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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_notifier.h>
23#include <net/fib_rules.h>
24#include <net/inetpeer.h>
25#include <linux/percpu.h>
26#include <linux/notifier.h>
27#include <linux/refcount.h>
28
29struct fib_config {
30 u8 fc_dst_len;
31 u8 fc_tos;
32 u8 fc_protocol;
33 u8 fc_scope;
34 u8 fc_type;
35 /* 3 bytes unused */
36 u32 fc_table;
37 __be32 fc_dst;
38 __be32 fc_gw;
39 int fc_oif;
40 u32 fc_flags;
41 u32 fc_priority;
42 __be32 fc_prefsrc;
43 struct nlattr *fc_mx;
44 struct rtnexthop *fc_mp;
45 int fc_mx_len;
46 int fc_mp_len;
47 u32 fc_flow;
48 u32 fc_nlflags;
49 struct nl_info fc_nlinfo;
50 struct nlattr *fc_encap;
51 u16 fc_encap_type;
52};
53
54struct fib_info;
55struct rtable;
56
57struct fib_nh_exception {
58 struct fib_nh_exception __rcu *fnhe_next;
59 int fnhe_genid;
60 __be32 fnhe_daddr;
61 u32 fnhe_pmtu;
62 bool fnhe_mtu_locked;
63 __be32 fnhe_gw;
64 unsigned long fnhe_expires;
65 struct rtable __rcu *fnhe_rth_input;
66 struct rtable __rcu *fnhe_rth_output;
67 unsigned long fnhe_stamp;
68 struct rcu_head rcu;
69};
70
71struct fnhe_hash_bucket {
72 struct fib_nh_exception __rcu *chain;
73};
74
75#define FNHE_HASH_SHIFT 11
76#define FNHE_HASH_SIZE (1 << FNHE_HASH_SHIFT)
77#define FNHE_RECLAIM_DEPTH 5
78
79struct fib_nh {
80 struct net_device *nh_dev;
81 struct hlist_node nh_hash;
82 struct fib_info *nh_parent;
83 unsigned int nh_flags;
84 unsigned char nh_scope;
85#ifdef CONFIG_IP_ROUTE_MULTIPATH
86 int nh_weight;
87 atomic_t nh_upper_bound;
88#endif
89#ifdef CONFIG_IP_ROUTE_CLASSID
90 __u32 nh_tclassid;
91#endif
92 int nh_oif;
93 __be32 nh_gw;
94 __be32 nh_saddr;
95 int nh_saddr_genid;
96 struct rtable __rcu * __percpu *nh_pcpu_rth_output;
97 struct rtable __rcu *nh_rth_input;
98 struct fnhe_hash_bucket __rcu *nh_exceptions;
99 struct lwtunnel_state *nh_lwtstate;
100};
101
102/*
103 * This structure contains data shared by many of routes.
104 */
105
106struct fib_info {
107 struct hlist_node fib_hash;
108 struct hlist_node fib_lhash;
109 struct net *fib_net;
110 int fib_treeref;
111 refcount_t fib_clntref;
112 unsigned int fib_flags;
113 unsigned char fib_dead;
114 unsigned char fib_protocol;
115 unsigned char fib_scope;
116 unsigned char fib_type;
117 __be32 fib_prefsrc;
118 u32 fib_tb_id;
119 u32 fib_priority;
120 struct dst_metrics *fib_metrics;
121#define fib_mtu fib_metrics->metrics[RTAX_MTU-1]
122#define fib_window fib_metrics->metrics[RTAX_WINDOW-1]
123#define fib_rtt fib_metrics->metrics[RTAX_RTT-1]
124#define fib_advmss fib_metrics->metrics[RTAX_ADVMSS-1]
125 int fib_nhs;
126 struct rcu_head rcu;
127 struct fib_nh fib_nh[0];
128#define fib_dev fib_nh[0].nh_dev
129};
130
131
132#ifdef CONFIG_IP_MULTIPLE_TABLES
133struct fib_rule;
134#endif
135
136struct fib_table;
137struct fib_result {
138 __be32 prefix;
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
178#define FIB_RES_SADDR(net, res) \
179 ((FIB_RES_NH(res).nh_saddr_genid == \
180 atomic_read(&(net)->ipv4.dev_addr_genid)) ? \
181 FIB_RES_NH(res).nh_saddr : \
182 fib_info_update_nh_saddr((net), &FIB_RES_NH(res)))
183#define FIB_RES_GW(res) (FIB_RES_NH(res).nh_gw)
184#define FIB_RES_DEV(res) (FIB_RES_NH(res).nh_dev)
185#define FIB_RES_OIF(res) (FIB_RES_NH(res).nh_oif)
186
187#define FIB_RES_PREFSRC(net, res) ((res).fi->fib_prefsrc ? : \
188 FIB_RES_SADDR(net, res))
189
190struct fib_entry_notifier_info {
191 struct fib_notifier_info info; /* must be first */
192 u32 dst;
193 int dst_len;
194 struct fib_info *fi;
195 u8 tos;
196 u8 type;
197 u32 tb_id;
198};
199
200struct fib_nh_notifier_info {
201 struct fib_notifier_info info; /* must be first */
202 struct fib_nh *fib_nh;
203};
204
205int call_fib4_notifier(struct notifier_block *nb, struct net *net,
206 enum fib_event_type event_type,
207 struct fib_notifier_info *info);
208int call_fib4_notifiers(struct net *net, enum fib_event_type event_type,
209 struct fib_notifier_info *info);
210
211int __net_init fib4_notifier_init(struct net *net);
212void __net_exit fib4_notifier_exit(struct net *net);
213
214void fib_notify(struct net *net, struct notifier_block *nb);
215
216struct fib_table {
217 struct hlist_node tb_hlist;
218 u32 tb_id;
219 int tb_num_default;
220 struct rcu_head rcu;
221 unsigned long *tb_data;
222 unsigned long __data[0];
223};
224
225int fib_table_lookup(struct fib_table *tb, const struct flowi4 *flp,
226 struct fib_result *res, int fib_flags);
227int fib_table_insert(struct net *, struct fib_table *, struct fib_config *,
228 struct netlink_ext_ack *extack);
229int fib_table_delete(struct net *, struct fib_table *, struct fib_config *,
230 struct netlink_ext_ack *extack);
231int fib_table_dump(struct fib_table *table, struct sk_buff *skb,
232 struct netlink_callback *cb);
233int fib_table_flush(struct net *net, struct fib_table *table);
234struct fib_table *fib_trie_unmerge(struct fib_table *main_tb);
235void fib_table_flush_external(struct fib_table *table);
236void fib_free_table(struct fib_table *tb);
237
238#ifndef CONFIG_IP_MULTIPLE_TABLES
239
240#define TABLE_LOCAL_INDEX (RT_TABLE_LOCAL & (FIB_TABLE_HASHSZ - 1))
241#define TABLE_MAIN_INDEX (RT_TABLE_MAIN & (FIB_TABLE_HASHSZ - 1))
242
243static inline struct fib_table *fib_get_table(struct net *net, u32 id)
244{
245 struct hlist_node *tb_hlist;
246 struct hlist_head *ptr;
247
248 ptr = id == RT_TABLE_LOCAL ?
249 &net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX] :
250 &net->ipv4.fib_table_hash[TABLE_MAIN_INDEX];
251
252 tb_hlist = rcu_dereference_rtnl(hlist_first_rcu(ptr));
253
254 return hlist_entry(tb_hlist, struct fib_table, tb_hlist);
255}
256
257static inline struct fib_table *fib_new_table(struct net *net, u32 id)
258{
259 return fib_get_table(net, id);
260}
261
262static inline int fib_lookup(struct net *net, const struct flowi4 *flp,
263 struct fib_result *res, unsigned int flags)
264{
265 struct fib_table *tb;
266 int err = -ENETUNREACH;
267
268 rcu_read_lock();
269
270 tb = fib_get_table(net, RT_TABLE_MAIN);
271 if (tb)
272 err = fib_table_lookup(tb, flp, res, flags | FIB_LOOKUP_NOREF);
273
274 if (err == -EAGAIN)
275 err = -ENETUNREACH;
276
277 rcu_read_unlock();
278
279 return err;
280}
281
282static inline bool fib4_rule_default(const struct fib_rule *rule)
283{
284 return true;
285}
286
287static inline int fib4_rules_dump(struct net *net, struct notifier_block *nb)
288{
289 return 0;
290}
291
292static inline unsigned int fib4_rules_seq_read(struct net *net)
293{
294 return 0;
295}
296
297static inline bool fib4_rules_early_flow_dissect(struct net *net,
298 struct sk_buff *skb,
299 struct flowi4 *fl4,
300 struct flow_keys *flkeys)
301{
302 return false;
303}
304#else /* CONFIG_IP_MULTIPLE_TABLES */
305int __net_init fib4_rules_init(struct net *net);
306void __net_exit fib4_rules_exit(struct net *net);
307
308struct fib_table *fib_new_table(struct net *net, u32 id);
309struct fib_table *fib_get_table(struct net *net, u32 id);
310
311int __fib_lookup(struct net *net, struct flowi4 *flp,
312 struct fib_result *res, unsigned int flags);
313
314static inline int fib_lookup(struct net *net, struct flowi4 *flp,
315 struct fib_result *res, unsigned int flags)
316{
317 struct fib_table *tb;
318 int err = -ENETUNREACH;
319
320 flags |= FIB_LOOKUP_NOREF;
321 if (net->ipv4.fib_has_custom_rules)
322 return __fib_lookup(net, flp, res, flags);
323
324 rcu_read_lock();
325
326 res->tclassid = 0;
327
328 tb = rcu_dereference_rtnl(net->ipv4.fib_main);
329 if (tb)
330 err = fib_table_lookup(tb, flp, res, flags);
331
332 if (!err)
333 goto out;
334
335 tb = rcu_dereference_rtnl(net->ipv4.fib_default);
336 if (tb)
337 err = fib_table_lookup(tb, flp, res, flags);
338
339out:
340 if (err == -EAGAIN)
341 err = -ENETUNREACH;
342
343 rcu_read_unlock();
344
345 return err;
346}
347
348bool fib4_rule_default(const struct fib_rule *rule);
349int fib4_rules_dump(struct net *net, struct notifier_block *nb);
350unsigned int fib4_rules_seq_read(struct net *net);
351
352static 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 unsigned int flag = FLOW_DISSECTOR_F_STOP_AT_ENCAP;
358
359 if (!net->ipv4.fib_rules_require_fldissect)
360 return false;
361
362 skb_flow_dissect_flow_keys(skb, flkeys, flag);
363 fl4->fl4_sport = flkeys->ports.src;
364 fl4->fl4_dport = flkeys->ports.dst;
365 fl4->flowi4_proto = flkeys->basic.ip_proto;
366
367 return true;
368}
369
370#endif /* CONFIG_IP_MULTIPLE_TABLES */
371
372/* Exported by fib_frontend.c */
373extern const struct nla_policy rtm_ipv4_policy[];
374void ip_fib_init(void);
375__be32 fib_compute_spec_dst(struct sk_buff *skb);
376int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst,
377 u8 tos, int oif, struct net_device *dev,
378 struct in_device *idev, u32 *itag);
379#ifdef CONFIG_IP_ROUTE_CLASSID
380static inline int fib_num_tclassid_users(struct net *net)
381{
382 return net->ipv4.fib_num_tclassid_users;
383}
384#else
385static inline int fib_num_tclassid_users(struct net *net)
386{
387 return 0;
388}
389#endif
390int fib_unmerge(struct net *net);
391
392/* Exported by fib_semantics.c */
393int ip_fib_check_default(__be32 gw, struct net_device *dev);
394int fib_sync_down_dev(struct net_device *dev, unsigned long event, bool force);
395int fib_sync_down_addr(struct net_device *dev, __be32 local);
396int fib_sync_up(struct net_device *dev, unsigned int nh_flags);
397
398#ifdef CONFIG_IP_ROUTE_MULTIPATH
399int fib_multipath_hash(const struct net *net, const struct flowi4 *fl4,
400 const struct sk_buff *skb, struct flow_keys *flkeys);
401#endif
402void fib_select_multipath(struct fib_result *res, int hash);
403void fib_select_path(struct net *net, struct fib_result *res,
404 struct flowi4 *fl4, const struct sk_buff *skb);
405
406/* Exported by fib_trie.c */
407void fib_trie_init(void);
408struct fib_table *fib_trie_table(u32 id, struct fib_table *alias);
409
410static inline void fib_combine_itag(u32 *itag, const struct fib_result *res)
411{
412#ifdef CONFIG_IP_ROUTE_CLASSID
413#ifdef CONFIG_IP_MULTIPLE_TABLES
414 u32 rtag;
415#endif
416 *itag = FIB_RES_NH(*res).nh_tclassid<<16;
417#ifdef CONFIG_IP_MULTIPLE_TABLES
418 rtag = res->tclassid;
419 if (*itag == 0)
420 *itag = (rtag<<16);
421 *itag |= (rtag>>16);
422#endif
423#endif
424}
425
426void free_fib_info(struct fib_info *fi);
427
428static inline void fib_info_hold(struct fib_info *fi)
429{
430 refcount_inc(&fi->fib_clntref);
431}
432
433static inline void fib_info_put(struct fib_info *fi)
434{
435 if (refcount_dec_and_test(&fi->fib_clntref))
436 free_fib_info(fi);
437}
438
439#ifdef CONFIG_PROC_FS
440int __net_init fib_proc_init(struct net *net);
441void __net_exit fib_proc_exit(struct net *net);
442#else
443static inline int fib_proc_init(struct net *net)
444{
445 return 0;
446}
447static inline void fib_proc_exit(struct net *net)
448{
449}
450#endif
451
452#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/inet_dscp.h>
21#include <net/inetpeer.h>
22#include <linux/percpu.h>
23#include <linux/notifier.h>
24#include <linux/refcount.h>
25
26struct 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
56struct fib_info;
57struct rtable;
58
59struct 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
73struct 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
81struct 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
105struct 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
132struct nexthop;
133
134struct 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
165struct fib_rule;
166#endif
167
168struct fib_table;
169struct 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
182struct 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
211struct 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
224struct 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
234struct fib_nh_notifier_info {
235 struct fib_notifier_info info; /* must be first */
236 struct fib_nh *fib_nh;
237};
238
239int call_fib4_notifier(struct notifier_block *nb,
240 enum fib_event_type event_type,
241 struct fib_notifier_info *info);
242int call_fib4_notifiers(struct net *net, enum fib_event_type event_type,
243 struct fib_notifier_info *info);
244
245int __net_init fib4_notifier_init(struct net *net);
246void __net_exit fib4_notifier_exit(struct net *net);
247
248void fib_info_notify_update(struct net *net, struct nl_info *info);
249int fib_notify(struct net *net, struct notifier_block *nb,
250 struct netlink_ext_ack *extack);
251
252struct 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
261struct 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
274int fib_table_lookup(struct fib_table *tb, const struct flowi4 *flp,
275 struct fib_result *res, int fib_flags);
276int fib_table_insert(struct net *, struct fib_table *, struct fib_config *,
277 struct netlink_ext_ack *extack);
278int fib_table_delete(struct net *, struct fib_table *, struct fib_config *,
279 struct netlink_ext_ack *extack);
280int fib_table_dump(struct fib_table *table, struct sk_buff *skb,
281 struct netlink_callback *cb, struct fib_dump_filter *filter);
282int fib_table_flush(struct net *net, struct fib_table *table, bool flush_all);
283struct fib_table *fib_trie_unmerge(struct fib_table *main_tb);
284void fib_table_flush_external(struct fib_table *table);
285void 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
292static 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
306static inline struct fib_table *fib_new_table(struct net *net, u32 id)
307{
308 return fib_get_table(net, id);
309}
310
311static 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
331static inline bool fib4_has_custom_rules(const struct net *net)
332{
333 return false;
334}
335
336static inline bool fib4_rule_default(const struct fib_rule *rule)
337{
338 return true;
339}
340
341static inline int fib4_rules_dump(struct net *net, struct notifier_block *nb,
342 struct netlink_ext_ack *extack)
343{
344 return 0;
345}
346
347static inline unsigned int fib4_rules_seq_read(struct net *net)
348{
349 return 0;
350}
351
352static 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 */
360int __net_init fib4_rules_init(struct net *net);
361void __net_exit fib4_rules_exit(struct net *net);
362
363struct fib_table *fib_new_table(struct net *net, u32 id);
364struct fib_table *fib_get_table(struct net *net, u32 id);
365
366int __fib_lookup(struct net *net, struct flowi4 *flp,
367 struct fib_result *res, unsigned int flags);
368
369static 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, 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, flags);
393
394out:
395 if (err == -EAGAIN)
396 err = -ENETUNREACH;
397
398 rcu_read_unlock();
399
400 return err;
401}
402
403static inline bool fib4_has_custom_rules(const struct net *net)
404{
405 return net->ipv4.fib_has_custom_rules;
406}
407
408bool fib4_rule_default(const struct fib_rule *rule);
409int fib4_rules_dump(struct net *net, struct notifier_block *nb,
410 struct netlink_ext_ack *extack);
411unsigned int fib4_rules_seq_read(struct net *net);
412
413static 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_keys_dissector,
425 flkeys, NULL, 0, 0, 0, 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 */
437extern const struct nla_policy rtm_ipv4_policy[];
438void ip_fib_init(void);
439int 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);
442bool fib_info_nh_uses_dev(struct fib_info *fi, const struct net_device *dev);
443int 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
447static inline int fib_num_tclassid_users(struct net *net)
448{
449 return atomic_read(&net->ipv4.fib_num_tclassid_users);
450}
451#else
452static inline int fib_num_tclassid_users(struct net *net)
453{
454 return 0;
455}
456#endif
457int fib_unmerge(struct net *net);
458
459static inline bool nhc_l3mdev_matches_dev(const struct fib_nh_common *nhc,
460const struct net_device *dev)
461{
462 if (nhc->nhc_dev == dev ||
463 l3mdev_master_ifindex_rcu(nhc->nhc_dev) == dev->ifindex)
464 return true;
465
466 return false;
467}
468
469/* Exported by fib_semantics.c */
470int ip_fib_check_default(__be32 gw, struct net_device *dev);
471int fib_sync_down_dev(struct net_device *dev, unsigned long event, bool force);
472int fib_sync_down_addr(struct net_device *dev, __be32 local);
473int fib_sync_up(struct net_device *dev, unsigned char nh_flags);
474void fib_sync_mtu(struct net_device *dev, u32 orig_mtu);
475void 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
521int fib_multipath_hash(const struct net *net, const struct flowi4 *fl4,
522 const struct sk_buff *skb, struct flow_keys *flkeys);
523#endif
524int fib_check_nh(struct net *net, struct fib_nh *nh, u32 table, u8 scope,
525 struct netlink_ext_ack *extack);
526void fib_select_multipath(struct fib_result *res, int hash);
527void fib_select_path(struct net *net, struct fib_result *res,
528 struct flowi4 *fl4, const struct sk_buff *skb);
529
530int 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);
533void fib_nh_release(struct net *net, struct fib_nh *fib_nh);
534int 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);
538void fib_nh_common_release(struct fib_nh_common *nhc);
539
540/* Exported by fib_trie.c */
541void fib_alias_hw_flags_set(struct net *net, const struct fib_rt_info *fri);
542void fib_trie_init(void);
543struct fib_table *fib_trie_table(u32 id, struct fib_table *alias);
544bool fib_lookup_good_nhc(const struct fib_nh_common *nhc, int fib_flags,
545 const struct flowi4 *flp);
546
547static 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
572void fib_flush(struct net *net);
573void free_fib_info(struct fib_info *fi);
574
575static inline void fib_info_hold(struct fib_info *fi)
576{
577 refcount_inc(&fi->fib_clntref);
578}
579
580static inline void fib_info_put(struct fib_info *fi)
581{
582 if (refcount_dec_and_test(&fi->fib_clntref))
583 free_fib_info(fi);
584}
585
586#ifdef CONFIG_PROC_FS
587int __net_init fib_proc_init(struct net *net);
588void __net_exit fib_proc_exit(struct net *net);
589#else
590static inline int fib_proc_init(struct net *net)
591{
592 return 0;
593}
594static inline void fib_proc_exit(struct net *net)
595{
596}
597#endif
598
599u32 ip_mtu_from_fib_result(struct fib_result *res, __be32 daddr);
600
601int ip_valid_fib_dump_req(struct net *net, const struct nlmsghdr *nlh,
602 struct fib_dump_filter *filter,
603 struct netlink_callback *cb);
604
605int fib_nexthop_info(struct sk_buff *skb, const struct fib_nh_common *nh,
606 u8 rt_family, unsigned char *flags, bool skip_oif);
607int 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 */