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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 | |
451 | /* update emptyChildren */ | |
452 | if (n == NULL && chi != NULL) | |
453 | tn->empty_children++; | |
454 | else if (n != NULL && chi == NULL) | |
455 | tn->empty_children--; | |
c877efb2 | 456 | |
19baf839 | 457 | /* update fullChildren */ |
91b9a277 | 458 | if (wasfull == -1) |
19baf839 RO |
459 | wasfull = tnode_full(tn, chi); |
460 | ||
461 | isfull = tnode_full(tn, n); | |
c877efb2 | 462 | if (wasfull && !isfull) |
19baf839 | 463 | tn->full_children--; |
c877efb2 | 464 | else if (!wasfull && isfull) |
19baf839 | 465 | tn->full_children++; |
91b9a277 | 466 | |
c877efb2 | 467 | if (n) |
06801916 | 468 | node_set_parent(n, tn); |
19baf839 | 469 | |
2373ce1c | 470 | rcu_assign_pointer(tn->child[i], n); |
19baf839 RO |
471 | } |
472 | ||
c877efb2 | 473 | static struct node *resize(struct trie *t, struct tnode *tn) |
19baf839 RO |
474 | { |
475 | int i; | |
2f36895a | 476 | int err = 0; |
2f80b3c8 | 477 | struct tnode *old_tn; |
e6308be8 RO |
478 | int inflate_threshold_use; |
479 | int halve_threshold_use; | |
05eee48c | 480 | int max_resize; |
19baf839 | 481 | |
e905a9ed | 482 | if (!tn) |
19baf839 RO |
483 | return NULL; |
484 | ||
0c7770c7 SH |
485 | pr_debug("In tnode_resize %p inflate_threshold=%d threshold=%d\n", |
486 | tn, inflate_threshold, halve_threshold); | |
19baf839 RO |
487 | |
488 | /* No children */ | |
489 | if (tn->empty_children == tnode_child_length(tn)) { | |
490 | tnode_free(tn); | |
491 | return NULL; | |
492 | } | |
493 | /* One child */ | |
494 | if (tn->empty_children == tnode_child_length(tn) - 1) | |
495 | for (i = 0; i < tnode_child_length(tn); i++) { | |
91b9a277 | 496 | struct node *n; |
19baf839 | 497 | |
91b9a277 | 498 | n = tn->child[i]; |
2373ce1c | 499 | if (!n) |
91b9a277 | 500 | continue; |
91b9a277 OJ |
501 | |
502 | /* compress one level */ | |
06801916 | 503 | node_set_parent(n, NULL); |
91b9a277 OJ |
504 | tnode_free(tn); |
505 | return n; | |
19baf839 | 506 | } |
c877efb2 | 507 | /* |
19baf839 RO |
508 | * Double as long as the resulting node has a number of |
509 | * nonempty nodes that are above the threshold. | |
510 | */ | |
511 | ||
512 | /* | |
c877efb2 SH |
513 | * From "Implementing a dynamic compressed trie" by Stefan Nilsson of |
514 | * the Helsinki University of Technology and Matti Tikkanen of Nokia | |
19baf839 | 515 | * Telecommunications, page 6: |
c877efb2 | 516 | * "A node is doubled if the ratio of non-empty children to all |
19baf839 RO |
517 | * children in the *doubled* node is at least 'high'." |
518 | * | |
c877efb2 SH |
519 | * 'high' in this instance is the variable 'inflate_threshold'. It |
520 | * is expressed as a percentage, so we multiply it with | |
521 | * tnode_child_length() and instead of multiplying by 2 (since the | |
522 | * child array will be doubled by inflate()) and multiplying | |
523 | * the left-hand side by 100 (to handle the percentage thing) we | |
19baf839 | 524 | * multiply the left-hand side by 50. |
c877efb2 SH |
525 | * |
526 | * The left-hand side may look a bit weird: tnode_child_length(tn) | |
527 | * - tn->empty_children is of course the number of non-null children | |
528 | * in the current node. tn->full_children is the number of "full" | |
19baf839 | 529 | * children, that is non-null tnodes with a skip value of 0. |
c877efb2 | 530 | * All of those will be doubled in the resulting inflated tnode, so |
19baf839 | 531 | * we just count them one extra time here. |
c877efb2 | 532 | * |
19baf839 | 533 | * A clearer way to write this would be: |
c877efb2 | 534 | * |
19baf839 | 535 | * to_be_doubled = tn->full_children; |
c877efb2 | 536 | * not_to_be_doubled = tnode_child_length(tn) - tn->empty_children - |
19baf839 RO |
537 | * tn->full_children; |
538 | * | |
539 | * new_child_length = tnode_child_length(tn) * 2; | |
540 | * | |
c877efb2 | 541 | * new_fill_factor = 100 * (not_to_be_doubled + 2*to_be_doubled) / |
19baf839 RO |
542 | * new_child_length; |
543 | * if (new_fill_factor >= inflate_threshold) | |
c877efb2 SH |
544 | * |
545 | * ...and so on, tho it would mess up the while () loop. | |
546 | * | |
19baf839 RO |
547 | * anyway, |
548 | * 100 * (not_to_be_doubled + 2*to_be_doubled) / new_child_length >= | |
549 | * inflate_threshold | |
c877efb2 | 550 | * |
19baf839 RO |
551 | * avoid a division: |
552 | * 100 * (not_to_be_doubled + 2*to_be_doubled) >= | |
553 | * inflate_threshold * new_child_length | |
c877efb2 | 554 | * |
19baf839 | 555 | * expand not_to_be_doubled and to_be_doubled, and shorten: |
c877efb2 | 556 | * 100 * (tnode_child_length(tn) - tn->empty_children + |
91b9a277 | 557 | * tn->full_children) >= inflate_threshold * new_child_length |
c877efb2 | 558 | * |
19baf839 | 559 | * expand new_child_length: |
c877efb2 | 560 | * 100 * (tnode_child_length(tn) - tn->empty_children + |
91b9a277 | 561 | * tn->full_children) >= |
19baf839 | 562 | * inflate_threshold * tnode_child_length(tn) * 2 |
c877efb2 | 563 | * |
19baf839 | 564 | * shorten again: |
c877efb2 | 565 | * 50 * (tn->full_children + tnode_child_length(tn) - |
91b9a277 | 566 | * tn->empty_children) >= inflate_threshold * |
19baf839 | 567 | * tnode_child_length(tn) |
c877efb2 | 568 | * |
19baf839 RO |
569 | */ |
570 | ||
571 | check_tnode(tn); | |
c877efb2 | 572 | |
e6308be8 RO |
573 | /* Keep root node larger */ |
574 | ||
132adf54 | 575 | if (!tn->parent) |
e6308be8 | 576 | inflate_threshold_use = inflate_threshold_root; |
e905a9ed | 577 | else |
e6308be8 RO |
578 | inflate_threshold_use = inflate_threshold; |
579 | ||
2f36895a | 580 | err = 0; |
05eee48c RO |
581 | max_resize = 10; |
582 | while ((tn->full_children > 0 && max_resize-- && | |
a07f5f50 SH |
583 | 50 * (tn->full_children + tnode_child_length(tn) |
584 | - tn->empty_children) | |
585 | >= inflate_threshold_use * tnode_child_length(tn))) { | |
19baf839 | 586 | |
2f80b3c8 RO |
587 | old_tn = tn; |
588 | tn = inflate(t, tn); | |
a07f5f50 | 589 | |
2f80b3c8 RO |
590 | if (IS_ERR(tn)) { |
591 | tn = old_tn; | |
2f36895a RO |
592 | #ifdef CONFIG_IP_FIB_TRIE_STATS |
593 | t->stats.resize_node_skipped++; | |
594 | #endif | |
595 | break; | |
596 | } | |
19baf839 RO |
597 | } |
598 | ||
05eee48c RO |
599 | if (max_resize < 0) { |
600 | if (!tn->parent) | |
a07f5f50 SH |
601 | pr_warning("Fix inflate_threshold_root." |
602 | " Now=%d size=%d bits\n", | |
603 | inflate_threshold_root, tn->bits); | |
05eee48c | 604 | else |
a07f5f50 SH |
605 | pr_warning("Fix inflate_threshold." |
606 | " Now=%d size=%d bits\n", | |
607 | inflate_threshold, tn->bits); | |
05eee48c RO |
608 | } |
609 | ||
19baf839 RO |
610 | check_tnode(tn); |
611 | ||
612 | /* | |
613 | * Halve as long as the number of empty children in this | |
614 | * node is above threshold. | |
615 | */ | |
2f36895a | 616 | |
e6308be8 RO |
617 | |
618 | /* Keep root node larger */ | |
619 | ||
132adf54 | 620 | if (!tn->parent) |
e6308be8 | 621 | halve_threshold_use = halve_threshold_root; |
e905a9ed | 622 | else |
e6308be8 RO |
623 | halve_threshold_use = halve_threshold; |
624 | ||
2f36895a | 625 | err = 0; |
05eee48c RO |
626 | max_resize = 10; |
627 | while (tn->bits > 1 && max_resize-- && | |
19baf839 | 628 | 100 * (tnode_child_length(tn) - tn->empty_children) < |
e6308be8 | 629 | halve_threshold_use * tnode_child_length(tn)) { |
2f36895a | 630 | |
2f80b3c8 RO |
631 | old_tn = tn; |
632 | tn = halve(t, tn); | |
633 | if (IS_ERR(tn)) { | |
634 | tn = old_tn; | |
2f36895a RO |
635 | #ifdef CONFIG_IP_FIB_TRIE_STATS |
636 | t->stats.resize_node_skipped++; | |
637 | #endif | |
638 | break; | |
639 | } | |
640 | } | |
19baf839 | 641 | |
05eee48c RO |
642 | if (max_resize < 0) { |
643 | if (!tn->parent) | |
a07f5f50 SH |
644 | pr_warning("Fix halve_threshold_root." |
645 | " Now=%d size=%d bits\n", | |
646 | halve_threshold_root, tn->bits); | |
05eee48c | 647 | else |
a07f5f50 SH |
648 | pr_warning("Fix halve_threshold." |
649 | " Now=%d size=%d bits\n", | |
650 | halve_threshold, tn->bits); | |
05eee48c | 651 | } |
c877efb2 | 652 | |
19baf839 | 653 | /* Only one child remains */ |
19baf839 RO |
654 | if (tn->empty_children == tnode_child_length(tn) - 1) |
655 | for (i = 0; i < tnode_child_length(tn); i++) { | |
91b9a277 | 656 | struct node *n; |
19baf839 | 657 | |
91b9a277 | 658 | n = tn->child[i]; |
2373ce1c | 659 | if (!n) |
91b9a277 | 660 | continue; |
91b9a277 OJ |
661 | |
662 | /* compress one level */ | |
663 | ||
06801916 | 664 | node_set_parent(n, NULL); |
91b9a277 OJ |
665 | tnode_free(tn); |
666 | return n; | |
19baf839 RO |
667 | } |
668 | ||
669 | return (struct node *) tn; | |
670 | } | |
671 | ||
2f80b3c8 | 672 | static struct tnode *inflate(struct trie *t, struct tnode *tn) |
19baf839 | 673 | { |
19baf839 RO |
674 | struct tnode *oldtnode = tn; |
675 | int olen = tnode_child_length(tn); | |
676 | int i; | |
677 | ||
0c7770c7 | 678 | pr_debug("In inflate\n"); |
19baf839 RO |
679 | |
680 | tn = tnode_new(oldtnode->key, oldtnode->pos, oldtnode->bits + 1); | |
681 | ||
0c7770c7 | 682 | if (!tn) |
2f80b3c8 | 683 | return ERR_PTR(-ENOMEM); |
2f36895a RO |
684 | |
685 | /* | |
c877efb2 SH |
686 | * Preallocate and store tnodes before the actual work so we |
687 | * don't get into an inconsistent state if memory allocation | |
688 | * fails. In case of failure we return the oldnode and inflate | |
2f36895a RO |
689 | * of tnode is ignored. |
690 | */ | |
91b9a277 OJ |
691 | |
692 | for (i = 0; i < olen; i++) { | |
a07f5f50 | 693 | struct tnode *inode; |
2f36895a | 694 | |
a07f5f50 | 695 | inode = (struct tnode *) tnode_get_child(oldtnode, i); |
2f36895a RO |
696 | if (inode && |
697 | IS_TNODE(inode) && | |
698 | inode->pos == oldtnode->pos + oldtnode->bits && | |
699 | inode->bits > 1) { | |
700 | struct tnode *left, *right; | |
ab66b4a7 | 701 | t_key m = ~0U << (KEYLENGTH - 1) >> inode->pos; |
c877efb2 | 702 | |
2f36895a RO |
703 | left = tnode_new(inode->key&(~m), inode->pos + 1, |
704 | inode->bits - 1); | |
2f80b3c8 RO |
705 | if (!left) |
706 | goto nomem; | |
91b9a277 | 707 | |
2f36895a RO |
708 | right = tnode_new(inode->key|m, inode->pos + 1, |
709 | inode->bits - 1); | |
710 | ||
e905a9ed | 711 | if (!right) { |
2f80b3c8 RO |
712 | tnode_free(left); |
713 | goto nomem; | |
e905a9ed | 714 | } |
2f36895a RO |
715 | |
716 | put_child(t, tn, 2*i, (struct node *) left); | |
717 | put_child(t, tn, 2*i+1, (struct node *) right); | |
718 | } | |
719 | } | |
720 | ||
91b9a277 | 721 | for (i = 0; i < olen; i++) { |
c95aaf9a | 722 | struct tnode *inode; |
19baf839 | 723 | struct node *node = tnode_get_child(oldtnode, i); |
91b9a277 OJ |
724 | struct tnode *left, *right; |
725 | int size, j; | |
c877efb2 | 726 | |
19baf839 RO |
727 | /* An empty child */ |
728 | if (node == NULL) | |
729 | continue; | |
730 | ||
731 | /* A leaf or an internal node with skipped bits */ | |
732 | ||
c877efb2 | 733 | if (IS_LEAF(node) || ((struct tnode *) node)->pos > |
19baf839 | 734 | tn->pos + tn->bits - 1) { |
a07f5f50 SH |
735 | if (tkey_extract_bits(node->key, |
736 | oldtnode->pos + oldtnode->bits, | |
737 | 1) == 0) | |
19baf839 RO |
738 | put_child(t, tn, 2*i, node); |
739 | else | |
740 | put_child(t, tn, 2*i+1, node); | |
741 | continue; | |
742 | } | |
743 | ||
744 | /* An internal node with two children */ | |
745 | inode = (struct tnode *) node; | |
746 | ||
747 | if (inode->bits == 1) { | |
748 | put_child(t, tn, 2*i, inode->child[0]); | |
749 | put_child(t, tn, 2*i+1, inode->child[1]); | |
750 | ||
751 | tnode_free(inode); | |
91b9a277 | 752 | continue; |
19baf839 RO |
753 | } |
754 | ||
91b9a277 OJ |
755 | /* An internal node with more than two children */ |
756 | ||
757 | /* We will replace this node 'inode' with two new | |
758 | * ones, 'left' and 'right', each with half of the | |
759 | * original children. The two new nodes will have | |
760 | * a position one bit further down the key and this | |
761 | * means that the "significant" part of their keys | |
762 | * (see the discussion near the top of this file) | |
763 | * will differ by one bit, which will be "0" in | |
764 | * left's key and "1" in right's key. Since we are | |
765 | * moving the key position by one step, the bit that | |
766 | * we are moving away from - the bit at position | |
767 | * (inode->pos) - is the one that will differ between | |
768 | * left and right. So... we synthesize that bit in the | |
769 | * two new keys. | |
770 | * The mask 'm' below will be a single "one" bit at | |
771 | * the position (inode->pos) | |
772 | */ | |
19baf839 | 773 | |
91b9a277 OJ |
774 | /* Use the old key, but set the new significant |
775 | * bit to zero. | |
776 | */ | |
2f36895a | 777 | |
91b9a277 OJ |
778 | left = (struct tnode *) tnode_get_child(tn, 2*i); |
779 | put_child(t, tn, 2*i, NULL); | |
2f36895a | 780 | |
91b9a277 | 781 | BUG_ON(!left); |
2f36895a | 782 | |
91b9a277 OJ |
783 | right = (struct tnode *) tnode_get_child(tn, 2*i+1); |
784 | put_child(t, tn, 2*i+1, NULL); | |
19baf839 | 785 | |
91b9a277 | 786 | BUG_ON(!right); |
19baf839 | 787 | |
91b9a277 OJ |
788 | size = tnode_child_length(left); |
789 | for (j = 0; j < size; j++) { | |
790 | put_child(t, left, j, inode->child[j]); | |
791 | put_child(t, right, j, inode->child[j + size]); | |
19baf839 | 792 | } |
91b9a277 OJ |
793 | put_child(t, tn, 2*i, resize(t, left)); |
794 | put_child(t, tn, 2*i+1, resize(t, right)); | |
795 | ||
796 | tnode_free(inode); | |
19baf839 RO |
797 | } |
798 | tnode_free(oldtnode); | |
799 | return tn; | |
2f80b3c8 RO |
800 | nomem: |
801 | { | |
802 | int size = tnode_child_length(tn); | |
803 | int j; | |
804 | ||
0c7770c7 | 805 | for (j = 0; j < size; j++) |
2f80b3c8 RO |
806 | if (tn->child[j]) |
807 | tnode_free((struct tnode *)tn->child[j]); | |
808 | ||
809 | tnode_free(tn); | |
0c7770c7 | 810 | |
2f80b3c8 RO |
811 | return ERR_PTR(-ENOMEM); |
812 | } | |
19baf839 RO |
813 | } |
814 | ||
2f80b3c8 | 815 | static struct tnode *halve(struct trie *t, struct tnode *tn) |
19baf839 RO |
816 | { |
817 | struct tnode *oldtnode = tn; | |
818 | struct node *left, *right; | |
819 | int i; | |
820 | int olen = tnode_child_length(tn); | |
821 | ||
0c7770c7 | 822 | pr_debug("In halve\n"); |
c877efb2 SH |
823 | |
824 | tn = tnode_new(oldtnode->key, oldtnode->pos, oldtnode->bits - 1); | |
19baf839 | 825 | |
2f80b3c8 RO |
826 | if (!tn) |
827 | return ERR_PTR(-ENOMEM); | |
2f36895a RO |
828 | |
829 | /* | |
c877efb2 SH |
830 | * Preallocate and store tnodes before the actual work so we |
831 | * don't get into an inconsistent state if memory allocation | |
832 | * fails. In case of failure we return the oldnode and halve | |
2f36895a RO |
833 | * of tnode is ignored. |
834 | */ | |
835 | ||
91b9a277 | 836 | for (i = 0; i < olen; i += 2) { |
2f36895a RO |
837 | left = tnode_get_child(oldtnode, i); |
838 | right = tnode_get_child(oldtnode, i+1); | |
c877efb2 | 839 | |
2f36895a | 840 | /* Two nonempty children */ |
0c7770c7 | 841 | if (left && right) { |
2f80b3c8 | 842 | struct tnode *newn; |
0c7770c7 | 843 | |
2f80b3c8 | 844 | newn = tnode_new(left->key, tn->pos + tn->bits, 1); |
0c7770c7 SH |
845 | |
846 | if (!newn) | |
2f80b3c8 | 847 | goto nomem; |
0c7770c7 | 848 | |
2f80b3c8 | 849 | put_child(t, tn, i/2, (struct node *)newn); |
2f36895a | 850 | } |
2f36895a | 851 | |
2f36895a | 852 | } |
19baf839 | 853 | |
91b9a277 OJ |
854 | for (i = 0; i < olen; i += 2) { |
855 | struct tnode *newBinNode; | |
856 | ||
19baf839 RO |
857 | left = tnode_get_child(oldtnode, i); |
858 | right = tnode_get_child(oldtnode, i+1); | |
c877efb2 | 859 | |
19baf839 RO |
860 | /* At least one of the children is empty */ |
861 | if (left == NULL) { | |
862 | if (right == NULL) /* Both are empty */ | |
863 | continue; | |
864 | put_child(t, tn, i/2, right); | |
91b9a277 | 865 | continue; |
0c7770c7 | 866 | } |
91b9a277 OJ |
867 | |
868 | if (right == NULL) { | |
19baf839 | 869 | put_child(t, tn, i/2, left); |
91b9a277 OJ |
870 | continue; |
871 | } | |
c877efb2 | 872 | |
19baf839 | 873 | /* Two nonempty children */ |
91b9a277 OJ |
874 | newBinNode = (struct tnode *) tnode_get_child(tn, i/2); |
875 | put_child(t, tn, i/2, NULL); | |
91b9a277 OJ |
876 | put_child(t, newBinNode, 0, left); |
877 | put_child(t, newBinNode, 1, right); | |
878 | put_child(t, tn, i/2, resize(t, newBinNode)); | |
19baf839 RO |
879 | } |
880 | tnode_free(oldtnode); | |
881 | return tn; | |
2f80b3c8 RO |
882 | nomem: |
883 | { | |
884 | int size = tnode_child_length(tn); | |
885 | int j; | |
886 | ||
0c7770c7 | 887 | for (j = 0; j < size; j++) |
2f80b3c8 RO |
888 | if (tn->child[j]) |
889 | tnode_free((struct tnode *)tn->child[j]); | |
890 | ||
891 | tnode_free(tn); | |
0c7770c7 | 892 | |
2f80b3c8 RO |
893 | return ERR_PTR(-ENOMEM); |
894 | } | |
19baf839 RO |
895 | } |
896 | ||
772cb712 | 897 | /* readside must use rcu_read_lock currently dump routines |
2373ce1c RO |
898 | via get_fa_head and dump */ |
899 | ||
772cb712 | 900 | static struct leaf_info *find_leaf_info(struct leaf *l, int plen) |
19baf839 | 901 | { |
772cb712 | 902 | struct hlist_head *head = &l->list; |
19baf839 RO |
903 | struct hlist_node *node; |
904 | struct leaf_info *li; | |
905 | ||
2373ce1c | 906 | hlist_for_each_entry_rcu(li, node, head, hlist) |
c877efb2 | 907 | if (li->plen == plen) |
19baf839 | 908 | return li; |
91b9a277 | 909 | |
19baf839 RO |
910 | return NULL; |
911 | } | |
912 | ||
a07f5f50 | 913 | static inline struct list_head *get_fa_head(struct leaf *l, int plen) |
19baf839 | 914 | { |
772cb712 | 915 | struct leaf_info *li = find_leaf_info(l, plen); |
c877efb2 | 916 | |
91b9a277 OJ |
917 | if (!li) |
918 | return NULL; | |
c877efb2 | 919 | |
91b9a277 | 920 | return &li->falh; |
19baf839 RO |
921 | } |
922 | ||
923 | static void insert_leaf_info(struct hlist_head *head, struct leaf_info *new) | |
924 | { | |
e905a9ed YH |
925 | struct leaf_info *li = NULL, *last = NULL; |
926 | struct hlist_node *node; | |
927 | ||
928 | if (hlist_empty(head)) { | |
929 | hlist_add_head_rcu(&new->hlist, head); | |
930 | } else { | |
931 | hlist_for_each_entry(li, node, head, hlist) { | |
932 | if (new->plen > li->plen) | |
933 | break; | |
934 | ||
935 | last = li; | |
936 | } | |
937 | if (last) | |
938 | hlist_add_after_rcu(&last->hlist, &new->hlist); | |
939 | else | |
940 | hlist_add_before_rcu(&new->hlist, &li->hlist); | |
941 | } | |
19baf839 RO |
942 | } |
943 | ||
2373ce1c RO |
944 | /* rcu_read_lock needs to be hold by caller from readside */ |
945 | ||
19baf839 RO |
946 | static struct leaf * |
947 | fib_find_node(struct trie *t, u32 key) | |
948 | { | |
949 | int pos; | |
950 | struct tnode *tn; | |
951 | struct node *n; | |
952 | ||
953 | pos = 0; | |
2373ce1c | 954 | n = rcu_dereference(t->trie); |
19baf839 RO |
955 | |
956 | while (n != NULL && NODE_TYPE(n) == T_TNODE) { | |
957 | tn = (struct tnode *) n; | |
91b9a277 | 958 | |
19baf839 | 959 | check_tnode(tn); |
91b9a277 | 960 | |
c877efb2 | 961 | if (tkey_sub_equals(tn->key, pos, tn->pos-pos, key)) { |
91b9a277 | 962 | pos = tn->pos + tn->bits; |
a07f5f50 SH |
963 | n = tnode_get_child_rcu(tn, |
964 | tkey_extract_bits(key, | |
965 | tn->pos, | |
966 | tn->bits)); | |
91b9a277 | 967 | } else |
19baf839 RO |
968 | break; |
969 | } | |
970 | /* Case we have found a leaf. Compare prefixes */ | |
971 | ||
91b9a277 OJ |
972 | if (n != NULL && IS_LEAF(n) && tkey_equals(key, n->key)) |
973 | return (struct leaf *)n; | |
974 | ||
19baf839 RO |
975 | return NULL; |
976 | } | |
977 | ||
978 | static struct node *trie_rebalance(struct trie *t, struct tnode *tn) | |
979 | { | |
19baf839 | 980 | int wasfull; |
06801916 SH |
981 | t_key cindex, key = tn->key; |
982 | struct tnode *tp; | |
19baf839 | 983 | |
06801916 | 984 | while (tn != NULL && (tp = node_parent((struct node *)tn)) != NULL) { |
19baf839 RO |
985 | cindex = tkey_extract_bits(key, tp->pos, tp->bits); |
986 | wasfull = tnode_full(tp, tnode_get_child(tp, cindex)); | |
a07f5f50 SH |
987 | tn = (struct tnode *) resize(t, (struct tnode *)tn); |
988 | ||
989 | tnode_put_child_reorg((struct tnode *)tp, cindex, | |
990 | (struct node *)tn, wasfull); | |
91b9a277 | 991 | |
06801916 SH |
992 | tp = node_parent((struct node *) tn); |
993 | if (!tp) | |
19baf839 | 994 | break; |
06801916 | 995 | tn = tp; |
19baf839 | 996 | } |
06801916 | 997 | |
19baf839 | 998 | /* Handle last (top) tnode */ |
c877efb2 | 999 | if (IS_TNODE(tn)) |
a07f5f50 | 1000 | tn = (struct tnode *)resize(t, (struct tnode *)tn); |
19baf839 | 1001 | |
a07f5f50 | 1002 | return (struct node *)tn; |
19baf839 RO |
1003 | } |
1004 | ||
2373ce1c RO |
1005 | /* only used from updater-side */ |
1006 | ||
fea86ad8 | 1007 | static struct list_head *fib_insert_node(struct trie *t, u32 key, int plen) |
19baf839 RO |
1008 | { |
1009 | int pos, newpos; | |
1010 | struct tnode *tp = NULL, *tn = NULL; | |
1011 | struct node *n; | |
1012 | struct leaf *l; | |
1013 | int missbit; | |
c877efb2 | 1014 | struct list_head *fa_head = NULL; |
19baf839 RO |
1015 | struct leaf_info *li; |
1016 | t_key cindex; | |
1017 | ||
1018 | pos = 0; | |
c877efb2 | 1019 | n = t->trie; |
19baf839 | 1020 | |
c877efb2 SH |
1021 | /* If we point to NULL, stop. Either the tree is empty and we should |
1022 | * just put a new leaf in if, or we have reached an empty child slot, | |
19baf839 | 1023 | * and we should just put our new leaf in that. |
c877efb2 SH |
1024 | * If we point to a T_TNODE, check if it matches our key. Note that |
1025 | * a T_TNODE might be skipping any number of bits - its 'pos' need | |
19baf839 RO |
1026 | * not be the parent's 'pos'+'bits'! |
1027 | * | |
c877efb2 | 1028 | * If it does match the current key, get pos/bits from it, extract |
19baf839 RO |
1029 | * the index from our key, push the T_TNODE and walk the tree. |
1030 | * | |
1031 | * If it doesn't, we have to replace it with a new T_TNODE. | |
1032 | * | |
c877efb2 SH |
1033 | * If we point to a T_LEAF, it might or might not have the same key |
1034 | * as we do. If it does, just change the value, update the T_LEAF's | |
1035 | * value, and return it. | |
19baf839 RO |
1036 | * If it doesn't, we need to replace it with a T_TNODE. |
1037 | */ | |
1038 | ||
1039 | while (n != NULL && NODE_TYPE(n) == T_TNODE) { | |
1040 | tn = (struct tnode *) n; | |
91b9a277 | 1041 | |
c877efb2 | 1042 | check_tnode(tn); |
91b9a277 | 1043 | |
c877efb2 | 1044 | if (tkey_sub_equals(tn->key, pos, tn->pos-pos, key)) { |
19baf839 | 1045 | tp = tn; |
91b9a277 | 1046 | pos = tn->pos + tn->bits; |
a07f5f50 SH |
1047 | n = tnode_get_child(tn, |
1048 | tkey_extract_bits(key, | |
1049 | tn->pos, | |
1050 | tn->bits)); | |
19baf839 | 1051 | |
06801916 | 1052 | BUG_ON(n && node_parent(n) != tn); |
91b9a277 | 1053 | } else |
19baf839 RO |
1054 | break; |
1055 | } | |
1056 | ||
1057 | /* | |
1058 | * n ----> NULL, LEAF or TNODE | |
1059 | * | |
c877efb2 | 1060 | * tp is n's (parent) ----> NULL or TNODE |
19baf839 RO |
1061 | */ |
1062 | ||
91b9a277 | 1063 | BUG_ON(tp && IS_LEAF(tp)); |
19baf839 RO |
1064 | |
1065 | /* Case 1: n is a leaf. Compare prefixes */ | |
1066 | ||
c877efb2 | 1067 | if (n != NULL && IS_LEAF(n) && tkey_equals(key, n->key)) { |
c95aaf9a | 1068 | l = (struct leaf *) n; |
19baf839 | 1069 | li = leaf_info_new(plen); |
91b9a277 | 1070 | |
fea86ad8 SH |
1071 | if (!li) |
1072 | return NULL; | |
19baf839 RO |
1073 | |
1074 | fa_head = &li->falh; | |
1075 | insert_leaf_info(&l->list, li); | |
1076 | goto done; | |
1077 | } | |
19baf839 RO |
1078 | l = leaf_new(); |
1079 | ||
fea86ad8 SH |
1080 | if (!l) |
1081 | return NULL; | |
19baf839 RO |
1082 | |
1083 | l->key = key; | |
1084 | li = leaf_info_new(plen); | |
1085 | ||
c877efb2 | 1086 | if (!li) { |
f835e471 | 1087 | tnode_free((struct tnode *) l); |
fea86ad8 | 1088 | return NULL; |
f835e471 | 1089 | } |
19baf839 RO |
1090 | |
1091 | fa_head = &li->falh; | |
1092 | insert_leaf_info(&l->list, li); | |
1093 | ||
19baf839 | 1094 | if (t->trie && n == NULL) { |
91b9a277 | 1095 | /* Case 2: n is NULL, and will just insert a new leaf */ |
19baf839 | 1096 | |
06801916 | 1097 | node_set_parent((struct node *)l, tp); |
19baf839 | 1098 | |
91b9a277 OJ |
1099 | cindex = tkey_extract_bits(key, tp->pos, tp->bits); |
1100 | put_child(t, (struct tnode *)tp, cindex, (struct node *)l); | |
1101 | } else { | |
1102 | /* Case 3: n is a LEAF or a TNODE and the key doesn't match. */ | |
c877efb2 SH |
1103 | /* |
1104 | * Add a new tnode here | |
19baf839 RO |
1105 | * first tnode need some special handling |
1106 | */ | |
1107 | ||
1108 | if (tp) | |
91b9a277 | 1109 | pos = tp->pos+tp->bits; |
19baf839 | 1110 | else |
91b9a277 OJ |
1111 | pos = 0; |
1112 | ||
c877efb2 | 1113 | if (n) { |
19baf839 RO |
1114 | newpos = tkey_mismatch(key, pos, n->key); |
1115 | tn = tnode_new(n->key, newpos, 1); | |
91b9a277 | 1116 | } else { |
19baf839 | 1117 | newpos = 0; |
c877efb2 | 1118 | tn = tnode_new(key, newpos, 1); /* First tnode */ |
19baf839 | 1119 | } |
19baf839 | 1120 | |
c877efb2 | 1121 | if (!tn) { |
f835e471 RO |
1122 | free_leaf_info(li); |
1123 | tnode_free((struct tnode *) l); | |
fea86ad8 | 1124 | return NULL; |
91b9a277 OJ |
1125 | } |
1126 | ||
06801916 | 1127 | node_set_parent((struct node *)tn, tp); |
19baf839 | 1128 | |
91b9a277 | 1129 | missbit = tkey_extract_bits(key, newpos, 1); |
19baf839 RO |
1130 | put_child(t, tn, missbit, (struct node *)l); |
1131 | put_child(t, tn, 1-missbit, n); | |
1132 | ||
c877efb2 | 1133 | if (tp) { |
19baf839 | 1134 | cindex = tkey_extract_bits(key, tp->pos, tp->bits); |
a07f5f50 SH |
1135 | put_child(t, (struct tnode *)tp, cindex, |
1136 | (struct node *)tn); | |
91b9a277 | 1137 | } else { |
a07f5f50 | 1138 | rcu_assign_pointer(t->trie, (struct node *)tn); |
19baf839 RO |
1139 | tp = tn; |
1140 | } | |
1141 | } | |
91b9a277 OJ |
1142 | |
1143 | if (tp && tp->pos + tp->bits > 32) | |
a07f5f50 SH |
1144 | pr_warning("fib_trie" |
1145 | " tp=%p pos=%d, bits=%d, key=%0x plen=%d\n", | |
1146 | tp, tp->pos, tp->bits, key, plen); | |
91b9a277 | 1147 | |
19baf839 | 1148 | /* Rebalance the trie */ |
2373ce1c RO |
1149 | |
1150 | rcu_assign_pointer(t->trie, trie_rebalance(t, tp)); | |
f835e471 | 1151 | done: |
19baf839 RO |
1152 | return fa_head; |
1153 | } | |
1154 | ||
d562f1f8 RO |
1155 | /* |
1156 | * Caller must hold RTNL. | |
1157 | */ | |
4e902c57 | 1158 | static int fn_trie_insert(struct fib_table *tb, struct fib_config *cfg) |
19baf839 RO |
1159 | { |
1160 | struct trie *t = (struct trie *) tb->tb_data; | |
1161 | struct fib_alias *fa, *new_fa; | |
c877efb2 | 1162 | struct list_head *fa_head = NULL; |
19baf839 | 1163 | struct fib_info *fi; |
4e902c57 TG |
1164 | int plen = cfg->fc_dst_len; |
1165 | u8 tos = cfg->fc_tos; | |
19baf839 RO |
1166 | u32 key, mask; |
1167 | int err; | |
1168 | struct leaf *l; | |
1169 | ||
1170 | if (plen > 32) | |
1171 | return -EINVAL; | |
1172 | ||
4e902c57 | 1173 | key = ntohl(cfg->fc_dst); |
19baf839 | 1174 | |
2dfe55b4 | 1175 | pr_debug("Insert table=%u %08x/%d\n", tb->tb_id, key, plen); |
19baf839 | 1176 | |
91b9a277 | 1177 | mask = ntohl(inet_make_mask(plen)); |
19baf839 | 1178 | |
c877efb2 | 1179 | if (key & ~mask) |
19baf839 RO |
1180 | return -EINVAL; |
1181 | ||
1182 | key = key & mask; | |
1183 | ||
4e902c57 TG |
1184 | fi = fib_create_info(cfg); |
1185 | if (IS_ERR(fi)) { | |
1186 | err = PTR_ERR(fi); | |
19baf839 | 1187 | goto err; |
4e902c57 | 1188 | } |
19baf839 RO |
1189 | |
1190 | l = fib_find_node(t, key); | |
c877efb2 | 1191 | fa = NULL; |
19baf839 | 1192 | |
c877efb2 | 1193 | if (l) { |
19baf839 RO |
1194 | fa_head = get_fa_head(l, plen); |
1195 | fa = fib_find_alias(fa_head, tos, fi->fib_priority); | |
1196 | } | |
1197 | ||
1198 | /* Now fa, if non-NULL, points to the first fib alias | |
1199 | * with the same keys [prefix,tos,priority], if such key already | |
1200 | * exists or to the node before which we will insert new one. | |
1201 | * | |
1202 | * If fa is NULL, we will need to allocate a new one and | |
1203 | * insert to the head of f. | |
1204 | * | |
1205 | * If f is NULL, no fib node matched the destination key | |
1206 | * and we need to allocate a new one of those as well. | |
1207 | */ | |
1208 | ||
91b9a277 | 1209 | if (fa && fa->fa_info->fib_priority == fi->fib_priority) { |
19baf839 RO |
1210 | struct fib_alias *fa_orig; |
1211 | ||
1212 | err = -EEXIST; | |
4e902c57 | 1213 | if (cfg->fc_nlflags & NLM_F_EXCL) |
19baf839 RO |
1214 | goto out; |
1215 | ||
4e902c57 | 1216 | if (cfg->fc_nlflags & NLM_F_REPLACE) { |
19baf839 RO |
1217 | struct fib_info *fi_drop; |
1218 | u8 state; | |
1219 | ||
6725033f JP |
1220 | if (fi->fib_treeref > 1) |
1221 | goto out; | |
1222 | ||
2373ce1c | 1223 | err = -ENOBUFS; |
e94b1766 | 1224 | new_fa = kmem_cache_alloc(fn_alias_kmem, GFP_KERNEL); |
2373ce1c RO |
1225 | if (new_fa == NULL) |
1226 | goto out; | |
19baf839 RO |
1227 | |
1228 | fi_drop = fa->fa_info; | |
2373ce1c RO |
1229 | new_fa->fa_tos = fa->fa_tos; |
1230 | new_fa->fa_info = fi; | |
4e902c57 TG |
1231 | new_fa->fa_type = cfg->fc_type; |
1232 | new_fa->fa_scope = cfg->fc_scope; | |
19baf839 | 1233 | state = fa->fa_state; |
2373ce1c | 1234 | new_fa->fa_state &= ~FA_S_ACCESSED; |
19baf839 | 1235 | |
2373ce1c RO |
1236 | list_replace_rcu(&fa->fa_list, &new_fa->fa_list); |
1237 | alias_free_mem_rcu(fa); | |
19baf839 RO |
1238 | |
1239 | fib_release_info(fi_drop); | |
1240 | if (state & FA_S_ACCESSED) | |
91b9a277 | 1241 | rt_cache_flush(-1); |
b8f55831 MK |
1242 | rtmsg_fib(RTM_NEWROUTE, htonl(key), new_fa, plen, |
1243 | tb->tb_id, &cfg->fc_nlinfo, NLM_F_REPLACE); | |
19baf839 | 1244 | |
91b9a277 | 1245 | goto succeeded; |
19baf839 RO |
1246 | } |
1247 | /* Error if we find a perfect match which | |
1248 | * uses the same scope, type, and nexthop | |
1249 | * information. | |
1250 | */ | |
1251 | fa_orig = fa; | |
1252 | list_for_each_entry(fa, fa_orig->fa_list.prev, fa_list) { | |
1253 | if (fa->fa_tos != tos) | |
1254 | break; | |
1255 | if (fa->fa_info->fib_priority != fi->fib_priority) | |
1256 | break; | |
4e902c57 TG |
1257 | if (fa->fa_type == cfg->fc_type && |
1258 | fa->fa_scope == cfg->fc_scope && | |
a07f5f50 | 1259 | fa->fa_info == fi) |
19baf839 | 1260 | goto out; |
19baf839 | 1261 | } |
a07f5f50 | 1262 | |
4e902c57 | 1263 | if (!(cfg->fc_nlflags & NLM_F_APPEND)) |
19baf839 RO |
1264 | fa = fa_orig; |
1265 | } | |
1266 | err = -ENOENT; | |
4e902c57 | 1267 | if (!(cfg->fc_nlflags & NLM_F_CREATE)) |
19baf839 RO |
1268 | goto out; |
1269 | ||
1270 | err = -ENOBUFS; | |
e94b1766 | 1271 | new_fa = kmem_cache_alloc(fn_alias_kmem, GFP_KERNEL); |
19baf839 RO |
1272 | if (new_fa == NULL) |
1273 | goto out; | |
1274 | ||
1275 | new_fa->fa_info = fi; | |
1276 | new_fa->fa_tos = tos; | |
4e902c57 TG |
1277 | new_fa->fa_type = cfg->fc_type; |
1278 | new_fa->fa_scope = cfg->fc_scope; | |
19baf839 | 1279 | new_fa->fa_state = 0; |
19baf839 RO |
1280 | /* |
1281 | * Insert new entry to the list. | |
1282 | */ | |
1283 | ||
c877efb2 | 1284 | if (!fa_head) { |
fea86ad8 SH |
1285 | fa_head = fib_insert_node(t, key, plen); |
1286 | if (unlikely(!fa_head)) { | |
1287 | err = -ENOMEM; | |
f835e471 | 1288 | goto out_free_new_fa; |
fea86ad8 | 1289 | } |
f835e471 | 1290 | } |
19baf839 | 1291 | |
2373ce1c RO |
1292 | list_add_tail_rcu(&new_fa->fa_list, |
1293 | (fa ? &fa->fa_list : fa_head)); | |
19baf839 RO |
1294 | |
1295 | rt_cache_flush(-1); | |
4e902c57 | 1296 | rtmsg_fib(RTM_NEWROUTE, htonl(key), new_fa, plen, tb->tb_id, |
b8f55831 | 1297 | &cfg->fc_nlinfo, 0); |
19baf839 RO |
1298 | succeeded: |
1299 | return 0; | |
f835e471 RO |
1300 | |
1301 | out_free_new_fa: | |
1302 | kmem_cache_free(fn_alias_kmem, new_fa); | |
19baf839 RO |
1303 | out: |
1304 | fib_release_info(fi); | |
91b9a277 | 1305 | err: |
19baf839 RO |
1306 | return err; |
1307 | } | |
1308 | ||
2373ce1c | 1309 | |
772cb712 | 1310 | /* should be called with rcu_read_lock */ |
a07f5f50 SH |
1311 | static int check_leaf(struct trie *t, struct leaf *l, |
1312 | t_key key, const struct flowi *flp, | |
1313 | struct fib_result *res) | |
19baf839 | 1314 | { |
19baf839 RO |
1315 | struct leaf_info *li; |
1316 | struct hlist_head *hhead = &l->list; | |
1317 | struct hlist_node *node; | |
c877efb2 | 1318 | |
2373ce1c | 1319 | hlist_for_each_entry_rcu(li, node, hhead, hlist) { |
a07f5f50 SH |
1320 | int err; |
1321 | int plen = li->plen; | |
1322 | __be32 mask = inet_make_mask(plen); | |
1323 | ||
888454c5 | 1324 | if (l->key != (key & ntohl(mask))) |
19baf839 RO |
1325 | continue; |
1326 | ||
a07f5f50 SH |
1327 | err = fib_semantic_match(&li->falh, flp, res, |
1328 | htonl(l->key), mask, plen); | |
1329 | ||
19baf839 | 1330 | #ifdef CONFIG_IP_FIB_TRIE_STATS |
a07f5f50 | 1331 | if (err <= 0) |
19baf839 | 1332 | t->stats.semantic_match_passed++; |
a07f5f50 SH |
1333 | else |
1334 | t->stats.semantic_match_miss++; | |
19baf839 | 1335 | #endif |
a07f5f50 SH |
1336 | if (err <= 0) |
1337 | return plen; | |
19baf839 | 1338 | } |
a07f5f50 SH |
1339 | |
1340 | return -1; | |
19baf839 RO |
1341 | } |
1342 | ||
a07f5f50 SH |
1343 | static int fn_trie_lookup(struct fib_table *tb, const struct flowi *flp, |
1344 | struct fib_result *res) | |
19baf839 RO |
1345 | { |
1346 | struct trie *t = (struct trie *) tb->tb_data; | |
1347 | int plen, ret = 0; | |
1348 | struct node *n; | |
1349 | struct tnode *pn; | |
1350 | int pos, bits; | |
91b9a277 | 1351 | t_key key = ntohl(flp->fl4_dst); |
19baf839 RO |
1352 | int chopped_off; |
1353 | t_key cindex = 0; | |
1354 | int current_prefix_length = KEYLENGTH; | |
91b9a277 OJ |
1355 | struct tnode *cn; |
1356 | t_key node_prefix, key_prefix, pref_mismatch; | |
1357 | int mp; | |
1358 | ||
2373ce1c | 1359 | rcu_read_lock(); |
91b9a277 | 1360 | |
2373ce1c | 1361 | n = rcu_dereference(t->trie); |
c877efb2 | 1362 | if (!n) |
19baf839 RO |
1363 | goto failed; |
1364 | ||
1365 | #ifdef CONFIG_IP_FIB_TRIE_STATS | |
1366 | t->stats.gets++; | |
1367 | #endif | |
1368 | ||
1369 | /* Just a leaf? */ | |
1370 | if (IS_LEAF(n)) { | |
a07f5f50 SH |
1371 | plen = check_leaf(t, (struct leaf *)n, key, flp, res); |
1372 | if (plen < 0) | |
1373 | goto failed; | |
1374 | ret = 0; | |
1375 | goto found; | |
19baf839 | 1376 | } |
a07f5f50 | 1377 | |
19baf839 RO |
1378 | pn = (struct tnode *) n; |
1379 | chopped_off = 0; | |
c877efb2 | 1380 | |
91b9a277 | 1381 | while (pn) { |
19baf839 RO |
1382 | pos = pn->pos; |
1383 | bits = pn->bits; | |
1384 | ||
c877efb2 | 1385 | if (!chopped_off) |
ab66b4a7 SH |
1386 | cindex = tkey_extract_bits(mask_pfx(key, current_prefix_length), |
1387 | pos, bits); | |
19baf839 RO |
1388 | |
1389 | n = tnode_get_child(pn, cindex); | |
1390 | ||
1391 | if (n == NULL) { | |
1392 | #ifdef CONFIG_IP_FIB_TRIE_STATS | |
1393 | t->stats.null_node_hit++; | |
1394 | #endif | |
1395 | goto backtrace; | |
1396 | } | |
1397 | ||
91b9a277 | 1398 | if (IS_LEAF(n)) { |
a07f5f50 SH |
1399 | plen = check_leaf(t, (struct leaf *)n, key, flp, res); |
1400 | if (plen < 0) | |
91b9a277 | 1401 | goto backtrace; |
a07f5f50 SH |
1402 | |
1403 | ret = 0; | |
1404 | goto found; | |
91b9a277 OJ |
1405 | } |
1406 | ||
91b9a277 | 1407 | cn = (struct tnode *)n; |
19baf839 | 1408 | |
91b9a277 OJ |
1409 | /* |
1410 | * It's a tnode, and we can do some extra checks here if we | |
1411 | * like, to avoid descending into a dead-end branch. | |
1412 | * This tnode is in the parent's child array at index | |
1413 | * key[p_pos..p_pos+p_bits] but potentially with some bits | |
1414 | * chopped off, so in reality the index may be just a | |
1415 | * subprefix, padded with zero at the end. | |
1416 | * We can also take a look at any skipped bits in this | |
1417 | * tnode - everything up to p_pos is supposed to be ok, | |
1418 | * and the non-chopped bits of the index (se previous | |
1419 | * paragraph) are also guaranteed ok, but the rest is | |
1420 | * considered unknown. | |
1421 | * | |
1422 | * The skipped bits are key[pos+bits..cn->pos]. | |
1423 | */ | |
19baf839 | 1424 | |
91b9a277 OJ |
1425 | /* If current_prefix_length < pos+bits, we are already doing |
1426 | * actual prefix matching, which means everything from | |
1427 | * pos+(bits-chopped_off) onward must be zero along some | |
1428 | * branch of this subtree - otherwise there is *no* valid | |
1429 | * prefix present. Here we can only check the skipped | |
1430 | * bits. Remember, since we have already indexed into the | |
1431 | * parent's child array, we know that the bits we chopped of | |
1432 | * *are* zero. | |
1433 | */ | |
19baf839 | 1434 | |
a07f5f50 SH |
1435 | /* NOTA BENE: Checking only skipped bits |
1436 | for the new node here */ | |
19baf839 | 1437 | |
91b9a277 OJ |
1438 | if (current_prefix_length < pos+bits) { |
1439 | if (tkey_extract_bits(cn->key, current_prefix_length, | |
a07f5f50 SH |
1440 | cn->pos - current_prefix_length) |
1441 | || !(cn->child[0])) | |
91b9a277 OJ |
1442 | goto backtrace; |
1443 | } | |
19baf839 | 1444 | |
91b9a277 OJ |
1445 | /* |
1446 | * If chopped_off=0, the index is fully validated and we | |
1447 | * only need to look at the skipped bits for this, the new, | |
1448 | * tnode. What we actually want to do is to find out if | |
1449 | * these skipped bits match our key perfectly, or if we will | |
1450 | * have to count on finding a matching prefix further down, | |
1451 | * because if we do, we would like to have some way of | |
1452 | * verifying the existence of such a prefix at this point. | |
1453 | */ | |
19baf839 | 1454 | |
91b9a277 OJ |
1455 | /* The only thing we can do at this point is to verify that |
1456 | * any such matching prefix can indeed be a prefix to our | |
1457 | * key, and if the bits in the node we are inspecting that | |
1458 | * do not match our key are not ZERO, this cannot be true. | |
1459 | * Thus, find out where there is a mismatch (before cn->pos) | |
1460 | * and verify that all the mismatching bits are zero in the | |
1461 | * new tnode's key. | |
1462 | */ | |
19baf839 | 1463 | |
a07f5f50 SH |
1464 | /* |
1465 | * Note: We aren't very concerned about the piece of | |
1466 | * the key that precede pn->pos+pn->bits, since these | |
1467 | * have already been checked. The bits after cn->pos | |
1468 | * aren't checked since these are by definition | |
1469 | * "unknown" at this point. Thus, what we want to see | |
1470 | * is if we are about to enter the "prefix matching" | |
1471 | * state, and in that case verify that the skipped | |
1472 | * bits that will prevail throughout this subtree are | |
1473 | * zero, as they have to be if we are to find a | |
1474 | * matching prefix. | |
91b9a277 OJ |
1475 | */ |
1476 | ||
ab66b4a7 SH |
1477 | node_prefix = mask_pfx(cn->key, cn->pos); |
1478 | key_prefix = mask_pfx(key, cn->pos); | |
91b9a277 OJ |
1479 | pref_mismatch = key_prefix^node_prefix; |
1480 | mp = 0; | |
1481 | ||
a07f5f50 SH |
1482 | /* |
1483 | * In short: If skipped bits in this node do not match | |
1484 | * the search key, enter the "prefix matching" | |
1485 | * state.directly. | |
91b9a277 OJ |
1486 | */ |
1487 | if (pref_mismatch) { | |
1488 | while (!(pref_mismatch & (1<<(KEYLENGTH-1)))) { | |
1489 | mp++; | |
a07f5f50 | 1490 | pref_mismatch = pref_mismatch << 1; |
91b9a277 OJ |
1491 | } |
1492 | key_prefix = tkey_extract_bits(cn->key, mp, cn->pos-mp); | |
1493 | ||
1494 | if (key_prefix != 0) | |
1495 | goto backtrace; | |
1496 | ||
1497 | if (current_prefix_length >= cn->pos) | |
1498 | current_prefix_length = mp; | |
c877efb2 | 1499 | } |
a07f5f50 | 1500 | |
91b9a277 OJ |
1501 | pn = (struct tnode *)n; /* Descend */ |
1502 | chopped_off = 0; | |
1503 | continue; | |
1504 | ||
19baf839 RO |
1505 | backtrace: |
1506 | chopped_off++; | |
1507 | ||
1508 | /* As zero don't change the child key (cindex) */ | |
a07f5f50 SH |
1509 | while ((chopped_off <= pn->bits) |
1510 | && !(cindex & (1<<(chopped_off-1)))) | |
19baf839 | 1511 | chopped_off++; |
19baf839 RO |
1512 | |
1513 | /* Decrease current_... with bits chopped off */ | |
1514 | if (current_prefix_length > pn->pos + pn->bits - chopped_off) | |
a07f5f50 SH |
1515 | current_prefix_length = pn->pos + pn->bits |
1516 | - chopped_off; | |
91b9a277 | 1517 | |
19baf839 | 1518 | /* |
c877efb2 | 1519 | * Either we do the actual chop off according or if we have |
19baf839 RO |
1520 | * chopped off all bits in this tnode walk up to our parent. |
1521 | */ | |
1522 | ||
91b9a277 | 1523 | if (chopped_off <= pn->bits) { |
19baf839 | 1524 | cindex &= ~(1 << (chopped_off-1)); |
91b9a277 | 1525 | } else { |
06801916 SH |
1526 | struct tnode *parent = node_parent((struct node *) pn); |
1527 | if (!parent) | |
19baf839 | 1528 | goto failed; |
91b9a277 | 1529 | |
19baf839 | 1530 | /* Get Child's index */ |
06801916 SH |
1531 | cindex = tkey_extract_bits(pn->key, parent->pos, parent->bits); |
1532 | pn = parent; | |
19baf839 RO |
1533 | chopped_off = 0; |
1534 | ||
1535 | #ifdef CONFIG_IP_FIB_TRIE_STATS | |
1536 | t->stats.backtrack++; | |
1537 | #endif | |
1538 | goto backtrace; | |
c877efb2 | 1539 | } |
19baf839 RO |
1540 | } |
1541 | failed: | |
c877efb2 | 1542 | ret = 1; |
19baf839 | 1543 | found: |
2373ce1c | 1544 | rcu_read_unlock(); |
19baf839 RO |
1545 | return ret; |
1546 | } | |
1547 | ||
2373ce1c | 1548 | /* only called from updater side */ |
19baf839 RO |
1549 | static int trie_leaf_remove(struct trie *t, t_key key) |
1550 | { | |
1551 | t_key cindex; | |
1552 | struct tnode *tp = NULL; | |
1553 | struct node *n = t->trie; | |
1554 | struct leaf *l; | |
1555 | ||
0c7770c7 | 1556 | pr_debug("entering trie_leaf_remove(%p)\n", n); |
19baf839 RO |
1557 | |
1558 | /* Note that in the case skipped bits, those bits are *not* checked! | |
c877efb2 | 1559 | * When we finish this, we will have NULL or a T_LEAF, and the |
19baf839 RO |
1560 | * T_LEAF may or may not match our key. |
1561 | */ | |
1562 | ||
91b9a277 | 1563 | while (n != NULL && IS_TNODE(n)) { |
19baf839 RO |
1564 | struct tnode *tn = (struct tnode *) n; |
1565 | check_tnode(tn); | |
a07f5f50 SH |
1566 | n = tnode_get_child(tn, tkey_extract_bits(key, |
1567 | tn->pos, tn->bits)); | |
19baf839 | 1568 | |
06801916 | 1569 | BUG_ON(n && node_parent(n) != tn); |
91b9a277 | 1570 | } |
19baf839 RO |
1571 | l = (struct leaf *) n; |
1572 | ||
c877efb2 | 1573 | if (!n || !tkey_equals(l->key, key)) |
19baf839 | 1574 | return 0; |
c877efb2 SH |
1575 | |
1576 | /* | |
1577 | * Key found. | |
1578 | * Remove the leaf and rebalance the tree | |
19baf839 | 1579 | */ |
06801916 | 1580 | tp = node_parent(n); |
19baf839 RO |
1581 | tnode_free((struct tnode *) n); |
1582 | ||
c877efb2 | 1583 | if (tp) { |
19baf839 RO |
1584 | cindex = tkey_extract_bits(key, tp->pos, tp->bits); |
1585 | put_child(t, (struct tnode *)tp, cindex, NULL); | |
2373ce1c | 1586 | rcu_assign_pointer(t->trie, trie_rebalance(t, tp)); |
91b9a277 | 1587 | } else |
2373ce1c | 1588 | rcu_assign_pointer(t->trie, NULL); |
19baf839 RO |
1589 | |
1590 | return 1; | |
1591 | } | |
1592 | ||
d562f1f8 RO |
1593 | /* |
1594 | * Caller must hold RTNL. | |
1595 | */ | |
4e902c57 | 1596 | static int fn_trie_delete(struct fib_table *tb, struct fib_config *cfg) |
19baf839 RO |
1597 | { |
1598 | struct trie *t = (struct trie *) tb->tb_data; | |
1599 | u32 key, mask; | |
4e902c57 TG |
1600 | int plen = cfg->fc_dst_len; |
1601 | u8 tos = cfg->fc_tos; | |
19baf839 RO |
1602 | struct fib_alias *fa, *fa_to_delete; |
1603 | struct list_head *fa_head; | |
1604 | struct leaf *l; | |
91b9a277 OJ |
1605 | struct leaf_info *li; |
1606 | ||
c877efb2 | 1607 | if (plen > 32) |
19baf839 RO |
1608 | return -EINVAL; |
1609 | ||
4e902c57 | 1610 | key = ntohl(cfg->fc_dst); |
91b9a277 | 1611 | mask = ntohl(inet_make_mask(plen)); |
19baf839 | 1612 | |
c877efb2 | 1613 | if (key & ~mask) |
19baf839 RO |
1614 | return -EINVAL; |
1615 | ||
1616 | key = key & mask; | |
1617 | l = fib_find_node(t, key); | |
1618 | ||
c877efb2 | 1619 | if (!l) |
19baf839 RO |
1620 | return -ESRCH; |
1621 | ||
1622 | fa_head = get_fa_head(l, plen); | |
1623 | fa = fib_find_alias(fa_head, tos, 0); | |
1624 | ||
1625 | if (!fa) | |
1626 | return -ESRCH; | |
1627 | ||
0c7770c7 | 1628 | pr_debug("Deleting %08x/%d tos=%d t=%p\n", key, plen, tos, t); |
19baf839 RO |
1629 | |
1630 | fa_to_delete = NULL; | |
1631 | fa_head = fa->fa_list.prev; | |
2373ce1c | 1632 | |
19baf839 RO |
1633 | list_for_each_entry(fa, fa_head, fa_list) { |
1634 | struct fib_info *fi = fa->fa_info; | |
1635 | ||
1636 | if (fa->fa_tos != tos) | |
1637 | break; | |
1638 | ||
4e902c57 TG |
1639 | if ((!cfg->fc_type || fa->fa_type == cfg->fc_type) && |
1640 | (cfg->fc_scope == RT_SCOPE_NOWHERE || | |
1641 | fa->fa_scope == cfg->fc_scope) && | |
1642 | (!cfg->fc_protocol || | |
1643 | fi->fib_protocol == cfg->fc_protocol) && | |
1644 | fib_nh_match(cfg, fi) == 0) { | |
19baf839 RO |
1645 | fa_to_delete = fa; |
1646 | break; | |
1647 | } | |
1648 | } | |
1649 | ||
91b9a277 OJ |
1650 | if (!fa_to_delete) |
1651 | return -ESRCH; | |
19baf839 | 1652 | |
91b9a277 | 1653 | fa = fa_to_delete; |
4e902c57 | 1654 | rtmsg_fib(RTM_DELROUTE, htonl(key), fa, plen, tb->tb_id, |
b8f55831 | 1655 | &cfg->fc_nlinfo, 0); |
91b9a277 OJ |
1656 | |
1657 | l = fib_find_node(t, key); | |
772cb712 | 1658 | li = find_leaf_info(l, plen); |
19baf839 | 1659 | |
2373ce1c | 1660 | list_del_rcu(&fa->fa_list); |
19baf839 | 1661 | |
91b9a277 | 1662 | if (list_empty(fa_head)) { |
2373ce1c | 1663 | hlist_del_rcu(&li->hlist); |
91b9a277 | 1664 | free_leaf_info(li); |
2373ce1c | 1665 | } |
19baf839 | 1666 | |
91b9a277 OJ |
1667 | if (hlist_empty(&l->list)) |
1668 | trie_leaf_remove(t, key); | |
19baf839 | 1669 | |
91b9a277 OJ |
1670 | if (fa->fa_state & FA_S_ACCESSED) |
1671 | rt_cache_flush(-1); | |
19baf839 | 1672 | |
2373ce1c RO |
1673 | fib_release_info(fa->fa_info); |
1674 | alias_free_mem_rcu(fa); | |
91b9a277 | 1675 | return 0; |
19baf839 RO |
1676 | } |
1677 | ||
1678 | static int trie_flush_list(struct trie *t, struct list_head *head) | |
1679 | { | |
1680 | struct fib_alias *fa, *fa_node; | |
1681 | int found = 0; | |
1682 | ||
1683 | list_for_each_entry_safe(fa, fa_node, head, fa_list) { | |
1684 | struct fib_info *fi = fa->fa_info; | |
19baf839 | 1685 | |
2373ce1c RO |
1686 | if (fi && (fi->fib_flags & RTNH_F_DEAD)) { |
1687 | list_del_rcu(&fa->fa_list); | |
1688 | fib_release_info(fa->fa_info); | |
1689 | alias_free_mem_rcu(fa); | |
19baf839 RO |
1690 | found++; |
1691 | } | |
1692 | } | |
1693 | return found; | |
1694 | } | |
1695 | ||
1696 | static int trie_flush_leaf(struct trie *t, struct leaf *l) | |
1697 | { | |
1698 | int found = 0; | |
1699 | struct hlist_head *lih = &l->list; | |
1700 | struct hlist_node *node, *tmp; | |
1701 | struct leaf_info *li = NULL; | |
1702 | ||
1703 | hlist_for_each_entry_safe(li, node, tmp, lih, hlist) { | |
19baf839 RO |
1704 | found += trie_flush_list(t, &li->falh); |
1705 | ||
1706 | if (list_empty(&li->falh)) { | |
2373ce1c | 1707 | hlist_del_rcu(&li->hlist); |
19baf839 RO |
1708 | free_leaf_info(li); |
1709 | } | |
1710 | } | |
1711 | return found; | |
1712 | } | |
1713 | ||
2373ce1c RO |
1714 | /* rcu_read_lock needs to be hold by caller from readside */ |
1715 | ||
19baf839 RO |
1716 | static struct leaf *nextleaf(struct trie *t, struct leaf *thisleaf) |
1717 | { | |
1718 | struct node *c = (struct node *) thisleaf; | |
1719 | struct tnode *p; | |
1720 | int idx; | |
2373ce1c | 1721 | struct node *trie = rcu_dereference(t->trie); |
19baf839 | 1722 | |
c877efb2 | 1723 | if (c == NULL) { |
2373ce1c | 1724 | if (trie == NULL) |
19baf839 RO |
1725 | return NULL; |
1726 | ||
2373ce1c RO |
1727 | if (IS_LEAF(trie)) /* trie w. just a leaf */ |
1728 | return (struct leaf *) trie; | |
19baf839 | 1729 | |
a07f5f50 | 1730 | p = (struct tnode *)trie; /* Start */ |
91b9a277 | 1731 | } else |
b59cfbf7 | 1732 | p = node_parent_rcu(c); |
c877efb2 | 1733 | |
19baf839 RO |
1734 | while (p) { |
1735 | int pos, last; | |
1736 | ||
1737 | /* Find the next child of the parent */ | |
c877efb2 SH |
1738 | if (c) |
1739 | pos = 1 + tkey_extract_bits(c->key, p->pos, p->bits); | |
1740 | else | |
19baf839 RO |
1741 | pos = 0; |
1742 | ||
1743 | last = 1 << p->bits; | |
91b9a277 | 1744 | for (idx = pos; idx < last ; idx++) { |
2373ce1c RO |
1745 | c = rcu_dereference(p->child[idx]); |
1746 | ||
1747 | if (!c) | |
91b9a277 OJ |
1748 | continue; |
1749 | ||
1750 | /* Decend if tnode */ | |
2373ce1c RO |
1751 | while (IS_TNODE(c)) { |
1752 | p = (struct tnode *) c; | |
e905a9ed | 1753 | idx = 0; |
91b9a277 OJ |
1754 | |
1755 | /* Rightmost non-NULL branch */ | |
1756 | if (p && IS_TNODE(p)) | |
2373ce1c RO |
1757 | while (!(c = rcu_dereference(p->child[idx])) |
1758 | && idx < (1<<p->bits)) idx++; | |
91b9a277 OJ |
1759 | |
1760 | /* Done with this tnode? */ | |
2373ce1c | 1761 | if (idx >= (1 << p->bits) || !c) |
91b9a277 | 1762 | goto up; |
19baf839 | 1763 | } |
2373ce1c | 1764 | return (struct leaf *) c; |
19baf839 RO |
1765 | } |
1766 | up: | |
1767 | /* No more children go up one step */ | |
91b9a277 | 1768 | c = (struct node *) p; |
b59cfbf7 | 1769 | p = node_parent_rcu(c); |
19baf839 RO |
1770 | } |
1771 | return NULL; /* Ready. Root of trie */ | |
1772 | } | |
1773 | ||
d562f1f8 RO |
1774 | /* |
1775 | * Caller must hold RTNL. | |
1776 | */ | |
19baf839 RO |
1777 | static int fn_trie_flush(struct fib_table *tb) |
1778 | { | |
1779 | struct trie *t = (struct trie *) tb->tb_data; | |
1780 | struct leaf *ll = NULL, *l = NULL; | |
1781 | int found = 0, h; | |
1782 | ||
91b9a277 | 1783 | for (h = 0; (l = nextleaf(t, l)) != NULL; h++) { |
19baf839 RO |
1784 | found += trie_flush_leaf(t, l); |
1785 | ||
1786 | if (ll && hlist_empty(&ll->list)) | |
1787 | trie_leaf_remove(t, ll->key); | |
1788 | ll = l; | |
1789 | } | |
1790 | ||
1791 | if (ll && hlist_empty(&ll->list)) | |
1792 | trie_leaf_remove(t, ll->key); | |
1793 | ||
0c7770c7 | 1794 | pr_debug("trie_flush found=%d\n", found); |
19baf839 RO |
1795 | return found; |
1796 | } | |
1797 | ||
a07f5f50 SH |
1798 | static void fn_trie_select_default(struct fib_table *tb, |
1799 | const struct flowi *flp, | |
1800 | struct fib_result *res) | |
19baf839 RO |
1801 | { |
1802 | struct trie *t = (struct trie *) tb->tb_data; | |
1803 | int order, last_idx; | |
1804 | struct fib_info *fi = NULL; | |
1805 | struct fib_info *last_resort; | |
1806 | struct fib_alias *fa = NULL; | |
1807 | struct list_head *fa_head; | |
1808 | struct leaf *l; | |
1809 | ||
1810 | last_idx = -1; | |
1811 | last_resort = NULL; | |
1812 | order = -1; | |
1813 | ||
2373ce1c | 1814 | rcu_read_lock(); |
c877efb2 | 1815 | |
19baf839 | 1816 | l = fib_find_node(t, 0); |
c877efb2 | 1817 | if (!l) |
19baf839 RO |
1818 | goto out; |
1819 | ||
1820 | fa_head = get_fa_head(l, 0); | |
c877efb2 | 1821 | if (!fa_head) |
19baf839 RO |
1822 | goto out; |
1823 | ||
c877efb2 | 1824 | if (list_empty(fa_head)) |
19baf839 RO |
1825 | goto out; |
1826 | ||
2373ce1c | 1827 | list_for_each_entry_rcu(fa, fa_head, fa_list) { |
19baf839 | 1828 | struct fib_info *next_fi = fa->fa_info; |
91b9a277 | 1829 | |
19baf839 RO |
1830 | if (fa->fa_scope != res->scope || |
1831 | fa->fa_type != RTN_UNICAST) | |
1832 | continue; | |
91b9a277 | 1833 | |
19baf839 RO |
1834 | if (next_fi->fib_priority > res->fi->fib_priority) |
1835 | break; | |
1836 | if (!next_fi->fib_nh[0].nh_gw || | |
1837 | next_fi->fib_nh[0].nh_scope != RT_SCOPE_LINK) | |
1838 | continue; | |
1839 | fa->fa_state |= FA_S_ACCESSED; | |
91b9a277 | 1840 | |
19baf839 RO |
1841 | if (fi == NULL) { |
1842 | if (next_fi != res->fi) | |
1843 | break; | |
1844 | } else if (!fib_detect_death(fi, order, &last_resort, | |
971b893e | 1845 | &last_idx, tb->tb_default)) { |
a2bbe682 | 1846 | fib_result_assign(res, fi); |
971b893e | 1847 | tb->tb_default = order; |
19baf839 RO |
1848 | goto out; |
1849 | } | |
1850 | fi = next_fi; | |
1851 | order++; | |
1852 | } | |
1853 | if (order <= 0 || fi == NULL) { | |
971b893e | 1854 | tb->tb_default = -1; |
19baf839 RO |
1855 | goto out; |
1856 | } | |
1857 | ||
971b893e DL |
1858 | if (!fib_detect_death(fi, order, &last_resort, &last_idx, |
1859 | tb->tb_default)) { | |
a2bbe682 | 1860 | fib_result_assign(res, fi); |
971b893e | 1861 | tb->tb_default = order; |
19baf839 RO |
1862 | goto out; |
1863 | } | |
a2bbe682 DL |
1864 | if (last_idx >= 0) |
1865 | fib_result_assign(res, last_resort); | |
971b893e DL |
1866 | tb->tb_default = last_idx; |
1867 | out: | |
2373ce1c | 1868 | rcu_read_unlock(); |
19baf839 RO |
1869 | } |
1870 | ||
a07f5f50 SH |
1871 | static int fn_trie_dump_fa(t_key key, int plen, struct list_head *fah, |
1872 | struct fib_table *tb, | |
19baf839 RO |
1873 | struct sk_buff *skb, struct netlink_callback *cb) |
1874 | { | |
1875 | int i, s_i; | |
1876 | struct fib_alias *fa; | |
1877 | ||
32ab5f80 | 1878 | __be32 xkey = htonl(key); |
19baf839 | 1879 | |
1af5a8c4 | 1880 | s_i = cb->args[4]; |
19baf839 RO |
1881 | i = 0; |
1882 | ||
2373ce1c RO |
1883 | /* rcu_read_lock is hold by caller */ |
1884 | ||
1885 | list_for_each_entry_rcu(fa, fah, fa_list) { | |
19baf839 RO |
1886 | if (i < s_i) { |
1887 | i++; | |
1888 | continue; | |
1889 | } | |
78c6671a | 1890 | BUG_ON(!fa->fa_info); |
19baf839 RO |
1891 | |
1892 | if (fib_dump_info(skb, NETLINK_CB(cb->skb).pid, | |
1893 | cb->nlh->nlmsg_seq, | |
1894 | RTM_NEWROUTE, | |
1895 | tb->tb_id, | |
1896 | fa->fa_type, | |
1897 | fa->fa_scope, | |
be403ea1 | 1898 | xkey, |
19baf839 RO |
1899 | plen, |
1900 | fa->fa_tos, | |
64347f78 | 1901 | fa->fa_info, NLM_F_MULTI) < 0) { |
1af5a8c4 | 1902 | cb->args[4] = i; |
19baf839 | 1903 | return -1; |
91b9a277 | 1904 | } |
19baf839 RO |
1905 | i++; |
1906 | } | |
1af5a8c4 | 1907 | cb->args[4] = i; |
19baf839 RO |
1908 | return skb->len; |
1909 | } | |
1910 | ||
a07f5f50 SH |
1911 | static int fn_trie_dump_plen(struct trie *t, int plen, struct fib_table *tb, |
1912 | struct sk_buff *skb, struct netlink_callback *cb) | |
19baf839 RO |
1913 | { |
1914 | int h, s_h; | |
1915 | struct list_head *fa_head; | |
1916 | struct leaf *l = NULL; | |
19baf839 | 1917 | |
1af5a8c4 | 1918 | s_h = cb->args[3]; |
19baf839 | 1919 | |
91b9a277 | 1920 | for (h = 0; (l = nextleaf(t, l)) != NULL; h++) { |
19baf839 RO |
1921 | if (h < s_h) |
1922 | continue; | |
1923 | if (h > s_h) | |
1af5a8c4 PM |
1924 | memset(&cb->args[4], 0, |
1925 | sizeof(cb->args) - 4*sizeof(cb->args[0])); | |
19baf839 RO |
1926 | |
1927 | fa_head = get_fa_head(l, plen); | |
91b9a277 | 1928 | |
c877efb2 | 1929 | if (!fa_head) |
19baf839 RO |
1930 | continue; |
1931 | ||
c877efb2 | 1932 | if (list_empty(fa_head)) |
19baf839 RO |
1933 | continue; |
1934 | ||
a07f5f50 | 1935 | if (fn_trie_dump_fa(l->key, plen, fa_head, tb, skb, cb) < 0) { |
1af5a8c4 | 1936 | cb->args[3] = h; |
19baf839 RO |
1937 | return -1; |
1938 | } | |
1939 | } | |
1af5a8c4 | 1940 | cb->args[3] = h; |
19baf839 RO |
1941 | return skb->len; |
1942 | } | |
1943 | ||
a07f5f50 SH |
1944 | static int fn_trie_dump(struct fib_table *tb, struct sk_buff *skb, |
1945 | struct netlink_callback *cb) | |
19baf839 RO |
1946 | { |
1947 | int m, s_m; | |
1948 | struct trie *t = (struct trie *) tb->tb_data; | |
1949 | ||
1af5a8c4 | 1950 | s_m = cb->args[2]; |
19baf839 | 1951 | |
2373ce1c | 1952 | rcu_read_lock(); |
91b9a277 | 1953 | for (m = 0; m <= 32; m++) { |
19baf839 RO |
1954 | if (m < s_m) |
1955 | continue; | |
1956 | if (m > s_m) | |
1af5a8c4 PM |
1957 | memset(&cb->args[3], 0, |
1958 | sizeof(cb->args) - 3*sizeof(cb->args[0])); | |
19baf839 | 1959 | |
a07f5f50 | 1960 | if (fn_trie_dump_plen(t, 32-m, tb, skb, cb) < 0) { |
1af5a8c4 | 1961 | cb->args[2] = m; |
19baf839 RO |
1962 | goto out; |
1963 | } | |
1964 | } | |
2373ce1c | 1965 | rcu_read_unlock(); |
1af5a8c4 | 1966 | cb->args[2] = m; |
19baf839 | 1967 | return skb->len; |
91b9a277 | 1968 | out: |
2373ce1c | 1969 | rcu_read_unlock(); |
19baf839 RO |
1970 | return -1; |
1971 | } | |
1972 | ||
7f9b8052 SH |
1973 | void __init fib_hash_init(void) |
1974 | { | |
a07f5f50 SH |
1975 | fn_alias_kmem = kmem_cache_create("ip_fib_alias", |
1976 | sizeof(struct fib_alias), | |
bc3c8c1e SH |
1977 | 0, SLAB_PANIC, NULL); |
1978 | ||
1979 | trie_leaf_kmem = kmem_cache_create("ip_fib_trie", | |
1980 | max(sizeof(struct leaf), | |
1981 | sizeof(struct leaf_info)), | |
1982 | 0, SLAB_PANIC, NULL); | |
7f9b8052 | 1983 | } |
19baf839 | 1984 | |
7f9b8052 SH |
1985 | |
1986 | /* Fix more generic FIB names for init later */ | |
1987 | struct fib_table *fib_hash_table(u32 id) | |
19baf839 RO |
1988 | { |
1989 | struct fib_table *tb; | |
1990 | struct trie *t; | |
1991 | ||
19baf839 RO |
1992 | tb = kmalloc(sizeof(struct fib_table) + sizeof(struct trie), |
1993 | GFP_KERNEL); | |
1994 | if (tb == NULL) | |
1995 | return NULL; | |
1996 | ||
1997 | tb->tb_id = id; | |
971b893e | 1998 | tb->tb_default = -1; |
19baf839 RO |
1999 | tb->tb_lookup = fn_trie_lookup; |
2000 | tb->tb_insert = fn_trie_insert; | |
2001 | tb->tb_delete = fn_trie_delete; | |
2002 | tb->tb_flush = fn_trie_flush; | |
2003 | tb->tb_select_default = fn_trie_select_default; | |
2004 | tb->tb_dump = fn_trie_dump; | |
19baf839 RO |
2005 | |
2006 | t = (struct trie *) tb->tb_data; | |
c28a1cf4 | 2007 | memset(t, 0, sizeof(*t)); |
19baf839 | 2008 | |
19baf839 | 2009 | if (id == RT_TABLE_LOCAL) |
a07f5f50 | 2010 | pr_info("IPv4 FIB: Using LC-trie version %s\n", VERSION); |
19baf839 RO |
2011 | |
2012 | return tb; | |
2013 | } | |
2014 | ||
cb7b593c SH |
2015 | #ifdef CONFIG_PROC_FS |
2016 | /* Depth first Trie walk iterator */ | |
2017 | struct fib_trie_iter { | |
1c340b2f | 2018 | struct seq_net_private p; |
877a9bff | 2019 | struct trie *trie_local, *trie_main; |
cb7b593c SH |
2020 | struct tnode *tnode; |
2021 | struct trie *trie; | |
2022 | unsigned index; | |
2023 | unsigned depth; | |
2024 | }; | |
19baf839 | 2025 | |
cb7b593c | 2026 | static struct node *fib_trie_get_next(struct fib_trie_iter *iter) |
19baf839 | 2027 | { |
cb7b593c SH |
2028 | struct tnode *tn = iter->tnode; |
2029 | unsigned cindex = iter->index; | |
2030 | struct tnode *p; | |
19baf839 | 2031 | |
6640e697 EB |
2032 | /* A single entry routing table */ |
2033 | if (!tn) | |
2034 | return NULL; | |
2035 | ||
cb7b593c SH |
2036 | pr_debug("get_next iter={node=%p index=%d depth=%d}\n", |
2037 | iter->tnode, iter->index, iter->depth); | |
2038 | rescan: | |
2039 | while (cindex < (1<<tn->bits)) { | |
b59cfbf7 | 2040 | struct node *n = tnode_get_child_rcu(tn, cindex); |
19baf839 | 2041 | |
cb7b593c SH |
2042 | if (n) { |
2043 | if (IS_LEAF(n)) { | |
2044 | iter->tnode = tn; | |
2045 | iter->index = cindex + 1; | |
2046 | } else { | |
2047 | /* push down one level */ | |
2048 | iter->tnode = (struct tnode *) n; | |
2049 | iter->index = 0; | |
2050 | ++iter->depth; | |
2051 | } | |
2052 | return n; | |
2053 | } | |
19baf839 | 2054 | |
cb7b593c SH |
2055 | ++cindex; |
2056 | } | |
91b9a277 | 2057 | |
cb7b593c | 2058 | /* Current node exhausted, pop back up */ |
b59cfbf7 | 2059 | p = node_parent_rcu((struct node *)tn); |
cb7b593c SH |
2060 | if (p) { |
2061 | cindex = tkey_extract_bits(tn->key, p->pos, p->bits)+1; | |
2062 | tn = p; | |
2063 | --iter->depth; | |
2064 | goto rescan; | |
19baf839 | 2065 | } |
cb7b593c SH |
2066 | |
2067 | /* got root? */ | |
2068 | return NULL; | |
19baf839 RO |
2069 | } |
2070 | ||
cb7b593c SH |
2071 | static struct node *fib_trie_get_first(struct fib_trie_iter *iter, |
2072 | struct trie *t) | |
19baf839 | 2073 | { |
5ddf0eb2 RO |
2074 | struct node *n ; |
2075 | ||
132adf54 | 2076 | if (!t) |
5ddf0eb2 RO |
2077 | return NULL; |
2078 | ||
2079 | n = rcu_dereference(t->trie); | |
2080 | ||
132adf54 | 2081 | if (!iter) |
5ddf0eb2 | 2082 | return NULL; |
19baf839 | 2083 | |
6640e697 EB |
2084 | if (n) { |
2085 | if (IS_TNODE(n)) { | |
2086 | iter->tnode = (struct tnode *) n; | |
2087 | iter->trie = t; | |
2088 | iter->index = 0; | |
2089 | iter->depth = 1; | |
2090 | } else { | |
2091 | iter->tnode = NULL; | |
2092 | iter->trie = t; | |
2093 | iter->index = 0; | |
2094 | iter->depth = 0; | |
2095 | } | |
cb7b593c | 2096 | return n; |
91b9a277 | 2097 | } |
cb7b593c SH |
2098 | return NULL; |
2099 | } | |
91b9a277 | 2100 | |
cb7b593c SH |
2101 | static void trie_collect_stats(struct trie *t, struct trie_stat *s) |
2102 | { | |
2103 | struct node *n; | |
2104 | struct fib_trie_iter iter; | |
91b9a277 | 2105 | |
cb7b593c | 2106 | memset(s, 0, sizeof(*s)); |
91b9a277 | 2107 | |
cb7b593c SH |
2108 | rcu_read_lock(); |
2109 | for (n = fib_trie_get_first(&iter, t); n; | |
2110 | n = fib_trie_get_next(&iter)) { | |
2111 | if (IS_LEAF(n)) { | |
93672292 SH |
2112 | struct leaf *l = (struct leaf *)n; |
2113 | struct leaf_info *li; | |
2114 | struct hlist_node *tmp; | |
2115 | ||
cb7b593c SH |
2116 | s->leaves++; |
2117 | s->totdepth += iter.depth; | |
2118 | if (iter.depth > s->maxdepth) | |
2119 | s->maxdepth = iter.depth; | |
93672292 SH |
2120 | |
2121 | hlist_for_each_entry_rcu(li, tmp, &l->list, hlist) | |
2122 | ++s->prefixes; | |
cb7b593c SH |
2123 | } else { |
2124 | const struct tnode *tn = (const struct tnode *) n; | |
2125 | int i; | |
2126 | ||
2127 | s->tnodes++; | |
132adf54 | 2128 | if (tn->bits < MAX_STAT_DEPTH) |
06ef921d RO |
2129 | s->nodesizes[tn->bits]++; |
2130 | ||
cb7b593c SH |
2131 | for (i = 0; i < (1<<tn->bits); i++) |
2132 | if (!tn->child[i]) | |
2133 | s->nullpointers++; | |
19baf839 | 2134 | } |
19baf839 | 2135 | } |
2373ce1c | 2136 | rcu_read_unlock(); |
19baf839 RO |
2137 | } |
2138 | ||
cb7b593c SH |
2139 | /* |
2140 | * This outputs /proc/net/fib_triestats | |
2141 | */ | |
2142 | static void trie_show_stats(struct seq_file *seq, struct trie_stat *stat) | |
19baf839 | 2143 | { |
cb7b593c | 2144 | unsigned i, max, pointers, bytes, avdepth; |
c877efb2 | 2145 | |
cb7b593c SH |
2146 | if (stat->leaves) |
2147 | avdepth = stat->totdepth*100 / stat->leaves; | |
2148 | else | |
2149 | avdepth = 0; | |
91b9a277 | 2150 | |
a07f5f50 SH |
2151 | seq_printf(seq, "\tAver depth: %u.%02d\n", |
2152 | avdepth / 100, avdepth % 100); | |
cb7b593c | 2153 | seq_printf(seq, "\tMax depth: %u\n", stat->maxdepth); |
91b9a277 | 2154 | |
cb7b593c | 2155 | seq_printf(seq, "\tLeaves: %u\n", stat->leaves); |
cb7b593c | 2156 | bytes = sizeof(struct leaf) * stat->leaves; |
93672292 SH |
2157 | |
2158 | seq_printf(seq, "\tPrefixes: %u\n", stat->prefixes); | |
2159 | bytes += sizeof(struct leaf_info) * stat->prefixes; | |
2160 | ||
187b5188 | 2161 | seq_printf(seq, "\tInternal nodes: %u\n\t", stat->tnodes); |
cb7b593c | 2162 | bytes += sizeof(struct tnode) * stat->tnodes; |
19baf839 | 2163 | |
06ef921d RO |
2164 | max = MAX_STAT_DEPTH; |
2165 | while (max > 0 && stat->nodesizes[max-1] == 0) | |
cb7b593c | 2166 | max--; |
19baf839 | 2167 | |
cb7b593c SH |
2168 | pointers = 0; |
2169 | for (i = 1; i <= max; i++) | |
2170 | if (stat->nodesizes[i] != 0) { | |
187b5188 | 2171 | seq_printf(seq, " %u: %u", i, stat->nodesizes[i]); |
cb7b593c SH |
2172 | pointers += (1<<i) * stat->nodesizes[i]; |
2173 | } | |
2174 | seq_putc(seq, '\n'); | |
187b5188 | 2175 | seq_printf(seq, "\tPointers: %u\n", pointers); |
2373ce1c | 2176 | |
cb7b593c | 2177 | bytes += sizeof(struct node *) * pointers; |
187b5188 SH |
2178 | seq_printf(seq, "Null ptrs: %u\n", stat->nullpointers); |
2179 | seq_printf(seq, "Total size: %u kB\n", (bytes + 1023) / 1024); | |
66a2f7fd | 2180 | } |
2373ce1c | 2181 | |
cb7b593c | 2182 | #ifdef CONFIG_IP_FIB_TRIE_STATS |
66a2f7fd SH |
2183 | static void trie_show_usage(struct seq_file *seq, |
2184 | const struct trie_use_stats *stats) | |
2185 | { | |
2186 | seq_printf(seq, "\nCounters:\n---------\n"); | |
a07f5f50 SH |
2187 | seq_printf(seq, "gets = %u\n", stats->gets); |
2188 | seq_printf(seq, "backtracks = %u\n", stats->backtrack); | |
2189 | seq_printf(seq, "semantic match passed = %u\n", | |
2190 | stats->semantic_match_passed); | |
2191 | seq_printf(seq, "semantic match miss = %u\n", | |
2192 | stats->semantic_match_miss); | |
2193 | seq_printf(seq, "null node hit= %u\n", stats->null_node_hit); | |
2194 | seq_printf(seq, "skipped node resize = %u\n\n", | |
2195 | stats->resize_node_skipped); | |
cb7b593c | 2196 | } |
66a2f7fd SH |
2197 | #endif /* CONFIG_IP_FIB_TRIE_STATS */ |
2198 | ||
a07f5f50 SH |
2199 | static void fib_trie_show(struct seq_file *seq, const char *name, |
2200 | struct trie *trie) | |
d717a9a6 SH |
2201 | { |
2202 | struct trie_stat stat; | |
2203 | ||
d717a9a6 | 2204 | trie_collect_stats(trie, &stat); |
93672292 | 2205 | seq_printf(seq, "%s:\n", name); |
d717a9a6 SH |
2206 | trie_show_stats(seq, &stat); |
2207 | #ifdef CONFIG_IP_FIB_TRIE_STATS | |
2208 | trie_show_usage(seq, &trie->stats); | |
2209 | #endif | |
2210 | } | |
19baf839 | 2211 | |
cb7b593c SH |
2212 | static int fib_triestat_seq_show(struct seq_file *seq, void *v) |
2213 | { | |
1c340b2f | 2214 | struct net *net = (struct net *)seq->private; |
877a9bff EB |
2215 | struct fib_table *tb; |
2216 | ||
d717a9a6 | 2217 | seq_printf(seq, |
a07f5f50 SH |
2218 | "Basic info: size of leaf:" |
2219 | " %Zd bytes, size of tnode: %Zd bytes.\n", | |
d717a9a6 SH |
2220 | sizeof(struct leaf), sizeof(struct tnode)); |
2221 | ||
1c340b2f | 2222 | tb = fib_get_table(net, RT_TABLE_LOCAL); |
877a9bff | 2223 | if (tb) |
d717a9a6 | 2224 | fib_trie_show(seq, "Local", (struct trie *) tb->tb_data); |
877a9bff | 2225 | |
1c340b2f | 2226 | tb = fib_get_table(net, RT_TABLE_MAIN); |
877a9bff | 2227 | if (tb) |
d717a9a6 | 2228 | fib_trie_show(seq, "Main", (struct trie *) tb->tb_data); |
19baf839 | 2229 | |
cb7b593c | 2230 | return 0; |
19baf839 RO |
2231 | } |
2232 | ||
cb7b593c | 2233 | static int fib_triestat_seq_open(struct inode *inode, struct file *file) |
19baf839 | 2234 | { |
1c340b2f DL |
2235 | int err; |
2236 | struct net *net; | |
2237 | ||
2238 | net = get_proc_net(inode); | |
2239 | if (net == NULL) | |
2240 | return -ENXIO; | |
2241 | err = single_open(file, fib_triestat_seq_show, net); | |
2242 | if (err < 0) { | |
2243 | put_net(net); | |
2244 | return err; | |
2245 | } | |
2246 | return 0; | |
2247 | } | |
2248 | ||
2249 | static int fib_triestat_seq_release(struct inode *ino, struct file *f) | |
2250 | { | |
2251 | struct seq_file *seq = f->private_data; | |
2252 | put_net(seq->private); | |
2253 | return single_release(ino, f); | |
19baf839 RO |
2254 | } |
2255 | ||
9a32144e | 2256 | static const struct file_operations fib_triestat_fops = { |
cb7b593c SH |
2257 | .owner = THIS_MODULE, |
2258 | .open = fib_triestat_seq_open, | |
2259 | .read = seq_read, | |
2260 | .llseek = seq_lseek, | |
1c340b2f | 2261 | .release = fib_triestat_seq_release, |
cb7b593c SH |
2262 | }; |
2263 | ||
2264 | static struct node *fib_trie_get_idx(struct fib_trie_iter *iter, | |
2265 | loff_t pos) | |
19baf839 | 2266 | { |
cb7b593c SH |
2267 | loff_t idx = 0; |
2268 | struct node *n; | |
2269 | ||
877a9bff | 2270 | for (n = fib_trie_get_first(iter, iter->trie_local); |
cb7b593c SH |
2271 | n; ++idx, n = fib_trie_get_next(iter)) { |
2272 | if (pos == idx) | |
2273 | return n; | |
2274 | } | |
2275 | ||
877a9bff | 2276 | for (n = fib_trie_get_first(iter, iter->trie_main); |
cb7b593c SH |
2277 | n; ++idx, n = fib_trie_get_next(iter)) { |
2278 | if (pos == idx) | |
2279 | return n; | |
2280 | } | |
19baf839 RO |
2281 | return NULL; |
2282 | } | |
2283 | ||
cb7b593c | 2284 | static void *fib_trie_seq_start(struct seq_file *seq, loff_t *pos) |
c95aaf9a | 2285 | __acquires(RCU) |
19baf839 | 2286 | { |
877a9bff EB |
2287 | struct fib_trie_iter *iter = seq->private; |
2288 | struct fib_table *tb; | |
2289 | ||
2290 | if (!iter->trie_local) { | |
1c340b2f | 2291 | tb = fib_get_table(iter->p.net, RT_TABLE_LOCAL); |
877a9bff EB |
2292 | if (tb) |
2293 | iter->trie_local = (struct trie *) tb->tb_data; | |
2294 | } | |
2295 | if (!iter->trie_main) { | |
1c340b2f | 2296 | tb = fib_get_table(iter->p.net, RT_TABLE_MAIN); |
877a9bff EB |
2297 | if (tb) |
2298 | iter->trie_main = (struct trie *) tb->tb_data; | |
2299 | } | |
cb7b593c SH |
2300 | rcu_read_lock(); |
2301 | if (*pos == 0) | |
91b9a277 | 2302 | return SEQ_START_TOKEN; |
877a9bff | 2303 | return fib_trie_get_idx(iter, *pos - 1); |
19baf839 RO |
2304 | } |
2305 | ||
cb7b593c | 2306 | static void *fib_trie_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
19baf839 | 2307 | { |
cb7b593c SH |
2308 | struct fib_trie_iter *iter = seq->private; |
2309 | void *l = v; | |
2310 | ||
19baf839 | 2311 | ++*pos; |
91b9a277 | 2312 | if (v == SEQ_START_TOKEN) |
cb7b593c | 2313 | return fib_trie_get_idx(iter, 0); |
19baf839 | 2314 | |
cb7b593c SH |
2315 | v = fib_trie_get_next(iter); |
2316 | BUG_ON(v == l); | |
2317 | if (v) | |
2318 | return v; | |
19baf839 | 2319 | |
cb7b593c | 2320 | /* continue scan in next trie */ |
877a9bff EB |
2321 | if (iter->trie == iter->trie_local) |
2322 | return fib_trie_get_first(iter, iter->trie_main); | |
19baf839 | 2323 | |
cb7b593c SH |
2324 | return NULL; |
2325 | } | |
19baf839 | 2326 | |
cb7b593c | 2327 | static void fib_trie_seq_stop(struct seq_file *seq, void *v) |
c95aaf9a | 2328 | __releases(RCU) |
19baf839 | 2329 | { |
cb7b593c SH |
2330 | rcu_read_unlock(); |
2331 | } | |
91b9a277 | 2332 | |
cb7b593c SH |
2333 | static void seq_indent(struct seq_file *seq, int n) |
2334 | { | |
2335 | while (n-- > 0) seq_puts(seq, " "); | |
2336 | } | |
19baf839 | 2337 | |
28d36e37 | 2338 | static inline const char *rtn_scope(char *buf, size_t len, enum rt_scope_t s) |
cb7b593c | 2339 | { |
132adf54 | 2340 | switch (s) { |
cb7b593c SH |
2341 | case RT_SCOPE_UNIVERSE: return "universe"; |
2342 | case RT_SCOPE_SITE: return "site"; | |
2343 | case RT_SCOPE_LINK: return "link"; | |
2344 | case RT_SCOPE_HOST: return "host"; | |
2345 | case RT_SCOPE_NOWHERE: return "nowhere"; | |
2346 | default: | |
28d36e37 | 2347 | snprintf(buf, len, "scope=%d", s); |
cb7b593c SH |
2348 | return buf; |
2349 | } | |
2350 | } | |
19baf839 | 2351 | |
cb7b593c SH |
2352 | static const char *rtn_type_names[__RTN_MAX] = { |
2353 | [RTN_UNSPEC] = "UNSPEC", | |
2354 | [RTN_UNICAST] = "UNICAST", | |
2355 | [RTN_LOCAL] = "LOCAL", | |
2356 | [RTN_BROADCAST] = "BROADCAST", | |
2357 | [RTN_ANYCAST] = "ANYCAST", | |
2358 | [RTN_MULTICAST] = "MULTICAST", | |
2359 | [RTN_BLACKHOLE] = "BLACKHOLE", | |
2360 | [RTN_UNREACHABLE] = "UNREACHABLE", | |
2361 | [RTN_PROHIBIT] = "PROHIBIT", | |
2362 | [RTN_THROW] = "THROW", | |
2363 | [RTN_NAT] = "NAT", | |
2364 | [RTN_XRESOLVE] = "XRESOLVE", | |
2365 | }; | |
19baf839 | 2366 | |
28d36e37 | 2367 | static inline const char *rtn_type(char *buf, size_t len, unsigned t) |
cb7b593c | 2368 | { |
cb7b593c SH |
2369 | if (t < __RTN_MAX && rtn_type_names[t]) |
2370 | return rtn_type_names[t]; | |
28d36e37 | 2371 | snprintf(buf, len, "type %u", t); |
cb7b593c | 2372 | return buf; |
19baf839 RO |
2373 | } |
2374 | ||
cb7b593c SH |
2375 | /* Pretty print the trie */ |
2376 | static int fib_trie_seq_show(struct seq_file *seq, void *v) | |
19baf839 | 2377 | { |
cb7b593c SH |
2378 | const struct fib_trie_iter *iter = seq->private; |
2379 | struct node *n = v; | |
c877efb2 | 2380 | |
cb7b593c SH |
2381 | if (v == SEQ_START_TOKEN) |
2382 | return 0; | |
19baf839 | 2383 | |
b59cfbf7 | 2384 | if (!node_parent_rcu(n)) { |
877a9bff | 2385 | if (iter->trie == iter->trie_local) |
095b8501 RO |
2386 | seq_puts(seq, "<local>:\n"); |
2387 | else | |
2388 | seq_puts(seq, "<main>:\n"); | |
2389 | } | |
2390 | ||
cb7b593c SH |
2391 | if (IS_TNODE(n)) { |
2392 | struct tnode *tn = (struct tnode *) n; | |
ab66b4a7 | 2393 | __be32 prf = htonl(mask_pfx(tn->key, tn->pos)); |
91b9a277 | 2394 | |
1d25cd6c RO |
2395 | seq_indent(seq, iter->depth-1); |
2396 | seq_printf(seq, " +-- %d.%d.%d.%d/%d %d %d %d\n", | |
e905a9ed | 2397 | NIPQUAD(prf), tn->pos, tn->bits, tn->full_children, |
1d25cd6c | 2398 | tn->empty_children); |
e905a9ed | 2399 | |
cb7b593c SH |
2400 | } else { |
2401 | struct leaf *l = (struct leaf *) n; | |
1328042e SH |
2402 | struct leaf_info *li; |
2403 | struct hlist_node *node; | |
2404 | ||
32ab5f80 | 2405 | __be32 val = htonl(l->key); |
cb7b593c SH |
2406 | |
2407 | seq_indent(seq, iter->depth); | |
2408 | seq_printf(seq, " |-- %d.%d.%d.%d\n", NIPQUAD(val)); | |
1328042e SH |
2409 | |
2410 | hlist_for_each_entry_rcu(li, node, &l->list, hlist) { | |
2411 | struct fib_alias *fa; | |
2412 | ||
2413 | list_for_each_entry_rcu(fa, &li->falh, fa_list) { | |
2414 | char buf1[32], buf2[32]; | |
2415 | ||
2416 | seq_indent(seq, iter->depth+1); | |
2417 | seq_printf(seq, " /%d %s %s", li->plen, | |
2418 | rtn_scope(buf1, sizeof(buf1), | |
2419 | fa->fa_scope), | |
2420 | rtn_type(buf2, sizeof(buf2), | |
2421 | fa->fa_type)); | |
2422 | if (fa->fa_tos) | |
2423 | seq_printf(seq, "tos =%d\n", | |
2424 | fa->fa_tos); | |
2425 | seq_putc(seq, '\n'); | |
cb7b593c SH |
2426 | } |
2427 | } | |
19baf839 | 2428 | } |
cb7b593c | 2429 | |
19baf839 RO |
2430 | return 0; |
2431 | } | |
2432 | ||
f690808e | 2433 | static const struct seq_operations fib_trie_seq_ops = { |
cb7b593c SH |
2434 | .start = fib_trie_seq_start, |
2435 | .next = fib_trie_seq_next, | |
2436 | .stop = fib_trie_seq_stop, | |
2437 | .show = fib_trie_seq_show, | |
19baf839 RO |
2438 | }; |
2439 | ||
cb7b593c | 2440 | static int fib_trie_seq_open(struct inode *inode, struct file *file) |
19baf839 | 2441 | { |
1c340b2f DL |
2442 | return seq_open_net(inode, file, &fib_trie_seq_ops, |
2443 | sizeof(struct fib_trie_iter)); | |
19baf839 RO |
2444 | } |
2445 | ||
9a32144e | 2446 | static const struct file_operations fib_trie_fops = { |
cb7b593c SH |
2447 | .owner = THIS_MODULE, |
2448 | .open = fib_trie_seq_open, | |
2449 | .read = seq_read, | |
2450 | .llseek = seq_lseek, | |
1c340b2f | 2451 | .release = seq_release_net, |
19baf839 RO |
2452 | }; |
2453 | ||
32ab5f80 | 2454 | static unsigned fib_flag_trans(int type, __be32 mask, const struct fib_info *fi) |
19baf839 | 2455 | { |
cb7b593c SH |
2456 | static unsigned type2flags[RTN_MAX + 1] = { |
2457 | [7] = RTF_REJECT, [8] = RTF_REJECT, | |
2458 | }; | |
2459 | unsigned flags = type2flags[type]; | |
19baf839 | 2460 | |
cb7b593c SH |
2461 | if (fi && fi->fib_nh->nh_gw) |
2462 | flags |= RTF_GATEWAY; | |
32ab5f80 | 2463 | if (mask == htonl(0xFFFFFFFF)) |
cb7b593c SH |
2464 | flags |= RTF_HOST; |
2465 | flags |= RTF_UP; | |
2466 | return flags; | |
19baf839 RO |
2467 | } |
2468 | ||
cb7b593c SH |
2469 | /* |
2470 | * This outputs /proc/net/route. | |
2471 | * The format of the file is not supposed to be changed | |
2472 | * and needs to be same as fib_hash output to avoid breaking | |
2473 | * legacy utilities | |
2474 | */ | |
2475 | static int fib_route_seq_show(struct seq_file *seq, void *v) | |
19baf839 | 2476 | { |
c9e53cbe | 2477 | const struct fib_trie_iter *iter = seq->private; |
cb7b593c | 2478 | struct leaf *l = v; |
1328042e SH |
2479 | struct leaf_info *li; |
2480 | struct hlist_node *node; | |
19baf839 | 2481 | |
cb7b593c SH |
2482 | if (v == SEQ_START_TOKEN) { |
2483 | seq_printf(seq, "%-127s\n", "Iface\tDestination\tGateway " | |
2484 | "\tFlags\tRefCnt\tUse\tMetric\tMask\t\tMTU" | |
2485 | "\tWindow\tIRTT"); | |
2486 | return 0; | |
2487 | } | |
19baf839 | 2488 | |
877a9bff | 2489 | if (iter->trie == iter->trie_local) |
c9e53cbe | 2490 | return 0; |
a07f5f50 | 2491 | |
cb7b593c SH |
2492 | if (IS_TNODE(l)) |
2493 | return 0; | |
19baf839 | 2494 | |
1328042e | 2495 | hlist_for_each_entry_rcu(li, node, &l->list, hlist) { |
cb7b593c | 2496 | struct fib_alias *fa; |
32ab5f80 | 2497 | __be32 mask, prefix; |
91b9a277 | 2498 | |
cb7b593c SH |
2499 | if (!li) |
2500 | continue; | |
19baf839 | 2501 | |
cb7b593c SH |
2502 | mask = inet_make_mask(li->plen); |
2503 | prefix = htonl(l->key); | |
19baf839 | 2504 | |
cb7b593c | 2505 | list_for_each_entry_rcu(fa, &li->falh, fa_list) { |
1371e37d | 2506 | const struct fib_info *fi = fa->fa_info; |
cb7b593c | 2507 | unsigned flags = fib_flag_trans(fa->fa_type, mask, fi); |
1328042e | 2508 | char bf[128]; |
19baf839 | 2509 | |
cb7b593c SH |
2510 | if (fa->fa_type == RTN_BROADCAST |
2511 | || fa->fa_type == RTN_MULTICAST) | |
2512 | continue; | |
19baf839 | 2513 | |
cb7b593c SH |
2514 | if (fi) |
2515 | snprintf(bf, sizeof(bf), | |
2516 | "%s\t%08X\t%08X\t%04X\t%d\t%u\t%d\t%08X\t%d\t%u\t%u", | |
2517 | fi->fib_dev ? fi->fib_dev->name : "*", | |
2518 | prefix, | |
2519 | fi->fib_nh->nh_gw, flags, 0, 0, | |
2520 | fi->fib_priority, | |
2521 | mask, | |
a07f5f50 SH |
2522 | (fi->fib_advmss ? |
2523 | fi->fib_advmss + 40 : 0), | |
cb7b593c SH |
2524 | fi->fib_window, |
2525 | fi->fib_rtt >> 3); | |
2526 | else | |
2527 | snprintf(bf, sizeof(bf), | |
2528 | "*\t%08X\t%08X\t%04X\t%d\t%u\t%d\t%08X\t%d\t%u\t%u", | |
2529 | prefix, 0, flags, 0, 0, 0, | |
2530 | mask, 0, 0, 0); | |
19baf839 | 2531 | |
cb7b593c SH |
2532 | seq_printf(seq, "%-127s\n", bf); |
2533 | } | |
19baf839 RO |
2534 | } |
2535 | ||
2536 | return 0; | |
2537 | } | |
2538 | ||
f690808e | 2539 | static const struct seq_operations fib_route_seq_ops = { |
cb7b593c SH |
2540 | .start = fib_trie_seq_start, |
2541 | .next = fib_trie_seq_next, | |
2542 | .stop = fib_trie_seq_stop, | |
2543 | .show = fib_route_seq_show, | |
19baf839 RO |
2544 | }; |
2545 | ||
cb7b593c | 2546 | static int fib_route_seq_open(struct inode *inode, struct file *file) |
19baf839 | 2547 | { |
1c340b2f DL |
2548 | return seq_open_net(inode, file, &fib_route_seq_ops, |
2549 | sizeof(struct fib_trie_iter)); | |
19baf839 RO |
2550 | } |
2551 | ||
9a32144e | 2552 | static const struct file_operations fib_route_fops = { |
cb7b593c SH |
2553 | .owner = THIS_MODULE, |
2554 | .open = fib_route_seq_open, | |
2555 | .read = seq_read, | |
2556 | .llseek = seq_lseek, | |
1c340b2f | 2557 | .release = seq_release_net, |
19baf839 RO |
2558 | }; |
2559 | ||
61a02653 | 2560 | int __net_init fib_proc_init(struct net *net) |
19baf839 | 2561 | { |
61a02653 | 2562 | if (!proc_net_fops_create(net, "fib_trie", S_IRUGO, &fib_trie_fops)) |
cb7b593c SH |
2563 | goto out1; |
2564 | ||
61a02653 DL |
2565 | if (!proc_net_fops_create(net, "fib_triestat", S_IRUGO, |
2566 | &fib_triestat_fops)) | |
cb7b593c SH |
2567 | goto out2; |
2568 | ||
61a02653 | 2569 | if (!proc_net_fops_create(net, "route", S_IRUGO, &fib_route_fops)) |
cb7b593c SH |
2570 | goto out3; |
2571 | ||
19baf839 | 2572 | return 0; |
cb7b593c SH |
2573 | |
2574 | out3: | |
61a02653 | 2575 | proc_net_remove(net, "fib_triestat"); |
cb7b593c | 2576 | out2: |
61a02653 | 2577 | proc_net_remove(net, "fib_trie"); |
cb7b593c SH |
2578 | out1: |
2579 | return -ENOMEM; | |
19baf839 RO |
2580 | } |
2581 | ||
61a02653 | 2582 | void __net_exit fib_proc_exit(struct net *net) |
19baf839 | 2583 | { |
61a02653 DL |
2584 | proc_net_remove(net, "fib_trie"); |
2585 | proc_net_remove(net, "fib_triestat"); | |
2586 | proc_net_remove(net, "route"); | |
19baf839 RO |
2587 | } |
2588 | ||
2589 | #endif /* CONFIG_PROC_FS */ |