2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 1980, 1986, 1991, 1993
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8 * modification, are permitted provided that the following conditions
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31 * @(#)route.c 8.3.1.1 (Berkeley) 2/23/95
34 /************************************************************************
35 * Note: In this file a 'fib' is a "forwarding information base" *
36 * Which is the new name for an in kernel routing (next hop) table. *
37 ***********************************************************************/
40 #include "opt_inet6.h"
41 #include "opt_mrouting.h"
42 #include "opt_route.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/eventhandler.h>
55 #include <sys/kernel.h>
57 #include <sys/rmlock.h>
60 #include <net/if_var.h>
61 #include <net/if_dl.h>
62 #include <net/route.h>
63 #include <net/route/route_ctl.h>
64 #include <net/route/route_var.h>
65 #include <net/route/nhop.h>
68 #include <netinet/in.h>
69 #include <netinet/ip_mroute.h>
71 VNET_PCPUSTAT_DEFINE(struct rtstat, rtstat);
73 VNET_PCPUSTAT_SYSINIT(rtstat);
75 VNET_PCPUSTAT_SYSUNINIT(rtstat);
78 EVENTHANDLER_LIST_DEFINE(rt_addrmsg);
80 static int rt_ifdelroute(const struct rtentry *rt, const struct nhop_object *,
82 static int rt_exportinfo(struct rtentry *rt, struct nhop_object *nh,
83 struct rt_addrinfo *info, int flags);
86 * route initialization must occur before ip6_init2(), which happenas at
95 SYSINIT(route_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, route_init, NULL);
98 rt_table_init(int offset, int family, u_int fibnum)
102 rh = malloc(sizeof(struct rib_head), M_RTABLE, M_WAITOK | M_ZERO);
104 /* TODO: These details should be hidded inside radix.c */
105 /* Init masks tree */
106 rn_inithead_internal(&rh->head, rh->rnh_nodes, offset);
107 rn_inithead_internal(&rh->rmhead.head, rh->rmhead.mask_nodes, 0);
108 rh->head.rnh_masks = &rh->rmhead;
110 /* Save metadata associated with this routing table. */
111 rh->rib_family = family;
112 rh->rib_fibnum = fibnum;
114 rh->rib_vnet = curvnet;
124 /* Init subscription system */
125 rib_init_subscriptions(rh);
127 /* Finally, set base callbacks */
128 rh->rnh_addaddr = rn_addroute;
129 rh->rnh_deladdr = rn_delete;
130 rh->rnh_matchaddr = rn_match;
131 rh->rnh_lookup = rn_lookup;
132 rh->rnh_walktree = rn_walktree;
133 rh->rnh_walktree_from = rn_walktree_from;
139 rt_freeentry(struct radix_node *rn, void *arg)
141 struct radix_head * const rnh = arg;
142 struct radix_node *x;
144 x = (struct radix_node *)rn_delete(rn + 2, NULL, rnh);
151 rt_table_destroy(struct rib_head *rh)
155 rh->rib_dying = true;
162 tmproutes_destroy(rh);
164 rn_walktree(&rh->rmhead.head, rt_freeentry, &rh->rmhead.head);
166 nhops_destroy_rib(rh);
168 rib_destroy_subscriptions(rh);
170 /* Assume table is already empty */
171 RIB_LOCK_DESTROY(rh);
176 * Adds a temporal redirect entry to the routing table.
177 * @fibnum: fib number
178 * @dst: destination to install redirect to
179 * @gateway: gateway to go via
180 * @author: sockaddr of originating router, can be NULL
181 * @ifp: interface to use for the redirected route
182 * @flags: set of flags to add. Allowed: RTF_GATEWAY
183 * @lifetime_sec: time in seconds to expire this redirect.
185 * Retuns 0 on success, errno otherwise.
188 rib_add_redirect(u_int fibnum, struct sockaddr *dst, struct sockaddr *gateway,
189 struct sockaddr *author, struct ifnet *ifp, int flags, int lifetime_sec)
191 struct route_nhop_data rnd = { .rnd_weight = RT_DEFAULT_WEIGHT };
192 struct rib_cmd_info rc;
198 if (rt_tables_get_rnh(fibnum, dst->sa_family) == NULL)
199 return (EAFNOSUPPORT);
201 /* Verify the allowed flag mask. */
202 KASSERT(((flags & ~(RTF_GATEWAY)) == 0),
203 ("invalid redirect flags: %x", flags));
204 flags |= RTF_HOST | RTF_DYNAMIC;
206 /* Get the best ifa for the given interface and gateway. */
207 if ((ifa = ifaof_ifpforaddr(gateway, ifp)) == NULL)
208 return (ENETUNREACH);
210 struct nhop_object *nh = nhop_alloc(fibnum, dst->sa_family);
214 nhop_set_gw(nh, gateway, flags & RTF_GATEWAY);
215 nhop_set_transmit_ifp(nh, ifp);
216 nhop_set_src(nh, ifa);
217 nhop_set_pxtype_flag(nh, NHF_HOST);
218 nhop_set_expire(nh, lifetime_sec + time_uptime);
219 nhop_set_redirect(nh, true);
220 nhop_set_origin(nh, NH_ORIGIN_REDIRECT);
221 rnd.rnd_nhop = nhop_get_nhop(nh, &error);
223 error = rib_add_route_px(fibnum, dst, -1,
224 &rnd, RTM_F_CREATE, &rc);
228 /* TODO: add per-fib redirect stats. */
232 RTSTAT_INC(rts_dynamic);
234 /* Send notification of a route addition to userland. */
235 struct rt_addrinfo info = {
236 .rti_info[RTAX_DST] = dst,
237 .rti_info[RTAX_GATEWAY] = gateway,
238 .rti_info[RTAX_AUTHOR] = author,
240 rt_missmsg_fib(RTM_REDIRECT, &info, flags | RTF_UP, error, fibnum);
246 * Routing table ioctl interface.
249 rtioctl_fib(u_long req, caddr_t data, u_int fibnum)
253 * If more ioctl commands are added here, make sure the proper
254 * super-user checks are being performed because it is possible for
255 * prison-root to make it this far if raw sockets have been enabled
259 /* Multicast goop, grrr... */
260 return mrt_ioctl ? mrt_ioctl(req, data, fibnum) : EOPNOTSUPP;
267 ifa_ifwithroute(int flags, const struct sockaddr *dst,
268 const struct sockaddr *gateway, u_int fibnum)
273 if ((flags & RTF_GATEWAY) == 0) {
275 * If we are adding a route to an interface,
276 * and the interface is a pt to pt link
277 * we should search for the destination
278 * as our clue to the interface. Otherwise
279 * we can use the local address.
282 if (flags & RTF_HOST)
283 ifa = ifa_ifwithdstaddr(dst, fibnum);
285 ifa = ifa_ifwithaddr(gateway);
288 * If we are adding a route to a remote net
289 * or host, the gateway may still be on the
290 * other end of a pt to pt link.
292 ifa = ifa_ifwithdstaddr(gateway, fibnum);
295 ifa = ifa_ifwithnet(gateway, 0, fibnum);
297 struct nhop_object *nh;
299 nh = rib_lookup(fibnum, gateway, NHR_NONE, 0);
302 * dismiss a gateway that is reachable only
303 * through the default router
305 if ((nh == NULL) || (nh->nh_flags & NHF_DEFAULT))
309 if (ifa->ifa_addr->sa_family != dst->sa_family) {
310 struct ifaddr *oifa = ifa;
311 ifa = ifaof_ifpforaddr(dst, ifa->ifa_ifp);
320 * Copy most of @rt data into @info.
322 * If @flags contains NHR_COPY, copies dst,netmask and gw to the
323 * pointers specified by @info structure. Assume such pointers
324 * are zeroed sockaddr-like structures with sa_len field initialized
325 * to reflect size of the provided buffer. if no NHR_COPY is specified,
326 * point dst,netmask and gw @info fields to appropriate @rt values.
328 * if @flags contains NHR_REF, do refcouting on rt_ifp and rt_ifa.
330 * Returns 0 on success.
333 rt_exportinfo(struct rtentry *rt, struct nhop_object *nh,
334 struct rt_addrinfo *info, int flags)
336 struct rt_metrics *rmx;
337 struct sockaddr *src, *dst;
340 if (flags & NHR_COPY) {
341 /* Copy destination if dst is non-zero */
343 dst = info->rti_info[RTAX_DST];
344 sa_len = src->sa_len;
346 if (src->sa_len > dst->sa_len)
348 memcpy(dst, src, src->sa_len);
349 info->rti_addrs |= RTA_DST;
352 /* Copy mask if set && dst is non-zero */
354 dst = info->rti_info[RTAX_NETMASK];
355 if (src != NULL && dst != NULL) {
357 * Radix stores different value in sa_len,
358 * assume rt_mask() to have the same length
361 if (sa_len > dst->sa_len)
363 memcpy(dst, src, src->sa_len);
364 info->rti_addrs |= RTA_NETMASK;
367 /* Copy gateway is set && dst is non-zero */
369 dst = info->rti_info[RTAX_GATEWAY];
370 if ((nhop_get_rtflags(nh) & RTF_GATEWAY) &&
371 src != NULL && dst != NULL) {
372 if (src->sa_len > dst->sa_len)
374 memcpy(dst, src, src->sa_len);
375 info->rti_addrs |= RTA_GATEWAY;
378 info->rti_info[RTAX_DST] = rt_key(rt);
379 info->rti_addrs |= RTA_DST;
380 if (rt_mask(rt) != NULL) {
381 info->rti_info[RTAX_NETMASK] = rt_mask(rt);
382 info->rti_addrs |= RTA_NETMASK;
384 if (nhop_get_rtflags(nh) & RTF_GATEWAY) {
385 info->rti_info[RTAX_GATEWAY] = &nh->gw_sa;
386 info->rti_addrs |= RTA_GATEWAY;
392 info->rti_mflags |= RTV_MTU;
393 rmx->rmx_mtu = nh->nh_mtu;
396 info->rti_flags = rt->rte_flags | nhop_get_rtflags(nh);
397 info->rti_ifp = nh->nh_ifp;
398 info->rti_ifa = nh->nh_ifa;
399 if (flags & NHR_REF) {
400 if_ref(info->rti_ifp);
401 ifa_ref(info->rti_ifa);
408 * Lookups up route entry for @dst in RIB database for fib @fibnum.
409 * Exports entry data to @info using rt_exportinfo().
411 * If @flags contains NHR_REF, refcouting is performed on rt_ifp and rt_ifa.
412 * All references can be released later by calling rib_free_info().
414 * Returns 0 on success.
415 * Returns ENOENT for lookup failure, ENOMEM for export failure.
418 rib_lookup_info(uint32_t fibnum, const struct sockaddr *dst, uint32_t flags,
419 uint32_t flowid, struct rt_addrinfo *info)
423 struct radix_node *rn;
425 struct nhop_object *nh;
428 KASSERT((fibnum < rt_numfibs), ("rib_lookup_rte: bad fibnum"));
429 rh = rt_tables_get_rnh(fibnum, dst->sa_family);
434 rn = rh->rnh_matchaddr(__DECONST(void *, dst), &rh->head);
435 if (rn != NULL && ((rn->rn_flags & RNF_ROOT) == 0)) {
437 nh = nhop_select(rt->rt_nhop, flowid);
438 /* Ensure route & ifp is UP */
439 if (RT_LINK_IS_UP(nh->nh_ifp)) {
440 flags = (flags & NHR_REF) | NHR_COPY;
441 error = rt_exportinfo(rt, nh, info, flags);
453 * Releases all references acquired by rib_lookup_info() when
454 * called with NHR_REF flags.
457 rib_free_info(struct rt_addrinfo *info)
460 ifa_free(info->rti_ifa);
461 if_rele(info->rti_ifp);
465 * Delete Routes for a Network Interface
467 * Called for each routing entry via the rnh->rnh_walktree() call above
468 * to delete all route entries referencing a detaching network interface.
471 * rt pointer to rtentry
473 * arg argument passed to rnh->rnh_walktree() - detaching interface
477 * errno failed - reason indicated
480 rt_ifdelroute(const struct rtentry *rt, const struct nhop_object *nh, void *arg)
482 struct ifnet *ifp = arg;
484 if (nh->nh_ifp != ifp)
488 * Protect (sorta) against walktree recursion problems
491 if ((rt->rte_flags & RTF_UP) == 0)
498 rt_flushifroutes(struct ifnet *ifp)
501 rib_foreach_table_walk_del(AF_UNSPEC, rt_ifdelroute, ifp);
505 * Tries to extract interface from RTAX_IFP passed in rt_addrinfo.
506 * Interface can be specified ether as interface index (sdl_index) or
507 * the interface name (sdl_data).
509 * Returns found ifp or NULL
511 static struct ifnet *
512 info_get_ifp(struct rt_addrinfo *info)
514 const struct sockaddr_dl *sdl;
516 sdl = (const struct sockaddr_dl *)info->rti_info[RTAX_IFP];
517 if (sdl->sdl_family != AF_LINK)
520 if (sdl->sdl_index != 0)
521 return (ifnet_byindex(sdl->sdl_index));
522 if (sdl->sdl_nlen > 0) {
523 char if_name[IF_NAMESIZE];
524 if (sdl->sdl_nlen + offsetof(struct sockaddr_dl, sdl_data) > sdl->sdl_len)
526 if (sdl->sdl_nlen >= IF_NAMESIZE)
528 bzero(if_name, sizeof(if_name));
529 memcpy(if_name, sdl->sdl_data, sdl->sdl_nlen);
530 return (ifunit(if_name));
537 * Calculates proper ifa/ifp for the cases when gateway AF is different
540 * Returns 0 on success.
542 __noinline static int
543 rt_getifa_family(struct rt_addrinfo *info, uint32_t fibnum)
545 if (info->rti_ifp == NULL) {
546 struct ifaddr *ifa = NULL;
548 * No transmit interface specified. Guess it by checking gw sa.
550 const struct sockaddr *gw = info->rti_info[RTAX_GATEWAY];
551 ifa = ifa_ifwithroute(RTF_GATEWAY, gw, gw, fibnum);
553 return (ENETUNREACH);
554 info->rti_ifp = ifa->ifa_ifp;
557 /* Prefer address from outgoing interface */
558 info->rti_ifa = ifaof_ifpforaddr(info->rti_info[RTAX_DST], info->rti_ifp);
560 if (info->rti_ifa == NULL) {
561 /* Use first found IPv4 address */
562 bool loopback_ok = info->rti_ifp->if_flags & IFF_LOOPBACK;
563 info->rti_ifa = (struct ifaddr *)in_findlocal(fibnum, loopback_ok);
566 if (info->rti_ifa == NULL)
567 return (ENETUNREACH);
572 * Fills in rti_ifp and rti_ifa for the provided fib.
574 * Assume basic consistency checks are executed by callers:
575 * RTAX_DST exists, if RTF_GATEWAY is set, RTAX_GATEWAY exists as well.
578 rt_getifa_fib(struct rt_addrinfo *info, u_int fibnum)
580 const struct sockaddr *dst, *gateway, *ifaaddr;
583 dst = info->rti_info[RTAX_DST];
584 gateway = info->rti_info[RTAX_GATEWAY];
585 ifaaddr = info->rti_info[RTAX_IFA];
586 flags = info->rti_flags;
589 * ifp may be specified by sockaddr_dl
590 * when protocol address is ambiguous.
594 /* If we have interface specified by RTAX_IFP address, try to use it */
595 if ((info->rti_ifp == NULL) && (info->rti_info[RTAX_IFP] != NULL))
596 info->rti_ifp = info_get_ifp(info);
598 * If we have source address specified, try to find it
599 * TODO: avoid enumerating all ifas on all interfaces.
601 if (info->rti_ifa == NULL && ifaaddr != NULL)
602 info->rti_ifa = ifa_ifwithaddr(ifaaddr);
603 if ((info->rti_ifa == NULL) && ((info->rti_flags & RTF_GATEWAY) != 0) &&
604 (gateway->sa_family != dst->sa_family))
605 return (rt_getifa_family(info, fibnum));
606 if (info->rti_ifa == NULL) {
607 const struct sockaddr *sa;
610 * Most common use case for the userland-supplied routes.
612 * Choose sockaddr to select ifa.
613 * -- if ifp is set --
614 * Order of preference:
617 * Note: for interface routes link-level gateway address
618 * is specified to indicate the interface index without
619 * specifying RTF_GATEWAY. In this case, ignore gateway
620 * Note: gateway AF may be different from dst AF. In this case,
622 * 3) final destination.
623 * 4) if all of these fails, try to get at least link-level ifa.
625 * try to lookup gateway or dst in the routing table to get ifa
627 if (info->rti_info[RTAX_IFA] != NULL)
628 sa = info->rti_info[RTAX_IFA];
629 else if ((info->rti_flags & RTF_GATEWAY) != 0 &&
630 gateway->sa_family == dst->sa_family)
634 if (info->rti_ifp != NULL) {
635 info->rti_ifa = ifaof_ifpforaddr(sa, info->rti_ifp);
637 if (info->rti_ifa == NULL && gateway != NULL)
638 info->rti_ifa = ifaof_ifpforaddr(gateway, info->rti_ifp);
639 } else if (dst != NULL && gateway != NULL)
640 info->rti_ifa = ifa_ifwithroute(flags, dst, gateway,
643 info->rti_ifa = ifa_ifwithroute(flags, sa, sa,
646 if (info->rti_ifa != NULL) {
647 if (info->rti_ifp == NULL)
648 info->rti_ifp = info->rti_ifa->ifa_ifp;
655 rt_updatemtu(struct ifnet *ifp)
657 struct rib_head *rnh;
662 * Try to update rt_mtu for all routes using this interface
663 * Unfortunately the only way to do this is to traverse all
664 * routing tables in all fibs/domains.
666 for (i = 1; i <= AF_MAX; i++) {
667 mtu = if_getmtu_family(ifp, i);
668 for (j = 0; j < rt_numfibs; j++) {
669 rnh = rt_tables_get_rnh(j, i);
672 nhops_update_ifmtu(rnh, ifp, mtu);
678 int p_sockaddr(char *buf, int buflen, struct sockaddr *s);
679 int rt_print(char *buf, int buflen, struct rtentry *rt);
682 p_sockaddr(char *buf, int buflen, struct sockaddr *s)
686 switch (s->sa_family) {
688 paddr = &((struct sockaddr_in *)s)->sin_addr;
691 paddr = &((struct sockaddr_in6 *)s)->sin6_addr;
698 if (inet_ntop(s->sa_family, paddr, buf, buflen) == NULL)
701 return (strlen(buf));
705 rt_print(char *buf, int buflen, struct rtentry *rt)
707 struct sockaddr *addr, *mask;
713 i = p_sockaddr(buf, buflen, addr);
714 if (!(rt->rt_flags & RTF_HOST)) {
716 i += p_sockaddr(buf + i, buflen - i, mask);
719 if (rt->rt_flags & RTF_GATEWAY) {
721 i += p_sockaddr(buf + i, buflen - i, &rt->rt_nhop->gw_sa);
729 rt_maskedcopy(const struct sockaddr *src, struct sockaddr *dst,
730 const struct sockaddr *netmask)
732 const u_char *cp1 = (const u_char *)src;
733 u_char *cp2 = (u_char *)dst;
734 const u_char *cp3 = (const u_char *)netmask;
735 u_char *cplim = cp2 + *cp3;
736 u_char *cplim2 = cp2 + *cp1;
738 *cp2++ = *cp1++; *cp2++ = *cp1++; /* copies sa_len & sa_family */
743 *cp2++ = *cp1++ & *cp3++;
745 bzero((caddr_t)cp2, (unsigned)(cplim2 - cp2));
749 * Announce interface address arrival/withdraw
750 * Returns 0 on success.
753 rt_addrmsg(int cmd, struct ifaddr *ifa, int fibnum)
756 KASSERT(cmd == RTM_ADD || cmd == RTM_DELETE,
757 ("unexpected cmd %d", cmd));
758 KASSERT((fibnum >= 0 && fibnum < rt_numfibs),
759 ("%s: fib out of range 0 <=%d<%d", __func__, fibnum, rt_numfibs));
761 EVENTHANDLER_DIRECT_INVOKE(rt_addrmsg, ifa, cmd);
763 if (V_rt_add_addr_allfibs)
764 fibnum = RT_ALL_FIBS;
765 return (rtsock_addrmsg(cmd, ifa, fibnum));
769 * Announce kernel-originated route addition/removal to rtsock based on @rt data.
772 * @nh: nhop object to announce
773 * @fibnum: fib id or RT_ALL_FIBS
775 * Returns 0 on success.
778 rt_routemsg(int cmd, struct rtentry *rt, struct nhop_object *nh,
782 KASSERT(cmd == RTM_ADD || cmd == RTM_DELETE || cmd == RTM_CHANGE,
783 ("unexpected cmd %d", cmd));
785 KASSERT(fibnum == RT_ALL_FIBS || (fibnum >= 0 && fibnum < rt_numfibs),
786 ("%s: fib out of range 0 <=%d<%d", __func__, fibnum, rt_numfibs));
788 KASSERT(rt_key(rt) != NULL, (":%s: rt_key must be supplied", __func__));
790 return (rtsock_routemsg(cmd, rt, nh, fibnum));
794 * Announce kernel-originated route addition/removal to rtsock based on @rt data.
796 * @info: addrinfo structure with valid data.
797 * @fibnum: fib id or RT_ALL_FIBS
799 * Returns 0 on success.
802 rt_routemsg_info(int cmd, struct rt_addrinfo *info, int fibnum)
805 KASSERT(cmd == RTM_ADD || cmd == RTM_DELETE || cmd == RTM_CHANGE,
806 ("unexpected cmd %d", cmd));
808 KASSERT(fibnum == RT_ALL_FIBS || (fibnum >= 0 && fibnum < rt_numfibs),
809 ("%s: fib out of range 0 <=%d<%d", __func__, fibnum, rt_numfibs));
811 KASSERT(info->rti_info[RTAX_DST] != NULL, (":%s: RTAX_DST must be supplied", __func__));
813 return (rtsock_routemsg_info(cmd, info, fibnum));
817 rt_ifmsg(struct ifnet *ifp)
823 rt_ifmsg_14(struct ifnet *ifp, int if_flags_mask)
825 rtsock_callback_p->ifmsg_f(ifp, if_flags_mask);
826 netlink_callback_p->ifmsg_f(ifp, if_flags_mask);
829 /* Netlink-related callbacks needed to glue rtsock, netlink and linuxolator */
831 ignore_route_event(uint32_t fibnum, const struct rib_cmd_info *rc)
836 ignore_ifmsg_event(struct ifnet *ifp, int if_flags_mask)
840 static struct rtbridge ignore_cb = {
841 .route_f = ignore_route_event,
842 .ifmsg_f = ignore_ifmsg_event,
845 void *linux_netlink_p = NULL; /* Callback pointer for Linux translator functions */
846 struct rtbridge *rtsock_callback_p = &ignore_cb;
847 struct rtbridge *netlink_callback_p = &ignore_cb;