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