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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 | 100 | unsigned long parent; |
8d965444 | 101 | t_key key; |
19baf839 RO |
102 | }; |
103 | ||
104 | struct leaf { | |
91b9a277 | 105 | unsigned long parent; |
8d965444 | 106 | t_key key; |
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 | 119 | unsigned long parent; |
8d965444 | 120 | t_key key; |
112d8cfc ED |
121 | unsigned char pos; /* 2log(KEYLENGTH) bits needed */ |
122 | unsigned char bits; /* 2log(KEYLENGTH) bits needed */ | |
8d965444 ED |
123 | unsigned int full_children; /* KEYLENGTH bits needed */ |
124 | unsigned int 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; | |
93672292 | 146 | unsigned int prefixes; |
06ef921d | 147 | unsigned int nodesizes[MAX_STAT_DEPTH]; |
c877efb2 | 148 | }; |
19baf839 RO |
149 | |
150 | struct trie { | |
91b9a277 | 151 | struct node *trie; |
19baf839 RO |
152 | #ifdef CONFIG_IP_FIB_TRIE_STATS |
153 | struct trie_use_stats stats; | |
154 | #endif | |
19baf839 RO |
155 | }; |
156 | ||
19baf839 | 157 | static void put_child(struct trie *t, struct tnode *tn, int i, struct node *n); |
a07f5f50 SH |
158 | static void tnode_put_child_reorg(struct tnode *tn, int i, struct node *n, |
159 | int wasfull); | |
19baf839 | 160 | static struct node *resize(struct trie *t, struct tnode *tn); |
2f80b3c8 RO |
161 | static struct tnode *inflate(struct trie *t, struct tnode *tn); |
162 | static struct tnode *halve(struct trie *t, struct tnode *tn); | |
19baf839 | 163 | static void tnode_free(struct tnode *tn); |
19baf839 | 164 | |
e18b890b | 165 | static struct kmem_cache *fn_alias_kmem __read_mostly; |
bc3c8c1e | 166 | static struct kmem_cache *trie_leaf_kmem __read_mostly; |
19baf839 | 167 | |
06801916 SH |
168 | static inline struct tnode *node_parent(struct node *node) |
169 | { | |
b59cfbf7 ED |
170 | return (struct tnode *)(node->parent & ~NODE_TYPE_MASK); |
171 | } | |
172 | ||
173 | static inline struct tnode *node_parent_rcu(struct node *node) | |
174 | { | |
175 | struct tnode *ret = node_parent(node); | |
06801916 | 176 | |
06801916 SH |
177 | return rcu_dereference(ret); |
178 | } | |
179 | ||
180 | static inline void node_set_parent(struct node *node, struct tnode *ptr) | |
181 | { | |
182 | rcu_assign_pointer(node->parent, | |
183 | (unsigned long)ptr | NODE_TYPE(node)); | |
184 | } | |
2373ce1c | 185 | |
b59cfbf7 ED |
186 | static inline struct node *tnode_get_child(struct tnode *tn, unsigned int i) |
187 | { | |
188 | BUG_ON(i >= 1U << tn->bits); | |
2373ce1c | 189 | |
b59cfbf7 ED |
190 | return tn->child[i]; |
191 | } | |
192 | ||
193 | static inline struct node *tnode_get_child_rcu(struct tnode *tn, unsigned int i) | |
19baf839 | 194 | { |
b59cfbf7 | 195 | struct node *ret = tnode_get_child(tn, i); |
19baf839 | 196 | |
b59cfbf7 | 197 | return rcu_dereference(ret); |
19baf839 RO |
198 | } |
199 | ||
bb435b8d | 200 | static inline int tnode_child_length(const struct tnode *tn) |
19baf839 | 201 | { |
91b9a277 | 202 | return 1 << tn->bits; |
19baf839 RO |
203 | } |
204 | ||
ab66b4a7 SH |
205 | static inline t_key mask_pfx(t_key k, unsigned short l) |
206 | { | |
207 | return (l == 0) ? 0 : k >> (KEYLENGTH-l) << (KEYLENGTH-l); | |
208 | } | |
209 | ||
19baf839 RO |
210 | static inline t_key tkey_extract_bits(t_key a, int offset, int bits) |
211 | { | |
91b9a277 | 212 | if (offset < KEYLENGTH) |
19baf839 | 213 | return ((t_key)(a << offset)) >> (KEYLENGTH - bits); |
91b9a277 | 214 | else |
19baf839 RO |
215 | return 0; |
216 | } | |
217 | ||
218 | static inline int tkey_equals(t_key a, t_key b) | |
219 | { | |
c877efb2 | 220 | return a == b; |
19baf839 RO |
221 | } |
222 | ||
223 | static inline int tkey_sub_equals(t_key a, int offset, int bits, t_key b) | |
224 | { | |
c877efb2 SH |
225 | if (bits == 0 || offset >= KEYLENGTH) |
226 | return 1; | |
91b9a277 OJ |
227 | bits = bits > KEYLENGTH ? KEYLENGTH : bits; |
228 | return ((a ^ b) << offset) >> (KEYLENGTH - bits) == 0; | |
c877efb2 | 229 | } |
19baf839 RO |
230 | |
231 | static inline int tkey_mismatch(t_key a, int offset, t_key b) | |
232 | { | |
233 | t_key diff = a ^ b; | |
234 | int i = offset; | |
235 | ||
c877efb2 SH |
236 | if (!diff) |
237 | return 0; | |
238 | while ((diff << i) >> (KEYLENGTH-1) == 0) | |
19baf839 RO |
239 | i++; |
240 | return i; | |
241 | } | |
242 | ||
19baf839 | 243 | /* |
e905a9ed YH |
244 | To understand this stuff, an understanding of keys and all their bits is |
245 | necessary. Every node in the trie has a key associated with it, but not | |
19baf839 RO |
246 | all of the bits in that key are significant. |
247 | ||
248 | Consider a node 'n' and its parent 'tp'. | |
249 | ||
e905a9ed YH |
250 | If n is a leaf, every bit in its key is significant. Its presence is |
251 | necessitated by path compression, since during a tree traversal (when | |
252 | searching for a leaf - unless we are doing an insertion) we will completely | |
253 | ignore all skipped bits we encounter. Thus we need to verify, at the end of | |
254 | a potentially successful search, that we have indeed been walking the | |
19baf839 RO |
255 | correct key path. |
256 | ||
e905a9ed YH |
257 | Note that we can never "miss" the correct key in the tree if present by |
258 | following the wrong path. Path compression ensures that segments of the key | |
259 | that are the same for all keys with a given prefix are skipped, but the | |
260 | skipped part *is* identical for each node in the subtrie below the skipped | |
261 | bit! trie_insert() in this implementation takes care of that - note the | |
19baf839 RO |
262 | call to tkey_sub_equals() in trie_insert(). |
263 | ||
e905a9ed | 264 | if n is an internal node - a 'tnode' here, the various parts of its key |
19baf839 RO |
265 | have many different meanings. |
266 | ||
e905a9ed | 267 | Example: |
19baf839 RO |
268 | _________________________________________________________________ |
269 | | i | i | i | i | i | i | i | N | N | N | S | S | S | S | S | C | | |
270 | ----------------------------------------------------------------- | |
e905a9ed | 271 | 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 |
19baf839 RO |
272 | |
273 | _________________________________________________________________ | |
274 | | C | C | C | u | u | u | u | u | u | u | u | u | u | u | u | u | | |
275 | ----------------------------------------------------------------- | |
276 | 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 | |
277 | ||
278 | tp->pos = 7 | |
279 | tp->bits = 3 | |
280 | n->pos = 15 | |
91b9a277 | 281 | n->bits = 4 |
19baf839 | 282 | |
e905a9ed YH |
283 | First, let's just ignore the bits that come before the parent tp, that is |
284 | the bits from 0 to (tp->pos-1). They are *known* but at this point we do | |
19baf839 RO |
285 | not use them for anything. |
286 | ||
287 | The bits from (tp->pos) to (tp->pos + tp->bits - 1) - "N", above - are the | |
e905a9ed | 288 | index into the parent's child array. That is, they will be used to find |
19baf839 RO |
289 | 'n' among tp's children. |
290 | ||
291 | The bits from (tp->pos + tp->bits) to (n->pos - 1) - "S" - are skipped bits | |
292 | for the node n. | |
293 | ||
e905a9ed | 294 | All the bits we have seen so far are significant to the node n. The rest |
19baf839 RO |
295 | of the bits are really not needed or indeed known in n->key. |
296 | ||
e905a9ed | 297 | The bits from (n->pos) to (n->pos + n->bits - 1) - "C" - are the index into |
19baf839 | 298 | n's child array, and will of course be different for each child. |
e905a9ed | 299 | |
c877efb2 | 300 | |
19baf839 RO |
301 | The rest of the bits, from (n->pos + n->bits) onward, are completely unknown |
302 | at this point. | |
303 | ||
304 | */ | |
305 | ||
0c7770c7 | 306 | static inline void check_tnode(const struct tnode *tn) |
19baf839 | 307 | { |
0c7770c7 | 308 | WARN_ON(tn && tn->pos+tn->bits > 32); |
19baf839 RO |
309 | } |
310 | ||
f5026fab DL |
311 | static const int halve_threshold = 25; |
312 | static const int inflate_threshold = 50; | |
313 | static const int halve_threshold_root = 8; | |
314 | static const int inflate_threshold_root = 15; | |
19baf839 | 315 | |
2373ce1c RO |
316 | |
317 | static void __alias_free_mem(struct rcu_head *head) | |
19baf839 | 318 | { |
2373ce1c RO |
319 | struct fib_alias *fa = container_of(head, struct fib_alias, rcu); |
320 | kmem_cache_free(fn_alias_kmem, fa); | |
19baf839 RO |
321 | } |
322 | ||
2373ce1c | 323 | static inline void alias_free_mem_rcu(struct fib_alias *fa) |
19baf839 | 324 | { |
2373ce1c RO |
325 | call_rcu(&fa->rcu, __alias_free_mem); |
326 | } | |
91b9a277 | 327 | |
2373ce1c RO |
328 | static void __leaf_free_rcu(struct rcu_head *head) |
329 | { | |
bc3c8c1e SH |
330 | struct leaf *l = container_of(head, struct leaf, rcu); |
331 | kmem_cache_free(trie_leaf_kmem, l); | |
2373ce1c | 332 | } |
91b9a277 | 333 | |
2373ce1c | 334 | static void __leaf_info_free_rcu(struct rcu_head *head) |
19baf839 | 335 | { |
2373ce1c | 336 | kfree(container_of(head, struct leaf_info, rcu)); |
19baf839 RO |
337 | } |
338 | ||
2373ce1c | 339 | static inline void free_leaf_info(struct leaf_info *leaf) |
19baf839 | 340 | { |
2373ce1c | 341 | call_rcu(&leaf->rcu, __leaf_info_free_rcu); |
19baf839 RO |
342 | } |
343 | ||
8d965444 | 344 | static struct tnode *tnode_alloc(size_t size) |
f0e36f8c | 345 | { |
2373ce1c RO |
346 | struct page *pages; |
347 | ||
348 | if (size <= PAGE_SIZE) | |
8d965444 | 349 | return kzalloc(size, GFP_KERNEL); |
2373ce1c RO |
350 | |
351 | pages = alloc_pages(GFP_KERNEL|__GFP_ZERO, get_order(size)); | |
352 | if (!pages) | |
353 | return NULL; | |
354 | ||
355 | return page_address(pages); | |
f0e36f8c PM |
356 | } |
357 | ||
2373ce1c | 358 | static void __tnode_free_rcu(struct rcu_head *head) |
f0e36f8c | 359 | { |
2373ce1c | 360 | struct tnode *tn = container_of(head, struct tnode, rcu); |
8d965444 ED |
361 | size_t size = sizeof(struct tnode) + |
362 | (sizeof(struct node *) << tn->bits); | |
f0e36f8c PM |
363 | |
364 | if (size <= PAGE_SIZE) | |
365 | kfree(tn); | |
366 | else | |
367 | free_pages((unsigned long)tn, get_order(size)); | |
368 | } | |
369 | ||
2373ce1c RO |
370 | static inline void tnode_free(struct tnode *tn) |
371 | { | |
132adf54 | 372 | if (IS_LEAF(tn)) { |
550e29bc RO |
373 | struct leaf *l = (struct leaf *) tn; |
374 | call_rcu_bh(&l->rcu, __leaf_free_rcu); | |
132adf54 | 375 | } else |
550e29bc | 376 | call_rcu(&tn->rcu, __tnode_free_rcu); |
2373ce1c RO |
377 | } |
378 | ||
379 | static struct leaf *leaf_new(void) | |
380 | { | |
bc3c8c1e | 381 | struct leaf *l = kmem_cache_alloc(trie_leaf_kmem, GFP_KERNEL); |
2373ce1c RO |
382 | if (l) { |
383 | l->parent = T_LEAF; | |
384 | INIT_HLIST_HEAD(&l->list); | |
385 | } | |
386 | return l; | |
387 | } | |
388 | ||
389 | static struct leaf_info *leaf_info_new(int plen) | |
390 | { | |
391 | struct leaf_info *li = kmalloc(sizeof(struct leaf_info), GFP_KERNEL); | |
392 | if (li) { | |
393 | li->plen = plen; | |
394 | INIT_LIST_HEAD(&li->falh); | |
395 | } | |
396 | return li; | |
397 | } | |
398 | ||
a07f5f50 | 399 | static struct tnode *tnode_new(t_key key, int pos, int bits) |
19baf839 | 400 | { |
8d965444 | 401 | size_t sz = sizeof(struct tnode) + (sizeof(struct node *) << bits); |
f0e36f8c | 402 | struct tnode *tn = tnode_alloc(sz); |
19baf839 | 403 | |
91b9a277 | 404 | if (tn) { |
2373ce1c | 405 | tn->parent = T_TNODE; |
19baf839 RO |
406 | tn->pos = pos; |
407 | tn->bits = bits; | |
408 | tn->key = key; | |
409 | tn->full_children = 0; | |
410 | tn->empty_children = 1<<bits; | |
411 | } | |
c877efb2 | 412 | |
8d965444 ED |
413 | pr_debug("AT %p s=%u %lu\n", tn, (unsigned int) sizeof(struct tnode), |
414 | (unsigned long) (sizeof(struct node) << bits)); | |
19baf839 RO |
415 | return tn; |
416 | } | |
417 | ||
19baf839 RO |
418 | /* |
419 | * Check whether a tnode 'n' is "full", i.e. it is an internal node | |
420 | * and no bits are skipped. See discussion in dyntree paper p. 6 | |
421 | */ | |
422 | ||
bb435b8d | 423 | static inline int tnode_full(const struct tnode *tn, const struct node *n) |
19baf839 | 424 | { |
c877efb2 | 425 | if (n == NULL || IS_LEAF(n)) |
19baf839 RO |
426 | return 0; |
427 | ||
428 | return ((struct tnode *) n)->pos == tn->pos + tn->bits; | |
429 | } | |
430 | ||
a07f5f50 SH |
431 | static inline void put_child(struct trie *t, struct tnode *tn, int i, |
432 | struct node *n) | |
19baf839 RO |
433 | { |
434 | tnode_put_child_reorg(tn, i, n, -1); | |
435 | } | |
436 | ||
c877efb2 | 437 | /* |
19baf839 RO |
438 | * Add a child at position i overwriting the old value. |
439 | * Update the value of full_children and empty_children. | |
440 | */ | |
441 | ||
a07f5f50 SH |
442 | static void tnode_put_child_reorg(struct tnode *tn, int i, struct node *n, |
443 | int wasfull) | |
19baf839 | 444 | { |
2373ce1c | 445 | struct node *chi = tn->child[i]; |
19baf839 RO |
446 | int isfull; |
447 | ||
0c7770c7 SH |
448 | BUG_ON(i >= 1<<tn->bits); |
449 | ||
19baf839 RO |
450 | /* update emptyChildren */ |
451 | if (n == NULL && chi != NULL) | |
452 | tn->empty_children++; | |
453 | else if (n != NULL && chi == NULL) | |
454 | tn->empty_children--; | |
c877efb2 | 455 | |
19baf839 | 456 | /* update fullChildren */ |
91b9a277 | 457 | if (wasfull == -1) |
19baf839 RO |
458 | wasfull = tnode_full(tn, chi); |
459 | ||
460 | isfull = tnode_full(tn, n); | |
c877efb2 | 461 | if (wasfull && !isfull) |
19baf839 | 462 | tn->full_children--; |
c877efb2 | 463 | else if (!wasfull && isfull) |
19baf839 | 464 | tn->full_children++; |
91b9a277 | 465 | |
c877efb2 | 466 | if (n) |
06801916 | 467 | node_set_parent(n, tn); |
19baf839 | 468 | |
2373ce1c | 469 | rcu_assign_pointer(tn->child[i], n); |
19baf839 RO |
470 | } |
471 | ||
c877efb2 | 472 | static struct node *resize(struct trie *t, struct tnode *tn) |
19baf839 RO |
473 | { |
474 | int i; | |
2f36895a | 475 | int err = 0; |
2f80b3c8 | 476 | struct tnode *old_tn; |
e6308be8 RO |
477 | int inflate_threshold_use; |
478 | int halve_threshold_use; | |
05eee48c | 479 | int max_resize; |
19baf839 | 480 | |
e905a9ed | 481 | if (!tn) |
19baf839 RO |
482 | return NULL; |
483 | ||
0c7770c7 SH |
484 | pr_debug("In tnode_resize %p inflate_threshold=%d threshold=%d\n", |
485 | tn, inflate_threshold, halve_threshold); | |
19baf839 RO |
486 | |
487 | /* No children */ | |
488 | if (tn->empty_children == tnode_child_length(tn)) { | |
489 | tnode_free(tn); | |
490 | return NULL; | |
491 | } | |
492 | /* One child */ | |
493 | if (tn->empty_children == tnode_child_length(tn) - 1) | |
494 | for (i = 0; i < tnode_child_length(tn); i++) { | |
91b9a277 | 495 | struct node *n; |
19baf839 | 496 | |
91b9a277 | 497 | n = tn->child[i]; |
2373ce1c | 498 | if (!n) |
91b9a277 | 499 | continue; |
91b9a277 OJ |
500 | |
501 | /* compress one level */ | |
06801916 | 502 | node_set_parent(n, NULL); |
91b9a277 OJ |
503 | tnode_free(tn); |
504 | return n; | |
19baf839 | 505 | } |
c877efb2 | 506 | /* |
19baf839 RO |
507 | * Double as long as the resulting node has a number of |
508 | * nonempty nodes that are above the threshold. | |
509 | */ | |
510 | ||
511 | /* | |
c877efb2 SH |
512 | * From "Implementing a dynamic compressed trie" by Stefan Nilsson of |
513 | * the Helsinki University of Technology and Matti Tikkanen of Nokia | |
19baf839 | 514 | * Telecommunications, page 6: |
c877efb2 | 515 | * "A node is doubled if the ratio of non-empty children to all |
19baf839 RO |
516 | * children in the *doubled* node is at least 'high'." |
517 | * | |
c877efb2 SH |
518 | * 'high' in this instance is the variable 'inflate_threshold'. It |
519 | * is expressed as a percentage, so we multiply it with | |
520 | * tnode_child_length() and instead of multiplying by 2 (since the | |
521 | * child array will be doubled by inflate()) and multiplying | |
522 | * the left-hand side by 100 (to handle the percentage thing) we | |
19baf839 | 523 | * multiply the left-hand side by 50. |
c877efb2 SH |
524 | * |
525 | * The left-hand side may look a bit weird: tnode_child_length(tn) | |
526 | * - tn->empty_children is of course the number of non-null children | |
527 | * in the current node. tn->full_children is the number of "full" | |
19baf839 | 528 | * children, that is non-null tnodes with a skip value of 0. |
c877efb2 | 529 | * All of those will be doubled in the resulting inflated tnode, so |
19baf839 | 530 | * we just count them one extra time here. |
c877efb2 | 531 | * |
19baf839 | 532 | * A clearer way to write this would be: |
c877efb2 | 533 | * |
19baf839 | 534 | * to_be_doubled = tn->full_children; |
c877efb2 | 535 | * not_to_be_doubled = tnode_child_length(tn) - tn->empty_children - |
19baf839 RO |
536 | * tn->full_children; |
537 | * | |
538 | * new_child_length = tnode_child_length(tn) * 2; | |
539 | * | |
c877efb2 | 540 | * new_fill_factor = 100 * (not_to_be_doubled + 2*to_be_doubled) / |
19baf839 RO |
541 | * new_child_length; |
542 | * if (new_fill_factor >= inflate_threshold) | |
c877efb2 SH |
543 | * |
544 | * ...and so on, tho it would mess up the while () loop. | |
545 | * | |
19baf839 RO |
546 | * anyway, |
547 | * 100 * (not_to_be_doubled + 2*to_be_doubled) / new_child_length >= | |
548 | * inflate_threshold | |
c877efb2 | 549 | * |
19baf839 RO |
550 | * avoid a division: |
551 | * 100 * (not_to_be_doubled + 2*to_be_doubled) >= | |
552 | * inflate_threshold * new_child_length | |
c877efb2 | 553 | * |
19baf839 | 554 | * expand not_to_be_doubled and to_be_doubled, and shorten: |
c877efb2 | 555 | * 100 * (tnode_child_length(tn) - tn->empty_children + |
91b9a277 | 556 | * tn->full_children) >= inflate_threshold * new_child_length |
c877efb2 | 557 | * |
19baf839 | 558 | * expand new_child_length: |
c877efb2 | 559 | * 100 * (tnode_child_length(tn) - tn->empty_children + |
91b9a277 | 560 | * tn->full_children) >= |
19baf839 | 561 | * inflate_threshold * tnode_child_length(tn) * 2 |
c877efb2 | 562 | * |
19baf839 | 563 | * shorten again: |
c877efb2 | 564 | * 50 * (tn->full_children + tnode_child_length(tn) - |
91b9a277 | 565 | * tn->empty_children) >= inflate_threshold * |
19baf839 | 566 | * tnode_child_length(tn) |
c877efb2 | 567 | * |
19baf839 RO |
568 | */ |
569 | ||
570 | check_tnode(tn); | |
c877efb2 | 571 | |
e6308be8 RO |
572 | /* Keep root node larger */ |
573 | ||
132adf54 | 574 | if (!tn->parent) |
e6308be8 | 575 | inflate_threshold_use = inflate_threshold_root; |
e905a9ed | 576 | else |
e6308be8 RO |
577 | inflate_threshold_use = inflate_threshold; |
578 | ||
2f36895a | 579 | err = 0; |
05eee48c RO |
580 | max_resize = 10; |
581 | while ((tn->full_children > 0 && max_resize-- && | |
a07f5f50 SH |
582 | 50 * (tn->full_children + tnode_child_length(tn) |
583 | - tn->empty_children) | |
584 | >= inflate_threshold_use * tnode_child_length(tn))) { | |
19baf839 | 585 | |
2f80b3c8 RO |
586 | old_tn = tn; |
587 | tn = inflate(t, tn); | |
a07f5f50 | 588 | |
2f80b3c8 RO |
589 | if (IS_ERR(tn)) { |
590 | tn = old_tn; | |
2f36895a RO |
591 | #ifdef CONFIG_IP_FIB_TRIE_STATS |
592 | t->stats.resize_node_skipped++; | |
593 | #endif | |
594 | break; | |
595 | } | |
19baf839 RO |
596 | } |
597 | ||
05eee48c RO |
598 | if (max_resize < 0) { |
599 | if (!tn->parent) | |
a07f5f50 SH |
600 | pr_warning("Fix inflate_threshold_root." |
601 | " Now=%d size=%d bits\n", | |
602 | inflate_threshold_root, tn->bits); | |
05eee48c | 603 | else |
a07f5f50 SH |
604 | pr_warning("Fix inflate_threshold." |
605 | " Now=%d size=%d bits\n", | |
606 | inflate_threshold, tn->bits); | |
05eee48c RO |
607 | } |
608 | ||
19baf839 RO |
609 | check_tnode(tn); |
610 | ||
611 | /* | |
612 | * Halve as long as the number of empty children in this | |
613 | * node is above threshold. | |
614 | */ | |
2f36895a | 615 | |
e6308be8 RO |
616 | |
617 | /* Keep root node larger */ | |
618 | ||
132adf54 | 619 | if (!tn->parent) |
e6308be8 | 620 | halve_threshold_use = halve_threshold_root; |
e905a9ed | 621 | else |
e6308be8 RO |
622 | halve_threshold_use = halve_threshold; |
623 | ||
2f36895a | 624 | err = 0; |
05eee48c RO |
625 | max_resize = 10; |
626 | while (tn->bits > 1 && max_resize-- && | |
19baf839 | 627 | 100 * (tnode_child_length(tn) - tn->empty_children) < |
e6308be8 | 628 | halve_threshold_use * tnode_child_length(tn)) { |
2f36895a | 629 | |
2f80b3c8 RO |
630 | old_tn = tn; |
631 | tn = halve(t, tn); | |
632 | if (IS_ERR(tn)) { | |
633 | tn = old_tn; | |
2f36895a RO |
634 | #ifdef CONFIG_IP_FIB_TRIE_STATS |
635 | t->stats.resize_node_skipped++; | |
636 | #endif | |
637 | break; | |
638 | } | |
639 | } | |
19baf839 | 640 | |
05eee48c RO |
641 | if (max_resize < 0) { |
642 | if (!tn->parent) | |
a07f5f50 SH |
643 | pr_warning("Fix halve_threshold_root." |
644 | " Now=%d size=%d bits\n", | |
645 | halve_threshold_root, tn->bits); | |
05eee48c | 646 | else |
a07f5f50 SH |
647 | pr_warning("Fix halve_threshold." |
648 | " Now=%d size=%d bits\n", | |
649 | halve_threshold, tn->bits); | |
05eee48c | 650 | } |
c877efb2 | 651 | |
19baf839 | 652 | /* Only one child remains */ |
19baf839 RO |
653 | if (tn->empty_children == tnode_child_length(tn) - 1) |
654 | for (i = 0; i < tnode_child_length(tn); i++) { | |
91b9a277 | 655 | struct node *n; |
19baf839 | 656 | |
91b9a277 | 657 | n = tn->child[i]; |
2373ce1c | 658 | if (!n) |
91b9a277 | 659 | continue; |
91b9a277 OJ |
660 | |
661 | /* compress one level */ | |
662 | ||
06801916 | 663 | node_set_parent(n, NULL); |
91b9a277 OJ |
664 | tnode_free(tn); |
665 | return n; | |
19baf839 RO |
666 | } |
667 | ||
668 | return (struct node *) tn; | |
669 | } | |
670 | ||
2f80b3c8 | 671 | static struct tnode *inflate(struct trie *t, struct tnode *tn) |
19baf839 | 672 | { |
19baf839 RO |
673 | struct tnode *oldtnode = tn; |
674 | int olen = tnode_child_length(tn); | |
675 | int i; | |
676 | ||
0c7770c7 | 677 | pr_debug("In inflate\n"); |
19baf839 RO |
678 | |
679 | tn = tnode_new(oldtnode->key, oldtnode->pos, oldtnode->bits + 1); | |
680 | ||
0c7770c7 | 681 | if (!tn) |
2f80b3c8 | 682 | return ERR_PTR(-ENOMEM); |
2f36895a RO |
683 | |
684 | /* | |
c877efb2 SH |
685 | * Preallocate and store tnodes before the actual work so we |
686 | * don't get into an inconsistent state if memory allocation | |
687 | * fails. In case of failure we return the oldnode and inflate | |
2f36895a RO |
688 | * of tnode is ignored. |
689 | */ | |
91b9a277 OJ |
690 | |
691 | for (i = 0; i < olen; i++) { | |
a07f5f50 | 692 | struct tnode *inode; |
2f36895a | 693 | |
a07f5f50 | 694 | inode = (struct tnode *) tnode_get_child(oldtnode, i); |
2f36895a RO |
695 | if (inode && |
696 | IS_TNODE(inode) && | |
697 | inode->pos == oldtnode->pos + oldtnode->bits && | |
698 | inode->bits > 1) { | |
699 | struct tnode *left, *right; | |
ab66b4a7 | 700 | t_key m = ~0U << (KEYLENGTH - 1) >> inode->pos; |
c877efb2 | 701 | |
2f36895a RO |
702 | left = tnode_new(inode->key&(~m), inode->pos + 1, |
703 | inode->bits - 1); | |
2f80b3c8 RO |
704 | if (!left) |
705 | goto nomem; | |
91b9a277 | 706 | |
2f36895a RO |
707 | right = tnode_new(inode->key|m, inode->pos + 1, |
708 | inode->bits - 1); | |
709 | ||
e905a9ed | 710 | if (!right) { |
2f80b3c8 RO |
711 | tnode_free(left); |
712 | goto nomem; | |
e905a9ed | 713 | } |
2f36895a RO |
714 | |
715 | put_child(t, tn, 2*i, (struct node *) left); | |
716 | put_child(t, tn, 2*i+1, (struct node *) right); | |
717 | } | |
718 | } | |
719 | ||
91b9a277 | 720 | for (i = 0; i < olen; i++) { |
c95aaf9a | 721 | struct tnode *inode; |
19baf839 | 722 | struct node *node = tnode_get_child(oldtnode, i); |
91b9a277 OJ |
723 | struct tnode *left, *right; |
724 | int size, j; | |
c877efb2 | 725 | |
19baf839 RO |
726 | /* An empty child */ |
727 | if (node == NULL) | |
728 | continue; | |
729 | ||
730 | /* A leaf or an internal node with skipped bits */ | |
731 | ||
c877efb2 | 732 | if (IS_LEAF(node) || ((struct tnode *) node)->pos > |
19baf839 | 733 | tn->pos + tn->bits - 1) { |
a07f5f50 SH |
734 | if (tkey_extract_bits(node->key, |
735 | oldtnode->pos + oldtnode->bits, | |
736 | 1) == 0) | |
19baf839 RO |
737 | put_child(t, tn, 2*i, node); |
738 | else | |
739 | put_child(t, tn, 2*i+1, node); | |
740 | continue; | |
741 | } | |
742 | ||
743 | /* An internal node with two children */ | |
744 | inode = (struct tnode *) node; | |
745 | ||
746 | if (inode->bits == 1) { | |
747 | put_child(t, tn, 2*i, inode->child[0]); | |
748 | put_child(t, tn, 2*i+1, inode->child[1]); | |
749 | ||
750 | tnode_free(inode); | |
91b9a277 | 751 | continue; |
19baf839 RO |
752 | } |
753 | ||
91b9a277 OJ |
754 | /* An internal node with more than two children */ |
755 | ||
756 | /* We will replace this node 'inode' with two new | |
757 | * ones, 'left' and 'right', each with half of the | |
758 | * original children. The two new nodes will have | |
759 | * a position one bit further down the key and this | |
760 | * means that the "significant" part of their keys | |
761 | * (see the discussion near the top of this file) | |
762 | * will differ by one bit, which will be "0" in | |
763 | * left's key and "1" in right's key. Since we are | |
764 | * moving the key position by one step, the bit that | |
765 | * we are moving away from - the bit at position | |
766 | * (inode->pos) - is the one that will differ between | |
767 | * left and right. So... we synthesize that bit in the | |
768 | * two new keys. | |
769 | * The mask 'm' below will be a single "one" bit at | |
770 | * the position (inode->pos) | |
771 | */ | |
19baf839 | 772 | |
91b9a277 OJ |
773 | /* Use the old key, but set the new significant |
774 | * bit to zero. | |
775 | */ | |
2f36895a | 776 | |
91b9a277 OJ |
777 | left = (struct tnode *) tnode_get_child(tn, 2*i); |
778 | put_child(t, tn, 2*i, NULL); | |
2f36895a | 779 | |
91b9a277 | 780 | BUG_ON(!left); |
2f36895a | 781 | |
91b9a277 OJ |
782 | right = (struct tnode *) tnode_get_child(tn, 2*i+1); |
783 | put_child(t, tn, 2*i+1, NULL); | |
19baf839 | 784 | |
91b9a277 | 785 | BUG_ON(!right); |
19baf839 | 786 | |
91b9a277 OJ |
787 | size = tnode_child_length(left); |
788 | for (j = 0; j < size; j++) { | |
789 | put_child(t, left, j, inode->child[j]); | |
790 | put_child(t, right, j, inode->child[j + size]); | |
19baf839 | 791 | } |
91b9a277 OJ |
792 | put_child(t, tn, 2*i, resize(t, left)); |
793 | put_child(t, tn, 2*i+1, resize(t, right)); | |
794 | ||
795 | tnode_free(inode); | |
19baf839 RO |
796 | } |
797 | tnode_free(oldtnode); | |
798 | return tn; | |
2f80b3c8 RO |
799 | nomem: |
800 | { | |
801 | int size = tnode_child_length(tn); | |
802 | int j; | |
803 | ||
0c7770c7 | 804 | for (j = 0; j < size; j++) |
2f80b3c8 RO |
805 | if (tn->child[j]) |
806 | tnode_free((struct tnode *)tn->child[j]); | |
807 | ||
808 | tnode_free(tn); | |
0c7770c7 | 809 | |
2f80b3c8 RO |
810 | return ERR_PTR(-ENOMEM); |
811 | } | |
19baf839 RO |
812 | } |
813 | ||
2f80b3c8 | 814 | static struct tnode *halve(struct trie *t, struct tnode *tn) |
19baf839 RO |
815 | { |
816 | struct tnode *oldtnode = tn; | |
817 | struct node *left, *right; | |
818 | int i; | |
819 | int olen = tnode_child_length(tn); | |
820 | ||
0c7770c7 | 821 | pr_debug("In halve\n"); |
c877efb2 SH |
822 | |
823 | tn = tnode_new(oldtnode->key, oldtnode->pos, oldtnode->bits - 1); | |
19baf839 | 824 | |
2f80b3c8 RO |
825 | if (!tn) |
826 | return ERR_PTR(-ENOMEM); | |
2f36895a RO |
827 | |
828 | /* | |
c877efb2 SH |
829 | * Preallocate and store tnodes before the actual work so we |
830 | * don't get into an inconsistent state if memory allocation | |
831 | * fails. In case of failure we return the oldnode and halve | |
2f36895a RO |
832 | * of tnode is ignored. |
833 | */ | |
834 | ||
91b9a277 | 835 | for (i = 0; i < olen; i += 2) { |
2f36895a RO |
836 | left = tnode_get_child(oldtnode, i); |
837 | right = tnode_get_child(oldtnode, i+1); | |
c877efb2 | 838 | |
2f36895a | 839 | /* Two nonempty children */ |
0c7770c7 | 840 | if (left && right) { |
2f80b3c8 | 841 | struct tnode *newn; |
0c7770c7 | 842 | |
2f80b3c8 | 843 | newn = tnode_new(left->key, tn->pos + tn->bits, 1); |
0c7770c7 SH |
844 | |
845 | if (!newn) | |
2f80b3c8 | 846 | goto nomem; |
0c7770c7 | 847 | |
2f80b3c8 | 848 | put_child(t, tn, i/2, (struct node *)newn); |
2f36895a | 849 | } |
2f36895a | 850 | |
2f36895a | 851 | } |
19baf839 | 852 | |
91b9a277 OJ |
853 | for (i = 0; i < olen; i += 2) { |
854 | struct tnode *newBinNode; | |
855 | ||
19baf839 RO |
856 | left = tnode_get_child(oldtnode, i); |
857 | right = tnode_get_child(oldtnode, i+1); | |
c877efb2 | 858 | |
19baf839 RO |
859 | /* At least one of the children is empty */ |
860 | if (left == NULL) { | |
861 | if (right == NULL) /* Both are empty */ | |
862 | continue; | |
863 | put_child(t, tn, i/2, right); | |
91b9a277 | 864 | continue; |
0c7770c7 | 865 | } |
91b9a277 OJ |
866 | |
867 | if (right == NULL) { | |
19baf839 | 868 | put_child(t, tn, i/2, left); |
91b9a277 OJ |
869 | continue; |
870 | } | |
c877efb2 | 871 | |
19baf839 | 872 | /* Two nonempty children */ |
91b9a277 OJ |
873 | newBinNode = (struct tnode *) tnode_get_child(tn, i/2); |
874 | put_child(t, tn, i/2, NULL); | |
91b9a277 OJ |
875 | put_child(t, newBinNode, 0, left); |
876 | put_child(t, newBinNode, 1, right); | |
877 | put_child(t, tn, i/2, resize(t, newBinNode)); | |
19baf839 RO |
878 | } |
879 | tnode_free(oldtnode); | |
880 | return tn; | |
2f80b3c8 RO |
881 | nomem: |
882 | { | |
883 | int size = tnode_child_length(tn); | |
884 | int j; | |
885 | ||
0c7770c7 | 886 | for (j = 0; j < size; j++) |
2f80b3c8 RO |
887 | if (tn->child[j]) |
888 | tnode_free((struct tnode *)tn->child[j]); | |
889 | ||
890 | tnode_free(tn); | |
0c7770c7 | 891 | |
2f80b3c8 RO |
892 | return ERR_PTR(-ENOMEM); |
893 | } | |
19baf839 RO |
894 | } |
895 | ||
772cb712 | 896 | /* readside must use rcu_read_lock currently dump routines |
2373ce1c RO |
897 | via get_fa_head and dump */ |
898 | ||
772cb712 | 899 | static struct leaf_info *find_leaf_info(struct leaf *l, int plen) |
19baf839 | 900 | { |
772cb712 | 901 | struct hlist_head *head = &l->list; |
19baf839 RO |
902 | struct hlist_node *node; |
903 | struct leaf_info *li; | |
904 | ||
2373ce1c | 905 | hlist_for_each_entry_rcu(li, node, head, hlist) |
c877efb2 | 906 | if (li->plen == plen) |
19baf839 | 907 | return li; |
91b9a277 | 908 | |
19baf839 RO |
909 | return NULL; |
910 | } | |
911 | ||
a07f5f50 | 912 | static inline struct list_head *get_fa_head(struct leaf *l, int plen) |
19baf839 | 913 | { |
772cb712 | 914 | struct leaf_info *li = find_leaf_info(l, plen); |
c877efb2 | 915 | |
91b9a277 OJ |
916 | if (!li) |
917 | return NULL; | |
c877efb2 | 918 | |
91b9a277 | 919 | return &li->falh; |
19baf839 RO |
920 | } |
921 | ||
922 | static void insert_leaf_info(struct hlist_head *head, struct leaf_info *new) | |
923 | { | |
e905a9ed YH |
924 | struct leaf_info *li = NULL, *last = NULL; |
925 | struct hlist_node *node; | |
926 | ||
927 | if (hlist_empty(head)) { | |
928 | hlist_add_head_rcu(&new->hlist, head); | |
929 | } else { | |
930 | hlist_for_each_entry(li, node, head, hlist) { | |
931 | if (new->plen > li->plen) | |
932 | break; | |
933 | ||
934 | last = li; | |
935 | } | |
936 | if (last) | |
937 | hlist_add_after_rcu(&last->hlist, &new->hlist); | |
938 | else | |
939 | hlist_add_before_rcu(&new->hlist, &li->hlist); | |
940 | } | |
19baf839 RO |
941 | } |
942 | ||
2373ce1c RO |
943 | /* rcu_read_lock needs to be hold by caller from readside */ |
944 | ||
19baf839 RO |
945 | static struct leaf * |
946 | fib_find_node(struct trie *t, u32 key) | |
947 | { | |
948 | int pos; | |
949 | struct tnode *tn; | |
950 | struct node *n; | |
951 | ||
952 | pos = 0; | |
2373ce1c | 953 | n = rcu_dereference(t->trie); |
19baf839 RO |
954 | |
955 | while (n != NULL && NODE_TYPE(n) == T_TNODE) { | |
956 | tn = (struct tnode *) n; | |
91b9a277 | 957 | |
19baf839 | 958 | check_tnode(tn); |
91b9a277 | 959 | |
c877efb2 | 960 | if (tkey_sub_equals(tn->key, pos, tn->pos-pos, key)) { |
91b9a277 | 961 | pos = tn->pos + tn->bits; |
a07f5f50 SH |
962 | n = tnode_get_child_rcu(tn, |
963 | tkey_extract_bits(key, | |
964 | tn->pos, | |
965 | tn->bits)); | |
91b9a277 | 966 | } else |
19baf839 RO |
967 | break; |
968 | } | |
969 | /* Case we have found a leaf. Compare prefixes */ | |
970 | ||
91b9a277 OJ |
971 | if (n != NULL && IS_LEAF(n) && tkey_equals(key, n->key)) |
972 | return (struct leaf *)n; | |
973 | ||
19baf839 RO |
974 | return NULL; |
975 | } | |
976 | ||
977 | static struct node *trie_rebalance(struct trie *t, struct tnode *tn) | |
978 | { | |
19baf839 | 979 | int wasfull; |
06801916 SH |
980 | t_key cindex, key = tn->key; |
981 | struct tnode *tp; | |
19baf839 | 982 | |
06801916 | 983 | while (tn != NULL && (tp = node_parent((struct node *)tn)) != NULL) { |
19baf839 RO |
984 | cindex = tkey_extract_bits(key, tp->pos, tp->bits); |
985 | wasfull = tnode_full(tp, tnode_get_child(tp, cindex)); | |
a07f5f50 SH |
986 | tn = (struct tnode *) resize(t, (struct tnode *)tn); |
987 | ||
988 | tnode_put_child_reorg((struct tnode *)tp, cindex, | |
989 | (struct node *)tn, wasfull); | |
91b9a277 | 990 | |
06801916 SH |
991 | tp = node_parent((struct node *) tn); |
992 | if (!tp) | |
19baf839 | 993 | break; |
06801916 | 994 | tn = tp; |
19baf839 | 995 | } |
06801916 | 996 | |
19baf839 | 997 | /* Handle last (top) tnode */ |
c877efb2 | 998 | if (IS_TNODE(tn)) |
a07f5f50 | 999 | tn = (struct tnode *)resize(t, (struct tnode *)tn); |
19baf839 | 1000 | |
a07f5f50 | 1001 | return (struct node *)tn; |
19baf839 RO |
1002 | } |
1003 | ||
2373ce1c RO |
1004 | /* only used from updater-side */ |
1005 | ||
fea86ad8 | 1006 | static struct list_head *fib_insert_node(struct trie *t, u32 key, int plen) |
19baf839 RO |
1007 | { |
1008 | int pos, newpos; | |
1009 | struct tnode *tp = NULL, *tn = NULL; | |
1010 | struct node *n; | |
1011 | struct leaf *l; | |
1012 | int missbit; | |
c877efb2 | 1013 | struct list_head *fa_head = NULL; |
19baf839 RO |
1014 | struct leaf_info *li; |
1015 | t_key cindex; | |
1016 | ||
1017 | pos = 0; | |
c877efb2 | 1018 | n = t->trie; |
19baf839 | 1019 | |
c877efb2 SH |
1020 | /* If we point to NULL, stop. Either the tree is empty and we should |
1021 | * just put a new leaf in if, or we have reached an empty child slot, | |
19baf839 | 1022 | * and we should just put our new leaf in that. |
c877efb2 SH |
1023 | * If we point to a T_TNODE, check if it matches our key. Note that |
1024 | * a T_TNODE might be skipping any number of bits - its 'pos' need | |
19baf839 RO |
1025 | * not be the parent's 'pos'+'bits'! |
1026 | * | |
c877efb2 | 1027 | * If it does match the current key, get pos/bits from it, extract |
19baf839 RO |
1028 | * the index from our key, push the T_TNODE and walk the tree. |
1029 | * | |
1030 | * If it doesn't, we have to replace it with a new T_TNODE. | |
1031 | * | |
c877efb2 SH |
1032 | * If we point to a T_LEAF, it might or might not have the same key |
1033 | * as we do. If it does, just change the value, update the T_LEAF's | |
1034 | * value, and return it. | |
19baf839 RO |
1035 | * If it doesn't, we need to replace it with a T_TNODE. |
1036 | */ | |
1037 | ||
1038 | while (n != NULL && NODE_TYPE(n) == T_TNODE) { | |
1039 | tn = (struct tnode *) n; | |
91b9a277 | 1040 | |
c877efb2 | 1041 | check_tnode(tn); |
91b9a277 | 1042 | |
c877efb2 | 1043 | if (tkey_sub_equals(tn->key, pos, tn->pos-pos, key)) { |
19baf839 | 1044 | tp = tn; |
91b9a277 | 1045 | pos = tn->pos + tn->bits; |
a07f5f50 SH |
1046 | n = tnode_get_child(tn, |
1047 | tkey_extract_bits(key, | |
1048 | tn->pos, | |
1049 | tn->bits)); | |
19baf839 | 1050 | |
06801916 | 1051 | BUG_ON(n && node_parent(n) != tn); |
91b9a277 | 1052 | } else |
19baf839 RO |
1053 | break; |
1054 | } | |
1055 | ||
1056 | /* | |
1057 | * n ----> NULL, LEAF or TNODE | |
1058 | * | |
c877efb2 | 1059 | * tp is n's (parent) ----> NULL or TNODE |
19baf839 RO |
1060 | */ |
1061 | ||
91b9a277 | 1062 | BUG_ON(tp && IS_LEAF(tp)); |
19baf839 RO |
1063 | |
1064 | /* Case 1: n is a leaf. Compare prefixes */ | |
1065 | ||
c877efb2 | 1066 | if (n != NULL && IS_LEAF(n) && tkey_equals(key, n->key)) { |
c95aaf9a | 1067 | l = (struct leaf *) n; |
19baf839 | 1068 | li = leaf_info_new(plen); |
91b9a277 | 1069 | |
fea86ad8 SH |
1070 | if (!li) |
1071 | return NULL; | |
19baf839 RO |
1072 | |
1073 | fa_head = &li->falh; | |
1074 | insert_leaf_info(&l->list, li); | |
1075 | goto done; | |
1076 | } | |
19baf839 RO |
1077 | l = leaf_new(); |
1078 | ||
fea86ad8 SH |
1079 | if (!l) |
1080 | return NULL; | |
19baf839 RO |
1081 | |
1082 | l->key = key; | |
1083 | li = leaf_info_new(plen); | |
1084 | ||
c877efb2 | 1085 | if (!li) { |
f835e471 | 1086 | tnode_free((struct tnode *) l); |
fea86ad8 | 1087 | return NULL; |
f835e471 | 1088 | } |
19baf839 RO |
1089 | |
1090 | fa_head = &li->falh; | |
1091 | insert_leaf_info(&l->list, li); | |
1092 | ||
19baf839 | 1093 | if (t->trie && n == NULL) { |
91b9a277 | 1094 | /* Case 2: n is NULL, and will just insert a new leaf */ |
19baf839 | 1095 | |
06801916 | 1096 | node_set_parent((struct node *)l, tp); |
19baf839 | 1097 | |
91b9a277 OJ |
1098 | cindex = tkey_extract_bits(key, tp->pos, tp->bits); |
1099 | put_child(t, (struct tnode *)tp, cindex, (struct node *)l); | |
1100 | } else { | |
1101 | /* Case 3: n is a LEAF or a TNODE and the key doesn't match. */ | |
c877efb2 SH |
1102 | /* |
1103 | * Add a new tnode here | |
19baf839 RO |
1104 | * first tnode need some special handling |
1105 | */ | |
1106 | ||
1107 | if (tp) | |
91b9a277 | 1108 | pos = tp->pos+tp->bits; |
19baf839 | 1109 | else |
91b9a277 OJ |
1110 | pos = 0; |
1111 | ||
c877efb2 | 1112 | if (n) { |
19baf839 RO |
1113 | newpos = tkey_mismatch(key, pos, n->key); |
1114 | tn = tnode_new(n->key, newpos, 1); | |
91b9a277 | 1115 | } else { |
19baf839 | 1116 | newpos = 0; |
c877efb2 | 1117 | tn = tnode_new(key, newpos, 1); /* First tnode */ |
19baf839 | 1118 | } |
19baf839 | 1119 | |
c877efb2 | 1120 | if (!tn) { |
f835e471 RO |
1121 | free_leaf_info(li); |
1122 | tnode_free((struct tnode *) l); | |
fea86ad8 | 1123 | return NULL; |
91b9a277 OJ |
1124 | } |
1125 | ||
06801916 | 1126 | node_set_parent((struct node *)tn, tp); |
19baf839 | 1127 | |
91b9a277 | 1128 | missbit = tkey_extract_bits(key, newpos, 1); |
19baf839 RO |
1129 | put_child(t, tn, missbit, (struct node *)l); |
1130 | put_child(t, tn, 1-missbit, n); | |
1131 | ||
c877efb2 | 1132 | if (tp) { |
19baf839 | 1133 | cindex = tkey_extract_bits(key, tp->pos, tp->bits); |
a07f5f50 SH |
1134 | put_child(t, (struct tnode *)tp, cindex, |
1135 | (struct node *)tn); | |
91b9a277 | 1136 | } else { |
a07f5f50 | 1137 | rcu_assign_pointer(t->trie, (struct node *)tn); |
19baf839 RO |
1138 | tp = tn; |
1139 | } | |
1140 | } | |
91b9a277 OJ |
1141 | |
1142 | if (tp && tp->pos + tp->bits > 32) | |
a07f5f50 SH |
1143 | pr_warning("fib_trie" |
1144 | " tp=%p pos=%d, bits=%d, key=%0x plen=%d\n", | |
1145 | tp, tp->pos, tp->bits, key, plen); | |
91b9a277 | 1146 | |
19baf839 | 1147 | /* Rebalance the trie */ |
2373ce1c RO |
1148 | |
1149 | rcu_assign_pointer(t->trie, trie_rebalance(t, tp)); | |
f835e471 | 1150 | done: |
19baf839 RO |
1151 | return fa_head; |
1152 | } | |
1153 | ||
d562f1f8 RO |
1154 | /* |
1155 | * Caller must hold RTNL. | |
1156 | */ | |
4e902c57 | 1157 | static int fn_trie_insert(struct fib_table *tb, struct fib_config *cfg) |
19baf839 RO |
1158 | { |
1159 | struct trie *t = (struct trie *) tb->tb_data; | |
1160 | struct fib_alias *fa, *new_fa; | |
c877efb2 | 1161 | struct list_head *fa_head = NULL; |
19baf839 | 1162 | struct fib_info *fi; |
4e902c57 TG |
1163 | int plen = cfg->fc_dst_len; |
1164 | u8 tos = cfg->fc_tos; | |
19baf839 RO |
1165 | u32 key, mask; |
1166 | int err; | |
1167 | struct leaf *l; | |
1168 | ||
1169 | if (plen > 32) | |
1170 | return -EINVAL; | |
1171 | ||
4e902c57 | 1172 | key = ntohl(cfg->fc_dst); |
19baf839 | 1173 | |
2dfe55b4 | 1174 | pr_debug("Insert table=%u %08x/%d\n", tb->tb_id, key, plen); |
19baf839 | 1175 | |
91b9a277 | 1176 | mask = ntohl(inet_make_mask(plen)); |
19baf839 | 1177 | |
c877efb2 | 1178 | if (key & ~mask) |
19baf839 RO |
1179 | return -EINVAL; |
1180 | ||
1181 | key = key & mask; | |
1182 | ||
4e902c57 TG |
1183 | fi = fib_create_info(cfg); |
1184 | if (IS_ERR(fi)) { | |
1185 | err = PTR_ERR(fi); | |
19baf839 | 1186 | goto err; |
4e902c57 | 1187 | } |
19baf839 RO |
1188 | |
1189 | l = fib_find_node(t, key); | |
c877efb2 | 1190 | fa = NULL; |
19baf839 | 1191 | |
c877efb2 | 1192 | if (l) { |
19baf839 RO |
1193 | fa_head = get_fa_head(l, plen); |
1194 | fa = fib_find_alias(fa_head, tos, fi->fib_priority); | |
1195 | } | |
1196 | ||
1197 | /* Now fa, if non-NULL, points to the first fib alias | |
1198 | * with the same keys [prefix,tos,priority], if such key already | |
1199 | * exists or to the node before which we will insert new one. | |
1200 | * | |
1201 | * If fa is NULL, we will need to allocate a new one and | |
1202 | * insert to the head of f. | |
1203 | * | |
1204 | * If f is NULL, no fib node matched the destination key | |
1205 | * and we need to allocate a new one of those as well. | |
1206 | */ | |
1207 | ||
91b9a277 | 1208 | if (fa && fa->fa_info->fib_priority == fi->fib_priority) { |
19baf839 RO |
1209 | struct fib_alias *fa_orig; |
1210 | ||
1211 | err = -EEXIST; | |
4e902c57 | 1212 | if (cfg->fc_nlflags & NLM_F_EXCL) |
19baf839 RO |
1213 | goto out; |
1214 | ||
4e902c57 | 1215 | if (cfg->fc_nlflags & NLM_F_REPLACE) { |
19baf839 RO |
1216 | struct fib_info *fi_drop; |
1217 | u8 state; | |
1218 | ||
6725033f JP |
1219 | if (fi->fib_treeref > 1) |
1220 | goto out; | |
1221 | ||
2373ce1c | 1222 | err = -ENOBUFS; |
e94b1766 | 1223 | new_fa = kmem_cache_alloc(fn_alias_kmem, GFP_KERNEL); |
2373ce1c RO |
1224 | if (new_fa == NULL) |
1225 | goto out; | |
19baf839 RO |
1226 | |
1227 | fi_drop = fa->fa_info; | |
2373ce1c RO |
1228 | new_fa->fa_tos = fa->fa_tos; |
1229 | new_fa->fa_info = fi; | |
4e902c57 TG |
1230 | new_fa->fa_type = cfg->fc_type; |
1231 | new_fa->fa_scope = cfg->fc_scope; | |
19baf839 | 1232 | state = fa->fa_state; |
2373ce1c | 1233 | new_fa->fa_state &= ~FA_S_ACCESSED; |
19baf839 | 1234 | |
2373ce1c RO |
1235 | list_replace_rcu(&fa->fa_list, &new_fa->fa_list); |
1236 | alias_free_mem_rcu(fa); | |
19baf839 RO |
1237 | |
1238 | fib_release_info(fi_drop); | |
1239 | if (state & FA_S_ACCESSED) | |
91b9a277 | 1240 | rt_cache_flush(-1); |
b8f55831 MK |
1241 | rtmsg_fib(RTM_NEWROUTE, htonl(key), new_fa, plen, |
1242 | tb->tb_id, &cfg->fc_nlinfo, NLM_F_REPLACE); | |
19baf839 | 1243 | |
91b9a277 | 1244 | goto succeeded; |
19baf839 RO |
1245 | } |
1246 | /* Error if we find a perfect match which | |
1247 | * uses the same scope, type, and nexthop | |
1248 | * information. | |
1249 | */ | |
1250 | fa_orig = fa; | |
1251 | list_for_each_entry(fa, fa_orig->fa_list.prev, fa_list) { | |
1252 | if (fa->fa_tos != tos) | |
1253 | break; | |
1254 | if (fa->fa_info->fib_priority != fi->fib_priority) | |
1255 | break; | |
4e902c57 TG |
1256 | if (fa->fa_type == cfg->fc_type && |
1257 | fa->fa_scope == cfg->fc_scope && | |
a07f5f50 | 1258 | fa->fa_info == fi) |
19baf839 | 1259 | goto out; |
19baf839 | 1260 | } |
a07f5f50 | 1261 | |
4e902c57 | 1262 | if (!(cfg->fc_nlflags & NLM_F_APPEND)) |
19baf839 RO |
1263 | fa = fa_orig; |
1264 | } | |
1265 | err = -ENOENT; | |
4e902c57 | 1266 | if (!(cfg->fc_nlflags & NLM_F_CREATE)) |
19baf839 RO |
1267 | goto out; |
1268 | ||
1269 | err = -ENOBUFS; | |
e94b1766 | 1270 | new_fa = kmem_cache_alloc(fn_alias_kmem, GFP_KERNEL); |
19baf839 RO |
1271 | if (new_fa == NULL) |
1272 | goto out; | |
1273 | ||
1274 | new_fa->fa_info = fi; | |
1275 | new_fa->fa_tos = tos; | |
4e902c57 TG |
1276 | new_fa->fa_type = cfg->fc_type; |
1277 | new_fa->fa_scope = cfg->fc_scope; | |
19baf839 | 1278 | new_fa->fa_state = 0; |
19baf839 RO |
1279 | /* |
1280 | * Insert new entry to the list. | |
1281 | */ | |
1282 | ||
c877efb2 | 1283 | if (!fa_head) { |
fea86ad8 SH |
1284 | fa_head = fib_insert_node(t, key, plen); |
1285 | if (unlikely(!fa_head)) { | |
1286 | err = -ENOMEM; | |
f835e471 | 1287 | goto out_free_new_fa; |
fea86ad8 | 1288 | } |
f835e471 | 1289 | } |
19baf839 | 1290 | |
2373ce1c RO |
1291 | list_add_tail_rcu(&new_fa->fa_list, |
1292 | (fa ? &fa->fa_list : fa_head)); | |
19baf839 RO |
1293 | |
1294 | rt_cache_flush(-1); | |
4e902c57 | 1295 | rtmsg_fib(RTM_NEWROUTE, htonl(key), new_fa, plen, tb->tb_id, |
b8f55831 | 1296 | &cfg->fc_nlinfo, 0); |
19baf839 RO |
1297 | succeeded: |
1298 | return 0; | |
f835e471 RO |
1299 | |
1300 | out_free_new_fa: | |
1301 | kmem_cache_free(fn_alias_kmem, new_fa); | |
19baf839 RO |
1302 | out: |
1303 | fib_release_info(fi); | |
91b9a277 | 1304 | err: |
19baf839 RO |
1305 | return err; |
1306 | } | |
1307 | ||
772cb712 | 1308 | /* should be called with rcu_read_lock */ |
a07f5f50 SH |
1309 | static int check_leaf(struct trie *t, struct leaf *l, |
1310 | t_key key, const struct flowi *flp, | |
1311 | struct fib_result *res) | |
19baf839 | 1312 | { |
19baf839 RO |
1313 | struct leaf_info *li; |
1314 | struct hlist_head *hhead = &l->list; | |
1315 | struct hlist_node *node; | |
c877efb2 | 1316 | |
2373ce1c | 1317 | hlist_for_each_entry_rcu(li, node, hhead, hlist) { |
a07f5f50 SH |
1318 | int err; |
1319 | int plen = li->plen; | |
1320 | __be32 mask = inet_make_mask(plen); | |
1321 | ||
888454c5 | 1322 | if (l->key != (key & ntohl(mask))) |
19baf839 RO |
1323 | continue; |
1324 | ||
a07f5f50 SH |
1325 | err = fib_semantic_match(&li->falh, flp, res, |
1326 | htonl(l->key), mask, plen); | |
1327 | ||
19baf839 | 1328 | #ifdef CONFIG_IP_FIB_TRIE_STATS |
a07f5f50 | 1329 | if (err <= 0) |
19baf839 | 1330 | t->stats.semantic_match_passed++; |
a07f5f50 SH |
1331 | else |
1332 | t->stats.semantic_match_miss++; | |
19baf839 | 1333 | #endif |
a07f5f50 SH |
1334 | if (err <= 0) |
1335 | return plen; | |
19baf839 | 1336 | } |
a07f5f50 SH |
1337 | |
1338 | return -1; | |
19baf839 RO |
1339 | } |
1340 | ||
a07f5f50 SH |
1341 | static int fn_trie_lookup(struct fib_table *tb, const struct flowi *flp, |
1342 | struct fib_result *res) | |
19baf839 RO |
1343 | { |
1344 | struct trie *t = (struct trie *) tb->tb_data; | |
1345 | int plen, ret = 0; | |
1346 | struct node *n; | |
1347 | struct tnode *pn; | |
1348 | int pos, bits; | |
91b9a277 | 1349 | t_key key = ntohl(flp->fl4_dst); |
19baf839 RO |
1350 | int chopped_off; |
1351 | t_key cindex = 0; | |
1352 | int current_prefix_length = KEYLENGTH; | |
91b9a277 OJ |
1353 | struct tnode *cn; |
1354 | t_key node_prefix, key_prefix, pref_mismatch; | |
1355 | int mp; | |
1356 | ||
2373ce1c | 1357 | rcu_read_lock(); |
91b9a277 | 1358 | |
2373ce1c | 1359 | n = rcu_dereference(t->trie); |
c877efb2 | 1360 | if (!n) |
19baf839 RO |
1361 | goto failed; |
1362 | ||
1363 | #ifdef CONFIG_IP_FIB_TRIE_STATS | |
1364 | t->stats.gets++; | |
1365 | #endif | |
1366 | ||
1367 | /* Just a leaf? */ | |
1368 | if (IS_LEAF(n)) { | |
a07f5f50 SH |
1369 | plen = check_leaf(t, (struct leaf *)n, key, flp, res); |
1370 | if (plen < 0) | |
1371 | goto failed; | |
1372 | ret = 0; | |
1373 | goto found; | |
19baf839 | 1374 | } |
a07f5f50 | 1375 | |
19baf839 RO |
1376 | pn = (struct tnode *) n; |
1377 | chopped_off = 0; | |
c877efb2 | 1378 | |
91b9a277 | 1379 | while (pn) { |
19baf839 RO |
1380 | pos = pn->pos; |
1381 | bits = pn->bits; | |
1382 | ||
c877efb2 | 1383 | if (!chopped_off) |
ab66b4a7 SH |
1384 | cindex = tkey_extract_bits(mask_pfx(key, current_prefix_length), |
1385 | pos, bits); | |
19baf839 RO |
1386 | |
1387 | n = tnode_get_child(pn, cindex); | |
1388 | ||
1389 | if (n == NULL) { | |
1390 | #ifdef CONFIG_IP_FIB_TRIE_STATS | |
1391 | t->stats.null_node_hit++; | |
1392 | #endif | |
1393 | goto backtrace; | |
1394 | } | |
1395 | ||
91b9a277 | 1396 | if (IS_LEAF(n)) { |
a07f5f50 SH |
1397 | plen = check_leaf(t, (struct leaf *)n, key, flp, res); |
1398 | if (plen < 0) | |
91b9a277 | 1399 | goto backtrace; |
a07f5f50 SH |
1400 | |
1401 | ret = 0; | |
1402 | goto found; | |
91b9a277 OJ |
1403 | } |
1404 | ||
91b9a277 | 1405 | cn = (struct tnode *)n; |
19baf839 | 1406 | |
91b9a277 OJ |
1407 | /* |
1408 | * It's a tnode, and we can do some extra checks here if we | |
1409 | * like, to avoid descending into a dead-end branch. | |
1410 | * This tnode is in the parent's child array at index | |
1411 | * key[p_pos..p_pos+p_bits] but potentially with some bits | |
1412 | * chopped off, so in reality the index may be just a | |
1413 | * subprefix, padded with zero at the end. | |
1414 | * We can also take a look at any skipped bits in this | |
1415 | * tnode - everything up to p_pos is supposed to be ok, | |
1416 | * and the non-chopped bits of the index (se previous | |
1417 | * paragraph) are also guaranteed ok, but the rest is | |
1418 | * considered unknown. | |
1419 | * | |
1420 | * The skipped bits are key[pos+bits..cn->pos]. | |
1421 | */ | |
19baf839 | 1422 | |
91b9a277 OJ |
1423 | /* If current_prefix_length < pos+bits, we are already doing |
1424 | * actual prefix matching, which means everything from | |
1425 | * pos+(bits-chopped_off) onward must be zero along some | |
1426 | * branch of this subtree - otherwise there is *no* valid | |
1427 | * prefix present. Here we can only check the skipped | |
1428 | * bits. Remember, since we have already indexed into the | |
1429 | * parent's child array, we know that the bits we chopped of | |
1430 | * *are* zero. | |
1431 | */ | |
19baf839 | 1432 | |
a07f5f50 SH |
1433 | /* NOTA BENE: Checking only skipped bits |
1434 | for the new node here */ | |
19baf839 | 1435 | |
91b9a277 OJ |
1436 | if (current_prefix_length < pos+bits) { |
1437 | if (tkey_extract_bits(cn->key, current_prefix_length, | |
a07f5f50 SH |
1438 | cn->pos - current_prefix_length) |
1439 | || !(cn->child[0])) | |
91b9a277 OJ |
1440 | goto backtrace; |
1441 | } | |
19baf839 | 1442 | |
91b9a277 OJ |
1443 | /* |
1444 | * If chopped_off=0, the index is fully validated and we | |
1445 | * only need to look at the skipped bits for this, the new, | |
1446 | * tnode. What we actually want to do is to find out if | |
1447 | * these skipped bits match our key perfectly, or if we will | |
1448 | * have to count on finding a matching prefix further down, | |
1449 | * because if we do, we would like to have some way of | |
1450 | * verifying the existence of such a prefix at this point. | |
1451 | */ | |
19baf839 | 1452 | |
91b9a277 OJ |
1453 | /* The only thing we can do at this point is to verify that |
1454 | * any such matching prefix can indeed be a prefix to our | |
1455 | * key, and if the bits in the node we are inspecting that | |
1456 | * do not match our key are not ZERO, this cannot be true. | |
1457 | * Thus, find out where there is a mismatch (before cn->pos) | |
1458 | * and verify that all the mismatching bits are zero in the | |
1459 | * new tnode's key. | |
1460 | */ | |
19baf839 | 1461 | |
a07f5f50 SH |
1462 | /* |
1463 | * Note: We aren't very concerned about the piece of | |
1464 | * the key that precede pn->pos+pn->bits, since these | |
1465 | * have already been checked. The bits after cn->pos | |
1466 | * aren't checked since these are by definition | |
1467 | * "unknown" at this point. Thus, what we want to see | |
1468 | * is if we are about to enter the "prefix matching" | |
1469 | * state, and in that case verify that the skipped | |
1470 | * bits that will prevail throughout this subtree are | |
1471 | * zero, as they have to be if we are to find a | |
1472 | * matching prefix. | |
91b9a277 OJ |
1473 | */ |
1474 | ||
ab66b4a7 SH |
1475 | node_prefix = mask_pfx(cn->key, cn->pos); |
1476 | key_prefix = mask_pfx(key, cn->pos); | |
91b9a277 OJ |
1477 | pref_mismatch = key_prefix^node_prefix; |
1478 | mp = 0; | |
1479 | ||
a07f5f50 SH |
1480 | /* |
1481 | * In short: If skipped bits in this node do not match | |
1482 | * the search key, enter the "prefix matching" | |
1483 | * state.directly. | |
91b9a277 OJ |
1484 | */ |
1485 | if (pref_mismatch) { | |
1486 | while (!(pref_mismatch & (1<<(KEYLENGTH-1)))) { | |
1487 | mp++; | |
a07f5f50 | 1488 | pref_mismatch = pref_mismatch << 1; |
91b9a277 OJ |
1489 | } |
1490 | key_prefix = tkey_extract_bits(cn->key, mp, cn->pos-mp); | |
1491 | ||
1492 | if (key_prefix != 0) | |
1493 | goto backtrace; | |
1494 | ||
1495 | if (current_prefix_length >= cn->pos) | |
1496 | current_prefix_length = mp; | |
c877efb2 | 1497 | } |
a07f5f50 | 1498 | |
91b9a277 OJ |
1499 | pn = (struct tnode *)n; /* Descend */ |
1500 | chopped_off = 0; | |
1501 | continue; | |
1502 | ||
19baf839 RO |
1503 | backtrace: |
1504 | chopped_off++; | |
1505 | ||
1506 | /* As zero don't change the child key (cindex) */ | |
a07f5f50 SH |
1507 | while ((chopped_off <= pn->bits) |
1508 | && !(cindex & (1<<(chopped_off-1)))) | |
19baf839 | 1509 | chopped_off++; |
19baf839 RO |
1510 | |
1511 | /* Decrease current_... with bits chopped off */ | |
1512 | if (current_prefix_length > pn->pos + pn->bits - chopped_off) | |
a07f5f50 SH |
1513 | current_prefix_length = pn->pos + pn->bits |
1514 | - chopped_off; | |
91b9a277 | 1515 | |
19baf839 | 1516 | /* |
c877efb2 | 1517 | * Either we do the actual chop off according or if we have |
19baf839 RO |
1518 | * chopped off all bits in this tnode walk up to our parent. |
1519 | */ | |
1520 | ||
91b9a277 | 1521 | if (chopped_off <= pn->bits) { |
19baf839 | 1522 | cindex &= ~(1 << (chopped_off-1)); |
91b9a277 | 1523 | } else { |
06801916 SH |
1524 | struct tnode *parent = node_parent((struct node *) pn); |
1525 | if (!parent) | |
19baf839 | 1526 | goto failed; |
91b9a277 | 1527 | |
19baf839 | 1528 | /* Get Child's index */ |
06801916 SH |
1529 | cindex = tkey_extract_bits(pn->key, parent->pos, parent->bits); |
1530 | pn = parent; | |
19baf839 RO |
1531 | chopped_off = 0; |
1532 | ||
1533 | #ifdef CONFIG_IP_FIB_TRIE_STATS | |
1534 | t->stats.backtrack++; | |
1535 | #endif | |
1536 | goto backtrace; | |
c877efb2 | 1537 | } |
19baf839 RO |
1538 | } |
1539 | failed: | |
c877efb2 | 1540 | ret = 1; |
19baf839 | 1541 | found: |
2373ce1c | 1542 | rcu_read_unlock(); |
19baf839 RO |
1543 | return ret; |
1544 | } | |
1545 | ||
9195bef7 SH |
1546 | /* |
1547 | * Remove the leaf and return parent. | |
1548 | */ | |
1549 | static void trie_leaf_remove(struct trie *t, struct leaf *l) | |
19baf839 | 1550 | { |
9195bef7 | 1551 | struct tnode *tp = node_parent((struct node *) l); |
c877efb2 | 1552 | |
9195bef7 | 1553 | pr_debug("entering trie_leaf_remove(%p)\n", l); |
19baf839 | 1554 | |
c877efb2 | 1555 | if (tp) { |
9195bef7 | 1556 | t_key cindex = tkey_extract_bits(l->key, tp->pos, tp->bits); |
19baf839 | 1557 | put_child(t, (struct tnode *)tp, cindex, NULL); |
2373ce1c | 1558 | rcu_assign_pointer(t->trie, trie_rebalance(t, tp)); |
91b9a277 | 1559 | } else |
2373ce1c | 1560 | rcu_assign_pointer(t->trie, NULL); |
19baf839 | 1561 | |
9195bef7 | 1562 | tnode_free((struct tnode *) l); |
19baf839 RO |
1563 | } |
1564 | ||
d562f1f8 RO |
1565 | /* |
1566 | * Caller must hold RTNL. | |
1567 | */ | |
4e902c57 | 1568 | static int fn_trie_delete(struct fib_table *tb, struct fib_config *cfg) |
19baf839 RO |
1569 | { |
1570 | struct trie *t = (struct trie *) tb->tb_data; | |
1571 | u32 key, mask; | |
4e902c57 TG |
1572 | int plen = cfg->fc_dst_len; |
1573 | u8 tos = cfg->fc_tos; | |
19baf839 RO |
1574 | struct fib_alias *fa, *fa_to_delete; |
1575 | struct list_head *fa_head; | |
1576 | struct leaf *l; | |
91b9a277 OJ |
1577 | struct leaf_info *li; |
1578 | ||
c877efb2 | 1579 | if (plen > 32) |
19baf839 RO |
1580 | return -EINVAL; |
1581 | ||
4e902c57 | 1582 | key = ntohl(cfg->fc_dst); |
91b9a277 | 1583 | mask = ntohl(inet_make_mask(plen)); |
19baf839 | 1584 | |
c877efb2 | 1585 | if (key & ~mask) |
19baf839 RO |
1586 | return -EINVAL; |
1587 | ||
1588 | key = key & mask; | |
1589 | l = fib_find_node(t, key); | |
1590 | ||
c877efb2 | 1591 | if (!l) |
19baf839 RO |
1592 | return -ESRCH; |
1593 | ||
1594 | fa_head = get_fa_head(l, plen); | |
1595 | fa = fib_find_alias(fa_head, tos, 0); | |
1596 | ||
1597 | if (!fa) | |
1598 | return -ESRCH; | |
1599 | ||
0c7770c7 | 1600 | pr_debug("Deleting %08x/%d tos=%d t=%p\n", key, plen, tos, t); |
19baf839 RO |
1601 | |
1602 | fa_to_delete = NULL; | |
1603 | fa_head = fa->fa_list.prev; | |
2373ce1c | 1604 | |
19baf839 RO |
1605 | list_for_each_entry(fa, fa_head, fa_list) { |
1606 | struct fib_info *fi = fa->fa_info; | |
1607 | ||
1608 | if (fa->fa_tos != tos) | |
1609 | break; | |
1610 | ||
4e902c57 TG |
1611 | if ((!cfg->fc_type || fa->fa_type == cfg->fc_type) && |
1612 | (cfg->fc_scope == RT_SCOPE_NOWHERE || | |
1613 | fa->fa_scope == cfg->fc_scope) && | |
1614 | (!cfg->fc_protocol || | |
1615 | fi->fib_protocol == cfg->fc_protocol) && | |
1616 | fib_nh_match(cfg, fi) == 0) { | |
19baf839 RO |
1617 | fa_to_delete = fa; |
1618 | break; | |
1619 | } | |
1620 | } | |
1621 | ||
91b9a277 OJ |
1622 | if (!fa_to_delete) |
1623 | return -ESRCH; | |
19baf839 | 1624 | |
91b9a277 | 1625 | fa = fa_to_delete; |
4e902c57 | 1626 | rtmsg_fib(RTM_DELROUTE, htonl(key), fa, plen, tb->tb_id, |
b8f55831 | 1627 | &cfg->fc_nlinfo, 0); |
91b9a277 OJ |
1628 | |
1629 | l = fib_find_node(t, key); | |
772cb712 | 1630 | li = find_leaf_info(l, plen); |
19baf839 | 1631 | |
2373ce1c | 1632 | list_del_rcu(&fa->fa_list); |
19baf839 | 1633 | |
91b9a277 | 1634 | if (list_empty(fa_head)) { |
2373ce1c | 1635 | hlist_del_rcu(&li->hlist); |
91b9a277 | 1636 | free_leaf_info(li); |
2373ce1c | 1637 | } |
19baf839 | 1638 | |
91b9a277 | 1639 | if (hlist_empty(&l->list)) |
9195bef7 | 1640 | trie_leaf_remove(t, l); |
19baf839 | 1641 | |
91b9a277 OJ |
1642 | if (fa->fa_state & FA_S_ACCESSED) |
1643 | rt_cache_flush(-1); | |
19baf839 | 1644 | |
2373ce1c RO |
1645 | fib_release_info(fa->fa_info); |
1646 | alias_free_mem_rcu(fa); | |
91b9a277 | 1647 | return 0; |
19baf839 RO |
1648 | } |
1649 | ||
1650 | static int trie_flush_list(struct trie *t, struct list_head *head) | |
1651 | { | |
1652 | struct fib_alias *fa, *fa_node; | |
1653 | int found = 0; | |
1654 | ||
1655 | list_for_each_entry_safe(fa, fa_node, head, fa_list) { | |
1656 | struct fib_info *fi = fa->fa_info; | |
19baf839 | 1657 | |
2373ce1c RO |
1658 | if (fi && (fi->fib_flags & RTNH_F_DEAD)) { |
1659 | list_del_rcu(&fa->fa_list); | |
1660 | fib_release_info(fa->fa_info); | |
1661 | alias_free_mem_rcu(fa); | |
19baf839 RO |
1662 | found++; |
1663 | } | |
1664 | } | |
1665 | return found; | |
1666 | } | |
1667 | ||
1668 | static int trie_flush_leaf(struct trie *t, struct leaf *l) | |
1669 | { | |
1670 | int found = 0; | |
1671 | struct hlist_head *lih = &l->list; | |
1672 | struct hlist_node *node, *tmp; | |
1673 | struct leaf_info *li = NULL; | |
1674 | ||
1675 | hlist_for_each_entry_safe(li, node, tmp, lih, hlist) { | |
19baf839 RO |
1676 | found += trie_flush_list(t, &li->falh); |
1677 | ||
1678 | if (list_empty(&li->falh)) { | |
2373ce1c | 1679 | hlist_del_rcu(&li->hlist); |
19baf839 RO |
1680 | free_leaf_info(li); |
1681 | } | |
1682 | } | |
1683 | return found; | |
1684 | } | |
1685 | ||
82cfbb00 SH |
1686 | /* |
1687 | * Scan for the next right leaf starting at node p->child[idx] | |
1688 | * Since we have back pointer, no recursion necessary. | |
1689 | */ | |
1690 | static struct leaf *leaf_walk_rcu(struct tnode *p, struct node *c) | |
19baf839 | 1691 | { |
82cfbb00 SH |
1692 | do { |
1693 | t_key idx; | |
c877efb2 | 1694 | |
c877efb2 | 1695 | if (c) |
82cfbb00 | 1696 | idx = tkey_extract_bits(c->key, p->pos, p->bits) + 1; |
c877efb2 | 1697 | else |
82cfbb00 | 1698 | idx = 0; |
2373ce1c | 1699 | |
82cfbb00 SH |
1700 | while (idx < 1u << p->bits) { |
1701 | c = tnode_get_child_rcu(p, idx++); | |
2373ce1c | 1702 | if (!c) |
91b9a277 OJ |
1703 | continue; |
1704 | ||
82cfbb00 SH |
1705 | if (IS_LEAF(c)) { |
1706 | prefetch(p->child[idx]); | |
1707 | return (struct leaf *) c; | |
19baf839 | 1708 | } |
82cfbb00 SH |
1709 | |
1710 | /* Rescan start scanning in new node */ | |
1711 | p = (struct tnode *) c; | |
1712 | idx = 0; | |
19baf839 | 1713 | } |
82cfbb00 SH |
1714 | |
1715 | /* Node empty, walk back up to parent */ | |
91b9a277 | 1716 | c = (struct node *) p; |
82cfbb00 SH |
1717 | } while ( (p = node_parent_rcu(c)) != NULL); |
1718 | ||
1719 | return NULL; /* Root of trie */ | |
1720 | } | |
1721 | ||
82cfbb00 SH |
1722 | static struct leaf *trie_firstleaf(struct trie *t) |
1723 | { | |
1724 | struct tnode *n = (struct tnode *) rcu_dereference(t->trie); | |
1725 | ||
1726 | if (!n) | |
1727 | return NULL; | |
1728 | ||
1729 | if (IS_LEAF(n)) /* trie is just a leaf */ | |
1730 | return (struct leaf *) n; | |
1731 | ||
1732 | return leaf_walk_rcu(n, NULL); | |
1733 | } | |
1734 | ||
1735 | static struct leaf *trie_nextleaf(struct leaf *l) | |
1736 | { | |
1737 | struct node *c = (struct node *) l; | |
1738 | struct tnode *p = node_parent(c); | |
1739 | ||
1740 | if (!p) | |
1741 | return NULL; /* trie with just one leaf */ | |
1742 | ||
1743 | return leaf_walk_rcu(p, c); | |
19baf839 RO |
1744 | } |
1745 | ||
d562f1f8 RO |
1746 | /* |
1747 | * Caller must hold RTNL. | |
1748 | */ | |
19baf839 RO |
1749 | static int fn_trie_flush(struct fib_table *tb) |
1750 | { | |
1751 | struct trie *t = (struct trie *) tb->tb_data; | |
9195bef7 | 1752 | struct leaf *l, *ll = NULL; |
82cfbb00 | 1753 | int found = 0; |
19baf839 | 1754 | |
82cfbb00 | 1755 | for (l = trie_firstleaf(t); l; l = trie_nextleaf(l)) { |
19baf839 RO |
1756 | found += trie_flush_leaf(t, l); |
1757 | ||
1758 | if (ll && hlist_empty(&ll->list)) | |
9195bef7 | 1759 | trie_leaf_remove(t, ll); |
19baf839 RO |
1760 | ll = l; |
1761 | } | |
1762 | ||
1763 | if (ll && hlist_empty(&ll->list)) | |
9195bef7 | 1764 | trie_leaf_remove(t, ll); |
19baf839 | 1765 | |
0c7770c7 | 1766 | pr_debug("trie_flush found=%d\n", found); |
19baf839 RO |
1767 | return found; |
1768 | } | |
1769 | ||
a07f5f50 SH |
1770 | static void fn_trie_select_default(struct fib_table *tb, |
1771 | const struct flowi *flp, | |
1772 | struct fib_result *res) | |
19baf839 RO |
1773 | { |
1774 | struct trie *t = (struct trie *) tb->tb_data; | |
1775 | int order, last_idx; | |
1776 | struct fib_info *fi = NULL; | |
1777 | struct fib_info *last_resort; | |
1778 | struct fib_alias *fa = NULL; | |
1779 | struct list_head *fa_head; | |
1780 | struct leaf *l; | |
1781 | ||
1782 | last_idx = -1; | |
1783 | last_resort = NULL; | |
1784 | order = -1; | |
1785 | ||
2373ce1c | 1786 | rcu_read_lock(); |
c877efb2 | 1787 | |
19baf839 | 1788 | l = fib_find_node(t, 0); |
c877efb2 | 1789 | if (!l) |
19baf839 RO |
1790 | goto out; |
1791 | ||
1792 | fa_head = get_fa_head(l, 0); | |
c877efb2 | 1793 | if (!fa_head) |
19baf839 RO |
1794 | goto out; |
1795 | ||
c877efb2 | 1796 | if (list_empty(fa_head)) |
19baf839 RO |
1797 | goto out; |
1798 | ||
2373ce1c | 1799 | list_for_each_entry_rcu(fa, fa_head, fa_list) { |
19baf839 | 1800 | struct fib_info *next_fi = fa->fa_info; |
91b9a277 | 1801 | |
19baf839 RO |
1802 | if (fa->fa_scope != res->scope || |
1803 | fa->fa_type != RTN_UNICAST) | |
1804 | continue; | |
91b9a277 | 1805 | |
19baf839 RO |
1806 | if (next_fi->fib_priority > res->fi->fib_priority) |
1807 | break; | |
1808 | if (!next_fi->fib_nh[0].nh_gw || | |
1809 | next_fi->fib_nh[0].nh_scope != RT_SCOPE_LINK) | |
1810 | continue; | |
1811 | fa->fa_state |= FA_S_ACCESSED; | |
91b9a277 | 1812 | |
19baf839 RO |
1813 | if (fi == NULL) { |
1814 | if (next_fi != res->fi) | |
1815 | break; | |
1816 | } else if (!fib_detect_death(fi, order, &last_resort, | |
971b893e | 1817 | &last_idx, tb->tb_default)) { |
a2bbe682 | 1818 | fib_result_assign(res, fi); |
971b893e | 1819 | tb->tb_default = order; |
19baf839 RO |
1820 | goto out; |
1821 | } | |
1822 | fi = next_fi; | |
1823 | order++; | |
1824 | } | |
1825 | if (order <= 0 || fi == NULL) { | |
971b893e | 1826 | tb->tb_default = -1; |
19baf839 RO |
1827 | goto out; |
1828 | } | |
1829 | ||
971b893e DL |
1830 | if (!fib_detect_death(fi, order, &last_resort, &last_idx, |
1831 | tb->tb_default)) { | |
a2bbe682 | 1832 | fib_result_assign(res, fi); |
971b893e | 1833 | tb->tb_default = order; |
19baf839 RO |
1834 | goto out; |
1835 | } | |
a2bbe682 DL |
1836 | if (last_idx >= 0) |
1837 | fib_result_assign(res, last_resort); | |
971b893e DL |
1838 | tb->tb_default = last_idx; |
1839 | out: | |
2373ce1c | 1840 | rcu_read_unlock(); |
19baf839 RO |
1841 | } |
1842 | ||
a07f5f50 SH |
1843 | static int fn_trie_dump_fa(t_key key, int plen, struct list_head *fah, |
1844 | struct fib_table *tb, | |
19baf839 RO |
1845 | struct sk_buff *skb, struct netlink_callback *cb) |
1846 | { | |
1847 | int i, s_i; | |
1848 | struct fib_alias *fa; | |
32ab5f80 | 1849 | __be32 xkey = htonl(key); |
19baf839 | 1850 | |
1af5a8c4 | 1851 | s_i = cb->args[4]; |
19baf839 RO |
1852 | i = 0; |
1853 | ||
2373ce1c RO |
1854 | /* rcu_read_lock is hold by caller */ |
1855 | ||
1856 | list_for_each_entry_rcu(fa, fah, fa_list) { | |
19baf839 RO |
1857 | if (i < s_i) { |
1858 | i++; | |
1859 | continue; | |
1860 | } | |
19baf839 RO |
1861 | |
1862 | if (fib_dump_info(skb, NETLINK_CB(cb->skb).pid, | |
1863 | cb->nlh->nlmsg_seq, | |
1864 | RTM_NEWROUTE, | |
1865 | tb->tb_id, | |
1866 | fa->fa_type, | |
1867 | fa->fa_scope, | |
be403ea1 | 1868 | xkey, |
19baf839 RO |
1869 | plen, |
1870 | fa->fa_tos, | |
64347f78 | 1871 | fa->fa_info, NLM_F_MULTI) < 0) { |
1af5a8c4 | 1872 | cb->args[4] = i; |
19baf839 | 1873 | return -1; |
91b9a277 | 1874 | } |
19baf839 RO |
1875 | i++; |
1876 | } | |
1af5a8c4 | 1877 | cb->args[4] = i; |
19baf839 RO |
1878 | return skb->len; |
1879 | } | |
1880 | ||
a88ee229 SH |
1881 | static int fn_trie_dump_leaf(struct leaf *l, struct fib_table *tb, |
1882 | struct sk_buff *skb, struct netlink_callback *cb) | |
19baf839 | 1883 | { |
a88ee229 SH |
1884 | struct leaf_info *li; |
1885 | struct hlist_node *node; | |
1886 | int i, s_i; | |
19baf839 | 1887 | |
a88ee229 SH |
1888 | s_i = cb->args[3]; |
1889 | i = 0; | |
19baf839 | 1890 | |
a88ee229 SH |
1891 | /* rcu_read_lock is hold by caller */ |
1892 | hlist_for_each_entry_rcu(li, node, &l->list, hlist) { | |
1893 | if (i < s_i) { | |
1894 | i++; | |
19baf839 | 1895 | continue; |
a88ee229 | 1896 | } |
91b9a277 | 1897 | |
a88ee229 SH |
1898 | if (i > s_i) |
1899 | cb->args[4] = 0; | |
19baf839 | 1900 | |
a88ee229 | 1901 | if (list_empty(&li->falh)) |
19baf839 RO |
1902 | continue; |
1903 | ||
a88ee229 SH |
1904 | if (fn_trie_dump_fa(l->key, li->plen, &li->falh, tb, skb, cb) < 0) { |
1905 | cb->args[3] = i; | |
19baf839 RO |
1906 | return -1; |
1907 | } | |
a88ee229 | 1908 | i++; |
19baf839 | 1909 | } |
a88ee229 SH |
1910 | |
1911 | cb->args[3] = i; | |
19baf839 RO |
1912 | return skb->len; |
1913 | } | |
1914 | ||
a07f5f50 SH |
1915 | static int fn_trie_dump(struct fib_table *tb, struct sk_buff *skb, |
1916 | struct netlink_callback *cb) | |
19baf839 | 1917 | { |
a88ee229 | 1918 | struct leaf *l; |
19baf839 | 1919 | struct trie *t = (struct trie *) tb->tb_data; |
d5ce8a0e | 1920 | t_key key = cb->args[2]; |
19baf839 | 1921 | |
2373ce1c | 1922 | rcu_read_lock(); |
d5ce8a0e SH |
1923 | /* Dump starting at last key. |
1924 | * Note: 0.0.0.0/0 (ie default) is first key. | |
1925 | */ | |
1926 | if (!key) | |
1927 | l = trie_firstleaf(t); | |
1928 | else { | |
1929 | l = fib_find_node(t, key); | |
1930 | if (!l) { | |
1931 | /* The table changed during the dump, rather than | |
1932 | * giving partial data, just make application retry. | |
1933 | */ | |
1934 | rcu_read_unlock(); | |
1935 | return -EBUSY; | |
a88ee229 | 1936 | } |
d5ce8a0e | 1937 | } |
a88ee229 | 1938 | |
d5ce8a0e SH |
1939 | while (l) { |
1940 | cb->args[2] = l->key; | |
a88ee229 SH |
1941 | if (fn_trie_dump_leaf(l, tb, skb, cb) < 0) { |
1942 | rcu_read_unlock(); | |
a88ee229 | 1943 | return -1; |
19baf839 | 1944 | } |
d5ce8a0e SH |
1945 | |
1946 | l = trie_nextleaf(l); | |
1947 | memset(&cb->args[3], 0, | |
1948 | sizeof(cb->args) - 3*sizeof(cb->args[0])); | |
19baf839 | 1949 | } |
2373ce1c | 1950 | rcu_read_unlock(); |
a88ee229 | 1951 | |
19baf839 | 1952 | return skb->len; |
19baf839 RO |
1953 | } |
1954 | ||
7f9b8052 SH |
1955 | void __init fib_hash_init(void) |
1956 | { | |
a07f5f50 SH |
1957 | fn_alias_kmem = kmem_cache_create("ip_fib_alias", |
1958 | sizeof(struct fib_alias), | |
bc3c8c1e SH |
1959 | 0, SLAB_PANIC, NULL); |
1960 | ||
1961 | trie_leaf_kmem = kmem_cache_create("ip_fib_trie", | |
1962 | max(sizeof(struct leaf), | |
1963 | sizeof(struct leaf_info)), | |
1964 | 0, SLAB_PANIC, NULL); | |
7f9b8052 | 1965 | } |
19baf839 | 1966 | |
7f9b8052 SH |
1967 | |
1968 | /* Fix more generic FIB names for init later */ | |
1969 | struct fib_table *fib_hash_table(u32 id) | |
19baf839 RO |
1970 | { |
1971 | struct fib_table *tb; | |
1972 | struct trie *t; | |
1973 | ||
19baf839 RO |
1974 | tb = kmalloc(sizeof(struct fib_table) + sizeof(struct trie), |
1975 | GFP_KERNEL); | |
1976 | if (tb == NULL) | |
1977 | return NULL; | |
1978 | ||
1979 | tb->tb_id = id; | |
971b893e | 1980 | tb->tb_default = -1; |
19baf839 RO |
1981 | tb->tb_lookup = fn_trie_lookup; |
1982 | tb->tb_insert = fn_trie_insert; | |
1983 | tb->tb_delete = fn_trie_delete; | |
1984 | tb->tb_flush = fn_trie_flush; | |
1985 | tb->tb_select_default = fn_trie_select_default; | |
1986 | tb->tb_dump = fn_trie_dump; | |
19baf839 RO |
1987 | |
1988 | t = (struct trie *) tb->tb_data; | |
c28a1cf4 | 1989 | memset(t, 0, sizeof(*t)); |
19baf839 | 1990 | |
19baf839 | 1991 | if (id == RT_TABLE_LOCAL) |
a07f5f50 | 1992 | pr_info("IPv4 FIB: Using LC-trie version %s\n", VERSION); |
19baf839 RO |
1993 | |
1994 | return tb; | |
1995 | } | |
1996 | ||
cb7b593c SH |
1997 | #ifdef CONFIG_PROC_FS |
1998 | /* Depth first Trie walk iterator */ | |
1999 | struct fib_trie_iter { | |
1c340b2f | 2000 | struct seq_net_private p; |
877a9bff | 2001 | struct trie *trie_local, *trie_main; |
cb7b593c SH |
2002 | struct tnode *tnode; |
2003 | struct trie *trie; | |
2004 | unsigned index; | |
2005 | unsigned depth; | |
2006 | }; | |
19baf839 | 2007 | |
cb7b593c | 2008 | static struct node *fib_trie_get_next(struct fib_trie_iter *iter) |
19baf839 | 2009 | { |
cb7b593c SH |
2010 | struct tnode *tn = iter->tnode; |
2011 | unsigned cindex = iter->index; | |
2012 | struct tnode *p; | |
19baf839 | 2013 | |
6640e697 EB |
2014 | /* A single entry routing table */ |
2015 | if (!tn) | |
2016 | return NULL; | |
2017 | ||
cb7b593c SH |
2018 | pr_debug("get_next iter={node=%p index=%d depth=%d}\n", |
2019 | iter->tnode, iter->index, iter->depth); | |
2020 | rescan: | |
2021 | while (cindex < (1<<tn->bits)) { | |
b59cfbf7 | 2022 | struct node *n = tnode_get_child_rcu(tn, cindex); |
19baf839 | 2023 | |
cb7b593c SH |
2024 | if (n) { |
2025 | if (IS_LEAF(n)) { | |
2026 | iter->tnode = tn; | |
2027 | iter->index = cindex + 1; | |
2028 | } else { | |
2029 | /* push down one level */ | |
2030 | iter->tnode = (struct tnode *) n; | |
2031 | iter->index = 0; | |
2032 | ++iter->depth; | |
2033 | } | |
2034 | return n; | |
2035 | } | |
19baf839 | 2036 | |
cb7b593c SH |
2037 | ++cindex; |
2038 | } | |
91b9a277 | 2039 | |
cb7b593c | 2040 | /* Current node exhausted, pop back up */ |
b59cfbf7 | 2041 | p = node_parent_rcu((struct node *)tn); |
cb7b593c SH |
2042 | if (p) { |
2043 | cindex = tkey_extract_bits(tn->key, p->pos, p->bits)+1; | |
2044 | tn = p; | |
2045 | --iter->depth; | |
2046 | goto rescan; | |
19baf839 | 2047 | } |
cb7b593c SH |
2048 | |
2049 | /* got root? */ | |
2050 | return NULL; | |
19baf839 RO |
2051 | } |
2052 | ||
cb7b593c SH |
2053 | static struct node *fib_trie_get_first(struct fib_trie_iter *iter, |
2054 | struct trie *t) | |
19baf839 | 2055 | { |
5ddf0eb2 RO |
2056 | struct node *n ; |
2057 | ||
132adf54 | 2058 | if (!t) |
5ddf0eb2 RO |
2059 | return NULL; |
2060 | ||
2061 | n = rcu_dereference(t->trie); | |
2062 | ||
132adf54 | 2063 | if (!iter) |
5ddf0eb2 | 2064 | return NULL; |
19baf839 | 2065 | |
6640e697 EB |
2066 | if (n) { |
2067 | if (IS_TNODE(n)) { | |
2068 | iter->tnode = (struct tnode *) n; | |
2069 | iter->trie = t; | |
2070 | iter->index = 0; | |
2071 | iter->depth = 1; | |
2072 | } else { | |
2073 | iter->tnode = NULL; | |
2074 | iter->trie = t; | |
2075 | iter->index = 0; | |
2076 | iter->depth = 0; | |
2077 | } | |
cb7b593c | 2078 | return n; |
91b9a277 | 2079 | } |
cb7b593c SH |
2080 | return NULL; |
2081 | } | |
91b9a277 | 2082 | |
cb7b593c SH |
2083 | static void trie_collect_stats(struct trie *t, struct trie_stat *s) |
2084 | { | |
2085 | struct node *n; | |
2086 | struct fib_trie_iter iter; | |
91b9a277 | 2087 | |
cb7b593c | 2088 | memset(s, 0, sizeof(*s)); |
91b9a277 | 2089 | |
cb7b593c SH |
2090 | rcu_read_lock(); |
2091 | for (n = fib_trie_get_first(&iter, t); n; | |
2092 | n = fib_trie_get_next(&iter)) { | |
2093 | if (IS_LEAF(n)) { | |
93672292 SH |
2094 | struct leaf *l = (struct leaf *)n; |
2095 | struct leaf_info *li; | |
2096 | struct hlist_node *tmp; | |
2097 | ||
cb7b593c SH |
2098 | s->leaves++; |
2099 | s->totdepth += iter.depth; | |
2100 | if (iter.depth > s->maxdepth) | |
2101 | s->maxdepth = iter.depth; | |
93672292 SH |
2102 | |
2103 | hlist_for_each_entry_rcu(li, tmp, &l->list, hlist) | |
2104 | ++s->prefixes; | |
cb7b593c SH |
2105 | } else { |
2106 | const struct tnode *tn = (const struct tnode *) n; | |
2107 | int i; | |
2108 | ||
2109 | s->tnodes++; | |
132adf54 | 2110 | if (tn->bits < MAX_STAT_DEPTH) |
06ef921d RO |
2111 | s->nodesizes[tn->bits]++; |
2112 | ||
cb7b593c SH |
2113 | for (i = 0; i < (1<<tn->bits); i++) |
2114 | if (!tn->child[i]) | |
2115 | s->nullpointers++; | |
19baf839 | 2116 | } |
19baf839 | 2117 | } |
2373ce1c | 2118 | rcu_read_unlock(); |
19baf839 RO |
2119 | } |
2120 | ||
cb7b593c SH |
2121 | /* |
2122 | * This outputs /proc/net/fib_triestats | |
2123 | */ | |
2124 | static void trie_show_stats(struct seq_file *seq, struct trie_stat *stat) | |
19baf839 | 2125 | { |
cb7b593c | 2126 | unsigned i, max, pointers, bytes, avdepth; |
c877efb2 | 2127 | |
cb7b593c SH |
2128 | if (stat->leaves) |
2129 | avdepth = stat->totdepth*100 / stat->leaves; | |
2130 | else | |
2131 | avdepth = 0; | |
91b9a277 | 2132 | |
a07f5f50 SH |
2133 | seq_printf(seq, "\tAver depth: %u.%02d\n", |
2134 | avdepth / 100, avdepth % 100); | |
cb7b593c | 2135 | seq_printf(seq, "\tMax depth: %u\n", stat->maxdepth); |
91b9a277 | 2136 | |
cb7b593c | 2137 | seq_printf(seq, "\tLeaves: %u\n", stat->leaves); |
cb7b593c | 2138 | bytes = sizeof(struct leaf) * stat->leaves; |
93672292 SH |
2139 | |
2140 | seq_printf(seq, "\tPrefixes: %u\n", stat->prefixes); | |
2141 | bytes += sizeof(struct leaf_info) * stat->prefixes; | |
2142 | ||
187b5188 | 2143 | seq_printf(seq, "\tInternal nodes: %u\n\t", stat->tnodes); |
cb7b593c | 2144 | bytes += sizeof(struct tnode) * stat->tnodes; |
19baf839 | 2145 | |
06ef921d RO |
2146 | max = MAX_STAT_DEPTH; |
2147 | while (max > 0 && stat->nodesizes[max-1] == 0) | |
cb7b593c | 2148 | max--; |
19baf839 | 2149 | |
cb7b593c SH |
2150 | pointers = 0; |
2151 | for (i = 1; i <= max; i++) | |
2152 | if (stat->nodesizes[i] != 0) { | |
187b5188 | 2153 | seq_printf(seq, " %u: %u", i, stat->nodesizes[i]); |
cb7b593c SH |
2154 | pointers += (1<<i) * stat->nodesizes[i]; |
2155 | } | |
2156 | seq_putc(seq, '\n'); | |
187b5188 | 2157 | seq_printf(seq, "\tPointers: %u\n", pointers); |
2373ce1c | 2158 | |
cb7b593c | 2159 | bytes += sizeof(struct node *) * pointers; |
187b5188 SH |
2160 | seq_printf(seq, "Null ptrs: %u\n", stat->nullpointers); |
2161 | seq_printf(seq, "Total size: %u kB\n", (bytes + 1023) / 1024); | |
66a2f7fd | 2162 | } |
2373ce1c | 2163 | |
cb7b593c | 2164 | #ifdef CONFIG_IP_FIB_TRIE_STATS |
66a2f7fd SH |
2165 | static void trie_show_usage(struct seq_file *seq, |
2166 | const struct trie_use_stats *stats) | |
2167 | { | |
2168 | seq_printf(seq, "\nCounters:\n---------\n"); | |
a07f5f50 SH |
2169 | seq_printf(seq, "gets = %u\n", stats->gets); |
2170 | seq_printf(seq, "backtracks = %u\n", stats->backtrack); | |
2171 | seq_printf(seq, "semantic match passed = %u\n", | |
2172 | stats->semantic_match_passed); | |
2173 | seq_printf(seq, "semantic match miss = %u\n", | |
2174 | stats->semantic_match_miss); | |
2175 | seq_printf(seq, "null node hit= %u\n", stats->null_node_hit); | |
2176 | seq_printf(seq, "skipped node resize = %u\n\n", | |
2177 | stats->resize_node_skipped); | |
cb7b593c | 2178 | } |
66a2f7fd SH |
2179 | #endif /* CONFIG_IP_FIB_TRIE_STATS */ |
2180 | ||
a07f5f50 SH |
2181 | static void fib_trie_show(struct seq_file *seq, const char *name, |
2182 | struct trie *trie) | |
d717a9a6 SH |
2183 | { |
2184 | struct trie_stat stat; | |
2185 | ||
d717a9a6 | 2186 | trie_collect_stats(trie, &stat); |
93672292 | 2187 | seq_printf(seq, "%s:\n", name); |
d717a9a6 SH |
2188 | trie_show_stats(seq, &stat); |
2189 | #ifdef CONFIG_IP_FIB_TRIE_STATS | |
2190 | trie_show_usage(seq, &trie->stats); | |
2191 | #endif | |
2192 | } | |
19baf839 | 2193 | |
cb7b593c SH |
2194 | static int fib_triestat_seq_show(struct seq_file *seq, void *v) |
2195 | { | |
1c340b2f | 2196 | struct net *net = (struct net *)seq->private; |
877a9bff EB |
2197 | struct fib_table *tb; |
2198 | ||
d717a9a6 | 2199 | seq_printf(seq, |
a07f5f50 SH |
2200 | "Basic info: size of leaf:" |
2201 | " %Zd bytes, size of tnode: %Zd bytes.\n", | |
d717a9a6 SH |
2202 | sizeof(struct leaf), sizeof(struct tnode)); |
2203 | ||
1c340b2f | 2204 | tb = fib_get_table(net, RT_TABLE_LOCAL); |
877a9bff | 2205 | if (tb) |
d717a9a6 | 2206 | fib_trie_show(seq, "Local", (struct trie *) tb->tb_data); |
877a9bff | 2207 | |
1c340b2f | 2208 | tb = fib_get_table(net, RT_TABLE_MAIN); |
877a9bff | 2209 | if (tb) |
d717a9a6 | 2210 | fib_trie_show(seq, "Main", (struct trie *) tb->tb_data); |
19baf839 | 2211 | |
cb7b593c | 2212 | return 0; |
19baf839 RO |
2213 | } |
2214 | ||
cb7b593c | 2215 | static int fib_triestat_seq_open(struct inode *inode, struct file *file) |
19baf839 | 2216 | { |
1c340b2f DL |
2217 | int err; |
2218 | struct net *net; | |
2219 | ||
2220 | net = get_proc_net(inode); | |
2221 | if (net == NULL) | |
2222 | return -ENXIO; | |
2223 | err = single_open(file, fib_triestat_seq_show, net); | |
2224 | if (err < 0) { | |
2225 | put_net(net); | |
2226 | return err; | |
2227 | } | |
2228 | return 0; | |
2229 | } | |
2230 | ||
2231 | static int fib_triestat_seq_release(struct inode *ino, struct file *f) | |
2232 | { | |
2233 | struct seq_file *seq = f->private_data; | |
2234 | put_net(seq->private); | |
2235 | return single_release(ino, f); | |
19baf839 RO |
2236 | } |
2237 | ||
9a32144e | 2238 | static const struct file_operations fib_triestat_fops = { |
cb7b593c SH |
2239 | .owner = THIS_MODULE, |
2240 | .open = fib_triestat_seq_open, | |
2241 | .read = seq_read, | |
2242 | .llseek = seq_lseek, | |
1c340b2f | 2243 | .release = fib_triestat_seq_release, |
cb7b593c SH |
2244 | }; |
2245 | ||
2246 | static struct node *fib_trie_get_idx(struct fib_trie_iter *iter, | |
2247 | loff_t pos) | |
19baf839 | 2248 | { |
cb7b593c SH |
2249 | loff_t idx = 0; |
2250 | struct node *n; | |
2251 | ||
877a9bff | 2252 | for (n = fib_trie_get_first(iter, iter->trie_local); |
cb7b593c SH |
2253 | n; ++idx, n = fib_trie_get_next(iter)) { |
2254 | if (pos == idx) | |
2255 | return n; | |
2256 | } | |
2257 | ||
877a9bff | 2258 | for (n = fib_trie_get_first(iter, iter->trie_main); |
cb7b593c SH |
2259 | n; ++idx, n = fib_trie_get_next(iter)) { |
2260 | if (pos == idx) | |
2261 | return n; | |
2262 | } | |
19baf839 RO |
2263 | return NULL; |
2264 | } | |
2265 | ||
cb7b593c | 2266 | static void *fib_trie_seq_start(struct seq_file *seq, loff_t *pos) |
c95aaf9a | 2267 | __acquires(RCU) |
19baf839 | 2268 | { |
877a9bff EB |
2269 | struct fib_trie_iter *iter = seq->private; |
2270 | struct fib_table *tb; | |
2271 | ||
2272 | if (!iter->trie_local) { | |
1c340b2f | 2273 | tb = fib_get_table(iter->p.net, RT_TABLE_LOCAL); |
877a9bff EB |
2274 | if (tb) |
2275 | iter->trie_local = (struct trie *) tb->tb_data; | |
2276 | } | |
2277 | if (!iter->trie_main) { | |
1c340b2f | 2278 | tb = fib_get_table(iter->p.net, RT_TABLE_MAIN); |
877a9bff EB |
2279 | if (tb) |
2280 | iter->trie_main = (struct trie *) tb->tb_data; | |
2281 | } | |
cb7b593c SH |
2282 | rcu_read_lock(); |
2283 | if (*pos == 0) | |
91b9a277 | 2284 | return SEQ_START_TOKEN; |
877a9bff | 2285 | return fib_trie_get_idx(iter, *pos - 1); |
19baf839 RO |
2286 | } |
2287 | ||
cb7b593c | 2288 | static void *fib_trie_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
19baf839 | 2289 | { |
cb7b593c SH |
2290 | struct fib_trie_iter *iter = seq->private; |
2291 | void *l = v; | |
2292 | ||
19baf839 | 2293 | ++*pos; |
91b9a277 | 2294 | if (v == SEQ_START_TOKEN) |
cb7b593c | 2295 | return fib_trie_get_idx(iter, 0); |
19baf839 | 2296 | |
cb7b593c SH |
2297 | v = fib_trie_get_next(iter); |
2298 | BUG_ON(v == l); | |
2299 | if (v) | |
2300 | return v; | |
19baf839 | 2301 | |
cb7b593c | 2302 | /* continue scan in next trie */ |
877a9bff EB |
2303 | if (iter->trie == iter->trie_local) |
2304 | return fib_trie_get_first(iter, iter->trie_main); | |
19baf839 | 2305 | |
cb7b593c SH |
2306 | return NULL; |
2307 | } | |
19baf839 | 2308 | |
cb7b593c | 2309 | static void fib_trie_seq_stop(struct seq_file *seq, void *v) |
c95aaf9a | 2310 | __releases(RCU) |
19baf839 | 2311 | { |
cb7b593c SH |
2312 | rcu_read_unlock(); |
2313 | } | |
91b9a277 | 2314 | |
cb7b593c SH |
2315 | static void seq_indent(struct seq_file *seq, int n) |
2316 | { | |
2317 | while (n-- > 0) seq_puts(seq, " "); | |
2318 | } | |
19baf839 | 2319 | |
28d36e37 | 2320 | static inline const char *rtn_scope(char *buf, size_t len, enum rt_scope_t s) |
cb7b593c | 2321 | { |
132adf54 | 2322 | switch (s) { |
cb7b593c SH |
2323 | case RT_SCOPE_UNIVERSE: return "universe"; |
2324 | case RT_SCOPE_SITE: return "site"; | |
2325 | case RT_SCOPE_LINK: return "link"; | |
2326 | case RT_SCOPE_HOST: return "host"; | |
2327 | case RT_SCOPE_NOWHERE: return "nowhere"; | |
2328 | default: | |
28d36e37 | 2329 | snprintf(buf, len, "scope=%d", s); |
cb7b593c SH |
2330 | return buf; |
2331 | } | |
2332 | } | |
19baf839 | 2333 | |
cb7b593c SH |
2334 | static const char *rtn_type_names[__RTN_MAX] = { |
2335 | [RTN_UNSPEC] = "UNSPEC", | |
2336 | [RTN_UNICAST] = "UNICAST", | |
2337 | [RTN_LOCAL] = "LOCAL", | |
2338 | [RTN_BROADCAST] = "BROADCAST", | |
2339 | [RTN_ANYCAST] = "ANYCAST", | |
2340 | [RTN_MULTICAST] = "MULTICAST", | |
2341 | [RTN_BLACKHOLE] = "BLACKHOLE", | |
2342 | [RTN_UNREACHABLE] = "UNREACHABLE", | |
2343 | [RTN_PROHIBIT] = "PROHIBIT", | |
2344 | [RTN_THROW] = "THROW", | |
2345 | [RTN_NAT] = "NAT", | |
2346 | [RTN_XRESOLVE] = "XRESOLVE", | |
2347 | }; | |
19baf839 | 2348 | |
28d36e37 | 2349 | static inline const char *rtn_type(char *buf, size_t len, unsigned t) |
cb7b593c | 2350 | { |
cb7b593c SH |
2351 | if (t < __RTN_MAX && rtn_type_names[t]) |
2352 | return rtn_type_names[t]; | |
28d36e37 | 2353 | snprintf(buf, len, "type %u", t); |
cb7b593c | 2354 | return buf; |
19baf839 RO |
2355 | } |
2356 | ||
cb7b593c SH |
2357 | /* Pretty print the trie */ |
2358 | static int fib_trie_seq_show(struct seq_file *seq, void *v) | |
19baf839 | 2359 | { |
cb7b593c SH |
2360 | const struct fib_trie_iter *iter = seq->private; |
2361 | struct node *n = v; | |
c877efb2 | 2362 | |
cb7b593c SH |
2363 | if (v == SEQ_START_TOKEN) |
2364 | return 0; | |
19baf839 | 2365 | |
b59cfbf7 | 2366 | if (!node_parent_rcu(n)) { |
877a9bff | 2367 | if (iter->trie == iter->trie_local) |
095b8501 RO |
2368 | seq_puts(seq, "<local>:\n"); |
2369 | else | |
2370 | seq_puts(seq, "<main>:\n"); | |
2371 | } | |
2372 | ||
cb7b593c SH |
2373 | if (IS_TNODE(n)) { |
2374 | struct tnode *tn = (struct tnode *) n; | |
ab66b4a7 | 2375 | __be32 prf = htonl(mask_pfx(tn->key, tn->pos)); |
91b9a277 | 2376 | |
1d25cd6c RO |
2377 | seq_indent(seq, iter->depth-1); |
2378 | seq_printf(seq, " +-- %d.%d.%d.%d/%d %d %d %d\n", | |
e905a9ed | 2379 | NIPQUAD(prf), tn->pos, tn->bits, tn->full_children, |
1d25cd6c | 2380 | tn->empty_children); |
e905a9ed | 2381 | |
cb7b593c SH |
2382 | } else { |
2383 | struct leaf *l = (struct leaf *) n; | |
1328042e SH |
2384 | struct leaf_info *li; |
2385 | struct hlist_node *node; | |
32ab5f80 | 2386 | __be32 val = htonl(l->key); |
cb7b593c SH |
2387 | |
2388 | seq_indent(seq, iter->depth); | |
2389 | seq_printf(seq, " |-- %d.%d.%d.%d\n", NIPQUAD(val)); | |
1328042e SH |
2390 | |
2391 | hlist_for_each_entry_rcu(li, node, &l->list, hlist) { | |
2392 | struct fib_alias *fa; | |
2393 | ||
2394 | list_for_each_entry_rcu(fa, &li->falh, fa_list) { | |
2395 | char buf1[32], buf2[32]; | |
2396 | ||
2397 | seq_indent(seq, iter->depth+1); | |
2398 | seq_printf(seq, " /%d %s %s", li->plen, | |
2399 | rtn_scope(buf1, sizeof(buf1), | |
2400 | fa->fa_scope), | |
2401 | rtn_type(buf2, sizeof(buf2), | |
2402 | fa->fa_type)); | |
2403 | if (fa->fa_tos) | |
2404 | seq_printf(seq, "tos =%d\n", | |
2405 | fa->fa_tos); | |
2406 | seq_putc(seq, '\n'); | |
cb7b593c SH |
2407 | } |
2408 | } | |
19baf839 | 2409 | } |
cb7b593c | 2410 | |
19baf839 RO |
2411 | return 0; |
2412 | } | |
2413 | ||
f690808e | 2414 | static const struct seq_operations fib_trie_seq_ops = { |
cb7b593c SH |
2415 | .start = fib_trie_seq_start, |
2416 | .next = fib_trie_seq_next, | |
2417 | .stop = fib_trie_seq_stop, | |
2418 | .show = fib_trie_seq_show, | |
19baf839 RO |
2419 | }; |
2420 | ||
cb7b593c | 2421 | static int fib_trie_seq_open(struct inode *inode, struct file *file) |
19baf839 | 2422 | { |
1c340b2f DL |
2423 | return seq_open_net(inode, file, &fib_trie_seq_ops, |
2424 | sizeof(struct fib_trie_iter)); | |
19baf839 RO |
2425 | } |
2426 | ||
9a32144e | 2427 | static const struct file_operations fib_trie_fops = { |
cb7b593c SH |
2428 | .owner = THIS_MODULE, |
2429 | .open = fib_trie_seq_open, | |
2430 | .read = seq_read, | |
2431 | .llseek = seq_lseek, | |
1c340b2f | 2432 | .release = seq_release_net, |
19baf839 RO |
2433 | }; |
2434 | ||
32ab5f80 | 2435 | static unsigned fib_flag_trans(int type, __be32 mask, const struct fib_info *fi) |
19baf839 | 2436 | { |
cb7b593c SH |
2437 | static unsigned type2flags[RTN_MAX + 1] = { |
2438 | [7] = RTF_REJECT, [8] = RTF_REJECT, | |
2439 | }; | |
2440 | unsigned flags = type2flags[type]; | |
19baf839 | 2441 | |
cb7b593c SH |
2442 | if (fi && fi->fib_nh->nh_gw) |
2443 | flags |= RTF_GATEWAY; | |
32ab5f80 | 2444 | if (mask == htonl(0xFFFFFFFF)) |
cb7b593c SH |
2445 | flags |= RTF_HOST; |
2446 | flags |= RTF_UP; | |
2447 | return flags; | |
19baf839 RO |
2448 | } |
2449 | ||
cb7b593c SH |
2450 | /* |
2451 | * This outputs /proc/net/route. | |
2452 | * The format of the file is not supposed to be changed | |
2453 | * and needs to be same as fib_hash output to avoid breaking | |
2454 | * legacy utilities | |
2455 | */ | |
2456 | static int fib_route_seq_show(struct seq_file *seq, void *v) | |
19baf839 | 2457 | { |
c9e53cbe | 2458 | const struct fib_trie_iter *iter = seq->private; |
cb7b593c | 2459 | struct leaf *l = v; |
1328042e SH |
2460 | struct leaf_info *li; |
2461 | struct hlist_node *node; | |
19baf839 | 2462 | |
cb7b593c SH |
2463 | if (v == SEQ_START_TOKEN) { |
2464 | seq_printf(seq, "%-127s\n", "Iface\tDestination\tGateway " | |
2465 | "\tFlags\tRefCnt\tUse\tMetric\tMask\t\tMTU" | |
2466 | "\tWindow\tIRTT"); | |
2467 | return 0; | |
2468 | } | |
19baf839 | 2469 | |
877a9bff | 2470 | if (iter->trie == iter->trie_local) |
c9e53cbe | 2471 | return 0; |
a07f5f50 | 2472 | |
cb7b593c SH |
2473 | if (IS_TNODE(l)) |
2474 | return 0; | |
19baf839 | 2475 | |
1328042e | 2476 | hlist_for_each_entry_rcu(li, node, &l->list, hlist) { |
cb7b593c | 2477 | struct fib_alias *fa; |
32ab5f80 | 2478 | __be32 mask, prefix; |
91b9a277 | 2479 | |
cb7b593c SH |
2480 | mask = inet_make_mask(li->plen); |
2481 | prefix = htonl(l->key); | |
19baf839 | 2482 | |
cb7b593c | 2483 | list_for_each_entry_rcu(fa, &li->falh, fa_list) { |
1371e37d | 2484 | const struct fib_info *fi = fa->fa_info; |
cb7b593c | 2485 | unsigned flags = fib_flag_trans(fa->fa_type, mask, fi); |
1328042e | 2486 | char bf[128]; |
19baf839 | 2487 | |
cb7b593c SH |
2488 | if (fa->fa_type == RTN_BROADCAST |
2489 | || fa->fa_type == RTN_MULTICAST) | |
2490 | continue; | |
19baf839 | 2491 | |
cb7b593c SH |
2492 | if (fi) |
2493 | snprintf(bf, sizeof(bf), | |
2494 | "%s\t%08X\t%08X\t%04X\t%d\t%u\t%d\t%08X\t%d\t%u\t%u", | |
2495 | fi->fib_dev ? fi->fib_dev->name : "*", | |
2496 | prefix, | |
2497 | fi->fib_nh->nh_gw, flags, 0, 0, | |
2498 | fi->fib_priority, | |
2499 | mask, | |
a07f5f50 SH |
2500 | (fi->fib_advmss ? |
2501 | fi->fib_advmss + 40 : 0), | |
cb7b593c SH |
2502 | fi->fib_window, |
2503 | fi->fib_rtt >> 3); | |
2504 | else | |
2505 | snprintf(bf, sizeof(bf), | |
2506 | "*\t%08X\t%08X\t%04X\t%d\t%u\t%d\t%08X\t%d\t%u\t%u", | |
2507 | prefix, 0, flags, 0, 0, 0, | |
2508 | mask, 0, 0, 0); | |
19baf839 | 2509 | |
cb7b593c SH |
2510 | seq_printf(seq, "%-127s\n", bf); |
2511 | } | |
19baf839 RO |
2512 | } |
2513 | ||
2514 | return 0; | |
2515 | } | |
2516 | ||
f690808e | 2517 | static const struct seq_operations fib_route_seq_ops = { |
cb7b593c SH |
2518 | .start = fib_trie_seq_start, |
2519 | .next = fib_trie_seq_next, | |
2520 | .stop = fib_trie_seq_stop, | |
2521 | .show = fib_route_seq_show, | |
19baf839 RO |
2522 | }; |
2523 | ||
cb7b593c | 2524 | static int fib_route_seq_open(struct inode *inode, struct file *file) |
19baf839 | 2525 | { |
1c340b2f DL |
2526 | return seq_open_net(inode, file, &fib_route_seq_ops, |
2527 | sizeof(struct fib_trie_iter)); | |
19baf839 RO |
2528 | } |
2529 | ||
9a32144e | 2530 | static const struct file_operations fib_route_fops = { |
cb7b593c SH |
2531 | .owner = THIS_MODULE, |
2532 | .open = fib_route_seq_open, | |
2533 | .read = seq_read, | |
2534 | .llseek = seq_lseek, | |
1c340b2f | 2535 | .release = seq_release_net, |
19baf839 RO |
2536 | }; |
2537 | ||
61a02653 | 2538 | int __net_init fib_proc_init(struct net *net) |
19baf839 | 2539 | { |
61a02653 | 2540 | if (!proc_net_fops_create(net, "fib_trie", S_IRUGO, &fib_trie_fops)) |
cb7b593c SH |
2541 | goto out1; |
2542 | ||
61a02653 DL |
2543 | if (!proc_net_fops_create(net, "fib_triestat", S_IRUGO, |
2544 | &fib_triestat_fops)) | |
cb7b593c SH |
2545 | goto out2; |
2546 | ||
61a02653 | 2547 | if (!proc_net_fops_create(net, "route", S_IRUGO, &fib_route_fops)) |
cb7b593c SH |
2548 | goto out3; |
2549 | ||
19baf839 | 2550 | return 0; |
cb7b593c SH |
2551 | |
2552 | out3: | |
61a02653 | 2553 | proc_net_remove(net, "fib_triestat"); |
cb7b593c | 2554 | out2: |
61a02653 | 2555 | proc_net_remove(net, "fib_trie"); |
cb7b593c SH |
2556 | out1: |
2557 | return -ENOMEM; | |
19baf839 RO |
2558 | } |
2559 | ||
61a02653 | 2560 | void __net_exit fib_proc_exit(struct net *net) |
19baf839 | 2561 | { |
61a02653 DL |
2562 | proc_net_remove(net, "fib_trie"); |
2563 | proc_net_remove(net, "fib_triestat"); | |
2564 | proc_net_remove(net, "route"); | |
19baf839 RO |
2565 | } |
2566 | ||
2567 | #endif /* CONFIG_PROC_FS */ |