217 lines
5.8 KiB
C
217 lines
5.8 KiB
C
/*-
|
|
* Copyright 1994, 1995 Massachusetts Institute of Technology
|
|
*
|
|
* Permission to use, copy, modify, and distribute this software and
|
|
* its documentation for any purpose and without fee is hereby
|
|
* granted, provided that both the above copyright notice and this
|
|
* permission notice appear in all copies, that both the above
|
|
* copyright notice and this permission notice appear in all
|
|
* supporting documentation, and that the name of M.I.T. not be used
|
|
* in advertising or publicity pertaining to distribution of the
|
|
* software without specific, written prior permission. M.I.T. makes
|
|
* no representations about the suitability of this software for any
|
|
* purpose. It is provided "as is" without express or implied
|
|
* warranty.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS
|
|
* ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
|
|
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
|
|
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
|
|
* SHALL M.I.T. 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 <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/sysctl.h>
|
|
#include <sys/socket.h>
|
|
#include <sys/mbuf.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_var.h>
|
|
#include <netinet/ip.h>
|
|
#include <netinet/ip_icmp.h>
|
|
#include <netinet/ip_var.h>
|
|
|
|
extern int in_inithead(void **head, int off);
|
|
#ifdef VIMAGE
|
|
extern int in_detachhead(void **head, int off);
|
|
#endif
|
|
|
|
/*
|
|
* Do what we need to do when inserting a route.
|
|
*/
|
|
static struct radix_node *
|
|
in_addroute(void *v_arg, void *n_arg, struct radix_node_head *head,
|
|
struct radix_node *treenodes)
|
|
{
|
|
struct rtentry *rt = (struct rtentry *)treenodes;
|
|
struct sockaddr_in *sin = (struct sockaddr_in *)rt_key(rt);
|
|
|
|
RADIX_NODE_HEAD_WLOCK_ASSERT(head);
|
|
/*
|
|
* A little bit of help for both IP output and input:
|
|
* For host routes, we make sure that RTF_BROADCAST
|
|
* is set for anything that looks like a broadcast address.
|
|
* This way, we can avoid an expensive call to in_broadcast()
|
|
* in ip_output() most of the time (because the route passed
|
|
* to ip_output() is almost always a host route).
|
|
*
|
|
* We also do the same for local addresses, with the thought
|
|
* that this might one day be used to speed up ip_input().
|
|
*
|
|
* We also mark routes to multicast addresses as such, because
|
|
* it's easy to do and might be useful (but this is much more
|
|
* dubious since it's so easy to inspect the address).
|
|
*/
|
|
if (rt->rt_flags & RTF_HOST) {
|
|
if (in_broadcast(sin->sin_addr, rt->rt_ifp)) {
|
|
rt->rt_flags |= RTF_BROADCAST;
|
|
} else if (satosin(rt->rt_ifa->ifa_addr)->sin_addr.s_addr ==
|
|
sin->sin_addr.s_addr) {
|
|
rt->rt_flags |= RTF_LOCAL;
|
|
}
|
|
}
|
|
if (IN_MULTICAST(ntohl(sin->sin_addr.s_addr)))
|
|
rt->rt_flags |= RTF_MULTICAST;
|
|
|
|
if (rt->rt_ifp != NULL) {
|
|
|
|
/*
|
|
* Check route MTU:
|
|
* inherit interface MTU if not set or
|
|
* check if MTU is too large.
|
|
*/
|
|
if (rt->rt_mtu == 0) {
|
|
rt->rt_mtu = rt->rt_ifp->if_mtu;
|
|
} else if (rt->rt_mtu > rt->rt_ifp->if_mtu)
|
|
rt->rt_mtu = rt->rt_ifp->if_mtu;
|
|
}
|
|
|
|
return (rn_addroute(v_arg, n_arg, head, treenodes));
|
|
}
|
|
|
|
static int _in_rt_was_here;
|
|
/*
|
|
* Initialize our routing tree.
|
|
*/
|
|
int
|
|
in_inithead(void **head, int off)
|
|
{
|
|
struct radix_node_head *rnh;
|
|
|
|
if (!rn_inithead(head, 32))
|
|
return 0;
|
|
|
|
rnh = *head;
|
|
RADIX_NODE_HEAD_LOCK_INIT(rnh);
|
|
|
|
rnh->rnh_addaddr = in_addroute;
|
|
if (_in_rt_was_here == 0 ) {
|
|
_in_rt_was_here = 1;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
#ifdef VIMAGE
|
|
int
|
|
in_detachhead(void **head, int off)
|
|
{
|
|
|
|
return (1);
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* This zaps old routes when the interface goes down or interface
|
|
* address is deleted. In the latter case, it deletes static routes
|
|
* that point to this address. If we don't do this, we may end up
|
|
* using the old address in the future. The ones we always want to
|
|
* get rid of are things like ARP entries, since the user might down
|
|
* the interface, walk over to a completely different network, and
|
|
* plug back in.
|
|
*/
|
|
struct in_ifadown_arg {
|
|
struct ifaddr *ifa;
|
|
int del;
|
|
};
|
|
|
|
static int
|
|
in_ifadownkill(const struct rtentry *rt, void *xap)
|
|
{
|
|
struct in_ifadown_arg *ap = xap;
|
|
|
|
if (rt->rt_ifa != ap->ifa)
|
|
return (0);
|
|
|
|
if ((rt->rt_flags & RTF_STATIC) != 0 && ap->del == 0)
|
|
return (0);
|
|
|
|
return (1);
|
|
}
|
|
|
|
void
|
|
in_ifadown(struct ifaddr *ifa, int delete)
|
|
{
|
|
struct in_ifadown_arg arg;
|
|
|
|
KASSERT(ifa->ifa_addr->sa_family == AF_INET,
|
|
("%s: wrong family", __func__));
|
|
|
|
arg.ifa = ifa;
|
|
arg.del = delete;
|
|
|
|
rt_foreach_fib_walk_del(AF_INET, in_ifadownkill, &arg);
|
|
ifa->ifa_flags &= ~IFA_ROUTE; /* XXXlocking? */
|
|
}
|
|
|
|
/*
|
|
* inet versions of rt functions. These have fib extensions and
|
|
* for now will just reference the _fib variants.
|
|
* eventually this order will be reversed,
|
|
*/
|
|
void
|
|
in_rtalloc_ign(struct route *ro, u_long ignflags, u_int fibnum)
|
|
{
|
|
rtalloc_ign_fib(ro, ignflags, fibnum);
|
|
}
|
|
|
|
struct rtentry *
|
|
in_rtalloc1(struct sockaddr *dst, int report, u_long ignflags, u_int fibnum)
|
|
{
|
|
return (rtalloc1_fib(dst, report, ignflags, fibnum));
|
|
}
|
|
|
|
void
|
|
in_rtredirect(struct sockaddr *dst,
|
|
struct sockaddr *gateway,
|
|
struct sockaddr *netmask,
|
|
int flags,
|
|
struct sockaddr *src,
|
|
u_int fibnum)
|
|
{
|
|
rtredirect_fib(dst, gateway, netmask, flags, src, fibnum);
|
|
}
|
|
|
|
void
|
|
in_rtalloc(struct route *ro, u_int fibnum)
|
|
{
|
|
rtalloc_ign_fib(ro, 0UL, fibnum);
|
|
}
|
|
|