dest6.c revision 1.8
1 1.8 itojun /* $NetBSD: dest6.c,v 1.8 2001/01/23 05:21:23 itojun Exp $ */ 2 1.8 itojun /* $KAME: dest6.c,v 1.14 2001/01/23 05:16:28 itojun Exp $ */ 3 1.3 thorpej 4 1.2 itojun /* 5 1.2 itojun * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 6 1.2 itojun * All rights reserved. 7 1.8 itojun * 8 1.2 itojun * Redistribution and use in source and binary forms, with or without 9 1.2 itojun * modification, are permitted provided that the following conditions 10 1.2 itojun * are met: 11 1.2 itojun * 1. Redistributions of source code must retain the above copyright 12 1.2 itojun * notice, this list of conditions and the following disclaimer. 13 1.2 itojun * 2. Redistributions in binary form must reproduce the above copyright 14 1.2 itojun * notice, this list of conditions and the following disclaimer in the 15 1.2 itojun * documentation and/or other materials provided with the distribution. 16 1.2 itojun * 3. Neither the name of the project nor the names of its contributors 17 1.2 itojun * may be used to endorse or promote products derived from this software 18 1.2 itojun * without specific prior written permission. 19 1.8 itojun * 20 1.2 itojun * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 1.2 itojun * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 1.2 itojun * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 1.2 itojun * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 1.2 itojun * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 1.2 itojun * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 1.2 itojun * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 1.2 itojun * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 1.2 itojun * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 1.2 itojun * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 1.2 itojun * SUCH DAMAGE. 31 1.2 itojun */ 32 1.2 itojun 33 1.2 itojun #include <sys/param.h> 34 1.2 itojun #include <sys/systm.h> 35 1.2 itojun #include <sys/malloc.h> 36 1.2 itojun #include <sys/mbuf.h> 37 1.2 itojun #include <sys/domain.h> 38 1.2 itojun #include <sys/protosw.h> 39 1.2 itojun #include <sys/socket.h> 40 1.2 itojun #include <sys/errno.h> 41 1.2 itojun #include <sys/time.h> 42 1.2 itojun #include <sys/kernel.h> 43 1.2 itojun 44 1.2 itojun #include <net/if.h> 45 1.2 itojun #include <net/route.h> 46 1.2 itojun 47 1.2 itojun #include <netinet/in.h> 48 1.2 itojun #include <netinet/in_var.h> 49 1.7 itojun #include <netinet/ip6.h> 50 1.2 itojun #include <netinet6/in6_pcb.h> 51 1.2 itojun #include <netinet6/ip6_var.h> 52 1.7 itojun #include <netinet/icmp6.h> 53 1.2 itojun 54 1.2 itojun /* 55 1.2 itojun * Destination options header processing. 56 1.2 itojun */ 57 1.2 itojun int 58 1.2 itojun dest6_input(mp, offp, proto) 59 1.2 itojun struct mbuf **mp; 60 1.2 itojun int *offp, proto; 61 1.2 itojun { 62 1.8 itojun struct mbuf *m = *mp; 63 1.2 itojun int off = *offp, dstoptlen, optlen; 64 1.2 itojun struct ip6_dest *dstopts; 65 1.2 itojun u_int8_t *opt; 66 1.2 itojun 67 1.2 itojun /* validation of the length of the header */ 68 1.5 itojun #ifndef PULLDOWN_TEST 69 1.2 itojun IP6_EXTHDR_CHECK(m, off, sizeof(*dstopts), IPPROTO_DONE); 70 1.2 itojun dstopts = (struct ip6_dest *)(mtod(m, caddr_t) + off); 71 1.5 itojun #else 72 1.5 itojun IP6_EXTHDR_GET(dstopts, struct ip6_dest *, m, off, sizeof(*dstopts)); 73 1.5 itojun if (dstopts == NULL) 74 1.5 itojun return IPPROTO_DONE; 75 1.5 itojun #endif 76 1.2 itojun dstoptlen = (dstopts->ip6d_len + 1) << 3; 77 1.2 itojun 78 1.5 itojun #ifndef PULLDOWN_TEST 79 1.2 itojun IP6_EXTHDR_CHECK(m, off, dstoptlen, IPPROTO_DONE); 80 1.2 itojun dstopts = (struct ip6_dest *)(mtod(m, caddr_t) + off); 81 1.5 itojun #else 82 1.5 itojun IP6_EXTHDR_GET(dstopts, struct ip6_dest *, m, off, dstoptlen); 83 1.5 itojun if (dstopts == NULL) 84 1.5 itojun return IPPROTO_DONE; 85 1.5 itojun #endif 86 1.2 itojun off += dstoptlen; 87 1.2 itojun dstoptlen -= sizeof(struct ip6_dest); 88 1.2 itojun opt = (u_int8_t *)dstopts + sizeof(struct ip6_dest); 89 1.2 itojun 90 1.2 itojun /* search header for all options. */ 91 1.2 itojun for (optlen = 0; dstoptlen > 0; dstoptlen -= optlen, opt += optlen) { 92 1.8 itojun switch (*opt) { 93 1.8 itojun case IP6OPT_PAD1: 94 1.8 itojun optlen = 1; 95 1.8 itojun break; 96 1.8 itojun case IP6OPT_PADN: 97 1.8 itojun if (dstoptlen < IP6OPT_MINLEN) { 98 1.8 itojun ip6stat.ip6s_toosmall++; 99 1.8 itojun goto bad; 100 1.8 itojun } 101 1.8 itojun optlen = *(opt + 1) + 2; 102 1.8 itojun break; 103 1.8 itojun default: /* unknown option */ 104 1.8 itojun if (dstoptlen < IP6OPT_MINLEN) { 105 1.8 itojun ip6stat.ip6s_toosmall++; 106 1.8 itojun goto bad; 107 1.8 itojun } 108 1.8 itojun optlen = ip6_unknown_opt(opt, m, 109 1.8 itojun opt - mtod(m, u_int8_t *)); 110 1.8 itojun if (optlen == -1) 111 1.8 itojun return (IPPROTO_DONE); 112 1.8 itojun optlen += 2; 113 1.8 itojun break; 114 1.2 itojun } 115 1.2 itojun } 116 1.2 itojun 117 1.2 itojun *offp = off; 118 1.8 itojun return (dstopts->ip6d_nxt); 119 1.2 itojun 120 1.2 itojun bad: 121 1.2 itojun m_freem(m); 122 1.8 itojun return (IPPROTO_DONE); 123 1.2 itojun } 124
Indexes created Mon Sep 29 21:09:56 GMT 2025