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54 * @(#)route.h 8.3 (Berkeley) 4/19/94
55 * $FreeBSD: src/sys/net/route.h,v 1.36.2.1 2000/08/16 06:14:23 jayanth Exp $
62 * Kernel resident routing tables.
64 * The routing tables are initialized when interface addresses
65 * are set by making entries for all directly connected interfaces.
69 * A route consists of a destination address and a reference
70 * to a routing entry. These are often held by protocols
71 * in their control blocks, e.g. inpcb.
74 struct rtentry *ro_rt;
76 struct sockaddr_storage rou_dst_ss;
77 struct sockaddr ro_dst_sa;
80 #define ro_dst ro_u.ro_dst_sa
83 * These numbers are used by reliable protocols for determining
84 * retransmission behavior and are included in the routing structure.
87 u_long rmx_locks; /* Kernel must leave these values alone */
88 u_long rmx_mtu; /* MTU for this path */
89 u_long rmx_hopcount; /* max hops expected */
90 u_long rmx_expire; /* lifetime for route, e.g. redirect */
91 u_long rmx_recvpipe; /* inbound delay-bandwidth product */
92 u_long rmx_sendpipe; /* outbound delay-bandwidth product */
93 u_long rmx_ssthresh; /* outbound gateway buffer limit */
94 u_long rmx_rtt; /* estimated round trip time */
95 u_long rmx_rttvar; /* estimated rtt variance */
96 u_long rmx_pksent; /* packets sent using this route */
97 u_long rmx_filler[4]; /* will be used for T/TCP later */
101 * rmx_rtt and rmx_rttvar are stored as microseconds;
102 * RTTTOPRHZ(rtt) converts to a value suitable for use
103 * by a protocol slowtimo counter.
105 #define RTM_RTTUNIT 1000000 /* units for rtt, rttvar, as units per sec */
106 #define RTTTOPRHZ(r) ((r) / (RTM_RTTUNIT / PR_SLOWHZ))
109 * XXX kernel function pointer `rt_output' is visible to applications.
114 * We distinguish between routes to hosts and routes to networks,
115 * preferring the former if available. For each route we infer
116 * the interface to use from the gateway address supplied when
117 * the route was entered. Routes that forward packets through
118 * gateways are marked so that the output routines know to address the
119 * gateway rather than the ultimate destination.
122 #include <net/radix.h>
125 struct radix_node rt_nodes[2]; /* tree glue, and other values */
126 #define rt_key(r) ((struct sockaddr *)((r)->rt_nodes->rn_key))
127 #define rt_mask(r) ((struct sockaddr *)((r)->rt_nodes->rn_mask))
128 struct sockaddr *rt_gateway; /* value */
129 long rt_refcnt; /* # held references */
130 u_long rt_flags; /* up/down?, host/net */
131 struct ifnet *rt_ifp; /* the answer: interface to use */
132 struct ifaddr *rt_ifa; /* the answer: interface to use */
133 struct sockaddr *rt_genmask; /* for generation of cloned routes */
134 caddr_t rt_llinfo; /* pointer to link level info cache */
135 struct rt_metrics rt_rmx; /* metrics used by rx'ing protocols */
136 struct rtentry *rt_gwroute; /* implied entry for gatewayed routes */
137 int (*rt_output) __P((struct ifnet *, struct mbuf *,
138 struct sockaddr *, struct rtentry *));
139 /* output routine for this (rt,if) */
140 struct rtentry *rt_parent; /* cloning parent of this route */
141 void *rt_filler2; /* more filler */
145 * Following structure necessary for 4.3 compatibility;
146 * We should eventually move it to a compat file.
149 u_long rt_hash; /* to speed lookups */
150 struct sockaddr rt_dst; /* key */
151 struct sockaddr rt_gateway; /* value */
152 short rt_flags; /* up/down?, host/net */
153 short rt_refcnt; /* # held references */
154 u_long rt_use; /* raw # packets forwarded */
155 struct ifnet *rt_ifp; /* the answer: interface to use */
158 #define rt_use rt_rmx.rmx_pksent
161 * This structure modelled after the Linux 'route' functions
162 * Used by the SIOCADDRT and SIOCDELRT calls
164 struct ecos_rtentry {
165 struct sockaddr rt_dst; /* Target address. */
166 struct sockaddr rt_gateway; /* Gateway addr (RTF_GATEWAY). */
167 struct sockaddr rt_genmask; /* Target network mask (IP). */
168 unsigned short int rt_flags;
169 unsigned char rt_tos;
170 unsigned char rt_class;
171 short int rt_metric; /* +1 for binary compatibility! */
172 char *rt_dev; /* Forcing the device at add. */
173 unsigned long int rt_mtu; /* Per route MTU/Window. */
174 unsigned long int rt_window; /* Window clamping. */
175 unsigned short int rt_irtt; /* Initial RTT. */
177 /* Compatibility hack. */
178 #define rt_mss rt_mtu
180 #define RTF_UP 0x1 /* route usable */
181 #define RTF_GATEWAY 0x2 /* destination is a gateway */
182 #define RTF_HOST 0x4 /* host entry (net otherwise) */
183 #define RTF_REJECT 0x8 /* host or net unreachable */
184 #define RTF_DYNAMIC 0x10 /* created dynamically (by redirect) */
185 #define RTF_MODIFIED 0x20 /* modified dynamically (by redirect) */
186 #define RTF_DONE 0x40 /* message confirmed */
187 #define RTF_DELCLONE 0x80 /* delete cloned route */
188 #define RTF_CLONING 0x100 /* generate new routes on use */
189 #define RTF_XRESOLVE 0x200 /* external daemon resolves name */
190 #define RTF_LLINFO 0x400 /* generated by link layer (e.g. ARP) */
191 #define RTF_STATIC 0x800 /* manually added */
192 #define RTF_BLACKHOLE 0x1000 /* just discard pkts (during updates) */
193 #define RTF_PROTO2 0x4000 /* protocol specific routing flag */
194 #define RTF_PROTO1 0x8000 /* protocol specific routing flag */
196 #define RTF_PRCLONING 0x10000 /* protocol requires cloning */
197 #define RTF_WASCLONED 0x20000 /* route generated through cloning */
198 #define RTF_PROTO3 0x40000 /* protocol specific routing flag */
200 #define RTF_PINNED 0x100000 /* future use */
201 #define RTF_LOCAL 0x200000 /* route represents a local address */
202 #define RTF_BROADCAST 0x400000 /* route represents a bcast address */
203 #define RTF_MULTICAST 0x800000 /* route represents a mcast address */
204 /* 0x1000000 and up unassigned */
207 * Routing statistics.
210 short rts_badredirect; /* bogus redirect calls */
211 short rts_dynamic; /* routes created by redirects */
212 short rts_newgateway; /* routes modified by redirects */
213 short rts_unreach; /* lookups which failed */
214 short rts_wildcard; /* lookups satisfied by a wildcard */
217 * Structures for routing messages.
220 u_short rtm_msglen; /* to skip over non-understood messages */
221 u_char rtm_version; /* future binary compatibility */
222 u_char rtm_type; /* message type */
223 u_short rtm_index; /* index for associated ifp */
224 int rtm_flags; /* flags, incl. kern & message, e.g. DONE */
225 int rtm_addrs; /* bitmask identifying sockaddrs in msg */
226 pid_t rtm_pid; /* identify sender */
227 int rtm_seq; /* for sender to identify action */
228 int rtm_errno; /* why failed */
229 int rtm_use; /* from rtentry */
230 u_long rtm_inits; /* which metrics we are initializing */
231 struct rt_metrics rtm_rmx; /* metrics themselves */
234 #define RTM_VERSION 5 /* Up the ante and ignore older versions */
239 #define RTM_ADD 0x1 /* Add Route */
240 #define RTM_DELETE 0x2 /* Delete Route */
241 #define RTM_CHANGE 0x3 /* Change Metrics or flags */
242 #define RTM_GET 0x4 /* Report Metrics */
243 #define RTM_LOSING 0x5 /* Kernel Suspects Partitioning */
244 #define RTM_REDIRECT 0x6 /* Told to use different route */
245 #define RTM_MISS 0x7 /* Lookup failed on this address */
246 #define RTM_LOCK 0x8 /* fix specified metrics */
247 #define RTM_OLDADD 0x9 /* caused by SIOCADDRT */
248 #define RTM_OLDDEL 0xa /* caused by SIOCDELRT */
249 #define RTM_RESOLVE 0xb /* req to resolve dst to LL addr */
250 #define RTM_NEWADDR 0xc /* address being added to iface */
251 #define RTM_DELADDR 0xd /* address being removed from iface */
252 #define RTM_IFINFO 0xe /* iface going up/down etc. */
253 #define RTM_NEWMADDR 0xf /* mcast group membership being added to if */
254 #define RTM_DELMADDR 0x10 /* mcast group membership being deleted */
257 * Bitmask values for rtm_inits and rmx_locks.
259 #define RTV_MTU 0x1 /* init or lock _mtu */
260 #define RTV_HOPCOUNT 0x2 /* init or lock _hopcount */
261 #define RTV_EXPIRE 0x4 /* init or lock _expire */
262 #define RTV_RPIPE 0x8 /* init or lock _recvpipe */
263 #define RTV_SPIPE 0x10 /* init or lock _sendpipe */
264 #define RTV_SSTHRESH 0x20 /* init or lock _ssthresh */
265 #define RTV_RTT 0x40 /* init or lock _rtt */
266 #define RTV_RTTVAR 0x80 /* init or lock _rttvar */
269 * Bitmask values for rtm_addrs.
271 #define RTA_DST 0x1 /* destination sockaddr present */
272 #define RTA_GATEWAY 0x2 /* gateway sockaddr present */
273 #define RTA_NETMASK 0x4 /* netmask sockaddr present */
274 #define RTA_GENMASK 0x8 /* cloning mask sockaddr present */
275 #define RTA_IFP 0x10 /* interface name sockaddr present */
276 #define RTA_IFA 0x20 /* interface addr sockaddr present */
277 #define RTA_AUTHOR 0x40 /* sockaddr for author of redirect */
278 #define RTA_BRD 0x80 /* for NEWADDR, broadcast or p-p dest addr */
281 * Index offsets for sockaddr array for alternate internal encoding.
283 #define RTAX_DST 0 /* destination sockaddr present */
284 #define RTAX_GATEWAY 1 /* gateway sockaddr present */
285 #define RTAX_NETMASK 2 /* netmask sockaddr present */
286 #define RTAX_GENMASK 3 /* cloning mask sockaddr present */
287 #define RTAX_IFP 4 /* interface name sockaddr present */
288 #define RTAX_IFA 5 /* interface addr sockaddr present */
289 #define RTAX_AUTHOR 6 /* sockaddr for author of redirect */
290 #define RTAX_BRD 7 /* for NEWADDR, broadcast or p-p dest addr */
291 #define RTAX_MAX 8 /* size of array to allocate */
295 struct sockaddr *rti_info[RTAX_MAX];
309 if ((rt)->rt_refcnt <= 1) \
315 extern struct route_cb route_cb;
316 extern struct radix_node_head *rt_tables[AF_MAX+1];
321 void route_init __P((void));
322 void rt_ifmsg __P((struct ifnet *));
323 void rt_missmsg __P((int, struct rt_addrinfo *, int, int));
324 void rt_newaddrmsg __P((int, struct ifaddr *, int, struct rtentry *));
325 void rt_newmaddrmsg __P((int, struct ifmultiaddr *));
326 int rt_setgate __P((struct rtentry *,
327 struct sockaddr *, struct sockaddr *));
328 void rtalloc __P((struct route *));
329 void rtalloc_ign __P((struct route *, u_long));
331 rtalloc1 __P((struct sockaddr *, int, u_long));
332 void rtfree __P((struct rtentry *));
333 int rtinit __P((struct ifaddr *, int, int));
334 int rtioctl __P((int, caddr_t, struct proc *));
335 void rtredirect __P((struct sockaddr *, struct sockaddr *,
336 struct sockaddr *, int, struct sockaddr *, struct rtentry **));
337 int rtrequest __P((int, struct sockaddr *,
338 struct sockaddr *, struct sockaddr *, int, struct rtentry **));