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Annotation of src/sys/netinet/raw_ip.c, Revision 1.27

1.27    ! mycroft     1: /*     $NetBSD: raw_ip.c,v 1.26 1996/05/22 13:55:31 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;
1.13      mycroft    62:
                     63: /*
                     64:  * Nominal space allocated to a raw ip socket.
                     65:  */
                     66: #define        RIPSNDQ         8192
                     67: #define        RIPRCVQ         8192
1.1       cgd        68:
                     69: /*
                     70:  * Raw interface to IP protocol.
                     71:  */
1.13      mycroft    72:
                     73: /*
                     74:  * Initialize raw connection block q.
                     75:  */
                     76: void
                     77: rip_init()
                     78: {
                     79:
1.23      mycroft    80:        in_pcbinit(&rawcbtable, 1);
1.13      mycroft    81: }
                     82:
1.1       cgd        83: struct sockaddr_in ripsrc = { sizeof(ripsrc), AF_INET };
                     84: /*
                     85:  * Setup generic address and protocol structures
                     86:  * for raw_input routine, then pass them along with
                     87:  * mbuf chain.
                     88:  */
1.9       mycroft    89: void
1.24      christos   90: #if __STDC__
                     91: rip_input(struct mbuf *m, ...)
                     92: #else
                     93: rip_input(m, va_alist)
1.1       cgd        94:        struct mbuf *m;
1.24      christos   95:        va_dcl
                     96: #endif
1.1       cgd        97: {
                     98:        register struct ip *ip = mtod(m, struct ip *);
1.13      mycroft    99:        register struct inpcb *inp;
                    100:        struct socket *last = 0;
1.1       cgd       101:
                    102:        ripsrc.sin_addr = ip->ip_src;
1.21      cgd       103:        for (inp = rawcbtable.inpt_queue.cqh_first;
                    104:            inp != (struct inpcb *)&rawcbtable.inpt_queue;
                    105:            inp = inp->inp_queue.cqe_next) {
1.13      mycroft   106:                if (inp->inp_ip.ip_p && inp->inp_ip.ip_p != ip->ip_p)
                    107:                        continue;
1.27    ! mycroft   108:                if (inp->inp_laddr.s_addr != INADDR_ANY &&
1.16      glass     109:                    inp->inp_laddr.s_addr != ip->ip_dst.s_addr)
1.13      mycroft   110:                        continue;
1.27    ! mycroft   111:                if (inp->inp_faddr.s_addr != INADDR_ANY &&
1.16      glass     112:                    inp->inp_faddr.s_addr != ip->ip_src.s_addr)
1.13      mycroft   113:                        continue;
                    114:                if (last) {
                    115:                        struct mbuf *n;
1.24      christos  116:                        if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) {
1.13      mycroft   117:                                if (sbappendaddr(&last->so_rcv,
1.19      mycroft   118:                                    sintosa(&ripsrc), n,
                    119:                                    (struct mbuf *)0) == 0)
1.13      mycroft   120:                                        /* should notify about lost packet */
                    121:                                        m_freem(n);
                    122:                                else
                    123:                                        sorwakeup(last);
                    124:                        }
                    125:                }
                    126:                last = inp->inp_socket;
                    127:        }
                    128:        if (last) {
1.19      mycroft   129:                if (sbappendaddr(&last->so_rcv, sintosa(&ripsrc), m,
                    130:                    (struct mbuf *)0) == 0)
1.13      mycroft   131:                        m_freem(m);
                    132:                else
                    133:                        sorwakeup(last);
                    134:        } else {
                    135:                m_freem(m);
1.1       cgd       136:                ipstat.ips_noproto++;
                    137:                ipstat.ips_delivered--;
                    138:        }
                    139: }
                    140:
                    141: /*
                    142:  * Generate IP header and pass packet to ip_output.
                    143:  * Tack on options user may have setup with control call.
                    144:  */
1.9       mycroft   145: int
1.24      christos  146: #if __STDC__
                    147: rip_output(struct mbuf *m, ...)
                    148: #else
                    149: rip_output(m, va_alist)
                    150:        struct mbuf *m;
                    151:        va_dcl
                    152: #endif
                    153: {
1.27    ! mycroft   154:        register struct inpcb *inp;
1.1       cgd       155:        register struct ip *ip;
1.10      mycroft   156:        struct mbuf *opts;
1.24      christos  157:        int flags;
                    158:        va_list ap;
                    159:
                    160:        va_start(ap, m);
1.27    ! mycroft   161:        inp = va_arg(ap, struct inpcb *);
1.24      christos  162:        va_end(ap);
                    163:
1.27    ! mycroft   164:        flags =
        !           165:            (inp->inp_socket->so_options & SO_DONTROUTE) | IP_ALLOWBROADCAST;
1.1       cgd       166:
                    167:        /*
                    168:         * If the user handed us a complete IP packet, use it.
                    169:         * Otherwise, allocate an mbuf for a header and fill it in.
                    170:         */
1.13      mycroft   171:        if ((inp->inp_flags & INP_HDRINCL) == 0) {
1.1       cgd       172:                M_PREPEND(m, sizeof(struct ip), M_WAIT);
                    173:                ip = mtod(m, struct ip *);
                    174:                ip->ip_tos = 0;
                    175:                ip->ip_off = 0;
1.13      mycroft   176:                ip->ip_p = inp->inp_ip.ip_p;
1.1       cgd       177:                ip->ip_len = m->m_pkthdr.len;
1.13      mycroft   178:                ip->ip_src = inp->inp_laddr;
1.27    ! mycroft   179:                ip->ip_dst = inp->inp_faddr;
1.1       cgd       180:                ip->ip_ttl = MAXTTL;
1.13      mycroft   181:                opts = inp->inp_options;
                    182:        } else {
                    183:                ip = mtod(m, struct ip *);
                    184:                if (ip->ip_id == 0)
                    185:                        ip->ip_id = htons(ip_id++);
                    186:                opts = NULL;
                    187:                /* XXX prevent ip_output from overwriting header fields */
                    188:                flags |= IP_RAWOUTPUT;
                    189:                ipstat.ips_rawout++;
1.1       cgd       190:        }
1.13      mycroft   191:        return (ip_output(m, opts, &inp->inp_route, flags, inp->inp_moptions));
1.1       cgd       192: }
                    193:
                    194: /*
                    195:  * Raw IP socket option processing.
                    196:  */
1.9       mycroft   197: int
1.1       cgd       198: rip_ctloutput(op, so, level, optname, m)
                    199:        int op;
                    200:        struct socket *so;
                    201:        int level, optname;
                    202:        struct mbuf **m;
                    203: {
1.13      mycroft   204:        register struct inpcb *inp = sotoinpcb(so);
1.25      christos  205: #ifdef MROUTING
                    206:        int error;
                    207: #endif
1.1       cgd       208:
1.15      mycroft   209:        if (level != IPPROTO_IP) {
                    210:                if (m != 0 && *m != 0)
                    211:                        (void)m_free(*m);
1.13      mycroft   212:                return (EINVAL);
1.15      mycroft   213:        }
1.1       cgd       214:
1.13      mycroft   215:        switch (optname) {
1.1       cgd       216:
1.13      mycroft   217:        case IP_HDRINCL:
                    218:                if (op == PRCO_SETOPT || op == PRCO_GETOPT) {
                    219:                        if (m == 0 || *m == 0 || (*m)->m_len < sizeof (int))
                    220:                                return (EINVAL);
                    221:                        if (op == PRCO_SETOPT) {
                    222:                                if (*mtod(*m, int *))
                    223:                                        inp->inp_flags |= INP_HDRINCL;
                    224:                                else
                    225:                                        inp->inp_flags &= ~INP_HDRINCL;
                    226:                                (void)m_free(*m);
                    227:                        } else {
                    228:                                (*m)->m_len = sizeof (int);
                    229:                                *mtod(*m, int *) = inp->inp_flags & INP_HDRINCL;
                    230:                        }
                    231:                        return (0);
                    232:                }
                    233:                break;
1.1       cgd       234:
1.18      mycroft   235:        case MRT_INIT:
                    236:        case MRT_DONE:
                    237:        case MRT_ADD_VIF:
                    238:        case MRT_DEL_VIF:
                    239:        case MRT_ADD_MFC:
                    240:        case MRT_DEL_MFC:
                    241:        case MRT_VERSION:
                    242:        case MRT_ASSERT:
1.6       hpeyerl   243: #ifdef MROUTING
1.18      mycroft   244:                switch (op) {
                    245:                case PRCO_SETOPT:
                    246:                        error = ip_mrouter_set(optname, so, m);
                    247:                        break;
                    248:                case PRCO_GETOPT:
                    249:                        error = ip_mrouter_get(optname, so, m);
                    250:                        break;
                    251:                default:
1.13      mycroft   252:                        error = EINVAL;
1.18      mycroft   253:                        break;
                    254:                }
1.13      mycroft   255:                return (error);
1.6       hpeyerl   256: #else
1.13      mycroft   257:                if (op == PRCO_SETOPT && *m)
1.18      mycroft   258:                        m_free(*m);
1.13      mycroft   259:                return (EOPNOTSUPP);
1.6       hpeyerl   260: #endif
1.1       cgd       261:        }
1.13      mycroft   262:        return (ip_ctloutput(op, so, level, optname, m));
1.1       cgd       263: }
                    264:
1.27    ! mycroft   265: int
        !           266: rip_connect(inp, nam)
        !           267:        struct inpcb *inp;
        !           268:        struct mbuf *nam;
        !           269: {
        !           270:        struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *);
        !           271:
        !           272:        if (nam->m_len != sizeof(*addr))
        !           273:                return (EINVAL);
        !           274:        if (ifnet.tqh_first == 0)
        !           275:                return (EADDRNOTAVAIL);
        !           276:        if (addr->sin_family != AF_INET &&
        !           277:            addr->sin_family != AF_IMPLINK)
        !           278:                return (EAFNOSUPPORT);
        !           279:        inp->inp_faddr = addr->sin_addr;
        !           280:        return (0);
        !           281: }
        !           282:
        !           283: void
        !           284: rip_disconnect(inp)
        !           285:        struct inpcb *inp;
        !           286: {
        !           287:
        !           288:        inp->inp_faddr.s_addr = INADDR_ANY;
        !           289: }
        !           290:
1.13      mycroft   291: u_long rip_sendspace = RIPSNDQ;
                    292: u_long rip_recvspace = RIPRCVQ;
                    293:
1.1       cgd       294: /*ARGSUSED*/
1.9       mycroft   295: int
1.26      mycroft   296: rip_usrreq(so, req, m, nam, control, p)
1.1       cgd       297:        register struct socket *so;
                    298:        int req;
1.2       cgd       299:        struct mbuf *m, *nam, *control;
1.26      mycroft   300:        struct proc *p;
1.1       cgd       301: {
1.27    ! mycroft   302:        register struct inpcb *inp;
        !           303:        int s;
1.1       cgd       304:        register int error = 0;
1.13      mycroft   305: #ifdef MROUTING
1.6       hpeyerl   306:        extern struct socket *ip_mrouter;
                    307: #endif
1.27    ! mycroft   308:
1.22      pk        309:        if (req == PRU_CONTROL)
                    310:                return (in_control(so, (long)m, (caddr_t)nam,
1.26      mycroft   311:                    (struct ifnet *)control, p));
1.22      pk        312:
1.27    ! mycroft   313:        s = splsoftnet();
        !           314:        inp = sotoinpcb(so);
        !           315:        if (control && control->m_len) {
        !           316:                m_freem(control);
        !           317:                error = EINVAL;
        !           318:                goto release;
        !           319:        }
        !           320:        if (inp == 0 && req != PRU_ATTACH) {
1.22      pk        321:                error = EINVAL;
                    322:                goto release;
                    323:        }
                    324:
1.1       cgd       325:        switch (req) {
                    326:
                    327:        case PRU_ATTACH:
1.27    ! mycroft   328:                if (inp != 0) {
        !           329:                        error = EISCONN;
        !           330:                        break;
        !           331:                }
1.26      mycroft   332:                if (p == 0 || (error = suser(p->p_ucred, &p->p_acflag))) {
1.13      mycroft   333:                        error = EACCES;
                    334:                        break;
                    335:                }
1.27    ! mycroft   336:                if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
        !           337:                        error = soreserve(so, rip_sendspace, rip_recvspace);
        !           338:                        if (error)
        !           339:                                break;
        !           340:                }
        !           341:                error = in_pcballoc(so, &rawcbtable);
        !           342:                if (error)
1.13      mycroft   343:                        break;
1.27    ! mycroft   344:                inp = sotoinpcb(so);
1.17      cgd       345:                inp->inp_ip.ip_p = (long)nam;
1.1       cgd       346:                break;
                    347:
                    348:        case PRU_DETACH:
1.13      mycroft   349: #ifdef MROUTING
1.6       hpeyerl   350:                if (so == ip_mrouter)
                    351:                        ip_mrouter_done();
                    352: #endif
1.13      mycroft   353:                in_pcbdetach(inp);
1.1       cgd       354:                break;
                    355:
                    356:        case PRU_BIND:
                    357:            {
                    358:                struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *);
                    359:
1.13      mycroft   360:                if (nam->m_len != sizeof(*addr)) {
                    361:                        error = EINVAL;
                    362:                        break;
                    363:                }
1.27    ! mycroft   364:                if (ifnet.tqh_first == 0) {
1.13      mycroft   365:                        error = EADDRNOTAVAIL;
                    366:                        break;
                    367:                }
1.27    ! mycroft   368:                if (addr->sin_family != AF_INET &&
        !           369:                    addr->sin_family != AF_IMPLINK) {
        !           370:                        error = EAFNOSUPPORT;
1.13      mycroft   371:                        break;
                    372:                }
1.27    ! mycroft   373:                if (addr->sin_addr.s_addr != INADDR_ANY &&
        !           374:                    ifa_ifwithaddr(sintosa(addr)) == 0) {
1.13      mycroft   375:                        error = EADDRNOTAVAIL;
                    376:                        break;
                    377:                }
1.27    ! mycroft   378:                inp->inp_laddr = addr->sin_addr;
        !           379:                break;
        !           380:            }
        !           381:
        !           382:        case PRU_LISTEN:
        !           383:                error = EOPNOTSUPP;
        !           384:                break;
        !           385:
        !           386:        case PRU_CONNECT:
        !           387:                error = rip_connect(inp, nam);
        !           388:                if (error)
1.13      mycroft   389:                        break;
1.1       cgd       390:                soisconnected(so);
1.13      mycroft   391:                break;
                    392:
                    393:        case PRU_CONNECT2:
                    394:                error = EOPNOTSUPP;
                    395:                break;
                    396:
1.27    ! mycroft   397:        case PRU_DISCONNECT:
        !           398:                soisdisconnected(so);
        !           399:                rip_disconnect(inp);
        !           400:                break;
        !           401:
1.13      mycroft   402:        /*
                    403:         * Mark the connection as being incapable of further input.
                    404:         */
                    405:        case PRU_SHUTDOWN:
                    406:                socantsendmore(so);
                    407:                break;
                    408:
1.27    ! mycroft   409:        case PRU_RCVD:
        !           410:                error = EOPNOTSUPP;
        !           411:                break;
        !           412:
1.13      mycroft   413:        /*
                    414:         * Ship a packet out.  The appropriate raw output
                    415:         * routine handles any massaging necessary.
                    416:         */
                    417:        case PRU_SEND:
                    418:            {
1.27    ! mycroft   419:                struct in_addr faddr;
1.13      mycroft   420:
1.27    ! mycroft   421:                if (nam) {
        !           422:                        if ((so->so_state & SS_ISCONNECTED) != 0) {
        !           423:                                m_freem(m);
1.13      mycroft   424:                                error = EISCONN;
                    425:                                break;
                    426:                        }
1.27    ! mycroft   427:                        error = rip_connect(inp, nam);
        !           428:                        if (error) {
        !           429:                                m_freem(m);
        !           430:                                break;
        !           431:                        }
1.13      mycroft   432:                } else {
1.27    ! mycroft   433:                        if ((so->so_state & SS_ISCONNECTED) == 0) {
        !           434:                                m_freem(m);
1.13      mycroft   435:                                error = ENOTCONN;
                    436:                                break;
                    437:                        }
                    438:                }
1.27    ! mycroft   439:                error = rip_output(m, inp);
        !           440:                if (nam)
        !           441:                        rip_disconnect(inp);
1.13      mycroft   442:                break;
                    443:            }
                    444:
                    445:        case PRU_SENSE:
                    446:                /*
                    447:                 * stat: don't bother with a blocksize.
                    448:                 */
1.27    ! mycroft   449:                splx(s);
1.1       cgd       450:                return (0);
1.13      mycroft   451:
                    452:        case PRU_RCVOOB:
1.27    ! mycroft   453:                error = EOPNOTSUPP;
        !           454:                break;
        !           455:
1.13      mycroft   456:        case PRU_SENDOOB:
1.27    ! mycroft   457:                m_freem(m);
1.13      mycroft   458:                error = EOPNOTSUPP;
                    459:                break;
                    460:
                    461:        case PRU_SOCKADDR:
                    462:                in_setsockaddr(inp, nam);
                    463:                break;
                    464:
                    465:        case PRU_PEERADDR:
                    466:                in_setpeeraddr(inp, nam);
                    467:                break;
                    468:
                    469:        default:
                    470:                panic("rip_usrreq");
1.1       cgd       471:        }
1.27    ! mycroft   472:
1.22      pk        473: release:
1.27    ! mycroft   474:        splx(s);
1.1       cgd       475:        return (error);
                    476: }

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