272 lines
8.4 KiB
C
272 lines
8.4 KiB
C
/* $NetBSD: ip6_etherip.c,v 1.16 2015/08/24 22:21:27 pooka Exp $ */
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/*
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* Copyright (c) 2006, Hans Rosenfeld <rosenfeld@grumpf.hope-2000.org>
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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 Hans Rosenfeld nor the names of his
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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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*
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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: ip6_etherip.c,v 1.16 2015/08/24 22:21:27 pooka Exp $");
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#ifdef _KERNEL_OPT
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#include "opt_inet.h"
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#endif
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/socket.h>
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#include <sys/sockio.h>
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#include <sys/mbuf.h>
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#include <sys/device.h>
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#include <sys/errno.h>
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#include <sys/ioctl.h>
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#include <sys/syslog.h>
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#include <sys/protosw.h>
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#include <sys/kernel.h>
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#include <net/if.h>
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#include <net/route.h>
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#ifdef INET
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#include <netinet/ip.h>
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#endif
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#ifdef INET6
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#include <netinet/ip6.h>
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#include <netinet6/ip6_var.h>
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#include <netinet6/ip6_private.h>
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#include <netinet6/in6_var.h>
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#include <netinet6/ip6_etherip.h>
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#endif
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#include <net/if_ether.h>
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#include <net/if_media.h>
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#include <net/if_etherip.h>
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#include <net/bpf.h>
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int
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ip6_etherip_output(struct ifnet *ifp, struct mbuf *m)
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{
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struct rtentry *rt;
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struct etherip_softc *sc = (struct etherip_softc *)ifp->if_softc;
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struct sockaddr_in6 *sin6_src, *sin6_dst;
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struct ip6_hdr *ip6; /* capsule IP header, host byte ordered */
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struct etherip_header eiphdr;
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int proto, error;
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union {
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struct sockaddr dst;
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struct sockaddr_in6 dst6;
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} u;
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sin6_src = (struct sockaddr_in6 *)sc->sc_src;
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sin6_dst = (struct sockaddr_in6 *)sc->sc_dst;
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if (sin6_src == NULL ||
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sin6_dst == NULL ||
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sin6_src->sin6_family != AF_INET6 ||
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sin6_dst->sin6_family != AF_INET6) {
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m_freem(m);
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return EAFNOSUPPORT;
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}
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/* reset broadcast/multicast flags */
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m->m_flags &= ~(M_BCAST|M_MCAST);
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m->m_flags |= M_PKTHDR;
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proto = IPPROTO_ETHERIP;
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/* fill and prepend Ethernet-in-IP header */
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eiphdr.eip_ver = ETHERIP_VERSION & ETHERIP_VER_VERS_MASK;
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eiphdr.eip_pad = 0;
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M_PREPEND(m, sizeof(struct etherip_header), M_DONTWAIT);
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if (m == NULL)
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return ENOBUFS;
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if (M_UNWRITABLE(m, sizeof(struct etherip_header))) {
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m = m_pullup(m, sizeof(struct etherip_header));
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if (m == NULL)
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return ENOBUFS;
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}
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memcpy(mtod(m, struct etherip_header *), &eiphdr,
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sizeof(struct etherip_header));
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/* prepend new IP header */
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M_PREPEND(m, sizeof(struct ip6_hdr), M_DONTWAIT);
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if (m && m->m_len < sizeof(struct ip6_hdr))
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m = m_pullup(m, sizeof(struct ip6_hdr));
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if (m == NULL)
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return ENOBUFS;
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ip6 = mtod(m, struct ip6_hdr *);
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ip6->ip6_flow = 0;
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ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
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ip6->ip6_vfc |= IPV6_VERSION;
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ip6->ip6_nxt = proto;
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ip6->ip6_hlim = ETHERIP_TTL;
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ip6->ip6_src = sin6_src->sin6_addr;
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/* bidirectional configured tunnel mode */
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if (!IN6_IS_ADDR_UNSPECIFIED(&sin6_dst->sin6_addr))
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ip6->ip6_dst = sin6_dst->sin6_addr;
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else {
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m_freem(m);
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return ENETUNREACH;
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}
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sockaddr_in6_init(&u.dst6, &sin6_dst->sin6_addr, 0, 0, 0);
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if ((rt = rtcache_lookup(&sc->sc_ro, &u.dst)) == NULL) {
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m_freem(m);
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return ENETUNREACH;
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}
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/* if it constitutes infinite encapsulation, punt. */
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if (rt->rt_ifp == ifp) {
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rtcache_free(&sc->sc_ro);
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m_freem(m);
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return ENETUNREACH; /* XXX */
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}
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/*
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* force fragmentation to minimum MTU, to avoid path MTU discovery.
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* it is too painful to ask for resend of inner packet, to achieve
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* path MTU discovery for encapsulated packets.
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*/
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error = ip6_output(m, 0, &sc->sc_ro, IPV6_MINMTU, NULL, NULL, NULL);
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return error;
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}
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int
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ip6_etherip_input(struct mbuf **mp, int *offp, int proto)
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{
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struct mbuf *m = *mp;
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int off = *offp;
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struct etherip_softc *sc;
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const struct ip6_hdr *ip6;
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struct sockaddr_in6 *src6, *dst6;
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struct ifnet *ifp = NULL;
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int s;
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if (proto != IPPROTO_ETHERIP) {
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m_freem(m);
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IP6_STATINC(IP6_STAT_NOGIF);
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return IPPROTO_DONE;
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}
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ip6 = mtod(m, const struct ip6_hdr *);
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/* find device configured for this packets src and dst */
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LIST_FOREACH(sc, ðerip_softc_list, etherip_list) {
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if( !sc->sc_src || !sc->sc_dst)
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continue;
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if (sc->sc_src->sa_family != AF_INET6 ||
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sc->sc_dst->sa_family != AF_INET6)
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continue;
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src6 = (struct sockaddr_in6 *)sc->sc_src;
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dst6 = (struct sockaddr_in6 *)sc->sc_dst;
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if (!IN6_ARE_ADDR_EQUAL(&src6->sin6_addr, &ip6->ip6_dst) ||
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!IN6_ARE_ADDR_EQUAL(&dst6->sin6_addr, &ip6->ip6_src))
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continue;
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ifp = &sc->sc_ec.ec_if;
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break;
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}
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/* no matching device found */
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if (!ifp) {
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m_freem(m);
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IP6_STATINC(IP6_STAT_ODROPPED);
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return IPPROTO_DONE;
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}
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m_adj(m, off);
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/*
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* Section 4 of RFC 3378 requires that the EtherIP header of incoming
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* packets is verified to contain the correct values in the version and
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* reserved fields, and packets with wrong values be dropped.
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*
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* There is some discussion about what exactly the header should look
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* like, the RFC is not very clear there. To be compatible with broken
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* implementations, we don't check the header on incoming packets,
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* relying on the ethernet code to filter out garbage.
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*
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* The header we use for sending is compatible with the original
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* implementation in OpenBSD, which was used in former NetBSD versions
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* and is used in FreeBSD. One Linux implementation is known to use the
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* same value.
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*/
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m_adj(m, sizeof(struct etherip_header));
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m = m_pullup(m, sizeof(struct ether_header));
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if (m == NULL) {
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ifp->if_ierrors++;
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return IPPROTO_DONE;
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}
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m->m_pkthdr.rcvif = ifp;
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m->m_flags &= ~(M_BCAST|M_MCAST);
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bpf_mtap(ifp, m);
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ifp->if_ipackets++;
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s = splnet();
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(ifp->if_input)(ifp, m);
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splx(s);
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return IPPROTO_DONE;
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}
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