_cksum(m, len + sizeof (struct ip))) {
                    150:                        udpstat.udps_badsum++;
                    151:                        m_freem(m);
                    152:                        return;
                    153:                }
                    154:        }
1.13      mycroft   155:
1.16      mycroft   156:        if (IN_MULTICAST(ip->ip_dst.s_addr) ||
1.13      mycroft   157:            in_broadcast(ip->ip_dst, m->m_pkthdr.rcvif)) {
1.4       hpeyerl   158:                struct socket *last;
                    159:                /*
                    160:                 * Deliver a multicast or broadcast datagram to *all* sockets
                    161:                 * for which the local and remote addresses and ports match
                    162:                 * those of the incoming datagram.  This allows more than
                    163:                 * one process to receive multi/broadcasts on the same port.
                    164:                 * (This really ought to be done for unicast datagrams as
                    165:                 * well, but that would cause problems with existing
                    166:                 * applications that open both address-specific sockets and
                    167:                 * a wildcard socket listening to the same port -- they would
                    168:                 * end up receiving duplicates of every unicast datagram.
                    169:                 * Those applications open the multiple sockets to overcome an
                    170:                 * inadequacy of the UDP socket interface, but for backwards
                    171:                 * compatibility we avoid the problem here rather than
1.13      mycroft   172:                 * fixing the interface.  Maybe 4.5BSD will remedy this?)
1.4       hpeyerl   173:                 */
1.13      mycroft   174:
1.4       hpeyerl   175:                /*
                    176:                 * Construct sockaddr format source address.
                    177:                 */
                    178:                udp_in.sin_port = uh->uh_sport;
                    179:                udp_in.sin_addr = ip->ip_src;
                    180:                m->m_len -= sizeof (struct udpiphdr);
                    181:                m->m_data += sizeof (struct udpiphdr);
                    182:                /*
                    183:                 * Locate pcb(s) for datagram.
                    184:                 * (Algorithm copied from raw_intr().)
                    185:                 */
                    186:                last = NULL;
1.18      mycroft   187:                for (inp = udbtable.inpt_list.lh_first; inp != 0;
                    188:                    inp = inp->inp_list.le_next) {
1.4       hpeyerl   189:                        if (inp->inp_lport != uh->uh_dport)
                    190:                                continue;
                    191:                        if (inp->inp_laddr.s_addr != INADDR_ANY) {
                    192:                                if (inp->inp_laddr.s_addr !=
                    193:                                    ip->ip_dst.s_addr)
                    194:                                        continue;
                    195:                        }
                    196:                        if (inp->inp_faddr.s_addr != INADDR_ANY) {
1.6       mycroft   197:                                if (inp->inp_faddr.s_addr !=
1.4       hpeyerl   198:                                    ip->ip_src.s_addr ||
                    199:                                    inp->inp_fport != uh->uh_sport)
                    200:                                        continue;
                    201:                        }
                    202:
                    203:                        if (last != NULL) {
                    204:                                struct mbuf *n;
                    205:
                    206:                                if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
                    207:                                        if (sbappendaddr(&last->so_rcv,
1.17      mycroft   208:                                                sintosa(&udp_in), n,
                    209:                                                (struct mbuf *)0) == 0) {
1.4       hpeyerl   210:                                                m_freem(n);
1.13      mycroft   211:                                                udpstat.udps_fullsock++;
                    212:                                        } else
1.4       hpeyerl   213:                                                sorwakeup(last);
                    214:                                }
                    215:                        }
                    216:                        last = inp->inp_socket;
                    217:                        /*
1.13      mycroft   218:                         * Don't look for additional matches if this one does
                    219:                         * not have either the SO_REUSEPORT or SO_REUSEADDR
                    220:                         * socket options set.  This heuristic avoids searching
                    221:                         * through all pcbs in the common case of a non-shared
                    222:                         * port.  It * assumes that an application will never
                    223:                         * clear these options after setting them.
1.4       hpeyerl   224:                         */
1.13      mycroft   225:                        if ((last->so_options&(SO_REUSEPORT|SO_REUSEADDR) == 0))
1.4       hpeyerl   226:                                break;
                    227:                }
1.6       mycroft   228:
1.4       hpeyerl   229:                if (last == NULL) {
                    230:                        /*
                    231:                         * No matching pcb found; discard datagram.
                    232:                         * (No need to send an ICMP Port Unreachable
                    233:                         * for a broadcast or multicast datgram.)
                    234:                         */
1.13      mycroft   235:                        udpstat.udps_noportbcast++;
1.4       hpeyerl   236:                        goto bad;
                    237:                }
1.17      mycroft   238:                if (sbappendaddr(&last->so_rcv, sintosa(&udp_in), m,
                    239:                    (struct mbuf *)0) == 0) {
1.13      mycroft   240:                        udpstat.udps_fullsock++;
1.4       hpeyerl   241:                        goto bad;
1.13      mycroft   242:                }
1.4       hpeyerl   243:                sorwakeup(last);
                    244:                return;
                    245:        }
1.1       cgd       246:        /*
                    247:         * Locate pcb for datagram.
                    248:         */
                    249:        inp = udp_last_inpcb;
1.18      mycroft   250:        if (inp == 0 ||
                    251:            inp->inp_lport != uh->uh_dport ||
1.1       cgd       252:            inp->inp_fport != uh->uh_sport ||
                    253:            inp->inp_faddr.s_addr != ip->ip_src.s_addr ||
                    254:            inp->inp_laddr.s_addr != ip->ip_dst.s_addr) {
1.18      mycroft   255:                udpstat.udpps_pcbcachemiss++;
                    256:                inp = in_pcblookup(&udbtable, ip->ip_src, uh->uh_sport,
1.1       cgd       257:                    ip->ip_dst, uh->uh_dport, INPLOOKUP_WILDCARD);
1.18      mycroft   258:                if (inp == 0) {
                    259:                        udpstat.udps_noport++;
                    260:                        if (m->m_flags & (M_BCAST | M_MCAST)) {
                    261:                                udpstat.udps_noportbcast++;
                    262:                                goto bad;
                    263:                        }
                    264:                        *ip = save_ip;
                    265:                        ip->ip_len += iphlen;
                    266:                        icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0);
                    267:                        return;
1.13      mycroft   268:                }
1.18      mycroft   269:                udp_last_inpcb = inp;
1.1       cgd       270:        }
                    271:
                    272:        /*
                    273:         * Construct sockaddr format source address.
                    274:         * Stuff source address and datagram in user buffer.
                    275:         */
                    276:        udp_in.sin_port = uh->uh_sport;
                    277:        udp_in.sin_addr = ip->ip_src;
                    278:        if (inp->inp_flags & INP_CONTROLOPTS) {
                    279:                struct mbuf **mp = &opts;
                    280:
                    281:                if (inp->inp_flags & INP_RECVDSTADDR) {
                    282:                        *mp = udp_saveopt((caddr_t) &ip->ip_dst,
                    283:                            sizeof(struct in_addr), IP_RECVDSTADDR);
                    284:                        if (*mp)
                    285:                                mp = &(*mp)->m_next;
                    286:                }
                    287: #ifdef notyet
                    288:                /* options were tossed above */
                    289:                if (inp->inp_flags & INP_RECVOPTS) {
                    290:                        *mp = udp_saveopt((caddr_t) opts_deleted_above,
                    291:                            sizeof(struct in_addr), IP_RECVOPTS);
                    292:                        if (*mp)
                    293:                                mp = &(*mp)->m_next;
                    294:                }
                    295:                /* ip_srcroute doesn't do what we want here, need to fix */
                    296:                if (inp->inp_flags & INP_RECVRETOPTS) {
                    297:                        *mp = udp_saveopt((caddr_t) ip_srcroute(),
                    298:                            sizeof(struct in_addr), IP_RECVRETOPTS);
                    299:                        if (*mp)
                    300:                                mp = &(*mp)->m_next;
                    301:                }
                    302: #endif
                    303:        }
                    304:        iphlen += sizeof(struct udphdr);
                    305:        m->m_len -= iphlen;
                    306:        m->m_pkthdr.len -= iphlen;
                    307:        m->m_data += iphlen;
1.17      mycroft   308:        if (sbappendaddr(&inp->inp_socket->so_rcv, sintosa(&udp_in), m,
                    309:            opts) == 0) {
1.1       cgd       310:                udpstat.udps_fullsock++;
                    311:                goto bad;
                    312:        }
                    313:        sorwakeup(inp->inp_socket);
                    314:        return;
                    315: bad:
                    316:        m_freem(m);
                    317:        if (opts)
                    318:                m_freem(opts);
                    319: }
                    320:
                    321: /*
                    322:  * Create a "control" mbuf containing the specified data
                    323:  * with the specified type for presentation with a datagram.
                    324:  */
1.13      mycroft   325: struct mbuf *
1.1       cgd       326: udp_saveopt(p, size, type)
                    327:        caddr_t p;
                    328:        register int size;
                    329:        int type;
                    330: {
                    331:        register struct cmsghdr *cp;
                    332:        struct mbuf *m;
                    333:
                    334:        if ((m = m_get(M_DONTWAIT, MT_CONTROL)) == NULL)
                    335:                return ((struct mbuf *) NULL);
                    336:        cp = (struct cmsghdr *) mtod(m, struct cmsghdr *);
1.13      mycroft   337:        bcopy(p, CMSG_DATA(cp), size);
1.1       cgd       338:        size += sizeof(*cp);
                    339:        m->m_len = size;
                    340:        cp->cmsg_len = size;
                    341:        cp->cmsg_level = IPPROTO_IP;
                    342:        cp->cmsg_type = type;
                    343:        return (m);
                    344: }
                    345:
                    346: /*
                    347:  * Notify a udp user of an asynchronous error;
                    348:  * just wake up so that he can collect error status.
                    349:  */
1.7       mycroft   350: static void
1.1       cgd       351: udp_notify(inp, errno)
                    352:        register struct inpcb *inp;
1.7       mycroft   353:        int errno;
1.1       cgd       354: {
                    355:        inp->inp_socket->so_error = errno;
                    356:        sorwakeup(inp->inp_socket);
                    357:        sowwakeup(inp->inp_socket);
                    358: }
                    359:
1.7       mycroft   360: void
1.1       cgd       361: udp_ctlinput(cmd, sa, ip)
                    362:        int cmd;
                    363:        struct sockaddr *sa;
                    364:        register struct ip *ip;
                    365: {
                    366:        register struct udphdr *uh;
                    367:        extern struct in_addr zeroin_addr;
1.21    ! mycroft   368:        extern int inetctlerrmap[];
1.18      mycroft   369:        void (*notify) __P((struct inpcb *, int)) = udp_notify;
1.21    ! mycroft   370:        int errno;
1.1       cgd       371:
1.20      mycroft   372:        if ((unsigned)cmd >= PRC_NCMDS)
                    373:                return;
                    374:        errno = inetctlerrmap[cmd];
1.18      mycroft   375:        if (PRC_IS_REDIRECT(cmd))
1.19      mycroft   376:                notify = in_rtchange, ip = 0;
1.18      mycroft   377:        else if (cmd == PRC_HOSTDEAD)
1.19      mycroft   378:                ip = 0;
1.20      mycroft   379:        else if (errno = 0)
1.1       cgd       380:                return;
1.19      mycroft   381:        if (ip) {
1.1       cgd       382:                uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2));
1.18      mycroft   383:                in_pcbnotify(&udbtable, sa, uh->uh_dport, ip->ip_src,
1.20      mycroft   384:                    uh->uh_sport, errno, notify);
1.19      mycroft   385:        } else
1.20      mycroft   386:                in_pcbnotifyall(&udbtable, sa, errno, notify);
1.1       cgd       387: }
                    388:
1.7       mycroft   389: int
1.1       cgd       390: udp_output(inp, m, addr, control)
                    391:        register struct inpcb *inp;
                    392:        register struct mbuf *m;
                    393:        struct mbuf *addr, *control;
                    394: {
                    395:        register struct udpiphdr *ui;
                    396:        register int len = m->m_pkthdr.len;
                    397:        struct in_addr laddr;
                    398:        int s, error = 0;
                    399:
                    400:        if (control)
                    401:                m_freem(control);               /* XXX */
                    402:
                    403:        if (addr) {
                    404:                laddr = inp->inp_laddr;
                    405:                if (inp->inp_faddr.s_addr != INADDR_ANY) {
                    406:                        error = EISCONN;
                    407:                        goto release;
                    408:                }
                    409:                /*
                    410:                 * Must block input while temporarily connected.
                    411:                 */
                    412:                s = splnet();
                    413:                error = in_pcbconnect(inp, addr);
                    414:                if (error) {
                    415:                        splx(s);
                    416:                        goto release;
                    417:                }
                    418:        } else {
                    419:                if (inp->inp_faddr.s_addr == INADDR_ANY) {
                    420:                        error = ENOTCONN;
                    421:                        goto release;
                    422:                }
                    423:        }
                    424:        /*
                    425:         * Calculate data length and get a mbuf
                    426:         * for UDP and IP headers.
                    427:         */
1.13      mycroft   428:        M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT);
                    429:        if (m == 0) {
                    430:                error = ENOBUFS;
                    431:                goto release;
                    432:        }
1.1       cgd       433:
                    434:        /*
                    435:         * Fill in mbuf with extended UDP header
                    436:         * and addresses and length put into network format.
                    437:         */
                    438:        ui = mtod(m, struct udpiphdr *);
                    439:        ui->ui_next = ui->ui_prev = 0;
                    440:        ui->ui_x1 = 0;
                    441:        ui->ui_pr = IPPROTO_UDP;
1.15      cgd       442:        ui->ui_len = htons((u_int16_t)len + sizeof (struct udphdr));
1.1       cgd       443:        ui->ui_src = inp->inp_laddr;
                    444:        ui->ui_dst = inp->inp_faddr;
                    445:        ui->ui_sport = inp->inp_lport;
                    446:        ui->ui_dport = inp->inp_fport;
                    447:        ui->ui_ulen = ui->ui_len;
                    448:
                    449:        /*
                    450:         * Stuff checksum and output datagram.
                    451:         */
                    452:        ui->ui_sum = 0;
                    453:        if (udpcksum) {
                    454:            if ((ui->ui_sum = in_cksum(m, sizeof (struct udpiphdr) + len)) == 0)
                    455:                ui->ui_sum = 0xffff;
                    456:        }
                    457:        ((struct ip *)ui)->ip_len = sizeof (struct udpiphdr) + len;
                    458:        ((struct ip *)ui)->ip_ttl = inp->inp_ip.ip_ttl; /* XXX */
                    459:        ((struct ip *)ui)->ip_tos = inp->inp_ip.ip_tos; /* XXX */
                    460:        udpstat.udps_opackets++;
                    461:        error = ip_output(m, inp->inp_options, &inp->inp_route,
1.12      mycroft   462:            inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST),
                    463:            inp->inp_moptions);
1.1       cgd       464:
                    465:        if (addr) {
                    466:                in_pcbdisconnect(inp);
                    467:                inp->inp_laddr = laddr;
                    468:                splx(s);
                    469:        }
                    470:        return (error);
                    471:
                    472: release:
                    473:        m_freem(m);
                    474:        return (error);
                    475: }
                    476:
                    477: u_long udp_sendspace = 9216;           /* really max datagram size */
                    478: u_long udp_recvspace = 40 * (1024 + sizeof(struct sockaddr_in));
                    479:                                        /* 40 1K datagrams */
                    480:
                    481: /*ARGSUSED*/
1.7       mycroft   482: int
1.1       cgd       483: udp_usrreq(so, req, m, addr, control)
                    484:        struct socket *so;
                    485:        int req;
                    486:        struct mbuf *m, *addr, *control;
                    487: {
                    488:        struct inpcb *inp = sotoinpcb(so);
                    489:        int error = 0;
                    490:        int s;
                    491:
                    492:        if (req == PRU_CONTROL)
1.15      cgd       493:                return (in_control(so, (long)m, (caddr_t)addr,
1.1       cgd       494:                        (struct ifnet *)control));
                    495:        if (inp == NULL && req != PRU_ATTACH) {
                    496:                error = EINVAL;
                    497:                goto release;
                    498:        }
                    499:        /*
                    500:         * Note: need to block udp_input while changing
                    501:         * the udp pcb queue and/or pcb addresses.
                    502:         */
                    503:        switch (req) {
                    504:
                    505:        case PRU_ATTACH:
                    506:                if (inp != NULL) {
                    507:                        error = EINVAL;
                    508:                        break;
                    509:                }
                    510:                s = splnet();
1.18      mycroft   511:                error = in_pcballoc(so, &udbtable);
1.1       cgd       512:                splx(s);
                    513:                if (error)
                    514:                        break;
                    515:                error = soreserve(so, udp_sendspace, udp_recvspace);
                    516:                if (error)
                    517:                        break;
1.13      mycroft   518:                ((struct inpcb *) so->so_pcb)->inp_ip.ip_ttl = ip_defttl;
1.1       cgd       519:                break;
                    520:
                    521:        case PRU_DETACH:
                    522:                udp_detach(inp);
                    523:                break;
                    524:
                    525:        case PRU_BIND:
                    526:                s = splnet();
                    527:                error = in_pcbbind(inp, addr);
                    528:                splx(s);
                    529:                break;
                    530:
                    531:        case PRU_LISTEN:
                    532:                error = EOPNOTSUPP;
                    533:                break;
                    534:
                    535:        case PRU_CONNECT:
                    536:                if (inp->inp_faddr.s_addr != INADDR_ANY) {
                    537:                        error = EISCONN;
                    538:                        break;
                    539:                }
                    540:                s = splnet();
                    541:                error = in_pcbconnect(inp, addr);
                    542:                splx(s);
                    543:                if (error == 0)
                    544:                        soisconnected(so);
                    545:                break;
                    546:
                    547:        case PRU_CONNECT2:
                    548:                error = EOPNOTSUPP;
                    549:                break;
                    550:
                    551:        case PRU_ACCEPT:
                    552:                error = EOPNOTSUPP;
                    553:                break;
                    554:
                    555:        case PRU_DISCONNECT:
                    556:                if (inp->inp_faddr.s_addr == INADDR_ANY) {
                    557:                        error = ENOTCONN;
                    558:                        break;
                    559:                }
                    560:                s = splnet();
                    561:                in_pcbdisconnect(inp);
                    562:                inp->inp_laddr.s_addr = INADDR_ANY;
                    563:                splx(s);
                    564:                so->so_state &= ~SS_ISCONNECTED;                /* XXX */
                    565:                break;
                    566:
                    567:        case PRU_SHUTDOWN:
                    568:                socantsendmore(so);
                    569:                break;
                    570:
                    571:        case PRU_SEND:
                    572:                return (udp_output(inp, m, addr, control));
                    573:
                    574:        case PRU_ABORT:
                    575:                soisdisconnected(so);
                    576:                udp_detach(inp);
                    577:                break;
                    578:
                    579:        case PRU_SOCKADDR:
                    580:                in_setsockaddr(inp, addr);
                    581:                break;
                    582:
                    583:        case PRU_PEERADDR:
                    584:                in_setpeeraddr(inp, addr);
                    585:                break;
                    586:
                    587:        case PRU_SENSE:
                    588:                /*
                    589:                 * stat: don't bother with a blocksize.
                    590:                 */
                    591:                return (0);
                    592:
                    593:        case PRU_SENDOOB:
                    594:        case PRU_FASTTIMO:
                    595:        case PRU_SLOWTIMO:
                    596:        case PRU_PROTORCV:
                    597:        case PRU_PROTOSEND:
                    598:                error =  EOPNOTSUPP;
                    599:                break;
                    600:
                    601:        case PRU_RCVD:
                    602:        case PRU_RCVOOB:
                    603:                return (EOPNOTSUPP);    /* do not free mbuf's */
                    604:
                    605:        default:
                    606:                panic("udp_usrreq");
                    607:        }
                    608:
                    609: release:
                    610:        if (control) {
                    611:                printf("udp control data unexpectedly retained\n");
                    612:                m_freem(control);
                    613:        }
                    614:        if (m)
                    615:                m_freem(m);
                    616:        return (error);
                    617: }
                    618:
1.7       mycroft   619: static void
1.1       cgd       620: udp_detach(inp)
                    621:        struct inpcb *inp;
                    622: {
                    623:        int s = splnet();
                    624:
                    625:        if (inp == udp_last_inpcb)
1.18      mycroft   626:                udp_last_inpcb = 0;
1.1       cgd       627:        in_pcbdetach(inp);
                    628:        splx(s);
1.13      mycroft   629: }
                    630:
                    631: /*
                    632:  * Sysctl for udp variables.
                    633:  */
                    634: udp_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
                    635:        int *name;
                    636:        u_int namelen;
                    637:        void *oldp;
                    638:        size_t *oldlenp;
                    639:        void *newp;
                    640:        size_t newlen;
                    641: {
                    642:        /* All sysctl names at this level are terminal. */
                    643:        if (namelen != 1)
                    644:                return (ENOTDIR);
                    645:
                    646:        switch (name[0]) {
                    647:        case UDPCTL_CHECKSUM:
                    648:                return (sysctl_int(oldp, oldlenp, newp, newlen, &udpcksum));
                    649:        default:
                    650:                return (ENOPROTOOPT);
                    651:        }
                    652:        /* NOTREACHED */
1.1       cgd       653: }

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