xref: /linux/include/net/ip6_fib.h (revision e8dfd42c)
1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /*
3  *	Linux INET6 implementation
4  *
5  *	Authors:
6  *	Pedro Roque		<roque@di.fc.ul.pt>
7  */
8 
9 #ifndef _IP6_FIB_H
10 #define _IP6_FIB_H
11 
12 #include <linux/ipv6_route.h>
13 #include <linux/rtnetlink.h>
14 #include <linux/spinlock.h>
15 #include <linux/notifier.h>
16 #include <net/dst.h>
17 #include <net/flow.h>
18 #include <net/ip_fib.h>
19 #include <net/netlink.h>
20 #include <net/inetpeer.h>
21 #include <net/fib_notifier.h>
22 #include <linux/indirect_call_wrapper.h>
23 #include <uapi/linux/bpf.h>
24 
25 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
26 #define FIB6_TABLE_HASHSZ 256
27 #else
28 #define FIB6_TABLE_HASHSZ 1
29 #endif
30 
31 #define RT6_DEBUG 2
32 
33 struct rt6_info;
34 struct fib6_info;
35 
36 struct fib6_config {
37 	u32		fc_table;
38 	u32		fc_metric;
39 	int		fc_dst_len;
40 	int		fc_src_len;
41 	int		fc_ifindex;
42 	u32		fc_flags;
43 	u32		fc_protocol;
44 	u16		fc_type;        /* only 8 bits are used */
45 	u16		fc_delete_all_nh : 1,
46 			fc_ignore_dev_down:1,
47 			__unused : 14;
48 	u32		fc_nh_id;
49 
50 	struct in6_addr	fc_dst;
51 	struct in6_addr	fc_src;
52 	struct in6_addr	fc_prefsrc;
53 	struct in6_addr	fc_gateway;
54 
55 	unsigned long	fc_expires;
56 	struct nlattr	*fc_mx;
57 	int		fc_mx_len;
58 	int		fc_mp_len;
59 	struct nlattr	*fc_mp;
60 
61 	struct nl_info	fc_nlinfo;
62 	struct nlattr	*fc_encap;
63 	u16		fc_encap_type;
64 	bool		fc_is_fdb;
65 };
66 
67 struct fib6_node {
68 	struct fib6_node __rcu	*parent;
69 	struct fib6_node __rcu	*left;
70 	struct fib6_node __rcu	*right;
71 #ifdef CONFIG_IPV6_SUBTREES
72 	struct fib6_node __rcu	*subtree;
73 #endif
74 	struct fib6_info __rcu	*leaf;
75 
76 	__u16			fn_bit;		/* bit key */
77 	__u16			fn_flags;
78 	int			fn_sernum;
79 	struct fib6_info __rcu	*rr_ptr;
80 	struct rcu_head		rcu;
81 };
82 
83 struct fib6_gc_args {
84 	int			timeout;
85 	int			more;
86 };
87 
88 #ifndef CONFIG_IPV6_SUBTREES
89 #define FIB6_SUBTREE(fn)	NULL
90 
fib6_routes_require_src(const struct net * net)91 static inline bool fib6_routes_require_src(const struct net *net)
92 {
93 	return false;
94 }
95 
fib6_routes_require_src_inc(struct net * net)96 static inline void fib6_routes_require_src_inc(struct net *net) {}
fib6_routes_require_src_dec(struct net * net)97 static inline void fib6_routes_require_src_dec(struct net *net) {}
98 
99 #else
100 
fib6_routes_require_src(const struct net * net)101 static inline bool fib6_routes_require_src(const struct net *net)
102 {
103 	return net->ipv6.fib6_routes_require_src > 0;
104 }
105 
fib6_routes_require_src_inc(struct net * net)106 static inline void fib6_routes_require_src_inc(struct net *net)
107 {
108 	net->ipv6.fib6_routes_require_src++;
109 }
110 
fib6_routes_require_src_dec(struct net * net)111 static inline void fib6_routes_require_src_dec(struct net *net)
112 {
113 	net->ipv6.fib6_routes_require_src--;
114 }
115 
116 #define FIB6_SUBTREE(fn)	(rcu_dereference_protected((fn)->subtree, 1))
117 #endif
118 
119 /*
120  *	routing information
121  *
122  */
123 
124 struct rt6key {
125 	struct in6_addr	addr;
126 	int		plen;
127 };
128 
129 struct fib6_table;
130 
131 struct rt6_exception_bucket {
132 	struct hlist_head	chain;
133 	int			depth;
134 };
135 
136 struct rt6_exception {
137 	struct hlist_node	hlist;
138 	struct rt6_info		*rt6i;
139 	unsigned long		stamp;
140 	struct rcu_head		rcu;
141 };
142 
143 #define FIB6_EXCEPTION_BUCKET_SIZE_SHIFT 10
144 #define FIB6_EXCEPTION_BUCKET_SIZE (1 << FIB6_EXCEPTION_BUCKET_SIZE_SHIFT)
145 #define FIB6_MAX_DEPTH 5
146 
147 struct fib6_nh {
148 	struct fib_nh_common	nh_common;
149 
150 #ifdef CONFIG_IPV6_ROUTER_PREF
151 	unsigned long		last_probe;
152 #endif
153 
154 	struct rt6_info * __percpu *rt6i_pcpu;
155 	struct rt6_exception_bucket __rcu *rt6i_exception_bucket;
156 };
157 
158 struct fib6_info {
159 	struct fib6_table		*fib6_table;
160 	struct fib6_info __rcu		*fib6_next;
161 	struct fib6_node __rcu		*fib6_node;
162 
163 	/* Multipath routes:
164 	 * siblings is a list of fib6_info that have the same metric/weight,
165 	 * destination, but not the same gateway. nsiblings is just a cache
166 	 * to speed up lookup.
167 	 */
168 	union {
169 		struct list_head	fib6_siblings;
170 		struct list_head	nh_list;
171 	};
172 	unsigned int			fib6_nsiblings;
173 
174 	refcount_t			fib6_ref;
175 	unsigned long			expires;
176 
177 	struct hlist_node		gc_link;
178 
179 	struct dst_metrics		*fib6_metrics;
180 #define fib6_pmtu		fib6_metrics->metrics[RTAX_MTU-1]
181 
182 	struct rt6key			fib6_dst;
183 	u32				fib6_flags;
184 	struct rt6key			fib6_src;
185 	struct rt6key			fib6_prefsrc;
186 
187 	u32				fib6_metric;
188 	u8				fib6_protocol;
189 	u8				fib6_type;
190 
191 	u8				offload;
192 	u8				trap;
193 	u8				offload_failed;
194 
195 	u8				should_flush:1,
196 					dst_nocount:1,
197 					dst_nopolicy:1,
198 					fib6_destroying:1,
199 					unused:4;
200 
201 	struct rcu_head			rcu;
202 	struct nexthop			*nh;
203 	struct fib6_nh			fib6_nh[];
204 };
205 
206 struct rt6_info {
207 	struct dst_entry		dst;
208 	struct fib6_info __rcu		*from;
209 	int				sernum;
210 
211 	struct rt6key			rt6i_dst;
212 	struct rt6key			rt6i_src;
213 	struct in6_addr			rt6i_gateway;
214 	struct inet6_dev		*rt6i_idev;
215 	u32				rt6i_flags;
216 
217 	/* more non-fragment space at head required */
218 	unsigned short			rt6i_nfheader_len;
219 };
220 
221 struct fib6_result {
222 	struct fib6_nh		*nh;
223 	struct fib6_info	*f6i;
224 	u32			fib6_flags;
225 	u8			fib6_type;
226 	struct rt6_info		*rt6;
227 };
228 
229 #define for_each_fib6_node_rt_rcu(fn)					\
230 	for (rt = rcu_dereference((fn)->leaf); rt;			\
231 	     rt = rcu_dereference(rt->fib6_next))
232 
233 #define for_each_fib6_walker_rt(w)					\
234 	for (rt = (w)->leaf; rt;					\
235 	     rt = rcu_dereference_protected(rt->fib6_next, 1))
236 
237 #define dst_rt6_info(_ptr) container_of_const(_ptr, struct rt6_info, dst)
238 
ip6_dst_idev(const struct dst_entry * dst)239 static inline struct inet6_dev *ip6_dst_idev(const struct dst_entry *dst)
240 {
241 	return dst_rt6_info(dst)->rt6i_idev;
242 }
243 
fib6_requires_src(const struct fib6_info * rt)244 static inline bool fib6_requires_src(const struct fib6_info *rt)
245 {
246 	return rt->fib6_src.plen > 0;
247 }
248 
249 /* The callers should hold f6i->fib6_table->tb6_lock if a route has ever
250  * been added to a table before.
251  */
fib6_clean_expires(struct fib6_info * f6i)252 static inline void fib6_clean_expires(struct fib6_info *f6i)
253 {
254 	f6i->fib6_flags &= ~RTF_EXPIRES;
255 	f6i->expires = 0;
256 }
257 
258 /* The callers should hold f6i->fib6_table->tb6_lock if a route has ever
259  * been added to a table before.
260  */
fib6_set_expires(struct fib6_info * f6i,unsigned long expires)261 static inline void fib6_set_expires(struct fib6_info *f6i,
262 				    unsigned long expires)
263 {
264 	f6i->expires = expires;
265 	f6i->fib6_flags |= RTF_EXPIRES;
266 }
267 
fib6_check_expired(const struct fib6_info * f6i)268 static inline bool fib6_check_expired(const struct fib6_info *f6i)
269 {
270 	if (f6i->fib6_flags & RTF_EXPIRES)
271 		return time_after(jiffies, f6i->expires);
272 	return false;
273 }
274 
275 /* Function to safely get fn->fn_sernum for passed in rt
276  * and store result in passed in cookie.
277  * Return true if we can get cookie safely
278  * Return false if not
279  */
fib6_get_cookie_safe(const struct fib6_info * f6i,u32 * cookie)280 static inline bool fib6_get_cookie_safe(const struct fib6_info *f6i,
281 					u32 *cookie)
282 {
283 	struct fib6_node *fn;
284 	bool status = false;
285 
286 	fn = rcu_dereference(f6i->fib6_node);
287 
288 	if (fn) {
289 		*cookie = READ_ONCE(fn->fn_sernum);
290 		/* pairs with smp_wmb() in __fib6_update_sernum_upto_root() */
291 		smp_rmb();
292 		status = true;
293 	}
294 
295 	return status;
296 }
297 
rt6_get_cookie(const struct rt6_info * rt)298 static inline u32 rt6_get_cookie(const struct rt6_info *rt)
299 {
300 	struct fib6_info *from;
301 	u32 cookie = 0;
302 
303 	if (rt->sernum)
304 		return rt->sernum;
305 
306 	rcu_read_lock();
307 
308 	from = rcu_dereference(rt->from);
309 	if (from)
310 		fib6_get_cookie_safe(from, &cookie);
311 
312 	rcu_read_unlock();
313 
314 	return cookie;
315 }
316 
ip6_rt_put(struct rt6_info * rt)317 static inline void ip6_rt_put(struct rt6_info *rt)
318 {
319 	/* dst_release() accepts a NULL parameter.
320 	 * We rely on dst being first structure in struct rt6_info
321 	 */
322 	BUILD_BUG_ON(offsetof(struct rt6_info, dst) != 0);
323 	dst_release(&rt->dst);
324 }
325 
326 struct fib6_info *fib6_info_alloc(gfp_t gfp_flags, bool with_fib6_nh);
327 void fib6_info_destroy_rcu(struct rcu_head *head);
328 
fib6_info_hold(struct fib6_info * f6i)329 static inline void fib6_info_hold(struct fib6_info *f6i)
330 {
331 	refcount_inc(&f6i->fib6_ref);
332 }
333 
fib6_info_hold_safe(struct fib6_info * f6i)334 static inline bool fib6_info_hold_safe(struct fib6_info *f6i)
335 {
336 	return refcount_inc_not_zero(&f6i->fib6_ref);
337 }
338 
fib6_info_release(struct fib6_info * f6i)339 static inline void fib6_info_release(struct fib6_info *f6i)
340 {
341 	if (f6i && refcount_dec_and_test(&f6i->fib6_ref)) {
342 		DEBUG_NET_WARN_ON_ONCE(!hlist_unhashed(&f6i->gc_link));
343 		call_rcu_hurry(&f6i->rcu, fib6_info_destroy_rcu);
344 	}
345 }
346 
347 enum fib6_walk_state {
348 #ifdef CONFIG_IPV6_SUBTREES
349 	FWS_S,
350 #endif
351 	FWS_L,
352 	FWS_R,
353 	FWS_C,
354 	FWS_U
355 };
356 
357 struct fib6_walker {
358 	struct list_head lh;
359 	struct fib6_node *root, *node;
360 	struct fib6_info *leaf;
361 	enum fib6_walk_state state;
362 	unsigned int skip;
363 	unsigned int count;
364 	unsigned int skip_in_node;
365 	int (*func)(struct fib6_walker *);
366 	void *args;
367 };
368 
369 struct rt6_statistics {
370 	__u32		fib_nodes;		/* all fib6 nodes */
371 	__u32		fib_route_nodes;	/* intermediate nodes */
372 	__u32		fib_rt_entries;		/* rt entries in fib table */
373 	__u32		fib_rt_cache;		/* cached rt entries in exception table */
374 	__u32		fib_discarded_routes;	/* total number of routes delete */
375 
376 	/* The following stat is not protected by any lock */
377 	atomic_t	fib_rt_alloc;		/* total number of routes alloced */
378 };
379 
380 #define RTN_TL_ROOT	0x0001
381 #define RTN_ROOT	0x0002		/* tree root node		*/
382 #define RTN_RTINFO	0x0004		/* node with valid routing info	*/
383 
384 /*
385  *	priority levels (or metrics)
386  *
387  */
388 
389 
390 struct fib6_table {
391 	struct hlist_node	tb6_hlist;
392 	u32			tb6_id;
393 	spinlock_t		tb6_lock;
394 	struct fib6_node	tb6_root;
395 	struct inet_peer_base	tb6_peers;
396 	unsigned int		flags;
397 	unsigned int		fib_seq;
398 	struct hlist_head       tb6_gc_hlist;	/* GC candidates */
399 #define RT6_TABLE_HAS_DFLT_ROUTER	BIT(0)
400 };
401 
402 #define RT6_TABLE_UNSPEC	RT_TABLE_UNSPEC
403 #define RT6_TABLE_MAIN		RT_TABLE_MAIN
404 #define RT6_TABLE_DFLT		RT6_TABLE_MAIN
405 #define RT6_TABLE_INFO		RT6_TABLE_MAIN
406 #define RT6_TABLE_PREFIX	RT6_TABLE_MAIN
407 
408 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
409 #define FIB6_TABLE_MIN		1
410 #define FIB6_TABLE_MAX		RT_TABLE_MAX
411 #define RT6_TABLE_LOCAL		RT_TABLE_LOCAL
412 #else
413 #define FIB6_TABLE_MIN		RT_TABLE_MAIN
414 #define FIB6_TABLE_MAX		FIB6_TABLE_MIN
415 #define RT6_TABLE_LOCAL		RT6_TABLE_MAIN
416 #endif
417 
418 typedef struct rt6_info *(*pol_lookup_t)(struct net *,
419 					 struct fib6_table *,
420 					 struct flowi6 *,
421 					 const struct sk_buff *, int);
422 
423 struct fib6_entry_notifier_info {
424 	struct fib_notifier_info info; /* must be first */
425 	struct fib6_info *rt;
426 	unsigned int nsiblings;
427 };
428 
429 /*
430  *	exported functions
431  */
432 
433 struct fib6_table *fib6_get_table(struct net *net, u32 id);
434 struct fib6_table *fib6_new_table(struct net *net, u32 id);
435 struct dst_entry *fib6_rule_lookup(struct net *net, struct flowi6 *fl6,
436 				   const struct sk_buff *skb,
437 				   int flags, pol_lookup_t lookup);
438 
439 /* called with rcu lock held; can return error pointer
440  * caller needs to select path
441  */
442 int fib6_lookup(struct net *net, int oif, struct flowi6 *fl6,
443 		struct fib6_result *res, int flags);
444 
445 /* called with rcu lock held; caller needs to select path */
446 int fib6_table_lookup(struct net *net, struct fib6_table *table,
447 		      int oif, struct flowi6 *fl6, struct fib6_result *res,
448 		      int strict);
449 
450 void fib6_select_path(const struct net *net, struct fib6_result *res,
451 		      struct flowi6 *fl6, int oif, bool have_oif_match,
452 		      const struct sk_buff *skb, int strict);
453 struct fib6_node *fib6_node_lookup(struct fib6_node *root,
454 				   const struct in6_addr *daddr,
455 				   const struct in6_addr *saddr);
456 
457 struct fib6_node *fib6_locate(struct fib6_node *root,
458 			      const struct in6_addr *daddr, int dst_len,
459 			      const struct in6_addr *saddr, int src_len,
460 			      bool exact_match);
461 
462 void fib6_clean_all(struct net *net, int (*func)(struct fib6_info *, void *arg),
463 		    void *arg);
464 void fib6_clean_all_skip_notify(struct net *net,
465 				int (*func)(struct fib6_info *, void *arg),
466 				void *arg);
467 
468 int fib6_add(struct fib6_node *root, struct fib6_info *rt,
469 	     struct nl_info *info, struct netlink_ext_ack *extack);
470 int fib6_del(struct fib6_info *rt, struct nl_info *info);
471 
472 static inline
rt6_get_prefsrc(const struct rt6_info * rt,struct in6_addr * addr)473 void rt6_get_prefsrc(const struct rt6_info *rt, struct in6_addr *addr)
474 {
475 	const struct fib6_info *from;
476 
477 	rcu_read_lock();
478 
479 	from = rcu_dereference(rt->from);
480 	if (from)
481 		*addr = from->fib6_prefsrc.addr;
482 	else
483 		*addr = in6addr_any;
484 
485 	rcu_read_unlock();
486 }
487 
488 int fib6_nh_init(struct net *net, struct fib6_nh *fib6_nh,
489 		 struct fib6_config *cfg, gfp_t gfp_flags,
490 		 struct netlink_ext_ack *extack);
491 void fib6_nh_release(struct fib6_nh *fib6_nh);
492 void fib6_nh_release_dsts(struct fib6_nh *fib6_nh);
493 
494 int call_fib6_entry_notifiers(struct net *net,
495 			      enum fib_event_type event_type,
496 			      struct fib6_info *rt,
497 			      struct netlink_ext_ack *extack);
498 int call_fib6_multipath_entry_notifiers(struct net *net,
499 					enum fib_event_type event_type,
500 					struct fib6_info *rt,
501 					unsigned int nsiblings,
502 					struct netlink_ext_ack *extack);
503 int call_fib6_entry_notifiers_replace(struct net *net, struct fib6_info *rt);
504 void fib6_rt_update(struct net *net, struct fib6_info *rt,
505 		    struct nl_info *info);
506 void inet6_rt_notify(int event, struct fib6_info *rt, struct nl_info *info,
507 		     unsigned int flags);
508 
509 void fib6_run_gc(unsigned long expires, struct net *net, bool force);
510 
511 void fib6_gc_cleanup(void);
512 
513 int fib6_init(void);
514 
515 /* Add the route to the gc list if it is not already there
516  *
517  * The callers should hold f6i->fib6_table->tb6_lock.
518  */
fib6_add_gc_list(struct fib6_info * f6i)519 static inline void fib6_add_gc_list(struct fib6_info *f6i)
520 {
521 	/* If fib6_node is null, the f6i is not in (or removed from) the
522 	 * table.
523 	 *
524 	 * There is a gap between finding the f6i from the table and
525 	 * calling this function without the protection of the tb6_lock.
526 	 * This check makes sure the f6i is not added to the gc list when
527 	 * it is not on the table.
528 	 */
529 	if (!rcu_dereference_protected(f6i->fib6_node,
530 				       lockdep_is_held(&f6i->fib6_table->tb6_lock)))
531 		return;
532 
533 	if (hlist_unhashed(&f6i->gc_link))
534 		hlist_add_head(&f6i->gc_link, &f6i->fib6_table->tb6_gc_hlist);
535 }
536 
537 /* Remove the route from the gc list if it is on the list.
538  *
539  * The callers should hold f6i->fib6_table->tb6_lock.
540  */
fib6_remove_gc_list(struct fib6_info * f6i)541 static inline void fib6_remove_gc_list(struct fib6_info *f6i)
542 {
543 	if (!hlist_unhashed(&f6i->gc_link))
544 		hlist_del_init(&f6i->gc_link);
545 }
546 
547 struct ipv6_route_iter {
548 	struct seq_net_private p;
549 	struct fib6_walker w;
550 	loff_t skip;
551 	struct fib6_table *tbl;
552 	int sernum;
553 };
554 
555 extern const struct seq_operations ipv6_route_seq_ops;
556 
557 int call_fib6_notifier(struct notifier_block *nb,
558 		       enum fib_event_type event_type,
559 		       struct fib_notifier_info *info);
560 int call_fib6_notifiers(struct net *net, enum fib_event_type event_type,
561 			struct fib_notifier_info *info);
562 
563 int __net_init fib6_notifier_init(struct net *net);
564 void __net_exit fib6_notifier_exit(struct net *net);
565 
566 unsigned int fib6_tables_seq_read(struct net *net);
567 int fib6_tables_dump(struct net *net, struct notifier_block *nb,
568 		     struct netlink_ext_ack *extack);
569 
570 void fib6_update_sernum(struct net *net, struct fib6_info *rt);
571 void fib6_update_sernum_upto_root(struct net *net, struct fib6_info *rt);
572 void fib6_update_sernum_stub(struct net *net, struct fib6_info *f6i);
573 
574 void fib6_metric_set(struct fib6_info *f6i, int metric, u32 val);
fib6_metric_locked(struct fib6_info * f6i,int metric)575 static inline bool fib6_metric_locked(struct fib6_info *f6i, int metric)
576 {
577 	return !!(f6i->fib6_metrics->metrics[RTAX_LOCK - 1] & (1 << metric));
578 }
579 void fib6_info_hw_flags_set(struct net *net, struct fib6_info *f6i,
580 			    bool offload, bool trap, bool offload_failed);
581 
582 #if IS_BUILTIN(CONFIG_IPV6) && defined(CONFIG_BPF_SYSCALL)
583 struct bpf_iter__ipv6_route {
584 	__bpf_md_ptr(struct bpf_iter_meta *, meta);
585 	__bpf_md_ptr(struct fib6_info *, rt);
586 };
587 #endif
588 
589 INDIRECT_CALLABLE_DECLARE(struct rt6_info *ip6_pol_route_output(struct net *net,
590 					     struct fib6_table *table,
591 					     struct flowi6 *fl6,
592 					     const struct sk_buff *skb,
593 					     int flags));
594 INDIRECT_CALLABLE_DECLARE(struct rt6_info *ip6_pol_route_input(struct net *net,
595 					     struct fib6_table *table,
596 					     struct flowi6 *fl6,
597 					     const struct sk_buff *skb,
598 					     int flags));
599 INDIRECT_CALLABLE_DECLARE(struct rt6_info *__ip6_route_redirect(struct net *net,
600 					     struct fib6_table *table,
601 					     struct flowi6 *fl6,
602 					     const struct sk_buff *skb,
603 					     int flags));
604 INDIRECT_CALLABLE_DECLARE(struct rt6_info *ip6_pol_route_lookup(struct net *net,
605 					     struct fib6_table *table,
606 					     struct flowi6 *fl6,
607 					     const struct sk_buff *skb,
608 					     int flags));
pol_lookup_func(pol_lookup_t lookup,struct net * net,struct fib6_table * table,struct flowi6 * fl6,const struct sk_buff * skb,int flags)609 static inline struct rt6_info *pol_lookup_func(pol_lookup_t lookup,
610 						struct net *net,
611 						struct fib6_table *table,
612 						struct flowi6 *fl6,
613 						const struct sk_buff *skb,
614 						int flags)
615 {
616 	return INDIRECT_CALL_4(lookup,
617 			       ip6_pol_route_output,
618 			       ip6_pol_route_input,
619 			       ip6_pol_route_lookup,
620 			       __ip6_route_redirect,
621 			       net, table, fl6, skb, flags);
622 }
623 
624 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
fib6_has_custom_rules(const struct net * net)625 static inline bool fib6_has_custom_rules(const struct net *net)
626 {
627 	return net->ipv6.fib6_has_custom_rules;
628 }
629 
630 int fib6_rules_init(void);
631 void fib6_rules_cleanup(void);
632 bool fib6_rule_default(const struct fib_rule *rule);
633 int fib6_rules_dump(struct net *net, struct notifier_block *nb,
634 		    struct netlink_ext_ack *extack);
635 unsigned int fib6_rules_seq_read(struct net *net);
636 
fib6_rules_early_flow_dissect(struct net * net,struct sk_buff * skb,struct flowi6 * fl6,struct flow_keys * flkeys)637 static inline bool fib6_rules_early_flow_dissect(struct net *net,
638 						 struct sk_buff *skb,
639 						 struct flowi6 *fl6,
640 						 struct flow_keys *flkeys)
641 {
642 	unsigned int flag = FLOW_DISSECTOR_F_STOP_AT_ENCAP;
643 
644 	if (!net->ipv6.fib6_rules_require_fldissect)
645 		return false;
646 
647 	memset(flkeys, 0, sizeof(*flkeys));
648 	__skb_flow_dissect(net, skb, &flow_keys_dissector,
649 			   flkeys, NULL, 0, 0, 0, flag);
650 
651 	fl6->fl6_sport = flkeys->ports.src;
652 	fl6->fl6_dport = flkeys->ports.dst;
653 	fl6->flowi6_proto = flkeys->basic.ip_proto;
654 
655 	return true;
656 }
657 #else
fib6_has_custom_rules(const struct net * net)658 static inline bool fib6_has_custom_rules(const struct net *net)
659 {
660 	return false;
661 }
fib6_rules_init(void)662 static inline int               fib6_rules_init(void)
663 {
664 	return 0;
665 }
fib6_rules_cleanup(void)666 static inline void              fib6_rules_cleanup(void)
667 {
668 	return ;
669 }
fib6_rule_default(const struct fib_rule * rule)670 static inline bool fib6_rule_default(const struct fib_rule *rule)
671 {
672 	return true;
673 }
fib6_rules_dump(struct net * net,struct notifier_block * nb,struct netlink_ext_ack * extack)674 static inline int fib6_rules_dump(struct net *net, struct notifier_block *nb,
675 				  struct netlink_ext_ack *extack)
676 {
677 	return 0;
678 }
fib6_rules_seq_read(struct net * net)679 static inline unsigned int fib6_rules_seq_read(struct net *net)
680 {
681 	return 0;
682 }
fib6_rules_early_flow_dissect(struct net * net,struct sk_buff * skb,struct flowi6 * fl6,struct flow_keys * flkeys)683 static inline bool fib6_rules_early_flow_dissect(struct net *net,
684 						 struct sk_buff *skb,
685 						 struct flowi6 *fl6,
686 						 struct flow_keys *flkeys)
687 {
688 	return false;
689 }
690 #endif
691 #endif
692