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 
24 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
25 #define FIB6_TABLE_HASHSZ 256
26 #else
27 #define FIB6_TABLE_HASHSZ 1
28 #endif
29 
30 #define RT6_DEBUG 2
31 
32 #if RT6_DEBUG >= 3
33 #define RT6_TRACE(x...) pr_debug(x)
34 #else
35 #define RT6_TRACE(x...) do { ; } while (0)
36 #endif
37 
38 struct rt6_info;
39 struct fib6_info;
40 
41 struct fib6_config {
42 	u32		fc_table;
43 	u32		fc_metric;
44 	int		fc_dst_len;
45 	int		fc_src_len;
46 	int		fc_ifindex;
47 	u32		fc_flags;
48 	u32		fc_protocol;
49 	u16		fc_type;        /* only 8 bits are used */
50 	u16		fc_delete_all_nh : 1,
51 			fc_ignore_dev_down:1,
52 			__unused : 14;
53 	u32		fc_nh_id;
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 	bool		fc_is_fdb;
70 };
71 
72 struct fib6_node {
73 	struct fib6_node __rcu	*parent;
74 	struct fib6_node __rcu	*left;
75 	struct fib6_node __rcu	*right;
76 #ifdef CONFIG_IPV6_SUBTREES
77 	struct fib6_node __rcu	*subtree;
78 #endif
79 	struct fib6_info __rcu	*leaf;
80 
81 	__u16			fn_bit;		/* bit key */
82 	__u16			fn_flags;
83 	int			fn_sernum;
84 	struct fib6_info __rcu	*rr_ptr;
85 	struct rcu_head		rcu;
86 };
87 
88 struct fib6_gc_args {
89 	int			timeout;
90 	int			more;
91 };
92 
93 #ifndef CONFIG_IPV6_SUBTREES
94 #define FIB6_SUBTREE(fn)	NULL
95 
fib6_routes_require_src(const struct net * net)96 static inline bool fib6_routes_require_src(const struct net *net)
97 {
98 	return false;
99 }
100 
fib6_routes_require_src_inc(struct net * net)101 static inline void fib6_routes_require_src_inc(struct net *net) {}
fib6_routes_require_src_dec(struct net * net)102 static inline void fib6_routes_require_src_dec(struct net *net) {}
103 
104 #else
105 
fib6_routes_require_src(const struct net * net)106 static inline bool fib6_routes_require_src(const struct net *net)
107 {
108 	return net->ipv6.fib6_routes_require_src > 0;
109 }
110 
fib6_routes_require_src_inc(struct net * net)111 static inline void fib6_routes_require_src_inc(struct net *net)
112 {
113 	net->ipv6.fib6_routes_require_src++;
114 }
115 
fib6_routes_require_src_dec(struct net * net)116 static inline void fib6_routes_require_src_dec(struct net *net)
117 {
118 	net->ipv6.fib6_routes_require_src--;
119 }
120 
121 #define FIB6_SUBTREE(fn)	(rcu_dereference_protected((fn)->subtree, 1))
122 #endif
123 
124 /*
125  *	routing information
126  *
127  */
128 
129 struct rt6key {
130 	struct in6_addr	addr;
131 	int		plen;
132 };
133 
134 struct fib6_table;
135 
136 struct rt6_exception_bucket {
137 	struct hlist_head	chain;
138 	int			depth;
139 };
140 
141 struct rt6_exception {
142 	struct hlist_node	hlist;
143 	struct rt6_info		*rt6i;
144 	unsigned long		stamp;
145 	struct rcu_head		rcu;
146 };
147 
148 #define FIB6_EXCEPTION_BUCKET_SIZE_SHIFT 10
149 #define FIB6_EXCEPTION_BUCKET_SIZE (1 << FIB6_EXCEPTION_BUCKET_SIZE_SHIFT)
150 #define FIB6_MAX_DEPTH 5
151 
152 struct fib6_nh {
153 	struct fib_nh_common	nh_common;
154 
155 #ifdef CONFIG_IPV6_ROUTER_PREF
156 	unsigned long		last_probe;
157 #endif
158 
159 	struct rt6_info * __percpu *rt6i_pcpu;
160 	struct rt6_exception_bucket __rcu *rt6i_exception_bucket;
161 };
162 
163 struct fib6_info {
164 	struct fib6_table		*fib6_table;
165 	struct fib6_info __rcu		*fib6_next;
166 	struct fib6_node __rcu		*fib6_node;
167 
168 	/* Multipath routes:
169 	 * siblings is a list of fib6_info that have the same metric/weight,
170 	 * destination, but not the same gateway. nsiblings is just a cache
171 	 * to speed up lookup.
172 	 */
173 	union {
174 		struct list_head	fib6_siblings;
175 		struct list_head	nh_list;
176 	};
177 	unsigned int			fib6_nsiblings;
178 
179 	refcount_t			fib6_ref;
180 	unsigned long			expires;
181 	struct dst_metrics		*fib6_metrics;
182 #define fib6_pmtu		fib6_metrics->metrics[RTAX_MTU-1]
183 
184 	struct rt6key			fib6_dst;
185 	u32				fib6_flags;
186 	struct rt6key			fib6_src;
187 	struct rt6key			fib6_prefsrc;
188 
189 	u32				fib6_metric;
190 	u8				fib6_protocol;
191 	u8				fib6_type;
192 	u8				should_flush:1,
193 					dst_nocount:1,
194 					dst_nopolicy:1,
195 					fib6_destroying:1,
196 					offload:1,
197 					trap:1,
198 					offload_failed:1,
199 					unused:1;
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 	struct list_head		rt6i_uncached;
218 	struct uncached_list		*rt6i_uncached_list;
219 
220 	/* more non-fragment space at head required */
221 	unsigned short			rt6i_nfheader_len;
222 };
223 
224 struct fib6_result {
225 	struct fib6_nh		*nh;
226 	struct fib6_info	*f6i;
227 	u32			fib6_flags;
228 	u8			fib6_type;
229 	struct rt6_info		*rt6;
230 };
231 
232 #define for_each_fib6_node_rt_rcu(fn)					\
233 	for (rt = rcu_dereference((fn)->leaf); rt;			\
234 	     rt = rcu_dereference(rt->fib6_next))
235 
236 #define for_each_fib6_walker_rt(w)					\
237 	for (rt = (w)->leaf; rt;					\
238 	     rt = rcu_dereference_protected(rt->fib6_next, 1))
239 
ip6_dst_idev(struct dst_entry * dst)240 static inline struct inet6_dev *ip6_dst_idev(struct dst_entry *dst)
241 {
242 	return ((struct rt6_info *)dst)->rt6i_idev;
243 }
244 
fib6_requires_src(const struct fib6_info * rt)245 static inline bool fib6_requires_src(const struct fib6_info *rt)
246 {
247 	return rt->fib6_src.plen > 0;
248 }
249 
fib6_clean_expires(struct fib6_info * f6i)250 static inline void fib6_clean_expires(struct fib6_info *f6i)
251 {
252 	f6i->fib6_flags &= ~RTF_EXPIRES;
253 	f6i->expires = 0;
254 }
255 
fib6_set_expires(struct fib6_info * f6i,unsigned long expires)256 static inline void fib6_set_expires(struct fib6_info *f6i,
257 				    unsigned long expires)
258 {
259 	f6i->expires = expires;
260 	f6i->fib6_flags |= RTF_EXPIRES;
261 }
262 
fib6_check_expired(const struct fib6_info * f6i)263 static inline bool fib6_check_expired(const struct fib6_info *f6i)
264 {
265 	if (f6i->fib6_flags & RTF_EXPIRES)
266 		return time_after(jiffies, f6i->expires);
267 	return false;
268 }
269 
270 /* Function to safely get fn->fn_sernum for passed in rt
271  * and store result in passed in cookie.
272  * Return true if we can get cookie safely
273  * Return false if not
274  */
fib6_get_cookie_safe(const struct fib6_info * f6i,u32 * cookie)275 static inline bool fib6_get_cookie_safe(const struct fib6_info *f6i,
276 					u32 *cookie)
277 {
278 	struct fib6_node *fn;
279 	bool status = false;
280 
281 	fn = rcu_dereference(f6i->fib6_node);
282 
283 	if (fn) {
284 		*cookie = fn->fn_sernum;
285 		/* pairs with smp_wmb() in __fib6_update_sernum_upto_root() */
286 		smp_rmb();
287 		status = true;
288 	}
289 
290 	return status;
291 }
292 
rt6_get_cookie(const struct rt6_info * rt)293 static inline u32 rt6_get_cookie(const struct rt6_info *rt)
294 {
295 	struct fib6_info *from;
296 	u32 cookie = 0;
297 
298 	if (rt->sernum)
299 		return rt->sernum;
300 
301 	rcu_read_lock();
302 
303 	from = rcu_dereference(rt->from);
304 	if (from)
305 		fib6_get_cookie_safe(from, &cookie);
306 
307 	rcu_read_unlock();
308 
309 	return cookie;
310 }
311 
ip6_rt_put(struct rt6_info * rt)312 static inline void ip6_rt_put(struct rt6_info *rt)
313 {
314 	/* dst_release() accepts a NULL parameter.
315 	 * We rely on dst being first structure in struct rt6_info
316 	 */
317 	BUILD_BUG_ON(offsetof(struct rt6_info, dst) != 0);
318 	dst_release(&rt->dst);
319 }
320 
321 struct fib6_info *fib6_info_alloc(gfp_t gfp_flags, bool with_fib6_nh);
322 void fib6_info_destroy_rcu(struct rcu_head *head);
323 
fib6_info_hold(struct fib6_info * f6i)324 static inline void fib6_info_hold(struct fib6_info *f6i)
325 {
326 	refcount_inc(&f6i->fib6_ref);
327 }
328 
fib6_info_hold_safe(struct fib6_info * f6i)329 static inline bool fib6_info_hold_safe(struct fib6_info *f6i)
330 {
331 	return refcount_inc_not_zero(&f6i->fib6_ref);
332 }
333 
fib6_info_release(struct fib6_info * f6i)334 static inline void fib6_info_release(struct fib6_info *f6i)
335 {
336 	if (f6i && refcount_dec_and_test(&f6i->fib6_ref))
337 		call_rcu(&f6i->rcu, fib6_info_destroy_rcu);
338 }
339 
340 enum fib6_walk_state {
341 #ifdef CONFIG_IPV6_SUBTREES
342 	FWS_S,
343 #endif
344 	FWS_L,
345 	FWS_R,
346 	FWS_C,
347 	FWS_U
348 };
349 
350 struct fib6_walker {
351 	struct list_head lh;
352 	struct fib6_node *root, *node;
353 	struct fib6_info *leaf;
354 	enum fib6_walk_state state;
355 	unsigned int skip;
356 	unsigned int count;
357 	unsigned int skip_in_node;
358 	int (*func)(struct fib6_walker *);
359 	void *args;
360 };
361 
362 struct rt6_statistics {
363 	__u32		fib_nodes;		/* all fib6 nodes */
364 	__u32		fib_route_nodes;	/* intermediate nodes */
365 	__u32		fib_rt_entries;		/* rt entries in fib table */
366 	__u32		fib_rt_cache;		/* cached rt entries in exception table */
367 	__u32		fib_discarded_routes;	/* total number of routes delete */
368 
369 	/* The following stats are not protected by any lock */
370 	atomic_t	fib_rt_alloc;		/* total number of routes alloced */
371 	atomic_t	fib_rt_uncache;		/* rt entries in uncached list */
372 };
373 
374 #define RTN_TL_ROOT	0x0001
375 #define RTN_ROOT	0x0002		/* tree root node		*/
376 #define RTN_RTINFO	0x0004		/* node with valid routing info	*/
377 
378 /*
379  *	priority levels (or metrics)
380  *
381  */
382 
383 
384 struct fib6_table {
385 	struct hlist_node	tb6_hlist;
386 	u32			tb6_id;
387 	spinlock_t		tb6_lock;
388 	struct fib6_node	tb6_root;
389 	struct inet_peer_base	tb6_peers;
390 	unsigned int		flags;
391 	unsigned int		fib_seq;
392 #define RT6_TABLE_HAS_DFLT_ROUTER	BIT(0)
393 };
394 
395 #define RT6_TABLE_UNSPEC	RT_TABLE_UNSPEC
396 #define RT6_TABLE_MAIN		RT_TABLE_MAIN
397 #define RT6_TABLE_DFLT		RT6_TABLE_MAIN
398 #define RT6_TABLE_INFO		RT6_TABLE_MAIN
399 #define RT6_TABLE_PREFIX	RT6_TABLE_MAIN
400 
401 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
402 #define FIB6_TABLE_MIN		1
403 #define FIB6_TABLE_MAX		RT_TABLE_MAX
404 #define RT6_TABLE_LOCAL		RT_TABLE_LOCAL
405 #else
406 #define FIB6_TABLE_MIN		RT_TABLE_MAIN
407 #define FIB6_TABLE_MAX		FIB6_TABLE_MIN
408 #define RT6_TABLE_LOCAL		RT6_TABLE_MAIN
409 #endif
410 
411 typedef struct rt6_info *(*pol_lookup_t)(struct net *,
412 					 struct fib6_table *,
413 					 struct flowi6 *,
414 					 const struct sk_buff *, int);
415 
416 struct fib6_entry_notifier_info {
417 	struct fib_notifier_info info; /* must be first */
418 	struct fib6_info *rt;
419 	unsigned int nsiblings;
420 };
421 
422 /*
423  *	exported functions
424  */
425 
426 struct fib6_table *fib6_get_table(struct net *net, u32 id);
427 struct fib6_table *fib6_new_table(struct net *net, u32 id);
428 struct dst_entry *fib6_rule_lookup(struct net *net, struct flowi6 *fl6,
429 				   const struct sk_buff *skb,
430 				   int flags, pol_lookup_t lookup);
431 
432 /* called with rcu lock held; can return error pointer
433  * caller needs to select path
434  */
435 int fib6_lookup(struct net *net, int oif, struct flowi6 *fl6,
436 		struct fib6_result *res, int flags);
437 
438 /* called with rcu lock held; caller needs to select path */
439 int fib6_table_lookup(struct net *net, struct fib6_table *table,
440 		      int oif, struct flowi6 *fl6, struct fib6_result *res,
441 		      int strict);
442 
443 void fib6_select_path(const struct net *net, struct fib6_result *res,
444 		      struct flowi6 *fl6, int oif, bool have_oif_match,
445 		      const struct sk_buff *skb, int strict);
446 struct fib6_node *fib6_node_lookup(struct fib6_node *root,
447 				   const struct in6_addr *daddr,
448 				   const struct in6_addr *saddr);
449 
450 struct fib6_node *fib6_locate(struct fib6_node *root,
451 			      const struct in6_addr *daddr, int dst_len,
452 			      const struct in6_addr *saddr, int src_len,
453 			      bool exact_match);
454 
455 void fib6_clean_all(struct net *net, int (*func)(struct fib6_info *, void *arg),
456 		    void *arg);
457 void fib6_clean_all_skip_notify(struct net *net,
458 				int (*func)(struct fib6_info *, void *arg),
459 				void *arg);
460 
461 int fib6_add(struct fib6_node *root, struct fib6_info *rt,
462 	     struct nl_info *info, struct netlink_ext_ack *extack);
463 int fib6_del(struct fib6_info *rt, struct nl_info *info);
464 
465 static inline
rt6_get_prefsrc(const struct rt6_info * rt,struct in6_addr * addr)466 void rt6_get_prefsrc(const struct rt6_info *rt, struct in6_addr *addr)
467 {
468 	const struct fib6_info *from;
469 
470 	rcu_read_lock();
471 
472 	from = rcu_dereference(rt->from);
473 	if (from) {
474 		*addr = from->fib6_prefsrc.addr;
475 	} else {
476 		struct in6_addr in6_zero = {};
477 
478 		*addr = in6_zero;
479 	}
480 
481 	rcu_read_unlock();
482 }
483 
484 int fib6_nh_init(struct net *net, struct fib6_nh *fib6_nh,
485 		 struct fib6_config *cfg, gfp_t gfp_flags,
486 		 struct netlink_ext_ack *extack);
487 void fib6_nh_release(struct fib6_nh *fib6_nh);
488 void fib6_nh_release_dsts(struct fib6_nh *fib6_nh);
489 
490 int call_fib6_entry_notifiers(struct net *net,
491 			      enum fib_event_type event_type,
492 			      struct fib6_info *rt,
493 			      struct netlink_ext_ack *extack);
494 int call_fib6_multipath_entry_notifiers(struct net *net,
495 					enum fib_event_type event_type,
496 					struct fib6_info *rt,
497 					unsigned int nsiblings,
498 					struct netlink_ext_ack *extack);
499 int call_fib6_entry_notifiers_replace(struct net *net, struct fib6_info *rt);
500 void fib6_rt_update(struct net *net, struct fib6_info *rt,
501 		    struct nl_info *info);
502 void inet6_rt_notify(int event, struct fib6_info *rt, struct nl_info *info,
503 		     unsigned int flags);
504 
505 void fib6_run_gc(unsigned long expires, struct net *net, bool force);
506 
507 void fib6_gc_cleanup(void);
508 
509 int fib6_init(void);
510 
511 struct ipv6_route_iter {
512 	struct seq_net_private p;
513 	struct fib6_walker w;
514 	loff_t skip;
515 	struct fib6_table *tbl;
516 	int sernum;
517 };
518 
519 extern const struct seq_operations ipv6_route_seq_ops;
520 
521 int call_fib6_notifier(struct notifier_block *nb,
522 		       enum fib_event_type event_type,
523 		       struct fib_notifier_info *info);
524 int call_fib6_notifiers(struct net *net, enum fib_event_type event_type,
525 			struct fib_notifier_info *info);
526 
527 int __net_init fib6_notifier_init(struct net *net);
528 void __net_exit fib6_notifier_exit(struct net *net);
529 
530 unsigned int fib6_tables_seq_read(struct net *net);
531 int fib6_tables_dump(struct net *net, struct notifier_block *nb,
532 		     struct netlink_ext_ack *extack);
533 
534 void fib6_update_sernum(struct net *net, struct fib6_info *rt);
535 void fib6_update_sernum_upto_root(struct net *net, struct fib6_info *rt);
536 void fib6_update_sernum_stub(struct net *net, struct fib6_info *f6i);
537 
538 void fib6_metric_set(struct fib6_info *f6i, int metric, u32 val);
fib6_metric_locked(struct fib6_info * f6i,int metric)539 static inline bool fib6_metric_locked(struct fib6_info *f6i, int metric)
540 {
541 	return !!(f6i->fib6_metrics->metrics[RTAX_LOCK - 1] & (1 << metric));
542 }
543 void fib6_info_hw_flags_set(struct net *net, struct fib6_info *f6i,
544 			    bool offload, bool trap, bool offload_failed);
545 
546 #if IS_BUILTIN(CONFIG_IPV6) && defined(CONFIG_BPF_SYSCALL)
547 struct bpf_iter__ipv6_route {
548 	__bpf_md_ptr(struct bpf_iter_meta *, meta);
549 	__bpf_md_ptr(struct fib6_info *, rt);
550 };
551 #endif
552 
553 INDIRECT_CALLABLE_DECLARE(struct rt6_info *ip6_pol_route_output(struct net *net,
554 					     struct fib6_table *table,
555 					     struct flowi6 *fl6,
556 					     const struct sk_buff *skb,
557 					     int flags));
558 INDIRECT_CALLABLE_DECLARE(struct rt6_info *ip6_pol_route_input(struct net *net,
559 					     struct fib6_table *table,
560 					     struct flowi6 *fl6,
561 					     const struct sk_buff *skb,
562 					     int flags));
563 INDIRECT_CALLABLE_DECLARE(struct rt6_info *__ip6_route_redirect(struct net *net,
564 					     struct fib6_table *table,
565 					     struct flowi6 *fl6,
566 					     const struct sk_buff *skb,
567 					     int flags));
568 INDIRECT_CALLABLE_DECLARE(struct rt6_info *ip6_pol_route_lookup(struct net *net,
569 					     struct fib6_table *table,
570 					     struct flowi6 *fl6,
571 					     const struct sk_buff *skb,
572 					     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)573 static inline struct rt6_info *pol_lookup_func(pol_lookup_t lookup,
574 						struct net *net,
575 						struct fib6_table *table,
576 						struct flowi6 *fl6,
577 						const struct sk_buff *skb,
578 						int flags)
579 {
580 	return INDIRECT_CALL_4(lookup,
581 			       ip6_pol_route_output,
582 			       ip6_pol_route_input,
583 			       ip6_pol_route_lookup,
584 			       __ip6_route_redirect,
585 			       net, table, fl6, skb, flags);
586 }
587 
588 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
fib6_has_custom_rules(const struct net * net)589 static inline bool fib6_has_custom_rules(const struct net *net)
590 {
591 	return net->ipv6.fib6_has_custom_rules;
592 }
593 
594 int fib6_rules_init(void);
595 void fib6_rules_cleanup(void);
596 bool fib6_rule_default(const struct fib_rule *rule);
597 int fib6_rules_dump(struct net *net, struct notifier_block *nb,
598 		    struct netlink_ext_ack *extack);
599 unsigned int fib6_rules_seq_read(struct net *net);
600 
fib6_rules_early_flow_dissect(struct net * net,struct sk_buff * skb,struct flowi6 * fl6,struct flow_keys * flkeys)601 static inline bool fib6_rules_early_flow_dissect(struct net *net,
602 						 struct sk_buff *skb,
603 						 struct flowi6 *fl6,
604 						 struct flow_keys *flkeys)
605 {
606 	unsigned int flag = FLOW_DISSECTOR_F_STOP_AT_ENCAP;
607 
608 	if (!net->ipv6.fib6_rules_require_fldissect)
609 		return false;
610 
611 	skb_flow_dissect_flow_keys(skb, flkeys, flag);
612 	fl6->fl6_sport = flkeys->ports.src;
613 	fl6->fl6_dport = flkeys->ports.dst;
614 	fl6->flowi6_proto = flkeys->basic.ip_proto;
615 
616 	return true;
617 }
618 #else
fib6_has_custom_rules(const struct net * net)619 static inline bool fib6_has_custom_rules(const struct net *net)
620 {
621 	return false;
622 }
fib6_rules_init(void)623 static inline int               fib6_rules_init(void)
624 {
625 	return 0;
626 }
fib6_rules_cleanup(void)627 static inline void              fib6_rules_cleanup(void)
628 {
629 	return ;
630 }
fib6_rule_default(const struct fib_rule * rule)631 static inline bool fib6_rule_default(const struct fib_rule *rule)
632 {
633 	return true;
634 }
fib6_rules_dump(struct net * net,struct notifier_block * nb,struct netlink_ext_ack * extack)635 static inline int fib6_rules_dump(struct net *net, struct notifier_block *nb,
636 				  struct netlink_ext_ack *extack)
637 {
638 	return 0;
639 }
fib6_rules_seq_read(struct net * net)640 static inline unsigned int fib6_rules_seq_read(struct net *net)
641 {
642 	return 0;
643 }
fib6_rules_early_flow_dissect(struct net * net,struct sk_buff * skb,struct flowi6 * fl6,struct flow_keys * flkeys)644 static inline bool fib6_rules_early_flow_dissect(struct net *net,
645 						 struct sk_buff *skb,
646 						 struct flowi6 *fl6,
647 						 struct flow_keys *flkeys)
648 {
649 	return false;
650 }
651 #endif
652 #endif
653