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 	/* 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 = READ_ONCE(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 stat is not protected by any lock */
370 	atomic_t	fib_rt_alloc;		/* total number of routes alloced */
371 };
372 
373 #define RTN_TL_ROOT	0x0001
374 #define RTN_ROOT	0x0002		/* tree root node		*/
375 #define RTN_RTINFO	0x0004		/* node with valid routing info	*/
376 
377 /*
378  *	priority levels (or metrics)
379  *
380  */
381 
382 
383 struct fib6_table {
384 	struct hlist_node	tb6_hlist;
385 	u32			tb6_id;
386 	spinlock_t		tb6_lock;
387 	struct fib6_node	tb6_root;
388 	struct inet_peer_base	tb6_peers;
389 	unsigned int		flags;
390 	unsigned int		fib_seq;
391 #define RT6_TABLE_HAS_DFLT_ROUTER	BIT(0)
392 };
393 
394 #define RT6_TABLE_UNSPEC	RT_TABLE_UNSPEC
395 #define RT6_TABLE_MAIN		RT_TABLE_MAIN
396 #define RT6_TABLE_DFLT		RT6_TABLE_MAIN
397 #define RT6_TABLE_INFO		RT6_TABLE_MAIN
398 #define RT6_TABLE_PREFIX	RT6_TABLE_MAIN
399 
400 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
401 #define FIB6_TABLE_MIN		1
402 #define FIB6_TABLE_MAX		RT_TABLE_MAX
403 #define RT6_TABLE_LOCAL		RT_TABLE_LOCAL
404 #else
405 #define FIB6_TABLE_MIN		RT_TABLE_MAIN
406 #define FIB6_TABLE_MAX		FIB6_TABLE_MIN
407 #define RT6_TABLE_LOCAL		RT6_TABLE_MAIN
408 #endif
409 
410 typedef struct rt6_info *(*pol_lookup_t)(struct net *,
411 					 struct fib6_table *,
412 					 struct flowi6 *,
413 					 const struct sk_buff *, int);
414 
415 struct fib6_entry_notifier_info {
416 	struct fib_notifier_info info; /* must be first */
417 	struct fib6_info *rt;
418 	unsigned int nsiblings;
419 };
420 
421 /*
422  *	exported functions
423  */
424 
425 struct fib6_table *fib6_get_table(struct net *net, u32 id);
426 struct fib6_table *fib6_new_table(struct net *net, u32 id);
427 struct dst_entry *fib6_rule_lookup(struct net *net, struct flowi6 *fl6,
428 				   const struct sk_buff *skb,
429 				   int flags, pol_lookup_t lookup);
430 
431 /* called with rcu lock held; can return error pointer
432  * caller needs to select path
433  */
434 int fib6_lookup(struct net *net, int oif, struct flowi6 *fl6,
435 		struct fib6_result *res, int flags);
436 
437 /* called with rcu lock held; caller needs to select path */
438 int fib6_table_lookup(struct net *net, struct fib6_table *table,
439 		      int oif, struct flowi6 *fl6, struct fib6_result *res,
440 		      int strict);
441 
442 void fib6_select_path(const struct net *net, struct fib6_result *res,
443 		      struct flowi6 *fl6, int oif, bool have_oif_match,
444 		      const struct sk_buff *skb, int strict);
445 struct fib6_node *fib6_node_lookup(struct fib6_node *root,
446 				   const struct in6_addr *daddr,
447 				   const struct in6_addr *saddr);
448 
449 struct fib6_node *fib6_locate(struct fib6_node *root,
450 			      const struct in6_addr *daddr, int dst_len,
451 			      const struct in6_addr *saddr, int src_len,
452 			      bool exact_match);
453 
454 void fib6_clean_all(struct net *net, int (*func)(struct fib6_info *, void *arg),
455 		    void *arg);
456 void fib6_clean_all_skip_notify(struct net *net,
457 				int (*func)(struct fib6_info *, void *arg),
458 				void *arg);
459 
460 int fib6_add(struct fib6_node *root, struct fib6_info *rt,
461 	     struct nl_info *info, struct netlink_ext_ack *extack);
462 int fib6_del(struct fib6_info *rt, struct nl_info *info);
463 
464 static inline
rt6_get_prefsrc(const struct rt6_info * rt,struct in6_addr * addr)465 void rt6_get_prefsrc(const struct rt6_info *rt, struct in6_addr *addr)
466 {
467 	const struct fib6_info *from;
468 
469 	rcu_read_lock();
470 
471 	from = rcu_dereference(rt->from);
472 	if (from)
473 		*addr = from->fib6_prefsrc.addr;
474 	else
475 		*addr = in6addr_any;
476 
477 	rcu_read_unlock();
478 }
479 
480 int fib6_nh_init(struct net *net, struct fib6_nh *fib6_nh,
481 		 struct fib6_config *cfg, gfp_t gfp_flags,
482 		 struct netlink_ext_ack *extack);
483 void fib6_nh_release(struct fib6_nh *fib6_nh);
484 void fib6_nh_release_dsts(struct fib6_nh *fib6_nh);
485 
486 int call_fib6_entry_notifiers(struct net *net,
487 			      enum fib_event_type event_type,
488 			      struct fib6_info *rt,
489 			      struct netlink_ext_ack *extack);
490 int call_fib6_multipath_entry_notifiers(struct net *net,
491 					enum fib_event_type event_type,
492 					struct fib6_info *rt,
493 					unsigned int nsiblings,
494 					struct netlink_ext_ack *extack);
495 int call_fib6_entry_notifiers_replace(struct net *net, struct fib6_info *rt);
496 void fib6_rt_update(struct net *net, struct fib6_info *rt,
497 		    struct nl_info *info);
498 void inet6_rt_notify(int event, struct fib6_info *rt, struct nl_info *info,
499 		     unsigned int flags);
500 
501 void fib6_run_gc(unsigned long expires, struct net *net, bool force);
502 
503 void fib6_gc_cleanup(void);
504 
505 int fib6_init(void);
506 
507 struct ipv6_route_iter {
508 	struct seq_net_private p;
509 	struct fib6_walker w;
510 	loff_t skip;
511 	struct fib6_table *tbl;
512 	int sernum;
513 };
514 
515 extern const struct seq_operations ipv6_route_seq_ops;
516 
517 int call_fib6_notifier(struct notifier_block *nb,
518 		       enum fib_event_type event_type,
519 		       struct fib_notifier_info *info);
520 int call_fib6_notifiers(struct net *net, enum fib_event_type event_type,
521 			struct fib_notifier_info *info);
522 
523 int __net_init fib6_notifier_init(struct net *net);
524 void __net_exit fib6_notifier_exit(struct net *net);
525 
526 unsigned int fib6_tables_seq_read(struct net *net);
527 int fib6_tables_dump(struct net *net, struct notifier_block *nb,
528 		     struct netlink_ext_ack *extack);
529 
530 void fib6_update_sernum(struct net *net, struct fib6_info *rt);
531 void fib6_update_sernum_upto_root(struct net *net, struct fib6_info *rt);
532 void fib6_update_sernum_stub(struct net *net, struct fib6_info *f6i);
533 
534 void fib6_metric_set(struct fib6_info *f6i, int metric, u32 val);
fib6_metric_locked(struct fib6_info * f6i,int metric)535 static inline bool fib6_metric_locked(struct fib6_info *f6i, int metric)
536 {
537 	return !!(f6i->fib6_metrics->metrics[RTAX_LOCK - 1] & (1 << metric));
538 }
539 void fib6_info_hw_flags_set(struct net *net, struct fib6_info *f6i,
540 			    bool offload, bool trap, bool offload_failed);
541 
542 #if IS_BUILTIN(CONFIG_IPV6) && defined(CONFIG_BPF_SYSCALL)
543 struct bpf_iter__ipv6_route {
544 	__bpf_md_ptr(struct bpf_iter_meta *, meta);
545 	__bpf_md_ptr(struct fib6_info *, rt);
546 };
547 #endif
548 
549 INDIRECT_CALLABLE_DECLARE(struct rt6_info *ip6_pol_route_output(struct net *net,
550 					     struct fib6_table *table,
551 					     struct flowi6 *fl6,
552 					     const struct sk_buff *skb,
553 					     int flags));
554 INDIRECT_CALLABLE_DECLARE(struct rt6_info *ip6_pol_route_input(struct net *net,
555 					     struct fib6_table *table,
556 					     struct flowi6 *fl6,
557 					     const struct sk_buff *skb,
558 					     int flags));
559 INDIRECT_CALLABLE_DECLARE(struct rt6_info *__ip6_route_redirect(struct net *net,
560 					     struct fib6_table *table,
561 					     struct flowi6 *fl6,
562 					     const struct sk_buff *skb,
563 					     int flags));
564 INDIRECT_CALLABLE_DECLARE(struct rt6_info *ip6_pol_route_lookup(struct net *net,
565 					     struct fib6_table *table,
566 					     struct flowi6 *fl6,
567 					     const struct sk_buff *skb,
568 					     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)569 static inline struct rt6_info *pol_lookup_func(pol_lookup_t lookup,
570 						struct net *net,
571 						struct fib6_table *table,
572 						struct flowi6 *fl6,
573 						const struct sk_buff *skb,
574 						int flags)
575 {
576 	return INDIRECT_CALL_4(lookup,
577 			       ip6_pol_route_output,
578 			       ip6_pol_route_input,
579 			       ip6_pol_route_lookup,
580 			       __ip6_route_redirect,
581 			       net, table, fl6, skb, flags);
582 }
583 
584 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
fib6_has_custom_rules(const struct net * net)585 static inline bool fib6_has_custom_rules(const struct net *net)
586 {
587 	return net->ipv6.fib6_has_custom_rules;
588 }
589 
590 int fib6_rules_init(void);
591 void fib6_rules_cleanup(void);
592 bool fib6_rule_default(const struct fib_rule *rule);
593 int fib6_rules_dump(struct net *net, struct notifier_block *nb,
594 		    struct netlink_ext_ack *extack);
595 unsigned int fib6_rules_seq_read(struct net *net);
596 
fib6_rules_early_flow_dissect(struct net * net,struct sk_buff * skb,struct flowi6 * fl6,struct flow_keys * flkeys)597 static inline bool fib6_rules_early_flow_dissect(struct net *net,
598 						 struct sk_buff *skb,
599 						 struct flowi6 *fl6,
600 						 struct flow_keys *flkeys)
601 {
602 	unsigned int flag = FLOW_DISSECTOR_F_STOP_AT_ENCAP;
603 
604 	if (!net->ipv6.fib6_rules_require_fldissect)
605 		return false;
606 
607 	memset(flkeys, 0, sizeof(*flkeys));
608 	__skb_flow_dissect(net, skb, &flow_keys_dissector,
609 			   flkeys, NULL, 0, 0, 0, flag);
610 
611 	fl6->fl6_sport = flkeys->ports.src;
612 	fl6->fl6_dport = flkeys->ports.dst;
613 	fl6->flowi6_proto = flkeys->basic.ip_proto;
614 
615 	return true;
616 }
617 #else
fib6_has_custom_rules(const struct net * net)618 static inline bool fib6_has_custom_rules(const struct net *net)
619 {
620 	return false;
621 }
fib6_rules_init(void)622 static inline int               fib6_rules_init(void)
623 {
624 	return 0;
625 }
fib6_rules_cleanup(void)626 static inline void              fib6_rules_cleanup(void)
627 {
628 	return ;
629 }
fib6_rule_default(const struct fib_rule * rule)630 static inline bool fib6_rule_default(const struct fib_rule *rule)
631 {
632 	return true;
633 }
fib6_rules_dump(struct net * net,struct notifier_block * nb,struct netlink_ext_ack * extack)634 static inline int fib6_rules_dump(struct net *net, struct notifier_block *nb,
635 				  struct netlink_ext_ack *extack)
636 {
637 	return 0;
638 }
fib6_rules_seq_read(struct net * net)639 static inline unsigned int fib6_rules_seq_read(struct net *net)
640 {
641 	return 0;
642 }
fib6_rules_early_flow_dissect(struct net * net,struct sk_buff * skb,struct flowi6 * fl6,struct flow_keys * flkeys)643 static inline bool fib6_rules_early_flow_dissect(struct net *net,
644 						 struct sk_buff *skb,
645 						 struct flowi6 *fl6,
646 						 struct flow_keys *flkeys)
647 {
648 	return false;
649 }
650 #endif
651 #endif
652