Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 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 | * |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 10 | * Jens Laas <jens.laas@data.slu.se> Swedish University of |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 11 | * Agricultural Sciences. |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 12 | * |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 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: |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 16 | * |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 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. |
Robert Olsson | fd96625 | 2005-12-22 11:25:10 -0800 | [diff] [blame] | 44 | * |
| 45 | * Substantial contributions to this work comes from: |
| 46 | * |
| 47 | * David S. Miller, <davem@davemloft.net> |
| 48 | * Stephen Hemminger <shemminger@osdl.org> |
| 49 | * Paul E. McKenney <paulmck@us.ibm.com> |
| 50 | * Patrick McHardy <kaber@trash.net> |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 51 | */ |
| 52 | |
Robert Olsson | 05eee48 | 2007-03-19 16:27:37 -0700 | [diff] [blame] | 53 | #define VERSION "0.408" |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 54 | |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 55 | #include <asm/uaccess.h> |
| 56 | #include <asm/system.h> |
| 57 | #include <asm/bitops.h> |
| 58 | #include <linux/types.h> |
| 59 | #include <linux/kernel.h> |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 60 | #include <linux/mm.h> |
| 61 | #include <linux/string.h> |
| 62 | #include <linux/socket.h> |
| 63 | #include <linux/sockios.h> |
| 64 | #include <linux/errno.h> |
| 65 | #include <linux/in.h> |
| 66 | #include <linux/inet.h> |
Stephen Hemminger | cd8787a | 2006-01-03 14:38:34 -0800 | [diff] [blame] | 67 | #include <linux/inetdevice.h> |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 68 | #include <linux/netdevice.h> |
| 69 | #include <linux/if_arp.h> |
| 70 | #include <linux/proc_fs.h> |
Robert Olsson | 2373ce1 | 2005-08-25 13:01:29 -0700 | [diff] [blame] | 71 | #include <linux/rcupdate.h> |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 72 | #include <linux/skbuff.h> |
| 73 | #include <linux/netlink.h> |
| 74 | #include <linux/init.h> |
| 75 | #include <linux/list.h> |
| 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 | |
| 84 | #undef CONFIG_IP_FIB_TRIE_STATS |
Robert Olsson | 06ef921 | 2006-03-20 21:35:01 -0800 | [diff] [blame] | 85 | #define MAX_STAT_DEPTH 32 |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 86 | |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 87 | #define KEYLENGTH (8*sizeof(t_key)) |
| 88 | #define MASK_PFX(k, l) (((l)==0)?0:(k >> (KEYLENGTH-l)) << (KEYLENGTH-l)) |
| 89 | #define TKEY_GET_MASK(offset, bits) (((bits)==0)?0:((t_key)(-1) << (KEYLENGTH - bits) >> offset)) |
| 90 | |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 91 | typedef unsigned int t_key; |
| 92 | |
| 93 | #define T_TNODE 0 |
| 94 | #define T_LEAF 1 |
| 95 | #define NODE_TYPE_MASK 0x1UL |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 96 | #define NODE_PARENT(node) \ |
Robert Olsson | 2373ce1 | 2005-08-25 13:01:29 -0700 | [diff] [blame] | 97 | ((struct tnode *)rcu_dereference(((node)->parent & ~NODE_TYPE_MASK))) |
| 98 | |
| 99 | #define NODE_TYPE(node) ((node)->parent & NODE_TYPE_MASK) |
| 100 | |
| 101 | #define NODE_SET_PARENT(node, ptr) \ |
| 102 | rcu_assign_pointer((node)->parent, \ |
| 103 | ((unsigned long)(ptr)) | NODE_TYPE(node)) |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 104 | |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 105 | #define IS_TNODE(n) (!(n->parent & T_LEAF)) |
| 106 | #define IS_LEAF(n) (n->parent & T_LEAF) |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 107 | |
| 108 | struct node { |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 109 | t_key key; |
| 110 | unsigned long parent; |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 111 | }; |
| 112 | |
| 113 | struct leaf { |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 114 | t_key key; |
| 115 | unsigned long parent; |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 116 | struct hlist_head list; |
Robert Olsson | 2373ce1 | 2005-08-25 13:01:29 -0700 | [diff] [blame] | 117 | struct rcu_head rcu; |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 118 | }; |
| 119 | |
| 120 | struct leaf_info { |
| 121 | struct hlist_node hlist; |
Robert Olsson | 2373ce1 | 2005-08-25 13:01:29 -0700 | [diff] [blame] | 122 | struct rcu_head rcu; |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 123 | int plen; |
| 124 | struct list_head falh; |
| 125 | }; |
| 126 | |
| 127 | struct tnode { |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 128 | t_key key; |
| 129 | unsigned long parent; |
| 130 | unsigned short pos:5; /* 2log(KEYLENGTH) bits needed */ |
| 131 | unsigned short bits:5; /* 2log(KEYLENGTH) bits needed */ |
| 132 | unsigned short full_children; /* KEYLENGTH bits needed */ |
| 133 | unsigned short empty_children; /* KEYLENGTH bits needed */ |
Robert Olsson | 2373ce1 | 2005-08-25 13:01:29 -0700 | [diff] [blame] | 134 | struct rcu_head rcu; |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 135 | struct node *child[0]; |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 136 | }; |
| 137 | |
| 138 | #ifdef CONFIG_IP_FIB_TRIE_STATS |
| 139 | struct trie_use_stats { |
| 140 | unsigned int gets; |
| 141 | unsigned int backtrack; |
| 142 | unsigned int semantic_match_passed; |
| 143 | unsigned int semantic_match_miss; |
| 144 | unsigned int null_node_hit; |
Robert Olsson | 2f36895 | 2005-07-05 15:02:40 -0700 | [diff] [blame] | 145 | unsigned int resize_node_skipped; |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 146 | }; |
| 147 | #endif |
| 148 | |
| 149 | struct trie_stat { |
| 150 | unsigned int totdepth; |
| 151 | unsigned int maxdepth; |
| 152 | unsigned int tnodes; |
| 153 | unsigned int leaves; |
| 154 | unsigned int nullpointers; |
Robert Olsson | 06ef921 | 2006-03-20 21:35:01 -0800 | [diff] [blame] | 155 | unsigned int nodesizes[MAX_STAT_DEPTH]; |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 156 | }; |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 157 | |
| 158 | struct trie { |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 159 | struct node *trie; |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 160 | #ifdef CONFIG_IP_FIB_TRIE_STATS |
| 161 | struct trie_use_stats stats; |
| 162 | #endif |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 163 | int size; |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 164 | unsigned int revision; |
| 165 | }; |
| 166 | |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 167 | static void put_child(struct trie *t, struct tnode *tn, int i, struct node *n); |
| 168 | static void tnode_put_child_reorg(struct tnode *tn, int i, struct node *n, int wasfull); |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 169 | static struct node *resize(struct trie *t, struct tnode *tn); |
Robert Olsson | 2f80b3c | 2005-08-09 20:25:06 -0700 | [diff] [blame] | 170 | static struct tnode *inflate(struct trie *t, struct tnode *tn); |
| 171 | static struct tnode *halve(struct trie *t, struct tnode *tn); |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 172 | static void tnode_free(struct tnode *tn); |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 173 | |
Christoph Lameter | e18b890 | 2006-12-06 20:33:20 -0800 | [diff] [blame] | 174 | static struct kmem_cache *fn_alias_kmem __read_mostly; |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 175 | static struct trie *trie_local = NULL, *trie_main = NULL; |
| 176 | |
Robert Olsson | 2373ce1 | 2005-08-25 13:01:29 -0700 | [diff] [blame] | 177 | |
| 178 | /* rcu_read_lock needs to be hold by caller from readside */ |
| 179 | |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 180 | static inline struct node *tnode_get_child(struct tnode *tn, int i) |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 181 | { |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 182 | BUG_ON(i >= 1 << tn->bits); |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 183 | |
Robert Olsson | 2373ce1 | 2005-08-25 13:01:29 -0700 | [diff] [blame] | 184 | return rcu_dereference(tn->child[i]); |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 185 | } |
| 186 | |
Stephen Hemmigner | bb435b8 | 2005-08-09 20:25:39 -0700 | [diff] [blame] | 187 | static inline int tnode_child_length(const struct tnode *tn) |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 188 | { |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 189 | return 1 << tn->bits; |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 190 | } |
| 191 | |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 192 | static inline t_key tkey_extract_bits(t_key a, int offset, int bits) |
| 193 | { |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 194 | if (offset < KEYLENGTH) |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 195 | return ((t_key)(a << offset)) >> (KEYLENGTH - bits); |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 196 | else |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 197 | return 0; |
| 198 | } |
| 199 | |
| 200 | static inline int tkey_equals(t_key a, t_key b) |
| 201 | { |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 202 | return a == b; |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 203 | } |
| 204 | |
| 205 | static inline int tkey_sub_equals(t_key a, int offset, int bits, t_key b) |
| 206 | { |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 207 | if (bits == 0 || offset >= KEYLENGTH) |
| 208 | return 1; |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 209 | bits = bits > KEYLENGTH ? KEYLENGTH : bits; |
| 210 | return ((a ^ b) << offset) >> (KEYLENGTH - bits) == 0; |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 211 | } |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 212 | |
| 213 | static inline int tkey_mismatch(t_key a, int offset, t_key b) |
| 214 | { |
| 215 | t_key diff = a ^ b; |
| 216 | int i = offset; |
| 217 | |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 218 | if (!diff) |
| 219 | return 0; |
| 220 | while ((diff << i) >> (KEYLENGTH-1) == 0) |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 221 | i++; |
| 222 | return i; |
| 223 | } |
| 224 | |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 225 | /* |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 226 | To understand this stuff, an understanding of keys and all their bits is |
| 227 | necessary. Every node in the trie has a key associated with it, but not |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 228 | all of the bits in that key are significant. |
| 229 | |
| 230 | Consider a node 'n' and its parent 'tp'. |
| 231 | |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 232 | If n is a leaf, every bit in its key is significant. Its presence is |
| 233 | necessitated by path compression, since during a tree traversal (when |
| 234 | searching for a leaf - unless we are doing an insertion) we will completely |
| 235 | ignore all skipped bits we encounter. Thus we need to verify, at the end of |
| 236 | a potentially successful search, that we have indeed been walking the |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 237 | correct key path. |
| 238 | |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 239 | Note that we can never "miss" the correct key in the tree if present by |
| 240 | following the wrong path. Path compression ensures that segments of the key |
| 241 | that are the same for all keys with a given prefix are skipped, but the |
| 242 | skipped part *is* identical for each node in the subtrie below the skipped |
| 243 | bit! trie_insert() in this implementation takes care of that - note the |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 244 | call to tkey_sub_equals() in trie_insert(). |
| 245 | |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 246 | if n is an internal node - a 'tnode' here, the various parts of its key |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 247 | have many different meanings. |
| 248 | |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 249 | Example: |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 250 | _________________________________________________________________ |
| 251 | | i | i | i | i | i | i | i | N | N | N | S | S | S | S | S | C | |
| 252 | ----------------------------------------------------------------- |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 253 | 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 254 | |
| 255 | _________________________________________________________________ |
| 256 | | C | C | C | u | u | u | u | u | u | u | u | u | u | u | u | u | |
| 257 | ----------------------------------------------------------------- |
| 258 | 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 |
| 259 | |
| 260 | tp->pos = 7 |
| 261 | tp->bits = 3 |
| 262 | n->pos = 15 |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 263 | n->bits = 4 |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 264 | |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 265 | First, let's just ignore the bits that come before the parent tp, that is |
| 266 | the bits from 0 to (tp->pos-1). They are *known* but at this point we do |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 267 | not use them for anything. |
| 268 | |
| 269 | The bits from (tp->pos) to (tp->pos + tp->bits - 1) - "N", above - are the |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 270 | index into the parent's child array. That is, they will be used to find |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 271 | 'n' among tp's children. |
| 272 | |
| 273 | The bits from (tp->pos + tp->bits) to (n->pos - 1) - "S" - are skipped bits |
| 274 | for the node n. |
| 275 | |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 276 | All the bits we have seen so far are significant to the node n. The rest |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 277 | of the bits are really not needed or indeed known in n->key. |
| 278 | |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 279 | The bits from (n->pos) to (n->pos + n->bits - 1) - "C" - are the index into |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 280 | n's child array, and will of course be different for each child. |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 281 | |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 282 | |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 283 | The rest of the bits, from (n->pos + n->bits) onward, are completely unknown |
| 284 | at this point. |
| 285 | |
| 286 | */ |
| 287 | |
Stephen Hemminger | 0c7770c | 2005-08-23 21:59:41 -0700 | [diff] [blame] | 288 | static inline void check_tnode(const struct tnode *tn) |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 289 | { |
Stephen Hemminger | 0c7770c | 2005-08-23 21:59:41 -0700 | [diff] [blame] | 290 | WARN_ON(tn && tn->pos+tn->bits > 32); |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 291 | } |
| 292 | |
| 293 | static int halve_threshold = 25; |
| 294 | static int inflate_threshold = 50; |
Robert Olsson | 965ffea | 2007-03-19 16:29:58 -0700 | [diff] [blame] | 295 | static int halve_threshold_root = 8; |
| 296 | static int inflate_threshold_root = 15; |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 297 | |
Robert Olsson | 2373ce1 | 2005-08-25 13:01:29 -0700 | [diff] [blame] | 298 | |
| 299 | static void __alias_free_mem(struct rcu_head *head) |
| 300 | { |
| 301 | struct fib_alias *fa = container_of(head, struct fib_alias, rcu); |
| 302 | kmem_cache_free(fn_alias_kmem, fa); |
| 303 | } |
| 304 | |
| 305 | static inline void alias_free_mem_rcu(struct fib_alias *fa) |
| 306 | { |
| 307 | call_rcu(&fa->rcu, __alias_free_mem); |
| 308 | } |
| 309 | |
| 310 | static void __leaf_free_rcu(struct rcu_head *head) |
| 311 | { |
| 312 | kfree(container_of(head, struct leaf, rcu)); |
| 313 | } |
| 314 | |
Robert Olsson | 2373ce1 | 2005-08-25 13:01:29 -0700 | [diff] [blame] | 315 | static void __leaf_info_free_rcu(struct rcu_head *head) |
| 316 | { |
| 317 | kfree(container_of(head, struct leaf_info, rcu)); |
| 318 | } |
| 319 | |
| 320 | static inline void free_leaf_info(struct leaf_info *leaf) |
| 321 | { |
| 322 | call_rcu(&leaf->rcu, __leaf_info_free_rcu); |
| 323 | } |
| 324 | |
| 325 | static struct tnode *tnode_alloc(unsigned int size) |
| 326 | { |
| 327 | struct page *pages; |
| 328 | |
| 329 | if (size <= PAGE_SIZE) |
| 330 | return kcalloc(size, 1, GFP_KERNEL); |
| 331 | |
| 332 | pages = alloc_pages(GFP_KERNEL|__GFP_ZERO, get_order(size)); |
| 333 | if (!pages) |
| 334 | return NULL; |
| 335 | |
| 336 | return page_address(pages); |
| 337 | } |
| 338 | |
| 339 | static void __tnode_free_rcu(struct rcu_head *head) |
| 340 | { |
| 341 | struct tnode *tn = container_of(head, struct tnode, rcu); |
| 342 | unsigned int size = sizeof(struct tnode) + |
| 343 | (1 << tn->bits) * sizeof(struct node *); |
| 344 | |
| 345 | if (size <= PAGE_SIZE) |
| 346 | kfree(tn); |
| 347 | else |
| 348 | free_pages((unsigned long)tn, get_order(size)); |
| 349 | } |
| 350 | |
| 351 | static inline void tnode_free(struct tnode *tn) |
| 352 | { |
Stephen Hemminger | 132adf5 | 2007-03-08 20:44:43 -0800 | [diff] [blame] | 353 | if (IS_LEAF(tn)) { |
Robert Olsson | 550e29b | 2006-04-04 12:53:35 -0700 | [diff] [blame] | 354 | struct leaf *l = (struct leaf *) tn; |
| 355 | call_rcu_bh(&l->rcu, __leaf_free_rcu); |
Stephen Hemminger | 132adf5 | 2007-03-08 20:44:43 -0800 | [diff] [blame] | 356 | } else |
Robert Olsson | 550e29b | 2006-04-04 12:53:35 -0700 | [diff] [blame] | 357 | call_rcu(&tn->rcu, __tnode_free_rcu); |
Robert Olsson | 2373ce1 | 2005-08-25 13:01:29 -0700 | [diff] [blame] | 358 | } |
| 359 | |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 360 | static struct leaf *leaf_new(void) |
| 361 | { |
| 362 | struct leaf *l = kmalloc(sizeof(struct leaf), GFP_KERNEL); |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 363 | if (l) { |
Robert Olsson | 2373ce1 | 2005-08-25 13:01:29 -0700 | [diff] [blame] | 364 | l->parent = T_LEAF; |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 365 | INIT_HLIST_HEAD(&l->list); |
| 366 | } |
| 367 | return l; |
| 368 | } |
| 369 | |
| 370 | static struct leaf_info *leaf_info_new(int plen) |
| 371 | { |
| 372 | struct leaf_info *li = kmalloc(sizeof(struct leaf_info), GFP_KERNEL); |
Robert Olsson | 2373ce1 | 2005-08-25 13:01:29 -0700 | [diff] [blame] | 373 | if (li) { |
| 374 | li->plen = plen; |
| 375 | INIT_LIST_HEAD(&li->falh); |
Patrick McHardy | f0e36f8 | 2005-07-05 14:44:55 -0700 | [diff] [blame] | 376 | } |
Robert Olsson | 2373ce1 | 2005-08-25 13:01:29 -0700 | [diff] [blame] | 377 | return li; |
Patrick McHardy | f0e36f8 | 2005-07-05 14:44:55 -0700 | [diff] [blame] | 378 | } |
| 379 | |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 380 | static struct tnode* tnode_new(t_key key, int pos, int bits) |
| 381 | { |
| 382 | int nchildren = 1<<bits; |
| 383 | int sz = sizeof(struct tnode) + nchildren * sizeof(struct node *); |
Patrick McHardy | f0e36f8 | 2005-07-05 14:44:55 -0700 | [diff] [blame] | 384 | struct tnode *tn = tnode_alloc(sz); |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 385 | |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 386 | if (tn) { |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 387 | memset(tn, 0, sz); |
Robert Olsson | 2373ce1 | 2005-08-25 13:01:29 -0700 | [diff] [blame] | 388 | tn->parent = T_TNODE; |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 389 | tn->pos = pos; |
| 390 | tn->bits = bits; |
| 391 | tn->key = key; |
| 392 | tn->full_children = 0; |
| 393 | tn->empty_children = 1<<bits; |
| 394 | } |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 395 | |
Stephen Hemminger | 0c7770c | 2005-08-23 21:59:41 -0700 | [diff] [blame] | 396 | pr_debug("AT %p s=%u %u\n", tn, (unsigned int) sizeof(struct tnode), |
| 397 | (unsigned int) (sizeof(struct node) * 1<<bits)); |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 398 | return tn; |
| 399 | } |
| 400 | |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 401 | /* |
| 402 | * Check whether a tnode 'n' is "full", i.e. it is an internal node |
| 403 | * and no bits are skipped. See discussion in dyntree paper p. 6 |
| 404 | */ |
| 405 | |
Stephen Hemmigner | bb435b8 | 2005-08-09 20:25:39 -0700 | [diff] [blame] | 406 | static inline int tnode_full(const struct tnode *tn, const struct node *n) |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 407 | { |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 408 | if (n == NULL || IS_LEAF(n)) |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 409 | return 0; |
| 410 | |
| 411 | return ((struct tnode *) n)->pos == tn->pos + tn->bits; |
| 412 | } |
| 413 | |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 414 | static inline void put_child(struct trie *t, struct tnode *tn, int i, struct node *n) |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 415 | { |
| 416 | tnode_put_child_reorg(tn, i, n, -1); |
| 417 | } |
| 418 | |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 419 | /* |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 420 | * Add a child at position i overwriting the old value. |
| 421 | * Update the value of full_children and empty_children. |
| 422 | */ |
| 423 | |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 424 | static void tnode_put_child_reorg(struct tnode *tn, int i, struct node *n, int wasfull) |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 425 | { |
Robert Olsson | 2373ce1 | 2005-08-25 13:01:29 -0700 | [diff] [blame] | 426 | struct node *chi = tn->child[i]; |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 427 | int isfull; |
| 428 | |
Stephen Hemminger | 0c7770c | 2005-08-23 21:59:41 -0700 | [diff] [blame] | 429 | BUG_ON(i >= 1<<tn->bits); |
| 430 | |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 431 | |
| 432 | /* update emptyChildren */ |
| 433 | if (n == NULL && chi != NULL) |
| 434 | tn->empty_children++; |
| 435 | else if (n != NULL && chi == NULL) |
| 436 | tn->empty_children--; |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 437 | |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 438 | /* update fullChildren */ |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 439 | if (wasfull == -1) |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 440 | wasfull = tnode_full(tn, chi); |
| 441 | |
| 442 | isfull = tnode_full(tn, n); |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 443 | if (wasfull && !isfull) |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 444 | tn->full_children--; |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 445 | else if (!wasfull && isfull) |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 446 | tn->full_children++; |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 447 | |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 448 | if (n) |
| 449 | NODE_SET_PARENT(n, tn); |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 450 | |
Robert Olsson | 2373ce1 | 2005-08-25 13:01:29 -0700 | [diff] [blame] | 451 | rcu_assign_pointer(tn->child[i], n); |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 452 | } |
| 453 | |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 454 | static struct node *resize(struct trie *t, struct tnode *tn) |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 455 | { |
| 456 | int i; |
Robert Olsson | 2f36895 | 2005-07-05 15:02:40 -0700 | [diff] [blame] | 457 | int err = 0; |
Robert Olsson | 2f80b3c | 2005-08-09 20:25:06 -0700 | [diff] [blame] | 458 | struct tnode *old_tn; |
Robert Olsson | e6308be | 2005-10-04 13:01:58 -0700 | [diff] [blame] | 459 | int inflate_threshold_use; |
| 460 | int halve_threshold_use; |
Robert Olsson | 05eee48 | 2007-03-19 16:27:37 -0700 | [diff] [blame] | 461 | int max_resize; |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 462 | |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 463 | if (!tn) |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 464 | return NULL; |
| 465 | |
Stephen Hemminger | 0c7770c | 2005-08-23 21:59:41 -0700 | [diff] [blame] | 466 | pr_debug("In tnode_resize %p inflate_threshold=%d threshold=%d\n", |
| 467 | tn, inflate_threshold, halve_threshold); |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 468 | |
| 469 | /* No children */ |
| 470 | if (tn->empty_children == tnode_child_length(tn)) { |
| 471 | tnode_free(tn); |
| 472 | return NULL; |
| 473 | } |
| 474 | /* One child */ |
| 475 | if (tn->empty_children == tnode_child_length(tn) - 1) |
| 476 | for (i = 0; i < tnode_child_length(tn); i++) { |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 477 | struct node *n; |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 478 | |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 479 | n = tn->child[i]; |
Robert Olsson | 2373ce1 | 2005-08-25 13:01:29 -0700 | [diff] [blame] | 480 | if (!n) |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 481 | continue; |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 482 | |
| 483 | /* compress one level */ |
Robert Olsson | 2373ce1 | 2005-08-25 13:01:29 -0700 | [diff] [blame] | 484 | NODE_SET_PARENT(n, NULL); |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 485 | tnode_free(tn); |
| 486 | return n; |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 487 | } |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 488 | /* |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 489 | * Double as long as the resulting node has a number of |
| 490 | * nonempty nodes that are above the threshold. |
| 491 | */ |
| 492 | |
| 493 | /* |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 494 | * From "Implementing a dynamic compressed trie" by Stefan Nilsson of |
| 495 | * the Helsinki University of Technology and Matti Tikkanen of Nokia |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 496 | * Telecommunications, page 6: |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 497 | * "A node is doubled if the ratio of non-empty children to all |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 498 | * children in the *doubled* node is at least 'high'." |
| 499 | * |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 500 | * 'high' in this instance is the variable 'inflate_threshold'. It |
| 501 | * is expressed as a percentage, so we multiply it with |
| 502 | * tnode_child_length() and instead of multiplying by 2 (since the |
| 503 | * child array will be doubled by inflate()) and multiplying |
| 504 | * the left-hand side by 100 (to handle the percentage thing) we |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 505 | * multiply the left-hand side by 50. |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 506 | * |
| 507 | * The left-hand side may look a bit weird: tnode_child_length(tn) |
| 508 | * - tn->empty_children is of course the number of non-null children |
| 509 | * in the current node. tn->full_children is the number of "full" |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 510 | * children, that is non-null tnodes with a skip value of 0. |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 511 | * All of those will be doubled in the resulting inflated tnode, so |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 512 | * we just count them one extra time here. |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 513 | * |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 514 | * A clearer way to write this would be: |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 515 | * |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 516 | * to_be_doubled = tn->full_children; |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 517 | * not_to_be_doubled = tnode_child_length(tn) - tn->empty_children - |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 518 | * tn->full_children; |
| 519 | * |
| 520 | * new_child_length = tnode_child_length(tn) * 2; |
| 521 | * |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 522 | * new_fill_factor = 100 * (not_to_be_doubled + 2*to_be_doubled) / |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 523 | * new_child_length; |
| 524 | * if (new_fill_factor >= inflate_threshold) |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 525 | * |
| 526 | * ...and so on, tho it would mess up the while () loop. |
| 527 | * |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 528 | * anyway, |
| 529 | * 100 * (not_to_be_doubled + 2*to_be_doubled) / new_child_length >= |
| 530 | * inflate_threshold |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 531 | * |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 532 | * avoid a division: |
| 533 | * 100 * (not_to_be_doubled + 2*to_be_doubled) >= |
| 534 | * inflate_threshold * new_child_length |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 535 | * |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 536 | * expand not_to_be_doubled and to_be_doubled, and shorten: |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 537 | * 100 * (tnode_child_length(tn) - tn->empty_children + |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 538 | * tn->full_children) >= inflate_threshold * new_child_length |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 539 | * |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 540 | * expand new_child_length: |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 541 | * 100 * (tnode_child_length(tn) - tn->empty_children + |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 542 | * tn->full_children) >= |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 543 | * inflate_threshold * tnode_child_length(tn) * 2 |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 544 | * |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 545 | * shorten again: |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 546 | * 50 * (tn->full_children + tnode_child_length(tn) - |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 547 | * tn->empty_children) >= inflate_threshold * |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 548 | * tnode_child_length(tn) |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 549 | * |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 550 | */ |
| 551 | |
| 552 | check_tnode(tn); |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 553 | |
Robert Olsson | e6308be | 2005-10-04 13:01:58 -0700 | [diff] [blame] | 554 | /* Keep root node larger */ |
| 555 | |
Stephen Hemminger | 132adf5 | 2007-03-08 20:44:43 -0800 | [diff] [blame] | 556 | if (!tn->parent) |
Robert Olsson | e6308be | 2005-10-04 13:01:58 -0700 | [diff] [blame] | 557 | inflate_threshold_use = inflate_threshold_root; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 558 | else |
Robert Olsson | e6308be | 2005-10-04 13:01:58 -0700 | [diff] [blame] | 559 | inflate_threshold_use = inflate_threshold; |
| 560 | |
Robert Olsson | 2f36895 | 2005-07-05 15:02:40 -0700 | [diff] [blame] | 561 | err = 0; |
Robert Olsson | 05eee48 | 2007-03-19 16:27:37 -0700 | [diff] [blame] | 562 | max_resize = 10; |
| 563 | while ((tn->full_children > 0 && max_resize-- && |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 564 | 50 * (tn->full_children + tnode_child_length(tn) - tn->empty_children) >= |
Robert Olsson | e6308be | 2005-10-04 13:01:58 -0700 | [diff] [blame] | 565 | inflate_threshold_use * tnode_child_length(tn))) { |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 566 | |
Robert Olsson | 2f80b3c | 2005-08-09 20:25:06 -0700 | [diff] [blame] | 567 | old_tn = tn; |
| 568 | tn = inflate(t, tn); |
| 569 | if (IS_ERR(tn)) { |
| 570 | tn = old_tn; |
Robert Olsson | 2f36895 | 2005-07-05 15:02:40 -0700 | [diff] [blame] | 571 | #ifdef CONFIG_IP_FIB_TRIE_STATS |
| 572 | t->stats.resize_node_skipped++; |
| 573 | #endif |
| 574 | break; |
| 575 | } |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 576 | } |
| 577 | |
Robert Olsson | 05eee48 | 2007-03-19 16:27:37 -0700 | [diff] [blame] | 578 | if (max_resize < 0) { |
| 579 | if (!tn->parent) |
| 580 | printk(KERN_WARNING "Fix inflate_threshold_root. Now=%d size=%d bits\n", |
| 581 | inflate_threshold_root, tn->bits); |
| 582 | else |
| 583 | printk(KERN_WARNING "Fix inflate_threshold. Now=%d size=%d bits\n", |
| 584 | inflate_threshold, tn->bits); |
| 585 | } |
| 586 | |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 587 | check_tnode(tn); |
| 588 | |
| 589 | /* |
| 590 | * Halve as long as the number of empty children in this |
| 591 | * node is above threshold. |
| 592 | */ |
Robert Olsson | 2f36895 | 2005-07-05 15:02:40 -0700 | [diff] [blame] | 593 | |
Robert Olsson | e6308be | 2005-10-04 13:01:58 -0700 | [diff] [blame] | 594 | |
| 595 | /* Keep root node larger */ |
| 596 | |
Stephen Hemminger | 132adf5 | 2007-03-08 20:44:43 -0800 | [diff] [blame] | 597 | if (!tn->parent) |
Robert Olsson | e6308be | 2005-10-04 13:01:58 -0700 | [diff] [blame] | 598 | halve_threshold_use = halve_threshold_root; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 599 | else |
Robert Olsson | e6308be | 2005-10-04 13:01:58 -0700 | [diff] [blame] | 600 | halve_threshold_use = halve_threshold; |
| 601 | |
Robert Olsson | 2f36895 | 2005-07-05 15:02:40 -0700 | [diff] [blame] | 602 | err = 0; |
Robert Olsson | 05eee48 | 2007-03-19 16:27:37 -0700 | [diff] [blame] | 603 | max_resize = 10; |
| 604 | while (tn->bits > 1 && max_resize-- && |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 605 | 100 * (tnode_child_length(tn) - tn->empty_children) < |
Robert Olsson | e6308be | 2005-10-04 13:01:58 -0700 | [diff] [blame] | 606 | halve_threshold_use * tnode_child_length(tn)) { |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 607 | |
Robert Olsson | 2f80b3c | 2005-08-09 20:25:06 -0700 | [diff] [blame] | 608 | old_tn = tn; |
| 609 | tn = halve(t, tn); |
| 610 | if (IS_ERR(tn)) { |
| 611 | tn = old_tn; |
Robert Olsson | 2f36895 | 2005-07-05 15:02:40 -0700 | [diff] [blame] | 612 | #ifdef CONFIG_IP_FIB_TRIE_STATS |
| 613 | t->stats.resize_node_skipped++; |
| 614 | #endif |
| 615 | break; |
| 616 | } |
| 617 | } |
| 618 | |
Robert Olsson | 05eee48 | 2007-03-19 16:27:37 -0700 | [diff] [blame] | 619 | if (max_resize < 0) { |
| 620 | if (!tn->parent) |
| 621 | printk(KERN_WARNING "Fix halve_threshold_root. Now=%d size=%d bits\n", |
| 622 | halve_threshold_root, tn->bits); |
| 623 | else |
| 624 | printk(KERN_WARNING "Fix halve_threshold. Now=%d size=%d bits\n", |
| 625 | halve_threshold, tn->bits); |
| 626 | } |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 627 | |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 628 | /* Only one child remains */ |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 629 | if (tn->empty_children == tnode_child_length(tn) - 1) |
| 630 | for (i = 0; i < tnode_child_length(tn); i++) { |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 631 | struct node *n; |
| 632 | |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 633 | n = tn->child[i]; |
Robert Olsson | 2373ce1 | 2005-08-25 13:01:29 -0700 | [diff] [blame] | 634 | if (!n) |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 635 | continue; |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 636 | |
| 637 | /* compress one level */ |
| 638 | |
Robert Olsson | 2373ce1 | 2005-08-25 13:01:29 -0700 | [diff] [blame] | 639 | NODE_SET_PARENT(n, NULL); |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 640 | tnode_free(tn); |
| 641 | return n; |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 642 | } |
| 643 | |
| 644 | return (struct node *) tn; |
| 645 | } |
| 646 | |
Robert Olsson | 2f80b3c | 2005-08-09 20:25:06 -0700 | [diff] [blame] | 647 | static struct tnode *inflate(struct trie *t, struct tnode *tn) |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 648 | { |
| 649 | struct tnode *inode; |
| 650 | struct tnode *oldtnode = tn; |
| 651 | int olen = tnode_child_length(tn); |
| 652 | int i; |
| 653 | |
Stephen Hemminger | 0c7770c | 2005-08-23 21:59:41 -0700 | [diff] [blame] | 654 | pr_debug("In inflate\n"); |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 655 | |
| 656 | tn = tnode_new(oldtnode->key, oldtnode->pos, oldtnode->bits + 1); |
| 657 | |
Stephen Hemminger | 0c7770c | 2005-08-23 21:59:41 -0700 | [diff] [blame] | 658 | if (!tn) |
Robert Olsson | 2f80b3c | 2005-08-09 20:25:06 -0700 | [diff] [blame] | 659 | return ERR_PTR(-ENOMEM); |
Robert Olsson | 2f36895 | 2005-07-05 15:02:40 -0700 | [diff] [blame] | 660 | |
| 661 | /* |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 662 | * Preallocate and store tnodes before the actual work so we |
| 663 | * don't get into an inconsistent state if memory allocation |
| 664 | * fails. In case of failure we return the oldnode and inflate |
Robert Olsson | 2f36895 | 2005-07-05 15:02:40 -0700 | [diff] [blame] | 665 | * of tnode is ignored. |
| 666 | */ |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 667 | |
| 668 | for (i = 0; i < olen; i++) { |
Robert Olsson | 2f36895 | 2005-07-05 15:02:40 -0700 | [diff] [blame] | 669 | struct tnode *inode = (struct tnode *) tnode_get_child(oldtnode, i); |
| 670 | |
| 671 | if (inode && |
| 672 | IS_TNODE(inode) && |
| 673 | inode->pos == oldtnode->pos + oldtnode->bits && |
| 674 | inode->bits > 1) { |
| 675 | struct tnode *left, *right; |
Robert Olsson | 2f36895 | 2005-07-05 15:02:40 -0700 | [diff] [blame] | 676 | t_key m = TKEY_GET_MASK(inode->pos, 1); |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 677 | |
Robert Olsson | 2f36895 | 2005-07-05 15:02:40 -0700 | [diff] [blame] | 678 | left = tnode_new(inode->key&(~m), inode->pos + 1, |
| 679 | inode->bits - 1); |
Robert Olsson | 2f80b3c | 2005-08-09 20:25:06 -0700 | [diff] [blame] | 680 | if (!left) |
| 681 | goto nomem; |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 682 | |
Robert Olsson | 2f36895 | 2005-07-05 15:02:40 -0700 | [diff] [blame] | 683 | right = tnode_new(inode->key|m, inode->pos + 1, |
| 684 | inode->bits - 1); |
| 685 | |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 686 | if (!right) { |
Robert Olsson | 2f80b3c | 2005-08-09 20:25:06 -0700 | [diff] [blame] | 687 | tnode_free(left); |
| 688 | goto nomem; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 689 | } |
Robert Olsson | 2f36895 | 2005-07-05 15:02:40 -0700 | [diff] [blame] | 690 | |
| 691 | put_child(t, tn, 2*i, (struct node *) left); |
| 692 | put_child(t, tn, 2*i+1, (struct node *) right); |
| 693 | } |
| 694 | } |
| 695 | |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 696 | for (i = 0; i < olen; i++) { |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 697 | struct node *node = tnode_get_child(oldtnode, i); |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 698 | struct tnode *left, *right; |
| 699 | int size, j; |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 700 | |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 701 | /* An empty child */ |
| 702 | if (node == NULL) |
| 703 | continue; |
| 704 | |
| 705 | /* A leaf or an internal node with skipped bits */ |
| 706 | |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 707 | if (IS_LEAF(node) || ((struct tnode *) node)->pos > |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 708 | tn->pos + tn->bits - 1) { |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 709 | if (tkey_extract_bits(node->key, oldtnode->pos + oldtnode->bits, |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 710 | 1) == 0) |
| 711 | put_child(t, tn, 2*i, node); |
| 712 | else |
| 713 | put_child(t, tn, 2*i+1, node); |
| 714 | continue; |
| 715 | } |
| 716 | |
| 717 | /* An internal node with two children */ |
| 718 | inode = (struct tnode *) node; |
| 719 | |
| 720 | if (inode->bits == 1) { |
| 721 | put_child(t, tn, 2*i, inode->child[0]); |
| 722 | put_child(t, tn, 2*i+1, inode->child[1]); |
| 723 | |
| 724 | tnode_free(inode); |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 725 | continue; |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 726 | } |
| 727 | |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 728 | /* An internal node with more than two children */ |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 729 | |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 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 | */ |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 746 | |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 747 | /* Use the old key, but set the new significant |
| 748 | * bit to zero. |
| 749 | */ |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 750 | |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 751 | left = (struct tnode *) tnode_get_child(tn, 2*i); |
| 752 | put_child(t, tn, 2*i, NULL); |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 753 | |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 754 | BUG_ON(!left); |
Robert Olsson | 2f36895 | 2005-07-05 15:02:40 -0700 | [diff] [blame] | 755 | |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 756 | right = (struct tnode *) tnode_get_child(tn, 2*i+1); |
| 757 | put_child(t, tn, 2*i+1, NULL); |
Robert Olsson | 2f36895 | 2005-07-05 15:02:40 -0700 | [diff] [blame] | 758 | |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 759 | BUG_ON(!right); |
Robert Olsson | 2f36895 | 2005-07-05 15:02:40 -0700 | [diff] [blame] | 760 | |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 761 | size = tnode_child_length(left); |
| 762 | for (j = 0; j < size; j++) { |
| 763 | put_child(t, left, j, inode->child[j]); |
| 764 | put_child(t, right, j, inode->child[j + size]); |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 765 | } |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 766 | put_child(t, tn, 2*i, resize(t, left)); |
| 767 | put_child(t, tn, 2*i+1, resize(t, right)); |
| 768 | |
| 769 | tnode_free(inode); |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 770 | } |
| 771 | tnode_free(oldtnode); |
| 772 | return tn; |
Robert Olsson | 2f80b3c | 2005-08-09 20:25:06 -0700 | [diff] [blame] | 773 | nomem: |
| 774 | { |
| 775 | int size = tnode_child_length(tn); |
| 776 | int j; |
| 777 | |
Stephen Hemminger | 0c7770c | 2005-08-23 21:59:41 -0700 | [diff] [blame] | 778 | for (j = 0; j < size; j++) |
Robert Olsson | 2f80b3c | 2005-08-09 20:25:06 -0700 | [diff] [blame] | 779 | if (tn->child[j]) |
| 780 | tnode_free((struct tnode *)tn->child[j]); |
| 781 | |
| 782 | tnode_free(tn); |
Stephen Hemminger | 0c7770c | 2005-08-23 21:59:41 -0700 | [diff] [blame] | 783 | |
Robert Olsson | 2f80b3c | 2005-08-09 20:25:06 -0700 | [diff] [blame] | 784 | return ERR_PTR(-ENOMEM); |
| 785 | } |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 786 | } |
| 787 | |
Robert Olsson | 2f80b3c | 2005-08-09 20:25:06 -0700 | [diff] [blame] | 788 | static struct tnode *halve(struct trie *t, struct tnode *tn) |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 789 | { |
| 790 | struct tnode *oldtnode = tn; |
| 791 | struct node *left, *right; |
| 792 | int i; |
| 793 | int olen = tnode_child_length(tn); |
| 794 | |
Stephen Hemminger | 0c7770c | 2005-08-23 21:59:41 -0700 | [diff] [blame] | 795 | pr_debug("In halve\n"); |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 796 | |
| 797 | tn = tnode_new(oldtnode->key, oldtnode->pos, oldtnode->bits - 1); |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 798 | |
Robert Olsson | 2f80b3c | 2005-08-09 20:25:06 -0700 | [diff] [blame] | 799 | if (!tn) |
| 800 | return ERR_PTR(-ENOMEM); |
Robert Olsson | 2f36895 | 2005-07-05 15:02:40 -0700 | [diff] [blame] | 801 | |
| 802 | /* |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 803 | * Preallocate and store tnodes before the actual work so we |
| 804 | * don't get into an inconsistent state if memory allocation |
| 805 | * fails. In case of failure we return the oldnode and halve |
Robert Olsson | 2f36895 | 2005-07-05 15:02:40 -0700 | [diff] [blame] | 806 | * of tnode is ignored. |
| 807 | */ |
| 808 | |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 809 | for (i = 0; i < olen; i += 2) { |
Robert Olsson | 2f36895 | 2005-07-05 15:02:40 -0700 | [diff] [blame] | 810 | left = tnode_get_child(oldtnode, i); |
| 811 | right = tnode_get_child(oldtnode, i+1); |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 812 | |
Robert Olsson | 2f36895 | 2005-07-05 15:02:40 -0700 | [diff] [blame] | 813 | /* Two nonempty children */ |
Stephen Hemminger | 0c7770c | 2005-08-23 21:59:41 -0700 | [diff] [blame] | 814 | if (left && right) { |
Robert Olsson | 2f80b3c | 2005-08-09 20:25:06 -0700 | [diff] [blame] | 815 | struct tnode *newn; |
Stephen Hemminger | 0c7770c | 2005-08-23 21:59:41 -0700 | [diff] [blame] | 816 | |
Robert Olsson | 2f80b3c | 2005-08-09 20:25:06 -0700 | [diff] [blame] | 817 | newn = tnode_new(left->key, tn->pos + tn->bits, 1); |
Stephen Hemminger | 0c7770c | 2005-08-23 21:59:41 -0700 | [diff] [blame] | 818 | |
| 819 | if (!newn) |
Robert Olsson | 2f80b3c | 2005-08-09 20:25:06 -0700 | [diff] [blame] | 820 | goto nomem; |
Stephen Hemminger | 0c7770c | 2005-08-23 21:59:41 -0700 | [diff] [blame] | 821 | |
Robert Olsson | 2f80b3c | 2005-08-09 20:25:06 -0700 | [diff] [blame] | 822 | put_child(t, tn, i/2, (struct node *)newn); |
Robert Olsson | 2f36895 | 2005-07-05 15:02:40 -0700 | [diff] [blame] | 823 | } |
Robert Olsson | 2f36895 | 2005-07-05 15:02:40 -0700 | [diff] [blame] | 824 | |
Robert Olsson | 2f36895 | 2005-07-05 15:02:40 -0700 | [diff] [blame] | 825 | } |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 826 | |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 827 | for (i = 0; i < olen; i += 2) { |
| 828 | struct tnode *newBinNode; |
| 829 | |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 830 | left = tnode_get_child(oldtnode, i); |
| 831 | right = tnode_get_child(oldtnode, i+1); |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 832 | |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 833 | /* At least one of the children is empty */ |
| 834 | if (left == NULL) { |
| 835 | if (right == NULL) /* Both are empty */ |
| 836 | continue; |
| 837 | put_child(t, tn, i/2, right); |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 838 | continue; |
Stephen Hemminger | 0c7770c | 2005-08-23 21:59:41 -0700 | [diff] [blame] | 839 | } |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 840 | |
| 841 | if (right == NULL) { |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 842 | put_child(t, tn, i/2, left); |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 843 | continue; |
| 844 | } |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 845 | |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 846 | /* Two nonempty children */ |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 847 | newBinNode = (struct tnode *) tnode_get_child(tn, i/2); |
| 848 | put_child(t, tn, i/2, NULL); |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 849 | put_child(t, newBinNode, 0, left); |
| 850 | put_child(t, newBinNode, 1, right); |
| 851 | put_child(t, tn, i/2, resize(t, newBinNode)); |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 852 | } |
| 853 | tnode_free(oldtnode); |
| 854 | return tn; |
Robert Olsson | 2f80b3c | 2005-08-09 20:25:06 -0700 | [diff] [blame] | 855 | nomem: |
| 856 | { |
| 857 | int size = tnode_child_length(tn); |
| 858 | int j; |
| 859 | |
Stephen Hemminger | 0c7770c | 2005-08-23 21:59:41 -0700 | [diff] [blame] | 860 | for (j = 0; j < size; j++) |
Robert Olsson | 2f80b3c | 2005-08-09 20:25:06 -0700 | [diff] [blame] | 861 | if (tn->child[j]) |
| 862 | tnode_free((struct tnode *)tn->child[j]); |
| 863 | |
| 864 | tnode_free(tn); |
Stephen Hemminger | 0c7770c | 2005-08-23 21:59:41 -0700 | [diff] [blame] | 865 | |
Robert Olsson | 2f80b3c | 2005-08-09 20:25:06 -0700 | [diff] [blame] | 866 | return ERR_PTR(-ENOMEM); |
| 867 | } |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 868 | } |
| 869 | |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 870 | static void trie_init(struct trie *t) |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 871 | { |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 872 | if (!t) |
| 873 | return; |
| 874 | |
| 875 | t->size = 0; |
Robert Olsson | 2373ce1 | 2005-08-25 13:01:29 -0700 | [diff] [blame] | 876 | rcu_assign_pointer(t->trie, NULL); |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 877 | t->revision = 0; |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 878 | #ifdef CONFIG_IP_FIB_TRIE_STATS |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 879 | memset(&t->stats, 0, sizeof(struct trie_use_stats)); |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 880 | #endif |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 881 | } |
| 882 | |
Robert Olsson | 772cb71 | 2005-09-19 15:31:18 -0700 | [diff] [blame] | 883 | /* readside must use rcu_read_lock currently dump routines |
Robert Olsson | 2373ce1 | 2005-08-25 13:01:29 -0700 | [diff] [blame] | 884 | via get_fa_head and dump */ |
| 885 | |
Robert Olsson | 772cb71 | 2005-09-19 15:31:18 -0700 | [diff] [blame] | 886 | static struct leaf_info *find_leaf_info(struct leaf *l, int plen) |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 887 | { |
Robert Olsson | 772cb71 | 2005-09-19 15:31:18 -0700 | [diff] [blame] | 888 | struct hlist_head *head = &l->list; |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 889 | struct hlist_node *node; |
| 890 | struct leaf_info *li; |
| 891 | |
Robert Olsson | 2373ce1 | 2005-08-25 13:01:29 -0700 | [diff] [blame] | 892 | hlist_for_each_entry_rcu(li, node, head, hlist) |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 893 | if (li->plen == plen) |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 894 | return li; |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 895 | |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 896 | return NULL; |
| 897 | } |
| 898 | |
| 899 | static inline struct list_head * get_fa_head(struct leaf *l, int plen) |
| 900 | { |
Robert Olsson | 772cb71 | 2005-09-19 15:31:18 -0700 | [diff] [blame] | 901 | struct leaf_info *li = find_leaf_info(l, plen); |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 902 | |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 903 | if (!li) |
| 904 | return NULL; |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 905 | |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 906 | return &li->falh; |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 907 | } |
| 908 | |
| 909 | static void insert_leaf_info(struct hlist_head *head, struct leaf_info *new) |
| 910 | { |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 911 | struct leaf_info *li = NULL, *last = NULL; |
| 912 | struct hlist_node *node; |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 913 | |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 914 | if (hlist_empty(head)) { |
| 915 | hlist_add_head_rcu(&new->hlist, head); |
| 916 | } else { |
| 917 | hlist_for_each_entry(li, node, head, hlist) { |
| 918 | if (new->plen > li->plen) |
| 919 | break; |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 920 | |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 921 | last = li; |
| 922 | } |
| 923 | if (last) |
| 924 | hlist_add_after_rcu(&last->hlist, &new->hlist); |
| 925 | else |
| 926 | hlist_add_before_rcu(&new->hlist, &li->hlist); |
| 927 | } |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 928 | } |
| 929 | |
Robert Olsson | 2373ce1 | 2005-08-25 13:01:29 -0700 | [diff] [blame] | 930 | /* rcu_read_lock needs to be hold by caller from readside */ |
| 931 | |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 932 | static struct leaf * |
| 933 | fib_find_node(struct trie *t, u32 key) |
| 934 | { |
| 935 | int pos; |
| 936 | struct tnode *tn; |
| 937 | struct node *n; |
| 938 | |
| 939 | pos = 0; |
Robert Olsson | 2373ce1 | 2005-08-25 13:01:29 -0700 | [diff] [blame] | 940 | n = rcu_dereference(t->trie); |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 941 | |
| 942 | while (n != NULL && NODE_TYPE(n) == T_TNODE) { |
| 943 | tn = (struct tnode *) n; |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 944 | |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 945 | check_tnode(tn); |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 946 | |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 947 | if (tkey_sub_equals(tn->key, pos, tn->pos-pos, key)) { |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 948 | pos = tn->pos + tn->bits; |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 949 | n = tnode_get_child(tn, tkey_extract_bits(key, tn->pos, tn->bits)); |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 950 | } else |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 951 | break; |
| 952 | } |
| 953 | /* Case we have found a leaf. Compare prefixes */ |
| 954 | |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 955 | if (n != NULL && IS_LEAF(n) && tkey_equals(key, n->key)) |
| 956 | return (struct leaf *)n; |
| 957 | |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 958 | return NULL; |
| 959 | } |
| 960 | |
| 961 | static struct node *trie_rebalance(struct trie *t, struct tnode *tn) |
| 962 | { |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 963 | int wasfull; |
| 964 | t_key cindex, key; |
| 965 | struct tnode *tp = NULL; |
| 966 | |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 967 | key = tn->key; |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 968 | |
| 969 | while (tn != NULL && NODE_PARENT(tn) != NULL) { |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 970 | |
| 971 | tp = NODE_PARENT(tn); |
| 972 | cindex = tkey_extract_bits(key, tp->pos, tp->bits); |
| 973 | wasfull = tnode_full(tp, tnode_get_child(tp, cindex)); |
| 974 | tn = (struct tnode *) resize (t, (struct tnode *)tn); |
| 975 | tnode_put_child_reorg((struct tnode *)tp, cindex,(struct node*)tn, wasfull); |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 976 | |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 977 | if (!NODE_PARENT(tn)) |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 978 | break; |
| 979 | |
| 980 | tn = NODE_PARENT(tn); |
| 981 | } |
| 982 | /* Handle last (top) tnode */ |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 983 | if (IS_TNODE(tn)) |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 984 | tn = (struct tnode*) resize(t, (struct tnode *)tn); |
| 985 | |
| 986 | return (struct node*) tn; |
| 987 | } |
| 988 | |
Robert Olsson | 2373ce1 | 2005-08-25 13:01:29 -0700 | [diff] [blame] | 989 | /* only used from updater-side */ |
| 990 | |
Robert Olsson | f835e47 | 2005-06-28 15:00:39 -0700 | [diff] [blame] | 991 | static struct list_head * |
| 992 | fib_insert_node(struct trie *t, int *err, u32 key, int plen) |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 993 | { |
| 994 | int pos, newpos; |
| 995 | struct tnode *tp = NULL, *tn = NULL; |
| 996 | struct node *n; |
| 997 | struct leaf *l; |
| 998 | int missbit; |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 999 | struct list_head *fa_head = NULL; |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1000 | struct leaf_info *li; |
| 1001 | t_key cindex; |
| 1002 | |
| 1003 | pos = 0; |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 1004 | n = t->trie; |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1005 | |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 1006 | /* If we point to NULL, stop. Either the tree is empty and we should |
| 1007 | * just put a new leaf in if, or we have reached an empty child slot, |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1008 | * and we should just put our new leaf in that. |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 1009 | * If we point to a T_TNODE, check if it matches our key. Note that |
| 1010 | * a T_TNODE might be skipping any number of bits - its 'pos' need |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1011 | * not be the parent's 'pos'+'bits'! |
| 1012 | * |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 1013 | * If it does match the current key, get pos/bits from it, extract |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1014 | * the index from our key, push the T_TNODE and walk the tree. |
| 1015 | * |
| 1016 | * If it doesn't, we have to replace it with a new T_TNODE. |
| 1017 | * |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 1018 | * If we point to a T_LEAF, it might or might not have the same key |
| 1019 | * as we do. If it does, just change the value, update the T_LEAF's |
| 1020 | * value, and return it. |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1021 | * If it doesn't, we need to replace it with a T_TNODE. |
| 1022 | */ |
| 1023 | |
| 1024 | while (n != NULL && NODE_TYPE(n) == T_TNODE) { |
| 1025 | tn = (struct tnode *) n; |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 1026 | |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 1027 | check_tnode(tn); |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 1028 | |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 1029 | if (tkey_sub_equals(tn->key, pos, tn->pos-pos, key)) { |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1030 | tp = tn; |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 1031 | pos = tn->pos + tn->bits; |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1032 | n = tnode_get_child(tn, tkey_extract_bits(key, tn->pos, tn->bits)); |
| 1033 | |
Stephen Hemminger | 0c7770c | 2005-08-23 21:59:41 -0700 | [diff] [blame] | 1034 | BUG_ON(n && NODE_PARENT(n) != tn); |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 1035 | } else |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1036 | break; |
| 1037 | } |
| 1038 | |
| 1039 | /* |
| 1040 | * n ----> NULL, LEAF or TNODE |
| 1041 | * |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 1042 | * tp is n's (parent) ----> NULL or TNODE |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1043 | */ |
| 1044 | |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 1045 | BUG_ON(tp && IS_LEAF(tp)); |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1046 | |
| 1047 | /* Case 1: n is a leaf. Compare prefixes */ |
| 1048 | |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 1049 | if (n != NULL && IS_LEAF(n) && tkey_equals(key, n->key)) { |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 1050 | struct leaf *l = (struct leaf *) n; |
| 1051 | |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1052 | li = leaf_info_new(plen); |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 1053 | |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 1054 | if (!li) { |
Robert Olsson | f835e47 | 2005-06-28 15:00:39 -0700 | [diff] [blame] | 1055 | *err = -ENOMEM; |
| 1056 | goto err; |
| 1057 | } |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1058 | |
| 1059 | fa_head = &li->falh; |
| 1060 | insert_leaf_info(&l->list, li); |
| 1061 | goto done; |
| 1062 | } |
| 1063 | t->size++; |
| 1064 | l = leaf_new(); |
| 1065 | |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 1066 | if (!l) { |
Robert Olsson | f835e47 | 2005-06-28 15:00:39 -0700 | [diff] [blame] | 1067 | *err = -ENOMEM; |
| 1068 | goto err; |
| 1069 | } |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1070 | |
| 1071 | l->key = key; |
| 1072 | li = leaf_info_new(plen); |
| 1073 | |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 1074 | if (!li) { |
Robert Olsson | f835e47 | 2005-06-28 15:00:39 -0700 | [diff] [blame] | 1075 | tnode_free((struct tnode *) l); |
| 1076 | *err = -ENOMEM; |
| 1077 | goto err; |
| 1078 | } |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1079 | |
| 1080 | fa_head = &li->falh; |
| 1081 | insert_leaf_info(&l->list, li); |
| 1082 | |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1083 | if (t->trie && n == NULL) { |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 1084 | /* Case 2: n is NULL, and will just insert a new leaf */ |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1085 | |
| 1086 | NODE_SET_PARENT(l, tp); |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1087 | |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 1088 | cindex = tkey_extract_bits(key, tp->pos, tp->bits); |
| 1089 | put_child(t, (struct tnode *)tp, cindex, (struct node *)l); |
| 1090 | } else { |
| 1091 | /* Case 3: n is a LEAF or a TNODE and the key doesn't match. */ |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 1092 | /* |
| 1093 | * Add a new tnode here |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1094 | * first tnode need some special handling |
| 1095 | */ |
| 1096 | |
| 1097 | if (tp) |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 1098 | pos = tp->pos+tp->bits; |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1099 | else |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 1100 | pos = 0; |
| 1101 | |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 1102 | if (n) { |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1103 | newpos = tkey_mismatch(key, pos, n->key); |
| 1104 | tn = tnode_new(n->key, newpos, 1); |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 1105 | } else { |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1106 | newpos = 0; |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 1107 | tn = tnode_new(key, newpos, 1); /* First tnode */ |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1108 | } |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1109 | |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 1110 | if (!tn) { |
Robert Olsson | f835e47 | 2005-06-28 15:00:39 -0700 | [diff] [blame] | 1111 | free_leaf_info(li); |
| 1112 | tnode_free((struct tnode *) l); |
| 1113 | *err = -ENOMEM; |
| 1114 | goto err; |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 1115 | } |
| 1116 | |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1117 | NODE_SET_PARENT(tn, tp); |
| 1118 | |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 1119 | missbit = tkey_extract_bits(key, newpos, 1); |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1120 | put_child(t, tn, missbit, (struct node *)l); |
| 1121 | put_child(t, tn, 1-missbit, n); |
| 1122 | |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 1123 | if (tp) { |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1124 | cindex = tkey_extract_bits(key, tp->pos, tp->bits); |
| 1125 | put_child(t, (struct tnode *)tp, cindex, (struct node *)tn); |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 1126 | } else { |
Robert Olsson | 2373ce1 | 2005-08-25 13:01:29 -0700 | [diff] [blame] | 1127 | rcu_assign_pointer(t->trie, (struct node *)tn); /* First tnode */ |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1128 | tp = tn; |
| 1129 | } |
| 1130 | } |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 1131 | |
| 1132 | if (tp && tp->pos + tp->bits > 32) |
Stephen Hemminger | 78c6671 | 2005-09-21 00:15:39 -0700 | [diff] [blame] | 1133 | printk(KERN_WARNING "fib_trie tp=%p pos=%d, bits=%d, key=%0x plen=%d\n", |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1134 | tp, tp->pos, tp->bits, key, plen); |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 1135 | |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1136 | /* Rebalance the trie */ |
Robert Olsson | 2373ce1 | 2005-08-25 13:01:29 -0700 | [diff] [blame] | 1137 | |
| 1138 | rcu_assign_pointer(t->trie, trie_rebalance(t, tp)); |
Robert Olsson | f835e47 | 2005-06-28 15:00:39 -0700 | [diff] [blame] | 1139 | done: |
| 1140 | t->revision++; |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 1141 | err: |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1142 | return fa_head; |
| 1143 | } |
| 1144 | |
Robert Olsson | d562f1f | 2007-03-26 14:22:22 -0700 | [diff] [blame] | 1145 | /* |
| 1146 | * Caller must hold RTNL. |
| 1147 | */ |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 1148 | static int fn_trie_insert(struct fib_table *tb, struct fib_config *cfg) |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1149 | { |
| 1150 | struct trie *t = (struct trie *) tb->tb_data; |
| 1151 | struct fib_alias *fa, *new_fa; |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 1152 | struct list_head *fa_head = NULL; |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1153 | struct fib_info *fi; |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 1154 | int plen = cfg->fc_dst_len; |
| 1155 | u8 tos = cfg->fc_tos; |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1156 | u32 key, mask; |
| 1157 | int err; |
| 1158 | struct leaf *l; |
| 1159 | |
| 1160 | if (plen > 32) |
| 1161 | return -EINVAL; |
| 1162 | |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 1163 | key = ntohl(cfg->fc_dst); |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1164 | |
Patrick McHardy | 2dfe55b | 2006-08-10 23:08:33 -0700 | [diff] [blame] | 1165 | pr_debug("Insert table=%u %08x/%d\n", tb->tb_id, key, plen); |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1166 | |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 1167 | mask = ntohl(inet_make_mask(plen)); |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1168 | |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 1169 | if (key & ~mask) |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1170 | return -EINVAL; |
| 1171 | |
| 1172 | key = key & mask; |
| 1173 | |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 1174 | fi = fib_create_info(cfg); |
| 1175 | if (IS_ERR(fi)) { |
| 1176 | err = PTR_ERR(fi); |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1177 | goto err; |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 1178 | } |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1179 | |
| 1180 | l = fib_find_node(t, key); |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 1181 | fa = NULL; |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1182 | |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 1183 | if (l) { |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1184 | fa_head = get_fa_head(l, plen); |
| 1185 | fa = fib_find_alias(fa_head, tos, fi->fib_priority); |
| 1186 | } |
| 1187 | |
| 1188 | /* Now fa, if non-NULL, points to the first fib alias |
| 1189 | * with the same keys [prefix,tos,priority], if such key already |
| 1190 | * exists or to the node before which we will insert new one. |
| 1191 | * |
| 1192 | * If fa is NULL, we will need to allocate a new one and |
| 1193 | * insert to the head of f. |
| 1194 | * |
| 1195 | * If f is NULL, no fib node matched the destination key |
| 1196 | * and we need to allocate a new one of those as well. |
| 1197 | */ |
| 1198 | |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 1199 | if (fa && fa->fa_info->fib_priority == fi->fib_priority) { |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1200 | struct fib_alias *fa_orig; |
| 1201 | |
| 1202 | err = -EEXIST; |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 1203 | if (cfg->fc_nlflags & NLM_F_EXCL) |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1204 | goto out; |
| 1205 | |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 1206 | if (cfg->fc_nlflags & NLM_F_REPLACE) { |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1207 | struct fib_info *fi_drop; |
| 1208 | u8 state; |
| 1209 | |
Robert Olsson | 2373ce1 | 2005-08-25 13:01:29 -0700 | [diff] [blame] | 1210 | err = -ENOBUFS; |
Christoph Lameter | e94b176 | 2006-12-06 20:33:17 -0800 | [diff] [blame] | 1211 | new_fa = kmem_cache_alloc(fn_alias_kmem, GFP_KERNEL); |
Robert Olsson | 2373ce1 | 2005-08-25 13:01:29 -0700 | [diff] [blame] | 1212 | if (new_fa == NULL) |
| 1213 | goto out; |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1214 | |
| 1215 | fi_drop = fa->fa_info; |
Robert Olsson | 2373ce1 | 2005-08-25 13:01:29 -0700 | [diff] [blame] | 1216 | new_fa->fa_tos = fa->fa_tos; |
| 1217 | new_fa->fa_info = fi; |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 1218 | new_fa->fa_type = cfg->fc_type; |
| 1219 | new_fa->fa_scope = cfg->fc_scope; |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1220 | state = fa->fa_state; |
Robert Olsson | 2373ce1 | 2005-08-25 13:01:29 -0700 | [diff] [blame] | 1221 | new_fa->fa_state &= ~FA_S_ACCESSED; |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1222 | |
Robert Olsson | 2373ce1 | 2005-08-25 13:01:29 -0700 | [diff] [blame] | 1223 | list_replace_rcu(&fa->fa_list, &new_fa->fa_list); |
| 1224 | alias_free_mem_rcu(fa); |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1225 | |
| 1226 | fib_release_info(fi_drop); |
| 1227 | if (state & FA_S_ACCESSED) |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 1228 | rt_cache_flush(-1); |
Milan Kocian | b8f5583 | 2007-05-23 14:55:06 -0700 | [diff] [blame] | 1229 | rtmsg_fib(RTM_NEWROUTE, htonl(key), new_fa, plen, |
| 1230 | tb->tb_id, &cfg->fc_nlinfo, NLM_F_REPLACE); |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1231 | |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 1232 | goto succeeded; |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1233 | } |
| 1234 | /* Error if we find a perfect match which |
| 1235 | * uses the same scope, type, and nexthop |
| 1236 | * information. |
| 1237 | */ |
| 1238 | fa_orig = fa; |
| 1239 | list_for_each_entry(fa, fa_orig->fa_list.prev, fa_list) { |
| 1240 | if (fa->fa_tos != tos) |
| 1241 | break; |
| 1242 | if (fa->fa_info->fib_priority != fi->fib_priority) |
| 1243 | break; |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 1244 | if (fa->fa_type == cfg->fc_type && |
| 1245 | fa->fa_scope == cfg->fc_scope && |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1246 | fa->fa_info == fi) { |
| 1247 | goto out; |
| 1248 | } |
| 1249 | } |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 1250 | if (!(cfg->fc_nlflags & NLM_F_APPEND)) |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1251 | fa = fa_orig; |
| 1252 | } |
| 1253 | err = -ENOENT; |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 1254 | if (!(cfg->fc_nlflags & NLM_F_CREATE)) |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1255 | goto out; |
| 1256 | |
| 1257 | err = -ENOBUFS; |
Christoph Lameter | e94b176 | 2006-12-06 20:33:17 -0800 | [diff] [blame] | 1258 | new_fa = kmem_cache_alloc(fn_alias_kmem, GFP_KERNEL); |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1259 | if (new_fa == NULL) |
| 1260 | goto out; |
| 1261 | |
| 1262 | new_fa->fa_info = fi; |
| 1263 | new_fa->fa_tos = tos; |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 1264 | new_fa->fa_type = cfg->fc_type; |
| 1265 | new_fa->fa_scope = cfg->fc_scope; |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1266 | new_fa->fa_state = 0; |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1267 | /* |
| 1268 | * Insert new entry to the list. |
| 1269 | */ |
| 1270 | |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 1271 | if (!fa_head) { |
Robert Olsson | f835e47 | 2005-06-28 15:00:39 -0700 | [diff] [blame] | 1272 | err = 0; |
Herbert Xu | b47b2ec | 2006-07-12 13:29:56 -0700 | [diff] [blame] | 1273 | fa_head = fib_insert_node(t, &err, key, plen); |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 1274 | if (err) |
Robert Olsson | f835e47 | 2005-06-28 15:00:39 -0700 | [diff] [blame] | 1275 | goto out_free_new_fa; |
| 1276 | } |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1277 | |
Robert Olsson | 2373ce1 | 2005-08-25 13:01:29 -0700 | [diff] [blame] | 1278 | list_add_tail_rcu(&new_fa->fa_list, |
| 1279 | (fa ? &fa->fa_list : fa_head)); |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1280 | |
| 1281 | rt_cache_flush(-1); |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 1282 | rtmsg_fib(RTM_NEWROUTE, htonl(key), new_fa, plen, tb->tb_id, |
Milan Kocian | b8f5583 | 2007-05-23 14:55:06 -0700 | [diff] [blame] | 1283 | &cfg->fc_nlinfo, 0); |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1284 | succeeded: |
| 1285 | return 0; |
Robert Olsson | f835e47 | 2005-06-28 15:00:39 -0700 | [diff] [blame] | 1286 | |
| 1287 | out_free_new_fa: |
| 1288 | kmem_cache_free(fn_alias_kmem, new_fa); |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1289 | out: |
| 1290 | fib_release_info(fi); |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 1291 | err: |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1292 | return err; |
| 1293 | } |
| 1294 | |
Robert Olsson | 2373ce1 | 2005-08-25 13:01:29 -0700 | [diff] [blame] | 1295 | |
Robert Olsson | 772cb71 | 2005-09-19 15:31:18 -0700 | [diff] [blame] | 1296 | /* should be called with rcu_read_lock */ |
Stephen Hemminger | 0c7770c | 2005-08-23 21:59:41 -0700 | [diff] [blame] | 1297 | static inline int check_leaf(struct trie *t, struct leaf *l, |
| 1298 | t_key key, int *plen, const struct flowi *flp, |
Patrick McHardy | 06c7427 | 2005-08-23 22:06:09 -0700 | [diff] [blame] | 1299 | struct fib_result *res) |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1300 | { |
Patrick McHardy | 06c7427 | 2005-08-23 22:06:09 -0700 | [diff] [blame] | 1301 | int err, i; |
Al Viro | 888454c | 2006-09-19 13:42:46 -0700 | [diff] [blame] | 1302 | __be32 mask; |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1303 | struct leaf_info *li; |
| 1304 | struct hlist_head *hhead = &l->list; |
| 1305 | struct hlist_node *node; |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 1306 | |
Robert Olsson | 2373ce1 | 2005-08-25 13:01:29 -0700 | [diff] [blame] | 1307 | hlist_for_each_entry_rcu(li, node, hhead, hlist) { |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1308 | i = li->plen; |
Al Viro | 888454c | 2006-09-19 13:42:46 -0700 | [diff] [blame] | 1309 | mask = inet_make_mask(i); |
| 1310 | if (l->key != (key & ntohl(mask))) |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1311 | continue; |
| 1312 | |
Al Viro | 888454c | 2006-09-19 13:42:46 -0700 | [diff] [blame] | 1313 | if ((err = fib_semantic_match(&li->falh, flp, res, htonl(l->key), mask, i)) <= 0) { |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1314 | *plen = i; |
| 1315 | #ifdef CONFIG_IP_FIB_TRIE_STATS |
| 1316 | t->stats.semantic_match_passed++; |
| 1317 | #endif |
Patrick McHardy | 06c7427 | 2005-08-23 22:06:09 -0700 | [diff] [blame] | 1318 | return err; |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1319 | } |
| 1320 | #ifdef CONFIG_IP_FIB_TRIE_STATS |
| 1321 | t->stats.semantic_match_miss++; |
| 1322 | #endif |
| 1323 | } |
Patrick McHardy | 06c7427 | 2005-08-23 22:06:09 -0700 | [diff] [blame] | 1324 | return 1; |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1325 | } |
| 1326 | |
| 1327 | static int |
| 1328 | fn_trie_lookup(struct fib_table *tb, const struct flowi *flp, struct fib_result *res) |
| 1329 | { |
| 1330 | struct trie *t = (struct trie *) tb->tb_data; |
| 1331 | int plen, ret = 0; |
| 1332 | struct node *n; |
| 1333 | struct tnode *pn; |
| 1334 | int pos, bits; |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 1335 | t_key key = ntohl(flp->fl4_dst); |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1336 | int chopped_off; |
| 1337 | t_key cindex = 0; |
| 1338 | int current_prefix_length = KEYLENGTH; |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 1339 | struct tnode *cn; |
| 1340 | t_key node_prefix, key_prefix, pref_mismatch; |
| 1341 | int mp; |
| 1342 | |
Robert Olsson | 2373ce1 | 2005-08-25 13:01:29 -0700 | [diff] [blame] | 1343 | rcu_read_lock(); |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1344 | |
Robert Olsson | 2373ce1 | 2005-08-25 13:01:29 -0700 | [diff] [blame] | 1345 | n = rcu_dereference(t->trie); |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 1346 | if (!n) |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1347 | goto failed; |
| 1348 | |
| 1349 | #ifdef CONFIG_IP_FIB_TRIE_STATS |
| 1350 | t->stats.gets++; |
| 1351 | #endif |
| 1352 | |
| 1353 | /* Just a leaf? */ |
| 1354 | if (IS_LEAF(n)) { |
Patrick McHardy | 06c7427 | 2005-08-23 22:06:09 -0700 | [diff] [blame] | 1355 | if ((ret = check_leaf(t, (struct leaf *)n, key, &plen, flp, res)) <= 0) |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1356 | goto found; |
| 1357 | goto failed; |
| 1358 | } |
| 1359 | pn = (struct tnode *) n; |
| 1360 | chopped_off = 0; |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 1361 | |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 1362 | while (pn) { |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1363 | pos = pn->pos; |
| 1364 | bits = pn->bits; |
| 1365 | |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 1366 | if (!chopped_off) |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1367 | cindex = tkey_extract_bits(MASK_PFX(key, current_prefix_length), pos, bits); |
| 1368 | |
| 1369 | n = tnode_get_child(pn, cindex); |
| 1370 | |
| 1371 | if (n == NULL) { |
| 1372 | #ifdef CONFIG_IP_FIB_TRIE_STATS |
| 1373 | t->stats.null_node_hit++; |
| 1374 | #endif |
| 1375 | goto backtrace; |
| 1376 | } |
| 1377 | |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 1378 | if (IS_LEAF(n)) { |
Patrick McHardy | 06c7427 | 2005-08-23 22:06:09 -0700 | [diff] [blame] | 1379 | if ((ret = check_leaf(t, (struct leaf *)n, key, &plen, flp, res)) <= 0) |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1380 | goto found; |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 1381 | else |
| 1382 | goto backtrace; |
| 1383 | } |
| 1384 | |
| 1385 | #define HL_OPTIMIZE |
| 1386 | #ifdef HL_OPTIMIZE |
| 1387 | cn = (struct tnode *)n; |
| 1388 | |
| 1389 | /* |
| 1390 | * It's a tnode, and we can do some extra checks here if we |
| 1391 | * like, to avoid descending into a dead-end branch. |
| 1392 | * This tnode is in the parent's child array at index |
| 1393 | * key[p_pos..p_pos+p_bits] but potentially with some bits |
| 1394 | * chopped off, so in reality the index may be just a |
| 1395 | * subprefix, padded with zero at the end. |
| 1396 | * We can also take a look at any skipped bits in this |
| 1397 | * tnode - everything up to p_pos is supposed to be ok, |
| 1398 | * and the non-chopped bits of the index (se previous |
| 1399 | * paragraph) are also guaranteed ok, but the rest is |
| 1400 | * considered unknown. |
| 1401 | * |
| 1402 | * The skipped bits are key[pos+bits..cn->pos]. |
| 1403 | */ |
| 1404 | |
| 1405 | /* If current_prefix_length < pos+bits, we are already doing |
| 1406 | * actual prefix matching, which means everything from |
| 1407 | * pos+(bits-chopped_off) onward must be zero along some |
| 1408 | * branch of this subtree - otherwise there is *no* valid |
| 1409 | * prefix present. Here we can only check the skipped |
| 1410 | * bits. Remember, since we have already indexed into the |
| 1411 | * parent's child array, we know that the bits we chopped of |
| 1412 | * *are* zero. |
| 1413 | */ |
| 1414 | |
| 1415 | /* NOTA BENE: CHECKING ONLY SKIPPED BITS FOR THE NEW NODE HERE */ |
| 1416 | |
| 1417 | if (current_prefix_length < pos+bits) { |
| 1418 | if (tkey_extract_bits(cn->key, current_prefix_length, |
| 1419 | cn->pos - current_prefix_length) != 0 || |
| 1420 | !(cn->child[0])) |
| 1421 | goto backtrace; |
| 1422 | } |
| 1423 | |
| 1424 | /* |
| 1425 | * If chopped_off=0, the index is fully validated and we |
| 1426 | * only need to look at the skipped bits for this, the new, |
| 1427 | * tnode. What we actually want to do is to find out if |
| 1428 | * these skipped bits match our key perfectly, or if we will |
| 1429 | * have to count on finding a matching prefix further down, |
| 1430 | * because if we do, we would like to have some way of |
| 1431 | * verifying the existence of such a prefix at this point. |
| 1432 | */ |
| 1433 | |
| 1434 | /* The only thing we can do at this point is to verify that |
| 1435 | * any such matching prefix can indeed be a prefix to our |
| 1436 | * key, and if the bits in the node we are inspecting that |
| 1437 | * do not match our key are not ZERO, this cannot be true. |
| 1438 | * Thus, find out where there is a mismatch (before cn->pos) |
| 1439 | * and verify that all the mismatching bits are zero in the |
| 1440 | * new tnode's key. |
| 1441 | */ |
| 1442 | |
| 1443 | /* Note: We aren't very concerned about the piece of the key |
| 1444 | * that precede pn->pos+pn->bits, since these have already been |
| 1445 | * checked. The bits after cn->pos aren't checked since these are |
| 1446 | * by definition "unknown" at this point. Thus, what we want to |
| 1447 | * see is if we are about to enter the "prefix matching" state, |
| 1448 | * and in that case verify that the skipped bits that will prevail |
| 1449 | * throughout this subtree are zero, as they have to be if we are |
| 1450 | * to find a matching prefix. |
| 1451 | */ |
| 1452 | |
| 1453 | node_prefix = MASK_PFX(cn->key, cn->pos); |
| 1454 | key_prefix = MASK_PFX(key, cn->pos); |
| 1455 | pref_mismatch = key_prefix^node_prefix; |
| 1456 | mp = 0; |
| 1457 | |
| 1458 | /* In short: If skipped bits in this node do not match the search |
| 1459 | * key, enter the "prefix matching" state.directly. |
| 1460 | */ |
| 1461 | if (pref_mismatch) { |
| 1462 | while (!(pref_mismatch & (1<<(KEYLENGTH-1)))) { |
| 1463 | mp++; |
| 1464 | pref_mismatch = pref_mismatch <<1; |
| 1465 | } |
| 1466 | key_prefix = tkey_extract_bits(cn->key, mp, cn->pos-mp); |
| 1467 | |
| 1468 | if (key_prefix != 0) |
| 1469 | goto backtrace; |
| 1470 | |
| 1471 | if (current_prefix_length >= cn->pos) |
| 1472 | current_prefix_length = mp; |
| 1473 | } |
| 1474 | #endif |
| 1475 | pn = (struct tnode *)n; /* Descend */ |
| 1476 | chopped_off = 0; |
| 1477 | continue; |
| 1478 | |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1479 | backtrace: |
| 1480 | chopped_off++; |
| 1481 | |
| 1482 | /* As zero don't change the child key (cindex) */ |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 1483 | while ((chopped_off <= pn->bits) && !(cindex & (1<<(chopped_off-1)))) |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1484 | chopped_off++; |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1485 | |
| 1486 | /* Decrease current_... with bits chopped off */ |
| 1487 | if (current_prefix_length > pn->pos + pn->bits - chopped_off) |
| 1488 | current_prefix_length = pn->pos + pn->bits - chopped_off; |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 1489 | |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1490 | /* |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 1491 | * Either we do the actual chop off according or if we have |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1492 | * chopped off all bits in this tnode walk up to our parent. |
| 1493 | */ |
| 1494 | |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 1495 | if (chopped_off <= pn->bits) { |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1496 | cindex &= ~(1 << (chopped_off-1)); |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 1497 | } else { |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 1498 | if (NODE_PARENT(pn) == NULL) |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1499 | goto failed; |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 1500 | |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1501 | /* Get Child's index */ |
| 1502 | cindex = tkey_extract_bits(pn->key, NODE_PARENT(pn)->pos, NODE_PARENT(pn)->bits); |
| 1503 | pn = NODE_PARENT(pn); |
| 1504 | chopped_off = 0; |
| 1505 | |
| 1506 | #ifdef CONFIG_IP_FIB_TRIE_STATS |
| 1507 | t->stats.backtrack++; |
| 1508 | #endif |
| 1509 | goto backtrace; |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 1510 | } |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1511 | } |
| 1512 | failed: |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 1513 | ret = 1; |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1514 | found: |
Robert Olsson | 2373ce1 | 2005-08-25 13:01:29 -0700 | [diff] [blame] | 1515 | rcu_read_unlock(); |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1516 | return ret; |
| 1517 | } |
| 1518 | |
Robert Olsson | 2373ce1 | 2005-08-25 13:01:29 -0700 | [diff] [blame] | 1519 | /* only called from updater side */ |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1520 | static int trie_leaf_remove(struct trie *t, t_key key) |
| 1521 | { |
| 1522 | t_key cindex; |
| 1523 | struct tnode *tp = NULL; |
| 1524 | struct node *n = t->trie; |
| 1525 | struct leaf *l; |
| 1526 | |
Stephen Hemminger | 0c7770c | 2005-08-23 21:59:41 -0700 | [diff] [blame] | 1527 | pr_debug("entering trie_leaf_remove(%p)\n", n); |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1528 | |
| 1529 | /* Note that in the case skipped bits, those bits are *not* checked! |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 1530 | * When we finish this, we will have NULL or a T_LEAF, and the |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1531 | * T_LEAF may or may not match our key. |
| 1532 | */ |
| 1533 | |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 1534 | while (n != NULL && IS_TNODE(n)) { |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1535 | struct tnode *tn = (struct tnode *) n; |
| 1536 | check_tnode(tn); |
| 1537 | n = tnode_get_child(tn ,tkey_extract_bits(key, tn->pos, tn->bits)); |
| 1538 | |
Stephen Hemminger | 0c7770c | 2005-08-23 21:59:41 -0700 | [diff] [blame] | 1539 | BUG_ON(n && NODE_PARENT(n) != tn); |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 1540 | } |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1541 | l = (struct leaf *) n; |
| 1542 | |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 1543 | if (!n || !tkey_equals(l->key, key)) |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1544 | return 0; |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 1545 | |
| 1546 | /* |
| 1547 | * Key found. |
| 1548 | * Remove the leaf and rebalance the tree |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1549 | */ |
| 1550 | |
| 1551 | t->revision++; |
| 1552 | t->size--; |
| 1553 | |
| 1554 | tp = NODE_PARENT(n); |
| 1555 | tnode_free((struct tnode *) n); |
| 1556 | |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 1557 | if (tp) { |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1558 | cindex = tkey_extract_bits(key, tp->pos, tp->bits); |
| 1559 | put_child(t, (struct tnode *)tp, cindex, NULL); |
Robert Olsson | 2373ce1 | 2005-08-25 13:01:29 -0700 | [diff] [blame] | 1560 | rcu_assign_pointer(t->trie, trie_rebalance(t, tp)); |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 1561 | } else |
Robert Olsson | 2373ce1 | 2005-08-25 13:01:29 -0700 | [diff] [blame] | 1562 | rcu_assign_pointer(t->trie, NULL); |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1563 | |
| 1564 | return 1; |
| 1565 | } |
| 1566 | |
Robert Olsson | d562f1f | 2007-03-26 14:22:22 -0700 | [diff] [blame] | 1567 | /* |
| 1568 | * Caller must hold RTNL. |
| 1569 | */ |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 1570 | static int fn_trie_delete(struct fib_table *tb, struct fib_config *cfg) |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1571 | { |
| 1572 | struct trie *t = (struct trie *) tb->tb_data; |
| 1573 | u32 key, mask; |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 1574 | int plen = cfg->fc_dst_len; |
| 1575 | u8 tos = cfg->fc_tos; |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1576 | struct fib_alias *fa, *fa_to_delete; |
| 1577 | struct list_head *fa_head; |
| 1578 | struct leaf *l; |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 1579 | struct leaf_info *li; |
| 1580 | |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 1581 | if (plen > 32) |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1582 | return -EINVAL; |
| 1583 | |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 1584 | key = ntohl(cfg->fc_dst); |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 1585 | mask = ntohl(inet_make_mask(plen)); |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1586 | |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 1587 | if (key & ~mask) |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1588 | return -EINVAL; |
| 1589 | |
| 1590 | key = key & mask; |
| 1591 | l = fib_find_node(t, key); |
| 1592 | |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 1593 | if (!l) |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1594 | return -ESRCH; |
| 1595 | |
| 1596 | fa_head = get_fa_head(l, plen); |
| 1597 | fa = fib_find_alias(fa_head, tos, 0); |
| 1598 | |
| 1599 | if (!fa) |
| 1600 | return -ESRCH; |
| 1601 | |
Stephen Hemminger | 0c7770c | 2005-08-23 21:59:41 -0700 | [diff] [blame] | 1602 | pr_debug("Deleting %08x/%d tos=%d t=%p\n", key, plen, tos, t); |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1603 | |
| 1604 | fa_to_delete = NULL; |
| 1605 | fa_head = fa->fa_list.prev; |
Robert Olsson | 2373ce1 | 2005-08-25 13:01:29 -0700 | [diff] [blame] | 1606 | |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1607 | list_for_each_entry(fa, fa_head, fa_list) { |
| 1608 | struct fib_info *fi = fa->fa_info; |
| 1609 | |
| 1610 | if (fa->fa_tos != tos) |
| 1611 | break; |
| 1612 | |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 1613 | if ((!cfg->fc_type || fa->fa_type == cfg->fc_type) && |
| 1614 | (cfg->fc_scope == RT_SCOPE_NOWHERE || |
| 1615 | fa->fa_scope == cfg->fc_scope) && |
| 1616 | (!cfg->fc_protocol || |
| 1617 | fi->fib_protocol == cfg->fc_protocol) && |
| 1618 | fib_nh_match(cfg, fi) == 0) { |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1619 | fa_to_delete = fa; |
| 1620 | break; |
| 1621 | } |
| 1622 | } |
| 1623 | |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 1624 | if (!fa_to_delete) |
| 1625 | return -ESRCH; |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1626 | |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 1627 | fa = fa_to_delete; |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 1628 | rtmsg_fib(RTM_DELROUTE, htonl(key), fa, plen, tb->tb_id, |
Milan Kocian | b8f5583 | 2007-05-23 14:55:06 -0700 | [diff] [blame] | 1629 | &cfg->fc_nlinfo, 0); |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1630 | |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 1631 | l = fib_find_node(t, key); |
Robert Olsson | 772cb71 | 2005-09-19 15:31:18 -0700 | [diff] [blame] | 1632 | li = find_leaf_info(l, plen); |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1633 | |
Robert Olsson | 2373ce1 | 2005-08-25 13:01:29 -0700 | [diff] [blame] | 1634 | list_del_rcu(&fa->fa_list); |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1635 | |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 1636 | if (list_empty(fa_head)) { |
Robert Olsson | 2373ce1 | 2005-08-25 13:01:29 -0700 | [diff] [blame] | 1637 | hlist_del_rcu(&li->hlist); |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 1638 | free_leaf_info(li); |
Robert Olsson | 2373ce1 | 2005-08-25 13:01:29 -0700 | [diff] [blame] | 1639 | } |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 1640 | |
| 1641 | if (hlist_empty(&l->list)) |
| 1642 | trie_leaf_remove(t, key); |
| 1643 | |
| 1644 | if (fa->fa_state & FA_S_ACCESSED) |
| 1645 | rt_cache_flush(-1); |
| 1646 | |
Robert Olsson | 2373ce1 | 2005-08-25 13:01:29 -0700 | [diff] [blame] | 1647 | fib_release_info(fa->fa_info); |
| 1648 | alias_free_mem_rcu(fa); |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 1649 | return 0; |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1650 | } |
| 1651 | |
| 1652 | static int trie_flush_list(struct trie *t, struct list_head *head) |
| 1653 | { |
| 1654 | struct fib_alias *fa, *fa_node; |
| 1655 | int found = 0; |
| 1656 | |
| 1657 | list_for_each_entry_safe(fa, fa_node, head, fa_list) { |
| 1658 | struct fib_info *fi = fa->fa_info; |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1659 | |
Robert Olsson | 2373ce1 | 2005-08-25 13:01:29 -0700 | [diff] [blame] | 1660 | if (fi && (fi->fib_flags & RTNH_F_DEAD)) { |
| 1661 | list_del_rcu(&fa->fa_list); |
| 1662 | fib_release_info(fa->fa_info); |
| 1663 | alias_free_mem_rcu(fa); |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1664 | found++; |
| 1665 | } |
| 1666 | } |
| 1667 | return found; |
| 1668 | } |
| 1669 | |
| 1670 | static int trie_flush_leaf(struct trie *t, struct leaf *l) |
| 1671 | { |
| 1672 | int found = 0; |
| 1673 | struct hlist_head *lih = &l->list; |
| 1674 | struct hlist_node *node, *tmp; |
| 1675 | struct leaf_info *li = NULL; |
| 1676 | |
| 1677 | hlist_for_each_entry_safe(li, node, tmp, lih, hlist) { |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1678 | found += trie_flush_list(t, &li->falh); |
| 1679 | |
| 1680 | if (list_empty(&li->falh)) { |
Robert Olsson | 2373ce1 | 2005-08-25 13:01:29 -0700 | [diff] [blame] | 1681 | hlist_del_rcu(&li->hlist); |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1682 | free_leaf_info(li); |
| 1683 | } |
| 1684 | } |
| 1685 | return found; |
| 1686 | } |
| 1687 | |
Robert Olsson | 2373ce1 | 2005-08-25 13:01:29 -0700 | [diff] [blame] | 1688 | /* rcu_read_lock needs to be hold by caller from readside */ |
| 1689 | |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1690 | static struct leaf *nextleaf(struct trie *t, struct leaf *thisleaf) |
| 1691 | { |
| 1692 | struct node *c = (struct node *) thisleaf; |
| 1693 | struct tnode *p; |
| 1694 | int idx; |
Robert Olsson | 2373ce1 | 2005-08-25 13:01:29 -0700 | [diff] [blame] | 1695 | struct node *trie = rcu_dereference(t->trie); |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1696 | |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 1697 | if (c == NULL) { |
Robert Olsson | 2373ce1 | 2005-08-25 13:01:29 -0700 | [diff] [blame] | 1698 | if (trie == NULL) |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1699 | return NULL; |
| 1700 | |
Robert Olsson | 2373ce1 | 2005-08-25 13:01:29 -0700 | [diff] [blame] | 1701 | if (IS_LEAF(trie)) /* trie w. just a leaf */ |
| 1702 | return (struct leaf *) trie; |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1703 | |
Robert Olsson | 2373ce1 | 2005-08-25 13:01:29 -0700 | [diff] [blame] | 1704 | p = (struct tnode*) trie; /* Start */ |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 1705 | } else |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1706 | p = (struct tnode *) NODE_PARENT(c); |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 1707 | |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1708 | while (p) { |
| 1709 | int pos, last; |
| 1710 | |
| 1711 | /* Find the next child of the parent */ |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 1712 | if (c) |
| 1713 | pos = 1 + tkey_extract_bits(c->key, p->pos, p->bits); |
| 1714 | else |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1715 | pos = 0; |
| 1716 | |
| 1717 | last = 1 << p->bits; |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 1718 | for (idx = pos; idx < last ; idx++) { |
Robert Olsson | 2373ce1 | 2005-08-25 13:01:29 -0700 | [diff] [blame] | 1719 | c = rcu_dereference(p->child[idx]); |
| 1720 | |
| 1721 | if (!c) |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 1722 | continue; |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1723 | |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 1724 | /* Decend if tnode */ |
Robert Olsson | 2373ce1 | 2005-08-25 13:01:29 -0700 | [diff] [blame] | 1725 | while (IS_TNODE(c)) { |
| 1726 | p = (struct tnode *) c; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1727 | idx = 0; |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1728 | |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 1729 | /* Rightmost non-NULL branch */ |
| 1730 | if (p && IS_TNODE(p)) |
Robert Olsson | 2373ce1 | 2005-08-25 13:01:29 -0700 | [diff] [blame] | 1731 | while (!(c = rcu_dereference(p->child[idx])) |
| 1732 | && idx < (1<<p->bits)) idx++; |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1733 | |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 1734 | /* Done with this tnode? */ |
Robert Olsson | 2373ce1 | 2005-08-25 13:01:29 -0700 | [diff] [blame] | 1735 | if (idx >= (1 << p->bits) || !c) |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 1736 | goto up; |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1737 | } |
Robert Olsson | 2373ce1 | 2005-08-25 13:01:29 -0700 | [diff] [blame] | 1738 | return (struct leaf *) c; |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1739 | } |
| 1740 | up: |
| 1741 | /* No more children go up one step */ |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 1742 | c = (struct node *) p; |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1743 | p = (struct tnode *) NODE_PARENT(p); |
| 1744 | } |
| 1745 | return NULL; /* Ready. Root of trie */ |
| 1746 | } |
| 1747 | |
Robert Olsson | d562f1f | 2007-03-26 14:22:22 -0700 | [diff] [blame] | 1748 | /* |
| 1749 | * Caller must hold RTNL. |
| 1750 | */ |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1751 | static int fn_trie_flush(struct fib_table *tb) |
| 1752 | { |
| 1753 | struct trie *t = (struct trie *) tb->tb_data; |
| 1754 | struct leaf *ll = NULL, *l = NULL; |
| 1755 | int found = 0, h; |
| 1756 | |
| 1757 | t->revision++; |
| 1758 | |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 1759 | for (h = 0; (l = nextleaf(t, l)) != NULL; h++) { |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1760 | found += trie_flush_leaf(t, l); |
| 1761 | |
| 1762 | if (ll && hlist_empty(&ll->list)) |
| 1763 | trie_leaf_remove(t, ll->key); |
| 1764 | ll = l; |
| 1765 | } |
| 1766 | |
| 1767 | if (ll && hlist_empty(&ll->list)) |
| 1768 | trie_leaf_remove(t, ll->key); |
| 1769 | |
Stephen Hemminger | 0c7770c | 2005-08-23 21:59:41 -0700 | [diff] [blame] | 1770 | pr_debug("trie_flush found=%d\n", found); |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1771 | return found; |
| 1772 | } |
| 1773 | |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 1774 | static int trie_last_dflt = -1; |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1775 | |
| 1776 | static void |
| 1777 | fn_trie_select_default(struct fib_table *tb, const struct flowi *flp, struct fib_result *res) |
| 1778 | { |
| 1779 | struct trie *t = (struct trie *) tb->tb_data; |
| 1780 | int order, last_idx; |
| 1781 | struct fib_info *fi = NULL; |
| 1782 | struct fib_info *last_resort; |
| 1783 | struct fib_alias *fa = NULL; |
| 1784 | struct list_head *fa_head; |
| 1785 | struct leaf *l; |
| 1786 | |
| 1787 | last_idx = -1; |
| 1788 | last_resort = NULL; |
| 1789 | order = -1; |
| 1790 | |
Robert Olsson | 2373ce1 | 2005-08-25 13:01:29 -0700 | [diff] [blame] | 1791 | rcu_read_lock(); |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 1792 | |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1793 | l = fib_find_node(t, 0); |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 1794 | if (!l) |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1795 | goto out; |
| 1796 | |
| 1797 | fa_head = get_fa_head(l, 0); |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 1798 | if (!fa_head) |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1799 | goto out; |
| 1800 | |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 1801 | if (list_empty(fa_head)) |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1802 | goto out; |
| 1803 | |
Robert Olsson | 2373ce1 | 2005-08-25 13:01:29 -0700 | [diff] [blame] | 1804 | list_for_each_entry_rcu(fa, fa_head, fa_list) { |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1805 | struct fib_info *next_fi = fa->fa_info; |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 1806 | |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1807 | if (fa->fa_scope != res->scope || |
| 1808 | fa->fa_type != RTN_UNICAST) |
| 1809 | continue; |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 1810 | |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1811 | if (next_fi->fib_priority > res->fi->fib_priority) |
| 1812 | break; |
| 1813 | if (!next_fi->fib_nh[0].nh_gw || |
| 1814 | next_fi->fib_nh[0].nh_scope != RT_SCOPE_LINK) |
| 1815 | continue; |
| 1816 | fa->fa_state |= FA_S_ACCESSED; |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 1817 | |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1818 | if (fi == NULL) { |
| 1819 | if (next_fi != res->fi) |
| 1820 | break; |
| 1821 | } else if (!fib_detect_death(fi, order, &last_resort, |
| 1822 | &last_idx, &trie_last_dflt)) { |
| 1823 | if (res->fi) |
| 1824 | fib_info_put(res->fi); |
| 1825 | res->fi = fi; |
| 1826 | atomic_inc(&fi->fib_clntref); |
| 1827 | trie_last_dflt = order; |
| 1828 | goto out; |
| 1829 | } |
| 1830 | fi = next_fi; |
| 1831 | order++; |
| 1832 | } |
| 1833 | if (order <= 0 || fi == NULL) { |
| 1834 | trie_last_dflt = -1; |
| 1835 | goto out; |
| 1836 | } |
| 1837 | |
| 1838 | if (!fib_detect_death(fi, order, &last_resort, &last_idx, &trie_last_dflt)) { |
| 1839 | if (res->fi) |
| 1840 | fib_info_put(res->fi); |
| 1841 | res->fi = fi; |
| 1842 | atomic_inc(&fi->fib_clntref); |
| 1843 | trie_last_dflt = order; |
| 1844 | goto out; |
| 1845 | } |
| 1846 | if (last_idx >= 0) { |
| 1847 | if (res->fi) |
| 1848 | fib_info_put(res->fi); |
| 1849 | res->fi = last_resort; |
| 1850 | if (last_resort) |
| 1851 | atomic_inc(&last_resort->fib_clntref); |
| 1852 | } |
| 1853 | trie_last_dflt = last_idx; |
| 1854 | out:; |
Robert Olsson | 2373ce1 | 2005-08-25 13:01:29 -0700 | [diff] [blame] | 1855 | rcu_read_unlock(); |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1856 | } |
| 1857 | |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 1858 | static int fn_trie_dump_fa(t_key key, int plen, struct list_head *fah, struct fib_table *tb, |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1859 | struct sk_buff *skb, struct netlink_callback *cb) |
| 1860 | { |
| 1861 | int i, s_i; |
| 1862 | struct fib_alias *fa; |
| 1863 | |
Al Viro | 32ab5f8 | 2006-09-26 22:21:45 -0700 | [diff] [blame] | 1864 | __be32 xkey = htonl(key); |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1865 | |
Patrick McHardy | 1af5a8c | 2006-08-10 23:10:46 -0700 | [diff] [blame] | 1866 | s_i = cb->args[4]; |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1867 | i = 0; |
| 1868 | |
Robert Olsson | 2373ce1 | 2005-08-25 13:01:29 -0700 | [diff] [blame] | 1869 | /* rcu_read_lock is hold by caller */ |
| 1870 | |
| 1871 | list_for_each_entry_rcu(fa, fah, fa_list) { |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1872 | if (i < s_i) { |
| 1873 | i++; |
| 1874 | continue; |
| 1875 | } |
Stephen Hemminger | 78c6671 | 2005-09-21 00:15:39 -0700 | [diff] [blame] | 1876 | BUG_ON(!fa->fa_info); |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1877 | |
| 1878 | if (fib_dump_info(skb, NETLINK_CB(cb->skb).pid, |
| 1879 | cb->nlh->nlmsg_seq, |
| 1880 | RTM_NEWROUTE, |
| 1881 | tb->tb_id, |
| 1882 | fa->fa_type, |
| 1883 | fa->fa_scope, |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 1884 | xkey, |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1885 | plen, |
| 1886 | fa->fa_tos, |
David S. Miller | 90f6691 | 2005-06-21 14:43:28 -0700 | [diff] [blame] | 1887 | fa->fa_info, 0) < 0) { |
Patrick McHardy | 1af5a8c | 2006-08-10 23:10:46 -0700 | [diff] [blame] | 1888 | cb->args[4] = i; |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1889 | return -1; |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 1890 | } |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1891 | i++; |
| 1892 | } |
Patrick McHardy | 1af5a8c | 2006-08-10 23:10:46 -0700 | [diff] [blame] | 1893 | cb->args[4] = i; |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1894 | return skb->len; |
| 1895 | } |
| 1896 | |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 1897 | static int fn_trie_dump_plen(struct trie *t, int plen, struct fib_table *tb, struct sk_buff *skb, |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1898 | struct netlink_callback *cb) |
| 1899 | { |
| 1900 | int h, s_h; |
| 1901 | struct list_head *fa_head; |
| 1902 | struct leaf *l = NULL; |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1903 | |
Patrick McHardy | 1af5a8c | 2006-08-10 23:10:46 -0700 | [diff] [blame] | 1904 | s_h = cb->args[3]; |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1905 | |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 1906 | for (h = 0; (l = nextleaf(t, l)) != NULL; h++) { |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1907 | if (h < s_h) |
| 1908 | continue; |
| 1909 | if (h > s_h) |
Patrick McHardy | 1af5a8c | 2006-08-10 23:10:46 -0700 | [diff] [blame] | 1910 | memset(&cb->args[4], 0, |
| 1911 | sizeof(cb->args) - 4*sizeof(cb->args[0])); |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1912 | |
| 1913 | fa_head = get_fa_head(l, plen); |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 1914 | |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 1915 | if (!fa_head) |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1916 | continue; |
| 1917 | |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 1918 | if (list_empty(fa_head)) |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1919 | continue; |
| 1920 | |
| 1921 | if (fn_trie_dump_fa(l->key, plen, fa_head, tb, skb, cb)<0) { |
Patrick McHardy | 1af5a8c | 2006-08-10 23:10:46 -0700 | [diff] [blame] | 1922 | cb->args[3] = h; |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1923 | return -1; |
| 1924 | } |
| 1925 | } |
Patrick McHardy | 1af5a8c | 2006-08-10 23:10:46 -0700 | [diff] [blame] | 1926 | cb->args[3] = h; |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1927 | return skb->len; |
| 1928 | } |
| 1929 | |
| 1930 | static int fn_trie_dump(struct fib_table *tb, struct sk_buff *skb, struct netlink_callback *cb) |
| 1931 | { |
| 1932 | int m, s_m; |
| 1933 | struct trie *t = (struct trie *) tb->tb_data; |
| 1934 | |
Patrick McHardy | 1af5a8c | 2006-08-10 23:10:46 -0700 | [diff] [blame] | 1935 | s_m = cb->args[2]; |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1936 | |
Robert Olsson | 2373ce1 | 2005-08-25 13:01:29 -0700 | [diff] [blame] | 1937 | rcu_read_lock(); |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 1938 | for (m = 0; m <= 32; m++) { |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1939 | if (m < s_m) |
| 1940 | continue; |
| 1941 | if (m > s_m) |
Patrick McHardy | 1af5a8c | 2006-08-10 23:10:46 -0700 | [diff] [blame] | 1942 | memset(&cb->args[3], 0, |
| 1943 | sizeof(cb->args) - 3*sizeof(cb->args[0])); |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1944 | |
| 1945 | if (fn_trie_dump_plen(t, 32-m, tb, skb, cb)<0) { |
Patrick McHardy | 1af5a8c | 2006-08-10 23:10:46 -0700 | [diff] [blame] | 1946 | cb->args[2] = m; |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1947 | goto out; |
| 1948 | } |
| 1949 | } |
Robert Olsson | 2373ce1 | 2005-08-25 13:01:29 -0700 | [diff] [blame] | 1950 | rcu_read_unlock(); |
Patrick McHardy | 1af5a8c | 2006-08-10 23:10:46 -0700 | [diff] [blame] | 1951 | cb->args[2] = m; |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1952 | return skb->len; |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 1953 | out: |
Robert Olsson | 2373ce1 | 2005-08-25 13:01:29 -0700 | [diff] [blame] | 1954 | rcu_read_unlock(); |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1955 | return -1; |
| 1956 | } |
| 1957 | |
| 1958 | /* Fix more generic FIB names for init later */ |
| 1959 | |
| 1960 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
Patrick McHardy | 2dfe55b | 2006-08-10 23:08:33 -0700 | [diff] [blame] | 1961 | struct fib_table * fib_hash_init(u32 id) |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1962 | #else |
Patrick McHardy | 2dfe55b | 2006-08-10 23:08:33 -0700 | [diff] [blame] | 1963 | struct fib_table * __init fib_hash_init(u32 id) |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1964 | #endif |
| 1965 | { |
| 1966 | struct fib_table *tb; |
| 1967 | struct trie *t; |
| 1968 | |
| 1969 | if (fn_alias_kmem == NULL) |
| 1970 | fn_alias_kmem = kmem_cache_create("ip_fib_alias", |
| 1971 | sizeof(struct fib_alias), |
| 1972 | 0, SLAB_HWCACHE_ALIGN, |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame^] | 1973 | NULL); |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1974 | |
| 1975 | tb = kmalloc(sizeof(struct fib_table) + sizeof(struct trie), |
| 1976 | GFP_KERNEL); |
| 1977 | if (tb == NULL) |
| 1978 | return NULL; |
| 1979 | |
| 1980 | tb->tb_id = id; |
| 1981 | tb->tb_lookup = fn_trie_lookup; |
| 1982 | tb->tb_insert = fn_trie_insert; |
| 1983 | tb->tb_delete = fn_trie_delete; |
| 1984 | tb->tb_flush = fn_trie_flush; |
| 1985 | tb->tb_select_default = fn_trie_select_default; |
| 1986 | tb->tb_dump = fn_trie_dump; |
| 1987 | memset(tb->tb_data, 0, sizeof(struct trie)); |
| 1988 | |
| 1989 | t = (struct trie *) tb->tb_data; |
| 1990 | |
| 1991 | trie_init(t); |
| 1992 | |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 1993 | if (id == RT_TABLE_LOCAL) |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 1994 | trie_local = t; |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 1995 | else if (id == RT_TABLE_MAIN) |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 1996 | trie_main = t; |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 1997 | |
| 1998 | if (id == RT_TABLE_LOCAL) |
Stephen Hemminger | 78c6671 | 2005-09-21 00:15:39 -0700 | [diff] [blame] | 1999 | printk(KERN_INFO "IPv4 FIB: Using LC-trie version %s\n", VERSION); |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 2000 | |
| 2001 | return tb; |
| 2002 | } |
| 2003 | |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 2004 | #ifdef CONFIG_PROC_FS |
Stephen Hemminger | cb7b593 | 2005-09-09 13:35:42 -0700 | [diff] [blame] | 2005 | /* Depth first Trie walk iterator */ |
| 2006 | struct fib_trie_iter { |
| 2007 | struct tnode *tnode; |
| 2008 | struct trie *trie; |
| 2009 | unsigned index; |
| 2010 | unsigned depth; |
| 2011 | }; |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 2012 | |
Stephen Hemminger | cb7b593 | 2005-09-09 13:35:42 -0700 | [diff] [blame] | 2013 | static struct node *fib_trie_get_next(struct fib_trie_iter *iter) |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 2014 | { |
Stephen Hemminger | cb7b593 | 2005-09-09 13:35:42 -0700 | [diff] [blame] | 2015 | struct tnode *tn = iter->tnode; |
| 2016 | unsigned cindex = iter->index; |
| 2017 | struct tnode *p; |
| 2018 | |
Eric W. Biederman | 6640e69 | 2007-01-24 14:42:04 -0800 | [diff] [blame] | 2019 | /* A single entry routing table */ |
| 2020 | if (!tn) |
| 2021 | return NULL; |
| 2022 | |
Stephen Hemminger | cb7b593 | 2005-09-09 13:35:42 -0700 | [diff] [blame] | 2023 | pr_debug("get_next iter={node=%p index=%d depth=%d}\n", |
| 2024 | iter->tnode, iter->index, iter->depth); |
| 2025 | rescan: |
| 2026 | while (cindex < (1<<tn->bits)) { |
| 2027 | struct node *n = tnode_get_child(tn, cindex); |
| 2028 | |
| 2029 | if (n) { |
| 2030 | if (IS_LEAF(n)) { |
| 2031 | iter->tnode = tn; |
| 2032 | iter->index = cindex + 1; |
| 2033 | } else { |
| 2034 | /* push down one level */ |
| 2035 | iter->tnode = (struct tnode *) n; |
| 2036 | iter->index = 0; |
| 2037 | ++iter->depth; |
| 2038 | } |
| 2039 | return n; |
| 2040 | } |
| 2041 | |
| 2042 | ++cindex; |
| 2043 | } |
| 2044 | |
| 2045 | /* Current node exhausted, pop back up */ |
| 2046 | p = NODE_PARENT(tn); |
| 2047 | if (p) { |
| 2048 | cindex = tkey_extract_bits(tn->key, p->pos, p->bits)+1; |
| 2049 | tn = p; |
| 2050 | --iter->depth; |
| 2051 | goto rescan; |
| 2052 | } |
| 2053 | |
| 2054 | /* got root? */ |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 2055 | return NULL; |
| 2056 | } |
| 2057 | |
Stephen Hemminger | cb7b593 | 2005-09-09 13:35:42 -0700 | [diff] [blame] | 2058 | static struct node *fib_trie_get_first(struct fib_trie_iter *iter, |
| 2059 | struct trie *t) |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 2060 | { |
Robert Olsson | 5ddf0eb | 2006-03-20 21:34:12 -0800 | [diff] [blame] | 2061 | struct node *n ; |
| 2062 | |
Stephen Hemminger | 132adf5 | 2007-03-08 20:44:43 -0800 | [diff] [blame] | 2063 | if (!t) |
Robert Olsson | 5ddf0eb | 2006-03-20 21:34:12 -0800 | [diff] [blame] | 2064 | return NULL; |
| 2065 | |
| 2066 | n = rcu_dereference(t->trie); |
| 2067 | |
Stephen Hemminger | 132adf5 | 2007-03-08 20:44:43 -0800 | [diff] [blame] | 2068 | if (!iter) |
Robert Olsson | 5ddf0eb | 2006-03-20 21:34:12 -0800 | [diff] [blame] | 2069 | return NULL; |
Stephen Hemminger | cb7b593 | 2005-09-09 13:35:42 -0700 | [diff] [blame] | 2070 | |
Eric W. Biederman | 6640e69 | 2007-01-24 14:42:04 -0800 | [diff] [blame] | 2071 | if (n) { |
| 2072 | if (IS_TNODE(n)) { |
| 2073 | iter->tnode = (struct tnode *) n; |
| 2074 | iter->trie = t; |
| 2075 | iter->index = 0; |
| 2076 | iter->depth = 1; |
| 2077 | } else { |
| 2078 | iter->tnode = NULL; |
| 2079 | iter->trie = t; |
| 2080 | iter->index = 0; |
| 2081 | iter->depth = 0; |
| 2082 | } |
Stephen Hemminger | cb7b593 | 2005-09-09 13:35:42 -0700 | [diff] [blame] | 2083 | return n; |
| 2084 | } |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 2085 | return NULL; |
| 2086 | } |
| 2087 | |
Stephen Hemminger | cb7b593 | 2005-09-09 13:35:42 -0700 | [diff] [blame] | 2088 | static void trie_collect_stats(struct trie *t, struct trie_stat *s) |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 2089 | { |
Stephen Hemminger | cb7b593 | 2005-09-09 13:35:42 -0700 | [diff] [blame] | 2090 | struct node *n; |
| 2091 | struct fib_trie_iter iter; |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 2092 | |
Stephen Hemminger | cb7b593 | 2005-09-09 13:35:42 -0700 | [diff] [blame] | 2093 | memset(s, 0, sizeof(*s)); |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 2094 | |
Stephen Hemminger | cb7b593 | 2005-09-09 13:35:42 -0700 | [diff] [blame] | 2095 | rcu_read_lock(); |
| 2096 | for (n = fib_trie_get_first(&iter, t); n; |
| 2097 | n = fib_trie_get_next(&iter)) { |
| 2098 | if (IS_LEAF(n)) { |
| 2099 | s->leaves++; |
| 2100 | s->totdepth += iter.depth; |
| 2101 | if (iter.depth > s->maxdepth) |
| 2102 | s->maxdepth = iter.depth; |
| 2103 | } else { |
| 2104 | const struct tnode *tn = (const struct tnode *) n; |
| 2105 | int i; |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 2106 | |
Stephen Hemminger | cb7b593 | 2005-09-09 13:35:42 -0700 | [diff] [blame] | 2107 | s->tnodes++; |
Stephen Hemminger | 132adf5 | 2007-03-08 20:44:43 -0800 | [diff] [blame] | 2108 | if (tn->bits < MAX_STAT_DEPTH) |
Robert Olsson | 06ef921 | 2006-03-20 21:35:01 -0800 | [diff] [blame] | 2109 | s->nodesizes[tn->bits]++; |
| 2110 | |
Stephen Hemminger | cb7b593 | 2005-09-09 13:35:42 -0700 | [diff] [blame] | 2111 | for (i = 0; i < (1<<tn->bits); i++) |
| 2112 | if (!tn->child[i]) |
| 2113 | s->nullpointers++; |
| 2114 | } |
| 2115 | } |
| 2116 | rcu_read_unlock(); |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 2117 | } |
| 2118 | |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 2119 | /* |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 2120 | * This outputs /proc/net/fib_triestats |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 2121 | */ |
Stephen Hemminger | cb7b593 | 2005-09-09 13:35:42 -0700 | [diff] [blame] | 2122 | static void trie_show_stats(struct seq_file *seq, struct trie_stat *stat) |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 2123 | { |
Stephen Hemminger | cb7b593 | 2005-09-09 13:35:42 -0700 | [diff] [blame] | 2124 | unsigned i, max, pointers, bytes, avdepth; |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 2125 | |
Stephen Hemminger | cb7b593 | 2005-09-09 13:35:42 -0700 | [diff] [blame] | 2126 | if (stat->leaves) |
| 2127 | avdepth = stat->totdepth*100 / stat->leaves; |
| 2128 | else |
| 2129 | avdepth = 0; |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 2130 | |
Stephen Hemminger | cb7b593 | 2005-09-09 13:35:42 -0700 | [diff] [blame] | 2131 | seq_printf(seq, "\tAver depth: %d.%02d\n", avdepth / 100, avdepth % 100 ); |
| 2132 | seq_printf(seq, "\tMax depth: %u\n", stat->maxdepth); |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 2133 | |
Stephen Hemminger | cb7b593 | 2005-09-09 13:35:42 -0700 | [diff] [blame] | 2134 | seq_printf(seq, "\tLeaves: %u\n", stat->leaves); |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 2135 | |
Stephen Hemminger | cb7b593 | 2005-09-09 13:35:42 -0700 | [diff] [blame] | 2136 | bytes = sizeof(struct leaf) * stat->leaves; |
| 2137 | seq_printf(seq, "\tInternal nodes: %d\n\t", stat->tnodes); |
| 2138 | bytes += sizeof(struct tnode) * stat->tnodes; |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 2139 | |
Robert Olsson | 06ef921 | 2006-03-20 21:35:01 -0800 | [diff] [blame] | 2140 | max = MAX_STAT_DEPTH; |
| 2141 | while (max > 0 && stat->nodesizes[max-1] == 0) |
Stephen Hemminger | cb7b593 | 2005-09-09 13:35:42 -0700 | [diff] [blame] | 2142 | max--; |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 2143 | |
Stephen Hemminger | cb7b593 | 2005-09-09 13:35:42 -0700 | [diff] [blame] | 2144 | pointers = 0; |
| 2145 | for (i = 1; i <= max; i++) |
| 2146 | if (stat->nodesizes[i] != 0) { |
| 2147 | seq_printf(seq, " %d: %d", i, stat->nodesizes[i]); |
| 2148 | pointers += (1<<i) * stat->nodesizes[i]; |
| 2149 | } |
| 2150 | seq_putc(seq, '\n'); |
| 2151 | seq_printf(seq, "\tPointers: %d\n", pointers); |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 2152 | |
Stephen Hemminger | cb7b593 | 2005-09-09 13:35:42 -0700 | [diff] [blame] | 2153 | bytes += sizeof(struct node *) * pointers; |
| 2154 | seq_printf(seq, "Null ptrs: %d\n", stat->nullpointers); |
| 2155 | seq_printf(seq, "Total size: %d kB\n", (bytes + 1023) / 1024); |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 2156 | |
| 2157 | #ifdef CONFIG_IP_FIB_TRIE_STATS |
| 2158 | seq_printf(seq, "Counters:\n---------\n"); |
| 2159 | seq_printf(seq,"gets = %d\n", t->stats.gets); |
| 2160 | seq_printf(seq,"backtracks = %d\n", t->stats.backtrack); |
| 2161 | seq_printf(seq,"semantic match passed = %d\n", t->stats.semantic_match_passed); |
| 2162 | seq_printf(seq,"semantic match miss = %d\n", t->stats.semantic_match_miss); |
| 2163 | seq_printf(seq,"null node hit= %d\n", t->stats.null_node_hit); |
Robert Olsson | 2f36895 | 2005-07-05 15:02:40 -0700 | [diff] [blame] | 2164 | seq_printf(seq,"skipped node resize = %d\n", t->stats.resize_node_skipped); |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 2165 | #ifdef CLEAR_STATS |
| 2166 | memset(&(t->stats), 0, sizeof(t->stats)); |
| 2167 | #endif |
| 2168 | #endif /* CONFIG_IP_FIB_TRIE_STATS */ |
| 2169 | } |
| 2170 | |
| 2171 | static int fib_triestat_seq_show(struct seq_file *seq, void *v) |
| 2172 | { |
Stephen Hemminger | cb7b593 | 2005-09-09 13:35:42 -0700 | [diff] [blame] | 2173 | struct trie_stat *stat; |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 2174 | |
Stephen Hemminger | cb7b593 | 2005-09-09 13:35:42 -0700 | [diff] [blame] | 2175 | stat = kmalloc(sizeof(*stat), GFP_KERNEL); |
| 2176 | if (!stat) |
| 2177 | return -ENOMEM; |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 2178 | |
Stephen Hemminger | cb7b593 | 2005-09-09 13:35:42 -0700 | [diff] [blame] | 2179 | seq_printf(seq, "Basic info: size of leaf: %Zd bytes, size of tnode: %Zd bytes.\n", |
| 2180 | sizeof(struct leaf), sizeof(struct tnode)); |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 2181 | |
Stephen Hemminger | cb7b593 | 2005-09-09 13:35:42 -0700 | [diff] [blame] | 2182 | if (trie_local) { |
| 2183 | seq_printf(seq, "Local:\n"); |
| 2184 | trie_collect_stats(trie_local, stat); |
| 2185 | trie_show_stats(seq, stat); |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 2186 | } |
Stephen Hemminger | cb7b593 | 2005-09-09 13:35:42 -0700 | [diff] [blame] | 2187 | |
| 2188 | if (trie_main) { |
| 2189 | seq_printf(seq, "Main:\n"); |
| 2190 | trie_collect_stats(trie_main, stat); |
| 2191 | trie_show_stats(seq, stat); |
| 2192 | } |
| 2193 | kfree(stat); |
| 2194 | |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 2195 | return 0; |
| 2196 | } |
| 2197 | |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 2198 | static int fib_triestat_seq_open(struct inode *inode, struct file *file) |
| 2199 | { |
Stephen Hemminger | cb7b593 | 2005-09-09 13:35:42 -0700 | [diff] [blame] | 2200 | return single_open(file, fib_triestat_seq_show, NULL); |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 2201 | } |
| 2202 | |
Arjan van de Ven | 9a32144 | 2007-02-12 00:55:35 -0800 | [diff] [blame] | 2203 | static const struct file_operations fib_triestat_fops = { |
Stephen Hemminger | c877efb | 2005-07-19 14:01:51 -0700 | [diff] [blame] | 2204 | .owner = THIS_MODULE, |
| 2205 | .open = fib_triestat_seq_open, |
| 2206 | .read = seq_read, |
| 2207 | .llseek = seq_lseek, |
Stephen Hemminger | cb7b593 | 2005-09-09 13:35:42 -0700 | [diff] [blame] | 2208 | .release = single_release, |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 2209 | }; |
| 2210 | |
Stephen Hemminger | cb7b593 | 2005-09-09 13:35:42 -0700 | [diff] [blame] | 2211 | static struct node *fib_trie_get_idx(struct fib_trie_iter *iter, |
| 2212 | loff_t pos) |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 2213 | { |
Stephen Hemminger | cb7b593 | 2005-09-09 13:35:42 -0700 | [diff] [blame] | 2214 | loff_t idx = 0; |
| 2215 | struct node *n; |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 2216 | |
Stephen Hemminger | cb7b593 | 2005-09-09 13:35:42 -0700 | [diff] [blame] | 2217 | for (n = fib_trie_get_first(iter, trie_local); |
| 2218 | n; ++idx, n = fib_trie_get_next(iter)) { |
| 2219 | if (pos == idx) |
| 2220 | return n; |
| 2221 | } |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 2222 | |
Stephen Hemminger | cb7b593 | 2005-09-09 13:35:42 -0700 | [diff] [blame] | 2223 | for (n = fib_trie_get_first(iter, trie_main); |
| 2224 | n; ++idx, n = fib_trie_get_next(iter)) { |
| 2225 | if (pos == idx) |
| 2226 | return n; |
| 2227 | } |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 2228 | return NULL; |
| 2229 | } |
| 2230 | |
| 2231 | static void *fib_trie_seq_start(struct seq_file *seq, loff_t *pos) |
| 2232 | { |
Stephen Hemminger | cb7b593 | 2005-09-09 13:35:42 -0700 | [diff] [blame] | 2233 | rcu_read_lock(); |
| 2234 | if (*pos == 0) |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 2235 | return SEQ_START_TOKEN; |
Stephen Hemminger | cb7b593 | 2005-09-09 13:35:42 -0700 | [diff] [blame] | 2236 | return fib_trie_get_idx(seq->private, *pos - 1); |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 2237 | } |
| 2238 | |
| 2239 | static void *fib_trie_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 2240 | { |
Stephen Hemminger | cb7b593 | 2005-09-09 13:35:42 -0700 | [diff] [blame] | 2241 | struct fib_trie_iter *iter = seq->private; |
| 2242 | void *l = v; |
| 2243 | |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 2244 | ++*pos; |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 2245 | if (v == SEQ_START_TOKEN) |
Stephen Hemminger | cb7b593 | 2005-09-09 13:35:42 -0700 | [diff] [blame] | 2246 | return fib_trie_get_idx(iter, 0); |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 2247 | |
Stephen Hemminger | cb7b593 | 2005-09-09 13:35:42 -0700 | [diff] [blame] | 2248 | v = fib_trie_get_next(iter); |
| 2249 | BUG_ON(v == l); |
| 2250 | if (v) |
| 2251 | return v; |
| 2252 | |
| 2253 | /* continue scan in next trie */ |
| 2254 | if (iter->trie == trie_local) |
| 2255 | return fib_trie_get_first(iter, trie_main); |
| 2256 | |
| 2257 | return NULL; |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 2258 | } |
| 2259 | |
| 2260 | static void fib_trie_seq_stop(struct seq_file *seq, void *v) |
| 2261 | { |
Stephen Hemminger | cb7b593 | 2005-09-09 13:35:42 -0700 | [diff] [blame] | 2262 | rcu_read_unlock(); |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 2263 | } |
| 2264 | |
Stephen Hemminger | cb7b593 | 2005-09-09 13:35:42 -0700 | [diff] [blame] | 2265 | static void seq_indent(struct seq_file *seq, int n) |
| 2266 | { |
| 2267 | while (n-- > 0) seq_puts(seq, " "); |
| 2268 | } |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 2269 | |
Stephen Hemminger | cb7b593 | 2005-09-09 13:35:42 -0700 | [diff] [blame] | 2270 | static inline const char *rtn_scope(enum rt_scope_t s) |
| 2271 | { |
| 2272 | static char buf[32]; |
| 2273 | |
Stephen Hemminger | 132adf5 | 2007-03-08 20:44:43 -0800 | [diff] [blame] | 2274 | switch (s) { |
Stephen Hemminger | cb7b593 | 2005-09-09 13:35:42 -0700 | [diff] [blame] | 2275 | case RT_SCOPE_UNIVERSE: return "universe"; |
| 2276 | case RT_SCOPE_SITE: return "site"; |
| 2277 | case RT_SCOPE_LINK: return "link"; |
| 2278 | case RT_SCOPE_HOST: return "host"; |
| 2279 | case RT_SCOPE_NOWHERE: return "nowhere"; |
| 2280 | default: |
| 2281 | snprintf(buf, sizeof(buf), "scope=%d", s); |
| 2282 | return buf; |
| 2283 | } |
| 2284 | } |
| 2285 | |
| 2286 | static const char *rtn_type_names[__RTN_MAX] = { |
| 2287 | [RTN_UNSPEC] = "UNSPEC", |
| 2288 | [RTN_UNICAST] = "UNICAST", |
| 2289 | [RTN_LOCAL] = "LOCAL", |
| 2290 | [RTN_BROADCAST] = "BROADCAST", |
| 2291 | [RTN_ANYCAST] = "ANYCAST", |
| 2292 | [RTN_MULTICAST] = "MULTICAST", |
| 2293 | [RTN_BLACKHOLE] = "BLACKHOLE", |
| 2294 | [RTN_UNREACHABLE] = "UNREACHABLE", |
| 2295 | [RTN_PROHIBIT] = "PROHIBIT", |
| 2296 | [RTN_THROW] = "THROW", |
| 2297 | [RTN_NAT] = "NAT", |
| 2298 | [RTN_XRESOLVE] = "XRESOLVE", |
| 2299 | }; |
| 2300 | |
| 2301 | static inline const char *rtn_type(unsigned t) |
| 2302 | { |
| 2303 | static char buf[32]; |
| 2304 | |
| 2305 | if (t < __RTN_MAX && rtn_type_names[t]) |
| 2306 | return rtn_type_names[t]; |
| 2307 | snprintf(buf, sizeof(buf), "type %d", t); |
| 2308 | return buf; |
| 2309 | } |
| 2310 | |
| 2311 | /* Pretty print the trie */ |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 2312 | static int fib_trie_seq_show(struct seq_file *seq, void *v) |
| 2313 | { |
Stephen Hemminger | cb7b593 | 2005-09-09 13:35:42 -0700 | [diff] [blame] | 2314 | const struct fib_trie_iter *iter = seq->private; |
| 2315 | struct node *n = v; |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 2316 | |
Stephen Hemminger | cb7b593 | 2005-09-09 13:35:42 -0700 | [diff] [blame] | 2317 | if (v == SEQ_START_TOKEN) |
| 2318 | return 0; |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 2319 | |
Robert Olsson | 095b850 | 2007-01-26 19:06:01 -0800 | [diff] [blame] | 2320 | if (!NODE_PARENT(n)) { |
| 2321 | if (iter->trie == trie_local) |
| 2322 | seq_puts(seq, "<local>:\n"); |
| 2323 | else |
| 2324 | seq_puts(seq, "<main>:\n"); |
| 2325 | } |
| 2326 | |
Stephen Hemminger | cb7b593 | 2005-09-09 13:35:42 -0700 | [diff] [blame] | 2327 | if (IS_TNODE(n)) { |
| 2328 | struct tnode *tn = (struct tnode *) n; |
Al Viro | 32ab5f8 | 2006-09-26 22:21:45 -0700 | [diff] [blame] | 2329 | __be32 prf = htonl(MASK_PFX(tn->key, tn->pos)); |
Stephen Hemminger | cb7b593 | 2005-09-09 13:35:42 -0700 | [diff] [blame] | 2330 | |
Robert Olsson | 1d25cd6 | 2005-09-19 15:29:52 -0700 | [diff] [blame] | 2331 | seq_indent(seq, iter->depth-1); |
| 2332 | seq_printf(seq, " +-- %d.%d.%d.%d/%d %d %d %d\n", |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 2333 | NIPQUAD(prf), tn->pos, tn->bits, tn->full_children, |
Robert Olsson | 1d25cd6 | 2005-09-19 15:29:52 -0700 | [diff] [blame] | 2334 | tn->empty_children); |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 2335 | |
Olof Johansson | 91b9a27 | 2005-08-09 20:24:39 -0700 | [diff] [blame] | 2336 | } else { |
Stephen Hemminger | cb7b593 | 2005-09-09 13:35:42 -0700 | [diff] [blame] | 2337 | struct leaf *l = (struct leaf *) n; |
| 2338 | int i; |
Al Viro | 32ab5f8 | 2006-09-26 22:21:45 -0700 | [diff] [blame] | 2339 | __be32 val = htonl(l->key); |
Stephen Hemminger | cb7b593 | 2005-09-09 13:35:42 -0700 | [diff] [blame] | 2340 | |
| 2341 | seq_indent(seq, iter->depth); |
| 2342 | seq_printf(seq, " |-- %d.%d.%d.%d\n", NIPQUAD(val)); |
| 2343 | for (i = 32; i >= 0; i--) { |
Robert Olsson | 772cb71 | 2005-09-19 15:31:18 -0700 | [diff] [blame] | 2344 | struct leaf_info *li = find_leaf_info(l, i); |
Stephen Hemminger | cb7b593 | 2005-09-09 13:35:42 -0700 | [diff] [blame] | 2345 | if (li) { |
| 2346 | struct fib_alias *fa; |
| 2347 | list_for_each_entry_rcu(fa, &li->falh, fa_list) { |
| 2348 | seq_indent(seq, iter->depth+1); |
| 2349 | seq_printf(seq, " /%d %s %s", i, |
| 2350 | rtn_scope(fa->fa_scope), |
| 2351 | rtn_type(fa->fa_type)); |
| 2352 | if (fa->fa_tos) |
| 2353 | seq_printf(seq, "tos =%d\n", |
| 2354 | fa->fa_tos); |
| 2355 | seq_putc(seq, '\n'); |
| 2356 | } |
| 2357 | } |
| 2358 | } |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 2359 | } |
| 2360 | |
| 2361 | return 0; |
| 2362 | } |
| 2363 | |
Stephen Hemminger | f690808 | 2007-03-12 14:34:29 -0700 | [diff] [blame] | 2364 | static const struct seq_operations fib_trie_seq_ops = { |
Stephen Hemminger | cb7b593 | 2005-09-09 13:35:42 -0700 | [diff] [blame] | 2365 | .start = fib_trie_seq_start, |
| 2366 | .next = fib_trie_seq_next, |
| 2367 | .stop = fib_trie_seq_stop, |
| 2368 | .show = fib_trie_seq_show, |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 2369 | }; |
| 2370 | |
| 2371 | static int fib_trie_seq_open(struct inode *inode, struct file *file) |
| 2372 | { |
| 2373 | struct seq_file *seq; |
| 2374 | int rc = -ENOMEM; |
Stephen Hemminger | cb7b593 | 2005-09-09 13:35:42 -0700 | [diff] [blame] | 2375 | struct fib_trie_iter *s = kmalloc(sizeof(*s), GFP_KERNEL); |
| 2376 | |
| 2377 | if (!s) |
| 2378 | goto out; |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 2379 | |
| 2380 | rc = seq_open(file, &fib_trie_seq_ops); |
| 2381 | if (rc) |
| 2382 | goto out_kfree; |
| 2383 | |
Stephen Hemminger | cb7b593 | 2005-09-09 13:35:42 -0700 | [diff] [blame] | 2384 | seq = file->private_data; |
| 2385 | seq->private = s; |
| 2386 | memset(s, 0, sizeof(*s)); |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 2387 | out: |
| 2388 | return rc; |
| 2389 | out_kfree: |
Stephen Hemminger | cb7b593 | 2005-09-09 13:35:42 -0700 | [diff] [blame] | 2390 | kfree(s); |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 2391 | goto out; |
| 2392 | } |
| 2393 | |
Arjan van de Ven | 9a32144 | 2007-02-12 00:55:35 -0800 | [diff] [blame] | 2394 | static const struct file_operations fib_trie_fops = { |
Stephen Hemminger | cb7b593 | 2005-09-09 13:35:42 -0700 | [diff] [blame] | 2395 | .owner = THIS_MODULE, |
| 2396 | .open = fib_trie_seq_open, |
| 2397 | .read = seq_read, |
| 2398 | .llseek = seq_lseek, |
| 2399 | .release = seq_release_private, |
| 2400 | }; |
| 2401 | |
Al Viro | 32ab5f8 | 2006-09-26 22:21:45 -0700 | [diff] [blame] | 2402 | static unsigned fib_flag_trans(int type, __be32 mask, const struct fib_info *fi) |
Stephen Hemminger | cb7b593 | 2005-09-09 13:35:42 -0700 | [diff] [blame] | 2403 | { |
| 2404 | static unsigned type2flags[RTN_MAX + 1] = { |
| 2405 | [7] = RTF_REJECT, [8] = RTF_REJECT, |
| 2406 | }; |
| 2407 | unsigned flags = type2flags[type]; |
| 2408 | |
| 2409 | if (fi && fi->fib_nh->nh_gw) |
| 2410 | flags |= RTF_GATEWAY; |
Al Viro | 32ab5f8 | 2006-09-26 22:21:45 -0700 | [diff] [blame] | 2411 | if (mask == htonl(0xFFFFFFFF)) |
Stephen Hemminger | cb7b593 | 2005-09-09 13:35:42 -0700 | [diff] [blame] | 2412 | flags |= RTF_HOST; |
| 2413 | flags |= RTF_UP; |
| 2414 | return flags; |
| 2415 | } |
| 2416 | |
| 2417 | /* |
| 2418 | * This outputs /proc/net/route. |
| 2419 | * The format of the file is not supposed to be changed |
| 2420 | * and needs to be same as fib_hash output to avoid breaking |
| 2421 | * legacy utilities |
| 2422 | */ |
| 2423 | static int fib_route_seq_show(struct seq_file *seq, void *v) |
| 2424 | { |
Patrick McHardy | c9e53cb | 2005-11-20 21:09:00 -0800 | [diff] [blame] | 2425 | const struct fib_trie_iter *iter = seq->private; |
Stephen Hemminger | cb7b593 | 2005-09-09 13:35:42 -0700 | [diff] [blame] | 2426 | struct leaf *l = v; |
| 2427 | int i; |
| 2428 | char bf[128]; |
| 2429 | |
| 2430 | if (v == SEQ_START_TOKEN) { |
| 2431 | seq_printf(seq, "%-127s\n", "Iface\tDestination\tGateway " |
| 2432 | "\tFlags\tRefCnt\tUse\tMetric\tMask\t\tMTU" |
| 2433 | "\tWindow\tIRTT"); |
| 2434 | return 0; |
| 2435 | } |
| 2436 | |
Patrick McHardy | c9e53cb | 2005-11-20 21:09:00 -0800 | [diff] [blame] | 2437 | if (iter->trie == trie_local) |
| 2438 | return 0; |
Stephen Hemminger | cb7b593 | 2005-09-09 13:35:42 -0700 | [diff] [blame] | 2439 | if (IS_TNODE(l)) |
| 2440 | return 0; |
| 2441 | |
| 2442 | for (i=32; i>=0; i--) { |
Robert Olsson | 772cb71 | 2005-09-19 15:31:18 -0700 | [diff] [blame] | 2443 | struct leaf_info *li = find_leaf_info(l, i); |
Stephen Hemminger | cb7b593 | 2005-09-09 13:35:42 -0700 | [diff] [blame] | 2444 | struct fib_alias *fa; |
Al Viro | 32ab5f8 | 2006-09-26 22:21:45 -0700 | [diff] [blame] | 2445 | __be32 mask, prefix; |
Stephen Hemminger | cb7b593 | 2005-09-09 13:35:42 -0700 | [diff] [blame] | 2446 | |
| 2447 | if (!li) |
| 2448 | continue; |
| 2449 | |
| 2450 | mask = inet_make_mask(li->plen); |
| 2451 | prefix = htonl(l->key); |
| 2452 | |
| 2453 | list_for_each_entry_rcu(fa, &li->falh, fa_list) { |
Herbert Xu | 1371e37 | 2005-10-15 09:42:39 +1000 | [diff] [blame] | 2454 | const struct fib_info *fi = fa->fa_info; |
Stephen Hemminger | cb7b593 | 2005-09-09 13:35:42 -0700 | [diff] [blame] | 2455 | unsigned flags = fib_flag_trans(fa->fa_type, mask, fi); |
| 2456 | |
| 2457 | if (fa->fa_type == RTN_BROADCAST |
| 2458 | || fa->fa_type == RTN_MULTICAST) |
| 2459 | continue; |
| 2460 | |
| 2461 | if (fi) |
| 2462 | snprintf(bf, sizeof(bf), |
| 2463 | "%s\t%08X\t%08X\t%04X\t%d\t%u\t%d\t%08X\t%d\t%u\t%u", |
| 2464 | fi->fib_dev ? fi->fib_dev->name : "*", |
| 2465 | prefix, |
| 2466 | fi->fib_nh->nh_gw, flags, 0, 0, |
| 2467 | fi->fib_priority, |
| 2468 | mask, |
| 2469 | (fi->fib_advmss ? fi->fib_advmss + 40 : 0), |
| 2470 | fi->fib_window, |
| 2471 | fi->fib_rtt >> 3); |
| 2472 | else |
| 2473 | snprintf(bf, sizeof(bf), |
| 2474 | "*\t%08X\t%08X\t%04X\t%d\t%u\t%d\t%08X\t%d\t%u\t%u", |
| 2475 | prefix, 0, flags, 0, 0, 0, |
| 2476 | mask, 0, 0, 0); |
| 2477 | |
| 2478 | seq_printf(seq, "%-127s\n", bf); |
| 2479 | } |
| 2480 | } |
| 2481 | |
| 2482 | return 0; |
| 2483 | } |
| 2484 | |
Stephen Hemminger | f690808 | 2007-03-12 14:34:29 -0700 | [diff] [blame] | 2485 | static const struct seq_operations fib_route_seq_ops = { |
Stephen Hemminger | cb7b593 | 2005-09-09 13:35:42 -0700 | [diff] [blame] | 2486 | .start = fib_trie_seq_start, |
| 2487 | .next = fib_trie_seq_next, |
| 2488 | .stop = fib_trie_seq_stop, |
| 2489 | .show = fib_route_seq_show, |
| 2490 | }; |
| 2491 | |
| 2492 | static int fib_route_seq_open(struct inode *inode, struct file *file) |
| 2493 | { |
| 2494 | struct seq_file *seq; |
| 2495 | int rc = -ENOMEM; |
| 2496 | struct fib_trie_iter *s = kmalloc(sizeof(*s), GFP_KERNEL); |
| 2497 | |
| 2498 | if (!s) |
| 2499 | goto out; |
| 2500 | |
| 2501 | rc = seq_open(file, &fib_route_seq_ops); |
| 2502 | if (rc) |
| 2503 | goto out_kfree; |
| 2504 | |
| 2505 | seq = file->private_data; |
| 2506 | seq->private = s; |
| 2507 | memset(s, 0, sizeof(*s)); |
| 2508 | out: |
| 2509 | return rc; |
| 2510 | out_kfree: |
| 2511 | kfree(s); |
| 2512 | goto out; |
| 2513 | } |
| 2514 | |
Arjan van de Ven | 9a32144 | 2007-02-12 00:55:35 -0800 | [diff] [blame] | 2515 | static const struct file_operations fib_route_fops = { |
Stephen Hemminger | cb7b593 | 2005-09-09 13:35:42 -0700 | [diff] [blame] | 2516 | .owner = THIS_MODULE, |
| 2517 | .open = fib_route_seq_open, |
| 2518 | .read = seq_read, |
| 2519 | .llseek = seq_lseek, |
| 2520 | .release = seq_release_private, |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 2521 | }; |
| 2522 | |
| 2523 | int __init fib_proc_init(void) |
| 2524 | { |
Stephen Hemminger | cb7b593 | 2005-09-09 13:35:42 -0700 | [diff] [blame] | 2525 | if (!proc_net_fops_create("fib_trie", S_IRUGO, &fib_trie_fops)) |
| 2526 | goto out1; |
| 2527 | |
| 2528 | if (!proc_net_fops_create("fib_triestat", S_IRUGO, &fib_triestat_fops)) |
| 2529 | goto out2; |
| 2530 | |
| 2531 | if (!proc_net_fops_create("route", S_IRUGO, &fib_route_fops)) |
| 2532 | goto out3; |
| 2533 | |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 2534 | return 0; |
Stephen Hemminger | cb7b593 | 2005-09-09 13:35:42 -0700 | [diff] [blame] | 2535 | |
| 2536 | out3: |
| 2537 | proc_net_remove("fib_triestat"); |
| 2538 | out2: |
| 2539 | proc_net_remove("fib_trie"); |
| 2540 | out1: |
| 2541 | return -ENOMEM; |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 2542 | } |
| 2543 | |
| 2544 | void __init fib_proc_exit(void) |
| 2545 | { |
| 2546 | proc_net_remove("fib_trie"); |
Stephen Hemminger | cb7b593 | 2005-09-09 13:35:42 -0700 | [diff] [blame] | 2547 | proc_net_remove("fib_triestat"); |
| 2548 | proc_net_remove("route"); |
Robert Olsson | 19baf83 | 2005-06-21 12:43:18 -0700 | [diff] [blame] | 2549 | } |
| 2550 | |
| 2551 | #endif /* CONFIG_PROC_FS */ |