469 lines
11 KiB
C
469 lines
11 KiB
C
/* $NetBSD: in6_gif.c,v 1.58 2009/03/14 14:46:10 dsl Exp $ */
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/* $KAME: in6_gif.c,v 1.62 2001/07/29 04:27:25 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: in6_gif.c,v 1.58 2009/03/14 14:46:10 dsl Exp $");
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#include "opt_inet.h"
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#include "opt_iso.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/errno.h>
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#include <sys/ioctl.h>
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#include <sys/queue.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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#include <netinet/ip_encap.h>
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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_gif.h>
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#include <netinet6/in6_var.h>
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#endif
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#include <netinet6/ip6protosw.h>
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#include <netinet/ip_ecn.h>
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#include <net/if_gif.h>
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#include <net/net_osdep.h>
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static int gif_validate6(const struct ip6_hdr *, struct gif_softc *,
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struct ifnet *);
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int ip6_gif_hlim = GIF_HLIM;
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extern LIST_HEAD(, gif_softc) gif_softc_list;
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extern const struct ip6protosw in6_gif_protosw;
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/*
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* family - family of the packet to be encapsulate.
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*/
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int
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in6_gif_output(struct ifnet *ifp, int family, struct mbuf *m)
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{
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struct rtentry *rt;
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struct gif_softc *sc = ifp->if_softc;
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struct sockaddr_in6 *sin6_src = (struct sockaddr_in6 *)sc->gif_psrc;
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struct sockaddr_in6 *sin6_dst = (struct sockaddr_in6 *)sc->gif_pdst;
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struct ip6_hdr *ip6;
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int proto, error;
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u_int8_t itos, otos;
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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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if (sin6_src == NULL || 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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switch (family) {
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#ifdef INET
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case AF_INET:
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{
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struct ip *ip;
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proto = IPPROTO_IPV4;
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if (m->m_len < sizeof(*ip)) {
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m = m_pullup(m, sizeof(*ip));
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if (!m)
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return ENOBUFS;
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}
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ip = mtod(m, struct ip *);
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itos = ip->ip_tos;
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break;
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}
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#endif
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#ifdef INET6
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case AF_INET6:
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{
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proto = IPPROTO_IPV6;
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if (m->m_len < sizeof(*ip6)) {
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m = m_pullup(m, sizeof(*ip6));
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if (!m)
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return ENOBUFS;
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}
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ip6 = mtod(m, struct ip6_hdr *);
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itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
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break;
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}
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#endif
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#ifdef ISO
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case AF_ISO:
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proto = IPPROTO_EON;
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itos = 0;
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break;
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#endif
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default:
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#ifdef DEBUG
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printf("in6_gif_output: warning: unknown family %d passed\n",
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family);
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#endif
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m_freem(m);
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return EAFNOSUPPORT;
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}
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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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#if 0 /* ip6->ip6_plen will be filled by ip6_output */
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ip6->ip6_plen = htons((u_int16_t)m->m_pkthdr.len);
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#endif
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ip6->ip6_nxt = proto;
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ip6->ip6_hlim = ip6_gif_hlim;
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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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if (ifp->if_flags & IFF_LINK1)
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ip_ecn_ingress(ECN_ALLOWED, &otos, &itos);
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else
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ip_ecn_ingress(ECN_NOCARE, &otos, &itos);
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ip6->ip6_flow &= ~ntohl(0xff00000);
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ip6->ip6_flow |= htonl((u_int32_t)otos << 20);
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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->gif_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 the route constitutes infinite encapsulation, punt. */
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if (rt->rt_ifp == ifp) {
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m_freem(m);
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return ENETUNREACH; /* XXX */
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}
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#ifdef IPV6_MINMTU
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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->gif_ro, IPV6_MINMTU, NULL, NULL, NULL);
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#else
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error = ip6_output(m, 0, &sc->gif_ro, 0, NULL, NULL, NULL);
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#endif
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return (error);
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}
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int
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in6_gif_input(struct mbuf **mp, int *offp, int proto)
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{
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struct mbuf *m = *mp;
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struct ifnet *gifp = NULL;
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struct ip6_hdr *ip6;
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int af = 0;
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u_int32_t otos;
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ip6 = mtod(m, struct ip6_hdr *);
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gifp = (struct ifnet *)encap_getarg(m);
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if (gifp == NULL || (gifp->if_flags & IFF_UP) == 0) {
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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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#ifndef GIF_ENCAPCHECK
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if (!gif_validate6(ip6, gifp->if_softc, m->m_pkthdr.rcvif)) {
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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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#endif
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otos = ip6->ip6_flow;
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m_adj(m, *offp);
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switch (proto) {
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#ifdef INET
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case IPPROTO_IPV4:
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{
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struct ip *ip;
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u_int8_t otos8;
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af = AF_INET;
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otos8 = (ntohl(otos) >> 20) & 0xff;
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if (m->m_len < sizeof(*ip)) {
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m = m_pullup(m, sizeof(*ip));
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if (!m)
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return IPPROTO_DONE;
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}
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ip = mtod(m, struct ip *);
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if (gifp->if_flags & IFF_LINK1)
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ip_ecn_egress(ECN_ALLOWED, &otos8, &ip->ip_tos);
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else
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ip_ecn_egress(ECN_NOCARE, &otos8, &ip->ip_tos);
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break;
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}
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#endif /* INET */
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#ifdef INET6
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case IPPROTO_IPV6:
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{
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struct ip6_hdr *ip6x;
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af = AF_INET6;
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if (m->m_len < sizeof(*ip6x)) {
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m = m_pullup(m, sizeof(*ip6x));
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if (!m)
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return IPPROTO_DONE;
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}
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ip6x = mtod(m, struct ip6_hdr *);
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if (gifp->if_flags & IFF_LINK1)
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ip6_ecn_egress(ECN_ALLOWED, &otos, &ip6x->ip6_flow);
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else
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ip6_ecn_egress(ECN_NOCARE, &otos, &ip6x->ip6_flow);
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break;
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}
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#endif
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#ifdef ISO
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case IPPROTO_EON:
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af = AF_ISO;
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break;
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#endif
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default:
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IP6_STATINC(IP6_STAT_NOGIF);
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m_freem(m);
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return IPPROTO_DONE;
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}
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gif_input(m, af, gifp);
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return IPPROTO_DONE;
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}
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/*
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* validate outer address.
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*/
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static int
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gif_validate6(const struct ip6_hdr *ip6, struct gif_softc *sc,
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struct ifnet *ifp)
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{
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const struct sockaddr_in6 *src, *dst;
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src = (struct sockaddr_in6 *)sc->gif_psrc;
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dst = (struct sockaddr_in6 *)sc->gif_pdst;
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/* check for address match */
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if (!IN6_ARE_ADDR_EQUAL(&src->sin6_addr, &ip6->ip6_dst) ||
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!IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &ip6->ip6_src))
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return 0;
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/* martian filters on outer source - done in ip6_input */
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/* ingress filters on outer source */
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if ((sc->gif_if.if_flags & IFF_LINK2) == 0 && ifp) {
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union {
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struct sockaddr sa;
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struct sockaddr_in6 sin6;
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} u;
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struct rtentry *rt;
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/* XXX scopeid */
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sockaddr_in6_init(&u.sin6, &ip6->ip6_src, 0, 0, 0);
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rt = rtalloc1(&u.sa, 0);
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if (rt == NULL || rt->rt_ifp != ifp) {
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#if 0
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log(LOG_WARNING, "%s: packet from %s dropped "
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"due to ingress filter\n", if_name(&sc->gif_if),
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ip6_sprintf(&u.sin6.sin6_addr));
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#endif
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if (rt != NULL)
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rtfree(rt);
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return 0;
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}
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rtfree(rt);
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}
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return 128 * 2;
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}
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#ifdef GIF_ENCAPCHECK
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/*
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* we know that we are in IFF_UP, outer address available, and outer family
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* matched the physical addr family. see gif_encapcheck().
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*/
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int
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gif_encapcheck6(struct mbuf *m, int off, int proto, void *arg)
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{
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struct ip6_hdr ip6;
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struct gif_softc *sc;
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struct ifnet *ifp;
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/* sanity check done in caller */
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sc = arg;
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m_copydata(m, 0, sizeof(ip6), (void *)&ip6);
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ifp = ((m->m_flags & M_PKTHDR) != 0) ? m->m_pkthdr.rcvif : NULL;
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return gif_validate6(&ip6, sc, ifp);
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}
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#endif
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int
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in6_gif_attach(struct gif_softc *sc)
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{
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#ifndef GIF_ENCAPCHECK
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struct sockaddr_in6 mask6;
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memset(&mask6, 0, sizeof(mask6));
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mask6.sin6_len = sizeof(struct sockaddr_in6);
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mask6.sin6_addr.s6_addr32[0] = mask6.sin6_addr.s6_addr32[1] =
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mask6.sin6_addr.s6_addr32[2] = mask6.sin6_addr.s6_addr32[3] = ~0;
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if (!sc->gif_psrc || !sc->gif_pdst)
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return EINVAL;
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sc->encap_cookie6 = encap_attach(AF_INET6, -1, sc->gif_psrc,
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(struct sockaddr *)&mask6, sc->gif_pdst, (struct sockaddr *)&mask6,
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(const void *)&in6_gif_protosw, sc);
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#else
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sc->encap_cookie6 = encap_attach_func(AF_INET6, -1, gif_encapcheck,
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(struct protosw *)&in6_gif_protosw, sc);
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#endif
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if (sc->encap_cookie6 == NULL)
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return EEXIST;
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return 0;
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}
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int
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in6_gif_detach(struct gif_softc *sc)
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{
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int error;
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error = encap_detach(sc->encap_cookie6);
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if (error == 0)
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sc->encap_cookie6 = NULL;
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rtcache_free(&sc->gif_ro);
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return error;
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}
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void *
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in6_gif_ctlinput(int cmd, const struct sockaddr *sa, void *d)
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{
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struct gif_softc *sc;
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struct ip6ctlparam *ip6cp = NULL;
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struct ip6_hdr *ip6;
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const struct sockaddr_in6 *dst6;
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if (sa->sa_family != AF_INET6 ||
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sa->sa_len != sizeof(struct sockaddr_in6))
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return NULL;
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if ((unsigned)cmd >= PRC_NCMDS)
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return NULL;
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if (cmd == PRC_HOSTDEAD)
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d = NULL;
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else if (inet6ctlerrmap[cmd] == 0)
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return NULL;
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/* if the parameter is from icmp6, decode it. */
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if (d != NULL) {
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ip6cp = (struct ip6ctlparam *)d;
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ip6 = ip6cp->ip6c_ip6;
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} else {
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ip6 = NULL;
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}
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if (!ip6)
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return NULL;
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/*
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* for now we don't care which type it was, just flush the route cache.
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* XXX slow. sc (or sc->encap_cookie6) should be passed from
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* ip_encap.c.
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*/
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LIST_FOREACH(sc, &gif_softc_list, gif_list) {
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if ((sc->gif_if.if_flags & IFF_RUNNING) == 0)
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continue;
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if (sc->gif_psrc->sa_family != AF_INET6)
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continue;
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dst6 = satocsin6(rtcache_getdst(&sc->gif_ro));
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/* XXX scope */
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if (dst6 == NULL)
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;
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else if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &dst6->sin6_addr))
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rtcache_free(&sc->gif_ro);
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}
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return NULL;
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}
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PR_WRAP_CTLINPUT(in6_gif_ctlinput)
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PR_WRAP_CTLOUTPUT(rip6_ctloutput)
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PR_WRAP_USRREQ(rip6_usrreq)
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#define in6_gif_ctlinput in6_gif_ctlinput_wrapper
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#define rip6_ctloutput rip6_ctloutput_wrapper
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#define rip6_usrreq rip6_usrreq_wrapper
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extern struct domain inet6domain;
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const struct ip6protosw in6_gif_protosw =
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{ SOCK_RAW, &inet6domain, 0/* IPPROTO_IPV[46] */, PR_ATOMIC|PR_ADDR,
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in6_gif_input, rip6_output, in6_gif_ctlinput, rip6_ctloutput,
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rip6_usrreq,
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0, 0, 0, 0,
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};
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