| 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 | * |
| 10 | * Jens Laas <jens.laas@data.slu.se> Swedish University of |
| 11 | * Agricultural Sciences. |
| 12 | * |
| 13 | * Hans Liss <hans.liss@its.uu.se> Uppsala Universitet |
| 14 | * |
| 15 | * This work is based on the LPC-trie which is originally descibed in: |
| 16 | * |
| 17 | * An experimental study of compression methods for dynamic tries |
| 18 | * Stefan Nilsson and Matti Tikkanen. Algorithmica, 33(1):19-33, 2002. |
| 19 | * http://www.nada.kth.se/~snilsson/public/papers/dyntrie2/ |
| 20 | * |
| 21 | * |
| 22 | * IP-address lookup using LC-tries. Stefan Nilsson and Gunnar Karlsson |
| 23 | * IEEE Journal on Selected Areas in Communications, 17(6):1083-1092, June 1999 |
| 24 | * |
| 25 | * Version: $Id: fib_trie.c,v 1.3 2005/06/08 14:20:01 robert Exp $ |
| 26 | * |
| 27 | * |
| 28 | * Code from fib_hash has been reused which includes the following header: |
| 29 | * |
| 30 | * |
| 31 | * INET An implementation of the TCP/IP protocol suite for the LINUX |
| 32 | * operating system. INET is implemented using the BSD Socket |
| 33 | * interface as the means of communication with the user level. |
| 34 | * |
| 35 | * IPv4 FIB: lookup engine and maintenance routines. |
| 36 | * |
| 37 | * |
| 38 | * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> |
| 39 | * |
| 40 | * This program is free software; you can redistribute it and/or |
| 41 | * modify it under the terms of the GNU General Public License |
| 42 | * as published by the Free Software Foundation; either version |
| 43 | * 2 of the License, or (at your option) any later version. |
| 44 | */ |
| 45 | |
| 46 | #define VERSION "0.325" |
| 47 | |
| 48 | #include <linux/config.h> |
| 49 | #include <asm/uaccess.h> |
| 50 | #include <asm/system.h> |
| 51 | #include <asm/bitops.h> |
| 52 | #include <linux/types.h> |
| 53 | #include <linux/kernel.h> |
| 54 | #include <linux/sched.h> |
| 55 | #include <linux/mm.h> |
| 56 | #include <linux/string.h> |
| 57 | #include <linux/socket.h> |
| 58 | #include <linux/sockios.h> |
| 59 | #include <linux/errno.h> |
| 60 | #include <linux/in.h> |
| 61 | #include <linux/inet.h> |
| 62 | #include <linux/netdevice.h> |
| 63 | #include <linux/if_arp.h> |
| 64 | #include <linux/proc_fs.h> |
| 65 | #include <linux/skbuff.h> |
| 66 | #include <linux/netlink.h> |
| 67 | #include <linux/init.h> |
| 68 | #include <linux/list.h> |
| 69 | #include <net/ip.h> |
| 70 | #include <net/protocol.h> |
| 71 | #include <net/route.h> |
| 72 | #include <net/tcp.h> |
| 73 | #include <net/sock.h> |
| 74 | #include <net/ip_fib.h> |
| 75 | #include "fib_lookup.h" |
| 76 | |
| 77 | #undef CONFIG_IP_FIB_TRIE_STATS |
| 78 | #define MAX_CHILDS 16384 |
| 79 | |
| 80 | #define EXTRACT(p, n, str) ((str)<<(p)>>(32-(n))) |
| 81 | #define KEYLENGTH (8*sizeof(t_key)) |
| 82 | #define MASK_PFX(k, l) (((l)==0)?0:(k >> (KEYLENGTH-l)) << (KEYLENGTH-l)) |
| 83 | #define TKEY_GET_MASK(offset, bits) (((bits)==0)?0:((t_key)(-1) << (KEYLENGTH - bits) >> offset)) |
| 84 | |
| 85 | static DEFINE_RWLOCK(fib_lock); |
| 86 | |
| 87 | typedef unsigned int t_key; |
| 88 | |
| 89 | #define T_TNODE 0 |
| 90 | #define T_LEAF 1 |
| 91 | #define NODE_TYPE_MASK 0x1UL |
| 92 | #define NODE_PARENT(_node) \ |
| 93 | ((struct tnode *)((_node)->_parent & ~NODE_TYPE_MASK)) |
| 94 | #define NODE_SET_PARENT(_node, _ptr) \ |
| 95 | ((_node)->_parent = (((unsigned long)(_ptr)) | \ |
| 96 | ((_node)->_parent & NODE_TYPE_MASK))) |
| 97 | #define NODE_INIT_PARENT(_node, _type) \ |
| 98 | ((_node)->_parent = (_type)) |
| 99 | #define NODE_TYPE(_node) \ |
| 100 | ((_node)->_parent & NODE_TYPE_MASK) |
| 101 | |
| 102 | #define IS_TNODE(n) (!(n->_parent & T_LEAF)) |
| 103 | #define IS_LEAF(n) (n->_parent & T_LEAF) |
| 104 | |
| 105 | struct node { |
| 106 | t_key key; |
| 107 | unsigned long _parent; |
| 108 | }; |
| 109 | |
| 110 | struct leaf { |
| 111 | t_key key; |
| 112 | unsigned long _parent; |
| 113 | struct hlist_head list; |
| 114 | }; |
| 115 | |
| 116 | struct leaf_info { |
| 117 | struct hlist_node hlist; |
| 118 | int plen; |
| 119 | struct list_head falh; |
| 120 | }; |
| 121 | |
| 122 | struct tnode { |
| 123 | t_key key; |
| 124 | unsigned long _parent; |
| 125 | unsigned short pos:5; /* 2log(KEYLENGTH) bits needed */ |
| 126 | unsigned short bits:5; /* 2log(KEYLENGTH) bits needed */ |
| 127 | unsigned short full_children; /* KEYLENGTH bits needed */ |
| 128 | unsigned short empty_children; /* KEYLENGTH bits needed */ |
| 129 | struct node *child[0]; |
| 130 | }; |
| 131 | |
| 132 | #ifdef CONFIG_IP_FIB_TRIE_STATS |
| 133 | struct trie_use_stats { |
| 134 | unsigned int gets; |
| 135 | unsigned int backtrack; |
| 136 | unsigned int semantic_match_passed; |
| 137 | unsigned int semantic_match_miss; |
| 138 | unsigned int null_node_hit; |
| 139 | unsigned int resize_node_skipped; |
| 140 | }; |
| 141 | #endif |
| 142 | |
| 143 | struct trie_stat { |
| 144 | unsigned int totdepth; |
| 145 | unsigned int maxdepth; |
| 146 | unsigned int tnodes; |
| 147 | unsigned int leaves; |
| 148 | unsigned int nullpointers; |
| 149 | unsigned int nodesizes[MAX_CHILDS]; |
| 150 | }; |
| 151 | |
| 152 | struct trie { |
| 153 | struct node *trie; |
| 154 | #ifdef CONFIG_IP_FIB_TRIE_STATS |
| 155 | struct trie_use_stats stats; |
| 156 | #endif |
| 157 | int size; |
| 158 | unsigned int revision; |
| 159 | }; |
| 160 | |
| 161 | static int trie_debug = 0; |
| 162 | |
| 163 | static int tnode_full(struct tnode *tn, struct node *n); |
| 164 | static void put_child(struct trie *t, struct tnode *tn, int i, struct node *n); |
| 165 | static void tnode_put_child_reorg(struct tnode *tn, int i, struct node *n, int wasfull); |
| 166 | static int tnode_child_length(struct tnode *tn); |
| 167 | static struct node *resize(struct trie *t, struct tnode *tn); |
| 168 | static struct tnode *inflate(struct trie *t, struct tnode *tn, int *err); |
| 169 | static struct tnode *halve(struct trie *t, struct tnode *tn, int *err); |
| 170 | static void tnode_free(struct tnode *tn); |
| 171 | static void trie_dump_seq(struct seq_file *seq, struct trie *t); |
| 172 | extern struct fib_alias *fib_find_alias(struct list_head *fah, u8 tos, u32 prio); |
| 173 | extern int fib_detect_death(struct fib_info *fi, int order, |
| 174 | struct fib_info **last_resort, int *last_idx, int *dflt); |
| 175 | |
| 176 | extern void rtmsg_fib(int event, u32 key, struct fib_alias *fa, int z, int tb_id, |
| 177 | struct nlmsghdr *n, struct netlink_skb_parms *req); |
| 178 | |
| 179 | static kmem_cache_t *fn_alias_kmem; |
| 180 | static struct trie *trie_local = NULL, *trie_main = NULL; |
| 181 | |
| 182 | static void trie_bug(char *err) |
| 183 | { |
| 184 | printk("Trie Bug: %s\n", err); |
| 185 | BUG(); |
| 186 | } |
| 187 | |
| 188 | static inline struct node *tnode_get_child(struct tnode *tn, int i) |
| 189 | { |
| 190 | if (i >= 1<<tn->bits) |
| 191 | trie_bug("tnode_get_child"); |
| 192 | |
| 193 | return tn->child[i]; |
| 194 | } |
| 195 | |
| 196 | static inline int tnode_child_length(struct tnode *tn) |
| 197 | { |
| 198 | return 1<<tn->bits; |
| 199 | } |
| 200 | |
| 201 | /* |
| 202 | _________________________________________________________________ |
| 203 | | i | i | i | i | i | i | i | N | N | N | S | S | S | S | S | C | |
| 204 | ---------------------------------------------------------------- |
| 205 | 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 |
| 206 | |
| 207 | _________________________________________________________________ |
| 208 | | C | C | C | u | u | u | u | u | u | u | u | u | u | u | u | u | |
| 209 | ----------------------------------------------------------------- |
| 210 | 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 |
| 211 | |
| 212 | tp->pos = 7 |
| 213 | tp->bits = 3 |
| 214 | n->pos = 15 |
| 215 | n->bits=4 |
| 216 | KEYLENGTH=32 |
| 217 | */ |
| 218 | |
| 219 | static inline t_key tkey_extract_bits(t_key a, int offset, int bits) |
| 220 | { |
| 221 | if (offset < KEYLENGTH) |
| 222 | return ((t_key)(a << offset)) >> (KEYLENGTH - bits); |
| 223 | else |
| 224 | return 0; |
| 225 | } |
| 226 | |
| 227 | static inline int tkey_equals(t_key a, t_key b) |
| 228 | { |
| 229 | return a == b; |
| 230 | } |
| 231 | |
| 232 | static inline int tkey_sub_equals(t_key a, int offset, int bits, t_key b) |
| 233 | { |
| 234 | if (bits == 0 || offset >= KEYLENGTH) |
| 235 | return 1; |
| 236 | bits = bits > KEYLENGTH ? KEYLENGTH : bits; |
| 237 | return ((a ^ b) << offset) >> (KEYLENGTH - bits) == 0; |
| 238 | } |
| 239 | |
| 240 | static inline int tkey_mismatch(t_key a, int offset, t_key b) |
| 241 | { |
| 242 | t_key diff = a ^ b; |
| 243 | int i = offset; |
| 244 | |
| 245 | if (!diff) |
| 246 | return 0; |
| 247 | while ((diff << i) >> (KEYLENGTH-1) == 0) |
| 248 | i++; |
| 249 | return i; |
| 250 | } |
| 251 | |
| 252 | /* Candiate for fib_semantics */ |
| 253 | |
| 254 | static void fn_free_alias(struct fib_alias *fa) |
| 255 | { |
| 256 | fib_release_info(fa->fa_info); |
| 257 | kmem_cache_free(fn_alias_kmem, fa); |
| 258 | } |
| 259 | |
| 260 | /* |
| 261 | To understand this stuff, an understanding of keys and all their bits is |
| 262 | necessary. Every node in the trie has a key associated with it, but not |
| 263 | all of the bits in that key are significant. |
| 264 | |
| 265 | Consider a node 'n' and its parent 'tp'. |
| 266 | |
| 267 | If n is a leaf, every bit in its key is significant. Its presence is |
| 268 | necessitaded by path compression, since during a tree traversal (when |
| 269 | searching for a leaf - unless we are doing an insertion) we will completely |
| 270 | ignore all skipped bits we encounter. Thus we need to verify, at the end of |
| 271 | a potentially successful search, that we have indeed been walking the |
| 272 | correct key path. |
| 273 | |
| 274 | Note that we can never "miss" the correct key in the tree if present by |
| 275 | following the wrong path. Path compression ensures that segments of the key |
| 276 | that are the same for all keys with a given prefix are skipped, but the |
| 277 | skipped part *is* identical for each node in the subtrie below the skipped |
| 278 | bit! trie_insert() in this implementation takes care of that - note the |
| 279 | call to tkey_sub_equals() in trie_insert(). |
| 280 | |
| 281 | if n is an internal node - a 'tnode' here, the various parts of its key |
| 282 | have many different meanings. |
| 283 | |
| 284 | Example: |
| 285 | _________________________________________________________________ |
| 286 | | i | i | i | i | i | i | i | N | N | N | S | S | S | S | S | C | |
| 287 | ----------------------------------------------------------------- |
| 288 | 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 |
| 289 | |
| 290 | _________________________________________________________________ |
| 291 | | C | C | C | u | u | u | u | u | u | u | u | u | u | u | u | u | |
| 292 | ----------------------------------------------------------------- |
| 293 | 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 |
| 294 | |
| 295 | tp->pos = 7 |
| 296 | tp->bits = 3 |
| 297 | n->pos = 15 |
| 298 | n->bits=4 |
| 299 | |
| 300 | First, let's just ignore the bits that come before the parent tp, that is |
| 301 | the bits from 0 to (tp->pos-1). They are *known* but at this point we do |
| 302 | not use them for anything. |
| 303 | |
| 304 | The bits from (tp->pos) to (tp->pos + tp->bits - 1) - "N", above - are the |
| 305 | index into the parent's child array. That is, they will be used to find |
| 306 | 'n' among tp's children. |
| 307 | |
| 308 | The bits from (tp->pos + tp->bits) to (n->pos - 1) - "S" - are skipped bits |
| 309 | for the node n. |
| 310 | |
| 311 | All the bits we have seen so far are significant to the node n. The rest |
| 312 | of the bits are really not needed or indeed known in n->key. |
| 313 | |
| 314 | The bits from (n->pos) to (n->pos + n->bits - 1) - "C" - are the index into |
| 315 | n's child array, and will of course be different for each child. |
| 316 | |
| 317 | |
| 318 | The rest of the bits, from (n->pos + n->bits) onward, are completely unknown |
| 319 | at this point. |
| 320 | |
| 321 | */ |
| 322 | |
| 323 | static void check_tnode(struct tnode *tn) |
| 324 | { |
| 325 | if (tn && tn->pos+tn->bits > 32) { |
| 326 | printk("TNODE ERROR tn=%p, pos=%d, bits=%d\n", tn, tn->pos, tn->bits); |
| 327 | } |
| 328 | } |
| 329 | |
| 330 | static int halve_threshold = 25; |
| 331 | static int inflate_threshold = 50; |
| 332 | |
| 333 | static struct leaf *leaf_new(void) |
| 334 | { |
| 335 | struct leaf *l = kmalloc(sizeof(struct leaf), GFP_KERNEL); |
| 336 | if (l) { |
| 337 | NODE_INIT_PARENT(l, T_LEAF); |
| 338 | INIT_HLIST_HEAD(&l->list); |
| 339 | } |
| 340 | return l; |
| 341 | } |
| 342 | |
| 343 | static struct leaf_info *leaf_info_new(int plen) |
| 344 | { |
| 345 | struct leaf_info *li = kmalloc(sizeof(struct leaf_info), GFP_KERNEL); |
| 346 | if (li) { |
| 347 | li->plen = plen; |
| 348 | INIT_LIST_HEAD(&li->falh); |
| 349 | } |
| 350 | return li; |
| 351 | } |
| 352 | |
| 353 | static inline void free_leaf(struct leaf *l) |
| 354 | { |
| 355 | kfree(l); |
| 356 | } |
| 357 | |
| 358 | static inline void free_leaf_info(struct leaf_info *li) |
| 359 | { |
| 360 | kfree(li); |
| 361 | } |
| 362 | |
| 363 | static struct tnode *tnode_alloc(unsigned int size) |
| 364 | { |
| 365 | if (size <= PAGE_SIZE) { |
| 366 | return kmalloc(size, GFP_KERNEL); |
| 367 | } else { |
| 368 | return (struct tnode *) |
| 369 | __get_free_pages(GFP_KERNEL, get_order(size)); |
| 370 | } |
| 371 | } |
| 372 | |
| 373 | static void __tnode_free(struct tnode *tn) |
| 374 | { |
| 375 | unsigned int size = sizeof(struct tnode) + |
| 376 | (1<<tn->bits) * sizeof(struct node *); |
| 377 | |
| 378 | if (size <= PAGE_SIZE) |
| 379 | kfree(tn); |
| 380 | else |
| 381 | free_pages((unsigned long)tn, get_order(size)); |
| 382 | } |
| 383 | |
| 384 | static struct tnode* tnode_new(t_key key, int pos, int bits) |
| 385 | { |
| 386 | int nchildren = 1<<bits; |
| 387 | int sz = sizeof(struct tnode) + nchildren * sizeof(struct node *); |
| 388 | struct tnode *tn = tnode_alloc(sz); |
| 389 | |
| 390 | if (tn) { |
| 391 | memset(tn, 0, sz); |
| 392 | NODE_INIT_PARENT(tn, T_TNODE); |
| 393 | tn->pos = pos; |
| 394 | tn->bits = bits; |
| 395 | tn->key = key; |
| 396 | tn->full_children = 0; |
| 397 | tn->empty_children = 1<<bits; |
| 398 | } |
| 399 | |
| 400 | if (trie_debug > 0) |
| 401 | printk("AT %p s=%u %u\n", tn, (unsigned int) sizeof(struct tnode), |
| 402 | (unsigned int) (sizeof(struct node) * 1<<bits)); |
| 403 | return tn; |
| 404 | } |
| 405 | |
| 406 | static void tnode_free(struct tnode *tn) |
| 407 | { |
| 408 | if (!tn) { |
| 409 | trie_bug("tnode_free\n"); |
| 410 | } |
| 411 | if (IS_LEAF(tn)) { |
| 412 | free_leaf((struct leaf *)tn); |
| 413 | if (trie_debug > 0 ) |
| 414 | printk("FL %p \n", tn); |
| 415 | } |
| 416 | else if (IS_TNODE(tn)) { |
| 417 | __tnode_free(tn); |
| 418 | if (trie_debug > 0 ) |
| 419 | printk("FT %p \n", tn); |
| 420 | } |
| 421 | else { |
| 422 | trie_bug("tnode_free\n"); |
| 423 | } |
| 424 | } |
| 425 | |
| 426 | /* |
| 427 | * Check whether a tnode 'n' is "full", i.e. it is an internal node |
| 428 | * and no bits are skipped. See discussion in dyntree paper p. 6 |
| 429 | */ |
| 430 | |
| 431 | static inline int tnode_full(struct tnode *tn, struct node *n) |
| 432 | { |
| 433 | if (n == NULL || IS_LEAF(n)) |
| 434 | return 0; |
| 435 | |
| 436 | return ((struct tnode *) n)->pos == tn->pos + tn->bits; |
| 437 | } |
| 438 | |
| 439 | static inline void put_child(struct trie *t, struct tnode *tn, int i, struct node *n) |
| 440 | { |
| 441 | tnode_put_child_reorg(tn, i, n, -1); |
| 442 | } |
| 443 | |
| 444 | /* |
| 445 | * Add a child at position i overwriting the old value. |
| 446 | * Update the value of full_children and empty_children. |
| 447 | */ |
| 448 | |
| 449 | static void tnode_put_child_reorg(struct tnode *tn, int i, struct node *n, int wasfull) |
| 450 | { |
| 451 | struct node *chi; |
| 452 | int isfull; |
| 453 | |
| 454 | if (i >= 1<<tn->bits) { |
| 455 | printk("bits=%d, i=%d\n", tn->bits, i); |
| 456 | trie_bug("tnode_put_child_reorg bits"); |
| 457 | } |
| 458 | write_lock_bh(&fib_lock); |
| 459 | chi = tn->child[i]; |
| 460 | |
| 461 | /* update emptyChildren */ |
| 462 | if (n == NULL && chi != NULL) |
| 463 | tn->empty_children++; |
| 464 | else if (n != NULL && chi == NULL) |
| 465 | tn->empty_children--; |
| 466 | |
| 467 | /* update fullChildren */ |
| 468 | if (wasfull == -1) |
| 469 | wasfull = tnode_full(tn, chi); |
| 470 | |
| 471 | isfull = tnode_full(tn, n); |
| 472 | if (wasfull && !isfull) |
| 473 | tn->full_children--; |
| 474 | |
| 475 | else if (!wasfull && isfull) |
| 476 | tn->full_children++; |
| 477 | if (n) |
| 478 | NODE_SET_PARENT(n, tn); |
| 479 | |
| 480 | tn->child[i] = n; |
| 481 | write_unlock_bh(&fib_lock); |
| 482 | } |
| 483 | |
| 484 | static struct node *resize(struct trie *t, struct tnode *tn) |
| 485 | { |
| 486 | int i; |
| 487 | int err = 0; |
| 488 | |
| 489 | if (!tn) |
| 490 | return NULL; |
| 491 | |
| 492 | if (trie_debug) |
| 493 | printk("In tnode_resize %p inflate_threshold=%d threshold=%d\n", |
| 494 | tn, inflate_threshold, halve_threshold); |
| 495 | |
| 496 | /* No children */ |
| 497 | if (tn->empty_children == tnode_child_length(tn)) { |
| 498 | tnode_free(tn); |
| 499 | return NULL; |
| 500 | } |
| 501 | /* One child */ |
| 502 | if (tn->empty_children == tnode_child_length(tn) - 1) |
| 503 | for (i = 0; i < tnode_child_length(tn); i++) { |
| 504 | |
| 505 | write_lock_bh(&fib_lock); |
| 506 | if (tn->child[i] != NULL) { |
| 507 | |
| 508 | /* compress one level */ |
| 509 | struct node *n = tn->child[i]; |
| 510 | if (n) |
| 511 | NODE_INIT_PARENT(n, NODE_TYPE(n)); |
| 512 | |
| 513 | write_unlock_bh(&fib_lock); |
| 514 | tnode_free(tn); |
| 515 | return n; |
| 516 | } |
| 517 | write_unlock_bh(&fib_lock); |
| 518 | } |
| 519 | /* |
| 520 | * Double as long as the resulting node has a number of |
| 521 | * nonempty nodes that are above the threshold. |
| 522 | */ |
| 523 | |
| 524 | /* |
| 525 | * From "Implementing a dynamic compressed trie" by Stefan Nilsson of |
| 526 | * the Helsinki University of Technology and Matti Tikkanen of Nokia |
| 527 | * Telecommunications, page 6: |
| 528 | * "A node is doubled if the ratio of non-empty children to all |
| 529 | * children in the *doubled* node is at least 'high'." |
| 530 | * |
| 531 | * 'high' in this instance is the variable 'inflate_threshold'. It |
| 532 | * is expressed as a percentage, so we multiply it with |
| 533 | * tnode_child_length() and instead of multiplying by 2 (since the |
| 534 | * child array will be doubled by inflate()) and multiplying |
| 535 | * the left-hand side by 100 (to handle the percentage thing) we |
| 536 | * multiply the left-hand side by 50. |
| 537 | * |
| 538 | * The left-hand side may look a bit weird: tnode_child_length(tn) |
| 539 | * - tn->empty_children is of course the number of non-null children |
| 540 | * in the current node. tn->full_children is the number of "full" |
| 541 | * children, that is non-null tnodes with a skip value of 0. |
| 542 | * All of those will be doubled in the resulting inflated tnode, so |
| 543 | * we just count them one extra time here. |
| 544 | * |
| 545 | * A clearer way to write this would be: |
| 546 | * |
| 547 | * to_be_doubled = tn->full_children; |
| 548 | * not_to_be_doubled = tnode_child_length(tn) - tn->empty_children - |
| 549 | * tn->full_children; |
| 550 | * |
| 551 | * new_child_length = tnode_child_length(tn) * 2; |
| 552 | * |
| 553 | * new_fill_factor = 100 * (not_to_be_doubled + 2*to_be_doubled) / |
| 554 | * new_child_length; |
| 555 | * if (new_fill_factor >= inflate_threshold) |
| 556 | * |
| 557 | * ...and so on, tho it would mess up the while () loop. |
| 558 | * |
| 559 | * anyway, |
| 560 | * 100 * (not_to_be_doubled + 2*to_be_doubled) / new_child_length >= |
| 561 | * inflate_threshold |
| 562 | * |
| 563 | * avoid a division: |
| 564 | * 100 * (not_to_be_doubled + 2*to_be_doubled) >= |
| 565 | * inflate_threshold * new_child_length |
| 566 | * |
| 567 | * expand not_to_be_doubled and to_be_doubled, and shorten: |
| 568 | * 100 * (tnode_child_length(tn) - tn->empty_children + |
| 569 | * tn->full_children ) >= inflate_threshold * new_child_length |
| 570 | * |
| 571 | * expand new_child_length: |
| 572 | * 100 * (tnode_child_length(tn) - tn->empty_children + |
| 573 | * tn->full_children ) >= |
| 574 | * inflate_threshold * tnode_child_length(tn) * 2 |
| 575 | * |
| 576 | * shorten again: |
| 577 | * 50 * (tn->full_children + tnode_child_length(tn) - |
| 578 | * tn->empty_children ) >= inflate_threshold * |
| 579 | * tnode_child_length(tn) |
| 580 | * |
| 581 | */ |
| 582 | |
| 583 | check_tnode(tn); |
| 584 | |
| 585 | err = 0; |
| 586 | while ((tn->full_children > 0 && |
| 587 | 50 * (tn->full_children + tnode_child_length(tn) - tn->empty_children) >= |
| 588 | inflate_threshold * tnode_child_length(tn))) { |
| 589 | |
| 590 | tn = inflate(t, tn, &err); |
| 591 | |
| 592 | if (err) { |
| 593 | #ifdef CONFIG_IP_FIB_TRIE_STATS |
| 594 | t->stats.resize_node_skipped++; |
| 595 | #endif |
| 596 | break; |
| 597 | } |
| 598 | } |
| 599 | |
| 600 | check_tnode(tn); |
| 601 | |
| 602 | /* |
| 603 | * Halve as long as the number of empty children in this |
| 604 | * node is above threshold. |
| 605 | */ |
| 606 | |
| 607 | err = 0; |
| 608 | while (tn->bits > 1 && |
| 609 | 100 * (tnode_child_length(tn) - tn->empty_children) < |
| 610 | halve_threshold * tnode_child_length(tn)) { |
| 611 | |
| 612 | tn = halve(t, tn, &err); |
| 613 | |
| 614 | if (err) { |
| 615 | #ifdef CONFIG_IP_FIB_TRIE_STATS |
| 616 | t->stats.resize_node_skipped++; |
| 617 | #endif |
| 618 | break; |
| 619 | } |
| 620 | } |
| 621 | |
| 622 | |
| 623 | /* Only one child remains */ |
| 624 | |
| 625 | if (tn->empty_children == tnode_child_length(tn) - 1) |
| 626 | for (i = 0; i < tnode_child_length(tn); i++) { |
| 627 | |
| 628 | write_lock_bh(&fib_lock); |
| 629 | if (tn->child[i] != NULL) { |
| 630 | /* compress one level */ |
| 631 | struct node *n = tn->child[i]; |
| 632 | |
| 633 | if (n) |
| 634 | NODE_INIT_PARENT(n, NODE_TYPE(n)); |
| 635 | |
| 636 | write_unlock_bh(&fib_lock); |
| 637 | tnode_free(tn); |
| 638 | return n; |
| 639 | } |
| 640 | write_unlock_bh(&fib_lock); |
| 641 | } |
| 642 | |
| 643 | return (struct node *) tn; |
| 644 | } |
| 645 | |
| 646 | static struct tnode *inflate(struct trie *t, struct tnode *tn, int *err) |
| 647 | { |
| 648 | struct tnode *inode; |
| 649 | struct tnode *oldtnode = tn; |
| 650 | int olen = tnode_child_length(tn); |
| 651 | int i; |
| 652 | |
| 653 | if (trie_debug) |
| 654 | printk("In inflate\n"); |
| 655 | |
| 656 | tn = tnode_new(oldtnode->key, oldtnode->pos, oldtnode->bits + 1); |
| 657 | |
| 658 | if (!tn) { |
| 659 | *err = -ENOMEM; |
| 660 | return oldtnode; |
| 661 | } |
| 662 | |
| 663 | /* |
| 664 | * Preallocate and store tnodes before the actual work so we |
| 665 | * don't get into an inconsistent state if memory allocation |
| 666 | * fails. In case of failure we return the oldnode and inflate |
| 667 | * of tnode is ignored. |
| 668 | */ |
| 669 | |
| 670 | for(i = 0; i < olen; i++) { |
| 671 | struct tnode *inode = (struct tnode *) tnode_get_child(oldtnode, i); |
| 672 | |
| 673 | if (inode && |
| 674 | IS_TNODE(inode) && |
| 675 | inode->pos == oldtnode->pos + oldtnode->bits && |
| 676 | inode->bits > 1) { |
| 677 | struct tnode *left, *right; |
| 678 | |
| 679 | t_key m = TKEY_GET_MASK(inode->pos, 1); |
| 680 | |
| 681 | left = tnode_new(inode->key&(~m), inode->pos + 1, |
| 682 | inode->bits - 1); |
| 683 | |
| 684 | if (!left) { |
| 685 | *err = -ENOMEM; |
| 686 | break; |
| 687 | } |
| 688 | |
| 689 | right = tnode_new(inode->key|m, inode->pos + 1, |
| 690 | inode->bits - 1); |
| 691 | |
| 692 | if (!right) { |
| 693 | *err = -ENOMEM; |
| 694 | break; |
| 695 | } |
| 696 | |
| 697 | put_child(t, tn, 2*i, (struct node *) left); |
| 698 | put_child(t, tn, 2*i+1, (struct node *) right); |
| 699 | } |
| 700 | } |
| 701 | |
| 702 | if (*err) { |
| 703 | int size = tnode_child_length(tn); |
| 704 | int j; |
| 705 | |
| 706 | for(j = 0; j < size; j++) |
| 707 | if (tn->child[j]) |
| 708 | tnode_free((struct tnode *)tn->child[j]); |
| 709 | |
| 710 | tnode_free(tn); |
| 711 | |
| 712 | *err = -ENOMEM; |
| 713 | return oldtnode; |
| 714 | } |
| 715 | |
| 716 | for(i = 0; i < olen; i++) { |
| 717 | struct node *node = tnode_get_child(oldtnode, i); |
| 718 | |
| 719 | /* An empty child */ |
| 720 | if (node == NULL) |
| 721 | continue; |
| 722 | |
| 723 | /* A leaf or an internal node with skipped bits */ |
| 724 | |
| 725 | if (IS_LEAF(node) || ((struct tnode *) node)->pos > |
| 726 | tn->pos + tn->bits - 1) { |
| 727 | if (tkey_extract_bits(node->key, oldtnode->pos + oldtnode->bits, |
| 728 | 1) == 0) |
| 729 | put_child(t, tn, 2*i, node); |
| 730 | else |
| 731 | put_child(t, tn, 2*i+1, node); |
| 732 | continue; |
| 733 | } |
| 734 | |
| 735 | /* An internal node with two children */ |
| 736 | inode = (struct tnode *) node; |
| 737 | |
| 738 | if (inode->bits == 1) { |
| 739 | put_child(t, tn, 2*i, inode->child[0]); |
| 740 | put_child(t, tn, 2*i+1, inode->child[1]); |
| 741 | |
| 742 | tnode_free(inode); |
| 743 | } |
| 744 | |
| 745 | /* An internal node with more than two children */ |
| 746 | else { |
| 747 | struct tnode *left, *right; |
| 748 | int size, j; |
| 749 | |
| 750 | /* We will replace this node 'inode' with two new |
| 751 | * ones, 'left' and 'right', each with half of the |
| 752 | * original children. The two new nodes will have |
| 753 | * a position one bit further down the key and this |
| 754 | * means that the "significant" part of their keys |
| 755 | * (see the discussion near the top of this file) |
| 756 | * will differ by one bit, which will be "0" in |
| 757 | * left's key and "1" in right's key. Since we are |
| 758 | * moving the key position by one step, the bit that |
| 759 | * we are moving away from - the bit at position |
| 760 | * (inode->pos) - is the one that will differ between |
| 761 | * left and right. So... we synthesize that bit in the |
| 762 | * two new keys. |
| 763 | * The mask 'm' below will be a single "one" bit at |
| 764 | * the position (inode->pos) |
| 765 | */ |
| 766 | |
| 767 | /* Use the old key, but set the new significant |
| 768 | * bit to zero. |
| 769 | */ |
| 770 | |
| 771 | left = (struct tnode *) tnode_get_child(tn, 2*i); |
| 772 | put_child(t, tn, 2*i, NULL); |
| 773 | |
| 774 | if (!left) |
| 775 | BUG(); |
| 776 | |
| 777 | right = (struct tnode *) tnode_get_child(tn, 2*i+1); |
| 778 | put_child(t, tn, 2*i+1, NULL); |
| 779 | |
| 780 | if (!right) |
| 781 | BUG(); |
| 782 | |
| 783 | size = tnode_child_length(left); |
| 784 | for(j = 0; j < size; j++) { |
| 785 | put_child(t, left, j, inode->child[j]); |
| 786 | put_child(t, right, j, inode->child[j + size]); |
| 787 | } |
| 788 | put_child(t, tn, 2*i, resize(t, left)); |
| 789 | put_child(t, tn, 2*i+1, resize(t, right)); |
| 790 | |
| 791 | tnode_free(inode); |
| 792 | } |
| 793 | } |
| 794 | tnode_free(oldtnode); |
| 795 | return tn; |
| 796 | } |
| 797 | |
| 798 | static struct tnode *halve(struct trie *t, struct tnode *tn, int *err) |
| 799 | { |
| 800 | struct tnode *oldtnode = tn; |
| 801 | struct node *left, *right; |
| 802 | int i; |
| 803 | int olen = tnode_child_length(tn); |
| 804 | |
| 805 | if (trie_debug) printk("In halve\n"); |
| 806 | |
| 807 | tn = tnode_new(oldtnode->key, oldtnode->pos, oldtnode->bits - 1); |
| 808 | |
| 809 | if (!tn) { |
| 810 | *err = -ENOMEM; |
| 811 | return oldtnode; |
| 812 | } |
| 813 | |
| 814 | /* |
| 815 | * Preallocate and store tnodes before the actual work so we |
| 816 | * don't get into an inconsistent state if memory allocation |
| 817 | * fails. In case of failure we return the oldnode and halve |
| 818 | * of tnode is ignored. |
| 819 | */ |
| 820 | |
| 821 | for(i = 0; i < olen; i += 2) { |
| 822 | left = tnode_get_child(oldtnode, i); |
| 823 | right = tnode_get_child(oldtnode, i+1); |
| 824 | |
| 825 | /* Two nonempty children */ |
| 826 | if (left && right) { |
| 827 | struct tnode *newBinNode = |
| 828 | tnode_new(left->key, tn->pos + tn->bits, 1); |
| 829 | |
| 830 | if (!newBinNode) { |
| 831 | *err = -ENOMEM; |
| 832 | break; |
| 833 | } |
| 834 | put_child(t, tn, i/2, (struct node *)newBinNode); |
| 835 | } |
| 836 | } |
| 837 | |
| 838 | if (*err) { |
| 839 | int size = tnode_child_length(tn); |
| 840 | int j; |
| 841 | |
| 842 | for(j = 0; j < size; j++) |
| 843 | if (tn->child[j]) |
| 844 | tnode_free((struct tnode *)tn->child[j]); |
| 845 | |
| 846 | tnode_free(tn); |
| 847 | |
| 848 | *err = -ENOMEM; |
| 849 | return oldtnode; |
| 850 | } |
| 851 | |
| 852 | for(i = 0; i < olen; i += 2) { |
| 853 | left = tnode_get_child(oldtnode, i); |
| 854 | right = tnode_get_child(oldtnode, i+1); |
| 855 | |
| 856 | /* At least one of the children is empty */ |
| 857 | if (left == NULL) { |
| 858 | if (right == NULL) /* Both are empty */ |
| 859 | continue; |
| 860 | put_child(t, tn, i/2, right); |
| 861 | } else if (right == NULL) |
| 862 | put_child(t, tn, i/2, left); |
| 863 | |
| 864 | /* Two nonempty children */ |
| 865 | else { |
| 866 | struct tnode *newBinNode = |
| 867 | (struct tnode *) tnode_get_child(tn, i/2); |
| 868 | put_child(t, tn, i/2, NULL); |
| 869 | |
| 870 | if (!newBinNode) |
| 871 | BUG(); |
| 872 | |
| 873 | put_child(t, newBinNode, 0, left); |
| 874 | put_child(t, newBinNode, 1, right); |
| 875 | put_child(t, tn, i/2, resize(t, newBinNode)); |
| 876 | } |
| 877 | } |
| 878 | tnode_free(oldtnode); |
| 879 | return tn; |
| 880 | } |
| 881 | |
| 882 | static void *trie_init(struct trie *t) |
| 883 | { |
| 884 | if (t) { |
| 885 | t->size = 0; |
| 886 | t->trie = NULL; |
| 887 | t->revision = 0; |
| 888 | #ifdef CONFIG_IP_FIB_TRIE_STATS |
| 889 | memset(&t->stats, 0, sizeof(struct trie_use_stats)); |
| 890 | #endif |
| 891 | } |
| 892 | return t; |
| 893 | } |
| 894 | |
| 895 | static struct leaf_info *find_leaf_info(struct hlist_head *head, int plen) |
| 896 | { |
| 897 | struct hlist_node *node; |
| 898 | struct leaf_info *li; |
| 899 | |
| 900 | hlist_for_each_entry(li, node, head, hlist) { |
| 901 | if (li->plen == plen) |
| 902 | return li; |
| 903 | } |
| 904 | return NULL; |
| 905 | } |
| 906 | |
| 907 | static inline struct list_head * get_fa_head(struct leaf *l, int plen) |
| 908 | { |
| 909 | struct list_head *fa_head = NULL; |
| 910 | struct leaf_info *li = find_leaf_info(&l->list, plen); |
| 911 | |
| 912 | if (li) |
| 913 | fa_head = &li->falh; |
| 914 | |
| 915 | return fa_head; |
| 916 | } |
| 917 | |
| 918 | static void insert_leaf_info(struct hlist_head *head, struct leaf_info *new) |
| 919 | { |
| 920 | struct leaf_info *li = NULL, *last = NULL; |
| 921 | struct hlist_node *node, *tmp; |
| 922 | |
| 923 | write_lock_bh(&fib_lock); |
| 924 | |
| 925 | if (hlist_empty(head)) |
| 926 | hlist_add_head(&new->hlist, head); |
| 927 | else { |
| 928 | hlist_for_each_entry_safe(li, node, tmp, head, hlist) { |
| 929 | |
| 930 | if (new->plen > li->plen) |
| 931 | break; |
| 932 | |
| 933 | last = li; |
| 934 | } |
| 935 | if (last) |
| 936 | hlist_add_after(&last->hlist, &new->hlist); |
| 937 | else |
| 938 | hlist_add_before(&new->hlist, &li->hlist); |
| 939 | } |
| 940 | write_unlock_bh(&fib_lock); |
| 941 | } |
| 942 | |
| 943 | static struct leaf * |
| 944 | fib_find_node(struct trie *t, u32 key) |
| 945 | { |
| 946 | int pos; |
| 947 | struct tnode *tn; |
| 948 | struct node *n; |
| 949 | |
| 950 | pos = 0; |
| 951 | n = t->trie; |
| 952 | |
| 953 | while (n != NULL && NODE_TYPE(n) == T_TNODE) { |
| 954 | tn = (struct tnode *) n; |
| 955 | |
| 956 | check_tnode(tn); |
| 957 | |
| 958 | if (tkey_sub_equals(tn->key, pos, tn->pos-pos, key)) { |
| 959 | pos=tn->pos + tn->bits; |
| 960 | n = tnode_get_child(tn, tkey_extract_bits(key, tn->pos, tn->bits)); |
| 961 | } |
| 962 | else |
| 963 | break; |
| 964 | } |
| 965 | /* Case we have found a leaf. Compare prefixes */ |
| 966 | |
| 967 | if (n != NULL && IS_LEAF(n) && tkey_equals(key, n->key)) { |
| 968 | struct leaf *l = (struct leaf *) n; |
| 969 | return l; |
| 970 | } |
| 971 | return NULL; |
| 972 | } |
| 973 | |
| 974 | static struct node *trie_rebalance(struct trie *t, struct tnode *tn) |
| 975 | { |
| 976 | int i = 0; |
| 977 | int wasfull; |
| 978 | t_key cindex, key; |
| 979 | struct tnode *tp = NULL; |
| 980 | |
| 981 | if (!tn) |
| 982 | BUG(); |
| 983 | |
| 984 | key = tn->key; |
| 985 | i = 0; |
| 986 | |
| 987 | while (tn != NULL && NODE_PARENT(tn) != NULL) { |
| 988 | |
| 989 | if (i > 10) { |
| 990 | printk("Rebalance tn=%p \n", tn); |
| 991 | if (tn) printk("tn->parent=%p \n", NODE_PARENT(tn)); |
| 992 | |
| 993 | printk("Rebalance tp=%p \n", tp); |
| 994 | if (tp) printk("tp->parent=%p \n", NODE_PARENT(tp)); |
| 995 | } |
| 996 | |
| 997 | if (i > 12) BUG(); |
| 998 | i++; |
| 999 | |
| 1000 | tp = NODE_PARENT(tn); |
| 1001 | cindex = tkey_extract_bits(key, tp->pos, tp->bits); |
| 1002 | wasfull = tnode_full(tp, tnode_get_child(tp, cindex)); |
| 1003 | tn = (struct tnode *) resize (t, (struct tnode *)tn); |
| 1004 | tnode_put_child_reorg((struct tnode *)tp, cindex,(struct node*)tn, wasfull); |
| 1005 | |
| 1006 | if (!NODE_PARENT(tn)) |
| 1007 | break; |
| 1008 | |
| 1009 | tn = NODE_PARENT(tn); |
| 1010 | } |
| 1011 | /* Handle last (top) tnode */ |
| 1012 | if (IS_TNODE(tn)) |
| 1013 | tn = (struct tnode*) resize(t, (struct tnode *)tn); |
| 1014 | |
| 1015 | return (struct node*) tn; |
| 1016 | } |
| 1017 | |
| 1018 | static struct list_head * |
| 1019 | fib_insert_node(struct trie *t, int *err, u32 key, int plen) |
| 1020 | { |
| 1021 | int pos, newpos; |
| 1022 | struct tnode *tp = NULL, *tn = NULL; |
| 1023 | struct node *n; |
| 1024 | struct leaf *l; |
| 1025 | int missbit; |
| 1026 | struct list_head *fa_head = NULL; |
| 1027 | struct leaf_info *li; |
| 1028 | t_key cindex; |
| 1029 | |
| 1030 | pos = 0; |
| 1031 | n = t->trie; |
| 1032 | |
| 1033 | /* If we point to NULL, stop. Either the tree is empty and we should |
| 1034 | * just put a new leaf in if, or we have reached an empty child slot, |
| 1035 | * and we should just put our new leaf in that. |
| 1036 | * If we point to a T_TNODE, check if it matches our key. Note that |
| 1037 | * a T_TNODE might be skipping any number of bits - its 'pos' need |
| 1038 | * not be the parent's 'pos'+'bits'! |
| 1039 | * |
| 1040 | * If it does match the current key, get pos/bits from it, extract |
| 1041 | * the index from our key, push the T_TNODE and walk the tree. |
| 1042 | * |
| 1043 | * If it doesn't, we have to replace it with a new T_TNODE. |
| 1044 | * |
| 1045 | * If we point to a T_LEAF, it might or might not have the same key |
| 1046 | * as we do. If it does, just change the value, update the T_LEAF's |
| 1047 | * value, and return it. |
| 1048 | * If it doesn't, we need to replace it with a T_TNODE. |
| 1049 | */ |
| 1050 | |
| 1051 | while (n != NULL && NODE_TYPE(n) == T_TNODE) { |
| 1052 | tn = (struct tnode *) n; |
| 1053 | |
| 1054 | check_tnode(tn); |
| 1055 | |
| 1056 | if (tkey_sub_equals(tn->key, pos, tn->pos-pos, key)) { |
| 1057 | tp = tn; |
| 1058 | pos=tn->pos + tn->bits; |
| 1059 | n = tnode_get_child(tn, tkey_extract_bits(key, tn->pos, tn->bits)); |
| 1060 | |
| 1061 | if (n && NODE_PARENT(n) != tn) { |
| 1062 | printk("BUG tn=%p, n->parent=%p\n", tn, NODE_PARENT(n)); |
| 1063 | BUG(); |
| 1064 | } |
| 1065 | } |
| 1066 | else |
| 1067 | break; |
| 1068 | } |
| 1069 | |
| 1070 | /* |
| 1071 | * n ----> NULL, LEAF or TNODE |
| 1072 | * |
| 1073 | * tp is n's (parent) ----> NULL or TNODE |
| 1074 | */ |
| 1075 | |
| 1076 | if (tp && IS_LEAF(tp)) |
| 1077 | BUG(); |
| 1078 | |
| 1079 | |
| 1080 | /* Case 1: n is a leaf. Compare prefixes */ |
| 1081 | |
| 1082 | if (n != NULL && IS_LEAF(n) && tkey_equals(key, n->key)) { |
| 1083 | struct leaf *l = ( struct leaf *) n; |
| 1084 | |
| 1085 | li = leaf_info_new(plen); |
| 1086 | |
| 1087 | if (!li) { |
| 1088 | *err = -ENOMEM; |
| 1089 | goto err; |
| 1090 | } |
| 1091 | |
| 1092 | fa_head = &li->falh; |
| 1093 | insert_leaf_info(&l->list, li); |
| 1094 | goto done; |
| 1095 | } |
| 1096 | t->size++; |
| 1097 | l = leaf_new(); |
| 1098 | |
| 1099 | if (!l) { |
| 1100 | *err = -ENOMEM; |
| 1101 | goto err; |
| 1102 | } |
| 1103 | |
| 1104 | l->key = key; |
| 1105 | li = leaf_info_new(plen); |
| 1106 | |
| 1107 | if (!li) { |
| 1108 | tnode_free((struct tnode *) l); |
| 1109 | *err = -ENOMEM; |
| 1110 | goto err; |
| 1111 | } |
| 1112 | |
| 1113 | fa_head = &li->falh; |
| 1114 | insert_leaf_info(&l->list, li); |
| 1115 | |
| 1116 | /* Case 2: n is NULL, and will just insert a new leaf */ |
| 1117 | if (t->trie && n == NULL) { |
| 1118 | |
| 1119 | NODE_SET_PARENT(l, tp); |
| 1120 | |
| 1121 | if (!tp) |
| 1122 | BUG(); |
| 1123 | |
| 1124 | else { |
| 1125 | cindex = tkey_extract_bits(key, tp->pos, tp->bits); |
| 1126 | put_child(t, (struct tnode *)tp, cindex, (struct node *)l); |
| 1127 | } |
| 1128 | } |
| 1129 | /* Case 3: n is a LEAF or a TNODE and the key doesn't match. */ |
| 1130 | else { |
| 1131 | /* |
| 1132 | * Add a new tnode here |
| 1133 | * first tnode need some special handling |
| 1134 | */ |
| 1135 | |
| 1136 | if (tp) |
| 1137 | pos=tp->pos+tp->bits; |
| 1138 | else |
| 1139 | pos=0; |
| 1140 | if (n) { |
| 1141 | newpos = tkey_mismatch(key, pos, n->key); |
| 1142 | tn = tnode_new(n->key, newpos, 1); |
| 1143 | } |
| 1144 | else { |
| 1145 | newpos = 0; |
| 1146 | tn = tnode_new(key, newpos, 1); /* First tnode */ |
| 1147 | } |
| 1148 | |
| 1149 | if (!tn) { |
| 1150 | free_leaf_info(li); |
| 1151 | tnode_free((struct tnode *) l); |
| 1152 | *err = -ENOMEM; |
| 1153 | goto err; |
| 1154 | } |
| 1155 | |
| 1156 | NODE_SET_PARENT(tn, tp); |
| 1157 | |
| 1158 | missbit=tkey_extract_bits(key, newpos, 1); |
| 1159 | put_child(t, tn, missbit, (struct node *)l); |
| 1160 | put_child(t, tn, 1-missbit, n); |
| 1161 | |
| 1162 | if (tp) { |
| 1163 | cindex = tkey_extract_bits(key, tp->pos, tp->bits); |
| 1164 | put_child(t, (struct tnode *)tp, cindex, (struct node *)tn); |
| 1165 | } |
| 1166 | else { |
| 1167 | t->trie = (struct node*) tn; /* First tnode */ |
| 1168 | tp = tn; |
| 1169 | } |
| 1170 | } |
| 1171 | if (tp && tp->pos+tp->bits > 32) { |
| 1172 | printk("ERROR tp=%p pos=%d, bits=%d, key=%0x plen=%d\n", |
| 1173 | tp, tp->pos, tp->bits, key, plen); |
| 1174 | } |
| 1175 | /* Rebalance the trie */ |
| 1176 | t->trie = trie_rebalance(t, tp); |
| 1177 | done: |
| 1178 | t->revision++; |
| 1179 | err:; |
| 1180 | return fa_head; |
| 1181 | } |
| 1182 | |
| 1183 | static int |
| 1184 | fn_trie_insert(struct fib_table *tb, struct rtmsg *r, struct kern_rta *rta, |
| 1185 | struct nlmsghdr *nlhdr, struct netlink_skb_parms *req) |
| 1186 | { |
| 1187 | struct trie *t = (struct trie *) tb->tb_data; |
| 1188 | struct fib_alias *fa, *new_fa; |
| 1189 | struct list_head *fa_head = NULL; |
| 1190 | struct fib_info *fi; |
| 1191 | int plen = r->rtm_dst_len; |
| 1192 | int type = r->rtm_type; |
| 1193 | u8 tos = r->rtm_tos; |
| 1194 | u32 key, mask; |
| 1195 | int err; |
| 1196 | struct leaf *l; |
| 1197 | |
| 1198 | if (plen > 32) |
| 1199 | return -EINVAL; |
| 1200 | |
| 1201 | key = 0; |
| 1202 | if (rta->rta_dst) |
| 1203 | memcpy(&key, rta->rta_dst, 4); |
| 1204 | |
| 1205 | key = ntohl(key); |
| 1206 | |
| 1207 | if (trie_debug) |
| 1208 | printk("Insert table=%d %08x/%d\n", tb->tb_id, key, plen); |
| 1209 | |
| 1210 | mask = ntohl( inet_make_mask(plen) ); |
| 1211 | |
| 1212 | if (key & ~mask) |
| 1213 | return -EINVAL; |
| 1214 | |
| 1215 | key = key & mask; |
| 1216 | |
| 1217 | if ((fi = fib_create_info(r, rta, nlhdr, &err)) == NULL) |
| 1218 | goto err; |
| 1219 | |
| 1220 | l = fib_find_node(t, key); |
| 1221 | fa = NULL; |
| 1222 | |
| 1223 | if (l) { |
| 1224 | fa_head = get_fa_head(l, plen); |
| 1225 | fa = fib_find_alias(fa_head, tos, fi->fib_priority); |
| 1226 | } |
| 1227 | |
| 1228 | /* Now fa, if non-NULL, points to the first fib alias |
| 1229 | * with the same keys [prefix,tos,priority], if such key already |
| 1230 | * exists or to the node before which we will insert new one. |
| 1231 | * |
| 1232 | * If fa is NULL, we will need to allocate a new one and |
| 1233 | * insert to the head of f. |
| 1234 | * |
| 1235 | * If f is NULL, no fib node matched the destination key |
| 1236 | * and we need to allocate a new one of those as well. |
| 1237 | */ |
| 1238 | |
| 1239 | if (fa && |
| 1240 | fa->fa_info->fib_priority == fi->fib_priority) { |
| 1241 | struct fib_alias *fa_orig; |
| 1242 | |
| 1243 | err = -EEXIST; |
| 1244 | if (nlhdr->nlmsg_flags & NLM_F_EXCL) |
| 1245 | goto out; |
| 1246 | |
| 1247 | if (nlhdr->nlmsg_flags & NLM_F_REPLACE) { |
| 1248 | struct fib_info *fi_drop; |
| 1249 | u8 state; |
| 1250 | |
| 1251 | write_lock_bh(&fib_lock); |
| 1252 | |
| 1253 | fi_drop = fa->fa_info; |
| 1254 | fa->fa_info = fi; |
| 1255 | fa->fa_type = type; |
| 1256 | fa->fa_scope = r->rtm_scope; |
| 1257 | state = fa->fa_state; |
| 1258 | fa->fa_state &= ~FA_S_ACCESSED; |
| 1259 | |
| 1260 | write_unlock_bh(&fib_lock); |
| 1261 | |
| 1262 | fib_release_info(fi_drop); |
| 1263 | if (state & FA_S_ACCESSED) |
| 1264 | rt_cache_flush(-1); |
| 1265 | |
| 1266 | goto succeeded; |
| 1267 | } |
| 1268 | /* Error if we find a perfect match which |
| 1269 | * uses the same scope, type, and nexthop |
| 1270 | * information. |
| 1271 | */ |
| 1272 | fa_orig = fa; |
| 1273 | list_for_each_entry(fa, fa_orig->fa_list.prev, fa_list) { |
| 1274 | if (fa->fa_tos != tos) |
| 1275 | break; |
| 1276 | if (fa->fa_info->fib_priority != fi->fib_priority) |
| 1277 | break; |
| 1278 | if (fa->fa_type == type && |
| 1279 | fa->fa_scope == r->rtm_scope && |
| 1280 | fa->fa_info == fi) { |
| 1281 | goto out; |
| 1282 | } |
| 1283 | } |
| 1284 | if (!(nlhdr->nlmsg_flags & NLM_F_APPEND)) |
| 1285 | fa = fa_orig; |
| 1286 | } |
| 1287 | err = -ENOENT; |
| 1288 | if (!(nlhdr->nlmsg_flags&NLM_F_CREATE)) |
| 1289 | goto out; |
| 1290 | |
| 1291 | err = -ENOBUFS; |
| 1292 | new_fa = kmem_cache_alloc(fn_alias_kmem, SLAB_KERNEL); |
| 1293 | if (new_fa == NULL) |
| 1294 | goto out; |
| 1295 | |
| 1296 | new_fa->fa_info = fi; |
| 1297 | new_fa->fa_tos = tos; |
| 1298 | new_fa->fa_type = type; |
| 1299 | new_fa->fa_scope = r->rtm_scope; |
| 1300 | new_fa->fa_state = 0; |
| 1301 | #if 0 |
| 1302 | new_fa->dst = NULL; |
| 1303 | #endif |
| 1304 | /* |
| 1305 | * Insert new entry to the list. |
| 1306 | */ |
| 1307 | |
| 1308 | if (!fa_head) { |
| 1309 | fa_head = fib_insert_node(t, &err, key, plen); |
| 1310 | err = 0; |
| 1311 | if (err) |
| 1312 | goto out_free_new_fa; |
| 1313 | } |
| 1314 | |
| 1315 | write_lock_bh(&fib_lock); |
| 1316 | |
| 1317 | list_add_tail(&new_fa->fa_list, |
| 1318 | (fa ? &fa->fa_list : fa_head)); |
| 1319 | |
| 1320 | write_unlock_bh(&fib_lock); |
| 1321 | |
| 1322 | rt_cache_flush(-1); |
| 1323 | rtmsg_fib(RTM_NEWROUTE, htonl(key), new_fa, plen, tb->tb_id, nlhdr, req); |
| 1324 | succeeded: |
| 1325 | return 0; |
| 1326 | |
| 1327 | out_free_new_fa: |
| 1328 | kmem_cache_free(fn_alias_kmem, new_fa); |
| 1329 | out: |
| 1330 | fib_release_info(fi); |
| 1331 | err:; |
| 1332 | return err; |
| 1333 | } |
| 1334 | |
| 1335 | static inline int check_leaf(struct trie *t, struct leaf *l, t_key key, int *plen, const struct flowi *flp, |
| 1336 | struct fib_result *res) |
| 1337 | { |
| 1338 | int err, i; |
| 1339 | t_key mask; |
| 1340 | struct leaf_info *li; |
| 1341 | struct hlist_head *hhead = &l->list; |
| 1342 | struct hlist_node *node; |
| 1343 | |
| 1344 | hlist_for_each_entry(li, node, hhead, hlist) { |
| 1345 | |
| 1346 | i = li->plen; |
| 1347 | mask = ntohl(inet_make_mask(i)); |
| 1348 | if (l->key != (key & mask)) |
| 1349 | continue; |
| 1350 | |
| 1351 | if ((err = fib_semantic_match(&li->falh, flp, res, l->key, mask, i)) <= 0) { |
| 1352 | *plen = i; |
| 1353 | #ifdef CONFIG_IP_FIB_TRIE_STATS |
| 1354 | t->stats.semantic_match_passed++; |
| 1355 | #endif |
| 1356 | return err; |
| 1357 | } |
| 1358 | #ifdef CONFIG_IP_FIB_TRIE_STATS |
| 1359 | t->stats.semantic_match_miss++; |
| 1360 | #endif |
| 1361 | } |
| 1362 | return 1; |
| 1363 | } |
| 1364 | |
| 1365 | static int |
| 1366 | fn_trie_lookup(struct fib_table *tb, const struct flowi *flp, struct fib_result *res) |
| 1367 | { |
| 1368 | struct trie *t = (struct trie *) tb->tb_data; |
| 1369 | int plen, ret = 0; |
| 1370 | struct node *n; |
| 1371 | struct tnode *pn; |
| 1372 | int pos, bits; |
| 1373 | t_key key=ntohl(flp->fl4_dst); |
| 1374 | int chopped_off; |
| 1375 | t_key cindex = 0; |
| 1376 | int current_prefix_length = KEYLENGTH; |
| 1377 | n = t->trie; |
| 1378 | |
| 1379 | read_lock(&fib_lock); |
| 1380 | if (!n) |
| 1381 | goto failed; |
| 1382 | |
| 1383 | #ifdef CONFIG_IP_FIB_TRIE_STATS |
| 1384 | t->stats.gets++; |
| 1385 | #endif |
| 1386 | |
| 1387 | /* Just a leaf? */ |
| 1388 | if (IS_LEAF(n)) { |
| 1389 | if ((ret = check_leaf(t, (struct leaf *)n, key, &plen, flp, res)) <= 0) |
| 1390 | goto found; |
| 1391 | goto failed; |
| 1392 | } |
| 1393 | pn = (struct tnode *) n; |
| 1394 | chopped_off = 0; |
| 1395 | |
| 1396 | while (pn) { |
| 1397 | |
| 1398 | pos = pn->pos; |
| 1399 | bits = pn->bits; |
| 1400 | |
| 1401 | if (!chopped_off) |
| 1402 | cindex = tkey_extract_bits(MASK_PFX(key, current_prefix_length), pos, bits); |
| 1403 | |
| 1404 | n = tnode_get_child(pn, cindex); |
| 1405 | |
| 1406 | if (n == NULL) { |
| 1407 | #ifdef CONFIG_IP_FIB_TRIE_STATS |
| 1408 | t->stats.null_node_hit++; |
| 1409 | #endif |
| 1410 | goto backtrace; |
| 1411 | } |
| 1412 | |
| 1413 | if (IS_TNODE(n)) { |
| 1414 | #define HL_OPTIMIZE |
| 1415 | #ifdef HL_OPTIMIZE |
| 1416 | struct tnode *cn = (struct tnode *)n; |
| 1417 | t_key node_prefix, key_prefix, pref_mismatch; |
| 1418 | int mp; |
| 1419 | |
| 1420 | /* |
| 1421 | * It's a tnode, and we can do some extra checks here if we |
| 1422 | * like, to avoid descending into a dead-end branch. |
| 1423 | * This tnode is in the parent's child array at index |
| 1424 | * key[p_pos..p_pos+p_bits] but potentially with some bits |
| 1425 | * chopped off, so in reality the index may be just a |
| 1426 | * subprefix, padded with zero at the end. |
| 1427 | * We can also take a look at any skipped bits in this |
| 1428 | * tnode - everything up to p_pos is supposed to be ok, |
| 1429 | * and the non-chopped bits of the index (se previous |
| 1430 | * paragraph) are also guaranteed ok, but the rest is |
| 1431 | * considered unknown. |
| 1432 | * |
| 1433 | * The skipped bits are key[pos+bits..cn->pos]. |
| 1434 | */ |
| 1435 | |
| 1436 | /* If current_prefix_length < pos+bits, we are already doing |
| 1437 | * actual prefix matching, which means everything from |
| 1438 | * pos+(bits-chopped_off) onward must be zero along some |
| 1439 | * branch of this subtree - otherwise there is *no* valid |
| 1440 | * prefix present. Here we can only check the skipped |
| 1441 | * bits. Remember, since we have already indexed into the |
| 1442 | * parent's child array, we know that the bits we chopped of |
| 1443 | * *are* zero. |
| 1444 | */ |
| 1445 | |
| 1446 | /* NOTA BENE: CHECKING ONLY SKIPPED BITS FOR THE NEW NODE HERE */ |
| 1447 | |
| 1448 | if (current_prefix_length < pos+bits) { |
| 1449 | if (tkey_extract_bits(cn->key, current_prefix_length, |
| 1450 | cn->pos - current_prefix_length) != 0 || |
| 1451 | !(cn->child[0])) |
| 1452 | goto backtrace; |
| 1453 | } |
| 1454 | |
| 1455 | /* |
| 1456 | * If chopped_off=0, the index is fully validated and we |
| 1457 | * only need to look at the skipped bits for this, the new, |
| 1458 | * tnode. What we actually want to do is to find out if |
| 1459 | * these skipped bits match our key perfectly, or if we will |
| 1460 | * have to count on finding a matching prefix further down, |
| 1461 | * because if we do, we would like to have some way of |
| 1462 | * verifying the existence of such a prefix at this point. |
| 1463 | */ |
| 1464 | |
| 1465 | /* The only thing we can do at this point is to verify that |
| 1466 | * any such matching prefix can indeed be a prefix to our |
| 1467 | * key, and if the bits in the node we are inspecting that |
| 1468 | * do not match our key are not ZERO, this cannot be true. |
| 1469 | * Thus, find out where there is a mismatch (before cn->pos) |
| 1470 | * and verify that all the mismatching bits are zero in the |
| 1471 | * new tnode's key. |
| 1472 | */ |
| 1473 | |
| 1474 | /* Note: We aren't very concerned about the piece of the key |
| 1475 | * that precede pn->pos+pn->bits, since these have already been |
| 1476 | * checked. The bits after cn->pos aren't checked since these are |
| 1477 | * by definition "unknown" at this point. Thus, what we want to |
| 1478 | * see is if we are about to enter the "prefix matching" state, |
| 1479 | * and in that case verify that the skipped bits that will prevail |
| 1480 | * throughout this subtree are zero, as they have to be if we are |
| 1481 | * to find a matching prefix. |
| 1482 | */ |
| 1483 | |
| 1484 | node_prefix = MASK_PFX(cn->key, cn->pos); |
| 1485 | key_prefix = MASK_PFX(key, cn->pos); |
| 1486 | pref_mismatch = key_prefix^node_prefix; |
| 1487 | mp = 0; |
| 1488 | |
| 1489 | /* In short: If skipped bits in this node do not match the search |
| 1490 | * key, enter the "prefix matching" state.directly. |
| 1491 | */ |
| 1492 | if (pref_mismatch) { |
| 1493 | while (!(pref_mismatch & (1<<(KEYLENGTH-1)))) { |
| 1494 | mp++; |
| 1495 | pref_mismatch = pref_mismatch <<1; |
| 1496 | } |
| 1497 | key_prefix = tkey_extract_bits(cn->key, mp, cn->pos-mp); |
| 1498 | |
| 1499 | if (key_prefix != 0) |
| 1500 | goto backtrace; |
| 1501 | |
| 1502 | if (current_prefix_length >= cn->pos) |
| 1503 | current_prefix_length=mp; |
| 1504 | } |
| 1505 | #endif |
| 1506 | pn = (struct tnode *)n; /* Descend */ |
| 1507 | chopped_off = 0; |
| 1508 | continue; |
| 1509 | } |
| 1510 | if (IS_LEAF(n)) { |
| 1511 | if ((ret = check_leaf(t, (struct leaf *)n, key, &plen, flp, res)) <= 0) |
| 1512 | goto found; |
| 1513 | } |
| 1514 | backtrace: |
| 1515 | chopped_off++; |
| 1516 | |
| 1517 | /* As zero don't change the child key (cindex) */ |
| 1518 | while ((chopped_off <= pn->bits) && !(cindex & (1<<(chopped_off-1)))) { |
| 1519 | chopped_off++; |
| 1520 | } |
| 1521 | |
| 1522 | /* Decrease current_... with bits chopped off */ |
| 1523 | if (current_prefix_length > pn->pos + pn->bits - chopped_off) |
| 1524 | current_prefix_length = pn->pos + pn->bits - chopped_off; |
| 1525 | |
| 1526 | /* |
| 1527 | * Either we do the actual chop off according or if we have |
| 1528 | * chopped off all bits in this tnode walk up to our parent. |
| 1529 | */ |
| 1530 | |
| 1531 | if (chopped_off <= pn->bits) |
| 1532 | cindex &= ~(1 << (chopped_off-1)); |
| 1533 | else { |
| 1534 | if (NODE_PARENT(pn) == NULL) |
| 1535 | goto failed; |
| 1536 | |
| 1537 | /* Get Child's index */ |
| 1538 | cindex = tkey_extract_bits(pn->key, NODE_PARENT(pn)->pos, NODE_PARENT(pn)->bits); |
| 1539 | pn = NODE_PARENT(pn); |
| 1540 | chopped_off = 0; |
| 1541 | |
| 1542 | #ifdef CONFIG_IP_FIB_TRIE_STATS |
| 1543 | t->stats.backtrack++; |
| 1544 | #endif |
| 1545 | goto backtrace; |
| 1546 | } |
| 1547 | } |
| 1548 | failed: |
| 1549 | ret = 1; |
| 1550 | found: |
| 1551 | read_unlock(&fib_lock); |
| 1552 | return ret; |
| 1553 | } |
| 1554 | |
| 1555 | static int trie_leaf_remove(struct trie *t, t_key key) |
| 1556 | { |
| 1557 | t_key cindex; |
| 1558 | struct tnode *tp = NULL; |
| 1559 | struct node *n = t->trie; |
| 1560 | struct leaf *l; |
| 1561 | |
| 1562 | if (trie_debug) |
| 1563 | printk("entering trie_leaf_remove(%p)\n", n); |
| 1564 | |
| 1565 | /* Note that in the case skipped bits, those bits are *not* checked! |
| 1566 | * When we finish this, we will have NULL or a T_LEAF, and the |
| 1567 | * T_LEAF may or may not match our key. |
| 1568 | */ |
| 1569 | |
| 1570 | while (n != NULL && IS_TNODE(n)) { |
| 1571 | struct tnode *tn = (struct tnode *) n; |
| 1572 | check_tnode(tn); |
| 1573 | n = tnode_get_child(tn ,tkey_extract_bits(key, tn->pos, tn->bits)); |
| 1574 | |
| 1575 | if (n && NODE_PARENT(n) != tn) { |
| 1576 | printk("BUG tn=%p, n->parent=%p\n", tn, NODE_PARENT(n)); |
| 1577 | BUG(); |
| 1578 | } |
| 1579 | } |
| 1580 | l = (struct leaf *) n; |
| 1581 | |
| 1582 | if (!n || !tkey_equals(l->key, key)) |
| 1583 | return 0; |
| 1584 | |
| 1585 | /* |
| 1586 | * Key found. |
| 1587 | * Remove the leaf and rebalance the tree |
| 1588 | */ |
| 1589 | |
| 1590 | t->revision++; |
| 1591 | t->size--; |
| 1592 | |
| 1593 | tp = NODE_PARENT(n); |
| 1594 | tnode_free((struct tnode *) n); |
| 1595 | |
| 1596 | if (tp) { |
| 1597 | cindex = tkey_extract_bits(key, tp->pos, tp->bits); |
| 1598 | put_child(t, (struct tnode *)tp, cindex, NULL); |
| 1599 | t->trie = trie_rebalance(t, tp); |
| 1600 | } |
| 1601 | else |
| 1602 | t->trie = NULL; |
| 1603 | |
| 1604 | return 1; |
| 1605 | } |
| 1606 | |
| 1607 | static int |
| 1608 | fn_trie_delete(struct fib_table *tb, struct rtmsg *r, struct kern_rta *rta, |
| 1609 | struct nlmsghdr *nlhdr, struct netlink_skb_parms *req) |
| 1610 | { |
| 1611 | struct trie *t = (struct trie *) tb->tb_data; |
| 1612 | u32 key, mask; |
| 1613 | int plen = r->rtm_dst_len; |
| 1614 | u8 tos = r->rtm_tos; |
| 1615 | struct fib_alias *fa, *fa_to_delete; |
| 1616 | struct list_head *fa_head; |
| 1617 | struct leaf *l; |
| 1618 | |
| 1619 | if (plen > 32) |
| 1620 | return -EINVAL; |
| 1621 | |
| 1622 | key = 0; |
| 1623 | if (rta->rta_dst) |
| 1624 | memcpy(&key, rta->rta_dst, 4); |
| 1625 | |
| 1626 | key = ntohl(key); |
| 1627 | mask = ntohl( inet_make_mask(plen) ); |
| 1628 | |
| 1629 | if (key & ~mask) |
| 1630 | return -EINVAL; |
| 1631 | |
| 1632 | key = key & mask; |
| 1633 | l = fib_find_node(t, key); |
| 1634 | |
| 1635 | if (!l) |
| 1636 | return -ESRCH; |
| 1637 | |
| 1638 | fa_head = get_fa_head(l, plen); |
| 1639 | fa = fib_find_alias(fa_head, tos, 0); |
| 1640 | |
| 1641 | if (!fa) |
| 1642 | return -ESRCH; |
| 1643 | |
| 1644 | if (trie_debug) |
| 1645 | printk("Deleting %08x/%d tos=%d t=%p\n", key, plen, tos, t); |
| 1646 | |
| 1647 | fa_to_delete = NULL; |
| 1648 | fa_head = fa->fa_list.prev; |
| 1649 | list_for_each_entry(fa, fa_head, fa_list) { |
| 1650 | struct fib_info *fi = fa->fa_info; |
| 1651 | |
| 1652 | if (fa->fa_tos != tos) |
| 1653 | break; |
| 1654 | |
| 1655 | if ((!r->rtm_type || |
| 1656 | fa->fa_type == r->rtm_type) && |
| 1657 | (r->rtm_scope == RT_SCOPE_NOWHERE || |
| 1658 | fa->fa_scope == r->rtm_scope) && |
| 1659 | (!r->rtm_protocol || |
| 1660 | fi->fib_protocol == r->rtm_protocol) && |
| 1661 | fib_nh_match(r, nlhdr, rta, fi) == 0) { |
| 1662 | fa_to_delete = fa; |
| 1663 | break; |
| 1664 | } |
| 1665 | } |
| 1666 | |
| 1667 | if (fa_to_delete) { |
| 1668 | int kill_li = 0; |
| 1669 | struct leaf_info *li; |
| 1670 | |
| 1671 | fa = fa_to_delete; |
| 1672 | rtmsg_fib(RTM_DELROUTE, htonl(key), fa, plen, tb->tb_id, nlhdr, req); |
| 1673 | |
| 1674 | l = fib_find_node(t, key); |
| 1675 | li = find_leaf_info(&l->list, plen); |
| 1676 | |
| 1677 | write_lock_bh(&fib_lock); |
| 1678 | |
| 1679 | list_del(&fa->fa_list); |
| 1680 | |
| 1681 | if (list_empty(fa_head)) { |
| 1682 | hlist_del(&li->hlist); |
| 1683 | kill_li = 1; |
| 1684 | } |
| 1685 | write_unlock_bh(&fib_lock); |
| 1686 | |
| 1687 | if (kill_li) |
| 1688 | free_leaf_info(li); |
| 1689 | |
| 1690 | if (hlist_empty(&l->list)) |
| 1691 | trie_leaf_remove(t, key); |
| 1692 | |
| 1693 | if (fa->fa_state & FA_S_ACCESSED) |
| 1694 | rt_cache_flush(-1); |
| 1695 | |
| 1696 | fn_free_alias(fa); |
| 1697 | return 0; |
| 1698 | } |
| 1699 | return -ESRCH; |
| 1700 | } |
| 1701 | |
| 1702 | static int trie_flush_list(struct trie *t, struct list_head *head) |
| 1703 | { |
| 1704 | struct fib_alias *fa, *fa_node; |
| 1705 | int found = 0; |
| 1706 | |
| 1707 | list_for_each_entry_safe(fa, fa_node, head, fa_list) { |
| 1708 | struct fib_info *fi = fa->fa_info; |
| 1709 | |
| 1710 | if (fi && (fi->fib_flags&RTNH_F_DEAD)) { |
| 1711 | |
| 1712 | write_lock_bh(&fib_lock); |
| 1713 | list_del(&fa->fa_list); |
| 1714 | write_unlock_bh(&fib_lock); |
| 1715 | |
| 1716 | fn_free_alias(fa); |
| 1717 | found++; |
| 1718 | } |
| 1719 | } |
| 1720 | return found; |
| 1721 | } |
| 1722 | |
| 1723 | static int trie_flush_leaf(struct trie *t, struct leaf *l) |
| 1724 | { |
| 1725 | int found = 0; |
| 1726 | struct hlist_head *lih = &l->list; |
| 1727 | struct hlist_node *node, *tmp; |
| 1728 | struct leaf_info *li = NULL; |
| 1729 | |
| 1730 | hlist_for_each_entry_safe(li, node, tmp, lih, hlist) { |
| 1731 | |
| 1732 | found += trie_flush_list(t, &li->falh); |
| 1733 | |
| 1734 | if (list_empty(&li->falh)) { |
| 1735 | |
| 1736 | write_lock_bh(&fib_lock); |
| 1737 | hlist_del(&li->hlist); |
| 1738 | write_unlock_bh(&fib_lock); |
| 1739 | |
| 1740 | free_leaf_info(li); |
| 1741 | } |
| 1742 | } |
| 1743 | return found; |
| 1744 | } |
| 1745 | |
| 1746 | static struct leaf *nextleaf(struct trie *t, struct leaf *thisleaf) |
| 1747 | { |
| 1748 | struct node *c = (struct node *) thisleaf; |
| 1749 | struct tnode *p; |
| 1750 | int idx; |
| 1751 | |
| 1752 | if (c == NULL) { |
| 1753 | if (t->trie == NULL) |
| 1754 | return NULL; |
| 1755 | |
| 1756 | if (IS_LEAF(t->trie)) /* trie w. just a leaf */ |
| 1757 | return (struct leaf *) t->trie; |
| 1758 | |
| 1759 | p = (struct tnode*) t->trie; /* Start */ |
| 1760 | } |
| 1761 | else |
| 1762 | p = (struct tnode *) NODE_PARENT(c); |
| 1763 | |
| 1764 | while (p) { |
| 1765 | int pos, last; |
| 1766 | |
| 1767 | /* Find the next child of the parent */ |
| 1768 | if (c) |
| 1769 | pos = 1 + tkey_extract_bits(c->key, p->pos, p->bits); |
| 1770 | else |
| 1771 | pos = 0; |
| 1772 | |
| 1773 | last = 1 << p->bits; |
| 1774 | for(idx = pos; idx < last ; idx++) { |
| 1775 | if (p->child[idx]) { |
| 1776 | |
| 1777 | /* Decend if tnode */ |
| 1778 | |
| 1779 | while (IS_TNODE(p->child[idx])) { |
| 1780 | p = (struct tnode*) p->child[idx]; |
| 1781 | idx = 0; |
| 1782 | |
| 1783 | /* Rightmost non-NULL branch */ |
| 1784 | if (p && IS_TNODE(p)) |
| 1785 | while (p->child[idx] == NULL && idx < (1 << p->bits)) idx++; |
| 1786 | |
| 1787 | /* Done with this tnode? */ |
| 1788 | if (idx >= (1 << p->bits) || p->child[idx] == NULL ) |
| 1789 | goto up; |
| 1790 | } |
| 1791 | return (struct leaf*) p->child[idx]; |
| 1792 | } |
| 1793 | } |
| 1794 | up: |
| 1795 | /* No more children go up one step */ |
| 1796 | c = (struct node*) p; |
| 1797 | p = (struct tnode *) NODE_PARENT(p); |
| 1798 | } |
| 1799 | return NULL; /* Ready. Root of trie */ |
| 1800 | } |
| 1801 | |
| 1802 | static int fn_trie_flush(struct fib_table *tb) |
| 1803 | { |
| 1804 | struct trie *t = (struct trie *) tb->tb_data; |
| 1805 | struct leaf *ll = NULL, *l = NULL; |
| 1806 | int found = 0, h; |
| 1807 | |
| 1808 | t->revision++; |
| 1809 | |
| 1810 | for (h=0; (l = nextleaf(t, l)) != NULL; h++) { |
| 1811 | found += trie_flush_leaf(t, l); |
| 1812 | |
| 1813 | if (ll && hlist_empty(&ll->list)) |
| 1814 | trie_leaf_remove(t, ll->key); |
| 1815 | ll = l; |
| 1816 | } |
| 1817 | |
| 1818 | if (ll && hlist_empty(&ll->list)) |
| 1819 | trie_leaf_remove(t, ll->key); |
| 1820 | |
| 1821 | if (trie_debug) |
| 1822 | printk("trie_flush found=%d\n", found); |
| 1823 | return found; |
| 1824 | } |
| 1825 | |
| 1826 | static int trie_last_dflt=-1; |
| 1827 | |
| 1828 | static void |
| 1829 | fn_trie_select_default(struct fib_table *tb, const struct flowi *flp, struct fib_result *res) |
| 1830 | { |
| 1831 | struct trie *t = (struct trie *) tb->tb_data; |
| 1832 | int order, last_idx; |
| 1833 | struct fib_info *fi = NULL; |
| 1834 | struct fib_info *last_resort; |
| 1835 | struct fib_alias *fa = NULL; |
| 1836 | struct list_head *fa_head; |
| 1837 | struct leaf *l; |
| 1838 | |
| 1839 | last_idx = -1; |
| 1840 | last_resort = NULL; |
| 1841 | order = -1; |
| 1842 | |
| 1843 | read_lock(&fib_lock); |
| 1844 | |
| 1845 | l = fib_find_node(t, 0); |
| 1846 | if (!l) |
| 1847 | goto out; |
| 1848 | |
| 1849 | fa_head = get_fa_head(l, 0); |
| 1850 | if (!fa_head) |
| 1851 | goto out; |
| 1852 | |
| 1853 | if (list_empty(fa_head)) |
| 1854 | goto out; |
| 1855 | |
| 1856 | list_for_each_entry(fa, fa_head, fa_list) { |
| 1857 | struct fib_info *next_fi = fa->fa_info; |
| 1858 | |
| 1859 | if (fa->fa_scope != res->scope || |
| 1860 | fa->fa_type != RTN_UNICAST) |
| 1861 | continue; |
| 1862 | |
| 1863 | if (next_fi->fib_priority > res->fi->fib_priority) |
| 1864 | break; |
| 1865 | if (!next_fi->fib_nh[0].nh_gw || |
| 1866 | next_fi->fib_nh[0].nh_scope != RT_SCOPE_LINK) |
| 1867 | continue; |
| 1868 | fa->fa_state |= FA_S_ACCESSED; |
| 1869 | |
| 1870 | if (fi == NULL) { |
| 1871 | if (next_fi != res->fi) |
| 1872 | break; |
| 1873 | } else if (!fib_detect_death(fi, order, &last_resort, |
| 1874 | &last_idx, &trie_last_dflt)) { |
| 1875 | if (res->fi) |
| 1876 | fib_info_put(res->fi); |
| 1877 | res->fi = fi; |
| 1878 | atomic_inc(&fi->fib_clntref); |
| 1879 | trie_last_dflt = order; |
| 1880 | goto out; |
| 1881 | } |
| 1882 | fi = next_fi; |
| 1883 | order++; |
| 1884 | } |
| 1885 | if (order <= 0 || fi == NULL) { |
| 1886 | trie_last_dflt = -1; |
| 1887 | goto out; |
| 1888 | } |
| 1889 | |
| 1890 | if (!fib_detect_death(fi, order, &last_resort, &last_idx, &trie_last_dflt)) { |
| 1891 | if (res->fi) |
| 1892 | fib_info_put(res->fi); |
| 1893 | res->fi = fi; |
| 1894 | atomic_inc(&fi->fib_clntref); |
| 1895 | trie_last_dflt = order; |
| 1896 | goto out; |
| 1897 | } |
| 1898 | if (last_idx >= 0) { |
| 1899 | if (res->fi) |
| 1900 | fib_info_put(res->fi); |
| 1901 | res->fi = last_resort; |
| 1902 | if (last_resort) |
| 1903 | atomic_inc(&last_resort->fib_clntref); |
| 1904 | } |
| 1905 | trie_last_dflt = last_idx; |
| 1906 | out:; |
| 1907 | read_unlock(&fib_lock); |
| 1908 | } |
| 1909 | |
| 1910 | static int fn_trie_dump_fa(t_key key, int plen, struct list_head *fah, struct fib_table *tb, |
| 1911 | struct sk_buff *skb, struct netlink_callback *cb) |
| 1912 | { |
| 1913 | int i, s_i; |
| 1914 | struct fib_alias *fa; |
| 1915 | |
| 1916 | u32 xkey=htonl(key); |
| 1917 | |
| 1918 | s_i=cb->args[3]; |
| 1919 | i = 0; |
| 1920 | |
| 1921 | list_for_each_entry(fa, fah, fa_list) { |
| 1922 | if (i < s_i) { |
| 1923 | i++; |
| 1924 | continue; |
| 1925 | } |
| 1926 | if (fa->fa_info->fib_nh == NULL) { |
| 1927 | printk("Trie error _fib_nh=NULL in fa[%d] k=%08x plen=%d\n", i, key, plen); |
| 1928 | i++; |
| 1929 | continue; |
| 1930 | } |
| 1931 | if (fa->fa_info == NULL) { |
| 1932 | printk("Trie error fa_info=NULL in fa[%d] k=%08x plen=%d\n", i, key, plen); |
| 1933 | i++; |
| 1934 | continue; |
| 1935 | } |
| 1936 | |
| 1937 | if (fib_dump_info(skb, NETLINK_CB(cb->skb).pid, |
| 1938 | cb->nlh->nlmsg_seq, |
| 1939 | RTM_NEWROUTE, |
| 1940 | tb->tb_id, |
| 1941 | fa->fa_type, |
| 1942 | fa->fa_scope, |
| 1943 | &xkey, |
| 1944 | plen, |
| 1945 | fa->fa_tos, |
| 1946 | fa->fa_info, 0) < 0) { |
| 1947 | cb->args[3] = i; |
| 1948 | return -1; |
| 1949 | } |
| 1950 | i++; |
| 1951 | } |
| 1952 | cb->args[3]=i; |
| 1953 | return skb->len; |
| 1954 | } |
| 1955 | |
| 1956 | static int fn_trie_dump_plen(struct trie *t, int plen, struct fib_table *tb, struct sk_buff *skb, |
| 1957 | struct netlink_callback *cb) |
| 1958 | { |
| 1959 | int h, s_h; |
| 1960 | struct list_head *fa_head; |
| 1961 | struct leaf *l = NULL; |
| 1962 | s_h=cb->args[2]; |
| 1963 | |
| 1964 | for (h=0; (l = nextleaf(t, l)) != NULL; h++) { |
| 1965 | |
| 1966 | if (h < s_h) |
| 1967 | continue; |
| 1968 | if (h > s_h) |
| 1969 | memset(&cb->args[3], 0, |
| 1970 | sizeof(cb->args) - 3*sizeof(cb->args[0])); |
| 1971 | |
| 1972 | fa_head = get_fa_head(l, plen); |
| 1973 | |
| 1974 | if (!fa_head) |
| 1975 | continue; |
| 1976 | |
| 1977 | if (list_empty(fa_head)) |
| 1978 | continue; |
| 1979 | |
| 1980 | if (fn_trie_dump_fa(l->key, plen, fa_head, tb, skb, cb)<0) { |
| 1981 | cb->args[2]=h; |
| 1982 | return -1; |
| 1983 | } |
| 1984 | } |
| 1985 | cb->args[2]=h; |
| 1986 | return skb->len; |
| 1987 | } |
| 1988 | |
| 1989 | static int fn_trie_dump(struct fib_table *tb, struct sk_buff *skb, struct netlink_callback *cb) |
| 1990 | { |
| 1991 | int m, s_m; |
| 1992 | struct trie *t = (struct trie *) tb->tb_data; |
| 1993 | |
| 1994 | s_m = cb->args[1]; |
| 1995 | |
| 1996 | read_lock(&fib_lock); |
| 1997 | for (m=0; m<=32; m++) { |
| 1998 | |
| 1999 | if (m < s_m) |
| 2000 | continue; |
| 2001 | if (m > s_m) |
| 2002 | memset(&cb->args[2], 0, |
| 2003 | sizeof(cb->args) - 2*sizeof(cb->args[0])); |
| 2004 | |
| 2005 | if (fn_trie_dump_plen(t, 32-m, tb, skb, cb)<0) { |
| 2006 | cb->args[1] = m; |
| 2007 | goto out; |
| 2008 | } |
| 2009 | } |
| 2010 | read_unlock(&fib_lock); |
| 2011 | cb->args[1] = m; |
| 2012 | return skb->len; |
| 2013 | out: |
| 2014 | read_unlock(&fib_lock); |
| 2015 | return -1; |
| 2016 | } |
| 2017 | |
| 2018 | /* Fix more generic FIB names for init later */ |
| 2019 | |
| 2020 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
| 2021 | struct fib_table * fib_hash_init(int id) |
| 2022 | #else |
| 2023 | struct fib_table * __init fib_hash_init(int id) |
| 2024 | #endif |
| 2025 | { |
| 2026 | struct fib_table *tb; |
| 2027 | struct trie *t; |
| 2028 | |
| 2029 | if (fn_alias_kmem == NULL) |
| 2030 | fn_alias_kmem = kmem_cache_create("ip_fib_alias", |
| 2031 | sizeof(struct fib_alias), |
| 2032 | 0, SLAB_HWCACHE_ALIGN, |
| 2033 | NULL, NULL); |
| 2034 | |
| 2035 | tb = kmalloc(sizeof(struct fib_table) + sizeof(struct trie), |
| 2036 | GFP_KERNEL); |
| 2037 | if (tb == NULL) |
| 2038 | return NULL; |
| 2039 | |
| 2040 | tb->tb_id = id; |
| 2041 | tb->tb_lookup = fn_trie_lookup; |
| 2042 | tb->tb_insert = fn_trie_insert; |
| 2043 | tb->tb_delete = fn_trie_delete; |
| 2044 | tb->tb_flush = fn_trie_flush; |
| 2045 | tb->tb_select_default = fn_trie_select_default; |
| 2046 | tb->tb_dump = fn_trie_dump; |
| 2047 | memset(tb->tb_data, 0, sizeof(struct trie)); |
| 2048 | |
| 2049 | t = (struct trie *) tb->tb_data; |
| 2050 | |
| 2051 | trie_init(t); |
| 2052 | |
| 2053 | if (id == RT_TABLE_LOCAL) |
| 2054 | trie_local = t; |
| 2055 | else if (id == RT_TABLE_MAIN) |
| 2056 | trie_main = t; |
| 2057 | |
| 2058 | if (id == RT_TABLE_LOCAL) |
| 2059 | printk("IPv4 FIB: Using LC-trie version %s\n", VERSION); |
| 2060 | |
| 2061 | return tb; |
| 2062 | } |
| 2063 | |
| 2064 | /* Trie dump functions */ |
| 2065 | |
| 2066 | static void putspace_seq(struct seq_file *seq, int n) |
| 2067 | { |
| 2068 | while (n--) seq_printf(seq, " "); |
| 2069 | } |
| 2070 | |
| 2071 | static void printbin_seq(struct seq_file *seq, unsigned int v, int bits) |
| 2072 | { |
| 2073 | while (bits--) |
| 2074 | seq_printf(seq, "%s", (v & (1<<bits))?"1":"0"); |
| 2075 | } |
| 2076 | |
| 2077 | static void printnode_seq(struct seq_file *seq, int indent, struct node *n, |
| 2078 | int pend, int cindex, int bits) |
| 2079 | { |
| 2080 | putspace_seq(seq, indent); |
| 2081 | if (IS_LEAF(n)) |
| 2082 | seq_printf(seq, "|"); |
| 2083 | else |
| 2084 | seq_printf(seq, "+"); |
| 2085 | if (bits) { |
| 2086 | seq_printf(seq, "%d/", cindex); |
| 2087 | printbin_seq(seq, cindex, bits); |
| 2088 | seq_printf(seq, ": "); |
| 2089 | } |
| 2090 | else |
| 2091 | seq_printf(seq, "<root>: "); |
| 2092 | seq_printf(seq, "%s:%p ", IS_LEAF(n)?"Leaf":"Internal node", n); |
| 2093 | |
| 2094 | if (IS_LEAF(n)) |
| 2095 | seq_printf(seq, "key=%d.%d.%d.%d\n", |
| 2096 | n->key >> 24, (n->key >> 16) % 256, (n->key >> 8) % 256, n->key % 256); |
| 2097 | else { |
| 2098 | int plen = ((struct tnode *)n)->pos; |
| 2099 | t_key prf=MASK_PFX(n->key, plen); |
| 2100 | seq_printf(seq, "key=%d.%d.%d.%d/%d\n", |
| 2101 | prf >> 24, (prf >> 16) % 256, (prf >> 8) % 256, prf % 256, plen); |
| 2102 | } |
| 2103 | if (IS_LEAF(n)) { |
| 2104 | struct leaf *l=(struct leaf *)n; |
| 2105 | struct fib_alias *fa; |
| 2106 | int i; |
| 2107 | for (i=32; i>=0; i--) |
| 2108 | if (find_leaf_info(&l->list, i)) { |
| 2109 | |
| 2110 | struct list_head *fa_head = get_fa_head(l, i); |
| 2111 | |
| 2112 | if (!fa_head) |
| 2113 | continue; |
| 2114 | |
| 2115 | if (list_empty(fa_head)) |
| 2116 | continue; |
| 2117 | |
| 2118 | putspace_seq(seq, indent+2); |
| 2119 | seq_printf(seq, "{/%d...dumping}\n", i); |
| 2120 | |
| 2121 | |
| 2122 | list_for_each_entry(fa, fa_head, fa_list) { |
| 2123 | putspace_seq(seq, indent+2); |
| 2124 | if (fa->fa_info->fib_nh == NULL) { |
| 2125 | seq_printf(seq, "Error _fib_nh=NULL\n"); |
| 2126 | continue; |
| 2127 | } |
| 2128 | if (fa->fa_info == NULL) { |
| 2129 | seq_printf(seq, "Error fa_info=NULL\n"); |
| 2130 | continue; |
| 2131 | } |
| 2132 | |
| 2133 | seq_printf(seq, "{type=%d scope=%d TOS=%d}\n", |
| 2134 | fa->fa_type, |
| 2135 | fa->fa_scope, |
| 2136 | fa->fa_tos); |
| 2137 | } |
| 2138 | } |
| 2139 | } |
| 2140 | else if (IS_TNODE(n)) { |
| 2141 | struct tnode *tn = (struct tnode *)n; |
| 2142 | putspace_seq(seq, indent); seq_printf(seq, "| "); |
| 2143 | seq_printf(seq, "{key prefix=%08x/", tn->key&TKEY_GET_MASK(0, tn->pos)); |
| 2144 | printbin_seq(seq, tkey_extract_bits(tn->key, 0, tn->pos), tn->pos); |
| 2145 | seq_printf(seq, "}\n"); |
| 2146 | putspace_seq(seq, indent); seq_printf(seq, "| "); |
| 2147 | seq_printf(seq, "{pos=%d", tn->pos); |
| 2148 | seq_printf(seq, " (skip=%d bits)", tn->pos - pend); |
| 2149 | seq_printf(seq, " bits=%d (%u children)}\n", tn->bits, (1 << tn->bits)); |
| 2150 | putspace_seq(seq, indent); seq_printf(seq, "| "); |
| 2151 | seq_printf(seq, "{empty=%d full=%d}\n", tn->empty_children, tn->full_children); |
| 2152 | } |
| 2153 | } |
| 2154 | |
| 2155 | static void trie_dump_seq(struct seq_file *seq, struct trie *t) |
| 2156 | { |
| 2157 | struct node *n = t->trie; |
| 2158 | int cindex=0; |
| 2159 | int indent=1; |
| 2160 | int pend=0; |
| 2161 | int depth = 0; |
| 2162 | |
| 2163 | read_lock(&fib_lock); |
| 2164 | |
| 2165 | seq_printf(seq, "------ trie_dump of t=%p ------\n", t); |
| 2166 | if (n) { |
| 2167 | printnode_seq(seq, indent, n, pend, cindex, 0); |
| 2168 | if (IS_TNODE(n)) { |
| 2169 | struct tnode *tn = (struct tnode *)n; |
| 2170 | pend = tn->pos+tn->bits; |
| 2171 | putspace_seq(seq, indent); seq_printf(seq, "\\--\n"); |
| 2172 | indent += 3; |
| 2173 | depth++; |
| 2174 | |
| 2175 | while (tn && cindex < (1 << tn->bits)) { |
| 2176 | if (tn->child[cindex]) { |
| 2177 | |
| 2178 | /* Got a child */ |
| 2179 | |
| 2180 | printnode_seq(seq, indent, tn->child[cindex], pend, cindex, tn->bits); |
| 2181 | if (IS_LEAF(tn->child[cindex])) { |
| 2182 | cindex++; |
| 2183 | |
| 2184 | } |
| 2185 | else { |
| 2186 | /* |
| 2187 | * New tnode. Decend one level |
| 2188 | */ |
| 2189 | |
| 2190 | depth++; |
| 2191 | n = tn->child[cindex]; |
| 2192 | tn = (struct tnode *)n; |
| 2193 | pend = tn->pos+tn->bits; |
| 2194 | putspace_seq(seq, indent); seq_printf(seq, "\\--\n"); |
| 2195 | indent+=3; |
| 2196 | cindex=0; |
| 2197 | } |
| 2198 | } |
| 2199 | else |
| 2200 | cindex++; |
| 2201 | |
| 2202 | /* |
| 2203 | * Test if we are done |
| 2204 | */ |
| 2205 | |
| 2206 | while (cindex >= (1 << tn->bits)) { |
| 2207 | |
| 2208 | /* |
| 2209 | * Move upwards and test for root |
| 2210 | * pop off all traversed nodes |
| 2211 | */ |
| 2212 | |
| 2213 | if (NODE_PARENT(tn) == NULL) { |
| 2214 | tn = NULL; |
| 2215 | n = NULL; |
| 2216 | break; |
| 2217 | } |
| 2218 | else { |
| 2219 | cindex = tkey_extract_bits(tn->key, NODE_PARENT(tn)->pos, NODE_PARENT(tn)->bits); |
| 2220 | tn = NODE_PARENT(tn); |
| 2221 | cindex++; |
| 2222 | n = (struct node *)tn; |
| 2223 | pend = tn->pos+tn->bits; |
| 2224 | indent-=3; |
| 2225 | depth--; |
| 2226 | } |
| 2227 | } |
| 2228 | } |
| 2229 | } |
| 2230 | else n = NULL; |
| 2231 | } |
| 2232 | else seq_printf(seq, "------ trie is empty\n"); |
| 2233 | |
| 2234 | read_unlock(&fib_lock); |
| 2235 | } |
| 2236 | |
| 2237 | static struct trie_stat *trie_stat_new(void) |
| 2238 | { |
| 2239 | struct trie_stat *s = kmalloc(sizeof(struct trie_stat), GFP_KERNEL); |
| 2240 | int i; |
| 2241 | |
| 2242 | if (s) { |
| 2243 | s->totdepth = 0; |
| 2244 | s->maxdepth = 0; |
| 2245 | s->tnodes = 0; |
| 2246 | s->leaves = 0; |
| 2247 | s->nullpointers = 0; |
| 2248 | |
| 2249 | for(i=0; i< MAX_CHILDS; i++) |
| 2250 | s->nodesizes[i] = 0; |
| 2251 | } |
| 2252 | return s; |
| 2253 | } |
| 2254 | |
| 2255 | static struct trie_stat *trie_collect_stats(struct trie *t) |
| 2256 | { |
| 2257 | struct node *n = t->trie; |
| 2258 | struct trie_stat *s = trie_stat_new(); |
| 2259 | int cindex = 0; |
| 2260 | int indent = 1; |
| 2261 | int pend = 0; |
| 2262 | int depth = 0; |
| 2263 | |
| 2264 | read_lock(&fib_lock); |
| 2265 | |
| 2266 | if (s) { |
| 2267 | if (n) { |
| 2268 | if (IS_TNODE(n)) { |
| 2269 | struct tnode *tn = (struct tnode *)n; |
| 2270 | pend = tn->pos+tn->bits; |
| 2271 | indent += 3; |
| 2272 | s->nodesizes[tn->bits]++; |
| 2273 | depth++; |
| 2274 | |
| 2275 | while (tn && cindex < (1 << tn->bits)) { |
| 2276 | if (tn->child[cindex]) { |
| 2277 | /* Got a child */ |
| 2278 | |
| 2279 | if (IS_LEAF(tn->child[cindex])) { |
| 2280 | cindex++; |
| 2281 | |
| 2282 | /* stats */ |
| 2283 | if (depth > s->maxdepth) |
| 2284 | s->maxdepth = depth; |
| 2285 | s->totdepth += depth; |
| 2286 | s->leaves++; |
| 2287 | } |
| 2288 | |
| 2289 | else { |
| 2290 | /* |
| 2291 | * New tnode. Decend one level |
| 2292 | */ |
| 2293 | |
| 2294 | s->tnodes++; |
| 2295 | s->nodesizes[tn->bits]++; |
| 2296 | depth++; |
| 2297 | |
| 2298 | n = tn->child[cindex]; |
| 2299 | tn = (struct tnode *)n; |
| 2300 | pend = tn->pos+tn->bits; |
| 2301 | |
| 2302 | indent += 3; |
| 2303 | cindex = 0; |
| 2304 | } |
| 2305 | } |
| 2306 | else { |
| 2307 | cindex++; |
| 2308 | s->nullpointers++; |
| 2309 | } |
| 2310 | |
| 2311 | /* |
| 2312 | * Test if we are done |
| 2313 | */ |
| 2314 | |
| 2315 | while (cindex >= (1 << tn->bits)) { |
| 2316 | |
| 2317 | /* |
| 2318 | * Move upwards and test for root |
| 2319 | * pop off all traversed nodes |
| 2320 | */ |
| 2321 | |
| 2322 | |
| 2323 | if (NODE_PARENT(tn) == NULL) { |
| 2324 | tn = NULL; |
| 2325 | n = NULL; |
| 2326 | break; |
| 2327 | } |
| 2328 | else { |
| 2329 | cindex = tkey_extract_bits(tn->key, NODE_PARENT(tn)->pos, NODE_PARENT(tn)->bits); |
| 2330 | tn = NODE_PARENT(tn); |
| 2331 | cindex++; |
| 2332 | n = (struct node *)tn; |
| 2333 | pend = tn->pos+tn->bits; |
| 2334 | indent -= 3; |
| 2335 | depth--; |
| 2336 | } |
| 2337 | } |
| 2338 | } |
| 2339 | } |
| 2340 | else n = NULL; |
| 2341 | } |
| 2342 | } |
| 2343 | |
| 2344 | read_unlock(&fib_lock); |
| 2345 | return s; |
| 2346 | } |
| 2347 | |
| 2348 | #ifdef CONFIG_PROC_FS |
| 2349 | |
| 2350 | static struct fib_alias *fib_triestat_get_first(struct seq_file *seq) |
| 2351 | { |
| 2352 | return NULL; |
| 2353 | } |
| 2354 | |
| 2355 | static struct fib_alias *fib_triestat_get_next(struct seq_file *seq) |
| 2356 | { |
| 2357 | return NULL; |
| 2358 | } |
| 2359 | |
| 2360 | static void *fib_triestat_seq_start(struct seq_file *seq, loff_t *pos) |
| 2361 | { |
| 2362 | void *v = NULL; |
| 2363 | |
| 2364 | if (ip_fib_main_table) |
| 2365 | v = *pos ? fib_triestat_get_next(seq) : SEQ_START_TOKEN; |
| 2366 | return v; |
| 2367 | } |
| 2368 | |
| 2369 | static void *fib_triestat_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 2370 | { |
| 2371 | ++*pos; |
| 2372 | return v == SEQ_START_TOKEN ? fib_triestat_get_first(seq) : fib_triestat_get_next(seq); |
| 2373 | } |
| 2374 | |
| 2375 | static void fib_triestat_seq_stop(struct seq_file *seq, void *v) |
| 2376 | { |
| 2377 | |
| 2378 | } |
| 2379 | |
| 2380 | /* |
| 2381 | * This outputs /proc/net/fib_triestats |
| 2382 | * |
| 2383 | * It always works in backward compatibility mode. |
| 2384 | * The format of the file is not supposed to be changed. |
| 2385 | */ |
| 2386 | |
| 2387 | static void collect_and_show(struct trie *t, struct seq_file *seq) |
| 2388 | { |
| 2389 | int bytes = 0; /* How many bytes are used, a ref is 4 bytes */ |
| 2390 | int i, max, pointers; |
| 2391 | struct trie_stat *stat; |
| 2392 | int avdepth; |
| 2393 | |
| 2394 | stat = trie_collect_stats(t); |
| 2395 | |
| 2396 | bytes=0; |
| 2397 | seq_printf(seq, "trie=%p\n", t); |
| 2398 | |
| 2399 | if (stat) { |
| 2400 | if (stat->leaves) |
| 2401 | avdepth=stat->totdepth*100 / stat->leaves; |
| 2402 | else |
| 2403 | avdepth=0; |
| 2404 | seq_printf(seq, "Aver depth: %d.%02d\n", avdepth / 100, avdepth % 100 ); |
| 2405 | seq_printf(seq, "Max depth: %4d\n", stat->maxdepth); |
| 2406 | |
| 2407 | seq_printf(seq, "Leaves: %d\n", stat->leaves); |
| 2408 | bytes += sizeof(struct leaf) * stat->leaves; |
| 2409 | seq_printf(seq, "Internal nodes: %d\n", stat->tnodes); |
| 2410 | bytes += sizeof(struct tnode) * stat->tnodes; |
| 2411 | |
| 2412 | max = MAX_CHILDS-1; |
| 2413 | |
| 2414 | while (max >= 0 && stat->nodesizes[max] == 0) |
| 2415 | max--; |
| 2416 | pointers = 0; |
| 2417 | |
| 2418 | for (i = 1; i <= max; i++) |
| 2419 | if (stat->nodesizes[i] != 0) { |
| 2420 | seq_printf(seq, " %d: %d", i, stat->nodesizes[i]); |
| 2421 | pointers += (1<<i) * stat->nodesizes[i]; |
| 2422 | } |
| 2423 | seq_printf(seq, "\n"); |
| 2424 | seq_printf(seq, "Pointers: %d\n", pointers); |
| 2425 | bytes += sizeof(struct node *) * pointers; |
| 2426 | seq_printf(seq, "Null ptrs: %d\n", stat->nullpointers); |
| 2427 | seq_printf(seq, "Total size: %d kB\n", bytes / 1024); |
| 2428 | |
| 2429 | kfree(stat); |
| 2430 | } |
| 2431 | |
| 2432 | #ifdef CONFIG_IP_FIB_TRIE_STATS |
| 2433 | seq_printf(seq, "Counters:\n---------\n"); |
| 2434 | seq_printf(seq,"gets = %d\n", t->stats.gets); |
| 2435 | seq_printf(seq,"backtracks = %d\n", t->stats.backtrack); |
| 2436 | seq_printf(seq,"semantic match passed = %d\n", t->stats.semantic_match_passed); |
| 2437 | seq_printf(seq,"semantic match miss = %d\n", t->stats.semantic_match_miss); |
| 2438 | seq_printf(seq,"null node hit= %d\n", t->stats.null_node_hit); |
| 2439 | seq_printf(seq,"skipped node resize = %d\n", t->stats.resize_node_skipped); |
| 2440 | #ifdef CLEAR_STATS |
| 2441 | memset(&(t->stats), 0, sizeof(t->stats)); |
| 2442 | #endif |
| 2443 | #endif /* CONFIG_IP_FIB_TRIE_STATS */ |
| 2444 | } |
| 2445 | |
| 2446 | static int fib_triestat_seq_show(struct seq_file *seq, void *v) |
| 2447 | { |
| 2448 | char bf[128]; |
| 2449 | |
| 2450 | if (v == SEQ_START_TOKEN) { |
| 2451 | seq_printf(seq, "Basic info: size of leaf: %Zd bytes, size of tnode: %Zd bytes.\n", |
| 2452 | sizeof(struct leaf), sizeof(struct tnode)); |
| 2453 | if (trie_local) |
| 2454 | collect_and_show(trie_local, seq); |
| 2455 | |
| 2456 | if (trie_main) |
| 2457 | collect_and_show(trie_main, seq); |
| 2458 | } |
| 2459 | else { |
| 2460 | snprintf(bf, sizeof(bf), |
| 2461 | "*\t%08X\t%08X", 200, 400); |
| 2462 | |
| 2463 | seq_printf(seq, "%-127s\n", bf); |
| 2464 | } |
| 2465 | return 0; |
| 2466 | } |
| 2467 | |
| 2468 | static struct seq_operations fib_triestat_seq_ops = { |
| 2469 | .start = fib_triestat_seq_start, |
| 2470 | .next = fib_triestat_seq_next, |
| 2471 | .stop = fib_triestat_seq_stop, |
| 2472 | .show = fib_triestat_seq_show, |
| 2473 | }; |
| 2474 | |
| 2475 | static int fib_triestat_seq_open(struct inode *inode, struct file *file) |
| 2476 | { |
| 2477 | struct seq_file *seq; |
| 2478 | int rc = -ENOMEM; |
| 2479 | |
| 2480 | rc = seq_open(file, &fib_triestat_seq_ops); |
| 2481 | if (rc) |
| 2482 | goto out_kfree; |
| 2483 | |
| 2484 | seq = file->private_data; |
| 2485 | out: |
| 2486 | return rc; |
| 2487 | out_kfree: |
| 2488 | goto out; |
| 2489 | } |
| 2490 | |
| 2491 | static struct file_operations fib_triestat_seq_fops = { |
| 2492 | .owner = THIS_MODULE, |
| 2493 | .open = fib_triestat_seq_open, |
| 2494 | .read = seq_read, |
| 2495 | .llseek = seq_lseek, |
| 2496 | .release = seq_release_private, |
| 2497 | }; |
| 2498 | |
| 2499 | int __init fib_stat_proc_init(void) |
| 2500 | { |
| 2501 | if (!proc_net_fops_create("fib_triestat", S_IRUGO, &fib_triestat_seq_fops)) |
| 2502 | return -ENOMEM; |
| 2503 | return 0; |
| 2504 | } |
| 2505 | |
| 2506 | void __init fib_stat_proc_exit(void) |
| 2507 | { |
| 2508 | proc_net_remove("fib_triestat"); |
| 2509 | } |
| 2510 | |
| 2511 | static struct fib_alias *fib_trie_get_first(struct seq_file *seq) |
| 2512 | { |
| 2513 | return NULL; |
| 2514 | } |
| 2515 | |
| 2516 | static struct fib_alias *fib_trie_get_next(struct seq_file *seq) |
| 2517 | { |
| 2518 | return NULL; |
| 2519 | } |
| 2520 | |
| 2521 | static void *fib_trie_seq_start(struct seq_file *seq, loff_t *pos) |
| 2522 | { |
| 2523 | void *v = NULL; |
| 2524 | |
| 2525 | if (ip_fib_main_table) |
| 2526 | v = *pos ? fib_trie_get_next(seq) : SEQ_START_TOKEN; |
| 2527 | return v; |
| 2528 | } |
| 2529 | |
| 2530 | static void *fib_trie_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 2531 | { |
| 2532 | ++*pos; |
| 2533 | return v == SEQ_START_TOKEN ? fib_trie_get_first(seq) : fib_trie_get_next(seq); |
| 2534 | } |
| 2535 | |
| 2536 | static void fib_trie_seq_stop(struct seq_file *seq, void *v) |
| 2537 | { |
| 2538 | |
| 2539 | } |
| 2540 | |
| 2541 | /* |
| 2542 | * This outputs /proc/net/fib_trie. |
| 2543 | * |
| 2544 | * It always works in backward compatibility mode. |
| 2545 | * The format of the file is not supposed to be changed. |
| 2546 | */ |
| 2547 | |
| 2548 | static int fib_trie_seq_show(struct seq_file *seq, void *v) |
| 2549 | { |
| 2550 | char bf[128]; |
| 2551 | |
| 2552 | if (v == SEQ_START_TOKEN) { |
| 2553 | if (trie_local) |
| 2554 | trie_dump_seq(seq, trie_local); |
| 2555 | |
| 2556 | if (trie_main) |
| 2557 | trie_dump_seq(seq, trie_main); |
| 2558 | } |
| 2559 | |
| 2560 | else { |
| 2561 | snprintf(bf, sizeof(bf), |
| 2562 | "*\t%08X\t%08X", 200, 400); |
| 2563 | seq_printf(seq, "%-127s\n", bf); |
| 2564 | } |
| 2565 | |
| 2566 | return 0; |
| 2567 | } |
| 2568 | |
| 2569 | static struct seq_operations fib_trie_seq_ops = { |
| 2570 | .start = fib_trie_seq_start, |
| 2571 | .next = fib_trie_seq_next, |
| 2572 | .stop = fib_trie_seq_stop, |
| 2573 | .show = fib_trie_seq_show, |
| 2574 | }; |
| 2575 | |
| 2576 | static int fib_trie_seq_open(struct inode *inode, struct file *file) |
| 2577 | { |
| 2578 | struct seq_file *seq; |
| 2579 | int rc = -ENOMEM; |
| 2580 | |
| 2581 | rc = seq_open(file, &fib_trie_seq_ops); |
| 2582 | if (rc) |
| 2583 | goto out_kfree; |
| 2584 | |
| 2585 | seq = file->private_data; |
| 2586 | out: |
| 2587 | return rc; |
| 2588 | out_kfree: |
| 2589 | goto out; |
| 2590 | } |
| 2591 | |
| 2592 | static struct file_operations fib_trie_seq_fops = { |
| 2593 | .owner = THIS_MODULE, |
| 2594 | .open = fib_trie_seq_open, |
| 2595 | .read = seq_read, |
| 2596 | .llseek = seq_lseek, |
| 2597 | .release= seq_release_private, |
| 2598 | }; |
| 2599 | |
| 2600 | int __init fib_proc_init(void) |
| 2601 | { |
| 2602 | if (!proc_net_fops_create("fib_trie", S_IRUGO, &fib_trie_seq_fops)) |
| 2603 | return -ENOMEM; |
| 2604 | return 0; |
| 2605 | } |
| 2606 | |
| 2607 | void __init fib_proc_exit(void) |
| 2608 | { |
| 2609 | proc_net_remove("fib_trie"); |
| 2610 | } |
| 2611 | |
| 2612 | #endif /* CONFIG_PROC_FS */ |