241 lines
6.2 KiB
C
241 lines
6.2 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: in_gif.c,v 1.54 2001/05/14 14:02:16 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/lock.h>
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#include <sys/rmlock.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/if_var.h>
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#include <net/route.h>
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#include <net/vnet.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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#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 = 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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VNET_DEFINE(int, ip_gif_ttl) = GIF_TTL;
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#define V_ip_gif_ttl VNET(ip_gif_ttl)
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SYSCTL_INT(_net_inet_ip, IPCTL_GIF_TTL, gifttl, CTLFLAG_VNET | CTLFLAG_RW,
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&VNET_NAME(ip_gif_ttl), 0, "");
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int
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in_gif_output(struct ifnet *ifp, struct mbuf *m, int proto, uint8_t ecn)
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{
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GIF_RLOCK_TRACKER;
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struct gif_softc *sc = ifp->if_softc;
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struct ip *ip;
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int len;
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/* prepend new IP header */
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len = sizeof(struct ip);
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#ifndef __NO_STRICT_ALIGNMENT
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if (proto == IPPROTO_ETHERIP)
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len += ETHERIP_ALIGN;
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#endif
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M_PREPEND(m, len, M_NOWAIT);
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if (m == NULL)
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return (ENOBUFS);
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#ifndef __NO_STRICT_ALIGNMENT
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if (proto == IPPROTO_ETHERIP) {
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len = mtod(m, vm_offset_t) & 3;
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KASSERT(len == 0 || len == ETHERIP_ALIGN,
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("in_gif_output: unexpected misalignment"));
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m->m_data += len;
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m->m_len -= ETHERIP_ALIGN;
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}
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#endif
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ip = mtod(m, struct ip *);
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GIF_RLOCK(sc);
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if (sc->gif_family != AF_INET) {
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m_freem(m);
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GIF_RUNLOCK(sc);
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return (ENETDOWN);
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}
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bcopy(sc->gif_iphdr, ip, sizeof(struct ip));
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GIF_RUNLOCK(sc);
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ip->ip_p = proto;
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/* version will be set in ip_output() */
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ip->ip_ttl = V_ip_gif_ttl;
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ip->ip_len = htons(m->m_pkthdr.len);
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ip->ip_tos = ecn;
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return (ip_output(m, NULL, NULL, 0, NULL, NULL));
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}
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int
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in_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 gif_softc *sc;
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struct ifnet *gifp;
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struct ip *ip;
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uint8_t ecn;
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sc = encap_getarg(m);
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if (sc == NULL) {
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m_freem(m);
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KMOD_IPSTAT_INC(ips_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->if_flags & IFF_UP) != 0) {
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ip = mtod(m, struct ip *);
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ecn = ip->ip_tos;
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m_adj(m, *offp);
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gif_input(m, gifp, proto, ecn);
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} else {
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m_freem(m);
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KMOD_IPSTAT_INC(ips_nogif);
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}
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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_validate4(const struct ip *ip, struct gif_softc *sc, struct ifnet *ifp)
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{
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GIF_RLOCK_ASSERT(sc);
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/* check for address match */
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if (sc->gif_iphdr->ip_src.s_addr != ip->ip_dst.s_addr ||
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sc->gif_iphdr->ip_dst.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:
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case 127:
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case 255:
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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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/* XXX MRT check for the interface we would use on output */
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rt = in_rtalloc1((struct sockaddr *)&sin, 0,
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0UL, sc->gif_fibnum);
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if (!rt || rt->rt_ifp != ifp) {
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if (rt)
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RTFREE_LOCKED(rt);
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return (0);
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}
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RTFREE_LOCKED(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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in_gif_encapcheck(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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GIF_RLOCK_ASSERT(sc);
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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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KASSERT(sc->gif_ecookie == NULL, ("gif_ecookie isn't NULL"));
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sc->gif_ecookie = encap_attach_func(AF_INET, -1, gif_encapcheck,
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&in_gif_protosw, sc);
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if (sc->gif_ecookie == NULL)
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return (EEXIST);
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return (0);
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}
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