2 * Copyright (c) 1980, 1986, 1991, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * @(#)route.c 8.3.1.1 (Berkeley) 2/23/95
32 /************************************************************************
33 * Note: In this file a 'fib' is a "forwarding information base" *
34 * Which is the new name for an in kernel routing (next hop) table. *
35 ***********************************************************************/
38 #include "opt_route.h"
39 #include "opt_mrouting.h"
40 #include "opt_mpath.h"
42 #include <sys/param.h>
43 #include <sys/systm.h>
44 #include <sys/syslog.h>
45 #include <sys/malloc.h>
47 #include <sys/socket.h>
48 #include <sys/sysctl.h>
49 #include <sys/syslog.h>
50 #include <sys/sysproto.h>
52 #include <sys/domain.h>
53 #include <sys/kernel.h>
56 #include <net/if_dl.h>
57 #include <net/route.h>
59 #include <net/flowtable.h>
62 #include <net/radix_mpath.h>
65 #include <netinet/in.h>
66 #include <netinet/ip_mroute.h>
70 u_int rt_numfibs = RT_NUMFIBS;
71 SYSCTL_INT(_net, OID_AUTO, fibs, CTLFLAG_RD, &rt_numfibs, 0, "");
73 * Allow the boot code to allow LESS than RT_MAXFIBS to be used.
74 * We can't do more because storage is statically allocated for now.
75 * (for compatibility reasons.. this will change).
77 TUNABLE_INT("net.fibs", &rt_numfibs);
80 * By default add routes to all fibs for new interfaces.
81 * Once this is set to 0 then only allocate routes on interface
82 * changes for the FIB of the caller when adding a new set of addresses
83 * to an interface. XXX this is a shotgun aproach to a problem that needs
84 * a more fine grained solution.. that will come.
86 u_int rt_add_addr_allfibs = 1;
87 SYSCTL_INT(_net, OID_AUTO, add_addr_allfibs, CTLFLAG_RW,
88 &rt_add_addr_allfibs, 0, "");
89 TUNABLE_INT("net.add_addr_allfibs", &rt_add_addr_allfibs);
91 VNET_DEFINE(struct radix_node_head *, rt_tables);
92 static VNET_DEFINE(uma_zone_t, rtzone); /* Routing table UMA zone. */
93 VNET_DEFINE(int, rttrash); /* routes not in table but not freed */
94 VNET_DEFINE(struct rtstat, rtstat);
96 #define V_rt_tables VNET(rt_tables)
97 #define V_rtzone VNET(rtzone)
98 #define V_rttrash VNET(rttrash)
99 #define V_rtstat VNET(rtstat)
102 /* compare two sockaddr structures */
103 #define sa_equal(a1, a2) (bcmp((a1), (a2), (a1)->sa_len) == 0)
106 * Convert a 'struct radix_node *' to a 'struct rtentry *'.
107 * The operation can be done safely (in this code) because a
108 * 'struct rtentry' starts with two 'struct radix_node''s, the first
109 * one representing leaf nodes in the routing tree, which is
110 * what the code in radix.c passes us as a 'struct radix_node'.
112 * But because there are a lot of assumptions in this conversion,
113 * do not cast explicitly, but always use the macro below.
115 #define RNTORT(p) ((struct rtentry *)(p))
118 /* default fib for tunnels to use */
119 u_int tunnel_fib = 0;
120 SYSCTL_INT(_net, OID_AUTO, tunnelfib, CTLFLAG_RD, &tunnel_fib, 0, "");
124 * handler for net.my_fibnum
127 sysctl_my_fibnum(SYSCTL_HANDLER_ARGS)
132 fibnum = curthread->td_proc->p_fibnum;
133 error = sysctl_handle_int(oidp, &fibnum, 0, req);
137 SYSCTL_PROC(_net, OID_AUTO, my_fibnum, CTLTYPE_INT|CTLFLAG_RD,
138 NULL, 0, &sysctl_my_fibnum, "I", "default FIB of caller");
140 static __inline struct radix_node_head **
141 rt_tables_get_rnh_ptr(int table, int fam)
143 struct radix_node_head **rnh;
145 KASSERT(table >= 0 && table < rt_numfibs, ("%s: table out of bounds.",
147 KASSERT(fam >= 0 && fam < (AF_MAX+1), ("%s: fam out of bounds.",
150 /* rnh is [fib=0][af=0]. */
151 rnh = (struct radix_node_head **)V_rt_tables;
152 /* Get the offset to the requested table and fam. */
153 rnh += table * (AF_MAX+1) + fam;
158 struct radix_node_head *
159 rt_tables_get_rnh(int table, int fam)
162 return (*rt_tables_get_rnh_ptr(table, fam));
166 * route initialization must occur before ip6_init2(), which happenas at
175 /* whack the tunable ints into line. */
176 if (rt_numfibs > RT_MAXFIBS)
177 rt_numfibs = RT_MAXFIBS;
181 for (dom = domains; dom; dom = dom->dom_next)
182 if (dom->dom_maxrtkey > max_keylen)
183 max_keylen = dom->dom_maxrtkey;
185 rn_init(max_keylen); /* init all zeroes, all ones, mask table */
187 SYSINIT(route_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, route_init, 0);
190 vnet_route_init(const void *unused __unused)
193 struct radix_node_head **rnh;
197 V_rt_tables = malloc(rt_numfibs * (AF_MAX+1) *
198 sizeof(struct radix_node_head *), M_RTABLE, M_WAITOK|M_ZERO);
200 V_rtzone = uma_zcreate("rtentry", sizeof(struct rtentry), NULL, NULL,
201 NULL, NULL, UMA_ALIGN_PTR, 0);
202 for (dom = domains; dom; dom = dom->dom_next) {
203 if (dom->dom_rtattach) {
204 for (table = 0; table < rt_numfibs; table++) {
205 if ( (fam = dom->dom_family) == AF_INET ||
207 /* for now only AF_INET has > 1 table */
209 * rtattach will be also called
210 * from vfs_export.c but the
212 * (only for AF_INET and AF_INET6
213 * which don't need it anyhow)
215 rnh = rt_tables_get_rnh_ptr(table, fam);
217 panic("%s: rnh NULL", __func__);
218 dom->dom_rtattach((void **)rnh,
227 VNET_SYSINIT(vnet_route_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_FOURTH,
232 vnet_route_uninit(const void *unused __unused)
237 struct radix_node_head **rnh;
239 for (dom = domains; dom; dom = dom->dom_next) {
240 if (dom->dom_rtdetach) {
241 for (table = 0; table < rt_numfibs; table++) {
242 if ( (fam = dom->dom_family) == AF_INET ||
244 /* For now only AF_INET has > 1 tbl. */
245 rnh = rt_tables_get_rnh_ptr(table, fam);
247 panic("%s: rnh NULL", __func__);
248 dom->dom_rtdetach((void **)rnh,
257 VNET_SYSUNINIT(vnet_route_uninit, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD,
258 vnet_route_uninit, 0);
261 #ifndef _SYS_SYSPROTO_H_
267 setfib(struct thread *td, struct setfib_args *uap)
269 if (uap->fibnum < 0 || uap->fibnum >= rt_numfibs)
271 td->td_proc->p_fibnum = uap->fibnum;
276 * Packet routing routines.
279 rtalloc(struct route *ro)
281 rtalloc_ign_fib(ro, 0UL, 0);
285 rtalloc_fib(struct route *ro, u_int fibnum)
287 rtalloc_ign_fib(ro, 0UL, fibnum);
291 rtalloc_ign(struct route *ro, u_long ignore)
295 if ((rt = ro->ro_rt) != NULL) {
296 if (rt->rt_ifp != NULL && rt->rt_flags & RTF_UP)
301 ro->ro_rt = rtalloc1_fib(&ro->ro_dst, 1, ignore, 0);
303 RT_UNLOCK(ro->ro_rt);
307 rtalloc_ign_fib(struct route *ro, u_long ignore, u_int fibnum)
311 if ((rt = ro->ro_rt) != NULL) {
312 if (rt->rt_ifp != NULL && rt->rt_flags & RTF_UP)
317 ro->ro_rt = rtalloc1_fib(&ro->ro_dst, 1, ignore, fibnum);
319 RT_UNLOCK(ro->ro_rt);
323 * Look up the route that matches the address given
324 * Or, at least try.. Create a cloned route if needed.
326 * The returned route, if any, is locked.
329 rtalloc1(struct sockaddr *dst, int report, u_long ignflags)
331 return (rtalloc1_fib(dst, report, ignflags, 0));
335 rtalloc1_fib(struct sockaddr *dst, int report, u_long ignflags,
338 struct radix_node_head *rnh;
340 struct radix_node *rn;
341 struct rtentry *newrt;
342 struct rt_addrinfo info;
343 int err = 0, msgtype = RTM_MISS;
346 KASSERT((fibnum < rt_numfibs), ("rtalloc1_fib: bad fibnum"));
347 if (dst->sa_family != AF_INET) /* Only INET supports > 1 fib now */
349 rnh = rt_tables_get_rnh(fibnum, dst->sa_family);
352 * Look up the address in the table for that Address Family
355 V_rtstat.rts_unreach++;
358 needlock = !(ignflags & RTF_RNH_LOCKED);
360 RADIX_NODE_HEAD_RLOCK(rnh);
363 RADIX_NODE_HEAD_LOCK_ASSERT(rnh);
365 rn = rnh->rnh_matchaddr(dst, rnh);
366 if (rn && ((rn->rn_flags & RNF_ROOT) == 0)) {
367 newrt = rt = RNTORT(rn);
371 RADIX_NODE_HEAD_RUNLOCK(rnh);
375 RADIX_NODE_HEAD_RUNLOCK(rnh);
378 * Either we hit the root or couldn't find any match,
379 * Which basically means
380 * "caint get there frm here"
382 V_rtstat.rts_unreach++;
386 * If required, report the failure to the supervising
388 * For a delete, this is not an error. (report == 0)
390 bzero(&info, sizeof(info));
391 info.rti_info[RTAX_DST] = dst;
392 rt_missmsg(msgtype, &info, 0, err);
396 RT_LOCK_ASSERT(newrt);
401 * Remove a reference count from an rtentry.
402 * If the count gets low enough, take it out of the routing table
405 rtfree(struct rtentry *rt)
407 struct radix_node_head *rnh;
409 KASSERT(rt != NULL,("%s: NULL rt", __func__));
410 rnh = rt_tables_get_rnh(rt->rt_fibnum, rt_key(rt)->sa_family);
411 KASSERT(rnh != NULL,("%s: NULL rnh", __func__));
416 * The callers should use RTFREE_LOCKED() or RTFREE(), so
417 * we should come here exactly with the last reference.
420 if (rt->rt_refcnt > 0) {
421 log(LOG_DEBUG, "%s: %p has %d refs\n", __func__, rt, rt->rt_refcnt);
426 * On last reference give the "close method" a chance
427 * to cleanup private state. This also permits (for
428 * IPv4 and IPv6) a chance to decide if the routing table
429 * entry should be purged immediately or at a later time.
430 * When an immediate purge is to happen the close routine
431 * typically calls rtexpunge which clears the RTF_UP flag
432 * on the entry so that the code below reclaims the storage.
434 if (rt->rt_refcnt == 0 && rnh->rnh_close)
435 rnh->rnh_close((struct radix_node *)rt, rnh);
438 * If we are no longer "up" (and ref == 0)
439 * then we can free the resources associated
442 if ((rt->rt_flags & RTF_UP) == 0) {
443 if (rt->rt_nodes->rn_flags & (RNF_ACTIVE | RNF_ROOT))
446 * the rtentry must have been removed from the routing table
447 * so it is represented in rttrash.. remove that now.
451 if (rt->rt_refcnt < 0) {
452 printf("rtfree: %p not freed (neg refs)\n", rt);
457 * release references on items we hold them on..
458 * e.g other routes and ifaddrs.
461 ifa_free(rt->rt_ifa);
463 * The key is separatly alloc'd so free it (see rt_setgate()).
464 * This also frees the gateway, as they are always malloc'd
470 * and the rtentry itself of course
473 uma_zfree(V_rtzone, rt);
482 * Force a routing table entry to the specified
483 * destination to go through the given gateway.
484 * Normally called as a result of a routing redirect
485 * message from the network layer.
488 rtredirect(struct sockaddr *dst,
489 struct sockaddr *gateway,
490 struct sockaddr *netmask,
492 struct sockaddr *src)
494 rtredirect_fib(dst, gateway, netmask, flags, src, 0);
498 rtredirect_fib(struct sockaddr *dst,
499 struct sockaddr *gateway,
500 struct sockaddr *netmask,
502 struct sockaddr *src,
505 struct rtentry *rt, *rt0 = NULL;
508 struct rt_addrinfo info;
510 struct radix_node_head *rnh;
513 rnh = rt_tables_get_rnh(fibnum, dst->sa_family);
515 error = EAFNOSUPPORT;
519 /* verify the gateway is directly reachable */
520 if ((ifa = ifa_ifwithnet(gateway)) == NULL) {
524 rt = rtalloc1_fib(dst, 0, 0UL, fibnum); /* NB: rt is locked */
526 * If the redirect isn't from our current router for this dst,
527 * it's either old or wrong. If it redirects us to ourselves,
528 * we have a routing loop, perhaps as a result of an interface
529 * going down recently.
531 if (!(flags & RTF_DONE) && rt &&
532 (!sa_equal(src, rt->rt_gateway) || rt->rt_ifa != ifa))
534 else if (ifa_ifwithaddr_check(gateway))
535 error = EHOSTUNREACH;
539 * Create a new entry if we just got back a wildcard entry
540 * or the the lookup failed. This is necessary for hosts
541 * which use routing redirects generated by smart gateways
542 * to dynamically build the routing tables.
544 if (rt == NULL || (rt_mask(rt) && rt_mask(rt)->sa_len < 2))
547 * Don't listen to the redirect if it's
548 * for a route to an interface.
550 if (rt->rt_flags & RTF_GATEWAY) {
551 if (((rt->rt_flags & RTF_HOST) == 0) && (flags & RTF_HOST)) {
553 * Changing from route to net => route to host.
554 * Create new route, rather than smashing route to net.
560 flags |= RTF_GATEWAY | RTF_DYNAMIC;
561 bzero((caddr_t)&info, sizeof(info));
562 info.rti_info[RTAX_DST] = dst;
563 info.rti_info[RTAX_GATEWAY] = gateway;
564 info.rti_info[RTAX_NETMASK] = netmask;
566 info.rti_flags = flags;
568 RT_UNLOCK(rt0); /* drop lock to avoid LOR with RNH */
569 error = rtrequest1_fib(RTM_ADD, &info, &rt, fibnum);
573 EVENTHANDLER_INVOKE(route_redirect_event, rt0, rt, dst);
574 flags = rt->rt_flags;
579 stat = &V_rtstat.rts_dynamic;
581 struct rtentry *gwrt;
584 * Smash the current notion of the gateway to
585 * this destination. Should check about netmask!!!
587 rt->rt_flags |= RTF_MODIFIED;
588 flags |= RTF_MODIFIED;
589 stat = &V_rtstat.rts_newgateway;
591 * add the key and gateway (in one malloc'd chunk).
594 RADIX_NODE_HEAD_LOCK(rnh);
596 rt_setgate(rt, rt_key(rt), gateway);
597 gwrt = rtalloc1(gateway, 1, RTF_RNH_LOCKED);
598 RADIX_NODE_HEAD_UNLOCK(rnh);
599 EVENTHANDLER_INVOKE(route_redirect_event, rt, gwrt, dst);
603 error = EHOSTUNREACH;
609 V_rtstat.rts_badredirect++;
610 else if (stat != NULL)
612 bzero((caddr_t)&info, sizeof(info));
613 info.rti_info[RTAX_DST] = dst;
614 info.rti_info[RTAX_GATEWAY] = gateway;
615 info.rti_info[RTAX_NETMASK] = netmask;
616 info.rti_info[RTAX_AUTHOR] = src;
617 rt_missmsg(RTM_REDIRECT, &info, flags, error);
623 rtioctl(u_long req, caddr_t data)
625 return (rtioctl_fib(req, data, 0));
629 * Routing table ioctl interface.
632 rtioctl_fib(u_long req, caddr_t data, u_int fibnum)
636 * If more ioctl commands are added here, make sure the proper
637 * super-user checks are being performed because it is possible for
638 * prison-root to make it this far if raw sockets have been enabled
642 /* Multicast goop, grrr... */
643 return mrt_ioctl ? mrt_ioctl(req, data, fibnum) : EOPNOTSUPP;
650 * For both ifa_ifwithroute() routines, 'ifa' is returned referenced.
653 ifa_ifwithroute(int flags, struct sockaddr *dst, struct sockaddr *gateway)
655 return (ifa_ifwithroute_fib(flags, dst, gateway, 0));
659 ifa_ifwithroute_fib(int flags, struct sockaddr *dst, struct sockaddr *gateway,
662 register struct ifaddr *ifa;
665 if ((flags & RTF_GATEWAY) == 0) {
667 * If we are adding a route to an interface,
668 * and the interface is a pt to pt link
669 * we should search for the destination
670 * as our clue to the interface. Otherwise
671 * we can use the local address.
674 if (flags & RTF_HOST)
675 ifa = ifa_ifwithdstaddr(dst);
677 ifa = ifa_ifwithaddr(gateway);
680 * If we are adding a route to a remote net
681 * or host, the gateway may still be on the
682 * other end of a pt to pt link.
684 ifa = ifa_ifwithdstaddr(gateway);
687 ifa = ifa_ifwithnet(gateway);
689 struct rtentry *rt = rtalloc1_fib(gateway, 0, RTF_RNH_LOCKED, fibnum);
693 * dismiss a gateway that is reachable only
694 * through the default router
696 switch (gateway->sa_family) {
698 if (satosin(rt_key(rt))->sin_addr.s_addr == INADDR_ANY)
702 if (IN6_IS_ADDR_UNSPECIFIED(&satosin6(rt_key(rt))->sin6_addr))
708 if (!not_found && rt->rt_ifa != NULL) {
714 if (not_found || ifa == NULL)
717 if (ifa->ifa_addr->sa_family != dst->sa_family) {
718 struct ifaddr *oifa = ifa;
719 ifa = ifaof_ifpforaddr(dst, ifa->ifa_ifp);
729 * Do appropriate manipulations of a routing tree given
730 * all the bits of info needed
734 struct sockaddr *dst,
735 struct sockaddr *gateway,
736 struct sockaddr *netmask,
738 struct rtentry **ret_nrt)
740 return (rtrequest_fib(req, dst, gateway, netmask, flags, ret_nrt, 0));
744 rtrequest_fib(int req,
745 struct sockaddr *dst,
746 struct sockaddr *gateway,
747 struct sockaddr *netmask,
749 struct rtentry **ret_nrt,
752 struct rt_addrinfo info;
754 if (dst->sa_len == 0)
757 bzero((caddr_t)&info, sizeof(info));
758 info.rti_flags = flags;
759 info.rti_info[RTAX_DST] = dst;
760 info.rti_info[RTAX_GATEWAY] = gateway;
761 info.rti_info[RTAX_NETMASK] = netmask;
762 return rtrequest1_fib(req, &info, ret_nrt, fibnum);
766 * These (questionable) definitions of apparent local variables apply
767 * to the next two functions. XXXXXX!!!
769 #define dst info->rti_info[RTAX_DST]
770 #define gateway info->rti_info[RTAX_GATEWAY]
771 #define netmask info->rti_info[RTAX_NETMASK]
772 #define ifaaddr info->rti_info[RTAX_IFA]
773 #define ifpaddr info->rti_info[RTAX_IFP]
774 #define flags info->rti_flags
777 rt_getifa(struct rt_addrinfo *info)
779 return (rt_getifa_fib(info, 0));
783 * Look up rt_addrinfo for a specific fib. Note that if rti_ifa is defined,
784 * it will be referenced so the caller must free it.
787 rt_getifa_fib(struct rt_addrinfo *info, u_int fibnum)
793 * ifp may be specified by sockaddr_dl
794 * when protocol address is ambiguous.
796 if (info->rti_ifp == NULL && ifpaddr != NULL &&
797 ifpaddr->sa_family == AF_LINK &&
798 (ifa = ifa_ifwithnet(ifpaddr)) != NULL) {
799 info->rti_ifp = ifa->ifa_ifp;
802 if (info->rti_ifa == NULL && ifaaddr != NULL)
803 info->rti_ifa = ifa_ifwithaddr(ifaaddr);
804 if (info->rti_ifa == NULL) {
807 sa = ifaaddr != NULL ? ifaaddr :
808 (gateway != NULL ? gateway : dst);
809 if (sa != NULL && info->rti_ifp != NULL)
810 info->rti_ifa = ifaof_ifpforaddr(sa, info->rti_ifp);
811 else if (dst != NULL && gateway != NULL)
812 info->rti_ifa = ifa_ifwithroute_fib(flags, dst, gateway,
815 info->rti_ifa = ifa_ifwithroute_fib(flags, sa, sa,
818 if ((ifa = info->rti_ifa) != NULL) {
819 if (info->rti_ifp == NULL)
820 info->rti_ifp = ifa->ifa_ifp;
827 * Expunges references to a route that's about to be reclaimed.
828 * The route must be locked.
831 rtexpunge(struct rtentry *rt)
833 struct radix_node *rn;
834 struct radix_node_head *rnh;
839 * Find the correct routing tree to use for this Address Family
841 rnh = rt_tables_get_rnh(rt->rt_fibnum, rt_key(rt)->sa_family);
844 return (EAFNOSUPPORT);
845 RADIX_NODE_HEAD_LOCK_ASSERT(rnh);
848 * We cannot assume anything about the reference count
849 * because protocols call us in many situations; often
850 * before unwinding references to the table entry.
852 KASSERT(rt->rt_refcnt <= 1, ("bogus refcnt %ld", rt->rt_refcnt));
855 * Remove the item from the tree; it should be there,
856 * but when callers invoke us blindly it may not (sigh).
858 rn = rnh->rnh_deladdr(rt_key(rt), rt_mask(rt), rnh);
863 KASSERT((rn->rn_flags & (RNF_ACTIVE | RNF_ROOT)) == 0,
864 ("unexpected flags 0x%x", rn->rn_flags));
865 KASSERT(rt == RNTORT(rn),
866 ("lookup mismatch, rt %p rn %p", rt, rn));
868 rt->rt_flags &= ~RTF_UP;
871 * Give the protocol a chance to keep things in sync.
873 if ((ifa = rt->rt_ifa) && ifa->ifa_rtrequest) {
874 struct rt_addrinfo info;
876 bzero((caddr_t)&info, sizeof(info));
877 info.rti_flags = rt->rt_flags;
878 info.rti_info[RTAX_DST] = rt_key(rt);
879 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
880 info.rti_info[RTAX_NETMASK] = rt_mask(rt);
881 ifa->ifa_rtrequest(RTM_DELETE, rt, &info);
885 * one more rtentry floating around that is not
886 * linked to the routing table.
895 rn_mpath_update(int req, struct rt_addrinfo *info,
896 struct radix_node_head *rnh, struct rtentry **ret_nrt)
899 * if we got multipath routes, we require users to specify
900 * a matching RTAX_GATEWAY.
902 struct rtentry *rt, *rto = NULL;
903 register struct radix_node *rn;
906 rn = rnh->rnh_matchaddr(dst, rnh);
909 rto = rt = RNTORT(rn);
910 rt = rt_mpath_matchgate(rt, gateway);
914 * this is the first entry in the chain
917 rn = rn_mpath_next((struct radix_node *)rt);
919 * there is another entry, now it's active
924 rto->rt_flags |= RTF_UP;
926 } else if (rt->rt_flags & RTF_GATEWAY) {
928 * For gateway routes, we need to
929 * make sure that we we are deleting
930 * the correct gateway.
931 * rt_mpath_matchgate() does not
932 * check the case when there is only
933 * one route in the chain.
936 (rt->rt_gateway->sa_len != gateway->sa_len ||
937 memcmp(rt->rt_gateway, gateway, gateway->sa_len)))
941 * remove from tree before returning it
944 rn = rnh->rnh_deladdr(dst, netmask, rnh);
945 KASSERT(rt == RNTORT(rn), ("radix node disappeared"));
951 * use the normal delete code to remove
954 if (req != RTM_DELETE)
962 * if the entry is 2nd and on up
964 if ((req == RTM_DELETE) && !rt_mpath_deldup(rto, rt))
965 panic ("rtrequest1: rt_mpath_deldup");
969 if (req == RTM_DELETE) {
970 rt->rt_flags &= ~RTF_UP;
972 * One more rtentry floating around that is not
973 * linked to the routing table. rttrash will be decremented
974 * when RTFREE(rt) is eventually called.
980 if (req != RTM_DELETE)
981 panic("unrecognized request %d", req);
985 * If the caller wants it, then it can have it,
986 * but it's up to it to free the rtentry as we won't be
1000 rtrequest1_fib(int req, struct rt_addrinfo *info, struct rtentry **ret_nrt,
1003 int error = 0, needlock = 0;
1004 register struct rtentry *rt;
1006 register struct rtentry *rt0;
1008 register struct radix_node *rn;
1009 register struct radix_node_head *rnh;
1011 struct sockaddr *ndst;
1012 #define senderr(x) { error = x ; goto bad; }
1014 KASSERT((fibnum < rt_numfibs), ("rtrequest1_fib: bad fibnum"));
1015 if (dst->sa_family != AF_INET) /* Only INET supports > 1 fib now */
1018 * Find the correct routing tree to use for this Address Family
1020 rnh = rt_tables_get_rnh(fibnum, dst->sa_family);
1022 return (EAFNOSUPPORT);
1023 needlock = ((flags & RTF_RNH_LOCKED) == 0);
1024 flags &= ~RTF_RNH_LOCKED;
1026 RADIX_NODE_HEAD_LOCK(rnh);
1028 RADIX_NODE_HEAD_LOCK_ASSERT(rnh);
1030 * If we are adding a host route then we don't want to put
1031 * a netmask in the tree, nor do we want to clone it.
1033 if (flags & RTF_HOST)
1039 if (rn_mpath_capable(rnh)) {
1040 error = rn_mpath_update(req, info, rnh, ret_nrt);
1042 * "bad" holds true for the success case
1045 if (error != ENOENT)
1050 * Remove the item from the tree and return it.
1051 * Complain if it is not there and do no more processing.
1053 rn = rnh->rnh_deladdr(dst, netmask, rnh);
1056 if (rn->rn_flags & (RNF_ACTIVE | RNF_ROOT))
1057 panic ("rtrequest delete");
1061 rt->rt_flags &= ~RTF_UP;
1064 * give the protocol a chance to keep things in sync.
1066 if ((ifa = rt->rt_ifa) && ifa->ifa_rtrequest)
1067 ifa->ifa_rtrequest(RTM_DELETE, rt, info);
1070 * One more rtentry floating around that is not
1071 * linked to the routing table. rttrash will be decremented
1072 * when RTFREE(rt) is eventually called.
1077 * If the caller wants it, then it can have it,
1078 * but it's up to it to free the rtentry as we won't be
1089 * resolve was only used for route cloning
1094 if ((flags & RTF_GATEWAY) && !gateway)
1096 if (dst && gateway && (dst->sa_family != gateway->sa_family) &&
1097 (gateway->sa_family != AF_UNSPEC) && (gateway->sa_family != AF_LINK))
1100 if (info->rti_ifa == NULL) {
1101 error = rt_getifa_fib(info, fibnum);
1105 ifa_ref(info->rti_ifa);
1106 ifa = info->rti_ifa;
1107 rt = uma_zalloc(V_rtzone, M_NOWAIT | M_ZERO);
1114 rt->rt_flags = RTF_UP | flags;
1115 rt->rt_fibnum = fibnum;
1117 * Add the gateway. Possibly re-malloc-ing the storage for it
1121 if ((error = rt_setgate(rt, dst, gateway)) != 0) {
1122 RT_LOCK_DESTROY(rt);
1125 uma_zfree(V_rtzone, rt);
1130 * point to the (possibly newly malloc'd) dest address.
1132 ndst = (struct sockaddr *)rt_key(rt);
1135 * make sure it contains the value we want (masked if needed).
1138 rt_maskedcopy(dst, ndst, netmask);
1140 bcopy(dst, ndst, dst->sa_len);
1143 * We use the ifa reference returned by rt_getifa_fib().
1144 * This moved from below so that rnh->rnh_addaddr() can
1145 * examine the ifa and ifa->ifa_ifp if it so desires.
1148 rt->rt_ifp = ifa->ifa_ifp;
1149 rt->rt_rmx.rmx_weight = 1;
1152 /* do not permit exactly the same dst/mask/gw pair */
1153 if (rn_mpath_capable(rnh) &&
1154 rt_mpath_conflict(rnh, rt, netmask)) {
1156 ifa_free(rt->rt_ifa);
1159 RT_LOCK_DESTROY(rt);
1160 uma_zfree(V_rtzone, rt);
1168 * "flow-table" only support IPv4 at the moment.
1171 if (dst->sa_family == AF_INET) {
1172 rn = rnh->rnh_matchaddr(dst, rnh);
1173 if (rn && ((rn->rn_flags & RNF_ROOT) == 0)) {
1174 struct sockaddr *mask;
1179 * compare mask to see if the new route is
1180 * more specific than the existing one
1187 * A host route is already present, so
1188 * leave the flow-table entries as is.
1190 if (rt0->rt_flags & RTF_HOST) {
1193 } else if (!(flags & RTF_HOST) && netmask) {
1194 mask = rt_mask(rt0);
1197 n = (u_char *)netmask;
1204 if (len == 0 || (*n < *m)) {
1214 /* XXX mtu manipulation will be done in rnh_addaddr -- itojun */
1215 rn = rnh->rnh_addaddr(ndst, netmask, rnh, rt->rt_nodes);
1217 * If it still failed to go into the tree,
1218 * then un-make it (this should be a function)
1222 ifa_free(rt->rt_ifa);
1224 RT_LOCK_DESTROY(rt);
1225 uma_zfree(V_rtzone, rt);
1233 else if (rt0 != NULL) {
1235 flowtable_route_flush(V_ip_ft, rt0);
1242 * If this protocol has something to add to this then
1243 * allow it to do that as well.
1245 if (ifa->ifa_rtrequest)
1246 ifa->ifa_rtrequest(req, rt, info);
1249 * actually return a resultant rtentry and
1250 * give the caller a single reference.
1263 RADIX_NODE_HEAD_UNLOCK(rnh);
1276 rt_setgate(struct rtentry *rt, struct sockaddr *dst, struct sockaddr *gate)
1278 /* XXX dst may be overwritten, can we move this to below */
1279 int dlen = SA_SIZE(dst), glen = SA_SIZE(gate);
1281 struct radix_node_head *rnh;
1283 rnh = rt_tables_get_rnh(rt->rt_fibnum, dst->sa_family);
1287 RADIX_NODE_HEAD_LOCK_ASSERT(rnh);
1290 * Prepare to store the gateway in rt->rt_gateway.
1291 * Both dst and gateway are stored one after the other in the same
1292 * malloc'd chunk. If we have room, we can reuse the old buffer,
1293 * rt_gateway already points to the right place.
1294 * Otherwise, malloc a new block and update the 'dst' address.
1296 if (rt->rt_gateway == NULL || glen > SA_SIZE(rt->rt_gateway)) {
1299 R_Malloc(new, caddr_t, dlen + glen);
1303 * XXX note, we copy from *dst and not *rt_key(rt) because
1304 * rt_setgate() can be called to initialize a newly
1305 * allocated route entry, in which case rt_key(rt) == NULL
1306 * (and also rt->rt_gateway == NULL).
1307 * Free()/free() handle a NULL argument just fine.
1309 bcopy(dst, new, dlen);
1310 Free(rt_key(rt)); /* free old block, if any */
1311 rt_key(rt) = (struct sockaddr *)new;
1312 rt->rt_gateway = (struct sockaddr *)(new + dlen);
1316 * Copy the new gateway value into the memory chunk.
1318 bcopy(gate, rt->rt_gateway, glen);
1324 rt_maskedcopy(struct sockaddr *src, struct sockaddr *dst, struct sockaddr *netmask)
1326 register u_char *cp1 = (u_char *)src;
1327 register u_char *cp2 = (u_char *)dst;
1328 register u_char *cp3 = (u_char *)netmask;
1329 u_char *cplim = cp2 + *cp3;
1330 u_char *cplim2 = cp2 + *cp1;
1332 *cp2++ = *cp1++; *cp2++ = *cp1++; /* copies sa_len & sa_family */
1337 *cp2++ = *cp1++ & *cp3++;
1339 bzero((caddr_t)cp2, (unsigned)(cplim2 - cp2));
1343 * Set up a routing table entry, normally
1346 #define _SOCKADDR_TMPSIZE 128 /* Not too big.. kernel stack size is limited */
1348 rtinit1(struct ifaddr *ifa, int cmd, int flags, int fibnum)
1350 struct sockaddr *dst;
1351 struct sockaddr *netmask;
1352 struct rtentry *rt = NULL;
1353 struct rt_addrinfo info;
1355 int startfib, endfib;
1356 char tempbuf[_SOCKADDR_TMPSIZE];
1359 static struct sockaddr_dl null_sdl = {sizeof(null_sdl), AF_LINK};
1361 if (flags & RTF_HOST) {
1362 dst = ifa->ifa_dstaddr;
1365 dst = ifa->ifa_addr;
1366 netmask = ifa->ifa_netmask;
1368 if ( dst->sa_family != AF_INET)
1371 if (rt_add_addr_allfibs == 0 && cmd == (int)RTM_ADD) {
1372 startfib = endfib = curthread->td_proc->p_fibnum;
1375 endfib = rt_numfibs - 1;
1378 KASSERT((fibnum < rt_numfibs), ("rtinit1: bad fibnum"));
1382 if (dst->sa_len == 0)
1386 * If it's a delete, check that if it exists,
1387 * it's on the correct interface or we might scrub
1388 * a route to another ifa which would
1389 * be confusing at best and possibly worse.
1391 if (cmd == RTM_DELETE) {
1393 * It's a delete, so it should already exist..
1394 * If it's a net, mask off the host bits
1395 * (Assuming we have a mask)
1396 * XXX this is kinda inet specific..
1398 if (netmask != NULL) {
1399 rt_maskedcopy(dst, (struct sockaddr *)tempbuf, netmask);
1400 dst = (struct sockaddr *)tempbuf;
1404 * Now go through all the requested tables (fibs) and do the
1405 * requested action. Realistically, this will either be fib 0
1406 * for protocols that don't do multiple tables or all the
1407 * tables for those that do. XXX For this version only AF_INET.
1408 * When that changes code should be refactored to protocol
1409 * independent parts and protocol dependent parts.
1411 for ( fibnum = startfib; fibnum <= endfib; fibnum++) {
1412 if (cmd == RTM_DELETE) {
1413 struct radix_node_head *rnh;
1414 struct radix_node *rn;
1416 * Look up an rtentry that is in the routing tree and
1417 * contains the correct info.
1419 rnh = rt_tables_get_rnh(fibnum, dst->sa_family);
1421 /* this table doesn't exist but others might */
1423 RADIX_NODE_HEAD_LOCK(rnh);
1425 if (rn_mpath_capable(rnh)) {
1427 rn = rnh->rnh_matchaddr(dst, rnh);
1433 * for interface route the
1434 * rt->rt_gateway is sockaddr_intf
1435 * for cloning ARP entries, so
1436 * rt_mpath_matchgate must use the
1439 rt = rt_mpath_matchgate(rt,
1447 rn = rnh->rnh_lookup(dst, netmask, rnh);
1448 error = (rn == NULL ||
1449 (rn->rn_flags & RNF_ROOT) ||
1450 RNTORT(rn)->rt_ifa != ifa ||
1451 !sa_equal((struct sockaddr *)rn->rn_key, dst));
1452 RADIX_NODE_HEAD_UNLOCK(rnh);
1454 /* this is only an error if bad on ALL tables */
1459 * Do the actual request
1461 bzero((caddr_t)&info, sizeof(info));
1463 info.rti_flags = flags | ifa->ifa_flags;
1464 info.rti_info[RTAX_DST] = dst;
1466 * doing this for compatibility reasons
1469 info.rti_info[RTAX_GATEWAY] =
1470 (struct sockaddr *)&null_sdl;
1472 info.rti_info[RTAX_GATEWAY] = ifa->ifa_addr;
1473 info.rti_info[RTAX_NETMASK] = netmask;
1474 error = rtrequest1_fib(cmd, &info, &rt, fibnum);
1475 if (error == 0 && rt != NULL) {
1477 * notify any listening routing agents of the change
1482 * in case address alias finds the first address
1483 * e.g. ifconfig bge0 192.103.54.246/24
1484 * e.g. ifconfig bge0 192.103.54.247/24
1485 * the address set in the route is 192.103.54.246
1486 * so we need to replace it with 192.103.54.247
1488 if (memcmp(rt->rt_ifa->ifa_addr,
1489 ifa->ifa_addr, ifa->ifa_addr->sa_len)) {
1490 ifa_free(rt->rt_ifa);
1492 rt->rt_ifp = ifa->ifa_ifp;
1497 * doing this for compatibility reasons
1499 if (cmd == RTM_ADD) {
1500 ((struct sockaddr_dl *)rt->rt_gateway)->sdl_type =
1501 rt->rt_ifp->if_type;
1502 ((struct sockaddr_dl *)rt->rt_gateway)->sdl_index =
1503 rt->rt_ifp->if_index;
1507 rt_newaddrmsg(cmd, ifa, error, rt);
1510 if (cmd == RTM_DELETE) {
1512 * If we are deleting, and we found an entry,
1513 * then it's been removed from the tree..
1514 * now throw it away.
1518 if (cmd == RTM_ADD) {
1520 * We just wanted to add it..
1521 * we don't actually need a reference.
1532 if (cmd == RTM_DELETE) {
1536 /* we only give an error if it wasn't in any table */
1537 error = ((flags & RTF_HOST) ?
1538 EHOSTUNREACH : ENETUNREACH);
1542 /* return an error if any of them failed */
1549 /* special one for inet internal use. may not use. */
1551 rtinit_fib(struct ifaddr *ifa, int cmd, int flags)
1553 return (rtinit1(ifa, cmd, flags, -1));
1557 * Set up a routing table entry, normally
1561 rtinit(struct ifaddr *ifa, int cmd, int flags)
1563 struct sockaddr *dst;
1566 if (flags & RTF_HOST) {
1567 dst = ifa->ifa_dstaddr;
1569 dst = ifa->ifa_addr;
1572 if (dst->sa_family == AF_INET)
1574 return (rtinit1(ifa, cmd, flags, fib));