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 * 3. 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_inet6.h"
39 #include "opt_route.h"
41 #include "opt_mrouting.h"
42 #include "opt_mpath.h"
44 #include <sys/param.h>
45 #include <sys/systm.h>
46 #include <sys/malloc.h>
48 #include <sys/socket.h>
49 #include <sys/sysctl.h>
50 #include <sys/syslog.h>
51 #include <sys/sysproto.h>
53 #include <sys/domain.h>
54 #include <sys/kernel.h>
57 #include <net/if_var.h>
58 #include <net/if_dl.h>
59 #include <net/route.h>
60 #include <net/route_var.h>
62 #include <net/flowtable.h>
65 #include <net/radix_mpath.h>
68 #include <netinet/in.h>
69 #include <netinet/ip_mroute.h>
73 #define RT_MAXFIBS UINT16_MAX
75 /* Kernel config default option. */
78 #error "ROUTETABLES defined too low"
80 #if ROUTETABLES > RT_MAXFIBS
81 #error "ROUTETABLES defined too big"
83 #define RT_NUMFIBS ROUTETABLES
84 #endif /* ROUTETABLES */
85 /* Initialize to default if not otherwise set. */
90 #if defined(INET) || defined(INET6)
92 extern void sctp_addr_change(struct ifaddr *ifa, int cmd);
97 /* This is read-only.. */
98 u_int rt_numfibs = RT_NUMFIBS;
99 SYSCTL_UINT(_net, OID_AUTO, fibs, CTLFLAG_RDTUN, &rt_numfibs, 0, "");
102 * By default add routes to all fibs for new interfaces.
103 * Once this is set to 0 then only allocate routes on interface
104 * changes for the FIB of the caller when adding a new set of addresses
105 * to an interface. XXX this is a shotgun aproach to a problem that needs
106 * a more fine grained solution.. that will come.
107 * XXX also has the problems getting the FIB from curthread which will not
108 * always work given the fib can be overridden and prefixes can be added
109 * from the network stack context.
111 VNET_DEFINE(u_int, rt_add_addr_allfibs) = 1;
112 SYSCTL_UINT(_net, OID_AUTO, add_addr_allfibs, CTLFLAG_RWTUN | CTLFLAG_VNET,
113 &VNET_NAME(rt_add_addr_allfibs), 0, "");
115 VNET_DEFINE(struct rtstat, rtstat);
116 #define V_rtstat VNET(rtstat)
118 VNET_DEFINE(struct rib_head *, rt_tables);
119 #define V_rt_tables VNET(rt_tables)
121 VNET_DEFINE(int, rttrash); /* routes not in table but not freed */
122 #define V_rttrash VNET(rttrash)
126 * Convert a 'struct radix_node *' to a 'struct rtentry *'.
127 * The operation can be done safely (in this code) because a
128 * 'struct rtentry' starts with two 'struct radix_node''s, the first
129 * one representing leaf nodes in the routing tree, which is
130 * what the code in radix.c passes us as a 'struct radix_node'.
132 * But because there are a lot of assumptions in this conversion,
133 * do not cast explicitly, but always use the macro below.
135 #define RNTORT(p) ((struct rtentry *)(p))
137 static VNET_DEFINE(uma_zone_t, rtzone); /* Routing table UMA zone. */
138 #define V_rtzone VNET(rtzone)
140 static int rtrequest1_fib_change(struct rib_head *, struct rt_addrinfo *,
141 struct rtentry **, u_int);
142 static void rt_setmetrics(const struct rt_addrinfo *, struct rtentry *);
143 static int rt_ifdelroute(const struct rtentry *rt, void *arg);
144 static struct rtentry *rt_unlinkrte(struct rib_head *rnh,
145 struct rt_addrinfo *info, int *perror);
146 static void rt_notifydelete(struct rtentry *rt, struct rt_addrinfo *info);
148 static struct radix_node *rt_mpath_unlink(struct rib_head *rnh,
149 struct rt_addrinfo *info, struct rtentry *rto, int *perror);
151 static int rt_exportinfo(struct rtentry *rt, struct rt_addrinfo *info,
160 static int if_updatemtu_cb(struct radix_node *, void *);
163 * handler for net.my_fibnum
166 sysctl_my_fibnum(SYSCTL_HANDLER_ARGS)
171 fibnum = curthread->td_proc->p_fibnum;
172 error = sysctl_handle_int(oidp, &fibnum, 0, req);
176 SYSCTL_PROC(_net, OID_AUTO, my_fibnum, CTLTYPE_INT|CTLFLAG_RD,
177 NULL, 0, &sysctl_my_fibnum, "I", "default FIB of caller");
179 static __inline struct rib_head **
180 rt_tables_get_rnh_ptr(int table, int fam)
182 struct rib_head **rnh;
184 KASSERT(table >= 0 && table < rt_numfibs, ("%s: table out of bounds.",
186 KASSERT(fam >= 0 && fam < (AF_MAX+1), ("%s: fam out of bounds.",
189 /* rnh is [fib=0][af=0]. */
190 rnh = (struct rib_head **)V_rt_tables;
191 /* Get the offset to the requested table and fam. */
192 rnh += table * (AF_MAX+1) + fam;
198 rt_tables_get_rnh(int table, int fam)
201 return (*rt_tables_get_rnh_ptr(table, fam));
205 rt_tables_get_gen(int table, int fam)
207 struct rib_head *rnh;
209 rnh = *rt_tables_get_rnh_ptr(table, fam);
210 KASSERT(rnh != NULL, ("%s: NULL rib_head pointer table %d fam %d",
211 __func__, table, fam));
212 return (rnh->rnh_gen);
217 * route initialization must occur before ip6_init2(), which happenas at
224 /* whack the tunable ints into line. */
225 if (rt_numfibs > RT_MAXFIBS)
226 rt_numfibs = RT_MAXFIBS;
230 SYSINIT(route_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, route_init, 0);
233 rtentry_zinit(void *mem, int size, int how)
235 struct rtentry *rt = mem;
237 rt->rt_pksent = counter_u64_alloc(how);
238 if (rt->rt_pksent == NULL)
247 rtentry_zfini(void *mem, int size)
249 struct rtentry *rt = mem;
252 counter_u64_free(rt->rt_pksent);
256 rtentry_ctor(void *mem, int size, void *arg, int how)
258 struct rtentry *rt = mem;
260 bzero(rt, offsetof(struct rtentry, rt_endzero));
261 counter_u64_zero(rt->rt_pksent);
268 rtentry_dtor(void *mem, int size, void *arg)
270 struct rtentry *rt = mem;
276 vnet_route_init(const void *unused __unused)
279 struct rib_head **rnh;
283 V_rt_tables = malloc(rt_numfibs * (AF_MAX+1) *
284 sizeof(struct rib_head *), M_RTABLE, M_WAITOK|M_ZERO);
286 V_rtzone = uma_zcreate("rtentry", sizeof(struct rtentry),
287 rtentry_ctor, rtentry_dtor,
288 rtentry_zinit, rtentry_zfini, UMA_ALIGN_PTR, 0);
289 for (dom = domains; dom; dom = dom->dom_next) {
290 if (dom->dom_rtattach == NULL)
293 for (table = 0; table < rt_numfibs; table++) {
294 fam = dom->dom_family;
295 if (table != 0 && fam != AF_INET6 && fam != AF_INET)
298 rnh = rt_tables_get_rnh_ptr(table, fam);
300 panic("%s: rnh NULL", __func__);
301 dom->dom_rtattach((void **)rnh, 0);
305 VNET_SYSINIT(vnet_route_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_FOURTH,
310 vnet_route_uninit(const void *unused __unused)
315 struct rib_head **rnh;
317 for (dom = domains; dom; dom = dom->dom_next) {
318 if (dom->dom_rtdetach == NULL)
321 for (table = 0; table < rt_numfibs; table++) {
322 fam = dom->dom_family;
324 if (table != 0 && fam != AF_INET6 && fam != AF_INET)
327 rnh = rt_tables_get_rnh_ptr(table, fam);
329 panic("%s: rnh NULL", __func__);
330 dom->dom_rtdetach((void **)rnh, 0);
334 free(V_rt_tables, M_RTABLE);
335 uma_zdestroy(V_rtzone);
337 VNET_SYSUNINIT(vnet_route_uninit, SI_SUB_PROTO_DOMAIN, SI_ORDER_FIRST,
338 vnet_route_uninit, 0);
342 rt_table_init(int offset)
346 rh = malloc(sizeof(struct rib_head), M_RTABLE, M_WAITOK | M_ZERO);
348 /* TODO: These details should be hidded inside radix.c */
349 /* Init masks tree */
350 rn_inithead_internal(&rh->head, rh->rnh_nodes, offset);
351 rn_inithead_internal(&rh->rmhead.head, rh->rmhead.mask_nodes, 0);
352 rh->head.rnh_masks = &rh->rmhead;
357 /* Finally, set base callbacks */
358 rh->rnh_addaddr = rn_addroute;
359 rh->rnh_deladdr = rn_delete;
360 rh->rnh_matchaddr = rn_match;
361 rh->rnh_lookup = rn_lookup;
362 rh->rnh_walktree = rn_walktree;
363 rh->rnh_walktree_from = rn_walktree_from;
369 rt_freeentry(struct radix_node *rn, void *arg)
371 struct radix_head * const rnh = arg;
372 struct radix_node *x;
374 x = (struct radix_node *)rn_delete(rn + 2, NULL, rnh);
381 rt_table_destroy(struct rib_head *rh)
384 rn_walktree(&rh->rmhead.head, rt_freeentry, &rh->rmhead.head);
386 /* Assume table is already empty */
387 RIB_LOCK_DESTROY(rh);
392 #ifndef _SYS_SYSPROTO_H_
398 sys_setfib(struct thread *td, struct setfib_args *uap)
400 if (uap->fibnum < 0 || uap->fibnum >= rt_numfibs)
402 td->td_proc->p_fibnum = uap->fibnum;
407 * Packet routing routines.
410 rtalloc_ign_fib(struct route *ro, u_long ignore, u_int fibnum)
414 if ((rt = ro->ro_rt) != NULL) {
415 if (rt->rt_ifp != NULL && rt->rt_flags & RTF_UP)
420 ro->ro_rt = rtalloc1_fib(&ro->ro_dst, 1, ignore, fibnum);
422 RT_UNLOCK(ro->ro_rt);
426 * Look up the route that matches the address given
427 * Or, at least try.. Create a cloned route if needed.
429 * The returned route, if any, is locked.
432 rtalloc1(struct sockaddr *dst, int report, u_long ignflags)
435 return (rtalloc1_fib(dst, report, ignflags, RT_DEFAULT_FIB));
439 rtalloc1_fib(struct sockaddr *dst, int report, u_long ignflags,
443 struct radix_node *rn;
444 struct rtentry *newrt;
445 struct rt_addrinfo info;
446 int err = 0, msgtype = RTM_MISS;
448 KASSERT((fibnum < rt_numfibs), ("rtalloc1_fib: bad fibnum"));
449 rh = rt_tables_get_rnh(fibnum, dst->sa_family);
455 * Look up the address in the table for that Address Family
457 if ((ignflags & RTF_RNH_LOCKED) == 0)
463 rn = rh->rnh_matchaddr(dst, &rh->head);
464 if (rn && ((rn->rn_flags & RNF_ROOT) == 0)) {
468 if ((ignflags & RTF_RNH_LOCKED) == 0)
472 } else if ((ignflags & RTF_RNH_LOCKED) == 0)
475 * Either we hit the root or could not find any match,
476 * which basically means: "cannot get there from here".
479 V_rtstat.rts_unreach++;
483 * If required, report the failure to the supervising
485 * For a delete, this is not an error. (report == 0)
487 bzero(&info, sizeof(info));
488 info.rti_info[RTAX_DST] = dst;
489 rt_missmsg_fib(msgtype, &info, 0, err, fibnum);
495 * Remove a reference count from an rtentry.
496 * If the count gets low enough, take it out of the routing table
499 rtfree(struct rtentry *rt)
501 struct rib_head *rnh;
503 KASSERT(rt != NULL,("%s: NULL rt", __func__));
504 rnh = rt_tables_get_rnh(rt->rt_fibnum, rt_key(rt)->sa_family);
505 KASSERT(rnh != NULL,("%s: NULL rnh", __func__));
510 * The callers should use RTFREE_LOCKED() or RTFREE(), so
511 * we should come here exactly with the last reference.
514 if (rt->rt_refcnt > 0) {
515 log(LOG_DEBUG, "%s: %p has %d refs\n", __func__, rt, rt->rt_refcnt);
520 * On last reference give the "close method" a chance
521 * to cleanup private state. This also permits (for
522 * IPv4 and IPv6) a chance to decide if the routing table
523 * entry should be purged immediately or at a later time.
524 * When an immediate purge is to happen the close routine
525 * typically calls rtexpunge which clears the RTF_UP flag
526 * on the entry so that the code below reclaims the storage.
528 if (rt->rt_refcnt == 0 && rnh->rnh_close)
529 rnh->rnh_close((struct radix_node *)rt, &rnh->head);
532 * If we are no longer "up" (and ref == 0)
533 * then we can free the resources associated
536 if ((rt->rt_flags & RTF_UP) == 0) {
537 if (rt->rt_nodes->rn_flags & (RNF_ACTIVE | RNF_ROOT))
540 * the rtentry must have been removed from the routing table
541 * so it is represented in rttrash.. remove that now.
545 if (rt->rt_refcnt < 0) {
546 printf("rtfree: %p not freed (neg refs)\n", rt);
551 * release references on items we hold them on..
552 * e.g other routes and ifaddrs.
555 ifa_free(rt->rt_ifa);
557 * The key is separatly alloc'd so free it (see rt_setgate()).
558 * This also frees the gateway, as they are always malloc'd
564 * and the rtentry itself of course
566 uma_zfree(V_rtzone, rt);
575 * Force a routing table entry to the specified
576 * destination to go through the given gateway.
577 * Normally called as a result of a routing redirect
578 * message from the network layer.
581 rtredirect_fib(struct sockaddr *dst,
582 struct sockaddr *gateway,
583 struct sockaddr *netmask,
585 struct sockaddr *src,
591 struct rt_addrinfo info;
593 struct rib_head *rnh;
596 rnh = rt_tables_get_rnh(fibnum, dst->sa_family);
598 error = EAFNOSUPPORT;
602 /* verify the gateway is directly reachable */
603 if ((ifa = ifa_ifwithnet(gateway, 0, fibnum)) == NULL) {
607 rt = rtalloc1_fib(dst, 0, 0UL, fibnum); /* NB: rt is locked */
609 * If the redirect isn't from our current router for this dst,
610 * it's either old or wrong. If it redirects us to ourselves,
611 * we have a routing loop, perhaps as a result of an interface
612 * going down recently.
614 if (!(flags & RTF_DONE) && rt) {
615 if (!sa_equal(src, rt->rt_gateway)) {
619 if (rt->rt_ifa != ifa && ifa->ifa_addr->sa_family != AF_LINK) {
624 if ((flags & RTF_GATEWAY) && ifa_ifwithaddr_check(gateway)) {
625 error = EHOSTUNREACH;
629 * Create a new entry if we just got back a wildcard entry
630 * or the lookup failed. This is necessary for hosts
631 * which use routing redirects generated by smart gateways
632 * to dynamically build the routing tables.
634 if (rt == NULL || (rt_mask(rt) && rt_mask(rt)->sa_len < 2))
637 * Don't listen to the redirect if it's
638 * for a route to an interface.
640 if (rt->rt_flags & RTF_GATEWAY) {
641 if (((rt->rt_flags & RTF_HOST) == 0) && (flags & RTF_HOST)) {
643 * Changing from route to net => route to host.
644 * Create new route, rather than smashing route to net.
650 flags |= RTF_DYNAMIC;
651 bzero((caddr_t)&info, sizeof(info));
652 info.rti_info[RTAX_DST] = dst;
653 info.rti_info[RTAX_GATEWAY] = gateway;
654 info.rti_info[RTAX_NETMASK] = netmask;
656 info.rti_flags = flags;
657 error = rtrequest1_fib(RTM_ADD, &info, &rt, fibnum);
660 flags = rt->rt_flags;
663 stat = &V_rtstat.rts_dynamic;
667 * Smash the current notion of the gateway to
668 * this destination. Should check about netmask!!!
670 if ((flags & RTF_GATEWAY) == 0)
671 rt->rt_flags &= ~RTF_GATEWAY;
672 rt->rt_flags |= RTF_MODIFIED;
673 flags |= RTF_MODIFIED;
674 stat = &V_rtstat.rts_newgateway;
676 * add the key and gateway (in one malloc'd chunk).
681 rt_setgate(rt, rt_key(rt), gateway);
685 error = EHOSTUNREACH;
691 V_rtstat.rts_badredirect++;
692 else if (stat != NULL)
694 bzero((caddr_t)&info, sizeof(info));
695 info.rti_info[RTAX_DST] = dst;
696 info.rti_info[RTAX_GATEWAY] = gateway;
697 info.rti_info[RTAX_NETMASK] = netmask;
698 info.rti_info[RTAX_AUTHOR] = src;
699 rt_missmsg_fib(RTM_REDIRECT, &info, flags, error, fibnum);
705 * Routing table ioctl interface.
708 rtioctl_fib(u_long req, caddr_t data, u_int fibnum)
712 * If more ioctl commands are added here, make sure the proper
713 * super-user checks are being performed because it is possible for
714 * prison-root to make it this far if raw sockets have been enabled
718 /* Multicast goop, grrr... */
719 return mrt_ioctl ? mrt_ioctl(req, data, fibnum) : EOPNOTSUPP;
726 ifa_ifwithroute(int flags, const struct sockaddr *dst, struct sockaddr *gateway,
732 if ((flags & RTF_GATEWAY) == 0) {
734 * If we are adding a route to an interface,
735 * and the interface is a pt to pt link
736 * we should search for the destination
737 * as our clue to the interface. Otherwise
738 * we can use the local address.
741 if (flags & RTF_HOST)
742 ifa = ifa_ifwithdstaddr(dst, fibnum);
744 ifa = ifa_ifwithaddr(gateway);
747 * If we are adding a route to a remote net
748 * or host, the gateway may still be on the
749 * other end of a pt to pt link.
751 ifa = ifa_ifwithdstaddr(gateway, fibnum);
754 ifa = ifa_ifwithnet(gateway, 0, fibnum);
758 rt = rtalloc1_fib(gateway, 0, flags, fibnum);
762 * dismiss a gateway that is reachable only
763 * through the default router
765 switch (gateway->sa_family) {
767 if (satosin(rt_key(rt))->sin_addr.s_addr == INADDR_ANY)
771 if (IN6_IS_ADDR_UNSPECIFIED(&satosin6(rt_key(rt))->sin6_addr))
777 if (!not_found && rt->rt_ifa != NULL) {
783 if (not_found || ifa == NULL)
786 if (ifa->ifa_addr->sa_family != dst->sa_family) {
787 struct ifaddr *oifa = ifa;
788 ifa = ifaof_ifpforaddr(dst, ifa->ifa_ifp);
798 * Do appropriate manipulations of a routing tree given
799 * all the bits of info needed
802 rtrequest_fib(int req,
803 struct sockaddr *dst,
804 struct sockaddr *gateway,
805 struct sockaddr *netmask,
807 struct rtentry **ret_nrt,
810 struct rt_addrinfo info;
812 if (dst->sa_len == 0)
815 bzero((caddr_t)&info, sizeof(info));
816 info.rti_flags = flags;
817 info.rti_info[RTAX_DST] = dst;
818 info.rti_info[RTAX_GATEWAY] = gateway;
819 info.rti_info[RTAX_NETMASK] = netmask;
820 return rtrequest1_fib(req, &info, ret_nrt, fibnum);
825 * Copy most of @rt data into @info.
827 * If @flags contains NHR_COPY, copies dst,netmask and gw to the
828 * pointers specified by @info structure. Assume such pointers
829 * are zeroed sockaddr-like structures with sa_len field initialized
830 * to reflect size of the provided buffer. if no NHR_COPY is specified,
831 * point dst,netmask and gw @info fields to appropriate @rt values.
833 * if @flags contains NHR_REF, do refcouting on rt_ifp.
835 * Returns 0 on success.
838 rt_exportinfo(struct rtentry *rt, struct rt_addrinfo *info, int flags)
840 struct rt_metrics *rmx;
841 struct sockaddr *src, *dst;
844 if (flags & NHR_COPY) {
845 /* Copy destination if dst is non-zero */
847 dst = info->rti_info[RTAX_DST];
848 sa_len = src->sa_len;
850 if (src->sa_len > dst->sa_len)
852 memcpy(dst, src, src->sa_len);
853 info->rti_addrs |= RTA_DST;
856 /* Copy mask if set && dst is non-zero */
858 dst = info->rti_info[RTAX_NETMASK];
859 if (src != NULL && dst != NULL) {
862 * Radix stores different value in sa_len,
863 * assume rt_mask() to have the same length
866 if (sa_len > dst->sa_len)
868 memcpy(dst, src, src->sa_len);
869 info->rti_addrs |= RTA_NETMASK;
872 /* Copy gateway is set && dst is non-zero */
873 src = rt->rt_gateway;
874 dst = info->rti_info[RTAX_GATEWAY];
875 if ((rt->rt_flags & RTF_GATEWAY) && src != NULL && dst != NULL){
876 if (src->sa_len > dst->sa_len)
878 memcpy(dst, src, src->sa_len);
879 info->rti_addrs |= RTA_GATEWAY;
882 info->rti_info[RTAX_DST] = rt_key(rt);
883 info->rti_addrs |= RTA_DST;
884 if (rt_mask(rt) != NULL) {
885 info->rti_info[RTAX_NETMASK] = rt_mask(rt);
886 info->rti_addrs |= RTA_NETMASK;
888 if (rt->rt_flags & RTF_GATEWAY) {
889 info->rti_info[RTAX_GATEWAY] = rt->rt_gateway;
890 info->rti_addrs |= RTA_GATEWAY;
896 info->rti_mflags |= RTV_MTU;
897 rmx->rmx_mtu = rt->rt_mtu;
900 info->rti_flags = rt->rt_flags;
901 info->rti_ifp = rt->rt_ifp;
902 info->rti_ifa = rt->rt_ifa;
904 if (flags & NHR_REF) {
905 /* Do 'traditional' refcouting */
906 if_ref(info->rti_ifp);
913 * Lookups up route entry for @dst in RIB database for fib @fibnum.
914 * Exports entry data to @info using rt_exportinfo().
916 * if @flags contains NHR_REF, refcouting is performed on rt_ifp.
917 * All references can be released later by calling rib_free_info()
919 * Returns 0 on success.
920 * Returns ENOENT for lookup failure, ENOMEM for export failure.
923 rib_lookup_info(uint32_t fibnum, const struct sockaddr *dst, uint32_t flags,
924 uint32_t flowid, struct rt_addrinfo *info)
927 struct radix_node *rn;
931 KASSERT((fibnum < rt_numfibs), ("rib_lookup_rte: bad fibnum"));
932 rh = rt_tables_get_rnh(fibnum, dst->sa_family);
937 rn = rh->rnh_matchaddr(__DECONST(void *, dst), &rh->head);
938 if (rn != NULL && ((rn->rn_flags & RNF_ROOT) == 0)) {
940 /* Ensure route & ifp is UP */
941 if (RT_LINK_IS_UP(rt->rt_ifp)) {
942 flags = (flags & NHR_REF) | NHR_COPY;
943 error = rt_exportinfo(rt, info, flags);
955 * Releases all references acquired by rib_lookup_info() when
956 * called with NHR_REF flags.
959 rib_free_info(struct rt_addrinfo *info)
962 if_rele(info->rti_ifp);
966 * Iterates over all existing fibs in system calling
967 * @setwa_f function prior to traversing each fib.
968 * Calls @wa_f function for each element in current fib.
969 * If af is not AF_UNSPEC, iterates over fibs in particular
973 rt_foreach_fib_walk(int af, rt_setwarg_t *setwa_f, rt_walktree_f_t *wa_f,
976 struct rib_head *rnh;
980 for (fibnum = 0; fibnum < rt_numfibs; fibnum++) {
981 /* Do we want some specific family? */
982 if (af != AF_UNSPEC) {
983 rnh = rt_tables_get_rnh(fibnum, af);
987 setwa_f(rnh, fibnum, af, arg);
990 rnh->rnh_walktree(&rnh->head, (walktree_f_t *)wa_f,arg);
995 for (i = 1; i <= AF_MAX; i++) {
996 rnh = rt_tables_get_rnh(fibnum, i);
1000 setwa_f(rnh, fibnum, i, arg);
1003 rnh->rnh_walktree(&rnh->head, (walktree_f_t *)wa_f,arg);
1011 struct rt_addrinfo info;
1012 struct rib_head *rnh;
1013 struct rtentry *head;
1017 * Conditionally unlinks @rn from radix tree based
1018 * on info data passed in @arg.
1021 rt_checkdelroute(struct radix_node *rn, void *arg)
1023 struct rt_delinfo *di;
1024 struct rt_addrinfo *info;
1028 di = (struct rt_delinfo *)arg;
1029 rt = (struct rtentry *)rn;
1033 info->rti_info[RTAX_DST] = rt_key(rt);
1034 info->rti_info[RTAX_NETMASK] = rt_mask(rt);
1035 info->rti_info[RTAX_GATEWAY] = rt->rt_gateway;
1037 rt = rt_unlinkrte(di->rnh, info, &error);
1039 /* Either not allowed or not matched. Skip entry */
1043 /* Entry was unlinked. Add to the list and return */
1044 rt->rt_chain = di->head;
1051 * Iterates over all existing fibs in system.
1052 * Deletes each element for which @filter_f function returned
1054 * If @af is not AF_UNSPEC, iterates over fibs in particular
1058 rt_foreach_fib_walk_del(int af, rt_filter_f_t *filter_f, void *arg)
1060 struct rib_head *rnh;
1061 struct rt_delinfo di;
1066 bzero(&di, sizeof(di));
1067 di.info.rti_filter = filter_f;
1068 di.info.rti_filterdata = arg;
1070 for (fibnum = 0; fibnum < rt_numfibs; fibnum++) {
1071 /* Do we want some specific family? */
1072 if (af != AF_UNSPEC) {
1080 for (i = start; i <= end; i++) {
1081 rnh = rt_tables_get_rnh(fibnum, i);
1087 rnh->rnh_walktree(&rnh->head, rt_checkdelroute, &di);
1090 if (di.head == NULL)
1093 /* We might have something to reclaim */
1094 while (di.head != NULL) {
1096 di.head = rt->rt_chain;
1097 rt->rt_chain = NULL;
1099 /* TODO std rt -> rt_addrinfo export */
1100 di.info.rti_info[RTAX_DST] = rt_key(rt);
1101 di.info.rti_info[RTAX_NETMASK] = rt_mask(rt);
1103 rt_notifydelete(rt, &di.info);
1112 * Delete Routes for a Network Interface
1114 * Called for each routing entry via the rnh->rnh_walktree() call above
1115 * to delete all route entries referencing a detaching network interface.
1118 * rt pointer to rtentry
1119 * arg argument passed to rnh->rnh_walktree() - detaching interface
1123 * errno failed - reason indicated
1126 rt_ifdelroute(const struct rtentry *rt, void *arg)
1128 struct ifnet *ifp = arg;
1130 if (rt->rt_ifp != ifp)
1134 * Protect (sorta) against walktree recursion problems
1135 * with cloned routes
1137 if ((rt->rt_flags & RTF_UP) == 0)
1144 * Delete all remaining routes using this interface
1145 * Unfortuneatly the only way to do this is to slog through
1146 * the entire routing table looking for routes which point
1147 * to this interface...oh well...
1150 rt_flushifroutes_af(struct ifnet *ifp, int af)
1152 KASSERT((af >= 1 && af <= AF_MAX), ("%s: af %d not >= 1 and <= %d",
1153 __func__, af, AF_MAX));
1155 rt_foreach_fib_walk_del(af, rt_ifdelroute, ifp);
1159 rt_flushifroutes(struct ifnet *ifp)
1162 rt_foreach_fib_walk_del(AF_UNSPEC, rt_ifdelroute, ifp);
1166 * Conditionally unlinks rtentry matching data inside @info from @rnh.
1167 * Returns unlinked, locked and referenced @rtentry on success,
1168 * Returns NULL and sets @perror to:
1169 * ESRCH - if prefix was not found,
1170 * EADDRINUSE - if trying to delete PINNED route without appropriate flag.
1171 * ENOENT - if supplied filter function returned 0 (not matched).
1173 static struct rtentry *
1174 rt_unlinkrte(struct rib_head *rnh, struct rt_addrinfo *info, int *perror)
1176 struct sockaddr *dst, *netmask;
1178 struct radix_node *rn;
1180 dst = info->rti_info[RTAX_DST];
1181 netmask = info->rti_info[RTAX_NETMASK];
1183 rt = (struct rtentry *)rnh->rnh_lookup(dst, netmask, &rnh->head);
1189 if ((info->rti_flags & RTF_PINNED) == 0) {
1190 /* Check if target route can be deleted */
1191 if (rt->rt_flags & RTF_PINNED) {
1192 *perror = EADDRINUSE;
1197 if (info->rti_filter != NULL) {
1198 if (info->rti_filter(rt, info->rti_filterdata) == 0) {
1205 * Filter function requested rte deletion.
1206 * Ease the caller work by filling in remaining info
1207 * from that particular entry.
1209 info->rti_info[RTAX_GATEWAY] = rt->rt_gateway;
1213 * Remove the item from the tree and return it.
1214 * Complain if it is not there and do no more processing.
1218 if (rt_mpath_capable(rnh))
1219 rn = rt_mpath_unlink(rnh, info, rt, perror);
1222 rn = rnh->rnh_deladdr(dst, netmask, &rnh->head);
1226 if (rn->rn_flags & (RNF_ACTIVE | RNF_ROOT))
1227 panic ("rtrequest delete");
1232 rt->rt_flags &= ~RTF_UP;
1240 rt_notifydelete(struct rtentry *rt, struct rt_addrinfo *info)
1245 * give the protocol a chance to keep things in sync.
1248 if (ifa != NULL && ifa->ifa_rtrequest != NULL)
1249 ifa->ifa_rtrequest(RTM_DELETE, rt, info);
1252 * One more rtentry floating around that is not
1253 * linked to the routing table. rttrash will be decremented
1254 * when RTFREE(rt) is eventually called.
1261 * These (questionable) definitions of apparent local variables apply
1262 * to the next two functions. XXXXXX!!!
1264 #define dst info->rti_info[RTAX_DST]
1265 #define gateway info->rti_info[RTAX_GATEWAY]
1266 #define netmask info->rti_info[RTAX_NETMASK]
1267 #define ifaaddr info->rti_info[RTAX_IFA]
1268 #define ifpaddr info->rti_info[RTAX_IFP]
1269 #define flags info->rti_flags
1272 * Look up rt_addrinfo for a specific fib. Note that if rti_ifa is defined,
1273 * it will be referenced so the caller must free it.
1276 rt_getifa_fib(struct rt_addrinfo *info, u_int fibnum)
1282 * ifp may be specified by sockaddr_dl
1283 * when protocol address is ambiguous.
1285 if (info->rti_ifp == NULL && ifpaddr != NULL &&
1286 ifpaddr->sa_family == AF_LINK &&
1287 (ifa = ifa_ifwithnet(ifpaddr, 0, fibnum)) != NULL) {
1288 info->rti_ifp = ifa->ifa_ifp;
1291 if (info->rti_ifa == NULL && ifaaddr != NULL)
1292 info->rti_ifa = ifa_ifwithaddr(ifaaddr);
1293 if (info->rti_ifa == NULL) {
1294 struct sockaddr *sa;
1296 sa = ifaaddr != NULL ? ifaaddr :
1297 (gateway != NULL ? gateway : dst);
1298 if (sa != NULL && info->rti_ifp != NULL)
1299 info->rti_ifa = ifaof_ifpforaddr(sa, info->rti_ifp);
1300 else if (dst != NULL && gateway != NULL)
1301 info->rti_ifa = ifa_ifwithroute(flags, dst, gateway,
1303 else if (sa != NULL)
1304 info->rti_ifa = ifa_ifwithroute(flags, sa, sa,
1307 if ((ifa = info->rti_ifa) != NULL) {
1308 if (info->rti_ifp == NULL)
1309 info->rti_ifp = ifa->ifa_ifp;
1311 error = ENETUNREACH;
1316 if_updatemtu_cb(struct radix_node *rn, void *arg)
1319 struct if_mtuinfo *ifmtu;
1321 rt = (struct rtentry *)rn;
1322 ifmtu = (struct if_mtuinfo *)arg;
1324 if (rt->rt_ifp != ifmtu->ifp)
1327 if (rt->rt_mtu >= ifmtu->mtu) {
1328 /* We have to decrease mtu regardless of flags */
1329 rt->rt_mtu = ifmtu->mtu;
1334 * New MTU is bigger. Check if are allowed to alter it
1336 if ((rt->rt_flags & (RTF_FIXEDMTU | RTF_GATEWAY | RTF_HOST)) != 0) {
1339 * Skip routes with user-supplied MTU and
1340 * non-interface routes
1345 /* We are safe to update route MTU */
1346 rt->rt_mtu = ifmtu->mtu;
1352 rt_updatemtu(struct ifnet *ifp)
1354 struct if_mtuinfo ifmtu;
1355 struct rib_head *rnh;
1361 * Try to update rt_mtu for all routes using this interface
1362 * Unfortunately the only way to do this is to traverse all
1363 * routing tables in all fibs/domains.
1365 for (i = 1; i <= AF_MAX; i++) {
1366 ifmtu.mtu = if_getmtu_family(ifp, i);
1367 for (j = 0; j < rt_numfibs; j++) {
1368 rnh = rt_tables_get_rnh(j, i);
1372 rnh->rnh_walktree(&rnh->head, if_updatemtu_cb, &ifmtu);
1380 int p_sockaddr(char *buf, int buflen, struct sockaddr *s);
1381 int rt_print(char *buf, int buflen, struct rtentry *rt);
1384 p_sockaddr(char *buf, int buflen, struct sockaddr *s)
1388 switch (s->sa_family) {
1390 paddr = &((struct sockaddr_in *)s)->sin_addr;
1393 paddr = &((struct sockaddr_in6 *)s)->sin6_addr;
1400 if (inet_ntop(s->sa_family, paddr, buf, buflen) == NULL)
1403 return (strlen(buf));
1407 rt_print(char *buf, int buflen, struct rtentry *rt)
1409 struct sockaddr *addr, *mask;
1415 i = p_sockaddr(buf, buflen, addr);
1416 if (!(rt->rt_flags & RTF_HOST)) {
1418 i += p_sockaddr(buf + i, buflen - i, mask);
1421 if (rt->rt_flags & RTF_GATEWAY) {
1423 i += p_sockaddr(buf + i, buflen - i, rt->rt_gateway);
1432 * Deletes key for single-path routes, unlinks rtentry with
1433 * gateway specified in @info from multi-path routes.
1435 * Returnes unlinked entry. In case of failure, returns NULL
1436 * and sets @perror to ESRCH.
1438 static struct radix_node *
1439 rt_mpath_unlink(struct rib_head *rnh, struct rt_addrinfo *info,
1440 struct rtentry *rto, int *perror)
1443 * if we got multipath routes, we require users to specify
1444 * a matching RTAX_GATEWAY.
1446 struct rtentry *rt; // *rto = NULL;
1447 struct radix_node *rn;
1448 struct sockaddr *gw;
1450 gw = info->rti_info[RTAX_GATEWAY];
1451 rt = rt_mpath_matchgate(rto, gw);
1458 * this is the first entry in the chain
1461 rn = rn_mpath_next((struct radix_node *)rt);
1463 * there is another entry, now it's active
1468 rto->rt_flags |= RTF_UP;
1470 } else if (rt->rt_flags & RTF_GATEWAY) {
1472 * For gateway routes, we need to
1473 * make sure that we we are deleting
1474 * the correct gateway.
1475 * rt_mpath_matchgate() does not
1476 * check the case when there is only
1477 * one route in the chain.
1480 (rt->rt_gateway->sa_len != gw->sa_len ||
1481 memcmp(rt->rt_gateway, gw, gw->sa_len))) {
1488 * use the normal delete code to remove
1491 rn = rnh->rnh_deladdr(dst, netmask, &rnh->head);
1497 * if the entry is 2nd and on up
1499 if (rt_mpath_deldup(rto, rt) == 0)
1500 panic ("rtrequest1: rt_mpath_deldup");
1502 rn = (struct radix_node *)rt;
1508 static struct rtentry *
1509 rt_flowtable_check_route(struct rib_head *rnh, struct rt_addrinfo *info)
1511 #if defined(INET6) || defined(INET)
1512 struct radix_node *rn;
1514 struct rtentry *rt0;
1517 /* "flow-table" only supports IPv6 and IPv4 at the moment. */
1518 switch (dst->sa_family) {
1525 #if defined(INET6) || defined(INET)
1526 rn = rnh->rnh_matchaddr(dst, &rnh->head);
1527 if (rn && ((rn->rn_flags & RNF_ROOT) == 0)) {
1528 struct sockaddr *mask;
1533 * compare mask to see if the new route is
1534 * more specific than the existing one
1541 * A host route is already present, so
1542 * leave the flow-table entries as is.
1544 if (rt0->rt_flags & RTF_HOST) {
1547 } else if (!(flags & RTF_HOST) && netmask) {
1548 mask = rt_mask(rt0);
1551 n = (u_char *)netmask;
1558 if (len == 0 || (*n < *m)) {
1564 #endif/* INET6 || INET */
1572 rtrequest1_fib(int req, struct rt_addrinfo *info, struct rtentry **ret_nrt,
1576 struct rtentry *rt, *rt_old;
1578 struct rtentry *rt0;
1580 struct radix_node *rn;
1581 struct rib_head *rnh;
1583 struct sockaddr *ndst;
1584 struct sockaddr_storage mdst;
1586 KASSERT((fibnum < rt_numfibs), ("rtrequest1_fib: bad fibnum"));
1587 KASSERT((flags & RTF_RNH_LOCKED) == 0, ("rtrequest1_fib: locked"));
1588 switch (dst->sa_family) {
1591 /* We support multiple FIBs. */
1594 fibnum = RT_DEFAULT_FIB;
1599 * Find the correct routing tree to use for this Address Family
1601 rnh = rt_tables_get_rnh(fibnum, dst->sa_family);
1603 return (EAFNOSUPPORT);
1606 * If we are adding a host route then we don't want to put
1607 * a netmask in the tree, nor do we want to clone it.
1609 if (flags & RTF_HOST)
1615 rt_maskedcopy(dst, (struct sockaddr *)&mdst, netmask);
1616 dst = (struct sockaddr *)&mdst;
1620 rt = rt_unlinkrte(rnh, info, &error);
1625 rt_notifydelete(rt, info);
1628 * If the caller wants it, then it can have it,
1629 * but it's up to it to free the rtentry as we won't be
1640 * resolve was only used for route cloning
1645 if ((flags & RTF_GATEWAY) && !gateway)
1647 if (dst && gateway && (dst->sa_family != gateway->sa_family) &&
1648 (gateway->sa_family != AF_UNSPEC) && (gateway->sa_family != AF_LINK))
1651 if (info->rti_ifa == NULL) {
1652 error = rt_getifa_fib(info, fibnum);
1656 ifa_ref(info->rti_ifa);
1657 ifa = info->rti_ifa;
1658 rt = uma_zalloc(V_rtzone, M_NOWAIT);
1663 rt->rt_flags = RTF_UP | flags;
1664 rt->rt_fibnum = fibnum;
1666 * Add the gateway. Possibly re-malloc-ing the storage for it.
1668 if ((error = rt_setgate(rt, dst, gateway)) != 0) {
1670 uma_zfree(V_rtzone, rt);
1675 * point to the (possibly newly malloc'd) dest address.
1677 ndst = (struct sockaddr *)rt_key(rt);
1680 * make sure it contains the value we want (masked if needed).
1683 rt_maskedcopy(dst, ndst, netmask);
1685 bcopy(dst, ndst, dst->sa_len);
1688 * We use the ifa reference returned by rt_getifa_fib().
1689 * This moved from below so that rnh->rnh_addaddr() can
1690 * examine the ifa and ifa->ifa_ifp if it so desires.
1693 rt->rt_ifp = ifa->ifa_ifp;
1696 rt_setmetrics(info, rt);
1701 /* do not permit exactly the same dst/mask/gw pair */
1702 if (rt_mpath_capable(rnh) &&
1703 rt_mpath_conflict(rnh, rt, netmask)) {
1706 ifa_free(rt->rt_ifa);
1708 uma_zfree(V_rtzone, rt);
1714 rt0 = rt_flowtable_check_route(rnh, info);
1715 #endif /* FLOWTABLE */
1717 /* XXX mtu manipulation will be done in rnh_addaddr -- itojun */
1718 rn = rnh->rnh_addaddr(ndst, netmask, &rnh->head, rt->rt_nodes);
1721 if (rn == NULL && (info->rti_flags & RTF_PINNED) != 0) {
1724 * Force removal and re-try addition
1725 * TODO: better multipath&pinned support
1727 struct sockaddr *info_dst = info->rti_info[RTAX_DST];
1728 info->rti_info[RTAX_DST] = ndst;
1729 /* Do not delete existing PINNED(interface) routes */
1730 info->rti_flags &= ~RTF_PINNED;
1731 rt_old = rt_unlinkrte(rnh, info, &error);
1732 info->rti_flags |= RTF_PINNED;
1733 info->rti_info[RTAX_DST] = info_dst;
1735 rn = rnh->rnh_addaddr(ndst, netmask, &rnh->head,
1744 * If it still failed to go into the tree,
1745 * then un-make it (this should be a function)
1748 ifa_free(rt->rt_ifa);
1750 uma_zfree(V_rtzone, rt);
1758 else if (rt0 != NULL) {
1759 flowtable_route_flush(dst->sa_family, rt0);
1764 if (rt_old != NULL) {
1765 rt_notifydelete(rt_old, info);
1770 * If this protocol has something to add to this then
1771 * allow it to do that as well.
1773 if (ifa->ifa_rtrequest)
1774 ifa->ifa_rtrequest(req, rt, info);
1777 * actually return a resultant rtentry and
1778 * give the caller a single reference.
1784 rnh->rnh_gen++; /* Routing table updated */
1789 error = rtrequest1_fib_change(rnh, info, ret_nrt, fibnum);
1807 rtrequest1_fib_change(struct rib_head *rnh, struct rt_addrinfo *info,
1808 struct rtentry **ret_nrt, u_int fibnum)
1810 struct rtentry *rt = NULL;
1814 struct if_mtuinfo ifmtu;
1816 rt = (struct rtentry *)rnh->rnh_lookup(info->rti_info[RTAX_DST],
1817 info->rti_info[RTAX_NETMASK], &rnh->head);
1824 * If we got multipath routes,
1825 * we require users to specify a matching RTAX_GATEWAY.
1827 if (rt_mpath_capable(rnh)) {
1828 rt = rt_mpath_matchgate(rt, info->rti_info[RTAX_GATEWAY]);
1836 rt_setmetrics(info, rt);
1839 * New gateway could require new ifaddr, ifp;
1840 * flags may also be different; ifp may be specified
1841 * by ll sockaddr when protocol address is ambiguous
1843 if (((rt->rt_flags & RTF_GATEWAY) &&
1844 info->rti_info[RTAX_GATEWAY] != NULL) ||
1845 info->rti_info[RTAX_IFP] != NULL ||
1846 (info->rti_info[RTAX_IFA] != NULL &&
1847 !sa_equal(info->rti_info[RTAX_IFA], rt->rt_ifa->ifa_addr))) {
1849 * XXX: Temporarily set RTF_RNH_LOCKED flag in the rti_flags
1850 * to avoid rlock in the ifa_ifwithroute().
1852 info->rti_flags |= RTF_RNH_LOCKED;
1853 error = rt_getifa_fib(info, fibnum);
1854 info->rti_flags &= ~RTF_RNH_LOCKED;
1855 if (info->rti_ifa != NULL)
1862 /* Check if outgoing interface has changed */
1863 if (info->rti_ifa != NULL && info->rti_ifa != rt->rt_ifa &&
1864 rt->rt_ifa != NULL && rt->rt_ifa->ifa_rtrequest != NULL) {
1865 rt->rt_ifa->ifa_rtrequest(RTM_DELETE, rt, info);
1866 ifa_free(rt->rt_ifa);
1868 /* Update gateway address */
1869 if (info->rti_info[RTAX_GATEWAY] != NULL) {
1870 error = rt_setgate(rt, rt_key(rt), info->rti_info[RTAX_GATEWAY]);
1874 rt->rt_flags &= ~RTF_GATEWAY;
1875 rt->rt_flags |= (RTF_GATEWAY & info->rti_flags);
1878 if (info->rti_ifa != NULL && info->rti_ifa != rt->rt_ifa) {
1879 ifa_ref(info->rti_ifa);
1880 rt->rt_ifa = info->rti_ifa;
1881 rt->rt_ifp = info->rti_ifp;
1883 /* Allow some flags to be toggled on change. */
1884 rt->rt_flags &= ~RTF_FMASK;
1885 rt->rt_flags |= info->rti_flags & RTF_FMASK;
1887 if (rt->rt_ifa && rt->rt_ifa->ifa_rtrequest != NULL)
1888 rt->rt_ifa->ifa_rtrequest(RTM_ADD, rt, info);
1890 /* Alter route MTU if necessary */
1891 if (rt->rt_ifp != NULL) {
1892 family = info->rti_info[RTAX_DST]->sa_family;
1893 mtu = if_getmtu_family(rt->rt_ifp, family);
1894 /* Set default MTU */
1895 if (rt->rt_mtu == 0)
1897 if (rt->rt_mtu != mtu) {
1898 /* Check if we really need to update */
1899 ifmtu.ifp = rt->rt_ifp;
1901 if_updatemtu_cb(rt->rt_nodes, &ifmtu);
1912 ifa_free(info->rti_ifa);
1917 rt_setmetrics(const struct rt_addrinfo *info, struct rtentry *rt)
1920 if (info->rti_mflags & RTV_MTU) {
1921 if (info->rti_rmx->rmx_mtu != 0) {
1924 * MTU was explicitly provided by user.
1927 rt->rt_flags |= RTF_FIXEDMTU;
1931 * User explicitly sets MTU to 0.
1932 * Assume rollback to default.
1934 rt->rt_flags &= ~RTF_FIXEDMTU;
1936 rt->rt_mtu = info->rti_rmx->rmx_mtu;
1938 if (info->rti_mflags & RTV_WEIGHT)
1939 rt->rt_weight = info->rti_rmx->rmx_weight;
1940 /* Kernel -> userland timebase conversion. */
1941 if (info->rti_mflags & RTV_EXPIRE)
1942 rt->rt_expire = info->rti_rmx->rmx_expire ?
1943 info->rti_rmx->rmx_expire - time_second + time_uptime : 0;
1947 rt_setgate(struct rtentry *rt, struct sockaddr *dst, struct sockaddr *gate)
1949 /* XXX dst may be overwritten, can we move this to below */
1950 int dlen = SA_SIZE(dst), glen = SA_SIZE(gate);
1953 * Prepare to store the gateway in rt->rt_gateway.
1954 * Both dst and gateway are stored one after the other in the same
1955 * malloc'd chunk. If we have room, we can reuse the old buffer,
1956 * rt_gateway already points to the right place.
1957 * Otherwise, malloc a new block and update the 'dst' address.
1959 if (rt->rt_gateway == NULL || glen > SA_SIZE(rt->rt_gateway)) {
1962 R_Malloc(new, caddr_t, dlen + glen);
1966 * XXX note, we copy from *dst and not *rt_key(rt) because
1967 * rt_setgate() can be called to initialize a newly
1968 * allocated route entry, in which case rt_key(rt) == NULL
1969 * (and also rt->rt_gateway == NULL).
1970 * Free()/free() handle a NULL argument just fine.
1972 bcopy(dst, new, dlen);
1973 R_Free(rt_key(rt)); /* free old block, if any */
1974 rt_key(rt) = (struct sockaddr *)new;
1975 rt->rt_gateway = (struct sockaddr *)(new + dlen);
1979 * Copy the new gateway value into the memory chunk.
1981 bcopy(gate, rt->rt_gateway, glen);
1987 rt_maskedcopy(struct sockaddr *src, struct sockaddr *dst, struct sockaddr *netmask)
1989 u_char *cp1 = (u_char *)src;
1990 u_char *cp2 = (u_char *)dst;
1991 u_char *cp3 = (u_char *)netmask;
1992 u_char *cplim = cp2 + *cp3;
1993 u_char *cplim2 = cp2 + *cp1;
1995 *cp2++ = *cp1++; *cp2++ = *cp1++; /* copies sa_len & sa_family */
2000 *cp2++ = *cp1++ & *cp3++;
2002 bzero((caddr_t)cp2, (unsigned)(cplim2 - cp2));
2006 * Set up a routing table entry, normally
2009 #define _SOCKADDR_TMPSIZE 128 /* Not too big.. kernel stack size is limited */
2011 rtinit1(struct ifaddr *ifa, int cmd, int flags, int fibnum)
2013 struct sockaddr *dst;
2014 struct sockaddr *netmask;
2015 struct rtentry *rt = NULL;
2016 struct rt_addrinfo info;
2018 int startfib, endfib;
2019 char tempbuf[_SOCKADDR_TMPSIZE];
2022 static struct sockaddr_dl null_sdl = {sizeof(null_sdl), AF_LINK};
2023 struct rib_head *rnh;
2025 if (flags & RTF_HOST) {
2026 dst = ifa->ifa_dstaddr;
2029 dst = ifa->ifa_addr;
2030 netmask = ifa->ifa_netmask;
2032 if (dst->sa_len == 0)
2034 switch (dst->sa_family) {
2037 /* We support multiple FIBs. */
2040 fibnum = RT_DEFAULT_FIB;
2043 if (fibnum == RT_ALL_FIBS) {
2044 if (V_rt_add_addr_allfibs == 0 && cmd == (int)RTM_ADD)
2045 startfib = endfib = ifa->ifa_ifp->if_fib;
2048 endfib = rt_numfibs - 1;
2051 KASSERT((fibnum < rt_numfibs), ("rtinit1: bad fibnum"));
2057 * If it's a delete, check that if it exists,
2058 * it's on the correct interface or we might scrub
2059 * a route to another ifa which would
2060 * be confusing at best and possibly worse.
2062 if (cmd == RTM_DELETE) {
2064 * It's a delete, so it should already exist..
2065 * If it's a net, mask off the host bits
2066 * (Assuming we have a mask)
2067 * XXX this is kinda inet specific..
2069 if (netmask != NULL) {
2070 rt_maskedcopy(dst, (struct sockaddr *)tempbuf, netmask);
2071 dst = (struct sockaddr *)tempbuf;
2075 * Now go through all the requested tables (fibs) and do the
2076 * requested action. Realistically, this will either be fib 0
2077 * for protocols that don't do multiple tables or all the
2078 * tables for those that do.
2080 for ( fibnum = startfib; fibnum <= endfib; fibnum++) {
2081 if (cmd == RTM_DELETE) {
2082 struct radix_node *rn;
2084 * Look up an rtentry that is in the routing tree and
2085 * contains the correct info.
2087 rnh = rt_tables_get_rnh(fibnum, dst->sa_family);
2089 /* this table doesn't exist but others might */
2092 rn = rnh->rnh_lookup(dst, netmask, &rnh->head);
2094 if (rt_mpath_capable(rnh)) {
2101 * for interface route the
2102 * rt->rt_gateway is sockaddr_intf
2103 * for cloning ARP entries, so
2104 * rt_mpath_matchgate must use the
2107 rt = rt_mpath_matchgate(rt,
2114 error = (rn == NULL ||
2115 (rn->rn_flags & RNF_ROOT) ||
2116 RNTORT(rn)->rt_ifa != ifa);
2119 /* this is only an error if bad on ALL tables */
2124 * Do the actual request
2126 bzero((caddr_t)&info, sizeof(info));
2128 info.rti_flags = flags |
2129 (ifa->ifa_flags & ~IFA_RTSELF) | RTF_PINNED;
2130 info.rti_info[RTAX_DST] = dst;
2132 * doing this for compatibility reasons
2135 info.rti_info[RTAX_GATEWAY] =
2136 (struct sockaddr *)&null_sdl;
2138 info.rti_info[RTAX_GATEWAY] = ifa->ifa_addr;
2139 info.rti_info[RTAX_NETMASK] = netmask;
2140 error = rtrequest1_fib(cmd, &info, &rt, fibnum);
2142 if (error == 0 && rt != NULL) {
2144 * notify any listening routing agents of the change
2149 * in case address alias finds the first address
2150 * e.g. ifconfig bge0 192.0.2.246/24
2151 * e.g. ifconfig bge0 192.0.2.247/24
2152 * the address set in the route is 192.0.2.246
2153 * so we need to replace it with 192.0.2.247
2155 if (memcmp(rt->rt_ifa->ifa_addr,
2156 ifa->ifa_addr, ifa->ifa_addr->sa_len)) {
2157 ifa_free(rt->rt_ifa);
2159 rt->rt_ifp = ifa->ifa_ifp;
2164 * doing this for compatibility reasons
2166 if (cmd == RTM_ADD) {
2167 ((struct sockaddr_dl *)rt->rt_gateway)->sdl_type =
2168 rt->rt_ifp->if_type;
2169 ((struct sockaddr_dl *)rt->rt_gateway)->sdl_index =
2170 rt->rt_ifp->if_index;
2174 rt_newaddrmsg_fib(cmd, ifa, error, rt, fibnum);
2177 if (cmd == RTM_DELETE) {
2179 * If we are deleting, and we found an entry,
2180 * then it's been removed from the tree..
2181 * now throw it away.
2185 if (cmd == RTM_ADD) {
2187 * We just wanted to add it..
2188 * we don't actually need a reference.
2199 if (cmd == RTM_DELETE) {
2203 /* we only give an error if it wasn't in any table */
2204 error = ((flags & RTF_HOST) ?
2205 EHOSTUNREACH : ENETUNREACH);
2209 /* return an error if any of them failed */
2217 * Set up a routing table entry, normally
2221 rtinit(struct ifaddr *ifa, int cmd, int flags)
2223 struct sockaddr *dst;
2224 int fib = RT_DEFAULT_FIB;
2226 if (flags & RTF_HOST) {
2227 dst = ifa->ifa_dstaddr;
2229 dst = ifa->ifa_addr;
2232 switch (dst->sa_family) {
2235 /* We do support multiple FIBs. */
2239 return (rtinit1(ifa, cmd, flags, fib));
2243 * Announce interface address arrival/withdraw
2244 * Returns 0 on success.
2247 rt_addrmsg(int cmd, struct ifaddr *ifa, int fibnum)
2250 KASSERT(cmd == RTM_ADD || cmd == RTM_DELETE,
2251 ("unexpected cmd %d", cmd));
2253 KASSERT(fibnum == RT_ALL_FIBS || (fibnum >= 0 && fibnum < rt_numfibs),
2254 ("%s: fib out of range 0 <=%d<%d", __func__, fibnum, rt_numfibs));
2256 #if defined(INET) || defined(INET6)
2259 * notify the SCTP stack
2260 * this will only get called when an address is added/deleted
2261 * XXX pass the ifaddr struct instead if ifa->ifa_addr...
2263 sctp_addr_change(ifa, cmd);
2266 return (rtsock_addrmsg(cmd, ifa, fibnum));
2270 * Announce route addition/removal.
2271 * Users of this function MUST validate input data BEFORE calling.
2272 * However we have to be able to handle invalid data:
2273 * if some userland app sends us "invalid" route message (invalid mask,
2274 * no dst, wrong address families, etc...) we need to pass it back
2275 * to app (and any other rtsock consumers) with rtm_errno field set to
2277 * Returns 0 on success.
2280 rt_routemsg(int cmd, struct ifnet *ifp, int error, struct rtentry *rt,
2284 KASSERT(cmd == RTM_ADD || cmd == RTM_DELETE,
2285 ("unexpected cmd %d", cmd));
2287 KASSERT(fibnum == RT_ALL_FIBS || (fibnum >= 0 && fibnum < rt_numfibs),
2288 ("%s: fib out of range 0 <=%d<%d", __func__, fibnum, rt_numfibs));
2290 KASSERT(rt_key(rt) != NULL, (":%s: rt_key must be supplied", __func__));
2292 return (rtsock_routemsg(cmd, ifp, error, rt, fibnum));
2296 rt_newaddrmsg(int cmd, struct ifaddr *ifa, int error, struct rtentry *rt)
2299 rt_newaddrmsg_fib(cmd, ifa, error, rt, RT_ALL_FIBS);
2303 * This is called to generate messages from the routing socket
2304 * indicating a network interface has had addresses associated with it.
2307 rt_newaddrmsg_fib(int cmd, struct ifaddr *ifa, int error, struct rtentry *rt,
2311 KASSERT(cmd == RTM_ADD || cmd == RTM_DELETE,
2312 ("unexpected cmd %u", cmd));
2313 KASSERT(fibnum == RT_ALL_FIBS || (fibnum >= 0 && fibnum < rt_numfibs),
2314 ("%s: fib out of range 0 <=%d<%d", __func__, fibnum, rt_numfibs));
2316 if (cmd == RTM_ADD) {
2317 rt_addrmsg(cmd, ifa, fibnum);
2319 rt_routemsg(cmd, ifa->ifa_ifp, error, rt, fibnum);
2322 rt_routemsg(cmd, ifa->ifa_ifp, error, rt, fibnum);
2323 rt_addrmsg(cmd, ifa, fibnum);