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 int __net_init fib4_semantics_init(struct net *net); 166 void __net_exit fib4_semantics_exit(struct net *net); 167 168 #ifdef CONFIG_IP_MULTIPLE_TABLES 169 struct fib_rule; 170 #endif 171 172 struct fib_table; 173 struct fib_result { 174 __be32 prefix; 175 unsigned char prefixlen; 176 unsigned char nh_sel; 177 unsigned char type; 178 unsigned char scope; 179 u32 tclassid; 180 dscp_t dscp; 181 struct fib_nh_common *nhc; 182 struct fib_info *fi; 183 struct fib_table *table; 184 struct hlist_head *fa_head; 185 }; 186 187 struct fib_result_nl { 188 __be32 fl_addr; /* To be looked up*/ 189 u32 fl_mark; 190 unsigned char fl_tos; 191 unsigned char fl_scope; 192 unsigned char tb_id_in; 193 194 unsigned char tb_id; /* Results */ 195 unsigned char prefixlen; 196 unsigned char nh_sel; 197 unsigned char type; 198 unsigned char scope; 199 int err; 200 }; 201 202 #ifdef CONFIG_IP_MULTIPLE_TABLES 203 #define FIB_TABLE_HASHSZ 256 204 #else 205 #define FIB_TABLE_HASHSZ 2 206 #endif 207 208 __be32 fib_info_update_nhc_saddr(struct net *net, struct fib_nh_common *nhc, 209 unsigned char scope); 210 __be32 fib_result_prefsrc(struct net *net, struct fib_result *res); 211 212 #define FIB_RES_NHC(res) ((res).nhc) 213 #define FIB_RES_DEV(res) (FIB_RES_NHC(res)->nhc_dev) 214 #define FIB_RES_OIF(res) (FIB_RES_NHC(res)->nhc_oif) 215 216 struct fib_rt_info { 217 struct fib_info *fi; 218 u32 tb_id; 219 __be32 dst; 220 int dst_len; 221 dscp_t dscp; 222 u8 type; 223 u8 offload:1, 224 trap:1, 225 offload_failed:1, 226 unused:5; 227 }; 228 229 struct fib_entry_notifier_info { 230 struct fib_notifier_info info; /* must be first */ 231 u32 dst; 232 int dst_len; 233 struct fib_info *fi; 234 dscp_t dscp; 235 u8 type; 236 u32 tb_id; 237 }; 238 239 struct fib_nh_notifier_info { 240 struct fib_notifier_info info; /* must be first */ 241 struct fib_nh *fib_nh; 242 }; 243 244 int call_fib4_notifier(struct notifier_block *nb, 245 enum fib_event_type event_type, 246 struct fib_notifier_info *info); 247 int call_fib4_notifiers(struct net *net, enum fib_event_type event_type, 248 struct fib_notifier_info *info); 249 250 int __net_init fib4_notifier_init(struct net *net); 251 void __net_exit fib4_notifier_exit(struct net *net); 252 253 void fib_info_notify_update(struct net *net, struct nl_info *info); 254 int fib_notify(struct net *net, struct notifier_block *nb, 255 struct netlink_ext_ack *extack); 256 257 struct fib_table { 258 struct hlist_node tb_hlist; 259 u32 tb_id; 260 int tb_num_default; 261 struct rcu_head rcu; 262 unsigned long *tb_data; 263 unsigned long __data[]; 264 }; 265 266 struct fib_dump_filter { 267 u32 table_id; 268 /* filter_set is an optimization that an entry is set */ 269 bool filter_set; 270 bool dump_routes; 271 bool dump_exceptions; 272 bool rtnl_held; 273 unsigned char protocol; 274 unsigned char rt_type; 275 unsigned int flags; 276 struct net_device *dev; 277 }; 278 279 int fib_table_lookup(struct fib_table *tb, const struct flowi4 *flp, 280 struct fib_result *res, int fib_flags); 281 int fib_table_insert(struct net *, struct fib_table *, struct fib_config *, 282 struct netlink_ext_ack *extack); 283 int fib_table_delete(struct net *, struct fib_table *, struct fib_config *, 284 struct netlink_ext_ack *extack); 285 int fib_table_dump(struct fib_table *table, struct sk_buff *skb, 286 struct netlink_callback *cb, struct fib_dump_filter *filter); 287 int fib_table_flush(struct net *net, struct fib_table *table, bool flush_all); 288 struct fib_table *fib_trie_unmerge(struct fib_table *main_tb); 289 void fib_table_flush_external(struct fib_table *table); 290 void fib_free_table(struct fib_table *tb); 291 292 #ifndef CONFIG_IP_MULTIPLE_TABLES 293 294 #define TABLE_LOCAL_INDEX (RT_TABLE_LOCAL & (FIB_TABLE_HASHSZ - 1)) 295 #define TABLE_MAIN_INDEX (RT_TABLE_MAIN & (FIB_TABLE_HASHSZ - 1)) 296 297 static inline struct fib_table *fib_get_table(struct net *net, u32 id) 298 { 299 struct hlist_node *tb_hlist; 300 struct hlist_head *ptr; 301 302 ptr = id == RT_TABLE_LOCAL ? 303 &net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX] : 304 &net->ipv4.fib_table_hash[TABLE_MAIN_INDEX]; 305 306 tb_hlist = rcu_dereference_rtnl(hlist_first_rcu(ptr)); 307 308 return hlist_entry(tb_hlist, struct fib_table, tb_hlist); 309 } 310 311 static inline struct fib_table *fib_new_table(struct net *net, u32 id) 312 { 313 return fib_get_table(net, id); 314 } 315 316 static inline int fib_lookup(struct net *net, const struct flowi4 *flp, 317 struct fib_result *res, unsigned int flags) 318 { 319 struct fib_table *tb; 320 int err = -ENETUNREACH; 321 322 rcu_read_lock(); 323 324 tb = fib_get_table(net, RT_TABLE_MAIN); 325 if (tb) 326 err = fib_table_lookup(tb, flp, res, flags | FIB_LOOKUP_NOREF); 327 328 if (err == -EAGAIN) 329 err = -ENETUNREACH; 330 331 rcu_read_unlock(); 332 333 return err; 334 } 335 336 static inline bool fib4_has_custom_rules(const struct net *net) 337 { 338 return false; 339 } 340 341 static inline bool fib4_rule_default(const struct fib_rule *rule) 342 { 343 return true; 344 } 345 346 static inline int fib4_rules_dump(struct net *net, struct notifier_block *nb, 347 struct netlink_ext_ack *extack) 348 { 349 return 0; 350 } 351 352 static inline unsigned int fib4_rules_seq_read(const struct net *net) 353 { 354 return 0; 355 } 356 357 static inline bool fib4_rules_early_flow_dissect(struct net *net, 358 struct sk_buff *skb, 359 struct flowi4 *fl4, 360 struct flow_keys *flkeys) 361 { 362 return false; 363 } 364 #else /* CONFIG_IP_MULTIPLE_TABLES */ 365 int __net_init fib4_rules_init(struct net *net); 366 void __net_exit fib4_rules_exit(struct net *net); 367 368 struct fib_table *fib_new_table(struct net *net, u32 id); 369 struct fib_table *fib_get_table(struct net *net, u32 id); 370 371 int __fib_lookup(struct net *net, struct flowi4 *flp, 372 struct fib_result *res, unsigned int flags); 373 374 static inline int fib_lookup(struct net *net, struct flowi4 *flp, 375 struct fib_result *res, unsigned int flags) 376 { 377 struct fib_table *tb; 378 int err = -ENETUNREACH; 379 380 flags |= FIB_LOOKUP_NOREF; 381 if (net->ipv4.fib_has_custom_rules) 382 return __fib_lookup(net, flp, res, flags); 383 384 rcu_read_lock(); 385 386 res->tclassid = 0; 387 388 tb = rcu_dereference_rtnl(net->ipv4.fib_main); 389 if (tb) 390 err = fib_table_lookup(tb, flp, res, flags); 391 392 if (!err) 393 goto out; 394 395 tb = rcu_dereference_rtnl(net->ipv4.fib_default); 396 if (tb) 397 err = fib_table_lookup(tb, flp, res, flags); 398 399 out: 400 if (err == -EAGAIN) 401 err = -ENETUNREACH; 402 403 rcu_read_unlock(); 404 405 return err; 406 } 407 408 static inline bool fib4_has_custom_rules(const struct net *net) 409 { 410 return net->ipv4.fib_has_custom_rules; 411 } 412 413 bool fib4_rule_default(const struct fib_rule *rule); 414 int fib4_rules_dump(struct net *net, struct notifier_block *nb, 415 struct netlink_ext_ack *extack); 416 unsigned int fib4_rules_seq_read(const struct net *net); 417 418 static inline bool fib4_rules_early_flow_dissect(struct net *net, 419 struct sk_buff *skb, 420 struct flowi4 *fl4, 421 struct flow_keys *flkeys) 422 { 423 unsigned int flag = FLOW_DISSECTOR_F_STOP_AT_ENCAP; 424 425 if (!net->ipv4.fib_rules_require_fldissect) 426 return false; 427 428 memset(flkeys, 0, sizeof(*flkeys)); 429 __skb_flow_dissect(net, skb, &flow_keys_dissector, 430 flkeys, NULL, 0, 0, 0, flag); 431 432 fl4->fl4_sport = flkeys->ports.src; 433 fl4->fl4_dport = flkeys->ports.dst; 434 fl4->flowi4_proto = flkeys->basic.ip_proto; 435 436 return true; 437 } 438 439 #endif /* CONFIG_IP_MULTIPLE_TABLES */ 440 441 static inline bool fib_dscp_masked_match(dscp_t dscp, const struct flowi4 *fl4) 442 { 443 return dscp == inet_dsfield_to_dscp(RT_TOS(fl4->flowi4_tos)); 444 } 445 446 /* Exported by fib_frontend.c */ 447 extern const struct nla_policy rtm_ipv4_policy[]; 448 void ip_fib_init(void); 449 int fib_gw_from_via(struct fib_config *cfg, struct nlattr *nla, 450 struct netlink_ext_ack *extack); 451 __be32 fib_compute_spec_dst(struct sk_buff *skb); 452 bool fib_info_nh_uses_dev(struct fib_info *fi, const struct net_device *dev); 453 int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst, 454 dscp_t dscp, int oif, struct net_device *dev, 455 struct in_device *idev, u32 *itag); 456 457 static inline enum skb_drop_reason 458 fib_validate_source_reason(struct sk_buff *skb, __be32 src, __be32 dst, 459 dscp_t dscp, int oif, struct net_device *dev, 460 struct in_device *idev, u32 *itag) 461 { 462 int err = fib_validate_source(skb, src, dst, dscp, oif, dev, idev, 463 itag); 464 if (err < 0) 465 return -err; 466 return SKB_NOT_DROPPED_YET; 467 } 468 469 #ifdef CONFIG_IP_ROUTE_CLASSID 470 static inline int fib_num_tclassid_users(struct net *net) 471 { 472 return atomic_read(&net->ipv4.fib_num_tclassid_users); 473 } 474 #else 475 static inline int fib_num_tclassid_users(struct net *net) 476 { 477 return 0; 478 } 479 #endif 480 int fib_unmerge(struct net *net); 481 482 static inline bool nhc_l3mdev_matches_dev(const struct fib_nh_common *nhc, 483 const struct net_device *dev) 484 { 485 if (nhc->nhc_dev == dev || 486 l3mdev_master_ifindex_rcu(nhc->nhc_dev) == dev->ifindex) 487 return true; 488 489 return false; 490 } 491 492 /* Exported by fib_semantics.c */ 493 int ip_fib_check_default(__be32 gw, struct net_device *dev); 494 int fib_sync_down_dev(struct net_device *dev, unsigned long event, bool force); 495 int fib_sync_down_addr(struct net_device *dev, __be32 local); 496 int fib_sync_up(struct net_device *dev, unsigned char nh_flags); 497 void fib_sync_mtu(struct net_device *dev, u32 orig_mtu); 498 void fib_nhc_update_mtu(struct fib_nh_common *nhc, u32 new, u32 orig); 499 500 /* Fields used for sysctl_fib_multipath_hash_fields. 501 * Common to IPv4 and IPv6. 502 * 503 * Add new fields at the end. This is user API. 504 */ 505 #define FIB_MULTIPATH_HASH_FIELD_SRC_IP BIT(0) 506 #define FIB_MULTIPATH_HASH_FIELD_DST_IP BIT(1) 507 #define FIB_MULTIPATH_HASH_FIELD_IP_PROTO BIT(2) 508 #define FIB_MULTIPATH_HASH_FIELD_FLOWLABEL BIT(3) 509 #define FIB_MULTIPATH_HASH_FIELD_SRC_PORT BIT(4) 510 #define FIB_MULTIPATH_HASH_FIELD_DST_PORT BIT(5) 511 #define FIB_MULTIPATH_HASH_FIELD_INNER_SRC_IP BIT(6) 512 #define FIB_MULTIPATH_HASH_FIELD_INNER_DST_IP BIT(7) 513 #define FIB_MULTIPATH_HASH_FIELD_INNER_IP_PROTO BIT(8) 514 #define FIB_MULTIPATH_HASH_FIELD_INNER_FLOWLABEL BIT(9) 515 #define FIB_MULTIPATH_HASH_FIELD_INNER_SRC_PORT BIT(10) 516 #define FIB_MULTIPATH_HASH_FIELD_INNER_DST_PORT BIT(11) 517 518 #define FIB_MULTIPATH_HASH_FIELD_OUTER_MASK \ 519 (FIB_MULTIPATH_HASH_FIELD_SRC_IP | \ 520 FIB_MULTIPATH_HASH_FIELD_DST_IP | \ 521 FIB_MULTIPATH_HASH_FIELD_IP_PROTO | \ 522 FIB_MULTIPATH_HASH_FIELD_FLOWLABEL | \ 523 FIB_MULTIPATH_HASH_FIELD_SRC_PORT | \ 524 FIB_MULTIPATH_HASH_FIELD_DST_PORT) 525 526 #define FIB_MULTIPATH_HASH_FIELD_INNER_MASK \ 527 (FIB_MULTIPATH_HASH_FIELD_INNER_SRC_IP | \ 528 FIB_MULTIPATH_HASH_FIELD_INNER_DST_IP | \ 529 FIB_MULTIPATH_HASH_FIELD_INNER_IP_PROTO | \ 530 FIB_MULTIPATH_HASH_FIELD_INNER_FLOWLABEL | \ 531 FIB_MULTIPATH_HASH_FIELD_INNER_SRC_PORT | \ 532 FIB_MULTIPATH_HASH_FIELD_INNER_DST_PORT) 533 534 #define FIB_MULTIPATH_HASH_FIELD_ALL_MASK \ 535 (FIB_MULTIPATH_HASH_FIELD_OUTER_MASK | \ 536 FIB_MULTIPATH_HASH_FIELD_INNER_MASK) 537 538 #define FIB_MULTIPATH_HASH_FIELD_DEFAULT_MASK \ 539 (FIB_MULTIPATH_HASH_FIELD_SRC_IP | \ 540 FIB_MULTIPATH_HASH_FIELD_DST_IP | \ 541 FIB_MULTIPATH_HASH_FIELD_IP_PROTO) 542 543 #ifdef CONFIG_IP_ROUTE_MULTIPATH 544 int fib_multipath_hash(const struct net *net, const struct flowi4 *fl4, 545 const struct sk_buff *skb, struct flow_keys *flkeys); 546 547 static void 548 fib_multipath_hash_construct_key(siphash_key_t *key, u32 mp_seed) 549 { 550 u64 mp_seed_64 = mp_seed; 551 552 key->key[0] = (mp_seed_64 << 32) | mp_seed_64; 553 key->key[1] = key->key[0]; 554 } 555 556 static inline u32 fib_multipath_hash_from_keys(const struct net *net, 557 struct flow_keys *keys) 558 { 559 siphash_aligned_key_t hash_key; 560 u32 mp_seed; 561 562 mp_seed = READ_ONCE(net->ipv4.sysctl_fib_multipath_hash_seed).mp_seed; 563 fib_multipath_hash_construct_key(&hash_key, mp_seed); 564 565 return flow_hash_from_keys_seed(keys, &hash_key); 566 } 567 #else 568 static inline u32 fib_multipath_hash_from_keys(const struct net *net, 569 struct flow_keys *keys) 570 { 571 return flow_hash_from_keys(keys); 572 } 573 #endif 574 575 int fib_check_nh(struct net *net, struct fib_nh *nh, u32 table, u8 scope, 576 struct netlink_ext_ack *extack); 577 void fib_select_multipath(struct fib_result *res, int hash); 578 void fib_select_path(struct net *net, struct fib_result *res, 579 struct flowi4 *fl4, const struct sk_buff *skb); 580 581 int fib_nh_init(struct net *net, struct fib_nh *fib_nh, 582 struct fib_config *cfg, int nh_weight, 583 struct netlink_ext_ack *extack); 584 void fib_nh_release(struct net *net, struct fib_nh *fib_nh); 585 int fib_nh_common_init(struct net *net, struct fib_nh_common *nhc, 586 struct nlattr *fc_encap, u16 fc_encap_type, 587 void *cfg, gfp_t gfp_flags, 588 struct netlink_ext_ack *extack); 589 void fib_nh_common_release(struct fib_nh_common *nhc); 590 591 /* Exported by fib_trie.c */ 592 void fib_alias_hw_flags_set(struct net *net, const struct fib_rt_info *fri); 593 void fib_trie_init(void); 594 struct fib_table *fib_trie_table(u32 id, struct fib_table *alias); 595 bool fib_lookup_good_nhc(const struct fib_nh_common *nhc, int fib_flags, 596 const struct flowi4 *flp); 597 598 static inline void fib_combine_itag(u32 *itag, const struct fib_result *res) 599 { 600 #ifdef CONFIG_IP_ROUTE_CLASSID 601 struct fib_nh_common *nhc = res->nhc; 602 #ifdef CONFIG_IP_MULTIPLE_TABLES 603 u32 rtag; 604 #endif 605 if (nhc->nhc_family == AF_INET) { 606 struct fib_nh *nh; 607 608 nh = container_of(nhc, struct fib_nh, nh_common); 609 *itag = nh->nh_tclassid << 16; 610 } else { 611 *itag = 0; 612 } 613 614 #ifdef CONFIG_IP_MULTIPLE_TABLES 615 rtag = res->tclassid; 616 if (*itag == 0) 617 *itag = (rtag<<16); 618 *itag |= (rtag>>16); 619 #endif 620 #endif 621 } 622 623 void fib_flush(struct net *net); 624 void free_fib_info(struct fib_info *fi); 625 626 static inline void fib_info_hold(struct fib_info *fi) 627 { 628 refcount_inc(&fi->fib_clntref); 629 } 630 631 static inline void fib_info_put(struct fib_info *fi) 632 { 633 if (refcount_dec_and_test(&fi->fib_clntref)) 634 free_fib_info(fi); 635 } 636 637 #ifdef CONFIG_PROC_FS 638 int __net_init fib_proc_init(struct net *net); 639 void __net_exit fib_proc_exit(struct net *net); 640 #else 641 static inline int fib_proc_init(struct net *net) 642 { 643 return 0; 644 } 645 static inline void fib_proc_exit(struct net *net) 646 { 647 } 648 #endif 649 650 u32 ip_mtu_from_fib_result(struct fib_result *res, __be32 daddr); 651 652 int ip_valid_fib_dump_req(struct net *net, const struct nlmsghdr *nlh, 653 struct fib_dump_filter *filter, 654 struct netlink_callback *cb); 655 656 int fib_nexthop_info(struct sk_buff *skb, const struct fib_nh_common *nh, 657 u8 rt_family, unsigned char *flags, bool skip_oif); 658 int fib_add_nexthop(struct sk_buff *skb, const struct fib_nh_common *nh, 659 int nh_weight, u8 rt_family, u32 nh_tclassid); 660 #endif /* _NET_FIB_H */ 661