FreeBSD/Linux Kernel Cross Reference
sys/net/route.h
1 /*-
2 * Copyright (c) 1980, 1986, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
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.
16 *
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
27 * SUCH DAMAGE.
28 *
29 * @(#)route.h 8.4 (Berkeley) 1/9/95
30 * $FreeBSD: releng/8.3/sys/net/route.h 231225 2012-02-08 19:31:32Z bz $
31 */
32
33 #ifndef _NET_ROUTE_H_
34 #define _NET_ROUTE_H_
35
36 /*
37 * Kernel resident routing tables.
38 *
39 * The routing tables are initialized when interface addresses
40 * are set by making entries for all directly connected interfaces.
41 */
42
43 /*
44 * A route consists of a destination address, a reference
45 * to a routing entry, and a reference to an llentry.
46 * These are often held by protocols in their control
47 * blocks, e.g. inpcb.
48 */
49 struct route {
50 struct rtentry *ro_rt;
51 struct llentry *ro_lle;
52 struct sockaddr ro_dst;
53 };
54
55 /*
56 * These numbers are used by reliable protocols for determining
57 * retransmission behavior and are included in the routing structure.
58 */
59 struct rt_metrics_lite {
60 u_long rmx_mtu; /* MTU for this path */
61 u_long rmx_expire; /* lifetime for route, e.g. redirect */
62 u_long rmx_pksent; /* packets sent using this route */
63 u_long rmx_weight; /* absolute weight */
64 };
65
66 struct rt_metrics {
67 u_long rmx_locks; /* Kernel must leave these values alone */
68 u_long rmx_mtu; /* MTU for this path */
69 u_long rmx_hopcount; /* max hops expected */
70 u_long rmx_expire; /* lifetime for route, e.g. redirect */
71 u_long rmx_recvpipe; /* inbound delay-bandwidth product */
72 u_long rmx_sendpipe; /* outbound delay-bandwidth product */
73 u_long rmx_ssthresh; /* outbound gateway buffer limit */
74 u_long rmx_rtt; /* estimated round trip time */
75 u_long rmx_rttvar; /* estimated rtt variance */
76 u_long rmx_pksent; /* packets sent using this route */
77 u_long rmx_weight; /* route weight */
78 u_long rmx_filler[3]; /* will be used for T/TCP later */
79 };
80
81 /*
82 * rmx_rtt and rmx_rttvar are stored as microseconds;
83 * RTTTOPRHZ(rtt) converts to a value suitable for use
84 * by a protocol slowtimo counter.
85 */
86 #define RTM_RTTUNIT 1000000 /* units for rtt, rttvar, as units per sec */
87 #define RTTTOPRHZ(r) ((r) / (RTM_RTTUNIT / PR_SLOWHZ))
88
89 /* MRT compile-time constants */
90 #ifdef _KERNEL
91 #ifndef ROUTETABLES
92 #define RT_NUMFIBS 1
93 #define RT_MAXFIBS 1
94 #else
95 /* while we use 4 bits in the mbuf flags, we are limited to 16 */
96 #define RT_MAXFIBS 16
97 #if ROUTETABLES > RT_MAXFIBS
98 #define RT_NUMFIBS RT_MAXFIBS
99 #error "ROUTETABLES defined too big"
100 #else
101 #if ROUTETABLES == 0
102 #define RT_NUMFIBS 1
103 #else
104 #define RT_NUMFIBS ROUTETABLES
105 #endif
106 #endif
107 #endif
108 #endif
109
110 extern u_int rt_numfibs; /* number fo usable routing tables */
111 /*
112 * XXX kernel function pointer `rt_output' is visible to applications.
113 */
114 struct mbuf;
115
116 /*
117 * We distinguish between routes to hosts and routes to networks,
118 * preferring the former if available. For each route we infer
119 * the interface to use from the gateway address supplied when
120 * the route was entered. Routes that forward packets through
121 * gateways are marked so that the output routines know to address the
122 * gateway rather than the ultimate destination.
123 */
124 #ifndef RNF_NORMAL
125 #include <net/radix.h>
126 #ifdef RADIX_MPATH
127 #include <net/radix_mpath.h>
128 #endif
129 #endif
130 struct rtentry {
131 struct radix_node rt_nodes[2]; /* tree glue, and other values */
132 /*
133 * XXX struct rtentry must begin with a struct radix_node (or two!)
134 * because the code does some casts of a 'struct radix_node *'
135 * to a 'struct rtentry *'
136 */
137 #define rt_key(r) (*((struct sockaddr **)(&(r)->rt_nodes->rn_key)))
138 #define rt_mask(r) (*((struct sockaddr **)(&(r)->rt_nodes->rn_mask)))
139 struct sockaddr *rt_gateway; /* value */
140 int rt_flags; /* up/down?, host/net */
141 int rt_refcnt; /* # held references */
142 struct ifnet *rt_ifp; /* the answer: interface to use */
143 struct ifaddr *rt_ifa; /* the answer: interface address to use */
144 struct rt_metrics_lite rt_rmx; /* metrics used by rx'ing protocols */
145 u_int rt_fibnum; /* which FIB */
146 #ifdef _KERNEL
147 /* XXX ugly, user apps use this definition but don't have a mtx def */
148 struct mtx rt_mtx; /* mutex for routing entry */
149 #endif
150 };
151
152 /*
153 * Following structure necessary for 4.3 compatibility;
154 * We should eventually move it to a compat file.
155 */
156 struct ortentry {
157 u_long rt_hash; /* to speed lookups */
158 struct sockaddr rt_dst; /* key */
159 struct sockaddr rt_gateway; /* value */
160 short rt_flags; /* up/down?, host/net */
161 short rt_refcnt; /* # held references */
162 u_long rt_use; /* raw # packets forwarded */
163 struct ifnet *rt_ifp; /* the answer: interface to use */
164 };
165
166 #define rt_use rt_rmx.rmx_pksent
167
168 #define RTF_UP 0x1 /* route usable */
169 #define RTF_GATEWAY 0x2 /* destination is a gateway */
170 #define RTF_HOST 0x4 /* host entry (net otherwise) */
171 #define RTF_REJECT 0x8 /* host or net unreachable */
172 #define RTF_DYNAMIC 0x10 /* created dynamically (by redirect) */
173 #define RTF_MODIFIED 0x20 /* modified dynamically (by redirect) */
174 #define RTF_DONE 0x40 /* message confirmed */
175 /* 0x80 unused, was RTF_DELCLONE */
176 /* 0x100 unused, was RTF_CLONING */
177 #define RTF_XRESOLVE 0x200 /* external daemon resolves name */
178 #define RTF_LLINFO 0x400 /* DEPRECATED - exists ONLY for backward
179 compatibility */
180 #define RTF_LLDATA 0x400 /* used by apps to add/del L2 entries */
181 #define RTF_STATIC 0x800 /* manually added */
182 #define RTF_BLACKHOLE 0x1000 /* just discard pkts (during updates) */
183 #define RTF_PROTO2 0x4000 /* protocol specific routing flag */
184 #define RTF_PROTO1 0x8000 /* protocol specific routing flag */
185
186 /* XXX: temporary to stay API/ABI compatible with userland */
187 #ifndef _KERNEL
188 #define RTF_PRCLONING 0x10000 /* unused, for compatibility */
189 #endif
190
191 /* 0x20000 unused, was RTF_WASCLONED */
192 #define RTF_PROTO3 0x40000 /* protocol specific routing flag */
193 /* 0x80000 unused */
194 #define RTF_PINNED 0x100000 /* future use */
195 #define RTF_LOCAL 0x200000 /* route represents a local address */
196 #define RTF_BROADCAST 0x400000 /* route represents a bcast address */
197 #define RTF_MULTICAST 0x800000 /* route represents a mcast address */
198 /* 0x8000000 and up unassigned */
199 #define RTF_STICKY 0x10000000 /* always route dst->src */
200
201 #define RTF_RNH_LOCKED 0x40000000 /* radix node head is locked */
202
203 /* Mask of RTF flags that are allowed to be modified by RTM_CHANGE. */
204 #define RTF_FMASK \
205 (RTF_PROTO1 | RTF_PROTO2 | RTF_PROTO3 | RTF_BLACKHOLE | \
206 RTF_REJECT | RTF_STATIC | RTF_STICKY)
207
208 /*
209 * Routing statistics.
210 */
211 struct rtstat {
212 short rts_badredirect; /* bogus redirect calls */
213 short rts_dynamic; /* routes created by redirects */
214 short rts_newgateway; /* routes modified by redirects */
215 short rts_unreach; /* lookups which failed */
216 short rts_wildcard; /* lookups satisfied by a wildcard */
217 };
218 /*
219 * Structures for routing messages.
220 */
221 struct rt_msghdr {
222 u_short rtm_msglen; /* to skip over non-understood messages */
223 u_char rtm_version; /* future binary compatibility */
224 u_char rtm_type; /* message type */
225 u_short rtm_index; /* index for associated ifp */
226 int rtm_flags; /* flags, incl. kern & message, e.g. DONE */
227 int rtm_addrs; /* bitmask identifying sockaddrs in msg */
228 pid_t rtm_pid; /* identify sender */
229 int rtm_seq; /* for sender to identify action */
230 int rtm_errno; /* why failed */
231 int rtm_fmask; /* bitmask used in RTM_CHANGE message */
232 u_long rtm_inits; /* which metrics we are initializing */
233 struct rt_metrics rtm_rmx; /* metrics themselves */
234 };
235
236 #define RTM_VERSION 5 /* Up the ante and ignore older versions */
237
238 /*
239 * Message types.
240 */
241 #define RTM_ADD 0x1 /* Add Route */
242 #define RTM_DELETE 0x2 /* Delete Route */
243 #define RTM_CHANGE 0x3 /* Change Metrics or flags */
244 #define RTM_GET 0x4 /* Report Metrics */
245 #define RTM_LOSING 0x5 /* Kernel Suspects Partitioning */
246 #define RTM_REDIRECT 0x6 /* Told to use different route */
247 #define RTM_MISS 0x7 /* Lookup failed on this address */
248 #define RTM_LOCK 0x8 /* fix specified metrics */
249 #define RTM_OLDADD 0x9 /* caused by SIOCADDRT */
250 #define RTM_OLDDEL 0xa /* caused by SIOCDELRT */
251 #define RTM_RESOLVE 0xb /* req to resolve dst to LL addr */
252 #define RTM_NEWADDR 0xc /* address being added to iface */
253 #define RTM_DELADDR 0xd /* address being removed from iface */
254 #define RTM_IFINFO 0xe /* iface going up/down etc. */
255 #define RTM_NEWMADDR 0xf /* mcast group membership being added to if */
256 #define RTM_DELMADDR 0x10 /* mcast group membership being deleted */
257 #define RTM_IFANNOUNCE 0x11 /* iface arrival/departure */
258 #define RTM_IEEE80211 0x12 /* IEEE80211 wireless event */
259
260 /*
261 * Bitmask values for rtm_inits and rmx_locks.
262 */
263 #define RTV_MTU 0x1 /* init or lock _mtu */
264 #define RTV_HOPCOUNT 0x2 /* init or lock _hopcount */
265 #define RTV_EXPIRE 0x4 /* init or lock _expire */
266 #define RTV_RPIPE 0x8 /* init or lock _recvpipe */
267 #define RTV_SPIPE 0x10 /* init or lock _sendpipe */
268 #define RTV_SSTHRESH 0x20 /* init or lock _ssthresh */
269 #define RTV_RTT 0x40 /* init or lock _rtt */
270 #define RTV_RTTVAR 0x80 /* init or lock _rttvar */
271 #define RTV_WEIGHT 0x100 /* init or lock _weight */
272
273 /*
274 * Bitmask values for rtm_addrs.
275 */
276 #define RTA_DST 0x1 /* destination sockaddr present */
277 #define RTA_GATEWAY 0x2 /* gateway sockaddr present */
278 #define RTA_NETMASK 0x4 /* netmask sockaddr present */
279 #define RTA_GENMASK 0x8 /* cloning mask sockaddr present */
280 #define RTA_IFP 0x10 /* interface name sockaddr present */
281 #define RTA_IFA 0x20 /* interface addr sockaddr present */
282 #define RTA_AUTHOR 0x40 /* sockaddr for author of redirect */
283 #define RTA_BRD 0x80 /* for NEWADDR, broadcast or p-p dest addr */
284
285 /*
286 * Index offsets for sockaddr array for alternate internal encoding.
287 */
288 #define RTAX_DST 0 /* destination sockaddr present */
289 #define RTAX_GATEWAY 1 /* gateway sockaddr present */
290 #define RTAX_NETMASK 2 /* netmask sockaddr present */
291 #define RTAX_GENMASK 3 /* cloning mask sockaddr present */
292 #define RTAX_IFP 4 /* interface name sockaddr present */
293 #define RTAX_IFA 5 /* interface addr sockaddr present */
294 #define RTAX_AUTHOR 6 /* sockaddr for author of redirect */
295 #define RTAX_BRD 7 /* for NEWADDR, broadcast or p-p dest addr */
296 #define RTAX_MAX 8 /* size of array to allocate */
297
298 struct rt_addrinfo {
299 int rti_addrs;
300 struct sockaddr *rti_info[RTAX_MAX];
301 int rti_flags;
302 struct ifaddr *rti_ifa;
303 struct ifnet *rti_ifp;
304 };
305
306 /*
307 * This macro returns the size of a struct sockaddr when passed
308 * through a routing socket. Basically we round up sa_len to
309 * a multiple of sizeof(long), with a minimum of sizeof(long).
310 * The check for a NULL pointer is just a convenience, probably never used.
311 * The case sa_len == 0 should only apply to empty structures.
312 */
313 #define SA_SIZE(sa) \
314 ( (!(sa) || ((struct sockaddr *)(sa))->sa_len == 0) ? \
315 sizeof(long) : \
316 1 + ( (((struct sockaddr *)(sa))->sa_len - 1) | (sizeof(long) - 1) ) )
317
318 #ifdef _KERNEL
319
320 #define RT_LINK_IS_UP(ifp) (!((ifp)->if_capabilities & IFCAP_LINKSTATE) \
321 || (ifp)->if_link_state == LINK_STATE_UP)
322
323 #define RT_LOCK_INIT(_rt) \
324 mtx_init(&(_rt)->rt_mtx, "rtentry", NULL, MTX_DEF | MTX_DUPOK)
325 #define RT_LOCK(_rt) mtx_lock(&(_rt)->rt_mtx)
326 #define RT_UNLOCK(_rt) mtx_unlock(&(_rt)->rt_mtx)
327 #define RT_LOCK_DESTROY(_rt) mtx_destroy(&(_rt)->rt_mtx)
328 #define RT_LOCK_ASSERT(_rt) mtx_assert(&(_rt)->rt_mtx, MA_OWNED)
329
330 #define RT_ADDREF(_rt) do { \
331 RT_LOCK_ASSERT(_rt); \
332 KASSERT((_rt)->rt_refcnt >= 0, \
333 ("negative refcnt %d", (_rt)->rt_refcnt)); \
334 (_rt)->rt_refcnt++; \
335 } while (0)
336
337 #define RT_REMREF(_rt) do { \
338 RT_LOCK_ASSERT(_rt); \
339 KASSERT((_rt)->rt_refcnt > 0, \
340 ("bogus refcnt %d", (_rt)->rt_refcnt)); \
341 (_rt)->rt_refcnt--; \
342 } while (0)
343
344 #define RTFREE_LOCKED(_rt) do { \
345 if ((_rt)->rt_refcnt <= 1) \
346 rtfree(_rt); \
347 else { \
348 RT_REMREF(_rt); \
349 RT_UNLOCK(_rt); \
350 } \
351 /* guard against invalid refs */ \
352 _rt = 0; \
353 } while (0)
354
355 #define RTFREE(_rt) do { \
356 RT_LOCK(_rt); \
357 RTFREE_LOCKED(_rt); \
358 } while (0)
359
360 struct radix_node_head *rt_tables_get_rnh(int, int);
361
362 struct ifmultiaddr;
363
364 void rt_ieee80211msg(struct ifnet *, int, void *, size_t);
365 void rt_ifannouncemsg(struct ifnet *, int);
366 void rt_ifmsg(struct ifnet *);
367 void rt_missmsg(int, struct rt_addrinfo *, int, int);
368 void rt_missmsg_fib(int, struct rt_addrinfo *, int, int, int);
369 void rt_newaddrmsg(int, struct ifaddr *, int, struct rtentry *);
370 void rt_newaddrmsg_fib(int, struct ifaddr *, int, struct rtentry *, int);
371 void rt_newmaddrmsg(int, struct ifmultiaddr *);
372 int rt_setgate(struct rtentry *, struct sockaddr *, struct sockaddr *);
373 void rt_maskedcopy(struct sockaddr *, struct sockaddr *, struct sockaddr *);
374
375 /*
376 * Note the following locking behavior:
377 *
378 * rtalloc_ign() and rtalloc() return ro->ro_rt unlocked
379 *
380 * rtalloc1() returns a locked rtentry
381 *
382 * rtfree() and RTFREE_LOCKED() require a locked rtentry
383 *
384 * RTFREE() uses an unlocked entry.
385 */
386
387 int rtexpunge(struct rtentry *);
388 void rtfree(struct rtentry *);
389 int rt_check(struct rtentry **, struct rtentry **, struct sockaddr *);
390
391 /* XXX MRT COMPAT VERSIONS THAT SET UNIVERSE to 0 */
392 /* Thes are used by old code not yet converted to use multiple FIBS */
393 int rt_getifa(struct rt_addrinfo *);
394 void rtalloc_ign(struct route *ro, u_long ignflags);
395 void rtalloc(struct route *ro); /* XXX deprecated, use rtalloc_ign(ro, 0) */
396 struct rtentry *rtalloc1(struct sockaddr *, int, u_long);
397 int rtinit(struct ifaddr *, int, int);
398 int rtioctl(u_long, caddr_t);
399 void rtredirect(struct sockaddr *, struct sockaddr *,
400 struct sockaddr *, int, struct sockaddr *);
401 int rtrequest(int, struct sockaddr *,
402 struct sockaddr *, struct sockaddr *, int, struct rtentry **);
403
404 /* defaults to "all" FIBs */
405 int rtinit_fib(struct ifaddr *, int, int);
406
407 /* XXX MRT NEW VERSIONS THAT USE FIBs
408 * For now the protocol indepedent versions are the same as the AF_INET ones
409 * but this will change..
410 */
411 int rt_getifa_fib(struct rt_addrinfo *, u_int fibnum);
412 void rtalloc_ign_fib(struct route *ro, u_long ignflags, u_int fibnum);
413 void rtalloc_fib(struct route *ro, u_int fibnum);
414 struct rtentry *rtalloc1_fib(struct sockaddr *, int, u_long, u_int);
415 int rtioctl_fib(u_long, caddr_t, u_int);
416 void rtredirect_fib(struct sockaddr *, struct sockaddr *,
417 struct sockaddr *, int, struct sockaddr *, u_int);
418 int rtrequest_fib(int, struct sockaddr *,
419 struct sockaddr *, struct sockaddr *, int, struct rtentry **, u_int);
420 int rtrequest1_fib(int, struct rt_addrinfo *, struct rtentry **, u_int);
421
422 #include <sys/eventhandler.h>
423 typedef void (*rtevent_arp_update_fn)(void *, struct rtentry *, uint8_t *, struct sockaddr *);
424 typedef void (*rtevent_redirect_fn)(void *, struct rtentry *, struct rtentry *, struct sockaddr *);
425 EVENTHANDLER_DECLARE(route_arp_update_event, rtevent_arp_update_fn);
426 EVENTHANDLER_DECLARE(route_redirect_event, rtevent_redirect_fn);
427 #endif
428
429 #endif
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