xref: /freebsd/sys/netinet6/ip6_forward.c (revision bd1da0a002e9a43cfb5220835c7a42804d90dc56)

/*-
 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the project nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	$KAME: ip6_forward.c,v 1.69 2001/05/17 03:48:30 itojun Exp $
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

#include "opt_inet.h"
#include "opt_inet6.h"
#include "opt_ipfw.h"
#include "opt_ipsec.h"
#include "opt_ipstealth.h"

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/domain.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/errno.h>
#include <sys/time.h>
#include <sys/kernel.h>
#include <sys/syslog.h>

#include <net/if.h>
#include <net/if_var.h>
#include <net/netisr.h>
#include <net/route.h>
#include <net/pfil.h>

#include <netinet/in.h>
#include <netinet/in_var.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/ip_var.h>
#include <netinet6/in6_var.h>
#include <netinet/ip6.h>
#include <netinet6/ip6_var.h>
#include <netinet6/scope6_var.h>
#include <netinet/icmp6.h>
#include <netinet6/nd6.h>

#include <netinet/in_pcb.h>

#ifdef IPSEC
#include <netinet6/ip6_ipsec.h>
#include <netipsec/ipsec.h>
#include <netipsec/ipsec6.h>
#include <netipsec/key.h>
#endif /* IPSEC */

/*
 * Forward a packet.  If some error occurs return the sender
 * an icmp packet.  Note we can't always generate a meaningful
 * icmp message because icmp doesn't have a large enough repertoire
 * of codes and types.
 *
 * If not forwarding, just drop the packet.  This could be confusing
 * if ipforwarding was zero but some routing protocol was advancing
 * us as a gateway to somewhere.  However, we must let the routing
 * protocol deal with that.
 *
 */
void
ip6_forward(struct mbuf *m, int srcrt)
{
	struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
	struct sockaddr_in6 *dst = NULL;
	struct rtentry *rt = NULL;
	struct route_in6 rin6;
	int error, type = 0, code = 0;
	struct mbuf *mcopy = NULL;
	struct ifnet *origifp;	/* maybe unnecessary */
	u_int32_t inzone, outzone;
	struct in6_addr src_in6, dst_in6, odst;
#ifdef IPSEC
	struct secpolicy *sp = NULL;
#endif
#ifdef SCTP
	int sw_csum;
#endif
	struct m_tag *fwd_tag;
	char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];

	/*
	 * Do not forward packets to multicast destination (should be handled
	 * by ip6_mforward().
	 * Do not forward packets with unspecified source.  It was discussed
	 * in July 2000, on the ipngwg mailing list.
	 */
	if ((m->m_flags & (M_BCAST|M_MCAST)) != 0 ||
	    IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
	    IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) {
		IP6STAT_INC(ip6s_cantforward);
		/* XXX in6_ifstat_inc(rt->rt_ifp, ifs6_in_discard) */
		if (V_ip6_log_time + V_ip6_log_interval < time_uptime) {
			V_ip6_log_time = time_uptime;
			log(LOG_DEBUG,
			    "cannot forward "
			    "from %s to %s nxt %d received on %s\n",
			    ip6_sprintf(ip6bufs, &ip6->ip6_src),
			    ip6_sprintf(ip6bufd, &ip6->ip6_dst),
			    ip6->ip6_nxt,
			    if_name(m->m_pkthdr.rcvif));
		}
		m_freem(m);
		return;
	}
#ifdef IPSEC
	/*
	 * Check if this packet has an active SA and needs to be dropped
	 * instead of forwarded.
	 */
	if (ip6_ipsec_fwd(m) != 0) {
		IP6STAT_INC(ip6s_cantforward);
		m_freem(m);
		return;
	}
#endif /* IPSEC */

#ifdef IPSTEALTH
	if (!V_ip6stealth) {
#endif
	if (ip6->ip6_hlim <= IPV6_HLIMDEC) {
		/* XXX in6_ifstat_inc(rt->rt_ifp, ifs6_in_discard) */
		icmp6_error(m, ICMP6_TIME_EXCEEDED,
				ICMP6_TIME_EXCEED_TRANSIT, 0);
		return;
	}
	ip6->ip6_hlim -= IPV6_HLIMDEC;

#ifdef IPSTEALTH
	}
#endif

	/*
	 * Save at most ICMPV6_PLD_MAXLEN (= the min IPv6 MTU -
	 * size of IPv6 + ICMPv6 headers) bytes of the packet in case
	 * we need to generate an ICMP6 message to the src.
	 * Thanks to M_EXT, in most cases copy will not occur.
	 *
	 * It is important to save it before IPsec processing as IPsec
	 * processing may modify the mbuf.
	 */
	mcopy = m_copy(m, 0, imin(m->m_pkthdr.len, ICMPV6_PLD_MAXLEN));

#ifdef IPSEC
	/* get a security policy for this packet */
	sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_OUTBOUND, &error);
	if (sp == NULL) {
		IPSEC6STAT_INC(ips_out_inval);
		IP6STAT_INC(ip6s_cantforward);
		if (mcopy) {
#if 0
			/* XXX: what icmp ? */
#else
			m_freem(mcopy);
#endif
		}
		m_freem(m);
		return;
	}

	error = 0;

	/* check policy */
	switch (sp->policy) {
	case IPSEC_POLICY_DISCARD:
		/*
		 * This packet is just discarded.
		 */
		IPSEC6STAT_INC(ips_out_polvio);
		IP6STAT_INC(ip6s_cantforward);
		KEY_FREESP(&sp);
		if (mcopy) {
#if 0
			/* XXX: what icmp ? */
#else
			m_freem(mcopy);
#endif
		}
		m_freem(m);
		return;

	case IPSEC_POLICY_BYPASS:
	case IPSEC_POLICY_NONE:
		/* no need to do IPsec. */
		KEY_FREESP(&sp);
		goto skip_ipsec;

	case IPSEC_POLICY_IPSEC:
		if (sp->req == NULL) {
			/* XXX should be panic ? */
			printf("ip6_forward: No IPsec request specified.\n");
			IP6STAT_INC(ip6s_cantforward);
			KEY_FREESP(&sp);
			if (mcopy) {
#if 0
				/* XXX: what icmp ? */
#else
				m_freem(mcopy);
#endif
			}
			m_freem(m);
			return;
		}
		/* do IPsec */
		break;

	case IPSEC_POLICY_ENTRUST:
	default:
		/* should be panic ?? */
		printf("ip6_forward: Invalid policy found. %d\n", sp->policy);
		KEY_FREESP(&sp);
		goto skip_ipsec;
	}

    {
	struct ipsecrequest *isr = NULL;

	/*
	 * when the kernel forwards a packet, it is not proper to apply
	 * IPsec transport mode to the packet. This check avoid from this.
	 * at present, if there is even a transport mode SA request in the
	 * security policy, the kernel does not apply IPsec to the packet.
	 * this check is not enough because the following case is valid.
	 *      ipsec esp/tunnel/xxx-xxx/require esp/transport//require;
	 */
	for (isr = sp->req; isr; isr = isr->next) {
		if (isr->saidx.mode == IPSEC_MODE_ANY)
			goto doipsectunnel;
		if (isr->saidx.mode == IPSEC_MODE_TUNNEL)
			goto doipsectunnel;
	}

	/*
	 * if there's no need for tunnel mode IPsec, skip.
	 */
	if (!isr)
		goto skip_ipsec;

    doipsectunnel:
	/*
	 * All the extension headers will become inaccessible
	 * (since they can be encrypted).
	 * Don't panic, we need no more updates to extension headers
	 * on inner IPv6 packet (since they are now encapsulated).
	 *
	 * IPv6 [ESP|AH] IPv6 [extension headers] payload
	 */

	/*
	 * If we need to encapsulate the packet, do it here
	 * ipsec6_proces_packet will send the packet using ip6_output
	 */
	error = ipsec6_process_packet(m, sp->req);
	/* Release SP if an error occured */
	if (error != 0)
		KEY_FREESP(&sp);
	if (error == EJUSTRETURN) {
		/*
		 * We had a SP with a level of 'use' and no SA. We
		 * will just continue to process the packet without
		 * IPsec processing.
		 */
		error = 0;
		goto skip_ipsec;
	}

	if (error) {
		/* mbuf is already reclaimed in ipsec6_process_packet. */
		switch (error) {
		case EHOSTUNREACH:
		case ENETUNREACH:
		case EMSGSIZE:
		case ENOBUFS:
		case ENOMEM:
			break;
		default:
			printf("ip6_output (ipsec): error code %d\n", error);
			/* FALLTHROUGH */
		case ENOENT:
			/* don't show these error codes to the user */
			break;
		}
		IP6STAT_INC(ip6s_cantforward);
		if (mcopy) {
#if 0
			/* XXX: what icmp ? */
#else
			m_freem(mcopy);
#endif
		}
		return;
	} else {
		/*
		 * In the FAST IPSec case we have already
		 * re-injected the packet and it has been freed
		 * by the ipsec_done() function.  So, just clean
		 * up after ourselves.
		 */
		m = NULL;
		goto freecopy;
	}
    }
skip_ipsec:
#endif
again:
	bzero(&rin6, sizeof(struct route_in6));
	dst = (struct sockaddr_in6 *)&rin6.ro_dst;
	dst->sin6_len = sizeof(struct sockaddr_in6);
	dst->sin6_family = AF_INET6;
	dst->sin6_addr = ip6->ip6_dst;
again2:
	rin6.ro_rt = in6_rtalloc1((struct sockaddr *)dst, 0, 0, M_GETFIB(m));
	if (rin6.ro_rt != NULL)
		RT_UNLOCK(rin6.ro_rt);
	else {
		IP6STAT_INC(ip6s_noroute);
		in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_noroute);
		if (mcopy) {
			icmp6_error(mcopy, ICMP6_DST_UNREACH,
			ICMP6_DST_UNREACH_NOROUTE, 0);
		}
		goto bad;
	}
	rt = rin6.ro_rt;

	/*
	 * Source scope check: if a packet can't be delivered to its
	 * destination for the reason that the destination is beyond the scope
	 * of the source address, discard the packet and return an icmp6
	 * destination unreachable error with Code 2 (beyond scope of source
	 * address).  We use a local copy of ip6_src, since in6_setscope()
	 * will possibly modify its first argument.
	 * [draft-ietf-ipngwg-icmp-v3-04.txt, Section 3.1]
	 */
	src_in6 = ip6->ip6_src;
	if (in6_setscope(&src_in6, rt->rt_ifp, &outzone)) {
		/* XXX: this should not happen */
		IP6STAT_INC(ip6s_cantforward);
		IP6STAT_INC(ip6s_badscope);
		goto bad;
	}
	if (in6_setscope(&src_in6, m->m_pkthdr.rcvif, &inzone)) {
		IP6STAT_INC(ip6s_cantforward);
		IP6STAT_INC(ip6s_badscope);
		goto bad;
	}
	if (inzone != outzone) {
		IP6STAT_INC(ip6s_cantforward);
		IP6STAT_INC(ip6s_badscope);
		in6_ifstat_inc(rt->rt_ifp, ifs6_in_discard);

		if (V_ip6_log_time + V_ip6_log_interval < time_uptime) {
			V_ip6_log_time = time_uptime;
			log(LOG_DEBUG,
			    "cannot forward "
			    "src %s, dst %s, nxt %d, rcvif %s, outif %s\n",
			    ip6_sprintf(ip6bufs, &ip6->ip6_src),
			    ip6_sprintf(ip6bufd, &ip6->ip6_dst),
			    ip6->ip6_nxt,
			    if_name(m->m_pkthdr.rcvif), if_name(rt->rt_ifp));
		}
		if (mcopy)
			icmp6_error(mcopy, ICMP6_DST_UNREACH,
				    ICMP6_DST_UNREACH_BEYONDSCOPE, 0);
		goto bad;
	}

	/*
	 * Destination scope check: if a packet is going to break the scope
	 * zone of packet's destination address, discard it.  This case should
	 * usually be prevented by appropriately-configured routing table, but
	 * we need an explicit check because we may mistakenly forward the
	 * packet to a different zone by (e.g.) a default route.
	 */
	dst_in6 = ip6->ip6_dst;
	if (in6_setscope(&dst_in6, m->m_pkthdr.rcvif, &inzone) != 0 ||
	    in6_setscope(&dst_in6, rt->rt_ifp, &outzone) != 0 ||
	    inzone != outzone) {
		IP6STAT_INC(ip6s_cantforward);
		IP6STAT_INC(ip6s_badscope);
		goto bad;
	}

	if (rt->rt_flags & RTF_GATEWAY)
		dst = (struct sockaddr_in6 *)rt->rt_gateway;

	/*
	 * If we are to forward the packet using the same interface
	 * as one we got the packet from, perhaps we should send a redirect
	 * to sender to shortcut a hop.
	 * Only send redirect if source is sending directly to us,
	 * and if packet was not source routed (or has any options).
	 * Also, don't send redirect if forwarding using a route
	 * modified by a redirect.
	 */
	if (V_ip6_sendredirects && rt->rt_ifp == m->m_pkthdr.rcvif && !srcrt &&
	    (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0) {
		if ((rt->rt_ifp->if_flags & IFF_POINTOPOINT) != 0) {
			/*
			 * If the incoming interface is equal to the outgoing
			 * one, and the link attached to the interface is
			 * point-to-point, then it will be highly probable
			 * that a routing loop occurs. Thus, we immediately
			 * drop the packet and send an ICMPv6 error message.
			 *
			 * type/code is based on suggestion by Rich Draves.
			 * not sure if it is the best pick.
			 */
			icmp6_error(mcopy, ICMP6_DST_UNREACH,
				    ICMP6_DST_UNREACH_ADDR, 0);
			goto bad;
		}
		type = ND_REDIRECT;
	}

	/*
	 * Fake scoped addresses. Note that even link-local source or
	 * destinaion can appear, if the originating node just sends the
	 * packet to us (without address resolution for the destination).
	 * Since both icmp6_error and icmp6_redirect_output fill the embedded
	 * link identifiers, we can do this stuff after making a copy for
	 * returning an error.
	 */
	if ((rt->rt_ifp->if_flags & IFF_LOOPBACK) != 0) {
		/*
		 * See corresponding comments in ip6_output.
		 * XXX: but is it possible that ip6_forward() sends a packet
		 *      to a loopback interface? I don't think so, and thus
		 *      I bark here. (jinmei@kame.net)
		 * XXX: it is common to route invalid packets to loopback.
		 *	also, the codepath will be visited on use of ::1 in
		 *	rthdr. (itojun)
		 */
#if 1
		if (0)
#else
		if ((rt->rt_flags & (RTF_BLACKHOLE|RTF_REJECT)) == 0)
#endif
		{
			printf("ip6_forward: outgoing interface is loopback. "
			       "src %s, dst %s, nxt %d, rcvif %s, outif %s\n",
			       ip6_sprintf(ip6bufs, &ip6->ip6_src),
			       ip6_sprintf(ip6bufd, &ip6->ip6_dst),
			       ip6->ip6_nxt, if_name(m->m_pkthdr.rcvif),
			       if_name(rt->rt_ifp));
		}

		/* we can just use rcvif in forwarding. */
		origifp = m->m_pkthdr.rcvif;
	}
	else
		origifp = rt->rt_ifp;
	/*
	 * clear embedded scope identifiers if necessary.
	 * in6_clearscope will touch the addresses only when necessary.
	 */
	in6_clearscope(&ip6->ip6_src);
	in6_clearscope(&ip6->ip6_dst);

	/* Jump over all PFIL processing if hooks are not active. */
	if (!PFIL_HOOKED(&V_inet6_pfil_hook))
		goto pass;

	odst = ip6->ip6_dst;
	/* Run through list of hooks for output packets. */
	error = pfil_run_hooks(&V_inet6_pfil_hook, &m, rt->rt_ifp, PFIL_OUT, NULL);
	if (error != 0 || m == NULL)
		goto freecopy;		/* consumed by filter */
	ip6 = mtod(m, struct ip6_hdr *);

	/* See if destination IP address was changed by packet filter. */
	if (!IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst)) {
		m->m_flags |= M_SKIP_FIREWALL;
		/* If destination is now ourself drop to ip6_input(). */
		if (in6_localip(&ip6->ip6_dst))
			m->m_flags |= M_FASTFWD_OURS;
		else
			goto again;	/* Redo the routing table lookup. */
	}

	/* See if local, if yes, send it to netisr. */
	if (m->m_flags & M_FASTFWD_OURS) {
		if (m->m_pkthdr.rcvif == NULL)
			m->m_pkthdr.rcvif = V_loif;
		if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) {
			m->m_pkthdr.csum_flags |=
			    CSUM_DATA_VALID_IPV6 | CSUM_PSEUDO_HDR;
			m->m_pkthdr.csum_data = 0xffff;
		}
#ifdef SCTP
		if (m->m_pkthdr.csum_flags & CSUM_SCTP_IPV6)
			m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID;
#endif
		error = netisr_queue(NETISR_IPV6, m);
		goto out;
	}
	/* Or forward to some other address? */
	if ((m->m_flags & M_IP6_NEXTHOP) &&
	    (fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL) {
		dst = (struct sockaddr_in6 *)&rin6.ro_dst;
		bcopy((fwd_tag+1), dst, sizeof(struct sockaddr_in6));
		m->m_flags |= M_SKIP_FIREWALL;
		m->m_flags &= ~M_IP6_NEXTHOP;
		m_tag_delete(m, fwd_tag);
		goto again2;
	}

pass:
	/* See if the size was changed by the packet filter. */
	if (m->m_pkthdr.len > IN6_LINKMTU(rt->rt_ifp)) {
		in6_ifstat_inc(rt->rt_ifp, ifs6_in_toobig);
		if (mcopy) {
			u_long mtu;
#ifdef IPSEC
			size_t ipsechdrsiz;
#endif /* IPSEC */

			mtu = IN6_LINKMTU(rt->rt_ifp);
#ifdef IPSEC
			/*
			 * When we do IPsec tunnel ingress, we need to play
			 * with the link value (decrement IPsec header size
			 * from mtu value).  The code is much simpler than v4
			 * case, as we have the outgoing interface for
			 * encapsulated packet as "rt->rt_ifp".
			 */
			ipsechdrsiz = ipsec_hdrsiz(mcopy, IPSEC_DIR_OUTBOUND,
			    NULL);
			if (ipsechdrsiz < mtu)
				mtu -= ipsechdrsiz;
			/*
			 * if mtu becomes less than minimum MTU,
			 * tell minimum MTU (and I'll need to fragment it).
			 */
			if (mtu < IPV6_MMTU)
				mtu = IPV6_MMTU;
#endif /* IPSEC */
			icmp6_error(mcopy, ICMP6_PACKET_TOO_BIG, 0, mtu);
		}
		goto bad;
	}

	error = nd6_output(rt->rt_ifp, origifp, m, dst, rt);
	if (error) {
		in6_ifstat_inc(rt->rt_ifp, ifs6_out_discard);
		IP6STAT_INC(ip6s_cantforward);
	} else {
		IP6STAT_INC(ip6s_forward);
		in6_ifstat_inc(rt->rt_ifp, ifs6_out_forward);
		if (type)
			IP6STAT_INC(ip6s_redirectsent);
		else {
			if (mcopy)
				goto freecopy;
		}
	}

	if (mcopy == NULL)
		goto out;
	switch (error) {
	case 0:
		if (type == ND_REDIRECT) {
			icmp6_redirect_output(mcopy, rt);
			goto out;
		}
		goto freecopy;

	case EMSGSIZE:
		/* xxx MTU is constant in PPP? */
		goto freecopy;

	case ENOBUFS:
		/* Tell source to slow down like source quench in IP? */
		goto freecopy;

	case ENETUNREACH:	/* shouldn't happen, checked above */
	case EHOSTUNREACH:
	case ENETDOWN:
	case EHOSTDOWN:
	default:
		type = ICMP6_DST_UNREACH;
		code = ICMP6_DST_UNREACH_ADDR;
		break;
	}
	icmp6_error(mcopy, type, code, 0);
	goto out;

 freecopy:
	m_freem(mcopy);
	goto out;
bad:
	m_freem(m);
out:
	if (rt != NULL)
		RTFREE(rt);
}