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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 | * | |
25 | * Version: $Id: fib_trie.c,v 1.3 2005/06/08 14:20:01 robert Exp $ | |
26 | * | |
27 | * | |
28 | * Code from fib_hash has been reused which includes the following header: | |
29 | * | |
30 | * | |
31 | * INET An implementation of the TCP/IP protocol suite for the LINUX | |
32 | * operating system. INET is implemented using the BSD Socket | |
33 | * interface as the means of communication with the user level. | |
34 | * | |
35 | * IPv4 FIB: lookup engine and maintenance routines. | |
36 | * | |
37 | * | |
38 | * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> | |
39 | * | |
40 | * This program is free software; you can redistribute it and/or | |
41 | * modify it under the terms of the GNU General Public License | |
42 | * as published by the Free Software Foundation; either version | |
43 | * 2 of the License, or (at your option) any later version. | |
fd966255 RO |
44 | * |
45 | * Substantial contributions to this work comes from: | |
46 | * | |
47 | * David S. Miller, <davem@davemloft.net> | |
48 | * Stephen Hemminger <shemminger@osdl.org> | |
49 | * Paul E. McKenney <paulmck@us.ibm.com> | |
50 | * Patrick McHardy <kaber@trash.net> | |
19baf839 RO |
51 | */ |
52 | ||
05eee48c | 53 | #define VERSION "0.408" |
19baf839 | 54 | |
19baf839 RO |
55 | #include <asm/uaccess.h> |
56 | #include <asm/system.h> | |
1977f032 | 57 | #include <linux/bitops.h> |
19baf839 RO |
58 | #include <linux/types.h> |
59 | #include <linux/kernel.h> | |
19baf839 RO |
60 | #include <linux/mm.h> |
61 | #include <linux/string.h> | |
62 | #include <linux/socket.h> | |
63 | #include <linux/sockios.h> | |
64 | #include <linux/errno.h> | |
65 | #include <linux/in.h> | |
66 | #include <linux/inet.h> | |
cd8787ab | 67 | #include <linux/inetdevice.h> |
19baf839 RO |
68 | #include <linux/netdevice.h> |
69 | #include <linux/if_arp.h> | |
70 | #include <linux/proc_fs.h> | |
2373ce1c | 71 | #include <linux/rcupdate.h> |
19baf839 RO |
72 | #include <linux/skbuff.h> |
73 | #include <linux/netlink.h> | |
74 | #include <linux/init.h> | |
75 | #include <linux/list.h> | |
457c4cbc | 76 | #include <net/net_namespace.h> |
19baf839 RO |
77 | #include <net/ip.h> |
78 | #include <net/protocol.h> | |
79 | #include <net/route.h> | |
80 | #include <net/tcp.h> | |
81 | #include <net/sock.h> | |
82 | #include <net/ip_fib.h> | |
83 | #include "fib_lookup.h" | |
84 | ||
85 | #undef CONFIG_IP_FIB_TRIE_STATS | |
06ef921d | 86 | #define MAX_STAT_DEPTH 32 |
19baf839 | 87 | |
19baf839 | 88 | #define KEYLENGTH (8*sizeof(t_key)) |
19baf839 | 89 | |
19baf839 RO |
90 | typedef unsigned int t_key; |
91 | ||
92 | #define T_TNODE 0 | |
93 | #define T_LEAF 1 | |
94 | #define NODE_TYPE_MASK 0x1UL | |
2373ce1c RO |
95 | #define NODE_TYPE(node) ((node)->parent & NODE_TYPE_MASK) |
96 | ||
91b9a277 OJ |
97 | #define IS_TNODE(n) (!(n->parent & T_LEAF)) |
98 | #define IS_LEAF(n) (n->parent & T_LEAF) | |
19baf839 RO |
99 | |
100 | struct node { | |
91b9a277 OJ |
101 | t_key key; |
102 | unsigned long parent; | |
19baf839 RO |
103 | }; |
104 | ||
105 | struct leaf { | |
91b9a277 OJ |
106 | t_key key; |
107 | unsigned long parent; | |
19baf839 | 108 | struct hlist_head list; |
2373ce1c | 109 | struct rcu_head rcu; |
19baf839 RO |
110 | }; |
111 | ||
112 | struct leaf_info { | |
113 | struct hlist_node hlist; | |
2373ce1c | 114 | struct rcu_head rcu; |
19baf839 RO |
115 | int plen; |
116 | struct list_head falh; | |
117 | }; | |
118 | ||
119 | struct tnode { | |
91b9a277 OJ |
120 | t_key key; |
121 | unsigned long parent; | |
122 | unsigned short pos:5; /* 2log(KEYLENGTH) bits needed */ | |
123 | unsigned short bits:5; /* 2log(KEYLENGTH) bits needed */ | |
124 | unsigned short full_children; /* KEYLENGTH bits needed */ | |
125 | unsigned short empty_children; /* KEYLENGTH bits needed */ | |
2373ce1c | 126 | struct rcu_head rcu; |
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; | |
06ef921d | 147 | unsigned int nodesizes[MAX_STAT_DEPTH]; |
c877efb2 | 148 | }; |
19baf839 RO |
149 | |
150 | struct trie { | |
91b9a277 | 151 | struct node *trie; |
19baf839 RO |
152 | #ifdef CONFIG_IP_FIB_TRIE_STATS |
153 | struct trie_use_stats stats; | |
154 | #endif | |
91b9a277 | 155 | int size; |
19baf839 RO |
156 | unsigned int revision; |
157 | }; | |
158 | ||
19baf839 RO |
159 | static void put_child(struct trie *t, struct tnode *tn, int i, struct node *n); |
160 | static void tnode_put_child_reorg(struct tnode *tn, int i, struct node *n, 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 | static void tnode_free(struct tnode *tn); |
19baf839 | 165 | |
e18b890b | 166 | static struct kmem_cache *fn_alias_kmem __read_mostly; |
19baf839 | 167 | |
06801916 SH |
168 | static inline struct tnode *node_parent(struct node *node) |
169 | { | |
170 | struct tnode *ret; | |
171 | ||
172 | ret = (struct tnode *)(node->parent & ~NODE_TYPE_MASK); | |
173 | return rcu_dereference(ret); | |
174 | } | |
175 | ||
176 | static inline void node_set_parent(struct node *node, struct tnode *ptr) | |
177 | { | |
178 | rcu_assign_pointer(node->parent, | |
179 | (unsigned long)ptr | NODE_TYPE(node)); | |
180 | } | |
2373ce1c RO |
181 | |
182 | /* rcu_read_lock needs to be hold by caller from readside */ | |
183 | ||
c877efb2 | 184 | static inline struct node *tnode_get_child(struct tnode *tn, int i) |
19baf839 | 185 | { |
91b9a277 | 186 | BUG_ON(i >= 1 << tn->bits); |
19baf839 | 187 | |
2373ce1c | 188 | return rcu_dereference(tn->child[i]); |
19baf839 RO |
189 | } |
190 | ||
bb435b8d | 191 | static inline int tnode_child_length(const struct tnode *tn) |
19baf839 | 192 | { |
91b9a277 | 193 | return 1 << tn->bits; |
19baf839 RO |
194 | } |
195 | ||
ab66b4a7 SH |
196 | static inline t_key mask_pfx(t_key k, unsigned short l) |
197 | { | |
198 | return (l == 0) ? 0 : k >> (KEYLENGTH-l) << (KEYLENGTH-l); | |
199 | } | |
200 | ||
19baf839 RO |
201 | static inline t_key tkey_extract_bits(t_key a, int offset, int bits) |
202 | { | |
91b9a277 | 203 | if (offset < KEYLENGTH) |
19baf839 | 204 | return ((t_key)(a << offset)) >> (KEYLENGTH - bits); |
91b9a277 | 205 | else |
19baf839 RO |
206 | return 0; |
207 | } | |
208 | ||
209 | static inline int tkey_equals(t_key a, t_key b) | |
210 | { | |
c877efb2 | 211 | return a == b; |
19baf839 RO |
212 | } |
213 | ||
214 | static inline int tkey_sub_equals(t_key a, int offset, int bits, t_key b) | |
215 | { | |
c877efb2 SH |
216 | if (bits == 0 || offset >= KEYLENGTH) |
217 | return 1; | |
91b9a277 OJ |
218 | bits = bits > KEYLENGTH ? KEYLENGTH : bits; |
219 | return ((a ^ b) << offset) >> (KEYLENGTH - bits) == 0; | |
c877efb2 | 220 | } |
19baf839 RO |
221 | |
222 | static inline int tkey_mismatch(t_key a, int offset, t_key b) | |
223 | { | |
224 | t_key diff = a ^ b; | |
225 | int i = offset; | |
226 | ||
c877efb2 SH |
227 | if (!diff) |
228 | return 0; | |
229 | while ((diff << i) >> (KEYLENGTH-1) == 0) | |
19baf839 RO |
230 | i++; |
231 | return i; | |
232 | } | |
233 | ||
19baf839 | 234 | /* |
e905a9ed YH |
235 | To understand this stuff, an understanding of keys and all their bits is |
236 | necessary. Every node in the trie has a key associated with it, but not | |
19baf839 RO |
237 | all of the bits in that key are significant. |
238 | ||
239 | Consider a node 'n' and its parent 'tp'. | |
240 | ||
e905a9ed YH |
241 | If n is a leaf, every bit in its key is significant. Its presence is |
242 | necessitated by path compression, since during a tree traversal (when | |
243 | searching for a leaf - unless we are doing an insertion) we will completely | |
244 | ignore all skipped bits we encounter. Thus we need to verify, at the end of | |
245 | a potentially successful search, that we have indeed been walking the | |
19baf839 RO |
246 | correct key path. |
247 | ||
e905a9ed YH |
248 | Note that we can never "miss" the correct key in the tree if present by |
249 | following the wrong path. Path compression ensures that segments of the key | |
250 | that are the same for all keys with a given prefix are skipped, but the | |
251 | skipped part *is* identical for each node in the subtrie below the skipped | |
252 | bit! trie_insert() in this implementation takes care of that - note the | |
19baf839 RO |
253 | call to tkey_sub_equals() in trie_insert(). |
254 | ||
e905a9ed | 255 | if n is an internal node - a 'tnode' here, the various parts of its key |
19baf839 RO |
256 | have many different meanings. |
257 | ||
e905a9ed | 258 | Example: |
19baf839 RO |
259 | _________________________________________________________________ |
260 | | i | i | i | i | i | i | i | N | N | N | S | S | S | S | S | C | | |
261 | ----------------------------------------------------------------- | |
e905a9ed | 262 | 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 |
19baf839 RO |
263 | |
264 | _________________________________________________________________ | |
265 | | C | C | C | u | u | u | u | u | u | u | u | u | u | u | u | u | | |
266 | ----------------------------------------------------------------- | |
267 | 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 | |
268 | ||
269 | tp->pos = 7 | |
270 | tp->bits = 3 | |
271 | n->pos = 15 | |
91b9a277 | 272 | n->bits = 4 |
19baf839 | 273 | |
e905a9ed YH |
274 | First, let's just ignore the bits that come before the parent tp, that is |
275 | the bits from 0 to (tp->pos-1). They are *known* but at this point we do | |
19baf839 RO |
276 | not use them for anything. |
277 | ||
278 | The bits from (tp->pos) to (tp->pos + tp->bits - 1) - "N", above - are the | |
e905a9ed | 279 | index into the parent's child array. That is, they will be used to find |
19baf839 RO |
280 | 'n' among tp's children. |
281 | ||
282 | The bits from (tp->pos + tp->bits) to (n->pos - 1) - "S" - are skipped bits | |
283 | for the node n. | |
284 | ||
e905a9ed | 285 | All the bits we have seen so far are significant to the node n. The rest |
19baf839 RO |
286 | of the bits are really not needed or indeed known in n->key. |
287 | ||
e905a9ed | 288 | The bits from (n->pos) to (n->pos + n->bits - 1) - "C" - are the index into |
19baf839 | 289 | n's child array, and will of course be different for each child. |
e905a9ed | 290 | |
c877efb2 | 291 | |
19baf839 RO |
292 | The rest of the bits, from (n->pos + n->bits) onward, are completely unknown |
293 | at this point. | |
294 | ||
295 | */ | |
296 | ||
0c7770c7 | 297 | static inline void check_tnode(const struct tnode *tn) |
19baf839 | 298 | { |
0c7770c7 | 299 | WARN_ON(tn && tn->pos+tn->bits > 32); |
19baf839 RO |
300 | } |
301 | ||
302 | static int halve_threshold = 25; | |
303 | static int inflate_threshold = 50; | |
965ffea4 RO |
304 | static int halve_threshold_root = 8; |
305 | static int inflate_threshold_root = 15; | |
19baf839 | 306 | |
2373ce1c RO |
307 | |
308 | static void __alias_free_mem(struct rcu_head *head) | |
19baf839 | 309 | { |
2373ce1c RO |
310 | struct fib_alias *fa = container_of(head, struct fib_alias, rcu); |
311 | kmem_cache_free(fn_alias_kmem, fa); | |
19baf839 RO |
312 | } |
313 | ||
2373ce1c | 314 | static inline void alias_free_mem_rcu(struct fib_alias *fa) |
19baf839 | 315 | { |
2373ce1c RO |
316 | call_rcu(&fa->rcu, __alias_free_mem); |
317 | } | |
91b9a277 | 318 | |
2373ce1c RO |
319 | static void __leaf_free_rcu(struct rcu_head *head) |
320 | { | |
321 | kfree(container_of(head, struct leaf, rcu)); | |
322 | } | |
91b9a277 | 323 | |
2373ce1c | 324 | static void __leaf_info_free_rcu(struct rcu_head *head) |
19baf839 | 325 | { |
2373ce1c | 326 | kfree(container_of(head, struct leaf_info, rcu)); |
19baf839 RO |
327 | } |
328 | ||
2373ce1c | 329 | static inline void free_leaf_info(struct leaf_info *leaf) |
19baf839 | 330 | { |
2373ce1c | 331 | call_rcu(&leaf->rcu, __leaf_info_free_rcu); |
19baf839 RO |
332 | } |
333 | ||
f0e36f8c PM |
334 | static struct tnode *tnode_alloc(unsigned int size) |
335 | { | |
2373ce1c RO |
336 | struct page *pages; |
337 | ||
338 | if (size <= PAGE_SIZE) | |
339 | return kcalloc(size, 1, GFP_KERNEL); | |
340 | ||
341 | pages = alloc_pages(GFP_KERNEL|__GFP_ZERO, get_order(size)); | |
342 | if (!pages) | |
343 | return NULL; | |
344 | ||
345 | return page_address(pages); | |
f0e36f8c PM |
346 | } |
347 | ||
2373ce1c | 348 | static void __tnode_free_rcu(struct rcu_head *head) |
f0e36f8c | 349 | { |
2373ce1c | 350 | struct tnode *tn = container_of(head, struct tnode, rcu); |
f0e36f8c | 351 | unsigned int size = sizeof(struct tnode) + |
2373ce1c | 352 | (1 << tn->bits) * sizeof(struct node *); |
f0e36f8c PM |
353 | |
354 | if (size <= PAGE_SIZE) | |
355 | kfree(tn); | |
356 | else | |
357 | free_pages((unsigned long)tn, get_order(size)); | |
358 | } | |
359 | ||
2373ce1c RO |
360 | static inline void tnode_free(struct tnode *tn) |
361 | { | |
132adf54 | 362 | if (IS_LEAF(tn)) { |
550e29bc RO |
363 | struct leaf *l = (struct leaf *) tn; |
364 | call_rcu_bh(&l->rcu, __leaf_free_rcu); | |
132adf54 | 365 | } else |
550e29bc | 366 | call_rcu(&tn->rcu, __tnode_free_rcu); |
2373ce1c RO |
367 | } |
368 | ||
369 | static struct leaf *leaf_new(void) | |
370 | { | |
371 | struct leaf *l = kmalloc(sizeof(struct leaf), GFP_KERNEL); | |
372 | if (l) { | |
373 | l->parent = T_LEAF; | |
374 | INIT_HLIST_HEAD(&l->list); | |
375 | } | |
376 | return l; | |
377 | } | |
378 | ||
379 | static struct leaf_info *leaf_info_new(int plen) | |
380 | { | |
381 | struct leaf_info *li = kmalloc(sizeof(struct leaf_info), GFP_KERNEL); | |
382 | if (li) { | |
383 | li->plen = plen; | |
384 | INIT_LIST_HEAD(&li->falh); | |
385 | } | |
386 | return li; | |
387 | } | |
388 | ||
19baf839 RO |
389 | static struct tnode* tnode_new(t_key key, int pos, int bits) |
390 | { | |
391 | int nchildren = 1<<bits; | |
392 | int sz = sizeof(struct tnode) + nchildren * sizeof(struct node *); | |
f0e36f8c | 393 | struct tnode *tn = tnode_alloc(sz); |
19baf839 | 394 | |
91b9a277 | 395 | if (tn) { |
19baf839 | 396 | memset(tn, 0, sz); |
2373ce1c | 397 | tn->parent = T_TNODE; |
19baf839 RO |
398 | tn->pos = pos; |
399 | tn->bits = bits; | |
400 | tn->key = key; | |
401 | tn->full_children = 0; | |
402 | tn->empty_children = 1<<bits; | |
403 | } | |
c877efb2 | 404 | |
0c7770c7 SH |
405 | pr_debug("AT %p s=%u %u\n", tn, (unsigned int) sizeof(struct tnode), |
406 | (unsigned int) (sizeof(struct node) * 1<<bits)); | |
19baf839 RO |
407 | return tn; |
408 | } | |
409 | ||
19baf839 RO |
410 | /* |
411 | * Check whether a tnode 'n' is "full", i.e. it is an internal node | |
412 | * and no bits are skipped. See discussion in dyntree paper p. 6 | |
413 | */ | |
414 | ||
bb435b8d | 415 | static inline int tnode_full(const struct tnode *tn, const struct node *n) |
19baf839 | 416 | { |
c877efb2 | 417 | if (n == NULL || IS_LEAF(n)) |
19baf839 RO |
418 | return 0; |
419 | ||
420 | return ((struct tnode *) n)->pos == tn->pos + tn->bits; | |
421 | } | |
422 | ||
c877efb2 | 423 | static inline void put_child(struct trie *t, struct tnode *tn, int i, struct node *n) |
19baf839 RO |
424 | { |
425 | tnode_put_child_reorg(tn, i, n, -1); | |
426 | } | |
427 | ||
c877efb2 | 428 | /* |
19baf839 RO |
429 | * Add a child at position i overwriting the old value. |
430 | * Update the value of full_children and empty_children. | |
431 | */ | |
432 | ||
c877efb2 | 433 | static void tnode_put_child_reorg(struct tnode *tn, int i, struct node *n, int wasfull) |
19baf839 | 434 | { |
2373ce1c | 435 | struct node *chi = tn->child[i]; |
19baf839 RO |
436 | int isfull; |
437 | ||
0c7770c7 SH |
438 | BUG_ON(i >= 1<<tn->bits); |
439 | ||
19baf839 RO |
440 | |
441 | /* update emptyChildren */ | |
442 | if (n == NULL && chi != NULL) | |
443 | tn->empty_children++; | |
444 | else if (n != NULL && chi == NULL) | |
445 | tn->empty_children--; | |
c877efb2 | 446 | |
19baf839 | 447 | /* update fullChildren */ |
91b9a277 | 448 | if (wasfull == -1) |
19baf839 RO |
449 | wasfull = tnode_full(tn, chi); |
450 | ||
451 | isfull = tnode_full(tn, n); | |
c877efb2 | 452 | if (wasfull && !isfull) |
19baf839 | 453 | tn->full_children--; |
c877efb2 | 454 | else if (!wasfull && isfull) |
19baf839 | 455 | tn->full_children++; |
91b9a277 | 456 | |
c877efb2 | 457 | if (n) |
06801916 | 458 | node_set_parent(n, tn); |
19baf839 | 459 | |
2373ce1c | 460 | rcu_assign_pointer(tn->child[i], n); |
19baf839 RO |
461 | } |
462 | ||
c877efb2 | 463 | static struct node *resize(struct trie *t, struct tnode *tn) |
19baf839 RO |
464 | { |
465 | int i; | |
2f36895a | 466 | int err = 0; |
2f80b3c8 | 467 | struct tnode *old_tn; |
e6308be8 RO |
468 | int inflate_threshold_use; |
469 | int halve_threshold_use; | |
05eee48c | 470 | int max_resize; |
19baf839 | 471 | |
e905a9ed | 472 | if (!tn) |
19baf839 RO |
473 | return NULL; |
474 | ||
0c7770c7 SH |
475 | pr_debug("In tnode_resize %p inflate_threshold=%d threshold=%d\n", |
476 | tn, inflate_threshold, halve_threshold); | |
19baf839 RO |
477 | |
478 | /* No children */ | |
479 | if (tn->empty_children == tnode_child_length(tn)) { | |
480 | tnode_free(tn); | |
481 | return NULL; | |
482 | } | |
483 | /* One child */ | |
484 | if (tn->empty_children == tnode_child_length(tn) - 1) | |
485 | for (i = 0; i < tnode_child_length(tn); i++) { | |
91b9a277 | 486 | struct node *n; |
19baf839 | 487 | |
91b9a277 | 488 | n = tn->child[i]; |
2373ce1c | 489 | if (!n) |
91b9a277 | 490 | continue; |
91b9a277 OJ |
491 | |
492 | /* compress one level */ | |
06801916 | 493 | node_set_parent(n, NULL); |
91b9a277 OJ |
494 | tnode_free(tn); |
495 | return n; | |
19baf839 | 496 | } |
c877efb2 | 497 | /* |
19baf839 RO |
498 | * Double as long as the resulting node has a number of |
499 | * nonempty nodes that are above the threshold. | |
500 | */ | |
501 | ||
502 | /* | |
c877efb2 SH |
503 | * From "Implementing a dynamic compressed trie" by Stefan Nilsson of |
504 | * the Helsinki University of Technology and Matti Tikkanen of Nokia | |
19baf839 | 505 | * Telecommunications, page 6: |
c877efb2 | 506 | * "A node is doubled if the ratio of non-empty children to all |
19baf839 RO |
507 | * children in the *doubled* node is at least 'high'." |
508 | * | |
c877efb2 SH |
509 | * 'high' in this instance is the variable 'inflate_threshold'. It |
510 | * is expressed as a percentage, so we multiply it with | |
511 | * tnode_child_length() and instead of multiplying by 2 (since the | |
512 | * child array will be doubled by inflate()) and multiplying | |
513 | * the left-hand side by 100 (to handle the percentage thing) we | |
19baf839 | 514 | * multiply the left-hand side by 50. |
c877efb2 SH |
515 | * |
516 | * The left-hand side may look a bit weird: tnode_child_length(tn) | |
517 | * - tn->empty_children is of course the number of non-null children | |
518 | * in the current node. tn->full_children is the number of "full" | |
19baf839 | 519 | * children, that is non-null tnodes with a skip value of 0. |
c877efb2 | 520 | * All of those will be doubled in the resulting inflated tnode, so |
19baf839 | 521 | * we just count them one extra time here. |
c877efb2 | 522 | * |
19baf839 | 523 | * A clearer way to write this would be: |
c877efb2 | 524 | * |
19baf839 | 525 | * to_be_doubled = tn->full_children; |
c877efb2 | 526 | * not_to_be_doubled = tnode_child_length(tn) - tn->empty_children - |
19baf839 RO |
527 | * tn->full_children; |
528 | * | |
529 | * new_child_length = tnode_child_length(tn) * 2; | |
530 | * | |
c877efb2 | 531 | * new_fill_factor = 100 * (not_to_be_doubled + 2*to_be_doubled) / |
19baf839 RO |
532 | * new_child_length; |
533 | * if (new_fill_factor >= inflate_threshold) | |
c877efb2 SH |
534 | * |
535 | * ...and so on, tho it would mess up the while () loop. | |
536 | * | |
19baf839 RO |
537 | * anyway, |
538 | * 100 * (not_to_be_doubled + 2*to_be_doubled) / new_child_length >= | |
539 | * inflate_threshold | |
c877efb2 | 540 | * |
19baf839 RO |
541 | * avoid a division: |
542 | * 100 * (not_to_be_doubled + 2*to_be_doubled) >= | |
543 | * inflate_threshold * new_child_length | |
c877efb2 | 544 | * |
19baf839 | 545 | * expand not_to_be_doubled and to_be_doubled, and shorten: |
c877efb2 | 546 | * 100 * (tnode_child_length(tn) - tn->empty_children + |
91b9a277 | 547 | * tn->full_children) >= inflate_threshold * new_child_length |
c877efb2 | 548 | * |
19baf839 | 549 | * expand new_child_length: |
c877efb2 | 550 | * 100 * (tnode_child_length(tn) - tn->empty_children + |
91b9a277 | 551 | * tn->full_children) >= |
19baf839 | 552 | * inflate_threshold * tnode_child_length(tn) * 2 |
c877efb2 | 553 | * |
19baf839 | 554 | * shorten again: |
c877efb2 | 555 | * 50 * (tn->full_children + tnode_child_length(tn) - |
91b9a277 | 556 | * tn->empty_children) >= inflate_threshold * |
19baf839 | 557 | * tnode_child_length(tn) |
c877efb2 | 558 | * |
19baf839 RO |
559 | */ |
560 | ||
561 | check_tnode(tn); | |
c877efb2 | 562 | |
e6308be8 RO |
563 | /* Keep root node larger */ |
564 | ||
132adf54 | 565 | if (!tn->parent) |
e6308be8 | 566 | inflate_threshold_use = inflate_threshold_root; |
e905a9ed | 567 | else |
e6308be8 RO |
568 | inflate_threshold_use = inflate_threshold; |
569 | ||
2f36895a | 570 | err = 0; |
05eee48c RO |
571 | max_resize = 10; |
572 | while ((tn->full_children > 0 && max_resize-- && | |
19baf839 | 573 | 50 * (tn->full_children + tnode_child_length(tn) - tn->empty_children) >= |
e6308be8 | 574 | inflate_threshold_use * tnode_child_length(tn))) { |
19baf839 | 575 | |
2f80b3c8 RO |
576 | old_tn = tn; |
577 | tn = inflate(t, tn); | |
578 | if (IS_ERR(tn)) { | |
579 | tn = old_tn; | |
2f36895a RO |
580 | #ifdef CONFIG_IP_FIB_TRIE_STATS |
581 | t->stats.resize_node_skipped++; | |
582 | #endif | |
583 | break; | |
584 | } | |
19baf839 RO |
585 | } |
586 | ||
05eee48c RO |
587 | if (max_resize < 0) { |
588 | if (!tn->parent) | |
589 | printk(KERN_WARNING "Fix inflate_threshold_root. Now=%d size=%d bits\n", | |
590 | inflate_threshold_root, tn->bits); | |
591 | else | |
592 | printk(KERN_WARNING "Fix inflate_threshold. Now=%d size=%d bits\n", | |
593 | inflate_threshold, tn->bits); | |
594 | } | |
595 | ||
19baf839 RO |
596 | check_tnode(tn); |
597 | ||
598 | /* | |
599 | * Halve as long as the number of empty children in this | |
600 | * node is above threshold. | |
601 | */ | |
2f36895a | 602 | |
e6308be8 RO |
603 | |
604 | /* Keep root node larger */ | |
605 | ||
132adf54 | 606 | if (!tn->parent) |
e6308be8 | 607 | halve_threshold_use = halve_threshold_root; |
e905a9ed | 608 | else |
e6308be8 RO |
609 | halve_threshold_use = halve_threshold; |
610 | ||
2f36895a | 611 | err = 0; |
05eee48c RO |
612 | max_resize = 10; |
613 | while (tn->bits > 1 && max_resize-- && | |
19baf839 | 614 | 100 * (tnode_child_length(tn) - tn->empty_children) < |
e6308be8 | 615 | halve_threshold_use * tnode_child_length(tn)) { |
2f36895a | 616 | |
2f80b3c8 RO |
617 | old_tn = tn; |
618 | tn = halve(t, tn); | |
619 | if (IS_ERR(tn)) { | |
620 | tn = old_tn; | |
2f36895a RO |
621 | #ifdef CONFIG_IP_FIB_TRIE_STATS |
622 | t->stats.resize_node_skipped++; | |
623 | #endif | |
624 | break; | |
625 | } | |
626 | } | |
19baf839 | 627 | |
05eee48c RO |
628 | if (max_resize < 0) { |
629 | if (!tn->parent) | |
630 | printk(KERN_WARNING "Fix halve_threshold_root. Now=%d size=%d bits\n", | |
631 | halve_threshold_root, tn->bits); | |
632 | else | |
633 | printk(KERN_WARNING "Fix halve_threshold. Now=%d size=%d bits\n", | |
634 | halve_threshold, tn->bits); | |
635 | } | |
c877efb2 | 636 | |
19baf839 | 637 | /* Only one child remains */ |
19baf839 RO |
638 | if (tn->empty_children == tnode_child_length(tn) - 1) |
639 | for (i = 0; i < tnode_child_length(tn); i++) { | |
91b9a277 | 640 | struct node *n; |
19baf839 | 641 | |
91b9a277 | 642 | n = tn->child[i]; |
2373ce1c | 643 | if (!n) |
91b9a277 | 644 | continue; |
91b9a277 OJ |
645 | |
646 | /* compress one level */ | |
647 | ||
06801916 | 648 | node_set_parent(n, NULL); |
91b9a277 OJ |
649 | tnode_free(tn); |
650 | return n; | |
19baf839 RO |
651 | } |
652 | ||
653 | return (struct node *) tn; | |
654 | } | |
655 | ||
2f80b3c8 | 656 | static struct tnode *inflate(struct trie *t, struct tnode *tn) |
19baf839 RO |
657 | { |
658 | struct tnode *inode; | |
659 | struct tnode *oldtnode = tn; | |
660 | int olen = tnode_child_length(tn); | |
661 | int i; | |
662 | ||
0c7770c7 | 663 | pr_debug("In inflate\n"); |
19baf839 RO |
664 | |
665 | tn = tnode_new(oldtnode->key, oldtnode->pos, oldtnode->bits + 1); | |
666 | ||
0c7770c7 | 667 | if (!tn) |
2f80b3c8 | 668 | return ERR_PTR(-ENOMEM); |
2f36895a RO |
669 | |
670 | /* | |
c877efb2 SH |
671 | * Preallocate and store tnodes before the actual work so we |
672 | * don't get into an inconsistent state if memory allocation | |
673 | * fails. In case of failure we return the oldnode and inflate | |
2f36895a RO |
674 | * of tnode is ignored. |
675 | */ | |
91b9a277 OJ |
676 | |
677 | for (i = 0; i < olen; i++) { | |
2f36895a RO |
678 | struct tnode *inode = (struct tnode *) tnode_get_child(oldtnode, i); |
679 | ||
680 | if (inode && | |
681 | IS_TNODE(inode) && | |
682 | inode->pos == oldtnode->pos + oldtnode->bits && | |
683 | inode->bits > 1) { | |
684 | struct tnode *left, *right; | |
ab66b4a7 | 685 | t_key m = ~0U << (KEYLENGTH - 1) >> inode->pos; |
c877efb2 | 686 | |
2f36895a RO |
687 | left = tnode_new(inode->key&(~m), inode->pos + 1, |
688 | inode->bits - 1); | |
2f80b3c8 RO |
689 | if (!left) |
690 | goto nomem; | |
91b9a277 | 691 | |
2f36895a RO |
692 | right = tnode_new(inode->key|m, inode->pos + 1, |
693 | inode->bits - 1); | |
694 | ||
e905a9ed | 695 | if (!right) { |
2f80b3c8 RO |
696 | tnode_free(left); |
697 | goto nomem; | |
e905a9ed | 698 | } |
2f36895a RO |
699 | |
700 | put_child(t, tn, 2*i, (struct node *) left); | |
701 | put_child(t, tn, 2*i+1, (struct node *) right); | |
702 | } | |
703 | } | |
704 | ||
91b9a277 | 705 | for (i = 0; i < olen; i++) { |
19baf839 | 706 | struct node *node = tnode_get_child(oldtnode, i); |
91b9a277 OJ |
707 | struct tnode *left, *right; |
708 | int size, j; | |
c877efb2 | 709 | |
19baf839 RO |
710 | /* An empty child */ |
711 | if (node == NULL) | |
712 | continue; | |
713 | ||
714 | /* A leaf or an internal node with skipped bits */ | |
715 | ||
c877efb2 | 716 | if (IS_LEAF(node) || ((struct tnode *) node)->pos > |
19baf839 | 717 | tn->pos + tn->bits - 1) { |
c877efb2 | 718 | if (tkey_extract_bits(node->key, oldtnode->pos + oldtnode->bits, |
19baf839 RO |
719 | 1) == 0) |
720 | put_child(t, tn, 2*i, node); | |
721 | else | |
722 | put_child(t, tn, 2*i+1, node); | |
723 | continue; | |
724 | } | |
725 | ||
726 | /* An internal node with two children */ | |
727 | inode = (struct tnode *) node; | |
728 | ||
729 | if (inode->bits == 1) { | |
730 | put_child(t, tn, 2*i, inode->child[0]); | |
731 | put_child(t, tn, 2*i+1, inode->child[1]); | |
732 | ||
733 | tnode_free(inode); | |
91b9a277 | 734 | continue; |
19baf839 RO |
735 | } |
736 | ||
91b9a277 OJ |
737 | /* An internal node with more than two children */ |
738 | ||
739 | /* We will replace this node 'inode' with two new | |
740 | * ones, 'left' and 'right', each with half of the | |
741 | * original children. The two new nodes will have | |
742 | * a position one bit further down the key and this | |
743 | * means that the "significant" part of their keys | |
744 | * (see the discussion near the top of this file) | |
745 | * will differ by one bit, which will be "0" in | |
746 | * left's key and "1" in right's key. Since we are | |
747 | * moving the key position by one step, the bit that | |
748 | * we are moving away from - the bit at position | |
749 | * (inode->pos) - is the one that will differ between | |
750 | * left and right. So... we synthesize that bit in the | |
751 | * two new keys. | |
752 | * The mask 'm' below will be a single "one" bit at | |
753 | * the position (inode->pos) | |
754 | */ | |
19baf839 | 755 | |
91b9a277 OJ |
756 | /* Use the old key, but set the new significant |
757 | * bit to zero. | |
758 | */ | |
2f36895a | 759 | |
91b9a277 OJ |
760 | left = (struct tnode *) tnode_get_child(tn, 2*i); |
761 | put_child(t, tn, 2*i, NULL); | |
2f36895a | 762 | |
91b9a277 | 763 | BUG_ON(!left); |
2f36895a | 764 | |
91b9a277 OJ |
765 | right = (struct tnode *) tnode_get_child(tn, 2*i+1); |
766 | put_child(t, tn, 2*i+1, NULL); | |
19baf839 | 767 | |
91b9a277 | 768 | BUG_ON(!right); |
19baf839 | 769 | |
91b9a277 OJ |
770 | size = tnode_child_length(left); |
771 | for (j = 0; j < size; j++) { | |
772 | put_child(t, left, j, inode->child[j]); | |
773 | put_child(t, right, j, inode->child[j + size]); | |
19baf839 | 774 | } |
91b9a277 OJ |
775 | put_child(t, tn, 2*i, resize(t, left)); |
776 | put_child(t, tn, 2*i+1, resize(t, right)); | |
777 | ||
778 | tnode_free(inode); | |
19baf839 RO |
779 | } |
780 | tnode_free(oldtnode); | |
781 | return tn; | |
2f80b3c8 RO |
782 | nomem: |
783 | { | |
784 | int size = tnode_child_length(tn); | |
785 | int j; | |
786 | ||
0c7770c7 | 787 | for (j = 0; j < size; j++) |
2f80b3c8 RO |
788 | if (tn->child[j]) |
789 | tnode_free((struct tnode *)tn->child[j]); | |
790 | ||
791 | tnode_free(tn); | |
0c7770c7 | 792 | |
2f80b3c8 RO |
793 | return ERR_PTR(-ENOMEM); |
794 | } | |
19baf839 RO |
795 | } |
796 | ||
2f80b3c8 | 797 | static struct tnode *halve(struct trie *t, struct tnode *tn) |
19baf839 RO |
798 | { |
799 | struct tnode *oldtnode = tn; | |
800 | struct node *left, *right; | |
801 | int i; | |
802 | int olen = tnode_child_length(tn); | |
803 | ||
0c7770c7 | 804 | pr_debug("In halve\n"); |
c877efb2 SH |
805 | |
806 | tn = tnode_new(oldtnode->key, oldtnode->pos, oldtnode->bits - 1); | |
19baf839 | 807 | |
2f80b3c8 RO |
808 | if (!tn) |
809 | return ERR_PTR(-ENOMEM); | |
2f36895a RO |
810 | |
811 | /* | |
c877efb2 SH |
812 | * Preallocate and store tnodes before the actual work so we |
813 | * don't get into an inconsistent state if memory allocation | |
814 | * fails. In case of failure we return the oldnode and halve | |
2f36895a RO |
815 | * of tnode is ignored. |
816 | */ | |
817 | ||
91b9a277 | 818 | for (i = 0; i < olen; i += 2) { |
2f36895a RO |
819 | left = tnode_get_child(oldtnode, i); |
820 | right = tnode_get_child(oldtnode, i+1); | |
c877efb2 | 821 | |
2f36895a | 822 | /* Two nonempty children */ |
0c7770c7 | 823 | if (left && right) { |
2f80b3c8 | 824 | struct tnode *newn; |
0c7770c7 | 825 | |
2f80b3c8 | 826 | newn = tnode_new(left->key, tn->pos + tn->bits, 1); |
0c7770c7 SH |
827 | |
828 | if (!newn) | |
2f80b3c8 | 829 | goto nomem; |
0c7770c7 | 830 | |
2f80b3c8 | 831 | put_child(t, tn, i/2, (struct node *)newn); |
2f36895a | 832 | } |
2f36895a | 833 | |
2f36895a | 834 | } |
19baf839 | 835 | |
91b9a277 OJ |
836 | for (i = 0; i < olen; i += 2) { |
837 | struct tnode *newBinNode; | |
838 | ||
19baf839 RO |
839 | left = tnode_get_child(oldtnode, i); |
840 | right = tnode_get_child(oldtnode, i+1); | |
c877efb2 | 841 | |
19baf839 RO |
842 | /* At least one of the children is empty */ |
843 | if (left == NULL) { | |
844 | if (right == NULL) /* Both are empty */ | |
845 | continue; | |
846 | put_child(t, tn, i/2, right); | |
91b9a277 | 847 | continue; |
0c7770c7 | 848 | } |
91b9a277 OJ |
849 | |
850 | if (right == NULL) { | |
19baf839 | 851 | put_child(t, tn, i/2, left); |
91b9a277 OJ |
852 | continue; |
853 | } | |
c877efb2 | 854 | |
19baf839 | 855 | /* Two nonempty children */ |
91b9a277 OJ |
856 | newBinNode = (struct tnode *) tnode_get_child(tn, i/2); |
857 | put_child(t, tn, i/2, NULL); | |
91b9a277 OJ |
858 | put_child(t, newBinNode, 0, left); |
859 | put_child(t, newBinNode, 1, right); | |
860 | put_child(t, tn, i/2, resize(t, newBinNode)); | |
19baf839 RO |
861 | } |
862 | tnode_free(oldtnode); | |
863 | return tn; | |
2f80b3c8 RO |
864 | nomem: |
865 | { | |
866 | int size = tnode_child_length(tn); | |
867 | int j; | |
868 | ||
0c7770c7 | 869 | for (j = 0; j < size; j++) |
2f80b3c8 RO |
870 | if (tn->child[j]) |
871 | tnode_free((struct tnode *)tn->child[j]); | |
872 | ||
873 | tnode_free(tn); | |
0c7770c7 | 874 | |
2f80b3c8 RO |
875 | return ERR_PTR(-ENOMEM); |
876 | } | |
19baf839 RO |
877 | } |
878 | ||
91b9a277 | 879 | static void trie_init(struct trie *t) |
19baf839 | 880 | { |
91b9a277 OJ |
881 | if (!t) |
882 | return; | |
883 | ||
884 | t->size = 0; | |
2373ce1c | 885 | rcu_assign_pointer(t->trie, NULL); |
91b9a277 | 886 | t->revision = 0; |
19baf839 | 887 | #ifdef CONFIG_IP_FIB_TRIE_STATS |
91b9a277 | 888 | memset(&t->stats, 0, sizeof(struct trie_use_stats)); |
19baf839 | 889 | #endif |
19baf839 RO |
890 | } |
891 | ||
772cb712 | 892 | /* readside must use rcu_read_lock currently dump routines |
2373ce1c RO |
893 | via get_fa_head and dump */ |
894 | ||
772cb712 | 895 | static struct leaf_info *find_leaf_info(struct leaf *l, int plen) |
19baf839 | 896 | { |
772cb712 | 897 | struct hlist_head *head = &l->list; |
19baf839 RO |
898 | struct hlist_node *node; |
899 | struct leaf_info *li; | |
900 | ||
2373ce1c | 901 | hlist_for_each_entry_rcu(li, node, head, hlist) |
c877efb2 | 902 | if (li->plen == plen) |
19baf839 | 903 | return li; |
91b9a277 | 904 | |
19baf839 RO |
905 | return NULL; |
906 | } | |
907 | ||
908 | static inline struct list_head * get_fa_head(struct leaf *l, int plen) | |
909 | { | |
772cb712 | 910 | struct leaf_info *li = find_leaf_info(l, plen); |
c877efb2 | 911 | |
91b9a277 OJ |
912 | if (!li) |
913 | return NULL; | |
c877efb2 | 914 | |
91b9a277 | 915 | return &li->falh; |
19baf839 RO |
916 | } |
917 | ||
918 | static void insert_leaf_info(struct hlist_head *head, struct leaf_info *new) | |
919 | { | |
e905a9ed YH |
920 | struct leaf_info *li = NULL, *last = NULL; |
921 | struct hlist_node *node; | |
922 | ||
923 | if (hlist_empty(head)) { | |
924 | hlist_add_head_rcu(&new->hlist, head); | |
925 | } else { | |
926 | hlist_for_each_entry(li, node, head, hlist) { | |
927 | if (new->plen > li->plen) | |
928 | break; | |
929 | ||
930 | last = li; | |
931 | } | |
932 | if (last) | |
933 | hlist_add_after_rcu(&last->hlist, &new->hlist); | |
934 | else | |
935 | hlist_add_before_rcu(&new->hlist, &li->hlist); | |
936 | } | |
19baf839 RO |
937 | } |
938 | ||
2373ce1c RO |
939 | /* rcu_read_lock needs to be hold by caller from readside */ |
940 | ||
19baf839 RO |
941 | static struct leaf * |
942 | fib_find_node(struct trie *t, u32 key) | |
943 | { | |
944 | int pos; | |
945 | struct tnode *tn; | |
946 | struct node *n; | |
947 | ||
948 | pos = 0; | |
2373ce1c | 949 | n = rcu_dereference(t->trie); |
19baf839 RO |
950 | |
951 | while (n != NULL && NODE_TYPE(n) == T_TNODE) { | |
952 | tn = (struct tnode *) n; | |
91b9a277 | 953 | |
19baf839 | 954 | check_tnode(tn); |
91b9a277 | 955 | |
c877efb2 | 956 | if (tkey_sub_equals(tn->key, pos, tn->pos-pos, key)) { |
91b9a277 | 957 | pos = tn->pos + tn->bits; |
19baf839 | 958 | n = tnode_get_child(tn, tkey_extract_bits(key, tn->pos, tn->bits)); |
91b9a277 | 959 | } else |
19baf839 RO |
960 | break; |
961 | } | |
962 | /* Case we have found a leaf. Compare prefixes */ | |
963 | ||
91b9a277 OJ |
964 | if (n != NULL && IS_LEAF(n) && tkey_equals(key, n->key)) |
965 | return (struct leaf *)n; | |
966 | ||
19baf839 RO |
967 | return NULL; |
968 | } | |
969 | ||
970 | static struct node *trie_rebalance(struct trie *t, struct tnode *tn) | |
971 | { | |
19baf839 | 972 | int wasfull; |
06801916 SH |
973 | t_key cindex, key = tn->key; |
974 | struct tnode *tp; | |
19baf839 | 975 | |
06801916 | 976 | while (tn != NULL && (tp = node_parent((struct node *)tn)) != NULL) { |
19baf839 RO |
977 | cindex = tkey_extract_bits(key, tp->pos, tp->bits); |
978 | wasfull = tnode_full(tp, tnode_get_child(tp, cindex)); | |
979 | tn = (struct tnode *) resize (t, (struct tnode *)tn); | |
980 | tnode_put_child_reorg((struct tnode *)tp, cindex,(struct node*)tn, wasfull); | |
91b9a277 | 981 | |
06801916 SH |
982 | tp = node_parent((struct node *) tn); |
983 | if (!tp) | |
19baf839 | 984 | break; |
06801916 | 985 | tn = tp; |
19baf839 | 986 | } |
06801916 | 987 | |
19baf839 | 988 | /* Handle last (top) tnode */ |
c877efb2 | 989 | if (IS_TNODE(tn)) |
19baf839 RO |
990 | tn = (struct tnode*) resize(t, (struct tnode *)tn); |
991 | ||
992 | return (struct node*) tn; | |
993 | } | |
994 | ||
2373ce1c RO |
995 | /* only used from updater-side */ |
996 | ||
f835e471 RO |
997 | static struct list_head * |
998 | fib_insert_node(struct trie *t, int *err, u32 key, int plen) | |
19baf839 RO |
999 | { |
1000 | int pos, newpos; | |
1001 | struct tnode *tp = NULL, *tn = NULL; | |
1002 | struct node *n; | |
1003 | struct leaf *l; | |
1004 | int missbit; | |
c877efb2 | 1005 | struct list_head *fa_head = NULL; |
19baf839 RO |
1006 | struct leaf_info *li; |
1007 | t_key cindex; | |
1008 | ||
1009 | pos = 0; | |
c877efb2 | 1010 | n = t->trie; |
19baf839 | 1011 | |
c877efb2 SH |
1012 | /* If we point to NULL, stop. Either the tree is empty and we should |
1013 | * just put a new leaf in if, or we have reached an empty child slot, | |
19baf839 | 1014 | * and we should just put our new leaf in that. |
c877efb2 SH |
1015 | * If we point to a T_TNODE, check if it matches our key. Note that |
1016 | * a T_TNODE might be skipping any number of bits - its 'pos' need | |
19baf839 RO |
1017 | * not be the parent's 'pos'+'bits'! |
1018 | * | |
c877efb2 | 1019 | * If it does match the current key, get pos/bits from it, extract |
19baf839 RO |
1020 | * the index from our key, push the T_TNODE and walk the tree. |
1021 | * | |
1022 | * If it doesn't, we have to replace it with a new T_TNODE. | |
1023 | * | |
c877efb2 SH |
1024 | * If we point to a T_LEAF, it might or might not have the same key |
1025 | * as we do. If it does, just change the value, update the T_LEAF's | |
1026 | * value, and return it. | |
19baf839 RO |
1027 | * If it doesn't, we need to replace it with a T_TNODE. |
1028 | */ | |
1029 | ||
1030 | while (n != NULL && NODE_TYPE(n) == T_TNODE) { | |
1031 | tn = (struct tnode *) n; | |
91b9a277 | 1032 | |
c877efb2 | 1033 | check_tnode(tn); |
91b9a277 | 1034 | |
c877efb2 | 1035 | if (tkey_sub_equals(tn->key, pos, tn->pos-pos, key)) { |
19baf839 | 1036 | tp = tn; |
91b9a277 | 1037 | pos = tn->pos + tn->bits; |
19baf839 RO |
1038 | n = tnode_get_child(tn, tkey_extract_bits(key, tn->pos, tn->bits)); |
1039 | ||
06801916 | 1040 | BUG_ON(n && node_parent(n) != tn); |
91b9a277 | 1041 | } else |
19baf839 RO |
1042 | break; |
1043 | } | |
1044 | ||
1045 | /* | |
1046 | * n ----> NULL, LEAF or TNODE | |
1047 | * | |
c877efb2 | 1048 | * tp is n's (parent) ----> NULL or TNODE |
19baf839 RO |
1049 | */ |
1050 | ||
91b9a277 | 1051 | BUG_ON(tp && IS_LEAF(tp)); |
19baf839 RO |
1052 | |
1053 | /* Case 1: n is a leaf. Compare prefixes */ | |
1054 | ||
c877efb2 | 1055 | if (n != NULL && IS_LEAF(n) && tkey_equals(key, n->key)) { |
91b9a277 OJ |
1056 | struct leaf *l = (struct leaf *) n; |
1057 | ||
19baf839 | 1058 | li = leaf_info_new(plen); |
91b9a277 | 1059 | |
c877efb2 | 1060 | if (!li) { |
f835e471 RO |
1061 | *err = -ENOMEM; |
1062 | goto err; | |
1063 | } | |
19baf839 RO |
1064 | |
1065 | fa_head = &li->falh; | |
1066 | insert_leaf_info(&l->list, li); | |
1067 | goto done; | |
1068 | } | |
1069 | t->size++; | |
1070 | l = leaf_new(); | |
1071 | ||
c877efb2 | 1072 | if (!l) { |
f835e471 RO |
1073 | *err = -ENOMEM; |
1074 | goto err; | |
1075 | } | |
19baf839 RO |
1076 | |
1077 | l->key = key; | |
1078 | li = leaf_info_new(plen); | |
1079 | ||
c877efb2 | 1080 | if (!li) { |
f835e471 RO |
1081 | tnode_free((struct tnode *) l); |
1082 | *err = -ENOMEM; | |
1083 | goto err; | |
1084 | } | |
19baf839 RO |
1085 | |
1086 | fa_head = &li->falh; | |
1087 | insert_leaf_info(&l->list, li); | |
1088 | ||
19baf839 | 1089 | if (t->trie && n == NULL) { |
91b9a277 | 1090 | /* Case 2: n is NULL, and will just insert a new leaf */ |
19baf839 | 1091 | |
06801916 | 1092 | node_set_parent((struct node *)l, tp); |
19baf839 | 1093 | |
91b9a277 OJ |
1094 | cindex = tkey_extract_bits(key, tp->pos, tp->bits); |
1095 | put_child(t, (struct tnode *)tp, cindex, (struct node *)l); | |
1096 | } else { | |
1097 | /* Case 3: n is a LEAF or a TNODE and the key doesn't match. */ | |
c877efb2 SH |
1098 | /* |
1099 | * Add a new tnode here | |
19baf839 RO |
1100 | * first tnode need some special handling |
1101 | */ | |
1102 | ||
1103 | if (tp) | |
91b9a277 | 1104 | pos = tp->pos+tp->bits; |
19baf839 | 1105 | else |
91b9a277 OJ |
1106 | pos = 0; |
1107 | ||
c877efb2 | 1108 | if (n) { |
19baf839 RO |
1109 | newpos = tkey_mismatch(key, pos, n->key); |
1110 | tn = tnode_new(n->key, newpos, 1); | |
91b9a277 | 1111 | } else { |
19baf839 | 1112 | newpos = 0; |
c877efb2 | 1113 | tn = tnode_new(key, newpos, 1); /* First tnode */ |
19baf839 | 1114 | } |
19baf839 | 1115 | |
c877efb2 | 1116 | if (!tn) { |
f835e471 RO |
1117 | free_leaf_info(li); |
1118 | tnode_free((struct tnode *) l); | |
1119 | *err = -ENOMEM; | |
1120 | goto err; | |
91b9a277 OJ |
1121 | } |
1122 | ||
06801916 | 1123 | node_set_parent((struct node *)tn, tp); |
19baf839 | 1124 | |
91b9a277 | 1125 | missbit = tkey_extract_bits(key, newpos, 1); |
19baf839 RO |
1126 | put_child(t, tn, missbit, (struct node *)l); |
1127 | put_child(t, tn, 1-missbit, n); | |
1128 | ||
c877efb2 | 1129 | if (tp) { |
19baf839 RO |
1130 | cindex = tkey_extract_bits(key, tp->pos, tp->bits); |
1131 | put_child(t, (struct tnode *)tp, cindex, (struct node *)tn); | |
91b9a277 | 1132 | } else { |
2373ce1c | 1133 | rcu_assign_pointer(t->trie, (struct node *)tn); /* First tnode */ |
19baf839 RO |
1134 | tp = tn; |
1135 | } | |
1136 | } | |
91b9a277 OJ |
1137 | |
1138 | if (tp && tp->pos + tp->bits > 32) | |
78c6671a | 1139 | printk(KERN_WARNING "fib_trie tp=%p pos=%d, bits=%d, key=%0x plen=%d\n", |
19baf839 | 1140 | tp, tp->pos, tp->bits, key, plen); |
91b9a277 | 1141 | |
19baf839 | 1142 | /* Rebalance the trie */ |
2373ce1c RO |
1143 | |
1144 | rcu_assign_pointer(t->trie, trie_rebalance(t, tp)); | |
f835e471 RO |
1145 | done: |
1146 | t->revision++; | |
91b9a277 | 1147 | err: |
19baf839 RO |
1148 | return fa_head; |
1149 | } | |
1150 | ||
d562f1f8 RO |
1151 | /* |
1152 | * Caller must hold RTNL. | |
1153 | */ | |
4e902c57 | 1154 | static int fn_trie_insert(struct fib_table *tb, struct fib_config *cfg) |
19baf839 RO |
1155 | { |
1156 | struct trie *t = (struct trie *) tb->tb_data; | |
1157 | struct fib_alias *fa, *new_fa; | |
c877efb2 | 1158 | struct list_head *fa_head = NULL; |
19baf839 | 1159 | struct fib_info *fi; |
4e902c57 TG |
1160 | int plen = cfg->fc_dst_len; |
1161 | u8 tos = cfg->fc_tos; | |
19baf839 RO |
1162 | u32 key, mask; |
1163 | int err; | |
1164 | struct leaf *l; | |
1165 | ||
1166 | if (plen > 32) | |
1167 | return -EINVAL; | |
1168 | ||
4e902c57 | 1169 | key = ntohl(cfg->fc_dst); |
19baf839 | 1170 | |
2dfe55b4 | 1171 | pr_debug("Insert table=%u %08x/%d\n", tb->tb_id, key, plen); |
19baf839 | 1172 | |
91b9a277 | 1173 | mask = ntohl(inet_make_mask(plen)); |
19baf839 | 1174 | |
c877efb2 | 1175 | if (key & ~mask) |
19baf839 RO |
1176 | return -EINVAL; |
1177 | ||
1178 | key = key & mask; | |
1179 | ||
4e902c57 TG |
1180 | fi = fib_create_info(cfg); |
1181 | if (IS_ERR(fi)) { | |
1182 | err = PTR_ERR(fi); | |
19baf839 | 1183 | goto err; |
4e902c57 | 1184 | } |
19baf839 RO |
1185 | |
1186 | l = fib_find_node(t, key); | |
c877efb2 | 1187 | fa = NULL; |
19baf839 | 1188 | |
c877efb2 | 1189 | if (l) { |
19baf839 RO |
1190 | fa_head = get_fa_head(l, plen); |
1191 | fa = fib_find_alias(fa_head, tos, fi->fib_priority); | |
1192 | } | |
1193 | ||
1194 | /* Now fa, if non-NULL, points to the first fib alias | |
1195 | * with the same keys [prefix,tos,priority], if such key already | |
1196 | * exists or to the node before which we will insert new one. | |
1197 | * | |
1198 | * If fa is NULL, we will need to allocate a new one and | |
1199 | * insert to the head of f. | |
1200 | * | |
1201 | * If f is NULL, no fib node matched the destination key | |
1202 | * and we need to allocate a new one of those as well. | |
1203 | */ | |
1204 | ||
91b9a277 | 1205 | if (fa && fa->fa_info->fib_priority == fi->fib_priority) { |
19baf839 RO |
1206 | struct fib_alias *fa_orig; |
1207 | ||
1208 | err = -EEXIST; | |
4e902c57 | 1209 | if (cfg->fc_nlflags & NLM_F_EXCL) |
19baf839 RO |
1210 | goto out; |
1211 | ||
4e902c57 | 1212 | if (cfg->fc_nlflags & NLM_F_REPLACE) { |
19baf839 RO |
1213 | struct fib_info *fi_drop; |
1214 | u8 state; | |
1215 | ||
6725033f JP |
1216 | if (fi->fib_treeref > 1) |
1217 | goto out; | |
1218 | ||
2373ce1c | 1219 | err = -ENOBUFS; |
e94b1766 | 1220 | new_fa = kmem_cache_alloc(fn_alias_kmem, GFP_KERNEL); |
2373ce1c RO |
1221 | if (new_fa == NULL) |
1222 | goto out; | |
19baf839 RO |
1223 | |
1224 | fi_drop = fa->fa_info; | |
2373ce1c RO |
1225 | new_fa->fa_tos = fa->fa_tos; |
1226 | new_fa->fa_info = fi; | |
4e902c57 TG |
1227 | new_fa->fa_type = cfg->fc_type; |
1228 | new_fa->fa_scope = cfg->fc_scope; | |
19baf839 | 1229 | state = fa->fa_state; |
2373ce1c | 1230 | new_fa->fa_state &= ~FA_S_ACCESSED; |
19baf839 | 1231 | |
2373ce1c RO |
1232 | list_replace_rcu(&fa->fa_list, &new_fa->fa_list); |
1233 | alias_free_mem_rcu(fa); | |
19baf839 RO |
1234 | |
1235 | fib_release_info(fi_drop); | |
1236 | if (state & FA_S_ACCESSED) | |
91b9a277 | 1237 | rt_cache_flush(-1); |
b8f55831 MK |
1238 | rtmsg_fib(RTM_NEWROUTE, htonl(key), new_fa, plen, |
1239 | tb->tb_id, &cfg->fc_nlinfo, NLM_F_REPLACE); | |
19baf839 | 1240 | |
91b9a277 | 1241 | goto succeeded; |
19baf839 RO |
1242 | } |
1243 | /* Error if we find a perfect match which | |
1244 | * uses the same scope, type, and nexthop | |
1245 | * information. | |
1246 | */ | |
1247 | fa_orig = fa; | |
1248 | list_for_each_entry(fa, fa_orig->fa_list.prev, fa_list) { | |
1249 | if (fa->fa_tos != tos) | |
1250 | break; | |
1251 | if (fa->fa_info->fib_priority != fi->fib_priority) | |
1252 | break; | |
4e902c57 TG |
1253 | if (fa->fa_type == cfg->fc_type && |
1254 | fa->fa_scope == cfg->fc_scope && | |
19baf839 RO |
1255 | fa->fa_info == fi) { |
1256 | goto out; | |
1257 | } | |
1258 | } | |
4e902c57 | 1259 | if (!(cfg->fc_nlflags & NLM_F_APPEND)) |
19baf839 RO |
1260 | fa = fa_orig; |
1261 | } | |
1262 | err = -ENOENT; | |
4e902c57 | 1263 | if (!(cfg->fc_nlflags & NLM_F_CREATE)) |
19baf839 RO |
1264 | goto out; |
1265 | ||
1266 | err = -ENOBUFS; | |
e94b1766 | 1267 | new_fa = kmem_cache_alloc(fn_alias_kmem, GFP_KERNEL); |
19baf839 RO |
1268 | if (new_fa == NULL) |
1269 | goto out; | |
1270 | ||
1271 | new_fa->fa_info = fi; | |
1272 | new_fa->fa_tos = tos; | |
4e902c57 TG |
1273 | new_fa->fa_type = cfg->fc_type; |
1274 | new_fa->fa_scope = cfg->fc_scope; | |
19baf839 | 1275 | new_fa->fa_state = 0; |
19baf839 RO |
1276 | /* |
1277 | * Insert new entry to the list. | |
1278 | */ | |
1279 | ||
c877efb2 | 1280 | if (!fa_head) { |
f835e471 | 1281 | err = 0; |
b47b2ec1 | 1282 | fa_head = fib_insert_node(t, &err, key, plen); |
c877efb2 | 1283 | if (err) |
f835e471 RO |
1284 | goto out_free_new_fa; |
1285 | } | |
19baf839 | 1286 | |
2373ce1c RO |
1287 | list_add_tail_rcu(&new_fa->fa_list, |
1288 | (fa ? &fa->fa_list : fa_head)); | |
19baf839 RO |
1289 | |
1290 | rt_cache_flush(-1); | |
4e902c57 | 1291 | rtmsg_fib(RTM_NEWROUTE, htonl(key), new_fa, plen, tb->tb_id, |
b8f55831 | 1292 | &cfg->fc_nlinfo, 0); |
19baf839 RO |
1293 | succeeded: |
1294 | return 0; | |
f835e471 RO |
1295 | |
1296 | out_free_new_fa: | |
1297 | kmem_cache_free(fn_alias_kmem, new_fa); | |
19baf839 RO |
1298 | out: |
1299 | fib_release_info(fi); | |
91b9a277 | 1300 | err: |
19baf839 RO |
1301 | return err; |
1302 | } | |
1303 | ||
2373ce1c | 1304 | |
772cb712 | 1305 | /* should be called with rcu_read_lock */ |
0c7770c7 SH |
1306 | static inline int check_leaf(struct trie *t, struct leaf *l, |
1307 | t_key key, int *plen, const struct flowi *flp, | |
06c74270 | 1308 | struct fib_result *res) |
19baf839 | 1309 | { |
06c74270 | 1310 | int err, i; |
888454c5 | 1311 | __be32 mask; |
19baf839 RO |
1312 | struct leaf_info *li; |
1313 | struct hlist_head *hhead = &l->list; | |
1314 | struct hlist_node *node; | |
c877efb2 | 1315 | |
2373ce1c | 1316 | hlist_for_each_entry_rcu(li, node, hhead, hlist) { |
19baf839 | 1317 | i = li->plen; |
888454c5 AV |
1318 | mask = inet_make_mask(i); |
1319 | if (l->key != (key & ntohl(mask))) | |
19baf839 RO |
1320 | continue; |
1321 | ||
888454c5 | 1322 | if ((err = fib_semantic_match(&li->falh, flp, res, htonl(l->key), mask, i)) <= 0) { |
19baf839 RO |
1323 | *plen = i; |
1324 | #ifdef CONFIG_IP_FIB_TRIE_STATS | |
1325 | t->stats.semantic_match_passed++; | |
1326 | #endif | |
06c74270 | 1327 | return err; |
19baf839 RO |
1328 | } |
1329 | #ifdef CONFIG_IP_FIB_TRIE_STATS | |
1330 | t->stats.semantic_match_miss++; | |
1331 | #endif | |
1332 | } | |
06c74270 | 1333 | return 1; |
19baf839 RO |
1334 | } |
1335 | ||
1336 | static int | |
1337 | fn_trie_lookup(struct fib_table *tb, const struct flowi *flp, struct fib_result *res) | |
1338 | { | |
1339 | struct trie *t = (struct trie *) tb->tb_data; | |
1340 | int plen, ret = 0; | |
1341 | struct node *n; | |
1342 | struct tnode *pn; | |
1343 | int pos, bits; | |
91b9a277 | 1344 | t_key key = ntohl(flp->fl4_dst); |
19baf839 RO |
1345 | int chopped_off; |
1346 | t_key cindex = 0; | |
1347 | int current_prefix_length = KEYLENGTH; | |
91b9a277 OJ |
1348 | struct tnode *cn; |
1349 | t_key node_prefix, key_prefix, pref_mismatch; | |
1350 | int mp; | |
1351 | ||
2373ce1c | 1352 | rcu_read_lock(); |
91b9a277 | 1353 | |
2373ce1c | 1354 | n = rcu_dereference(t->trie); |
c877efb2 | 1355 | if (!n) |
19baf839 RO |
1356 | goto failed; |
1357 | ||
1358 | #ifdef CONFIG_IP_FIB_TRIE_STATS | |
1359 | t->stats.gets++; | |
1360 | #endif | |
1361 | ||
1362 | /* Just a leaf? */ | |
1363 | if (IS_LEAF(n)) { | |
06c74270 | 1364 | if ((ret = check_leaf(t, (struct leaf *)n, key, &plen, flp, res)) <= 0) |
19baf839 RO |
1365 | goto found; |
1366 | goto failed; | |
1367 | } | |
1368 | pn = (struct tnode *) n; | |
1369 | chopped_off = 0; | |
c877efb2 | 1370 | |
91b9a277 | 1371 | while (pn) { |
19baf839 RO |
1372 | pos = pn->pos; |
1373 | bits = pn->bits; | |
1374 | ||
c877efb2 | 1375 | if (!chopped_off) |
ab66b4a7 SH |
1376 | cindex = tkey_extract_bits(mask_pfx(key, current_prefix_length), |
1377 | pos, bits); | |
19baf839 RO |
1378 | |
1379 | n = tnode_get_child(pn, cindex); | |
1380 | ||
1381 | if (n == NULL) { | |
1382 | #ifdef CONFIG_IP_FIB_TRIE_STATS | |
1383 | t->stats.null_node_hit++; | |
1384 | #endif | |
1385 | goto backtrace; | |
1386 | } | |
1387 | ||
91b9a277 OJ |
1388 | if (IS_LEAF(n)) { |
1389 | if ((ret = check_leaf(t, (struct leaf *)n, key, &plen, flp, res)) <= 0) | |
1390 | goto found; | |
1391 | else | |
1392 | goto backtrace; | |
1393 | } | |
1394 | ||
19baf839 RO |
1395 | #define HL_OPTIMIZE |
1396 | #ifdef HL_OPTIMIZE | |
91b9a277 | 1397 | cn = (struct tnode *)n; |
19baf839 | 1398 | |
91b9a277 OJ |
1399 | /* |
1400 | * It's a tnode, and we can do some extra checks here if we | |
1401 | * like, to avoid descending into a dead-end branch. | |
1402 | * This tnode is in the parent's child array at index | |
1403 | * key[p_pos..p_pos+p_bits] but potentially with some bits | |
1404 | * chopped off, so in reality the index may be just a | |
1405 | * subprefix, padded with zero at the end. | |
1406 | * We can also take a look at any skipped bits in this | |
1407 | * tnode - everything up to p_pos is supposed to be ok, | |
1408 | * and the non-chopped bits of the index (se previous | |
1409 | * paragraph) are also guaranteed ok, but the rest is | |
1410 | * considered unknown. | |
1411 | * | |
1412 | * The skipped bits are key[pos+bits..cn->pos]. | |
1413 | */ | |
19baf839 | 1414 | |
91b9a277 OJ |
1415 | /* If current_prefix_length < pos+bits, we are already doing |
1416 | * actual prefix matching, which means everything from | |
1417 | * pos+(bits-chopped_off) onward must be zero along some | |
1418 | * branch of this subtree - otherwise there is *no* valid | |
1419 | * prefix present. Here we can only check the skipped | |
1420 | * bits. Remember, since we have already indexed into the | |
1421 | * parent's child array, we know that the bits we chopped of | |
1422 | * *are* zero. | |
1423 | */ | |
19baf839 | 1424 | |
91b9a277 | 1425 | /* NOTA BENE: CHECKING ONLY SKIPPED BITS FOR THE NEW NODE HERE */ |
19baf839 | 1426 | |
91b9a277 OJ |
1427 | if (current_prefix_length < pos+bits) { |
1428 | if (tkey_extract_bits(cn->key, current_prefix_length, | |
1429 | cn->pos - current_prefix_length) != 0 || | |
1430 | !(cn->child[0])) | |
1431 | goto backtrace; | |
1432 | } | |
19baf839 | 1433 | |
91b9a277 OJ |
1434 | /* |
1435 | * If chopped_off=0, the index is fully validated and we | |
1436 | * only need to look at the skipped bits for this, the new, | |
1437 | * tnode. What we actually want to do is to find out if | |
1438 | * these skipped bits match our key perfectly, or if we will | |
1439 | * have to count on finding a matching prefix further down, | |
1440 | * because if we do, we would like to have some way of | |
1441 | * verifying the existence of such a prefix at this point. | |
1442 | */ | |
19baf839 | 1443 | |
91b9a277 OJ |
1444 | /* The only thing we can do at this point is to verify that |
1445 | * any such matching prefix can indeed be a prefix to our | |
1446 | * key, and if the bits in the node we are inspecting that | |
1447 | * do not match our key are not ZERO, this cannot be true. | |
1448 | * Thus, find out where there is a mismatch (before cn->pos) | |
1449 | * and verify that all the mismatching bits are zero in the | |
1450 | * new tnode's key. | |
1451 | */ | |
19baf839 | 1452 | |
91b9a277 OJ |
1453 | /* Note: We aren't very concerned about the piece of the key |
1454 | * that precede pn->pos+pn->bits, since these have already been | |
1455 | * checked. The bits after cn->pos aren't checked since these are | |
1456 | * by definition "unknown" at this point. Thus, what we want to | |
1457 | * see is if we are about to enter the "prefix matching" state, | |
1458 | * and in that case verify that the skipped bits that will prevail | |
1459 | * throughout this subtree are zero, as they have to be if we are | |
1460 | * to find a matching prefix. | |
1461 | */ | |
1462 | ||
ab66b4a7 SH |
1463 | node_prefix = mask_pfx(cn->key, cn->pos); |
1464 | key_prefix = mask_pfx(key, cn->pos); | |
91b9a277 OJ |
1465 | pref_mismatch = key_prefix^node_prefix; |
1466 | mp = 0; | |
1467 | ||
1468 | /* In short: If skipped bits in this node do not match the search | |
1469 | * key, enter the "prefix matching" state.directly. | |
1470 | */ | |
1471 | if (pref_mismatch) { | |
1472 | while (!(pref_mismatch & (1<<(KEYLENGTH-1)))) { | |
1473 | mp++; | |
1474 | pref_mismatch = pref_mismatch <<1; | |
1475 | } | |
1476 | key_prefix = tkey_extract_bits(cn->key, mp, cn->pos-mp); | |
1477 | ||
1478 | if (key_prefix != 0) | |
1479 | goto backtrace; | |
1480 | ||
1481 | if (current_prefix_length >= cn->pos) | |
1482 | current_prefix_length = mp; | |
c877efb2 | 1483 | } |
91b9a277 OJ |
1484 | #endif |
1485 | pn = (struct tnode *)n; /* Descend */ | |
1486 | chopped_off = 0; | |
1487 | continue; | |
1488 | ||
19baf839 RO |
1489 | backtrace: |
1490 | chopped_off++; | |
1491 | ||
1492 | /* As zero don't change the child key (cindex) */ | |
91b9a277 | 1493 | while ((chopped_off <= pn->bits) && !(cindex & (1<<(chopped_off-1)))) |
19baf839 | 1494 | chopped_off++; |
19baf839 RO |
1495 | |
1496 | /* Decrease current_... with bits chopped off */ | |
1497 | if (current_prefix_length > pn->pos + pn->bits - chopped_off) | |
1498 | current_prefix_length = pn->pos + pn->bits - chopped_off; | |
91b9a277 | 1499 | |
19baf839 | 1500 | /* |
c877efb2 | 1501 | * Either we do the actual chop off according or if we have |
19baf839 RO |
1502 | * chopped off all bits in this tnode walk up to our parent. |
1503 | */ | |
1504 | ||
91b9a277 | 1505 | if (chopped_off <= pn->bits) { |
19baf839 | 1506 | cindex &= ~(1 << (chopped_off-1)); |
91b9a277 | 1507 | } else { |
06801916 SH |
1508 | struct tnode *parent = node_parent((struct node *) pn); |
1509 | if (!parent) | |
19baf839 | 1510 | goto failed; |
91b9a277 | 1511 | |
19baf839 | 1512 | /* Get Child's index */ |
06801916 SH |
1513 | cindex = tkey_extract_bits(pn->key, parent->pos, parent->bits); |
1514 | pn = parent; | |
19baf839 RO |
1515 | chopped_off = 0; |
1516 | ||
1517 | #ifdef CONFIG_IP_FIB_TRIE_STATS | |
1518 | t->stats.backtrack++; | |
1519 | #endif | |
1520 | goto backtrace; | |
c877efb2 | 1521 | } |
19baf839 RO |
1522 | } |
1523 | failed: | |
c877efb2 | 1524 | ret = 1; |
19baf839 | 1525 | found: |
2373ce1c | 1526 | rcu_read_unlock(); |
19baf839 RO |
1527 | return ret; |
1528 | } | |
1529 | ||
2373ce1c | 1530 | /* only called from updater side */ |
19baf839 RO |
1531 | static int trie_leaf_remove(struct trie *t, t_key key) |
1532 | { | |
1533 | t_key cindex; | |
1534 | struct tnode *tp = NULL; | |
1535 | struct node *n = t->trie; | |
1536 | struct leaf *l; | |
1537 | ||
0c7770c7 | 1538 | pr_debug("entering trie_leaf_remove(%p)\n", n); |
19baf839 RO |
1539 | |
1540 | /* Note that in the case skipped bits, those bits are *not* checked! | |
c877efb2 | 1541 | * When we finish this, we will have NULL or a T_LEAF, and the |
19baf839 RO |
1542 | * T_LEAF may or may not match our key. |
1543 | */ | |
1544 | ||
91b9a277 | 1545 | while (n != NULL && IS_TNODE(n)) { |
19baf839 RO |
1546 | struct tnode *tn = (struct tnode *) n; |
1547 | check_tnode(tn); | |
1548 | n = tnode_get_child(tn ,tkey_extract_bits(key, tn->pos, tn->bits)); | |
1549 | ||
06801916 | 1550 | BUG_ON(n && node_parent(n) != tn); |
91b9a277 | 1551 | } |
19baf839 RO |
1552 | l = (struct leaf *) n; |
1553 | ||
c877efb2 | 1554 | if (!n || !tkey_equals(l->key, key)) |
19baf839 | 1555 | return 0; |
c877efb2 SH |
1556 | |
1557 | /* | |
1558 | * Key found. | |
1559 | * Remove the leaf and rebalance the tree | |
19baf839 RO |
1560 | */ |
1561 | ||
1562 | t->revision++; | |
1563 | t->size--; | |
1564 | ||
06801916 | 1565 | tp = node_parent(n); |
19baf839 RO |
1566 | tnode_free((struct tnode *) n); |
1567 | ||
c877efb2 | 1568 | if (tp) { |
19baf839 RO |
1569 | cindex = tkey_extract_bits(key, tp->pos, tp->bits); |
1570 | put_child(t, (struct tnode *)tp, cindex, NULL); | |
2373ce1c | 1571 | rcu_assign_pointer(t->trie, trie_rebalance(t, tp)); |
91b9a277 | 1572 | } else |
2373ce1c | 1573 | rcu_assign_pointer(t->trie, NULL); |
19baf839 RO |
1574 | |
1575 | return 1; | |
1576 | } | |
1577 | ||
d562f1f8 RO |
1578 | /* |
1579 | * Caller must hold RTNL. | |
1580 | */ | |
4e902c57 | 1581 | static int fn_trie_delete(struct fib_table *tb, struct fib_config *cfg) |
19baf839 RO |
1582 | { |
1583 | struct trie *t = (struct trie *) tb->tb_data; | |
1584 | u32 key, mask; | |
4e902c57 TG |
1585 | int plen = cfg->fc_dst_len; |
1586 | u8 tos = cfg->fc_tos; | |
19baf839 RO |
1587 | struct fib_alias *fa, *fa_to_delete; |
1588 | struct list_head *fa_head; | |
1589 | struct leaf *l; | |
91b9a277 OJ |
1590 | struct leaf_info *li; |
1591 | ||
c877efb2 | 1592 | if (plen > 32) |
19baf839 RO |
1593 | return -EINVAL; |
1594 | ||
4e902c57 | 1595 | key = ntohl(cfg->fc_dst); |
91b9a277 | 1596 | mask = ntohl(inet_make_mask(plen)); |
19baf839 | 1597 | |
c877efb2 | 1598 | if (key & ~mask) |
19baf839 RO |
1599 | return -EINVAL; |
1600 | ||
1601 | key = key & mask; | |
1602 | l = fib_find_node(t, key); | |
1603 | ||
c877efb2 | 1604 | if (!l) |
19baf839 RO |
1605 | return -ESRCH; |
1606 | ||
1607 | fa_head = get_fa_head(l, plen); | |
1608 | fa = fib_find_alias(fa_head, tos, 0); | |
1609 | ||
1610 | if (!fa) | |
1611 | return -ESRCH; | |
1612 | ||
0c7770c7 | 1613 | pr_debug("Deleting %08x/%d tos=%d t=%p\n", key, plen, tos, t); |
19baf839 RO |
1614 | |
1615 | fa_to_delete = NULL; | |
1616 | fa_head = fa->fa_list.prev; | |
2373ce1c | 1617 | |
19baf839 RO |
1618 | list_for_each_entry(fa, fa_head, fa_list) { |
1619 | struct fib_info *fi = fa->fa_info; | |
1620 | ||
1621 | if (fa->fa_tos != tos) | |
1622 | break; | |
1623 | ||
4e902c57 TG |
1624 | if ((!cfg->fc_type || fa->fa_type == cfg->fc_type) && |
1625 | (cfg->fc_scope == RT_SCOPE_NOWHERE || | |
1626 | fa->fa_scope == cfg->fc_scope) && | |
1627 | (!cfg->fc_protocol || | |
1628 | fi->fib_protocol == cfg->fc_protocol) && | |
1629 | fib_nh_match(cfg, fi) == 0) { | |
19baf839 RO |
1630 | fa_to_delete = fa; |
1631 | break; | |
1632 | } | |
1633 | } | |
1634 | ||
91b9a277 OJ |
1635 | if (!fa_to_delete) |
1636 | return -ESRCH; | |
19baf839 | 1637 | |
91b9a277 | 1638 | fa = fa_to_delete; |
4e902c57 | 1639 | rtmsg_fib(RTM_DELROUTE, htonl(key), fa, plen, tb->tb_id, |
b8f55831 | 1640 | &cfg->fc_nlinfo, 0); |
91b9a277 OJ |
1641 | |
1642 | l = fib_find_node(t, key); | |
772cb712 | 1643 | li = find_leaf_info(l, plen); |
19baf839 | 1644 | |
2373ce1c | 1645 | list_del_rcu(&fa->fa_list); |
19baf839 | 1646 | |
91b9a277 | 1647 | if (list_empty(fa_head)) { |
2373ce1c | 1648 | hlist_del_rcu(&li->hlist); |
91b9a277 | 1649 | free_leaf_info(li); |
2373ce1c | 1650 | } |
19baf839 | 1651 | |
91b9a277 OJ |
1652 | if (hlist_empty(&l->list)) |
1653 | trie_leaf_remove(t, key); | |
19baf839 | 1654 | |
91b9a277 OJ |
1655 | if (fa->fa_state & FA_S_ACCESSED) |
1656 | rt_cache_flush(-1); | |
19baf839 | 1657 | |
2373ce1c RO |
1658 | fib_release_info(fa->fa_info); |
1659 | alias_free_mem_rcu(fa); | |
91b9a277 | 1660 | return 0; |
19baf839 RO |
1661 | } |
1662 | ||
1663 | static int trie_flush_list(struct trie *t, struct list_head *head) | |
1664 | { | |
1665 | struct fib_alias *fa, *fa_node; | |
1666 | int found = 0; | |
1667 | ||
1668 | list_for_each_entry_safe(fa, fa_node, head, fa_list) { | |
1669 | struct fib_info *fi = fa->fa_info; | |
19baf839 | 1670 | |
2373ce1c RO |
1671 | if (fi && (fi->fib_flags & RTNH_F_DEAD)) { |
1672 | list_del_rcu(&fa->fa_list); | |
1673 | fib_release_info(fa->fa_info); | |
1674 | alias_free_mem_rcu(fa); | |
19baf839 RO |
1675 | found++; |
1676 | } | |
1677 | } | |
1678 | return found; | |
1679 | } | |
1680 | ||
1681 | static int trie_flush_leaf(struct trie *t, struct leaf *l) | |
1682 | { | |
1683 | int found = 0; | |
1684 | struct hlist_head *lih = &l->list; | |
1685 | struct hlist_node *node, *tmp; | |
1686 | struct leaf_info *li = NULL; | |
1687 | ||
1688 | hlist_for_each_entry_safe(li, node, tmp, lih, hlist) { | |
19baf839 RO |
1689 | found += trie_flush_list(t, &li->falh); |
1690 | ||
1691 | if (list_empty(&li->falh)) { | |
2373ce1c | 1692 | hlist_del_rcu(&li->hlist); |
19baf839 RO |
1693 | free_leaf_info(li); |
1694 | } | |
1695 | } | |
1696 | return found; | |
1697 | } | |
1698 | ||
2373ce1c RO |
1699 | /* rcu_read_lock needs to be hold by caller from readside */ |
1700 | ||
19baf839 RO |
1701 | static struct leaf *nextleaf(struct trie *t, struct leaf *thisleaf) |
1702 | { | |
1703 | struct node *c = (struct node *) thisleaf; | |
1704 | struct tnode *p; | |
1705 | int idx; | |
2373ce1c | 1706 | struct node *trie = rcu_dereference(t->trie); |
19baf839 | 1707 | |
c877efb2 | 1708 | if (c == NULL) { |
2373ce1c | 1709 | if (trie == NULL) |
19baf839 RO |
1710 | return NULL; |
1711 | ||
2373ce1c RO |
1712 | if (IS_LEAF(trie)) /* trie w. just a leaf */ |
1713 | return (struct leaf *) trie; | |
19baf839 | 1714 | |
2373ce1c | 1715 | p = (struct tnode*) trie; /* Start */ |
91b9a277 | 1716 | } else |
06801916 | 1717 | p = node_parent(c); |
c877efb2 | 1718 | |
19baf839 RO |
1719 | while (p) { |
1720 | int pos, last; | |
1721 | ||
1722 | /* Find the next child of the parent */ | |
c877efb2 SH |
1723 | if (c) |
1724 | pos = 1 + tkey_extract_bits(c->key, p->pos, p->bits); | |
1725 | else | |
19baf839 RO |
1726 | pos = 0; |
1727 | ||
1728 | last = 1 << p->bits; | |
91b9a277 | 1729 | for (idx = pos; idx < last ; idx++) { |
2373ce1c RO |
1730 | c = rcu_dereference(p->child[idx]); |
1731 | ||
1732 | if (!c) | |
91b9a277 OJ |
1733 | continue; |
1734 | ||
1735 | /* Decend if tnode */ | |
2373ce1c RO |
1736 | while (IS_TNODE(c)) { |
1737 | p = (struct tnode *) c; | |
e905a9ed | 1738 | idx = 0; |
91b9a277 OJ |
1739 | |
1740 | /* Rightmost non-NULL branch */ | |
1741 | if (p && IS_TNODE(p)) | |
2373ce1c RO |
1742 | while (!(c = rcu_dereference(p->child[idx])) |
1743 | && idx < (1<<p->bits)) idx++; | |
91b9a277 OJ |
1744 | |
1745 | /* Done with this tnode? */ | |
2373ce1c | 1746 | if (idx >= (1 << p->bits) || !c) |
91b9a277 | 1747 | goto up; |
19baf839 | 1748 | } |
2373ce1c | 1749 | return (struct leaf *) c; |
19baf839 RO |
1750 | } |
1751 | up: | |
1752 | /* No more children go up one step */ | |
91b9a277 | 1753 | c = (struct node *) p; |
06801916 | 1754 | p = node_parent(c); |
19baf839 RO |
1755 | } |
1756 | return NULL; /* Ready. Root of trie */ | |
1757 | } | |
1758 | ||
d562f1f8 RO |
1759 | /* |
1760 | * Caller must hold RTNL. | |
1761 | */ | |
19baf839 RO |
1762 | static int fn_trie_flush(struct fib_table *tb) |
1763 | { | |
1764 | struct trie *t = (struct trie *) tb->tb_data; | |
1765 | struct leaf *ll = NULL, *l = NULL; | |
1766 | int found = 0, h; | |
1767 | ||
1768 | t->revision++; | |
1769 | ||
91b9a277 | 1770 | for (h = 0; (l = nextleaf(t, l)) != NULL; h++) { |
19baf839 RO |
1771 | found += trie_flush_leaf(t, l); |
1772 | ||
1773 | if (ll && hlist_empty(&ll->list)) | |
1774 | trie_leaf_remove(t, ll->key); | |
1775 | ll = l; | |
1776 | } | |
1777 | ||
1778 | if (ll && hlist_empty(&ll->list)) | |
1779 | trie_leaf_remove(t, ll->key); | |
1780 | ||
0c7770c7 | 1781 | pr_debug("trie_flush found=%d\n", found); |
19baf839 RO |
1782 | return found; |
1783 | } | |
1784 | ||
91b9a277 | 1785 | static int trie_last_dflt = -1; |
19baf839 RO |
1786 | |
1787 | static void | |
1788 | fn_trie_select_default(struct fib_table *tb, const struct flowi *flp, struct fib_result *res) | |
1789 | { | |
1790 | struct trie *t = (struct trie *) tb->tb_data; | |
1791 | int order, last_idx; | |
1792 | struct fib_info *fi = NULL; | |
1793 | struct fib_info *last_resort; | |
1794 | struct fib_alias *fa = NULL; | |
1795 | struct list_head *fa_head; | |
1796 | struct leaf *l; | |
1797 | ||
1798 | last_idx = -1; | |
1799 | last_resort = NULL; | |
1800 | order = -1; | |
1801 | ||
2373ce1c | 1802 | rcu_read_lock(); |
c877efb2 | 1803 | |
19baf839 | 1804 | l = fib_find_node(t, 0); |
c877efb2 | 1805 | if (!l) |
19baf839 RO |
1806 | goto out; |
1807 | ||
1808 | fa_head = get_fa_head(l, 0); | |
c877efb2 | 1809 | if (!fa_head) |
19baf839 RO |
1810 | goto out; |
1811 | ||
c877efb2 | 1812 | if (list_empty(fa_head)) |
19baf839 RO |
1813 | goto out; |
1814 | ||
2373ce1c | 1815 | list_for_each_entry_rcu(fa, fa_head, fa_list) { |
19baf839 | 1816 | struct fib_info *next_fi = fa->fa_info; |
91b9a277 | 1817 | |
19baf839 RO |
1818 | if (fa->fa_scope != res->scope || |
1819 | fa->fa_type != RTN_UNICAST) | |
1820 | continue; | |
91b9a277 | 1821 | |
19baf839 RO |
1822 | if (next_fi->fib_priority > res->fi->fib_priority) |
1823 | break; | |
1824 | if (!next_fi->fib_nh[0].nh_gw || | |
1825 | next_fi->fib_nh[0].nh_scope != RT_SCOPE_LINK) | |
1826 | continue; | |
1827 | fa->fa_state |= FA_S_ACCESSED; | |
91b9a277 | 1828 | |
19baf839 RO |
1829 | if (fi == NULL) { |
1830 | if (next_fi != res->fi) | |
1831 | break; | |
1832 | } else if (!fib_detect_death(fi, order, &last_resort, | |
c17860a0 | 1833 | &last_idx, trie_last_dflt)) { |
19baf839 RO |
1834 | if (res->fi) |
1835 | fib_info_put(res->fi); | |
1836 | res->fi = fi; | |
1837 | atomic_inc(&fi->fib_clntref); | |
1838 | trie_last_dflt = order; | |
1839 | goto out; | |
1840 | } | |
1841 | fi = next_fi; | |
1842 | order++; | |
1843 | } | |
1844 | if (order <= 0 || fi == NULL) { | |
1845 | trie_last_dflt = -1; | |
1846 | goto out; | |
1847 | } | |
1848 | ||
c17860a0 | 1849 | if (!fib_detect_death(fi, order, &last_resort, &last_idx, trie_last_dflt)) { |
19baf839 RO |
1850 | if (res->fi) |
1851 | fib_info_put(res->fi); | |
1852 | res->fi = fi; | |
1853 | atomic_inc(&fi->fib_clntref); | |
1854 | trie_last_dflt = order; | |
1855 | goto out; | |
1856 | } | |
1857 | if (last_idx >= 0) { | |
1858 | if (res->fi) | |
1859 | fib_info_put(res->fi); | |
1860 | res->fi = last_resort; | |
1861 | if (last_resort) | |
1862 | atomic_inc(&last_resort->fib_clntref); | |
1863 | } | |
1864 | trie_last_dflt = last_idx; | |
1865 | out:; | |
2373ce1c | 1866 | rcu_read_unlock(); |
19baf839 RO |
1867 | } |
1868 | ||
c877efb2 | 1869 | static int fn_trie_dump_fa(t_key key, int plen, struct list_head *fah, struct fib_table *tb, |
19baf839 RO |
1870 | struct sk_buff *skb, struct netlink_callback *cb) |
1871 | { | |
1872 | int i, s_i; | |
1873 | struct fib_alias *fa; | |
1874 | ||
32ab5f80 | 1875 | __be32 xkey = htonl(key); |
19baf839 | 1876 | |
1af5a8c4 | 1877 | s_i = cb->args[4]; |
19baf839 RO |
1878 | i = 0; |
1879 | ||
2373ce1c RO |
1880 | /* rcu_read_lock is hold by caller */ |
1881 | ||
1882 | list_for_each_entry_rcu(fa, fah, fa_list) { | |
19baf839 RO |
1883 | if (i < s_i) { |
1884 | i++; | |
1885 | continue; | |
1886 | } | |
78c6671a | 1887 | BUG_ON(!fa->fa_info); |
19baf839 RO |
1888 | |
1889 | if (fib_dump_info(skb, NETLINK_CB(cb->skb).pid, | |
1890 | cb->nlh->nlmsg_seq, | |
1891 | RTM_NEWROUTE, | |
1892 | tb->tb_id, | |
1893 | fa->fa_type, | |
1894 | fa->fa_scope, | |
be403ea1 | 1895 | xkey, |
19baf839 RO |
1896 | plen, |
1897 | fa->fa_tos, | |
90f66914 | 1898 | fa->fa_info, 0) < 0) { |
1af5a8c4 | 1899 | cb->args[4] = i; |
19baf839 | 1900 | return -1; |
91b9a277 | 1901 | } |
19baf839 RO |
1902 | i++; |
1903 | } | |
1af5a8c4 | 1904 | cb->args[4] = i; |
19baf839 RO |
1905 | return skb->len; |
1906 | } | |
1907 | ||
c877efb2 | 1908 | static int fn_trie_dump_plen(struct trie *t, int plen, struct fib_table *tb, struct sk_buff *skb, |
19baf839 RO |
1909 | struct netlink_callback *cb) |
1910 | { | |
1911 | int h, s_h; | |
1912 | struct list_head *fa_head; | |
1913 | struct leaf *l = NULL; | |
19baf839 | 1914 | |
1af5a8c4 | 1915 | s_h = cb->args[3]; |
19baf839 | 1916 | |
91b9a277 | 1917 | for (h = 0; (l = nextleaf(t, l)) != NULL; h++) { |
19baf839 RO |
1918 | if (h < s_h) |
1919 | continue; | |
1920 | if (h > s_h) | |
1af5a8c4 PM |
1921 | memset(&cb->args[4], 0, |
1922 | sizeof(cb->args) - 4*sizeof(cb->args[0])); | |
19baf839 RO |
1923 | |
1924 | fa_head = get_fa_head(l, plen); | |
91b9a277 | 1925 | |
c877efb2 | 1926 | if (!fa_head) |
19baf839 RO |
1927 | continue; |
1928 | ||
c877efb2 | 1929 | if (list_empty(fa_head)) |
19baf839 RO |
1930 | continue; |
1931 | ||
1932 | if (fn_trie_dump_fa(l->key, plen, fa_head, tb, skb, cb)<0) { | |
1af5a8c4 | 1933 | cb->args[3] = h; |
19baf839 RO |
1934 | return -1; |
1935 | } | |
1936 | } | |
1af5a8c4 | 1937 | cb->args[3] = h; |
19baf839 RO |
1938 | return skb->len; |
1939 | } | |
1940 | ||
1941 | static int fn_trie_dump(struct fib_table *tb, struct sk_buff *skb, struct netlink_callback *cb) | |
1942 | { | |
1943 | int m, s_m; | |
1944 | struct trie *t = (struct trie *) tb->tb_data; | |
1945 | ||
1af5a8c4 | 1946 | s_m = cb->args[2]; |
19baf839 | 1947 | |
2373ce1c | 1948 | rcu_read_lock(); |
91b9a277 | 1949 | for (m = 0; m <= 32; m++) { |
19baf839 RO |
1950 | if (m < s_m) |
1951 | continue; | |
1952 | if (m > s_m) | |
1af5a8c4 PM |
1953 | memset(&cb->args[3], 0, |
1954 | sizeof(cb->args) - 3*sizeof(cb->args[0])); | |
19baf839 RO |
1955 | |
1956 | if (fn_trie_dump_plen(t, 32-m, tb, skb, cb)<0) { | |
1af5a8c4 | 1957 | cb->args[2] = m; |
19baf839 RO |
1958 | goto out; |
1959 | } | |
1960 | } | |
2373ce1c | 1961 | rcu_read_unlock(); |
1af5a8c4 | 1962 | cb->args[2] = m; |
19baf839 | 1963 | return skb->len; |
91b9a277 | 1964 | out: |
2373ce1c | 1965 | rcu_read_unlock(); |
19baf839 RO |
1966 | return -1; |
1967 | } | |
1968 | ||
1969 | /* Fix more generic FIB names for init later */ | |
1970 | ||
1971 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
2dfe55b4 | 1972 | struct fib_table * fib_hash_init(u32 id) |
19baf839 | 1973 | #else |
2dfe55b4 | 1974 | struct fib_table * __init fib_hash_init(u32 id) |
19baf839 RO |
1975 | #endif |
1976 | { | |
1977 | struct fib_table *tb; | |
1978 | struct trie *t; | |
1979 | ||
1980 | if (fn_alias_kmem == NULL) | |
1981 | fn_alias_kmem = kmem_cache_create("ip_fib_alias", | |
1982 | sizeof(struct fib_alias), | |
1983 | 0, SLAB_HWCACHE_ALIGN, | |
20c2df83 | 1984 | NULL); |
19baf839 RO |
1985 | |
1986 | tb = kmalloc(sizeof(struct fib_table) + sizeof(struct trie), | |
1987 | GFP_KERNEL); | |
1988 | if (tb == NULL) | |
1989 | return NULL; | |
1990 | ||
1991 | tb->tb_id = id; | |
1992 | tb->tb_lookup = fn_trie_lookup; | |
1993 | tb->tb_insert = fn_trie_insert; | |
1994 | tb->tb_delete = fn_trie_delete; | |
1995 | tb->tb_flush = fn_trie_flush; | |
1996 | tb->tb_select_default = fn_trie_select_default; | |
1997 | tb->tb_dump = fn_trie_dump; | |
1998 | memset(tb->tb_data, 0, sizeof(struct trie)); | |
1999 | ||
2000 | t = (struct trie *) tb->tb_data; | |
2001 | ||
2002 | trie_init(t); | |
2003 | ||
19baf839 | 2004 | if (id == RT_TABLE_LOCAL) |
78c6671a | 2005 | printk(KERN_INFO "IPv4 FIB: Using LC-trie version %s\n", VERSION); |
19baf839 RO |
2006 | |
2007 | return tb; | |
2008 | } | |
2009 | ||
cb7b593c SH |
2010 | #ifdef CONFIG_PROC_FS |
2011 | /* Depth first Trie walk iterator */ | |
2012 | struct fib_trie_iter { | |
877a9bff | 2013 | struct trie *trie_local, *trie_main; |
cb7b593c SH |
2014 | struct tnode *tnode; |
2015 | struct trie *trie; | |
2016 | unsigned index; | |
2017 | unsigned depth; | |
2018 | }; | |
19baf839 | 2019 | |
cb7b593c | 2020 | static struct node *fib_trie_get_next(struct fib_trie_iter *iter) |
19baf839 | 2021 | { |
cb7b593c SH |
2022 | struct tnode *tn = iter->tnode; |
2023 | unsigned cindex = iter->index; | |
2024 | struct tnode *p; | |
19baf839 | 2025 | |
6640e697 EB |
2026 | /* A single entry routing table */ |
2027 | if (!tn) | |
2028 | return NULL; | |
2029 | ||
cb7b593c SH |
2030 | pr_debug("get_next iter={node=%p index=%d depth=%d}\n", |
2031 | iter->tnode, iter->index, iter->depth); | |
2032 | rescan: | |
2033 | while (cindex < (1<<tn->bits)) { | |
2034 | struct node *n = tnode_get_child(tn, cindex); | |
19baf839 | 2035 | |
cb7b593c SH |
2036 | if (n) { |
2037 | if (IS_LEAF(n)) { | |
2038 | iter->tnode = tn; | |
2039 | iter->index = cindex + 1; | |
2040 | } else { | |
2041 | /* push down one level */ | |
2042 | iter->tnode = (struct tnode *) n; | |
2043 | iter->index = 0; | |
2044 | ++iter->depth; | |
2045 | } | |
2046 | return n; | |
2047 | } | |
19baf839 | 2048 | |
cb7b593c SH |
2049 | ++cindex; |
2050 | } | |
91b9a277 | 2051 | |
cb7b593c | 2052 | /* Current node exhausted, pop back up */ |
06801916 | 2053 | p = node_parent((struct node *)tn); |
cb7b593c SH |
2054 | if (p) { |
2055 | cindex = tkey_extract_bits(tn->key, p->pos, p->bits)+1; | |
2056 | tn = p; | |
2057 | --iter->depth; | |
2058 | goto rescan; | |
19baf839 | 2059 | } |
cb7b593c SH |
2060 | |
2061 | /* got root? */ | |
2062 | return NULL; | |
19baf839 RO |
2063 | } |
2064 | ||
cb7b593c SH |
2065 | static struct node *fib_trie_get_first(struct fib_trie_iter *iter, |
2066 | struct trie *t) | |
19baf839 | 2067 | { |
5ddf0eb2 RO |
2068 | struct node *n ; |
2069 | ||
132adf54 | 2070 | if (!t) |
5ddf0eb2 RO |
2071 | return NULL; |
2072 | ||
2073 | n = rcu_dereference(t->trie); | |
2074 | ||
132adf54 | 2075 | if (!iter) |
5ddf0eb2 | 2076 | return NULL; |
19baf839 | 2077 | |
6640e697 EB |
2078 | if (n) { |
2079 | if (IS_TNODE(n)) { | |
2080 | iter->tnode = (struct tnode *) n; | |
2081 | iter->trie = t; | |
2082 | iter->index = 0; | |
2083 | iter->depth = 1; | |
2084 | } else { | |
2085 | iter->tnode = NULL; | |
2086 | iter->trie = t; | |
2087 | iter->index = 0; | |
2088 | iter->depth = 0; | |
2089 | } | |
cb7b593c | 2090 | return n; |
91b9a277 | 2091 | } |
cb7b593c SH |
2092 | return NULL; |
2093 | } | |
91b9a277 | 2094 | |
cb7b593c SH |
2095 | static void trie_collect_stats(struct trie *t, struct trie_stat *s) |
2096 | { | |
2097 | struct node *n; | |
2098 | struct fib_trie_iter iter; | |
91b9a277 | 2099 | |
cb7b593c | 2100 | memset(s, 0, sizeof(*s)); |
91b9a277 | 2101 | |
cb7b593c SH |
2102 | rcu_read_lock(); |
2103 | for (n = fib_trie_get_first(&iter, t); n; | |
2104 | n = fib_trie_get_next(&iter)) { | |
2105 | if (IS_LEAF(n)) { | |
2106 | s->leaves++; | |
2107 | s->totdepth += iter.depth; | |
2108 | if (iter.depth > s->maxdepth) | |
2109 | s->maxdepth = iter.depth; | |
2110 | } else { | |
2111 | const struct tnode *tn = (const struct tnode *) n; | |
2112 | int i; | |
2113 | ||
2114 | s->tnodes++; | |
132adf54 | 2115 | if (tn->bits < MAX_STAT_DEPTH) |
06ef921d RO |
2116 | s->nodesizes[tn->bits]++; |
2117 | ||
cb7b593c SH |
2118 | for (i = 0; i < (1<<tn->bits); i++) |
2119 | if (!tn->child[i]) | |
2120 | s->nullpointers++; | |
19baf839 | 2121 | } |
19baf839 | 2122 | } |
2373ce1c | 2123 | rcu_read_unlock(); |
19baf839 RO |
2124 | } |
2125 | ||
cb7b593c SH |
2126 | /* |
2127 | * This outputs /proc/net/fib_triestats | |
2128 | */ | |
2129 | static void trie_show_stats(struct seq_file *seq, struct trie_stat *stat) | |
19baf839 | 2130 | { |
cb7b593c | 2131 | unsigned i, max, pointers, bytes, avdepth; |
c877efb2 | 2132 | |
cb7b593c SH |
2133 | if (stat->leaves) |
2134 | avdepth = stat->totdepth*100 / stat->leaves; | |
2135 | else | |
2136 | avdepth = 0; | |
91b9a277 | 2137 | |
cb7b593c SH |
2138 | seq_printf(seq, "\tAver depth: %d.%02d\n", avdepth / 100, avdepth % 100 ); |
2139 | seq_printf(seq, "\tMax depth: %u\n", stat->maxdepth); | |
91b9a277 | 2140 | |
cb7b593c | 2141 | seq_printf(seq, "\tLeaves: %u\n", stat->leaves); |
91b9a277 | 2142 | |
cb7b593c SH |
2143 | bytes = sizeof(struct leaf) * stat->leaves; |
2144 | seq_printf(seq, "\tInternal nodes: %d\n\t", stat->tnodes); | |
2145 | bytes += sizeof(struct tnode) * stat->tnodes; | |
19baf839 | 2146 | |
06ef921d RO |
2147 | max = MAX_STAT_DEPTH; |
2148 | while (max > 0 && stat->nodesizes[max-1] == 0) | |
cb7b593c | 2149 | max--; |
19baf839 | 2150 | |
cb7b593c SH |
2151 | pointers = 0; |
2152 | for (i = 1; i <= max; i++) | |
2153 | if (stat->nodesizes[i] != 0) { | |
2154 | seq_printf(seq, " %d: %d", i, stat->nodesizes[i]); | |
2155 | pointers += (1<<i) * stat->nodesizes[i]; | |
2156 | } | |
2157 | seq_putc(seq, '\n'); | |
2158 | seq_printf(seq, "\tPointers: %d\n", pointers); | |
2373ce1c | 2159 | |
cb7b593c SH |
2160 | bytes += sizeof(struct node *) * pointers; |
2161 | seq_printf(seq, "Null ptrs: %d\n", stat->nullpointers); | |
2162 | seq_printf(seq, "Total size: %d kB\n", (bytes + 1023) / 1024); | |
2373ce1c | 2163 | |
cb7b593c SH |
2164 | #ifdef CONFIG_IP_FIB_TRIE_STATS |
2165 | seq_printf(seq, "Counters:\n---------\n"); | |
2166 | seq_printf(seq,"gets = %d\n", t->stats.gets); | |
2167 | seq_printf(seq,"backtracks = %d\n", t->stats.backtrack); | |
2168 | seq_printf(seq,"semantic match passed = %d\n", t->stats.semantic_match_passed); | |
2169 | seq_printf(seq,"semantic match miss = %d\n", t->stats.semantic_match_miss); | |
2170 | seq_printf(seq,"null node hit= %d\n", t->stats.null_node_hit); | |
2171 | seq_printf(seq,"skipped node resize = %d\n", t->stats.resize_node_skipped); | |
2172 | #ifdef CLEAR_STATS | |
2173 | memset(&(t->stats), 0, sizeof(t->stats)); | |
2174 | #endif | |
2175 | #endif /* CONFIG_IP_FIB_TRIE_STATS */ | |
2176 | } | |
19baf839 | 2177 | |
cb7b593c SH |
2178 | static int fib_triestat_seq_show(struct seq_file *seq, void *v) |
2179 | { | |
877a9bff | 2180 | struct trie *trie_local, *trie_main; |
cb7b593c | 2181 | struct trie_stat *stat; |
877a9bff EB |
2182 | struct fib_table *tb; |
2183 | ||
2184 | trie_local = NULL; | |
2185 | tb = fib_get_table(RT_TABLE_LOCAL); | |
2186 | if (tb) | |
2187 | trie_local = (struct trie *) tb->tb_data; | |
2188 | ||
2189 | trie_main = NULL; | |
2190 | tb = fib_get_table(RT_TABLE_MAIN); | |
2191 | if (tb) | |
2192 | trie_main = (struct trie *) tb->tb_data; | |
2193 | ||
91b9a277 | 2194 | |
cb7b593c SH |
2195 | stat = kmalloc(sizeof(*stat), GFP_KERNEL); |
2196 | if (!stat) | |
2197 | return -ENOMEM; | |
91b9a277 | 2198 | |
cb7b593c SH |
2199 | seq_printf(seq, "Basic info: size of leaf: %Zd bytes, size of tnode: %Zd bytes.\n", |
2200 | sizeof(struct leaf), sizeof(struct tnode)); | |
91b9a277 | 2201 | |
cb7b593c SH |
2202 | if (trie_local) { |
2203 | seq_printf(seq, "Local:\n"); | |
2204 | trie_collect_stats(trie_local, stat); | |
2205 | trie_show_stats(seq, stat); | |
2206 | } | |
91b9a277 | 2207 | |
cb7b593c SH |
2208 | if (trie_main) { |
2209 | seq_printf(seq, "Main:\n"); | |
2210 | trie_collect_stats(trie_main, stat); | |
2211 | trie_show_stats(seq, stat); | |
19baf839 | 2212 | } |
cb7b593c | 2213 | kfree(stat); |
19baf839 | 2214 | |
cb7b593c | 2215 | return 0; |
19baf839 RO |
2216 | } |
2217 | ||
cb7b593c | 2218 | static int fib_triestat_seq_open(struct inode *inode, struct file *file) |
19baf839 | 2219 | { |
cb7b593c | 2220 | return single_open(file, fib_triestat_seq_show, NULL); |
19baf839 RO |
2221 | } |
2222 | ||
9a32144e | 2223 | static const struct file_operations fib_triestat_fops = { |
cb7b593c SH |
2224 | .owner = THIS_MODULE, |
2225 | .open = fib_triestat_seq_open, | |
2226 | .read = seq_read, | |
2227 | .llseek = seq_lseek, | |
2228 | .release = single_release, | |
2229 | }; | |
2230 | ||
2231 | static struct node *fib_trie_get_idx(struct fib_trie_iter *iter, | |
2232 | loff_t pos) | |
19baf839 | 2233 | { |
cb7b593c SH |
2234 | loff_t idx = 0; |
2235 | struct node *n; | |
2236 | ||
877a9bff | 2237 | for (n = fib_trie_get_first(iter, iter->trie_local); |
cb7b593c SH |
2238 | n; ++idx, n = fib_trie_get_next(iter)) { |
2239 | if (pos == idx) | |
2240 | return n; | |
2241 | } | |
2242 | ||
877a9bff | 2243 | for (n = fib_trie_get_first(iter, iter->trie_main); |
cb7b593c SH |
2244 | n; ++idx, n = fib_trie_get_next(iter)) { |
2245 | if (pos == idx) | |
2246 | return n; | |
2247 | } | |
19baf839 RO |
2248 | return NULL; |
2249 | } | |
2250 | ||
cb7b593c | 2251 | static void *fib_trie_seq_start(struct seq_file *seq, loff_t *pos) |
19baf839 | 2252 | { |
877a9bff EB |
2253 | struct fib_trie_iter *iter = seq->private; |
2254 | struct fib_table *tb; | |
2255 | ||
2256 | if (!iter->trie_local) { | |
2257 | tb = fib_get_table(RT_TABLE_LOCAL); | |
2258 | if (tb) | |
2259 | iter->trie_local = (struct trie *) tb->tb_data; | |
2260 | } | |
2261 | if (!iter->trie_main) { | |
2262 | tb = fib_get_table(RT_TABLE_MAIN); | |
2263 | if (tb) | |
2264 | iter->trie_main = (struct trie *) tb->tb_data; | |
2265 | } | |
cb7b593c SH |
2266 | rcu_read_lock(); |
2267 | if (*pos == 0) | |
91b9a277 | 2268 | return SEQ_START_TOKEN; |
877a9bff | 2269 | return fib_trie_get_idx(iter, *pos - 1); |
19baf839 RO |
2270 | } |
2271 | ||
cb7b593c | 2272 | static void *fib_trie_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
19baf839 | 2273 | { |
cb7b593c SH |
2274 | struct fib_trie_iter *iter = seq->private; |
2275 | void *l = v; | |
2276 | ||
19baf839 | 2277 | ++*pos; |
91b9a277 | 2278 | if (v == SEQ_START_TOKEN) |
cb7b593c | 2279 | return fib_trie_get_idx(iter, 0); |
19baf839 | 2280 | |
cb7b593c SH |
2281 | v = fib_trie_get_next(iter); |
2282 | BUG_ON(v == l); | |
2283 | if (v) | |
2284 | return v; | |
19baf839 | 2285 | |
cb7b593c | 2286 | /* continue scan in next trie */ |
877a9bff EB |
2287 | if (iter->trie == iter->trie_local) |
2288 | return fib_trie_get_first(iter, iter->trie_main); | |
19baf839 | 2289 | |
cb7b593c SH |
2290 | return NULL; |
2291 | } | |
19baf839 | 2292 | |
cb7b593c | 2293 | static void fib_trie_seq_stop(struct seq_file *seq, void *v) |
19baf839 | 2294 | { |
cb7b593c SH |
2295 | rcu_read_unlock(); |
2296 | } | |
91b9a277 | 2297 | |
cb7b593c SH |
2298 | static void seq_indent(struct seq_file *seq, int n) |
2299 | { | |
2300 | while (n-- > 0) seq_puts(seq, " "); | |
2301 | } | |
19baf839 | 2302 | |
cb7b593c SH |
2303 | static inline const char *rtn_scope(enum rt_scope_t s) |
2304 | { | |
2305 | static char buf[32]; | |
19baf839 | 2306 | |
132adf54 | 2307 | switch (s) { |
cb7b593c SH |
2308 | case RT_SCOPE_UNIVERSE: return "universe"; |
2309 | case RT_SCOPE_SITE: return "site"; | |
2310 | case RT_SCOPE_LINK: return "link"; | |
2311 | case RT_SCOPE_HOST: return "host"; | |
2312 | case RT_SCOPE_NOWHERE: return "nowhere"; | |
2313 | default: | |
2314 | snprintf(buf, sizeof(buf), "scope=%d", s); | |
2315 | return buf; | |
2316 | } | |
2317 | } | |
19baf839 | 2318 | |
cb7b593c SH |
2319 | static const char *rtn_type_names[__RTN_MAX] = { |
2320 | [RTN_UNSPEC] = "UNSPEC", | |
2321 | [RTN_UNICAST] = "UNICAST", | |
2322 | [RTN_LOCAL] = "LOCAL", | |
2323 | [RTN_BROADCAST] = "BROADCAST", | |
2324 | [RTN_ANYCAST] = "ANYCAST", | |
2325 | [RTN_MULTICAST] = "MULTICAST", | |
2326 | [RTN_BLACKHOLE] = "BLACKHOLE", | |
2327 | [RTN_UNREACHABLE] = "UNREACHABLE", | |
2328 | [RTN_PROHIBIT] = "PROHIBIT", | |
2329 | [RTN_THROW] = "THROW", | |
2330 | [RTN_NAT] = "NAT", | |
2331 | [RTN_XRESOLVE] = "XRESOLVE", | |
2332 | }; | |
19baf839 | 2333 | |
cb7b593c SH |
2334 | static inline const char *rtn_type(unsigned t) |
2335 | { | |
2336 | static char buf[32]; | |
19baf839 | 2337 | |
cb7b593c SH |
2338 | if (t < __RTN_MAX && rtn_type_names[t]) |
2339 | return rtn_type_names[t]; | |
2340 | snprintf(buf, sizeof(buf), "type %d", t); | |
2341 | return buf; | |
19baf839 RO |
2342 | } |
2343 | ||
cb7b593c SH |
2344 | /* Pretty print the trie */ |
2345 | static int fib_trie_seq_show(struct seq_file *seq, void *v) | |
19baf839 | 2346 | { |
cb7b593c SH |
2347 | const struct fib_trie_iter *iter = seq->private; |
2348 | struct node *n = v; | |
c877efb2 | 2349 | |
cb7b593c SH |
2350 | if (v == SEQ_START_TOKEN) |
2351 | return 0; | |
19baf839 | 2352 | |
06801916 | 2353 | if (!node_parent(n)) { |
877a9bff | 2354 | if (iter->trie == iter->trie_local) |
095b8501 RO |
2355 | seq_puts(seq, "<local>:\n"); |
2356 | else | |
2357 | seq_puts(seq, "<main>:\n"); | |
2358 | } | |
2359 | ||
cb7b593c SH |
2360 | if (IS_TNODE(n)) { |
2361 | struct tnode *tn = (struct tnode *) n; | |
ab66b4a7 | 2362 | __be32 prf = htonl(mask_pfx(tn->key, tn->pos)); |
91b9a277 | 2363 | |
1d25cd6c RO |
2364 | seq_indent(seq, iter->depth-1); |
2365 | seq_printf(seq, " +-- %d.%d.%d.%d/%d %d %d %d\n", | |
e905a9ed | 2366 | NIPQUAD(prf), tn->pos, tn->bits, tn->full_children, |
1d25cd6c | 2367 | tn->empty_children); |
e905a9ed | 2368 | |
cb7b593c SH |
2369 | } else { |
2370 | struct leaf *l = (struct leaf *) n; | |
2371 | int i; | |
32ab5f80 | 2372 | __be32 val = htonl(l->key); |
cb7b593c SH |
2373 | |
2374 | seq_indent(seq, iter->depth); | |
2375 | seq_printf(seq, " |-- %d.%d.%d.%d\n", NIPQUAD(val)); | |
2376 | for (i = 32; i >= 0; i--) { | |
772cb712 | 2377 | struct leaf_info *li = find_leaf_info(l, i); |
cb7b593c SH |
2378 | if (li) { |
2379 | struct fib_alias *fa; | |
2380 | list_for_each_entry_rcu(fa, &li->falh, fa_list) { | |
2381 | seq_indent(seq, iter->depth+1); | |
2382 | seq_printf(seq, " /%d %s %s", i, | |
2383 | rtn_scope(fa->fa_scope), | |
2384 | rtn_type(fa->fa_type)); | |
2385 | if (fa->fa_tos) | |
2386 | seq_printf(seq, "tos =%d\n", | |
2387 | fa->fa_tos); | |
2388 | seq_putc(seq, '\n'); | |
2389 | } | |
2390 | } | |
2391 | } | |
19baf839 | 2392 | } |
cb7b593c | 2393 | |
19baf839 RO |
2394 | return 0; |
2395 | } | |
2396 | ||
f690808e | 2397 | static const struct seq_operations fib_trie_seq_ops = { |
cb7b593c SH |
2398 | .start = fib_trie_seq_start, |
2399 | .next = fib_trie_seq_next, | |
2400 | .stop = fib_trie_seq_stop, | |
2401 | .show = fib_trie_seq_show, | |
19baf839 RO |
2402 | }; |
2403 | ||
cb7b593c | 2404 | static int fib_trie_seq_open(struct inode *inode, struct file *file) |
19baf839 | 2405 | { |
cf7732e4 PE |
2406 | return seq_open_private(file, &fib_trie_seq_ops, |
2407 | sizeof(struct fib_trie_iter)); | |
19baf839 RO |
2408 | } |
2409 | ||
9a32144e | 2410 | static const struct file_operations fib_trie_fops = { |
cb7b593c SH |
2411 | .owner = THIS_MODULE, |
2412 | .open = fib_trie_seq_open, | |
2413 | .read = seq_read, | |
2414 | .llseek = seq_lseek, | |
c877efb2 | 2415 | .release = seq_release_private, |
19baf839 RO |
2416 | }; |
2417 | ||
32ab5f80 | 2418 | static unsigned fib_flag_trans(int type, __be32 mask, const struct fib_info *fi) |
19baf839 | 2419 | { |
cb7b593c SH |
2420 | static unsigned type2flags[RTN_MAX + 1] = { |
2421 | [7] = RTF_REJECT, [8] = RTF_REJECT, | |
2422 | }; | |
2423 | unsigned flags = type2flags[type]; | |
19baf839 | 2424 | |
cb7b593c SH |
2425 | if (fi && fi->fib_nh->nh_gw) |
2426 | flags |= RTF_GATEWAY; | |
32ab5f80 | 2427 | if (mask == htonl(0xFFFFFFFF)) |
cb7b593c SH |
2428 | flags |= RTF_HOST; |
2429 | flags |= RTF_UP; | |
2430 | return flags; | |
19baf839 RO |
2431 | } |
2432 | ||
cb7b593c SH |
2433 | /* |
2434 | * This outputs /proc/net/route. | |
2435 | * The format of the file is not supposed to be changed | |
2436 | * and needs to be same as fib_hash output to avoid breaking | |
2437 | * legacy utilities | |
2438 | */ | |
2439 | static int fib_route_seq_show(struct seq_file *seq, void *v) | |
19baf839 | 2440 | { |
c9e53cbe | 2441 | const struct fib_trie_iter *iter = seq->private; |
cb7b593c SH |
2442 | struct leaf *l = v; |
2443 | int i; | |
2444 | char bf[128]; | |
19baf839 | 2445 | |
cb7b593c SH |
2446 | if (v == SEQ_START_TOKEN) { |
2447 | seq_printf(seq, "%-127s\n", "Iface\tDestination\tGateway " | |
2448 | "\tFlags\tRefCnt\tUse\tMetric\tMask\t\tMTU" | |
2449 | "\tWindow\tIRTT"); | |
2450 | return 0; | |
2451 | } | |
19baf839 | 2452 | |
877a9bff | 2453 | if (iter->trie == iter->trie_local) |
c9e53cbe | 2454 | return 0; |
cb7b593c SH |
2455 | if (IS_TNODE(l)) |
2456 | return 0; | |
19baf839 | 2457 | |
cb7b593c | 2458 | for (i=32; i>=0; i--) { |
772cb712 | 2459 | struct leaf_info *li = find_leaf_info(l, i); |
cb7b593c | 2460 | struct fib_alias *fa; |
32ab5f80 | 2461 | __be32 mask, prefix; |
91b9a277 | 2462 | |
cb7b593c SH |
2463 | if (!li) |
2464 | continue; | |
19baf839 | 2465 | |
cb7b593c SH |
2466 | mask = inet_make_mask(li->plen); |
2467 | prefix = htonl(l->key); | |
19baf839 | 2468 | |
cb7b593c | 2469 | list_for_each_entry_rcu(fa, &li->falh, fa_list) { |
1371e37d | 2470 | const struct fib_info *fi = fa->fa_info; |
cb7b593c | 2471 | unsigned flags = fib_flag_trans(fa->fa_type, mask, fi); |
19baf839 | 2472 | |
cb7b593c SH |
2473 | if (fa->fa_type == RTN_BROADCAST |
2474 | || fa->fa_type == RTN_MULTICAST) | |
2475 | continue; | |
19baf839 | 2476 | |
cb7b593c SH |
2477 | if (fi) |
2478 | snprintf(bf, sizeof(bf), | |
2479 | "%s\t%08X\t%08X\t%04X\t%d\t%u\t%d\t%08X\t%d\t%u\t%u", | |
2480 | fi->fib_dev ? fi->fib_dev->name : "*", | |
2481 | prefix, | |
2482 | fi->fib_nh->nh_gw, flags, 0, 0, | |
2483 | fi->fib_priority, | |
2484 | mask, | |
2485 | (fi->fib_advmss ? fi->fib_advmss + 40 : 0), | |
2486 | fi->fib_window, | |
2487 | fi->fib_rtt >> 3); | |
2488 | else | |
2489 | snprintf(bf, sizeof(bf), | |
2490 | "*\t%08X\t%08X\t%04X\t%d\t%u\t%d\t%08X\t%d\t%u\t%u", | |
2491 | prefix, 0, flags, 0, 0, 0, | |
2492 | mask, 0, 0, 0); | |
19baf839 | 2493 | |
cb7b593c SH |
2494 | seq_printf(seq, "%-127s\n", bf); |
2495 | } | |
19baf839 RO |
2496 | } |
2497 | ||
2498 | return 0; | |
2499 | } | |
2500 | ||
f690808e | 2501 | static const struct seq_operations fib_route_seq_ops = { |
cb7b593c SH |
2502 | .start = fib_trie_seq_start, |
2503 | .next = fib_trie_seq_next, | |
2504 | .stop = fib_trie_seq_stop, | |
2505 | .show = fib_route_seq_show, | |
19baf839 RO |
2506 | }; |
2507 | ||
cb7b593c | 2508 | static int fib_route_seq_open(struct inode *inode, struct file *file) |
19baf839 | 2509 | { |
cf7732e4 PE |
2510 | return seq_open_private(file, &fib_route_seq_ops, |
2511 | sizeof(struct fib_trie_iter)); | |
19baf839 RO |
2512 | } |
2513 | ||
9a32144e | 2514 | static const struct file_operations fib_route_fops = { |
cb7b593c SH |
2515 | .owner = THIS_MODULE, |
2516 | .open = fib_route_seq_open, | |
2517 | .read = seq_read, | |
2518 | .llseek = seq_lseek, | |
2519 | .release = seq_release_private, | |
19baf839 RO |
2520 | }; |
2521 | ||
2522 | int __init fib_proc_init(void) | |
2523 | { | |
457c4cbc | 2524 | if (!proc_net_fops_create(&init_net, "fib_trie", S_IRUGO, &fib_trie_fops)) |
cb7b593c SH |
2525 | goto out1; |
2526 | ||
457c4cbc | 2527 | if (!proc_net_fops_create(&init_net, "fib_triestat", S_IRUGO, &fib_triestat_fops)) |
cb7b593c SH |
2528 | goto out2; |
2529 | ||
457c4cbc | 2530 | if (!proc_net_fops_create(&init_net, "route", S_IRUGO, &fib_route_fops)) |
cb7b593c SH |
2531 | goto out3; |
2532 | ||
19baf839 | 2533 | return 0; |
cb7b593c SH |
2534 | |
2535 | out3: | |
457c4cbc | 2536 | proc_net_remove(&init_net, "fib_triestat"); |
cb7b593c | 2537 | out2: |
457c4cbc | 2538 | proc_net_remove(&init_net, "fib_trie"); |
cb7b593c SH |
2539 | out1: |
2540 | return -ENOMEM; | |
19baf839 RO |
2541 | } |
2542 | ||
2543 | void __init fib_proc_exit(void) | |
2544 | { | |
457c4cbc EB |
2545 | proc_net_remove(&init_net, "fib_trie"); |
2546 | proc_net_remove(&init_net, "fib_triestat"); | |
2547 | proc_net_remove(&init_net, "route"); | |
19baf839 RO |
2548 | } |
2549 | ||
2550 | #endif /* CONFIG_PROC_FS */ |