426 lines
10 KiB
C
426 lines
10 KiB
C
/*-
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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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* $KAME: in6_gif.c,v 1.49 2001/05/14 14:02:17 itojun Exp $
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_inet.h"
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#include "opt_inet6.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/queue.h>
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#include <sys/syslog.h>
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#include <sys/protosw.h>
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#include <sys/malloc.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/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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#ifdef INET6
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#include <netinet6/ip6_ecn.h>
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#endif
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#include <net/if_gif.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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extern struct domain inet6domain;
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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, 0, rip6_ctloutput,
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0,
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0, 0, 0, 0,
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&rip6_usrreqs
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};
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int
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in6_gif_output(struct ifnet *ifp,
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int family, /* family of the packet to be encapsulate */
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struct mbuf *m)
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{
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struct gif_softc *sc = ifp->if_softc;
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struct sockaddr_in6 *dst = (struct sockaddr_in6 *)&sc->gif_ro6.ro_dst;
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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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struct etherip_header eiphdr;
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int proto, error;
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u_int8_t itos, otos;
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GIF_LOCK_ASSERT(sc);
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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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struct ip6_hdr *ip6;
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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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case AF_LINK:
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proto = IPPROTO_ETHERIP;
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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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/* prepend Ethernet-in-IP header */
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M_PREPEND(m, sizeof(struct etherip_header), M_DONTWAIT);
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if (m && m->m_len < 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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bcopy(&eiphdr, mtod(m, struct etherip_header *),
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sizeof(struct etherip_header));
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break;
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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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printf("ENOBUFS in in6_gif_output %d\n", __LINE__);
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return ENOBUFS;
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}
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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_plen = htons((u_short)m->m_pkthdr.len);
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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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ip_ecn_ingress((ifp->if_flags & IFF_LINK1) ? ECN_ALLOWED : ECN_NOCARE,
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&otos, &itos);
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ip6->ip6_flow &= ~htonl(0xff << 20);
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ip6->ip6_flow |= htonl((u_int32_t)otos << 20);
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if (dst->sin6_family != sin6_dst->sin6_family ||
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!IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &sin6_dst->sin6_addr)) {
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/* cache route doesn't match */
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bzero(dst, sizeof(*dst));
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dst->sin6_family = sin6_dst->sin6_family;
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dst->sin6_len = sizeof(struct sockaddr_in6);
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dst->sin6_addr = sin6_dst->sin6_addr;
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if (sc->gif_ro6.ro_rt) {
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RTFREE(sc->gif_ro6.ro_rt);
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sc->gif_ro6.ro_rt = NULL;
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}
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#if 0
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GIF2IFP(sc)->if_mtu = GIF_MTU;
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#endif
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}
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if (sc->gif_ro6.ro_rt == NULL) {
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rtalloc((struct route *)&sc->gif_ro6);
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if (sc->gif_ro6.ro_rt == 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 (sc->gif_ro.ro_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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#if 0
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ifp->if_mtu = sc->gif_ro6.ro_rt->rt_ifp->if_mtu
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- sizeof(struct ip6_hdr);
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#endif
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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_ro6, IPV6_MINMTU, 0, NULL, NULL);
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#else
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error = ip6_output(m, 0, &sc->gif_ro6, 0, 0, NULL, NULL);
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#endif
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if (!(GIF2IFP(sc)->if_flags & IFF_LINK0) &&
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sc->gif_ro6.ro_rt != NULL) {
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RTFREE(sc->gif_ro6.ro_rt);
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sc->gif_ro6.ro_rt = NULL;
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}
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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 gif_softc *sc;
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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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sc = (struct gif_softc *)encap_getarg(m);
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if (sc == NULL) {
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m_freem(m);
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ip6stat.ip6s_nogif++;
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return IPPROTO_DONE;
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}
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gifp = GIF2IFP(sc);
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if (gifp == NULL || (gifp->if_flags & IFF_UP) == 0) {
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m_freem(m);
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ip6stat.ip6s_nogif++;
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return IPPROTO_DONE;
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}
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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 (ip_ecn_egress((gifp->if_flags & IFF_LINK1) ?
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ECN_ALLOWED : ECN_NOCARE,
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&otos8, &ip->ip_tos) == 0) {
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m_freem(m);
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return IPPROTO_DONE;
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}
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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 *ip6;
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af = AF_INET6;
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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 IPPROTO_DONE;
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}
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ip6 = mtod(m, struct ip6_hdr *);
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if (ip6_ecn_egress((gifp->if_flags & IFF_LINK1) ?
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ECN_ALLOWED : ECN_NOCARE,
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&otos, &ip6->ip6_flow) == 0) {
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m_freem(m);
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return IPPROTO_DONE;
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}
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break;
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}
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#endif
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case IPPROTO_ETHERIP:
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af = AF_LINK;
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break;
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default:
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ip6stat.ip6s_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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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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/*
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* Check for address match. Note that the check is for an incoming
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* packet. We should compare the *source* address in our configuration
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* and the *destination* address of the packet, and vice versa.
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*/
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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 ((GIF2IFP(sc)->if_flags & IFF_LINK2) == 0 && ifp) {
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struct sockaddr_in6 sin6;
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struct rtentry *rt;
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bzero(&sin6, sizeof(sin6));
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sin6.sin6_family = AF_INET6;
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sin6.sin6_len = sizeof(struct sockaddr_in6);
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sin6.sin6_addr = ip6->ip6_src;
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sin6.sin6_scope_id = 0; /* XXX */
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rt = rtalloc1((struct sockaddr *)&sin6, 0, 0UL);
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if (!rt || rt->rt_ifp != ifp) {
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#if 0
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char ip6buf[INET6_ADDRSTRLEN];
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log(LOG_WARNING, "%s: packet from %s dropped "
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"due to ingress filter\n", if_name(GIF2IFP(sc)),
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ip6_sprintf(ip6buf, &sin6.sin6_addr));
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#endif
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if (rt)
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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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/*
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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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* sanity check for arg should have been done in the caller.
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*/
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int
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gif_encapcheck6(const 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 = (struct gif_softc *)arg;
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/* LINTED const cast */
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m_copydata(m, 0, sizeof(ip6), (caddr_t)&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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int
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in6_gif_attach(struct gif_softc *sc)
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{
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sc->encap_cookie6 = encap_attach_func(AF_INET6, -1, gif_encapcheck,
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(void *)&in6_gif_protosw, sc);
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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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return error;
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}
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