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31 * @(#)route.h 8.4 (Berkeley) 1/9/95
41 * Kernel resident routing tables.
43 * The routing tables are initialized when interface addresses
44 * are set by making entries for all directly connected interfaces.
48 * Struct route consiste of a destination address,
49 * a route entry pointer, link-layer prepend data pointer along
53 struct nhop_object *ro_nh;
54 struct llentry *ro_lle;
56 * ro_prepend and ro_plen are only used for bpf to pass in a
57 * preformed header. They are not cacheable.
62 uint16_t ro_mtu; /* saved ro_rt mtu */
64 struct sockaddr ro_dst;
67 #define RT_L2_ME_BIT 2 /* dst L2 addr is our address */
68 #define RT_MAY_LOOP_BIT 3 /* dst may require loop copy */
69 #define RT_HAS_HEADER_BIT 4 /* mbuf already have its header prepended */
71 #define RT_L2_ME (1 << RT_L2_ME_BIT) /* 0x0004 */
72 #define RT_MAY_LOOP (1 << RT_MAY_LOOP_BIT) /* 0x0008 */
73 #define RT_HAS_HEADER (1 << RT_HAS_HEADER_BIT) /* 0x0010 */
75 #define RT_REJECT 0x0020 /* Destination is reject */
76 #define RT_BLACKHOLE 0x0040 /* Destination is blackhole */
77 #define RT_HAS_GW 0x0080 /* Destination has GW */
78 #define RT_LLE_CACHE 0x0100 /* Cache link layer */
81 u_long rmx_locks; /* Kernel must leave these values alone */
82 u_long rmx_mtu; /* MTU for this path */
83 u_long rmx_hopcount; /* max hops expected */
84 u_long rmx_expire; /* lifetime for route, e.g. redirect */
85 u_long rmx_recvpipe; /* inbound delay-bandwidth product */
86 u_long rmx_sendpipe; /* outbound delay-bandwidth product */
87 u_long rmx_ssthresh; /* outbound gateway buffer limit */
88 u_long rmx_rtt; /* estimated round trip time */
89 u_long rmx_rttvar; /* estimated rtt variance */
90 u_long rmx_pksent; /* packets sent using this route */
91 u_long rmx_weight; /* route weight */
92 u_long rmx_nhidx; /* route nexhop index */
93 u_long rmx_filler[2]; /* will be used for T/TCP later */
97 * rmx_rtt and rmx_rttvar are stored as microseconds;
98 * RTTTOPRHZ(rtt) converts to a value suitable for use
99 * by a protocol slowtimo counter.
101 #define RTM_RTTUNIT 1000000 /* units for rtt, rttvar, as units per sec */
102 #define RTTTOPRHZ(r) ((r) / (RTM_RTTUNIT / PR_SLOWHZ))
104 /* lle state is exported in rmx_state rt_metrics field */
105 #define rmx_state rmx_weight
107 /* default route weight */
108 #define RT_DEFAULT_WEIGHT 1
109 #define RT_MAX_WEIGHT 16777215 /* 3 bytes */
112 * Keep a generation count of routing table, incremented on route addition,
113 * so we can invalidate caches. This is accessed without a lock, as precision
116 typedef volatile u_int rt_gen_t; /* tree generation (for adds) */
117 #define RT_GEN(fibnum, af) rt_tables_get_gen(fibnum, af)
119 #define RT_DEFAULT_FIB 0 /* Explicitly mark fib=0 restricted cases */
120 #define RT_ALL_FIBS -1 /* Announce event for every fib */
122 VNET_DECLARE(uint32_t, _rt_numfibs); /* number of existing route tables */
123 #define V_rt_numfibs VNET(_rt_numfibs)
124 /* temporary compat arg */
125 #define rt_numfibs V_rt_numfibs
126 VNET_DECLARE(u_int, rt_add_addr_allfibs); /* Announce interfaces to all fibs */
127 #define V_rt_add_addr_allfibs VNET(rt_add_addr_allfibs)
131 * We distinguish between routes to hosts and routes to networks,
132 * preferring the former if available. For each route we infer
133 * the interface to use from the gateway address supplied when
134 * the route was entered. Routes that forward packets through
135 * gateways are marked so that the output routines know to address the
136 * gateway rather than the ultimate destination.
138 #define RTF_UP 0x1 /* route usable */
139 #define RTF_GATEWAY 0x2 /* destination is a gateway */
140 #define RTF_HOST 0x4 /* host entry (net otherwise) */
141 #define RTF_REJECT 0x8 /* host or net unreachable */
142 #define RTF_DYNAMIC 0x10 /* created dynamically (by redirect) */
143 #define RTF_MODIFIED 0x20 /* modified dynamically (by redirect) */
144 #define RTF_DONE 0x40 /* message confirmed */
145 /* 0x80 unused, was RTF_DELCLONE */
146 /* 0x100 unused, was RTF_CLONING */
147 #define RTF_XRESOLVE 0x200 /* external daemon resolves name */
148 #define RTF_LLINFO 0x400 /* DEPRECATED - exists ONLY for backward
150 #define RTF_LLDATA 0x400 /* used by apps to add/del L2 entries */
151 #define RTF_STATIC 0x800 /* manually added */
152 #define RTF_BLACKHOLE 0x1000 /* just discard pkts (during updates) */
153 #define RTF_PROTO2 0x4000 /* protocol specific routing flag */
154 #define RTF_PROTO1 0x8000 /* protocol specific routing flag */
155 /* 0x10000 unused, was RTF_PRCLONING */
156 /* 0x20000 unused, was RTF_WASCLONED */
157 #define RTF_PROTO3 0x40000 /* protocol specific routing flag */
158 #define RTF_FIXEDMTU 0x80000 /* MTU was explicitly specified */
159 #define RTF_PINNED 0x100000 /* route is immutable */
160 #define RTF_LOCAL 0x200000 /* route represents a local address */
161 #define RTF_BROADCAST 0x400000 /* route represents a bcast address */
162 #define RTF_MULTICAST 0x800000 /* route represents a mcast address */
163 /* 0x8000000 and up unassigned */
164 #define RTF_STICKY 0x10000000 /* always route dst->src */
166 #define RTF_RNH_LOCKED 0x40000000 /* radix node head is locked */
168 #define RTF_GWFLAG_COMPAT 0x80000000 /* a compatibility bit for interacting
169 with existing routing apps */
171 /* Mask of RTF flags that are allowed to be modified by RTM_CHANGE. */
173 (RTF_PROTO1 | RTF_PROTO2 | RTF_PROTO3 | RTF_BLACKHOLE | \
174 RTF_REJECT | RTF_STATIC | RTF_STICKY)
177 * fib_ nexthop API flags.
180 /* Consumer-visible nexthop info flags */
181 #define NHF_REJECT 0x0010 /* RTF_REJECT */
182 #define NHF_BLACKHOLE 0x0020 /* RTF_BLACKHOLE */
183 #define NHF_REDIRECT 0x0040 /* RTF_DYNAMIC|RTF_MODIFIED */
184 #define NHF_DEFAULT 0x0080 /* Default route */
185 #define NHF_BROADCAST 0x0100 /* RTF_BROADCAST */
186 #define NHF_GATEWAY 0x0200 /* RTF_GATEWAY */
187 #define NHF_HOST 0x0400 /* RTF_HOST */
189 /* Nexthop request flags */
190 #define NHR_NONE 0x00 /* empty flags field */
191 #define NHR_IFAIF 0x01 /* Return ifa_ifp interface */
192 #define NHR_REF 0x02 /* For future use */
195 #define NHR_NODEFAULT 0x04 /* do not consider default route */
197 /* Control plane route request flags */
198 #define NHR_COPY 0x100 /* Copy rte data */
201 * Routing statistics.
204 uint64_t rts_badredirect; /* bogus redirect calls */
205 uint64_t rts_dynamic; /* routes created by redirects */
206 uint64_t rts_newgateway; /* routes modified by redirects */
207 uint64_t rts_unreach; /* lookups which failed */
208 uint64_t rts_wildcard; /* lookups satisfied by a wildcard */
209 uint64_t rts_nh_idx_alloc_failure; /* nexthop index alloc failure*/
210 uint64_t rts_nh_alloc_failure; /* nexthop allocation failure*/
214 * Structures for routing messages.
217 u_short rtm_msglen; /* to skip over non-understood messages */
218 u_char rtm_version; /* future binary compatibility */
219 u_char rtm_type; /* message type */
220 u_short rtm_index; /* index for associated ifp */
222 int rtm_flags; /* flags, incl. kern & message, e.g. DONE */
223 int rtm_addrs; /* bitmask identifying sockaddrs in msg */
224 pid_t rtm_pid; /* identify sender */
225 int rtm_seq; /* for sender to identify action */
226 int rtm_errno; /* why failed */
227 int rtm_fmask; /* bitmask used in RTM_CHANGE message */
228 u_long rtm_inits; /* which metrics we are initializing */
229 struct rt_metrics rtm_rmx; /* metrics themselves */
232 #define RTM_VERSION 5 /* Up the ante and ignore older versions */
237 * The format for each message is annotated below using the following
240 * (1) struct rt_msghdr
241 * (2) struct ifa_msghdr
242 * (3) struct if_msghdr
243 * (4) struct ifma_msghdr
244 * (5) struct if_announcemsghdr
247 #define RTM_ADD 0x1 /* (1) Add Route */
248 #define RTM_DELETE 0x2 /* (1) Delete Route */
249 #define RTM_CHANGE 0x3 /* (1) Change Metrics or flags */
250 #define RTM_GET 0x4 /* (1) Report Metrics */
251 #define RTM_LOSING 0x5 /* (1) Kernel Suspects Partitioning */
252 #define RTM_REDIRECT 0x6 /* (1) Told to use different route */
253 #define RTM_MISS 0x7 /* (1) Lookup failed on this address */
254 #define RTM_LOCK 0x8 /* (1) fix specified metrics */
257 #define RTM_RESOLVE 0xb /* (1) req to resolve dst to LL addr */
258 #define RTM_NEWADDR 0xc /* (2) address being added to iface */
259 #define RTM_DELADDR 0xd /* (2) address being removed from iface */
260 #define RTM_IFINFO 0xe /* (3) iface going up/down etc. */
261 #define RTM_NEWMADDR 0xf /* (4) mcast group membership being added to if */
262 #define RTM_DELMADDR 0x10 /* (4) mcast group membership being deleted */
263 #define RTM_IFANNOUNCE 0x11 /* (5) iface arrival/departure */
264 #define RTM_IEEE80211 0x12 /* (5) IEEE80211 wireless event */
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 */
277 #define RTV_WEIGHT 0x100 /* init or lock _weight */
280 * Bitmask values for rtm_addrs.
282 #define RTA_DST 0x1 /* destination sockaddr present */
283 #define RTA_GATEWAY 0x2 /* gateway sockaddr present */
284 #define RTA_NETMASK 0x4 /* netmask sockaddr present */
285 #define RTA_GENMASK 0x8 /* cloning mask sockaddr present */
286 #define RTA_IFP 0x10 /* interface name sockaddr present */
287 #define RTA_IFA 0x20 /* interface addr sockaddr present */
288 #define RTA_AUTHOR 0x40 /* sockaddr for author of redirect */
289 #define RTA_BRD 0x80 /* for NEWADDR, broadcast or p-p dest addr */
292 * Index offsets for sockaddr array for alternate internal encoding.
294 #define RTAX_DST 0 /* destination sockaddr present */
295 #define RTAX_GATEWAY 1 /* gateway sockaddr present */
296 #define RTAX_NETMASK 2 /* netmask sockaddr present */
297 #define RTAX_GENMASK 3 /* cloning mask sockaddr present */
298 #define RTAX_IFP 4 /* interface name sockaddr present */
299 #define RTAX_IFA 5 /* interface addr sockaddr present */
300 #define RTAX_AUTHOR 6 /* sockaddr for author of redirect */
301 #define RTAX_BRD 7 /* for NEWADDR, broadcast or p-p dest addr */
302 #define RTAX_MAX 8 /* size of array to allocate */
306 typedef int rt_filter_f_t(const struct rtentry *, const struct nhop_object *,
310 int rti_addrs; /* Route RTF_ flags */
311 int rti_flags; /* Route RTF_ flags */
312 struct sockaddr *rti_info[RTAX_MAX]; /* Sockaddr data */
313 struct ifaddr *rti_ifa; /* value of rt_ifa addr */
314 struct ifnet *rti_ifp; /* route interface */
315 rt_filter_f_t *rti_filter; /* filter function */
316 void *rti_filterdata; /* filter paramenters */
317 u_long rti_mflags; /* metrics RTV_ flags */
318 u_long rti_spare; /* Will be used for fib */
319 struct rt_metrics *rti_rmx; /* Pointer to route metrics */
323 * This macro returns the size of a struct sockaddr when passed
324 * through a routing socket. Basically we round up sa_len to
325 * a multiple of sizeof(long), with a minimum of sizeof(long).
326 * The case sa_len == 0 should only apply to empty structures.
328 #define SA_SIZE(sa) \
329 ( (((struct sockaddr *)(sa))->sa_len == 0) ? \
331 1 + ( (((struct sockaddr *)(sa))->sa_len - 1) | (sizeof(long) - 1) ) )
333 #define sa_equal(a, b) ( \
334 (((const struct sockaddr *)(a))->sa_len == ((const struct sockaddr *)(b))->sa_len) && \
335 (bcmp((a), (b), ((const struct sockaddr *)(b))->sa_len) == 0))
339 #define RT_LINK_IS_UP(ifp) (!((ifp)->if_capabilities & IFCAP_LINKSTATE) \
340 || (ifp)->if_link_state == LINK_STATE_UP)
342 #define RO_NHFREE(_ro) do { \
343 if ((_ro)->ro_nh) { \
344 NH_FREE((_ro)->ro_nh); \
345 (_ro)->ro_nh = NULL; \
349 #define RO_INVALIDATE_CACHE(ro) do { \
350 if ((ro)->ro_lle != NULL) { \
351 LLE_FREE((ro)->ro_lle); \
352 (ro)->ro_lle = NULL; \
354 if ((ro)->ro_nh != NULL) { \
355 NH_FREE((ro)->ro_nh); \
356 (ro)->ro_nh = NULL; \
361 * Validate a cached route based on a supplied cookie. If there is an
362 * out-of-date cache, simply free it. Update the generation number
363 * for the new allocation
365 #define NH_VALIDATE(ro, cookiep, fibnum) do { \
366 rt_gen_t cookie = RT_GEN(fibnum, (ro)->ro_dst.sa_family); \
367 if (*(cookiep) != cookie) { \
368 RO_INVALIDATE_CACHE(ro); \
369 *(cookiep) = cookie; \
376 void rt_ieee80211msg(struct ifnet *, int, void *, size_t);
377 void rt_ifannouncemsg(struct ifnet *, int);
378 void rt_ifmsg(struct ifnet *);
379 void rt_missmsg(int, struct rt_addrinfo *, int, int);
380 void rt_missmsg_fib(int, struct rt_addrinfo *, int, int, int);
381 void rt_newaddrmsg_fib(int, struct ifaddr *, struct rtentry *, int);
382 int rt_addrmsg(int, struct ifaddr *, int);
383 int rt_routemsg(int, struct rtentry *, struct ifnet *ifp, int, int);
384 int rt_routemsg_info(int, struct rt_addrinfo *, int);
385 void rt_newmaddrmsg(int, struct ifmultiaddr *);
386 void rt_maskedcopy(struct sockaddr *, struct sockaddr *, struct sockaddr *);
387 struct rib_head *rt_table_init(int, int, u_int);
388 void rt_table_destroy(struct rib_head *);
389 u_int rt_tables_get_gen(uint32_t table, sa_family_t family);
391 int rtsock_addrmsg(int, struct ifaddr *, int);
392 int rtsock_routemsg(int, struct rtentry *, struct ifnet *ifp, int, int);
393 int rtsock_routemsg_info(int, struct rt_addrinfo *, int);
395 struct sockaddr *rtsock_fix_netmask(const struct sockaddr *dst,
396 const struct sockaddr *smask, struct sockaddr_storage *dmask);
398 void rt_updatemtu(struct ifnet *);
400 void rt_flushifroutes_af(struct ifnet *, int);
401 void rt_flushifroutes(struct ifnet *ifp);
403 /* XXX MRT COMPAT VERSIONS THAT SET UNIVERSE to 0 */
404 /* Thes are used by old code not yet converted to use multiple FIBS */
405 int rtinit(struct ifaddr *, int, int);
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..
411 int rtioctl_fib(u_long, caddr_t, u_int);
412 int rib_lookup_info(uint32_t, const struct sockaddr *, uint32_t, uint32_t,
413 struct rt_addrinfo *);
414 void rib_free_info(struct rt_addrinfo *info);
417 struct nhop_object *rib_lookup(uint32_t fibnum, const struct sockaddr *dst,
418 uint32_t flags, uint32_t flowid);