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Linux/include/net/ip_fib.h

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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 
 29 struct 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 
 54 struct fib_info;
 55 struct rtable;
 56 
 57 struct 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 
 71 struct 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 
 79 struct 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 
106 struct 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
133 struct fib_rule;
134 #endif
135 
136 struct fib_table;
137 struct 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 
149 struct 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 
190 struct 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 
200 struct fib_nh_notifier_info {
201         struct fib_notifier_info info; /* must be first */
202         struct fib_nh *fib_nh;
203 };
204 
205 int call_fib4_notifier(struct notifier_block *nb, struct net *net,
206                        enum fib_event_type event_type,
207                        struct fib_notifier_info *info);
208 int call_fib4_notifiers(struct net *net, enum fib_event_type event_type,
209                         struct fib_notifier_info *info);
210 
211 int __net_init fib4_notifier_init(struct net *net);
212 void __net_exit fib4_notifier_exit(struct net *net);
213 
214 void fib_notify(struct net *net, struct notifier_block *nb);
215 
216 struct 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 
225 int fib_table_lookup(struct fib_table *tb, const struct flowi4 *flp,
226                      struct fib_result *res, int fib_flags);
227 int fib_table_insert(struct net *, struct fib_table *, struct fib_config *,
228                      struct netlink_ext_ack *extack);
229 int fib_table_delete(struct net *, struct fib_table *, struct fib_config *,
230                      struct netlink_ext_ack *extack);
231 int fib_table_dump(struct fib_table *table, struct sk_buff *skb,
232                    struct netlink_callback *cb);
233 int fib_table_flush(struct net *net, struct fib_table *table);
234 struct fib_table *fib_trie_unmerge(struct fib_table *main_tb);
235 void fib_table_flush_external(struct fib_table *table);
236 void 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 
243 static 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 
257 static inline struct fib_table *fib_new_table(struct net *net, u32 id)
258 {
259         return fib_get_table(net, id);
260 }
261 
262 static 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 
282 static inline bool fib4_rule_default(const struct fib_rule *rule)
283 {
284         return true;
285 }
286 
287 static inline int fib4_rules_dump(struct net *net, struct notifier_block *nb)
288 {
289         return 0;
290 }
291 
292 static inline unsigned int fib4_rules_seq_read(struct net *net)
293 {
294         return 0;
295 }
296 
297 static 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 */
305 int __net_init fib4_rules_init(struct net *net);
306 void __net_exit fib4_rules_exit(struct net *net);
307 
308 struct fib_table *fib_new_table(struct net *net, u32 id);
309 struct fib_table *fib_get_table(struct net *net, u32 id);
310 
311 int __fib_lookup(struct net *net, struct flowi4 *flp,
312                  struct fib_result *res, unsigned int flags);
313 
314 static 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 
339 out:
340         if (err == -EAGAIN)
341                 err = -ENETUNREACH;
342 
343         rcu_read_unlock();
344 
345         return err;
346 }
347 
348 bool fib4_rule_default(const struct fib_rule *rule);
349 int fib4_rules_dump(struct net *net, struct notifier_block *nb);
350 unsigned int fib4_rules_seq_read(struct net *net);
351 
352 static 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 */
373 extern const struct nla_policy rtm_ipv4_policy[];
374 void ip_fib_init(void);
375 __be32 fib_compute_spec_dst(struct sk_buff *skb);
376 int 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
380 static inline int fib_num_tclassid_users(struct net *net)
381 {
382         return net->ipv4.fib_num_tclassid_users;
383 }
384 #else
385 static inline int fib_num_tclassid_users(struct net *net)
386 {
387         return 0;
388 }
389 #endif
390 int fib_unmerge(struct net *net);
391 
392 /* Exported by fib_semantics.c */
393 int ip_fib_check_default(__be32 gw, struct net_device *dev);
394 int fib_sync_down_dev(struct net_device *dev, unsigned long event, bool force);
395 int fib_sync_down_addr(struct net_device *dev, __be32 local);
396 int fib_sync_up(struct net_device *dev, unsigned int nh_flags);
397 void fib_sync_mtu(struct net_device *dev, u32 orig_mtu);
398 
399 #ifdef CONFIG_IP_ROUTE_MULTIPATH
400 int fib_multipath_hash(const struct net *net, const struct flowi4 *fl4,
401                        const struct sk_buff *skb, struct flow_keys *flkeys);
402 #endif
403 void fib_select_multipath(struct fib_result *res, int hash);
404 void fib_select_path(struct net *net, struct fib_result *res,
405                      struct flowi4 *fl4, const struct sk_buff *skb);
406 
407 /* Exported by fib_trie.c */
408 void fib_trie_init(void);
409 struct fib_table *fib_trie_table(u32 id, struct fib_table *alias);
410 
411 static inline void fib_combine_itag(u32 *itag, const struct fib_result *res)
412 {
413 #ifdef CONFIG_IP_ROUTE_CLASSID
414 #ifdef CONFIG_IP_MULTIPLE_TABLES
415         u32 rtag;
416 #endif
417         *itag = FIB_RES_NH(*res).nh_tclassid<<16;
418 #ifdef CONFIG_IP_MULTIPLE_TABLES
419         rtag = res->tclassid;
420         if (*itag == 0)
421                 *itag = (rtag<<16);
422         *itag |= (rtag>>16);
423 #endif
424 #endif
425 }
426 
427 void free_fib_info(struct fib_info *fi);
428 
429 static inline void fib_info_hold(struct fib_info *fi)
430 {
431         refcount_inc(&fi->fib_clntref);
432 }
433 
434 static inline void fib_info_put(struct fib_info *fi)
435 {
436         if (refcount_dec_and_test(&fi->fib_clntref))
437                 free_fib_info(fi);
438 }
439 
440 #ifdef CONFIG_PROC_FS
441 int __net_init fib_proc_init(struct net *net);
442 void __net_exit fib_proc_exit(struct net *net);
443 #else
444 static inline int fib_proc_init(struct net *net)
445 {
446         return 0;
447 }
448 static inline void fib_proc_exit(struct net *net)
449 {
450 }
451 #endif
452 
453 u32 ip_mtu_from_fib_result(struct fib_result *res, __be32 daddr);
454 
455 #endif  /* _NET_FIB_H */
456 

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