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Annotation of src/sys/netinet/raw_ip.c, Revision 1.12

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
1.12    ! mycroft    34:  *     $Id: raw_ip.c,v 1.11 1994/02/02 05:59:08 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>
1.9       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;
1.10      mycroft    97:        struct mbuf *opts;
1.1       cgd        98:
                     99:        /*
                    100:         * If the user handed us a complete IP packet, use it.
                    101:         * Otherwise, allocate an mbuf for a header and fill it in.
                    102:         */
1.4       cgd       103:        if (rp->rinp_flags & RINPF_HDRINCL) {
1.1       cgd       104:                ip = mtod(m, struct ip *);
1.4       cgd       105:                if (ip->ip_len > m->m_pkthdr.len)
                    106:                        return EMSGSIZE;
                    107:                ip->ip_len = m->m_pkthdr.len;
1.10      mycroft   108:                opts = NULL;
1.4       cgd       109:        } else {
1.1       cgd       110:                M_PREPEND(m, sizeof(struct ip), M_WAIT);
                    111:                ip = mtod(m, struct ip *);
                    112:                ip->ip_tos = 0;
                    113:                ip->ip_off = 0;
                    114:                ip->ip_p = rp->rinp_rcb.rcb_proto.sp_protocol;
                    115:                ip->ip_len = m->m_pkthdr.len;
                    116:                if (sin = satosin(rp->rinp_rcb.rcb_laddr)) {
                    117:                        ip->ip_src = sin->sin_addr;
                    118:                } else
                    119:                        ip->ip_src.s_addr = 0;
                    120:                if (sin = satosin(rp->rinp_rcb.rcb_faddr))
                    121:                    ip->ip_dst = sin->sin_addr;
                    122:                ip->ip_ttl = MAXTTL;
1.10      mycroft   123:                opts = rp->rinp_options;
1.1       cgd       124:        }
1.10      mycroft   125:        return (ip_output(m, opts, &rp->rinp_route,
1.12    ! mycroft   126:            (so->so_options & SO_DONTROUTE) | IP_ALLOWBROADCAST,
        !           127:            rp->rinp_rcb.rcb_moptions));
1.1       cgd       128: }
                    129:
                    130: /*
                    131:  * Raw IP socket option processing.
                    132:  */
1.9       mycroft   133: int
1.1       cgd       134: rip_ctloutput(op, so, level, optname, m)
                    135:        int op;
                    136:        struct socket *so;
                    137:        int level, optname;
                    138:        struct mbuf **m;
                    139: {
                    140:        int error = 0;
                    141:        register struct raw_inpcb *rp = sotorawinpcb(so);
                    142:
                    143:        if (level != IPPROTO_IP)
                    144:                error = EINVAL;
                    145:        else switch (op) {
                    146:
                    147:        case PRCO_SETOPT:
                    148:                switch (optname) {
                    149:
                    150:                case IP_OPTIONS:
                    151:                        return (ip_pcbopts(&rp->rinp_options, *m));
                    152:
                    153:                case IP_HDRINCL:
                    154:                        if (m == 0 || *m == 0 || (*m)->m_len < sizeof (int)) {
                    155:                                error = EINVAL;
                    156:                                break;
                    157:                        }
                    158:                        if (*mtod(*m, int *))
                    159:                                rp->rinp_flags |= RINPF_HDRINCL;
                    160:                        else
                    161:                                rp->rinp_flags &= ~RINPF_HDRINCL;
                    162:                        break;
1.6       hpeyerl   163:                case IP_MULTICAST_IF:
                    164:                case IP_MULTICAST_TTL:
                    165:                case IP_MULTICAST_LOOP:
                    166:                case IP_ADD_MEMBERSHIP:
                    167:                case IP_DROP_MEMBERSHIP:
                    168:                        error = ip_setmoptions(optname,
1.12    ! mycroft   169:                            &rp->rinp_rcb.rcb_moptions, *m);
1.6       hpeyerl   170:                        break;
                    171:                default:
                    172: #ifdef MROUTING
                    173:                        error = ip_mrouter_cmd(optname, so, *m);
                    174: #else
                    175:                        error = EINVAL;
                    176: #endif
                    177:                        break;
1.1       cgd       178:                }
                    179:                break;
                    180:
                    181:        case PRCO_GETOPT:
                    182:                *m = m_get(M_WAIT, MT_SOOPTS);
                    183:                switch (optname) {
                    184:
                    185:                case IP_OPTIONS:
                    186:                        if (rp->rinp_options) {
                    187:                                (*m)->m_len = rp->rinp_options->m_len;
                    188:                                bcopy(mtod(rp->rinp_options, caddr_t),
                    189:                                    mtod(*m, caddr_t), (unsigned)(*m)->m_len);
                    190:                        } else
                    191:                                (*m)->m_len = 0;
                    192:                        break;
                    193:
                    194:                case IP_HDRINCL:
                    195:                        (*m)->m_len = sizeof (int);
                    196:                        *mtod(*m, int *) = rp->rinp_flags & RINPF_HDRINCL;
                    197:                        break;
1.6       hpeyerl   198:                case IP_MULTICAST_IF:
                    199:                case IP_MULTICAST_TTL:
                    200:                case IP_MULTICAST_LOOP:
                    201:                case IP_ADD_MEMBERSHIP:
                    202:                case IP_DROP_MEMBERSHIP:
1.8       mycroft   203:                        error = ip_getmoptions(optname,
                    204:                            rp->rinp_rcb.rcb_moptions, m);
                    205:                        break;
1.1       cgd       206:                default:
                    207:                        error = EINVAL;
                    208:                        m_freem(*m);
                    209:                        *m = 0;
                    210:                        break;
                    211:                }
                    212:                break;
                    213:        }
                    214:        if (op == PRCO_SETOPT && *m)
                    215:                (void)m_free(*m);
                    216:        return (error);
                    217: }
                    218:
                    219: /*ARGSUSED*/
1.9       mycroft   220: int
1.2       cgd       221: rip_usrreq(so, req, m, nam, control)
1.1       cgd       222:        register struct socket *so;
                    223:        int req;
1.2       cgd       224:        struct mbuf *m, *nam, *control;
1.1       cgd       225: {
                    226:        register int error = 0;
                    227:        register struct raw_inpcb *rp = sotorawinpcb(so);
1.11      hpeyerl   228: #if defined(MROUTING)
1.6       hpeyerl   229:        extern struct socket *ip_mrouter;
                    230: #endif
1.1       cgd       231:        switch (req) {
                    232:
                    233:        case PRU_ATTACH:
                    234:                if (rp)
                    235:                        panic("rip_attach");
                    236:                MALLOC(rp, struct raw_inpcb *, sizeof *rp, M_PCB, M_WAITOK);
                    237:                if (rp == 0)
                    238:                        return (ENOBUFS);
                    239:                bzero((caddr_t)rp, sizeof *rp);
                    240:                so->so_pcb = (caddr_t)rp;
                    241:                break;
                    242:
                    243:        case PRU_DETACH:
                    244:                if (rp == 0)
                    245:                        panic("rip_detach");
1.11      hpeyerl   246: #if defined(MROUTING)
1.6       hpeyerl   247:                if (so == ip_mrouter)
                    248:                        ip_mrouter_done();
                    249: #endif
1.1       cgd       250:                if (rp->rinp_options)
                    251:                        m_freem(rp->rinp_options);
1.6       hpeyerl   252:                if (rp->rinp_rcb.rcb_moptions)
                    253:                        ip_freemoptions(rp->rinp_rcb.rcb_moptions);
1.1       cgd       254:                if (rp->rinp_route.ro_rt)
                    255:                        RTFREE(rp->rinp_route.ro_rt);
                    256:                if (rp->rinp_rcb.rcb_laddr)
                    257:                        rp->rinp_rcb.rcb_laddr = 0;
                    258:                break;
                    259:
                    260:        case PRU_BIND:
                    261:            {
                    262:                struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *);
                    263:
                    264:                if (nam->m_len != sizeof(*addr))
                    265:                        return (EINVAL);
                    266:                if ((ifnet == 0) ||
                    267:                    ((addr->sin_family != AF_INET) &&
                    268:                     (addr->sin_family != AF_IMPLINK)) ||
                    269:                    (addr->sin_addr.s_addr &&
                    270:                     ifa_ifwithaddr((struct sockaddr *)addr) == 0))
                    271:                        return (EADDRNOTAVAIL);
                    272:                rp->rinp_rcb.rcb_laddr = (struct sockaddr *)&rp->rinp_laddr;
                    273:                rp->rinp_laddr = *addr;
                    274:                return (0);
                    275:            }
                    276:        case PRU_CONNECT:
                    277:            {
                    278:                struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *);
                    279:
                    280:                if (nam->m_len != sizeof(*addr))
                    281:                        return (EINVAL);
                    282:                if (ifnet == 0)
                    283:                        return (EADDRNOTAVAIL);
                    284:                if ((addr->sin_family != AF_INET) &&
                    285:                     (addr->sin_family != AF_IMPLINK))
                    286:                        return (EAFNOSUPPORT);
                    287:                rp->rinp_rcb.rcb_faddr = (struct sockaddr *)&rp->rinp_faddr;
                    288:                rp->rinp_faddr = *addr;
                    289:                soisconnected(so);
                    290:                return (0);
                    291:            }
                    292:        }
                    293:        error =  raw_usrreq(so, req, m, nam, control);
                    294:
                    295:        if (error && (req == PRU_ATTACH) && so->so_pcb)
                    296:                free(so->so_pcb, M_PCB);
                    297:        return (error);
                    298: }

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