dest6.c revision 1.2.2.2
1 1.2.2.2 thorpej /* 2 1.2.2.2 thorpej * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 3 1.2.2.2 thorpej * All rights reserved. 4 1.2.2.2 thorpej * 5 1.2.2.2 thorpej * Redistribution and use in source and binary forms, with or without 6 1.2.2.2 thorpej * modification, are permitted provided that the following conditions 7 1.2.2.2 thorpej * are met: 8 1.2.2.2 thorpej * 1. Redistributions of source code must retain the above copyright 9 1.2.2.2 thorpej * notice, this list of conditions and the following disclaimer. 10 1.2.2.2 thorpej * 2. Redistributions in binary form must reproduce the above copyright 11 1.2.2.2 thorpej * notice, this list of conditions and the following disclaimer in the 12 1.2.2.2 thorpej * documentation and/or other materials provided with the distribution. 13 1.2.2.2 thorpej * 3. Neither the name of the project nor the names of its contributors 14 1.2.2.2 thorpej * may be used to endorse or promote products derived from this software 15 1.2.2.2 thorpej * without specific prior written permission. 16 1.2.2.2 thorpej * 17 1.2.2.2 thorpej * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 18 1.2.2.2 thorpej * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 1.2.2.2 thorpej * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 1.2.2.2 thorpej * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 21 1.2.2.2 thorpej * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 1.2.2.2 thorpej * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 1.2.2.2 thorpej * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 1.2.2.2 thorpej * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 1.2.2.2 thorpej * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 1.2.2.2 thorpej * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 1.2.2.2 thorpej * SUCH DAMAGE. 28 1.2.2.2 thorpej */ 29 1.2.2.2 thorpej 30 1.2.2.2 thorpej #include <sys/param.h> 31 1.2.2.2 thorpej #include <sys/systm.h> 32 1.2.2.2 thorpej #include <sys/malloc.h> 33 1.2.2.2 thorpej #include <sys/mbuf.h> 34 1.2.2.2 thorpej #include <sys/domain.h> 35 1.2.2.2 thorpej #include <sys/protosw.h> 36 1.2.2.2 thorpej #include <sys/socket.h> 37 1.2.2.2 thorpej #include <sys/errno.h> 38 1.2.2.2 thorpej #include <sys/time.h> 39 1.2.2.2 thorpej #include <sys/kernel.h> 40 1.2.2.2 thorpej 41 1.2.2.2 thorpej #include <net/if.h> 42 1.2.2.2 thorpej #include <net/route.h> 43 1.2.2.2 thorpej 44 1.2.2.2 thorpej #include <netinet/in.h> 45 1.2.2.2 thorpej #include <netinet/in_var.h> 46 1.2.2.2 thorpej #include <netinet6/in6_systm.h> 47 1.2.2.2 thorpej #include <netinet6/ip6.h> 48 1.2.2.2 thorpej #if !defined(__FreeBSD__) || __FreeBSD__ < 3 49 1.2.2.2 thorpej #include <netinet6/in6_pcb.h> 50 1.2.2.2 thorpej #endif 51 1.2.2.2 thorpej #include <netinet6/ip6_var.h> 52 1.2.2.2 thorpej #include <netinet6/icmp6.h> 53 1.2.2.2 thorpej 54 1.2.2.2 thorpej /* 55 1.2.2.2 thorpej * Destination options header processing. 56 1.2.2.2 thorpej */ 57 1.2.2.2 thorpej int 58 1.2.2.2 thorpej dest6_input(mp, offp, proto) 59 1.2.2.2 thorpej struct mbuf **mp; 60 1.2.2.2 thorpej int *offp, proto; 61 1.2.2.2 thorpej { 62 1.2.2.2 thorpej register struct mbuf *m = *mp; 63 1.2.2.2 thorpej int off = *offp, dstoptlen, optlen; 64 1.2.2.2 thorpej struct ip6_dest *dstopts; 65 1.2.2.2 thorpej u_int8_t *opt; 66 1.2.2.2 thorpej 67 1.2.2.2 thorpej /* validation of the length of the header */ 68 1.2.2.2 thorpej IP6_EXTHDR_CHECK(m, off, sizeof(*dstopts), IPPROTO_DONE); 69 1.2.2.2 thorpej dstopts = (struct ip6_dest *)(mtod(m, caddr_t) + off); 70 1.2.2.2 thorpej dstoptlen = (dstopts->ip6d_len + 1) << 3; 71 1.2.2.2 thorpej 72 1.2.2.2 thorpej IP6_EXTHDR_CHECK(m, off, dstoptlen, IPPROTO_DONE); 73 1.2.2.2 thorpej dstopts = (struct ip6_dest *)(mtod(m, caddr_t) + off); 74 1.2.2.2 thorpej off += dstoptlen; 75 1.2.2.2 thorpej dstoptlen -= sizeof(struct ip6_dest); 76 1.2.2.2 thorpej opt = (u_int8_t *)dstopts + sizeof(struct ip6_dest); 77 1.2.2.2 thorpej 78 1.2.2.2 thorpej /* search header for all options. */ 79 1.2.2.2 thorpej for (optlen = 0; dstoptlen > 0; dstoptlen -= optlen, opt += optlen) { 80 1.2.2.2 thorpej switch(*opt) { 81 1.2.2.2 thorpej case IP6OPT_PAD1: 82 1.2.2.2 thorpej optlen = 1; 83 1.2.2.2 thorpej break; 84 1.2.2.2 thorpej case IP6OPT_PADN: 85 1.2.2.2 thorpej if (dstoptlen < IP6OPT_MINLEN) { 86 1.2.2.2 thorpej ip6stat.ip6s_toosmall++; 87 1.2.2.2 thorpej goto bad; 88 1.2.2.2 thorpej } 89 1.2.2.2 thorpej optlen = *(opt + 1) + 2; 90 1.2.2.2 thorpej break; 91 1.2.2.2 thorpej default: /* unknown option */ 92 1.2.2.2 thorpej if (dstoptlen < IP6OPT_MINLEN) { 93 1.2.2.2 thorpej ip6stat.ip6s_toosmall++; 94 1.2.2.2 thorpej goto bad; 95 1.2.2.2 thorpej } 96 1.2.2.2 thorpej if ((optlen = ip6_unknown_opt(opt, m, 97 1.2.2.2 thorpej opt-mtod(m, u_int8_t *))) == -1) 98 1.2.2.2 thorpej return(IPPROTO_DONE); 99 1.2.2.2 thorpej optlen += 2; 100 1.2.2.2 thorpej break; 101 1.2.2.2 thorpej } 102 1.2.2.2 thorpej } 103 1.2.2.2 thorpej 104 1.2.2.2 thorpej *offp = off; 105 1.2.2.2 thorpej return(dstopts->ip6d_nxt); 106 1.2.2.2 thorpej 107 1.2.2.2 thorpej bad: 108 1.2.2.2 thorpej m_freem(m); 109 1.2.2.2 thorpej return(IPPROTO_DONE); 110 1.2.2.2 thorpej } 111
Indexes created Wed Oct 22 13:09:56 GMT 2025