266 lines
8.1 KiB
C
266 lines
8.1 KiB
C
/* $NetBSD: ip_etherip.c,v 1.14 2011/07/17 20:54:53 joerg 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: ip_etherip.c,v 1.14 2011/07/17 20:54:53 joerg Exp $");
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#include "opt_inet.h"
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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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#include <netinet/ip.h>
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#include <netinet/ip_var.h>
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#include <netinet/in_var.h>
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#include <netinet/ip_etherip.h>
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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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ip_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_in *sin_src, *sin_dst;
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struct ip iphdr; /* 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_in dst4;
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} u;
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sin_src = (struct sockaddr_in *)sc->sc_src;
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sin_dst = (struct sockaddr_in *)sc->sc_dst;
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if (sin_src == NULL ||
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sin_dst == NULL ||
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sin_src->sin_family != AF_INET ||
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sin_dst->sin_family != AF_INET) {
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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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/* fill new IP header */
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memset(&iphdr, 0, sizeof(struct ip));
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iphdr.ip_src = sin_src->sin_addr;
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/* bidirectional configured tunnel mode */
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if (sin_dst->sin_addr.s_addr != INADDR_ANY)
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iphdr.ip_dst = sin_dst->sin_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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iphdr.ip_p = proto;
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/* version will be set in ip_output() */
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iphdr.ip_ttl = ETHERIP_TTL;
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iphdr.ip_len = htons(m->m_pkthdr.len + sizeof(struct ip));
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/* prepend new IP header */
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M_PREPEND(m, sizeof(struct ip), 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 ip)))
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m = m_pullup(m, sizeof(struct ip));
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memcpy(mtod(m, struct ip *), &iphdr, sizeof(struct ip));
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sockaddr_in_init(&u.dst4, &sin_dst->sin_addr, 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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error = ip_output(m, NULL, &sc->sc_ro, 0, NULL, NULL);
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return error;
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}
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void
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ip_etherip_input(struct mbuf *m, ...)
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{
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struct etherip_softc *sc;
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const struct ip *ip;
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struct sockaddr_in *src, *dst;
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struct ifnet *ifp = NULL;
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int off, proto, s;
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va_list ap;
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va_start(ap, m);
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off = va_arg(ap, int);
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proto = va_arg(ap, int);
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va_end(ap);
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if (proto != IPPROTO_ETHERIP) {
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m_freem(m);
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ip_statinc(IP_STAT_NOPROTO);
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return;
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}
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ip = mtod(m, const struct ip *);
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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_INET ||
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sc->sc_dst->sa_family != AF_INET)
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continue;
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src = (struct sockaddr_in *)sc->sc_src;
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dst = (struct sockaddr_in *)sc->sc_dst;
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if (src->sin_addr.s_addr != ip->ip_dst.s_addr ||
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dst->sin_addr.s_addr != ip->ip_src.s_addr)
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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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ip_statinc(IP_STAT_ODROPPED);
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return;
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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;
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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;
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}
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