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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
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 netdevice_tracker nhc_dev_tracker;
83 int nhc_oif;
84 unsigned char nhc_scope;
85 u8 nhc_family;
86 u8 nhc_gw_family;
87 unsigned char nhc_flags;
88 struct lwtunnel_state *nhc_lwtstate;
89
90 union {
91 __be32 ipv4;
92 struct in6_addr ipv6;
93 } nhc_gw;
94
95 int nhc_weight;
96 atomic_t nhc_upper_bound;
97
98
99 struct rtable __rcu * __percpu *nhc_pcpu_rth_output;
100 struct rtable __rcu *nhc_rth_input;
101 struct fnhe_hash_bucket __rcu *nhc_exceptions;
102};
103
104struct fib_nh {
105 struct fib_nh_common nh_common;
106 struct hlist_node nh_hash;
107 struct fib_info *nh_parent;
108#ifdef CONFIG_IP_ROUTE_CLASSID
109 __u32 nh_tclassid;
110#endif
111 __be32 nh_saddr;
112 int nh_saddr_genid;
113#define fib_nh_family nh_common.nhc_family
114#define fib_nh_dev nh_common.nhc_dev
115#define fib_nh_dev_tracker nh_common.nhc_dev_tracker
116#define fib_nh_oif nh_common.nhc_oif
117#define fib_nh_flags nh_common.nhc_flags
118#define fib_nh_lws nh_common.nhc_lwtstate
119#define fib_nh_scope nh_common.nhc_scope
120#define fib_nh_gw_family nh_common.nhc_gw_family
121#define fib_nh_gw4 nh_common.nhc_gw.ipv4
122#define fib_nh_gw6 nh_common.nhc_gw.ipv6
123#define fib_nh_weight nh_common.nhc_weight
124#define fib_nh_upper_bound nh_common.nhc_upper_bound
125};
126
127
128
129
130
131struct nexthop;
132
133struct fib_info {
134 struct hlist_node fib_hash;
135 struct hlist_node fib_lhash;
136 struct list_head nh_list;
137 struct net *fib_net;
138 refcount_t fib_treeref;
139 refcount_t fib_clntref;
140 unsigned int fib_flags;
141 unsigned char fib_dead;
142 unsigned char fib_protocol;
143 unsigned char fib_scope;
144 unsigned char fib_type;
145 __be32 fib_prefsrc;
146 u32 fib_tb_id;
147 u32 fib_priority;
148 struct dst_metrics *fib_metrics;
149#define fib_mtu fib_metrics->metrics[RTAX_MTU-1]
150#define fib_window fib_metrics->metrics[RTAX_WINDOW-1]
151#define fib_rtt fib_metrics->metrics[RTAX_RTT-1]
152#define fib_advmss fib_metrics->metrics[RTAX_ADVMSS-1]
153 int fib_nhs;
154 bool fib_nh_is_v6;
155 bool nh_updated;
156 struct nexthop *nh;
157 struct rcu_head rcu;
158 struct fib_nh fib_nh[];
159};
160
161
162#ifdef CONFIG_IP_MULTIPLE_TABLES
163struct fib_rule;
164#endif
165
166struct fib_table;
167struct fib_result {
168 __be32 prefix;
169 unsigned char prefixlen;
170 unsigned char nh_sel;
171 unsigned char type;
172 unsigned char scope;
173 u32 tclassid;
174 struct fib_nh_common *nhc;
175 struct fib_info *fi;
176 struct fib_table *table;
177 struct hlist_head *fa_head;
178};
179
180struct fib_result_nl {
181 __be32 fl_addr;
182 u32 fl_mark;
183 unsigned char fl_tos;
184 unsigned char fl_scope;
185 unsigned char tb_id_in;
186
187 unsigned char tb_id;
188 unsigned char prefixlen;
189 unsigned char nh_sel;
190 unsigned char type;
191 unsigned char scope;
192 int err;
193};
194
195#ifdef CONFIG_IP_MULTIPLE_TABLES
196#define FIB_TABLE_HASHSZ 256
197#else
198#define FIB_TABLE_HASHSZ 2
199#endif
200
201__be32 fib_info_update_nhc_saddr(struct net *net, struct fib_nh_common *nhc,
202 unsigned char scope);
203__be32 fib_result_prefsrc(struct net *net, struct fib_result *res);
204
205#define FIB_RES_NHC(res) ((res).nhc)
206#define FIB_RES_DEV(res) (FIB_RES_NHC(res)->nhc_dev)
207#define FIB_RES_OIF(res) (FIB_RES_NHC(res)->nhc_oif)
208
209struct fib_rt_info {
210 struct fib_info *fi;
211 u32 tb_id;
212 __be32 dst;
213 int dst_len;
214 u8 tos;
215 u8 type;
216 u8 offload:1,
217 trap:1,
218 offload_failed:1,
219 unused:5;
220};
221
222struct fib_entry_notifier_info {
223 struct fib_notifier_info info;
224 u32 dst;
225 int dst_len;
226 struct fib_info *fi;
227 u8 tos;
228 u8 type;
229 u32 tb_id;
230};
231
232struct fib_nh_notifier_info {
233 struct fib_notifier_info info;
234 struct fib_nh *fib_nh;
235};
236
237int call_fib4_notifier(struct notifier_block *nb,
238 enum fib_event_type event_type,
239 struct fib_notifier_info *info);
240int call_fib4_notifiers(struct net *net, enum fib_event_type event_type,
241 struct fib_notifier_info *info);
242
243int __net_init fib4_notifier_init(struct net *net);
244void __net_exit fib4_notifier_exit(struct net *net);
245
246void fib_info_notify_update(struct net *net, struct nl_info *info);
247int fib_notify(struct net *net, struct notifier_block *nb,
248 struct netlink_ext_ack *extack);
249
250struct fib_table {
251 struct hlist_node tb_hlist;
252 u32 tb_id;
253 int tb_num_default;
254 struct rcu_head rcu;
255 unsigned long *tb_data;
256 unsigned long __data[];
257};
258
259struct fib_dump_filter {
260 u32 table_id;
261
262 bool filter_set;
263 bool dump_routes;
264 bool dump_exceptions;
265 unsigned char protocol;
266 unsigned char rt_type;
267 unsigned int flags;
268 struct net_device *dev;
269};
270
271int fib_table_lookup(struct fib_table *tb, const struct flowi4 *flp,
272 struct fib_result *res, int fib_flags);
273int fib_table_insert(struct net *, struct fib_table *, struct fib_config *,
274 struct netlink_ext_ack *extack);
275int fib_table_delete(struct net *, struct fib_table *, struct fib_config *,
276 struct netlink_ext_ack *extack);
277int fib_table_dump(struct fib_table *table, struct sk_buff *skb,
278 struct netlink_callback *cb, struct fib_dump_filter *filter);
279int fib_table_flush(struct net *net, struct fib_table *table, bool flush_all);
280struct fib_table *fib_trie_unmerge(struct fib_table *main_tb);
281void fib_table_flush_external(struct fib_table *table);
282void fib_free_table(struct fib_table *tb);
283
284#ifndef CONFIG_IP_MULTIPLE_TABLES
285
286#define TABLE_LOCAL_INDEX (RT_TABLE_LOCAL & (FIB_TABLE_HASHSZ - 1))
287#define TABLE_MAIN_INDEX (RT_TABLE_MAIN & (FIB_TABLE_HASHSZ - 1))
288
289static inline struct fib_table *fib_get_table(struct net *net, u32 id)
290{
291 struct hlist_node *tb_hlist;
292 struct hlist_head *ptr;
293
294 ptr = id == RT_TABLE_LOCAL ?
295 &net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX] :
296 &net->ipv4.fib_table_hash[TABLE_MAIN_INDEX];
297
298 tb_hlist = rcu_dereference_rtnl(hlist_first_rcu(ptr));
299
300 return hlist_entry(tb_hlist, struct fib_table, tb_hlist);
301}
302
303static inline struct fib_table *fib_new_table(struct net *net, u32 id)
304{
305 return fib_get_table(net, id);
306}
307
308static inline int fib_lookup(struct net *net, const struct flowi4 *flp,
309 struct fib_result *res, unsigned int flags)
310{
311 struct fib_table *tb;
312 int err = -ENETUNREACH;
313
314 rcu_read_lock();
315
316 tb = fib_get_table(net, RT_TABLE_MAIN);
317 if (tb)
318 err = fib_table_lookup(tb, flp, res, flags | FIB_LOOKUP_NOREF);
319
320 if (err == -EAGAIN)
321 err = -ENETUNREACH;
322
323 rcu_read_unlock();
324
325 return err;
326}
327
328static inline bool fib4_has_custom_rules(const struct net *net)
329{
330 return false;
331}
332
333static inline bool fib4_rule_default(const struct fib_rule *rule)
334{
335 return true;
336}
337
338static inline int fib4_rules_dump(struct net *net, struct notifier_block *nb,
339 struct netlink_ext_ack *extack)
340{
341 return 0;
342}
343
344static inline unsigned int fib4_rules_seq_read(struct net *net)
345{
346 return 0;
347}
348
349static inline bool fib4_rules_early_flow_dissect(struct net *net,
350 struct sk_buff *skb,
351 struct flowi4 *fl4,
352 struct flow_keys *flkeys)
353{
354 return false;
355}
356#else
357int __net_init fib4_rules_init(struct net *net);
358void __net_exit fib4_rules_exit(struct net *net);
359
360struct fib_table *fib_new_table(struct net *net, u32 id);
361struct fib_table *fib_get_table(struct net *net, u32 id);
362
363int __fib_lookup(struct net *net, struct flowi4 *flp,
364 struct fib_result *res, unsigned int flags);
365
366static inline int fib_lookup(struct net *net, struct flowi4 *flp,
367 struct fib_result *res, unsigned int flags)
368{
369 struct fib_table *tb;
370 int err = -ENETUNREACH;
371
372 flags |= FIB_LOOKUP_NOREF;
373 if (net->ipv4.fib_has_custom_rules)
374 return __fib_lookup(net, flp, res, flags);
375
376 rcu_read_lock();
377
378 res->tclassid = 0;
379
380 tb = rcu_dereference_rtnl(net->ipv4.fib_main);
381 if (tb)
382 err = fib_table_lookup(tb, flp, res, flags);
383
384 if (!err)
385 goto out;
386
387 tb = rcu_dereference_rtnl(net->ipv4.fib_default);
388 if (tb)
389 err = fib_table_lookup(tb, flp, res, flags);
390
391out:
392 if (err == -EAGAIN)
393 err = -ENETUNREACH;
394
395 rcu_read_unlock();
396
397 return err;
398}
399
400static inline bool fib4_has_custom_rules(const struct net *net)
401{
402 return net->ipv4.fib_has_custom_rules;
403}
404
405bool fib4_rule_default(const struct fib_rule *rule);
406int fib4_rules_dump(struct net *net, struct notifier_block *nb,
407 struct netlink_ext_ack *extack);
408unsigned int fib4_rules_seq_read(struct net *net);
409
410static inline bool fib4_rules_early_flow_dissect(struct net *net,
411 struct sk_buff *skb,
412 struct flowi4 *fl4,
413 struct flow_keys *flkeys)
414{
415 unsigned int flag = FLOW_DISSECTOR_F_STOP_AT_ENCAP;
416
417 if (!net->ipv4.fib_rules_require_fldissect)
418 return false;
419
420 skb_flow_dissect_flow_keys(skb, flkeys, flag);
421 fl4->fl4_sport = flkeys->ports.src;
422 fl4->fl4_dport = flkeys->ports.dst;
423 fl4->flowi4_proto = flkeys->basic.ip_proto;
424
425 return true;
426}
427
428#endif
429
430
431extern const struct nla_policy rtm_ipv4_policy[];
432void ip_fib_init(void);
433int fib_gw_from_via(struct fib_config *cfg, struct nlattr *nla,
434 struct netlink_ext_ack *extack);
435__be32 fib_compute_spec_dst(struct sk_buff *skb);
436bool fib_info_nh_uses_dev(struct fib_info *fi, const struct net_device *dev);
437int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst,
438 u8 tos, int oif, struct net_device *dev,
439 struct in_device *idev, u32 *itag);
440#ifdef CONFIG_IP_ROUTE_CLASSID
441static inline int fib_num_tclassid_users(struct net *net)
442{
443 return atomic_read(&net->ipv4.fib_num_tclassid_users);
444}
445#else
446static inline int fib_num_tclassid_users(struct net *net)
447{
448 return 0;
449}
450#endif
451int fib_unmerge(struct net *net);
452
453static inline bool nhc_l3mdev_matches_dev(const struct fib_nh_common *nhc,
454const struct net_device *dev)
455{
456 if (nhc->nhc_dev == dev ||
457 l3mdev_master_ifindex_rcu(nhc->nhc_dev) == dev->ifindex)
458 return true;
459
460 return false;
461}
462
463
464int ip_fib_check_default(__be32 gw, struct net_device *dev);
465int fib_sync_down_dev(struct net_device *dev, unsigned long event, bool force);
466int fib_sync_down_addr(struct net_device *dev, __be32 local);
467int fib_sync_up(struct net_device *dev, unsigned char nh_flags);
468void fib_sync_mtu(struct net_device *dev, u32 orig_mtu);
469void fib_nhc_update_mtu(struct fib_nh_common *nhc, u32 new, u32 orig);
470
471
472
473
474
475
476#define FIB_MULTIPATH_HASH_FIELD_SRC_IP BIT(0)
477#define FIB_MULTIPATH_HASH_FIELD_DST_IP BIT(1)
478#define FIB_MULTIPATH_HASH_FIELD_IP_PROTO BIT(2)
479#define FIB_MULTIPATH_HASH_FIELD_FLOWLABEL BIT(3)
480#define FIB_MULTIPATH_HASH_FIELD_SRC_PORT BIT(4)
481#define FIB_MULTIPATH_HASH_FIELD_DST_PORT BIT(5)
482#define FIB_MULTIPATH_HASH_FIELD_INNER_SRC_IP BIT(6)
483#define FIB_MULTIPATH_HASH_FIELD_INNER_DST_IP BIT(7)
484#define FIB_MULTIPATH_HASH_FIELD_INNER_IP_PROTO BIT(8)
485#define FIB_MULTIPATH_HASH_FIELD_INNER_FLOWLABEL BIT(9)
486#define FIB_MULTIPATH_HASH_FIELD_INNER_SRC_PORT BIT(10)
487#define FIB_MULTIPATH_HASH_FIELD_INNER_DST_PORT BIT(11)
488
489#define FIB_MULTIPATH_HASH_FIELD_OUTER_MASK \
490 (FIB_MULTIPATH_HASH_FIELD_SRC_IP | \
491 FIB_MULTIPATH_HASH_FIELD_DST_IP | \
492 FIB_MULTIPATH_HASH_FIELD_IP_PROTO | \
493 FIB_MULTIPATH_HASH_FIELD_FLOWLABEL | \
494 FIB_MULTIPATH_HASH_FIELD_SRC_PORT | \
495 FIB_MULTIPATH_HASH_FIELD_DST_PORT)
496
497#define FIB_MULTIPATH_HASH_FIELD_INNER_MASK \
498 (FIB_MULTIPATH_HASH_FIELD_INNER_SRC_IP | \
499 FIB_MULTIPATH_HASH_FIELD_INNER_DST_IP | \
500 FIB_MULTIPATH_HASH_FIELD_INNER_IP_PROTO | \
501 FIB_MULTIPATH_HASH_FIELD_INNER_FLOWLABEL | \
502 FIB_MULTIPATH_HASH_FIELD_INNER_SRC_PORT | \
503 FIB_MULTIPATH_HASH_FIELD_INNER_DST_PORT)
504
505#define FIB_MULTIPATH_HASH_FIELD_ALL_MASK \
506 (FIB_MULTIPATH_HASH_FIELD_OUTER_MASK | \
507 FIB_MULTIPATH_HASH_FIELD_INNER_MASK)
508
509#define FIB_MULTIPATH_HASH_FIELD_DEFAULT_MASK \
510 (FIB_MULTIPATH_HASH_FIELD_SRC_IP | \
511 FIB_MULTIPATH_HASH_FIELD_DST_IP | \
512 FIB_MULTIPATH_HASH_FIELD_IP_PROTO)
513
514#ifdef CONFIG_IP_ROUTE_MULTIPATH
515int fib_multipath_hash(const struct net *net, const struct flowi4 *fl4,
516 const struct sk_buff *skb, struct flow_keys *flkeys);
517#endif
518int fib_check_nh(struct net *net, struct fib_nh *nh, u32 table, u8 scope,
519 struct netlink_ext_ack *extack);
520void fib_select_multipath(struct fib_result *res, int hash);
521void fib_select_path(struct net *net, struct fib_result *res,
522 struct flowi4 *fl4, const struct sk_buff *skb);
523
524int fib_nh_init(struct net *net, struct fib_nh *fib_nh,
525 struct fib_config *cfg, int nh_weight,
526 struct netlink_ext_ack *extack);
527void fib_nh_release(struct net *net, struct fib_nh *fib_nh);
528int fib_nh_common_init(struct net *net, struct fib_nh_common *nhc,
529 struct nlattr *fc_encap, u16 fc_encap_type,
530 void *cfg, gfp_t gfp_flags,
531 struct netlink_ext_ack *extack);
532void fib_nh_common_release(struct fib_nh_common *nhc);
533
534
535void fib_alias_hw_flags_set(struct net *net, const struct fib_rt_info *fri);
536void fib_trie_init(void);
537struct fib_table *fib_trie_table(u32 id, struct fib_table *alias);
538bool fib_lookup_good_nhc(const struct fib_nh_common *nhc, int fib_flags,
539 const struct flowi4 *flp);
540
541static inline void fib_combine_itag(u32 *itag, const struct fib_result *res)
542{
543#ifdef CONFIG_IP_ROUTE_CLASSID
544 struct fib_nh_common *nhc = res->nhc;
545#ifdef CONFIG_IP_MULTIPLE_TABLES
546 u32 rtag;
547#endif
548 if (nhc->nhc_family == AF_INET) {
549 struct fib_nh *nh;
550
551 nh = container_of(nhc, struct fib_nh, nh_common);
552 *itag = nh->nh_tclassid << 16;
553 } else {
554 *itag = 0;
555 }
556
557#ifdef CONFIG_IP_MULTIPLE_TABLES
558 rtag = res->tclassid;
559 if (*itag == 0)
560 *itag = (rtag<<16);
561 *itag |= (rtag>>16);
562#endif
563#endif
564}
565
566void fib_flush(struct net *net);
567void free_fib_info(struct fib_info *fi);
568
569static inline void fib_info_hold(struct fib_info *fi)
570{
571 refcount_inc(&fi->fib_clntref);
572}
573
574static inline void fib_info_put(struct fib_info *fi)
575{
576 if (refcount_dec_and_test(&fi->fib_clntref))
577 free_fib_info(fi);
578}
579
580#ifdef CONFIG_PROC_FS
581int __net_init fib_proc_init(struct net *net);
582void __net_exit fib_proc_exit(struct net *net);
583#else
584static inline int fib_proc_init(struct net *net)
585{
586 return 0;
587}
588static inline void fib_proc_exit(struct net *net)
589{
590}
591#endif
592
593u32 ip_mtu_from_fib_result(struct fib_result *res, __be32 daddr);
594
595int ip_valid_fib_dump_req(struct net *net, const struct nlmsghdr *nlh,
596 struct fib_dump_filter *filter,
597 struct netlink_callback *cb);
598
599int fib_nexthop_info(struct sk_buff *skb, const struct fib_nh_common *nh,
600 u8 rt_family, unsigned char *flags, bool skip_oif);
601int fib_add_nexthop(struct sk_buff *skb, const struct fib_nh_common *nh,
602 int nh_weight, u8 rt_family, u32 nh_tclassid);
603#endif
604
