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TOMOYO Linux Cross Reference
Linux/include/net/ip6_fib.h

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  1 /*
  2  *      Linux INET6 implementation 
  3  *
  4  *      Authors:
  5  *      Pedro Roque             <roque@di.fc.ul.pt>     
  6  *
  7  *      This program is free software; you can redistribute it and/or
  8  *      modify it under the terms of the GNU General Public License
  9  *      as published by the Free Software Foundation; either version
 10  *      2 of the License, or (at your option) any later version.
 11  */
 12 
 13 #ifndef _IP6_FIB_H
 14 #define _IP6_FIB_H
 15 
 16 #include <linux/ipv6_route.h>
 17 #include <linux/rtnetlink.h>
 18 #include <linux/spinlock.h>
 19 #include <linux/notifier.h>
 20 #include <net/dst.h>
 21 #include <net/flow.h>
 22 #include <net/netlink.h>
 23 #include <net/inetpeer.h>
 24 #include <net/fib_notifier.h>
 25 
 26 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
 27 #define FIB6_TABLE_HASHSZ 256
 28 #else
 29 #define FIB6_TABLE_HASHSZ 1
 30 #endif
 31 
 32 #define RT6_DEBUG 2
 33 
 34 #if RT6_DEBUG >= 3
 35 #define RT6_TRACE(x...) pr_debug(x)
 36 #else
 37 #define RT6_TRACE(x...) do { ; } while (0)
 38 #endif
 39 
 40 struct rt6_info;
 41 struct fib6_info;
 42 
 43 struct fib6_config {
 44         u32             fc_table;
 45         u32             fc_metric;
 46         int             fc_dst_len;
 47         int             fc_src_len;
 48         int             fc_ifindex;
 49         u32             fc_flags;
 50         u32             fc_protocol;
 51         u16             fc_type;        /* only 8 bits are used */
 52         u16             fc_delete_all_nh : 1,
 53                         __unused : 15;
 54 
 55         struct in6_addr fc_dst;
 56         struct in6_addr fc_src;
 57         struct in6_addr fc_prefsrc;
 58         struct in6_addr fc_gateway;
 59 
 60         unsigned long   fc_expires;
 61         struct nlattr   *fc_mx;
 62         int             fc_mx_len;
 63         int             fc_mp_len;
 64         struct nlattr   *fc_mp;
 65 
 66         struct nl_info  fc_nlinfo;
 67         struct nlattr   *fc_encap;
 68         u16             fc_encap_type;
 69 };
 70 
 71 struct fib6_node {
 72         struct fib6_node __rcu  *parent;
 73         struct fib6_node __rcu  *left;
 74         struct fib6_node __rcu  *right;
 75 #ifdef CONFIG_IPV6_SUBTREES
 76         struct fib6_node __rcu  *subtree;
 77 #endif
 78         struct fib6_info __rcu  *leaf;
 79 
 80         __u16                   fn_bit;         /* bit key */
 81         __u16                   fn_flags;
 82         int                     fn_sernum;
 83         struct fib6_info __rcu  *rr_ptr;
 84         struct rcu_head         rcu;
 85 };
 86 
 87 struct fib6_gc_args {
 88         int                     timeout;
 89         int                     more;
 90 };
 91 
 92 #ifndef CONFIG_IPV6_SUBTREES
 93 #define FIB6_SUBTREE(fn)        NULL
 94 #else
 95 #define FIB6_SUBTREE(fn)        (rcu_dereference_protected((fn)->subtree, 1))
 96 #endif
 97 
 98 /*
 99  *      routing information
100  *
101  */
102 
103 struct rt6key {
104         struct in6_addr addr;
105         int             plen;
106 };
107 
108 struct fib6_table;
109 
110 struct rt6_exception_bucket {
111         struct hlist_head       chain;
112         int                     depth;
113 };
114 
115 struct rt6_exception {
116         struct hlist_node       hlist;
117         struct rt6_info         *rt6i;
118         unsigned long           stamp;
119         struct rcu_head         rcu;
120 };
121 
122 #define FIB6_EXCEPTION_BUCKET_SIZE_SHIFT 10
123 #define FIB6_EXCEPTION_BUCKET_SIZE (1 << FIB6_EXCEPTION_BUCKET_SIZE_SHIFT)
124 #define FIB6_MAX_DEPTH 5
125 
126 struct fib6_nh {
127         struct in6_addr         nh_gw;
128         struct net_device       *nh_dev;
129         struct lwtunnel_state   *nh_lwtstate;
130 
131         unsigned int            nh_flags;
132         atomic_t                nh_upper_bound;
133         int                     nh_weight;
134 };
135 
136 struct fib6_info {
137         struct fib6_table               *fib6_table;
138         struct fib6_info __rcu          *fib6_next;
139         struct fib6_node __rcu          *fib6_node;
140 
141         /* Multipath routes:
142          * siblings is a list of fib6_info that have the the same metric/weight,
143          * destination, but not the same gateway. nsiblings is just a cache
144          * to speed up lookup.
145          */
146         struct list_head                fib6_siblings;
147         unsigned int                    fib6_nsiblings;
148 
149         atomic_t                        fib6_ref;
150         unsigned long                   expires;
151         struct dst_metrics              *fib6_metrics;
152 #define fib6_pmtu               fib6_metrics->metrics[RTAX_MTU-1]
153 
154         struct rt6key                   fib6_dst;
155         u32                             fib6_flags;
156         struct rt6key                   fib6_src;
157         struct rt6key                   fib6_prefsrc;
158 
159         struct rt6_info * __percpu      *rt6i_pcpu;
160         struct rt6_exception_bucket __rcu *rt6i_exception_bucket;
161 
162 #ifdef CONFIG_IPV6_ROUTER_PREF
163         unsigned long                   last_probe;
164 #endif
165 
166         u32                             fib6_metric;
167         u8                              fib6_protocol;
168         u8                              fib6_type;
169         u8                              exception_bucket_flushed:1,
170                                         should_flush:1,
171                                         dst_nocount:1,
172                                         dst_nopolicy:1,
173                                         dst_host:1,
174                                         unused:3;
175 
176         struct fib6_nh                  fib6_nh;
177         struct rcu_head                 rcu;
178 };
179 
180 struct rt6_info {
181         struct dst_entry                dst;
182         struct fib6_info __rcu          *from;
183 
184         struct rt6key                   rt6i_dst;
185         struct rt6key                   rt6i_src;
186         struct in6_addr                 rt6i_gateway;
187         struct inet6_dev                *rt6i_idev;
188         u32                             rt6i_flags;
189         struct rt6key                   rt6i_prefsrc;
190 
191         struct list_head                rt6i_uncached;
192         struct uncached_list            *rt6i_uncached_list;
193 
194         /* more non-fragment space at head required */
195         unsigned short                  rt6i_nfheader_len;
196 };
197 
198 #define for_each_fib6_node_rt_rcu(fn)                                   \
199         for (rt = rcu_dereference((fn)->leaf); rt;                      \
200              rt = rcu_dereference(rt->fib6_next))
201 
202 #define for_each_fib6_walker_rt(w)                                      \
203         for (rt = (w)->leaf; rt;                                        \
204              rt = rcu_dereference_protected(rt->fib6_next, 1))
205 
206 static inline struct inet6_dev *ip6_dst_idev(struct dst_entry *dst)
207 {
208         return ((struct rt6_info *)dst)->rt6i_idev;
209 }
210 
211 static inline void fib6_clean_expires(struct fib6_info *f6i)
212 {
213         f6i->fib6_flags &= ~RTF_EXPIRES;
214         f6i->expires = 0;
215 }
216 
217 static inline void fib6_set_expires(struct fib6_info *f6i,
218                                     unsigned long expires)
219 {
220         f6i->expires = expires;
221         f6i->fib6_flags |= RTF_EXPIRES;
222 }
223 
224 static inline bool fib6_check_expired(const struct fib6_info *f6i)
225 {
226         if (f6i->fib6_flags & RTF_EXPIRES)
227                 return time_after(jiffies, f6i->expires);
228         return false;
229 }
230 
231 /* Function to safely get fn->sernum for passed in rt
232  * and store result in passed in cookie.
233  * Return true if we can get cookie safely
234  * Return false if not
235  */
236 static inline bool fib6_get_cookie_safe(const struct fib6_info *f6i,
237                                         u32 *cookie)
238 {
239         struct fib6_node *fn;
240         bool status = false;
241 
242         fn = rcu_dereference(f6i->fib6_node);
243 
244         if (fn) {
245                 *cookie = fn->fn_sernum;
246                 /* pairs with smp_wmb() in fib6_update_sernum_upto_root() */
247                 smp_rmb();
248                 status = true;
249         }
250 
251         return status;
252 }
253 
254 static inline u32 rt6_get_cookie(const struct rt6_info *rt)
255 {
256         struct fib6_info *from;
257         u32 cookie = 0;
258 
259         rcu_read_lock();
260 
261         from = rcu_dereference(rt->from);
262         if (from && (rt->rt6i_flags & RTF_PCPU ||
263             unlikely(!list_empty(&rt->rt6i_uncached))))
264                 fib6_get_cookie_safe(from, &cookie);
265 
266         rcu_read_unlock();
267 
268         return cookie;
269 }
270 
271 static inline void ip6_rt_put(struct rt6_info *rt)
272 {
273         /* dst_release() accepts a NULL parameter.
274          * We rely on dst being first structure in struct rt6_info
275          */
276         BUILD_BUG_ON(offsetof(struct rt6_info, dst) != 0);
277         dst_release(&rt->dst);
278 }
279 
280 struct fib6_info *fib6_info_alloc(gfp_t gfp_flags);
281 void fib6_info_destroy_rcu(struct rcu_head *head);
282 
283 static inline void fib6_info_hold(struct fib6_info *f6i)
284 {
285         atomic_inc(&f6i->fib6_ref);
286 }
287 
288 static inline bool fib6_info_hold_safe(struct fib6_info *f6i)
289 {
290         return atomic_inc_not_zero(&f6i->fib6_ref);
291 }
292 
293 static inline void fib6_info_release(struct fib6_info *f6i)
294 {
295         if (f6i && atomic_dec_and_test(&f6i->fib6_ref))
296                 call_rcu(&f6i->rcu, fib6_info_destroy_rcu);
297 }
298 
299 enum fib6_walk_state {
300 #ifdef CONFIG_IPV6_SUBTREES
301         FWS_S,
302 #endif
303         FWS_L,
304         FWS_R,
305         FWS_C,
306         FWS_U
307 };
308 
309 struct fib6_walker {
310         struct list_head lh;
311         struct fib6_node *root, *node;
312         struct fib6_info *leaf;
313         enum fib6_walk_state state;
314         unsigned int skip;
315         unsigned int count;
316         int (*func)(struct fib6_walker *);
317         void *args;
318 };
319 
320 struct rt6_statistics {
321         __u32           fib_nodes;              /* all fib6 nodes */
322         __u32           fib_route_nodes;        /* intermediate nodes */
323         __u32           fib_rt_entries;         /* rt entries in fib table */
324         __u32           fib_rt_cache;           /* cached rt entries in exception table */
325         __u32           fib_discarded_routes;   /* total number of routes delete */
326 
327         /* The following stats are not protected by any lock */
328         atomic_t        fib_rt_alloc;           /* total number of routes alloced */
329         atomic_t        fib_rt_uncache;         /* rt entries in uncached list */
330 };
331 
332 #define RTN_TL_ROOT     0x0001
333 #define RTN_ROOT        0x0002          /* tree root node               */
334 #define RTN_RTINFO      0x0004          /* node with valid routing info */
335 
336 /*
337  *      priority levels (or metrics)
338  *
339  */
340 
341 
342 struct fib6_table {
343         struct hlist_node       tb6_hlist;
344         u32                     tb6_id;
345         spinlock_t              tb6_lock;
346         struct fib6_node        tb6_root;
347         struct inet_peer_base   tb6_peers;
348         unsigned int            flags;
349         unsigned int            fib_seq;
350 #define RT6_TABLE_HAS_DFLT_ROUTER       BIT(0)
351 };
352 
353 #define RT6_TABLE_UNSPEC        RT_TABLE_UNSPEC
354 #define RT6_TABLE_MAIN          RT_TABLE_MAIN
355 #define RT6_TABLE_DFLT          RT6_TABLE_MAIN
356 #define RT6_TABLE_INFO          RT6_TABLE_MAIN
357 #define RT6_TABLE_PREFIX        RT6_TABLE_MAIN
358 
359 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
360 #define FIB6_TABLE_MIN          1
361 #define FIB6_TABLE_MAX          RT_TABLE_MAX
362 #define RT6_TABLE_LOCAL         RT_TABLE_LOCAL
363 #else
364 #define FIB6_TABLE_MIN          RT_TABLE_MAIN
365 #define FIB6_TABLE_MAX          FIB6_TABLE_MIN
366 #define RT6_TABLE_LOCAL         RT6_TABLE_MAIN
367 #endif
368 
369 typedef struct rt6_info *(*pol_lookup_t)(struct net *,
370                                          struct fib6_table *,
371                                          struct flowi6 *,
372                                          const struct sk_buff *, int);
373 
374 struct fib6_entry_notifier_info {
375         struct fib_notifier_info info; /* must be first */
376         struct fib6_info *rt;
377 };
378 
379 /*
380  *      exported functions
381  */
382 
383 struct fib6_table *fib6_get_table(struct net *net, u32 id);
384 struct fib6_table *fib6_new_table(struct net *net, u32 id);
385 struct dst_entry *fib6_rule_lookup(struct net *net, struct flowi6 *fl6,
386                                    const struct sk_buff *skb,
387                                    int flags, pol_lookup_t lookup);
388 
389 /* called with rcu lock held; can return error pointer
390  * caller needs to select path
391  */
392 struct fib6_info *fib6_lookup(struct net *net, int oif, struct flowi6 *fl6,
393                               int flags);
394 
395 /* called with rcu lock held; caller needs to select path */
396 struct fib6_info *fib6_table_lookup(struct net *net, struct fib6_table *table,
397                                     int oif, struct flowi6 *fl6, int strict);
398 
399 struct fib6_info *fib6_multipath_select(const struct net *net,
400                                         struct fib6_info *match,
401                                         struct flowi6 *fl6, int oif,
402                                         const struct sk_buff *skb, int strict);
403 
404 struct fib6_node *fib6_node_lookup(struct fib6_node *root,
405                                    const struct in6_addr *daddr,
406                                    const struct in6_addr *saddr);
407 
408 struct fib6_node *fib6_locate(struct fib6_node *root,
409                               const struct in6_addr *daddr, int dst_len,
410                               const struct in6_addr *saddr, int src_len,
411                               bool exact_match);
412 
413 void fib6_clean_all(struct net *net, int (*func)(struct fib6_info *, void *arg),
414                     void *arg);
415 
416 int fib6_add(struct fib6_node *root, struct fib6_info *rt,
417              struct nl_info *info, struct netlink_ext_ack *extack);
418 int fib6_del(struct fib6_info *rt, struct nl_info *info);
419 
420 static inline struct net_device *fib6_info_nh_dev(const struct fib6_info *f6i)
421 {
422         return f6i->fib6_nh.nh_dev;
423 }
424 
425 static inline
426 struct lwtunnel_state *fib6_info_nh_lwt(const struct fib6_info *f6i)
427 {
428         return f6i->fib6_nh.nh_lwtstate;
429 }
430 
431 void inet6_rt_notify(int event, struct fib6_info *rt, struct nl_info *info,
432                      unsigned int flags);
433 
434 void fib6_run_gc(unsigned long expires, struct net *net, bool force);
435 
436 void fib6_gc_cleanup(void);
437 
438 int fib6_init(void);
439 
440 struct ipv6_route_iter {
441         struct seq_net_private p;
442         struct fib6_walker w;
443         loff_t skip;
444         struct fib6_table *tbl;
445         int sernum;
446 };
447 
448 extern const struct seq_operations ipv6_route_seq_ops;
449 
450 int call_fib6_notifier(struct notifier_block *nb, struct net *net,
451                        enum fib_event_type event_type,
452                        struct fib_notifier_info *info);
453 int call_fib6_notifiers(struct net *net, enum fib_event_type event_type,
454                         struct fib_notifier_info *info);
455 
456 int __net_init fib6_notifier_init(struct net *net);
457 void __net_exit fib6_notifier_exit(struct net *net);
458 
459 unsigned int fib6_tables_seq_read(struct net *net);
460 int fib6_tables_dump(struct net *net, struct notifier_block *nb);
461 
462 void fib6_update_sernum(struct net *net, struct fib6_info *rt);
463 void fib6_update_sernum_upto_root(struct net *net, struct fib6_info *rt);
464 
465 void fib6_metric_set(struct fib6_info *f6i, int metric, u32 val);
466 static inline bool fib6_metric_locked(struct fib6_info *f6i, int metric)
467 {
468         return !!(f6i->fib6_metrics->metrics[RTAX_LOCK - 1] & (1 << metric));
469 }
470 
471 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
472 int fib6_rules_init(void);
473 void fib6_rules_cleanup(void);
474 bool fib6_rule_default(const struct fib_rule *rule);
475 int fib6_rules_dump(struct net *net, struct notifier_block *nb);
476 unsigned int fib6_rules_seq_read(struct net *net);
477 
478 static inline bool fib6_rules_early_flow_dissect(struct net *net,
479                                                  struct sk_buff *skb,
480                                                  struct flowi6 *fl6,
481                                                  struct flow_keys *flkeys)
482 {
483         unsigned int flag = FLOW_DISSECTOR_F_STOP_AT_ENCAP;
484 
485         if (!net->ipv6.fib6_rules_require_fldissect)
486                 return false;
487 
488         skb_flow_dissect_flow_keys(skb, flkeys, flag);
489         fl6->fl6_sport = flkeys->ports.src;
490         fl6->fl6_dport = flkeys->ports.dst;
491         fl6->flowi6_proto = flkeys->basic.ip_proto;
492 
493         return true;
494 }
495 #else
496 static inline int               fib6_rules_init(void)
497 {
498         return 0;
499 }
500 static inline void              fib6_rules_cleanup(void)
501 {
502         return ;
503 }
504 static inline bool fib6_rule_default(const struct fib_rule *rule)
505 {
506         return true;
507 }
508 static inline int fib6_rules_dump(struct net *net, struct notifier_block *nb)
509 {
510         return 0;
511 }
512 static inline unsigned int fib6_rules_seq_read(struct net *net)
513 {
514         return 0;
515 }
516 static inline bool fib6_rules_early_flow_dissect(struct net *net,
517                                                  struct sk_buff *skb,
518                                                  struct flowi6 *fl6,
519                                                  struct flow_keys *flkeys)
520 {
521         return false;
522 }
523 #endif
524 #endif
525 

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