| | 1 | /* $KAME: dest6.c,v 1.10 2000/02/28 16:18:11 itojun Exp $ */ |
| | 2 | |
| | 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/systm.h> |
| | 34 | #include <sys/malloc.h> |
| | 35 | #include <sys/mbuf.h> |
| | 36 | #include <sys/domain.h> |
| | 37 | #include <sys/protosw.h> |
| | 38 | #include <sys/socket.h> |
| | 39 | #include <sys/errno.h> |
| | 40 | #include <sys/time.h> |
| | 41 | #include <sys/kernel.h> |
| | 42 | |
| | 43 | #include <net/if.h> |
| | 44 | #include <net/route.h> |
| | 45 | |
| | 46 | #include <netinet/in.h> |
| | 47 | #include <netinet/in_var.h> |
| | 48 | #include <netinet/ip6.h> |
| | 49 | #include <netinet6/ip6_var.h> |
| | 50 | #if !(defined(__APPLE__)) |
| | 51 | #include <netinet6/in6_pcb.h> |
| | 52 | #endif |
| | 53 | #include <netinet/icmp6.h> |
| | 54 | |
| | 55 | #if MIP6 |
| | 56 | int (*mip6_store_dstopt_pre_hook)(struct mbuf *m, u_int8_t *opt, |
| | 57 | u_int8_t off, u_int8_t dstlen) = NULL; |
| | 58 | int (*mip6_rec_ctrl_sig_hook)(struct mbuf *m, int off) = NULL; |
| | 59 | #endif /* MIP6 */ |
| | 60 | |
| | 61 | /* |
| | 62 | * Destination options header processing. |
| | 63 | */ |
| | 64 | int |
| | 65 | dest6_input(mp, offp, proto) |
| | 66 | struct mbuf **mp; |
| | 67 | int *offp, proto; |
| | 68 | { |
| | 69 | register struct mbuf *m = *mp; |
| | 70 | int off = *offp, dstoptlen, optlen; |
| | 71 | struct ip6_dest *dstopts; |
| | 72 | u_int8_t *opt; |
| | 73 | |
| | 74 | /* validation of the length of the header */ |
| | 75 | #ifndef PULLDOWN_TEST |
| | 76 | IP6_EXTHDR_CHECK(m, off, sizeof(*dstopts), IPPROTO_DONE); |
| | 77 | dstopts = (struct ip6_dest *)(mtod(m, caddr_t) + off); |
| | 78 | #else |
| | 79 | IP6_EXTHDR_GET(dstopts, struct ip6_dest *, m, off, sizeof(*dstopts)); |
| | 80 | if (dstopts == NULL) |
| | 81 | return IPPROTO_DONE; |
| | 82 | #endif |
| | 83 | dstoptlen = (dstopts->ip6d_len + 1) << 3; |
| | 84 | |
| | 85 | #ifndef PULLDOWN_TEST |
| | 86 | IP6_EXTHDR_CHECK(m, off, dstoptlen, IPPROTO_DONE); |
| | 87 | dstopts = (struct ip6_dest *)(mtod(m, caddr_t) + off); |
| | 88 | #else |
| | 89 | IP6_EXTHDR_GET(dstopts, struct ip6_dest *, m, off, dstoptlen); |
| | 90 | if (dstopts == NULL) |
| | 91 | return IPPROTO_DONE; |
| | 92 | #endif |
| | 93 | off += dstoptlen; |
| | 94 | dstoptlen -= sizeof(struct ip6_dest); |
| | 95 | opt = (u_int8_t *)dstopts + sizeof(struct ip6_dest); |
| | 96 | |
| | 97 | /* search header for all options. */ |
| | 98 | for (optlen = 0; dstoptlen > 0; dstoptlen -= optlen, opt += optlen) { |
| | 99 | switch(*opt) { |
| | 100 | case IP6OPT_PAD1: |
| | 101 | optlen = 1; |
| | 102 | break; |
| | 103 | case IP6OPT_PADN: |
| | 104 | if (dstoptlen < IP6OPT_MINLEN) { |
| | 105 | ip6stat.ip6s_toosmall++; |
| | 106 | goto bad; |
| | 107 | } |
| | 108 | optlen = *(opt + 1) + 2; |
| | 109 | break; |
| | 110 | |
| | 111 | #if MIP6 |
| | 112 | case IP6OPT_BINDING_UPDATE: |
| | 113 | case IP6OPT_BINDING_ACK: |
| | 114 | case IP6OPT_BINDING_REQ: |
| | 115 | case IP6OPT_HOME_ADDRESS: |
| | 116 | if (mip6_store_dstopt_pre_hook) { |
| | 117 | if ((*mip6_store_dstopt_pre_hook)(m, opt, off, dstoptlen) != 0) |
| | 118 | goto bad; |
| | 119 | } |
| | 120 | optlen = *(opt + 1) + 2; |
| | 121 | break; |
| | 122 | #endif /* MIP6 */ |
| | 123 | |
| | 124 | default: /* unknown option */ |
| | 125 | if (dstoptlen < IP6OPT_MINLEN) { |
| | 126 | ip6stat.ip6s_toosmall++; |
| | 127 | goto bad; |
| | 128 | } |
| | 129 | if ((optlen = ip6_unknown_opt(opt, m, |
| | 130 | opt-mtod(m, u_int8_t *))) == -1) |
| | 131 | return(IPPROTO_DONE); |
| | 132 | optlen += 2; |
| | 133 | break; |
| | 134 | } |
| | 135 | } |
| | 136 | |
| | 137 | #if MIP6 |
| | 138 | if (mip6_rec_ctrl_sig_hook) { |
| | 139 | /* |
| | 140 | * All Destinations options have been processed. Call MIPv6 to |
| | 141 | * process stored options. |
| | 142 | */ |
| | 143 | if ((*mip6_rec_ctrl_sig_hook)(m, *offp) != 0) |
| | 144 | return(IPPROTO_DONE); |
| | 145 | } |
| | 146 | #endif /* MIP6 */ |
| | 147 | |
| | 148 | *offp = off; |
| | 149 | return(dstopts->ip6d_nxt); |
| | 150 | |
| | 151 | bad: |
| | 152 | m_freem(m); |
| | 153 | return(IPPROTO_DONE); |
| | 154 | } |
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