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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 | * | |
25985edc | 15 | * This work is based on the LPC-trie which is originally described 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 | 53 | #include <asm/uaccess.h> |
1977f032 | 54 | #include <linux/bitops.h> |
19baf839 RO |
55 | #include <linux/types.h> |
56 | #include <linux/kernel.h> | |
19baf839 RO |
57 | #include <linux/mm.h> |
58 | #include <linux/string.h> | |
59 | #include <linux/socket.h> | |
60 | #include <linux/sockios.h> | |
61 | #include <linux/errno.h> | |
62 | #include <linux/in.h> | |
63 | #include <linux/inet.h> | |
cd8787ab | 64 | #include <linux/inetdevice.h> |
19baf839 RO |
65 | #include <linux/netdevice.h> |
66 | #include <linux/if_arp.h> | |
67 | #include <linux/proc_fs.h> | |
2373ce1c | 68 | #include <linux/rcupdate.h> |
19baf839 RO |
69 | #include <linux/skbuff.h> |
70 | #include <linux/netlink.h> | |
71 | #include <linux/init.h> | |
72 | #include <linux/list.h> | |
5a0e3ad6 | 73 | #include <linux/slab.h> |
bc3b2d7f | 74 | #include <linux/export.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 | ||
64c9b6fb AD |
90 | #define IS_TNODE(n) ((n)->bits) |
91 | #define IS_LEAF(n) (!(n)->bits) | |
2373ce1c | 92 | |
9f9e636d AD |
93 | #define get_shift(_kv) (KEYLENGTH - (_kv)->pos - (_kv)->bits) |
94 | #define get_index(_key, _kv) (((_key) ^ (_kv)->key) >> get_shift(_kv)) | |
95 | ||
64c9b6fb AD |
96 | struct tnode { |
97 | t_key key; | |
98 | unsigned char bits; /* 2log(KEYLENGTH) bits needed */ | |
99 | unsigned char pos; /* 2log(KEYLENGTH) bits needed */ | |
100 | struct tnode __rcu *parent; | |
37fd30f2 | 101 | struct rcu_head rcu; |
adaf9816 AD |
102 | union { |
103 | /* The fields in this struct are valid if bits > 0 (TNODE) */ | |
104 | struct { | |
105 | unsigned int full_children; /* KEYLENGTH bits needed */ | |
106 | unsigned int empty_children; /* KEYLENGTH bits needed */ | |
107 | struct tnode __rcu *child[0]; | |
108 | }; | |
109 | /* This list pointer if valid if bits == 0 (LEAF) */ | |
110 | struct hlist_head list; | |
111 | }; | |
19baf839 RO |
112 | }; |
113 | ||
114 | struct leaf_info { | |
115 | struct hlist_node hlist; | |
116 | int plen; | |
5c74501f | 117 | u32 mask_plen; /* ntohl(inet_make_mask(plen)) */ |
19baf839 | 118 | struct list_head falh; |
5c74501f | 119 | struct rcu_head rcu; |
19baf839 RO |
120 | }; |
121 | ||
19baf839 RO |
122 | #ifdef CONFIG_IP_FIB_TRIE_STATS |
123 | struct trie_use_stats { | |
124 | unsigned int gets; | |
125 | unsigned int backtrack; | |
126 | unsigned int semantic_match_passed; | |
127 | unsigned int semantic_match_miss; | |
128 | unsigned int null_node_hit; | |
2f36895a | 129 | unsigned int resize_node_skipped; |
19baf839 RO |
130 | }; |
131 | #endif | |
132 | ||
133 | struct trie_stat { | |
134 | unsigned int totdepth; | |
135 | unsigned int maxdepth; | |
136 | unsigned int tnodes; | |
137 | unsigned int leaves; | |
138 | unsigned int nullpointers; | |
93672292 | 139 | unsigned int prefixes; |
06ef921d | 140 | unsigned int nodesizes[MAX_STAT_DEPTH]; |
c877efb2 | 141 | }; |
19baf839 RO |
142 | |
143 | struct trie { | |
adaf9816 | 144 | struct tnode __rcu *trie; |
19baf839 | 145 | #ifdef CONFIG_IP_FIB_TRIE_STATS |
8274a97a | 146 | struct trie_use_stats __percpu *stats; |
19baf839 | 147 | #endif |
19baf839 RO |
148 | }; |
149 | ||
adaf9816 | 150 | static void tnode_put_child_reorg(struct tnode *tn, int i, struct tnode *n, |
a07f5f50 | 151 | int wasfull); |
adaf9816 | 152 | static struct tnode *resize(struct trie *t, struct tnode *tn); |
2f80b3c8 RO |
153 | static struct tnode *inflate(struct trie *t, struct tnode *tn); |
154 | static struct tnode *halve(struct trie *t, struct tnode *tn); | |
e0f7cb8c | 155 | /* tnodes to free after resize(); protected by RTNL */ |
37fd30f2 | 156 | static struct callback_head *tnode_free_head; |
c3059477 JP |
157 | static size_t tnode_free_size; |
158 | ||
159 | /* | |
160 | * synchronize_rcu after call_rcu for that many pages; it should be especially | |
161 | * useful before resizing the root node with PREEMPT_NONE configs; the value was | |
162 | * obtained experimentally, aiming to avoid visible slowdown. | |
163 | */ | |
164 | static const int sync_pages = 128; | |
19baf839 | 165 | |
e18b890b | 166 | static struct kmem_cache *fn_alias_kmem __read_mostly; |
bc3c8c1e | 167 | static struct kmem_cache *trie_leaf_kmem __read_mostly; |
19baf839 | 168 | |
64c9b6fb AD |
169 | /* caller must hold RTNL */ |
170 | #define node_parent(n) rtnl_dereference((n)->parent) | |
0a5c0475 | 171 | |
64c9b6fb AD |
172 | /* caller must hold RCU read lock or RTNL */ |
173 | #define node_parent_rcu(n) rcu_dereference_rtnl((n)->parent) | |
0a5c0475 | 174 | |
64c9b6fb | 175 | /* wrapper for rcu_assign_pointer */ |
adaf9816 | 176 | static inline void node_set_parent(struct tnode *n, struct tnode *tp) |
b59cfbf7 | 177 | { |
adaf9816 AD |
178 | if (n) |
179 | rcu_assign_pointer(n->parent, tp); | |
06801916 SH |
180 | } |
181 | ||
64c9b6fb AD |
182 | #define NODE_INIT_PARENT(n, p) RCU_INIT_POINTER((n)->parent, p) |
183 | ||
184 | /* This provides us with the number of children in this node, in the case of a | |
185 | * leaf this will return 0 meaning none of the children are accessible. | |
6440cc9e | 186 | */ |
64c9b6fb | 187 | static inline int tnode_child_length(const struct tnode *tn) |
06801916 | 188 | { |
64c9b6fb | 189 | return (1ul << tn->bits) & ~(1ul); |
06801916 | 190 | } |
2373ce1c | 191 | |
0a5c0475 ED |
192 | /* |
193 | * caller must hold RTNL | |
194 | */ | |
adaf9816 | 195 | static inline struct tnode *tnode_get_child(const struct tnode *tn, unsigned int i) |
b59cfbf7 | 196 | { |
64c9b6fb | 197 | BUG_ON(i >= tnode_child_length(tn)); |
2373ce1c | 198 | |
0a5c0475 | 199 | return rtnl_dereference(tn->child[i]); |
b59cfbf7 ED |
200 | } |
201 | ||
0a5c0475 ED |
202 | /* |
203 | * caller must hold RCU read lock or RTNL | |
204 | */ | |
adaf9816 | 205 | static inline struct tnode *tnode_get_child_rcu(const struct tnode *tn, unsigned int i) |
19baf839 | 206 | { |
64c9b6fb | 207 | BUG_ON(i >= tnode_child_length(tn)); |
19baf839 | 208 | |
0a5c0475 | 209 | return rcu_dereference_rtnl(tn->child[i]); |
19baf839 RO |
210 | } |
211 | ||
3b004569 | 212 | static inline t_key mask_pfx(t_key k, unsigned int l) |
ab66b4a7 SH |
213 | { |
214 | return (l == 0) ? 0 : k >> (KEYLENGTH-l) << (KEYLENGTH-l); | |
215 | } | |
216 | ||
3b004569 | 217 | static inline t_key tkey_extract_bits(t_key a, unsigned int offset, unsigned int bits) |
19baf839 | 218 | { |
91b9a277 | 219 | if (offset < KEYLENGTH) |
19baf839 | 220 | return ((t_key)(a << offset)) >> (KEYLENGTH - bits); |
91b9a277 | 221 | else |
19baf839 RO |
222 | return 0; |
223 | } | |
224 | ||
225 | static inline int tkey_equals(t_key a, t_key b) | |
226 | { | |
c877efb2 | 227 | return a == b; |
19baf839 RO |
228 | } |
229 | ||
230 | static inline int tkey_sub_equals(t_key a, int offset, int bits, t_key b) | |
231 | { | |
c877efb2 SH |
232 | if (bits == 0 || offset >= KEYLENGTH) |
233 | return 1; | |
91b9a277 OJ |
234 | bits = bits > KEYLENGTH ? KEYLENGTH : bits; |
235 | return ((a ^ b) << offset) >> (KEYLENGTH - bits) == 0; | |
c877efb2 | 236 | } |
19baf839 RO |
237 | |
238 | static inline int tkey_mismatch(t_key a, int offset, t_key b) | |
239 | { | |
240 | t_key diff = a ^ b; | |
241 | int i = offset; | |
242 | ||
c877efb2 SH |
243 | if (!diff) |
244 | return 0; | |
245 | while ((diff << i) >> (KEYLENGTH-1) == 0) | |
19baf839 RO |
246 | i++; |
247 | return i; | |
248 | } | |
249 | ||
19baf839 | 250 | /* |
e905a9ed YH |
251 | To understand this stuff, an understanding of keys and all their bits is |
252 | necessary. Every node in the trie has a key associated with it, but not | |
19baf839 RO |
253 | all of the bits in that key are significant. |
254 | ||
255 | Consider a node 'n' and its parent 'tp'. | |
256 | ||
e905a9ed YH |
257 | If n is a leaf, every bit in its key is significant. Its presence is |
258 | necessitated by path compression, since during a tree traversal (when | |
259 | searching for a leaf - unless we are doing an insertion) we will completely | |
260 | ignore all skipped bits we encounter. Thus we need to verify, at the end of | |
261 | a potentially successful search, that we have indeed been walking the | |
19baf839 RO |
262 | correct key path. |
263 | ||
e905a9ed YH |
264 | Note that we can never "miss" the correct key in the tree if present by |
265 | following the wrong path. Path compression ensures that segments of the key | |
266 | that are the same for all keys with a given prefix are skipped, but the | |
267 | skipped part *is* identical for each node in the subtrie below the skipped | |
268 | bit! trie_insert() in this implementation takes care of that - note the | |
19baf839 RO |
269 | call to tkey_sub_equals() in trie_insert(). |
270 | ||
e905a9ed | 271 | if n is an internal node - a 'tnode' here, the various parts of its key |
19baf839 RO |
272 | have many different meanings. |
273 | ||
e905a9ed | 274 | Example: |
19baf839 RO |
275 | _________________________________________________________________ |
276 | | i | i | i | i | i | i | i | N | N | N | S | S | S | S | S | C | | |
277 | ----------------------------------------------------------------- | |
e905a9ed | 278 | 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 |
19baf839 RO |
279 | |
280 | _________________________________________________________________ | |
281 | | C | C | C | u | u | u | u | u | u | u | u | u | u | u | u | u | | |
282 | ----------------------------------------------------------------- | |
283 | 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 | |
284 | ||
285 | tp->pos = 7 | |
286 | tp->bits = 3 | |
287 | n->pos = 15 | |
91b9a277 | 288 | n->bits = 4 |
19baf839 | 289 | |
e905a9ed YH |
290 | First, let's just ignore the bits that come before the parent tp, that is |
291 | the bits from 0 to (tp->pos-1). They are *known* but at this point we do | |
19baf839 RO |
292 | not use them for anything. |
293 | ||
294 | The bits from (tp->pos) to (tp->pos + tp->bits - 1) - "N", above - are the | |
e905a9ed | 295 | index into the parent's child array. That is, they will be used to find |
19baf839 RO |
296 | 'n' among tp's children. |
297 | ||
298 | The bits from (tp->pos + tp->bits) to (n->pos - 1) - "S" - are skipped bits | |
299 | for the node n. | |
300 | ||
e905a9ed | 301 | All the bits we have seen so far are significant to the node n. The rest |
19baf839 RO |
302 | of the bits are really not needed or indeed known in n->key. |
303 | ||
e905a9ed | 304 | The bits from (n->pos) to (n->pos + n->bits - 1) - "C" - are the index into |
19baf839 | 305 | n's child array, and will of course be different for each child. |
e905a9ed | 306 | |
c877efb2 | 307 | |
19baf839 RO |
308 | The rest of the bits, from (n->pos + n->bits) onward, are completely unknown |
309 | at this point. | |
310 | ||
311 | */ | |
312 | ||
f5026fab DL |
313 | static const int halve_threshold = 25; |
314 | static const int inflate_threshold = 50; | |
345aa031 | 315 | static const int halve_threshold_root = 15; |
80b71b80 | 316 | static const int inflate_threshold_root = 30; |
2373ce1c RO |
317 | |
318 | static void __alias_free_mem(struct rcu_head *head) | |
19baf839 | 319 | { |
2373ce1c RO |
320 | struct fib_alias *fa = container_of(head, struct fib_alias, rcu); |
321 | kmem_cache_free(fn_alias_kmem, fa); | |
19baf839 RO |
322 | } |
323 | ||
2373ce1c | 324 | static inline void alias_free_mem_rcu(struct fib_alias *fa) |
19baf839 | 325 | { |
2373ce1c RO |
326 | call_rcu(&fa->rcu, __alias_free_mem); |
327 | } | |
91b9a277 | 328 | |
37fd30f2 | 329 | #define TNODE_KMALLOC_MAX \ |
adaf9816 | 330 | ilog2((PAGE_SIZE - sizeof(struct tnode)) / sizeof(struct tnode *)) |
91b9a277 | 331 | |
37fd30f2 | 332 | static void __node_free_rcu(struct rcu_head *head) |
387a5487 | 333 | { |
adaf9816 | 334 | struct tnode *n = container_of(head, struct tnode, rcu); |
37fd30f2 AD |
335 | |
336 | if (IS_LEAF(n)) | |
337 | kmem_cache_free(trie_leaf_kmem, n); | |
338 | else if (n->bits <= TNODE_KMALLOC_MAX) | |
339 | kfree(n); | |
340 | else | |
341 | vfree(n); | |
387a5487 SH |
342 | } |
343 | ||
37fd30f2 AD |
344 | #define node_free(n) call_rcu(&n->rcu, __node_free_rcu) |
345 | ||
2373ce1c | 346 | static inline void free_leaf_info(struct leaf_info *leaf) |
19baf839 | 347 | { |
bceb0f45 | 348 | kfree_rcu(leaf, rcu); |
19baf839 RO |
349 | } |
350 | ||
8d965444 | 351 | static struct tnode *tnode_alloc(size_t size) |
f0e36f8c | 352 | { |
2373ce1c | 353 | if (size <= PAGE_SIZE) |
8d965444 | 354 | return kzalloc(size, GFP_KERNEL); |
15be75cd | 355 | else |
7a1c8e5a | 356 | return vzalloc(size); |
15be75cd | 357 | } |
2373ce1c | 358 | |
e0f7cb8c JP |
359 | static void tnode_free_safe(struct tnode *tn) |
360 | { | |
361 | BUG_ON(IS_LEAF(tn)); | |
37fd30f2 AD |
362 | tn->rcu.next = tnode_free_head; |
363 | tnode_free_head = &tn->rcu; | |
e0f7cb8c JP |
364 | } |
365 | ||
366 | static void tnode_free_flush(void) | |
367 | { | |
37fd30f2 AD |
368 | struct callback_head *head; |
369 | ||
370 | while ((head = tnode_free_head)) { | |
371 | struct tnode *tn = container_of(head, struct tnode, rcu); | |
372 | ||
373 | tnode_free_head = head->next; | |
374 | tnode_free_size += offsetof(struct tnode, child[1 << tn->bits]); | |
e0f7cb8c | 375 | |
37fd30f2 | 376 | node_free(tn); |
e0f7cb8c | 377 | } |
c3059477 JP |
378 | |
379 | if (tnode_free_size >= PAGE_SIZE * sync_pages) { | |
380 | tnode_free_size = 0; | |
381 | synchronize_rcu(); | |
382 | } | |
e0f7cb8c JP |
383 | } |
384 | ||
adaf9816 | 385 | static struct tnode *leaf_new(t_key key) |
2373ce1c | 386 | { |
adaf9816 | 387 | struct tnode *l = kmem_cache_alloc(trie_leaf_kmem, GFP_KERNEL); |
2373ce1c | 388 | if (l) { |
64c9b6fb AD |
389 | l->parent = NULL; |
390 | /* set key and pos to reflect full key value | |
391 | * any trailing zeros in the key should be ignored | |
392 | * as the nodes are searched | |
393 | */ | |
394 | l->key = key; | |
395 | l->pos = KEYLENGTH; | |
396 | /* set bits to 0 indicating we are not a tnode */ | |
397 | l->bits = 0; | |
398 | ||
2373ce1c RO |
399 | INIT_HLIST_HEAD(&l->list); |
400 | } | |
401 | return l; | |
402 | } | |
403 | ||
404 | static struct leaf_info *leaf_info_new(int plen) | |
405 | { | |
406 | struct leaf_info *li = kmalloc(sizeof(struct leaf_info), GFP_KERNEL); | |
407 | if (li) { | |
408 | li->plen = plen; | |
5c74501f | 409 | li->mask_plen = ntohl(inet_make_mask(plen)); |
2373ce1c RO |
410 | INIT_LIST_HEAD(&li->falh); |
411 | } | |
412 | return li; | |
413 | } | |
414 | ||
a07f5f50 | 415 | static struct tnode *tnode_new(t_key key, int pos, int bits) |
19baf839 | 416 | { |
37fd30f2 | 417 | size_t sz = offsetof(struct tnode, child[1 << bits]); |
f0e36f8c | 418 | struct tnode *tn = tnode_alloc(sz); |
64c9b6fb AD |
419 | unsigned int shift = pos + bits; |
420 | ||
421 | /* verify bits and pos their msb bits clear and values are valid */ | |
422 | BUG_ON(!bits || (shift > KEYLENGTH)); | |
19baf839 | 423 | |
91b9a277 | 424 | if (tn) { |
64c9b6fb | 425 | tn->parent = NULL; |
19baf839 RO |
426 | tn->pos = pos; |
427 | tn->bits = bits; | |
64c9b6fb | 428 | tn->key = mask_pfx(key, pos); |
19baf839 RO |
429 | tn->full_children = 0; |
430 | tn->empty_children = 1<<bits; | |
431 | } | |
c877efb2 | 432 | |
a034ee3c | 433 | pr_debug("AT %p s=%zu %zu\n", tn, sizeof(struct tnode), |
adaf9816 | 434 | sizeof(struct tnode *) << bits); |
19baf839 RO |
435 | return tn; |
436 | } | |
437 | ||
19baf839 RO |
438 | /* |
439 | * Check whether a tnode 'n' is "full", i.e. it is an internal node | |
440 | * and no bits are skipped. See discussion in dyntree paper p. 6 | |
441 | */ | |
442 | ||
adaf9816 | 443 | static inline int tnode_full(const struct tnode *tn, const struct tnode *n) |
19baf839 | 444 | { |
64c9b6fb | 445 | return n && IS_TNODE(n) && (n->pos == (tn->pos + tn->bits)); |
19baf839 RO |
446 | } |
447 | ||
61648d91 | 448 | static inline void put_child(struct tnode *tn, int i, |
adaf9816 | 449 | struct tnode *n) |
19baf839 RO |
450 | { |
451 | tnode_put_child_reorg(tn, i, n, -1); | |
452 | } | |
453 | ||
c877efb2 | 454 | /* |
19baf839 RO |
455 | * Add a child at position i overwriting the old value. |
456 | * Update the value of full_children and empty_children. | |
457 | */ | |
458 | ||
adaf9816 | 459 | static void tnode_put_child_reorg(struct tnode *tn, int i, struct tnode *n, |
a07f5f50 | 460 | int wasfull) |
19baf839 | 461 | { |
adaf9816 | 462 | struct tnode *chi = rtnl_dereference(tn->child[i]); |
19baf839 RO |
463 | int isfull; |
464 | ||
0c7770c7 SH |
465 | BUG_ON(i >= 1<<tn->bits); |
466 | ||
19baf839 RO |
467 | /* update emptyChildren */ |
468 | if (n == NULL && chi != NULL) | |
469 | tn->empty_children++; | |
470 | else if (n != NULL && chi == NULL) | |
471 | tn->empty_children--; | |
c877efb2 | 472 | |
19baf839 | 473 | /* update fullChildren */ |
91b9a277 | 474 | if (wasfull == -1) |
19baf839 RO |
475 | wasfull = tnode_full(tn, chi); |
476 | ||
477 | isfull = tnode_full(tn, n); | |
c877efb2 | 478 | if (wasfull && !isfull) |
19baf839 | 479 | tn->full_children--; |
c877efb2 | 480 | else if (!wasfull && isfull) |
19baf839 | 481 | tn->full_children++; |
91b9a277 | 482 | |
64c9b6fb | 483 | node_set_parent(n, tn); |
19baf839 | 484 | |
cf778b00 | 485 | rcu_assign_pointer(tn->child[i], n); |
19baf839 RO |
486 | } |
487 | ||
80b71b80 | 488 | #define MAX_WORK 10 |
adaf9816 | 489 | static struct tnode *resize(struct trie *t, struct tnode *tn) |
19baf839 | 490 | { |
adaf9816 | 491 | struct tnode *old_tn, *n = NULL; |
e6308be8 RO |
492 | int inflate_threshold_use; |
493 | int halve_threshold_use; | |
80b71b80 | 494 | int max_work; |
19baf839 | 495 | |
e905a9ed | 496 | if (!tn) |
19baf839 RO |
497 | return NULL; |
498 | ||
0c7770c7 SH |
499 | pr_debug("In tnode_resize %p inflate_threshold=%d threshold=%d\n", |
500 | tn, inflate_threshold, halve_threshold); | |
19baf839 RO |
501 | |
502 | /* No children */ | |
64c9b6fb AD |
503 | if (tn->empty_children > (tnode_child_length(tn) - 1)) |
504 | goto no_children; | |
505 | ||
19baf839 | 506 | /* One child */ |
64c9b6fb | 507 | if (tn->empty_children == (tnode_child_length(tn) - 1)) |
80b71b80 | 508 | goto one_child; |
c877efb2 | 509 | /* |
19baf839 RO |
510 | * Double as long as the resulting node has a number of |
511 | * nonempty nodes that are above the threshold. | |
512 | */ | |
513 | ||
514 | /* | |
c877efb2 SH |
515 | * From "Implementing a dynamic compressed trie" by Stefan Nilsson of |
516 | * the Helsinki University of Technology and Matti Tikkanen of Nokia | |
19baf839 | 517 | * Telecommunications, page 6: |
c877efb2 | 518 | * "A node is doubled if the ratio of non-empty children to all |
19baf839 RO |
519 | * children in the *doubled* node is at least 'high'." |
520 | * | |
c877efb2 SH |
521 | * 'high' in this instance is the variable 'inflate_threshold'. It |
522 | * is expressed as a percentage, so we multiply it with | |
523 | * tnode_child_length() and instead of multiplying by 2 (since the | |
524 | * child array will be doubled by inflate()) and multiplying | |
525 | * the left-hand side by 100 (to handle the percentage thing) we | |
19baf839 | 526 | * multiply the left-hand side by 50. |
c877efb2 SH |
527 | * |
528 | * The left-hand side may look a bit weird: tnode_child_length(tn) | |
529 | * - tn->empty_children is of course the number of non-null children | |
530 | * in the current node. tn->full_children is the number of "full" | |
19baf839 | 531 | * children, that is non-null tnodes with a skip value of 0. |
c877efb2 | 532 | * All of those will be doubled in the resulting inflated tnode, so |
19baf839 | 533 | * we just count them one extra time here. |
c877efb2 | 534 | * |
19baf839 | 535 | * A clearer way to write this would be: |
c877efb2 | 536 | * |
19baf839 | 537 | * to_be_doubled = tn->full_children; |
c877efb2 | 538 | * not_to_be_doubled = tnode_child_length(tn) - tn->empty_children - |
19baf839 RO |
539 | * tn->full_children; |
540 | * | |
541 | * new_child_length = tnode_child_length(tn) * 2; | |
542 | * | |
c877efb2 | 543 | * new_fill_factor = 100 * (not_to_be_doubled + 2*to_be_doubled) / |
19baf839 RO |
544 | * new_child_length; |
545 | * if (new_fill_factor >= inflate_threshold) | |
c877efb2 SH |
546 | * |
547 | * ...and so on, tho it would mess up the while () loop. | |
548 | * | |
19baf839 RO |
549 | * anyway, |
550 | * 100 * (not_to_be_doubled + 2*to_be_doubled) / new_child_length >= | |
551 | * inflate_threshold | |
c877efb2 | 552 | * |
19baf839 RO |
553 | * avoid a division: |
554 | * 100 * (not_to_be_doubled + 2*to_be_doubled) >= | |
555 | * inflate_threshold * new_child_length | |
c877efb2 | 556 | * |
19baf839 | 557 | * expand not_to_be_doubled and to_be_doubled, and shorten: |
c877efb2 | 558 | * 100 * (tnode_child_length(tn) - tn->empty_children + |
91b9a277 | 559 | * tn->full_children) >= inflate_threshold * new_child_length |
c877efb2 | 560 | * |
19baf839 | 561 | * expand new_child_length: |
c877efb2 | 562 | * 100 * (tnode_child_length(tn) - tn->empty_children + |
91b9a277 | 563 | * tn->full_children) >= |
19baf839 | 564 | * inflate_threshold * tnode_child_length(tn) * 2 |
c877efb2 | 565 | * |
19baf839 | 566 | * shorten again: |
c877efb2 | 567 | * 50 * (tn->full_children + tnode_child_length(tn) - |
91b9a277 | 568 | * tn->empty_children) >= inflate_threshold * |
19baf839 | 569 | * tnode_child_length(tn) |
c877efb2 | 570 | * |
19baf839 RO |
571 | */ |
572 | ||
e6308be8 RO |
573 | /* Keep root node larger */ |
574 | ||
64c9b6fb | 575 | if (!node_parent(tn)) { |
80b71b80 JL |
576 | inflate_threshold_use = inflate_threshold_root; |
577 | halve_threshold_use = halve_threshold_root; | |
a034ee3c | 578 | } else { |
e6308be8 | 579 | inflate_threshold_use = inflate_threshold; |
80b71b80 JL |
580 | halve_threshold_use = halve_threshold; |
581 | } | |
e6308be8 | 582 | |
80b71b80 JL |
583 | max_work = MAX_WORK; |
584 | while ((tn->full_children > 0 && max_work-- && | |
a07f5f50 SH |
585 | 50 * (tn->full_children + tnode_child_length(tn) |
586 | - tn->empty_children) | |
587 | >= inflate_threshold_use * tnode_child_length(tn))) { | |
19baf839 | 588 | |
2f80b3c8 RO |
589 | old_tn = tn; |
590 | tn = inflate(t, tn); | |
a07f5f50 | 591 | |
2f80b3c8 RO |
592 | if (IS_ERR(tn)) { |
593 | tn = old_tn; | |
2f36895a | 594 | #ifdef CONFIG_IP_FIB_TRIE_STATS |
8274a97a | 595 | this_cpu_inc(t->stats->resize_node_skipped); |
2f36895a RO |
596 | #endif |
597 | break; | |
598 | } | |
19baf839 RO |
599 | } |
600 | ||
80b71b80 | 601 | /* Return if at least one inflate is run */ |
a034ee3c | 602 | if (max_work != MAX_WORK) |
adaf9816 | 603 | return tn; |
80b71b80 | 604 | |
19baf839 RO |
605 | /* |
606 | * Halve as long as the number of empty children in this | |
607 | * node is above threshold. | |
608 | */ | |
2f36895a | 609 | |
80b71b80 JL |
610 | max_work = MAX_WORK; |
611 | while (tn->bits > 1 && max_work-- && | |
19baf839 | 612 | 100 * (tnode_child_length(tn) - tn->empty_children) < |
e6308be8 | 613 | halve_threshold_use * tnode_child_length(tn)) { |
2f36895a | 614 | |
2f80b3c8 RO |
615 | old_tn = tn; |
616 | tn = halve(t, tn); | |
617 | if (IS_ERR(tn)) { | |
618 | tn = old_tn; | |
2f36895a | 619 | #ifdef CONFIG_IP_FIB_TRIE_STATS |
8274a97a | 620 | this_cpu_inc(t->stats->resize_node_skipped); |
2f36895a RO |
621 | #endif |
622 | break; | |
623 | } | |
624 | } | |
19baf839 | 625 | |
c877efb2 | 626 | |
19baf839 | 627 | /* Only one child remains */ |
64c9b6fb AD |
628 | if (tn->empty_children == (tnode_child_length(tn) - 1)) { |
629 | unsigned long i; | |
80b71b80 | 630 | one_child: |
64c9b6fb AD |
631 | for (i = tnode_child_length(tn); !n && i;) |
632 | n = tnode_get_child(tn, --i); | |
633 | no_children: | |
634 | /* compress one level */ | |
635 | node_set_parent(n, NULL); | |
636 | tnode_free_safe(tn); | |
637 | return n; | |
80b71b80 | 638 | } |
adaf9816 | 639 | return tn; |
19baf839 RO |
640 | } |
641 | ||
0a5c0475 ED |
642 | |
643 | static void tnode_clean_free(struct tnode *tn) | |
644 | { | |
adaf9816 | 645 | struct tnode *tofree; |
0a5c0475 | 646 | int i; |
0a5c0475 ED |
647 | |
648 | for (i = 0; i < tnode_child_length(tn); i++) { | |
37fd30f2 | 649 | tofree = rtnl_dereference(tn->child[i]); |
0a5c0475 | 650 | if (tofree) |
37fd30f2 | 651 | node_free(tofree); |
0a5c0475 | 652 | } |
37fd30f2 | 653 | node_free(tn); |
0a5c0475 ED |
654 | } |
655 | ||
adaf9816 | 656 | static struct tnode *inflate(struct trie *t, struct tnode *oldtnode) |
19baf839 | 657 | { |
adaf9816 AD |
658 | int olen = tnode_child_length(oldtnode); |
659 | struct tnode *tn; | |
19baf839 RO |
660 | int i; |
661 | ||
0c7770c7 | 662 | pr_debug("In inflate\n"); |
19baf839 RO |
663 | |
664 | tn = tnode_new(oldtnode->key, oldtnode->pos, oldtnode->bits + 1); | |
665 | ||
0c7770c7 | 666 | if (!tn) |
2f80b3c8 | 667 | return ERR_PTR(-ENOMEM); |
2f36895a RO |
668 | |
669 | /* | |
c877efb2 SH |
670 | * Preallocate and store tnodes before the actual work so we |
671 | * don't get into an inconsistent state if memory allocation | |
672 | * fails. In case of failure we return the oldnode and inflate | |
2f36895a RO |
673 | * of tnode is ignored. |
674 | */ | |
91b9a277 OJ |
675 | |
676 | for (i = 0; i < olen; i++) { | |
a07f5f50 | 677 | struct tnode *inode; |
2f36895a | 678 | |
adaf9816 AD |
679 | inode = tnode_get_child(oldtnode, i); |
680 | if (tnode_full(oldtnode, inode) && inode->bits > 1) { | |
2f36895a | 681 | struct tnode *left, *right; |
ab66b4a7 | 682 | t_key m = ~0U << (KEYLENGTH - 1) >> inode->pos; |
c877efb2 | 683 | |
2f36895a RO |
684 | left = tnode_new(inode->key&(~m), inode->pos + 1, |
685 | inode->bits - 1); | |
2f80b3c8 RO |
686 | if (!left) |
687 | goto nomem; | |
91b9a277 | 688 | |
2f36895a RO |
689 | right = tnode_new(inode->key|m, inode->pos + 1, |
690 | inode->bits - 1); | |
691 | ||
e905a9ed | 692 | if (!right) { |
37fd30f2 | 693 | node_free(left); |
2f80b3c8 | 694 | goto nomem; |
e905a9ed | 695 | } |
2f36895a | 696 | |
adaf9816 AD |
697 | put_child(tn, 2*i, left); |
698 | put_child(tn, 2*i+1, right); | |
2f36895a RO |
699 | } |
700 | } | |
701 | ||
91b9a277 | 702 | for (i = 0; i < olen; i++) { |
adaf9816 | 703 | struct tnode *inode = tnode_get_child(oldtnode, i); |
91b9a277 OJ |
704 | struct tnode *left, *right; |
705 | int size, j; | |
c877efb2 | 706 | |
19baf839 | 707 | /* An empty child */ |
adaf9816 | 708 | if (inode == NULL) |
19baf839 RO |
709 | continue; |
710 | ||
711 | /* A leaf or an internal node with skipped bits */ | |
adaf9816 | 712 | if (!tnode_full(oldtnode, inode)) { |
bbe34cf8 | 713 | put_child(tn, |
adaf9816 AD |
714 | tkey_extract_bits(inode->key, tn->pos, tn->bits), |
715 | inode); | |
19baf839 RO |
716 | continue; |
717 | } | |
718 | ||
719 | /* An internal node with two children */ | |
19baf839 | 720 | if (inode->bits == 1) { |
61648d91 LM |
721 | put_child(tn, 2*i, rtnl_dereference(inode->child[0])); |
722 | put_child(tn, 2*i+1, rtnl_dereference(inode->child[1])); | |
19baf839 | 723 | |
e0f7cb8c | 724 | tnode_free_safe(inode); |
91b9a277 | 725 | continue; |
19baf839 RO |
726 | } |
727 | ||
91b9a277 OJ |
728 | /* An internal node with more than two children */ |
729 | ||
730 | /* We will replace this node 'inode' with two new | |
731 | * ones, 'left' and 'right', each with half of the | |
732 | * original children. The two new nodes will have | |
733 | * a position one bit further down the key and this | |
734 | * means that the "significant" part of their keys | |
735 | * (see the discussion near the top of this file) | |
736 | * will differ by one bit, which will be "0" in | |
737 | * left's key and "1" in right's key. Since we are | |
738 | * moving the key position by one step, the bit that | |
739 | * we are moving away from - the bit at position | |
740 | * (inode->pos) - is the one that will differ between | |
741 | * left and right. So... we synthesize that bit in the | |
742 | * two new keys. | |
743 | * The mask 'm' below will be a single "one" bit at | |
744 | * the position (inode->pos) | |
745 | */ | |
19baf839 | 746 | |
91b9a277 OJ |
747 | /* Use the old key, but set the new significant |
748 | * bit to zero. | |
749 | */ | |
2f36895a | 750 | |
adaf9816 | 751 | left = tnode_get_child(tn, 2*i); |
61648d91 | 752 | put_child(tn, 2*i, NULL); |
2f36895a | 753 | |
91b9a277 | 754 | BUG_ON(!left); |
2f36895a | 755 | |
adaf9816 | 756 | right = tnode_get_child(tn, 2*i+1); |
61648d91 | 757 | put_child(tn, 2*i+1, NULL); |
19baf839 | 758 | |
91b9a277 | 759 | BUG_ON(!right); |
19baf839 | 760 | |
91b9a277 OJ |
761 | size = tnode_child_length(left); |
762 | for (j = 0; j < size; j++) { | |
61648d91 LM |
763 | put_child(left, j, rtnl_dereference(inode->child[j])); |
764 | put_child(right, j, rtnl_dereference(inode->child[j + size])); | |
19baf839 | 765 | } |
61648d91 LM |
766 | put_child(tn, 2*i, resize(t, left)); |
767 | put_child(tn, 2*i+1, resize(t, right)); | |
91b9a277 | 768 | |
e0f7cb8c | 769 | tnode_free_safe(inode); |
19baf839 | 770 | } |
e0f7cb8c | 771 | tnode_free_safe(oldtnode); |
19baf839 | 772 | return tn; |
2f80b3c8 | 773 | nomem: |
0a5c0475 ED |
774 | tnode_clean_free(tn); |
775 | return ERR_PTR(-ENOMEM); | |
19baf839 RO |
776 | } |
777 | ||
adaf9816 | 778 | static struct tnode *halve(struct trie *t, struct tnode *oldtnode) |
19baf839 | 779 | { |
adaf9816 AD |
780 | int olen = tnode_child_length(oldtnode); |
781 | struct tnode *tn, *left, *right; | |
19baf839 | 782 | int i; |
19baf839 | 783 | |
0c7770c7 | 784 | pr_debug("In halve\n"); |
c877efb2 SH |
785 | |
786 | tn = tnode_new(oldtnode->key, oldtnode->pos, oldtnode->bits - 1); | |
19baf839 | 787 | |
2f80b3c8 RO |
788 | if (!tn) |
789 | return ERR_PTR(-ENOMEM); | |
2f36895a RO |
790 | |
791 | /* | |
c877efb2 SH |
792 | * Preallocate and store tnodes before the actual work so we |
793 | * don't get into an inconsistent state if memory allocation | |
794 | * fails. In case of failure we return the oldnode and halve | |
2f36895a RO |
795 | * of tnode is ignored. |
796 | */ | |
797 | ||
91b9a277 | 798 | for (i = 0; i < olen; i += 2) { |
2f36895a RO |
799 | left = tnode_get_child(oldtnode, i); |
800 | right = tnode_get_child(oldtnode, i+1); | |
c877efb2 | 801 | |
2f36895a | 802 | /* Two nonempty children */ |
0c7770c7 | 803 | if (left && right) { |
2f80b3c8 | 804 | struct tnode *newn; |
0c7770c7 | 805 | |
2f80b3c8 | 806 | newn = tnode_new(left->key, tn->pos + tn->bits, 1); |
0c7770c7 SH |
807 | |
808 | if (!newn) | |
2f80b3c8 | 809 | goto nomem; |
0c7770c7 | 810 | |
adaf9816 | 811 | put_child(tn, i/2, newn); |
2f36895a | 812 | } |
2f36895a | 813 | |
2f36895a | 814 | } |
19baf839 | 815 | |
91b9a277 OJ |
816 | for (i = 0; i < olen; i += 2) { |
817 | struct tnode *newBinNode; | |
818 | ||
19baf839 RO |
819 | left = tnode_get_child(oldtnode, i); |
820 | right = tnode_get_child(oldtnode, i+1); | |
c877efb2 | 821 | |
19baf839 RO |
822 | /* At least one of the children is empty */ |
823 | if (left == NULL) { | |
824 | if (right == NULL) /* Both are empty */ | |
825 | continue; | |
61648d91 | 826 | put_child(tn, i/2, right); |
91b9a277 | 827 | continue; |
0c7770c7 | 828 | } |
91b9a277 OJ |
829 | |
830 | if (right == NULL) { | |
61648d91 | 831 | put_child(tn, i/2, left); |
91b9a277 OJ |
832 | continue; |
833 | } | |
c877efb2 | 834 | |
19baf839 | 835 | /* Two nonempty children */ |
adaf9816 | 836 | newBinNode = tnode_get_child(tn, i/2); |
61648d91 LM |
837 | put_child(tn, i/2, NULL); |
838 | put_child(newBinNode, 0, left); | |
839 | put_child(newBinNode, 1, right); | |
840 | put_child(tn, i/2, resize(t, newBinNode)); | |
19baf839 | 841 | } |
e0f7cb8c | 842 | tnode_free_safe(oldtnode); |
19baf839 | 843 | return tn; |
2f80b3c8 | 844 | nomem: |
0a5c0475 ED |
845 | tnode_clean_free(tn); |
846 | return ERR_PTR(-ENOMEM); | |
19baf839 RO |
847 | } |
848 | ||
772cb712 | 849 | /* readside must use rcu_read_lock currently dump routines |
2373ce1c RO |
850 | via get_fa_head and dump */ |
851 | ||
adaf9816 | 852 | static struct leaf_info *find_leaf_info(struct tnode *l, int plen) |
19baf839 | 853 | { |
772cb712 | 854 | struct hlist_head *head = &l->list; |
19baf839 RO |
855 | struct leaf_info *li; |
856 | ||
b67bfe0d | 857 | hlist_for_each_entry_rcu(li, head, hlist) |
c877efb2 | 858 | if (li->plen == plen) |
19baf839 | 859 | return li; |
91b9a277 | 860 | |
19baf839 RO |
861 | return NULL; |
862 | } | |
863 | ||
adaf9816 | 864 | static inline struct list_head *get_fa_head(struct tnode *l, int plen) |
19baf839 | 865 | { |
772cb712 | 866 | struct leaf_info *li = find_leaf_info(l, plen); |
c877efb2 | 867 | |
91b9a277 OJ |
868 | if (!li) |
869 | return NULL; | |
c877efb2 | 870 | |
91b9a277 | 871 | return &li->falh; |
19baf839 RO |
872 | } |
873 | ||
874 | static void insert_leaf_info(struct hlist_head *head, struct leaf_info *new) | |
875 | { | |
e905a9ed | 876 | struct leaf_info *li = NULL, *last = NULL; |
e905a9ed YH |
877 | |
878 | if (hlist_empty(head)) { | |
879 | hlist_add_head_rcu(&new->hlist, head); | |
880 | } else { | |
b67bfe0d | 881 | hlist_for_each_entry(li, head, hlist) { |
e905a9ed YH |
882 | if (new->plen > li->plen) |
883 | break; | |
884 | ||
885 | last = li; | |
886 | } | |
887 | if (last) | |
1d023284 | 888 | hlist_add_behind_rcu(&new->hlist, &last->hlist); |
e905a9ed YH |
889 | else |
890 | hlist_add_before_rcu(&new->hlist, &li->hlist); | |
891 | } | |
19baf839 RO |
892 | } |
893 | ||
2373ce1c RO |
894 | /* rcu_read_lock needs to be hold by caller from readside */ |
895 | ||
adaf9816 | 896 | static struct tnode *fib_find_node(struct trie *t, u32 key) |
19baf839 | 897 | { |
adaf9816 AD |
898 | struct tnode *n = rcu_dereference_rtnl(t->trie); |
899 | int pos = 0; | |
19baf839 | 900 | |
64c9b6fb | 901 | while (n && IS_TNODE(n)) { |
adaf9816 AD |
902 | if (tkey_sub_equals(n->key, pos, n->pos-pos, key)) { |
903 | pos = n->pos + n->bits; | |
904 | n = tnode_get_child_rcu(n, | |
a07f5f50 | 905 | tkey_extract_bits(key, |
adaf9816 AD |
906 | n->pos, |
907 | n->bits)); | |
91b9a277 | 908 | } else |
19baf839 RO |
909 | break; |
910 | } | |
911 | /* Case we have found a leaf. Compare prefixes */ | |
912 | ||
91b9a277 | 913 | if (n != NULL && IS_LEAF(n) && tkey_equals(key, n->key)) |
adaf9816 | 914 | return n; |
91b9a277 | 915 | |
19baf839 RO |
916 | return NULL; |
917 | } | |
918 | ||
7b85576d | 919 | static void trie_rebalance(struct trie *t, struct tnode *tn) |
19baf839 | 920 | { |
19baf839 | 921 | int wasfull; |
3ed18d76 | 922 | t_key cindex, key; |
06801916 | 923 | struct tnode *tp; |
19baf839 | 924 | |
3ed18d76 RO |
925 | key = tn->key; |
926 | ||
64c9b6fb | 927 | while (tn != NULL && (tp = node_parent(tn)) != NULL) { |
19baf839 RO |
928 | cindex = tkey_extract_bits(key, tp->pos, tp->bits); |
929 | wasfull = tnode_full(tp, tnode_get_child(tp, cindex)); | |
adaf9816 | 930 | tn = resize(t, tn); |
a07f5f50 | 931 | |
adaf9816 | 932 | tnode_put_child_reorg(tp, cindex, tn, wasfull); |
91b9a277 | 933 | |
64c9b6fb | 934 | tp = node_parent(tn); |
008440e3 | 935 | if (!tp) |
adaf9816 | 936 | rcu_assign_pointer(t->trie, tn); |
008440e3 | 937 | |
e0f7cb8c | 938 | tnode_free_flush(); |
06801916 | 939 | if (!tp) |
19baf839 | 940 | break; |
06801916 | 941 | tn = tp; |
19baf839 | 942 | } |
06801916 | 943 | |
19baf839 | 944 | /* Handle last (top) tnode */ |
7b85576d | 945 | if (IS_TNODE(tn)) |
adaf9816 | 946 | tn = resize(t, tn); |
19baf839 | 947 | |
adaf9816 | 948 | rcu_assign_pointer(t->trie, tn); |
7b85576d | 949 | tnode_free_flush(); |
19baf839 RO |
950 | } |
951 | ||
2373ce1c RO |
952 | /* only used from updater-side */ |
953 | ||
fea86ad8 | 954 | static struct list_head *fib_insert_node(struct trie *t, u32 key, int plen) |
19baf839 RO |
955 | { |
956 | int pos, newpos; | |
957 | struct tnode *tp = NULL, *tn = NULL; | |
adaf9816 AD |
958 | struct tnode *n; |
959 | struct tnode *l; | |
19baf839 | 960 | int missbit; |
c877efb2 | 961 | struct list_head *fa_head = NULL; |
19baf839 RO |
962 | struct leaf_info *li; |
963 | t_key cindex; | |
964 | ||
965 | pos = 0; | |
0a5c0475 | 966 | n = rtnl_dereference(t->trie); |
19baf839 | 967 | |
c877efb2 SH |
968 | /* If we point to NULL, stop. Either the tree is empty and we should |
969 | * just put a new leaf in if, or we have reached an empty child slot, | |
19baf839 | 970 | * and we should just put our new leaf in that. |
c877efb2 SH |
971 | * If we point to a T_TNODE, check if it matches our key. Note that |
972 | * a T_TNODE might be skipping any number of bits - its 'pos' need | |
19baf839 RO |
973 | * not be the parent's 'pos'+'bits'! |
974 | * | |
c877efb2 | 975 | * If it does match the current key, get pos/bits from it, extract |
19baf839 RO |
976 | * the index from our key, push the T_TNODE and walk the tree. |
977 | * | |
978 | * If it doesn't, we have to replace it with a new T_TNODE. | |
979 | * | |
c877efb2 SH |
980 | * If we point to a T_LEAF, it might or might not have the same key |
981 | * as we do. If it does, just change the value, update the T_LEAF's | |
982 | * value, and return it. | |
19baf839 RO |
983 | * If it doesn't, we need to replace it with a T_TNODE. |
984 | */ | |
985 | ||
64c9b6fb | 986 | while (n && IS_TNODE(n)) { |
adaf9816 AD |
987 | if (tkey_sub_equals(n->key, pos, n->pos-pos, key)) { |
988 | tp = n; | |
989 | pos = n->pos + n->bits; | |
990 | n = tnode_get_child(n, | |
a07f5f50 | 991 | tkey_extract_bits(key, |
adaf9816 AD |
992 | n->pos, |
993 | n->bits)); | |
19baf839 | 994 | |
adaf9816 | 995 | BUG_ON(n && node_parent(n) != tp); |
91b9a277 | 996 | } else |
19baf839 RO |
997 | break; |
998 | } | |
999 | ||
1000 | /* | |
1001 | * n ----> NULL, LEAF or TNODE | |
1002 | * | |
c877efb2 | 1003 | * tp is n's (parent) ----> NULL or TNODE |
19baf839 RO |
1004 | */ |
1005 | ||
91b9a277 | 1006 | BUG_ON(tp && IS_LEAF(tp)); |
19baf839 RO |
1007 | |
1008 | /* Case 1: n is a leaf. Compare prefixes */ | |
1009 | ||
c877efb2 | 1010 | if (n != NULL && IS_LEAF(n) && tkey_equals(key, n->key)) { |
19baf839 | 1011 | li = leaf_info_new(plen); |
91b9a277 | 1012 | |
fea86ad8 SH |
1013 | if (!li) |
1014 | return NULL; | |
19baf839 RO |
1015 | |
1016 | fa_head = &li->falh; | |
adaf9816 | 1017 | insert_leaf_info(&n->list, li); |
19baf839 RO |
1018 | goto done; |
1019 | } | |
64c9b6fb | 1020 | l = leaf_new(key); |
19baf839 | 1021 | |
fea86ad8 SH |
1022 | if (!l) |
1023 | return NULL; | |
19baf839 | 1024 | |
19baf839 RO |
1025 | li = leaf_info_new(plen); |
1026 | ||
c877efb2 | 1027 | if (!li) { |
37fd30f2 | 1028 | node_free(l); |
fea86ad8 | 1029 | return NULL; |
f835e471 | 1030 | } |
19baf839 RO |
1031 | |
1032 | fa_head = &li->falh; | |
1033 | insert_leaf_info(&l->list, li); | |
1034 | ||
19baf839 | 1035 | if (t->trie && n == NULL) { |
91b9a277 | 1036 | /* Case 2: n is NULL, and will just insert a new leaf */ |
19baf839 | 1037 | |
adaf9816 | 1038 | node_set_parent(l, tp); |
19baf839 | 1039 | |
91b9a277 | 1040 | cindex = tkey_extract_bits(key, tp->pos, tp->bits); |
adaf9816 | 1041 | put_child(tp, cindex, l); |
91b9a277 OJ |
1042 | } else { |
1043 | /* Case 3: n is a LEAF or a TNODE and the key doesn't match. */ | |
c877efb2 SH |
1044 | /* |
1045 | * Add a new tnode here | |
19baf839 RO |
1046 | * first tnode need some special handling |
1047 | */ | |
1048 | ||
c877efb2 | 1049 | if (n) { |
4c60f1d6 | 1050 | pos = tp ? tp->pos+tp->bits : 0; |
19baf839 RO |
1051 | newpos = tkey_mismatch(key, pos, n->key); |
1052 | tn = tnode_new(n->key, newpos, 1); | |
91b9a277 | 1053 | } else { |
19baf839 | 1054 | newpos = 0; |
c877efb2 | 1055 | tn = tnode_new(key, newpos, 1); /* First tnode */ |
19baf839 | 1056 | } |
19baf839 | 1057 | |
c877efb2 | 1058 | if (!tn) { |
f835e471 | 1059 | free_leaf_info(li); |
37fd30f2 | 1060 | node_free(l); |
fea86ad8 | 1061 | return NULL; |
91b9a277 OJ |
1062 | } |
1063 | ||
adaf9816 | 1064 | node_set_parent(tn, tp); |
19baf839 | 1065 | |
91b9a277 | 1066 | missbit = tkey_extract_bits(key, newpos, 1); |
adaf9816 | 1067 | put_child(tn, missbit, l); |
61648d91 | 1068 | put_child(tn, 1-missbit, n); |
19baf839 | 1069 | |
c877efb2 | 1070 | if (tp) { |
19baf839 | 1071 | cindex = tkey_extract_bits(key, tp->pos, tp->bits); |
adaf9816 | 1072 | put_child(tp, cindex, tn); |
91b9a277 | 1073 | } else { |
adaf9816 | 1074 | rcu_assign_pointer(t->trie, tn); |
19baf839 | 1075 | } |
e962f302 AD |
1076 | |
1077 | tp = tn; | |
19baf839 | 1078 | } |
91b9a277 OJ |
1079 | |
1080 | if (tp && tp->pos + tp->bits > 32) | |
058bd4d2 JP |
1081 | pr_warn("fib_trie tp=%p pos=%d, bits=%d, key=%0x plen=%d\n", |
1082 | tp, tp->pos, tp->bits, key, plen); | |
91b9a277 | 1083 | |
19baf839 | 1084 | /* Rebalance the trie */ |
2373ce1c | 1085 | |
7b85576d | 1086 | trie_rebalance(t, tp); |
f835e471 | 1087 | done: |
19baf839 RO |
1088 | return fa_head; |
1089 | } | |
1090 | ||
d562f1f8 RO |
1091 | /* |
1092 | * Caller must hold RTNL. | |
1093 | */ | |
16c6cf8b | 1094 | int fib_table_insert(struct fib_table *tb, struct fib_config *cfg) |
19baf839 RO |
1095 | { |
1096 | struct trie *t = (struct trie *) tb->tb_data; | |
1097 | struct fib_alias *fa, *new_fa; | |
c877efb2 | 1098 | struct list_head *fa_head = NULL; |
19baf839 | 1099 | struct fib_info *fi; |
4e902c57 TG |
1100 | int plen = cfg->fc_dst_len; |
1101 | u8 tos = cfg->fc_tos; | |
19baf839 RO |
1102 | u32 key, mask; |
1103 | int err; | |
adaf9816 | 1104 | struct tnode *l; |
19baf839 RO |
1105 | |
1106 | if (plen > 32) | |
1107 | return -EINVAL; | |
1108 | ||
4e902c57 | 1109 | key = ntohl(cfg->fc_dst); |
19baf839 | 1110 | |
2dfe55b4 | 1111 | pr_debug("Insert table=%u %08x/%d\n", tb->tb_id, key, plen); |
19baf839 | 1112 | |
91b9a277 | 1113 | mask = ntohl(inet_make_mask(plen)); |
19baf839 | 1114 | |
c877efb2 | 1115 | if (key & ~mask) |
19baf839 RO |
1116 | return -EINVAL; |
1117 | ||
1118 | key = key & mask; | |
1119 | ||
4e902c57 TG |
1120 | fi = fib_create_info(cfg); |
1121 | if (IS_ERR(fi)) { | |
1122 | err = PTR_ERR(fi); | |
19baf839 | 1123 | goto err; |
4e902c57 | 1124 | } |
19baf839 RO |
1125 | |
1126 | l = fib_find_node(t, key); | |
c877efb2 | 1127 | fa = NULL; |
19baf839 | 1128 | |
c877efb2 | 1129 | if (l) { |
19baf839 RO |
1130 | fa_head = get_fa_head(l, plen); |
1131 | fa = fib_find_alias(fa_head, tos, fi->fib_priority); | |
1132 | } | |
1133 | ||
1134 | /* Now fa, if non-NULL, points to the first fib alias | |
1135 | * with the same keys [prefix,tos,priority], if such key already | |
1136 | * exists or to the node before which we will insert new one. | |
1137 | * | |
1138 | * If fa is NULL, we will need to allocate a new one and | |
1139 | * insert to the head of f. | |
1140 | * | |
1141 | * If f is NULL, no fib node matched the destination key | |
1142 | * and we need to allocate a new one of those as well. | |
1143 | */ | |
1144 | ||
936f6f8e JA |
1145 | if (fa && fa->fa_tos == tos && |
1146 | fa->fa_info->fib_priority == fi->fib_priority) { | |
1147 | struct fib_alias *fa_first, *fa_match; | |
19baf839 RO |
1148 | |
1149 | err = -EEXIST; | |
4e902c57 | 1150 | if (cfg->fc_nlflags & NLM_F_EXCL) |
19baf839 RO |
1151 | goto out; |
1152 | ||
936f6f8e JA |
1153 | /* We have 2 goals: |
1154 | * 1. Find exact match for type, scope, fib_info to avoid | |
1155 | * duplicate routes | |
1156 | * 2. Find next 'fa' (or head), NLM_F_APPEND inserts before it | |
1157 | */ | |
1158 | fa_match = NULL; | |
1159 | fa_first = fa; | |
1160 | fa = list_entry(fa->fa_list.prev, struct fib_alias, fa_list); | |
1161 | list_for_each_entry_continue(fa, fa_head, fa_list) { | |
1162 | if (fa->fa_tos != tos) | |
1163 | break; | |
1164 | if (fa->fa_info->fib_priority != fi->fib_priority) | |
1165 | break; | |
1166 | if (fa->fa_type == cfg->fc_type && | |
936f6f8e JA |
1167 | fa->fa_info == fi) { |
1168 | fa_match = fa; | |
1169 | break; | |
1170 | } | |
1171 | } | |
1172 | ||
4e902c57 | 1173 | if (cfg->fc_nlflags & NLM_F_REPLACE) { |
19baf839 RO |
1174 | struct fib_info *fi_drop; |
1175 | u8 state; | |
1176 | ||
936f6f8e JA |
1177 | fa = fa_first; |
1178 | if (fa_match) { | |
1179 | if (fa == fa_match) | |
1180 | err = 0; | |
6725033f | 1181 | goto out; |
936f6f8e | 1182 | } |
2373ce1c | 1183 | err = -ENOBUFS; |
e94b1766 | 1184 | new_fa = kmem_cache_alloc(fn_alias_kmem, GFP_KERNEL); |
2373ce1c RO |
1185 | if (new_fa == NULL) |
1186 | goto out; | |
19baf839 RO |
1187 | |
1188 | fi_drop = fa->fa_info; | |
2373ce1c RO |
1189 | new_fa->fa_tos = fa->fa_tos; |
1190 | new_fa->fa_info = fi; | |
4e902c57 | 1191 | new_fa->fa_type = cfg->fc_type; |
19baf839 | 1192 | state = fa->fa_state; |
936f6f8e | 1193 | new_fa->fa_state = state & ~FA_S_ACCESSED; |
19baf839 | 1194 | |
2373ce1c RO |
1195 | list_replace_rcu(&fa->fa_list, &new_fa->fa_list); |
1196 | alias_free_mem_rcu(fa); | |
19baf839 RO |
1197 | |
1198 | fib_release_info(fi_drop); | |
1199 | if (state & FA_S_ACCESSED) | |
4ccfe6d4 | 1200 | rt_cache_flush(cfg->fc_nlinfo.nl_net); |
b8f55831 MK |
1201 | rtmsg_fib(RTM_NEWROUTE, htonl(key), new_fa, plen, |
1202 | tb->tb_id, &cfg->fc_nlinfo, NLM_F_REPLACE); | |
19baf839 | 1203 | |
91b9a277 | 1204 | goto succeeded; |
19baf839 RO |
1205 | } |
1206 | /* Error if we find a perfect match which | |
1207 | * uses the same scope, type, and nexthop | |
1208 | * information. | |
1209 | */ | |
936f6f8e JA |
1210 | if (fa_match) |
1211 | goto out; | |
a07f5f50 | 1212 | |
4e902c57 | 1213 | if (!(cfg->fc_nlflags & NLM_F_APPEND)) |
936f6f8e | 1214 | fa = fa_first; |
19baf839 RO |
1215 | } |
1216 | err = -ENOENT; | |
4e902c57 | 1217 | if (!(cfg->fc_nlflags & NLM_F_CREATE)) |
19baf839 RO |
1218 | goto out; |
1219 | ||
1220 | err = -ENOBUFS; | |
e94b1766 | 1221 | new_fa = kmem_cache_alloc(fn_alias_kmem, GFP_KERNEL); |
19baf839 RO |
1222 | if (new_fa == NULL) |
1223 | goto out; | |
1224 | ||
1225 | new_fa->fa_info = fi; | |
1226 | new_fa->fa_tos = tos; | |
4e902c57 | 1227 | new_fa->fa_type = cfg->fc_type; |
19baf839 | 1228 | new_fa->fa_state = 0; |
19baf839 RO |
1229 | /* |
1230 | * Insert new entry to the list. | |
1231 | */ | |
1232 | ||
c877efb2 | 1233 | if (!fa_head) { |
fea86ad8 SH |
1234 | fa_head = fib_insert_node(t, key, plen); |
1235 | if (unlikely(!fa_head)) { | |
1236 | err = -ENOMEM; | |
f835e471 | 1237 | goto out_free_new_fa; |
fea86ad8 | 1238 | } |
f835e471 | 1239 | } |
19baf839 | 1240 | |
21d8c49e DM |
1241 | if (!plen) |
1242 | tb->tb_num_default++; | |
1243 | ||
2373ce1c RO |
1244 | list_add_tail_rcu(&new_fa->fa_list, |
1245 | (fa ? &fa->fa_list : fa_head)); | |
19baf839 | 1246 | |
4ccfe6d4 | 1247 | rt_cache_flush(cfg->fc_nlinfo.nl_net); |
4e902c57 | 1248 | rtmsg_fib(RTM_NEWROUTE, htonl(key), new_fa, plen, tb->tb_id, |
b8f55831 | 1249 | &cfg->fc_nlinfo, 0); |
19baf839 RO |
1250 | succeeded: |
1251 | return 0; | |
f835e471 RO |
1252 | |
1253 | out_free_new_fa: | |
1254 | kmem_cache_free(fn_alias_kmem, new_fa); | |
19baf839 RO |
1255 | out: |
1256 | fib_release_info(fi); | |
91b9a277 | 1257 | err: |
19baf839 RO |
1258 | return err; |
1259 | } | |
1260 | ||
772cb712 | 1261 | /* should be called with rcu_read_lock */ |
adaf9816 | 1262 | static int check_leaf(struct fib_table *tb, struct trie *t, struct tnode *l, |
22bd5b9b | 1263 | t_key key, const struct flowi4 *flp, |
ebc0ffae | 1264 | struct fib_result *res, int fib_flags) |
19baf839 | 1265 | { |
19baf839 RO |
1266 | struct leaf_info *li; |
1267 | struct hlist_head *hhead = &l->list; | |
c877efb2 | 1268 | |
b67bfe0d | 1269 | hlist_for_each_entry_rcu(li, hhead, hlist) { |
3be0686b | 1270 | struct fib_alias *fa; |
a07f5f50 | 1271 | |
5c74501f | 1272 | if (l->key != (key & li->mask_plen)) |
19baf839 RO |
1273 | continue; |
1274 | ||
3be0686b DM |
1275 | list_for_each_entry_rcu(fa, &li->falh, fa_list) { |
1276 | struct fib_info *fi = fa->fa_info; | |
1277 | int nhsel, err; | |
a07f5f50 | 1278 | |
22bd5b9b | 1279 | if (fa->fa_tos && fa->fa_tos != flp->flowi4_tos) |
3be0686b | 1280 | continue; |
dccd9ecc DM |
1281 | if (fi->fib_dead) |
1282 | continue; | |
37e826c5 | 1283 | if (fa->fa_info->fib_scope < flp->flowi4_scope) |
3be0686b DM |
1284 | continue; |
1285 | fib_alias_accessed(fa); | |
1286 | err = fib_props[fa->fa_type].error; | |
9f9e636d | 1287 | if (unlikely(err < 0)) { |
19baf839 | 1288 | #ifdef CONFIG_IP_FIB_TRIE_STATS |
8274a97a | 1289 | this_cpu_inc(t->stats->semantic_match_passed); |
3be0686b | 1290 | #endif |
1fbc7843 | 1291 | return err; |
3be0686b DM |
1292 | } |
1293 | if (fi->fib_flags & RTNH_F_DEAD) | |
1294 | continue; | |
1295 | for (nhsel = 0; nhsel < fi->fib_nhs; nhsel++) { | |
1296 | const struct fib_nh *nh = &fi->fib_nh[nhsel]; | |
1297 | ||
1298 | if (nh->nh_flags & RTNH_F_DEAD) | |
1299 | continue; | |
22bd5b9b | 1300 | if (flp->flowi4_oif && flp->flowi4_oif != nh->nh_oif) |
3be0686b DM |
1301 | continue; |
1302 | ||
1303 | #ifdef CONFIG_IP_FIB_TRIE_STATS | |
8274a97a | 1304 | this_cpu_inc(t->stats->semantic_match_passed); |
3be0686b | 1305 | #endif |
5c74501f | 1306 | res->prefixlen = li->plen; |
3be0686b DM |
1307 | res->nh_sel = nhsel; |
1308 | res->type = fa->fa_type; | |
9f9e636d | 1309 | res->scope = fi->fib_scope; |
3be0686b DM |
1310 | res->fi = fi; |
1311 | res->table = tb; | |
1312 | res->fa_head = &li->falh; | |
1313 | if (!(fib_flags & FIB_LOOKUP_NOREF)) | |
5c74501f | 1314 | atomic_inc(&fi->fib_clntref); |
3be0686b DM |
1315 | return 0; |
1316 | } | |
1317 | } | |
1318 | ||
1319 | #ifdef CONFIG_IP_FIB_TRIE_STATS | |
8274a97a | 1320 | this_cpu_inc(t->stats->semantic_match_miss); |
19baf839 | 1321 | #endif |
19baf839 | 1322 | } |
a07f5f50 | 1323 | |
2e655571 | 1324 | return 1; |
19baf839 RO |
1325 | } |
1326 | ||
9f9e636d AD |
1327 | static inline t_key prefix_mismatch(t_key key, struct tnode *n) |
1328 | { | |
1329 | t_key prefix = n->key; | |
1330 | ||
1331 | return (key ^ prefix) & (prefix | -prefix); | |
1332 | } | |
1333 | ||
22bd5b9b | 1334 | int fib_table_lookup(struct fib_table *tb, const struct flowi4 *flp, |
ebc0ffae | 1335 | struct fib_result *res, int fib_flags) |
19baf839 | 1336 | { |
9f9e636d | 1337 | struct trie *t = (struct trie *)tb->tb_data; |
8274a97a AD |
1338 | #ifdef CONFIG_IP_FIB_TRIE_STATS |
1339 | struct trie_use_stats __percpu *stats = t->stats; | |
1340 | #endif | |
9f9e636d AD |
1341 | const t_key key = ntohl(flp->daddr); |
1342 | struct tnode *n, *pn; | |
1343 | t_key cindex; | |
1344 | int ret = 1; | |
91b9a277 | 1345 | |
2373ce1c | 1346 | rcu_read_lock(); |
91b9a277 | 1347 | |
2373ce1c | 1348 | n = rcu_dereference(t->trie); |
c877efb2 | 1349 | if (!n) |
19baf839 RO |
1350 | goto failed; |
1351 | ||
1352 | #ifdef CONFIG_IP_FIB_TRIE_STATS | |
8274a97a | 1353 | this_cpu_inc(stats->gets); |
19baf839 RO |
1354 | #endif |
1355 | ||
adaf9816 | 1356 | pn = n; |
9f9e636d AD |
1357 | cindex = 0; |
1358 | ||
1359 | /* Step 1: Travel to the longest prefix match in the trie */ | |
1360 | for (;;) { | |
1361 | unsigned long index = get_index(key, n); | |
1362 | ||
1363 | /* This bit of code is a bit tricky but it combines multiple | |
1364 | * checks into a single check. The prefix consists of the | |
1365 | * prefix plus zeros for the "bits" in the prefix. The index | |
1366 | * is the difference between the key and this value. From | |
1367 | * this we can actually derive several pieces of data. | |
1368 | * if !(index >> bits) | |
1369 | * we know the value is child index | |
1370 | * else | |
1371 | * we have a mismatch in skip bits and failed | |
1372 | */ | |
1373 | if (index >> n->bits) | |
1374 | break; | |
19baf839 | 1375 | |
9f9e636d AD |
1376 | /* we have found a leaf. Prefixes have already been compared */ |
1377 | if (IS_LEAF(n)) | |
a07f5f50 | 1378 | goto found; |
19baf839 | 1379 | |
9f9e636d AD |
1380 | /* only record pn and cindex if we are going to be chopping |
1381 | * bits later. Otherwise we are just wasting cycles. | |
91b9a277 | 1382 | */ |
9f9e636d AD |
1383 | if (index) { |
1384 | pn = n; | |
1385 | cindex = index; | |
91b9a277 | 1386 | } |
19baf839 | 1387 | |
9f9e636d AD |
1388 | n = rcu_dereference(n->child[index]); |
1389 | if (unlikely(!n)) | |
1390 | goto backtrace; | |
1391 | } | |
19baf839 | 1392 | |
9f9e636d AD |
1393 | /* Step 2: Sort out leaves and begin backtracing for longest prefix */ |
1394 | for (;;) { | |
1395 | /* record the pointer where our next node pointer is stored */ | |
1396 | struct tnode __rcu **cptr = n->child; | |
19baf839 | 1397 | |
9f9e636d AD |
1398 | /* This test verifies that none of the bits that differ |
1399 | * between the key and the prefix exist in the region of | |
1400 | * the lsb and higher in the prefix. | |
91b9a277 | 1401 | */ |
9f9e636d AD |
1402 | if (unlikely(prefix_mismatch(key, n))) |
1403 | goto backtrace; | |
91b9a277 | 1404 | |
9f9e636d AD |
1405 | /* exit out and process leaf */ |
1406 | if (unlikely(IS_LEAF(n))) | |
1407 | break; | |
91b9a277 | 1408 | |
9f9e636d AD |
1409 | /* Don't bother recording parent info. Since we are in |
1410 | * prefix match mode we will have to come back to wherever | |
1411 | * we started this traversal anyway | |
91b9a277 | 1412 | */ |
91b9a277 | 1413 | |
9f9e636d | 1414 | while ((n = rcu_dereference(*cptr)) == NULL) { |
19baf839 | 1415 | backtrace: |
19baf839 | 1416 | #ifdef CONFIG_IP_FIB_TRIE_STATS |
9f9e636d AD |
1417 | if (!n) |
1418 | this_cpu_inc(stats->null_node_hit); | |
19baf839 | 1419 | #endif |
9f9e636d AD |
1420 | /* If we are at cindex 0 there are no more bits for |
1421 | * us to strip at this level so we must ascend back | |
1422 | * up one level to see if there are any more bits to | |
1423 | * be stripped there. | |
1424 | */ | |
1425 | while (!cindex) { | |
1426 | t_key pkey = pn->key; | |
1427 | ||
1428 | pn = node_parent_rcu(pn); | |
1429 | if (unlikely(!pn)) | |
1430 | goto failed; | |
1431 | #ifdef CONFIG_IP_FIB_TRIE_STATS | |
1432 | this_cpu_inc(stats->backtrack); | |
1433 | #endif | |
1434 | /* Get Child's index */ | |
1435 | cindex = get_index(pkey, pn); | |
1436 | } | |
1437 | ||
1438 | /* strip the least significant bit from the cindex */ | |
1439 | cindex &= cindex - 1; | |
1440 | ||
1441 | /* grab pointer for next child node */ | |
1442 | cptr = &pn->child[cindex]; | |
c877efb2 | 1443 | } |
19baf839 | 1444 | } |
9f9e636d | 1445 | |
19baf839 | 1446 | found: |
9f9e636d AD |
1447 | /* Step 3: Process the leaf, if that fails fall back to backtracing */ |
1448 | ret = check_leaf(tb, t, n, key, flp, res, fib_flags); | |
1449 | if (unlikely(ret > 0)) | |
1450 | goto backtrace; | |
1451 | failed: | |
2373ce1c | 1452 | rcu_read_unlock(); |
19baf839 RO |
1453 | return ret; |
1454 | } | |
6fc01438 | 1455 | EXPORT_SYMBOL_GPL(fib_table_lookup); |
19baf839 | 1456 | |
9195bef7 SH |
1457 | /* |
1458 | * Remove the leaf and return parent. | |
1459 | */ | |
adaf9816 | 1460 | static void trie_leaf_remove(struct trie *t, struct tnode *l) |
19baf839 | 1461 | { |
64c9b6fb | 1462 | struct tnode *tp = node_parent(l); |
c877efb2 | 1463 | |
9195bef7 | 1464 | pr_debug("entering trie_leaf_remove(%p)\n", l); |
19baf839 | 1465 | |
c877efb2 | 1466 | if (tp) { |
9195bef7 | 1467 | t_key cindex = tkey_extract_bits(l->key, tp->pos, tp->bits); |
61648d91 | 1468 | put_child(tp, cindex, NULL); |
7b85576d | 1469 | trie_rebalance(t, tp); |
91b9a277 | 1470 | } else |
a9b3cd7f | 1471 | RCU_INIT_POINTER(t->trie, NULL); |
19baf839 | 1472 | |
37fd30f2 | 1473 | node_free(l); |
19baf839 RO |
1474 | } |
1475 | ||
d562f1f8 RO |
1476 | /* |
1477 | * Caller must hold RTNL. | |
1478 | */ | |
16c6cf8b | 1479 | int fib_table_delete(struct fib_table *tb, struct fib_config *cfg) |
19baf839 RO |
1480 | { |
1481 | struct trie *t = (struct trie *) tb->tb_data; | |
1482 | u32 key, mask; | |
4e902c57 TG |
1483 | int plen = cfg->fc_dst_len; |
1484 | u8 tos = cfg->fc_tos; | |
19baf839 RO |
1485 | struct fib_alias *fa, *fa_to_delete; |
1486 | struct list_head *fa_head; | |
adaf9816 | 1487 | struct tnode *l; |
91b9a277 OJ |
1488 | struct leaf_info *li; |
1489 | ||
c877efb2 | 1490 | if (plen > 32) |
19baf839 RO |
1491 | return -EINVAL; |
1492 | ||
4e902c57 | 1493 | key = ntohl(cfg->fc_dst); |
91b9a277 | 1494 | mask = ntohl(inet_make_mask(plen)); |
19baf839 | 1495 | |
c877efb2 | 1496 | if (key & ~mask) |
19baf839 RO |
1497 | return -EINVAL; |
1498 | ||
1499 | key = key & mask; | |
1500 | l = fib_find_node(t, key); | |
1501 | ||
c877efb2 | 1502 | if (!l) |
19baf839 RO |
1503 | return -ESRCH; |
1504 | ||
ad5b3102 IM |
1505 | li = find_leaf_info(l, plen); |
1506 | ||
1507 | if (!li) | |
1508 | return -ESRCH; | |
1509 | ||
1510 | fa_head = &li->falh; | |
19baf839 RO |
1511 | fa = fib_find_alias(fa_head, tos, 0); |
1512 | ||
1513 | if (!fa) | |
1514 | return -ESRCH; | |
1515 | ||
0c7770c7 | 1516 | pr_debug("Deleting %08x/%d tos=%d t=%p\n", key, plen, tos, t); |
19baf839 RO |
1517 | |
1518 | fa_to_delete = NULL; | |
936f6f8e JA |
1519 | fa = list_entry(fa->fa_list.prev, struct fib_alias, fa_list); |
1520 | list_for_each_entry_continue(fa, fa_head, fa_list) { | |
19baf839 RO |
1521 | struct fib_info *fi = fa->fa_info; |
1522 | ||
1523 | if (fa->fa_tos != tos) | |
1524 | break; | |
1525 | ||
4e902c57 TG |
1526 | if ((!cfg->fc_type || fa->fa_type == cfg->fc_type) && |
1527 | (cfg->fc_scope == RT_SCOPE_NOWHERE || | |
37e826c5 | 1528 | fa->fa_info->fib_scope == cfg->fc_scope) && |
74cb3c10 JA |
1529 | (!cfg->fc_prefsrc || |
1530 | fi->fib_prefsrc == cfg->fc_prefsrc) && | |
4e902c57 TG |
1531 | (!cfg->fc_protocol || |
1532 | fi->fib_protocol == cfg->fc_protocol) && | |
1533 | fib_nh_match(cfg, fi) == 0) { | |
19baf839 RO |
1534 | fa_to_delete = fa; |
1535 | break; | |
1536 | } | |
1537 | } | |
1538 | ||
91b9a277 OJ |
1539 | if (!fa_to_delete) |
1540 | return -ESRCH; | |
19baf839 | 1541 | |
91b9a277 | 1542 | fa = fa_to_delete; |
4e902c57 | 1543 | rtmsg_fib(RTM_DELROUTE, htonl(key), fa, plen, tb->tb_id, |
b8f55831 | 1544 | &cfg->fc_nlinfo, 0); |
91b9a277 | 1545 | |
2373ce1c | 1546 | list_del_rcu(&fa->fa_list); |
19baf839 | 1547 | |
21d8c49e DM |
1548 | if (!plen) |
1549 | tb->tb_num_default--; | |
1550 | ||
91b9a277 | 1551 | if (list_empty(fa_head)) { |
2373ce1c | 1552 | hlist_del_rcu(&li->hlist); |
91b9a277 | 1553 | free_leaf_info(li); |
2373ce1c | 1554 | } |
19baf839 | 1555 | |
91b9a277 | 1556 | if (hlist_empty(&l->list)) |
9195bef7 | 1557 | trie_leaf_remove(t, l); |
19baf839 | 1558 | |
91b9a277 | 1559 | if (fa->fa_state & FA_S_ACCESSED) |
4ccfe6d4 | 1560 | rt_cache_flush(cfg->fc_nlinfo.nl_net); |
19baf839 | 1561 | |
2373ce1c RO |
1562 | fib_release_info(fa->fa_info); |
1563 | alias_free_mem_rcu(fa); | |
91b9a277 | 1564 | return 0; |
19baf839 RO |
1565 | } |
1566 | ||
ef3660ce | 1567 | static int trie_flush_list(struct list_head *head) |
19baf839 RO |
1568 | { |
1569 | struct fib_alias *fa, *fa_node; | |
1570 | int found = 0; | |
1571 | ||
1572 | list_for_each_entry_safe(fa, fa_node, head, fa_list) { | |
1573 | struct fib_info *fi = fa->fa_info; | |
19baf839 | 1574 | |
2373ce1c RO |
1575 | if (fi && (fi->fib_flags & RTNH_F_DEAD)) { |
1576 | list_del_rcu(&fa->fa_list); | |
1577 | fib_release_info(fa->fa_info); | |
1578 | alias_free_mem_rcu(fa); | |
19baf839 RO |
1579 | found++; |
1580 | } | |
1581 | } | |
1582 | return found; | |
1583 | } | |
1584 | ||
adaf9816 | 1585 | static int trie_flush_leaf(struct tnode *l) |
19baf839 RO |
1586 | { |
1587 | int found = 0; | |
1588 | struct hlist_head *lih = &l->list; | |
b67bfe0d | 1589 | struct hlist_node *tmp; |
19baf839 RO |
1590 | struct leaf_info *li = NULL; |
1591 | ||
b67bfe0d | 1592 | hlist_for_each_entry_safe(li, tmp, lih, hlist) { |
ef3660ce | 1593 | found += trie_flush_list(&li->falh); |
19baf839 RO |
1594 | |
1595 | if (list_empty(&li->falh)) { | |
2373ce1c | 1596 | hlist_del_rcu(&li->hlist); |
19baf839 RO |
1597 | free_leaf_info(li); |
1598 | } | |
1599 | } | |
1600 | return found; | |
1601 | } | |
1602 | ||
82cfbb00 SH |
1603 | /* |
1604 | * Scan for the next right leaf starting at node p->child[idx] | |
1605 | * Since we have back pointer, no recursion necessary. | |
1606 | */ | |
adaf9816 | 1607 | static struct tnode *leaf_walk_rcu(struct tnode *p, struct tnode *c) |
19baf839 | 1608 | { |
82cfbb00 SH |
1609 | do { |
1610 | t_key idx; | |
c877efb2 | 1611 | |
c877efb2 | 1612 | if (c) |
82cfbb00 | 1613 | idx = tkey_extract_bits(c->key, p->pos, p->bits) + 1; |
c877efb2 | 1614 | else |
82cfbb00 | 1615 | idx = 0; |
2373ce1c | 1616 | |
82cfbb00 SH |
1617 | while (idx < 1u << p->bits) { |
1618 | c = tnode_get_child_rcu(p, idx++); | |
2373ce1c | 1619 | if (!c) |
91b9a277 OJ |
1620 | continue; |
1621 | ||
aab515d7 | 1622 | if (IS_LEAF(c)) |
adaf9816 | 1623 | return c; |
82cfbb00 SH |
1624 | |
1625 | /* Rescan start scanning in new node */ | |
adaf9816 | 1626 | p = c; |
82cfbb00 | 1627 | idx = 0; |
19baf839 | 1628 | } |
82cfbb00 SH |
1629 | |
1630 | /* Node empty, walk back up to parent */ | |
adaf9816 | 1631 | c = p; |
a034ee3c | 1632 | } while ((p = node_parent_rcu(c)) != NULL); |
82cfbb00 SH |
1633 | |
1634 | return NULL; /* Root of trie */ | |
1635 | } | |
1636 | ||
adaf9816 | 1637 | static struct tnode *trie_firstleaf(struct trie *t) |
82cfbb00 | 1638 | { |
adaf9816 | 1639 | struct tnode *n = rcu_dereference_rtnl(t->trie); |
82cfbb00 SH |
1640 | |
1641 | if (!n) | |
1642 | return NULL; | |
1643 | ||
1644 | if (IS_LEAF(n)) /* trie is just a leaf */ | |
adaf9816 | 1645 | return n; |
82cfbb00 SH |
1646 | |
1647 | return leaf_walk_rcu(n, NULL); | |
1648 | } | |
1649 | ||
adaf9816 | 1650 | static struct tnode *trie_nextleaf(struct tnode *l) |
82cfbb00 | 1651 | { |
adaf9816 | 1652 | struct tnode *p = node_parent_rcu(l); |
82cfbb00 SH |
1653 | |
1654 | if (!p) | |
1655 | return NULL; /* trie with just one leaf */ | |
1656 | ||
adaf9816 | 1657 | return leaf_walk_rcu(p, l); |
19baf839 RO |
1658 | } |
1659 | ||
adaf9816 | 1660 | static struct tnode *trie_leafindex(struct trie *t, int index) |
71d67e66 | 1661 | { |
adaf9816 | 1662 | struct tnode *l = trie_firstleaf(t); |
71d67e66 | 1663 | |
ec28cf73 | 1664 | while (l && index-- > 0) |
71d67e66 | 1665 | l = trie_nextleaf(l); |
ec28cf73 | 1666 | |
71d67e66 SH |
1667 | return l; |
1668 | } | |
1669 | ||
1670 | ||
d562f1f8 RO |
1671 | /* |
1672 | * Caller must hold RTNL. | |
1673 | */ | |
16c6cf8b | 1674 | int fib_table_flush(struct fib_table *tb) |
19baf839 RO |
1675 | { |
1676 | struct trie *t = (struct trie *) tb->tb_data; | |
adaf9816 | 1677 | struct tnode *l, *ll = NULL; |
82cfbb00 | 1678 | int found = 0; |
19baf839 | 1679 | |
82cfbb00 | 1680 | for (l = trie_firstleaf(t); l; l = trie_nextleaf(l)) { |
ef3660ce | 1681 | found += trie_flush_leaf(l); |
19baf839 RO |
1682 | |
1683 | if (ll && hlist_empty(&ll->list)) | |
9195bef7 | 1684 | trie_leaf_remove(t, ll); |
19baf839 RO |
1685 | ll = l; |
1686 | } | |
1687 | ||
1688 | if (ll && hlist_empty(&ll->list)) | |
9195bef7 | 1689 | trie_leaf_remove(t, ll); |
19baf839 | 1690 | |
0c7770c7 | 1691 | pr_debug("trie_flush found=%d\n", found); |
19baf839 RO |
1692 | return found; |
1693 | } | |
1694 | ||
4aa2c466 PE |
1695 | void fib_free_table(struct fib_table *tb) |
1696 | { | |
8274a97a AD |
1697 | #ifdef CONFIG_IP_FIB_TRIE_STATS |
1698 | struct trie *t = (struct trie *)tb->tb_data; | |
1699 | ||
1700 | free_percpu(t->stats); | |
1701 | #endif /* CONFIG_IP_FIB_TRIE_STATS */ | |
4aa2c466 PE |
1702 | kfree(tb); |
1703 | } | |
1704 | ||
a07f5f50 SH |
1705 | static int fn_trie_dump_fa(t_key key, int plen, struct list_head *fah, |
1706 | struct fib_table *tb, | |
19baf839 RO |
1707 | struct sk_buff *skb, struct netlink_callback *cb) |
1708 | { | |
1709 | int i, s_i; | |
1710 | struct fib_alias *fa; | |
32ab5f80 | 1711 | __be32 xkey = htonl(key); |
19baf839 | 1712 | |
71d67e66 | 1713 | s_i = cb->args[5]; |
19baf839 RO |
1714 | i = 0; |
1715 | ||
2373ce1c RO |
1716 | /* rcu_read_lock is hold by caller */ |
1717 | ||
1718 | list_for_each_entry_rcu(fa, fah, fa_list) { | |
19baf839 RO |
1719 | if (i < s_i) { |
1720 | i++; | |
1721 | continue; | |
1722 | } | |
19baf839 | 1723 | |
15e47304 | 1724 | if (fib_dump_info(skb, NETLINK_CB(cb->skb).portid, |
19baf839 RO |
1725 | cb->nlh->nlmsg_seq, |
1726 | RTM_NEWROUTE, | |
1727 | tb->tb_id, | |
1728 | fa->fa_type, | |
be403ea1 | 1729 | xkey, |
19baf839 RO |
1730 | plen, |
1731 | fa->fa_tos, | |
64347f78 | 1732 | fa->fa_info, NLM_F_MULTI) < 0) { |
71d67e66 | 1733 | cb->args[5] = i; |
19baf839 | 1734 | return -1; |
91b9a277 | 1735 | } |
19baf839 RO |
1736 | i++; |
1737 | } | |
71d67e66 | 1738 | cb->args[5] = i; |
19baf839 RO |
1739 | return skb->len; |
1740 | } | |
1741 | ||
adaf9816 | 1742 | static int fn_trie_dump_leaf(struct tnode *l, struct fib_table *tb, |
a88ee229 | 1743 | struct sk_buff *skb, struct netlink_callback *cb) |
19baf839 | 1744 | { |
a88ee229 | 1745 | struct leaf_info *li; |
a88ee229 | 1746 | int i, s_i; |
19baf839 | 1747 | |
71d67e66 | 1748 | s_i = cb->args[4]; |
a88ee229 | 1749 | i = 0; |
19baf839 | 1750 | |
a88ee229 | 1751 | /* rcu_read_lock is hold by caller */ |
b67bfe0d | 1752 | hlist_for_each_entry_rcu(li, &l->list, hlist) { |
a88ee229 SH |
1753 | if (i < s_i) { |
1754 | i++; | |
19baf839 | 1755 | continue; |
a88ee229 | 1756 | } |
91b9a277 | 1757 | |
a88ee229 | 1758 | if (i > s_i) |
71d67e66 | 1759 | cb->args[5] = 0; |
19baf839 | 1760 | |
a88ee229 | 1761 | if (list_empty(&li->falh)) |
19baf839 RO |
1762 | continue; |
1763 | ||
a88ee229 | 1764 | if (fn_trie_dump_fa(l->key, li->plen, &li->falh, tb, skb, cb) < 0) { |
71d67e66 | 1765 | cb->args[4] = i; |
19baf839 RO |
1766 | return -1; |
1767 | } | |
a88ee229 | 1768 | i++; |
19baf839 | 1769 | } |
a88ee229 | 1770 | |
71d67e66 | 1771 | cb->args[4] = i; |
19baf839 RO |
1772 | return skb->len; |
1773 | } | |
1774 | ||
16c6cf8b SH |
1775 | int fib_table_dump(struct fib_table *tb, struct sk_buff *skb, |
1776 | struct netlink_callback *cb) | |
19baf839 | 1777 | { |
adaf9816 | 1778 | struct tnode *l; |
19baf839 | 1779 | struct trie *t = (struct trie *) tb->tb_data; |
d5ce8a0e | 1780 | t_key key = cb->args[2]; |
71d67e66 | 1781 | int count = cb->args[3]; |
19baf839 | 1782 | |
2373ce1c | 1783 | rcu_read_lock(); |
d5ce8a0e SH |
1784 | /* Dump starting at last key. |
1785 | * Note: 0.0.0.0/0 (ie default) is first key. | |
1786 | */ | |
71d67e66 | 1787 | if (count == 0) |
d5ce8a0e SH |
1788 | l = trie_firstleaf(t); |
1789 | else { | |
71d67e66 SH |
1790 | /* Normally, continue from last key, but if that is missing |
1791 | * fallback to using slow rescan | |
1792 | */ | |
d5ce8a0e | 1793 | l = fib_find_node(t, key); |
71d67e66 SH |
1794 | if (!l) |
1795 | l = trie_leafindex(t, count); | |
d5ce8a0e | 1796 | } |
a88ee229 | 1797 | |
d5ce8a0e SH |
1798 | while (l) { |
1799 | cb->args[2] = l->key; | |
a88ee229 | 1800 | if (fn_trie_dump_leaf(l, tb, skb, cb) < 0) { |
71d67e66 | 1801 | cb->args[3] = count; |
a88ee229 | 1802 | rcu_read_unlock(); |
a88ee229 | 1803 | return -1; |
19baf839 | 1804 | } |
d5ce8a0e | 1805 | |
71d67e66 | 1806 | ++count; |
d5ce8a0e | 1807 | l = trie_nextleaf(l); |
71d67e66 SH |
1808 | memset(&cb->args[4], 0, |
1809 | sizeof(cb->args) - 4*sizeof(cb->args[0])); | |
19baf839 | 1810 | } |
71d67e66 | 1811 | cb->args[3] = count; |
2373ce1c | 1812 | rcu_read_unlock(); |
a88ee229 | 1813 | |
19baf839 | 1814 | return skb->len; |
19baf839 RO |
1815 | } |
1816 | ||
5348ba85 | 1817 | void __init fib_trie_init(void) |
7f9b8052 | 1818 | { |
a07f5f50 SH |
1819 | fn_alias_kmem = kmem_cache_create("ip_fib_alias", |
1820 | sizeof(struct fib_alias), | |
bc3c8c1e SH |
1821 | 0, SLAB_PANIC, NULL); |
1822 | ||
1823 | trie_leaf_kmem = kmem_cache_create("ip_fib_trie", | |
adaf9816 | 1824 | max(sizeof(struct tnode), |
bc3c8c1e SH |
1825 | sizeof(struct leaf_info)), |
1826 | 0, SLAB_PANIC, NULL); | |
7f9b8052 | 1827 | } |
19baf839 | 1828 | |
7f9b8052 | 1829 | |
5348ba85 | 1830 | struct fib_table *fib_trie_table(u32 id) |
19baf839 RO |
1831 | { |
1832 | struct fib_table *tb; | |
1833 | struct trie *t; | |
1834 | ||
19baf839 RO |
1835 | tb = kmalloc(sizeof(struct fib_table) + sizeof(struct trie), |
1836 | GFP_KERNEL); | |
1837 | if (tb == NULL) | |
1838 | return NULL; | |
1839 | ||
1840 | tb->tb_id = id; | |
971b893e | 1841 | tb->tb_default = -1; |
21d8c49e | 1842 | tb->tb_num_default = 0; |
19baf839 RO |
1843 | |
1844 | t = (struct trie *) tb->tb_data; | |
8274a97a AD |
1845 | RCU_INIT_POINTER(t->trie, NULL); |
1846 | #ifdef CONFIG_IP_FIB_TRIE_STATS | |
1847 | t->stats = alloc_percpu(struct trie_use_stats); | |
1848 | if (!t->stats) { | |
1849 | kfree(tb); | |
1850 | tb = NULL; | |
1851 | } | |
1852 | #endif | |
19baf839 | 1853 | |
19baf839 RO |
1854 | return tb; |
1855 | } | |
1856 | ||
cb7b593c SH |
1857 | #ifdef CONFIG_PROC_FS |
1858 | /* Depth first Trie walk iterator */ | |
1859 | struct fib_trie_iter { | |
1c340b2f | 1860 | struct seq_net_private p; |
3d3b2d25 | 1861 | struct fib_table *tb; |
cb7b593c | 1862 | struct tnode *tnode; |
a034ee3c ED |
1863 | unsigned int index; |
1864 | unsigned int depth; | |
cb7b593c | 1865 | }; |
19baf839 | 1866 | |
adaf9816 | 1867 | static struct tnode *fib_trie_get_next(struct fib_trie_iter *iter) |
19baf839 | 1868 | { |
cb7b593c | 1869 | struct tnode *tn = iter->tnode; |
a034ee3c | 1870 | unsigned int cindex = iter->index; |
cb7b593c | 1871 | struct tnode *p; |
19baf839 | 1872 | |
6640e697 EB |
1873 | /* A single entry routing table */ |
1874 | if (!tn) | |
1875 | return NULL; | |
1876 | ||
cb7b593c SH |
1877 | pr_debug("get_next iter={node=%p index=%d depth=%d}\n", |
1878 | iter->tnode, iter->index, iter->depth); | |
1879 | rescan: | |
1880 | while (cindex < (1<<tn->bits)) { | |
adaf9816 | 1881 | struct tnode *n = tnode_get_child_rcu(tn, cindex); |
19baf839 | 1882 | |
cb7b593c SH |
1883 | if (n) { |
1884 | if (IS_LEAF(n)) { | |
1885 | iter->tnode = tn; | |
1886 | iter->index = cindex + 1; | |
1887 | } else { | |
1888 | /* push down one level */ | |
adaf9816 | 1889 | iter->tnode = n; |
cb7b593c SH |
1890 | iter->index = 0; |
1891 | ++iter->depth; | |
1892 | } | |
1893 | return n; | |
1894 | } | |
19baf839 | 1895 | |
cb7b593c SH |
1896 | ++cindex; |
1897 | } | |
91b9a277 | 1898 | |
cb7b593c | 1899 | /* Current node exhausted, pop back up */ |
adaf9816 | 1900 | p = node_parent_rcu(tn); |
cb7b593c SH |
1901 | if (p) { |
1902 | cindex = tkey_extract_bits(tn->key, p->pos, p->bits)+1; | |
1903 | tn = p; | |
1904 | --iter->depth; | |
1905 | goto rescan; | |
19baf839 | 1906 | } |
cb7b593c SH |
1907 | |
1908 | /* got root? */ | |
1909 | return NULL; | |
19baf839 RO |
1910 | } |
1911 | ||
adaf9816 | 1912 | static struct tnode *fib_trie_get_first(struct fib_trie_iter *iter, |
cb7b593c | 1913 | struct trie *t) |
19baf839 | 1914 | { |
adaf9816 | 1915 | struct tnode *n; |
5ddf0eb2 | 1916 | |
132adf54 | 1917 | if (!t) |
5ddf0eb2 RO |
1918 | return NULL; |
1919 | ||
1920 | n = rcu_dereference(t->trie); | |
3d3b2d25 | 1921 | if (!n) |
5ddf0eb2 | 1922 | return NULL; |
19baf839 | 1923 | |
3d3b2d25 | 1924 | if (IS_TNODE(n)) { |
adaf9816 | 1925 | iter->tnode = n; |
3d3b2d25 SH |
1926 | iter->index = 0; |
1927 | iter->depth = 1; | |
1928 | } else { | |
1929 | iter->tnode = NULL; | |
1930 | iter->index = 0; | |
1931 | iter->depth = 0; | |
91b9a277 | 1932 | } |
3d3b2d25 SH |
1933 | |
1934 | return n; | |
cb7b593c | 1935 | } |
91b9a277 | 1936 | |
cb7b593c SH |
1937 | static void trie_collect_stats(struct trie *t, struct trie_stat *s) |
1938 | { | |
adaf9816 | 1939 | struct tnode *n; |
cb7b593c | 1940 | struct fib_trie_iter iter; |
91b9a277 | 1941 | |
cb7b593c | 1942 | memset(s, 0, sizeof(*s)); |
91b9a277 | 1943 | |
cb7b593c | 1944 | rcu_read_lock(); |
3d3b2d25 | 1945 | for (n = fib_trie_get_first(&iter, t); n; n = fib_trie_get_next(&iter)) { |
cb7b593c | 1946 | if (IS_LEAF(n)) { |
93672292 | 1947 | struct leaf_info *li; |
93672292 | 1948 | |
cb7b593c SH |
1949 | s->leaves++; |
1950 | s->totdepth += iter.depth; | |
1951 | if (iter.depth > s->maxdepth) | |
1952 | s->maxdepth = iter.depth; | |
93672292 | 1953 | |
adaf9816 | 1954 | hlist_for_each_entry_rcu(li, &n->list, hlist) |
93672292 | 1955 | ++s->prefixes; |
cb7b593c | 1956 | } else { |
cb7b593c SH |
1957 | int i; |
1958 | ||
1959 | s->tnodes++; | |
adaf9816 AD |
1960 | if (n->bits < MAX_STAT_DEPTH) |
1961 | s->nodesizes[n->bits]++; | |
06ef921d | 1962 | |
adaf9816 AD |
1963 | for (i = 0; i < tnode_child_length(n); i++) |
1964 | if (!rcu_access_pointer(n->child[i])) | |
cb7b593c | 1965 | s->nullpointers++; |
19baf839 | 1966 | } |
19baf839 | 1967 | } |
2373ce1c | 1968 | rcu_read_unlock(); |
19baf839 RO |
1969 | } |
1970 | ||
cb7b593c SH |
1971 | /* |
1972 | * This outputs /proc/net/fib_triestats | |
1973 | */ | |
1974 | static void trie_show_stats(struct seq_file *seq, struct trie_stat *stat) | |
19baf839 | 1975 | { |
a034ee3c | 1976 | unsigned int i, max, pointers, bytes, avdepth; |
c877efb2 | 1977 | |
cb7b593c SH |
1978 | if (stat->leaves) |
1979 | avdepth = stat->totdepth*100 / stat->leaves; | |
1980 | else | |
1981 | avdepth = 0; | |
91b9a277 | 1982 | |
a07f5f50 SH |
1983 | seq_printf(seq, "\tAver depth: %u.%02d\n", |
1984 | avdepth / 100, avdepth % 100); | |
cb7b593c | 1985 | seq_printf(seq, "\tMax depth: %u\n", stat->maxdepth); |
91b9a277 | 1986 | |
cb7b593c | 1987 | seq_printf(seq, "\tLeaves: %u\n", stat->leaves); |
adaf9816 | 1988 | bytes = sizeof(struct tnode) * stat->leaves; |
93672292 SH |
1989 | |
1990 | seq_printf(seq, "\tPrefixes: %u\n", stat->prefixes); | |
1991 | bytes += sizeof(struct leaf_info) * stat->prefixes; | |
1992 | ||
187b5188 | 1993 | seq_printf(seq, "\tInternal nodes: %u\n\t", stat->tnodes); |
cb7b593c | 1994 | bytes += sizeof(struct tnode) * stat->tnodes; |
19baf839 | 1995 | |
06ef921d RO |
1996 | max = MAX_STAT_DEPTH; |
1997 | while (max > 0 && stat->nodesizes[max-1] == 0) | |
cb7b593c | 1998 | max--; |
19baf839 | 1999 | |
cb7b593c | 2000 | pointers = 0; |
f585a991 | 2001 | for (i = 1; i < max; i++) |
cb7b593c | 2002 | if (stat->nodesizes[i] != 0) { |
187b5188 | 2003 | seq_printf(seq, " %u: %u", i, stat->nodesizes[i]); |
cb7b593c SH |
2004 | pointers += (1<<i) * stat->nodesizes[i]; |
2005 | } | |
2006 | seq_putc(seq, '\n'); | |
187b5188 | 2007 | seq_printf(seq, "\tPointers: %u\n", pointers); |
2373ce1c | 2008 | |
adaf9816 | 2009 | bytes += sizeof(struct tnode *) * pointers; |
187b5188 SH |
2010 | seq_printf(seq, "Null ptrs: %u\n", stat->nullpointers); |
2011 | seq_printf(seq, "Total size: %u kB\n", (bytes + 1023) / 1024); | |
66a2f7fd | 2012 | } |
2373ce1c | 2013 | |
cb7b593c | 2014 | #ifdef CONFIG_IP_FIB_TRIE_STATS |
66a2f7fd | 2015 | static void trie_show_usage(struct seq_file *seq, |
8274a97a | 2016 | const struct trie_use_stats __percpu *stats) |
66a2f7fd | 2017 | { |
8274a97a AD |
2018 | struct trie_use_stats s = { 0 }; |
2019 | int cpu; | |
2020 | ||
2021 | /* loop through all of the CPUs and gather up the stats */ | |
2022 | for_each_possible_cpu(cpu) { | |
2023 | const struct trie_use_stats *pcpu = per_cpu_ptr(stats, cpu); | |
2024 | ||
2025 | s.gets += pcpu->gets; | |
2026 | s.backtrack += pcpu->backtrack; | |
2027 | s.semantic_match_passed += pcpu->semantic_match_passed; | |
2028 | s.semantic_match_miss += pcpu->semantic_match_miss; | |
2029 | s.null_node_hit += pcpu->null_node_hit; | |
2030 | s.resize_node_skipped += pcpu->resize_node_skipped; | |
2031 | } | |
2032 | ||
66a2f7fd | 2033 | seq_printf(seq, "\nCounters:\n---------\n"); |
8274a97a AD |
2034 | seq_printf(seq, "gets = %u\n", s.gets); |
2035 | seq_printf(seq, "backtracks = %u\n", s.backtrack); | |
a07f5f50 | 2036 | seq_printf(seq, "semantic match passed = %u\n", |
8274a97a AD |
2037 | s.semantic_match_passed); |
2038 | seq_printf(seq, "semantic match miss = %u\n", s.semantic_match_miss); | |
2039 | seq_printf(seq, "null node hit= %u\n", s.null_node_hit); | |
2040 | seq_printf(seq, "skipped node resize = %u\n\n", s.resize_node_skipped); | |
cb7b593c | 2041 | } |
66a2f7fd SH |
2042 | #endif /* CONFIG_IP_FIB_TRIE_STATS */ |
2043 | ||
3d3b2d25 | 2044 | static void fib_table_print(struct seq_file *seq, struct fib_table *tb) |
d717a9a6 | 2045 | { |
3d3b2d25 SH |
2046 | if (tb->tb_id == RT_TABLE_LOCAL) |
2047 | seq_puts(seq, "Local:\n"); | |
2048 | else if (tb->tb_id == RT_TABLE_MAIN) | |
2049 | seq_puts(seq, "Main:\n"); | |
2050 | else | |
2051 | seq_printf(seq, "Id %d:\n", tb->tb_id); | |
d717a9a6 | 2052 | } |
19baf839 | 2053 | |
3d3b2d25 | 2054 | |
cb7b593c SH |
2055 | static int fib_triestat_seq_show(struct seq_file *seq, void *v) |
2056 | { | |
1c340b2f | 2057 | struct net *net = (struct net *)seq->private; |
3d3b2d25 | 2058 | unsigned int h; |
877a9bff | 2059 | |
d717a9a6 | 2060 | seq_printf(seq, |
a07f5f50 SH |
2061 | "Basic info: size of leaf:" |
2062 | " %Zd bytes, size of tnode: %Zd bytes.\n", | |
adaf9816 | 2063 | sizeof(struct tnode), sizeof(struct tnode)); |
d717a9a6 | 2064 | |
3d3b2d25 SH |
2065 | for (h = 0; h < FIB_TABLE_HASHSZ; h++) { |
2066 | struct hlist_head *head = &net->ipv4.fib_table_hash[h]; | |
3d3b2d25 SH |
2067 | struct fib_table *tb; |
2068 | ||
b67bfe0d | 2069 | hlist_for_each_entry_rcu(tb, head, tb_hlist) { |
3d3b2d25 SH |
2070 | struct trie *t = (struct trie *) tb->tb_data; |
2071 | struct trie_stat stat; | |
877a9bff | 2072 | |
3d3b2d25 SH |
2073 | if (!t) |
2074 | continue; | |
2075 | ||
2076 | fib_table_print(seq, tb); | |
2077 | ||
2078 | trie_collect_stats(t, &stat); | |
2079 | trie_show_stats(seq, &stat); | |
2080 | #ifdef CONFIG_IP_FIB_TRIE_STATS | |
8274a97a | 2081 | trie_show_usage(seq, t->stats); |
3d3b2d25 SH |
2082 | #endif |
2083 | } | |
2084 | } | |
19baf839 | 2085 | |
cb7b593c | 2086 | return 0; |
19baf839 RO |
2087 | } |
2088 | ||
cb7b593c | 2089 | static int fib_triestat_seq_open(struct inode *inode, struct file *file) |
19baf839 | 2090 | { |
de05c557 | 2091 | return single_open_net(inode, file, fib_triestat_seq_show); |
1c340b2f DL |
2092 | } |
2093 | ||
9a32144e | 2094 | static const struct file_operations fib_triestat_fops = { |
cb7b593c SH |
2095 | .owner = THIS_MODULE, |
2096 | .open = fib_triestat_seq_open, | |
2097 | .read = seq_read, | |
2098 | .llseek = seq_lseek, | |
b6fcbdb4 | 2099 | .release = single_release_net, |
cb7b593c SH |
2100 | }; |
2101 | ||
adaf9816 | 2102 | static struct tnode *fib_trie_get_idx(struct seq_file *seq, loff_t pos) |
19baf839 | 2103 | { |
1218854a YH |
2104 | struct fib_trie_iter *iter = seq->private; |
2105 | struct net *net = seq_file_net(seq); | |
cb7b593c | 2106 | loff_t idx = 0; |
3d3b2d25 | 2107 | unsigned int h; |
cb7b593c | 2108 | |
3d3b2d25 SH |
2109 | for (h = 0; h < FIB_TABLE_HASHSZ; h++) { |
2110 | struct hlist_head *head = &net->ipv4.fib_table_hash[h]; | |
3d3b2d25 | 2111 | struct fib_table *tb; |
cb7b593c | 2112 | |
b67bfe0d | 2113 | hlist_for_each_entry_rcu(tb, head, tb_hlist) { |
adaf9816 | 2114 | struct tnode *n; |
3d3b2d25 SH |
2115 | |
2116 | for (n = fib_trie_get_first(iter, | |
2117 | (struct trie *) tb->tb_data); | |
2118 | n; n = fib_trie_get_next(iter)) | |
2119 | if (pos == idx++) { | |
2120 | iter->tb = tb; | |
2121 | return n; | |
2122 | } | |
2123 | } | |
cb7b593c | 2124 | } |
3d3b2d25 | 2125 | |
19baf839 RO |
2126 | return NULL; |
2127 | } | |
2128 | ||
cb7b593c | 2129 | static void *fib_trie_seq_start(struct seq_file *seq, loff_t *pos) |
c95aaf9a | 2130 | __acquires(RCU) |
19baf839 | 2131 | { |
cb7b593c | 2132 | rcu_read_lock(); |
1218854a | 2133 | return fib_trie_get_idx(seq, *pos); |
19baf839 RO |
2134 | } |
2135 | ||
cb7b593c | 2136 | static void *fib_trie_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
19baf839 | 2137 | { |
cb7b593c | 2138 | struct fib_trie_iter *iter = seq->private; |
1218854a | 2139 | struct net *net = seq_file_net(seq); |
3d3b2d25 SH |
2140 | struct fib_table *tb = iter->tb; |
2141 | struct hlist_node *tb_node; | |
2142 | unsigned int h; | |
adaf9816 | 2143 | struct tnode *n; |
cb7b593c | 2144 | |
19baf839 | 2145 | ++*pos; |
3d3b2d25 SH |
2146 | /* next node in same table */ |
2147 | n = fib_trie_get_next(iter); | |
2148 | if (n) | |
2149 | return n; | |
19baf839 | 2150 | |
3d3b2d25 SH |
2151 | /* walk rest of this hash chain */ |
2152 | h = tb->tb_id & (FIB_TABLE_HASHSZ - 1); | |
0a5c0475 | 2153 | while ((tb_node = rcu_dereference(hlist_next_rcu(&tb->tb_hlist)))) { |
3d3b2d25 SH |
2154 | tb = hlist_entry(tb_node, struct fib_table, tb_hlist); |
2155 | n = fib_trie_get_first(iter, (struct trie *) tb->tb_data); | |
2156 | if (n) | |
2157 | goto found; | |
2158 | } | |
19baf839 | 2159 | |
3d3b2d25 SH |
2160 | /* new hash chain */ |
2161 | while (++h < FIB_TABLE_HASHSZ) { | |
2162 | struct hlist_head *head = &net->ipv4.fib_table_hash[h]; | |
b67bfe0d | 2163 | hlist_for_each_entry_rcu(tb, head, tb_hlist) { |
3d3b2d25 SH |
2164 | n = fib_trie_get_first(iter, (struct trie *) tb->tb_data); |
2165 | if (n) | |
2166 | goto found; | |
2167 | } | |
2168 | } | |
cb7b593c | 2169 | return NULL; |
3d3b2d25 SH |
2170 | |
2171 | found: | |
2172 | iter->tb = tb; | |
2173 | return n; | |
cb7b593c | 2174 | } |
19baf839 | 2175 | |
cb7b593c | 2176 | static void fib_trie_seq_stop(struct seq_file *seq, void *v) |
c95aaf9a | 2177 | __releases(RCU) |
19baf839 | 2178 | { |
cb7b593c SH |
2179 | rcu_read_unlock(); |
2180 | } | |
91b9a277 | 2181 | |
cb7b593c SH |
2182 | static void seq_indent(struct seq_file *seq, int n) |
2183 | { | |
a034ee3c ED |
2184 | while (n-- > 0) |
2185 | seq_puts(seq, " "); | |
cb7b593c | 2186 | } |
19baf839 | 2187 | |
28d36e37 | 2188 | static inline const char *rtn_scope(char *buf, size_t len, enum rt_scope_t s) |
cb7b593c | 2189 | { |
132adf54 | 2190 | switch (s) { |
cb7b593c SH |
2191 | case RT_SCOPE_UNIVERSE: return "universe"; |
2192 | case RT_SCOPE_SITE: return "site"; | |
2193 | case RT_SCOPE_LINK: return "link"; | |
2194 | case RT_SCOPE_HOST: return "host"; | |
2195 | case RT_SCOPE_NOWHERE: return "nowhere"; | |
2196 | default: | |
28d36e37 | 2197 | snprintf(buf, len, "scope=%d", s); |
cb7b593c SH |
2198 | return buf; |
2199 | } | |
2200 | } | |
19baf839 | 2201 | |
36cbd3dc | 2202 | static const char *const rtn_type_names[__RTN_MAX] = { |
cb7b593c SH |
2203 | [RTN_UNSPEC] = "UNSPEC", |
2204 | [RTN_UNICAST] = "UNICAST", | |
2205 | [RTN_LOCAL] = "LOCAL", | |
2206 | [RTN_BROADCAST] = "BROADCAST", | |
2207 | [RTN_ANYCAST] = "ANYCAST", | |
2208 | [RTN_MULTICAST] = "MULTICAST", | |
2209 | [RTN_BLACKHOLE] = "BLACKHOLE", | |
2210 | [RTN_UNREACHABLE] = "UNREACHABLE", | |
2211 | [RTN_PROHIBIT] = "PROHIBIT", | |
2212 | [RTN_THROW] = "THROW", | |
2213 | [RTN_NAT] = "NAT", | |
2214 | [RTN_XRESOLVE] = "XRESOLVE", | |
2215 | }; | |
19baf839 | 2216 | |
a034ee3c | 2217 | static inline const char *rtn_type(char *buf, size_t len, unsigned int t) |
cb7b593c | 2218 | { |
cb7b593c SH |
2219 | if (t < __RTN_MAX && rtn_type_names[t]) |
2220 | return rtn_type_names[t]; | |
28d36e37 | 2221 | snprintf(buf, len, "type %u", t); |
cb7b593c | 2222 | return buf; |
19baf839 RO |
2223 | } |
2224 | ||
cb7b593c SH |
2225 | /* Pretty print the trie */ |
2226 | static int fib_trie_seq_show(struct seq_file *seq, void *v) | |
19baf839 | 2227 | { |
cb7b593c | 2228 | const struct fib_trie_iter *iter = seq->private; |
adaf9816 | 2229 | struct tnode *n = v; |
c877efb2 | 2230 | |
3d3b2d25 SH |
2231 | if (!node_parent_rcu(n)) |
2232 | fib_table_print(seq, iter->tb); | |
095b8501 | 2233 | |
cb7b593c | 2234 | if (IS_TNODE(n)) { |
adaf9816 | 2235 | __be32 prf = htonl(n->key); |
91b9a277 | 2236 | |
adaf9816 | 2237 | seq_indent(seq, iter->depth - 1); |
673d57e7 | 2238 | seq_printf(seq, " +-- %pI4/%d %d %d %d\n", |
adaf9816 AD |
2239 | &prf, n->pos, n->bits, n->full_children, |
2240 | n->empty_children); | |
cb7b593c | 2241 | } else { |
1328042e | 2242 | struct leaf_info *li; |
adaf9816 | 2243 | __be32 val = htonl(n->key); |
cb7b593c SH |
2244 | |
2245 | seq_indent(seq, iter->depth); | |
673d57e7 | 2246 | seq_printf(seq, " |-- %pI4\n", &val); |
1328042e | 2247 | |
adaf9816 | 2248 | hlist_for_each_entry_rcu(li, &n->list, hlist) { |
1328042e SH |
2249 | struct fib_alias *fa; |
2250 | ||
2251 | list_for_each_entry_rcu(fa, &li->falh, fa_list) { | |
2252 | char buf1[32], buf2[32]; | |
2253 | ||
2254 | seq_indent(seq, iter->depth+1); | |
2255 | seq_printf(seq, " /%d %s %s", li->plen, | |
2256 | rtn_scope(buf1, sizeof(buf1), | |
37e826c5 | 2257 | fa->fa_info->fib_scope), |
1328042e SH |
2258 | rtn_type(buf2, sizeof(buf2), |
2259 | fa->fa_type)); | |
2260 | if (fa->fa_tos) | |
b9c4d82a | 2261 | seq_printf(seq, " tos=%d", fa->fa_tos); |
1328042e | 2262 | seq_putc(seq, '\n'); |
cb7b593c SH |
2263 | } |
2264 | } | |
19baf839 | 2265 | } |
cb7b593c | 2266 | |
19baf839 RO |
2267 | return 0; |
2268 | } | |
2269 | ||
f690808e | 2270 | static const struct seq_operations fib_trie_seq_ops = { |
cb7b593c SH |
2271 | .start = fib_trie_seq_start, |
2272 | .next = fib_trie_seq_next, | |
2273 | .stop = fib_trie_seq_stop, | |
2274 | .show = fib_trie_seq_show, | |
19baf839 RO |
2275 | }; |
2276 | ||
cb7b593c | 2277 | static int fib_trie_seq_open(struct inode *inode, struct file *file) |
19baf839 | 2278 | { |
1c340b2f DL |
2279 | return seq_open_net(inode, file, &fib_trie_seq_ops, |
2280 | sizeof(struct fib_trie_iter)); | |
19baf839 RO |
2281 | } |
2282 | ||
9a32144e | 2283 | static const struct file_operations fib_trie_fops = { |
cb7b593c SH |
2284 | .owner = THIS_MODULE, |
2285 | .open = fib_trie_seq_open, | |
2286 | .read = seq_read, | |
2287 | .llseek = seq_lseek, | |
1c340b2f | 2288 | .release = seq_release_net, |
19baf839 RO |
2289 | }; |
2290 | ||
8315f5d8 SH |
2291 | struct fib_route_iter { |
2292 | struct seq_net_private p; | |
2293 | struct trie *main_trie; | |
2294 | loff_t pos; | |
2295 | t_key key; | |
2296 | }; | |
2297 | ||
adaf9816 | 2298 | static struct tnode *fib_route_get_idx(struct fib_route_iter *iter, loff_t pos) |
8315f5d8 | 2299 | { |
adaf9816 | 2300 | struct tnode *l = NULL; |
8315f5d8 SH |
2301 | struct trie *t = iter->main_trie; |
2302 | ||
2303 | /* use cache location of last found key */ | |
2304 | if (iter->pos > 0 && pos >= iter->pos && (l = fib_find_node(t, iter->key))) | |
2305 | pos -= iter->pos; | |
2306 | else { | |
2307 | iter->pos = 0; | |
2308 | l = trie_firstleaf(t); | |
2309 | } | |
2310 | ||
2311 | while (l && pos-- > 0) { | |
2312 | iter->pos++; | |
2313 | l = trie_nextleaf(l); | |
2314 | } | |
2315 | ||
2316 | if (l) | |
2317 | iter->key = pos; /* remember it */ | |
2318 | else | |
2319 | iter->pos = 0; /* forget it */ | |
2320 | ||
2321 | return l; | |
2322 | } | |
2323 | ||
2324 | static void *fib_route_seq_start(struct seq_file *seq, loff_t *pos) | |
2325 | __acquires(RCU) | |
2326 | { | |
2327 | struct fib_route_iter *iter = seq->private; | |
2328 | struct fib_table *tb; | |
2329 | ||
2330 | rcu_read_lock(); | |
1218854a | 2331 | tb = fib_get_table(seq_file_net(seq), RT_TABLE_MAIN); |
8315f5d8 SH |
2332 | if (!tb) |
2333 | return NULL; | |
2334 | ||
2335 | iter->main_trie = (struct trie *) tb->tb_data; | |
2336 | if (*pos == 0) | |
2337 | return SEQ_START_TOKEN; | |
2338 | else | |
2339 | return fib_route_get_idx(iter, *pos - 1); | |
2340 | } | |
2341 | ||
2342 | static void *fib_route_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2343 | { | |
2344 | struct fib_route_iter *iter = seq->private; | |
adaf9816 | 2345 | struct tnode *l = v; |
8315f5d8 SH |
2346 | |
2347 | ++*pos; | |
2348 | if (v == SEQ_START_TOKEN) { | |
2349 | iter->pos = 0; | |
2350 | l = trie_firstleaf(iter->main_trie); | |
2351 | } else { | |
2352 | iter->pos++; | |
2353 | l = trie_nextleaf(l); | |
2354 | } | |
2355 | ||
2356 | if (l) | |
2357 | iter->key = l->key; | |
2358 | else | |
2359 | iter->pos = 0; | |
2360 | return l; | |
2361 | } | |
2362 | ||
2363 | static void fib_route_seq_stop(struct seq_file *seq, void *v) | |
2364 | __releases(RCU) | |
2365 | { | |
2366 | rcu_read_unlock(); | |
2367 | } | |
2368 | ||
a034ee3c | 2369 | static unsigned int fib_flag_trans(int type, __be32 mask, const struct fib_info *fi) |
19baf839 | 2370 | { |
a034ee3c | 2371 | unsigned int flags = 0; |
19baf839 | 2372 | |
a034ee3c ED |
2373 | if (type == RTN_UNREACHABLE || type == RTN_PROHIBIT) |
2374 | flags = RTF_REJECT; | |
cb7b593c SH |
2375 | if (fi && fi->fib_nh->nh_gw) |
2376 | flags |= RTF_GATEWAY; | |
32ab5f80 | 2377 | if (mask == htonl(0xFFFFFFFF)) |
cb7b593c SH |
2378 | flags |= RTF_HOST; |
2379 | flags |= RTF_UP; | |
2380 | return flags; | |
19baf839 RO |
2381 | } |
2382 | ||
cb7b593c SH |
2383 | /* |
2384 | * This outputs /proc/net/route. | |
2385 | * The format of the file is not supposed to be changed | |
a034ee3c | 2386 | * and needs to be same as fib_hash output to avoid breaking |
cb7b593c SH |
2387 | * legacy utilities |
2388 | */ | |
2389 | static int fib_route_seq_show(struct seq_file *seq, void *v) | |
19baf839 | 2390 | { |
adaf9816 | 2391 | struct tnode *l = v; |
1328042e | 2392 | struct leaf_info *li; |
19baf839 | 2393 | |
cb7b593c SH |
2394 | if (v == SEQ_START_TOKEN) { |
2395 | seq_printf(seq, "%-127s\n", "Iface\tDestination\tGateway " | |
2396 | "\tFlags\tRefCnt\tUse\tMetric\tMask\t\tMTU" | |
2397 | "\tWindow\tIRTT"); | |
2398 | return 0; | |
2399 | } | |
19baf839 | 2400 | |
b67bfe0d | 2401 | hlist_for_each_entry_rcu(li, &l->list, hlist) { |
cb7b593c | 2402 | struct fib_alias *fa; |
32ab5f80 | 2403 | __be32 mask, prefix; |
91b9a277 | 2404 | |
cb7b593c SH |
2405 | mask = inet_make_mask(li->plen); |
2406 | prefix = htonl(l->key); | |
19baf839 | 2407 | |
cb7b593c | 2408 | list_for_each_entry_rcu(fa, &li->falh, fa_list) { |
1371e37d | 2409 | const struct fib_info *fi = fa->fa_info; |
a034ee3c | 2410 | unsigned int flags = fib_flag_trans(fa->fa_type, mask, fi); |
19baf839 | 2411 | |
cb7b593c SH |
2412 | if (fa->fa_type == RTN_BROADCAST |
2413 | || fa->fa_type == RTN_MULTICAST) | |
2414 | continue; | |
19baf839 | 2415 | |
652586df TH |
2416 | seq_setwidth(seq, 127); |
2417 | ||
cb7b593c | 2418 | if (fi) |
5e659e4c PE |
2419 | seq_printf(seq, |
2420 | "%s\t%08X\t%08X\t%04X\t%d\t%u\t" | |
652586df | 2421 | "%d\t%08X\t%d\t%u\t%u", |
cb7b593c SH |
2422 | fi->fib_dev ? fi->fib_dev->name : "*", |
2423 | prefix, | |
2424 | fi->fib_nh->nh_gw, flags, 0, 0, | |
2425 | fi->fib_priority, | |
2426 | mask, | |
a07f5f50 SH |
2427 | (fi->fib_advmss ? |
2428 | fi->fib_advmss + 40 : 0), | |
cb7b593c | 2429 | fi->fib_window, |
652586df | 2430 | fi->fib_rtt >> 3); |
cb7b593c | 2431 | else |
5e659e4c PE |
2432 | seq_printf(seq, |
2433 | "*\t%08X\t%08X\t%04X\t%d\t%u\t" | |
652586df | 2434 | "%d\t%08X\t%d\t%u\t%u", |
cb7b593c | 2435 | prefix, 0, flags, 0, 0, 0, |
652586df | 2436 | mask, 0, 0, 0); |
19baf839 | 2437 | |
652586df | 2438 | seq_pad(seq, '\n'); |
cb7b593c | 2439 | } |
19baf839 RO |
2440 | } |
2441 | ||
2442 | return 0; | |
2443 | } | |
2444 | ||
f690808e | 2445 | static const struct seq_operations fib_route_seq_ops = { |
8315f5d8 SH |
2446 | .start = fib_route_seq_start, |
2447 | .next = fib_route_seq_next, | |
2448 | .stop = fib_route_seq_stop, | |
cb7b593c | 2449 | .show = fib_route_seq_show, |
19baf839 RO |
2450 | }; |
2451 | ||
cb7b593c | 2452 | static int fib_route_seq_open(struct inode *inode, struct file *file) |
19baf839 | 2453 | { |
1c340b2f | 2454 | return seq_open_net(inode, file, &fib_route_seq_ops, |
8315f5d8 | 2455 | sizeof(struct fib_route_iter)); |
19baf839 RO |
2456 | } |
2457 | ||
9a32144e | 2458 | static const struct file_operations fib_route_fops = { |
cb7b593c SH |
2459 | .owner = THIS_MODULE, |
2460 | .open = fib_route_seq_open, | |
2461 | .read = seq_read, | |
2462 | .llseek = seq_lseek, | |
1c340b2f | 2463 | .release = seq_release_net, |
19baf839 RO |
2464 | }; |
2465 | ||
61a02653 | 2466 | int __net_init fib_proc_init(struct net *net) |
19baf839 | 2467 | { |
d4beaa66 | 2468 | if (!proc_create("fib_trie", S_IRUGO, net->proc_net, &fib_trie_fops)) |
cb7b593c SH |
2469 | goto out1; |
2470 | ||
d4beaa66 G |
2471 | if (!proc_create("fib_triestat", S_IRUGO, net->proc_net, |
2472 | &fib_triestat_fops)) | |
cb7b593c SH |
2473 | goto out2; |
2474 | ||
d4beaa66 | 2475 | if (!proc_create("route", S_IRUGO, net->proc_net, &fib_route_fops)) |
cb7b593c SH |
2476 | goto out3; |
2477 | ||
19baf839 | 2478 | return 0; |
cb7b593c SH |
2479 | |
2480 | out3: | |
ece31ffd | 2481 | remove_proc_entry("fib_triestat", net->proc_net); |
cb7b593c | 2482 | out2: |
ece31ffd | 2483 | remove_proc_entry("fib_trie", net->proc_net); |
cb7b593c SH |
2484 | out1: |
2485 | return -ENOMEM; | |
19baf839 RO |
2486 | } |
2487 | ||
61a02653 | 2488 | void __net_exit fib_proc_exit(struct net *net) |
19baf839 | 2489 | { |
ece31ffd G |
2490 | remove_proc_entry("fib_trie", net->proc_net); |
2491 | remove_proc_entry("fib_triestat", net->proc_net); | |
2492 | remove_proc_entry("route", net->proc_net); | |
19baf839 RO |
2493 | } |
2494 | ||
2495 | #endif /* CONFIG_PROC_FS */ |