540 lines
13 KiB
C
540 lines
13 KiB
C
/* $NetBSD: route.c,v 1.16 1996/10/13 02:11:10 christos Exp $ */
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/*
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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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*/
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#include <sys/param.h>
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#include <sys/systm.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);
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}
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struct rtentry *
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rtalloc1(dst, report)
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register struct sockaddr *dst;
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int report;
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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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int s = splsoftnet(), 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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if (report && (rt->rt_flags & RTF_CLONING)) {
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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 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 (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 splsoftnet
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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);
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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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u_long req;
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caddr_t data;
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struct proc *p;
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{
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return (EOPNOTSUPP);
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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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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);
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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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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 = splsoftnet(); 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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#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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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;
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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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goto makeroute;
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case RTM_ADD:
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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 (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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int
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rt_setgate(rt0, dst, gate)
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struct rtentry *rt0;
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struct sockaddr *dst, *gate;
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{
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caddr_t new, old;
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int dlen = ROUNDUP(dst->sa_len), glen = ROUNDUP(gate->sa_len);
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register struct rtentry *rt = rt0;
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if (rt->rt_gateway == 0 || glen > ROUNDUP(rt->rt_gateway->sa_len)) {
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old = (caddr_t)rt_key(rt);
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R_Malloc(new, caddr_t, dlen + glen);
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if (new == 0)
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return 1;
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rt->rt_nodes->rn_key = new;
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} else {
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new = rt->rt_nodes->rn_key;
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old = 0;
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}
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Bcopy(gate, (rt->rt_gateway = (struct sockaddr *)(new + dlen)), glen);
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if (old) {
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Bcopy(dst, new, dlen);
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Free(old);
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}
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if (rt->rt_gwroute) {
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rt = rt->rt_gwroute; RTFREE(rt);
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rt = rt0; rt->rt_gwroute = 0;
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}
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if (rt->rt_flags & RTF_GATEWAY) {
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rt->rt_gwroute = rtalloc1(gate, 1);
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}
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return 0;
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}
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void
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rt_maskedcopy(src, dst, netmask)
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struct sockaddr *src, *dst, *netmask;
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{
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register u_char *cp1 = (u_char *)src;
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register u_char *cp2 = (u_char *)dst;
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register u_char *cp3 = (u_char *)netmask;
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u_char *cplim = cp2 + *cp3;
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u_char *cplim2 = cp2 + *cp1;
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*cp2++ = *cp1++; *cp2++ = *cp1++; /* copies sa_len & sa_family */
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cp3 += 2;
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if (cplim > cplim2)
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cplim = cplim2;
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while (cp2 < cplim)
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*cp2++ = *cp1++ & *cp3++;
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if (cp2 < cplim2)
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bzero((caddr_t)cp2, (unsigned)(cplim2 - cp2));
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}
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/*
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* Set up a routing table entry, normally
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* for an interface.
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*/
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int
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rtinit(ifa, cmd, flags)
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register struct ifaddr *ifa;
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int cmd, flags;
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{
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register struct rtentry *rt;
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register struct sockaddr *dst;
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register struct sockaddr *deldst;
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struct mbuf *m = 0;
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struct rtentry *nrt = 0;
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int error;
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dst = flags & RTF_HOST ? ifa->ifa_dstaddr : ifa->ifa_addr;
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if (cmd == RTM_DELETE) {
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if ((flags & RTF_HOST) == 0 && ifa->ifa_netmask) {
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m = m_get(M_WAIT, MT_SONAME);
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deldst = mtod(m, struct sockaddr *);
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rt_maskedcopy(dst, deldst, ifa->ifa_netmask);
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dst = deldst;
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}
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if ((rt = rtalloc1(dst, 0)) != NULL) {
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rt->rt_refcnt--;
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if (rt->rt_ifa != ifa) {
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if (m)
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(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 (error);
|
|
}
|