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 #if RT6_DEBUG >= 3
34 #define RT6_TRACE(x...) pr_debug(x)
35 #else
36 #define RT6_TRACE(x...) do { ; } while (0)
37 #endif
38 
39 struct rt6_info;
40 struct fib6_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 			fc_ignore_dev_down:1,
53 			__unused : 14;
54 	u32		fc_nh_id;
55 
56 	struct in6_addr	fc_dst;
57 	struct in6_addr	fc_src;
58 	struct in6_addr	fc_prefsrc;
59 	struct in6_addr	fc_gateway;
60 
61 	unsigned long	fc_expires;
62 	struct nlattr	*fc_mx;
63 	int		fc_mx_len;
64 	int		fc_mp_len;
65 	struct nlattr	*fc_mp;
66 
67 	struct nl_info	fc_nlinfo;
68 	struct nlattr	*fc_encap;
69 	u16		fc_encap_type;
70 	bool		fc_is_fdb;
71 };
72 
73 struct fib6_node {
74 	struct fib6_node __rcu	*parent;
75 	struct fib6_node __rcu	*left;
76 	struct fib6_node __rcu	*right;
77 #ifdef CONFIG_IPV6_SUBTREES
78 	struct fib6_node __rcu	*subtree;
79 #endif
80 	struct fib6_info __rcu	*leaf;
81 
82 	__u16			fn_bit;		/* bit key */
83 	__u16			fn_flags;
84 	int			fn_sernum;
85 	struct fib6_info __rcu	*rr_ptr;
86 	struct rcu_head		rcu;
87 };
88 
89 struct fib6_gc_args {
90 	int			timeout;
91 	int			more;
92 };
93 
94 #ifndef CONFIG_IPV6_SUBTREES
95 #define FIB6_SUBTREE(fn)	NULL
96 
fib6_routes_require_src(const struct net * net)97 static inline bool fib6_routes_require_src(const struct net *net)
98 {
99 	return false;
100 }
101 
fib6_routes_require_src_inc(struct net * net)102 static inline void fib6_routes_require_src_inc(struct net *net) {}
fib6_routes_require_src_dec(struct net * net)103 static inline void fib6_routes_require_src_dec(struct net *net) {}
104 
105 #else
106 
fib6_routes_require_src(const struct net * net)107 static inline bool fib6_routes_require_src(const struct net *net)
108 {
109 	return net->ipv6.fib6_routes_require_src > 0;
110 }
111 
fib6_routes_require_src_inc(struct net * net)112 static inline void fib6_routes_require_src_inc(struct net *net)
113 {
114 	net->ipv6.fib6_routes_require_src++;
115 }
116 
fib6_routes_require_src_dec(struct net * net)117 static inline void fib6_routes_require_src_dec(struct net *net)
118 {
119 	net->ipv6.fib6_routes_require_src--;
120 }
121 
122 #define FIB6_SUBTREE(fn)	(rcu_dereference_protected((fn)->subtree, 1))
123 #endif
124 
125 /*
126  *	routing information
127  *
128  */
129 
130 struct rt6key {
131 	struct in6_addr	addr;
132 	int		plen;
133 };
134 
135 struct fib6_table;
136 
137 struct rt6_exception_bucket {
138 	struct hlist_head	chain;
139 	int			depth;
140 };
141 
142 struct rt6_exception {
143 	struct hlist_node	hlist;
144 	struct rt6_info		*rt6i;
145 	unsigned long		stamp;
146 	struct rcu_head		rcu;
147 };
148 
149 #define FIB6_EXCEPTION_BUCKET_SIZE_SHIFT 10
150 #define FIB6_EXCEPTION_BUCKET_SIZE (1 << FIB6_EXCEPTION_BUCKET_SIZE_SHIFT)
151 #define FIB6_MAX_DEPTH 5
152 
153 struct fib6_nh {
154 	struct fib_nh_common	nh_common;
155 
156 #ifdef CONFIG_IPV6_ROUTER_PREF
157 	unsigned long		last_probe;
158 #endif
159 
160 	struct rt6_info * __percpu *rt6i_pcpu;
161 	struct rt6_exception_bucket __rcu *rt6i_exception_bucket;
162 };
163 
164 struct fib6_info {
165 	struct fib6_table		*fib6_table;
166 	struct fib6_info __rcu		*fib6_next;
167 	struct fib6_node __rcu		*fib6_node;
168 
169 	/* Multipath routes:
170 	 * siblings is a list of fib6_info that have the same metric/weight,
171 	 * destination, but not the same gateway. nsiblings is just a cache
172 	 * to speed up lookup.
173 	 */
174 	union {
175 		struct list_head	fib6_siblings;
176 		struct list_head	nh_list;
177 	};
178 	unsigned int			fib6_nsiblings;
179 
180 	refcount_t			fib6_ref;
181 	unsigned long			expires;
182 	struct dst_metrics		*fib6_metrics;
183 #define fib6_pmtu		fib6_metrics->metrics[RTAX_MTU-1]
184 
185 	struct rt6key			fib6_dst;
186 	u32				fib6_flags;
187 	struct rt6key			fib6_src;
188 	struct rt6key			fib6_prefsrc;
189 
190 	u32				fib6_metric;
191 	u8				fib6_protocol;
192 	u8				fib6_type;
193 
194 	u8				offload;
195 	u8				trap;
196 	u8				offload_failed;
197 
198 	u8				should_flush:1,
199 					dst_nocount:1,
200 					dst_nopolicy:1,
201 					fib6_destroying:1,
202 					unused:4;
203 
204 	struct rcu_head			rcu;
205 	struct nexthop			*nh;
206 	struct fib6_nh			fib6_nh[];
207 };
208 
209 struct rt6_info {
210 	struct dst_entry		dst;
211 	struct fib6_info __rcu		*from;
212 	int				sernum;
213 
214 	struct rt6key			rt6i_dst;
215 	struct rt6key			rt6i_src;
216 	struct in6_addr			rt6i_gateway;
217 	struct inet6_dev		*rt6i_idev;
218 	u32				rt6i_flags;
219 
220 	struct list_head		rt6i_uncached;
221 	struct uncached_list		*rt6i_uncached_list;
222 
223 	/* more non-fragment space at head required */
224 	unsigned short			rt6i_nfheader_len;
225 };
226 
227 struct fib6_result {
228 	struct fib6_nh		*nh;
229 	struct fib6_info	*f6i;
230 	u32			fib6_flags;
231 	u8			fib6_type;
232 	struct rt6_info		*rt6;
233 };
234 
235 #define for_each_fib6_node_rt_rcu(fn)					\
236 	for (rt = rcu_dereference((fn)->leaf); rt;			\
237 	     rt = rcu_dereference(rt->fib6_next))
238 
239 #define for_each_fib6_walker_rt(w)					\
240 	for (rt = (w)->leaf; rt;					\
241 	     rt = rcu_dereference_protected(rt->fib6_next, 1))
242 
ip6_dst_idev(struct dst_entry * dst)243 static inline struct inet6_dev *ip6_dst_idev(struct dst_entry *dst)
244 {
245 	return ((struct rt6_info *)dst)->rt6i_idev;
246 }
247 
fib6_requires_src(const struct fib6_info * rt)248 static inline bool fib6_requires_src(const struct fib6_info *rt)
249 {
250 	return rt->fib6_src.plen > 0;
251 }
252 
fib6_clean_expires(struct fib6_info * f6i)253 static inline void fib6_clean_expires(struct fib6_info *f6i)
254 {
255 	f6i->fib6_flags &= ~RTF_EXPIRES;
256 	f6i->expires = 0;
257 }
258 
fib6_set_expires(struct fib6_info * f6i,unsigned long expires)259 static inline void fib6_set_expires(struct fib6_info *f6i,
260 				    unsigned long expires)
261 {
262 	f6i->expires = expires;
263 	f6i->fib6_flags |= RTF_EXPIRES;
264 }
265 
fib6_check_expired(const struct fib6_info * f6i)266 static inline bool fib6_check_expired(const struct fib6_info *f6i)
267 {
268 	if (f6i->fib6_flags & RTF_EXPIRES)
269 		return time_after(jiffies, f6i->expires);
270 	return false;
271 }
272 
273 /* Function to safely get fn->fn_sernum for passed in rt
274  * and store result in passed in cookie.
275  * Return true if we can get cookie safely
276  * Return false if not
277  */
fib6_get_cookie_safe(const struct fib6_info * f6i,u32 * cookie)278 static inline bool fib6_get_cookie_safe(const struct fib6_info *f6i,
279 					u32 *cookie)
280 {
281 	struct fib6_node *fn;
282 	bool status = false;
283 
284 	fn = rcu_dereference(f6i->fib6_node);
285 
286 	if (fn) {
287 		*cookie = READ_ONCE(fn->fn_sernum);
288 		/* pairs with smp_wmb() in __fib6_update_sernum_upto_root() */
289 		smp_rmb();
290 		status = true;
291 	}
292 
293 	return status;
294 }
295 
rt6_get_cookie(const struct rt6_info * rt)296 static inline u32 rt6_get_cookie(const struct rt6_info *rt)
297 {
298 	struct fib6_info *from;
299 	u32 cookie = 0;
300 
301 	if (rt->sernum)
302 		return rt->sernum;
303 
304 	rcu_read_lock();
305 
306 	from = rcu_dereference(rt->from);
307 	if (from)
308 		fib6_get_cookie_safe(from, &cookie);
309 
310 	rcu_read_unlock();
311 
312 	return cookie;
313 }
314 
ip6_rt_put(struct rt6_info * rt)315 static inline void ip6_rt_put(struct rt6_info *rt)
316 {
317 	/* dst_release() accepts a NULL parameter.
318 	 * We rely on dst being first structure in struct rt6_info
319 	 */
320 	BUILD_BUG_ON(offsetof(struct rt6_info, dst) != 0);
321 	dst_release(&rt->dst);
322 }
323 
324 struct fib6_info *fib6_info_alloc(gfp_t gfp_flags, bool with_fib6_nh);
325 void fib6_info_destroy_rcu(struct rcu_head *head);
326 
fib6_info_hold(struct fib6_info * f6i)327 static inline void fib6_info_hold(struct fib6_info *f6i)
328 {
329 	refcount_inc(&f6i->fib6_ref);
330 }
331 
fib6_info_hold_safe(struct fib6_info * f6i)332 static inline bool fib6_info_hold_safe(struct fib6_info *f6i)
333 {
334 	return refcount_inc_not_zero(&f6i->fib6_ref);
335 }
336 
fib6_info_release(struct fib6_info * f6i)337 static inline void fib6_info_release(struct fib6_info *f6i)
338 {
339 	if (f6i && refcount_dec_and_test(&f6i->fib6_ref))
340 		call_rcu(&f6i->rcu, fib6_info_destroy_rcu);
341 }
342 
343 enum fib6_walk_state {
344 #ifdef CONFIG_IPV6_SUBTREES
345 	FWS_S,
346 #endif
347 	FWS_L,
348 	FWS_R,
349 	FWS_C,
350 	FWS_U
351 };
352 
353 struct fib6_walker {
354 	struct list_head lh;
355 	struct fib6_node *root, *node;
356 	struct fib6_info *leaf;
357 	enum fib6_walk_state state;
358 	unsigned int skip;
359 	unsigned int count;
360 	unsigned int skip_in_node;
361 	int (*func)(struct fib6_walker *);
362 	void *args;
363 };
364 
365 struct rt6_statistics {
366 	__u32		fib_nodes;		/* all fib6 nodes */
367 	__u32		fib_route_nodes;	/* intermediate nodes */
368 	__u32		fib_rt_entries;		/* rt entries in fib table */
369 	__u32		fib_rt_cache;		/* cached rt entries in exception table */
370 	__u32		fib_discarded_routes;	/* total number of routes delete */
371 
372 	/* The following stat is not protected by any lock */
373 	atomic_t	fib_rt_alloc;		/* total number of routes alloced */
374 };
375 
376 #define RTN_TL_ROOT	0x0001
377 #define RTN_ROOT	0x0002		/* tree root node		*/
378 #define RTN_RTINFO	0x0004		/* node with valid routing info	*/
379 
380 /*
381  *	priority levels (or metrics)
382  *
383  */
384 
385 
386 struct fib6_table {
387 	struct hlist_node	tb6_hlist;
388 	u32			tb6_id;
389 	spinlock_t		tb6_lock;
390 	struct fib6_node	tb6_root;
391 	struct inet_peer_base	tb6_peers;
392 	unsigned int		flags;
393 	unsigned int		fib_seq;
394 #define RT6_TABLE_HAS_DFLT_ROUTER	BIT(0)
395 };
396 
397 #define RT6_TABLE_UNSPEC	RT_TABLE_UNSPEC
398 #define RT6_TABLE_MAIN		RT_TABLE_MAIN
399 #define RT6_TABLE_DFLT		RT6_TABLE_MAIN
400 #define RT6_TABLE_INFO		RT6_TABLE_MAIN
401 #define RT6_TABLE_PREFIX	RT6_TABLE_MAIN
402 
403 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
404 #define FIB6_TABLE_MIN		1
405 #define FIB6_TABLE_MAX		RT_TABLE_MAX
406 #define RT6_TABLE_LOCAL		RT_TABLE_LOCAL
407 #else
408 #define FIB6_TABLE_MIN		RT_TABLE_MAIN
409 #define FIB6_TABLE_MAX		FIB6_TABLE_MIN
410 #define RT6_TABLE_LOCAL		RT6_TABLE_MAIN
411 #endif
412 
413 typedef struct rt6_info *(*pol_lookup_t)(struct net *,
414 					 struct fib6_table *,
415 					 struct flowi6 *,
416 					 const struct sk_buff *, int);
417 
418 struct fib6_entry_notifier_info {
419 	struct fib_notifier_info info; /* must be first */
420 	struct fib6_info *rt;
421 	unsigned int nsiblings;
422 };
423 
424 /*
425  *	exported functions
426  */
427 
428 struct fib6_table *fib6_get_table(struct net *net, u32 id);
429 struct fib6_table *fib6_new_table(struct net *net, u32 id);
430 struct dst_entry *fib6_rule_lookup(struct net *net, struct flowi6 *fl6,
431 				   const struct sk_buff *skb,
432 				   int flags, pol_lookup_t lookup);
433 
434 /* called with rcu lock held; can return error pointer
435  * caller needs to select path
436  */
437 int fib6_lookup(struct net *net, int oif, struct flowi6 *fl6,
438 		struct fib6_result *res, int flags);
439 
440 /* called with rcu lock held; caller needs to select path */
441 int fib6_table_lookup(struct net *net, struct fib6_table *table,
442 		      int oif, struct flowi6 *fl6, struct fib6_result *res,
443 		      int strict);
444 
445 void fib6_select_path(const struct net *net, struct fib6_result *res,
446 		      struct flowi6 *fl6, int oif, bool have_oif_match,
447 		      const struct sk_buff *skb, int strict);
448 struct fib6_node *fib6_node_lookup(struct fib6_node *root,
449 				   const struct in6_addr *daddr,
450 				   const struct in6_addr *saddr);
451 
452 struct fib6_node *fib6_locate(struct fib6_node *root,
453 			      const struct in6_addr *daddr, int dst_len,
454 			      const struct in6_addr *saddr, int src_len,
455 			      bool exact_match);
456 
457 void fib6_clean_all(struct net *net, int (*func)(struct fib6_info *, void *arg),
458 		    void *arg);
459 void fib6_clean_all_skip_notify(struct net *net,
460 				int (*func)(struct fib6_info *, void *arg),
461 				void *arg);
462 
463 int fib6_add(struct fib6_node *root, struct fib6_info *rt,
464 	     struct nl_info *info, struct netlink_ext_ack *extack);
465 int fib6_del(struct fib6_info *rt, struct nl_info *info);
466 
467 static inline
rt6_get_prefsrc(const struct rt6_info * rt,struct in6_addr * addr)468 void rt6_get_prefsrc(const struct rt6_info *rt, struct in6_addr *addr)
469 {
470 	const struct fib6_info *from;
471 
472 	rcu_read_lock();
473 
474 	from = rcu_dereference(rt->from);
475 	if (from) {
476 		*addr = from->fib6_prefsrc.addr;
477 	} else {
478 		struct in6_addr in6_zero = {};
479 
480 		*addr = in6_zero;
481 	}
482 
483 	rcu_read_unlock();
484 }
485 
486 int fib6_nh_init(struct net *net, struct fib6_nh *fib6_nh,
487 		 struct fib6_config *cfg, gfp_t gfp_flags,
488 		 struct netlink_ext_ack *extack);
489 void fib6_nh_release(struct fib6_nh *fib6_nh);
490 void fib6_nh_release_dsts(struct fib6_nh *fib6_nh);
491 
492 int call_fib6_entry_notifiers(struct net *net,
493 			      enum fib_event_type event_type,
494 			      struct fib6_info *rt,
495 			      struct netlink_ext_ack *extack);
496 int call_fib6_multipath_entry_notifiers(struct net *net,
497 					enum fib_event_type event_type,
498 					struct fib6_info *rt,
499 					unsigned int nsiblings,
500 					struct netlink_ext_ack *extack);
501 int call_fib6_entry_notifiers_replace(struct net *net, struct fib6_info *rt);
502 void fib6_rt_update(struct net *net, struct fib6_info *rt,
503 		    struct nl_info *info);
504 void inet6_rt_notify(int event, struct fib6_info *rt, struct nl_info *info,
505 		     unsigned int flags);
506 
507 void fib6_run_gc(unsigned long expires, struct net *net, bool force);
508 
509 void fib6_gc_cleanup(void);
510 
511 int fib6_init(void);
512 
513 struct ipv6_route_iter {
514 	struct seq_net_private p;
515 	struct fib6_walker w;
516 	loff_t skip;
517 	struct fib6_table *tbl;
518 	int sernum;
519 };
520 
521 extern const struct seq_operations ipv6_route_seq_ops;
522 
523 int call_fib6_notifier(struct notifier_block *nb,
524 		       enum fib_event_type event_type,
525 		       struct fib_notifier_info *info);
526 int call_fib6_notifiers(struct net *net, enum fib_event_type event_type,
527 			struct fib_notifier_info *info);
528 
529 int __net_init fib6_notifier_init(struct net *net);
530 void __net_exit fib6_notifier_exit(struct net *net);
531 
532 unsigned int fib6_tables_seq_read(struct net *net);
533 int fib6_tables_dump(struct net *net, struct notifier_block *nb,
534 		     struct netlink_ext_ack *extack);
535 
536 void fib6_update_sernum(struct net *net, struct fib6_info *rt);
537 void fib6_update_sernum_upto_root(struct net *net, struct fib6_info *rt);
538 void fib6_update_sernum_stub(struct net *net, struct fib6_info *f6i);
539 
540 void fib6_metric_set(struct fib6_info *f6i, int metric, u32 val);
fib6_metric_locked(struct fib6_info * f6i,int metric)541 static inline bool fib6_metric_locked(struct fib6_info *f6i, int metric)
542 {
543 	return !!(f6i->fib6_metrics->metrics[RTAX_LOCK - 1] & (1 << metric));
544 }
545 void fib6_info_hw_flags_set(struct net *net, struct fib6_info *f6i,
546 			    bool offload, bool trap, bool offload_failed);
547 
548 #if IS_BUILTIN(CONFIG_IPV6) && defined(CONFIG_BPF_SYSCALL)
549 struct bpf_iter__ipv6_route {
550 	__bpf_md_ptr(struct bpf_iter_meta *, meta);
551 	__bpf_md_ptr(struct fib6_info *, rt);
552 };
553 #endif
554 
555 INDIRECT_CALLABLE_DECLARE(struct rt6_info *ip6_pol_route_output(struct net *net,
556 					     struct fib6_table *table,
557 					     struct flowi6 *fl6,
558 					     const struct sk_buff *skb,
559 					     int flags));
560 INDIRECT_CALLABLE_DECLARE(struct rt6_info *ip6_pol_route_input(struct net *net,
561 					     struct fib6_table *table,
562 					     struct flowi6 *fl6,
563 					     const struct sk_buff *skb,
564 					     int flags));
565 INDIRECT_CALLABLE_DECLARE(struct rt6_info *__ip6_route_redirect(struct net *net,
566 					     struct fib6_table *table,
567 					     struct flowi6 *fl6,
568 					     const struct sk_buff *skb,
569 					     int flags));
570 INDIRECT_CALLABLE_DECLARE(struct rt6_info *ip6_pol_route_lookup(struct net *net,
571 					     struct fib6_table *table,
572 					     struct flowi6 *fl6,
573 					     const struct sk_buff *skb,
574 					     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)575 static inline struct rt6_info *pol_lookup_func(pol_lookup_t lookup,
576 						struct net *net,
577 						struct fib6_table *table,
578 						struct flowi6 *fl6,
579 						const struct sk_buff *skb,
580 						int flags)
581 {
582 	return INDIRECT_CALL_4(lookup,
583 			       ip6_pol_route_output,
584 			       ip6_pol_route_input,
585 			       ip6_pol_route_lookup,
586 			       __ip6_route_redirect,
587 			       net, table, fl6, skb, flags);
588 }
589 
590 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
fib6_has_custom_rules(const struct net * net)591 static inline bool fib6_has_custom_rules(const struct net *net)
592 {
593 	return net->ipv6.fib6_has_custom_rules;
594 }
595 
596 int fib6_rules_init(void);
597 void fib6_rules_cleanup(void);
598 bool fib6_rule_default(const struct fib_rule *rule);
599 int fib6_rules_dump(struct net *net, struct notifier_block *nb,
600 		    struct netlink_ext_ack *extack);
601 unsigned int fib6_rules_seq_read(struct net *net);
602 
fib6_rules_early_flow_dissect(struct net * net,struct sk_buff * skb,struct flowi6 * fl6,struct flow_keys * flkeys)603 static inline bool fib6_rules_early_flow_dissect(struct net *net,
604 						 struct sk_buff *skb,
605 						 struct flowi6 *fl6,
606 						 struct flow_keys *flkeys)
607 {
608 	unsigned int flag = FLOW_DISSECTOR_F_STOP_AT_ENCAP;
609 
610 	if (!net->ipv6.fib6_rules_require_fldissect)
611 		return false;
612 
613 	skb_flow_dissect_flow_keys(skb, flkeys, flag);
614 	fl6->fl6_sport = flkeys->ports.src;
615 	fl6->fl6_dport = flkeys->ports.dst;
616 	fl6->flowi6_proto = flkeys->basic.ip_proto;
617 
618 	return true;
619 }
620 #else
fib6_has_custom_rules(const struct net * net)621 static inline bool fib6_has_custom_rules(const struct net *net)
622 {
623 	return false;
624 }
fib6_rules_init(void)625 static inline int               fib6_rules_init(void)
626 {
627 	return 0;
628 }
fib6_rules_cleanup(void)629 static inline void              fib6_rules_cleanup(void)
630 {
631 	return ;
632 }
fib6_rule_default(const struct fib_rule * rule)633 static inline bool fib6_rule_default(const struct fib_rule *rule)
634 {
635 	return true;
636 }
fib6_rules_dump(struct net * net,struct notifier_block * nb,struct netlink_ext_ack * extack)637 static inline int fib6_rules_dump(struct net *net, struct notifier_block *nb,
638 				  struct netlink_ext_ack *extack)
639 {
640 	return 0;
641 }
fib6_rules_seq_read(struct net * net)642 static inline unsigned int fib6_rules_seq_read(struct net *net)
643 {
644 	return 0;
645 }
fib6_rules_early_flow_dissect(struct net * net,struct sk_buff * skb,struct flowi6 * fl6,struct flow_keys * flkeys)646 static inline bool fib6_rules_early_flow_dissect(struct net *net,
647 						 struct sk_buff *skb,
648 						 struct flowi6 *fl6,
649 						 struct flow_keys *flkeys)
650 {
651 	return false;
652 }
653 #endif
654 #endif
655