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Annotation of src/sys/netinet/raw_ip.c, Revision 1.9

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
1.9     ! mycroft    34:  *     $Id: raw_ip.c,v 1.8 1994/01/08 21:21:55 mycroft 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>
1.9     ! mycroft    54: #include <netinet/ip_mroute.h>
1.1       cgd        55:
                     56: /*
                     57:  * Raw interface to IP protocol.
                     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 };
1.9     ! mycroft    62:
1.1       cgd        63: /*
                     64:  * Setup generic address and protocol structures
                     65:  * for raw_input routine, then pass them along with
                     66:  * mbuf chain.
                     67:  */
1.9     ! mycroft    68: void
1.1       cgd        69: rip_input(m)
                     70:        struct mbuf *m;
                     71: {
                     72:        register struct ip *ip = mtod(m, struct ip *);
                     73:
                     74:        ripproto.sp_protocol = ip->ip_p;
                     75:        ripdst.sin_addr = ip->ip_dst;
                     76:        ripsrc.sin_addr = ip->ip_src;
                     77:        if (raw_input(m, &ripproto, (struct sockaddr *)&ripsrc,
                     78:          (struct sockaddr *)&ripdst) == 0) {
                     79:                ipstat.ips_noproto++;
                     80:                ipstat.ips_delivered--;
                     81:        }
                     82: }
                     83:
                     84: /*
                     85:  * Generate IP header and pass packet to ip_output.
                     86:  * Tack on options user may have setup with control call.
                     87:  */
                     88: #define        satosin(sa)     ((struct sockaddr_in *)(sa))
1.9     ! mycroft    89: int
1.1       cgd        90: rip_output(m, so)
                     91:        register struct mbuf *m;
                     92:        struct socket *so;
                     93: {
                     94:        register struct ip *ip;
                     95:        register struct raw_inpcb *rp = sotorawinpcb(so);
                     96:        register struct sockaddr_in *sin;
                     97:
                     98:        /*
                     99:         * If the user handed us a complete IP packet, use it.
                    100:         * Otherwise, allocate an mbuf for a header and fill it in.
                    101:         */
1.4       cgd       102:        if (rp->rinp_flags & RINPF_HDRINCL) {
1.1       cgd       103:                ip = mtod(m, struct ip *);
1.4       cgd       104:                if (ip->ip_len > m->m_pkthdr.len)
                    105:                        return EMSGSIZE;
                    106:                ip->ip_len = m->m_pkthdr.len;
                    107:        } else {
1.1       cgd       108:                M_PREPEND(m, sizeof(struct ip), M_WAIT);
                    109:                ip = mtod(m, struct ip *);
                    110:                ip->ip_tos = 0;
                    111:                ip->ip_off = 0;
                    112:                ip->ip_p = rp->rinp_rcb.rcb_proto.sp_protocol;
                    113:                ip->ip_len = m->m_pkthdr.len;
                    114:                if (sin = satosin(rp->rinp_rcb.rcb_laddr)) {
                    115:                        ip->ip_src = sin->sin_addr;
                    116:                } else
                    117:                        ip->ip_src.s_addr = 0;
                    118:                if (sin = satosin(rp->rinp_rcb.rcb_faddr))
                    119:                    ip->ip_dst = sin->sin_addr;
                    120:                ip->ip_ttl = MAXTTL;
                    121:        }
                    122:        return (ip_output(m,
                    123:           (rp->rinp_flags & RINPF_HDRINCL)? (struct mbuf *)0: rp->rinp_options,
1.8       mycroft   124:            &rp->rinp_route,
1.6       hpeyerl   125:           (so->so_options & SO_DONTROUTE) | IP_ALLOWBROADCAST
                    126: #ifdef MULTICAST
                    127:                | IP_MULTICASTOPTS, rp->rinp_rcb.rcb_moptions
                    128: #endif
                    129:        ));
1.1       cgd       130: }
                    131:
                    132: /*
                    133:  * Raw IP socket option processing.
                    134:  */
1.9     ! mycroft   135: int
1.1       cgd       136: rip_ctloutput(op, so, level, optname, m)
                    137:        int op;
                    138:        struct socket *so;
                    139:        int level, optname;
                    140:        struct mbuf **m;
                    141: {
                    142:        int error = 0;
                    143:        register struct raw_inpcb *rp = sotorawinpcb(so);
                    144:
                    145:        if (level != IPPROTO_IP)
                    146:                error = EINVAL;
                    147:        else switch (op) {
                    148:
                    149:        case PRCO_SETOPT:
                    150:                switch (optname) {
                    151:
                    152:                case IP_OPTIONS:
                    153:                        return (ip_pcbopts(&rp->rinp_options, *m));
                    154:
                    155:                case IP_HDRINCL:
                    156:                        if (m == 0 || *m == 0 || (*m)->m_len < sizeof (int)) {
                    157:                                error = EINVAL;
                    158:                                break;
                    159:                        }
                    160:                        if (*mtod(*m, int *))
                    161:                                rp->rinp_flags |= RINPF_HDRINCL;
                    162:                        else
                    163:                                rp->rinp_flags &= ~RINPF_HDRINCL;
                    164:                        break;
1.6       hpeyerl   165: #ifdef MULTICAST
                    166:                case IP_MULTICAST_IF:
                    167:                case IP_MULTICAST_TTL:
                    168:                case IP_MULTICAST_LOOP:
                    169:                case IP_ADD_MEMBERSHIP:
                    170:                case IP_DROP_MEMBERSHIP:
                    171:                        error = ip_setmoptions(optname,
                    172:                                               &rp->rinp_rcb.rcb_moptions, *m);
                    173:                        break;
                    174:                default:
                    175: #ifdef MROUTING
                    176:                        error = ip_mrouter_cmd(optname, so, *m);
                    177: #else
                    178:                        error = EINVAL;
                    179: #endif
                    180:                        break;
                    181: #else
1.1       cgd       182:                default:
                    183:                        error = EINVAL;
                    184:                        break;
1.6       hpeyerl   185: #endif
1.1       cgd       186:                }
                    187:                break;
                    188:
                    189:        case PRCO_GETOPT:
                    190:                *m = m_get(M_WAIT, MT_SOOPTS);
                    191:                switch (optname) {
                    192:
                    193:                case IP_OPTIONS:
                    194:                        if (rp->rinp_options) {
                    195:                                (*m)->m_len = rp->rinp_options->m_len;
                    196:                                bcopy(mtod(rp->rinp_options, caddr_t),
                    197:                                    mtod(*m, caddr_t), (unsigned)(*m)->m_len);
                    198:                        } else
                    199:                                (*m)->m_len = 0;
                    200:                        break;
                    201:
                    202:                case IP_HDRINCL:
                    203:                        (*m)->m_len = sizeof (int);
                    204:                        *mtod(*m, int *) = rp->rinp_flags & RINPF_HDRINCL;
                    205:                        break;
1.6       hpeyerl   206: #ifdef MULTICAST
                    207:                case IP_MULTICAST_IF:
                    208:                case IP_MULTICAST_TTL:
                    209:                case IP_MULTICAST_LOOP:
                    210:                case IP_ADD_MEMBERSHIP:
                    211:                case IP_DROP_MEMBERSHIP:
1.8       mycroft   212:                        error = ip_getmoptions(optname,
                    213:                            rp->rinp_rcb.rcb_moptions, m);
                    214:                        break;
1.6       hpeyerl   215: #endif
1.1       cgd       216:                default:
                    217:                        error = EINVAL;
                    218:                        m_freem(*m);
                    219:                        *m = 0;
                    220:                        break;
                    221:                }
                    222:                break;
                    223:        }
                    224:        if (op == PRCO_SETOPT && *m)
                    225:                (void)m_free(*m);
                    226:        return (error);
                    227: }
                    228:
                    229: /*ARGSUSED*/
1.9     ! mycroft   230: int
1.2       cgd       231: rip_usrreq(so, req, m, nam, control)
1.1       cgd       232:        register struct socket *so;
                    233:        int req;
1.2       cgd       234:        struct mbuf *m, *nam, *control;
1.1       cgd       235: {
                    236:        register int error = 0;
                    237:        register struct raw_inpcb *rp = sotorawinpcb(so);
1.6       hpeyerl   238: #if defined(MULTICAST) && defined(MROUTING)
                    239:        extern struct socket *ip_mrouter;
                    240: #endif
1.1       cgd       241:        switch (req) {
                    242:
                    243:        case PRU_ATTACH:
                    244:                if (rp)
                    245:                        panic("rip_attach");
                    246:                MALLOC(rp, struct raw_inpcb *, sizeof *rp, M_PCB, M_WAITOK);
                    247:                if (rp == 0)
                    248:                        return (ENOBUFS);
                    249:                bzero((caddr_t)rp, sizeof *rp);
                    250:                so->so_pcb = (caddr_t)rp;
                    251:                break;
                    252:
                    253:        case PRU_DETACH:
                    254:                if (rp == 0)
                    255:                        panic("rip_detach");
1.6       hpeyerl   256: #if defined(MULTICAST) && defined(MROUTING)
                    257:                if (so == ip_mrouter)
                    258:                        ip_mrouter_done();
                    259: #endif
1.1       cgd       260:                if (rp->rinp_options)
                    261:                        m_freem(rp->rinp_options);
1.6       hpeyerl   262: #ifdef MULTICAST
                    263:                if (rp->rinp_rcb.rcb_moptions)
                    264:                        ip_freemoptions(rp->rinp_rcb.rcb_moptions);
                    265: #endif
1.1       cgd       266:                if (rp->rinp_route.ro_rt)
                    267:                        RTFREE(rp->rinp_route.ro_rt);
                    268:                if (rp->rinp_rcb.rcb_laddr)
                    269:                        rp->rinp_rcb.rcb_laddr = 0;
                    270:                break;
                    271:
                    272:        case PRU_BIND:
                    273:            {
                    274:                struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *);
                    275:
                    276:                if (nam->m_len != sizeof(*addr))
                    277:                        return (EINVAL);
                    278:                if ((ifnet == 0) ||
                    279:                    ((addr->sin_family != AF_INET) &&
                    280:                     (addr->sin_family != AF_IMPLINK)) ||
                    281:                    (addr->sin_addr.s_addr &&
                    282:                     ifa_ifwithaddr((struct sockaddr *)addr) == 0))
                    283:                        return (EADDRNOTAVAIL);
                    284:                rp->rinp_rcb.rcb_laddr = (struct sockaddr *)&rp->rinp_laddr;
                    285:                rp->rinp_laddr = *addr;
                    286:                return (0);
                    287:            }
                    288:        case PRU_CONNECT:
                    289:            {
                    290:                struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *);
                    291:
                    292:                if (nam->m_len != sizeof(*addr))
                    293:                        return (EINVAL);
                    294:                if (ifnet == 0)
                    295:                        return (EADDRNOTAVAIL);
                    296:                if ((addr->sin_family != AF_INET) &&
                    297:                     (addr->sin_family != AF_IMPLINK))
                    298:                        return (EAFNOSUPPORT);
                    299:                rp->rinp_rcb.rcb_faddr = (struct sockaddr *)&rp->rinp_faddr;
                    300:                rp->rinp_faddr = *addr;
                    301:                soisconnected(so);
                    302:                return (0);
                    303:            }
                    304:        }
                    305:        error =  raw_usrreq(so, req, m, nam, control);
                    306:
                    307:        if (error && (req == PRU_ATTACH) && so->so_pcb)
                    308:                free(so->so_pcb, M_PCB);
                    309:        return (error);
                    310: }

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