Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 2 | * Linux INET6 implementation |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3 | * Forwarding Information Database |
| 4 | * |
| 5 | * Authors: |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 6 | * Pedro Roque <roque@di.fc.ul.pt> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 7 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | * This program is free software; you can redistribute it and/or |
| 9 | * modify it under the terms of the GNU General Public License |
| 10 | * as published by the Free Software Foundation; either version |
| 11 | * 2 of the License, or (at your option) any later version. |
| 12 | */ |
| 13 | |
| 14 | /* |
| 15 | * Changes: |
| 16 | * Yuji SEKIYA @USAGI: Support default route on router node; |
| 17 | * remove ip6_null_entry from the top of |
| 18 | * routing table. |
YOSHIFUJI Hideaki | c0bece9 | 2006-08-23 17:23:25 -0700 | [diff] [blame] | 19 | * Ville Nuorvala: Fixed routing subtrees. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | */ |
Joe Perches | f321383 | 2012-05-15 14:11:53 +0000 | [diff] [blame] | 21 | |
| 22 | #define pr_fmt(fmt) "IPv6: " fmt |
| 23 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | #include <linux/errno.h> |
| 25 | #include <linux/types.h> |
| 26 | #include <linux/net.h> |
| 27 | #include <linux/route.h> |
| 28 | #include <linux/netdevice.h> |
| 29 | #include <linux/in6.h> |
| 30 | #include <linux/init.h> |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 31 | #include <linux/list.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 32 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | #include <net/ipv6.h> |
| 35 | #include <net/ndisc.h> |
| 36 | #include <net/addrconf.h> |
| 37 | |
| 38 | #include <net/ip6_fib.h> |
| 39 | #include <net/ip6_route.h> |
| 40 | |
| 41 | #define RT6_DEBUG 2 |
| 42 | |
| 43 | #if RT6_DEBUG >= 3 |
Joe Perches | 91df42b | 2012-05-15 14:11:54 +0000 | [diff] [blame] | 44 | #define RT6_TRACE(x...) pr_debug(x) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | #else |
| 46 | #define RT6_TRACE(x...) do { ; } while (0) |
| 47 | #endif |
| 48 | |
Christoph Lameter | e18b890 | 2006-12-06 20:33:20 -0800 | [diff] [blame] | 49 | static struct kmem_cache * fib6_node_kmem __read_mostly; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | |
| 51 | enum fib_walk_state_t |
| 52 | { |
| 53 | #ifdef CONFIG_IPV6_SUBTREES |
| 54 | FWS_S, |
| 55 | #endif |
| 56 | FWS_L, |
| 57 | FWS_R, |
| 58 | FWS_C, |
| 59 | FWS_U |
| 60 | }; |
| 61 | |
| 62 | struct fib6_cleaner_t |
| 63 | { |
| 64 | struct fib6_walker_t w; |
Benjamin Thery | ec7d43c | 2008-03-03 23:31:57 -0800 | [diff] [blame] | 65 | struct net *net; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | int (*func)(struct rt6_info *, void *arg); |
| 67 | void *arg; |
| 68 | }; |
| 69 | |
Adrian Bunk | 90d4112 | 2006-08-14 23:49:16 -0700 | [diff] [blame] | 70 | static DEFINE_RWLOCK(fib6_walker_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | |
| 72 | #ifdef CONFIG_IPV6_SUBTREES |
| 73 | #define FWS_INIT FWS_S |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | #else |
| 75 | #define FWS_INIT FWS_L |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | #endif |
| 77 | |
Benjamin Thery | ec7d43c | 2008-03-03 23:31:57 -0800 | [diff] [blame] | 78 | static void fib6_prune_clones(struct net *net, struct fib6_node *fn, |
| 79 | struct rt6_info *rt); |
Daniel Lezcano | 8ed6778 | 2008-03-04 13:48:30 -0800 | [diff] [blame] | 80 | static struct rt6_info *fib6_find_prefix(struct net *net, struct fib6_node *fn); |
| 81 | static struct fib6_node *fib6_repair_tree(struct net *net, struct fib6_node *fn); |
Adrian Bunk | 90d4112 | 2006-08-14 23:49:16 -0700 | [diff] [blame] | 82 | static int fib6_walk(struct fib6_walker_t *w); |
| 83 | static int fib6_walk_continue(struct fib6_walker_t *w); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | |
| 85 | /* |
| 86 | * A routing update causes an increase of the serial number on the |
| 87 | * affected subtree. This allows for cached routes to be asynchronously |
| 88 | * tested when modifications are made to the destination cache as a |
| 89 | * result of redirects, path MTU changes, etc. |
| 90 | */ |
| 91 | |
| 92 | static __u32 rt_sernum; |
| 93 | |
Daniel Lezcano | 5b7c931 | 2008-03-03 23:28:58 -0800 | [diff] [blame] | 94 | static void fib6_gc_timer_cb(unsigned long arg); |
| 95 | |
Alexey Dobriyan | bbef49d | 2010-02-18 08:13:30 +0000 | [diff] [blame] | 96 | static LIST_HEAD(fib6_walkers); |
| 97 | #define FOR_WALKERS(w) list_for_each_entry(w, &fib6_walkers, lh) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | |
Adrian Bunk | 90d4112 | 2006-08-14 23:49:16 -0700 | [diff] [blame] | 99 | static inline void fib6_walker_link(struct fib6_walker_t *w) |
| 100 | { |
| 101 | write_lock_bh(&fib6_walker_lock); |
Alexey Dobriyan | bbef49d | 2010-02-18 08:13:30 +0000 | [diff] [blame] | 102 | list_add(&w->lh, &fib6_walkers); |
Adrian Bunk | 90d4112 | 2006-08-14 23:49:16 -0700 | [diff] [blame] | 103 | write_unlock_bh(&fib6_walker_lock); |
| 104 | } |
| 105 | |
| 106 | static inline void fib6_walker_unlink(struct fib6_walker_t *w) |
| 107 | { |
| 108 | write_lock_bh(&fib6_walker_lock); |
Alexey Dobriyan | bbef49d | 2010-02-18 08:13:30 +0000 | [diff] [blame] | 109 | list_del(&w->lh); |
Adrian Bunk | 90d4112 | 2006-08-14 23:49:16 -0700 | [diff] [blame] | 110 | write_unlock_bh(&fib6_walker_lock); |
| 111 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | static __inline__ u32 fib6_new_sernum(void) |
| 113 | { |
| 114 | u32 n = ++rt_sernum; |
| 115 | if ((__s32)n <= 0) |
| 116 | rt_sernum = n = 1; |
| 117 | return n; |
| 118 | } |
| 119 | |
| 120 | /* |
| 121 | * Auxiliary address test functions for the radix tree. |
| 122 | * |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 123 | * These assume a 32bit processor (although it will work on |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | * 64bit processors) |
| 125 | */ |
| 126 | |
| 127 | /* |
| 128 | * test bit |
| 129 | */ |
YOSHIFUJI Hideaki / 吉藤英明 | 02cdce5 | 2010-03-27 01:24:16 +0000 | [diff] [blame] | 130 | #if defined(__LITTLE_ENDIAN) |
| 131 | # define BITOP_BE32_SWIZZLE (0x1F & ~7) |
| 132 | #else |
| 133 | # define BITOP_BE32_SWIZZLE 0 |
| 134 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 135 | |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 136 | static __inline__ __be32 addr_bit_set(const void *token, int fn_bit) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 137 | { |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 138 | const __be32 *addr = token; |
YOSHIFUJI Hideaki / 吉藤英明 | 02cdce5 | 2010-03-27 01:24:16 +0000 | [diff] [blame] | 139 | /* |
| 140 | * Here, |
| 141 | * 1 << ((~fn_bit ^ BITOP_BE32_SWIZZLE) & 0x1f) |
| 142 | * is optimized version of |
| 143 | * htonl(1 << ((~fn_bit)&0x1F)) |
| 144 | * See include/asm-generic/bitops/le.h. |
| 145 | */ |
Eric Dumazet | 0eae88f | 2010-04-20 19:06:52 -0700 | [diff] [blame] | 146 | return (__force __be32)(1 << ((~fn_bit ^ BITOP_BE32_SWIZZLE) & 0x1f)) & |
| 147 | addr[fn_bit >> 5]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | } |
| 149 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 150 | static __inline__ struct fib6_node * node_alloc(void) |
| 151 | { |
| 152 | struct fib6_node *fn; |
| 153 | |
Robert P. J. Day | c376222 | 2007-02-10 01:45:03 -0800 | [diff] [blame] | 154 | fn = kmem_cache_zalloc(fib6_node_kmem, GFP_ATOMIC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | |
| 156 | return fn; |
| 157 | } |
| 158 | |
| 159 | static __inline__ void node_free(struct fib6_node * fn) |
| 160 | { |
| 161 | kmem_cache_free(fib6_node_kmem, fn); |
| 162 | } |
| 163 | |
| 164 | static __inline__ void rt6_release(struct rt6_info *rt) |
| 165 | { |
| 166 | if (atomic_dec_and_test(&rt->rt6i_ref)) |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 167 | dst_free(&rt->dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | } |
| 169 | |
Daniel Lezcano | 58f09b7 | 2008-03-03 23:25:27 -0800 | [diff] [blame] | 170 | static void fib6_link_table(struct net *net, struct fib6_table *tb) |
Patrick McHardy | 1b43af5 | 2006-08-10 23:11:17 -0700 | [diff] [blame] | 171 | { |
| 172 | unsigned int h; |
| 173 | |
Thomas Graf | 375216a | 2006-10-21 20:20:54 -0700 | [diff] [blame] | 174 | /* |
| 175 | * Initialize table lock at a single place to give lockdep a key, |
| 176 | * tables aren't visible prior to being linked to the list. |
| 177 | */ |
| 178 | rwlock_init(&tb->tb6_lock); |
| 179 | |
Neil Horman | a33bc5c | 2009-07-30 18:52:15 -0700 | [diff] [blame] | 180 | h = tb->tb6_id & (FIB6_TABLE_HASHSZ - 1); |
Patrick McHardy | 1b43af5 | 2006-08-10 23:11:17 -0700 | [diff] [blame] | 181 | |
| 182 | /* |
| 183 | * No protection necessary, this is the only list mutatation |
| 184 | * operation, tables never disappear once they exist. |
| 185 | */ |
Daniel Lezcano | 58f09b7 | 2008-03-03 23:25:27 -0800 | [diff] [blame] | 186 | hlist_add_head_rcu(&tb->tb6_hlist, &net->ipv6.fib_table_hash[h]); |
Patrick McHardy | 1b43af5 | 2006-08-10 23:11:17 -0700 | [diff] [blame] | 187 | } |
| 188 | |
| 189 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
Daniel Lezcano | e0b85590 | 2008-03-03 23:24:31 -0800 | [diff] [blame] | 190 | |
Daniel Lezcano | 8ed6778 | 2008-03-04 13:48:30 -0800 | [diff] [blame] | 191 | static struct fib6_table *fib6_alloc_table(struct net *net, u32 id) |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 192 | { |
| 193 | struct fib6_table *table; |
| 194 | |
| 195 | table = kzalloc(sizeof(*table), GFP_ATOMIC); |
David S. Miller | 507c9b1 | 2011-12-03 17:50:45 -0500 | [diff] [blame] | 196 | if (table) { |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 197 | table->tb6_id = id; |
Daniel Lezcano | 8ed6778 | 2008-03-04 13:48:30 -0800 | [diff] [blame] | 198 | table->tb6_root.leaf = net->ipv6.ip6_null_entry; |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 199 | table->tb6_root.fn_flags = RTN_ROOT | RTN_TL_ROOT | RTN_RTINFO; |
David S. Miller | 8e77327 | 2012-06-11 00:01:52 -0700 | [diff] [blame] | 200 | inet_peer_base_init(&table->tb6_peers); |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 201 | } |
| 202 | |
| 203 | return table; |
| 204 | } |
| 205 | |
Daniel Lezcano | 58f09b7 | 2008-03-03 23:25:27 -0800 | [diff] [blame] | 206 | struct fib6_table *fib6_new_table(struct net *net, u32 id) |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 207 | { |
| 208 | struct fib6_table *tb; |
| 209 | |
| 210 | if (id == 0) |
| 211 | id = RT6_TABLE_MAIN; |
Daniel Lezcano | 58f09b7 | 2008-03-03 23:25:27 -0800 | [diff] [blame] | 212 | tb = fib6_get_table(net, id); |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 213 | if (tb) |
| 214 | return tb; |
| 215 | |
Daniel Lezcano | 8ed6778 | 2008-03-04 13:48:30 -0800 | [diff] [blame] | 216 | tb = fib6_alloc_table(net, id); |
David S. Miller | 507c9b1 | 2011-12-03 17:50:45 -0500 | [diff] [blame] | 217 | if (tb) |
Daniel Lezcano | 58f09b7 | 2008-03-03 23:25:27 -0800 | [diff] [blame] | 218 | fib6_link_table(net, tb); |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 219 | |
| 220 | return tb; |
| 221 | } |
| 222 | |
Daniel Lezcano | 58f09b7 | 2008-03-03 23:25:27 -0800 | [diff] [blame] | 223 | struct fib6_table *fib6_get_table(struct net *net, u32 id) |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 224 | { |
| 225 | struct fib6_table *tb; |
Daniel Lezcano | 58f09b7 | 2008-03-03 23:25:27 -0800 | [diff] [blame] | 226 | struct hlist_head *head; |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 227 | struct hlist_node *node; |
| 228 | unsigned int h; |
| 229 | |
| 230 | if (id == 0) |
| 231 | id = RT6_TABLE_MAIN; |
Neil Horman | a33bc5c | 2009-07-30 18:52:15 -0700 | [diff] [blame] | 232 | h = id & (FIB6_TABLE_HASHSZ - 1); |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 233 | rcu_read_lock(); |
Daniel Lezcano | 58f09b7 | 2008-03-03 23:25:27 -0800 | [diff] [blame] | 234 | head = &net->ipv6.fib_table_hash[h]; |
| 235 | hlist_for_each_entry_rcu(tb, node, head, tb6_hlist) { |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 236 | if (tb->tb6_id == id) { |
| 237 | rcu_read_unlock(); |
| 238 | return tb; |
| 239 | } |
| 240 | } |
| 241 | rcu_read_unlock(); |
| 242 | |
| 243 | return NULL; |
| 244 | } |
| 245 | |
Alexey Dobriyan | 2c8c1e7 | 2010-01-17 03:35:32 +0000 | [diff] [blame] | 246 | static void __net_init fib6_tables_init(struct net *net) |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 247 | { |
Daniel Lezcano | 58f09b7 | 2008-03-03 23:25:27 -0800 | [diff] [blame] | 248 | fib6_link_table(net, net->ipv6.fib6_main_tbl); |
| 249 | fib6_link_table(net, net->ipv6.fib6_local_tbl); |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 250 | } |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 251 | #else |
| 252 | |
Daniel Lezcano | 58f09b7 | 2008-03-03 23:25:27 -0800 | [diff] [blame] | 253 | struct fib6_table *fib6_new_table(struct net *net, u32 id) |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 254 | { |
Daniel Lezcano | 58f09b7 | 2008-03-03 23:25:27 -0800 | [diff] [blame] | 255 | return fib6_get_table(net, id); |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 256 | } |
| 257 | |
Daniel Lezcano | 58f09b7 | 2008-03-03 23:25:27 -0800 | [diff] [blame] | 258 | struct fib6_table *fib6_get_table(struct net *net, u32 id) |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 259 | { |
Daniel Lezcano | 58f09b7 | 2008-03-03 23:25:27 -0800 | [diff] [blame] | 260 | return net->ipv6.fib6_main_tbl; |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 261 | } |
| 262 | |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 263 | struct dst_entry *fib6_rule_lookup(struct net *net, struct flowi6 *fl6, |
Daniel Lezcano | 58f09b7 | 2008-03-03 23:25:27 -0800 | [diff] [blame] | 264 | int flags, pol_lookup_t lookup) |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 265 | { |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 266 | return (struct dst_entry *) lookup(net, net->ipv6.fib6_main_tbl, fl6, flags); |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 267 | } |
| 268 | |
Alexey Dobriyan | 2c8c1e7 | 2010-01-17 03:35:32 +0000 | [diff] [blame] | 269 | static void __net_init fib6_tables_init(struct net *net) |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 270 | { |
Daniel Lezcano | 58f09b7 | 2008-03-03 23:25:27 -0800 | [diff] [blame] | 271 | fib6_link_table(net, net->ipv6.fib6_main_tbl); |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 272 | } |
| 273 | |
| 274 | #endif |
| 275 | |
Patrick McHardy | 1b43af5 | 2006-08-10 23:11:17 -0700 | [diff] [blame] | 276 | static int fib6_dump_node(struct fib6_walker_t *w) |
| 277 | { |
| 278 | int res; |
| 279 | struct rt6_info *rt; |
| 280 | |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 281 | for (rt = w->leaf; rt; rt = rt->dst.rt6_next) { |
Patrick McHardy | 1b43af5 | 2006-08-10 23:11:17 -0700 | [diff] [blame] | 282 | res = rt6_dump_route(rt, w->args); |
| 283 | if (res < 0) { |
| 284 | /* Frame is full, suspend walking */ |
| 285 | w->leaf = rt; |
| 286 | return 1; |
| 287 | } |
Ilpo Järvinen | 547b792 | 2008-07-25 21:43:18 -0700 | [diff] [blame] | 288 | WARN_ON(res == 0); |
Patrick McHardy | 1b43af5 | 2006-08-10 23:11:17 -0700 | [diff] [blame] | 289 | } |
| 290 | w->leaf = NULL; |
| 291 | return 0; |
| 292 | } |
| 293 | |
| 294 | static void fib6_dump_end(struct netlink_callback *cb) |
| 295 | { |
| 296 | struct fib6_walker_t *w = (void*)cb->args[2]; |
| 297 | |
| 298 | if (w) { |
Herbert Xu | 7891cc8 | 2009-01-13 22:17:51 -0800 | [diff] [blame] | 299 | if (cb->args[4]) { |
| 300 | cb->args[4] = 0; |
| 301 | fib6_walker_unlink(w); |
| 302 | } |
Patrick McHardy | 1b43af5 | 2006-08-10 23:11:17 -0700 | [diff] [blame] | 303 | cb->args[2] = 0; |
| 304 | kfree(w); |
| 305 | } |
| 306 | cb->done = (void*)cb->args[3]; |
| 307 | cb->args[1] = 3; |
| 308 | } |
| 309 | |
| 310 | static int fib6_dump_done(struct netlink_callback *cb) |
| 311 | { |
| 312 | fib6_dump_end(cb); |
| 313 | return cb->done ? cb->done(cb) : 0; |
| 314 | } |
| 315 | |
| 316 | static int fib6_dump_table(struct fib6_table *table, struct sk_buff *skb, |
| 317 | struct netlink_callback *cb) |
| 318 | { |
| 319 | struct fib6_walker_t *w; |
| 320 | int res; |
| 321 | |
| 322 | w = (void *)cb->args[2]; |
| 323 | w->root = &table->tb6_root; |
| 324 | |
| 325 | if (cb->args[4] == 0) { |
Patrick McHardy | 2bec5a3 | 2010-02-08 05:19:03 +0000 | [diff] [blame] | 326 | w->count = 0; |
| 327 | w->skip = 0; |
| 328 | |
Patrick McHardy | 1b43af5 | 2006-08-10 23:11:17 -0700 | [diff] [blame] | 329 | read_lock_bh(&table->tb6_lock); |
| 330 | res = fib6_walk(w); |
| 331 | read_unlock_bh(&table->tb6_lock); |
Patrick McHardy | 2bec5a3 | 2010-02-08 05:19:03 +0000 | [diff] [blame] | 332 | if (res > 0) { |
Patrick McHardy | 1b43af5 | 2006-08-10 23:11:17 -0700 | [diff] [blame] | 333 | cb->args[4] = 1; |
Patrick McHardy | 2bec5a3 | 2010-02-08 05:19:03 +0000 | [diff] [blame] | 334 | cb->args[5] = w->root->fn_sernum; |
| 335 | } |
Patrick McHardy | 1b43af5 | 2006-08-10 23:11:17 -0700 | [diff] [blame] | 336 | } else { |
Patrick McHardy | 2bec5a3 | 2010-02-08 05:19:03 +0000 | [diff] [blame] | 337 | if (cb->args[5] != w->root->fn_sernum) { |
| 338 | /* Begin at the root if the tree changed */ |
| 339 | cb->args[5] = w->root->fn_sernum; |
| 340 | w->state = FWS_INIT; |
| 341 | w->node = w->root; |
| 342 | w->skip = w->count; |
| 343 | } else |
| 344 | w->skip = 0; |
| 345 | |
Patrick McHardy | 1b43af5 | 2006-08-10 23:11:17 -0700 | [diff] [blame] | 346 | read_lock_bh(&table->tb6_lock); |
| 347 | res = fib6_walk_continue(w); |
| 348 | read_unlock_bh(&table->tb6_lock); |
Herbert Xu | 7891cc8 | 2009-01-13 22:17:51 -0800 | [diff] [blame] | 349 | if (res <= 0) { |
| 350 | fib6_walker_unlink(w); |
| 351 | cb->args[4] = 0; |
Patrick McHardy | 1b43af5 | 2006-08-10 23:11:17 -0700 | [diff] [blame] | 352 | } |
Patrick McHardy | 1b43af5 | 2006-08-10 23:11:17 -0700 | [diff] [blame] | 353 | } |
Herbert Xu | 7891cc8 | 2009-01-13 22:17:51 -0800 | [diff] [blame] | 354 | |
Patrick McHardy | 1b43af5 | 2006-08-10 23:11:17 -0700 | [diff] [blame] | 355 | return res; |
| 356 | } |
| 357 | |
Thomas Graf | c127ea2 | 2007-03-22 11:58:32 -0700 | [diff] [blame] | 358 | static int inet6_dump_fib(struct sk_buff *skb, struct netlink_callback *cb) |
Patrick McHardy | 1b43af5 | 2006-08-10 23:11:17 -0700 | [diff] [blame] | 359 | { |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 360 | struct net *net = sock_net(skb->sk); |
Patrick McHardy | 1b43af5 | 2006-08-10 23:11:17 -0700 | [diff] [blame] | 361 | unsigned int h, s_h; |
| 362 | unsigned int e = 0, s_e; |
| 363 | struct rt6_rtnl_dump_arg arg; |
| 364 | struct fib6_walker_t *w; |
| 365 | struct fib6_table *tb; |
| 366 | struct hlist_node *node; |
Daniel Lezcano | 58f09b7 | 2008-03-03 23:25:27 -0800 | [diff] [blame] | 367 | struct hlist_head *head; |
Patrick McHardy | 1b43af5 | 2006-08-10 23:11:17 -0700 | [diff] [blame] | 368 | int res = 0; |
| 369 | |
| 370 | s_h = cb->args[0]; |
| 371 | s_e = cb->args[1]; |
| 372 | |
| 373 | w = (void *)cb->args[2]; |
David S. Miller | 507c9b1 | 2011-12-03 17:50:45 -0500 | [diff] [blame] | 374 | if (!w) { |
Patrick McHardy | 1b43af5 | 2006-08-10 23:11:17 -0700 | [diff] [blame] | 375 | /* New dump: |
| 376 | * |
| 377 | * 1. hook callback destructor. |
| 378 | */ |
| 379 | cb->args[3] = (long)cb->done; |
| 380 | cb->done = fib6_dump_done; |
| 381 | |
| 382 | /* |
| 383 | * 2. allocate and initialize walker. |
| 384 | */ |
| 385 | w = kzalloc(sizeof(*w), GFP_ATOMIC); |
David S. Miller | 507c9b1 | 2011-12-03 17:50:45 -0500 | [diff] [blame] | 386 | if (!w) |
Patrick McHardy | 1b43af5 | 2006-08-10 23:11:17 -0700 | [diff] [blame] | 387 | return -ENOMEM; |
| 388 | w->func = fib6_dump_node; |
| 389 | cb->args[2] = (long)w; |
| 390 | } |
| 391 | |
| 392 | arg.skb = skb; |
| 393 | arg.cb = cb; |
Brian Haley | 191cd58 | 2008-08-14 15:33:21 -0700 | [diff] [blame] | 394 | arg.net = net; |
Patrick McHardy | 1b43af5 | 2006-08-10 23:11:17 -0700 | [diff] [blame] | 395 | w->args = &arg; |
| 396 | |
Eric Dumazet | e67f88d | 2011-04-27 22:56:07 +0000 | [diff] [blame] | 397 | rcu_read_lock(); |
Neil Horman | a33bc5c | 2009-07-30 18:52:15 -0700 | [diff] [blame] | 398 | for (h = s_h; h < FIB6_TABLE_HASHSZ; h++, s_e = 0) { |
Patrick McHardy | 1b43af5 | 2006-08-10 23:11:17 -0700 | [diff] [blame] | 399 | e = 0; |
Daniel Lezcano | 58f09b7 | 2008-03-03 23:25:27 -0800 | [diff] [blame] | 400 | head = &net->ipv6.fib_table_hash[h]; |
Eric Dumazet | e67f88d | 2011-04-27 22:56:07 +0000 | [diff] [blame] | 401 | hlist_for_each_entry_rcu(tb, node, head, tb6_hlist) { |
Patrick McHardy | 1b43af5 | 2006-08-10 23:11:17 -0700 | [diff] [blame] | 402 | if (e < s_e) |
| 403 | goto next; |
| 404 | res = fib6_dump_table(tb, skb, cb); |
| 405 | if (res != 0) |
| 406 | goto out; |
| 407 | next: |
| 408 | e++; |
| 409 | } |
| 410 | } |
| 411 | out: |
Eric Dumazet | e67f88d | 2011-04-27 22:56:07 +0000 | [diff] [blame] | 412 | rcu_read_unlock(); |
Patrick McHardy | 1b43af5 | 2006-08-10 23:11:17 -0700 | [diff] [blame] | 413 | cb->args[1] = e; |
| 414 | cb->args[0] = h; |
| 415 | |
| 416 | res = res < 0 ? res : skb->len; |
| 417 | if (res <= 0) |
| 418 | fib6_dump_end(cb); |
| 419 | return res; |
| 420 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 421 | |
| 422 | /* |
| 423 | * Routing Table |
| 424 | * |
| 425 | * return the appropriate node for a routing tree "add" operation |
| 426 | * by either creating and inserting or by returning an existing |
| 427 | * node. |
| 428 | */ |
| 429 | |
| 430 | static struct fib6_node * fib6_add_1(struct fib6_node *root, void *addr, |
| 431 | int addrlen, int plen, |
Matti Vaittinen | 4a287eb | 2011-11-14 00:15:14 +0000 | [diff] [blame] | 432 | int offset, int allow_create, |
| 433 | int replace_required) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 434 | { |
| 435 | struct fib6_node *fn, *in, *ln; |
| 436 | struct fib6_node *pn = NULL; |
| 437 | struct rt6key *key; |
| 438 | int bit; |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 439 | __be32 dir = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 440 | __u32 sernum = fib6_new_sernum(); |
| 441 | |
| 442 | RT6_TRACE("fib6_add_1\n"); |
| 443 | |
| 444 | /* insert node in tree */ |
| 445 | |
| 446 | fn = root; |
| 447 | |
| 448 | do { |
| 449 | key = (struct rt6key *)((u8 *)fn->leaf + offset); |
| 450 | |
| 451 | /* |
| 452 | * Prefix match |
| 453 | */ |
| 454 | if (plen < fn->fn_bit || |
Matti Vaittinen | 4a287eb | 2011-11-14 00:15:14 +0000 | [diff] [blame] | 455 | !ipv6_prefix_equal(&key->addr, addr, fn->fn_bit)) { |
Matti Vaittinen | 14df015 | 2011-11-16 21:18:02 +0000 | [diff] [blame] | 456 | if (!allow_create) { |
| 457 | if (replace_required) { |
Joe Perches | f321383 | 2012-05-15 14:11:53 +0000 | [diff] [blame] | 458 | pr_warn("Can't replace route, no match found\n"); |
Matti Vaittinen | 14df015 | 2011-11-16 21:18:02 +0000 | [diff] [blame] | 459 | return ERR_PTR(-ENOENT); |
| 460 | } |
Joe Perches | f321383 | 2012-05-15 14:11:53 +0000 | [diff] [blame] | 461 | pr_warn("NLM_F_CREATE should be set when creating new route\n"); |
Matti Vaittinen | 14df015 | 2011-11-16 21:18:02 +0000 | [diff] [blame] | 462 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 463 | goto insert_above; |
Matti Vaittinen | 4a287eb | 2011-11-14 00:15:14 +0000 | [diff] [blame] | 464 | } |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 465 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 466 | /* |
| 467 | * Exact match ? |
| 468 | */ |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 469 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 470 | if (plen == fn->fn_bit) { |
| 471 | /* clean up an intermediate node */ |
David S. Miller | 507c9b1 | 2011-12-03 17:50:45 -0500 | [diff] [blame] | 472 | if (!(fn->fn_flags & RTN_RTINFO)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 473 | rt6_release(fn->leaf); |
| 474 | fn->leaf = NULL; |
| 475 | } |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 476 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 477 | fn->fn_sernum = sernum; |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 478 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 479 | return fn; |
| 480 | } |
| 481 | |
| 482 | /* |
| 483 | * We have more bits to go |
| 484 | */ |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 485 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 486 | /* Try to walk down on tree. */ |
| 487 | fn->fn_sernum = sernum; |
| 488 | dir = addr_bit_set(addr, fn->fn_bit); |
| 489 | pn = fn; |
| 490 | fn = dir ? fn->right: fn->left; |
| 491 | } while (fn); |
| 492 | |
Matti Vaittinen | 14df015 | 2011-11-16 21:18:02 +0000 | [diff] [blame] | 493 | if (!allow_create) { |
Matti Vaittinen | 4a287eb | 2011-11-14 00:15:14 +0000 | [diff] [blame] | 494 | /* We should not create new node because |
| 495 | * NLM_F_REPLACE was specified without NLM_F_CREATE |
| 496 | * I assume it is safe to require NLM_F_CREATE when |
| 497 | * REPLACE flag is used! Later we may want to remove the |
| 498 | * check for replace_required, because according |
| 499 | * to netlink specification, NLM_F_CREATE |
| 500 | * MUST be specified if new route is created. |
| 501 | * That would keep IPv6 consistent with IPv4 |
| 502 | */ |
Matti Vaittinen | 14df015 | 2011-11-16 21:18:02 +0000 | [diff] [blame] | 503 | if (replace_required) { |
Joe Perches | f321383 | 2012-05-15 14:11:53 +0000 | [diff] [blame] | 504 | pr_warn("Can't replace route, no match found\n"); |
Matti Vaittinen | 14df015 | 2011-11-16 21:18:02 +0000 | [diff] [blame] | 505 | return ERR_PTR(-ENOENT); |
| 506 | } |
Joe Perches | f321383 | 2012-05-15 14:11:53 +0000 | [diff] [blame] | 507 | pr_warn("NLM_F_CREATE should be set when creating new route\n"); |
Matti Vaittinen | 4a287eb | 2011-11-14 00:15:14 +0000 | [diff] [blame] | 508 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 509 | /* |
| 510 | * We walked to the bottom of tree. |
| 511 | * Create new leaf node without children. |
| 512 | */ |
| 513 | |
| 514 | ln = node_alloc(); |
| 515 | |
David S. Miller | 507c9b1 | 2011-12-03 17:50:45 -0500 | [diff] [blame] | 516 | if (!ln) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 517 | return NULL; |
| 518 | ln->fn_bit = plen; |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 519 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 520 | ln->parent = pn; |
| 521 | ln->fn_sernum = sernum; |
| 522 | |
| 523 | if (dir) |
| 524 | pn->right = ln; |
| 525 | else |
| 526 | pn->left = ln; |
| 527 | |
| 528 | return ln; |
| 529 | |
| 530 | |
| 531 | insert_above: |
| 532 | /* |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 533 | * split since we don't have a common prefix anymore or |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 534 | * we have a less significant route. |
| 535 | * we've to insert an intermediate node on the list |
| 536 | * this new node will point to the one we need to create |
| 537 | * and the current |
| 538 | */ |
| 539 | |
| 540 | pn = fn->parent; |
| 541 | |
| 542 | /* find 1st bit in difference between the 2 addrs. |
| 543 | |
YOSHIFUJI Hideaki | 971f359 | 2005-11-08 09:37:56 -0800 | [diff] [blame] | 544 | See comment in __ipv6_addr_diff: bit may be an invalid value, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 545 | but if it is >= plen, the value is ignored in any case. |
| 546 | */ |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 547 | |
YOSHIFUJI Hideaki | 971f359 | 2005-11-08 09:37:56 -0800 | [diff] [blame] | 548 | bit = __ipv6_addr_diff(addr, &key->addr, addrlen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 549 | |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 550 | /* |
| 551 | * (intermediate)[in] |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 552 | * / \ |
| 553 | * (new leaf node)[ln] (old node)[fn] |
| 554 | */ |
| 555 | if (plen > bit) { |
| 556 | in = node_alloc(); |
| 557 | ln = node_alloc(); |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 558 | |
David S. Miller | 507c9b1 | 2011-12-03 17:50:45 -0500 | [diff] [blame] | 559 | if (!in || !ln) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 560 | if (in) |
| 561 | node_free(in); |
| 562 | if (ln) |
| 563 | node_free(ln); |
| 564 | return NULL; |
| 565 | } |
| 566 | |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 567 | /* |
| 568 | * new intermediate node. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 569 | * RTN_RTINFO will |
| 570 | * be off since that an address that chooses one of |
| 571 | * the branches would not match less specific routes |
| 572 | * in the other branch |
| 573 | */ |
| 574 | |
| 575 | in->fn_bit = bit; |
| 576 | |
| 577 | in->parent = pn; |
| 578 | in->leaf = fn->leaf; |
| 579 | atomic_inc(&in->leaf->rt6i_ref); |
| 580 | |
| 581 | in->fn_sernum = sernum; |
| 582 | |
| 583 | /* update parent pointer */ |
| 584 | if (dir) |
| 585 | pn->right = in; |
| 586 | else |
| 587 | pn->left = in; |
| 588 | |
| 589 | ln->fn_bit = plen; |
| 590 | |
| 591 | ln->parent = in; |
| 592 | fn->parent = in; |
| 593 | |
| 594 | ln->fn_sernum = sernum; |
| 595 | |
| 596 | if (addr_bit_set(addr, bit)) { |
| 597 | in->right = ln; |
| 598 | in->left = fn; |
| 599 | } else { |
| 600 | in->left = ln; |
| 601 | in->right = fn; |
| 602 | } |
| 603 | } else { /* plen <= bit */ |
| 604 | |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 605 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 606 | * (new leaf node)[ln] |
| 607 | * / \ |
| 608 | * (old node)[fn] NULL |
| 609 | */ |
| 610 | |
| 611 | ln = node_alloc(); |
| 612 | |
David S. Miller | 507c9b1 | 2011-12-03 17:50:45 -0500 | [diff] [blame] | 613 | if (!ln) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 614 | return NULL; |
| 615 | |
| 616 | ln->fn_bit = plen; |
| 617 | |
| 618 | ln->parent = pn; |
| 619 | |
| 620 | ln->fn_sernum = sernum; |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 621 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 622 | if (dir) |
| 623 | pn->right = ln; |
| 624 | else |
| 625 | pn->left = ln; |
| 626 | |
| 627 | if (addr_bit_set(&key->addr, plen)) |
| 628 | ln->right = fn; |
| 629 | else |
| 630 | ln->left = fn; |
| 631 | |
| 632 | fn->parent = ln; |
| 633 | } |
| 634 | return ln; |
| 635 | } |
| 636 | |
| 637 | /* |
| 638 | * Insert routing information in a node. |
| 639 | */ |
| 640 | |
| 641 | static int fib6_add_rt2node(struct fib6_node *fn, struct rt6_info *rt, |
Thomas Graf | 86872cb | 2006-08-22 00:01:08 -0700 | [diff] [blame] | 642 | struct nl_info *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 643 | { |
| 644 | struct rt6_info *iter = NULL; |
| 645 | struct rt6_info **ins; |
David S. Miller | 507c9b1 | 2011-12-03 17:50:45 -0500 | [diff] [blame] | 646 | int replace = (info->nlh && |
| 647 | (info->nlh->nlmsg_flags & NLM_F_REPLACE)); |
| 648 | int add = (!info->nlh || |
| 649 | (info->nlh->nlmsg_flags & NLM_F_CREATE)); |
Matti Vaittinen | 4a287eb | 2011-11-14 00:15:14 +0000 | [diff] [blame] | 650 | int found = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 651 | |
| 652 | ins = &fn->leaf; |
| 653 | |
David S. Miller | 507c9b1 | 2011-12-03 17:50:45 -0500 | [diff] [blame] | 654 | for (iter = fn->leaf; iter; iter = iter->dst.rt6_next) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 655 | /* |
| 656 | * Search for duplicates |
| 657 | */ |
| 658 | |
| 659 | if (iter->rt6i_metric == rt->rt6i_metric) { |
| 660 | /* |
| 661 | * Same priority level |
| 662 | */ |
David S. Miller | 507c9b1 | 2011-12-03 17:50:45 -0500 | [diff] [blame] | 663 | if (info->nlh && |
| 664 | (info->nlh->nlmsg_flags & NLM_F_EXCL)) |
Matti Vaittinen | 4a287eb | 2011-11-14 00:15:14 +0000 | [diff] [blame] | 665 | return -EEXIST; |
| 666 | if (replace) { |
| 667 | found++; |
| 668 | break; |
| 669 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 670 | |
David S. Miller | d191854 | 2011-12-28 20:19:20 -0500 | [diff] [blame] | 671 | if (iter->dst.dev == rt->dst.dev && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 672 | iter->rt6i_idev == rt->rt6i_idev && |
| 673 | ipv6_addr_equal(&iter->rt6i_gateway, |
| 674 | &rt->rt6i_gateway)) { |
David S. Miller | 507c9b1 | 2011-12-03 17:50:45 -0500 | [diff] [blame] | 675 | if (!(iter->rt6i_flags & RTF_EXPIRES)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 676 | return -EEXIST; |
Gao feng | 1716a96 | 2012-04-06 00:13:10 +0000 | [diff] [blame] | 677 | if (!(rt->rt6i_flags & RTF_EXPIRES)) |
| 678 | rt6_clean_expires(iter); |
| 679 | else |
| 680 | rt6_set_expires(iter, rt->dst.expires); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 681 | return -EEXIST; |
| 682 | } |
| 683 | } |
| 684 | |
| 685 | if (iter->rt6i_metric > rt->rt6i_metric) |
| 686 | break; |
| 687 | |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 688 | ins = &iter->dst.rt6_next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 689 | } |
| 690 | |
David S. Miller | f11e665 | 2007-03-24 20:36:25 -0700 | [diff] [blame] | 691 | /* Reset round-robin state, if necessary */ |
| 692 | if (ins == &fn->leaf) |
| 693 | fn->rr_ptr = NULL; |
| 694 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 695 | /* |
| 696 | * insert node |
| 697 | */ |
Matti Vaittinen | 4a287eb | 2011-11-14 00:15:14 +0000 | [diff] [blame] | 698 | if (!replace) { |
| 699 | if (!add) |
Joe Perches | f321383 | 2012-05-15 14:11:53 +0000 | [diff] [blame] | 700 | pr_warn("NLM_F_CREATE should be set when creating new route\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 701 | |
Matti Vaittinen | 4a287eb | 2011-11-14 00:15:14 +0000 | [diff] [blame] | 702 | add: |
| 703 | rt->dst.rt6_next = iter; |
| 704 | *ins = rt; |
| 705 | rt->rt6i_node = fn; |
| 706 | atomic_inc(&rt->rt6i_ref); |
| 707 | inet6_rt_notify(RTM_NEWROUTE, rt, info); |
| 708 | info->nl_net->ipv6.rt6_stats->fib_rt_entries++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 709 | |
David S. Miller | 507c9b1 | 2011-12-03 17:50:45 -0500 | [diff] [blame] | 710 | if (!(fn->fn_flags & RTN_RTINFO)) { |
Matti Vaittinen | 4a287eb | 2011-11-14 00:15:14 +0000 | [diff] [blame] | 711 | info->nl_net->ipv6.rt6_stats->fib_route_nodes++; |
| 712 | fn->fn_flags |= RTN_RTINFO; |
| 713 | } |
| 714 | |
| 715 | } else { |
| 716 | if (!found) { |
| 717 | if (add) |
| 718 | goto add; |
Joe Perches | f321383 | 2012-05-15 14:11:53 +0000 | [diff] [blame] | 719 | pr_warn("NLM_F_REPLACE set, but no existing node found!\n"); |
Matti Vaittinen | 4a287eb | 2011-11-14 00:15:14 +0000 | [diff] [blame] | 720 | return -ENOENT; |
| 721 | } |
| 722 | *ins = rt; |
| 723 | rt->rt6i_node = fn; |
| 724 | rt->dst.rt6_next = iter->dst.rt6_next; |
| 725 | atomic_inc(&rt->rt6i_ref); |
| 726 | inet6_rt_notify(RTM_NEWROUTE, rt, info); |
| 727 | rt6_release(iter); |
David S. Miller | 507c9b1 | 2011-12-03 17:50:45 -0500 | [diff] [blame] | 728 | if (!(fn->fn_flags & RTN_RTINFO)) { |
Matti Vaittinen | 4a287eb | 2011-11-14 00:15:14 +0000 | [diff] [blame] | 729 | info->nl_net->ipv6.rt6_stats->fib_route_nodes++; |
| 730 | fn->fn_flags |= RTN_RTINFO; |
| 731 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 732 | } |
| 733 | |
| 734 | return 0; |
| 735 | } |
| 736 | |
Daniel Lezcano | 63152fc | 2008-03-03 23:31:11 -0800 | [diff] [blame] | 737 | static __inline__ void fib6_start_gc(struct net *net, struct rt6_info *rt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 738 | { |
Stephen Hemminger | 417f28b | 2008-07-22 14:33:45 -0700 | [diff] [blame] | 739 | if (!timer_pending(&net->ipv6.ip6_fib_timer) && |
David S. Miller | 507c9b1 | 2011-12-03 17:50:45 -0500 | [diff] [blame] | 740 | (rt->rt6i_flags & (RTF_EXPIRES | RTF_CACHE))) |
Stephen Hemminger | 417f28b | 2008-07-22 14:33:45 -0700 | [diff] [blame] | 741 | mod_timer(&net->ipv6.ip6_fib_timer, |
Stephen Hemminger | 847499c | 2008-07-21 13:21:35 -0700 | [diff] [blame] | 742 | jiffies + net->ipv6.sysctl.ip6_rt_gc_interval); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 743 | } |
| 744 | |
Daniel Lezcano | 63152fc | 2008-03-03 23:31:11 -0800 | [diff] [blame] | 745 | void fib6_force_start_gc(struct net *net) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 746 | { |
Stephen Hemminger | 417f28b | 2008-07-22 14:33:45 -0700 | [diff] [blame] | 747 | if (!timer_pending(&net->ipv6.ip6_fib_timer)) |
| 748 | mod_timer(&net->ipv6.ip6_fib_timer, |
Stephen Hemminger | 847499c | 2008-07-21 13:21:35 -0700 | [diff] [blame] | 749 | jiffies + net->ipv6.sysctl.ip6_rt_gc_interval); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 750 | } |
| 751 | |
| 752 | /* |
| 753 | * Add routing information to the routing tree. |
| 754 | * <destination addr>/<source addr> |
| 755 | * with source addr info in sub-trees |
| 756 | */ |
| 757 | |
Thomas Graf | 86872cb | 2006-08-22 00:01:08 -0700 | [diff] [blame] | 758 | int fib6_add(struct fib6_node *root, struct rt6_info *rt, struct nl_info *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 759 | { |
YOSHIFUJI Hideaki | 66729e1 | 2006-08-23 17:20:34 -0700 | [diff] [blame] | 760 | struct fib6_node *fn, *pn = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 761 | int err = -ENOMEM; |
Matti Vaittinen | 4a287eb | 2011-11-14 00:15:14 +0000 | [diff] [blame] | 762 | int allow_create = 1; |
| 763 | int replace_required = 0; |
David S. Miller | 507c9b1 | 2011-12-03 17:50:45 -0500 | [diff] [blame] | 764 | |
| 765 | if (info->nlh) { |
| 766 | if (!(info->nlh->nlmsg_flags & NLM_F_CREATE)) |
Matti Vaittinen | 4a287eb | 2011-11-14 00:15:14 +0000 | [diff] [blame] | 767 | allow_create = 0; |
David S. Miller | 507c9b1 | 2011-12-03 17:50:45 -0500 | [diff] [blame] | 768 | if (info->nlh->nlmsg_flags & NLM_F_REPLACE) |
Matti Vaittinen | 4a287eb | 2011-11-14 00:15:14 +0000 | [diff] [blame] | 769 | replace_required = 1; |
| 770 | } |
| 771 | if (!allow_create && !replace_required) |
Joe Perches | f321383 | 2012-05-15 14:11:53 +0000 | [diff] [blame] | 772 | pr_warn("RTM_NEWROUTE with no NLM_F_CREATE or NLM_F_REPLACE\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 773 | |
| 774 | fn = fib6_add_1(root, &rt->rt6i_dst.addr, sizeof(struct in6_addr), |
David S. Miller | 507c9b1 | 2011-12-03 17:50:45 -0500 | [diff] [blame] | 775 | rt->rt6i_dst.plen, offsetof(struct rt6_info, rt6i_dst), |
| 776 | allow_create, replace_required); |
Matti Vaittinen | 4a287eb | 2011-11-14 00:15:14 +0000 | [diff] [blame] | 777 | |
| 778 | if (IS_ERR(fn)) { |
| 779 | err = PTR_ERR(fn); |
| 780 | fn = NULL; |
| 781 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 782 | |
David S. Miller | 507c9b1 | 2011-12-03 17:50:45 -0500 | [diff] [blame] | 783 | if (!fn) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 784 | goto out; |
| 785 | |
YOSHIFUJI Hideaki | 66729e1 | 2006-08-23 17:20:34 -0700 | [diff] [blame] | 786 | pn = fn; |
| 787 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 788 | #ifdef CONFIG_IPV6_SUBTREES |
| 789 | if (rt->rt6i_src.plen) { |
| 790 | struct fib6_node *sn; |
| 791 | |
David S. Miller | 507c9b1 | 2011-12-03 17:50:45 -0500 | [diff] [blame] | 792 | if (!fn->subtree) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 793 | struct fib6_node *sfn; |
| 794 | |
| 795 | /* |
| 796 | * Create subtree. |
| 797 | * |
| 798 | * fn[main tree] |
| 799 | * | |
| 800 | * sfn[subtree root] |
| 801 | * \ |
| 802 | * sn[new leaf node] |
| 803 | */ |
| 804 | |
| 805 | /* Create subtree root node */ |
| 806 | sfn = node_alloc(); |
David S. Miller | 507c9b1 | 2011-12-03 17:50:45 -0500 | [diff] [blame] | 807 | if (!sfn) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 808 | goto st_failure; |
| 809 | |
Daniel Lezcano | 8ed6778 | 2008-03-04 13:48:30 -0800 | [diff] [blame] | 810 | sfn->leaf = info->nl_net->ipv6.ip6_null_entry; |
| 811 | atomic_inc(&info->nl_net->ipv6.ip6_null_entry->rt6i_ref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 812 | sfn->fn_flags = RTN_ROOT; |
| 813 | sfn->fn_sernum = fib6_new_sernum(); |
| 814 | |
| 815 | /* Now add the first leaf node to new subtree */ |
| 816 | |
| 817 | sn = fib6_add_1(sfn, &rt->rt6i_src.addr, |
| 818 | sizeof(struct in6_addr), rt->rt6i_src.plen, |
Matti Vaittinen | 4a287eb | 2011-11-14 00:15:14 +0000 | [diff] [blame] | 819 | offsetof(struct rt6_info, rt6i_src), |
| 820 | allow_create, replace_required); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 821 | |
David S. Miller | 507c9b1 | 2011-12-03 17:50:45 -0500 | [diff] [blame] | 822 | if (!sn) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 823 | /* If it is failed, discard just allocated |
| 824 | root, and then (in st_failure) stale node |
| 825 | in main tree. |
| 826 | */ |
| 827 | node_free(sfn); |
| 828 | goto st_failure; |
| 829 | } |
| 830 | |
| 831 | /* Now link new subtree to main tree */ |
| 832 | sfn->parent = fn; |
| 833 | fn->subtree = sfn; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 834 | } else { |
| 835 | sn = fib6_add_1(fn->subtree, &rt->rt6i_src.addr, |
| 836 | sizeof(struct in6_addr), rt->rt6i_src.plen, |
Matti Vaittinen | 4a287eb | 2011-11-14 00:15:14 +0000 | [diff] [blame] | 837 | offsetof(struct rt6_info, rt6i_src), |
| 838 | allow_create, replace_required); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 839 | |
Matti Vaittinen | 4a287eb | 2011-11-14 00:15:14 +0000 | [diff] [blame] | 840 | if (IS_ERR(sn)) { |
| 841 | err = PTR_ERR(sn); |
| 842 | sn = NULL; |
| 843 | } |
David S. Miller | 507c9b1 | 2011-12-03 17:50:45 -0500 | [diff] [blame] | 844 | if (!sn) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 845 | goto st_failure; |
| 846 | } |
| 847 | |
David S. Miller | 507c9b1 | 2011-12-03 17:50:45 -0500 | [diff] [blame] | 848 | if (!fn->leaf) { |
YOSHIFUJI Hideaki | 66729e1 | 2006-08-23 17:20:34 -0700 | [diff] [blame] | 849 | fn->leaf = rt; |
| 850 | atomic_inc(&rt->rt6i_ref); |
| 851 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 852 | fn = sn; |
| 853 | } |
| 854 | #endif |
| 855 | |
Thomas Graf | 86872cb | 2006-08-22 00:01:08 -0700 | [diff] [blame] | 856 | err = fib6_add_rt2node(fn, rt, info); |
David S. Miller | 507c9b1 | 2011-12-03 17:50:45 -0500 | [diff] [blame] | 857 | if (!err) { |
Daniel Lezcano | 63152fc | 2008-03-03 23:31:11 -0800 | [diff] [blame] | 858 | fib6_start_gc(info->nl_net, rt); |
David S. Miller | 507c9b1 | 2011-12-03 17:50:45 -0500 | [diff] [blame] | 859 | if (!(rt->rt6i_flags & RTF_CACHE)) |
Benjamin Thery | ec7d43c | 2008-03-03 23:31:57 -0800 | [diff] [blame] | 860 | fib6_prune_clones(info->nl_net, pn, rt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 861 | } |
| 862 | |
| 863 | out: |
YOSHIFUJI Hideaki | 66729e1 | 2006-08-23 17:20:34 -0700 | [diff] [blame] | 864 | if (err) { |
| 865 | #ifdef CONFIG_IPV6_SUBTREES |
| 866 | /* |
| 867 | * If fib6_add_1 has cleared the old leaf pointer in the |
| 868 | * super-tree leaf node we have to find a new one for it. |
| 869 | */ |
David S. Miller | 3c05123 | 2008-04-18 01:46:19 -0700 | [diff] [blame] | 870 | if (pn != fn && pn->leaf == rt) { |
| 871 | pn->leaf = NULL; |
| 872 | atomic_dec(&rt->rt6i_ref); |
| 873 | } |
YOSHIFUJI Hideaki | 66729e1 | 2006-08-23 17:20:34 -0700 | [diff] [blame] | 874 | if (pn != fn && !pn->leaf && !(pn->fn_flags & RTN_RTINFO)) { |
Daniel Lezcano | 8ed6778 | 2008-03-04 13:48:30 -0800 | [diff] [blame] | 875 | pn->leaf = fib6_find_prefix(info->nl_net, pn); |
YOSHIFUJI Hideaki | 66729e1 | 2006-08-23 17:20:34 -0700 | [diff] [blame] | 876 | #if RT6_DEBUG >= 2 |
| 877 | if (!pn->leaf) { |
Ilpo Järvinen | 547b792 | 2008-07-25 21:43:18 -0700 | [diff] [blame] | 878 | WARN_ON(pn->leaf == NULL); |
Daniel Lezcano | 8ed6778 | 2008-03-04 13:48:30 -0800 | [diff] [blame] | 879 | pn->leaf = info->nl_net->ipv6.ip6_null_entry; |
YOSHIFUJI Hideaki | 66729e1 | 2006-08-23 17:20:34 -0700 | [diff] [blame] | 880 | } |
| 881 | #endif |
| 882 | atomic_inc(&pn->leaf->rt6i_ref); |
| 883 | } |
| 884 | #endif |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 885 | dst_free(&rt->dst); |
YOSHIFUJI Hideaki | 66729e1 | 2006-08-23 17:20:34 -0700 | [diff] [blame] | 886 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 887 | return err; |
| 888 | |
| 889 | #ifdef CONFIG_IPV6_SUBTREES |
| 890 | /* Subtree creation failed, probably main tree node |
| 891 | is orphan. If it is, shoot it. |
| 892 | */ |
| 893 | st_failure: |
| 894 | if (fn && !(fn->fn_flags & (RTN_RTINFO|RTN_ROOT))) |
Daniel Lezcano | 8ed6778 | 2008-03-04 13:48:30 -0800 | [diff] [blame] | 895 | fib6_repair_tree(info->nl_net, fn); |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 896 | dst_free(&rt->dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 897 | return err; |
| 898 | #endif |
| 899 | } |
| 900 | |
| 901 | /* |
| 902 | * Routing tree lookup |
| 903 | * |
| 904 | */ |
| 905 | |
| 906 | struct lookup_args { |
David S. Miller | 507c9b1 | 2011-12-03 17:50:45 -0500 | [diff] [blame] | 907 | int offset; /* key offset on rt6_info */ |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 908 | const struct in6_addr *addr; /* search key */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 909 | }; |
| 910 | |
| 911 | static struct fib6_node * fib6_lookup_1(struct fib6_node *root, |
| 912 | struct lookup_args *args) |
| 913 | { |
| 914 | struct fib6_node *fn; |
Al Viro | e69a4ad | 2006-11-14 20:56:00 -0800 | [diff] [blame] | 915 | __be32 dir; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 916 | |
YOSHIFUJI Hideaki | 825e288 | 2006-08-23 17:21:29 -0700 | [diff] [blame] | 917 | if (unlikely(args->offset == 0)) |
| 918 | return NULL; |
| 919 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 920 | /* |
| 921 | * Descend on a tree |
| 922 | */ |
| 923 | |
| 924 | fn = root; |
| 925 | |
| 926 | for (;;) { |
| 927 | struct fib6_node *next; |
| 928 | |
| 929 | dir = addr_bit_set(args->addr, fn->fn_bit); |
| 930 | |
| 931 | next = dir ? fn->right : fn->left; |
| 932 | |
| 933 | if (next) { |
| 934 | fn = next; |
| 935 | continue; |
| 936 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 937 | break; |
| 938 | } |
| 939 | |
David S. Miller | 507c9b1 | 2011-12-03 17:50:45 -0500 | [diff] [blame] | 940 | while (fn) { |
YOSHIFUJI Hideaki | 7fc3316 | 2006-08-23 17:22:24 -0700 | [diff] [blame] | 941 | if (FIB6_SUBTREE(fn) || fn->fn_flags & RTN_RTINFO) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 942 | struct rt6key *key; |
| 943 | |
| 944 | key = (struct rt6key *) ((u8 *) fn->leaf + |
| 945 | args->offset); |
| 946 | |
YOSHIFUJI Hideaki | 3fc5e04 | 2006-08-23 17:21:12 -0700 | [diff] [blame] | 947 | if (ipv6_prefix_equal(&key->addr, args->addr, key->plen)) { |
| 948 | #ifdef CONFIG_IPV6_SUBTREES |
| 949 | if (fn->subtree) |
| 950 | fn = fib6_lookup_1(fn->subtree, args + 1); |
| 951 | #endif |
| 952 | if (!fn || fn->fn_flags & RTN_RTINFO) |
| 953 | return fn; |
| 954 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 955 | } |
| 956 | |
YOSHIFUJI Hideaki | 3fc5e04 | 2006-08-23 17:21:12 -0700 | [diff] [blame] | 957 | if (fn->fn_flags & RTN_ROOT) |
| 958 | break; |
| 959 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 960 | fn = fn->parent; |
| 961 | } |
| 962 | |
| 963 | return NULL; |
| 964 | } |
| 965 | |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 966 | struct fib6_node * fib6_lookup(struct fib6_node *root, const struct in6_addr *daddr, |
| 967 | const struct in6_addr *saddr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 968 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 969 | struct fib6_node *fn; |
YOSHIFUJI Hideaki | 825e288 | 2006-08-23 17:21:29 -0700 | [diff] [blame] | 970 | struct lookup_args args[] = { |
| 971 | { |
| 972 | .offset = offsetof(struct rt6_info, rt6i_dst), |
| 973 | .addr = daddr, |
| 974 | }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 975 | #ifdef CONFIG_IPV6_SUBTREES |
YOSHIFUJI Hideaki | 825e288 | 2006-08-23 17:21:29 -0700 | [diff] [blame] | 976 | { |
| 977 | .offset = offsetof(struct rt6_info, rt6i_src), |
| 978 | .addr = saddr, |
| 979 | }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 980 | #endif |
YOSHIFUJI Hideaki | 825e288 | 2006-08-23 17:21:29 -0700 | [diff] [blame] | 981 | { |
| 982 | .offset = 0, /* sentinel */ |
| 983 | } |
| 984 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 985 | |
YOSHIFUJI Hideaki | fefc2a6 | 2006-08-23 17:21:50 -0700 | [diff] [blame] | 986 | fn = fib6_lookup_1(root, daddr ? args : args + 1); |
David S. Miller | 507c9b1 | 2011-12-03 17:50:45 -0500 | [diff] [blame] | 987 | if (!fn || fn->fn_flags & RTN_TL_ROOT) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 988 | fn = root; |
| 989 | |
| 990 | return fn; |
| 991 | } |
| 992 | |
| 993 | /* |
| 994 | * Get node with specified destination prefix (and source prefix, |
| 995 | * if subtrees are used) |
| 996 | */ |
| 997 | |
| 998 | |
| 999 | static struct fib6_node * fib6_locate_1(struct fib6_node *root, |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 1000 | const struct in6_addr *addr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1001 | int plen, int offset) |
| 1002 | { |
| 1003 | struct fib6_node *fn; |
| 1004 | |
| 1005 | for (fn = root; fn ; ) { |
| 1006 | struct rt6key *key = (struct rt6key *)((u8 *)fn->leaf + offset); |
| 1007 | |
| 1008 | /* |
| 1009 | * Prefix match |
| 1010 | */ |
| 1011 | if (plen < fn->fn_bit || |
| 1012 | !ipv6_prefix_equal(&key->addr, addr, fn->fn_bit)) |
| 1013 | return NULL; |
| 1014 | |
| 1015 | if (plen == fn->fn_bit) |
| 1016 | return fn; |
| 1017 | |
| 1018 | /* |
| 1019 | * We have more bits to go |
| 1020 | */ |
| 1021 | if (addr_bit_set(addr, fn->fn_bit)) |
| 1022 | fn = fn->right; |
| 1023 | else |
| 1024 | fn = fn->left; |
| 1025 | } |
| 1026 | return NULL; |
| 1027 | } |
| 1028 | |
| 1029 | struct fib6_node * fib6_locate(struct fib6_node *root, |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 1030 | const struct in6_addr *daddr, int dst_len, |
| 1031 | const struct in6_addr *saddr, int src_len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1032 | { |
| 1033 | struct fib6_node *fn; |
| 1034 | |
| 1035 | fn = fib6_locate_1(root, daddr, dst_len, |
| 1036 | offsetof(struct rt6_info, rt6i_dst)); |
| 1037 | |
| 1038 | #ifdef CONFIG_IPV6_SUBTREES |
| 1039 | if (src_len) { |
Ilpo Järvinen | 547b792 | 2008-07-25 21:43:18 -0700 | [diff] [blame] | 1040 | WARN_ON(saddr == NULL); |
YOSHIFUJI Hideaki | 3fc5e04 | 2006-08-23 17:21:12 -0700 | [diff] [blame] | 1041 | if (fn && fn->subtree) |
| 1042 | fn = fib6_locate_1(fn->subtree, saddr, src_len, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1043 | offsetof(struct rt6_info, rt6i_src)); |
| 1044 | } |
| 1045 | #endif |
| 1046 | |
David S. Miller | 507c9b1 | 2011-12-03 17:50:45 -0500 | [diff] [blame] | 1047 | if (fn && fn->fn_flags & RTN_RTINFO) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1048 | return fn; |
| 1049 | |
| 1050 | return NULL; |
| 1051 | } |
| 1052 | |
| 1053 | |
| 1054 | /* |
| 1055 | * Deletion |
| 1056 | * |
| 1057 | */ |
| 1058 | |
Daniel Lezcano | 8ed6778 | 2008-03-04 13:48:30 -0800 | [diff] [blame] | 1059 | static struct rt6_info *fib6_find_prefix(struct net *net, struct fib6_node *fn) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1060 | { |
David S. Miller | 507c9b1 | 2011-12-03 17:50:45 -0500 | [diff] [blame] | 1061 | if (fn->fn_flags & RTN_ROOT) |
Daniel Lezcano | 8ed6778 | 2008-03-04 13:48:30 -0800 | [diff] [blame] | 1062 | return net->ipv6.ip6_null_entry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1063 | |
David S. Miller | 507c9b1 | 2011-12-03 17:50:45 -0500 | [diff] [blame] | 1064 | while (fn) { |
| 1065 | if (fn->left) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1066 | return fn->left->leaf; |
David S. Miller | 507c9b1 | 2011-12-03 17:50:45 -0500 | [diff] [blame] | 1067 | if (fn->right) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1068 | return fn->right->leaf; |
| 1069 | |
YOSHIFUJI Hideaki | 7fc3316 | 2006-08-23 17:22:24 -0700 | [diff] [blame] | 1070 | fn = FIB6_SUBTREE(fn); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1071 | } |
| 1072 | return NULL; |
| 1073 | } |
| 1074 | |
| 1075 | /* |
| 1076 | * Called to trim the tree of intermediate nodes when possible. "fn" |
| 1077 | * is the node we want to try and remove. |
| 1078 | */ |
| 1079 | |
Daniel Lezcano | 8ed6778 | 2008-03-04 13:48:30 -0800 | [diff] [blame] | 1080 | static struct fib6_node *fib6_repair_tree(struct net *net, |
| 1081 | struct fib6_node *fn) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1082 | { |
| 1083 | int children; |
| 1084 | int nstate; |
| 1085 | struct fib6_node *child, *pn; |
| 1086 | struct fib6_walker_t *w; |
| 1087 | int iter = 0; |
| 1088 | |
| 1089 | for (;;) { |
| 1090 | RT6_TRACE("fixing tree: plen=%d iter=%d\n", fn->fn_bit, iter); |
| 1091 | iter++; |
| 1092 | |
Ilpo Järvinen | 547b792 | 2008-07-25 21:43:18 -0700 | [diff] [blame] | 1093 | WARN_ON(fn->fn_flags & RTN_RTINFO); |
| 1094 | WARN_ON(fn->fn_flags & RTN_TL_ROOT); |
| 1095 | WARN_ON(fn->leaf != NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1096 | |
| 1097 | children = 0; |
| 1098 | child = NULL; |
| 1099 | if (fn->right) child = fn->right, children |= 1; |
| 1100 | if (fn->left) child = fn->left, children |= 2; |
| 1101 | |
YOSHIFUJI Hideaki | 7fc3316 | 2006-08-23 17:22:24 -0700 | [diff] [blame] | 1102 | if (children == 3 || FIB6_SUBTREE(fn) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1103 | #ifdef CONFIG_IPV6_SUBTREES |
| 1104 | /* Subtree root (i.e. fn) may have one child */ |
David S. Miller | 507c9b1 | 2011-12-03 17:50:45 -0500 | [diff] [blame] | 1105 | || (children && fn->fn_flags & RTN_ROOT) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1106 | #endif |
| 1107 | ) { |
Daniel Lezcano | 8ed6778 | 2008-03-04 13:48:30 -0800 | [diff] [blame] | 1108 | fn->leaf = fib6_find_prefix(net, fn); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1109 | #if RT6_DEBUG >= 2 |
David S. Miller | 507c9b1 | 2011-12-03 17:50:45 -0500 | [diff] [blame] | 1110 | if (!fn->leaf) { |
Ilpo Järvinen | 547b792 | 2008-07-25 21:43:18 -0700 | [diff] [blame] | 1111 | WARN_ON(!fn->leaf); |
Daniel Lezcano | 8ed6778 | 2008-03-04 13:48:30 -0800 | [diff] [blame] | 1112 | fn->leaf = net->ipv6.ip6_null_entry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1113 | } |
| 1114 | #endif |
| 1115 | atomic_inc(&fn->leaf->rt6i_ref); |
| 1116 | return fn->parent; |
| 1117 | } |
| 1118 | |
| 1119 | pn = fn->parent; |
| 1120 | #ifdef CONFIG_IPV6_SUBTREES |
YOSHIFUJI Hideaki | 7fc3316 | 2006-08-23 17:22:24 -0700 | [diff] [blame] | 1121 | if (FIB6_SUBTREE(pn) == fn) { |
Ilpo Järvinen | 547b792 | 2008-07-25 21:43:18 -0700 | [diff] [blame] | 1122 | WARN_ON(!(fn->fn_flags & RTN_ROOT)); |
YOSHIFUJI Hideaki | 7fc3316 | 2006-08-23 17:22:24 -0700 | [diff] [blame] | 1123 | FIB6_SUBTREE(pn) = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1124 | nstate = FWS_L; |
| 1125 | } else { |
Ilpo Järvinen | 547b792 | 2008-07-25 21:43:18 -0700 | [diff] [blame] | 1126 | WARN_ON(fn->fn_flags & RTN_ROOT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1127 | #endif |
| 1128 | if (pn->right == fn) pn->right = child; |
| 1129 | else if (pn->left == fn) pn->left = child; |
| 1130 | #if RT6_DEBUG >= 2 |
Ilpo Järvinen | 547b792 | 2008-07-25 21:43:18 -0700 | [diff] [blame] | 1131 | else |
| 1132 | WARN_ON(1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1133 | #endif |
| 1134 | if (child) |
| 1135 | child->parent = pn; |
| 1136 | nstate = FWS_R; |
| 1137 | #ifdef CONFIG_IPV6_SUBTREES |
| 1138 | } |
| 1139 | #endif |
| 1140 | |
| 1141 | read_lock(&fib6_walker_lock); |
| 1142 | FOR_WALKERS(w) { |
David S. Miller | 507c9b1 | 2011-12-03 17:50:45 -0500 | [diff] [blame] | 1143 | if (!child) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1144 | if (w->root == fn) { |
| 1145 | w->root = w->node = NULL; |
| 1146 | RT6_TRACE("W %p adjusted by delroot 1\n", w); |
| 1147 | } else if (w->node == fn) { |
| 1148 | RT6_TRACE("W %p adjusted by delnode 1, s=%d/%d\n", w, w->state, nstate); |
| 1149 | w->node = pn; |
| 1150 | w->state = nstate; |
| 1151 | } |
| 1152 | } else { |
| 1153 | if (w->root == fn) { |
| 1154 | w->root = child; |
| 1155 | RT6_TRACE("W %p adjusted by delroot 2\n", w); |
| 1156 | } |
| 1157 | if (w->node == fn) { |
| 1158 | w->node = child; |
| 1159 | if (children&2) { |
| 1160 | RT6_TRACE("W %p adjusted by delnode 2, s=%d\n", w, w->state); |
| 1161 | w->state = w->state>=FWS_R ? FWS_U : FWS_INIT; |
| 1162 | } else { |
| 1163 | RT6_TRACE("W %p adjusted by delnode 2, s=%d\n", w, w->state); |
| 1164 | w->state = w->state>=FWS_C ? FWS_U : FWS_INIT; |
| 1165 | } |
| 1166 | } |
| 1167 | } |
| 1168 | } |
| 1169 | read_unlock(&fib6_walker_lock); |
| 1170 | |
| 1171 | node_free(fn); |
David S. Miller | 507c9b1 | 2011-12-03 17:50:45 -0500 | [diff] [blame] | 1172 | if (pn->fn_flags & RTN_RTINFO || FIB6_SUBTREE(pn)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1173 | return pn; |
| 1174 | |
| 1175 | rt6_release(pn->leaf); |
| 1176 | pn->leaf = NULL; |
| 1177 | fn = pn; |
| 1178 | } |
| 1179 | } |
| 1180 | |
| 1181 | static void fib6_del_route(struct fib6_node *fn, struct rt6_info **rtp, |
Thomas Graf | 86872cb | 2006-08-22 00:01:08 -0700 | [diff] [blame] | 1182 | struct nl_info *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1183 | { |
| 1184 | struct fib6_walker_t *w; |
| 1185 | struct rt6_info *rt = *rtp; |
Benjamin Thery | c572872 | 2008-03-03 23:34:17 -0800 | [diff] [blame] | 1186 | struct net *net = info->nl_net; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1187 | |
| 1188 | RT6_TRACE("fib6_del_route\n"); |
| 1189 | |
| 1190 | /* Unlink it */ |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1191 | *rtp = rt->dst.rt6_next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1192 | rt->rt6i_node = NULL; |
Benjamin Thery | c572872 | 2008-03-03 23:34:17 -0800 | [diff] [blame] | 1193 | net->ipv6.rt6_stats->fib_rt_entries--; |
| 1194 | net->ipv6.rt6_stats->fib_discarded_routes++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1195 | |
David S. Miller | f11e665 | 2007-03-24 20:36:25 -0700 | [diff] [blame] | 1196 | /* Reset round-robin state, if necessary */ |
| 1197 | if (fn->rr_ptr == rt) |
| 1198 | fn->rr_ptr = NULL; |
| 1199 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1200 | /* Adjust walkers */ |
| 1201 | read_lock(&fib6_walker_lock); |
| 1202 | FOR_WALKERS(w) { |
| 1203 | if (w->state == FWS_C && w->leaf == rt) { |
| 1204 | RT6_TRACE("walker %p adjusted by delroute\n", w); |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1205 | w->leaf = rt->dst.rt6_next; |
David S. Miller | 507c9b1 | 2011-12-03 17:50:45 -0500 | [diff] [blame] | 1206 | if (!w->leaf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1207 | w->state = FWS_U; |
| 1208 | } |
| 1209 | } |
| 1210 | read_unlock(&fib6_walker_lock); |
| 1211 | |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1212 | rt->dst.rt6_next = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1213 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1214 | /* If it was last route, expunge its radix tree node */ |
David S. Miller | 507c9b1 | 2011-12-03 17:50:45 -0500 | [diff] [blame] | 1215 | if (!fn->leaf) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1216 | fn->fn_flags &= ~RTN_RTINFO; |
Benjamin Thery | c572872 | 2008-03-03 23:34:17 -0800 | [diff] [blame] | 1217 | net->ipv6.rt6_stats->fib_route_nodes--; |
Daniel Lezcano | 8ed6778 | 2008-03-04 13:48:30 -0800 | [diff] [blame] | 1218 | fn = fib6_repair_tree(net, fn); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1219 | } |
| 1220 | |
| 1221 | if (atomic_read(&rt->rt6i_ref) != 1) { |
| 1222 | /* This route is used as dummy address holder in some split |
| 1223 | * nodes. It is not leaked, but it still holds other resources, |
| 1224 | * which must be released in time. So, scan ascendant nodes |
| 1225 | * and replace dummy references to this route with references |
| 1226 | * to still alive ones. |
| 1227 | */ |
| 1228 | while (fn) { |
David S. Miller | 507c9b1 | 2011-12-03 17:50:45 -0500 | [diff] [blame] | 1229 | if (!(fn->fn_flags & RTN_RTINFO) && fn->leaf == rt) { |
Daniel Lezcano | 8ed6778 | 2008-03-04 13:48:30 -0800 | [diff] [blame] | 1230 | fn->leaf = fib6_find_prefix(net, fn); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1231 | atomic_inc(&fn->leaf->rt6i_ref); |
| 1232 | rt6_release(rt); |
| 1233 | } |
| 1234 | fn = fn->parent; |
| 1235 | } |
| 1236 | /* No more references are possible at this point. */ |
Pavel Emelyanov | 2df96af | 2008-02-18 20:50:42 -0800 | [diff] [blame] | 1237 | BUG_ON(atomic_read(&rt->rt6i_ref) != 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1238 | } |
| 1239 | |
Thomas Graf | 86872cb | 2006-08-22 00:01:08 -0700 | [diff] [blame] | 1240 | inet6_rt_notify(RTM_DELROUTE, rt, info); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1241 | rt6_release(rt); |
| 1242 | } |
| 1243 | |
Thomas Graf | 86872cb | 2006-08-22 00:01:08 -0700 | [diff] [blame] | 1244 | int fib6_del(struct rt6_info *rt, struct nl_info *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1245 | { |
Daniel Lezcano | 8ed6778 | 2008-03-04 13:48:30 -0800 | [diff] [blame] | 1246 | struct net *net = info->nl_net; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1247 | struct fib6_node *fn = rt->rt6i_node; |
| 1248 | struct rt6_info **rtp; |
| 1249 | |
| 1250 | #if RT6_DEBUG >= 2 |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1251 | if (rt->dst.obsolete>0) { |
Ilpo Järvinen | 547b792 | 2008-07-25 21:43:18 -0700 | [diff] [blame] | 1252 | WARN_ON(fn != NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1253 | return -ENOENT; |
| 1254 | } |
| 1255 | #endif |
David S. Miller | 507c9b1 | 2011-12-03 17:50:45 -0500 | [diff] [blame] | 1256 | if (!fn || rt == net->ipv6.ip6_null_entry) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1257 | return -ENOENT; |
| 1258 | |
Ilpo Järvinen | 547b792 | 2008-07-25 21:43:18 -0700 | [diff] [blame] | 1259 | WARN_ON(!(fn->fn_flags & RTN_RTINFO)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1260 | |
David S. Miller | 507c9b1 | 2011-12-03 17:50:45 -0500 | [diff] [blame] | 1261 | if (!(rt->rt6i_flags & RTF_CACHE)) { |
YOSHIFUJI Hideaki | 150730d | 2006-08-23 17:22:55 -0700 | [diff] [blame] | 1262 | struct fib6_node *pn = fn; |
| 1263 | #ifdef CONFIG_IPV6_SUBTREES |
| 1264 | /* clones of this route might be in another subtree */ |
| 1265 | if (rt->rt6i_src.plen) { |
David S. Miller | 507c9b1 | 2011-12-03 17:50:45 -0500 | [diff] [blame] | 1266 | while (!(pn->fn_flags & RTN_ROOT)) |
YOSHIFUJI Hideaki | 150730d | 2006-08-23 17:22:55 -0700 | [diff] [blame] | 1267 | pn = pn->parent; |
| 1268 | pn = pn->parent; |
| 1269 | } |
| 1270 | #endif |
Benjamin Thery | ec7d43c | 2008-03-03 23:31:57 -0800 | [diff] [blame] | 1271 | fib6_prune_clones(info->nl_net, pn, rt); |
YOSHIFUJI Hideaki | 150730d | 2006-08-23 17:22:55 -0700 | [diff] [blame] | 1272 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1273 | |
| 1274 | /* |
| 1275 | * Walk the leaf entries looking for ourself |
| 1276 | */ |
| 1277 | |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1278 | for (rtp = &fn->leaf; *rtp; rtp = &(*rtp)->dst.rt6_next) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1279 | if (*rtp == rt) { |
Thomas Graf | 86872cb | 2006-08-22 00:01:08 -0700 | [diff] [blame] | 1280 | fib6_del_route(fn, rtp, info); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1281 | return 0; |
| 1282 | } |
| 1283 | } |
| 1284 | return -ENOENT; |
| 1285 | } |
| 1286 | |
| 1287 | /* |
| 1288 | * Tree traversal function. |
| 1289 | * |
| 1290 | * Certainly, it is not interrupt safe. |
| 1291 | * However, it is internally reenterable wrt itself and fib6_add/fib6_del. |
| 1292 | * It means, that we can modify tree during walking |
| 1293 | * and use this function for garbage collection, clone pruning, |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1294 | * cleaning tree when a device goes down etc. etc. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1295 | * |
| 1296 | * It guarantees that every node will be traversed, |
| 1297 | * and that it will be traversed only once. |
| 1298 | * |
| 1299 | * Callback function w->func may return: |
| 1300 | * 0 -> continue walking. |
| 1301 | * positive value -> walking is suspended (used by tree dumps, |
| 1302 | * and probably by gc, if it will be split to several slices) |
| 1303 | * negative value -> terminate walking. |
| 1304 | * |
| 1305 | * The function itself returns: |
| 1306 | * 0 -> walk is complete. |
| 1307 | * >0 -> walk is incomplete (i.e. suspended) |
| 1308 | * <0 -> walk is terminated by an error. |
| 1309 | */ |
| 1310 | |
Adrian Bunk | 90d4112 | 2006-08-14 23:49:16 -0700 | [diff] [blame] | 1311 | static int fib6_walk_continue(struct fib6_walker_t *w) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1312 | { |
| 1313 | struct fib6_node *fn, *pn; |
| 1314 | |
| 1315 | for (;;) { |
| 1316 | fn = w->node; |
David S. Miller | 507c9b1 | 2011-12-03 17:50:45 -0500 | [diff] [blame] | 1317 | if (!fn) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1318 | return 0; |
| 1319 | |
| 1320 | if (w->prune && fn != w->root && |
David S. Miller | 507c9b1 | 2011-12-03 17:50:45 -0500 | [diff] [blame] | 1321 | fn->fn_flags & RTN_RTINFO && w->state < FWS_C) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1322 | w->state = FWS_C; |
| 1323 | w->leaf = fn->leaf; |
| 1324 | } |
| 1325 | switch (w->state) { |
| 1326 | #ifdef CONFIG_IPV6_SUBTREES |
| 1327 | case FWS_S: |
YOSHIFUJI Hideaki | 7fc3316 | 2006-08-23 17:22:24 -0700 | [diff] [blame] | 1328 | if (FIB6_SUBTREE(fn)) { |
| 1329 | w->node = FIB6_SUBTREE(fn); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1330 | continue; |
| 1331 | } |
| 1332 | w->state = FWS_L; |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1333 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1334 | case FWS_L: |
| 1335 | if (fn->left) { |
| 1336 | w->node = fn->left; |
| 1337 | w->state = FWS_INIT; |
| 1338 | continue; |
| 1339 | } |
| 1340 | w->state = FWS_R; |
| 1341 | case FWS_R: |
| 1342 | if (fn->right) { |
| 1343 | w->node = fn->right; |
| 1344 | w->state = FWS_INIT; |
| 1345 | continue; |
| 1346 | } |
| 1347 | w->state = FWS_C; |
| 1348 | w->leaf = fn->leaf; |
| 1349 | case FWS_C: |
David S. Miller | 507c9b1 | 2011-12-03 17:50:45 -0500 | [diff] [blame] | 1350 | if (w->leaf && fn->fn_flags & RTN_RTINFO) { |
Patrick McHardy | 2bec5a3 | 2010-02-08 05:19:03 +0000 | [diff] [blame] | 1351 | int err; |
| 1352 | |
Eric Dumazet | fa809e2 | 2012-06-25 15:37:19 -0700 | [diff] [blame] | 1353 | if (w->skip) { |
| 1354 | w->skip--; |
Patrick McHardy | 2bec5a3 | 2010-02-08 05:19:03 +0000 | [diff] [blame] | 1355 | continue; |
| 1356 | } |
| 1357 | |
| 1358 | err = w->func(w); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1359 | if (err) |
| 1360 | return err; |
Patrick McHardy | 2bec5a3 | 2010-02-08 05:19:03 +0000 | [diff] [blame] | 1361 | |
| 1362 | w->count++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1363 | continue; |
| 1364 | } |
| 1365 | w->state = FWS_U; |
| 1366 | case FWS_U: |
| 1367 | if (fn == w->root) |
| 1368 | return 0; |
| 1369 | pn = fn->parent; |
| 1370 | w->node = pn; |
| 1371 | #ifdef CONFIG_IPV6_SUBTREES |
YOSHIFUJI Hideaki | 7fc3316 | 2006-08-23 17:22:24 -0700 | [diff] [blame] | 1372 | if (FIB6_SUBTREE(pn) == fn) { |
Ilpo Järvinen | 547b792 | 2008-07-25 21:43:18 -0700 | [diff] [blame] | 1373 | WARN_ON(!(fn->fn_flags & RTN_ROOT)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1374 | w->state = FWS_L; |
| 1375 | continue; |
| 1376 | } |
| 1377 | #endif |
| 1378 | if (pn->left == fn) { |
| 1379 | w->state = FWS_R; |
| 1380 | continue; |
| 1381 | } |
| 1382 | if (pn->right == fn) { |
| 1383 | w->state = FWS_C; |
| 1384 | w->leaf = w->node->leaf; |
| 1385 | continue; |
| 1386 | } |
| 1387 | #if RT6_DEBUG >= 2 |
Ilpo Järvinen | 547b792 | 2008-07-25 21:43:18 -0700 | [diff] [blame] | 1388 | WARN_ON(1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1389 | #endif |
| 1390 | } |
| 1391 | } |
| 1392 | } |
| 1393 | |
Adrian Bunk | 90d4112 | 2006-08-14 23:49:16 -0700 | [diff] [blame] | 1394 | static int fib6_walk(struct fib6_walker_t *w) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1395 | { |
| 1396 | int res; |
| 1397 | |
| 1398 | w->state = FWS_INIT; |
| 1399 | w->node = w->root; |
| 1400 | |
| 1401 | fib6_walker_link(w); |
| 1402 | res = fib6_walk_continue(w); |
| 1403 | if (res <= 0) |
| 1404 | fib6_walker_unlink(w); |
| 1405 | return res; |
| 1406 | } |
| 1407 | |
| 1408 | static int fib6_clean_node(struct fib6_walker_t *w) |
| 1409 | { |
| 1410 | int res; |
| 1411 | struct rt6_info *rt; |
Benjamin Thery | 0a8891a | 2007-10-08 20:39:36 -0700 | [diff] [blame] | 1412 | struct fib6_cleaner_t *c = container_of(w, struct fib6_cleaner_t, w); |
Benjamin Thery | ec7d43c | 2008-03-03 23:31:57 -0800 | [diff] [blame] | 1413 | struct nl_info info = { |
| 1414 | .nl_net = c->net, |
| 1415 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1416 | |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1417 | for (rt = w->leaf; rt; rt = rt->dst.rt6_next) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1418 | res = c->func(rt, c->arg); |
| 1419 | if (res < 0) { |
| 1420 | w->leaf = rt; |
Denis V. Lunev | 528c4ce | 2007-12-13 09:45:12 -0800 | [diff] [blame] | 1421 | res = fib6_del(rt, &info); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1422 | if (res) { |
| 1423 | #if RT6_DEBUG >= 2 |
Joe Perches | 91df42b | 2012-05-15 14:11:54 +0000 | [diff] [blame] | 1424 | pr_debug("%s: del failed: rt=%p@%p err=%d\n", |
| 1425 | __func__, rt, rt->rt6i_node, res); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1426 | #endif |
| 1427 | continue; |
| 1428 | } |
| 1429 | return 0; |
| 1430 | } |
Ilpo Järvinen | 547b792 | 2008-07-25 21:43:18 -0700 | [diff] [blame] | 1431 | WARN_ON(res != 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1432 | } |
| 1433 | w->leaf = rt; |
| 1434 | return 0; |
| 1435 | } |
| 1436 | |
| 1437 | /* |
| 1438 | * Convenient frontend to tree walker. |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1439 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1440 | * func is called on each route. |
| 1441 | * It may return -1 -> delete this route. |
| 1442 | * 0 -> continue walking |
| 1443 | * |
| 1444 | * prune==1 -> only immediate children of node (certainly, |
| 1445 | * ignoring pure split nodes) will be scanned. |
| 1446 | */ |
| 1447 | |
Benjamin Thery | ec7d43c | 2008-03-03 23:31:57 -0800 | [diff] [blame] | 1448 | static void fib6_clean_tree(struct net *net, struct fib6_node *root, |
Adrian Bunk | 8ce11e6 | 2006-08-07 21:50:48 -0700 | [diff] [blame] | 1449 | int (*func)(struct rt6_info *, void *arg), |
| 1450 | int prune, void *arg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1451 | { |
| 1452 | struct fib6_cleaner_t c; |
| 1453 | |
| 1454 | c.w.root = root; |
| 1455 | c.w.func = fib6_clean_node; |
| 1456 | c.w.prune = prune; |
Patrick McHardy | 2bec5a3 | 2010-02-08 05:19:03 +0000 | [diff] [blame] | 1457 | c.w.count = 0; |
| 1458 | c.w.skip = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1459 | c.func = func; |
| 1460 | c.arg = arg; |
Benjamin Thery | ec7d43c | 2008-03-03 23:31:57 -0800 | [diff] [blame] | 1461 | c.net = net; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1462 | |
| 1463 | fib6_walk(&c.w); |
| 1464 | } |
| 1465 | |
Josh Hunt | 32b293a | 2011-12-28 13:23:07 +0000 | [diff] [blame] | 1466 | void fib6_clean_all_ro(struct net *net, int (*func)(struct rt6_info *, void *arg), |
| 1467 | int prune, void *arg) |
| 1468 | { |
| 1469 | struct fib6_table *table; |
| 1470 | struct hlist_node *node; |
| 1471 | struct hlist_head *head; |
| 1472 | unsigned int h; |
| 1473 | |
| 1474 | rcu_read_lock(); |
| 1475 | for (h = 0; h < FIB6_TABLE_HASHSZ; h++) { |
| 1476 | head = &net->ipv6.fib_table_hash[h]; |
| 1477 | hlist_for_each_entry_rcu(table, node, head, tb6_hlist) { |
| 1478 | read_lock_bh(&table->tb6_lock); |
| 1479 | fib6_clean_tree(net, &table->tb6_root, |
| 1480 | func, prune, arg); |
| 1481 | read_unlock_bh(&table->tb6_lock); |
| 1482 | } |
| 1483 | } |
| 1484 | rcu_read_unlock(); |
| 1485 | } |
Daniel Lezcano | f3db485 | 2008-03-03 23:27:06 -0800 | [diff] [blame] | 1486 | void fib6_clean_all(struct net *net, int (*func)(struct rt6_info *, void *arg), |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 1487 | int prune, void *arg) |
| 1488 | { |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 1489 | struct fib6_table *table; |
Patrick McHardy | 1b43af5 | 2006-08-10 23:11:17 -0700 | [diff] [blame] | 1490 | struct hlist_node *node; |
Daniel Lezcano | 58f09b7 | 2008-03-03 23:25:27 -0800 | [diff] [blame] | 1491 | struct hlist_head *head; |
Patrick McHardy | 1b43af5 | 2006-08-10 23:11:17 -0700 | [diff] [blame] | 1492 | unsigned int h; |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 1493 | |
Patrick McHardy | 1b43af5 | 2006-08-10 23:11:17 -0700 | [diff] [blame] | 1494 | rcu_read_lock(); |
Neil Horman | a33bc5c | 2009-07-30 18:52:15 -0700 | [diff] [blame] | 1495 | for (h = 0; h < FIB6_TABLE_HASHSZ; h++) { |
Daniel Lezcano | f3db485 | 2008-03-03 23:27:06 -0800 | [diff] [blame] | 1496 | head = &net->ipv6.fib_table_hash[h]; |
Daniel Lezcano | 58f09b7 | 2008-03-03 23:25:27 -0800 | [diff] [blame] | 1497 | hlist_for_each_entry_rcu(table, node, head, tb6_hlist) { |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 1498 | write_lock_bh(&table->tb6_lock); |
Benjamin Thery | ec7d43c | 2008-03-03 23:31:57 -0800 | [diff] [blame] | 1499 | fib6_clean_tree(net, &table->tb6_root, |
| 1500 | func, prune, arg); |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 1501 | write_unlock_bh(&table->tb6_lock); |
| 1502 | } |
| 1503 | } |
Patrick McHardy | 1b43af5 | 2006-08-10 23:11:17 -0700 | [diff] [blame] | 1504 | rcu_read_unlock(); |
Thomas Graf | c71099a | 2006-08-04 23:20:06 -0700 | [diff] [blame] | 1505 | } |
| 1506 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1507 | static int fib6_prune_clone(struct rt6_info *rt, void *arg) |
| 1508 | { |
| 1509 | if (rt->rt6i_flags & RTF_CACHE) { |
| 1510 | RT6_TRACE("pruning clone %p\n", rt); |
| 1511 | return -1; |
| 1512 | } |
| 1513 | |
| 1514 | return 0; |
| 1515 | } |
| 1516 | |
Benjamin Thery | ec7d43c | 2008-03-03 23:31:57 -0800 | [diff] [blame] | 1517 | static void fib6_prune_clones(struct net *net, struct fib6_node *fn, |
| 1518 | struct rt6_info *rt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1519 | { |
Benjamin Thery | ec7d43c | 2008-03-03 23:31:57 -0800 | [diff] [blame] | 1520 | fib6_clean_tree(net, fn, fib6_prune_clone, 1, rt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1521 | } |
| 1522 | |
| 1523 | /* |
| 1524 | * Garbage collection |
| 1525 | */ |
| 1526 | |
| 1527 | static struct fib6_gc_args |
| 1528 | { |
| 1529 | int timeout; |
| 1530 | int more; |
| 1531 | } gc_args; |
| 1532 | |
| 1533 | static int fib6_age(struct rt6_info *rt, void *arg) |
| 1534 | { |
| 1535 | unsigned long now = jiffies; |
| 1536 | |
| 1537 | /* |
| 1538 | * check addrconf expiration here. |
| 1539 | * Routes are expired even if they are in use. |
| 1540 | * |
| 1541 | * Also age clones. Note, that clones are aged out |
| 1542 | * only if they are not in use now. |
| 1543 | */ |
| 1544 | |
David S. Miller | d191854 | 2011-12-28 20:19:20 -0500 | [diff] [blame] | 1545 | if (rt->rt6i_flags & RTF_EXPIRES && rt->dst.expires) { |
| 1546 | if (time_after(now, rt->dst.expires)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1547 | RT6_TRACE("expiring %p\n", rt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1548 | return -1; |
| 1549 | } |
| 1550 | gc_args.more++; |
| 1551 | } else if (rt->rt6i_flags & RTF_CACHE) { |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1552 | if (atomic_read(&rt->dst.__refcnt) == 0 && |
| 1553 | time_after_eq(now, rt->dst.lastuse + gc_args.timeout)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1554 | RT6_TRACE("aging clone %p\n", rt); |
| 1555 | return -1; |
David S. Miller | 5339ab8 | 2012-01-27 15:14:01 -0800 | [diff] [blame] | 1556 | } else if (rt->rt6i_flags & RTF_GATEWAY) { |
| 1557 | struct neighbour *neigh; |
| 1558 | __u8 neigh_flags = 0; |
| 1559 | |
| 1560 | neigh = dst_neigh_lookup(&rt->dst, &rt->rt6i_gateway); |
| 1561 | if (neigh) { |
| 1562 | neigh_flags = neigh->flags; |
| 1563 | neigh_release(neigh); |
| 1564 | } |
Thomas Graf | 8bd7451 | 2012-06-07 06:51:04 +0000 | [diff] [blame] | 1565 | if (!(neigh_flags & NTF_ROUTER)) { |
David S. Miller | 5339ab8 | 2012-01-27 15:14:01 -0800 | [diff] [blame] | 1566 | RT6_TRACE("purging route %p via non-router but gateway\n", |
| 1567 | rt); |
| 1568 | return -1; |
| 1569 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1570 | } |
| 1571 | gc_args.more++; |
| 1572 | } |
| 1573 | |
| 1574 | return 0; |
| 1575 | } |
| 1576 | |
| 1577 | static DEFINE_SPINLOCK(fib6_gc_lock); |
| 1578 | |
Daniel Lezcano | 5b7c931 | 2008-03-03 23:28:58 -0800 | [diff] [blame] | 1579 | void fib6_run_gc(unsigned long expires, struct net *net) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1580 | { |
Daniel Lezcano | 5b7c931 | 2008-03-03 23:28:58 -0800 | [diff] [blame] | 1581 | if (expires != ~0UL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1582 | spin_lock_bh(&fib6_gc_lock); |
Daniel Lezcano | 5b7c931 | 2008-03-03 23:28:58 -0800 | [diff] [blame] | 1583 | gc_args.timeout = expires ? (int)expires : |
| 1584 | net->ipv6.sysctl.ip6_rt_gc_interval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1585 | } else { |
Stephen Hemminger | a76d734 | 2008-07-22 14:34:35 -0700 | [diff] [blame] | 1586 | if (!spin_trylock_bh(&fib6_gc_lock)) { |
Stephen Hemminger | 417f28b | 2008-07-22 14:33:45 -0700 | [diff] [blame] | 1587 | mod_timer(&net->ipv6.ip6_fib_timer, jiffies + HZ); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1588 | return; |
| 1589 | } |
Daniel Lezcano | 5b7c931 | 2008-03-03 23:28:58 -0800 | [diff] [blame] | 1590 | gc_args.timeout = net->ipv6.sysctl.ip6_rt_gc_interval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1591 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1592 | |
Stephen Hemminger | 3d0f24a | 2008-07-22 14:35:50 -0700 | [diff] [blame] | 1593 | gc_args.more = icmp6_dst_gc(); |
Daniel Lezcano | f3db485 | 2008-03-03 23:27:06 -0800 | [diff] [blame] | 1594 | |
Daniel Lezcano | 5b7c931 | 2008-03-03 23:28:58 -0800 | [diff] [blame] | 1595 | fib6_clean_all(net, fib6_age, 0, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1596 | |
| 1597 | if (gc_args.more) |
Stephen Hemminger | c8a4522 | 2008-07-22 14:34:09 -0700 | [diff] [blame] | 1598 | mod_timer(&net->ipv6.ip6_fib_timer, |
| 1599 | round_jiffies(jiffies |
| 1600 | + net->ipv6.sysctl.ip6_rt_gc_interval)); |
Stephen Hemminger | 417f28b | 2008-07-22 14:33:45 -0700 | [diff] [blame] | 1601 | else |
| 1602 | del_timer(&net->ipv6.ip6_fib_timer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1603 | spin_unlock_bh(&fib6_gc_lock); |
| 1604 | } |
| 1605 | |
Daniel Lezcano | 5b7c931 | 2008-03-03 23:28:58 -0800 | [diff] [blame] | 1606 | static void fib6_gc_timer_cb(unsigned long arg) |
| 1607 | { |
| 1608 | fib6_run_gc(0, (struct net *)arg); |
| 1609 | } |
| 1610 | |
Alexey Dobriyan | 2c8c1e7 | 2010-01-17 03:35:32 +0000 | [diff] [blame] | 1611 | static int __net_init fib6_net_init(struct net *net) |
Daniel Lezcano | 58f09b7 | 2008-03-03 23:25:27 -0800 | [diff] [blame] | 1612 | { |
Eric Dumazet | 10da66f | 2010-10-13 08:22:03 +0000 | [diff] [blame] | 1613 | size_t size = sizeof(struct hlist_head) * FIB6_TABLE_HASHSZ; |
| 1614 | |
Stephen Hemminger | 417f28b | 2008-07-22 14:33:45 -0700 | [diff] [blame] | 1615 | setup_timer(&net->ipv6.ip6_fib_timer, fib6_gc_timer_cb, (unsigned long)net); |
Daniel Lezcano | 63152fc | 2008-03-03 23:31:11 -0800 | [diff] [blame] | 1616 | |
Benjamin Thery | c572872 | 2008-03-03 23:34:17 -0800 | [diff] [blame] | 1617 | net->ipv6.rt6_stats = kzalloc(sizeof(*net->ipv6.rt6_stats), GFP_KERNEL); |
| 1618 | if (!net->ipv6.rt6_stats) |
| 1619 | goto out_timer; |
| 1620 | |
Eric Dumazet | 10da66f | 2010-10-13 08:22:03 +0000 | [diff] [blame] | 1621 | /* Avoid false sharing : Use at least a full cache line */ |
| 1622 | size = max_t(size_t, size, L1_CACHE_BYTES); |
| 1623 | |
| 1624 | net->ipv6.fib_table_hash = kzalloc(size, GFP_KERNEL); |
Daniel Lezcano | 58f09b7 | 2008-03-03 23:25:27 -0800 | [diff] [blame] | 1625 | if (!net->ipv6.fib_table_hash) |
Benjamin Thery | c572872 | 2008-03-03 23:34:17 -0800 | [diff] [blame] | 1626 | goto out_rt6_stats; |
Daniel Lezcano | 58f09b7 | 2008-03-03 23:25:27 -0800 | [diff] [blame] | 1627 | |
| 1628 | net->ipv6.fib6_main_tbl = kzalloc(sizeof(*net->ipv6.fib6_main_tbl), |
| 1629 | GFP_KERNEL); |
| 1630 | if (!net->ipv6.fib6_main_tbl) |
| 1631 | goto out_fib_table_hash; |
| 1632 | |
| 1633 | net->ipv6.fib6_main_tbl->tb6_id = RT6_TABLE_MAIN; |
Daniel Lezcano | 8ed6778 | 2008-03-04 13:48:30 -0800 | [diff] [blame] | 1634 | net->ipv6.fib6_main_tbl->tb6_root.leaf = net->ipv6.ip6_null_entry; |
Daniel Lezcano | 58f09b7 | 2008-03-03 23:25:27 -0800 | [diff] [blame] | 1635 | net->ipv6.fib6_main_tbl->tb6_root.fn_flags = |
| 1636 | RTN_ROOT | RTN_TL_ROOT | RTN_RTINFO; |
David S. Miller | 8e77327 | 2012-06-11 00:01:52 -0700 | [diff] [blame] | 1637 | inet_peer_base_init(&net->ipv6.fib6_main_tbl->tb6_peers); |
Daniel Lezcano | 58f09b7 | 2008-03-03 23:25:27 -0800 | [diff] [blame] | 1638 | |
| 1639 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
| 1640 | net->ipv6.fib6_local_tbl = kzalloc(sizeof(*net->ipv6.fib6_local_tbl), |
| 1641 | GFP_KERNEL); |
| 1642 | if (!net->ipv6.fib6_local_tbl) |
| 1643 | goto out_fib6_main_tbl; |
| 1644 | net->ipv6.fib6_local_tbl->tb6_id = RT6_TABLE_LOCAL; |
Daniel Lezcano | 8ed6778 | 2008-03-04 13:48:30 -0800 | [diff] [blame] | 1645 | net->ipv6.fib6_local_tbl->tb6_root.leaf = net->ipv6.ip6_null_entry; |
Daniel Lezcano | 58f09b7 | 2008-03-03 23:25:27 -0800 | [diff] [blame] | 1646 | net->ipv6.fib6_local_tbl->tb6_root.fn_flags = |
| 1647 | RTN_ROOT | RTN_TL_ROOT | RTN_RTINFO; |
David S. Miller | 8e77327 | 2012-06-11 00:01:52 -0700 | [diff] [blame] | 1648 | inet_peer_base_init(&net->ipv6.fib6_local_tbl->tb6_peers); |
Daniel Lezcano | 58f09b7 | 2008-03-03 23:25:27 -0800 | [diff] [blame] | 1649 | #endif |
| 1650 | fib6_tables_init(net); |
| 1651 | |
Stephen Hemminger | 417f28b | 2008-07-22 14:33:45 -0700 | [diff] [blame] | 1652 | return 0; |
Daniel Lezcano | 58f09b7 | 2008-03-03 23:25:27 -0800 | [diff] [blame] | 1653 | |
| 1654 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
| 1655 | out_fib6_main_tbl: |
| 1656 | kfree(net->ipv6.fib6_main_tbl); |
| 1657 | #endif |
| 1658 | out_fib_table_hash: |
| 1659 | kfree(net->ipv6.fib_table_hash); |
Benjamin Thery | c572872 | 2008-03-03 23:34:17 -0800 | [diff] [blame] | 1660 | out_rt6_stats: |
| 1661 | kfree(net->ipv6.rt6_stats); |
Daniel Lezcano | 63152fc | 2008-03-03 23:31:11 -0800 | [diff] [blame] | 1662 | out_timer: |
Stephen Hemminger | 417f28b | 2008-07-22 14:33:45 -0700 | [diff] [blame] | 1663 | return -ENOMEM; |
Daniel Lezcano | 58f09b7 | 2008-03-03 23:25:27 -0800 | [diff] [blame] | 1664 | } |
| 1665 | |
| 1666 | static void fib6_net_exit(struct net *net) |
| 1667 | { |
Daniel Lezcano | 8ed6778 | 2008-03-04 13:48:30 -0800 | [diff] [blame] | 1668 | rt6_ifdown(net, NULL); |
Stephen Hemminger | 417f28b | 2008-07-22 14:33:45 -0700 | [diff] [blame] | 1669 | del_timer_sync(&net->ipv6.ip6_fib_timer); |
| 1670 | |
Daniel Lezcano | 58f09b7 | 2008-03-03 23:25:27 -0800 | [diff] [blame] | 1671 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
David S. Miller | 8e77327 | 2012-06-11 00:01:52 -0700 | [diff] [blame] | 1672 | inetpeer_invalidate_tree(&net->ipv6.fib6_local_tbl->tb6_peers); |
Daniel Lezcano | 58f09b7 | 2008-03-03 23:25:27 -0800 | [diff] [blame] | 1673 | kfree(net->ipv6.fib6_local_tbl); |
| 1674 | #endif |
David S. Miller | 8e77327 | 2012-06-11 00:01:52 -0700 | [diff] [blame] | 1675 | inetpeer_invalidate_tree(&net->ipv6.fib6_main_tbl->tb6_peers); |
Daniel Lezcano | 58f09b7 | 2008-03-03 23:25:27 -0800 | [diff] [blame] | 1676 | kfree(net->ipv6.fib6_main_tbl); |
| 1677 | kfree(net->ipv6.fib_table_hash); |
Benjamin Thery | c572872 | 2008-03-03 23:34:17 -0800 | [diff] [blame] | 1678 | kfree(net->ipv6.rt6_stats); |
Daniel Lezcano | 58f09b7 | 2008-03-03 23:25:27 -0800 | [diff] [blame] | 1679 | } |
| 1680 | |
| 1681 | static struct pernet_operations fib6_net_ops = { |
| 1682 | .init = fib6_net_init, |
| 1683 | .exit = fib6_net_exit, |
| 1684 | }; |
| 1685 | |
Daniel Lezcano | d63bddb | 2007-12-07 00:40:34 -0800 | [diff] [blame] | 1686 | int __init fib6_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1687 | { |
Daniel Lezcano | e0b85590 | 2008-03-03 23:24:31 -0800 | [diff] [blame] | 1688 | int ret = -ENOMEM; |
Daniel Lezcano | 63152fc | 2008-03-03 23:31:11 -0800 | [diff] [blame] | 1689 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1690 | fib6_node_kmem = kmem_cache_create("fib6_nodes", |
| 1691 | sizeof(struct fib6_node), |
Daniel Lezcano | f845ab6 | 2007-12-07 00:45:16 -0800 | [diff] [blame] | 1692 | 0, SLAB_HWCACHE_ALIGN, |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 1693 | NULL); |
Daniel Lezcano | f845ab6 | 2007-12-07 00:45:16 -0800 | [diff] [blame] | 1694 | if (!fib6_node_kmem) |
Daniel Lezcano | e0b85590 | 2008-03-03 23:24:31 -0800 | [diff] [blame] | 1695 | goto out; |
| 1696 | |
Daniel Lezcano | 58f09b7 | 2008-03-03 23:25:27 -0800 | [diff] [blame] | 1697 | ret = register_pernet_subsys(&fib6_net_ops); |
| 1698 | if (ret) |
Benjamin Thery | c572872 | 2008-03-03 23:34:17 -0800 | [diff] [blame] | 1699 | goto out_kmem_cache_create; |
David S. Miller | e8803b6 | 2012-06-16 01:12:19 -0700 | [diff] [blame] | 1700 | |
| 1701 | ret = __rtnl_register(PF_INET6, RTM_GETROUTE, NULL, inet6_dump_fib, |
| 1702 | NULL); |
| 1703 | if (ret) |
| 1704 | goto out_unregister_subsys; |
Daniel Lezcano | d63bddb | 2007-12-07 00:40:34 -0800 | [diff] [blame] | 1705 | out: |
| 1706 | return ret; |
| 1707 | |
David S. Miller | e8803b6 | 2012-06-16 01:12:19 -0700 | [diff] [blame] | 1708 | out_unregister_subsys: |
| 1709 | unregister_pernet_subsys(&fib6_net_ops); |
Daniel Lezcano | d63bddb | 2007-12-07 00:40:34 -0800 | [diff] [blame] | 1710 | out_kmem_cache_create: |
| 1711 | kmem_cache_destroy(fib6_node_kmem); |
| 1712 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1713 | } |
| 1714 | |
| 1715 | void fib6_gc_cleanup(void) |
| 1716 | { |
Daniel Lezcano | 58f09b7 | 2008-03-03 23:25:27 -0800 | [diff] [blame] | 1717 | unregister_pernet_subsys(&fib6_net_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1718 | kmem_cache_destroy(fib6_node_kmem); |
| 1719 | } |