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Annotation of src/sys/netinet/raw_ip.c, Revision 1.35

1.35    ! thorpej     1: /*     $NetBSD: raw_ip.c,v 1.34 1996/09/16 17:45:17 mycroft Exp $      */
1.14      cgd         2:
1.1       cgd         3: /*
1.13      mycroft     4:  * Copyright (c) 1982, 1986, 1988, 1993
                      5:  *     The Regents of the University of California.  All rights reserved.
1.1       cgd         6:  *
                      7:  * Redistribution and use in source and binary forms, with or without
                      8:  * modification, are permitted provided that the following conditions
                      9:  * are met:
                     10:  * 1. Redistributions of source code must retain the above copyright
                     11:  *    notice, this list of conditions and the following disclaimer.
                     12:  * 2. Redistributions in binary form must reproduce the above copyright
                     13:  *    notice, this list of conditions and the following disclaimer in the
                     14:  *    documentation and/or other materials provided with the distribution.
                     15:  * 3. All advertising materials mentioning features or use of this software
                     16:  *    must display the following acknowledgement:
                     17:  *     This product includes software developed by the University of
                     18:  *     California, Berkeley and its contributors.
                     19:  * 4. Neither the name of the University nor the names of its contributors
                     20:  *    may be used to endorse or promote products derived from this software
                     21:  *    without specific prior written permission.
                     22:  *
                     23:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     24:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     25:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     26:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     27:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     28:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     29:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     30:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     31:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     32:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     33:  * SUCH DAMAGE.
                     34:  *
1.14      cgd        35:  *     @(#)raw_ip.c    8.2 (Berkeley) 1/4/94
1.1       cgd        36:  */
                     37:
1.7       mycroft    38: #include <sys/param.h>
                     39: #include <sys/malloc.h>
                     40: #include <sys/mbuf.h>
                     41: #include <sys/socket.h>
                     42: #include <sys/protosw.h>
                     43: #include <sys/socketvar.h>
                     44: #include <sys/errno.h>
1.13      mycroft    45: #include <sys/systm.h>
1.26      mycroft    46: #include <sys/proc.h>
1.1       cgd        47:
1.7       mycroft    48: #include <net/if.h>
                     49: #include <net/route.h>
1.1       cgd        50:
1.7       mycroft    51: #include <netinet/in.h>
                     52: #include <netinet/in_systm.h>
                     53: #include <netinet/ip.h>
                     54: #include <netinet/ip_var.h>
1.13      mycroft    55: #include <netinet/ip_mroute.h>
1.7       mycroft    56: #include <netinet/in_pcb.h>
1.24      christos   57: #include <netinet/in_var.h>
                     58:
                     59: #include <machine/stdarg.h>
1.13      mycroft    60:
1.20      mycroft    61: struct inpcbtable rawcbtable;
1.30      pk         62:
                     63: int     rip_bind __P((struct inpcb *, struct mbuf *));
                     64: int     rip_connect __P((struct inpcb *, struct mbuf *));
                     65: void    rip_disconnect __P((struct inpcb *));
1.13      mycroft    66:
                     67: /*
                     68:  * Nominal space allocated to a raw ip socket.
                     69:  */
                     70: #define        RIPSNDQ         8192
                     71: #define        RIPRCVQ         8192
1.1       cgd        72:
                     73: /*
                     74:  * Raw interface to IP protocol.
                     75:  */
1.13      mycroft    76:
                     77: /*
                     78:  * Initialize raw connection block q.
                     79:  */
                     80: void
                     81: rip_init()
                     82: {
                     83:
1.33      mycroft    84:        in_pcbinit(&rawcbtable, 1, 1);
1.13      mycroft    85: }
                     86:
1.1       cgd        87: /*
                     88:  * Setup generic address and protocol structures
                     89:  * for raw_input routine, then pass them along with
                     90:  * mbuf chain.
                     91:  */
1.9       mycroft    92: void
1.24      christos   93: #if __STDC__
                     94: rip_input(struct mbuf *m, ...)
                     95: #else
                     96: rip_input(m, va_alist)
1.1       cgd        97:        struct mbuf *m;
1.24      christos   98:        va_dcl
                     99: #endif
1.1       cgd       100: {
                    101:        register struct ip *ip = mtod(m, struct ip *);
1.13      mycroft   102:        register struct inpcb *inp;
                    103:        struct socket *last = 0;
1.32      mycroft   104:        struct sockaddr_in ripsrc;
1.1       cgd       105:
1.32      mycroft   106:        ripsrc.sin_family = AF_INET;
                    107:        ripsrc.sin_len = sizeof(struct sockaddr_in);
1.1       cgd       108:        ripsrc.sin_addr = ip->ip_src;
1.34      mycroft   109:        ripsrc.sin_port = 0;
                    110:        bzero((caddr_t)ripsrc.sin_zero, sizeof(ripsrc.sin_zero));
1.32      mycroft   111:
1.21      cgd       112:        for (inp = rawcbtable.inpt_queue.cqh_first;
                    113:            inp != (struct inpcb *)&rawcbtable.inpt_queue;
                    114:            inp = inp->inp_queue.cqe_next) {
1.13      mycroft   115:                if (inp->inp_ip.ip_p && inp->inp_ip.ip_p != ip->ip_p)
                    116:                        continue;
1.32      mycroft   117:                if (!in_nullhost(inp->inp_laddr) &&
                    118:                    !in_hosteq(inp->inp_laddr, ip->ip_dst))
1.13      mycroft   119:                        continue;
1.32      mycroft   120:                if (!in_nullhost(inp->inp_faddr) &&
                    121:                    !in_hosteq(inp->inp_faddr, ip->ip_src))
1.13      mycroft   122:                        continue;
                    123:                if (last) {
                    124:                        struct mbuf *n;
1.24      christos  125:                        if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) {
1.13      mycroft   126:                                if (sbappendaddr(&last->so_rcv,
1.19      mycroft   127:                                    sintosa(&ripsrc), n,
                    128:                                    (struct mbuf *)0) == 0)
1.13      mycroft   129:                                        /* should notify about lost packet */
                    130:                                        m_freem(n);
                    131:                                else
                    132:                                        sorwakeup(last);
                    133:                        }
                    134:                }
                    135:                last = inp->inp_socket;
                    136:        }
                    137:        if (last) {
1.19      mycroft   138:                if (sbappendaddr(&last->so_rcv, sintosa(&ripsrc), m,
                    139:                    (struct mbuf *)0) == 0)
1.13      mycroft   140:                        m_freem(m);
                    141:                else
                    142:                        sorwakeup(last);
                    143:        } else {
                    144:                m_freem(m);
1.1       cgd       145:                ipstat.ips_noproto++;
                    146:                ipstat.ips_delivered--;
                    147:        }
                    148: }
                    149:
                    150: /*
                    151:  * Generate IP header and pass packet to ip_output.
                    152:  * Tack on options user may have setup with control call.
                    153:  */
1.9       mycroft   154: int
1.24      christos  155: #if __STDC__
                    156: rip_output(struct mbuf *m, ...)
                    157: #else
                    158: rip_output(m, va_alist)
                    159:        struct mbuf *m;
                    160:        va_dcl
                    161: #endif
                    162: {
1.27      mycroft   163:        register struct inpcb *inp;
1.1       cgd       164:        register struct ip *ip;
1.10      mycroft   165:        struct mbuf *opts;
1.24      christos  166:        int flags;
                    167:        va_list ap;
                    168:
                    169:        va_start(ap, m);
1.27      mycroft   170:        inp = va_arg(ap, struct inpcb *);
1.24      christos  171:        va_end(ap);
                    172:
1.27      mycroft   173:        flags =
                    174:            (inp->inp_socket->so_options & SO_DONTROUTE) | IP_ALLOWBROADCAST;
1.1       cgd       175:
                    176:        /*
                    177:         * If the user handed us a complete IP packet, use it.
                    178:         * Otherwise, allocate an mbuf for a header and fill it in.
                    179:         */
1.13      mycroft   180:        if ((inp->inp_flags & INP_HDRINCL) == 0) {
1.35    ! thorpej   181:                if ((m->m_pkthdr.len + sizeof(struct ip)) > IP_MAXPACKET) {
        !           182:                        m_freem(m);
        !           183:                        return (EMSGSIZE);
        !           184:                }
1.1       cgd       185:                M_PREPEND(m, sizeof(struct ip), M_WAIT);
                    186:                ip = mtod(m, struct ip *);
                    187:                ip->ip_tos = 0;
                    188:                ip->ip_off = 0;
1.13      mycroft   189:                ip->ip_p = inp->inp_ip.ip_p;
1.1       cgd       190:                ip->ip_len = m->m_pkthdr.len;
1.13      mycroft   191:                ip->ip_src = inp->inp_laddr;
1.27      mycroft   192:                ip->ip_dst = inp->inp_faddr;
1.1       cgd       193:                ip->ip_ttl = MAXTTL;
1.13      mycroft   194:                opts = inp->inp_options;
                    195:        } else {
1.35    ! thorpej   196:                if (m->m_pkthdr.len > IP_MAXPACKET) {
        !           197:                        m_freem(m);
        !           198:                        return (EMSGSIZE);
        !           199:                }
1.13      mycroft   200:                ip = mtod(m, struct ip *);
                    201:                if (ip->ip_id == 0)
                    202:                        ip->ip_id = htons(ip_id++);
                    203:                opts = NULL;
                    204:                /* XXX prevent ip_output from overwriting header fields */
                    205:                flags |= IP_RAWOUTPUT;
                    206:                ipstat.ips_rawout++;
1.1       cgd       207:        }
1.13      mycroft   208:        return (ip_output(m, opts, &inp->inp_route, flags, inp->inp_moptions));
1.1       cgd       209: }
                    210:
                    211: /*
                    212:  * Raw IP socket option processing.
                    213:  */
1.9       mycroft   214: int
1.1       cgd       215: rip_ctloutput(op, so, level, optname, m)
                    216:        int op;
                    217:        struct socket *so;
                    218:        int level, optname;
                    219:        struct mbuf **m;
                    220: {
1.13      mycroft   221:        register struct inpcb *inp = sotoinpcb(so);
1.31      mycroft   222:        int error = 0;
1.1       cgd       223:
1.15      mycroft   224:        if (level != IPPROTO_IP) {
1.31      mycroft   225:                error = ENOPROTOOPT;
                    226:                if (op == PRCO_SETOPT && *m != 0)
                    227:                        (void) m_free(*m);
                    228:        } else switch (op) {
                    229:
                    230:        case PRCO_SETOPT:
                    231:                switch (optname) {
                    232:                case IP_HDRINCL:
                    233:                        if (*m == 0 || (*m)->m_len < sizeof (int))
                    234:                                error = EINVAL;
                    235:                        else {
1.13      mycroft   236:                                if (*mtod(*m, int *))
                    237:                                        inp->inp_flags |= INP_HDRINCL;
                    238:                                else
                    239:                                        inp->inp_flags &= ~INP_HDRINCL;
                    240:                        }
1.31      mycroft   241:                        if (*m != 0)
                    242:                                (void) m_free(*m);
                    243:                        break;
                    244:
                    245: #ifdef MROUTING
                    246:                case MRT_INIT:
                    247:                case MRT_DONE:
                    248:                case MRT_ADD_VIF:
                    249:                case MRT_DEL_VIF:
                    250:                case MRT_ADD_MFC:
                    251:                case MRT_DEL_MFC:
                    252:                case MRT_ASSERT:
                    253:                        error = ip_mrouter_set(so, optname, m);
                    254:                        break;
                    255: #endif
                    256:
                    257:                default:
                    258:                        error = ip_ctloutput(op, so, level, optname, m);
                    259:                        break;
1.13      mycroft   260:                }
                    261:                break;
1.1       cgd       262:
1.31      mycroft   263:        case PRCO_GETOPT:
                    264:                switch (optname) {
                    265:                case IP_HDRINCL:
                    266:                        *m = m_get(M_WAIT, M_SOOPTS);
                    267:                        (*m)->m_len = sizeof (int);
                    268:                        *mtod(*m, int *) = inp->inp_flags & INP_HDRINCL ? 1 : 0;
                    269:                        break;
                    270:
1.6       hpeyerl   271: #ifdef MROUTING
1.31      mycroft   272:                case MRT_VERSION:
                    273:                case MRT_ASSERT:
                    274:                        error = ip_mrouter_get(so, optname, m);
1.18      mycroft   275:                        break;
1.31      mycroft   276: #endif
                    277:
1.18      mycroft   278:                default:
1.31      mycroft   279:                        error = ip_ctloutput(op, so, level, optname, m);
1.18      mycroft   280:                        break;
                    281:                }
1.31      mycroft   282:                break;
1.1       cgd       283:        }
1.31      mycroft   284:        return (error);
1.1       cgd       285: }
                    286:
1.27      mycroft   287: int
1.29      mycroft   288: rip_bind(inp, nam)
                    289:        struct inpcb *inp;
                    290:        struct mbuf *nam;
                    291: {
                    292:        struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *);
                    293:
                    294:        if (nam->m_len != sizeof(*addr))
                    295:                return (EINVAL);
                    296:        if (ifnet.tqh_first == 0)
                    297:                return (EADDRNOTAVAIL);
                    298:        if (addr->sin_family != AF_INET &&
                    299:            addr->sin_family != AF_IMPLINK)
                    300:                return (EAFNOSUPPORT);
1.32      mycroft   301:        if (!in_nullhost(addr->sin_addr) &&
1.29      mycroft   302:            ifa_ifwithaddr(sintosa(addr)) == 0)
                    303:                return (EADDRNOTAVAIL);
                    304:        inp->inp_laddr = addr->sin_addr;
                    305:        return (0);
                    306: }
                    307:
                    308: int
1.27      mycroft   309: rip_connect(inp, nam)
                    310:        struct inpcb *inp;
                    311:        struct mbuf *nam;
                    312: {
                    313:        struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *);
                    314:
                    315:        if (nam->m_len != sizeof(*addr))
                    316:                return (EINVAL);
                    317:        if (ifnet.tqh_first == 0)
                    318:                return (EADDRNOTAVAIL);
                    319:        if (addr->sin_family != AF_INET &&
                    320:            addr->sin_family != AF_IMPLINK)
                    321:                return (EAFNOSUPPORT);
                    322:        inp->inp_faddr = addr->sin_addr;
                    323:        return (0);
                    324: }
                    325:
                    326: void
                    327: rip_disconnect(inp)
                    328:        struct inpcb *inp;
                    329: {
                    330:
1.32      mycroft   331:        inp->inp_faddr = zeroin_addr;
1.27      mycroft   332: }
                    333:
1.13      mycroft   334: u_long rip_sendspace = RIPSNDQ;
                    335: u_long rip_recvspace = RIPRCVQ;
                    336:
1.1       cgd       337: /*ARGSUSED*/
1.9       mycroft   338: int
1.26      mycroft   339: rip_usrreq(so, req, m, nam, control, p)
1.1       cgd       340:        register struct socket *so;
                    341:        int req;
1.2       cgd       342:        struct mbuf *m, *nam, *control;
1.26      mycroft   343:        struct proc *p;
1.1       cgd       344: {
1.27      mycroft   345:        register struct inpcb *inp;
                    346:        int s;
1.1       cgd       347:        register int error = 0;
1.13      mycroft   348: #ifdef MROUTING
1.6       hpeyerl   349:        extern struct socket *ip_mrouter;
                    350: #endif
1.27      mycroft   351:
1.22      pk        352:        if (req == PRU_CONTROL)
                    353:                return (in_control(so, (long)m, (caddr_t)nam,
1.26      mycroft   354:                    (struct ifnet *)control, p));
1.22      pk        355:
1.27      mycroft   356:        s = splsoftnet();
                    357:        inp = sotoinpcb(so);
1.28      mycroft   358: #ifdef DIAGNOSTIC
                    359:        if (req != PRU_SEND && req != PRU_SENDOOB && control)
                    360:                panic("rip_usrreq: unexpected control mbuf");
                    361: #endif
1.27      mycroft   362:        if (inp == 0 && req != PRU_ATTACH) {
1.22      pk        363:                error = EINVAL;
                    364:                goto release;
                    365:        }
                    366:
1.1       cgd       367:        switch (req) {
                    368:
                    369:        case PRU_ATTACH:
1.27      mycroft   370:                if (inp != 0) {
                    371:                        error = EISCONN;
                    372:                        break;
                    373:                }
1.26      mycroft   374:                if (p == 0 || (error = suser(p->p_ucred, &p->p_acflag))) {
1.13      mycroft   375:                        error = EACCES;
                    376:                        break;
                    377:                }
1.27      mycroft   378:                if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
                    379:                        error = soreserve(so, rip_sendspace, rip_recvspace);
                    380:                        if (error)
                    381:                                break;
                    382:                }
                    383:                error = in_pcballoc(so, &rawcbtable);
                    384:                if (error)
1.13      mycroft   385:                        break;
1.27      mycroft   386:                inp = sotoinpcb(so);
1.17      cgd       387:                inp->inp_ip.ip_p = (long)nam;
1.1       cgd       388:                break;
                    389:
                    390:        case PRU_DETACH:
1.13      mycroft   391: #ifdef MROUTING
1.6       hpeyerl   392:                if (so == ip_mrouter)
                    393:                        ip_mrouter_done();
                    394: #endif
1.13      mycroft   395:                in_pcbdetach(inp);
1.1       cgd       396:                break;
                    397:
                    398:        case PRU_BIND:
1.29      mycroft   399:                error = rip_bind(inp, nam);
1.27      mycroft   400:                break;
                    401:
                    402:        case PRU_LISTEN:
                    403:                error = EOPNOTSUPP;
                    404:                break;
                    405:
                    406:        case PRU_CONNECT:
                    407:                error = rip_connect(inp, nam);
                    408:                if (error)
1.13      mycroft   409:                        break;
1.1       cgd       410:                soisconnected(so);
1.13      mycroft   411:                break;
                    412:
                    413:        case PRU_CONNECT2:
                    414:                error = EOPNOTSUPP;
                    415:                break;
                    416:
1.27      mycroft   417:        case PRU_DISCONNECT:
                    418:                soisdisconnected(so);
                    419:                rip_disconnect(inp);
                    420:                break;
                    421:
1.13      mycroft   422:        /*
                    423:         * Mark the connection as being incapable of further input.
                    424:         */
                    425:        case PRU_SHUTDOWN:
                    426:                socantsendmore(so);
                    427:                break;
                    428:
1.27      mycroft   429:        case PRU_RCVD:
                    430:                error = EOPNOTSUPP;
                    431:                break;
                    432:
1.13      mycroft   433:        /*
                    434:         * Ship a packet out.  The appropriate raw output
                    435:         * routine handles any massaging necessary.
                    436:         */
                    437:        case PRU_SEND:
1.28      mycroft   438:                if (control && control->m_len) {
                    439:                        m_freem(control);
                    440:                        m_freem(m);
                    441:                        error = EINVAL;
                    442:                        break;
                    443:                }
                    444:        {
1.27      mycroft   445:                if (nam) {
                    446:                        if ((so->so_state & SS_ISCONNECTED) != 0) {
1.13      mycroft   447:                                error = EISCONN;
1.28      mycroft   448:                                goto die;
1.13      mycroft   449:                        }
1.27      mycroft   450:                        error = rip_connect(inp, nam);
                    451:                        if (error) {
1.28      mycroft   452:                        die:
1.27      mycroft   453:                                m_freem(m);
                    454:                                break;
                    455:                        }
1.13      mycroft   456:                } else {
1.27      mycroft   457:                        if ((so->so_state & SS_ISCONNECTED) == 0) {
1.13      mycroft   458:                                error = ENOTCONN;
1.28      mycroft   459:                                goto die;
1.13      mycroft   460:                        }
                    461:                }
1.27      mycroft   462:                error = rip_output(m, inp);
                    463:                if (nam)
                    464:                        rip_disconnect(inp);
1.28      mycroft   465:        }
1.13      mycroft   466:                break;
                    467:
                    468:        case PRU_SENSE:
                    469:                /*
                    470:                 * stat: don't bother with a blocksize.
                    471:                 */
1.27      mycroft   472:                splx(s);
1.1       cgd       473:                return (0);
1.13      mycroft   474:
                    475:        case PRU_RCVOOB:
1.27      mycroft   476:                error = EOPNOTSUPP;
                    477:                break;
                    478:
1.13      mycroft   479:        case PRU_SENDOOB:
1.28      mycroft   480:                m_freem(control);
1.27      mycroft   481:                m_freem(m);
1.13      mycroft   482:                error = EOPNOTSUPP;
                    483:                break;
                    484:
                    485:        case PRU_SOCKADDR:
                    486:                in_setsockaddr(inp, nam);
                    487:                break;
                    488:
                    489:        case PRU_PEERADDR:
                    490:                in_setpeeraddr(inp, nam);
                    491:                break;
                    492:
                    493:        default:
                    494:                panic("rip_usrreq");
1.1       cgd       495:        }
1.27      mycroft   496:
1.22      pk        497: release:
1.27      mycroft   498:        splx(s);
1.1       cgd       499:        return (error);
                    500: }

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