Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * INET An implementation of the TCP/IP protocol suite for the LINUX |
| 3 | * operating system. INET is implemented using the BSD Socket |
| 4 | * interface as the means of communication with the user level. |
| 5 | * |
| 6 | * IPv4 Forwarding Information Base: FIB frontend. |
| 7 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or |
| 11 | * modify it under the terms of the GNU General Public License |
| 12 | * as published by the Free Software Foundation; either version |
| 13 | * 2 of the License, or (at your option) any later version. |
| 14 | */ |
| 15 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | #include <linux/module.h> |
| 17 | #include <asm/uaccess.h> |
| 18 | #include <asm/system.h> |
| 19 | #include <linux/bitops.h> |
Randy Dunlap | 4fc268d | 2006-01-11 12:17:47 -0800 | [diff] [blame] | 20 | #include <linux/capability.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | #include <linux/types.h> |
| 22 | #include <linux/kernel.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | #include <linux/mm.h> |
| 24 | #include <linux/string.h> |
| 25 | #include <linux/socket.h> |
| 26 | #include <linux/sockios.h> |
| 27 | #include <linux/errno.h> |
| 28 | #include <linux/in.h> |
| 29 | #include <linux/inet.h> |
Arnaldo Carvalho de Melo | 14c8502 | 2005-12-27 02:43:12 -0200 | [diff] [blame] | 30 | #include <linux/inetdevice.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | #include <linux/netdevice.h> |
Thomas Graf | 1823730 | 2006-08-04 23:04:54 -0700 | [diff] [blame] | 32 | #include <linux/if_addr.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | #include <linux/if_arp.h> |
| 34 | #include <linux/skbuff.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | #include <linux/init.h> |
Patrick McHardy | 1af5a8c | 2006-08-10 23:10:46 -0700 | [diff] [blame] | 36 | #include <linux/list.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | |
| 38 | #include <net/ip.h> |
| 39 | #include <net/protocol.h> |
| 40 | #include <net/route.h> |
| 41 | #include <net/tcp.h> |
| 42 | #include <net/sock.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | #include <net/arp.h> |
| 44 | #include <net/ip_fib.h> |
Thomas Graf | 63f3444 | 2007-03-22 11:55:17 -0700 | [diff] [blame] | 45 | #include <net/rtnetlink.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | #ifndef CONFIG_IP_MULTIPLE_TABLES |
| 48 | |
Denis V. Lunev | 7b1a74f | 2008-01-10 03:22:17 -0800 | [diff] [blame] | 49 | static int __net_init fib4_rules_init(struct net *net) |
Pavel Emelyanov | c3e9a35 | 2007-11-06 23:34:04 -0800 | [diff] [blame] | 50 | { |
Denis V. Lunev | 93456b6 | 2008-01-10 03:23:38 -0800 | [diff] [blame] | 51 | struct fib_table *local_table, *main_table; |
| 52 | |
Stephen Hemminger | 7f9b805 | 2008-01-14 23:14:20 -0800 | [diff] [blame] | 53 | local_table = fib_hash_table(RT_TABLE_LOCAL); |
Denis V. Lunev | 93456b6 | 2008-01-10 03:23:38 -0800 | [diff] [blame] | 54 | if (local_table == NULL) |
Denis V. Lunev | dbb5016 | 2008-01-10 03:21:49 -0800 | [diff] [blame] | 55 | return -ENOMEM; |
| 56 | |
Stephen Hemminger | 7f9b805 | 2008-01-14 23:14:20 -0800 | [diff] [blame] | 57 | main_table = fib_hash_table(RT_TABLE_MAIN); |
Denis V. Lunev | 93456b6 | 2008-01-10 03:23:38 -0800 | [diff] [blame] | 58 | if (main_table == NULL) |
Denis V. Lunev | dbb5016 | 2008-01-10 03:21:49 -0800 | [diff] [blame] | 59 | goto fail; |
| 60 | |
Denis V. Lunev | 93456b6 | 2008-01-10 03:23:38 -0800 | [diff] [blame] | 61 | hlist_add_head_rcu(&local_table->tb_hlist, |
Denis V. Lunev | e4aef8a | 2008-01-10 03:28:24 -0800 | [diff] [blame] | 62 | &net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX]); |
Denis V. Lunev | 93456b6 | 2008-01-10 03:23:38 -0800 | [diff] [blame] | 63 | hlist_add_head_rcu(&main_table->tb_hlist, |
Denis V. Lunev | e4aef8a | 2008-01-10 03:28:24 -0800 | [diff] [blame] | 64 | &net->ipv4.fib_table_hash[TABLE_MAIN_INDEX]); |
Denis V. Lunev | dbb5016 | 2008-01-10 03:21:49 -0800 | [diff] [blame] | 65 | return 0; |
| 66 | |
| 67 | fail: |
Denis V. Lunev | 93456b6 | 2008-01-10 03:23:38 -0800 | [diff] [blame] | 68 | kfree(local_table); |
Denis V. Lunev | dbb5016 | 2008-01-10 03:21:49 -0800 | [diff] [blame] | 69 | return -ENOMEM; |
Pavel Emelyanov | c3e9a35 | 2007-11-06 23:34:04 -0800 | [diff] [blame] | 70 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | #else |
| 72 | |
Denis V. Lunev | 8ad4942 | 2008-01-10 03:24:11 -0800 | [diff] [blame] | 73 | struct fib_table *fib_new_table(struct net *net, u32 id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | { |
| 75 | struct fib_table *tb; |
Patrick McHardy | 1af5a8c | 2006-08-10 23:10:46 -0700 | [diff] [blame] | 76 | unsigned int h; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | |
Patrick McHardy | 1af5a8c | 2006-08-10 23:10:46 -0700 | [diff] [blame] | 78 | if (id == 0) |
| 79 | id = RT_TABLE_MAIN; |
Denis V. Lunev | 8ad4942 | 2008-01-10 03:24:11 -0800 | [diff] [blame] | 80 | tb = fib_get_table(net, id); |
Patrick McHardy | 1af5a8c | 2006-08-10 23:10:46 -0700 | [diff] [blame] | 81 | if (tb) |
| 82 | return tb; |
Stephen Hemminger | 7f9b805 | 2008-01-14 23:14:20 -0800 | [diff] [blame] | 83 | |
| 84 | tb = fib_hash_table(id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | if (!tb) |
| 86 | return NULL; |
Patrick McHardy | 1af5a8c | 2006-08-10 23:10:46 -0700 | [diff] [blame] | 87 | h = id & (FIB_TABLE_HASHSZ - 1); |
Denis V. Lunev | e4aef8a | 2008-01-10 03:28:24 -0800 | [diff] [blame] | 88 | hlist_add_head_rcu(&tb->tb_hlist, &net->ipv4.fib_table_hash[h]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | return tb; |
| 90 | } |
| 91 | |
Denis V. Lunev | 8ad4942 | 2008-01-10 03:24:11 -0800 | [diff] [blame] | 92 | struct fib_table *fib_get_table(struct net *net, u32 id) |
Patrick McHardy | 1af5a8c | 2006-08-10 23:10:46 -0700 | [diff] [blame] | 93 | { |
| 94 | struct fib_table *tb; |
| 95 | struct hlist_node *node; |
Denis V. Lunev | e4aef8a | 2008-01-10 03:28:24 -0800 | [diff] [blame] | 96 | struct hlist_head *head; |
Patrick McHardy | 1af5a8c | 2006-08-10 23:10:46 -0700 | [diff] [blame] | 97 | unsigned int h; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | |
Patrick McHardy | 1af5a8c | 2006-08-10 23:10:46 -0700 | [diff] [blame] | 99 | if (id == 0) |
| 100 | id = RT_TABLE_MAIN; |
| 101 | h = id & (FIB_TABLE_HASHSZ - 1); |
Denis V. Lunev | e4aef8a | 2008-01-10 03:28:24 -0800 | [diff] [blame] | 102 | |
Patrick McHardy | 1af5a8c | 2006-08-10 23:10:46 -0700 | [diff] [blame] | 103 | rcu_read_lock(); |
Denis V. Lunev | e4aef8a | 2008-01-10 03:28:24 -0800 | [diff] [blame] | 104 | head = &net->ipv4.fib_table_hash[h]; |
| 105 | hlist_for_each_entry_rcu(tb, node, head, tb_hlist) { |
Patrick McHardy | 1af5a8c | 2006-08-10 23:10:46 -0700 | [diff] [blame] | 106 | if (tb->tb_id == id) { |
| 107 | rcu_read_unlock(); |
| 108 | return tb; |
| 109 | } |
| 110 | } |
| 111 | rcu_read_unlock(); |
| 112 | return NULL; |
| 113 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | #endif /* CONFIG_IP_MULTIPLE_TABLES */ |
| 115 | |
Denis V. Lunev | 010278e | 2008-01-22 22:04:04 -0800 | [diff] [blame] | 116 | void fib_select_default(struct net *net, |
| 117 | const struct flowi *flp, struct fib_result *res) |
Denis V. Lunev | 64c2d53 | 2008-01-22 22:03:33 -0800 | [diff] [blame] | 118 | { |
| 119 | struct fib_table *tb; |
| 120 | int table = RT_TABLE_MAIN; |
| 121 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
| 122 | if (res->r == NULL || res->r->action != FR_ACT_TO_TBL) |
| 123 | return; |
| 124 | table = res->r->table; |
| 125 | #endif |
Denis V. Lunev | 010278e | 2008-01-22 22:04:04 -0800 | [diff] [blame] | 126 | tb = fib_get_table(net, table); |
Denis V. Lunev | 64c2d53 | 2008-01-22 22:03:33 -0800 | [diff] [blame] | 127 | if (FIB_RES_GW(*res) && FIB_RES_NH(*res).nh_scope == RT_SCOPE_LINK) |
Stephen Hemminger | 16c6cf8 | 2009-09-20 10:35:36 +0000 | [diff] [blame] | 128 | fib_table_select_default(tb, flp, res); |
Denis V. Lunev | 64c2d53 | 2008-01-22 22:03:33 -0800 | [diff] [blame] | 129 | } |
| 130 | |
Denis V. Lunev | e4aef8a | 2008-01-10 03:28:24 -0800 | [diff] [blame] | 131 | static void fib_flush(struct net *net) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 132 | { |
| 133 | int flushed = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | struct fib_table *tb; |
Patrick McHardy | 1af5a8c | 2006-08-10 23:10:46 -0700 | [diff] [blame] | 135 | struct hlist_node *node; |
Denis V. Lunev | e4aef8a | 2008-01-10 03:28:24 -0800 | [diff] [blame] | 136 | struct hlist_head *head; |
Patrick McHardy | 1af5a8c | 2006-08-10 23:10:46 -0700 | [diff] [blame] | 137 | unsigned int h; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 138 | |
Patrick McHardy | 1af5a8c | 2006-08-10 23:10:46 -0700 | [diff] [blame] | 139 | for (h = 0; h < FIB_TABLE_HASHSZ; h++) { |
Denis V. Lunev | e4aef8a | 2008-01-10 03:28:24 -0800 | [diff] [blame] | 140 | head = &net->ipv4.fib_table_hash[h]; |
| 141 | hlist_for_each_entry(tb, node, head, tb_hlist) |
Stephen Hemminger | 16c6cf8 | 2009-09-20 10:35:36 +0000 | [diff] [blame] | 142 | flushed += fib_table_flush(tb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 143 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 144 | |
| 145 | if (flushed) |
Denis V. Lunev | 76e6ebf | 2008-07-05 19:00:44 -0700 | [diff] [blame] | 146 | rt_cache_flush(net, -1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | } |
| 148 | |
| 149 | /* |
| 150 | * Find the first device with a given source address. |
| 151 | */ |
| 152 | |
Denis V. Lunev | 1ab3527 | 2008-01-22 22:04:30 -0800 | [diff] [blame] | 153 | struct net_device * ip_dev_find(struct net *net, __be32 addr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | { |
| 155 | struct flowi fl = { .nl_u = { .ip4_u = { .daddr = addr } } }; |
| 156 | struct fib_result res; |
| 157 | struct net_device *dev = NULL; |
Pavel Emelyanov | 03cf786 | 2007-10-23 21:17:27 -0700 | [diff] [blame] | 158 | struct fib_table *local_table; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | |
| 160 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
| 161 | res.r = NULL; |
| 162 | #endif |
| 163 | |
Denis V. Lunev | 1ab3527 | 2008-01-22 22:04:30 -0800 | [diff] [blame] | 164 | local_table = fib_get_table(net, RT_TABLE_LOCAL); |
Stephen Hemminger | 16c6cf8 | 2009-09-20 10:35:36 +0000 | [diff] [blame] | 165 | if (!local_table || fib_table_lookup(local_table, &fl, &res)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | return NULL; |
| 167 | if (res.type != RTN_LOCAL) |
| 168 | goto out; |
| 169 | dev = FIB_RES_DEV(res); |
| 170 | |
| 171 | if (dev) |
| 172 | dev_hold(dev); |
| 173 | out: |
| 174 | fib_res_put(&res); |
| 175 | return dev; |
| 176 | } |
| 177 | |
Laszlo Attila Toth | 0553811 | 2007-12-04 23:28:46 -0800 | [diff] [blame] | 178 | /* |
| 179 | * Find address type as if only "dev" was present in the system. If |
| 180 | * on_dev is NULL then all interfaces are taken into consideration. |
| 181 | */ |
Eric W. Biederman | 6b175b2 | 2008-01-10 03:25:28 -0800 | [diff] [blame] | 182 | static inline unsigned __inet_dev_addr_type(struct net *net, |
| 183 | const struct net_device *dev, |
Laszlo Attila Toth | 0553811 | 2007-12-04 23:28:46 -0800 | [diff] [blame] | 184 | __be32 addr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 185 | { |
| 186 | struct flowi fl = { .nl_u = { .ip4_u = { .daddr = addr } } }; |
| 187 | struct fib_result res; |
| 188 | unsigned ret = RTN_BROADCAST; |
Pavel Emelyanov | 03cf786 | 2007-10-23 21:17:27 -0700 | [diff] [blame] | 189 | struct fib_table *local_table; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 190 | |
Jan Engelhardt | 1e637c7 | 2008-01-21 03:18:08 -0800 | [diff] [blame] | 191 | if (ipv4_is_zeronet(addr) || ipv4_is_lbcast(addr)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 192 | return RTN_BROADCAST; |
Joe Perches | f97c1e0 | 2007-12-16 13:45:43 -0800 | [diff] [blame] | 193 | if (ipv4_is_multicast(addr)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 194 | return RTN_MULTICAST; |
| 195 | |
| 196 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
| 197 | res.r = NULL; |
| 198 | #endif |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 199 | |
Eric W. Biederman | 6b175b2 | 2008-01-10 03:25:28 -0800 | [diff] [blame] | 200 | local_table = fib_get_table(net, RT_TABLE_LOCAL); |
Pavel Emelyanov | 03cf786 | 2007-10-23 21:17:27 -0700 | [diff] [blame] | 201 | if (local_table) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 202 | ret = RTN_UNICAST; |
Stephen Hemminger | 16c6cf8 | 2009-09-20 10:35:36 +0000 | [diff] [blame] | 203 | if (!fib_table_lookup(local_table, &fl, &res)) { |
Laszlo Attila Toth | 0553811 | 2007-12-04 23:28:46 -0800 | [diff] [blame] | 204 | if (!dev || dev == res.fi->fib_dev) |
| 205 | ret = res.type; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 206 | fib_res_put(&res); |
| 207 | } |
| 208 | } |
| 209 | return ret; |
| 210 | } |
| 211 | |
Eric W. Biederman | 6b175b2 | 2008-01-10 03:25:28 -0800 | [diff] [blame] | 212 | unsigned int inet_addr_type(struct net *net, __be32 addr) |
Laszlo Attila Toth | 0553811 | 2007-12-04 23:28:46 -0800 | [diff] [blame] | 213 | { |
Eric W. Biederman | 6b175b2 | 2008-01-10 03:25:28 -0800 | [diff] [blame] | 214 | return __inet_dev_addr_type(net, NULL, addr); |
Laszlo Attila Toth | 0553811 | 2007-12-04 23:28:46 -0800 | [diff] [blame] | 215 | } |
| 216 | |
Eric W. Biederman | 6b175b2 | 2008-01-10 03:25:28 -0800 | [diff] [blame] | 217 | unsigned int inet_dev_addr_type(struct net *net, const struct net_device *dev, |
| 218 | __be32 addr) |
Laszlo Attila Toth | 0553811 | 2007-12-04 23:28:46 -0800 | [diff] [blame] | 219 | { |
Eric W. Biederman | 6b175b2 | 2008-01-10 03:25:28 -0800 | [diff] [blame] | 220 | return __inet_dev_addr_type(net, dev, addr); |
Laszlo Attila Toth | 0553811 | 2007-12-04 23:28:46 -0800 | [diff] [blame] | 221 | } |
| 222 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 223 | /* Given (packet source, input interface) and optional (dst, oif, tos): |
| 224 | - (main) check, that source is valid i.e. not broadcast or our local |
| 225 | address. |
| 226 | - figure out what "logical" interface this packet arrived |
| 227 | and calculate "specific destination" address. |
| 228 | - check, that packet arrived from expected physical interface. |
| 229 | */ |
| 230 | |
Al Viro | d9c9df8 | 2006-09-26 21:28:14 -0700 | [diff] [blame] | 231 | int fib_validate_source(__be32 src, __be32 dst, u8 tos, int oif, |
jamal | b0c110c | 2009-10-18 02:12:33 +0000 | [diff] [blame] | 232 | struct net_device *dev, __be32 *spec_dst, |
| 233 | u32 *itag, u32 mark) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 234 | { |
| 235 | struct in_device *in_dev; |
| 236 | struct flowi fl = { .nl_u = { .ip4_u = |
| 237 | { .daddr = src, |
| 238 | .saddr = dst, |
| 239 | .tos = tos } }, |
jamal | b0c110c | 2009-10-18 02:12:33 +0000 | [diff] [blame] | 240 | .mark = mark, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 241 | .iif = oif }; |
jamal | b0c110c | 2009-10-18 02:12:33 +0000 | [diff] [blame] | 242 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 243 | struct fib_result res; |
Patrick McHardy | 8153a10 | 2009-12-03 01:25:58 +0000 | [diff] [blame] | 244 | int no_addr, rpf, accept_local; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 245 | int ret; |
Denis V. Lunev | 5b707aa | 2008-01-21 17:33:15 -0800 | [diff] [blame] | 246 | struct net *net; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | |
Patrick McHardy | 8153a10 | 2009-12-03 01:25:58 +0000 | [diff] [blame] | 248 | no_addr = rpf = accept_local = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 249 | rcu_read_lock(); |
Herbert Xu | e5ed639 | 2005-10-03 14:35:55 -0700 | [diff] [blame] | 250 | in_dev = __in_dev_get_rcu(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 251 | if (in_dev) { |
| 252 | no_addr = in_dev->ifa_list == NULL; |
| 253 | rpf = IN_DEV_RPFILTER(in_dev); |
Patrick McHardy | 8153a10 | 2009-12-03 01:25:58 +0000 | [diff] [blame] | 254 | accept_local = IN_DEV_ACCEPT_LOCAL(in_dev); |
Jamal Hadi Salim | 28f6aee | 2009-12-25 17:30:22 -0800 | [diff] [blame] | 255 | if (mark && !IN_DEV_SRC_VMARK(in_dev)) |
| 256 | fl.mark = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 257 | } |
| 258 | rcu_read_unlock(); |
| 259 | |
| 260 | if (in_dev == NULL) |
| 261 | goto e_inval; |
| 262 | |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 263 | net = dev_net(dev); |
Denis V. Lunev | 5b707aa | 2008-01-21 17:33:15 -0800 | [diff] [blame] | 264 | if (fib_lookup(net, &fl, &res)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 265 | goto last_resort; |
Patrick McHardy | 8153a10 | 2009-12-03 01:25:58 +0000 | [diff] [blame] | 266 | if (res.type != RTN_UNICAST) { |
| 267 | if (res.type != RTN_LOCAL || !accept_local) |
| 268 | goto e_inval_res; |
| 269 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 270 | *spec_dst = FIB_RES_PREFSRC(res); |
| 271 | fib_combine_itag(itag, &res); |
| 272 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
| 273 | if (FIB_RES_DEV(res) == dev || res.fi->fib_nhs > 1) |
| 274 | #else |
| 275 | if (FIB_RES_DEV(res) == dev) |
| 276 | #endif |
| 277 | { |
| 278 | ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST; |
| 279 | fib_res_put(&res); |
| 280 | return ret; |
| 281 | } |
| 282 | fib_res_put(&res); |
| 283 | if (no_addr) |
| 284 | goto last_resort; |
Stephen Hemminger | c1cf842 | 2009-02-20 08:25:36 +0000 | [diff] [blame] | 285 | if (rpf == 1) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 286 | goto e_inval; |
| 287 | fl.oif = dev->ifindex; |
| 288 | |
| 289 | ret = 0; |
Denis V. Lunev | 5b707aa | 2008-01-21 17:33:15 -0800 | [diff] [blame] | 290 | if (fib_lookup(net, &fl, &res) == 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 291 | if (res.type == RTN_UNICAST) { |
| 292 | *spec_dst = FIB_RES_PREFSRC(res); |
| 293 | ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST; |
| 294 | } |
| 295 | fib_res_put(&res); |
| 296 | } |
| 297 | return ret; |
| 298 | |
| 299 | last_resort: |
| 300 | if (rpf) |
| 301 | goto e_inval; |
| 302 | *spec_dst = inet_select_addr(dev, 0, RT_SCOPE_UNIVERSE); |
| 303 | *itag = 0; |
| 304 | return 0; |
| 305 | |
| 306 | e_inval_res: |
| 307 | fib_res_put(&res); |
| 308 | e_inval: |
| 309 | return -EINVAL; |
| 310 | } |
| 311 | |
Al Viro | 81f7bf6 | 2006-09-27 18:40:00 -0700 | [diff] [blame] | 312 | static inline __be32 sk_extract_addr(struct sockaddr *addr) |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 313 | { |
| 314 | return ((struct sockaddr_in *) addr)->sin_addr.s_addr; |
| 315 | } |
| 316 | |
| 317 | static int put_rtax(struct nlattr *mx, int len, int type, u32 value) |
| 318 | { |
| 319 | struct nlattr *nla; |
| 320 | |
| 321 | nla = (struct nlattr *) ((char *) mx + len); |
| 322 | nla->nla_type = type; |
| 323 | nla->nla_len = nla_attr_size(4); |
| 324 | *(u32 *) nla_data(nla) = value; |
| 325 | |
| 326 | return len + nla_total_size(4); |
| 327 | } |
| 328 | |
Denis V. Lunev | 4b5d47d | 2008-01-10 03:29:23 -0800 | [diff] [blame] | 329 | static int rtentry_to_fib_config(struct net *net, int cmd, struct rtentry *rt, |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 330 | struct fib_config *cfg) |
| 331 | { |
Al Viro | 6d85c10 | 2006-09-26 22:15:46 -0700 | [diff] [blame] | 332 | __be32 addr; |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 333 | int plen; |
| 334 | |
| 335 | memset(cfg, 0, sizeof(*cfg)); |
Denis V. Lunev | 4b5d47d | 2008-01-10 03:29:23 -0800 | [diff] [blame] | 336 | cfg->fc_nlinfo.nl_net = net; |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 337 | |
| 338 | if (rt->rt_dst.sa_family != AF_INET) |
| 339 | return -EAFNOSUPPORT; |
| 340 | |
| 341 | /* |
| 342 | * Check mask for validity: |
| 343 | * a) it must be contiguous. |
| 344 | * b) destination must have all host bits clear. |
| 345 | * c) if application forgot to set correct family (AF_INET), |
| 346 | * reject request unless it is absolutely clear i.e. |
| 347 | * both family and mask are zero. |
| 348 | */ |
| 349 | plen = 32; |
| 350 | addr = sk_extract_addr(&rt->rt_dst); |
| 351 | if (!(rt->rt_flags & RTF_HOST)) { |
Al Viro | 81f7bf6 | 2006-09-27 18:40:00 -0700 | [diff] [blame] | 352 | __be32 mask = sk_extract_addr(&rt->rt_genmask); |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 353 | |
| 354 | if (rt->rt_genmask.sa_family != AF_INET) { |
| 355 | if (mask || rt->rt_genmask.sa_family) |
| 356 | return -EAFNOSUPPORT; |
| 357 | } |
| 358 | |
| 359 | if (bad_mask(mask, addr)) |
| 360 | return -EINVAL; |
| 361 | |
| 362 | plen = inet_mask_len(mask); |
| 363 | } |
| 364 | |
| 365 | cfg->fc_dst_len = plen; |
| 366 | cfg->fc_dst = addr; |
| 367 | |
| 368 | if (cmd != SIOCDELRT) { |
| 369 | cfg->fc_nlflags = NLM_F_CREATE; |
| 370 | cfg->fc_protocol = RTPROT_BOOT; |
| 371 | } |
| 372 | |
| 373 | if (rt->rt_metric) |
| 374 | cfg->fc_priority = rt->rt_metric - 1; |
| 375 | |
| 376 | if (rt->rt_flags & RTF_REJECT) { |
| 377 | cfg->fc_scope = RT_SCOPE_HOST; |
| 378 | cfg->fc_type = RTN_UNREACHABLE; |
| 379 | return 0; |
| 380 | } |
| 381 | |
| 382 | cfg->fc_scope = RT_SCOPE_NOWHERE; |
| 383 | cfg->fc_type = RTN_UNICAST; |
| 384 | |
| 385 | if (rt->rt_dev) { |
| 386 | char *colon; |
| 387 | struct net_device *dev; |
| 388 | char devname[IFNAMSIZ]; |
| 389 | |
| 390 | if (copy_from_user(devname, rt->rt_dev, IFNAMSIZ-1)) |
| 391 | return -EFAULT; |
| 392 | |
| 393 | devname[IFNAMSIZ-1] = 0; |
| 394 | colon = strchr(devname, ':'); |
| 395 | if (colon) |
| 396 | *colon = 0; |
Denis V. Lunev | 4b5d47d | 2008-01-10 03:29:23 -0800 | [diff] [blame] | 397 | dev = __dev_get_by_name(net, devname); |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 398 | if (!dev) |
| 399 | return -ENODEV; |
| 400 | cfg->fc_oif = dev->ifindex; |
| 401 | if (colon) { |
| 402 | struct in_ifaddr *ifa; |
| 403 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
| 404 | if (!in_dev) |
| 405 | return -ENODEV; |
| 406 | *colon = ':'; |
| 407 | for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) |
| 408 | if (strcmp(ifa->ifa_label, devname) == 0) |
| 409 | break; |
| 410 | if (ifa == NULL) |
| 411 | return -ENODEV; |
| 412 | cfg->fc_prefsrc = ifa->ifa_local; |
| 413 | } |
| 414 | } |
| 415 | |
| 416 | addr = sk_extract_addr(&rt->rt_gateway); |
| 417 | if (rt->rt_gateway.sa_family == AF_INET && addr) { |
| 418 | cfg->fc_gw = addr; |
| 419 | if (rt->rt_flags & RTF_GATEWAY && |
Denis V. Lunev | 4b5d47d | 2008-01-10 03:29:23 -0800 | [diff] [blame] | 420 | inet_addr_type(net, addr) == RTN_UNICAST) |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 421 | cfg->fc_scope = RT_SCOPE_UNIVERSE; |
| 422 | } |
| 423 | |
| 424 | if (cmd == SIOCDELRT) |
| 425 | return 0; |
| 426 | |
| 427 | if (rt->rt_flags & RTF_GATEWAY && !cfg->fc_gw) |
| 428 | return -EINVAL; |
| 429 | |
| 430 | if (cfg->fc_scope == RT_SCOPE_NOWHERE) |
| 431 | cfg->fc_scope = RT_SCOPE_LINK; |
| 432 | |
| 433 | if (rt->rt_flags & (RTF_MTU | RTF_WINDOW | RTF_IRTT)) { |
| 434 | struct nlattr *mx; |
| 435 | int len = 0; |
| 436 | |
| 437 | mx = kzalloc(3 * nla_total_size(4), GFP_KERNEL); |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 438 | if (mx == NULL) |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 439 | return -ENOMEM; |
| 440 | |
| 441 | if (rt->rt_flags & RTF_MTU) |
| 442 | len = put_rtax(mx, len, RTAX_ADVMSS, rt->rt_mtu - 40); |
| 443 | |
| 444 | if (rt->rt_flags & RTF_WINDOW) |
| 445 | len = put_rtax(mx, len, RTAX_WINDOW, rt->rt_window); |
| 446 | |
| 447 | if (rt->rt_flags & RTF_IRTT) |
| 448 | len = put_rtax(mx, len, RTAX_RTT, rt->rt_irtt << 3); |
| 449 | |
| 450 | cfg->fc_mx = mx; |
| 451 | cfg->fc_mx_len = len; |
| 452 | } |
| 453 | |
| 454 | return 0; |
| 455 | } |
| 456 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 457 | /* |
| 458 | * Handle IP routing ioctl calls. These are used to manipulate the routing tables |
| 459 | */ |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 460 | |
Denis V. Lunev | 1bad118 | 2008-01-10 03:29:53 -0800 | [diff] [blame] | 461 | int ip_rt_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 462 | { |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 463 | struct fib_config cfg; |
| 464 | struct rtentry rt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 465 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 466 | |
| 467 | switch (cmd) { |
| 468 | case SIOCADDRT: /* Add a route */ |
| 469 | case SIOCDELRT: /* Delete a route */ |
| 470 | if (!capable(CAP_NET_ADMIN)) |
| 471 | return -EPERM; |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 472 | |
| 473 | if (copy_from_user(&rt, arg, sizeof(rt))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 474 | return -EFAULT; |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 475 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 476 | rtnl_lock(); |
Denis V. Lunev | 1bad118 | 2008-01-10 03:29:53 -0800 | [diff] [blame] | 477 | err = rtentry_to_fib_config(net, cmd, &rt, &cfg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 478 | if (err == 0) { |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 479 | struct fib_table *tb; |
| 480 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 481 | if (cmd == SIOCDELRT) { |
Denis V. Lunev | 1bad118 | 2008-01-10 03:29:53 -0800 | [diff] [blame] | 482 | tb = fib_get_table(net, cfg.fc_table); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 483 | if (tb) |
Stephen Hemminger | 16c6cf8 | 2009-09-20 10:35:36 +0000 | [diff] [blame] | 484 | err = fib_table_delete(tb, &cfg); |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 485 | else |
| 486 | err = -ESRCH; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 487 | } else { |
Denis V. Lunev | 1bad118 | 2008-01-10 03:29:53 -0800 | [diff] [blame] | 488 | tb = fib_new_table(net, cfg.fc_table); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 489 | if (tb) |
Stephen Hemminger | 16c6cf8 | 2009-09-20 10:35:36 +0000 | [diff] [blame] | 490 | err = fib_table_insert(tb, &cfg); |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 491 | else |
| 492 | err = -ENOBUFS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 493 | } |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 494 | |
| 495 | /* allocated by rtentry_to_fib_config() */ |
| 496 | kfree(cfg.fc_mx); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 497 | } |
| 498 | rtnl_unlock(); |
| 499 | return err; |
| 500 | } |
| 501 | return -EINVAL; |
| 502 | } |
| 503 | |
Patrick McHardy | ef7c79e | 2007-06-05 12:38:30 -0700 | [diff] [blame] | 504 | const struct nla_policy rtm_ipv4_policy[RTA_MAX+1] = { |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 505 | [RTA_DST] = { .type = NLA_U32 }, |
| 506 | [RTA_SRC] = { .type = NLA_U32 }, |
| 507 | [RTA_IIF] = { .type = NLA_U32 }, |
| 508 | [RTA_OIF] = { .type = NLA_U32 }, |
| 509 | [RTA_GATEWAY] = { .type = NLA_U32 }, |
| 510 | [RTA_PRIORITY] = { .type = NLA_U32 }, |
| 511 | [RTA_PREFSRC] = { .type = NLA_U32 }, |
| 512 | [RTA_METRICS] = { .type = NLA_NESTED }, |
Thomas Graf | 5176f91 | 2006-08-26 20:13:18 -0700 | [diff] [blame] | 513 | [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) }, |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 514 | [RTA_FLOW] = { .type = NLA_U32 }, |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 515 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 516 | |
Denis V. Lunev | 4b5d47d | 2008-01-10 03:29:23 -0800 | [diff] [blame] | 517 | static int rtm_to_fib_config(struct net *net, struct sk_buff *skb, |
| 518 | struct nlmsghdr *nlh, struct fib_config *cfg) |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 519 | { |
| 520 | struct nlattr *attr; |
| 521 | int err, remaining; |
| 522 | struct rtmsg *rtm; |
| 523 | |
| 524 | err = nlmsg_validate(nlh, sizeof(*rtm), RTA_MAX, rtm_ipv4_policy); |
| 525 | if (err < 0) |
| 526 | goto errout; |
| 527 | |
| 528 | memset(cfg, 0, sizeof(*cfg)); |
| 529 | |
| 530 | rtm = nlmsg_data(nlh); |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 531 | cfg->fc_dst_len = rtm->rtm_dst_len; |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 532 | cfg->fc_tos = rtm->rtm_tos; |
| 533 | cfg->fc_table = rtm->rtm_table; |
| 534 | cfg->fc_protocol = rtm->rtm_protocol; |
| 535 | cfg->fc_scope = rtm->rtm_scope; |
| 536 | cfg->fc_type = rtm->rtm_type; |
| 537 | cfg->fc_flags = rtm->rtm_flags; |
| 538 | cfg->fc_nlflags = nlh->nlmsg_flags; |
| 539 | |
| 540 | cfg->fc_nlinfo.pid = NETLINK_CB(skb).pid; |
| 541 | cfg->fc_nlinfo.nlh = nlh; |
Denis V. Lunev | 4b5d47d | 2008-01-10 03:29:23 -0800 | [diff] [blame] | 542 | cfg->fc_nlinfo.nl_net = net; |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 543 | |
Thomas Graf | a0ee18b | 2007-03-24 20:32:54 -0700 | [diff] [blame] | 544 | if (cfg->fc_type > RTN_MAX) { |
| 545 | err = -EINVAL; |
| 546 | goto errout; |
| 547 | } |
| 548 | |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 549 | nlmsg_for_each_attr(attr, nlh, sizeof(struct rtmsg), remaining) { |
Thomas Graf | 8f4c1f9 | 2007-09-12 14:44:36 +0200 | [diff] [blame] | 550 | switch (nla_type(attr)) { |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 551 | case RTA_DST: |
Al Viro | 17fb2c6 | 2006-09-26 22:15:25 -0700 | [diff] [blame] | 552 | cfg->fc_dst = nla_get_be32(attr); |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 553 | break; |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 554 | case RTA_OIF: |
| 555 | cfg->fc_oif = nla_get_u32(attr); |
| 556 | break; |
| 557 | case RTA_GATEWAY: |
Al Viro | 17fb2c6 | 2006-09-26 22:15:25 -0700 | [diff] [blame] | 558 | cfg->fc_gw = nla_get_be32(attr); |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 559 | break; |
| 560 | case RTA_PRIORITY: |
| 561 | cfg->fc_priority = nla_get_u32(attr); |
| 562 | break; |
| 563 | case RTA_PREFSRC: |
Al Viro | 17fb2c6 | 2006-09-26 22:15:25 -0700 | [diff] [blame] | 564 | cfg->fc_prefsrc = nla_get_be32(attr); |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 565 | break; |
| 566 | case RTA_METRICS: |
| 567 | cfg->fc_mx = nla_data(attr); |
| 568 | cfg->fc_mx_len = nla_len(attr); |
| 569 | break; |
| 570 | case RTA_MULTIPATH: |
| 571 | cfg->fc_mp = nla_data(attr); |
| 572 | cfg->fc_mp_len = nla_len(attr); |
| 573 | break; |
| 574 | case RTA_FLOW: |
| 575 | cfg->fc_flow = nla_get_u32(attr); |
| 576 | break; |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 577 | case RTA_TABLE: |
| 578 | cfg->fc_table = nla_get_u32(attr); |
| 579 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 580 | } |
| 581 | } |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 582 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 583 | return 0; |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 584 | errout: |
| 585 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 586 | } |
| 587 | |
Jianjun Kong | 6ed2533 | 2008-11-03 00:25:16 -0800 | [diff] [blame] | 588 | static int inet_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 589 | { |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 590 | struct net *net = sock_net(skb->sk); |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 591 | struct fib_config cfg; |
| 592 | struct fib_table *tb; |
| 593 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 594 | |
Denis V. Lunev | 4b5d47d | 2008-01-10 03:29:23 -0800 | [diff] [blame] | 595 | err = rtm_to_fib_config(net, skb, nlh, &cfg); |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 596 | if (err < 0) |
| 597 | goto errout; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 598 | |
Denis V. Lunev | 8ad4942 | 2008-01-10 03:24:11 -0800 | [diff] [blame] | 599 | tb = fib_get_table(net, cfg.fc_table); |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 600 | if (tb == NULL) { |
| 601 | err = -ESRCH; |
| 602 | goto errout; |
| 603 | } |
| 604 | |
Stephen Hemminger | 16c6cf8 | 2009-09-20 10:35:36 +0000 | [diff] [blame] | 605 | err = fib_table_delete(tb, &cfg); |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 606 | errout: |
| 607 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 608 | } |
| 609 | |
Jianjun Kong | 6ed2533 | 2008-11-03 00:25:16 -0800 | [diff] [blame] | 610 | static int inet_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 611 | { |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 612 | struct net *net = sock_net(skb->sk); |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 613 | struct fib_config cfg; |
| 614 | struct fib_table *tb; |
| 615 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 616 | |
Denis V. Lunev | 4b5d47d | 2008-01-10 03:29:23 -0800 | [diff] [blame] | 617 | err = rtm_to_fib_config(net, skb, nlh, &cfg); |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 618 | if (err < 0) |
| 619 | goto errout; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 620 | |
Denis V. Lunev | 226b0b4 | 2008-01-10 03:30:24 -0800 | [diff] [blame] | 621 | tb = fib_new_table(net, cfg.fc_table); |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 622 | if (tb == NULL) { |
| 623 | err = -ENOBUFS; |
| 624 | goto errout; |
| 625 | } |
| 626 | |
Stephen Hemminger | 16c6cf8 | 2009-09-20 10:35:36 +0000 | [diff] [blame] | 627 | err = fib_table_insert(tb, &cfg); |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 628 | errout: |
| 629 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 630 | } |
| 631 | |
Thomas Graf | 63f3444 | 2007-03-22 11:55:17 -0700 | [diff] [blame] | 632 | static int inet_dump_fib(struct sk_buff *skb, struct netlink_callback *cb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 633 | { |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 634 | struct net *net = sock_net(skb->sk); |
Patrick McHardy | 1af5a8c | 2006-08-10 23:10:46 -0700 | [diff] [blame] | 635 | unsigned int h, s_h; |
| 636 | unsigned int e = 0, s_e; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 637 | struct fib_table *tb; |
Patrick McHardy | 1af5a8c | 2006-08-10 23:10:46 -0700 | [diff] [blame] | 638 | struct hlist_node *node; |
Denis V. Lunev | e4aef8a | 2008-01-10 03:28:24 -0800 | [diff] [blame] | 639 | struct hlist_head *head; |
Patrick McHardy | 1af5a8c | 2006-08-10 23:10:46 -0700 | [diff] [blame] | 640 | int dumped = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 641 | |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 642 | if (nlmsg_len(cb->nlh) >= sizeof(struct rtmsg) && |
| 643 | ((struct rtmsg *) nlmsg_data(cb->nlh))->rtm_flags & RTM_F_CLONED) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 644 | return ip_rt_dump(skb, cb); |
| 645 | |
Patrick McHardy | 1af5a8c | 2006-08-10 23:10:46 -0700 | [diff] [blame] | 646 | s_h = cb->args[0]; |
| 647 | s_e = cb->args[1]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 648 | |
Patrick McHardy | 1af5a8c | 2006-08-10 23:10:46 -0700 | [diff] [blame] | 649 | for (h = s_h; h < FIB_TABLE_HASHSZ; h++, s_e = 0) { |
| 650 | e = 0; |
Denis V. Lunev | e4aef8a | 2008-01-10 03:28:24 -0800 | [diff] [blame] | 651 | head = &net->ipv4.fib_table_hash[h]; |
| 652 | hlist_for_each_entry(tb, node, head, tb_hlist) { |
Patrick McHardy | 1af5a8c | 2006-08-10 23:10:46 -0700 | [diff] [blame] | 653 | if (e < s_e) |
| 654 | goto next; |
| 655 | if (dumped) |
| 656 | memset(&cb->args[2], 0, sizeof(cb->args) - |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 657 | 2 * sizeof(cb->args[0])); |
Stephen Hemminger | 16c6cf8 | 2009-09-20 10:35:36 +0000 | [diff] [blame] | 658 | if (fib_table_dump(tb, skb, cb) < 0) |
Patrick McHardy | 1af5a8c | 2006-08-10 23:10:46 -0700 | [diff] [blame] | 659 | goto out; |
| 660 | dumped = 1; |
| 661 | next: |
| 662 | e++; |
| 663 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 664 | } |
Patrick McHardy | 1af5a8c | 2006-08-10 23:10:46 -0700 | [diff] [blame] | 665 | out: |
| 666 | cb->args[1] = e; |
| 667 | cb->args[0] = h; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 668 | |
| 669 | return skb->len; |
| 670 | } |
| 671 | |
| 672 | /* Prepare and feed intra-kernel routing request. |
| 673 | Really, it should be netlink message, but :-( netlink |
| 674 | can be not configured, so that we feed it directly |
| 675 | to fib engine. It is legal, because all events occur |
| 676 | only when netlink is already locked. |
| 677 | */ |
| 678 | |
Al Viro | 81f7bf6 | 2006-09-27 18:40:00 -0700 | [diff] [blame] | 679 | static void fib_magic(int cmd, int type, __be32 dst, int dst_len, struct in_ifaddr *ifa) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 680 | { |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 681 | struct net *net = dev_net(ifa->ifa_dev->dev); |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 682 | struct fib_table *tb; |
| 683 | struct fib_config cfg = { |
| 684 | .fc_protocol = RTPROT_KERNEL, |
| 685 | .fc_type = type, |
| 686 | .fc_dst = dst, |
| 687 | .fc_dst_len = dst_len, |
| 688 | .fc_prefsrc = ifa->ifa_local, |
| 689 | .fc_oif = ifa->ifa_dev->dev->ifindex, |
| 690 | .fc_nlflags = NLM_F_CREATE | NLM_F_APPEND, |
Denis V. Lunev | 4d1169c | 2008-01-10 03:26:13 -0800 | [diff] [blame] | 691 | .fc_nlinfo = { |
Denis V. Lunev | 4b5d47d | 2008-01-10 03:29:23 -0800 | [diff] [blame] | 692 | .nl_net = net, |
Denis V. Lunev | 4d1169c | 2008-01-10 03:26:13 -0800 | [diff] [blame] | 693 | }, |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 694 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 695 | |
| 696 | if (type == RTN_UNICAST) |
Denis V. Lunev | 4b5d47d | 2008-01-10 03:29:23 -0800 | [diff] [blame] | 697 | tb = fib_new_table(net, RT_TABLE_MAIN); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 698 | else |
Denis V. Lunev | 4b5d47d | 2008-01-10 03:29:23 -0800 | [diff] [blame] | 699 | tb = fib_new_table(net, RT_TABLE_LOCAL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 700 | |
| 701 | if (tb == NULL) |
| 702 | return; |
| 703 | |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 704 | cfg.fc_table = tb->tb_id; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 705 | |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 706 | if (type != RTN_LOCAL) |
| 707 | cfg.fc_scope = RT_SCOPE_LINK; |
| 708 | else |
| 709 | cfg.fc_scope = RT_SCOPE_HOST; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 710 | |
| 711 | if (cmd == RTM_NEWROUTE) |
Stephen Hemminger | 16c6cf8 | 2009-09-20 10:35:36 +0000 | [diff] [blame] | 712 | fib_table_insert(tb, &cfg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 713 | else |
Stephen Hemminger | 16c6cf8 | 2009-09-20 10:35:36 +0000 | [diff] [blame] | 714 | fib_table_delete(tb, &cfg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 715 | } |
| 716 | |
Jamal Hadi Salim | 0ff60a4 | 2005-11-22 14:47:37 -0800 | [diff] [blame] | 717 | void fib_add_ifaddr(struct in_ifaddr *ifa) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 718 | { |
| 719 | struct in_device *in_dev = ifa->ifa_dev; |
| 720 | struct net_device *dev = in_dev->dev; |
| 721 | struct in_ifaddr *prim = ifa; |
Al Viro | a144ea4 | 2006-09-28 18:00:55 -0700 | [diff] [blame] | 722 | __be32 mask = ifa->ifa_mask; |
| 723 | __be32 addr = ifa->ifa_local; |
| 724 | __be32 prefix = ifa->ifa_address&mask; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 725 | |
| 726 | if (ifa->ifa_flags&IFA_F_SECONDARY) { |
| 727 | prim = inet_ifa_byprefix(in_dev, prefix, mask); |
| 728 | if (prim == NULL) { |
Stephen Hemminger | a6db901 | 2008-01-12 20:58:35 -0800 | [diff] [blame] | 729 | printk(KERN_WARNING "fib_add_ifaddr: bug: prim == NULL\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 730 | return; |
| 731 | } |
| 732 | } |
| 733 | |
| 734 | fib_magic(RTM_NEWROUTE, RTN_LOCAL, addr, 32, prim); |
| 735 | |
| 736 | if (!(dev->flags&IFF_UP)) |
| 737 | return; |
| 738 | |
| 739 | /* Add broadcast address, if it is explicitly assigned. */ |
Al Viro | a144ea4 | 2006-09-28 18:00:55 -0700 | [diff] [blame] | 740 | if (ifa->ifa_broadcast && ifa->ifa_broadcast != htonl(0xFFFFFFFF)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 741 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim); |
| 742 | |
Joe Perches | f97c1e0 | 2007-12-16 13:45:43 -0800 | [diff] [blame] | 743 | if (!ipv4_is_zeronet(prefix) && !(ifa->ifa_flags&IFA_F_SECONDARY) && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 744 | (prefix != addr || ifa->ifa_prefixlen < 32)) { |
| 745 | fib_magic(RTM_NEWROUTE, dev->flags&IFF_LOOPBACK ? RTN_LOCAL : |
| 746 | RTN_UNICAST, prefix, ifa->ifa_prefixlen, prim); |
| 747 | |
| 748 | /* Add network specific broadcasts, when it takes a sense */ |
| 749 | if (ifa->ifa_prefixlen < 31) { |
| 750 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix, 32, prim); |
| 751 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix|~mask, 32, prim); |
| 752 | } |
| 753 | } |
| 754 | } |
| 755 | |
| 756 | static void fib_del_ifaddr(struct in_ifaddr *ifa) |
| 757 | { |
| 758 | struct in_device *in_dev = ifa->ifa_dev; |
| 759 | struct net_device *dev = in_dev->dev; |
| 760 | struct in_ifaddr *ifa1; |
| 761 | struct in_ifaddr *prim = ifa; |
Al Viro | a144ea4 | 2006-09-28 18:00:55 -0700 | [diff] [blame] | 762 | __be32 brd = ifa->ifa_address|~ifa->ifa_mask; |
| 763 | __be32 any = ifa->ifa_address&ifa->ifa_mask; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 764 | #define LOCAL_OK 1 |
| 765 | #define BRD_OK 2 |
| 766 | #define BRD0_OK 4 |
| 767 | #define BRD1_OK 8 |
| 768 | unsigned ok = 0; |
| 769 | |
| 770 | if (!(ifa->ifa_flags&IFA_F_SECONDARY)) |
| 771 | fib_magic(RTM_DELROUTE, dev->flags&IFF_LOOPBACK ? RTN_LOCAL : |
| 772 | RTN_UNICAST, any, ifa->ifa_prefixlen, prim); |
| 773 | else { |
| 774 | prim = inet_ifa_byprefix(in_dev, any, ifa->ifa_mask); |
| 775 | if (prim == NULL) { |
Stephen Hemminger | a6db901 | 2008-01-12 20:58:35 -0800 | [diff] [blame] | 776 | printk(KERN_WARNING "fib_del_ifaddr: bug: prim == NULL\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 777 | return; |
| 778 | } |
| 779 | } |
| 780 | |
| 781 | /* Deletion is more complicated than add. |
| 782 | We should take care of not to delete too much :-) |
| 783 | |
| 784 | Scan address list to be sure that addresses are really gone. |
| 785 | */ |
| 786 | |
| 787 | for (ifa1 = in_dev->ifa_list; ifa1; ifa1 = ifa1->ifa_next) { |
| 788 | if (ifa->ifa_local == ifa1->ifa_local) |
| 789 | ok |= LOCAL_OK; |
| 790 | if (ifa->ifa_broadcast == ifa1->ifa_broadcast) |
| 791 | ok |= BRD_OK; |
| 792 | if (brd == ifa1->ifa_broadcast) |
| 793 | ok |= BRD1_OK; |
| 794 | if (any == ifa1->ifa_broadcast) |
| 795 | ok |= BRD0_OK; |
| 796 | } |
| 797 | |
| 798 | if (!(ok&BRD_OK)) |
| 799 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim); |
| 800 | if (!(ok&BRD1_OK)) |
| 801 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, brd, 32, prim); |
| 802 | if (!(ok&BRD0_OK)) |
| 803 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, any, 32, prim); |
| 804 | if (!(ok&LOCAL_OK)) { |
| 805 | fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 32, prim); |
| 806 | |
| 807 | /* Check, that this local address finally disappeared. */ |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 808 | if (inet_addr_type(dev_net(dev), ifa->ifa_local) != RTN_LOCAL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 809 | /* And the last, but not the least thing. |
| 810 | We must flush stray FIB entries. |
| 811 | |
| 812 | First of all, we scan fib_info list searching |
| 813 | for stray nexthop entries, then ignite fib_flush. |
| 814 | */ |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 815 | if (fib_sync_down_addr(dev_net(dev), ifa->ifa_local)) |
| 816 | fib_flush(dev_net(dev)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 817 | } |
| 818 | } |
| 819 | #undef LOCAL_OK |
| 820 | #undef BRD_OK |
| 821 | #undef BRD0_OK |
| 822 | #undef BRD1_OK |
| 823 | } |
| 824 | |
Robert Olsson | 246955f | 2005-06-20 13:36:39 -0700 | [diff] [blame] | 825 | static void nl_fib_lookup(struct fib_result_nl *frn, struct fib_table *tb ) |
| 826 | { |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 827 | |
Robert Olsson | 246955f | 2005-06-20 13:36:39 -0700 | [diff] [blame] | 828 | struct fib_result res; |
Thomas Graf | 5f30089 | 2006-11-09 15:21:41 -0800 | [diff] [blame] | 829 | struct flowi fl = { .mark = frn->fl_mark, |
Thomas Graf | 47dcf0c | 2006-11-09 15:20:38 -0800 | [diff] [blame] | 830 | .nl_u = { .ip4_u = { .daddr = frn->fl_addr, |
Robert Olsson | 246955f | 2005-06-20 13:36:39 -0700 | [diff] [blame] | 831 | .tos = frn->fl_tos, |
| 832 | .scope = frn->fl_scope } } }; |
Alexey Kuznetsov | 1194ed0 | 2007-04-25 13:07:28 -0700 | [diff] [blame] | 833 | |
Sergey Vlasov | 912a41a | 2007-04-27 02:17:19 -0700 | [diff] [blame] | 834 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
| 835 | res.r = NULL; |
| 836 | #endif |
| 837 | |
Alexey Kuznetsov | 1194ed0 | 2007-04-25 13:07:28 -0700 | [diff] [blame] | 838 | frn->err = -ENOENT; |
Robert Olsson | 246955f | 2005-06-20 13:36:39 -0700 | [diff] [blame] | 839 | if (tb) { |
| 840 | local_bh_disable(); |
| 841 | |
| 842 | frn->tb_id = tb->tb_id; |
Stephen Hemminger | 16c6cf8 | 2009-09-20 10:35:36 +0000 | [diff] [blame] | 843 | frn->err = fib_table_lookup(tb, &fl, &res); |
Robert Olsson | 246955f | 2005-06-20 13:36:39 -0700 | [diff] [blame] | 844 | |
| 845 | if (!frn->err) { |
| 846 | frn->prefixlen = res.prefixlen; |
| 847 | frn->nh_sel = res.nh_sel; |
| 848 | frn->type = res.type; |
| 849 | frn->scope = res.scope; |
Alexey Kuznetsov | 1194ed0 | 2007-04-25 13:07:28 -0700 | [diff] [blame] | 850 | fib_res_put(&res); |
Robert Olsson | 246955f | 2005-06-20 13:36:39 -0700 | [diff] [blame] | 851 | } |
| 852 | local_bh_enable(); |
| 853 | } |
| 854 | } |
| 855 | |
David S. Miller | 28f7b03 | 2007-10-10 21:32:39 -0700 | [diff] [blame] | 856 | static void nl_fib_input(struct sk_buff *skb) |
Robert Olsson | 246955f | 2005-06-20 13:36:39 -0700 | [diff] [blame] | 857 | { |
Denis V. Lunev | 6bd48fc | 2008-01-10 03:28:55 -0800 | [diff] [blame] | 858 | struct net *net; |
Robert Olsson | 246955f | 2005-06-20 13:36:39 -0700 | [diff] [blame] | 859 | struct fib_result_nl *frn; |
David S. Miller | 28f7b03 | 2007-10-10 21:32:39 -0700 | [diff] [blame] | 860 | struct nlmsghdr *nlh; |
Robert Olsson | 246955f | 2005-06-20 13:36:39 -0700 | [diff] [blame] | 861 | struct fib_table *tb; |
David S. Miller | 28f7b03 | 2007-10-10 21:32:39 -0700 | [diff] [blame] | 862 | u32 pid; |
Alexey Kuznetsov | 1194ed0 | 2007-04-25 13:07:28 -0700 | [diff] [blame] | 863 | |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 864 | net = sock_net(skb->sk); |
Arnaldo Carvalho de Melo | b529ccf | 2007-04-25 19:08:35 -0700 | [diff] [blame] | 865 | nlh = nlmsg_hdr(skb); |
Thomas Graf | ea86575 | 2005-12-01 14:30:00 -0800 | [diff] [blame] | 866 | if (skb->len < NLMSG_SPACE(0) || skb->len < nlh->nlmsg_len || |
Denis V. Lunev | d883a03 | 2007-12-21 02:01:53 -0800 | [diff] [blame] | 867 | nlh->nlmsg_len < NLMSG_LENGTH(sizeof(*frn))) |
Thomas Graf | ea86575 | 2005-12-01 14:30:00 -0800 | [diff] [blame] | 868 | return; |
Denis V. Lunev | d883a03 | 2007-12-21 02:01:53 -0800 | [diff] [blame] | 869 | |
| 870 | skb = skb_clone(skb, GFP_KERNEL); |
| 871 | if (skb == NULL) |
| 872 | return; |
| 873 | nlh = nlmsg_hdr(skb); |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 874 | |
Robert Olsson | 246955f | 2005-06-20 13:36:39 -0700 | [diff] [blame] | 875 | frn = (struct fib_result_nl *) NLMSG_DATA(nlh); |
Denis V. Lunev | 6bd48fc | 2008-01-10 03:28:55 -0800 | [diff] [blame] | 876 | tb = fib_get_table(net, frn->tb_id_in); |
Robert Olsson | 246955f | 2005-06-20 13:36:39 -0700 | [diff] [blame] | 877 | |
| 878 | nl_fib_lookup(frn, tb); |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 879 | |
Alexey Kuznetsov | 1194ed0 | 2007-04-25 13:07:28 -0700 | [diff] [blame] | 880 | pid = NETLINK_CB(skb).pid; /* pid of sending process */ |
Robert Olsson | 246955f | 2005-06-20 13:36:39 -0700 | [diff] [blame] | 881 | NETLINK_CB(skb).pid = 0; /* from kernel */ |
Patrick McHardy | ac6d439 | 2005-08-14 19:29:52 -0700 | [diff] [blame] | 882 | NETLINK_CB(skb).dst_group = 0; /* unicast */ |
Denis V. Lunev | 6bd48fc | 2008-01-10 03:28:55 -0800 | [diff] [blame] | 883 | netlink_unicast(net->ipv4.fibnl, skb, pid, MSG_DONTWAIT); |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 884 | } |
Robert Olsson | 246955f | 2005-06-20 13:36:39 -0700 | [diff] [blame] | 885 | |
Alexey Dobriyan | 2c8c1e7 | 2010-01-17 03:35:32 +0000 | [diff] [blame^] | 886 | static int __net_init nl_fib_lookup_init(struct net *net) |
Robert Olsson | 246955f | 2005-06-20 13:36:39 -0700 | [diff] [blame] | 887 | { |
Denis V. Lunev | 6bd48fc | 2008-01-10 03:28:55 -0800 | [diff] [blame] | 888 | struct sock *sk; |
| 889 | sk = netlink_kernel_create(net, NETLINK_FIB_LOOKUP, 0, |
| 890 | nl_fib_input, NULL, THIS_MODULE); |
| 891 | if (sk == NULL) |
Denis V. Lunev | 7b1a74f | 2008-01-10 03:22:17 -0800 | [diff] [blame] | 892 | return -EAFNOSUPPORT; |
Denis V. Lunev | 6bd48fc | 2008-01-10 03:28:55 -0800 | [diff] [blame] | 893 | net->ipv4.fibnl = sk; |
Denis V. Lunev | 7b1a74f | 2008-01-10 03:22:17 -0800 | [diff] [blame] | 894 | return 0; |
| 895 | } |
| 896 | |
| 897 | static void nl_fib_lookup_exit(struct net *net) |
| 898 | { |
Denis V. Lunev | b7c6ba6 | 2008-01-28 14:41:19 -0800 | [diff] [blame] | 899 | netlink_kernel_release(net->ipv4.fibnl); |
Denis V. Lunev | 775516b | 2008-01-18 23:55:19 -0800 | [diff] [blame] | 900 | net->ipv4.fibnl = NULL; |
Robert Olsson | 246955f | 2005-06-20 13:36:39 -0700 | [diff] [blame] | 901 | } |
| 902 | |
Octavian Purdila | e2ce146 | 2009-11-16 13:49:49 +0000 | [diff] [blame] | 903 | static void fib_disable_ip(struct net_device *dev, int force, int delay) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 904 | { |
Denis V. Lunev | 85326fa | 2008-01-31 18:48:47 -0800 | [diff] [blame] | 905 | if (fib_sync_down_dev(dev, force)) |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 906 | fib_flush(dev_net(dev)); |
Octavian Purdila | e2ce146 | 2009-11-16 13:49:49 +0000 | [diff] [blame] | 907 | rt_cache_flush(dev_net(dev), delay); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 908 | arp_ifdown(dev); |
| 909 | } |
| 910 | |
| 911 | static int fib_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr) |
| 912 | { |
Jianjun Kong | 6ed2533 | 2008-11-03 00:25:16 -0800 | [diff] [blame] | 913 | struct in_ifaddr *ifa = (struct in_ifaddr *)ptr; |
Denis V. Lunev | 76e6ebf | 2008-07-05 19:00:44 -0700 | [diff] [blame] | 914 | struct net_device *dev = ifa->ifa_dev->dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 915 | |
| 916 | switch (event) { |
| 917 | case NETDEV_UP: |
| 918 | fib_add_ifaddr(ifa); |
| 919 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
Denis V. Lunev | 76e6ebf | 2008-07-05 19:00:44 -0700 | [diff] [blame] | 920 | fib_sync_up(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 921 | #endif |
Denis V. Lunev | 76e6ebf | 2008-07-05 19:00:44 -0700 | [diff] [blame] | 922 | rt_cache_flush(dev_net(dev), -1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 923 | break; |
| 924 | case NETDEV_DOWN: |
| 925 | fib_del_ifaddr(ifa); |
Jayachandran C | 9fcc2e8 | 2005-10-27 15:10:01 -0700 | [diff] [blame] | 926 | if (ifa->ifa_dev->ifa_list == NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 927 | /* Last address was deleted from this interface. |
| 928 | Disable IP. |
| 929 | */ |
Octavian Purdila | e2ce146 | 2009-11-16 13:49:49 +0000 | [diff] [blame] | 930 | fib_disable_ip(dev, 1, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 931 | } else { |
Denis V. Lunev | 76e6ebf | 2008-07-05 19:00:44 -0700 | [diff] [blame] | 932 | rt_cache_flush(dev_net(dev), -1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 933 | } |
| 934 | break; |
| 935 | } |
| 936 | return NOTIFY_DONE; |
| 937 | } |
| 938 | |
| 939 | static int fib_netdev_event(struct notifier_block *this, unsigned long event, void *ptr) |
| 940 | { |
| 941 | struct net_device *dev = ptr; |
Herbert Xu | e5ed639 | 2005-10-03 14:35:55 -0700 | [diff] [blame] | 942 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 943 | |
| 944 | if (event == NETDEV_UNREGISTER) { |
Octavian Purdila | e2ce146 | 2009-11-16 13:49:49 +0000 | [diff] [blame] | 945 | fib_disable_ip(dev, 2, -1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 946 | return NOTIFY_DONE; |
| 947 | } |
| 948 | |
| 949 | if (!in_dev) |
| 950 | return NOTIFY_DONE; |
| 951 | |
| 952 | switch (event) { |
| 953 | case NETDEV_UP: |
| 954 | for_ifa(in_dev) { |
| 955 | fib_add_ifaddr(ifa); |
| 956 | } endfor_ifa(in_dev); |
| 957 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
| 958 | fib_sync_up(dev); |
| 959 | #endif |
Denis V. Lunev | 76e6ebf | 2008-07-05 19:00:44 -0700 | [diff] [blame] | 960 | rt_cache_flush(dev_net(dev), -1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 961 | break; |
| 962 | case NETDEV_DOWN: |
Octavian Purdila | e2ce146 | 2009-11-16 13:49:49 +0000 | [diff] [blame] | 963 | fib_disable_ip(dev, 0, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 964 | break; |
| 965 | case NETDEV_CHANGEMTU: |
| 966 | case NETDEV_CHANGE: |
Denis V. Lunev | 76e6ebf | 2008-07-05 19:00:44 -0700 | [diff] [blame] | 967 | rt_cache_flush(dev_net(dev), 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 968 | break; |
Eric W. Biederman | a5ee155 | 2009-11-29 15:45:58 +0000 | [diff] [blame] | 969 | case NETDEV_UNREGISTER_BATCH: |
| 970 | rt_cache_flush_batch(); |
| 971 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 972 | } |
| 973 | return NOTIFY_DONE; |
| 974 | } |
| 975 | |
| 976 | static struct notifier_block fib_inetaddr_notifier = { |
Jianjun Kong | 6ed2533 | 2008-11-03 00:25:16 -0800 | [diff] [blame] | 977 | .notifier_call = fib_inetaddr_event, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 978 | }; |
| 979 | |
| 980 | static struct notifier_block fib_netdev_notifier = { |
Jianjun Kong | 6ed2533 | 2008-11-03 00:25:16 -0800 | [diff] [blame] | 981 | .notifier_call = fib_netdev_event, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 982 | }; |
| 983 | |
Denis V. Lunev | 7b1a74f | 2008-01-10 03:22:17 -0800 | [diff] [blame] | 984 | static int __net_init ip_fib_net_init(struct net *net) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 985 | { |
Denis V. Lunev | dce5cbe | 2008-01-31 18:44:53 -0800 | [diff] [blame] | 986 | int err; |
Patrick McHardy | 1af5a8c | 2006-08-10 23:10:46 -0700 | [diff] [blame] | 987 | unsigned int i; |
| 988 | |
Denis V. Lunev | e4aef8a | 2008-01-10 03:28:24 -0800 | [diff] [blame] | 989 | net->ipv4.fib_table_hash = kzalloc( |
| 990 | sizeof(struct hlist_head)*FIB_TABLE_HASHSZ, GFP_KERNEL); |
| 991 | if (net->ipv4.fib_table_hash == NULL) |
| 992 | return -ENOMEM; |
| 993 | |
Patrick McHardy | 1af5a8c | 2006-08-10 23:10:46 -0700 | [diff] [blame] | 994 | for (i = 0; i < FIB_TABLE_HASHSZ; i++) |
Denis V. Lunev | e4aef8a | 2008-01-10 03:28:24 -0800 | [diff] [blame] | 995 | INIT_HLIST_HEAD(&net->ipv4.fib_table_hash[i]); |
Pavel Emelyanov | c3e9a35 | 2007-11-06 23:34:04 -0800 | [diff] [blame] | 996 | |
Denis V. Lunev | dce5cbe | 2008-01-31 18:44:53 -0800 | [diff] [blame] | 997 | err = fib4_rules_init(net); |
| 998 | if (err < 0) |
| 999 | goto fail; |
| 1000 | return 0; |
| 1001 | |
| 1002 | fail: |
| 1003 | kfree(net->ipv4.fib_table_hash); |
| 1004 | return err; |
Denis V. Lunev | 7b1a74f | 2008-01-10 03:22:17 -0800 | [diff] [blame] | 1005 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1006 | |
Alexey Dobriyan | 2c8c1e7 | 2010-01-17 03:35:32 +0000 | [diff] [blame^] | 1007 | static void ip_fib_net_exit(struct net *net) |
Denis V. Lunev | 7b1a74f | 2008-01-10 03:22:17 -0800 | [diff] [blame] | 1008 | { |
| 1009 | unsigned int i; |
Thomas Graf | 63f3444 | 2007-03-22 11:55:17 -0700 | [diff] [blame] | 1010 | |
Denis V. Lunev | 7b1a74f | 2008-01-10 03:22:17 -0800 | [diff] [blame] | 1011 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
| 1012 | fib4_rules_exit(net); |
| 1013 | #endif |
| 1014 | |
| 1015 | for (i = 0; i < FIB_TABLE_HASHSZ; i++) { |
| 1016 | struct fib_table *tb; |
| 1017 | struct hlist_head *head; |
| 1018 | struct hlist_node *node, *tmp; |
| 1019 | |
Denis V. Lunev | e4aef8a | 2008-01-10 03:28:24 -0800 | [diff] [blame] | 1020 | head = &net->ipv4.fib_table_hash[i]; |
Denis V. Lunev | 7b1a74f | 2008-01-10 03:22:17 -0800 | [diff] [blame] | 1021 | hlist_for_each_entry_safe(tb, node, tmp, head, tb_hlist) { |
| 1022 | hlist_del(node); |
Stephen Hemminger | 16c6cf8 | 2009-09-20 10:35:36 +0000 | [diff] [blame] | 1023 | fib_table_flush(tb); |
Denis V. Lunev | 7b1a74f | 2008-01-10 03:22:17 -0800 | [diff] [blame] | 1024 | kfree(tb); |
| 1025 | } |
| 1026 | } |
Denis V. Lunev | e4aef8a | 2008-01-10 03:28:24 -0800 | [diff] [blame] | 1027 | kfree(net->ipv4.fib_table_hash); |
Denis V. Lunev | 7b1a74f | 2008-01-10 03:22:17 -0800 | [diff] [blame] | 1028 | } |
| 1029 | |
| 1030 | static int __net_init fib_net_init(struct net *net) |
| 1031 | { |
| 1032 | int error; |
| 1033 | |
Denis V. Lunev | 7b1a74f | 2008-01-10 03:22:17 -0800 | [diff] [blame] | 1034 | error = ip_fib_net_init(net); |
| 1035 | if (error < 0) |
| 1036 | goto out; |
| 1037 | error = nl_fib_lookup_init(net); |
| 1038 | if (error < 0) |
| 1039 | goto out_nlfl; |
| 1040 | error = fib_proc_init(net); |
| 1041 | if (error < 0) |
| 1042 | goto out_proc; |
| 1043 | out: |
| 1044 | return error; |
| 1045 | |
| 1046 | out_proc: |
| 1047 | nl_fib_lookup_exit(net); |
| 1048 | out_nlfl: |
| 1049 | ip_fib_net_exit(net); |
| 1050 | goto out; |
| 1051 | } |
| 1052 | |
| 1053 | static void __net_exit fib_net_exit(struct net *net) |
| 1054 | { |
| 1055 | fib_proc_exit(net); |
| 1056 | nl_fib_lookup_exit(net); |
| 1057 | ip_fib_net_exit(net); |
| 1058 | } |
| 1059 | |
| 1060 | static struct pernet_operations fib_net_ops = { |
| 1061 | .init = fib_net_init, |
| 1062 | .exit = fib_net_exit, |
| 1063 | }; |
| 1064 | |
| 1065 | void __init ip_fib_init(void) |
| 1066 | { |
Thomas Graf | 63f3444 | 2007-03-22 11:55:17 -0700 | [diff] [blame] | 1067 | rtnl_register(PF_INET, RTM_NEWROUTE, inet_rtm_newroute, NULL); |
| 1068 | rtnl_register(PF_INET, RTM_DELROUTE, inet_rtm_delroute, NULL); |
| 1069 | rtnl_register(PF_INET, RTM_GETROUTE, NULL, inet_dump_fib); |
Denis V. Lunev | 7b1a74f | 2008-01-10 03:22:17 -0800 | [diff] [blame] | 1070 | |
| 1071 | register_pernet_subsys(&fib_net_ops); |
| 1072 | register_netdevice_notifier(&fib_netdev_notifier); |
| 1073 | register_inetaddr_notifier(&fib_inetaddr_notifier); |
Stephen Hemminger | 7f9b805 | 2008-01-14 23:14:20 -0800 | [diff] [blame] | 1074 | |
| 1075 | fib_hash_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1076 | } |
| 1077 | |
| 1078 | EXPORT_SYMBOL(inet_addr_type); |
Laszlo Attila Toth | 0553811 | 2007-12-04 23:28:46 -0800 | [diff] [blame] | 1079 | EXPORT_SYMBOL(inet_dev_addr_type); |
Sean Hefty | a1e8733 | 2006-06-17 20:37:28 -0700 | [diff] [blame] | 1080 | EXPORT_SYMBOL(ip_dev_find); |