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 | * |
| 8 | * Version: $Id: fib_frontend.c,v 1.26 2001/10/31 21:55:54 davem Exp $ |
| 9 | * |
| 10 | * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> |
| 11 | * |
| 12 | * This program is free software; you can redistribute it and/or |
| 13 | * modify it under the terms of the GNU General Public License |
| 14 | * as published by the Free Software Foundation; either version |
| 15 | * 2 of the License, or (at your option) any later version. |
| 16 | */ |
| 17 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | #include <linux/module.h> |
| 19 | #include <asm/uaccess.h> |
| 20 | #include <asm/system.h> |
| 21 | #include <linux/bitops.h> |
Randy Dunlap | 4fc268d | 2006-01-11 12:17:47 -0800 | [diff] [blame] | 22 | #include <linux/capability.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | #include <linux/types.h> |
| 24 | #include <linux/kernel.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | #include <linux/mm.h> |
| 26 | #include <linux/string.h> |
| 27 | #include <linux/socket.h> |
| 28 | #include <linux/sockios.h> |
| 29 | #include <linux/errno.h> |
| 30 | #include <linux/in.h> |
| 31 | #include <linux/inet.h> |
Arnaldo Carvalho de Melo | 14c8502 | 2005-12-27 02:43:12 -0200 | [diff] [blame] | 32 | #include <linux/inetdevice.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | #include <linux/netdevice.h> |
Thomas Graf | 1823730 | 2006-08-04 23:04:54 -0700 | [diff] [blame] | 34 | #include <linux/if_addr.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | #include <linux/if_arp.h> |
| 36 | #include <linux/skbuff.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | #include <linux/init.h> |
Patrick McHardy | 1af5a8c | 2006-08-10 23:10:46 -0700 | [diff] [blame] | 38 | #include <linux/list.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | |
| 40 | #include <net/ip.h> |
| 41 | #include <net/protocol.h> |
| 42 | #include <net/route.h> |
| 43 | #include <net/tcp.h> |
| 44 | #include <net/sock.h> |
| 45 | #include <net/icmp.h> |
| 46 | #include <net/arp.h> |
| 47 | #include <net/ip_fib.h> |
Thomas Graf | 63f3444 | 2007-03-22 11:55:17 -0700 | [diff] [blame] | 48 | #include <net/rtnetlink.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | |
| 50 | #define FFprint(a...) printk(KERN_DEBUG a) |
| 51 | |
David S. Miller | 28f7b036 | 2007-10-10 21:32:39 -0700 | [diff] [blame] | 52 | static struct sock *fibnl; |
| 53 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | #ifndef CONFIG_IP_MULTIPLE_TABLES |
| 55 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | struct fib_table *ip_fib_local_table; |
| 57 | struct fib_table *ip_fib_main_table; |
| 58 | |
Patrick McHardy | 1af5a8c | 2006-08-10 23:10:46 -0700 | [diff] [blame] | 59 | #define FIB_TABLE_HASHSZ 1 |
| 60 | static struct hlist_head fib_table_hash[FIB_TABLE_HASHSZ]; |
| 61 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | #else |
| 63 | |
Patrick McHardy | 1af5a8c | 2006-08-10 23:10:46 -0700 | [diff] [blame] | 64 | #define FIB_TABLE_HASHSZ 256 |
| 65 | static struct hlist_head fib_table_hash[FIB_TABLE_HASHSZ]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | |
Patrick McHardy | 1af5a8c | 2006-08-10 23:10:46 -0700 | [diff] [blame] | 67 | struct fib_table *fib_new_table(u32 id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | { |
| 69 | struct fib_table *tb; |
Patrick McHardy | 1af5a8c | 2006-08-10 23:10:46 -0700 | [diff] [blame] | 70 | unsigned int h; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | |
Patrick McHardy | 1af5a8c | 2006-08-10 23:10:46 -0700 | [diff] [blame] | 72 | if (id == 0) |
| 73 | id = RT_TABLE_MAIN; |
| 74 | tb = fib_get_table(id); |
| 75 | if (tb) |
| 76 | return tb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | tb = fib_hash_init(id); |
| 78 | if (!tb) |
| 79 | return NULL; |
Patrick McHardy | 1af5a8c | 2006-08-10 23:10:46 -0700 | [diff] [blame] | 80 | h = id & (FIB_TABLE_HASHSZ - 1); |
| 81 | hlist_add_head_rcu(&tb->tb_hlist, &fib_table_hash[h]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | return tb; |
| 83 | } |
| 84 | |
Patrick McHardy | 1af5a8c | 2006-08-10 23:10:46 -0700 | [diff] [blame] | 85 | struct fib_table *fib_get_table(u32 id) |
| 86 | { |
| 87 | struct fib_table *tb; |
| 88 | struct hlist_node *node; |
| 89 | unsigned int h; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 90 | |
Patrick McHardy | 1af5a8c | 2006-08-10 23:10:46 -0700 | [diff] [blame] | 91 | if (id == 0) |
| 92 | id = RT_TABLE_MAIN; |
| 93 | h = id & (FIB_TABLE_HASHSZ - 1); |
| 94 | rcu_read_lock(); |
| 95 | hlist_for_each_entry_rcu(tb, node, &fib_table_hash[h], tb_hlist) { |
| 96 | if (tb->tb_id == id) { |
| 97 | rcu_read_unlock(); |
| 98 | return tb; |
| 99 | } |
| 100 | } |
| 101 | rcu_read_unlock(); |
| 102 | return NULL; |
| 103 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | #endif /* CONFIG_IP_MULTIPLE_TABLES */ |
| 105 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | static void fib_flush(void) |
| 107 | { |
| 108 | int flushed = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | struct fib_table *tb; |
Patrick McHardy | 1af5a8c | 2006-08-10 23:10:46 -0700 | [diff] [blame] | 110 | struct hlist_node *node; |
| 111 | unsigned int h; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | |
Patrick McHardy | 1af5a8c | 2006-08-10 23:10:46 -0700 | [diff] [blame] | 113 | for (h = 0; h < FIB_TABLE_HASHSZ; h++) { |
| 114 | hlist_for_each_entry(tb, node, &fib_table_hash[h], tb_hlist) |
| 115 | flushed += tb->tb_flush(tb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 117 | |
| 118 | if (flushed) |
| 119 | rt_cache_flush(-1); |
| 120 | } |
| 121 | |
| 122 | /* |
| 123 | * Find the first device with a given source address. |
| 124 | */ |
| 125 | |
Al Viro | 60cad5d | 2006-09-26 22:17:09 -0700 | [diff] [blame] | 126 | struct net_device * ip_dev_find(__be32 addr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | { |
| 128 | struct flowi fl = { .nl_u = { .ip4_u = { .daddr = addr } } }; |
| 129 | struct fib_result res; |
| 130 | struct net_device *dev = NULL; |
Pavel Emelyanov | 03cf786 | 2007-10-23 21:17:27 -0700 | [diff] [blame] | 131 | struct fib_table *local_table; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 132 | |
| 133 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
| 134 | res.r = NULL; |
| 135 | #endif |
| 136 | |
Pavel Emelyanov | 03cf786 | 2007-10-23 21:17:27 -0700 | [diff] [blame] | 137 | local_table = fib_get_table(RT_TABLE_LOCAL); |
| 138 | if (!local_table || local_table->tb_lookup(local_table, &fl, &res)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | return NULL; |
| 140 | if (res.type != RTN_LOCAL) |
| 141 | goto out; |
| 142 | dev = FIB_RES_DEV(res); |
| 143 | |
| 144 | if (dev) |
| 145 | dev_hold(dev); |
| 146 | out: |
| 147 | fib_res_put(&res); |
| 148 | return dev; |
| 149 | } |
| 150 | |
Al Viro | fd68322 | 2006-09-26 22:17:51 -0700 | [diff] [blame] | 151 | unsigned inet_addr_type(__be32 addr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | { |
| 153 | struct flowi fl = { .nl_u = { .ip4_u = { .daddr = addr } } }; |
| 154 | struct fib_result res; |
| 155 | unsigned ret = RTN_BROADCAST; |
Pavel Emelyanov | 03cf786 | 2007-10-23 21:17:27 -0700 | [diff] [blame] | 156 | struct fib_table *local_table; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 157 | |
| 158 | if (ZERONET(addr) || BADCLASS(addr)) |
| 159 | return RTN_BROADCAST; |
| 160 | if (MULTICAST(addr)) |
| 161 | return RTN_MULTICAST; |
| 162 | |
| 163 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
| 164 | res.r = NULL; |
| 165 | #endif |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 166 | |
Pavel Emelyanov | 03cf786 | 2007-10-23 21:17:27 -0700 | [diff] [blame] | 167 | local_table = fib_get_table(RT_TABLE_LOCAL); |
| 168 | if (local_table) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 169 | ret = RTN_UNICAST; |
Pavel Emelyanov | 03cf786 | 2007-10-23 21:17:27 -0700 | [diff] [blame] | 170 | if (!local_table->tb_lookup(local_table, &fl, &res)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 171 | ret = res.type; |
| 172 | fib_res_put(&res); |
| 173 | } |
| 174 | } |
| 175 | return ret; |
| 176 | } |
| 177 | |
| 178 | /* Given (packet source, input interface) and optional (dst, oif, tos): |
| 179 | - (main) check, that source is valid i.e. not broadcast or our local |
| 180 | address. |
| 181 | - figure out what "logical" interface this packet arrived |
| 182 | and calculate "specific destination" address. |
| 183 | - check, that packet arrived from expected physical interface. |
| 184 | */ |
| 185 | |
Al Viro | d9c9df8 | 2006-09-26 21:28:14 -0700 | [diff] [blame] | 186 | int fib_validate_source(__be32 src, __be32 dst, u8 tos, int oif, |
| 187 | struct net_device *dev, __be32 *spec_dst, u32 *itag) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 188 | { |
| 189 | struct in_device *in_dev; |
| 190 | struct flowi fl = { .nl_u = { .ip4_u = |
| 191 | { .daddr = src, |
| 192 | .saddr = dst, |
| 193 | .tos = tos } }, |
| 194 | .iif = oif }; |
| 195 | struct fib_result res; |
| 196 | int no_addr, rpf; |
| 197 | int ret; |
| 198 | |
| 199 | no_addr = rpf = 0; |
| 200 | rcu_read_lock(); |
Herbert Xu | e5ed639 | 2005-10-03 14:35:55 -0700 | [diff] [blame] | 201 | in_dev = __in_dev_get_rcu(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 202 | if (in_dev) { |
| 203 | no_addr = in_dev->ifa_list == NULL; |
| 204 | rpf = IN_DEV_RPFILTER(in_dev); |
| 205 | } |
| 206 | rcu_read_unlock(); |
| 207 | |
| 208 | if (in_dev == NULL) |
| 209 | goto e_inval; |
| 210 | |
| 211 | if (fib_lookup(&fl, &res)) |
| 212 | goto last_resort; |
| 213 | if (res.type != RTN_UNICAST) |
| 214 | goto e_inval_res; |
| 215 | *spec_dst = FIB_RES_PREFSRC(res); |
| 216 | fib_combine_itag(itag, &res); |
| 217 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
| 218 | if (FIB_RES_DEV(res) == dev || res.fi->fib_nhs > 1) |
| 219 | #else |
| 220 | if (FIB_RES_DEV(res) == dev) |
| 221 | #endif |
| 222 | { |
| 223 | ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST; |
| 224 | fib_res_put(&res); |
| 225 | return ret; |
| 226 | } |
| 227 | fib_res_put(&res); |
| 228 | if (no_addr) |
| 229 | goto last_resort; |
| 230 | if (rpf) |
| 231 | goto e_inval; |
| 232 | fl.oif = dev->ifindex; |
| 233 | |
| 234 | ret = 0; |
| 235 | if (fib_lookup(&fl, &res) == 0) { |
| 236 | if (res.type == RTN_UNICAST) { |
| 237 | *spec_dst = FIB_RES_PREFSRC(res); |
| 238 | ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST; |
| 239 | } |
| 240 | fib_res_put(&res); |
| 241 | } |
| 242 | return ret; |
| 243 | |
| 244 | last_resort: |
| 245 | if (rpf) |
| 246 | goto e_inval; |
| 247 | *spec_dst = inet_select_addr(dev, 0, RT_SCOPE_UNIVERSE); |
| 248 | *itag = 0; |
| 249 | return 0; |
| 250 | |
| 251 | e_inval_res: |
| 252 | fib_res_put(&res); |
| 253 | e_inval: |
| 254 | return -EINVAL; |
| 255 | } |
| 256 | |
Al Viro | 81f7bf6 | 2006-09-27 18:40:00 -0700 | [diff] [blame] | 257 | static inline __be32 sk_extract_addr(struct sockaddr *addr) |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 258 | { |
| 259 | return ((struct sockaddr_in *) addr)->sin_addr.s_addr; |
| 260 | } |
| 261 | |
| 262 | static int put_rtax(struct nlattr *mx, int len, int type, u32 value) |
| 263 | { |
| 264 | struct nlattr *nla; |
| 265 | |
| 266 | nla = (struct nlattr *) ((char *) mx + len); |
| 267 | nla->nla_type = type; |
| 268 | nla->nla_len = nla_attr_size(4); |
| 269 | *(u32 *) nla_data(nla) = value; |
| 270 | |
| 271 | return len + nla_total_size(4); |
| 272 | } |
| 273 | |
| 274 | static int rtentry_to_fib_config(int cmd, struct rtentry *rt, |
| 275 | struct fib_config *cfg) |
| 276 | { |
Al Viro | 6d85c10 | 2006-09-26 22:15:46 -0700 | [diff] [blame] | 277 | __be32 addr; |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 278 | int plen; |
| 279 | |
| 280 | memset(cfg, 0, sizeof(*cfg)); |
| 281 | |
| 282 | if (rt->rt_dst.sa_family != AF_INET) |
| 283 | return -EAFNOSUPPORT; |
| 284 | |
| 285 | /* |
| 286 | * Check mask for validity: |
| 287 | * a) it must be contiguous. |
| 288 | * b) destination must have all host bits clear. |
| 289 | * c) if application forgot to set correct family (AF_INET), |
| 290 | * reject request unless it is absolutely clear i.e. |
| 291 | * both family and mask are zero. |
| 292 | */ |
| 293 | plen = 32; |
| 294 | addr = sk_extract_addr(&rt->rt_dst); |
| 295 | if (!(rt->rt_flags & RTF_HOST)) { |
Al Viro | 81f7bf6 | 2006-09-27 18:40:00 -0700 | [diff] [blame] | 296 | __be32 mask = sk_extract_addr(&rt->rt_genmask); |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 297 | |
| 298 | if (rt->rt_genmask.sa_family != AF_INET) { |
| 299 | if (mask || rt->rt_genmask.sa_family) |
| 300 | return -EAFNOSUPPORT; |
| 301 | } |
| 302 | |
| 303 | if (bad_mask(mask, addr)) |
| 304 | return -EINVAL; |
| 305 | |
| 306 | plen = inet_mask_len(mask); |
| 307 | } |
| 308 | |
| 309 | cfg->fc_dst_len = plen; |
| 310 | cfg->fc_dst = addr; |
| 311 | |
| 312 | if (cmd != SIOCDELRT) { |
| 313 | cfg->fc_nlflags = NLM_F_CREATE; |
| 314 | cfg->fc_protocol = RTPROT_BOOT; |
| 315 | } |
| 316 | |
| 317 | if (rt->rt_metric) |
| 318 | cfg->fc_priority = rt->rt_metric - 1; |
| 319 | |
| 320 | if (rt->rt_flags & RTF_REJECT) { |
| 321 | cfg->fc_scope = RT_SCOPE_HOST; |
| 322 | cfg->fc_type = RTN_UNREACHABLE; |
| 323 | return 0; |
| 324 | } |
| 325 | |
| 326 | cfg->fc_scope = RT_SCOPE_NOWHERE; |
| 327 | cfg->fc_type = RTN_UNICAST; |
| 328 | |
| 329 | if (rt->rt_dev) { |
| 330 | char *colon; |
| 331 | struct net_device *dev; |
| 332 | char devname[IFNAMSIZ]; |
| 333 | |
| 334 | if (copy_from_user(devname, rt->rt_dev, IFNAMSIZ-1)) |
| 335 | return -EFAULT; |
| 336 | |
| 337 | devname[IFNAMSIZ-1] = 0; |
| 338 | colon = strchr(devname, ':'); |
| 339 | if (colon) |
| 340 | *colon = 0; |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 341 | dev = __dev_get_by_name(&init_net, devname); |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 342 | if (!dev) |
| 343 | return -ENODEV; |
| 344 | cfg->fc_oif = dev->ifindex; |
| 345 | if (colon) { |
| 346 | struct in_ifaddr *ifa; |
| 347 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
| 348 | if (!in_dev) |
| 349 | return -ENODEV; |
| 350 | *colon = ':'; |
| 351 | for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) |
| 352 | if (strcmp(ifa->ifa_label, devname) == 0) |
| 353 | break; |
| 354 | if (ifa == NULL) |
| 355 | return -ENODEV; |
| 356 | cfg->fc_prefsrc = ifa->ifa_local; |
| 357 | } |
| 358 | } |
| 359 | |
| 360 | addr = sk_extract_addr(&rt->rt_gateway); |
| 361 | if (rt->rt_gateway.sa_family == AF_INET && addr) { |
| 362 | cfg->fc_gw = addr; |
| 363 | if (rt->rt_flags & RTF_GATEWAY && |
| 364 | inet_addr_type(addr) == RTN_UNICAST) |
| 365 | cfg->fc_scope = RT_SCOPE_UNIVERSE; |
| 366 | } |
| 367 | |
| 368 | if (cmd == SIOCDELRT) |
| 369 | return 0; |
| 370 | |
| 371 | if (rt->rt_flags & RTF_GATEWAY && !cfg->fc_gw) |
| 372 | return -EINVAL; |
| 373 | |
| 374 | if (cfg->fc_scope == RT_SCOPE_NOWHERE) |
| 375 | cfg->fc_scope = RT_SCOPE_LINK; |
| 376 | |
| 377 | if (rt->rt_flags & (RTF_MTU | RTF_WINDOW | RTF_IRTT)) { |
| 378 | struct nlattr *mx; |
| 379 | int len = 0; |
| 380 | |
| 381 | mx = kzalloc(3 * nla_total_size(4), GFP_KERNEL); |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 382 | if (mx == NULL) |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 383 | return -ENOMEM; |
| 384 | |
| 385 | if (rt->rt_flags & RTF_MTU) |
| 386 | len = put_rtax(mx, len, RTAX_ADVMSS, rt->rt_mtu - 40); |
| 387 | |
| 388 | if (rt->rt_flags & RTF_WINDOW) |
| 389 | len = put_rtax(mx, len, RTAX_WINDOW, rt->rt_window); |
| 390 | |
| 391 | if (rt->rt_flags & RTF_IRTT) |
| 392 | len = put_rtax(mx, len, RTAX_RTT, rt->rt_irtt << 3); |
| 393 | |
| 394 | cfg->fc_mx = mx; |
| 395 | cfg->fc_mx_len = len; |
| 396 | } |
| 397 | |
| 398 | return 0; |
| 399 | } |
| 400 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 401 | /* |
| 402 | * Handle IP routing ioctl calls. These are used to manipulate the routing tables |
| 403 | */ |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 404 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 405 | int ip_rt_ioctl(unsigned int cmd, void __user *arg) |
| 406 | { |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 407 | struct fib_config cfg; |
| 408 | struct rtentry rt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 409 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 410 | |
| 411 | switch (cmd) { |
| 412 | case SIOCADDRT: /* Add a route */ |
| 413 | case SIOCDELRT: /* Delete a route */ |
| 414 | if (!capable(CAP_NET_ADMIN)) |
| 415 | return -EPERM; |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 416 | |
| 417 | if (copy_from_user(&rt, arg, sizeof(rt))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 418 | return -EFAULT; |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 419 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 420 | rtnl_lock(); |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 421 | err = rtentry_to_fib_config(cmd, &rt, &cfg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 422 | if (err == 0) { |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 423 | struct fib_table *tb; |
| 424 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 425 | if (cmd == SIOCDELRT) { |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 426 | tb = fib_get_table(cfg.fc_table); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 427 | if (tb) |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 428 | err = tb->tb_delete(tb, &cfg); |
| 429 | else |
| 430 | err = -ESRCH; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 431 | } else { |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 432 | tb = fib_new_table(cfg.fc_table); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 433 | if (tb) |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 434 | err = tb->tb_insert(tb, &cfg); |
| 435 | else |
| 436 | err = -ENOBUFS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 437 | } |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 438 | |
| 439 | /* allocated by rtentry_to_fib_config() */ |
| 440 | kfree(cfg.fc_mx); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 441 | } |
| 442 | rtnl_unlock(); |
| 443 | return err; |
| 444 | } |
| 445 | return -EINVAL; |
| 446 | } |
| 447 | |
Patrick McHardy | ef7c79e | 2007-06-05 12:38:30 -0700 | [diff] [blame] | 448 | const struct nla_policy rtm_ipv4_policy[RTA_MAX+1] = { |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 449 | [RTA_DST] = { .type = NLA_U32 }, |
| 450 | [RTA_SRC] = { .type = NLA_U32 }, |
| 451 | [RTA_IIF] = { .type = NLA_U32 }, |
| 452 | [RTA_OIF] = { .type = NLA_U32 }, |
| 453 | [RTA_GATEWAY] = { .type = NLA_U32 }, |
| 454 | [RTA_PRIORITY] = { .type = NLA_U32 }, |
| 455 | [RTA_PREFSRC] = { .type = NLA_U32 }, |
| 456 | [RTA_METRICS] = { .type = NLA_NESTED }, |
Thomas Graf | 5176f91 | 2006-08-26 20:13:18 -0700 | [diff] [blame] | 457 | [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) }, |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 458 | [RTA_PROTOINFO] = { .type = NLA_U32 }, |
| 459 | [RTA_FLOW] = { .type = NLA_U32 }, |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 460 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 461 | |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 462 | static int rtm_to_fib_config(struct sk_buff *skb, struct nlmsghdr *nlh, |
| 463 | struct fib_config *cfg) |
| 464 | { |
| 465 | struct nlattr *attr; |
| 466 | int err, remaining; |
| 467 | struct rtmsg *rtm; |
| 468 | |
| 469 | err = nlmsg_validate(nlh, sizeof(*rtm), RTA_MAX, rtm_ipv4_policy); |
| 470 | if (err < 0) |
| 471 | goto errout; |
| 472 | |
| 473 | memset(cfg, 0, sizeof(*cfg)); |
| 474 | |
| 475 | rtm = nlmsg_data(nlh); |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 476 | cfg->fc_dst_len = rtm->rtm_dst_len; |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 477 | cfg->fc_tos = rtm->rtm_tos; |
| 478 | cfg->fc_table = rtm->rtm_table; |
| 479 | cfg->fc_protocol = rtm->rtm_protocol; |
| 480 | cfg->fc_scope = rtm->rtm_scope; |
| 481 | cfg->fc_type = rtm->rtm_type; |
| 482 | cfg->fc_flags = rtm->rtm_flags; |
| 483 | cfg->fc_nlflags = nlh->nlmsg_flags; |
| 484 | |
| 485 | cfg->fc_nlinfo.pid = NETLINK_CB(skb).pid; |
| 486 | cfg->fc_nlinfo.nlh = nlh; |
| 487 | |
Thomas Graf | a0ee18b | 2007-03-24 20:32:54 -0700 | [diff] [blame] | 488 | if (cfg->fc_type > RTN_MAX) { |
| 489 | err = -EINVAL; |
| 490 | goto errout; |
| 491 | } |
| 492 | |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 493 | nlmsg_for_each_attr(attr, nlh, sizeof(struct rtmsg), remaining) { |
Thomas Graf | 8f4c1f9 | 2007-09-12 14:44:36 +0200 | [diff] [blame] | 494 | switch (nla_type(attr)) { |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 495 | case RTA_DST: |
Al Viro | 17fb2c6 | 2006-09-26 22:15:25 -0700 | [diff] [blame] | 496 | cfg->fc_dst = nla_get_be32(attr); |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 497 | break; |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 498 | case RTA_OIF: |
| 499 | cfg->fc_oif = nla_get_u32(attr); |
| 500 | break; |
| 501 | case RTA_GATEWAY: |
Al Viro | 17fb2c6 | 2006-09-26 22:15:25 -0700 | [diff] [blame] | 502 | cfg->fc_gw = nla_get_be32(attr); |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 503 | break; |
| 504 | case RTA_PRIORITY: |
| 505 | cfg->fc_priority = nla_get_u32(attr); |
| 506 | break; |
| 507 | case RTA_PREFSRC: |
Al Viro | 17fb2c6 | 2006-09-26 22:15:25 -0700 | [diff] [blame] | 508 | cfg->fc_prefsrc = nla_get_be32(attr); |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 509 | break; |
| 510 | case RTA_METRICS: |
| 511 | cfg->fc_mx = nla_data(attr); |
| 512 | cfg->fc_mx_len = nla_len(attr); |
| 513 | break; |
| 514 | case RTA_MULTIPATH: |
| 515 | cfg->fc_mp = nla_data(attr); |
| 516 | cfg->fc_mp_len = nla_len(attr); |
| 517 | break; |
| 518 | case RTA_FLOW: |
| 519 | cfg->fc_flow = nla_get_u32(attr); |
| 520 | break; |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 521 | case RTA_TABLE: |
| 522 | cfg->fc_table = nla_get_u32(attr); |
| 523 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 524 | } |
| 525 | } |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 526 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 527 | return 0; |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 528 | errout: |
| 529 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 530 | } |
| 531 | |
Thomas Graf | 63f3444 | 2007-03-22 11:55:17 -0700 | [diff] [blame] | 532 | 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] | 533 | { |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 534 | struct fib_config cfg; |
| 535 | struct fib_table *tb; |
| 536 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 537 | |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 538 | err = rtm_to_fib_config(skb, nlh, &cfg); |
| 539 | if (err < 0) |
| 540 | goto errout; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 541 | |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 542 | tb = fib_get_table(cfg.fc_table); |
| 543 | if (tb == NULL) { |
| 544 | err = -ESRCH; |
| 545 | goto errout; |
| 546 | } |
| 547 | |
| 548 | err = tb->tb_delete(tb, &cfg); |
| 549 | errout: |
| 550 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 551 | } |
| 552 | |
Thomas Graf | 63f3444 | 2007-03-22 11:55:17 -0700 | [diff] [blame] | 553 | 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] | 554 | { |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 555 | struct fib_config cfg; |
| 556 | struct fib_table *tb; |
| 557 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 558 | |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 559 | err = rtm_to_fib_config(skb, nlh, &cfg); |
| 560 | if (err < 0) |
| 561 | goto errout; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 562 | |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 563 | tb = fib_new_table(cfg.fc_table); |
| 564 | if (tb == NULL) { |
| 565 | err = -ENOBUFS; |
| 566 | goto errout; |
| 567 | } |
| 568 | |
| 569 | err = tb->tb_insert(tb, &cfg); |
| 570 | errout: |
| 571 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 572 | } |
| 573 | |
Thomas Graf | 63f3444 | 2007-03-22 11:55:17 -0700 | [diff] [blame] | 574 | 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] | 575 | { |
Patrick McHardy | 1af5a8c | 2006-08-10 23:10:46 -0700 | [diff] [blame] | 576 | unsigned int h, s_h; |
| 577 | unsigned int e = 0, s_e; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 578 | struct fib_table *tb; |
Patrick McHardy | 1af5a8c | 2006-08-10 23:10:46 -0700 | [diff] [blame] | 579 | struct hlist_node *node; |
| 580 | int dumped = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 581 | |
Thomas Graf | be403ea | 2006-08-17 18:15:17 -0700 | [diff] [blame] | 582 | if (nlmsg_len(cb->nlh) >= sizeof(struct rtmsg) && |
| 583 | ((struct rtmsg *) nlmsg_data(cb->nlh))->rtm_flags & RTM_F_CLONED) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 584 | return ip_rt_dump(skb, cb); |
| 585 | |
Patrick McHardy | 1af5a8c | 2006-08-10 23:10:46 -0700 | [diff] [blame] | 586 | s_h = cb->args[0]; |
| 587 | s_e = cb->args[1]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 588 | |
Patrick McHardy | 1af5a8c | 2006-08-10 23:10:46 -0700 | [diff] [blame] | 589 | for (h = s_h; h < FIB_TABLE_HASHSZ; h++, s_e = 0) { |
| 590 | e = 0; |
| 591 | hlist_for_each_entry(tb, node, &fib_table_hash[h], tb_hlist) { |
| 592 | if (e < s_e) |
| 593 | goto next; |
| 594 | if (dumped) |
| 595 | memset(&cb->args[2], 0, sizeof(cb->args) - |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 596 | 2 * sizeof(cb->args[0])); |
Patrick McHardy | 1af5a8c | 2006-08-10 23:10:46 -0700 | [diff] [blame] | 597 | if (tb->tb_dump(tb, skb, cb) < 0) |
| 598 | goto out; |
| 599 | dumped = 1; |
| 600 | next: |
| 601 | e++; |
| 602 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 603 | } |
Patrick McHardy | 1af5a8c | 2006-08-10 23:10:46 -0700 | [diff] [blame] | 604 | out: |
| 605 | cb->args[1] = e; |
| 606 | cb->args[0] = h; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 607 | |
| 608 | return skb->len; |
| 609 | } |
| 610 | |
| 611 | /* Prepare and feed intra-kernel routing request. |
| 612 | Really, it should be netlink message, but :-( netlink |
| 613 | can be not configured, so that we feed it directly |
| 614 | to fib engine. It is legal, because all events occur |
| 615 | only when netlink is already locked. |
| 616 | */ |
| 617 | |
Al Viro | 81f7bf6 | 2006-09-27 18:40:00 -0700 | [diff] [blame] | 618 | 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] | 619 | { |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 620 | struct fib_table *tb; |
| 621 | struct fib_config cfg = { |
| 622 | .fc_protocol = RTPROT_KERNEL, |
| 623 | .fc_type = type, |
| 624 | .fc_dst = dst, |
| 625 | .fc_dst_len = dst_len, |
| 626 | .fc_prefsrc = ifa->ifa_local, |
| 627 | .fc_oif = ifa->ifa_dev->dev->ifindex, |
| 628 | .fc_nlflags = NLM_F_CREATE | NLM_F_APPEND, |
| 629 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 630 | |
| 631 | if (type == RTN_UNICAST) |
| 632 | tb = fib_new_table(RT_TABLE_MAIN); |
| 633 | else |
| 634 | tb = fib_new_table(RT_TABLE_LOCAL); |
| 635 | |
| 636 | if (tb == NULL) |
| 637 | return; |
| 638 | |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 639 | cfg.fc_table = tb->tb_id; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 640 | |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 641 | if (type != RTN_LOCAL) |
| 642 | cfg.fc_scope = RT_SCOPE_LINK; |
| 643 | else |
| 644 | cfg.fc_scope = RT_SCOPE_HOST; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 645 | |
| 646 | if (cmd == RTM_NEWROUTE) |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 647 | tb->tb_insert(tb, &cfg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 648 | else |
Thomas Graf | 4e902c5 | 2006-08-17 18:14:52 -0700 | [diff] [blame] | 649 | tb->tb_delete(tb, &cfg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 650 | } |
| 651 | |
Jamal Hadi Salim | 0ff60a4 | 2005-11-22 14:47:37 -0800 | [diff] [blame] | 652 | void fib_add_ifaddr(struct in_ifaddr *ifa) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 653 | { |
| 654 | struct in_device *in_dev = ifa->ifa_dev; |
| 655 | struct net_device *dev = in_dev->dev; |
| 656 | struct in_ifaddr *prim = ifa; |
Al Viro | a144ea4 | 2006-09-28 18:00:55 -0700 | [diff] [blame] | 657 | __be32 mask = ifa->ifa_mask; |
| 658 | __be32 addr = ifa->ifa_local; |
| 659 | __be32 prefix = ifa->ifa_address&mask; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 660 | |
| 661 | if (ifa->ifa_flags&IFA_F_SECONDARY) { |
| 662 | prim = inet_ifa_byprefix(in_dev, prefix, mask); |
| 663 | if (prim == NULL) { |
| 664 | printk(KERN_DEBUG "fib_add_ifaddr: bug: prim == NULL\n"); |
| 665 | return; |
| 666 | } |
| 667 | } |
| 668 | |
| 669 | fib_magic(RTM_NEWROUTE, RTN_LOCAL, addr, 32, prim); |
| 670 | |
| 671 | if (!(dev->flags&IFF_UP)) |
| 672 | return; |
| 673 | |
| 674 | /* Add broadcast address, if it is explicitly assigned. */ |
Al Viro | a144ea4 | 2006-09-28 18:00:55 -0700 | [diff] [blame] | 675 | if (ifa->ifa_broadcast && ifa->ifa_broadcast != htonl(0xFFFFFFFF)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 676 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim); |
| 677 | |
| 678 | if (!ZERONET(prefix) && !(ifa->ifa_flags&IFA_F_SECONDARY) && |
| 679 | (prefix != addr || ifa->ifa_prefixlen < 32)) { |
| 680 | fib_magic(RTM_NEWROUTE, dev->flags&IFF_LOOPBACK ? RTN_LOCAL : |
| 681 | RTN_UNICAST, prefix, ifa->ifa_prefixlen, prim); |
| 682 | |
| 683 | /* Add network specific broadcasts, when it takes a sense */ |
| 684 | if (ifa->ifa_prefixlen < 31) { |
| 685 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix, 32, prim); |
| 686 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix|~mask, 32, prim); |
| 687 | } |
| 688 | } |
| 689 | } |
| 690 | |
| 691 | static void fib_del_ifaddr(struct in_ifaddr *ifa) |
| 692 | { |
| 693 | struct in_device *in_dev = ifa->ifa_dev; |
| 694 | struct net_device *dev = in_dev->dev; |
| 695 | struct in_ifaddr *ifa1; |
| 696 | struct in_ifaddr *prim = ifa; |
Al Viro | a144ea4 | 2006-09-28 18:00:55 -0700 | [diff] [blame] | 697 | __be32 brd = ifa->ifa_address|~ifa->ifa_mask; |
| 698 | __be32 any = ifa->ifa_address&ifa->ifa_mask; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 699 | #define LOCAL_OK 1 |
| 700 | #define BRD_OK 2 |
| 701 | #define BRD0_OK 4 |
| 702 | #define BRD1_OK 8 |
| 703 | unsigned ok = 0; |
| 704 | |
| 705 | if (!(ifa->ifa_flags&IFA_F_SECONDARY)) |
| 706 | fib_magic(RTM_DELROUTE, dev->flags&IFF_LOOPBACK ? RTN_LOCAL : |
| 707 | RTN_UNICAST, any, ifa->ifa_prefixlen, prim); |
| 708 | else { |
| 709 | prim = inet_ifa_byprefix(in_dev, any, ifa->ifa_mask); |
| 710 | if (prim == NULL) { |
| 711 | printk(KERN_DEBUG "fib_del_ifaddr: bug: prim == NULL\n"); |
| 712 | return; |
| 713 | } |
| 714 | } |
| 715 | |
| 716 | /* Deletion is more complicated than add. |
| 717 | We should take care of not to delete too much :-) |
| 718 | |
| 719 | Scan address list to be sure that addresses are really gone. |
| 720 | */ |
| 721 | |
| 722 | for (ifa1 = in_dev->ifa_list; ifa1; ifa1 = ifa1->ifa_next) { |
| 723 | if (ifa->ifa_local == ifa1->ifa_local) |
| 724 | ok |= LOCAL_OK; |
| 725 | if (ifa->ifa_broadcast == ifa1->ifa_broadcast) |
| 726 | ok |= BRD_OK; |
| 727 | if (brd == ifa1->ifa_broadcast) |
| 728 | ok |= BRD1_OK; |
| 729 | if (any == ifa1->ifa_broadcast) |
| 730 | ok |= BRD0_OK; |
| 731 | } |
| 732 | |
| 733 | if (!(ok&BRD_OK)) |
| 734 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim); |
| 735 | if (!(ok&BRD1_OK)) |
| 736 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, brd, 32, prim); |
| 737 | if (!(ok&BRD0_OK)) |
| 738 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, any, 32, prim); |
| 739 | if (!(ok&LOCAL_OK)) { |
| 740 | fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 32, prim); |
| 741 | |
| 742 | /* Check, that this local address finally disappeared. */ |
| 743 | if (inet_addr_type(ifa->ifa_local) != RTN_LOCAL) { |
| 744 | /* And the last, but not the least thing. |
| 745 | We must flush stray FIB entries. |
| 746 | |
| 747 | First of all, we scan fib_info list searching |
| 748 | for stray nexthop entries, then ignite fib_flush. |
| 749 | */ |
| 750 | if (fib_sync_down(ifa->ifa_local, NULL, 0)) |
| 751 | fib_flush(); |
| 752 | } |
| 753 | } |
| 754 | #undef LOCAL_OK |
| 755 | #undef BRD_OK |
| 756 | #undef BRD0_OK |
| 757 | #undef BRD1_OK |
| 758 | } |
| 759 | |
Robert Olsson | 246955f | 2005-06-20 13:36:39 -0700 | [diff] [blame] | 760 | static void nl_fib_lookup(struct fib_result_nl *frn, struct fib_table *tb ) |
| 761 | { |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 762 | |
Robert Olsson | 246955f | 2005-06-20 13:36:39 -0700 | [diff] [blame] | 763 | struct fib_result res; |
Thomas Graf | 5f300893 | 2006-11-09 15:21:41 -0800 | [diff] [blame] | 764 | struct flowi fl = { .mark = frn->fl_mark, |
Thomas Graf | 47dcf0c | 2006-11-09 15:20:38 -0800 | [diff] [blame] | 765 | .nl_u = { .ip4_u = { .daddr = frn->fl_addr, |
Robert Olsson | 246955f | 2005-06-20 13:36:39 -0700 | [diff] [blame] | 766 | .tos = frn->fl_tos, |
| 767 | .scope = frn->fl_scope } } }; |
Alexey Kuznetsov | 1194ed0 | 2007-04-25 13:07:28 -0700 | [diff] [blame] | 768 | |
Sergey Vlasov | 912a41a | 2007-04-27 02:17:19 -0700 | [diff] [blame] | 769 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
| 770 | res.r = NULL; |
| 771 | #endif |
| 772 | |
Alexey Kuznetsov | 1194ed0 | 2007-04-25 13:07:28 -0700 | [diff] [blame] | 773 | frn->err = -ENOENT; |
Robert Olsson | 246955f | 2005-06-20 13:36:39 -0700 | [diff] [blame] | 774 | if (tb) { |
| 775 | local_bh_disable(); |
| 776 | |
| 777 | frn->tb_id = tb->tb_id; |
| 778 | frn->err = tb->tb_lookup(tb, &fl, &res); |
| 779 | |
| 780 | if (!frn->err) { |
| 781 | frn->prefixlen = res.prefixlen; |
| 782 | frn->nh_sel = res.nh_sel; |
| 783 | frn->type = res.type; |
| 784 | frn->scope = res.scope; |
Alexey Kuznetsov | 1194ed0 | 2007-04-25 13:07:28 -0700 | [diff] [blame] | 785 | fib_res_put(&res); |
Robert Olsson | 246955f | 2005-06-20 13:36:39 -0700 | [diff] [blame] | 786 | } |
| 787 | local_bh_enable(); |
| 788 | } |
| 789 | } |
| 790 | |
David S. Miller | 28f7b036 | 2007-10-10 21:32:39 -0700 | [diff] [blame] | 791 | static void nl_fib_input(struct sk_buff *skb) |
Robert Olsson | 246955f | 2005-06-20 13:36:39 -0700 | [diff] [blame] | 792 | { |
Robert Olsson | 246955f | 2005-06-20 13:36:39 -0700 | [diff] [blame] | 793 | struct fib_result_nl *frn; |
David S. Miller | 28f7b036 | 2007-10-10 21:32:39 -0700 | [diff] [blame] | 794 | struct nlmsghdr *nlh; |
Robert Olsson | 246955f | 2005-06-20 13:36:39 -0700 | [diff] [blame] | 795 | struct fib_table *tb; |
David S. Miller | 28f7b036 | 2007-10-10 21:32:39 -0700 | [diff] [blame] | 796 | u32 pid; |
Alexey Kuznetsov | 1194ed0 | 2007-04-25 13:07:28 -0700 | [diff] [blame] | 797 | |
Arnaldo Carvalho de Melo | b529ccf | 2007-04-25 19:08:35 -0700 | [diff] [blame] | 798 | nlh = nlmsg_hdr(skb); |
Thomas Graf | ea86575 | 2005-12-01 14:30:00 -0800 | [diff] [blame] | 799 | if (skb->len < NLMSG_SPACE(0) || skb->len < nlh->nlmsg_len || |
| 800 | nlh->nlmsg_len < NLMSG_LENGTH(sizeof(*frn))) { |
| 801 | kfree_skb(skb); |
| 802 | return; |
| 803 | } |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 804 | |
Robert Olsson | 246955f | 2005-06-20 13:36:39 -0700 | [diff] [blame] | 805 | frn = (struct fib_result_nl *) NLMSG_DATA(nlh); |
| 806 | tb = fib_get_table(frn->tb_id_in); |
| 807 | |
| 808 | nl_fib_lookup(frn, tb); |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 809 | |
Alexey Kuznetsov | 1194ed0 | 2007-04-25 13:07:28 -0700 | [diff] [blame] | 810 | pid = NETLINK_CB(skb).pid; /* pid of sending process */ |
Robert Olsson | 246955f | 2005-06-20 13:36:39 -0700 | [diff] [blame] | 811 | NETLINK_CB(skb).pid = 0; /* from kernel */ |
Patrick McHardy | ac6d439 | 2005-08-14 19:29:52 -0700 | [diff] [blame] | 812 | NETLINK_CB(skb).dst_group = 0; /* unicast */ |
Denis V. Lunev | cd40b7d | 2007-10-10 21:15:29 -0700 | [diff] [blame] | 813 | netlink_unicast(fibnl, skb, pid, MSG_DONTWAIT); |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 814 | } |
Robert Olsson | 246955f | 2005-06-20 13:36:39 -0700 | [diff] [blame] | 815 | |
| 816 | static void nl_fib_lookup_init(void) |
| 817 | { |
Denis V. Lunev | cd40b7d | 2007-10-10 21:15:29 -0700 | [diff] [blame] | 818 | fibnl = netlink_kernel_create(&init_net, NETLINK_FIB_LOOKUP, 0, |
| 819 | nl_fib_input, NULL, THIS_MODULE); |
Robert Olsson | 246955f | 2005-06-20 13:36:39 -0700 | [diff] [blame] | 820 | } |
| 821 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 822 | static void fib_disable_ip(struct net_device *dev, int force) |
| 823 | { |
| 824 | if (fib_sync_down(0, dev, force)) |
| 825 | fib_flush(); |
| 826 | rt_cache_flush(0); |
| 827 | arp_ifdown(dev); |
| 828 | } |
| 829 | |
| 830 | static int fib_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr) |
| 831 | { |
| 832 | struct in_ifaddr *ifa = (struct in_ifaddr*)ptr; |
| 833 | |
| 834 | switch (event) { |
| 835 | case NETDEV_UP: |
| 836 | fib_add_ifaddr(ifa); |
| 837 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
| 838 | fib_sync_up(ifa->ifa_dev->dev); |
| 839 | #endif |
| 840 | rt_cache_flush(-1); |
| 841 | break; |
| 842 | case NETDEV_DOWN: |
| 843 | fib_del_ifaddr(ifa); |
Jayachandran C | 9fcc2e8 | 2005-10-27 15:10:01 -0700 | [diff] [blame] | 844 | if (ifa->ifa_dev->ifa_list == NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 845 | /* Last address was deleted from this interface. |
| 846 | Disable IP. |
| 847 | */ |
| 848 | fib_disable_ip(ifa->ifa_dev->dev, 1); |
| 849 | } else { |
| 850 | rt_cache_flush(-1); |
| 851 | } |
| 852 | break; |
| 853 | } |
| 854 | return NOTIFY_DONE; |
| 855 | } |
| 856 | |
| 857 | static int fib_netdev_event(struct notifier_block *this, unsigned long event, void *ptr) |
| 858 | { |
| 859 | struct net_device *dev = ptr; |
Herbert Xu | e5ed639 | 2005-10-03 14:35:55 -0700 | [diff] [blame] | 860 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 861 | |
Eric W. Biederman | e9dc865 | 2007-09-12 13:02:17 +0200 | [diff] [blame] | 862 | if (dev->nd_net != &init_net) |
| 863 | return NOTIFY_DONE; |
| 864 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 865 | if (event == NETDEV_UNREGISTER) { |
| 866 | fib_disable_ip(dev, 2); |
| 867 | return NOTIFY_DONE; |
| 868 | } |
| 869 | |
| 870 | if (!in_dev) |
| 871 | return NOTIFY_DONE; |
| 872 | |
| 873 | switch (event) { |
| 874 | case NETDEV_UP: |
| 875 | for_ifa(in_dev) { |
| 876 | fib_add_ifaddr(ifa); |
| 877 | } endfor_ifa(in_dev); |
| 878 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
| 879 | fib_sync_up(dev); |
| 880 | #endif |
| 881 | rt_cache_flush(-1); |
| 882 | break; |
| 883 | case NETDEV_DOWN: |
| 884 | fib_disable_ip(dev, 0); |
| 885 | break; |
| 886 | case NETDEV_CHANGEMTU: |
| 887 | case NETDEV_CHANGE: |
| 888 | rt_cache_flush(0); |
| 889 | break; |
| 890 | } |
| 891 | return NOTIFY_DONE; |
| 892 | } |
| 893 | |
| 894 | static struct notifier_block fib_inetaddr_notifier = { |
| 895 | .notifier_call =fib_inetaddr_event, |
| 896 | }; |
| 897 | |
| 898 | static struct notifier_block fib_netdev_notifier = { |
| 899 | .notifier_call =fib_netdev_event, |
| 900 | }; |
| 901 | |
| 902 | void __init ip_fib_init(void) |
| 903 | { |
Patrick McHardy | 1af5a8c | 2006-08-10 23:10:46 -0700 | [diff] [blame] | 904 | unsigned int i; |
| 905 | |
| 906 | for (i = 0; i < FIB_TABLE_HASHSZ; i++) |
| 907 | INIT_HLIST_HEAD(&fib_table_hash[i]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 908 | #ifndef CONFIG_IP_MULTIPLE_TABLES |
| 909 | ip_fib_local_table = fib_hash_init(RT_TABLE_LOCAL); |
Patrick McHardy | 1af5a8c | 2006-08-10 23:10:46 -0700 | [diff] [blame] | 910 | hlist_add_head_rcu(&ip_fib_local_table->tb_hlist, &fib_table_hash[0]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 911 | ip_fib_main_table = fib_hash_init(RT_TABLE_MAIN); |
Patrick McHardy | 1af5a8c | 2006-08-10 23:10:46 -0700 | [diff] [blame] | 912 | hlist_add_head_rcu(&ip_fib_main_table->tb_hlist, &fib_table_hash[0]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 913 | #else |
Thomas Graf | e1ef4bf | 2006-08-04 03:39:22 -0700 | [diff] [blame] | 914 | fib4_rules_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 915 | #endif |
| 916 | |
| 917 | register_netdevice_notifier(&fib_netdev_notifier); |
| 918 | register_inetaddr_notifier(&fib_inetaddr_notifier); |
Robert Olsson | 246955f | 2005-06-20 13:36:39 -0700 | [diff] [blame] | 919 | nl_fib_lookup_init(); |
Thomas Graf | 63f3444 | 2007-03-22 11:55:17 -0700 | [diff] [blame] | 920 | |
| 921 | rtnl_register(PF_INET, RTM_NEWROUTE, inet_rtm_newroute, NULL); |
| 922 | rtnl_register(PF_INET, RTM_DELROUTE, inet_rtm_delroute, NULL); |
| 923 | rtnl_register(PF_INET, RTM_GETROUTE, NULL, inet_dump_fib); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 924 | } |
| 925 | |
| 926 | EXPORT_SYMBOL(inet_addr_type); |
Sean Hefty | a1e8733 | 2006-06-17 20:37:28 -0700 | [diff] [blame] | 927 | EXPORT_SYMBOL(ip_dev_find); |