dest6.c revision 1.12
1 1.12 itojun /* $NetBSD: dest6.c,v 1.12 2003/05/14 06:47:39 itojun Exp $ */ 2 1.10 itojun /* $KAME: dest6.c,v 1.25 2001/02/22 01:39:16 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 1.11 lukem 33 1.11 lukem #include <sys/cdefs.h> 34 1.12 itojun __KERNEL_RCSID(0, "$NetBSD: dest6.c,v 1.12 2003/05/14 06:47:39 itojun Exp $"); 35 1.2 itojun 36 1.2 itojun #include <sys/param.h> 37 1.2 itojun #include <sys/systm.h> 38 1.2 itojun #include <sys/malloc.h> 39 1.2 itojun #include <sys/mbuf.h> 40 1.2 itojun #include <sys/domain.h> 41 1.2 itojun #include <sys/protosw.h> 42 1.2 itojun #include <sys/socket.h> 43 1.2 itojun #include <sys/errno.h> 44 1.2 itojun #include <sys/time.h> 45 1.2 itojun #include <sys/kernel.h> 46 1.2 itojun 47 1.2 itojun #include <net/if.h> 48 1.2 itojun #include <net/route.h> 49 1.2 itojun 50 1.2 itojun #include <netinet/in.h> 51 1.2 itojun #include <netinet/in_var.h> 52 1.7 itojun #include <netinet/ip6.h> 53 1.2 itojun #include <netinet6/in6_pcb.h> 54 1.2 itojun #include <netinet6/ip6_var.h> 55 1.7 itojun #include <netinet/icmp6.h> 56 1.2 itojun 57 1.2 itojun /* 58 1.2 itojun * Destination options header processing. 59 1.2 itojun */ 60 1.2 itojun int 61 1.2 itojun dest6_input(mp, offp, proto) 62 1.2 itojun struct mbuf **mp; 63 1.2 itojun int *offp, proto; 64 1.2 itojun { 65 1.8 itojun struct mbuf *m = *mp; 66 1.2 itojun int off = *offp, dstoptlen, optlen; 67 1.2 itojun struct ip6_dest *dstopts; 68 1.2 itojun u_int8_t *opt; 69 1.2 itojun 70 1.2 itojun /* validation of the length of the header */ 71 1.5 itojun IP6_EXTHDR_GET(dstopts, struct ip6_dest *, m, off, sizeof(*dstopts)); 72 1.5 itojun if (dstopts == NULL) 73 1.5 itojun return IPPROTO_DONE; 74 1.2 itojun dstoptlen = (dstopts->ip6d_len + 1) << 3; 75 1.2 itojun 76 1.5 itojun IP6_EXTHDR_GET(dstopts, struct ip6_dest *, m, off, dstoptlen); 77 1.5 itojun if (dstopts == NULL) 78 1.5 itojun return IPPROTO_DONE; 79 1.2 itojun off += dstoptlen; 80 1.2 itojun dstoptlen -= sizeof(struct ip6_dest); 81 1.2 itojun opt = (u_int8_t *)dstopts + sizeof(struct ip6_dest); 82 1.2 itojun 83 1.2 itojun /* search header for all options. */ 84 1.2 itojun for (optlen = 0; dstoptlen > 0; dstoptlen -= optlen, opt += optlen) { 85 1.10 itojun if (*opt != IP6OPT_PAD1 && 86 1.10 itojun (dstoptlen < IP6OPT_MINLEN || *(opt + 1) + 2 > dstoptlen)) { 87 1.9 itojun ip6stat.ip6s_toosmall++; 88 1.9 itojun goto bad; 89 1.9 itojun } 90 1.9 itojun 91 1.8 itojun switch (*opt) { 92 1.8 itojun case IP6OPT_PAD1: 93 1.8 itojun optlen = 1; 94 1.8 itojun break; 95 1.8 itojun case IP6OPT_PADN: 96 1.8 itojun optlen = *(opt + 1) + 2; 97 1.8 itojun break; 98 1.8 itojun default: /* unknown option */ 99 1.8 itojun optlen = ip6_unknown_opt(opt, m, 100 1.8 itojun opt - mtod(m, u_int8_t *)); 101 1.8 itojun if (optlen == -1) 102 1.8 itojun return (IPPROTO_DONE); 103 1.8 itojun optlen += 2; 104 1.8 itojun break; 105 1.2 itojun } 106 1.2 itojun } 107 1.2 itojun 108 1.2 itojun *offp = off; 109 1.8 itojun return (dstopts->ip6d_nxt); 110 1.2 itojun 111 1.2 itojun bad: 112 1.2 itojun m_freem(m); 113 1.8 itojun return (IPPROTO_DONE); 114 1.2 itojun } 115
Indexes created Sun Oct 19 02:09:48 GMT 2025