427 lines
10 KiB
C
427 lines
10 KiB
C
/* $FreeBSD$ */
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/* $KAME: in_gif.c,v 1.54 2001/05/14 14:02:16 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 "opt_mrouting.h"
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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/kernel.h>
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#include <sys/sysctl.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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#include <netinet/ip.h>
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#include <netinet/ip_var.h>
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#include <netinet/in_gif.h>
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#include <netinet/in_var.h>
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#include <netinet/ip_encap.h>
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#include <netinet/ip_ecn.h>
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#ifdef INET6
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#include <netinet/ip6.h>
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#endif
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#ifdef MROUTING
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#include <netinet/ip_mroute.h>
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#endif /* MROUTING */
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#include <net/if_gif.h>
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static int gif_validate4(const struct ip *, struct gif_softc *,
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struct ifnet *);
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extern struct domain inetdomain;
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struct protosw in_gif_protosw = {
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.pr_type = SOCK_RAW,
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.pr_domain = &inetdomain,
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.pr_protocol = 0/* IPPROTO_IPV[46] */,
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.pr_flags = PR_ATOMIC|PR_ADDR,
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.pr_input = in_gif_input,
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.pr_output = (pr_output_t*)rip_output,
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.pr_ctloutput = rip_ctloutput,
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.pr_usrreqs = &rip_usrreqs
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};
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static int ip_gif_ttl = GIF_TTL;
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SYSCTL_INT(_net_inet_ip, IPCTL_GIF_TTL, gifttl, CTLFLAG_RW,
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&ip_gif_ttl, 0, "");
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int
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in_gif_output(struct ifnet *ifp, int family, struct mbuf *m)
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{
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struct gif_softc *sc = ifp->if_softc;
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struct sockaddr_in *dst = (struct sockaddr_in *)&sc->gif_ro.ro_dst;
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struct sockaddr_in *sin_src = (struct sockaddr_in *)sc->gif_psrc;
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struct sockaddr_in *sin_dst = (struct sockaddr_in *)sc->gif_pdst;
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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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u_int8_t tos;
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GIF_LOCK_ASSERT(sc);
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if (sin_src == NULL || 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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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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tos = 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 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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tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
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break;
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}
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#endif /* INET6 */
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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("in_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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bzero(&iphdr, sizeof(iphdr));
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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 = ip_gif_ttl;
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iphdr.ip_len = m->m_pkthdr.len + sizeof(struct ip);
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ip_ecn_ingress((ifp->if_flags & IFF_LINK1) ? ECN_ALLOWED : ECN_NOCARE,
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&iphdr.ip_tos, &tos);
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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 && m->m_len < sizeof(struct ip))
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m = m_pullup(m, sizeof(struct ip));
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if (m == NULL) {
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printf("ENOBUFS in in_gif_output %d\n", __LINE__);
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return ENOBUFS;
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}
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bcopy(&iphdr, mtod(m, struct ip *), sizeof(struct ip));
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if (dst->sin_family != sin_dst->sin_family ||
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dst->sin_addr.s_addr != sin_dst->sin_addr.s_addr) {
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/* cache route doesn't match */
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bzero(dst, sizeof(*dst));
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dst->sin_family = sin_dst->sin_family;
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dst->sin_len = sizeof(struct sockaddr_in);
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dst->sin_addr = sin_dst->sin_addr;
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if (sc->gif_ro.ro_rt) {
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RTFREE(sc->gif_ro.ro_rt);
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sc->gif_ro.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_ro.ro_rt == NULL) {
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rtalloc_ign(&sc->gif_ro, 0);
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if (sc->gif_ro.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_ro.ro_rt->rt_ifp->if_mtu
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- sizeof(struct ip);
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#endif
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}
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error = ip_output(m, NULL, &sc->gif_ro, 0, NULL, NULL);
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if (!(GIF2IFP(sc)->if_flags & IFF_LINK0) &&
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sc->gif_ro.ro_rt != NULL) {
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RTFREE(sc->gif_ro.ro_rt);
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sc->gif_ro.ro_rt = NULL;
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}
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return (error);
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}
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void
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in_gif_input(struct mbuf *m, int off)
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{
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struct ifnet *gifp = NULL;
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struct gif_softc *sc;
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struct ip *ip;
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int af;
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u_int8_t otos;
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int proto;
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ip = mtod(m, struct ip *);
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proto = ip->ip_p;
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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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ipstat.ips_nogif++;
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return;
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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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ipstat.ips_nogif++;
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return;
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}
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otos = ip->ip_tos;
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m_adj(m, off);
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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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af = AF_INET;
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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;
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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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&otos, &ip->ip_tos) == 0) {
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m_freem(m);
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return;
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}
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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 IPPROTO_IPV6:
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{
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struct ip6_hdr *ip6;
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u_int8_t itos, oitos;
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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;
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}
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ip6 = mtod(m, struct ip6_hdr *);
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itos = oitos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
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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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&otos, &itos) == 0) {
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m_freem(m);
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return;
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}
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if (itos != oitos) {
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ip6->ip6_flow &= ~htonl(0xff << 20);
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ip6->ip6_flow |= htonl((u_int32_t)itos << 20);
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}
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break;
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}
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#endif /* INET6 */
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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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ipstat.ips_nogif++;
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m_freem(m);
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return;
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}
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gif_input(m, af, gifp);
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return;
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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_validate4(const struct ip *ip, struct gif_softc *sc, struct ifnet *ifp)
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{
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struct sockaddr_in *src, *dst;
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struct in_ifaddr *ia4;
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src = (struct sockaddr_in *)sc->gif_psrc;
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dst = (struct sockaddr_in *)sc->gif_pdst;
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/* check for address match */
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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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return 0;
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/* martian filters on outer source - NOT done in ip_input! */
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if (IN_MULTICAST(ntohl(ip->ip_src.s_addr)))
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return 0;
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switch ((ntohl(ip->ip_src.s_addr) & 0xff000000) >> 24) {
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case 0: case 127: case 255:
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return 0;
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}
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/* reject packets with broadcast on source */
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TAILQ_FOREACH(ia4, &in_ifaddrhead, ia_link) {
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if ((ia4->ia_ifa.ifa_ifp->if_flags & IFF_BROADCAST) == 0)
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continue;
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if (ip->ip_src.s_addr == ia4->ia_broadaddr.sin_addr.s_addr)
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return 0;
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}
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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_in sin;
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struct rtentry *rt;
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bzero(&sin, sizeof(sin));
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sin.sin_family = AF_INET;
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sin.sin_len = sizeof(struct sockaddr_in);
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sin.sin_addr = ip->ip_src;
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rt = rtalloc1((struct sockaddr *)&sin, 0, 0UL);
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if (!rt || rt->rt_ifp != ifp) {
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#if 0
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log(LOG_WARNING, "%s: packet from 0x%x dropped "
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"due to ingress filter\n", if_name(GIF2IFP(sc)),
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(u_int32_t)ntohl(sin.sin_addr.s_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 32 * 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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*/
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int
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gif_encapcheck4(const struct mbuf *m, int off, int proto, void *arg)
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{
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struct ip ip;
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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(ip), (caddr_t)&ip);
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ifp = ((m->m_flags & M_PKTHDR) != 0) ? m->m_pkthdr.rcvif : NULL;
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return gif_validate4(&ip, sc, ifp);
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}
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int
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in_gif_attach(struct gif_softc *sc)
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{
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sc->encap_cookie4 = encap_attach_func(AF_INET, -1, gif_encapcheck,
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&in_gif_protosw, sc);
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if (sc->encap_cookie4 == 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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in_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_cookie4);
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if (error == 0)
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sc->encap_cookie4 = NULL;
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return error;
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}
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