1 /* $OpenBSD: route.h,v 1.75 2010/10/28 17:18:35 claudio Exp $ */ 2 /* $NetBSD: route.h,v 1.9 1996/02/13 22:00:49 christos Exp $ */ 3 4 /* 5 * Copyright (c) 1980, 1986, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * @(#)route.h 8.3 (Berkeley) 4/19/94 33 */ 34 35 #ifndef _NET_ROUTE_H_ 36 #define _NET_ROUTE_H_ 37 38 #include <sys/queue.h> 39 40 /* 41 * Kernel resident routing tables. 42 * 43 * The routing tables are initialized when interface addresses 44 * are set by making entries for all directly connected interfaces. 45 */ 46 47 /* 48 * A route consists of a destination address and a reference 49 * to a routing entry. These are often held by protocols 50 * in their control blocks, e.g. inpcb. 51 */ 52 struct route { 53 struct rtentry *ro_rt; 54 u_long ro_tableid; /* u_long because of alignment */ 55 struct sockaddr ro_dst; 56 }; 57 58 /* 59 * These numbers are used by reliable protocols for determining 60 * retransmission behavior and are included in the routing structure. 61 */ 62 struct rt_kmetrics { 63 u_int64_t rmx_pksent; /* packets sent using this route */ 64 u_int rmx_locks; /* Kernel must leave these values */ 65 u_int rmx_mtu; /* MTU for this path */ 66 u_int rmx_expire; /* lifetime for route, e.g. redirect */ 67 u_int rmx_pad; 68 }; 69 70 /* 71 * Huge version for userland compatibility. 72 */ 73 struct rt_metrics { 74 u_int64_t rmx_pksent; /* packets sent using this route */ 75 u_int rmx_locks; /* Kernel must leave these values */ 76 u_int rmx_mtu; /* MTU for this path */ 77 u_int rmx_expire; /* lifetime for route, e.g. redirect */ 78 u_int rmx_refcnt; /* # references hold */ 79 /* some apps may still need these no longer used metrics */ 80 u_int rmx_hopcount; /* max hops expected */ 81 u_int rmx_recvpipe; /* inbound delay-bandwidth product */ 82 u_int rmx_sendpipe; /* outbound delay-bandwidth product */ 83 u_int rmx_ssthresh; /* outbound gateway buffer limit */ 84 u_int rmx_rtt; /* estimated round trip time */ 85 u_int rmx_rttvar; /* estimated rtt variance */ 86 }; 87 88 /* 89 * rmx_rtt and rmx_rttvar are stored as microseconds; 90 * RTTTOPRHZ(rtt) converts to a value suitable for use 91 * by a protocol slowtimo counter. 92 */ 93 #define RTM_RTTUNIT 1000000 /* units for rtt, rttvar, as units per sec */ 94 #define RTTTOPRHZ(r) ((r) / (RTM_RTTUNIT / PR_SLOWHZ)) 95 96 /* 97 * We distinguish between routes to hosts and routes to networks, 98 * preferring the former if available. For each route we infer 99 * the interface to use from the gateway address supplied when 100 * the route was entered. Routes that forward packets through 101 * gateways are marked so that the output routines know to address the 102 * gateway rather than the ultimate destination. 103 */ 104 #ifndef RNF_NORMAL 105 #include <net/radix.h> 106 #include <net/radix_mpath.h> 107 #endif 108 struct rtentry { 109 struct radix_node rt_nodes[2]; /* tree glue, and other values */ 110 #define rt_key(r) ((struct sockaddr *)((r)->rt_nodes->rn_key)) 111 #define rt_mask(r) ((struct sockaddr *)((r)->rt_nodes->rn_mask)) 112 struct sockaddr *rt_gateway; /* value */ 113 u_int rt_flags; /* up/down?, host/net */ 114 int rt_refcnt; /* # held references */ 115 struct ifnet *rt_ifp; /* the answer: interface to use */ 116 struct ifaddr *rt_ifa; /* the answer: interface addr to use */ 117 struct sockaddr *rt_genmask; /* for generation of cloned routes */ 118 caddr_t rt_llinfo; /* pointer to link level info cache or 119 to an MPLS structure */ 120 struct rt_kmetrics rt_rmx; /* metrics used by rx'ing protocols */ 121 struct rtentry *rt_gwroute; /* implied entry for gatewayed routes */ 122 struct rtentry *rt_parent; /* If cloned, parent of this route. */ 123 LIST_HEAD(, rttimer) rt_timer; /* queue of timeouts for misc funcs */ 124 u_int16_t rt_labelid; /* route label ID */ 125 u_int8_t rt_priority; /* routing priority to use */ 126 }; 127 #define rt_use rt_rmx.rmx_pksent 128 129 #define RTF_UP 0x1 /* route usable */ 130 #define RTF_GATEWAY 0x2 /* destination is a gateway */ 131 #define RTF_HOST 0x4 /* host entry (net otherwise) */ 132 #define RTF_REJECT 0x8 /* host or net unreachable */ 133 #define RTF_DYNAMIC 0x10 /* created dynamically (by redirect) */ 134 #define RTF_MODIFIED 0x20 /* modified dynamically (by redirect) */ 135 #define RTF_DONE 0x40 /* message confirmed */ 136 #define RTF_MASK 0x80 /* subnet mask present */ 137 #define RTF_CLONING 0x100 /* generate new routes on use */ 138 #define RTF_XRESOLVE 0x200 /* external daemon resolves name */ 139 #define RTF_LLINFO 0x400 /* generated by ARP or ESIS */ 140 #define RTF_STATIC 0x800 /* manually added */ 141 #define RTF_BLACKHOLE 0x1000 /* just discard pkts (during updates) */ 142 #define RTF_PROTO3 0x2000 /* protocol specific routing flag */ 143 #define RTF_PROTO2 0x4000 /* protocol specific routing flag */ 144 #define RTF_PROTO1 0x8000 /* protocol specific routing flag */ 145 #define RTF_CLONED 0x10000 /* this is a cloned route */ 146 #define RTF_MPATH 0x40000 /* multipath route or operation */ 147 #define RTF_JUMBO 0x80000 /* try to use jumbo frames */ 148 #define RTF_MPLS 0x100000 /* MPLS additional infos */ 149 150 /* mask of RTF flags that are allowed to be modified by RTM_CHANGE */ 151 #define RTF_FMASK \ 152 (RTF_JUMBO | RTF_PROTO1 | RTF_PROTO2 | RTF_PROTO3 | RTF_BLACKHOLE | \ 153 RTF_REJECT | RTF_STATIC) 154 155 #ifndef _KERNEL 156 /* obsoleted */ 157 #define RTF_SOURCE 0x20000 /* this route has a source selector */ 158 #define RTF_TUNNEL 0x100000 /* Tunnelling bit. */ 159 #endif 160 161 /* Routing priorities used by the different routing protocols */ 162 #define RTP_NONE 0 /* unset priority use sane default */ 163 #define RTP_CONNECTED 4 /* directly connected routes */ 164 #define RTP_STATIC 8 /* static routes base priority */ 165 #define RTP_OSPF 32 /* OSPF routes */ 166 #define RTP_ISIS 36 /* IS-IS routes */ 167 #define RTP_RIP 40 /* RIP routes */ 168 #define RTP_BGP 48 /* BGP routes */ 169 #define RTP_DEFAULT 56 /* routes that have nothing set */ 170 #define RTP_MAX 63 /* maximum priority */ 171 #define RTP_ANY 64 /* any of the above */ 172 #define RTP_MASK 0x7f 173 #define RTP_DOWN 0x80 /* route/link is down */ 174 175 /* 176 * Routing statistics. 177 */ 178 struct rtstat { 179 u_int32_t rts_badredirect; /* bogus redirect calls */ 180 u_int32_t rts_dynamic; /* routes created by redirects */ 181 u_int32_t rts_newgateway; /* routes modified by redirects */ 182 u_int32_t rts_unreach; /* lookups which failed */ 183 u_int32_t rts_wildcard; /* lookups satisfied by a wildcard */ 184 }; 185 186 /* 187 * Routing Table Info. 188 */ 189 struct rt_tableinfo { 190 u_short rti_tableid; /* routing table id */ 191 u_short rti_domainid; /* routing domain id */ 192 }; 193 194 /* 195 * Structures for routing messages. 196 */ 197 struct rt_msghdr { 198 u_short rtm_msglen; /* to skip over non-understood messages */ 199 u_char rtm_version; /* future binary compatibility */ 200 u_char rtm_type; /* message type */ 201 u_short rtm_hdrlen; /* sizeof(rt_msghdr) to skip over the header */ 202 u_short rtm_index; /* index for associated ifp */ 203 u_short rtm_tableid; /* routing table id */ 204 u_char rtm_priority; /* routing priority */ 205 u_char rtm_mpls; /* MPLS additional infos */ 206 int rtm_addrs; /* bitmask identifying sockaddrs in msg */ 207 int rtm_flags; /* flags, incl. kern & message, e.g. DONE */ 208 int rtm_fmask; /* bitmask used in RTM_CHANGE message */ 209 pid_t rtm_pid; /* identify sender */ 210 int rtm_seq; /* for sender to identify action */ 211 int rtm_errno; /* why failed */ 212 u_int rtm_inits; /* which metrics we are initializing */ 213 struct rt_metrics rtm_rmx; /* metrics themselves */ 214 }; 215 /* overload no longer used field */ 216 #define rtm_use rtm_rmx.rmx_pksent 217 218 #define RTM_VERSION 4 /* Up the ante and ignore older versions */ 219 220 #define RTM_MAXSIZE 2048 /* Maximum size of an accepted route msg */ 221 222 #define RTM_ADD 0x1 /* Add Route */ 223 #define RTM_DELETE 0x2 /* Delete Route */ 224 #define RTM_CHANGE 0x3 /* Change Metrics or flags */ 225 #define RTM_GET 0x4 /* Report Metrics */ 226 #define RTM_LOSING 0x5 /* Kernel Suspects Partitioning */ 227 #define RTM_REDIRECT 0x6 /* Told to use different route */ 228 #define RTM_MISS 0x7 /* Lookup failed on this address */ 229 #define RTM_LOCK 0x8 /* fix specified metrics */ 230 #define RTM_RESOLVE 0xb /* req to resolve dst to LL addr */ 231 #define RTM_NEWADDR 0xc /* address being added to iface */ 232 #define RTM_DELADDR 0xd /* address being removed from iface */ 233 #define RTM_IFINFO 0xe /* iface going up/down etc. */ 234 #define RTM_IFANNOUNCE 0xf /* iface arrival/departure */ 235 #define RTM_DESYNC 0x10 /* route socket buffer overflow */ 236 237 #define RTV_MTU 0x1 /* init or lock _mtu */ 238 #define RTV_HOPCOUNT 0x2 /* init or lock _hopcount */ 239 #define RTV_EXPIRE 0x4 /* init or lock _hopcount */ 240 #define RTV_RPIPE 0x8 /* init or lock _recvpipe */ 241 #define RTV_SPIPE 0x10 /* init or lock _sendpipe */ 242 #define RTV_SSTHRESH 0x20 /* init or lock _ssthresh */ 243 #define RTV_RTT 0x40 /* init or lock _rtt */ 244 #define RTV_RTTVAR 0x80 /* init or lock _rttvar */ 245 246 /* 247 * Bitmask values for rtm_addr. 248 */ 249 #define RTA_DST 0x1 /* destination sockaddr present */ 250 #define RTA_GATEWAY 0x2 /* gateway sockaddr present */ 251 #define RTA_NETMASK 0x4 /* netmask sockaddr present */ 252 #define RTA_GENMASK 0x8 /* cloning mask sockaddr present */ 253 #define RTA_IFP 0x10 /* interface name sockaddr present */ 254 #define RTA_IFA 0x20 /* interface addr sockaddr present */ 255 #define RTA_AUTHOR 0x40 /* sockaddr for author of redirect */ 256 #define RTA_BRD 0x80 /* for NEWADDR, broadcast or p-p dest addr */ 257 #define RTA_SRC 0x100 /* source sockaddr present */ 258 #define RTA_SRCMASK 0x200 /* source netmask present */ 259 #define RTA_LABEL 0x400 /* route label present */ 260 261 /* 262 * Index offsets for sockaddr array for alternate internal encoding. 263 */ 264 #define RTAX_DST 0 /* destination sockaddr present */ 265 #define RTAX_GATEWAY 1 /* gateway sockaddr present */ 266 #define RTAX_NETMASK 2 /* netmask sockaddr present */ 267 #define RTAX_GENMASK 3 /* cloning mask sockaddr present */ 268 #define RTAX_IFP 4 /* interface name sockaddr present */ 269 #define RTAX_IFA 5 /* interface addr sockaddr present */ 270 #define RTAX_AUTHOR 6 /* sockaddr for author of redirect */ 271 #define RTAX_BRD 7 /* for NEWADDR, broadcast or p-p dest addr */ 272 #define RTAX_SRC 8 /* source sockaddr present */ 273 #define RTAX_SRCMASK 9 /* source netmask present */ 274 #define RTAX_LABEL 10 /* route label present */ 275 #define RTAX_MAX 11 /* size of array to allocate */ 276 277 /* 278 * setsockopt defines used for the filtering. 279 */ 280 #define ROUTE_MSGFILTER 1 /* bitmask to specifiy which types should be 281 sent to the client. */ 282 #define ROUTE_TABLEFILTER 2 /* change routing table the socket is listening 283 on, RTABLE_ANY listens on all tables. */ 284 285 #define ROUTE_FILTER(m) (1 << (m)) 286 #define RTABLE_ANY 0xffffffff 287 288 struct rt_addrinfo { 289 int rti_addrs; 290 struct sockaddr *rti_info[RTAX_MAX]; 291 int rti_flags; 292 struct ifaddr *rti_ifa; 293 struct ifnet *rti_ifp; 294 struct rt_msghdr *rti_rtm; 295 u_char rti_mpls; 296 }; 297 298 struct route_cb { 299 int ip_count; 300 int ip6_count; 301 int mpls_count; 302 int any_count; 303 }; 304 305 /* 306 * This structure, and the prototypes for the rt_timer_{init,remove_all, 307 * add,timer} functions all used with the kind permission of BSDI. 308 * These allow functions to be called for routes at specific times. 309 */ 310 311 struct rttimer { 312 TAILQ_ENTRY(rttimer) rtt_next; /* entry on timer queue */ 313 LIST_ENTRY(rttimer) rtt_link; /* multiple timers per rtentry */ 314 struct rttimer_queue *rtt_queue;/* back pointer to queue */ 315 struct rtentry *rtt_rt; /* Back pointer to the route */ 316 void (*rtt_func)(struct rtentry *, 317 struct rttimer *); 318 time_t rtt_time; /* When this timer was registered */ 319 u_int rtt_tableid; /* routing table id of rtt_rt */ 320 }; 321 322 struct rttimer_queue { 323 long rtq_timeout; 324 unsigned long rtq_count; 325 TAILQ_HEAD(, rttimer) rtq_head; 326 LIST_ENTRY(rttimer_queue) rtq_link; 327 }; 328 329 #define RTLABEL_LEN 32 330 331 struct sockaddr_rtlabel { 332 u_int8_t sr_len; /* total length */ 333 sa_family_t sr_family; /* address family */ 334 char sr_label[RTLABEL_LEN]; 335 }; 336 337 #ifdef _KERNEL 338 const char *rtlabel_id2name(u_int16_t); 339 u_int16_t rtlabel_name2id(char *); 340 struct sockaddr *rtlabel_id2sa(u_int16_t, struct sockaddr_rtlabel *); 341 void rtlabel_unref(u_int16_t); 342 343 #define RTFREE(rt) do { \ 344 if ((rt)->rt_refcnt <= 1) \ 345 rtfree(rt); \ 346 else \ 347 (rt)->rt_refcnt--; \ 348 } while (/* CONSTCOND */0) 349 350 /* 351 * Values for additional argument to rtalloc1() 352 */ 353 #define RT_REPORT 0x1 354 #define RT_NOCLONING 0x2 355 356 extern struct route_cb route_cb; 357 extern struct rtstat rtstat; 358 extern const struct sockaddr_rtin rt_defmask4; 359 360 struct socket; 361 void route_init(void); 362 int rtable_add(u_int); 363 u_int rtable_l2(u_int); 364 void rtable_l2set(u_int, u_int); 365 int rtable_exists(u_int); 366 int route_output(struct mbuf *, ...); 367 int route_usrreq(struct socket *, int, struct mbuf *, 368 struct mbuf *, struct mbuf *, struct proc *); 369 void rt_ifmsg(struct ifnet *); 370 void rt_ifannouncemsg(struct ifnet *, int); 371 void rt_maskedcopy(struct sockaddr *, 372 struct sockaddr *, struct sockaddr *); 373 void rt_missmsg(int, struct rt_addrinfo *, int, struct ifnet *, int, 374 u_int); 375 void rt_newaddrmsg(int, struct ifaddr *, int, struct rtentry *); 376 int rt_setgate(struct rtentry *, struct sockaddr *, 377 struct sockaddr *, u_int); 378 void rt_setmetrics(u_long, struct rt_metrics *, struct rt_kmetrics *); 379 void rt_getmetrics(struct rt_kmetrics *, struct rt_metrics *); 380 int rt_timer_add(struct rtentry *, 381 void(*)(struct rtentry *, struct rttimer *), 382 struct rttimer_queue *, u_int); 383 void rt_timer_init(void); 384 struct rttimer_queue * 385 rt_timer_queue_create(u_int); 386 void rt_timer_queue_change(struct rttimer_queue *, long); 387 void rt_timer_queue_destroy(struct rttimer_queue *, int); 388 void rt_timer_remove_all(struct rtentry *); 389 unsigned long rt_timer_count(struct rttimer_queue *); 390 void rt_timer_timer(void *); 391 void rtalloc_noclone(struct route *); 392 void rtalloc(struct route *); 393 #ifdef SMALL_KERNEL 394 #define rtalloc_mpath(r, s) rtalloc(r) 395 #endif 396 struct rtentry * 397 rtalloc1(struct sockaddr *, int, u_int); 398 void rtfree(struct rtentry *); 399 int rt_getifa(struct rt_addrinfo *, u_int); 400 int rtinit(struct ifaddr *, int, int); 401 int rtioctl(u_long, caddr_t, struct proc *); 402 void rtredirect(struct sockaddr *, struct sockaddr *, 403 struct sockaddr *, int, struct sockaddr *, 404 struct rtentry **, u_int); 405 int rtrequest1(int, struct rt_addrinfo *, u_int8_t, struct rtentry **, 406 u_int); 407 void rt_if_remove(struct ifnet *); 408 #ifndef SMALL_KERNEL 409 void rt_if_track(struct ifnet *); 410 int rt_if_linkstate_change(struct radix_node *, void *, u_int); 411 #endif 412 int rtdeletemsg(struct rtentry *, u_int); 413 414 struct radix_node_head *rt_gettable(sa_family_t, u_int); 415 struct radix_node *rt_lookup(struct sockaddr *, struct sockaddr *, u_int); 416 #endif /* _KERNEL */ 417 #endif /* _NET_ROUTE_H_ */ 418