2 * Copyright (c) 2004, 2005 The DragonFly Project. All rights reserved.
4 * This code is derived from software contributed to The DragonFly Project
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8 * modification, are permitted provided that the following conditions
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14 * documentation and/or other materials provided with the distribution.
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34 * Copyright (c) 2004, 2005 Jeffrey M. Hsu. All rights reserved.
36 * License terms: all terms for the DragonFly license above plus the following:
38 * 4. All advertising materials mentioning features or use of this software
39 * must display the following acknowledgement:
41 * This product includes software developed by Jeffrey M. Hsu
42 * for the DragonFly Project.
44 * This requirement may be waived with permission from Jeffrey Hsu.
45 * Permission will be granted to any DragonFly user for free.
46 * This requirement will sunset and may be removed on Jan 31, 2006,
47 * after which the standard DragonFly license (as shown above) will
52 * Copyright (c) 1980, 1986, 1993
53 * The Regents of the University of California. All rights reserved.
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56 * modification, are permitted provided that the following conditions
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61 * notice, this list of conditions and the following disclaimer in the
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64 * must display the following acknowledgement:
65 * This product includes software developed by the University of
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79 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
80 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
83 * @(#)route.h 8.4 (Berkeley) 1/9/95
84 * $FreeBSD: src/sys/net/route.h,v 1.36.2.5 2002/02/01 11:48:01 ru Exp $
85 * $DragonFly: src/sys/net/route.h,v 1.14 2005/05/01 04:05:35 hmp Exp $
92 * Kernel resident routing tables.
94 * The routing tables are initialized when interface addresses
95 * are set by making entries for all directly connected interfaces.
99 * A route consists of a destination address and a reference
100 * to a routing entry. These are often held by protocols
101 * in their control blocks, e.g. inpcb.
104 struct rtentry *ro_rt;
105 struct sockaddr ro_dst;
109 * These numbers are used by reliable protocols for determining
110 * retransmission behavior and are included in the routing structure.
112 struct rt_metrics { /* grouped for locality of reference */
113 u_long rmx_locks; /* Kernel must leave these values alone */
114 u_long rmx_mtu; /* MTU for this path */
115 u_long rmx_pksent; /* packets sent using this route */
116 u_long rmx_expire; /* lifetime for route */
118 u_long rmx_sendpipe; /* outbound delay-bandwidth product */
119 u_long rmx_ssthresh; /* outbound gateway buffer limit */
120 u_long rmx_rtt; /* estimated round trip time */
121 u_long rmx_rttvar; /* estimated rtt variance */
123 u_long rmx_recvpipe; /* inbound delay-bandwidth product */
124 u_long rmx_hopcount; /* max hops expected */
125 u_long rmx_filler[4]; /* will be used for T/TCP later */
129 * rmx_rtt and rmx_rttvar are stored as microseconds;
130 * RTTTOPRHZ(rtt) converts to a value suitable for use
131 * by a protocol slowtimo counter.
133 #define RTM_RTTUNIT 1000000 /* units for rtt, rttvar, as units per sec */
134 #define RTTTOPRHZ(r) ((r) / (RTM_RTTUNIT / PR_SLOWHZ))
137 * XXX kernel function pointer `rt_output' is visible to applications.
142 * We distinguish between routes to hosts and routes to networks,
143 * preferring the former if available. For each route we infer
144 * the interface to use from the gateway address supplied when
145 * the route was entered. Routes that forward packets through
146 * gateways are marked so that the output routines know to address the
147 * gateway rather than the ultimate destination.
150 #include <net/radix.h>
154 struct radix_node rt_nodes[2]; /* tree glue, and other values */
155 #define rt_key(r) ((struct sockaddr *)((r)->rt_nodes->rn_key))
156 #define rt_mask(r) ((struct sockaddr *)((r)->rt_nodes->rn_mask))
157 struct sockaddr *rt_gateway; /* value */
158 long rt_refcnt; /* # held references */
159 u_long rt_flags; /* up/down?, host/net */
160 struct ifnet *rt_ifp; /* the answer: interface to use */
161 struct ifaddr *rt_ifa; /* the answer: interface to use */
162 struct sockaddr *rt_genmask; /* for generation of cloned routes */
163 void *rt_llinfo; /* pointer to link level info cache */
164 struct rt_metrics rt_rmx; /* metrics used by rx'ing protocols */
165 struct rtentry *rt_gwroute; /* implied entry for gatewayed routes */
166 int (*rt_output) (struct ifnet *, struct mbuf *, struct sockaddr *,
168 /* output routine for this (rt,if) */
169 struct rtentry *rt_parent; /* cloning parent of this route */
170 void *rt_filler2; /* more filler */
174 * Following structure necessary for 4.3 compatibility;
175 * We should eventually move it to a compat file.
178 u_long rt_hash; /* to speed lookups */
179 struct sockaddr rt_dst; /* key */
180 struct sockaddr rt_gateway; /* value */
181 short rt_flags; /* up/down?, host/net */
182 short rt_refcnt; /* # held references */
183 u_long rt_use; /* raw # packets forwarded */
184 struct ifnet *rt_ifp; /* the answer: interface to use */
187 #define rt_use rt_rmx.rmx_pksent
189 #define RTF_UP 0x1 /* route usable */
190 #define RTF_GATEWAY 0x2 /* destination is a gateway */
191 #define RTF_HOST 0x4 /* host entry (net otherwise) */
192 #define RTF_REJECT 0x8 /* host or net unreachable */
193 #define RTF_DYNAMIC 0x10 /* created dynamically (by redirect) */
194 #define RTF_MODIFIED 0x20 /* modified dynamically (by redirect) */
195 #define RTF_DONE 0x40 /* message confirmed */
196 /* 0x80 unused, was RTF_DELCLONE */
197 #define RTF_CLONING 0x100 /* generate new routes on use */
198 #define RTF_XRESOLVE 0x200 /* external daemon resolves name */
199 #define RTF_LLINFO 0x400 /* generated by link layer (e.g. ARP) */
200 #define RTF_STATIC 0x800 /* manually added */
201 #define RTF_BLACKHOLE 0x1000 /* just discard pkts (during updates) */
202 #define RTF_PROTO2 0x4000 /* protocol specific routing flag */
203 #define RTF_PROTO1 0x8000 /* protocol specific routing flag */
205 #define RTF_PRCLONING 0x10000 /* protocol requires cloning */
206 #define RTF_WASCLONED 0x20000 /* route generated through cloning */
207 #define RTF_PROTO3 0x40000 /* protocol specific routing flag */
209 #define RTF_PINNED 0x100000 /* future use */
210 #define RTF_LOCAL 0x200000 /* route represents a local address */
211 #define RTF_BROADCAST 0x400000 /* route represents a bcast address */
212 #define RTF_MULTICAST 0x800000 /* route represents a mcast address */
213 /* 0x1000000 and up unassigned */
216 * Routing statistics.
218 struct rtstatistics {
219 u_long rts_badredirect; /* bogus redirect calls */
220 u_long rts_dynamic; /* routes created by redirects */
221 u_long rts_newgateway; /* routes modified by redirects */
222 u_long rts_unreach; /* lookups which failed */
223 u_long rts_wildcard; /* lookups satisfied by a wildcard */
226 * Structures for routing messages.
229 u_short rtm_msglen; /* to skip over non-understood messages */
230 u_char rtm_version; /* future binary compatibility */
231 u_char rtm_type; /* message type */
232 u_short rtm_index; /* index for associated ifp */
233 int rtm_flags; /* flags, incl. kern & message, e.g. DONE */
234 int rtm_addrs; /* bitmask identifying sockaddrs in msg */
235 pid_t rtm_pid; /* identify sender */
236 int rtm_seq; /* for sender to identify action */
237 int rtm_errno; /* why failed */
238 int rtm_use; /* from rtentry */
239 u_long rtm_inits; /* which metrics we are initializing */
240 struct rt_metrics rtm_rmx; /* metrics themselves */
243 #define RTM_VERSION 5 /* Up the ante and ignore older versions */
248 #define RTM_ADD 0x1 /* Add Route */
249 #define RTM_DELETE 0x2 /* Delete Route */
250 #define RTM_CHANGE 0x3 /* Change Metrics or flags */
251 #define RTM_GET 0x4 /* Report Metrics */
252 #define RTM_LOSING 0x5 /* Kernel Suspects Partitioning */
253 #define RTM_REDIRECT 0x6 /* Told to use different route */
254 #define RTM_MISS 0x7 /* Lookup failed on this address */
255 #define RTM_LOCK 0x8 /* fix specified metrics */
256 #define RTM_OLDADD 0x9 /* caused by SIOCADDRT */
257 #define RTM_OLDDEL 0xa /* caused by SIOCDELRT */
258 #define RTM_RESOLVE 0xb /* req to resolve dst to LL addr */
259 #define RTM_NEWADDR 0xc /* address being added to iface */
260 #define RTM_DELADDR 0xd /* address being removed from iface */
261 #define RTM_IFINFO 0xe /* iface going up/down etc. */
262 #define RTM_NEWMADDR 0xf /* mcast group membership being added to if */
263 #define RTM_DELMADDR 0x10 /* mcast group membership being deleted */
264 #define RTM_IFANNOUNCE 0x11 /* iface arrival/departure */
267 * Bitmask values for rtm_inits and rmx_locks.
269 #define RTV_MTU 0x1 /* init or lock _mtu */
270 #define RTV_HOPCOUNT 0x2 /* init or lock _hopcount */
271 #define RTV_EXPIRE 0x4 /* init or lock _expire */
272 #define RTV_RPIPE 0x8 /* init or lock _recvpipe */
273 #define RTV_SPIPE 0x10 /* init or lock _sendpipe */
274 #define RTV_SSTHRESH 0x20 /* init or lock _ssthresh */
275 #define RTV_RTT 0x40 /* init or lock _rtt */
276 #define RTV_RTTVAR 0x80 /* init or lock _rttvar */
279 * Bitmask values for rtm_addrs.
281 #define RTA_DST 0x1 /* destination sockaddr present */
282 #define RTA_GATEWAY 0x2 /* gateway sockaddr present */
283 #define RTA_NETMASK 0x4 /* netmask sockaddr present */
284 #define RTA_GENMASK 0x8 /* cloning mask sockaddr present */
285 #define RTA_IFP 0x10 /* interface name sockaddr present */
286 #define RTA_IFA 0x20 /* interface addr sockaddr present */
287 #define RTA_AUTHOR 0x40 /* sockaddr for author of redirect */
288 #define RTA_BRD 0x80 /* for NEWADDR, broadcast or p-p dest addr */
291 * Index offsets for sockaddr array for alternate internal encoding.
293 #define RTAX_DST 0 /* destination sockaddr present */
294 #define RTAX_GATEWAY 1 /* gateway sockaddr present */
295 #define RTAX_NETMASK 2 /* netmask sockaddr present */
296 #define RTAX_GENMASK 3 /* cloning mask sockaddr present */
297 #define RTAX_IFP 4 /* interface name sockaddr present */
298 #define RTAX_IFA 5 /* interface addr sockaddr present */
299 #define RTAX_AUTHOR 6 /* sockaddr for author of redirect */
300 #define RTAX_BRD 7 /* for NEWADDR, broadcast or p-p dest addr */
301 #define RTAX_MAX 8 /* size of array to allocate */
305 struct sockaddr *rti_info[RTAX_MAX];
307 struct ifaddr *rti_ifa;
308 struct ifnet *rti_ifp;
313 #define rti_dst rti_info[RTAX_DST]
314 #define rti_gateway rti_info[RTAX_GATEWAY]
315 #define rti_netmask rti_info[RTAX_NETMASK]
316 #define rti_genmask rti_info[RTAX_GENMASK]
317 #define rti_ifpaddr rti_info[RTAX_IFP]
318 #define rti_ifaaddr rti_info[RTAX_IFA]
319 #define rti_author rti_info[RTAX_AUTHOR]
320 #define rti_bcastaddr rti_info[RTAX_BRD]
322 extern struct radix_node_head *rt_tables[AF_MAX+1];
327 void route_init (void);
328 void rt_dstmsg(int type, struct sockaddr *dst, int error);
329 int rt_getifa (struct rt_addrinfo *);
330 void rt_ifannouncemsg (struct ifnet *, int);
331 void rt_ifmsg (struct ifnet *);
332 int rt_llroute (struct sockaddr *dst, struct rtentry *rt0,
333 struct rtentry **drt);
334 void rt_missmsg (int, struct rt_addrinfo *, int, int);
335 void rt_newaddrmsg (int, struct ifaddr *, int, struct rtentry *);
336 void rt_newmaddrmsg (int, struct ifmultiaddr *);
337 void rt_rtmsg(int cmd, struct rtentry *rt, struct ifnet *ifp, int error);
338 int rt_setgate (struct rtentry *,
339 struct sockaddr *, struct sockaddr *);
340 void rtalloc (struct route *);
341 void rtalloc_ign (struct route *, u_long);
344 _rtlookup (struct sockaddr *, boolean_t, u_long);
345 #define RTL_REPORTMSG TRUE
346 #define RTL_DONTREPORT FALSE
348 /* flags to ignore */
349 #define RTL_DOCLONE 0UL
350 #define RTL_DONTCLONE (RTF_CLONING | RTF_PRCLONING)
353 * Look up a route with no cloning side-effects or miss reports generated.
355 static __inline struct rtentry *
356 rtpurelookup(struct sockaddr *dst)
358 return _rtlookup(dst, RTL_DONTREPORT, RTL_DONTCLONE);
362 * Do full route lookup with cloning and reporting on misses.
364 static __inline struct rtentry *
365 rtlookup(struct sockaddr *dst)
367 return _rtlookup(dst, RTL_REPORTMSG, RTL_DOCLONE);
370 void rtfree (struct rtentry *);
371 int rtinit (struct ifaddr *, int, int);
372 int rtioctl (u_long, caddr_t, struct thread *);
373 void rtredirect (struct sockaddr *, struct sockaddr *,
374 struct sockaddr *, int, struct sockaddr *);
375 int rtrequest (int, struct sockaddr *,
376 struct sockaddr *, struct sockaddr *, int, struct rtentry **);
377 int rtrequest1 (int, struct rt_addrinfo *, struct rtentry **);
380 RTFREE(struct rtentry *rt)
382 if (rt->rt_refcnt <= 1)
388 int in_inithead(void **, int);