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Linux/include/net/ip_fib.h

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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/inetpeer.h>
 21 #include <linux/percpu.h>
 22 #include <linux/notifier.h>
 23 #include <linux/refcount.h>
 24 
 25 struct 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         /* 2 bytes unused */
 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 
 55 struct fib_info;
 56 struct rtable;
 57 
 58 struct 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 
 72 struct 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 
 80 struct fib_nh_common {
 81         struct net_device       *nhc_dev;
 82         int                     nhc_oif;
 83         unsigned char           nhc_scope;
 84         u8                      nhc_family;
 85         u8                      nhc_gw_family;
 86         unsigned char           nhc_flags;
 87         struct lwtunnel_state   *nhc_lwtstate;
 88 
 89         union {
 90                 __be32          ipv4;
 91                 struct in6_addr ipv6;
 92         } nhc_gw;
 93 
 94         int                     nhc_weight;
 95         atomic_t                nhc_upper_bound;
 96 
 97         /* v4 specific, but allows fib6_nh with v4 routes */
 98         struct rtable __rcu * __percpu *nhc_pcpu_rth_output;
 99         struct rtable __rcu     *nhc_rth_input;
100         struct fnhe_hash_bucket __rcu *nhc_exceptions;
101 };
102 
103 struct fib_nh {
104         struct fib_nh_common    nh_common;
105         struct hlist_node       nh_hash;
106         struct fib_info         *nh_parent;
107 #ifdef CONFIG_IP_ROUTE_CLASSID
108         __u32                   nh_tclassid;
109 #endif
110         __be32                  nh_saddr;
111         int                     nh_saddr_genid;
112 #define fib_nh_family           nh_common.nhc_family
113 #define fib_nh_dev              nh_common.nhc_dev
114 #define fib_nh_oif              nh_common.nhc_oif
115 #define fib_nh_flags            nh_common.nhc_flags
116 #define fib_nh_lws              nh_common.nhc_lwtstate
117 #define fib_nh_scope            nh_common.nhc_scope
118 #define fib_nh_gw_family        nh_common.nhc_gw_family
119 #define fib_nh_gw4              nh_common.nhc_gw.ipv4
120 #define fib_nh_gw6              nh_common.nhc_gw.ipv6
121 #define fib_nh_weight           nh_common.nhc_weight
122 #define fib_nh_upper_bound      nh_common.nhc_upper_bound
123 };
124 
125 /*
126  * This structure contains data shared by many of routes.
127  */
128 
129 struct nexthop;
130 
131 struct fib_info {
132         struct hlist_node       fib_hash;
133         struct hlist_node       fib_lhash;
134         struct list_head        nh_list;
135         struct net              *fib_net;
136         int                     fib_treeref;
137         refcount_t              fib_clntref;
138         unsigned int            fib_flags;
139         unsigned char           fib_dead;
140         unsigned char           fib_protocol;
141         unsigned char           fib_scope;
142         unsigned char           fib_type;
143         __be32                  fib_prefsrc;
144         u32                     fib_tb_id;
145         u32                     fib_priority;
146         struct dst_metrics      *fib_metrics;
147 #define fib_mtu fib_metrics->metrics[RTAX_MTU-1]
148 #define fib_window fib_metrics->metrics[RTAX_WINDOW-1]
149 #define fib_rtt fib_metrics->metrics[RTAX_RTT-1]
150 #define fib_advmss fib_metrics->metrics[RTAX_ADVMSS-1]
151         int                     fib_nhs;
152         bool                    fib_nh_is_v6;
153         bool                    nh_updated;
154         struct nexthop          *nh;
155         struct rcu_head         rcu;
156         struct fib_nh           fib_nh[0];
157 };
158 
159 
160 #ifdef CONFIG_IP_MULTIPLE_TABLES
161 struct fib_rule;
162 #endif
163 
164 struct fib_table;
165 struct fib_result {
166         __be32                  prefix;
167         unsigned char           prefixlen;
168         unsigned char           nh_sel;
169         unsigned char           type;
170         unsigned char           scope;
171         u32                     tclassid;
172         struct fib_nh_common    *nhc;
173         struct fib_info         *fi;
174         struct fib_table        *table;
175         struct hlist_head       *fa_head;
176 };
177 
178 struct fib_result_nl {
179         __be32          fl_addr;   /* To be looked up*/
180         u32             fl_mark;
181         unsigned char   fl_tos;
182         unsigned char   fl_scope;
183         unsigned char   tb_id_in;
184 
185         unsigned char   tb_id;      /* Results */
186         unsigned char   prefixlen;
187         unsigned char   nh_sel;
188         unsigned char   type;
189         unsigned char   scope;
190         int             err;
191 };
192 
193 #ifdef CONFIG_IP_MULTIPLE_TABLES
194 #define FIB_TABLE_HASHSZ 256
195 #else
196 #define FIB_TABLE_HASHSZ 2
197 #endif
198 
199 __be32 fib_info_update_nhc_saddr(struct net *net, struct fib_nh_common *nhc,
200                                  unsigned char scope);
201 __be32 fib_result_prefsrc(struct net *net, struct fib_result *res);
202 
203 #define FIB_RES_NHC(res)                ((res).nhc)
204 #define FIB_RES_DEV(res)        (FIB_RES_NHC(res)->nhc_dev)
205 #define FIB_RES_OIF(res)        (FIB_RES_NHC(res)->nhc_oif)
206 
207 struct fib_entry_notifier_info {
208         struct fib_notifier_info info; /* must be first */
209         u32 dst;
210         int dst_len;
211         struct fib_info *fi;
212         u8 tos;
213         u8 type;
214         u32 tb_id;
215 };
216 
217 struct fib_nh_notifier_info {
218         struct fib_notifier_info info; /* must be first */
219         struct fib_nh *fib_nh;
220 };
221 
222 int call_fib4_notifier(struct notifier_block *nb,
223                        enum fib_event_type event_type,
224                        struct fib_notifier_info *info);
225 int call_fib4_notifiers(struct net *net, enum fib_event_type event_type,
226                         struct fib_notifier_info *info);
227 
228 int __net_init fib4_notifier_init(struct net *net);
229 void __net_exit fib4_notifier_exit(struct net *net);
230 
231 void fib_info_notify_update(struct net *net, struct nl_info *info);
232 int fib_notify(struct net *net, struct notifier_block *nb,
233                struct netlink_ext_ack *extack);
234 
235 struct fib_table {
236         struct hlist_node       tb_hlist;
237         u32                     tb_id;
238         int                     tb_num_default;
239         struct rcu_head         rcu;
240         unsigned long           *tb_data;
241         unsigned long           __data[0];
242 };
243 
244 struct fib_dump_filter {
245         u32                     table_id;
246         /* filter_set is an optimization that an entry is set */
247         bool                    filter_set;
248         bool                    dump_all_families;
249         bool                    dump_routes;
250         bool                    dump_exceptions;
251         unsigned char           protocol;
252         unsigned char           rt_type;
253         unsigned int            flags;
254         struct net_device       *dev;
255 };
256 
257 int fib_table_lookup(struct fib_table *tb, const struct flowi4 *flp,
258                      struct fib_result *res, int fib_flags);
259 int fib_table_insert(struct net *, struct fib_table *, struct fib_config *,
260                      struct netlink_ext_ack *extack);
261 int fib_table_delete(struct net *, struct fib_table *, struct fib_config *,
262                      struct netlink_ext_ack *extack);
263 int fib_table_dump(struct fib_table *table, struct sk_buff *skb,
264                    struct netlink_callback *cb, struct fib_dump_filter *filter);
265 int fib_table_flush(struct net *net, struct fib_table *table, bool flush_all);
266 struct fib_table *fib_trie_unmerge(struct fib_table *main_tb);
267 void fib_table_flush_external(struct fib_table *table);
268 void fib_free_table(struct fib_table *tb);
269 
270 #ifndef CONFIG_IP_MULTIPLE_TABLES
271 
272 #define TABLE_LOCAL_INDEX       (RT_TABLE_LOCAL & (FIB_TABLE_HASHSZ - 1))
273 #define TABLE_MAIN_INDEX        (RT_TABLE_MAIN  & (FIB_TABLE_HASHSZ - 1))
274 
275 static inline struct fib_table *fib_get_table(struct net *net, u32 id)
276 {
277         struct hlist_node *tb_hlist;
278         struct hlist_head *ptr;
279 
280         ptr = id == RT_TABLE_LOCAL ?
281                 &net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX] :
282                 &net->ipv4.fib_table_hash[TABLE_MAIN_INDEX];
283 
284         tb_hlist = rcu_dereference_rtnl(hlist_first_rcu(ptr));
285 
286         return hlist_entry(tb_hlist, struct fib_table, tb_hlist);
287 }
288 
289 static inline struct fib_table *fib_new_table(struct net *net, u32 id)
290 {
291         return fib_get_table(net, id);
292 }
293 
294 static inline int fib_lookup(struct net *net, const struct flowi4 *flp,
295                              struct fib_result *res, unsigned int flags)
296 {
297         struct fib_table *tb;
298         int err = -ENETUNREACH;
299 
300         rcu_read_lock();
301 
302         tb = fib_get_table(net, RT_TABLE_MAIN);
303         if (tb)
304                 err = fib_table_lookup(tb, flp, res, flags | FIB_LOOKUP_NOREF);
305 
306         if (err == -EAGAIN)
307                 err = -ENETUNREACH;
308 
309         rcu_read_unlock();
310 
311         return err;
312 }
313 
314 static inline bool fib4_has_custom_rules(const struct net *net)
315 {
316         return false;
317 }
318 
319 static inline bool fib4_rule_default(const struct fib_rule *rule)
320 {
321         return true;
322 }
323 
324 static inline int fib4_rules_dump(struct net *net, struct notifier_block *nb,
325                                   struct netlink_ext_ack *extack)
326 {
327         return 0;
328 }
329 
330 static inline unsigned int fib4_rules_seq_read(struct net *net)
331 {
332         return 0;
333 }
334 
335 static inline bool fib4_rules_early_flow_dissect(struct net *net,
336                                                  struct sk_buff *skb,
337                                                  struct flowi4 *fl4,
338                                                  struct flow_keys *flkeys)
339 {
340         return false;
341 }
342 #else /* CONFIG_IP_MULTIPLE_TABLES */
343 int __net_init fib4_rules_init(struct net *net);
344 void __net_exit fib4_rules_exit(struct net *net);
345 
346 struct fib_table *fib_new_table(struct net *net, u32 id);
347 struct fib_table *fib_get_table(struct net *net, u32 id);
348 
349 int __fib_lookup(struct net *net, struct flowi4 *flp,
350                  struct fib_result *res, unsigned int flags);
351 
352 static inline int fib_lookup(struct net *net, struct flowi4 *flp,
353                              struct fib_result *res, unsigned int flags)
354 {
355         struct fib_table *tb;
356         int err = -ENETUNREACH;
357 
358         flags |= FIB_LOOKUP_NOREF;
359         if (net->ipv4.fib_has_custom_rules)
360                 return __fib_lookup(net, flp, res, flags);
361 
362         rcu_read_lock();
363 
364         res->tclassid = 0;
365 
366         tb = rcu_dereference_rtnl(net->ipv4.fib_main);
367         if (tb)
368                 err = fib_table_lookup(tb, flp, res, flags);
369 
370         if (!err)
371                 goto out;
372 
373         tb = rcu_dereference_rtnl(net->ipv4.fib_default);
374         if (tb)
375                 err = fib_table_lookup(tb, flp, res, flags);
376 
377 out:
378         if (err == -EAGAIN)
379                 err = -ENETUNREACH;
380 
381         rcu_read_unlock();
382 
383         return err;
384 }
385 
386 static inline bool fib4_has_custom_rules(const struct net *net)
387 {
388         return net->ipv4.fib_has_custom_rules;
389 }
390 
391 bool fib4_rule_default(const struct fib_rule *rule);
392 int fib4_rules_dump(struct net *net, struct notifier_block *nb,
393                     struct netlink_ext_ack *extack);
394 unsigned int fib4_rules_seq_read(struct net *net);
395 
396 static inline bool fib4_rules_early_flow_dissect(struct net *net,
397                                                  struct sk_buff *skb,
398                                                  struct flowi4 *fl4,
399                                                  struct flow_keys *flkeys)
400 {
401         unsigned int flag = FLOW_DISSECTOR_F_STOP_AT_ENCAP;
402 
403         if (!net->ipv4.fib_rules_require_fldissect)
404                 return false;
405 
406         skb_flow_dissect_flow_keys(skb, flkeys, flag);
407         fl4->fl4_sport = flkeys->ports.src;
408         fl4->fl4_dport = flkeys->ports.dst;
409         fl4->flowi4_proto = flkeys->basic.ip_proto;
410 
411         return true;
412 }
413 
414 #endif /* CONFIG_IP_MULTIPLE_TABLES */
415 
416 /* Exported by fib_frontend.c */
417 extern const struct nla_policy rtm_ipv4_policy[];
418 void ip_fib_init(void);
419 int fib_gw_from_via(struct fib_config *cfg, struct nlattr *nla,
420                     struct netlink_ext_ack *extack);
421 __be32 fib_compute_spec_dst(struct sk_buff *skb);
422 bool fib_info_nh_uses_dev(struct fib_info *fi, const struct net_device *dev);
423 int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst,
424                         u8 tos, int oif, struct net_device *dev,
425                         struct in_device *idev, u32 *itag);
426 #ifdef CONFIG_IP_ROUTE_CLASSID
427 static inline int fib_num_tclassid_users(struct net *net)
428 {
429         return net->ipv4.fib_num_tclassid_users;
430 }
431 #else
432 static inline int fib_num_tclassid_users(struct net *net)
433 {
434         return 0;
435 }
436 #endif
437 int fib_unmerge(struct net *net);
438 
439 /* Exported by fib_semantics.c */
440 int ip_fib_check_default(__be32 gw, struct net_device *dev);
441 int fib_sync_down_dev(struct net_device *dev, unsigned long event, bool force);
442 int fib_sync_down_addr(struct net_device *dev, __be32 local);
443 int fib_sync_up(struct net_device *dev, unsigned char nh_flags);
444 void fib_sync_mtu(struct net_device *dev, u32 orig_mtu);
445 void fib_nhc_update_mtu(struct fib_nh_common *nhc, u32 new, u32 orig);
446 
447 #ifdef CONFIG_IP_ROUTE_MULTIPATH
448 int fib_multipath_hash(const struct net *net, const struct flowi4 *fl4,
449                        const struct sk_buff *skb, struct flow_keys *flkeys);
450 #endif
451 int fib_check_nh(struct net *net, struct fib_nh *nh, u32 table, u8 scope,
452                  struct netlink_ext_ack *extack);
453 void fib_select_multipath(struct fib_result *res, int hash);
454 void fib_select_path(struct net *net, struct fib_result *res,
455                      struct flowi4 *fl4, const struct sk_buff *skb);
456 
457 int fib_nh_init(struct net *net, struct fib_nh *fib_nh,
458                 struct fib_config *cfg, int nh_weight,
459                 struct netlink_ext_ack *extack);
460 void fib_nh_release(struct net *net, struct fib_nh *fib_nh);
461 int fib_nh_common_init(struct fib_nh_common *nhc, struct nlattr *fc_encap,
462                        u16 fc_encap_type, void *cfg, gfp_t gfp_flags,
463                        struct netlink_ext_ack *extack);
464 void fib_nh_common_release(struct fib_nh_common *nhc);
465 
466 /* Exported by fib_trie.c */
467 void fib_trie_init(void);
468 struct fib_table *fib_trie_table(u32 id, struct fib_table *alias);
469 
470 static inline void fib_combine_itag(u32 *itag, const struct fib_result *res)
471 {
472 #ifdef CONFIG_IP_ROUTE_CLASSID
473         struct fib_nh_common *nhc = res->nhc;
474 #ifdef CONFIG_IP_MULTIPLE_TABLES
475         u32 rtag;
476 #endif
477         if (nhc->nhc_family == AF_INET) {
478                 struct fib_nh *nh;
479 
480                 nh = container_of(nhc, struct fib_nh, nh_common);
481                 *itag = nh->nh_tclassid << 16;
482         } else {
483                 *itag = 0;
484         }
485 
486 #ifdef CONFIG_IP_MULTIPLE_TABLES
487         rtag = res->tclassid;
488         if (*itag == 0)
489                 *itag = (rtag<<16);
490         *itag |= (rtag>>16);
491 #endif
492 #endif
493 }
494 
495 void fib_flush(struct net *net);
496 void free_fib_info(struct fib_info *fi);
497 
498 static inline void fib_info_hold(struct fib_info *fi)
499 {
500         refcount_inc(&fi->fib_clntref);
501 }
502 
503 static inline void fib_info_put(struct fib_info *fi)
504 {
505         if (refcount_dec_and_test(&fi->fib_clntref))
506                 free_fib_info(fi);
507 }
508 
509 #ifdef CONFIG_PROC_FS
510 int __net_init fib_proc_init(struct net *net);
511 void __net_exit fib_proc_exit(struct net *net);
512 #else
513 static inline int fib_proc_init(struct net *net)
514 {
515         return 0;
516 }
517 static inline void fib_proc_exit(struct net *net)
518 {
519 }
520 #endif
521 
522 u32 ip_mtu_from_fib_result(struct fib_result *res, __be32 daddr);
523 
524 int ip_valid_fib_dump_req(struct net *net, const struct nlmsghdr *nlh,
525                           struct fib_dump_filter *filter,
526                           struct netlink_callback *cb);
527 
528 int fib_nexthop_info(struct sk_buff *skb, const struct fib_nh_common *nh,
529                      u8 rt_family, unsigned char *flags, bool skip_oif);
530 int fib_add_nexthop(struct sk_buff *skb, const struct fib_nh_common *nh,
531                     int nh_weight, u8 rt_family);
532 #endif  /* _NET_FIB_H */
533 

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