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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/*
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 <net/fib_rules.h>
22
23struct fib_config {
24 u8 fc_dst_len;
25 u8 fc_tos;
26 u8 fc_protocol;
27 u8 fc_scope;
28 u8 fc_type;
29 /* 3 bytes unused */
30 u32 fc_table;
31 __be32 fc_dst;
32 __be32 fc_gw;
33 int fc_oif;
34 u32 fc_flags;
35 u32 fc_priority;
36 __be32 fc_prefsrc;
37 struct nlattr *fc_mx;
38 struct rtnexthop *fc_mp;
39 int fc_mx_len;
40 int fc_mp_len;
41 u32 fc_flow;
42 u32 fc_nlflags;
43 struct nl_info fc_nlinfo;
44 };
45
46struct fib_info;
47
48struct fib_nh {
49 struct net_device *nh_dev;
50 struct hlist_node nh_hash;
51 struct fib_info *nh_parent;
52 unsigned int nh_flags;
53 unsigned char nh_scope;
54#ifdef CONFIG_IP_ROUTE_MULTIPATH
55 int nh_weight;
56 int nh_power;
57#endif
58#ifdef CONFIG_IP_ROUTE_CLASSID
59 __u32 nh_tclassid;
60#endif
61 int nh_oif;
62 __be32 nh_gw;
63 __be32 nh_saddr;
64 int nh_saddr_genid;
65};
66
67/*
68 * This structure contains data shared by many of routes.
69 */
70
71struct fib_info {
72 struct hlist_node fib_hash;
73 struct hlist_node fib_lhash;
74 struct net *fib_net;
75 int fib_treeref;
76 atomic_t fib_clntref;
77 unsigned int fib_flags;
78 unsigned char fib_dead;
79 unsigned char fib_protocol;
80 unsigned char fib_scope;
81 __be32 fib_prefsrc;
82 u32 fib_priority;
83 u32 *fib_metrics;
84#define fib_mtu fib_metrics[RTAX_MTU-1]
85#define fib_window fib_metrics[RTAX_WINDOW-1]
86#define fib_rtt fib_metrics[RTAX_RTT-1]
87#define fib_advmss fib_metrics[RTAX_ADVMSS-1]
88 int fib_nhs;
89#ifdef CONFIG_IP_ROUTE_MULTIPATH
90 int fib_power;
91#endif
92 struct rcu_head rcu;
93 struct fib_nh fib_nh[0];
94#define fib_dev fib_nh[0].nh_dev
95};
96
97
98#ifdef CONFIG_IP_MULTIPLE_TABLES
99struct fib_rule;
100#endif
101
102struct fib_table;
103struct fib_result {
104 unsigned char prefixlen;
105 unsigned char nh_sel;
106 unsigned char type;
107 unsigned char scope;
108 struct fib_info *fi;
109 struct fib_table *table;
110 struct list_head *fa_head;
111#ifdef CONFIG_IP_MULTIPLE_TABLES
112 struct fib_rule *r;
113#endif
114};
115
116struct fib_result_nl {
117 __be32 fl_addr; /* To be looked up*/
118 u32 fl_mark;
119 unsigned char fl_tos;
120 unsigned char fl_scope;
121 unsigned char tb_id_in;
122
123 unsigned char tb_id; /* Results */
124 unsigned char prefixlen;
125 unsigned char nh_sel;
126 unsigned char type;
127 unsigned char scope;
128 int err;
129};
130
131#ifdef CONFIG_IP_ROUTE_MULTIPATH
132
133#define FIB_RES_NH(res) ((res).fi->fib_nh[(res).nh_sel])
134
135#define FIB_TABLE_HASHSZ 2
136
137#else /* CONFIG_IP_ROUTE_MULTIPATH */
138
139#define FIB_RES_NH(res) ((res).fi->fib_nh[0])
140
141#define FIB_TABLE_HASHSZ 256
142
143#endif /* CONFIG_IP_ROUTE_MULTIPATH */
144
145extern __be32 fib_info_update_nh_saddr(struct net *net, struct fib_nh *nh);
146
147#define FIB_RES_SADDR(net, res) \
148 ((FIB_RES_NH(res).nh_saddr_genid == \
149 atomic_read(&(net)->ipv4.dev_addr_genid)) ? \
150 FIB_RES_NH(res).nh_saddr : \
151 fib_info_update_nh_saddr((net), &FIB_RES_NH(res)))
152#define FIB_RES_GW(res) (FIB_RES_NH(res).nh_gw)
153#define FIB_RES_DEV(res) (FIB_RES_NH(res).nh_dev)
154#define FIB_RES_OIF(res) (FIB_RES_NH(res).nh_oif)
155
156#define FIB_RES_PREFSRC(net, res) ((res).fi->fib_prefsrc ? : \
157 FIB_RES_SADDR(net, res))
158
159struct fib_table {
160 struct hlist_node tb_hlist;
161 u32 tb_id;
162 int tb_default;
163 int tb_num_default;
164 unsigned long tb_data[0];
165};
166
167extern int fib_table_lookup(struct fib_table *tb, const struct flowi4 *flp,
168 struct fib_result *res, int fib_flags);
169extern int fib_table_insert(struct fib_table *, struct fib_config *);
170extern int fib_table_delete(struct fib_table *, struct fib_config *);
171extern int fib_table_dump(struct fib_table *table, struct sk_buff *skb,
172 struct netlink_callback *cb);
173extern int fib_table_flush(struct fib_table *table);
174extern void fib_free_table(struct fib_table *tb);
175
176
177
178#ifndef CONFIG_IP_MULTIPLE_TABLES
179
180#define TABLE_LOCAL_INDEX 0
181#define TABLE_MAIN_INDEX 1
182
183static inline struct fib_table *fib_get_table(struct net *net, u32 id)
184{
185 struct hlist_head *ptr;
186
187 ptr = id == RT_TABLE_LOCAL ?
188 &net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX] :
189 &net->ipv4.fib_table_hash[TABLE_MAIN_INDEX];
190 return hlist_entry(ptr->first, struct fib_table, tb_hlist);
191}
192
193static inline struct fib_table *fib_new_table(struct net *net, u32 id)
194{
195 return fib_get_table(net, id);
196}
197
198static inline int fib_lookup(struct net *net, const struct flowi4 *flp,
199 struct fib_result *res)
200{
201 struct fib_table *table;
202
203 table = fib_get_table(net, RT_TABLE_LOCAL);
204 if (!fib_table_lookup(table, flp, res, FIB_LOOKUP_NOREF))
205 return 0;
206
207 table = fib_get_table(net, RT_TABLE_MAIN);
208 if (!fib_table_lookup(table, flp, res, FIB_LOOKUP_NOREF))
209 return 0;
210 return -ENETUNREACH;
211}
212
213#else /* CONFIG_IP_MULTIPLE_TABLES */
214extern int __net_init fib4_rules_init(struct net *net);
215extern void __net_exit fib4_rules_exit(struct net *net);
216
217#ifdef CONFIG_IP_ROUTE_CLASSID
218extern u32 fib_rules_tclass(const struct fib_result *res);
219#endif
220
221extern int fib_lookup(struct net *n, struct flowi4 *flp, struct fib_result *res);
222
223extern struct fib_table *fib_new_table(struct net *net, u32 id);
224extern struct fib_table *fib_get_table(struct net *net, u32 id);
225
226#endif /* CONFIG_IP_MULTIPLE_TABLES */
227
228/* Exported by fib_frontend.c */
229extern const struct nla_policy rtm_ipv4_policy[];
230extern void ip_fib_init(void);
231extern int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst,
232 u8 tos, int oif, struct net_device *dev,
233 __be32 *spec_dst, u32 *itag);
234extern void fib_select_default(struct fib_result *res);
235
236/* Exported by fib_semantics.c */
237extern int ip_fib_check_default(__be32 gw, struct net_device *dev);
238extern int fib_sync_down_dev(struct net_device *dev, int force);
239extern int fib_sync_down_addr(struct net *net, __be32 local);
240extern void fib_update_nh_saddrs(struct net_device *dev);
241extern int fib_sync_up(struct net_device *dev);
242extern void fib_select_multipath(struct fib_result *res);
243
244/* Exported by fib_trie.c */
245extern void fib_trie_init(void);
246extern struct fib_table *fib_trie_table(u32 id);
247
248static inline void fib_combine_itag(u32 *itag, const struct fib_result *res)
249{
250#ifdef CONFIG_IP_ROUTE_CLASSID
251#ifdef CONFIG_IP_MULTIPLE_TABLES
252 u32 rtag;
253#endif
254 *itag = FIB_RES_NH(*res).nh_tclassid<<16;
255#ifdef CONFIG_IP_MULTIPLE_TABLES
256 rtag = fib_rules_tclass(res);
257 if (*itag == 0)
258 *itag = (rtag<<16);
259 *itag |= (rtag>>16);
260#endif
261#endif
262}
263
264extern void free_fib_info(struct fib_info *fi);
265
266static inline void fib_info_put(struct fib_info *fi)
267{
268 if (atomic_dec_and_test(&fi->fib_clntref))
269 free_fib_info(fi);
270}
271
272#ifdef CONFIG_PROC_FS
273extern int __net_init fib_proc_init(struct net *net);
274extern void __net_exit fib_proc_exit(struct net *net);
275#else
276static inline int fib_proc_init(struct net *net)
277{
278 return 0;
279}
280static inline void fib_proc_exit(struct net *net)
281{
282}
283#endif
284
285#endif /* _NET_FIB_H */