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Annotation of src/sys/netinet/udp_usrreq.c, Revision 1.1

1.1     ! cgd         1: /*
        !             2:  * Copyright (c) 1982, 1986, 1988, 1990 Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms, with or without
        !             6:  * modification, are permitted provided that the following conditions
        !             7:  * are met:
        !             8:  * 1. Redistributions of source code must retain the above copyright
        !             9:  *    notice, this list of conditions and the following disclaimer.
        !            10:  * 2. Redistributions in binary form must reproduce the above copyright
        !            11:  *    notice, this list of conditions and the following disclaimer in the
        !            12:  *    documentation and/or other materials provided with the distribution.
        !            13:  * 3. All advertising materials mentioning features or use of this software
        !            14:  *    must display the following acknowledgement:
        !            15:  *     This product includes software developed by the University of
        !            16:  *     California, Berkeley and its contributors.
        !            17:  * 4. Neither the name of the University nor the names of its contributors
        !            18:  *    may be used to endorse or promote products derived from this software
        !            19:  *    without specific prior written permission.
        !            20:  *
        !            21:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            22:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            23:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            24:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            25:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            26:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            27:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            28:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            29:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            30:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            31:  * SUCH DAMAGE.
        !            32:  *
        !            33:  *     @(#)udp_usrreq.c        7.20 (Berkeley) 4/20/91
        !            34:  */
        !            35:
        !            36: #include "param.h"
        !            37: #include "malloc.h"
        !            38: #include "mbuf.h"
        !            39: #include "protosw.h"
        !            40: #include "socket.h"
        !            41: #include "socketvar.h"
        !            42: #include "stat.h"
        !            43:
        !            44: #include "../net/if.h"
        !            45: #include "../net/route.h"
        !            46:
        !            47: #include "in.h"
        !            48: #include "in_systm.h"
        !            49: #include "ip.h"
        !            50: #include "in_pcb.h"
        !            51: #include "ip_var.h"
        !            52: #include "ip_icmp.h"
        !            53: #include "udp.h"
        !            54: #include "udp_var.h"
        !            55:
        !            56: struct inpcb *udp_last_inpcb = &udb;
        !            57:
        !            58: /*
        !            59:  * UDP protocol implementation.
        !            60:  * Per RFC 768, August, 1980.
        !            61:  */
        !            62: udp_init()
        !            63: {
        !            64:
        !            65:        udb.inp_next = udb.inp_prev = &udb;
        !            66: }
        !            67:
        !            68: #ifndef        COMPAT_42
        !            69: int    udpcksum = 1;
        !            70: #else
        !            71: int    udpcksum = 0;           /* XXX */
        !            72: #endif
        !            73: int    udp_ttl = UDP_TTL;
        !            74:
        !            75: struct sockaddr_in udp_in = { sizeof(udp_in), AF_INET };
        !            76:
        !            77: udp_input(m, iphlen)
        !            78:        register struct mbuf *m;
        !            79:        int iphlen;
        !            80: {
        !            81:        register struct ip *ip;
        !            82:        register struct udphdr *uh;
        !            83:        register struct inpcb *inp;
        !            84:        struct mbuf *opts = 0;
        !            85:        int len;
        !            86:        struct ip save_ip;
        !            87:
        !            88:        udpstat.udps_ipackets++;
        !            89:
        !            90:        /*
        !            91:         * Strip IP options, if any; should skip this,
        !            92:         * make available to user, and use on returned packets,
        !            93:         * but we don't yet have a way to check the checksum
        !            94:         * with options still present.
        !            95:         */
        !            96:        if (iphlen > sizeof (struct ip)) {
        !            97:                ip_stripoptions(m, (struct mbuf *)0);
        !            98:                iphlen = sizeof(struct ip);
        !            99:        }
        !           100:
        !           101:        /*
        !           102:         * Get IP and UDP header together in first mbuf.
        !           103:         */
        !           104:        ip = mtod(m, struct ip *);
        !           105:        if (m->m_len < iphlen + sizeof(struct udphdr)) {
        !           106:                if ((m = m_pullup(m, iphlen + sizeof(struct udphdr))) == 0) {
        !           107:                        udpstat.udps_hdrops++;
        !           108:                        return;
        !           109:                }
        !           110:                ip = mtod(m, struct ip *);
        !           111:        }
        !           112:        uh = (struct udphdr *)((caddr_t)ip + iphlen);
        !           113:
        !           114:        /*
        !           115:         * Make mbuf data length reflect UDP length.
        !           116:         * If not enough data to reflect UDP length, drop.
        !           117:         */
        !           118:        len = ntohs((u_short)uh->uh_ulen);
        !           119:        if (ip->ip_len != len) {
        !           120:                if (len > ip->ip_len) {
        !           121:                        udpstat.udps_badlen++;
        !           122:                        goto bad;
        !           123:                }
        !           124:                m_adj(m, len - ip->ip_len);
        !           125:                /* ip->ip_len = len; */
        !           126:        }
        !           127:        /*
        !           128:         * Save a copy of the IP header in case we want restore it
        !           129:         * for sending an ICMP error message in response.
        !           130:         */
        !           131:        save_ip = *ip;
        !           132:
        !           133:        /*
        !           134:         * Checksum extended UDP header and data.
        !           135:         */
        !           136:        if (udpcksum && uh->uh_sum) {
        !           137:                ((struct ipovly *)ip)->ih_next = 0;
        !           138:                ((struct ipovly *)ip)->ih_prev = 0;
        !           139:                ((struct ipovly *)ip)->ih_x1 = 0;
        !           140:                ((struct ipovly *)ip)->ih_len = uh->uh_ulen;
        !           141:                if (uh->uh_sum = in_cksum(m, len + sizeof (struct ip))) {
        !           142:                        udpstat.udps_badsum++;
        !           143:                        m_freem(m);
        !           144:                        return;
        !           145:                }
        !           146:        }
        !           147:
        !           148:        /*
        !           149:         * Locate pcb for datagram.
        !           150:         */
        !           151:        inp = udp_last_inpcb;
        !           152:        if (inp->inp_lport != uh->uh_dport ||
        !           153:            inp->inp_fport != uh->uh_sport ||
        !           154:            inp->inp_faddr.s_addr != ip->ip_src.s_addr ||
        !           155:            inp->inp_laddr.s_addr != ip->ip_dst.s_addr) {
        !           156:                inp = in_pcblookup(&udb, ip->ip_src, uh->uh_sport,
        !           157:                    ip->ip_dst, uh->uh_dport, INPLOOKUP_WILDCARD);
        !           158:                if (inp)
        !           159:                        udp_last_inpcb = inp;
        !           160:                udpstat.udpps_pcbcachemiss++;
        !           161:        }
        !           162:        if (inp == 0) {
        !           163:                /* don't send ICMP response for broadcast packet */
        !           164:                udpstat.udps_noport++;
        !           165:                if (m->m_flags & M_BCAST) {
        !           166:                        udpstat.udps_noportbcast++;
        !           167:                        goto bad;
        !           168:                }
        !           169:                *ip = save_ip;
        !           170:                ip->ip_len += iphlen;
        !           171:                icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT);
        !           172:                return;
        !           173:        }
        !           174:
        !           175:        /*
        !           176:         * Construct sockaddr format source address.
        !           177:         * Stuff source address and datagram in user buffer.
        !           178:         */
        !           179:        udp_in.sin_port = uh->uh_sport;
        !           180:        udp_in.sin_addr = ip->ip_src;
        !           181:        if (inp->inp_flags & INP_CONTROLOPTS) {
        !           182:                struct mbuf **mp = &opts;
        !           183:                struct mbuf *udp_saveopt();
        !           184:
        !           185:                if (inp->inp_flags & INP_RECVDSTADDR) {
        !           186:                        *mp = udp_saveopt((caddr_t) &ip->ip_dst,
        !           187:                            sizeof(struct in_addr), IP_RECVDSTADDR);
        !           188:                        if (*mp)
        !           189:                                mp = &(*mp)->m_next;
        !           190:                }
        !           191: #ifdef notyet
        !           192:                /* options were tossed above */
        !           193:                if (inp->inp_flags & INP_RECVOPTS) {
        !           194:                        *mp = udp_saveopt((caddr_t) opts_deleted_above,
        !           195:                            sizeof(struct in_addr), IP_RECVOPTS);
        !           196:                        if (*mp)
        !           197:                                mp = &(*mp)->m_next;
        !           198:                }
        !           199:                /* ip_srcroute doesn't do what we want here, need to fix */
        !           200:                if (inp->inp_flags & INP_RECVRETOPTS) {
        !           201:                        *mp = udp_saveopt((caddr_t) ip_srcroute(),
        !           202:                            sizeof(struct in_addr), IP_RECVRETOPTS);
        !           203:                        if (*mp)
        !           204:                                mp = &(*mp)->m_next;
        !           205:                }
        !           206: #endif
        !           207:        }
        !           208:        iphlen += sizeof(struct udphdr);
        !           209:        m->m_len -= iphlen;
        !           210:        m->m_pkthdr.len -= iphlen;
        !           211:        m->m_data += iphlen;
        !           212:        if (sbappendaddr(&inp->inp_socket->so_rcv, (struct sockaddr *)&udp_in,
        !           213:            m, opts) == 0) {
        !           214:                udpstat.udps_fullsock++;
        !           215:                goto bad;
        !           216:        }
        !           217:        sorwakeup(inp->inp_socket);
        !           218:        return;
        !           219: bad:
        !           220:        m_freem(m);
        !           221:        if (opts)
        !           222:                m_freem(opts);
        !           223: }
        !           224:
        !           225: /*
        !           226:  * Create a "control" mbuf containing the specified data
        !           227:  * with the specified type for presentation with a datagram.
        !           228:  */
        !           229: struct mbuf *
        !           230: udp_saveopt(p, size, type)
        !           231:        caddr_t p;
        !           232:        register int size;
        !           233:        int type;
        !           234: {
        !           235:        register struct cmsghdr *cp;
        !           236:        struct mbuf *m;
        !           237:
        !           238:        if ((m = m_get(M_DONTWAIT, MT_CONTROL)) == NULL)
        !           239:                return ((struct mbuf *) NULL);
        !           240:        cp = (struct cmsghdr *) mtod(m, struct cmsghdr *);
        !           241:        bcopy(p, (caddr_t)(cp + 1), size);
        !           242:        size += sizeof(*cp);
        !           243:        m->m_len = size;
        !           244:        cp->cmsg_len = size;
        !           245:        cp->cmsg_level = IPPROTO_IP;
        !           246:        cp->cmsg_type = type;
        !           247:        return (m);
        !           248: }
        !           249:
        !           250: /*
        !           251:  * Notify a udp user of an asynchronous error;
        !           252:  * just wake up so that he can collect error status.
        !           253:  */
        !           254: udp_notify(inp, errno)
        !           255:        register struct inpcb *inp;
        !           256: {
        !           257:
        !           258:        inp->inp_socket->so_error = errno;
        !           259:        sorwakeup(inp->inp_socket);
        !           260:        sowwakeup(inp->inp_socket);
        !           261: }
        !           262:
        !           263: udp_ctlinput(cmd, sa, ip)
        !           264:        int cmd;
        !           265:        struct sockaddr *sa;
        !           266:        register struct ip *ip;
        !           267: {
        !           268:        register struct udphdr *uh;
        !           269:        extern struct in_addr zeroin_addr;
        !           270:        extern u_char inetctlerrmap[];
        !           271:
        !           272:        if ((unsigned)cmd > PRC_NCMDS || inetctlerrmap[cmd] == 0)
        !           273:                return;
        !           274:        if (ip) {
        !           275:                uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2));
        !           276:                in_pcbnotify(&udb, sa, uh->uh_dport, ip->ip_src, uh->uh_sport,
        !           277:                        cmd, udp_notify);
        !           278:        } else
        !           279:                in_pcbnotify(&udb, sa, 0, zeroin_addr, 0, cmd, udp_notify);
        !           280: }
        !           281:
        !           282: udp_output(inp, m, addr, control)
        !           283:        register struct inpcb *inp;
        !           284:        register struct mbuf *m;
        !           285:        struct mbuf *addr, *control;
        !           286: {
        !           287:        register struct udpiphdr *ui;
        !           288:        register int len = m->m_pkthdr.len;
        !           289:        struct in_addr laddr;
        !           290:        int s, error = 0;
        !           291:
        !           292:        if (control)
        !           293:                m_freem(control);               /* XXX */
        !           294:
        !           295:        if (addr) {
        !           296:                laddr = inp->inp_laddr;
        !           297:                if (inp->inp_faddr.s_addr != INADDR_ANY) {
        !           298:                        error = EISCONN;
        !           299:                        goto release;
        !           300:                }
        !           301:                /*
        !           302:                 * Must block input while temporarily connected.
        !           303:                 */
        !           304:                s = splnet();
        !           305:                error = in_pcbconnect(inp, addr);
        !           306:                if (error) {
        !           307:                        splx(s);
        !           308:                        goto release;
        !           309:                }
        !           310:        } else {
        !           311:                if (inp->inp_faddr.s_addr == INADDR_ANY) {
        !           312:                        error = ENOTCONN;
        !           313:                        goto release;
        !           314:                }
        !           315:        }
        !           316:        /*
        !           317:         * Calculate data length and get a mbuf
        !           318:         * for UDP and IP headers.
        !           319:         */
        !           320:        M_PREPEND(m, sizeof(struct udpiphdr), M_WAIT);
        !           321:
        !           322:        /*
        !           323:         * Fill in mbuf with extended UDP header
        !           324:         * and addresses and length put into network format.
        !           325:         */
        !           326:        ui = mtod(m, struct udpiphdr *);
        !           327:        ui->ui_next = ui->ui_prev = 0;
        !           328:        ui->ui_x1 = 0;
        !           329:        ui->ui_pr = IPPROTO_UDP;
        !           330:        ui->ui_len = htons((u_short)len + sizeof (struct udphdr));
        !           331:        ui->ui_src = inp->inp_laddr;
        !           332:        ui->ui_dst = inp->inp_faddr;
        !           333:        ui->ui_sport = inp->inp_lport;
        !           334:        ui->ui_dport = inp->inp_fport;
        !           335:        ui->ui_ulen = ui->ui_len;
        !           336:
        !           337:        /*
        !           338:         * Stuff checksum and output datagram.
        !           339:         */
        !           340:        ui->ui_sum = 0;
        !           341:        if (udpcksum) {
        !           342:            if ((ui->ui_sum = in_cksum(m, sizeof (struct udpiphdr) + len)) == 0)
        !           343:                ui->ui_sum = 0xffff;
        !           344:        }
        !           345:        ((struct ip *)ui)->ip_len = sizeof (struct udpiphdr) + len;
        !           346:        ((struct ip *)ui)->ip_ttl = inp->inp_ip.ip_ttl; /* XXX */
        !           347:        ((struct ip *)ui)->ip_tos = inp->inp_ip.ip_tos; /* XXX */
        !           348:        udpstat.udps_opackets++;
        !           349:        error = ip_output(m, inp->inp_options, &inp->inp_route,
        !           350:            inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST));
        !           351:
        !           352:        if (addr) {
        !           353:                in_pcbdisconnect(inp);
        !           354:                inp->inp_laddr = laddr;
        !           355:                splx(s);
        !           356:        }
        !           357:        return (error);
        !           358:
        !           359: release:
        !           360:        m_freem(m);
        !           361:        return (error);
        !           362: }
        !           363:
        !           364: u_long udp_sendspace = 9216;           /* really max datagram size */
        !           365: u_long udp_recvspace = 40 * (1024 + sizeof(struct sockaddr_in));
        !           366:                                        /* 40 1K datagrams */
        !           367:
        !           368: /*ARGSUSED*/
        !           369: udp_usrreq(so, req, m, addr, control)
        !           370:        struct socket *so;
        !           371:        int req;
        !           372:        struct mbuf *m, *addr, *control;
        !           373: {
        !           374:        struct inpcb *inp = sotoinpcb(so);
        !           375:        int error = 0;
        !           376:        int s;
        !           377:
        !           378:        if (req == PRU_CONTROL)
        !           379:                return (in_control(so, (int)m, (caddr_t)addr,
        !           380:                        (struct ifnet *)control));
        !           381:        if (inp == NULL && req != PRU_ATTACH) {
        !           382:                error = EINVAL;
        !           383:                goto release;
        !           384:        }
        !           385:        /*
        !           386:         * Note: need to block udp_input while changing
        !           387:         * the udp pcb queue and/or pcb addresses.
        !           388:         */
        !           389:        switch (req) {
        !           390:
        !           391:        case PRU_ATTACH:
        !           392:                if (inp != NULL) {
        !           393:                        error = EINVAL;
        !           394:                        break;
        !           395:                }
        !           396:                s = splnet();
        !           397:                error = in_pcballoc(so, &udb);
        !           398:                splx(s);
        !           399:                if (error)
        !           400:                        break;
        !           401:                error = soreserve(so, udp_sendspace, udp_recvspace);
        !           402:                if (error)
        !           403:                        break;
        !           404:                ((struct inpcb *) so->so_pcb)->inp_ip.ip_ttl = udp_ttl;
        !           405:                break;
        !           406:
        !           407:        case PRU_DETACH:
        !           408:                udp_detach(inp);
        !           409:                break;
        !           410:
        !           411:        case PRU_BIND:
        !           412:                s = splnet();
        !           413:                error = in_pcbbind(inp, addr);
        !           414:                splx(s);
        !           415:                break;
        !           416:
        !           417:        case PRU_LISTEN:
        !           418:                error = EOPNOTSUPP;
        !           419:                break;
        !           420:
        !           421:        case PRU_CONNECT:
        !           422:                if (inp->inp_faddr.s_addr != INADDR_ANY) {
        !           423:                        error = EISCONN;
        !           424:                        break;
        !           425:                }
        !           426:                s = splnet();
        !           427:                error = in_pcbconnect(inp, addr);
        !           428:                splx(s);
        !           429:                if (error == 0)
        !           430:                        soisconnected(so);
        !           431:                break;
        !           432:
        !           433:        case PRU_CONNECT2:
        !           434:                error = EOPNOTSUPP;
        !           435:                break;
        !           436:
        !           437:        case PRU_ACCEPT:
        !           438:                error = EOPNOTSUPP;
        !           439:                break;
        !           440:
        !           441:        case PRU_DISCONNECT:
        !           442:                if (inp->inp_faddr.s_addr == INADDR_ANY) {
        !           443:                        error = ENOTCONN;
        !           444:                        break;
        !           445:                }
        !           446:                s = splnet();
        !           447:                in_pcbdisconnect(inp);
        !           448:                inp->inp_laddr.s_addr = INADDR_ANY;
        !           449:                splx(s);
        !           450:                so->so_state &= ~SS_ISCONNECTED;                /* XXX */
        !           451:                break;
        !           452:
        !           453:        case PRU_SHUTDOWN:
        !           454:                socantsendmore(so);
        !           455:                break;
        !           456:
        !           457:        case PRU_SEND:
        !           458:                return (udp_output(inp, m, addr, control));
        !           459:
        !           460:        case PRU_ABORT:
        !           461:                soisdisconnected(so);
        !           462:                udp_detach(inp);
        !           463:                break;
        !           464:
        !           465:        case PRU_SOCKADDR:
        !           466:                in_setsockaddr(inp, addr);
        !           467:                break;
        !           468:
        !           469:        case PRU_PEERADDR:
        !           470:                in_setpeeraddr(inp, addr);
        !           471:                break;
        !           472:
        !           473:        case PRU_SENSE:
        !           474:                /*
        !           475:                 * stat: don't bother with a blocksize.
        !           476:                 */
        !           477:                return (0);
        !           478:
        !           479:        case PRU_SENDOOB:
        !           480:        case PRU_FASTTIMO:
        !           481:        case PRU_SLOWTIMO:
        !           482:        case PRU_PROTORCV:
        !           483:        case PRU_PROTOSEND:
        !           484:                error =  EOPNOTSUPP;
        !           485:                break;
        !           486:
        !           487:        case PRU_RCVD:
        !           488:        case PRU_RCVOOB:
        !           489:                return (EOPNOTSUPP);    /* do not free mbuf's */
        !           490:
        !           491:        default:
        !           492:                panic("udp_usrreq");
        !           493:        }
        !           494:
        !           495: release:
        !           496:        if (control) {
        !           497:                printf("udp control data unexpectedly retained\n");
        !           498:                m_freem(control);
        !           499:        }
        !           500:        if (m)
        !           501:                m_freem(m);
        !           502:        return (error);
        !           503: }
        !           504:
        !           505: udp_detach(inp)
        !           506:        struct inpcb *inp;
        !           507: {
        !           508:        int s = splnet();
        !           509:
        !           510:        if (inp == udp_last_inpcb)
        !           511:                udp_last_inpcb = &udb;
        !           512:        in_pcbdetach(inp);
        !           513:        splx(s);
        !           514: }

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