1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* 3 * INET An implementation of the TCP/IP protocol suite for the LINUX 4 * operating system. INET is implemented using the BSD Socket 5 * interface as the means of communication with the user level. 6 * 7 * Definitions for the Forwarding Information Base. 8 * 9 * Authors: A.N.Kuznetsov, <kuznet@ms2.inr.ac.ru> 10 */ 11 12 #ifndef _NET_IP_FIB_H 13 #define _NET_IP_FIB_H 14 15 #include <net/flow.h> 16 #include <linux/seq_file.h> 17 #include <linux/rcupdate.h> 18 #include <net/fib_notifier.h> 19 #include <net/fib_rules.h> 20 #include <net/inet_dscp.h> 21 #include <net/inetpeer.h> 22 #include <linux/percpu.h> 23 #include <linux/notifier.h> 24 #include <linux/refcount.h> 25 #include <linux/ip.h> 26 #include <linux/in_route.h> 27 28 struct fib_config { 29 u8 fc_dst_len; 30 dscp_t fc_dscp; 31 u8 fc_protocol; 32 u8 fc_scope; 33 u8 fc_type; 34 u8 fc_gw_family; 35 /* 2 bytes unused */ 36 u32 fc_table; 37 __be32 fc_dst; 38 union { 39 __be32 fc_gw4; 40 struct in6_addr fc_gw6; 41 }; 42 int fc_oif; 43 u32 fc_flags; 44 u32 fc_priority; 45 __be32 fc_prefsrc; 46 u32 fc_nh_id; 47 struct nlattr *fc_mx; 48 struct rtnexthop *fc_mp; 49 int fc_mx_len; 50 int fc_mp_len; 51 u32 fc_flow; 52 u32 fc_nlflags; 53 struct nl_info fc_nlinfo; 54 struct nlattr *fc_encap; 55 u16 fc_encap_type; 56 }; 57 58 struct fib_info; 59 struct rtable; 60 61 struct fib_nh_exception { 62 struct fib_nh_exception __rcu *fnhe_next; 63 int fnhe_genid; 64 __be32 fnhe_daddr; 65 u32 fnhe_pmtu; 66 bool fnhe_mtu_locked; 67 __be32 fnhe_gw; 68 unsigned long fnhe_expires; 69 struct rtable __rcu *fnhe_rth_input; 70 struct rtable __rcu *fnhe_rth_output; 71 unsigned long fnhe_stamp; 72 struct rcu_head rcu; 73 }; 74 75 struct fnhe_hash_bucket { 76 struct fib_nh_exception __rcu *chain; 77 }; 78 79 #define FNHE_HASH_SHIFT 11 80 #define FNHE_HASH_SIZE (1 << FNHE_HASH_SHIFT) 81 #define FNHE_RECLAIM_DEPTH 5 82 83 struct fib_nh_common { 84 struct net_device *nhc_dev; 85 netdevice_tracker nhc_dev_tracker; 86 int nhc_oif; 87 unsigned char nhc_scope; 88 u8 nhc_family; 89 u8 nhc_gw_family; 90 unsigned char nhc_flags; 91 struct lwtunnel_state *nhc_lwtstate; 92 93 union { 94 __be32 ipv4; 95 struct in6_addr ipv6; 96 } nhc_gw; 97 98 int nhc_weight; 99 atomic_t nhc_upper_bound; 100 101 /* v4 specific, but allows fib6_nh with v4 routes */ 102 struct rtable __rcu * __percpu *nhc_pcpu_rth_output; 103 struct rtable __rcu *nhc_rth_input; 104 struct fnhe_hash_bucket __rcu *nhc_exceptions; 105 }; 106 107 struct fib_nh { 108 struct fib_nh_common nh_common; 109 struct hlist_node nh_hash; 110 struct fib_info *nh_parent; 111 #ifdef CONFIG_IP_ROUTE_CLASSID 112 __u32 nh_tclassid; 113 #endif 114 __be32 nh_saddr; 115 int nh_saddr_genid; 116 #define fib_nh_family nh_common.nhc_family 117 #define fib_nh_dev nh_common.nhc_dev 118 #define fib_nh_dev_tracker nh_common.nhc_dev_tracker 119 #define fib_nh_oif nh_common.nhc_oif 120 #define fib_nh_flags nh_common.nhc_flags 121 #define fib_nh_lws nh_common.nhc_lwtstate 122 #define fib_nh_scope nh_common.nhc_scope 123 #define fib_nh_gw_family nh_common.nhc_gw_family 124 #define fib_nh_gw4 nh_common.nhc_gw.ipv4 125 #define fib_nh_gw6 nh_common.nhc_gw.ipv6 126 #define fib_nh_weight nh_common.nhc_weight 127 #define fib_nh_upper_bound nh_common.nhc_upper_bound 128 }; 129 130 /* 131 * This structure contains data shared by many of routes. 132 */ 133 134 struct nexthop; 135 136 struct fib_info { 137 struct hlist_node fib_hash; 138 struct hlist_node fib_lhash; 139 struct list_head nh_list; 140 struct net *fib_net; 141 refcount_t fib_treeref; 142 refcount_t fib_clntref; 143 unsigned int fib_flags; 144 unsigned char fib_dead; 145 unsigned char fib_protocol; 146 unsigned char fib_scope; 147 unsigned char fib_type; 148 __be32 fib_prefsrc; 149 u32 fib_tb_id; 150 u32 fib_priority; 151 struct dst_metrics *fib_metrics; 152 #define fib_mtu fib_metrics->metrics[RTAX_MTU-1] 153 #define fib_window fib_metrics->metrics[RTAX_WINDOW-1] 154 #define fib_rtt fib_metrics->metrics[RTAX_RTT-1] 155 #define fib_advmss fib_metrics->metrics[RTAX_ADVMSS-1] 156 int fib_nhs; 157 bool fib_nh_is_v6; 158 bool nh_updated; 159 bool pfsrc_removed; 160 struct nexthop *nh; 161 struct rcu_head rcu; 162 struct fib_nh fib_nh[] __counted_by(fib_nhs); 163 }; 164 165 166 #ifdef CONFIG_IP_MULTIPLE_TABLES 167 struct fib_rule; 168 #endif 169 170 struct fib_table; 171 struct fib_result { 172 __be32 prefix; 173 unsigned char prefixlen; 174 unsigned char nh_sel; 175 unsigned char type; 176 unsigned char scope; 177 u32 tclassid; 178 dscp_t dscp; 179 struct fib_nh_common *nhc; 180 struct fib_info *fi; 181 struct fib_table *table; 182 struct hlist_head *fa_head; 183 }; 184 185 struct fib_result_nl { 186 __be32 fl_addr; /* To be looked up*/ 187 u32 fl_mark; 188 unsigned char fl_tos; 189 unsigned char fl_scope; 190 unsigned char tb_id_in; 191 192 unsigned char tb_id; /* Results */ 193 unsigned char prefixlen; 194 unsigned char nh_sel; 195 unsigned char type; 196 unsigned char scope; 197 int err; 198 }; 199 200 #ifdef CONFIG_IP_MULTIPLE_TABLES 201 #define FIB_TABLE_HASHSZ 256 202 #else 203 #define FIB_TABLE_HASHSZ 2 204 #endif 205 206 __be32 fib_info_update_nhc_saddr(struct net *net, struct fib_nh_common *nhc, 207 unsigned char scope); 208 __be32 fib_result_prefsrc(struct net *net, struct fib_result *res); 209 210 #define FIB_RES_NHC(res) ((res).nhc) 211 #define FIB_RES_DEV(res) (FIB_RES_NHC(res)->nhc_dev) 212 #define FIB_RES_OIF(res) (FIB_RES_NHC(res)->nhc_oif) 213 214 struct fib_rt_info { 215 struct fib_info *fi; 216 u32 tb_id; 217 __be32 dst; 218 int dst_len; 219 dscp_t dscp; 220 u8 type; 221 u8 offload:1, 222 trap:1, 223 offload_failed:1, 224 unused:5; 225 }; 226 227 struct fib_entry_notifier_info { 228 struct fib_notifier_info info; /* must be first */ 229 u32 dst; 230 int dst_len; 231 struct fib_info *fi; 232 dscp_t dscp; 233 u8 type; 234 u32 tb_id; 235 }; 236 237 struct fib_nh_notifier_info { 238 struct fib_notifier_info info; /* must be first */ 239 struct fib_nh *fib_nh; 240 }; 241 242 int call_fib4_notifier(struct notifier_block *nb, 243 enum fib_event_type event_type, 244 struct fib_notifier_info *info); 245 int call_fib4_notifiers(struct net *net, enum fib_event_type event_type, 246 struct fib_notifier_info *info); 247 248 int __net_init fib4_notifier_init(struct net *net); 249 void __net_exit fib4_notifier_exit(struct net *net); 250 251 void fib_info_notify_update(struct net *net, struct nl_info *info); 252 int fib_notify(struct net *net, struct notifier_block *nb, 253 struct netlink_ext_ack *extack); 254 255 struct fib_table { 256 struct hlist_node tb_hlist; 257 u32 tb_id; 258 int tb_num_default; 259 struct rcu_head rcu; 260 unsigned long *tb_data; 261 unsigned long __data[]; 262 }; 263 264 struct fib_dump_filter { 265 u32 table_id; 266 /* filter_set is an optimization that an entry is set */ 267 bool filter_set; 268 bool dump_routes; 269 bool dump_exceptions; 270 bool rtnl_held; 271 unsigned char protocol; 272 unsigned char rt_type; 273 unsigned int flags; 274 struct net_device *dev; 275 }; 276 277 int fib_table_lookup(struct fib_table *tb, const struct flowi4 *flp, 278 struct fib_result *res, int fib_flags); 279 int fib_table_insert(struct net *, struct fib_table *, struct fib_config *, 280 struct netlink_ext_ack *extack); 281 int fib_table_delete(struct net *, struct fib_table *, struct fib_config *, 282 struct netlink_ext_ack *extack); 283 int fib_table_dump(struct fib_table *table, struct sk_buff *skb, 284 struct netlink_callback *cb, struct fib_dump_filter *filter); 285 int fib_table_flush(struct net *net, struct fib_table *table, bool flush_all); 286 struct fib_table *fib_trie_unmerge(struct fib_table *main_tb); 287 void fib_table_flush_external(struct fib_table *table); 288 void fib_free_table(struct fib_table *tb); 289 290 #ifndef CONFIG_IP_MULTIPLE_TABLES 291 292 #define TABLE_LOCAL_INDEX (RT_TABLE_LOCAL & (FIB_TABLE_HASHSZ - 1)) 293 #define TABLE_MAIN_INDEX (RT_TABLE_MAIN & (FIB_TABLE_HASHSZ - 1)) 294 fib_get_table(struct net * net,u32 id)295 static inline struct fib_table *fib_get_table(struct net *net, u32 id) 296 { 297 struct hlist_node *tb_hlist; 298 struct hlist_head *ptr; 299 300 ptr = id == RT_TABLE_LOCAL ? 301 &net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX] : 302 &net->ipv4.fib_table_hash[TABLE_MAIN_INDEX]; 303 304 tb_hlist = rcu_dereference_rtnl(hlist_first_rcu(ptr)); 305 306 return hlist_entry(tb_hlist, struct fib_table, tb_hlist); 307 } 308 fib_new_table(struct net * net,u32 id)309 static inline struct fib_table *fib_new_table(struct net *net, u32 id) 310 { 311 return fib_get_table(net, id); 312 } 313 fib_lookup(struct net * net,const struct flowi4 * flp,struct fib_result * res,unsigned int flags)314 static inline int fib_lookup(struct net *net, const struct flowi4 *flp, 315 struct fib_result *res, unsigned int flags) 316 { 317 struct fib_table *tb; 318 int err = -ENETUNREACH; 319 320 rcu_read_lock(); 321 322 tb = fib_get_table(net, RT_TABLE_MAIN); 323 if (tb) 324 err = fib_table_lookup(tb, flp, res, flags | FIB_LOOKUP_NOREF); 325 326 if (err == -EAGAIN) 327 err = -ENETUNREACH; 328 329 rcu_read_unlock(); 330 331 return err; 332 } 333 fib4_has_custom_rules(const struct net * net)334 static inline bool fib4_has_custom_rules(const struct net *net) 335 { 336 return false; 337 } 338 fib4_rule_default(const struct fib_rule * rule)339 static inline bool fib4_rule_default(const struct fib_rule *rule) 340 { 341 return true; 342 } 343 fib4_rules_dump(struct net * net,struct notifier_block * nb,struct netlink_ext_ack * extack)344 static inline int fib4_rules_dump(struct net *net, struct notifier_block *nb, 345 struct netlink_ext_ack *extack) 346 { 347 return 0; 348 } 349 fib4_rules_seq_read(struct net * net)350 static inline unsigned int fib4_rules_seq_read(struct net *net) 351 { 352 return 0; 353 } 354 fib4_rules_early_flow_dissect(struct net * net,struct sk_buff * skb,struct flowi4 * fl4,struct flow_keys * flkeys)355 static inline bool fib4_rules_early_flow_dissect(struct net *net, 356 struct sk_buff *skb, 357 struct flowi4 *fl4, 358 struct flow_keys *flkeys) 359 { 360 return false; 361 } 362 #else /* CONFIG_IP_MULTIPLE_TABLES */ 363 int __net_init fib4_rules_init(struct net *net); 364 void __net_exit fib4_rules_exit(struct net *net); 365 366 struct fib_table *fib_new_table(struct net *net, u32 id); 367 struct fib_table *fib_get_table(struct net *net, u32 id); 368 369 int __fib_lookup(struct net *net, struct flowi4 *flp, 370 struct fib_result *res, unsigned int flags); 371 fib_lookup(struct net * net,struct flowi4 * flp,struct fib_result * res,unsigned int flags)372 static inline int fib_lookup(struct net *net, struct flowi4 *flp, 373 struct fib_result *res, unsigned int flags) 374 { 375 struct fib_table *tb; 376 int err = -ENETUNREACH; 377 378 flags |= FIB_LOOKUP_NOREF; 379 if (net->ipv4.fib_has_custom_rules) 380 return __fib_lookup(net, flp, res, flags); 381 382 rcu_read_lock(); 383 384 res->tclassid = 0; 385 386 tb = rcu_dereference_rtnl(net->ipv4.fib_main); 387 if (tb) 388 err = fib_table_lookup(tb, flp, res, flags); 389 390 if (!err) 391 goto out; 392 393 tb = rcu_dereference_rtnl(net->ipv4.fib_default); 394 if (tb) 395 err = fib_table_lookup(tb, flp, res, flags); 396 397 out: 398 if (err == -EAGAIN) 399 err = -ENETUNREACH; 400 401 rcu_read_unlock(); 402 403 return err; 404 } 405 fib4_has_custom_rules(const struct net * net)406 static inline bool fib4_has_custom_rules(const struct net *net) 407 { 408 return net->ipv4.fib_has_custom_rules; 409 } 410 411 bool fib4_rule_default(const struct fib_rule *rule); 412 int fib4_rules_dump(struct net *net, struct notifier_block *nb, 413 struct netlink_ext_ack *extack); 414 unsigned int fib4_rules_seq_read(struct net *net); 415 fib4_rules_early_flow_dissect(struct net * net,struct sk_buff * skb,struct flowi4 * fl4,struct flow_keys * flkeys)416 static inline bool fib4_rules_early_flow_dissect(struct net *net, 417 struct sk_buff *skb, 418 struct flowi4 *fl4, 419 struct flow_keys *flkeys) 420 { 421 unsigned int flag = FLOW_DISSECTOR_F_STOP_AT_ENCAP; 422 423 if (!net->ipv4.fib_rules_require_fldissect) 424 return false; 425 426 memset(flkeys, 0, sizeof(*flkeys)); 427 __skb_flow_dissect(net, skb, &flow_keys_dissector, 428 flkeys, NULL, 0, 0, 0, flag); 429 430 fl4->fl4_sport = flkeys->ports.src; 431 fl4->fl4_dport = flkeys->ports.dst; 432 fl4->flowi4_proto = flkeys->basic.ip_proto; 433 434 return true; 435 } 436 437 #endif /* CONFIG_IP_MULTIPLE_TABLES */ 438 fib_dscp_masked_match(dscp_t dscp,const struct flowi4 * fl4)439 static inline bool fib_dscp_masked_match(dscp_t dscp, const struct flowi4 *fl4) 440 { 441 return dscp == inet_dsfield_to_dscp(RT_TOS(fl4->flowi4_tos)); 442 } 443 444 /* Exported by fib_frontend.c */ 445 extern const struct nla_policy rtm_ipv4_policy[]; 446 void ip_fib_init(void); 447 int fib_gw_from_via(struct fib_config *cfg, struct nlattr *nla, 448 struct netlink_ext_ack *extack); 449 __be32 fib_compute_spec_dst(struct sk_buff *skb); 450 bool fib_info_nh_uses_dev(struct fib_info *fi, const struct net_device *dev); 451 int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst, 452 u8 tos, int oif, struct net_device *dev, 453 struct in_device *idev, u32 *itag); 454 #ifdef CONFIG_IP_ROUTE_CLASSID fib_num_tclassid_users(struct net * net)455 static inline int fib_num_tclassid_users(struct net *net) 456 { 457 return atomic_read(&net->ipv4.fib_num_tclassid_users); 458 } 459 #else fib_num_tclassid_users(struct net * net)460 static inline int fib_num_tclassid_users(struct net *net) 461 { 462 return 0; 463 } 464 #endif 465 int fib_unmerge(struct net *net); 466 nhc_l3mdev_matches_dev(const struct fib_nh_common * nhc,const struct net_device * dev)467 static inline bool nhc_l3mdev_matches_dev(const struct fib_nh_common *nhc, 468 const struct net_device *dev) 469 { 470 if (nhc->nhc_dev == dev || 471 l3mdev_master_ifindex_rcu(nhc->nhc_dev) == dev->ifindex) 472 return true; 473 474 return false; 475 } 476 477 /* Exported by fib_semantics.c */ 478 int ip_fib_check_default(__be32 gw, struct net_device *dev); 479 int fib_sync_down_dev(struct net_device *dev, unsigned long event, bool force); 480 int fib_sync_down_addr(struct net_device *dev, __be32 local); 481 int fib_sync_up(struct net_device *dev, unsigned char nh_flags); 482 void fib_sync_mtu(struct net_device *dev, u32 orig_mtu); 483 void fib_nhc_update_mtu(struct fib_nh_common *nhc, u32 new, u32 orig); 484 485 /* Fields used for sysctl_fib_multipath_hash_fields. 486 * Common to IPv4 and IPv6. 487 * 488 * Add new fields at the end. This is user API. 489 */ 490 #define FIB_MULTIPATH_HASH_FIELD_SRC_IP BIT(0) 491 #define FIB_MULTIPATH_HASH_FIELD_DST_IP BIT(1) 492 #define FIB_MULTIPATH_HASH_FIELD_IP_PROTO BIT(2) 493 #define FIB_MULTIPATH_HASH_FIELD_FLOWLABEL BIT(3) 494 #define FIB_MULTIPATH_HASH_FIELD_SRC_PORT BIT(4) 495 #define FIB_MULTIPATH_HASH_FIELD_DST_PORT BIT(5) 496 #define FIB_MULTIPATH_HASH_FIELD_INNER_SRC_IP BIT(6) 497 #define FIB_MULTIPATH_HASH_FIELD_INNER_DST_IP BIT(7) 498 #define FIB_MULTIPATH_HASH_FIELD_INNER_IP_PROTO BIT(8) 499 #define FIB_MULTIPATH_HASH_FIELD_INNER_FLOWLABEL BIT(9) 500 #define FIB_MULTIPATH_HASH_FIELD_INNER_SRC_PORT BIT(10) 501 #define FIB_MULTIPATH_HASH_FIELD_INNER_DST_PORT BIT(11) 502 503 #define FIB_MULTIPATH_HASH_FIELD_OUTER_MASK \ 504 (FIB_MULTIPATH_HASH_FIELD_SRC_IP | \ 505 FIB_MULTIPATH_HASH_FIELD_DST_IP | \ 506 FIB_MULTIPATH_HASH_FIELD_IP_PROTO | \ 507 FIB_MULTIPATH_HASH_FIELD_FLOWLABEL | \ 508 FIB_MULTIPATH_HASH_FIELD_SRC_PORT | \ 509 FIB_MULTIPATH_HASH_FIELD_DST_PORT) 510 511 #define FIB_MULTIPATH_HASH_FIELD_INNER_MASK \ 512 (FIB_MULTIPATH_HASH_FIELD_INNER_SRC_IP | \ 513 FIB_MULTIPATH_HASH_FIELD_INNER_DST_IP | \ 514 FIB_MULTIPATH_HASH_FIELD_INNER_IP_PROTO | \ 515 FIB_MULTIPATH_HASH_FIELD_INNER_FLOWLABEL | \ 516 FIB_MULTIPATH_HASH_FIELD_INNER_SRC_PORT | \ 517 FIB_MULTIPATH_HASH_FIELD_INNER_DST_PORT) 518 519 #define FIB_MULTIPATH_HASH_FIELD_ALL_MASK \ 520 (FIB_MULTIPATH_HASH_FIELD_OUTER_MASK | \ 521 FIB_MULTIPATH_HASH_FIELD_INNER_MASK) 522 523 #define FIB_MULTIPATH_HASH_FIELD_DEFAULT_MASK \ 524 (FIB_MULTIPATH_HASH_FIELD_SRC_IP | \ 525 FIB_MULTIPATH_HASH_FIELD_DST_IP | \ 526 FIB_MULTIPATH_HASH_FIELD_IP_PROTO) 527 528 #ifdef CONFIG_IP_ROUTE_MULTIPATH 529 int fib_multipath_hash(const struct net *net, const struct flowi4 *fl4, 530 const struct sk_buff *skb, struct flow_keys *flkeys); 531 532 static void fib_multipath_hash_construct_key(siphash_key_t * key,u32 mp_seed)533 fib_multipath_hash_construct_key(siphash_key_t *key, u32 mp_seed) 534 { 535 u64 mp_seed_64 = mp_seed; 536 537 key->key[0] = (mp_seed_64 << 32) | mp_seed_64; 538 key->key[1] = key->key[0]; 539 } 540 fib_multipath_hash_from_keys(const struct net * net,struct flow_keys * keys)541 static inline u32 fib_multipath_hash_from_keys(const struct net *net, 542 struct flow_keys *keys) 543 { 544 siphash_aligned_key_t hash_key; 545 u32 mp_seed; 546 547 mp_seed = READ_ONCE(net->ipv4.sysctl_fib_multipath_hash_seed).mp_seed; 548 fib_multipath_hash_construct_key(&hash_key, mp_seed); 549 550 return flow_hash_from_keys_seed(keys, &hash_key); 551 } 552 #else fib_multipath_hash_from_keys(const struct net * net,struct flow_keys * keys)553 static inline u32 fib_multipath_hash_from_keys(const struct net *net, 554 struct flow_keys *keys) 555 { 556 return flow_hash_from_keys(keys); 557 } 558 #endif 559 560 int fib_check_nh(struct net *net, struct fib_nh *nh, u32 table, u8 scope, 561 struct netlink_ext_ack *extack); 562 void fib_select_multipath(struct fib_result *res, int hash); 563 void fib_select_path(struct net *net, struct fib_result *res, 564 struct flowi4 *fl4, const struct sk_buff *skb); 565 566 int fib_nh_init(struct net *net, struct fib_nh *fib_nh, 567 struct fib_config *cfg, int nh_weight, 568 struct netlink_ext_ack *extack); 569 void fib_nh_release(struct net *net, struct fib_nh *fib_nh); 570 int fib_nh_common_init(struct net *net, struct fib_nh_common *nhc, 571 struct nlattr *fc_encap, u16 fc_encap_type, 572 void *cfg, gfp_t gfp_flags, 573 struct netlink_ext_ack *extack); 574 void fib_nh_common_release(struct fib_nh_common *nhc); 575 576 /* Exported by fib_trie.c */ 577 void fib_alias_hw_flags_set(struct net *net, const struct fib_rt_info *fri); 578 void fib_trie_init(void); 579 struct fib_table *fib_trie_table(u32 id, struct fib_table *alias); 580 bool fib_lookup_good_nhc(const struct fib_nh_common *nhc, int fib_flags, 581 const struct flowi4 *flp); 582 fib_combine_itag(u32 * itag,const struct fib_result * res)583 static inline void fib_combine_itag(u32 *itag, const struct fib_result *res) 584 { 585 #ifdef CONFIG_IP_ROUTE_CLASSID 586 struct fib_nh_common *nhc = res->nhc; 587 #ifdef CONFIG_IP_MULTIPLE_TABLES 588 u32 rtag; 589 #endif 590 if (nhc->nhc_family == AF_INET) { 591 struct fib_nh *nh; 592 593 nh = container_of(nhc, struct fib_nh, nh_common); 594 *itag = nh->nh_tclassid << 16; 595 } else { 596 *itag = 0; 597 } 598 599 #ifdef CONFIG_IP_MULTIPLE_TABLES 600 rtag = res->tclassid; 601 if (*itag == 0) 602 *itag = (rtag<<16); 603 *itag |= (rtag>>16); 604 #endif 605 #endif 606 } 607 608 void fib_flush(struct net *net); 609 void free_fib_info(struct fib_info *fi); 610 fib_info_hold(struct fib_info * fi)611 static inline void fib_info_hold(struct fib_info *fi) 612 { 613 refcount_inc(&fi->fib_clntref); 614 } 615 fib_info_put(struct fib_info * fi)616 static inline void fib_info_put(struct fib_info *fi) 617 { 618 if (refcount_dec_and_test(&fi->fib_clntref)) 619 free_fib_info(fi); 620 } 621 622 #ifdef CONFIG_PROC_FS 623 int __net_init fib_proc_init(struct net *net); 624 void __net_exit fib_proc_exit(struct net *net); 625 #else fib_proc_init(struct net * net)626 static inline int fib_proc_init(struct net *net) 627 { 628 return 0; 629 } fib_proc_exit(struct net * net)630 static inline void fib_proc_exit(struct net *net) 631 { 632 } 633 #endif 634 635 u32 ip_mtu_from_fib_result(struct fib_result *res, __be32 daddr); 636 637 int ip_valid_fib_dump_req(struct net *net, const struct nlmsghdr *nlh, 638 struct fib_dump_filter *filter, 639 struct netlink_callback *cb); 640 641 int fib_nexthop_info(struct sk_buff *skb, const struct fib_nh_common *nh, 642 u8 rt_family, unsigned char *flags, bool skip_oif); 643 int fib_add_nexthop(struct sk_buff *skb, const struct fib_nh_common *nh, 644 int nh_weight, u8 rt_family, u32 nh_tclassid); 645 #endif /* _NET_FIB_H */ 646