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Annotation of src/sys/netinet6/route6.c, Revision 1.6

1.6     ! itojun      1: /*     $NetBSD: route6.c,v 1.5 2000/01/31 10:33:23 itojun Exp $        */
1.3       thorpej     2:
1.2       itojun      3: /*
                      4:  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
                      5:  * All rights reserved.
                      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. Neither the name of the project nor the names of its contributors
                     16:  *    may be used to endorse or promote products derived from this software
                     17:  *    without specific prior written permission.
                     18:  *
                     19:  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
                     20:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     21:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     22:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
                     23:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     24:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     25:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     26:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     27:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     28:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     29:  * SUCH DAMAGE.
                     30:  */
                     31:
                     32: #include <sys/param.h>
                     33: #include <sys/mbuf.h>
                     34: #include <sys/socket.h>
1.4       itojun     35: #include <sys/systm.h>
1.2       itojun     36:
                     37: #include <net/if.h>
                     38:
                     39: #include <netinet/in.h>
1.4       itojun     40: #include <netinet6/in6_var.h>
1.6     ! itojun     41: #include <netinet/ip6.h>
1.2       itojun     42: #include <netinet6/ip6_var.h>
                     43:
                     44: #include <netinet/icmp6.h>
                     45:
                     46: static int ip6_rthdr0 __P((struct mbuf *, struct ip6_hdr *, struct ip6_rthdr0 *));
                     47:
                     48: int
                     49: route6_input(mp, offp, proto)
                     50:        struct mbuf **mp;
                     51:        int *offp, proto;       /* proto is unused */
                     52: {
                     53:        register struct ip6_hdr *ip6;
                     54:        register struct mbuf *m = *mp;
                     55:        register struct ip6_rthdr *rh;
                     56:        int off = *offp, rhlen;
                     57:
1.4       itojun     58: #ifndef PULLDOWN_TEST
1.2       itojun     59:        IP6_EXTHDR_CHECK(m, off, sizeof(*rh), IPPROTO_DONE);
                     60:        ip6 = mtod(m, struct ip6_hdr *);
                     61:        rh = (struct ip6_rthdr *)((caddr_t)ip6 + off);
1.4       itojun     62: #else
                     63:        ip6 = mtod(m, struct ip6_hdr *);
                     64:        IP6_EXTHDR_GET(rh, struct ip6_rthdr *, m, off, sizeof(*rh));
                     65:        if (rh == NULL) {
                     66:                ip6stat.ip6s_tooshort++;
                     67:                return IPPROTO_DONE;
                     68:        }
                     69: #endif
1.2       itojun     70:
                     71:        switch(rh->ip6r_type) {
                     72:         case IPV6_RTHDR_TYPE_0:
                     73:                 rhlen = (rh->ip6r_len + 1) << 3;
1.4       itojun     74: #ifndef PULLDOWN_TEST
1.2       itojun     75:                 IP6_EXTHDR_CHECK(m, off, rhlen, IPPROTO_DONE);
1.4       itojun     76: #else
                     77:                 IP6_EXTHDR_GET(rh, struct ip6_rthdr *, m, off, rhlen);
                     78:                 if (rh == NULL) {
                     79:                        ip6stat.ip6s_tooshort++;
                     80:                        return IPPROTO_DONE;
                     81:                 }
                     82: #endif
1.2       itojun     83:                 if (ip6_rthdr0(m, ip6, (struct ip6_rthdr0 *)rh))
                     84:                         return(IPPROTO_DONE);
                     85:                 break;
                     86:         default:
                     87:                 /* unknown routing type */
                     88:                 if (rh->ip6r_segleft == 0) {
                     89:                         rhlen = (rh->ip6r_len + 1) << 3;
                     90:                         break; /* Final dst. Just ignore the header. */
                     91:                 }
                     92:                 ip6stat.ip6s_badoptions++;
                     93:                 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER,
                     94:                             (caddr_t)&rh->ip6r_type - (caddr_t)ip6);
                     95:                 return(IPPROTO_DONE);
                     96:        }
                     97:
                     98:        *offp += rhlen;
                     99:        return(rh->ip6r_nxt);
                    100: }
                    101:
                    102: /*
                    103:  * Type0 routing header processing
                    104:  */
                    105: static int
                    106: ip6_rthdr0(m, ip6, rh0)
                    107:        struct mbuf *m;
                    108:        struct ip6_hdr *ip6;
                    109:        struct ip6_rthdr0 *rh0;
                    110: {
                    111:        int addrs, index;
                    112:        struct in6_addr *nextaddr, tmpaddr;
                    113:
                    114:        if (rh0->ip6r0_segleft == 0)
                    115:                return(0);
                    116:
                    117:        if (rh0->ip6r0_len % 2
                    118: #ifdef COMPAT_RFC1883
                    119:            || rh0->ip6r0_len > 46
                    120: #endif
                    121:                ) {
                    122:                /*
                    123:                 * Type 0 routing header can't contain more than 23 addresses.
                    124:                 * RFC 2462: this limitation was removed since stict/loose
                    125:                 * bitmap field was deleted.
                    126:                 */
                    127:                ip6stat.ip6s_badoptions++;
                    128:                icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER,
                    129:                            (caddr_t)&rh0->ip6r0_len - (caddr_t)ip6);
                    130:                return(-1);
                    131:        }
                    132:
                    133:        if ((addrs = rh0->ip6r0_len / 2) < rh0->ip6r0_segleft) {
                    134:                ip6stat.ip6s_badoptions++;
                    135:                icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER,
                    136:                            (caddr_t)&rh0->ip6r0_segleft - (caddr_t)ip6);
                    137:                return(-1);
                    138:        }
                    139:
                    140:        index = addrs - rh0->ip6r0_segleft;
                    141:        rh0->ip6r0_segleft--;
                    142:        nextaddr = rh0->ip6r0_addr + index;
                    143:
1.5       itojun    144:        /*
                    145:         * reject invalid addresses.  be proactive about malicious use of
                    146:         * IPv4 mapped/compat address.
                    147:         * XXX need more checks?
                    148:         */
1.2       itojun    149:        if (IN6_IS_ADDR_MULTICAST(nextaddr) ||
1.5       itojun    150:            IN6_IS_ADDR_UNSPECIFIED(nextaddr) ||
                    151:            IN6_IS_ADDR_V4MAPPED(nextaddr) ||
                    152:            IN6_IS_ADDR_V4COMPAT(nextaddr)) {
                    153:                ip6stat.ip6s_badoptions++;
                    154:                m_freem(m);
                    155:                return(-1);
                    156:        }
                    157:        if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
                    158:            IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst) ||
                    159:            IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst) ||
                    160:            IN6_IS_ADDR_V4COMPAT(nextaddr)) {
1.2       itojun    161:                ip6stat.ip6s_badoptions++;
                    162:                m_freem(m);
                    163:                return(-1);
                    164:        }
                    165:
                    166:        /*
                    167:         * Swap the IPv6 destination address and nextaddr. Forward the packet.
                    168:         */
                    169:        tmpaddr = *nextaddr;
                    170:        *nextaddr = ip6->ip6_dst;
                    171:        if (IN6_IS_ADDR_LINKLOCAL(nextaddr))
                    172:                nextaddr->s6_addr16[1] = 0;
                    173:        ip6->ip6_dst = tmpaddr;
                    174:        if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst))
                    175:                ip6->ip6_dst.s6_addr16[1] = htons(m->m_pkthdr.rcvif->if_index);
                    176:
                    177: #ifdef COMPAT_RFC1883
                    178:        if (rh0->ip6r0_slmap[index / 8] & (1 << (7 - (index % 8))))
                    179:                ip6_forward(m, IPV6_SRCRT_NEIGHBOR);
                    180:        else
                    181:                ip6_forward(m, IPV6_SRCRT_NOTNEIGHBOR);
                    182: #else
                    183:        ip6_forward(m, 1);
                    184: #endif
                    185:
                    186:        return(-1);                     /* m would be freed in ip6_forward() */
                    187: }

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