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> | |
1da177e4 | 18 | #include <linux/bitops.h> |
4fc268d2 | 19 | #include <linux/capability.h> |
1da177e4 LT |
20 | #include <linux/types.h> |
21 | #include <linux/kernel.h> | |
1da177e4 LT |
22 | #include <linux/mm.h> |
23 | #include <linux/string.h> | |
24 | #include <linux/socket.h> | |
25 | #include <linux/sockios.h> | |
26 | #include <linux/errno.h> | |
27 | #include <linux/in.h> | |
28 | #include <linux/inet.h> | |
14c85021 | 29 | #include <linux/inetdevice.h> |
1da177e4 | 30 | #include <linux/netdevice.h> |
1823730f | 31 | #include <linux/if_addr.h> |
1da177e4 LT |
32 | #include <linux/if_arp.h> |
33 | #include <linux/skbuff.h> | |
7a9bc9b8 | 34 | #include <linux/cache.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> |
990078af | 47 | #include <net/xfrm.h> |
1da177e4 | 48 | |
1da177e4 LT |
49 | #ifndef CONFIG_IP_MULTIPLE_TABLES |
50 | ||
7b1a74fd | 51 | static int __net_init fib4_rules_init(struct net *net) |
c3e9a353 | 52 | { |
93456b6d DL |
53 | struct fib_table *local_table, *main_table; |
54 | ||
0ddcf43d | 55 | main_table = fib_trie_table(RT_TABLE_MAIN, NULL); |
51456b29 | 56 | if (!main_table) |
61f0d861 | 57 | return -ENOMEM; |
dbb50165 | 58 | |
0ddcf43d | 59 | local_table = fib_trie_table(RT_TABLE_LOCAL, main_table); |
51456b29 | 60 | if (!local_table) |
61f0d861 | 61 | goto fail; |
0ddcf43d | 62 | |
93456b6d | 63 | hlist_add_head_rcu(&local_table->tb_hlist, |
e4aef8ae | 64 | &net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX]); |
93456b6d | 65 | hlist_add_head_rcu(&main_table->tb_hlist, |
e4aef8ae | 66 | &net->ipv4.fib_table_hash[TABLE_MAIN_INDEX]); |
dbb50165 DL |
67 | return 0; |
68 | ||
69 | fail: | |
61f0d861 | 70 | fib_free_table(main_table); |
dbb50165 | 71 | return -ENOMEM; |
c3e9a353 | 72 | } |
1af5a8c4 | 73 | #else |
1da177e4 | 74 | |
8ad4942c | 75 | struct fib_table *fib_new_table(struct net *net, u32 id) |
1da177e4 | 76 | { |
0ddcf43d | 77 | struct fib_table *tb, *alias = NULL; |
1af5a8c4 | 78 | unsigned int h; |
1da177e4 | 79 | |
1af5a8c4 PM |
80 | if (id == 0) |
81 | id = RT_TABLE_MAIN; | |
8ad4942c | 82 | tb = fib_get_table(net, id); |
1af5a8c4 PM |
83 | if (tb) |
84 | return tb; | |
7f9b8052 | 85 | |
0ddcf43d AD |
86 | if (id == RT_TABLE_LOCAL) |
87 | alias = fib_new_table(net, RT_TABLE_MAIN); | |
88 | ||
89 | tb = fib_trie_table(id, alias); | |
1da177e4 LT |
90 | if (!tb) |
91 | return NULL; | |
f4530fa5 DM |
92 | |
93 | switch (id) { | |
94 | case RT_TABLE_LOCAL: | |
a7e53531 | 95 | rcu_assign_pointer(net->ipv4.fib_local, tb); |
f4530fa5 | 96 | break; |
f4530fa5 | 97 | case RT_TABLE_MAIN: |
a7e53531 | 98 | rcu_assign_pointer(net->ipv4.fib_main, tb); |
f4530fa5 | 99 | break; |
f4530fa5 | 100 | case RT_TABLE_DEFAULT: |
a7e53531 | 101 | rcu_assign_pointer(net->ipv4.fib_default, tb); |
f4530fa5 | 102 | break; |
f4530fa5 DM |
103 | default: |
104 | break; | |
105 | } | |
106 | ||
1af5a8c4 | 107 | h = id & (FIB_TABLE_HASHSZ - 1); |
e4aef8ae | 108 | hlist_add_head_rcu(&tb->tb_hlist, &net->ipv4.fib_table_hash[h]); |
1da177e4 LT |
109 | return tb; |
110 | } | |
111 | ||
345e9b54 | 112 | /* caller must hold either rtnl or rcu read lock */ |
8ad4942c | 113 | struct fib_table *fib_get_table(struct net *net, u32 id) |
1af5a8c4 PM |
114 | { |
115 | struct fib_table *tb; | |
e4aef8ae | 116 | struct hlist_head *head; |
1af5a8c4 | 117 | unsigned int h; |
1da177e4 | 118 | |
1af5a8c4 PM |
119 | if (id == 0) |
120 | id = RT_TABLE_MAIN; | |
121 | h = id & (FIB_TABLE_HASHSZ - 1); | |
e4aef8ae | 122 | |
e4aef8ae | 123 | head = &net->ipv4.fib_table_hash[h]; |
b67bfe0d | 124 | hlist_for_each_entry_rcu(tb, head, tb_hlist) { |
345e9b54 | 125 | if (tb->tb_id == id) |
1af5a8c4 | 126 | return tb; |
1af5a8c4 | 127 | } |
1af5a8c4 PM |
128 | return NULL; |
129 | } | |
1da177e4 LT |
130 | #endif /* CONFIG_IP_MULTIPLE_TABLES */ |
131 | ||
0ddcf43d AD |
132 | static void fib_replace_table(struct net *net, struct fib_table *old, |
133 | struct fib_table *new) | |
134 | { | |
135 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
136 | switch (new->tb_id) { | |
137 | case RT_TABLE_LOCAL: | |
138 | rcu_assign_pointer(net->ipv4.fib_local, new); | |
139 | break; | |
140 | case RT_TABLE_MAIN: | |
141 | rcu_assign_pointer(net->ipv4.fib_main, new); | |
142 | break; | |
143 | case RT_TABLE_DEFAULT: | |
144 | rcu_assign_pointer(net->ipv4.fib_default, new); | |
145 | break; | |
146 | default: | |
147 | break; | |
148 | } | |
149 | ||
150 | #endif | |
151 | /* replace the old table in the hlist */ | |
152 | hlist_replace_rcu(&old->tb_hlist, &new->tb_hlist); | |
153 | } | |
154 | ||
155 | int fib_unmerge(struct net *net) | |
156 | { | |
157 | struct fib_table *old, *new; | |
158 | ||
3c9e9f73 | 159 | /* attempt to fetch local table if it has been allocated */ |
0ddcf43d | 160 | old = fib_get_table(net, RT_TABLE_LOCAL); |
3c9e9f73 AD |
161 | if (!old) |
162 | return 0; | |
0ddcf43d | 163 | |
3c9e9f73 | 164 | new = fib_trie_unmerge(old); |
0ddcf43d AD |
165 | if (!new) |
166 | return -ENOMEM; | |
167 | ||
168 | /* replace merged table with clean table */ | |
169 | if (new != old) { | |
170 | fib_replace_table(net, old, new); | |
171 | fib_free_table(old); | |
172 | } | |
173 | ||
174 | return 0; | |
175 | } | |
176 | ||
e4aef8ae | 177 | static void fib_flush(struct net *net) |
1da177e4 LT |
178 | { |
179 | int flushed = 0; | |
1af5a8c4 | 180 | unsigned int h; |
1da177e4 | 181 | |
1af5a8c4 | 182 | for (h = 0; h < FIB_TABLE_HASHSZ; h++) { |
a7e53531 AD |
183 | struct hlist_head *head = &net->ipv4.fib_table_hash[h]; |
184 | struct hlist_node *tmp; | |
185 | struct fib_table *tb; | |
186 | ||
187 | hlist_for_each_entry_safe(tb, tmp, head, tb_hlist) | |
16c6cf8b | 188 | flushed += fib_table_flush(tb); |
1da177e4 | 189 | } |
1da177e4 LT |
190 | |
191 | if (flushed) | |
4ccfe6d4 | 192 | rt_cache_flush(net); |
1da177e4 LT |
193 | } |
194 | ||
104616e7 SF |
195 | void fib_flush_external(struct net *net) |
196 | { | |
197 | struct fib_table *tb; | |
198 | struct hlist_head *head; | |
199 | unsigned int h; | |
200 | ||
201 | for (h = 0; h < FIB_TABLE_HASHSZ; h++) { | |
202 | head = &net->ipv4.fib_table_hash[h]; | |
203 | hlist_for_each_entry(tb, head, tb_hlist) | |
204 | fib_table_flush_external(tb); | |
205 | } | |
206 | } | |
207 | ||
05538116 LAT |
208 | /* |
209 | * Find address type as if only "dev" was present in the system. If | |
210 | * on_dev is NULL then all interfaces are taken into consideration. | |
211 | */ | |
95c96174 ED |
212 | static inline unsigned int __inet_dev_addr_type(struct net *net, |
213 | const struct net_device *dev, | |
214 | __be32 addr) | |
1da177e4 | 215 | { |
9ade2286 | 216 | struct flowi4 fl4 = { .daddr = addr }; |
1da177e4 | 217 | struct fib_result res; |
95c96174 | 218 | unsigned int ret = RTN_BROADCAST; |
03cf786c | 219 | struct fib_table *local_table; |
1da177e4 | 220 | |
1e637c74 | 221 | if (ipv4_is_zeronet(addr) || ipv4_is_lbcast(addr)) |
1da177e4 | 222 | return RTN_BROADCAST; |
f97c1e0c | 223 | if (ipv4_is_multicast(addr)) |
1da177e4 LT |
224 | return RTN_MULTICAST; |
225 | ||
345e9b54 AD |
226 | rcu_read_lock(); |
227 | ||
6b175b26 | 228 | local_table = fib_get_table(net, RT_TABLE_LOCAL); |
03cf786c | 229 | if (local_table) { |
1da177e4 | 230 | ret = RTN_UNICAST; |
9ade2286 | 231 | if (!fib_table_lookup(local_table, &fl4, &res, FIB_LOOKUP_NOREF)) { |
05538116 LAT |
232 | if (!dev || dev == res.fi->fib_dev) |
233 | ret = res.type; | |
1da177e4 LT |
234 | } |
235 | } | |
345e9b54 AD |
236 | |
237 | rcu_read_unlock(); | |
1da177e4 LT |
238 | return ret; |
239 | } | |
240 | ||
6b175b26 | 241 | unsigned int inet_addr_type(struct net *net, __be32 addr) |
05538116 | 242 | { |
6b175b26 | 243 | return __inet_dev_addr_type(net, NULL, addr); |
05538116 | 244 | } |
4bc2f18b | 245 | EXPORT_SYMBOL(inet_addr_type); |
05538116 | 246 | |
6b175b26 EB |
247 | unsigned int inet_dev_addr_type(struct net *net, const struct net_device *dev, |
248 | __be32 addr) | |
05538116 | 249 | { |
6a31d2a9 | 250 | return __inet_dev_addr_type(net, dev, addr); |
05538116 | 251 | } |
4bc2f18b | 252 | EXPORT_SYMBOL(inet_dev_addr_type); |
05538116 | 253 | |
35ebf65e DM |
254 | __be32 fib_compute_spec_dst(struct sk_buff *skb) |
255 | { | |
256 | struct net_device *dev = skb->dev; | |
257 | struct in_device *in_dev; | |
258 | struct fib_result res; | |
a207a4b2 | 259 | struct rtable *rt; |
35ebf65e DM |
260 | struct flowi4 fl4; |
261 | struct net *net; | |
a207a4b2 | 262 | int scope; |
35ebf65e | 263 | |
a207a4b2 | 264 | rt = skb_rtable(skb); |
0cc535a2 JA |
265 | if ((rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST | RTCF_LOCAL)) == |
266 | RTCF_LOCAL) | |
35ebf65e DM |
267 | return ip_hdr(skb)->daddr; |
268 | ||
269 | in_dev = __in_dev_get_rcu(dev); | |
270 | BUG_ON(!in_dev); | |
35ebf65e DM |
271 | |
272 | net = dev_net(dev); | |
a207a4b2 DM |
273 | |
274 | scope = RT_SCOPE_UNIVERSE; | |
275 | if (!ipv4_is_zeronet(ip_hdr(skb)->saddr)) { | |
276 | fl4.flowi4_oif = 0; | |
1fb9489b | 277 | fl4.flowi4_iif = LOOPBACK_IFINDEX; |
a207a4b2 DM |
278 | fl4.daddr = ip_hdr(skb)->saddr; |
279 | fl4.saddr = 0; | |
280 | fl4.flowi4_tos = RT_TOS(ip_hdr(skb)->tos); | |
281 | fl4.flowi4_scope = scope; | |
282 | fl4.flowi4_mark = IN_DEV_SRC_VMARK(in_dev) ? skb->mark : 0; | |
0eeb075f | 283 | if (!fib_lookup(net, &fl4, &res, 0)) |
a207a4b2 DM |
284 | return FIB_RES_PREFSRC(net, res); |
285 | } else { | |
286 | scope = RT_SCOPE_LINK; | |
287 | } | |
288 | ||
289 | return inet_select_addr(dev, ip_hdr(skb)->saddr, scope); | |
35ebf65e DM |
290 | } |
291 | ||
1da177e4 | 292 | /* Given (packet source, input interface) and optional (dst, oif, tos): |
6a31d2a9 ED |
293 | * - (main) check, that source is valid i.e. not broadcast or our local |
294 | * address. | |
295 | * - figure out what "logical" interface this packet arrived | |
296 | * and calculate "specific destination" address. | |
297 | * - check, that packet arrived from expected physical interface. | |
ebc0ffae | 298 | * called with rcu_read_lock() |
1da177e4 | 299 | */ |
7a9bc9b8 DM |
300 | static int __fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst, |
301 | u8 tos, int oif, struct net_device *dev, | |
302 | int rpf, struct in_device *idev, u32 *itag) | |
1da177e4 | 303 | { |
1dced6a8 | 304 | int ret, no_addr; |
1da177e4 | 305 | struct fib_result res; |
9e56e380 | 306 | struct flowi4 fl4; |
5b707aaa | 307 | struct net *net; |
9e56e380 | 308 | bool dev_match; |
1da177e4 | 309 | |
9ade2286 | 310 | fl4.flowi4_oif = 0; |
6a662719 | 311 | fl4.flowi4_iif = oif ? : LOOPBACK_IFINDEX; |
9ade2286 DM |
312 | fl4.daddr = src; |
313 | fl4.saddr = dst; | |
314 | fl4.flowi4_tos = tos; | |
315 | fl4.flowi4_scope = RT_SCOPE_UNIVERSE; | |
cc7e17ea | 316 | |
9e56e380 | 317 | no_addr = idev->ifa_list == NULL; |
990078af | 318 | |
9e56e380 | 319 | fl4.flowi4_mark = IN_DEV_SRC_VMARK(idev) ? skb->mark : 0; |
1da177e4 | 320 | |
c346dca1 | 321 | net = dev_net(dev); |
0eeb075f | 322 | if (fib_lookup(net, &fl4, &res, 0)) |
1da177e4 | 323 | goto last_resort; |
1dced6a8 SB |
324 | if (res.type != RTN_UNICAST && |
325 | (res.type != RTN_LOCAL || !IN_DEV_ACCEPT_LOCAL(idev))) | |
326 | goto e_inval; | |
327 | if (!rpf && !fib_num_tclassid_users(dev_net(dev)) && | |
328 | (dev->ifindex != oif || !IN_DEV_TX_REDIRECTS(idev))) | |
329 | goto last_resort; | |
1da177e4 | 330 | fib_combine_itag(itag, &res); |
6f86b325 DM |
331 | dev_match = false; |
332 | ||
1da177e4 | 333 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
6f86b325 DM |
334 | for (ret = 0; ret < res.fi->fib_nhs; ret++) { |
335 | struct fib_nh *nh = &res.fi->fib_nh[ret]; | |
336 | ||
337 | if (nh->nh_dev == dev) { | |
338 | dev_match = true; | |
339 | break; | |
340 | } | |
341 | } | |
1da177e4 LT |
342 | #else |
343 | if (FIB_RES_DEV(res) == dev) | |
6f86b325 | 344 | dev_match = true; |
1da177e4 | 345 | #endif |
6f86b325 | 346 | if (dev_match) { |
1da177e4 | 347 | ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST; |
1da177e4 LT |
348 | return ret; |
349 | } | |
1da177e4 LT |
350 | if (no_addr) |
351 | goto last_resort; | |
c1cf8422 | 352 | if (rpf == 1) |
b5f7e755 | 353 | goto e_rpf; |
9ade2286 | 354 | fl4.flowi4_oif = dev->ifindex; |
1da177e4 LT |
355 | |
356 | ret = 0; | |
0eeb075f | 357 | if (fib_lookup(net, &fl4, &res, FIB_LOOKUP_IGNORE_LINKSTATE) == 0) { |
41347dcd | 358 | if (res.type == RTN_UNICAST) |
1da177e4 | 359 | ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST; |
1da177e4 LT |
360 | } |
361 | return ret; | |
362 | ||
363 | last_resort: | |
364 | if (rpf) | |
b5f7e755 | 365 | goto e_rpf; |
1da177e4 LT |
366 | *itag = 0; |
367 | return 0; | |
368 | ||
1da177e4 LT |
369 | e_inval: |
370 | return -EINVAL; | |
b5f7e755 ED |
371 | e_rpf: |
372 | return -EXDEV; | |
1da177e4 LT |
373 | } |
374 | ||
7a9bc9b8 DM |
375 | /* Ignore rp_filter for packets protected by IPsec. */ |
376 | int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst, | |
377 | u8 tos, int oif, struct net_device *dev, | |
378 | struct in_device *idev, u32 *itag) | |
379 | { | |
380 | int r = secpath_exists(skb) ? 0 : IN_DEV_RPFILTER(idev); | |
381 | ||
e81da0e1 | 382 | if (!r && !fib_num_tclassid_users(dev_net(dev)) && |
1dced6a8 | 383 | IN_DEV_ACCEPT_LOCAL(idev) && |
e81da0e1 | 384 | (dev->ifindex != oif || !IN_DEV_TX_REDIRECTS(idev))) { |
7a9bc9b8 DM |
385 | *itag = 0; |
386 | return 0; | |
387 | } | |
388 | return __fib_validate_source(skb, src, dst, tos, oif, dev, r, idev, itag); | |
389 | } | |
390 | ||
81f7bf6c | 391 | static inline __be32 sk_extract_addr(struct sockaddr *addr) |
4e902c57 TG |
392 | { |
393 | return ((struct sockaddr_in *) addr)->sin_addr.s_addr; | |
394 | } | |
395 | ||
396 | static int put_rtax(struct nlattr *mx, int len, int type, u32 value) | |
397 | { | |
398 | struct nlattr *nla; | |
399 | ||
400 | nla = (struct nlattr *) ((char *) mx + len); | |
401 | nla->nla_type = type; | |
402 | nla->nla_len = nla_attr_size(4); | |
403 | *(u32 *) nla_data(nla) = value; | |
404 | ||
405 | return len + nla_total_size(4); | |
406 | } | |
407 | ||
4b5d47d4 | 408 | static int rtentry_to_fib_config(struct net *net, int cmd, struct rtentry *rt, |
4e902c57 TG |
409 | struct fib_config *cfg) |
410 | { | |
6d85c10a | 411 | __be32 addr; |
4e902c57 TG |
412 | int plen; |
413 | ||
414 | memset(cfg, 0, sizeof(*cfg)); | |
4b5d47d4 | 415 | cfg->fc_nlinfo.nl_net = net; |
4e902c57 TG |
416 | |
417 | if (rt->rt_dst.sa_family != AF_INET) | |
418 | return -EAFNOSUPPORT; | |
419 | ||
420 | /* | |
421 | * Check mask for validity: | |
422 | * a) it must be contiguous. | |
423 | * b) destination must have all host bits clear. | |
424 | * c) if application forgot to set correct family (AF_INET), | |
425 | * reject request unless it is absolutely clear i.e. | |
426 | * both family and mask are zero. | |
427 | */ | |
428 | plen = 32; | |
429 | addr = sk_extract_addr(&rt->rt_dst); | |
430 | if (!(rt->rt_flags & RTF_HOST)) { | |
81f7bf6c | 431 | __be32 mask = sk_extract_addr(&rt->rt_genmask); |
4e902c57 TG |
432 | |
433 | if (rt->rt_genmask.sa_family != AF_INET) { | |
434 | if (mask || rt->rt_genmask.sa_family) | |
435 | return -EAFNOSUPPORT; | |
436 | } | |
437 | ||
438 | if (bad_mask(mask, addr)) | |
439 | return -EINVAL; | |
440 | ||
441 | plen = inet_mask_len(mask); | |
442 | } | |
443 | ||
444 | cfg->fc_dst_len = plen; | |
445 | cfg->fc_dst = addr; | |
446 | ||
447 | if (cmd != SIOCDELRT) { | |
448 | cfg->fc_nlflags = NLM_F_CREATE; | |
449 | cfg->fc_protocol = RTPROT_BOOT; | |
450 | } | |
451 | ||
452 | if (rt->rt_metric) | |
453 | cfg->fc_priority = rt->rt_metric - 1; | |
454 | ||
455 | if (rt->rt_flags & RTF_REJECT) { | |
456 | cfg->fc_scope = RT_SCOPE_HOST; | |
457 | cfg->fc_type = RTN_UNREACHABLE; | |
458 | return 0; | |
459 | } | |
460 | ||
461 | cfg->fc_scope = RT_SCOPE_NOWHERE; | |
462 | cfg->fc_type = RTN_UNICAST; | |
463 | ||
464 | if (rt->rt_dev) { | |
465 | char *colon; | |
466 | struct net_device *dev; | |
467 | char devname[IFNAMSIZ]; | |
468 | ||
469 | if (copy_from_user(devname, rt->rt_dev, IFNAMSIZ-1)) | |
470 | return -EFAULT; | |
471 | ||
472 | devname[IFNAMSIZ-1] = 0; | |
473 | colon = strchr(devname, ':'); | |
474 | if (colon) | |
475 | *colon = 0; | |
4b5d47d4 | 476 | dev = __dev_get_by_name(net, devname); |
4e902c57 TG |
477 | if (!dev) |
478 | return -ENODEV; | |
479 | cfg->fc_oif = dev->ifindex; | |
480 | if (colon) { | |
481 | struct in_ifaddr *ifa; | |
482 | struct in_device *in_dev = __in_dev_get_rtnl(dev); | |
483 | if (!in_dev) | |
484 | return -ENODEV; | |
485 | *colon = ':'; | |
486 | for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) | |
487 | if (strcmp(ifa->ifa_label, devname) == 0) | |
488 | break; | |
51456b29 | 489 | if (!ifa) |
4e902c57 TG |
490 | return -ENODEV; |
491 | cfg->fc_prefsrc = ifa->ifa_local; | |
492 | } | |
493 | } | |
494 | ||
495 | addr = sk_extract_addr(&rt->rt_gateway); | |
496 | if (rt->rt_gateway.sa_family == AF_INET && addr) { | |
497 | cfg->fc_gw = addr; | |
498 | if (rt->rt_flags & RTF_GATEWAY && | |
4b5d47d4 | 499 | inet_addr_type(net, addr) == RTN_UNICAST) |
4e902c57 TG |
500 | cfg->fc_scope = RT_SCOPE_UNIVERSE; |
501 | } | |
502 | ||
503 | if (cmd == SIOCDELRT) | |
504 | return 0; | |
505 | ||
506 | if (rt->rt_flags & RTF_GATEWAY && !cfg->fc_gw) | |
507 | return -EINVAL; | |
508 | ||
509 | if (cfg->fc_scope == RT_SCOPE_NOWHERE) | |
510 | cfg->fc_scope = RT_SCOPE_LINK; | |
511 | ||
512 | if (rt->rt_flags & (RTF_MTU | RTF_WINDOW | RTF_IRTT)) { | |
513 | struct nlattr *mx; | |
514 | int len = 0; | |
515 | ||
516 | mx = kzalloc(3 * nla_total_size(4), GFP_KERNEL); | |
51456b29 | 517 | if (!mx) |
4e902c57 TG |
518 | return -ENOMEM; |
519 | ||
520 | if (rt->rt_flags & RTF_MTU) | |
521 | len = put_rtax(mx, len, RTAX_ADVMSS, rt->rt_mtu - 40); | |
522 | ||
523 | if (rt->rt_flags & RTF_WINDOW) | |
524 | len = put_rtax(mx, len, RTAX_WINDOW, rt->rt_window); | |
525 | ||
526 | if (rt->rt_flags & RTF_IRTT) | |
527 | len = put_rtax(mx, len, RTAX_RTT, rt->rt_irtt << 3); | |
528 | ||
529 | cfg->fc_mx = mx; | |
530 | cfg->fc_mx_len = len; | |
531 | } | |
532 | ||
533 | return 0; | |
534 | } | |
535 | ||
1da177e4 | 536 | /* |
6a31d2a9 ED |
537 | * Handle IP routing ioctl calls. |
538 | * These are used to manipulate the routing tables | |
1da177e4 | 539 | */ |
1bad118a | 540 | int ip_rt_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
1da177e4 | 541 | { |
4e902c57 TG |
542 | struct fib_config cfg; |
543 | struct rtentry rt; | |
1da177e4 | 544 | int err; |
1da177e4 LT |
545 | |
546 | switch (cmd) { | |
547 | case SIOCADDRT: /* Add a route */ | |
548 | case SIOCDELRT: /* Delete a route */ | |
52e804c6 | 549 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 | 550 | return -EPERM; |
4e902c57 TG |
551 | |
552 | if (copy_from_user(&rt, arg, sizeof(rt))) | |
1da177e4 | 553 | return -EFAULT; |
4e902c57 | 554 | |
1da177e4 | 555 | rtnl_lock(); |
1bad118a | 556 | err = rtentry_to_fib_config(net, cmd, &rt, &cfg); |
1da177e4 | 557 | if (err == 0) { |
4e902c57 TG |
558 | struct fib_table *tb; |
559 | ||
1da177e4 | 560 | if (cmd == SIOCDELRT) { |
1bad118a | 561 | tb = fib_get_table(net, cfg.fc_table); |
1da177e4 | 562 | if (tb) |
16c6cf8b | 563 | err = fib_table_delete(tb, &cfg); |
4e902c57 TG |
564 | else |
565 | err = -ESRCH; | |
1da177e4 | 566 | } else { |
1bad118a | 567 | tb = fib_new_table(net, cfg.fc_table); |
1da177e4 | 568 | if (tb) |
16c6cf8b | 569 | err = fib_table_insert(tb, &cfg); |
4e902c57 TG |
570 | else |
571 | err = -ENOBUFS; | |
1da177e4 | 572 | } |
4e902c57 TG |
573 | |
574 | /* allocated by rtentry_to_fib_config() */ | |
575 | kfree(cfg.fc_mx); | |
1da177e4 LT |
576 | } |
577 | rtnl_unlock(); | |
578 | return err; | |
579 | } | |
580 | return -EINVAL; | |
581 | } | |
582 | ||
6a31d2a9 | 583 | const struct nla_policy rtm_ipv4_policy[RTA_MAX + 1] = { |
4e902c57 TG |
584 | [RTA_DST] = { .type = NLA_U32 }, |
585 | [RTA_SRC] = { .type = NLA_U32 }, | |
586 | [RTA_IIF] = { .type = NLA_U32 }, | |
587 | [RTA_OIF] = { .type = NLA_U32 }, | |
588 | [RTA_GATEWAY] = { .type = NLA_U32 }, | |
589 | [RTA_PRIORITY] = { .type = NLA_U32 }, | |
590 | [RTA_PREFSRC] = { .type = NLA_U32 }, | |
591 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
5176f91e | 592 | [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) }, |
4e902c57 | 593 | [RTA_FLOW] = { .type = NLA_U32 }, |
571e7226 RP |
594 | [RTA_ENCAP_TYPE] = { .type = NLA_U16 }, |
595 | [RTA_ENCAP] = { .type = NLA_NESTED }, | |
4e902c57 TG |
596 | }; |
597 | ||
4b5d47d4 | 598 | static int rtm_to_fib_config(struct net *net, struct sk_buff *skb, |
6a31d2a9 | 599 | struct nlmsghdr *nlh, struct fib_config *cfg) |
1da177e4 | 600 | { |
4e902c57 TG |
601 | struct nlattr *attr; |
602 | int err, remaining; | |
603 | struct rtmsg *rtm; | |
604 | ||
605 | err = nlmsg_validate(nlh, sizeof(*rtm), RTA_MAX, rtm_ipv4_policy); | |
606 | if (err < 0) | |
607 | goto errout; | |
608 | ||
609 | memset(cfg, 0, sizeof(*cfg)); | |
610 | ||
611 | rtm = nlmsg_data(nlh); | |
4e902c57 | 612 | cfg->fc_dst_len = rtm->rtm_dst_len; |
4e902c57 TG |
613 | cfg->fc_tos = rtm->rtm_tos; |
614 | cfg->fc_table = rtm->rtm_table; | |
615 | cfg->fc_protocol = rtm->rtm_protocol; | |
616 | cfg->fc_scope = rtm->rtm_scope; | |
617 | cfg->fc_type = rtm->rtm_type; | |
618 | cfg->fc_flags = rtm->rtm_flags; | |
619 | cfg->fc_nlflags = nlh->nlmsg_flags; | |
620 | ||
15e47304 | 621 | cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid; |
4e902c57 | 622 | cfg->fc_nlinfo.nlh = nlh; |
4b5d47d4 | 623 | cfg->fc_nlinfo.nl_net = net; |
4e902c57 | 624 | |
a0ee18b9 TG |
625 | if (cfg->fc_type > RTN_MAX) { |
626 | err = -EINVAL; | |
627 | goto errout; | |
628 | } | |
629 | ||
4e902c57 | 630 | nlmsg_for_each_attr(attr, nlh, sizeof(struct rtmsg), remaining) { |
8f4c1f9b | 631 | switch (nla_type(attr)) { |
4e902c57 | 632 | case RTA_DST: |
17fb2c64 | 633 | cfg->fc_dst = nla_get_be32(attr); |
4e902c57 | 634 | break; |
4e902c57 TG |
635 | case RTA_OIF: |
636 | cfg->fc_oif = nla_get_u32(attr); | |
637 | break; | |
638 | case RTA_GATEWAY: | |
17fb2c64 | 639 | cfg->fc_gw = nla_get_be32(attr); |
4e902c57 TG |
640 | break; |
641 | case RTA_PRIORITY: | |
642 | cfg->fc_priority = nla_get_u32(attr); | |
643 | break; | |
644 | case RTA_PREFSRC: | |
17fb2c64 | 645 | cfg->fc_prefsrc = nla_get_be32(attr); |
4e902c57 TG |
646 | break; |
647 | case RTA_METRICS: | |
648 | cfg->fc_mx = nla_data(attr); | |
649 | cfg->fc_mx_len = nla_len(attr); | |
650 | break; | |
651 | case RTA_MULTIPATH: | |
652 | cfg->fc_mp = nla_data(attr); | |
653 | cfg->fc_mp_len = nla_len(attr); | |
654 | break; | |
655 | case RTA_FLOW: | |
656 | cfg->fc_flow = nla_get_u32(attr); | |
657 | break; | |
4e902c57 TG |
658 | case RTA_TABLE: |
659 | cfg->fc_table = nla_get_u32(attr); | |
660 | break; | |
571e7226 RP |
661 | case RTA_ENCAP: |
662 | cfg->fc_encap = attr; | |
663 | break; | |
664 | case RTA_ENCAP_TYPE: | |
665 | cfg->fc_encap_type = nla_get_u16(attr); | |
666 | break; | |
1da177e4 LT |
667 | } |
668 | } | |
4e902c57 | 669 | |
1da177e4 | 670 | return 0; |
4e902c57 TG |
671 | errout: |
672 | return err; | |
1da177e4 LT |
673 | } |
674 | ||
661d2967 | 675 | static int inet_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh) |
1da177e4 | 676 | { |
3b1e0a65 | 677 | struct net *net = sock_net(skb->sk); |
4e902c57 TG |
678 | struct fib_config cfg; |
679 | struct fib_table *tb; | |
680 | int err; | |
1da177e4 | 681 | |
4b5d47d4 | 682 | err = rtm_to_fib_config(net, skb, nlh, &cfg); |
4e902c57 TG |
683 | if (err < 0) |
684 | goto errout; | |
1da177e4 | 685 | |
8ad4942c | 686 | tb = fib_get_table(net, cfg.fc_table); |
51456b29 | 687 | if (!tb) { |
4e902c57 TG |
688 | err = -ESRCH; |
689 | goto errout; | |
690 | } | |
691 | ||
16c6cf8b | 692 | err = fib_table_delete(tb, &cfg); |
4e902c57 TG |
693 | errout: |
694 | return err; | |
1da177e4 LT |
695 | } |
696 | ||
661d2967 | 697 | static int inet_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh) |
1da177e4 | 698 | { |
3b1e0a65 | 699 | struct net *net = sock_net(skb->sk); |
4e902c57 TG |
700 | struct fib_config cfg; |
701 | struct fib_table *tb; | |
702 | int err; | |
1da177e4 | 703 | |
4b5d47d4 | 704 | err = rtm_to_fib_config(net, skb, nlh, &cfg); |
4e902c57 TG |
705 | if (err < 0) |
706 | goto errout; | |
1da177e4 | 707 | |
226b0b4a | 708 | tb = fib_new_table(net, cfg.fc_table); |
51456b29 | 709 | if (!tb) { |
4e902c57 TG |
710 | err = -ENOBUFS; |
711 | goto errout; | |
712 | } | |
713 | ||
16c6cf8b | 714 | err = fib_table_insert(tb, &cfg); |
4e902c57 TG |
715 | errout: |
716 | return err; | |
1da177e4 LT |
717 | } |
718 | ||
63f3444f | 719 | static int inet_dump_fib(struct sk_buff *skb, struct netlink_callback *cb) |
1da177e4 | 720 | { |
3b1e0a65 | 721 | struct net *net = sock_net(skb->sk); |
1af5a8c4 PM |
722 | unsigned int h, s_h; |
723 | unsigned int e = 0, s_e; | |
1da177e4 | 724 | struct fib_table *tb; |
e4aef8ae | 725 | struct hlist_head *head; |
1af5a8c4 | 726 | int dumped = 0; |
1da177e4 | 727 | |
be403ea1 TG |
728 | if (nlmsg_len(cb->nlh) >= sizeof(struct rtmsg) && |
729 | ((struct rtmsg *) nlmsg_data(cb->nlh))->rtm_flags & RTM_F_CLONED) | |
0b8c7f6f | 730 | return skb->len; |
1da177e4 | 731 | |
1af5a8c4 PM |
732 | s_h = cb->args[0]; |
733 | s_e = cb->args[1]; | |
734 | ||
a7e53531 AD |
735 | rcu_read_lock(); |
736 | ||
1af5a8c4 PM |
737 | for (h = s_h; h < FIB_TABLE_HASHSZ; h++, s_e = 0) { |
738 | e = 0; | |
e4aef8ae | 739 | head = &net->ipv4.fib_table_hash[h]; |
a7e53531 | 740 | hlist_for_each_entry_rcu(tb, head, tb_hlist) { |
1af5a8c4 PM |
741 | if (e < s_e) |
742 | goto next; | |
743 | if (dumped) | |
744 | memset(&cb->args[2], 0, sizeof(cb->args) - | |
e905a9ed | 745 | 2 * sizeof(cb->args[0])); |
16c6cf8b | 746 | if (fib_table_dump(tb, skb, cb) < 0) |
1af5a8c4 PM |
747 | goto out; |
748 | dumped = 1; | |
749 | next: | |
750 | e++; | |
751 | } | |
1da177e4 | 752 | } |
1af5a8c4 | 753 | out: |
a7e53531 AD |
754 | rcu_read_unlock(); |
755 | ||
1af5a8c4 PM |
756 | cb->args[1] = e; |
757 | cb->args[0] = h; | |
1da177e4 LT |
758 | |
759 | return skb->len; | |
760 | } | |
761 | ||
762 | /* Prepare and feed intra-kernel routing request. | |
6a31d2a9 ED |
763 | * Really, it should be netlink message, but :-( netlink |
764 | * can be not configured, so that we feed it directly | |
765 | * to fib engine. It is legal, because all events occur | |
766 | * only when netlink is already locked. | |
1da177e4 | 767 | */ |
81f7bf6c | 768 | static void fib_magic(int cmd, int type, __be32 dst, int dst_len, struct in_ifaddr *ifa) |
1da177e4 | 769 | { |
c346dca1 | 770 | struct net *net = dev_net(ifa->ifa_dev->dev); |
4e902c57 TG |
771 | struct fib_table *tb; |
772 | struct fib_config cfg = { | |
773 | .fc_protocol = RTPROT_KERNEL, | |
774 | .fc_type = type, | |
775 | .fc_dst = dst, | |
776 | .fc_dst_len = dst_len, | |
777 | .fc_prefsrc = ifa->ifa_local, | |
778 | .fc_oif = ifa->ifa_dev->dev->ifindex, | |
779 | .fc_nlflags = NLM_F_CREATE | NLM_F_APPEND, | |
4d1169c1 | 780 | .fc_nlinfo = { |
4b5d47d4 | 781 | .nl_net = net, |
4d1169c1 | 782 | }, |
4e902c57 | 783 | }; |
1da177e4 LT |
784 | |
785 | if (type == RTN_UNICAST) | |
4b5d47d4 | 786 | tb = fib_new_table(net, RT_TABLE_MAIN); |
1da177e4 | 787 | else |
4b5d47d4 | 788 | tb = fib_new_table(net, RT_TABLE_LOCAL); |
1da177e4 | 789 | |
51456b29 | 790 | if (!tb) |
1da177e4 LT |
791 | return; |
792 | ||
4e902c57 | 793 | cfg.fc_table = tb->tb_id; |
1da177e4 | 794 | |
4e902c57 TG |
795 | if (type != RTN_LOCAL) |
796 | cfg.fc_scope = RT_SCOPE_LINK; | |
797 | else | |
798 | cfg.fc_scope = RT_SCOPE_HOST; | |
1da177e4 LT |
799 | |
800 | if (cmd == RTM_NEWROUTE) | |
16c6cf8b | 801 | fib_table_insert(tb, &cfg); |
1da177e4 | 802 | else |
16c6cf8b | 803 | fib_table_delete(tb, &cfg); |
1da177e4 LT |
804 | } |
805 | ||
0ff60a45 | 806 | void fib_add_ifaddr(struct in_ifaddr *ifa) |
1da177e4 LT |
807 | { |
808 | struct in_device *in_dev = ifa->ifa_dev; | |
809 | struct net_device *dev = in_dev->dev; | |
810 | struct in_ifaddr *prim = ifa; | |
a144ea4b AV |
811 | __be32 mask = ifa->ifa_mask; |
812 | __be32 addr = ifa->ifa_local; | |
6a31d2a9 | 813 | __be32 prefix = ifa->ifa_address & mask; |
1da177e4 | 814 | |
6a31d2a9 | 815 | if (ifa->ifa_flags & IFA_F_SECONDARY) { |
1da177e4 | 816 | prim = inet_ifa_byprefix(in_dev, prefix, mask); |
51456b29 | 817 | if (!prim) { |
058bd4d2 | 818 | pr_warn("%s: bug: prim == NULL\n", __func__); |
1da177e4 LT |
819 | return; |
820 | } | |
821 | } | |
822 | ||
823 | fib_magic(RTM_NEWROUTE, RTN_LOCAL, addr, 32, prim); | |
824 | ||
6a31d2a9 | 825 | if (!(dev->flags & IFF_UP)) |
1da177e4 LT |
826 | return; |
827 | ||
828 | /* Add broadcast address, if it is explicitly assigned. */ | |
a144ea4b | 829 | if (ifa->ifa_broadcast && ifa->ifa_broadcast != htonl(0xFFFFFFFF)) |
1da177e4 LT |
830 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim); |
831 | ||
6a31d2a9 | 832 | if (!ipv4_is_zeronet(prefix) && !(ifa->ifa_flags & IFA_F_SECONDARY) && |
1da177e4 | 833 | (prefix != addr || ifa->ifa_prefixlen < 32)) { |
6a31d2a9 ED |
834 | fib_magic(RTM_NEWROUTE, |
835 | dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST, | |
836 | prefix, ifa->ifa_prefixlen, prim); | |
1da177e4 LT |
837 | |
838 | /* Add network specific broadcasts, when it takes a sense */ | |
839 | if (ifa->ifa_prefixlen < 31) { | |
840 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix, 32, prim); | |
6a31d2a9 ED |
841 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix | ~mask, |
842 | 32, prim); | |
1da177e4 LT |
843 | } |
844 | } | |
845 | } | |
846 | ||
e6abbaa2 JA |
847 | /* Delete primary or secondary address. |
848 | * Optionally, on secondary address promotion consider the addresses | |
849 | * from subnet iprim as deleted, even if they are in device list. | |
850 | * In this case the secondary ifa can be in device list. | |
851 | */ | |
852 | void fib_del_ifaddr(struct in_ifaddr *ifa, struct in_ifaddr *iprim) | |
1da177e4 LT |
853 | { |
854 | struct in_device *in_dev = ifa->ifa_dev; | |
855 | struct net_device *dev = in_dev->dev; | |
856 | struct in_ifaddr *ifa1; | |
e6abbaa2 | 857 | struct in_ifaddr *prim = ifa, *prim1 = NULL; |
6a31d2a9 ED |
858 | __be32 brd = ifa->ifa_address | ~ifa->ifa_mask; |
859 | __be32 any = ifa->ifa_address & ifa->ifa_mask; | |
1da177e4 LT |
860 | #define LOCAL_OK 1 |
861 | #define BRD_OK 2 | |
862 | #define BRD0_OK 4 | |
863 | #define BRD1_OK 8 | |
95c96174 | 864 | unsigned int ok = 0; |
e6abbaa2 JA |
865 | int subnet = 0; /* Primary network */ |
866 | int gone = 1; /* Address is missing */ | |
867 | int same_prefsrc = 0; /* Another primary with same IP */ | |
1da177e4 | 868 | |
e6abbaa2 | 869 | if (ifa->ifa_flags & IFA_F_SECONDARY) { |
1da177e4 | 870 | prim = inet_ifa_byprefix(in_dev, any, ifa->ifa_mask); |
51456b29 | 871 | if (!prim) { |
058bd4d2 | 872 | pr_warn("%s: bug: prim == NULL\n", __func__); |
1da177e4 LT |
873 | return; |
874 | } | |
e6abbaa2 | 875 | if (iprim && iprim != prim) { |
058bd4d2 | 876 | pr_warn("%s: bug: iprim != prim\n", __func__); |
e6abbaa2 JA |
877 | return; |
878 | } | |
879 | } else if (!ipv4_is_zeronet(any) && | |
880 | (any != ifa->ifa_local || ifa->ifa_prefixlen < 32)) { | |
881 | fib_magic(RTM_DELROUTE, | |
882 | dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST, | |
883 | any, ifa->ifa_prefixlen, prim); | |
884 | subnet = 1; | |
1da177e4 LT |
885 | } |
886 | ||
887 | /* Deletion is more complicated than add. | |
6a31d2a9 ED |
888 | * We should take care of not to delete too much :-) |
889 | * | |
890 | * Scan address list to be sure that addresses are really gone. | |
1da177e4 LT |
891 | */ |
892 | ||
893 | for (ifa1 = in_dev->ifa_list; ifa1; ifa1 = ifa1->ifa_next) { | |
e6abbaa2 JA |
894 | if (ifa1 == ifa) { |
895 | /* promotion, keep the IP */ | |
896 | gone = 0; | |
897 | continue; | |
898 | } | |
899 | /* Ignore IFAs from our subnet */ | |
900 | if (iprim && ifa1->ifa_mask == iprim->ifa_mask && | |
901 | inet_ifa_match(ifa1->ifa_address, iprim)) | |
902 | continue; | |
903 | ||
904 | /* Ignore ifa1 if it uses different primary IP (prefsrc) */ | |
905 | if (ifa1->ifa_flags & IFA_F_SECONDARY) { | |
906 | /* Another address from our subnet? */ | |
907 | if (ifa1->ifa_mask == prim->ifa_mask && | |
908 | inet_ifa_match(ifa1->ifa_address, prim)) | |
909 | prim1 = prim; | |
910 | else { | |
911 | /* We reached the secondaries, so | |
912 | * same_prefsrc should be determined. | |
913 | */ | |
914 | if (!same_prefsrc) | |
915 | continue; | |
916 | /* Search new prim1 if ifa1 is not | |
917 | * using the current prim1 | |
918 | */ | |
919 | if (!prim1 || | |
920 | ifa1->ifa_mask != prim1->ifa_mask || | |
921 | !inet_ifa_match(ifa1->ifa_address, prim1)) | |
922 | prim1 = inet_ifa_byprefix(in_dev, | |
923 | ifa1->ifa_address, | |
924 | ifa1->ifa_mask); | |
925 | if (!prim1) | |
926 | continue; | |
927 | if (prim1->ifa_local != prim->ifa_local) | |
928 | continue; | |
929 | } | |
930 | } else { | |
931 | if (prim->ifa_local != ifa1->ifa_local) | |
932 | continue; | |
933 | prim1 = ifa1; | |
934 | if (prim != prim1) | |
935 | same_prefsrc = 1; | |
936 | } | |
1da177e4 LT |
937 | if (ifa->ifa_local == ifa1->ifa_local) |
938 | ok |= LOCAL_OK; | |
939 | if (ifa->ifa_broadcast == ifa1->ifa_broadcast) | |
940 | ok |= BRD_OK; | |
941 | if (brd == ifa1->ifa_broadcast) | |
942 | ok |= BRD1_OK; | |
943 | if (any == ifa1->ifa_broadcast) | |
944 | ok |= BRD0_OK; | |
e6abbaa2 JA |
945 | /* primary has network specific broadcasts */ |
946 | if (prim1 == ifa1 && ifa1->ifa_prefixlen < 31) { | |
947 | __be32 brd1 = ifa1->ifa_address | ~ifa1->ifa_mask; | |
948 | __be32 any1 = ifa1->ifa_address & ifa1->ifa_mask; | |
949 | ||
950 | if (!ipv4_is_zeronet(any1)) { | |
951 | if (ifa->ifa_broadcast == brd1 || | |
952 | ifa->ifa_broadcast == any1) | |
953 | ok |= BRD_OK; | |
954 | if (brd == brd1 || brd == any1) | |
955 | ok |= BRD1_OK; | |
956 | if (any == brd1 || any == any1) | |
957 | ok |= BRD0_OK; | |
958 | } | |
959 | } | |
1da177e4 LT |
960 | } |
961 | ||
6a31d2a9 | 962 | if (!(ok & BRD_OK)) |
1da177e4 | 963 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim); |
e6abbaa2 JA |
964 | if (subnet && ifa->ifa_prefixlen < 31) { |
965 | if (!(ok & BRD1_OK)) | |
966 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, brd, 32, prim); | |
967 | if (!(ok & BRD0_OK)) | |
968 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, any, 32, prim); | |
969 | } | |
6a31d2a9 | 970 | if (!(ok & LOCAL_OK)) { |
1da177e4 LT |
971 | fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 32, prim); |
972 | ||
973 | /* Check, that this local address finally disappeared. */ | |
e6abbaa2 JA |
974 | if (gone && |
975 | inet_addr_type(dev_net(dev), ifa->ifa_local) != RTN_LOCAL) { | |
1da177e4 | 976 | /* And the last, but not the least thing. |
6a31d2a9 ED |
977 | * We must flush stray FIB entries. |
978 | * | |
979 | * First of all, we scan fib_info list searching | |
980 | * for stray nexthop entries, then ignite fib_flush. | |
981 | */ | |
c346dca1 YH |
982 | if (fib_sync_down_addr(dev_net(dev), ifa->ifa_local)) |
983 | fib_flush(dev_net(dev)); | |
1da177e4 LT |
984 | } |
985 | } | |
986 | #undef LOCAL_OK | |
987 | #undef BRD_OK | |
988 | #undef BRD0_OK | |
989 | #undef BRD1_OK | |
990 | } | |
991 | ||
345e9b54 | 992 | static void nl_fib_lookup(struct net *net, struct fib_result_nl *frn) |
246955fe | 993 | { |
e905a9ed | 994 | |
246955fe | 995 | struct fib_result res; |
9ade2286 DM |
996 | struct flowi4 fl4 = { |
997 | .flowi4_mark = frn->fl_mark, | |
998 | .daddr = frn->fl_addr, | |
999 | .flowi4_tos = frn->fl_tos, | |
1000 | .flowi4_scope = frn->fl_scope, | |
6a31d2a9 | 1001 | }; |
345e9b54 AD |
1002 | struct fib_table *tb; |
1003 | ||
1004 | rcu_read_lock(); | |
1005 | ||
1006 | tb = fib_get_table(net, frn->tb_id_in); | |
1194ed0a AK |
1007 | |
1008 | frn->err = -ENOENT; | |
246955fe RO |
1009 | if (tb) { |
1010 | local_bh_disable(); | |
1011 | ||
1012 | frn->tb_id = tb->tb_id; | |
9ade2286 | 1013 | frn->err = fib_table_lookup(tb, &fl4, &res, FIB_LOOKUP_NOREF); |
246955fe RO |
1014 | |
1015 | if (!frn->err) { | |
1016 | frn->prefixlen = res.prefixlen; | |
1017 | frn->nh_sel = res.nh_sel; | |
1018 | frn->type = res.type; | |
1019 | frn->scope = res.scope; | |
1020 | } | |
1021 | local_bh_enable(); | |
1022 | } | |
345e9b54 AD |
1023 | |
1024 | rcu_read_unlock(); | |
246955fe RO |
1025 | } |
1026 | ||
28f7b036 | 1027 | static void nl_fib_input(struct sk_buff *skb) |
246955fe | 1028 | { |
6bd48fcf | 1029 | struct net *net; |
246955fe | 1030 | struct fib_result_nl *frn; |
28f7b036 | 1031 | struct nlmsghdr *nlh; |
15e47304 | 1032 | u32 portid; |
1194ed0a | 1033 | |
3b1e0a65 | 1034 | net = sock_net(skb->sk); |
b529ccf2 | 1035 | nlh = nlmsg_hdr(skb); |
573ce260 H |
1036 | if (skb->len < NLMSG_HDRLEN || skb->len < nlh->nlmsg_len || |
1037 | nlmsg_len(nlh) < sizeof(*frn)) | |
ea86575e | 1038 | return; |
d883a036 | 1039 | |
3a36515f | 1040 | skb = netlink_skb_clone(skb, GFP_KERNEL); |
51456b29 | 1041 | if (!skb) |
d883a036 DL |
1042 | return; |
1043 | nlh = nlmsg_hdr(skb); | |
e905a9ed | 1044 | |
573ce260 | 1045 | frn = (struct fib_result_nl *) nlmsg_data(nlh); |
345e9b54 | 1046 | nl_fib_lookup(net, frn); |
e905a9ed | 1047 | |
28a28283 | 1048 | portid = NETLINK_CB(skb).portid; /* netlink portid */ |
15e47304 | 1049 | NETLINK_CB(skb).portid = 0; /* from kernel */ |
ac6d439d | 1050 | NETLINK_CB(skb).dst_group = 0; /* unicast */ |
15e47304 | 1051 | netlink_unicast(net->ipv4.fibnl, skb, portid, MSG_DONTWAIT); |
e905a9ed | 1052 | } |
246955fe | 1053 | |
2c8c1e72 | 1054 | static int __net_init nl_fib_lookup_init(struct net *net) |
246955fe | 1055 | { |
6bd48fcf | 1056 | struct sock *sk; |
a31f2d17 PNA |
1057 | struct netlink_kernel_cfg cfg = { |
1058 | .input = nl_fib_input, | |
1059 | }; | |
1060 | ||
9f00d977 | 1061 | sk = netlink_kernel_create(net, NETLINK_FIB_LOOKUP, &cfg); |
51456b29 | 1062 | if (!sk) |
7b1a74fd | 1063 | return -EAFNOSUPPORT; |
6bd48fcf | 1064 | net->ipv4.fibnl = sk; |
7b1a74fd DL |
1065 | return 0; |
1066 | } | |
1067 | ||
1068 | static void nl_fib_lookup_exit(struct net *net) | |
1069 | { | |
b7c6ba6e | 1070 | netlink_kernel_release(net->ipv4.fibnl); |
775516bf | 1071 | net->ipv4.fibnl = NULL; |
246955fe RO |
1072 | } |
1073 | ||
8a3d0316 | 1074 | static void fib_disable_ip(struct net_device *dev, unsigned long event) |
1da177e4 | 1075 | { |
8a3d0316 | 1076 | if (fib_sync_down_dev(dev, event)) |
c346dca1 | 1077 | fib_flush(dev_net(dev)); |
4ccfe6d4 | 1078 | rt_cache_flush(dev_net(dev)); |
1da177e4 LT |
1079 | arp_ifdown(dev); |
1080 | } | |
1081 | ||
1082 | static int fib_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1083 | { | |
6ed2533e | 1084 | struct in_ifaddr *ifa = (struct in_ifaddr *)ptr; |
76e6ebfb | 1085 | struct net_device *dev = ifa->ifa_dev->dev; |
436c3b66 | 1086 | struct net *net = dev_net(dev); |
1da177e4 LT |
1087 | |
1088 | switch (event) { | |
1089 | case NETDEV_UP: | |
1090 | fib_add_ifaddr(ifa); | |
1091 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
8a3d0316 | 1092 | fib_sync_up(dev, RTNH_F_DEAD); |
1da177e4 | 1093 | #endif |
436c3b66 | 1094 | atomic_inc(&net->ipv4.dev_addr_genid); |
4ccfe6d4 | 1095 | rt_cache_flush(dev_net(dev)); |
1da177e4 LT |
1096 | break; |
1097 | case NETDEV_DOWN: | |
e6abbaa2 | 1098 | fib_del_ifaddr(ifa, NULL); |
436c3b66 | 1099 | atomic_inc(&net->ipv4.dev_addr_genid); |
51456b29 | 1100 | if (!ifa->ifa_dev->ifa_list) { |
1da177e4 | 1101 | /* Last address was deleted from this interface. |
6a31d2a9 | 1102 | * Disable IP. |
1da177e4 | 1103 | */ |
8a3d0316 | 1104 | fib_disable_ip(dev, event); |
1da177e4 | 1105 | } else { |
4ccfe6d4 | 1106 | rt_cache_flush(dev_net(dev)); |
1da177e4 LT |
1107 | } |
1108 | break; | |
1109 | } | |
1110 | return NOTIFY_DONE; | |
1111 | } | |
1112 | ||
1113 | static int fib_netdev_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1114 | { | |
351638e7 | 1115 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
0115e8e3 | 1116 | struct in_device *in_dev; |
436c3b66 | 1117 | struct net *net = dev_net(dev); |
8a3d0316 | 1118 | unsigned int flags; |
1da177e4 LT |
1119 | |
1120 | if (event == NETDEV_UNREGISTER) { | |
8a3d0316 | 1121 | fib_disable_ip(dev, event); |
caacf05e | 1122 | rt_flush_dev(dev); |
1da177e4 LT |
1123 | return NOTIFY_DONE; |
1124 | } | |
1125 | ||
0115e8e3 | 1126 | in_dev = __in_dev_get_rtnl(dev); |
a0065f26 OH |
1127 | if (!in_dev) |
1128 | return NOTIFY_DONE; | |
0115e8e3 | 1129 | |
1da177e4 LT |
1130 | switch (event) { |
1131 | case NETDEV_UP: | |
1132 | for_ifa(in_dev) { | |
1133 | fib_add_ifaddr(ifa); | |
1134 | } endfor_ifa(in_dev); | |
1135 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
8a3d0316 | 1136 | fib_sync_up(dev, RTNH_F_DEAD); |
1da177e4 | 1137 | #endif |
436c3b66 | 1138 | atomic_inc(&net->ipv4.dev_addr_genid); |
4ccfe6d4 | 1139 | rt_cache_flush(net); |
1da177e4 LT |
1140 | break; |
1141 | case NETDEV_DOWN: | |
8a3d0316 | 1142 | fib_disable_ip(dev, event); |
1da177e4 | 1143 | break; |
1da177e4 | 1144 | case NETDEV_CHANGE: |
8a3d0316 AG |
1145 | flags = dev_get_flags(dev); |
1146 | if (flags & (IFF_RUNNING | IFF_LOWER_UP)) | |
1147 | fib_sync_up(dev, RTNH_F_LINKDOWN); | |
1148 | else | |
1149 | fib_sync_down_dev(dev, event); | |
1150 | /* fall through */ | |
1151 | case NETDEV_CHANGEMTU: | |
4ccfe6d4 | 1152 | rt_cache_flush(net); |
1da177e4 LT |
1153 | break; |
1154 | } | |
1155 | return NOTIFY_DONE; | |
1156 | } | |
1157 | ||
1158 | static struct notifier_block fib_inetaddr_notifier = { | |
6ed2533e | 1159 | .notifier_call = fib_inetaddr_event, |
1da177e4 LT |
1160 | }; |
1161 | ||
1162 | static struct notifier_block fib_netdev_notifier = { | |
6ed2533e | 1163 | .notifier_call = fib_netdev_event, |
1da177e4 LT |
1164 | }; |
1165 | ||
7b1a74fd | 1166 | static int __net_init ip_fib_net_init(struct net *net) |
1da177e4 | 1167 | { |
dce5cbee | 1168 | int err; |
10da66f7 ED |
1169 | size_t size = sizeof(struct hlist_head) * FIB_TABLE_HASHSZ; |
1170 | ||
1171 | /* Avoid false sharing : Use at least a full cache line */ | |
1172 | size = max_t(size_t, size, L1_CACHE_BYTES); | |
1af5a8c4 | 1173 | |
10da66f7 | 1174 | net->ipv4.fib_table_hash = kzalloc(size, GFP_KERNEL); |
51456b29 | 1175 | if (!net->ipv4.fib_table_hash) |
e4aef8ae DL |
1176 | return -ENOMEM; |
1177 | ||
dce5cbee DL |
1178 | err = fib4_rules_init(net); |
1179 | if (err < 0) | |
1180 | goto fail; | |
1181 | return 0; | |
1182 | ||
1183 | fail: | |
1184 | kfree(net->ipv4.fib_table_hash); | |
1185 | return err; | |
7b1a74fd | 1186 | } |
1da177e4 | 1187 | |
2c8c1e72 | 1188 | static void ip_fib_net_exit(struct net *net) |
7b1a74fd DL |
1189 | { |
1190 | unsigned int i; | |
1191 | ||
6dede75b | 1192 | rtnl_lock(); |
6e47d6ca AD |
1193 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
1194 | RCU_INIT_POINTER(net->ipv4.fib_local, NULL); | |
1195 | RCU_INIT_POINTER(net->ipv4.fib_main, NULL); | |
1196 | RCU_INIT_POINTER(net->ipv4.fib_default, NULL); | |
1197 | #endif | |
7b1a74fd | 1198 | for (i = 0; i < FIB_TABLE_HASHSZ; i++) { |
a7e53531 | 1199 | struct hlist_head *head = &net->ipv4.fib_table_hash[i]; |
b67bfe0d | 1200 | struct hlist_node *tmp; |
a7e53531 AD |
1201 | struct fib_table *tb; |
1202 | ||
b67bfe0d SL |
1203 | hlist_for_each_entry_safe(tb, tmp, head, tb_hlist) { |
1204 | hlist_del(&tb->tb_hlist); | |
6e47d6ca | 1205 | fib_table_flush(tb); |
4aa2c466 | 1206 | fib_free_table(tb); |
7b1a74fd DL |
1207 | } |
1208 | } | |
ad88d051 AD |
1209 | |
1210 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
1211 | fib4_rules_exit(net); | |
1212 | #endif | |
e2666f84 | 1213 | rtnl_unlock(); |
e4aef8ae | 1214 | kfree(net->ipv4.fib_table_hash); |
7b1a74fd DL |
1215 | } |
1216 | ||
1217 | static int __net_init fib_net_init(struct net *net) | |
1218 | { | |
1219 | int error; | |
1220 | ||
f4530fa5 DM |
1221 | #ifdef CONFIG_IP_ROUTE_CLASSID |
1222 | net->ipv4.fib_num_tclassid_users = 0; | |
1223 | #endif | |
7b1a74fd DL |
1224 | error = ip_fib_net_init(net); |
1225 | if (error < 0) | |
1226 | goto out; | |
1227 | error = nl_fib_lookup_init(net); | |
1228 | if (error < 0) | |
1229 | goto out_nlfl; | |
1230 | error = fib_proc_init(net); | |
1231 | if (error < 0) | |
1232 | goto out_proc; | |
1233 | out: | |
1234 | return error; | |
1235 | ||
1236 | out_proc: | |
1237 | nl_fib_lookup_exit(net); | |
1238 | out_nlfl: | |
1239 | ip_fib_net_exit(net); | |
1240 | goto out; | |
1241 | } | |
1242 | ||
1243 | static void __net_exit fib_net_exit(struct net *net) | |
1244 | { | |
1245 | fib_proc_exit(net); | |
1246 | nl_fib_lookup_exit(net); | |
1247 | ip_fib_net_exit(net); | |
1248 | } | |
1249 | ||
1250 | static struct pernet_operations fib_net_ops = { | |
1251 | .init = fib_net_init, | |
1252 | .exit = fib_net_exit, | |
1253 | }; | |
1254 | ||
1255 | void __init ip_fib_init(void) | |
1256 | { | |
c7ac8679 GR |
1257 | rtnl_register(PF_INET, RTM_NEWROUTE, inet_rtm_newroute, NULL, NULL); |
1258 | rtnl_register(PF_INET, RTM_DELROUTE, inet_rtm_delroute, NULL, NULL); | |
1259 | rtnl_register(PF_INET, RTM_GETROUTE, NULL, inet_dump_fib, NULL); | |
7b1a74fd DL |
1260 | |
1261 | register_pernet_subsys(&fib_net_ops); | |
1262 | register_netdevice_notifier(&fib_netdev_notifier); | |
1263 | register_inetaddr_notifier(&fib_inetaddr_notifier); | |
7f9b8052 | 1264 | |
5348ba85 | 1265 | fib_trie_init(); |
1da177e4 | 1266 | } |