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