235 lines
6.0 KiB
C
235 lines
6.0 KiB
C
/*-
|
|
* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Neither the name of the project nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* $KAME: in_gif.c,v 1.54 2001/05/14 14:02:16 itojun Exp $
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include "opt_inet.h"
|
|
#include "opt_inet6.h"
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/lock.h>
|
|
#include <sys/rmlock.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/socket.h>
|
|
#include <sys/sockio.h>
|
|
#include <sys/mbuf.h>
|
|
#include <sys/errno.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/sysctl.h>
|
|
#include <sys/protosw.h>
|
|
#include <sys/malloc.h>
|
|
|
|
#include <net/if.h>
|
|
#include <net/if_var.h>
|
|
#include <net/route.h>
|
|
#include <net/vnet.h>
|
|
|
|
#include <netinet/in.h>
|
|
#include <netinet/in_systm.h>
|
|
#include <netinet/ip.h>
|
|
#include <netinet/ip_var.h>
|
|
#include <netinet/in_gif.h>
|
|
#include <netinet/in_var.h>
|
|
#include <netinet/ip_encap.h>
|
|
#include <netinet/ip_ecn.h>
|
|
|
|
#ifdef INET6
|
|
#include <netinet/ip6.h>
|
|
#endif
|
|
|
|
#include <net/if_gif.h>
|
|
#include <net/rt_nhops.h>
|
|
|
|
static int gif_validate4(const struct ip *, struct gif_softc *,
|
|
struct ifnet *);
|
|
|
|
extern struct domain inetdomain;
|
|
struct protosw in_gif_protosw = {
|
|
.pr_type = SOCK_RAW,
|
|
.pr_domain = &inetdomain,
|
|
.pr_protocol = 0/* IPPROTO_IPV[46] */,
|
|
.pr_flags = PR_ATOMIC|PR_ADDR,
|
|
.pr_input = in_gif_input,
|
|
.pr_output = rip_output,
|
|
.pr_ctloutput = rip_ctloutput,
|
|
.pr_usrreqs = &rip_usrreqs
|
|
};
|
|
|
|
VNET_DEFINE(int, ip_gif_ttl) = GIF_TTL;
|
|
#define V_ip_gif_ttl VNET(ip_gif_ttl)
|
|
SYSCTL_VNET_INT(_net_inet_ip, IPCTL_GIF_TTL, gifttl, CTLFLAG_RW,
|
|
&VNET_NAME(ip_gif_ttl), 0, "");
|
|
|
|
int
|
|
in_gif_output(struct ifnet *ifp, struct mbuf *m, int proto, uint8_t ecn)
|
|
{
|
|
GIF_RLOCK_TRACKER;
|
|
struct gif_softc *sc = ifp->if_softc;
|
|
struct ip *ip;
|
|
int len;
|
|
|
|
/* prepend new IP header */
|
|
len = sizeof(struct ip);
|
|
#ifndef __NO_STRICT_ALIGNMENT
|
|
if (proto == IPPROTO_ETHERIP)
|
|
len += ETHERIP_ALIGN;
|
|
#endif
|
|
M_PREPEND(m, len, M_NOWAIT);
|
|
if (m == NULL)
|
|
return (ENOBUFS);
|
|
#ifndef __NO_STRICT_ALIGNMENT
|
|
if (proto == IPPROTO_ETHERIP) {
|
|
len = mtod(m, vm_offset_t) & 3;
|
|
KASSERT(len == 0 || len == ETHERIP_ALIGN,
|
|
("in_gif_output: unexpected misalignment"));
|
|
m->m_data += len;
|
|
m->m_len -= ETHERIP_ALIGN;
|
|
}
|
|
#endif
|
|
ip = mtod(m, struct ip *);
|
|
GIF_RLOCK(sc);
|
|
if (sc->gif_family != AF_INET) {
|
|
m_freem(m);
|
|
GIF_RUNLOCK(sc);
|
|
return (ENETDOWN);
|
|
}
|
|
bcopy(sc->gif_iphdr, ip, sizeof(struct ip));
|
|
GIF_RUNLOCK(sc);
|
|
|
|
ip->ip_p = proto;
|
|
/* version will be set in ip_output() */
|
|
ip->ip_ttl = V_ip_gif_ttl;
|
|
ip->ip_len = htons(m->m_pkthdr.len);
|
|
ip->ip_tos = ecn;
|
|
|
|
return (ip_output(m, NULL, NULL, 0, NULL, NULL));
|
|
}
|
|
|
|
int
|
|
in_gif_input(struct mbuf **mp, int *offp, int proto)
|
|
{
|
|
struct mbuf *m = *mp;
|
|
struct gif_softc *sc;
|
|
struct ifnet *gifp;
|
|
struct ip *ip;
|
|
uint8_t ecn;
|
|
|
|
sc = encap_getarg(m);
|
|
if (sc == NULL) {
|
|
m_freem(m);
|
|
KMOD_IPSTAT_INC(ips_nogif);
|
|
return (IPPROTO_DONE);
|
|
}
|
|
gifp = GIF2IFP(sc);
|
|
if ((gifp->if_flags & IFF_UP) != 0) {
|
|
ip = mtod(m, struct ip *);
|
|
ecn = ip->ip_tos;
|
|
m_adj(m, *offp);
|
|
gif_input(m, gifp, proto, ecn);
|
|
} else {
|
|
m_freem(m);
|
|
KMOD_IPSTAT_INC(ips_nogif);
|
|
}
|
|
return (IPPROTO_DONE);
|
|
}
|
|
|
|
/*
|
|
* validate outer address.
|
|
*/
|
|
static int
|
|
gif_validate4(const struct ip *ip, struct gif_softc *sc, struct ifnet *ifp)
|
|
{
|
|
|
|
GIF_RLOCK_ASSERT(sc);
|
|
|
|
/* check for address match */
|
|
if (sc->gif_iphdr->ip_src.s_addr != ip->ip_dst.s_addr ||
|
|
sc->gif_iphdr->ip_dst.s_addr != ip->ip_src.s_addr)
|
|
return (0);
|
|
|
|
/* martian filters on outer source - NOT done in ip_input! */
|
|
if (IN_MULTICAST(ntohl(ip->ip_src.s_addr)))
|
|
return (0);
|
|
switch ((ntohl(ip->ip_src.s_addr) & 0xff000000) >> 24) {
|
|
case 0:
|
|
case 127:
|
|
case 255:
|
|
return (0);
|
|
}
|
|
|
|
/* ingress filters on outer source */
|
|
if ((GIF2IFP(sc)->if_flags & IFF_LINK2) == 0 && ifp) {
|
|
struct nhop4_basic nh4;
|
|
uint32_t fibnum;
|
|
|
|
fibnum = sc->gif_fibnum;
|
|
|
|
if (fib4_lookup_nh_basic(fibnum, ip->ip_src, 0, &nh4) != 0)
|
|
return (0);
|
|
if (nh4.nh_ifp != ifp)
|
|
return (0);
|
|
}
|
|
return (32 * 2);
|
|
}
|
|
|
|
/*
|
|
* we know that we are in IFF_UP, outer address available, and outer family
|
|
* matched the physical addr family. see gif_encapcheck().
|
|
*/
|
|
int
|
|
in_gif_encapcheck(const struct mbuf *m, int off, int proto, void *arg)
|
|
{
|
|
struct ip ip;
|
|
struct gif_softc *sc;
|
|
struct ifnet *ifp;
|
|
|
|
/* sanity check done in caller */
|
|
sc = (struct gif_softc *)arg;
|
|
GIF_RLOCK_ASSERT(sc);
|
|
|
|
m_copydata(m, 0, sizeof(ip), (caddr_t)&ip);
|
|
ifp = ((m->m_flags & M_PKTHDR) != 0) ? m->m_pkthdr.rcvif : NULL;
|
|
return (gif_validate4(&ip, sc, ifp));
|
|
}
|
|
|
|
int
|
|
in_gif_attach(struct gif_softc *sc)
|
|
{
|
|
|
|
KASSERT(sc->gif_ecookie == NULL, ("gif_ecookie isn't NULL"));
|
|
sc->gif_ecookie = encap_attach_func(AF_INET, -1, gif_encapcheck,
|
|
&in_gif_protosw, sc);
|
|
if (sc->gif_ecookie == NULL)
|
|
return (EEXIST);
|
|
return (0);
|
|
}
|