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
fib_get_table(struct net * net,u32 id)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 /* Only fib4_rules_init() adds fib_table. */
306 tb_hlist = rcu_dereference_protected(hlist_first_rcu(ptr), true);
307
308 return hlist_entry(tb_hlist, struct fib_table, tb_hlist);
309 }
310
fib_new_table(struct net * net,u32 id)311 static inline struct fib_table *fib_new_table(struct net *net, u32 id)
312 {
313 return fib_get_table(net, id);
314 }
315
fib_lookup(struct net * net,const struct flowi4 * flp,struct fib_result * res,unsigned int flags)316 static 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
fib4_has_custom_rules(const struct net * net)336 static inline bool fib4_has_custom_rules(const struct net *net)
337 {
338 return false;
339 }
340
fib4_rule_default(const struct fib_rule * rule)341 static inline bool fib4_rule_default(const struct fib_rule *rule)
342 {
343 return true;
344 }
345
fib4_rules_dump(struct net * net,struct notifier_block * nb,struct netlink_ext_ack * extack)346 static inline int fib4_rules_dump(struct net *net, struct notifier_block *nb,
347 struct netlink_ext_ack *extack)
348 {
349 return 0;
350 }
351
fib4_rules_seq_read(const struct net * net)352 static inline unsigned int fib4_rules_seq_read(const struct net *net)
353 {
354 return 0;
355 }
356
fib4_rules_early_flow_dissect(struct net * net,struct sk_buff * skb,struct flowi4 * fl4,struct flow_keys * flkeys)357 static 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 */
365 int __net_init fib4_rules_init(struct net *net);
366 void __net_exit fib4_rules_exit(struct net *net);
367
368 struct fib_table *fib_new_table(struct net *net, u32 id);
369 struct fib_table *fib_get_table(struct net *net, u32 id);
370
371 int __fib_lookup(struct net *net, struct flowi4 *flp,
372 struct fib_result *res, unsigned int flags);
373
fib_lookup(struct net * net,struct flowi4 * flp,struct fib_result * res,unsigned int flags)374 static 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 = -EAGAIN;
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 != -EAGAIN)
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
399 if (err == -EAGAIN)
400 err = -ENETUNREACH;
401 out:
402 rcu_read_unlock();
403
404 return err;
405 }
406
fib4_has_custom_rules(const struct net * net)407 static inline bool fib4_has_custom_rules(const struct net *net)
408 {
409 return net->ipv4.fib_has_custom_rules;
410 }
411
412 bool fib4_rule_default(const struct fib_rule *rule);
413 int fib4_rules_dump(struct net *net, struct notifier_block *nb,
414 struct netlink_ext_ack *extack);
415 unsigned int fib4_rules_seq_read(const struct net *net);
416
fib4_rules_early_flow_dissect(struct net * net,struct sk_buff * skb,struct flowi4 * fl4,struct flow_keys * flkeys)417 static inline bool fib4_rules_early_flow_dissect(struct net *net,
418 struct sk_buff *skb,
419 struct flowi4 *fl4,
420 struct flow_keys *flkeys)
421 {
422 unsigned int flag = FLOW_DISSECTOR_F_STOP_AT_ENCAP;
423
424 if (!net->ipv4.fib_rules_require_fldissect)
425 return false;
426
427 memset(flkeys, 0, sizeof(*flkeys));
428 __skb_flow_dissect(net, skb, &flow_keys_dissector,
429 flkeys, NULL, 0, 0, 0, flag);
430
431 fl4->fl4_sport = flkeys->ports.src;
432 fl4->fl4_dport = flkeys->ports.dst;
433 fl4->flowi4_proto = flkeys->basic.ip_proto;
434
435 return true;
436 }
437
438 #endif /* CONFIG_IP_MULTIPLE_TABLES */
439
fib_dscp_masked_match(dscp_t dscp,const struct flowi4 * fl4)440 static inline bool fib_dscp_masked_match(dscp_t dscp, const struct flowi4 *fl4)
441 {
442 return dscp == (fl4->flowi4_dscp & INET_DSCP_LEGACY_TOS_MASK);
443 }
444
445 /* Exported by fib_frontend.c */
446 extern const struct nla_policy rtm_ipv4_policy[];
447 void ip_fib_init(void);
448 int fib_gw_from_via(struct fib_config *cfg, struct nlattr *nla,
449 struct netlink_ext_ack *extack);
450 __be32 fib_compute_spec_dst(struct sk_buff *skb);
451 bool fib_info_nh_uses_dev(struct fib_info *fi, const struct net_device *dev);
452 int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst,
453 dscp_t dscp, int oif, struct net_device *dev,
454 struct in_device *idev, u32 *itag);
455
456 static inline enum skb_drop_reason
fib_validate_source_reason(struct sk_buff * skb,__be32 src,__be32 dst,dscp_t dscp,int oif,struct net_device * dev,struct in_device * idev,u32 * itag)457 fib_validate_source_reason(struct sk_buff *skb, __be32 src, __be32 dst,
458 dscp_t dscp, int oif, struct net_device *dev,
459 struct in_device *idev, u32 *itag)
460 {
461 int err = fib_validate_source(skb, src, dst, dscp, oif, dev, idev,
462 itag);
463 if (err < 0)
464 return -err;
465 return SKB_NOT_DROPPED_YET;
466 }
467
468 #ifdef CONFIG_IP_ROUTE_CLASSID
fib_num_tclassid_users(struct net * net)469 static inline int fib_num_tclassid_users(struct net *net)
470 {
471 return atomic_read(&net->ipv4.fib_num_tclassid_users);
472 }
473 #else
fib_num_tclassid_users(struct net * net)474 static inline int fib_num_tclassid_users(struct net *net)
475 {
476 return 0;
477 }
478 #endif
479 int fib_unmerge(struct net *net);
480
nhc_l3mdev_matches_dev(const struct fib_nh_common * nhc,const struct net_device * dev)481 static inline bool nhc_l3mdev_matches_dev(const struct fib_nh_common *nhc,
482 const struct net_device *dev)
483 {
484 if (nhc->nhc_dev == dev ||
485 l3mdev_master_ifindex_rcu(nhc->nhc_dev) == dev->ifindex)
486 return true;
487
488 return false;
489 }
490
491 /* Exported by fib_semantics.c */
492 int ip_fib_check_default(__be32 gw, struct net_device *dev);
493 int fib_sync_down_dev(struct net_device *dev, unsigned long event, bool force);
494 int fib_sync_down_addr(struct net_device *dev, __be32 local);
495 int fib_sync_up(struct net_device *dev, unsigned char nh_flags);
496 void fib_sync_mtu(struct net_device *dev, u32 orig_mtu);
497 void fib_nhc_update_mtu(struct fib_nh_common *nhc, u32 new, u32 orig);
498
499 /* Fields used for sysctl_fib_multipath_hash_fields.
500 * Common to IPv4 and IPv6.
501 *
502 * Add new fields at the end. This is user API.
503 */
504 #define FIB_MULTIPATH_HASH_FIELD_SRC_IP BIT(0)
505 #define FIB_MULTIPATH_HASH_FIELD_DST_IP BIT(1)
506 #define FIB_MULTIPATH_HASH_FIELD_IP_PROTO BIT(2)
507 #define FIB_MULTIPATH_HASH_FIELD_FLOWLABEL BIT(3)
508 #define FIB_MULTIPATH_HASH_FIELD_SRC_PORT BIT(4)
509 #define FIB_MULTIPATH_HASH_FIELD_DST_PORT BIT(5)
510 #define FIB_MULTIPATH_HASH_FIELD_INNER_SRC_IP BIT(6)
511 #define FIB_MULTIPATH_HASH_FIELD_INNER_DST_IP BIT(7)
512 #define FIB_MULTIPATH_HASH_FIELD_INNER_IP_PROTO BIT(8)
513 #define FIB_MULTIPATH_HASH_FIELD_INNER_FLOWLABEL BIT(9)
514 #define FIB_MULTIPATH_HASH_FIELD_INNER_SRC_PORT BIT(10)
515 #define FIB_MULTIPATH_HASH_FIELD_INNER_DST_PORT BIT(11)
516
517 #define FIB_MULTIPATH_HASH_FIELD_OUTER_MASK \
518 (FIB_MULTIPATH_HASH_FIELD_SRC_IP | \
519 FIB_MULTIPATH_HASH_FIELD_DST_IP | \
520 FIB_MULTIPATH_HASH_FIELD_IP_PROTO | \
521 FIB_MULTIPATH_HASH_FIELD_FLOWLABEL | \
522 FIB_MULTIPATH_HASH_FIELD_SRC_PORT | \
523 FIB_MULTIPATH_HASH_FIELD_DST_PORT)
524
525 #define FIB_MULTIPATH_HASH_FIELD_INNER_MASK \
526 (FIB_MULTIPATH_HASH_FIELD_INNER_SRC_IP | \
527 FIB_MULTIPATH_HASH_FIELD_INNER_DST_IP | \
528 FIB_MULTIPATH_HASH_FIELD_INNER_IP_PROTO | \
529 FIB_MULTIPATH_HASH_FIELD_INNER_FLOWLABEL | \
530 FIB_MULTIPATH_HASH_FIELD_INNER_SRC_PORT | \
531 FIB_MULTIPATH_HASH_FIELD_INNER_DST_PORT)
532
533 #define FIB_MULTIPATH_HASH_FIELD_ALL_MASK \
534 (FIB_MULTIPATH_HASH_FIELD_OUTER_MASK | \
535 FIB_MULTIPATH_HASH_FIELD_INNER_MASK)
536
537 #define FIB_MULTIPATH_HASH_FIELD_DEFAULT_MASK \
538 (FIB_MULTIPATH_HASH_FIELD_SRC_IP | \
539 FIB_MULTIPATH_HASH_FIELD_DST_IP | \
540 FIB_MULTIPATH_HASH_FIELD_IP_PROTO)
541
542 #ifdef CONFIG_IP_ROUTE_MULTIPATH
543 int fib_multipath_hash(const struct net *net, const struct flowi4 *fl4,
544 const struct sk_buff *skb, struct flow_keys *flkeys);
545
546 static void
fib_multipath_hash_construct_key(siphash_key_t * key,u32 mp_seed)547 fib_multipath_hash_construct_key(siphash_key_t *key, u32 mp_seed)
548 {
549 u64 mp_seed_64 = mp_seed;
550
551 key->key[0] = (mp_seed_64 << 32) | mp_seed_64;
552 key->key[1] = key->key[0];
553 }
554
fib_multipath_hash_from_keys(const struct net * net,struct flow_keys * keys)555 static inline u32 fib_multipath_hash_from_keys(const struct net *net,
556 struct flow_keys *keys)
557 {
558 siphash_aligned_key_t hash_key;
559 u32 mp_seed;
560
561 mp_seed = READ_ONCE(net->ipv4.sysctl_fib_multipath_hash_seed.mp_seed);
562 fib_multipath_hash_construct_key(&hash_key, mp_seed);
563
564 return flow_hash_from_keys_seed(keys, &hash_key);
565 }
566 #else
fib_multipath_hash_from_keys(const struct net * net,struct flow_keys * keys)567 static inline u32 fib_multipath_hash_from_keys(const struct net *net,
568 struct flow_keys *keys)
569 {
570 return flow_hash_from_keys(keys);
571 }
572 #endif
573
574 int fib_check_nh(struct net *net, struct fib_nh *nh, u32 table, u8 scope,
575 struct netlink_ext_ack *extack);
576 void fib_select_multipath(struct fib_result *res, int hash,
577 const struct flowi4 *fl4);
578 void fib_select_path(struct net *net, struct fib_result *res,
579 struct flowi4 *fl4, const struct sk_buff *skb);
580
581 int fib_nh_init(struct net *net, struct fib_nh *fib_nh,
582 struct fib_config *cfg, int nh_weight,
583 struct netlink_ext_ack *extack);
584 void fib_nh_release(struct net *net, struct fib_nh *fib_nh);
585 int fib_nh_common_init(struct net *net, struct fib_nh_common *nhc,
586 struct nlattr *fc_encap, u16 fc_encap_type,
587 void *cfg, gfp_t gfp_flags,
588 struct netlink_ext_ack *extack);
589 void fib_nh_common_release(struct fib_nh_common *nhc);
590
591 /* Exported by fib_trie.c */
592 void fib_alias_hw_flags_set(struct net *net, const struct fib_rt_info *fri);
593 void fib_trie_init(void);
594 struct fib_table *fib_trie_table(u32 id, struct fib_table *alias);
595 bool fib_lookup_good_nhc(const struct fib_nh_common *nhc, int fib_flags,
596 const struct flowi4 *flp);
597
fib_combine_itag(u32 * itag,const struct fib_result * res)598 static inline void fib_combine_itag(u32 *itag, const struct fib_result *res)
599 {
600 #ifdef CONFIG_IP_ROUTE_CLASSID
601 struct fib_nh_common *nhc = res->nhc;
602 #ifdef CONFIG_IP_MULTIPLE_TABLES
603 u32 rtag;
604 #endif
605 if (nhc->nhc_family == AF_INET) {
606 struct fib_nh *nh;
607
608 nh = container_of(nhc, struct fib_nh, nh_common);
609 *itag = nh->nh_tclassid << 16;
610 } else {
611 *itag = 0;
612 }
613
614 #ifdef CONFIG_IP_MULTIPLE_TABLES
615 rtag = res->tclassid;
616 if (*itag == 0)
617 *itag = (rtag<<16);
618 *itag |= (rtag>>16);
619 #endif
620 #endif
621 }
622
623 void fib_flush(struct net *net);
624 void free_fib_info(struct fib_info *fi);
625
fib_info_hold(struct fib_info * fi)626 static inline void fib_info_hold(struct fib_info *fi)
627 {
628 refcount_inc(&fi->fib_clntref);
629 }
630
fib_info_hold_safe(struct fib_info * fi)631 static inline bool fib_info_hold_safe(struct fib_info *fi)
632 {
633 return refcount_inc_not_zero(&fi->fib_clntref);
634 }
635
fib_info_put(struct fib_info * fi)636 static inline void fib_info_put(struct fib_info *fi)
637 {
638 if (refcount_dec_and_test(&fi->fib_clntref))
639 free_fib_info(fi);
640 }
641
642 #ifdef CONFIG_PROC_FS
643 int __net_init fib_proc_init(struct net *net);
644 void __net_exit fib_proc_exit(struct net *net);
645 #else
fib_proc_init(struct net * net)646 static inline int fib_proc_init(struct net *net)
647 {
648 return 0;
649 }
fib_proc_exit(struct net * net)650 static inline void fib_proc_exit(struct net *net)
651 {
652 }
653 #endif
654
655 u32 ip_mtu_from_fib_result(struct fib_result *res, __be32 daddr);
656
657 int ip_valid_fib_dump_req(struct net *net, const struct nlmsghdr *nlh,
658 struct fib_dump_filter *filter,
659 struct netlink_callback *cb);
660
661 int fib_nexthop_info(struct sk_buff *skb, const struct fib_nh_common *nh,
662 u8 rt_family, unsigned char *flags, bool skip_oif);
663 int fib_add_nexthop(struct sk_buff *skb, const struct fib_nh_common *nh,
664 int nh_weight, u8 rt_family, u32 nh_tclassid);
665 #endif /* _NET_FIB_H */
666