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Annotation of src/sys/netinet/raw_ip.c, Revision 1.7

1.1       cgd         1: /*
                      2:  * Copyright (c) 1982, 1986, 1988 Regents of the University of California.
                      3:  * All rights reserved.
                      4:  *
                      5:  * Redistribution and use in source and binary forms, with or without
                      6:  * modification, are permitted provided that the following conditions
                      7:  * are met:
                      8:  * 1. Redistributions of source code must retain the above copyright
                      9:  *    notice, this list of conditions and the following disclaimer.
                     10:  * 2. Redistributions in binary form must reproduce the above copyright
                     11:  *    notice, this list of conditions and the following disclaimer in the
                     12:  *    documentation and/or other materials provided with the distribution.
                     13:  * 3. All advertising materials mentioning features or use of this software
                     14:  *    must display the following acknowledgement:
                     15:  *     This product includes software developed by the University of
                     16:  *     California, Berkeley and its contributors.
                     17:  * 4. Neither the name of the University nor the names of its contributors
                     18:  *    may be used to endorse or promote products derived from this software
                     19:  *    without specific prior written permission.
                     20:  *
                     21:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     22:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     23:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     24:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     25:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     26:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     27:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     28:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     29:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     30:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     31:  * SUCH DAMAGE.
                     32:  *
1.3       cgd        33:  *     from: @(#)raw_ip.c      7.8 (Berkeley) 7/25/90
1.7     ! mycroft    34:  *     $Id: raw_ip.c,v 1.6 1993/12/06 04:59:44 hpeyerl Exp $
1.1       cgd        35:  */
                     36:
1.7     ! mycroft    37: #include <sys/param.h>
        !            38: #include <sys/malloc.h>
        !            39: #include <sys/mbuf.h>
        !            40: #include <sys/socket.h>
        !            41: #include <sys/protosw.h>
        !            42: #include <sys/socketvar.h>
        !            43: #include <sys/errno.h>
1.1       cgd        44:
1.7     ! mycroft    45: #include <net/if.h>
        !            46: #include <net/route.h>
        !            47: #include <net/raw_cb.h>
1.1       cgd        48:
1.7     ! mycroft    49: #include <netinet/in.h>
        !            50: #include <netinet/in_systm.h>
        !            51: #include <netinet/ip.h>
        !            52: #include <netinet/ip_var.h>
        !            53: #include <netinet/in_pcb.h>
1.1       cgd        54:
                     55: /*
                     56:  * Raw interface to IP protocol.
                     57:  */
                     58:
                     59: struct sockaddr_in ripdst = { sizeof(ripdst), AF_INET };
                     60: struct sockaddr_in ripsrc = { sizeof(ripsrc), AF_INET };
                     61: struct sockproto ripproto = { PF_INET };
                     62: /*
                     63:  * Setup generic address and protocol structures
                     64:  * for raw_input routine, then pass them along with
                     65:  * mbuf chain.
                     66:  */
                     67: rip_input(m)
                     68:        struct mbuf *m;
                     69: {
                     70:        register struct ip *ip = mtod(m, struct ip *);
                     71:
                     72:        ripproto.sp_protocol = ip->ip_p;
                     73:        ripdst.sin_addr = ip->ip_dst;
                     74:        ripsrc.sin_addr = ip->ip_src;
                     75:        if (raw_input(m, &ripproto, (struct sockaddr *)&ripsrc,
                     76:          (struct sockaddr *)&ripdst) == 0) {
                     77:                ipstat.ips_noproto++;
                     78:                ipstat.ips_delivered--;
                     79:        }
                     80: }
                     81:
                     82: /*
                     83:  * Generate IP header and pass packet to ip_output.
                     84:  * Tack on options user may have setup with control call.
                     85:  */
                     86: #define        satosin(sa)     ((struct sockaddr_in *)(sa))
                     87: rip_output(m, so)
                     88:        register struct mbuf *m;
                     89:        struct socket *so;
                     90: {
                     91:        register struct ip *ip;
                     92:        register struct raw_inpcb *rp = sotorawinpcb(so);
                     93:        register struct sockaddr_in *sin;
                     94:
                     95:        /*
                     96:         * If the user handed us a complete IP packet, use it.
                     97:         * Otherwise, allocate an mbuf for a header and fill it in.
                     98:         */
1.4       cgd        99:        if (rp->rinp_flags & RINPF_HDRINCL) {
1.1       cgd       100:                ip = mtod(m, struct ip *);
1.4       cgd       101:                if (ip->ip_len > m->m_pkthdr.len)
                    102:                        return EMSGSIZE;
                    103:                ip->ip_len = m->m_pkthdr.len;
                    104:        } else {
1.1       cgd       105:                M_PREPEND(m, sizeof(struct ip), M_WAIT);
                    106:                ip = mtod(m, struct ip *);
                    107:                ip->ip_tos = 0;
                    108:                ip->ip_off = 0;
                    109:                ip->ip_p = rp->rinp_rcb.rcb_proto.sp_protocol;
                    110:                ip->ip_len = m->m_pkthdr.len;
                    111:                if (sin = satosin(rp->rinp_rcb.rcb_laddr)) {
                    112:                        ip->ip_src = sin->sin_addr;
                    113:                } else
                    114:                        ip->ip_src.s_addr = 0;
                    115:                if (sin = satosin(rp->rinp_rcb.rcb_faddr))
                    116:                    ip->ip_dst = sin->sin_addr;
                    117:                ip->ip_ttl = MAXTTL;
                    118:        }
                    119:        return (ip_output(m,
                    120:           (rp->rinp_flags & RINPF_HDRINCL)? (struct mbuf *)0: rp->rinp_options,
                    121:            &rp->rinp_route,
1.6       hpeyerl   122:           (so->so_options & SO_DONTROUTE) | IP_ALLOWBROADCAST
                    123: #ifdef MULTICAST
                    124:                | IP_MULTICASTOPTS, rp->rinp_rcb.rcb_moptions
                    125: #endif
                    126:        ));
1.1       cgd       127: }
                    128:
                    129: /*
                    130:  * Raw IP socket option processing.
                    131:  */
                    132: rip_ctloutput(op, so, level, optname, m)
                    133:        int op;
                    134:        struct socket *so;
                    135:        int level, optname;
                    136:        struct mbuf **m;
                    137: {
                    138:        int error = 0;
                    139:        register struct raw_inpcb *rp = sotorawinpcb(so);
                    140:
                    141:        if (level != IPPROTO_IP)
                    142:                error = EINVAL;
                    143:        else switch (op) {
                    144:
                    145:        case PRCO_SETOPT:
                    146:                switch (optname) {
                    147:
                    148:                case IP_OPTIONS:
                    149:                        return (ip_pcbopts(&rp->rinp_options, *m));
                    150:
                    151:                case IP_HDRINCL:
                    152:                        if (m == 0 || *m == 0 || (*m)->m_len < sizeof (int)) {
                    153:                                error = EINVAL;
                    154:                                break;
                    155:                        }
                    156:                        if (*mtod(*m, int *))
                    157:                                rp->rinp_flags |= RINPF_HDRINCL;
                    158:                        else
                    159:                                rp->rinp_flags &= ~RINPF_HDRINCL;
                    160:                        break;
1.6       hpeyerl   161: #ifdef MULTICAST
                    162:                case IP_MULTICAST_IF:
                    163:                case IP_MULTICAST_TTL:
                    164:                case IP_MULTICAST_LOOP:
                    165:                case IP_ADD_MEMBERSHIP:
                    166:                case IP_DROP_MEMBERSHIP:
                    167:                        error = ip_setmoptions(optname,
                    168:                                               &rp->rinp_rcb.rcb_moptions, *m);
                    169:                        break;
                    170:                default:
                    171: #ifdef MROUTING
                    172:                        error = ip_mrouter_cmd(optname, so, *m);
                    173: #else
                    174:                        error = EINVAL;
                    175: #endif
                    176:                        break;
                    177: #else
1.1       cgd       178:                default:
                    179:                        error = EINVAL;
                    180:                        break;
1.6       hpeyerl   181: #endif
1.1       cgd       182:                }
                    183:                break;
                    184:
                    185:        case PRCO_GETOPT:
                    186:                *m = m_get(M_WAIT, MT_SOOPTS);
                    187:                switch (optname) {
                    188:
                    189:                case IP_OPTIONS:
                    190:                        if (rp->rinp_options) {
                    191:                                (*m)->m_len = rp->rinp_options->m_len;
                    192:                                bcopy(mtod(rp->rinp_options, caddr_t),
                    193:                                    mtod(*m, caddr_t), (unsigned)(*m)->m_len);
                    194:                        } else
                    195:                                (*m)->m_len = 0;
                    196:                        break;
                    197:
                    198:                case IP_HDRINCL:
                    199:                        (*m)->m_len = sizeof (int);
                    200:                        *mtod(*m, int *) = rp->rinp_flags & RINPF_HDRINCL;
                    201:                        break;
1.6       hpeyerl   202: #ifdef MULTICAST
                    203:                case IP_MULTICAST_IF:
                    204:                case IP_MULTICAST_TTL:
                    205:                case IP_MULTICAST_LOOP:
                    206:                case IP_ADD_MEMBERSHIP:
                    207:                case IP_DROP_MEMBERSHIP:
                    208:                        error = ip_getmoptions(optname,
                    209:                                                rp->rinp_rcb.rcb_moptions, m);
                    210:                       break;
                    211: #endif
1.1       cgd       212:                default:
                    213:                        error = EINVAL;
                    214:                        m_freem(*m);
                    215:                        *m = 0;
                    216:                        break;
                    217:                }
                    218:                break;
                    219:        }
                    220:        if (op == PRCO_SETOPT && *m)
                    221:                (void)m_free(*m);
                    222:        return (error);
                    223: }
                    224:
                    225: /*ARGSUSED*/
1.2       cgd       226: rip_usrreq(so, req, m, nam, control)
1.1       cgd       227:        register struct socket *so;
                    228:        int req;
1.2       cgd       229:        struct mbuf *m, *nam, *control;
1.1       cgd       230: {
                    231:        register int error = 0;
                    232:        register struct raw_inpcb *rp = sotorawinpcb(so);
1.6       hpeyerl   233: #if defined(MULTICAST) && defined(MROUTING)
                    234:        extern struct socket *ip_mrouter;
                    235: #endif
1.1       cgd       236:        switch (req) {
                    237:
                    238:        case PRU_ATTACH:
                    239:                if (rp)
                    240:                        panic("rip_attach");
                    241:                MALLOC(rp, struct raw_inpcb *, sizeof *rp, M_PCB, M_WAITOK);
                    242:                if (rp == 0)
                    243:                        return (ENOBUFS);
                    244:                bzero((caddr_t)rp, sizeof *rp);
                    245:                so->so_pcb = (caddr_t)rp;
                    246:                break;
                    247:
                    248:        case PRU_DETACH:
                    249:                if (rp == 0)
                    250:                        panic("rip_detach");
1.6       hpeyerl   251: #if defined(MULTICAST) && defined(MROUTING)
                    252:                if (so == ip_mrouter)
                    253:                        ip_mrouter_done();
                    254: #endif
1.1       cgd       255:                if (rp->rinp_options)
                    256:                        m_freem(rp->rinp_options);
1.6       hpeyerl   257: #ifdef MULTICAST
                    258:                if (rp->rinp_rcb.rcb_moptions)
                    259:                        ip_freemoptions(rp->rinp_rcb.rcb_moptions);
                    260: #endif
1.1       cgd       261:                if (rp->rinp_route.ro_rt)
                    262:                        RTFREE(rp->rinp_route.ro_rt);
                    263:                if (rp->rinp_rcb.rcb_laddr)
                    264:                        rp->rinp_rcb.rcb_laddr = 0;
                    265:                break;
                    266:
                    267:        case PRU_BIND:
                    268:            {
                    269:                struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *);
                    270:
                    271:                if (nam->m_len != sizeof(*addr))
                    272:                        return (EINVAL);
                    273:                if ((ifnet == 0) ||
                    274:                    ((addr->sin_family != AF_INET) &&
                    275:                     (addr->sin_family != AF_IMPLINK)) ||
                    276:                    (addr->sin_addr.s_addr &&
                    277:                     ifa_ifwithaddr((struct sockaddr *)addr) == 0))
                    278:                        return (EADDRNOTAVAIL);
                    279:                rp->rinp_rcb.rcb_laddr = (struct sockaddr *)&rp->rinp_laddr;
                    280:                rp->rinp_laddr = *addr;
                    281:                return (0);
                    282:            }
                    283:        case PRU_CONNECT:
                    284:            {
                    285:                struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *);
                    286:
                    287:                if (nam->m_len != sizeof(*addr))
                    288:                        return (EINVAL);
                    289:                if (ifnet == 0)
                    290:                        return (EADDRNOTAVAIL);
                    291:                if ((addr->sin_family != AF_INET) &&
                    292:                     (addr->sin_family != AF_IMPLINK))
                    293:                        return (EAFNOSUPPORT);
                    294:                rp->rinp_rcb.rcb_faddr = (struct sockaddr *)&rp->rinp_faddr;
                    295:                rp->rinp_faddr = *addr;
                    296:                soisconnected(so);
                    297:                return (0);
                    298:            }
                    299:        }
                    300:        error =  raw_usrreq(so, req, m, nam, control);
                    301:
                    302:        if (error && (req == PRU_ATTACH) && so->so_pcb)
                    303:                free(so->so_pcb, M_PCB);
                    304:        return (error);
                    305: }

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