dest6.c revision 1.7
1 1.7 itojun /* $NetBSD: dest6.c,v 1.7 2000/02/06 12:49:42 itojun Exp $ */ 2 1.3 thorpej 3 1.2 itojun /* 4 1.2 itojun * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 5 1.2 itojun * All rights reserved. 6 1.2 itojun * 7 1.2 itojun * Redistribution and use in source and binary forms, with or without 8 1.2 itojun * modification, are permitted provided that the following conditions 9 1.2 itojun * are met: 10 1.2 itojun * 1. Redistributions of source code must retain the above copyright 11 1.2 itojun * notice, this list of conditions and the following disclaimer. 12 1.2 itojun * 2. Redistributions in binary form must reproduce the above copyright 13 1.2 itojun * notice, this list of conditions and the following disclaimer in the 14 1.2 itojun * documentation and/or other materials provided with the distribution. 15 1.2 itojun * 3. Neither the name of the project nor the names of its contributors 16 1.2 itojun * may be used to endorse or promote products derived from this software 17 1.2 itojun * without specific prior written permission. 18 1.2 itojun * 19 1.2 itojun * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 20 1.2 itojun * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 1.2 itojun * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 1.2 itojun * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 23 1.2 itojun * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 1.2 itojun * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 1.2 itojun * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 1.2 itojun * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 1.2 itojun * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 1.2 itojun * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 1.2 itojun * SUCH DAMAGE. 30 1.2 itojun */ 31 1.2 itojun 32 1.2 itojun #include <sys/param.h> 33 1.2 itojun #include <sys/systm.h> 34 1.2 itojun #include <sys/malloc.h> 35 1.2 itojun #include <sys/mbuf.h> 36 1.2 itojun #include <sys/domain.h> 37 1.2 itojun #include <sys/protosw.h> 38 1.2 itojun #include <sys/socket.h> 39 1.2 itojun #include <sys/errno.h> 40 1.2 itojun #include <sys/time.h> 41 1.2 itojun #include <sys/kernel.h> 42 1.2 itojun 43 1.2 itojun #include <net/if.h> 44 1.2 itojun #include <net/route.h> 45 1.2 itojun 46 1.2 itojun #include <netinet/in.h> 47 1.2 itojun #include <netinet/in_var.h> 48 1.7 itojun #include <netinet/ip6.h> 49 1.2 itojun #include <netinet6/in6_pcb.h> 50 1.2 itojun #include <netinet6/ip6_var.h> 51 1.7 itojun #include <netinet/icmp6.h> 52 1.2 itojun 53 1.2 itojun /* 54 1.2 itojun * Destination options header processing. 55 1.2 itojun */ 56 1.2 itojun int 57 1.2 itojun dest6_input(mp, offp, proto) 58 1.2 itojun struct mbuf **mp; 59 1.2 itojun int *offp, proto; 60 1.2 itojun { 61 1.2 itojun register struct mbuf *m = *mp; 62 1.2 itojun int off = *offp, dstoptlen, optlen; 63 1.2 itojun struct ip6_dest *dstopts; 64 1.2 itojun u_int8_t *opt; 65 1.2 itojun 66 1.2 itojun /* validation of the length of the header */ 67 1.5 itojun #ifndef PULLDOWN_TEST 68 1.2 itojun IP6_EXTHDR_CHECK(m, off, sizeof(*dstopts), IPPROTO_DONE); 69 1.2 itojun dstopts = (struct ip6_dest *)(mtod(m, caddr_t) + off); 70 1.5 itojun #else 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 1.5 itojun #endif 75 1.2 itojun dstoptlen = (dstopts->ip6d_len + 1) << 3; 76 1.2 itojun 77 1.5 itojun #ifndef PULLDOWN_TEST 78 1.2 itojun IP6_EXTHDR_CHECK(m, off, dstoptlen, IPPROTO_DONE); 79 1.2 itojun dstopts = (struct ip6_dest *)(mtod(m, caddr_t) + off); 80 1.5 itojun #else 81 1.5 itojun IP6_EXTHDR_GET(dstopts, struct ip6_dest *, m, off, dstoptlen); 82 1.5 itojun if (dstopts == NULL) 83 1.5 itojun return IPPROTO_DONE; 84 1.5 itojun #endif 85 1.2 itojun off += dstoptlen; 86 1.2 itojun dstoptlen -= sizeof(struct ip6_dest); 87 1.2 itojun opt = (u_int8_t *)dstopts + sizeof(struct ip6_dest); 88 1.2 itojun 89 1.2 itojun /* search header for all options. */ 90 1.2 itojun for (optlen = 0; dstoptlen > 0; dstoptlen -= optlen, opt += optlen) { 91 1.2 itojun switch(*opt) { 92 1.2 itojun case IP6OPT_PAD1: 93 1.2 itojun optlen = 1; 94 1.2 itojun break; 95 1.2 itojun case IP6OPT_PADN: 96 1.2 itojun if (dstoptlen < IP6OPT_MINLEN) { 97 1.2 itojun ip6stat.ip6s_toosmall++; 98 1.2 itojun goto bad; 99 1.2 itojun } 100 1.2 itojun optlen = *(opt + 1) + 2; 101 1.2 itojun break; 102 1.2 itojun default: /* unknown option */ 103 1.2 itojun if (dstoptlen < IP6OPT_MINLEN) { 104 1.2 itojun ip6stat.ip6s_toosmall++; 105 1.2 itojun goto bad; 106 1.2 itojun } 107 1.2 itojun if ((optlen = ip6_unknown_opt(opt, m, 108 1.2 itojun opt-mtod(m, u_int8_t *))) == -1) 109 1.2 itojun return(IPPROTO_DONE); 110 1.2 itojun optlen += 2; 111 1.2 itojun break; 112 1.2 itojun } 113 1.2 itojun } 114 1.2 itojun 115 1.2 itojun *offp = off; 116 1.2 itojun return(dstopts->ip6d_nxt); 117 1.2 itojun 118 1.2 itojun bad: 119 1.2 itojun m_freem(m); 120 1.2 itojun return(IPPROTO_DONE); 121 1.2 itojun } 122
Indexes created Mon Sep 29 21:09:56 GMT 2025