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Annotation of src/sys/netinet/udp_usrreq.c, Revision 1.2

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:  *
1.2     ! cgd        33:  *     from: @(#)udp_usrreq.c  7.20 (Berkeley) 4/20/91
        !            34:  *     $Id$
1.1       cgd        35:  */
                     36:
                     37: #include "param.h"
                     38: #include "malloc.h"
1.2     ! cgd        39: #include "select.h"
1.1       cgd        40: #include "mbuf.h"
                     41: #include "protosw.h"
                     42: #include "socket.h"
                     43: #include "socketvar.h"
                     44: #include "stat.h"
                     45:
                     46: #include "../net/if.h"
                     47: #include "../net/route.h"
                     48:
                     49: #include "in.h"
                     50: #include "in_systm.h"
                     51: #include "ip.h"
                     52: #include "in_pcb.h"
                     53: #include "ip_var.h"
                     54: #include "ip_icmp.h"
                     55: #include "udp.h"
                     56: #include "udp_var.h"
                     57:
                     58: struct inpcb *udp_last_inpcb = &udb;
                     59:
                     60: /*
                     61:  * UDP protocol implementation.
                     62:  * Per RFC 768, August, 1980.
                     63:  */
                     64: udp_init()
                     65: {
                     66:
                     67:        udb.inp_next = udb.inp_prev = &udb;
                     68: }
                     69:
                     70: #ifndef        COMPAT_42
                     71: int    udpcksum = 1;
                     72: #else
                     73: int    udpcksum = 0;           /* XXX */
                     74: #endif
                     75: int    udp_ttl = UDP_TTL;
                     76:
                     77: struct sockaddr_in udp_in = { sizeof(udp_in), AF_INET };
                     78:
                     79: udp_input(m, iphlen)
                     80:        register struct mbuf *m;
                     81:        int iphlen;
                     82: {
                     83:        register struct ip *ip;
                     84:        register struct udphdr *uh;
                     85:        register struct inpcb *inp;
                     86:        struct mbuf *opts = 0;
                     87:        int len;
                     88:        struct ip save_ip;
                     89:
                     90:        udpstat.udps_ipackets++;
                     91:
                     92:        /*
                     93:         * Strip IP options, if any; should skip this,
                     94:         * make available to user, and use on returned packets,
                     95:         * but we don't yet have a way to check the checksum
                     96:         * with options still present.
                     97:         */
                     98:        if (iphlen > sizeof (struct ip)) {
                     99:                ip_stripoptions(m, (struct mbuf *)0);
                    100:                iphlen = sizeof(struct ip);
                    101:        }
                    102:
                    103:        /*
                    104:         * Get IP and UDP header together in first mbuf.
                    105:         */
                    106:        ip = mtod(m, struct ip *);
                    107:        if (m->m_len < iphlen + sizeof(struct udphdr)) {
                    108:                if ((m = m_pullup(m, iphlen + sizeof(struct udphdr))) == 0) {
                    109:                        udpstat.udps_hdrops++;
                    110:                        return;
                    111:                }
                    112:                ip = mtod(m, struct ip *);
                    113:        }
                    114:        uh = (struct udphdr *)((caddr_t)ip + iphlen);
                    115:
                    116:        /*
                    117:         * Make mbuf data length reflect UDP length.
                    118:         * If not enough data to reflect UDP length, drop.
                    119:         */
                    120:        len = ntohs((u_short)uh->uh_ulen);
                    121:        if (ip->ip_len != len) {
                    122:                if (len > ip->ip_len) {
                    123:                        udpstat.udps_badlen++;
                    124:                        goto bad;
                    125:                }
                    126:                m_adj(m, len - ip->ip_len);
                    127:                /* ip->ip_len = len; */
                    128:        }
                    129:        /*
                    130:         * Save a copy of the IP header in case we want restore it
                    131:         * for sending an ICMP error message in response.
                    132:         */
                    133:        save_ip = *ip;
                    134:
                    135:        /*
                    136:         * Checksum extended UDP header and data.
                    137:         */
                    138:        if (udpcksum && uh->uh_sum) {
                    139:                ((struct ipovly *)ip)->ih_next = 0;
                    140:                ((struct ipovly *)ip)->ih_prev = 0;
                    141:                ((struct ipovly *)ip)->ih_x1 = 0;
                    142:                ((struct ipovly *)ip)->ih_len = uh->uh_ulen;
                    143:                if (uh->uh_sum = in_cksum(m, len + sizeof (struct ip))) {
                    144:                        udpstat.udps_badsum++;
                    145:                        m_freem(m);
                    146:                        return;
                    147:                }
                    148:        }
                    149:
                    150:        /*
                    151:         * Locate pcb for datagram.
                    152:         */
                    153:        inp = udp_last_inpcb;
                    154:        if (inp->inp_lport != uh->uh_dport ||
                    155:            inp->inp_fport != uh->uh_sport ||
                    156:            inp->inp_faddr.s_addr != ip->ip_src.s_addr ||
                    157:            inp->inp_laddr.s_addr != ip->ip_dst.s_addr) {
                    158:                inp = in_pcblookup(&udb, ip->ip_src, uh->uh_sport,
                    159:                    ip->ip_dst, uh->uh_dport, INPLOOKUP_WILDCARD);
                    160:                if (inp)
                    161:                        udp_last_inpcb = inp;
                    162:                udpstat.udpps_pcbcachemiss++;
                    163:        }
                    164:        if (inp == 0) {
                    165:                /* don't send ICMP response for broadcast packet */
                    166:                udpstat.udps_noport++;
                    167:                if (m->m_flags & M_BCAST) {
                    168:                        udpstat.udps_noportbcast++;
                    169:                        goto bad;
                    170:                }
                    171:                *ip = save_ip;
                    172:                ip->ip_len += iphlen;
                    173:                icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT);
                    174:                return;
                    175:        }
                    176:
                    177:        /*
                    178:         * Construct sockaddr format source address.
                    179:         * Stuff source address and datagram in user buffer.
                    180:         */
                    181:        udp_in.sin_port = uh->uh_sport;
                    182:        udp_in.sin_addr = ip->ip_src;
                    183:        if (inp->inp_flags & INP_CONTROLOPTS) {
                    184:                struct mbuf **mp = &opts;
                    185:                struct mbuf *udp_saveopt();
                    186:
                    187:                if (inp->inp_flags & INP_RECVDSTADDR) {
                    188:                        *mp = udp_saveopt((caddr_t) &ip->ip_dst,
                    189:                            sizeof(struct in_addr), IP_RECVDSTADDR);
                    190:                        if (*mp)
                    191:                                mp = &(*mp)->m_next;
                    192:                }
                    193: #ifdef notyet
                    194:                /* options were tossed above */
                    195:                if (inp->inp_flags & INP_RECVOPTS) {
                    196:                        *mp = udp_saveopt((caddr_t) opts_deleted_above,
                    197:                            sizeof(struct in_addr), IP_RECVOPTS);
                    198:                        if (*mp)
                    199:                                mp = &(*mp)->m_next;
                    200:                }
                    201:                /* ip_srcroute doesn't do what we want here, need to fix */
                    202:                if (inp->inp_flags & INP_RECVRETOPTS) {
                    203:                        *mp = udp_saveopt((caddr_t) ip_srcroute(),
                    204:                            sizeof(struct in_addr), IP_RECVRETOPTS);
                    205:                        if (*mp)
                    206:                                mp = &(*mp)->m_next;
                    207:                }
                    208: #endif
                    209:        }
                    210:        iphlen += sizeof(struct udphdr);
                    211:        m->m_len -= iphlen;
                    212:        m->m_pkthdr.len -= iphlen;
                    213:        m->m_data += iphlen;
                    214:        if (sbappendaddr(&inp->inp_socket->so_rcv, (struct sockaddr *)&udp_in,
                    215:            m, opts) == 0) {
                    216:                udpstat.udps_fullsock++;
                    217:                goto bad;
                    218:        }
                    219:        sorwakeup(inp->inp_socket);
                    220:        return;
                    221: bad:
                    222:        m_freem(m);
                    223:        if (opts)
                    224:                m_freem(opts);
                    225: }
                    226:
                    227: /*
                    228:  * Create a "control" mbuf containing the specified data
                    229:  * with the specified type for presentation with a datagram.
                    230:  */
                    231: struct mbuf *
                    232: udp_saveopt(p, size, type)
                    233:        caddr_t p;
                    234:        register int size;
                    235:        int type;
                    236: {
                    237:        register struct cmsghdr *cp;
                    238:        struct mbuf *m;
                    239:
                    240:        if ((m = m_get(M_DONTWAIT, MT_CONTROL)) == NULL)
                    241:                return ((struct mbuf *) NULL);
                    242:        cp = (struct cmsghdr *) mtod(m, struct cmsghdr *);
                    243:        bcopy(p, (caddr_t)(cp + 1), size);
                    244:        size += sizeof(*cp);
                    245:        m->m_len = size;
                    246:        cp->cmsg_len = size;
                    247:        cp->cmsg_level = IPPROTO_IP;
                    248:        cp->cmsg_type = type;
                    249:        return (m);
                    250: }
                    251:
                    252: /*
                    253:  * Notify a udp user of an asynchronous error;
                    254:  * just wake up so that he can collect error status.
                    255:  */
                    256: udp_notify(inp, errno)
                    257:        register struct inpcb *inp;
                    258: {
                    259:
                    260:        inp->inp_socket->so_error = errno;
                    261:        sorwakeup(inp->inp_socket);
                    262:        sowwakeup(inp->inp_socket);
                    263: }
                    264:
                    265: udp_ctlinput(cmd, sa, ip)
                    266:        int cmd;
                    267:        struct sockaddr *sa;
                    268:        register struct ip *ip;
                    269: {
                    270:        register struct udphdr *uh;
                    271:        extern struct in_addr zeroin_addr;
                    272:        extern u_char inetctlerrmap[];
                    273:
                    274:        if ((unsigned)cmd > PRC_NCMDS || inetctlerrmap[cmd] == 0)
                    275:                return;
                    276:        if (ip) {
                    277:                uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2));
                    278:                in_pcbnotify(&udb, sa, uh->uh_dport, ip->ip_src, uh->uh_sport,
                    279:                        cmd, udp_notify);
                    280:        } else
                    281:                in_pcbnotify(&udb, sa, 0, zeroin_addr, 0, cmd, udp_notify);
                    282: }
                    283:
                    284: udp_output(inp, m, addr, control)
                    285:        register struct inpcb *inp;
                    286:        register struct mbuf *m;
                    287:        struct mbuf *addr, *control;
                    288: {
                    289:        register struct udpiphdr *ui;
                    290:        register int len = m->m_pkthdr.len;
                    291:        struct in_addr laddr;
                    292:        int s, error = 0;
                    293:
                    294:        if (control)
                    295:                m_freem(control);               /* XXX */
                    296:
                    297:        if (addr) {
                    298:                laddr = inp->inp_laddr;
                    299:                if (inp->inp_faddr.s_addr != INADDR_ANY) {
                    300:                        error = EISCONN;
                    301:                        goto release;
                    302:                }
                    303:                /*
                    304:                 * Must block input while temporarily connected.
                    305:                 */
                    306:                s = splnet();
                    307:                error = in_pcbconnect(inp, addr);
                    308:                if (error) {
                    309:                        splx(s);
                    310:                        goto release;
                    311:                }
                    312:        } else {
                    313:                if (inp->inp_faddr.s_addr == INADDR_ANY) {
                    314:                        error = ENOTCONN;
                    315:                        goto release;
                    316:                }
                    317:        }
                    318:        /*
                    319:         * Calculate data length and get a mbuf
                    320:         * for UDP and IP headers.
                    321:         */
                    322:        M_PREPEND(m, sizeof(struct udpiphdr), M_WAIT);
                    323:
                    324:        /*
                    325:         * Fill in mbuf with extended UDP header
                    326:         * and addresses and length put into network format.
                    327:         */
                    328:        ui = mtod(m, struct udpiphdr *);
                    329:        ui->ui_next = ui->ui_prev = 0;
                    330:        ui->ui_x1 = 0;
                    331:        ui->ui_pr = IPPROTO_UDP;
                    332:        ui->ui_len = htons((u_short)len + sizeof (struct udphdr));
                    333:        ui->ui_src = inp->inp_laddr;
                    334:        ui->ui_dst = inp->inp_faddr;
                    335:        ui->ui_sport = inp->inp_lport;
                    336:        ui->ui_dport = inp->inp_fport;
                    337:        ui->ui_ulen = ui->ui_len;
                    338:
                    339:        /*
                    340:         * Stuff checksum and output datagram.
                    341:         */
                    342:        ui->ui_sum = 0;
                    343:        if (udpcksum) {
                    344:            if ((ui->ui_sum = in_cksum(m, sizeof (struct udpiphdr) + len)) == 0)
                    345:                ui->ui_sum = 0xffff;
                    346:        }
                    347:        ((struct ip *)ui)->ip_len = sizeof (struct udpiphdr) + len;
                    348:        ((struct ip *)ui)->ip_ttl = inp->inp_ip.ip_ttl; /* XXX */
                    349:        ((struct ip *)ui)->ip_tos = inp->inp_ip.ip_tos; /* XXX */
                    350:        udpstat.udps_opackets++;
                    351:        error = ip_output(m, inp->inp_options, &inp->inp_route,
                    352:            inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST));
                    353:
                    354:        if (addr) {
                    355:                in_pcbdisconnect(inp);
                    356:                inp->inp_laddr = laddr;
                    357:                splx(s);
                    358:        }
                    359:        return (error);
                    360:
                    361: release:
                    362:        m_freem(m);
                    363:        return (error);
                    364: }
                    365:
                    366: u_long udp_sendspace = 9216;           /* really max datagram size */
                    367: u_long udp_recvspace = 40 * (1024 + sizeof(struct sockaddr_in));
                    368:                                        /* 40 1K datagrams */
                    369:
                    370: /*ARGSUSED*/
                    371: udp_usrreq(so, req, m, addr, control)
                    372:        struct socket *so;
                    373:        int req;
                    374:        struct mbuf *m, *addr, *control;
                    375: {
                    376:        struct inpcb *inp = sotoinpcb(so);
                    377:        int error = 0;
                    378:        int s;
                    379:
                    380:        if (req == PRU_CONTROL)
                    381:                return (in_control(so, (int)m, (caddr_t)addr,
                    382:                        (struct ifnet *)control));
                    383:        if (inp == NULL && req != PRU_ATTACH) {
                    384:                error = EINVAL;
                    385:                goto release;
                    386:        }
                    387:        /*
                    388:         * Note: need to block udp_input while changing
                    389:         * the udp pcb queue and/or pcb addresses.
                    390:         */
                    391:        switch (req) {
                    392:
                    393:        case PRU_ATTACH:
                    394:                if (inp != NULL) {
                    395:                        error = EINVAL;
                    396:                        break;
                    397:                }
                    398:                s = splnet();
                    399:                error = in_pcballoc(so, &udb);
                    400:                splx(s);
                    401:                if (error)
                    402:                        break;
                    403:                error = soreserve(so, udp_sendspace, udp_recvspace);
                    404:                if (error)
                    405:                        break;
                    406:                ((struct inpcb *) so->so_pcb)->inp_ip.ip_ttl = udp_ttl;
                    407:                break;
                    408:
                    409:        case PRU_DETACH:
                    410:                udp_detach(inp);
                    411:                break;
                    412:
                    413:        case PRU_BIND:
                    414:                s = splnet();
                    415:                error = in_pcbbind(inp, addr);
                    416:                splx(s);
                    417:                break;
                    418:
                    419:        case PRU_LISTEN:
                    420:                error = EOPNOTSUPP;
                    421:                break;
                    422:
                    423:        case PRU_CONNECT:
                    424:                if (inp->inp_faddr.s_addr != INADDR_ANY) {
                    425:                        error = EISCONN;
                    426:                        break;
                    427:                }
                    428:                s = splnet();
                    429:                error = in_pcbconnect(inp, addr);
                    430:                splx(s);
                    431:                if (error == 0)
                    432:                        soisconnected(so);
                    433:                break;
                    434:
                    435:        case PRU_CONNECT2:
                    436:                error = EOPNOTSUPP;
                    437:                break;
                    438:
                    439:        case PRU_ACCEPT:
                    440:                error = EOPNOTSUPP;
                    441:                break;
                    442:
                    443:        case PRU_DISCONNECT:
                    444:                if (inp->inp_faddr.s_addr == INADDR_ANY) {
                    445:                        error = ENOTCONN;
                    446:                        break;
                    447:                }
                    448:                s = splnet();
                    449:                in_pcbdisconnect(inp);
                    450:                inp->inp_laddr.s_addr = INADDR_ANY;
                    451:                splx(s);
                    452:                so->so_state &= ~SS_ISCONNECTED;                /* XXX */
                    453:                break;
                    454:
                    455:        case PRU_SHUTDOWN:
                    456:                socantsendmore(so);
                    457:                break;
                    458:
                    459:        case PRU_SEND:
                    460:                return (udp_output(inp, m, addr, control));
                    461:
                    462:        case PRU_ABORT:
                    463:                soisdisconnected(so);
                    464:                udp_detach(inp);
                    465:                break;
                    466:
                    467:        case PRU_SOCKADDR:
                    468:                in_setsockaddr(inp, addr);
                    469:                break;
                    470:
                    471:        case PRU_PEERADDR:
                    472:                in_setpeeraddr(inp, addr);
                    473:                break;
                    474:
                    475:        case PRU_SENSE:
                    476:                /*
                    477:                 * stat: don't bother with a blocksize.
                    478:                 */
                    479:                return (0);
                    480:
                    481:        case PRU_SENDOOB:
                    482:        case PRU_FASTTIMO:
                    483:        case PRU_SLOWTIMO:
                    484:        case PRU_PROTORCV:
                    485:        case PRU_PROTOSEND:
                    486:                error =  EOPNOTSUPP;
                    487:                break;
                    488:
                    489:        case PRU_RCVD:
                    490:        case PRU_RCVOOB:
                    491:                return (EOPNOTSUPP);    /* do not free mbuf's */
                    492:
                    493:        default:
                    494:                panic("udp_usrreq");
                    495:        }
                    496:
                    497: release:
                    498:        if (control) {
                    499:                printf("udp control data unexpectedly retained\n");
                    500:                m_freem(control);
                    501:        }
                    502:        if (m)
                    503:                m_freem(m);
                    504:        return (error);
                    505: }
                    506:
                    507: udp_detach(inp)
                    508:        struct inpcb *inp;
                    509: {
                    510:        int s = splnet();
                    511:
                    512:        if (inp == udp_last_inpcb)
                    513:                udp_last_inpcb = &udb;
                    514:        in_pcbdetach(inp);
                    515:        splx(s);
                    516: }

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