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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/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 struct nexthop *nh;
158 struct rcu_head rcu;
159 struct fib_nh fib_nh[];
160};
161
162
163#ifdef CONFIG_IP_MULTIPLE_TABLES
164struct fib_rule;
165#endif
166
167struct fib_table;
168struct fib_result {
169 __be32 prefix;
170 unsigned char prefixlen;
171 unsigned char nh_sel;
172 unsigned char type;
173 unsigned char scope;
174 u32 tclassid;
175 struct fib_nh_common *nhc;
176 struct fib_info *fi;
177 struct fib_table *table;
178 struct hlist_head *fa_head;
179};
180
181struct fib_result_nl {
182 __be32 fl_addr; /* To be looked up*/
183 u32 fl_mark;
184 unsigned char fl_tos;
185 unsigned char fl_scope;
186 unsigned char tb_id_in;
187
188 unsigned char tb_id; /* Results */
189 unsigned char prefixlen;
190 unsigned char nh_sel;
191 unsigned char type;
192 unsigned char scope;
193 int err;
194};
195
196#ifdef CONFIG_IP_MULTIPLE_TABLES
197#define FIB_TABLE_HASHSZ 256
198#else
199#define FIB_TABLE_HASHSZ 2
200#endif
201
202__be32 fib_info_update_nhc_saddr(struct net *net, struct fib_nh_common *nhc,
203 unsigned char scope);
204__be32 fib_result_prefsrc(struct net *net, struct fib_result *res);
205
206#define FIB_RES_NHC(res) ((res).nhc)
207#define FIB_RES_DEV(res) (FIB_RES_NHC(res)->nhc_dev)
208#define FIB_RES_OIF(res) (FIB_RES_NHC(res)->nhc_oif)
209
210struct fib_rt_info {
211 struct fib_info *fi;
212 u32 tb_id;
213 __be32 dst;
214 int dst_len;
215 dscp_t dscp;
216 u8 type;
217 u8 offload:1,
218 trap:1,
219 offload_failed:1,
220 unused:5;
221};
222
223struct fib_entry_notifier_info {
224 struct fib_notifier_info info; /* must be first */
225 u32 dst;
226 int dst_len;
227 struct fib_info *fi;
228 dscp_t dscp;
229 u8 type;
230 u32 tb_id;
231};
232
233struct fib_nh_notifier_info {
234 struct fib_notifier_info info; /* must be first */
235 struct fib_nh *fib_nh;
236};
237
238int call_fib4_notifier(struct notifier_block *nb,
239 enum fib_event_type event_type,
240 struct fib_notifier_info *info);
241int call_fib4_notifiers(struct net *net, enum fib_event_type event_type,
242 struct fib_notifier_info *info);
243
244int __net_init fib4_notifier_init(struct net *net);
245void __net_exit fib4_notifier_exit(struct net *net);
246
247void fib_info_notify_update(struct net *net, struct nl_info *info);
248int fib_notify(struct net *net, struct notifier_block *nb,
249 struct netlink_ext_ack *extack);
250
251struct fib_table {
252 struct hlist_node tb_hlist;
253 u32 tb_id;
254 int tb_num_default;
255 struct rcu_head rcu;
256 unsigned long *tb_data;
257 unsigned long __data[];
258};
259
260struct fib_dump_filter {
261 u32 table_id;
262 /* filter_set is an optimization that an entry is set */
263 bool filter_set;
264 bool dump_routes;
265 bool dump_exceptions;
266 unsigned char protocol;
267 unsigned char rt_type;
268 unsigned int flags;
269 struct net_device *dev;
270};
271
272int fib_table_lookup(struct fib_table *tb, const struct flowi4 *flp,
273 struct fib_result *res, int fib_flags);
274int fib_table_insert(struct net *, struct fib_table *, struct fib_config *,
275 struct netlink_ext_ack *extack);
276int fib_table_delete(struct net *, struct fib_table *, struct fib_config *,
277 struct netlink_ext_ack *extack);
278int fib_table_dump(struct fib_table *table, struct sk_buff *skb,
279 struct netlink_callback *cb, struct fib_dump_filter *filter);
280int fib_table_flush(struct net *net, struct fib_table *table, bool flush_all);
281struct fib_table *fib_trie_unmerge(struct fib_table *main_tb);
282void fib_table_flush_external(struct fib_table *table);
283void fib_free_table(struct fib_table *tb);
284
285#ifndef CONFIG_IP_MULTIPLE_TABLES
286
287#define TABLE_LOCAL_INDEX (RT_TABLE_LOCAL & (FIB_TABLE_HASHSZ - 1))
288#define TABLE_MAIN_INDEX (RT_TABLE_MAIN & (FIB_TABLE_HASHSZ - 1))
289
290static inline struct fib_table *fib_get_table(struct net *net, u32 id)
291{
292 struct hlist_node *tb_hlist;
293 struct hlist_head *ptr;
294
295 ptr = id == RT_TABLE_LOCAL ?
296 &net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX] :
297 &net->ipv4.fib_table_hash[TABLE_MAIN_INDEX];
298
299 tb_hlist = rcu_dereference_rtnl(hlist_first_rcu(ptr));
300
301 return hlist_entry(tb_hlist, struct fib_table, tb_hlist);
302}
303
304static inline struct fib_table *fib_new_table(struct net *net, u32 id)
305{
306 return fib_get_table(net, id);
307}
308
309static inline int fib_lookup(struct net *net, const struct flowi4 *flp,
310 struct fib_result *res, unsigned int flags)
311{
312 struct fib_table *tb;
313 int err = -ENETUNREACH;
314
315 rcu_read_lock();
316
317 tb = fib_get_table(net, RT_TABLE_MAIN);
318 if (tb)
319 err = fib_table_lookup(tb, flp, res, flags | FIB_LOOKUP_NOREF);
320
321 if (err == -EAGAIN)
322 err = -ENETUNREACH;
323
324 rcu_read_unlock();
325
326 return err;
327}
328
329static inline bool fib4_has_custom_rules(const struct net *net)
330{
331 return false;
332}
333
334static inline bool fib4_rule_default(const struct fib_rule *rule)
335{
336 return true;
337}
338
339static inline int fib4_rules_dump(struct net *net, struct notifier_block *nb,
340 struct netlink_ext_ack *extack)
341{
342 return 0;
343}
344
345static inline unsigned int fib4_rules_seq_read(struct net *net)
346{
347 return 0;
348}
349
350static inline bool fib4_rules_early_flow_dissect(struct net *net,
351 struct sk_buff *skb,
352 struct flowi4 *fl4,
353 struct flow_keys *flkeys)
354{
355 return false;
356}
357#else /* CONFIG_IP_MULTIPLE_TABLES */
358int __net_init fib4_rules_init(struct net *net);
359void __net_exit fib4_rules_exit(struct net *net);
360
361struct fib_table *fib_new_table(struct net *net, u32 id);
362struct fib_table *fib_get_table(struct net *net, u32 id);
363
364int __fib_lookup(struct net *net, struct flowi4 *flp,
365 struct fib_result *res, unsigned int flags);
366
367static inline int fib_lookup(struct net *net, struct flowi4 *flp,
368 struct fib_result *res, unsigned int flags)
369{
370 struct fib_table *tb;
371 int err = -ENETUNREACH;
372
373 flags |= FIB_LOOKUP_NOREF;
374 if (net->ipv4.fib_has_custom_rules)
375 return __fib_lookup(net, flp, res, flags);
376
377 rcu_read_lock();
378
379 res->tclassid = 0;
380
381 tb = rcu_dereference_rtnl(net->ipv4.fib_main);
382 if (tb)
383 err = fib_table_lookup(tb, flp, res, flags);
384
385 if (!err)
386 goto out;
387
388 tb = rcu_dereference_rtnl(net->ipv4.fib_default);
389 if (tb)
390 err = fib_table_lookup(tb, flp, res, flags);
391
392out:
393 if (err == -EAGAIN)
394 err = -ENETUNREACH;
395
396 rcu_read_unlock();
397
398 return err;
399}
400
401static inline bool fib4_has_custom_rules(const struct net *net)
402{
403 return net->ipv4.fib_has_custom_rules;
404}
405
406bool fib4_rule_default(const struct fib_rule *rule);
407int fib4_rules_dump(struct net *net, struct notifier_block *nb,
408 struct netlink_ext_ack *extack);
409unsigned int fib4_rules_seq_read(struct net *net);
410
411static inline bool fib4_rules_early_flow_dissect(struct net *net,
412 struct sk_buff *skb,
413 struct flowi4 *fl4,
414 struct flow_keys *flkeys)
415{
416 unsigned int flag = FLOW_DISSECTOR_F_STOP_AT_ENCAP;
417
418 if (!net->ipv4.fib_rules_require_fldissect)
419 return false;
420
421 skb_flow_dissect_flow_keys(skb, flkeys, flag);
422 fl4->fl4_sport = flkeys->ports.src;
423 fl4->fl4_dport = flkeys->ports.dst;
424 fl4->flowi4_proto = flkeys->basic.ip_proto;
425
426 return true;
427}
428
429#endif /* CONFIG_IP_MULTIPLE_TABLES */
430
431/* Exported by fib_frontend.c */
432extern const struct nla_policy rtm_ipv4_policy[];
433void ip_fib_init(void);
434int fib_gw_from_via(struct fib_config *cfg, struct nlattr *nla,
435 struct netlink_ext_ack *extack);
436__be32 fib_compute_spec_dst(struct sk_buff *skb);
437bool fib_info_nh_uses_dev(struct fib_info *fi, const struct net_device *dev);
438int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst,
439 u8 tos, int oif, struct net_device *dev,
440 struct in_device *idev, u32 *itag);
441#ifdef CONFIG_IP_ROUTE_CLASSID
442static inline int fib_num_tclassid_users(struct net *net)
443{
444 return atomic_read(&net->ipv4.fib_num_tclassid_users);
445}
446#else
447static inline int fib_num_tclassid_users(struct net *net)
448{
449 return 0;
450}
451#endif
452int fib_unmerge(struct net *net);
453
454static inline bool nhc_l3mdev_matches_dev(const struct fib_nh_common *nhc,
455const struct net_device *dev)
456{
457 if (nhc->nhc_dev == dev ||
458 l3mdev_master_ifindex_rcu(nhc->nhc_dev) == dev->ifindex)
459 return true;
460
461 return false;
462}
463
464/* Exported by fib_semantics.c */
465int ip_fib_check_default(__be32 gw, struct net_device *dev);
466int fib_sync_down_dev(struct net_device *dev, unsigned long event, bool force);
467int fib_sync_down_addr(struct net_device *dev, __be32 local);
468int fib_sync_up(struct net_device *dev, unsigned char nh_flags);
469void fib_sync_mtu(struct net_device *dev, u32 orig_mtu);
470void fib_nhc_update_mtu(struct fib_nh_common *nhc, u32 new, u32 orig);
471
472/* Fields used for sysctl_fib_multipath_hash_fields.
473 * Common to IPv4 and IPv6.
474 *
475 * Add new fields at the end. This is user API.
476 */
477#define FIB_MULTIPATH_HASH_FIELD_SRC_IP BIT(0)
478#define FIB_MULTIPATH_HASH_FIELD_DST_IP BIT(1)
479#define FIB_MULTIPATH_HASH_FIELD_IP_PROTO BIT(2)
480#define FIB_MULTIPATH_HASH_FIELD_FLOWLABEL BIT(3)
481#define FIB_MULTIPATH_HASH_FIELD_SRC_PORT BIT(4)
482#define FIB_MULTIPATH_HASH_FIELD_DST_PORT BIT(5)
483#define FIB_MULTIPATH_HASH_FIELD_INNER_SRC_IP BIT(6)
484#define FIB_MULTIPATH_HASH_FIELD_INNER_DST_IP BIT(7)
485#define FIB_MULTIPATH_HASH_FIELD_INNER_IP_PROTO BIT(8)
486#define FIB_MULTIPATH_HASH_FIELD_INNER_FLOWLABEL BIT(9)
487#define FIB_MULTIPATH_HASH_FIELD_INNER_SRC_PORT BIT(10)
488#define FIB_MULTIPATH_HASH_FIELD_INNER_DST_PORT BIT(11)
489
490#define FIB_MULTIPATH_HASH_FIELD_OUTER_MASK \
491 (FIB_MULTIPATH_HASH_FIELD_SRC_IP | \
492 FIB_MULTIPATH_HASH_FIELD_DST_IP | \
493 FIB_MULTIPATH_HASH_FIELD_IP_PROTO | \
494 FIB_MULTIPATH_HASH_FIELD_FLOWLABEL | \
495 FIB_MULTIPATH_HASH_FIELD_SRC_PORT | \
496 FIB_MULTIPATH_HASH_FIELD_DST_PORT)
497
498#define FIB_MULTIPATH_HASH_FIELD_INNER_MASK \
499 (FIB_MULTIPATH_HASH_FIELD_INNER_SRC_IP | \
500 FIB_MULTIPATH_HASH_FIELD_INNER_DST_IP | \
501 FIB_MULTIPATH_HASH_FIELD_INNER_IP_PROTO | \
502 FIB_MULTIPATH_HASH_FIELD_INNER_FLOWLABEL | \
503 FIB_MULTIPATH_HASH_FIELD_INNER_SRC_PORT | \
504 FIB_MULTIPATH_HASH_FIELD_INNER_DST_PORT)
505
506#define FIB_MULTIPATH_HASH_FIELD_ALL_MASK \
507 (FIB_MULTIPATH_HASH_FIELD_OUTER_MASK | \
508 FIB_MULTIPATH_HASH_FIELD_INNER_MASK)
509
510#define FIB_MULTIPATH_HASH_FIELD_DEFAULT_MASK \
511 (FIB_MULTIPATH_HASH_FIELD_SRC_IP | \
512 FIB_MULTIPATH_HASH_FIELD_DST_IP | \
513 FIB_MULTIPATH_HASH_FIELD_IP_PROTO)
514
515#ifdef CONFIG_IP_ROUTE_MULTIPATH
516int fib_multipath_hash(const struct net *net, const struct flowi4 *fl4,
517 const struct sk_buff *skb, struct flow_keys *flkeys);
518#endif
519int fib_check_nh(struct net *net, struct fib_nh *nh, u32 table, u8 scope,
520 struct netlink_ext_ack *extack);
521void fib_select_multipath(struct fib_result *res, int hash);
522void fib_select_path(struct net *net, struct fib_result *res,
523 struct flowi4 *fl4, const struct sk_buff *skb);
524
525int fib_nh_init(struct net *net, struct fib_nh *fib_nh,
526 struct fib_config *cfg, int nh_weight,
527 struct netlink_ext_ack *extack);
528void fib_nh_release(struct net *net, struct fib_nh *fib_nh);
529int fib_nh_common_init(struct net *net, struct fib_nh_common *nhc,
530 struct nlattr *fc_encap, u16 fc_encap_type,
531 void *cfg, gfp_t gfp_flags,
532 struct netlink_ext_ack *extack);
533void fib_nh_common_release(struct fib_nh_common *nhc);
534
535/* Exported by fib_trie.c */
536void fib_alias_hw_flags_set(struct net *net, const struct fib_rt_info *fri);
537void fib_trie_init(void);
538struct fib_table *fib_trie_table(u32 id, struct fib_table *alias);
539bool fib_lookup_good_nhc(const struct fib_nh_common *nhc, int fib_flags,
540 const struct flowi4 *flp);
541
542static inline void fib_combine_itag(u32 *itag, const struct fib_result *res)
543{
544#ifdef CONFIG_IP_ROUTE_CLASSID
545 struct fib_nh_common *nhc = res->nhc;
546#ifdef CONFIG_IP_MULTIPLE_TABLES
547 u32 rtag;
548#endif
549 if (nhc->nhc_family == AF_INET) {
550 struct fib_nh *nh;
551
552 nh = container_of(nhc, struct fib_nh, nh_common);
553 *itag = nh->nh_tclassid << 16;
554 } else {
555 *itag = 0;
556 }
557
558#ifdef CONFIG_IP_MULTIPLE_TABLES
559 rtag = res->tclassid;
560 if (*itag == 0)
561 *itag = (rtag<<16);
562 *itag |= (rtag>>16);
563#endif
564#endif
565}
566
567void fib_flush(struct net *net);
568void free_fib_info(struct fib_info *fi);
569
570static inline void fib_info_hold(struct fib_info *fi)
571{
572 refcount_inc(&fi->fib_clntref);
573}
574
575static inline void fib_info_put(struct fib_info *fi)
576{
577 if (refcount_dec_and_test(&fi->fib_clntref))
578 free_fib_info(fi);
579}
580
581#ifdef CONFIG_PROC_FS
582int __net_init fib_proc_init(struct net *net);
583void __net_exit fib_proc_exit(struct net *net);
584#else
585static inline int fib_proc_init(struct net *net)
586{
587 return 0;
588}
589static inline void fib_proc_exit(struct net *net)
590{
591}
592#endif
593
594u32 ip_mtu_from_fib_result(struct fib_result *res, __be32 daddr);
595
596int ip_valid_fib_dump_req(struct net *net, const struct nlmsghdr *nlh,
597 struct fib_dump_filter *filter,
598 struct netlink_callback *cb);
599
600int fib_nexthop_info(struct sk_buff *skb, const struct fib_nh_common *nh,
601 u8 rt_family, unsigned char *flags, bool skip_oif);
602int fib_add_nexthop(struct sk_buff *skb, const struct fib_nh_common *nh,
603 int nh_weight, u8 rt_family, u32 nh_tclassid);
604#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
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 };
48
49struct fib_info;
50struct rtable;
51
52struct fib_nh_exception {
53 struct fib_nh_exception __rcu *fnhe_next;
54 int fnhe_genid;
55 __be32 fnhe_daddr;
56 u32 fnhe_pmtu;
57 __be32 fnhe_gw;
58 unsigned long fnhe_expires;
59 struct rtable __rcu *fnhe_rth_input;
60 struct rtable __rcu *fnhe_rth_output;
61 unsigned long fnhe_stamp;
62};
63
64struct fnhe_hash_bucket {
65 struct fib_nh_exception __rcu *chain;
66};
67
68#define FNHE_HASH_SIZE 2048
69#define FNHE_RECLAIM_DEPTH 5
70
71struct fib_nh {
72 struct net_device *nh_dev;
73 struct hlist_node nh_hash;
74 struct fib_info *nh_parent;
75 unsigned int nh_flags;
76 unsigned char nh_scope;
77#ifdef CONFIG_IP_ROUTE_MULTIPATH
78 int nh_weight;
79 int nh_power;
80#endif
81#ifdef CONFIG_IP_ROUTE_CLASSID
82 __u32 nh_tclassid;
83#endif
84 int nh_oif;
85 __be32 nh_gw;
86 __be32 nh_saddr;
87 int nh_saddr_genid;
88 struct rtable __rcu * __percpu *nh_pcpu_rth_output;
89 struct rtable __rcu *nh_rth_input;
90 struct fnhe_hash_bucket *nh_exceptions;
91};
92
93/*
94 * This structure contains data shared by many of routes.
95 */
96
97struct fib_info {
98 struct hlist_node fib_hash;
99 struct hlist_node fib_lhash;
100 struct net *fib_net;
101 int fib_treeref;
102 atomic_t fib_clntref;
103 unsigned int fib_flags;
104 unsigned char fib_dead;
105 unsigned char fib_protocol;
106 unsigned char fib_scope;
107 unsigned char fib_type;
108 __be32 fib_prefsrc;
109 u32 fib_priority;
110 u32 *fib_metrics;
111#define fib_mtu fib_metrics[RTAX_MTU-1]
112#define fib_window fib_metrics[RTAX_WINDOW-1]
113#define fib_rtt fib_metrics[RTAX_RTT-1]
114#define fib_advmss fib_metrics[RTAX_ADVMSS-1]
115 int fib_nhs;
116#ifdef CONFIG_IP_ROUTE_MULTIPATH
117 int fib_power;
118#endif
119 struct rcu_head rcu;
120 struct fib_nh fib_nh[0];
121#define fib_dev fib_nh[0].nh_dev
122};
123
124
125#ifdef CONFIG_IP_MULTIPLE_TABLES
126struct fib_rule;
127#endif
128
129struct fib_table;
130struct fib_result {
131 unsigned char prefixlen;
132 unsigned char nh_sel;
133 unsigned char type;
134 unsigned char scope;
135 u32 tclassid;
136 struct fib_info *fi;
137 struct fib_table *table;
138 struct list_head *fa_head;
139};
140
141struct fib_result_nl {
142 __be32 fl_addr; /* To be looked up*/
143 u32 fl_mark;
144 unsigned char fl_tos;
145 unsigned char fl_scope;
146 unsigned char tb_id_in;
147
148 unsigned char tb_id; /* Results */
149 unsigned char prefixlen;
150 unsigned char nh_sel;
151 unsigned char type;
152 unsigned char scope;
153 int err;
154};
155
156#ifdef CONFIG_IP_ROUTE_MULTIPATH
157#define FIB_RES_NH(res) ((res).fi->fib_nh[(res).nh_sel])
158#else /* CONFIG_IP_ROUTE_MULTIPATH */
159#define FIB_RES_NH(res) ((res).fi->fib_nh[0])
160#endif /* CONFIG_IP_ROUTE_MULTIPATH */
161
162#ifdef CONFIG_IP_MULTIPLE_TABLES
163#define FIB_TABLE_HASHSZ 256
164#else
165#define FIB_TABLE_HASHSZ 2
166#endif
167
168__be32 fib_info_update_nh_saddr(struct net *net, struct fib_nh *nh);
169
170#define FIB_RES_SADDR(net, res) \
171 ((FIB_RES_NH(res).nh_saddr_genid == \
172 atomic_read(&(net)->ipv4.dev_addr_genid)) ? \
173 FIB_RES_NH(res).nh_saddr : \
174 fib_info_update_nh_saddr((net), &FIB_RES_NH(res)))
175#define FIB_RES_GW(res) (FIB_RES_NH(res).nh_gw)
176#define FIB_RES_DEV(res) (FIB_RES_NH(res).nh_dev)
177#define FIB_RES_OIF(res) (FIB_RES_NH(res).nh_oif)
178
179#define FIB_RES_PREFSRC(net, res) ((res).fi->fib_prefsrc ? : \
180 FIB_RES_SADDR(net, res))
181
182struct fib_table {
183 struct hlist_node tb_hlist;
184 u32 tb_id;
185 int tb_default;
186 int tb_num_default;
187 unsigned long tb_data[0];
188};
189
190int fib_table_lookup(struct fib_table *tb, const struct flowi4 *flp,
191 struct fib_result *res, int fib_flags);
192int fib_table_insert(struct fib_table *, struct fib_config *);
193int fib_table_delete(struct fib_table *, struct fib_config *);
194int fib_table_dump(struct fib_table *table, struct sk_buff *skb,
195 struct netlink_callback *cb);
196int fib_table_flush(struct fib_table *table);
197void fib_free_table(struct fib_table *tb);
198
199
200
201#ifndef CONFIG_IP_MULTIPLE_TABLES
202
203#define TABLE_LOCAL_INDEX 0
204#define TABLE_MAIN_INDEX 1
205
206static inline struct fib_table *fib_get_table(struct net *net, u32 id)
207{
208 struct hlist_head *ptr;
209
210 ptr = id == RT_TABLE_LOCAL ?
211 &net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX] :
212 &net->ipv4.fib_table_hash[TABLE_MAIN_INDEX];
213 return hlist_entry(ptr->first, struct fib_table, tb_hlist);
214}
215
216static inline struct fib_table *fib_new_table(struct net *net, u32 id)
217{
218 return fib_get_table(net, id);
219}
220
221static inline int fib_lookup(struct net *net, const struct flowi4 *flp,
222 struct fib_result *res)
223{
224 struct fib_table *table;
225
226 table = fib_get_table(net, RT_TABLE_LOCAL);
227 if (!fib_table_lookup(table, flp, res, FIB_LOOKUP_NOREF))
228 return 0;
229
230 table = fib_get_table(net, RT_TABLE_MAIN);
231 if (!fib_table_lookup(table, flp, res, FIB_LOOKUP_NOREF))
232 return 0;
233 return -ENETUNREACH;
234}
235
236#else /* CONFIG_IP_MULTIPLE_TABLES */
237int __net_init fib4_rules_init(struct net *net);
238void __net_exit fib4_rules_exit(struct net *net);
239
240struct fib_table *fib_new_table(struct net *net, u32 id);
241struct fib_table *fib_get_table(struct net *net, u32 id);
242
243int __fib_lookup(struct net *net, struct flowi4 *flp, struct fib_result *res);
244
245static inline int fib_lookup(struct net *net, struct flowi4 *flp,
246 struct fib_result *res)
247{
248 if (!net->ipv4.fib_has_custom_rules) {
249 res->tclassid = 0;
250 if (net->ipv4.fib_local &&
251 !fib_table_lookup(net->ipv4.fib_local, flp, res,
252 FIB_LOOKUP_NOREF))
253 return 0;
254 if (net->ipv4.fib_main &&
255 !fib_table_lookup(net->ipv4.fib_main, flp, res,
256 FIB_LOOKUP_NOREF))
257 return 0;
258 if (net->ipv4.fib_default &&
259 !fib_table_lookup(net->ipv4.fib_default, flp, res,
260 FIB_LOOKUP_NOREF))
261 return 0;
262 return -ENETUNREACH;
263 }
264 return __fib_lookup(net, flp, res);
265}
266
267#endif /* CONFIG_IP_MULTIPLE_TABLES */
268
269/* Exported by fib_frontend.c */
270extern const struct nla_policy rtm_ipv4_policy[];
271void ip_fib_init(void);
272__be32 fib_compute_spec_dst(struct sk_buff *skb);
273int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst,
274 u8 tos, int oif, struct net_device *dev,
275 struct in_device *idev, u32 *itag);
276void fib_select_default(struct fib_result *res);
277#ifdef CONFIG_IP_ROUTE_CLASSID
278static inline int fib_num_tclassid_users(struct net *net)
279{
280 return net->ipv4.fib_num_tclassid_users;
281}
282#else
283static inline int fib_num_tclassid_users(struct net *net)
284{
285 return 0;
286}
287#endif
288
289/* Exported by fib_semantics.c */
290int ip_fib_check_default(__be32 gw, struct net_device *dev);
291int fib_sync_down_dev(struct net_device *dev, int force);
292int fib_sync_down_addr(struct net *net, __be32 local);
293int fib_sync_up(struct net_device *dev);
294void fib_select_multipath(struct fib_result *res);
295
296/* Exported by fib_trie.c */
297void fib_trie_init(void);
298struct fib_table *fib_trie_table(u32 id);
299
300static inline void fib_combine_itag(u32 *itag, const struct fib_result *res)
301{
302#ifdef CONFIG_IP_ROUTE_CLASSID
303#ifdef CONFIG_IP_MULTIPLE_TABLES
304 u32 rtag;
305#endif
306 *itag = FIB_RES_NH(*res).nh_tclassid<<16;
307#ifdef CONFIG_IP_MULTIPLE_TABLES
308 rtag = res->tclassid;
309 if (*itag == 0)
310 *itag = (rtag<<16);
311 *itag |= (rtag>>16);
312#endif
313#endif
314}
315
316void free_fib_info(struct fib_info *fi);
317
318static inline void fib_info_put(struct fib_info *fi)
319{
320 if (atomic_dec_and_test(&fi->fib_clntref))
321 free_fib_info(fi);
322}
323
324#ifdef CONFIG_PROC_FS
325int __net_init fib_proc_init(struct net *net);
326void __net_exit fib_proc_exit(struct net *net);
327#else
328static inline int fib_proc_init(struct net *net)
329{
330 return 0;
331}
332static inline void fib_proc_exit(struct net *net)
333{
334}
335#endif
336
337#endif /* _NET_FIB_H */