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Annotation of src/sys/netinet/raw_ip.c, Revision 1.36.10.1

1.36.10.1! thorpej     1: /*     $NetBSD: raw_ip.c,v 1.37 1997/10/14 00:52:54 matt 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;
1.36      thorpej   103:        struct inpcb *last = 0;
                    104:        struct mbuf *opts = 0;
1.32      mycroft   105:        struct sockaddr_in ripsrc;
1.1       cgd       106:
1.32      mycroft   107:        ripsrc.sin_family = AF_INET;
                    108:        ripsrc.sin_len = sizeof(struct sockaddr_in);
1.1       cgd       109:        ripsrc.sin_addr = ip->ip_src;
1.34      mycroft   110:        ripsrc.sin_port = 0;
                    111:        bzero((caddr_t)ripsrc.sin_zero, sizeof(ripsrc.sin_zero));
1.32      mycroft   112:
1.21      cgd       113:        for (inp = rawcbtable.inpt_queue.cqh_first;
                    114:            inp != (struct inpcb *)&rawcbtable.inpt_queue;
                    115:            inp = inp->inp_queue.cqe_next) {
1.13      mycroft   116:                if (inp->inp_ip.ip_p && inp->inp_ip.ip_p != ip->ip_p)
                    117:                        continue;
1.32      mycroft   118:                if (!in_nullhost(inp->inp_laddr) &&
                    119:                    !in_hosteq(inp->inp_laddr, ip->ip_dst))
1.13      mycroft   120:                        continue;
1.32      mycroft   121:                if (!in_nullhost(inp->inp_faddr) &&
                    122:                    !in_hosteq(inp->inp_faddr, ip->ip_src))
1.13      mycroft   123:                        continue;
                    124:                if (last) {
                    125:                        struct mbuf *n;
1.24      christos  126:                        if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) {
1.36      thorpej   127:                                if (last->inp_flags & INP_CONTROLOPTS ||
                    128:                                    last->inp_socket->so_options & SO_TIMESTAMP)
                    129:                                        ip_savecontrol(last, &opts, ip, n);
                    130:                                if (sbappendaddr(&last->inp_socket->so_rcv,
                    131:                                    sintosa(&ripsrc), n, opts) == 0) {
1.13      mycroft   132:                                        /* should notify about lost packet */
                    133:                                        m_freem(n);
1.36      thorpej   134:                                        if (opts)
                    135:                                                m_freem(opts);
                    136:                                } else
                    137:                                        sorwakeup(last->inp_socket);
1.13      mycroft   138:                        }
                    139:                }
1.36      thorpej   140:                last = inp;
1.13      mycroft   141:        }
                    142:        if (last) {
1.36      thorpej   143:                if (last->inp_flags & INP_CONTROLOPTS ||
                    144:                    last->inp_socket->so_options & SO_TIMESTAMP)
                    145:                        ip_savecontrol(last, &opts, ip, m);
                    146:                if (sbappendaddr(&last->inp_socket->so_rcv,
                    147:                    sintosa(&ripsrc), m, opts) == 0) {
1.13      mycroft   148:                        m_freem(m);
1.36      thorpej   149:                        if (opts)
                    150:                                m_freem(opts);
                    151:                } else
                    152:                        sorwakeup(last->inp_socket);
1.13      mycroft   153:        } else {
                    154:                m_freem(m);
1.1       cgd       155:                ipstat.ips_noproto++;
                    156:                ipstat.ips_delivered--;
                    157:        }
                    158: }
                    159:
                    160: /*
                    161:  * Generate IP header and pass packet to ip_output.
                    162:  * Tack on options user may have setup with control call.
                    163:  */
1.9       mycroft   164: int
1.24      christos  165: #if __STDC__
                    166: rip_output(struct mbuf *m, ...)
                    167: #else
                    168: rip_output(m, va_alist)
                    169:        struct mbuf *m;
                    170:        va_dcl
                    171: #endif
                    172: {
1.27      mycroft   173:        register struct inpcb *inp;
1.1       cgd       174:        register struct ip *ip;
1.10      mycroft   175:        struct mbuf *opts;
1.24      christos  176:        int flags;
                    177:        va_list ap;
                    178:
                    179:        va_start(ap, m);
1.27      mycroft   180:        inp = va_arg(ap, struct inpcb *);
1.24      christos  181:        va_end(ap);
                    182:
1.27      mycroft   183:        flags =
1.36.10.1! thorpej   184:            (inp->inp_socket->so_options & SO_DONTROUTE) | IP_ALLOWBROADCAST
        !           185:            | IP_RETURNMTU;
1.1       cgd       186:
                    187:        /*
                    188:         * If the user handed us a complete IP packet, use it.
                    189:         * Otherwise, allocate an mbuf for a header and fill it in.
                    190:         */
1.13      mycroft   191:        if ((inp->inp_flags & INP_HDRINCL) == 0) {
1.35      thorpej   192:                if ((m->m_pkthdr.len + sizeof(struct ip)) > IP_MAXPACKET) {
                    193:                        m_freem(m);
                    194:                        return (EMSGSIZE);
                    195:                }
1.1       cgd       196:                M_PREPEND(m, sizeof(struct ip), M_WAIT);
                    197:                ip = mtod(m, struct ip *);
                    198:                ip->ip_tos = 0;
                    199:                ip->ip_off = 0;
1.13      mycroft   200:                ip->ip_p = inp->inp_ip.ip_p;
1.1       cgd       201:                ip->ip_len = m->m_pkthdr.len;
1.13      mycroft   202:                ip->ip_src = inp->inp_laddr;
1.27      mycroft   203:                ip->ip_dst = inp->inp_faddr;
1.1       cgd       204:                ip->ip_ttl = MAXTTL;
1.13      mycroft   205:                opts = inp->inp_options;
                    206:        } else {
1.35      thorpej   207:                if (m->m_pkthdr.len > IP_MAXPACKET) {
                    208:                        m_freem(m);
                    209:                        return (EMSGSIZE);
                    210:                }
1.13      mycroft   211:                ip = mtod(m, struct ip *);
                    212:                if (ip->ip_id == 0)
                    213:                        ip->ip_id = htons(ip_id++);
                    214:                opts = NULL;
                    215:                /* XXX prevent ip_output from overwriting header fields */
                    216:                flags |= IP_RAWOUTPUT;
                    217:                ipstat.ips_rawout++;
1.1       cgd       218:        }
1.36.10.1! thorpej   219:        return (ip_output(m, opts, &inp->inp_route, flags, inp->inp_moptions, &inp->inp_errormtu));
1.1       cgd       220: }
                    221:
                    222: /*
                    223:  * Raw IP socket option processing.
                    224:  */
1.9       mycroft   225: int
1.1       cgd       226: rip_ctloutput(op, so, level, optname, m)
                    227:        int op;
                    228:        struct socket *so;
                    229:        int level, optname;
                    230:        struct mbuf **m;
                    231: {
1.13      mycroft   232:        register struct inpcb *inp = sotoinpcb(so);
1.31      mycroft   233:        int error = 0;
1.1       cgd       234:
1.15      mycroft   235:        if (level != IPPROTO_IP) {
1.31      mycroft   236:                error = ENOPROTOOPT;
                    237:                if (op == PRCO_SETOPT && *m != 0)
                    238:                        (void) m_free(*m);
                    239:        } else switch (op) {
                    240:
                    241:        case PRCO_SETOPT:
                    242:                switch (optname) {
                    243:                case IP_HDRINCL:
                    244:                        if (*m == 0 || (*m)->m_len < sizeof (int))
                    245:                                error = EINVAL;
                    246:                        else {
1.13      mycroft   247:                                if (*mtod(*m, int *))
                    248:                                        inp->inp_flags |= INP_HDRINCL;
                    249:                                else
                    250:                                        inp->inp_flags &= ~INP_HDRINCL;
                    251:                        }
1.31      mycroft   252:                        if (*m != 0)
                    253:                                (void) m_free(*m);
                    254:                        break;
                    255:
                    256: #ifdef MROUTING
                    257:                case MRT_INIT:
                    258:                case MRT_DONE:
                    259:                case MRT_ADD_VIF:
                    260:                case MRT_DEL_VIF:
                    261:                case MRT_ADD_MFC:
                    262:                case MRT_DEL_MFC:
                    263:                case MRT_ASSERT:
                    264:                        error = ip_mrouter_set(so, optname, m);
                    265:                        break;
                    266: #endif
                    267:
                    268:                default:
                    269:                        error = ip_ctloutput(op, so, level, optname, m);
                    270:                        break;
1.13      mycroft   271:                }
                    272:                break;
1.1       cgd       273:
1.31      mycroft   274:        case PRCO_GETOPT:
                    275:                switch (optname) {
                    276:                case IP_HDRINCL:
                    277:                        *m = m_get(M_WAIT, M_SOOPTS);
                    278:                        (*m)->m_len = sizeof (int);
                    279:                        *mtod(*m, int *) = inp->inp_flags & INP_HDRINCL ? 1 : 0;
                    280:                        break;
                    281:
1.6       hpeyerl   282: #ifdef MROUTING
1.31      mycroft   283:                case MRT_VERSION:
                    284:                case MRT_ASSERT:
                    285:                        error = ip_mrouter_get(so, optname, m);
1.18      mycroft   286:                        break;
1.31      mycroft   287: #endif
                    288:
1.18      mycroft   289:                default:
1.31      mycroft   290:                        error = ip_ctloutput(op, so, level, optname, m);
1.18      mycroft   291:                        break;
                    292:                }
1.31      mycroft   293:                break;
1.1       cgd       294:        }
1.31      mycroft   295:        return (error);
1.1       cgd       296: }
                    297:
1.27      mycroft   298: int
1.29      mycroft   299: rip_bind(inp, nam)
                    300:        struct inpcb *inp;
                    301:        struct mbuf *nam;
                    302: {
                    303:        struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *);
                    304:
                    305:        if (nam->m_len != sizeof(*addr))
                    306:                return (EINVAL);
                    307:        if (ifnet.tqh_first == 0)
                    308:                return (EADDRNOTAVAIL);
                    309:        if (addr->sin_family != AF_INET &&
                    310:            addr->sin_family != AF_IMPLINK)
                    311:                return (EAFNOSUPPORT);
1.32      mycroft   312:        if (!in_nullhost(addr->sin_addr) &&
1.29      mycroft   313:            ifa_ifwithaddr(sintosa(addr)) == 0)
                    314:                return (EADDRNOTAVAIL);
                    315:        inp->inp_laddr = addr->sin_addr;
                    316:        return (0);
                    317: }
                    318:
                    319: int
1.27      mycroft   320: rip_connect(inp, nam)
                    321:        struct inpcb *inp;
                    322:        struct mbuf *nam;
                    323: {
                    324:        struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *);
                    325:
                    326:        if (nam->m_len != sizeof(*addr))
                    327:                return (EINVAL);
                    328:        if (ifnet.tqh_first == 0)
                    329:                return (EADDRNOTAVAIL);
                    330:        if (addr->sin_family != AF_INET &&
                    331:            addr->sin_family != AF_IMPLINK)
                    332:                return (EAFNOSUPPORT);
                    333:        inp->inp_faddr = addr->sin_addr;
                    334:        return (0);
                    335: }
                    336:
                    337: void
                    338: rip_disconnect(inp)
                    339:        struct inpcb *inp;
                    340: {
                    341:
1.32      mycroft   342:        inp->inp_faddr = zeroin_addr;
1.27      mycroft   343: }
                    344:
1.13      mycroft   345: u_long rip_sendspace = RIPSNDQ;
                    346: u_long rip_recvspace = RIPRCVQ;
                    347:
1.1       cgd       348: /*ARGSUSED*/
1.9       mycroft   349: int
1.26      mycroft   350: rip_usrreq(so, req, m, nam, control, p)
1.1       cgd       351:        register struct socket *so;
                    352:        int req;
1.2       cgd       353:        struct mbuf *m, *nam, *control;
1.26      mycroft   354:        struct proc *p;
1.1       cgd       355: {
1.27      mycroft   356:        register struct inpcb *inp;
                    357:        int s;
1.1       cgd       358:        register int error = 0;
1.13      mycroft   359: #ifdef MROUTING
1.6       hpeyerl   360:        extern struct socket *ip_mrouter;
                    361: #endif
1.27      mycroft   362:
1.22      pk        363:        if (req == PRU_CONTROL)
                    364:                return (in_control(so, (long)m, (caddr_t)nam,
1.26      mycroft   365:                    (struct ifnet *)control, p));
1.22      pk        366:
1.27      mycroft   367:        s = splsoftnet();
                    368:        inp = sotoinpcb(so);
1.28      mycroft   369: #ifdef DIAGNOSTIC
                    370:        if (req != PRU_SEND && req != PRU_SENDOOB && control)
                    371:                panic("rip_usrreq: unexpected control mbuf");
                    372: #endif
1.27      mycroft   373:        if (inp == 0 && req != PRU_ATTACH) {
1.22      pk        374:                error = EINVAL;
                    375:                goto release;
                    376:        }
                    377:
1.1       cgd       378:        switch (req) {
                    379:
                    380:        case PRU_ATTACH:
1.27      mycroft   381:                if (inp != 0) {
                    382:                        error = EISCONN;
                    383:                        break;
                    384:                }
1.26      mycroft   385:                if (p == 0 || (error = suser(p->p_ucred, &p->p_acflag))) {
1.13      mycroft   386:                        error = EACCES;
                    387:                        break;
                    388:                }
1.27      mycroft   389:                if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
                    390:                        error = soreserve(so, rip_sendspace, rip_recvspace);
                    391:                        if (error)
                    392:                                break;
                    393:                }
                    394:                error = in_pcballoc(so, &rawcbtable);
                    395:                if (error)
1.13      mycroft   396:                        break;
1.27      mycroft   397:                inp = sotoinpcb(so);
1.17      cgd       398:                inp->inp_ip.ip_p = (long)nam;
1.1       cgd       399:                break;
                    400:
                    401:        case PRU_DETACH:
1.13      mycroft   402: #ifdef MROUTING
1.6       hpeyerl   403:                if (so == ip_mrouter)
                    404:                        ip_mrouter_done();
                    405: #endif
1.13      mycroft   406:                in_pcbdetach(inp);
1.1       cgd       407:                break;
                    408:
                    409:        case PRU_BIND:
1.29      mycroft   410:                error = rip_bind(inp, nam);
1.27      mycroft   411:                break;
                    412:
                    413:        case PRU_LISTEN:
                    414:                error = EOPNOTSUPP;
                    415:                break;
                    416:
                    417:        case PRU_CONNECT:
                    418:                error = rip_connect(inp, nam);
                    419:                if (error)
1.13      mycroft   420:                        break;
1.1       cgd       421:                soisconnected(so);
1.13      mycroft   422:                break;
                    423:
                    424:        case PRU_CONNECT2:
                    425:                error = EOPNOTSUPP;
                    426:                break;
                    427:
1.27      mycroft   428:        case PRU_DISCONNECT:
                    429:                soisdisconnected(so);
                    430:                rip_disconnect(inp);
                    431:                break;
                    432:
1.13      mycroft   433:        /*
                    434:         * Mark the connection as being incapable of further input.
                    435:         */
                    436:        case PRU_SHUTDOWN:
                    437:                socantsendmore(so);
                    438:                break;
                    439:
1.27      mycroft   440:        case PRU_RCVD:
                    441:                error = EOPNOTSUPP;
                    442:                break;
                    443:
1.13      mycroft   444:        /*
                    445:         * Ship a packet out.  The appropriate raw output
                    446:         * routine handles any massaging necessary.
                    447:         */
                    448:        case PRU_SEND:
1.28      mycroft   449:                if (control && control->m_len) {
                    450:                        m_freem(control);
                    451:                        m_freem(m);
                    452:                        error = EINVAL;
                    453:                        break;
                    454:                }
                    455:        {
1.27      mycroft   456:                if (nam) {
                    457:                        if ((so->so_state & SS_ISCONNECTED) != 0) {
1.13      mycroft   458:                                error = EISCONN;
1.28      mycroft   459:                                goto die;
1.13      mycroft   460:                        }
1.27      mycroft   461:                        error = rip_connect(inp, nam);
                    462:                        if (error) {
1.28      mycroft   463:                        die:
1.27      mycroft   464:                                m_freem(m);
                    465:                                break;
                    466:                        }
1.13      mycroft   467:                } else {
1.27      mycroft   468:                        if ((so->so_state & SS_ISCONNECTED) == 0) {
1.13      mycroft   469:                                error = ENOTCONN;
1.28      mycroft   470:                                goto die;
1.13      mycroft   471:                        }
                    472:                }
1.27      mycroft   473:                error = rip_output(m, inp);
                    474:                if (nam)
                    475:                        rip_disconnect(inp);
1.28      mycroft   476:        }
1.13      mycroft   477:                break;
                    478:
                    479:        case PRU_SENSE:
                    480:                /*
                    481:                 * stat: don't bother with a blocksize.
                    482:                 */
1.27      mycroft   483:                splx(s);
1.1       cgd       484:                return (0);
1.13      mycroft   485:
                    486:        case PRU_RCVOOB:
1.27      mycroft   487:                error = EOPNOTSUPP;
                    488:                break;
                    489:
1.13      mycroft   490:        case PRU_SENDOOB:
1.28      mycroft   491:                m_freem(control);
1.27      mycroft   492:                m_freem(m);
1.13      mycroft   493:                error = EOPNOTSUPP;
                    494:                break;
                    495:
                    496:        case PRU_SOCKADDR:
                    497:                in_setsockaddr(inp, nam);
                    498:                break;
                    499:
                    500:        case PRU_PEERADDR:
                    501:                in_setpeeraddr(inp, nam);
                    502:                break;
                    503:
                    504:        default:
                    505:                panic("rip_usrreq");
1.1       cgd       506:        }
1.27      mycroft   507:
1.22      pk        508: release:
1.27      mycroft   509:        splx(s);
1.1       cgd       510:        return (error);
                    511: }

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