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Annotation of src/sys/netinet/udp_usrreq.c, Revision 1.3.4.1

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:  *
1.2       cgd        33:  *     from: @(#)udp_usrreq.c  7.20 (Berkeley) 4/20/91
1.3.4.1 ! mycroft    34:  *     $Id: udp_usrreq.c,v 1.3 1993/05/22 11:42:52 cgd Exp $
1.1       cgd        35:  */
                     36:
                     37: #include "param.h"
                     38: #include "malloc.h"
                     39: #include "mbuf.h"
                     40: #include "protosw.h"
                     41: #include "socket.h"
                     42: #include "socketvar.h"
                     43: #include "stat.h"
1.3.4.1 ! mycroft    44:
        !            45: #include "machine/cpu.h"
1.1       cgd        46:
                     47: #include "../net/if.h"
                     48: #include "../net/route.h"
                     49:
                     50: #include "in.h"
                     51: #include "in_systm.h"
                     52: #include "ip.h"
                     53: #include "in_pcb.h"
                     54: #include "ip_var.h"
                     55: #include "ip_icmp.h"
                     56: #include "udp.h"
                     57: #include "udp_var.h"
                     58:
                     59: struct inpcb *udp_last_inpcb = &udb;
                     60:
                     61: /*
                     62:  * UDP protocol implementation.
                     63:  * Per RFC 768, August, 1980.
                     64:  */
                     65: udp_init()
                     66: {
                     67:
                     68:        udb.inp_next = udb.inp_prev = &udb;
                     69: }
                     70:
                     71: #ifndef        COMPAT_42
                     72: int    udpcksum = 1;
                     73: #else
                     74: int    udpcksum = 0;           /* XXX */
                     75: #endif
                     76: int    udp_ttl = UDP_TTL;
                     77:
                     78: struct sockaddr_in udp_in = { sizeof(udp_in), AF_INET };
                     79:
                     80: udp_input(m, iphlen)
                     81:        register struct mbuf *m;
                     82:        int iphlen;
                     83: {
                     84:        register struct ip *ip;
                     85:        register struct udphdr *uh;
                     86:        register struct inpcb *inp;
                     87:        struct mbuf *opts = 0;
                     88:        int len;
                     89:        struct ip save_ip;
                     90:
                     91:        udpstat.udps_ipackets++;
                     92:
                     93:        /*
                     94:         * Strip IP options, if any; should skip this,
                     95:         * make available to user, and use on returned packets,
                     96:         * but we don't yet have a way to check the checksum
                     97:         * with options still present.
                     98:         */
                     99:        if (iphlen > sizeof (struct ip)) {
                    100:                ip_stripoptions(m, (struct mbuf *)0);
                    101:                iphlen = sizeof(struct ip);
                    102:        }
                    103:
                    104:        /*
                    105:         * Get IP and UDP header together in first mbuf.
                    106:         */
                    107:        ip = mtod(m, struct ip *);
                    108:        if (m->m_len < iphlen + sizeof(struct udphdr)) {
                    109:                if ((m = m_pullup(m, iphlen + sizeof(struct udphdr))) == 0) {
                    110:                        udpstat.udps_hdrops++;
                    111:                        return;
                    112:                }
                    113:                ip = mtod(m, struct ip *);
                    114:        }
                    115:        uh = (struct udphdr *)((caddr_t)ip + iphlen);
                    116:
                    117:        /*
                    118:         * Make mbuf data length reflect UDP length.
                    119:         * If not enough data to reflect UDP length, drop.
                    120:         */
                    121:        len = ntohs((u_short)uh->uh_ulen);
                    122:        if (ip->ip_len != len) {
                    123:                if (len > ip->ip_len) {
                    124:                        udpstat.udps_badlen++;
                    125:                        goto bad;
                    126:                }
                    127:                m_adj(m, len - ip->ip_len);
                    128:                /* ip->ip_len = len; */
                    129:        }
                    130:        /*
                    131:         * Save a copy of the IP header in case we want restore it
                    132:         * for sending an ICMP error message in response.
                    133:         */
                    134:        save_ip = *ip;
                    135:
                    136:        /*
                    137:         * Checksum extended UDP header and data.
                    138:         */
                    139:        if (udpcksum && uh->uh_sum) {
                    140:                ((struct ipovly *)ip)->ih_next = 0;
                    141:                ((struct ipovly *)ip)->ih_prev = 0;
                    142:                ((struct ipovly *)ip)->ih_x1 = 0;
                    143:                ((struct ipovly *)ip)->ih_len = uh->uh_ulen;
                    144:                if (uh->uh_sum = in_cksum(m, len + sizeof (struct ip))) {
                    145:                        udpstat.udps_badsum++;
                    146:                        m_freem(m);
                    147:                        return;
                    148:                }
                    149:        }
                    150:
                    151:        /*
                    152:         * Locate pcb for datagram.
                    153:         */
                    154:        inp = udp_last_inpcb;
                    155:        if (inp->inp_lport != uh->uh_dport ||
                    156:            inp->inp_fport != uh->uh_sport ||
                    157:            inp->inp_faddr.s_addr != ip->ip_src.s_addr ||
                    158:            inp->inp_laddr.s_addr != ip->ip_dst.s_addr) {
                    159:                inp = in_pcblookup(&udb, ip->ip_src, uh->uh_sport,
                    160:                    ip->ip_dst, uh->uh_dport, INPLOOKUP_WILDCARD);
                    161:                if (inp)
                    162:                        udp_last_inpcb = inp;
                    163:                udpstat.udpps_pcbcachemiss++;
                    164:        }
                    165:        if (inp == 0) {
                    166:                /* don't send ICMP response for broadcast packet */
                    167:                udpstat.udps_noport++;
                    168:                if (m->m_flags & M_BCAST) {
                    169:                        udpstat.udps_noportbcast++;
                    170:                        goto bad;
                    171:                }
                    172:                *ip = save_ip;
                    173:                ip->ip_len += iphlen;
                    174:                icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT);
                    175:                return;
                    176:        }
                    177:
                    178:        /*
                    179:         * Construct sockaddr format source address.
                    180:         * Stuff source address and datagram in user buffer.
                    181:         */
                    182:        udp_in.sin_port = uh->uh_sport;
                    183:        udp_in.sin_addr = ip->ip_src;
                    184:        if (inp->inp_flags & INP_CONTROLOPTS) {
                    185:                struct mbuf **mp = &opts;
                    186:                struct mbuf *udp_saveopt();
                    187:
                    188:                if (inp->inp_flags & INP_RECVDSTADDR) {
                    189:                        *mp = udp_saveopt((caddr_t) &ip->ip_dst,
                    190:                            sizeof(struct in_addr), IP_RECVDSTADDR);
                    191:                        if (*mp)
                    192:                                mp = &(*mp)->m_next;
                    193:                }
                    194: #ifdef notyet
                    195:                /* options were tossed above */
                    196:                if (inp->inp_flags & INP_RECVOPTS) {
                    197:                        *mp = udp_saveopt((caddr_t) opts_deleted_above,
                    198:                            sizeof(struct in_addr), IP_RECVOPTS);
                    199:                        if (*mp)
                    200:                                mp = &(*mp)->m_next;
                    201:                }
                    202:                /* ip_srcroute doesn't do what we want here, need to fix */
                    203:                if (inp->inp_flags & INP_RECVRETOPTS) {
                    204:                        *mp = udp_saveopt((caddr_t) ip_srcroute(),
                    205:                            sizeof(struct in_addr), IP_RECVRETOPTS);
                    206:                        if (*mp)
                    207:                                mp = &(*mp)->m_next;
                    208:                }
                    209: #endif
                    210:        }
                    211:        iphlen += sizeof(struct udphdr);
                    212:        m->m_len -= iphlen;
                    213:        m->m_pkthdr.len -= iphlen;
                    214:        m->m_data += iphlen;
                    215:        if (sbappendaddr(&inp->inp_socket->so_rcv, (struct sockaddr *)&udp_in,
                    216:            m, opts) == 0) {
                    217:                udpstat.udps_fullsock++;
                    218:                goto bad;
                    219:        }
                    220:        sorwakeup(inp->inp_socket);
                    221:        return;
                    222: bad:
                    223:        m_freem(m);
                    224:        if (opts)
                    225:                m_freem(opts);
                    226: }
                    227:
                    228: /*
                    229:  * Create a "control" mbuf containing the specified data
                    230:  * with the specified type for presentation with a datagram.
                    231:  */
                    232: struct mbuf *
                    233: udp_saveopt(p, size, type)
                    234:        caddr_t p;
                    235:        register int size;
                    236:        int type;
                    237: {
                    238:        register struct cmsghdr *cp;
                    239:        struct mbuf *m;
                    240:
                    241:        if ((m = m_get(M_DONTWAIT, MT_CONTROL)) == NULL)
                    242:                return ((struct mbuf *) NULL);
                    243:        cp = (struct cmsghdr *) mtod(m, struct cmsghdr *);
                    244:        bcopy(p, (caddr_t)(cp + 1), size);
                    245:        size += sizeof(*cp);
                    246:        m->m_len = size;
                    247:        cp->cmsg_len = size;
                    248:        cp->cmsg_level = IPPROTO_IP;
                    249:        cp->cmsg_type = type;
                    250:        return (m);
                    251: }
                    252:
                    253: /*
                    254:  * Notify a udp user of an asynchronous error;
                    255:  * just wake up so that he can collect error status.
                    256:  */
                    257: udp_notify(inp, errno)
                    258:        register struct inpcb *inp;
                    259: {
                    260:
                    261:        inp->inp_socket->so_error = errno;
                    262:        sorwakeup(inp->inp_socket);
                    263:        sowwakeup(inp->inp_socket);
                    264: }
                    265:
                    266: udp_ctlinput(cmd, sa, ip)
                    267:        int cmd;
                    268:        struct sockaddr *sa;
                    269:        register struct ip *ip;
                    270: {
                    271:        register struct udphdr *uh;
                    272:        extern struct in_addr zeroin_addr;
                    273:        extern u_char inetctlerrmap[];
                    274:
                    275:        if ((unsigned)cmd > PRC_NCMDS || inetctlerrmap[cmd] == 0)
                    276:                return;
                    277:        if (ip) {
                    278:                uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2));
                    279:                in_pcbnotify(&udb, sa, uh->uh_dport, ip->ip_src, uh->uh_sport,
                    280:                        cmd, udp_notify);
                    281:        } else
                    282:                in_pcbnotify(&udb, sa, 0, zeroin_addr, 0, cmd, udp_notify);
                    283: }
                    284:
                    285: udp_output(inp, m, addr, control)
                    286:        register struct inpcb *inp;
                    287:        register struct mbuf *m;
                    288:        struct mbuf *addr, *control;
                    289: {
                    290:        register struct udpiphdr *ui;
                    291:        register int len = m->m_pkthdr.len;
                    292:        struct in_addr laddr;
                    293:        int s, error = 0;
                    294:
                    295:        if (control)
                    296:                m_freem(control);               /* XXX */
                    297:
                    298:        if (addr) {
                    299:                laddr = inp->inp_laddr;
                    300:                if (inp->inp_faddr.s_addr != INADDR_ANY) {
                    301:                        error = EISCONN;
                    302:                        goto release;
                    303:                }
                    304:                /*
                    305:                 * Must block input while temporarily connected.
                    306:                 */
                    307:                s = splnet();
                    308:                error = in_pcbconnect(inp, addr);
                    309:                if (error) {
                    310:                        splx(s);
                    311:                        goto release;
                    312:                }
                    313:        } else {
                    314:                if (inp->inp_faddr.s_addr == INADDR_ANY) {
                    315:                        error = ENOTCONN;
                    316:                        goto release;
                    317:                }
                    318:        }
                    319:        /*
                    320:         * Calculate data length and get a mbuf
                    321:         * for UDP and IP headers.
                    322:         */
                    323:        M_PREPEND(m, sizeof(struct udpiphdr), M_WAIT);
                    324:
                    325:        /*
                    326:         * Fill in mbuf with extended UDP header
                    327:         * and addresses and length put into network format.
                    328:         */
                    329:        ui = mtod(m, struct udpiphdr *);
                    330:        ui->ui_next = ui->ui_prev = 0;
                    331:        ui->ui_x1 = 0;
                    332:        ui->ui_pr = IPPROTO_UDP;
                    333:        ui->ui_len = htons((u_short)len + sizeof (struct udphdr));
                    334:        ui->ui_src = inp->inp_laddr;
                    335:        ui->ui_dst = inp->inp_faddr;
                    336:        ui->ui_sport = inp->inp_lport;
                    337:        ui->ui_dport = inp->inp_fport;
                    338:        ui->ui_ulen = ui->ui_len;
                    339:
                    340:        /*
                    341:         * Stuff checksum and output datagram.
                    342:         */
                    343:        ui->ui_sum = 0;
                    344:        if (udpcksum) {
                    345:            if ((ui->ui_sum = in_cksum(m, sizeof (struct udpiphdr) + len)) == 0)
                    346:                ui->ui_sum = 0xffff;
                    347:        }
                    348:        ((struct ip *)ui)->ip_len = sizeof (struct udpiphdr) + len;
                    349:        ((struct ip *)ui)->ip_ttl = inp->inp_ip.ip_ttl; /* XXX */
                    350:        ((struct ip *)ui)->ip_tos = inp->inp_ip.ip_tos; /* XXX */
                    351:        udpstat.udps_opackets++;
                    352:        error = ip_output(m, inp->inp_options, &inp->inp_route,
                    353:            inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST));
                    354:
                    355:        if (addr) {
                    356:                in_pcbdisconnect(inp);
                    357:                inp->inp_laddr = laddr;
                    358:                splx(s);
                    359:        }
                    360:        return (error);
                    361:
                    362: release:
                    363:        m_freem(m);
                    364:        return (error);
                    365: }
                    366:
                    367: u_long udp_sendspace = 9216;           /* really max datagram size */
                    368: u_long udp_recvspace = 40 * (1024 + sizeof(struct sockaddr_in));
                    369:                                        /* 40 1K datagrams */
                    370:
                    371: /*ARGSUSED*/
                    372: udp_usrreq(so, req, m, addr, control)
                    373:        struct socket *so;
                    374:        int req;
                    375:        struct mbuf *m, *addr, *control;
                    376: {
                    377:        struct inpcb *inp = sotoinpcb(so);
                    378:        int error = 0;
                    379:        int s;
                    380:
                    381:        if (req == PRU_CONTROL)
                    382:                return (in_control(so, (int)m, (caddr_t)addr,
                    383:                        (struct ifnet *)control));
                    384:        if (inp == NULL && req != PRU_ATTACH) {
                    385:                error = EINVAL;
                    386:                goto release;
                    387:        }
                    388:        /*
                    389:         * Note: need to block udp_input while changing
                    390:         * the udp pcb queue and/or pcb addresses.
                    391:         */
                    392:        switch (req) {
                    393:
                    394:        case PRU_ATTACH:
                    395:                if (inp != NULL) {
                    396:                        error = EINVAL;
                    397:                        break;
                    398:                }
                    399:                s = splnet();
                    400:                error = in_pcballoc(so, &udb);
                    401:                splx(s);
                    402:                if (error)
                    403:                        break;
                    404:                error = soreserve(so, udp_sendspace, udp_recvspace);
                    405:                if (error)
                    406:                        break;
                    407:                ((struct inpcb *) so->so_pcb)->inp_ip.ip_ttl = udp_ttl;
                    408:                break;
                    409:
                    410:        case PRU_DETACH:
                    411:                udp_detach(inp);
                    412:                break;
                    413:
                    414:        case PRU_BIND:
                    415:                s = splnet();
                    416:                error = in_pcbbind(inp, addr);
                    417:                splx(s);
                    418:                break;
                    419:
                    420:        case PRU_LISTEN:
                    421:                error = EOPNOTSUPP;
                    422:                break;
                    423:
                    424:        case PRU_CONNECT:
                    425:                if (inp->inp_faddr.s_addr != INADDR_ANY) {
                    426:                        error = EISCONN;
                    427:                        break;
                    428:                }
                    429:                s = splnet();
                    430:                error = in_pcbconnect(inp, addr);
                    431:                splx(s);
                    432:                if (error == 0)
                    433:                        soisconnected(so);
                    434:                break;
                    435:
                    436:        case PRU_CONNECT2:
                    437:                error = EOPNOTSUPP;
                    438:                break;
                    439:
                    440:        case PRU_ACCEPT:
                    441:                error = EOPNOTSUPP;
                    442:                break;
                    443:
                    444:        case PRU_DISCONNECT:
                    445:                if (inp->inp_faddr.s_addr == INADDR_ANY) {
                    446:                        error = ENOTCONN;
                    447:                        break;
                    448:                }
                    449:                s = splnet();
                    450:                in_pcbdisconnect(inp);
                    451:                inp->inp_laddr.s_addr = INADDR_ANY;
                    452:                splx(s);
                    453:                so->so_state &= ~SS_ISCONNECTED;                /* XXX */
                    454:                break;
                    455:
                    456:        case PRU_SHUTDOWN:
                    457:                socantsendmore(so);
                    458:                break;
                    459:
                    460:        case PRU_SEND:
                    461:                return (udp_output(inp, m, addr, control));
                    462:
                    463:        case PRU_ABORT:
                    464:                soisdisconnected(so);
                    465:                udp_detach(inp);
                    466:                break;
                    467:
                    468:        case PRU_SOCKADDR:
                    469:                in_setsockaddr(inp, addr);
                    470:                break;
                    471:
                    472:        case PRU_PEERADDR:
                    473:                in_setpeeraddr(inp, addr);
                    474:                break;
                    475:
                    476:        case PRU_SENSE:
                    477:                /*
                    478:                 * stat: don't bother with a blocksize.
                    479:                 */
                    480:                return (0);
                    481:
                    482:        case PRU_SENDOOB:
                    483:        case PRU_FASTTIMO:
                    484:        case PRU_SLOWTIMO:
                    485:        case PRU_PROTORCV:
                    486:        case PRU_PROTOSEND:
                    487:                error =  EOPNOTSUPP;
                    488:                break;
                    489:
                    490:        case PRU_RCVD:
                    491:        case PRU_RCVOOB:
                    492:                return (EOPNOTSUPP);    /* do not free mbuf's */
                    493:
                    494:        default:
                    495:                panic("udp_usrreq");
                    496:        }
                    497:
                    498: release:
                    499:        if (control) {
                    500:                printf("udp control data unexpectedly retained\n");
                    501:                m_freem(control);
                    502:        }
                    503:        if (m)
                    504:                m_freem(m);
                    505:        return (error);
                    506: }
                    507:
                    508: udp_detach(inp)
                    509:        struct inpcb *inp;
                    510: {
                    511:        int s = splnet();
                    512:
                    513:        if (inp == udp_last_inpcb)
                    514:                udp_last_inpcb = &udb;
                    515:        in_pcbdetach(inp);
                    516:        splx(s);
                    517: }

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