1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1980, 1986, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #ifndef _NET_ROUTE_H_ 33 #define _NET_ROUTE_H_ 34 35 #include <net/vnet.h> 36 37 /* 38 * Kernel resident routing tables. 39 * 40 * The routing tables are initialized when interface addresses 41 * are set by making entries for all directly connected interfaces. 42 */ 43 44 /* 45 * Struct route consiste of a destination address, 46 * a route entry pointer, link-layer prepend data pointer along 47 * with its length. 48 */ 49 struct route { 50 struct nhop_object *ro_nh; 51 struct llentry *ro_lle; 52 /* 53 * ro_prepend and ro_plen are only used for bpf to pass in a 54 * preformed header. They are not cacheable. 55 */ 56 char *ro_prepend; 57 uint16_t ro_plen; 58 uint16_t ro_flags; 59 uint16_t ro_mtu; /* saved ro_rt mtu */ 60 uint16_t spare; 61 struct sockaddr ro_dst; 62 }; 63 64 #define RT_L2_ME_BIT 2 /* dst L2 addr is our address */ 65 #define RT_MAY_LOOP_BIT 3 /* dst may require loop copy */ 66 #define RT_HAS_HEADER_BIT 4 /* mbuf already have its header prepended */ 67 68 #define RT_L2_ME (1 << RT_L2_ME_BIT) /* 0x0004 */ 69 #define RT_MAY_LOOP (1 << RT_MAY_LOOP_BIT) /* 0x0008 */ 70 #define RT_HAS_HEADER (1 << RT_HAS_HEADER_BIT) /* 0x0010 */ 71 72 #define RT_REJECT 0x0020 /* Destination is reject */ 73 #define RT_BLACKHOLE 0x0040 /* Destination is blackhole */ 74 #define RT_HAS_GW 0x0080 /* Destination has GW */ 75 #define RT_LLE_CACHE 0x0100 /* Cache link layer */ 76 77 struct rt_metrics { 78 u_long rmx_locks; /* Kernel must leave these values alone */ 79 u_long rmx_mtu; /* MTU for this path */ 80 u_long rmx_hopcount; /* max hops expected */ 81 u_long rmx_expire; /* lifetime for route, e.g. redirect */ 82 u_long rmx_recvpipe; /* inbound delay-bandwidth product */ 83 u_long rmx_sendpipe; /* outbound delay-bandwidth product */ 84 u_long rmx_ssthresh; /* outbound gateway buffer limit */ 85 u_long rmx_rtt; /* estimated round trip time */ 86 u_long rmx_rttvar; /* estimated rtt variance */ 87 u_long rmx_pksent; /* packets sent using this route */ 88 u_long rmx_weight; /* route weight */ 89 u_long rmx_nhidx; /* route nexhop index */ 90 u_long rmx_filler[2]; /* will be used for T/TCP later */ 91 }; 92 93 /* 94 * rmx_rtt and rmx_rttvar are stored as microseconds; 95 */ 96 #define RTM_RTTUNIT 1000000 /* units for rtt, rttvar, as units per sec */ 97 98 /* lle state is exported in rmx_state rt_metrics field */ 99 #define rmx_state rmx_weight 100 101 /* default route weight */ 102 #define RT_DEFAULT_WEIGHT 1 103 #define RT_MAX_WEIGHT 16777215 /* 3 bytes */ 104 105 /* 106 * Keep a generation count of routing table, incremented on route addition, 107 * so we can invalidate caches. This is accessed without a lock, as precision 108 * is not required. 109 */ 110 typedef volatile u_int rt_gen_t; /* tree generation (for adds) */ 111 #define RT_GEN(fibnum, af) rt_tables_get_gen(fibnum, af) 112 113 #define RT_DEFAULT_FIB 0 /* Explicitly mark fib=0 restricted cases */ 114 #define RT_ALL_FIBS -1 /* Announce event for every fib */ 115 #ifdef _KERNEL 116 VNET_DECLARE(uint32_t, _rt_numfibs); /* number of existing route tables */ 117 #define V_rt_numfibs VNET(_rt_numfibs) 118 /* temporary compat arg */ 119 #define rt_numfibs V_rt_numfibs 120 VNET_DECLARE(u_int, rt_add_addr_allfibs); /* Announce interfaces to all fibs */ 121 #define V_rt_add_addr_allfibs VNET(rt_add_addr_allfibs) 122 123 /* Calculate flowid for locally-originated packets */ 124 #define V_fib_hash_outbound VNET(fib_hash_outbound) 125 VNET_DECLARE(u_int, fib_hash_outbound); 126 127 /* Outbound flowid generation rules */ 128 #ifdef RSS 129 130 #define fib4_calc_packet_hash xps_proto_software_hash_v4 131 #define fib6_calc_packet_hash xps_proto_software_hash_v6 132 #define CALC_FLOWID_OUTBOUND_SENDTO true 133 134 #ifdef ROUTE_MPATH 135 #define CALC_FLOWID_OUTBOUND V_fib_hash_outbound 136 #else 137 #define CALC_FLOWID_OUTBOUND false 138 #endif 139 140 #else /* !RSS */ 141 142 #define fib4_calc_packet_hash fib4_calc_software_hash 143 #define fib6_calc_packet_hash fib6_calc_software_hash 144 145 #ifdef ROUTE_MPATH 146 #define CALC_FLOWID_OUTBOUND_SENDTO V_fib_hash_outbound 147 #define CALC_FLOWID_OUTBOUND V_fib_hash_outbound 148 #else 149 #define CALC_FLOWID_OUTBOUND_SENDTO false 150 #define CALC_FLOWID_OUTBOUND false 151 #endif 152 153 #endif /* RSS */ 154 155 156 #endif /* _KERNEL */ 157 158 /* 159 * We distinguish between routes to hosts and routes to networks, 160 * preferring the former if available. For each route we infer 161 * the interface to use from the gateway address supplied when 162 * the route was entered. Routes that forward packets through 163 * gateways are marked so that the output routines know to address the 164 * gateway rather than the ultimate destination. 165 */ 166 #define RTF_UP 0x1 /* route usable */ 167 #define RTF_GATEWAY 0x2 /* destination is a gateway */ 168 #define RTF_HOST 0x4 /* host entry (net otherwise) */ 169 #define RTF_REJECT 0x8 /* host or net unreachable */ 170 #define RTF_DYNAMIC 0x10 /* created dynamically (by redirect) */ 171 #define RTF_MODIFIED 0x20 /* modified dynamically (by redirect) */ 172 #define RTF_DONE 0x40 /* message confirmed */ 173 /* 0x80 unused, was RTF_DELCLONE */ 174 /* 0x100 unused, was RTF_CLONING */ 175 #define RTF_XRESOLVE 0x200 /* external daemon resolves name */ 176 #define RTF_LLINFO 0x400 /* DEPRECATED - exists ONLY for backward 177 compatibility */ 178 #define RTF_LLDATA 0x400 /* used by apps to add/del L2 entries */ 179 #define RTF_STATIC 0x800 /* manually added */ 180 #define RTF_BLACKHOLE 0x1000 /* just discard pkts (during updates) */ 181 #define RTF_PROTO2 0x4000 /* protocol specific routing flag */ 182 #define RTF_PROTO1 0x8000 /* protocol specific routing flag */ 183 /* 0x10000 unused, was RTF_PRCLONING */ 184 /* 0x20000 unused, was RTF_WASCLONED */ 185 #define RTF_PROTO3 0x40000 /* protocol specific routing flag */ 186 #define RTF_FIXEDMTU 0x80000 /* MTU was explicitly specified */ 187 #define RTF_PINNED 0x100000 /* route is immutable */ 188 #define RTF_LOCAL 0x200000 /* route represents a local address */ 189 #define RTF_BROADCAST 0x400000 /* route represents a bcast address */ 190 #define RTF_MULTICAST 0x800000 /* route represents a mcast address */ 191 /* 0x8000000 and up unassigned */ 192 #define RTF_STICKY 0x10000000 /* always route dst->src */ 193 194 /* 0x40000000 unused, was RTF_RNH_LOCKED */ 195 196 #define RTF_GWFLAG_COMPAT 0x80000000 /* a compatibility bit for interacting 197 with existing routing apps */ 198 199 /* Mask of RTF flags that are allowed to be modified by RTM_CHANGE. */ 200 #define RTF_FMASK \ 201 (RTF_PROTO1 | RTF_PROTO2 | RTF_PROTO3 | RTF_BLACKHOLE | \ 202 RTF_REJECT | RTF_STATIC | RTF_STICKY) 203 204 /* 205 * fib_ nexthop API flags. 206 */ 207 208 /* Consumer-visible nexthop info flags */ 209 #define NHF_MULTIPATH 0x0008 /* Nexhop is a nexthop group */ 210 #define NHF_REJECT 0x0010 /* RTF_REJECT */ 211 #define NHF_BLACKHOLE 0x0020 /* RTF_BLACKHOLE */ 212 #define NHF_REDIRECT 0x0040 /* RTF_DYNAMIC|RTF_MODIFIED */ 213 #define NHF_DEFAULT 0x0080 /* Default route */ 214 #define NHF_BROADCAST 0x0100 /* RTF_BROADCAST */ 215 #define NHF_GATEWAY 0x0200 /* RTF_GATEWAY */ 216 #define NHF_HOST 0x0400 /* RTF_HOST */ 217 218 /* Nexthop request flags */ 219 #define NHR_NONE 0x00 /* empty flags field */ 220 #define NHR_REF 0x01 /* reference nexhop */ 221 #define NHR_NODEFAULT 0x02 /* uRPF: do not consider default route */ 222 223 /* Control plane route request flags */ 224 #define NHR_COPY 0x100 /* Copy rte data */ 225 #define NHR_UNLOCKED 0x200 /* Do not lock table */ 226 227 /* 228 * Routing statistics. 229 */ 230 struct rtstat { 231 uint64_t rts_badredirect; /* bogus redirect calls */ 232 uint64_t rts_dynamic; /* routes created by redirects */ 233 uint64_t rts_newgateway; /* routes modified by redirects */ 234 uint64_t rts_unreach; /* lookups which failed */ 235 uint64_t rts_wildcard; /* lookups satisfied by a wildcard */ 236 uint64_t rts_nh_idx_alloc_failure; /* nexthop index alloc failure*/ 237 uint64_t rts_nh_alloc_failure; /* nexthop allocation failure*/ 238 uint64_t rts_add_failure; /* # of route addition failures */ 239 uint64_t rts_add_retry; /* # of route addition retries */ 240 uint64_t rts_del_failure; /* # of route deletion failure */ 241 uint64_t rts_del_retry; /* # of route deletion retries */ 242 }; 243 244 /* 245 * Structures for routing messages. 246 */ 247 struct rt_msghdr { 248 u_short rtm_msglen; /* to skip over non-understood messages */ 249 u_char rtm_version; /* future binary compatibility */ 250 u_char rtm_type; /* message type */ 251 u_short rtm_index; /* index for associated ifp */ 252 u_short _rtm_spare1; 253 int rtm_flags; /* flags, incl. kern & message, e.g. DONE */ 254 int rtm_addrs; /* bitmask identifying sockaddrs in msg */ 255 pid_t rtm_pid; /* identify sender */ 256 int rtm_seq; /* for sender to identify action */ 257 int rtm_errno; /* why failed */ 258 int rtm_fmask; /* bitmask used in RTM_CHANGE message */ 259 u_long rtm_inits; /* which metrics we are initializing */ 260 struct rt_metrics rtm_rmx; /* metrics themselves */ 261 }; 262 263 #define RTM_VERSION 5 /* Up the ante and ignore older versions */ 264 265 #ifndef NETLINK_COMPAT 266 /* 267 * Message types. 268 * 269 * The format for each message is annotated below using the following 270 * identifiers: 271 * 272 * (1) struct rt_msghdr 273 * (2) struct ifa_msghdr 274 * (3) struct if_msghdr 275 * (4) struct ifma_msghdr 276 * (5) struct if_announcemsghdr 277 * 278 */ 279 #define RTM_ADD 0x1 /* (1) Add Route */ 280 #define RTM_DELETE 0x2 /* (1) Delete Route */ 281 #define RTM_CHANGE 0x3 /* (1) Change Metrics or flags */ 282 #define RTM_GET 0x4 /* (1) Report Metrics */ 283 #define RTM_LOSING 0x5 /* (1) Kernel Suspects Partitioning */ 284 #define RTM_REDIRECT 0x6 /* (1) Told to use different route */ 285 #define RTM_MISS 0x7 /* (1) Lookup failed on this address */ 286 #define RTM_LOCK 0x8 /* (1) fix specified metrics */ 287 /* 0x9 */ 288 /* 0xa */ 289 #define RTM_RESOLVE 0xb /* (1) req to resolve dst to LL addr */ 290 #define RTM_NEWADDR 0xc /* (2) address being added to iface */ 291 #define RTM_DELADDR 0xd /* (2) address being removed from iface */ 292 #define RTM_IFINFO 0xe /* (3) iface going up/down etc. */ 293 #define RTM_NEWMADDR 0xf /* (4) mcast group membership being added to if */ 294 #define RTM_DELMADDR 0x10 /* (4) mcast group membership being deleted */ 295 #define RTM_IFANNOUNCE 0x11 /* (5) iface arrival/departure */ 296 #define RTM_IEEE80211 0x12 /* (5) IEEE80211 wireless event */ 297 298 #endif /* NETLINK_COMPAT*/ 299 300 /* 301 * Bitmask values for rtm_inits and rmx_locks. 302 */ 303 #define RTV_MTU 0x1 /* init or lock _mtu */ 304 #define RTV_HOPCOUNT 0x2 /* init or lock _hopcount */ 305 #define RTV_EXPIRE 0x4 /* init or lock _expire */ 306 #define RTV_RPIPE 0x8 /* init or lock _recvpipe */ 307 #define RTV_SPIPE 0x10 /* init or lock _sendpipe */ 308 #define RTV_SSTHRESH 0x20 /* init or lock _ssthresh */ 309 #define RTV_RTT 0x40 /* init or lock _rtt */ 310 #define RTV_RTTVAR 0x80 /* init or lock _rttvar */ 311 #define RTV_WEIGHT 0x100 /* init or lock _weight */ 312 313 #ifndef NETLINK_COMPAT 314 315 /* 316 * Bitmask values for rtm_addrs. 317 */ 318 #define RTA_DST 0x1 /* destination sockaddr present */ 319 #define RTA_GATEWAY 0x2 /* gateway sockaddr present */ 320 #define RTA_NETMASK 0x4 /* netmask sockaddr present */ 321 #define RTA_GENMASK 0x8 /* cloning mask sockaddr present */ 322 #define RTA_IFP 0x10 /* interface name sockaddr present */ 323 #define RTA_IFA 0x20 /* interface addr sockaddr present */ 324 #define RTA_AUTHOR 0x40 /* sockaddr for author of redirect */ 325 #define RTA_BRD 0x80 /* for NEWADDR, broadcast or p-p dest addr */ 326 327 #endif /* NETLINK_COMPAT*/ 328 329 /* 330 * Index offsets for sockaddr array for alternate internal encoding. 331 */ 332 #define RTAX_DST 0 /* destination sockaddr present */ 333 #define RTAX_GATEWAY 1 /* gateway sockaddr present */ 334 #define RTAX_NETMASK 2 /* netmask sockaddr present */ 335 #define RTAX_GENMASK 3 /* cloning mask sockaddr present */ 336 #define RTAX_IFP 4 /* interface name sockaddr present */ 337 #define RTAX_IFA 5 /* interface addr sockaddr present */ 338 #define RTAX_AUTHOR 6 /* sockaddr for author of redirect */ 339 #define RTAX_BRD 7 /* for NEWADDR, broadcast or p-p dest addr */ 340 #define RTAX_MAX 8 /* size of array to allocate */ 341 342 struct rtentry; 343 struct nhop_object; 344 typedef int rib_filter_f_t(const struct rtentry *, const struct nhop_object *, 345 void *); 346 347 struct rt_addrinfo { 348 int rti_addrs; /* Route RTF_ flags */ 349 int rti_flags; /* Route RTF_ flags */ 350 struct sockaddr *rti_info[RTAX_MAX]; /* Sockaddr data */ 351 struct ifaddr *rti_ifa; /* value of rt_ifa addr */ 352 struct ifnet *rti_ifp; /* route interface */ 353 rib_filter_f_t *rti_filter; /* filter function */ 354 void *rti_filterdata; /* filter parameters */ 355 u_long rti_mflags; /* metrics RTV_ flags */ 356 u_long rti_spare; /* Will be used for fib */ 357 struct rt_metrics *rti_rmx; /* Pointer to route metrics */ 358 }; 359 360 /* 361 * This macro returns the size of a struct sockaddr when passed 362 * through a routing socket. Basically we round up sa_len to 363 * a multiple of sizeof(long), with a minimum of sizeof(long). 364 * The case sa_len == 0 should only apply to empty structures. 365 */ 366 #define SA_SIZE(sa) \ 367 ( (((struct sockaddr *)(sa))->sa_len == 0) ? \ 368 sizeof(long) : \ 369 1 + ( (((struct sockaddr *)(sa))->sa_len - 1) | (sizeof(long) - 1) ) ) 370 371 #define sa_equal(a, b) ( \ 372 (((const struct sockaddr *)(a))->sa_len == ((const struct sockaddr *)(b))->sa_len) && \ 373 (bcmp((a), (b), ((const struct sockaddr *)(b))->sa_len) == 0)) 374 375 #ifdef _KERNEL 376 377 #define RT_LINK_IS_UP(ifp) (!((ifp)->if_capabilities & IFCAP_LINKSTATE) \ 378 || (ifp)->if_link_state == LINK_STATE_UP) 379 380 #define RO_NHFREE(_ro) do { \ 381 if ((_ro)->ro_nh) { \ 382 NH_FREE((_ro)->ro_nh); \ 383 (_ro)->ro_nh = NULL; \ 384 } \ 385 } while (0) 386 387 #define RO_INVALIDATE_CACHE(ro) do { \ 388 if ((ro)->ro_lle != NULL) { \ 389 LLE_FREE((ro)->ro_lle); \ 390 (ro)->ro_lle = NULL; \ 391 } \ 392 if ((ro)->ro_nh != NULL) { \ 393 NH_FREE((ro)->ro_nh); \ 394 (ro)->ro_nh = NULL; \ 395 } \ 396 } while (0) 397 398 #define RO_GET_FAMILY(ro, dst) ((ro) != NULL && \ 399 (ro)->ro_flags & RT_HAS_GW \ 400 ? (ro)->ro_dst.sa_family : (dst)->sa_family) 401 402 /* 403 * Validate a cached route based on a supplied cookie. If there is an 404 * out-of-date cache, simply free it. Update the generation number 405 * for the new allocation 406 */ 407 #define NH_VALIDATE(ro, cookiep, fibnum) do { \ 408 rt_gen_t cookie = RT_GEN(fibnum, (ro)->ro_dst.sa_family); \ 409 if (*(cookiep) != cookie) { \ 410 RO_INVALIDATE_CACHE(ro); \ 411 *(cookiep) = cookie; \ 412 } \ 413 } while (0) 414 415 struct ifmultiaddr; 416 struct rib_head; 417 418 void rt_ieee80211msg(struct ifnet *, int, void *, size_t); 419 void rt_ifmsg(struct ifnet *, int); 420 void rt_missmsg(int, struct rt_addrinfo *, int, int); 421 void rt_missmsg_fib(int, struct rt_addrinfo *, int, int, int); 422 int rt_addrmsg(int, struct ifaddr *, int); 423 int rt_routemsg(int, struct rtentry *, struct nhop_object *, int); 424 int rt_routemsg_info(int, struct rt_addrinfo *, int); 425 void rt_newmaddrmsg(int, struct ifmultiaddr *); 426 void rt_maskedcopy(const struct sockaddr *, struct sockaddr *, 427 const struct sockaddr *); 428 struct rib_head *rt_table_init(int, int, u_int); 429 void rt_table_destroy(struct rib_head *); 430 u_int rt_tables_get_gen(uint32_t table, sa_family_t family); 431 432 struct sockaddr *rtsock_fix_netmask(const struct sockaddr *dst, 433 const struct sockaddr *smask, struct sockaddr_storage *dmask); 434 435 void rt_updatemtu(struct ifnet *); 436 437 void rt_flushifroutes(struct ifnet *ifp); 438 439 /* XXX MRT NEW VERSIONS THAT USE FIBs 440 * For now the protocol indepedent versions are the same as the AF_INET ones 441 * but this will change.. 442 */ 443 int rtioctl_fib(u_long, caddr_t, u_int); 444 445 /* New API */ 446 void rib_flush_routes_family(int family); 447 struct nhop_object *rib_lookup(uint32_t fibnum, const struct sockaddr *dst, 448 uint32_t flags, uint32_t flowid); 449 const char *rib_print_family(int family); 450 #endif 451 452 #endif 453