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Annotation of src/sys/netinet/raw_ip.c, Revision 1.14

1.14    ! cgd         1: /*     $NetBSD$        */
        !             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>
1.1       cgd        46:
1.7       mycroft    47: #include <net/if.h>
                     48: #include <net/route.h>
1.1       cgd        49:
1.7       mycroft    50: #include <netinet/in.h>
                     51: #include <netinet/in_systm.h>
                     52: #include <netinet/ip.h>
                     53: #include <netinet/ip_var.h>
1.13      mycroft    54: #include <netinet/ip_mroute.h>
1.7       mycroft    55: #include <netinet/in_pcb.h>
1.13      mycroft    56:
                     57: struct inpcb rawinpcb;
                     58:
                     59: /*
                     60:  * Nominal space allocated to a raw ip socket.
                     61:  */
                     62: #define        RIPSNDQ         8192
                     63: #define        RIPRCVQ         8192
1.1       cgd        64:
                     65: /*
                     66:  * Raw interface to IP protocol.
                     67:  */
1.13      mycroft    68:
                     69: /*
                     70:  * Initialize raw connection block q.
                     71:  */
                     72: void
                     73: rip_init()
                     74: {
                     75:
                     76:        rawinpcb.inp_next = rawinpcb.inp_prev = &rawinpcb;
                     77: }
                     78:
1.1       cgd        79: struct sockaddr_in ripsrc = { sizeof(ripsrc), AF_INET };
                     80: /*
                     81:  * Setup generic address and protocol structures
                     82:  * for raw_input routine, then pass them along with
                     83:  * mbuf chain.
                     84:  */
1.9       mycroft    85: void
1.1       cgd        86: rip_input(m)
                     87:        struct mbuf *m;
                     88: {
                     89:        register struct ip *ip = mtod(m, struct ip *);
1.13      mycroft    90:        register struct inpcb *inp;
                     91:        struct socket *last = 0;
1.1       cgd        92:
                     93:        ripsrc.sin_addr = ip->ip_src;
1.13      mycroft    94:        for (inp = rawinpcb.inp_next; inp != &rawinpcb; inp = inp->inp_next) {
                     95:                if (inp->inp_ip.ip_p && inp->inp_ip.ip_p != ip->ip_p)
                     96:                        continue;
                     97:                if (inp->inp_laddr.s_addr &&
                     98:                    inp->inp_laddr.s_addr == ip->ip_dst.s_addr)
                     99:                        continue;
                    100:                if (inp->inp_faddr.s_addr &&
                    101:                    inp->inp_faddr.s_addr == ip->ip_src.s_addr)
                    102:                        continue;
                    103:                if (last) {
                    104:                        struct mbuf *n;
                    105:                        if (n = m_copy(m, 0, (int)M_COPYALL)) {
                    106:                                if (sbappendaddr(&last->so_rcv,
                    107:                                    (struct sockaddr *)&ripsrc,
                    108:                                    n, (struct mbuf *)0) == 0)
                    109:                                        /* should notify about lost packet */
                    110:                                        m_freem(n);
                    111:                                else
                    112:                                        sorwakeup(last);
                    113:                        }
                    114:                }
                    115:                last = inp->inp_socket;
                    116:        }
                    117:        if (last) {
                    118:                if (sbappendaddr(&last->so_rcv, (struct sockaddr *)&ripsrc,
                    119:                    m, (struct mbuf *)0) == 0)
                    120:                        m_freem(m);
                    121:                else
                    122:                        sorwakeup(last);
                    123:        } else {
                    124:                m_freem(m);
1.1       cgd       125:                ipstat.ips_noproto++;
                    126:                ipstat.ips_delivered--;
                    127:        }
                    128: }
                    129:
                    130: /*
                    131:  * Generate IP header and pass packet to ip_output.
                    132:  * Tack on options user may have setup with control call.
                    133:  */
1.9       mycroft   134: int
1.13      mycroft   135: rip_output(m, so, dst)
1.1       cgd       136:        register struct mbuf *m;
                    137:        struct socket *so;
1.13      mycroft   138:        u_long dst;
1.1       cgd       139: {
                    140:        register struct ip *ip;
1.13      mycroft   141:        register struct inpcb *inp = sotoinpcb(so);
1.10      mycroft   142:        struct mbuf *opts;
1.13      mycroft   143:        int flags = (so->so_options & SO_DONTROUTE) | IP_ALLOWBROADCAST;
1.1       cgd       144:
                    145:        /*
                    146:         * If the user handed us a complete IP packet, use it.
                    147:         * Otherwise, allocate an mbuf for a header and fill it in.
                    148:         */
1.13      mycroft   149:        if ((inp->inp_flags & INP_HDRINCL) == 0) {
1.1       cgd       150:                M_PREPEND(m, sizeof(struct ip), M_WAIT);
                    151:                ip = mtod(m, struct ip *);
                    152:                ip->ip_tos = 0;
                    153:                ip->ip_off = 0;
1.13      mycroft   154:                ip->ip_p = inp->inp_ip.ip_p;
1.1       cgd       155:                ip->ip_len = m->m_pkthdr.len;
1.13      mycroft   156:                ip->ip_src = inp->inp_laddr;
                    157:                ip->ip_dst.s_addr = dst;
1.1       cgd       158:                ip->ip_ttl = MAXTTL;
1.13      mycroft   159:                opts = inp->inp_options;
                    160:        } else {
                    161:                ip = mtod(m, struct ip *);
                    162:                if (ip->ip_id == 0)
                    163:                        ip->ip_id = htons(ip_id++);
                    164:                opts = NULL;
                    165:                /* XXX prevent ip_output from overwriting header fields */
                    166:                flags |= IP_RAWOUTPUT;
                    167:                ipstat.ips_rawout++;
1.1       cgd       168:        }
1.13      mycroft   169:        return (ip_output(m, opts, &inp->inp_route, flags, inp->inp_moptions));
1.1       cgd       170: }
                    171:
                    172: /*
                    173:  * Raw IP socket option processing.
                    174:  */
1.9       mycroft   175: int
1.1       cgd       176: rip_ctloutput(op, so, level, optname, m)
                    177:        int op;
                    178:        struct socket *so;
                    179:        int level, optname;
                    180:        struct mbuf **m;
                    181: {
1.13      mycroft   182:        register struct inpcb *inp = sotoinpcb(so);
                    183:        register int error;
1.1       cgd       184:
                    185:        if (level != IPPROTO_IP)
1.13      mycroft   186:                return (EINVAL);
1.1       cgd       187:
1.13      mycroft   188:        switch (optname) {
1.1       cgd       189:
1.13      mycroft   190:        case IP_HDRINCL:
                    191:                if (op == PRCO_SETOPT || op == PRCO_GETOPT) {
                    192:                        if (m == 0 || *m == 0 || (*m)->m_len < sizeof (int))
                    193:                                return (EINVAL);
                    194:                        if (op == PRCO_SETOPT) {
                    195:                                if (*mtod(*m, int *))
                    196:                                        inp->inp_flags |= INP_HDRINCL;
                    197:                                else
                    198:                                        inp->inp_flags &= ~INP_HDRINCL;
                    199:                                (void)m_free(*m);
                    200:                        } else {
                    201:                                (*m)->m_len = sizeof (int);
                    202:                                *mtod(*m, int *) = inp->inp_flags & INP_HDRINCL;
                    203:                        }
                    204:                        return (0);
                    205:                }
                    206:                break;
1.1       cgd       207:
1.13      mycroft   208:        case DVMRP_INIT:
                    209:        case DVMRP_DONE:
                    210:        case DVMRP_ADD_VIF:
                    211:        case DVMRP_DEL_VIF:
                    212:        case DVMRP_ADD_LGRP:
                    213:        case DVMRP_DEL_LGRP:
                    214:        case DVMRP_ADD_MRT:
                    215:        case DVMRP_DEL_MRT:
1.6       hpeyerl   216: #ifdef MROUTING
1.13      mycroft   217:                if (op == PRCO_SETOPT) {
1.6       hpeyerl   218:                        error = ip_mrouter_cmd(optname, so, *m);
1.13      mycroft   219:                        if (*m)
                    220:                                (void)m_free(*m);
                    221:                } else
                    222:                        error = EINVAL;
                    223:                return (error);
1.6       hpeyerl   224: #else
1.13      mycroft   225:                if (op == PRCO_SETOPT && *m)
                    226:                        (void)m_free(*m);
                    227:                return (EOPNOTSUPP);
1.6       hpeyerl   228: #endif
1.1       cgd       229:        }
1.13      mycroft   230:        return (ip_ctloutput(op, so, level, optname, m));
1.1       cgd       231: }
                    232:
1.13      mycroft   233: u_long rip_sendspace = RIPSNDQ;
                    234: u_long rip_recvspace = RIPRCVQ;
                    235:
1.1       cgd       236: /*ARGSUSED*/
1.9       mycroft   237: int
1.2       cgd       238: rip_usrreq(so, req, m, nam, control)
1.1       cgd       239:        register struct socket *so;
                    240:        int req;
1.2       cgd       241:        struct mbuf *m, *nam, *control;
1.1       cgd       242: {
                    243:        register int error = 0;
1.13      mycroft   244:        register struct inpcb *inp = sotoinpcb(so);
                    245: #ifdef MROUTING
1.6       hpeyerl   246:        extern struct socket *ip_mrouter;
                    247: #endif
1.1       cgd       248:        switch (req) {
                    249:
                    250:        case PRU_ATTACH:
1.13      mycroft   251:                if (inp)
1.1       cgd       252:                        panic("rip_attach");
1.13      mycroft   253:                if ((so->so_state & SS_PRIV) == 0) {
                    254:                        error = EACCES;
                    255:                        break;
                    256:                }
                    257:                if ((error = soreserve(so, rip_sendspace, rip_recvspace)) ||
                    258:                    (error = in_pcballoc(so, &rawinpcb)))
                    259:                        break;
                    260:                inp = (struct inpcb *)so->so_pcb;
                    261:                inp->inp_ip.ip_p = (int)nam;
1.1       cgd       262:                break;
                    263:
1.13      mycroft   264:        case PRU_DISCONNECT:
                    265:                if ((so->so_state & SS_ISCONNECTED) == 0) {
                    266:                        error = ENOTCONN;
                    267:                        break;
                    268:                }
                    269:                /* FALLTHROUGH */
                    270:        case PRU_ABORT:
                    271:                soisdisconnected(so);
                    272:                /* FALLTHROUGH */
1.1       cgd       273:        case PRU_DETACH:
1.13      mycroft   274:                if (inp == 0)
1.1       cgd       275:                        panic("rip_detach");
1.13      mycroft   276: #ifdef MROUTING
1.6       hpeyerl   277:                if (so == ip_mrouter)
                    278:                        ip_mrouter_done();
                    279: #endif
1.13      mycroft   280:                in_pcbdetach(inp);
1.1       cgd       281:                break;
                    282:
                    283:        case PRU_BIND:
                    284:            {
                    285:                struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *);
                    286:
1.13      mycroft   287:                if (nam->m_len != sizeof(*addr)) {
                    288:                        error = EINVAL;
                    289:                        break;
                    290:                }
1.1       cgd       291:                if ((ifnet == 0) ||
                    292:                    ((addr->sin_family != AF_INET) &&
                    293:                     (addr->sin_family != AF_IMPLINK)) ||
                    294:                    (addr->sin_addr.s_addr &&
1.13      mycroft   295:                     ifa_ifwithaddr((struct sockaddr *)addr) == 0)) {
                    296:                        error = EADDRNOTAVAIL;
                    297:                        break;
                    298:                }
                    299:                inp->inp_laddr = addr->sin_addr;
                    300:                break;
1.1       cgd       301:            }
                    302:        case PRU_CONNECT:
                    303:            {
                    304:                struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *);
                    305:
1.13      mycroft   306:                if (nam->m_len != sizeof(*addr)) {
                    307:                        error = EINVAL;
                    308:                        break;
                    309:                }
                    310:                if (ifnet == 0) {
                    311:                        error = EADDRNOTAVAIL;
                    312:                        break;
                    313:                }
1.1       cgd       314:                if ((addr->sin_family != AF_INET) &&
1.13      mycroft   315:                     (addr->sin_family != AF_IMPLINK)) {
                    316:                        error = EAFNOSUPPORT;
                    317:                        break;
                    318:                }
                    319:                inp->inp_faddr = addr->sin_addr;
1.1       cgd       320:                soisconnected(so);
1.13      mycroft   321:                break;
                    322:            }
                    323:
                    324:        case PRU_CONNECT2:
                    325:                error = EOPNOTSUPP;
                    326:                break;
                    327:
                    328:        /*
                    329:         * Mark the connection as being incapable of further input.
                    330:         */
                    331:        case PRU_SHUTDOWN:
                    332:                socantsendmore(so);
                    333:                break;
                    334:
                    335:        /*
                    336:         * Ship a packet out.  The appropriate raw output
                    337:         * routine handles any massaging necessary.
                    338:         */
                    339:        case PRU_SEND:
                    340:            {
                    341:                register u_long dst;
                    342:
                    343:                if (so->so_state & SS_ISCONNECTED) {
                    344:                        if (nam) {
                    345:                                error = EISCONN;
                    346:                                break;
                    347:                        }
                    348:                        dst = inp->inp_faddr.s_addr;
                    349:                } else {
                    350:                        if (nam == NULL) {
                    351:                                error = ENOTCONN;
                    352:                                break;
                    353:                        }
                    354:                        dst = mtod(nam, struct sockaddr_in *)->sin_addr.s_addr;
                    355:                }
                    356:                error = rip_output(m, so, dst);
                    357:                m = NULL;
                    358:                break;
                    359:            }
                    360:
                    361:        case PRU_SENSE:
                    362:                /*
                    363:                 * stat: don't bother with a blocksize.
                    364:                 */
1.1       cgd       365:                return (0);
1.13      mycroft   366:
                    367:        /*
                    368:         * Not supported.
                    369:         */
                    370:        case PRU_RCVOOB:
                    371:        case PRU_RCVD:
                    372:        case PRU_LISTEN:
                    373:        case PRU_ACCEPT:
                    374:        case PRU_SENDOOB:
                    375:                error = EOPNOTSUPP;
                    376:                break;
                    377:
                    378:        case PRU_SOCKADDR:
                    379:                in_setsockaddr(inp, nam);
                    380:                break;
                    381:
                    382:        case PRU_PEERADDR:
                    383:                in_setpeeraddr(inp, nam);
                    384:                break;
                    385:
                    386:        default:
                    387:                panic("rip_usrreq");
1.1       cgd       388:        }
1.13      mycroft   389:        if (m != NULL)
                    390:                m_freem(m);
1.1       cgd       391:        return (error);
                    392: }

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