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Annotation of src/sys/netinet/udp_usrreq.c, Revision 1.35

1.35    ! mycroft     1: /*     $NetBSD: udp_usrreq.c,v 1.34 1996/09/09 14:51:23 mycroft Exp $  */
1.14      cgd         2:
1.1       cgd         3: /*
1.13      mycroft     4:  * Copyright (c) 1982, 1986, 1988, 1990, 1993
                      5:  *     The Regents of the University of California.  All rights reserved.
1.1       cgd         6:  *
                      7:  * Redistribution and use in source and binary forms, with or without
                      8:  * modification, are permitted provided that the following conditions
                      9:  * are met:
                     10:  * 1. Redistributions of source code must retain the above copyright
                     11:  *    notice, this list of conditions and the following disclaimer.
                     12:  * 2. Redistributions in binary form must reproduce the above copyright
                     13:  *    notice, this list of conditions and the following disclaimer in the
                     14:  *    documentation and/or other materials provided with the distribution.
                     15:  * 3. All advertising materials mentioning features or use of this software
                     16:  *    must display the following acknowledgement:
                     17:  *     This product includes software developed by the University of
                     18:  *     California, Berkeley and its contributors.
                     19:  * 4. Neither the name of the University nor the names of its contributors
                     20:  *    may be used to endorse or promote products derived from this software
                     21:  *    without specific prior written permission.
                     22:  *
                     23:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     24:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     25:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     26:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     27:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     28:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     29:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     30:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     31:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     32:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     33:  * SUCH DAMAGE.
                     34:  *
1.14      cgd        35:  *     @(#)udp_usrreq.c        8.4 (Berkeley) 1/21/94
1.1       cgd        36:  */
                     37:
1.5       mycroft    38: #include <sys/param.h>
                     39: #include <sys/malloc.h>
                     40: #include <sys/mbuf.h>
                     41: #include <sys/protosw.h>
                     42: #include <sys/socket.h>
                     43: #include <sys/socketvar.h>
1.13      mycroft    44: #include <sys/errno.h>
1.5       mycroft    45: #include <sys/stat.h>
1.27      christos   46: #include <sys/systm.h>
                     47: #include <sys/proc.h>
                     48:
                     49: #include <vm/vm.h>
                     50: #include <sys/sysctl.h>
1.1       cgd        51:
1.5       mycroft    52: #include <net/if.h>
                     53: #include <net/route.h>
1.1       cgd        54:
1.5       mycroft    55: #include <netinet/in.h>
                     56: #include <netinet/in_systm.h>
1.15      cgd        57: #include <netinet/in_var.h>
1.5       mycroft    58: #include <netinet/ip.h>
                     59: #include <netinet/in_pcb.h>
                     60: #include <netinet/ip_var.h>
                     61: #include <netinet/ip_icmp.h>
                     62: #include <netinet/udp.h>
                     63: #include <netinet/udp_var.h>
1.1       cgd        64:
1.27      christos   65: #include <machine/stdarg.h>
                     66:
1.8       mycroft    67: /*
                     68:  * UDP protocol implementation.
                     69:  * Per RFC 768, August, 1980.
                     70:  */
                     71: #ifndef        COMPAT_42
                     72: int    udpcksum = 1;
                     73: #else
                     74: int    udpcksum = 0;           /* XXX */
                     75: #endif
                     76:
1.13      mycroft    77: static void udp_notify __P((struct inpcb *, int));
                     78: static struct mbuf *udp_saveopt __P((caddr_t, int, 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)) {
1.4       hpeyerl   176:                struct socket *last;
                    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);
                    198:                udpsrc.sin_port = uh->uh_sport;
                    199:                udpsrc.sin_addr = ip->ip_src;
                    200:
1.4       hpeyerl   201:                m->m_len -= sizeof (struct udpiphdr);
                    202:                m->m_data += sizeof (struct udpiphdr);
                    203:                /*
                    204:                 * Locate pcb(s) for datagram.
                    205:                 * (Algorithm copied from raw_intr().)
                    206:                 */
                    207:                last = NULL;
1.22      cgd       208:                for (inp = udbtable.inpt_queue.cqh_first;
                    209:                    inp != (struct inpcb *)&udbtable.inpt_queue;
                    210:                    inp = inp->inp_queue.cqe_next) {
1.4       hpeyerl   211:                        if (inp->inp_lport != uh->uh_dport)
                    212:                                continue;
1.34      mycroft   213:                        if (!in_nullhost(inp->inp_laddr)) {
                    214:                                if (!in_hosteq(inp->inp_laddr, ip->ip_dst))
1.4       hpeyerl   215:                                        continue;
                    216:                        }
1.34      mycroft   217:                        if (!in_nullhost(inp->inp_faddr)) {
                    218:                                if (!in_hosteq(inp->inp_faddr, ip->ip_src) ||
1.4       hpeyerl   219:                                    inp->inp_fport != uh->uh_sport)
                    220:                                        continue;
                    221:                        }
                    222:
                    223:                        if (last != NULL) {
                    224:                                struct mbuf *n;
                    225:
                    226:                                if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
                    227:                                        if (sbappendaddr(&last->so_rcv,
1.34      mycroft   228:                                                sintosa(&udpsrc), n,
1.17      mycroft   229:                                                (struct mbuf *)0) == 0) {
1.4       hpeyerl   230:                                                m_freem(n);
1.13      mycroft   231:                                                udpstat.udps_fullsock++;
                    232:                                        } else
1.4       hpeyerl   233:                                                sorwakeup(last);
                    234:                                }
                    235:                        }
                    236:                        last = inp->inp_socket;
                    237:                        /*
1.13      mycroft   238:                         * Don't look for additional matches if this one does
                    239:                         * not have either the SO_REUSEPORT or SO_REUSEADDR
                    240:                         * socket options set.  This heuristic avoids searching
                    241:                         * through all pcbs in the common case of a non-shared
                    242:                         * port.  It * assumes that an application will never
                    243:                         * clear these options after setting them.
1.4       hpeyerl   244:                         */
1.28      christos  245:                        if ((last->so_options&(SO_REUSEPORT|SO_REUSEADDR)) == 0)
1.4       hpeyerl   246:                                break;
                    247:                }
1.6       mycroft   248:
1.4       hpeyerl   249:                if (last == NULL) {
                    250:                        /*
                    251:                         * No matching pcb found; discard datagram.
                    252:                         * (No need to send an ICMP Port Unreachable
                    253:                         * for a broadcast or multicast datgram.)
                    254:                         */
1.13      mycroft   255:                        udpstat.udps_noportbcast++;
1.4       hpeyerl   256:                        goto bad;
                    257:                }
1.34      mycroft   258:                if (sbappendaddr(&last->so_rcv, sintosa(&udpsrc), m,
1.17      mycroft   259:                    (struct mbuf *)0) == 0) {
1.13      mycroft   260:                        udpstat.udps_fullsock++;
1.4       hpeyerl   261:                        goto bad;
1.13      mycroft   262:                }
1.4       hpeyerl   263:                sorwakeup(last);
                    264:                return;
                    265:        }
1.1       cgd       266:        /*
                    267:         * Locate pcb for datagram.
                    268:         */
1.35    ! mycroft   269:        inp = in_pcblookup_connect(&udbtable, ip->ip_src, uh->uh_sport,
1.26      mycroft   270:            ip->ip_dst, uh->uh_dport);
                    271:        if (inp == 0) {
                    272:                ++udpstat.udps_pcbhashmiss;
1.35    ! mycroft   273:                inp = in_pcblookup_bind(&udbtable, ip->ip_dst, uh->uh_dport);
1.18      mycroft   274:                if (inp == 0) {
                    275:                        udpstat.udps_noport++;
                    276:                        if (m->m_flags & (M_BCAST | M_MCAST)) {
                    277:                                udpstat.udps_noportbcast++;
                    278:                                goto bad;
                    279:                        }
                    280:                        *ip = save_ip;
                    281:                        ip->ip_len += iphlen;
                    282:                        icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0);
                    283:                        return;
1.13      mycroft   284:                }
1.1       cgd       285:        }
                    286:
                    287:        /*
                    288:         * Construct sockaddr format source address.
                    289:         * Stuff source address and datagram in user buffer.
                    290:         */
1.34      mycroft   291:        udpsrc.sin_family = AF_INET;
                    292:        udpsrc.sin_len = sizeof(struct sockaddr_in);
                    293:        udpsrc.sin_port = uh->uh_sport;
                    294:        udpsrc.sin_addr = ip->ip_src;
                    295:
1.1       cgd       296:        if (inp->inp_flags & INP_CONTROLOPTS) {
                    297:                struct mbuf **mp = &opts;
                    298:
                    299:                if (inp->inp_flags & INP_RECVDSTADDR) {
                    300:                        *mp = udp_saveopt((caddr_t) &ip->ip_dst,
                    301:                            sizeof(struct in_addr), IP_RECVDSTADDR);
                    302:                        if (*mp)
                    303:                                mp = &(*mp)->m_next;
                    304:                }
                    305: #ifdef notyet
                    306:                /* options were tossed above */
                    307:                if (inp->inp_flags & INP_RECVOPTS) {
                    308:                        *mp = udp_saveopt((caddr_t) opts_deleted_above,
                    309:                            sizeof(struct in_addr), IP_RECVOPTS);
                    310:                        if (*mp)
                    311:                                mp = &(*mp)->m_next;
                    312:                }
                    313:                /* ip_srcroute doesn't do what we want here, need to fix */
                    314:                if (inp->inp_flags & INP_RECVRETOPTS) {
                    315:                        *mp = udp_saveopt((caddr_t) ip_srcroute(),
                    316:                            sizeof(struct in_addr), IP_RECVRETOPTS);
                    317:                        if (*mp)
                    318:                                mp = &(*mp)->m_next;
                    319:                }
                    320: #endif
                    321:        }
                    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:  * Create a "control" mbuf containing the specified data
                    341:  * with the specified type for presentation with a datagram.
                    342:  */
1.13      mycroft   343: struct mbuf *
1.1       cgd       344: udp_saveopt(p, size, type)
                    345:        caddr_t p;
                    346:        register int size;
                    347:        int type;
                    348: {
                    349:        register struct cmsghdr *cp;
                    350:        struct mbuf *m;
                    351:
                    352:        if ((m = m_get(M_DONTWAIT, MT_CONTROL)) == NULL)
                    353:                return ((struct mbuf *) NULL);
                    354:        cp = (struct cmsghdr *) mtod(m, struct cmsghdr *);
1.13      mycroft   355:        bcopy(p, CMSG_DATA(cp), size);
1.1       cgd       356:        size += sizeof(*cp);
                    357:        m->m_len = size;
                    358:        cp->cmsg_len = size;
                    359:        cp->cmsg_level = IPPROTO_IP;
                    360:        cp->cmsg_type = type;
                    361:        return (m);
                    362: }
                    363:
                    364: /*
                    365:  * Notify a udp user of an asynchronous error;
                    366:  * just wake up so that he can collect error status.
                    367:  */
1.7       mycroft   368: static void
1.1       cgd       369: udp_notify(inp, errno)
                    370:        register struct inpcb *inp;
1.7       mycroft   371:        int errno;
1.1       cgd       372: {
1.34      mycroft   373:
1.1       cgd       374:        inp->inp_socket->so_error = errno;
                    375:        sorwakeup(inp->inp_socket);
                    376:        sowwakeup(inp->inp_socket);
                    377: }
                    378:
1.27      christos  379: void *
                    380: udp_ctlinput(cmd, sa, v)
1.1       cgd       381:        int cmd;
                    382:        struct sockaddr *sa;
1.27      christos  383:        void *v;
1.1       cgd       384: {
1.27      christos  385:        register struct ip *ip = v;
1.1       cgd       386:        register struct udphdr *uh;
1.21      mycroft   387:        extern int inetctlerrmap[];
1.18      mycroft   388:        void (*notify) __P((struct inpcb *, int)) = udp_notify;
1.21      mycroft   389:        int errno;
1.1       cgd       390:
1.20      mycroft   391:        if ((unsigned)cmd >= PRC_NCMDS)
1.27      christos  392:                return NULL;
1.20      mycroft   393:        errno = inetctlerrmap[cmd];
1.18      mycroft   394:        if (PRC_IS_REDIRECT(cmd))
1.19      mycroft   395:                notify = in_rtchange, ip = 0;
1.18      mycroft   396:        else if (cmd == PRC_HOSTDEAD)
1.19      mycroft   397:                ip = 0;
1.23      cgd       398:        else if (errno == 0)
1.27      christos  399:                return NULL;
1.19      mycroft   400:        if (ip) {
1.1       cgd       401:                uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2));
1.34      mycroft   402:                in_pcbnotify(&udbtable, satosin(sa)->sin_addr, uh->uh_dport,
                    403:                    ip->ip_src, uh->uh_sport, errno, notify);
1.19      mycroft   404:        } else
1.34      mycroft   405:                in_pcbnotifyall(&udbtable, satosin(sa)->sin_addr, errno,
                    406:                    notify);
1.27      christos  407:        return NULL;
1.1       cgd       408: }
                    409:
1.7       mycroft   410: int
1.27      christos  411: #if __STDC__
                    412: udp_output(struct mbuf *m, ...)
                    413: #else
                    414: udp_output(m, va_alist)
                    415:        struct mbuf *m;
                    416:        va_dcl
                    417: #endif
                    418: {
1.1       cgd       419:        register struct inpcb *inp;
                    420:        register struct udpiphdr *ui;
                    421:        register int len = m->m_pkthdr.len;
1.31      mycroft   422:        int error = 0;
1.27      christos  423:        va_list ap;
                    424:
                    425:        va_start(ap, m);
                    426:        inp = va_arg(ap, struct inpcb *);
                    427:        va_end(ap);
1.1       cgd       428:
                    429:        /*
                    430:         * Calculate data length and get a mbuf
                    431:         * for UDP and IP headers.
                    432:         */
1.13      mycroft   433:        M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT);
                    434:        if (m == 0) {
                    435:                error = ENOBUFS;
                    436:                goto release;
                    437:        }
1.1       cgd       438:
                    439:        /*
                    440:         * Fill in mbuf with extended UDP header
                    441:         * and addresses and length put into network format.
                    442:         */
                    443:        ui = mtod(m, struct udpiphdr *);
1.25      cgd       444:        bzero(ui->ui_x1, sizeof ui->ui_x1);
1.1       cgd       445:        ui->ui_pr = IPPROTO_UDP;
1.15      cgd       446:        ui->ui_len = htons((u_int16_t)len + sizeof (struct udphdr));
1.1       cgd       447:        ui->ui_src = inp->inp_laddr;
                    448:        ui->ui_dst = inp->inp_faddr;
                    449:        ui->ui_sport = inp->inp_lport;
                    450:        ui->ui_dport = inp->inp_fport;
                    451:        ui->ui_ulen = ui->ui_len;
                    452:
                    453:        /*
                    454:         * Stuff checksum and output datagram.
                    455:         */
                    456:        ui->ui_sum = 0;
                    457:        if (udpcksum) {
                    458:            if ((ui->ui_sum = in_cksum(m, sizeof (struct udpiphdr) + len)) == 0)
                    459:                ui->ui_sum = 0xffff;
                    460:        }
                    461:        ((struct ip *)ui)->ip_len = sizeof (struct udpiphdr) + len;
                    462:        ((struct ip *)ui)->ip_ttl = inp->inp_ip.ip_ttl; /* XXX */
                    463:        ((struct ip *)ui)->ip_tos = inp->inp_ip.ip_tos; /* XXX */
                    464:        udpstat.udps_opackets++;
1.31      mycroft   465:        return (ip_output(m, inp->inp_options, &inp->inp_route,
1.12      mycroft   466:            inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST),
1.31      mycroft   467:            inp->inp_moptions));
1.1       cgd       468:
                    469: release:
                    470:        m_freem(m);
                    471:        return (error);
                    472: }
                    473:
                    474: u_long udp_sendspace = 9216;           /* really max datagram size */
                    475: u_long udp_recvspace = 40 * (1024 + sizeof(struct sockaddr_in));
                    476:                                        /* 40 1K datagrams */
                    477:
                    478: /*ARGSUSED*/
1.7       mycroft   479: int
1.31      mycroft   480: udp_usrreq(so, req, m, nam, control, p)
1.1       cgd       481:        struct socket *so;
                    482:        int req;
1.31      mycroft   483:        struct mbuf *m, *nam, *control;
1.30      mycroft   484:        struct proc *p;
1.1       cgd       485: {
1.31      mycroft   486:        register struct inpcb *inp;
1.1       cgd       487:        int s;
1.31      mycroft   488:        register int error = 0;
1.1       cgd       489:
                    490:        if (req == PRU_CONTROL)
1.31      mycroft   491:                return (in_control(so, (long)m, (caddr_t)nam,
1.30      mycroft   492:                    (struct ifnet *)control, p));
1.31      mycroft   493:
                    494:        s = splsoftnet();
                    495:        inp = sotoinpcb(so);
1.32      mycroft   496: #ifdef DIAGNOSTIC
                    497:        if (req != PRU_SEND && req != PRU_SENDOOB && control)
                    498:                panic("udp_usrreq: unexpected control mbuf");
                    499: #endif
1.31      mycroft   500:        if (inp == 0 && req != PRU_ATTACH) {
                    501:                error = EINVAL;
                    502:                goto release;
                    503:        }
                    504:
1.1       cgd       505:        /*
                    506:         * Note: need to block udp_input while changing
                    507:         * the udp pcb queue and/or pcb addresses.
                    508:         */
                    509:        switch (req) {
                    510:
                    511:        case PRU_ATTACH:
1.31      mycroft   512:                if (inp != 0) {
                    513:                        error = EISCONN;
1.1       cgd       514:                        break;
                    515:                }
1.31      mycroft   516:                if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
                    517:                        error = soreserve(so, udp_sendspace, udp_recvspace);
                    518:                        if (error)
                    519:                                break;
                    520:                }
1.18      mycroft   521:                error = in_pcballoc(so, &udbtable);
1.1       cgd       522:                if (error)
                    523:                        break;
1.31      mycroft   524:                inp = sotoinpcb(so);
                    525:                inp->inp_ip.ip_ttl = ip_defttl;
1.1       cgd       526:                break;
                    527:
                    528:        case PRU_DETACH:
1.31      mycroft   529:                in_pcbdetach(inp);
1.1       cgd       530:                break;
                    531:
                    532:        case PRU_BIND:
1.31      mycroft   533:                error = in_pcbbind(inp, nam, p);
1.1       cgd       534:                break;
                    535:
                    536:        case PRU_LISTEN:
                    537:                error = EOPNOTSUPP;
                    538:                break;
                    539:
                    540:        case PRU_CONNECT:
1.31      mycroft   541:                error = in_pcbconnect(inp, nam);
                    542:                if (error)
1.1       cgd       543:                        break;
1.31      mycroft   544:                soisconnected(so);
1.1       cgd       545:                break;
                    546:
                    547:        case PRU_CONNECT2:
                    548:                error = EOPNOTSUPP;
                    549:                break;
                    550:
                    551:        case PRU_DISCONNECT:
1.31      mycroft   552:                /*soisdisconnected(so);*/
                    553:                so->so_state &= ~SS_ISCONNECTED;        /* XXX */
1.1       cgd       554:                in_pcbdisconnect(inp);
1.34      mycroft   555:                inp->inp_laddr = zeroin_addr;           /* XXX */
1.35    ! mycroft   556:                in_pcbstate(inp, INP_BOUND);            /* XXX */
1.1       cgd       557:                break;
                    558:
                    559:        case PRU_SHUTDOWN:
                    560:                socantsendmore(so);
                    561:                break;
                    562:
1.31      mycroft   563:        case PRU_RCVD:
                    564:                error = EOPNOTSUPP;
1.1       cgd       565:                break;
                    566:
1.31      mycroft   567:        case PRU_SEND:
1.32      mycroft   568:                if (control && control->m_len) {
                    569:                        m_freem(control);
                    570:                        m_freem(m);
                    571:                        error = EINVAL;
                    572:                        break;
                    573:                }
1.31      mycroft   574:        {
1.35    ! mycroft   575:                struct in_addr laddr;                   /* XXX */
1.1       cgd       576:
1.31      mycroft   577:                if (nam) {
1.35    ! mycroft   578:                        laddr = inp->inp_laddr;         /* XXX */
1.31      mycroft   579:                        if ((so->so_state & SS_ISCONNECTED) != 0) {
                    580:                                error = EISCONN;
1.32      mycroft   581:                                goto die;
1.31      mycroft   582:                        }
                    583:                        error = in_pcbconnect(inp, nam);
1.32      mycroft   584:                        if (error) {
                    585:                        die:
                    586:                                m_freem(m);
1.31      mycroft   587:                                break;
1.32      mycroft   588:                        }
1.31      mycroft   589:                } else {
                    590:                        if ((so->so_state & SS_ISCONNECTED) == 0) {
                    591:                                error = ENOTCONN;
1.32      mycroft   592:                                goto die;
1.31      mycroft   593:                        }
                    594:                }
1.33      mycroft   595:                error = udp_output(m, inp);
1.31      mycroft   596:                if (nam) {
                    597:                        in_pcbdisconnect(inp);
1.35    ! mycroft   598:                        inp->inp_laddr = laddr;         /* XXX */
        !           599:                        in_pcbstate(inp, INP_BOUND);    /* XXX */
1.31      mycroft   600:                }
                    601:        }
1.1       cgd       602:                break;
                    603:
                    604:        case PRU_SENSE:
                    605:                /*
                    606:                 * stat: don't bother with a blocksize.
                    607:                 */
1.31      mycroft   608:                splx(s);
1.1       cgd       609:                return (0);
                    610:
1.31      mycroft   611:        case PRU_RCVOOB:
                    612:                error =  EOPNOTSUPP;
                    613:                break;
                    614:
1.1       cgd       615:        case PRU_SENDOOB:
1.32      mycroft   616:                m_freem(control);
1.31      mycroft   617:                m_freem(m);
1.1       cgd       618:                error =  EOPNOTSUPP;
                    619:                break;
                    620:
1.31      mycroft   621:        case PRU_SOCKADDR:
                    622:                in_setsockaddr(inp, nam);
                    623:                break;
                    624:
                    625:        case PRU_PEERADDR:
                    626:                in_setpeeraddr(inp, nam);
                    627:                break;
1.1       cgd       628:
                    629:        default:
                    630:                panic("udp_usrreq");
                    631:        }
                    632:
                    633: release:
1.31      mycroft   634:        splx(s);
1.1       cgd       635:        return (error);
1.13      mycroft   636: }
                    637:
                    638: /*
                    639:  * Sysctl for udp variables.
                    640:  */
1.27      christos  641: int
1.13      mycroft   642: udp_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
                    643:        int *name;
                    644:        u_int namelen;
                    645:        void *oldp;
                    646:        size_t *oldlenp;
                    647:        void *newp;
                    648:        size_t newlen;
                    649: {
                    650:        /* All sysctl names at this level are terminal. */
                    651:        if (namelen != 1)
                    652:                return (ENOTDIR);
                    653:
                    654:        switch (name[0]) {
                    655:        case UDPCTL_CHECKSUM:
                    656:                return (sysctl_int(oldp, oldlenp, newp, newlen, &udpcksum));
                    657:        default:
                    658:                return (ENOPROTOOPT);
                    659:        }
                    660:        /* NOTREACHED */
1.1       cgd       661: }

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