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19baf839 RO |
1 | /* |
2 | * This program is free software; you can redistribute it and/or | |
3 | * modify it under the terms of the GNU General Public License | |
4 | * as published by the Free Software Foundation; either version | |
5 | * 2 of the License, or (at your option) any later version. | |
6 | * | |
7 | * Robert Olsson <robert.olsson@its.uu.se> Uppsala Universitet | |
8 | * & Swedish University of Agricultural Sciences. | |
9 | * | |
e905a9ed | 10 | * Jens Laas <jens.laas@data.slu.se> Swedish University of |
19baf839 | 11 | * Agricultural Sciences. |
e905a9ed | 12 | * |
19baf839 RO |
13 | * Hans Liss <hans.liss@its.uu.se> Uppsala Universitet |
14 | * | |
15 | * This work is based on the LPC-trie which is originally descibed in: | |
e905a9ed | 16 | * |
19baf839 RO |
17 | * An experimental study of compression methods for dynamic tries |
18 | * Stefan Nilsson and Matti Tikkanen. Algorithmica, 33(1):19-33, 2002. | |
19 | * http://www.nada.kth.se/~snilsson/public/papers/dyntrie2/ | |
20 | * | |
21 | * | |
22 | * IP-address lookup using LC-tries. Stefan Nilsson and Gunnar Karlsson | |
23 | * IEEE Journal on Selected Areas in Communications, 17(6):1083-1092, June 1999 | |
24 | * | |
19baf839 RO |
25 | * |
26 | * Code from fib_hash has been reused which includes the following header: | |
27 | * | |
28 | * | |
29 | * INET An implementation of the TCP/IP protocol suite for the LINUX | |
30 | * operating system. INET is implemented using the BSD Socket | |
31 | * interface as the means of communication with the user level. | |
32 | * | |
33 | * IPv4 FIB: lookup engine and maintenance routines. | |
34 | * | |
35 | * | |
36 | * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> | |
37 | * | |
38 | * This program is free software; you can redistribute it and/or | |
39 | * modify it under the terms of the GNU General Public License | |
40 | * as published by the Free Software Foundation; either version | |
41 | * 2 of the License, or (at your option) any later version. | |
fd966255 RO |
42 | * |
43 | * Substantial contributions to this work comes from: | |
44 | * | |
45 | * David S. Miller, <davem@davemloft.net> | |
46 | * Stephen Hemminger <shemminger@osdl.org> | |
47 | * Paul E. McKenney <paulmck@us.ibm.com> | |
48 | * Patrick McHardy <kaber@trash.net> | |
19baf839 RO |
49 | */ |
50 | ||
80b71b80 | 51 | #define VERSION "0.409" |
19baf839 | 52 | |
19baf839 RO |
53 | #include <asm/uaccess.h> |
54 | #include <asm/system.h> | |
1977f032 | 55 | #include <linux/bitops.h> |
19baf839 RO |
56 | #include <linux/types.h> |
57 | #include <linux/kernel.h> | |
19baf839 RO |
58 | #include <linux/mm.h> |
59 | #include <linux/string.h> | |
60 | #include <linux/socket.h> | |
61 | #include <linux/sockios.h> | |
62 | #include <linux/errno.h> | |
63 | #include <linux/in.h> | |
64 | #include <linux/inet.h> | |
cd8787ab | 65 | #include <linux/inetdevice.h> |
19baf839 RO |
66 | #include <linux/netdevice.h> |
67 | #include <linux/if_arp.h> | |
68 | #include <linux/proc_fs.h> | |
2373ce1c | 69 | #include <linux/rcupdate.h> |
19baf839 RO |
70 | #include <linux/skbuff.h> |
71 | #include <linux/netlink.h> | |
72 | #include <linux/init.h> | |
73 | #include <linux/list.h> | |
5a0e3ad6 | 74 | #include <linux/slab.h> |
457c4cbc | 75 | #include <net/net_namespace.h> |
19baf839 RO |
76 | #include <net/ip.h> |
77 | #include <net/protocol.h> | |
78 | #include <net/route.h> | |
79 | #include <net/tcp.h> | |
80 | #include <net/sock.h> | |
81 | #include <net/ip_fib.h> | |
82 | #include "fib_lookup.h" | |
83 | ||
06ef921d | 84 | #define MAX_STAT_DEPTH 32 |
19baf839 | 85 | |
19baf839 | 86 | #define KEYLENGTH (8*sizeof(t_key)) |
19baf839 | 87 | |
19baf839 RO |
88 | typedef unsigned int t_key; |
89 | ||
90 | #define T_TNODE 0 | |
91 | #define T_LEAF 1 | |
92 | #define NODE_TYPE_MASK 0x1UL | |
2373ce1c RO |
93 | #define NODE_TYPE(node) ((node)->parent & NODE_TYPE_MASK) |
94 | ||
91b9a277 OJ |
95 | #define IS_TNODE(n) (!(n->parent & T_LEAF)) |
96 | #define IS_LEAF(n) (n->parent & T_LEAF) | |
19baf839 RO |
97 | |
98 | struct node { | |
91b9a277 | 99 | unsigned long parent; |
8d965444 | 100 | t_key key; |
19baf839 RO |
101 | }; |
102 | ||
103 | struct leaf { | |
91b9a277 | 104 | unsigned long parent; |
8d965444 | 105 | t_key key; |
19baf839 | 106 | struct hlist_head list; |
2373ce1c | 107 | struct rcu_head rcu; |
19baf839 RO |
108 | }; |
109 | ||
110 | struct leaf_info { | |
111 | struct hlist_node hlist; | |
2373ce1c | 112 | struct rcu_head rcu; |
19baf839 RO |
113 | int plen; |
114 | struct list_head falh; | |
115 | }; | |
116 | ||
117 | struct tnode { | |
91b9a277 | 118 | unsigned long parent; |
8d965444 | 119 | t_key key; |
112d8cfc ED |
120 | unsigned char pos; /* 2log(KEYLENGTH) bits needed */ |
121 | unsigned char bits; /* 2log(KEYLENGTH) bits needed */ | |
8d965444 ED |
122 | unsigned int full_children; /* KEYLENGTH bits needed */ |
123 | unsigned int empty_children; /* KEYLENGTH bits needed */ | |
15be75cd SH |
124 | union { |
125 | struct rcu_head rcu; | |
126 | struct work_struct work; | |
e0f7cb8c | 127 | struct tnode *tnode_free; |
15be75cd | 128 | }; |
91b9a277 | 129 | struct node *child[0]; |
19baf839 RO |
130 | }; |
131 | ||
132 | #ifdef CONFIG_IP_FIB_TRIE_STATS | |
133 | struct trie_use_stats { | |
134 | unsigned int gets; | |
135 | unsigned int backtrack; | |
136 | unsigned int semantic_match_passed; | |
137 | unsigned int semantic_match_miss; | |
138 | unsigned int null_node_hit; | |
2f36895a | 139 | unsigned int resize_node_skipped; |
19baf839 RO |
140 | }; |
141 | #endif | |
142 | ||
143 | struct trie_stat { | |
144 | unsigned int totdepth; | |
145 | unsigned int maxdepth; | |
146 | unsigned int tnodes; | |
147 | unsigned int leaves; | |
148 | unsigned int nullpointers; | |
93672292 | 149 | unsigned int prefixes; |
06ef921d | 150 | unsigned int nodesizes[MAX_STAT_DEPTH]; |
c877efb2 | 151 | }; |
19baf839 RO |
152 | |
153 | struct trie { | |
91b9a277 | 154 | struct node *trie; |
19baf839 RO |
155 | #ifdef CONFIG_IP_FIB_TRIE_STATS |
156 | struct trie_use_stats stats; | |
157 | #endif | |
19baf839 RO |
158 | }; |
159 | ||
19baf839 | 160 | static void put_child(struct trie *t, struct tnode *tn, int i, struct node *n); |
a07f5f50 SH |
161 | static void tnode_put_child_reorg(struct tnode *tn, int i, struct node *n, |
162 | int wasfull); | |
19baf839 | 163 | static struct node *resize(struct trie *t, struct tnode *tn); |
2f80b3c8 RO |
164 | static struct tnode *inflate(struct trie *t, struct tnode *tn); |
165 | static struct tnode *halve(struct trie *t, struct tnode *tn); | |
e0f7cb8c JP |
166 | /* tnodes to free after resize(); protected by RTNL */ |
167 | static struct tnode *tnode_free_head; | |
c3059477 JP |
168 | static size_t tnode_free_size; |
169 | ||
170 | /* | |
171 | * synchronize_rcu after call_rcu for that many pages; it should be especially | |
172 | * useful before resizing the root node with PREEMPT_NONE configs; the value was | |
173 | * obtained experimentally, aiming to avoid visible slowdown. | |
174 | */ | |
175 | static const int sync_pages = 128; | |
19baf839 | 176 | |
e18b890b | 177 | static struct kmem_cache *fn_alias_kmem __read_mostly; |
bc3c8c1e | 178 | static struct kmem_cache *trie_leaf_kmem __read_mostly; |
19baf839 | 179 | |
06801916 SH |
180 | static inline struct tnode *node_parent(struct node *node) |
181 | { | |
b59cfbf7 ED |
182 | return (struct tnode *)(node->parent & ~NODE_TYPE_MASK); |
183 | } | |
184 | ||
185 | static inline struct tnode *node_parent_rcu(struct node *node) | |
186 | { | |
187 | struct tnode *ret = node_parent(node); | |
06801916 | 188 | |
f6b085b6 JP |
189 | return rcu_dereference_check(ret, |
190 | rcu_read_lock_held() || | |
191 | lockdep_rtnl_is_held()); | |
06801916 SH |
192 | } |
193 | ||
6440cc9e SH |
194 | /* Same as rcu_assign_pointer |
195 | * but that macro() assumes that value is a pointer. | |
196 | */ | |
06801916 SH |
197 | static inline void node_set_parent(struct node *node, struct tnode *ptr) |
198 | { | |
6440cc9e SH |
199 | smp_wmb(); |
200 | node->parent = (unsigned long)ptr | NODE_TYPE(node); | |
06801916 | 201 | } |
2373ce1c | 202 | |
b59cfbf7 ED |
203 | static inline struct node *tnode_get_child(struct tnode *tn, unsigned int i) |
204 | { | |
205 | BUG_ON(i >= 1U << tn->bits); | |
2373ce1c | 206 | |
b59cfbf7 ED |
207 | return tn->child[i]; |
208 | } | |
209 | ||
210 | static inline struct node *tnode_get_child_rcu(struct tnode *tn, unsigned int i) | |
19baf839 | 211 | { |
b59cfbf7 | 212 | struct node *ret = tnode_get_child(tn, i); |
19baf839 | 213 | |
4eaa0e3c ED |
214 | return rcu_dereference_check(ret, |
215 | rcu_read_lock_held() || | |
216 | lockdep_rtnl_is_held()); | |
19baf839 RO |
217 | } |
218 | ||
bb435b8d | 219 | static inline int tnode_child_length(const struct tnode *tn) |
19baf839 | 220 | { |
91b9a277 | 221 | return 1 << tn->bits; |
19baf839 RO |
222 | } |
223 | ||
ab66b4a7 SH |
224 | static inline t_key mask_pfx(t_key k, unsigned short l) |
225 | { | |
226 | return (l == 0) ? 0 : k >> (KEYLENGTH-l) << (KEYLENGTH-l); | |
227 | } | |
228 | ||
19baf839 RO |
229 | static inline t_key tkey_extract_bits(t_key a, int offset, int bits) |
230 | { | |
91b9a277 | 231 | if (offset < KEYLENGTH) |
19baf839 | 232 | return ((t_key)(a << offset)) >> (KEYLENGTH - bits); |
91b9a277 | 233 | else |
19baf839 RO |
234 | return 0; |
235 | } | |
236 | ||
237 | static inline int tkey_equals(t_key a, t_key b) | |
238 | { | |
c877efb2 | 239 | return a == b; |
19baf839 RO |
240 | } |
241 | ||
242 | static inline int tkey_sub_equals(t_key a, int offset, int bits, t_key b) | |
243 | { | |
c877efb2 SH |
244 | if (bits == 0 || offset >= KEYLENGTH) |
245 | return 1; | |
91b9a277 OJ |
246 | bits = bits > KEYLENGTH ? KEYLENGTH : bits; |
247 | return ((a ^ b) << offset) >> (KEYLENGTH - bits) == 0; | |
c877efb2 | 248 | } |
19baf839 RO |
249 | |
250 | static inline int tkey_mismatch(t_key a, int offset, t_key b) | |
251 | { | |
252 | t_key diff = a ^ b; | |
253 | int i = offset; | |
254 | ||
c877efb2 SH |
255 | if (!diff) |
256 | return 0; | |
257 | while ((diff << i) >> (KEYLENGTH-1) == 0) | |
19baf839 RO |
258 | i++; |
259 | return i; | |
260 | } | |
261 | ||
19baf839 | 262 | /* |
e905a9ed YH |
263 | To understand this stuff, an understanding of keys and all their bits is |
264 | necessary. Every node in the trie has a key associated with it, but not | |
19baf839 RO |
265 | all of the bits in that key are significant. |
266 | ||
267 | Consider a node 'n' and its parent 'tp'. | |
268 | ||
e905a9ed YH |
269 | If n is a leaf, every bit in its key is significant. Its presence is |
270 | necessitated by path compression, since during a tree traversal (when | |
271 | searching for a leaf - unless we are doing an insertion) we will completely | |
272 | ignore all skipped bits we encounter. Thus we need to verify, at the end of | |
273 | a potentially successful search, that we have indeed been walking the | |
19baf839 RO |
274 | correct key path. |
275 | ||
e905a9ed YH |
276 | Note that we can never "miss" the correct key in the tree if present by |
277 | following the wrong path. Path compression ensures that segments of the key | |
278 | that are the same for all keys with a given prefix are skipped, but the | |
279 | skipped part *is* identical for each node in the subtrie below the skipped | |
280 | bit! trie_insert() in this implementation takes care of that - note the | |
19baf839 RO |
281 | call to tkey_sub_equals() in trie_insert(). |
282 | ||
e905a9ed | 283 | if n is an internal node - a 'tnode' here, the various parts of its key |
19baf839 RO |
284 | have many different meanings. |
285 | ||
e905a9ed | 286 | Example: |
19baf839 RO |
287 | _________________________________________________________________ |
288 | | i | i | i | i | i | i | i | N | N | N | S | S | S | S | S | C | | |
289 | ----------------------------------------------------------------- | |
e905a9ed | 290 | 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 |
19baf839 RO |
291 | |
292 | _________________________________________________________________ | |
293 | | C | C | C | u | u | u | u | u | u | u | u | u | u | u | u | u | | |
294 | ----------------------------------------------------------------- | |
295 | 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 | |
296 | ||
297 | tp->pos = 7 | |
298 | tp->bits = 3 | |
299 | n->pos = 15 | |
91b9a277 | 300 | n->bits = 4 |
19baf839 | 301 | |
e905a9ed YH |
302 | First, let's just ignore the bits that come before the parent tp, that is |
303 | the bits from 0 to (tp->pos-1). They are *known* but at this point we do | |
19baf839 RO |
304 | not use them for anything. |
305 | ||
306 | The bits from (tp->pos) to (tp->pos + tp->bits - 1) - "N", above - are the | |
e905a9ed | 307 | index into the parent's child array. That is, they will be used to find |
19baf839 RO |
308 | 'n' among tp's children. |
309 | ||
310 | The bits from (tp->pos + tp->bits) to (n->pos - 1) - "S" - are skipped bits | |
311 | for the node n. | |
312 | ||
e905a9ed | 313 | All the bits we have seen so far are significant to the node n. The rest |
19baf839 RO |
314 | of the bits are really not needed or indeed known in n->key. |
315 | ||
e905a9ed | 316 | The bits from (n->pos) to (n->pos + n->bits - 1) - "C" - are the index into |
19baf839 | 317 | n's child array, and will of course be different for each child. |
e905a9ed | 318 | |
c877efb2 | 319 | |
19baf839 RO |
320 | The rest of the bits, from (n->pos + n->bits) onward, are completely unknown |
321 | at this point. | |
322 | ||
323 | */ | |
324 | ||
0c7770c7 | 325 | static inline void check_tnode(const struct tnode *tn) |
19baf839 | 326 | { |
0c7770c7 | 327 | WARN_ON(tn && tn->pos+tn->bits > 32); |
19baf839 RO |
328 | } |
329 | ||
f5026fab DL |
330 | static const int halve_threshold = 25; |
331 | static const int inflate_threshold = 50; | |
345aa031 | 332 | static const int halve_threshold_root = 15; |
80b71b80 | 333 | static const int inflate_threshold_root = 30; |
2373ce1c RO |
334 | |
335 | static void __alias_free_mem(struct rcu_head *head) | |
19baf839 | 336 | { |
2373ce1c RO |
337 | struct fib_alias *fa = container_of(head, struct fib_alias, rcu); |
338 | kmem_cache_free(fn_alias_kmem, fa); | |
19baf839 RO |
339 | } |
340 | ||
2373ce1c | 341 | static inline void alias_free_mem_rcu(struct fib_alias *fa) |
19baf839 | 342 | { |
2373ce1c RO |
343 | call_rcu(&fa->rcu, __alias_free_mem); |
344 | } | |
91b9a277 | 345 | |
2373ce1c RO |
346 | static void __leaf_free_rcu(struct rcu_head *head) |
347 | { | |
bc3c8c1e SH |
348 | struct leaf *l = container_of(head, struct leaf, rcu); |
349 | kmem_cache_free(trie_leaf_kmem, l); | |
2373ce1c | 350 | } |
91b9a277 | 351 | |
387a5487 SH |
352 | static inline void free_leaf(struct leaf *l) |
353 | { | |
354 | call_rcu_bh(&l->rcu, __leaf_free_rcu); | |
355 | } | |
356 | ||
2373ce1c | 357 | static void __leaf_info_free_rcu(struct rcu_head *head) |
19baf839 | 358 | { |
2373ce1c | 359 | kfree(container_of(head, struct leaf_info, rcu)); |
19baf839 RO |
360 | } |
361 | ||
2373ce1c | 362 | static inline void free_leaf_info(struct leaf_info *leaf) |
19baf839 | 363 | { |
2373ce1c | 364 | call_rcu(&leaf->rcu, __leaf_info_free_rcu); |
19baf839 RO |
365 | } |
366 | ||
8d965444 | 367 | static struct tnode *tnode_alloc(size_t size) |
f0e36f8c | 368 | { |
2373ce1c | 369 | if (size <= PAGE_SIZE) |
8d965444 | 370 | return kzalloc(size, GFP_KERNEL); |
15be75cd SH |
371 | else |
372 | return __vmalloc(size, GFP_KERNEL | __GFP_ZERO, PAGE_KERNEL); | |
373 | } | |
2373ce1c | 374 | |
15be75cd SH |
375 | static void __tnode_vfree(struct work_struct *arg) |
376 | { | |
377 | struct tnode *tn = container_of(arg, struct tnode, work); | |
378 | vfree(tn); | |
f0e36f8c PM |
379 | } |
380 | ||
2373ce1c | 381 | static void __tnode_free_rcu(struct rcu_head *head) |
f0e36f8c | 382 | { |
2373ce1c | 383 | struct tnode *tn = container_of(head, struct tnode, rcu); |
8d965444 ED |
384 | size_t size = sizeof(struct tnode) + |
385 | (sizeof(struct node *) << tn->bits); | |
f0e36f8c PM |
386 | |
387 | if (size <= PAGE_SIZE) | |
388 | kfree(tn); | |
15be75cd SH |
389 | else { |
390 | INIT_WORK(&tn->work, __tnode_vfree); | |
391 | schedule_work(&tn->work); | |
392 | } | |
f0e36f8c PM |
393 | } |
394 | ||
2373ce1c RO |
395 | static inline void tnode_free(struct tnode *tn) |
396 | { | |
387a5487 SH |
397 | if (IS_LEAF(tn)) |
398 | free_leaf((struct leaf *) tn); | |
399 | else | |
550e29bc | 400 | call_rcu(&tn->rcu, __tnode_free_rcu); |
2373ce1c RO |
401 | } |
402 | ||
e0f7cb8c JP |
403 | static void tnode_free_safe(struct tnode *tn) |
404 | { | |
405 | BUG_ON(IS_LEAF(tn)); | |
7b85576d JP |
406 | tn->tnode_free = tnode_free_head; |
407 | tnode_free_head = tn; | |
c3059477 JP |
408 | tnode_free_size += sizeof(struct tnode) + |
409 | (sizeof(struct node *) << tn->bits); | |
e0f7cb8c JP |
410 | } |
411 | ||
412 | static void tnode_free_flush(void) | |
413 | { | |
414 | struct tnode *tn; | |
415 | ||
416 | while ((tn = tnode_free_head)) { | |
417 | tnode_free_head = tn->tnode_free; | |
418 | tn->tnode_free = NULL; | |
419 | tnode_free(tn); | |
420 | } | |
c3059477 JP |
421 | |
422 | if (tnode_free_size >= PAGE_SIZE * sync_pages) { | |
423 | tnode_free_size = 0; | |
424 | synchronize_rcu(); | |
425 | } | |
e0f7cb8c JP |
426 | } |
427 | ||
2373ce1c RO |
428 | static struct leaf *leaf_new(void) |
429 | { | |
bc3c8c1e | 430 | struct leaf *l = kmem_cache_alloc(trie_leaf_kmem, GFP_KERNEL); |
2373ce1c RO |
431 | if (l) { |
432 | l->parent = T_LEAF; | |
433 | INIT_HLIST_HEAD(&l->list); | |
434 | } | |
435 | return l; | |
436 | } | |
437 | ||
438 | static struct leaf_info *leaf_info_new(int plen) | |
439 | { | |
440 | struct leaf_info *li = kmalloc(sizeof(struct leaf_info), GFP_KERNEL); | |
441 | if (li) { | |
442 | li->plen = plen; | |
443 | INIT_LIST_HEAD(&li->falh); | |
444 | } | |
445 | return li; | |
446 | } | |
447 | ||
a07f5f50 | 448 | static struct tnode *tnode_new(t_key key, int pos, int bits) |
19baf839 | 449 | { |
8d965444 | 450 | size_t sz = sizeof(struct tnode) + (sizeof(struct node *) << bits); |
f0e36f8c | 451 | struct tnode *tn = tnode_alloc(sz); |
19baf839 | 452 | |
91b9a277 | 453 | if (tn) { |
2373ce1c | 454 | tn->parent = T_TNODE; |
19baf839 RO |
455 | tn->pos = pos; |
456 | tn->bits = bits; | |
457 | tn->key = key; | |
458 | tn->full_children = 0; | |
459 | tn->empty_children = 1<<bits; | |
460 | } | |
c877efb2 | 461 | |
8d965444 ED |
462 | pr_debug("AT %p s=%u %lu\n", tn, (unsigned int) sizeof(struct tnode), |
463 | (unsigned long) (sizeof(struct node) << bits)); | |
19baf839 RO |
464 | return tn; |
465 | } | |
466 | ||
19baf839 RO |
467 | /* |
468 | * Check whether a tnode 'n' is "full", i.e. it is an internal node | |
469 | * and no bits are skipped. See discussion in dyntree paper p. 6 | |
470 | */ | |
471 | ||
bb435b8d | 472 | static inline int tnode_full(const struct tnode *tn, const struct node *n) |
19baf839 | 473 | { |
c877efb2 | 474 | if (n == NULL || IS_LEAF(n)) |
19baf839 RO |
475 | return 0; |
476 | ||
477 | return ((struct tnode *) n)->pos == tn->pos + tn->bits; | |
478 | } | |
479 | ||
a07f5f50 SH |
480 | static inline void put_child(struct trie *t, struct tnode *tn, int i, |
481 | struct node *n) | |
19baf839 RO |
482 | { |
483 | tnode_put_child_reorg(tn, i, n, -1); | |
484 | } | |
485 | ||
c877efb2 | 486 | /* |
19baf839 RO |
487 | * Add a child at position i overwriting the old value. |
488 | * Update the value of full_children and empty_children. | |
489 | */ | |
490 | ||
a07f5f50 SH |
491 | static void tnode_put_child_reorg(struct tnode *tn, int i, struct node *n, |
492 | int wasfull) | |
19baf839 | 493 | { |
2373ce1c | 494 | struct node *chi = tn->child[i]; |
19baf839 RO |
495 | int isfull; |
496 | ||
0c7770c7 SH |
497 | BUG_ON(i >= 1<<tn->bits); |
498 | ||
19baf839 RO |
499 | /* update emptyChildren */ |
500 | if (n == NULL && chi != NULL) | |
501 | tn->empty_children++; | |
502 | else if (n != NULL && chi == NULL) | |
503 | tn->empty_children--; | |
c877efb2 | 504 | |
19baf839 | 505 | /* update fullChildren */ |
91b9a277 | 506 | if (wasfull == -1) |
19baf839 RO |
507 | wasfull = tnode_full(tn, chi); |
508 | ||
509 | isfull = tnode_full(tn, n); | |
c877efb2 | 510 | if (wasfull && !isfull) |
19baf839 | 511 | tn->full_children--; |
c877efb2 | 512 | else if (!wasfull && isfull) |
19baf839 | 513 | tn->full_children++; |
91b9a277 | 514 | |
c877efb2 | 515 | if (n) |
06801916 | 516 | node_set_parent(n, tn); |
19baf839 | 517 | |
2373ce1c | 518 | rcu_assign_pointer(tn->child[i], n); |
19baf839 RO |
519 | } |
520 | ||
80b71b80 | 521 | #define MAX_WORK 10 |
c877efb2 | 522 | static struct node *resize(struct trie *t, struct tnode *tn) |
19baf839 RO |
523 | { |
524 | int i; | |
2f80b3c8 | 525 | struct tnode *old_tn; |
e6308be8 RO |
526 | int inflate_threshold_use; |
527 | int halve_threshold_use; | |
80b71b80 | 528 | int max_work; |
19baf839 | 529 | |
e905a9ed | 530 | if (!tn) |
19baf839 RO |
531 | return NULL; |
532 | ||
0c7770c7 SH |
533 | pr_debug("In tnode_resize %p inflate_threshold=%d threshold=%d\n", |
534 | tn, inflate_threshold, halve_threshold); | |
19baf839 RO |
535 | |
536 | /* No children */ | |
537 | if (tn->empty_children == tnode_child_length(tn)) { | |
e0f7cb8c | 538 | tnode_free_safe(tn); |
19baf839 RO |
539 | return NULL; |
540 | } | |
541 | /* One child */ | |
542 | if (tn->empty_children == tnode_child_length(tn) - 1) | |
80b71b80 | 543 | goto one_child; |
c877efb2 | 544 | /* |
19baf839 RO |
545 | * Double as long as the resulting node has a number of |
546 | * nonempty nodes that are above the threshold. | |
547 | */ | |
548 | ||
549 | /* | |
c877efb2 SH |
550 | * From "Implementing a dynamic compressed trie" by Stefan Nilsson of |
551 | * the Helsinki University of Technology and Matti Tikkanen of Nokia | |
19baf839 | 552 | * Telecommunications, page 6: |
c877efb2 | 553 | * "A node is doubled if the ratio of non-empty children to all |
19baf839 RO |
554 | * children in the *doubled* node is at least 'high'." |
555 | * | |
c877efb2 SH |
556 | * 'high' in this instance is the variable 'inflate_threshold'. It |
557 | * is expressed as a percentage, so we multiply it with | |
558 | * tnode_child_length() and instead of multiplying by 2 (since the | |
559 | * child array will be doubled by inflate()) and multiplying | |
560 | * the left-hand side by 100 (to handle the percentage thing) we | |
19baf839 | 561 | * multiply the left-hand side by 50. |
c877efb2 SH |
562 | * |
563 | * The left-hand side may look a bit weird: tnode_child_length(tn) | |
564 | * - tn->empty_children is of course the number of non-null children | |
565 | * in the current node. tn->full_children is the number of "full" | |
19baf839 | 566 | * children, that is non-null tnodes with a skip value of 0. |
c877efb2 | 567 | * All of those will be doubled in the resulting inflated tnode, so |
19baf839 | 568 | * we just count them one extra time here. |
c877efb2 | 569 | * |
19baf839 | 570 | * A clearer way to write this would be: |
c877efb2 | 571 | * |
19baf839 | 572 | * to_be_doubled = tn->full_children; |
c877efb2 | 573 | * not_to_be_doubled = tnode_child_length(tn) - tn->empty_children - |
19baf839 RO |
574 | * tn->full_children; |
575 | * | |
576 | * new_child_length = tnode_child_length(tn) * 2; | |
577 | * | |
c877efb2 | 578 | * new_fill_factor = 100 * (not_to_be_doubled + 2*to_be_doubled) / |
19baf839 RO |
579 | * new_child_length; |
580 | * if (new_fill_factor >= inflate_threshold) | |
c877efb2 SH |
581 | * |
582 | * ...and so on, tho it would mess up the while () loop. | |
583 | * | |
19baf839 RO |
584 | * anyway, |
585 | * 100 * (not_to_be_doubled + 2*to_be_doubled) / new_child_length >= | |
586 | * inflate_threshold | |
c877efb2 | 587 | * |
19baf839 RO |
588 | * avoid a division: |
589 | * 100 * (not_to_be_doubled + 2*to_be_doubled) >= | |
590 | * inflate_threshold * new_child_length | |
c877efb2 | 591 | * |
19baf839 | 592 | * expand not_to_be_doubled and to_be_doubled, and shorten: |
c877efb2 | 593 | * 100 * (tnode_child_length(tn) - tn->empty_children + |
91b9a277 | 594 | * tn->full_children) >= inflate_threshold * new_child_length |
c877efb2 | 595 | * |
19baf839 | 596 | * expand new_child_length: |
c877efb2 | 597 | * 100 * (tnode_child_length(tn) - tn->empty_children + |
91b9a277 | 598 | * tn->full_children) >= |
19baf839 | 599 | * inflate_threshold * tnode_child_length(tn) * 2 |
c877efb2 | 600 | * |
19baf839 | 601 | * shorten again: |
c877efb2 | 602 | * 50 * (tn->full_children + tnode_child_length(tn) - |
91b9a277 | 603 | * tn->empty_children) >= inflate_threshold * |
19baf839 | 604 | * tnode_child_length(tn) |
c877efb2 | 605 | * |
19baf839 RO |
606 | */ |
607 | ||
608 | check_tnode(tn); | |
c877efb2 | 609 | |
e6308be8 RO |
610 | /* Keep root node larger */ |
611 | ||
80b71b80 JL |
612 | if (!node_parent((struct node*) tn)) { |
613 | inflate_threshold_use = inflate_threshold_root; | |
614 | halve_threshold_use = halve_threshold_root; | |
615 | } | |
616 | else { | |
e6308be8 | 617 | inflate_threshold_use = inflate_threshold; |
80b71b80 JL |
618 | halve_threshold_use = halve_threshold; |
619 | } | |
e6308be8 | 620 | |
80b71b80 JL |
621 | max_work = MAX_WORK; |
622 | while ((tn->full_children > 0 && max_work-- && | |
a07f5f50 SH |
623 | 50 * (tn->full_children + tnode_child_length(tn) |
624 | - tn->empty_children) | |
625 | >= inflate_threshold_use * tnode_child_length(tn))) { | |
19baf839 | 626 | |
2f80b3c8 RO |
627 | old_tn = tn; |
628 | tn = inflate(t, tn); | |
a07f5f50 | 629 | |
2f80b3c8 RO |
630 | if (IS_ERR(tn)) { |
631 | tn = old_tn; | |
2f36895a RO |
632 | #ifdef CONFIG_IP_FIB_TRIE_STATS |
633 | t->stats.resize_node_skipped++; | |
634 | #endif | |
635 | break; | |
636 | } | |
19baf839 RO |
637 | } |
638 | ||
639 | check_tnode(tn); | |
640 | ||
80b71b80 JL |
641 | /* Return if at least one inflate is run */ |
642 | if( max_work != MAX_WORK) | |
643 | return (struct node *) tn; | |
644 | ||
19baf839 RO |
645 | /* |
646 | * Halve as long as the number of empty children in this | |
647 | * node is above threshold. | |
648 | */ | |
2f36895a | 649 | |
80b71b80 JL |
650 | max_work = MAX_WORK; |
651 | while (tn->bits > 1 && max_work-- && | |
19baf839 | 652 | 100 * (tnode_child_length(tn) - tn->empty_children) < |
e6308be8 | 653 | halve_threshold_use * tnode_child_length(tn)) { |
2f36895a | 654 | |
2f80b3c8 RO |
655 | old_tn = tn; |
656 | tn = halve(t, tn); | |
657 | if (IS_ERR(tn)) { | |
658 | tn = old_tn; | |
2f36895a RO |
659 | #ifdef CONFIG_IP_FIB_TRIE_STATS |
660 | t->stats.resize_node_skipped++; | |
661 | #endif | |
662 | break; | |
663 | } | |
664 | } | |
19baf839 | 665 | |
c877efb2 | 666 | |
19baf839 | 667 | /* Only one child remains */ |
80b71b80 JL |
668 | if (tn->empty_children == tnode_child_length(tn) - 1) { |
669 | one_child: | |
19baf839 | 670 | for (i = 0; i < tnode_child_length(tn); i++) { |
91b9a277 | 671 | struct node *n; |
19baf839 | 672 | |
91b9a277 | 673 | n = tn->child[i]; |
2373ce1c | 674 | if (!n) |
91b9a277 | 675 | continue; |
91b9a277 OJ |
676 | |
677 | /* compress one level */ | |
678 | ||
06801916 | 679 | node_set_parent(n, NULL); |
e0f7cb8c | 680 | tnode_free_safe(tn); |
91b9a277 | 681 | return n; |
19baf839 | 682 | } |
80b71b80 | 683 | } |
19baf839 RO |
684 | return (struct node *) tn; |
685 | } | |
686 | ||
2f80b3c8 | 687 | static struct tnode *inflate(struct trie *t, struct tnode *tn) |
19baf839 | 688 | { |
19baf839 RO |
689 | struct tnode *oldtnode = tn; |
690 | int olen = tnode_child_length(tn); | |
691 | int i; | |
692 | ||
0c7770c7 | 693 | pr_debug("In inflate\n"); |
19baf839 RO |
694 | |
695 | tn = tnode_new(oldtnode->key, oldtnode->pos, oldtnode->bits + 1); | |
696 | ||
0c7770c7 | 697 | if (!tn) |
2f80b3c8 | 698 | return ERR_PTR(-ENOMEM); |
2f36895a RO |
699 | |
700 | /* | |
c877efb2 SH |
701 | * Preallocate and store tnodes before the actual work so we |
702 | * don't get into an inconsistent state if memory allocation | |
703 | * fails. In case of failure we return the oldnode and inflate | |
2f36895a RO |
704 | * of tnode is ignored. |
705 | */ | |
91b9a277 OJ |
706 | |
707 | for (i = 0; i < olen; i++) { | |
a07f5f50 | 708 | struct tnode *inode; |
2f36895a | 709 | |
a07f5f50 | 710 | inode = (struct tnode *) tnode_get_child(oldtnode, i); |
2f36895a RO |
711 | if (inode && |
712 | IS_TNODE(inode) && | |
713 | inode->pos == oldtnode->pos + oldtnode->bits && | |
714 | inode->bits > 1) { | |
715 | struct tnode *left, *right; | |
ab66b4a7 | 716 | t_key m = ~0U << (KEYLENGTH - 1) >> inode->pos; |
c877efb2 | 717 | |
2f36895a RO |
718 | left = tnode_new(inode->key&(~m), inode->pos + 1, |
719 | inode->bits - 1); | |
2f80b3c8 RO |
720 | if (!left) |
721 | goto nomem; | |
91b9a277 | 722 | |
2f36895a RO |
723 | right = tnode_new(inode->key|m, inode->pos + 1, |
724 | inode->bits - 1); | |
725 | ||
e905a9ed | 726 | if (!right) { |
2f80b3c8 RO |
727 | tnode_free(left); |
728 | goto nomem; | |
e905a9ed | 729 | } |
2f36895a RO |
730 | |
731 | put_child(t, tn, 2*i, (struct node *) left); | |
732 | put_child(t, tn, 2*i+1, (struct node *) right); | |
733 | } | |
734 | } | |
735 | ||
91b9a277 | 736 | for (i = 0; i < olen; i++) { |
c95aaf9a | 737 | struct tnode *inode; |
19baf839 | 738 | struct node *node = tnode_get_child(oldtnode, i); |
91b9a277 OJ |
739 | struct tnode *left, *right; |
740 | int size, j; | |
c877efb2 | 741 | |
19baf839 RO |
742 | /* An empty child */ |
743 | if (node == NULL) | |
744 | continue; | |
745 | ||
746 | /* A leaf or an internal node with skipped bits */ | |
747 | ||
c877efb2 | 748 | if (IS_LEAF(node) || ((struct tnode *) node)->pos > |
19baf839 | 749 | tn->pos + tn->bits - 1) { |
a07f5f50 SH |
750 | if (tkey_extract_bits(node->key, |
751 | oldtnode->pos + oldtnode->bits, | |
752 | 1) == 0) | |
19baf839 RO |
753 | put_child(t, tn, 2*i, node); |
754 | else | |
755 | put_child(t, tn, 2*i+1, node); | |
756 | continue; | |
757 | } | |
758 | ||
759 | /* An internal node with two children */ | |
760 | inode = (struct tnode *) node; | |
761 | ||
762 | if (inode->bits == 1) { | |
763 | put_child(t, tn, 2*i, inode->child[0]); | |
764 | put_child(t, tn, 2*i+1, inode->child[1]); | |
765 | ||
e0f7cb8c | 766 | tnode_free_safe(inode); |
91b9a277 | 767 | continue; |
19baf839 RO |
768 | } |
769 | ||
91b9a277 OJ |
770 | /* An internal node with more than two children */ |
771 | ||
772 | /* We will replace this node 'inode' with two new | |
773 | * ones, 'left' and 'right', each with half of the | |
774 | * original children. The two new nodes will have | |
775 | * a position one bit further down the key and this | |
776 | * means that the "significant" part of their keys | |
777 | * (see the discussion near the top of this file) | |
778 | * will differ by one bit, which will be "0" in | |
779 | * left's key and "1" in right's key. Since we are | |
780 | * moving the key position by one step, the bit that | |
781 | * we are moving away from - the bit at position | |
782 | * (inode->pos) - is the one that will differ between | |
783 | * left and right. So... we synthesize that bit in the | |
784 | * two new keys. | |
785 | * The mask 'm' below will be a single "one" bit at | |
786 | * the position (inode->pos) | |
787 | */ | |
19baf839 | 788 | |
91b9a277 OJ |
789 | /* Use the old key, but set the new significant |
790 | * bit to zero. | |
791 | */ | |
2f36895a | 792 | |
91b9a277 OJ |
793 | left = (struct tnode *) tnode_get_child(tn, 2*i); |
794 | put_child(t, tn, 2*i, NULL); | |
2f36895a | 795 | |
91b9a277 | 796 | BUG_ON(!left); |
2f36895a | 797 | |
91b9a277 OJ |
798 | right = (struct tnode *) tnode_get_child(tn, 2*i+1); |
799 | put_child(t, tn, 2*i+1, NULL); | |
19baf839 | 800 | |
91b9a277 | 801 | BUG_ON(!right); |
19baf839 | 802 | |
91b9a277 OJ |
803 | size = tnode_child_length(left); |
804 | for (j = 0; j < size; j++) { | |
805 | put_child(t, left, j, inode->child[j]); | |
806 | put_child(t, right, j, inode->child[j + size]); | |
19baf839 | 807 | } |
91b9a277 OJ |
808 | put_child(t, tn, 2*i, resize(t, left)); |
809 | put_child(t, tn, 2*i+1, resize(t, right)); | |
810 | ||
e0f7cb8c | 811 | tnode_free_safe(inode); |
19baf839 | 812 | } |
e0f7cb8c | 813 | tnode_free_safe(oldtnode); |
19baf839 | 814 | return tn; |
2f80b3c8 RO |
815 | nomem: |
816 | { | |
817 | int size = tnode_child_length(tn); | |
818 | int j; | |
819 | ||
0c7770c7 | 820 | for (j = 0; j < size; j++) |
2f80b3c8 RO |
821 | if (tn->child[j]) |
822 | tnode_free((struct tnode *)tn->child[j]); | |
823 | ||
824 | tnode_free(tn); | |
0c7770c7 | 825 | |
2f80b3c8 RO |
826 | return ERR_PTR(-ENOMEM); |
827 | } | |
19baf839 RO |
828 | } |
829 | ||
2f80b3c8 | 830 | static struct tnode *halve(struct trie *t, struct tnode *tn) |
19baf839 RO |
831 | { |
832 | struct tnode *oldtnode = tn; | |
833 | struct node *left, *right; | |
834 | int i; | |
835 | int olen = tnode_child_length(tn); | |
836 | ||
0c7770c7 | 837 | pr_debug("In halve\n"); |
c877efb2 SH |
838 | |
839 | tn = tnode_new(oldtnode->key, oldtnode->pos, oldtnode->bits - 1); | |
19baf839 | 840 | |
2f80b3c8 RO |
841 | if (!tn) |
842 | return ERR_PTR(-ENOMEM); | |
2f36895a RO |
843 | |
844 | /* | |
c877efb2 SH |
845 | * Preallocate and store tnodes before the actual work so we |
846 | * don't get into an inconsistent state if memory allocation | |
847 | * fails. In case of failure we return the oldnode and halve | |
2f36895a RO |
848 | * of tnode is ignored. |
849 | */ | |
850 | ||
91b9a277 | 851 | for (i = 0; i < olen; i += 2) { |
2f36895a RO |
852 | left = tnode_get_child(oldtnode, i); |
853 | right = tnode_get_child(oldtnode, i+1); | |
c877efb2 | 854 | |
2f36895a | 855 | /* Two nonempty children */ |
0c7770c7 | 856 | if (left && right) { |
2f80b3c8 | 857 | struct tnode *newn; |
0c7770c7 | 858 | |
2f80b3c8 | 859 | newn = tnode_new(left->key, tn->pos + tn->bits, 1); |
0c7770c7 SH |
860 | |
861 | if (!newn) | |
2f80b3c8 | 862 | goto nomem; |
0c7770c7 | 863 | |
2f80b3c8 | 864 | put_child(t, tn, i/2, (struct node *)newn); |
2f36895a | 865 | } |
2f36895a | 866 | |
2f36895a | 867 | } |
19baf839 | 868 | |
91b9a277 OJ |
869 | for (i = 0; i < olen; i += 2) { |
870 | struct tnode *newBinNode; | |
871 | ||
19baf839 RO |
872 | left = tnode_get_child(oldtnode, i); |
873 | right = tnode_get_child(oldtnode, i+1); | |
c877efb2 | 874 | |
19baf839 RO |
875 | /* At least one of the children is empty */ |
876 | if (left == NULL) { | |
877 | if (right == NULL) /* Both are empty */ | |
878 | continue; | |
879 | put_child(t, tn, i/2, right); | |
91b9a277 | 880 | continue; |
0c7770c7 | 881 | } |
91b9a277 OJ |
882 | |
883 | if (right == NULL) { | |
19baf839 | 884 | put_child(t, tn, i/2, left); |
91b9a277 OJ |
885 | continue; |
886 | } | |
c877efb2 | 887 | |
19baf839 | 888 | /* Two nonempty children */ |
91b9a277 OJ |
889 | newBinNode = (struct tnode *) tnode_get_child(tn, i/2); |
890 | put_child(t, tn, i/2, NULL); | |
91b9a277 OJ |
891 | put_child(t, newBinNode, 0, left); |
892 | put_child(t, newBinNode, 1, right); | |
893 | put_child(t, tn, i/2, resize(t, newBinNode)); | |
19baf839 | 894 | } |
e0f7cb8c | 895 | tnode_free_safe(oldtnode); |
19baf839 | 896 | return tn; |
2f80b3c8 RO |
897 | nomem: |
898 | { | |
899 | int size = tnode_child_length(tn); | |
900 | int j; | |
901 | ||
0c7770c7 | 902 | for (j = 0; j < size; j++) |
2f80b3c8 RO |
903 | if (tn->child[j]) |
904 | tnode_free((struct tnode *)tn->child[j]); | |
905 | ||
906 | tnode_free(tn); | |
0c7770c7 | 907 | |
2f80b3c8 RO |
908 | return ERR_PTR(-ENOMEM); |
909 | } | |
19baf839 RO |
910 | } |
911 | ||
772cb712 | 912 | /* readside must use rcu_read_lock currently dump routines |
2373ce1c RO |
913 | via get_fa_head and dump */ |
914 | ||
772cb712 | 915 | static struct leaf_info *find_leaf_info(struct leaf *l, int plen) |
19baf839 | 916 | { |
772cb712 | 917 | struct hlist_head *head = &l->list; |
19baf839 RO |
918 | struct hlist_node *node; |
919 | struct leaf_info *li; | |
920 | ||
2373ce1c | 921 | hlist_for_each_entry_rcu(li, node, head, hlist) |
c877efb2 | 922 | if (li->plen == plen) |
19baf839 | 923 | return li; |
91b9a277 | 924 | |
19baf839 RO |
925 | return NULL; |
926 | } | |
927 | ||
a07f5f50 | 928 | static inline struct list_head *get_fa_head(struct leaf *l, int plen) |
19baf839 | 929 | { |
772cb712 | 930 | struct leaf_info *li = find_leaf_info(l, plen); |
c877efb2 | 931 | |
91b9a277 OJ |
932 | if (!li) |
933 | return NULL; | |
c877efb2 | 934 | |
91b9a277 | 935 | return &li->falh; |
19baf839 RO |
936 | } |
937 | ||
938 | static void insert_leaf_info(struct hlist_head *head, struct leaf_info *new) | |
939 | { | |
e905a9ed YH |
940 | struct leaf_info *li = NULL, *last = NULL; |
941 | struct hlist_node *node; | |
942 | ||
943 | if (hlist_empty(head)) { | |
944 | hlist_add_head_rcu(&new->hlist, head); | |
945 | } else { | |
946 | hlist_for_each_entry(li, node, head, hlist) { | |
947 | if (new->plen > li->plen) | |
948 | break; | |
949 | ||
950 | last = li; | |
951 | } | |
952 | if (last) | |
953 | hlist_add_after_rcu(&last->hlist, &new->hlist); | |
954 | else | |
955 | hlist_add_before_rcu(&new->hlist, &li->hlist); | |
956 | } | |
19baf839 RO |
957 | } |
958 | ||
2373ce1c RO |
959 | /* rcu_read_lock needs to be hold by caller from readside */ |
960 | ||
19baf839 RO |
961 | static struct leaf * |
962 | fib_find_node(struct trie *t, u32 key) | |
963 | { | |
964 | int pos; | |
965 | struct tnode *tn; | |
966 | struct node *n; | |
967 | ||
968 | pos = 0; | |
634a4b20 PM |
969 | n = rcu_dereference_check(t->trie, |
970 | rcu_read_lock_held() || | |
971 | lockdep_rtnl_is_held()); | |
19baf839 RO |
972 | |
973 | while (n != NULL && NODE_TYPE(n) == T_TNODE) { | |
974 | tn = (struct tnode *) n; | |
91b9a277 | 975 | |
19baf839 | 976 | check_tnode(tn); |
91b9a277 | 977 | |
c877efb2 | 978 | if (tkey_sub_equals(tn->key, pos, tn->pos-pos, key)) { |
91b9a277 | 979 | pos = tn->pos + tn->bits; |
a07f5f50 SH |
980 | n = tnode_get_child_rcu(tn, |
981 | tkey_extract_bits(key, | |
982 | tn->pos, | |
983 | tn->bits)); | |
91b9a277 | 984 | } else |
19baf839 RO |
985 | break; |
986 | } | |
987 | /* Case we have found a leaf. Compare prefixes */ | |
988 | ||
91b9a277 OJ |
989 | if (n != NULL && IS_LEAF(n) && tkey_equals(key, n->key)) |
990 | return (struct leaf *)n; | |
991 | ||
19baf839 RO |
992 | return NULL; |
993 | } | |
994 | ||
7b85576d | 995 | static void trie_rebalance(struct trie *t, struct tnode *tn) |
19baf839 | 996 | { |
19baf839 | 997 | int wasfull; |
3ed18d76 | 998 | t_key cindex, key; |
06801916 | 999 | struct tnode *tp; |
19baf839 | 1000 | |
3ed18d76 RO |
1001 | key = tn->key; |
1002 | ||
06801916 | 1003 | while (tn != NULL && (tp = node_parent((struct node *)tn)) != NULL) { |
19baf839 RO |
1004 | cindex = tkey_extract_bits(key, tp->pos, tp->bits); |
1005 | wasfull = tnode_full(tp, tnode_get_child(tp, cindex)); | |
a07f5f50 SH |
1006 | tn = (struct tnode *) resize(t, (struct tnode *)tn); |
1007 | ||
1008 | tnode_put_child_reorg((struct tnode *)tp, cindex, | |
1009 | (struct node *)tn, wasfull); | |
91b9a277 | 1010 | |
06801916 | 1011 | tp = node_parent((struct node *) tn); |
008440e3 JP |
1012 | if (!tp) |
1013 | rcu_assign_pointer(t->trie, (struct node *)tn); | |
1014 | ||
e0f7cb8c | 1015 | tnode_free_flush(); |
06801916 | 1016 | if (!tp) |
19baf839 | 1017 | break; |
06801916 | 1018 | tn = tp; |
19baf839 | 1019 | } |
06801916 | 1020 | |
19baf839 | 1021 | /* Handle last (top) tnode */ |
7b85576d | 1022 | if (IS_TNODE(tn)) |
a07f5f50 | 1023 | tn = (struct tnode *)resize(t, (struct tnode *)tn); |
19baf839 | 1024 | |
7b85576d JP |
1025 | rcu_assign_pointer(t->trie, (struct node *)tn); |
1026 | tnode_free_flush(); | |
19baf839 RO |
1027 | } |
1028 | ||
2373ce1c RO |
1029 | /* only used from updater-side */ |
1030 | ||
fea86ad8 | 1031 | static struct list_head *fib_insert_node(struct trie *t, u32 key, int plen) |
19baf839 RO |
1032 | { |
1033 | int pos, newpos; | |
1034 | struct tnode *tp = NULL, *tn = NULL; | |
1035 | struct node *n; | |
1036 | struct leaf *l; | |
1037 | int missbit; | |
c877efb2 | 1038 | struct list_head *fa_head = NULL; |
19baf839 RO |
1039 | struct leaf_info *li; |
1040 | t_key cindex; | |
1041 | ||
1042 | pos = 0; | |
c877efb2 | 1043 | n = t->trie; |
19baf839 | 1044 | |
c877efb2 SH |
1045 | /* If we point to NULL, stop. Either the tree is empty and we should |
1046 | * just put a new leaf in if, or we have reached an empty child slot, | |
19baf839 | 1047 | * and we should just put our new leaf in that. |
c877efb2 SH |
1048 | * If we point to a T_TNODE, check if it matches our key. Note that |
1049 | * a T_TNODE might be skipping any number of bits - its 'pos' need | |
19baf839 RO |
1050 | * not be the parent's 'pos'+'bits'! |
1051 | * | |
c877efb2 | 1052 | * If it does match the current key, get pos/bits from it, extract |
19baf839 RO |
1053 | * the index from our key, push the T_TNODE and walk the tree. |
1054 | * | |
1055 | * If it doesn't, we have to replace it with a new T_TNODE. | |
1056 | * | |
c877efb2 SH |
1057 | * If we point to a T_LEAF, it might or might not have the same key |
1058 | * as we do. If it does, just change the value, update the T_LEAF's | |
1059 | * value, and return it. | |
19baf839 RO |
1060 | * If it doesn't, we need to replace it with a T_TNODE. |
1061 | */ | |
1062 | ||
1063 | while (n != NULL && NODE_TYPE(n) == T_TNODE) { | |
1064 | tn = (struct tnode *) n; | |
91b9a277 | 1065 | |
c877efb2 | 1066 | check_tnode(tn); |
91b9a277 | 1067 | |
c877efb2 | 1068 | if (tkey_sub_equals(tn->key, pos, tn->pos-pos, key)) { |
19baf839 | 1069 | tp = tn; |
91b9a277 | 1070 | pos = tn->pos + tn->bits; |
a07f5f50 SH |
1071 | n = tnode_get_child(tn, |
1072 | tkey_extract_bits(key, | |
1073 | tn->pos, | |
1074 | tn->bits)); | |
19baf839 | 1075 | |
06801916 | 1076 | BUG_ON(n && node_parent(n) != tn); |
91b9a277 | 1077 | } else |
19baf839 RO |
1078 | break; |
1079 | } | |
1080 | ||
1081 | /* | |
1082 | * n ----> NULL, LEAF or TNODE | |
1083 | * | |
c877efb2 | 1084 | * tp is n's (parent) ----> NULL or TNODE |
19baf839 RO |
1085 | */ |
1086 | ||
91b9a277 | 1087 | BUG_ON(tp && IS_LEAF(tp)); |
19baf839 RO |
1088 | |
1089 | /* Case 1: n is a leaf. Compare prefixes */ | |
1090 | ||
c877efb2 | 1091 | if (n != NULL && IS_LEAF(n) && tkey_equals(key, n->key)) { |
c95aaf9a | 1092 | l = (struct leaf *) n; |
19baf839 | 1093 | li = leaf_info_new(plen); |
91b9a277 | 1094 | |
fea86ad8 SH |
1095 | if (!li) |
1096 | return NULL; | |
19baf839 RO |
1097 | |
1098 | fa_head = &li->falh; | |
1099 | insert_leaf_info(&l->list, li); | |
1100 | goto done; | |
1101 | } | |
19baf839 RO |
1102 | l = leaf_new(); |
1103 | ||
fea86ad8 SH |
1104 | if (!l) |
1105 | return NULL; | |
19baf839 RO |
1106 | |
1107 | l->key = key; | |
1108 | li = leaf_info_new(plen); | |
1109 | ||
c877efb2 | 1110 | if (!li) { |
387a5487 | 1111 | free_leaf(l); |
fea86ad8 | 1112 | return NULL; |
f835e471 | 1113 | } |
19baf839 RO |
1114 | |
1115 | fa_head = &li->falh; | |
1116 | insert_leaf_info(&l->list, li); | |
1117 | ||
19baf839 | 1118 | if (t->trie && n == NULL) { |
91b9a277 | 1119 | /* Case 2: n is NULL, and will just insert a new leaf */ |
19baf839 | 1120 | |
06801916 | 1121 | node_set_parent((struct node *)l, tp); |
19baf839 | 1122 | |
91b9a277 OJ |
1123 | cindex = tkey_extract_bits(key, tp->pos, tp->bits); |
1124 | put_child(t, (struct tnode *)tp, cindex, (struct node *)l); | |
1125 | } else { | |
1126 | /* Case 3: n is a LEAF or a TNODE and the key doesn't match. */ | |
c877efb2 SH |
1127 | /* |
1128 | * Add a new tnode here | |
19baf839 RO |
1129 | * first tnode need some special handling |
1130 | */ | |
1131 | ||
1132 | if (tp) | |
91b9a277 | 1133 | pos = tp->pos+tp->bits; |
19baf839 | 1134 | else |
91b9a277 OJ |
1135 | pos = 0; |
1136 | ||
c877efb2 | 1137 | if (n) { |
19baf839 RO |
1138 | newpos = tkey_mismatch(key, pos, n->key); |
1139 | tn = tnode_new(n->key, newpos, 1); | |
91b9a277 | 1140 | } else { |
19baf839 | 1141 | newpos = 0; |
c877efb2 | 1142 | tn = tnode_new(key, newpos, 1); /* First tnode */ |
19baf839 | 1143 | } |
19baf839 | 1144 | |
c877efb2 | 1145 | if (!tn) { |
f835e471 | 1146 | free_leaf_info(li); |
387a5487 | 1147 | free_leaf(l); |
fea86ad8 | 1148 | return NULL; |
91b9a277 OJ |
1149 | } |
1150 | ||
06801916 | 1151 | node_set_parent((struct node *)tn, tp); |
19baf839 | 1152 | |
91b9a277 | 1153 | missbit = tkey_extract_bits(key, newpos, 1); |
19baf839 RO |
1154 | put_child(t, tn, missbit, (struct node *)l); |
1155 | put_child(t, tn, 1-missbit, n); | |
1156 | ||
c877efb2 | 1157 | if (tp) { |
19baf839 | 1158 | cindex = tkey_extract_bits(key, tp->pos, tp->bits); |
a07f5f50 SH |
1159 | put_child(t, (struct tnode *)tp, cindex, |
1160 | (struct node *)tn); | |
91b9a277 | 1161 | } else { |
a07f5f50 | 1162 | rcu_assign_pointer(t->trie, (struct node *)tn); |
19baf839 RO |
1163 | tp = tn; |
1164 | } | |
1165 | } | |
91b9a277 OJ |
1166 | |
1167 | if (tp && tp->pos + tp->bits > 32) | |
a07f5f50 SH |
1168 | pr_warning("fib_trie" |
1169 | " tp=%p pos=%d, bits=%d, key=%0x plen=%d\n", | |
1170 | tp, tp->pos, tp->bits, key, plen); | |
91b9a277 | 1171 | |
19baf839 | 1172 | /* Rebalance the trie */ |
2373ce1c | 1173 | |
7b85576d | 1174 | trie_rebalance(t, tp); |
f835e471 | 1175 | done: |
19baf839 RO |
1176 | return fa_head; |
1177 | } | |
1178 | ||
d562f1f8 RO |
1179 | /* |
1180 | * Caller must hold RTNL. | |
1181 | */ | |
16c6cf8b | 1182 | int fib_table_insert(struct fib_table *tb, struct fib_config *cfg) |
19baf839 RO |
1183 | { |
1184 | struct trie *t = (struct trie *) tb->tb_data; | |
1185 | struct fib_alias *fa, *new_fa; | |
c877efb2 | 1186 | struct list_head *fa_head = NULL; |
19baf839 | 1187 | struct fib_info *fi; |
4e902c57 TG |
1188 | int plen = cfg->fc_dst_len; |
1189 | u8 tos = cfg->fc_tos; | |
19baf839 RO |
1190 | u32 key, mask; |
1191 | int err; | |
1192 | struct leaf *l; | |
1193 | ||
1194 | if (plen > 32) | |
1195 | return -EINVAL; | |
1196 | ||
4e902c57 | 1197 | key = ntohl(cfg->fc_dst); |
19baf839 | 1198 | |
2dfe55b4 | 1199 | pr_debug("Insert table=%u %08x/%d\n", tb->tb_id, key, plen); |
19baf839 | 1200 | |
91b9a277 | 1201 | mask = ntohl(inet_make_mask(plen)); |
19baf839 | 1202 | |
c877efb2 | 1203 | if (key & ~mask) |
19baf839 RO |
1204 | return -EINVAL; |
1205 | ||
1206 | key = key & mask; | |
1207 | ||
4e902c57 TG |
1208 | fi = fib_create_info(cfg); |
1209 | if (IS_ERR(fi)) { | |
1210 | err = PTR_ERR(fi); | |
19baf839 | 1211 | goto err; |
4e902c57 | 1212 | } |
19baf839 RO |
1213 | |
1214 | l = fib_find_node(t, key); | |
c877efb2 | 1215 | fa = NULL; |
19baf839 | 1216 | |
c877efb2 | 1217 | if (l) { |
19baf839 RO |
1218 | fa_head = get_fa_head(l, plen); |
1219 | fa = fib_find_alias(fa_head, tos, fi->fib_priority); | |
1220 | } | |
1221 | ||
1222 | /* Now fa, if non-NULL, points to the first fib alias | |
1223 | * with the same keys [prefix,tos,priority], if such key already | |
1224 | * exists or to the node before which we will insert new one. | |
1225 | * | |
1226 | * If fa is NULL, we will need to allocate a new one and | |
1227 | * insert to the head of f. | |
1228 | * | |
1229 | * If f is NULL, no fib node matched the destination key | |
1230 | * and we need to allocate a new one of those as well. | |
1231 | */ | |
1232 | ||
936f6f8e JA |
1233 | if (fa && fa->fa_tos == tos && |
1234 | fa->fa_info->fib_priority == fi->fib_priority) { | |
1235 | struct fib_alias *fa_first, *fa_match; | |
19baf839 RO |
1236 | |
1237 | err = -EEXIST; | |
4e902c57 | 1238 | if (cfg->fc_nlflags & NLM_F_EXCL) |
19baf839 RO |
1239 | goto out; |
1240 | ||
936f6f8e JA |
1241 | /* We have 2 goals: |
1242 | * 1. Find exact match for type, scope, fib_info to avoid | |
1243 | * duplicate routes | |
1244 | * 2. Find next 'fa' (or head), NLM_F_APPEND inserts before it | |
1245 | */ | |
1246 | fa_match = NULL; | |
1247 | fa_first = fa; | |
1248 | fa = list_entry(fa->fa_list.prev, struct fib_alias, fa_list); | |
1249 | list_for_each_entry_continue(fa, fa_head, fa_list) { | |
1250 | if (fa->fa_tos != tos) | |
1251 | break; | |
1252 | if (fa->fa_info->fib_priority != fi->fib_priority) | |
1253 | break; | |
1254 | if (fa->fa_type == cfg->fc_type && | |
1255 | fa->fa_scope == cfg->fc_scope && | |
1256 | fa->fa_info == fi) { | |
1257 | fa_match = fa; | |
1258 | break; | |
1259 | } | |
1260 | } | |
1261 | ||
4e902c57 | 1262 | if (cfg->fc_nlflags & NLM_F_REPLACE) { |
19baf839 RO |
1263 | struct fib_info *fi_drop; |
1264 | u8 state; | |
1265 | ||
936f6f8e JA |
1266 | fa = fa_first; |
1267 | if (fa_match) { | |
1268 | if (fa == fa_match) | |
1269 | err = 0; | |
6725033f | 1270 | goto out; |
936f6f8e | 1271 | } |
2373ce1c | 1272 | err = -ENOBUFS; |
e94b1766 | 1273 | new_fa = kmem_cache_alloc(fn_alias_kmem, GFP_KERNEL); |
2373ce1c RO |
1274 | if (new_fa == NULL) |
1275 | goto out; | |
19baf839 RO |
1276 | |
1277 | fi_drop = fa->fa_info; | |
2373ce1c RO |
1278 | new_fa->fa_tos = fa->fa_tos; |
1279 | new_fa->fa_info = fi; | |
4e902c57 TG |
1280 | new_fa->fa_type = cfg->fc_type; |
1281 | new_fa->fa_scope = cfg->fc_scope; | |
19baf839 | 1282 | state = fa->fa_state; |
936f6f8e | 1283 | new_fa->fa_state = state & ~FA_S_ACCESSED; |
19baf839 | 1284 | |
2373ce1c RO |
1285 | list_replace_rcu(&fa->fa_list, &new_fa->fa_list); |
1286 | alias_free_mem_rcu(fa); | |
19baf839 RO |
1287 | |
1288 | fib_release_info(fi_drop); | |
1289 | if (state & FA_S_ACCESSED) | |
76e6ebfb | 1290 | rt_cache_flush(cfg->fc_nlinfo.nl_net, -1); |
b8f55831 MK |
1291 | rtmsg_fib(RTM_NEWROUTE, htonl(key), new_fa, plen, |
1292 | tb->tb_id, &cfg->fc_nlinfo, NLM_F_REPLACE); | |
19baf839 | 1293 | |
91b9a277 | 1294 | goto succeeded; |
19baf839 RO |
1295 | } |
1296 | /* Error if we find a perfect match which | |
1297 | * uses the same scope, type, and nexthop | |
1298 | * information. | |
1299 | */ | |
936f6f8e JA |
1300 | if (fa_match) |
1301 | goto out; | |
a07f5f50 | 1302 | |
4e902c57 | 1303 | if (!(cfg->fc_nlflags & NLM_F_APPEND)) |
936f6f8e | 1304 | fa = fa_first; |
19baf839 RO |
1305 | } |
1306 | err = -ENOENT; | |
4e902c57 | 1307 | if (!(cfg->fc_nlflags & NLM_F_CREATE)) |
19baf839 RO |
1308 | goto out; |
1309 | ||
1310 | err = -ENOBUFS; | |
e94b1766 | 1311 | new_fa = kmem_cache_alloc(fn_alias_kmem, GFP_KERNEL); |
19baf839 RO |
1312 | if (new_fa == NULL) |
1313 | goto out; | |
1314 | ||
1315 | new_fa->fa_info = fi; | |
1316 | new_fa->fa_tos = tos; | |
4e902c57 TG |
1317 | new_fa->fa_type = cfg->fc_type; |
1318 | new_fa->fa_scope = cfg->fc_scope; | |
19baf839 | 1319 | new_fa->fa_state = 0; |
19baf839 RO |
1320 | /* |
1321 | * Insert new entry to the list. | |
1322 | */ | |
1323 | ||
c877efb2 | 1324 | if (!fa_head) { |
fea86ad8 SH |
1325 | fa_head = fib_insert_node(t, key, plen); |
1326 | if (unlikely(!fa_head)) { | |
1327 | err = -ENOMEM; | |
f835e471 | 1328 | goto out_free_new_fa; |
fea86ad8 | 1329 | } |
f835e471 | 1330 | } |
19baf839 | 1331 | |
2373ce1c RO |
1332 | list_add_tail_rcu(&new_fa->fa_list, |
1333 | (fa ? &fa->fa_list : fa_head)); | |
19baf839 | 1334 | |
76e6ebfb | 1335 | rt_cache_flush(cfg->fc_nlinfo.nl_net, -1); |
4e902c57 | 1336 | rtmsg_fib(RTM_NEWROUTE, htonl(key), new_fa, plen, tb->tb_id, |
b8f55831 | 1337 | &cfg->fc_nlinfo, 0); |
19baf839 RO |
1338 | succeeded: |
1339 | return 0; | |
f835e471 RO |
1340 | |
1341 | out_free_new_fa: | |
1342 | kmem_cache_free(fn_alias_kmem, new_fa); | |
19baf839 RO |
1343 | out: |
1344 | fib_release_info(fi); | |
91b9a277 | 1345 | err: |
19baf839 RO |
1346 | return err; |
1347 | } | |
1348 | ||
772cb712 | 1349 | /* should be called with rcu_read_lock */ |
a07f5f50 SH |
1350 | static int check_leaf(struct trie *t, struct leaf *l, |
1351 | t_key key, const struct flowi *flp, | |
1352 | struct fib_result *res) | |
19baf839 | 1353 | { |
19baf839 RO |
1354 | struct leaf_info *li; |
1355 | struct hlist_head *hhead = &l->list; | |
1356 | struct hlist_node *node; | |
c877efb2 | 1357 | |
2373ce1c | 1358 | hlist_for_each_entry_rcu(li, node, hhead, hlist) { |
a07f5f50 SH |
1359 | int err; |
1360 | int plen = li->plen; | |
1361 | __be32 mask = inet_make_mask(plen); | |
1362 | ||
888454c5 | 1363 | if (l->key != (key & ntohl(mask))) |
19baf839 RO |
1364 | continue; |
1365 | ||
e204a345 | 1366 | err = fib_semantic_match(&li->falh, flp, res, plen); |
a07f5f50 | 1367 | |
19baf839 | 1368 | #ifdef CONFIG_IP_FIB_TRIE_STATS |
a07f5f50 | 1369 | if (err <= 0) |
19baf839 | 1370 | t->stats.semantic_match_passed++; |
a07f5f50 SH |
1371 | else |
1372 | t->stats.semantic_match_miss++; | |
19baf839 | 1373 | #endif |
a07f5f50 | 1374 | if (err <= 0) |
2e655571 | 1375 | return err; |
19baf839 | 1376 | } |
a07f5f50 | 1377 | |
2e655571 | 1378 | return 1; |
19baf839 RO |
1379 | } |
1380 | ||
16c6cf8b SH |
1381 | int fib_table_lookup(struct fib_table *tb, const struct flowi *flp, |
1382 | struct fib_result *res) | |
19baf839 RO |
1383 | { |
1384 | struct trie *t = (struct trie *) tb->tb_data; | |
2e655571 | 1385 | int ret; |
19baf839 RO |
1386 | struct node *n; |
1387 | struct tnode *pn; | |
1388 | int pos, bits; | |
91b9a277 | 1389 | t_key key = ntohl(flp->fl4_dst); |
19baf839 RO |
1390 | int chopped_off; |
1391 | t_key cindex = 0; | |
1392 | int current_prefix_length = KEYLENGTH; | |
91b9a277 OJ |
1393 | struct tnode *cn; |
1394 | t_key node_prefix, key_prefix, pref_mismatch; | |
1395 | int mp; | |
1396 | ||
2373ce1c | 1397 | rcu_read_lock(); |
91b9a277 | 1398 | |
2373ce1c | 1399 | n = rcu_dereference(t->trie); |
c877efb2 | 1400 | if (!n) |
19baf839 RO |
1401 | goto failed; |
1402 | ||
1403 | #ifdef CONFIG_IP_FIB_TRIE_STATS | |
1404 | t->stats.gets++; | |
1405 | #endif | |
1406 | ||
1407 | /* Just a leaf? */ | |
1408 | if (IS_LEAF(n)) { | |
2e655571 | 1409 | ret = check_leaf(t, (struct leaf *)n, key, flp, res); |
a07f5f50 | 1410 | goto found; |
19baf839 | 1411 | } |
a07f5f50 | 1412 | |
19baf839 RO |
1413 | pn = (struct tnode *) n; |
1414 | chopped_off = 0; | |
c877efb2 | 1415 | |
91b9a277 | 1416 | while (pn) { |
19baf839 RO |
1417 | pos = pn->pos; |
1418 | bits = pn->bits; | |
1419 | ||
c877efb2 | 1420 | if (!chopped_off) |
ab66b4a7 SH |
1421 | cindex = tkey_extract_bits(mask_pfx(key, current_prefix_length), |
1422 | pos, bits); | |
19baf839 | 1423 | |
b902e573 | 1424 | n = tnode_get_child_rcu(pn, cindex); |
19baf839 RO |
1425 | |
1426 | if (n == NULL) { | |
1427 | #ifdef CONFIG_IP_FIB_TRIE_STATS | |
1428 | t->stats.null_node_hit++; | |
1429 | #endif | |
1430 | goto backtrace; | |
1431 | } | |
1432 | ||
91b9a277 | 1433 | if (IS_LEAF(n)) { |
2e655571 BH |
1434 | ret = check_leaf(t, (struct leaf *)n, key, flp, res); |
1435 | if (ret > 0) | |
91b9a277 | 1436 | goto backtrace; |
a07f5f50 | 1437 | goto found; |
91b9a277 OJ |
1438 | } |
1439 | ||
91b9a277 | 1440 | cn = (struct tnode *)n; |
19baf839 | 1441 | |
91b9a277 OJ |
1442 | /* |
1443 | * It's a tnode, and we can do some extra checks here if we | |
1444 | * like, to avoid descending into a dead-end branch. | |
1445 | * This tnode is in the parent's child array at index | |
1446 | * key[p_pos..p_pos+p_bits] but potentially with some bits | |
1447 | * chopped off, so in reality the index may be just a | |
1448 | * subprefix, padded with zero at the end. | |
1449 | * We can also take a look at any skipped bits in this | |
1450 | * tnode - everything up to p_pos is supposed to be ok, | |
1451 | * and the non-chopped bits of the index (se previous | |
1452 | * paragraph) are also guaranteed ok, but the rest is | |
1453 | * considered unknown. | |
1454 | * | |
1455 | * The skipped bits are key[pos+bits..cn->pos]. | |
1456 | */ | |
19baf839 | 1457 | |
91b9a277 OJ |
1458 | /* If current_prefix_length < pos+bits, we are already doing |
1459 | * actual prefix matching, which means everything from | |
1460 | * pos+(bits-chopped_off) onward must be zero along some | |
1461 | * branch of this subtree - otherwise there is *no* valid | |
1462 | * prefix present. Here we can only check the skipped | |
1463 | * bits. Remember, since we have already indexed into the | |
1464 | * parent's child array, we know that the bits we chopped of | |
1465 | * *are* zero. | |
1466 | */ | |
19baf839 | 1467 | |
a07f5f50 SH |
1468 | /* NOTA BENE: Checking only skipped bits |
1469 | for the new node here */ | |
19baf839 | 1470 | |
91b9a277 OJ |
1471 | if (current_prefix_length < pos+bits) { |
1472 | if (tkey_extract_bits(cn->key, current_prefix_length, | |
a07f5f50 SH |
1473 | cn->pos - current_prefix_length) |
1474 | || !(cn->child[0])) | |
91b9a277 OJ |
1475 | goto backtrace; |
1476 | } | |
19baf839 | 1477 | |
91b9a277 OJ |
1478 | /* |
1479 | * If chopped_off=0, the index is fully validated and we | |
1480 | * only need to look at the skipped bits for this, the new, | |
1481 | * tnode. What we actually want to do is to find out if | |
1482 | * these skipped bits match our key perfectly, or if we will | |
1483 | * have to count on finding a matching prefix further down, | |
1484 | * because if we do, we would like to have some way of | |
1485 | * verifying the existence of such a prefix at this point. | |
1486 | */ | |
19baf839 | 1487 | |
91b9a277 OJ |
1488 | /* The only thing we can do at this point is to verify that |
1489 | * any such matching prefix can indeed be a prefix to our | |
1490 | * key, and if the bits in the node we are inspecting that | |
1491 | * do not match our key are not ZERO, this cannot be true. | |
1492 | * Thus, find out where there is a mismatch (before cn->pos) | |
1493 | * and verify that all the mismatching bits are zero in the | |
1494 | * new tnode's key. | |
1495 | */ | |
19baf839 | 1496 | |
a07f5f50 SH |
1497 | /* |
1498 | * Note: We aren't very concerned about the piece of | |
1499 | * the key that precede pn->pos+pn->bits, since these | |
1500 | * have already been checked. The bits after cn->pos | |
1501 | * aren't checked since these are by definition | |
1502 | * "unknown" at this point. Thus, what we want to see | |
1503 | * is if we are about to enter the "prefix matching" | |
1504 | * state, and in that case verify that the skipped | |
1505 | * bits that will prevail throughout this subtree are | |
1506 | * zero, as they have to be if we are to find a | |
1507 | * matching prefix. | |
91b9a277 OJ |
1508 | */ |
1509 | ||
ab66b4a7 SH |
1510 | node_prefix = mask_pfx(cn->key, cn->pos); |
1511 | key_prefix = mask_pfx(key, cn->pos); | |
91b9a277 OJ |
1512 | pref_mismatch = key_prefix^node_prefix; |
1513 | mp = 0; | |
1514 | ||
a07f5f50 SH |
1515 | /* |
1516 | * In short: If skipped bits in this node do not match | |
1517 | * the search key, enter the "prefix matching" | |
1518 | * state.directly. | |
91b9a277 OJ |
1519 | */ |
1520 | if (pref_mismatch) { | |
1521 | while (!(pref_mismatch & (1<<(KEYLENGTH-1)))) { | |
1522 | mp++; | |
a07f5f50 | 1523 | pref_mismatch = pref_mismatch << 1; |
91b9a277 OJ |
1524 | } |
1525 | key_prefix = tkey_extract_bits(cn->key, mp, cn->pos-mp); | |
1526 | ||
1527 | if (key_prefix != 0) | |
1528 | goto backtrace; | |
1529 | ||
1530 | if (current_prefix_length >= cn->pos) | |
1531 | current_prefix_length = mp; | |
c877efb2 | 1532 | } |
a07f5f50 | 1533 | |
91b9a277 OJ |
1534 | pn = (struct tnode *)n; /* Descend */ |
1535 | chopped_off = 0; | |
1536 | continue; | |
1537 | ||
19baf839 RO |
1538 | backtrace: |
1539 | chopped_off++; | |
1540 | ||
1541 | /* As zero don't change the child key (cindex) */ | |
a07f5f50 SH |
1542 | while ((chopped_off <= pn->bits) |
1543 | && !(cindex & (1<<(chopped_off-1)))) | |
19baf839 | 1544 | chopped_off++; |
19baf839 RO |
1545 | |
1546 | /* Decrease current_... with bits chopped off */ | |
1547 | if (current_prefix_length > pn->pos + pn->bits - chopped_off) | |
a07f5f50 SH |
1548 | current_prefix_length = pn->pos + pn->bits |
1549 | - chopped_off; | |
91b9a277 | 1550 | |
19baf839 | 1551 | /* |
c877efb2 | 1552 | * Either we do the actual chop off according or if we have |
19baf839 RO |
1553 | * chopped off all bits in this tnode walk up to our parent. |
1554 | */ | |
1555 | ||
91b9a277 | 1556 | if (chopped_off <= pn->bits) { |
19baf839 | 1557 | cindex &= ~(1 << (chopped_off-1)); |
91b9a277 | 1558 | } else { |
b902e573 | 1559 | struct tnode *parent = node_parent_rcu((struct node *) pn); |
06801916 | 1560 | if (!parent) |
19baf839 | 1561 | goto failed; |
91b9a277 | 1562 | |
19baf839 | 1563 | /* Get Child's index */ |
06801916 SH |
1564 | cindex = tkey_extract_bits(pn->key, parent->pos, parent->bits); |
1565 | pn = parent; | |
19baf839 RO |
1566 | chopped_off = 0; |
1567 | ||
1568 | #ifdef CONFIG_IP_FIB_TRIE_STATS | |
1569 | t->stats.backtrack++; | |
1570 | #endif | |
1571 | goto backtrace; | |
c877efb2 | 1572 | } |
19baf839 RO |
1573 | } |
1574 | failed: | |
c877efb2 | 1575 | ret = 1; |
19baf839 | 1576 | found: |
2373ce1c | 1577 | rcu_read_unlock(); |
19baf839 RO |
1578 | return ret; |
1579 | } | |
1580 | ||
9195bef7 SH |
1581 | /* |
1582 | * Remove the leaf and return parent. | |
1583 | */ | |
1584 | static void trie_leaf_remove(struct trie *t, struct leaf *l) | |
19baf839 | 1585 | { |
9195bef7 | 1586 | struct tnode *tp = node_parent((struct node *) l); |
c877efb2 | 1587 | |
9195bef7 | 1588 | pr_debug("entering trie_leaf_remove(%p)\n", l); |
19baf839 | 1589 | |
c877efb2 | 1590 | if (tp) { |
9195bef7 | 1591 | t_key cindex = tkey_extract_bits(l->key, tp->pos, tp->bits); |
19baf839 | 1592 | put_child(t, (struct tnode *)tp, cindex, NULL); |
7b85576d | 1593 | trie_rebalance(t, tp); |
91b9a277 | 1594 | } else |
2373ce1c | 1595 | rcu_assign_pointer(t->trie, NULL); |
19baf839 | 1596 | |
387a5487 | 1597 | free_leaf(l); |
19baf839 RO |
1598 | } |
1599 | ||
d562f1f8 RO |
1600 | /* |
1601 | * Caller must hold RTNL. | |
1602 | */ | |
16c6cf8b | 1603 | int fib_table_delete(struct fib_table *tb, struct fib_config *cfg) |
19baf839 RO |
1604 | { |
1605 | struct trie *t = (struct trie *) tb->tb_data; | |
1606 | u32 key, mask; | |
4e902c57 TG |
1607 | int plen = cfg->fc_dst_len; |
1608 | u8 tos = cfg->fc_tos; | |
19baf839 RO |
1609 | struct fib_alias *fa, *fa_to_delete; |
1610 | struct list_head *fa_head; | |
1611 | struct leaf *l; | |
91b9a277 OJ |
1612 | struct leaf_info *li; |
1613 | ||
c877efb2 | 1614 | if (plen > 32) |
19baf839 RO |
1615 | return -EINVAL; |
1616 | ||
4e902c57 | 1617 | key = ntohl(cfg->fc_dst); |
91b9a277 | 1618 | mask = ntohl(inet_make_mask(plen)); |
19baf839 | 1619 | |
c877efb2 | 1620 | if (key & ~mask) |
19baf839 RO |
1621 | return -EINVAL; |
1622 | ||
1623 | key = key & mask; | |
1624 | l = fib_find_node(t, key); | |
1625 | ||
c877efb2 | 1626 | if (!l) |
19baf839 RO |
1627 | return -ESRCH; |
1628 | ||
1629 | fa_head = get_fa_head(l, plen); | |
1630 | fa = fib_find_alias(fa_head, tos, 0); | |
1631 | ||
1632 | if (!fa) | |
1633 | return -ESRCH; | |
1634 | ||
0c7770c7 | 1635 | pr_debug("Deleting %08x/%d tos=%d t=%p\n", key, plen, tos, t); |
19baf839 RO |
1636 | |
1637 | fa_to_delete = NULL; | |
936f6f8e JA |
1638 | fa = list_entry(fa->fa_list.prev, struct fib_alias, fa_list); |
1639 | list_for_each_entry_continue(fa, fa_head, fa_list) { | |
19baf839 RO |
1640 | struct fib_info *fi = fa->fa_info; |
1641 | ||
1642 | if (fa->fa_tos != tos) | |
1643 | break; | |
1644 | ||
4e902c57 TG |
1645 | if ((!cfg->fc_type || fa->fa_type == cfg->fc_type) && |
1646 | (cfg->fc_scope == RT_SCOPE_NOWHERE || | |
1647 | fa->fa_scope == cfg->fc_scope) && | |
1648 | (!cfg->fc_protocol || | |
1649 | fi->fib_protocol == cfg->fc_protocol) && | |
1650 | fib_nh_match(cfg, fi) == 0) { | |
19baf839 RO |
1651 | fa_to_delete = fa; |
1652 | break; | |
1653 | } | |
1654 | } | |
1655 | ||
91b9a277 OJ |
1656 | if (!fa_to_delete) |
1657 | return -ESRCH; | |
19baf839 | 1658 | |
91b9a277 | 1659 | fa = fa_to_delete; |
4e902c57 | 1660 | rtmsg_fib(RTM_DELROUTE, htonl(key), fa, plen, tb->tb_id, |
b8f55831 | 1661 | &cfg->fc_nlinfo, 0); |
91b9a277 OJ |
1662 | |
1663 | l = fib_find_node(t, key); | |
772cb712 | 1664 | li = find_leaf_info(l, plen); |
19baf839 | 1665 | |
2373ce1c | 1666 | list_del_rcu(&fa->fa_list); |
19baf839 | 1667 | |
91b9a277 | 1668 | if (list_empty(fa_head)) { |
2373ce1c | 1669 | hlist_del_rcu(&li->hlist); |
91b9a277 | 1670 | free_leaf_info(li); |
2373ce1c | 1671 | } |
19baf839 | 1672 | |
91b9a277 | 1673 | if (hlist_empty(&l->list)) |
9195bef7 | 1674 | trie_leaf_remove(t, l); |
19baf839 | 1675 | |
91b9a277 | 1676 | if (fa->fa_state & FA_S_ACCESSED) |
76e6ebfb | 1677 | rt_cache_flush(cfg->fc_nlinfo.nl_net, -1); |
19baf839 | 1678 | |
2373ce1c RO |
1679 | fib_release_info(fa->fa_info); |
1680 | alias_free_mem_rcu(fa); | |
91b9a277 | 1681 | return 0; |
19baf839 RO |
1682 | } |
1683 | ||
ef3660ce | 1684 | static int trie_flush_list(struct list_head *head) |
19baf839 RO |
1685 | { |
1686 | struct fib_alias *fa, *fa_node; | |
1687 | int found = 0; | |
1688 | ||
1689 | list_for_each_entry_safe(fa, fa_node, head, fa_list) { | |
1690 | struct fib_info *fi = fa->fa_info; | |
19baf839 | 1691 | |
2373ce1c RO |
1692 | if (fi && (fi->fib_flags & RTNH_F_DEAD)) { |
1693 | list_del_rcu(&fa->fa_list); | |
1694 | fib_release_info(fa->fa_info); | |
1695 | alias_free_mem_rcu(fa); | |
19baf839 RO |
1696 | found++; |
1697 | } | |
1698 | } | |
1699 | return found; | |
1700 | } | |
1701 | ||
ef3660ce | 1702 | static int trie_flush_leaf(struct leaf *l) |
19baf839 RO |
1703 | { |
1704 | int found = 0; | |
1705 | struct hlist_head *lih = &l->list; | |
1706 | struct hlist_node *node, *tmp; | |
1707 | struct leaf_info *li = NULL; | |
1708 | ||
1709 | hlist_for_each_entry_safe(li, node, tmp, lih, hlist) { | |
ef3660ce | 1710 | found += trie_flush_list(&li->falh); |
19baf839 RO |
1711 | |
1712 | if (list_empty(&li->falh)) { | |
2373ce1c | 1713 | hlist_del_rcu(&li->hlist); |
19baf839 RO |
1714 | free_leaf_info(li); |
1715 | } | |
1716 | } | |
1717 | return found; | |
1718 | } | |
1719 | ||
82cfbb00 SH |
1720 | /* |
1721 | * Scan for the next right leaf starting at node p->child[idx] | |
1722 | * Since we have back pointer, no recursion necessary. | |
1723 | */ | |
1724 | static struct leaf *leaf_walk_rcu(struct tnode *p, struct node *c) | |
19baf839 | 1725 | { |
82cfbb00 SH |
1726 | do { |
1727 | t_key idx; | |
c877efb2 | 1728 | |
c877efb2 | 1729 | if (c) |
82cfbb00 | 1730 | idx = tkey_extract_bits(c->key, p->pos, p->bits) + 1; |
c877efb2 | 1731 | else |
82cfbb00 | 1732 | idx = 0; |
2373ce1c | 1733 | |
82cfbb00 SH |
1734 | while (idx < 1u << p->bits) { |
1735 | c = tnode_get_child_rcu(p, idx++); | |
2373ce1c | 1736 | if (!c) |
91b9a277 OJ |
1737 | continue; |
1738 | ||
82cfbb00 SH |
1739 | if (IS_LEAF(c)) { |
1740 | prefetch(p->child[idx]); | |
1741 | return (struct leaf *) c; | |
19baf839 | 1742 | } |
82cfbb00 SH |
1743 | |
1744 | /* Rescan start scanning in new node */ | |
1745 | p = (struct tnode *) c; | |
1746 | idx = 0; | |
19baf839 | 1747 | } |
82cfbb00 SH |
1748 | |
1749 | /* Node empty, walk back up to parent */ | |
91b9a277 | 1750 | c = (struct node *) p; |
82cfbb00 SH |
1751 | } while ( (p = node_parent_rcu(c)) != NULL); |
1752 | ||
1753 | return NULL; /* Root of trie */ | |
1754 | } | |
1755 | ||
82cfbb00 SH |
1756 | static struct leaf *trie_firstleaf(struct trie *t) |
1757 | { | |
f6b085b6 JP |
1758 | struct tnode *n = (struct tnode *) rcu_dereference_check(t->trie, |
1759 | rcu_read_lock_held() || | |
1760 | lockdep_rtnl_is_held()); | |
82cfbb00 SH |
1761 | |
1762 | if (!n) | |
1763 | return NULL; | |
1764 | ||
1765 | if (IS_LEAF(n)) /* trie is just a leaf */ | |
1766 | return (struct leaf *) n; | |
1767 | ||
1768 | return leaf_walk_rcu(n, NULL); | |
1769 | } | |
1770 | ||
1771 | static struct leaf *trie_nextleaf(struct leaf *l) | |
1772 | { | |
1773 | struct node *c = (struct node *) l; | |
b902e573 | 1774 | struct tnode *p = node_parent_rcu(c); |
82cfbb00 SH |
1775 | |
1776 | if (!p) | |
1777 | return NULL; /* trie with just one leaf */ | |
1778 | ||
1779 | return leaf_walk_rcu(p, c); | |
19baf839 RO |
1780 | } |
1781 | ||
71d67e66 SH |
1782 | static struct leaf *trie_leafindex(struct trie *t, int index) |
1783 | { | |
1784 | struct leaf *l = trie_firstleaf(t); | |
1785 | ||
ec28cf73 | 1786 | while (l && index-- > 0) |
71d67e66 | 1787 | l = trie_nextleaf(l); |
ec28cf73 | 1788 | |
71d67e66 SH |
1789 | return l; |
1790 | } | |
1791 | ||
1792 | ||
d562f1f8 RO |
1793 | /* |
1794 | * Caller must hold RTNL. | |
1795 | */ | |
16c6cf8b | 1796 | int fib_table_flush(struct fib_table *tb) |
19baf839 RO |
1797 | { |
1798 | struct trie *t = (struct trie *) tb->tb_data; | |
9195bef7 | 1799 | struct leaf *l, *ll = NULL; |
82cfbb00 | 1800 | int found = 0; |
19baf839 | 1801 | |
82cfbb00 | 1802 | for (l = trie_firstleaf(t); l; l = trie_nextleaf(l)) { |
ef3660ce | 1803 | found += trie_flush_leaf(l); |
19baf839 RO |
1804 | |
1805 | if (ll && hlist_empty(&ll->list)) | |
9195bef7 | 1806 | trie_leaf_remove(t, ll); |
19baf839 RO |
1807 | ll = l; |
1808 | } | |
1809 | ||
1810 | if (ll && hlist_empty(&ll->list)) | |
9195bef7 | 1811 | trie_leaf_remove(t, ll); |
19baf839 | 1812 | |
0c7770c7 | 1813 | pr_debug("trie_flush found=%d\n", found); |
19baf839 RO |
1814 | return found; |
1815 | } | |
1816 | ||
16c6cf8b SH |
1817 | void fib_table_select_default(struct fib_table *tb, |
1818 | const struct flowi *flp, | |
1819 | struct fib_result *res) | |
19baf839 RO |
1820 | { |
1821 | struct trie *t = (struct trie *) tb->tb_data; | |
1822 | int order, last_idx; | |
1823 | struct fib_info *fi = NULL; | |
1824 | struct fib_info *last_resort; | |
1825 | struct fib_alias *fa = NULL; | |
1826 | struct list_head *fa_head; | |
1827 | struct leaf *l; | |
1828 | ||
1829 | last_idx = -1; | |
1830 | last_resort = NULL; | |
1831 | order = -1; | |
1832 | ||
2373ce1c | 1833 | rcu_read_lock(); |
c877efb2 | 1834 | |
19baf839 | 1835 | l = fib_find_node(t, 0); |
c877efb2 | 1836 | if (!l) |
19baf839 RO |
1837 | goto out; |
1838 | ||
1839 | fa_head = get_fa_head(l, 0); | |
c877efb2 | 1840 | if (!fa_head) |
19baf839 RO |
1841 | goto out; |
1842 | ||
c877efb2 | 1843 | if (list_empty(fa_head)) |
19baf839 RO |
1844 | goto out; |
1845 | ||
2373ce1c | 1846 | list_for_each_entry_rcu(fa, fa_head, fa_list) { |
19baf839 | 1847 | struct fib_info *next_fi = fa->fa_info; |
91b9a277 | 1848 | |
19baf839 RO |
1849 | if (fa->fa_scope != res->scope || |
1850 | fa->fa_type != RTN_UNICAST) | |
1851 | continue; | |
91b9a277 | 1852 | |
19baf839 RO |
1853 | if (next_fi->fib_priority > res->fi->fib_priority) |
1854 | break; | |
1855 | if (!next_fi->fib_nh[0].nh_gw || | |
1856 | next_fi->fib_nh[0].nh_scope != RT_SCOPE_LINK) | |
1857 | continue; | |
1858 | fa->fa_state |= FA_S_ACCESSED; | |
91b9a277 | 1859 | |
19baf839 RO |
1860 | if (fi == NULL) { |
1861 | if (next_fi != res->fi) | |
1862 | break; | |
1863 | } else if (!fib_detect_death(fi, order, &last_resort, | |
971b893e | 1864 | &last_idx, tb->tb_default)) { |
a2bbe682 | 1865 | fib_result_assign(res, fi); |
971b893e | 1866 | tb->tb_default = order; |
19baf839 RO |
1867 | goto out; |
1868 | } | |
1869 | fi = next_fi; | |
1870 | order++; | |
1871 | } | |
1872 | if (order <= 0 || fi == NULL) { | |
971b893e | 1873 | tb->tb_default = -1; |
19baf839 RO |
1874 | goto out; |
1875 | } | |
1876 | ||
971b893e DL |
1877 | if (!fib_detect_death(fi, order, &last_resort, &last_idx, |
1878 | tb->tb_default)) { | |
a2bbe682 | 1879 | fib_result_assign(res, fi); |
971b893e | 1880 | tb->tb_default = order; |
19baf839 RO |
1881 | goto out; |
1882 | } | |
a2bbe682 DL |
1883 | if (last_idx >= 0) |
1884 | fib_result_assign(res, last_resort); | |
971b893e DL |
1885 | tb->tb_default = last_idx; |
1886 | out: | |
2373ce1c | 1887 | rcu_read_unlock(); |
19baf839 RO |
1888 | } |
1889 | ||
a07f5f50 SH |
1890 | static int fn_trie_dump_fa(t_key key, int plen, struct list_head *fah, |
1891 | struct fib_table *tb, | |
19baf839 RO |
1892 | struct sk_buff *skb, struct netlink_callback *cb) |
1893 | { | |
1894 | int i, s_i; | |
1895 | struct fib_alias *fa; | |
32ab5f80 | 1896 | __be32 xkey = htonl(key); |
19baf839 | 1897 | |
71d67e66 | 1898 | s_i = cb->args[5]; |
19baf839 RO |
1899 | i = 0; |
1900 | ||
2373ce1c RO |
1901 | /* rcu_read_lock is hold by caller */ |
1902 | ||
1903 | list_for_each_entry_rcu(fa, fah, fa_list) { | |
19baf839 RO |
1904 | if (i < s_i) { |
1905 | i++; | |
1906 | continue; | |
1907 | } | |
19baf839 RO |
1908 | |
1909 | if (fib_dump_info(skb, NETLINK_CB(cb->skb).pid, | |
1910 | cb->nlh->nlmsg_seq, | |
1911 | RTM_NEWROUTE, | |
1912 | tb->tb_id, | |
1913 | fa->fa_type, | |
1914 | fa->fa_scope, | |
be403ea1 | 1915 | xkey, |
19baf839 RO |
1916 | plen, |
1917 | fa->fa_tos, | |
64347f78 | 1918 | fa->fa_info, NLM_F_MULTI) < 0) { |
71d67e66 | 1919 | cb->args[5] = i; |
19baf839 | 1920 | return -1; |
91b9a277 | 1921 | } |
19baf839 RO |
1922 | i++; |
1923 | } | |
71d67e66 | 1924 | cb->args[5] = i; |
19baf839 RO |
1925 | return skb->len; |
1926 | } | |
1927 | ||
a88ee229 SH |
1928 | static int fn_trie_dump_leaf(struct leaf *l, struct fib_table *tb, |
1929 | struct sk_buff *skb, struct netlink_callback *cb) | |
19baf839 | 1930 | { |
a88ee229 SH |
1931 | struct leaf_info *li; |
1932 | struct hlist_node *node; | |
1933 | int i, s_i; | |
19baf839 | 1934 | |
71d67e66 | 1935 | s_i = cb->args[4]; |
a88ee229 | 1936 | i = 0; |
19baf839 | 1937 | |
a88ee229 SH |
1938 | /* rcu_read_lock is hold by caller */ |
1939 | hlist_for_each_entry_rcu(li, node, &l->list, hlist) { | |
1940 | if (i < s_i) { | |
1941 | i++; | |
19baf839 | 1942 | continue; |
a88ee229 | 1943 | } |
91b9a277 | 1944 | |
a88ee229 | 1945 | if (i > s_i) |
71d67e66 | 1946 | cb->args[5] = 0; |
19baf839 | 1947 | |
a88ee229 | 1948 | if (list_empty(&li->falh)) |
19baf839 RO |
1949 | continue; |
1950 | ||
a88ee229 | 1951 | if (fn_trie_dump_fa(l->key, li->plen, &li->falh, tb, skb, cb) < 0) { |
71d67e66 | 1952 | cb->args[4] = i; |
19baf839 RO |
1953 | return -1; |
1954 | } | |
a88ee229 | 1955 | i++; |
19baf839 | 1956 | } |
a88ee229 | 1957 | |
71d67e66 | 1958 | cb->args[4] = i; |
19baf839 RO |
1959 | return skb->len; |
1960 | } | |
1961 | ||
16c6cf8b SH |
1962 | int fib_table_dump(struct fib_table *tb, struct sk_buff *skb, |
1963 | struct netlink_callback *cb) | |
19baf839 | 1964 | { |
a88ee229 | 1965 | struct leaf *l; |
19baf839 | 1966 | struct trie *t = (struct trie *) tb->tb_data; |
d5ce8a0e | 1967 | t_key key = cb->args[2]; |
71d67e66 | 1968 | int count = cb->args[3]; |
19baf839 | 1969 | |
2373ce1c | 1970 | rcu_read_lock(); |
d5ce8a0e SH |
1971 | /* Dump starting at last key. |
1972 | * Note: 0.0.0.0/0 (ie default) is first key. | |
1973 | */ | |
71d67e66 | 1974 | if (count == 0) |
d5ce8a0e SH |
1975 | l = trie_firstleaf(t); |
1976 | else { | |
71d67e66 SH |
1977 | /* Normally, continue from last key, but if that is missing |
1978 | * fallback to using slow rescan | |
1979 | */ | |
d5ce8a0e | 1980 | l = fib_find_node(t, key); |
71d67e66 SH |
1981 | if (!l) |
1982 | l = trie_leafindex(t, count); | |
d5ce8a0e | 1983 | } |
a88ee229 | 1984 | |
d5ce8a0e SH |
1985 | while (l) { |
1986 | cb->args[2] = l->key; | |
a88ee229 | 1987 | if (fn_trie_dump_leaf(l, tb, skb, cb) < 0) { |
71d67e66 | 1988 | cb->args[3] = count; |
a88ee229 | 1989 | rcu_read_unlock(); |
a88ee229 | 1990 | return -1; |
19baf839 | 1991 | } |
d5ce8a0e | 1992 | |
71d67e66 | 1993 | ++count; |
d5ce8a0e | 1994 | l = trie_nextleaf(l); |
71d67e66 SH |
1995 | memset(&cb->args[4], 0, |
1996 | sizeof(cb->args) - 4*sizeof(cb->args[0])); | |
19baf839 | 1997 | } |
71d67e66 | 1998 | cb->args[3] = count; |
2373ce1c | 1999 | rcu_read_unlock(); |
a88ee229 | 2000 | |
19baf839 | 2001 | return skb->len; |
19baf839 RO |
2002 | } |
2003 | ||
7f9b8052 SH |
2004 | void __init fib_hash_init(void) |
2005 | { | |
a07f5f50 SH |
2006 | fn_alias_kmem = kmem_cache_create("ip_fib_alias", |
2007 | sizeof(struct fib_alias), | |
bc3c8c1e SH |
2008 | 0, SLAB_PANIC, NULL); |
2009 | ||
2010 | trie_leaf_kmem = kmem_cache_create("ip_fib_trie", | |
2011 | max(sizeof(struct leaf), | |
2012 | sizeof(struct leaf_info)), | |
2013 | 0, SLAB_PANIC, NULL); | |
7f9b8052 | 2014 | } |
19baf839 | 2015 | |
7f9b8052 SH |
2016 | |
2017 | /* Fix more generic FIB names for init later */ | |
2018 | struct fib_table *fib_hash_table(u32 id) | |
19baf839 RO |
2019 | { |
2020 | struct fib_table *tb; | |
2021 | struct trie *t; | |
2022 | ||
19baf839 RO |
2023 | tb = kmalloc(sizeof(struct fib_table) + sizeof(struct trie), |
2024 | GFP_KERNEL); | |
2025 | if (tb == NULL) | |
2026 | return NULL; | |
2027 | ||
2028 | tb->tb_id = id; | |
971b893e | 2029 | tb->tb_default = -1; |
19baf839 RO |
2030 | |
2031 | t = (struct trie *) tb->tb_data; | |
c28a1cf4 | 2032 | memset(t, 0, sizeof(*t)); |
19baf839 | 2033 | |
19baf839 | 2034 | if (id == RT_TABLE_LOCAL) |
a07f5f50 | 2035 | pr_info("IPv4 FIB: Using LC-trie version %s\n", VERSION); |
19baf839 RO |
2036 | |
2037 | return tb; | |
2038 | } | |
2039 | ||
cb7b593c SH |
2040 | #ifdef CONFIG_PROC_FS |
2041 | /* Depth first Trie walk iterator */ | |
2042 | struct fib_trie_iter { | |
1c340b2f | 2043 | struct seq_net_private p; |
3d3b2d25 | 2044 | struct fib_table *tb; |
cb7b593c | 2045 | struct tnode *tnode; |
cb7b593c SH |
2046 | unsigned index; |
2047 | unsigned depth; | |
2048 | }; | |
19baf839 | 2049 | |
cb7b593c | 2050 | static struct node *fib_trie_get_next(struct fib_trie_iter *iter) |
19baf839 | 2051 | { |
cb7b593c SH |
2052 | struct tnode *tn = iter->tnode; |
2053 | unsigned cindex = iter->index; | |
2054 | struct tnode *p; | |
19baf839 | 2055 | |
6640e697 EB |
2056 | /* A single entry routing table */ |
2057 | if (!tn) | |
2058 | return NULL; | |
2059 | ||
cb7b593c SH |
2060 | pr_debug("get_next iter={node=%p index=%d depth=%d}\n", |
2061 | iter->tnode, iter->index, iter->depth); | |
2062 | rescan: | |
2063 | while (cindex < (1<<tn->bits)) { | |
b59cfbf7 | 2064 | struct node *n = tnode_get_child_rcu(tn, cindex); |
19baf839 | 2065 | |
cb7b593c SH |
2066 | if (n) { |
2067 | if (IS_LEAF(n)) { | |
2068 | iter->tnode = tn; | |
2069 | iter->index = cindex + 1; | |
2070 | } else { | |
2071 | /* push down one level */ | |
2072 | iter->tnode = (struct tnode *) n; | |
2073 | iter->index = 0; | |
2074 | ++iter->depth; | |
2075 | } | |
2076 | return n; | |
2077 | } | |
19baf839 | 2078 | |
cb7b593c SH |
2079 | ++cindex; |
2080 | } | |
91b9a277 | 2081 | |
cb7b593c | 2082 | /* Current node exhausted, pop back up */ |
b59cfbf7 | 2083 | p = node_parent_rcu((struct node *)tn); |
cb7b593c SH |
2084 | if (p) { |
2085 | cindex = tkey_extract_bits(tn->key, p->pos, p->bits)+1; | |
2086 | tn = p; | |
2087 | --iter->depth; | |
2088 | goto rescan; | |
19baf839 | 2089 | } |
cb7b593c SH |
2090 | |
2091 | /* got root? */ | |
2092 | return NULL; | |
19baf839 RO |
2093 | } |
2094 | ||
cb7b593c SH |
2095 | static struct node *fib_trie_get_first(struct fib_trie_iter *iter, |
2096 | struct trie *t) | |
19baf839 | 2097 | { |
3d3b2d25 | 2098 | struct node *n; |
5ddf0eb2 | 2099 | |
132adf54 | 2100 | if (!t) |
5ddf0eb2 RO |
2101 | return NULL; |
2102 | ||
2103 | n = rcu_dereference(t->trie); | |
3d3b2d25 | 2104 | if (!n) |
5ddf0eb2 | 2105 | return NULL; |
19baf839 | 2106 | |
3d3b2d25 SH |
2107 | if (IS_TNODE(n)) { |
2108 | iter->tnode = (struct tnode *) n; | |
2109 | iter->index = 0; | |
2110 | iter->depth = 1; | |
2111 | } else { | |
2112 | iter->tnode = NULL; | |
2113 | iter->index = 0; | |
2114 | iter->depth = 0; | |
91b9a277 | 2115 | } |
3d3b2d25 SH |
2116 | |
2117 | return n; | |
cb7b593c | 2118 | } |
91b9a277 | 2119 | |
cb7b593c SH |
2120 | static void trie_collect_stats(struct trie *t, struct trie_stat *s) |
2121 | { | |
2122 | struct node *n; | |
2123 | struct fib_trie_iter iter; | |
91b9a277 | 2124 | |
cb7b593c | 2125 | memset(s, 0, sizeof(*s)); |
91b9a277 | 2126 | |
cb7b593c | 2127 | rcu_read_lock(); |
3d3b2d25 | 2128 | for (n = fib_trie_get_first(&iter, t); n; n = fib_trie_get_next(&iter)) { |
cb7b593c | 2129 | if (IS_LEAF(n)) { |
93672292 SH |
2130 | struct leaf *l = (struct leaf *)n; |
2131 | struct leaf_info *li; | |
2132 | struct hlist_node *tmp; | |
2133 | ||
cb7b593c SH |
2134 | s->leaves++; |
2135 | s->totdepth += iter.depth; | |
2136 | if (iter.depth > s->maxdepth) | |
2137 | s->maxdepth = iter.depth; | |
93672292 SH |
2138 | |
2139 | hlist_for_each_entry_rcu(li, tmp, &l->list, hlist) | |
2140 | ++s->prefixes; | |
cb7b593c SH |
2141 | } else { |
2142 | const struct tnode *tn = (const struct tnode *) n; | |
2143 | int i; | |
2144 | ||
2145 | s->tnodes++; | |
132adf54 | 2146 | if (tn->bits < MAX_STAT_DEPTH) |
06ef921d RO |
2147 | s->nodesizes[tn->bits]++; |
2148 | ||
cb7b593c SH |
2149 | for (i = 0; i < (1<<tn->bits); i++) |
2150 | if (!tn->child[i]) | |
2151 | s->nullpointers++; | |
19baf839 | 2152 | } |
19baf839 | 2153 | } |
2373ce1c | 2154 | rcu_read_unlock(); |
19baf839 RO |
2155 | } |
2156 | ||
cb7b593c SH |
2157 | /* |
2158 | * This outputs /proc/net/fib_triestats | |
2159 | */ | |
2160 | static void trie_show_stats(struct seq_file *seq, struct trie_stat *stat) | |
19baf839 | 2161 | { |
cb7b593c | 2162 | unsigned i, max, pointers, bytes, avdepth; |
c877efb2 | 2163 | |
cb7b593c SH |
2164 | if (stat->leaves) |
2165 | avdepth = stat->totdepth*100 / stat->leaves; | |
2166 | else | |
2167 | avdepth = 0; | |
91b9a277 | 2168 | |
a07f5f50 SH |
2169 | seq_printf(seq, "\tAver depth: %u.%02d\n", |
2170 | avdepth / 100, avdepth % 100); | |
cb7b593c | 2171 | seq_printf(seq, "\tMax depth: %u\n", stat->maxdepth); |
91b9a277 | 2172 | |
cb7b593c | 2173 | seq_printf(seq, "\tLeaves: %u\n", stat->leaves); |
cb7b593c | 2174 | bytes = sizeof(struct leaf) * stat->leaves; |
93672292 SH |
2175 | |
2176 | seq_printf(seq, "\tPrefixes: %u\n", stat->prefixes); | |
2177 | bytes += sizeof(struct leaf_info) * stat->prefixes; | |
2178 | ||
187b5188 | 2179 | seq_printf(seq, "\tInternal nodes: %u\n\t", stat->tnodes); |
cb7b593c | 2180 | bytes += sizeof(struct tnode) * stat->tnodes; |
19baf839 | 2181 | |
06ef921d RO |
2182 | max = MAX_STAT_DEPTH; |
2183 | while (max > 0 && stat->nodesizes[max-1] == 0) | |
cb7b593c | 2184 | max--; |
19baf839 | 2185 | |
cb7b593c SH |
2186 | pointers = 0; |
2187 | for (i = 1; i <= max; i++) | |
2188 | if (stat->nodesizes[i] != 0) { | |
187b5188 | 2189 | seq_printf(seq, " %u: %u", i, stat->nodesizes[i]); |
cb7b593c SH |
2190 | pointers += (1<<i) * stat->nodesizes[i]; |
2191 | } | |
2192 | seq_putc(seq, '\n'); | |
187b5188 | 2193 | seq_printf(seq, "\tPointers: %u\n", pointers); |
2373ce1c | 2194 | |
cb7b593c | 2195 | bytes += sizeof(struct node *) * pointers; |
187b5188 SH |
2196 | seq_printf(seq, "Null ptrs: %u\n", stat->nullpointers); |
2197 | seq_printf(seq, "Total size: %u kB\n", (bytes + 1023) / 1024); | |
66a2f7fd | 2198 | } |
2373ce1c | 2199 | |
cb7b593c | 2200 | #ifdef CONFIG_IP_FIB_TRIE_STATS |
66a2f7fd SH |
2201 | static void trie_show_usage(struct seq_file *seq, |
2202 | const struct trie_use_stats *stats) | |
2203 | { | |
2204 | seq_printf(seq, "\nCounters:\n---------\n"); | |
a07f5f50 SH |
2205 | seq_printf(seq, "gets = %u\n", stats->gets); |
2206 | seq_printf(seq, "backtracks = %u\n", stats->backtrack); | |
2207 | seq_printf(seq, "semantic match passed = %u\n", | |
2208 | stats->semantic_match_passed); | |
2209 | seq_printf(seq, "semantic match miss = %u\n", | |
2210 | stats->semantic_match_miss); | |
2211 | seq_printf(seq, "null node hit= %u\n", stats->null_node_hit); | |
2212 | seq_printf(seq, "skipped node resize = %u\n\n", | |
2213 | stats->resize_node_skipped); | |
cb7b593c | 2214 | } |
66a2f7fd SH |
2215 | #endif /* CONFIG_IP_FIB_TRIE_STATS */ |
2216 | ||
3d3b2d25 | 2217 | static void fib_table_print(struct seq_file *seq, struct fib_table *tb) |
d717a9a6 | 2218 | { |
3d3b2d25 SH |
2219 | if (tb->tb_id == RT_TABLE_LOCAL) |
2220 | seq_puts(seq, "Local:\n"); | |
2221 | else if (tb->tb_id == RT_TABLE_MAIN) | |
2222 | seq_puts(seq, "Main:\n"); | |
2223 | else | |
2224 | seq_printf(seq, "Id %d:\n", tb->tb_id); | |
d717a9a6 | 2225 | } |
19baf839 | 2226 | |
3d3b2d25 | 2227 | |
cb7b593c SH |
2228 | static int fib_triestat_seq_show(struct seq_file *seq, void *v) |
2229 | { | |
1c340b2f | 2230 | struct net *net = (struct net *)seq->private; |
3d3b2d25 | 2231 | unsigned int h; |
877a9bff | 2232 | |
d717a9a6 | 2233 | seq_printf(seq, |
a07f5f50 SH |
2234 | "Basic info: size of leaf:" |
2235 | " %Zd bytes, size of tnode: %Zd bytes.\n", | |
d717a9a6 SH |
2236 | sizeof(struct leaf), sizeof(struct tnode)); |
2237 | ||
3d3b2d25 SH |
2238 | for (h = 0; h < FIB_TABLE_HASHSZ; h++) { |
2239 | struct hlist_head *head = &net->ipv4.fib_table_hash[h]; | |
2240 | struct hlist_node *node; | |
2241 | struct fib_table *tb; | |
2242 | ||
2243 | hlist_for_each_entry_rcu(tb, node, head, tb_hlist) { | |
2244 | struct trie *t = (struct trie *) tb->tb_data; | |
2245 | struct trie_stat stat; | |
877a9bff | 2246 | |
3d3b2d25 SH |
2247 | if (!t) |
2248 | continue; | |
2249 | ||
2250 | fib_table_print(seq, tb); | |
2251 | ||
2252 | trie_collect_stats(t, &stat); | |
2253 | trie_show_stats(seq, &stat); | |
2254 | #ifdef CONFIG_IP_FIB_TRIE_STATS | |
2255 | trie_show_usage(seq, &t->stats); | |
2256 | #endif | |
2257 | } | |
2258 | } | |
19baf839 | 2259 | |
cb7b593c | 2260 | return 0; |
19baf839 RO |
2261 | } |
2262 | ||
cb7b593c | 2263 | static int fib_triestat_seq_open(struct inode *inode, struct file *file) |
19baf839 | 2264 | { |
de05c557 | 2265 | return single_open_net(inode, file, fib_triestat_seq_show); |
1c340b2f DL |
2266 | } |
2267 | ||
9a32144e | 2268 | static const struct file_operations fib_triestat_fops = { |
cb7b593c SH |
2269 | .owner = THIS_MODULE, |
2270 | .open = fib_triestat_seq_open, | |
2271 | .read = seq_read, | |
2272 | .llseek = seq_lseek, | |
b6fcbdb4 | 2273 | .release = single_release_net, |
cb7b593c SH |
2274 | }; |
2275 | ||
1218854a | 2276 | static struct node *fib_trie_get_idx(struct seq_file *seq, loff_t pos) |
19baf839 | 2277 | { |
1218854a YH |
2278 | struct fib_trie_iter *iter = seq->private; |
2279 | struct net *net = seq_file_net(seq); | |
cb7b593c | 2280 | loff_t idx = 0; |
3d3b2d25 | 2281 | unsigned int h; |
cb7b593c | 2282 | |
3d3b2d25 SH |
2283 | for (h = 0; h < FIB_TABLE_HASHSZ; h++) { |
2284 | struct hlist_head *head = &net->ipv4.fib_table_hash[h]; | |
2285 | struct hlist_node *node; | |
2286 | struct fib_table *tb; | |
cb7b593c | 2287 | |
3d3b2d25 SH |
2288 | hlist_for_each_entry_rcu(tb, node, head, tb_hlist) { |
2289 | struct node *n; | |
2290 | ||
2291 | for (n = fib_trie_get_first(iter, | |
2292 | (struct trie *) tb->tb_data); | |
2293 | n; n = fib_trie_get_next(iter)) | |
2294 | if (pos == idx++) { | |
2295 | iter->tb = tb; | |
2296 | return n; | |
2297 | } | |
2298 | } | |
cb7b593c | 2299 | } |
3d3b2d25 | 2300 | |
19baf839 RO |
2301 | return NULL; |
2302 | } | |
2303 | ||
cb7b593c | 2304 | static void *fib_trie_seq_start(struct seq_file *seq, loff_t *pos) |
c95aaf9a | 2305 | __acquires(RCU) |
19baf839 | 2306 | { |
cb7b593c | 2307 | rcu_read_lock(); |
1218854a | 2308 | return fib_trie_get_idx(seq, *pos); |
19baf839 RO |
2309 | } |
2310 | ||
cb7b593c | 2311 | static void *fib_trie_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
19baf839 | 2312 | { |
cb7b593c | 2313 | struct fib_trie_iter *iter = seq->private; |
1218854a | 2314 | struct net *net = seq_file_net(seq); |
3d3b2d25 SH |
2315 | struct fib_table *tb = iter->tb; |
2316 | struct hlist_node *tb_node; | |
2317 | unsigned int h; | |
2318 | struct node *n; | |
cb7b593c | 2319 | |
19baf839 | 2320 | ++*pos; |
3d3b2d25 SH |
2321 | /* next node in same table */ |
2322 | n = fib_trie_get_next(iter); | |
2323 | if (n) | |
2324 | return n; | |
19baf839 | 2325 | |
3d3b2d25 SH |
2326 | /* walk rest of this hash chain */ |
2327 | h = tb->tb_id & (FIB_TABLE_HASHSZ - 1); | |
2328 | while ( (tb_node = rcu_dereference(tb->tb_hlist.next)) ) { | |
2329 | tb = hlist_entry(tb_node, struct fib_table, tb_hlist); | |
2330 | n = fib_trie_get_first(iter, (struct trie *) tb->tb_data); | |
2331 | if (n) | |
2332 | goto found; | |
2333 | } | |
19baf839 | 2334 | |
3d3b2d25 SH |
2335 | /* new hash chain */ |
2336 | while (++h < FIB_TABLE_HASHSZ) { | |
2337 | struct hlist_head *head = &net->ipv4.fib_table_hash[h]; | |
2338 | hlist_for_each_entry_rcu(tb, tb_node, head, tb_hlist) { | |
2339 | n = fib_trie_get_first(iter, (struct trie *) tb->tb_data); | |
2340 | if (n) | |
2341 | goto found; | |
2342 | } | |
2343 | } | |
cb7b593c | 2344 | return NULL; |
3d3b2d25 SH |
2345 | |
2346 | found: | |
2347 | iter->tb = tb; | |
2348 | return n; | |
cb7b593c | 2349 | } |
19baf839 | 2350 | |
cb7b593c | 2351 | static void fib_trie_seq_stop(struct seq_file *seq, void *v) |
c95aaf9a | 2352 | __releases(RCU) |
19baf839 | 2353 | { |
cb7b593c SH |
2354 | rcu_read_unlock(); |
2355 | } | |
91b9a277 | 2356 | |
cb7b593c SH |
2357 | static void seq_indent(struct seq_file *seq, int n) |
2358 | { | |
2359 | while (n-- > 0) seq_puts(seq, " "); | |
2360 | } | |
19baf839 | 2361 | |
28d36e37 | 2362 | static inline const char *rtn_scope(char *buf, size_t len, enum rt_scope_t s) |
cb7b593c | 2363 | { |
132adf54 | 2364 | switch (s) { |
cb7b593c SH |
2365 | case RT_SCOPE_UNIVERSE: return "universe"; |
2366 | case RT_SCOPE_SITE: return "site"; | |
2367 | case RT_SCOPE_LINK: return "link"; | |
2368 | case RT_SCOPE_HOST: return "host"; | |
2369 | case RT_SCOPE_NOWHERE: return "nowhere"; | |
2370 | default: | |
28d36e37 | 2371 | snprintf(buf, len, "scope=%d", s); |
cb7b593c SH |
2372 | return buf; |
2373 | } | |
2374 | } | |
19baf839 | 2375 | |
36cbd3dc | 2376 | static const char *const rtn_type_names[__RTN_MAX] = { |
cb7b593c SH |
2377 | [RTN_UNSPEC] = "UNSPEC", |
2378 | [RTN_UNICAST] = "UNICAST", | |
2379 | [RTN_LOCAL] = "LOCAL", | |
2380 | [RTN_BROADCAST] = "BROADCAST", | |
2381 | [RTN_ANYCAST] = "ANYCAST", | |
2382 | [RTN_MULTICAST] = "MULTICAST", | |
2383 | [RTN_BLACKHOLE] = "BLACKHOLE", | |
2384 | [RTN_UNREACHABLE] = "UNREACHABLE", | |
2385 | [RTN_PROHIBIT] = "PROHIBIT", | |
2386 | [RTN_THROW] = "THROW", | |
2387 | [RTN_NAT] = "NAT", | |
2388 | [RTN_XRESOLVE] = "XRESOLVE", | |
2389 | }; | |
19baf839 | 2390 | |
28d36e37 | 2391 | static inline const char *rtn_type(char *buf, size_t len, unsigned t) |
cb7b593c | 2392 | { |
cb7b593c SH |
2393 | if (t < __RTN_MAX && rtn_type_names[t]) |
2394 | return rtn_type_names[t]; | |
28d36e37 | 2395 | snprintf(buf, len, "type %u", t); |
cb7b593c | 2396 | return buf; |
19baf839 RO |
2397 | } |
2398 | ||
cb7b593c SH |
2399 | /* Pretty print the trie */ |
2400 | static int fib_trie_seq_show(struct seq_file *seq, void *v) | |
19baf839 | 2401 | { |
cb7b593c SH |
2402 | const struct fib_trie_iter *iter = seq->private; |
2403 | struct node *n = v; | |
c877efb2 | 2404 | |
3d3b2d25 SH |
2405 | if (!node_parent_rcu(n)) |
2406 | fib_table_print(seq, iter->tb); | |
095b8501 | 2407 | |
cb7b593c SH |
2408 | if (IS_TNODE(n)) { |
2409 | struct tnode *tn = (struct tnode *) n; | |
ab66b4a7 | 2410 | __be32 prf = htonl(mask_pfx(tn->key, tn->pos)); |
91b9a277 | 2411 | |
1d25cd6c | 2412 | seq_indent(seq, iter->depth-1); |
673d57e7 HH |
2413 | seq_printf(seq, " +-- %pI4/%d %d %d %d\n", |
2414 | &prf, tn->pos, tn->bits, tn->full_children, | |
1d25cd6c | 2415 | tn->empty_children); |
e905a9ed | 2416 | |
cb7b593c SH |
2417 | } else { |
2418 | struct leaf *l = (struct leaf *) n; | |
1328042e SH |
2419 | struct leaf_info *li; |
2420 | struct hlist_node *node; | |
32ab5f80 | 2421 | __be32 val = htonl(l->key); |
cb7b593c SH |
2422 | |
2423 | seq_indent(seq, iter->depth); | |
673d57e7 | 2424 | seq_printf(seq, " |-- %pI4\n", &val); |
1328042e SH |
2425 | |
2426 | hlist_for_each_entry_rcu(li, node, &l->list, hlist) { | |
2427 | struct fib_alias *fa; | |
2428 | ||
2429 | list_for_each_entry_rcu(fa, &li->falh, fa_list) { | |
2430 | char buf1[32], buf2[32]; | |
2431 | ||
2432 | seq_indent(seq, iter->depth+1); | |
2433 | seq_printf(seq, " /%d %s %s", li->plen, | |
2434 | rtn_scope(buf1, sizeof(buf1), | |
2435 | fa->fa_scope), | |
2436 | rtn_type(buf2, sizeof(buf2), | |
2437 | fa->fa_type)); | |
2438 | if (fa->fa_tos) | |
b9c4d82a | 2439 | seq_printf(seq, " tos=%d", fa->fa_tos); |
1328042e | 2440 | seq_putc(seq, '\n'); |
cb7b593c SH |
2441 | } |
2442 | } | |
19baf839 | 2443 | } |
cb7b593c | 2444 | |
19baf839 RO |
2445 | return 0; |
2446 | } | |
2447 | ||
f690808e | 2448 | static const struct seq_operations fib_trie_seq_ops = { |
cb7b593c SH |
2449 | .start = fib_trie_seq_start, |
2450 | .next = fib_trie_seq_next, | |
2451 | .stop = fib_trie_seq_stop, | |
2452 | .show = fib_trie_seq_show, | |
19baf839 RO |
2453 | }; |
2454 | ||
cb7b593c | 2455 | static int fib_trie_seq_open(struct inode *inode, struct file *file) |
19baf839 | 2456 | { |
1c340b2f DL |
2457 | return seq_open_net(inode, file, &fib_trie_seq_ops, |
2458 | sizeof(struct fib_trie_iter)); | |
19baf839 RO |
2459 | } |
2460 | ||
9a32144e | 2461 | static const struct file_operations fib_trie_fops = { |
cb7b593c SH |
2462 | .owner = THIS_MODULE, |
2463 | .open = fib_trie_seq_open, | |
2464 | .read = seq_read, | |
2465 | .llseek = seq_lseek, | |
1c340b2f | 2466 | .release = seq_release_net, |
19baf839 RO |
2467 | }; |
2468 | ||
8315f5d8 SH |
2469 | struct fib_route_iter { |
2470 | struct seq_net_private p; | |
2471 | struct trie *main_trie; | |
2472 | loff_t pos; | |
2473 | t_key key; | |
2474 | }; | |
2475 | ||
2476 | static struct leaf *fib_route_get_idx(struct fib_route_iter *iter, loff_t pos) | |
2477 | { | |
2478 | struct leaf *l = NULL; | |
2479 | struct trie *t = iter->main_trie; | |
2480 | ||
2481 | /* use cache location of last found key */ | |
2482 | if (iter->pos > 0 && pos >= iter->pos && (l = fib_find_node(t, iter->key))) | |
2483 | pos -= iter->pos; | |
2484 | else { | |
2485 | iter->pos = 0; | |
2486 | l = trie_firstleaf(t); | |
2487 | } | |
2488 | ||
2489 | while (l && pos-- > 0) { | |
2490 | iter->pos++; | |
2491 | l = trie_nextleaf(l); | |
2492 | } | |
2493 | ||
2494 | if (l) | |
2495 | iter->key = pos; /* remember it */ | |
2496 | else | |
2497 | iter->pos = 0; /* forget it */ | |
2498 | ||
2499 | return l; | |
2500 | } | |
2501 | ||
2502 | static void *fib_route_seq_start(struct seq_file *seq, loff_t *pos) | |
2503 | __acquires(RCU) | |
2504 | { | |
2505 | struct fib_route_iter *iter = seq->private; | |
2506 | struct fib_table *tb; | |
2507 | ||
2508 | rcu_read_lock(); | |
1218854a | 2509 | tb = fib_get_table(seq_file_net(seq), RT_TABLE_MAIN); |
8315f5d8 SH |
2510 | if (!tb) |
2511 | return NULL; | |
2512 | ||
2513 | iter->main_trie = (struct trie *) tb->tb_data; | |
2514 | if (*pos == 0) | |
2515 | return SEQ_START_TOKEN; | |
2516 | else | |
2517 | return fib_route_get_idx(iter, *pos - 1); | |
2518 | } | |
2519 | ||
2520 | static void *fib_route_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2521 | { | |
2522 | struct fib_route_iter *iter = seq->private; | |
2523 | struct leaf *l = v; | |
2524 | ||
2525 | ++*pos; | |
2526 | if (v == SEQ_START_TOKEN) { | |
2527 | iter->pos = 0; | |
2528 | l = trie_firstleaf(iter->main_trie); | |
2529 | } else { | |
2530 | iter->pos++; | |
2531 | l = trie_nextleaf(l); | |
2532 | } | |
2533 | ||
2534 | if (l) | |
2535 | iter->key = l->key; | |
2536 | else | |
2537 | iter->pos = 0; | |
2538 | return l; | |
2539 | } | |
2540 | ||
2541 | static void fib_route_seq_stop(struct seq_file *seq, void *v) | |
2542 | __releases(RCU) | |
2543 | { | |
2544 | rcu_read_unlock(); | |
2545 | } | |
2546 | ||
32ab5f80 | 2547 | static unsigned fib_flag_trans(int type, __be32 mask, const struct fib_info *fi) |
19baf839 | 2548 | { |
cb7b593c SH |
2549 | static unsigned type2flags[RTN_MAX + 1] = { |
2550 | [7] = RTF_REJECT, [8] = RTF_REJECT, | |
2551 | }; | |
2552 | unsigned flags = type2flags[type]; | |
19baf839 | 2553 | |
cb7b593c SH |
2554 | if (fi && fi->fib_nh->nh_gw) |
2555 | flags |= RTF_GATEWAY; | |
32ab5f80 | 2556 | if (mask == htonl(0xFFFFFFFF)) |
cb7b593c SH |
2557 | flags |= RTF_HOST; |
2558 | flags |= RTF_UP; | |
2559 | return flags; | |
19baf839 RO |
2560 | } |
2561 | ||
cb7b593c SH |
2562 | /* |
2563 | * This outputs /proc/net/route. | |
2564 | * The format of the file is not supposed to be changed | |
2565 | * and needs to be same as fib_hash output to avoid breaking | |
2566 | * legacy utilities | |
2567 | */ | |
2568 | static int fib_route_seq_show(struct seq_file *seq, void *v) | |
19baf839 | 2569 | { |
cb7b593c | 2570 | struct leaf *l = v; |
1328042e SH |
2571 | struct leaf_info *li; |
2572 | struct hlist_node *node; | |
19baf839 | 2573 | |
cb7b593c SH |
2574 | if (v == SEQ_START_TOKEN) { |
2575 | seq_printf(seq, "%-127s\n", "Iface\tDestination\tGateway " | |
2576 | "\tFlags\tRefCnt\tUse\tMetric\tMask\t\tMTU" | |
2577 | "\tWindow\tIRTT"); | |
2578 | return 0; | |
2579 | } | |
19baf839 | 2580 | |
1328042e | 2581 | hlist_for_each_entry_rcu(li, node, &l->list, hlist) { |
cb7b593c | 2582 | struct fib_alias *fa; |
32ab5f80 | 2583 | __be32 mask, prefix; |
91b9a277 | 2584 | |
cb7b593c SH |
2585 | mask = inet_make_mask(li->plen); |
2586 | prefix = htonl(l->key); | |
19baf839 | 2587 | |
cb7b593c | 2588 | list_for_each_entry_rcu(fa, &li->falh, fa_list) { |
1371e37d | 2589 | const struct fib_info *fi = fa->fa_info; |
cb7b593c | 2590 | unsigned flags = fib_flag_trans(fa->fa_type, mask, fi); |
5e659e4c | 2591 | int len; |
19baf839 | 2592 | |
cb7b593c SH |
2593 | if (fa->fa_type == RTN_BROADCAST |
2594 | || fa->fa_type == RTN_MULTICAST) | |
2595 | continue; | |
19baf839 | 2596 | |
cb7b593c | 2597 | if (fi) |
5e659e4c PE |
2598 | seq_printf(seq, |
2599 | "%s\t%08X\t%08X\t%04X\t%d\t%u\t" | |
2600 | "%d\t%08X\t%d\t%u\t%u%n", | |
cb7b593c SH |
2601 | fi->fib_dev ? fi->fib_dev->name : "*", |
2602 | prefix, | |
2603 | fi->fib_nh->nh_gw, flags, 0, 0, | |
2604 | fi->fib_priority, | |
2605 | mask, | |
a07f5f50 SH |
2606 | (fi->fib_advmss ? |
2607 | fi->fib_advmss + 40 : 0), | |
cb7b593c | 2608 | fi->fib_window, |
5e659e4c | 2609 | fi->fib_rtt >> 3, &len); |
cb7b593c | 2610 | else |
5e659e4c PE |
2611 | seq_printf(seq, |
2612 | "*\t%08X\t%08X\t%04X\t%d\t%u\t" | |
2613 | "%d\t%08X\t%d\t%u\t%u%n", | |
cb7b593c | 2614 | prefix, 0, flags, 0, 0, 0, |
5e659e4c | 2615 | mask, 0, 0, 0, &len); |
19baf839 | 2616 | |
5e659e4c | 2617 | seq_printf(seq, "%*s\n", 127 - len, ""); |
cb7b593c | 2618 | } |
19baf839 RO |
2619 | } |
2620 | ||
2621 | return 0; | |
2622 | } | |
2623 | ||
f690808e | 2624 | static const struct seq_operations fib_route_seq_ops = { |
8315f5d8 SH |
2625 | .start = fib_route_seq_start, |
2626 | .next = fib_route_seq_next, | |
2627 | .stop = fib_route_seq_stop, | |
cb7b593c | 2628 | .show = fib_route_seq_show, |
19baf839 RO |
2629 | }; |
2630 | ||
cb7b593c | 2631 | static int fib_route_seq_open(struct inode *inode, struct file *file) |
19baf839 | 2632 | { |
1c340b2f | 2633 | return seq_open_net(inode, file, &fib_route_seq_ops, |
8315f5d8 | 2634 | sizeof(struct fib_route_iter)); |
19baf839 RO |
2635 | } |
2636 | ||
9a32144e | 2637 | static const struct file_operations fib_route_fops = { |
cb7b593c SH |
2638 | .owner = THIS_MODULE, |
2639 | .open = fib_route_seq_open, | |
2640 | .read = seq_read, | |
2641 | .llseek = seq_lseek, | |
1c340b2f | 2642 | .release = seq_release_net, |
19baf839 RO |
2643 | }; |
2644 | ||
61a02653 | 2645 | int __net_init fib_proc_init(struct net *net) |
19baf839 | 2646 | { |
61a02653 | 2647 | if (!proc_net_fops_create(net, "fib_trie", S_IRUGO, &fib_trie_fops)) |
cb7b593c SH |
2648 | goto out1; |
2649 | ||
61a02653 DL |
2650 | if (!proc_net_fops_create(net, "fib_triestat", S_IRUGO, |
2651 | &fib_triestat_fops)) | |
cb7b593c SH |
2652 | goto out2; |
2653 | ||
61a02653 | 2654 | if (!proc_net_fops_create(net, "route", S_IRUGO, &fib_route_fops)) |
cb7b593c SH |
2655 | goto out3; |
2656 | ||
19baf839 | 2657 | return 0; |
cb7b593c SH |
2658 | |
2659 | out3: | |
61a02653 | 2660 | proc_net_remove(net, "fib_triestat"); |
cb7b593c | 2661 | out2: |
61a02653 | 2662 | proc_net_remove(net, "fib_trie"); |
cb7b593c SH |
2663 | out1: |
2664 | return -ENOMEM; | |
19baf839 RO |
2665 | } |
2666 | ||
61a02653 | 2667 | void __net_exit fib_proc_exit(struct net *net) |
19baf839 | 2668 | { |
61a02653 DL |
2669 | proc_net_remove(net, "fib_trie"); |
2670 | proc_net_remove(net, "fib_triestat"); | |
2671 | proc_net_remove(net, "route"); | |
19baf839 RO |
2672 | } |
2673 | ||
2674 | #endif /* CONFIG_PROC_FS */ |