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Annotation of src/sys/netinet/raw_ip.c, Revision 1.33

1.33    ! mycroft     1: /*     $NetBSD: raw_ip.c,v 1.32 1996/09/09 14:51:19 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;
1.32      mycroft   109:
1.21      cgd       110:        for (inp = rawcbtable.inpt_queue.cqh_first;
                    111:            inp != (struct inpcb *)&rawcbtable.inpt_queue;
                    112:            inp = inp->inp_queue.cqe_next) {
1.13      mycroft   113:                if (inp->inp_ip.ip_p && inp->inp_ip.ip_p != ip->ip_p)
                    114:                        continue;
1.32      mycroft   115:                if (!in_nullhost(inp->inp_laddr) &&
                    116:                    !in_hosteq(inp->inp_laddr, ip->ip_dst))
1.13      mycroft   117:                        continue;
1.32      mycroft   118:                if (!in_nullhost(inp->inp_faddr) &&
                    119:                    !in_hosteq(inp->inp_faddr, ip->ip_src))
1.13      mycroft   120:                        continue;
                    121:                if (last) {
                    122:                        struct mbuf *n;
1.24      christos  123:                        if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) {
1.13      mycroft   124:                                if (sbappendaddr(&last->so_rcv,
1.19      mycroft   125:                                    sintosa(&ripsrc), n,
                    126:                                    (struct mbuf *)0) == 0)
1.13      mycroft   127:                                        /* should notify about lost packet */
                    128:                                        m_freem(n);
                    129:                                else
                    130:                                        sorwakeup(last);
                    131:                        }
                    132:                }
                    133:                last = inp->inp_socket;
                    134:        }
                    135:        if (last) {
1.19      mycroft   136:                if (sbappendaddr(&last->so_rcv, sintosa(&ripsrc), m,
                    137:                    (struct mbuf *)0) == 0)
1.13      mycroft   138:                        m_freem(m);
                    139:                else
                    140:                        sorwakeup(last);
                    141:        } else {
                    142:                m_freem(m);
1.1       cgd       143:                ipstat.ips_noproto++;
                    144:                ipstat.ips_delivered--;
                    145:        }
                    146: }
                    147:
                    148: /*
                    149:  * Generate IP header and pass packet to ip_output.
                    150:  * Tack on options user may have setup with control call.
                    151:  */
1.9       mycroft   152: int
1.24      christos  153: #if __STDC__
                    154: rip_output(struct mbuf *m, ...)
                    155: #else
                    156: rip_output(m, va_alist)
                    157:        struct mbuf *m;
                    158:        va_dcl
                    159: #endif
                    160: {
1.27      mycroft   161:        register struct inpcb *inp;
1.1       cgd       162:        register struct ip *ip;
1.10      mycroft   163:        struct mbuf *opts;
1.24      christos  164:        int flags;
                    165:        va_list ap;
                    166:
                    167:        va_start(ap, m);
1.27      mycroft   168:        inp = va_arg(ap, struct inpcb *);
1.24      christos  169:        va_end(ap);
                    170:
1.27      mycroft   171:        flags =
                    172:            (inp->inp_socket->so_options & SO_DONTROUTE) | IP_ALLOWBROADCAST;
1.1       cgd       173:
                    174:        /*
                    175:         * If the user handed us a complete IP packet, use it.
                    176:         * Otherwise, allocate an mbuf for a header and fill it in.
                    177:         */
1.13      mycroft   178:        if ((inp->inp_flags & INP_HDRINCL) == 0) {
1.1       cgd       179:                M_PREPEND(m, sizeof(struct ip), M_WAIT);
                    180:                ip = mtod(m, struct ip *);
                    181:                ip->ip_tos = 0;
                    182:                ip->ip_off = 0;
1.13      mycroft   183:                ip->ip_p = inp->inp_ip.ip_p;
1.1       cgd       184:                ip->ip_len = m->m_pkthdr.len;
1.13      mycroft   185:                ip->ip_src = inp->inp_laddr;
1.27      mycroft   186:                ip->ip_dst = inp->inp_faddr;
1.1       cgd       187:                ip->ip_ttl = MAXTTL;
1.13      mycroft   188:                opts = inp->inp_options;
                    189:        } else {
                    190:                ip = mtod(m, struct ip *);
                    191:                if (ip->ip_id == 0)
                    192:                        ip->ip_id = htons(ip_id++);
                    193:                opts = NULL;
                    194:                /* XXX prevent ip_output from overwriting header fields */
                    195:                flags |= IP_RAWOUTPUT;
                    196:                ipstat.ips_rawout++;
1.1       cgd       197:        }
1.13      mycroft   198:        return (ip_output(m, opts, &inp->inp_route, flags, inp->inp_moptions));
1.1       cgd       199: }
                    200:
                    201: /*
                    202:  * Raw IP socket option processing.
                    203:  */
1.9       mycroft   204: int
1.1       cgd       205: rip_ctloutput(op, so, level, optname, m)
                    206:        int op;
                    207:        struct socket *so;
                    208:        int level, optname;
                    209:        struct mbuf **m;
                    210: {
1.13      mycroft   211:        register struct inpcb *inp = sotoinpcb(so);
1.31      mycroft   212:        int error = 0;
1.1       cgd       213:
1.15      mycroft   214:        if (level != IPPROTO_IP) {
1.31      mycroft   215:                error = ENOPROTOOPT;
                    216:                if (op == PRCO_SETOPT && *m != 0)
                    217:                        (void) m_free(*m);
                    218:        } else switch (op) {
                    219:
                    220:        case PRCO_SETOPT:
                    221:                switch (optname) {
                    222:                case IP_HDRINCL:
                    223:                        if (*m == 0 || (*m)->m_len < sizeof (int))
                    224:                                error = EINVAL;
                    225:                        else {
1.13      mycroft   226:                                if (*mtod(*m, int *))
                    227:                                        inp->inp_flags |= INP_HDRINCL;
                    228:                                else
                    229:                                        inp->inp_flags &= ~INP_HDRINCL;
                    230:                        }
1.31      mycroft   231:                        if (*m != 0)
                    232:                                (void) m_free(*m);
                    233:                        break;
                    234:
                    235: #ifdef MROUTING
                    236:                case MRT_INIT:
                    237:                case MRT_DONE:
                    238:                case MRT_ADD_VIF:
                    239:                case MRT_DEL_VIF:
                    240:                case MRT_ADD_MFC:
                    241:                case MRT_DEL_MFC:
                    242:                case MRT_ASSERT:
                    243:                        error = ip_mrouter_set(so, optname, m);
                    244:                        break;
                    245: #endif
                    246:
                    247:                default:
                    248:                        error = ip_ctloutput(op, so, level, optname, m);
                    249:                        break;
1.13      mycroft   250:                }
                    251:                break;
1.1       cgd       252:
1.31      mycroft   253:        case PRCO_GETOPT:
                    254:                switch (optname) {
                    255:                case IP_HDRINCL:
                    256:                        *m = m_get(M_WAIT, M_SOOPTS);
                    257:                        (*m)->m_len = sizeof (int);
                    258:                        *mtod(*m, int *) = inp->inp_flags & INP_HDRINCL ? 1 : 0;
                    259:                        break;
                    260:
1.6       hpeyerl   261: #ifdef MROUTING
1.31      mycroft   262:                case MRT_VERSION:
                    263:                case MRT_ASSERT:
                    264:                        error = ip_mrouter_get(so, optname, m);
1.18      mycroft   265:                        break;
1.31      mycroft   266: #endif
                    267:
1.18      mycroft   268:                default:
1.31      mycroft   269:                        error = ip_ctloutput(op, so, level, optname, m);
1.18      mycroft   270:                        break;
                    271:                }
1.31      mycroft   272:                break;
1.1       cgd       273:        }
1.31      mycroft   274:        return (error);
1.1       cgd       275: }
                    276:
1.27      mycroft   277: int
1.29      mycroft   278: rip_bind(inp, nam)
                    279:        struct inpcb *inp;
                    280:        struct mbuf *nam;
                    281: {
                    282:        struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *);
                    283:
                    284:        if (nam->m_len != sizeof(*addr))
                    285:                return (EINVAL);
                    286:        if (ifnet.tqh_first == 0)
                    287:                return (EADDRNOTAVAIL);
                    288:        if (addr->sin_family != AF_INET &&
                    289:            addr->sin_family != AF_IMPLINK)
                    290:                return (EAFNOSUPPORT);
1.32      mycroft   291:        if (!in_nullhost(addr->sin_addr) &&
1.29      mycroft   292:            ifa_ifwithaddr(sintosa(addr)) == 0)
                    293:                return (EADDRNOTAVAIL);
                    294:        inp->inp_laddr = addr->sin_addr;
                    295:        return (0);
                    296: }
                    297:
                    298: int
1.27      mycroft   299: rip_connect(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);
                    312:        inp->inp_faddr = addr->sin_addr;
                    313:        return (0);
                    314: }
                    315:
                    316: void
                    317: rip_disconnect(inp)
                    318:        struct inpcb *inp;
                    319: {
                    320:
1.32      mycroft   321:        inp->inp_faddr = zeroin_addr;
1.27      mycroft   322: }
                    323:
1.13      mycroft   324: u_long rip_sendspace = RIPSNDQ;
                    325: u_long rip_recvspace = RIPRCVQ;
                    326:
1.1       cgd       327: /*ARGSUSED*/
1.9       mycroft   328: int
1.26      mycroft   329: rip_usrreq(so, req, m, nam, control, p)
1.1       cgd       330:        register struct socket *so;
                    331:        int req;
1.2       cgd       332:        struct mbuf *m, *nam, *control;
1.26      mycroft   333:        struct proc *p;
1.1       cgd       334: {
1.27      mycroft   335:        register struct inpcb *inp;
                    336:        int s;
1.1       cgd       337:        register int error = 0;
1.13      mycroft   338: #ifdef MROUTING
1.6       hpeyerl   339:        extern struct socket *ip_mrouter;
                    340: #endif
1.27      mycroft   341:
1.22      pk        342:        if (req == PRU_CONTROL)
                    343:                return (in_control(so, (long)m, (caddr_t)nam,
1.26      mycroft   344:                    (struct ifnet *)control, p));
1.22      pk        345:
1.27      mycroft   346:        s = splsoftnet();
                    347:        inp = sotoinpcb(so);
1.28      mycroft   348: #ifdef DIAGNOSTIC
                    349:        if (req != PRU_SEND && req != PRU_SENDOOB && control)
                    350:                panic("rip_usrreq: unexpected control mbuf");
                    351: #endif
1.27      mycroft   352:        if (inp == 0 && req != PRU_ATTACH) {
1.22      pk        353:                error = EINVAL;
                    354:                goto release;
                    355:        }
                    356:
1.1       cgd       357:        switch (req) {
                    358:
                    359:        case PRU_ATTACH:
1.27      mycroft   360:                if (inp != 0) {
                    361:                        error = EISCONN;
                    362:                        break;
                    363:                }
1.26      mycroft   364:                if (p == 0 || (error = suser(p->p_ucred, &p->p_acflag))) {
1.13      mycroft   365:                        error = EACCES;
                    366:                        break;
                    367:                }
1.27      mycroft   368:                if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
                    369:                        error = soreserve(so, rip_sendspace, rip_recvspace);
                    370:                        if (error)
                    371:                                break;
                    372:                }
                    373:                error = in_pcballoc(so, &rawcbtable);
                    374:                if (error)
1.13      mycroft   375:                        break;
1.27      mycroft   376:                inp = sotoinpcb(so);
1.17      cgd       377:                inp->inp_ip.ip_p = (long)nam;
1.1       cgd       378:                break;
                    379:
                    380:        case PRU_DETACH:
1.13      mycroft   381: #ifdef MROUTING
1.6       hpeyerl   382:                if (so == ip_mrouter)
                    383:                        ip_mrouter_done();
                    384: #endif
1.13      mycroft   385:                in_pcbdetach(inp);
1.1       cgd       386:                break;
                    387:
                    388:        case PRU_BIND:
1.29      mycroft   389:                error = rip_bind(inp, nam);
1.27      mycroft   390:                break;
                    391:
                    392:        case PRU_LISTEN:
                    393:                error = EOPNOTSUPP;
                    394:                break;
                    395:
                    396:        case PRU_CONNECT:
                    397:                error = rip_connect(inp, nam);
                    398:                if (error)
1.13      mycroft   399:                        break;
1.1       cgd       400:                soisconnected(so);
1.13      mycroft   401:                break;
                    402:
                    403:        case PRU_CONNECT2:
                    404:                error = EOPNOTSUPP;
                    405:                break;
                    406:
1.27      mycroft   407:        case PRU_DISCONNECT:
                    408:                soisdisconnected(so);
                    409:                rip_disconnect(inp);
                    410:                break;
                    411:
1.13      mycroft   412:        /*
                    413:         * Mark the connection as being incapable of further input.
                    414:         */
                    415:        case PRU_SHUTDOWN:
                    416:                socantsendmore(so);
                    417:                break;
                    418:
1.27      mycroft   419:        case PRU_RCVD:
                    420:                error = EOPNOTSUPP;
                    421:                break;
                    422:
1.13      mycroft   423:        /*
                    424:         * Ship a packet out.  The appropriate raw output
                    425:         * routine handles any massaging necessary.
                    426:         */
                    427:        case PRU_SEND:
1.28      mycroft   428:                if (control && control->m_len) {
                    429:                        m_freem(control);
                    430:                        m_freem(m);
                    431:                        error = EINVAL;
                    432:                        break;
                    433:                }
                    434:        {
1.27      mycroft   435:                if (nam) {
                    436:                        if ((so->so_state & SS_ISCONNECTED) != 0) {
1.13      mycroft   437:                                error = EISCONN;
1.28      mycroft   438:                                goto die;
1.13      mycroft   439:                        }
1.27      mycroft   440:                        error = rip_connect(inp, nam);
                    441:                        if (error) {
1.28      mycroft   442:                        die:
1.27      mycroft   443:                                m_freem(m);
                    444:                                break;
                    445:                        }
1.13      mycroft   446:                } else {
1.27      mycroft   447:                        if ((so->so_state & SS_ISCONNECTED) == 0) {
1.13      mycroft   448:                                error = ENOTCONN;
1.28      mycroft   449:                                goto die;
1.13      mycroft   450:                        }
                    451:                }
1.27      mycroft   452:                error = rip_output(m, inp);
                    453:                if (nam)
                    454:                        rip_disconnect(inp);
1.28      mycroft   455:        }
1.13      mycroft   456:                break;
                    457:
                    458:        case PRU_SENSE:
                    459:                /*
                    460:                 * stat: don't bother with a blocksize.
                    461:                 */
1.27      mycroft   462:                splx(s);
1.1       cgd       463:                return (0);
1.13      mycroft   464:
                    465:        case PRU_RCVOOB:
1.27      mycroft   466:                error = EOPNOTSUPP;
                    467:                break;
                    468:
1.13      mycroft   469:        case PRU_SENDOOB:
1.28      mycroft   470:                m_freem(control);
1.27      mycroft   471:                m_freem(m);
1.13      mycroft   472:                error = EOPNOTSUPP;
                    473:                break;
                    474:
                    475:        case PRU_SOCKADDR:
                    476:                in_setsockaddr(inp, nam);
                    477:                break;
                    478:
                    479:        case PRU_PEERADDR:
                    480:                in_setpeeraddr(inp, nam);
                    481:                break;
                    482:
                    483:        default:
                    484:                panic("rip_usrreq");
1.1       cgd       485:        }
1.27      mycroft   486:
1.22      pk        487: release:
1.27      mycroft   488:        splx(s);
1.1       cgd       489:        return (error);
                    490: }

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