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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         u32                             fib6_metric;
163         u8                              fib6_protocol;
164         u8                              fib6_type;
165         u8                              exception_bucket_flushed:1,
166                                         should_flush:1,
167                                         dst_nocount:1,
168                                         dst_nopolicy:1,
169                                         dst_host:1,
170                                         unused:3;
171 
172         struct fib6_nh                  fib6_nh;
173         struct rcu_head                 rcu;
174 };
175 
176 struct rt6_info {
177         struct dst_entry                dst;
178         struct fib6_info __rcu          *from;
179 
180         struct rt6key                   rt6i_dst;
181         struct rt6key                   rt6i_src;
182         struct in6_addr                 rt6i_gateway;
183         struct inet6_dev                *rt6i_idev;
184         u32                             rt6i_flags;
185         struct rt6key                   rt6i_prefsrc;
186 
187         struct list_head                rt6i_uncached;
188         struct uncached_list            *rt6i_uncached_list;
189 
190         /* more non-fragment space at head required */
191         unsigned short                  rt6i_nfheader_len;
192 };
193 
194 #define for_each_fib6_node_rt_rcu(fn)                                   \
195         for (rt = rcu_dereference((fn)->leaf); rt;                      \
196              rt = rcu_dereference(rt->fib6_next))
197 
198 #define for_each_fib6_walker_rt(w)                                      \
199         for (rt = (w)->leaf; rt;                                        \
200              rt = rcu_dereference_protected(rt->fib6_next, 1))
201 
202 static inline struct inet6_dev *ip6_dst_idev(struct dst_entry *dst)
203 {
204         return ((struct rt6_info *)dst)->rt6i_idev;
205 }
206 
207 static inline void fib6_clean_expires(struct fib6_info *f6i)
208 {
209         f6i->fib6_flags &= ~RTF_EXPIRES;
210         f6i->expires = 0;
211 }
212 
213 static inline void fib6_set_expires(struct fib6_info *f6i,
214                                     unsigned long expires)
215 {
216         f6i->expires = expires;
217         f6i->fib6_flags |= RTF_EXPIRES;
218 }
219 
220 static inline bool fib6_check_expired(const struct fib6_info *f6i)
221 {
222         if (f6i->fib6_flags & RTF_EXPIRES)
223                 return time_after(jiffies, f6i->expires);
224         return false;
225 }
226 
227 /* Function to safely get fn->sernum for passed in rt
228  * and store result in passed in cookie.
229  * Return true if we can get cookie safely
230  * Return false if not
231  */
232 static inline bool fib6_get_cookie_safe(const struct fib6_info *f6i,
233                                         u32 *cookie)
234 {
235         struct fib6_node *fn;
236         bool status = false;
237 
238         fn = rcu_dereference(f6i->fib6_node);
239 
240         if (fn) {
241                 *cookie = fn->fn_sernum;
242                 /* pairs with smp_wmb() in fib6_update_sernum_upto_root() */
243                 smp_rmb();
244                 status = true;
245         }
246 
247         return status;
248 }
249 
250 static inline u32 rt6_get_cookie(const struct rt6_info *rt)
251 {
252         struct fib6_info *from;
253         u32 cookie = 0;
254 
255         rcu_read_lock();
256 
257         from = rcu_dereference(rt->from);
258         if (from && (rt->rt6i_flags & RTF_PCPU ||
259             unlikely(!list_empty(&rt->rt6i_uncached))))
260                 fib6_get_cookie_safe(from, &cookie);
261 
262         rcu_read_unlock();
263 
264         return cookie;
265 }
266 
267 static inline void ip6_rt_put(struct rt6_info *rt)
268 {
269         /* dst_release() accepts a NULL parameter.
270          * We rely on dst being first structure in struct rt6_info
271          */
272         BUILD_BUG_ON(offsetof(struct rt6_info, dst) != 0);
273         dst_release(&rt->dst);
274 }
275 
276 struct fib6_info *fib6_info_alloc(gfp_t gfp_flags);
277 void fib6_info_destroy_rcu(struct rcu_head *head);
278 
279 static inline void fib6_info_hold(struct fib6_info *f6i)
280 {
281         atomic_inc(&f6i->fib6_ref);
282 }
283 
284 static inline bool fib6_info_hold_safe(struct fib6_info *f6i)
285 {
286         return atomic_inc_not_zero(&f6i->fib6_ref);
287 }
288 
289 static inline void fib6_info_release(struct fib6_info *f6i)
290 {
291         if (f6i && atomic_dec_and_test(&f6i->fib6_ref))
292                 call_rcu(&f6i->rcu, fib6_info_destroy_rcu);
293 }
294 
295 enum fib6_walk_state {
296 #ifdef CONFIG_IPV6_SUBTREES
297         FWS_S,
298 #endif
299         FWS_L,
300         FWS_R,
301         FWS_C,
302         FWS_U
303 };
304 
305 struct fib6_walker {
306         struct list_head lh;
307         struct fib6_node *root, *node;
308         struct fib6_info *leaf;
309         enum fib6_walk_state state;
310         unsigned int skip;
311         unsigned int count;
312         int (*func)(struct fib6_walker *);
313         void *args;
314 };
315 
316 struct rt6_statistics {
317         __u32           fib_nodes;              /* all fib6 nodes */
318         __u32           fib_route_nodes;        /* intermediate nodes */
319         __u32           fib_rt_entries;         /* rt entries in fib table */
320         __u32           fib_rt_cache;           /* cached rt entries in exception table */
321         __u32           fib_discarded_routes;   /* total number of routes delete */
322 
323         /* The following stats are not protected by any lock */
324         atomic_t        fib_rt_alloc;           /* total number of routes alloced */
325         atomic_t        fib_rt_uncache;         /* rt entries in uncached list */
326 };
327 
328 #define RTN_TL_ROOT     0x0001
329 #define RTN_ROOT        0x0002          /* tree root node               */
330 #define RTN_RTINFO      0x0004          /* node with valid routing info */
331 
332 /*
333  *      priority levels (or metrics)
334  *
335  */
336 
337 
338 struct fib6_table {
339         struct hlist_node       tb6_hlist;
340         u32                     tb6_id;
341         spinlock_t              tb6_lock;
342         struct fib6_node        tb6_root;
343         struct inet_peer_base   tb6_peers;
344         unsigned int            flags;
345         unsigned int            fib_seq;
346 #define RT6_TABLE_HAS_DFLT_ROUTER       BIT(0)
347 };
348 
349 #define RT6_TABLE_UNSPEC        RT_TABLE_UNSPEC
350 #define RT6_TABLE_MAIN          RT_TABLE_MAIN
351 #define RT6_TABLE_DFLT          RT6_TABLE_MAIN
352 #define RT6_TABLE_INFO          RT6_TABLE_MAIN
353 #define RT6_TABLE_PREFIX        RT6_TABLE_MAIN
354 
355 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
356 #define FIB6_TABLE_MIN          1
357 #define FIB6_TABLE_MAX          RT_TABLE_MAX
358 #define RT6_TABLE_LOCAL         RT_TABLE_LOCAL
359 #else
360 #define FIB6_TABLE_MIN          RT_TABLE_MAIN
361 #define FIB6_TABLE_MAX          FIB6_TABLE_MIN
362 #define RT6_TABLE_LOCAL         RT6_TABLE_MAIN
363 #endif
364 
365 typedef struct rt6_info *(*pol_lookup_t)(struct net *,
366                                          struct fib6_table *,
367                                          struct flowi6 *,
368                                          const struct sk_buff *, int);
369 
370 struct fib6_entry_notifier_info {
371         struct fib_notifier_info info; /* must be first */
372         struct fib6_info *rt;
373 };
374 
375 /*
376  *      exported functions
377  */
378 
379 struct fib6_table *fib6_get_table(struct net *net, u32 id);
380 struct fib6_table *fib6_new_table(struct net *net, u32 id);
381 struct dst_entry *fib6_rule_lookup(struct net *net, struct flowi6 *fl6,
382                                    const struct sk_buff *skb,
383                                    int flags, pol_lookup_t lookup);
384 
385 /* called with rcu lock held; can return error pointer
386  * caller needs to select path
387  */
388 struct fib6_info *fib6_lookup(struct net *net, int oif, struct flowi6 *fl6,
389                               int flags);
390 
391 /* called with rcu lock held; caller needs to select path */
392 struct fib6_info *fib6_table_lookup(struct net *net, struct fib6_table *table,
393                                     int oif, struct flowi6 *fl6, int strict);
394 
395 struct fib6_info *fib6_multipath_select(const struct net *net,
396                                         struct fib6_info *match,
397                                         struct flowi6 *fl6, int oif,
398                                         const struct sk_buff *skb, int strict);
399 
400 struct fib6_node *fib6_node_lookup(struct fib6_node *root,
401                                    const struct in6_addr *daddr,
402                                    const struct in6_addr *saddr);
403 
404 struct fib6_node *fib6_locate(struct fib6_node *root,
405                               const struct in6_addr *daddr, int dst_len,
406                               const struct in6_addr *saddr, int src_len,
407                               bool exact_match);
408 
409 void fib6_clean_all(struct net *net, int (*func)(struct fib6_info *, void *arg),
410                     void *arg);
411 
412 int fib6_add(struct fib6_node *root, struct fib6_info *rt,
413              struct nl_info *info, struct netlink_ext_ack *extack);
414 int fib6_del(struct fib6_info *rt, struct nl_info *info);
415 
416 static inline struct net_device *fib6_info_nh_dev(const struct fib6_info *f6i)
417 {
418         return f6i->fib6_nh.nh_dev;
419 }
420 
421 static inline
422 struct lwtunnel_state *fib6_info_nh_lwt(const struct fib6_info *f6i)
423 {
424         return f6i->fib6_nh.nh_lwtstate;
425 }
426 
427 void inet6_rt_notify(int event, struct fib6_info *rt, struct nl_info *info,
428                      unsigned int flags);
429 
430 void fib6_run_gc(unsigned long expires, struct net *net, bool force);
431 
432 void fib6_gc_cleanup(void);
433 
434 int fib6_init(void);
435 
436 struct ipv6_route_iter {
437         struct seq_net_private p;
438         struct fib6_walker w;
439         loff_t skip;
440         struct fib6_table *tbl;
441         int sernum;
442 };
443 
444 extern const struct seq_operations ipv6_route_seq_ops;
445 
446 int call_fib6_notifier(struct notifier_block *nb, struct net *net,
447                        enum fib_event_type event_type,
448                        struct fib_notifier_info *info);
449 int call_fib6_notifiers(struct net *net, enum fib_event_type event_type,
450                         struct fib_notifier_info *info);
451 
452 int __net_init fib6_notifier_init(struct net *net);
453 void __net_exit fib6_notifier_exit(struct net *net);
454 
455 unsigned int fib6_tables_seq_read(struct net *net);
456 int fib6_tables_dump(struct net *net, struct notifier_block *nb);
457 
458 void fib6_update_sernum(struct net *net, struct fib6_info *rt);
459 void fib6_update_sernum_upto_root(struct net *net, struct fib6_info *rt);
460 
461 void fib6_metric_set(struct fib6_info *f6i, int metric, u32 val);
462 static inline bool fib6_metric_locked(struct fib6_info *f6i, int metric)
463 {
464         return !!(f6i->fib6_metrics->metrics[RTAX_LOCK - 1] & (1 << metric));
465 }
466 
467 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
468 int fib6_rules_init(void);
469 void fib6_rules_cleanup(void);
470 bool fib6_rule_default(const struct fib_rule *rule);
471 int fib6_rules_dump(struct net *net, struct notifier_block *nb);
472 unsigned int fib6_rules_seq_read(struct net *net);
473 
474 static inline bool fib6_rules_early_flow_dissect(struct net *net,
475                                                  struct sk_buff *skb,
476                                                  struct flowi6 *fl6,
477                                                  struct flow_keys *flkeys)
478 {
479         unsigned int flag = FLOW_DISSECTOR_F_STOP_AT_ENCAP;
480 
481         if (!net->ipv6.fib6_rules_require_fldissect)
482                 return false;
483 
484         skb_flow_dissect_flow_keys(skb, flkeys, flag);
485         fl6->fl6_sport = flkeys->ports.src;
486         fl6->fl6_dport = flkeys->ports.dst;
487         fl6->flowi6_proto = flkeys->basic.ip_proto;
488 
489         return true;
490 }
491 #else
492 static inline int               fib6_rules_init(void)
493 {
494         return 0;
495 }
496 static inline void              fib6_rules_cleanup(void)
497 {
498         return ;
499 }
500 static inline bool fib6_rule_default(const struct fib_rule *rule)
501 {
502         return true;
503 }
504 static inline int fib6_rules_dump(struct net *net, struct notifier_block *nb)
505 {
506         return 0;
507 }
508 static inline unsigned int fib6_rules_seq_read(struct net *net)
509 {
510         return 0;
511 }
512 static inline bool fib6_rules_early_flow_dissect(struct net *net,
513                                                  struct sk_buff *skb,
514                                                  struct flowi6 *fl6,
515                                                  struct flow_keys *flkeys)
516 {
517         return false;
518 }
519 #endif
520 #endif
521 

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