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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/inetpeer.h>
21#include <linux/percpu.h>
22#include <linux/notifier.h>
23#include <linux/refcount.h>
24
25struct fib_config {
26 u8 fc_dst_len;
27 u8 fc_tos;
28 u8 fc_protocol;
29 u8 fc_scope;
30 u8 fc_type;
31 u8 fc_gw_family;
32 /* 2 bytes unused */
33 u32 fc_table;
34 __be32 fc_dst;
35 union {
36 __be32 fc_gw4;
37 struct in6_addr fc_gw6;
38 };
39 int fc_oif;
40 u32 fc_flags;
41 u32 fc_priority;
42 __be32 fc_prefsrc;
43 u32 fc_nh_id;
44 struct nlattr *fc_mx;
45 struct rtnexthop *fc_mp;
46 int fc_mx_len;
47 int fc_mp_len;
48 u32 fc_flow;
49 u32 fc_nlflags;
50 struct nl_info fc_nlinfo;
51 struct nlattr *fc_encap;
52 u16 fc_encap_type;
53};
54
55struct fib_info;
56struct rtable;
57
58struct fib_nh_exception {
59 struct fib_nh_exception __rcu *fnhe_next;
60 int fnhe_genid;
61 __be32 fnhe_daddr;
62 u32 fnhe_pmtu;
63 bool fnhe_mtu_locked;
64 __be32 fnhe_gw;
65 unsigned long fnhe_expires;
66 struct rtable __rcu *fnhe_rth_input;
67 struct rtable __rcu *fnhe_rth_output;
68 unsigned long fnhe_stamp;
69 struct rcu_head rcu;
70};
71
72struct fnhe_hash_bucket {
73 struct fib_nh_exception __rcu *chain;
74};
75
76#define FNHE_HASH_SHIFT 11
77#define FNHE_HASH_SIZE (1 << FNHE_HASH_SHIFT)
78#define FNHE_RECLAIM_DEPTH 5
79
80struct fib_nh_common {
81 struct net_device *nhc_dev;
82 int nhc_oif;
83 unsigned char nhc_scope;
84 u8 nhc_family;
85 u8 nhc_gw_family;
86 unsigned char nhc_flags;
87 struct lwtunnel_state *nhc_lwtstate;
88
89 union {
90 __be32 ipv4;
91 struct in6_addr ipv6;
92 } nhc_gw;
93
94 int nhc_weight;
95 atomic_t nhc_upper_bound;
96
97 /* v4 specific, but allows fib6_nh with v4 routes */
98 struct rtable __rcu * __percpu *nhc_pcpu_rth_output;
99 struct rtable __rcu *nhc_rth_input;
100 struct fnhe_hash_bucket __rcu *nhc_exceptions;
101};
102
103struct fib_nh {
104 struct fib_nh_common nh_common;
105 struct hlist_node nh_hash;
106 struct fib_info *nh_parent;
107#ifdef CONFIG_IP_ROUTE_CLASSID
108 __u32 nh_tclassid;
109#endif
110 __be32 nh_saddr;
111 int nh_saddr_genid;
112#define fib_nh_family nh_common.nhc_family
113#define fib_nh_dev nh_common.nhc_dev
114#define fib_nh_oif nh_common.nhc_oif
115#define fib_nh_flags nh_common.nhc_flags
116#define fib_nh_lws nh_common.nhc_lwtstate
117#define fib_nh_scope nh_common.nhc_scope
118#define fib_nh_gw_family nh_common.nhc_gw_family
119#define fib_nh_gw4 nh_common.nhc_gw.ipv4
120#define fib_nh_gw6 nh_common.nhc_gw.ipv6
121#define fib_nh_weight nh_common.nhc_weight
122#define fib_nh_upper_bound nh_common.nhc_upper_bound
123};
124
125/*
126 * This structure contains data shared by many of routes.
127 */
128
129struct nexthop;
130
131struct fib_info {
132 struct hlist_node fib_hash;
133 struct hlist_node fib_lhash;
134 struct list_head nh_list;
135 struct net *fib_net;
136 int fib_treeref;
137 refcount_t fib_clntref;
138 unsigned int fib_flags;
139 unsigned char fib_dead;
140 unsigned char fib_protocol;
141 unsigned char fib_scope;
142 unsigned char fib_type;
143 __be32 fib_prefsrc;
144 u32 fib_tb_id;
145 u32 fib_priority;
146 struct dst_metrics *fib_metrics;
147#define fib_mtu fib_metrics->metrics[RTAX_MTU-1]
148#define fib_window fib_metrics->metrics[RTAX_WINDOW-1]
149#define fib_rtt fib_metrics->metrics[RTAX_RTT-1]
150#define fib_advmss fib_metrics->metrics[RTAX_ADVMSS-1]
151 int fib_nhs;
152 bool fib_nh_is_v6;
153 bool nh_updated;
154 struct nexthop *nh;
155 struct rcu_head rcu;
156 struct fib_nh fib_nh[0];
157};
158
159
160#ifdef CONFIG_IP_MULTIPLE_TABLES
161struct fib_rule;
162#endif
163
164struct fib_table;
165struct fib_result {
166 __be32 prefix;
167 unsigned char prefixlen;
168 unsigned char nh_sel;
169 unsigned char type;
170 unsigned char scope;
171 u32 tclassid;
172 struct fib_nh_common *nhc;
173 struct fib_info *fi;
174 struct fib_table *table;
175 struct hlist_head *fa_head;
176};
177
178struct fib_result_nl {
179 __be32 fl_addr; /* To be looked up*/
180 u32 fl_mark;
181 unsigned char fl_tos;
182 unsigned char fl_scope;
183 unsigned char tb_id_in;
184
185 unsigned char tb_id; /* Results */
186 unsigned char prefixlen;
187 unsigned char nh_sel;
188 unsigned char type;
189 unsigned char scope;
190 int err;
191};
192
193#ifdef CONFIG_IP_MULTIPLE_TABLES
194#define FIB_TABLE_HASHSZ 256
195#else
196#define FIB_TABLE_HASHSZ 2
197#endif
198
199__be32 fib_info_update_nhc_saddr(struct net *net, struct fib_nh_common *nhc,
200 unsigned char scope);
201__be32 fib_result_prefsrc(struct net *net, struct fib_result *res);
202
203#define FIB_RES_NHC(res) ((res).nhc)
204#define FIB_RES_DEV(res) (FIB_RES_NHC(res)->nhc_dev)
205#define FIB_RES_OIF(res) (FIB_RES_NHC(res)->nhc_oif)
206
207struct fib_entry_notifier_info {
208 struct fib_notifier_info info; /* must be first */
209 u32 dst;
210 int dst_len;
211 struct fib_info *fi;
212 u8 tos;
213 u8 type;
214 u32 tb_id;
215};
216
217struct fib_nh_notifier_info {
218 struct fib_notifier_info info; /* must be first */
219 struct fib_nh *fib_nh;
220};
221
222int call_fib4_notifier(struct notifier_block *nb, struct net *net,
223 enum fib_event_type event_type,
224 struct fib_notifier_info *info);
225int call_fib4_notifiers(struct net *net, enum fib_event_type event_type,
226 struct fib_notifier_info *info);
227
228int __net_init fib4_notifier_init(struct net *net);
229void __net_exit fib4_notifier_exit(struct net *net);
230
231void fib_info_notify_update(struct net *net, struct nl_info *info);
232void fib_notify(struct net *net, struct notifier_block *nb);
233
234struct fib_table {
235 struct hlist_node tb_hlist;
236 u32 tb_id;
237 int tb_num_default;
238 struct rcu_head rcu;
239 unsigned long *tb_data;
240 unsigned long __data[0];
241};
242
243struct fib_dump_filter {
244 u32 table_id;
245 /* filter_set is an optimization that an entry is set */
246 bool filter_set;
247 bool dump_all_families;
248 bool dump_routes;
249 bool dump_exceptions;
250 unsigned char protocol;
251 unsigned char rt_type;
252 unsigned int flags;
253 struct net_device *dev;
254};
255
256int fib_table_lookup(struct fib_table *tb, const struct flowi4 *flp,
257 struct fib_result *res, int fib_flags);
258int fib_table_insert(struct net *, struct fib_table *, struct fib_config *,
259 struct netlink_ext_ack *extack);
260int fib_table_delete(struct net *, struct fib_table *, struct fib_config *,
261 struct netlink_ext_ack *extack);
262int fib_table_dump(struct fib_table *table, struct sk_buff *skb,
263 struct netlink_callback *cb, struct fib_dump_filter *filter);
264int fib_table_flush(struct net *net, struct fib_table *table, bool flush_all);
265struct fib_table *fib_trie_unmerge(struct fib_table *main_tb);
266void fib_table_flush_external(struct fib_table *table);
267void fib_free_table(struct fib_table *tb);
268
269#ifndef CONFIG_IP_MULTIPLE_TABLES
270
271#define TABLE_LOCAL_INDEX (RT_TABLE_LOCAL & (FIB_TABLE_HASHSZ - 1))
272#define TABLE_MAIN_INDEX (RT_TABLE_MAIN & (FIB_TABLE_HASHSZ - 1))
273
274static inline struct fib_table *fib_get_table(struct net *net, u32 id)
275{
276 struct hlist_node *tb_hlist;
277 struct hlist_head *ptr;
278
279 ptr = id == RT_TABLE_LOCAL ?
280 &net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX] :
281 &net->ipv4.fib_table_hash[TABLE_MAIN_INDEX];
282
283 tb_hlist = rcu_dereference_rtnl(hlist_first_rcu(ptr));
284
285 return hlist_entry(tb_hlist, struct fib_table, tb_hlist);
286}
287
288static inline struct fib_table *fib_new_table(struct net *net, u32 id)
289{
290 return fib_get_table(net, id);
291}
292
293static inline int fib_lookup(struct net *net, const struct flowi4 *flp,
294 struct fib_result *res, unsigned int flags)
295{
296 struct fib_table *tb;
297 int err = -ENETUNREACH;
298
299 rcu_read_lock();
300
301 tb = fib_get_table(net, RT_TABLE_MAIN);
302 if (tb)
303 err = fib_table_lookup(tb, flp, res, flags | FIB_LOOKUP_NOREF);
304
305 if (err == -EAGAIN)
306 err = -ENETUNREACH;
307
308 rcu_read_unlock();
309
310 return err;
311}
312
313static inline bool fib4_rule_default(const struct fib_rule *rule)
314{
315 return true;
316}
317
318static inline int fib4_rules_dump(struct net *net, struct notifier_block *nb)
319{
320 return 0;
321}
322
323static inline unsigned int fib4_rules_seq_read(struct net *net)
324{
325 return 0;
326}
327
328static inline bool fib4_rules_early_flow_dissect(struct net *net,
329 struct sk_buff *skb,
330 struct flowi4 *fl4,
331 struct flow_keys *flkeys)
332{
333 return false;
334}
335#else /* CONFIG_IP_MULTIPLE_TABLES */
336int __net_init fib4_rules_init(struct net *net);
337void __net_exit fib4_rules_exit(struct net *net);
338
339struct fib_table *fib_new_table(struct net *net, u32 id);
340struct fib_table *fib_get_table(struct net *net, u32 id);
341
342int __fib_lookup(struct net *net, struct flowi4 *flp,
343 struct fib_result *res, unsigned int flags);
344
345static inline int fib_lookup(struct net *net, struct flowi4 *flp,
346 struct fib_result *res, unsigned int flags)
347{
348 struct fib_table *tb;
349 int err = -ENETUNREACH;
350
351 flags |= FIB_LOOKUP_NOREF;
352 if (net->ipv4.fib_has_custom_rules)
353 return __fib_lookup(net, flp, res, flags);
354
355 rcu_read_lock();
356
357 res->tclassid = 0;
358
359 tb = rcu_dereference_rtnl(net->ipv4.fib_main);
360 if (tb)
361 err = fib_table_lookup(tb, flp, res, flags);
362
363 if (!err)
364 goto out;
365
366 tb = rcu_dereference_rtnl(net->ipv4.fib_default);
367 if (tb)
368 err = fib_table_lookup(tb, flp, res, flags);
369
370out:
371 if (err == -EAGAIN)
372 err = -ENETUNREACH;
373
374 rcu_read_unlock();
375
376 return err;
377}
378
379bool fib4_rule_default(const struct fib_rule *rule);
380int fib4_rules_dump(struct net *net, struct notifier_block *nb);
381unsigned int fib4_rules_seq_read(struct net *net);
382
383static inline bool fib4_rules_early_flow_dissect(struct net *net,
384 struct sk_buff *skb,
385 struct flowi4 *fl4,
386 struct flow_keys *flkeys)
387{
388 unsigned int flag = FLOW_DISSECTOR_F_STOP_AT_ENCAP;
389
390 if (!net->ipv4.fib_rules_require_fldissect)
391 return false;
392
393 skb_flow_dissect_flow_keys(skb, flkeys, flag);
394 fl4->fl4_sport = flkeys->ports.src;
395 fl4->fl4_dport = flkeys->ports.dst;
396 fl4->flowi4_proto = flkeys->basic.ip_proto;
397
398 return true;
399}
400
401#endif /* CONFIG_IP_MULTIPLE_TABLES */
402
403/* Exported by fib_frontend.c */
404extern const struct nla_policy rtm_ipv4_policy[];
405void ip_fib_init(void);
406int fib_gw_from_via(struct fib_config *cfg, struct nlattr *nla,
407 struct netlink_ext_ack *extack);
408__be32 fib_compute_spec_dst(struct sk_buff *skb);
409bool fib_info_nh_uses_dev(struct fib_info *fi, const struct net_device *dev);
410int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst,
411 u8 tos, int oif, struct net_device *dev,
412 struct in_device *idev, u32 *itag);
413#ifdef CONFIG_IP_ROUTE_CLASSID
414static inline int fib_num_tclassid_users(struct net *net)
415{
416 return net->ipv4.fib_num_tclassid_users;
417}
418#else
419static inline int fib_num_tclassid_users(struct net *net)
420{
421 return 0;
422}
423#endif
424int fib_unmerge(struct net *net);
425
426/* Exported by fib_semantics.c */
427int ip_fib_check_default(__be32 gw, struct net_device *dev);
428int fib_sync_down_dev(struct net_device *dev, unsigned long event, bool force);
429int fib_sync_down_addr(struct net_device *dev, __be32 local);
430int fib_sync_up(struct net_device *dev, unsigned char nh_flags);
431void fib_sync_mtu(struct net_device *dev, u32 orig_mtu);
432void fib_nhc_update_mtu(struct fib_nh_common *nhc, u32 new, u32 orig);
433
434#ifdef CONFIG_IP_ROUTE_MULTIPATH
435int fib_multipath_hash(const struct net *net, const struct flowi4 *fl4,
436 const struct sk_buff *skb, struct flow_keys *flkeys);
437#endif
438int fib_check_nh(struct net *net, struct fib_nh *nh, u32 table, u8 scope,
439 struct netlink_ext_ack *extack);
440void fib_select_multipath(struct fib_result *res, int hash);
441void fib_select_path(struct net *net, struct fib_result *res,
442 struct flowi4 *fl4, const struct sk_buff *skb);
443
444int fib_nh_init(struct net *net, struct fib_nh *fib_nh,
445 struct fib_config *cfg, int nh_weight,
446 struct netlink_ext_ack *extack);
447void fib_nh_release(struct net *net, struct fib_nh *fib_nh);
448int fib_nh_common_init(struct fib_nh_common *nhc, struct nlattr *fc_encap,
449 u16 fc_encap_type, void *cfg, gfp_t gfp_flags,
450 struct netlink_ext_ack *extack);
451void fib_nh_common_release(struct fib_nh_common *nhc);
452
453/* Exported by fib_trie.c */
454void fib_trie_init(void);
455struct fib_table *fib_trie_table(u32 id, struct fib_table *alias);
456
457static inline void fib_combine_itag(u32 *itag, const struct fib_result *res)
458{
459#ifdef CONFIG_IP_ROUTE_CLASSID
460 struct fib_nh_common *nhc = res->nhc;
461#ifdef CONFIG_IP_MULTIPLE_TABLES
462 u32 rtag;
463#endif
464 if (nhc->nhc_family == AF_INET) {
465 struct fib_nh *nh;
466
467 nh = container_of(nhc, struct fib_nh, nh_common);
468 *itag = nh->nh_tclassid << 16;
469 } else {
470 *itag = 0;
471 }
472
473#ifdef CONFIG_IP_MULTIPLE_TABLES
474 rtag = res->tclassid;
475 if (*itag == 0)
476 *itag = (rtag<<16);
477 *itag |= (rtag>>16);
478#endif
479#endif
480}
481
482void fib_flush(struct net *net);
483void free_fib_info(struct fib_info *fi);
484
485static inline void fib_info_hold(struct fib_info *fi)
486{
487 refcount_inc(&fi->fib_clntref);
488}
489
490static inline void fib_info_put(struct fib_info *fi)
491{
492 if (refcount_dec_and_test(&fi->fib_clntref))
493 free_fib_info(fi);
494}
495
496#ifdef CONFIG_PROC_FS
497int __net_init fib_proc_init(struct net *net);
498void __net_exit fib_proc_exit(struct net *net);
499#else
500static inline int fib_proc_init(struct net *net)
501{
502 return 0;
503}
504static inline void fib_proc_exit(struct net *net)
505{
506}
507#endif
508
509u32 ip_mtu_from_fib_result(struct fib_result *res, __be32 daddr);
510
511int ip_valid_fib_dump_req(struct net *net, const struct nlmsghdr *nlh,
512 struct fib_dump_filter *filter,
513 struct netlink_callback *cb);
514
515int fib_nexthop_info(struct sk_buff *skb, const struct fib_nh_common *nh,
516 u8 rt_family, unsigned char *flags, bool skip_oif);
517int fib_add_nexthop(struct sk_buff *skb, const struct fib_nh_common *nh,
518 int nh_weight, u8 rt_family);
519#endif /* _NET_FIB_H */
1/*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * Definitions for the Forwarding Information Base.
7 *
8 * Authors: A.N.Kuznetsov, <kuznet@ms2.inr.ac.ru>
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
14 */
15
16#ifndef _NET_IP_FIB_H
17#define _NET_IP_FIB_H
18
19#include <net/flow.h>
20#include <linux/seq_file.h>
21#include <linux/rcupdate.h>
22#include <net/fib_rules.h>
23#include <net/inetpeer.h>
24#include <linux/percpu.h>
25#include <linux/notifier.h>
26
27struct fib_config {
28 u8 fc_dst_len;
29 u8 fc_tos;
30 u8 fc_protocol;
31 u8 fc_scope;
32 u8 fc_type;
33 /* 3 bytes unused */
34 u32 fc_table;
35 __be32 fc_dst;
36 __be32 fc_gw;
37 int fc_oif;
38 u32 fc_flags;
39 u32 fc_priority;
40 __be32 fc_prefsrc;
41 struct nlattr *fc_mx;
42 struct rtnexthop *fc_mp;
43 int fc_mx_len;
44 int fc_mp_len;
45 u32 fc_flow;
46 u32 fc_nlflags;
47 struct nl_info fc_nlinfo;
48 struct nlattr *fc_encap;
49 u16 fc_encap_type;
50};
51
52struct fib_info;
53struct rtable;
54
55struct fib_nh_exception {
56 struct fib_nh_exception __rcu *fnhe_next;
57 int fnhe_genid;
58 __be32 fnhe_daddr;
59 u32 fnhe_pmtu;
60 __be32 fnhe_gw;
61 unsigned long fnhe_expires;
62 struct rtable __rcu *fnhe_rth_input;
63 struct rtable __rcu *fnhe_rth_output;
64 unsigned long fnhe_stamp;
65 struct rcu_head rcu;
66};
67
68struct fnhe_hash_bucket {
69 struct fib_nh_exception __rcu *chain;
70};
71
72#define FNHE_HASH_SHIFT 11
73#define FNHE_HASH_SIZE (1 << FNHE_HASH_SHIFT)
74#define FNHE_RECLAIM_DEPTH 5
75
76struct fib_nh {
77 struct net_device *nh_dev;
78 struct hlist_node nh_hash;
79 struct fib_info *nh_parent;
80 unsigned int nh_flags;
81 unsigned char nh_scope;
82#ifdef CONFIG_IP_ROUTE_MULTIPATH
83 int nh_weight;
84 atomic_t nh_upper_bound;
85#endif
86#ifdef CONFIG_IP_ROUTE_CLASSID
87 __u32 nh_tclassid;
88#endif
89 int nh_oif;
90 __be32 nh_gw;
91 __be32 nh_saddr;
92 int nh_saddr_genid;
93 struct rtable __rcu * __percpu *nh_pcpu_rth_output;
94 struct rtable __rcu *nh_rth_input;
95 struct fnhe_hash_bucket __rcu *nh_exceptions;
96 struct lwtunnel_state *nh_lwtstate;
97};
98
99/*
100 * This structure contains data shared by many of routes.
101 */
102
103struct fib_info {
104 struct hlist_node fib_hash;
105 struct hlist_node fib_lhash;
106 struct net *fib_net;
107 int fib_treeref;
108 atomic_t fib_clntref;
109 unsigned int fib_flags;
110 unsigned char fib_dead;
111 unsigned char fib_protocol;
112 unsigned char fib_scope;
113 unsigned char fib_type;
114 __be32 fib_prefsrc;
115 u32 fib_tb_id;
116 u32 fib_priority;
117 u32 *fib_metrics;
118#define fib_mtu fib_metrics[RTAX_MTU-1]
119#define fib_window fib_metrics[RTAX_WINDOW-1]
120#define fib_rtt fib_metrics[RTAX_RTT-1]
121#define fib_advmss fib_metrics[RTAX_ADVMSS-1]
122 int fib_nhs;
123#ifdef CONFIG_IP_ROUTE_MULTIPATH
124 int fib_weight;
125#endif
126 unsigned int fib_offload_cnt;
127 struct rcu_head rcu;
128 struct fib_nh fib_nh[0];
129#define fib_dev fib_nh[0].nh_dev
130};
131
132
133#ifdef CONFIG_IP_MULTIPLE_TABLES
134struct fib_rule;
135#endif
136
137struct fib_table;
138struct fib_result {
139 unsigned char prefixlen;
140 unsigned char nh_sel;
141 unsigned char type;
142 unsigned char scope;
143 u32 tclassid;
144 struct fib_info *fi;
145 struct fib_table *table;
146 struct hlist_head *fa_head;
147};
148
149struct fib_result_nl {
150 __be32 fl_addr; /* To be looked up*/
151 u32 fl_mark;
152 unsigned char fl_tos;
153 unsigned char fl_scope;
154 unsigned char tb_id_in;
155
156 unsigned char tb_id; /* Results */
157 unsigned char prefixlen;
158 unsigned char nh_sel;
159 unsigned char type;
160 unsigned char scope;
161 int err;
162};
163
164#ifdef CONFIG_IP_ROUTE_MULTIPATH
165#define FIB_RES_NH(res) ((res).fi->fib_nh[(res).nh_sel])
166#else /* CONFIG_IP_ROUTE_MULTIPATH */
167#define FIB_RES_NH(res) ((res).fi->fib_nh[0])
168#endif /* CONFIG_IP_ROUTE_MULTIPATH */
169
170#ifdef CONFIG_IP_MULTIPLE_TABLES
171#define FIB_TABLE_HASHSZ 256
172#else
173#define FIB_TABLE_HASHSZ 2
174#endif
175
176__be32 fib_info_update_nh_saddr(struct net *net, struct fib_nh *nh);
177
178static inline void fib_info_offload_inc(struct fib_info *fi)
179{
180 fi->fib_offload_cnt++;
181 fi->fib_flags |= RTNH_F_OFFLOAD;
182}
183
184static inline void fib_info_offload_dec(struct fib_info *fi)
185{
186 if (--fi->fib_offload_cnt == 0)
187 fi->fib_flags &= ~RTNH_F_OFFLOAD;
188}
189
190#define FIB_RES_SADDR(net, res) \
191 ((FIB_RES_NH(res).nh_saddr_genid == \
192 atomic_read(&(net)->ipv4.dev_addr_genid)) ? \
193 FIB_RES_NH(res).nh_saddr : \
194 fib_info_update_nh_saddr((net), &FIB_RES_NH(res)))
195#define FIB_RES_GW(res) (FIB_RES_NH(res).nh_gw)
196#define FIB_RES_DEV(res) (FIB_RES_NH(res).nh_dev)
197#define FIB_RES_OIF(res) (FIB_RES_NH(res).nh_oif)
198
199#define FIB_RES_PREFSRC(net, res) ((res).fi->fib_prefsrc ? : \
200 FIB_RES_SADDR(net, res))
201
202struct fib_notifier_info {
203 struct net *net;
204};
205
206struct fib_entry_notifier_info {
207 struct fib_notifier_info info; /* must be first */
208 u32 dst;
209 int dst_len;
210 struct fib_info *fi;
211 u8 tos;
212 u8 type;
213 u32 tb_id;
214 u32 nlflags;
215};
216
217enum fib_event_type {
218 FIB_EVENT_ENTRY_ADD,
219 FIB_EVENT_ENTRY_DEL,
220 FIB_EVENT_RULE_ADD,
221 FIB_EVENT_RULE_DEL,
222};
223
224int register_fib_notifier(struct notifier_block *nb,
225 void (*cb)(struct notifier_block *nb));
226int unregister_fib_notifier(struct notifier_block *nb);
227int call_fib_notifiers(struct net *net, enum fib_event_type event_type,
228 struct fib_notifier_info *info);
229
230struct fib_table {
231 struct hlist_node tb_hlist;
232 u32 tb_id;
233 int tb_num_default;
234 struct rcu_head rcu;
235 unsigned long *tb_data;
236 unsigned long __data[0];
237};
238
239int fib_table_lookup(struct fib_table *tb, const struct flowi4 *flp,
240 struct fib_result *res, int fib_flags);
241int fib_table_insert(struct net *, struct fib_table *, struct fib_config *);
242int fib_table_delete(struct net *, struct fib_table *, struct fib_config *);
243int fib_table_dump(struct fib_table *table, struct sk_buff *skb,
244 struct netlink_callback *cb);
245int fib_table_flush(struct net *net, struct fib_table *table);
246struct fib_table *fib_trie_unmerge(struct fib_table *main_tb);
247void fib_table_flush_external(struct fib_table *table);
248void fib_free_table(struct fib_table *tb);
249
250#ifndef CONFIG_IP_MULTIPLE_TABLES
251
252#define TABLE_LOCAL_INDEX (RT_TABLE_LOCAL & (FIB_TABLE_HASHSZ - 1))
253#define TABLE_MAIN_INDEX (RT_TABLE_MAIN & (FIB_TABLE_HASHSZ - 1))
254
255static inline struct fib_table *fib_get_table(struct net *net, u32 id)
256{
257 struct hlist_node *tb_hlist;
258 struct hlist_head *ptr;
259
260 ptr = id == RT_TABLE_LOCAL ?
261 &net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX] :
262 &net->ipv4.fib_table_hash[TABLE_MAIN_INDEX];
263
264 tb_hlist = rcu_dereference_rtnl(hlist_first_rcu(ptr));
265
266 return hlist_entry(tb_hlist, struct fib_table, tb_hlist);
267}
268
269static inline struct fib_table *fib_new_table(struct net *net, u32 id)
270{
271 return fib_get_table(net, id);
272}
273
274static inline int fib_lookup(struct net *net, const struct flowi4 *flp,
275 struct fib_result *res, unsigned int flags)
276{
277 struct fib_table *tb;
278 int err = -ENETUNREACH;
279
280 rcu_read_lock();
281
282 tb = fib_get_table(net, RT_TABLE_MAIN);
283 if (tb)
284 err = fib_table_lookup(tb, flp, res, flags | FIB_LOOKUP_NOREF);
285
286 if (err == -EAGAIN)
287 err = -ENETUNREACH;
288
289 rcu_read_unlock();
290
291 return err;
292}
293
294#else /* CONFIG_IP_MULTIPLE_TABLES */
295int __net_init fib4_rules_init(struct net *net);
296void __net_exit fib4_rules_exit(struct net *net);
297
298struct fib_table *fib_new_table(struct net *net, u32 id);
299struct fib_table *fib_get_table(struct net *net, u32 id);
300
301int __fib_lookup(struct net *net, struct flowi4 *flp,
302 struct fib_result *res, unsigned int flags);
303
304static inline int fib_lookup(struct net *net, struct flowi4 *flp,
305 struct fib_result *res, unsigned int flags)
306{
307 struct fib_table *tb;
308 int err = -ENETUNREACH;
309
310 flags |= FIB_LOOKUP_NOREF;
311 if (net->ipv4.fib_has_custom_rules)
312 return __fib_lookup(net, flp, res, flags);
313
314 rcu_read_lock();
315
316 res->tclassid = 0;
317
318 tb = rcu_dereference_rtnl(net->ipv4.fib_main);
319 if (tb)
320 err = fib_table_lookup(tb, flp, res, flags);
321
322 if (!err)
323 goto out;
324
325 tb = rcu_dereference_rtnl(net->ipv4.fib_default);
326 if (tb)
327 err = fib_table_lookup(tb, flp, res, flags);
328
329out:
330 if (err == -EAGAIN)
331 err = -ENETUNREACH;
332
333 rcu_read_unlock();
334
335 return err;
336}
337
338#endif /* CONFIG_IP_MULTIPLE_TABLES */
339
340/* Exported by fib_frontend.c */
341extern const struct nla_policy rtm_ipv4_policy[];
342void ip_fib_init(void);
343__be32 fib_compute_spec_dst(struct sk_buff *skb);
344int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst,
345 u8 tos, int oif, struct net_device *dev,
346 struct in_device *idev, u32 *itag);
347void fib_select_default(const struct flowi4 *flp, struct fib_result *res);
348#ifdef CONFIG_IP_ROUTE_CLASSID
349static inline int fib_num_tclassid_users(struct net *net)
350{
351 return net->ipv4.fib_num_tclassid_users;
352}
353#else
354static inline int fib_num_tclassid_users(struct net *net)
355{
356 return 0;
357}
358#endif
359int fib_unmerge(struct net *net);
360
361/* Exported by fib_semantics.c */
362int ip_fib_check_default(__be32 gw, struct net_device *dev);
363int fib_sync_down_dev(struct net_device *dev, unsigned long event, bool force);
364int fib_sync_down_addr(struct net_device *dev, __be32 local);
365int fib_sync_up(struct net_device *dev, unsigned int nh_flags);
366
367extern u32 fib_multipath_secret __read_mostly;
368
369static inline int fib_multipath_hash(__be32 saddr, __be32 daddr)
370{
371 return jhash_2words((__force u32)saddr, (__force u32)daddr,
372 fib_multipath_secret) >> 1;
373}
374
375void fib_select_multipath(struct fib_result *res, int hash);
376void fib_select_path(struct net *net, struct fib_result *res,
377 struct flowi4 *fl4, int mp_hash);
378
379/* Exported by fib_trie.c */
380void fib_trie_init(void);
381struct fib_table *fib_trie_table(u32 id, struct fib_table *alias);
382
383static inline void fib_combine_itag(u32 *itag, const struct fib_result *res)
384{
385#ifdef CONFIG_IP_ROUTE_CLASSID
386#ifdef CONFIG_IP_MULTIPLE_TABLES
387 u32 rtag;
388#endif
389 *itag = FIB_RES_NH(*res).nh_tclassid<<16;
390#ifdef CONFIG_IP_MULTIPLE_TABLES
391 rtag = res->tclassid;
392 if (*itag == 0)
393 *itag = (rtag<<16);
394 *itag |= (rtag>>16);
395#endif
396#endif
397}
398
399void free_fib_info(struct fib_info *fi);
400
401static inline void fib_info_hold(struct fib_info *fi)
402{
403 atomic_inc(&fi->fib_clntref);
404}
405
406static inline void fib_info_put(struct fib_info *fi)
407{
408 if (atomic_dec_and_test(&fi->fib_clntref))
409 free_fib_info(fi);
410}
411
412#ifdef CONFIG_PROC_FS
413int __net_init fib_proc_init(struct net *net);
414void __net_exit fib_proc_exit(struct net *net);
415#else
416static inline int fib_proc_init(struct net *net)
417{
418 return 0;
419}
420static inline void fib_proc_exit(struct net *net)
421{
422}
423#endif
424
425#endif /* _NET_FIB_H */