Commit | Line | Data |
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1da177e4 LT |
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 | ||
1da177e4 LT |
19 | #include <net/flow.h> |
20 | #include <linux/seq_file.h> | |
4895c771 | 21 | #include <linux/rcupdate.h> |
e1ef4bf2 | 22 | #include <net/fib_rules.h> |
8e773277 | 23 | #include <net/inetpeer.h> |
d26b3a7c | 24 | #include <linux/percpu.h> |
1da177e4 | 25 | |
4e902c57 | 26 | struct fib_config { |
4e902c57 | 27 | u8 fc_dst_len; |
4e902c57 TG |
28 | u8 fc_tos; |
29 | u8 fc_protocol; | |
30 | u8 fc_scope; | |
31 | u8 fc_type; | |
b52f070c | 32 | /* 3 bytes unused */ |
4e902c57 | 33 | u32 fc_table; |
6d85c10a | 34 | __be32 fc_dst; |
6d85c10a | 35 | __be32 fc_gw; |
4e902c57 TG |
36 | int fc_oif; |
37 | u32 fc_flags; | |
38 | u32 fc_priority; | |
6d85c10a | 39 | __be32 fc_prefsrc; |
4e902c57 TG |
40 | struct nlattr *fc_mx; |
41 | struct rtnexthop *fc_mp; | |
42 | int fc_mx_len; | |
43 | int fc_mp_len; | |
44 | u32 fc_flow; | |
4e902c57 TG |
45 | u32 fc_nlflags; |
46 | struct nl_info fc_nlinfo; | |
571e7226 RP |
47 | struct nlattr *fc_encap; |
48 | u16 fc_encap_type; | |
49 | }; | |
1da177e4 LT |
50 | |
51 | struct fib_info; | |
f2bb4bed | 52 | struct rtable; |
1da177e4 | 53 | |
4895c771 DM |
54 | struct fib_nh_exception { |
55 | struct fib_nh_exception __rcu *fnhe_next; | |
5aad1de5 | 56 | int fnhe_genid; |
4895c771 DM |
57 | __be32 fnhe_daddr; |
58 | u32 fnhe_pmtu; | |
aee06da6 | 59 | __be32 fnhe_gw; |
4895c771 | 60 | unsigned long fnhe_expires; |
2ffae99d TT |
61 | struct rtable __rcu *fnhe_rth_input; |
62 | struct rtable __rcu *fnhe_rth_output; | |
4895c771 | 63 | unsigned long fnhe_stamp; |
deed49df | 64 | struct rcu_head rcu; |
4895c771 DM |
65 | }; |
66 | ||
67 | struct fnhe_hash_bucket { | |
68 | struct fib_nh_exception __rcu *chain; | |
69 | }; | |
70 | ||
d546c621 ED |
71 | #define FNHE_HASH_SHIFT 11 |
72 | #define FNHE_HASH_SIZE (1 << FNHE_HASH_SHIFT) | |
4895c771 DM |
73 | #define FNHE_RECLAIM_DEPTH 5 |
74 | ||
1da177e4 LT |
75 | struct fib_nh { |
76 | struct net_device *nh_dev; | |
77 | struct hlist_node nh_hash; | |
78 | struct fib_info *nh_parent; | |
95c96174 | 79 | unsigned int nh_flags; |
1da177e4 LT |
80 | unsigned char nh_scope; |
81 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
82 | int nh_weight; | |
0e884c78 | 83 | atomic_t nh_upper_bound; |
1da177e4 | 84 | #endif |
c7066f70 | 85 | #ifdef CONFIG_IP_ROUTE_CLASSID |
1da177e4 LT |
86 | __u32 nh_tclassid; |
87 | #endif | |
88 | int nh_oif; | |
ed49e3ca | 89 | __be32 nh_gw; |
1fc050a1 | 90 | __be32 nh_saddr; |
436c3b66 | 91 | int nh_saddr_genid; |
d26b3a7c | 92 | struct rtable __rcu * __percpu *nh_pcpu_rth_output; |
54764bb6 | 93 | struct rtable __rcu *nh_rth_input; |
caa41527 | 94 | struct fnhe_hash_bucket __rcu *nh_exceptions; |
571e7226 | 95 | struct lwtunnel_state *nh_lwtstate; |
1da177e4 LT |
96 | }; |
97 | ||
98 | /* | |
99 | * This structure contains data shared by many of routes. | |
100 | */ | |
101 | ||
102 | struct fib_info { | |
103 | struct hlist_node fib_hash; | |
104 | struct hlist_node fib_lhash; | |
7462bd74 | 105 | struct net *fib_net; |
1da177e4 LT |
106 | int fib_treeref; |
107 | atomic_t fib_clntref; | |
95c96174 | 108 | unsigned int fib_flags; |
37e826c5 DM |
109 | unsigned char fib_dead; |
110 | unsigned char fib_protocol; | |
111 | unsigned char fib_scope; | |
f4ef85bb | 112 | unsigned char fib_type; |
b83738ae | 113 | __be32 fib_prefsrc; |
1da177e4 | 114 | u32 fib_priority; |
9c150e82 | 115 | u32 *fib_metrics; |
1da177e4 LT |
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 | |
0e884c78 | 122 | int fib_weight; |
1da177e4 | 123 | #endif |
ebc0ffae | 124 | struct rcu_head rcu; |
1da177e4 LT |
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 | |
131 | struct fib_rule; | |
132 | #endif | |
133 | ||
5b470441 | 134 | struct fib_table; |
1da177e4 LT |
135 | struct fib_result { |
136 | unsigned char prefixlen; | |
137 | unsigned char nh_sel; | |
138 | unsigned char type; | |
139 | unsigned char scope; | |
85b91b03 | 140 | u32 tclassid; |
1da177e4 | 141 | struct fib_info *fi; |
5b470441 | 142 | struct fib_table *table; |
56315f9e | 143 | struct hlist_head *fa_head; |
1da177e4 LT |
144 | }; |
145 | ||
246955fe | 146 | struct fib_result_nl { |
80e856e1 | 147 | __be32 fl_addr; /* To be looked up*/ |
5f300893 | 148 | u32 fl_mark; |
246955fe RO |
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 | }; | |
1da177e4 LT |
160 | |
161 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
1da177e4 | 162 | #define FIB_RES_NH(res) ((res).fi->fib_nh[(res).nh_sel]) |
1da177e4 | 163 | #else /* CONFIG_IP_ROUTE_MULTIPATH */ |
1da177e4 | 164 | #define FIB_RES_NH(res) ((res).fi->fib_nh[0]) |
5b9e12db | 165 | #endif /* CONFIG_IP_ROUTE_MULTIPATH */ |
1da177e4 | 166 | |
5b9e12db | 167 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
93456b6d | 168 | #define FIB_TABLE_HASHSZ 256 |
5b9e12db DL |
169 | #else |
170 | #define FIB_TABLE_HASHSZ 2 | |
171 | #endif | |
1da177e4 | 172 | |
5c3a0fd7 | 173 | __be32 fib_info_update_nh_saddr(struct net *net, struct fib_nh *nh); |
436c3b66 DM |
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))) | |
1da177e4 LT |
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 | ||
436c3b66 DM |
184 | #define FIB_RES_PREFSRC(net, res) ((res).fi->fib_prefsrc ? : \ |
185 | FIB_RES_SADDR(net, res)) | |
1fc050a1 | 186 | |
1da177e4 | 187 | struct fib_table { |
8e773277 DM |
188 | struct hlist_node tb_hlist; |
189 | u32 tb_id; | |
8e773277 | 190 | int tb_num_default; |
a7e53531 | 191 | struct rcu_head rcu; |
0ddcf43d AD |
192 | unsigned long *tb_data; |
193 | unsigned long __data[0]; | |
1da177e4 LT |
194 | }; |
195 | ||
5c3a0fd7 JP |
196 | int fib_table_lookup(struct fib_table *tb, const struct flowi4 *flp, |
197 | struct fib_result *res, int fib_flags); | |
198 | int fib_table_insert(struct fib_table *, struct fib_config *); | |
199 | int fib_table_delete(struct fib_table *, struct fib_config *); | |
200 | int fib_table_dump(struct fib_table *table, struct sk_buff *skb, | |
201 | struct netlink_callback *cb); | |
202 | int fib_table_flush(struct fib_table *table); | |
0ddcf43d | 203 | struct fib_table *fib_trie_unmerge(struct fib_table *main_tb); |
104616e7 | 204 | void fib_table_flush_external(struct fib_table *table); |
5c3a0fd7 | 205 | void fib_free_table(struct fib_table *tb); |
4aa2c466 | 206 | |
1da177e4 LT |
207 | #ifndef CONFIG_IP_MULTIPLE_TABLES |
208 | ||
a5a519b2 AD |
209 | #define TABLE_LOCAL_INDEX (RT_TABLE_LOCAL & (FIB_TABLE_HASHSZ - 1)) |
210 | #define TABLE_MAIN_INDEX (RT_TABLE_MAIN & (FIB_TABLE_HASHSZ - 1)) | |
1da177e4 | 211 | |
8ad4942c | 212 | static inline struct fib_table *fib_get_table(struct net *net, u32 id) |
1da177e4 | 213 | { |
a7e53531 | 214 | struct hlist_node *tb_hlist; |
93456b6d DL |
215 | struct hlist_head *ptr; |
216 | ||
217 | ptr = id == RT_TABLE_LOCAL ? | |
e4aef8ae DL |
218 | &net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX] : |
219 | &net->ipv4.fib_table_hash[TABLE_MAIN_INDEX]; | |
a7e53531 AD |
220 | |
221 | tb_hlist = rcu_dereference_rtnl(hlist_first_rcu(ptr)); | |
222 | ||
223 | return hlist_entry(tb_hlist, struct fib_table, tb_hlist); | |
1da177e4 LT |
224 | } |
225 | ||
8ad4942c | 226 | static inline struct fib_table *fib_new_table(struct net *net, u32 id) |
1da177e4 | 227 | { |
8ad4942c | 228 | return fib_get_table(net, id); |
1da177e4 LT |
229 | } |
230 | ||
22bd5b9b | 231 | static inline int fib_lookup(struct net *net, const struct flowi4 *flp, |
0eeb075f | 232 | struct fib_result *res, unsigned int flags) |
1da177e4 | 233 | { |
a7e53531 | 234 | struct fib_table *tb; |
0ddcf43d | 235 | int err = -ENETUNREACH; |
345e9b54 AD |
236 | |
237 | rcu_read_lock(); | |
238 | ||
0ddcf43d | 239 | tb = fib_get_table(net, RT_TABLE_MAIN); |
0315e382 NF |
240 | if (tb) |
241 | err = fib_table_lookup(tb, flp, res, flags | FIB_LOOKUP_NOREF); | |
242 | ||
243 | if (err == -EAGAIN) | |
244 | err = -ENETUNREACH; | |
93456b6d | 245 | |
345e9b54 | 246 | rcu_read_unlock(); |
93456b6d | 247 | |
345e9b54 | 248 | return err; |
1da177e4 LT |
249 | } |
250 | ||
1da177e4 | 251 | #else /* CONFIG_IP_MULTIPLE_TABLES */ |
5c3a0fd7 JP |
252 | int __net_init fib4_rules_init(struct net *net); |
253 | void __net_exit fib4_rules_exit(struct net *net); | |
c3e9a353 | 254 | |
5c3a0fd7 JP |
255 | struct fib_table *fib_new_table(struct net *net, u32 id); |
256 | struct fib_table *fib_get_table(struct net *net, u32 id); | |
1da177e4 | 257 | |
0eeb075f AG |
258 | int __fib_lookup(struct net *net, struct flowi4 *flp, |
259 | struct fib_result *res, unsigned int flags); | |
f4530fa5 DM |
260 | |
261 | static inline int fib_lookup(struct net *net, struct flowi4 *flp, | |
0eeb075f | 262 | struct fib_result *res, unsigned int flags) |
f4530fa5 | 263 | { |
a7e53531 | 264 | struct fib_table *tb; |
0315e382 | 265 | int err = -ENETUNREACH; |
a7e53531 | 266 | |
0eeb075f | 267 | flags |= FIB_LOOKUP_NOREF; |
a7e53531 | 268 | if (net->ipv4.fib_has_custom_rules) |
0eeb075f | 269 | return __fib_lookup(net, flp, res, flags); |
a7e53531 AD |
270 | |
271 | rcu_read_lock(); | |
272 | ||
273 | res->tclassid = 0; | |
274 | ||
0315e382 NF |
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); | |
a7e53531 | 285 | |
0315e382 NF |
286 | out: |
287 | if (err == -EAGAIN) | |
288 | err = -ENETUNREACH; | |
a7e53531 AD |
289 | |
290 | rcu_read_unlock(); | |
291 | ||
292 | return err; | |
f4530fa5 DM |
293 | } |
294 | ||
1da177e4 LT |
295 | #endif /* CONFIG_IP_MULTIPLE_TABLES */ |
296 | ||
297 | /* Exported by fib_frontend.c */ | |
ef7c79ed | 298 | extern const struct nla_policy rtm_ipv4_policy[]; |
5c3a0fd7 JP |
299 | void ip_fib_init(void); |
300 | __be32 fib_compute_spec_dst(struct sk_buff *skb); | |
301 | int 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); | |
2392debc | 304 | void fib_select_default(const struct flowi4 *flp, struct fib_result *res); |
7a9bc9b8 | 305 | #ifdef CONFIG_IP_ROUTE_CLASSID |
f4530fa5 DM |
306 | static inline int fib_num_tclassid_users(struct net *net) |
307 | { | |
308 | return net->ipv4.fib_num_tclassid_users; | |
309 | } | |
7a9bc9b8 | 310 | #else |
f4530fa5 DM |
311 | static inline int fib_num_tclassid_users(struct net *net) |
312 | { | |
313 | return 0; | |
314 | } | |
7a9bc9b8 | 315 | #endif |
0ddcf43d | 316 | int fib_unmerge(struct net *net); |
104616e7 | 317 | void fib_flush_external(struct net *net); |
14c85021 | 318 | |
1da177e4 | 319 | /* Exported by fib_semantics.c */ |
5c3a0fd7 | 320 | int ip_fib_check_default(__be32 gw, struct net_device *dev); |
4f823def | 321 | int fib_sync_down_dev(struct net_device *dev, unsigned long event, bool force); |
5c3a0fd7 | 322 | int fib_sync_down_addr(struct net *net, __be32 local); |
8a3d0316 | 323 | int fib_sync_up(struct net_device *dev, unsigned int nh_flags); |
0e884c78 PN |
324 | |
325 | extern u32 fib_multipath_secret __read_mostly; | |
326 | ||
327 | static inline int fib_multipath_hash(__be32 saddr, __be32 daddr) | |
328 | { | |
0797cbd8 LR |
329 | return jhash_2words((__force u32)saddr, (__force u32)daddr, |
330 | fib_multipath_secret) >> 1; | |
0e884c78 PN |
331 | } |
332 | ||
333 | void fib_select_multipath(struct fib_result *res, int hash); | |
3ce58d84 DA |
334 | void fib_select_path(struct net *net, struct fib_result *res, |
335 | struct flowi4 *fl4, int mp_hash); | |
1da177e4 | 336 | |
5348ba85 | 337 | /* Exported by fib_trie.c */ |
5c3a0fd7 | 338 | void fib_trie_init(void); |
0ddcf43d | 339 | struct fib_table *fib_trie_table(u32 id, struct fib_table *alias); |
1da177e4 | 340 | |
b6bf3ca0 | 341 | static inline void fib_combine_itag(u32 *itag, const struct fib_result *res) |
1da177e4 | 342 | { |
c7066f70 | 343 | #ifdef CONFIG_IP_ROUTE_CLASSID |
1da177e4 LT |
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 | |
85b91b03 | 349 | rtag = res->tclassid; |
1da177e4 LT |
350 | if (*itag == 0) |
351 | *itag = (rtag<<16); | |
352 | *itag |= (rtag>>16); | |
353 | #endif | |
354 | #endif | |
355 | } | |
356 | ||
5c3a0fd7 | 357 | void free_fib_info(struct fib_info *fi); |
1da177e4 LT |
358 | |
359 | static 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 | ||
20380731 | 365 | #ifdef CONFIG_PROC_FS |
5c3a0fd7 JP |
366 | int __net_init fib_proc_init(struct net *net); |
367 | void __net_exit fib_proc_exit(struct net *net); | |
cc8274f5 LZ |
368 | #else |
369 | static inline int fib_proc_init(struct net *net) | |
370 | { | |
371 | return 0; | |
372 | } | |
373 | static inline void fib_proc_exit(struct net *net) | |
374 | { | |
375 | } | |
20380731 ACM |
376 | #endif |
377 | ||
1da177e4 | 378 | #endif /* _NET_FIB_H */ |