436 lines
9.7 KiB
C
436 lines
9.7 KiB
C
/* $KAME: rthdr.c,v 1.19 2003/06/06 10:48:51 itojun Exp $ */
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/*
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* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the project nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <netinet/ip6.h>
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#include <string.h>
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#include <stdio.h>
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/*
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* RFC2292 API
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*/
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size_t
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inet6_rthdr_space(int type, int seg)
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{
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switch (type) {
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case IPV6_RTHDR_TYPE_0:
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if (seg < 1 || seg > 23)
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return (0);
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#ifdef COMPAT_RFC2292
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return (CMSG_SPACE(sizeof(struct in6_addr) * (seg - 1) +
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sizeof(struct ip6_rthdr0)));
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#else
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return (CMSG_SPACE(sizeof(struct in6_addr) * seg +
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sizeof(struct ip6_rthdr0)));
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#endif
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default:
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return (0);
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}
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}
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struct cmsghdr *
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inet6_rthdr_init(void *bp, int type)
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{
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struct cmsghdr *ch = (struct cmsghdr *)bp;
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struct ip6_rthdr *rthdr;
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rthdr = (struct ip6_rthdr *)CMSG_DATA(ch);
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ch->cmsg_level = IPPROTO_IPV6;
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ch->cmsg_type = IPV6_RTHDR;
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switch (type) {
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case IPV6_RTHDR_TYPE_0:
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#ifdef COMPAT_RFC2292
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ch->cmsg_len = CMSG_LEN(sizeof(struct ip6_rthdr0) -
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sizeof(struct in6_addr));
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#else
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ch->cmsg_len = CMSG_LEN(sizeof(struct ip6_rthdr0));
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#endif
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bzero(rthdr, sizeof(struct ip6_rthdr0));
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rthdr->ip6r_type = IPV6_RTHDR_TYPE_0;
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return (ch);
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default:
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return (NULL);
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}
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}
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/* ARGSUSED */
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int
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inet6_rthdr_add(struct cmsghdr *cmsg, const struct in6_addr *addr, u_int flags)
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{
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struct ip6_rthdr *rthdr;
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rthdr = (struct ip6_rthdr *)CMSG_DATA(cmsg);
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switch (rthdr->ip6r_type) {
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case IPV6_RTHDR_TYPE_0:
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{
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struct ip6_rthdr0 *rt0 = (struct ip6_rthdr0 *)rthdr;
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if (flags != IPV6_RTHDR_LOOSE && flags != IPV6_RTHDR_STRICT)
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return (-1);
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if (rt0->ip6r0_segleft == 23)
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return (-1);
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#ifdef COMPAT_RFC1883 /* XXX */
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if (flags == IPV6_RTHDR_STRICT) {
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int c, b;
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c = rt0->ip6r0_segleft / 8;
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b = rt0->ip6r0_segleft % 8;
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rt0->ip6r0_slmap[c] |= (1 << (7 - b));
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}
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#else
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if (flags != IPV6_RTHDR_LOOSE)
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return (-1);
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#endif
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rt0->ip6r0_segleft++;
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bcopy(addr, (caddr_t)rt0 + ((rt0->ip6r0_len + 1) << 3),
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sizeof(struct in6_addr));
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rt0->ip6r0_len += sizeof(struct in6_addr) >> 3;
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cmsg->cmsg_len = CMSG_LEN((rt0->ip6r0_len + 1) << 3);
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break;
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}
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default:
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return (-1);
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}
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return (0);
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}
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/* ARGSUSED */
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int
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inet6_rthdr_lasthop(struct cmsghdr *cmsg, unsigned int flags)
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{
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struct ip6_rthdr *rthdr;
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rthdr = (struct ip6_rthdr *)CMSG_DATA(cmsg);
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switch (rthdr->ip6r_type) {
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case IPV6_RTHDR_TYPE_0:
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{
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struct ip6_rthdr0 *rt0 = (struct ip6_rthdr0 *)rthdr;
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#ifdef COMPAT_RFC1883 /* XXX */
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if (flags != IPV6_RTHDR_LOOSE && flags != IPV6_RTHDR_STRICT)
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return (-1);
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#endif /* COMPAT_RFC1883 */
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if (rt0->ip6r0_segleft > 23)
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return (-1);
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#ifdef COMPAT_RFC1883 /* XXX */
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if (flags == IPV6_RTHDR_STRICT) {
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int c, b;
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c = rt0->ip6r0_segleft / 8;
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b = rt0->ip6r0_segleft % 8;
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rt0->ip6r0_slmap[c] |= (1 << (7 - b));
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}
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#else
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if (flags != IPV6_RTHDR_LOOSE)
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return (-1);
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#endif /* COMPAT_RFC1883 */
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break;
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}
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default:
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return (-1);
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}
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return (0);
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}
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#if 0
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int
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inet6_rthdr_reverse(const struct cmsghdr *in, struct cmsghdr *out)
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{
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return (-1);
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}
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#endif
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int
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inet6_rthdr_segments(const struct cmsghdr *cmsg)
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{
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struct ip6_rthdr *rthdr;
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rthdr = (struct ip6_rthdr *)CMSG_DATA(cmsg);
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switch (rthdr->ip6r_type) {
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case IPV6_RTHDR_TYPE_0:
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{
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struct ip6_rthdr0 *rt0 = (struct ip6_rthdr0 *)rthdr;
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if (rt0->ip6r0_len % 2 || 46 < rt0->ip6r0_len)
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return (-1);
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return (rt0->ip6r0_len * 8) / sizeof(struct in6_addr);
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}
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default:
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return (-1);
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}
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}
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struct in6_addr *
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inet6_rthdr_getaddr(struct cmsghdr *cmsg, int idx)
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{
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struct ip6_rthdr *rthdr;
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rthdr = (struct ip6_rthdr *)CMSG_DATA(cmsg);
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switch (rthdr->ip6r_type) {
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case IPV6_RTHDR_TYPE_0:
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{
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struct ip6_rthdr0 *rt0 = (struct ip6_rthdr0 *)rthdr;
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int naddr;
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if (rt0->ip6r0_len % 2 || 46 < rt0->ip6r0_len)
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return NULL;
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naddr = (rt0->ip6r0_len * 8) / sizeof(struct in6_addr);
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if (idx <= 0 || naddr < idx)
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return NULL;
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#ifdef COMPAT_RFC2292
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return (((struct in6_addr *)(rt0 + 1)) + idx - 1);
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#else
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return (((struct in6_addr *)(rt0 + 1)) + idx);
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#endif
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}
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default:
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return NULL;
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}
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}
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int
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inet6_rthdr_getflags(const struct cmsghdr *cmsg, int idx)
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{
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struct ip6_rthdr *rthdr;
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rthdr = (struct ip6_rthdr *)CMSG_DATA(cmsg);
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switch (rthdr->ip6r_type) {
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case IPV6_RTHDR_TYPE_0:
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{
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struct ip6_rthdr0 *rt0 = (struct ip6_rthdr0 *)rthdr;
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int naddr;
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if (rt0->ip6r0_len % 2 || 46 < rt0->ip6r0_len)
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return (-1);
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naddr = (rt0->ip6r0_len * 8) / sizeof(struct in6_addr);
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if (idx < 0 || naddr < idx)
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return (-1);
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#ifdef COMPAT_RFC1883 /* XXX */
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if (rt0->ip6r0_slmap[idx / 8] & (0x80 >> (idx % 8)))
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return IPV6_RTHDR_STRICT;
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else
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return IPV6_RTHDR_LOOSE;
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#else
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return IPV6_RTHDR_LOOSE;
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#endif /* COMPAT_RFC1883 */
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}
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default:
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return (-1);
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}
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}
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/*
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* RFC3542 API
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*/
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socklen_t
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inet6_rth_space(int type, int segments)
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{
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switch (type) {
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case IPV6_RTHDR_TYPE_0:
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if ((segments >= 0) && (segments <= 127))
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return (((segments * 2) + 1) << 3);
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/* FALLTHROUGH */
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default:
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return (0); /* type not suppported */
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}
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}
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void *
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inet6_rth_init(void *bp, socklen_t bp_len, int type, int segments)
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{
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struct ip6_rthdr *rth = (struct ip6_rthdr *)bp;
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struct ip6_rthdr0 *rth0;
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switch (type) {
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case IPV6_RTHDR_TYPE_0:
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/* length validation */
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if (bp_len < inet6_rth_space(IPV6_RTHDR_TYPE_0, segments))
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return (NULL);
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/* segment validation */
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if ((segments < 0) || (segments > 127))
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return (NULL);
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memset(bp, 0, bp_len);
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rth0 = (struct ip6_rthdr0 *)rth;
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rth0->ip6r0_len = segments * 2;
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rth0->ip6r0_type = IPV6_RTHDR_TYPE_0;
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rth0->ip6r0_segleft = 0;
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rth0->ip6r0_reserved = 0;
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break;
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default:
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return (NULL); /* type not supported */
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}
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return (bp);
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}
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int
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inet6_rth_add(void *bp, const struct in6_addr *addr)
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{
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struct ip6_rthdr *rth = (struct ip6_rthdr *)bp;
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struct ip6_rthdr0 *rth0;
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struct in6_addr *nextaddr;
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switch (rth->ip6r_type) {
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case IPV6_RTHDR_TYPE_0:
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rth0 = (struct ip6_rthdr0 *)rth;
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/* Don't exceed the number of stated segments */
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if (rth0->ip6r0_segleft == (rth0->ip6r0_len / 2))
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return (-1);
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nextaddr = (struct in6_addr *)(rth0 + 1) + rth0->ip6r0_segleft;
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*nextaddr = *addr;
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rth0->ip6r0_segleft++;
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break;
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default:
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return (-1); /* type not supported */
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}
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return (0);
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}
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int
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inet6_rth_reverse(const void *in, void *out)
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{
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struct ip6_rthdr *rth_in = (struct ip6_rthdr *)in;
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struct ip6_rthdr0 *rth0_in, *rth0_out;
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int i, segments;
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switch (rth_in->ip6r_type) {
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case IPV6_RTHDR_TYPE_0:
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rth0_in = (struct ip6_rthdr0 *)in;
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rth0_out = (struct ip6_rthdr0 *)out;
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/* parameter validation XXX too paranoid? */
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if (rth0_in->ip6r0_len % 2)
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return (-1);
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segments = rth0_in->ip6r0_len / 2;
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/* we can't use memcpy here, since in and out may overlap */
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memmove((void *)rth0_out, (void *)rth0_in,
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((rth0_in->ip6r0_len) + 1) << 3);
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rth0_out->ip6r0_segleft = segments;
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/* reverse the addresses */
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for (i = 0; i < segments / 2; i++) {
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struct in6_addr addr_tmp, *addr1, *addr2;
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addr1 = (struct in6_addr *)(rth0_out + 1) + i;
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addr2 = (struct in6_addr *)(rth0_out + 1) +
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(segments - i - 1);
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addr_tmp = *addr1;
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*addr1 = *addr2;
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*addr2 = addr_tmp;
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}
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break;
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default:
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return (-1); /* type not supported */
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}
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return (0);
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}
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int
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inet6_rth_segments(const void *bp)
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{
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struct ip6_rthdr *rh = (struct ip6_rthdr *)bp;
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struct ip6_rthdr0 *rh0;
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int addrs;
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switch (rh->ip6r_type) {
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case IPV6_RTHDR_TYPE_0:
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rh0 = (struct ip6_rthdr0 *)bp;
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/*
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* Validation for a type-0 routing header.
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* Is this too strict?
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*/
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if ((rh0->ip6r0_len % 2) != 0 ||
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(addrs = (rh0->ip6r0_len >> 1)) < rh0->ip6r0_segleft)
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return (-1);
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return (addrs);
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default:
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return (-1); /* unknown type */
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}
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}
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struct in6_addr *
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inet6_rth_getaddr(const void *bp, int idx)
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{
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struct ip6_rthdr *rh = (struct ip6_rthdr *)bp;
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struct ip6_rthdr0 *rh0;
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int addrs;
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switch (rh->ip6r_type) {
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case IPV6_RTHDR_TYPE_0:
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rh0 = (struct ip6_rthdr0 *)bp;
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/*
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* Validation for a type-0 routing header.
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* Is this too strict?
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*/
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if ((rh0->ip6r0_len % 2) != 0 ||
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(addrs = (rh0->ip6r0_len >> 1)) < rh0->ip6r0_segleft)
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return (NULL);
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if (idx < 0 || addrs <= idx)
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return (NULL);
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return (((struct in6_addr *)(rh0 + 1)) + idx);
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default:
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return (NULL); /* unknown type */
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break;
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}
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}
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