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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 
 42 struct fib6_config {
 43         u32             fc_table;
 44         u32             fc_metric;
 45         int             fc_dst_len;
 46         int             fc_src_len;
 47         int             fc_ifindex;
 48         u32             fc_flags;
 49         u32             fc_protocol;
 50         u16             fc_type;        /* only 8 bits are used */
 51         u16             fc_delete_all_nh : 1,
 52                         __unused : 15;
 53 
 54         struct in6_addr fc_dst;
 55         struct in6_addr fc_src;
 56         struct in6_addr fc_prefsrc;
 57         struct in6_addr fc_gateway;
 58 
 59         unsigned long   fc_expires;
 60         struct nlattr   *fc_mx;
 61         int             fc_mx_len;
 62         int             fc_mp_len;
 63         struct nlattr   *fc_mp;
 64 
 65         struct nl_info  fc_nlinfo;
 66         struct nlattr   *fc_encap;
 67         u16             fc_encap_type;
 68 };
 69 
 70 struct fib6_node {
 71         struct fib6_node __rcu  *parent;
 72         struct fib6_node __rcu  *left;
 73         struct fib6_node __rcu  *right;
 74 #ifdef CONFIG_IPV6_SUBTREES
 75         struct fib6_node __rcu  *subtree;
 76 #endif
 77         struct rt6_info __rcu   *leaf;
 78 
 79         __u16                   fn_bit;         /* bit key */
 80         __u16                   fn_flags;
 81         int                     fn_sernum;
 82         struct rt6_info __rcu   *rr_ptr;
 83         struct rcu_head         rcu;
 84 };
 85 
 86 struct fib6_gc_args {
 87         int                     timeout;
 88         int                     more;
 89 };
 90 
 91 #ifndef CONFIG_IPV6_SUBTREES
 92 #define FIB6_SUBTREE(fn)        NULL
 93 #else
 94 #define FIB6_SUBTREE(fn)        (rcu_dereference_protected((fn)->subtree, 1))
 95 #endif
 96 
 97 struct mx6_config {
 98         const u32 *mx;
 99         DECLARE_BITMAP(mx_valid, RTAX_MAX);
100 };
101 
102 /*
103  *      routing information
104  *
105  */
106 
107 struct rt6key {
108         struct in6_addr addr;
109         int             plen;
110 };
111 
112 struct fib6_table;
113 
114 struct rt6_exception_bucket {
115         struct hlist_head       chain;
116         int                     depth;
117 };
118 
119 struct rt6_exception {
120         struct hlist_node       hlist;
121         struct rt6_info         *rt6i;
122         unsigned long           stamp;
123         struct rcu_head         rcu;
124 };
125 
126 #define FIB6_EXCEPTION_BUCKET_SIZE_SHIFT 10
127 #define FIB6_EXCEPTION_BUCKET_SIZE (1 << FIB6_EXCEPTION_BUCKET_SIZE_SHIFT)
128 #define FIB6_MAX_DEPTH 5
129 
130 struct rt6_info {
131         struct dst_entry                dst;
132         struct rt6_info __rcu           *rt6_next;
133         struct rt6_info                 *from;
134 
135         /*
136          * Tail elements of dst_entry (__refcnt etc.)
137          * and these elements (rarely used in hot path) are in
138          * the same cache line.
139          */
140         struct fib6_table               *rt6i_table;
141         struct fib6_node __rcu          *rt6i_node;
142 
143         struct in6_addr                 rt6i_gateway;
144 
145         /* Multipath routes:
146          * siblings is a list of rt6_info that have the the same metric/weight,
147          * destination, but not the same gateway. nsiblings is just a cache
148          * to speed up lookup.
149          */
150         struct list_head                rt6i_siblings;
151         unsigned int                    rt6i_nsiblings;
152         atomic_t                        rt6i_nh_upper_bound;
153 
154         atomic_t                        rt6i_ref;
155 
156         unsigned int                    rt6i_nh_flags;
157 
158         /* These are in a separate cache line. */
159         struct rt6key                   rt6i_dst ____cacheline_aligned_in_smp;
160         u32                             rt6i_flags;
161         struct rt6key                   rt6i_src;
162         struct rt6key                   rt6i_prefsrc;
163 
164         struct list_head                rt6i_uncached;
165         struct uncached_list            *rt6i_uncached_list;
166 
167         struct inet6_dev                *rt6i_idev;
168         struct rt6_info * __percpu      *rt6i_pcpu;
169         struct rt6_exception_bucket __rcu *rt6i_exception_bucket;
170 
171         u32                             rt6i_metric;
172         u32                             rt6i_pmtu;
173         /* more non-fragment space at head required */
174         int                             rt6i_nh_weight;
175         unsigned short                  rt6i_nfheader_len;
176         u8                              rt6i_protocol;
177         u8                              exception_bucket_flushed:1,
178                                         should_flush:1,
179                                         unused:6;
180 };
181 
182 #define for_each_fib6_node_rt_rcu(fn)                                   \
183         for (rt = rcu_dereference((fn)->leaf); rt;                      \
184              rt = rcu_dereference(rt->rt6_next))
185 
186 #define for_each_fib6_walker_rt(w)                                      \
187         for (rt = (w)->leaf; rt;                                        \
188              rt = rcu_dereference_protected(rt->rt6_next, 1))
189 
190 static inline struct inet6_dev *ip6_dst_idev(struct dst_entry *dst)
191 {
192         return ((struct rt6_info *)dst)->rt6i_idev;
193 }
194 
195 static inline void rt6_clean_expires(struct rt6_info *rt)
196 {
197         rt->rt6i_flags &= ~RTF_EXPIRES;
198         rt->dst.expires = 0;
199 }
200 
201 static inline void rt6_set_expires(struct rt6_info *rt, unsigned long expires)
202 {
203         rt->dst.expires = expires;
204         rt->rt6i_flags |= RTF_EXPIRES;
205 }
206 
207 static inline void rt6_update_expires(struct rt6_info *rt0, int timeout)
208 {
209         struct rt6_info *rt;
210 
211         for (rt = rt0; rt && !(rt->rt6i_flags & RTF_EXPIRES); rt = rt->from);
212         if (rt && rt != rt0)
213                 rt0->dst.expires = rt->dst.expires;
214         dst_set_expires(&rt0->dst, timeout);
215         rt0->rt6i_flags |= RTF_EXPIRES;
216 }
217 
218 /* Function to safely get fn->sernum for passed in rt
219  * and store result in passed in cookie.
220  * Return true if we can get cookie safely
221  * Return false if not
222  */
223 static inline bool rt6_get_cookie_safe(const struct rt6_info *rt,
224                                        u32 *cookie)
225 {
226         struct fib6_node *fn;
227         bool status = false;
228 
229         rcu_read_lock();
230         fn = rcu_dereference(rt->rt6i_node);
231 
232         if (fn) {
233                 *cookie = fn->fn_sernum;
234                 /* pairs with smp_wmb() in fib6_update_sernum_upto_root() */
235                 smp_rmb();
236                 status = true;
237         }
238 
239         rcu_read_unlock();
240         return status;
241 }
242 
243 static inline u32 rt6_get_cookie(const struct rt6_info *rt)
244 {
245         u32 cookie = 0;
246 
247         if (rt->rt6i_flags & RTF_PCPU ||
248             (unlikely(!list_empty(&rt->rt6i_uncached)) && rt->from))
249                 rt = rt->from;
250 
251         rt6_get_cookie_safe(rt, &cookie);
252 
253         return cookie;
254 }
255 
256 static inline void ip6_rt_put(struct rt6_info *rt)
257 {
258         /* dst_release() accepts a NULL parameter.
259          * We rely on dst being first structure in struct rt6_info
260          */
261         BUILD_BUG_ON(offsetof(struct rt6_info, dst) != 0);
262         dst_release(&rt->dst);
263 }
264 
265 void rt6_free_pcpu(struct rt6_info *non_pcpu_rt);
266 
267 static inline void rt6_hold(struct rt6_info *rt)
268 {
269         atomic_inc(&rt->rt6i_ref);
270 }
271 
272 static inline void rt6_release(struct rt6_info *rt)
273 {
274         if (atomic_dec_and_test(&rt->rt6i_ref)) {
275                 rt6_free_pcpu(rt);
276                 dst_dev_put(&rt->dst);
277                 dst_release(&rt->dst);
278         }
279 }
280 
281 enum fib6_walk_state {
282 #ifdef CONFIG_IPV6_SUBTREES
283         FWS_S,
284 #endif
285         FWS_L,
286         FWS_R,
287         FWS_C,
288         FWS_U
289 };
290 
291 struct fib6_walker {
292         struct list_head lh;
293         struct fib6_node *root, *node;
294         struct rt6_info *leaf;
295         enum fib6_walk_state state;
296         unsigned int skip;
297         unsigned int count;
298         int (*func)(struct fib6_walker *);
299         void *args;
300 };
301 
302 struct rt6_statistics {
303         __u32           fib_nodes;              /* all fib6 nodes */
304         __u32           fib_route_nodes;        /* intermediate nodes */
305         __u32           fib_rt_entries;         /* rt entries in fib table */
306         __u32           fib_rt_cache;           /* cached rt entries in exception table */
307         __u32           fib_discarded_routes;   /* total number of routes delete */
308 
309         /* The following stats are not protected by any lock */
310         atomic_t        fib_rt_alloc;           /* total number of routes alloced */
311         atomic_t        fib_rt_uncache;         /* rt entries in uncached list */
312 };
313 
314 #define RTN_TL_ROOT     0x0001
315 #define RTN_ROOT        0x0002          /* tree root node               */
316 #define RTN_RTINFO      0x0004          /* node with valid routing info */
317 
318 /*
319  *      priority levels (or metrics)
320  *
321  */
322 
323 
324 struct fib6_table {
325         struct hlist_node       tb6_hlist;
326         u32                     tb6_id;
327         spinlock_t              tb6_lock;
328         struct fib6_node        tb6_root;
329         struct inet_peer_base   tb6_peers;
330         unsigned int            flags;
331         unsigned int            fib_seq;
332 #define RT6_TABLE_HAS_DFLT_ROUTER       BIT(0)
333 };
334 
335 #define RT6_TABLE_UNSPEC        RT_TABLE_UNSPEC
336 #define RT6_TABLE_MAIN          RT_TABLE_MAIN
337 #define RT6_TABLE_DFLT          RT6_TABLE_MAIN
338 #define RT6_TABLE_INFO          RT6_TABLE_MAIN
339 #define RT6_TABLE_PREFIX        RT6_TABLE_MAIN
340 
341 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
342 #define FIB6_TABLE_MIN          1
343 #define FIB6_TABLE_MAX          RT_TABLE_MAX
344 #define RT6_TABLE_LOCAL         RT_TABLE_LOCAL
345 #else
346 #define FIB6_TABLE_MIN          RT_TABLE_MAIN
347 #define FIB6_TABLE_MAX          FIB6_TABLE_MIN
348 #define RT6_TABLE_LOCAL         RT6_TABLE_MAIN
349 #endif
350 
351 typedef struct rt6_info *(*pol_lookup_t)(struct net *,
352                                          struct fib6_table *,
353                                          struct flowi6 *,
354                                          const struct sk_buff *, int);
355 
356 struct fib6_entry_notifier_info {
357         struct fib_notifier_info info; /* must be first */
358         struct rt6_info *rt;
359 };
360 
361 /*
362  *      exported functions
363  */
364 
365 struct fib6_table *fib6_get_table(struct net *net, u32 id);
366 struct fib6_table *fib6_new_table(struct net *net, u32 id);
367 struct dst_entry *fib6_rule_lookup(struct net *net, struct flowi6 *fl6,
368                                    const struct sk_buff *skb,
369                                    int flags, pol_lookup_t lookup);
370 
371 struct fib6_node *fib6_lookup(struct fib6_node *root,
372                               const struct in6_addr *daddr,
373                               const struct in6_addr *saddr);
374 
375 struct fib6_node *fib6_locate(struct fib6_node *root,
376                               const struct in6_addr *daddr, int dst_len,
377                               const struct in6_addr *saddr, int src_len,
378                               bool exact_match);
379 
380 void fib6_clean_all(struct net *net, int (*func)(struct rt6_info *, void *arg),
381                     void *arg);
382 
383 int fib6_add(struct fib6_node *root, struct rt6_info *rt,
384              struct nl_info *info, struct mx6_config *mxc,
385              struct netlink_ext_ack *extack);
386 int fib6_del(struct rt6_info *rt, struct nl_info *info);
387 
388 void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info,
389                      unsigned int flags);
390 
391 void fib6_run_gc(unsigned long expires, struct net *net, bool force);
392 
393 void fib6_gc_cleanup(void);
394 
395 int fib6_init(void);
396 
397 int ipv6_route_open(struct inode *inode, struct file *file);
398 
399 int call_fib6_notifier(struct notifier_block *nb, struct net *net,
400                        enum fib_event_type event_type,
401                        struct fib_notifier_info *info);
402 int call_fib6_notifiers(struct net *net, enum fib_event_type event_type,
403                         struct fib_notifier_info *info);
404 
405 int __net_init fib6_notifier_init(struct net *net);
406 void __net_exit fib6_notifier_exit(struct net *net);
407 
408 unsigned int fib6_tables_seq_read(struct net *net);
409 int fib6_tables_dump(struct net *net, struct notifier_block *nb);
410 
411 void fib6_update_sernum(struct rt6_info *rt);
412 void fib6_update_sernum_upto_root(struct net *net, struct rt6_info *rt);
413 
414 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
415 int fib6_rules_init(void);
416 void fib6_rules_cleanup(void);
417 bool fib6_rule_default(const struct fib_rule *rule);
418 int fib6_rules_dump(struct net *net, struct notifier_block *nb);
419 unsigned int fib6_rules_seq_read(struct net *net);
420 
421 static inline bool fib6_rules_early_flow_dissect(struct net *net,
422                                                  struct sk_buff *skb,
423                                                  struct flowi6 *fl6,
424                                                  struct flow_keys *flkeys)
425 {
426         unsigned int flag = FLOW_DISSECTOR_F_STOP_AT_ENCAP;
427 
428         if (!net->ipv6.fib6_rules_require_fldissect)
429                 return false;
430 
431         skb_flow_dissect_flow_keys(skb, flkeys, flag);
432         fl6->fl6_sport = flkeys->ports.src;
433         fl6->fl6_dport = flkeys->ports.dst;
434         fl6->flowi6_proto = flkeys->basic.ip_proto;
435 
436         return true;
437 }
438 #else
439 static inline int               fib6_rules_init(void)
440 {
441         return 0;
442 }
443 static inline void              fib6_rules_cleanup(void)
444 {
445         return ;
446 }
447 static inline bool fib6_rule_default(const struct fib_rule *rule)
448 {
449         return true;
450 }
451 static inline int fib6_rules_dump(struct net *net, struct notifier_block *nb)
452 {
453         return 0;
454 }
455 static inline unsigned int fib6_rules_seq_read(struct net *net)
456 {
457         return 0;
458 }
459 static inline bool fib6_rules_early_flow_dissect(struct net *net,
460                                                  struct sk_buff *skb,
461                                                  struct flowi6 *fl6,
462                                                  struct flow_keys *flkeys)
463 {
464         return false;
465 }
466 #endif
467 #endif
468 

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