78678b130a
- most of the kernel code will not care about the actual encoding of
scope zone IDs and won't touch "s6_addr16[1]" directly.
- similarly, most of the kernel code will not care about link-local
scoped addresses as a special case.
- scope boundary check will be stricter. For example, the current
*BSD code allows a packet with src=::1 and dst=(some global IPv6
address) to be sent outside of the node, if the application do:
s = socket(AF_INET6);
bind(s, "::1");
sendto(s, some_global_IPv6_addr);
This is clearly wrong, since ::1 is only meaningful within a single
node, but the current implementation of the *BSD kernel cannot
reject this attempt.
- and, while there, don't try to remove the ff02::/32 interface route
entry in in6_ifdetach() as it's already gone.
This also includes some level of support for the standard source
address selection algorithm defined in RFC3484, which will be
completed on in the future.
From the KAME project via JINMEI Tatuya.
Approved by core@.
208 lines
5.9 KiB
C
208 lines
5.9 KiB
C
/* $NetBSD: route6.c,v 1.14 2006/01/21 00:15:37 rpaulo Exp $ */
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/* $KAME: route6.c,v 1.22 2000/12/03 00:54:00 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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__KERNEL_RCSID(0, "$NetBSD: route6.c,v 1.14 2006/01/21 00:15:37 rpaulo Exp $");
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#include <sys/param.h>
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#include <sys/mbuf.h>
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#include <sys/socket.h>
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#include <sys/systm.h>
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#include <sys/queue.h>
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#include <net/if.h>
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#include <netinet/in.h>
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#include <netinet6/in6_var.h>
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#include <netinet/ip6.h>
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#include <netinet6/ip6_var.h>
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#include <netinet6/scope6_var.h>
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#include <netinet/icmp6.h>
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static int ip6_rthdr0 __P((struct mbuf *, struct ip6_hdr *,
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struct ip6_rthdr0 *));
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int
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route6_input(mp, offp, proto)
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struct mbuf **mp;
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int *offp, proto; /* proto is unused */
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{
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struct ip6_hdr *ip6;
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struct mbuf *m = *mp;
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struct ip6_rthdr *rh;
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int off = *offp, rhlen;
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ip6 = mtod(m, struct ip6_hdr *);
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IP6_EXTHDR_GET(rh, struct ip6_rthdr *, m, off, sizeof(*rh));
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if (rh == NULL) {
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ip6stat.ip6s_tooshort++;
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return IPPROTO_DONE;
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}
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switch (rh->ip6r_type) {
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case IPV6_RTHDR_TYPE_0:
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rhlen = (rh->ip6r_len + 1) << 3;
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/*
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* note on option length:
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* maximum rhlen: 2048
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* max mbuf m_pulldown can handle: MCLBYTES == usually 2048
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* so, here we are assuming that m_pulldown can handle
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* rhlen == 2048 case. this may not be a good thing to
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* assume - we may want to avoid pulling it up altogether.
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*/
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IP6_EXTHDR_GET(rh, struct ip6_rthdr *, m, off, rhlen);
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if (rh == NULL) {
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ip6stat.ip6s_tooshort++;
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return IPPROTO_DONE;
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}
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if (ip6_rthdr0(m, ip6, (struct ip6_rthdr0 *)rh))
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return (IPPROTO_DONE);
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break;
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default:
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/* unknown routing type */
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if (rh->ip6r_segleft == 0) {
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rhlen = (rh->ip6r_len + 1) << 3;
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break; /* Final dst. Just ignore the header. */
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}
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ip6stat.ip6s_badoptions++;
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icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER,
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(caddr_t)&rh->ip6r_type - (caddr_t)ip6);
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return (IPPROTO_DONE);
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}
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*offp += rhlen;
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return (rh->ip6r_nxt);
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}
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/*
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* Type0 routing header processing
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*
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* RFC2292 backward compatibility warning: no support for strict/loose bitmap,
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* as it was dropped between RFC1883 and RFC2460.
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*/
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static int
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ip6_rthdr0(m, ip6, rh0)
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struct mbuf *m;
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struct ip6_hdr *ip6;
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struct ip6_rthdr0 *rh0;
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{
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int addrs, index;
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struct in6_addr *nextaddr, tmpaddr;
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struct in6_ifaddr *ifa;
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if (rh0->ip6r0_segleft == 0)
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return (0);
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if (rh0->ip6r0_len % 2
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#ifdef COMPAT_RFC1883
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|| rh0->ip6r0_len > 46
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#endif
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) {
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/*
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* Type 0 routing header can't contain more than 23 addresses.
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* RFC 2462: this limitation was removed since strict/loose
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* bitmap field was deleted.
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*/
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ip6stat.ip6s_badoptions++;
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icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER,
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(caddr_t)&rh0->ip6r0_len - (caddr_t)ip6);
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return (-1);
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}
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if ((addrs = rh0->ip6r0_len / 2) < rh0->ip6r0_segleft) {
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ip6stat.ip6s_badoptions++;
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icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER,
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(caddr_t)&rh0->ip6r0_segleft - (caddr_t)ip6);
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return (-1);
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}
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index = addrs - rh0->ip6r0_segleft;
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rh0->ip6r0_segleft--;
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nextaddr = ((struct in6_addr *)(rh0 + 1)) + index;
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/*
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* reject invalid addresses. be proactive about malicious use of
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* IPv4 mapped/compat address.
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* XXX need more checks?
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*/
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if (IN6_IS_ADDR_MULTICAST(nextaddr) ||
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IN6_IS_ADDR_UNSPECIFIED(nextaddr) ||
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IN6_IS_ADDR_V4MAPPED(nextaddr) ||
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IN6_IS_ADDR_V4COMPAT(nextaddr)) {
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ip6stat.ip6s_badoptions++;
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goto bad;
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}
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if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
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IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst) ||
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IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst) ||
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IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {
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ip6stat.ip6s_badoptions++;
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goto bad;
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}
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/*
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* Determine the scope zone of the next hop, based on the interface
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* of the current hop. [RFC4007, Section 9]
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* Then disambiguate the scope zone for the next hop (if necessary).
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*/
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if ((ifa = ip6_getdstifaddr(m)) == NULL)
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goto bad;
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if (in6_setscope(nextaddr, ifa->ia_ifp, NULL) != 0) {
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ip6stat.ip6s_badscope++;
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goto bad;
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}
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/*
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* Swap the IPv6 destination address and nextaddr. Forward the packet.
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*/
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tmpaddr = *nextaddr;
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*nextaddr = ip6->ip6_dst;
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in6_clearscope(nextaddr); /* XXX */
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ip6->ip6_dst = tmpaddr;
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#ifdef COMPAT_RFC1883
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if (rh0->ip6r0_slmap[index / 8] & (1 << (7 - (index % 8))))
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ip6_forward(m, IPV6_SRCRT_NEIGHBOR);
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else
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ip6_forward(m, IPV6_SRCRT_NOTNEIGHBOR);
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#else
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ip6_forward(m, 1);
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#endif
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return (-1); /* m would be freed in ip6_forward() */
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bad:
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m_freem(m);
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return (-1);
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}
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