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Annotation of src/sys/netinet/udp_usrreq.c, Revision 1.42

1.42    ! thorpej     1: /*     $NetBSD: udp_usrreq.c,v 1.41 1997/06/24 19:31:34 thorpej 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:  */
1.38      ws         37: #include "ipkdb.h"
1.1       cgd        38:
1.5       mycroft    39: #include <sys/param.h>
                     40: #include <sys/malloc.h>
                     41: #include <sys/mbuf.h>
                     42: #include <sys/protosw.h>
                     43: #include <sys/socket.h>
                     44: #include <sys/socketvar.h>
1.13      mycroft    45: #include <sys/errno.h>
1.5       mycroft    46: #include <sys/stat.h>
1.27      christos   47: #include <sys/systm.h>
                     48: #include <sys/proc.h>
                     49:
                     50: #include <vm/vm.h>
                     51: #include <sys/sysctl.h>
1.1       cgd        52:
1.5       mycroft    53: #include <net/if.h>
                     54: #include <net/route.h>
1.1       cgd        55:
1.5       mycroft    56: #include <netinet/in.h>
                     57: #include <netinet/in_systm.h>
1.15      cgd        58: #include <netinet/in_var.h>
1.5       mycroft    59: #include <netinet/ip.h>
                     60: #include <netinet/in_pcb.h>
                     61: #include <netinet/ip_var.h>
                     62: #include <netinet/ip_icmp.h>
                     63: #include <netinet/udp.h>
                     64: #include <netinet/udp_var.h>
1.1       cgd        65:
1.27      christos   66: #include <machine/stdarg.h>
                     67:
1.8       mycroft    68: /*
                     69:  * UDP protocol implementation.
                     70:  * Per RFC 768, August, 1980.
                     71:  */
                     72: #ifndef        COMPAT_42
                     73: int    udpcksum = 1;
                     74: #else
                     75: int    udpcksum = 0;           /* XXX */
                     76: #endif
                     77:
1.13      mycroft    78: static void udp_notify __P((struct inpcb *, int));
1.7       mycroft    79:
1.26      mycroft    80: #ifndef UDBHASHSIZE
                     81: #define        UDBHASHSIZE     128
                     82: #endif
                     83: int    udbhashsize = UDBHASHSIZE;
                     84:
1.7       mycroft    85: void
1.1       cgd        86: udp_init()
                     87: {
1.18      mycroft    88:
1.35      mycroft    89:        in_pcbinit(&udbtable, udbhashsize, udbhashsize);
1.1       cgd        90: }
                     91:
1.7       mycroft    92: void
1.27      christos   93: #if __STDC__
                     94: udp_input(struct mbuf *m, ...)
                     95: #else
                     96: udp_input(m, va_alist)
                     97:        struct mbuf *m;
                     98:        va_dcl
                     99: #endif
1.1       cgd       100: {
                    101:        register struct ip *ip;
                    102:        register struct udphdr *uh;
                    103:        register struct inpcb *inp;
                    104:        struct mbuf *opts = 0;
                    105:        int len;
                    106:        struct ip save_ip;
1.27      christos  107:        int iphlen;
                    108:        va_list ap;
1.34      mycroft   109:        struct sockaddr_in udpsrc;
1.27      christos  110:
                    111:        va_start(ap, m);
                    112:        iphlen = va_arg(ap, int);
                    113:        va_end(ap);
1.1       cgd       114:
                    115:        udpstat.udps_ipackets++;
                    116:
                    117:        /*
                    118:         * Strip IP options, if any; should skip this,
                    119:         * make available to user, and use on returned packets,
                    120:         * but we don't yet have a way to check the checksum
                    121:         * with options still present.
                    122:         */
                    123:        if (iphlen > sizeof (struct ip)) {
                    124:                ip_stripoptions(m, (struct mbuf *)0);
                    125:                iphlen = sizeof(struct ip);
                    126:        }
                    127:
                    128:        /*
                    129:         * Get IP and UDP header together in first mbuf.
                    130:         */
                    131:        ip = mtod(m, struct ip *);
                    132:        if (m->m_len < iphlen + sizeof(struct udphdr)) {
                    133:                if ((m = m_pullup(m, iphlen + sizeof(struct udphdr))) == 0) {
                    134:                        udpstat.udps_hdrops++;
                    135:                        return;
                    136:                }
                    137:                ip = mtod(m, struct ip *);
                    138:        }
                    139:        uh = (struct udphdr *)((caddr_t)ip + iphlen);
                    140:
                    141:        /*
                    142:         * Make mbuf data length reflect UDP length.
                    143:         * If not enough data to reflect UDP length, drop.
                    144:         */
1.15      cgd       145:        len = ntohs((u_int16_t)uh->uh_ulen);
1.1       cgd       146:        if (ip->ip_len != len) {
                    147:                if (len > ip->ip_len) {
                    148:                        udpstat.udps_badlen++;
                    149:                        goto bad;
                    150:                }
                    151:                m_adj(m, len - ip->ip_len);
                    152:                /* ip->ip_len = len; */
                    153:        }
                    154:        /*
                    155:         * Save a copy of the IP header in case we want restore it
                    156:         * for sending an ICMP error message in response.
                    157:         */
                    158:        save_ip = *ip;
                    159:
                    160:        /*
                    161:         * Checksum extended UDP header and data.
                    162:         */
1.29      mrg       163:        if (uh->uh_sum) {
1.25      cgd       164:                bzero(((struct ipovly *)ip)->ih_x1,
                    165:                    sizeof ((struct ipovly *)ip)->ih_x1);
1.1       cgd       166:                ((struct ipovly *)ip)->ih_len = uh->uh_ulen;
1.27      christos  167:                if ((uh->uh_sum = in_cksum(m, len + sizeof (struct ip))) != 0) {
1.1       cgd       168:                        udpstat.udps_badsum++;
                    169:                        m_freem(m);
                    170:                        return;
                    171:                }
                    172:        }
1.13      mycroft   173:
1.16      mycroft   174:        if (IN_MULTICAST(ip->ip_dst.s_addr) ||
1.13      mycroft   175:            in_broadcast(ip->ip_dst, m->m_pkthdr.rcvif)) {
1.40      thorpej   176:                struct inpcb *last;
1.4       hpeyerl   177:                /*
                    178:                 * Deliver a multicast or broadcast datagram to *all* sockets
                    179:                 * for which the local and remote addresses and ports match
                    180:                 * those of the incoming datagram.  This allows more than
                    181:                 * one process to receive multi/broadcasts on the same port.
                    182:                 * (This really ought to be done for unicast datagrams as
                    183:                 * well, but that would cause problems with existing
                    184:                 * applications that open both address-specific sockets and
                    185:                 * a wildcard socket listening to the same port -- they would
                    186:                 * end up receiving duplicates of every unicast datagram.
                    187:                 * Those applications open the multiple sockets to overcome an
                    188:                 * inadequacy of the UDP socket interface, but for backwards
                    189:                 * compatibility we avoid the problem here rather than
1.13      mycroft   190:                 * fixing the interface.  Maybe 4.5BSD will remedy this?)
1.4       hpeyerl   191:                 */
1.13      mycroft   192:
1.4       hpeyerl   193:                /*
                    194:                 * Construct sockaddr format source address.
                    195:                 */
1.34      mycroft   196:                udpsrc.sin_family = AF_INET;
                    197:                udpsrc.sin_len = sizeof(struct sockaddr_in);
1.36      mycroft   198:                udpsrc.sin_addr = ip->ip_src;
1.34      mycroft   199:                udpsrc.sin_port = uh->uh_sport;
1.36      mycroft   200:                bzero((caddr_t)udpsrc.sin_zero, sizeof(udpsrc.sin_zero));
1.34      mycroft   201:
1.4       hpeyerl   202:                m->m_len -= sizeof (struct udpiphdr);
                    203:                m->m_data += sizeof (struct udpiphdr);
                    204:                /*
                    205:                 * Locate pcb(s) for datagram.
                    206:                 * (Algorithm copied from raw_intr().)
                    207:                 */
                    208:                last = NULL;
1.22      cgd       209:                for (inp = udbtable.inpt_queue.cqh_first;
                    210:                    inp != (struct inpcb *)&udbtable.inpt_queue;
                    211:                    inp = inp->inp_queue.cqe_next) {
1.4       hpeyerl   212:                        if (inp->inp_lport != uh->uh_dport)
                    213:                                continue;
1.34      mycroft   214:                        if (!in_nullhost(inp->inp_laddr)) {
                    215:                                if (!in_hosteq(inp->inp_laddr, ip->ip_dst))
1.4       hpeyerl   216:                                        continue;
                    217:                        }
1.34      mycroft   218:                        if (!in_nullhost(inp->inp_faddr)) {
                    219:                                if (!in_hosteq(inp->inp_faddr, ip->ip_src) ||
1.4       hpeyerl   220:                                    inp->inp_fport != uh->uh_sport)
                    221:                                        continue;
                    222:                        }
                    223:
                    224:                        if (last != NULL) {
                    225:                                struct mbuf *n;
                    226:
                    227:                                if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
1.40      thorpej   228:                                        if (last->inp_flags & INP_CONTROLOPTS
                    229:                                            || last->inp_socket->so_options &
                    230:                                               SO_TIMESTAMP) {
                    231:                                                ip_savecontrol(last, &opts,
                    232:                                                    ip, n);
                    233:                                        }
                    234:                                        if (sbappendaddr(
                    235:                                            &last->inp_socket->so_rcv,
                    236:                                            sintosa(&udpsrc), n, opts) == 0) {
1.4       hpeyerl   237:                                                m_freem(n);
1.40      thorpej   238:                                                if (opts)
                    239:                                                        m_freem(opts);
1.13      mycroft   240:                                        } else
1.40      thorpej   241:                                                sorwakeup(last->inp_socket);
                    242:                                        opts = 0;
1.4       hpeyerl   243:                                }
                    244:                        }
1.40      thorpej   245:                        last = inp;
1.4       hpeyerl   246:                        /*
1.13      mycroft   247:                         * Don't look for additional matches if this one does
                    248:                         * not have either the SO_REUSEPORT or SO_REUSEADDR
                    249:                         * socket options set.  This heuristic avoids searching
                    250:                         * through all pcbs in the common case of a non-shared
                    251:                         * port.  It * assumes that an application will never
                    252:                         * clear these options after setting them.
1.4       hpeyerl   253:                         */
1.40      thorpej   254:                        if ((last->inp_socket->so_options &
                    255:                            (SO_REUSEPORT|SO_REUSEADDR)) == 0)
1.4       hpeyerl   256:                                break;
                    257:                }
1.6       mycroft   258:
1.4       hpeyerl   259:                if (last == NULL) {
                    260:                        /*
                    261:                         * No matching pcb found; discard datagram.
                    262:                         * (No need to send an ICMP Port Unreachable
                    263:                         * for a broadcast or multicast datgram.)
                    264:                         */
1.13      mycroft   265:                        udpstat.udps_noportbcast++;
1.4       hpeyerl   266:                        goto bad;
                    267:                }
1.40      thorpej   268:                if (last->inp_flags & INP_CONTROLOPTS ||
                    269:                    last->inp_socket->so_options & SO_TIMESTAMP)
                    270:                        ip_savecontrol(last, &opts, ip, m);
                    271:                if (sbappendaddr(&last->inp_socket->so_rcv,
                    272:                    sintosa(&udpsrc), m, opts) == 0) {
1.13      mycroft   273:                        udpstat.udps_fullsock++;
1.4       hpeyerl   274:                        goto bad;
1.13      mycroft   275:                }
1.40      thorpej   276:                sorwakeup(last->inp_socket);
1.4       hpeyerl   277:                return;
                    278:        }
1.1       cgd       279:        /*
                    280:         * Locate pcb for datagram.
                    281:         */
1.35      mycroft   282:        inp = in_pcblookup_connect(&udbtable, ip->ip_src, uh->uh_sport,
1.26      mycroft   283:            ip->ip_dst, uh->uh_dport);
                    284:        if (inp == 0) {
                    285:                ++udpstat.udps_pcbhashmiss;
1.35      mycroft   286:                inp = in_pcblookup_bind(&udbtable, ip->ip_dst, uh->uh_dport);
1.18      mycroft   287:                if (inp == 0) {
                    288:                        udpstat.udps_noport++;
                    289:                        if (m->m_flags & (M_BCAST | M_MCAST)) {
                    290:                                udpstat.udps_noportbcast++;
                    291:                                goto bad;
                    292:                        }
                    293:                        *ip = save_ip;
1.38      ws        294: #if NIPKDB > 0
                    295:                        if (checkipkdb(&ip->ip_src,
                    296:                                       uh->uh_sport,
                    297:                                       uh->uh_dport,
                    298:                                       m,
                    299:                                       iphlen + sizeof(struct udphdr),
                    300:                                       len - sizeof(struct udphdr)))
1.37      ws        301:                        /* It was a debugger connect packet, just drop it now */
                    302:                                goto bad;
                    303: #endif
1.18      mycroft   304:                        icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0);
                    305:                        return;
1.13      mycroft   306:                }
1.1       cgd       307:        }
                    308:
                    309:        /*
                    310:         * Construct sockaddr format source address.
                    311:         * Stuff source address and datagram in user buffer.
                    312:         */
1.34      mycroft   313:        udpsrc.sin_family = AF_INET;
                    314:        udpsrc.sin_len = sizeof(struct sockaddr_in);
1.36      mycroft   315:        udpsrc.sin_addr = ip->ip_src;
1.34      mycroft   316:        udpsrc.sin_port = uh->uh_sport;
1.36      mycroft   317:        bzero((caddr_t)udpsrc.sin_zero, sizeof(udpsrc.sin_zero));
1.34      mycroft   318:
1.40      thorpej   319:        if (inp->inp_flags & INP_CONTROLOPTS ||
                    320:            inp->inp_socket->so_options & SO_TIMESTAMP)
                    321:                ip_savecontrol(inp, &opts, ip, m);
1.1       cgd       322:        iphlen += sizeof(struct udphdr);
                    323:        m->m_len -= iphlen;
                    324:        m->m_pkthdr.len -= iphlen;
                    325:        m->m_data += iphlen;
1.34      mycroft   326:        if (sbappendaddr(&inp->inp_socket->so_rcv, sintosa(&udpsrc), m,
1.17      mycroft   327:            opts) == 0) {
1.1       cgd       328:                udpstat.udps_fullsock++;
                    329:                goto bad;
                    330:        }
                    331:        sorwakeup(inp->inp_socket);
                    332:        return;
                    333: bad:
                    334:        m_freem(m);
                    335:        if (opts)
                    336:                m_freem(opts);
                    337: }
                    338:
                    339: /*
                    340:  * Notify a udp user of an asynchronous error;
                    341:  * just wake up so that he can collect error status.
                    342:  */
1.7       mycroft   343: static void
1.1       cgd       344: udp_notify(inp, errno)
                    345:        register struct inpcb *inp;
1.7       mycroft   346:        int errno;
1.1       cgd       347: {
1.34      mycroft   348:
1.1       cgd       349:        inp->inp_socket->so_error = errno;
                    350:        sorwakeup(inp->inp_socket);
                    351:        sowwakeup(inp->inp_socket);
                    352: }
                    353:
1.27      christos  354: void *
                    355: udp_ctlinput(cmd, sa, v)
1.1       cgd       356:        int cmd;
                    357:        struct sockaddr *sa;
1.27      christos  358:        void *v;
1.1       cgd       359: {
1.27      christos  360:        register struct ip *ip = v;
1.1       cgd       361:        register struct udphdr *uh;
1.21      mycroft   362:        extern int inetctlerrmap[];
1.18      mycroft   363:        void (*notify) __P((struct inpcb *, int)) = udp_notify;
1.21      mycroft   364:        int errno;
1.1       cgd       365:
1.20      mycroft   366:        if ((unsigned)cmd >= PRC_NCMDS)
1.27      christos  367:                return NULL;
1.20      mycroft   368:        errno = inetctlerrmap[cmd];
1.18      mycroft   369:        if (PRC_IS_REDIRECT(cmd))
1.19      mycroft   370:                notify = in_rtchange, ip = 0;
1.18      mycroft   371:        else if (cmd == PRC_HOSTDEAD)
1.19      mycroft   372:                ip = 0;
1.23      cgd       373:        else if (errno == 0)
1.27      christos  374:                return NULL;
1.19      mycroft   375:        if (ip) {
1.1       cgd       376:                uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2));
1.34      mycroft   377:                in_pcbnotify(&udbtable, satosin(sa)->sin_addr, uh->uh_dport,
                    378:                    ip->ip_src, uh->uh_sport, errno, notify);
1.19      mycroft   379:        } else
1.34      mycroft   380:                in_pcbnotifyall(&udbtable, satosin(sa)->sin_addr, errno,
                    381:                    notify);
1.27      christos  382:        return NULL;
1.1       cgd       383: }
                    384:
1.7       mycroft   385: int
1.27      christos  386: #if __STDC__
                    387: udp_output(struct mbuf *m, ...)
                    388: #else
                    389: udp_output(m, va_alist)
                    390:        struct mbuf *m;
                    391:        va_dcl
                    392: #endif
                    393: {
1.1       cgd       394:        register struct inpcb *inp;
                    395:        register struct udpiphdr *ui;
                    396:        register int len = m->m_pkthdr.len;
1.31      mycroft   397:        int error = 0;
1.27      christos  398:        va_list ap;
                    399:
                    400:        va_start(ap, m);
                    401:        inp = va_arg(ap, struct inpcb *);
                    402:        va_end(ap);
1.1       cgd       403:
                    404:        /*
                    405:         * Calculate data length and get a mbuf
                    406:         * for UDP and IP headers.
                    407:         */
1.13      mycroft   408:        M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT);
                    409:        if (m == 0) {
                    410:                error = ENOBUFS;
1.39      thorpej   411:                goto release;
                    412:        }
                    413:
                    414:        /*
                    415:         * Compute the packet length of the IP header, and
                    416:         * punt if the length looks bogus.
                    417:         */
                    418:        if ((len + sizeof(struct udpiphdr)) > IP_MAXPACKET) {
                    419:                error = EMSGSIZE;
1.13      mycroft   420:                goto release;
                    421:        }
1.1       cgd       422:
                    423:        /*
                    424:         * Fill in mbuf with extended UDP header
                    425:         * and addresses and length put into network format.
                    426:         */
                    427:        ui = mtod(m, struct udpiphdr *);
1.25      cgd       428:        bzero(ui->ui_x1, sizeof ui->ui_x1);
1.1       cgd       429:        ui->ui_pr = IPPROTO_UDP;
1.15      cgd       430:        ui->ui_len = htons((u_int16_t)len + sizeof (struct udphdr));
1.1       cgd       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++;
1.31      mycroft   449:        return (ip_output(m, inp->inp_options, &inp->inp_route,
1.12      mycroft   450:            inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST),
1.31      mycroft   451:            inp->inp_moptions));
1.1       cgd       452:
                    453: release:
                    454:        m_freem(m);
                    455:        return (error);
                    456: }
                    457:
1.42    ! thorpej   458: int    udp_sendspace = 9216;           /* really max datagram size */
        !           459: int    udp_recvspace = 40 * (1024 + sizeof(struct sockaddr_in));
1.1       cgd       460:                                        /* 40 1K datagrams */
                    461:
                    462: /*ARGSUSED*/
1.7       mycroft   463: int
1.31      mycroft   464: udp_usrreq(so, req, m, nam, control, p)
1.1       cgd       465:        struct socket *so;
                    466:        int req;
1.31      mycroft   467:        struct mbuf *m, *nam, *control;
1.30      mycroft   468:        struct proc *p;
1.1       cgd       469: {
1.31      mycroft   470:        register struct inpcb *inp;
1.1       cgd       471:        int s;
1.31      mycroft   472:        register int error = 0;
1.1       cgd       473:
                    474:        if (req == PRU_CONTROL)
1.31      mycroft   475:                return (in_control(so, (long)m, (caddr_t)nam,
1.30      mycroft   476:                    (struct ifnet *)control, p));
1.31      mycroft   477:
                    478:        s = splsoftnet();
                    479:        inp = sotoinpcb(so);
1.32      mycroft   480: #ifdef DIAGNOSTIC
                    481:        if (req != PRU_SEND && req != PRU_SENDOOB && control)
                    482:                panic("udp_usrreq: unexpected control mbuf");
                    483: #endif
1.31      mycroft   484:        if (inp == 0 && req != PRU_ATTACH) {
                    485:                error = EINVAL;
                    486:                goto release;
                    487:        }
                    488:
1.1       cgd       489:        /*
                    490:         * Note: need to block udp_input while changing
                    491:         * the udp pcb queue and/or pcb addresses.
                    492:         */
                    493:        switch (req) {
                    494:
                    495:        case PRU_ATTACH:
1.31      mycroft   496:                if (inp != 0) {
                    497:                        error = EISCONN;
1.1       cgd       498:                        break;
                    499:                }
1.31      mycroft   500:                if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
                    501:                        error = soreserve(so, udp_sendspace, udp_recvspace);
                    502:                        if (error)
                    503:                                break;
                    504:                }
1.18      mycroft   505:                error = in_pcballoc(so, &udbtable);
1.1       cgd       506:                if (error)
                    507:                        break;
1.31      mycroft   508:                inp = sotoinpcb(so);
                    509:                inp->inp_ip.ip_ttl = ip_defttl;
1.1       cgd       510:                break;
                    511:
                    512:        case PRU_DETACH:
1.31      mycroft   513:                in_pcbdetach(inp);
1.1       cgd       514:                break;
                    515:
                    516:        case PRU_BIND:
1.31      mycroft   517:                error = in_pcbbind(inp, nam, p);
1.1       cgd       518:                break;
                    519:
                    520:        case PRU_LISTEN:
                    521:                error = EOPNOTSUPP;
                    522:                break;
                    523:
                    524:        case PRU_CONNECT:
1.31      mycroft   525:                error = in_pcbconnect(inp, nam);
                    526:                if (error)
1.1       cgd       527:                        break;
1.31      mycroft   528:                soisconnected(so);
1.1       cgd       529:                break;
                    530:
                    531:        case PRU_CONNECT2:
                    532:                error = EOPNOTSUPP;
                    533:                break;
                    534:
                    535:        case PRU_DISCONNECT:
1.31      mycroft   536:                /*soisdisconnected(so);*/
                    537:                so->so_state &= ~SS_ISCONNECTED;        /* XXX */
1.1       cgd       538:                in_pcbdisconnect(inp);
1.34      mycroft   539:                inp->inp_laddr = zeroin_addr;           /* XXX */
1.35      mycroft   540:                in_pcbstate(inp, INP_BOUND);            /* XXX */
1.1       cgd       541:                break;
                    542:
                    543:        case PRU_SHUTDOWN:
                    544:                socantsendmore(so);
                    545:                break;
                    546:
1.31      mycroft   547:        case PRU_RCVD:
                    548:                error = EOPNOTSUPP;
1.1       cgd       549:                break;
                    550:
1.31      mycroft   551:        case PRU_SEND:
1.32      mycroft   552:                if (control && control->m_len) {
                    553:                        m_freem(control);
                    554:                        m_freem(m);
                    555:                        error = EINVAL;
                    556:                        break;
                    557:                }
1.31      mycroft   558:        {
1.35      mycroft   559:                struct in_addr laddr;                   /* XXX */
1.1       cgd       560:
1.31      mycroft   561:                if (nam) {
1.35      mycroft   562:                        laddr = inp->inp_laddr;         /* XXX */
1.31      mycroft   563:                        if ((so->so_state & SS_ISCONNECTED) != 0) {
                    564:                                error = EISCONN;
1.32      mycroft   565:                                goto die;
1.31      mycroft   566:                        }
                    567:                        error = in_pcbconnect(inp, nam);
1.32      mycroft   568:                        if (error) {
                    569:                        die:
                    570:                                m_freem(m);
1.31      mycroft   571:                                break;
1.32      mycroft   572:                        }
1.31      mycroft   573:                } else {
                    574:                        if ((so->so_state & SS_ISCONNECTED) == 0) {
                    575:                                error = ENOTCONN;
1.32      mycroft   576:                                goto die;
1.31      mycroft   577:                        }
                    578:                }
1.33      mycroft   579:                error = udp_output(m, inp);
1.31      mycroft   580:                if (nam) {
                    581:                        in_pcbdisconnect(inp);
1.35      mycroft   582:                        inp->inp_laddr = laddr;         /* XXX */
                    583:                        in_pcbstate(inp, INP_BOUND);    /* XXX */
1.31      mycroft   584:                }
                    585:        }
1.1       cgd       586:                break;
                    587:
                    588:        case PRU_SENSE:
                    589:                /*
                    590:                 * stat: don't bother with a blocksize.
                    591:                 */
1.31      mycroft   592:                splx(s);
1.1       cgd       593:                return (0);
                    594:
1.31      mycroft   595:        case PRU_RCVOOB:
                    596:                error =  EOPNOTSUPP;
                    597:                break;
                    598:
1.1       cgd       599:        case PRU_SENDOOB:
1.32      mycroft   600:                m_freem(control);
1.31      mycroft   601:                m_freem(m);
1.1       cgd       602:                error =  EOPNOTSUPP;
                    603:                break;
                    604:
1.31      mycroft   605:        case PRU_SOCKADDR:
                    606:                in_setsockaddr(inp, nam);
                    607:                break;
                    608:
                    609:        case PRU_PEERADDR:
                    610:                in_setpeeraddr(inp, nam);
                    611:                break;
1.1       cgd       612:
                    613:        default:
                    614:                panic("udp_usrreq");
                    615:        }
                    616:
                    617: release:
1.31      mycroft   618:        splx(s);
1.1       cgd       619:        return (error);
1.13      mycroft   620: }
                    621:
                    622: /*
                    623:  * Sysctl for udp variables.
                    624:  */
1.27      christos  625: int
1.13      mycroft   626: udp_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
                    627:        int *name;
                    628:        u_int namelen;
                    629:        void *oldp;
                    630:        size_t *oldlenp;
                    631:        void *newp;
                    632:        size_t newlen;
                    633: {
                    634:        /* All sysctl names at this level are terminal. */
                    635:        if (namelen != 1)
                    636:                return (ENOTDIR);
                    637:
                    638:        switch (name[0]) {
                    639:        case UDPCTL_CHECKSUM:
                    640:                return (sysctl_int(oldp, oldlenp, newp, newlen, &udpcksum));
1.42    ! thorpej   641:        case UDPCTL_SENDSPACE:
        !           642:                return (sysctl_int(oldp, oldlenp, newp, newlen,
        !           643:                    &udp_sendspace));
        !           644:        case UDPCTL_RECVSPACE:
        !           645:                return (sysctl_int(oldp, oldlenp, newp, newlen,
        !           646:                    &udp_recvspace));
1.13      mycroft   647:        default:
                    648:                return (ENOPROTOOPT);
                    649:        }
                    650:        /* NOTREACHED */
1.1       cgd       651: }

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