1/* $NetBSD: route.h,v 1.134 2023/06/16 02:48:07 rin Exp $ */
2
3/*
4 * Copyright (c) 1980, 1986, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 *
31 * @(#)route.h 8.5 (Berkeley) 2/8/95
32 */
33
34#ifndef _NET_ROUTE_H_
35#define _NET_ROUTE_H_
36
37#include <sys/queue.h>
38#include <sys/socket.h>
39#include <sys/types.h>
40#include <net/if.h>
41#ifdef _KERNEL
42#include <sys/rwlock.h>
43#include <sys/condvar.h>
44#include <sys/pserialize.h>
45#include <sys/percpu.h>
46#endif
47#include <sys/psref.h>
48
49#if !(defined(_KERNEL) || defined(_STANDALONE))
50#include <stdbool.h>
51#endif
52
53/*
54 * Kernel resident routing tables.
55 *
56 * The routing tables are initialized when interface addresses
57 * are set by making entries for all directly connected interfaces.
58 */
59
60/*
61 * A route consists of a destination address and a reference
62 * to a routing entry. These are often held by protocols
63 * in their control blocks, e.g. inpcb.
64 */
65struct route {
66 struct rtentry *_ro_rt;
67 struct sockaddr *ro_sa;
68 uint64_t ro_rtcache_generation;
69 struct psref ro_psref;
70 int ro_bound;
71};
72
73/*
74 * These numbers are used by reliable protocols for determining
75 * retransmission behavior and are included in the routing structure.
76 */
77struct rt_metrics {
78 uint64_t rmx_locks; /* Kernel must leave these values alone */
79 uint64_t rmx_mtu; /* MTU for this path */
80 uint64_t rmx_hopcount; /* max hops expected */
81 uint64_t rmx_recvpipe; /* inbound delay-bandwidth product */
82 uint64_t rmx_sendpipe; /* outbound delay-bandwidth product */
83 uint64_t rmx_ssthresh; /* outbound gateway buffer limit */
84 uint64_t rmx_rtt; /* estimated round trip time */
85 uint64_t rmx_rttvar; /* estimated rtt variance */
86 time_t rmx_expire; /* lifetime for route, e.g. redirect */
87 time_t rmx_pksent; /* packets sent using this route */
88};
89
90/*
91 * rmx_rtt and rmx_rttvar are stored as microseconds;
92 * RTTTOPRHZ(rtt) converts to a value suitable for use
93 * by a protocol slowtimo counter.
94 */
95#define RTM_RTTUNIT 1000000 /* units for rtt, rttvar, as units per sec */
96#define RTTTOPRHZ(r) ((r) / (RTM_RTTUNIT / PR_SLOWHZ))
97
98/*
99 * We distinguish between routes to hosts and routes to networks,
100 * preferring the former if available. For each route we infer
101 * the interface to use from the gateway address supplied when
102 * the route was entered. Routes that forward packets through
103 * gateways are marked so that the output routines know to address the
104 * gateway rather than the ultimate destination.
105 */
106#ifndef RNF_NORMAL
107#include <net/radix.h>
108#endif
109struct rtentry {
110 struct radix_node rt_nodes[2]; /* tree glue, and other values */
111#define rt_mask(r) ((const struct sockaddr *)((r)->rt_nodes->rn_mask))
112 struct sockaddr *rt_gateway; /* value */
113 int rt_flags; /* up/down?, host/net */
114 int rt_refcnt; /* # held references */
115 uint64_t rt_use; /* raw # packets forwarded */
116 struct ifnet *rt_ifp; /* the answer: interface to use */
117 struct ifaddr *rt_ifa; /* the answer: interface to use */
118 uint32_t rt_ifa_seqno;
119 void * rt_llinfo; /* pointer to link level info cache */
120 struct rt_metrics rt_rmx; /* metrics used by rx'ing protocols */
121 struct rtentry *rt_gwroute; /* implied entry for gatewayed routes */
122 LIST_HEAD(, rttimer) rt_timer; /* queue of timeouts for misc funcs */
123 struct rtentry *rt_parent; /* parent of cloned route */
124 struct sockaddr *_rt_key;
125 struct sockaddr *rt_tag; /* route tagging info */
126#ifdef _KERNEL
127 kcondvar_t rt_cv;
128 struct psref_target rt_psref;
129 SLIST_ENTRY(rtentry) rt_free; /* queue of deferred frees */
130#endif
131};
132
133static __inline const struct sockaddr *
134rt_getkey(const struct rtentry *rt)
135{
136 return rt->_rt_key;
137}
138
139/*
140 * Following structure necessary for 4.3 compatibility;
141 * We should eventually move it to a compat file.
142 */
143struct ortentry {
144 uint32_t rt_hash; /* to speed lookups */
145 struct sockaddr rt_dst; /* key */
146 struct sockaddr rt_gateway; /* value */
147 int16_t rt_flags; /* up/down?, host/net */
148 int16_t rt_refcnt; /* # held references */
149 uint32_t rt_use; /* raw # packets forwarded */
150 struct ifnet *rt_ifp; /* the answer: interface to use */
151};
152
153#define RTF_UP 0x1 /* route usable */
154#define RTF_GATEWAY 0x2 /* destination is a gateway */
155#define RTF_HOST 0x4 /* host entry (net otherwise) */
156#define RTF_REJECT 0x8 /* host or net unreachable */
157#define RTF_DYNAMIC 0x10 /* created dynamically (by redirect) */
158#define RTF_MODIFIED 0x20 /* modified dynamically (by redirect) */
159#define RTF_DONE 0x40 /* message confirmed */
160#define RTF_MASK 0x80 /* subnet mask present */
161// #define RTF_CLONING 0x100 /* generate new routes on use */
162#define RTF_CONNECTED 0x100 /* hosts on this route are neighbours */
163// #define RTF_XRESOLVE 0x200 /* external daemon resolves name */
164// #define RTF_LLINFO 0x400 /* generated by ARP or NDP */
165#define RTF_LLDATA 0x400 /* used by apps to add/del L2 entries */
166#define RTF_STATIC 0x800 /* manually added */
167#define RTF_BLACKHOLE 0x1000 /* just discard pkts (during updates) */
168// #define RTF_CLONED 0x2000 /* this is a cloned route */
169#define RTF_PROTO2 0x4000 /* protocol specific routing flag */
170#define RTF_PROTO1 0x8000 /* protocol specific routing flag */
171#define RTF_SRC 0x10000 /* route has fixed source address */
172#define RTF_ANNOUNCE 0x20000 /* announce new ARP or NDP entry */
173#define RTF_LOCAL 0x40000 /* route represents a local address */
174#define RTF_BROADCAST 0x80000 /* route represents a bcast address */
175#define RTF_UPDATING 0x100000 /* route is updating */
176/*
177 * The flag is nevert set to rt_flags. It just tells rtrequest1 to set a passed
178 * ifa to rt_ifa (via rti_ifa) and not replace rt_ifa in ifa_rtrequest.
179 */
180#define RTF_DONTCHANGEIFA 0x200000 /* suppress rt_ifa replacement */
181
182/*
183 * 0x400 is exposed to userland just for backward compatibility. For that
184 * purpose, it should be shown as LLINFO.
185 */
186#define RTFBITS "\020\1UP\2GATEWAY\3HOST\4REJECT\5DYNAMIC\6MODIFIED\7DONE" \
187 "\010MASK_PRESENT\011CONNECTED\012XRESOLVE\013LLINFO\014STATIC" \
188 "\015BLACKHOLE\016CLONED\017PROTO2\020PROTO1\021SRC\022ANNOUNCE" \
189 "\023LOCAL\024BROADCAST\025UPDATING"
190
191
192/*
193 * Routing statistics.
194 */
195struct rtstat {
196 uint64_t rts_badredirect; /* bogus redirect calls */
197 uint64_t rts_dynamic; /* routes created by redirects */
198 uint64_t rts_newgateway; /* routes modified by redirects */
199 uint64_t rts_unreach; /* lookups which failed */
200 uint64_t rts_wildcard; /* lookups satisfied by a wildcard */
201};
202
203/*
204 * Structures for routing messages. By forcing the first member to be aligned
205 * at a 64-bit boundary, we also force the size to be a multiple of 64-bits.
206 */
207
208#if !defined(_KERNEL) || !defined(COMPAT_RTSOCK)
209/*
210 * If we aren't being compiled for backwards compatibility, enforce 64-bit
211 * alignment so any routing message is the same regardless if the kernel
212 * is an ILP32 or LP64 kernel.
213 */
214#define __align64 __aligned(sizeof(uint64_t))
215#else
216#define __align64
217#endif
218
219struct rt_msghdr {
220 u_short rtm_msglen __align64;
221 /* to skip over non-understood messages */
222 u_char rtm_version; /* future binary compatibility */
223 u_char rtm_type; /* message type */
224 u_short rtm_index; /* index for associated ifp */
225 int rtm_flags; /* flags, incl. kern & message, e.g. DONE */
226 int rtm_addrs; /* bitmask identifying sockaddrs in msg */
227 pid_t rtm_pid; /* identify sender */
228 int rtm_seq; /* for sender to identify action */
229 int rtm_errno; /* why failed */
230 int rtm_use; /* from rtentry */
231 int rtm_inits; /* which metrics we are initializing */
232 struct rt_metrics rtm_rmx __align64;
233 /* metrics themselves */
234};
235
236#undef __align64
237
238#define RTM_VERSION 4 /* Up the ante and ignore older versions */
239
240#define RTM_ADD 0x1 /* Add Route */
241#define RTM_DELETE 0x2 /* Delete Route */
242#define RTM_CHANGE 0x3 /* Change Metrics or flags */
243#define RTM_GET 0x4 /* Report Metrics */
244#define RTM_LOSING 0x5 /* Kernel Suspects Partitioning */
245#define RTM_REDIRECT 0x6 /* Told to use different route */
246#define RTM_MISS 0x7 /* Lookup failed on this address */
247#define RTM_LOCK 0x8 /* fix specified metrics */
248#define RTM_OLDADD 0x9 /* caused by SIOCADDRT */
249#define RTM_OLDDEL 0xa /* caused by SIOCDELRT */
250// #define RTM_RESOLVE 0xb /* req to resolve dst to LL addr */
251#define RTM_ONEWADDR 0xc /* Old (pre-8.0) RTM_NEWADDR message */
252#define RTM_ODELADDR 0xd /* Old (pre-8.0) RTM_DELADDR message */
253#define RTM_OOIFINFO 0xe /* Old (pre-1.5) RTM_IFINFO message */
254#define RTM_OIFINFO 0xf /* Old (pre-64bit time) RTM_IFINFO message */
255#define RTM_IFANNOUNCE 0x10 /* iface arrival/departure */
256#define RTM_IEEE80211 0x11 /* IEEE80211 wireless event */
257#define RTM_SETGATE 0x12 /* set prototype gateway for clones
258 * (see example in arp_rtrequest).
259 */
260#define RTM_LLINFO_UPD 0x13 /* indication to ARP/NDP/etc. that link-layer
261 * address has changed
262 */
263#define RTM_IFINFO 0x14 /* iface/link going up/down etc. */
264#define RTM_OCHGADDR 0x15 /* Old (pre-8.0) RTM_CHGADDR message */
265#define RTM_NEWADDR 0x16 /* address being added to iface */
266#define RTM_DELADDR 0x17 /* address being removed from iface */
267#define RTM_CHGADDR 0x18 /* address properties changed */
268
269#ifdef RTM_NAMES
270static const char *rtm_names[] = {
271 "*none*", "add", "delete", "change", "get",
272 "losing", "redirect", "miss", "lock", "oldadd",
273 "olddel", "*resolve*", "onewaddr", "odeladdr", "ooifinfo",
274 "oifinfo", "ifannounce", "ieee80211", "setgate", "llinfo_upd",
275 "ifinfo", "ochgaddr", "newaddr", "deladdr", "chgaddr",
276};
277#endif
278
279/*
280 * setsockopt defines used for the filtering.
281 */
282#define RO_MSGFILTER 1 /* array of which rtm_type to send to client */
283#define RO_MISSFILTER 2 /* array of sockaddrs to match miss dst */
284
285#define RO_FILTSA_MAX 30 /* maximum number of sockaddrs per filter */
286
287#define RTV_MTU 0x1 /* init or lock _mtu */
288#define RTV_HOPCOUNT 0x2 /* init or lock _hopcount */
289#define RTV_EXPIRE 0x4 /* init or lock _expire */
290#define RTV_RPIPE 0x8 /* init or lock _recvpipe */
291#define RTV_SPIPE 0x10 /* init or lock _sendpipe */
292#define RTV_SSTHRESH 0x20 /* init or lock _ssthresh */
293#define RTV_RTT 0x40 /* init or lock _rtt */
294#define RTV_RTTVAR 0x80 /* init or lock _rttvar */
295
296#define RTVBITS "\020\1MTU\2HOPCOUNT\3EXPIRE\4RECVPIPE\5SENDPIPE" \
297 "\6SSTHRESH\7RTT\010RTTVAR"
298
299/*
300 * Bitmask values for rtm_addr.
301 */
302#define RTA_DST 0x1 /* destination sockaddr present */
303#define RTA_GATEWAY 0x2 /* gateway sockaddr present */
304#define RTA_NETMASK 0x4 /* netmask sockaddr present */
305#define RTA_GENMASK 0x8 /* cloning mask sockaddr present */
306#define RTA_IFP 0x10 /* interface name sockaddr present */
307#define RTA_IFA 0x20 /* interface addr sockaddr present */
308#define RTA_AUTHOR 0x40 /* sockaddr for author of redirect */
309#define RTA_BRD 0x80 /* for NEWADDR, broadcast or p-p dest addr */
310#define RTA_TAG 0x100 /* route tag */
311
312#define RTABITS "\020\1DST\2GATEWAY\3NETMASK\4GENMASK\5IFP\6IFA\7AUTHOR" \
313 "\010BRD\011TAG"
314
315/*
316 * Index offsets for sockaddr array for alternate internal encoding.
317 */
318#define RTAX_DST 0 /* destination sockaddr present */
319#define RTAX_GATEWAY 1 /* gateway sockaddr present */
320#define RTAX_NETMASK 2 /* netmask sockaddr present */
321#define RTAX_GENMASK 3 /* cloning mask sockaddr present */
322#define RTAX_IFP 4 /* interface name sockaddr present */
323#define RTAX_IFA 5 /* interface addr sockaddr present */
324#define RTAX_AUTHOR 6 /* sockaddr for author of redirect */
325#define RTAX_BRD 7 /* for NEWADDR, broadcast or p-p dest addr */
326#define RTAX_TAG 8 /* route tag */
327#define RTAX_MAX 9 /* size of array to allocate */
328
329#define RT_ROUNDUP2(a, n) ((a) > 0 ? (1 + (((a) - 1U) | ((n) - 1))) : (n))
330#define RT_ROUNDUP(a) RT_ROUNDUP2((a), sizeof(uint64_t))
331#define RT_ADVANCE(x, n) (x += RT_ROUNDUP((n)->sa_len))
332
333struct rt_addrinfo {
334 int rti_addrs;
335 const struct sockaddr *rti_info[RTAX_MAX];
336 int rti_flags;
337 struct ifaddr *rti_ifa;
338 struct ifnet *rti_ifp;
339};
340
341struct route_cb {
342 int ip_count;
343 int ip6_count;
344 int unused1;
345 int mpls_count;
346 int any_count;
347};
348
349/*
350 * This structure, and the prototypes for the rt_timer_{init,remove_all,
351 * add,timer} functions all used with the kind permission of BSDI.
352 * These allow functions to be called for routes at specific times.
353 */
354
355struct rttimer {
356 TAILQ_ENTRY(rttimer) rtt_next; /* entry on timer queue */
357 LIST_ENTRY(rttimer) rtt_link; /* multiple timers per rtentry */
358 struct rttimer_queue *rtt_queue; /* back pointer to queue */
359 struct rtentry *rtt_rt; /* Back pointer to the route */
360 void (*rtt_func)(struct rtentry *, struct rttimer *);
361 time_t rtt_time; /* When this timer was registered */
362};
363
364struct rttimer_queue {
365 long rtq_timeout;
366 unsigned long rtq_count;
367 TAILQ_HEAD(, rttimer) rtq_head;
368 LIST_ENTRY(rttimer_queue) rtq_link;
369};
370
371
372struct rtbl;
373typedef struct rtbl rtbl_t;
374
375#ifdef _KERNEL
376
377struct rtbl {
378 struct radix_node_head t_rnh;
379};
380
381struct rt_walkarg {
382 int w_op;
383 int w_arg;
384 int w_given;
385 int w_needed;
386 void * w_where;
387 int w_tmemsize;
388 int w_tmemneeded;
389 void * w_tmem;
390};
391
392#if 0
393#define RT_DPRINTF(__fmt, ...) do { } while (/*CONSTCOND*/0)
394#else
395#define RT_DPRINTF(__fmt, ...) /* do nothing */
396#endif
397
398struct rtwalk {
399 int (*rw_f)(struct rtentry *, void *);
400 void *rw_v;
401};
402
403/*
404 * Global data specific to the routing socket.
405 */
406struct route_info {
407 struct sockaddr ri_dst;
408 struct sockaddr ri_src;
409 struct route_cb ri_cb;
410 int ri_maxqlen;
411 struct ifqueue ri_intrq;
412 void *ri_sih;
413};
414
415extern struct route_info route_info;
416extern struct rtstat rtstat;
417
418struct socket;
419
420void rt_init(void);
421
422int rt_timer_add(struct rtentry *,
423 void(*)(struct rtentry *, struct rttimer *),
424 struct rttimer_queue *);
425unsigned long
426 rt_timer_count(struct rttimer_queue *);
427void rt_timer_queue_change(struct rttimer_queue *, long);
428struct rttimer_queue *
429 rt_timer_queue_create(u_int);
430void rt_timer_queue_destroy(struct rttimer_queue *);
431
432void rt_free(struct rtentry *);
433void rt_unref(struct rtentry *);
434
435int rt_update(struct rtentry *, struct rt_addrinfo *, void *);
436int rt_update_prepare(struct rtentry *);
437void rt_update_finish(struct rtentry *);
438
439void rt_newmsg(const int, const struct rtentry *);
440void rt_newmsg_dynamic(const int, const struct rtentry *);
441struct rtentry *
442 rtalloc1(const struct sockaddr *, int);
443int rtinit(struct ifaddr *, int, int);
444void rtredirect(const struct sockaddr *, const struct sockaddr *,
445 const struct sockaddr *, int, const struct sockaddr *,
446 struct rtentry **);
447int rtrequest(int, const struct sockaddr *,
448 const struct sockaddr *, const struct sockaddr *, int,
449 struct rtentry **);
450int rtrequest1(int, struct rt_addrinfo *, struct rtentry **);
451
452int rt_ifa_addlocal(struct ifaddr *);
453int rt_ifa_remlocal(struct ifaddr *, struct ifaddr *);
454struct ifaddr *
455 rt_get_ifa(struct rtentry *);
456void rt_replace_ifa(struct rtentry *, struct ifaddr *);
457int rt_setgate(struct rtentry *, const struct sockaddr *);
458
459const struct sockaddr *
460 rt_settag(struct rtentry *, const struct sockaddr *);
461struct sockaddr *
462 rt_gettag(const struct rtentry *);
463
464int rt_check_reject_route(const struct rtentry *, const struct ifnet *);
465void rt_delete_matched_entries(sa_family_t,
466 int (*)(struct rtentry *, void *), void *, bool);
467void rt_replace_ifa_matched_entries(sa_family_t,
468 int (*)(struct rtentry *, void *), void *, struct ifaddr *);
469int rt_walktree(sa_family_t, int (*)(struct rtentry *, void *), void *);
470
471static __inline void
472rt_assert_referenced(const struct rtentry *rt)
473{
474
475 KASSERT(rt->rt_refcnt > 0);
476}
477
478void rtcache_copy(struct route *, struct route *);
479void rtcache_free(struct route *);
480struct rtentry *
481 rtcache_init(struct route *);
482struct rtentry *
483 rtcache_init_noclone(struct route *);
484struct rtentry *
485 rtcache_lookup2(struct route *, const struct sockaddr *, int,
486 int *);
487int rtcache_setdst(struct route *, const struct sockaddr *);
488struct rtentry *
489 rtcache_update(struct route *, int);
490
491static __inline void
492rtcache_invariants(const struct route *ro)
493{
494
495 KASSERT(ro->ro_sa != NULL || ro->_ro_rt == NULL);
496}
497
498static __inline struct rtentry *
499rtcache_lookup1(struct route *ro, const struct sockaddr *dst, int clone)
500{
501 int hit;
502
503 return rtcache_lookup2(ro, dst, clone, &hit);
504}
505
506static __inline struct rtentry *
507rtcache_lookup(struct route *ro, const struct sockaddr *dst)
508{
509 return rtcache_lookup1(ro, dst, 1);
510}
511
512static __inline const struct sockaddr *
513rtcache_getdst(const struct route *ro)
514{
515
516 rtcache_invariants(ro);
517 return ro->ro_sa;
518}
519
520struct rtentry *
521 rtcache_validate(struct route *);
522
523void rtcache_unref(struct rtentry *, struct route *);
524
525percpu_t *
526 rtcache_percpu_alloc(void);
527
528static __inline struct route *
529rtcache_percpu_getref(percpu_t *pc)
530{
531
532 return *(struct route **)percpu_getref(pc);
533}
534
535static __inline void
536rtcache_percpu_putref(percpu_t *pc)
537{
538
539 percpu_putref(pc);
540}
541
542
543/* rtsock */
544void rt_ieee80211msg(struct ifnet *, int, void *, size_t);
545void rt_ifannouncemsg(struct ifnet *, int);
546void rt_ifmsg(struct ifnet *);
547void rt_missmsg(int, const struct rt_addrinfo *, int, int);
548struct mbuf *
549 rt_msg1(int, struct rt_addrinfo *, void *, int);
550int rt_msg3(int, struct rt_addrinfo *, void *, struct rt_walkarg *, int *);
551void rt_addrmsg(int, struct ifaddr *);
552void rt_addrmsg_src(int, struct ifaddr *, const struct sockaddr *);
553void rt_addrmsg_rt(int, struct ifaddr *, int, struct rtentry *);
554void route_enqueue(struct mbuf *, int);
555
556struct llentry;
557void rt_clonedmsg(int, const struct sockaddr *, const struct sockaddr *,
558 const uint8_t *, const struct ifnet *);
559
560void rt_setmetrics(void *, struct rtentry *);
561
562/* rtbl */
563int rt_addaddr(rtbl_t *, struct rtentry *, const struct sockaddr *);
564void rt_assert_inactive(const struct rtentry *);
565struct rtentry *
566 rt_deladdr(rtbl_t *, const struct sockaddr *,
567 const struct sockaddr *);
568rtbl_t *rt_gettable(sa_family_t);
569int rt_inithead(rtbl_t **, int);
570struct rtentry *
571 rt_lookup(rtbl_t *, const struct sockaddr *,
572 const struct sockaddr *);
573struct rtentry *
574 rt_matchaddr(rtbl_t *, const struct sockaddr *);
575int rt_refines(const struct sockaddr *, const struct sockaddr *);
576int rtbl_walktree(sa_family_t, int (*)(struct rtentry *, void *), void *);
577struct rtentry *
578 rtbl_search_matched_entry(sa_family_t,
579 int (*)(struct rtentry *, void *), void *);
580void rtbl_init(void);
581
582void sysctl_net_route_setup(struct sysctllog **, int, const char *);
583
584#endif /* _KERNEL */
585
586#endif /* !_NET_ROUTE_H_ */