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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
28struct 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
58struct fib_info;
59struct rtable;
60
61struct 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
75struct 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
83struct 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
107struct 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
134struct nexthop;
135
136struct 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
165int __net_init fib4_semantics_init(struct net *net);
166void __net_exit fib4_semantics_exit(struct net *net);
167
168#ifdef CONFIG_IP_MULTIPLE_TABLES
169struct fib_rule;
170#endif
171
172struct fib_table;
173struct 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
187struct 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
216struct 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
229struct 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
239struct fib_nh_notifier_info {
240 struct fib_notifier_info info; /* must be first */
241 struct fib_nh *fib_nh;
242};
243
244int call_fib4_notifier(struct notifier_block *nb,
245 enum fib_event_type event_type,
246 struct fib_notifier_info *info);
247int call_fib4_notifiers(struct net *net, enum fib_event_type event_type,
248 struct fib_notifier_info *info);
249
250int __net_init fib4_notifier_init(struct net *net);
251void __net_exit fib4_notifier_exit(struct net *net);
252
253void fib_info_notify_update(struct net *net, struct nl_info *info);
254int fib_notify(struct net *net, struct notifier_block *nb,
255 struct netlink_ext_ack *extack);
256
257struct 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
266struct 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
279int fib_table_lookup(struct fib_table *tb, const struct flowi4 *flp,
280 struct fib_result *res, int fib_flags);
281int fib_table_insert(struct net *, struct fib_table *, struct fib_config *,
282 struct netlink_ext_ack *extack);
283int fib_table_delete(struct net *, struct fib_table *, struct fib_config *,
284 struct netlink_ext_ack *extack);
285int fib_table_dump(struct fib_table *table, struct sk_buff *skb,
286 struct netlink_callback *cb, struct fib_dump_filter *filter);
287int fib_table_flush(struct net *net, struct fib_table *table, bool flush_all);
288struct fib_table *fib_trie_unmerge(struct fib_table *main_tb);
289void fib_table_flush_external(struct fib_table *table);
290void 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
297static 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
311static inline struct fib_table *fib_new_table(struct net *net, u32 id)
312{
313 return fib_get_table(net, id);
314}
315
316static 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
336static inline bool fib4_has_custom_rules(const struct net *net)
337{
338 return false;
339}
340
341static inline bool fib4_rule_default(const struct fib_rule *rule)
342{
343 return true;
344}
345
346static inline int fib4_rules_dump(struct net *net, struct notifier_block *nb,
347 struct netlink_ext_ack *extack)
348{
349 return 0;
350}
351
352static inline unsigned int fib4_rules_seq_read(const struct net *net)
353{
354 return 0;
355}
356
357static 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 */
365int __net_init fib4_rules_init(struct net *net);
366void __net_exit fib4_rules_exit(struct net *net);
367
368struct fib_table *fib_new_table(struct net *net, u32 id);
369struct fib_table *fib_get_table(struct net *net, u32 id);
370
371int __fib_lookup(struct net *net, struct flowi4 *flp,
372 struct fib_result *res, unsigned int flags);
373
374static 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
399out:
400 if (err == -EAGAIN)
401 err = -ENETUNREACH;
402
403 rcu_read_unlock();
404
405 return err;
406}
407
408static inline bool fib4_has_custom_rules(const struct net *net)
409{
410 return net->ipv4.fib_has_custom_rules;
411}
412
413bool fib4_rule_default(const struct fib_rule *rule);
414int fib4_rules_dump(struct net *net, struct notifier_block *nb,
415 struct netlink_ext_ack *extack);
416unsigned int fib4_rules_seq_read(const struct net *net);
417
418static 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
441static inline bool fib_dscp_masked_match(dscp_t dscp, const struct flowi4 *fl4)
442{
443 return dscp == (fl4->flowi4_dscp & INET_DSCP_LEGACY_TOS_MASK);
444}
445
446/* Exported by fib_frontend.c */
447extern const struct nla_policy rtm_ipv4_policy[];
448void ip_fib_init(void);
449int 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);
452bool fib_info_nh_uses_dev(struct fib_info *fi, const struct net_device *dev);
453int 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
457static inline enum skb_drop_reason
458fib_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
470static inline int fib_num_tclassid_users(struct net *net)
471{
472 return atomic_read(&net->ipv4.fib_num_tclassid_users);
473}
474#else
475static inline int fib_num_tclassid_users(struct net *net)
476{
477 return 0;
478}
479#endif
480int fib_unmerge(struct net *net);
481
482static inline bool nhc_l3mdev_matches_dev(const struct fib_nh_common *nhc,
483const 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 */
493int ip_fib_check_default(__be32 gw, struct net_device *dev);
494int fib_sync_down_dev(struct net_device *dev, unsigned long event, bool force);
495int fib_sync_down_addr(struct net_device *dev, __be32 local);
496int fib_sync_up(struct net_device *dev, unsigned char nh_flags);
497void fib_sync_mtu(struct net_device *dev, u32 orig_mtu);
498void 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
544int fib_multipath_hash(const struct net *net, const struct flowi4 *fl4,
545 const struct sk_buff *skb, struct flow_keys *flkeys);
546
547static void
548fib_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
556static 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
568static 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
575int fib_check_nh(struct net *net, struct fib_nh *nh, u32 table, u8 scope,
576 struct netlink_ext_ack *extack);
577void fib_select_multipath(struct fib_result *res, int hash,
578 const struct flowi4 *fl4);
579void fib_select_path(struct net *net, struct fib_result *res,
580 struct flowi4 *fl4, const struct sk_buff *skb);
581
582int fib_nh_init(struct net *net, struct fib_nh *fib_nh,
583 struct fib_config *cfg, int nh_weight,
584 struct netlink_ext_ack *extack);
585void fib_nh_release(struct net *net, struct fib_nh *fib_nh);
586int fib_nh_common_init(struct net *net, struct fib_nh_common *nhc,
587 struct nlattr *fc_encap, u16 fc_encap_type,
588 void *cfg, gfp_t gfp_flags,
589 struct netlink_ext_ack *extack);
590void fib_nh_common_release(struct fib_nh_common *nhc);
591
592/* Exported by fib_trie.c */
593void fib_alias_hw_flags_set(struct net *net, const struct fib_rt_info *fri);
594void fib_trie_init(void);
595struct fib_table *fib_trie_table(u32 id, struct fib_table *alias);
596bool fib_lookup_good_nhc(const struct fib_nh_common *nhc, int fib_flags,
597 const struct flowi4 *flp);
598
599static inline void fib_combine_itag(u32 *itag, const struct fib_result *res)
600{
601#ifdef CONFIG_IP_ROUTE_CLASSID
602 struct fib_nh_common *nhc = res->nhc;
603#ifdef CONFIG_IP_MULTIPLE_TABLES
604 u32 rtag;
605#endif
606 if (nhc->nhc_family == AF_INET) {
607 struct fib_nh *nh;
608
609 nh = container_of(nhc, struct fib_nh, nh_common);
610 *itag = nh->nh_tclassid << 16;
611 } else {
612 *itag = 0;
613 }
614
615#ifdef CONFIG_IP_MULTIPLE_TABLES
616 rtag = res->tclassid;
617 if (*itag == 0)
618 *itag = (rtag<<16);
619 *itag |= (rtag>>16);
620#endif
621#endif
622}
623
624void fib_flush(struct net *net);
625void free_fib_info(struct fib_info *fi);
626
627static inline void fib_info_hold(struct fib_info *fi)
628{
629 refcount_inc(&fi->fib_clntref);
630}
631
632static inline void fib_info_put(struct fib_info *fi)
633{
634 if (refcount_dec_and_test(&fi->fib_clntref))
635 free_fib_info(fi);
636}
637
638#ifdef CONFIG_PROC_FS
639int __net_init fib_proc_init(struct net *net);
640void __net_exit fib_proc_exit(struct net *net);
641#else
642static inline int fib_proc_init(struct net *net)
643{
644 return 0;
645}
646static inline void fib_proc_exit(struct net *net)
647{
648}
649#endif
650
651u32 ip_mtu_from_fib_result(struct fib_result *res, __be32 daddr);
652
653int ip_valid_fib_dump_req(struct net *net, const struct nlmsghdr *nlh,
654 struct fib_dump_filter *filter,
655 struct netlink_callback *cb);
656
657int fib_nexthop_info(struct sk_buff *skb, const struct fib_nh_common *nh,
658 u8 rt_family, unsigned char *flags, bool skip_oif);
659int fib_add_nexthop(struct sk_buff *skb, const struct fib_nh_common *nh,
660 int nh_weight, u8 rt_family, u32 nh_tclassid);
661#endif /* _NET_FIB_H */