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2024-05-16 8d2a02b24d66aa359e83eebc1ed3c0f85367a1cb 
 kernel/include/net/ip6_fib.h
....@@ -1,13 +1,9 @@
1
+/* SPDX-License-Identifier: GPL-2.0-or-later */
12 /*
23  *	Linux INET6 implementation 
34  *
45  *	Authors:
56  *	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.
117  */
128 
139 #ifndef _IP6_FIB_H
....@@ -17,11 +13,14 @@
1713 #include <linux/rtnetlink.h>
1814 #include <linux/spinlock.h>
1915 #include <linux/notifier.h>
16
+#include <linux/android_kabi.h>
2017 #include <net/dst.h>
2118 #include <net/flow.h>
19
+#include <net/ip_fib.h>
2220 #include <net/netlink.h>
2321 #include <net/inetpeer.h>
2422 #include <net/fib_notifier.h>
23
+#include <linux/indirect_call_wrapper.h>
2524 
2625 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
2726 #define FIB6_TABLE_HASHSZ 256
....@@ -50,7 +49,9 @@
5049 	u32		fc_protocol;
5150 	u16		fc_type;        /* only 8 bits are used */
5251 	u16		fc_delete_all_nh : 1,
53
-			__unused : 15;
52
+			fc_ignore_dev_down:1,
53
+			__unused : 14;
54
+	u32		fc_nh_id;
5455 
5556 	struct in6_addr	fc_dst;
5657 	struct in6_addr	fc_src;
....@@ -66,6 +67,9 @@
6667 	struct nl_info	fc_nlinfo;
6768 	struct nlattr	*fc_encap;
6869 	u16		fc_encap_type;
70
+	bool		fc_is_fdb;
71
+
72
+	ANDROID_KABI_RESERVE(1);
6973 };
7074 
7175 struct fib6_node {
....@@ -82,6 +86,8 @@
8286 	int			fn_sernum;
8387 	struct fib6_info __rcu	*rr_ptr;
8488 	struct rcu_head		rcu;
89
+
90
+	ANDROID_KABI_RESERVE(1);
8591 };
8692 
8793 struct fib6_gc_args {
....@@ -91,7 +97,32 @@
9197 
9298 #ifndef CONFIG_IPV6_SUBTREES
9399 #define FIB6_SUBTREE(fn)	NULL
100
+
101
+static inline bool fib6_routes_require_src(const struct net *net)
102
+{
103
+	return false;
104
+}
105
+
106
+static inline void fib6_routes_require_src_inc(struct net *net) {}
107
+static inline void fib6_routes_require_src_dec(struct net *net) {}
108
+
94109 #else
110
+
111
+static inline bool fib6_routes_require_src(const struct net *net)
112
+{
113
+	return net->ipv6.fib6_routes_require_src > 0;
114
+}
115
+
116
+static inline void fib6_routes_require_src_inc(struct net *net)
117
+{
118
+	net->ipv6.fib6_routes_require_src++;
119
+}
120
+
121
+static inline void fib6_routes_require_src_dec(struct net *net)
122
+{
123
+	net->ipv6.fib6_routes_require_src--;
124
+}
125
+
95126 #define FIB6_SUBTREE(fn)	(rcu_dereference_protected((fn)->subtree, 1))
96127 #endif
97128 
....@@ -124,13 +155,14 @@
124155 #define FIB6_MAX_DEPTH 5
125156 
126157 struct fib6_nh {
127
-	struct in6_addr		nh_gw;
128
-	struct net_device	*nh_dev;
129
-	struct lwtunnel_state	*nh_lwtstate;
158
+	struct fib_nh_common	nh_common;
130159 
131
-	unsigned int		nh_flags;
132
-	atomic_t		nh_upper_bound;
133
-	int			nh_weight;
160
+#ifdef CONFIG_IPV6_ROUTER_PREF
161
+	unsigned long		last_probe;
162
+#endif
163
+
164
+	struct rt6_info * __percpu *rt6i_pcpu;
165
+	struct rt6_exception_bucket __rcu *rt6i_exception_bucket;
134166 };
135167 
136168 struct fib6_info {
....@@ -139,14 +171,17 @@
139171 	struct fib6_node __rcu		*fib6_node;
140172 
141173 	/* Multipath routes:
142
-	 * siblings is a list of fib6_info that have the the same metric/weight,
174
+	 * siblings is a list of fib6_info that have the same metric/weight,
143175 	 * destination, but not the same gateway. nsiblings is just a cache
144176 	 * to speed up lookup.
145177 	 */
146
-	struct list_head		fib6_siblings;
178
+	union {
179
+		struct list_head	fib6_siblings;
180
+		struct list_head	nh_list;
181
+	};
147182 	unsigned int			fib6_nsiblings;
148183 
149
-	atomic_t			fib6_ref;
184
+	refcount_t			fib6_ref;
150185 	unsigned long			expires;
151186 	struct dst_metrics		*fib6_metrics;
152187 #define fib6_pmtu		fib6_metrics->metrics[RTAX_MTU-1]
....@@ -156,44 +191,51 @@
156191 	struct rt6key			fib6_src;
157192 	struct rt6key			fib6_prefsrc;
158193 
159
-	struct rt6_info * __percpu	*rt6i_pcpu;
160
-	struct rt6_exception_bucket __rcu *rt6i_exception_bucket;
161
-
162
-#ifdef CONFIG_IPV6_ROUTER_PREF
163
-	unsigned long			last_probe;
164
-#endif
165
-
166194 	u32				fib6_metric;
167195 	u8				fib6_protocol;
168196 	u8				fib6_type;
169
-	u8				exception_bucket_flushed:1,
170
-					should_flush:1,
197
+	u8				should_flush:1,
171198 					dst_nocount:1,
172199 					dst_nopolicy:1,
173
-					dst_host:1,
174200 					fib6_destroying:1,
201
+					offload:1,
202
+					trap:1,
175203 					unused:2;
176204 
177
-	struct fib6_nh			fib6_nh;
178205 	struct rcu_head			rcu;
206
+	struct nexthop			*nh;
207
+
208
+	ANDROID_KABI_RESERVE(1);
209
+
210
+	struct fib6_nh			fib6_nh[];
179211 };
180212 
181213 struct rt6_info {
182214 	struct dst_entry		dst;
183215 	struct fib6_info __rcu		*from;
216
+	int				sernum;
184217 
185218 	struct rt6key			rt6i_dst;
186219 	struct rt6key			rt6i_src;
187220 	struct in6_addr			rt6i_gateway;
188221 	struct inet6_dev		*rt6i_idev;
189222 	u32				rt6i_flags;
190
-	struct rt6key			rt6i_prefsrc;
191223 
192224 	struct list_head		rt6i_uncached;
193225 	struct uncached_list		*rt6i_uncached_list;
194226 
195227 	/* more non-fragment space at head required */
196228 	unsigned short			rt6i_nfheader_len;
229
+
230
+	ANDROID_KABI_RESERVE(1);
231
+};
232
+
233
+struct fib6_result {
234
+	struct fib6_nh		*nh;
235
+	struct fib6_info	*f6i;
236
+	u32			fib6_flags;
237
+	u8			fib6_type;
238
+	struct rt6_info		*rt6;
197239 };
198240 
199241 #define for_each_fib6_node_rt_rcu(fn)					\
....@@ -207,6 +249,11 @@
207249 static inline struct inet6_dev *ip6_dst_idev(struct dst_entry *dst)
208250 {
209251 	return ((struct rt6_info *)dst)->rt6i_idev;
252
+}
253
+
254
+static inline bool fib6_requires_src(const struct fib6_info *rt)
255
+{
256
+	return rt->fib6_src.plen > 0;
210257 }
211258 
212259 static inline void fib6_clean_expires(struct fib6_info *f6i)
....@@ -257,6 +304,9 @@
257304 	struct fib6_info *from;
258305 	u32 cookie = 0;
259306 
307
+	if (rt->sernum)
308
+		return rt->sernum;
309
+
260310 	rcu_read_lock();
261311 
262312 	from = rcu_dereference(rt->from);
....@@ -277,23 +327,30 @@
277327 	dst_release(&rt->dst);
278328 }
279329 
280
-struct fib6_info *fib6_info_alloc(gfp_t gfp_flags);
330
+struct fib6_info *fib6_info_alloc(gfp_t gfp_flags, bool with_fib6_nh);
281331 void fib6_info_destroy_rcu(struct rcu_head *head);
282332 
283333 static inline void fib6_info_hold(struct fib6_info *f6i)
284334 {
285
-	atomic_inc(&f6i->fib6_ref);
335
+	refcount_inc(&f6i->fib6_ref);
286336 }
287337 
288338 static inline bool fib6_info_hold_safe(struct fib6_info *f6i)
289339 {
290
-	return atomic_inc_not_zero(&f6i->fib6_ref);
340
+	return refcount_inc_not_zero(&f6i->fib6_ref);
291341 }
292342 
293343 static inline void fib6_info_release(struct fib6_info *f6i)
294344 {
295
-	if (f6i && atomic_dec_and_test(&f6i->fib6_ref))
345
+	if (f6i && refcount_dec_and_test(&f6i->fib6_ref))
296346 		call_rcu(&f6i->rcu, fib6_info_destroy_rcu);
347
+}
348
+
349
+static inline void fib6_info_hw_flags_set(struct fib6_info *f6i, bool offload,
350
+					  bool trap)
351
+{
352
+	f6i->offload = offload;
353
+	f6i->trap = trap;
297354 }
298355 
299356 enum fib6_walk_state {
....@@ -313,6 +370,7 @@
313370 	enum fib6_walk_state state;
314371 	unsigned int skip;
315372 	unsigned int count;
373
+	unsigned int skip_in_node;
316374 	int (*func)(struct fib6_walker *);
317375 	void *args;
318376 };
....@@ -374,6 +432,7 @@
374432 struct fib6_entry_notifier_info {
375433 	struct fib_notifier_info info; /* must be first */
376434 	struct fib6_info *rt;
435
+	unsigned int nsiblings;
377436 };
378437 
379438 /*
....@@ -389,18 +448,17 @@
389448 /* called with rcu lock held; can return error pointer
390449  * caller needs to select path
391450  */
392
-struct fib6_info *fib6_lookup(struct net *net, int oif, struct flowi6 *fl6,
393
-			      int flags);
451
+int fib6_lookup(struct net *net, int oif, struct flowi6 *fl6,
452
+		struct fib6_result *res, int flags);
394453 
395454 /* called with rcu lock held; caller needs to select path */
396
-struct fib6_info *fib6_table_lookup(struct net *net, struct fib6_table *table,
397
-				    int oif, struct flowi6 *fl6, int strict);
455
+int fib6_table_lookup(struct net *net, struct fib6_table *table,
456
+		      int oif, struct flowi6 *fl6, struct fib6_result *res,
457
+		      int strict);
398458 
399
-struct fib6_info *fib6_multipath_select(const struct net *net,
400
-					struct fib6_info *match,
401
-					struct flowi6 *fl6, int oif,
402
-					const struct sk_buff *skb, int strict);
403
-
459
+void fib6_select_path(const struct net *net, struct fib6_result *res,
460
+		      struct flowi6 *fl6, int oif, bool have_oif_match,
461
+		      const struct sk_buff *skb, int strict);
404462 struct fib6_node *fib6_node_lookup(struct fib6_node *root,
405463 				   const struct in6_addr *daddr,
406464 				   const struct in6_addr *saddr);
....@@ -412,22 +470,50 @@
412470 
413471 void fib6_clean_all(struct net *net, int (*func)(struct fib6_info *, void *arg),
414472 		    void *arg);
473
+void fib6_clean_all_skip_notify(struct net *net,
474
+				int (*func)(struct fib6_info *, void *arg),
475
+				void *arg);
415476 
416477 int fib6_add(struct fib6_node *root, struct fib6_info *rt,
417478 	     struct nl_info *info, struct netlink_ext_ack *extack);
418479 int fib6_del(struct fib6_info *rt, struct nl_info *info);
419480 
420
-static inline struct net_device *fib6_info_nh_dev(const struct fib6_info *f6i)
421
-{
422
-	return f6i->fib6_nh.nh_dev;
423
-}
424
-
425481 static inline
426
-struct lwtunnel_state *fib6_info_nh_lwt(const struct fib6_info *f6i)
482
+void rt6_get_prefsrc(const struct rt6_info *rt, struct in6_addr *addr)
427483 {
428
-	return f6i->fib6_nh.nh_lwtstate;
484
+	const struct fib6_info *from;
485
+
486
+	rcu_read_lock();
487
+
488
+	from = rcu_dereference(rt->from);
489
+	if (from) {
490
+		*addr = from->fib6_prefsrc.addr;
491
+	} else {
492
+		struct in6_addr in6_zero = {};
493
+
494
+		*addr = in6_zero;
495
+	}
496
+
497
+	rcu_read_unlock();
429498 }
430499 
500
+int fib6_nh_init(struct net *net, struct fib6_nh *fib6_nh,
501
+		 struct fib6_config *cfg, gfp_t gfp_flags,
502
+		 struct netlink_ext_ack *extack);
503
+void fib6_nh_release(struct fib6_nh *fib6_nh);
504
+
505
+int call_fib6_entry_notifiers(struct net *net,
506
+			      enum fib_event_type event_type,
507
+			      struct fib6_info *rt,
508
+			      struct netlink_ext_ack *extack);
509
+int call_fib6_multipath_entry_notifiers(struct net *net,
510
+					enum fib_event_type event_type,
511
+					struct fib6_info *rt,
512
+					unsigned int nsiblings,
513
+					struct netlink_ext_ack *extack);
514
+int call_fib6_entry_notifiers_replace(struct net *net, struct fib6_info *rt);
515
+void fib6_rt_update(struct net *net, struct fib6_info *rt,
516
+		    struct nl_info *info);
431517 void inet6_rt_notify(int event, struct fib6_info *rt, struct nl_info *info,
432518 		     unsigned int flags);
433519 
....@@ -447,7 +533,7 @@
447533 
448534 extern const struct seq_operations ipv6_route_seq_ops;
449535 
450
-int call_fib6_notifier(struct notifier_block *nb, struct net *net,
536
+int call_fib6_notifier(struct notifier_block *nb,
451537 		       enum fib_event_type event_type,
452538 		       struct fib_notifier_info *info);
453539 int call_fib6_notifiers(struct net *net, enum fib_event_type event_type,
....@@ -457,10 +543,12 @@
457543 void __net_exit fib6_notifier_exit(struct net *net);
458544 
459545 unsigned int fib6_tables_seq_read(struct net *net);
460
-int fib6_tables_dump(struct net *net, struct notifier_block *nb);
546
+int fib6_tables_dump(struct net *net, struct notifier_block *nb,
547
+		     struct netlink_ext_ack *extack);
461548 
462549 void fib6_update_sernum(struct net *net, struct fib6_info *rt);
463550 void fib6_update_sernum_upto_root(struct net *net, struct fib6_info *rt);
551
+void fib6_update_sernum_stub(struct net *net, struct fib6_info *f6i);
464552 
465553 void fib6_metric_set(struct fib6_info *f6i, int metric, u32 val);
466554 static inline bool fib6_metric_locked(struct fib6_info *f6i, int metric)
....@@ -468,11 +556,59 @@
468556 	return !!(f6i->fib6_metrics->metrics[RTAX_LOCK - 1] & (1 << metric));
469557 }
470558 
559
+#if IS_BUILTIN(CONFIG_IPV6) && defined(CONFIG_BPF_SYSCALL)
560
+struct bpf_iter__ipv6_route {
561
+	__bpf_md_ptr(struct bpf_iter_meta *, meta);
562
+	__bpf_md_ptr(struct fib6_info *, rt);
563
+};
564
+#endif
565
+
566
+INDIRECT_CALLABLE_DECLARE(struct rt6_info *ip6_pol_route_output(struct net *net,
567
+					     struct fib6_table *table,
568
+					     struct flowi6 *fl6,
569
+					     const struct sk_buff *skb,
570
+					     int flags));
571
+INDIRECT_CALLABLE_DECLARE(struct rt6_info *ip6_pol_route_input(struct net *net,
572
+					     struct fib6_table *table,
573
+					     struct flowi6 *fl6,
574
+					     const struct sk_buff *skb,
575
+					     int flags));
576
+INDIRECT_CALLABLE_DECLARE(struct rt6_info *__ip6_route_redirect(struct net *net,
577
+					     struct fib6_table *table,
578
+					     struct flowi6 *fl6,
579
+					     const struct sk_buff *skb,
580
+					     int flags));
581
+INDIRECT_CALLABLE_DECLARE(struct rt6_info *ip6_pol_route_lookup(struct net *net,
582
+					     struct fib6_table *table,
583
+					     struct flowi6 *fl6,
584
+					     const struct sk_buff *skb,
585
+					     int flags));
586
+static inline struct rt6_info *pol_lookup_func(pol_lookup_t lookup,
587
+						struct net *net,
588
+						struct fib6_table *table,
589
+						struct flowi6 *fl6,
590
+						const struct sk_buff *skb,
591
+						int flags)
592
+{
593
+	return INDIRECT_CALL_4(lookup,
594
+			       ip6_pol_route_output,
595
+			       ip6_pol_route_input,
596
+			       ip6_pol_route_lookup,
597
+			       __ip6_route_redirect,
598
+			       net, table, fl6, skb, flags);
599
+}
600
+
471601 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
602
+static inline bool fib6_has_custom_rules(const struct net *net)
603
+{
604
+	return net->ipv6.fib6_has_custom_rules;
605
+}
606
+
472607 int fib6_rules_init(void);
473608 void fib6_rules_cleanup(void);
474609 bool fib6_rule_default(const struct fib_rule *rule);
475
-int fib6_rules_dump(struct net *net, struct notifier_block *nb);
610
+int fib6_rules_dump(struct net *net, struct notifier_block *nb,
611
+		    struct netlink_ext_ack *extack);
476612 unsigned int fib6_rules_seq_read(struct net *net);
477613 
478614 static inline bool fib6_rules_early_flow_dissect(struct net *net,
....@@ -493,6 +629,10 @@
493629 	return true;
494630 }
495631 #else
632
+static inline bool fib6_has_custom_rules(const struct net *net)
633
+{
634
+	return false;
635
+}
496636 static inline int               fib6_rules_init(void)
497637 {
498638 	return 0;
....@@ -505,7 +645,8 @@
505645 {
506646 	return true;
507647 }
508
-static inline int fib6_rules_dump(struct net *net, struct notifier_block *nb)
648
+static inline int fib6_rules_dump(struct net *net, struct notifier_block *nb,
649
+				  struct netlink_ext_ack *extack)
509650 {
510651 	return 0;
511652 }