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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
38struct rt6_info;
39struct fib6_info;
40
41struct 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
72struct 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
88struct fib6_gc_args {
89 int timeout;
90 int more;
91};
92
93#ifndef CONFIG_IPV6_SUBTREES
94#define FIB6_SUBTREE(fn) NULL
95
96static inline bool fib6_routes_require_src(const struct net *net)
97{
98 return false;
99}
100
101static inline void fib6_routes_require_src_inc(struct net *net) {}
102static inline void fib6_routes_require_src_dec(struct net *net) {}
103
104#else
105
106static inline bool fib6_routes_require_src(const struct net *net)
107{
108 return net->ipv6.fib6_routes_require_src > 0;
109}
110
111static inline void fib6_routes_require_src_inc(struct net *net)
112{
113 net->ipv6.fib6_routes_require_src++;
114}
115
116static 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
129struct rt6key {
130 struct in6_addr addr;
131 int plen;
132};
133
134struct fib6_table;
135
136struct rt6_exception_bucket {
137 struct hlist_head chain;
138 int depth;
139};
140
141struct 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
152struct 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
163struct 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
206struct 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
224struct 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
240static inline struct inet6_dev *ip6_dst_idev(struct dst_entry *dst)
241{
242 return ((struct rt6_info *)dst)->rt6i_idev;
243}
244
245static inline bool fib6_requires_src(const struct fib6_info *rt)
246{
247 return rt->fib6_src.plen > 0;
248}
249
250static inline void fib6_clean_expires(struct fib6_info *f6i)
251{
252 f6i->fib6_flags &= ~RTF_EXPIRES;
253 f6i->expires = 0;
254}
255
256static 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
263static 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 */
275static 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
293static 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
312static 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
321struct fib6_info *fib6_info_alloc(gfp_t gfp_flags, bool with_fib6_nh);
322void fib6_info_destroy_rcu(struct rcu_head *head);
323
324static inline void fib6_info_hold(struct fib6_info *f6i)
325{
326 refcount_inc(&f6i->fib6_ref);
327}
328
329static inline bool fib6_info_hold_safe(struct fib6_info *f6i)
330{
331 return refcount_inc_not_zero(&f6i->fib6_ref);
332}
333
334static 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
340enum 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
350struct 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
362struct 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
384struct 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
411typedef struct rt6_info *(*pol_lookup_t)(struct net *,
412 struct fib6_table *,
413 struct flowi6 *,
414 const struct sk_buff *, int);
415
416struct 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
426struct fib6_table *fib6_get_table(struct net *net, u32 id);
427struct fib6_table *fib6_new_table(struct net *net, u32 id);
428struct 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 */
435int 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 */
439int fib6_table_lookup(struct net *net, struct fib6_table *table,
440 int oif, struct flowi6 *fl6, struct fib6_result *res,
441 int strict);
442
443void 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);
446struct fib6_node *fib6_node_lookup(struct fib6_node *root,
447 const struct in6_addr *daddr,
448 const struct in6_addr *saddr);
449
450struct 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
455void fib6_clean_all(struct net *net, int (*func)(struct fib6_info *, void *arg),
456 void *arg);
457void fib6_clean_all_skip_notify(struct net *net,
458 int (*func)(struct fib6_info *, void *arg),
459 void *arg);
460
461int fib6_add(struct fib6_node *root, struct fib6_info *rt,
462 struct nl_info *info, struct netlink_ext_ack *extack);
463int fib6_del(struct fib6_info *rt, struct nl_info *info);
464
465static inline
466void 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
484int 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);
487void fib6_nh_release(struct fib6_nh *fib6_nh);
488
489int call_fib6_entry_notifiers(struct net *net,
490 enum fib_event_type event_type,
491 struct fib6_info *rt,
492 struct netlink_ext_ack *extack);
493int call_fib6_multipath_entry_notifiers(struct net *net,
494 enum fib_event_type event_type,
495 struct fib6_info *rt,
496 unsigned int nsiblings,
497 struct netlink_ext_ack *extack);
498int call_fib6_entry_notifiers_replace(struct net *net, struct fib6_info *rt);
499void fib6_rt_update(struct net *net, struct fib6_info *rt,
500 struct nl_info *info);
501void inet6_rt_notify(int event, struct fib6_info *rt, struct nl_info *info,
502 unsigned int flags);
503
504void fib6_run_gc(unsigned long expires, struct net *net, bool force);
505
506void fib6_gc_cleanup(void);
507
508int fib6_init(void);
509
510struct ipv6_route_iter {
511 struct seq_net_private p;
512 struct fib6_walker w;
513 loff_t skip;
514 struct fib6_table *tbl;
515 int sernum;
516};
517
518extern const struct seq_operations ipv6_route_seq_ops;
519
520int call_fib6_notifier(struct notifier_block *nb,
521 enum fib_event_type event_type,
522 struct fib_notifier_info *info);
523int call_fib6_notifiers(struct net *net, enum fib_event_type event_type,
524 struct fib_notifier_info *info);
525
526int __net_init fib6_notifier_init(struct net *net);
527void __net_exit fib6_notifier_exit(struct net *net);
528
529unsigned int fib6_tables_seq_read(struct net *net);
530int fib6_tables_dump(struct net *net, struct notifier_block *nb,
531 struct netlink_ext_ack *extack);
532
533void fib6_update_sernum(struct net *net, struct fib6_info *rt);
534void fib6_update_sernum_upto_root(struct net *net, struct fib6_info *rt);
535void fib6_update_sernum_stub(struct net *net, struct fib6_info *f6i);
536
537void fib6_metric_set(struct fib6_info *f6i, int metric, u32 val);
538static inline bool fib6_metric_locked(struct fib6_info *f6i, int metric)
539{
540 return !!(f6i->fib6_metrics->metrics[RTAX_LOCK - 1] & (1 << metric));
541}
542void fib6_info_hw_flags_set(struct net *net, struct fib6_info *f6i,
543 bool offload, bool trap, bool offload_failed);
544
545#if IS_BUILTIN(CONFIG_IPV6) && defined(CONFIG_BPF_SYSCALL)
546struct bpf_iter__ipv6_route {
547 __bpf_md_ptr(struct bpf_iter_meta *, meta);
548 __bpf_md_ptr(struct fib6_info *, rt);
549};
550#endif
551
552INDIRECT_CALLABLE_DECLARE(struct rt6_info *ip6_pol_route_output(struct net *net,
553 struct fib6_table *table,
554 struct flowi6 *fl6,
555 const struct sk_buff *skb,
556 int flags));
557INDIRECT_CALLABLE_DECLARE(struct rt6_info *ip6_pol_route_input(struct net *net,
558 struct fib6_table *table,
559 struct flowi6 *fl6,
560 const struct sk_buff *skb,
561 int flags));
562INDIRECT_CALLABLE_DECLARE(struct rt6_info *__ip6_route_redirect(struct net *net,
563 struct fib6_table *table,
564 struct flowi6 *fl6,
565 const struct sk_buff *skb,
566 int flags));
567INDIRECT_CALLABLE_DECLARE(struct rt6_info *ip6_pol_route_lookup(struct net *net,
568 struct fib6_table *table,
569 struct flowi6 *fl6,
570 const struct sk_buff *skb,
571 int flags));
572static inline struct rt6_info *pol_lookup_func(pol_lookup_t lookup,
573 struct net *net,
574 struct fib6_table *table,
575 struct flowi6 *fl6,
576 const struct sk_buff *skb,
577 int flags)
578{
579 return INDIRECT_CALL_4(lookup,
580 ip6_pol_route_output,
581 ip6_pol_route_input,
582 ip6_pol_route_lookup,
583 __ip6_route_redirect,
584 net, table, fl6, skb, flags);
585}
586
587#ifdef CONFIG_IPV6_MULTIPLE_TABLES
588static inline bool fib6_has_custom_rules(const struct net *net)
589{
590 return net->ipv6.fib6_has_custom_rules;
591}
592
593int fib6_rules_init(void);
594void fib6_rules_cleanup(void);
595bool fib6_rule_default(const struct fib_rule *rule);
596int fib6_rules_dump(struct net *net, struct notifier_block *nb,
597 struct netlink_ext_ack *extack);
598unsigned int fib6_rules_seq_read(struct net *net);
599
600static inline bool fib6_rules_early_flow_dissect(struct net *net,
601 struct sk_buff *skb,
602 struct flowi6 *fl6,
603 struct flow_keys *flkeys)
604{
605 unsigned int flag = FLOW_DISSECTOR_F_STOP_AT_ENCAP;
606
607 if (!net->ipv6.fib6_rules_require_fldissect)
608 return false;
609
610 skb_flow_dissect_flow_keys(skb, flkeys, flag);
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
618static inline bool fib6_has_custom_rules(const struct net *net)
619{
620 return false;
621}
622static inline int fib6_rules_init(void)
623{
624 return 0;
625}
626static inline void fib6_rules_cleanup(void)
627{
628 return ;
629}
630static inline bool fib6_rule_default(const struct fib_rule *rule)
631{
632 return true;
633}
634static inline int fib6_rules_dump(struct net *net, struct notifier_block *nb,
635 struct netlink_ext_ack *extack)
636{
637 return 0;
638}
639static inline unsigned int fib6_rules_seq_read(struct net *net)
640{
641 return 0;
642}
643static 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
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
39struct rt6_info;
40struct fib6_info;
41
42struct 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
73struct 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
89struct fib6_gc_args {
90 int timeout;
91 int more;
92};
93
94#ifndef CONFIG_IPV6_SUBTREES
95#define FIB6_SUBTREE(fn) NULL
96
97static inline bool fib6_routes_require_src(const struct net *net)
98{
99 return false;
100}
101
102static inline void fib6_routes_require_src_inc(struct net *net) {}
103static inline void fib6_routes_require_src_dec(struct net *net) {}
104
105#else
106
107static inline bool fib6_routes_require_src(const struct net *net)
108{
109 return net->ipv6.fib6_routes_require_src > 0;
110}
111
112static inline void fib6_routes_require_src_inc(struct net *net)
113{
114 net->ipv6.fib6_routes_require_src++;
115}
116
117static 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
130struct rt6key {
131 struct in6_addr addr;
132 int plen;
133};
134
135struct fib6_table;
136
137struct rt6_exception_bucket {
138 struct hlist_head chain;
139 int depth;
140};
141
142struct 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
153struct 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
164struct 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
209struct 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
224struct 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
240static inline struct inet6_dev *ip6_dst_idev(struct dst_entry *dst)
241{
242 return ((struct rt6_info *)dst)->rt6i_idev;
243}
244
245static inline bool fib6_requires_src(const struct fib6_info *rt)
246{
247 return rt->fib6_src.plen > 0;
248}
249
250static inline void fib6_clean_expires(struct fib6_info *f6i)
251{
252 f6i->fib6_flags &= ~RTF_EXPIRES;
253 f6i->expires = 0;
254}
255
256static 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
263static 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 */
275static 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
293static 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
312static 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
321struct fib6_info *fib6_info_alloc(gfp_t gfp_flags, bool with_fib6_nh);
322void fib6_info_destroy_rcu(struct rcu_head *head);
323
324static inline void fib6_info_hold(struct fib6_info *f6i)
325{
326 refcount_inc(&f6i->fib6_ref);
327}
328
329static inline bool fib6_info_hold_safe(struct fib6_info *f6i)
330{
331 return refcount_inc_not_zero(&f6i->fib6_ref);
332}
333
334static 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
340enum 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
350struct 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
362struct 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
383struct 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
410typedef struct rt6_info *(*pol_lookup_t)(struct net *,
411 struct fib6_table *,
412 struct flowi6 *,
413 const struct sk_buff *, int);
414
415struct 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
425struct fib6_table *fib6_get_table(struct net *net, u32 id);
426struct fib6_table *fib6_new_table(struct net *net, u32 id);
427struct 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 */
434int 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 */
438int fib6_table_lookup(struct net *net, struct fib6_table *table,
439 int oif, struct flowi6 *fl6, struct fib6_result *res,
440 int strict);
441
442void 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);
445struct fib6_node *fib6_node_lookup(struct fib6_node *root,
446 const struct in6_addr *daddr,
447 const struct in6_addr *saddr);
448
449struct 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
454void fib6_clean_all(struct net *net, int (*func)(struct fib6_info *, void *arg),
455 void *arg);
456void fib6_clean_all_skip_notify(struct net *net,
457 int (*func)(struct fib6_info *, void *arg),
458 void *arg);
459
460int fib6_add(struct fib6_node *root, struct fib6_info *rt,
461 struct nl_info *info, struct netlink_ext_ack *extack);
462int fib6_del(struct fib6_info *rt, struct nl_info *info);
463
464static inline
465void 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
480int 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);
483void fib6_nh_release(struct fib6_nh *fib6_nh);
484void fib6_nh_release_dsts(struct fib6_nh *fib6_nh);
485
486int 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);
490int 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);
495int call_fib6_entry_notifiers_replace(struct net *net, struct fib6_info *rt);
496void fib6_rt_update(struct net *net, struct fib6_info *rt,
497 struct nl_info *info);
498void inet6_rt_notify(int event, struct fib6_info *rt, struct nl_info *info,
499 unsigned int flags);
500
501void fib6_run_gc(unsigned long expires, struct net *net, bool force);
502
503void fib6_gc_cleanup(void);
504
505int fib6_init(void);
506
507struct 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
515extern const struct seq_operations ipv6_route_seq_ops;
516
517int call_fib6_notifier(struct notifier_block *nb,
518 enum fib_event_type event_type,
519 struct fib_notifier_info *info);
520int call_fib6_notifiers(struct net *net, enum fib_event_type event_type,
521 struct fib_notifier_info *info);
522
523int __net_init fib6_notifier_init(struct net *net);
524void __net_exit fib6_notifier_exit(struct net *net);
525
526unsigned int fib6_tables_seq_read(struct net *net);
527int fib6_tables_dump(struct net *net, struct notifier_block *nb,
528 struct netlink_ext_ack *extack);
529
530void fib6_update_sernum(struct net *net, struct fib6_info *rt);
531void fib6_update_sernum_upto_root(struct net *net, struct fib6_info *rt);
532void fib6_update_sernum_stub(struct net *net, struct fib6_info *f6i);
533
534void fib6_metric_set(struct fib6_info *f6i, int metric, u32 val);
535static inline bool fib6_metric_locked(struct fib6_info *f6i, int metric)
536{
537 return !!(f6i->fib6_metrics->metrics[RTAX_LOCK - 1] & (1 << metric));
538}
539void 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)
543struct 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
549INDIRECT_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));
554INDIRECT_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));
559INDIRECT_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));
564INDIRECT_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));
569static 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
585static inline bool fib6_has_custom_rules(const struct net *net)
586{
587 return net->ipv6.fib6_has_custom_rules;
588}
589
590int fib6_rules_init(void);
591void fib6_rules_cleanup(void);
592bool fib6_rule_default(const struct fib_rule *rule);
593int fib6_rules_dump(struct net *net, struct notifier_block *nb,
594 struct netlink_ext_ack *extack);
595unsigned int fib6_rules_seq_read(struct net *net);
596
597static 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
618static inline bool fib6_has_custom_rules(const struct net *net)
619{
620 return false;
621}
622static inline int fib6_rules_init(void)
623{
624 return 0;
625}
626static inline void fib6_rules_cleanup(void)
627{
628 return ;
629}
630static inline bool fib6_rule_default(const struct fib_rule *rule)
631{
632 return true;
633}
634static inline int fib6_rules_dump(struct net *net, struct notifier_block *nb,
635 struct netlink_ext_ack *extack)
636{
637 return 0;
638}
639static inline unsigned int fib6_rules_seq_read(struct net *net)
640{
641 return 0;
642}
643static 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