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Annotation of src/sys/netinet/udp_usrreq.c, Revision 1.37

1.37    ! ws          1: /*     $NetBSD: udp_usrreq.c,v 1.36 1996/09/16 17:45:19 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:  */
1.37    ! ws         37: #include "kgdb.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));
                     79: static struct mbuf *udp_saveopt __P((caddr_t, int, int));
1.7       mycroft    80:
1.26      mycroft    81: #ifndef UDBHASHSIZE
                     82: #define        UDBHASHSIZE     128
                     83: #endif
                     84: int    udbhashsize = UDBHASHSIZE;
                     85:
1.7       mycroft    86: void
1.1       cgd        87: udp_init()
                     88: {
1.18      mycroft    89:
1.35      mycroft    90:        in_pcbinit(&udbtable, udbhashsize, udbhashsize);
1.1       cgd        91: }
                     92:
1.7       mycroft    93: void
1.27      christos   94: #if __STDC__
                     95: udp_input(struct mbuf *m, ...)
                     96: #else
                     97: udp_input(m, va_alist)
                     98:        struct mbuf *m;
                     99:        va_dcl
                    100: #endif
1.1       cgd       101: {
                    102:        register struct ip *ip;
                    103:        register struct udphdr *uh;
                    104:        register struct inpcb *inp;
                    105:        struct mbuf *opts = 0;
                    106:        int len;
                    107:        struct ip save_ip;
1.27      christos  108:        int iphlen;
                    109:        va_list ap;
1.34      mycroft   110:        struct sockaddr_in udpsrc;
1.27      christos  111:
                    112:        va_start(ap, m);
                    113:        iphlen = va_arg(ap, int);
                    114:        va_end(ap);
1.1       cgd       115:
                    116:        udpstat.udps_ipackets++;
                    117:
                    118:        /*
                    119:         * Strip IP options, if any; should skip this,
                    120:         * make available to user, and use on returned packets,
                    121:         * but we don't yet have a way to check the checksum
                    122:         * with options still present.
                    123:         */
                    124:        if (iphlen > sizeof (struct ip)) {
                    125:                ip_stripoptions(m, (struct mbuf *)0);
                    126:                iphlen = sizeof(struct ip);
                    127:        }
                    128:
                    129:        /*
                    130:         * Get IP and UDP header together in first mbuf.
                    131:         */
                    132:        ip = mtod(m, struct ip *);
                    133:        if (m->m_len < iphlen + sizeof(struct udphdr)) {
                    134:                if ((m = m_pullup(m, iphlen + sizeof(struct udphdr))) == 0) {
                    135:                        udpstat.udps_hdrops++;
                    136:                        return;
                    137:                }
                    138:                ip = mtod(m, struct ip *);
                    139:        }
                    140:        uh = (struct udphdr *)((caddr_t)ip + iphlen);
                    141:
                    142:        /*
                    143:         * Make mbuf data length reflect UDP length.
                    144:         * If not enough data to reflect UDP length, drop.
                    145:         */
1.15      cgd       146:        len = ntohs((u_int16_t)uh->uh_ulen);
1.1       cgd       147:        if (ip->ip_len != len) {
                    148:                if (len > ip->ip_len) {
                    149:                        udpstat.udps_badlen++;
                    150:                        goto bad;
                    151:                }
                    152:                m_adj(m, len - ip->ip_len);
                    153:                /* ip->ip_len = len; */
                    154:        }
                    155:        /*
                    156:         * Save a copy of the IP header in case we want restore it
                    157:         * for sending an ICMP error message in response.
                    158:         */
                    159:        save_ip = *ip;
                    160:
                    161:        /*
                    162:         * Checksum extended UDP header and data.
                    163:         */
1.29      mrg       164:        if (uh->uh_sum) {
1.25      cgd       165:                bzero(((struct ipovly *)ip)->ih_x1,
                    166:                    sizeof ((struct ipovly *)ip)->ih_x1);
1.1       cgd       167:                ((struct ipovly *)ip)->ih_len = uh->uh_ulen;
1.27      christos  168:                if ((uh->uh_sum = in_cksum(m, len + sizeof (struct ip))) != 0) {
1.1       cgd       169:                        udpstat.udps_badsum++;
                    170:                        m_freem(m);
                    171:                        return;
                    172:                }
                    173:        }
1.13      mycroft   174:
1.16      mycroft   175:        if (IN_MULTICAST(ip->ip_dst.s_addr) ||
1.13      mycroft   176:            in_broadcast(ip->ip_dst, m->m_pkthdr.rcvif)) {
1.4       hpeyerl   177:                struct socket *last;
                    178:                /*
                    179:                 * Deliver a multicast or broadcast datagram to *all* sockets
                    180:                 * for which the local and remote addresses and ports match
                    181:                 * those of the incoming datagram.  This allows more than
                    182:                 * one process to receive multi/broadcasts on the same port.
                    183:                 * (This really ought to be done for unicast datagrams as
                    184:                 * well, but that would cause problems with existing
                    185:                 * applications that open both address-specific sockets and
                    186:                 * a wildcard socket listening to the same port -- they would
                    187:                 * end up receiving duplicates of every unicast datagram.
                    188:                 * Those applications open the multiple sockets to overcome an
                    189:                 * inadequacy of the UDP socket interface, but for backwards
                    190:                 * compatibility we avoid the problem here rather than
1.13      mycroft   191:                 * fixing the interface.  Maybe 4.5BSD will remedy this?)
1.4       hpeyerl   192:                 */
1.13      mycroft   193:
1.4       hpeyerl   194:                /*
                    195:                 * Construct sockaddr format source address.
                    196:                 */
1.34      mycroft   197:                udpsrc.sin_family = AF_INET;
                    198:                udpsrc.sin_len = sizeof(struct sockaddr_in);
1.36      mycroft   199:                udpsrc.sin_addr = ip->ip_src;
1.34      mycroft   200:                udpsrc.sin_port = uh->uh_sport;
1.36      mycroft   201:                bzero((caddr_t)udpsrc.sin_zero, sizeof(udpsrc.sin_zero));
1.34      mycroft   202:
1.4       hpeyerl   203:                m->m_len -= sizeof (struct udpiphdr);
                    204:                m->m_data += sizeof (struct udpiphdr);
                    205:                /*
                    206:                 * Locate pcb(s) for datagram.
                    207:                 * (Algorithm copied from raw_intr().)
                    208:                 */
                    209:                last = NULL;
1.22      cgd       210:                for (inp = udbtable.inpt_queue.cqh_first;
                    211:                    inp != (struct inpcb *)&udbtable.inpt_queue;
                    212:                    inp = inp->inp_queue.cqe_next) {
1.4       hpeyerl   213:                        if (inp->inp_lport != uh->uh_dport)
                    214:                                continue;
1.34      mycroft   215:                        if (!in_nullhost(inp->inp_laddr)) {
                    216:                                if (!in_hosteq(inp->inp_laddr, ip->ip_dst))
1.4       hpeyerl   217:                                        continue;
                    218:                        }
1.34      mycroft   219:                        if (!in_nullhost(inp->inp_faddr)) {
                    220:                                if (!in_hosteq(inp->inp_faddr, ip->ip_src) ||
1.4       hpeyerl   221:                                    inp->inp_fport != uh->uh_sport)
                    222:                                        continue;
                    223:                        }
                    224:
                    225:                        if (last != NULL) {
                    226:                                struct mbuf *n;
                    227:
                    228:                                if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
                    229:                                        if (sbappendaddr(&last->so_rcv,
1.34      mycroft   230:                                                sintosa(&udpsrc), n,
1.17      mycroft   231:                                                (struct mbuf *)0) == 0) {
1.4       hpeyerl   232:                                                m_freem(n);
1.13      mycroft   233:                                                udpstat.udps_fullsock++;
                    234:                                        } else
1.4       hpeyerl   235:                                                sorwakeup(last);
                    236:                                }
                    237:                        }
                    238:                        last = inp->inp_socket;
                    239:                        /*
1.13      mycroft   240:                         * Don't look for additional matches if this one does
                    241:                         * not have either the SO_REUSEPORT or SO_REUSEADDR
                    242:                         * socket options set.  This heuristic avoids searching
                    243:                         * through all pcbs in the common case of a non-shared
                    244:                         * port.  It * assumes that an application will never
                    245:                         * clear these options after setting them.
1.4       hpeyerl   246:                         */
1.28      christos  247:                        if ((last->so_options&(SO_REUSEPORT|SO_REUSEADDR)) == 0)
1.4       hpeyerl   248:                                break;
                    249:                }
1.6       mycroft   250:
1.4       hpeyerl   251:                if (last == NULL) {
                    252:                        /*
                    253:                         * No matching pcb found; discard datagram.
                    254:                         * (No need to send an ICMP Port Unreachable
                    255:                         * for a broadcast or multicast datgram.)
                    256:                         */
1.13      mycroft   257:                        udpstat.udps_noportbcast++;
1.4       hpeyerl   258:                        goto bad;
                    259:                }
1.34      mycroft   260:                if (sbappendaddr(&last->so_rcv, sintosa(&udpsrc), m,
1.17      mycroft   261:                    (struct mbuf *)0) == 0) {
1.13      mycroft   262:                        udpstat.udps_fullsock++;
1.4       hpeyerl   263:                        goto bad;
1.13      mycroft   264:                }
1.4       hpeyerl   265:                sorwakeup(last);
                    266:                return;
                    267:        }
1.1       cgd       268:        /*
                    269:         * Locate pcb for datagram.
                    270:         */
1.35      mycroft   271:        inp = in_pcblookup_connect(&udbtable, ip->ip_src, uh->uh_sport,
1.26      mycroft   272:            ip->ip_dst, uh->uh_dport);
                    273:        if (inp == 0) {
                    274:                ++udpstat.udps_pcbhashmiss;
1.35      mycroft   275:                inp = in_pcblookup_bind(&udbtable, ip->ip_dst, uh->uh_dport);
1.18      mycroft   276:                if (inp == 0) {
                    277:                        udpstat.udps_noport++;
                    278:                        if (m->m_flags & (M_BCAST | M_MCAST)) {
                    279:                                udpstat.udps_noportbcast++;
                    280:                                goto bad;
                    281:                        }
                    282:                        *ip = save_ip;
                    283:                        ip->ip_len += iphlen;
1.37    ! ws        284: #if NKGDB > 0
        !           285:                        if (checkkgdb(&ip->ip_src,
        !           286:                                      uh->uh_sport,
        !           287:                                      uh->uh_dport,
        !           288:                                      m,
        !           289:                                      iphlen + sizeof(struct udphdr),
        !           290:                                      len - sizeof(struct udphdr)))
        !           291:                        /* It was a debugger connect packet, just drop it now */
        !           292:                                goto bad;
        !           293: #endif
1.18      mycroft   294:                        icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0);
                    295:                        return;
1.13      mycroft   296:                }
1.1       cgd       297:        }
                    298:
                    299:        /*
                    300:         * Construct sockaddr format source address.
                    301:         * Stuff source address and datagram in user buffer.
                    302:         */
1.34      mycroft   303:        udpsrc.sin_family = AF_INET;
                    304:        udpsrc.sin_len = sizeof(struct sockaddr_in);
1.36      mycroft   305:        udpsrc.sin_addr = ip->ip_src;
1.34      mycroft   306:        udpsrc.sin_port = uh->uh_sport;
1.36      mycroft   307:        bzero((caddr_t)udpsrc.sin_zero, sizeof(udpsrc.sin_zero));
1.34      mycroft   308:
1.1       cgd       309:        if (inp->inp_flags & INP_CONTROLOPTS) {
                    310:                struct mbuf **mp = &opts;
                    311:
                    312:                if (inp->inp_flags & INP_RECVDSTADDR) {
                    313:                        *mp = udp_saveopt((caddr_t) &ip->ip_dst,
                    314:                            sizeof(struct in_addr), IP_RECVDSTADDR);
                    315:                        if (*mp)
                    316:                                mp = &(*mp)->m_next;
                    317:                }
                    318: #ifdef notyet
                    319:                /* options were tossed above */
                    320:                if (inp->inp_flags & INP_RECVOPTS) {
                    321:                        *mp = udp_saveopt((caddr_t) opts_deleted_above,
                    322:                            sizeof(struct in_addr), IP_RECVOPTS);
                    323:                        if (*mp)
                    324:                                mp = &(*mp)->m_next;
                    325:                }
                    326:                /* ip_srcroute doesn't do what we want here, need to fix */
                    327:                if (inp->inp_flags & INP_RECVRETOPTS) {
                    328:                        *mp = udp_saveopt((caddr_t) ip_srcroute(),
                    329:                            sizeof(struct in_addr), IP_RECVRETOPTS);
                    330:                        if (*mp)
                    331:                                mp = &(*mp)->m_next;
                    332:                }
                    333: #endif
                    334:        }
                    335:        iphlen += sizeof(struct udphdr);
                    336:        m->m_len -= iphlen;
                    337:        m->m_pkthdr.len -= iphlen;
                    338:        m->m_data += iphlen;
1.34      mycroft   339:        if (sbappendaddr(&inp->inp_socket->so_rcv, sintosa(&udpsrc), m,
1.17      mycroft   340:            opts) == 0) {
1.1       cgd       341:                udpstat.udps_fullsock++;
                    342:                goto bad;
                    343:        }
                    344:        sorwakeup(inp->inp_socket);
                    345:        return;
                    346: bad:
                    347:        m_freem(m);
                    348:        if (opts)
                    349:                m_freem(opts);
                    350: }
                    351:
                    352: /*
                    353:  * Create a "control" mbuf containing the specified data
                    354:  * with the specified type for presentation with a datagram.
                    355:  */
1.13      mycroft   356: struct mbuf *
1.1       cgd       357: udp_saveopt(p, size, type)
                    358:        caddr_t p;
                    359:        register int size;
                    360:        int type;
                    361: {
                    362:        register struct cmsghdr *cp;
                    363:        struct mbuf *m;
                    364:
                    365:        if ((m = m_get(M_DONTWAIT, MT_CONTROL)) == NULL)
                    366:                return ((struct mbuf *) NULL);
                    367:        cp = (struct cmsghdr *) mtod(m, struct cmsghdr *);
1.13      mycroft   368:        bcopy(p, CMSG_DATA(cp), size);
1.1       cgd       369:        size += sizeof(*cp);
                    370:        m->m_len = size;
                    371:        cp->cmsg_len = size;
                    372:        cp->cmsg_level = IPPROTO_IP;
                    373:        cp->cmsg_type = type;
                    374:        return (m);
                    375: }
                    376:
                    377: /*
                    378:  * Notify a udp user of an asynchronous error;
                    379:  * just wake up so that he can collect error status.
                    380:  */
1.7       mycroft   381: static void
1.1       cgd       382: udp_notify(inp, errno)
                    383:        register struct inpcb *inp;
1.7       mycroft   384:        int errno;
1.1       cgd       385: {
1.34      mycroft   386:
1.1       cgd       387:        inp->inp_socket->so_error = errno;
                    388:        sorwakeup(inp->inp_socket);
                    389:        sowwakeup(inp->inp_socket);
                    390: }
                    391:
1.27      christos  392: void *
                    393: udp_ctlinput(cmd, sa, v)
1.1       cgd       394:        int cmd;
                    395:        struct sockaddr *sa;
1.27      christos  396:        void *v;
1.1       cgd       397: {
1.27      christos  398:        register struct ip *ip = v;
1.1       cgd       399:        register struct udphdr *uh;
1.21      mycroft   400:        extern int inetctlerrmap[];
1.18      mycroft   401:        void (*notify) __P((struct inpcb *, int)) = udp_notify;
1.21      mycroft   402:        int errno;
1.1       cgd       403:
1.20      mycroft   404:        if ((unsigned)cmd >= PRC_NCMDS)
1.27      christos  405:                return NULL;
1.20      mycroft   406:        errno = inetctlerrmap[cmd];
1.18      mycroft   407:        if (PRC_IS_REDIRECT(cmd))
1.19      mycroft   408:                notify = in_rtchange, ip = 0;
1.18      mycroft   409:        else if (cmd == PRC_HOSTDEAD)
1.19      mycroft   410:                ip = 0;
1.23      cgd       411:        else if (errno == 0)
1.27      christos  412:                return NULL;
1.19      mycroft   413:        if (ip) {
1.1       cgd       414:                uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2));
1.34      mycroft   415:                in_pcbnotify(&udbtable, satosin(sa)->sin_addr, uh->uh_dport,
                    416:                    ip->ip_src, uh->uh_sport, errno, notify);
1.19      mycroft   417:        } else
1.34      mycroft   418:                in_pcbnotifyall(&udbtable, satosin(sa)->sin_addr, errno,
                    419:                    notify);
1.27      christos  420:        return NULL;
1.1       cgd       421: }
                    422:
1.7       mycroft   423: int
1.27      christos  424: #if __STDC__
                    425: udp_output(struct mbuf *m, ...)
                    426: #else
                    427: udp_output(m, va_alist)
                    428:        struct mbuf *m;
                    429:        va_dcl
                    430: #endif
                    431: {
1.1       cgd       432:        register struct inpcb *inp;
                    433:        register struct udpiphdr *ui;
                    434:        register int len = m->m_pkthdr.len;
1.31      mycroft   435:        int error = 0;
1.27      christos  436:        va_list ap;
                    437:
                    438:        va_start(ap, m);
                    439:        inp = va_arg(ap, struct inpcb *);
                    440:        va_end(ap);
1.1       cgd       441:
                    442:        /*
                    443:         * Calculate data length and get a mbuf
                    444:         * for UDP and IP headers.
                    445:         */
1.13      mycroft   446:        M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT);
                    447:        if (m == 0) {
                    448:                error = ENOBUFS;
                    449:                goto release;
                    450:        }
1.1       cgd       451:
                    452:        /*
                    453:         * Fill in mbuf with extended UDP header
                    454:         * and addresses and length put into network format.
                    455:         */
                    456:        ui = mtod(m, struct udpiphdr *);
1.25      cgd       457:        bzero(ui->ui_x1, sizeof ui->ui_x1);
1.1       cgd       458:        ui->ui_pr = IPPROTO_UDP;
1.15      cgd       459:        ui->ui_len = htons((u_int16_t)len + sizeof (struct udphdr));
1.1       cgd       460:        ui->ui_src = inp->inp_laddr;
                    461:        ui->ui_dst = inp->inp_faddr;
                    462:        ui->ui_sport = inp->inp_lport;
                    463:        ui->ui_dport = inp->inp_fport;
                    464:        ui->ui_ulen = ui->ui_len;
                    465:
                    466:        /*
                    467:         * Stuff checksum and output datagram.
                    468:         */
                    469:        ui->ui_sum = 0;
                    470:        if (udpcksum) {
                    471:            if ((ui->ui_sum = in_cksum(m, sizeof (struct udpiphdr) + len)) == 0)
                    472:                ui->ui_sum = 0xffff;
                    473:        }
                    474:        ((struct ip *)ui)->ip_len = sizeof (struct udpiphdr) + len;
                    475:        ((struct ip *)ui)->ip_ttl = inp->inp_ip.ip_ttl; /* XXX */
                    476:        ((struct ip *)ui)->ip_tos = inp->inp_ip.ip_tos; /* XXX */
                    477:        udpstat.udps_opackets++;
1.31      mycroft   478:        return (ip_output(m, inp->inp_options, &inp->inp_route,
1.12      mycroft   479:            inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST),
1.31      mycroft   480:            inp->inp_moptions));
1.1       cgd       481:
                    482: release:
                    483:        m_freem(m);
                    484:        return (error);
                    485: }
                    486:
                    487: u_long udp_sendspace = 9216;           /* really max datagram size */
                    488: u_long udp_recvspace = 40 * (1024 + sizeof(struct sockaddr_in));
                    489:                                        /* 40 1K datagrams */
                    490:
                    491: /*ARGSUSED*/
1.7       mycroft   492: int
1.31      mycroft   493: udp_usrreq(so, req, m, nam, control, p)
1.1       cgd       494:        struct socket *so;
                    495:        int req;
1.31      mycroft   496:        struct mbuf *m, *nam, *control;
1.30      mycroft   497:        struct proc *p;
1.1       cgd       498: {
1.31      mycroft   499:        register struct inpcb *inp;
1.1       cgd       500:        int s;
1.31      mycroft   501:        register int error = 0;
1.1       cgd       502:
                    503:        if (req == PRU_CONTROL)
1.31      mycroft   504:                return (in_control(so, (long)m, (caddr_t)nam,
1.30      mycroft   505:                    (struct ifnet *)control, p));
1.31      mycroft   506:
                    507:        s = splsoftnet();
                    508:        inp = sotoinpcb(so);
1.32      mycroft   509: #ifdef DIAGNOSTIC
                    510:        if (req != PRU_SEND && req != PRU_SENDOOB && control)
                    511:                panic("udp_usrreq: unexpected control mbuf");
                    512: #endif
1.31      mycroft   513:        if (inp == 0 && req != PRU_ATTACH) {
                    514:                error = EINVAL;
                    515:                goto release;
                    516:        }
                    517:
1.1       cgd       518:        /*
                    519:         * Note: need to block udp_input while changing
                    520:         * the udp pcb queue and/or pcb addresses.
                    521:         */
                    522:        switch (req) {
                    523:
                    524:        case PRU_ATTACH:
1.31      mycroft   525:                if (inp != 0) {
                    526:                        error = EISCONN;
1.1       cgd       527:                        break;
                    528:                }
1.31      mycroft   529:                if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
                    530:                        error = soreserve(so, udp_sendspace, udp_recvspace);
                    531:                        if (error)
                    532:                                break;
                    533:                }
1.18      mycroft   534:                error = in_pcballoc(so, &udbtable);
1.1       cgd       535:                if (error)
                    536:                        break;
1.31      mycroft   537:                inp = sotoinpcb(so);
                    538:                inp->inp_ip.ip_ttl = ip_defttl;
1.1       cgd       539:                break;
                    540:
                    541:        case PRU_DETACH:
1.31      mycroft   542:                in_pcbdetach(inp);
1.1       cgd       543:                break;
                    544:
                    545:        case PRU_BIND:
1.31      mycroft   546:                error = in_pcbbind(inp, nam, p);
1.1       cgd       547:                break;
                    548:
                    549:        case PRU_LISTEN:
                    550:                error = EOPNOTSUPP;
                    551:                break;
                    552:
                    553:        case PRU_CONNECT:
1.31      mycroft   554:                error = in_pcbconnect(inp, nam);
                    555:                if (error)
1.1       cgd       556:                        break;
1.31      mycroft   557:                soisconnected(so);
1.1       cgd       558:                break;
                    559:
                    560:        case PRU_CONNECT2:
                    561:                error = EOPNOTSUPP;
                    562:                break;
                    563:
                    564:        case PRU_DISCONNECT:
1.31      mycroft   565:                /*soisdisconnected(so);*/
                    566:                so->so_state &= ~SS_ISCONNECTED;        /* XXX */
1.1       cgd       567:                in_pcbdisconnect(inp);
1.34      mycroft   568:                inp->inp_laddr = zeroin_addr;           /* XXX */
1.35      mycroft   569:                in_pcbstate(inp, INP_BOUND);            /* XXX */
1.1       cgd       570:                break;
                    571:
                    572:        case PRU_SHUTDOWN:
                    573:                socantsendmore(so);
                    574:                break;
                    575:
1.31      mycroft   576:        case PRU_RCVD:
                    577:                error = EOPNOTSUPP;
1.1       cgd       578:                break;
                    579:
1.31      mycroft   580:        case PRU_SEND:
1.32      mycroft   581:                if (control && control->m_len) {
                    582:                        m_freem(control);
                    583:                        m_freem(m);
                    584:                        error = EINVAL;
                    585:                        break;
                    586:                }
1.31      mycroft   587:        {
1.35      mycroft   588:                struct in_addr laddr;                   /* XXX */
1.1       cgd       589:
1.31      mycroft   590:                if (nam) {
1.35      mycroft   591:                        laddr = inp->inp_laddr;         /* XXX */
1.31      mycroft   592:                        if ((so->so_state & SS_ISCONNECTED) != 0) {
                    593:                                error = EISCONN;
1.32      mycroft   594:                                goto die;
1.31      mycroft   595:                        }
                    596:                        error = in_pcbconnect(inp, nam);
1.32      mycroft   597:                        if (error) {
                    598:                        die:
                    599:                                m_freem(m);
1.31      mycroft   600:                                break;
1.32      mycroft   601:                        }
1.31      mycroft   602:                } else {
                    603:                        if ((so->so_state & SS_ISCONNECTED) == 0) {
                    604:                                error = ENOTCONN;
1.32      mycroft   605:                                goto die;
1.31      mycroft   606:                        }
                    607:                }
1.33      mycroft   608:                error = udp_output(m, inp);
1.31      mycroft   609:                if (nam) {
                    610:                        in_pcbdisconnect(inp);
1.35      mycroft   611:                        inp->inp_laddr = laddr;         /* XXX */
                    612:                        in_pcbstate(inp, INP_BOUND);    /* XXX */
1.31      mycroft   613:                }
                    614:        }
1.1       cgd       615:                break;
                    616:
                    617:        case PRU_SENSE:
                    618:                /*
                    619:                 * stat: don't bother with a blocksize.
                    620:                 */
1.31      mycroft   621:                splx(s);
1.1       cgd       622:                return (0);
                    623:
1.31      mycroft   624:        case PRU_RCVOOB:
                    625:                error =  EOPNOTSUPP;
                    626:                break;
                    627:
1.1       cgd       628:        case PRU_SENDOOB:
1.32      mycroft   629:                m_freem(control);
1.31      mycroft   630:                m_freem(m);
1.1       cgd       631:                error =  EOPNOTSUPP;
                    632:                break;
                    633:
1.31      mycroft   634:        case PRU_SOCKADDR:
                    635:                in_setsockaddr(inp, nam);
                    636:                break;
                    637:
                    638:        case PRU_PEERADDR:
                    639:                in_setpeeraddr(inp, nam);
                    640:                break;
1.1       cgd       641:
                    642:        default:
                    643:                panic("udp_usrreq");
                    644:        }
                    645:
                    646: release:
1.31      mycroft   647:        splx(s);
1.1       cgd       648:        return (error);
1.13      mycroft   649: }
                    650:
                    651: /*
                    652:  * Sysctl for udp variables.
                    653:  */
1.27      christos  654: int
1.13      mycroft   655: udp_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
                    656:        int *name;
                    657:        u_int namelen;
                    658:        void *oldp;
                    659:        size_t *oldlenp;
                    660:        void *newp;
                    661:        size_t newlen;
                    662: {
                    663:        /* All sysctl names at this level are terminal. */
                    664:        if (namelen != 1)
                    665:                return (ENOTDIR);
                    666:
                    667:        switch (name[0]) {
                    668:        case UDPCTL_CHECKSUM:
                    669:                return (sysctl_int(oldp, oldlenp, newp, newlen, &udpcksum));
                    670:        default:
                    671:                return (ENOPROTOOPT);
                    672:        }
                    673:        /* NOTREACHED */
1.1       cgd       674: }

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