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Annotation of src/sys/netinet/udp_usrreq.c, Revision 1.1.1.3

1.1       cgd         1: /*
1.1.1.3 ! thorpej     2:  * Copyright (c) 1982, 1986, 1988, 1990, 1993, 1995
1.1.1.2   thorpej     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:  *
1.1.1.3 ! thorpej    33:  *     @(#)udp_usrreq.c        8.6 (Berkeley) 5/23/95
1.1       cgd        34:  */
                     35:
1.1.1.2   thorpej    36: #include <sys/param.h>
                     37: #include <sys/malloc.h>
                     38: #include <sys/mbuf.h>
                     39: #include <sys/protosw.h>
                     40: #include <sys/socket.h>
                     41: #include <sys/socketvar.h>
                     42: #include <sys/errno.h>
                     43: #include <sys/stat.h>
                     44:
                     45: #include <net/if.h>
                     46: #include <net/route.h>
                     47:
                     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: /*
                     58:  * UDP protocol implementation.
                     59:  * Per RFC 768, August, 1980.
                     60:  */
                     61: #ifndef        COMPAT_42
                     62: int    udpcksum = 1;
                     63: #else
                     64: int    udpcksum = 0;           /* XXX */
                     65: #endif
                     66:
                     67: struct sockaddr_in udp_in = { sizeof(udp_in), AF_INET };
1.1.1.2   thorpej    68: struct inpcb *udp_last_inpcb = &udb;
                     69:
                     70: static void udp_detach __P((struct inpcb *));
                     71: static void udp_notify __P((struct inpcb *, int));
                     72: static struct mbuf *udp_saveopt __P((caddr_t, int, int));
1.1       cgd        73:
1.1.1.2   thorpej    74: void
                     75: udp_init()
                     76: {
                     77:        udb.inp_next = udb.inp_prev = &udb;
                     78: }
                     79:
                     80: void
1.1       cgd        81: udp_input(m, iphlen)
                     82:        register struct mbuf *m;
                     83:        int iphlen;
                     84: {
                     85:        register struct ip *ip;
                     86:        register struct udphdr *uh;
                     87:        register struct inpcb *inp;
                     88:        struct mbuf *opts = 0;
                     89:        int len;
                     90:        struct ip save_ip;
                     91:
                     92:        udpstat.udps_ipackets++;
                     93:
                     94:        /*
                     95:         * Strip IP options, if any; should skip this,
                     96:         * make available to user, and use on returned packets,
                     97:         * but we don't yet have a way to check the checksum
                     98:         * with options still present.
                     99:         */
                    100:        if (iphlen > sizeof (struct ip)) {
                    101:                ip_stripoptions(m, (struct mbuf *)0);
                    102:                iphlen = sizeof(struct ip);
                    103:        }
                    104:
                    105:        /*
                    106:         * Get IP and UDP header together in first mbuf.
                    107:         */
                    108:        ip = mtod(m, struct ip *);
                    109:        if (m->m_len < iphlen + sizeof(struct udphdr)) {
                    110:                if ((m = m_pullup(m, iphlen + sizeof(struct udphdr))) == 0) {
                    111:                        udpstat.udps_hdrops++;
                    112:                        return;
                    113:                }
                    114:                ip = mtod(m, struct ip *);
                    115:        }
                    116:        uh = (struct udphdr *)((caddr_t)ip + iphlen);
                    117:
                    118:        /*
                    119:         * Make mbuf data length reflect UDP length.
                    120:         * If not enough data to reflect UDP length, drop.
                    121:         */
                    122:        len = ntohs((u_short)uh->uh_ulen);
                    123:        if (ip->ip_len != len) {
                    124:                if (len > ip->ip_len) {
                    125:                        udpstat.udps_badlen++;
                    126:                        goto bad;
                    127:                }
                    128:                m_adj(m, len - ip->ip_len);
                    129:                /* ip->ip_len = len; */
                    130:        }
                    131:        /*
                    132:         * Save a copy of the IP header in case we want restore it
                    133:         * for sending an ICMP error message in response.
                    134:         */
                    135:        save_ip = *ip;
                    136:
                    137:        /*
                    138:         * Checksum extended UDP header and data.
                    139:         */
1.1.1.3 ! thorpej   140:        if (uh->uh_sum) {
1.1       cgd       141:                ((struct ipovly *)ip)->ih_next = 0;
                    142:                ((struct ipovly *)ip)->ih_prev = 0;
                    143:                ((struct ipovly *)ip)->ih_x1 = 0;
                    144:                ((struct ipovly *)ip)->ih_len = uh->uh_ulen;
                    145:                if (uh->uh_sum = in_cksum(m, len + sizeof (struct ip))) {
                    146:                        udpstat.udps_badsum++;
                    147:                        m_freem(m);
                    148:                        return;
                    149:                }
                    150:        }
                    151:
1.1.1.2   thorpej   152:        if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) ||
                    153:            in_broadcast(ip->ip_dst, m->m_pkthdr.rcvif)) {
                    154:                struct socket *last;
                    155:                /*
                    156:                 * Deliver a multicast or broadcast datagram to *all* sockets
                    157:                 * for which the local and remote addresses and ports match
                    158:                 * those of the incoming datagram.  This allows more than
                    159:                 * one process to receive multi/broadcasts on the same port.
                    160:                 * (This really ought to be done for unicast datagrams as
                    161:                 * well, but that would cause problems with existing
                    162:                 * applications that open both address-specific sockets and
                    163:                 * a wildcard socket listening to the same port -- they would
                    164:                 * end up receiving duplicates of every unicast datagram.
                    165:                 * Those applications open the multiple sockets to overcome an
                    166:                 * inadequacy of the UDP socket interface, but for backwards
                    167:                 * compatibility we avoid the problem here rather than
                    168:                 * fixing the interface.  Maybe 4.5BSD will remedy this?)
                    169:                 */
                    170:
                    171:                /*
                    172:                 * Construct sockaddr format source address.
                    173:                 */
                    174:                udp_in.sin_port = uh->uh_sport;
                    175:                udp_in.sin_addr = ip->ip_src;
                    176:                m->m_len -= sizeof (struct udpiphdr);
                    177:                m->m_data += sizeof (struct udpiphdr);
                    178:                /*
                    179:                 * Locate pcb(s) for datagram.
                    180:                 * (Algorithm copied from raw_intr().)
                    181:                 */
                    182:                last = NULL;
                    183:                for (inp = udb.inp_next; inp != &udb; inp = inp->inp_next) {
                    184:                        if (inp->inp_lport != uh->uh_dport)
                    185:                                continue;
                    186:                        if (inp->inp_laddr.s_addr != INADDR_ANY) {
                    187:                                if (inp->inp_laddr.s_addr !=
                    188:                                    ip->ip_dst.s_addr)
                    189:                                        continue;
                    190:                        }
                    191:                        if (inp->inp_faddr.s_addr != INADDR_ANY) {
                    192:                                if (inp->inp_faddr.s_addr !=
                    193:                                    ip->ip_src.s_addr ||
                    194:                                    inp->inp_fport != uh->uh_sport)
                    195:                                        continue;
                    196:                        }
                    197:
                    198:                        if (last != NULL) {
                    199:                                struct mbuf *n;
                    200:
                    201:                                if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
                    202:                                        if (sbappendaddr(&last->so_rcv,
                    203:                                                (struct sockaddr *)&udp_in,
                    204:                                                n, (struct mbuf *)0) == 0) {
                    205:                                                m_freem(n);
                    206:                                                udpstat.udps_fullsock++;
                    207:                                        } else
                    208:                                                sorwakeup(last);
                    209:                                }
                    210:                        }
                    211:                        last = inp->inp_socket;
                    212:                        /*
                    213:                         * Don't look for additional matches if this one does
                    214:                         * not have either the SO_REUSEPORT or SO_REUSEADDR
                    215:                         * socket options set.  This heuristic avoids searching
                    216:                         * through all pcbs in the common case of a non-shared
                    217:                         * port.  It * assumes that an application will never
                    218:                         * clear these options after setting them.
                    219:                         */
                    220:                        if ((last->so_options&(SO_REUSEPORT|SO_REUSEADDR) == 0))
                    221:                                break;
                    222:                }
                    223:
                    224:                if (last == NULL) {
                    225:                        /*
                    226:                         * No matching pcb found; discard datagram.
                    227:                         * (No need to send an ICMP Port Unreachable
                    228:                         * for a broadcast or multicast datgram.)
                    229:                         */
                    230:                        udpstat.udps_noportbcast++;
                    231:                        goto bad;
                    232:                }
                    233:                if (sbappendaddr(&last->so_rcv, (struct sockaddr *)&udp_in,
                    234:                     m, (struct mbuf *)0) == 0) {
                    235:                        udpstat.udps_fullsock++;
                    236:                        goto bad;
                    237:                }
                    238:                sorwakeup(last);
                    239:                return;
                    240:        }
1.1       cgd       241:        /*
                    242:         * Locate pcb for datagram.
                    243:         */
                    244:        inp = udp_last_inpcb;
                    245:        if (inp->inp_lport != uh->uh_dport ||
                    246:            inp->inp_fport != uh->uh_sport ||
                    247:            inp->inp_faddr.s_addr != ip->ip_src.s_addr ||
                    248:            inp->inp_laddr.s_addr != ip->ip_dst.s_addr) {
                    249:                inp = in_pcblookup(&udb, ip->ip_src, uh->uh_sport,
                    250:                    ip->ip_dst, uh->uh_dport, INPLOOKUP_WILDCARD);
                    251:                if (inp)
                    252:                        udp_last_inpcb = inp;
                    253:                udpstat.udpps_pcbcachemiss++;
                    254:        }
                    255:        if (inp == 0) {
                    256:                udpstat.udps_noport++;
1.1.1.2   thorpej   257:                if (m->m_flags & (M_BCAST | M_MCAST)) {
1.1       cgd       258:                        udpstat.udps_noportbcast++;
                    259:                        goto bad;
                    260:                }
                    261:                *ip = save_ip;
                    262:                ip->ip_len += iphlen;
1.1.1.2   thorpej   263:                icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0);
1.1       cgd       264:                return;
                    265:        }
                    266:
                    267:        /*
                    268:         * Construct sockaddr format source address.
                    269:         * Stuff source address and datagram in user buffer.
                    270:         */
                    271:        udp_in.sin_port = uh->uh_sport;
                    272:        udp_in.sin_addr = ip->ip_src;
                    273:        if (inp->inp_flags & INP_CONTROLOPTS) {
                    274:                struct mbuf **mp = &opts;
                    275:
                    276:                if (inp->inp_flags & INP_RECVDSTADDR) {
                    277:                        *mp = udp_saveopt((caddr_t) &ip->ip_dst,
                    278:                            sizeof(struct in_addr), IP_RECVDSTADDR);
                    279:                        if (*mp)
                    280:                                mp = &(*mp)->m_next;
                    281:                }
                    282: #ifdef notyet
                    283:                /* options were tossed above */
                    284:                if (inp->inp_flags & INP_RECVOPTS) {
                    285:                        *mp = udp_saveopt((caddr_t) opts_deleted_above,
                    286:                            sizeof(struct in_addr), IP_RECVOPTS);
                    287:                        if (*mp)
                    288:                                mp = &(*mp)->m_next;
                    289:                }
                    290:                /* ip_srcroute doesn't do what we want here, need to fix */
                    291:                if (inp->inp_flags & INP_RECVRETOPTS) {
                    292:                        *mp = udp_saveopt((caddr_t) ip_srcroute(),
                    293:                            sizeof(struct in_addr), IP_RECVRETOPTS);
                    294:                        if (*mp)
                    295:                                mp = &(*mp)->m_next;
                    296:                }
                    297: #endif
                    298:        }
                    299:        iphlen += sizeof(struct udphdr);
                    300:        m->m_len -= iphlen;
                    301:        m->m_pkthdr.len -= iphlen;
                    302:        m->m_data += iphlen;
                    303:        if (sbappendaddr(&inp->inp_socket->so_rcv, (struct sockaddr *)&udp_in,
                    304:            m, opts) == 0) {
                    305:                udpstat.udps_fullsock++;
                    306:                goto bad;
                    307:        }
                    308:        sorwakeup(inp->inp_socket);
                    309:        return;
                    310: bad:
                    311:        m_freem(m);
                    312:        if (opts)
                    313:                m_freem(opts);
                    314: }
                    315:
                    316: /*
                    317:  * Create a "control" mbuf containing the specified data
                    318:  * with the specified type for presentation with a datagram.
                    319:  */
                    320: struct mbuf *
                    321: udp_saveopt(p, size, type)
                    322:        caddr_t p;
                    323:        register int size;
                    324:        int type;
                    325: {
                    326:        register struct cmsghdr *cp;
                    327:        struct mbuf *m;
                    328:
                    329:        if ((m = m_get(M_DONTWAIT, MT_CONTROL)) == NULL)
                    330:                return ((struct mbuf *) NULL);
                    331:        cp = (struct cmsghdr *) mtod(m, struct cmsghdr *);
1.1.1.2   thorpej   332:        bcopy(p, CMSG_DATA(cp), size);
1.1       cgd       333:        size += sizeof(*cp);
                    334:        m->m_len = size;
                    335:        cp->cmsg_len = size;
                    336:        cp->cmsg_level = IPPROTO_IP;
                    337:        cp->cmsg_type = type;
                    338:        return (m);
                    339: }
                    340:
                    341: /*
                    342:  * Notify a udp user of an asynchronous error;
                    343:  * just wake up so that he can collect error status.
                    344:  */
1.1.1.2   thorpej   345: static void
1.1       cgd       346: udp_notify(inp, errno)
                    347:        register struct inpcb *inp;
1.1.1.2   thorpej   348:        int errno;
1.1       cgd       349: {
                    350:        inp->inp_socket->so_error = errno;
                    351:        sorwakeup(inp->inp_socket);
                    352:        sowwakeup(inp->inp_socket);
                    353: }
                    354:
1.1.1.2   thorpej   355: void
1.1       cgd       356: udp_ctlinput(cmd, sa, ip)
                    357:        int cmd;
                    358:        struct sockaddr *sa;
                    359:        register struct ip *ip;
                    360: {
                    361:        register struct udphdr *uh;
                    362:        extern struct in_addr zeroin_addr;
                    363:        extern u_char inetctlerrmap[];
                    364:
1.1.1.2   thorpej   365:        if (!PRC_IS_REDIRECT(cmd) &&
                    366:            ((unsigned)cmd >= PRC_NCMDS || inetctlerrmap[cmd] == 0))
1.1       cgd       367:                return;
                    368:        if (ip) {
                    369:                uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2));
                    370:                in_pcbnotify(&udb, sa, uh->uh_dport, ip->ip_src, uh->uh_sport,
                    371:                        cmd, udp_notify);
                    372:        } else
                    373:                in_pcbnotify(&udb, sa, 0, zeroin_addr, 0, cmd, udp_notify);
                    374: }
                    375:
1.1.1.2   thorpej   376: int
1.1       cgd       377: udp_output(inp, m, addr, control)
                    378:        register struct inpcb *inp;
                    379:        register struct mbuf *m;
                    380:        struct mbuf *addr, *control;
                    381: {
                    382:        register struct udpiphdr *ui;
                    383:        register int len = m->m_pkthdr.len;
                    384:        struct in_addr laddr;
                    385:        int s, error = 0;
                    386:
                    387:        if (control)
                    388:                m_freem(control);               /* XXX */
                    389:
                    390:        if (addr) {
                    391:                laddr = inp->inp_laddr;
                    392:                if (inp->inp_faddr.s_addr != INADDR_ANY) {
                    393:                        error = EISCONN;
                    394:                        goto release;
                    395:                }
                    396:                /*
                    397:                 * Must block input while temporarily connected.
                    398:                 */
                    399:                s = splnet();
                    400:                error = in_pcbconnect(inp, addr);
                    401:                if (error) {
                    402:                        splx(s);
                    403:                        goto release;
                    404:                }
                    405:        } else {
                    406:                if (inp->inp_faddr.s_addr == INADDR_ANY) {
                    407:                        error = ENOTCONN;
                    408:                        goto release;
                    409:                }
                    410:        }
                    411:        /*
                    412:         * Calculate data length and get a mbuf
                    413:         * for UDP and IP headers.
                    414:         */
1.1.1.2   thorpej   415:        M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT);
                    416:        if (m == 0) {
                    417:                error = ENOBUFS;
                    418:                goto release;
                    419:        }
1.1       cgd       420:
                    421:        /*
                    422:         * Fill in mbuf with extended UDP header
                    423:         * and addresses and length put into network format.
                    424:         */
                    425:        ui = mtod(m, struct udpiphdr *);
                    426:        ui->ui_next = ui->ui_prev = 0;
                    427:        ui->ui_x1 = 0;
                    428:        ui->ui_pr = IPPROTO_UDP;
                    429:        ui->ui_len = htons((u_short)len + sizeof (struct udphdr));
                    430:        ui->ui_src = inp->inp_laddr;
                    431:        ui->ui_dst = inp->inp_faddr;
                    432:        ui->ui_sport = inp->inp_lport;
                    433:        ui->ui_dport = inp->inp_fport;
                    434:        ui->ui_ulen = ui->ui_len;
                    435:
                    436:        /*
                    437:         * Stuff checksum and output datagram.
                    438:         */
                    439:        ui->ui_sum = 0;
                    440:        if (udpcksum) {
                    441:            if ((ui->ui_sum = in_cksum(m, sizeof (struct udpiphdr) + len)) == 0)
                    442:                ui->ui_sum = 0xffff;
                    443:        }
                    444:        ((struct ip *)ui)->ip_len = sizeof (struct udpiphdr) + len;
                    445:        ((struct ip *)ui)->ip_ttl = inp->inp_ip.ip_ttl; /* XXX */
                    446:        ((struct ip *)ui)->ip_tos = inp->inp_ip.ip_tos; /* XXX */
                    447:        udpstat.udps_opackets++;
                    448:        error = ip_output(m, inp->inp_options, &inp->inp_route,
1.1.1.2   thorpej   449:            inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST),
                    450:            inp->inp_moptions);
1.1       cgd       451:
                    452:        if (addr) {
                    453:                in_pcbdisconnect(inp);
                    454:                inp->inp_laddr = laddr;
                    455:                splx(s);
                    456:        }
                    457:        return (error);
                    458:
                    459: release:
                    460:        m_freem(m);
                    461:        return (error);
                    462: }
                    463:
                    464: u_long udp_sendspace = 9216;           /* really max datagram size */
                    465: u_long udp_recvspace = 40 * (1024 + sizeof(struct sockaddr_in));
                    466:                                        /* 40 1K datagrams */
                    467:
                    468: /*ARGSUSED*/
1.1.1.2   thorpej   469: int
1.1       cgd       470: udp_usrreq(so, req, m, addr, control)
                    471:        struct socket *so;
                    472:        int req;
                    473:        struct mbuf *m, *addr, *control;
                    474: {
                    475:        struct inpcb *inp = sotoinpcb(so);
                    476:        int error = 0;
                    477:        int s;
                    478:
                    479:        if (req == PRU_CONTROL)
1.1.1.3 ! thorpej   480:                return (in_control(so, (u_long)m, (caddr_t)addr,
1.1       cgd       481:                        (struct ifnet *)control));
                    482:        if (inp == NULL && req != PRU_ATTACH) {
                    483:                error = EINVAL;
                    484:                goto release;
                    485:        }
                    486:        /*
                    487:         * Note: need to block udp_input while changing
                    488:         * the udp pcb queue and/or pcb addresses.
                    489:         */
                    490:        switch (req) {
                    491:
                    492:        case PRU_ATTACH:
                    493:                if (inp != NULL) {
                    494:                        error = EINVAL;
                    495:                        break;
                    496:                }
                    497:                s = splnet();
                    498:                error = in_pcballoc(so, &udb);
                    499:                splx(s);
                    500:                if (error)
                    501:                        break;
                    502:                error = soreserve(so, udp_sendspace, udp_recvspace);
                    503:                if (error)
                    504:                        break;
1.1.1.2   thorpej   505:                ((struct inpcb *) so->so_pcb)->inp_ip.ip_ttl = ip_defttl;
1.1       cgd       506:                break;
                    507:
                    508:        case PRU_DETACH:
                    509:                udp_detach(inp);
                    510:                break;
                    511:
                    512:        case PRU_BIND:
                    513:                s = splnet();
                    514:                error = in_pcbbind(inp, addr);
                    515:                splx(s);
                    516:                break;
                    517:
                    518:        case PRU_LISTEN:
                    519:                error = EOPNOTSUPP;
                    520:                break;
                    521:
                    522:        case PRU_CONNECT:
                    523:                if (inp->inp_faddr.s_addr != INADDR_ANY) {
                    524:                        error = EISCONN;
                    525:                        break;
                    526:                }
                    527:                s = splnet();
                    528:                error = in_pcbconnect(inp, addr);
                    529:                splx(s);
                    530:                if (error == 0)
                    531:                        soisconnected(so);
                    532:                break;
                    533:
                    534:        case PRU_CONNECT2:
                    535:                error = EOPNOTSUPP;
                    536:                break;
                    537:
                    538:        case PRU_ACCEPT:
                    539:                error = EOPNOTSUPP;
                    540:                break;
                    541:
                    542:        case PRU_DISCONNECT:
                    543:                if (inp->inp_faddr.s_addr == INADDR_ANY) {
                    544:                        error = ENOTCONN;
                    545:                        break;
                    546:                }
                    547:                s = splnet();
                    548:                in_pcbdisconnect(inp);
                    549:                inp->inp_laddr.s_addr = INADDR_ANY;
                    550:                splx(s);
                    551:                so->so_state &= ~SS_ISCONNECTED;                /* XXX */
                    552:                break;
                    553:
                    554:        case PRU_SHUTDOWN:
                    555:                socantsendmore(so);
                    556:                break;
                    557:
                    558:        case PRU_SEND:
                    559:                return (udp_output(inp, m, addr, control));
                    560:
                    561:        case PRU_ABORT:
                    562:                soisdisconnected(so);
                    563:                udp_detach(inp);
                    564:                break;
                    565:
                    566:        case PRU_SOCKADDR:
                    567:                in_setsockaddr(inp, addr);
                    568:                break;
                    569:
                    570:        case PRU_PEERADDR:
                    571:                in_setpeeraddr(inp, addr);
                    572:                break;
                    573:
                    574:        case PRU_SENSE:
                    575:                /*
                    576:                 * stat: don't bother with a blocksize.
                    577:                 */
                    578:                return (0);
                    579:
                    580:        case PRU_SENDOOB:
                    581:        case PRU_FASTTIMO:
                    582:        case PRU_SLOWTIMO:
                    583:        case PRU_PROTORCV:
                    584:        case PRU_PROTOSEND:
                    585:                error =  EOPNOTSUPP;
                    586:                break;
                    587:
                    588:        case PRU_RCVD:
                    589:        case PRU_RCVOOB:
                    590:                return (EOPNOTSUPP);    /* do not free mbuf's */
                    591:
                    592:        default:
                    593:                panic("udp_usrreq");
                    594:        }
                    595:
                    596: release:
                    597:        if (control) {
                    598:                printf("udp control data unexpectedly retained\n");
                    599:                m_freem(control);
                    600:        }
                    601:        if (m)
                    602:                m_freem(m);
                    603:        return (error);
                    604: }
                    605:
1.1.1.2   thorpej   606: static void
1.1       cgd       607: udp_detach(inp)
                    608:        struct inpcb *inp;
                    609: {
                    610:        int s = splnet();
                    611:
                    612:        if (inp == udp_last_inpcb)
                    613:                udp_last_inpcb = &udb;
                    614:        in_pcbdetach(inp);
                    615:        splx(s);
1.1.1.2   thorpej   616: }
                    617:
                    618: /*
                    619:  * Sysctl for udp variables.
                    620:  */
                    621: udp_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
                    622:        int *name;
                    623:        u_int namelen;
                    624:        void *oldp;
                    625:        size_t *oldlenp;
                    626:        void *newp;
                    627:        size_t newlen;
                    628: {
                    629:        /* All sysctl names at this level are terminal. */
                    630:        if (namelen != 1)
                    631:                return (ENOTDIR);
                    632:
                    633:        switch (name[0]) {
                    634:        case UDPCTL_CHECKSUM:
                    635:                return (sysctl_int(oldp, oldlenp, newp, newlen, &udpcksum));
                    636:        default:
                    637:                return (ENOPROTOOPT);
                    638:        }
                    639:        /* NOTREACHED */
1.1       cgd       640: }

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