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/*-
* 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_var.h>
#include <netinet/ip_encap.h>
#include <netinet/ip_ecn.h>
#include <netinet/in_fib.h>
#ifdef INET6
#include <netinet/ip6.h>
#endif
#include <net/if_gif.h>
static int in_gif_input(struct mbuf **, int *, int);
extern struct domain inetdomain;
static 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
};
#define GIF_TTL 30
static VNET_DEFINE(int, ip_gif_ttl) = GIF_TTL;
#define V_ip_gif_ttl VNET(ip_gif_ttl)
SYSCTL_INT(_net_inet_ip, IPCTL_GIF_TTL, gifttl, CTLFLAG_VNET | 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));
}
static 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);
}
/*
* 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)
{
const struct ip *ip;
struct gif_softc *sc;
int ret;
/* sanity check done in caller */
sc = (struct gif_softc *)arg;
GIF_RLOCK_ASSERT(sc);
/* check for address match */
ip = mtod(m, const struct ip *);
if (sc->gif_iphdr->ip_src.s_addr != ip->ip_dst.s_addr)
return (0);
ret = 32;
if (sc->gif_iphdr->ip_dst.s_addr != ip->ip_src.s_addr) {
if ((sc->gif_options & GIF_IGNORE_SOURCE) == 0)
return (0);
} else
ret += 32;
/* ingress filters on outer source */
if ((GIF2IFP(sc)->if_flags & IFF_LINK2) == 0) {
struct nhop4_basic nh4;
struct in_addr dst;
dst = ip->ip_src;
if (fib4_lookup_nh_basic(sc->gif_fibnum, dst, 0, 0, &nh4) != 0)
return (0);
if (nh4.nh_ifp != m->m_pkthdr.rcvif)
return (0);
}
return (ret);
}
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);
}
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