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/* $OpenBSD: nd6_rtr.c,v 1.167 2019/06/21 17:11:43 mpi Exp $ */
/* $KAME: nd6_rtr.c,v 1.97 2001/02/07 11:09:13 itojun Exp $ */
/*
* 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.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/timeout.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <sys/time.h>
#include <sys/kernel.h>
#include <sys/errno.h>
#include <sys/ioctl.h>
#include <sys/syslog.h>
#include <sys/queue.h>
#include <net/if.h>
#include <net/if_dl.h>
#include <net/if_var.h>
#include <net/route.h>
#include <net/rtable.h>
#include <netinet/in.h>
#include <netinet6/in6_var.h>
#include <netinet/ip6.h>
#include <netinet6/ip6_var.h>
#include <netinet6/nd6.h>
#include <netinet/icmp6.h>
int rt6_deleteroute(struct rtentry *, void *, unsigned int);
/*
* Process Source Link-layer Address Options from
* Router Solicitation / Advertisement Messages.
*/
void
nd6_rtr_cache(struct mbuf *m, int off, int icmp6len, int icmp6_type)
{
struct ifnet *ifp;
struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
struct nd_router_solicit *nd_rs;
struct nd_router_advert *nd_ra;
struct in6_addr saddr6 = ip6->ip6_src;
char *lladdr = NULL;
int lladdrlen = 0;
union nd_opts ndopts;
char src[INET6_ADDRSTRLEN], dst[INET6_ADDRSTRLEN];
KASSERT(icmp6_type == ND_ROUTER_SOLICIT || icmp6_type ==
ND_ROUTER_ADVERT);
/* Sanity checks */
if (ip6->ip6_hlim != 255) {
nd6log((LOG_ERR,
"%s: invalid hlim (%d) from %s to %s on %u\n",
__func__, ip6->ip6_hlim,
inet_ntop(AF_INET6, &ip6->ip6_src, src, sizeof(src)),
inet_ntop(AF_INET6, &ip6->ip6_dst, dst, sizeof(dst)),
m->m_pkthdr.ph_ifidx));
goto bad;
}
switch (icmp6_type) {
case ND_ROUTER_SOLICIT:
/*
* Don't update the neighbor cache, if src = ::.
* This indicates that the src has no IP address assigned yet.
*/
if (IN6_IS_ADDR_UNSPECIFIED(&saddr6))
goto freeit;
IP6_EXTHDR_GET(nd_rs, struct nd_router_solicit *, m, off,
icmp6len);
if (nd_rs == NULL) {
icmp6stat_inc(icp6s_tooshort);
return;
}
icmp6len -= sizeof(*nd_rs);
nd6_option_init(nd_rs + 1, icmp6len, &ndopts);
break;
case ND_ROUTER_ADVERT:
if (!IN6_IS_ADDR_LINKLOCAL(&saddr6)) {
nd6log((LOG_ERR,
"%s: src %s is not link-local\n", __func__,
inet_ntop(AF_INET6, &saddr6, src, sizeof(src))));
goto bad;
}
IP6_EXTHDR_GET(nd_ra, struct nd_router_advert *, m, off,
icmp6len);
if (nd_ra == NULL) {
icmp6stat_inc(icp6s_tooshort);
return;
}
icmp6len -= sizeof(*nd_ra);
nd6_option_init(nd_ra + 1, icmp6len, &ndopts);
break;
}
if (nd6_options(&ndopts) < 0) {
nd6log((LOG_INFO,
"%s: invalid ND option, ignored\n", __func__));
/* nd6_options have incremented stats */
goto freeit;
}
if (ndopts.nd_opts_src_lladdr) {
lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1);
lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
}
ifp = if_get(m->m_pkthdr.ph_ifidx);
if (ifp == NULL)
goto freeit;
if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
nd6log((LOG_INFO,
"%s: lladdrlen mismatch for %s (if %d, RA/RS packet %d)\n",
__func__, inet_ntop(AF_INET6, &saddr6, src, sizeof(src)),
ifp->if_addrlen, lladdrlen - 2));
if_put(ifp);
goto bad;
}
nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, icmp6_type, 0);
if_put(ifp);
freeit:
m_freem(m);
return;
bad:
icmp6stat_inc(icmp6_type == ND_ROUTER_SOLICIT ? icp6s_badrs :
icp6s_badra);
m_freem(m);
}
/*
* Delete all the routing table entries that use the specified gateway.
* XXX: this function causes search through all entries of routing table, so
* it shouldn't be called when acting as a router.
* The gateway must already contain KAME's hack for link-local scope.
*/
int
rt6_flush(struct in6_addr *gateway, struct ifnet *ifp)
{
struct rt_addrinfo info;
struct sockaddr_in6 sa_mask;
struct rtentry *rt = NULL;
int error;
NET_ASSERT_LOCKED();
/* We'll care only link-local addresses */
if (!IN6_IS_ADDR_LINKLOCAL(gateway))
return (0);
KASSERT(gateway->s6_addr16[1] != 0);
do {
error = rtable_walk(ifp->if_rdomain, AF_INET6, &rt,
rt6_deleteroute, gateway);
if (rt != NULL && error == EEXIST) {
memset(&info, 0, sizeof(info));
info.rti_flags = rt->rt_flags;
info.rti_info[RTAX_DST] = rt_key(rt);
info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
info.rti_info[RTAX_NETMASK] = rt_plen2mask(rt,
&sa_mask);
error = rtrequest_delete(&info, RTP_ANY, ifp, NULL,
ifp->if_rdomain);
if (error == 0)
error = EAGAIN;
}
rtfree(rt);
rt = NULL;
} while (error == EAGAIN);
return (error);
}
int
rt6_deleteroute(struct rtentry *rt, void *arg, unsigned int id)
{
struct in6_addr *gate = (struct in6_addr *)arg;
if (rt->rt_gateway == NULL || rt->rt_gateway->sa_family != AF_INET6)
return (0);
if (!IN6_ARE_ADDR_EQUAL(gate, &satosin6(rt->rt_gateway)->sin6_addr))
return (0);
/*
* Do not delete a static route.
* XXX: this seems to be a bit ad-hoc. Should we consider the
* 'cloned' bit instead?
*/
if ((rt->rt_flags & RTF_STATIC) != 0)
return (0);
/*
* We delete only host route. This means, in particular, we don't
* delete default route.
*/
if ((rt->rt_flags & RTF_HOST) == 0)
return (0);
return (EEXIST);
}
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