Commit | Line | Data |
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1da177e4 LT |
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 | * | |
1da177e4 LT |
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 | ||
1da177e4 LT |
16 | #include <linux/module.h> |
17 | #include <asm/uaccess.h> | |
18 | #include <asm/system.h> | |
19 | #include <linux/bitops.h> | |
4fc268d2 | 20 | #include <linux/capability.h> |
1da177e4 LT |
21 | #include <linux/types.h> |
22 | #include <linux/kernel.h> | |
1da177e4 LT |
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> | |
14c85021 | 30 | #include <linux/inetdevice.h> |
1da177e4 | 31 | #include <linux/netdevice.h> |
1823730f | 32 | #include <linux/if_addr.h> |
1da177e4 LT |
33 | #include <linux/if_arp.h> |
34 | #include <linux/skbuff.h> | |
1da177e4 | 35 | #include <linux/init.h> |
1af5a8c4 | 36 | #include <linux/list.h> |
5a0e3ad6 | 37 | #include <linux/slab.h> |
1da177e4 LT |
38 | |
39 | #include <net/ip.h> | |
40 | #include <net/protocol.h> | |
41 | #include <net/route.h> | |
42 | #include <net/tcp.h> | |
43 | #include <net/sock.h> | |
1da177e4 LT |
44 | #include <net/arp.h> |
45 | #include <net/ip_fib.h> | |
63f3444f | 46 | #include <net/rtnetlink.h> |
1da177e4 | 47 | |
1da177e4 LT |
48 | #ifndef CONFIG_IP_MULTIPLE_TABLES |
49 | ||
7b1a74fd | 50 | static int __net_init fib4_rules_init(struct net *net) |
c3e9a353 | 51 | { |
93456b6d DL |
52 | struct fib_table *local_table, *main_table; |
53 | ||
7f9b8052 | 54 | local_table = fib_hash_table(RT_TABLE_LOCAL); |
93456b6d | 55 | if (local_table == NULL) |
dbb50165 DL |
56 | return -ENOMEM; |
57 | ||
7f9b8052 | 58 | main_table = fib_hash_table(RT_TABLE_MAIN); |
93456b6d | 59 | if (main_table == NULL) |
dbb50165 DL |
60 | goto fail; |
61 | ||
93456b6d | 62 | hlist_add_head_rcu(&local_table->tb_hlist, |
e4aef8ae | 63 | &net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX]); |
93456b6d | 64 | hlist_add_head_rcu(&main_table->tb_hlist, |
e4aef8ae | 65 | &net->ipv4.fib_table_hash[TABLE_MAIN_INDEX]); |
dbb50165 DL |
66 | return 0; |
67 | ||
68 | fail: | |
93456b6d | 69 | kfree(local_table); |
dbb50165 | 70 | return -ENOMEM; |
c3e9a353 | 71 | } |
1af5a8c4 | 72 | #else |
1da177e4 | 73 | |
8ad4942c | 74 | struct fib_table *fib_new_table(struct net *net, u32 id) |
1da177e4 LT |
75 | { |
76 | struct fib_table *tb; | |
1af5a8c4 | 77 | unsigned int h; |
1da177e4 | 78 | |
1af5a8c4 PM |
79 | if (id == 0) |
80 | id = RT_TABLE_MAIN; | |
8ad4942c | 81 | tb = fib_get_table(net, id); |
1af5a8c4 PM |
82 | if (tb) |
83 | return tb; | |
7f9b8052 SH |
84 | |
85 | tb = fib_hash_table(id); | |
1da177e4 LT |
86 | if (!tb) |
87 | return NULL; | |
1af5a8c4 | 88 | h = id & (FIB_TABLE_HASHSZ - 1); |
e4aef8ae | 89 | hlist_add_head_rcu(&tb->tb_hlist, &net->ipv4.fib_table_hash[h]); |
1da177e4 LT |
90 | return tb; |
91 | } | |
92 | ||
8ad4942c | 93 | struct fib_table *fib_get_table(struct net *net, u32 id) |
1af5a8c4 PM |
94 | { |
95 | struct fib_table *tb; | |
96 | struct hlist_node *node; | |
e4aef8ae | 97 | struct hlist_head *head; |
1af5a8c4 | 98 | unsigned int h; |
1da177e4 | 99 | |
1af5a8c4 PM |
100 | if (id == 0) |
101 | id = RT_TABLE_MAIN; | |
102 | h = id & (FIB_TABLE_HASHSZ - 1); | |
e4aef8ae | 103 | |
1af5a8c4 | 104 | rcu_read_lock(); |
e4aef8ae DL |
105 | head = &net->ipv4.fib_table_hash[h]; |
106 | hlist_for_each_entry_rcu(tb, node, head, tb_hlist) { | |
1af5a8c4 PM |
107 | if (tb->tb_id == id) { |
108 | rcu_read_unlock(); | |
109 | return tb; | |
110 | } | |
111 | } | |
112 | rcu_read_unlock(); | |
113 | return NULL; | |
114 | } | |
1da177e4 LT |
115 | #endif /* CONFIG_IP_MULTIPLE_TABLES */ |
116 | ||
010278ec DL |
117 | void fib_select_default(struct net *net, |
118 | const struct flowi *flp, struct fib_result *res) | |
64c2d538 DL |
119 | { |
120 | struct fib_table *tb; | |
121 | int table = RT_TABLE_MAIN; | |
122 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
123 | if (res->r == NULL || res->r->action != FR_ACT_TO_TBL) | |
124 | return; | |
125 | table = res->r->table; | |
126 | #endif | |
010278ec | 127 | tb = fib_get_table(net, table); |
64c2d538 | 128 | if (FIB_RES_GW(*res) && FIB_RES_NH(*res).nh_scope == RT_SCOPE_LINK) |
16c6cf8b | 129 | fib_table_select_default(tb, flp, res); |
64c2d538 DL |
130 | } |
131 | ||
e4aef8ae | 132 | static void fib_flush(struct net *net) |
1da177e4 LT |
133 | { |
134 | int flushed = 0; | |
1da177e4 | 135 | struct fib_table *tb; |
1af5a8c4 | 136 | struct hlist_node *node; |
e4aef8ae | 137 | struct hlist_head *head; |
1af5a8c4 | 138 | unsigned int h; |
1da177e4 | 139 | |
1af5a8c4 | 140 | for (h = 0; h < FIB_TABLE_HASHSZ; h++) { |
e4aef8ae DL |
141 | head = &net->ipv4.fib_table_hash[h]; |
142 | hlist_for_each_entry(tb, node, head, tb_hlist) | |
16c6cf8b | 143 | flushed += fib_table_flush(tb); |
1da177e4 | 144 | } |
1da177e4 LT |
145 | |
146 | if (flushed) | |
76e6ebfb | 147 | rt_cache_flush(net, -1); |
1da177e4 LT |
148 | } |
149 | ||
82efee14 ED |
150 | /** |
151 | * __ip_dev_find - find the first device with a given source address. | |
152 | * @net: the net namespace | |
153 | * @addr: the source address | |
154 | * @devref: if true, take a reference on the found device | |
155 | * | |
9e917dca | 156 | * If a caller uses devref=false, it should be protected by RCU, or RTNL |
1da177e4 | 157 | */ |
82efee14 | 158 | struct net_device *__ip_dev_find(struct net *net, __be32 addr, bool devref) |
1da177e4 | 159 | { |
82efee14 | 160 | struct flowi fl = { |
5811662b | 161 | .fl4_dst = addr, |
82efee14 ED |
162 | .flags = FLOWI_FLAG_MATCH_ANY_IIF |
163 | }; | |
164 | struct fib_result res = { 0 }; | |
1da177e4 LT |
165 | struct net_device *dev = NULL; |
166 | ||
ebc0ffae ED |
167 | rcu_read_lock(); |
168 | if (fib_lookup(net, &fl, &res)) { | |
169 | rcu_read_unlock(); | |
1da177e4 | 170 | return NULL; |
ebc0ffae | 171 | } |
1da177e4 LT |
172 | if (res.type != RTN_LOCAL) |
173 | goto out; | |
174 | dev = FIB_RES_DEV(res); | |
175 | ||
82efee14 | 176 | if (dev && devref) |
1da177e4 LT |
177 | dev_hold(dev); |
178 | out: | |
ebc0ffae | 179 | rcu_read_unlock(); |
1da177e4 LT |
180 | return dev; |
181 | } | |
82efee14 | 182 | EXPORT_SYMBOL(__ip_dev_find); |
1da177e4 | 183 | |
05538116 LAT |
184 | /* |
185 | * Find address type as if only "dev" was present in the system. If | |
186 | * on_dev is NULL then all interfaces are taken into consideration. | |
187 | */ | |
6b175b26 EB |
188 | static inline unsigned __inet_dev_addr_type(struct net *net, |
189 | const struct net_device *dev, | |
05538116 | 190 | __be32 addr) |
1da177e4 | 191 | { |
5811662b | 192 | struct flowi fl = { .fl4_dst = addr }; |
1da177e4 LT |
193 | struct fib_result res; |
194 | unsigned ret = RTN_BROADCAST; | |
03cf786c | 195 | struct fib_table *local_table; |
1da177e4 | 196 | |
1e637c74 | 197 | if (ipv4_is_zeronet(addr) || ipv4_is_lbcast(addr)) |
1da177e4 | 198 | return RTN_BROADCAST; |
f97c1e0c | 199 | if (ipv4_is_multicast(addr)) |
1da177e4 LT |
200 | return RTN_MULTICAST; |
201 | ||
202 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
203 | res.r = NULL; | |
204 | #endif | |
e905a9ed | 205 | |
6b175b26 | 206 | local_table = fib_get_table(net, RT_TABLE_LOCAL); |
03cf786c | 207 | if (local_table) { |
1da177e4 | 208 | ret = RTN_UNICAST; |
ebc0ffae ED |
209 | rcu_read_lock(); |
210 | if (!fib_table_lookup(local_table, &fl, &res, FIB_LOOKUP_NOREF)) { | |
05538116 LAT |
211 | if (!dev || dev == res.fi->fib_dev) |
212 | ret = res.type; | |
1da177e4 | 213 | } |
ebc0ffae | 214 | rcu_read_unlock(); |
1da177e4 LT |
215 | } |
216 | return ret; | |
217 | } | |
218 | ||
6b175b26 | 219 | unsigned int inet_addr_type(struct net *net, __be32 addr) |
05538116 | 220 | { |
6b175b26 | 221 | return __inet_dev_addr_type(net, NULL, addr); |
05538116 | 222 | } |
4bc2f18b | 223 | EXPORT_SYMBOL(inet_addr_type); |
05538116 | 224 | |
6b175b26 EB |
225 | unsigned int inet_dev_addr_type(struct net *net, const struct net_device *dev, |
226 | __be32 addr) | |
05538116 | 227 | { |
6a31d2a9 | 228 | return __inet_dev_addr_type(net, dev, addr); |
05538116 | 229 | } |
4bc2f18b | 230 | EXPORT_SYMBOL(inet_dev_addr_type); |
05538116 | 231 | |
1da177e4 | 232 | /* Given (packet source, input interface) and optional (dst, oif, tos): |
6a31d2a9 ED |
233 | * - (main) check, that source is valid i.e. not broadcast or our local |
234 | * address. | |
235 | * - figure out what "logical" interface this packet arrived | |
236 | * and calculate "specific destination" address. | |
237 | * - check, that packet arrived from expected physical interface. | |
ebc0ffae | 238 | * called with rcu_read_lock() |
1da177e4 | 239 | */ |
d9c9df8c | 240 | int fib_validate_source(__be32 src, __be32 dst, u8 tos, int oif, |
b0c110ca | 241 | struct net_device *dev, __be32 *spec_dst, |
242 | u32 *itag, u32 mark) | |
1da177e4 LT |
243 | { |
244 | struct in_device *in_dev; | |
6a31d2a9 | 245 | struct flowi fl = { |
5811662b CG |
246 | .fl4_dst = src, |
247 | .fl4_src = dst, | |
248 | .fl4_tos = tos, | |
6a31d2a9 ED |
249 | .mark = mark, |
250 | .iif = oif | |
251 | }; | |
1da177e4 | 252 | struct fib_result res; |
8153a10c | 253 | int no_addr, rpf, accept_local; |
6f86b325 | 254 | bool dev_match; |
1da177e4 | 255 | int ret; |
5b707aaa | 256 | struct net *net; |
1da177e4 | 257 | |
8153a10c | 258 | no_addr = rpf = accept_local = 0; |
e5ed6399 | 259 | in_dev = __in_dev_get_rcu(dev); |
1da177e4 LT |
260 | if (in_dev) { |
261 | no_addr = in_dev->ifa_list == NULL; | |
262 | rpf = IN_DEV_RPFILTER(in_dev); | |
8153a10c | 263 | accept_local = IN_DEV_ACCEPT_LOCAL(in_dev); |
28f6aeea JHS |
264 | if (mark && !IN_DEV_SRC_VMARK(in_dev)) |
265 | fl.mark = 0; | |
1da177e4 | 266 | } |
1da177e4 LT |
267 | |
268 | if (in_dev == NULL) | |
269 | goto e_inval; | |
270 | ||
c346dca1 | 271 | net = dev_net(dev); |
5b707aaa | 272 | if (fib_lookup(net, &fl, &res)) |
1da177e4 | 273 | goto last_resort; |
8153a10c PM |
274 | if (res.type != RTN_UNICAST) { |
275 | if (res.type != RTN_LOCAL || !accept_local) | |
ebc0ffae | 276 | goto e_inval; |
8153a10c | 277 | } |
1da177e4 LT |
278 | *spec_dst = FIB_RES_PREFSRC(res); |
279 | fib_combine_itag(itag, &res); | |
6f86b325 DM |
280 | dev_match = false; |
281 | ||
1da177e4 | 282 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
6f86b325 DM |
283 | for (ret = 0; ret < res.fi->fib_nhs; ret++) { |
284 | struct fib_nh *nh = &res.fi->fib_nh[ret]; | |
285 | ||
286 | if (nh->nh_dev == dev) { | |
287 | dev_match = true; | |
288 | break; | |
289 | } | |
290 | } | |
1da177e4 LT |
291 | #else |
292 | if (FIB_RES_DEV(res) == dev) | |
6f86b325 | 293 | dev_match = true; |
1da177e4 | 294 | #endif |
6f86b325 | 295 | if (dev_match) { |
1da177e4 | 296 | ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST; |
1da177e4 LT |
297 | return ret; |
298 | } | |
1da177e4 LT |
299 | if (no_addr) |
300 | goto last_resort; | |
c1cf8422 | 301 | if (rpf == 1) |
b5f7e755 | 302 | goto e_rpf; |
1da177e4 LT |
303 | fl.oif = dev->ifindex; |
304 | ||
305 | ret = 0; | |
5b707aaa | 306 | if (fib_lookup(net, &fl, &res) == 0) { |
1da177e4 LT |
307 | if (res.type == RTN_UNICAST) { |
308 | *spec_dst = FIB_RES_PREFSRC(res); | |
309 | ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST; | |
310 | } | |
1da177e4 LT |
311 | } |
312 | return ret; | |
313 | ||
314 | last_resort: | |
315 | if (rpf) | |
b5f7e755 | 316 | goto e_rpf; |
1da177e4 LT |
317 | *spec_dst = inet_select_addr(dev, 0, RT_SCOPE_UNIVERSE); |
318 | *itag = 0; | |
319 | return 0; | |
320 | ||
1da177e4 LT |
321 | e_inval: |
322 | return -EINVAL; | |
b5f7e755 ED |
323 | e_rpf: |
324 | return -EXDEV; | |
1da177e4 LT |
325 | } |
326 | ||
81f7bf6c | 327 | static inline __be32 sk_extract_addr(struct sockaddr *addr) |
4e902c57 TG |
328 | { |
329 | return ((struct sockaddr_in *) addr)->sin_addr.s_addr; | |
330 | } | |
331 | ||
332 | static int put_rtax(struct nlattr *mx, int len, int type, u32 value) | |
333 | { | |
334 | struct nlattr *nla; | |
335 | ||
336 | nla = (struct nlattr *) ((char *) mx + len); | |
337 | nla->nla_type = type; | |
338 | nla->nla_len = nla_attr_size(4); | |
339 | *(u32 *) nla_data(nla) = value; | |
340 | ||
341 | return len + nla_total_size(4); | |
342 | } | |
343 | ||
4b5d47d4 | 344 | static int rtentry_to_fib_config(struct net *net, int cmd, struct rtentry *rt, |
4e902c57 TG |
345 | struct fib_config *cfg) |
346 | { | |
6d85c10a | 347 | __be32 addr; |
4e902c57 TG |
348 | int plen; |
349 | ||
350 | memset(cfg, 0, sizeof(*cfg)); | |
4b5d47d4 | 351 | cfg->fc_nlinfo.nl_net = net; |
4e902c57 TG |
352 | |
353 | if (rt->rt_dst.sa_family != AF_INET) | |
354 | return -EAFNOSUPPORT; | |
355 | ||
356 | /* | |
357 | * Check mask for validity: | |
358 | * a) it must be contiguous. | |
359 | * b) destination must have all host bits clear. | |
360 | * c) if application forgot to set correct family (AF_INET), | |
361 | * reject request unless it is absolutely clear i.e. | |
362 | * both family and mask are zero. | |
363 | */ | |
364 | plen = 32; | |
365 | addr = sk_extract_addr(&rt->rt_dst); | |
366 | if (!(rt->rt_flags & RTF_HOST)) { | |
81f7bf6c | 367 | __be32 mask = sk_extract_addr(&rt->rt_genmask); |
4e902c57 TG |
368 | |
369 | if (rt->rt_genmask.sa_family != AF_INET) { | |
370 | if (mask || rt->rt_genmask.sa_family) | |
371 | return -EAFNOSUPPORT; | |
372 | } | |
373 | ||
374 | if (bad_mask(mask, addr)) | |
375 | return -EINVAL; | |
376 | ||
377 | plen = inet_mask_len(mask); | |
378 | } | |
379 | ||
380 | cfg->fc_dst_len = plen; | |
381 | cfg->fc_dst = addr; | |
382 | ||
383 | if (cmd != SIOCDELRT) { | |
384 | cfg->fc_nlflags = NLM_F_CREATE; | |
385 | cfg->fc_protocol = RTPROT_BOOT; | |
386 | } | |
387 | ||
388 | if (rt->rt_metric) | |
389 | cfg->fc_priority = rt->rt_metric - 1; | |
390 | ||
391 | if (rt->rt_flags & RTF_REJECT) { | |
392 | cfg->fc_scope = RT_SCOPE_HOST; | |
393 | cfg->fc_type = RTN_UNREACHABLE; | |
394 | return 0; | |
395 | } | |
396 | ||
397 | cfg->fc_scope = RT_SCOPE_NOWHERE; | |
398 | cfg->fc_type = RTN_UNICAST; | |
399 | ||
400 | if (rt->rt_dev) { | |
401 | char *colon; | |
402 | struct net_device *dev; | |
403 | char devname[IFNAMSIZ]; | |
404 | ||
405 | if (copy_from_user(devname, rt->rt_dev, IFNAMSIZ-1)) | |
406 | return -EFAULT; | |
407 | ||
408 | devname[IFNAMSIZ-1] = 0; | |
409 | colon = strchr(devname, ':'); | |
410 | if (colon) | |
411 | *colon = 0; | |
4b5d47d4 | 412 | dev = __dev_get_by_name(net, devname); |
4e902c57 TG |
413 | if (!dev) |
414 | return -ENODEV; | |
415 | cfg->fc_oif = dev->ifindex; | |
416 | if (colon) { | |
417 | struct in_ifaddr *ifa; | |
418 | struct in_device *in_dev = __in_dev_get_rtnl(dev); | |
419 | if (!in_dev) | |
420 | return -ENODEV; | |
421 | *colon = ':'; | |
422 | for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) | |
423 | if (strcmp(ifa->ifa_label, devname) == 0) | |
424 | break; | |
425 | if (ifa == NULL) | |
426 | return -ENODEV; | |
427 | cfg->fc_prefsrc = ifa->ifa_local; | |
428 | } | |
429 | } | |
430 | ||
431 | addr = sk_extract_addr(&rt->rt_gateway); | |
432 | if (rt->rt_gateway.sa_family == AF_INET && addr) { | |
433 | cfg->fc_gw = addr; | |
434 | if (rt->rt_flags & RTF_GATEWAY && | |
4b5d47d4 | 435 | inet_addr_type(net, addr) == RTN_UNICAST) |
4e902c57 TG |
436 | cfg->fc_scope = RT_SCOPE_UNIVERSE; |
437 | } | |
438 | ||
439 | if (cmd == SIOCDELRT) | |
440 | return 0; | |
441 | ||
442 | if (rt->rt_flags & RTF_GATEWAY && !cfg->fc_gw) | |
443 | return -EINVAL; | |
444 | ||
445 | if (cfg->fc_scope == RT_SCOPE_NOWHERE) | |
446 | cfg->fc_scope = RT_SCOPE_LINK; | |
447 | ||
448 | if (rt->rt_flags & (RTF_MTU | RTF_WINDOW | RTF_IRTT)) { | |
449 | struct nlattr *mx; | |
450 | int len = 0; | |
451 | ||
452 | mx = kzalloc(3 * nla_total_size(4), GFP_KERNEL); | |
e905a9ed | 453 | if (mx == NULL) |
4e902c57 TG |
454 | return -ENOMEM; |
455 | ||
456 | if (rt->rt_flags & RTF_MTU) | |
457 | len = put_rtax(mx, len, RTAX_ADVMSS, rt->rt_mtu - 40); | |
458 | ||
459 | if (rt->rt_flags & RTF_WINDOW) | |
460 | len = put_rtax(mx, len, RTAX_WINDOW, rt->rt_window); | |
461 | ||
462 | if (rt->rt_flags & RTF_IRTT) | |
463 | len = put_rtax(mx, len, RTAX_RTT, rt->rt_irtt << 3); | |
464 | ||
465 | cfg->fc_mx = mx; | |
466 | cfg->fc_mx_len = len; | |
467 | } | |
468 | ||
469 | return 0; | |
470 | } | |
471 | ||
1da177e4 | 472 | /* |
6a31d2a9 ED |
473 | * Handle IP routing ioctl calls. |
474 | * These are used to manipulate the routing tables | |
1da177e4 | 475 | */ |
1bad118a | 476 | int ip_rt_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
1da177e4 | 477 | { |
4e902c57 TG |
478 | struct fib_config cfg; |
479 | struct rtentry rt; | |
1da177e4 | 480 | int err; |
1da177e4 LT |
481 | |
482 | switch (cmd) { | |
483 | case SIOCADDRT: /* Add a route */ | |
484 | case SIOCDELRT: /* Delete a route */ | |
485 | if (!capable(CAP_NET_ADMIN)) | |
486 | return -EPERM; | |
4e902c57 TG |
487 | |
488 | if (copy_from_user(&rt, arg, sizeof(rt))) | |
1da177e4 | 489 | return -EFAULT; |
4e902c57 | 490 | |
1da177e4 | 491 | rtnl_lock(); |
1bad118a | 492 | err = rtentry_to_fib_config(net, cmd, &rt, &cfg); |
1da177e4 | 493 | if (err == 0) { |
4e902c57 TG |
494 | struct fib_table *tb; |
495 | ||
1da177e4 | 496 | if (cmd == SIOCDELRT) { |
1bad118a | 497 | tb = fib_get_table(net, cfg.fc_table); |
1da177e4 | 498 | if (tb) |
16c6cf8b | 499 | err = fib_table_delete(tb, &cfg); |
4e902c57 TG |
500 | else |
501 | err = -ESRCH; | |
1da177e4 | 502 | } else { |
1bad118a | 503 | tb = fib_new_table(net, cfg.fc_table); |
1da177e4 | 504 | if (tb) |
16c6cf8b | 505 | err = fib_table_insert(tb, &cfg); |
4e902c57 TG |
506 | else |
507 | err = -ENOBUFS; | |
1da177e4 | 508 | } |
4e902c57 TG |
509 | |
510 | /* allocated by rtentry_to_fib_config() */ | |
511 | kfree(cfg.fc_mx); | |
1da177e4 LT |
512 | } |
513 | rtnl_unlock(); | |
514 | return err; | |
515 | } | |
516 | return -EINVAL; | |
517 | } | |
518 | ||
6a31d2a9 | 519 | const struct nla_policy rtm_ipv4_policy[RTA_MAX + 1] = { |
4e902c57 TG |
520 | [RTA_DST] = { .type = NLA_U32 }, |
521 | [RTA_SRC] = { .type = NLA_U32 }, | |
522 | [RTA_IIF] = { .type = NLA_U32 }, | |
523 | [RTA_OIF] = { .type = NLA_U32 }, | |
524 | [RTA_GATEWAY] = { .type = NLA_U32 }, | |
525 | [RTA_PRIORITY] = { .type = NLA_U32 }, | |
526 | [RTA_PREFSRC] = { .type = NLA_U32 }, | |
527 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
5176f91e | 528 | [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) }, |
4e902c57 | 529 | [RTA_FLOW] = { .type = NLA_U32 }, |
4e902c57 TG |
530 | }; |
531 | ||
4b5d47d4 | 532 | static int rtm_to_fib_config(struct net *net, struct sk_buff *skb, |
6a31d2a9 | 533 | struct nlmsghdr *nlh, struct fib_config *cfg) |
1da177e4 | 534 | { |
4e902c57 TG |
535 | struct nlattr *attr; |
536 | int err, remaining; | |
537 | struct rtmsg *rtm; | |
538 | ||
539 | err = nlmsg_validate(nlh, sizeof(*rtm), RTA_MAX, rtm_ipv4_policy); | |
540 | if (err < 0) | |
541 | goto errout; | |
542 | ||
543 | memset(cfg, 0, sizeof(*cfg)); | |
544 | ||
545 | rtm = nlmsg_data(nlh); | |
4e902c57 | 546 | cfg->fc_dst_len = rtm->rtm_dst_len; |
4e902c57 TG |
547 | cfg->fc_tos = rtm->rtm_tos; |
548 | cfg->fc_table = rtm->rtm_table; | |
549 | cfg->fc_protocol = rtm->rtm_protocol; | |
550 | cfg->fc_scope = rtm->rtm_scope; | |
551 | cfg->fc_type = rtm->rtm_type; | |
552 | cfg->fc_flags = rtm->rtm_flags; | |
553 | cfg->fc_nlflags = nlh->nlmsg_flags; | |
554 | ||
555 | cfg->fc_nlinfo.pid = NETLINK_CB(skb).pid; | |
556 | cfg->fc_nlinfo.nlh = nlh; | |
4b5d47d4 | 557 | cfg->fc_nlinfo.nl_net = net; |
4e902c57 | 558 | |
a0ee18b9 TG |
559 | if (cfg->fc_type > RTN_MAX) { |
560 | err = -EINVAL; | |
561 | goto errout; | |
562 | } | |
563 | ||
4e902c57 | 564 | nlmsg_for_each_attr(attr, nlh, sizeof(struct rtmsg), remaining) { |
8f4c1f9b | 565 | switch (nla_type(attr)) { |
4e902c57 | 566 | case RTA_DST: |
17fb2c64 | 567 | cfg->fc_dst = nla_get_be32(attr); |
4e902c57 | 568 | break; |
4e902c57 TG |
569 | case RTA_OIF: |
570 | cfg->fc_oif = nla_get_u32(attr); | |
571 | break; | |
572 | case RTA_GATEWAY: | |
17fb2c64 | 573 | cfg->fc_gw = nla_get_be32(attr); |
4e902c57 TG |
574 | break; |
575 | case RTA_PRIORITY: | |
576 | cfg->fc_priority = nla_get_u32(attr); | |
577 | break; | |
578 | case RTA_PREFSRC: | |
17fb2c64 | 579 | cfg->fc_prefsrc = nla_get_be32(attr); |
4e902c57 TG |
580 | break; |
581 | case RTA_METRICS: | |
582 | cfg->fc_mx = nla_data(attr); | |
583 | cfg->fc_mx_len = nla_len(attr); | |
584 | break; | |
585 | case RTA_MULTIPATH: | |
586 | cfg->fc_mp = nla_data(attr); | |
587 | cfg->fc_mp_len = nla_len(attr); | |
588 | break; | |
589 | case RTA_FLOW: | |
590 | cfg->fc_flow = nla_get_u32(attr); | |
591 | break; | |
4e902c57 TG |
592 | case RTA_TABLE: |
593 | cfg->fc_table = nla_get_u32(attr); | |
594 | break; | |
1da177e4 LT |
595 | } |
596 | } | |
4e902c57 | 597 | |
1da177e4 | 598 | return 0; |
4e902c57 TG |
599 | errout: |
600 | return err; | |
1da177e4 LT |
601 | } |
602 | ||
6ed2533e | 603 | static int inet_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) |
1da177e4 | 604 | { |
3b1e0a65 | 605 | struct net *net = sock_net(skb->sk); |
4e902c57 TG |
606 | struct fib_config cfg; |
607 | struct fib_table *tb; | |
608 | int err; | |
1da177e4 | 609 | |
4b5d47d4 | 610 | err = rtm_to_fib_config(net, skb, nlh, &cfg); |
4e902c57 TG |
611 | if (err < 0) |
612 | goto errout; | |
1da177e4 | 613 | |
8ad4942c | 614 | tb = fib_get_table(net, cfg.fc_table); |
4e902c57 TG |
615 | if (tb == NULL) { |
616 | err = -ESRCH; | |
617 | goto errout; | |
618 | } | |
619 | ||
16c6cf8b | 620 | err = fib_table_delete(tb, &cfg); |
4e902c57 TG |
621 | errout: |
622 | return err; | |
1da177e4 LT |
623 | } |
624 | ||
6ed2533e | 625 | static int inet_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) |
1da177e4 | 626 | { |
3b1e0a65 | 627 | struct net *net = sock_net(skb->sk); |
4e902c57 TG |
628 | struct fib_config cfg; |
629 | struct fib_table *tb; | |
630 | int err; | |
1da177e4 | 631 | |
4b5d47d4 | 632 | err = rtm_to_fib_config(net, skb, nlh, &cfg); |
4e902c57 TG |
633 | if (err < 0) |
634 | goto errout; | |
1da177e4 | 635 | |
226b0b4a | 636 | tb = fib_new_table(net, cfg.fc_table); |
4e902c57 TG |
637 | if (tb == NULL) { |
638 | err = -ENOBUFS; | |
639 | goto errout; | |
640 | } | |
641 | ||
16c6cf8b | 642 | err = fib_table_insert(tb, &cfg); |
4e902c57 TG |
643 | errout: |
644 | return err; | |
1da177e4 LT |
645 | } |
646 | ||
63f3444f | 647 | static int inet_dump_fib(struct sk_buff *skb, struct netlink_callback *cb) |
1da177e4 | 648 | { |
3b1e0a65 | 649 | struct net *net = sock_net(skb->sk); |
1af5a8c4 PM |
650 | unsigned int h, s_h; |
651 | unsigned int e = 0, s_e; | |
1da177e4 | 652 | struct fib_table *tb; |
1af5a8c4 | 653 | struct hlist_node *node; |
e4aef8ae | 654 | struct hlist_head *head; |
1af5a8c4 | 655 | int dumped = 0; |
1da177e4 | 656 | |
be403ea1 TG |
657 | if (nlmsg_len(cb->nlh) >= sizeof(struct rtmsg) && |
658 | ((struct rtmsg *) nlmsg_data(cb->nlh))->rtm_flags & RTM_F_CLONED) | |
1da177e4 LT |
659 | return ip_rt_dump(skb, cb); |
660 | ||
1af5a8c4 PM |
661 | s_h = cb->args[0]; |
662 | s_e = cb->args[1]; | |
663 | ||
664 | for (h = s_h; h < FIB_TABLE_HASHSZ; h++, s_e = 0) { | |
665 | e = 0; | |
e4aef8ae DL |
666 | head = &net->ipv4.fib_table_hash[h]; |
667 | hlist_for_each_entry(tb, node, head, tb_hlist) { | |
1af5a8c4 PM |
668 | if (e < s_e) |
669 | goto next; | |
670 | if (dumped) | |
671 | memset(&cb->args[2], 0, sizeof(cb->args) - | |
e905a9ed | 672 | 2 * sizeof(cb->args[0])); |
16c6cf8b | 673 | if (fib_table_dump(tb, skb, cb) < 0) |
1af5a8c4 PM |
674 | goto out; |
675 | dumped = 1; | |
676 | next: | |
677 | e++; | |
678 | } | |
1da177e4 | 679 | } |
1af5a8c4 PM |
680 | out: |
681 | cb->args[1] = e; | |
682 | cb->args[0] = h; | |
1da177e4 LT |
683 | |
684 | return skb->len; | |
685 | } | |
686 | ||
687 | /* Prepare and feed intra-kernel routing request. | |
6a31d2a9 ED |
688 | * Really, it should be netlink message, but :-( netlink |
689 | * can be not configured, so that we feed it directly | |
690 | * to fib engine. It is legal, because all events occur | |
691 | * only when netlink is already locked. | |
1da177e4 | 692 | */ |
81f7bf6c | 693 | static void fib_magic(int cmd, int type, __be32 dst, int dst_len, struct in_ifaddr *ifa) |
1da177e4 | 694 | { |
c346dca1 | 695 | struct net *net = dev_net(ifa->ifa_dev->dev); |
4e902c57 TG |
696 | struct fib_table *tb; |
697 | struct fib_config cfg = { | |
698 | .fc_protocol = RTPROT_KERNEL, | |
699 | .fc_type = type, | |
700 | .fc_dst = dst, | |
701 | .fc_dst_len = dst_len, | |
702 | .fc_prefsrc = ifa->ifa_local, | |
703 | .fc_oif = ifa->ifa_dev->dev->ifindex, | |
704 | .fc_nlflags = NLM_F_CREATE | NLM_F_APPEND, | |
4d1169c1 | 705 | .fc_nlinfo = { |
4b5d47d4 | 706 | .nl_net = net, |
4d1169c1 | 707 | }, |
4e902c57 | 708 | }; |
1da177e4 LT |
709 | |
710 | if (type == RTN_UNICAST) | |
4b5d47d4 | 711 | tb = fib_new_table(net, RT_TABLE_MAIN); |
1da177e4 | 712 | else |
4b5d47d4 | 713 | tb = fib_new_table(net, RT_TABLE_LOCAL); |
1da177e4 LT |
714 | |
715 | if (tb == NULL) | |
716 | return; | |
717 | ||
4e902c57 | 718 | cfg.fc_table = tb->tb_id; |
1da177e4 | 719 | |
4e902c57 TG |
720 | if (type != RTN_LOCAL) |
721 | cfg.fc_scope = RT_SCOPE_LINK; | |
722 | else | |
723 | cfg.fc_scope = RT_SCOPE_HOST; | |
1da177e4 LT |
724 | |
725 | if (cmd == RTM_NEWROUTE) | |
16c6cf8b | 726 | fib_table_insert(tb, &cfg); |
1da177e4 | 727 | else |
16c6cf8b | 728 | fib_table_delete(tb, &cfg); |
1da177e4 LT |
729 | } |
730 | ||
0ff60a45 | 731 | void fib_add_ifaddr(struct in_ifaddr *ifa) |
1da177e4 LT |
732 | { |
733 | struct in_device *in_dev = ifa->ifa_dev; | |
734 | struct net_device *dev = in_dev->dev; | |
735 | struct in_ifaddr *prim = ifa; | |
a144ea4b AV |
736 | __be32 mask = ifa->ifa_mask; |
737 | __be32 addr = ifa->ifa_local; | |
6a31d2a9 | 738 | __be32 prefix = ifa->ifa_address & mask; |
1da177e4 | 739 | |
6a31d2a9 | 740 | if (ifa->ifa_flags & IFA_F_SECONDARY) { |
1da177e4 LT |
741 | prim = inet_ifa_byprefix(in_dev, prefix, mask); |
742 | if (prim == NULL) { | |
a6db9010 | 743 | printk(KERN_WARNING "fib_add_ifaddr: bug: prim == NULL\n"); |
1da177e4 LT |
744 | return; |
745 | } | |
746 | } | |
747 | ||
748 | fib_magic(RTM_NEWROUTE, RTN_LOCAL, addr, 32, prim); | |
749 | ||
6a31d2a9 | 750 | if (!(dev->flags & IFF_UP)) |
1da177e4 LT |
751 | return; |
752 | ||
753 | /* Add broadcast address, if it is explicitly assigned. */ | |
a144ea4b | 754 | if (ifa->ifa_broadcast && ifa->ifa_broadcast != htonl(0xFFFFFFFF)) |
1da177e4 LT |
755 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim); |
756 | ||
6a31d2a9 | 757 | if (!ipv4_is_zeronet(prefix) && !(ifa->ifa_flags & IFA_F_SECONDARY) && |
1da177e4 | 758 | (prefix != addr || ifa->ifa_prefixlen < 32)) { |
6a31d2a9 ED |
759 | fib_magic(RTM_NEWROUTE, |
760 | dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST, | |
761 | prefix, ifa->ifa_prefixlen, prim); | |
1da177e4 LT |
762 | |
763 | /* Add network specific broadcasts, when it takes a sense */ | |
764 | if (ifa->ifa_prefixlen < 31) { | |
765 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix, 32, prim); | |
6a31d2a9 ED |
766 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix | ~mask, |
767 | 32, prim); | |
1da177e4 LT |
768 | } |
769 | } | |
770 | } | |
771 | ||
772 | static void fib_del_ifaddr(struct in_ifaddr *ifa) | |
773 | { | |
774 | struct in_device *in_dev = ifa->ifa_dev; | |
775 | struct net_device *dev = in_dev->dev; | |
776 | struct in_ifaddr *ifa1; | |
777 | struct in_ifaddr *prim = ifa; | |
6a31d2a9 ED |
778 | __be32 brd = ifa->ifa_address | ~ifa->ifa_mask; |
779 | __be32 any = ifa->ifa_address & ifa->ifa_mask; | |
1da177e4 LT |
780 | #define LOCAL_OK 1 |
781 | #define BRD_OK 2 | |
782 | #define BRD0_OK 4 | |
783 | #define BRD1_OK 8 | |
784 | unsigned ok = 0; | |
785 | ||
6a31d2a9 ED |
786 | if (!(ifa->ifa_flags & IFA_F_SECONDARY)) |
787 | fib_magic(RTM_DELROUTE, | |
788 | dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST, | |
789 | any, ifa->ifa_prefixlen, prim); | |
1da177e4 LT |
790 | else { |
791 | prim = inet_ifa_byprefix(in_dev, any, ifa->ifa_mask); | |
792 | if (prim == NULL) { | |
a6db9010 | 793 | printk(KERN_WARNING "fib_del_ifaddr: bug: prim == NULL\n"); |
1da177e4 LT |
794 | return; |
795 | } | |
796 | } | |
797 | ||
798 | /* Deletion is more complicated than add. | |
6a31d2a9 ED |
799 | * We should take care of not to delete too much :-) |
800 | * | |
801 | * Scan address list to be sure that addresses are really gone. | |
1da177e4 LT |
802 | */ |
803 | ||
804 | for (ifa1 = in_dev->ifa_list; ifa1; ifa1 = ifa1->ifa_next) { | |
805 | if (ifa->ifa_local == ifa1->ifa_local) | |
806 | ok |= LOCAL_OK; | |
807 | if (ifa->ifa_broadcast == ifa1->ifa_broadcast) | |
808 | ok |= BRD_OK; | |
809 | if (brd == ifa1->ifa_broadcast) | |
810 | ok |= BRD1_OK; | |
811 | if (any == ifa1->ifa_broadcast) | |
812 | ok |= BRD0_OK; | |
813 | } | |
814 | ||
6a31d2a9 | 815 | if (!(ok & BRD_OK)) |
1da177e4 | 816 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim); |
6a31d2a9 | 817 | if (!(ok & BRD1_OK)) |
1da177e4 | 818 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, brd, 32, prim); |
6a31d2a9 | 819 | if (!(ok & BRD0_OK)) |
1da177e4 | 820 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, any, 32, prim); |
6a31d2a9 | 821 | if (!(ok & LOCAL_OK)) { |
1da177e4 LT |
822 | fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 32, prim); |
823 | ||
824 | /* Check, that this local address finally disappeared. */ | |
c346dca1 | 825 | if (inet_addr_type(dev_net(dev), ifa->ifa_local) != RTN_LOCAL) { |
1da177e4 | 826 | /* And the last, but not the least thing. |
6a31d2a9 ED |
827 | * We must flush stray FIB entries. |
828 | * | |
829 | * First of all, we scan fib_info list searching | |
830 | * for stray nexthop entries, then ignite fib_flush. | |
831 | */ | |
c346dca1 YH |
832 | if (fib_sync_down_addr(dev_net(dev), ifa->ifa_local)) |
833 | fib_flush(dev_net(dev)); | |
1da177e4 LT |
834 | } |
835 | } | |
836 | #undef LOCAL_OK | |
837 | #undef BRD_OK | |
838 | #undef BRD0_OK | |
839 | #undef BRD1_OK | |
840 | } | |
841 | ||
6a31d2a9 | 842 | static void nl_fib_lookup(struct fib_result_nl *frn, struct fib_table *tb) |
246955fe | 843 | { |
e905a9ed | 844 | |
246955fe | 845 | struct fib_result res; |
6a31d2a9 ED |
846 | struct flowi fl = { |
847 | .mark = frn->fl_mark, | |
5811662b CG |
848 | .fl4_dst = frn->fl_addr, |
849 | .fl4_tos = frn->fl_tos, | |
850 | .fl4_scope = frn->fl_scope, | |
6a31d2a9 | 851 | }; |
1194ed0a | 852 | |
912a41a4 SV |
853 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
854 | res.r = NULL; | |
855 | #endif | |
856 | ||
1194ed0a | 857 | frn->err = -ENOENT; |
246955fe RO |
858 | if (tb) { |
859 | local_bh_disable(); | |
860 | ||
861 | frn->tb_id = tb->tb_id; | |
ebc0ffae ED |
862 | rcu_read_lock(); |
863 | frn->err = fib_table_lookup(tb, &fl, &res, FIB_LOOKUP_NOREF); | |
246955fe RO |
864 | |
865 | if (!frn->err) { | |
866 | frn->prefixlen = res.prefixlen; | |
867 | frn->nh_sel = res.nh_sel; | |
868 | frn->type = res.type; | |
869 | frn->scope = res.scope; | |
870 | } | |
ebc0ffae | 871 | rcu_read_unlock(); |
246955fe RO |
872 | local_bh_enable(); |
873 | } | |
874 | } | |
875 | ||
28f7b036 | 876 | static void nl_fib_input(struct sk_buff *skb) |
246955fe | 877 | { |
6bd48fcf | 878 | struct net *net; |
246955fe | 879 | struct fib_result_nl *frn; |
28f7b036 | 880 | struct nlmsghdr *nlh; |
246955fe | 881 | struct fib_table *tb; |
28f7b036 | 882 | u32 pid; |
1194ed0a | 883 | |
3b1e0a65 | 884 | net = sock_net(skb->sk); |
b529ccf2 | 885 | nlh = nlmsg_hdr(skb); |
ea86575e | 886 | if (skb->len < NLMSG_SPACE(0) || skb->len < nlh->nlmsg_len || |
d883a036 | 887 | nlh->nlmsg_len < NLMSG_LENGTH(sizeof(*frn))) |
ea86575e | 888 | return; |
d883a036 DL |
889 | |
890 | skb = skb_clone(skb, GFP_KERNEL); | |
891 | if (skb == NULL) | |
892 | return; | |
893 | nlh = nlmsg_hdr(skb); | |
e905a9ed | 894 | |
246955fe | 895 | frn = (struct fib_result_nl *) NLMSG_DATA(nlh); |
6bd48fcf | 896 | tb = fib_get_table(net, frn->tb_id_in); |
246955fe RO |
897 | |
898 | nl_fib_lookup(frn, tb); | |
e905a9ed | 899 | |
6a31d2a9 ED |
900 | pid = NETLINK_CB(skb).pid; /* pid of sending process */ |
901 | NETLINK_CB(skb).pid = 0; /* from kernel */ | |
ac6d439d | 902 | NETLINK_CB(skb).dst_group = 0; /* unicast */ |
6bd48fcf | 903 | netlink_unicast(net->ipv4.fibnl, skb, pid, MSG_DONTWAIT); |
e905a9ed | 904 | } |
246955fe | 905 | |
2c8c1e72 | 906 | static int __net_init nl_fib_lookup_init(struct net *net) |
246955fe | 907 | { |
6bd48fcf DL |
908 | struct sock *sk; |
909 | sk = netlink_kernel_create(net, NETLINK_FIB_LOOKUP, 0, | |
910 | nl_fib_input, NULL, THIS_MODULE); | |
911 | if (sk == NULL) | |
7b1a74fd | 912 | return -EAFNOSUPPORT; |
6bd48fcf | 913 | net->ipv4.fibnl = sk; |
7b1a74fd DL |
914 | return 0; |
915 | } | |
916 | ||
917 | static void nl_fib_lookup_exit(struct net *net) | |
918 | { | |
b7c6ba6e | 919 | netlink_kernel_release(net->ipv4.fibnl); |
775516bf | 920 | net->ipv4.fibnl = NULL; |
246955fe RO |
921 | } |
922 | ||
e2ce1468 | 923 | static void fib_disable_ip(struct net_device *dev, int force, int delay) |
1da177e4 | 924 | { |
85326fa5 | 925 | if (fib_sync_down_dev(dev, force)) |
c346dca1 | 926 | fib_flush(dev_net(dev)); |
e2ce1468 | 927 | rt_cache_flush(dev_net(dev), delay); |
1da177e4 LT |
928 | arp_ifdown(dev); |
929 | } | |
930 | ||
931 | static int fib_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr) | |
932 | { | |
6ed2533e | 933 | struct in_ifaddr *ifa = (struct in_ifaddr *)ptr; |
76e6ebfb | 934 | struct net_device *dev = ifa->ifa_dev->dev; |
1da177e4 LT |
935 | |
936 | switch (event) { | |
937 | case NETDEV_UP: | |
938 | fib_add_ifaddr(ifa); | |
939 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
76e6ebfb | 940 | fib_sync_up(dev); |
1da177e4 | 941 | #endif |
76e6ebfb | 942 | rt_cache_flush(dev_net(dev), -1); |
1da177e4 LT |
943 | break; |
944 | case NETDEV_DOWN: | |
945 | fib_del_ifaddr(ifa); | |
9fcc2e8a | 946 | if (ifa->ifa_dev->ifa_list == NULL) { |
1da177e4 | 947 | /* Last address was deleted from this interface. |
6a31d2a9 | 948 | * Disable IP. |
1da177e4 | 949 | */ |
e2ce1468 | 950 | fib_disable_ip(dev, 1, 0); |
1da177e4 | 951 | } else { |
76e6ebfb | 952 | rt_cache_flush(dev_net(dev), -1); |
1da177e4 LT |
953 | } |
954 | break; | |
955 | } | |
956 | return NOTIFY_DONE; | |
957 | } | |
958 | ||
959 | static int fib_netdev_event(struct notifier_block *this, unsigned long event, void *ptr) | |
960 | { | |
961 | struct net_device *dev = ptr; | |
e5ed6399 | 962 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
1da177e4 LT |
963 | |
964 | if (event == NETDEV_UNREGISTER) { | |
e2ce1468 | 965 | fib_disable_ip(dev, 2, -1); |
1da177e4 LT |
966 | return NOTIFY_DONE; |
967 | } | |
968 | ||
969 | if (!in_dev) | |
970 | return NOTIFY_DONE; | |
971 | ||
972 | switch (event) { | |
973 | case NETDEV_UP: | |
974 | for_ifa(in_dev) { | |
975 | fib_add_ifaddr(ifa); | |
976 | } endfor_ifa(in_dev); | |
977 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
978 | fib_sync_up(dev); | |
979 | #endif | |
76e6ebfb | 980 | rt_cache_flush(dev_net(dev), -1); |
1da177e4 LT |
981 | break; |
982 | case NETDEV_DOWN: | |
e2ce1468 | 983 | fib_disable_ip(dev, 0, 0); |
1da177e4 LT |
984 | break; |
985 | case NETDEV_CHANGEMTU: | |
986 | case NETDEV_CHANGE: | |
76e6ebfb | 987 | rt_cache_flush(dev_net(dev), 0); |
1da177e4 | 988 | break; |
a5ee1551 EB |
989 | case NETDEV_UNREGISTER_BATCH: |
990 | rt_cache_flush_batch(); | |
991 | break; | |
1da177e4 LT |
992 | } |
993 | return NOTIFY_DONE; | |
994 | } | |
995 | ||
996 | static struct notifier_block fib_inetaddr_notifier = { | |
6ed2533e | 997 | .notifier_call = fib_inetaddr_event, |
1da177e4 LT |
998 | }; |
999 | ||
1000 | static struct notifier_block fib_netdev_notifier = { | |
6ed2533e | 1001 | .notifier_call = fib_netdev_event, |
1da177e4 LT |
1002 | }; |
1003 | ||
7b1a74fd | 1004 | static int __net_init ip_fib_net_init(struct net *net) |
1da177e4 | 1005 | { |
dce5cbee | 1006 | int err; |
10da66f7 ED |
1007 | size_t size = sizeof(struct hlist_head) * FIB_TABLE_HASHSZ; |
1008 | ||
1009 | /* Avoid false sharing : Use at least a full cache line */ | |
1010 | size = max_t(size_t, size, L1_CACHE_BYTES); | |
1af5a8c4 | 1011 | |
10da66f7 | 1012 | net->ipv4.fib_table_hash = kzalloc(size, GFP_KERNEL); |
e4aef8ae DL |
1013 | if (net->ipv4.fib_table_hash == NULL) |
1014 | return -ENOMEM; | |
1015 | ||
dce5cbee DL |
1016 | err = fib4_rules_init(net); |
1017 | if (err < 0) | |
1018 | goto fail; | |
1019 | return 0; | |
1020 | ||
1021 | fail: | |
1022 | kfree(net->ipv4.fib_table_hash); | |
1023 | return err; | |
7b1a74fd | 1024 | } |
1da177e4 | 1025 | |
2c8c1e72 | 1026 | static void ip_fib_net_exit(struct net *net) |
7b1a74fd DL |
1027 | { |
1028 | unsigned int i; | |
1029 | ||
1030 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
1031 | fib4_rules_exit(net); | |
1032 | #endif | |
1033 | ||
1034 | for (i = 0; i < FIB_TABLE_HASHSZ; i++) { | |
1035 | struct fib_table *tb; | |
1036 | struct hlist_head *head; | |
1037 | struct hlist_node *node, *tmp; | |
63f3444f | 1038 | |
e4aef8ae | 1039 | head = &net->ipv4.fib_table_hash[i]; |
7b1a74fd DL |
1040 | hlist_for_each_entry_safe(tb, node, tmp, head, tb_hlist) { |
1041 | hlist_del(node); | |
16c6cf8b | 1042 | fib_table_flush(tb); |
4aa2c466 | 1043 | fib_free_table(tb); |
7b1a74fd DL |
1044 | } |
1045 | } | |
e4aef8ae | 1046 | kfree(net->ipv4.fib_table_hash); |
7b1a74fd DL |
1047 | } |
1048 | ||
1049 | static int __net_init fib_net_init(struct net *net) | |
1050 | { | |
1051 | int error; | |
1052 | ||
7b1a74fd DL |
1053 | error = ip_fib_net_init(net); |
1054 | if (error < 0) | |
1055 | goto out; | |
1056 | error = nl_fib_lookup_init(net); | |
1057 | if (error < 0) | |
1058 | goto out_nlfl; | |
1059 | error = fib_proc_init(net); | |
1060 | if (error < 0) | |
1061 | goto out_proc; | |
1062 | out: | |
1063 | return error; | |
1064 | ||
1065 | out_proc: | |
1066 | nl_fib_lookup_exit(net); | |
1067 | out_nlfl: | |
1068 | ip_fib_net_exit(net); | |
1069 | goto out; | |
1070 | } | |
1071 | ||
1072 | static void __net_exit fib_net_exit(struct net *net) | |
1073 | { | |
1074 | fib_proc_exit(net); | |
1075 | nl_fib_lookup_exit(net); | |
1076 | ip_fib_net_exit(net); | |
1077 | } | |
1078 | ||
1079 | static struct pernet_operations fib_net_ops = { | |
1080 | .init = fib_net_init, | |
1081 | .exit = fib_net_exit, | |
1082 | }; | |
1083 | ||
1084 | void __init ip_fib_init(void) | |
1085 | { | |
63f3444f TG |
1086 | rtnl_register(PF_INET, RTM_NEWROUTE, inet_rtm_newroute, NULL); |
1087 | rtnl_register(PF_INET, RTM_DELROUTE, inet_rtm_delroute, NULL); | |
1088 | rtnl_register(PF_INET, RTM_GETROUTE, NULL, inet_dump_fib); | |
7b1a74fd DL |
1089 | |
1090 | register_pernet_subsys(&fib_net_ops); | |
1091 | register_netdevice_notifier(&fib_netdev_notifier); | |
1092 | register_inetaddr_notifier(&fib_inetaddr_notifier); | |
7f9b8052 SH |
1093 | |
1094 | fib_hash_init(); | |
1da177e4 | 1095 | } |