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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 | ||
05eee48c | 51 | #define VERSION "0.408" |
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> | |
457c4cbc | 74 | #include <net/net_namespace.h> |
19baf839 RO |
75 | #include <net/ip.h> |
76 | #include <net/protocol.h> | |
77 | #include <net/route.h> | |
78 | #include <net/tcp.h> | |
79 | #include <net/sock.h> | |
80 | #include <net/ip_fib.h> | |
81 | #include "fib_lookup.h" | |
82 | ||
06ef921d | 83 | #define MAX_STAT_DEPTH 32 |
19baf839 | 84 | |
19baf839 | 85 | #define KEYLENGTH (8*sizeof(t_key)) |
19baf839 | 86 | |
19baf839 RO |
87 | typedef unsigned int t_key; |
88 | ||
89 | #define T_TNODE 0 | |
90 | #define T_LEAF 1 | |
91 | #define NODE_TYPE_MASK 0x1UL | |
2373ce1c RO |
92 | #define NODE_TYPE(node) ((node)->parent & NODE_TYPE_MASK) |
93 | ||
91b9a277 OJ |
94 | #define IS_TNODE(n) (!(n->parent & T_LEAF)) |
95 | #define IS_LEAF(n) (n->parent & T_LEAF) | |
19baf839 RO |
96 | |
97 | struct node { | |
91b9a277 | 98 | unsigned long parent; |
8d965444 | 99 | t_key key; |
19baf839 RO |
100 | }; |
101 | ||
102 | struct leaf { | |
91b9a277 | 103 | unsigned long parent; |
8d965444 | 104 | t_key key; |
19baf839 | 105 | struct hlist_head list; |
2373ce1c | 106 | struct rcu_head rcu; |
19baf839 RO |
107 | }; |
108 | ||
109 | struct leaf_info { | |
110 | struct hlist_node hlist; | |
2373ce1c | 111 | struct rcu_head rcu; |
19baf839 RO |
112 | int plen; |
113 | struct list_head falh; | |
114 | }; | |
115 | ||
116 | struct tnode { | |
91b9a277 | 117 | unsigned long parent; |
8d965444 | 118 | t_key key; |
112d8cfc ED |
119 | unsigned char pos; /* 2log(KEYLENGTH) bits needed */ |
120 | unsigned char bits; /* 2log(KEYLENGTH) bits needed */ | |
8d965444 ED |
121 | unsigned int full_children; /* KEYLENGTH bits needed */ |
122 | unsigned int empty_children; /* KEYLENGTH bits needed */ | |
15be75cd SH |
123 | union { |
124 | struct rcu_head rcu; | |
125 | struct work_struct work; | |
126 | }; | |
91b9a277 | 127 | struct node *child[0]; |
19baf839 RO |
128 | }; |
129 | ||
130 | #ifdef CONFIG_IP_FIB_TRIE_STATS | |
131 | struct trie_use_stats { | |
132 | unsigned int gets; | |
133 | unsigned int backtrack; | |
134 | unsigned int semantic_match_passed; | |
135 | unsigned int semantic_match_miss; | |
136 | unsigned int null_node_hit; | |
2f36895a | 137 | unsigned int resize_node_skipped; |
19baf839 RO |
138 | }; |
139 | #endif | |
140 | ||
141 | struct trie_stat { | |
142 | unsigned int totdepth; | |
143 | unsigned int maxdepth; | |
144 | unsigned int tnodes; | |
145 | unsigned int leaves; | |
146 | unsigned int nullpointers; | |
93672292 | 147 | unsigned int prefixes; |
06ef921d | 148 | unsigned int nodesizes[MAX_STAT_DEPTH]; |
c877efb2 | 149 | }; |
19baf839 RO |
150 | |
151 | struct trie { | |
91b9a277 | 152 | struct node *trie; |
19baf839 RO |
153 | #ifdef CONFIG_IP_FIB_TRIE_STATS |
154 | struct trie_use_stats stats; | |
155 | #endif | |
19baf839 RO |
156 | }; |
157 | ||
19baf839 | 158 | static void put_child(struct trie *t, struct tnode *tn, int i, struct node *n); |
a07f5f50 SH |
159 | static void tnode_put_child_reorg(struct tnode *tn, int i, struct node *n, |
160 | int wasfull); | |
19baf839 | 161 | static struct node *resize(struct trie *t, struct tnode *tn); |
2f80b3c8 RO |
162 | static struct tnode *inflate(struct trie *t, struct tnode *tn); |
163 | static struct tnode *halve(struct trie *t, struct tnode *tn); | |
19baf839 | 164 | |
e18b890b | 165 | static struct kmem_cache *fn_alias_kmem __read_mostly; |
bc3c8c1e | 166 | static struct kmem_cache *trie_leaf_kmem __read_mostly; |
19baf839 | 167 | |
06801916 SH |
168 | static inline struct tnode *node_parent(struct node *node) |
169 | { | |
b59cfbf7 ED |
170 | return (struct tnode *)(node->parent & ~NODE_TYPE_MASK); |
171 | } | |
172 | ||
173 | static inline struct tnode *node_parent_rcu(struct node *node) | |
174 | { | |
175 | struct tnode *ret = node_parent(node); | |
06801916 | 176 | |
06801916 SH |
177 | return rcu_dereference(ret); |
178 | } | |
179 | ||
6440cc9e SH |
180 | /* Same as rcu_assign_pointer |
181 | * but that macro() assumes that value is a pointer. | |
182 | */ | |
06801916 SH |
183 | static inline void node_set_parent(struct node *node, struct tnode *ptr) |
184 | { | |
6440cc9e SH |
185 | smp_wmb(); |
186 | node->parent = (unsigned long)ptr | NODE_TYPE(node); | |
06801916 | 187 | } |
2373ce1c | 188 | |
b59cfbf7 ED |
189 | static inline struct node *tnode_get_child(struct tnode *tn, unsigned int i) |
190 | { | |
191 | BUG_ON(i >= 1U << tn->bits); | |
2373ce1c | 192 | |
b59cfbf7 ED |
193 | return tn->child[i]; |
194 | } | |
195 | ||
196 | static inline struct node *tnode_get_child_rcu(struct tnode *tn, unsigned int i) | |
19baf839 | 197 | { |
b59cfbf7 | 198 | struct node *ret = tnode_get_child(tn, i); |
19baf839 | 199 | |
b59cfbf7 | 200 | return rcu_dereference(ret); |
19baf839 RO |
201 | } |
202 | ||
bb435b8d | 203 | static inline int tnode_child_length(const struct tnode *tn) |
19baf839 | 204 | { |
91b9a277 | 205 | return 1 << tn->bits; |
19baf839 RO |
206 | } |
207 | ||
ab66b4a7 SH |
208 | static inline t_key mask_pfx(t_key k, unsigned short l) |
209 | { | |
210 | return (l == 0) ? 0 : k >> (KEYLENGTH-l) << (KEYLENGTH-l); | |
211 | } | |
212 | ||
19baf839 RO |
213 | static inline t_key tkey_extract_bits(t_key a, int offset, int bits) |
214 | { | |
91b9a277 | 215 | if (offset < KEYLENGTH) |
19baf839 | 216 | return ((t_key)(a << offset)) >> (KEYLENGTH - bits); |
91b9a277 | 217 | else |
19baf839 RO |
218 | return 0; |
219 | } | |
220 | ||
221 | static inline int tkey_equals(t_key a, t_key b) | |
222 | { | |
c877efb2 | 223 | return a == b; |
19baf839 RO |
224 | } |
225 | ||
226 | static inline int tkey_sub_equals(t_key a, int offset, int bits, t_key b) | |
227 | { | |
c877efb2 SH |
228 | if (bits == 0 || offset >= KEYLENGTH) |
229 | return 1; | |
91b9a277 OJ |
230 | bits = bits > KEYLENGTH ? KEYLENGTH : bits; |
231 | return ((a ^ b) << offset) >> (KEYLENGTH - bits) == 0; | |
c877efb2 | 232 | } |
19baf839 RO |
233 | |
234 | static inline int tkey_mismatch(t_key a, int offset, t_key b) | |
235 | { | |
236 | t_key diff = a ^ b; | |
237 | int i = offset; | |
238 | ||
c877efb2 SH |
239 | if (!diff) |
240 | return 0; | |
241 | while ((diff << i) >> (KEYLENGTH-1) == 0) | |
19baf839 RO |
242 | i++; |
243 | return i; | |
244 | } | |
245 | ||
19baf839 | 246 | /* |
e905a9ed YH |
247 | To understand this stuff, an understanding of keys and all their bits is |
248 | necessary. Every node in the trie has a key associated with it, but not | |
19baf839 RO |
249 | all of the bits in that key are significant. |
250 | ||
251 | Consider a node 'n' and its parent 'tp'. | |
252 | ||
e905a9ed YH |
253 | If n is a leaf, every bit in its key is significant. Its presence is |
254 | necessitated by path compression, since during a tree traversal (when | |
255 | searching for a leaf - unless we are doing an insertion) we will completely | |
256 | ignore all skipped bits we encounter. Thus we need to verify, at the end of | |
257 | a potentially successful search, that we have indeed been walking the | |
19baf839 RO |
258 | correct key path. |
259 | ||
e905a9ed YH |
260 | Note that we can never "miss" the correct key in the tree if present by |
261 | following the wrong path. Path compression ensures that segments of the key | |
262 | that are the same for all keys with a given prefix are skipped, but the | |
263 | skipped part *is* identical for each node in the subtrie below the skipped | |
264 | bit! trie_insert() in this implementation takes care of that - note the | |
19baf839 RO |
265 | call to tkey_sub_equals() in trie_insert(). |
266 | ||
e905a9ed | 267 | if n is an internal node - a 'tnode' here, the various parts of its key |
19baf839 RO |
268 | have many different meanings. |
269 | ||
e905a9ed | 270 | Example: |
19baf839 RO |
271 | _________________________________________________________________ |
272 | | i | i | i | i | i | i | i | N | N | N | S | S | S | S | S | C | | |
273 | ----------------------------------------------------------------- | |
e905a9ed | 274 | 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 |
19baf839 RO |
275 | |
276 | _________________________________________________________________ | |
277 | | C | C | C | u | u | u | u | u | u | u | u | u | u | u | u | u | | |
278 | ----------------------------------------------------------------- | |
279 | 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 | |
280 | ||
281 | tp->pos = 7 | |
282 | tp->bits = 3 | |
283 | n->pos = 15 | |
91b9a277 | 284 | n->bits = 4 |
19baf839 | 285 | |
e905a9ed YH |
286 | First, let's just ignore the bits that come before the parent tp, that is |
287 | the bits from 0 to (tp->pos-1). They are *known* but at this point we do | |
19baf839 RO |
288 | not use them for anything. |
289 | ||
290 | The bits from (tp->pos) to (tp->pos + tp->bits - 1) - "N", above - are the | |
e905a9ed | 291 | index into the parent's child array. That is, they will be used to find |
19baf839 RO |
292 | 'n' among tp's children. |
293 | ||
294 | The bits from (tp->pos + tp->bits) to (n->pos - 1) - "S" - are skipped bits | |
295 | for the node n. | |
296 | ||
e905a9ed | 297 | All the bits we have seen so far are significant to the node n. The rest |
19baf839 RO |
298 | of the bits are really not needed or indeed known in n->key. |
299 | ||
e905a9ed | 300 | The bits from (n->pos) to (n->pos + n->bits - 1) - "C" - are the index into |
19baf839 | 301 | n's child array, and will of course be different for each child. |
e905a9ed | 302 | |
c877efb2 | 303 | |
19baf839 RO |
304 | The rest of the bits, from (n->pos + n->bits) onward, are completely unknown |
305 | at this point. | |
306 | ||
307 | */ | |
308 | ||
0c7770c7 | 309 | static inline void check_tnode(const struct tnode *tn) |
19baf839 | 310 | { |
0c7770c7 | 311 | WARN_ON(tn && tn->pos+tn->bits > 32); |
19baf839 RO |
312 | } |
313 | ||
f5026fab DL |
314 | static const int halve_threshold = 25; |
315 | static const int inflate_threshold = 50; | |
316 | static const int halve_threshold_root = 8; | |
317 | static const int inflate_threshold_root = 15; | |
19baf839 | 318 | |
2373ce1c RO |
319 | |
320 | static void __alias_free_mem(struct rcu_head *head) | |
19baf839 | 321 | { |
2373ce1c RO |
322 | struct fib_alias *fa = container_of(head, struct fib_alias, rcu); |
323 | kmem_cache_free(fn_alias_kmem, fa); | |
19baf839 RO |
324 | } |
325 | ||
2373ce1c | 326 | static inline void alias_free_mem_rcu(struct fib_alias *fa) |
19baf839 | 327 | { |
2373ce1c RO |
328 | call_rcu(&fa->rcu, __alias_free_mem); |
329 | } | |
91b9a277 | 330 | |
2373ce1c RO |
331 | static void __leaf_free_rcu(struct rcu_head *head) |
332 | { | |
bc3c8c1e SH |
333 | struct leaf *l = container_of(head, struct leaf, rcu); |
334 | kmem_cache_free(trie_leaf_kmem, l); | |
2373ce1c | 335 | } |
91b9a277 | 336 | |
387a5487 SH |
337 | static inline void free_leaf(struct leaf *l) |
338 | { | |
339 | call_rcu_bh(&l->rcu, __leaf_free_rcu); | |
340 | } | |
341 | ||
2373ce1c | 342 | static void __leaf_info_free_rcu(struct rcu_head *head) |
19baf839 | 343 | { |
2373ce1c | 344 | kfree(container_of(head, struct leaf_info, rcu)); |
19baf839 RO |
345 | } |
346 | ||
2373ce1c | 347 | static inline void free_leaf_info(struct leaf_info *leaf) |
19baf839 | 348 | { |
2373ce1c | 349 | call_rcu(&leaf->rcu, __leaf_info_free_rcu); |
19baf839 RO |
350 | } |
351 | ||
8d965444 | 352 | static struct tnode *tnode_alloc(size_t size) |
f0e36f8c | 353 | { |
2373ce1c | 354 | if (size <= PAGE_SIZE) |
8d965444 | 355 | return kzalloc(size, GFP_KERNEL); |
15be75cd SH |
356 | else |
357 | return __vmalloc(size, GFP_KERNEL | __GFP_ZERO, PAGE_KERNEL); | |
358 | } | |
2373ce1c | 359 | |
15be75cd SH |
360 | static void __tnode_vfree(struct work_struct *arg) |
361 | { | |
362 | struct tnode *tn = container_of(arg, struct tnode, work); | |
363 | vfree(tn); | |
f0e36f8c PM |
364 | } |
365 | ||
2373ce1c | 366 | static void __tnode_free_rcu(struct rcu_head *head) |
f0e36f8c | 367 | { |
2373ce1c | 368 | struct tnode *tn = container_of(head, struct tnode, rcu); |
8d965444 ED |
369 | size_t size = sizeof(struct tnode) + |
370 | (sizeof(struct node *) << tn->bits); | |
f0e36f8c PM |
371 | |
372 | if (size <= PAGE_SIZE) | |
373 | kfree(tn); | |
15be75cd SH |
374 | else { |
375 | INIT_WORK(&tn->work, __tnode_vfree); | |
376 | schedule_work(&tn->work); | |
377 | } | |
f0e36f8c PM |
378 | } |
379 | ||
2373ce1c RO |
380 | static inline void tnode_free(struct tnode *tn) |
381 | { | |
387a5487 SH |
382 | if (IS_LEAF(tn)) |
383 | free_leaf((struct leaf *) tn); | |
384 | else | |
550e29bc | 385 | call_rcu(&tn->rcu, __tnode_free_rcu); |
2373ce1c RO |
386 | } |
387 | ||
388 | static struct leaf *leaf_new(void) | |
389 | { | |
bc3c8c1e | 390 | struct leaf *l = kmem_cache_alloc(trie_leaf_kmem, GFP_KERNEL); |
2373ce1c RO |
391 | if (l) { |
392 | l->parent = T_LEAF; | |
393 | INIT_HLIST_HEAD(&l->list); | |
394 | } | |
395 | return l; | |
396 | } | |
397 | ||
398 | static struct leaf_info *leaf_info_new(int plen) | |
399 | { | |
400 | struct leaf_info *li = kmalloc(sizeof(struct leaf_info), GFP_KERNEL); | |
401 | if (li) { | |
402 | li->plen = plen; | |
403 | INIT_LIST_HEAD(&li->falh); | |
404 | } | |
405 | return li; | |
406 | } | |
407 | ||
a07f5f50 | 408 | static struct tnode *tnode_new(t_key key, int pos, int bits) |
19baf839 | 409 | { |
8d965444 | 410 | size_t sz = sizeof(struct tnode) + (sizeof(struct node *) << bits); |
f0e36f8c | 411 | struct tnode *tn = tnode_alloc(sz); |
19baf839 | 412 | |
91b9a277 | 413 | if (tn) { |
2373ce1c | 414 | tn->parent = T_TNODE; |
19baf839 RO |
415 | tn->pos = pos; |
416 | tn->bits = bits; | |
417 | tn->key = key; | |
418 | tn->full_children = 0; | |
419 | tn->empty_children = 1<<bits; | |
420 | } | |
c877efb2 | 421 | |
8d965444 ED |
422 | pr_debug("AT %p s=%u %lu\n", tn, (unsigned int) sizeof(struct tnode), |
423 | (unsigned long) (sizeof(struct node) << bits)); | |
19baf839 RO |
424 | return tn; |
425 | } | |
426 | ||
19baf839 RO |
427 | /* |
428 | * Check whether a tnode 'n' is "full", i.e. it is an internal node | |
429 | * and no bits are skipped. See discussion in dyntree paper p. 6 | |
430 | */ | |
431 | ||
bb435b8d | 432 | static inline int tnode_full(const struct tnode *tn, const struct node *n) |
19baf839 | 433 | { |
c877efb2 | 434 | if (n == NULL || IS_LEAF(n)) |
19baf839 RO |
435 | return 0; |
436 | ||
437 | return ((struct tnode *) n)->pos == tn->pos + tn->bits; | |
438 | } | |
439 | ||
a07f5f50 SH |
440 | static inline void put_child(struct trie *t, struct tnode *tn, int i, |
441 | struct node *n) | |
19baf839 RO |
442 | { |
443 | tnode_put_child_reorg(tn, i, n, -1); | |
444 | } | |
445 | ||
c877efb2 | 446 | /* |
19baf839 RO |
447 | * Add a child at position i overwriting the old value. |
448 | * Update the value of full_children and empty_children. | |
449 | */ | |
450 | ||
a07f5f50 SH |
451 | static void tnode_put_child_reorg(struct tnode *tn, int i, struct node *n, |
452 | int wasfull) | |
19baf839 | 453 | { |
2373ce1c | 454 | struct node *chi = tn->child[i]; |
19baf839 RO |
455 | int isfull; |
456 | ||
0c7770c7 SH |
457 | BUG_ON(i >= 1<<tn->bits); |
458 | ||
19baf839 RO |
459 | /* update emptyChildren */ |
460 | if (n == NULL && chi != NULL) | |
461 | tn->empty_children++; | |
462 | else if (n != NULL && chi == NULL) | |
463 | tn->empty_children--; | |
c877efb2 | 464 | |
19baf839 | 465 | /* update fullChildren */ |
91b9a277 | 466 | if (wasfull == -1) |
19baf839 RO |
467 | wasfull = tnode_full(tn, chi); |
468 | ||
469 | isfull = tnode_full(tn, n); | |
c877efb2 | 470 | if (wasfull && !isfull) |
19baf839 | 471 | tn->full_children--; |
c877efb2 | 472 | else if (!wasfull && isfull) |
19baf839 | 473 | tn->full_children++; |
91b9a277 | 474 | |
c877efb2 | 475 | if (n) |
06801916 | 476 | node_set_parent(n, tn); |
19baf839 | 477 | |
2373ce1c | 478 | rcu_assign_pointer(tn->child[i], n); |
19baf839 RO |
479 | } |
480 | ||
c877efb2 | 481 | static struct node *resize(struct trie *t, struct tnode *tn) |
19baf839 RO |
482 | { |
483 | int i; | |
2f36895a | 484 | int err = 0; |
2f80b3c8 | 485 | struct tnode *old_tn; |
e6308be8 RO |
486 | int inflate_threshold_use; |
487 | int halve_threshold_use; | |
05eee48c | 488 | int max_resize; |
19baf839 | 489 | |
e905a9ed | 490 | if (!tn) |
19baf839 RO |
491 | return NULL; |
492 | ||
0c7770c7 SH |
493 | pr_debug("In tnode_resize %p inflate_threshold=%d threshold=%d\n", |
494 | tn, inflate_threshold, halve_threshold); | |
19baf839 RO |
495 | |
496 | /* No children */ | |
497 | if (tn->empty_children == tnode_child_length(tn)) { | |
498 | tnode_free(tn); | |
499 | return NULL; | |
500 | } | |
501 | /* One child */ | |
502 | if (tn->empty_children == tnode_child_length(tn) - 1) | |
503 | for (i = 0; i < tnode_child_length(tn); i++) { | |
91b9a277 | 504 | struct node *n; |
19baf839 | 505 | |
91b9a277 | 506 | n = tn->child[i]; |
2373ce1c | 507 | if (!n) |
91b9a277 | 508 | continue; |
91b9a277 OJ |
509 | |
510 | /* compress one level */ | |
06801916 | 511 | node_set_parent(n, NULL); |
91b9a277 OJ |
512 | tnode_free(tn); |
513 | return n; | |
19baf839 | 514 | } |
c877efb2 | 515 | /* |
19baf839 RO |
516 | * Double as long as the resulting node has a number of |
517 | * nonempty nodes that are above the threshold. | |
518 | */ | |
519 | ||
520 | /* | |
c877efb2 SH |
521 | * From "Implementing a dynamic compressed trie" by Stefan Nilsson of |
522 | * the Helsinki University of Technology and Matti Tikkanen of Nokia | |
19baf839 | 523 | * Telecommunications, page 6: |
c877efb2 | 524 | * "A node is doubled if the ratio of non-empty children to all |
19baf839 RO |
525 | * children in the *doubled* node is at least 'high'." |
526 | * | |
c877efb2 SH |
527 | * 'high' in this instance is the variable 'inflate_threshold'. It |
528 | * is expressed as a percentage, so we multiply it with | |
529 | * tnode_child_length() and instead of multiplying by 2 (since the | |
530 | * child array will be doubled by inflate()) and multiplying | |
531 | * the left-hand side by 100 (to handle the percentage thing) we | |
19baf839 | 532 | * multiply the left-hand side by 50. |
c877efb2 SH |
533 | * |
534 | * The left-hand side may look a bit weird: tnode_child_length(tn) | |
535 | * - tn->empty_children is of course the number of non-null children | |
536 | * in the current node. tn->full_children is the number of "full" | |
19baf839 | 537 | * children, that is non-null tnodes with a skip value of 0. |
c877efb2 | 538 | * All of those will be doubled in the resulting inflated tnode, so |
19baf839 | 539 | * we just count them one extra time here. |
c877efb2 | 540 | * |
19baf839 | 541 | * A clearer way to write this would be: |
c877efb2 | 542 | * |
19baf839 | 543 | * to_be_doubled = tn->full_children; |
c877efb2 | 544 | * not_to_be_doubled = tnode_child_length(tn) - tn->empty_children - |
19baf839 RO |
545 | * tn->full_children; |
546 | * | |
547 | * new_child_length = tnode_child_length(tn) * 2; | |
548 | * | |
c877efb2 | 549 | * new_fill_factor = 100 * (not_to_be_doubled + 2*to_be_doubled) / |
19baf839 RO |
550 | * new_child_length; |
551 | * if (new_fill_factor >= inflate_threshold) | |
c877efb2 SH |
552 | * |
553 | * ...and so on, tho it would mess up the while () loop. | |
554 | * | |
19baf839 RO |
555 | * anyway, |
556 | * 100 * (not_to_be_doubled + 2*to_be_doubled) / new_child_length >= | |
557 | * inflate_threshold | |
c877efb2 | 558 | * |
19baf839 RO |
559 | * avoid a division: |
560 | * 100 * (not_to_be_doubled + 2*to_be_doubled) >= | |
561 | * inflate_threshold * new_child_length | |
c877efb2 | 562 | * |
19baf839 | 563 | * expand not_to_be_doubled and to_be_doubled, and shorten: |
c877efb2 | 564 | * 100 * (tnode_child_length(tn) - tn->empty_children + |
91b9a277 | 565 | * tn->full_children) >= inflate_threshold * new_child_length |
c877efb2 | 566 | * |
19baf839 | 567 | * expand new_child_length: |
c877efb2 | 568 | * 100 * (tnode_child_length(tn) - tn->empty_children + |
91b9a277 | 569 | * tn->full_children) >= |
19baf839 | 570 | * inflate_threshold * tnode_child_length(tn) * 2 |
c877efb2 | 571 | * |
19baf839 | 572 | * shorten again: |
c877efb2 | 573 | * 50 * (tn->full_children + tnode_child_length(tn) - |
91b9a277 | 574 | * tn->empty_children) >= inflate_threshold * |
19baf839 | 575 | * tnode_child_length(tn) |
c877efb2 | 576 | * |
19baf839 RO |
577 | */ |
578 | ||
579 | check_tnode(tn); | |
c877efb2 | 580 | |
e6308be8 RO |
581 | /* Keep root node larger */ |
582 | ||
132adf54 | 583 | if (!tn->parent) |
e6308be8 | 584 | inflate_threshold_use = inflate_threshold_root; |
e905a9ed | 585 | else |
e6308be8 RO |
586 | inflate_threshold_use = inflate_threshold; |
587 | ||
2f36895a | 588 | err = 0; |
05eee48c RO |
589 | max_resize = 10; |
590 | while ((tn->full_children > 0 && max_resize-- && | |
a07f5f50 SH |
591 | 50 * (tn->full_children + tnode_child_length(tn) |
592 | - tn->empty_children) | |
593 | >= inflate_threshold_use * tnode_child_length(tn))) { | |
19baf839 | 594 | |
2f80b3c8 RO |
595 | old_tn = tn; |
596 | tn = inflate(t, tn); | |
a07f5f50 | 597 | |
2f80b3c8 RO |
598 | if (IS_ERR(tn)) { |
599 | tn = old_tn; | |
2f36895a RO |
600 | #ifdef CONFIG_IP_FIB_TRIE_STATS |
601 | t->stats.resize_node_skipped++; | |
602 | #endif | |
603 | break; | |
604 | } | |
19baf839 RO |
605 | } |
606 | ||
05eee48c RO |
607 | if (max_resize < 0) { |
608 | if (!tn->parent) | |
a07f5f50 SH |
609 | pr_warning("Fix inflate_threshold_root." |
610 | " Now=%d size=%d bits\n", | |
611 | inflate_threshold_root, tn->bits); | |
05eee48c | 612 | else |
a07f5f50 SH |
613 | pr_warning("Fix inflate_threshold." |
614 | " Now=%d size=%d bits\n", | |
615 | inflate_threshold, tn->bits); | |
05eee48c RO |
616 | } |
617 | ||
19baf839 RO |
618 | check_tnode(tn); |
619 | ||
620 | /* | |
621 | * Halve as long as the number of empty children in this | |
622 | * node is above threshold. | |
623 | */ | |
2f36895a | 624 | |
e6308be8 RO |
625 | |
626 | /* Keep root node larger */ | |
627 | ||
132adf54 | 628 | if (!tn->parent) |
e6308be8 | 629 | halve_threshold_use = halve_threshold_root; |
e905a9ed | 630 | else |
e6308be8 RO |
631 | halve_threshold_use = halve_threshold; |
632 | ||
2f36895a | 633 | err = 0; |
05eee48c RO |
634 | max_resize = 10; |
635 | while (tn->bits > 1 && max_resize-- && | |
19baf839 | 636 | 100 * (tnode_child_length(tn) - tn->empty_children) < |
e6308be8 | 637 | halve_threshold_use * tnode_child_length(tn)) { |
2f36895a | 638 | |
2f80b3c8 RO |
639 | old_tn = tn; |
640 | tn = halve(t, tn); | |
641 | if (IS_ERR(tn)) { | |
642 | tn = old_tn; | |
2f36895a RO |
643 | #ifdef CONFIG_IP_FIB_TRIE_STATS |
644 | t->stats.resize_node_skipped++; | |
645 | #endif | |
646 | break; | |
647 | } | |
648 | } | |
19baf839 | 649 | |
05eee48c RO |
650 | if (max_resize < 0) { |
651 | if (!tn->parent) | |
a07f5f50 SH |
652 | pr_warning("Fix halve_threshold_root." |
653 | " Now=%d size=%d bits\n", | |
654 | halve_threshold_root, tn->bits); | |
05eee48c | 655 | else |
a07f5f50 SH |
656 | pr_warning("Fix halve_threshold." |
657 | " Now=%d size=%d bits\n", | |
658 | halve_threshold, tn->bits); | |
05eee48c | 659 | } |
c877efb2 | 660 | |
19baf839 | 661 | /* Only one child remains */ |
19baf839 RO |
662 | if (tn->empty_children == tnode_child_length(tn) - 1) |
663 | for (i = 0; i < tnode_child_length(tn); i++) { | |
91b9a277 | 664 | struct node *n; |
19baf839 | 665 | |
91b9a277 | 666 | n = tn->child[i]; |
2373ce1c | 667 | if (!n) |
91b9a277 | 668 | continue; |
91b9a277 OJ |
669 | |
670 | /* compress one level */ | |
671 | ||
06801916 | 672 | node_set_parent(n, NULL); |
91b9a277 OJ |
673 | tnode_free(tn); |
674 | return n; | |
19baf839 RO |
675 | } |
676 | ||
677 | return (struct node *) tn; | |
678 | } | |
679 | ||
2f80b3c8 | 680 | static struct tnode *inflate(struct trie *t, struct tnode *tn) |
19baf839 | 681 | { |
19baf839 RO |
682 | struct tnode *oldtnode = tn; |
683 | int olen = tnode_child_length(tn); | |
684 | int i; | |
685 | ||
0c7770c7 | 686 | pr_debug("In inflate\n"); |
19baf839 RO |
687 | |
688 | tn = tnode_new(oldtnode->key, oldtnode->pos, oldtnode->bits + 1); | |
689 | ||
0c7770c7 | 690 | if (!tn) |
2f80b3c8 | 691 | return ERR_PTR(-ENOMEM); |
2f36895a RO |
692 | |
693 | /* | |
c877efb2 SH |
694 | * Preallocate and store tnodes before the actual work so we |
695 | * don't get into an inconsistent state if memory allocation | |
696 | * fails. In case of failure we return the oldnode and inflate | |
2f36895a RO |
697 | * of tnode is ignored. |
698 | */ | |
91b9a277 OJ |
699 | |
700 | for (i = 0; i < olen; i++) { | |
a07f5f50 | 701 | struct tnode *inode; |
2f36895a | 702 | |
a07f5f50 | 703 | inode = (struct tnode *) tnode_get_child(oldtnode, i); |
2f36895a RO |
704 | if (inode && |
705 | IS_TNODE(inode) && | |
706 | inode->pos == oldtnode->pos + oldtnode->bits && | |
707 | inode->bits > 1) { | |
708 | struct tnode *left, *right; | |
ab66b4a7 | 709 | t_key m = ~0U << (KEYLENGTH - 1) >> inode->pos; |
c877efb2 | 710 | |
2f36895a RO |
711 | left = tnode_new(inode->key&(~m), inode->pos + 1, |
712 | inode->bits - 1); | |
2f80b3c8 RO |
713 | if (!left) |
714 | goto nomem; | |
91b9a277 | 715 | |
2f36895a RO |
716 | right = tnode_new(inode->key|m, inode->pos + 1, |
717 | inode->bits - 1); | |
718 | ||
e905a9ed | 719 | if (!right) { |
2f80b3c8 RO |
720 | tnode_free(left); |
721 | goto nomem; | |
e905a9ed | 722 | } |
2f36895a RO |
723 | |
724 | put_child(t, tn, 2*i, (struct node *) left); | |
725 | put_child(t, tn, 2*i+1, (struct node *) right); | |
726 | } | |
727 | } | |
728 | ||
91b9a277 | 729 | for (i = 0; i < olen; i++) { |
c95aaf9a | 730 | struct tnode *inode; |
19baf839 | 731 | struct node *node = tnode_get_child(oldtnode, i); |
91b9a277 OJ |
732 | struct tnode *left, *right; |
733 | int size, j; | |
c877efb2 | 734 | |
19baf839 RO |
735 | /* An empty child */ |
736 | if (node == NULL) | |
737 | continue; | |
738 | ||
739 | /* A leaf or an internal node with skipped bits */ | |
740 | ||
c877efb2 | 741 | if (IS_LEAF(node) || ((struct tnode *) node)->pos > |
19baf839 | 742 | tn->pos + tn->bits - 1) { |
a07f5f50 SH |
743 | if (tkey_extract_bits(node->key, |
744 | oldtnode->pos + oldtnode->bits, | |
745 | 1) == 0) | |
19baf839 RO |
746 | put_child(t, tn, 2*i, node); |
747 | else | |
748 | put_child(t, tn, 2*i+1, node); | |
749 | continue; | |
750 | } | |
751 | ||
752 | /* An internal node with two children */ | |
753 | inode = (struct tnode *) node; | |
754 | ||
755 | if (inode->bits == 1) { | |
756 | put_child(t, tn, 2*i, inode->child[0]); | |
757 | put_child(t, tn, 2*i+1, inode->child[1]); | |
758 | ||
759 | tnode_free(inode); | |
91b9a277 | 760 | continue; |
19baf839 RO |
761 | } |
762 | ||
91b9a277 OJ |
763 | /* An internal node with more than two children */ |
764 | ||
765 | /* We will replace this node 'inode' with two new | |
766 | * ones, 'left' and 'right', each with half of the | |
767 | * original children. The two new nodes will have | |
768 | * a position one bit further down the key and this | |
769 | * means that the "significant" part of their keys | |
770 | * (see the discussion near the top of this file) | |
771 | * will differ by one bit, which will be "0" in | |
772 | * left's key and "1" in right's key. Since we are | |
773 | * moving the key position by one step, the bit that | |
774 | * we are moving away from - the bit at position | |
775 | * (inode->pos) - is the one that will differ between | |
776 | * left and right. So... we synthesize that bit in the | |
777 | * two new keys. | |
778 | * The mask 'm' below will be a single "one" bit at | |
779 | * the position (inode->pos) | |
780 | */ | |
19baf839 | 781 | |
91b9a277 OJ |
782 | /* Use the old key, but set the new significant |
783 | * bit to zero. | |
784 | */ | |
2f36895a | 785 | |
91b9a277 OJ |
786 | left = (struct tnode *) tnode_get_child(tn, 2*i); |
787 | put_child(t, tn, 2*i, NULL); | |
2f36895a | 788 | |
91b9a277 | 789 | BUG_ON(!left); |
2f36895a | 790 | |
91b9a277 OJ |
791 | right = (struct tnode *) tnode_get_child(tn, 2*i+1); |
792 | put_child(t, tn, 2*i+1, NULL); | |
19baf839 | 793 | |
91b9a277 | 794 | BUG_ON(!right); |
19baf839 | 795 | |
91b9a277 OJ |
796 | size = tnode_child_length(left); |
797 | for (j = 0; j < size; j++) { | |
798 | put_child(t, left, j, inode->child[j]); | |
799 | put_child(t, right, j, inode->child[j + size]); | |
19baf839 | 800 | } |
91b9a277 OJ |
801 | put_child(t, tn, 2*i, resize(t, left)); |
802 | put_child(t, tn, 2*i+1, resize(t, right)); | |
803 | ||
804 | tnode_free(inode); | |
19baf839 RO |
805 | } |
806 | tnode_free(oldtnode); | |
807 | return tn; | |
2f80b3c8 RO |
808 | nomem: |
809 | { | |
810 | int size = tnode_child_length(tn); | |
811 | int j; | |
812 | ||
0c7770c7 | 813 | for (j = 0; j < size; j++) |
2f80b3c8 RO |
814 | if (tn->child[j]) |
815 | tnode_free((struct tnode *)tn->child[j]); | |
816 | ||
817 | tnode_free(tn); | |
0c7770c7 | 818 | |
2f80b3c8 RO |
819 | return ERR_PTR(-ENOMEM); |
820 | } | |
19baf839 RO |
821 | } |
822 | ||
2f80b3c8 | 823 | static struct tnode *halve(struct trie *t, struct tnode *tn) |
19baf839 RO |
824 | { |
825 | struct tnode *oldtnode = tn; | |
826 | struct node *left, *right; | |
827 | int i; | |
828 | int olen = tnode_child_length(tn); | |
829 | ||
0c7770c7 | 830 | pr_debug("In halve\n"); |
c877efb2 SH |
831 | |
832 | tn = tnode_new(oldtnode->key, oldtnode->pos, oldtnode->bits - 1); | |
19baf839 | 833 | |
2f80b3c8 RO |
834 | if (!tn) |
835 | return ERR_PTR(-ENOMEM); | |
2f36895a RO |
836 | |
837 | /* | |
c877efb2 SH |
838 | * Preallocate and store tnodes before the actual work so we |
839 | * don't get into an inconsistent state if memory allocation | |
840 | * fails. In case of failure we return the oldnode and halve | |
2f36895a RO |
841 | * of tnode is ignored. |
842 | */ | |
843 | ||
91b9a277 | 844 | for (i = 0; i < olen; i += 2) { |
2f36895a RO |
845 | left = tnode_get_child(oldtnode, i); |
846 | right = tnode_get_child(oldtnode, i+1); | |
c877efb2 | 847 | |
2f36895a | 848 | /* Two nonempty children */ |
0c7770c7 | 849 | if (left && right) { |
2f80b3c8 | 850 | struct tnode *newn; |
0c7770c7 | 851 | |
2f80b3c8 | 852 | newn = tnode_new(left->key, tn->pos + tn->bits, 1); |
0c7770c7 SH |
853 | |
854 | if (!newn) | |
2f80b3c8 | 855 | goto nomem; |
0c7770c7 | 856 | |
2f80b3c8 | 857 | put_child(t, tn, i/2, (struct node *)newn); |
2f36895a | 858 | } |
2f36895a | 859 | |
2f36895a | 860 | } |
19baf839 | 861 | |
91b9a277 OJ |
862 | for (i = 0; i < olen; i += 2) { |
863 | struct tnode *newBinNode; | |
864 | ||
19baf839 RO |
865 | left = tnode_get_child(oldtnode, i); |
866 | right = tnode_get_child(oldtnode, i+1); | |
c877efb2 | 867 | |
19baf839 RO |
868 | /* At least one of the children is empty */ |
869 | if (left == NULL) { | |
870 | if (right == NULL) /* Both are empty */ | |
871 | continue; | |
872 | put_child(t, tn, i/2, right); | |
91b9a277 | 873 | continue; |
0c7770c7 | 874 | } |
91b9a277 OJ |
875 | |
876 | if (right == NULL) { | |
19baf839 | 877 | put_child(t, tn, i/2, left); |
91b9a277 OJ |
878 | continue; |
879 | } | |
c877efb2 | 880 | |
19baf839 | 881 | /* Two nonempty children */ |
91b9a277 OJ |
882 | newBinNode = (struct tnode *) tnode_get_child(tn, i/2); |
883 | put_child(t, tn, i/2, NULL); | |
91b9a277 OJ |
884 | put_child(t, newBinNode, 0, left); |
885 | put_child(t, newBinNode, 1, right); | |
886 | put_child(t, tn, i/2, resize(t, newBinNode)); | |
19baf839 RO |
887 | } |
888 | tnode_free(oldtnode); | |
889 | return tn; | |
2f80b3c8 RO |
890 | nomem: |
891 | { | |
892 | int size = tnode_child_length(tn); | |
893 | int j; | |
894 | ||
0c7770c7 | 895 | for (j = 0; j < size; j++) |
2f80b3c8 RO |
896 | if (tn->child[j]) |
897 | tnode_free((struct tnode *)tn->child[j]); | |
898 | ||
899 | tnode_free(tn); | |
0c7770c7 | 900 | |
2f80b3c8 RO |
901 | return ERR_PTR(-ENOMEM); |
902 | } | |
19baf839 RO |
903 | } |
904 | ||
772cb712 | 905 | /* readside must use rcu_read_lock currently dump routines |
2373ce1c RO |
906 | via get_fa_head and dump */ |
907 | ||
772cb712 | 908 | static struct leaf_info *find_leaf_info(struct leaf *l, int plen) |
19baf839 | 909 | { |
772cb712 | 910 | struct hlist_head *head = &l->list; |
19baf839 RO |
911 | struct hlist_node *node; |
912 | struct leaf_info *li; | |
913 | ||
2373ce1c | 914 | hlist_for_each_entry_rcu(li, node, head, hlist) |
c877efb2 | 915 | if (li->plen == plen) |
19baf839 | 916 | return li; |
91b9a277 | 917 | |
19baf839 RO |
918 | return NULL; |
919 | } | |
920 | ||
a07f5f50 | 921 | static inline struct list_head *get_fa_head(struct leaf *l, int plen) |
19baf839 | 922 | { |
772cb712 | 923 | struct leaf_info *li = find_leaf_info(l, plen); |
c877efb2 | 924 | |
91b9a277 OJ |
925 | if (!li) |
926 | return NULL; | |
c877efb2 | 927 | |
91b9a277 | 928 | return &li->falh; |
19baf839 RO |
929 | } |
930 | ||
931 | static void insert_leaf_info(struct hlist_head *head, struct leaf_info *new) | |
932 | { | |
e905a9ed YH |
933 | struct leaf_info *li = NULL, *last = NULL; |
934 | struct hlist_node *node; | |
935 | ||
936 | if (hlist_empty(head)) { | |
937 | hlist_add_head_rcu(&new->hlist, head); | |
938 | } else { | |
939 | hlist_for_each_entry(li, node, head, hlist) { | |
940 | if (new->plen > li->plen) | |
941 | break; | |
942 | ||
943 | last = li; | |
944 | } | |
945 | if (last) | |
946 | hlist_add_after_rcu(&last->hlist, &new->hlist); | |
947 | else | |
948 | hlist_add_before_rcu(&new->hlist, &li->hlist); | |
949 | } | |
19baf839 RO |
950 | } |
951 | ||
2373ce1c RO |
952 | /* rcu_read_lock needs to be hold by caller from readside */ |
953 | ||
19baf839 RO |
954 | static struct leaf * |
955 | fib_find_node(struct trie *t, u32 key) | |
956 | { | |
957 | int pos; | |
958 | struct tnode *tn; | |
959 | struct node *n; | |
960 | ||
961 | pos = 0; | |
2373ce1c | 962 | n = rcu_dereference(t->trie); |
19baf839 RO |
963 | |
964 | while (n != NULL && NODE_TYPE(n) == T_TNODE) { | |
965 | tn = (struct tnode *) n; | |
91b9a277 | 966 | |
19baf839 | 967 | check_tnode(tn); |
91b9a277 | 968 | |
c877efb2 | 969 | if (tkey_sub_equals(tn->key, pos, tn->pos-pos, key)) { |
91b9a277 | 970 | pos = tn->pos + tn->bits; |
a07f5f50 SH |
971 | n = tnode_get_child_rcu(tn, |
972 | tkey_extract_bits(key, | |
973 | tn->pos, | |
974 | tn->bits)); | |
91b9a277 | 975 | } else |
19baf839 RO |
976 | break; |
977 | } | |
978 | /* Case we have found a leaf. Compare prefixes */ | |
979 | ||
91b9a277 OJ |
980 | if (n != NULL && IS_LEAF(n) && tkey_equals(key, n->key)) |
981 | return (struct leaf *)n; | |
982 | ||
19baf839 RO |
983 | return NULL; |
984 | } | |
985 | ||
986 | static struct node *trie_rebalance(struct trie *t, struct tnode *tn) | |
987 | { | |
19baf839 | 988 | int wasfull; |
06801916 SH |
989 | t_key cindex, key = tn->key; |
990 | struct tnode *tp; | |
19baf839 | 991 | |
06801916 | 992 | while (tn != NULL && (tp = node_parent((struct node *)tn)) != NULL) { |
19baf839 RO |
993 | cindex = tkey_extract_bits(key, tp->pos, tp->bits); |
994 | wasfull = tnode_full(tp, tnode_get_child(tp, cindex)); | |
a07f5f50 SH |
995 | tn = (struct tnode *) resize(t, (struct tnode *)tn); |
996 | ||
997 | tnode_put_child_reorg((struct tnode *)tp, cindex, | |
998 | (struct node *)tn, wasfull); | |
91b9a277 | 999 | |
06801916 SH |
1000 | tp = node_parent((struct node *) tn); |
1001 | if (!tp) | |
19baf839 | 1002 | break; |
06801916 | 1003 | tn = tp; |
19baf839 | 1004 | } |
06801916 | 1005 | |
19baf839 | 1006 | /* Handle last (top) tnode */ |
c877efb2 | 1007 | if (IS_TNODE(tn)) |
a07f5f50 | 1008 | tn = (struct tnode *)resize(t, (struct tnode *)tn); |
19baf839 | 1009 | |
a07f5f50 | 1010 | return (struct node *)tn; |
19baf839 RO |
1011 | } |
1012 | ||
2373ce1c RO |
1013 | /* only used from updater-side */ |
1014 | ||
fea86ad8 | 1015 | static struct list_head *fib_insert_node(struct trie *t, u32 key, int plen) |
19baf839 RO |
1016 | { |
1017 | int pos, newpos; | |
1018 | struct tnode *tp = NULL, *tn = NULL; | |
1019 | struct node *n; | |
1020 | struct leaf *l; | |
1021 | int missbit; | |
c877efb2 | 1022 | struct list_head *fa_head = NULL; |
19baf839 RO |
1023 | struct leaf_info *li; |
1024 | t_key cindex; | |
1025 | ||
1026 | pos = 0; | |
c877efb2 | 1027 | n = t->trie; |
19baf839 | 1028 | |
c877efb2 SH |
1029 | /* If we point to NULL, stop. Either the tree is empty and we should |
1030 | * just put a new leaf in if, or we have reached an empty child slot, | |
19baf839 | 1031 | * and we should just put our new leaf in that. |
c877efb2 SH |
1032 | * If we point to a T_TNODE, check if it matches our key. Note that |
1033 | * a T_TNODE might be skipping any number of bits - its 'pos' need | |
19baf839 RO |
1034 | * not be the parent's 'pos'+'bits'! |
1035 | * | |
c877efb2 | 1036 | * If it does match the current key, get pos/bits from it, extract |
19baf839 RO |
1037 | * the index from our key, push the T_TNODE and walk the tree. |
1038 | * | |
1039 | * If it doesn't, we have to replace it with a new T_TNODE. | |
1040 | * | |
c877efb2 SH |
1041 | * If we point to a T_LEAF, it might or might not have the same key |
1042 | * as we do. If it does, just change the value, update the T_LEAF's | |
1043 | * value, and return it. | |
19baf839 RO |
1044 | * If it doesn't, we need to replace it with a T_TNODE. |
1045 | */ | |
1046 | ||
1047 | while (n != NULL && NODE_TYPE(n) == T_TNODE) { | |
1048 | tn = (struct tnode *) n; | |
91b9a277 | 1049 | |
c877efb2 | 1050 | check_tnode(tn); |
91b9a277 | 1051 | |
c877efb2 | 1052 | if (tkey_sub_equals(tn->key, pos, tn->pos-pos, key)) { |
19baf839 | 1053 | tp = tn; |
91b9a277 | 1054 | pos = tn->pos + tn->bits; |
a07f5f50 SH |
1055 | n = tnode_get_child(tn, |
1056 | tkey_extract_bits(key, | |
1057 | tn->pos, | |
1058 | tn->bits)); | |
19baf839 | 1059 | |
06801916 | 1060 | BUG_ON(n && node_parent(n) != tn); |
91b9a277 | 1061 | } else |
19baf839 RO |
1062 | break; |
1063 | } | |
1064 | ||
1065 | /* | |
1066 | * n ----> NULL, LEAF or TNODE | |
1067 | * | |
c877efb2 | 1068 | * tp is n's (parent) ----> NULL or TNODE |
19baf839 RO |
1069 | */ |
1070 | ||
91b9a277 | 1071 | BUG_ON(tp && IS_LEAF(tp)); |
19baf839 RO |
1072 | |
1073 | /* Case 1: n is a leaf. Compare prefixes */ | |
1074 | ||
c877efb2 | 1075 | if (n != NULL && IS_LEAF(n) && tkey_equals(key, n->key)) { |
c95aaf9a | 1076 | l = (struct leaf *) n; |
19baf839 | 1077 | li = leaf_info_new(plen); |
91b9a277 | 1078 | |
fea86ad8 SH |
1079 | if (!li) |
1080 | return NULL; | |
19baf839 RO |
1081 | |
1082 | fa_head = &li->falh; | |
1083 | insert_leaf_info(&l->list, li); | |
1084 | goto done; | |
1085 | } | |
19baf839 RO |
1086 | l = leaf_new(); |
1087 | ||
fea86ad8 SH |
1088 | if (!l) |
1089 | return NULL; | |
19baf839 RO |
1090 | |
1091 | l->key = key; | |
1092 | li = leaf_info_new(plen); | |
1093 | ||
c877efb2 | 1094 | if (!li) { |
387a5487 | 1095 | free_leaf(l); |
fea86ad8 | 1096 | return NULL; |
f835e471 | 1097 | } |
19baf839 RO |
1098 | |
1099 | fa_head = &li->falh; | |
1100 | insert_leaf_info(&l->list, li); | |
1101 | ||
19baf839 | 1102 | if (t->trie && n == NULL) { |
91b9a277 | 1103 | /* Case 2: n is NULL, and will just insert a new leaf */ |
19baf839 | 1104 | |
06801916 | 1105 | node_set_parent((struct node *)l, tp); |
19baf839 | 1106 | |
91b9a277 OJ |
1107 | cindex = tkey_extract_bits(key, tp->pos, tp->bits); |
1108 | put_child(t, (struct tnode *)tp, cindex, (struct node *)l); | |
1109 | } else { | |
1110 | /* Case 3: n is a LEAF or a TNODE and the key doesn't match. */ | |
c877efb2 SH |
1111 | /* |
1112 | * Add a new tnode here | |
19baf839 RO |
1113 | * first tnode need some special handling |
1114 | */ | |
1115 | ||
1116 | if (tp) | |
91b9a277 | 1117 | pos = tp->pos+tp->bits; |
19baf839 | 1118 | else |
91b9a277 OJ |
1119 | pos = 0; |
1120 | ||
c877efb2 | 1121 | if (n) { |
19baf839 RO |
1122 | newpos = tkey_mismatch(key, pos, n->key); |
1123 | tn = tnode_new(n->key, newpos, 1); | |
91b9a277 | 1124 | } else { |
19baf839 | 1125 | newpos = 0; |
c877efb2 | 1126 | tn = tnode_new(key, newpos, 1); /* First tnode */ |
19baf839 | 1127 | } |
19baf839 | 1128 | |
c877efb2 | 1129 | if (!tn) { |
f835e471 | 1130 | free_leaf_info(li); |
387a5487 | 1131 | free_leaf(l); |
fea86ad8 | 1132 | return NULL; |
91b9a277 OJ |
1133 | } |
1134 | ||
06801916 | 1135 | node_set_parent((struct node *)tn, tp); |
19baf839 | 1136 | |
91b9a277 | 1137 | missbit = tkey_extract_bits(key, newpos, 1); |
19baf839 RO |
1138 | put_child(t, tn, missbit, (struct node *)l); |
1139 | put_child(t, tn, 1-missbit, n); | |
1140 | ||
c877efb2 | 1141 | if (tp) { |
19baf839 | 1142 | cindex = tkey_extract_bits(key, tp->pos, tp->bits); |
a07f5f50 SH |
1143 | put_child(t, (struct tnode *)tp, cindex, |
1144 | (struct node *)tn); | |
91b9a277 | 1145 | } else { |
a07f5f50 | 1146 | rcu_assign_pointer(t->trie, (struct node *)tn); |
19baf839 RO |
1147 | tp = tn; |
1148 | } | |
1149 | } | |
91b9a277 OJ |
1150 | |
1151 | if (tp && tp->pos + tp->bits > 32) | |
a07f5f50 SH |
1152 | pr_warning("fib_trie" |
1153 | " tp=%p pos=%d, bits=%d, key=%0x plen=%d\n", | |
1154 | tp, tp->pos, tp->bits, key, plen); | |
91b9a277 | 1155 | |
19baf839 | 1156 | /* Rebalance the trie */ |
2373ce1c RO |
1157 | |
1158 | rcu_assign_pointer(t->trie, trie_rebalance(t, tp)); | |
f835e471 | 1159 | done: |
19baf839 RO |
1160 | return fa_head; |
1161 | } | |
1162 | ||
d562f1f8 RO |
1163 | /* |
1164 | * Caller must hold RTNL. | |
1165 | */ | |
4e902c57 | 1166 | static int fn_trie_insert(struct fib_table *tb, struct fib_config *cfg) |
19baf839 RO |
1167 | { |
1168 | struct trie *t = (struct trie *) tb->tb_data; | |
1169 | struct fib_alias *fa, *new_fa; | |
c877efb2 | 1170 | struct list_head *fa_head = NULL; |
19baf839 | 1171 | struct fib_info *fi; |
4e902c57 TG |
1172 | int plen = cfg->fc_dst_len; |
1173 | u8 tos = cfg->fc_tos; | |
19baf839 RO |
1174 | u32 key, mask; |
1175 | int err; | |
1176 | struct leaf *l; | |
1177 | ||
1178 | if (plen > 32) | |
1179 | return -EINVAL; | |
1180 | ||
4e902c57 | 1181 | key = ntohl(cfg->fc_dst); |
19baf839 | 1182 | |
2dfe55b4 | 1183 | pr_debug("Insert table=%u %08x/%d\n", tb->tb_id, key, plen); |
19baf839 | 1184 | |
91b9a277 | 1185 | mask = ntohl(inet_make_mask(plen)); |
19baf839 | 1186 | |
c877efb2 | 1187 | if (key & ~mask) |
19baf839 RO |
1188 | return -EINVAL; |
1189 | ||
1190 | key = key & mask; | |
1191 | ||
4e902c57 TG |
1192 | fi = fib_create_info(cfg); |
1193 | if (IS_ERR(fi)) { | |
1194 | err = PTR_ERR(fi); | |
19baf839 | 1195 | goto err; |
4e902c57 | 1196 | } |
19baf839 RO |
1197 | |
1198 | l = fib_find_node(t, key); | |
c877efb2 | 1199 | fa = NULL; |
19baf839 | 1200 | |
c877efb2 | 1201 | if (l) { |
19baf839 RO |
1202 | fa_head = get_fa_head(l, plen); |
1203 | fa = fib_find_alias(fa_head, tos, fi->fib_priority); | |
1204 | } | |
1205 | ||
1206 | /* Now fa, if non-NULL, points to the first fib alias | |
1207 | * with the same keys [prefix,tos,priority], if such key already | |
1208 | * exists or to the node before which we will insert new one. | |
1209 | * | |
1210 | * If fa is NULL, we will need to allocate a new one and | |
1211 | * insert to the head of f. | |
1212 | * | |
1213 | * If f is NULL, no fib node matched the destination key | |
1214 | * and we need to allocate a new one of those as well. | |
1215 | */ | |
1216 | ||
936f6f8e JA |
1217 | if (fa && fa->fa_tos == tos && |
1218 | fa->fa_info->fib_priority == fi->fib_priority) { | |
1219 | struct fib_alias *fa_first, *fa_match; | |
19baf839 RO |
1220 | |
1221 | err = -EEXIST; | |
4e902c57 | 1222 | if (cfg->fc_nlflags & NLM_F_EXCL) |
19baf839 RO |
1223 | goto out; |
1224 | ||
936f6f8e JA |
1225 | /* We have 2 goals: |
1226 | * 1. Find exact match for type, scope, fib_info to avoid | |
1227 | * duplicate routes | |
1228 | * 2. Find next 'fa' (or head), NLM_F_APPEND inserts before it | |
1229 | */ | |
1230 | fa_match = NULL; | |
1231 | fa_first = fa; | |
1232 | fa = list_entry(fa->fa_list.prev, struct fib_alias, fa_list); | |
1233 | list_for_each_entry_continue(fa, fa_head, fa_list) { | |
1234 | if (fa->fa_tos != tos) | |
1235 | break; | |
1236 | if (fa->fa_info->fib_priority != fi->fib_priority) | |
1237 | break; | |
1238 | if (fa->fa_type == cfg->fc_type && | |
1239 | fa->fa_scope == cfg->fc_scope && | |
1240 | fa->fa_info == fi) { | |
1241 | fa_match = fa; | |
1242 | break; | |
1243 | } | |
1244 | } | |
1245 | ||
4e902c57 | 1246 | if (cfg->fc_nlflags & NLM_F_REPLACE) { |
19baf839 RO |
1247 | struct fib_info *fi_drop; |
1248 | u8 state; | |
1249 | ||
936f6f8e JA |
1250 | fa = fa_first; |
1251 | if (fa_match) { | |
1252 | if (fa == fa_match) | |
1253 | err = 0; | |
6725033f | 1254 | goto out; |
936f6f8e | 1255 | } |
2373ce1c | 1256 | err = -ENOBUFS; |
e94b1766 | 1257 | new_fa = kmem_cache_alloc(fn_alias_kmem, GFP_KERNEL); |
2373ce1c RO |
1258 | if (new_fa == NULL) |
1259 | goto out; | |
19baf839 RO |
1260 | |
1261 | fi_drop = fa->fa_info; | |
2373ce1c RO |
1262 | new_fa->fa_tos = fa->fa_tos; |
1263 | new_fa->fa_info = fi; | |
4e902c57 TG |
1264 | new_fa->fa_type = cfg->fc_type; |
1265 | new_fa->fa_scope = cfg->fc_scope; | |
19baf839 | 1266 | state = fa->fa_state; |
936f6f8e | 1267 | new_fa->fa_state = state & ~FA_S_ACCESSED; |
19baf839 | 1268 | |
2373ce1c RO |
1269 | list_replace_rcu(&fa->fa_list, &new_fa->fa_list); |
1270 | alias_free_mem_rcu(fa); | |
19baf839 RO |
1271 | |
1272 | fib_release_info(fi_drop); | |
1273 | if (state & FA_S_ACCESSED) | |
91b9a277 | 1274 | rt_cache_flush(-1); |
b8f55831 MK |
1275 | rtmsg_fib(RTM_NEWROUTE, htonl(key), new_fa, plen, |
1276 | tb->tb_id, &cfg->fc_nlinfo, NLM_F_REPLACE); | |
19baf839 | 1277 | |
91b9a277 | 1278 | goto succeeded; |
19baf839 RO |
1279 | } |
1280 | /* Error if we find a perfect match which | |
1281 | * uses the same scope, type, and nexthop | |
1282 | * information. | |
1283 | */ | |
936f6f8e JA |
1284 | if (fa_match) |
1285 | goto out; | |
a07f5f50 | 1286 | |
4e902c57 | 1287 | if (!(cfg->fc_nlflags & NLM_F_APPEND)) |
936f6f8e | 1288 | fa = fa_first; |
19baf839 RO |
1289 | } |
1290 | err = -ENOENT; | |
4e902c57 | 1291 | if (!(cfg->fc_nlflags & NLM_F_CREATE)) |
19baf839 RO |
1292 | goto out; |
1293 | ||
1294 | err = -ENOBUFS; | |
e94b1766 | 1295 | new_fa = kmem_cache_alloc(fn_alias_kmem, GFP_KERNEL); |
19baf839 RO |
1296 | if (new_fa == NULL) |
1297 | goto out; | |
1298 | ||
1299 | new_fa->fa_info = fi; | |
1300 | new_fa->fa_tos = tos; | |
4e902c57 TG |
1301 | new_fa->fa_type = cfg->fc_type; |
1302 | new_fa->fa_scope = cfg->fc_scope; | |
19baf839 | 1303 | new_fa->fa_state = 0; |
19baf839 RO |
1304 | /* |
1305 | * Insert new entry to the list. | |
1306 | */ | |
1307 | ||
c877efb2 | 1308 | if (!fa_head) { |
fea86ad8 SH |
1309 | fa_head = fib_insert_node(t, key, plen); |
1310 | if (unlikely(!fa_head)) { | |
1311 | err = -ENOMEM; | |
f835e471 | 1312 | goto out_free_new_fa; |
fea86ad8 | 1313 | } |
f835e471 | 1314 | } |
19baf839 | 1315 | |
2373ce1c RO |
1316 | list_add_tail_rcu(&new_fa->fa_list, |
1317 | (fa ? &fa->fa_list : fa_head)); | |
19baf839 RO |
1318 | |
1319 | rt_cache_flush(-1); | |
4e902c57 | 1320 | rtmsg_fib(RTM_NEWROUTE, htonl(key), new_fa, plen, tb->tb_id, |
b8f55831 | 1321 | &cfg->fc_nlinfo, 0); |
19baf839 RO |
1322 | succeeded: |
1323 | return 0; | |
f835e471 RO |
1324 | |
1325 | out_free_new_fa: | |
1326 | kmem_cache_free(fn_alias_kmem, new_fa); | |
19baf839 RO |
1327 | out: |
1328 | fib_release_info(fi); | |
91b9a277 | 1329 | err: |
19baf839 RO |
1330 | return err; |
1331 | } | |
1332 | ||
772cb712 | 1333 | /* should be called with rcu_read_lock */ |
a07f5f50 SH |
1334 | static int check_leaf(struct trie *t, struct leaf *l, |
1335 | t_key key, const struct flowi *flp, | |
1336 | struct fib_result *res) | |
19baf839 | 1337 | { |
19baf839 RO |
1338 | struct leaf_info *li; |
1339 | struct hlist_head *hhead = &l->list; | |
1340 | struct hlist_node *node; | |
c877efb2 | 1341 | |
2373ce1c | 1342 | hlist_for_each_entry_rcu(li, node, hhead, hlist) { |
a07f5f50 SH |
1343 | int err; |
1344 | int plen = li->plen; | |
1345 | __be32 mask = inet_make_mask(plen); | |
1346 | ||
888454c5 | 1347 | if (l->key != (key & ntohl(mask))) |
19baf839 RO |
1348 | continue; |
1349 | ||
a07f5f50 SH |
1350 | err = fib_semantic_match(&li->falh, flp, res, |
1351 | htonl(l->key), mask, plen); | |
1352 | ||
19baf839 | 1353 | #ifdef CONFIG_IP_FIB_TRIE_STATS |
a07f5f50 | 1354 | if (err <= 0) |
19baf839 | 1355 | t->stats.semantic_match_passed++; |
a07f5f50 SH |
1356 | else |
1357 | t->stats.semantic_match_miss++; | |
19baf839 | 1358 | #endif |
a07f5f50 SH |
1359 | if (err <= 0) |
1360 | return plen; | |
19baf839 | 1361 | } |
a07f5f50 SH |
1362 | |
1363 | return -1; | |
19baf839 RO |
1364 | } |
1365 | ||
a07f5f50 SH |
1366 | static int fn_trie_lookup(struct fib_table *tb, const struct flowi *flp, |
1367 | struct fib_result *res) | |
19baf839 RO |
1368 | { |
1369 | struct trie *t = (struct trie *) tb->tb_data; | |
1370 | int plen, ret = 0; | |
1371 | struct node *n; | |
1372 | struct tnode *pn; | |
1373 | int pos, bits; | |
91b9a277 | 1374 | t_key key = ntohl(flp->fl4_dst); |
19baf839 RO |
1375 | int chopped_off; |
1376 | t_key cindex = 0; | |
1377 | int current_prefix_length = KEYLENGTH; | |
91b9a277 OJ |
1378 | struct tnode *cn; |
1379 | t_key node_prefix, key_prefix, pref_mismatch; | |
1380 | int mp; | |
1381 | ||
2373ce1c | 1382 | rcu_read_lock(); |
91b9a277 | 1383 | |
2373ce1c | 1384 | n = rcu_dereference(t->trie); |
c877efb2 | 1385 | if (!n) |
19baf839 RO |
1386 | goto failed; |
1387 | ||
1388 | #ifdef CONFIG_IP_FIB_TRIE_STATS | |
1389 | t->stats.gets++; | |
1390 | #endif | |
1391 | ||
1392 | /* Just a leaf? */ | |
1393 | if (IS_LEAF(n)) { | |
a07f5f50 SH |
1394 | plen = check_leaf(t, (struct leaf *)n, key, flp, res); |
1395 | if (plen < 0) | |
1396 | goto failed; | |
1397 | ret = 0; | |
1398 | goto found; | |
19baf839 | 1399 | } |
a07f5f50 | 1400 | |
19baf839 RO |
1401 | pn = (struct tnode *) n; |
1402 | chopped_off = 0; | |
c877efb2 | 1403 | |
91b9a277 | 1404 | while (pn) { |
19baf839 RO |
1405 | pos = pn->pos; |
1406 | bits = pn->bits; | |
1407 | ||
c877efb2 | 1408 | if (!chopped_off) |
ab66b4a7 SH |
1409 | cindex = tkey_extract_bits(mask_pfx(key, current_prefix_length), |
1410 | pos, bits); | |
19baf839 RO |
1411 | |
1412 | n = tnode_get_child(pn, cindex); | |
1413 | ||
1414 | if (n == NULL) { | |
1415 | #ifdef CONFIG_IP_FIB_TRIE_STATS | |
1416 | t->stats.null_node_hit++; | |
1417 | #endif | |
1418 | goto backtrace; | |
1419 | } | |
1420 | ||
91b9a277 | 1421 | if (IS_LEAF(n)) { |
a07f5f50 SH |
1422 | plen = check_leaf(t, (struct leaf *)n, key, flp, res); |
1423 | if (plen < 0) | |
91b9a277 | 1424 | goto backtrace; |
a07f5f50 SH |
1425 | |
1426 | ret = 0; | |
1427 | goto found; | |
91b9a277 OJ |
1428 | } |
1429 | ||
91b9a277 | 1430 | cn = (struct tnode *)n; |
19baf839 | 1431 | |
91b9a277 OJ |
1432 | /* |
1433 | * It's a tnode, and we can do some extra checks here if we | |
1434 | * like, to avoid descending into a dead-end branch. | |
1435 | * This tnode is in the parent's child array at index | |
1436 | * key[p_pos..p_pos+p_bits] but potentially with some bits | |
1437 | * chopped off, so in reality the index may be just a | |
1438 | * subprefix, padded with zero at the end. | |
1439 | * We can also take a look at any skipped bits in this | |
1440 | * tnode - everything up to p_pos is supposed to be ok, | |
1441 | * and the non-chopped bits of the index (se previous | |
1442 | * paragraph) are also guaranteed ok, but the rest is | |
1443 | * considered unknown. | |
1444 | * | |
1445 | * The skipped bits are key[pos+bits..cn->pos]. | |
1446 | */ | |
19baf839 | 1447 | |
91b9a277 OJ |
1448 | /* If current_prefix_length < pos+bits, we are already doing |
1449 | * actual prefix matching, which means everything from | |
1450 | * pos+(bits-chopped_off) onward must be zero along some | |
1451 | * branch of this subtree - otherwise there is *no* valid | |
1452 | * prefix present. Here we can only check the skipped | |
1453 | * bits. Remember, since we have already indexed into the | |
1454 | * parent's child array, we know that the bits we chopped of | |
1455 | * *are* zero. | |
1456 | */ | |
19baf839 | 1457 | |
a07f5f50 SH |
1458 | /* NOTA BENE: Checking only skipped bits |
1459 | for the new node here */ | |
19baf839 | 1460 | |
91b9a277 OJ |
1461 | if (current_prefix_length < pos+bits) { |
1462 | if (tkey_extract_bits(cn->key, current_prefix_length, | |
a07f5f50 SH |
1463 | cn->pos - current_prefix_length) |
1464 | || !(cn->child[0])) | |
91b9a277 OJ |
1465 | goto backtrace; |
1466 | } | |
19baf839 | 1467 | |
91b9a277 OJ |
1468 | /* |
1469 | * If chopped_off=0, the index is fully validated and we | |
1470 | * only need to look at the skipped bits for this, the new, | |
1471 | * tnode. What we actually want to do is to find out if | |
1472 | * these skipped bits match our key perfectly, or if we will | |
1473 | * have to count on finding a matching prefix further down, | |
1474 | * because if we do, we would like to have some way of | |
1475 | * verifying the existence of such a prefix at this point. | |
1476 | */ | |
19baf839 | 1477 | |
91b9a277 OJ |
1478 | /* The only thing we can do at this point is to verify that |
1479 | * any such matching prefix can indeed be a prefix to our | |
1480 | * key, and if the bits in the node we are inspecting that | |
1481 | * do not match our key are not ZERO, this cannot be true. | |
1482 | * Thus, find out where there is a mismatch (before cn->pos) | |
1483 | * and verify that all the mismatching bits are zero in the | |
1484 | * new tnode's key. | |
1485 | */ | |
19baf839 | 1486 | |
a07f5f50 SH |
1487 | /* |
1488 | * Note: We aren't very concerned about the piece of | |
1489 | * the key that precede pn->pos+pn->bits, since these | |
1490 | * have already been checked. The bits after cn->pos | |
1491 | * aren't checked since these are by definition | |
1492 | * "unknown" at this point. Thus, what we want to see | |
1493 | * is if we are about to enter the "prefix matching" | |
1494 | * state, and in that case verify that the skipped | |
1495 | * bits that will prevail throughout this subtree are | |
1496 | * zero, as they have to be if we are to find a | |
1497 | * matching prefix. | |
91b9a277 OJ |
1498 | */ |
1499 | ||
ab66b4a7 SH |
1500 | node_prefix = mask_pfx(cn->key, cn->pos); |
1501 | key_prefix = mask_pfx(key, cn->pos); | |
91b9a277 OJ |
1502 | pref_mismatch = key_prefix^node_prefix; |
1503 | mp = 0; | |
1504 | ||
a07f5f50 SH |
1505 | /* |
1506 | * In short: If skipped bits in this node do not match | |
1507 | * the search key, enter the "prefix matching" | |
1508 | * state.directly. | |
91b9a277 OJ |
1509 | */ |
1510 | if (pref_mismatch) { | |
1511 | while (!(pref_mismatch & (1<<(KEYLENGTH-1)))) { | |
1512 | mp++; | |
a07f5f50 | 1513 | pref_mismatch = pref_mismatch << 1; |
91b9a277 OJ |
1514 | } |
1515 | key_prefix = tkey_extract_bits(cn->key, mp, cn->pos-mp); | |
1516 | ||
1517 | if (key_prefix != 0) | |
1518 | goto backtrace; | |
1519 | ||
1520 | if (current_prefix_length >= cn->pos) | |
1521 | current_prefix_length = mp; | |
c877efb2 | 1522 | } |
a07f5f50 | 1523 | |
91b9a277 OJ |
1524 | pn = (struct tnode *)n; /* Descend */ |
1525 | chopped_off = 0; | |
1526 | continue; | |
1527 | ||
19baf839 RO |
1528 | backtrace: |
1529 | chopped_off++; | |
1530 | ||
1531 | /* As zero don't change the child key (cindex) */ | |
a07f5f50 SH |
1532 | while ((chopped_off <= pn->bits) |
1533 | && !(cindex & (1<<(chopped_off-1)))) | |
19baf839 | 1534 | chopped_off++; |
19baf839 RO |
1535 | |
1536 | /* Decrease current_... with bits chopped off */ | |
1537 | if (current_prefix_length > pn->pos + pn->bits - chopped_off) | |
a07f5f50 SH |
1538 | current_prefix_length = pn->pos + pn->bits |
1539 | - chopped_off; | |
91b9a277 | 1540 | |
19baf839 | 1541 | /* |
c877efb2 | 1542 | * Either we do the actual chop off according or if we have |
19baf839 RO |
1543 | * chopped off all bits in this tnode walk up to our parent. |
1544 | */ | |
1545 | ||
91b9a277 | 1546 | if (chopped_off <= pn->bits) { |
19baf839 | 1547 | cindex &= ~(1 << (chopped_off-1)); |
91b9a277 | 1548 | } else { |
06801916 SH |
1549 | struct tnode *parent = node_parent((struct node *) pn); |
1550 | if (!parent) | |
19baf839 | 1551 | goto failed; |
91b9a277 | 1552 | |
19baf839 | 1553 | /* Get Child's index */ |
06801916 SH |
1554 | cindex = tkey_extract_bits(pn->key, parent->pos, parent->bits); |
1555 | pn = parent; | |
19baf839 RO |
1556 | chopped_off = 0; |
1557 | ||
1558 | #ifdef CONFIG_IP_FIB_TRIE_STATS | |
1559 | t->stats.backtrack++; | |
1560 | #endif | |
1561 | goto backtrace; | |
c877efb2 | 1562 | } |
19baf839 RO |
1563 | } |
1564 | failed: | |
c877efb2 | 1565 | ret = 1; |
19baf839 | 1566 | found: |
2373ce1c | 1567 | rcu_read_unlock(); |
19baf839 RO |
1568 | return ret; |
1569 | } | |
1570 | ||
9195bef7 SH |
1571 | /* |
1572 | * Remove the leaf and return parent. | |
1573 | */ | |
1574 | static void trie_leaf_remove(struct trie *t, struct leaf *l) | |
19baf839 | 1575 | { |
9195bef7 | 1576 | struct tnode *tp = node_parent((struct node *) l); |
c877efb2 | 1577 | |
9195bef7 | 1578 | pr_debug("entering trie_leaf_remove(%p)\n", l); |
19baf839 | 1579 | |
c877efb2 | 1580 | if (tp) { |
9195bef7 | 1581 | t_key cindex = tkey_extract_bits(l->key, tp->pos, tp->bits); |
19baf839 | 1582 | put_child(t, (struct tnode *)tp, cindex, NULL); |
2373ce1c | 1583 | rcu_assign_pointer(t->trie, trie_rebalance(t, tp)); |
91b9a277 | 1584 | } else |
2373ce1c | 1585 | rcu_assign_pointer(t->trie, NULL); |
19baf839 | 1586 | |
387a5487 | 1587 | free_leaf(l); |
19baf839 RO |
1588 | } |
1589 | ||
d562f1f8 RO |
1590 | /* |
1591 | * Caller must hold RTNL. | |
1592 | */ | |
4e902c57 | 1593 | static int fn_trie_delete(struct fib_table *tb, struct fib_config *cfg) |
19baf839 RO |
1594 | { |
1595 | struct trie *t = (struct trie *) tb->tb_data; | |
1596 | u32 key, mask; | |
4e902c57 TG |
1597 | int plen = cfg->fc_dst_len; |
1598 | u8 tos = cfg->fc_tos; | |
19baf839 RO |
1599 | struct fib_alias *fa, *fa_to_delete; |
1600 | struct list_head *fa_head; | |
1601 | struct leaf *l; | |
91b9a277 OJ |
1602 | struct leaf_info *li; |
1603 | ||
c877efb2 | 1604 | if (plen > 32) |
19baf839 RO |
1605 | return -EINVAL; |
1606 | ||
4e902c57 | 1607 | key = ntohl(cfg->fc_dst); |
91b9a277 | 1608 | mask = ntohl(inet_make_mask(plen)); |
19baf839 | 1609 | |
c877efb2 | 1610 | if (key & ~mask) |
19baf839 RO |
1611 | return -EINVAL; |
1612 | ||
1613 | key = key & mask; | |
1614 | l = fib_find_node(t, key); | |
1615 | ||
c877efb2 | 1616 | if (!l) |
19baf839 RO |
1617 | return -ESRCH; |
1618 | ||
1619 | fa_head = get_fa_head(l, plen); | |
1620 | fa = fib_find_alias(fa_head, tos, 0); | |
1621 | ||
1622 | if (!fa) | |
1623 | return -ESRCH; | |
1624 | ||
0c7770c7 | 1625 | pr_debug("Deleting %08x/%d tos=%d t=%p\n", key, plen, tos, t); |
19baf839 RO |
1626 | |
1627 | fa_to_delete = NULL; | |
936f6f8e JA |
1628 | fa = list_entry(fa->fa_list.prev, struct fib_alias, fa_list); |
1629 | list_for_each_entry_continue(fa, fa_head, fa_list) { | |
19baf839 RO |
1630 | struct fib_info *fi = fa->fa_info; |
1631 | ||
1632 | if (fa->fa_tos != tos) | |
1633 | break; | |
1634 | ||
4e902c57 TG |
1635 | if ((!cfg->fc_type || fa->fa_type == cfg->fc_type) && |
1636 | (cfg->fc_scope == RT_SCOPE_NOWHERE || | |
1637 | fa->fa_scope == cfg->fc_scope) && | |
1638 | (!cfg->fc_protocol || | |
1639 | fi->fib_protocol == cfg->fc_protocol) && | |
1640 | fib_nh_match(cfg, fi) == 0) { | |
19baf839 RO |
1641 | fa_to_delete = fa; |
1642 | break; | |
1643 | } | |
1644 | } | |
1645 | ||
91b9a277 OJ |
1646 | if (!fa_to_delete) |
1647 | return -ESRCH; | |
19baf839 | 1648 | |
91b9a277 | 1649 | fa = fa_to_delete; |
4e902c57 | 1650 | rtmsg_fib(RTM_DELROUTE, htonl(key), fa, plen, tb->tb_id, |
b8f55831 | 1651 | &cfg->fc_nlinfo, 0); |
91b9a277 OJ |
1652 | |
1653 | l = fib_find_node(t, key); | |
772cb712 | 1654 | li = find_leaf_info(l, plen); |
19baf839 | 1655 | |
2373ce1c | 1656 | list_del_rcu(&fa->fa_list); |
19baf839 | 1657 | |
91b9a277 | 1658 | if (list_empty(fa_head)) { |
2373ce1c | 1659 | hlist_del_rcu(&li->hlist); |
91b9a277 | 1660 | free_leaf_info(li); |
2373ce1c | 1661 | } |
19baf839 | 1662 | |
91b9a277 | 1663 | if (hlist_empty(&l->list)) |
9195bef7 | 1664 | trie_leaf_remove(t, l); |
19baf839 | 1665 | |
91b9a277 OJ |
1666 | if (fa->fa_state & FA_S_ACCESSED) |
1667 | rt_cache_flush(-1); | |
19baf839 | 1668 | |
2373ce1c RO |
1669 | fib_release_info(fa->fa_info); |
1670 | alias_free_mem_rcu(fa); | |
91b9a277 | 1671 | return 0; |
19baf839 RO |
1672 | } |
1673 | ||
ef3660ce | 1674 | static int trie_flush_list(struct list_head *head) |
19baf839 RO |
1675 | { |
1676 | struct fib_alias *fa, *fa_node; | |
1677 | int found = 0; | |
1678 | ||
1679 | list_for_each_entry_safe(fa, fa_node, head, fa_list) { | |
1680 | struct fib_info *fi = fa->fa_info; | |
19baf839 | 1681 | |
2373ce1c RO |
1682 | if (fi && (fi->fib_flags & RTNH_F_DEAD)) { |
1683 | list_del_rcu(&fa->fa_list); | |
1684 | fib_release_info(fa->fa_info); | |
1685 | alias_free_mem_rcu(fa); | |
19baf839 RO |
1686 | found++; |
1687 | } | |
1688 | } | |
1689 | return found; | |
1690 | } | |
1691 | ||
ef3660ce | 1692 | static int trie_flush_leaf(struct leaf *l) |
19baf839 RO |
1693 | { |
1694 | int found = 0; | |
1695 | struct hlist_head *lih = &l->list; | |
1696 | struct hlist_node *node, *tmp; | |
1697 | struct leaf_info *li = NULL; | |
1698 | ||
1699 | hlist_for_each_entry_safe(li, node, tmp, lih, hlist) { | |
ef3660ce | 1700 | found += trie_flush_list(&li->falh); |
19baf839 RO |
1701 | |
1702 | if (list_empty(&li->falh)) { | |
2373ce1c | 1703 | hlist_del_rcu(&li->hlist); |
19baf839 RO |
1704 | free_leaf_info(li); |
1705 | } | |
1706 | } | |
1707 | return found; | |
1708 | } | |
1709 | ||
82cfbb00 SH |
1710 | /* |
1711 | * Scan for the next right leaf starting at node p->child[idx] | |
1712 | * Since we have back pointer, no recursion necessary. | |
1713 | */ | |
1714 | static struct leaf *leaf_walk_rcu(struct tnode *p, struct node *c) | |
19baf839 | 1715 | { |
82cfbb00 SH |
1716 | do { |
1717 | t_key idx; | |
c877efb2 | 1718 | |
c877efb2 | 1719 | if (c) |
82cfbb00 | 1720 | idx = tkey_extract_bits(c->key, p->pos, p->bits) + 1; |
c877efb2 | 1721 | else |
82cfbb00 | 1722 | idx = 0; |
2373ce1c | 1723 | |
82cfbb00 SH |
1724 | while (idx < 1u << p->bits) { |
1725 | c = tnode_get_child_rcu(p, idx++); | |
2373ce1c | 1726 | if (!c) |
91b9a277 OJ |
1727 | continue; |
1728 | ||
82cfbb00 SH |
1729 | if (IS_LEAF(c)) { |
1730 | prefetch(p->child[idx]); | |
1731 | return (struct leaf *) c; | |
19baf839 | 1732 | } |
82cfbb00 SH |
1733 | |
1734 | /* Rescan start scanning in new node */ | |
1735 | p = (struct tnode *) c; | |
1736 | idx = 0; | |
19baf839 | 1737 | } |
82cfbb00 SH |
1738 | |
1739 | /* Node empty, walk back up to parent */ | |
91b9a277 | 1740 | c = (struct node *) p; |
82cfbb00 SH |
1741 | } while ( (p = node_parent_rcu(c)) != NULL); |
1742 | ||
1743 | return NULL; /* Root of trie */ | |
1744 | } | |
1745 | ||
82cfbb00 SH |
1746 | static struct leaf *trie_firstleaf(struct trie *t) |
1747 | { | |
1748 | struct tnode *n = (struct tnode *) rcu_dereference(t->trie); | |
1749 | ||
1750 | if (!n) | |
1751 | return NULL; | |
1752 | ||
1753 | if (IS_LEAF(n)) /* trie is just a leaf */ | |
1754 | return (struct leaf *) n; | |
1755 | ||
1756 | return leaf_walk_rcu(n, NULL); | |
1757 | } | |
1758 | ||
1759 | static struct leaf *trie_nextleaf(struct leaf *l) | |
1760 | { | |
1761 | struct node *c = (struct node *) l; | |
1762 | struct tnode *p = node_parent(c); | |
1763 | ||
1764 | if (!p) | |
1765 | return NULL; /* trie with just one leaf */ | |
1766 | ||
1767 | return leaf_walk_rcu(p, c); | |
19baf839 RO |
1768 | } |
1769 | ||
71d67e66 SH |
1770 | static struct leaf *trie_leafindex(struct trie *t, int index) |
1771 | { | |
1772 | struct leaf *l = trie_firstleaf(t); | |
1773 | ||
ec28cf73 | 1774 | while (l && index-- > 0) |
71d67e66 | 1775 | l = trie_nextleaf(l); |
ec28cf73 | 1776 | |
71d67e66 SH |
1777 | return l; |
1778 | } | |
1779 | ||
1780 | ||
d562f1f8 RO |
1781 | /* |
1782 | * Caller must hold RTNL. | |
1783 | */ | |
19baf839 RO |
1784 | static int fn_trie_flush(struct fib_table *tb) |
1785 | { | |
1786 | struct trie *t = (struct trie *) tb->tb_data; | |
9195bef7 | 1787 | struct leaf *l, *ll = NULL; |
82cfbb00 | 1788 | int found = 0; |
19baf839 | 1789 | |
82cfbb00 | 1790 | for (l = trie_firstleaf(t); l; l = trie_nextleaf(l)) { |
ef3660ce | 1791 | found += trie_flush_leaf(l); |
19baf839 RO |
1792 | |
1793 | if (ll && hlist_empty(&ll->list)) | |
9195bef7 | 1794 | trie_leaf_remove(t, ll); |
19baf839 RO |
1795 | ll = l; |
1796 | } | |
1797 | ||
1798 | if (ll && hlist_empty(&ll->list)) | |
9195bef7 | 1799 | trie_leaf_remove(t, ll); |
19baf839 | 1800 | |
0c7770c7 | 1801 | pr_debug("trie_flush found=%d\n", found); |
19baf839 RO |
1802 | return found; |
1803 | } | |
1804 | ||
a07f5f50 SH |
1805 | static void fn_trie_select_default(struct fib_table *tb, |
1806 | const struct flowi *flp, | |
1807 | struct fib_result *res) | |
19baf839 RO |
1808 | { |
1809 | struct trie *t = (struct trie *) tb->tb_data; | |
1810 | int order, last_idx; | |
1811 | struct fib_info *fi = NULL; | |
1812 | struct fib_info *last_resort; | |
1813 | struct fib_alias *fa = NULL; | |
1814 | struct list_head *fa_head; | |
1815 | struct leaf *l; | |
1816 | ||
1817 | last_idx = -1; | |
1818 | last_resort = NULL; | |
1819 | order = -1; | |
1820 | ||
2373ce1c | 1821 | rcu_read_lock(); |
c877efb2 | 1822 | |
19baf839 | 1823 | l = fib_find_node(t, 0); |
c877efb2 | 1824 | if (!l) |
19baf839 RO |
1825 | goto out; |
1826 | ||
1827 | fa_head = get_fa_head(l, 0); | |
c877efb2 | 1828 | if (!fa_head) |
19baf839 RO |
1829 | goto out; |
1830 | ||
c877efb2 | 1831 | if (list_empty(fa_head)) |
19baf839 RO |
1832 | goto out; |
1833 | ||
2373ce1c | 1834 | list_for_each_entry_rcu(fa, fa_head, fa_list) { |
19baf839 | 1835 | struct fib_info *next_fi = fa->fa_info; |
91b9a277 | 1836 | |
19baf839 RO |
1837 | if (fa->fa_scope != res->scope || |
1838 | fa->fa_type != RTN_UNICAST) | |
1839 | continue; | |
91b9a277 | 1840 | |
19baf839 RO |
1841 | if (next_fi->fib_priority > res->fi->fib_priority) |
1842 | break; | |
1843 | if (!next_fi->fib_nh[0].nh_gw || | |
1844 | next_fi->fib_nh[0].nh_scope != RT_SCOPE_LINK) | |
1845 | continue; | |
1846 | fa->fa_state |= FA_S_ACCESSED; | |
91b9a277 | 1847 | |
19baf839 RO |
1848 | if (fi == NULL) { |
1849 | if (next_fi != res->fi) | |
1850 | break; | |
1851 | } else if (!fib_detect_death(fi, order, &last_resort, | |
971b893e | 1852 | &last_idx, tb->tb_default)) { |
a2bbe682 | 1853 | fib_result_assign(res, fi); |
971b893e | 1854 | tb->tb_default = order; |
19baf839 RO |
1855 | goto out; |
1856 | } | |
1857 | fi = next_fi; | |
1858 | order++; | |
1859 | } | |
1860 | if (order <= 0 || fi == NULL) { | |
971b893e | 1861 | tb->tb_default = -1; |
19baf839 RO |
1862 | goto out; |
1863 | } | |
1864 | ||
971b893e DL |
1865 | if (!fib_detect_death(fi, order, &last_resort, &last_idx, |
1866 | tb->tb_default)) { | |
a2bbe682 | 1867 | fib_result_assign(res, fi); |
971b893e | 1868 | tb->tb_default = order; |
19baf839 RO |
1869 | goto out; |
1870 | } | |
a2bbe682 DL |
1871 | if (last_idx >= 0) |
1872 | fib_result_assign(res, last_resort); | |
971b893e DL |
1873 | tb->tb_default = last_idx; |
1874 | out: | |
2373ce1c | 1875 | rcu_read_unlock(); |
19baf839 RO |
1876 | } |
1877 | ||
a07f5f50 SH |
1878 | static int fn_trie_dump_fa(t_key key, int plen, struct list_head *fah, |
1879 | struct fib_table *tb, | |
19baf839 RO |
1880 | struct sk_buff *skb, struct netlink_callback *cb) |
1881 | { | |
1882 | int i, s_i; | |
1883 | struct fib_alias *fa; | |
32ab5f80 | 1884 | __be32 xkey = htonl(key); |
19baf839 | 1885 | |
71d67e66 | 1886 | s_i = cb->args[5]; |
19baf839 RO |
1887 | i = 0; |
1888 | ||
2373ce1c RO |
1889 | /* rcu_read_lock is hold by caller */ |
1890 | ||
1891 | list_for_each_entry_rcu(fa, fah, fa_list) { | |
19baf839 RO |
1892 | if (i < s_i) { |
1893 | i++; | |
1894 | continue; | |
1895 | } | |
19baf839 RO |
1896 | |
1897 | if (fib_dump_info(skb, NETLINK_CB(cb->skb).pid, | |
1898 | cb->nlh->nlmsg_seq, | |
1899 | RTM_NEWROUTE, | |
1900 | tb->tb_id, | |
1901 | fa->fa_type, | |
1902 | fa->fa_scope, | |
be403ea1 | 1903 | xkey, |
19baf839 RO |
1904 | plen, |
1905 | fa->fa_tos, | |
64347f78 | 1906 | fa->fa_info, NLM_F_MULTI) < 0) { |
71d67e66 | 1907 | cb->args[5] = i; |
19baf839 | 1908 | return -1; |
91b9a277 | 1909 | } |
19baf839 RO |
1910 | i++; |
1911 | } | |
71d67e66 | 1912 | cb->args[5] = i; |
19baf839 RO |
1913 | return skb->len; |
1914 | } | |
1915 | ||
a88ee229 SH |
1916 | static int fn_trie_dump_leaf(struct leaf *l, struct fib_table *tb, |
1917 | struct sk_buff *skb, struct netlink_callback *cb) | |
19baf839 | 1918 | { |
a88ee229 SH |
1919 | struct leaf_info *li; |
1920 | struct hlist_node *node; | |
1921 | int i, s_i; | |
19baf839 | 1922 | |
71d67e66 | 1923 | s_i = cb->args[4]; |
a88ee229 | 1924 | i = 0; |
19baf839 | 1925 | |
a88ee229 SH |
1926 | /* rcu_read_lock is hold by caller */ |
1927 | hlist_for_each_entry_rcu(li, node, &l->list, hlist) { | |
1928 | if (i < s_i) { | |
1929 | i++; | |
19baf839 | 1930 | continue; |
a88ee229 | 1931 | } |
91b9a277 | 1932 | |
a88ee229 | 1933 | if (i > s_i) |
71d67e66 | 1934 | cb->args[5] = 0; |
19baf839 | 1935 | |
a88ee229 | 1936 | if (list_empty(&li->falh)) |
19baf839 RO |
1937 | continue; |
1938 | ||
a88ee229 | 1939 | if (fn_trie_dump_fa(l->key, li->plen, &li->falh, tb, skb, cb) < 0) { |
71d67e66 | 1940 | cb->args[4] = i; |
19baf839 RO |
1941 | return -1; |
1942 | } | |
a88ee229 | 1943 | i++; |
19baf839 | 1944 | } |
a88ee229 | 1945 | |
71d67e66 | 1946 | cb->args[4] = i; |
19baf839 RO |
1947 | return skb->len; |
1948 | } | |
1949 | ||
a07f5f50 SH |
1950 | static int fn_trie_dump(struct fib_table *tb, struct sk_buff *skb, |
1951 | struct netlink_callback *cb) | |
19baf839 | 1952 | { |
a88ee229 | 1953 | struct leaf *l; |
19baf839 | 1954 | struct trie *t = (struct trie *) tb->tb_data; |
d5ce8a0e | 1955 | t_key key = cb->args[2]; |
71d67e66 | 1956 | int count = cb->args[3]; |
19baf839 | 1957 | |
2373ce1c | 1958 | rcu_read_lock(); |
d5ce8a0e SH |
1959 | /* Dump starting at last key. |
1960 | * Note: 0.0.0.0/0 (ie default) is first key. | |
1961 | */ | |
71d67e66 | 1962 | if (count == 0) |
d5ce8a0e SH |
1963 | l = trie_firstleaf(t); |
1964 | else { | |
71d67e66 SH |
1965 | /* Normally, continue from last key, but if that is missing |
1966 | * fallback to using slow rescan | |
1967 | */ | |
d5ce8a0e | 1968 | l = fib_find_node(t, key); |
71d67e66 SH |
1969 | if (!l) |
1970 | l = trie_leafindex(t, count); | |
d5ce8a0e | 1971 | } |
a88ee229 | 1972 | |
d5ce8a0e SH |
1973 | while (l) { |
1974 | cb->args[2] = l->key; | |
a88ee229 | 1975 | if (fn_trie_dump_leaf(l, tb, skb, cb) < 0) { |
71d67e66 | 1976 | cb->args[3] = count; |
a88ee229 | 1977 | rcu_read_unlock(); |
a88ee229 | 1978 | return -1; |
19baf839 | 1979 | } |
d5ce8a0e | 1980 | |
71d67e66 | 1981 | ++count; |
d5ce8a0e | 1982 | l = trie_nextleaf(l); |
71d67e66 SH |
1983 | memset(&cb->args[4], 0, |
1984 | sizeof(cb->args) - 4*sizeof(cb->args[0])); | |
19baf839 | 1985 | } |
71d67e66 | 1986 | cb->args[3] = count; |
2373ce1c | 1987 | rcu_read_unlock(); |
a88ee229 | 1988 | |
19baf839 | 1989 | return skb->len; |
19baf839 RO |
1990 | } |
1991 | ||
7f9b8052 SH |
1992 | void __init fib_hash_init(void) |
1993 | { | |
a07f5f50 SH |
1994 | fn_alias_kmem = kmem_cache_create("ip_fib_alias", |
1995 | sizeof(struct fib_alias), | |
bc3c8c1e SH |
1996 | 0, SLAB_PANIC, NULL); |
1997 | ||
1998 | trie_leaf_kmem = kmem_cache_create("ip_fib_trie", | |
1999 | max(sizeof(struct leaf), | |
2000 | sizeof(struct leaf_info)), | |
2001 | 0, SLAB_PANIC, NULL); | |
7f9b8052 | 2002 | } |
19baf839 | 2003 | |
7f9b8052 SH |
2004 | |
2005 | /* Fix more generic FIB names for init later */ | |
2006 | struct fib_table *fib_hash_table(u32 id) | |
19baf839 RO |
2007 | { |
2008 | struct fib_table *tb; | |
2009 | struct trie *t; | |
2010 | ||
19baf839 RO |
2011 | tb = kmalloc(sizeof(struct fib_table) + sizeof(struct trie), |
2012 | GFP_KERNEL); | |
2013 | if (tb == NULL) | |
2014 | return NULL; | |
2015 | ||
2016 | tb->tb_id = id; | |
971b893e | 2017 | tb->tb_default = -1; |
19baf839 RO |
2018 | tb->tb_lookup = fn_trie_lookup; |
2019 | tb->tb_insert = fn_trie_insert; | |
2020 | tb->tb_delete = fn_trie_delete; | |
2021 | tb->tb_flush = fn_trie_flush; | |
2022 | tb->tb_select_default = fn_trie_select_default; | |
2023 | tb->tb_dump = fn_trie_dump; | |
19baf839 RO |
2024 | |
2025 | t = (struct trie *) tb->tb_data; | |
c28a1cf4 | 2026 | memset(t, 0, sizeof(*t)); |
19baf839 | 2027 | |
19baf839 | 2028 | if (id == RT_TABLE_LOCAL) |
a07f5f50 | 2029 | pr_info("IPv4 FIB: Using LC-trie version %s\n", VERSION); |
19baf839 RO |
2030 | |
2031 | return tb; | |
2032 | } | |
2033 | ||
cb7b593c SH |
2034 | #ifdef CONFIG_PROC_FS |
2035 | /* Depth first Trie walk iterator */ | |
2036 | struct fib_trie_iter { | |
1c340b2f | 2037 | struct seq_net_private p; |
3d3b2d25 | 2038 | struct fib_table *tb; |
cb7b593c | 2039 | struct tnode *tnode; |
cb7b593c SH |
2040 | unsigned index; |
2041 | unsigned depth; | |
2042 | }; | |
19baf839 | 2043 | |
cb7b593c | 2044 | static struct node *fib_trie_get_next(struct fib_trie_iter *iter) |
19baf839 | 2045 | { |
cb7b593c SH |
2046 | struct tnode *tn = iter->tnode; |
2047 | unsigned cindex = iter->index; | |
2048 | struct tnode *p; | |
19baf839 | 2049 | |
6640e697 EB |
2050 | /* A single entry routing table */ |
2051 | if (!tn) | |
2052 | return NULL; | |
2053 | ||
cb7b593c SH |
2054 | pr_debug("get_next iter={node=%p index=%d depth=%d}\n", |
2055 | iter->tnode, iter->index, iter->depth); | |
2056 | rescan: | |
2057 | while (cindex < (1<<tn->bits)) { | |
b59cfbf7 | 2058 | struct node *n = tnode_get_child_rcu(tn, cindex); |
19baf839 | 2059 | |
cb7b593c SH |
2060 | if (n) { |
2061 | if (IS_LEAF(n)) { | |
2062 | iter->tnode = tn; | |
2063 | iter->index = cindex + 1; | |
2064 | } else { | |
2065 | /* push down one level */ | |
2066 | iter->tnode = (struct tnode *) n; | |
2067 | iter->index = 0; | |
2068 | ++iter->depth; | |
2069 | } | |
2070 | return n; | |
2071 | } | |
19baf839 | 2072 | |
cb7b593c SH |
2073 | ++cindex; |
2074 | } | |
91b9a277 | 2075 | |
cb7b593c | 2076 | /* Current node exhausted, pop back up */ |
b59cfbf7 | 2077 | p = node_parent_rcu((struct node *)tn); |
cb7b593c SH |
2078 | if (p) { |
2079 | cindex = tkey_extract_bits(tn->key, p->pos, p->bits)+1; | |
2080 | tn = p; | |
2081 | --iter->depth; | |
2082 | goto rescan; | |
19baf839 | 2083 | } |
cb7b593c SH |
2084 | |
2085 | /* got root? */ | |
2086 | return NULL; | |
19baf839 RO |
2087 | } |
2088 | ||
cb7b593c SH |
2089 | static struct node *fib_trie_get_first(struct fib_trie_iter *iter, |
2090 | struct trie *t) | |
19baf839 | 2091 | { |
3d3b2d25 | 2092 | struct node *n; |
5ddf0eb2 | 2093 | |
132adf54 | 2094 | if (!t) |
5ddf0eb2 RO |
2095 | return NULL; |
2096 | ||
2097 | n = rcu_dereference(t->trie); | |
3d3b2d25 | 2098 | if (!n) |
5ddf0eb2 | 2099 | return NULL; |
19baf839 | 2100 | |
3d3b2d25 SH |
2101 | if (IS_TNODE(n)) { |
2102 | iter->tnode = (struct tnode *) n; | |
2103 | iter->index = 0; | |
2104 | iter->depth = 1; | |
2105 | } else { | |
2106 | iter->tnode = NULL; | |
2107 | iter->index = 0; | |
2108 | iter->depth = 0; | |
91b9a277 | 2109 | } |
3d3b2d25 SH |
2110 | |
2111 | return n; | |
cb7b593c | 2112 | } |
91b9a277 | 2113 | |
cb7b593c SH |
2114 | static void trie_collect_stats(struct trie *t, struct trie_stat *s) |
2115 | { | |
2116 | struct node *n; | |
2117 | struct fib_trie_iter iter; | |
91b9a277 | 2118 | |
cb7b593c | 2119 | memset(s, 0, sizeof(*s)); |
91b9a277 | 2120 | |
cb7b593c | 2121 | rcu_read_lock(); |
3d3b2d25 | 2122 | for (n = fib_trie_get_first(&iter, t); n; n = fib_trie_get_next(&iter)) { |
cb7b593c | 2123 | if (IS_LEAF(n)) { |
93672292 SH |
2124 | struct leaf *l = (struct leaf *)n; |
2125 | struct leaf_info *li; | |
2126 | struct hlist_node *tmp; | |
2127 | ||
cb7b593c SH |
2128 | s->leaves++; |
2129 | s->totdepth += iter.depth; | |
2130 | if (iter.depth > s->maxdepth) | |
2131 | s->maxdepth = iter.depth; | |
93672292 SH |
2132 | |
2133 | hlist_for_each_entry_rcu(li, tmp, &l->list, hlist) | |
2134 | ++s->prefixes; | |
cb7b593c SH |
2135 | } else { |
2136 | const struct tnode *tn = (const struct tnode *) n; | |
2137 | int i; | |
2138 | ||
2139 | s->tnodes++; | |
132adf54 | 2140 | if (tn->bits < MAX_STAT_DEPTH) |
06ef921d RO |
2141 | s->nodesizes[tn->bits]++; |
2142 | ||
cb7b593c SH |
2143 | for (i = 0; i < (1<<tn->bits); i++) |
2144 | if (!tn->child[i]) | |
2145 | s->nullpointers++; | |
19baf839 | 2146 | } |
19baf839 | 2147 | } |
2373ce1c | 2148 | rcu_read_unlock(); |
19baf839 RO |
2149 | } |
2150 | ||
cb7b593c SH |
2151 | /* |
2152 | * This outputs /proc/net/fib_triestats | |
2153 | */ | |
2154 | static void trie_show_stats(struct seq_file *seq, struct trie_stat *stat) | |
19baf839 | 2155 | { |
cb7b593c | 2156 | unsigned i, max, pointers, bytes, avdepth; |
c877efb2 | 2157 | |
cb7b593c SH |
2158 | if (stat->leaves) |
2159 | avdepth = stat->totdepth*100 / stat->leaves; | |
2160 | else | |
2161 | avdepth = 0; | |
91b9a277 | 2162 | |
a07f5f50 SH |
2163 | seq_printf(seq, "\tAver depth: %u.%02d\n", |
2164 | avdepth / 100, avdepth % 100); | |
cb7b593c | 2165 | seq_printf(seq, "\tMax depth: %u\n", stat->maxdepth); |
91b9a277 | 2166 | |
cb7b593c | 2167 | seq_printf(seq, "\tLeaves: %u\n", stat->leaves); |
cb7b593c | 2168 | bytes = sizeof(struct leaf) * stat->leaves; |
93672292 SH |
2169 | |
2170 | seq_printf(seq, "\tPrefixes: %u\n", stat->prefixes); | |
2171 | bytes += sizeof(struct leaf_info) * stat->prefixes; | |
2172 | ||
187b5188 | 2173 | seq_printf(seq, "\tInternal nodes: %u\n\t", stat->tnodes); |
cb7b593c | 2174 | bytes += sizeof(struct tnode) * stat->tnodes; |
19baf839 | 2175 | |
06ef921d RO |
2176 | max = MAX_STAT_DEPTH; |
2177 | while (max > 0 && stat->nodesizes[max-1] == 0) | |
cb7b593c | 2178 | max--; |
19baf839 | 2179 | |
cb7b593c SH |
2180 | pointers = 0; |
2181 | for (i = 1; i <= max; i++) | |
2182 | if (stat->nodesizes[i] != 0) { | |
187b5188 | 2183 | seq_printf(seq, " %u: %u", i, stat->nodesizes[i]); |
cb7b593c SH |
2184 | pointers += (1<<i) * stat->nodesizes[i]; |
2185 | } | |
2186 | seq_putc(seq, '\n'); | |
187b5188 | 2187 | seq_printf(seq, "\tPointers: %u\n", pointers); |
2373ce1c | 2188 | |
cb7b593c | 2189 | bytes += sizeof(struct node *) * pointers; |
187b5188 SH |
2190 | seq_printf(seq, "Null ptrs: %u\n", stat->nullpointers); |
2191 | seq_printf(seq, "Total size: %u kB\n", (bytes + 1023) / 1024); | |
66a2f7fd | 2192 | } |
2373ce1c | 2193 | |
cb7b593c | 2194 | #ifdef CONFIG_IP_FIB_TRIE_STATS |
66a2f7fd SH |
2195 | static void trie_show_usage(struct seq_file *seq, |
2196 | const struct trie_use_stats *stats) | |
2197 | { | |
2198 | seq_printf(seq, "\nCounters:\n---------\n"); | |
a07f5f50 SH |
2199 | seq_printf(seq, "gets = %u\n", stats->gets); |
2200 | seq_printf(seq, "backtracks = %u\n", stats->backtrack); | |
2201 | seq_printf(seq, "semantic match passed = %u\n", | |
2202 | stats->semantic_match_passed); | |
2203 | seq_printf(seq, "semantic match miss = %u\n", | |
2204 | stats->semantic_match_miss); | |
2205 | seq_printf(seq, "null node hit= %u\n", stats->null_node_hit); | |
2206 | seq_printf(seq, "skipped node resize = %u\n\n", | |
2207 | stats->resize_node_skipped); | |
cb7b593c | 2208 | } |
66a2f7fd SH |
2209 | #endif /* CONFIG_IP_FIB_TRIE_STATS */ |
2210 | ||
3d3b2d25 | 2211 | static void fib_table_print(struct seq_file *seq, struct fib_table *tb) |
d717a9a6 | 2212 | { |
3d3b2d25 SH |
2213 | if (tb->tb_id == RT_TABLE_LOCAL) |
2214 | seq_puts(seq, "Local:\n"); | |
2215 | else if (tb->tb_id == RT_TABLE_MAIN) | |
2216 | seq_puts(seq, "Main:\n"); | |
2217 | else | |
2218 | seq_printf(seq, "Id %d:\n", tb->tb_id); | |
d717a9a6 | 2219 | } |
19baf839 | 2220 | |
3d3b2d25 | 2221 | |
cb7b593c SH |
2222 | static int fib_triestat_seq_show(struct seq_file *seq, void *v) |
2223 | { | |
1c340b2f | 2224 | struct net *net = (struct net *)seq->private; |
3d3b2d25 | 2225 | unsigned int h; |
877a9bff | 2226 | |
d717a9a6 | 2227 | seq_printf(seq, |
a07f5f50 SH |
2228 | "Basic info: size of leaf:" |
2229 | " %Zd bytes, size of tnode: %Zd bytes.\n", | |
d717a9a6 SH |
2230 | sizeof(struct leaf), sizeof(struct tnode)); |
2231 | ||
3d3b2d25 SH |
2232 | for (h = 0; h < FIB_TABLE_HASHSZ; h++) { |
2233 | struct hlist_head *head = &net->ipv4.fib_table_hash[h]; | |
2234 | struct hlist_node *node; | |
2235 | struct fib_table *tb; | |
2236 | ||
2237 | hlist_for_each_entry_rcu(tb, node, head, tb_hlist) { | |
2238 | struct trie *t = (struct trie *) tb->tb_data; | |
2239 | struct trie_stat stat; | |
877a9bff | 2240 | |
3d3b2d25 SH |
2241 | if (!t) |
2242 | continue; | |
2243 | ||
2244 | fib_table_print(seq, tb); | |
2245 | ||
2246 | trie_collect_stats(t, &stat); | |
2247 | trie_show_stats(seq, &stat); | |
2248 | #ifdef CONFIG_IP_FIB_TRIE_STATS | |
2249 | trie_show_usage(seq, &t->stats); | |
2250 | #endif | |
2251 | } | |
2252 | } | |
19baf839 | 2253 | |
cb7b593c | 2254 | return 0; |
19baf839 RO |
2255 | } |
2256 | ||
cb7b593c | 2257 | static int fib_triestat_seq_open(struct inode *inode, struct file *file) |
19baf839 | 2258 | { |
1c340b2f DL |
2259 | int err; |
2260 | struct net *net; | |
2261 | ||
2262 | net = get_proc_net(inode); | |
2263 | if (net == NULL) | |
2264 | return -ENXIO; | |
2265 | err = single_open(file, fib_triestat_seq_show, net); | |
2266 | if (err < 0) { | |
2267 | put_net(net); | |
2268 | return err; | |
2269 | } | |
2270 | return 0; | |
2271 | } | |
2272 | ||
2273 | static int fib_triestat_seq_release(struct inode *ino, struct file *f) | |
2274 | { | |
2275 | struct seq_file *seq = f->private_data; | |
2276 | put_net(seq->private); | |
2277 | return single_release(ino, f); | |
19baf839 RO |
2278 | } |
2279 | ||
9a32144e | 2280 | static const struct file_operations fib_triestat_fops = { |
cb7b593c SH |
2281 | .owner = THIS_MODULE, |
2282 | .open = fib_triestat_seq_open, | |
2283 | .read = seq_read, | |
2284 | .llseek = seq_lseek, | |
1c340b2f | 2285 | .release = fib_triestat_seq_release, |
cb7b593c SH |
2286 | }; |
2287 | ||
1218854a | 2288 | static struct node *fib_trie_get_idx(struct seq_file *seq, loff_t pos) |
19baf839 | 2289 | { |
1218854a YH |
2290 | struct fib_trie_iter *iter = seq->private; |
2291 | struct net *net = seq_file_net(seq); | |
cb7b593c | 2292 | loff_t idx = 0; |
3d3b2d25 | 2293 | unsigned int h; |
cb7b593c | 2294 | |
3d3b2d25 SH |
2295 | for (h = 0; h < FIB_TABLE_HASHSZ; h++) { |
2296 | struct hlist_head *head = &net->ipv4.fib_table_hash[h]; | |
2297 | struct hlist_node *node; | |
2298 | struct fib_table *tb; | |
cb7b593c | 2299 | |
3d3b2d25 SH |
2300 | hlist_for_each_entry_rcu(tb, node, head, tb_hlist) { |
2301 | struct node *n; | |
2302 | ||
2303 | for (n = fib_trie_get_first(iter, | |
2304 | (struct trie *) tb->tb_data); | |
2305 | n; n = fib_trie_get_next(iter)) | |
2306 | if (pos == idx++) { | |
2307 | iter->tb = tb; | |
2308 | return n; | |
2309 | } | |
2310 | } | |
cb7b593c | 2311 | } |
3d3b2d25 | 2312 | |
19baf839 RO |
2313 | return NULL; |
2314 | } | |
2315 | ||
cb7b593c | 2316 | static void *fib_trie_seq_start(struct seq_file *seq, loff_t *pos) |
c95aaf9a | 2317 | __acquires(RCU) |
19baf839 | 2318 | { |
cb7b593c | 2319 | rcu_read_lock(); |
1218854a | 2320 | return fib_trie_get_idx(seq, *pos); |
19baf839 RO |
2321 | } |
2322 | ||
cb7b593c | 2323 | static void *fib_trie_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
19baf839 | 2324 | { |
cb7b593c | 2325 | struct fib_trie_iter *iter = seq->private; |
1218854a | 2326 | struct net *net = seq_file_net(seq); |
3d3b2d25 SH |
2327 | struct fib_table *tb = iter->tb; |
2328 | struct hlist_node *tb_node; | |
2329 | unsigned int h; | |
2330 | struct node *n; | |
cb7b593c | 2331 | |
19baf839 | 2332 | ++*pos; |
3d3b2d25 SH |
2333 | /* next node in same table */ |
2334 | n = fib_trie_get_next(iter); | |
2335 | if (n) | |
2336 | return n; | |
19baf839 | 2337 | |
3d3b2d25 SH |
2338 | /* walk rest of this hash chain */ |
2339 | h = tb->tb_id & (FIB_TABLE_HASHSZ - 1); | |
2340 | while ( (tb_node = rcu_dereference(tb->tb_hlist.next)) ) { | |
2341 | tb = hlist_entry(tb_node, struct fib_table, tb_hlist); | |
2342 | n = fib_trie_get_first(iter, (struct trie *) tb->tb_data); | |
2343 | if (n) | |
2344 | goto found; | |
2345 | } | |
19baf839 | 2346 | |
3d3b2d25 SH |
2347 | /* new hash chain */ |
2348 | while (++h < FIB_TABLE_HASHSZ) { | |
2349 | struct hlist_head *head = &net->ipv4.fib_table_hash[h]; | |
2350 | hlist_for_each_entry_rcu(tb, tb_node, head, tb_hlist) { | |
2351 | n = fib_trie_get_first(iter, (struct trie *) tb->tb_data); | |
2352 | if (n) | |
2353 | goto found; | |
2354 | } | |
2355 | } | |
cb7b593c | 2356 | return NULL; |
3d3b2d25 SH |
2357 | |
2358 | found: | |
2359 | iter->tb = tb; | |
2360 | return n; | |
cb7b593c | 2361 | } |
19baf839 | 2362 | |
cb7b593c | 2363 | static void fib_trie_seq_stop(struct seq_file *seq, void *v) |
c95aaf9a | 2364 | __releases(RCU) |
19baf839 | 2365 | { |
cb7b593c SH |
2366 | rcu_read_unlock(); |
2367 | } | |
91b9a277 | 2368 | |
cb7b593c SH |
2369 | static void seq_indent(struct seq_file *seq, int n) |
2370 | { | |
2371 | while (n-- > 0) seq_puts(seq, " "); | |
2372 | } | |
19baf839 | 2373 | |
28d36e37 | 2374 | static inline const char *rtn_scope(char *buf, size_t len, enum rt_scope_t s) |
cb7b593c | 2375 | { |
132adf54 | 2376 | switch (s) { |
cb7b593c SH |
2377 | case RT_SCOPE_UNIVERSE: return "universe"; |
2378 | case RT_SCOPE_SITE: return "site"; | |
2379 | case RT_SCOPE_LINK: return "link"; | |
2380 | case RT_SCOPE_HOST: return "host"; | |
2381 | case RT_SCOPE_NOWHERE: return "nowhere"; | |
2382 | default: | |
28d36e37 | 2383 | snprintf(buf, len, "scope=%d", s); |
cb7b593c SH |
2384 | return buf; |
2385 | } | |
2386 | } | |
19baf839 | 2387 | |
cb7b593c SH |
2388 | static const char *rtn_type_names[__RTN_MAX] = { |
2389 | [RTN_UNSPEC] = "UNSPEC", | |
2390 | [RTN_UNICAST] = "UNICAST", | |
2391 | [RTN_LOCAL] = "LOCAL", | |
2392 | [RTN_BROADCAST] = "BROADCAST", | |
2393 | [RTN_ANYCAST] = "ANYCAST", | |
2394 | [RTN_MULTICAST] = "MULTICAST", | |
2395 | [RTN_BLACKHOLE] = "BLACKHOLE", | |
2396 | [RTN_UNREACHABLE] = "UNREACHABLE", | |
2397 | [RTN_PROHIBIT] = "PROHIBIT", | |
2398 | [RTN_THROW] = "THROW", | |
2399 | [RTN_NAT] = "NAT", | |
2400 | [RTN_XRESOLVE] = "XRESOLVE", | |
2401 | }; | |
19baf839 | 2402 | |
28d36e37 | 2403 | static inline const char *rtn_type(char *buf, size_t len, unsigned t) |
cb7b593c | 2404 | { |
cb7b593c SH |
2405 | if (t < __RTN_MAX && rtn_type_names[t]) |
2406 | return rtn_type_names[t]; | |
28d36e37 | 2407 | snprintf(buf, len, "type %u", t); |
cb7b593c | 2408 | return buf; |
19baf839 RO |
2409 | } |
2410 | ||
cb7b593c SH |
2411 | /* Pretty print the trie */ |
2412 | static int fib_trie_seq_show(struct seq_file *seq, void *v) | |
19baf839 | 2413 | { |
cb7b593c SH |
2414 | const struct fib_trie_iter *iter = seq->private; |
2415 | struct node *n = v; | |
c877efb2 | 2416 | |
3d3b2d25 SH |
2417 | if (!node_parent_rcu(n)) |
2418 | fib_table_print(seq, iter->tb); | |
095b8501 | 2419 | |
cb7b593c SH |
2420 | if (IS_TNODE(n)) { |
2421 | struct tnode *tn = (struct tnode *) n; | |
ab66b4a7 | 2422 | __be32 prf = htonl(mask_pfx(tn->key, tn->pos)); |
91b9a277 | 2423 | |
1d25cd6c | 2424 | seq_indent(seq, iter->depth-1); |
a7d632b6 | 2425 | seq_printf(seq, " +-- " NIPQUAD_FMT "/%d %d %d %d\n", |
e905a9ed | 2426 | NIPQUAD(prf), tn->pos, tn->bits, tn->full_children, |
1d25cd6c | 2427 | tn->empty_children); |
e905a9ed | 2428 | |
cb7b593c SH |
2429 | } else { |
2430 | struct leaf *l = (struct leaf *) n; | |
1328042e SH |
2431 | struct leaf_info *li; |
2432 | struct hlist_node *node; | |
32ab5f80 | 2433 | __be32 val = htonl(l->key); |
cb7b593c SH |
2434 | |
2435 | seq_indent(seq, iter->depth); | |
a7d632b6 | 2436 | seq_printf(seq, " |-- " NIPQUAD_FMT "\n", NIPQUAD(val)); |
1328042e SH |
2437 | |
2438 | hlist_for_each_entry_rcu(li, node, &l->list, hlist) { | |
2439 | struct fib_alias *fa; | |
2440 | ||
2441 | list_for_each_entry_rcu(fa, &li->falh, fa_list) { | |
2442 | char buf1[32], buf2[32]; | |
2443 | ||
2444 | seq_indent(seq, iter->depth+1); | |
2445 | seq_printf(seq, " /%d %s %s", li->plen, | |
2446 | rtn_scope(buf1, sizeof(buf1), | |
2447 | fa->fa_scope), | |
2448 | rtn_type(buf2, sizeof(buf2), | |
2449 | fa->fa_type)); | |
2450 | if (fa->fa_tos) | |
b9c4d82a | 2451 | seq_printf(seq, " tos=%d", fa->fa_tos); |
1328042e | 2452 | seq_putc(seq, '\n'); |
cb7b593c SH |
2453 | } |
2454 | } | |
19baf839 | 2455 | } |
cb7b593c | 2456 | |
19baf839 RO |
2457 | return 0; |
2458 | } | |
2459 | ||
f690808e | 2460 | static const struct seq_operations fib_trie_seq_ops = { |
cb7b593c SH |
2461 | .start = fib_trie_seq_start, |
2462 | .next = fib_trie_seq_next, | |
2463 | .stop = fib_trie_seq_stop, | |
2464 | .show = fib_trie_seq_show, | |
19baf839 RO |
2465 | }; |
2466 | ||
cb7b593c | 2467 | static int fib_trie_seq_open(struct inode *inode, struct file *file) |
19baf839 | 2468 | { |
1c340b2f DL |
2469 | return seq_open_net(inode, file, &fib_trie_seq_ops, |
2470 | sizeof(struct fib_trie_iter)); | |
19baf839 RO |
2471 | } |
2472 | ||
9a32144e | 2473 | static const struct file_operations fib_trie_fops = { |
cb7b593c SH |
2474 | .owner = THIS_MODULE, |
2475 | .open = fib_trie_seq_open, | |
2476 | .read = seq_read, | |
2477 | .llseek = seq_lseek, | |
1c340b2f | 2478 | .release = seq_release_net, |
19baf839 RO |
2479 | }; |
2480 | ||
8315f5d8 SH |
2481 | struct fib_route_iter { |
2482 | struct seq_net_private p; | |
2483 | struct trie *main_trie; | |
2484 | loff_t pos; | |
2485 | t_key key; | |
2486 | }; | |
2487 | ||
2488 | static struct leaf *fib_route_get_idx(struct fib_route_iter *iter, loff_t pos) | |
2489 | { | |
2490 | struct leaf *l = NULL; | |
2491 | struct trie *t = iter->main_trie; | |
2492 | ||
2493 | /* use cache location of last found key */ | |
2494 | if (iter->pos > 0 && pos >= iter->pos && (l = fib_find_node(t, iter->key))) | |
2495 | pos -= iter->pos; | |
2496 | else { | |
2497 | iter->pos = 0; | |
2498 | l = trie_firstleaf(t); | |
2499 | } | |
2500 | ||
2501 | while (l && pos-- > 0) { | |
2502 | iter->pos++; | |
2503 | l = trie_nextleaf(l); | |
2504 | } | |
2505 | ||
2506 | if (l) | |
2507 | iter->key = pos; /* remember it */ | |
2508 | else | |
2509 | iter->pos = 0; /* forget it */ | |
2510 | ||
2511 | return l; | |
2512 | } | |
2513 | ||
2514 | static void *fib_route_seq_start(struct seq_file *seq, loff_t *pos) | |
2515 | __acquires(RCU) | |
2516 | { | |
2517 | struct fib_route_iter *iter = seq->private; | |
2518 | struct fib_table *tb; | |
2519 | ||
2520 | rcu_read_lock(); | |
1218854a | 2521 | tb = fib_get_table(seq_file_net(seq), RT_TABLE_MAIN); |
8315f5d8 SH |
2522 | if (!tb) |
2523 | return NULL; | |
2524 | ||
2525 | iter->main_trie = (struct trie *) tb->tb_data; | |
2526 | if (*pos == 0) | |
2527 | return SEQ_START_TOKEN; | |
2528 | else | |
2529 | return fib_route_get_idx(iter, *pos - 1); | |
2530 | } | |
2531 | ||
2532 | static void *fib_route_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2533 | { | |
2534 | struct fib_route_iter *iter = seq->private; | |
2535 | struct leaf *l = v; | |
2536 | ||
2537 | ++*pos; | |
2538 | if (v == SEQ_START_TOKEN) { | |
2539 | iter->pos = 0; | |
2540 | l = trie_firstleaf(iter->main_trie); | |
2541 | } else { | |
2542 | iter->pos++; | |
2543 | l = trie_nextleaf(l); | |
2544 | } | |
2545 | ||
2546 | if (l) | |
2547 | iter->key = l->key; | |
2548 | else | |
2549 | iter->pos = 0; | |
2550 | return l; | |
2551 | } | |
2552 | ||
2553 | static void fib_route_seq_stop(struct seq_file *seq, void *v) | |
2554 | __releases(RCU) | |
2555 | { | |
2556 | rcu_read_unlock(); | |
2557 | } | |
2558 | ||
32ab5f80 | 2559 | static unsigned fib_flag_trans(int type, __be32 mask, const struct fib_info *fi) |
19baf839 | 2560 | { |
cb7b593c SH |
2561 | static unsigned type2flags[RTN_MAX + 1] = { |
2562 | [7] = RTF_REJECT, [8] = RTF_REJECT, | |
2563 | }; | |
2564 | unsigned flags = type2flags[type]; | |
19baf839 | 2565 | |
cb7b593c SH |
2566 | if (fi && fi->fib_nh->nh_gw) |
2567 | flags |= RTF_GATEWAY; | |
32ab5f80 | 2568 | if (mask == htonl(0xFFFFFFFF)) |
cb7b593c SH |
2569 | flags |= RTF_HOST; |
2570 | flags |= RTF_UP; | |
2571 | return flags; | |
19baf839 RO |
2572 | } |
2573 | ||
cb7b593c SH |
2574 | /* |
2575 | * This outputs /proc/net/route. | |
2576 | * The format of the file is not supposed to be changed | |
2577 | * and needs to be same as fib_hash output to avoid breaking | |
2578 | * legacy utilities | |
2579 | */ | |
2580 | static int fib_route_seq_show(struct seq_file *seq, void *v) | |
19baf839 | 2581 | { |
cb7b593c | 2582 | struct leaf *l = v; |
1328042e SH |
2583 | struct leaf_info *li; |
2584 | struct hlist_node *node; | |
19baf839 | 2585 | |
cb7b593c SH |
2586 | if (v == SEQ_START_TOKEN) { |
2587 | seq_printf(seq, "%-127s\n", "Iface\tDestination\tGateway " | |
2588 | "\tFlags\tRefCnt\tUse\tMetric\tMask\t\tMTU" | |
2589 | "\tWindow\tIRTT"); | |
2590 | return 0; | |
2591 | } | |
19baf839 | 2592 | |
1328042e | 2593 | hlist_for_each_entry_rcu(li, node, &l->list, hlist) { |
cb7b593c | 2594 | struct fib_alias *fa; |
32ab5f80 | 2595 | __be32 mask, prefix; |
91b9a277 | 2596 | |
cb7b593c SH |
2597 | mask = inet_make_mask(li->plen); |
2598 | prefix = htonl(l->key); | |
19baf839 | 2599 | |
cb7b593c | 2600 | list_for_each_entry_rcu(fa, &li->falh, fa_list) { |
1371e37d | 2601 | const struct fib_info *fi = fa->fa_info; |
cb7b593c | 2602 | unsigned flags = fib_flag_trans(fa->fa_type, mask, fi); |
5e659e4c | 2603 | int len; |
19baf839 | 2604 | |
cb7b593c SH |
2605 | if (fa->fa_type == RTN_BROADCAST |
2606 | || fa->fa_type == RTN_MULTICAST) | |
2607 | continue; | |
19baf839 | 2608 | |
cb7b593c | 2609 | if (fi) |
5e659e4c PE |
2610 | seq_printf(seq, |
2611 | "%s\t%08X\t%08X\t%04X\t%d\t%u\t" | |
2612 | "%d\t%08X\t%d\t%u\t%u%n", | |
cb7b593c SH |
2613 | fi->fib_dev ? fi->fib_dev->name : "*", |
2614 | prefix, | |
2615 | fi->fib_nh->nh_gw, flags, 0, 0, | |
2616 | fi->fib_priority, | |
2617 | mask, | |
a07f5f50 SH |
2618 | (fi->fib_advmss ? |
2619 | fi->fib_advmss + 40 : 0), | |
cb7b593c | 2620 | fi->fib_window, |
5e659e4c | 2621 | fi->fib_rtt >> 3, &len); |
cb7b593c | 2622 | else |
5e659e4c PE |
2623 | seq_printf(seq, |
2624 | "*\t%08X\t%08X\t%04X\t%d\t%u\t" | |
2625 | "%d\t%08X\t%d\t%u\t%u%n", | |
cb7b593c | 2626 | prefix, 0, flags, 0, 0, 0, |
5e659e4c | 2627 | mask, 0, 0, 0, &len); |
19baf839 | 2628 | |
5e659e4c | 2629 | seq_printf(seq, "%*s\n", 127 - len, ""); |
cb7b593c | 2630 | } |
19baf839 RO |
2631 | } |
2632 | ||
2633 | return 0; | |
2634 | } | |
2635 | ||
f690808e | 2636 | static const struct seq_operations fib_route_seq_ops = { |
8315f5d8 SH |
2637 | .start = fib_route_seq_start, |
2638 | .next = fib_route_seq_next, | |
2639 | .stop = fib_route_seq_stop, | |
cb7b593c | 2640 | .show = fib_route_seq_show, |
19baf839 RO |
2641 | }; |
2642 | ||
cb7b593c | 2643 | static int fib_route_seq_open(struct inode *inode, struct file *file) |
19baf839 | 2644 | { |
1c340b2f | 2645 | return seq_open_net(inode, file, &fib_route_seq_ops, |
8315f5d8 | 2646 | sizeof(struct fib_route_iter)); |
19baf839 RO |
2647 | } |
2648 | ||
9a32144e | 2649 | static const struct file_operations fib_route_fops = { |
cb7b593c SH |
2650 | .owner = THIS_MODULE, |
2651 | .open = fib_route_seq_open, | |
2652 | .read = seq_read, | |
2653 | .llseek = seq_lseek, | |
1c340b2f | 2654 | .release = seq_release_net, |
19baf839 RO |
2655 | }; |
2656 | ||
61a02653 | 2657 | int __net_init fib_proc_init(struct net *net) |
19baf839 | 2658 | { |
61a02653 | 2659 | if (!proc_net_fops_create(net, "fib_trie", S_IRUGO, &fib_trie_fops)) |
cb7b593c SH |
2660 | goto out1; |
2661 | ||
61a02653 DL |
2662 | if (!proc_net_fops_create(net, "fib_triestat", S_IRUGO, |
2663 | &fib_triestat_fops)) | |
cb7b593c SH |
2664 | goto out2; |
2665 | ||
61a02653 | 2666 | if (!proc_net_fops_create(net, "route", S_IRUGO, &fib_route_fops)) |
cb7b593c SH |
2667 | goto out3; |
2668 | ||
19baf839 | 2669 | return 0; |
cb7b593c SH |
2670 | |
2671 | out3: | |
61a02653 | 2672 | proc_net_remove(net, "fib_triestat"); |
cb7b593c | 2673 | out2: |
61a02653 | 2674 | proc_net_remove(net, "fib_trie"); |
cb7b593c SH |
2675 | out1: |
2676 | return -ENOMEM; | |
19baf839 RO |
2677 | } |
2678 | ||
61a02653 | 2679 | void __net_exit fib_proc_exit(struct net *net) |
19baf839 | 2680 | { |
61a02653 DL |
2681 | proc_net_remove(net, "fib_trie"); |
2682 | proc_net_remove(net, "fib_triestat"); | |
2683 | proc_net_remove(net, "route"); | |
19baf839 RO |
2684 | } |
2685 | ||
2686 | #endif /* CONFIG_PROC_FS */ |