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 | struct fib_nh_common *nhc; |
177 | struct fib_info *fi; |
178 | struct fib_table *table; |
179 | struct hlist_head *fa_head; |
180 | }; |
181 | |
182 | struct fib_result_nl { |
183 | __be32 fl_addr; /* To be looked up*/ |
184 | u32 fl_mark; |
185 | unsigned char fl_tos; |
186 | unsigned char fl_scope; |
187 | unsigned char tb_id_in; |
188 | |
189 | unsigned char tb_id; /* Results */ |
190 | unsigned char prefixlen; |
191 | unsigned char nh_sel; |
192 | unsigned char type; |
193 | unsigned char scope; |
194 | int err; |
195 | }; |
196 | |
197 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
198 | #define FIB_TABLE_HASHSZ 256 |
199 | #else |
200 | #define FIB_TABLE_HASHSZ 2 |
201 | #endif |
202 | |
203 | __be32 fib_info_update_nhc_saddr(struct net *net, struct fib_nh_common *nhc, |
204 | unsigned char scope); |
205 | __be32 fib_result_prefsrc(struct net *net, struct fib_result *res); |
206 | |
207 | #define FIB_RES_NHC(res) ((res).nhc) |
208 | #define FIB_RES_DEV(res) (FIB_RES_NHC(res)->nhc_dev) |
209 | #define FIB_RES_OIF(res) (FIB_RES_NHC(res)->nhc_oif) |
210 | |
211 | struct fib_rt_info { |
212 | struct fib_info *fi; |
213 | u32 tb_id; |
214 | __be32 dst; |
215 | int dst_len; |
216 | dscp_t dscp; |
217 | u8 type; |
218 | u8 offload:1, |
219 | trap:1, |
220 | offload_failed:1, |
221 | unused:5; |
222 | }; |
223 | |
224 | struct fib_entry_notifier_info { |
225 | struct fib_notifier_info info; /* must be first */ |
226 | u32 dst; |
227 | int dst_len; |
228 | struct fib_info *fi; |
229 | dscp_t dscp; |
230 | u8 type; |
231 | u32 tb_id; |
232 | }; |
233 | |
234 | struct fib_nh_notifier_info { |
235 | struct fib_notifier_info info; /* must be first */ |
236 | struct fib_nh *fib_nh; |
237 | }; |
238 | |
239 | int call_fib4_notifier(struct notifier_block *nb, |
240 | enum fib_event_type event_type, |
241 | struct fib_notifier_info *info); |
242 | int call_fib4_notifiers(struct net *net, enum fib_event_type event_type, |
243 | struct fib_notifier_info *info); |
244 | |
245 | int __net_init fib4_notifier_init(struct net *net); |
246 | void __net_exit fib4_notifier_exit(struct net *net); |
247 | |
248 | void fib_info_notify_update(struct net *net, struct nl_info *info); |
249 | int fib_notify(struct net *net, struct notifier_block *nb, |
250 | struct netlink_ext_ack *extack); |
251 | |
252 | struct fib_table { |
253 | struct hlist_node tb_hlist; |
254 | u32 tb_id; |
255 | int tb_num_default; |
256 | struct rcu_head rcu; |
257 | unsigned long *tb_data; |
258 | unsigned long __data[]; |
259 | }; |
260 | |
261 | struct fib_dump_filter { |
262 | u32 table_id; |
263 | /* filter_set is an optimization that an entry is set */ |
264 | bool filter_set; |
265 | bool dump_routes; |
266 | bool dump_exceptions; |
267 | bool rtnl_held; |
268 | unsigned char protocol; |
269 | unsigned char rt_type; |
270 | unsigned int flags; |
271 | struct net_device *dev; |
272 | }; |
273 | |
274 | int fib_table_lookup(struct fib_table *tb, const struct flowi4 *flp, |
275 | struct fib_result *res, int fib_flags); |
276 | int fib_table_insert(struct net *, struct fib_table *, struct fib_config *, |
277 | struct netlink_ext_ack *extack); |
278 | int fib_table_delete(struct net *, struct fib_table *, struct fib_config *, |
279 | struct netlink_ext_ack *extack); |
280 | int fib_table_dump(struct fib_table *table, struct sk_buff *skb, |
281 | struct netlink_callback *cb, struct fib_dump_filter *filter); |
282 | int fib_table_flush(struct net *net, struct fib_table *table, bool flush_all); |
283 | struct fib_table *fib_trie_unmerge(struct fib_table *main_tb); |
284 | void fib_table_flush_external(struct fib_table *table); |
285 | void fib_free_table(struct fib_table *tb); |
286 | |
287 | #ifndef CONFIG_IP_MULTIPLE_TABLES |
288 | |
289 | #define TABLE_LOCAL_INDEX (RT_TABLE_LOCAL & (FIB_TABLE_HASHSZ - 1)) |
290 | #define TABLE_MAIN_INDEX (RT_TABLE_MAIN & (FIB_TABLE_HASHSZ - 1)) |
291 | |
292 | static inline struct fib_table *fib_get_table(struct net *net, u32 id) |
293 | { |
294 | struct hlist_node *tb_hlist; |
295 | struct hlist_head *ptr; |
296 | |
297 | ptr = id == RT_TABLE_LOCAL ? |
298 | &net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX] : |
299 | &net->ipv4.fib_table_hash[TABLE_MAIN_INDEX]; |
300 | |
301 | tb_hlist = rcu_dereference_rtnl(hlist_first_rcu(ptr)); |
302 | |
303 | return hlist_entry(tb_hlist, struct fib_table, tb_hlist); |
304 | } |
305 | |
306 | static inline struct fib_table *fib_new_table(struct net *net, u32 id) |
307 | { |
308 | return fib_get_table(net, id); |
309 | } |
310 | |
311 | static inline int fib_lookup(struct net *net, const struct flowi4 *flp, |
312 | struct fib_result *res, unsigned int flags) |
313 | { |
314 | struct fib_table *tb; |
315 | int err = -ENETUNREACH; |
316 | |
317 | rcu_read_lock(); |
318 | |
319 | tb = fib_get_table(net, RT_TABLE_MAIN); |
320 | if (tb) |
321 | err = fib_table_lookup(tb, flp, res, flags | FIB_LOOKUP_NOREF); |
322 | |
323 | if (err == -EAGAIN) |
324 | err = -ENETUNREACH; |
325 | |
326 | rcu_read_unlock(); |
327 | |
328 | return err; |
329 | } |
330 | |
331 | static inline bool fib4_has_custom_rules(const struct net *net) |
332 | { |
333 | return false; |
334 | } |
335 | |
336 | static inline bool fib4_rule_default(const struct fib_rule *rule) |
337 | { |
338 | return true; |
339 | } |
340 | |
341 | static inline int fib4_rules_dump(struct net *net, struct notifier_block *nb, |
342 | struct netlink_ext_ack *extack) |
343 | { |
344 | return 0; |
345 | } |
346 | |
347 | static inline unsigned int fib4_rules_seq_read(struct net *net) |
348 | { |
349 | return 0; |
350 | } |
351 | |
352 | static inline bool fib4_rules_early_flow_dissect(struct net *net, |
353 | struct sk_buff *skb, |
354 | struct flowi4 *fl4, |
355 | struct flow_keys *flkeys) |
356 | { |
357 | return false; |
358 | } |
359 | #else /* CONFIG_IP_MULTIPLE_TABLES */ |
360 | int __net_init fib4_rules_init(struct net *net); |
361 | void __net_exit fib4_rules_exit(struct net *net); |
362 | |
363 | struct fib_table *fib_new_table(struct net *net, u32 id); |
364 | struct fib_table *fib_get_table(struct net *net, u32 id); |
365 | |
366 | int __fib_lookup(struct net *net, struct flowi4 *flp, |
367 | struct fib_result *res, unsigned int flags); |
368 | |
369 | static inline int fib_lookup(struct net *net, struct flowi4 *flp, |
370 | struct fib_result *res, unsigned int flags) |
371 | { |
372 | struct fib_table *tb; |
373 | int err = -ENETUNREACH; |
374 | |
375 | flags |= FIB_LOOKUP_NOREF; |
376 | if (net->ipv4.fib_has_custom_rules) |
377 | return __fib_lookup(net, flp, res, flags); |
378 | |
379 | rcu_read_lock(); |
380 | |
381 | res->tclassid = 0; |
382 | |
383 | tb = rcu_dereference_rtnl(net->ipv4.fib_main); |
384 | if (tb) |
385 | err = fib_table_lookup(tb, flp, res, fib_flags: flags); |
386 | |
387 | if (!err) |
388 | goto out; |
389 | |
390 | tb = rcu_dereference_rtnl(net->ipv4.fib_default); |
391 | if (tb) |
392 | err = fib_table_lookup(tb, flp, res, fib_flags: flags); |
393 | |
394 | out: |
395 | if (err == -EAGAIN) |
396 | err = -ENETUNREACH; |
397 | |
398 | rcu_read_unlock(); |
399 | |
400 | return err; |
401 | } |
402 | |
403 | static inline bool fib4_has_custom_rules(const struct net *net) |
404 | { |
405 | return net->ipv4.fib_has_custom_rules; |
406 | } |
407 | |
408 | bool fib4_rule_default(const struct fib_rule *rule); |
409 | int fib4_rules_dump(struct net *net, struct notifier_block *nb, |
410 | struct netlink_ext_ack *extack); |
411 | unsigned int fib4_rules_seq_read(struct net *net); |
412 | |
413 | static inline bool fib4_rules_early_flow_dissect(struct net *net, |
414 | struct sk_buff *skb, |
415 | struct flowi4 *fl4, |
416 | struct flow_keys *flkeys) |
417 | { |
418 | unsigned int flag = FLOW_DISSECTOR_F_STOP_AT_ENCAP; |
419 | |
420 | if (!net->ipv4.fib_rules_require_fldissect) |
421 | return false; |
422 | |
423 | memset(flkeys, 0, sizeof(*flkeys)); |
424 | __skb_flow_dissect(net, skb, flow_dissector: &flow_keys_dissector, |
425 | target_container: flkeys, NULL, proto: 0, nhoff: 0, hlen: 0, flags: flag); |
426 | |
427 | fl4->fl4_sport = flkeys->ports.src; |
428 | fl4->fl4_dport = flkeys->ports.dst; |
429 | fl4->flowi4_proto = flkeys->basic.ip_proto; |
430 | |
431 | return true; |
432 | } |
433 | |
434 | #endif /* CONFIG_IP_MULTIPLE_TABLES */ |
435 | |
436 | /* Exported by fib_frontend.c */ |
437 | extern const struct nla_policy rtm_ipv4_policy[]; |
438 | void ip_fib_init(void); |
439 | int fib_gw_from_via(struct fib_config *cfg, struct nlattr *nla, |
440 | struct netlink_ext_ack *extack); |
441 | __be32 fib_compute_spec_dst(struct sk_buff *skb); |
442 | bool fib_info_nh_uses_dev(struct fib_info *fi, const struct net_device *dev); |
443 | int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst, |
444 | u8 tos, int oif, struct net_device *dev, |
445 | struct in_device *idev, u32 *itag); |
446 | #ifdef CONFIG_IP_ROUTE_CLASSID |
447 | static inline int fib_num_tclassid_users(struct net *net) |
448 | { |
449 | return atomic_read(v: &net->ipv4.fib_num_tclassid_users); |
450 | } |
451 | #else |
452 | static inline int fib_num_tclassid_users(struct net *net) |
453 | { |
454 | return 0; |
455 | } |
456 | #endif |
457 | int fib_unmerge(struct net *net); |
458 | |
459 | static inline bool nhc_l3mdev_matches_dev(const struct fib_nh_common *nhc, |
460 | const struct net_device *dev) |
461 | { |
462 | if (nhc->nhc_dev == dev || |
463 | l3mdev_master_ifindex_rcu(dev: nhc->nhc_dev) == dev->ifindex) |
464 | return true; |
465 | |
466 | return false; |
467 | } |
468 | |
469 | /* Exported by fib_semantics.c */ |
470 | int ip_fib_check_default(__be32 gw, struct net_device *dev); |
471 | int fib_sync_down_dev(struct net_device *dev, unsigned long event, bool force); |
472 | int fib_sync_down_addr(struct net_device *dev, __be32 local); |
473 | int fib_sync_up(struct net_device *dev, unsigned char nh_flags); |
474 | void fib_sync_mtu(struct net_device *dev, u32 orig_mtu); |
475 | void fib_nhc_update_mtu(struct fib_nh_common *nhc, u32 new, u32 orig); |
476 | |
477 | /* Fields used for sysctl_fib_multipath_hash_fields. |
478 | * Common to IPv4 and IPv6. |
479 | * |
480 | * Add new fields at the end. This is user API. |
481 | */ |
482 | #define FIB_MULTIPATH_HASH_FIELD_SRC_IP BIT(0) |
483 | #define FIB_MULTIPATH_HASH_FIELD_DST_IP BIT(1) |
484 | #define FIB_MULTIPATH_HASH_FIELD_IP_PROTO BIT(2) |
485 | #define FIB_MULTIPATH_HASH_FIELD_FLOWLABEL BIT(3) |
486 | #define FIB_MULTIPATH_HASH_FIELD_SRC_PORT BIT(4) |
487 | #define FIB_MULTIPATH_HASH_FIELD_DST_PORT BIT(5) |
488 | #define FIB_MULTIPATH_HASH_FIELD_INNER_SRC_IP BIT(6) |
489 | #define FIB_MULTIPATH_HASH_FIELD_INNER_DST_IP BIT(7) |
490 | #define FIB_MULTIPATH_HASH_FIELD_INNER_IP_PROTO BIT(8) |
491 | #define FIB_MULTIPATH_HASH_FIELD_INNER_FLOWLABEL BIT(9) |
492 | #define FIB_MULTIPATH_HASH_FIELD_INNER_SRC_PORT BIT(10) |
493 | #define FIB_MULTIPATH_HASH_FIELD_INNER_DST_PORT BIT(11) |
494 | |
495 | #define FIB_MULTIPATH_HASH_FIELD_OUTER_MASK \ |
496 | (FIB_MULTIPATH_HASH_FIELD_SRC_IP | \ |
497 | FIB_MULTIPATH_HASH_FIELD_DST_IP | \ |
498 | FIB_MULTIPATH_HASH_FIELD_IP_PROTO | \ |
499 | FIB_MULTIPATH_HASH_FIELD_FLOWLABEL | \ |
500 | FIB_MULTIPATH_HASH_FIELD_SRC_PORT | \ |
501 | FIB_MULTIPATH_HASH_FIELD_DST_PORT) |
502 | |
503 | #define FIB_MULTIPATH_HASH_FIELD_INNER_MASK \ |
504 | (FIB_MULTIPATH_HASH_FIELD_INNER_SRC_IP | \ |
505 | FIB_MULTIPATH_HASH_FIELD_INNER_DST_IP | \ |
506 | FIB_MULTIPATH_HASH_FIELD_INNER_IP_PROTO | \ |
507 | FIB_MULTIPATH_HASH_FIELD_INNER_FLOWLABEL | \ |
508 | FIB_MULTIPATH_HASH_FIELD_INNER_SRC_PORT | \ |
509 | FIB_MULTIPATH_HASH_FIELD_INNER_DST_PORT) |
510 | |
511 | #define FIB_MULTIPATH_HASH_FIELD_ALL_MASK \ |
512 | (FIB_MULTIPATH_HASH_FIELD_OUTER_MASK | \ |
513 | FIB_MULTIPATH_HASH_FIELD_INNER_MASK) |
514 | |
515 | #define FIB_MULTIPATH_HASH_FIELD_DEFAULT_MASK \ |
516 | (FIB_MULTIPATH_HASH_FIELD_SRC_IP | \ |
517 | FIB_MULTIPATH_HASH_FIELD_DST_IP | \ |
518 | FIB_MULTIPATH_HASH_FIELD_IP_PROTO) |
519 | |
520 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
521 | int fib_multipath_hash(const struct net *net, const struct flowi4 *fl4, |
522 | const struct sk_buff *skb, struct flow_keys *flkeys); |
523 | #endif |
524 | int fib_check_nh(struct net *net, struct fib_nh *nh, u32 table, u8 scope, |
525 | struct netlink_ext_ack *extack); |
526 | void fib_select_multipath(struct fib_result *res, int hash); |
527 | void fib_select_path(struct net *net, struct fib_result *res, |
528 | struct flowi4 *fl4, const struct sk_buff *skb); |
529 | |
530 | int fib_nh_init(struct net *net, struct fib_nh *fib_nh, |
531 | struct fib_config *cfg, int nh_weight, |
532 | struct netlink_ext_ack *extack); |
533 | void fib_nh_release(struct net *net, struct fib_nh *fib_nh); |
534 | int fib_nh_common_init(struct net *net, struct fib_nh_common *nhc, |
535 | struct nlattr *fc_encap, u16 fc_encap_type, |
536 | void *cfg, gfp_t gfp_flags, |
537 | struct netlink_ext_ack *extack); |
538 | void fib_nh_common_release(struct fib_nh_common *nhc); |
539 | |
540 | /* Exported by fib_trie.c */ |
541 | void fib_alias_hw_flags_set(struct net *net, const struct fib_rt_info *fri); |
542 | void fib_trie_init(void); |
543 | struct fib_table *fib_trie_table(u32 id, struct fib_table *alias); |
544 | bool fib_lookup_good_nhc(const struct fib_nh_common *nhc, int fib_flags, |
545 | const struct flowi4 *flp); |
546 | |
547 | static inline void fib_combine_itag(u32 *itag, const struct fib_result *res) |
548 | { |
549 | #ifdef CONFIG_IP_ROUTE_CLASSID |
550 | struct fib_nh_common *nhc = res->nhc; |
551 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
552 | u32 rtag; |
553 | #endif |
554 | if (nhc->nhc_family == AF_INET) { |
555 | struct fib_nh *nh; |
556 | |
557 | nh = container_of(nhc, struct fib_nh, nh_common); |
558 | *itag = nh->nh_tclassid << 16; |
559 | } else { |
560 | *itag = 0; |
561 | } |
562 | |
563 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
564 | rtag = res->tclassid; |
565 | if (*itag == 0) |
566 | *itag = (rtag<<16); |
567 | *itag |= (rtag>>16); |
568 | #endif |
569 | #endif |
570 | } |
571 | |
572 | void fib_flush(struct net *net); |
573 | void free_fib_info(struct fib_info *fi); |
574 | |
575 | static inline void fib_info_hold(struct fib_info *fi) |
576 | { |
577 | refcount_inc(r: &fi->fib_clntref); |
578 | } |
579 | |
580 | static inline void fib_info_put(struct fib_info *fi) |
581 | { |
582 | if (refcount_dec_and_test(r: &fi->fib_clntref)) |
583 | free_fib_info(fi); |
584 | } |
585 | |
586 | #ifdef CONFIG_PROC_FS |
587 | int __net_init fib_proc_init(struct net *net); |
588 | void __net_exit fib_proc_exit(struct net *net); |
589 | #else |
590 | static inline int fib_proc_init(struct net *net) |
591 | { |
592 | return 0; |
593 | } |
594 | static inline void fib_proc_exit(struct net *net) |
595 | { |
596 | } |
597 | #endif |
598 | |
599 | u32 ip_mtu_from_fib_result(struct fib_result *res, __be32 daddr); |
600 | |
601 | int ip_valid_fib_dump_req(struct net *net, const struct nlmsghdr *nlh, |
602 | struct fib_dump_filter *filter, |
603 | struct netlink_callback *cb); |
604 | |
605 | int fib_nexthop_info(struct sk_buff *skb, const struct fib_nh_common *nh, |
606 | u8 rt_family, unsigned char *flags, bool skip_oif); |
607 | int fib_add_nexthop(struct sk_buff *skb, const struct fib_nh_common *nh, |
608 | int nh_weight, u8 rt_family, u32 nh_tclassid); |
609 | #endif /* _NET_FIB_H */ |
610 | |