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Annotation of src/sys/netinet/udp_usrreq.c, Revision 1.13

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

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