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-rw-r--r--sys/netinet6/in6_gif.c398
1 files changed, 398 insertions, 0 deletions
diff --git a/sys/netinet6/in6_gif.c b/sys/netinet6/in6_gif.c
new file mode 100644
index 0000000..b560075
--- /dev/null
+++ b/sys/netinet6/in6_gif.c
@@ -0,0 +1,398 @@
+/* $FreeBSD$ */
+/* $KAME: in6_gif.c,v 1.49 2001/05/14 14:02:17 itojun Exp $ */
+
+/*
+ * 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.
+ */
+
+#include "opt_inet.h"
+#include "opt_inet6.h"
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/socket.h>
+#include <sys/sockio.h>
+#include <sys/mbuf.h>
+#include <sys/errno.h>
+#include <sys/queue.h>
+#include <sys/syslog.h>
+#include <sys/protosw.h>
+
+#include <sys/malloc.h>
+
+#include <net/if.h>
+#include <net/route.h>
+
+#include <netinet/in.h>
+#include <netinet/in_systm.h>
+#ifdef INET
+#include <netinet/ip.h>
+#endif
+#include <netinet/ip_encap.h>
+#ifdef INET6
+#include <netinet/ip6.h>
+#include <netinet6/ip6_var.h>
+#include <netinet6/in6_gif.h>
+#include <netinet6/in6_var.h>
+#endif
+#include <netinet6/ip6protosw.h>
+#include <netinet/ip_ecn.h>
+#ifdef INET6
+#include <netinet6/ip6_ecn.h>
+#endif
+
+#include <net/if_gif.h>
+
+#include <net/net_osdep.h>
+
+static int gif_validate6(const struct ip6_hdr *, struct gif_softc *,
+ struct ifnet *);
+
+extern struct domain inet6domain;
+struct ip6protosw in6_gif_protosw =
+{ SOCK_RAW, &inet6domain, 0/*IPPROTO_IPV[46]*/, PR_ATOMIC|PR_ADDR,
+ in6_gif_input, rip6_output, 0, rip6_ctloutput,
+ 0,
+ 0, 0, 0, 0,
+ &rip6_usrreqs
+};
+
+int
+in6_gif_output(ifp, family, m)
+ struct ifnet *ifp;
+ int family; /* family of the packet to be encapsulate. */
+ struct mbuf *m;
+{
+ struct gif_softc *sc = (struct gif_softc*)ifp;
+ struct sockaddr_in6 *dst = (struct sockaddr_in6 *)&sc->gif_ro6.ro_dst;
+ struct sockaddr_in6 *sin6_src = (struct sockaddr_in6 *)sc->gif_psrc;
+ struct sockaddr_in6 *sin6_dst = (struct sockaddr_in6 *)sc->gif_pdst;
+ struct ip6_hdr *ip6;
+ int proto;
+ u_int8_t itos, otos;
+
+ if (sin6_src == NULL || sin6_dst == NULL ||
+ sin6_src->sin6_family != AF_INET6 ||
+ sin6_dst->sin6_family != AF_INET6) {
+ m_freem(m);
+ return EAFNOSUPPORT;
+ }
+
+ switch (family) {
+#ifdef INET
+ case AF_INET:
+ {
+ struct ip *ip;
+
+ proto = IPPROTO_IPV4;
+ if (m->m_len < sizeof(*ip)) {
+ m = m_pullup(m, sizeof(*ip));
+ if (!m)
+ return ENOBUFS;
+ }
+ ip = mtod(m, struct ip *);
+ itos = ip->ip_tos;
+ break;
+ }
+#endif
+#ifdef INET6
+ case AF_INET6:
+ {
+ struct ip6_hdr *ip6;
+ proto = IPPROTO_IPV6;
+ if (m->m_len < sizeof(*ip6)) {
+ m = m_pullup(m, sizeof(*ip6));
+ if (!m)
+ return ENOBUFS;
+ }
+ ip6 = mtod(m, struct ip6_hdr *);
+ itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
+ break;
+ }
+#endif
+ default:
+#ifdef DEBUG
+ printf("in6_gif_output: warning: unknown family %d passed\n",
+ family);
+#endif
+ m_freem(m);
+ return EAFNOSUPPORT;
+ }
+
+ /* prepend new IP header */
+ M_PREPEND(m, sizeof(struct ip6_hdr), M_DONTWAIT);
+ if (m && m->m_len < sizeof(struct ip6_hdr))
+ m = m_pullup(m, sizeof(struct ip6_hdr));
+ if (m == NULL) {
+ printf("ENOBUFS in in6_gif_output %d\n", __LINE__);
+ return ENOBUFS;
+ }
+
+ ip6 = mtod(m, struct ip6_hdr *);
+ ip6->ip6_flow = 0;
+ ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
+ ip6->ip6_vfc |= IPV6_VERSION;
+ ip6->ip6_plen = htons((u_short)m->m_pkthdr.len);
+ ip6->ip6_nxt = proto;
+ ip6->ip6_hlim = ip6_gif_hlim;
+ ip6->ip6_src = sin6_src->sin6_addr;
+ /* bidirectional configured tunnel mode */
+ if (!IN6_IS_ADDR_UNSPECIFIED(&sin6_dst->sin6_addr))
+ ip6->ip6_dst = sin6_dst->sin6_addr;
+ else {
+ m_freem(m);
+ return ENETUNREACH;
+ }
+ if (ifp->if_flags & IFF_LINK1)
+ ip_ecn_ingress(ECN_ALLOWED, &otos, &itos);
+ else
+ ip_ecn_ingress(ECN_NOCARE, &otos, &itos);
+ ip6->ip6_flow &= ~ntohl(0xff00000);
+ ip6->ip6_flow |= htonl((u_int32_t)otos << 20);
+
+ if (dst->sin6_family != sin6_dst->sin6_family ||
+ !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &sin6_dst->sin6_addr)) {
+ /* cache route doesn't match */
+ bzero(dst, sizeof(*dst));
+ dst->sin6_family = sin6_dst->sin6_family;
+ dst->sin6_len = sizeof(struct sockaddr_in6);
+ dst->sin6_addr = sin6_dst->sin6_addr;
+ if (sc->gif_ro6.ro_rt) {
+ RTFREE(sc->gif_ro6.ro_rt);
+ sc->gif_ro6.ro_rt = NULL;
+ }
+#if 0
+ sc->gif_if.if_mtu = GIF_MTU;
+#endif
+ }
+
+ if (sc->gif_ro6.ro_rt == NULL) {
+ rtalloc((struct route *)&sc->gif_ro6);
+ if (sc->gif_ro6.ro_rt == NULL) {
+ m_freem(m);
+ return ENETUNREACH;
+ }
+
+ /* if it constitutes infinite encapsulation, punt. */
+ if (sc->gif_ro.ro_rt->rt_ifp == ifp) {
+ m_freem(m);
+ return ENETUNREACH; /*XXX*/
+ }
+#if 0
+ ifp->if_mtu = sc->gif_ro6.ro_rt->rt_ifp->if_mtu
+ - sizeof(struct ip6_hdr);
+#endif
+ }
+
+#ifdef IPV6_MINMTU
+ /*
+ * force fragmentation to minimum MTU, to avoid path MTU discovery.
+ * it is too painful to ask for resend of inner packet, to achieve
+ * path MTU discovery for encapsulated packets.
+ */
+ return(ip6_output(m, 0, &sc->gif_ro6, IPV6_MINMTU, 0, NULL, NULL));
+#else
+ return(ip6_output(m, 0, &sc->gif_ro6, 0, 0, NULL, NULL));
+#endif
+}
+
+int in6_gif_input(mp, offp, proto)
+ struct mbuf **mp;
+ int *offp, proto;
+{
+ struct mbuf *m = *mp;
+ struct ifnet *gifp = NULL;
+ struct ip6_hdr *ip6;
+ int af = 0;
+ u_int32_t otos;
+
+ ip6 = mtod(m, struct ip6_hdr *);
+
+ gifp = (struct ifnet *)encap_getarg(m);
+
+ if (gifp == NULL || (gifp->if_flags & IFF_UP) == 0) {
+ m_freem(m);
+ ip6stat.ip6s_nogif++;
+ return IPPROTO_DONE;
+ }
+
+ otos = ip6->ip6_flow;
+ m_adj(m, *offp);
+
+ switch (proto) {
+#ifdef INET
+ case IPPROTO_IPV4:
+ {
+ struct ip *ip;
+ u_int8_t otos8;
+ af = AF_INET;
+ otos8 = (ntohl(otos) >> 20) & 0xff;
+ if (m->m_len < sizeof(*ip)) {
+ m = m_pullup(m, sizeof(*ip));
+ if (!m)
+ return IPPROTO_DONE;
+ }
+ ip = mtod(m, struct ip *);
+ if (gifp->if_flags & IFF_LINK1)
+ ip_ecn_egress(ECN_ALLOWED, &otos8, &ip->ip_tos);
+ else
+ ip_ecn_egress(ECN_NOCARE, &otos8, &ip->ip_tos);
+ break;
+ }
+#endif /* INET */
+#ifdef INET6
+ case IPPROTO_IPV6:
+ {
+ struct ip6_hdr *ip6;
+ af = AF_INET6;
+ if (m->m_len < sizeof(*ip6)) {
+ m = m_pullup(m, sizeof(*ip6));
+ if (!m)
+ return IPPROTO_DONE;
+ }
+ ip6 = mtod(m, struct ip6_hdr *);
+ if (gifp->if_flags & IFF_LINK1)
+ ip6_ecn_egress(ECN_ALLOWED, &otos, &ip6->ip6_flow);
+ else
+ ip6_ecn_egress(ECN_NOCARE, &otos, &ip6->ip6_flow);
+ break;
+ }
+#endif
+ default:
+ ip6stat.ip6s_nogif++;
+ m_freem(m);
+ return IPPROTO_DONE;
+ }
+
+ gif_input(m, af, gifp);
+ return IPPROTO_DONE;
+}
+
+/*
+ * validate outer address.
+ */
+static int
+gif_validate6(ip6, sc, ifp)
+ const struct ip6_hdr *ip6;
+ struct gif_softc *sc;
+ struct ifnet *ifp;
+{
+ struct sockaddr_in6 *src, *dst;
+
+ src = (struct sockaddr_in6 *)sc->gif_psrc;
+ dst = (struct sockaddr_in6 *)sc->gif_pdst;
+
+ /*
+ * Check for address match. Note that the check is for an incoming
+ * packet. We should compare the *source* address in our configuration
+ * and the *destination* address of the packet, and vice versa.
+ */
+ if (!IN6_ARE_ADDR_EQUAL(&src->sin6_addr, &ip6->ip6_dst) ||
+ !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &ip6->ip6_src))
+ return 0;
+
+ /* martian filters on outer source - done in ip6_input */
+
+ /* ingress filters on outer source */
+ if ((sc->gif_if.if_flags & IFF_LINK2) == 0 && ifp) {
+ struct sockaddr_in6 sin6;
+ struct rtentry *rt;
+
+ bzero(&sin6, sizeof(sin6));
+ sin6.sin6_family = AF_INET6;
+ sin6.sin6_len = sizeof(struct sockaddr_in6);
+ sin6.sin6_addr = ip6->ip6_src;
+#ifndef SCOPEDROUTING
+ sin6.sin6_scope_id = 0; /* XXX */
+#endif
+
+ rt = rtalloc1((struct sockaddr *)&sin6, 0, 0UL);
+ if (!rt || rt->rt_ifp != ifp) {
+#if 0
+ log(LOG_WARNING, "%s: packet from %s dropped "
+ "due to ingress filter\n", if_name(&sc->gif_if),
+ ip6_sprintf(&sin6.sin6_addr));
+#endif
+ if (rt)
+ rtfree(rt);
+ return 0;
+ }
+ rtfree(rt);
+ }
+
+ return 128 * 2;
+}
+
+/*
+ * we know that we are in IFF_UP, outer address available, and outer family
+ * matched the physical addr family. see gif_encapcheck().
+ * sanity check for arg should have been done in the caller.
+ */
+int
+gif_encapcheck6(m, off, proto, arg)
+ const struct mbuf *m;
+ int off;
+ int proto;
+ void *arg;
+{
+ struct ip6_hdr ip6;
+ struct gif_softc *sc;
+ struct ifnet *ifp;
+
+ /* sanity check done in caller */
+ sc = (struct gif_softc *)arg;
+
+ /* LINTED const cast */
+ m_copydata(m, 0, sizeof(ip6), (caddr_t)&ip6);
+ ifp = ((m->m_flags & M_PKTHDR) != 0) ? m->m_pkthdr.rcvif : NULL;
+
+ return gif_validate6(&ip6, sc, ifp);
+}
+
+int
+in6_gif_attach(sc)
+ struct gif_softc *sc;
+{
+ sc->encap_cookie6 = encap_attach_func(AF_INET6, -1, gif_encapcheck,
+ (struct protosw *)&in6_gif_protosw, sc);
+ if (sc->encap_cookie6 == NULL)
+ return EEXIST;
+ return 0;
+}
+
+int
+in6_gif_detach(sc)
+ struct gif_softc *sc;
+{
+ int error;
+
+ error = encap_detach(sc->encap_cookie6);
+ if (error == 0)
+ sc->encap_cookie6 = NULL;
+ return error;
+}
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