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 unsigned char protocol; 273 unsigned char rt_type; 274 unsigned int flags; 275 struct net_device *dev; 276 }; 277 278 int fib_table_lookup(struct fib_table *tb, const struct flowi4 *flp, 279 struct fib_result *res, int fib_flags); 280 int fib_table_insert(struct net *, struct fib_table *, struct fib_config *, 281 struct netlink_ext_ack *extack); 282 int fib_table_delete(struct net *, struct fib_table *, struct fib_config *, 283 struct netlink_ext_ack *extack); 284 int fib_table_dump(struct fib_table *table, struct sk_buff *skb, 285 struct netlink_callback *cb, struct fib_dump_filter *filter); 286 int fib_table_flush(struct net *net, struct fib_table *table, bool flush_all); 287 struct fib_table *fib_trie_unmerge(struct fib_table *main_tb); 288 void fib_table_flush_external(struct fib_table *table); 289 void fib_free_table(struct fib_table *tb); 290 291 #ifndef CONFIG_IP_MULTIPLE_TABLES 292 293 #define TABLE_LOCAL_INDEX (RT_TABLE_LOCAL & (FIB_TABLE_HASHSZ - 1)) 294 #define TABLE_MAIN_INDEX (RT_TABLE_MAIN & (FIB_TABLE_HASHSZ - 1)) 295 296 static inline struct fib_table *fib_get_table(struct net *net, u32 id) 297 { 298 struct hlist_node *tb_hlist; 299 struct hlist_head *ptr; 300 301 ptr = id == RT_TABLE_LOCAL ? 302 &net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX] : 303 &net->ipv4.fib_table_hash[TABLE_MAIN_INDEX]; 304 305 tb_hlist = rcu_dereference_rtnl(hlist_first_rcu(ptr)); 306 307 return hlist_entry(tb_hlist, struct fib_table, tb_hlist); 308 } 309 310 static inline struct fib_table *fib_new_table(struct net *net, u32 id) 311 { 312 return fib_get_table(net, id); 313 } 314 315 static inline int fib_lookup(struct net *net, const struct flowi4 *flp, 316 struct fib_result *res, unsigned int flags) 317 { 318 struct fib_table *tb; 319 int err = -ENETUNREACH; 320 321 rcu_read_lock(); 322 323 tb = fib_get_table(net, RT_TABLE_MAIN); 324 if (tb) 325 err = fib_table_lookup(tb, flp, res, flags | FIB_LOOKUP_NOREF); 326 327 if (err == -EAGAIN) 328 err = -ENETUNREACH; 329 330 rcu_read_unlock(); 331 332 return err; 333 } 334 335 static inline bool fib4_has_custom_rules(const struct net *net) 336 { 337 return false; 338 } 339 340 static inline bool fib4_rule_default(const struct fib_rule *rule) 341 { 342 return true; 343 } 344 345 static inline int fib4_rules_dump(struct net *net, struct notifier_block *nb, 346 struct netlink_ext_ack *extack) 347 { 348 return 0; 349 } 350 351 static inline unsigned int fib4_rules_seq_read(const struct net *net) 352 { 353 return 0; 354 } 355 356 static inline bool fib4_rules_early_flow_dissect(struct net *net, 357 struct sk_buff *skb, 358 struct flowi4 *fl4, 359 struct flow_keys *flkeys) 360 { 361 return false; 362 } 363 #else /* CONFIG_IP_MULTIPLE_TABLES */ 364 int __net_init fib4_rules_init(struct net *net); 365 void __net_exit fib4_rules_exit(struct net *net); 366 367 struct fib_table *fib_new_table(struct net *net, u32 id); 368 struct fib_table *fib_get_table(struct net *net, u32 id); 369 370 int __fib_lookup(struct net *net, struct flowi4 *flp, 371 struct fib_result *res, unsigned int flags); 372 373 static inline int fib_lookup(struct net *net, struct flowi4 *flp, 374 struct fib_result *res, unsigned int flags) 375 { 376 struct fib_table *tb; 377 int err = -EAGAIN; 378 379 flags |= FIB_LOOKUP_NOREF; 380 if (net->ipv4.fib_has_custom_rules) 381 return __fib_lookup(net, flp, res, flags); 382 383 rcu_read_lock(); 384 385 res->tclassid = 0; 386 387 tb = rcu_dereference_rtnl(net->ipv4.fib_main); 388 if (tb) 389 err = fib_table_lookup(tb, flp, res, flags); 390 391 if (err != -EAGAIN) 392 goto out; 393 394 tb = rcu_dereference_rtnl(net->ipv4.fib_default); 395 if (tb) 396 err = fib_table_lookup(tb, flp, res, flags); 397 398 if (err == -EAGAIN) 399 err = -ENETUNREACH; 400 out: 401 rcu_read_unlock(); 402 403 return err; 404 } 405 406 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(const struct net *net); 415 416 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 */ 438 439 static inline bool fib_dscp_masked_match(dscp_t dscp, const struct flowi4 *fl4) 440 { 441 return dscp == (fl4->flowi4_dscp & INET_DSCP_LEGACY_TOS_MASK); 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 dscp_t dscp, int oif, struct net_device *dev, 453 struct in_device *idev, u32 *itag); 454 455 static inline enum skb_drop_reason 456 fib_validate_source_reason(struct sk_buff *skb, __be32 src, __be32 dst, 457 dscp_t dscp, int oif, struct net_device *dev, 458 struct in_device *idev, u32 *itag) 459 { 460 int err = fib_validate_source(skb, src, dst, dscp, oif, dev, idev, 461 itag); 462 if (err < 0) 463 return -err; 464 return SKB_NOT_DROPPED_YET; 465 } 466 467 #ifdef CONFIG_IP_ROUTE_CLASSID 468 static inline int fib_num_tclassid_users(struct net *net) 469 { 470 return atomic_read(&net->ipv4.fib_num_tclassid_users); 471 } 472 #else 473 static inline int fib_num_tclassid_users(struct net *net) 474 { 475 return 0; 476 } 477 #endif 478 int fib_unmerge(struct net *net); 479 480 static inline bool nhc_l3mdev_matches_dev(const struct fib_nh_common *nhc, 481 const struct net_device *dev) 482 { 483 if (nhc->nhc_dev == dev || 484 l3mdev_master_ifindex_rcu(nhc->nhc_dev) == dev->ifindex) 485 return true; 486 487 return false; 488 } 489 490 /* Exported by fib_semantics.c */ 491 int ip_fib_check_default(__be32 gw, struct net_device *dev); 492 int fib_sync_down_dev(struct net_device *dev, unsigned long event, bool force); 493 int fib_sync_down_addr(struct net_device *dev, __be32 local); 494 int fib_sync_up(struct net_device *dev, unsigned char nh_flags); 495 void fib_sync_mtu(struct net_device *dev, u32 orig_mtu); 496 void fib_nhc_update_mtu(struct fib_nh_common *nhc, u32 new, u32 orig); 497 498 /* Fields used for sysctl_fib_multipath_hash_fields. 499 * Common to IPv4 and IPv6. 500 * 501 * Add new fields at the end. This is user API. 502 */ 503 #define FIB_MULTIPATH_HASH_FIELD_SRC_IP BIT(0) 504 #define FIB_MULTIPATH_HASH_FIELD_DST_IP BIT(1) 505 #define FIB_MULTIPATH_HASH_FIELD_IP_PROTO BIT(2) 506 #define FIB_MULTIPATH_HASH_FIELD_FLOWLABEL BIT(3) 507 #define FIB_MULTIPATH_HASH_FIELD_SRC_PORT BIT(4) 508 #define FIB_MULTIPATH_HASH_FIELD_DST_PORT BIT(5) 509 #define FIB_MULTIPATH_HASH_FIELD_INNER_SRC_IP BIT(6) 510 #define FIB_MULTIPATH_HASH_FIELD_INNER_DST_IP BIT(7) 511 #define FIB_MULTIPATH_HASH_FIELD_INNER_IP_PROTO BIT(8) 512 #define FIB_MULTIPATH_HASH_FIELD_INNER_FLOWLABEL BIT(9) 513 #define FIB_MULTIPATH_HASH_FIELD_INNER_SRC_PORT BIT(10) 514 #define FIB_MULTIPATH_HASH_FIELD_INNER_DST_PORT BIT(11) 515 516 #define FIB_MULTIPATH_HASH_FIELD_OUTER_MASK \ 517 (FIB_MULTIPATH_HASH_FIELD_SRC_IP | \ 518 FIB_MULTIPATH_HASH_FIELD_DST_IP | \ 519 FIB_MULTIPATH_HASH_FIELD_IP_PROTO | \ 520 FIB_MULTIPATH_HASH_FIELD_FLOWLABEL | \ 521 FIB_MULTIPATH_HASH_FIELD_SRC_PORT | \ 522 FIB_MULTIPATH_HASH_FIELD_DST_PORT) 523 524 #define FIB_MULTIPATH_HASH_FIELD_INNER_MASK \ 525 (FIB_MULTIPATH_HASH_FIELD_INNER_SRC_IP | \ 526 FIB_MULTIPATH_HASH_FIELD_INNER_DST_IP | \ 527 FIB_MULTIPATH_HASH_FIELD_INNER_IP_PROTO | \ 528 FIB_MULTIPATH_HASH_FIELD_INNER_FLOWLABEL | \ 529 FIB_MULTIPATH_HASH_FIELD_INNER_SRC_PORT | \ 530 FIB_MULTIPATH_HASH_FIELD_INNER_DST_PORT) 531 532 #define FIB_MULTIPATH_HASH_FIELD_ALL_MASK \ 533 (FIB_MULTIPATH_HASH_FIELD_OUTER_MASK | \ 534 FIB_MULTIPATH_HASH_FIELD_INNER_MASK) 535 536 #define FIB_MULTIPATH_HASH_FIELD_DEFAULT_MASK \ 537 (FIB_MULTIPATH_HASH_FIELD_SRC_IP | \ 538 FIB_MULTIPATH_HASH_FIELD_DST_IP | \ 539 FIB_MULTIPATH_HASH_FIELD_IP_PROTO) 540 541 #ifdef CONFIG_IP_ROUTE_MULTIPATH 542 int fib_multipath_hash(const struct net *net, const struct flowi4 *fl4, 543 const struct sk_buff *skb, struct flow_keys *flkeys); 544 545 static void 546 fib_multipath_hash_construct_key(siphash_key_t *key, u32 mp_seed) 547 { 548 u64 mp_seed_64 = mp_seed; 549 550 key->key[0] = (mp_seed_64 << 32) | mp_seed_64; 551 key->key[1] = key->key[0]; 552 } 553 554 static inline u32 fib_multipath_hash_from_keys(const struct net *net, 555 struct flow_keys *keys) 556 { 557 siphash_aligned_key_t hash_key; 558 u32 mp_seed; 559 560 mp_seed = READ_ONCE(net->ipv4.sysctl_fib_multipath_hash_seed.mp_seed); 561 fib_multipath_hash_construct_key(&hash_key, mp_seed); 562 563 return flow_hash_from_keys_seed(keys, &hash_key); 564 } 565 #else 566 static inline u32 fib_multipath_hash_from_keys(const struct net *net, 567 struct flow_keys *keys) 568 { 569 return flow_hash_from_keys(keys); 570 } 571 #endif 572 573 int fib_check_nh(struct net *net, struct fib_nh *nh, u32 table, u8 scope, 574 struct netlink_ext_ack *extack); 575 void fib_select_multipath(struct fib_result *res, int hash, 576 const struct flowi4 *fl4); 577 void fib_select_path(struct net *net, struct fib_result *res, 578 struct flowi4 *fl4, const struct sk_buff *skb); 579 580 int fib_nh_init(struct net *net, struct fib_nh *fib_nh, 581 struct fib_config *cfg, int nh_weight, 582 struct netlink_ext_ack *extack); 583 void fib_nh_release(struct net *net, struct fib_nh *fib_nh); 584 int fib_nh_common_init(struct net *net, struct fib_nh_common *nhc, 585 struct nlattr *fc_encap, u16 fc_encap_type, 586 void *cfg, gfp_t gfp_flags, 587 struct netlink_ext_ack *extack); 588 void fib_nh_common_release(struct fib_nh_common *nhc); 589 590 /* Exported by fib_trie.c */ 591 void fib_alias_hw_flags_set(struct net *net, const struct fib_rt_info *fri); 592 void fib_trie_init(void); 593 struct fib_table *fib_trie_table(u32 id, struct fib_table *alias); 594 bool fib_lookup_good_nhc(const struct fib_nh_common *nhc, int fib_flags, 595 const struct flowi4 *flp); 596 597 static inline void fib_combine_itag(u32 *itag, const struct fib_result *res) 598 { 599 #ifdef CONFIG_IP_ROUTE_CLASSID 600 struct fib_nh_common *nhc = res->nhc; 601 #ifdef CONFIG_IP_MULTIPLE_TABLES 602 u32 rtag; 603 #endif 604 if (nhc->nhc_family == AF_INET) { 605 struct fib_nh *nh; 606 607 nh = container_of(nhc, struct fib_nh, nh_common); 608 *itag = nh->nh_tclassid << 16; 609 } else { 610 *itag = 0; 611 } 612 613 #ifdef CONFIG_IP_MULTIPLE_TABLES 614 rtag = res->tclassid; 615 if (*itag == 0) 616 *itag = (rtag<<16); 617 *itag |= (rtag>>16); 618 #endif 619 #endif 620 } 621 622 void fib_flush(struct net *net); 623 void free_fib_info(struct fib_info *fi); 624 625 static inline void fib_info_hold(struct fib_info *fi) 626 { 627 refcount_inc(&fi->fib_clntref); 628 } 629 630 static inline bool fib_info_hold_safe(struct fib_info *fi) 631 { 632 return refcount_inc_not_zero(&fi->fib_clntref); 633 } 634 635 static inline void fib_info_put(struct fib_info *fi) 636 { 637 if (refcount_dec_and_test(&fi->fib_clntref)) 638 free_fib_info(fi); 639 } 640 641 #ifdef CONFIG_PROC_FS 642 int __net_init fib_proc_init(struct net *net); 643 void __net_exit fib_proc_exit(struct net *net); 644 #else 645 static inline int fib_proc_init(struct net *net) 646 { 647 return 0; 648 } 649 static inline void fib_proc_exit(struct net *net) 650 { 651 } 652 #endif 653 654 u32 ip_mtu_from_fib_result(struct fib_result *res, __be32 daddr); 655 656 int ip_valid_fib_dump_req(struct net *net, const struct nlmsghdr *nlh, 657 struct fib_dump_filter *filter, 658 struct netlink_callback *cb); 659 660 int fib_nexthop_info(struct sk_buff *skb, const struct fib_nh_common *nh, 661 u8 rt_family, unsigned char *flags, bool skip_oif); 662 int fib_add_nexthop(struct sk_buff *skb, const struct fib_nh_common *nh, 663 int nh_weight, u8 rt_family, u32 nh_tclassid); 664 #endif /* _NET_FIB_H */ 665