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Annotation of src/sys/netinet/udp_usrreq.c, Revision 1.1.1.1

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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