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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 | ||
06ef921d | 85 | #define MAX_STAT_DEPTH 32 |
19baf839 | 86 | |
19baf839 | 87 | #define KEYLENGTH (8*sizeof(t_key)) |
19baf839 | 88 | |
19baf839 RO |
89 | typedef unsigned int t_key; |
90 | ||
91 | #define T_TNODE 0 | |
92 | #define T_LEAF 1 | |
93 | #define NODE_TYPE_MASK 0x1UL | |
2373ce1c RO |
94 | #define NODE_TYPE(node) ((node)->parent & NODE_TYPE_MASK) |
95 | ||
91b9a277 OJ |
96 | #define IS_TNODE(n) (!(n->parent & T_LEAF)) |
97 | #define IS_LEAF(n) (n->parent & T_LEAF) | |
19baf839 RO |
98 | |
99 | struct node { | |
91b9a277 OJ |
100 | t_key key; |
101 | unsigned long parent; | |
19baf839 RO |
102 | }; |
103 | ||
104 | struct leaf { | |
91b9a277 OJ |
105 | t_key key; |
106 | unsigned long parent; | |
19baf839 | 107 | struct hlist_head list; |
2373ce1c | 108 | struct rcu_head rcu; |
19baf839 RO |
109 | }; |
110 | ||
111 | struct leaf_info { | |
112 | struct hlist_node hlist; | |
2373ce1c | 113 | struct rcu_head rcu; |
19baf839 RO |
114 | int plen; |
115 | struct list_head falh; | |
116 | }; | |
117 | ||
118 | struct tnode { | |
91b9a277 OJ |
119 | t_key key; |
120 | unsigned long parent; | |
121 | unsigned short pos:5; /* 2log(KEYLENGTH) bits needed */ | |
122 | unsigned short bits:5; /* 2log(KEYLENGTH) bits needed */ | |
123 | unsigned short full_children; /* KEYLENGTH bits needed */ | |
124 | unsigned short empty_children; /* KEYLENGTH bits needed */ | |
2373ce1c | 125 | struct rcu_head rcu; |
91b9a277 | 126 | struct node *child[0]; |
19baf839 RO |
127 | }; |
128 | ||
129 | #ifdef CONFIG_IP_FIB_TRIE_STATS | |
130 | struct trie_use_stats { | |
131 | unsigned int gets; | |
132 | unsigned int backtrack; | |
133 | unsigned int semantic_match_passed; | |
134 | unsigned int semantic_match_miss; | |
135 | unsigned int null_node_hit; | |
2f36895a | 136 | unsigned int resize_node_skipped; |
19baf839 RO |
137 | }; |
138 | #endif | |
139 | ||
140 | struct trie_stat { | |
141 | unsigned int totdepth; | |
142 | unsigned int maxdepth; | |
143 | unsigned int tnodes; | |
144 | unsigned int leaves; | |
145 | unsigned int nullpointers; | |
06ef921d | 146 | unsigned int nodesizes[MAX_STAT_DEPTH]; |
c877efb2 | 147 | }; |
19baf839 RO |
148 | |
149 | struct trie { | |
91b9a277 | 150 | struct node *trie; |
19baf839 RO |
151 | #ifdef CONFIG_IP_FIB_TRIE_STATS |
152 | struct trie_use_stats stats; | |
153 | #endif | |
91b9a277 | 154 | int size; |
19baf839 RO |
155 | }; |
156 | ||
19baf839 RO |
157 | static void put_child(struct trie *t, struct tnode *tn, int i, struct node *n); |
158 | static void tnode_put_child_reorg(struct tnode *tn, int i, struct node *n, int wasfull); | |
19baf839 | 159 | static struct node *resize(struct trie *t, struct tnode *tn); |
2f80b3c8 RO |
160 | static struct tnode *inflate(struct trie *t, struct tnode *tn); |
161 | static struct tnode *halve(struct trie *t, struct tnode *tn); | |
19baf839 | 162 | static void tnode_free(struct tnode *tn); |
19baf839 | 163 | |
e18b890b | 164 | static struct kmem_cache *fn_alias_kmem __read_mostly; |
19baf839 | 165 | |
06801916 SH |
166 | static inline struct tnode *node_parent(struct node *node) |
167 | { | |
168 | struct tnode *ret; | |
169 | ||
170 | ret = (struct tnode *)(node->parent & ~NODE_TYPE_MASK); | |
171 | return rcu_dereference(ret); | |
172 | } | |
173 | ||
174 | static inline void node_set_parent(struct node *node, struct tnode *ptr) | |
175 | { | |
176 | rcu_assign_pointer(node->parent, | |
177 | (unsigned long)ptr | NODE_TYPE(node)); | |
178 | } | |
2373ce1c RO |
179 | |
180 | /* rcu_read_lock needs to be hold by caller from readside */ | |
181 | ||
c877efb2 | 182 | static inline struct node *tnode_get_child(struct tnode *tn, int i) |
19baf839 | 183 | { |
91b9a277 | 184 | BUG_ON(i >= 1 << tn->bits); |
19baf839 | 185 | |
2373ce1c | 186 | return rcu_dereference(tn->child[i]); |
19baf839 RO |
187 | } |
188 | ||
bb435b8d | 189 | static inline int tnode_child_length(const struct tnode *tn) |
19baf839 | 190 | { |
91b9a277 | 191 | return 1 << tn->bits; |
19baf839 RO |
192 | } |
193 | ||
ab66b4a7 SH |
194 | static inline t_key mask_pfx(t_key k, unsigned short l) |
195 | { | |
196 | return (l == 0) ? 0 : k >> (KEYLENGTH-l) << (KEYLENGTH-l); | |
197 | } | |
198 | ||
19baf839 RO |
199 | static inline t_key tkey_extract_bits(t_key a, int offset, int bits) |
200 | { | |
91b9a277 | 201 | if (offset < KEYLENGTH) |
19baf839 | 202 | return ((t_key)(a << offset)) >> (KEYLENGTH - bits); |
91b9a277 | 203 | else |
19baf839 RO |
204 | return 0; |
205 | } | |
206 | ||
207 | static inline int tkey_equals(t_key a, t_key b) | |
208 | { | |
c877efb2 | 209 | return a == b; |
19baf839 RO |
210 | } |
211 | ||
212 | static inline int tkey_sub_equals(t_key a, int offset, int bits, t_key b) | |
213 | { | |
c877efb2 SH |
214 | if (bits == 0 || offset >= KEYLENGTH) |
215 | return 1; | |
91b9a277 OJ |
216 | bits = bits > KEYLENGTH ? KEYLENGTH : bits; |
217 | return ((a ^ b) << offset) >> (KEYLENGTH - bits) == 0; | |
c877efb2 | 218 | } |
19baf839 RO |
219 | |
220 | static inline int tkey_mismatch(t_key a, int offset, t_key b) | |
221 | { | |
222 | t_key diff = a ^ b; | |
223 | int i = offset; | |
224 | ||
c877efb2 SH |
225 | if (!diff) |
226 | return 0; | |
227 | while ((diff << i) >> (KEYLENGTH-1) == 0) | |
19baf839 RO |
228 | i++; |
229 | return i; | |
230 | } | |
231 | ||
19baf839 | 232 | /* |
e905a9ed YH |
233 | To understand this stuff, an understanding of keys and all their bits is |
234 | necessary. Every node in the trie has a key associated with it, but not | |
19baf839 RO |
235 | all of the bits in that key are significant. |
236 | ||
237 | Consider a node 'n' and its parent 'tp'. | |
238 | ||
e905a9ed YH |
239 | If n is a leaf, every bit in its key is significant. Its presence is |
240 | necessitated by path compression, since during a tree traversal (when | |
241 | searching for a leaf - unless we are doing an insertion) we will completely | |
242 | ignore all skipped bits we encounter. Thus we need to verify, at the end of | |
243 | a potentially successful search, that we have indeed been walking the | |
19baf839 RO |
244 | correct key path. |
245 | ||
e905a9ed YH |
246 | Note that we can never "miss" the correct key in the tree if present by |
247 | following the wrong path. Path compression ensures that segments of the key | |
248 | that are the same for all keys with a given prefix are skipped, but the | |
249 | skipped part *is* identical for each node in the subtrie below the skipped | |
250 | bit! trie_insert() in this implementation takes care of that - note the | |
19baf839 RO |
251 | call to tkey_sub_equals() in trie_insert(). |
252 | ||
e905a9ed | 253 | if n is an internal node - a 'tnode' here, the various parts of its key |
19baf839 RO |
254 | have many different meanings. |
255 | ||
e905a9ed | 256 | Example: |
19baf839 RO |
257 | _________________________________________________________________ |
258 | | i | i | i | i | i | i | i | N | N | N | S | S | S | S | S | C | | |
259 | ----------------------------------------------------------------- | |
e905a9ed | 260 | 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 |
19baf839 RO |
261 | |
262 | _________________________________________________________________ | |
263 | | C | C | C | u | u | u | u | u | u | u | u | u | u | u | u | u | | |
264 | ----------------------------------------------------------------- | |
265 | 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 | |
266 | ||
267 | tp->pos = 7 | |
268 | tp->bits = 3 | |
269 | n->pos = 15 | |
91b9a277 | 270 | n->bits = 4 |
19baf839 | 271 | |
e905a9ed YH |
272 | First, let's just ignore the bits that come before the parent tp, that is |
273 | the bits from 0 to (tp->pos-1). They are *known* but at this point we do | |
19baf839 RO |
274 | not use them for anything. |
275 | ||
276 | The bits from (tp->pos) to (tp->pos + tp->bits - 1) - "N", above - are the | |
e905a9ed | 277 | index into the parent's child array. That is, they will be used to find |
19baf839 RO |
278 | 'n' among tp's children. |
279 | ||
280 | The bits from (tp->pos + tp->bits) to (n->pos - 1) - "S" - are skipped bits | |
281 | for the node n. | |
282 | ||
e905a9ed | 283 | All the bits we have seen so far are significant to the node n. The rest |
19baf839 RO |
284 | of the bits are really not needed or indeed known in n->key. |
285 | ||
e905a9ed | 286 | The bits from (n->pos) to (n->pos + n->bits - 1) - "C" - are the index into |
19baf839 | 287 | n's child array, and will of course be different for each child. |
e905a9ed | 288 | |
c877efb2 | 289 | |
19baf839 RO |
290 | The rest of the bits, from (n->pos + n->bits) onward, are completely unknown |
291 | at this point. | |
292 | ||
293 | */ | |
294 | ||
0c7770c7 | 295 | static inline void check_tnode(const struct tnode *tn) |
19baf839 | 296 | { |
0c7770c7 | 297 | WARN_ON(tn && tn->pos+tn->bits > 32); |
19baf839 RO |
298 | } |
299 | ||
f5026fab DL |
300 | static const int halve_threshold = 25; |
301 | static const int inflate_threshold = 50; | |
302 | static const int halve_threshold_root = 8; | |
303 | static const int inflate_threshold_root = 15; | |
19baf839 | 304 | |
2373ce1c RO |
305 | |
306 | static void __alias_free_mem(struct rcu_head *head) | |
19baf839 | 307 | { |
2373ce1c RO |
308 | struct fib_alias *fa = container_of(head, struct fib_alias, rcu); |
309 | kmem_cache_free(fn_alias_kmem, fa); | |
19baf839 RO |
310 | } |
311 | ||
2373ce1c | 312 | static inline void alias_free_mem_rcu(struct fib_alias *fa) |
19baf839 | 313 | { |
2373ce1c RO |
314 | call_rcu(&fa->rcu, __alias_free_mem); |
315 | } | |
91b9a277 | 316 | |
2373ce1c RO |
317 | static void __leaf_free_rcu(struct rcu_head *head) |
318 | { | |
319 | kfree(container_of(head, struct leaf, rcu)); | |
320 | } | |
91b9a277 | 321 | |
2373ce1c | 322 | static void __leaf_info_free_rcu(struct rcu_head *head) |
19baf839 | 323 | { |
2373ce1c | 324 | kfree(container_of(head, struct leaf_info, rcu)); |
19baf839 RO |
325 | } |
326 | ||
2373ce1c | 327 | static inline void free_leaf_info(struct leaf_info *leaf) |
19baf839 | 328 | { |
2373ce1c | 329 | call_rcu(&leaf->rcu, __leaf_info_free_rcu); |
19baf839 RO |
330 | } |
331 | ||
f0e36f8c PM |
332 | static struct tnode *tnode_alloc(unsigned int size) |
333 | { | |
2373ce1c RO |
334 | struct page *pages; |
335 | ||
336 | if (size <= PAGE_SIZE) | |
337 | return kcalloc(size, 1, GFP_KERNEL); | |
338 | ||
339 | pages = alloc_pages(GFP_KERNEL|__GFP_ZERO, get_order(size)); | |
340 | if (!pages) | |
341 | return NULL; | |
342 | ||
343 | return page_address(pages); | |
f0e36f8c PM |
344 | } |
345 | ||
2373ce1c | 346 | static void __tnode_free_rcu(struct rcu_head *head) |
f0e36f8c | 347 | { |
2373ce1c | 348 | struct tnode *tn = container_of(head, struct tnode, rcu); |
f0e36f8c | 349 | unsigned int size = sizeof(struct tnode) + |
2373ce1c | 350 | (1 << tn->bits) * sizeof(struct node *); |
f0e36f8c PM |
351 | |
352 | if (size <= PAGE_SIZE) | |
353 | kfree(tn); | |
354 | else | |
355 | free_pages((unsigned long)tn, get_order(size)); | |
356 | } | |
357 | ||
2373ce1c RO |
358 | static inline void tnode_free(struct tnode *tn) |
359 | { | |
132adf54 | 360 | if (IS_LEAF(tn)) { |
550e29bc RO |
361 | struct leaf *l = (struct leaf *) tn; |
362 | call_rcu_bh(&l->rcu, __leaf_free_rcu); | |
132adf54 | 363 | } else |
550e29bc | 364 | call_rcu(&tn->rcu, __tnode_free_rcu); |
2373ce1c RO |
365 | } |
366 | ||
367 | static struct leaf *leaf_new(void) | |
368 | { | |
369 | struct leaf *l = kmalloc(sizeof(struct leaf), GFP_KERNEL); | |
370 | if (l) { | |
371 | l->parent = T_LEAF; | |
372 | INIT_HLIST_HEAD(&l->list); | |
373 | } | |
374 | return l; | |
375 | } | |
376 | ||
377 | static struct leaf_info *leaf_info_new(int plen) | |
378 | { | |
379 | struct leaf_info *li = kmalloc(sizeof(struct leaf_info), GFP_KERNEL); | |
380 | if (li) { | |
381 | li->plen = plen; | |
382 | INIT_LIST_HEAD(&li->falh); | |
383 | } | |
384 | return li; | |
385 | } | |
386 | ||
19baf839 RO |
387 | static struct tnode* tnode_new(t_key key, int pos, int bits) |
388 | { | |
389 | int nchildren = 1<<bits; | |
390 | int sz = sizeof(struct tnode) + nchildren * sizeof(struct node *); | |
f0e36f8c | 391 | struct tnode *tn = tnode_alloc(sz); |
19baf839 | 392 | |
91b9a277 | 393 | if (tn) { |
19baf839 | 394 | memset(tn, 0, sz); |
2373ce1c | 395 | tn->parent = T_TNODE; |
19baf839 RO |
396 | tn->pos = pos; |
397 | tn->bits = bits; | |
398 | tn->key = key; | |
399 | tn->full_children = 0; | |
400 | tn->empty_children = 1<<bits; | |
401 | } | |
c877efb2 | 402 | |
0c7770c7 SH |
403 | pr_debug("AT %p s=%u %u\n", tn, (unsigned int) sizeof(struct tnode), |
404 | (unsigned int) (sizeof(struct node) * 1<<bits)); | |
19baf839 RO |
405 | return tn; |
406 | } | |
407 | ||
19baf839 RO |
408 | /* |
409 | * Check whether a tnode 'n' is "full", i.e. it is an internal node | |
410 | * and no bits are skipped. See discussion in dyntree paper p. 6 | |
411 | */ | |
412 | ||
bb435b8d | 413 | static inline int tnode_full(const struct tnode *tn, const struct node *n) |
19baf839 | 414 | { |
c877efb2 | 415 | if (n == NULL || IS_LEAF(n)) |
19baf839 RO |
416 | return 0; |
417 | ||
418 | return ((struct tnode *) n)->pos == tn->pos + tn->bits; | |
419 | } | |
420 | ||
c877efb2 | 421 | static inline void put_child(struct trie *t, struct tnode *tn, int i, struct node *n) |
19baf839 RO |
422 | { |
423 | tnode_put_child_reorg(tn, i, n, -1); | |
424 | } | |
425 | ||
c877efb2 | 426 | /* |
19baf839 RO |
427 | * Add a child at position i overwriting the old value. |
428 | * Update the value of full_children and empty_children. | |
429 | */ | |
430 | ||
c877efb2 | 431 | static void tnode_put_child_reorg(struct tnode *tn, int i, struct node *n, int wasfull) |
19baf839 | 432 | { |
2373ce1c | 433 | struct node *chi = tn->child[i]; |
19baf839 RO |
434 | int isfull; |
435 | ||
0c7770c7 SH |
436 | BUG_ON(i >= 1<<tn->bits); |
437 | ||
19baf839 RO |
438 | |
439 | /* update emptyChildren */ | |
440 | if (n == NULL && chi != NULL) | |
441 | tn->empty_children++; | |
442 | else if (n != NULL && chi == NULL) | |
443 | tn->empty_children--; | |
c877efb2 | 444 | |
19baf839 | 445 | /* update fullChildren */ |
91b9a277 | 446 | if (wasfull == -1) |
19baf839 RO |
447 | wasfull = tnode_full(tn, chi); |
448 | ||
449 | isfull = tnode_full(tn, n); | |
c877efb2 | 450 | if (wasfull && !isfull) |
19baf839 | 451 | tn->full_children--; |
c877efb2 | 452 | else if (!wasfull && isfull) |
19baf839 | 453 | tn->full_children++; |
91b9a277 | 454 | |
c877efb2 | 455 | if (n) |
06801916 | 456 | node_set_parent(n, tn); |
19baf839 | 457 | |
2373ce1c | 458 | rcu_assign_pointer(tn->child[i], n); |
19baf839 RO |
459 | } |
460 | ||
c877efb2 | 461 | static struct node *resize(struct trie *t, struct tnode *tn) |
19baf839 RO |
462 | { |
463 | int i; | |
2f36895a | 464 | int err = 0; |
2f80b3c8 | 465 | struct tnode *old_tn; |
e6308be8 RO |
466 | int inflate_threshold_use; |
467 | int halve_threshold_use; | |
05eee48c | 468 | int max_resize; |
19baf839 | 469 | |
e905a9ed | 470 | if (!tn) |
19baf839 RO |
471 | return NULL; |
472 | ||
0c7770c7 SH |
473 | pr_debug("In tnode_resize %p inflate_threshold=%d threshold=%d\n", |
474 | tn, inflate_threshold, halve_threshold); | |
19baf839 RO |
475 | |
476 | /* No children */ | |
477 | if (tn->empty_children == tnode_child_length(tn)) { | |
478 | tnode_free(tn); | |
479 | return NULL; | |
480 | } | |
481 | /* One child */ | |
482 | if (tn->empty_children == tnode_child_length(tn) - 1) | |
483 | for (i = 0; i < tnode_child_length(tn); i++) { | |
91b9a277 | 484 | struct node *n; |
19baf839 | 485 | |
91b9a277 | 486 | n = tn->child[i]; |
2373ce1c | 487 | if (!n) |
91b9a277 | 488 | continue; |
91b9a277 OJ |
489 | |
490 | /* compress one level */ | |
06801916 | 491 | node_set_parent(n, NULL); |
91b9a277 OJ |
492 | tnode_free(tn); |
493 | return n; | |
19baf839 | 494 | } |
c877efb2 | 495 | /* |
19baf839 RO |
496 | * Double as long as the resulting node has a number of |
497 | * nonempty nodes that are above the threshold. | |
498 | */ | |
499 | ||
500 | /* | |
c877efb2 SH |
501 | * From "Implementing a dynamic compressed trie" by Stefan Nilsson of |
502 | * the Helsinki University of Technology and Matti Tikkanen of Nokia | |
19baf839 | 503 | * Telecommunications, page 6: |
c877efb2 | 504 | * "A node is doubled if the ratio of non-empty children to all |
19baf839 RO |
505 | * children in the *doubled* node is at least 'high'." |
506 | * | |
c877efb2 SH |
507 | * 'high' in this instance is the variable 'inflate_threshold'. It |
508 | * is expressed as a percentage, so we multiply it with | |
509 | * tnode_child_length() and instead of multiplying by 2 (since the | |
510 | * child array will be doubled by inflate()) and multiplying | |
511 | * the left-hand side by 100 (to handle the percentage thing) we | |
19baf839 | 512 | * multiply the left-hand side by 50. |
c877efb2 SH |
513 | * |
514 | * The left-hand side may look a bit weird: tnode_child_length(tn) | |
515 | * - tn->empty_children is of course the number of non-null children | |
516 | * in the current node. tn->full_children is the number of "full" | |
19baf839 | 517 | * children, that is non-null tnodes with a skip value of 0. |
c877efb2 | 518 | * All of those will be doubled in the resulting inflated tnode, so |
19baf839 | 519 | * we just count them one extra time here. |
c877efb2 | 520 | * |
19baf839 | 521 | * A clearer way to write this would be: |
c877efb2 | 522 | * |
19baf839 | 523 | * to_be_doubled = tn->full_children; |
c877efb2 | 524 | * not_to_be_doubled = tnode_child_length(tn) - tn->empty_children - |
19baf839 RO |
525 | * tn->full_children; |
526 | * | |
527 | * new_child_length = tnode_child_length(tn) * 2; | |
528 | * | |
c877efb2 | 529 | * new_fill_factor = 100 * (not_to_be_doubled + 2*to_be_doubled) / |
19baf839 RO |
530 | * new_child_length; |
531 | * if (new_fill_factor >= inflate_threshold) | |
c877efb2 SH |
532 | * |
533 | * ...and so on, tho it would mess up the while () loop. | |
534 | * | |
19baf839 RO |
535 | * anyway, |
536 | * 100 * (not_to_be_doubled + 2*to_be_doubled) / new_child_length >= | |
537 | * inflate_threshold | |
c877efb2 | 538 | * |
19baf839 RO |
539 | * avoid a division: |
540 | * 100 * (not_to_be_doubled + 2*to_be_doubled) >= | |
541 | * inflate_threshold * new_child_length | |
c877efb2 | 542 | * |
19baf839 | 543 | * expand not_to_be_doubled and to_be_doubled, and shorten: |
c877efb2 | 544 | * 100 * (tnode_child_length(tn) - tn->empty_children + |
91b9a277 | 545 | * tn->full_children) >= inflate_threshold * new_child_length |
c877efb2 | 546 | * |
19baf839 | 547 | * expand new_child_length: |
c877efb2 | 548 | * 100 * (tnode_child_length(tn) - tn->empty_children + |
91b9a277 | 549 | * tn->full_children) >= |
19baf839 | 550 | * inflate_threshold * tnode_child_length(tn) * 2 |
c877efb2 | 551 | * |
19baf839 | 552 | * shorten again: |
c877efb2 | 553 | * 50 * (tn->full_children + tnode_child_length(tn) - |
91b9a277 | 554 | * tn->empty_children) >= inflate_threshold * |
19baf839 | 555 | * tnode_child_length(tn) |
c877efb2 | 556 | * |
19baf839 RO |
557 | */ |
558 | ||
559 | check_tnode(tn); | |
c877efb2 | 560 | |
e6308be8 RO |
561 | /* Keep root node larger */ |
562 | ||
132adf54 | 563 | if (!tn->parent) |
e6308be8 | 564 | inflate_threshold_use = inflate_threshold_root; |
e905a9ed | 565 | else |
e6308be8 RO |
566 | inflate_threshold_use = inflate_threshold; |
567 | ||
2f36895a | 568 | err = 0; |
05eee48c RO |
569 | max_resize = 10; |
570 | while ((tn->full_children > 0 && max_resize-- && | |
19baf839 | 571 | 50 * (tn->full_children + tnode_child_length(tn) - tn->empty_children) >= |
e6308be8 | 572 | inflate_threshold_use * tnode_child_length(tn))) { |
19baf839 | 573 | |
2f80b3c8 RO |
574 | old_tn = tn; |
575 | tn = inflate(t, tn); | |
576 | if (IS_ERR(tn)) { | |
577 | tn = old_tn; | |
2f36895a RO |
578 | #ifdef CONFIG_IP_FIB_TRIE_STATS |
579 | t->stats.resize_node_skipped++; | |
580 | #endif | |
581 | break; | |
582 | } | |
19baf839 RO |
583 | } |
584 | ||
05eee48c RO |
585 | if (max_resize < 0) { |
586 | if (!tn->parent) | |
587 | printk(KERN_WARNING "Fix inflate_threshold_root. Now=%d size=%d bits\n", | |
588 | inflate_threshold_root, tn->bits); | |
589 | else | |
590 | printk(KERN_WARNING "Fix inflate_threshold. Now=%d size=%d bits\n", | |
591 | inflate_threshold, tn->bits); | |
592 | } | |
593 | ||
19baf839 RO |
594 | check_tnode(tn); |
595 | ||
596 | /* | |
597 | * Halve as long as the number of empty children in this | |
598 | * node is above threshold. | |
599 | */ | |
2f36895a | 600 | |
e6308be8 RO |
601 | |
602 | /* Keep root node larger */ | |
603 | ||
132adf54 | 604 | if (!tn->parent) |
e6308be8 | 605 | halve_threshold_use = halve_threshold_root; |
e905a9ed | 606 | else |
e6308be8 RO |
607 | halve_threshold_use = halve_threshold; |
608 | ||
2f36895a | 609 | err = 0; |
05eee48c RO |
610 | max_resize = 10; |
611 | while (tn->bits > 1 && max_resize-- && | |
19baf839 | 612 | 100 * (tnode_child_length(tn) - tn->empty_children) < |
e6308be8 | 613 | halve_threshold_use * tnode_child_length(tn)) { |
2f36895a | 614 | |
2f80b3c8 RO |
615 | old_tn = tn; |
616 | tn = halve(t, tn); | |
617 | if (IS_ERR(tn)) { | |
618 | tn = old_tn; | |
2f36895a RO |
619 | #ifdef CONFIG_IP_FIB_TRIE_STATS |
620 | t->stats.resize_node_skipped++; | |
621 | #endif | |
622 | break; | |
623 | } | |
624 | } | |
19baf839 | 625 | |
05eee48c RO |
626 | if (max_resize < 0) { |
627 | if (!tn->parent) | |
628 | printk(KERN_WARNING "Fix halve_threshold_root. Now=%d size=%d bits\n", | |
629 | halve_threshold_root, tn->bits); | |
630 | else | |
631 | printk(KERN_WARNING "Fix halve_threshold. Now=%d size=%d bits\n", | |
632 | halve_threshold, tn->bits); | |
633 | } | |
c877efb2 | 634 | |
19baf839 | 635 | /* Only one child remains */ |
19baf839 RO |
636 | if (tn->empty_children == tnode_child_length(tn) - 1) |
637 | for (i = 0; i < tnode_child_length(tn); i++) { | |
91b9a277 | 638 | struct node *n; |
19baf839 | 639 | |
91b9a277 | 640 | n = tn->child[i]; |
2373ce1c | 641 | if (!n) |
91b9a277 | 642 | continue; |
91b9a277 OJ |
643 | |
644 | /* compress one level */ | |
645 | ||
06801916 | 646 | node_set_parent(n, NULL); |
91b9a277 OJ |
647 | tnode_free(tn); |
648 | return n; | |
19baf839 RO |
649 | } |
650 | ||
651 | return (struct node *) tn; | |
652 | } | |
653 | ||
2f80b3c8 | 654 | static struct tnode *inflate(struct trie *t, struct tnode *tn) |
19baf839 | 655 | { |
19baf839 RO |
656 | struct tnode *oldtnode = tn; |
657 | int olen = tnode_child_length(tn); | |
658 | int i; | |
659 | ||
0c7770c7 | 660 | pr_debug("In inflate\n"); |
19baf839 RO |
661 | |
662 | tn = tnode_new(oldtnode->key, oldtnode->pos, oldtnode->bits + 1); | |
663 | ||
0c7770c7 | 664 | if (!tn) |
2f80b3c8 | 665 | return ERR_PTR(-ENOMEM); |
2f36895a RO |
666 | |
667 | /* | |
c877efb2 SH |
668 | * Preallocate and store tnodes before the actual work so we |
669 | * don't get into an inconsistent state if memory allocation | |
670 | * fails. In case of failure we return the oldnode and inflate | |
2f36895a RO |
671 | * of tnode is ignored. |
672 | */ | |
91b9a277 OJ |
673 | |
674 | for (i = 0; i < olen; i++) { | |
2f36895a RO |
675 | struct tnode *inode = (struct tnode *) tnode_get_child(oldtnode, i); |
676 | ||
677 | if (inode && | |
678 | IS_TNODE(inode) && | |
679 | inode->pos == oldtnode->pos + oldtnode->bits && | |
680 | inode->bits > 1) { | |
681 | struct tnode *left, *right; | |
ab66b4a7 | 682 | t_key m = ~0U << (KEYLENGTH - 1) >> inode->pos; |
c877efb2 | 683 | |
2f36895a RO |
684 | left = tnode_new(inode->key&(~m), inode->pos + 1, |
685 | inode->bits - 1); | |
2f80b3c8 RO |
686 | if (!left) |
687 | goto nomem; | |
91b9a277 | 688 | |
2f36895a RO |
689 | right = tnode_new(inode->key|m, inode->pos + 1, |
690 | inode->bits - 1); | |
691 | ||
e905a9ed | 692 | if (!right) { |
2f80b3c8 RO |
693 | tnode_free(left); |
694 | goto nomem; | |
e905a9ed | 695 | } |
2f36895a RO |
696 | |
697 | put_child(t, tn, 2*i, (struct node *) left); | |
698 | put_child(t, tn, 2*i+1, (struct node *) right); | |
699 | } | |
700 | } | |
701 | ||
91b9a277 | 702 | for (i = 0; i < olen; i++) { |
c95aaf9a | 703 | struct tnode *inode; |
19baf839 | 704 | struct node *node = tnode_get_child(oldtnode, i); |
91b9a277 OJ |
705 | struct tnode *left, *right; |
706 | int size, j; | |
c877efb2 | 707 | |
19baf839 RO |
708 | /* An empty child */ |
709 | if (node == NULL) | |
710 | continue; | |
711 | ||
712 | /* A leaf or an internal node with skipped bits */ | |
713 | ||
c877efb2 | 714 | if (IS_LEAF(node) || ((struct tnode *) node)->pos > |
19baf839 | 715 | tn->pos + tn->bits - 1) { |
c877efb2 | 716 | if (tkey_extract_bits(node->key, oldtnode->pos + oldtnode->bits, |
19baf839 RO |
717 | 1) == 0) |
718 | put_child(t, tn, 2*i, node); | |
719 | else | |
720 | put_child(t, tn, 2*i+1, node); | |
721 | continue; | |
722 | } | |
723 | ||
724 | /* An internal node with two children */ | |
725 | inode = (struct tnode *) node; | |
726 | ||
727 | if (inode->bits == 1) { | |
728 | put_child(t, tn, 2*i, inode->child[0]); | |
729 | put_child(t, tn, 2*i+1, inode->child[1]); | |
730 | ||
731 | tnode_free(inode); | |
91b9a277 | 732 | continue; |
19baf839 RO |
733 | } |
734 | ||
91b9a277 OJ |
735 | /* An internal node with more than two children */ |
736 | ||
737 | /* We will replace this node 'inode' with two new | |
738 | * ones, 'left' and 'right', each with half of the | |
739 | * original children. The two new nodes will have | |
740 | * a position one bit further down the key and this | |
741 | * means that the "significant" part of their keys | |
742 | * (see the discussion near the top of this file) | |
743 | * will differ by one bit, which will be "0" in | |
744 | * left's key and "1" in right's key. Since we are | |
745 | * moving the key position by one step, the bit that | |
746 | * we are moving away from - the bit at position | |
747 | * (inode->pos) - is the one that will differ between | |
748 | * left and right. So... we synthesize that bit in the | |
749 | * two new keys. | |
750 | * The mask 'm' below will be a single "one" bit at | |
751 | * the position (inode->pos) | |
752 | */ | |
19baf839 | 753 | |
91b9a277 OJ |
754 | /* Use the old key, but set the new significant |
755 | * bit to zero. | |
756 | */ | |
2f36895a | 757 | |
91b9a277 OJ |
758 | left = (struct tnode *) tnode_get_child(tn, 2*i); |
759 | put_child(t, tn, 2*i, NULL); | |
2f36895a | 760 | |
91b9a277 | 761 | BUG_ON(!left); |
2f36895a | 762 | |
91b9a277 OJ |
763 | right = (struct tnode *) tnode_get_child(tn, 2*i+1); |
764 | put_child(t, tn, 2*i+1, NULL); | |
19baf839 | 765 | |
91b9a277 | 766 | BUG_ON(!right); |
19baf839 | 767 | |
91b9a277 OJ |
768 | size = tnode_child_length(left); |
769 | for (j = 0; j < size; j++) { | |
770 | put_child(t, left, j, inode->child[j]); | |
771 | put_child(t, right, j, inode->child[j + size]); | |
19baf839 | 772 | } |
91b9a277 OJ |
773 | put_child(t, tn, 2*i, resize(t, left)); |
774 | put_child(t, tn, 2*i+1, resize(t, right)); | |
775 | ||
776 | tnode_free(inode); | |
19baf839 RO |
777 | } |
778 | tnode_free(oldtnode); | |
779 | return tn; | |
2f80b3c8 RO |
780 | nomem: |
781 | { | |
782 | int size = tnode_child_length(tn); | |
783 | int j; | |
784 | ||
0c7770c7 | 785 | for (j = 0; j < size; j++) |
2f80b3c8 RO |
786 | if (tn->child[j]) |
787 | tnode_free((struct tnode *)tn->child[j]); | |
788 | ||
789 | tnode_free(tn); | |
0c7770c7 | 790 | |
2f80b3c8 RO |
791 | return ERR_PTR(-ENOMEM); |
792 | } | |
19baf839 RO |
793 | } |
794 | ||
2f80b3c8 | 795 | static struct tnode *halve(struct trie *t, struct tnode *tn) |
19baf839 RO |
796 | { |
797 | struct tnode *oldtnode = tn; | |
798 | struct node *left, *right; | |
799 | int i; | |
800 | int olen = tnode_child_length(tn); | |
801 | ||
0c7770c7 | 802 | pr_debug("In halve\n"); |
c877efb2 SH |
803 | |
804 | tn = tnode_new(oldtnode->key, oldtnode->pos, oldtnode->bits - 1); | |
19baf839 | 805 | |
2f80b3c8 RO |
806 | if (!tn) |
807 | return ERR_PTR(-ENOMEM); | |
2f36895a RO |
808 | |
809 | /* | |
c877efb2 SH |
810 | * Preallocate and store tnodes before the actual work so we |
811 | * don't get into an inconsistent state if memory allocation | |
812 | * fails. In case of failure we return the oldnode and halve | |
2f36895a RO |
813 | * of tnode is ignored. |
814 | */ | |
815 | ||
91b9a277 | 816 | for (i = 0; i < olen; i += 2) { |
2f36895a RO |
817 | left = tnode_get_child(oldtnode, i); |
818 | right = tnode_get_child(oldtnode, i+1); | |
c877efb2 | 819 | |
2f36895a | 820 | /* Two nonempty children */ |
0c7770c7 | 821 | if (left && right) { |
2f80b3c8 | 822 | struct tnode *newn; |
0c7770c7 | 823 | |
2f80b3c8 | 824 | newn = tnode_new(left->key, tn->pos + tn->bits, 1); |
0c7770c7 SH |
825 | |
826 | if (!newn) | |
2f80b3c8 | 827 | goto nomem; |
0c7770c7 | 828 | |
2f80b3c8 | 829 | put_child(t, tn, i/2, (struct node *)newn); |
2f36895a | 830 | } |
2f36895a | 831 | |
2f36895a | 832 | } |
19baf839 | 833 | |
91b9a277 OJ |
834 | for (i = 0; i < olen; i += 2) { |
835 | struct tnode *newBinNode; | |
836 | ||
19baf839 RO |
837 | left = tnode_get_child(oldtnode, i); |
838 | right = tnode_get_child(oldtnode, i+1); | |
c877efb2 | 839 | |
19baf839 RO |
840 | /* At least one of the children is empty */ |
841 | if (left == NULL) { | |
842 | if (right == NULL) /* Both are empty */ | |
843 | continue; | |
844 | put_child(t, tn, i/2, right); | |
91b9a277 | 845 | continue; |
0c7770c7 | 846 | } |
91b9a277 OJ |
847 | |
848 | if (right == NULL) { | |
19baf839 | 849 | put_child(t, tn, i/2, left); |
91b9a277 OJ |
850 | continue; |
851 | } | |
c877efb2 | 852 | |
19baf839 | 853 | /* Two nonempty children */ |
91b9a277 OJ |
854 | newBinNode = (struct tnode *) tnode_get_child(tn, i/2); |
855 | put_child(t, tn, i/2, NULL); | |
91b9a277 OJ |
856 | put_child(t, newBinNode, 0, left); |
857 | put_child(t, newBinNode, 1, right); | |
858 | put_child(t, tn, i/2, resize(t, newBinNode)); | |
19baf839 RO |
859 | } |
860 | tnode_free(oldtnode); | |
861 | return tn; | |
2f80b3c8 RO |
862 | nomem: |
863 | { | |
864 | int size = tnode_child_length(tn); | |
865 | int j; | |
866 | ||
0c7770c7 | 867 | for (j = 0; j < size; j++) |
2f80b3c8 RO |
868 | if (tn->child[j]) |
869 | tnode_free((struct tnode *)tn->child[j]); | |
870 | ||
871 | tnode_free(tn); | |
0c7770c7 | 872 | |
2f80b3c8 RO |
873 | return ERR_PTR(-ENOMEM); |
874 | } | |
19baf839 RO |
875 | } |
876 | ||
772cb712 | 877 | /* readside must use rcu_read_lock currently dump routines |
2373ce1c RO |
878 | via get_fa_head and dump */ |
879 | ||
772cb712 | 880 | static struct leaf_info *find_leaf_info(struct leaf *l, int plen) |
19baf839 | 881 | { |
772cb712 | 882 | struct hlist_head *head = &l->list; |
19baf839 RO |
883 | struct hlist_node *node; |
884 | struct leaf_info *li; | |
885 | ||
2373ce1c | 886 | hlist_for_each_entry_rcu(li, node, head, hlist) |
c877efb2 | 887 | if (li->plen == plen) |
19baf839 | 888 | return li; |
91b9a277 | 889 | |
19baf839 RO |
890 | return NULL; |
891 | } | |
892 | ||
893 | static inline struct list_head * get_fa_head(struct leaf *l, int plen) | |
894 | { | |
772cb712 | 895 | struct leaf_info *li = find_leaf_info(l, plen); |
c877efb2 | 896 | |
91b9a277 OJ |
897 | if (!li) |
898 | return NULL; | |
c877efb2 | 899 | |
91b9a277 | 900 | return &li->falh; |
19baf839 RO |
901 | } |
902 | ||
903 | static void insert_leaf_info(struct hlist_head *head, struct leaf_info *new) | |
904 | { | |
e905a9ed YH |
905 | struct leaf_info *li = NULL, *last = NULL; |
906 | struct hlist_node *node; | |
907 | ||
908 | if (hlist_empty(head)) { | |
909 | hlist_add_head_rcu(&new->hlist, head); | |
910 | } else { | |
911 | hlist_for_each_entry(li, node, head, hlist) { | |
912 | if (new->plen > li->plen) | |
913 | break; | |
914 | ||
915 | last = li; | |
916 | } | |
917 | if (last) | |
918 | hlist_add_after_rcu(&last->hlist, &new->hlist); | |
919 | else | |
920 | hlist_add_before_rcu(&new->hlist, &li->hlist); | |
921 | } | |
19baf839 RO |
922 | } |
923 | ||
2373ce1c RO |
924 | /* rcu_read_lock needs to be hold by caller from readside */ |
925 | ||
19baf839 RO |
926 | static struct leaf * |
927 | fib_find_node(struct trie *t, u32 key) | |
928 | { | |
929 | int pos; | |
930 | struct tnode *tn; | |
931 | struct node *n; | |
932 | ||
933 | pos = 0; | |
2373ce1c | 934 | n = rcu_dereference(t->trie); |
19baf839 RO |
935 | |
936 | while (n != NULL && NODE_TYPE(n) == T_TNODE) { | |
937 | tn = (struct tnode *) n; | |
91b9a277 | 938 | |
19baf839 | 939 | check_tnode(tn); |
91b9a277 | 940 | |
c877efb2 | 941 | if (tkey_sub_equals(tn->key, pos, tn->pos-pos, key)) { |
91b9a277 | 942 | pos = tn->pos + tn->bits; |
19baf839 | 943 | n = tnode_get_child(tn, tkey_extract_bits(key, tn->pos, tn->bits)); |
91b9a277 | 944 | } else |
19baf839 RO |
945 | break; |
946 | } | |
947 | /* Case we have found a leaf. Compare prefixes */ | |
948 | ||
91b9a277 OJ |
949 | if (n != NULL && IS_LEAF(n) && tkey_equals(key, n->key)) |
950 | return (struct leaf *)n; | |
951 | ||
19baf839 RO |
952 | return NULL; |
953 | } | |
954 | ||
955 | static struct node *trie_rebalance(struct trie *t, struct tnode *tn) | |
956 | { | |
19baf839 | 957 | int wasfull; |
06801916 SH |
958 | t_key cindex, key = tn->key; |
959 | struct tnode *tp; | |
19baf839 | 960 | |
06801916 | 961 | while (tn != NULL && (tp = node_parent((struct node *)tn)) != NULL) { |
19baf839 RO |
962 | cindex = tkey_extract_bits(key, tp->pos, tp->bits); |
963 | wasfull = tnode_full(tp, tnode_get_child(tp, cindex)); | |
964 | tn = (struct tnode *) resize (t, (struct tnode *)tn); | |
965 | tnode_put_child_reorg((struct tnode *)tp, cindex,(struct node*)tn, wasfull); | |
91b9a277 | 966 | |
06801916 SH |
967 | tp = node_parent((struct node *) tn); |
968 | if (!tp) | |
19baf839 | 969 | break; |
06801916 | 970 | tn = tp; |
19baf839 | 971 | } |
06801916 | 972 | |
19baf839 | 973 | /* Handle last (top) tnode */ |
c877efb2 | 974 | if (IS_TNODE(tn)) |
19baf839 RO |
975 | tn = (struct tnode*) resize(t, (struct tnode *)tn); |
976 | ||
977 | return (struct node*) tn; | |
978 | } | |
979 | ||
2373ce1c RO |
980 | /* only used from updater-side */ |
981 | ||
fea86ad8 | 982 | static struct list_head *fib_insert_node(struct trie *t, u32 key, int plen) |
19baf839 RO |
983 | { |
984 | int pos, newpos; | |
985 | struct tnode *tp = NULL, *tn = NULL; | |
986 | struct node *n; | |
987 | struct leaf *l; | |
988 | int missbit; | |
c877efb2 | 989 | struct list_head *fa_head = NULL; |
19baf839 RO |
990 | struct leaf_info *li; |
991 | t_key cindex; | |
992 | ||
993 | pos = 0; | |
c877efb2 | 994 | n = t->trie; |
19baf839 | 995 | |
c877efb2 SH |
996 | /* If we point to NULL, stop. Either the tree is empty and we should |
997 | * just put a new leaf in if, or we have reached an empty child slot, | |
19baf839 | 998 | * and we should just put our new leaf in that. |
c877efb2 SH |
999 | * If we point to a T_TNODE, check if it matches our key. Note that |
1000 | * a T_TNODE might be skipping any number of bits - its 'pos' need | |
19baf839 RO |
1001 | * not be the parent's 'pos'+'bits'! |
1002 | * | |
c877efb2 | 1003 | * If it does match the current key, get pos/bits from it, extract |
19baf839 RO |
1004 | * the index from our key, push the T_TNODE and walk the tree. |
1005 | * | |
1006 | * If it doesn't, we have to replace it with a new T_TNODE. | |
1007 | * | |
c877efb2 SH |
1008 | * If we point to a T_LEAF, it might or might not have the same key |
1009 | * as we do. If it does, just change the value, update the T_LEAF's | |
1010 | * value, and return it. | |
19baf839 RO |
1011 | * If it doesn't, we need to replace it with a T_TNODE. |
1012 | */ | |
1013 | ||
1014 | while (n != NULL && NODE_TYPE(n) == T_TNODE) { | |
1015 | tn = (struct tnode *) n; | |
91b9a277 | 1016 | |
c877efb2 | 1017 | check_tnode(tn); |
91b9a277 | 1018 | |
c877efb2 | 1019 | if (tkey_sub_equals(tn->key, pos, tn->pos-pos, key)) { |
19baf839 | 1020 | tp = tn; |
91b9a277 | 1021 | pos = tn->pos + tn->bits; |
19baf839 RO |
1022 | n = tnode_get_child(tn, tkey_extract_bits(key, tn->pos, tn->bits)); |
1023 | ||
06801916 | 1024 | BUG_ON(n && node_parent(n) != tn); |
91b9a277 | 1025 | } else |
19baf839 RO |
1026 | break; |
1027 | } | |
1028 | ||
1029 | /* | |
1030 | * n ----> NULL, LEAF or TNODE | |
1031 | * | |
c877efb2 | 1032 | * tp is n's (parent) ----> NULL or TNODE |
19baf839 RO |
1033 | */ |
1034 | ||
91b9a277 | 1035 | BUG_ON(tp && IS_LEAF(tp)); |
19baf839 RO |
1036 | |
1037 | /* Case 1: n is a leaf. Compare prefixes */ | |
1038 | ||
c877efb2 | 1039 | if (n != NULL && IS_LEAF(n) && tkey_equals(key, n->key)) { |
c95aaf9a | 1040 | l = (struct leaf *) n; |
19baf839 | 1041 | li = leaf_info_new(plen); |
91b9a277 | 1042 | |
fea86ad8 SH |
1043 | if (!li) |
1044 | return NULL; | |
19baf839 RO |
1045 | |
1046 | fa_head = &li->falh; | |
1047 | insert_leaf_info(&l->list, li); | |
1048 | goto done; | |
1049 | } | |
1050 | t->size++; | |
1051 | l = leaf_new(); | |
1052 | ||
fea86ad8 SH |
1053 | if (!l) |
1054 | return NULL; | |
19baf839 RO |
1055 | |
1056 | l->key = key; | |
1057 | li = leaf_info_new(plen); | |
1058 | ||
c877efb2 | 1059 | if (!li) { |
f835e471 | 1060 | tnode_free((struct tnode *) l); |
fea86ad8 | 1061 | return NULL; |
f835e471 | 1062 | } |
19baf839 RO |
1063 | |
1064 | fa_head = &li->falh; | |
1065 | insert_leaf_info(&l->list, li); | |
1066 | ||
19baf839 | 1067 | if (t->trie && n == NULL) { |
91b9a277 | 1068 | /* Case 2: n is NULL, and will just insert a new leaf */ |
19baf839 | 1069 | |
06801916 | 1070 | node_set_parent((struct node *)l, tp); |
19baf839 | 1071 | |
91b9a277 OJ |
1072 | cindex = tkey_extract_bits(key, tp->pos, tp->bits); |
1073 | put_child(t, (struct tnode *)tp, cindex, (struct node *)l); | |
1074 | } else { | |
1075 | /* Case 3: n is a LEAF or a TNODE and the key doesn't match. */ | |
c877efb2 SH |
1076 | /* |
1077 | * Add a new tnode here | |
19baf839 RO |
1078 | * first tnode need some special handling |
1079 | */ | |
1080 | ||
1081 | if (tp) | |
91b9a277 | 1082 | pos = tp->pos+tp->bits; |
19baf839 | 1083 | else |
91b9a277 OJ |
1084 | pos = 0; |
1085 | ||
c877efb2 | 1086 | if (n) { |
19baf839 RO |
1087 | newpos = tkey_mismatch(key, pos, n->key); |
1088 | tn = tnode_new(n->key, newpos, 1); | |
91b9a277 | 1089 | } else { |
19baf839 | 1090 | newpos = 0; |
c877efb2 | 1091 | tn = tnode_new(key, newpos, 1); /* First tnode */ |
19baf839 | 1092 | } |
19baf839 | 1093 | |
c877efb2 | 1094 | if (!tn) { |
f835e471 RO |
1095 | free_leaf_info(li); |
1096 | tnode_free((struct tnode *) l); | |
fea86ad8 | 1097 | return NULL; |
91b9a277 OJ |
1098 | } |
1099 | ||
06801916 | 1100 | node_set_parent((struct node *)tn, tp); |
19baf839 | 1101 | |
91b9a277 | 1102 | missbit = tkey_extract_bits(key, newpos, 1); |
19baf839 RO |
1103 | put_child(t, tn, missbit, (struct node *)l); |
1104 | put_child(t, tn, 1-missbit, n); | |
1105 | ||
c877efb2 | 1106 | if (tp) { |
19baf839 RO |
1107 | cindex = tkey_extract_bits(key, tp->pos, tp->bits); |
1108 | put_child(t, (struct tnode *)tp, cindex, (struct node *)tn); | |
91b9a277 | 1109 | } else { |
2373ce1c | 1110 | rcu_assign_pointer(t->trie, (struct node *)tn); /* First tnode */ |
19baf839 RO |
1111 | tp = tn; |
1112 | } | |
1113 | } | |
91b9a277 OJ |
1114 | |
1115 | if (tp && tp->pos + tp->bits > 32) | |
78c6671a | 1116 | printk(KERN_WARNING "fib_trie tp=%p pos=%d, bits=%d, key=%0x plen=%d\n", |
19baf839 | 1117 | tp, tp->pos, tp->bits, key, plen); |
91b9a277 | 1118 | |
19baf839 | 1119 | /* Rebalance the trie */ |
2373ce1c RO |
1120 | |
1121 | rcu_assign_pointer(t->trie, trie_rebalance(t, tp)); | |
f835e471 | 1122 | done: |
19baf839 RO |
1123 | return fa_head; |
1124 | } | |
1125 | ||
d562f1f8 RO |
1126 | /* |
1127 | * Caller must hold RTNL. | |
1128 | */ | |
4e902c57 | 1129 | static int fn_trie_insert(struct fib_table *tb, struct fib_config *cfg) |
19baf839 RO |
1130 | { |
1131 | struct trie *t = (struct trie *) tb->tb_data; | |
1132 | struct fib_alias *fa, *new_fa; | |
c877efb2 | 1133 | struct list_head *fa_head = NULL; |
19baf839 | 1134 | struct fib_info *fi; |
4e902c57 TG |
1135 | int plen = cfg->fc_dst_len; |
1136 | u8 tos = cfg->fc_tos; | |
19baf839 RO |
1137 | u32 key, mask; |
1138 | int err; | |
1139 | struct leaf *l; | |
1140 | ||
1141 | if (plen > 32) | |
1142 | return -EINVAL; | |
1143 | ||
4e902c57 | 1144 | key = ntohl(cfg->fc_dst); |
19baf839 | 1145 | |
2dfe55b4 | 1146 | pr_debug("Insert table=%u %08x/%d\n", tb->tb_id, key, plen); |
19baf839 | 1147 | |
91b9a277 | 1148 | mask = ntohl(inet_make_mask(plen)); |
19baf839 | 1149 | |
c877efb2 | 1150 | if (key & ~mask) |
19baf839 RO |
1151 | return -EINVAL; |
1152 | ||
1153 | key = key & mask; | |
1154 | ||
4e902c57 TG |
1155 | fi = fib_create_info(cfg); |
1156 | if (IS_ERR(fi)) { | |
1157 | err = PTR_ERR(fi); | |
19baf839 | 1158 | goto err; |
4e902c57 | 1159 | } |
19baf839 RO |
1160 | |
1161 | l = fib_find_node(t, key); | |
c877efb2 | 1162 | fa = NULL; |
19baf839 | 1163 | |
c877efb2 | 1164 | if (l) { |
19baf839 RO |
1165 | fa_head = get_fa_head(l, plen); |
1166 | fa = fib_find_alias(fa_head, tos, fi->fib_priority); | |
1167 | } | |
1168 | ||
1169 | /* Now fa, if non-NULL, points to the first fib alias | |
1170 | * with the same keys [prefix,tos,priority], if such key already | |
1171 | * exists or to the node before which we will insert new one. | |
1172 | * | |
1173 | * If fa is NULL, we will need to allocate a new one and | |
1174 | * insert to the head of f. | |
1175 | * | |
1176 | * If f is NULL, no fib node matched the destination key | |
1177 | * and we need to allocate a new one of those as well. | |
1178 | */ | |
1179 | ||
91b9a277 | 1180 | if (fa && fa->fa_info->fib_priority == fi->fib_priority) { |
19baf839 RO |
1181 | struct fib_alias *fa_orig; |
1182 | ||
1183 | err = -EEXIST; | |
4e902c57 | 1184 | if (cfg->fc_nlflags & NLM_F_EXCL) |
19baf839 RO |
1185 | goto out; |
1186 | ||
4e902c57 | 1187 | if (cfg->fc_nlflags & NLM_F_REPLACE) { |
19baf839 RO |
1188 | struct fib_info *fi_drop; |
1189 | u8 state; | |
1190 | ||
6725033f JP |
1191 | if (fi->fib_treeref > 1) |
1192 | goto out; | |
1193 | ||
2373ce1c | 1194 | err = -ENOBUFS; |
e94b1766 | 1195 | new_fa = kmem_cache_alloc(fn_alias_kmem, GFP_KERNEL); |
2373ce1c RO |
1196 | if (new_fa == NULL) |
1197 | goto out; | |
19baf839 RO |
1198 | |
1199 | fi_drop = fa->fa_info; | |
2373ce1c RO |
1200 | new_fa->fa_tos = fa->fa_tos; |
1201 | new_fa->fa_info = fi; | |
4e902c57 TG |
1202 | new_fa->fa_type = cfg->fc_type; |
1203 | new_fa->fa_scope = cfg->fc_scope; | |
19baf839 | 1204 | state = fa->fa_state; |
2373ce1c | 1205 | new_fa->fa_state &= ~FA_S_ACCESSED; |
19baf839 | 1206 | |
2373ce1c RO |
1207 | list_replace_rcu(&fa->fa_list, &new_fa->fa_list); |
1208 | alias_free_mem_rcu(fa); | |
19baf839 RO |
1209 | |
1210 | fib_release_info(fi_drop); | |
1211 | if (state & FA_S_ACCESSED) | |
91b9a277 | 1212 | rt_cache_flush(-1); |
b8f55831 MK |
1213 | rtmsg_fib(RTM_NEWROUTE, htonl(key), new_fa, plen, |
1214 | tb->tb_id, &cfg->fc_nlinfo, NLM_F_REPLACE); | |
19baf839 | 1215 | |
91b9a277 | 1216 | goto succeeded; |
19baf839 RO |
1217 | } |
1218 | /* Error if we find a perfect match which | |
1219 | * uses the same scope, type, and nexthop | |
1220 | * information. | |
1221 | */ | |
1222 | fa_orig = fa; | |
1223 | list_for_each_entry(fa, fa_orig->fa_list.prev, fa_list) { | |
1224 | if (fa->fa_tos != tos) | |
1225 | break; | |
1226 | if (fa->fa_info->fib_priority != fi->fib_priority) | |
1227 | break; | |
4e902c57 TG |
1228 | if (fa->fa_type == cfg->fc_type && |
1229 | fa->fa_scope == cfg->fc_scope && | |
19baf839 RO |
1230 | fa->fa_info == fi) { |
1231 | goto out; | |
1232 | } | |
1233 | } | |
4e902c57 | 1234 | if (!(cfg->fc_nlflags & NLM_F_APPEND)) |
19baf839 RO |
1235 | fa = fa_orig; |
1236 | } | |
1237 | err = -ENOENT; | |
4e902c57 | 1238 | if (!(cfg->fc_nlflags & NLM_F_CREATE)) |
19baf839 RO |
1239 | goto out; |
1240 | ||
1241 | err = -ENOBUFS; | |
e94b1766 | 1242 | new_fa = kmem_cache_alloc(fn_alias_kmem, GFP_KERNEL); |
19baf839 RO |
1243 | if (new_fa == NULL) |
1244 | goto out; | |
1245 | ||
1246 | new_fa->fa_info = fi; | |
1247 | new_fa->fa_tos = tos; | |
4e902c57 TG |
1248 | new_fa->fa_type = cfg->fc_type; |
1249 | new_fa->fa_scope = cfg->fc_scope; | |
19baf839 | 1250 | new_fa->fa_state = 0; |
19baf839 RO |
1251 | /* |
1252 | * Insert new entry to the list. | |
1253 | */ | |
1254 | ||
c877efb2 | 1255 | if (!fa_head) { |
fea86ad8 SH |
1256 | fa_head = fib_insert_node(t, key, plen); |
1257 | if (unlikely(!fa_head)) { | |
1258 | err = -ENOMEM; | |
f835e471 | 1259 | goto out_free_new_fa; |
fea86ad8 | 1260 | } |
f835e471 | 1261 | } |
19baf839 | 1262 | |
2373ce1c RO |
1263 | list_add_tail_rcu(&new_fa->fa_list, |
1264 | (fa ? &fa->fa_list : fa_head)); | |
19baf839 RO |
1265 | |
1266 | rt_cache_flush(-1); | |
4e902c57 | 1267 | rtmsg_fib(RTM_NEWROUTE, htonl(key), new_fa, plen, tb->tb_id, |
b8f55831 | 1268 | &cfg->fc_nlinfo, 0); |
19baf839 RO |
1269 | succeeded: |
1270 | return 0; | |
f835e471 RO |
1271 | |
1272 | out_free_new_fa: | |
1273 | kmem_cache_free(fn_alias_kmem, new_fa); | |
19baf839 RO |
1274 | out: |
1275 | fib_release_info(fi); | |
91b9a277 | 1276 | err: |
19baf839 RO |
1277 | return err; |
1278 | } | |
1279 | ||
2373ce1c | 1280 | |
772cb712 | 1281 | /* should be called with rcu_read_lock */ |
0c7770c7 SH |
1282 | static inline int check_leaf(struct trie *t, struct leaf *l, |
1283 | t_key key, int *plen, const struct flowi *flp, | |
06c74270 | 1284 | struct fib_result *res) |
19baf839 | 1285 | { |
06c74270 | 1286 | int err, i; |
888454c5 | 1287 | __be32 mask; |
19baf839 RO |
1288 | struct leaf_info *li; |
1289 | struct hlist_head *hhead = &l->list; | |
1290 | struct hlist_node *node; | |
c877efb2 | 1291 | |
2373ce1c | 1292 | hlist_for_each_entry_rcu(li, node, hhead, hlist) { |
19baf839 | 1293 | i = li->plen; |
888454c5 AV |
1294 | mask = inet_make_mask(i); |
1295 | if (l->key != (key & ntohl(mask))) | |
19baf839 RO |
1296 | continue; |
1297 | ||
888454c5 | 1298 | if ((err = fib_semantic_match(&li->falh, flp, res, htonl(l->key), mask, i)) <= 0) { |
19baf839 RO |
1299 | *plen = i; |
1300 | #ifdef CONFIG_IP_FIB_TRIE_STATS | |
1301 | t->stats.semantic_match_passed++; | |
1302 | #endif | |
06c74270 | 1303 | return err; |
19baf839 RO |
1304 | } |
1305 | #ifdef CONFIG_IP_FIB_TRIE_STATS | |
1306 | t->stats.semantic_match_miss++; | |
1307 | #endif | |
1308 | } | |
06c74270 | 1309 | return 1; |
19baf839 RO |
1310 | } |
1311 | ||
1312 | static int | |
1313 | fn_trie_lookup(struct fib_table *tb, const struct flowi *flp, struct fib_result *res) | |
1314 | { | |
1315 | struct trie *t = (struct trie *) tb->tb_data; | |
1316 | int plen, ret = 0; | |
1317 | struct node *n; | |
1318 | struct tnode *pn; | |
1319 | int pos, bits; | |
91b9a277 | 1320 | t_key key = ntohl(flp->fl4_dst); |
19baf839 RO |
1321 | int chopped_off; |
1322 | t_key cindex = 0; | |
1323 | int current_prefix_length = KEYLENGTH; | |
91b9a277 OJ |
1324 | struct tnode *cn; |
1325 | t_key node_prefix, key_prefix, pref_mismatch; | |
1326 | int mp; | |
1327 | ||
2373ce1c | 1328 | rcu_read_lock(); |
91b9a277 | 1329 | |
2373ce1c | 1330 | n = rcu_dereference(t->trie); |
c877efb2 | 1331 | if (!n) |
19baf839 RO |
1332 | goto failed; |
1333 | ||
1334 | #ifdef CONFIG_IP_FIB_TRIE_STATS | |
1335 | t->stats.gets++; | |
1336 | #endif | |
1337 | ||
1338 | /* Just a leaf? */ | |
1339 | if (IS_LEAF(n)) { | |
06c74270 | 1340 | if ((ret = check_leaf(t, (struct leaf *)n, key, &plen, flp, res)) <= 0) |
19baf839 RO |
1341 | goto found; |
1342 | goto failed; | |
1343 | } | |
1344 | pn = (struct tnode *) n; | |
1345 | chopped_off = 0; | |
c877efb2 | 1346 | |
91b9a277 | 1347 | while (pn) { |
19baf839 RO |
1348 | pos = pn->pos; |
1349 | bits = pn->bits; | |
1350 | ||
c877efb2 | 1351 | if (!chopped_off) |
ab66b4a7 SH |
1352 | cindex = tkey_extract_bits(mask_pfx(key, current_prefix_length), |
1353 | pos, bits); | |
19baf839 RO |
1354 | |
1355 | n = tnode_get_child(pn, cindex); | |
1356 | ||
1357 | if (n == NULL) { | |
1358 | #ifdef CONFIG_IP_FIB_TRIE_STATS | |
1359 | t->stats.null_node_hit++; | |
1360 | #endif | |
1361 | goto backtrace; | |
1362 | } | |
1363 | ||
91b9a277 OJ |
1364 | if (IS_LEAF(n)) { |
1365 | if ((ret = check_leaf(t, (struct leaf *)n, key, &plen, flp, res)) <= 0) | |
1366 | goto found; | |
1367 | else | |
1368 | goto backtrace; | |
1369 | } | |
1370 | ||
19baf839 RO |
1371 | #define HL_OPTIMIZE |
1372 | #ifdef HL_OPTIMIZE | |
91b9a277 | 1373 | cn = (struct tnode *)n; |
19baf839 | 1374 | |
91b9a277 OJ |
1375 | /* |
1376 | * It's a tnode, and we can do some extra checks here if we | |
1377 | * like, to avoid descending into a dead-end branch. | |
1378 | * This tnode is in the parent's child array at index | |
1379 | * key[p_pos..p_pos+p_bits] but potentially with some bits | |
1380 | * chopped off, so in reality the index may be just a | |
1381 | * subprefix, padded with zero at the end. | |
1382 | * We can also take a look at any skipped bits in this | |
1383 | * tnode - everything up to p_pos is supposed to be ok, | |
1384 | * and the non-chopped bits of the index (se previous | |
1385 | * paragraph) are also guaranteed ok, but the rest is | |
1386 | * considered unknown. | |
1387 | * | |
1388 | * The skipped bits are key[pos+bits..cn->pos]. | |
1389 | */ | |
19baf839 | 1390 | |
91b9a277 OJ |
1391 | /* If current_prefix_length < pos+bits, we are already doing |
1392 | * actual prefix matching, which means everything from | |
1393 | * pos+(bits-chopped_off) onward must be zero along some | |
1394 | * branch of this subtree - otherwise there is *no* valid | |
1395 | * prefix present. Here we can only check the skipped | |
1396 | * bits. Remember, since we have already indexed into the | |
1397 | * parent's child array, we know that the bits we chopped of | |
1398 | * *are* zero. | |
1399 | */ | |
19baf839 | 1400 | |
91b9a277 | 1401 | /* NOTA BENE: CHECKING ONLY SKIPPED BITS FOR THE NEW NODE HERE */ |
19baf839 | 1402 | |
91b9a277 OJ |
1403 | if (current_prefix_length < pos+bits) { |
1404 | if (tkey_extract_bits(cn->key, current_prefix_length, | |
1405 | cn->pos - current_prefix_length) != 0 || | |
1406 | !(cn->child[0])) | |
1407 | goto backtrace; | |
1408 | } | |
19baf839 | 1409 | |
91b9a277 OJ |
1410 | /* |
1411 | * If chopped_off=0, the index is fully validated and we | |
1412 | * only need to look at the skipped bits for this, the new, | |
1413 | * tnode. What we actually want to do is to find out if | |
1414 | * these skipped bits match our key perfectly, or if we will | |
1415 | * have to count on finding a matching prefix further down, | |
1416 | * because if we do, we would like to have some way of | |
1417 | * verifying the existence of such a prefix at this point. | |
1418 | */ | |
19baf839 | 1419 | |
91b9a277 OJ |
1420 | /* The only thing we can do at this point is to verify that |
1421 | * any such matching prefix can indeed be a prefix to our | |
1422 | * key, and if the bits in the node we are inspecting that | |
1423 | * do not match our key are not ZERO, this cannot be true. | |
1424 | * Thus, find out where there is a mismatch (before cn->pos) | |
1425 | * and verify that all the mismatching bits are zero in the | |
1426 | * new tnode's key. | |
1427 | */ | |
19baf839 | 1428 | |
91b9a277 OJ |
1429 | /* Note: We aren't very concerned about the piece of the key |
1430 | * that precede pn->pos+pn->bits, since these have already been | |
1431 | * checked. The bits after cn->pos aren't checked since these are | |
1432 | * by definition "unknown" at this point. Thus, what we want to | |
1433 | * see is if we are about to enter the "prefix matching" state, | |
1434 | * and in that case verify that the skipped bits that will prevail | |
1435 | * throughout this subtree are zero, as they have to be if we are | |
1436 | * to find a matching prefix. | |
1437 | */ | |
1438 | ||
ab66b4a7 SH |
1439 | node_prefix = mask_pfx(cn->key, cn->pos); |
1440 | key_prefix = mask_pfx(key, cn->pos); | |
91b9a277 OJ |
1441 | pref_mismatch = key_prefix^node_prefix; |
1442 | mp = 0; | |
1443 | ||
1444 | /* In short: If skipped bits in this node do not match the search | |
1445 | * key, enter the "prefix matching" state.directly. | |
1446 | */ | |
1447 | if (pref_mismatch) { | |
1448 | while (!(pref_mismatch & (1<<(KEYLENGTH-1)))) { | |
1449 | mp++; | |
1450 | pref_mismatch = pref_mismatch <<1; | |
1451 | } | |
1452 | key_prefix = tkey_extract_bits(cn->key, mp, cn->pos-mp); | |
1453 | ||
1454 | if (key_prefix != 0) | |
1455 | goto backtrace; | |
1456 | ||
1457 | if (current_prefix_length >= cn->pos) | |
1458 | current_prefix_length = mp; | |
c877efb2 | 1459 | } |
91b9a277 OJ |
1460 | #endif |
1461 | pn = (struct tnode *)n; /* Descend */ | |
1462 | chopped_off = 0; | |
1463 | continue; | |
1464 | ||
19baf839 RO |
1465 | backtrace: |
1466 | chopped_off++; | |
1467 | ||
1468 | /* As zero don't change the child key (cindex) */ | |
91b9a277 | 1469 | while ((chopped_off <= pn->bits) && !(cindex & (1<<(chopped_off-1)))) |
19baf839 | 1470 | chopped_off++; |
19baf839 RO |
1471 | |
1472 | /* Decrease current_... with bits chopped off */ | |
1473 | if (current_prefix_length > pn->pos + pn->bits - chopped_off) | |
1474 | current_prefix_length = pn->pos + pn->bits - chopped_off; | |
91b9a277 | 1475 | |
19baf839 | 1476 | /* |
c877efb2 | 1477 | * Either we do the actual chop off according or if we have |
19baf839 RO |
1478 | * chopped off all bits in this tnode walk up to our parent. |
1479 | */ | |
1480 | ||
91b9a277 | 1481 | if (chopped_off <= pn->bits) { |
19baf839 | 1482 | cindex &= ~(1 << (chopped_off-1)); |
91b9a277 | 1483 | } else { |
06801916 SH |
1484 | struct tnode *parent = node_parent((struct node *) pn); |
1485 | if (!parent) | |
19baf839 | 1486 | goto failed; |
91b9a277 | 1487 | |
19baf839 | 1488 | /* Get Child's index */ |
06801916 SH |
1489 | cindex = tkey_extract_bits(pn->key, parent->pos, parent->bits); |
1490 | pn = parent; | |
19baf839 RO |
1491 | chopped_off = 0; |
1492 | ||
1493 | #ifdef CONFIG_IP_FIB_TRIE_STATS | |
1494 | t->stats.backtrack++; | |
1495 | #endif | |
1496 | goto backtrace; | |
c877efb2 | 1497 | } |
19baf839 RO |
1498 | } |
1499 | failed: | |
c877efb2 | 1500 | ret = 1; |
19baf839 | 1501 | found: |
2373ce1c | 1502 | rcu_read_unlock(); |
19baf839 RO |
1503 | return ret; |
1504 | } | |
1505 | ||
2373ce1c | 1506 | /* only called from updater side */ |
19baf839 RO |
1507 | static int trie_leaf_remove(struct trie *t, t_key key) |
1508 | { | |
1509 | t_key cindex; | |
1510 | struct tnode *tp = NULL; | |
1511 | struct node *n = t->trie; | |
1512 | struct leaf *l; | |
1513 | ||
0c7770c7 | 1514 | pr_debug("entering trie_leaf_remove(%p)\n", n); |
19baf839 RO |
1515 | |
1516 | /* Note that in the case skipped bits, those bits are *not* checked! | |
c877efb2 | 1517 | * When we finish this, we will have NULL or a T_LEAF, and the |
19baf839 RO |
1518 | * T_LEAF may or may not match our key. |
1519 | */ | |
1520 | ||
91b9a277 | 1521 | while (n != NULL && IS_TNODE(n)) { |
19baf839 RO |
1522 | struct tnode *tn = (struct tnode *) n; |
1523 | check_tnode(tn); | |
1524 | n = tnode_get_child(tn ,tkey_extract_bits(key, tn->pos, tn->bits)); | |
1525 | ||
06801916 | 1526 | BUG_ON(n && node_parent(n) != tn); |
91b9a277 | 1527 | } |
19baf839 RO |
1528 | l = (struct leaf *) n; |
1529 | ||
c877efb2 | 1530 | if (!n || !tkey_equals(l->key, key)) |
19baf839 | 1531 | return 0; |
c877efb2 SH |
1532 | |
1533 | /* | |
1534 | * Key found. | |
1535 | * Remove the leaf and rebalance the tree | |
19baf839 RO |
1536 | */ |
1537 | ||
19baf839 RO |
1538 | t->size--; |
1539 | ||
06801916 | 1540 | tp = node_parent(n); |
19baf839 RO |
1541 | tnode_free((struct tnode *) n); |
1542 | ||
c877efb2 | 1543 | if (tp) { |
19baf839 RO |
1544 | cindex = tkey_extract_bits(key, tp->pos, tp->bits); |
1545 | put_child(t, (struct tnode *)tp, cindex, NULL); | |
2373ce1c | 1546 | rcu_assign_pointer(t->trie, trie_rebalance(t, tp)); |
91b9a277 | 1547 | } else |
2373ce1c | 1548 | rcu_assign_pointer(t->trie, NULL); |
19baf839 RO |
1549 | |
1550 | return 1; | |
1551 | } | |
1552 | ||
d562f1f8 RO |
1553 | /* |
1554 | * Caller must hold RTNL. | |
1555 | */ | |
4e902c57 | 1556 | static int fn_trie_delete(struct fib_table *tb, struct fib_config *cfg) |
19baf839 RO |
1557 | { |
1558 | struct trie *t = (struct trie *) tb->tb_data; | |
1559 | u32 key, mask; | |
4e902c57 TG |
1560 | int plen = cfg->fc_dst_len; |
1561 | u8 tos = cfg->fc_tos; | |
19baf839 RO |
1562 | struct fib_alias *fa, *fa_to_delete; |
1563 | struct list_head *fa_head; | |
1564 | struct leaf *l; | |
91b9a277 OJ |
1565 | struct leaf_info *li; |
1566 | ||
c877efb2 | 1567 | if (plen > 32) |
19baf839 RO |
1568 | return -EINVAL; |
1569 | ||
4e902c57 | 1570 | key = ntohl(cfg->fc_dst); |
91b9a277 | 1571 | mask = ntohl(inet_make_mask(plen)); |
19baf839 | 1572 | |
c877efb2 | 1573 | if (key & ~mask) |
19baf839 RO |
1574 | return -EINVAL; |
1575 | ||
1576 | key = key & mask; | |
1577 | l = fib_find_node(t, key); | |
1578 | ||
c877efb2 | 1579 | if (!l) |
19baf839 RO |
1580 | return -ESRCH; |
1581 | ||
1582 | fa_head = get_fa_head(l, plen); | |
1583 | fa = fib_find_alias(fa_head, tos, 0); | |
1584 | ||
1585 | if (!fa) | |
1586 | return -ESRCH; | |
1587 | ||
0c7770c7 | 1588 | pr_debug("Deleting %08x/%d tos=%d t=%p\n", key, plen, tos, t); |
19baf839 RO |
1589 | |
1590 | fa_to_delete = NULL; | |
1591 | fa_head = fa->fa_list.prev; | |
2373ce1c | 1592 | |
19baf839 RO |
1593 | list_for_each_entry(fa, fa_head, fa_list) { |
1594 | struct fib_info *fi = fa->fa_info; | |
1595 | ||
1596 | if (fa->fa_tos != tos) | |
1597 | break; | |
1598 | ||
4e902c57 TG |
1599 | if ((!cfg->fc_type || fa->fa_type == cfg->fc_type) && |
1600 | (cfg->fc_scope == RT_SCOPE_NOWHERE || | |
1601 | fa->fa_scope == cfg->fc_scope) && | |
1602 | (!cfg->fc_protocol || | |
1603 | fi->fib_protocol == cfg->fc_protocol) && | |
1604 | fib_nh_match(cfg, fi) == 0) { | |
19baf839 RO |
1605 | fa_to_delete = fa; |
1606 | break; | |
1607 | } | |
1608 | } | |
1609 | ||
91b9a277 OJ |
1610 | if (!fa_to_delete) |
1611 | return -ESRCH; | |
19baf839 | 1612 | |
91b9a277 | 1613 | fa = fa_to_delete; |
4e902c57 | 1614 | rtmsg_fib(RTM_DELROUTE, htonl(key), fa, plen, tb->tb_id, |
b8f55831 | 1615 | &cfg->fc_nlinfo, 0); |
91b9a277 OJ |
1616 | |
1617 | l = fib_find_node(t, key); | |
772cb712 | 1618 | li = find_leaf_info(l, plen); |
19baf839 | 1619 | |
2373ce1c | 1620 | list_del_rcu(&fa->fa_list); |
19baf839 | 1621 | |
91b9a277 | 1622 | if (list_empty(fa_head)) { |
2373ce1c | 1623 | hlist_del_rcu(&li->hlist); |
91b9a277 | 1624 | free_leaf_info(li); |
2373ce1c | 1625 | } |
19baf839 | 1626 | |
91b9a277 OJ |
1627 | if (hlist_empty(&l->list)) |
1628 | trie_leaf_remove(t, key); | |
19baf839 | 1629 | |
91b9a277 OJ |
1630 | if (fa->fa_state & FA_S_ACCESSED) |
1631 | rt_cache_flush(-1); | |
19baf839 | 1632 | |
2373ce1c RO |
1633 | fib_release_info(fa->fa_info); |
1634 | alias_free_mem_rcu(fa); | |
91b9a277 | 1635 | return 0; |
19baf839 RO |
1636 | } |
1637 | ||
1638 | static int trie_flush_list(struct trie *t, struct list_head *head) | |
1639 | { | |
1640 | struct fib_alias *fa, *fa_node; | |
1641 | int found = 0; | |
1642 | ||
1643 | list_for_each_entry_safe(fa, fa_node, head, fa_list) { | |
1644 | struct fib_info *fi = fa->fa_info; | |
19baf839 | 1645 | |
2373ce1c RO |
1646 | if (fi && (fi->fib_flags & RTNH_F_DEAD)) { |
1647 | list_del_rcu(&fa->fa_list); | |
1648 | fib_release_info(fa->fa_info); | |
1649 | alias_free_mem_rcu(fa); | |
19baf839 RO |
1650 | found++; |
1651 | } | |
1652 | } | |
1653 | return found; | |
1654 | } | |
1655 | ||
1656 | static int trie_flush_leaf(struct trie *t, struct leaf *l) | |
1657 | { | |
1658 | int found = 0; | |
1659 | struct hlist_head *lih = &l->list; | |
1660 | struct hlist_node *node, *tmp; | |
1661 | struct leaf_info *li = NULL; | |
1662 | ||
1663 | hlist_for_each_entry_safe(li, node, tmp, lih, hlist) { | |
19baf839 RO |
1664 | found += trie_flush_list(t, &li->falh); |
1665 | ||
1666 | if (list_empty(&li->falh)) { | |
2373ce1c | 1667 | hlist_del_rcu(&li->hlist); |
19baf839 RO |
1668 | free_leaf_info(li); |
1669 | } | |
1670 | } | |
1671 | return found; | |
1672 | } | |
1673 | ||
2373ce1c RO |
1674 | /* rcu_read_lock needs to be hold by caller from readside */ |
1675 | ||
19baf839 RO |
1676 | static struct leaf *nextleaf(struct trie *t, struct leaf *thisleaf) |
1677 | { | |
1678 | struct node *c = (struct node *) thisleaf; | |
1679 | struct tnode *p; | |
1680 | int idx; | |
2373ce1c | 1681 | struct node *trie = rcu_dereference(t->trie); |
19baf839 | 1682 | |
c877efb2 | 1683 | if (c == NULL) { |
2373ce1c | 1684 | if (trie == NULL) |
19baf839 RO |
1685 | return NULL; |
1686 | ||
2373ce1c RO |
1687 | if (IS_LEAF(trie)) /* trie w. just a leaf */ |
1688 | return (struct leaf *) trie; | |
19baf839 | 1689 | |
2373ce1c | 1690 | p = (struct tnode*) trie; /* Start */ |
91b9a277 | 1691 | } else |
06801916 | 1692 | p = node_parent(c); |
c877efb2 | 1693 | |
19baf839 RO |
1694 | while (p) { |
1695 | int pos, last; | |
1696 | ||
1697 | /* Find the next child of the parent */ | |
c877efb2 SH |
1698 | if (c) |
1699 | pos = 1 + tkey_extract_bits(c->key, p->pos, p->bits); | |
1700 | else | |
19baf839 RO |
1701 | pos = 0; |
1702 | ||
1703 | last = 1 << p->bits; | |
91b9a277 | 1704 | for (idx = pos; idx < last ; idx++) { |
2373ce1c RO |
1705 | c = rcu_dereference(p->child[idx]); |
1706 | ||
1707 | if (!c) | |
91b9a277 OJ |
1708 | continue; |
1709 | ||
1710 | /* Decend if tnode */ | |
2373ce1c RO |
1711 | while (IS_TNODE(c)) { |
1712 | p = (struct tnode *) c; | |
e905a9ed | 1713 | idx = 0; |
91b9a277 OJ |
1714 | |
1715 | /* Rightmost non-NULL branch */ | |
1716 | if (p && IS_TNODE(p)) | |
2373ce1c RO |
1717 | while (!(c = rcu_dereference(p->child[idx])) |
1718 | && idx < (1<<p->bits)) idx++; | |
91b9a277 OJ |
1719 | |
1720 | /* Done with this tnode? */ | |
2373ce1c | 1721 | if (idx >= (1 << p->bits) || !c) |
91b9a277 | 1722 | goto up; |
19baf839 | 1723 | } |
2373ce1c | 1724 | return (struct leaf *) c; |
19baf839 RO |
1725 | } |
1726 | up: | |
1727 | /* No more children go up one step */ | |
91b9a277 | 1728 | c = (struct node *) p; |
06801916 | 1729 | p = node_parent(c); |
19baf839 RO |
1730 | } |
1731 | return NULL; /* Ready. Root of trie */ | |
1732 | } | |
1733 | ||
d562f1f8 RO |
1734 | /* |
1735 | * Caller must hold RTNL. | |
1736 | */ | |
19baf839 RO |
1737 | static int fn_trie_flush(struct fib_table *tb) |
1738 | { | |
1739 | struct trie *t = (struct trie *) tb->tb_data; | |
1740 | struct leaf *ll = NULL, *l = NULL; | |
1741 | int found = 0, h; | |
1742 | ||
91b9a277 | 1743 | for (h = 0; (l = nextleaf(t, l)) != NULL; h++) { |
19baf839 RO |
1744 | found += trie_flush_leaf(t, l); |
1745 | ||
1746 | if (ll && hlist_empty(&ll->list)) | |
1747 | trie_leaf_remove(t, ll->key); | |
1748 | ll = l; | |
1749 | } | |
1750 | ||
1751 | if (ll && hlist_empty(&ll->list)) | |
1752 | trie_leaf_remove(t, ll->key); | |
1753 | ||
0c7770c7 | 1754 | pr_debug("trie_flush found=%d\n", found); |
19baf839 RO |
1755 | return found; |
1756 | } | |
1757 | ||
19baf839 RO |
1758 | static void |
1759 | fn_trie_select_default(struct fib_table *tb, const struct flowi *flp, struct fib_result *res) | |
1760 | { | |
1761 | struct trie *t = (struct trie *) tb->tb_data; | |
1762 | int order, last_idx; | |
1763 | struct fib_info *fi = NULL; | |
1764 | struct fib_info *last_resort; | |
1765 | struct fib_alias *fa = NULL; | |
1766 | struct list_head *fa_head; | |
1767 | struct leaf *l; | |
1768 | ||
1769 | last_idx = -1; | |
1770 | last_resort = NULL; | |
1771 | order = -1; | |
1772 | ||
2373ce1c | 1773 | rcu_read_lock(); |
c877efb2 | 1774 | |
19baf839 | 1775 | l = fib_find_node(t, 0); |
c877efb2 | 1776 | if (!l) |
19baf839 RO |
1777 | goto out; |
1778 | ||
1779 | fa_head = get_fa_head(l, 0); | |
c877efb2 | 1780 | if (!fa_head) |
19baf839 RO |
1781 | goto out; |
1782 | ||
c877efb2 | 1783 | if (list_empty(fa_head)) |
19baf839 RO |
1784 | goto out; |
1785 | ||
2373ce1c | 1786 | list_for_each_entry_rcu(fa, fa_head, fa_list) { |
19baf839 | 1787 | struct fib_info *next_fi = fa->fa_info; |
91b9a277 | 1788 | |
19baf839 RO |
1789 | if (fa->fa_scope != res->scope || |
1790 | fa->fa_type != RTN_UNICAST) | |
1791 | continue; | |
91b9a277 | 1792 | |
19baf839 RO |
1793 | if (next_fi->fib_priority > res->fi->fib_priority) |
1794 | break; | |
1795 | if (!next_fi->fib_nh[0].nh_gw || | |
1796 | next_fi->fib_nh[0].nh_scope != RT_SCOPE_LINK) | |
1797 | continue; | |
1798 | fa->fa_state |= FA_S_ACCESSED; | |
91b9a277 | 1799 | |
19baf839 RO |
1800 | if (fi == NULL) { |
1801 | if (next_fi != res->fi) | |
1802 | break; | |
1803 | } else if (!fib_detect_death(fi, order, &last_resort, | |
971b893e | 1804 | &last_idx, tb->tb_default)) { |
a2bbe682 | 1805 | fib_result_assign(res, fi); |
971b893e | 1806 | tb->tb_default = order; |
19baf839 RO |
1807 | goto out; |
1808 | } | |
1809 | fi = next_fi; | |
1810 | order++; | |
1811 | } | |
1812 | if (order <= 0 || fi == NULL) { | |
971b893e | 1813 | tb->tb_default = -1; |
19baf839 RO |
1814 | goto out; |
1815 | } | |
1816 | ||
971b893e DL |
1817 | if (!fib_detect_death(fi, order, &last_resort, &last_idx, |
1818 | tb->tb_default)) { | |
a2bbe682 | 1819 | fib_result_assign(res, fi); |
971b893e | 1820 | tb->tb_default = order; |
19baf839 RO |
1821 | goto out; |
1822 | } | |
a2bbe682 DL |
1823 | if (last_idx >= 0) |
1824 | fib_result_assign(res, last_resort); | |
971b893e DL |
1825 | tb->tb_default = last_idx; |
1826 | out: | |
2373ce1c | 1827 | rcu_read_unlock(); |
19baf839 RO |
1828 | } |
1829 | ||
c877efb2 | 1830 | static int fn_trie_dump_fa(t_key key, int plen, struct list_head *fah, struct fib_table *tb, |
19baf839 RO |
1831 | struct sk_buff *skb, struct netlink_callback *cb) |
1832 | { | |
1833 | int i, s_i; | |
1834 | struct fib_alias *fa; | |
1835 | ||
32ab5f80 | 1836 | __be32 xkey = htonl(key); |
19baf839 | 1837 | |
1af5a8c4 | 1838 | s_i = cb->args[4]; |
19baf839 RO |
1839 | i = 0; |
1840 | ||
2373ce1c RO |
1841 | /* rcu_read_lock is hold by caller */ |
1842 | ||
1843 | list_for_each_entry_rcu(fa, fah, fa_list) { | |
19baf839 RO |
1844 | if (i < s_i) { |
1845 | i++; | |
1846 | continue; | |
1847 | } | |
78c6671a | 1848 | BUG_ON(!fa->fa_info); |
19baf839 RO |
1849 | |
1850 | if (fib_dump_info(skb, NETLINK_CB(cb->skb).pid, | |
1851 | cb->nlh->nlmsg_seq, | |
1852 | RTM_NEWROUTE, | |
1853 | tb->tb_id, | |
1854 | fa->fa_type, | |
1855 | fa->fa_scope, | |
be403ea1 | 1856 | xkey, |
19baf839 RO |
1857 | plen, |
1858 | fa->fa_tos, | |
90f66914 | 1859 | fa->fa_info, 0) < 0) { |
1af5a8c4 | 1860 | cb->args[4] = i; |
19baf839 | 1861 | return -1; |
91b9a277 | 1862 | } |
19baf839 RO |
1863 | i++; |
1864 | } | |
1af5a8c4 | 1865 | cb->args[4] = i; |
19baf839 RO |
1866 | return skb->len; |
1867 | } | |
1868 | ||
c877efb2 | 1869 | static int fn_trie_dump_plen(struct trie *t, int plen, struct fib_table *tb, struct sk_buff *skb, |
19baf839 RO |
1870 | struct netlink_callback *cb) |
1871 | { | |
1872 | int h, s_h; | |
1873 | struct list_head *fa_head; | |
1874 | struct leaf *l = NULL; | |
19baf839 | 1875 | |
1af5a8c4 | 1876 | s_h = cb->args[3]; |
19baf839 | 1877 | |
91b9a277 | 1878 | for (h = 0; (l = nextleaf(t, l)) != NULL; h++) { |
19baf839 RO |
1879 | if (h < s_h) |
1880 | continue; | |
1881 | if (h > s_h) | |
1af5a8c4 PM |
1882 | memset(&cb->args[4], 0, |
1883 | sizeof(cb->args) - 4*sizeof(cb->args[0])); | |
19baf839 RO |
1884 | |
1885 | fa_head = get_fa_head(l, plen); | |
91b9a277 | 1886 | |
c877efb2 | 1887 | if (!fa_head) |
19baf839 RO |
1888 | continue; |
1889 | ||
c877efb2 | 1890 | if (list_empty(fa_head)) |
19baf839 RO |
1891 | continue; |
1892 | ||
1893 | if (fn_trie_dump_fa(l->key, plen, fa_head, tb, skb, cb)<0) { | |
1af5a8c4 | 1894 | cb->args[3] = h; |
19baf839 RO |
1895 | return -1; |
1896 | } | |
1897 | } | |
1af5a8c4 | 1898 | cb->args[3] = h; |
19baf839 RO |
1899 | return skb->len; |
1900 | } | |
1901 | ||
1902 | static int fn_trie_dump(struct fib_table *tb, struct sk_buff *skb, struct netlink_callback *cb) | |
1903 | { | |
1904 | int m, s_m; | |
1905 | struct trie *t = (struct trie *) tb->tb_data; | |
1906 | ||
1af5a8c4 | 1907 | s_m = cb->args[2]; |
19baf839 | 1908 | |
2373ce1c | 1909 | rcu_read_lock(); |
91b9a277 | 1910 | for (m = 0; m <= 32; m++) { |
19baf839 RO |
1911 | if (m < s_m) |
1912 | continue; | |
1913 | if (m > s_m) | |
1af5a8c4 PM |
1914 | memset(&cb->args[3], 0, |
1915 | sizeof(cb->args) - 3*sizeof(cb->args[0])); | |
19baf839 RO |
1916 | |
1917 | if (fn_trie_dump_plen(t, 32-m, tb, skb, cb)<0) { | |
1af5a8c4 | 1918 | cb->args[2] = m; |
19baf839 RO |
1919 | goto out; |
1920 | } | |
1921 | } | |
2373ce1c | 1922 | rcu_read_unlock(); |
1af5a8c4 | 1923 | cb->args[2] = m; |
19baf839 | 1924 | return skb->len; |
91b9a277 | 1925 | out: |
2373ce1c | 1926 | rcu_read_unlock(); |
19baf839 RO |
1927 | return -1; |
1928 | } | |
1929 | ||
1930 | /* Fix more generic FIB names for init later */ | |
1931 | ||
7b1a74fd | 1932 | struct fib_table *fib_hash_init(u32 id) |
19baf839 RO |
1933 | { |
1934 | struct fib_table *tb; | |
1935 | struct trie *t; | |
1936 | ||
1937 | if (fn_alias_kmem == NULL) | |
1938 | fn_alias_kmem = kmem_cache_create("ip_fib_alias", | |
1939 | sizeof(struct fib_alias), | |
1940 | 0, SLAB_HWCACHE_ALIGN, | |
20c2df83 | 1941 | NULL); |
19baf839 RO |
1942 | |
1943 | tb = kmalloc(sizeof(struct fib_table) + sizeof(struct trie), | |
1944 | GFP_KERNEL); | |
1945 | if (tb == NULL) | |
1946 | return NULL; | |
1947 | ||
1948 | tb->tb_id = id; | |
971b893e | 1949 | tb->tb_default = -1; |
19baf839 RO |
1950 | tb->tb_lookup = fn_trie_lookup; |
1951 | tb->tb_insert = fn_trie_insert; | |
1952 | tb->tb_delete = fn_trie_delete; | |
1953 | tb->tb_flush = fn_trie_flush; | |
1954 | tb->tb_select_default = fn_trie_select_default; | |
1955 | tb->tb_dump = fn_trie_dump; | |
19baf839 RO |
1956 | |
1957 | t = (struct trie *) tb->tb_data; | |
c28a1cf4 | 1958 | memset(t, 0, sizeof(*t)); |
19baf839 | 1959 | |
19baf839 | 1960 | if (id == RT_TABLE_LOCAL) |
78c6671a | 1961 | printk(KERN_INFO "IPv4 FIB: Using LC-trie version %s\n", VERSION); |
19baf839 RO |
1962 | |
1963 | return tb; | |
1964 | } | |
1965 | ||
cb7b593c SH |
1966 | #ifdef CONFIG_PROC_FS |
1967 | /* Depth first Trie walk iterator */ | |
1968 | struct fib_trie_iter { | |
1c340b2f | 1969 | struct seq_net_private p; |
877a9bff | 1970 | struct trie *trie_local, *trie_main; |
cb7b593c SH |
1971 | struct tnode *tnode; |
1972 | struct trie *trie; | |
1973 | unsigned index; | |
1974 | unsigned depth; | |
1975 | }; | |
19baf839 | 1976 | |
cb7b593c | 1977 | static struct node *fib_trie_get_next(struct fib_trie_iter *iter) |
19baf839 | 1978 | { |
cb7b593c SH |
1979 | struct tnode *tn = iter->tnode; |
1980 | unsigned cindex = iter->index; | |
1981 | struct tnode *p; | |
19baf839 | 1982 | |
6640e697 EB |
1983 | /* A single entry routing table */ |
1984 | if (!tn) | |
1985 | return NULL; | |
1986 | ||
cb7b593c SH |
1987 | pr_debug("get_next iter={node=%p index=%d depth=%d}\n", |
1988 | iter->tnode, iter->index, iter->depth); | |
1989 | rescan: | |
1990 | while (cindex < (1<<tn->bits)) { | |
1991 | struct node *n = tnode_get_child(tn, cindex); | |
19baf839 | 1992 | |
cb7b593c SH |
1993 | if (n) { |
1994 | if (IS_LEAF(n)) { | |
1995 | iter->tnode = tn; | |
1996 | iter->index = cindex + 1; | |
1997 | } else { | |
1998 | /* push down one level */ | |
1999 | iter->tnode = (struct tnode *) n; | |
2000 | iter->index = 0; | |
2001 | ++iter->depth; | |
2002 | } | |
2003 | return n; | |
2004 | } | |
19baf839 | 2005 | |
cb7b593c SH |
2006 | ++cindex; |
2007 | } | |
91b9a277 | 2008 | |
cb7b593c | 2009 | /* Current node exhausted, pop back up */ |
06801916 | 2010 | p = node_parent((struct node *)tn); |
cb7b593c SH |
2011 | if (p) { |
2012 | cindex = tkey_extract_bits(tn->key, p->pos, p->bits)+1; | |
2013 | tn = p; | |
2014 | --iter->depth; | |
2015 | goto rescan; | |
19baf839 | 2016 | } |
cb7b593c SH |
2017 | |
2018 | /* got root? */ | |
2019 | return NULL; | |
19baf839 RO |
2020 | } |
2021 | ||
cb7b593c SH |
2022 | static struct node *fib_trie_get_first(struct fib_trie_iter *iter, |
2023 | struct trie *t) | |
19baf839 | 2024 | { |
5ddf0eb2 RO |
2025 | struct node *n ; |
2026 | ||
132adf54 | 2027 | if (!t) |
5ddf0eb2 RO |
2028 | return NULL; |
2029 | ||
2030 | n = rcu_dereference(t->trie); | |
2031 | ||
132adf54 | 2032 | if (!iter) |
5ddf0eb2 | 2033 | return NULL; |
19baf839 | 2034 | |
6640e697 EB |
2035 | if (n) { |
2036 | if (IS_TNODE(n)) { | |
2037 | iter->tnode = (struct tnode *) n; | |
2038 | iter->trie = t; | |
2039 | iter->index = 0; | |
2040 | iter->depth = 1; | |
2041 | } else { | |
2042 | iter->tnode = NULL; | |
2043 | iter->trie = t; | |
2044 | iter->index = 0; | |
2045 | iter->depth = 0; | |
2046 | } | |
cb7b593c | 2047 | return n; |
91b9a277 | 2048 | } |
cb7b593c SH |
2049 | return NULL; |
2050 | } | |
91b9a277 | 2051 | |
cb7b593c SH |
2052 | static void trie_collect_stats(struct trie *t, struct trie_stat *s) |
2053 | { | |
2054 | struct node *n; | |
2055 | struct fib_trie_iter iter; | |
91b9a277 | 2056 | |
cb7b593c | 2057 | memset(s, 0, sizeof(*s)); |
91b9a277 | 2058 | |
cb7b593c SH |
2059 | rcu_read_lock(); |
2060 | for (n = fib_trie_get_first(&iter, t); n; | |
2061 | n = fib_trie_get_next(&iter)) { | |
2062 | if (IS_LEAF(n)) { | |
2063 | s->leaves++; | |
2064 | s->totdepth += iter.depth; | |
2065 | if (iter.depth > s->maxdepth) | |
2066 | s->maxdepth = iter.depth; | |
2067 | } else { | |
2068 | const struct tnode *tn = (const struct tnode *) n; | |
2069 | int i; | |
2070 | ||
2071 | s->tnodes++; | |
132adf54 | 2072 | if (tn->bits < MAX_STAT_DEPTH) |
06ef921d RO |
2073 | s->nodesizes[tn->bits]++; |
2074 | ||
cb7b593c SH |
2075 | for (i = 0; i < (1<<tn->bits); i++) |
2076 | if (!tn->child[i]) | |
2077 | s->nullpointers++; | |
19baf839 | 2078 | } |
19baf839 | 2079 | } |
2373ce1c | 2080 | rcu_read_unlock(); |
19baf839 RO |
2081 | } |
2082 | ||
cb7b593c SH |
2083 | /* |
2084 | * This outputs /proc/net/fib_triestats | |
2085 | */ | |
2086 | static void trie_show_stats(struct seq_file *seq, struct trie_stat *stat) | |
19baf839 | 2087 | { |
cb7b593c | 2088 | unsigned i, max, pointers, bytes, avdepth; |
c877efb2 | 2089 | |
cb7b593c SH |
2090 | if (stat->leaves) |
2091 | avdepth = stat->totdepth*100 / stat->leaves; | |
2092 | else | |
2093 | avdepth = 0; | |
91b9a277 | 2094 | |
187b5188 | 2095 | seq_printf(seq, "\tAver depth: %u.%02d\n", avdepth / 100, avdepth % 100 ); |
cb7b593c | 2096 | seq_printf(seq, "\tMax depth: %u\n", stat->maxdepth); |
91b9a277 | 2097 | |
cb7b593c | 2098 | seq_printf(seq, "\tLeaves: %u\n", stat->leaves); |
91b9a277 | 2099 | |
cb7b593c | 2100 | bytes = sizeof(struct leaf) * stat->leaves; |
187b5188 | 2101 | seq_printf(seq, "\tInternal nodes: %u\n\t", stat->tnodes); |
cb7b593c | 2102 | bytes += sizeof(struct tnode) * stat->tnodes; |
19baf839 | 2103 | |
06ef921d RO |
2104 | max = MAX_STAT_DEPTH; |
2105 | while (max > 0 && stat->nodesizes[max-1] == 0) | |
cb7b593c | 2106 | max--; |
19baf839 | 2107 | |
cb7b593c SH |
2108 | pointers = 0; |
2109 | for (i = 1; i <= max; i++) | |
2110 | if (stat->nodesizes[i] != 0) { | |
187b5188 | 2111 | seq_printf(seq, " %u: %u", i, stat->nodesizes[i]); |
cb7b593c SH |
2112 | pointers += (1<<i) * stat->nodesizes[i]; |
2113 | } | |
2114 | seq_putc(seq, '\n'); | |
187b5188 | 2115 | seq_printf(seq, "\tPointers: %u\n", pointers); |
2373ce1c | 2116 | |
cb7b593c | 2117 | bytes += sizeof(struct node *) * pointers; |
187b5188 SH |
2118 | seq_printf(seq, "Null ptrs: %u\n", stat->nullpointers); |
2119 | seq_printf(seq, "Total size: %u kB\n", (bytes + 1023) / 1024); | |
66a2f7fd | 2120 | } |
2373ce1c | 2121 | |
cb7b593c | 2122 | #ifdef CONFIG_IP_FIB_TRIE_STATS |
66a2f7fd SH |
2123 | static void trie_show_usage(struct seq_file *seq, |
2124 | const struct trie_use_stats *stats) | |
2125 | { | |
2126 | seq_printf(seq, "\nCounters:\n---------\n"); | |
2127 | seq_printf(seq,"gets = %u\n", stats->gets); | |
2128 | seq_printf(seq,"backtracks = %u\n", stats->backtrack); | |
2129 | seq_printf(seq,"semantic match passed = %u\n", stats->semantic_match_passed); | |
2130 | seq_printf(seq,"semantic match miss = %u\n", stats->semantic_match_miss); | |
2131 | seq_printf(seq,"null node hit= %u\n", stats->null_node_hit); | |
2132 | seq_printf(seq,"skipped node resize = %u\n\n", stats->resize_node_skipped); | |
cb7b593c | 2133 | } |
66a2f7fd SH |
2134 | #endif /* CONFIG_IP_FIB_TRIE_STATS */ |
2135 | ||
19baf839 | 2136 | |
cb7b593c SH |
2137 | static int fib_triestat_seq_show(struct seq_file *seq, void *v) |
2138 | { | |
1c340b2f | 2139 | struct net *net = (struct net *)seq->private; |
877a9bff | 2140 | struct trie *trie_local, *trie_main; |
cb7b593c | 2141 | struct trie_stat *stat; |
877a9bff EB |
2142 | struct fib_table *tb; |
2143 | ||
2144 | trie_local = NULL; | |
1c340b2f | 2145 | tb = fib_get_table(net, RT_TABLE_LOCAL); |
877a9bff EB |
2146 | if (tb) |
2147 | trie_local = (struct trie *) tb->tb_data; | |
2148 | ||
2149 | trie_main = NULL; | |
1c340b2f | 2150 | tb = fib_get_table(net, RT_TABLE_MAIN); |
877a9bff EB |
2151 | if (tb) |
2152 | trie_main = (struct trie *) tb->tb_data; | |
2153 | ||
91b9a277 | 2154 | |
cb7b593c SH |
2155 | stat = kmalloc(sizeof(*stat), GFP_KERNEL); |
2156 | if (!stat) | |
2157 | return -ENOMEM; | |
91b9a277 | 2158 | |
cb7b593c SH |
2159 | seq_printf(seq, "Basic info: size of leaf: %Zd bytes, size of tnode: %Zd bytes.\n", |
2160 | sizeof(struct leaf), sizeof(struct tnode)); | |
91b9a277 | 2161 | |
cb7b593c SH |
2162 | if (trie_local) { |
2163 | seq_printf(seq, "Local:\n"); | |
2164 | trie_collect_stats(trie_local, stat); | |
2165 | trie_show_stats(seq, stat); | |
66a2f7fd SH |
2166 | #ifdef CONFIG_IP_FIB_TRIE_STATS |
2167 | trie_show_usage(seq, &trie_local->stats); | |
2168 | #endif | |
cb7b593c | 2169 | } |
91b9a277 | 2170 | |
cb7b593c SH |
2171 | if (trie_main) { |
2172 | seq_printf(seq, "Main:\n"); | |
2173 | trie_collect_stats(trie_main, stat); | |
2174 | trie_show_stats(seq, stat); | |
66a2f7fd SH |
2175 | #ifdef CONFIG_IP_FIB_TRIE_STATS |
2176 | trie_show_usage(seq, &trie_main->stats); | |
2177 | #endif | |
19baf839 | 2178 | } |
cb7b593c | 2179 | kfree(stat); |
19baf839 | 2180 | |
cb7b593c | 2181 | return 0; |
19baf839 RO |
2182 | } |
2183 | ||
cb7b593c | 2184 | static int fib_triestat_seq_open(struct inode *inode, struct file *file) |
19baf839 | 2185 | { |
1c340b2f DL |
2186 | int err; |
2187 | struct net *net; | |
2188 | ||
2189 | net = get_proc_net(inode); | |
2190 | if (net == NULL) | |
2191 | return -ENXIO; | |
2192 | err = single_open(file, fib_triestat_seq_show, net); | |
2193 | if (err < 0) { | |
2194 | put_net(net); | |
2195 | return err; | |
2196 | } | |
2197 | return 0; | |
2198 | } | |
2199 | ||
2200 | static int fib_triestat_seq_release(struct inode *ino, struct file *f) | |
2201 | { | |
2202 | struct seq_file *seq = f->private_data; | |
2203 | put_net(seq->private); | |
2204 | return single_release(ino, f); | |
19baf839 RO |
2205 | } |
2206 | ||
9a32144e | 2207 | static const struct file_operations fib_triestat_fops = { |
cb7b593c SH |
2208 | .owner = THIS_MODULE, |
2209 | .open = fib_triestat_seq_open, | |
2210 | .read = seq_read, | |
2211 | .llseek = seq_lseek, | |
1c340b2f | 2212 | .release = fib_triestat_seq_release, |
cb7b593c SH |
2213 | }; |
2214 | ||
2215 | static struct node *fib_trie_get_idx(struct fib_trie_iter *iter, | |
2216 | loff_t pos) | |
19baf839 | 2217 | { |
cb7b593c SH |
2218 | loff_t idx = 0; |
2219 | struct node *n; | |
2220 | ||
877a9bff | 2221 | for (n = fib_trie_get_first(iter, iter->trie_local); |
cb7b593c SH |
2222 | n; ++idx, n = fib_trie_get_next(iter)) { |
2223 | if (pos == idx) | |
2224 | return n; | |
2225 | } | |
2226 | ||
877a9bff | 2227 | for (n = fib_trie_get_first(iter, iter->trie_main); |
cb7b593c SH |
2228 | n; ++idx, n = fib_trie_get_next(iter)) { |
2229 | if (pos == idx) | |
2230 | return n; | |
2231 | } | |
19baf839 RO |
2232 | return NULL; |
2233 | } | |
2234 | ||
cb7b593c | 2235 | static void *fib_trie_seq_start(struct seq_file *seq, loff_t *pos) |
c95aaf9a | 2236 | __acquires(RCU) |
19baf839 | 2237 | { |
877a9bff EB |
2238 | struct fib_trie_iter *iter = seq->private; |
2239 | struct fib_table *tb; | |
2240 | ||
2241 | if (!iter->trie_local) { | |
1c340b2f | 2242 | tb = fib_get_table(iter->p.net, RT_TABLE_LOCAL); |
877a9bff EB |
2243 | if (tb) |
2244 | iter->trie_local = (struct trie *) tb->tb_data; | |
2245 | } | |
2246 | if (!iter->trie_main) { | |
1c340b2f | 2247 | tb = fib_get_table(iter->p.net, RT_TABLE_MAIN); |
877a9bff EB |
2248 | if (tb) |
2249 | iter->trie_main = (struct trie *) tb->tb_data; | |
2250 | } | |
cb7b593c SH |
2251 | rcu_read_lock(); |
2252 | if (*pos == 0) | |
91b9a277 | 2253 | return SEQ_START_TOKEN; |
877a9bff | 2254 | return fib_trie_get_idx(iter, *pos - 1); |
19baf839 RO |
2255 | } |
2256 | ||
cb7b593c | 2257 | static void *fib_trie_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
19baf839 | 2258 | { |
cb7b593c SH |
2259 | struct fib_trie_iter *iter = seq->private; |
2260 | void *l = v; | |
2261 | ||
19baf839 | 2262 | ++*pos; |
91b9a277 | 2263 | if (v == SEQ_START_TOKEN) |
cb7b593c | 2264 | return fib_trie_get_idx(iter, 0); |
19baf839 | 2265 | |
cb7b593c SH |
2266 | v = fib_trie_get_next(iter); |
2267 | BUG_ON(v == l); | |
2268 | if (v) | |
2269 | return v; | |
19baf839 | 2270 | |
cb7b593c | 2271 | /* continue scan in next trie */ |
877a9bff EB |
2272 | if (iter->trie == iter->trie_local) |
2273 | return fib_trie_get_first(iter, iter->trie_main); | |
19baf839 | 2274 | |
cb7b593c SH |
2275 | return NULL; |
2276 | } | |
19baf839 | 2277 | |
cb7b593c | 2278 | static void fib_trie_seq_stop(struct seq_file *seq, void *v) |
c95aaf9a | 2279 | __releases(RCU) |
19baf839 | 2280 | { |
cb7b593c SH |
2281 | rcu_read_unlock(); |
2282 | } | |
91b9a277 | 2283 | |
cb7b593c SH |
2284 | static void seq_indent(struct seq_file *seq, int n) |
2285 | { | |
2286 | while (n-- > 0) seq_puts(seq, " "); | |
2287 | } | |
19baf839 | 2288 | |
cb7b593c SH |
2289 | static inline const char *rtn_scope(enum rt_scope_t s) |
2290 | { | |
2291 | static char buf[32]; | |
19baf839 | 2292 | |
132adf54 | 2293 | switch (s) { |
cb7b593c SH |
2294 | case RT_SCOPE_UNIVERSE: return "universe"; |
2295 | case RT_SCOPE_SITE: return "site"; | |
2296 | case RT_SCOPE_LINK: return "link"; | |
2297 | case RT_SCOPE_HOST: return "host"; | |
2298 | case RT_SCOPE_NOWHERE: return "nowhere"; | |
2299 | default: | |
2300 | snprintf(buf, sizeof(buf), "scope=%d", s); | |
2301 | return buf; | |
2302 | } | |
2303 | } | |
19baf839 | 2304 | |
cb7b593c SH |
2305 | static const char *rtn_type_names[__RTN_MAX] = { |
2306 | [RTN_UNSPEC] = "UNSPEC", | |
2307 | [RTN_UNICAST] = "UNICAST", | |
2308 | [RTN_LOCAL] = "LOCAL", | |
2309 | [RTN_BROADCAST] = "BROADCAST", | |
2310 | [RTN_ANYCAST] = "ANYCAST", | |
2311 | [RTN_MULTICAST] = "MULTICAST", | |
2312 | [RTN_BLACKHOLE] = "BLACKHOLE", | |
2313 | [RTN_UNREACHABLE] = "UNREACHABLE", | |
2314 | [RTN_PROHIBIT] = "PROHIBIT", | |
2315 | [RTN_THROW] = "THROW", | |
2316 | [RTN_NAT] = "NAT", | |
2317 | [RTN_XRESOLVE] = "XRESOLVE", | |
2318 | }; | |
19baf839 | 2319 | |
cb7b593c SH |
2320 | static inline const char *rtn_type(unsigned t) |
2321 | { | |
2322 | static char buf[32]; | |
19baf839 | 2323 | |
cb7b593c SH |
2324 | if (t < __RTN_MAX && rtn_type_names[t]) |
2325 | return rtn_type_names[t]; | |
187b5188 | 2326 | snprintf(buf, sizeof(buf), "type %u", t); |
cb7b593c | 2327 | return buf; |
19baf839 RO |
2328 | } |
2329 | ||
cb7b593c SH |
2330 | /* Pretty print the trie */ |
2331 | static int fib_trie_seq_show(struct seq_file *seq, void *v) | |
19baf839 | 2332 | { |
cb7b593c SH |
2333 | const struct fib_trie_iter *iter = seq->private; |
2334 | struct node *n = v; | |
c877efb2 | 2335 | |
cb7b593c SH |
2336 | if (v == SEQ_START_TOKEN) |
2337 | return 0; | |
19baf839 | 2338 | |
06801916 | 2339 | if (!node_parent(n)) { |
877a9bff | 2340 | if (iter->trie == iter->trie_local) |
095b8501 RO |
2341 | seq_puts(seq, "<local>:\n"); |
2342 | else | |
2343 | seq_puts(seq, "<main>:\n"); | |
2344 | } | |
2345 | ||
cb7b593c SH |
2346 | if (IS_TNODE(n)) { |
2347 | struct tnode *tn = (struct tnode *) n; | |
ab66b4a7 | 2348 | __be32 prf = htonl(mask_pfx(tn->key, tn->pos)); |
91b9a277 | 2349 | |
1d25cd6c RO |
2350 | seq_indent(seq, iter->depth-1); |
2351 | seq_printf(seq, " +-- %d.%d.%d.%d/%d %d %d %d\n", | |
e905a9ed | 2352 | NIPQUAD(prf), tn->pos, tn->bits, tn->full_children, |
1d25cd6c | 2353 | tn->empty_children); |
e905a9ed | 2354 | |
cb7b593c SH |
2355 | } else { |
2356 | struct leaf *l = (struct leaf *) n; | |
2357 | int i; | |
32ab5f80 | 2358 | __be32 val = htonl(l->key); |
cb7b593c SH |
2359 | |
2360 | seq_indent(seq, iter->depth); | |
2361 | seq_printf(seq, " |-- %d.%d.%d.%d\n", NIPQUAD(val)); | |
2362 | for (i = 32; i >= 0; i--) { | |
772cb712 | 2363 | struct leaf_info *li = find_leaf_info(l, i); |
cb7b593c SH |
2364 | if (li) { |
2365 | struct fib_alias *fa; | |
2366 | list_for_each_entry_rcu(fa, &li->falh, fa_list) { | |
2367 | seq_indent(seq, iter->depth+1); | |
2368 | seq_printf(seq, " /%d %s %s", i, | |
2369 | rtn_scope(fa->fa_scope), | |
2370 | rtn_type(fa->fa_type)); | |
2371 | if (fa->fa_tos) | |
2372 | seq_printf(seq, "tos =%d\n", | |
2373 | fa->fa_tos); | |
2374 | seq_putc(seq, '\n'); | |
2375 | } | |
2376 | } | |
2377 | } | |
19baf839 | 2378 | } |
cb7b593c | 2379 | |
19baf839 RO |
2380 | return 0; |
2381 | } | |
2382 | ||
f690808e | 2383 | static const struct seq_operations fib_trie_seq_ops = { |
cb7b593c SH |
2384 | .start = fib_trie_seq_start, |
2385 | .next = fib_trie_seq_next, | |
2386 | .stop = fib_trie_seq_stop, | |
2387 | .show = fib_trie_seq_show, | |
19baf839 RO |
2388 | }; |
2389 | ||
cb7b593c | 2390 | static int fib_trie_seq_open(struct inode *inode, struct file *file) |
19baf839 | 2391 | { |
1c340b2f DL |
2392 | return seq_open_net(inode, file, &fib_trie_seq_ops, |
2393 | sizeof(struct fib_trie_iter)); | |
19baf839 RO |
2394 | } |
2395 | ||
9a32144e | 2396 | static const struct file_operations fib_trie_fops = { |
cb7b593c SH |
2397 | .owner = THIS_MODULE, |
2398 | .open = fib_trie_seq_open, | |
2399 | .read = seq_read, | |
2400 | .llseek = seq_lseek, | |
1c340b2f | 2401 | .release = seq_release_net, |
19baf839 RO |
2402 | }; |
2403 | ||
32ab5f80 | 2404 | static unsigned fib_flag_trans(int type, __be32 mask, const struct fib_info *fi) |
19baf839 | 2405 | { |
cb7b593c SH |
2406 | static unsigned type2flags[RTN_MAX + 1] = { |
2407 | [7] = RTF_REJECT, [8] = RTF_REJECT, | |
2408 | }; | |
2409 | unsigned flags = type2flags[type]; | |
19baf839 | 2410 | |
cb7b593c SH |
2411 | if (fi && fi->fib_nh->nh_gw) |
2412 | flags |= RTF_GATEWAY; | |
32ab5f80 | 2413 | if (mask == htonl(0xFFFFFFFF)) |
cb7b593c SH |
2414 | flags |= RTF_HOST; |
2415 | flags |= RTF_UP; | |
2416 | return flags; | |
19baf839 RO |
2417 | } |
2418 | ||
cb7b593c SH |
2419 | /* |
2420 | * This outputs /proc/net/route. | |
2421 | * The format of the file is not supposed to be changed | |
2422 | * and needs to be same as fib_hash output to avoid breaking | |
2423 | * legacy utilities | |
2424 | */ | |
2425 | static int fib_route_seq_show(struct seq_file *seq, void *v) | |
19baf839 | 2426 | { |
c9e53cbe | 2427 | const struct fib_trie_iter *iter = seq->private; |
cb7b593c SH |
2428 | struct leaf *l = v; |
2429 | int i; | |
2430 | char bf[128]; | |
19baf839 | 2431 | |
cb7b593c SH |
2432 | if (v == SEQ_START_TOKEN) { |
2433 | seq_printf(seq, "%-127s\n", "Iface\tDestination\tGateway " | |
2434 | "\tFlags\tRefCnt\tUse\tMetric\tMask\t\tMTU" | |
2435 | "\tWindow\tIRTT"); | |
2436 | return 0; | |
2437 | } | |
19baf839 | 2438 | |
877a9bff | 2439 | if (iter->trie == iter->trie_local) |
c9e53cbe | 2440 | return 0; |
cb7b593c SH |
2441 | if (IS_TNODE(l)) |
2442 | return 0; | |
19baf839 | 2443 | |
cb7b593c | 2444 | for (i=32; i>=0; i--) { |
772cb712 | 2445 | struct leaf_info *li = find_leaf_info(l, i); |
cb7b593c | 2446 | struct fib_alias *fa; |
32ab5f80 | 2447 | __be32 mask, prefix; |
91b9a277 | 2448 | |
cb7b593c SH |
2449 | if (!li) |
2450 | continue; | |
19baf839 | 2451 | |
cb7b593c SH |
2452 | mask = inet_make_mask(li->plen); |
2453 | prefix = htonl(l->key); | |
19baf839 | 2454 | |
cb7b593c | 2455 | list_for_each_entry_rcu(fa, &li->falh, fa_list) { |
1371e37d | 2456 | const struct fib_info *fi = fa->fa_info; |
cb7b593c | 2457 | unsigned flags = fib_flag_trans(fa->fa_type, mask, fi); |
19baf839 | 2458 | |
cb7b593c SH |
2459 | if (fa->fa_type == RTN_BROADCAST |
2460 | || fa->fa_type == RTN_MULTICAST) | |
2461 | continue; | |
19baf839 | 2462 | |
cb7b593c SH |
2463 | if (fi) |
2464 | snprintf(bf, sizeof(bf), | |
2465 | "%s\t%08X\t%08X\t%04X\t%d\t%u\t%d\t%08X\t%d\t%u\t%u", | |
2466 | fi->fib_dev ? fi->fib_dev->name : "*", | |
2467 | prefix, | |
2468 | fi->fib_nh->nh_gw, flags, 0, 0, | |
2469 | fi->fib_priority, | |
2470 | mask, | |
2471 | (fi->fib_advmss ? fi->fib_advmss + 40 : 0), | |
2472 | fi->fib_window, | |
2473 | fi->fib_rtt >> 3); | |
2474 | else | |
2475 | snprintf(bf, sizeof(bf), | |
2476 | "*\t%08X\t%08X\t%04X\t%d\t%u\t%d\t%08X\t%d\t%u\t%u", | |
2477 | prefix, 0, flags, 0, 0, 0, | |
2478 | mask, 0, 0, 0); | |
19baf839 | 2479 | |
cb7b593c SH |
2480 | seq_printf(seq, "%-127s\n", bf); |
2481 | } | |
19baf839 RO |
2482 | } |
2483 | ||
2484 | return 0; | |
2485 | } | |
2486 | ||
f690808e | 2487 | static const struct seq_operations fib_route_seq_ops = { |
cb7b593c SH |
2488 | .start = fib_trie_seq_start, |
2489 | .next = fib_trie_seq_next, | |
2490 | .stop = fib_trie_seq_stop, | |
2491 | .show = fib_route_seq_show, | |
19baf839 RO |
2492 | }; |
2493 | ||
cb7b593c | 2494 | static int fib_route_seq_open(struct inode *inode, struct file *file) |
19baf839 | 2495 | { |
1c340b2f DL |
2496 | return seq_open_net(inode, file, &fib_route_seq_ops, |
2497 | sizeof(struct fib_trie_iter)); | |
19baf839 RO |
2498 | } |
2499 | ||
9a32144e | 2500 | static const struct file_operations fib_route_fops = { |
cb7b593c SH |
2501 | .owner = THIS_MODULE, |
2502 | .open = fib_route_seq_open, | |
2503 | .read = seq_read, | |
2504 | .llseek = seq_lseek, | |
1c340b2f | 2505 | .release = seq_release_net, |
19baf839 RO |
2506 | }; |
2507 | ||
61a02653 | 2508 | int __net_init fib_proc_init(struct net *net) |
19baf839 | 2509 | { |
61a02653 | 2510 | if (!proc_net_fops_create(net, "fib_trie", S_IRUGO, &fib_trie_fops)) |
cb7b593c SH |
2511 | goto out1; |
2512 | ||
61a02653 DL |
2513 | if (!proc_net_fops_create(net, "fib_triestat", S_IRUGO, |
2514 | &fib_triestat_fops)) | |
cb7b593c SH |
2515 | goto out2; |
2516 | ||
61a02653 | 2517 | if (!proc_net_fops_create(net, "route", S_IRUGO, &fib_route_fops)) |
cb7b593c SH |
2518 | goto out3; |
2519 | ||
19baf839 | 2520 | return 0; |
cb7b593c SH |
2521 | |
2522 | out3: | |
61a02653 | 2523 | proc_net_remove(net, "fib_triestat"); |
cb7b593c | 2524 | out2: |
61a02653 | 2525 | proc_net_remove(net, "fib_trie"); |
cb7b593c SH |
2526 | out1: |
2527 | return -ENOMEM; | |
19baf839 RO |
2528 | } |
2529 | ||
61a02653 | 2530 | void __net_exit fib_proc_exit(struct net *net) |
19baf839 | 2531 | { |
61a02653 DL |
2532 | proc_net_remove(net, "fib_trie"); |
2533 | proc_net_remove(net, "fib_triestat"); | |
2534 | proc_net_remove(net, "route"); | |
19baf839 RO |
2535 | } |
2536 | ||
2537 | #endif /* CONFIG_PROC_FS */ |