/*-
* Copyright (c) 2014 Andrey V. Elsukov <ae@FreeBSD.org>
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*/
#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/queue.h>
#include <sys/syslog.h>
#include <sys/sysctl.h>
#include <sys/protosw.h>
#include <sys/malloc.h>
#include <net/if.h>
#include <net/if_var.h>
#include <net/vnet.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#ifdef INET
#include <net/ethernet.h>
#include <netinet/ip.h>
#endif
#include <netinet/ip_encap.h>
#include <netinet/ip6.h>
#include <netinet6/ip6_var.h>
#include <netinet6/in6_var.h>
#include <net/if_gre.h>
extern struct domain inet6domain;
struct protosw in6_gre_protosw = {
.pr_type = SOCK_RAW,
.pr_domain = &inet6domain,
.pr_protocol = IPPROTO_GRE,
.pr_flags = PR_ATOMIC|PR_ADDR,
.pr_input = gre_input,
.pr_output = rip6_output,
.pr_ctloutput = rip6_ctloutput,
.pr_usrreqs = &rip6_usrreqs
};
VNET_DEFINE(int, ip6_gre_hlim) = IPV6_DEFHLIM;
#define V_ip6_gre_hlim VNET(ip6_gre_hlim)
SYSCTL_DECL(_net_inet6_ip6);
SYSCTL_INT(_net_inet6_ip6, OID_AUTO, grehlim, CTLFLAG_VNET | CTLFLAG_RW,
&VNET_NAME(ip6_gre_hlim), 0, "Default hop limit for encapsulated packets");
static int
in6_gre_encapcheck(const struct mbuf *m, int off, int proto, void *arg)
{
GRE_RLOCK_TRACKER;
struct gre_softc *sc;
struct ip6_hdr *ip6;
sc = (struct gre_softc *)arg;
if ((GRE2IFP(sc)->if_flags & IFF_UP) == 0)
return (0);
M_ASSERTPKTHDR(m);
/*
* We expect that payload contains at least IPv4
* or IPv6 packet.
*/
if (m->m_pkthdr.len < sizeof(struct greip6) +
#ifdef INET
sizeof(struct ip))
#else
sizeof(struct ip6_hdr))
#endif
return (0);
GRE_RLOCK(sc);
if (sc->gre_family == 0)
goto bad;
KASSERT(sc->gre_family == AF_INET6,
("wrong gre_family: %d", sc->gre_family));
ip6 = mtod(m, struct ip6_hdr *);
if (!IN6_ARE_ADDR_EQUAL(&sc->gre_oip6.ip6_src, &ip6->ip6_dst) ||
!IN6_ARE_ADDR_EQUAL(&sc->gre_oip6.ip6_dst, &ip6->ip6_src))
goto bad;
GRE_RUNLOCK(sc);
return (128 * 2);
bad:
GRE_RUNLOCK(sc);
return (0);
}
int
in6_gre_output(struct mbuf *m, int af, int hlen)
{
struct greip6 *gi6;
gi6 = mtod(m, struct greip6 *);
gi6->gi6_ip6.ip6_hlim = V_ip6_gre_hlim;
return (ip6_output(m, NULL, NULL, IPV6_MINMTU, NULL, NULL, NULL));
}
int
in6_gre_attach(struct gre_softc *sc)
{
KASSERT(sc->gre_ecookie == NULL, ("gre_ecookie isn't NULL"));
sc->gre_ecookie = encap_attach_func(AF_INET6, IPPROTO_GRE,
in6_gre_encapcheck, &in6_gre_protosw, sc);
if (sc->gre_ecookie == NULL)
return (EEXIST);
return (0);
}
