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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 | ||
5348ba85 | 54 | local_table = fib_trie_table(RT_TABLE_LOCAL); |
93456b6d | 55 | if (local_table == NULL) |
dbb50165 DL |
56 | return -ENOMEM; |
57 | ||
5348ba85 | 58 | main_table = fib_trie_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 | 84 | |
5348ba85 | 85 | tb = fib_trie_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 | ||
e4aef8ae | 117 | static void fib_flush(struct net *net) |
1da177e4 LT |
118 | { |
119 | int flushed = 0; | |
1da177e4 | 120 | struct fib_table *tb; |
1af5a8c4 | 121 | struct hlist_node *node; |
e4aef8ae | 122 | struct hlist_head *head; |
1af5a8c4 | 123 | unsigned int h; |
1da177e4 | 124 | |
1af5a8c4 | 125 | for (h = 0; h < FIB_TABLE_HASHSZ; h++) { |
e4aef8ae DL |
126 | head = &net->ipv4.fib_table_hash[h]; |
127 | hlist_for_each_entry(tb, node, head, tb_hlist) | |
16c6cf8b | 128 | flushed += fib_table_flush(tb); |
1da177e4 | 129 | } |
1da177e4 LT |
130 | |
131 | if (flushed) | |
76e6ebfb | 132 | rt_cache_flush(net, -1); |
1da177e4 LT |
133 | } |
134 | ||
05538116 LAT |
135 | /* |
136 | * Find address type as if only "dev" was present in the system. If | |
137 | * on_dev is NULL then all interfaces are taken into consideration. | |
138 | */ | |
6b175b26 EB |
139 | static inline unsigned __inet_dev_addr_type(struct net *net, |
140 | const struct net_device *dev, | |
05538116 | 141 | __be32 addr) |
1da177e4 | 142 | { |
5811662b | 143 | struct flowi fl = { .fl4_dst = addr }; |
1da177e4 LT |
144 | struct fib_result res; |
145 | unsigned ret = RTN_BROADCAST; | |
03cf786c | 146 | struct fib_table *local_table; |
1da177e4 | 147 | |
1e637c74 | 148 | if (ipv4_is_zeronet(addr) || ipv4_is_lbcast(addr)) |
1da177e4 | 149 | return RTN_BROADCAST; |
f97c1e0c | 150 | if (ipv4_is_multicast(addr)) |
1da177e4 LT |
151 | return RTN_MULTICAST; |
152 | ||
153 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
154 | res.r = NULL; | |
155 | #endif | |
e905a9ed | 156 | |
6b175b26 | 157 | local_table = fib_get_table(net, RT_TABLE_LOCAL); |
03cf786c | 158 | if (local_table) { |
1da177e4 | 159 | ret = RTN_UNICAST; |
ebc0ffae ED |
160 | rcu_read_lock(); |
161 | if (!fib_table_lookup(local_table, &fl, &res, FIB_LOOKUP_NOREF)) { | |
05538116 LAT |
162 | if (!dev || dev == res.fi->fib_dev) |
163 | ret = res.type; | |
1da177e4 | 164 | } |
ebc0ffae | 165 | rcu_read_unlock(); |
1da177e4 LT |
166 | } |
167 | return ret; | |
168 | } | |
169 | ||
6b175b26 | 170 | unsigned int inet_addr_type(struct net *net, __be32 addr) |
05538116 | 171 | { |
6b175b26 | 172 | return __inet_dev_addr_type(net, NULL, addr); |
05538116 | 173 | } |
4bc2f18b | 174 | EXPORT_SYMBOL(inet_addr_type); |
05538116 | 175 | |
6b175b26 EB |
176 | unsigned int inet_dev_addr_type(struct net *net, const struct net_device *dev, |
177 | __be32 addr) | |
05538116 | 178 | { |
6a31d2a9 | 179 | return __inet_dev_addr_type(net, dev, addr); |
05538116 | 180 | } |
4bc2f18b | 181 | EXPORT_SYMBOL(inet_dev_addr_type); |
05538116 | 182 | |
1da177e4 | 183 | /* Given (packet source, input interface) and optional (dst, oif, tos): |
6a31d2a9 ED |
184 | * - (main) check, that source is valid i.e. not broadcast or our local |
185 | * address. | |
186 | * - figure out what "logical" interface this packet arrived | |
187 | * and calculate "specific destination" address. | |
188 | * - check, that packet arrived from expected physical interface. | |
ebc0ffae | 189 | * called with rcu_read_lock() |
1da177e4 | 190 | */ |
d9c9df8c | 191 | int fib_validate_source(__be32 src, __be32 dst, u8 tos, int oif, |
b0c110ca | 192 | struct net_device *dev, __be32 *spec_dst, |
193 | u32 *itag, u32 mark) | |
1da177e4 LT |
194 | { |
195 | struct in_device *in_dev; | |
6a31d2a9 | 196 | struct flowi fl = { |
5811662b CG |
197 | .fl4_dst = src, |
198 | .fl4_src = dst, | |
199 | .fl4_tos = tos, | |
6a31d2a9 ED |
200 | .mark = mark, |
201 | .iif = oif | |
202 | }; | |
1da177e4 | 203 | struct fib_result res; |
8153a10c | 204 | int no_addr, rpf, accept_local; |
6f86b325 | 205 | bool dev_match; |
1da177e4 | 206 | int ret; |
5b707aaa | 207 | struct net *net; |
1da177e4 | 208 | |
8153a10c | 209 | no_addr = rpf = accept_local = 0; |
e5ed6399 | 210 | in_dev = __in_dev_get_rcu(dev); |
1da177e4 LT |
211 | if (in_dev) { |
212 | no_addr = in_dev->ifa_list == NULL; | |
213 | rpf = IN_DEV_RPFILTER(in_dev); | |
8153a10c | 214 | accept_local = IN_DEV_ACCEPT_LOCAL(in_dev); |
28f6aeea JHS |
215 | if (mark && !IN_DEV_SRC_VMARK(in_dev)) |
216 | fl.mark = 0; | |
1da177e4 | 217 | } |
1da177e4 LT |
218 | |
219 | if (in_dev == NULL) | |
220 | goto e_inval; | |
221 | ||
c346dca1 | 222 | net = dev_net(dev); |
5b707aaa | 223 | if (fib_lookup(net, &fl, &res)) |
1da177e4 | 224 | goto last_resort; |
8153a10c PM |
225 | if (res.type != RTN_UNICAST) { |
226 | if (res.type != RTN_LOCAL || !accept_local) | |
ebc0ffae | 227 | goto e_inval; |
8153a10c | 228 | } |
1da177e4 LT |
229 | *spec_dst = FIB_RES_PREFSRC(res); |
230 | fib_combine_itag(itag, &res); | |
6f86b325 DM |
231 | dev_match = false; |
232 | ||
1da177e4 | 233 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
6f86b325 DM |
234 | for (ret = 0; ret < res.fi->fib_nhs; ret++) { |
235 | struct fib_nh *nh = &res.fi->fib_nh[ret]; | |
236 | ||
237 | if (nh->nh_dev == dev) { | |
238 | dev_match = true; | |
239 | break; | |
240 | } | |
241 | } | |
1da177e4 LT |
242 | #else |
243 | if (FIB_RES_DEV(res) == dev) | |
6f86b325 | 244 | dev_match = true; |
1da177e4 | 245 | #endif |
6f86b325 | 246 | if (dev_match) { |
1da177e4 | 247 | ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST; |
1da177e4 LT |
248 | return ret; |
249 | } | |
1da177e4 LT |
250 | if (no_addr) |
251 | goto last_resort; | |
c1cf8422 | 252 | if (rpf == 1) |
b5f7e755 | 253 | goto e_rpf; |
1da177e4 LT |
254 | fl.oif = dev->ifindex; |
255 | ||
256 | ret = 0; | |
5b707aaa | 257 | if (fib_lookup(net, &fl, &res) == 0) { |
1da177e4 LT |
258 | if (res.type == RTN_UNICAST) { |
259 | *spec_dst = FIB_RES_PREFSRC(res); | |
260 | ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST; | |
261 | } | |
1da177e4 LT |
262 | } |
263 | return ret; | |
264 | ||
265 | last_resort: | |
266 | if (rpf) | |
b5f7e755 | 267 | goto e_rpf; |
1da177e4 LT |
268 | *spec_dst = inet_select_addr(dev, 0, RT_SCOPE_UNIVERSE); |
269 | *itag = 0; | |
270 | return 0; | |
271 | ||
1da177e4 LT |
272 | e_inval: |
273 | return -EINVAL; | |
b5f7e755 ED |
274 | e_rpf: |
275 | return -EXDEV; | |
1da177e4 LT |
276 | } |
277 | ||
81f7bf6c | 278 | static inline __be32 sk_extract_addr(struct sockaddr *addr) |
4e902c57 TG |
279 | { |
280 | return ((struct sockaddr_in *) addr)->sin_addr.s_addr; | |
281 | } | |
282 | ||
283 | static int put_rtax(struct nlattr *mx, int len, int type, u32 value) | |
284 | { | |
285 | struct nlattr *nla; | |
286 | ||
287 | nla = (struct nlattr *) ((char *) mx + len); | |
288 | nla->nla_type = type; | |
289 | nla->nla_len = nla_attr_size(4); | |
290 | *(u32 *) nla_data(nla) = value; | |
291 | ||
292 | return len + nla_total_size(4); | |
293 | } | |
294 | ||
4b5d47d4 | 295 | static int rtentry_to_fib_config(struct net *net, int cmd, struct rtentry *rt, |
4e902c57 TG |
296 | struct fib_config *cfg) |
297 | { | |
6d85c10a | 298 | __be32 addr; |
4e902c57 TG |
299 | int plen; |
300 | ||
301 | memset(cfg, 0, sizeof(*cfg)); | |
4b5d47d4 | 302 | cfg->fc_nlinfo.nl_net = net; |
4e902c57 TG |
303 | |
304 | if (rt->rt_dst.sa_family != AF_INET) | |
305 | return -EAFNOSUPPORT; | |
306 | ||
307 | /* | |
308 | * Check mask for validity: | |
309 | * a) it must be contiguous. | |
310 | * b) destination must have all host bits clear. | |
311 | * c) if application forgot to set correct family (AF_INET), | |
312 | * reject request unless it is absolutely clear i.e. | |
313 | * both family and mask are zero. | |
314 | */ | |
315 | plen = 32; | |
316 | addr = sk_extract_addr(&rt->rt_dst); | |
317 | if (!(rt->rt_flags & RTF_HOST)) { | |
81f7bf6c | 318 | __be32 mask = sk_extract_addr(&rt->rt_genmask); |
4e902c57 TG |
319 | |
320 | if (rt->rt_genmask.sa_family != AF_INET) { | |
321 | if (mask || rt->rt_genmask.sa_family) | |
322 | return -EAFNOSUPPORT; | |
323 | } | |
324 | ||
325 | if (bad_mask(mask, addr)) | |
326 | return -EINVAL; | |
327 | ||
328 | plen = inet_mask_len(mask); | |
329 | } | |
330 | ||
331 | cfg->fc_dst_len = plen; | |
332 | cfg->fc_dst = addr; | |
333 | ||
334 | if (cmd != SIOCDELRT) { | |
335 | cfg->fc_nlflags = NLM_F_CREATE; | |
336 | cfg->fc_protocol = RTPROT_BOOT; | |
337 | } | |
338 | ||
339 | if (rt->rt_metric) | |
340 | cfg->fc_priority = rt->rt_metric - 1; | |
341 | ||
342 | if (rt->rt_flags & RTF_REJECT) { | |
343 | cfg->fc_scope = RT_SCOPE_HOST; | |
344 | cfg->fc_type = RTN_UNREACHABLE; | |
345 | return 0; | |
346 | } | |
347 | ||
348 | cfg->fc_scope = RT_SCOPE_NOWHERE; | |
349 | cfg->fc_type = RTN_UNICAST; | |
350 | ||
351 | if (rt->rt_dev) { | |
352 | char *colon; | |
353 | struct net_device *dev; | |
354 | char devname[IFNAMSIZ]; | |
355 | ||
356 | if (copy_from_user(devname, rt->rt_dev, IFNAMSIZ-1)) | |
357 | return -EFAULT; | |
358 | ||
359 | devname[IFNAMSIZ-1] = 0; | |
360 | colon = strchr(devname, ':'); | |
361 | if (colon) | |
362 | *colon = 0; | |
4b5d47d4 | 363 | dev = __dev_get_by_name(net, devname); |
4e902c57 TG |
364 | if (!dev) |
365 | return -ENODEV; | |
366 | cfg->fc_oif = dev->ifindex; | |
367 | if (colon) { | |
368 | struct in_ifaddr *ifa; | |
369 | struct in_device *in_dev = __in_dev_get_rtnl(dev); | |
370 | if (!in_dev) | |
371 | return -ENODEV; | |
372 | *colon = ':'; | |
373 | for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) | |
374 | if (strcmp(ifa->ifa_label, devname) == 0) | |
375 | break; | |
376 | if (ifa == NULL) | |
377 | return -ENODEV; | |
378 | cfg->fc_prefsrc = ifa->ifa_local; | |
379 | } | |
380 | } | |
381 | ||
382 | addr = sk_extract_addr(&rt->rt_gateway); | |
383 | if (rt->rt_gateway.sa_family == AF_INET && addr) { | |
384 | cfg->fc_gw = addr; | |
385 | if (rt->rt_flags & RTF_GATEWAY && | |
4b5d47d4 | 386 | inet_addr_type(net, addr) == RTN_UNICAST) |
4e902c57 TG |
387 | cfg->fc_scope = RT_SCOPE_UNIVERSE; |
388 | } | |
389 | ||
390 | if (cmd == SIOCDELRT) | |
391 | return 0; | |
392 | ||
393 | if (rt->rt_flags & RTF_GATEWAY && !cfg->fc_gw) | |
394 | return -EINVAL; | |
395 | ||
396 | if (cfg->fc_scope == RT_SCOPE_NOWHERE) | |
397 | cfg->fc_scope = RT_SCOPE_LINK; | |
398 | ||
399 | if (rt->rt_flags & (RTF_MTU | RTF_WINDOW | RTF_IRTT)) { | |
400 | struct nlattr *mx; | |
401 | int len = 0; | |
402 | ||
403 | mx = kzalloc(3 * nla_total_size(4), GFP_KERNEL); | |
e905a9ed | 404 | if (mx == NULL) |
4e902c57 TG |
405 | return -ENOMEM; |
406 | ||
407 | if (rt->rt_flags & RTF_MTU) | |
408 | len = put_rtax(mx, len, RTAX_ADVMSS, rt->rt_mtu - 40); | |
409 | ||
410 | if (rt->rt_flags & RTF_WINDOW) | |
411 | len = put_rtax(mx, len, RTAX_WINDOW, rt->rt_window); | |
412 | ||
413 | if (rt->rt_flags & RTF_IRTT) | |
414 | len = put_rtax(mx, len, RTAX_RTT, rt->rt_irtt << 3); | |
415 | ||
416 | cfg->fc_mx = mx; | |
417 | cfg->fc_mx_len = len; | |
418 | } | |
419 | ||
420 | return 0; | |
421 | } | |
422 | ||
1da177e4 | 423 | /* |
6a31d2a9 ED |
424 | * Handle IP routing ioctl calls. |
425 | * These are used to manipulate the routing tables | |
1da177e4 | 426 | */ |
1bad118a | 427 | int ip_rt_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
1da177e4 | 428 | { |
4e902c57 TG |
429 | struct fib_config cfg; |
430 | struct rtentry rt; | |
1da177e4 | 431 | int err; |
1da177e4 LT |
432 | |
433 | switch (cmd) { | |
434 | case SIOCADDRT: /* Add a route */ | |
435 | case SIOCDELRT: /* Delete a route */ | |
436 | if (!capable(CAP_NET_ADMIN)) | |
437 | return -EPERM; | |
4e902c57 TG |
438 | |
439 | if (copy_from_user(&rt, arg, sizeof(rt))) | |
1da177e4 | 440 | return -EFAULT; |
4e902c57 | 441 | |
1da177e4 | 442 | rtnl_lock(); |
1bad118a | 443 | err = rtentry_to_fib_config(net, cmd, &rt, &cfg); |
1da177e4 | 444 | if (err == 0) { |
4e902c57 TG |
445 | struct fib_table *tb; |
446 | ||
1da177e4 | 447 | if (cmd == SIOCDELRT) { |
1bad118a | 448 | tb = fib_get_table(net, cfg.fc_table); |
1da177e4 | 449 | if (tb) |
16c6cf8b | 450 | err = fib_table_delete(tb, &cfg); |
4e902c57 TG |
451 | else |
452 | err = -ESRCH; | |
1da177e4 | 453 | } else { |
1bad118a | 454 | tb = fib_new_table(net, cfg.fc_table); |
1da177e4 | 455 | if (tb) |
16c6cf8b | 456 | err = fib_table_insert(tb, &cfg); |
4e902c57 TG |
457 | else |
458 | err = -ENOBUFS; | |
1da177e4 | 459 | } |
4e902c57 TG |
460 | |
461 | /* allocated by rtentry_to_fib_config() */ | |
462 | kfree(cfg.fc_mx); | |
1da177e4 LT |
463 | } |
464 | rtnl_unlock(); | |
465 | return err; | |
466 | } | |
467 | return -EINVAL; | |
468 | } | |
469 | ||
6a31d2a9 | 470 | const struct nla_policy rtm_ipv4_policy[RTA_MAX + 1] = { |
4e902c57 TG |
471 | [RTA_DST] = { .type = NLA_U32 }, |
472 | [RTA_SRC] = { .type = NLA_U32 }, | |
473 | [RTA_IIF] = { .type = NLA_U32 }, | |
474 | [RTA_OIF] = { .type = NLA_U32 }, | |
475 | [RTA_GATEWAY] = { .type = NLA_U32 }, | |
476 | [RTA_PRIORITY] = { .type = NLA_U32 }, | |
477 | [RTA_PREFSRC] = { .type = NLA_U32 }, | |
478 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
5176f91e | 479 | [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) }, |
4e902c57 | 480 | [RTA_FLOW] = { .type = NLA_U32 }, |
4e902c57 TG |
481 | }; |
482 | ||
4b5d47d4 | 483 | static int rtm_to_fib_config(struct net *net, struct sk_buff *skb, |
6a31d2a9 | 484 | struct nlmsghdr *nlh, struct fib_config *cfg) |
1da177e4 | 485 | { |
4e902c57 TG |
486 | struct nlattr *attr; |
487 | int err, remaining; | |
488 | struct rtmsg *rtm; | |
489 | ||
490 | err = nlmsg_validate(nlh, sizeof(*rtm), RTA_MAX, rtm_ipv4_policy); | |
491 | if (err < 0) | |
492 | goto errout; | |
493 | ||
494 | memset(cfg, 0, sizeof(*cfg)); | |
495 | ||
496 | rtm = nlmsg_data(nlh); | |
4e902c57 | 497 | cfg->fc_dst_len = rtm->rtm_dst_len; |
4e902c57 TG |
498 | cfg->fc_tos = rtm->rtm_tos; |
499 | cfg->fc_table = rtm->rtm_table; | |
500 | cfg->fc_protocol = rtm->rtm_protocol; | |
501 | cfg->fc_scope = rtm->rtm_scope; | |
502 | cfg->fc_type = rtm->rtm_type; | |
503 | cfg->fc_flags = rtm->rtm_flags; | |
504 | cfg->fc_nlflags = nlh->nlmsg_flags; | |
505 | ||
506 | cfg->fc_nlinfo.pid = NETLINK_CB(skb).pid; | |
507 | cfg->fc_nlinfo.nlh = nlh; | |
4b5d47d4 | 508 | cfg->fc_nlinfo.nl_net = net; |
4e902c57 | 509 | |
a0ee18b9 TG |
510 | if (cfg->fc_type > RTN_MAX) { |
511 | err = -EINVAL; | |
512 | goto errout; | |
513 | } | |
514 | ||
4e902c57 | 515 | nlmsg_for_each_attr(attr, nlh, sizeof(struct rtmsg), remaining) { |
8f4c1f9b | 516 | switch (nla_type(attr)) { |
4e902c57 | 517 | case RTA_DST: |
17fb2c64 | 518 | cfg->fc_dst = nla_get_be32(attr); |
4e902c57 | 519 | break; |
4e902c57 TG |
520 | case RTA_OIF: |
521 | cfg->fc_oif = nla_get_u32(attr); | |
522 | break; | |
523 | case RTA_GATEWAY: | |
17fb2c64 | 524 | cfg->fc_gw = nla_get_be32(attr); |
4e902c57 TG |
525 | break; |
526 | case RTA_PRIORITY: | |
527 | cfg->fc_priority = nla_get_u32(attr); | |
528 | break; | |
529 | case RTA_PREFSRC: | |
17fb2c64 | 530 | cfg->fc_prefsrc = nla_get_be32(attr); |
4e902c57 TG |
531 | break; |
532 | case RTA_METRICS: | |
533 | cfg->fc_mx = nla_data(attr); | |
534 | cfg->fc_mx_len = nla_len(attr); | |
535 | break; | |
536 | case RTA_MULTIPATH: | |
537 | cfg->fc_mp = nla_data(attr); | |
538 | cfg->fc_mp_len = nla_len(attr); | |
539 | break; | |
540 | case RTA_FLOW: | |
541 | cfg->fc_flow = nla_get_u32(attr); | |
542 | break; | |
4e902c57 TG |
543 | case RTA_TABLE: |
544 | cfg->fc_table = nla_get_u32(attr); | |
545 | break; | |
1da177e4 LT |
546 | } |
547 | } | |
4e902c57 | 548 | |
1da177e4 | 549 | return 0; |
4e902c57 TG |
550 | errout: |
551 | return err; | |
1da177e4 LT |
552 | } |
553 | ||
6ed2533e | 554 | static int inet_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) |
1da177e4 | 555 | { |
3b1e0a65 | 556 | struct net *net = sock_net(skb->sk); |
4e902c57 TG |
557 | struct fib_config cfg; |
558 | struct fib_table *tb; | |
559 | int err; | |
1da177e4 | 560 | |
4b5d47d4 | 561 | err = rtm_to_fib_config(net, skb, nlh, &cfg); |
4e902c57 TG |
562 | if (err < 0) |
563 | goto errout; | |
1da177e4 | 564 | |
8ad4942c | 565 | tb = fib_get_table(net, cfg.fc_table); |
4e902c57 TG |
566 | if (tb == NULL) { |
567 | err = -ESRCH; | |
568 | goto errout; | |
569 | } | |
570 | ||
16c6cf8b | 571 | err = fib_table_delete(tb, &cfg); |
4e902c57 TG |
572 | errout: |
573 | return err; | |
1da177e4 LT |
574 | } |
575 | ||
6ed2533e | 576 | static int inet_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) |
1da177e4 | 577 | { |
3b1e0a65 | 578 | struct net *net = sock_net(skb->sk); |
4e902c57 TG |
579 | struct fib_config cfg; |
580 | struct fib_table *tb; | |
581 | int err; | |
1da177e4 | 582 | |
4b5d47d4 | 583 | err = rtm_to_fib_config(net, skb, nlh, &cfg); |
4e902c57 TG |
584 | if (err < 0) |
585 | goto errout; | |
1da177e4 | 586 | |
226b0b4a | 587 | tb = fib_new_table(net, cfg.fc_table); |
4e902c57 TG |
588 | if (tb == NULL) { |
589 | err = -ENOBUFS; | |
590 | goto errout; | |
591 | } | |
592 | ||
16c6cf8b | 593 | err = fib_table_insert(tb, &cfg); |
4e902c57 TG |
594 | errout: |
595 | return err; | |
1da177e4 LT |
596 | } |
597 | ||
63f3444f | 598 | static int inet_dump_fib(struct sk_buff *skb, struct netlink_callback *cb) |
1da177e4 | 599 | { |
3b1e0a65 | 600 | struct net *net = sock_net(skb->sk); |
1af5a8c4 PM |
601 | unsigned int h, s_h; |
602 | unsigned int e = 0, s_e; | |
1da177e4 | 603 | struct fib_table *tb; |
1af5a8c4 | 604 | struct hlist_node *node; |
e4aef8ae | 605 | struct hlist_head *head; |
1af5a8c4 | 606 | int dumped = 0; |
1da177e4 | 607 | |
be403ea1 TG |
608 | if (nlmsg_len(cb->nlh) >= sizeof(struct rtmsg) && |
609 | ((struct rtmsg *) nlmsg_data(cb->nlh))->rtm_flags & RTM_F_CLONED) | |
1da177e4 LT |
610 | return ip_rt_dump(skb, cb); |
611 | ||
1af5a8c4 PM |
612 | s_h = cb->args[0]; |
613 | s_e = cb->args[1]; | |
614 | ||
615 | for (h = s_h; h < FIB_TABLE_HASHSZ; h++, s_e = 0) { | |
616 | e = 0; | |
e4aef8ae DL |
617 | head = &net->ipv4.fib_table_hash[h]; |
618 | hlist_for_each_entry(tb, node, head, tb_hlist) { | |
1af5a8c4 PM |
619 | if (e < s_e) |
620 | goto next; | |
621 | if (dumped) | |
622 | memset(&cb->args[2], 0, sizeof(cb->args) - | |
e905a9ed | 623 | 2 * sizeof(cb->args[0])); |
16c6cf8b | 624 | if (fib_table_dump(tb, skb, cb) < 0) |
1af5a8c4 PM |
625 | goto out; |
626 | dumped = 1; | |
627 | next: | |
628 | e++; | |
629 | } | |
1da177e4 | 630 | } |
1af5a8c4 PM |
631 | out: |
632 | cb->args[1] = e; | |
633 | cb->args[0] = h; | |
1da177e4 LT |
634 | |
635 | return skb->len; | |
636 | } | |
637 | ||
638 | /* Prepare and feed intra-kernel routing request. | |
6a31d2a9 ED |
639 | * Really, it should be netlink message, but :-( netlink |
640 | * can be not configured, so that we feed it directly | |
641 | * to fib engine. It is legal, because all events occur | |
642 | * only when netlink is already locked. | |
1da177e4 | 643 | */ |
81f7bf6c | 644 | static void fib_magic(int cmd, int type, __be32 dst, int dst_len, struct in_ifaddr *ifa) |
1da177e4 | 645 | { |
c346dca1 | 646 | struct net *net = dev_net(ifa->ifa_dev->dev); |
4e902c57 TG |
647 | struct fib_table *tb; |
648 | struct fib_config cfg = { | |
649 | .fc_protocol = RTPROT_KERNEL, | |
650 | .fc_type = type, | |
651 | .fc_dst = dst, | |
652 | .fc_dst_len = dst_len, | |
653 | .fc_prefsrc = ifa->ifa_local, | |
654 | .fc_oif = ifa->ifa_dev->dev->ifindex, | |
655 | .fc_nlflags = NLM_F_CREATE | NLM_F_APPEND, | |
4d1169c1 | 656 | .fc_nlinfo = { |
4b5d47d4 | 657 | .nl_net = net, |
4d1169c1 | 658 | }, |
4e902c57 | 659 | }; |
1da177e4 LT |
660 | |
661 | if (type == RTN_UNICAST) | |
4b5d47d4 | 662 | tb = fib_new_table(net, RT_TABLE_MAIN); |
1da177e4 | 663 | else |
4b5d47d4 | 664 | tb = fib_new_table(net, RT_TABLE_LOCAL); |
1da177e4 LT |
665 | |
666 | if (tb == NULL) | |
667 | return; | |
668 | ||
4e902c57 | 669 | cfg.fc_table = tb->tb_id; |
1da177e4 | 670 | |
4e902c57 TG |
671 | if (type != RTN_LOCAL) |
672 | cfg.fc_scope = RT_SCOPE_LINK; | |
673 | else | |
674 | cfg.fc_scope = RT_SCOPE_HOST; | |
1da177e4 LT |
675 | |
676 | if (cmd == RTM_NEWROUTE) | |
16c6cf8b | 677 | fib_table_insert(tb, &cfg); |
1da177e4 | 678 | else |
16c6cf8b | 679 | fib_table_delete(tb, &cfg); |
1da177e4 LT |
680 | } |
681 | ||
0ff60a45 | 682 | void fib_add_ifaddr(struct in_ifaddr *ifa) |
1da177e4 LT |
683 | { |
684 | struct in_device *in_dev = ifa->ifa_dev; | |
685 | struct net_device *dev = in_dev->dev; | |
686 | struct in_ifaddr *prim = ifa; | |
a144ea4b AV |
687 | __be32 mask = ifa->ifa_mask; |
688 | __be32 addr = ifa->ifa_local; | |
6a31d2a9 | 689 | __be32 prefix = ifa->ifa_address & mask; |
1da177e4 | 690 | |
6a31d2a9 | 691 | if (ifa->ifa_flags & IFA_F_SECONDARY) { |
1da177e4 LT |
692 | prim = inet_ifa_byprefix(in_dev, prefix, mask); |
693 | if (prim == NULL) { | |
a6db9010 | 694 | printk(KERN_WARNING "fib_add_ifaddr: bug: prim == NULL\n"); |
1da177e4 LT |
695 | return; |
696 | } | |
697 | } | |
698 | ||
699 | fib_magic(RTM_NEWROUTE, RTN_LOCAL, addr, 32, prim); | |
700 | ||
6a31d2a9 | 701 | if (!(dev->flags & IFF_UP)) |
1da177e4 LT |
702 | return; |
703 | ||
704 | /* Add broadcast address, if it is explicitly assigned. */ | |
a144ea4b | 705 | if (ifa->ifa_broadcast && ifa->ifa_broadcast != htonl(0xFFFFFFFF)) |
1da177e4 LT |
706 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim); |
707 | ||
6a31d2a9 | 708 | if (!ipv4_is_zeronet(prefix) && !(ifa->ifa_flags & IFA_F_SECONDARY) && |
1da177e4 | 709 | (prefix != addr || ifa->ifa_prefixlen < 32)) { |
6a31d2a9 ED |
710 | fib_magic(RTM_NEWROUTE, |
711 | dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST, | |
712 | prefix, ifa->ifa_prefixlen, prim); | |
1da177e4 LT |
713 | |
714 | /* Add network specific broadcasts, when it takes a sense */ | |
715 | if (ifa->ifa_prefixlen < 31) { | |
716 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix, 32, prim); | |
6a31d2a9 ED |
717 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix | ~mask, |
718 | 32, prim); | |
1da177e4 LT |
719 | } |
720 | } | |
721 | } | |
722 | ||
723 | static void fib_del_ifaddr(struct in_ifaddr *ifa) | |
724 | { | |
725 | struct in_device *in_dev = ifa->ifa_dev; | |
726 | struct net_device *dev = in_dev->dev; | |
727 | struct in_ifaddr *ifa1; | |
728 | struct in_ifaddr *prim = ifa; | |
6a31d2a9 ED |
729 | __be32 brd = ifa->ifa_address | ~ifa->ifa_mask; |
730 | __be32 any = ifa->ifa_address & ifa->ifa_mask; | |
1da177e4 LT |
731 | #define LOCAL_OK 1 |
732 | #define BRD_OK 2 | |
733 | #define BRD0_OK 4 | |
734 | #define BRD1_OK 8 | |
735 | unsigned ok = 0; | |
736 | ||
6a31d2a9 ED |
737 | if (!(ifa->ifa_flags & IFA_F_SECONDARY)) |
738 | fib_magic(RTM_DELROUTE, | |
739 | dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST, | |
740 | any, ifa->ifa_prefixlen, prim); | |
1da177e4 LT |
741 | else { |
742 | prim = inet_ifa_byprefix(in_dev, any, ifa->ifa_mask); | |
743 | if (prim == NULL) { | |
a6db9010 | 744 | printk(KERN_WARNING "fib_del_ifaddr: bug: prim == NULL\n"); |
1da177e4 LT |
745 | return; |
746 | } | |
747 | } | |
748 | ||
749 | /* Deletion is more complicated than add. | |
6a31d2a9 ED |
750 | * We should take care of not to delete too much :-) |
751 | * | |
752 | * Scan address list to be sure that addresses are really gone. | |
1da177e4 LT |
753 | */ |
754 | ||
755 | for (ifa1 = in_dev->ifa_list; ifa1; ifa1 = ifa1->ifa_next) { | |
756 | if (ifa->ifa_local == ifa1->ifa_local) | |
757 | ok |= LOCAL_OK; | |
758 | if (ifa->ifa_broadcast == ifa1->ifa_broadcast) | |
759 | ok |= BRD_OK; | |
760 | if (brd == ifa1->ifa_broadcast) | |
761 | ok |= BRD1_OK; | |
762 | if (any == ifa1->ifa_broadcast) | |
763 | ok |= BRD0_OK; | |
764 | } | |
765 | ||
6a31d2a9 | 766 | if (!(ok & BRD_OK)) |
1da177e4 | 767 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim); |
6a31d2a9 | 768 | if (!(ok & BRD1_OK)) |
1da177e4 | 769 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, brd, 32, prim); |
6a31d2a9 | 770 | if (!(ok & BRD0_OK)) |
1da177e4 | 771 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, any, 32, prim); |
6a31d2a9 | 772 | if (!(ok & LOCAL_OK)) { |
1da177e4 LT |
773 | fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 32, prim); |
774 | ||
775 | /* Check, that this local address finally disappeared. */ | |
c346dca1 | 776 | if (inet_addr_type(dev_net(dev), ifa->ifa_local) != RTN_LOCAL) { |
1da177e4 | 777 | /* And the last, but not the least thing. |
6a31d2a9 ED |
778 | * We must flush stray FIB entries. |
779 | * | |
780 | * First of all, we scan fib_info list searching | |
781 | * for stray nexthop entries, then ignite fib_flush. | |
782 | */ | |
c346dca1 YH |
783 | if (fib_sync_down_addr(dev_net(dev), ifa->ifa_local)) |
784 | fib_flush(dev_net(dev)); | |
1da177e4 LT |
785 | } |
786 | } | |
787 | #undef LOCAL_OK | |
788 | #undef BRD_OK | |
789 | #undef BRD0_OK | |
790 | #undef BRD1_OK | |
791 | } | |
792 | ||
6a31d2a9 | 793 | static void nl_fib_lookup(struct fib_result_nl *frn, struct fib_table *tb) |
246955fe | 794 | { |
e905a9ed | 795 | |
246955fe | 796 | struct fib_result res; |
6a31d2a9 ED |
797 | struct flowi fl = { |
798 | .mark = frn->fl_mark, | |
5811662b CG |
799 | .fl4_dst = frn->fl_addr, |
800 | .fl4_tos = frn->fl_tos, | |
801 | .fl4_scope = frn->fl_scope, | |
6a31d2a9 | 802 | }; |
1194ed0a | 803 | |
912a41a4 SV |
804 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
805 | res.r = NULL; | |
806 | #endif | |
807 | ||
1194ed0a | 808 | frn->err = -ENOENT; |
246955fe RO |
809 | if (tb) { |
810 | local_bh_disable(); | |
811 | ||
812 | frn->tb_id = tb->tb_id; | |
ebc0ffae ED |
813 | rcu_read_lock(); |
814 | frn->err = fib_table_lookup(tb, &fl, &res, FIB_LOOKUP_NOREF); | |
246955fe RO |
815 | |
816 | if (!frn->err) { | |
817 | frn->prefixlen = res.prefixlen; | |
818 | frn->nh_sel = res.nh_sel; | |
819 | frn->type = res.type; | |
820 | frn->scope = res.scope; | |
821 | } | |
ebc0ffae | 822 | rcu_read_unlock(); |
246955fe RO |
823 | local_bh_enable(); |
824 | } | |
825 | } | |
826 | ||
28f7b036 | 827 | static void nl_fib_input(struct sk_buff *skb) |
246955fe | 828 | { |
6bd48fcf | 829 | struct net *net; |
246955fe | 830 | struct fib_result_nl *frn; |
28f7b036 | 831 | struct nlmsghdr *nlh; |
246955fe | 832 | struct fib_table *tb; |
28f7b036 | 833 | u32 pid; |
1194ed0a | 834 | |
3b1e0a65 | 835 | net = sock_net(skb->sk); |
b529ccf2 | 836 | nlh = nlmsg_hdr(skb); |
ea86575e | 837 | if (skb->len < NLMSG_SPACE(0) || skb->len < nlh->nlmsg_len || |
d883a036 | 838 | nlh->nlmsg_len < NLMSG_LENGTH(sizeof(*frn))) |
ea86575e | 839 | return; |
d883a036 DL |
840 | |
841 | skb = skb_clone(skb, GFP_KERNEL); | |
842 | if (skb == NULL) | |
843 | return; | |
844 | nlh = nlmsg_hdr(skb); | |
e905a9ed | 845 | |
246955fe | 846 | frn = (struct fib_result_nl *) NLMSG_DATA(nlh); |
6bd48fcf | 847 | tb = fib_get_table(net, frn->tb_id_in); |
246955fe RO |
848 | |
849 | nl_fib_lookup(frn, tb); | |
e905a9ed | 850 | |
6a31d2a9 ED |
851 | pid = NETLINK_CB(skb).pid; /* pid of sending process */ |
852 | NETLINK_CB(skb).pid = 0; /* from kernel */ | |
ac6d439d | 853 | NETLINK_CB(skb).dst_group = 0; /* unicast */ |
6bd48fcf | 854 | netlink_unicast(net->ipv4.fibnl, skb, pid, MSG_DONTWAIT); |
e905a9ed | 855 | } |
246955fe | 856 | |
2c8c1e72 | 857 | static int __net_init nl_fib_lookup_init(struct net *net) |
246955fe | 858 | { |
6bd48fcf DL |
859 | struct sock *sk; |
860 | sk = netlink_kernel_create(net, NETLINK_FIB_LOOKUP, 0, | |
861 | nl_fib_input, NULL, THIS_MODULE); | |
862 | if (sk == NULL) | |
7b1a74fd | 863 | return -EAFNOSUPPORT; |
6bd48fcf | 864 | net->ipv4.fibnl = sk; |
7b1a74fd DL |
865 | return 0; |
866 | } | |
867 | ||
868 | static void nl_fib_lookup_exit(struct net *net) | |
869 | { | |
b7c6ba6e | 870 | netlink_kernel_release(net->ipv4.fibnl); |
775516bf | 871 | net->ipv4.fibnl = NULL; |
246955fe RO |
872 | } |
873 | ||
e2ce1468 | 874 | static void fib_disable_ip(struct net_device *dev, int force, int delay) |
1da177e4 | 875 | { |
85326fa5 | 876 | if (fib_sync_down_dev(dev, force)) |
c346dca1 | 877 | fib_flush(dev_net(dev)); |
e2ce1468 | 878 | rt_cache_flush(dev_net(dev), delay); |
1da177e4 LT |
879 | arp_ifdown(dev); |
880 | } | |
881 | ||
882 | static int fib_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr) | |
883 | { | |
6ed2533e | 884 | struct in_ifaddr *ifa = (struct in_ifaddr *)ptr; |
76e6ebfb | 885 | struct net_device *dev = ifa->ifa_dev->dev; |
1da177e4 LT |
886 | |
887 | switch (event) { | |
888 | case NETDEV_UP: | |
889 | fib_add_ifaddr(ifa); | |
890 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
76e6ebfb | 891 | fib_sync_up(dev); |
1da177e4 | 892 | #endif |
1fc050a1 | 893 | fib_update_nh_saddrs(dev); |
76e6ebfb | 894 | rt_cache_flush(dev_net(dev), -1); |
1da177e4 LT |
895 | break; |
896 | case NETDEV_DOWN: | |
897 | fib_del_ifaddr(ifa); | |
1fc050a1 | 898 | fib_update_nh_saddrs(dev); |
9fcc2e8a | 899 | if (ifa->ifa_dev->ifa_list == NULL) { |
1da177e4 | 900 | /* Last address was deleted from this interface. |
6a31d2a9 | 901 | * Disable IP. |
1da177e4 | 902 | */ |
e2ce1468 | 903 | fib_disable_ip(dev, 1, 0); |
1da177e4 | 904 | } else { |
76e6ebfb | 905 | rt_cache_flush(dev_net(dev), -1); |
1da177e4 LT |
906 | } |
907 | break; | |
908 | } | |
909 | return NOTIFY_DONE; | |
910 | } | |
911 | ||
912 | static int fib_netdev_event(struct notifier_block *this, unsigned long event, void *ptr) | |
913 | { | |
914 | struct net_device *dev = ptr; | |
e5ed6399 | 915 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
1da177e4 LT |
916 | |
917 | if (event == NETDEV_UNREGISTER) { | |
e2ce1468 | 918 | fib_disable_ip(dev, 2, -1); |
1da177e4 LT |
919 | return NOTIFY_DONE; |
920 | } | |
921 | ||
922 | if (!in_dev) | |
923 | return NOTIFY_DONE; | |
924 | ||
925 | switch (event) { | |
926 | case NETDEV_UP: | |
927 | for_ifa(in_dev) { | |
928 | fib_add_ifaddr(ifa); | |
929 | } endfor_ifa(in_dev); | |
930 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
931 | fib_sync_up(dev); | |
932 | #endif | |
76e6ebfb | 933 | rt_cache_flush(dev_net(dev), -1); |
1da177e4 LT |
934 | break; |
935 | case NETDEV_DOWN: | |
e2ce1468 | 936 | fib_disable_ip(dev, 0, 0); |
1da177e4 LT |
937 | break; |
938 | case NETDEV_CHANGEMTU: | |
939 | case NETDEV_CHANGE: | |
76e6ebfb | 940 | rt_cache_flush(dev_net(dev), 0); |
1da177e4 | 941 | break; |
a5ee1551 | 942 | case NETDEV_UNREGISTER_BATCH: |
6561a3b1 DM |
943 | /* The batch unregister is only called on the first |
944 | * device in the list of devices being unregistered. | |
945 | * Therefore we should not pass dev_net(dev) in here. | |
946 | */ | |
947 | rt_cache_flush_batch(NULL); | |
a5ee1551 | 948 | break; |
1da177e4 LT |
949 | } |
950 | return NOTIFY_DONE; | |
951 | } | |
952 | ||
953 | static struct notifier_block fib_inetaddr_notifier = { | |
6ed2533e | 954 | .notifier_call = fib_inetaddr_event, |
1da177e4 LT |
955 | }; |
956 | ||
957 | static struct notifier_block fib_netdev_notifier = { | |
6ed2533e | 958 | .notifier_call = fib_netdev_event, |
1da177e4 LT |
959 | }; |
960 | ||
7b1a74fd | 961 | static int __net_init ip_fib_net_init(struct net *net) |
1da177e4 | 962 | { |
dce5cbee | 963 | int err; |
10da66f7 ED |
964 | size_t size = sizeof(struct hlist_head) * FIB_TABLE_HASHSZ; |
965 | ||
966 | /* Avoid false sharing : Use at least a full cache line */ | |
967 | size = max_t(size_t, size, L1_CACHE_BYTES); | |
1af5a8c4 | 968 | |
10da66f7 | 969 | net->ipv4.fib_table_hash = kzalloc(size, GFP_KERNEL); |
e4aef8ae DL |
970 | if (net->ipv4.fib_table_hash == NULL) |
971 | return -ENOMEM; | |
972 | ||
dce5cbee DL |
973 | err = fib4_rules_init(net); |
974 | if (err < 0) | |
975 | goto fail; | |
976 | return 0; | |
977 | ||
978 | fail: | |
979 | kfree(net->ipv4.fib_table_hash); | |
980 | return err; | |
7b1a74fd | 981 | } |
1da177e4 | 982 | |
2c8c1e72 | 983 | static void ip_fib_net_exit(struct net *net) |
7b1a74fd DL |
984 | { |
985 | unsigned int i; | |
986 | ||
987 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
988 | fib4_rules_exit(net); | |
989 | #endif | |
990 | ||
991 | for (i = 0; i < FIB_TABLE_HASHSZ; i++) { | |
992 | struct fib_table *tb; | |
993 | struct hlist_head *head; | |
994 | struct hlist_node *node, *tmp; | |
63f3444f | 995 | |
e4aef8ae | 996 | head = &net->ipv4.fib_table_hash[i]; |
7b1a74fd DL |
997 | hlist_for_each_entry_safe(tb, node, tmp, head, tb_hlist) { |
998 | hlist_del(node); | |
16c6cf8b | 999 | fib_table_flush(tb); |
4aa2c466 | 1000 | fib_free_table(tb); |
7b1a74fd DL |
1001 | } |
1002 | } | |
e4aef8ae | 1003 | kfree(net->ipv4.fib_table_hash); |
7b1a74fd DL |
1004 | } |
1005 | ||
1006 | static int __net_init fib_net_init(struct net *net) | |
1007 | { | |
1008 | int error; | |
1009 | ||
7b1a74fd DL |
1010 | error = ip_fib_net_init(net); |
1011 | if (error < 0) | |
1012 | goto out; | |
1013 | error = nl_fib_lookup_init(net); | |
1014 | if (error < 0) | |
1015 | goto out_nlfl; | |
1016 | error = fib_proc_init(net); | |
1017 | if (error < 0) | |
1018 | goto out_proc; | |
1019 | out: | |
1020 | return error; | |
1021 | ||
1022 | out_proc: | |
1023 | nl_fib_lookup_exit(net); | |
1024 | out_nlfl: | |
1025 | ip_fib_net_exit(net); | |
1026 | goto out; | |
1027 | } | |
1028 | ||
1029 | static void __net_exit fib_net_exit(struct net *net) | |
1030 | { | |
1031 | fib_proc_exit(net); | |
1032 | nl_fib_lookup_exit(net); | |
1033 | ip_fib_net_exit(net); | |
1034 | } | |
1035 | ||
1036 | static struct pernet_operations fib_net_ops = { | |
1037 | .init = fib_net_init, | |
1038 | .exit = fib_net_exit, | |
1039 | }; | |
1040 | ||
1041 | void __init ip_fib_init(void) | |
1042 | { | |
63f3444f TG |
1043 | rtnl_register(PF_INET, RTM_NEWROUTE, inet_rtm_newroute, NULL); |
1044 | rtnl_register(PF_INET, RTM_DELROUTE, inet_rtm_delroute, NULL); | |
1045 | rtnl_register(PF_INET, RTM_GETROUTE, NULL, inet_dump_fib); | |
7b1a74fd DL |
1046 | |
1047 | register_pernet_subsys(&fib_net_ops); | |
1048 | register_netdevice_notifier(&fib_netdev_notifier); | |
1049 | register_inetaddr_notifier(&fib_inetaddr_notifier); | |
7f9b8052 | 1050 | |
5348ba85 | 1051 | fib_trie_init(); |
1da177e4 | 1052 | } |