8420966a4f
delete them when the ``parent'' goes away route.h: add glue to track this to rtentry structure. WARNING WILL ROBINSON! This will be yet another incompatible change in your route-using binaries. I apologize, but this was the only way to do it. I took this opportunity to increase the size of the metrics to what I believe will be the final length for 2.1, so that when the T/TCP stuff is done, this won't happen again.
628 lines
16 KiB
C
628 lines
16 KiB
C
/*
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* Copyright (c) 1980, 1986, 1991, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT 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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* @(#)route.c 8.2 (Berkeley) 11/15/93
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* $Id: route.c,v 1.13 1994/12/13 23:07:03 wollman Exp $
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*/
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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/proc.h>
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#include <sys/mbuf.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/domain.h>
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#include <sys/protosw.h>
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#include <sys/ioctl.h>
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#include <net/if.h>
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#include <net/route.h>
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#include <net/raw_cb.h>
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#include <netinet/in.h>
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#include <netinet/in_var.h>
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#ifdef NS
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#include <netns/ns.h>
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#endif
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#define SA(p) ((struct sockaddr *)(p))
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int rttrash; /* routes not in table but not freed */
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struct sockaddr wildcard; /* zero valued cookie for wildcard searches */
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void
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rtable_init(table)
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void **table;
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{
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struct domain *dom;
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for (dom = domains; dom; dom = dom->dom_next)
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if (dom->dom_rtattach)
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dom->dom_rtattach(&table[dom->dom_family],
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dom->dom_rtoffset);
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}
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void
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route_init()
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{
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rn_init(); /* initialize all zeroes, all ones, mask table */
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rtable_init((void **)rt_tables);
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}
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/*
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* Packet routing routines.
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*/
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void
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rtalloc(ro)
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register struct route *ro;
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{
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if (ro->ro_rt && ro->ro_rt->rt_ifp && (ro->ro_rt->rt_flags & RTF_UP))
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return; /* XXX */
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ro->ro_rt = rtalloc1(&ro->ro_dst, 1, 0UL);
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}
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void
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rtalloc_ign(ro, ignore)
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register struct route *ro;
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u_long ignore;
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{
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if (ro->ro_rt && ro->ro_rt->rt_ifp && (ro->ro_rt->rt_flags & RTF_UP))
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return; /* XXX */
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ro->ro_rt = rtalloc1(&ro->ro_dst, 1, ignore);
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}
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struct rtentry *
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rtalloc1(dst, report, ignflags)
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register struct sockaddr *dst;
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int report;
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u_long ignflags;
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{
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register struct radix_node_head *rnh = rt_tables[dst->sa_family];
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register struct rtentry *rt;
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register struct radix_node *rn;
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struct rtentry *newrt = 0;
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struct rt_addrinfo info;
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u_long nflags;
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int s = splnet(), err = 0, msgtype = RTM_MISS;
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if (rnh && (rn = rnh->rnh_matchaddr((caddr_t)dst, rnh)) &&
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((rn->rn_flags & RNF_ROOT) == 0)) {
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newrt = rt = (struct rtentry *)rn;
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nflags = rt->rt_flags & ~ignflags;
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if (report && (nflags & (RTF_CLONING | RTF_PRCLONING))) {
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err = rtrequest(RTM_RESOLVE, dst, SA(0),
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SA(0), 0, &newrt);
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if (err) {
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newrt = rt;
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rt->rt_refcnt++;
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goto miss;
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}
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if ((rt = newrt) && (rt->rt_flags & RTF_XRESOLVE)) {
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msgtype = RTM_RESOLVE;
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goto miss;
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}
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} else
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rt->rt_refcnt++;
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} else {
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rtstat.rts_unreach++;
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miss: if (report) {
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bzero((caddr_t)&info, sizeof(info));
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info.rti_info[RTAX_DST] = dst;
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rt_missmsg(msgtype, &info, 0, err);
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}
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}
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splx(s);
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return (newrt);
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}
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void
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rtfree(rt)
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register struct rtentry *rt;
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{
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register struct radix_node_head *rnh =
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rt_tables[rt_key(rt)->sa_family];
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register struct ifaddr *ifa;
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if (rt == 0)
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panic("rtfree");
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rt->rt_refcnt--;
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if(rnh->rnh_close && rt->rt_refcnt == 0) {
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rnh->rnh_close((struct radix_node *)rt, rnh);
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}
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if (rt->rt_refcnt <= 0 && (rt->rt_flags & RTF_UP) == 0) {
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if (rt->rt_nodes->rn_flags & (RNF_ACTIVE | RNF_ROOT))
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panic ("rtfree 2");
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rttrash--;
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if (rt->rt_refcnt < 0) {
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printf("rtfree: %p not freed (neg refs)\n", rt);
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return;
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}
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ifa = rt->rt_ifa;
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IFAFREE(ifa);
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Free(rt_key(rt));
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Free(rt);
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}
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}
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void
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ifafree(ifa)
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register struct ifaddr *ifa;
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{
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if (ifa == NULL)
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panic("ifafree");
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if (ifa->ifa_refcnt == 0)
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free(ifa, M_IFADDR);
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else
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ifa->ifa_refcnt--;
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}
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/*
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* Force a routing table entry to the specified
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* destination to go through the given gateway.
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* Normally called as a result of a routing redirect
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* message from the network layer.
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*
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* N.B.: must be called at splnet
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*
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*/
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void
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rtredirect(dst, gateway, netmask, flags, src, rtp)
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struct sockaddr *dst, *gateway, *netmask, *src;
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int flags;
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struct rtentry **rtp;
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{
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register struct rtentry *rt;
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int error = 0;
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short *stat = 0;
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struct rt_addrinfo info;
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struct ifaddr *ifa;
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/* verify the gateway is directly reachable */
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if ((ifa = ifa_ifwithnet(gateway)) == 0) {
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error = ENETUNREACH;
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goto out;
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}
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rt = rtalloc1(dst, 0, 0UL);
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/*
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* If the redirect isn't from our current router for this dst,
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* it's either old or wrong. If it redirects us to ourselves,
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* we have a routing loop, perhaps as a result of an interface
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* going down recently.
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*/
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#define equal(a1, a2) (bcmp((caddr_t)(a1), (caddr_t)(a2), (a1)->sa_len) == 0)
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if (!(flags & RTF_DONE) && rt &&
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(!equal(src, rt->rt_gateway) || rt->rt_ifa != ifa))
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error = EINVAL;
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else if (ifa_ifwithaddr(gateway))
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error = EHOSTUNREACH;
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if (error)
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goto done;
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/*
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* Create a new entry if we just got back a wildcard entry
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* or the the lookup failed. This is necessary for hosts
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* which use routing redirects generated by smart gateways
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* to dynamically build the routing tables.
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*/
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if ((rt == 0) || (rt_mask(rt) && rt_mask(rt)->sa_len < 2))
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goto create;
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/*
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* Don't listen to the redirect if it's
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* for a route to an interface.
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*/
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if (rt->rt_flags & RTF_GATEWAY) {
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if (((rt->rt_flags & RTF_HOST) == 0) && (flags & RTF_HOST)) {
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/*
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* Changing from route to net => route to host.
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* Create new route, rather than smashing route to net.
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*/
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create:
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flags |= RTF_GATEWAY | RTF_DYNAMIC;
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error = rtrequest((int)RTM_ADD, dst, gateway,
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netmask, flags,
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(struct rtentry **)0);
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stat = &rtstat.rts_dynamic;
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} else {
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/*
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* Smash the current notion of the gateway to
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* this destination. Should check about netmask!!!
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*/
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rt->rt_flags |= RTF_MODIFIED;
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flags |= RTF_MODIFIED;
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stat = &rtstat.rts_newgateway;
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rt_setgate(rt, rt_key(rt), gateway);
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}
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} else
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error = EHOSTUNREACH;
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done:
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if (rt) {
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if (rtp && !error)
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*rtp = rt;
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else
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rtfree(rt);
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}
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out:
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if (error)
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rtstat.rts_badredirect++;
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else if (stat != NULL)
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(*stat)++;
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bzero((caddr_t)&info, sizeof(info));
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info.rti_info[RTAX_DST] = dst;
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info.rti_info[RTAX_GATEWAY] = gateway;
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info.rti_info[RTAX_NETMASK] = netmask;
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info.rti_info[RTAX_AUTHOR] = src;
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rt_missmsg(RTM_REDIRECT, &info, flags, error);
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}
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/*
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* Routing table ioctl interface.
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*/
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int
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rtioctl(req, data, p)
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int req;
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caddr_t data;
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struct proc *p;
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{
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#ifdef INET
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extern int (*mrt_ioctl)(int, caddr_t, struct proc *);
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/* Multicast goop, grrr... */
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return mrt_ioctl(req, data, p);
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#else /* INET */
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return ENXIO;
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#endif /* INET */
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}
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struct ifaddr *
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ifa_ifwithroute(flags, dst, gateway)
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int flags;
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struct sockaddr *dst, *gateway;
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{
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register struct ifaddr *ifa;
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if ((flags & RTF_GATEWAY) == 0) {
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/*
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* If we are adding a route to an interface,
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* and the interface is a pt to pt link
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* we should search for the destination
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* as our clue to the interface. Otherwise
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* we can use the local address.
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*/
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ifa = 0;
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if (flags & RTF_HOST) {
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ifa = ifa_ifwithdstaddr(dst);
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}
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if (ifa == 0)
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ifa = ifa_ifwithaddr(gateway);
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} else {
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/*
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* If we are adding a route to a remote net
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* or host, the gateway may still be on the
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* other end of a pt to pt link.
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*/
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ifa = ifa_ifwithdstaddr(gateway);
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}
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if (ifa == 0)
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ifa = ifa_ifwithnet(gateway);
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if (ifa == 0) {
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struct rtentry *rt = rtalloc1(dst, 0, 0UL);
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if (rt == 0)
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return (0);
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rt->rt_refcnt--;
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if ((ifa = rt->rt_ifa) == 0)
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return (0);
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}
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if (ifa->ifa_addr->sa_family != dst->sa_family) {
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struct ifaddr *oifa = ifa;
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ifa = ifaof_ifpforaddr(dst, ifa->ifa_ifp);
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if (ifa == 0)
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ifa = oifa;
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}
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return (ifa);
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}
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#define ROUNDUP(a) (a>0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long))
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static void rt_fixfamily(struct rtentry *rt);
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int
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rtrequest(req, dst, gateway, netmask, flags, ret_nrt)
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int req, flags;
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struct sockaddr *dst, *gateway, *netmask;
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struct rtentry **ret_nrt;
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{
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int s = splnet(); int error = 0;
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register struct rtentry *rt;
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register struct radix_node *rn;
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register struct radix_node_head *rnh;
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struct ifaddr *ifa;
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struct sockaddr *ndst;
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u_long prflags = 0UL;
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#define senderr(x) { error = x ; goto bad; }
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if ((rnh = rt_tables[dst->sa_family]) == 0)
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senderr(ESRCH);
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if (flags & RTF_HOST)
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netmask = 0;
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switch (req) {
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case RTM_DELETE:
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if ((rn = rnh->rnh_deladdr(dst, netmask, rnh)) == 0)
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senderr(ESRCH);
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if (rn->rn_flags & (RNF_ACTIVE | RNF_ROOT))
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panic ("rtrequest delete");
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rt = (struct rtentry *)rn;
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rt->rt_flags &= ~RTF_UP;
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rt_fixfamily(rt);
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if (rt->rt_gwroute) {
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rt = rt->rt_gwroute; RTFREE(rt);
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(rt = (struct rtentry *)rn)->rt_gwroute = 0;
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}
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if ((ifa = rt->rt_ifa) && ifa->ifa_rtrequest)
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ifa->ifa_rtrequest(RTM_DELETE, rt, SA(0));
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rttrash++;
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if (ret_nrt)
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*ret_nrt = rt;
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else if (rt->rt_refcnt <= 0) {
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rt->rt_refcnt++;
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rtfree(rt);
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}
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break;
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case RTM_RESOLVE:
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if (ret_nrt == 0 || (rt = *ret_nrt) == 0)
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senderr(EINVAL);
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ifa = rt->rt_ifa;
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flags = rt->rt_flags & ~(RTF_CLONING | RTF_PRCLONING);
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flags |= RTF_WASCLONED;
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gateway = rt->rt_gateway;
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if ((netmask = rt->rt_genmask) == 0)
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flags |= RTF_HOST;
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if (flags & RTF_STATIC) {
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flags &= ~RTF_STATIC;
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}
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goto makeroute;
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case RTM_ADD:
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if ((flags & RTF_GATEWAY) && !gateway)
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panic("rtrequest: GATEWAY but no gateway");
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if ((ifa = ifa_ifwithroute(flags, dst, gateway)) == 0)
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senderr(ENETUNREACH);
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makeroute:
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R_Malloc(rt, struct rtentry *, sizeof(*rt));
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if (rt == 0)
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senderr(ENOBUFS);
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Bzero(rt, sizeof(*rt));
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rt->rt_flags = RTF_UP | flags;
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if (rt_setgate(rt, dst, gateway)) {
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Free(rt);
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senderr(ENOBUFS);
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}
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ndst = rt_key(rt);
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if (netmask) {
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rt_maskedcopy(dst, ndst, netmask);
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} else
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Bcopy(dst, ndst, dst->sa_len);
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rn = rnh->rnh_addaddr((caddr_t)ndst, (caddr_t)netmask,
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rnh, rt->rt_nodes);
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if (rn == 0) {
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if (rt->rt_gwroute)
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rtfree(rt->rt_gwroute);
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Free(rt_key(rt));
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Free(rt);
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senderr(EEXIST);
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}
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ifa->ifa_refcnt++;
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rt->rt_ifa = ifa;
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rt->rt_ifp = ifa->ifa_ifp;
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if (req == RTM_RESOLVE)
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rt->rt_rmx = (*ret_nrt)->rt_rmx; /* copy metrics */
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if ((req == RTM_RESOLVE)
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&& ((*ret_nrt)->rt_flags & RTF_PRCLONING)) {
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rt->rt_parent = (*ret_nrt);
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rt->rt_nextchild = (*ret_nrt)->rt_nextchild;
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(*ret_nrt)->rt_nextchild = rt;
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}
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if (ifa->ifa_rtrequest)
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ifa->ifa_rtrequest(req, rt, SA(ret_nrt ? *ret_nrt : 0));
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if (ret_nrt) {
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*ret_nrt = rt;
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rt->rt_refcnt++;
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}
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break;
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}
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bad:
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splx(s);
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return (error);
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}
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|
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/*
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* Called from rtrequest(RTM_DELETE, ...) to fix up the route's ``family''
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* (i.e., the routes related to it by the operation of cloning). This
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* involves deleting the entire chain of descendants (in the case of a parent
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* route being deleted), or removing this route from the chain (in the case
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* of a child route being deleted).
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*/
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static void
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rt_fixfamily(struct rtentry *rt0)
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{
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struct rtentry *rt, *lrt, *nrt;
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|
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if(rt = rt0->rt_parent) {
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if(rt->rt_flags & RTF_CHAINDELETE)
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return; /* relax, it will all be done for us */
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|
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/* So what if it takes linear time? */
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do {
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lrt = rt;
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rt = rt->rt_nextchild;
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} while(rt && rt != rt0);
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lrt->rt_nextchild = rt0->rt_nextchild;
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} else if((rt = rt0)->rt_nextchild) {
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lrt = rt;
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rt->rt_flags |= RTF_CHAINDELETE;
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|
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rt = rt->rt_nextchild;
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|
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while(rt) {
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nrt = rt->rt_nextchild;
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/*
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|
* There might be some value to open-coding this
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|
* rtrequest call, but I am not yet convinced of
|
|
* the value of this.
|
|
*/
|
|
rtrequest(RTM_DELETE, rt_key(rt),
|
|
(struct sockaddr *)0, rt_mask(rt),
|
|
rt->rt_flags, (struct rtentry **)0);
|
|
rt = nrt;
|
|
}
|
|
lrt->rt_flags &= ~RTF_CHAINDELETE;
|
|
}
|
|
}
|
|
|
|
int
|
|
rt_setgate(rt0, dst, gate)
|
|
struct rtentry *rt0;
|
|
struct sockaddr *dst, *gate;
|
|
{
|
|
caddr_t new, old;
|
|
int dlen = ROUNDUP(dst->sa_len), glen = ROUNDUP(gate->sa_len);
|
|
register struct rtentry *rt = rt0;
|
|
|
|
if (rt->rt_gateway == 0 || glen > ROUNDUP(rt->rt_gateway->sa_len)) {
|
|
old = (caddr_t)rt_key(rt);
|
|
R_Malloc(new, caddr_t, dlen + glen);
|
|
if (new == 0)
|
|
return 1;
|
|
rt->rt_nodes->rn_key = new;
|
|
} else {
|
|
new = rt->rt_nodes->rn_key;
|
|
old = 0;
|
|
}
|
|
Bcopy(gate, (rt->rt_gateway = (struct sockaddr *)(new + dlen)), glen);
|
|
if (old) {
|
|
Bcopy(dst, new, dlen);
|
|
Free(old);
|
|
}
|
|
if (rt->rt_gwroute) {
|
|
rt = rt->rt_gwroute; RTFREE(rt);
|
|
rt = rt0; rt->rt_gwroute = 0;
|
|
}
|
|
if (rt->rt_flags & RTF_GATEWAY) {
|
|
rt->rt_gwroute = rtalloc1(gate, 1, 0UL);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
void
|
|
rt_maskedcopy(src, dst, netmask)
|
|
struct sockaddr *src, *dst, *netmask;
|
|
{
|
|
register u_char *cp1 = (u_char *)src;
|
|
register u_char *cp2 = (u_char *)dst;
|
|
register u_char *cp3 = (u_char *)netmask;
|
|
u_char *cplim = cp2 + *cp3;
|
|
u_char *cplim2 = cp2 + *cp1;
|
|
|
|
*cp2++ = *cp1++; *cp2++ = *cp1++; /* copies sa_len & sa_family */
|
|
cp3 += 2;
|
|
if (cplim > cplim2)
|
|
cplim = cplim2;
|
|
while (cp2 < cplim)
|
|
*cp2++ = *cp1++ & *cp3++;
|
|
if (cp2 < cplim2)
|
|
bzero((caddr_t)cp2, (unsigned)(cplim2 - cp2));
|
|
}
|
|
|
|
/*
|
|
* Set up a routing table entry, normally
|
|
* for an interface.
|
|
*/
|
|
int
|
|
rtinit(ifa, cmd, flags)
|
|
register struct ifaddr *ifa;
|
|
int cmd, flags;
|
|
{
|
|
register struct rtentry *rt;
|
|
register struct sockaddr *dst;
|
|
register struct sockaddr *deldst;
|
|
struct mbuf *m = 0;
|
|
struct rtentry *nrt = 0;
|
|
int error;
|
|
|
|
dst = flags & RTF_HOST ? ifa->ifa_dstaddr : ifa->ifa_addr;
|
|
if (cmd == RTM_DELETE) {
|
|
if ((flags & RTF_HOST) == 0 && ifa->ifa_netmask) {
|
|
m = m_get(M_WAIT, MT_SONAME);
|
|
deldst = mtod(m, struct sockaddr *);
|
|
rt_maskedcopy(dst, deldst, ifa->ifa_netmask);
|
|
dst = deldst;
|
|
}
|
|
rt = rtalloc1(dst, 0, 0UL);
|
|
if (rt) {
|
|
rt->rt_refcnt--;
|
|
if (rt->rt_ifa != ifa) {
|
|
if (m)
|
|
(void) m_free(m);
|
|
return (flags & RTF_HOST ? EHOSTUNREACH
|
|
: ENETUNREACH);
|
|
}
|
|
}
|
|
}
|
|
error = rtrequest(cmd, dst, ifa->ifa_addr, ifa->ifa_netmask,
|
|
flags | ifa->ifa_flags, &nrt);
|
|
if (m)
|
|
(void) m_free(m);
|
|
if (cmd == RTM_DELETE && error == 0 && (rt = nrt)) {
|
|
rt_newaddrmsg(cmd, ifa, error, nrt);
|
|
if (rt->rt_refcnt <= 0) {
|
|
rt->rt_refcnt++;
|
|
rtfree(rt);
|
|
}
|
|
}
|
|
if (cmd == RTM_ADD && error == 0 && (rt = nrt)) {
|
|
rt->rt_refcnt--;
|
|
if (rt->rt_ifa != ifa) {
|
|
printf("rtinit: wrong ifa (%p) was (%p)\n", ifa,
|
|
rt->rt_ifa);
|
|
if (rt->rt_ifa->ifa_rtrequest)
|
|
rt->rt_ifa->ifa_rtrequest(RTM_DELETE, rt, SA(0));
|
|
IFAFREE(rt->rt_ifa);
|
|
rt->rt_ifa = ifa;
|
|
rt->rt_ifp = ifa->ifa_ifp;
|
|
ifa->ifa_refcnt++;
|
|
if (ifa->ifa_rtrequest)
|
|
ifa->ifa_rtrequest(RTM_ADD, rt, SA(0));
|
|
}
|
|
rt_newaddrmsg(cmd, ifa, error, nrt);
|
|
}
|
|
return (e |