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: src/sys/net/route.h,v 1.61.2.1 2005/01/31 23:26:23 imp Exp $
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 and a reference
45 * to a routing entry. These are often held by protocols
46 * in their control blocks, e.g. inpcb.
47 */
48 struct route {
49 struct rtentry *ro_rt;
50 struct sockaddr ro_dst;
51 };
52
53 /*
54 * These numbers are used by reliable protocols for determining
55 * retransmission behavior and are included in the routing structure.
56 */
57 struct rt_metrics_lite {
58 u_long rmx_mtu; /* MTU for this path */
59 u_long rmx_expire; /* lifetime for route, e.g. redirect */
60 u_long rmx_pksent; /* packets sent using this route */
61 };
62
63 struct rt_metrics {
64 u_long rmx_locks; /* Kernel must leave these values alone */
65 u_long rmx_mtu; /* MTU for this path */
66 u_long rmx_hopcount; /* max hops expected */
67 u_long rmx_expire; /* lifetime for route, e.g. redirect */
68 u_long rmx_recvpipe; /* inbound delay-bandwidth product */
69 u_long rmx_sendpipe; /* outbound delay-bandwidth product */
70 u_long rmx_ssthresh; /* outbound gateway buffer limit */
71 u_long rmx_rtt; /* estimated round trip time */
72 u_long rmx_rttvar; /* estimated rtt variance */
73 u_long rmx_pksent; /* packets sent using this route */
74 u_long rmx_filler[4]; /* will be used for T/TCP later */
75 };
76
77 /*
78 * rmx_rtt and rmx_rttvar are stored as microseconds;
79 * RTTTOPRHZ(rtt) converts to a value suitable for use
80 * by a protocol slowtimo counter.
81 */
82 #define RTM_RTTUNIT 1000000 /* units for rtt, rttvar, as units per sec */
83 #define RTTTOPRHZ(r) ((r) / (RTM_RTTUNIT / PR_SLOWHZ))
84
85 /*
86 * XXX kernel function pointer `rt_output' is visible to applications.
87 */
88 struct mbuf;
89
90 /*
91 * We distinguish between routes to hosts and routes to networks,
92 * preferring the former if available. For each route we infer
93 * the interface to use from the gateway address supplied when
94 * the route was entered. Routes that forward packets through
95 * gateways are marked so that the output routines know to address the
96 * gateway rather than the ultimate destination.
97 */
98 #ifndef RNF_NORMAL
99 #include <net/radix.h>
100 #endif
101 struct rtentry {
102 struct radix_node rt_nodes[2]; /* tree glue, and other values */
103 /*
104 * XXX struct rtentry must begin with a struct radix_node (or two!)
105 * because the code does some casts of a 'struct radix_node *'
106 * to a 'struct rtentry *'
107 */
108 #define rt_key(r) (*((struct sockaddr **)(&(r)->rt_nodes->rn_key)))
109 #define rt_mask(r) (*((struct sockaddr **)(&(r)->rt_nodes->rn_mask)))
110 struct sockaddr *rt_gateway; /* value */
111 u_long rt_flags; /* up/down?, host/net */
112 struct ifnet *rt_ifp; /* the answer: interface to use */
113 struct ifaddr *rt_ifa; /* the answer: interface address to use */
114 struct rt_metrics_lite rt_rmx; /* metrics used by rx'ing protocols */
115 long rt_refcnt; /* # held references */
116 struct sockaddr *rt_genmask; /* for generation of cloned routes */
117 caddr_t rt_llinfo; /* pointer to link level info cache */
118 struct rtentry *rt_gwroute; /* implied entry for gatewayed routes */
119 struct rtentry *rt_parent; /* cloning parent of this route */
120 #ifdef _KERNEL
121 /* XXX ugly, user apps use this definition but don't have a mtx def */
122 struct mtx rt_mtx; /* mutex for routing entry */
123 #endif
124 };
125
126 /*
127 * Following structure necessary for 4.3 compatibility;
128 * We should eventually move it to a compat file.
129 */
130 struct ortentry {
131 u_long rt_hash; /* to speed lookups */
132 struct sockaddr rt_dst; /* key */
133 struct sockaddr rt_gateway; /* value */
134 short rt_flags; /* up/down?, host/net */
135 short rt_refcnt; /* # held references */
136 u_long rt_use; /* raw # packets forwarded */
137 struct ifnet *rt_ifp; /* the answer: interface to use */
138 };
139
140 #define rt_use rt_rmx.rmx_pksent
141
142 #define RTF_UP 0x1 /* route usable */
143 #define RTF_GATEWAY 0x2 /* destination is a gateway */
144 #define RTF_HOST 0x4 /* host entry (net otherwise) */
145 #define RTF_REJECT 0x8 /* host or net unreachable */
146 #define RTF_DYNAMIC 0x10 /* created dynamically (by redirect) */
147 #define RTF_MODIFIED 0x20 /* modified dynamically (by redirect) */
148 #define RTF_DONE 0x40 /* message confirmed */
149 /* 0x80 unused, was RTF_DELCLONE */
150 #define RTF_CLONING 0x100 /* generate new routes on use */
151 #define RTF_XRESOLVE 0x200 /* external daemon resolves name */
152 #define RTF_LLINFO 0x400 /* generated by link layer (e.g. ARP) */
153 #define RTF_STATIC 0x800 /* manually added */
154 #define RTF_BLACKHOLE 0x1000 /* just discard pkts (during updates) */
155 #define RTF_PROTO2 0x4000 /* protocol specific routing flag */
156 #define RTF_PROTO1 0x8000 /* protocol specific routing flag */
157
158 /* XXX: temporary to stay API/ABI compatible with userland */
159 #ifndef _KERNEL
160 #define RTF_PRCLONING 0x10000 /* unused, for compatibility */
161 #endif
162
163 #define RTF_WASCLONED 0x20000 /* route generated through cloning */
164 #define RTF_PROTO3 0x40000 /* protocol specific routing flag */
165 /* 0x80000 unused */
166 #define RTF_PINNED 0x100000 /* future use */
167 #define RTF_LOCAL 0x200000 /* route represents a local address */
168 #define RTF_BROADCAST 0x400000 /* route represents a bcast address */
169 #define RTF_MULTICAST 0x800000 /* route represents a mcast address */
170 /* 0x1000000 and up unassigned */
171
172 /*
173 * Routing statistics.
174 */
175 struct rtstat {
176 short rts_badredirect; /* bogus redirect calls */
177 short rts_dynamic; /* routes created by redirects */
178 short rts_newgateway; /* routes modified by redirects */
179 short rts_unreach; /* lookups which failed */
180 short rts_wildcard; /* lookups satisfied by a wildcard */
181 };
182 /*
183 * Structures for routing messages.
184 */
185 struct rt_msghdr {
186 u_short rtm_msglen; /* to skip over non-understood messages */
187 u_char rtm_version; /* future binary compatibility */
188 u_char rtm_type; /* message type */
189 u_short rtm_index; /* index for associated ifp */
190 int rtm_flags; /* flags, incl. kern & message, e.g. DONE */
191 int rtm_addrs; /* bitmask identifying sockaddrs in msg */
192 pid_t rtm_pid; /* identify sender */
193 int rtm_seq; /* for sender to identify action */
194 int rtm_errno; /* why failed */
195 int rtm_use; /* from rtentry */
196 u_long rtm_inits; /* which metrics we are initializing */
197 struct rt_metrics rtm_rmx; /* metrics themselves */
198 };
199
200 #define RTM_VERSION 5 /* Up the ante and ignore older versions */
201
202 /*
203 * Message types.
204 */
205 #define RTM_ADD 0x1 /* Add Route */
206 #define RTM_DELETE 0x2 /* Delete Route */
207 #define RTM_CHANGE 0x3 /* Change Metrics or flags */
208 #define RTM_GET 0x4 /* Report Metrics */
209 #define RTM_LOSING 0x5 /* Kernel Suspects Partitioning */
210 #define RTM_REDIRECT 0x6 /* Told to use different route */
211 #define RTM_MISS 0x7 /* Lookup failed on this address */
212 #define RTM_LOCK 0x8 /* fix specified metrics */
213 #define RTM_OLDADD 0x9 /* caused by SIOCADDRT */
214 #define RTM_OLDDEL 0xa /* caused by SIOCDELRT */
215 #define RTM_RESOLVE 0xb /* req to resolve dst to LL addr */
216 #define RTM_NEWADDR 0xc /* address being added to iface */
217 #define RTM_DELADDR 0xd /* address being removed from iface */
218 #define RTM_IFINFO 0xe /* iface going up/down etc. */
219 #define RTM_NEWMADDR 0xf /* mcast group membership being added to if */
220 #define RTM_DELMADDR 0x10 /* mcast group membership being deleted */
221 #define RTM_IFANNOUNCE 0x11 /* iface arrival/departure */
222
223 /*
224 * Bitmask values for rtm_inits and rmx_locks.
225 */
226 #define RTV_MTU 0x1 /* init or lock _mtu */
227 #define RTV_HOPCOUNT 0x2 /* init or lock _hopcount */
228 #define RTV_EXPIRE 0x4 /* init or lock _expire */
229 #define RTV_RPIPE 0x8 /* init or lock _recvpipe */
230 #define RTV_SPIPE 0x10 /* init or lock _sendpipe */
231 #define RTV_SSTHRESH 0x20 /* init or lock _ssthresh */
232 #define RTV_RTT 0x40 /* init or lock _rtt */
233 #define RTV_RTTVAR 0x80 /* init or lock _rttvar */
234
235 /*
236 * Bitmask values for rtm_addrs.
237 */
238 #define RTA_DST 0x1 /* destination sockaddr present */
239 #define RTA_GATEWAY 0x2 /* gateway sockaddr present */
240 #define RTA_NETMASK 0x4 /* netmask sockaddr present */
241 #define RTA_GENMASK 0x8 /* cloning mask sockaddr present */
242 #define RTA_IFP 0x10 /* interface name sockaddr present */
243 #define RTA_IFA 0x20 /* interface addr sockaddr present */
244 #define RTA_AUTHOR 0x40 /* sockaddr for author of redirect */
245 #define RTA_BRD 0x80 /* for NEWADDR, broadcast or p-p dest addr */
246
247 /*
248 * Index offsets for sockaddr array for alternate internal encoding.
249 */
250 #define RTAX_DST 0 /* destination sockaddr present */
251 #define RTAX_GATEWAY 1 /* gateway sockaddr present */
252 #define RTAX_NETMASK 2 /* netmask sockaddr present */
253 #define RTAX_GENMASK 3 /* cloning mask sockaddr present */
254 #define RTAX_IFP 4 /* interface name sockaddr present */
255 #define RTAX_IFA 5 /* interface addr sockaddr present */
256 #define RTAX_AUTHOR 6 /* sockaddr for author of redirect */
257 #define RTAX_BRD 7 /* for NEWADDR, broadcast or p-p dest addr */
258 #define RTAX_MAX 8 /* size of array to allocate */
259
260 struct rt_addrinfo {
261 int rti_addrs;
262 struct sockaddr *rti_info[RTAX_MAX];
263 int rti_flags;
264 struct ifaddr *rti_ifa;
265 struct ifnet *rti_ifp;
266 };
267
268 /*
269 * This macro returns the size of a struct sockaddr when passed
270 * through a routing socket. Basically we round up sa_len to
271 * a multiple of sizeof(long), with a minimum of sizeof(long).
272 * The check for a NULL pointer is just a convenience, probably never used.
273 * The case sa_len == 0 should only apply to empty structures.
274 */
275 #define SA_SIZE(sa) \
276 ( (!(sa) || ((struct sockaddr *)(sa))->sa_len == 0) ? \
277 sizeof(long) : \
278 1 + ( (((struct sockaddr *)(sa))->sa_len - 1) | (sizeof(long) - 1) ) )
279
280 #ifdef _KERNEL
281
282 #define RT_LOCK_INIT(_rt) \
283 mtx_init(&(_rt)->rt_mtx, "rtentry", NULL, MTX_DEF | MTX_DUPOK)
284 #define RT_LOCK(_rt) mtx_lock(&(_rt)->rt_mtx)
285 #define RT_UNLOCK(_rt) mtx_unlock(&(_rt)->rt_mtx)
286 #define RT_LOCK_DESTROY(_rt) mtx_destroy(&(_rt)->rt_mtx)
287 #define RT_LOCK_ASSERT(_rt) mtx_assert(&(_rt)->rt_mtx, MA_OWNED)
288
289 #define RT_ADDREF(_rt) do { \
290 RT_LOCK_ASSERT(_rt); \
291 KASSERT((_rt)->rt_refcnt >= 0, \
292 ("negative refcnt %ld", (_rt)->rt_refcnt)); \
293 (_rt)->rt_refcnt++; \
294 } while (0);
295 #define RT_REMREF(_rt) do { \
296 RT_LOCK_ASSERT(_rt); \
297 KASSERT((_rt)->rt_refcnt > 0, \
298 ("bogus refcnt %ld", (_rt)->rt_refcnt)); \
299 (_rt)->rt_refcnt--; \
300 } while (0);
301
302 #define RTFREE_LOCKED(_rt) do { \
303 if ((_rt)->rt_refcnt <= 1) \
304 rtfree(_rt); \
305 else { \
306 RT_REMREF(_rt); \
307 RT_UNLOCK(_rt); \
308 } \
309 /* guard against invalid refs */ \
310 _rt = 0; \
311 } while (0)
312 #define RTFREE(_rt) do { \
313 RT_LOCK(_rt); \
314 RTFREE_LOCKED(_rt); \
315 } while (0)
316
317 extern struct radix_node_head *rt_tables[AF_MAX+1];
318
319 struct ifmultiaddr;
320
321 int rt_getifa(struct rt_addrinfo *);
322 void rt_ifannouncemsg(struct ifnet *, int);
323 void rt_ifmsg(struct ifnet *);
324 void rt_missmsg(int, struct rt_addrinfo *, int, int);
325 void rt_newaddrmsg(int, struct ifaddr *, int, struct rtentry *);
326 void rt_newmaddrmsg(int, struct ifmultiaddr *);
327 int rt_setgate(struct rtentry *, struct sockaddr *, struct sockaddr *);
328
329 /*
330 * Note the following locking behavior:
331 *
332 * rtalloc_ign() and rtalloc() return ro->ro_rt unlocked
333 *
334 * rtalloc1() returns a locked rtentry
335 *
336 * rtfree() and RTFREE_LOCKED() require a locked rtentry
337 *
338 * RTFREE() uses an unlocked entry.
339 */
340
341 void rtalloc_ign(struct route *ro, u_long ignflags);
342 void rtalloc(struct route *ro); /* XXX deprecated, use rtalloc_ign(ro, 0) */
343 struct rtentry *rtalloc1(struct sockaddr *, int, u_long);
344 int rtexpunge(struct rtentry *);
345 void rtfree(struct rtentry *);
346 int rtinit(struct ifaddr *, int, int);
347 int rtioctl(u_long, caddr_t);
348 void rtredirect(struct sockaddr *, struct sockaddr *,
349 struct sockaddr *, int, struct sockaddr *);
350 int rtrequest(int, struct sockaddr *,
351 struct sockaddr *, struct sockaddr *, int, struct rtentry **);
352 int rtrequest1(int, struct rt_addrinfo *, struct rtentry **);
353 int rt_check(struct rtentry **, struct rtentry **, struct sockaddr *);
354 #endif
355
356 #endif
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