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