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[J-linux.git] / include / net / ip_fib.h
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, <[email protected]>
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
166 #ifdef CONFIG_IP_MULTIPLE_TABLES
167 struct fib_rule;
168 #endif
169
170 struct fib_table;
171 struct fib_result {
172         __be32                  prefix;
173         unsigned char           prefixlen;
174         unsigned char           nh_sel;
175         unsigned char           type;
176         unsigned char           scope;
177         u32                     tclassid;
178         dscp_t                  dscp;
179         struct fib_nh_common    *nhc;
180         struct fib_info         *fi;
181         struct fib_table        *table;
182         struct hlist_head       *fa_head;
183 };
184
185 struct fib_result_nl {
186         __be32          fl_addr;   /* To be looked up*/
187         u32             fl_mark;
188         unsigned char   fl_tos;
189         unsigned char   fl_scope;
190         unsigned char   tb_id_in;
191
192         unsigned char   tb_id;      /* Results */
193         unsigned char   prefixlen;
194         unsigned char   nh_sel;
195         unsigned char   type;
196         unsigned char   scope;
197         int             err;
198 };
199
200 #ifdef CONFIG_IP_MULTIPLE_TABLES
201 #define FIB_TABLE_HASHSZ 256
202 #else
203 #define FIB_TABLE_HASHSZ 2
204 #endif
205
206 __be32 fib_info_update_nhc_saddr(struct net *net, struct fib_nh_common *nhc,
207                                  unsigned char scope);
208 __be32 fib_result_prefsrc(struct net *net, struct fib_result *res);
209
210 #define FIB_RES_NHC(res)                ((res).nhc)
211 #define FIB_RES_DEV(res)        (FIB_RES_NHC(res)->nhc_dev)
212 #define FIB_RES_OIF(res)        (FIB_RES_NHC(res)->nhc_oif)
213
214 struct fib_rt_info {
215         struct fib_info         *fi;
216         u32                     tb_id;
217         __be32                  dst;
218         int                     dst_len;
219         dscp_t                  dscp;
220         u8                      type;
221         u8                      offload:1,
222                                 trap:1,
223                                 offload_failed:1,
224                                 unused:5;
225 };
226
227 struct fib_entry_notifier_info {
228         struct fib_notifier_info info; /* must be first */
229         u32 dst;
230         int dst_len;
231         struct fib_info *fi;
232         dscp_t dscp;
233         u8 type;
234         u32 tb_id;
235 };
236
237 struct fib_nh_notifier_info {
238         struct fib_notifier_info info; /* must be first */
239         struct fib_nh *fib_nh;
240 };
241
242 int call_fib4_notifier(struct notifier_block *nb,
243                        enum fib_event_type event_type,
244                        struct fib_notifier_info *info);
245 int call_fib4_notifiers(struct net *net, enum fib_event_type event_type,
246                         struct fib_notifier_info *info);
247
248 int __net_init fib4_notifier_init(struct net *net);
249 void __net_exit fib4_notifier_exit(struct net *net);
250
251 void fib_info_notify_update(struct net *net, struct nl_info *info);
252 int fib_notify(struct net *net, struct notifier_block *nb,
253                struct netlink_ext_ack *extack);
254
255 struct fib_table {
256         struct hlist_node       tb_hlist;
257         u32                     tb_id;
258         int                     tb_num_default;
259         struct rcu_head         rcu;
260         unsigned long           *tb_data;
261         unsigned long           __data[];
262 };
263
264 struct fib_dump_filter {
265         u32                     table_id;
266         /* filter_set is an optimization that an entry is set */
267         bool                    filter_set;
268         bool                    dump_routes;
269         bool                    dump_exceptions;
270         bool                    rtnl_held;
271         unsigned char           protocol;
272         unsigned char           rt_type;
273         unsigned int            flags;
274         struct net_device       *dev;
275 };
276
277 int fib_table_lookup(struct fib_table *tb, const struct flowi4 *flp,
278                      struct fib_result *res, int fib_flags);
279 int fib_table_insert(struct net *, struct fib_table *, struct fib_config *,
280                      struct netlink_ext_ack *extack);
281 int fib_table_delete(struct net *, struct fib_table *, struct fib_config *,
282                      struct netlink_ext_ack *extack);
283 int fib_table_dump(struct fib_table *table, struct sk_buff *skb,
284                    struct netlink_callback *cb, struct fib_dump_filter *filter);
285 int fib_table_flush(struct net *net, struct fib_table *table, bool flush_all);
286 struct fib_table *fib_trie_unmerge(struct fib_table *main_tb);
287 void fib_table_flush_external(struct fib_table *table);
288 void fib_free_table(struct fib_table *tb);
289
290 #ifndef CONFIG_IP_MULTIPLE_TABLES
291
292 #define TABLE_LOCAL_INDEX       (RT_TABLE_LOCAL & (FIB_TABLE_HASHSZ - 1))
293 #define TABLE_MAIN_INDEX        (RT_TABLE_MAIN  & (FIB_TABLE_HASHSZ - 1))
294
295 static inline struct fib_table *fib_get_table(struct net *net, u32 id)
296 {
297         struct hlist_node *tb_hlist;
298         struct hlist_head *ptr;
299
300         ptr = id == RT_TABLE_LOCAL ?
301                 &net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX] :
302                 &net->ipv4.fib_table_hash[TABLE_MAIN_INDEX];
303
304         tb_hlist = rcu_dereference_rtnl(hlist_first_rcu(ptr));
305
306         return hlist_entry(tb_hlist, struct fib_table, tb_hlist);
307 }
308
309 static inline struct fib_table *fib_new_table(struct net *net, u32 id)
310 {
311         return fib_get_table(net, id);
312 }
313
314 static inline int fib_lookup(struct net *net, const struct flowi4 *flp,
315                              struct fib_result *res, unsigned int flags)
316 {
317         struct fib_table *tb;
318         int err = -ENETUNREACH;
319
320         rcu_read_lock();
321
322         tb = fib_get_table(net, RT_TABLE_MAIN);
323         if (tb)
324                 err = fib_table_lookup(tb, flp, res, flags | FIB_LOOKUP_NOREF);
325
326         if (err == -EAGAIN)
327                 err = -ENETUNREACH;
328
329         rcu_read_unlock();
330
331         return err;
332 }
333
334 static inline bool fib4_has_custom_rules(const struct net *net)
335 {
336         return false;
337 }
338
339 static inline bool fib4_rule_default(const struct fib_rule *rule)
340 {
341         return true;
342 }
343
344 static inline int fib4_rules_dump(struct net *net, struct notifier_block *nb,
345                                   struct netlink_ext_ack *extack)
346 {
347         return 0;
348 }
349
350 static inline unsigned int fib4_rules_seq_read(const struct net *net)
351 {
352         return 0;
353 }
354
355 static inline bool fib4_rules_early_flow_dissect(struct net *net,
356                                                  struct sk_buff *skb,
357                                                  struct flowi4 *fl4,
358                                                  struct flow_keys *flkeys)
359 {
360         return false;
361 }
362 #else /* CONFIG_IP_MULTIPLE_TABLES */
363 int __net_init fib4_rules_init(struct net *net);
364 void __net_exit fib4_rules_exit(struct net *net);
365
366 struct fib_table *fib_new_table(struct net *net, u32 id);
367 struct fib_table *fib_get_table(struct net *net, u32 id);
368
369 int __fib_lookup(struct net *net, struct flowi4 *flp,
370                  struct fib_result *res, unsigned int flags);
371
372 static inline int fib_lookup(struct net *net, struct flowi4 *flp,
373                              struct fib_result *res, unsigned int flags)
374 {
375         struct fib_table *tb;
376         int err = -ENETUNREACH;
377
378         flags |= FIB_LOOKUP_NOREF;
379         if (net->ipv4.fib_has_custom_rules)
380                 return __fib_lookup(net, flp, res, flags);
381
382         rcu_read_lock();
383
384         res->tclassid = 0;
385
386         tb = rcu_dereference_rtnl(net->ipv4.fib_main);
387         if (tb)
388                 err = fib_table_lookup(tb, flp, res, flags);
389
390         if (!err)
391                 goto out;
392
393         tb = rcu_dereference_rtnl(net->ipv4.fib_default);
394         if (tb)
395                 err = fib_table_lookup(tb, flp, res, flags);
396
397 out:
398         if (err == -EAGAIN)
399                 err = -ENETUNREACH;
400
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 == inet_dsfield_to_dscp(RT_TOS(fl4->flowi4_tos));
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 void fib_select_path(struct net *net, struct fib_result *res,
577                      struct flowi4 *fl4, const struct sk_buff *skb);
578
579 int fib_nh_init(struct net *net, struct fib_nh *fib_nh,
580                 struct fib_config *cfg, int nh_weight,
581                 struct netlink_ext_ack *extack);
582 void fib_nh_release(struct net *net, struct fib_nh *fib_nh);
583 int fib_nh_common_init(struct net *net, struct fib_nh_common *nhc,
584                        struct nlattr *fc_encap, u16 fc_encap_type,
585                        void *cfg, gfp_t gfp_flags,
586                        struct netlink_ext_ack *extack);
587 void fib_nh_common_release(struct fib_nh_common *nhc);
588
589 /* Exported by fib_trie.c */
590 void fib_alias_hw_flags_set(struct net *net, const struct fib_rt_info *fri);
591 void fib_trie_init(void);
592 struct fib_table *fib_trie_table(u32 id, struct fib_table *alias);
593 bool fib_lookup_good_nhc(const struct fib_nh_common *nhc, int fib_flags,
594                          const struct flowi4 *flp);
595
596 static inline void fib_combine_itag(u32 *itag, const struct fib_result *res)
597 {
598 #ifdef CONFIG_IP_ROUTE_CLASSID
599         struct fib_nh_common *nhc = res->nhc;
600 #ifdef CONFIG_IP_MULTIPLE_TABLES
601         u32 rtag;
602 #endif
603         if (nhc->nhc_family == AF_INET) {
604                 struct fib_nh *nh;
605
606                 nh = container_of(nhc, struct fib_nh, nh_common);
607                 *itag = nh->nh_tclassid << 16;
608         } else {
609                 *itag = 0;
610         }
611
612 #ifdef CONFIG_IP_MULTIPLE_TABLES
613         rtag = res->tclassid;
614         if (*itag == 0)
615                 *itag = (rtag<<16);
616         *itag |= (rtag>>16);
617 #endif
618 #endif
619 }
620
621 void fib_flush(struct net *net);
622 void free_fib_info(struct fib_info *fi);
623
624 static inline void fib_info_hold(struct fib_info *fi)
625 {
626         refcount_inc(&fi->fib_clntref);
627 }
628
629 static inline void fib_info_put(struct fib_info *fi)
630 {
631         if (refcount_dec_and_test(&fi->fib_clntref))
632                 free_fib_info(fi);
633 }
634
635 #ifdef CONFIG_PROC_FS
636 int __net_init fib_proc_init(struct net *net);
637 void __net_exit fib_proc_exit(struct net *net);
638 #else
639 static inline int fib_proc_init(struct net *net)
640 {
641         return 0;
642 }
643 static inline void fib_proc_exit(struct net *net)
644 {
645 }
646 #endif
647
648 u32 ip_mtu_from_fib_result(struct fib_result *res, __be32 daddr);
649
650 int ip_valid_fib_dump_req(struct net *net, const struct nlmsghdr *nlh,
651                           struct fib_dump_filter *filter,
652                           struct netlink_callback *cb);
653
654 int fib_nexthop_info(struct sk_buff *skb, const struct fib_nh_common *nh,
655                      u8 rt_family, unsigned char *flags, bool skip_oif);
656 int fib_add_nexthop(struct sk_buff *skb, const struct fib_nh_common *nh,
657                     int nh_weight, u8 rt_family, u32 nh_tclassid);
658 #endif  /* _NET_FIB_H */
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