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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. | |
631dd1a8 | 19 | * http://www.csc.kth.se/~snilsson/software/dyntrie2/ |
19baf839 RO |
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 | * | |
19baf839 RO |
25 | * |
26 | * Code from fib_hash has been reused which includes the following header: | |
27 | * | |
28 | * | |
29 | * INET An implementation of the TCP/IP protocol suite for the LINUX | |
30 | * operating system. INET is implemented using the BSD Socket | |
31 | * interface as the means of communication with the user level. | |
32 | * | |
33 | * IPv4 FIB: lookup engine and maintenance routines. | |
34 | * | |
35 | * | |
36 | * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> | |
37 | * | |
38 | * This program is free software; you can redistribute it and/or | |
39 | * modify it under the terms of the GNU General Public License | |
40 | * as published by the Free Software Foundation; either version | |
41 | * 2 of the License, or (at your option) any later version. | |
fd966255 RO |
42 | * |
43 | * Substantial contributions to this work comes from: | |
44 | * | |
45 | * David S. Miller, <davem@davemloft.net> | |
46 | * Stephen Hemminger <shemminger@osdl.org> | |
47 | * Paul E. McKenney <paulmck@us.ibm.com> | |
48 | * Patrick McHardy <kaber@trash.net> | |
19baf839 RO |
49 | */ |
50 | ||
80b71b80 | 51 | #define VERSION "0.409" |
19baf839 | 52 | |
19baf839 RO |
53 | #include <asm/uaccess.h> |
54 | #include <asm/system.h> | |
1977f032 | 55 | #include <linux/bitops.h> |
19baf839 RO |
56 | #include <linux/types.h> |
57 | #include <linux/kernel.h> | |
19baf839 RO |
58 | #include <linux/mm.h> |
59 | #include <linux/string.h> | |
60 | #include <linux/socket.h> | |
61 | #include <linux/sockios.h> | |
62 | #include <linux/errno.h> | |
63 | #include <linux/in.h> | |
64 | #include <linux/inet.h> | |
cd8787ab | 65 | #include <linux/inetdevice.h> |
19baf839 RO |
66 | #include <linux/netdevice.h> |
67 | #include <linux/if_arp.h> | |
68 | #include <linux/proc_fs.h> | |
2373ce1c | 69 | #include <linux/rcupdate.h> |
19baf839 RO |
70 | #include <linux/skbuff.h> |
71 | #include <linux/netlink.h> | |
72 | #include <linux/init.h> | |
73 | #include <linux/list.h> | |
5a0e3ad6 | 74 | #include <linux/slab.h> |
457c4cbc | 75 | #include <net/net_namespace.h> |
19baf839 RO |
76 | #include <net/ip.h> |
77 | #include <net/protocol.h> | |
78 | #include <net/route.h> | |
79 | #include <net/tcp.h> | |
80 | #include <net/sock.h> | |
81 | #include <net/ip_fib.h> | |
82 | #include "fib_lookup.h" | |
83 | ||
06ef921d | 84 | #define MAX_STAT_DEPTH 32 |
19baf839 | 85 | |
19baf839 | 86 | #define KEYLENGTH (8*sizeof(t_key)) |
19baf839 | 87 | |
19baf839 RO |
88 | typedef unsigned int t_key; |
89 | ||
90 | #define T_TNODE 0 | |
91 | #define T_LEAF 1 | |
92 | #define NODE_TYPE_MASK 0x1UL | |
2373ce1c RO |
93 | #define NODE_TYPE(node) ((node)->parent & NODE_TYPE_MASK) |
94 | ||
91b9a277 OJ |
95 | #define IS_TNODE(n) (!(n->parent & T_LEAF)) |
96 | #define IS_LEAF(n) (n->parent & T_LEAF) | |
19baf839 RO |
97 | |
98 | struct node { | |
91b9a277 | 99 | unsigned long parent; |
8d965444 | 100 | t_key key; |
19baf839 RO |
101 | }; |
102 | ||
103 | struct leaf { | |
91b9a277 | 104 | unsigned long parent; |
8d965444 | 105 | t_key key; |
19baf839 | 106 | struct hlist_head list; |
2373ce1c | 107 | struct rcu_head rcu; |
19baf839 RO |
108 | }; |
109 | ||
110 | struct leaf_info { | |
111 | struct hlist_node hlist; | |
2373ce1c | 112 | struct rcu_head rcu; |
19baf839 RO |
113 | int plen; |
114 | struct list_head falh; | |
115 | }; | |
116 | ||
117 | struct tnode { | |
91b9a277 | 118 | unsigned long parent; |
8d965444 | 119 | t_key key; |
112d8cfc ED |
120 | unsigned char pos; /* 2log(KEYLENGTH) bits needed */ |
121 | unsigned char bits; /* 2log(KEYLENGTH) bits needed */ | |
8d965444 ED |
122 | unsigned int full_children; /* KEYLENGTH bits needed */ |
123 | unsigned int empty_children; /* KEYLENGTH bits needed */ | |
15be75cd SH |
124 | union { |
125 | struct rcu_head rcu; | |
126 | struct work_struct work; | |
e0f7cb8c | 127 | struct tnode *tnode_free; |
15be75cd | 128 | }; |
91b9a277 | 129 | struct node *child[0]; |
19baf839 RO |
130 | }; |
131 | ||
132 | #ifdef CONFIG_IP_FIB_TRIE_STATS | |
133 | struct trie_use_stats { | |
134 | unsigned int gets; | |
135 | unsigned int backtrack; | |
136 | unsigned int semantic_match_passed; | |
137 | unsigned int semantic_match_miss; | |
138 | unsigned int null_node_hit; | |
2f36895a | 139 | unsigned int resize_node_skipped; |
19baf839 RO |
140 | }; |
141 | #endif | |
142 | ||
143 | struct trie_stat { | |
144 | unsigned int totdepth; | |
145 | unsigned int maxdepth; | |
146 | unsigned int tnodes; | |
147 | unsigned int leaves; | |
148 | unsigned int nullpointers; | |
93672292 | 149 | unsigned int prefixes; |
06ef921d | 150 | unsigned int nodesizes[MAX_STAT_DEPTH]; |
c877efb2 | 151 | }; |
19baf839 RO |
152 | |
153 | struct trie { | |
91b9a277 | 154 | struct node *trie; |
19baf839 RO |
155 | #ifdef CONFIG_IP_FIB_TRIE_STATS |
156 | struct trie_use_stats stats; | |
157 | #endif | |
19baf839 RO |
158 | }; |
159 | ||
19baf839 | 160 | static void put_child(struct trie *t, struct tnode *tn, int i, struct node *n); |
a07f5f50 SH |
161 | static void tnode_put_child_reorg(struct tnode *tn, int i, struct node *n, |
162 | int wasfull); | |
19baf839 | 163 | static struct node *resize(struct trie *t, struct tnode *tn); |
2f80b3c8 RO |
164 | static struct tnode *inflate(struct trie *t, struct tnode *tn); |
165 | static struct tnode *halve(struct trie *t, struct tnode *tn); | |
e0f7cb8c JP |
166 | /* tnodes to free after resize(); protected by RTNL */ |
167 | static struct tnode *tnode_free_head; | |
c3059477 JP |
168 | static size_t tnode_free_size; |
169 | ||
170 | /* | |
171 | * synchronize_rcu after call_rcu for that many pages; it should be especially | |
172 | * useful before resizing the root node with PREEMPT_NONE configs; the value was | |
173 | * obtained experimentally, aiming to avoid visible slowdown. | |
174 | */ | |
175 | static const int sync_pages = 128; | |
19baf839 | 176 | |
e18b890b | 177 | static struct kmem_cache *fn_alias_kmem __read_mostly; |
bc3c8c1e | 178 | static struct kmem_cache *trie_leaf_kmem __read_mostly; |
19baf839 | 179 | |
06801916 SH |
180 | static inline struct tnode *node_parent(struct node *node) |
181 | { | |
b59cfbf7 ED |
182 | return (struct tnode *)(node->parent & ~NODE_TYPE_MASK); |
183 | } | |
184 | ||
185 | static inline struct tnode *node_parent_rcu(struct node *node) | |
186 | { | |
187 | struct tnode *ret = node_parent(node); | |
06801916 | 188 | |
a034ee3c | 189 | return rcu_dereference_rtnl(ret); |
06801916 SH |
190 | } |
191 | ||
6440cc9e SH |
192 | /* Same as rcu_assign_pointer |
193 | * but that macro() assumes that value is a pointer. | |
194 | */ | |
06801916 SH |
195 | static inline void node_set_parent(struct node *node, struct tnode *ptr) |
196 | { | |
6440cc9e SH |
197 | smp_wmb(); |
198 | node->parent = (unsigned long)ptr | NODE_TYPE(node); | |
06801916 | 199 | } |
2373ce1c | 200 | |
b59cfbf7 ED |
201 | static inline struct node *tnode_get_child(struct tnode *tn, unsigned int i) |
202 | { | |
203 | BUG_ON(i >= 1U << tn->bits); | |
2373ce1c | 204 | |
b59cfbf7 ED |
205 | return tn->child[i]; |
206 | } | |
207 | ||
208 | static inline struct node *tnode_get_child_rcu(struct tnode *tn, unsigned int i) | |
19baf839 | 209 | { |
b59cfbf7 | 210 | struct node *ret = tnode_get_child(tn, i); |
19baf839 | 211 | |
a034ee3c | 212 | return rcu_dereference_rtnl(ret); |
19baf839 RO |
213 | } |
214 | ||
bb435b8d | 215 | static inline int tnode_child_length(const struct tnode *tn) |
19baf839 | 216 | { |
91b9a277 | 217 | return 1 << tn->bits; |
19baf839 RO |
218 | } |
219 | ||
ab66b4a7 SH |
220 | static inline t_key mask_pfx(t_key k, unsigned short l) |
221 | { | |
222 | return (l == 0) ? 0 : k >> (KEYLENGTH-l) << (KEYLENGTH-l); | |
223 | } | |
224 | ||
19baf839 RO |
225 | static inline t_key tkey_extract_bits(t_key a, int offset, int bits) |
226 | { | |
91b9a277 | 227 | if (offset < KEYLENGTH) |
19baf839 | 228 | return ((t_key)(a << offset)) >> (KEYLENGTH - bits); |
91b9a277 | 229 | else |
19baf839 RO |
230 | return 0; |
231 | } | |
232 | ||
233 | static inline int tkey_equals(t_key a, t_key b) | |
234 | { | |
c877efb2 | 235 | return a == b; |
19baf839 RO |
236 | } |
237 | ||
238 | static inline int tkey_sub_equals(t_key a, int offset, int bits, t_key b) | |
239 | { | |
c877efb2 SH |
240 | if (bits == 0 || offset >= KEYLENGTH) |
241 | return 1; | |
91b9a277 OJ |
242 | bits = bits > KEYLENGTH ? KEYLENGTH : bits; |
243 | return ((a ^ b) << offset) >> (KEYLENGTH - bits) == 0; | |
c877efb2 | 244 | } |
19baf839 RO |
245 | |
246 | static inline int tkey_mismatch(t_key a, int offset, t_key b) | |
247 | { | |
248 | t_key diff = a ^ b; | |
249 | int i = offset; | |
250 | ||
c877efb2 SH |
251 | if (!diff) |
252 | return 0; | |
253 | while ((diff << i) >> (KEYLENGTH-1) == 0) | |
19baf839 RO |
254 | i++; |
255 | return i; | |
256 | } | |
257 | ||
19baf839 | 258 | /* |
e905a9ed YH |
259 | To understand this stuff, an understanding of keys and all their bits is |
260 | necessary. Every node in the trie has a key associated with it, but not | |
19baf839 RO |
261 | all of the bits in that key are significant. |
262 | ||
263 | Consider a node 'n' and its parent 'tp'. | |
264 | ||
e905a9ed YH |
265 | If n is a leaf, every bit in its key is significant. Its presence is |
266 | necessitated by path compression, since during a tree traversal (when | |
267 | searching for a leaf - unless we are doing an insertion) we will completely | |
268 | ignore all skipped bits we encounter. Thus we need to verify, at the end of | |
269 | a potentially successful search, that we have indeed been walking the | |
19baf839 RO |
270 | correct key path. |
271 | ||
e905a9ed YH |
272 | Note that we can never "miss" the correct key in the tree if present by |
273 | following the wrong path. Path compression ensures that segments of the key | |
274 | that are the same for all keys with a given prefix are skipped, but the | |
275 | skipped part *is* identical for each node in the subtrie below the skipped | |
276 | bit! trie_insert() in this implementation takes care of that - note the | |
19baf839 RO |
277 | call to tkey_sub_equals() in trie_insert(). |
278 | ||
e905a9ed | 279 | if n is an internal node - a 'tnode' here, the various parts of its key |
19baf839 RO |
280 | have many different meanings. |
281 | ||
e905a9ed | 282 | Example: |
19baf839 RO |
283 | _________________________________________________________________ |
284 | | i | i | i | i | i | i | i | N | N | N | S | S | S | S | S | C | | |
285 | ----------------------------------------------------------------- | |
e905a9ed | 286 | 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 |
19baf839 RO |
287 | |
288 | _________________________________________________________________ | |
289 | | C | C | C | u | u | u | u | u | u | u | u | u | u | u | u | u | | |
290 | ----------------------------------------------------------------- | |
291 | 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 | |
292 | ||
293 | tp->pos = 7 | |
294 | tp->bits = 3 | |
295 | n->pos = 15 | |
91b9a277 | 296 | n->bits = 4 |
19baf839 | 297 | |
e905a9ed YH |
298 | First, let's just ignore the bits that come before the parent tp, that is |
299 | the bits from 0 to (tp->pos-1). They are *known* but at this point we do | |
19baf839 RO |
300 | not use them for anything. |
301 | ||
302 | The bits from (tp->pos) to (tp->pos + tp->bits - 1) - "N", above - are the | |
e905a9ed | 303 | index into the parent's child array. That is, they will be used to find |
19baf839 RO |
304 | 'n' among tp's children. |
305 | ||
306 | The bits from (tp->pos + tp->bits) to (n->pos - 1) - "S" - are skipped bits | |
307 | for the node n. | |
308 | ||
e905a9ed | 309 | All the bits we have seen so far are significant to the node n. The rest |
19baf839 RO |
310 | of the bits are really not needed or indeed known in n->key. |
311 | ||
e905a9ed | 312 | The bits from (n->pos) to (n->pos + n->bits - 1) - "C" - are the index into |
19baf839 | 313 | n's child array, and will of course be different for each child. |
e905a9ed | 314 | |
c877efb2 | 315 | |
19baf839 RO |
316 | The rest of the bits, from (n->pos + n->bits) onward, are completely unknown |
317 | at this point. | |
318 | ||
319 | */ | |
320 | ||
0c7770c7 | 321 | static inline void check_tnode(const struct tnode *tn) |
19baf839 | 322 | { |
0c7770c7 | 323 | WARN_ON(tn && tn->pos+tn->bits > 32); |
19baf839 RO |
324 | } |
325 | ||
f5026fab DL |
326 | static const int halve_threshold = 25; |
327 | static const int inflate_threshold = 50; | |
345aa031 | 328 | static const int halve_threshold_root = 15; |
80b71b80 | 329 | static const int inflate_threshold_root = 30; |
2373ce1c RO |
330 | |
331 | static void __alias_free_mem(struct rcu_head *head) | |
19baf839 | 332 | { |
2373ce1c RO |
333 | struct fib_alias *fa = container_of(head, struct fib_alias, rcu); |
334 | kmem_cache_free(fn_alias_kmem, fa); | |
19baf839 RO |
335 | } |
336 | ||
2373ce1c | 337 | static inline void alias_free_mem_rcu(struct fib_alias *fa) |
19baf839 | 338 | { |
2373ce1c RO |
339 | call_rcu(&fa->rcu, __alias_free_mem); |
340 | } | |
91b9a277 | 341 | |
2373ce1c RO |
342 | static void __leaf_free_rcu(struct rcu_head *head) |
343 | { | |
bc3c8c1e SH |
344 | struct leaf *l = container_of(head, struct leaf, rcu); |
345 | kmem_cache_free(trie_leaf_kmem, l); | |
2373ce1c | 346 | } |
91b9a277 | 347 | |
387a5487 SH |
348 | static inline void free_leaf(struct leaf *l) |
349 | { | |
350 | call_rcu_bh(&l->rcu, __leaf_free_rcu); | |
351 | } | |
352 | ||
2373ce1c | 353 | static void __leaf_info_free_rcu(struct rcu_head *head) |
19baf839 | 354 | { |
2373ce1c | 355 | kfree(container_of(head, struct leaf_info, rcu)); |
19baf839 RO |
356 | } |
357 | ||
2373ce1c | 358 | static inline void free_leaf_info(struct leaf_info *leaf) |
19baf839 | 359 | { |
2373ce1c | 360 | call_rcu(&leaf->rcu, __leaf_info_free_rcu); |
19baf839 RO |
361 | } |
362 | ||
8d965444 | 363 | static struct tnode *tnode_alloc(size_t size) |
f0e36f8c | 364 | { |
2373ce1c | 365 | if (size <= PAGE_SIZE) |
8d965444 | 366 | return kzalloc(size, GFP_KERNEL); |
15be75cd SH |
367 | else |
368 | return __vmalloc(size, GFP_KERNEL | __GFP_ZERO, PAGE_KERNEL); | |
369 | } | |
2373ce1c | 370 | |
15be75cd SH |
371 | static void __tnode_vfree(struct work_struct *arg) |
372 | { | |
373 | struct tnode *tn = container_of(arg, struct tnode, work); | |
374 | vfree(tn); | |
f0e36f8c PM |
375 | } |
376 | ||
2373ce1c | 377 | static void __tnode_free_rcu(struct rcu_head *head) |
f0e36f8c | 378 | { |
2373ce1c | 379 | struct tnode *tn = container_of(head, struct tnode, rcu); |
8d965444 ED |
380 | size_t size = sizeof(struct tnode) + |
381 | (sizeof(struct node *) << tn->bits); | |
f0e36f8c PM |
382 | |
383 | if (size <= PAGE_SIZE) | |
384 | kfree(tn); | |
15be75cd SH |
385 | else { |
386 | INIT_WORK(&tn->work, __tnode_vfree); | |
387 | schedule_work(&tn->work); | |
388 | } | |
f0e36f8c PM |
389 | } |
390 | ||
2373ce1c RO |
391 | static inline void tnode_free(struct tnode *tn) |
392 | { | |
387a5487 SH |
393 | if (IS_LEAF(tn)) |
394 | free_leaf((struct leaf *) tn); | |
395 | else | |
550e29bc | 396 | call_rcu(&tn->rcu, __tnode_free_rcu); |
2373ce1c RO |
397 | } |
398 | ||
e0f7cb8c JP |
399 | static void tnode_free_safe(struct tnode *tn) |
400 | { | |
401 | BUG_ON(IS_LEAF(tn)); | |
7b85576d JP |
402 | tn->tnode_free = tnode_free_head; |
403 | tnode_free_head = tn; | |
c3059477 JP |
404 | tnode_free_size += sizeof(struct tnode) + |
405 | (sizeof(struct node *) << tn->bits); | |
e0f7cb8c JP |
406 | } |
407 | ||
408 | static void tnode_free_flush(void) | |
409 | { | |
410 | struct tnode *tn; | |
411 | ||
412 | while ((tn = tnode_free_head)) { | |
413 | tnode_free_head = tn->tnode_free; | |
414 | tn->tnode_free = NULL; | |
415 | tnode_free(tn); | |
416 | } | |
c3059477 JP |
417 | |
418 | if (tnode_free_size >= PAGE_SIZE * sync_pages) { | |
419 | tnode_free_size = 0; | |
420 | synchronize_rcu(); | |
421 | } | |
e0f7cb8c JP |
422 | } |
423 | ||
2373ce1c RO |
424 | static struct leaf *leaf_new(void) |
425 | { | |
bc3c8c1e | 426 | struct leaf *l = kmem_cache_alloc(trie_leaf_kmem, GFP_KERNEL); |
2373ce1c RO |
427 | if (l) { |
428 | l->parent = T_LEAF; | |
429 | INIT_HLIST_HEAD(&l->list); | |
430 | } | |
431 | return l; | |
432 | } | |
433 | ||
434 | static struct leaf_info *leaf_info_new(int plen) | |
435 | { | |
436 | struct leaf_info *li = kmalloc(sizeof(struct leaf_info), GFP_KERNEL); | |
437 | if (li) { | |
438 | li->plen = plen; | |
439 | INIT_LIST_HEAD(&li->falh); | |
440 | } | |
441 | return li; | |
442 | } | |
443 | ||
a07f5f50 | 444 | static struct tnode *tnode_new(t_key key, int pos, int bits) |
19baf839 | 445 | { |
8d965444 | 446 | size_t sz = sizeof(struct tnode) + (sizeof(struct node *) << bits); |
f0e36f8c | 447 | struct tnode *tn = tnode_alloc(sz); |
19baf839 | 448 | |
91b9a277 | 449 | if (tn) { |
2373ce1c | 450 | tn->parent = T_TNODE; |
19baf839 RO |
451 | tn->pos = pos; |
452 | tn->bits = bits; | |
453 | tn->key = key; | |
454 | tn->full_children = 0; | |
455 | tn->empty_children = 1<<bits; | |
456 | } | |
c877efb2 | 457 | |
a034ee3c ED |
458 | pr_debug("AT %p s=%zu %zu\n", tn, sizeof(struct tnode), |
459 | sizeof(struct node) << bits); | |
19baf839 RO |
460 | return tn; |
461 | } | |
462 | ||
19baf839 RO |
463 | /* |
464 | * Check whether a tnode 'n' is "full", i.e. it is an internal node | |
465 | * and no bits are skipped. See discussion in dyntree paper p. 6 | |
466 | */ | |
467 | ||
bb435b8d | 468 | static inline int tnode_full(const struct tnode *tn, const struct node *n) |
19baf839 | 469 | { |
c877efb2 | 470 | if (n == NULL || IS_LEAF(n)) |
19baf839 RO |
471 | return 0; |
472 | ||
473 | return ((struct tnode *) n)->pos == tn->pos + tn->bits; | |
474 | } | |
475 | ||
a07f5f50 SH |
476 | static inline void put_child(struct trie *t, struct tnode *tn, int i, |
477 | struct node *n) | |
19baf839 RO |
478 | { |
479 | tnode_put_child_reorg(tn, i, n, -1); | |
480 | } | |
481 | ||
c877efb2 | 482 | /* |
19baf839 RO |
483 | * Add a child at position i overwriting the old value. |
484 | * Update the value of full_children and empty_children. | |
485 | */ | |
486 | ||
a07f5f50 SH |
487 | static void tnode_put_child_reorg(struct tnode *tn, int i, struct node *n, |
488 | int wasfull) | |
19baf839 | 489 | { |
2373ce1c | 490 | struct node *chi = tn->child[i]; |
19baf839 RO |
491 | int isfull; |
492 | ||
0c7770c7 SH |
493 | BUG_ON(i >= 1<<tn->bits); |
494 | ||
19baf839 RO |
495 | /* update emptyChildren */ |
496 | if (n == NULL && chi != NULL) | |
497 | tn->empty_children++; | |
498 | else if (n != NULL && chi == NULL) | |
499 | tn->empty_children--; | |
c877efb2 | 500 | |
19baf839 | 501 | /* update fullChildren */ |
91b9a277 | 502 | if (wasfull == -1) |
19baf839 RO |
503 | wasfull = tnode_full(tn, chi); |
504 | ||
505 | isfull = tnode_full(tn, n); | |
c877efb2 | 506 | if (wasfull && !isfull) |
19baf839 | 507 | tn->full_children--; |
c877efb2 | 508 | else if (!wasfull && isfull) |
19baf839 | 509 | tn->full_children++; |
91b9a277 | 510 | |
c877efb2 | 511 | if (n) |
06801916 | 512 | node_set_parent(n, tn); |
19baf839 | 513 | |
2373ce1c | 514 | rcu_assign_pointer(tn->child[i], n); |
19baf839 RO |
515 | } |
516 | ||
80b71b80 | 517 | #define MAX_WORK 10 |
c877efb2 | 518 | static struct node *resize(struct trie *t, struct tnode *tn) |
19baf839 RO |
519 | { |
520 | int i; | |
2f80b3c8 | 521 | struct tnode *old_tn; |
e6308be8 RO |
522 | int inflate_threshold_use; |
523 | int halve_threshold_use; | |
80b71b80 | 524 | int max_work; |
19baf839 | 525 | |
e905a9ed | 526 | if (!tn) |
19baf839 RO |
527 | return NULL; |
528 | ||
0c7770c7 SH |
529 | pr_debug("In tnode_resize %p inflate_threshold=%d threshold=%d\n", |
530 | tn, inflate_threshold, halve_threshold); | |
19baf839 RO |
531 | |
532 | /* No children */ | |
533 | if (tn->empty_children == tnode_child_length(tn)) { | |
e0f7cb8c | 534 | tnode_free_safe(tn); |
19baf839 RO |
535 | return NULL; |
536 | } | |
537 | /* One child */ | |
538 | if (tn->empty_children == tnode_child_length(tn) - 1) | |
80b71b80 | 539 | goto one_child; |
c877efb2 | 540 | /* |
19baf839 RO |
541 | * Double as long as the resulting node has a number of |
542 | * nonempty nodes that are above the threshold. | |
543 | */ | |
544 | ||
545 | /* | |
c877efb2 SH |
546 | * From "Implementing a dynamic compressed trie" by Stefan Nilsson of |
547 | * the Helsinki University of Technology and Matti Tikkanen of Nokia | |
19baf839 | 548 | * Telecommunications, page 6: |
c877efb2 | 549 | * "A node is doubled if the ratio of non-empty children to all |
19baf839 RO |
550 | * children in the *doubled* node is at least 'high'." |
551 | * | |
c877efb2 SH |
552 | * 'high' in this instance is the variable 'inflate_threshold'. It |
553 | * is expressed as a percentage, so we multiply it with | |
554 | * tnode_child_length() and instead of multiplying by 2 (since the | |
555 | * child array will be doubled by inflate()) and multiplying | |
556 | * the left-hand side by 100 (to handle the percentage thing) we | |
19baf839 | 557 | * multiply the left-hand side by 50. |
c877efb2 SH |
558 | * |
559 | * The left-hand side may look a bit weird: tnode_child_length(tn) | |
560 | * - tn->empty_children is of course the number of non-null children | |
561 | * in the current node. tn->full_children is the number of "full" | |
19baf839 | 562 | * children, that is non-null tnodes with a skip value of 0. |
c877efb2 | 563 | * All of those will be doubled in the resulting inflated tnode, so |
19baf839 | 564 | * we just count them one extra time here. |
c877efb2 | 565 | * |
19baf839 | 566 | * A clearer way to write this would be: |
c877efb2 | 567 | * |
19baf839 | 568 | * to_be_doubled = tn->full_children; |
c877efb2 | 569 | * not_to_be_doubled = tnode_child_length(tn) - tn->empty_children - |
19baf839 RO |
570 | * tn->full_children; |
571 | * | |
572 | * new_child_length = tnode_child_length(tn) * 2; | |
573 | * | |
c877efb2 | 574 | * new_fill_factor = 100 * (not_to_be_doubled + 2*to_be_doubled) / |
19baf839 RO |
575 | * new_child_length; |
576 | * if (new_fill_factor >= inflate_threshold) | |
c877efb2 SH |
577 | * |
578 | * ...and so on, tho it would mess up the while () loop. | |
579 | * | |
19baf839 RO |
580 | * anyway, |
581 | * 100 * (not_to_be_doubled + 2*to_be_doubled) / new_child_length >= | |
582 | * inflate_threshold | |
c877efb2 | 583 | * |
19baf839 RO |
584 | * avoid a division: |
585 | * 100 * (not_to_be_doubled + 2*to_be_doubled) >= | |
586 | * inflate_threshold * new_child_length | |
c877efb2 | 587 | * |
19baf839 | 588 | * expand not_to_be_doubled and to_be_doubled, and shorten: |
c877efb2 | 589 | * 100 * (tnode_child_length(tn) - tn->empty_children + |
91b9a277 | 590 | * tn->full_children) >= inflate_threshold * new_child_length |
c877efb2 | 591 | * |
19baf839 | 592 | * expand new_child_length: |
c877efb2 | 593 | * 100 * (tnode_child_length(tn) - tn->empty_children + |
91b9a277 | 594 | * tn->full_children) >= |
19baf839 | 595 | * inflate_threshold * tnode_child_length(tn) * 2 |
c877efb2 | 596 | * |
19baf839 | 597 | * shorten again: |
c877efb2 | 598 | * 50 * (tn->full_children + tnode_child_length(tn) - |
91b9a277 | 599 | * tn->empty_children) >= inflate_threshold * |
19baf839 | 600 | * tnode_child_length(tn) |
c877efb2 | 601 | * |
19baf839 RO |
602 | */ |
603 | ||
604 | check_tnode(tn); | |
c877efb2 | 605 | |
e6308be8 RO |
606 | /* Keep root node larger */ |
607 | ||
a034ee3c | 608 | if (!node_parent((struct node *)tn)) { |
80b71b80 JL |
609 | inflate_threshold_use = inflate_threshold_root; |
610 | halve_threshold_use = halve_threshold_root; | |
a034ee3c | 611 | } else { |
e6308be8 | 612 | inflate_threshold_use = inflate_threshold; |
80b71b80 JL |
613 | halve_threshold_use = halve_threshold; |
614 | } | |
e6308be8 | 615 | |
80b71b80 JL |
616 | max_work = MAX_WORK; |
617 | while ((tn->full_children > 0 && max_work-- && | |
a07f5f50 SH |
618 | 50 * (tn->full_children + tnode_child_length(tn) |
619 | - tn->empty_children) | |
620 | >= inflate_threshold_use * tnode_child_length(tn))) { | |
19baf839 | 621 | |
2f80b3c8 RO |
622 | old_tn = tn; |
623 | tn = inflate(t, tn); | |
a07f5f50 | 624 | |
2f80b3c8 RO |
625 | if (IS_ERR(tn)) { |
626 | tn = old_tn; | |
2f36895a RO |
627 | #ifdef CONFIG_IP_FIB_TRIE_STATS |
628 | t->stats.resize_node_skipped++; | |
629 | #endif | |
630 | break; | |
631 | } | |
19baf839 RO |
632 | } |
633 | ||
634 | check_tnode(tn); | |
635 | ||
80b71b80 | 636 | /* Return if at least one inflate is run */ |
a034ee3c | 637 | if (max_work != MAX_WORK) |
80b71b80 JL |
638 | return (struct node *) tn; |
639 | ||
19baf839 RO |
640 | /* |
641 | * Halve as long as the number of empty children in this | |
642 | * node is above threshold. | |
643 | */ | |
2f36895a | 644 | |
80b71b80 JL |
645 | max_work = MAX_WORK; |
646 | while (tn->bits > 1 && max_work-- && | |
19baf839 | 647 | 100 * (tnode_child_length(tn) - tn->empty_children) < |
e6308be8 | 648 | halve_threshold_use * tnode_child_length(tn)) { |
2f36895a | 649 | |
2f80b3c8 RO |
650 | old_tn = tn; |
651 | tn = halve(t, tn); | |
652 | if (IS_ERR(tn)) { | |
653 | tn = old_tn; | |
2f36895a RO |
654 | #ifdef CONFIG_IP_FIB_TRIE_STATS |
655 | t->stats.resize_node_skipped++; | |
656 | #endif | |
657 | break; | |
658 | } | |
659 | } | |
19baf839 | 660 | |
c877efb2 | 661 | |
19baf839 | 662 | /* Only one child remains */ |
80b71b80 JL |
663 | if (tn->empty_children == tnode_child_length(tn) - 1) { |
664 | one_child: | |
19baf839 | 665 | for (i = 0; i < tnode_child_length(tn); i++) { |
91b9a277 | 666 | struct node *n; |
19baf839 | 667 | |
91b9a277 | 668 | n = tn->child[i]; |
2373ce1c | 669 | if (!n) |
91b9a277 | 670 | continue; |
91b9a277 OJ |
671 | |
672 | /* compress one level */ | |
673 | ||
06801916 | 674 | node_set_parent(n, NULL); |
e0f7cb8c | 675 | tnode_free_safe(tn); |
91b9a277 | 676 | return n; |
19baf839 | 677 | } |
80b71b80 | 678 | } |
19baf839 RO |
679 | return (struct node *) tn; |
680 | } | |
681 | ||
2f80b3c8 | 682 | static struct tnode *inflate(struct trie *t, struct tnode *tn) |
19baf839 | 683 | { |
19baf839 RO |
684 | struct tnode *oldtnode = tn; |
685 | int olen = tnode_child_length(tn); | |
686 | int i; | |
687 | ||
0c7770c7 | 688 | pr_debug("In inflate\n"); |
19baf839 RO |
689 | |
690 | tn = tnode_new(oldtnode->key, oldtnode->pos, oldtnode->bits + 1); | |
691 | ||
0c7770c7 | 692 | if (!tn) |
2f80b3c8 | 693 | return ERR_PTR(-ENOMEM); |
2f36895a RO |
694 | |
695 | /* | |
c877efb2 SH |
696 | * Preallocate and store tnodes before the actual work so we |
697 | * don't get into an inconsistent state if memory allocation | |
698 | * fails. In case of failure we return the oldnode and inflate | |
2f36895a RO |
699 | * of tnode is ignored. |
700 | */ | |
91b9a277 OJ |
701 | |
702 | for (i = 0; i < olen; i++) { | |
a07f5f50 | 703 | struct tnode *inode; |
2f36895a | 704 | |
a07f5f50 | 705 | inode = (struct tnode *) tnode_get_child(oldtnode, i); |
2f36895a RO |
706 | if (inode && |
707 | IS_TNODE(inode) && | |
708 | inode->pos == oldtnode->pos + oldtnode->bits && | |
709 | inode->bits > 1) { | |
710 | struct tnode *left, *right; | |
ab66b4a7 | 711 | t_key m = ~0U << (KEYLENGTH - 1) >> inode->pos; |
c877efb2 | 712 | |
2f36895a RO |
713 | left = tnode_new(inode->key&(~m), inode->pos + 1, |
714 | inode->bits - 1); | |
2f80b3c8 RO |
715 | if (!left) |
716 | goto nomem; | |
91b9a277 | 717 | |
2f36895a RO |
718 | right = tnode_new(inode->key|m, inode->pos + 1, |
719 | inode->bits - 1); | |
720 | ||
e905a9ed | 721 | if (!right) { |
2f80b3c8 RO |
722 | tnode_free(left); |
723 | goto nomem; | |
e905a9ed | 724 | } |
2f36895a RO |
725 | |
726 | put_child(t, tn, 2*i, (struct node *) left); | |
727 | put_child(t, tn, 2*i+1, (struct node *) right); | |
728 | } | |
729 | } | |
730 | ||
91b9a277 | 731 | for (i = 0; i < olen; i++) { |
c95aaf9a | 732 | struct tnode *inode; |
19baf839 | 733 | struct node *node = tnode_get_child(oldtnode, i); |
91b9a277 OJ |
734 | struct tnode *left, *right; |
735 | int size, j; | |
c877efb2 | 736 | |
19baf839 RO |
737 | /* An empty child */ |
738 | if (node == NULL) | |
739 | continue; | |
740 | ||
741 | /* A leaf or an internal node with skipped bits */ | |
742 | ||
c877efb2 | 743 | if (IS_LEAF(node) || ((struct tnode *) node)->pos > |
19baf839 | 744 | tn->pos + tn->bits - 1) { |
a07f5f50 SH |
745 | if (tkey_extract_bits(node->key, |
746 | oldtnode->pos + oldtnode->bits, | |
747 | 1) == 0) | |
19baf839 RO |
748 | put_child(t, tn, 2*i, node); |
749 | else | |
750 | put_child(t, tn, 2*i+1, node); | |
751 | continue; | |
752 | } | |
753 | ||
754 | /* An internal node with two children */ | |
755 | inode = (struct tnode *) node; | |
756 | ||
757 | if (inode->bits == 1) { | |
758 | put_child(t, tn, 2*i, inode->child[0]); | |
759 | put_child(t, tn, 2*i+1, inode->child[1]); | |
760 | ||
e0f7cb8c | 761 | tnode_free_safe(inode); |
91b9a277 | 762 | continue; |
19baf839 RO |
763 | } |
764 | ||
91b9a277 OJ |
765 | /* An internal node with more than two children */ |
766 | ||
767 | /* We will replace this node 'inode' with two new | |
768 | * ones, 'left' and 'right', each with half of the | |
769 | * original children. The two new nodes will have | |
770 | * a position one bit further down the key and this | |
771 | * means that the "significant" part of their keys | |
772 | * (see the discussion near the top of this file) | |
773 | * will differ by one bit, which will be "0" in | |
774 | * left's key and "1" in right's key. Since we are | |
775 | * moving the key position by one step, the bit that | |
776 | * we are moving away from - the bit at position | |
777 | * (inode->pos) - is the one that will differ between | |
778 | * left and right. So... we synthesize that bit in the | |
779 | * two new keys. | |
780 | * The mask 'm' below will be a single "one" bit at | |
781 | * the position (inode->pos) | |
782 | */ | |
19baf839 | 783 | |
91b9a277 OJ |
784 | /* Use the old key, but set the new significant |
785 | * bit to zero. | |
786 | */ | |
2f36895a | 787 | |
91b9a277 OJ |
788 | left = (struct tnode *) tnode_get_child(tn, 2*i); |
789 | put_child(t, tn, 2*i, NULL); | |
2f36895a | 790 | |
91b9a277 | 791 | BUG_ON(!left); |
2f36895a | 792 | |
91b9a277 OJ |
793 | right = (struct tnode *) tnode_get_child(tn, 2*i+1); |
794 | put_child(t, tn, 2*i+1, NULL); | |
19baf839 | 795 | |
91b9a277 | 796 | BUG_ON(!right); |
19baf839 | 797 | |
91b9a277 OJ |
798 | size = tnode_child_length(left); |
799 | for (j = 0; j < size; j++) { | |
800 | put_child(t, left, j, inode->child[j]); | |
801 | put_child(t, right, j, inode->child[j + size]); | |
19baf839 | 802 | } |
91b9a277 OJ |
803 | put_child(t, tn, 2*i, resize(t, left)); |
804 | put_child(t, tn, 2*i+1, resize(t, right)); | |
805 | ||
e0f7cb8c | 806 | tnode_free_safe(inode); |
19baf839 | 807 | } |
e0f7cb8c | 808 | tnode_free_safe(oldtnode); |
19baf839 | 809 | return tn; |
2f80b3c8 RO |
810 | nomem: |
811 | { | |
812 | int size = tnode_child_length(tn); | |
813 | int j; | |
814 | ||
0c7770c7 | 815 | for (j = 0; j < size; j++) |
2f80b3c8 RO |
816 | if (tn->child[j]) |
817 | tnode_free((struct tnode *)tn->child[j]); | |
818 | ||
819 | tnode_free(tn); | |
0c7770c7 | 820 | |
2f80b3c8 RO |
821 | return ERR_PTR(-ENOMEM); |
822 | } | |
19baf839 RO |
823 | } |
824 | ||
2f80b3c8 | 825 | static struct tnode *halve(struct trie *t, struct tnode *tn) |
19baf839 RO |
826 | { |
827 | struct tnode *oldtnode = tn; | |
828 | struct node *left, *right; | |
829 | int i; | |
830 | int olen = tnode_child_length(tn); | |
831 | ||
0c7770c7 | 832 | pr_debug("In halve\n"); |
c877efb2 SH |
833 | |
834 | tn = tnode_new(oldtnode->key, oldtnode->pos, oldtnode->bits - 1); | |
19baf839 | 835 | |
2f80b3c8 RO |
836 | if (!tn) |
837 | return ERR_PTR(-ENOMEM); | |
2f36895a RO |
838 | |
839 | /* | |
c877efb2 SH |
840 | * Preallocate and store tnodes before the actual work so we |
841 | * don't get into an inconsistent state if memory allocation | |
842 | * fails. In case of failure we return the oldnode and halve | |
2f36895a RO |
843 | * of tnode is ignored. |
844 | */ | |
845 | ||
91b9a277 | 846 | for (i = 0; i < olen; i += 2) { |
2f36895a RO |
847 | left = tnode_get_child(oldtnode, i); |
848 | right = tnode_get_child(oldtnode, i+1); | |
c877efb2 | 849 | |
2f36895a | 850 | /* Two nonempty children */ |
0c7770c7 | 851 | if (left && right) { |
2f80b3c8 | 852 | struct tnode *newn; |
0c7770c7 | 853 | |
2f80b3c8 | 854 | newn = tnode_new(left->key, tn->pos + tn->bits, 1); |
0c7770c7 SH |
855 | |
856 | if (!newn) | |
2f80b3c8 | 857 | goto nomem; |
0c7770c7 | 858 | |
2f80b3c8 | 859 | put_child(t, tn, i/2, (struct node *)newn); |
2f36895a | 860 | } |
2f36895a | 861 | |
2f36895a | 862 | } |
19baf839 | 863 | |
91b9a277 OJ |
864 | for (i = 0; i < olen; i += 2) { |
865 | struct tnode *newBinNode; | |
866 | ||
19baf839 RO |
867 | left = tnode_get_child(oldtnode, i); |
868 | right = tnode_get_child(oldtnode, i+1); | |
c877efb2 | 869 | |
19baf839 RO |
870 | /* At least one of the children is empty */ |
871 | if (left == NULL) { | |
872 | if (right == NULL) /* Both are empty */ | |
873 | continue; | |
874 | put_child(t, tn, i/2, right); | |
91b9a277 | 875 | continue; |
0c7770c7 | 876 | } |
91b9a277 OJ |
877 | |
878 | if (right == NULL) { | |
19baf839 | 879 | put_child(t, tn, i/2, left); |
91b9a277 OJ |
880 | continue; |
881 | } | |
c877efb2 | 882 | |
19baf839 | 883 | /* Two nonempty children */ |
91b9a277 OJ |
884 | newBinNode = (struct tnode *) tnode_get_child(tn, i/2); |
885 | put_child(t, tn, i/2, NULL); | |
91b9a277 OJ |
886 | put_child(t, newBinNode, 0, left); |
887 | put_child(t, newBinNode, 1, right); | |
888 | put_child(t, tn, i/2, resize(t, newBinNode)); | |
19baf839 | 889 | } |
e0f7cb8c | 890 | tnode_free_safe(oldtnode); |
19baf839 | 891 | return tn; |
2f80b3c8 RO |
892 | nomem: |
893 | { | |
894 | int size = tnode_child_length(tn); | |
895 | int j; | |
896 | ||
0c7770c7 | 897 | for (j = 0; j < size; j++) |
2f80b3c8 RO |
898 | if (tn->child[j]) |
899 | tnode_free((struct tnode *)tn->child[j]); | |
900 | ||
901 | tnode_free(tn); | |
0c7770c7 | 902 | |
2f80b3c8 RO |
903 | return ERR_PTR(-ENOMEM); |
904 | } | |
19baf839 RO |
905 | } |
906 | ||
772cb712 | 907 | /* readside must use rcu_read_lock currently dump routines |
2373ce1c RO |
908 | via get_fa_head and dump */ |
909 | ||
772cb712 | 910 | static struct leaf_info *find_leaf_info(struct leaf *l, int plen) |
19baf839 | 911 | { |
772cb712 | 912 | struct hlist_head *head = &l->list; |
19baf839 RO |
913 | struct hlist_node *node; |
914 | struct leaf_info *li; | |
915 | ||
2373ce1c | 916 | hlist_for_each_entry_rcu(li, node, head, hlist) |
c877efb2 | 917 | if (li->plen == plen) |
19baf839 | 918 | return li; |
91b9a277 | 919 | |
19baf839 RO |
920 | return NULL; |
921 | } | |
922 | ||
a07f5f50 | 923 | static inline struct list_head *get_fa_head(struct leaf *l, int plen) |
19baf839 | 924 | { |
772cb712 | 925 | struct leaf_info *li = find_leaf_info(l, plen); |
c877efb2 | 926 | |
91b9a277 OJ |
927 | if (!li) |
928 | return NULL; | |
c877efb2 | 929 | |
91b9a277 | 930 | return &li->falh; |
19baf839 RO |
931 | } |
932 | ||
933 | static void insert_leaf_info(struct hlist_head *head, struct leaf_info *new) | |
934 | { | |
e905a9ed YH |
935 | struct leaf_info *li = NULL, *last = NULL; |
936 | struct hlist_node *node; | |
937 | ||
938 | if (hlist_empty(head)) { | |
939 | hlist_add_head_rcu(&new->hlist, head); | |
940 | } else { | |
941 | hlist_for_each_entry(li, node, head, hlist) { | |
942 | if (new->plen > li->plen) | |
943 | break; | |
944 | ||
945 | last = li; | |
946 | } | |
947 | if (last) | |
948 | hlist_add_after_rcu(&last->hlist, &new->hlist); | |
949 | else | |
950 | hlist_add_before_rcu(&new->hlist, &li->hlist); | |
951 | } | |
19baf839 RO |
952 | } |
953 | ||
2373ce1c RO |
954 | /* rcu_read_lock needs to be hold by caller from readside */ |
955 | ||
19baf839 RO |
956 | static struct leaf * |
957 | fib_find_node(struct trie *t, u32 key) | |
958 | { | |
959 | int pos; | |
960 | struct tnode *tn; | |
961 | struct node *n; | |
962 | ||
963 | pos = 0; | |
a034ee3c | 964 | n = rcu_dereference_rtnl(t->trie); |
19baf839 RO |
965 | |
966 | while (n != NULL && NODE_TYPE(n) == T_TNODE) { | |
967 | tn = (struct tnode *) n; | |
91b9a277 | 968 | |
19baf839 | 969 | check_tnode(tn); |
91b9a277 | 970 | |
c877efb2 | 971 | if (tkey_sub_equals(tn->key, pos, tn->pos-pos, key)) { |
91b9a277 | 972 | pos = tn->pos + tn->bits; |
a07f5f50 SH |
973 | n = tnode_get_child_rcu(tn, |
974 | tkey_extract_bits(key, | |
975 | tn->pos, | |
976 | tn->bits)); | |
91b9a277 | 977 | } else |
19baf839 RO |
978 | break; |
979 | } | |
980 | /* Case we have found a leaf. Compare prefixes */ | |
981 | ||
91b9a277 OJ |
982 | if (n != NULL && IS_LEAF(n) && tkey_equals(key, n->key)) |
983 | return (struct leaf *)n; | |
984 | ||
19baf839 RO |
985 | return NULL; |
986 | } | |
987 | ||
7b85576d | 988 | static void trie_rebalance(struct trie *t, struct tnode *tn) |
19baf839 | 989 | { |
19baf839 | 990 | int wasfull; |
3ed18d76 | 991 | t_key cindex, key; |
06801916 | 992 | struct tnode *tp; |
19baf839 | 993 | |
3ed18d76 RO |
994 | key = tn->key; |
995 | ||
06801916 | 996 | while (tn != NULL && (tp = node_parent((struct node *)tn)) != NULL) { |
19baf839 RO |
997 | cindex = tkey_extract_bits(key, tp->pos, tp->bits); |
998 | wasfull = tnode_full(tp, tnode_get_child(tp, cindex)); | |
a07f5f50 SH |
999 | tn = (struct tnode *) resize(t, (struct tnode *)tn); |
1000 | ||
1001 | tnode_put_child_reorg((struct tnode *)tp, cindex, | |
1002 | (struct node *)tn, wasfull); | |
91b9a277 | 1003 | |
06801916 | 1004 | tp = node_parent((struct node *) tn); |
008440e3 JP |
1005 | if (!tp) |
1006 | rcu_assign_pointer(t->trie, (struct node *)tn); | |
1007 | ||
e0f7cb8c | 1008 | tnode_free_flush(); |
06801916 | 1009 | if (!tp) |
19baf839 | 1010 | break; |
06801916 | 1011 | tn = tp; |
19baf839 | 1012 | } |
06801916 | 1013 | |
19baf839 | 1014 | /* Handle last (top) tnode */ |
7b85576d | 1015 | if (IS_TNODE(tn)) |
a07f5f50 | 1016 | tn = (struct tnode *)resize(t, (struct tnode *)tn); |
19baf839 | 1017 | |
7b85576d JP |
1018 | rcu_assign_pointer(t->trie, (struct node *)tn); |
1019 | tnode_free_flush(); | |
19baf839 RO |
1020 | } |
1021 | ||
2373ce1c RO |
1022 | /* only used from updater-side */ |
1023 | ||
fea86ad8 | 1024 | static struct list_head *fib_insert_node(struct trie *t, u32 key, int plen) |
19baf839 RO |
1025 | { |
1026 | int pos, newpos; | |
1027 | struct tnode *tp = NULL, *tn = NULL; | |
1028 | struct node *n; | |
1029 | struct leaf *l; | |
1030 | int missbit; | |
c877efb2 | 1031 | struct list_head *fa_head = NULL; |
19baf839 RO |
1032 | struct leaf_info *li; |
1033 | t_key cindex; | |
1034 | ||
1035 | pos = 0; | |
c877efb2 | 1036 | n = t->trie; |
19baf839 | 1037 | |
c877efb2 SH |
1038 | /* If we point to NULL, stop. Either the tree is empty and we should |
1039 | * just put a new leaf in if, or we have reached an empty child slot, | |
19baf839 | 1040 | * and we should just put our new leaf in that. |
c877efb2 SH |
1041 | * If we point to a T_TNODE, check if it matches our key. Note that |
1042 | * a T_TNODE might be skipping any number of bits - its 'pos' need | |
19baf839 RO |
1043 | * not be the parent's 'pos'+'bits'! |
1044 | * | |
c877efb2 | 1045 | * If it does match the current key, get pos/bits from it, extract |
19baf839 RO |
1046 | * the index from our key, push the T_TNODE and walk the tree. |
1047 | * | |
1048 | * If it doesn't, we have to replace it with a new T_TNODE. | |
1049 | * | |
c877efb2 SH |
1050 | * If we point to a T_LEAF, it might or might not have the same key |
1051 | * as we do. If it does, just change the value, update the T_LEAF's | |
1052 | * value, and return it. | |
19baf839 RO |
1053 | * If it doesn't, we need to replace it with a T_TNODE. |
1054 | */ | |
1055 | ||
1056 | while (n != NULL && NODE_TYPE(n) == T_TNODE) { | |
1057 | tn = (struct tnode *) n; | |
91b9a277 | 1058 | |
c877efb2 | 1059 | check_tnode(tn); |
91b9a277 | 1060 | |
c877efb2 | 1061 | if (tkey_sub_equals(tn->key, pos, tn->pos-pos, key)) { |
19baf839 | 1062 | tp = tn; |
91b9a277 | 1063 | pos = tn->pos + tn->bits; |
a07f5f50 SH |
1064 | n = tnode_get_child(tn, |
1065 | tkey_extract_bits(key, | |
1066 | tn->pos, | |
1067 | tn->bits)); | |
19baf839 | 1068 | |
06801916 | 1069 | BUG_ON(n && node_parent(n) != tn); |
91b9a277 | 1070 | } else |
19baf839 RO |
1071 | break; |
1072 | } | |
1073 | ||
1074 | /* | |
1075 | * n ----> NULL, LEAF or TNODE | |
1076 | * | |
c877efb2 | 1077 | * tp is n's (parent) ----> NULL or TNODE |
19baf839 RO |
1078 | */ |
1079 | ||
91b9a277 | 1080 | BUG_ON(tp && IS_LEAF(tp)); |
19baf839 RO |
1081 | |
1082 | /* Case 1: n is a leaf. Compare prefixes */ | |
1083 | ||
c877efb2 | 1084 | if (n != NULL && IS_LEAF(n) && tkey_equals(key, n->key)) { |
c95aaf9a | 1085 | l = (struct leaf *) n; |
19baf839 | 1086 | li = leaf_info_new(plen); |
91b9a277 | 1087 | |
fea86ad8 SH |
1088 | if (!li) |
1089 | return NULL; | |
19baf839 RO |
1090 | |
1091 | fa_head = &li->falh; | |
1092 | insert_leaf_info(&l->list, li); | |
1093 | goto done; | |
1094 | } | |
19baf839 RO |
1095 | l = leaf_new(); |
1096 | ||
fea86ad8 SH |
1097 | if (!l) |
1098 | return NULL; | |
19baf839 RO |
1099 | |
1100 | l->key = key; | |
1101 | li = leaf_info_new(plen); | |
1102 | ||
c877efb2 | 1103 | if (!li) { |
387a5487 | 1104 | free_leaf(l); |
fea86ad8 | 1105 | return NULL; |
f835e471 | 1106 | } |
19baf839 RO |
1107 | |
1108 | fa_head = &li->falh; | |
1109 | insert_leaf_info(&l->list, li); | |
1110 | ||
19baf839 | 1111 | if (t->trie && n == NULL) { |
91b9a277 | 1112 | /* Case 2: n is NULL, and will just insert a new leaf */ |
19baf839 | 1113 | |
06801916 | 1114 | node_set_parent((struct node *)l, tp); |
19baf839 | 1115 | |
91b9a277 OJ |
1116 | cindex = tkey_extract_bits(key, tp->pos, tp->bits); |
1117 | put_child(t, (struct tnode *)tp, cindex, (struct node *)l); | |
1118 | } else { | |
1119 | /* Case 3: n is a LEAF or a TNODE and the key doesn't match. */ | |
c877efb2 SH |
1120 | /* |
1121 | * Add a new tnode here | |
19baf839 RO |
1122 | * first tnode need some special handling |
1123 | */ | |
1124 | ||
1125 | if (tp) | |
91b9a277 | 1126 | pos = tp->pos+tp->bits; |
19baf839 | 1127 | else |
91b9a277 OJ |
1128 | pos = 0; |
1129 | ||
c877efb2 | 1130 | if (n) { |
19baf839 RO |
1131 | newpos = tkey_mismatch(key, pos, n->key); |
1132 | tn = tnode_new(n->key, newpos, 1); | |
91b9a277 | 1133 | } else { |
19baf839 | 1134 | newpos = 0; |
c877efb2 | 1135 | tn = tnode_new(key, newpos, 1); /* First tnode */ |
19baf839 | 1136 | } |
19baf839 | 1137 | |
c877efb2 | 1138 | if (!tn) { |
f835e471 | 1139 | free_leaf_info(li); |
387a5487 | 1140 | free_leaf(l); |
fea86ad8 | 1141 | return NULL; |
91b9a277 OJ |
1142 | } |
1143 | ||
06801916 | 1144 | node_set_parent((struct node *)tn, tp); |
19baf839 | 1145 | |
91b9a277 | 1146 | missbit = tkey_extract_bits(key, newpos, 1); |
19baf839 RO |
1147 | put_child(t, tn, missbit, (struct node *)l); |
1148 | put_child(t, tn, 1-missbit, n); | |
1149 | ||
c877efb2 | 1150 | if (tp) { |
19baf839 | 1151 | cindex = tkey_extract_bits(key, tp->pos, tp->bits); |
a07f5f50 SH |
1152 | put_child(t, (struct tnode *)tp, cindex, |
1153 | (struct node *)tn); | |
91b9a277 | 1154 | } else { |
a07f5f50 | 1155 | rcu_assign_pointer(t->trie, (struct node *)tn); |
19baf839 RO |
1156 | tp = tn; |
1157 | } | |
1158 | } | |
91b9a277 OJ |
1159 | |
1160 | if (tp && tp->pos + tp->bits > 32) | |
a07f5f50 SH |
1161 | pr_warning("fib_trie" |
1162 | " tp=%p pos=%d, bits=%d, key=%0x plen=%d\n", | |
1163 | tp, tp->pos, tp->bits, key, plen); | |
91b9a277 | 1164 | |
19baf839 | 1165 | /* Rebalance the trie */ |
2373ce1c | 1166 | |
7b85576d | 1167 | trie_rebalance(t, tp); |
f835e471 | 1168 | done: |
19baf839 RO |
1169 | return fa_head; |
1170 | } | |
1171 | ||
d562f1f8 RO |
1172 | /* |
1173 | * Caller must hold RTNL. | |
1174 | */ | |
16c6cf8b | 1175 | int fib_table_insert(struct fib_table *tb, struct fib_config *cfg) |
19baf839 RO |
1176 | { |
1177 | struct trie *t = (struct trie *) tb->tb_data; | |
1178 | struct fib_alias *fa, *new_fa; | |
c877efb2 | 1179 | struct list_head *fa_head = NULL; |
19baf839 | 1180 | struct fib_info *fi; |
4e902c57 TG |
1181 | int plen = cfg->fc_dst_len; |
1182 | u8 tos = cfg->fc_tos; | |
19baf839 RO |
1183 | u32 key, mask; |
1184 | int err; | |
1185 | struct leaf *l; | |
1186 | ||
1187 | if (plen > 32) | |
1188 | return -EINVAL; | |
1189 | ||
4e902c57 | 1190 | key = ntohl(cfg->fc_dst); |
19baf839 | 1191 | |
2dfe55b4 | 1192 | pr_debug("Insert table=%u %08x/%d\n", tb->tb_id, key, plen); |
19baf839 | 1193 | |
91b9a277 | 1194 | mask = ntohl(inet_make_mask(plen)); |
19baf839 | 1195 | |
c877efb2 | 1196 | if (key & ~mask) |
19baf839 RO |
1197 | return -EINVAL; |
1198 | ||
1199 | key = key & mask; | |
1200 | ||
4e902c57 TG |
1201 | fi = fib_create_info(cfg); |
1202 | if (IS_ERR(fi)) { | |
1203 | err = PTR_ERR(fi); | |
19baf839 | 1204 | goto err; |
4e902c57 | 1205 | } |
19baf839 RO |
1206 | |
1207 | l = fib_find_node(t, key); | |
c877efb2 | 1208 | fa = NULL; |
19baf839 | 1209 | |
c877efb2 | 1210 | if (l) { |
19baf839 RO |
1211 | fa_head = get_fa_head(l, plen); |
1212 | fa = fib_find_alias(fa_head, tos, fi->fib_priority); | |
1213 | } | |
1214 | ||
1215 | /* Now fa, if non-NULL, points to the first fib alias | |
1216 | * with the same keys [prefix,tos,priority], if such key already | |
1217 | * exists or to the node before which we will insert new one. | |
1218 | * | |
1219 | * If fa is NULL, we will need to allocate a new one and | |
1220 | * insert to the head of f. | |
1221 | * | |
1222 | * If f is NULL, no fib node matched the destination key | |
1223 | * and we need to allocate a new one of those as well. | |
1224 | */ | |
1225 | ||
936f6f8e JA |
1226 | if (fa && fa->fa_tos == tos && |
1227 | fa->fa_info->fib_priority == fi->fib_priority) { | |
1228 | struct fib_alias *fa_first, *fa_match; | |
19baf839 RO |
1229 | |
1230 | err = -EEXIST; | |
4e902c57 | 1231 | if (cfg->fc_nlflags & NLM_F_EXCL) |
19baf839 RO |
1232 | goto out; |
1233 | ||
936f6f8e JA |
1234 | /* We have 2 goals: |
1235 | * 1. Find exact match for type, scope, fib_info to avoid | |
1236 | * duplicate routes | |
1237 | * 2. Find next 'fa' (or head), NLM_F_APPEND inserts before it | |
1238 | */ | |
1239 | fa_match = NULL; | |
1240 | fa_first = fa; | |
1241 | fa = list_entry(fa->fa_list.prev, struct fib_alias, fa_list); | |
1242 | list_for_each_entry_continue(fa, fa_head, fa_list) { | |
1243 | if (fa->fa_tos != tos) | |
1244 | break; | |
1245 | if (fa->fa_info->fib_priority != fi->fib_priority) | |
1246 | break; | |
1247 | if (fa->fa_type == cfg->fc_type && | |
1248 | fa->fa_scope == cfg->fc_scope && | |
1249 | fa->fa_info == fi) { | |
1250 | fa_match = fa; | |
1251 | break; | |
1252 | } | |
1253 | } | |
1254 | ||
4e902c57 | 1255 | if (cfg->fc_nlflags & NLM_F_REPLACE) { |
19baf839 RO |
1256 | struct fib_info *fi_drop; |
1257 | u8 state; | |
1258 | ||
936f6f8e JA |
1259 | fa = fa_first; |
1260 | if (fa_match) { | |
1261 | if (fa == fa_match) | |
1262 | err = 0; | |
6725033f | 1263 | goto out; |
936f6f8e | 1264 | } |
2373ce1c | 1265 | err = -ENOBUFS; |
e94b1766 | 1266 | new_fa = kmem_cache_alloc(fn_alias_kmem, GFP_KERNEL); |
2373ce1c RO |
1267 | if (new_fa == NULL) |
1268 | goto out; | |
19baf839 RO |
1269 | |
1270 | fi_drop = fa->fa_info; | |
2373ce1c RO |
1271 | new_fa->fa_tos = fa->fa_tos; |
1272 | new_fa->fa_info = fi; | |
4e902c57 TG |
1273 | new_fa->fa_type = cfg->fc_type; |
1274 | new_fa->fa_scope = cfg->fc_scope; | |
19baf839 | 1275 | state = fa->fa_state; |
936f6f8e | 1276 | new_fa->fa_state = state & ~FA_S_ACCESSED; |
19baf839 | 1277 | |
2373ce1c RO |
1278 | list_replace_rcu(&fa->fa_list, &new_fa->fa_list); |
1279 | alias_free_mem_rcu(fa); | |
19baf839 RO |
1280 | |
1281 | fib_release_info(fi_drop); | |
1282 | if (state & FA_S_ACCESSED) | |
76e6ebfb | 1283 | rt_cache_flush(cfg->fc_nlinfo.nl_net, -1); |
b8f55831 MK |
1284 | rtmsg_fib(RTM_NEWROUTE, htonl(key), new_fa, plen, |
1285 | tb->tb_id, &cfg->fc_nlinfo, NLM_F_REPLACE); | |
19baf839 | 1286 | |
91b9a277 | 1287 | goto succeeded; |
19baf839 RO |
1288 | } |
1289 | /* Error if we find a perfect match which | |
1290 | * uses the same scope, type, and nexthop | |
1291 | * information. | |
1292 | */ | |
936f6f8e JA |
1293 | if (fa_match) |
1294 | goto out; | |
a07f5f50 | 1295 | |
4e902c57 | 1296 | if (!(cfg->fc_nlflags & NLM_F_APPEND)) |
936f6f8e | 1297 | fa = fa_first; |
19baf839 RO |
1298 | } |
1299 | err = -ENOENT; | |
4e902c57 | 1300 | if (!(cfg->fc_nlflags & NLM_F_CREATE)) |
19baf839 RO |
1301 | goto out; |
1302 | ||
1303 | err = -ENOBUFS; | |
e94b1766 | 1304 | new_fa = kmem_cache_alloc(fn_alias_kmem, GFP_KERNEL); |
19baf839 RO |
1305 | if (new_fa == NULL) |
1306 | goto out; | |
1307 | ||
1308 | new_fa->fa_info = fi; | |
1309 | new_fa->fa_tos = tos; | |
4e902c57 TG |
1310 | new_fa->fa_type = cfg->fc_type; |
1311 | new_fa->fa_scope = cfg->fc_scope; | |
19baf839 | 1312 | new_fa->fa_state = 0; |
19baf839 RO |
1313 | /* |
1314 | * Insert new entry to the list. | |
1315 | */ | |
1316 | ||
c877efb2 | 1317 | if (!fa_head) { |
fea86ad8 SH |
1318 | fa_head = fib_insert_node(t, key, plen); |
1319 | if (unlikely(!fa_head)) { | |
1320 | err = -ENOMEM; | |
f835e471 | 1321 | goto out_free_new_fa; |
fea86ad8 | 1322 | } |
f835e471 | 1323 | } |
19baf839 | 1324 | |
2373ce1c RO |
1325 | list_add_tail_rcu(&new_fa->fa_list, |
1326 | (fa ? &fa->fa_list : fa_head)); | |
19baf839 | 1327 | |
76e6ebfb | 1328 | rt_cache_flush(cfg->fc_nlinfo.nl_net, -1); |
4e902c57 | 1329 | rtmsg_fib(RTM_NEWROUTE, htonl(key), new_fa, plen, tb->tb_id, |
b8f55831 | 1330 | &cfg->fc_nlinfo, 0); |
19baf839 RO |
1331 | succeeded: |
1332 | return 0; | |
f835e471 RO |
1333 | |
1334 | out_free_new_fa: | |
1335 | kmem_cache_free(fn_alias_kmem, new_fa); | |
19baf839 RO |
1336 | out: |
1337 | fib_release_info(fi); | |
91b9a277 | 1338 | err: |
19baf839 RO |
1339 | return err; |
1340 | } | |
1341 | ||
772cb712 | 1342 | /* should be called with rcu_read_lock */ |
a07f5f50 SH |
1343 | static int check_leaf(struct trie *t, struct leaf *l, |
1344 | t_key key, const struct flowi *flp, | |
ebc0ffae | 1345 | struct fib_result *res, int fib_flags) |
19baf839 | 1346 | { |
19baf839 RO |
1347 | struct leaf_info *li; |
1348 | struct hlist_head *hhead = &l->list; | |
1349 | struct hlist_node *node; | |
c877efb2 | 1350 | |
2373ce1c | 1351 | hlist_for_each_entry_rcu(li, node, hhead, hlist) { |
a07f5f50 SH |
1352 | int err; |
1353 | int plen = li->plen; | |
1354 | __be32 mask = inet_make_mask(plen); | |
1355 | ||
888454c5 | 1356 | if (l->key != (key & ntohl(mask))) |
19baf839 RO |
1357 | continue; |
1358 | ||
ebc0ffae | 1359 | err = fib_semantic_match(&li->falh, flp, res, plen, fib_flags); |
a07f5f50 | 1360 | |
19baf839 | 1361 | #ifdef CONFIG_IP_FIB_TRIE_STATS |
a07f5f50 | 1362 | if (err <= 0) |
19baf839 | 1363 | t->stats.semantic_match_passed++; |
a07f5f50 SH |
1364 | else |
1365 | t->stats.semantic_match_miss++; | |
19baf839 | 1366 | #endif |
a07f5f50 | 1367 | if (err <= 0) |
2e655571 | 1368 | return err; |
19baf839 | 1369 | } |
a07f5f50 | 1370 | |
2e655571 | 1371 | return 1; |
19baf839 RO |
1372 | } |
1373 | ||
16c6cf8b | 1374 | int fib_table_lookup(struct fib_table *tb, const struct flowi *flp, |
ebc0ffae | 1375 | struct fib_result *res, int fib_flags) |
19baf839 RO |
1376 | { |
1377 | struct trie *t = (struct trie *) tb->tb_data; | |
2e655571 | 1378 | int ret; |
19baf839 RO |
1379 | struct node *n; |
1380 | struct tnode *pn; | |
1381 | int pos, bits; | |
91b9a277 | 1382 | t_key key = ntohl(flp->fl4_dst); |
19baf839 RO |
1383 | int chopped_off; |
1384 | t_key cindex = 0; | |
1385 | int current_prefix_length = KEYLENGTH; | |
91b9a277 | 1386 | struct tnode *cn; |
874ffa8f | 1387 | t_key pref_mismatch; |
91b9a277 | 1388 | |
2373ce1c | 1389 | rcu_read_lock(); |
91b9a277 | 1390 | |
2373ce1c | 1391 | n = rcu_dereference(t->trie); |
c877efb2 | 1392 | if (!n) |
19baf839 RO |
1393 | goto failed; |
1394 | ||
1395 | #ifdef CONFIG_IP_FIB_TRIE_STATS | |
1396 | t->stats.gets++; | |
1397 | #endif | |
1398 | ||
1399 | /* Just a leaf? */ | |
1400 | if (IS_LEAF(n)) { | |
ebc0ffae | 1401 | ret = check_leaf(t, (struct leaf *)n, key, flp, res, fib_flags); |
a07f5f50 | 1402 | goto found; |
19baf839 | 1403 | } |
a07f5f50 | 1404 | |
19baf839 RO |
1405 | pn = (struct tnode *) n; |
1406 | chopped_off = 0; | |
c877efb2 | 1407 | |
91b9a277 | 1408 | while (pn) { |
19baf839 RO |
1409 | pos = pn->pos; |
1410 | bits = pn->bits; | |
1411 | ||
c877efb2 | 1412 | if (!chopped_off) |
ab66b4a7 SH |
1413 | cindex = tkey_extract_bits(mask_pfx(key, current_prefix_length), |
1414 | pos, bits); | |
19baf839 | 1415 | |
b902e573 | 1416 | n = tnode_get_child_rcu(pn, cindex); |
19baf839 RO |
1417 | |
1418 | if (n == NULL) { | |
1419 | #ifdef CONFIG_IP_FIB_TRIE_STATS | |
1420 | t->stats.null_node_hit++; | |
1421 | #endif | |
1422 | goto backtrace; | |
1423 | } | |
1424 | ||
91b9a277 | 1425 | if (IS_LEAF(n)) { |
ebc0ffae | 1426 | ret = check_leaf(t, (struct leaf *)n, key, flp, res, fib_flags); |
2e655571 | 1427 | if (ret > 0) |
91b9a277 | 1428 | goto backtrace; |
a07f5f50 | 1429 | goto found; |
91b9a277 OJ |
1430 | } |
1431 | ||
91b9a277 | 1432 | cn = (struct tnode *)n; |
19baf839 | 1433 | |
91b9a277 OJ |
1434 | /* |
1435 | * It's a tnode, and we can do some extra checks here if we | |
1436 | * like, to avoid descending into a dead-end branch. | |
1437 | * This tnode is in the parent's child array at index | |
1438 | * key[p_pos..p_pos+p_bits] but potentially with some bits | |
1439 | * chopped off, so in reality the index may be just a | |
1440 | * subprefix, padded with zero at the end. | |
1441 | * We can also take a look at any skipped bits in this | |
1442 | * tnode - everything up to p_pos is supposed to be ok, | |
1443 | * and the non-chopped bits of the index (se previous | |
1444 | * paragraph) are also guaranteed ok, but the rest is | |
1445 | * considered unknown. | |
1446 | * | |
1447 | * The skipped bits are key[pos+bits..cn->pos]. | |
1448 | */ | |
19baf839 | 1449 | |
91b9a277 OJ |
1450 | /* If current_prefix_length < pos+bits, we are already doing |
1451 | * actual prefix matching, which means everything from | |
1452 | * pos+(bits-chopped_off) onward must be zero along some | |
1453 | * branch of this subtree - otherwise there is *no* valid | |
1454 | * prefix present. Here we can only check the skipped | |
1455 | * bits. Remember, since we have already indexed into the | |
1456 | * parent's child array, we know that the bits we chopped of | |
1457 | * *are* zero. | |
1458 | */ | |
19baf839 | 1459 | |
a07f5f50 SH |
1460 | /* NOTA BENE: Checking only skipped bits |
1461 | for the new node here */ | |
19baf839 | 1462 | |
91b9a277 OJ |
1463 | if (current_prefix_length < pos+bits) { |
1464 | if (tkey_extract_bits(cn->key, current_prefix_length, | |
a07f5f50 SH |
1465 | cn->pos - current_prefix_length) |
1466 | || !(cn->child[0])) | |
91b9a277 OJ |
1467 | goto backtrace; |
1468 | } | |
19baf839 | 1469 | |
91b9a277 OJ |
1470 | /* |
1471 | * If chopped_off=0, the index is fully validated and we | |
1472 | * only need to look at the skipped bits for this, the new, | |
1473 | * tnode. What we actually want to do is to find out if | |
1474 | * these skipped bits match our key perfectly, or if we will | |
1475 | * have to count on finding a matching prefix further down, | |
1476 | * because if we do, we would like to have some way of | |
1477 | * verifying the existence of such a prefix at this point. | |
1478 | */ | |
19baf839 | 1479 | |
91b9a277 OJ |
1480 | /* The only thing we can do at this point is to verify that |
1481 | * any such matching prefix can indeed be a prefix to our | |
1482 | * key, and if the bits in the node we are inspecting that | |
1483 | * do not match our key are not ZERO, this cannot be true. | |
1484 | * Thus, find out where there is a mismatch (before cn->pos) | |
1485 | * and verify that all the mismatching bits are zero in the | |
1486 | * new tnode's key. | |
1487 | */ | |
19baf839 | 1488 | |
a07f5f50 SH |
1489 | /* |
1490 | * Note: We aren't very concerned about the piece of | |
1491 | * the key that precede pn->pos+pn->bits, since these | |
1492 | * have already been checked. The bits after cn->pos | |
1493 | * aren't checked since these are by definition | |
1494 | * "unknown" at this point. Thus, what we want to see | |
1495 | * is if we are about to enter the "prefix matching" | |
1496 | * state, and in that case verify that the skipped | |
1497 | * bits that will prevail throughout this subtree are | |
1498 | * zero, as they have to be if we are to find a | |
1499 | * matching prefix. | |
91b9a277 OJ |
1500 | */ |
1501 | ||
874ffa8f | 1502 | pref_mismatch = mask_pfx(cn->key ^ key, cn->pos); |
91b9a277 | 1503 | |
a07f5f50 SH |
1504 | /* |
1505 | * In short: If skipped bits in this node do not match | |
1506 | * the search key, enter the "prefix matching" | |
1507 | * state.directly. | |
91b9a277 OJ |
1508 | */ |
1509 | if (pref_mismatch) { | |
874ffa8f | 1510 | int mp = KEYLENGTH - fls(pref_mismatch); |
91b9a277 | 1511 | |
874ffa8f | 1512 | if (tkey_extract_bits(cn->key, mp, cn->pos - mp) != 0) |
91b9a277 OJ |
1513 | goto backtrace; |
1514 | ||
1515 | if (current_prefix_length >= cn->pos) | |
1516 | current_prefix_length = mp; | |
c877efb2 | 1517 | } |
a07f5f50 | 1518 | |
91b9a277 OJ |
1519 | pn = (struct tnode *)n; /* Descend */ |
1520 | chopped_off = 0; | |
1521 | continue; | |
1522 | ||
19baf839 RO |
1523 | backtrace: |
1524 | chopped_off++; | |
1525 | ||
1526 | /* As zero don't change the child key (cindex) */ | |
a07f5f50 SH |
1527 | while ((chopped_off <= pn->bits) |
1528 | && !(cindex & (1<<(chopped_off-1)))) | |
19baf839 | 1529 | chopped_off++; |
19baf839 RO |
1530 | |
1531 | /* Decrease current_... with bits chopped off */ | |
1532 | if (current_prefix_length > pn->pos + pn->bits - chopped_off) | |
a07f5f50 SH |
1533 | current_prefix_length = pn->pos + pn->bits |
1534 | - chopped_off; | |
91b9a277 | 1535 | |
19baf839 | 1536 | /* |
c877efb2 | 1537 | * Either we do the actual chop off according or if we have |
19baf839 RO |
1538 | * chopped off all bits in this tnode walk up to our parent. |
1539 | */ | |
1540 | ||
91b9a277 | 1541 | if (chopped_off <= pn->bits) { |
19baf839 | 1542 | cindex &= ~(1 << (chopped_off-1)); |
91b9a277 | 1543 | } else { |
b902e573 | 1544 | struct tnode *parent = node_parent_rcu((struct node *) pn); |
06801916 | 1545 | if (!parent) |
19baf839 | 1546 | goto failed; |
91b9a277 | 1547 | |
19baf839 | 1548 | /* Get Child's index */ |
06801916 SH |
1549 | cindex = tkey_extract_bits(pn->key, parent->pos, parent->bits); |
1550 | pn = parent; | |
19baf839 RO |
1551 | chopped_off = 0; |
1552 | ||
1553 | #ifdef CONFIG_IP_FIB_TRIE_STATS | |
1554 | t->stats.backtrack++; | |
1555 | #endif | |
1556 | goto backtrace; | |
c877efb2 | 1557 | } |
19baf839 RO |
1558 | } |
1559 | failed: | |
c877efb2 | 1560 | ret = 1; |
19baf839 | 1561 | found: |
2373ce1c | 1562 | rcu_read_unlock(); |
19baf839 RO |
1563 | return ret; |
1564 | } | |
1565 | ||
9195bef7 SH |
1566 | /* |
1567 | * Remove the leaf and return parent. | |
1568 | */ | |
1569 | static void trie_leaf_remove(struct trie *t, struct leaf *l) | |
19baf839 | 1570 | { |
9195bef7 | 1571 | struct tnode *tp = node_parent((struct node *) l); |
c877efb2 | 1572 | |
9195bef7 | 1573 | pr_debug("entering trie_leaf_remove(%p)\n", l); |
19baf839 | 1574 | |
c877efb2 | 1575 | if (tp) { |
9195bef7 | 1576 | t_key cindex = tkey_extract_bits(l->key, tp->pos, tp->bits); |
19baf839 | 1577 | put_child(t, (struct tnode *)tp, cindex, NULL); |
7b85576d | 1578 | trie_rebalance(t, tp); |
91b9a277 | 1579 | } else |
2373ce1c | 1580 | rcu_assign_pointer(t->trie, NULL); |
19baf839 | 1581 | |
387a5487 | 1582 | free_leaf(l); |
19baf839 RO |
1583 | } |
1584 | ||
d562f1f8 RO |
1585 | /* |
1586 | * Caller must hold RTNL. | |
1587 | */ | |
16c6cf8b | 1588 | int fib_table_delete(struct fib_table *tb, struct fib_config *cfg) |
19baf839 RO |
1589 | { |
1590 | struct trie *t = (struct trie *) tb->tb_data; | |
1591 | u32 key, mask; | |
4e902c57 TG |
1592 | int plen = cfg->fc_dst_len; |
1593 | u8 tos = cfg->fc_tos; | |
19baf839 RO |
1594 | struct fib_alias *fa, *fa_to_delete; |
1595 | struct list_head *fa_head; | |
1596 | struct leaf *l; | |
91b9a277 OJ |
1597 | struct leaf_info *li; |
1598 | ||
c877efb2 | 1599 | if (plen > 32) |
19baf839 RO |
1600 | return -EINVAL; |
1601 | ||
4e902c57 | 1602 | key = ntohl(cfg->fc_dst); |
91b9a277 | 1603 | mask = ntohl(inet_make_mask(plen)); |
19baf839 | 1604 | |
c877efb2 | 1605 | if (key & ~mask) |
19baf839 RO |
1606 | return -EINVAL; |
1607 | ||
1608 | key = key & mask; | |
1609 | l = fib_find_node(t, key); | |
1610 | ||
c877efb2 | 1611 | if (!l) |
19baf839 RO |
1612 | return -ESRCH; |
1613 | ||
1614 | fa_head = get_fa_head(l, plen); | |
1615 | fa = fib_find_alias(fa_head, tos, 0); | |
1616 | ||
1617 | if (!fa) | |
1618 | return -ESRCH; | |
1619 | ||
0c7770c7 | 1620 | pr_debug("Deleting %08x/%d tos=%d t=%p\n", key, plen, tos, t); |
19baf839 RO |
1621 | |
1622 | fa_to_delete = NULL; | |
936f6f8e JA |
1623 | fa = list_entry(fa->fa_list.prev, struct fib_alias, fa_list); |
1624 | list_for_each_entry_continue(fa, fa_head, fa_list) { | |
19baf839 RO |
1625 | struct fib_info *fi = fa->fa_info; |
1626 | ||
1627 | if (fa->fa_tos != tos) | |
1628 | break; | |
1629 | ||
4e902c57 TG |
1630 | if ((!cfg->fc_type || fa->fa_type == cfg->fc_type) && |
1631 | (cfg->fc_scope == RT_SCOPE_NOWHERE || | |
1632 | fa->fa_scope == cfg->fc_scope) && | |
1633 | (!cfg->fc_protocol || | |
1634 | fi->fib_protocol == cfg->fc_protocol) && | |
1635 | fib_nh_match(cfg, fi) == 0) { | |
19baf839 RO |
1636 | fa_to_delete = fa; |
1637 | break; | |
1638 | } | |
1639 | } | |
1640 | ||
91b9a277 OJ |
1641 | if (!fa_to_delete) |
1642 | return -ESRCH; | |
19baf839 | 1643 | |
91b9a277 | 1644 | fa = fa_to_delete; |
4e902c57 | 1645 | rtmsg_fib(RTM_DELROUTE, htonl(key), fa, plen, tb->tb_id, |
b8f55831 | 1646 | &cfg->fc_nlinfo, 0); |
91b9a277 OJ |
1647 | |
1648 | l = fib_find_node(t, key); | |
772cb712 | 1649 | li = find_leaf_info(l, plen); |
19baf839 | 1650 | |
2373ce1c | 1651 | list_del_rcu(&fa->fa_list); |
19baf839 | 1652 | |
91b9a277 | 1653 | if (list_empty(fa_head)) { |
2373ce1c | 1654 | hlist_del_rcu(&li->hlist); |
91b9a277 | 1655 | free_leaf_info(li); |
2373ce1c | 1656 | } |
19baf839 | 1657 | |
91b9a277 | 1658 | if (hlist_empty(&l->list)) |
9195bef7 | 1659 | trie_leaf_remove(t, l); |
19baf839 | 1660 | |
91b9a277 | 1661 | if (fa->fa_state & FA_S_ACCESSED) |
76e6ebfb | 1662 | rt_cache_flush(cfg->fc_nlinfo.nl_net, -1); |
19baf839 | 1663 | |
2373ce1c RO |
1664 | fib_release_info(fa->fa_info); |
1665 | alias_free_mem_rcu(fa); | |
91b9a277 | 1666 | return 0; |
19baf839 RO |
1667 | } |
1668 | ||
ef3660ce | 1669 | static int trie_flush_list(struct list_head *head) |
19baf839 RO |
1670 | { |
1671 | struct fib_alias *fa, *fa_node; | |
1672 | int found = 0; | |
1673 | ||
1674 | list_for_each_entry_safe(fa, fa_node, head, fa_list) { | |
1675 | struct fib_info *fi = fa->fa_info; | |
19baf839 | 1676 | |
2373ce1c RO |
1677 | if (fi && (fi->fib_flags & RTNH_F_DEAD)) { |
1678 | list_del_rcu(&fa->fa_list); | |
1679 | fib_release_info(fa->fa_info); | |
1680 | alias_free_mem_rcu(fa); | |
19baf839 RO |
1681 | found++; |
1682 | } | |
1683 | } | |
1684 | return found; | |
1685 | } | |
1686 | ||
ef3660ce | 1687 | static int trie_flush_leaf(struct leaf *l) |
19baf839 RO |
1688 | { |
1689 | int found = 0; | |
1690 | struct hlist_head *lih = &l->list; | |
1691 | struct hlist_node *node, *tmp; | |
1692 | struct leaf_info *li = NULL; | |
1693 | ||
1694 | hlist_for_each_entry_safe(li, node, tmp, lih, hlist) { | |
ef3660ce | 1695 | found += trie_flush_list(&li->falh); |
19baf839 RO |
1696 | |
1697 | if (list_empty(&li->falh)) { | |
2373ce1c | 1698 | hlist_del_rcu(&li->hlist); |
19baf839 RO |
1699 | free_leaf_info(li); |
1700 | } | |
1701 | } | |
1702 | return found; | |
1703 | } | |
1704 | ||
82cfbb00 SH |
1705 | /* |
1706 | * Scan for the next right leaf starting at node p->child[idx] | |
1707 | * Since we have back pointer, no recursion necessary. | |
1708 | */ | |
1709 | static struct leaf *leaf_walk_rcu(struct tnode *p, struct node *c) | |
19baf839 | 1710 | { |
82cfbb00 SH |
1711 | do { |
1712 | t_key idx; | |
c877efb2 | 1713 | |
c877efb2 | 1714 | if (c) |
82cfbb00 | 1715 | idx = tkey_extract_bits(c->key, p->pos, p->bits) + 1; |
c877efb2 | 1716 | else |
82cfbb00 | 1717 | idx = 0; |
2373ce1c | 1718 | |
82cfbb00 SH |
1719 | while (idx < 1u << p->bits) { |
1720 | c = tnode_get_child_rcu(p, idx++); | |
2373ce1c | 1721 | if (!c) |
91b9a277 OJ |
1722 | continue; |
1723 | ||
82cfbb00 SH |
1724 | if (IS_LEAF(c)) { |
1725 | prefetch(p->child[idx]); | |
1726 | return (struct leaf *) c; | |
19baf839 | 1727 | } |
82cfbb00 SH |
1728 | |
1729 | /* Rescan start scanning in new node */ | |
1730 | p = (struct tnode *) c; | |
1731 | idx = 0; | |
19baf839 | 1732 | } |
82cfbb00 SH |
1733 | |
1734 | /* Node empty, walk back up to parent */ | |
91b9a277 | 1735 | c = (struct node *) p; |
a034ee3c | 1736 | } while ((p = node_parent_rcu(c)) != NULL); |
82cfbb00 SH |
1737 | |
1738 | return NULL; /* Root of trie */ | |
1739 | } | |
1740 | ||
82cfbb00 SH |
1741 | static struct leaf *trie_firstleaf(struct trie *t) |
1742 | { | |
a034ee3c | 1743 | struct tnode *n = (struct tnode *)rcu_dereference_rtnl(t->trie); |
82cfbb00 SH |
1744 | |
1745 | if (!n) | |
1746 | return NULL; | |
1747 | ||
1748 | if (IS_LEAF(n)) /* trie is just a leaf */ | |
1749 | return (struct leaf *) n; | |
1750 | ||
1751 | return leaf_walk_rcu(n, NULL); | |
1752 | } | |
1753 | ||
1754 | static struct leaf *trie_nextleaf(struct leaf *l) | |
1755 | { | |
1756 | struct node *c = (struct node *) l; | |
b902e573 | 1757 | struct tnode *p = node_parent_rcu(c); |
82cfbb00 SH |
1758 | |
1759 | if (!p) | |
1760 | return NULL; /* trie with just one leaf */ | |
1761 | ||
1762 | return leaf_walk_rcu(p, c); | |
19baf839 RO |
1763 | } |
1764 | ||
71d67e66 SH |
1765 | static struct leaf *trie_leafindex(struct trie *t, int index) |
1766 | { | |
1767 | struct leaf *l = trie_firstleaf(t); | |
1768 | ||
ec28cf73 | 1769 | while (l && index-- > 0) |
71d67e66 | 1770 | l = trie_nextleaf(l); |
ec28cf73 | 1771 | |
71d67e66 SH |
1772 | return l; |
1773 | } | |
1774 | ||
1775 | ||
d562f1f8 RO |
1776 | /* |
1777 | * Caller must hold RTNL. | |
1778 | */ | |
16c6cf8b | 1779 | int fib_table_flush(struct fib_table *tb) |
19baf839 RO |
1780 | { |
1781 | struct trie *t = (struct trie *) tb->tb_data; | |
9195bef7 | 1782 | struct leaf *l, *ll = NULL; |
82cfbb00 | 1783 | int found = 0; |
19baf839 | 1784 | |
82cfbb00 | 1785 | for (l = trie_firstleaf(t); l; l = trie_nextleaf(l)) { |
ef3660ce | 1786 | found += trie_flush_leaf(l); |
19baf839 RO |
1787 | |
1788 | if (ll && hlist_empty(&ll->list)) | |
9195bef7 | 1789 | trie_leaf_remove(t, ll); |
19baf839 RO |
1790 | ll = l; |
1791 | } | |
1792 | ||
1793 | if (ll && hlist_empty(&ll->list)) | |
9195bef7 | 1794 | trie_leaf_remove(t, ll); |
19baf839 | 1795 | |
0c7770c7 | 1796 | pr_debug("trie_flush found=%d\n", found); |
19baf839 RO |
1797 | return found; |
1798 | } | |
1799 | ||
4aa2c466 PE |
1800 | void fib_free_table(struct fib_table *tb) |
1801 | { | |
1802 | kfree(tb); | |
1803 | } | |
1804 | ||
16c6cf8b SH |
1805 | void fib_table_select_default(struct fib_table *tb, |
1806 | const struct flowi *flp, | |
1807 | struct fib_result *res) | |
19baf839 RO |
1808 | { |
1809 | struct trie *t = (struct trie *) tb->tb_data; | |
1810 | int order, last_idx; | |
1811 | struct fib_info *fi = NULL; | |
1812 | struct fib_info *last_resort; | |
1813 | struct fib_alias *fa = NULL; | |
1814 | struct list_head *fa_head; | |
1815 | struct leaf *l; | |
1816 | ||
1817 | last_idx = -1; | |
1818 | last_resort = NULL; | |
1819 | order = -1; | |
1820 | ||
2373ce1c | 1821 | rcu_read_lock(); |
c877efb2 | 1822 | |
19baf839 | 1823 | l = fib_find_node(t, 0); |
c877efb2 | 1824 | if (!l) |
19baf839 RO |
1825 | goto out; |
1826 | ||
1827 | fa_head = get_fa_head(l, 0); | |
c877efb2 | 1828 | if (!fa_head) |
19baf839 RO |
1829 | goto out; |
1830 | ||
c877efb2 | 1831 | if (list_empty(fa_head)) |
19baf839 RO |
1832 | goto out; |
1833 | ||
2373ce1c | 1834 | list_for_each_entry_rcu(fa, fa_head, fa_list) { |
19baf839 | 1835 | struct fib_info *next_fi = fa->fa_info; |
91b9a277 | 1836 | |
19baf839 RO |
1837 | if (fa->fa_scope != res->scope || |
1838 | fa->fa_type != RTN_UNICAST) | |
1839 | continue; | |
91b9a277 | 1840 | |
19baf839 RO |
1841 | if (next_fi->fib_priority > res->fi->fib_priority) |
1842 | break; | |
1843 | if (!next_fi->fib_nh[0].nh_gw || | |
1844 | next_fi->fib_nh[0].nh_scope != RT_SCOPE_LINK) | |
1845 | continue; | |
9b0c290e ED |
1846 | |
1847 | fib_alias_accessed(fa); | |
91b9a277 | 1848 | |
19baf839 RO |
1849 | if (fi == NULL) { |
1850 | if (next_fi != res->fi) | |
1851 | break; | |
1852 | } else if (!fib_detect_death(fi, order, &last_resort, | |
971b893e | 1853 | &last_idx, tb->tb_default)) { |
a2bbe682 | 1854 | fib_result_assign(res, fi); |
971b893e | 1855 | tb->tb_default = order; |
19baf839 RO |
1856 | goto out; |
1857 | } | |
1858 | fi = next_fi; | |
1859 | order++; | |
1860 | } | |
1861 | if (order <= 0 || fi == NULL) { | |
971b893e | 1862 | tb->tb_default = -1; |
19baf839 RO |
1863 | goto out; |
1864 | } | |
1865 | ||
971b893e DL |
1866 | if (!fib_detect_death(fi, order, &last_resort, &last_idx, |
1867 | tb->tb_default)) { | |
a2bbe682 | 1868 | fib_result_assign(res, fi); |
971b893e | 1869 | tb->tb_default = order; |
19baf839 RO |
1870 | goto out; |
1871 | } | |
a2bbe682 DL |
1872 | if (last_idx >= 0) |
1873 | fib_result_assign(res, last_resort); | |
971b893e DL |
1874 | tb->tb_default = last_idx; |
1875 | out: | |
2373ce1c | 1876 | rcu_read_unlock(); |
19baf839 RO |
1877 | } |
1878 | ||
a07f5f50 SH |
1879 | static int fn_trie_dump_fa(t_key key, int plen, struct list_head *fah, |
1880 | struct fib_table *tb, | |
19baf839 RO |
1881 | struct sk_buff *skb, struct netlink_callback *cb) |
1882 | { | |
1883 | int i, s_i; | |
1884 | struct fib_alias *fa; | |
32ab5f80 | 1885 | __be32 xkey = htonl(key); |
19baf839 | 1886 | |
71d67e66 | 1887 | s_i = cb->args[5]; |
19baf839 RO |
1888 | i = 0; |
1889 | ||
2373ce1c RO |
1890 | /* rcu_read_lock is hold by caller */ |
1891 | ||
1892 | list_for_each_entry_rcu(fa, fah, fa_list) { | |
19baf839 RO |
1893 | if (i < s_i) { |
1894 | i++; | |
1895 | continue; | |
1896 | } | |
19baf839 RO |
1897 | |
1898 | if (fib_dump_info(skb, NETLINK_CB(cb->skb).pid, | |
1899 | cb->nlh->nlmsg_seq, | |
1900 | RTM_NEWROUTE, | |
1901 | tb->tb_id, | |
1902 | fa->fa_type, | |
1903 | fa->fa_scope, | |
be403ea1 | 1904 | xkey, |
19baf839 RO |
1905 | plen, |
1906 | fa->fa_tos, | |
64347f78 | 1907 | fa->fa_info, NLM_F_MULTI) < 0) { |
71d67e66 | 1908 | cb->args[5] = i; |
19baf839 | 1909 | return -1; |
91b9a277 | 1910 | } |
19baf839 RO |
1911 | i++; |
1912 | } | |
71d67e66 | 1913 | cb->args[5] = i; |
19baf839 RO |
1914 | return skb->len; |
1915 | } | |
1916 | ||
a88ee229 SH |
1917 | static int fn_trie_dump_leaf(struct leaf *l, struct fib_table *tb, |
1918 | struct sk_buff *skb, struct netlink_callback *cb) | |
19baf839 | 1919 | { |
a88ee229 SH |
1920 | struct leaf_info *li; |
1921 | struct hlist_node *node; | |
1922 | int i, s_i; | |
19baf839 | 1923 | |
71d67e66 | 1924 | s_i = cb->args[4]; |
a88ee229 | 1925 | i = 0; |
19baf839 | 1926 | |
a88ee229 SH |
1927 | /* rcu_read_lock is hold by caller */ |
1928 | hlist_for_each_entry_rcu(li, node, &l->list, hlist) { | |
1929 | if (i < s_i) { | |
1930 | i++; | |
19baf839 | 1931 | continue; |
a88ee229 | 1932 | } |
91b9a277 | 1933 | |
a88ee229 | 1934 | if (i > s_i) |
71d67e66 | 1935 | cb->args[5] = 0; |
19baf839 | 1936 | |
a88ee229 | 1937 | if (list_empty(&li->falh)) |
19baf839 RO |
1938 | continue; |
1939 | ||
a88ee229 | 1940 | if (fn_trie_dump_fa(l->key, li->plen, &li->falh, tb, skb, cb) < 0) { |
71d67e66 | 1941 | cb->args[4] = i; |
19baf839 RO |
1942 | return -1; |
1943 | } | |
a88ee229 | 1944 | i++; |
19baf839 | 1945 | } |
a88ee229 | 1946 | |
71d67e66 | 1947 | cb->args[4] = i; |
19baf839 RO |
1948 | return skb->len; |
1949 | } | |
1950 | ||
16c6cf8b SH |
1951 | int fib_table_dump(struct fib_table *tb, struct sk_buff *skb, |
1952 | struct netlink_callback *cb) | |
19baf839 | 1953 | { |
a88ee229 | 1954 | struct leaf *l; |
19baf839 | 1955 | struct trie *t = (struct trie *) tb->tb_data; |
d5ce8a0e | 1956 | t_key key = cb->args[2]; |
71d67e66 | 1957 | int count = cb->args[3]; |
19baf839 | 1958 | |
2373ce1c | 1959 | rcu_read_lock(); |
d5ce8a0e SH |
1960 | /* Dump starting at last key. |
1961 | * Note: 0.0.0.0/0 (ie default) is first key. | |
1962 | */ | |
71d67e66 | 1963 | if (count == 0) |
d5ce8a0e SH |
1964 | l = trie_firstleaf(t); |
1965 | else { | |
71d67e66 SH |
1966 | /* Normally, continue from last key, but if that is missing |
1967 | * fallback to using slow rescan | |
1968 | */ | |
d5ce8a0e | 1969 | l = fib_find_node(t, key); |
71d67e66 SH |
1970 | if (!l) |
1971 | l = trie_leafindex(t, count); | |
d5ce8a0e | 1972 | } |
a88ee229 | 1973 | |
d5ce8a0e SH |
1974 | while (l) { |
1975 | cb->args[2] = l->key; | |
a88ee229 | 1976 | if (fn_trie_dump_leaf(l, tb, skb, cb) < 0) { |
71d67e66 | 1977 | cb->args[3] = count; |
a88ee229 | 1978 | rcu_read_unlock(); |
a88ee229 | 1979 | return -1; |
19baf839 | 1980 | } |
d5ce8a0e | 1981 | |
71d67e66 | 1982 | ++count; |
d5ce8a0e | 1983 | l = trie_nextleaf(l); |
71d67e66 SH |
1984 | memset(&cb->args[4], 0, |
1985 | sizeof(cb->args) - 4*sizeof(cb->args[0])); | |
19baf839 | 1986 | } |
71d67e66 | 1987 | cb->args[3] = count; |
2373ce1c | 1988 | rcu_read_unlock(); |
a88ee229 | 1989 | |
19baf839 | 1990 | return skb->len; |
19baf839 RO |
1991 | } |
1992 | ||
7f9b8052 SH |
1993 | void __init fib_hash_init(void) |
1994 | { | |
a07f5f50 SH |
1995 | fn_alias_kmem = kmem_cache_create("ip_fib_alias", |
1996 | sizeof(struct fib_alias), | |
bc3c8c1e SH |
1997 | 0, SLAB_PANIC, NULL); |
1998 | ||
1999 | trie_leaf_kmem = kmem_cache_create("ip_fib_trie", | |
2000 | max(sizeof(struct leaf), | |
2001 | sizeof(struct leaf_info)), | |
2002 | 0, SLAB_PANIC, NULL); | |
7f9b8052 | 2003 | } |
19baf839 | 2004 | |
7f9b8052 SH |
2005 | |
2006 | /* Fix more generic FIB names for init later */ | |
2007 | struct fib_table *fib_hash_table(u32 id) | |
19baf839 RO |
2008 | { |
2009 | struct fib_table *tb; | |
2010 | struct trie *t; | |
2011 | ||
19baf839 RO |
2012 | tb = kmalloc(sizeof(struct fib_table) + sizeof(struct trie), |
2013 | GFP_KERNEL); | |
2014 | if (tb == NULL) | |
2015 | return NULL; | |
2016 | ||
2017 | tb->tb_id = id; | |
971b893e | 2018 | tb->tb_default = -1; |
19baf839 RO |
2019 | |
2020 | t = (struct trie *) tb->tb_data; | |
c28a1cf4 | 2021 | memset(t, 0, sizeof(*t)); |
19baf839 | 2022 | |
19baf839 | 2023 | if (id == RT_TABLE_LOCAL) |
a07f5f50 | 2024 | pr_info("IPv4 FIB: Using LC-trie version %s\n", VERSION); |
19baf839 RO |
2025 | |
2026 | return tb; | |
2027 | } | |
2028 | ||
cb7b593c SH |
2029 | #ifdef CONFIG_PROC_FS |
2030 | /* Depth first Trie walk iterator */ | |
2031 | struct fib_trie_iter { | |
1c340b2f | 2032 | struct seq_net_private p; |
3d3b2d25 | 2033 | struct fib_table *tb; |
cb7b593c | 2034 | struct tnode *tnode; |
a034ee3c ED |
2035 | unsigned int index; |
2036 | unsigned int depth; | |
cb7b593c | 2037 | }; |
19baf839 | 2038 | |
cb7b593c | 2039 | static struct node *fib_trie_get_next(struct fib_trie_iter *iter) |
19baf839 | 2040 | { |
cb7b593c | 2041 | struct tnode *tn = iter->tnode; |
a034ee3c | 2042 | unsigned int cindex = iter->index; |
cb7b593c | 2043 | struct tnode *p; |
19baf839 | 2044 | |
6640e697 EB |
2045 | /* A single entry routing table */ |
2046 | if (!tn) | |
2047 | return NULL; | |
2048 | ||
cb7b593c SH |
2049 | pr_debug("get_next iter={node=%p index=%d depth=%d}\n", |
2050 | iter->tnode, iter->index, iter->depth); | |
2051 | rescan: | |
2052 | while (cindex < (1<<tn->bits)) { | |
b59cfbf7 | 2053 | struct node *n = tnode_get_child_rcu(tn, cindex); |
19baf839 | 2054 | |
cb7b593c SH |
2055 | if (n) { |
2056 | if (IS_LEAF(n)) { | |
2057 | iter->tnode = tn; | |
2058 | iter->index = cindex + 1; | |
2059 | } else { | |
2060 | /* push down one level */ | |
2061 | iter->tnode = (struct tnode *) n; | |
2062 | iter->index = 0; | |
2063 | ++iter->depth; | |
2064 | } | |
2065 | return n; | |
2066 | } | |
19baf839 | 2067 | |
cb7b593c SH |
2068 | ++cindex; |
2069 | } | |
91b9a277 | 2070 | |
cb7b593c | 2071 | /* Current node exhausted, pop back up */ |
b59cfbf7 | 2072 | p = node_parent_rcu((struct node *)tn); |
cb7b593c SH |
2073 | if (p) { |
2074 | cindex = tkey_extract_bits(tn->key, p->pos, p->bits)+1; | |
2075 | tn = p; | |
2076 | --iter->depth; | |
2077 | goto rescan; | |
19baf839 | 2078 | } |
cb7b593c SH |
2079 | |
2080 | /* got root? */ | |
2081 | return NULL; | |
19baf839 RO |
2082 | } |
2083 | ||
cb7b593c SH |
2084 | static struct node *fib_trie_get_first(struct fib_trie_iter *iter, |
2085 | struct trie *t) | |
19baf839 | 2086 | { |
3d3b2d25 | 2087 | struct node *n; |
5ddf0eb2 | 2088 | |
132adf54 | 2089 | if (!t) |
5ddf0eb2 RO |
2090 | return NULL; |
2091 | ||
2092 | n = rcu_dereference(t->trie); | |
3d3b2d25 | 2093 | if (!n) |
5ddf0eb2 | 2094 | return NULL; |
19baf839 | 2095 | |
3d3b2d25 SH |
2096 | if (IS_TNODE(n)) { |
2097 | iter->tnode = (struct tnode *) n; | |
2098 | iter->index = 0; | |
2099 | iter->depth = 1; | |
2100 | } else { | |
2101 | iter->tnode = NULL; | |
2102 | iter->index = 0; | |
2103 | iter->depth = 0; | |
91b9a277 | 2104 | } |
3d3b2d25 SH |
2105 | |
2106 | return n; | |
cb7b593c | 2107 | } |
91b9a277 | 2108 | |
cb7b593c SH |
2109 | static void trie_collect_stats(struct trie *t, struct trie_stat *s) |
2110 | { | |
2111 | struct node *n; | |
2112 | struct fib_trie_iter iter; | |
91b9a277 | 2113 | |
cb7b593c | 2114 | memset(s, 0, sizeof(*s)); |
91b9a277 | 2115 | |
cb7b593c | 2116 | rcu_read_lock(); |
3d3b2d25 | 2117 | for (n = fib_trie_get_first(&iter, t); n; n = fib_trie_get_next(&iter)) { |
cb7b593c | 2118 | if (IS_LEAF(n)) { |
93672292 SH |
2119 | struct leaf *l = (struct leaf *)n; |
2120 | struct leaf_info *li; | |
2121 | struct hlist_node *tmp; | |
2122 | ||
cb7b593c SH |
2123 | s->leaves++; |
2124 | s->totdepth += iter.depth; | |
2125 | if (iter.depth > s->maxdepth) | |
2126 | s->maxdepth = iter.depth; | |
93672292 SH |
2127 | |
2128 | hlist_for_each_entry_rcu(li, tmp, &l->list, hlist) | |
2129 | ++s->prefixes; | |
cb7b593c SH |
2130 | } else { |
2131 | const struct tnode *tn = (const struct tnode *) n; | |
2132 | int i; | |
2133 | ||
2134 | s->tnodes++; | |
132adf54 | 2135 | if (tn->bits < MAX_STAT_DEPTH) |
06ef921d RO |
2136 | s->nodesizes[tn->bits]++; |
2137 | ||
cb7b593c SH |
2138 | for (i = 0; i < (1<<tn->bits); i++) |
2139 | if (!tn->child[i]) | |
2140 | s->nullpointers++; | |
19baf839 | 2141 | } |
19baf839 | 2142 | } |
2373ce1c | 2143 | rcu_read_unlock(); |
19baf839 RO |
2144 | } |
2145 | ||
cb7b593c SH |
2146 | /* |
2147 | * This outputs /proc/net/fib_triestats | |
2148 | */ | |
2149 | static void trie_show_stats(struct seq_file *seq, struct trie_stat *stat) | |
19baf839 | 2150 | { |
a034ee3c | 2151 | unsigned int i, max, pointers, bytes, avdepth; |
c877efb2 | 2152 | |
cb7b593c SH |
2153 | if (stat->leaves) |
2154 | avdepth = stat->totdepth*100 / stat->leaves; | |
2155 | else | |
2156 | avdepth = 0; | |
91b9a277 | 2157 | |
a07f5f50 SH |
2158 | seq_printf(seq, "\tAver depth: %u.%02d\n", |
2159 | avdepth / 100, avdepth % 100); | |
cb7b593c | 2160 | seq_printf(seq, "\tMax depth: %u\n", stat->maxdepth); |
91b9a277 | 2161 | |
cb7b593c | 2162 | seq_printf(seq, "\tLeaves: %u\n", stat->leaves); |
cb7b593c | 2163 | bytes = sizeof(struct leaf) * stat->leaves; |
93672292 SH |
2164 | |
2165 | seq_printf(seq, "\tPrefixes: %u\n", stat->prefixes); | |
2166 | bytes += sizeof(struct leaf_info) * stat->prefixes; | |
2167 | ||
187b5188 | 2168 | seq_printf(seq, "\tInternal nodes: %u\n\t", stat->tnodes); |
cb7b593c | 2169 | bytes += sizeof(struct tnode) * stat->tnodes; |
19baf839 | 2170 | |
06ef921d RO |
2171 | max = MAX_STAT_DEPTH; |
2172 | while (max > 0 && stat->nodesizes[max-1] == 0) | |
cb7b593c | 2173 | max--; |
19baf839 | 2174 | |
cb7b593c SH |
2175 | pointers = 0; |
2176 | for (i = 1; i <= max; i++) | |
2177 | if (stat->nodesizes[i] != 0) { | |
187b5188 | 2178 | seq_printf(seq, " %u: %u", i, stat->nodesizes[i]); |
cb7b593c SH |
2179 | pointers += (1<<i) * stat->nodesizes[i]; |
2180 | } | |
2181 | seq_putc(seq, '\n'); | |
187b5188 | 2182 | seq_printf(seq, "\tPointers: %u\n", pointers); |
2373ce1c | 2183 | |
cb7b593c | 2184 | bytes += sizeof(struct node *) * pointers; |
187b5188 SH |
2185 | seq_printf(seq, "Null ptrs: %u\n", stat->nullpointers); |
2186 | seq_printf(seq, "Total size: %u kB\n", (bytes + 1023) / 1024); | |
66a2f7fd | 2187 | } |
2373ce1c | 2188 | |
cb7b593c | 2189 | #ifdef CONFIG_IP_FIB_TRIE_STATS |
66a2f7fd SH |
2190 | static void trie_show_usage(struct seq_file *seq, |
2191 | const struct trie_use_stats *stats) | |
2192 | { | |
2193 | seq_printf(seq, "\nCounters:\n---------\n"); | |
a07f5f50 SH |
2194 | seq_printf(seq, "gets = %u\n", stats->gets); |
2195 | seq_printf(seq, "backtracks = %u\n", stats->backtrack); | |
2196 | seq_printf(seq, "semantic match passed = %u\n", | |
2197 | stats->semantic_match_passed); | |
2198 | seq_printf(seq, "semantic match miss = %u\n", | |
2199 | stats->semantic_match_miss); | |
2200 | seq_printf(seq, "null node hit= %u\n", stats->null_node_hit); | |
2201 | seq_printf(seq, "skipped node resize = %u\n\n", | |
2202 | stats->resize_node_skipped); | |
cb7b593c | 2203 | } |
66a2f7fd SH |
2204 | #endif /* CONFIG_IP_FIB_TRIE_STATS */ |
2205 | ||
3d3b2d25 | 2206 | static void fib_table_print(struct seq_file *seq, struct fib_table *tb) |
d717a9a6 | 2207 | { |
3d3b2d25 SH |
2208 | if (tb->tb_id == RT_TABLE_LOCAL) |
2209 | seq_puts(seq, "Local:\n"); | |
2210 | else if (tb->tb_id == RT_TABLE_MAIN) | |
2211 | seq_puts(seq, "Main:\n"); | |
2212 | else | |
2213 | seq_printf(seq, "Id %d:\n", tb->tb_id); | |
d717a9a6 | 2214 | } |
19baf839 | 2215 | |
3d3b2d25 | 2216 | |
cb7b593c SH |
2217 | static int fib_triestat_seq_show(struct seq_file *seq, void *v) |
2218 | { | |
1c340b2f | 2219 | struct net *net = (struct net *)seq->private; |
3d3b2d25 | 2220 | unsigned int h; |
877a9bff | 2221 | |
d717a9a6 | 2222 | seq_printf(seq, |
a07f5f50 SH |
2223 | "Basic info: size of leaf:" |
2224 | " %Zd bytes, size of tnode: %Zd bytes.\n", | |
d717a9a6 SH |
2225 | sizeof(struct leaf), sizeof(struct tnode)); |
2226 | ||
3d3b2d25 SH |
2227 | for (h = 0; h < FIB_TABLE_HASHSZ; h++) { |
2228 | struct hlist_head *head = &net->ipv4.fib_table_hash[h]; | |
2229 | struct hlist_node *node; | |
2230 | struct fib_table *tb; | |
2231 | ||
2232 | hlist_for_each_entry_rcu(tb, node, head, tb_hlist) { | |
2233 | struct trie *t = (struct trie *) tb->tb_data; | |
2234 | struct trie_stat stat; | |
877a9bff | 2235 | |
3d3b2d25 SH |
2236 | if (!t) |
2237 | continue; | |
2238 | ||
2239 | fib_table_print(seq, tb); | |
2240 | ||
2241 | trie_collect_stats(t, &stat); | |
2242 | trie_show_stats(seq, &stat); | |
2243 | #ifdef CONFIG_IP_FIB_TRIE_STATS | |
2244 | trie_show_usage(seq, &t->stats); | |
2245 | #endif | |
2246 | } | |
2247 | } | |
19baf839 | 2248 | |
cb7b593c | 2249 | return 0; |
19baf839 RO |
2250 | } |
2251 | ||
cb7b593c | 2252 | static int fib_triestat_seq_open(struct inode *inode, struct file *file) |
19baf839 | 2253 | { |
de05c557 | 2254 | return single_open_net(inode, file, fib_triestat_seq_show); |
1c340b2f DL |
2255 | } |
2256 | ||
9a32144e | 2257 | static const struct file_operations fib_triestat_fops = { |
cb7b593c SH |
2258 | .owner = THIS_MODULE, |
2259 | .open = fib_triestat_seq_open, | |
2260 | .read = seq_read, | |
2261 | .llseek = seq_lseek, | |
b6fcbdb4 | 2262 | .release = single_release_net, |
cb7b593c SH |
2263 | }; |
2264 | ||
1218854a | 2265 | static struct node *fib_trie_get_idx(struct seq_file *seq, loff_t pos) |
19baf839 | 2266 | { |
1218854a YH |
2267 | struct fib_trie_iter *iter = seq->private; |
2268 | struct net *net = seq_file_net(seq); | |
cb7b593c | 2269 | loff_t idx = 0; |
3d3b2d25 | 2270 | unsigned int h; |
cb7b593c | 2271 | |
3d3b2d25 SH |
2272 | for (h = 0; h < FIB_TABLE_HASHSZ; h++) { |
2273 | struct hlist_head *head = &net->ipv4.fib_table_hash[h]; | |
2274 | struct hlist_node *node; | |
2275 | struct fib_table *tb; | |
cb7b593c | 2276 | |
3d3b2d25 SH |
2277 | hlist_for_each_entry_rcu(tb, node, head, tb_hlist) { |
2278 | struct node *n; | |
2279 | ||
2280 | for (n = fib_trie_get_first(iter, | |
2281 | (struct trie *) tb->tb_data); | |
2282 | n; n = fib_trie_get_next(iter)) | |
2283 | if (pos == idx++) { | |
2284 | iter->tb = tb; | |
2285 | return n; | |
2286 | } | |
2287 | } | |
cb7b593c | 2288 | } |
3d3b2d25 | 2289 | |
19baf839 RO |
2290 | return NULL; |
2291 | } | |
2292 | ||
cb7b593c | 2293 | static void *fib_trie_seq_start(struct seq_file *seq, loff_t *pos) |
c95aaf9a | 2294 | __acquires(RCU) |
19baf839 | 2295 | { |
cb7b593c | 2296 | rcu_read_lock(); |
1218854a | 2297 | return fib_trie_get_idx(seq, *pos); |
19baf839 RO |
2298 | } |
2299 | ||
cb7b593c | 2300 | static void *fib_trie_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
19baf839 | 2301 | { |
cb7b593c | 2302 | struct fib_trie_iter *iter = seq->private; |
1218854a | 2303 | struct net *net = seq_file_net(seq); |
3d3b2d25 SH |
2304 | struct fib_table *tb = iter->tb; |
2305 | struct hlist_node *tb_node; | |
2306 | unsigned int h; | |
2307 | struct node *n; | |
cb7b593c | 2308 | |
19baf839 | 2309 | ++*pos; |
3d3b2d25 SH |
2310 | /* next node in same table */ |
2311 | n = fib_trie_get_next(iter); | |
2312 | if (n) | |
2313 | return n; | |
19baf839 | 2314 | |
3d3b2d25 SH |
2315 | /* walk rest of this hash chain */ |
2316 | h = tb->tb_id & (FIB_TABLE_HASHSZ - 1); | |
2317 | while ( (tb_node = rcu_dereference(tb->tb_hlist.next)) ) { | |
2318 | tb = hlist_entry(tb_node, struct fib_table, tb_hlist); | |
2319 | n = fib_trie_get_first(iter, (struct trie *) tb->tb_data); | |
2320 | if (n) | |
2321 | goto found; | |
2322 | } | |
19baf839 | 2323 | |
3d3b2d25 SH |
2324 | /* new hash chain */ |
2325 | while (++h < FIB_TABLE_HASHSZ) { | |
2326 | struct hlist_head *head = &net->ipv4.fib_table_hash[h]; | |
2327 | hlist_for_each_entry_rcu(tb, tb_node, head, tb_hlist) { | |
2328 | n = fib_trie_get_first(iter, (struct trie *) tb->tb_data); | |
2329 | if (n) | |
2330 | goto found; | |
2331 | } | |
2332 | } | |
cb7b593c | 2333 | return NULL; |
3d3b2d25 SH |
2334 | |
2335 | found: | |
2336 | iter->tb = tb; | |
2337 | return n; | |
cb7b593c | 2338 | } |
19baf839 | 2339 | |
cb7b593c | 2340 | static void fib_trie_seq_stop(struct seq_file *seq, void *v) |
c95aaf9a | 2341 | __releases(RCU) |
19baf839 | 2342 | { |
cb7b593c SH |
2343 | rcu_read_unlock(); |
2344 | } | |
91b9a277 | 2345 | |
cb7b593c SH |
2346 | static void seq_indent(struct seq_file *seq, int n) |
2347 | { | |
a034ee3c ED |
2348 | while (n-- > 0) |
2349 | seq_puts(seq, " "); | |
cb7b593c | 2350 | } |
19baf839 | 2351 | |
28d36e37 | 2352 | static inline const char *rtn_scope(char *buf, size_t len, enum rt_scope_t s) |
cb7b593c | 2353 | { |
132adf54 | 2354 | switch (s) { |
cb7b593c SH |
2355 | case RT_SCOPE_UNIVERSE: return "universe"; |
2356 | case RT_SCOPE_SITE: return "site"; | |
2357 | case RT_SCOPE_LINK: return "link"; | |
2358 | case RT_SCOPE_HOST: return "host"; | |
2359 | case RT_SCOPE_NOWHERE: return "nowhere"; | |
2360 | default: | |
28d36e37 | 2361 | snprintf(buf, len, "scope=%d", s); |
cb7b593c SH |
2362 | return buf; |
2363 | } | |
2364 | } | |
19baf839 | 2365 | |
36cbd3dc | 2366 | static const char *const rtn_type_names[__RTN_MAX] = { |
cb7b593c SH |
2367 | [RTN_UNSPEC] = "UNSPEC", |
2368 | [RTN_UNICAST] = "UNICAST", | |
2369 | [RTN_LOCAL] = "LOCAL", | |
2370 | [RTN_BROADCAST] = "BROADCAST", | |
2371 | [RTN_ANYCAST] = "ANYCAST", | |
2372 | [RTN_MULTICAST] = "MULTICAST", | |
2373 | [RTN_BLACKHOLE] = "BLACKHOLE", | |
2374 | [RTN_UNREACHABLE] = "UNREACHABLE", | |
2375 | [RTN_PROHIBIT] = "PROHIBIT", | |
2376 | [RTN_THROW] = "THROW", | |
2377 | [RTN_NAT] = "NAT", | |
2378 | [RTN_XRESOLVE] = "XRESOLVE", | |
2379 | }; | |
19baf839 | 2380 | |
a034ee3c | 2381 | static inline const char *rtn_type(char *buf, size_t len, unsigned int t) |
cb7b593c | 2382 | { |
cb7b593c SH |
2383 | if (t < __RTN_MAX && rtn_type_names[t]) |
2384 | return rtn_type_names[t]; | |
28d36e37 | 2385 | snprintf(buf, len, "type %u", t); |
cb7b593c | 2386 | return buf; |
19baf839 RO |
2387 | } |
2388 | ||
cb7b593c SH |
2389 | /* Pretty print the trie */ |
2390 | static int fib_trie_seq_show(struct seq_file *seq, void *v) | |
19baf839 | 2391 | { |
cb7b593c SH |
2392 | const struct fib_trie_iter *iter = seq->private; |
2393 | struct node *n = v; | |
c877efb2 | 2394 | |
3d3b2d25 SH |
2395 | if (!node_parent_rcu(n)) |
2396 | fib_table_print(seq, iter->tb); | |
095b8501 | 2397 | |
cb7b593c SH |
2398 | if (IS_TNODE(n)) { |
2399 | struct tnode *tn = (struct tnode *) n; | |
ab66b4a7 | 2400 | __be32 prf = htonl(mask_pfx(tn->key, tn->pos)); |
91b9a277 | 2401 | |
1d25cd6c | 2402 | seq_indent(seq, iter->depth-1); |
673d57e7 HH |
2403 | seq_printf(seq, " +-- %pI4/%d %d %d %d\n", |
2404 | &prf, tn->pos, tn->bits, tn->full_children, | |
1d25cd6c | 2405 | tn->empty_children); |
e905a9ed | 2406 | |
cb7b593c SH |
2407 | } else { |
2408 | struct leaf *l = (struct leaf *) n; | |
1328042e SH |
2409 | struct leaf_info *li; |
2410 | struct hlist_node *node; | |
32ab5f80 | 2411 | __be32 val = htonl(l->key); |
cb7b593c SH |
2412 | |
2413 | seq_indent(seq, iter->depth); | |
673d57e7 | 2414 | seq_printf(seq, " |-- %pI4\n", &val); |
1328042e SH |
2415 | |
2416 | hlist_for_each_entry_rcu(li, node, &l->list, hlist) { | |
2417 | struct fib_alias *fa; | |
2418 | ||
2419 | list_for_each_entry_rcu(fa, &li->falh, fa_list) { | |
2420 | char buf1[32], buf2[32]; | |
2421 | ||
2422 | seq_indent(seq, iter->depth+1); | |
2423 | seq_printf(seq, " /%d %s %s", li->plen, | |
2424 | rtn_scope(buf1, sizeof(buf1), | |
2425 | fa->fa_scope), | |
2426 | rtn_type(buf2, sizeof(buf2), | |
2427 | fa->fa_type)); | |
2428 | if (fa->fa_tos) | |
b9c4d82a | 2429 | seq_printf(seq, " tos=%d", fa->fa_tos); |
1328042e | 2430 | seq_putc(seq, '\n'); |
cb7b593c SH |
2431 | } |
2432 | } | |
19baf839 | 2433 | } |
cb7b593c | 2434 | |
19baf839 RO |
2435 | return 0; |
2436 | } | |
2437 | ||
f690808e | 2438 | static const struct seq_operations fib_trie_seq_ops = { |
cb7b593c SH |
2439 | .start = fib_trie_seq_start, |
2440 | .next = fib_trie_seq_next, | |
2441 | .stop = fib_trie_seq_stop, | |
2442 | .show = fib_trie_seq_show, | |
19baf839 RO |
2443 | }; |
2444 | ||
cb7b593c | 2445 | static int fib_trie_seq_open(struct inode *inode, struct file *file) |
19baf839 | 2446 | { |
1c340b2f DL |
2447 | return seq_open_net(inode, file, &fib_trie_seq_ops, |
2448 | sizeof(struct fib_trie_iter)); | |
19baf839 RO |
2449 | } |
2450 | ||
9a32144e | 2451 | static const struct file_operations fib_trie_fops = { |
cb7b593c SH |
2452 | .owner = THIS_MODULE, |
2453 | .open = fib_trie_seq_open, | |
2454 | .read = seq_read, | |
2455 | .llseek = seq_lseek, | |
1c340b2f | 2456 | .release = seq_release_net, |
19baf839 RO |
2457 | }; |
2458 | ||
8315f5d8 SH |
2459 | struct fib_route_iter { |
2460 | struct seq_net_private p; | |
2461 | struct trie *main_trie; | |
2462 | loff_t pos; | |
2463 | t_key key; | |
2464 | }; | |
2465 | ||
2466 | static struct leaf *fib_route_get_idx(struct fib_route_iter *iter, loff_t pos) | |
2467 | { | |
2468 | struct leaf *l = NULL; | |
2469 | struct trie *t = iter->main_trie; | |
2470 | ||
2471 | /* use cache location of last found key */ | |
2472 | if (iter->pos > 0 && pos >= iter->pos && (l = fib_find_node(t, iter->key))) | |
2473 | pos -= iter->pos; | |
2474 | else { | |
2475 | iter->pos = 0; | |
2476 | l = trie_firstleaf(t); | |
2477 | } | |
2478 | ||
2479 | while (l && pos-- > 0) { | |
2480 | iter->pos++; | |
2481 | l = trie_nextleaf(l); | |
2482 | } | |
2483 | ||
2484 | if (l) | |
2485 | iter->key = pos; /* remember it */ | |
2486 | else | |
2487 | iter->pos = 0; /* forget it */ | |
2488 | ||
2489 | return l; | |
2490 | } | |
2491 | ||
2492 | static void *fib_route_seq_start(struct seq_file *seq, loff_t *pos) | |
2493 | __acquires(RCU) | |
2494 | { | |
2495 | struct fib_route_iter *iter = seq->private; | |
2496 | struct fib_table *tb; | |
2497 | ||
2498 | rcu_read_lock(); | |
1218854a | 2499 | tb = fib_get_table(seq_file_net(seq), RT_TABLE_MAIN); |
8315f5d8 SH |
2500 | if (!tb) |
2501 | return NULL; | |
2502 | ||
2503 | iter->main_trie = (struct trie *) tb->tb_data; | |
2504 | if (*pos == 0) | |
2505 | return SEQ_START_TOKEN; | |
2506 | else | |
2507 | return fib_route_get_idx(iter, *pos - 1); | |
2508 | } | |
2509 | ||
2510 | static void *fib_route_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2511 | { | |
2512 | struct fib_route_iter *iter = seq->private; | |
2513 | struct leaf *l = v; | |
2514 | ||
2515 | ++*pos; | |
2516 | if (v == SEQ_START_TOKEN) { | |
2517 | iter->pos = 0; | |
2518 | l = trie_firstleaf(iter->main_trie); | |
2519 | } else { | |
2520 | iter->pos++; | |
2521 | l = trie_nextleaf(l); | |
2522 | } | |
2523 | ||
2524 | if (l) | |
2525 | iter->key = l->key; | |
2526 | else | |
2527 | iter->pos = 0; | |
2528 | return l; | |
2529 | } | |
2530 | ||
2531 | static void fib_route_seq_stop(struct seq_file *seq, void *v) | |
2532 | __releases(RCU) | |
2533 | { | |
2534 | rcu_read_unlock(); | |
2535 | } | |
2536 | ||
a034ee3c | 2537 | static unsigned int fib_flag_trans(int type, __be32 mask, const struct fib_info *fi) |
19baf839 | 2538 | { |
a034ee3c | 2539 | unsigned int flags = 0; |
19baf839 | 2540 | |
a034ee3c ED |
2541 | if (type == RTN_UNREACHABLE || type == RTN_PROHIBIT) |
2542 | flags = RTF_REJECT; | |
cb7b593c SH |
2543 | if (fi && fi->fib_nh->nh_gw) |
2544 | flags |= RTF_GATEWAY; | |
32ab5f80 | 2545 | if (mask == htonl(0xFFFFFFFF)) |
cb7b593c SH |
2546 | flags |= RTF_HOST; |
2547 | flags |= RTF_UP; | |
2548 | return flags; | |
19baf839 RO |
2549 | } |
2550 | ||
cb7b593c SH |
2551 | /* |
2552 | * This outputs /proc/net/route. | |
2553 | * The format of the file is not supposed to be changed | |
a034ee3c | 2554 | * and needs to be same as fib_hash output to avoid breaking |
cb7b593c SH |
2555 | * legacy utilities |
2556 | */ | |
2557 | static int fib_route_seq_show(struct seq_file *seq, void *v) | |
19baf839 | 2558 | { |
cb7b593c | 2559 | struct leaf *l = v; |
1328042e SH |
2560 | struct leaf_info *li; |
2561 | struct hlist_node *node; | |
19baf839 | 2562 | |
cb7b593c SH |
2563 | if (v == SEQ_START_TOKEN) { |
2564 | seq_printf(seq, "%-127s\n", "Iface\tDestination\tGateway " | |
2565 | "\tFlags\tRefCnt\tUse\tMetric\tMask\t\tMTU" | |
2566 | "\tWindow\tIRTT"); | |
2567 | return 0; | |
2568 | } | |
19baf839 | 2569 | |
1328042e | 2570 | hlist_for_each_entry_rcu(li, node, &l->list, hlist) { |
cb7b593c | 2571 | struct fib_alias *fa; |
32ab5f80 | 2572 | __be32 mask, prefix; |
91b9a277 | 2573 | |
cb7b593c SH |
2574 | mask = inet_make_mask(li->plen); |
2575 | prefix = htonl(l->key); | |
19baf839 | 2576 | |
cb7b593c | 2577 | list_for_each_entry_rcu(fa, &li->falh, fa_list) { |
1371e37d | 2578 | const struct fib_info *fi = fa->fa_info; |
a034ee3c | 2579 | unsigned int flags = fib_flag_trans(fa->fa_type, mask, fi); |
5e659e4c | 2580 | int len; |
19baf839 | 2581 | |
cb7b593c SH |
2582 | if (fa->fa_type == RTN_BROADCAST |
2583 | || fa->fa_type == RTN_MULTICAST) | |
2584 | continue; | |
19baf839 | 2585 | |
cb7b593c | 2586 | if (fi) |
5e659e4c PE |
2587 | seq_printf(seq, |
2588 | "%s\t%08X\t%08X\t%04X\t%d\t%u\t" | |
2589 | "%d\t%08X\t%d\t%u\t%u%n", | |
cb7b593c SH |
2590 | fi->fib_dev ? fi->fib_dev->name : "*", |
2591 | prefix, | |
2592 | fi->fib_nh->nh_gw, flags, 0, 0, | |
2593 | fi->fib_priority, | |
2594 | mask, | |
a07f5f50 SH |
2595 | (fi->fib_advmss ? |
2596 | fi->fib_advmss + 40 : 0), | |
cb7b593c | 2597 | fi->fib_window, |
5e659e4c | 2598 | fi->fib_rtt >> 3, &len); |
cb7b593c | 2599 | else |
5e659e4c PE |
2600 | seq_printf(seq, |
2601 | "*\t%08X\t%08X\t%04X\t%d\t%u\t" | |
2602 | "%d\t%08X\t%d\t%u\t%u%n", | |
cb7b593c | 2603 | prefix, 0, flags, 0, 0, 0, |
5e659e4c | 2604 | mask, 0, 0, 0, &len); |
19baf839 | 2605 | |
5e659e4c | 2606 | seq_printf(seq, "%*s\n", 127 - len, ""); |
cb7b593c | 2607 | } |
19baf839 RO |
2608 | } |
2609 | ||
2610 | return 0; | |
2611 | } | |
2612 | ||
f690808e | 2613 | static const struct seq_operations fib_route_seq_ops = { |
8315f5d8 SH |
2614 | .start = fib_route_seq_start, |
2615 | .next = fib_route_seq_next, | |
2616 | .stop = fib_route_seq_stop, | |
cb7b593c | 2617 | .show = fib_route_seq_show, |
19baf839 RO |
2618 | }; |
2619 | ||
cb7b593c | 2620 | static int fib_route_seq_open(struct inode *inode, struct file *file) |
19baf839 | 2621 | { |
1c340b2f | 2622 | return seq_open_net(inode, file, &fib_route_seq_ops, |
8315f5d8 | 2623 | sizeof(struct fib_route_iter)); |
19baf839 RO |
2624 | } |
2625 | ||
9a32144e | 2626 | static const struct file_operations fib_route_fops = { |
cb7b593c SH |
2627 | .owner = THIS_MODULE, |
2628 | .open = fib_route_seq_open, | |
2629 | .read = seq_read, | |
2630 | .llseek = seq_lseek, | |
1c340b2f | 2631 | .release = seq_release_net, |
19baf839 RO |
2632 | }; |
2633 | ||
61a02653 | 2634 | int __net_init fib_proc_init(struct net *net) |
19baf839 | 2635 | { |
61a02653 | 2636 | if (!proc_net_fops_create(net, "fib_trie", S_IRUGO, &fib_trie_fops)) |
cb7b593c SH |
2637 | goto out1; |
2638 | ||
61a02653 DL |
2639 | if (!proc_net_fops_create(net, "fib_triestat", S_IRUGO, |
2640 | &fib_triestat_fops)) | |
cb7b593c SH |
2641 | goto out2; |
2642 | ||
61a02653 | 2643 | if (!proc_net_fops_create(net, "route", S_IRUGO, &fib_route_fops)) |
cb7b593c SH |
2644 | goto out3; |
2645 | ||
19baf839 | 2646 | return 0; |
cb7b593c SH |
2647 | |
2648 | out3: | |
61a02653 | 2649 | proc_net_remove(net, "fib_triestat"); |
cb7b593c | 2650 | out2: |
61a02653 | 2651 | proc_net_remove(net, "fib_trie"); |
cb7b593c SH |
2652 | out1: |
2653 | return -ENOMEM; | |
19baf839 RO |
2654 | } |
2655 | ||
61a02653 | 2656 | void __net_exit fib_proc_exit(struct net *net) |
19baf839 | 2657 | { |
61a02653 DL |
2658 | proc_net_remove(net, "fib_trie"); |
2659 | proc_net_remove(net, "fib_triestat"); | |
2660 | proc_net_remove(net, "route"); | |
19baf839 RO |
2661 | } |
2662 | ||
2663 | #endif /* CONFIG_PROC_FS */ |