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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
26struct fib_config {
27 u8 fc_dst_len;
28 u8 fc_tos;
29 u8 fc_protocol;
30 u8 fc_scope;
31 u8 fc_type;
32 /* 3 bytes unused */
33 u32 fc_table;
34 __be32 fc_dst;
35 __be32 fc_gw;
36 int fc_oif;
37 u32 fc_flags;
38 u32 fc_priority;
39 __be32 fc_prefsrc;
40 struct nlattr *fc_mx;
41 struct rtnexthop *fc_mp;
42 int fc_mx_len;
43 int fc_mp_len;
44 u32 fc_flow;
45 u32 fc_nlflags;
46 struct nl_info fc_nlinfo;
47 struct nlattr *fc_encap;
48 u16 fc_encap_type;
49};
50
51struct fib_info;
52struct rtable;
53
54struct fib_nh_exception {
55 struct fib_nh_exception __rcu *fnhe_next;
56 int fnhe_genid;
57 __be32 fnhe_daddr;
58 u32 fnhe_pmtu;
59 __be32 fnhe_gw;
60 unsigned long fnhe_expires;
61 struct rtable __rcu *fnhe_rth_input;
62 struct rtable __rcu *fnhe_rth_output;
63 unsigned long fnhe_stamp;
64 struct rcu_head rcu;
65};
66
67struct fnhe_hash_bucket {
68 struct fib_nh_exception __rcu *chain;
69};
70
71#define FNHE_HASH_SHIFT 11
72#define FNHE_HASH_SIZE (1 << FNHE_HASH_SHIFT)
73#define FNHE_RECLAIM_DEPTH 5
74
75struct fib_nh {
76 struct net_device *nh_dev;
77 struct hlist_node nh_hash;
78 struct fib_info *nh_parent;
79 unsigned int nh_flags;
80 unsigned char nh_scope;
81#ifdef CONFIG_IP_ROUTE_MULTIPATH
82 int nh_weight;
83 atomic_t nh_upper_bound;
84#endif
85#ifdef CONFIG_IP_ROUTE_CLASSID
86 __u32 nh_tclassid;
87#endif
88 int nh_oif;
89 __be32 nh_gw;
90 __be32 nh_saddr;
91 int nh_saddr_genid;
92 struct rtable __rcu * __percpu *nh_pcpu_rth_output;
93 struct rtable __rcu *nh_rth_input;
94 struct fnhe_hash_bucket __rcu *nh_exceptions;
95 struct lwtunnel_state *nh_lwtstate;
96};
97
98/*
99 * This structure contains data shared by many of routes.
100 */
101
102struct fib_info {
103 struct hlist_node fib_hash;
104 struct hlist_node fib_lhash;
105 struct net *fib_net;
106 int fib_treeref;
107 atomic_t fib_clntref;
108 unsigned int fib_flags;
109 unsigned char fib_dead;
110 unsigned char fib_protocol;
111 unsigned char fib_scope;
112 unsigned char fib_type;
113 __be32 fib_prefsrc;
114 u32 fib_priority;
115 u32 *fib_metrics;
116#define fib_mtu fib_metrics[RTAX_MTU-1]
117#define fib_window fib_metrics[RTAX_WINDOW-1]
118#define fib_rtt fib_metrics[RTAX_RTT-1]
119#define fib_advmss fib_metrics[RTAX_ADVMSS-1]
120 int fib_nhs;
121#ifdef CONFIG_IP_ROUTE_MULTIPATH
122 int fib_weight;
123#endif
124 struct rcu_head rcu;
125 struct fib_nh fib_nh[0];
126#define fib_dev fib_nh[0].nh_dev
127};
128
129
130#ifdef CONFIG_IP_MULTIPLE_TABLES
131struct fib_rule;
132#endif
133
134struct fib_table;
135struct fib_result {
136 unsigned char prefixlen;
137 unsigned char nh_sel;
138 unsigned char type;
139 unsigned char scope;
140 u32 tclassid;
141 struct fib_info *fi;
142 struct fib_table *table;
143 struct hlist_head *fa_head;
144};
145
146struct fib_result_nl {
147 __be32 fl_addr; /* To be looked up*/
148 u32 fl_mark;
149 unsigned char fl_tos;
150 unsigned char fl_scope;
151 unsigned char tb_id_in;
152
153 unsigned char tb_id; /* Results */
154 unsigned char prefixlen;
155 unsigned char nh_sel;
156 unsigned char type;
157 unsigned char scope;
158 int err;
159};
160
161#ifdef CONFIG_IP_ROUTE_MULTIPATH
162#define FIB_RES_NH(res) ((res).fi->fib_nh[(res).nh_sel])
163#else /* CONFIG_IP_ROUTE_MULTIPATH */
164#define FIB_RES_NH(res) ((res).fi->fib_nh[0])
165#endif /* CONFIG_IP_ROUTE_MULTIPATH */
166
167#ifdef CONFIG_IP_MULTIPLE_TABLES
168#define FIB_TABLE_HASHSZ 256
169#else
170#define FIB_TABLE_HASHSZ 2
171#endif
172
173__be32 fib_info_update_nh_saddr(struct net *net, struct fib_nh *nh);
174
175#define FIB_RES_SADDR(net, res) \
176 ((FIB_RES_NH(res).nh_saddr_genid == \
177 atomic_read(&(net)->ipv4.dev_addr_genid)) ? \
178 FIB_RES_NH(res).nh_saddr : \
179 fib_info_update_nh_saddr((net), &FIB_RES_NH(res)))
180#define FIB_RES_GW(res) (FIB_RES_NH(res).nh_gw)
181#define FIB_RES_DEV(res) (FIB_RES_NH(res).nh_dev)
182#define FIB_RES_OIF(res) (FIB_RES_NH(res).nh_oif)
183
184#define FIB_RES_PREFSRC(net, res) ((res).fi->fib_prefsrc ? : \
185 FIB_RES_SADDR(net, res))
186
187struct fib_table {
188 struct hlist_node tb_hlist;
189 u32 tb_id;
190 int tb_num_default;
191 struct rcu_head rcu;
192 unsigned long *tb_data;
193 unsigned long __data[0];
194};
195
196int fib_table_lookup(struct fib_table *tb, const struct flowi4 *flp,
197 struct fib_result *res, int fib_flags);
198int fib_table_insert(struct fib_table *, struct fib_config *);
199int fib_table_delete(struct fib_table *, struct fib_config *);
200int fib_table_dump(struct fib_table *table, struct sk_buff *skb,
201 struct netlink_callback *cb);
202int fib_table_flush(struct fib_table *table);
203struct fib_table *fib_trie_unmerge(struct fib_table *main_tb);
204void fib_table_flush_external(struct fib_table *table);
205void fib_free_table(struct fib_table *tb);
206
207#ifndef CONFIG_IP_MULTIPLE_TABLES
208
209#define TABLE_LOCAL_INDEX (RT_TABLE_LOCAL & (FIB_TABLE_HASHSZ - 1))
210#define TABLE_MAIN_INDEX (RT_TABLE_MAIN & (FIB_TABLE_HASHSZ - 1))
211
212static inline struct fib_table *fib_get_table(struct net *net, u32 id)
213{
214 struct hlist_node *tb_hlist;
215 struct hlist_head *ptr;
216
217 ptr = id == RT_TABLE_LOCAL ?
218 &net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX] :
219 &net->ipv4.fib_table_hash[TABLE_MAIN_INDEX];
220
221 tb_hlist = rcu_dereference_rtnl(hlist_first_rcu(ptr));
222
223 return hlist_entry(tb_hlist, struct fib_table, tb_hlist);
224}
225
226static inline struct fib_table *fib_new_table(struct net *net, u32 id)
227{
228 return fib_get_table(net, id);
229}
230
231static inline int fib_lookup(struct net *net, const struct flowi4 *flp,
232 struct fib_result *res, unsigned int flags)
233{
234 struct fib_table *tb;
235 int err = -ENETUNREACH;
236
237 rcu_read_lock();
238
239 tb = fib_get_table(net, RT_TABLE_MAIN);
240 if (tb)
241 err = fib_table_lookup(tb, flp, res, flags | FIB_LOOKUP_NOREF);
242
243 if (err == -EAGAIN)
244 err = -ENETUNREACH;
245
246 rcu_read_unlock();
247
248 return err;
249}
250
251#else /* CONFIG_IP_MULTIPLE_TABLES */
252int __net_init fib4_rules_init(struct net *net);
253void __net_exit fib4_rules_exit(struct net *net);
254
255struct fib_table *fib_new_table(struct net *net, u32 id);
256struct fib_table *fib_get_table(struct net *net, u32 id);
257
258int __fib_lookup(struct net *net, struct flowi4 *flp,
259 struct fib_result *res, unsigned int flags);
260
261static inline int fib_lookup(struct net *net, struct flowi4 *flp,
262 struct fib_result *res, unsigned int flags)
263{
264 struct fib_table *tb;
265 int err = -ENETUNREACH;
266
267 flags |= FIB_LOOKUP_NOREF;
268 if (net->ipv4.fib_has_custom_rules)
269 return __fib_lookup(net, flp, res, flags);
270
271 rcu_read_lock();
272
273 res->tclassid = 0;
274
275 tb = rcu_dereference_rtnl(net->ipv4.fib_main);
276 if (tb)
277 err = fib_table_lookup(tb, flp, res, flags);
278
279 if (!err)
280 goto out;
281
282 tb = rcu_dereference_rtnl(net->ipv4.fib_default);
283 if (tb)
284 err = fib_table_lookup(tb, flp, res, flags);
285
286out:
287 if (err == -EAGAIN)
288 err = -ENETUNREACH;
289
290 rcu_read_unlock();
291
292 return err;
293}
294
295#endif /* CONFIG_IP_MULTIPLE_TABLES */
296
297/* Exported by fib_frontend.c */
298extern const struct nla_policy rtm_ipv4_policy[];
299void ip_fib_init(void);
300__be32 fib_compute_spec_dst(struct sk_buff *skb);
301int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst,
302 u8 tos, int oif, struct net_device *dev,
303 struct in_device *idev, u32 *itag);
304void fib_select_default(const struct flowi4 *flp, struct fib_result *res);
305#ifdef CONFIG_IP_ROUTE_CLASSID
306static inline int fib_num_tclassid_users(struct net *net)
307{
308 return net->ipv4.fib_num_tclassid_users;
309}
310#else
311static inline int fib_num_tclassid_users(struct net *net)
312{
313 return 0;
314}
315#endif
316int fib_unmerge(struct net *net);
317void fib_flush_external(struct net *net);
318
319/* Exported by fib_semantics.c */
320int ip_fib_check_default(__be32 gw, struct net_device *dev);
321int fib_sync_down_dev(struct net_device *dev, unsigned long event, bool force);
322int fib_sync_down_addr(struct net *net, __be32 local);
323int fib_sync_up(struct net_device *dev, unsigned int nh_flags);
324
325extern u32 fib_multipath_secret __read_mostly;
326
327static inline int fib_multipath_hash(__be32 saddr, __be32 daddr)
328{
329 return jhash_2words((__force u32)saddr, (__force u32)daddr,
330 fib_multipath_secret) >> 1;
331}
332
333void fib_select_multipath(struct fib_result *res, int hash);
334void fib_select_path(struct net *net, struct fib_result *res,
335 struct flowi4 *fl4, int mp_hash);
336
337/* Exported by fib_trie.c */
338void fib_trie_init(void);
339struct fib_table *fib_trie_table(u32 id, struct fib_table *alias);
340
341static inline void fib_combine_itag(u32 *itag, const struct fib_result *res)
342{
343#ifdef CONFIG_IP_ROUTE_CLASSID
344#ifdef CONFIG_IP_MULTIPLE_TABLES
345 u32 rtag;
346#endif
347 *itag = FIB_RES_NH(*res).nh_tclassid<<16;
348#ifdef CONFIG_IP_MULTIPLE_TABLES
349 rtag = res->tclassid;
350 if (*itag == 0)
351 *itag = (rtag<<16);
352 *itag |= (rtag>>16);
353#endif
354#endif
355}
356
357void free_fib_info(struct fib_info *fi);
358
359static inline void fib_info_put(struct fib_info *fi)
360{
361 if (atomic_dec_and_test(&fi->fib_clntref))
362 free_fib_info(fi);
363}
364
365#ifdef CONFIG_PROC_FS
366int __net_init fib_proc_init(struct net *net);
367void __net_exit fib_proc_exit(struct net *net);
368#else
369static inline int fib_proc_init(struct net *net)
370{
371 return 0;
372}
373static inline void fib_proc_exit(struct net *net)
374{
375}
376#endif
377
378#endif /* _NET_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, <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 */