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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 | * | |
10 | * Jens Laas <jens.laas@data.slu.se> Swedish University of | |
11 | * Agricultural Sciences. | |
12 | * | |
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: | |
16 | * | |
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. | |
44 | */ | |
45 | ||
772cb712 | 46 | #define VERSION "0.404" |
19baf839 RO |
47 | |
48 | #include <linux/config.h> | |
49 | #include <asm/uaccess.h> | |
50 | #include <asm/system.h> | |
51 | #include <asm/bitops.h> | |
52 | #include <linux/types.h> | |
53 | #include <linux/kernel.h> | |
54 | #include <linux/sched.h> | |
55 | #include <linux/mm.h> | |
56 | #include <linux/string.h> | |
57 | #include <linux/socket.h> | |
58 | #include <linux/sockios.h> | |
59 | #include <linux/errno.h> | |
60 | #include <linux/in.h> | |
61 | #include <linux/inet.h> | |
62 | #include <linux/netdevice.h> | |
63 | #include <linux/if_arp.h> | |
64 | #include <linux/proc_fs.h> | |
2373ce1c | 65 | #include <linux/rcupdate.h> |
19baf839 RO |
66 | #include <linux/skbuff.h> |
67 | #include <linux/netlink.h> | |
68 | #include <linux/init.h> | |
69 | #include <linux/list.h> | |
70 | #include <net/ip.h> | |
71 | #include <net/protocol.h> | |
72 | #include <net/route.h> | |
73 | #include <net/tcp.h> | |
74 | #include <net/sock.h> | |
75 | #include <net/ip_fib.h> | |
76 | #include "fib_lookup.h" | |
77 | ||
78 | #undef CONFIG_IP_FIB_TRIE_STATS | |
79 | #define MAX_CHILDS 16384 | |
80 | ||
19baf839 RO |
81 | #define KEYLENGTH (8*sizeof(t_key)) |
82 | #define MASK_PFX(k, l) (((l)==0)?0:(k >> (KEYLENGTH-l)) << (KEYLENGTH-l)) | |
83 | #define TKEY_GET_MASK(offset, bits) (((bits)==0)?0:((t_key)(-1) << (KEYLENGTH - bits) >> offset)) | |
84 | ||
19baf839 RO |
85 | typedef unsigned int t_key; |
86 | ||
87 | #define T_TNODE 0 | |
88 | #define T_LEAF 1 | |
89 | #define NODE_TYPE_MASK 0x1UL | |
91b9a277 | 90 | #define NODE_PARENT(node) \ |
2373ce1c RO |
91 | ((struct tnode *)rcu_dereference(((node)->parent & ~NODE_TYPE_MASK))) |
92 | ||
93 | #define NODE_TYPE(node) ((node)->parent & NODE_TYPE_MASK) | |
94 | ||
95 | #define NODE_SET_PARENT(node, ptr) \ | |
96 | rcu_assign_pointer((node)->parent, \ | |
97 | ((unsigned long)(ptr)) | NODE_TYPE(node)) | |
91b9a277 OJ |
98 | |
99 | #define IS_TNODE(n) (!(n->parent & T_LEAF)) | |
100 | #define IS_LEAF(n) (n->parent & T_LEAF) | |
19baf839 RO |
101 | |
102 | struct node { | |
91b9a277 OJ |
103 | t_key key; |
104 | unsigned long parent; | |
19baf839 RO |
105 | }; |
106 | ||
107 | struct leaf { | |
91b9a277 OJ |
108 | t_key key; |
109 | unsigned long parent; | |
19baf839 | 110 | struct hlist_head list; |
2373ce1c | 111 | struct rcu_head rcu; |
19baf839 RO |
112 | }; |
113 | ||
114 | struct leaf_info { | |
115 | struct hlist_node hlist; | |
2373ce1c | 116 | struct rcu_head rcu; |
19baf839 RO |
117 | int plen; |
118 | struct list_head falh; | |
119 | }; | |
120 | ||
121 | struct tnode { | |
91b9a277 OJ |
122 | t_key key; |
123 | unsigned long parent; | |
124 | unsigned short pos:5; /* 2log(KEYLENGTH) bits needed */ | |
125 | unsigned short bits:5; /* 2log(KEYLENGTH) bits needed */ | |
126 | unsigned short full_children; /* KEYLENGTH bits needed */ | |
127 | unsigned short empty_children; /* KEYLENGTH bits needed */ | |
2373ce1c | 128 | struct rcu_head rcu; |
91b9a277 | 129 | struct node *child[0]; |
19baf839 RO |
130 | }; |
131 | ||
132 | #ifdef CONFIG_IP_FIB_TRIE_STATS | |
133 | struct trie_use_stats { | |
134 | unsigned int gets; | |
135 | unsigned int backtrack; | |
136 | unsigned int semantic_match_passed; | |
137 | unsigned int semantic_match_miss; | |
138 | unsigned int null_node_hit; | |
2f36895a | 139 | unsigned int resize_node_skipped; |
19baf839 RO |
140 | }; |
141 | #endif | |
142 | ||
143 | struct trie_stat { | |
144 | unsigned int totdepth; | |
145 | unsigned int maxdepth; | |
146 | unsigned int tnodes; | |
147 | unsigned int leaves; | |
148 | unsigned int nullpointers; | |
149 | unsigned int nodesizes[MAX_CHILDS]; | |
c877efb2 | 150 | }; |
19baf839 RO |
151 | |
152 | struct trie { | |
91b9a277 | 153 | struct node *trie; |
19baf839 RO |
154 | #ifdef CONFIG_IP_FIB_TRIE_STATS |
155 | struct trie_use_stats stats; | |
156 | #endif | |
91b9a277 | 157 | int size; |
19baf839 RO |
158 | unsigned int revision; |
159 | }; | |
160 | ||
19baf839 RO |
161 | static void put_child(struct trie *t, struct tnode *tn, int i, struct node *n); |
162 | static void tnode_put_child_reorg(struct tnode *tn, int i, struct node *n, int wasfull); | |
19baf839 | 163 | static struct node *resize(struct trie *t, struct tnode *tn); |
2f80b3c8 RO |
164 | static struct tnode *inflate(struct trie *t, struct tnode *tn); |
165 | static struct tnode *halve(struct trie *t, struct tnode *tn); | |
19baf839 | 166 | static void tnode_free(struct tnode *tn); |
19baf839 | 167 | |
ba89966c | 168 | static kmem_cache_t *fn_alias_kmem __read_mostly; |
19baf839 RO |
169 | static struct trie *trie_local = NULL, *trie_main = NULL; |
170 | ||
2373ce1c RO |
171 | |
172 | /* rcu_read_lock needs to be hold by caller from readside */ | |
173 | ||
c877efb2 | 174 | static inline struct node *tnode_get_child(struct tnode *tn, int i) |
19baf839 | 175 | { |
91b9a277 | 176 | BUG_ON(i >= 1 << tn->bits); |
19baf839 | 177 | |
2373ce1c | 178 | return rcu_dereference(tn->child[i]); |
19baf839 RO |
179 | } |
180 | ||
bb435b8d | 181 | static inline int tnode_child_length(const struct tnode *tn) |
19baf839 | 182 | { |
91b9a277 | 183 | return 1 << tn->bits; |
19baf839 RO |
184 | } |
185 | ||
19baf839 RO |
186 | static inline t_key tkey_extract_bits(t_key a, int offset, int bits) |
187 | { | |
91b9a277 | 188 | if (offset < KEYLENGTH) |
19baf839 | 189 | return ((t_key)(a << offset)) >> (KEYLENGTH - bits); |
91b9a277 | 190 | else |
19baf839 RO |
191 | return 0; |
192 | } | |
193 | ||
194 | static inline int tkey_equals(t_key a, t_key b) | |
195 | { | |
c877efb2 | 196 | return a == b; |
19baf839 RO |
197 | } |
198 | ||
199 | static inline int tkey_sub_equals(t_key a, int offset, int bits, t_key b) | |
200 | { | |
c877efb2 SH |
201 | if (bits == 0 || offset >= KEYLENGTH) |
202 | return 1; | |
91b9a277 OJ |
203 | bits = bits > KEYLENGTH ? KEYLENGTH : bits; |
204 | return ((a ^ b) << offset) >> (KEYLENGTH - bits) == 0; | |
c877efb2 | 205 | } |
19baf839 RO |
206 | |
207 | static inline int tkey_mismatch(t_key a, int offset, t_key b) | |
208 | { | |
209 | t_key diff = a ^ b; | |
210 | int i = offset; | |
211 | ||
c877efb2 SH |
212 | if (!diff) |
213 | return 0; | |
214 | while ((diff << i) >> (KEYLENGTH-1) == 0) | |
19baf839 RO |
215 | i++; |
216 | return i; | |
217 | } | |
218 | ||
19baf839 RO |
219 | /* |
220 | To understand this stuff, an understanding of keys and all their bits is | |
221 | necessary. Every node in the trie has a key associated with it, but not | |
222 | all of the bits in that key are significant. | |
223 | ||
224 | Consider a node 'n' and its parent 'tp'. | |
225 | ||
226 | If n is a leaf, every bit in its key is significant. Its presence is | |
772cb712 | 227 | necessitated by path compression, since during a tree traversal (when |
19baf839 RO |
228 | searching for a leaf - unless we are doing an insertion) we will completely |
229 | ignore all skipped bits we encounter. Thus we need to verify, at the end of | |
230 | a potentially successful search, that we have indeed been walking the | |
231 | correct key path. | |
232 | ||
233 | Note that we can never "miss" the correct key in the tree if present by | |
234 | following the wrong path. Path compression ensures that segments of the key | |
235 | that are the same for all keys with a given prefix are skipped, but the | |
236 | skipped part *is* identical for each node in the subtrie below the skipped | |
237 | bit! trie_insert() in this implementation takes care of that - note the | |
238 | call to tkey_sub_equals() in trie_insert(). | |
239 | ||
240 | if n is an internal node - a 'tnode' here, the various parts of its key | |
241 | have many different meanings. | |
242 | ||
243 | Example: | |
244 | _________________________________________________________________ | |
245 | | i | i | i | i | i | i | i | N | N | N | S | S | S | S | S | C | | |
246 | ----------------------------------------------------------------- | |
247 | 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 | |
248 | ||
249 | _________________________________________________________________ | |
250 | | C | C | C | u | u | u | u | u | u | u | u | u | u | u | u | u | | |
251 | ----------------------------------------------------------------- | |
252 | 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 | |
253 | ||
254 | tp->pos = 7 | |
255 | tp->bits = 3 | |
256 | n->pos = 15 | |
91b9a277 | 257 | n->bits = 4 |
19baf839 RO |
258 | |
259 | First, let's just ignore the bits that come before the parent tp, that is | |
260 | the bits from 0 to (tp->pos-1). They are *known* but at this point we do | |
261 | not use them for anything. | |
262 | ||
263 | The bits from (tp->pos) to (tp->pos + tp->bits - 1) - "N", above - are the | |
264 | index into the parent's child array. That is, they will be used to find | |
265 | 'n' among tp's children. | |
266 | ||
267 | The bits from (tp->pos + tp->bits) to (n->pos - 1) - "S" - are skipped bits | |
268 | for the node n. | |
269 | ||
270 | All the bits we have seen so far are significant to the node n. The rest | |
271 | of the bits are really not needed or indeed known in n->key. | |
272 | ||
273 | The bits from (n->pos) to (n->pos + n->bits - 1) - "C" - are the index into | |
274 | n's child array, and will of course be different for each child. | |
275 | ||
c877efb2 | 276 | |
19baf839 RO |
277 | The rest of the bits, from (n->pos + n->bits) onward, are completely unknown |
278 | at this point. | |
279 | ||
280 | */ | |
281 | ||
0c7770c7 | 282 | static inline void check_tnode(const struct tnode *tn) |
19baf839 | 283 | { |
0c7770c7 | 284 | WARN_ON(tn && tn->pos+tn->bits > 32); |
19baf839 RO |
285 | } |
286 | ||
287 | static int halve_threshold = 25; | |
288 | static int inflate_threshold = 50; | |
e6308be8 RO |
289 | static int halve_threshold_root = 15; |
290 | static int inflate_threshold_root = 25; | |
19baf839 | 291 | |
2373ce1c RO |
292 | |
293 | static void __alias_free_mem(struct rcu_head *head) | |
19baf839 | 294 | { |
2373ce1c RO |
295 | struct fib_alias *fa = container_of(head, struct fib_alias, rcu); |
296 | kmem_cache_free(fn_alias_kmem, fa); | |
19baf839 RO |
297 | } |
298 | ||
2373ce1c | 299 | static inline void alias_free_mem_rcu(struct fib_alias *fa) |
19baf839 | 300 | { |
2373ce1c RO |
301 | call_rcu(&fa->rcu, __alias_free_mem); |
302 | } | |
91b9a277 | 303 | |
2373ce1c RO |
304 | static void __leaf_free_rcu(struct rcu_head *head) |
305 | { | |
306 | kfree(container_of(head, struct leaf, rcu)); | |
307 | } | |
91b9a277 | 308 | |
2373ce1c RO |
309 | static inline void free_leaf(struct leaf *leaf) |
310 | { | |
311 | call_rcu(&leaf->rcu, __leaf_free_rcu); | |
19baf839 RO |
312 | } |
313 | ||
2373ce1c | 314 | static void __leaf_info_free_rcu(struct rcu_head *head) |
19baf839 | 315 | { |
2373ce1c | 316 | kfree(container_of(head, struct leaf_info, rcu)); |
19baf839 RO |
317 | } |
318 | ||
2373ce1c | 319 | static inline void free_leaf_info(struct leaf_info *leaf) |
19baf839 | 320 | { |
2373ce1c | 321 | call_rcu(&leaf->rcu, __leaf_info_free_rcu); |
19baf839 RO |
322 | } |
323 | ||
f0e36f8c PM |
324 | static struct tnode *tnode_alloc(unsigned int size) |
325 | { | |
2373ce1c RO |
326 | struct page *pages; |
327 | ||
328 | if (size <= PAGE_SIZE) | |
329 | return kcalloc(size, 1, GFP_KERNEL); | |
330 | ||
331 | pages = alloc_pages(GFP_KERNEL|__GFP_ZERO, get_order(size)); | |
332 | if (!pages) | |
333 | return NULL; | |
334 | ||
335 | return page_address(pages); | |
f0e36f8c PM |
336 | } |
337 | ||
2373ce1c | 338 | static void __tnode_free_rcu(struct rcu_head *head) |
f0e36f8c | 339 | { |
2373ce1c | 340 | struct tnode *tn = container_of(head, struct tnode, rcu); |
f0e36f8c | 341 | unsigned int size = sizeof(struct tnode) + |
2373ce1c | 342 | (1 << tn->bits) * sizeof(struct node *); |
f0e36f8c PM |
343 | |
344 | if (size <= PAGE_SIZE) | |
345 | kfree(tn); | |
346 | else | |
347 | free_pages((unsigned long)tn, get_order(size)); | |
348 | } | |
349 | ||
2373ce1c RO |
350 | static inline void tnode_free(struct tnode *tn) |
351 | { | |
352 | call_rcu(&tn->rcu, __tnode_free_rcu); | |
353 | } | |
354 | ||
355 | static struct leaf *leaf_new(void) | |
356 | { | |
357 | struct leaf *l = kmalloc(sizeof(struct leaf), GFP_KERNEL); | |
358 | if (l) { | |
359 | l->parent = T_LEAF; | |
360 | INIT_HLIST_HEAD(&l->list); | |
361 | } | |
362 | return l; | |
363 | } | |
364 | ||
365 | static struct leaf_info *leaf_info_new(int plen) | |
366 | { | |
367 | struct leaf_info *li = kmalloc(sizeof(struct leaf_info), GFP_KERNEL); | |
368 | if (li) { | |
369 | li->plen = plen; | |
370 | INIT_LIST_HEAD(&li->falh); | |
371 | } | |
372 | return li; | |
373 | } | |
374 | ||
19baf839 RO |
375 | static struct tnode* tnode_new(t_key key, int pos, int bits) |
376 | { | |
377 | int nchildren = 1<<bits; | |
378 | int sz = sizeof(struct tnode) + nchildren * sizeof(struct node *); | |
f0e36f8c | 379 | struct tnode *tn = tnode_alloc(sz); |
19baf839 | 380 | |
91b9a277 | 381 | if (tn) { |
19baf839 | 382 | memset(tn, 0, sz); |
2373ce1c | 383 | tn->parent = T_TNODE; |
19baf839 RO |
384 | tn->pos = pos; |
385 | tn->bits = bits; | |
386 | tn->key = key; | |
387 | tn->full_children = 0; | |
388 | tn->empty_children = 1<<bits; | |
389 | } | |
c877efb2 | 390 | |
0c7770c7 SH |
391 | pr_debug("AT %p s=%u %u\n", tn, (unsigned int) sizeof(struct tnode), |
392 | (unsigned int) (sizeof(struct node) * 1<<bits)); | |
19baf839 RO |
393 | return tn; |
394 | } | |
395 | ||
19baf839 RO |
396 | /* |
397 | * Check whether a tnode 'n' is "full", i.e. it is an internal node | |
398 | * and no bits are skipped. See discussion in dyntree paper p. 6 | |
399 | */ | |
400 | ||
bb435b8d | 401 | static inline int tnode_full(const struct tnode *tn, const struct node *n) |
19baf839 | 402 | { |
c877efb2 | 403 | if (n == NULL || IS_LEAF(n)) |
19baf839 RO |
404 | return 0; |
405 | ||
406 | return ((struct tnode *) n)->pos == tn->pos + tn->bits; | |
407 | } | |
408 | ||
c877efb2 | 409 | static inline void put_child(struct trie *t, struct tnode *tn, int i, struct node *n) |
19baf839 RO |
410 | { |
411 | tnode_put_child_reorg(tn, i, n, -1); | |
412 | } | |
413 | ||
c877efb2 | 414 | /* |
19baf839 RO |
415 | * Add a child at position i overwriting the old value. |
416 | * Update the value of full_children and empty_children. | |
417 | */ | |
418 | ||
c877efb2 | 419 | static void tnode_put_child_reorg(struct tnode *tn, int i, struct node *n, int wasfull) |
19baf839 | 420 | { |
2373ce1c | 421 | struct node *chi = tn->child[i]; |
19baf839 RO |
422 | int isfull; |
423 | ||
0c7770c7 SH |
424 | BUG_ON(i >= 1<<tn->bits); |
425 | ||
19baf839 RO |
426 | |
427 | /* update emptyChildren */ | |
428 | if (n == NULL && chi != NULL) | |
429 | tn->empty_children++; | |
430 | else if (n != NULL && chi == NULL) | |
431 | tn->empty_children--; | |
c877efb2 | 432 | |
19baf839 | 433 | /* update fullChildren */ |
91b9a277 | 434 | if (wasfull == -1) |
19baf839 RO |
435 | wasfull = tnode_full(tn, chi); |
436 | ||
437 | isfull = tnode_full(tn, n); | |
c877efb2 | 438 | if (wasfull && !isfull) |
19baf839 | 439 | tn->full_children--; |
c877efb2 | 440 | else if (!wasfull && isfull) |
19baf839 | 441 | tn->full_children++; |
91b9a277 | 442 | |
c877efb2 SH |
443 | if (n) |
444 | NODE_SET_PARENT(n, tn); | |
19baf839 | 445 | |
2373ce1c | 446 | rcu_assign_pointer(tn->child[i], n); |
19baf839 RO |
447 | } |
448 | ||
c877efb2 | 449 | static struct node *resize(struct trie *t, struct tnode *tn) |
19baf839 RO |
450 | { |
451 | int i; | |
2f36895a | 452 | int err = 0; |
2f80b3c8 | 453 | struct tnode *old_tn; |
e6308be8 RO |
454 | int inflate_threshold_use; |
455 | int halve_threshold_use; | |
19baf839 RO |
456 | |
457 | if (!tn) | |
458 | return NULL; | |
459 | ||
0c7770c7 SH |
460 | pr_debug("In tnode_resize %p inflate_threshold=%d threshold=%d\n", |
461 | tn, inflate_threshold, halve_threshold); | |
19baf839 RO |
462 | |
463 | /* No children */ | |
464 | if (tn->empty_children == tnode_child_length(tn)) { | |
465 | tnode_free(tn); | |
466 | return NULL; | |
467 | } | |
468 | /* One child */ | |
469 | if (tn->empty_children == tnode_child_length(tn) - 1) | |
470 | for (i = 0; i < tnode_child_length(tn); i++) { | |
91b9a277 | 471 | struct node *n; |
19baf839 | 472 | |
91b9a277 | 473 | n = tn->child[i]; |
2373ce1c | 474 | if (!n) |
91b9a277 | 475 | continue; |
91b9a277 OJ |
476 | |
477 | /* compress one level */ | |
2373ce1c | 478 | NODE_SET_PARENT(n, NULL); |
91b9a277 OJ |
479 | tnode_free(tn); |
480 | return n; | |
19baf839 | 481 | } |
c877efb2 | 482 | /* |
19baf839 RO |
483 | * Double as long as the resulting node has a number of |
484 | * nonempty nodes that are above the threshold. | |
485 | */ | |
486 | ||
487 | /* | |
c877efb2 SH |
488 | * From "Implementing a dynamic compressed trie" by Stefan Nilsson of |
489 | * the Helsinki University of Technology and Matti Tikkanen of Nokia | |
19baf839 | 490 | * Telecommunications, page 6: |
c877efb2 | 491 | * "A node is doubled if the ratio of non-empty children to all |
19baf839 RO |
492 | * children in the *doubled* node is at least 'high'." |
493 | * | |
c877efb2 SH |
494 | * 'high' in this instance is the variable 'inflate_threshold'. It |
495 | * is expressed as a percentage, so we multiply it with | |
496 | * tnode_child_length() and instead of multiplying by 2 (since the | |
497 | * child array will be doubled by inflate()) and multiplying | |
498 | * the left-hand side by 100 (to handle the percentage thing) we | |
19baf839 | 499 | * multiply the left-hand side by 50. |
c877efb2 SH |
500 | * |
501 | * The left-hand side may look a bit weird: tnode_child_length(tn) | |
502 | * - tn->empty_children is of course the number of non-null children | |
503 | * in the current node. tn->full_children is the number of "full" | |
19baf839 | 504 | * children, that is non-null tnodes with a skip value of 0. |
c877efb2 | 505 | * All of those will be doubled in the resulting inflated tnode, so |
19baf839 | 506 | * we just count them one extra time here. |
c877efb2 | 507 | * |
19baf839 | 508 | * A clearer way to write this would be: |
c877efb2 | 509 | * |
19baf839 | 510 | * to_be_doubled = tn->full_children; |
c877efb2 | 511 | * not_to_be_doubled = tnode_child_length(tn) - tn->empty_children - |
19baf839 RO |
512 | * tn->full_children; |
513 | * | |
514 | * new_child_length = tnode_child_length(tn) * 2; | |
515 | * | |
c877efb2 | 516 | * new_fill_factor = 100 * (not_to_be_doubled + 2*to_be_doubled) / |
19baf839 RO |
517 | * new_child_length; |
518 | * if (new_fill_factor >= inflate_threshold) | |
c877efb2 SH |
519 | * |
520 | * ...and so on, tho it would mess up the while () loop. | |
521 | * | |
19baf839 RO |
522 | * anyway, |
523 | * 100 * (not_to_be_doubled + 2*to_be_doubled) / new_child_length >= | |
524 | * inflate_threshold | |
c877efb2 | 525 | * |
19baf839 RO |
526 | * avoid a division: |
527 | * 100 * (not_to_be_doubled + 2*to_be_doubled) >= | |
528 | * inflate_threshold * new_child_length | |
c877efb2 | 529 | * |
19baf839 | 530 | * expand not_to_be_doubled and to_be_doubled, and shorten: |
c877efb2 | 531 | * 100 * (tnode_child_length(tn) - tn->empty_children + |
91b9a277 | 532 | * tn->full_children) >= inflate_threshold * new_child_length |
c877efb2 | 533 | * |
19baf839 | 534 | * expand new_child_length: |
c877efb2 | 535 | * 100 * (tnode_child_length(tn) - tn->empty_children + |
91b9a277 | 536 | * tn->full_children) >= |
19baf839 | 537 | * inflate_threshold * tnode_child_length(tn) * 2 |
c877efb2 | 538 | * |
19baf839 | 539 | * shorten again: |
c877efb2 | 540 | * 50 * (tn->full_children + tnode_child_length(tn) - |
91b9a277 | 541 | * tn->empty_children) >= inflate_threshold * |
19baf839 | 542 | * tnode_child_length(tn) |
c877efb2 | 543 | * |
19baf839 RO |
544 | */ |
545 | ||
546 | check_tnode(tn); | |
c877efb2 | 547 | |
e6308be8 RO |
548 | /* Keep root node larger */ |
549 | ||
550 | if(!tn->parent) | |
551 | inflate_threshold_use = inflate_threshold_root; | |
552 | else | |
553 | inflate_threshold_use = inflate_threshold; | |
554 | ||
2f36895a | 555 | err = 0; |
19baf839 RO |
556 | while ((tn->full_children > 0 && |
557 | 50 * (tn->full_children + tnode_child_length(tn) - tn->empty_children) >= | |
e6308be8 | 558 | inflate_threshold_use * tnode_child_length(tn))) { |
19baf839 | 559 | |
2f80b3c8 RO |
560 | old_tn = tn; |
561 | tn = inflate(t, tn); | |
562 | if (IS_ERR(tn)) { | |
563 | tn = old_tn; | |
2f36895a RO |
564 | #ifdef CONFIG_IP_FIB_TRIE_STATS |
565 | t->stats.resize_node_skipped++; | |
566 | #endif | |
567 | break; | |
568 | } | |
19baf839 RO |
569 | } |
570 | ||
571 | check_tnode(tn); | |
572 | ||
573 | /* | |
574 | * Halve as long as the number of empty children in this | |
575 | * node is above threshold. | |
576 | */ | |
2f36895a | 577 | |
e6308be8 RO |
578 | |
579 | /* Keep root node larger */ | |
580 | ||
581 | if(!tn->parent) | |
582 | halve_threshold_use = halve_threshold_root; | |
583 | else | |
584 | halve_threshold_use = halve_threshold; | |
585 | ||
2f36895a | 586 | err = 0; |
19baf839 RO |
587 | while (tn->bits > 1 && |
588 | 100 * (tnode_child_length(tn) - tn->empty_children) < | |
e6308be8 | 589 | halve_threshold_use * tnode_child_length(tn)) { |
2f36895a | 590 | |
2f80b3c8 RO |
591 | old_tn = tn; |
592 | tn = halve(t, tn); | |
593 | if (IS_ERR(tn)) { | |
594 | tn = old_tn; | |
2f36895a RO |
595 | #ifdef CONFIG_IP_FIB_TRIE_STATS |
596 | t->stats.resize_node_skipped++; | |
597 | #endif | |
598 | break; | |
599 | } | |
600 | } | |
19baf839 | 601 | |
c877efb2 | 602 | |
19baf839 | 603 | /* Only one child remains */ |
19baf839 RO |
604 | if (tn->empty_children == tnode_child_length(tn) - 1) |
605 | for (i = 0; i < tnode_child_length(tn); i++) { | |
91b9a277 | 606 | struct node *n; |
19baf839 | 607 | |
91b9a277 | 608 | n = tn->child[i]; |
2373ce1c | 609 | if (!n) |
91b9a277 | 610 | continue; |
91b9a277 OJ |
611 | |
612 | /* compress one level */ | |
613 | ||
2373ce1c | 614 | NODE_SET_PARENT(n, NULL); |
91b9a277 OJ |
615 | tnode_free(tn); |
616 | return n; | |
19baf839 RO |
617 | } |
618 | ||
619 | return (struct node *) tn; | |
620 | } | |
621 | ||
2f80b3c8 | 622 | static struct tnode *inflate(struct trie *t, struct tnode *tn) |
19baf839 RO |
623 | { |
624 | struct tnode *inode; | |
625 | struct tnode *oldtnode = tn; | |
626 | int olen = tnode_child_length(tn); | |
627 | int i; | |
628 | ||
0c7770c7 | 629 | pr_debug("In inflate\n"); |
19baf839 RO |
630 | |
631 | tn = tnode_new(oldtnode->key, oldtnode->pos, oldtnode->bits + 1); | |
632 | ||
0c7770c7 | 633 | if (!tn) |
2f80b3c8 | 634 | return ERR_PTR(-ENOMEM); |
2f36895a RO |
635 | |
636 | /* | |
c877efb2 SH |
637 | * Preallocate and store tnodes before the actual work so we |
638 | * don't get into an inconsistent state if memory allocation | |
639 | * fails. In case of failure we return the oldnode and inflate | |
2f36895a RO |
640 | * of tnode is ignored. |
641 | */ | |
91b9a277 OJ |
642 | |
643 | for (i = 0; i < olen; i++) { | |
2f36895a RO |
644 | struct tnode *inode = (struct tnode *) tnode_get_child(oldtnode, i); |
645 | ||
646 | if (inode && | |
647 | IS_TNODE(inode) && | |
648 | inode->pos == oldtnode->pos + oldtnode->bits && | |
649 | inode->bits > 1) { | |
650 | struct tnode *left, *right; | |
2f36895a | 651 | t_key m = TKEY_GET_MASK(inode->pos, 1); |
c877efb2 | 652 | |
2f36895a RO |
653 | left = tnode_new(inode->key&(~m), inode->pos + 1, |
654 | inode->bits - 1); | |
2f80b3c8 RO |
655 | if (!left) |
656 | goto nomem; | |
91b9a277 | 657 | |
2f36895a RO |
658 | right = tnode_new(inode->key|m, inode->pos + 1, |
659 | inode->bits - 1); | |
660 | ||
2f80b3c8 RO |
661 | if (!right) { |
662 | tnode_free(left); | |
663 | goto nomem; | |
664 | } | |
2f36895a RO |
665 | |
666 | put_child(t, tn, 2*i, (struct node *) left); | |
667 | put_child(t, tn, 2*i+1, (struct node *) right); | |
668 | } | |
669 | } | |
670 | ||
91b9a277 | 671 | for (i = 0; i < olen; i++) { |
19baf839 | 672 | struct node *node = tnode_get_child(oldtnode, i); |
91b9a277 OJ |
673 | struct tnode *left, *right; |
674 | int size, j; | |
c877efb2 | 675 | |
19baf839 RO |
676 | /* An empty child */ |
677 | if (node == NULL) | |
678 | continue; | |
679 | ||
680 | /* A leaf or an internal node with skipped bits */ | |
681 | ||
c877efb2 | 682 | if (IS_LEAF(node) || ((struct tnode *) node)->pos > |
19baf839 | 683 | tn->pos + tn->bits - 1) { |
c877efb2 | 684 | if (tkey_extract_bits(node->key, oldtnode->pos + oldtnode->bits, |
19baf839 RO |
685 | 1) == 0) |
686 | put_child(t, tn, 2*i, node); | |
687 | else | |
688 | put_child(t, tn, 2*i+1, node); | |
689 | continue; | |
690 | } | |
691 | ||
692 | /* An internal node with two children */ | |
693 | inode = (struct tnode *) node; | |
694 | ||
695 | if (inode->bits == 1) { | |
696 | put_child(t, tn, 2*i, inode->child[0]); | |
697 | put_child(t, tn, 2*i+1, inode->child[1]); | |
698 | ||
699 | tnode_free(inode); | |
91b9a277 | 700 | continue; |
19baf839 RO |
701 | } |
702 | ||
91b9a277 OJ |
703 | /* An internal node with more than two children */ |
704 | ||
705 | /* We will replace this node 'inode' with two new | |
706 | * ones, 'left' and 'right', each with half of the | |
707 | * original children. The two new nodes will have | |
708 | * a position one bit further down the key and this | |
709 | * means that the "significant" part of their keys | |
710 | * (see the discussion near the top of this file) | |
711 | * will differ by one bit, which will be "0" in | |
712 | * left's key and "1" in right's key. Since we are | |
713 | * moving the key position by one step, the bit that | |
714 | * we are moving away from - the bit at position | |
715 | * (inode->pos) - is the one that will differ between | |
716 | * left and right. So... we synthesize that bit in the | |
717 | * two new keys. | |
718 | * The mask 'm' below will be a single "one" bit at | |
719 | * the position (inode->pos) | |
720 | */ | |
19baf839 | 721 | |
91b9a277 OJ |
722 | /* Use the old key, but set the new significant |
723 | * bit to zero. | |
724 | */ | |
2f36895a | 725 | |
91b9a277 OJ |
726 | left = (struct tnode *) tnode_get_child(tn, 2*i); |
727 | put_child(t, tn, 2*i, NULL); | |
2f36895a | 728 | |
91b9a277 | 729 | BUG_ON(!left); |
2f36895a | 730 | |
91b9a277 OJ |
731 | right = (struct tnode *) tnode_get_child(tn, 2*i+1); |
732 | put_child(t, tn, 2*i+1, NULL); | |
19baf839 | 733 | |
91b9a277 | 734 | BUG_ON(!right); |
19baf839 | 735 | |
91b9a277 OJ |
736 | size = tnode_child_length(left); |
737 | for (j = 0; j < size; j++) { | |
738 | put_child(t, left, j, inode->child[j]); | |
739 | put_child(t, right, j, inode->child[j + size]); | |
19baf839 | 740 | } |
91b9a277 OJ |
741 | put_child(t, tn, 2*i, resize(t, left)); |
742 | put_child(t, tn, 2*i+1, resize(t, right)); | |
743 | ||
744 | tnode_free(inode); | |
19baf839 RO |
745 | } |
746 | tnode_free(oldtnode); | |
747 | return tn; | |
2f80b3c8 RO |
748 | nomem: |
749 | { | |
750 | int size = tnode_child_length(tn); | |
751 | int j; | |
752 | ||
0c7770c7 | 753 | for (j = 0; j < size; j++) |
2f80b3c8 RO |
754 | if (tn->child[j]) |
755 | tnode_free((struct tnode *)tn->child[j]); | |
756 | ||
757 | tnode_free(tn); | |
0c7770c7 | 758 | |
2f80b3c8 RO |
759 | return ERR_PTR(-ENOMEM); |
760 | } | |
19baf839 RO |
761 | } |
762 | ||
2f80b3c8 | 763 | static struct tnode *halve(struct trie *t, struct tnode *tn) |
19baf839 RO |
764 | { |
765 | struct tnode *oldtnode = tn; | |
766 | struct node *left, *right; | |
767 | int i; | |
768 | int olen = tnode_child_length(tn); | |
769 | ||
0c7770c7 | 770 | pr_debug("In halve\n"); |
c877efb2 SH |
771 | |
772 | tn = tnode_new(oldtnode->key, oldtnode->pos, oldtnode->bits - 1); | |
19baf839 | 773 | |
2f80b3c8 RO |
774 | if (!tn) |
775 | return ERR_PTR(-ENOMEM); | |
2f36895a RO |
776 | |
777 | /* | |
c877efb2 SH |
778 | * Preallocate and store tnodes before the actual work so we |
779 | * don't get into an inconsistent state if memory allocation | |
780 | * fails. In case of failure we return the oldnode and halve | |
2f36895a RO |
781 | * of tnode is ignored. |
782 | */ | |
783 | ||
91b9a277 | 784 | for (i = 0; i < olen; i += 2) { |
2f36895a RO |
785 | left = tnode_get_child(oldtnode, i); |
786 | right = tnode_get_child(oldtnode, i+1); | |
c877efb2 | 787 | |
2f36895a | 788 | /* Two nonempty children */ |
0c7770c7 | 789 | if (left && right) { |
2f80b3c8 | 790 | struct tnode *newn; |
0c7770c7 | 791 | |
2f80b3c8 | 792 | newn = tnode_new(left->key, tn->pos + tn->bits, 1); |
0c7770c7 SH |
793 | |
794 | if (!newn) | |
2f80b3c8 | 795 | goto nomem; |
0c7770c7 | 796 | |
2f80b3c8 | 797 | put_child(t, tn, i/2, (struct node *)newn); |
2f36895a | 798 | } |
2f36895a | 799 | |
2f36895a | 800 | } |
19baf839 | 801 | |
91b9a277 OJ |
802 | for (i = 0; i < olen; i += 2) { |
803 | struct tnode *newBinNode; | |
804 | ||
19baf839 RO |
805 | left = tnode_get_child(oldtnode, i); |
806 | right = tnode_get_child(oldtnode, i+1); | |
c877efb2 | 807 | |
19baf839 RO |
808 | /* At least one of the children is empty */ |
809 | if (left == NULL) { | |
810 | if (right == NULL) /* Both are empty */ | |
811 | continue; | |
812 | put_child(t, tn, i/2, right); | |
91b9a277 | 813 | continue; |
0c7770c7 | 814 | } |
91b9a277 OJ |
815 | |
816 | if (right == NULL) { | |
19baf839 | 817 | put_child(t, tn, i/2, left); |
91b9a277 OJ |
818 | continue; |
819 | } | |
c877efb2 | 820 | |
19baf839 | 821 | /* Two nonempty children */ |
91b9a277 OJ |
822 | newBinNode = (struct tnode *) tnode_get_child(tn, i/2); |
823 | put_child(t, tn, i/2, NULL); | |
91b9a277 OJ |
824 | put_child(t, newBinNode, 0, left); |
825 | put_child(t, newBinNode, 1, right); | |
826 | put_child(t, tn, i/2, resize(t, newBinNode)); | |
19baf839 RO |
827 | } |
828 | tnode_free(oldtnode); | |
829 | return tn; | |
2f80b3c8 RO |
830 | nomem: |
831 | { | |
832 | int size = tnode_child_length(tn); | |
833 | int j; | |
834 | ||
0c7770c7 | 835 | for (j = 0; j < size; j++) |
2f80b3c8 RO |
836 | if (tn->child[j]) |
837 | tnode_free((struct tnode *)tn->child[j]); | |
838 | ||
839 | tnode_free(tn); | |
0c7770c7 | 840 | |
2f80b3c8 RO |
841 | return ERR_PTR(-ENOMEM); |
842 | } | |
19baf839 RO |
843 | } |
844 | ||
91b9a277 | 845 | static void trie_init(struct trie *t) |
19baf839 | 846 | { |
91b9a277 OJ |
847 | if (!t) |
848 | return; | |
849 | ||
850 | t->size = 0; | |
2373ce1c | 851 | rcu_assign_pointer(t->trie, NULL); |
91b9a277 | 852 | t->revision = 0; |
19baf839 | 853 | #ifdef CONFIG_IP_FIB_TRIE_STATS |
91b9a277 | 854 | memset(&t->stats, 0, sizeof(struct trie_use_stats)); |
19baf839 | 855 | #endif |
19baf839 RO |
856 | } |
857 | ||
772cb712 | 858 | /* readside must use rcu_read_lock currently dump routines |
2373ce1c RO |
859 | via get_fa_head and dump */ |
860 | ||
772cb712 | 861 | static struct leaf_info *find_leaf_info(struct leaf *l, int plen) |
19baf839 | 862 | { |
772cb712 | 863 | struct hlist_head *head = &l->list; |
19baf839 RO |
864 | struct hlist_node *node; |
865 | struct leaf_info *li; | |
866 | ||
2373ce1c | 867 | hlist_for_each_entry_rcu(li, node, head, hlist) |
c877efb2 | 868 | if (li->plen == plen) |
19baf839 | 869 | return li; |
91b9a277 | 870 | |
19baf839 RO |
871 | return NULL; |
872 | } | |
873 | ||
874 | static inline struct list_head * get_fa_head(struct leaf *l, int plen) | |
875 | { | |
772cb712 | 876 | struct leaf_info *li = find_leaf_info(l, plen); |
c877efb2 | 877 | |
91b9a277 OJ |
878 | if (!li) |
879 | return NULL; | |
c877efb2 | 880 | |
91b9a277 | 881 | return &li->falh; |
19baf839 RO |
882 | } |
883 | ||
884 | static void insert_leaf_info(struct hlist_head *head, struct leaf_info *new) | |
885 | { | |
2373ce1c RO |
886 | struct leaf_info *li = NULL, *last = NULL; |
887 | struct hlist_node *node; | |
888 | ||
889 | if (hlist_empty(head)) { | |
890 | hlist_add_head_rcu(&new->hlist, head); | |
891 | } else { | |
892 | hlist_for_each_entry(li, node, head, hlist) { | |
893 | if (new->plen > li->plen) | |
894 | break; | |
895 | ||
896 | last = li; | |
897 | } | |
898 | if (last) | |
899 | hlist_add_after_rcu(&last->hlist, &new->hlist); | |
900 | else | |
901 | hlist_add_before_rcu(&new->hlist, &li->hlist); | |
902 | } | |
19baf839 RO |
903 | } |
904 | ||
2373ce1c RO |
905 | /* rcu_read_lock needs to be hold by caller from readside */ |
906 | ||
19baf839 RO |
907 | static struct leaf * |
908 | fib_find_node(struct trie *t, u32 key) | |
909 | { | |
910 | int pos; | |
911 | struct tnode *tn; | |
912 | struct node *n; | |
913 | ||
914 | pos = 0; | |
2373ce1c | 915 | n = rcu_dereference(t->trie); |
19baf839 RO |
916 | |
917 | while (n != NULL && NODE_TYPE(n) == T_TNODE) { | |
918 | tn = (struct tnode *) n; | |
91b9a277 | 919 | |
19baf839 | 920 | check_tnode(tn); |
91b9a277 | 921 | |
c877efb2 | 922 | if (tkey_sub_equals(tn->key, pos, tn->pos-pos, key)) { |
91b9a277 | 923 | pos = tn->pos + tn->bits; |
19baf839 | 924 | n = tnode_get_child(tn, tkey_extract_bits(key, tn->pos, tn->bits)); |
91b9a277 | 925 | } else |
19baf839 RO |
926 | break; |
927 | } | |
928 | /* Case we have found a leaf. Compare prefixes */ | |
929 | ||
91b9a277 OJ |
930 | if (n != NULL && IS_LEAF(n) && tkey_equals(key, n->key)) |
931 | return (struct leaf *)n; | |
932 | ||
19baf839 RO |
933 | return NULL; |
934 | } | |
935 | ||
936 | static struct node *trie_rebalance(struct trie *t, struct tnode *tn) | |
937 | { | |
19baf839 RO |
938 | int wasfull; |
939 | t_key cindex, key; | |
940 | struct tnode *tp = NULL; | |
941 | ||
19baf839 | 942 | key = tn->key; |
19baf839 RO |
943 | |
944 | while (tn != NULL && NODE_PARENT(tn) != NULL) { | |
19baf839 RO |
945 | |
946 | tp = NODE_PARENT(tn); | |
947 | cindex = tkey_extract_bits(key, tp->pos, tp->bits); | |
948 | wasfull = tnode_full(tp, tnode_get_child(tp, cindex)); | |
949 | tn = (struct tnode *) resize (t, (struct tnode *)tn); | |
950 | tnode_put_child_reorg((struct tnode *)tp, cindex,(struct node*)tn, wasfull); | |
91b9a277 | 951 | |
c877efb2 | 952 | if (!NODE_PARENT(tn)) |
19baf839 RO |
953 | break; |
954 | ||
955 | tn = NODE_PARENT(tn); | |
956 | } | |
957 | /* Handle last (top) tnode */ | |
c877efb2 | 958 | if (IS_TNODE(tn)) |
19baf839 RO |
959 | tn = (struct tnode*) resize(t, (struct tnode *)tn); |
960 | ||
961 | return (struct node*) tn; | |
962 | } | |
963 | ||
2373ce1c RO |
964 | /* only used from updater-side */ |
965 | ||
f835e471 RO |
966 | static struct list_head * |
967 | fib_insert_node(struct trie *t, int *err, u32 key, int plen) | |
19baf839 RO |
968 | { |
969 | int pos, newpos; | |
970 | struct tnode *tp = NULL, *tn = NULL; | |
971 | struct node *n; | |
972 | struct leaf *l; | |
973 | int missbit; | |
c877efb2 | 974 | struct list_head *fa_head = NULL; |
19baf839 RO |
975 | struct leaf_info *li; |
976 | t_key cindex; | |
977 | ||
978 | pos = 0; | |
c877efb2 | 979 | n = t->trie; |
19baf839 | 980 | |
c877efb2 SH |
981 | /* If we point to NULL, stop. Either the tree is empty and we should |
982 | * just put a new leaf in if, or we have reached an empty child slot, | |
19baf839 | 983 | * and we should just put our new leaf in that. |
c877efb2 SH |
984 | * If we point to a T_TNODE, check if it matches our key. Note that |
985 | * a T_TNODE might be skipping any number of bits - its 'pos' need | |
19baf839 RO |
986 | * not be the parent's 'pos'+'bits'! |
987 | * | |
c877efb2 | 988 | * If it does match the current key, get pos/bits from it, extract |
19baf839 RO |
989 | * the index from our key, push the T_TNODE and walk the tree. |
990 | * | |
991 | * If it doesn't, we have to replace it with a new T_TNODE. | |
992 | * | |
c877efb2 SH |
993 | * If we point to a T_LEAF, it might or might not have the same key |
994 | * as we do. If it does, just change the value, update the T_LEAF's | |
995 | * value, and return it. | |
19baf839 RO |
996 | * If it doesn't, we need to replace it with a T_TNODE. |
997 | */ | |
998 | ||
999 | while (n != NULL && NODE_TYPE(n) == T_TNODE) { | |
1000 | tn = (struct tnode *) n; | |
91b9a277 | 1001 | |
c877efb2 | 1002 | check_tnode(tn); |
91b9a277 | 1003 | |
c877efb2 | 1004 | if (tkey_sub_equals(tn->key, pos, tn->pos-pos, key)) { |
19baf839 | 1005 | tp = tn; |
91b9a277 | 1006 | pos = tn->pos + tn->bits; |
19baf839 RO |
1007 | n = tnode_get_child(tn, tkey_extract_bits(key, tn->pos, tn->bits)); |
1008 | ||
0c7770c7 | 1009 | BUG_ON(n && NODE_PARENT(n) != tn); |
91b9a277 | 1010 | } else |
19baf839 RO |
1011 | break; |
1012 | } | |
1013 | ||
1014 | /* | |
1015 | * n ----> NULL, LEAF or TNODE | |
1016 | * | |
c877efb2 | 1017 | * tp is n's (parent) ----> NULL or TNODE |
19baf839 RO |
1018 | */ |
1019 | ||
91b9a277 | 1020 | BUG_ON(tp && IS_LEAF(tp)); |
19baf839 RO |
1021 | |
1022 | /* Case 1: n is a leaf. Compare prefixes */ | |
1023 | ||
c877efb2 | 1024 | if (n != NULL && IS_LEAF(n) && tkey_equals(key, n->key)) { |
91b9a277 OJ |
1025 | struct leaf *l = (struct leaf *) n; |
1026 | ||
19baf839 | 1027 | li = leaf_info_new(plen); |
91b9a277 | 1028 | |
c877efb2 | 1029 | if (!li) { |
f835e471 RO |
1030 | *err = -ENOMEM; |
1031 | goto err; | |
1032 | } | |
19baf839 RO |
1033 | |
1034 | fa_head = &li->falh; | |
1035 | insert_leaf_info(&l->list, li); | |
1036 | goto done; | |
1037 | } | |
1038 | t->size++; | |
1039 | l = leaf_new(); | |
1040 | ||
c877efb2 | 1041 | if (!l) { |
f835e471 RO |
1042 | *err = -ENOMEM; |
1043 | goto err; | |
1044 | } | |
19baf839 RO |
1045 | |
1046 | l->key = key; | |
1047 | li = leaf_info_new(plen); | |
1048 | ||
c877efb2 | 1049 | if (!li) { |
f835e471 RO |
1050 | tnode_free((struct tnode *) l); |
1051 | *err = -ENOMEM; | |
1052 | goto err; | |
1053 | } | |
19baf839 RO |
1054 | |
1055 | fa_head = &li->falh; | |
1056 | insert_leaf_info(&l->list, li); | |
1057 | ||
19baf839 | 1058 | if (t->trie && n == NULL) { |
91b9a277 | 1059 | /* Case 2: n is NULL, and will just insert a new leaf */ |
19baf839 RO |
1060 | |
1061 | NODE_SET_PARENT(l, tp); | |
19baf839 | 1062 | |
91b9a277 OJ |
1063 | cindex = tkey_extract_bits(key, tp->pos, tp->bits); |
1064 | put_child(t, (struct tnode *)tp, cindex, (struct node *)l); | |
1065 | } else { | |
1066 | /* Case 3: n is a LEAF or a TNODE and the key doesn't match. */ | |
c877efb2 SH |
1067 | /* |
1068 | * Add a new tnode here | |
19baf839 RO |
1069 | * first tnode need some special handling |
1070 | */ | |
1071 | ||
1072 | if (tp) | |
91b9a277 | 1073 | pos = tp->pos+tp->bits; |
19baf839 | 1074 | else |
91b9a277 OJ |
1075 | pos = 0; |
1076 | ||
c877efb2 | 1077 | if (n) { |
19baf839 RO |
1078 | newpos = tkey_mismatch(key, pos, n->key); |
1079 | tn = tnode_new(n->key, newpos, 1); | |
91b9a277 | 1080 | } else { |
19baf839 | 1081 | newpos = 0; |
c877efb2 | 1082 | tn = tnode_new(key, newpos, 1); /* First tnode */ |
19baf839 | 1083 | } |
19baf839 | 1084 | |
c877efb2 | 1085 | if (!tn) { |
f835e471 RO |
1086 | free_leaf_info(li); |
1087 | tnode_free((struct tnode *) l); | |
1088 | *err = -ENOMEM; | |
1089 | goto err; | |
91b9a277 OJ |
1090 | } |
1091 | ||
19baf839 RO |
1092 | NODE_SET_PARENT(tn, tp); |
1093 | ||
91b9a277 | 1094 | missbit = tkey_extract_bits(key, newpos, 1); |
19baf839 RO |
1095 | put_child(t, tn, missbit, (struct node *)l); |
1096 | put_child(t, tn, 1-missbit, n); | |
1097 | ||
c877efb2 | 1098 | if (tp) { |
19baf839 RO |
1099 | cindex = tkey_extract_bits(key, tp->pos, tp->bits); |
1100 | put_child(t, (struct tnode *)tp, cindex, (struct node *)tn); | |
91b9a277 | 1101 | } else { |
2373ce1c | 1102 | rcu_assign_pointer(t->trie, (struct node *)tn); /* First tnode */ |
19baf839 RO |
1103 | tp = tn; |
1104 | } | |
1105 | } | |
91b9a277 OJ |
1106 | |
1107 | if (tp && tp->pos + tp->bits > 32) | |
78c6671a | 1108 | printk(KERN_WARNING "fib_trie tp=%p pos=%d, bits=%d, key=%0x plen=%d\n", |
19baf839 | 1109 | tp, tp->pos, tp->bits, key, plen); |
91b9a277 | 1110 | |
19baf839 | 1111 | /* Rebalance the trie */ |
2373ce1c RO |
1112 | |
1113 | rcu_assign_pointer(t->trie, trie_rebalance(t, tp)); | |
f835e471 RO |
1114 | done: |
1115 | t->revision++; | |
91b9a277 | 1116 | err: |
19baf839 RO |
1117 | return fa_head; |
1118 | } | |
1119 | ||
1120 | static int | |
1121 | fn_trie_insert(struct fib_table *tb, struct rtmsg *r, struct kern_rta *rta, | |
1122 | struct nlmsghdr *nlhdr, struct netlink_skb_parms *req) | |
1123 | { | |
1124 | struct trie *t = (struct trie *) tb->tb_data; | |
1125 | struct fib_alias *fa, *new_fa; | |
c877efb2 | 1126 | struct list_head *fa_head = NULL; |
19baf839 RO |
1127 | struct fib_info *fi; |
1128 | int plen = r->rtm_dst_len; | |
1129 | int type = r->rtm_type; | |
1130 | u8 tos = r->rtm_tos; | |
1131 | u32 key, mask; | |
1132 | int err; | |
1133 | struct leaf *l; | |
1134 | ||
1135 | if (plen > 32) | |
1136 | return -EINVAL; | |
1137 | ||
1138 | key = 0; | |
c877efb2 | 1139 | if (rta->rta_dst) |
19baf839 RO |
1140 | memcpy(&key, rta->rta_dst, 4); |
1141 | ||
1142 | key = ntohl(key); | |
1143 | ||
0c7770c7 | 1144 | pr_debug("Insert table=%d %08x/%d\n", tb->tb_id, key, plen); |
19baf839 | 1145 | |
91b9a277 | 1146 | mask = ntohl(inet_make_mask(plen)); |
19baf839 | 1147 | |
c877efb2 | 1148 | if (key & ~mask) |
19baf839 RO |
1149 | return -EINVAL; |
1150 | ||
1151 | key = key & mask; | |
1152 | ||
91b9a277 OJ |
1153 | fi = fib_create_info(r, rta, nlhdr, &err); |
1154 | ||
1155 | if (!fi) | |
19baf839 RO |
1156 | goto err; |
1157 | ||
1158 | l = fib_find_node(t, key); | |
c877efb2 | 1159 | fa = NULL; |
19baf839 | 1160 | |
c877efb2 | 1161 | if (l) { |
19baf839 RO |
1162 | fa_head = get_fa_head(l, plen); |
1163 | fa = fib_find_alias(fa_head, tos, fi->fib_priority); | |
1164 | } | |
1165 | ||
1166 | /* Now fa, if non-NULL, points to the first fib alias | |
1167 | * with the same keys [prefix,tos,priority], if such key already | |
1168 | * exists or to the node before which we will insert new one. | |
1169 | * | |
1170 | * If fa is NULL, we will need to allocate a new one and | |
1171 | * insert to the head of f. | |
1172 | * | |
1173 | * If f is NULL, no fib node matched the destination key | |
1174 | * and we need to allocate a new one of those as well. | |
1175 | */ | |
1176 | ||
91b9a277 | 1177 | if (fa && fa->fa_info->fib_priority == fi->fib_priority) { |
19baf839 RO |
1178 | struct fib_alias *fa_orig; |
1179 | ||
1180 | err = -EEXIST; | |
1181 | if (nlhdr->nlmsg_flags & NLM_F_EXCL) | |
1182 | goto out; | |
1183 | ||
1184 | if (nlhdr->nlmsg_flags & NLM_F_REPLACE) { | |
1185 | struct fib_info *fi_drop; | |
1186 | u8 state; | |
1187 | ||
2373ce1c RO |
1188 | err = -ENOBUFS; |
1189 | new_fa = kmem_cache_alloc(fn_alias_kmem, SLAB_KERNEL); | |
1190 | if (new_fa == NULL) | |
1191 | goto out; | |
19baf839 RO |
1192 | |
1193 | fi_drop = fa->fa_info; | |
2373ce1c RO |
1194 | new_fa->fa_tos = fa->fa_tos; |
1195 | new_fa->fa_info = fi; | |
1196 | new_fa->fa_type = type; | |
1197 | new_fa->fa_scope = r->rtm_scope; | |
19baf839 | 1198 | state = fa->fa_state; |
2373ce1c | 1199 | new_fa->fa_state &= ~FA_S_ACCESSED; |
19baf839 | 1200 | |
2373ce1c RO |
1201 | list_replace_rcu(&fa->fa_list, &new_fa->fa_list); |
1202 | alias_free_mem_rcu(fa); | |
19baf839 RO |
1203 | |
1204 | fib_release_info(fi_drop); | |
1205 | if (state & FA_S_ACCESSED) | |
91b9a277 | 1206 | rt_cache_flush(-1); |
19baf839 | 1207 | |
91b9a277 | 1208 | goto succeeded; |
19baf839 RO |
1209 | } |
1210 | /* Error if we find a perfect match which | |
1211 | * uses the same scope, type, and nexthop | |
1212 | * information. | |
1213 | */ | |
1214 | fa_orig = fa; | |
1215 | list_for_each_entry(fa, fa_orig->fa_list.prev, fa_list) { | |
1216 | if (fa->fa_tos != tos) | |
1217 | break; | |
1218 | if (fa->fa_info->fib_priority != fi->fib_priority) | |
1219 | break; | |
1220 | if (fa->fa_type == type && | |
1221 | fa->fa_scope == r->rtm_scope && | |
1222 | fa->fa_info == fi) { | |
1223 | goto out; | |
1224 | } | |
1225 | } | |
1226 | if (!(nlhdr->nlmsg_flags & NLM_F_APPEND)) | |
1227 | fa = fa_orig; | |
1228 | } | |
1229 | err = -ENOENT; | |
91b9a277 | 1230 | if (!(nlhdr->nlmsg_flags & NLM_F_CREATE)) |
19baf839 RO |
1231 | goto out; |
1232 | ||
1233 | err = -ENOBUFS; | |
1234 | new_fa = kmem_cache_alloc(fn_alias_kmem, SLAB_KERNEL); | |
1235 | if (new_fa == NULL) | |
1236 | goto out; | |
1237 | ||
1238 | new_fa->fa_info = fi; | |
1239 | new_fa->fa_tos = tos; | |
1240 | new_fa->fa_type = type; | |
1241 | new_fa->fa_scope = r->rtm_scope; | |
1242 | new_fa->fa_state = 0; | |
19baf839 RO |
1243 | /* |
1244 | * Insert new entry to the list. | |
1245 | */ | |
1246 | ||
c877efb2 | 1247 | if (!fa_head) { |
f835e471 RO |
1248 | fa_head = fib_insert_node(t, &err, key, plen); |
1249 | err = 0; | |
c877efb2 | 1250 | if (err) |
f835e471 RO |
1251 | goto out_free_new_fa; |
1252 | } | |
19baf839 | 1253 | |
2373ce1c RO |
1254 | list_add_tail_rcu(&new_fa->fa_list, |
1255 | (fa ? &fa->fa_list : fa_head)); | |
19baf839 RO |
1256 | |
1257 | rt_cache_flush(-1); | |
1258 | rtmsg_fib(RTM_NEWROUTE, htonl(key), new_fa, plen, tb->tb_id, nlhdr, req); | |
1259 | succeeded: | |
1260 | return 0; | |
f835e471 RO |
1261 | |
1262 | out_free_new_fa: | |
1263 | kmem_cache_free(fn_alias_kmem, new_fa); | |
19baf839 RO |
1264 | out: |
1265 | fib_release_info(fi); | |
91b9a277 | 1266 | err: |
19baf839 RO |
1267 | return err; |
1268 | } | |
1269 | ||
2373ce1c | 1270 | |
772cb712 | 1271 | /* should be called with rcu_read_lock */ |
0c7770c7 SH |
1272 | static inline int check_leaf(struct trie *t, struct leaf *l, |
1273 | t_key key, int *plen, const struct flowi *flp, | |
06c74270 | 1274 | struct fib_result *res) |
19baf839 | 1275 | { |
06c74270 | 1276 | int err, i; |
19baf839 RO |
1277 | t_key mask; |
1278 | struct leaf_info *li; | |
1279 | struct hlist_head *hhead = &l->list; | |
1280 | struct hlist_node *node; | |
c877efb2 | 1281 | |
2373ce1c | 1282 | hlist_for_each_entry_rcu(li, node, hhead, hlist) { |
19baf839 RO |
1283 | i = li->plen; |
1284 | mask = ntohl(inet_make_mask(i)); | |
c877efb2 | 1285 | if (l->key != (key & mask)) |
19baf839 RO |
1286 | continue; |
1287 | ||
06c74270 | 1288 | if ((err = fib_semantic_match(&li->falh, flp, res, l->key, mask, i)) <= 0) { |
19baf839 RO |
1289 | *plen = i; |
1290 | #ifdef CONFIG_IP_FIB_TRIE_STATS | |
1291 | t->stats.semantic_match_passed++; | |
1292 | #endif | |
06c74270 | 1293 | return err; |
19baf839 RO |
1294 | } |
1295 | #ifdef CONFIG_IP_FIB_TRIE_STATS | |
1296 | t->stats.semantic_match_miss++; | |
1297 | #endif | |
1298 | } | |
06c74270 | 1299 | return 1; |
19baf839 RO |
1300 | } |
1301 | ||
1302 | static int | |
1303 | fn_trie_lookup(struct fib_table *tb, const struct flowi *flp, struct fib_result *res) | |
1304 | { | |
1305 | struct trie *t = (struct trie *) tb->tb_data; | |
1306 | int plen, ret = 0; | |
1307 | struct node *n; | |
1308 | struct tnode *pn; | |
1309 | int pos, bits; | |
91b9a277 | 1310 | t_key key = ntohl(flp->fl4_dst); |
19baf839 RO |
1311 | int chopped_off; |
1312 | t_key cindex = 0; | |
1313 | int current_prefix_length = KEYLENGTH; | |
91b9a277 OJ |
1314 | struct tnode *cn; |
1315 | t_key node_prefix, key_prefix, pref_mismatch; | |
1316 | int mp; | |
1317 | ||
2373ce1c | 1318 | rcu_read_lock(); |
91b9a277 | 1319 | |
2373ce1c | 1320 | n = rcu_dereference(t->trie); |
c877efb2 | 1321 | if (!n) |
19baf839 RO |
1322 | goto failed; |
1323 | ||
1324 | #ifdef CONFIG_IP_FIB_TRIE_STATS | |
1325 | t->stats.gets++; | |
1326 | #endif | |
1327 | ||
1328 | /* Just a leaf? */ | |
1329 | if (IS_LEAF(n)) { | |
06c74270 | 1330 | if ((ret = check_leaf(t, (struct leaf *)n, key, &plen, flp, res)) <= 0) |
19baf839 RO |
1331 | goto found; |
1332 | goto failed; | |
1333 | } | |
1334 | pn = (struct tnode *) n; | |
1335 | chopped_off = 0; | |
c877efb2 | 1336 | |
91b9a277 | 1337 | while (pn) { |
19baf839 RO |
1338 | pos = pn->pos; |
1339 | bits = pn->bits; | |
1340 | ||
c877efb2 | 1341 | if (!chopped_off) |
19baf839 RO |
1342 | cindex = tkey_extract_bits(MASK_PFX(key, current_prefix_length), pos, bits); |
1343 | ||
1344 | n = tnode_get_child(pn, cindex); | |
1345 | ||
1346 | if (n == NULL) { | |
1347 | #ifdef CONFIG_IP_FIB_TRIE_STATS | |
1348 | t->stats.null_node_hit++; | |
1349 | #endif | |
1350 | goto backtrace; | |
1351 | } | |
1352 | ||
91b9a277 OJ |
1353 | if (IS_LEAF(n)) { |
1354 | if ((ret = check_leaf(t, (struct leaf *)n, key, &plen, flp, res)) <= 0) | |
1355 | goto found; | |
1356 | else | |
1357 | goto backtrace; | |
1358 | } | |
1359 | ||
19baf839 RO |
1360 | #define HL_OPTIMIZE |
1361 | #ifdef HL_OPTIMIZE | |
91b9a277 | 1362 | cn = (struct tnode *)n; |
19baf839 | 1363 | |
91b9a277 OJ |
1364 | /* |
1365 | * It's a tnode, and we can do some extra checks here if we | |
1366 | * like, to avoid descending into a dead-end branch. | |
1367 | * This tnode is in the parent's child array at index | |
1368 | * key[p_pos..p_pos+p_bits] but potentially with some bits | |
1369 | * chopped off, so in reality the index may be just a | |
1370 | * subprefix, padded with zero at the end. | |
1371 | * We can also take a look at any skipped bits in this | |
1372 | * tnode - everything up to p_pos is supposed to be ok, | |
1373 | * and the non-chopped bits of the index (se previous | |
1374 | * paragraph) are also guaranteed ok, but the rest is | |
1375 | * considered unknown. | |
1376 | * | |
1377 | * The skipped bits are key[pos+bits..cn->pos]. | |
1378 | */ | |
19baf839 | 1379 | |
91b9a277 OJ |
1380 | /* If current_prefix_length < pos+bits, we are already doing |
1381 | * actual prefix matching, which means everything from | |
1382 | * pos+(bits-chopped_off) onward must be zero along some | |
1383 | * branch of this subtree - otherwise there is *no* valid | |
1384 | * prefix present. Here we can only check the skipped | |
1385 | * bits. Remember, since we have already indexed into the | |
1386 | * parent's child array, we know that the bits we chopped of | |
1387 | * *are* zero. | |
1388 | */ | |
19baf839 | 1389 | |
91b9a277 | 1390 | /* NOTA BENE: CHECKING ONLY SKIPPED BITS FOR THE NEW NODE HERE */ |
19baf839 | 1391 | |
91b9a277 OJ |
1392 | if (current_prefix_length < pos+bits) { |
1393 | if (tkey_extract_bits(cn->key, current_prefix_length, | |
1394 | cn->pos - current_prefix_length) != 0 || | |
1395 | !(cn->child[0])) | |
1396 | goto backtrace; | |
1397 | } | |
19baf839 | 1398 | |
91b9a277 OJ |
1399 | /* |
1400 | * If chopped_off=0, the index is fully validated and we | |
1401 | * only need to look at the skipped bits for this, the new, | |
1402 | * tnode. What we actually want to do is to find out if | |
1403 | * these skipped bits match our key perfectly, or if we will | |
1404 | * have to count on finding a matching prefix further down, | |
1405 | * because if we do, we would like to have some way of | |
1406 | * verifying the existence of such a prefix at this point. | |
1407 | */ | |
19baf839 | 1408 | |
91b9a277 OJ |
1409 | /* The only thing we can do at this point is to verify that |
1410 | * any such matching prefix can indeed be a prefix to our | |
1411 | * key, and if the bits in the node we are inspecting that | |
1412 | * do not match our key are not ZERO, this cannot be true. | |
1413 | * Thus, find out where there is a mismatch (before cn->pos) | |
1414 | * and verify that all the mismatching bits are zero in the | |
1415 | * new tnode's key. | |
1416 | */ | |
19baf839 | 1417 | |
91b9a277 OJ |
1418 | /* Note: We aren't very concerned about the piece of the key |
1419 | * that precede pn->pos+pn->bits, since these have already been | |
1420 | * checked. The bits after cn->pos aren't checked since these are | |
1421 | * by definition "unknown" at this point. Thus, what we want to | |
1422 | * see is if we are about to enter the "prefix matching" state, | |
1423 | * and in that case verify that the skipped bits that will prevail | |
1424 | * throughout this subtree are zero, as they have to be if we are | |
1425 | * to find a matching prefix. | |
1426 | */ | |
1427 | ||
1428 | node_prefix = MASK_PFX(cn->key, cn->pos); | |
1429 | key_prefix = MASK_PFX(key, cn->pos); | |
1430 | pref_mismatch = key_prefix^node_prefix; | |
1431 | mp = 0; | |
1432 | ||
1433 | /* In short: If skipped bits in this node do not match the search | |
1434 | * key, enter the "prefix matching" state.directly. | |
1435 | */ | |
1436 | if (pref_mismatch) { | |
1437 | while (!(pref_mismatch & (1<<(KEYLENGTH-1)))) { | |
1438 | mp++; | |
1439 | pref_mismatch = pref_mismatch <<1; | |
1440 | } | |
1441 | key_prefix = tkey_extract_bits(cn->key, mp, cn->pos-mp); | |
1442 | ||
1443 | if (key_prefix != 0) | |
1444 | goto backtrace; | |
1445 | ||
1446 | if (current_prefix_length >= cn->pos) | |
1447 | current_prefix_length = mp; | |
c877efb2 | 1448 | } |
91b9a277 OJ |
1449 | #endif |
1450 | pn = (struct tnode *)n; /* Descend */ | |
1451 | chopped_off = 0; | |
1452 | continue; | |
1453 | ||
19baf839 RO |
1454 | backtrace: |
1455 | chopped_off++; | |
1456 | ||
1457 | /* As zero don't change the child key (cindex) */ | |
91b9a277 | 1458 | while ((chopped_off <= pn->bits) && !(cindex & (1<<(chopped_off-1)))) |
19baf839 | 1459 | chopped_off++; |
19baf839 RO |
1460 | |
1461 | /* Decrease current_... with bits chopped off */ | |
1462 | if (current_prefix_length > pn->pos + pn->bits - chopped_off) | |
1463 | current_prefix_length = pn->pos + pn->bits - chopped_off; | |
91b9a277 | 1464 | |
19baf839 | 1465 | /* |
c877efb2 | 1466 | * Either we do the actual chop off according or if we have |
19baf839 RO |
1467 | * chopped off all bits in this tnode walk up to our parent. |
1468 | */ | |
1469 | ||
91b9a277 | 1470 | if (chopped_off <= pn->bits) { |
19baf839 | 1471 | cindex &= ~(1 << (chopped_off-1)); |
91b9a277 | 1472 | } else { |
c877efb2 | 1473 | if (NODE_PARENT(pn) == NULL) |
19baf839 | 1474 | goto failed; |
91b9a277 | 1475 | |
19baf839 RO |
1476 | /* Get Child's index */ |
1477 | cindex = tkey_extract_bits(pn->key, NODE_PARENT(pn)->pos, NODE_PARENT(pn)->bits); | |
1478 | pn = NODE_PARENT(pn); | |
1479 | chopped_off = 0; | |
1480 | ||
1481 | #ifdef CONFIG_IP_FIB_TRIE_STATS | |
1482 | t->stats.backtrack++; | |
1483 | #endif | |
1484 | goto backtrace; | |
c877efb2 | 1485 | } |
19baf839 RO |
1486 | } |
1487 | failed: | |
c877efb2 | 1488 | ret = 1; |
19baf839 | 1489 | found: |
2373ce1c | 1490 | rcu_read_unlock(); |
19baf839 RO |
1491 | return ret; |
1492 | } | |
1493 | ||
2373ce1c | 1494 | /* only called from updater side */ |
19baf839 RO |
1495 | static int trie_leaf_remove(struct trie *t, t_key key) |
1496 | { | |
1497 | t_key cindex; | |
1498 | struct tnode *tp = NULL; | |
1499 | struct node *n = t->trie; | |
1500 | struct leaf *l; | |
1501 | ||
0c7770c7 | 1502 | pr_debug("entering trie_leaf_remove(%p)\n", n); |
19baf839 RO |
1503 | |
1504 | /* Note that in the case skipped bits, those bits are *not* checked! | |
c877efb2 | 1505 | * When we finish this, we will have NULL or a T_LEAF, and the |
19baf839 RO |
1506 | * T_LEAF may or may not match our key. |
1507 | */ | |
1508 | ||
91b9a277 | 1509 | while (n != NULL && IS_TNODE(n)) { |
19baf839 RO |
1510 | struct tnode *tn = (struct tnode *) n; |
1511 | check_tnode(tn); | |
1512 | n = tnode_get_child(tn ,tkey_extract_bits(key, tn->pos, tn->bits)); | |
1513 | ||
0c7770c7 | 1514 | BUG_ON(n && NODE_PARENT(n) != tn); |
91b9a277 | 1515 | } |
19baf839 RO |
1516 | l = (struct leaf *) n; |
1517 | ||
c877efb2 | 1518 | if (!n || !tkey_equals(l->key, key)) |
19baf839 | 1519 | return 0; |
c877efb2 SH |
1520 | |
1521 | /* | |
1522 | * Key found. | |
1523 | * Remove the leaf and rebalance the tree | |
19baf839 RO |
1524 | */ |
1525 | ||
1526 | t->revision++; | |
1527 | t->size--; | |
1528 | ||
2373ce1c | 1529 | preempt_disable(); |
19baf839 RO |
1530 | tp = NODE_PARENT(n); |
1531 | tnode_free((struct tnode *) n); | |
1532 | ||
c877efb2 | 1533 | if (tp) { |
19baf839 RO |
1534 | cindex = tkey_extract_bits(key, tp->pos, tp->bits); |
1535 | put_child(t, (struct tnode *)tp, cindex, NULL); | |
2373ce1c | 1536 | rcu_assign_pointer(t->trie, trie_rebalance(t, tp)); |
91b9a277 | 1537 | } else |
2373ce1c RO |
1538 | rcu_assign_pointer(t->trie, NULL); |
1539 | preempt_enable(); | |
19baf839 RO |
1540 | |
1541 | return 1; | |
1542 | } | |
1543 | ||
1544 | static int | |
1545 | fn_trie_delete(struct fib_table *tb, struct rtmsg *r, struct kern_rta *rta, | |
91b9a277 | 1546 | struct nlmsghdr *nlhdr, struct netlink_skb_parms *req) |
19baf839 RO |
1547 | { |
1548 | struct trie *t = (struct trie *) tb->tb_data; | |
1549 | u32 key, mask; | |
1550 | int plen = r->rtm_dst_len; | |
1551 | u8 tos = r->rtm_tos; | |
1552 | struct fib_alias *fa, *fa_to_delete; | |
1553 | struct list_head *fa_head; | |
1554 | struct leaf *l; | |
91b9a277 OJ |
1555 | struct leaf_info *li; |
1556 | ||
19baf839 | 1557 | |
c877efb2 | 1558 | if (plen > 32) |
19baf839 RO |
1559 | return -EINVAL; |
1560 | ||
1561 | key = 0; | |
c877efb2 | 1562 | if (rta->rta_dst) |
19baf839 RO |
1563 | memcpy(&key, rta->rta_dst, 4); |
1564 | ||
1565 | key = ntohl(key); | |
91b9a277 | 1566 | mask = ntohl(inet_make_mask(plen)); |
19baf839 | 1567 | |
c877efb2 | 1568 | if (key & ~mask) |
19baf839 RO |
1569 | return -EINVAL; |
1570 | ||
1571 | key = key & mask; | |
1572 | l = fib_find_node(t, key); | |
1573 | ||
c877efb2 | 1574 | if (!l) |
19baf839 RO |
1575 | return -ESRCH; |
1576 | ||
1577 | fa_head = get_fa_head(l, plen); | |
1578 | fa = fib_find_alias(fa_head, tos, 0); | |
1579 | ||
1580 | if (!fa) | |
1581 | return -ESRCH; | |
1582 | ||
0c7770c7 | 1583 | pr_debug("Deleting %08x/%d tos=%d t=%p\n", key, plen, tos, t); |
19baf839 RO |
1584 | |
1585 | fa_to_delete = NULL; | |
1586 | fa_head = fa->fa_list.prev; | |
2373ce1c | 1587 | |
19baf839 RO |
1588 | list_for_each_entry(fa, fa_head, fa_list) { |
1589 | struct fib_info *fi = fa->fa_info; | |
1590 | ||
1591 | if (fa->fa_tos != tos) | |
1592 | break; | |
1593 | ||
1594 | if ((!r->rtm_type || | |
1595 | fa->fa_type == r->rtm_type) && | |
1596 | (r->rtm_scope == RT_SCOPE_NOWHERE || | |
1597 | fa->fa_scope == r->rtm_scope) && | |
1598 | (!r->rtm_protocol || | |
1599 | fi->fib_protocol == r->rtm_protocol) && | |
1600 | fib_nh_match(r, nlhdr, rta, fi) == 0) { | |
1601 | fa_to_delete = fa; | |
1602 | break; | |
1603 | } | |
1604 | } | |
1605 | ||
91b9a277 OJ |
1606 | if (!fa_to_delete) |
1607 | return -ESRCH; | |
19baf839 | 1608 | |
91b9a277 OJ |
1609 | fa = fa_to_delete; |
1610 | rtmsg_fib(RTM_DELROUTE, htonl(key), fa, plen, tb->tb_id, nlhdr, req); | |
1611 | ||
1612 | l = fib_find_node(t, key); | |
772cb712 | 1613 | li = find_leaf_info(l, plen); |
19baf839 | 1614 | |
2373ce1c | 1615 | list_del_rcu(&fa->fa_list); |
19baf839 | 1616 | |
91b9a277 | 1617 | if (list_empty(fa_head)) { |
2373ce1c | 1618 | hlist_del_rcu(&li->hlist); |
91b9a277 | 1619 | free_leaf_info(li); |
2373ce1c | 1620 | } |
19baf839 | 1621 | |
91b9a277 OJ |
1622 | if (hlist_empty(&l->list)) |
1623 | trie_leaf_remove(t, key); | |
19baf839 | 1624 | |
91b9a277 OJ |
1625 | if (fa->fa_state & FA_S_ACCESSED) |
1626 | rt_cache_flush(-1); | |
19baf839 | 1627 | |
2373ce1c RO |
1628 | fib_release_info(fa->fa_info); |
1629 | alias_free_mem_rcu(fa); | |
91b9a277 | 1630 | return 0; |
19baf839 RO |
1631 | } |
1632 | ||
1633 | static int trie_flush_list(struct trie *t, struct list_head *head) | |
1634 | { | |
1635 | struct fib_alias *fa, *fa_node; | |
1636 | int found = 0; | |
1637 | ||
1638 | list_for_each_entry_safe(fa, fa_node, head, fa_list) { | |
1639 | struct fib_info *fi = fa->fa_info; | |
19baf839 | 1640 | |
2373ce1c RO |
1641 | if (fi && (fi->fib_flags & RTNH_F_DEAD)) { |
1642 | list_del_rcu(&fa->fa_list); | |
1643 | fib_release_info(fa->fa_info); | |
1644 | alias_free_mem_rcu(fa); | |
19baf839 RO |
1645 | found++; |
1646 | } | |
1647 | } | |
1648 | return found; | |
1649 | } | |
1650 | ||
1651 | static int trie_flush_leaf(struct trie *t, struct leaf *l) | |
1652 | { | |
1653 | int found = 0; | |
1654 | struct hlist_head *lih = &l->list; | |
1655 | struct hlist_node *node, *tmp; | |
1656 | struct leaf_info *li = NULL; | |
1657 | ||
1658 | hlist_for_each_entry_safe(li, node, tmp, lih, hlist) { | |
19baf839 RO |
1659 | found += trie_flush_list(t, &li->falh); |
1660 | ||
1661 | if (list_empty(&li->falh)) { | |
2373ce1c | 1662 | hlist_del_rcu(&li->hlist); |
19baf839 RO |
1663 | free_leaf_info(li); |
1664 | } | |
1665 | } | |
1666 | return found; | |
1667 | } | |
1668 | ||
2373ce1c RO |
1669 | /* rcu_read_lock needs to be hold by caller from readside */ |
1670 | ||
19baf839 RO |
1671 | static struct leaf *nextleaf(struct trie *t, struct leaf *thisleaf) |
1672 | { | |
1673 | struct node *c = (struct node *) thisleaf; | |
1674 | struct tnode *p; | |
1675 | int idx; | |
2373ce1c | 1676 | struct node *trie = rcu_dereference(t->trie); |
19baf839 | 1677 | |
c877efb2 | 1678 | if (c == NULL) { |
2373ce1c | 1679 | if (trie == NULL) |
19baf839 RO |
1680 | return NULL; |
1681 | ||
2373ce1c RO |
1682 | if (IS_LEAF(trie)) /* trie w. just a leaf */ |
1683 | return (struct leaf *) trie; | |
19baf839 | 1684 | |
2373ce1c | 1685 | p = (struct tnode*) trie; /* Start */ |
91b9a277 | 1686 | } else |
19baf839 | 1687 | p = (struct tnode *) NODE_PARENT(c); |
c877efb2 | 1688 | |
19baf839 RO |
1689 | while (p) { |
1690 | int pos, last; | |
1691 | ||
1692 | /* Find the next child of the parent */ | |
c877efb2 SH |
1693 | if (c) |
1694 | pos = 1 + tkey_extract_bits(c->key, p->pos, p->bits); | |
1695 | else | |
19baf839 RO |
1696 | pos = 0; |
1697 | ||
1698 | last = 1 << p->bits; | |
91b9a277 | 1699 | for (idx = pos; idx < last ; idx++) { |
2373ce1c RO |
1700 | c = rcu_dereference(p->child[idx]); |
1701 | ||
1702 | if (!c) | |
91b9a277 OJ |
1703 | continue; |
1704 | ||
1705 | /* Decend if tnode */ | |
2373ce1c RO |
1706 | while (IS_TNODE(c)) { |
1707 | p = (struct tnode *) c; | |
1708 | idx = 0; | |
91b9a277 OJ |
1709 | |
1710 | /* Rightmost non-NULL branch */ | |
1711 | if (p && IS_TNODE(p)) | |
2373ce1c RO |
1712 | while (!(c = rcu_dereference(p->child[idx])) |
1713 | && idx < (1<<p->bits)) idx++; | |
91b9a277 OJ |
1714 | |
1715 | /* Done with this tnode? */ | |
2373ce1c | 1716 | if (idx >= (1 << p->bits) || !c) |
91b9a277 | 1717 | goto up; |
19baf839 | 1718 | } |
2373ce1c | 1719 | return (struct leaf *) c; |
19baf839 RO |
1720 | } |
1721 | up: | |
1722 | /* No more children go up one step */ | |
91b9a277 | 1723 | c = (struct node *) p; |
19baf839 RO |
1724 | p = (struct tnode *) NODE_PARENT(p); |
1725 | } | |
1726 | return NULL; /* Ready. Root of trie */ | |
1727 | } | |
1728 | ||
1729 | static int fn_trie_flush(struct fib_table *tb) | |
1730 | { | |
1731 | struct trie *t = (struct trie *) tb->tb_data; | |
1732 | struct leaf *ll = NULL, *l = NULL; | |
1733 | int found = 0, h; | |
1734 | ||
1735 | t->revision++; | |
1736 | ||
91b9a277 | 1737 | for (h = 0; (l = nextleaf(t, l)) != NULL; h++) { |
19baf839 RO |
1738 | found += trie_flush_leaf(t, l); |
1739 | ||
1740 | if (ll && hlist_empty(&ll->list)) | |
1741 | trie_leaf_remove(t, ll->key); | |
1742 | ll = l; | |
1743 | } | |
1744 | ||
1745 | if (ll && hlist_empty(&ll->list)) | |
1746 | trie_leaf_remove(t, ll->key); | |
1747 | ||
0c7770c7 | 1748 | pr_debug("trie_flush found=%d\n", found); |
19baf839 RO |
1749 | return found; |
1750 | } | |
1751 | ||
91b9a277 | 1752 | static int trie_last_dflt = -1; |
19baf839 RO |
1753 | |
1754 | static void | |
1755 | fn_trie_select_default(struct fib_table *tb, const struct flowi *flp, struct fib_result *res) | |
1756 | { | |
1757 | struct trie *t = (struct trie *) tb->tb_data; | |
1758 | int order, last_idx; | |
1759 | struct fib_info *fi = NULL; | |
1760 | struct fib_info *last_resort; | |
1761 | struct fib_alias *fa = NULL; | |
1762 | struct list_head *fa_head; | |
1763 | struct leaf *l; | |
1764 | ||
1765 | last_idx = -1; | |
1766 | last_resort = NULL; | |
1767 | order = -1; | |
1768 | ||
2373ce1c | 1769 | rcu_read_lock(); |
c877efb2 | 1770 | |
19baf839 | 1771 | l = fib_find_node(t, 0); |
c877efb2 | 1772 | if (!l) |
19baf839 RO |
1773 | goto out; |
1774 | ||
1775 | fa_head = get_fa_head(l, 0); | |
c877efb2 | 1776 | if (!fa_head) |
19baf839 RO |
1777 | goto out; |
1778 | ||
c877efb2 | 1779 | if (list_empty(fa_head)) |
19baf839 RO |
1780 | goto out; |
1781 | ||
2373ce1c | 1782 | list_for_each_entry_rcu(fa, fa_head, fa_list) { |
19baf839 | 1783 | struct fib_info *next_fi = fa->fa_info; |
91b9a277 | 1784 | |
19baf839 RO |
1785 | if (fa->fa_scope != res->scope || |
1786 | fa->fa_type != RTN_UNICAST) | |
1787 | continue; | |
91b9a277 | 1788 | |
19baf839 RO |
1789 | if (next_fi->fib_priority > res->fi->fib_priority) |
1790 | break; | |
1791 | if (!next_fi->fib_nh[0].nh_gw || | |
1792 | next_fi->fib_nh[0].nh_scope != RT_SCOPE_LINK) | |
1793 | continue; | |
1794 | fa->fa_state |= FA_S_ACCESSED; | |
91b9a277 | 1795 | |
19baf839 RO |
1796 | if (fi == NULL) { |
1797 | if (next_fi != res->fi) | |
1798 | break; | |
1799 | } else if (!fib_detect_death(fi, order, &last_resort, | |
1800 | &last_idx, &trie_last_dflt)) { | |
1801 | if (res->fi) | |
1802 | fib_info_put(res->fi); | |
1803 | res->fi = fi; | |
1804 | atomic_inc(&fi->fib_clntref); | |
1805 | trie_last_dflt = order; | |
1806 | goto out; | |
1807 | } | |
1808 | fi = next_fi; | |
1809 | order++; | |
1810 | } | |
1811 | if (order <= 0 || fi == NULL) { | |
1812 | trie_last_dflt = -1; | |
1813 | goto out; | |
1814 | } | |
1815 | ||
1816 | if (!fib_detect_death(fi, order, &last_resort, &last_idx, &trie_last_dflt)) { | |
1817 | if (res->fi) | |
1818 | fib_info_put(res->fi); | |
1819 | res->fi = fi; | |
1820 | atomic_inc(&fi->fib_clntref); | |
1821 | trie_last_dflt = order; | |
1822 | goto out; | |
1823 | } | |
1824 | if (last_idx >= 0) { | |
1825 | if (res->fi) | |
1826 | fib_info_put(res->fi); | |
1827 | res->fi = last_resort; | |
1828 | if (last_resort) | |
1829 | atomic_inc(&last_resort->fib_clntref); | |
1830 | } | |
1831 | trie_last_dflt = last_idx; | |
1832 | out:; | |
2373ce1c | 1833 | rcu_read_unlock(); |
19baf839 RO |
1834 | } |
1835 | ||
c877efb2 | 1836 | static int fn_trie_dump_fa(t_key key, int plen, struct list_head *fah, struct fib_table *tb, |
19baf839 RO |
1837 | struct sk_buff *skb, struct netlink_callback *cb) |
1838 | { | |
1839 | int i, s_i; | |
1840 | struct fib_alias *fa; | |
1841 | ||
91b9a277 | 1842 | u32 xkey = htonl(key); |
19baf839 | 1843 | |
91b9a277 | 1844 | s_i = cb->args[3]; |
19baf839 RO |
1845 | i = 0; |
1846 | ||
2373ce1c RO |
1847 | /* rcu_read_lock is hold by caller */ |
1848 | ||
1849 | list_for_each_entry_rcu(fa, fah, fa_list) { | |
19baf839 RO |
1850 | if (i < s_i) { |
1851 | i++; | |
1852 | continue; | |
1853 | } | |
78c6671a | 1854 | BUG_ON(!fa->fa_info); |
19baf839 RO |
1855 | |
1856 | if (fib_dump_info(skb, NETLINK_CB(cb->skb).pid, | |
1857 | cb->nlh->nlmsg_seq, | |
1858 | RTM_NEWROUTE, | |
1859 | tb->tb_id, | |
1860 | fa->fa_type, | |
1861 | fa->fa_scope, | |
1862 | &xkey, | |
1863 | plen, | |
1864 | fa->fa_tos, | |
90f66914 | 1865 | fa->fa_info, 0) < 0) { |
19baf839 RO |
1866 | cb->args[3] = i; |
1867 | return -1; | |
91b9a277 | 1868 | } |
19baf839 RO |
1869 | i++; |
1870 | } | |
91b9a277 | 1871 | cb->args[3] = i; |
19baf839 RO |
1872 | return skb->len; |
1873 | } | |
1874 | ||
c877efb2 | 1875 | static int fn_trie_dump_plen(struct trie *t, int plen, struct fib_table *tb, struct sk_buff *skb, |
19baf839 RO |
1876 | struct netlink_callback *cb) |
1877 | { | |
1878 | int h, s_h; | |
1879 | struct list_head *fa_head; | |
1880 | struct leaf *l = NULL; | |
19baf839 | 1881 | |
91b9a277 | 1882 | s_h = cb->args[2]; |
19baf839 | 1883 | |
91b9a277 | 1884 | for (h = 0; (l = nextleaf(t, l)) != NULL; h++) { |
19baf839 RO |
1885 | if (h < s_h) |
1886 | continue; | |
1887 | if (h > s_h) | |
1888 | memset(&cb->args[3], 0, | |
1889 | sizeof(cb->args) - 3*sizeof(cb->args[0])); | |
1890 | ||
1891 | fa_head = get_fa_head(l, plen); | |
91b9a277 | 1892 | |
c877efb2 | 1893 | if (!fa_head) |
19baf839 RO |
1894 | continue; |
1895 | ||
c877efb2 | 1896 | if (list_empty(fa_head)) |
19baf839 RO |
1897 | continue; |
1898 | ||
1899 | if (fn_trie_dump_fa(l->key, plen, fa_head, tb, skb, cb)<0) { | |
91b9a277 | 1900 | cb->args[2] = h; |
19baf839 RO |
1901 | return -1; |
1902 | } | |
1903 | } | |
91b9a277 | 1904 | cb->args[2] = h; |
19baf839 RO |
1905 | return skb->len; |
1906 | } | |
1907 | ||
1908 | static int fn_trie_dump(struct fib_table *tb, struct sk_buff *skb, struct netlink_callback *cb) | |
1909 | { | |
1910 | int m, s_m; | |
1911 | struct trie *t = (struct trie *) tb->tb_data; | |
1912 | ||
1913 | s_m = cb->args[1]; | |
1914 | ||
2373ce1c | 1915 | rcu_read_lock(); |
91b9a277 | 1916 | for (m = 0; m <= 32; m++) { |
19baf839 RO |
1917 | if (m < s_m) |
1918 | continue; | |
1919 | if (m > s_m) | |
1920 | memset(&cb->args[2], 0, | |
91b9a277 | 1921 | sizeof(cb->args) - 2*sizeof(cb->args[0])); |
19baf839 RO |
1922 | |
1923 | if (fn_trie_dump_plen(t, 32-m, tb, skb, cb)<0) { | |
1924 | cb->args[1] = m; | |
1925 | goto out; | |
1926 | } | |
1927 | } | |
2373ce1c | 1928 | rcu_read_unlock(); |
19baf839 RO |
1929 | cb->args[1] = m; |
1930 | return skb->len; | |
91b9a277 | 1931 | out: |
2373ce1c | 1932 | rcu_read_unlock(); |
19baf839 RO |
1933 | return -1; |
1934 | } | |
1935 | ||
1936 | /* Fix more generic FIB names for init later */ | |
1937 | ||
1938 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
1939 | struct fib_table * fib_hash_init(int id) | |
1940 | #else | |
1941 | struct fib_table * __init fib_hash_init(int id) | |
1942 | #endif | |
1943 | { | |
1944 | struct fib_table *tb; | |
1945 | struct trie *t; | |
1946 | ||
1947 | if (fn_alias_kmem == NULL) | |
1948 | fn_alias_kmem = kmem_cache_create("ip_fib_alias", | |
1949 | sizeof(struct fib_alias), | |
1950 | 0, SLAB_HWCACHE_ALIGN, | |
1951 | NULL, NULL); | |
1952 | ||
1953 | tb = kmalloc(sizeof(struct fib_table) + sizeof(struct trie), | |
1954 | GFP_KERNEL); | |
1955 | if (tb == NULL) | |
1956 | return NULL; | |
1957 | ||
1958 | tb->tb_id = id; | |
1959 | tb->tb_lookup = fn_trie_lookup; | |
1960 | tb->tb_insert = fn_trie_insert; | |
1961 | tb->tb_delete = fn_trie_delete; | |
1962 | tb->tb_flush = fn_trie_flush; | |
1963 | tb->tb_select_default = fn_trie_select_default; | |
1964 | tb->tb_dump = fn_trie_dump; | |
1965 | memset(tb->tb_data, 0, sizeof(struct trie)); | |
1966 | ||
1967 | t = (struct trie *) tb->tb_data; | |
1968 | ||
1969 | trie_init(t); | |
1970 | ||
c877efb2 | 1971 | if (id == RT_TABLE_LOCAL) |
91b9a277 | 1972 | trie_local = t; |
c877efb2 | 1973 | else if (id == RT_TABLE_MAIN) |
91b9a277 | 1974 | trie_main = t; |
19baf839 RO |
1975 | |
1976 | if (id == RT_TABLE_LOCAL) | |
78c6671a | 1977 | printk(KERN_INFO "IPv4 FIB: Using LC-trie version %s\n", VERSION); |
19baf839 RO |
1978 | |
1979 | return tb; | |
1980 | } | |
1981 | ||
cb7b593c SH |
1982 | #ifdef CONFIG_PROC_FS |
1983 | /* Depth first Trie walk iterator */ | |
1984 | struct fib_trie_iter { | |
1985 | struct tnode *tnode; | |
1986 | struct trie *trie; | |
1987 | unsigned index; | |
1988 | unsigned depth; | |
1989 | }; | |
19baf839 | 1990 | |
cb7b593c | 1991 | static struct node *fib_trie_get_next(struct fib_trie_iter *iter) |
19baf839 | 1992 | { |
cb7b593c SH |
1993 | struct tnode *tn = iter->tnode; |
1994 | unsigned cindex = iter->index; | |
1995 | struct tnode *p; | |
19baf839 | 1996 | |
cb7b593c SH |
1997 | pr_debug("get_next iter={node=%p index=%d depth=%d}\n", |
1998 | iter->tnode, iter->index, iter->depth); | |
1999 | rescan: | |
2000 | while (cindex < (1<<tn->bits)) { | |
2001 | struct node *n = tnode_get_child(tn, cindex); | |
19baf839 | 2002 | |
cb7b593c SH |
2003 | if (n) { |
2004 | if (IS_LEAF(n)) { | |
2005 | iter->tnode = tn; | |
2006 | iter->index = cindex + 1; | |
2007 | } else { | |
2008 | /* push down one level */ | |
2009 | iter->tnode = (struct tnode *) n; | |
2010 | iter->index = 0; | |
2011 | ++iter->depth; | |
2012 | } | |
2013 | return n; | |
2014 | } | |
19baf839 | 2015 | |
cb7b593c SH |
2016 | ++cindex; |
2017 | } | |
91b9a277 | 2018 | |
cb7b593c SH |
2019 | /* Current node exhausted, pop back up */ |
2020 | p = NODE_PARENT(tn); | |
2021 | if (p) { | |
2022 | cindex = tkey_extract_bits(tn->key, p->pos, p->bits)+1; | |
2023 | tn = p; | |
2024 | --iter->depth; | |
2025 | goto rescan; | |
19baf839 | 2026 | } |
cb7b593c SH |
2027 | |
2028 | /* got root? */ | |
2029 | return NULL; | |
19baf839 RO |
2030 | } |
2031 | ||
cb7b593c SH |
2032 | static struct node *fib_trie_get_first(struct fib_trie_iter *iter, |
2033 | struct trie *t) | |
19baf839 | 2034 | { |
cb7b593c | 2035 | struct node *n = rcu_dereference(t->trie); |
19baf839 | 2036 | |
cb7b593c SH |
2037 | if (n && IS_TNODE(n)) { |
2038 | iter->tnode = (struct tnode *) n; | |
2039 | iter->trie = t; | |
2040 | iter->index = 0; | |
1d25cd6c | 2041 | iter->depth = 1; |
cb7b593c | 2042 | return n; |
91b9a277 | 2043 | } |
cb7b593c SH |
2044 | return NULL; |
2045 | } | |
91b9a277 | 2046 | |
cb7b593c SH |
2047 | static void trie_collect_stats(struct trie *t, struct trie_stat *s) |
2048 | { | |
2049 | struct node *n; | |
2050 | struct fib_trie_iter iter; | |
91b9a277 | 2051 | |
cb7b593c | 2052 | memset(s, 0, sizeof(*s)); |
91b9a277 | 2053 | |
cb7b593c SH |
2054 | rcu_read_lock(); |
2055 | for (n = fib_trie_get_first(&iter, t); n; | |
2056 | n = fib_trie_get_next(&iter)) { | |
2057 | if (IS_LEAF(n)) { | |
2058 | s->leaves++; | |
2059 | s->totdepth += iter.depth; | |
2060 | if (iter.depth > s->maxdepth) | |
2061 | s->maxdepth = iter.depth; | |
2062 | } else { | |
2063 | const struct tnode *tn = (const struct tnode *) n; | |
2064 | int i; | |
2065 | ||
2066 | s->tnodes++; | |
2067 | s->nodesizes[tn->bits]++; | |
2068 | for (i = 0; i < (1<<tn->bits); i++) | |
2069 | if (!tn->child[i]) | |
2070 | s->nullpointers++; | |
19baf839 | 2071 | } |
19baf839 | 2072 | } |
2373ce1c | 2073 | rcu_read_unlock(); |
19baf839 RO |
2074 | } |
2075 | ||
cb7b593c SH |
2076 | /* |
2077 | * This outputs /proc/net/fib_triestats | |
2078 | */ | |
2079 | static void trie_show_stats(struct seq_file *seq, struct trie_stat *stat) | |
19baf839 | 2080 | { |
cb7b593c | 2081 | unsigned i, max, pointers, bytes, avdepth; |
c877efb2 | 2082 | |
cb7b593c SH |
2083 | if (stat->leaves) |
2084 | avdepth = stat->totdepth*100 / stat->leaves; | |
2085 | else | |
2086 | avdepth = 0; | |
91b9a277 | 2087 | |
cb7b593c SH |
2088 | seq_printf(seq, "\tAver depth: %d.%02d\n", avdepth / 100, avdepth % 100 ); |
2089 | seq_printf(seq, "\tMax depth: %u\n", stat->maxdepth); | |
91b9a277 | 2090 | |
cb7b593c | 2091 | seq_printf(seq, "\tLeaves: %u\n", stat->leaves); |
91b9a277 | 2092 | |
cb7b593c SH |
2093 | bytes = sizeof(struct leaf) * stat->leaves; |
2094 | seq_printf(seq, "\tInternal nodes: %d\n\t", stat->tnodes); | |
2095 | bytes += sizeof(struct tnode) * stat->tnodes; | |
19baf839 | 2096 | |
cb7b593c SH |
2097 | max = MAX_CHILDS-1; |
2098 | while (max >= 0 && stat->nodesizes[max] == 0) | |
2099 | max--; | |
19baf839 | 2100 | |
cb7b593c SH |
2101 | pointers = 0; |
2102 | for (i = 1; i <= max; i++) | |
2103 | if (stat->nodesizes[i] != 0) { | |
2104 | seq_printf(seq, " %d: %d", i, stat->nodesizes[i]); | |
2105 | pointers += (1<<i) * stat->nodesizes[i]; | |
2106 | } | |
2107 | seq_putc(seq, '\n'); | |
2108 | seq_printf(seq, "\tPointers: %d\n", pointers); | |
2373ce1c | 2109 | |
cb7b593c SH |
2110 | bytes += sizeof(struct node *) * pointers; |
2111 | seq_printf(seq, "Null ptrs: %d\n", stat->nullpointers); | |
2112 | seq_printf(seq, "Total size: %d kB\n", (bytes + 1023) / 1024); | |
2373ce1c | 2113 | |
cb7b593c SH |
2114 | #ifdef CONFIG_IP_FIB_TRIE_STATS |
2115 | seq_printf(seq, "Counters:\n---------\n"); | |
2116 | seq_printf(seq,"gets = %d\n", t->stats.gets); | |
2117 | seq_printf(seq,"backtracks = %d\n", t->stats.backtrack); | |
2118 | seq_printf(seq,"semantic match passed = %d\n", t->stats.semantic_match_passed); | |
2119 | seq_printf(seq,"semantic match miss = %d\n", t->stats.semantic_match_miss); | |
2120 | seq_printf(seq,"null node hit= %d\n", t->stats.null_node_hit); | |
2121 | seq_printf(seq,"skipped node resize = %d\n", t->stats.resize_node_skipped); | |
2122 | #ifdef CLEAR_STATS | |
2123 | memset(&(t->stats), 0, sizeof(t->stats)); | |
2124 | #endif | |
2125 | #endif /* CONFIG_IP_FIB_TRIE_STATS */ | |
2126 | } | |
19baf839 | 2127 | |
cb7b593c SH |
2128 | static int fib_triestat_seq_show(struct seq_file *seq, void *v) |
2129 | { | |
2130 | struct trie_stat *stat; | |
91b9a277 | 2131 | |
cb7b593c SH |
2132 | stat = kmalloc(sizeof(*stat), GFP_KERNEL); |
2133 | if (!stat) | |
2134 | return -ENOMEM; | |
91b9a277 | 2135 | |
cb7b593c SH |
2136 | seq_printf(seq, "Basic info: size of leaf: %Zd bytes, size of tnode: %Zd bytes.\n", |
2137 | sizeof(struct leaf), sizeof(struct tnode)); | |
91b9a277 | 2138 | |
cb7b593c SH |
2139 | if (trie_local) { |
2140 | seq_printf(seq, "Local:\n"); | |
2141 | trie_collect_stats(trie_local, stat); | |
2142 | trie_show_stats(seq, stat); | |
2143 | } | |
91b9a277 | 2144 | |
cb7b593c SH |
2145 | if (trie_main) { |
2146 | seq_printf(seq, "Main:\n"); | |
2147 | trie_collect_stats(trie_main, stat); | |
2148 | trie_show_stats(seq, stat); | |
19baf839 | 2149 | } |
cb7b593c | 2150 | kfree(stat); |
19baf839 | 2151 | |
cb7b593c | 2152 | return 0; |
19baf839 RO |
2153 | } |
2154 | ||
cb7b593c | 2155 | static int fib_triestat_seq_open(struct inode *inode, struct file *file) |
19baf839 | 2156 | { |
cb7b593c | 2157 | return single_open(file, fib_triestat_seq_show, NULL); |
19baf839 RO |
2158 | } |
2159 | ||
cb7b593c SH |
2160 | static struct file_operations fib_triestat_fops = { |
2161 | .owner = THIS_MODULE, | |
2162 | .open = fib_triestat_seq_open, | |
2163 | .read = seq_read, | |
2164 | .llseek = seq_lseek, | |
2165 | .release = single_release, | |
2166 | }; | |
2167 | ||
2168 | static struct node *fib_trie_get_idx(struct fib_trie_iter *iter, | |
2169 | loff_t pos) | |
19baf839 | 2170 | { |
cb7b593c SH |
2171 | loff_t idx = 0; |
2172 | struct node *n; | |
2173 | ||
2174 | for (n = fib_trie_get_first(iter, trie_local); | |
2175 | n; ++idx, n = fib_trie_get_next(iter)) { | |
2176 | if (pos == idx) | |
2177 | return n; | |
2178 | } | |
2179 | ||
2180 | for (n = fib_trie_get_first(iter, trie_main); | |
2181 | n; ++idx, n = fib_trie_get_next(iter)) { | |
2182 | if (pos == idx) | |
2183 | return n; | |
2184 | } | |
19baf839 RO |
2185 | return NULL; |
2186 | } | |
2187 | ||
cb7b593c | 2188 | static void *fib_trie_seq_start(struct seq_file *seq, loff_t *pos) |
19baf839 | 2189 | { |
cb7b593c SH |
2190 | rcu_read_lock(); |
2191 | if (*pos == 0) | |
91b9a277 | 2192 | return SEQ_START_TOKEN; |
cb7b593c | 2193 | return fib_trie_get_idx(seq->private, *pos - 1); |
19baf839 RO |
2194 | } |
2195 | ||
cb7b593c | 2196 | static void *fib_trie_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
19baf839 | 2197 | { |
cb7b593c SH |
2198 | struct fib_trie_iter *iter = seq->private; |
2199 | void *l = v; | |
2200 | ||
19baf839 | 2201 | ++*pos; |
91b9a277 | 2202 | if (v == SEQ_START_TOKEN) |
cb7b593c | 2203 | return fib_trie_get_idx(iter, 0); |
19baf839 | 2204 | |
cb7b593c SH |
2205 | v = fib_trie_get_next(iter); |
2206 | BUG_ON(v == l); | |
2207 | if (v) | |
2208 | return v; | |
19baf839 | 2209 | |
cb7b593c SH |
2210 | /* continue scan in next trie */ |
2211 | if (iter->trie == trie_local) | |
2212 | return fib_trie_get_first(iter, trie_main); | |
19baf839 | 2213 | |
cb7b593c SH |
2214 | return NULL; |
2215 | } | |
19baf839 | 2216 | |
cb7b593c | 2217 | static void fib_trie_seq_stop(struct seq_file *seq, void *v) |
19baf839 | 2218 | { |
cb7b593c SH |
2219 | rcu_read_unlock(); |
2220 | } | |
91b9a277 | 2221 | |
cb7b593c SH |
2222 | static void seq_indent(struct seq_file *seq, int n) |
2223 | { | |
2224 | while (n-- > 0) seq_puts(seq, " "); | |
2225 | } | |
19baf839 | 2226 | |
cb7b593c SH |
2227 | static inline const char *rtn_scope(enum rt_scope_t s) |
2228 | { | |
2229 | static char buf[32]; | |
19baf839 | 2230 | |
cb7b593c SH |
2231 | switch(s) { |
2232 | case RT_SCOPE_UNIVERSE: return "universe"; | |
2233 | case RT_SCOPE_SITE: return "site"; | |
2234 | case RT_SCOPE_LINK: return "link"; | |
2235 | case RT_SCOPE_HOST: return "host"; | |
2236 | case RT_SCOPE_NOWHERE: return "nowhere"; | |
2237 | default: | |
2238 | snprintf(buf, sizeof(buf), "scope=%d", s); | |
2239 | return buf; | |
2240 | } | |
2241 | } | |
19baf839 | 2242 | |
cb7b593c SH |
2243 | static const char *rtn_type_names[__RTN_MAX] = { |
2244 | [RTN_UNSPEC] = "UNSPEC", | |
2245 | [RTN_UNICAST] = "UNICAST", | |
2246 | [RTN_LOCAL] = "LOCAL", | |
2247 | [RTN_BROADCAST] = "BROADCAST", | |
2248 | [RTN_ANYCAST] = "ANYCAST", | |
2249 | [RTN_MULTICAST] = "MULTICAST", | |
2250 | [RTN_BLACKHOLE] = "BLACKHOLE", | |
2251 | [RTN_UNREACHABLE] = "UNREACHABLE", | |
2252 | [RTN_PROHIBIT] = "PROHIBIT", | |
2253 | [RTN_THROW] = "THROW", | |
2254 | [RTN_NAT] = "NAT", | |
2255 | [RTN_XRESOLVE] = "XRESOLVE", | |
2256 | }; | |
19baf839 | 2257 | |
cb7b593c SH |
2258 | static inline const char *rtn_type(unsigned t) |
2259 | { | |
2260 | static char buf[32]; | |
19baf839 | 2261 | |
cb7b593c SH |
2262 | if (t < __RTN_MAX && rtn_type_names[t]) |
2263 | return rtn_type_names[t]; | |
2264 | snprintf(buf, sizeof(buf), "type %d", t); | |
2265 | return buf; | |
19baf839 RO |
2266 | } |
2267 | ||
cb7b593c SH |
2268 | /* Pretty print the trie */ |
2269 | static int fib_trie_seq_show(struct seq_file *seq, void *v) | |
19baf839 | 2270 | { |
cb7b593c SH |
2271 | const struct fib_trie_iter *iter = seq->private; |
2272 | struct node *n = v; | |
c877efb2 | 2273 | |
cb7b593c SH |
2274 | if (v == SEQ_START_TOKEN) |
2275 | return 0; | |
19baf839 | 2276 | |
cb7b593c SH |
2277 | if (IS_TNODE(n)) { |
2278 | struct tnode *tn = (struct tnode *) n; | |
2279 | t_key prf = ntohl(MASK_PFX(tn->key, tn->pos)); | |
91b9a277 | 2280 | |
cb7b593c SH |
2281 | if (!NODE_PARENT(n)) { |
2282 | if (iter->trie == trie_local) | |
2283 | seq_puts(seq, "<local>:\n"); | |
2284 | else | |
2285 | seq_puts(seq, "<main>:\n"); | |
1d25cd6c RO |
2286 | } |
2287 | seq_indent(seq, iter->depth-1); | |
2288 | seq_printf(seq, " +-- %d.%d.%d.%d/%d %d %d %d\n", | |
2289 | NIPQUAD(prf), tn->pos, tn->bits, tn->full_children, | |
2290 | tn->empty_children); | |
2291 | ||
cb7b593c SH |
2292 | } else { |
2293 | struct leaf *l = (struct leaf *) n; | |
2294 | int i; | |
2295 | u32 val = ntohl(l->key); | |
2296 | ||
2297 | seq_indent(seq, iter->depth); | |
2298 | seq_printf(seq, " |-- %d.%d.%d.%d\n", NIPQUAD(val)); | |
2299 | for (i = 32; i >= 0; i--) { | |
772cb712 | 2300 | struct leaf_info *li = find_leaf_info(l, i); |
cb7b593c SH |
2301 | if (li) { |
2302 | struct fib_alias *fa; | |
2303 | list_for_each_entry_rcu(fa, &li->falh, fa_list) { | |
2304 | seq_indent(seq, iter->depth+1); | |
2305 | seq_printf(seq, " /%d %s %s", i, | |
2306 | rtn_scope(fa->fa_scope), | |
2307 | rtn_type(fa->fa_type)); | |
2308 | if (fa->fa_tos) | |
2309 | seq_printf(seq, "tos =%d\n", | |
2310 | fa->fa_tos); | |
2311 | seq_putc(seq, '\n'); | |
2312 | } | |
2313 | } | |
2314 | } | |
19baf839 | 2315 | } |
cb7b593c | 2316 | |
19baf839 RO |
2317 | return 0; |
2318 | } | |
2319 | ||
cb7b593c SH |
2320 | static struct seq_operations fib_trie_seq_ops = { |
2321 | .start = fib_trie_seq_start, | |
2322 | .next = fib_trie_seq_next, | |
2323 | .stop = fib_trie_seq_stop, | |
2324 | .show = fib_trie_seq_show, | |
19baf839 RO |
2325 | }; |
2326 | ||
cb7b593c | 2327 | static int fib_trie_seq_open(struct inode *inode, struct file *file) |
19baf839 RO |
2328 | { |
2329 | struct seq_file *seq; | |
2330 | int rc = -ENOMEM; | |
cb7b593c | 2331 | struct fib_trie_iter *s = kmalloc(sizeof(*s), GFP_KERNEL); |
19baf839 | 2332 | |
cb7b593c SH |
2333 | if (!s) |
2334 | goto out; | |
2335 | ||
2336 | rc = seq_open(file, &fib_trie_seq_ops); | |
19baf839 RO |
2337 | if (rc) |
2338 | goto out_kfree; | |
2339 | ||
cb7b593c SH |
2340 | seq = file->private_data; |
2341 | seq->private = s; | |
2342 | memset(s, 0, sizeof(*s)); | |
19baf839 RO |
2343 | out: |
2344 | return rc; | |
2345 | out_kfree: | |
cb7b593c | 2346 | kfree(s); |
19baf839 RO |
2347 | goto out; |
2348 | } | |
2349 | ||
cb7b593c SH |
2350 | static struct file_operations fib_trie_fops = { |
2351 | .owner = THIS_MODULE, | |
2352 | .open = fib_trie_seq_open, | |
2353 | .read = seq_read, | |
2354 | .llseek = seq_lseek, | |
c877efb2 | 2355 | .release = seq_release_private, |
19baf839 RO |
2356 | }; |
2357 | ||
cb7b593c | 2358 | static unsigned fib_flag_trans(int type, u32 mask, const struct fib_info *fi) |
19baf839 | 2359 | { |
cb7b593c SH |
2360 | static unsigned type2flags[RTN_MAX + 1] = { |
2361 | [7] = RTF_REJECT, [8] = RTF_REJECT, | |
2362 | }; | |
2363 | unsigned flags = type2flags[type]; | |
19baf839 | 2364 | |
cb7b593c SH |
2365 | if (fi && fi->fib_nh->nh_gw) |
2366 | flags |= RTF_GATEWAY; | |
2367 | if (mask == 0xFFFFFFFF) | |
2368 | flags |= RTF_HOST; | |
2369 | flags |= RTF_UP; | |
2370 | return flags; | |
19baf839 RO |
2371 | } |
2372 | ||
cb7b593c SH |
2373 | /* |
2374 | * This outputs /proc/net/route. | |
2375 | * The format of the file is not supposed to be changed | |
2376 | * and needs to be same as fib_hash output to avoid breaking | |
2377 | * legacy utilities | |
2378 | */ | |
2379 | static int fib_route_seq_show(struct seq_file *seq, void *v) | |
19baf839 | 2380 | { |
cb7b593c SH |
2381 | struct leaf *l = v; |
2382 | int i; | |
2383 | char bf[128]; | |
19baf839 | 2384 | |
cb7b593c SH |
2385 | if (v == SEQ_START_TOKEN) { |
2386 | seq_printf(seq, "%-127s\n", "Iface\tDestination\tGateway " | |
2387 | "\tFlags\tRefCnt\tUse\tMetric\tMask\t\tMTU" | |
2388 | "\tWindow\tIRTT"); | |
2389 | return 0; | |
2390 | } | |
19baf839 | 2391 | |
cb7b593c SH |
2392 | if (IS_TNODE(l)) |
2393 | return 0; | |
19baf839 | 2394 | |
cb7b593c | 2395 | for (i=32; i>=0; i--) { |
772cb712 | 2396 | struct leaf_info *li = find_leaf_info(l, i); |
cb7b593c SH |
2397 | struct fib_alias *fa; |
2398 | u32 mask, prefix; | |
91b9a277 | 2399 | |
cb7b593c SH |
2400 | if (!li) |
2401 | continue; | |
19baf839 | 2402 | |
cb7b593c SH |
2403 | mask = inet_make_mask(li->plen); |
2404 | prefix = htonl(l->key); | |
19baf839 | 2405 | |
cb7b593c | 2406 | list_for_each_entry_rcu(fa, &li->falh, fa_list) { |
1371e37d | 2407 | const struct fib_info *fi = fa->fa_info; |
cb7b593c | 2408 | unsigned flags = fib_flag_trans(fa->fa_type, mask, fi); |
19baf839 | 2409 | |
cb7b593c SH |
2410 | if (fa->fa_type == RTN_BROADCAST |
2411 | || fa->fa_type == RTN_MULTICAST) | |
2412 | continue; | |
19baf839 | 2413 | |
cb7b593c SH |
2414 | if (fi) |
2415 | snprintf(bf, sizeof(bf), | |
2416 | "%s\t%08X\t%08X\t%04X\t%d\t%u\t%d\t%08X\t%d\t%u\t%u", | |
2417 | fi->fib_dev ? fi->fib_dev->name : "*", | |
2418 | prefix, | |
2419 | fi->fib_nh->nh_gw, flags, 0, 0, | |
2420 | fi->fib_priority, | |
2421 | mask, | |
2422 | (fi->fib_advmss ? fi->fib_advmss + 40 : 0), | |
2423 | fi->fib_window, | |
2424 | fi->fib_rtt >> 3); | |
2425 | else | |
2426 | snprintf(bf, sizeof(bf), | |
2427 | "*\t%08X\t%08X\t%04X\t%d\t%u\t%d\t%08X\t%d\t%u\t%u", | |
2428 | prefix, 0, flags, 0, 0, 0, | |
2429 | mask, 0, 0, 0); | |
19baf839 | 2430 | |
cb7b593c SH |
2431 | seq_printf(seq, "%-127s\n", bf); |
2432 | } | |
19baf839 RO |
2433 | } |
2434 | ||
2435 | return 0; | |
2436 | } | |
2437 | ||
cb7b593c SH |
2438 | static struct seq_operations fib_route_seq_ops = { |
2439 | .start = fib_trie_seq_start, | |
2440 | .next = fib_trie_seq_next, | |
2441 | .stop = fib_trie_seq_stop, | |
2442 | .show = fib_route_seq_show, | |
19baf839 RO |
2443 | }; |
2444 | ||
cb7b593c | 2445 | static int fib_route_seq_open(struct inode *inode, struct file *file) |
19baf839 RO |
2446 | { |
2447 | struct seq_file *seq; | |
2448 | int rc = -ENOMEM; | |
cb7b593c | 2449 | struct fib_trie_iter *s = kmalloc(sizeof(*s), GFP_KERNEL); |
19baf839 | 2450 | |
cb7b593c SH |
2451 | if (!s) |
2452 | goto out; | |
2453 | ||
2454 | rc = seq_open(file, &fib_route_seq_ops); | |
19baf839 RO |
2455 | if (rc) |
2456 | goto out_kfree; | |
2457 | ||
cb7b593c SH |
2458 | seq = file->private_data; |
2459 | seq->private = s; | |
2460 | memset(s, 0, sizeof(*s)); | |
19baf839 RO |
2461 | out: |
2462 | return rc; | |
2463 | out_kfree: | |
cb7b593c | 2464 | kfree(s); |
19baf839 RO |
2465 | goto out; |
2466 | } | |
2467 | ||
cb7b593c SH |
2468 | static struct file_operations fib_route_fops = { |
2469 | .owner = THIS_MODULE, | |
2470 | .open = fib_route_seq_open, | |
2471 | .read = seq_read, | |
2472 | .llseek = seq_lseek, | |
2473 | .release = seq_release_private, | |
19baf839 RO |
2474 | }; |
2475 | ||
2476 | int __init fib_proc_init(void) | |
2477 | { | |
cb7b593c SH |
2478 | if (!proc_net_fops_create("fib_trie", S_IRUGO, &fib_trie_fops)) |
2479 | goto out1; | |
2480 | ||
2481 | if (!proc_net_fops_create("fib_triestat", S_IRUGO, &fib_triestat_fops)) | |
2482 | goto out2; | |
2483 | ||
2484 | if (!proc_net_fops_create("route", S_IRUGO, &fib_route_fops)) | |
2485 | goto out3; | |
2486 | ||
19baf839 | 2487 | return 0; |
cb7b593c SH |
2488 | |
2489 | out3: | |
2490 | proc_net_remove("fib_triestat"); | |
2491 | out2: | |
2492 | proc_net_remove("fib_trie"); | |
2493 | out1: | |
2494 | return -ENOMEM; | |
19baf839 RO |
2495 | } |
2496 | ||
2497 | void __init fib_proc_exit(void) | |
2498 | { | |
2499 | proc_net_remove("fib_trie"); | |
cb7b593c SH |
2500 | proc_net_remove("fib_triestat"); |
2501 | proc_net_remove("route"); | |
19baf839 RO |
2502 | } |
2503 | ||
2504 | #endif /* CONFIG_PROC_FS */ |