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Annotation of src/sys/netinet/raw_ip.c, Revision 1.5

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
1.5     ! cgd        34:  *     $Id: raw_ip.c,v 1.4 1993/05/21 05:27:15 cgd Exp $
1.1       cgd        35:  */
                     36:
                     37: #include "param.h"
                     38: #include "malloc.h"
                     39: #include "mbuf.h"
                     40: #include "socket.h"
                     41: #include "protosw.h"
                     42: #include "socketvar.h"
                     43: #include "errno.h"
                     44:
                     45: #include "../net/if.h"
                     46: #include "../net/route.h"
                     47: #include "../net/raw_cb.h"
                     48:
                     49: #include "in.h"
                     50: #include "in_systm.h"
                     51: #include "ip.h"
                     52: #include "ip_var.h"
                     53: #include "in_pcb.h"
                     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,
                    122:           (so->so_options & SO_DONTROUTE) | IP_ALLOWBROADCAST));
                    123: }
                    124:
                    125: /*
                    126:  * Raw IP socket option processing.
                    127:  */
                    128: rip_ctloutput(op, so, level, optname, m)
                    129:        int op;
                    130:        struct socket *so;
                    131:        int level, optname;
                    132:        struct mbuf **m;
                    133: {
                    134:        int error = 0;
                    135:        register struct raw_inpcb *rp = sotorawinpcb(so);
                    136:
                    137:        if (level != IPPROTO_IP)
                    138:                error = EINVAL;
                    139:        else switch (op) {
                    140:
                    141:        case PRCO_SETOPT:
                    142:                switch (optname) {
                    143:
                    144:                case IP_OPTIONS:
                    145:                        return (ip_pcbopts(&rp->rinp_options, *m));
                    146:
                    147:                case IP_HDRINCL:
                    148:                        if (m == 0 || *m == 0 || (*m)->m_len < sizeof (int)) {
                    149:                                error = EINVAL;
                    150:                                break;
                    151:                        }
                    152:                        if (*mtod(*m, int *))
                    153:                                rp->rinp_flags |= RINPF_HDRINCL;
                    154:                        else
                    155:                                rp->rinp_flags &= ~RINPF_HDRINCL;
                    156:                        break;
                    157:
                    158:                default:
                    159:                        error = EINVAL;
                    160:                        break;
                    161:                }
                    162:                break;
                    163:
                    164:        case PRCO_GETOPT:
                    165:                *m = m_get(M_WAIT, MT_SOOPTS);
                    166:                switch (optname) {
                    167:
                    168:                case IP_OPTIONS:
                    169:                        if (rp->rinp_options) {
                    170:                                (*m)->m_len = rp->rinp_options->m_len;
                    171:                                bcopy(mtod(rp->rinp_options, caddr_t),
                    172:                                    mtod(*m, caddr_t), (unsigned)(*m)->m_len);
                    173:                        } else
                    174:                                (*m)->m_len = 0;
                    175:                        break;
                    176:
                    177:                case IP_HDRINCL:
                    178:                        (*m)->m_len = sizeof (int);
                    179:                        *mtod(*m, int *) = rp->rinp_flags & RINPF_HDRINCL;
                    180:                        break;
                    181:
                    182:                default:
                    183:                        error = EINVAL;
                    184:                        m_freem(*m);
                    185:                        *m = 0;
                    186:                        break;
                    187:                }
                    188:                break;
                    189:        }
                    190:        if (op == PRCO_SETOPT && *m)
                    191:                (void)m_free(*m);
                    192:        return (error);
                    193: }
                    194:
                    195: /*ARGSUSED*/
1.2       cgd       196: rip_usrreq(so, req, m, nam, control)
1.1       cgd       197:        register struct socket *so;
                    198:        int req;
1.2       cgd       199:        struct mbuf *m, *nam, *control;
1.1       cgd       200: {
                    201:        register int error = 0;
                    202:        register struct raw_inpcb *rp = sotorawinpcb(so);
                    203:
                    204:        switch (req) {
                    205:
                    206:        case PRU_ATTACH:
                    207:                if (rp)
                    208:                        panic("rip_attach");
                    209:                MALLOC(rp, struct raw_inpcb *, sizeof *rp, M_PCB, M_WAITOK);
                    210:                if (rp == 0)
                    211:                        return (ENOBUFS);
                    212:                bzero((caddr_t)rp, sizeof *rp);
                    213:                so->so_pcb = (caddr_t)rp;
                    214:                break;
                    215:
                    216:        case PRU_DETACH:
                    217:                if (rp == 0)
                    218:                        panic("rip_detach");
                    219:                if (rp->rinp_options)
                    220:                        m_freem(rp->rinp_options);
                    221:                if (rp->rinp_route.ro_rt)
                    222:                        RTFREE(rp->rinp_route.ro_rt);
                    223:                if (rp->rinp_rcb.rcb_laddr)
                    224:                        rp->rinp_rcb.rcb_laddr = 0;
                    225:                break;
                    226:
                    227:        case PRU_BIND:
                    228:            {
                    229:                struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *);
                    230:
                    231:                if (nam->m_len != sizeof(*addr))
                    232:                        return (EINVAL);
                    233:                if ((ifnet == 0) ||
                    234:                    ((addr->sin_family != AF_INET) &&
                    235:                     (addr->sin_family != AF_IMPLINK)) ||
                    236:                    (addr->sin_addr.s_addr &&
                    237:                     ifa_ifwithaddr((struct sockaddr *)addr) == 0))
                    238:                        return (EADDRNOTAVAIL);
                    239:                rp->rinp_rcb.rcb_laddr = (struct sockaddr *)&rp->rinp_laddr;
                    240:                rp->rinp_laddr = *addr;
                    241:                return (0);
                    242:            }
                    243:        case PRU_CONNECT:
                    244:            {
                    245:                struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *);
                    246:
                    247:                if (nam->m_len != sizeof(*addr))
                    248:                        return (EINVAL);
                    249:                if (ifnet == 0)
                    250:                        return (EADDRNOTAVAIL);
                    251:                if ((addr->sin_family != AF_INET) &&
                    252:                     (addr->sin_family != AF_IMPLINK))
                    253:                        return (EAFNOSUPPORT);
                    254:                rp->rinp_rcb.rcb_faddr = (struct sockaddr *)&rp->rinp_faddr;
                    255:                rp->rinp_faddr = *addr;
                    256:                soisconnected(so);
                    257:                return (0);
                    258:            }
                    259:        }
                    260:        error =  raw_usrreq(so, req, m, nam, control);
                    261:
                    262:        if (error && (req == PRU_ATTACH) && so->so_pcb)
                    263:                free(so->so_pcb, M_PCB);
                    264:        return (error);
                    265: }

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