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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> | |
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); |
93456b6d | 56 | if (main_table == NULL) |
dbb50165 DL |
57 | goto fail; |
58 | ||
0ddcf43d AD |
59 | local_table = fib_trie_table(RT_TABLE_LOCAL, main_table); |
60 | if (local_table == NULL) | |
61 | return -ENOMEM; | |
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: | |
8274a97a | 70 | fib_free_table(local_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 | ||
159 | old = fib_get_table(net, RT_TABLE_LOCAL); | |
160 | new = fib_trie_unmerge(old); | |
161 | ||
162 | if (!new) | |
163 | return -ENOMEM; | |
164 | ||
165 | /* replace merged table with clean table */ | |
166 | if (new != old) { | |
167 | fib_replace_table(net, old, new); | |
168 | fib_free_table(old); | |
169 | } | |
170 | ||
171 | return 0; | |
172 | } | |
173 | ||
e4aef8ae | 174 | static void fib_flush(struct net *net) |
1da177e4 LT |
175 | { |
176 | int flushed = 0; | |
1af5a8c4 | 177 | unsigned int h; |
1da177e4 | 178 | |
1af5a8c4 | 179 | for (h = 0; h < FIB_TABLE_HASHSZ; h++) { |
a7e53531 AD |
180 | struct hlist_head *head = &net->ipv4.fib_table_hash[h]; |
181 | struct hlist_node *tmp; | |
182 | struct fib_table *tb; | |
183 | ||
184 | hlist_for_each_entry_safe(tb, tmp, head, tb_hlist) | |
16c6cf8b | 185 | flushed += fib_table_flush(tb); |
1da177e4 | 186 | } |
1da177e4 LT |
187 | |
188 | if (flushed) | |
4ccfe6d4 | 189 | rt_cache_flush(net); |
1da177e4 LT |
190 | } |
191 | ||
104616e7 SF |
192 | void fib_flush_external(struct net *net) |
193 | { | |
194 | struct fib_table *tb; | |
195 | struct hlist_head *head; | |
196 | unsigned int h; | |
197 | ||
198 | for (h = 0; h < FIB_TABLE_HASHSZ; h++) { | |
199 | head = &net->ipv4.fib_table_hash[h]; | |
200 | hlist_for_each_entry(tb, head, tb_hlist) | |
201 | fib_table_flush_external(tb); | |
202 | } | |
203 | } | |
204 | ||
05538116 LAT |
205 | /* |
206 | * Find address type as if only "dev" was present in the system. If | |
207 | * on_dev is NULL then all interfaces are taken into consideration. | |
208 | */ | |
95c96174 ED |
209 | static inline unsigned int __inet_dev_addr_type(struct net *net, |
210 | const struct net_device *dev, | |
211 | __be32 addr) | |
1da177e4 | 212 | { |
9ade2286 | 213 | struct flowi4 fl4 = { .daddr = addr }; |
1da177e4 | 214 | struct fib_result res; |
95c96174 | 215 | unsigned int ret = RTN_BROADCAST; |
03cf786c | 216 | struct fib_table *local_table; |
1da177e4 | 217 | |
1e637c74 | 218 | if (ipv4_is_zeronet(addr) || ipv4_is_lbcast(addr)) |
1da177e4 | 219 | return RTN_BROADCAST; |
f97c1e0c | 220 | if (ipv4_is_multicast(addr)) |
1da177e4 LT |
221 | return RTN_MULTICAST; |
222 | ||
345e9b54 AD |
223 | rcu_read_lock(); |
224 | ||
6b175b26 | 225 | local_table = fib_get_table(net, RT_TABLE_LOCAL); |
03cf786c | 226 | if (local_table) { |
1da177e4 | 227 | ret = RTN_UNICAST; |
9ade2286 | 228 | if (!fib_table_lookup(local_table, &fl4, &res, FIB_LOOKUP_NOREF)) { |
05538116 LAT |
229 | if (!dev || dev == res.fi->fib_dev) |
230 | ret = res.type; | |
1da177e4 LT |
231 | } |
232 | } | |
345e9b54 AD |
233 | |
234 | rcu_read_unlock(); | |
1da177e4 LT |
235 | return ret; |
236 | } | |
237 | ||
6b175b26 | 238 | unsigned int inet_addr_type(struct net *net, __be32 addr) |
05538116 | 239 | { |
6b175b26 | 240 | return __inet_dev_addr_type(net, NULL, addr); |
05538116 | 241 | } |
4bc2f18b | 242 | EXPORT_SYMBOL(inet_addr_type); |
05538116 | 243 | |
6b175b26 EB |
244 | unsigned int inet_dev_addr_type(struct net *net, const struct net_device *dev, |
245 | __be32 addr) | |
05538116 | 246 | { |
6a31d2a9 | 247 | return __inet_dev_addr_type(net, dev, addr); |
05538116 | 248 | } |
4bc2f18b | 249 | EXPORT_SYMBOL(inet_dev_addr_type); |
05538116 | 250 | |
35ebf65e DM |
251 | __be32 fib_compute_spec_dst(struct sk_buff *skb) |
252 | { | |
253 | struct net_device *dev = skb->dev; | |
254 | struct in_device *in_dev; | |
255 | struct fib_result res; | |
a207a4b2 | 256 | struct rtable *rt; |
35ebf65e DM |
257 | struct flowi4 fl4; |
258 | struct net *net; | |
a207a4b2 | 259 | int scope; |
35ebf65e | 260 | |
a207a4b2 | 261 | rt = skb_rtable(skb); |
0cc535a2 JA |
262 | if ((rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST | RTCF_LOCAL)) == |
263 | RTCF_LOCAL) | |
35ebf65e DM |
264 | return ip_hdr(skb)->daddr; |
265 | ||
266 | in_dev = __in_dev_get_rcu(dev); | |
267 | BUG_ON(!in_dev); | |
35ebf65e DM |
268 | |
269 | net = dev_net(dev); | |
a207a4b2 DM |
270 | |
271 | scope = RT_SCOPE_UNIVERSE; | |
272 | if (!ipv4_is_zeronet(ip_hdr(skb)->saddr)) { | |
273 | fl4.flowi4_oif = 0; | |
1fb9489b | 274 | fl4.flowi4_iif = LOOPBACK_IFINDEX; |
a207a4b2 DM |
275 | fl4.daddr = ip_hdr(skb)->saddr; |
276 | fl4.saddr = 0; | |
277 | fl4.flowi4_tos = RT_TOS(ip_hdr(skb)->tos); | |
278 | fl4.flowi4_scope = scope; | |
279 | fl4.flowi4_mark = IN_DEV_SRC_VMARK(in_dev) ? skb->mark : 0; | |
280 | if (!fib_lookup(net, &fl4, &res)) | |
281 | return FIB_RES_PREFSRC(net, res); | |
282 | } else { | |
283 | scope = RT_SCOPE_LINK; | |
284 | } | |
285 | ||
286 | return inet_select_addr(dev, ip_hdr(skb)->saddr, scope); | |
35ebf65e DM |
287 | } |
288 | ||
1da177e4 | 289 | /* Given (packet source, input interface) and optional (dst, oif, tos): |
6a31d2a9 ED |
290 | * - (main) check, that source is valid i.e. not broadcast or our local |
291 | * address. | |
292 | * - figure out what "logical" interface this packet arrived | |
293 | * and calculate "specific destination" address. | |
294 | * - check, that packet arrived from expected physical interface. | |
ebc0ffae | 295 | * called with rcu_read_lock() |
1da177e4 | 296 | */ |
7a9bc9b8 DM |
297 | static int __fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst, |
298 | u8 tos, int oif, struct net_device *dev, | |
299 | int rpf, struct in_device *idev, u32 *itag) | |
1da177e4 | 300 | { |
1dced6a8 | 301 | int ret, no_addr; |
1da177e4 | 302 | struct fib_result res; |
9e56e380 | 303 | struct flowi4 fl4; |
5b707aaa | 304 | struct net *net; |
9e56e380 | 305 | bool dev_match; |
1da177e4 | 306 | |
9ade2286 | 307 | fl4.flowi4_oif = 0; |
6a662719 | 308 | fl4.flowi4_iif = oif ? : LOOPBACK_IFINDEX; |
9ade2286 DM |
309 | fl4.daddr = src; |
310 | fl4.saddr = dst; | |
311 | fl4.flowi4_tos = tos; | |
312 | fl4.flowi4_scope = RT_SCOPE_UNIVERSE; | |
cc7e17ea | 313 | |
9e56e380 | 314 | no_addr = idev->ifa_list == NULL; |
990078af | 315 | |
9e56e380 | 316 | fl4.flowi4_mark = IN_DEV_SRC_VMARK(idev) ? skb->mark : 0; |
1da177e4 | 317 | |
c346dca1 | 318 | net = dev_net(dev); |
9ade2286 | 319 | if (fib_lookup(net, &fl4, &res)) |
1da177e4 | 320 | goto last_resort; |
1dced6a8 SB |
321 | if (res.type != RTN_UNICAST && |
322 | (res.type != RTN_LOCAL || !IN_DEV_ACCEPT_LOCAL(idev))) | |
323 | goto e_inval; | |
324 | if (!rpf && !fib_num_tclassid_users(dev_net(dev)) && | |
325 | (dev->ifindex != oif || !IN_DEV_TX_REDIRECTS(idev))) | |
326 | goto last_resort; | |
1da177e4 | 327 | fib_combine_itag(itag, &res); |
6f86b325 DM |
328 | dev_match = false; |
329 | ||
1da177e4 | 330 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
6f86b325 DM |
331 | for (ret = 0; ret < res.fi->fib_nhs; ret++) { |
332 | struct fib_nh *nh = &res.fi->fib_nh[ret]; | |
333 | ||
334 | if (nh->nh_dev == dev) { | |
335 | dev_match = true; | |
336 | break; | |
337 | } | |
338 | } | |
1da177e4 LT |
339 | #else |
340 | if (FIB_RES_DEV(res) == dev) | |
6f86b325 | 341 | dev_match = true; |
1da177e4 | 342 | #endif |
6f86b325 | 343 | if (dev_match) { |
1da177e4 | 344 | ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST; |
1da177e4 LT |
345 | return ret; |
346 | } | |
1da177e4 LT |
347 | if (no_addr) |
348 | goto last_resort; | |
c1cf8422 | 349 | if (rpf == 1) |
b5f7e755 | 350 | goto e_rpf; |
9ade2286 | 351 | fl4.flowi4_oif = dev->ifindex; |
1da177e4 LT |
352 | |
353 | ret = 0; | |
9ade2286 | 354 | if (fib_lookup(net, &fl4, &res) == 0) { |
41347dcd | 355 | if (res.type == RTN_UNICAST) |
1da177e4 | 356 | ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST; |
1da177e4 LT |
357 | } |
358 | return ret; | |
359 | ||
360 | last_resort: | |
361 | if (rpf) | |
b5f7e755 | 362 | goto e_rpf; |
1da177e4 LT |
363 | *itag = 0; |
364 | return 0; | |
365 | ||
1da177e4 LT |
366 | e_inval: |
367 | return -EINVAL; | |
b5f7e755 ED |
368 | e_rpf: |
369 | return -EXDEV; | |
1da177e4 LT |
370 | } |
371 | ||
7a9bc9b8 DM |
372 | /* Ignore rp_filter for packets protected by IPsec. */ |
373 | int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst, | |
374 | u8 tos, int oif, struct net_device *dev, | |
375 | struct in_device *idev, u32 *itag) | |
376 | { | |
377 | int r = secpath_exists(skb) ? 0 : IN_DEV_RPFILTER(idev); | |
378 | ||
e81da0e1 | 379 | if (!r && !fib_num_tclassid_users(dev_net(dev)) && |
1dced6a8 | 380 | IN_DEV_ACCEPT_LOCAL(idev) && |
e81da0e1 | 381 | (dev->ifindex != oif || !IN_DEV_TX_REDIRECTS(idev))) { |
7a9bc9b8 DM |
382 | *itag = 0; |
383 | return 0; | |
384 | } | |
385 | return __fib_validate_source(skb, src, dst, tos, oif, dev, r, idev, itag); | |
386 | } | |
387 | ||
81f7bf6c | 388 | static inline __be32 sk_extract_addr(struct sockaddr *addr) |
4e902c57 TG |
389 | { |
390 | return ((struct sockaddr_in *) addr)->sin_addr.s_addr; | |
391 | } | |
392 | ||
393 | static int put_rtax(struct nlattr *mx, int len, int type, u32 value) | |
394 | { | |
395 | struct nlattr *nla; | |
396 | ||
397 | nla = (struct nlattr *) ((char *) mx + len); | |
398 | nla->nla_type = type; | |
399 | nla->nla_len = nla_attr_size(4); | |
400 | *(u32 *) nla_data(nla) = value; | |
401 | ||
402 | return len + nla_total_size(4); | |
403 | } | |
404 | ||
4b5d47d4 | 405 | static int rtentry_to_fib_config(struct net *net, int cmd, struct rtentry *rt, |
4e902c57 TG |
406 | struct fib_config *cfg) |
407 | { | |
6d85c10a | 408 | __be32 addr; |
4e902c57 TG |
409 | int plen; |
410 | ||
411 | memset(cfg, 0, sizeof(*cfg)); | |
4b5d47d4 | 412 | cfg->fc_nlinfo.nl_net = net; |
4e902c57 TG |
413 | |
414 | if (rt->rt_dst.sa_family != AF_INET) | |
415 | return -EAFNOSUPPORT; | |
416 | ||
417 | /* | |
418 | * Check mask for validity: | |
419 | * a) it must be contiguous. | |
420 | * b) destination must have all host bits clear. | |
421 | * c) if application forgot to set correct family (AF_INET), | |
422 | * reject request unless it is absolutely clear i.e. | |
423 | * both family and mask are zero. | |
424 | */ | |
425 | plen = 32; | |
426 | addr = sk_extract_addr(&rt->rt_dst); | |
427 | if (!(rt->rt_flags & RTF_HOST)) { | |
81f7bf6c | 428 | __be32 mask = sk_extract_addr(&rt->rt_genmask); |
4e902c57 TG |
429 | |
430 | if (rt->rt_genmask.sa_family != AF_INET) { | |
431 | if (mask || rt->rt_genmask.sa_family) | |
432 | return -EAFNOSUPPORT; | |
433 | } | |
434 | ||
435 | if (bad_mask(mask, addr)) | |
436 | return -EINVAL; | |
437 | ||
438 | plen = inet_mask_len(mask); | |
439 | } | |
440 | ||
441 | cfg->fc_dst_len = plen; | |
442 | cfg->fc_dst = addr; | |
443 | ||
444 | if (cmd != SIOCDELRT) { | |
445 | cfg->fc_nlflags = NLM_F_CREATE; | |
446 | cfg->fc_protocol = RTPROT_BOOT; | |
447 | } | |
448 | ||
449 | if (rt->rt_metric) | |
450 | cfg->fc_priority = rt->rt_metric - 1; | |
451 | ||
452 | if (rt->rt_flags & RTF_REJECT) { | |
453 | cfg->fc_scope = RT_SCOPE_HOST; | |
454 | cfg->fc_type = RTN_UNREACHABLE; | |
455 | return 0; | |
456 | } | |
457 | ||
458 | cfg->fc_scope = RT_SCOPE_NOWHERE; | |
459 | cfg->fc_type = RTN_UNICAST; | |
460 | ||
461 | if (rt->rt_dev) { | |
462 | char *colon; | |
463 | struct net_device *dev; | |
464 | char devname[IFNAMSIZ]; | |
465 | ||
466 | if (copy_from_user(devname, rt->rt_dev, IFNAMSIZ-1)) | |
467 | return -EFAULT; | |
468 | ||
469 | devname[IFNAMSIZ-1] = 0; | |
470 | colon = strchr(devname, ':'); | |
471 | if (colon) | |
472 | *colon = 0; | |
4b5d47d4 | 473 | dev = __dev_get_by_name(net, devname); |
4e902c57 TG |
474 | if (!dev) |
475 | return -ENODEV; | |
476 | cfg->fc_oif = dev->ifindex; | |
477 | if (colon) { | |
478 | struct in_ifaddr *ifa; | |
479 | struct in_device *in_dev = __in_dev_get_rtnl(dev); | |
480 | if (!in_dev) | |
481 | return -ENODEV; | |
482 | *colon = ':'; | |
483 | for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) | |
484 | if (strcmp(ifa->ifa_label, devname) == 0) | |
485 | break; | |
486 | if (ifa == NULL) | |
487 | return -ENODEV; | |
488 | cfg->fc_prefsrc = ifa->ifa_local; | |
489 | } | |
490 | } | |
491 | ||
492 | addr = sk_extract_addr(&rt->rt_gateway); | |
493 | if (rt->rt_gateway.sa_family == AF_INET && addr) { | |
494 | cfg->fc_gw = addr; | |
495 | if (rt->rt_flags & RTF_GATEWAY && | |
4b5d47d4 | 496 | inet_addr_type(net, addr) == RTN_UNICAST) |
4e902c57 TG |
497 | cfg->fc_scope = RT_SCOPE_UNIVERSE; |
498 | } | |
499 | ||
500 | if (cmd == SIOCDELRT) | |
501 | return 0; | |
502 | ||
503 | if (rt->rt_flags & RTF_GATEWAY && !cfg->fc_gw) | |
504 | return -EINVAL; | |
505 | ||
506 | if (cfg->fc_scope == RT_SCOPE_NOWHERE) | |
507 | cfg->fc_scope = RT_SCOPE_LINK; | |
508 | ||
509 | if (rt->rt_flags & (RTF_MTU | RTF_WINDOW | RTF_IRTT)) { | |
510 | struct nlattr *mx; | |
511 | int len = 0; | |
512 | ||
513 | mx = kzalloc(3 * nla_total_size(4), GFP_KERNEL); | |
e905a9ed | 514 | if (mx == NULL) |
4e902c57 TG |
515 | return -ENOMEM; |
516 | ||
517 | if (rt->rt_flags & RTF_MTU) | |
518 | len = put_rtax(mx, len, RTAX_ADVMSS, rt->rt_mtu - 40); | |
519 | ||
520 | if (rt->rt_flags & RTF_WINDOW) | |
521 | len = put_rtax(mx, len, RTAX_WINDOW, rt->rt_window); | |
522 | ||
523 | if (rt->rt_flags & RTF_IRTT) | |
524 | len = put_rtax(mx, len, RTAX_RTT, rt->rt_irtt << 3); | |
525 | ||
526 | cfg->fc_mx = mx; | |
527 | cfg->fc_mx_len = len; | |
528 | } | |
529 | ||
530 | return 0; | |
531 | } | |
532 | ||
1da177e4 | 533 | /* |
6a31d2a9 ED |
534 | * Handle IP routing ioctl calls. |
535 | * These are used to manipulate the routing tables | |
1da177e4 | 536 | */ |
1bad118a | 537 | int ip_rt_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
1da177e4 | 538 | { |
4e902c57 TG |
539 | struct fib_config cfg; |
540 | struct rtentry rt; | |
1da177e4 | 541 | int err; |
1da177e4 LT |
542 | |
543 | switch (cmd) { | |
544 | case SIOCADDRT: /* Add a route */ | |
545 | case SIOCDELRT: /* Delete a route */ | |
52e804c6 | 546 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 | 547 | return -EPERM; |
4e902c57 TG |
548 | |
549 | if (copy_from_user(&rt, arg, sizeof(rt))) | |
1da177e4 | 550 | return -EFAULT; |
4e902c57 | 551 | |
1da177e4 | 552 | rtnl_lock(); |
1bad118a | 553 | err = rtentry_to_fib_config(net, cmd, &rt, &cfg); |
1da177e4 | 554 | if (err == 0) { |
4e902c57 TG |
555 | struct fib_table *tb; |
556 | ||
1da177e4 | 557 | if (cmd == SIOCDELRT) { |
1bad118a | 558 | tb = fib_get_table(net, cfg.fc_table); |
1da177e4 | 559 | if (tb) |
16c6cf8b | 560 | err = fib_table_delete(tb, &cfg); |
4e902c57 TG |
561 | else |
562 | err = -ESRCH; | |
1da177e4 | 563 | } else { |
1bad118a | 564 | tb = fib_new_table(net, cfg.fc_table); |
1da177e4 | 565 | if (tb) |
16c6cf8b | 566 | err = fib_table_insert(tb, &cfg); |
4e902c57 TG |
567 | else |
568 | err = -ENOBUFS; | |
1da177e4 | 569 | } |
4e902c57 TG |
570 | |
571 | /* allocated by rtentry_to_fib_config() */ | |
572 | kfree(cfg.fc_mx); | |
1da177e4 LT |
573 | } |
574 | rtnl_unlock(); | |
575 | return err; | |
576 | } | |
577 | return -EINVAL; | |
578 | } | |
579 | ||
6a31d2a9 | 580 | const struct nla_policy rtm_ipv4_policy[RTA_MAX + 1] = { |
4e902c57 TG |
581 | [RTA_DST] = { .type = NLA_U32 }, |
582 | [RTA_SRC] = { .type = NLA_U32 }, | |
583 | [RTA_IIF] = { .type = NLA_U32 }, | |
584 | [RTA_OIF] = { .type = NLA_U32 }, | |
585 | [RTA_GATEWAY] = { .type = NLA_U32 }, | |
586 | [RTA_PRIORITY] = { .type = NLA_U32 }, | |
587 | [RTA_PREFSRC] = { .type = NLA_U32 }, | |
588 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
5176f91e | 589 | [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) }, |
4e902c57 | 590 | [RTA_FLOW] = { .type = NLA_U32 }, |
4e902c57 TG |
591 | }; |
592 | ||
4b5d47d4 | 593 | static int rtm_to_fib_config(struct net *net, struct sk_buff *skb, |
6a31d2a9 | 594 | struct nlmsghdr *nlh, struct fib_config *cfg) |
1da177e4 | 595 | { |
4e902c57 TG |
596 | struct nlattr *attr; |
597 | int err, remaining; | |
598 | struct rtmsg *rtm; | |
599 | ||
600 | err = nlmsg_validate(nlh, sizeof(*rtm), RTA_MAX, rtm_ipv4_policy); | |
601 | if (err < 0) | |
602 | goto errout; | |
603 | ||
604 | memset(cfg, 0, sizeof(*cfg)); | |
605 | ||
606 | rtm = nlmsg_data(nlh); | |
4e902c57 | 607 | cfg->fc_dst_len = rtm->rtm_dst_len; |
4e902c57 TG |
608 | cfg->fc_tos = rtm->rtm_tos; |
609 | cfg->fc_table = rtm->rtm_table; | |
610 | cfg->fc_protocol = rtm->rtm_protocol; | |
611 | cfg->fc_scope = rtm->rtm_scope; | |
612 | cfg->fc_type = rtm->rtm_type; | |
613 | cfg->fc_flags = rtm->rtm_flags; | |
614 | cfg->fc_nlflags = nlh->nlmsg_flags; | |
615 | ||
15e47304 | 616 | cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid; |
4e902c57 | 617 | cfg->fc_nlinfo.nlh = nlh; |
4b5d47d4 | 618 | cfg->fc_nlinfo.nl_net = net; |
4e902c57 | 619 | |
a0ee18b9 TG |
620 | if (cfg->fc_type > RTN_MAX) { |
621 | err = -EINVAL; | |
622 | goto errout; | |
623 | } | |
624 | ||
4e902c57 | 625 | nlmsg_for_each_attr(attr, nlh, sizeof(struct rtmsg), remaining) { |
8f4c1f9b | 626 | switch (nla_type(attr)) { |
4e902c57 | 627 | case RTA_DST: |
17fb2c64 | 628 | cfg->fc_dst = nla_get_be32(attr); |
4e902c57 | 629 | break; |
4e902c57 TG |
630 | case RTA_OIF: |
631 | cfg->fc_oif = nla_get_u32(attr); | |
632 | break; | |
633 | case RTA_GATEWAY: | |
17fb2c64 | 634 | cfg->fc_gw = nla_get_be32(attr); |
4e902c57 TG |
635 | break; |
636 | case RTA_PRIORITY: | |
637 | cfg->fc_priority = nla_get_u32(attr); | |
638 | break; | |
639 | case RTA_PREFSRC: | |
17fb2c64 | 640 | cfg->fc_prefsrc = nla_get_be32(attr); |
4e902c57 TG |
641 | break; |
642 | case RTA_METRICS: | |
643 | cfg->fc_mx = nla_data(attr); | |
644 | cfg->fc_mx_len = nla_len(attr); | |
645 | break; | |
646 | case RTA_MULTIPATH: | |
647 | cfg->fc_mp = nla_data(attr); | |
648 | cfg->fc_mp_len = nla_len(attr); | |
649 | break; | |
650 | case RTA_FLOW: | |
651 | cfg->fc_flow = nla_get_u32(attr); | |
652 | break; | |
4e902c57 TG |
653 | case RTA_TABLE: |
654 | cfg->fc_table = nla_get_u32(attr); | |
655 | break; | |
1da177e4 LT |
656 | } |
657 | } | |
4e902c57 | 658 | |
1da177e4 | 659 | return 0; |
4e902c57 TG |
660 | errout: |
661 | return err; | |
1da177e4 LT |
662 | } |
663 | ||
661d2967 | 664 | static int inet_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh) |
1da177e4 | 665 | { |
3b1e0a65 | 666 | struct net *net = sock_net(skb->sk); |
4e902c57 TG |
667 | struct fib_config cfg; |
668 | struct fib_table *tb; | |
669 | int err; | |
1da177e4 | 670 | |
4b5d47d4 | 671 | err = rtm_to_fib_config(net, skb, nlh, &cfg); |
4e902c57 TG |
672 | if (err < 0) |
673 | goto errout; | |
1da177e4 | 674 | |
8ad4942c | 675 | tb = fib_get_table(net, cfg.fc_table); |
4e902c57 TG |
676 | if (tb == NULL) { |
677 | err = -ESRCH; | |
678 | goto errout; | |
679 | } | |
680 | ||
16c6cf8b | 681 | err = fib_table_delete(tb, &cfg); |
4e902c57 TG |
682 | errout: |
683 | return err; | |
1da177e4 LT |
684 | } |
685 | ||
661d2967 | 686 | static int inet_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh) |
1da177e4 | 687 | { |
3b1e0a65 | 688 | struct net *net = sock_net(skb->sk); |
4e902c57 TG |
689 | struct fib_config cfg; |
690 | struct fib_table *tb; | |
691 | int err; | |
1da177e4 | 692 | |
4b5d47d4 | 693 | err = rtm_to_fib_config(net, skb, nlh, &cfg); |
4e902c57 TG |
694 | if (err < 0) |
695 | goto errout; | |
1da177e4 | 696 | |
226b0b4a | 697 | tb = fib_new_table(net, cfg.fc_table); |
4e902c57 TG |
698 | if (tb == NULL) { |
699 | err = -ENOBUFS; | |
700 | goto errout; | |
701 | } | |
702 | ||
16c6cf8b | 703 | err = fib_table_insert(tb, &cfg); |
4e902c57 TG |
704 | errout: |
705 | return err; | |
1da177e4 LT |
706 | } |
707 | ||
63f3444f | 708 | static int inet_dump_fib(struct sk_buff *skb, struct netlink_callback *cb) |
1da177e4 | 709 | { |
3b1e0a65 | 710 | struct net *net = sock_net(skb->sk); |
1af5a8c4 PM |
711 | unsigned int h, s_h; |
712 | unsigned int e = 0, s_e; | |
1da177e4 | 713 | struct fib_table *tb; |
e4aef8ae | 714 | struct hlist_head *head; |
1af5a8c4 | 715 | int dumped = 0; |
1da177e4 | 716 | |
be403ea1 TG |
717 | if (nlmsg_len(cb->nlh) >= sizeof(struct rtmsg) && |
718 | ((struct rtmsg *) nlmsg_data(cb->nlh))->rtm_flags & RTM_F_CLONED) | |
0b8c7f6f | 719 | return skb->len; |
1da177e4 | 720 | |
1af5a8c4 PM |
721 | s_h = cb->args[0]; |
722 | s_e = cb->args[1]; | |
723 | ||
a7e53531 AD |
724 | rcu_read_lock(); |
725 | ||
1af5a8c4 PM |
726 | for (h = s_h; h < FIB_TABLE_HASHSZ; h++, s_e = 0) { |
727 | e = 0; | |
e4aef8ae | 728 | head = &net->ipv4.fib_table_hash[h]; |
a7e53531 | 729 | hlist_for_each_entry_rcu(tb, head, tb_hlist) { |
1af5a8c4 PM |
730 | if (e < s_e) |
731 | goto next; | |
732 | if (dumped) | |
733 | memset(&cb->args[2], 0, sizeof(cb->args) - | |
e905a9ed | 734 | 2 * sizeof(cb->args[0])); |
16c6cf8b | 735 | if (fib_table_dump(tb, skb, cb) < 0) |
1af5a8c4 PM |
736 | goto out; |
737 | dumped = 1; | |
738 | next: | |
739 | e++; | |
740 | } | |
1da177e4 | 741 | } |
1af5a8c4 | 742 | out: |
a7e53531 AD |
743 | rcu_read_unlock(); |
744 | ||
1af5a8c4 PM |
745 | cb->args[1] = e; |
746 | cb->args[0] = h; | |
1da177e4 LT |
747 | |
748 | return skb->len; | |
749 | } | |
750 | ||
751 | /* Prepare and feed intra-kernel routing request. | |
6a31d2a9 ED |
752 | * Really, it should be netlink message, but :-( netlink |
753 | * can be not configured, so that we feed it directly | |
754 | * to fib engine. It is legal, because all events occur | |
755 | * only when netlink is already locked. | |
1da177e4 | 756 | */ |
81f7bf6c | 757 | static void fib_magic(int cmd, int type, __be32 dst, int dst_len, struct in_ifaddr *ifa) |
1da177e4 | 758 | { |
c346dca1 | 759 | struct net *net = dev_net(ifa->ifa_dev->dev); |
4e902c57 TG |
760 | struct fib_table *tb; |
761 | struct fib_config cfg = { | |
762 | .fc_protocol = RTPROT_KERNEL, | |
763 | .fc_type = type, | |
764 | .fc_dst = dst, | |
765 | .fc_dst_len = dst_len, | |
766 | .fc_prefsrc = ifa->ifa_local, | |
767 | .fc_oif = ifa->ifa_dev->dev->ifindex, | |
768 | .fc_nlflags = NLM_F_CREATE | NLM_F_APPEND, | |
4d1169c1 | 769 | .fc_nlinfo = { |
4b5d47d4 | 770 | .nl_net = net, |
4d1169c1 | 771 | }, |
4e902c57 | 772 | }; |
1da177e4 LT |
773 | |
774 | if (type == RTN_UNICAST) | |
4b5d47d4 | 775 | tb = fib_new_table(net, RT_TABLE_MAIN); |
1da177e4 | 776 | else |
4b5d47d4 | 777 | tb = fib_new_table(net, RT_TABLE_LOCAL); |
1da177e4 LT |
778 | |
779 | if (tb == NULL) | |
780 | return; | |
781 | ||
4e902c57 | 782 | cfg.fc_table = tb->tb_id; |
1da177e4 | 783 | |
4e902c57 TG |
784 | if (type != RTN_LOCAL) |
785 | cfg.fc_scope = RT_SCOPE_LINK; | |
786 | else | |
787 | cfg.fc_scope = RT_SCOPE_HOST; | |
1da177e4 LT |
788 | |
789 | if (cmd == RTM_NEWROUTE) | |
16c6cf8b | 790 | fib_table_insert(tb, &cfg); |
1da177e4 | 791 | else |
16c6cf8b | 792 | fib_table_delete(tb, &cfg); |
1da177e4 LT |
793 | } |
794 | ||
0ff60a45 | 795 | void fib_add_ifaddr(struct in_ifaddr *ifa) |
1da177e4 LT |
796 | { |
797 | struct in_device *in_dev = ifa->ifa_dev; | |
798 | struct net_device *dev = in_dev->dev; | |
799 | struct in_ifaddr *prim = ifa; | |
a144ea4b AV |
800 | __be32 mask = ifa->ifa_mask; |
801 | __be32 addr = ifa->ifa_local; | |
6a31d2a9 | 802 | __be32 prefix = ifa->ifa_address & mask; |
1da177e4 | 803 | |
6a31d2a9 | 804 | if (ifa->ifa_flags & IFA_F_SECONDARY) { |
1da177e4 LT |
805 | prim = inet_ifa_byprefix(in_dev, prefix, mask); |
806 | if (prim == NULL) { | |
058bd4d2 | 807 | pr_warn("%s: bug: prim == NULL\n", __func__); |
1da177e4 LT |
808 | return; |
809 | } | |
810 | } | |
811 | ||
812 | fib_magic(RTM_NEWROUTE, RTN_LOCAL, addr, 32, prim); | |
813 | ||
6a31d2a9 | 814 | if (!(dev->flags & IFF_UP)) |
1da177e4 LT |
815 | return; |
816 | ||
817 | /* Add broadcast address, if it is explicitly assigned. */ | |
a144ea4b | 818 | if (ifa->ifa_broadcast && ifa->ifa_broadcast != htonl(0xFFFFFFFF)) |
1da177e4 LT |
819 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim); |
820 | ||
6a31d2a9 | 821 | if (!ipv4_is_zeronet(prefix) && !(ifa->ifa_flags & IFA_F_SECONDARY) && |
1da177e4 | 822 | (prefix != addr || ifa->ifa_prefixlen < 32)) { |
6a31d2a9 ED |
823 | fib_magic(RTM_NEWROUTE, |
824 | dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST, | |
825 | prefix, ifa->ifa_prefixlen, prim); | |
1da177e4 LT |
826 | |
827 | /* Add network specific broadcasts, when it takes a sense */ | |
828 | if (ifa->ifa_prefixlen < 31) { | |
829 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix, 32, prim); | |
6a31d2a9 ED |
830 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix | ~mask, |
831 | 32, prim); | |
1da177e4 LT |
832 | } |
833 | } | |
834 | } | |
835 | ||
e6abbaa2 JA |
836 | /* Delete primary or secondary address. |
837 | * Optionally, on secondary address promotion consider the addresses | |
838 | * from subnet iprim as deleted, even if they are in device list. | |
839 | * In this case the secondary ifa can be in device list. | |
840 | */ | |
841 | void fib_del_ifaddr(struct in_ifaddr *ifa, struct in_ifaddr *iprim) | |
1da177e4 LT |
842 | { |
843 | struct in_device *in_dev = ifa->ifa_dev; | |
844 | struct net_device *dev = in_dev->dev; | |
845 | struct in_ifaddr *ifa1; | |
e6abbaa2 | 846 | struct in_ifaddr *prim = ifa, *prim1 = NULL; |
6a31d2a9 ED |
847 | __be32 brd = ifa->ifa_address | ~ifa->ifa_mask; |
848 | __be32 any = ifa->ifa_address & ifa->ifa_mask; | |
1da177e4 LT |
849 | #define LOCAL_OK 1 |
850 | #define BRD_OK 2 | |
851 | #define BRD0_OK 4 | |
852 | #define BRD1_OK 8 | |
95c96174 | 853 | unsigned int ok = 0; |
e6abbaa2 JA |
854 | int subnet = 0; /* Primary network */ |
855 | int gone = 1; /* Address is missing */ | |
856 | int same_prefsrc = 0; /* Another primary with same IP */ | |
1da177e4 | 857 | |
e6abbaa2 | 858 | if (ifa->ifa_flags & IFA_F_SECONDARY) { |
1da177e4 LT |
859 | prim = inet_ifa_byprefix(in_dev, any, ifa->ifa_mask); |
860 | if (prim == NULL) { | |
058bd4d2 | 861 | pr_warn("%s: bug: prim == NULL\n", __func__); |
1da177e4 LT |
862 | return; |
863 | } | |
e6abbaa2 | 864 | if (iprim && iprim != prim) { |
058bd4d2 | 865 | pr_warn("%s: bug: iprim != prim\n", __func__); |
e6abbaa2 JA |
866 | return; |
867 | } | |
868 | } else if (!ipv4_is_zeronet(any) && | |
869 | (any != ifa->ifa_local || ifa->ifa_prefixlen < 32)) { | |
870 | fib_magic(RTM_DELROUTE, | |
871 | dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST, | |
872 | any, ifa->ifa_prefixlen, prim); | |
873 | subnet = 1; | |
1da177e4 LT |
874 | } |
875 | ||
876 | /* Deletion is more complicated than add. | |
6a31d2a9 ED |
877 | * We should take care of not to delete too much :-) |
878 | * | |
879 | * Scan address list to be sure that addresses are really gone. | |
1da177e4 LT |
880 | */ |
881 | ||
882 | for (ifa1 = in_dev->ifa_list; ifa1; ifa1 = ifa1->ifa_next) { | |
e6abbaa2 JA |
883 | if (ifa1 == ifa) { |
884 | /* promotion, keep the IP */ | |
885 | gone = 0; | |
886 | continue; | |
887 | } | |
888 | /* Ignore IFAs from our subnet */ | |
889 | if (iprim && ifa1->ifa_mask == iprim->ifa_mask && | |
890 | inet_ifa_match(ifa1->ifa_address, iprim)) | |
891 | continue; | |
892 | ||
893 | /* Ignore ifa1 if it uses different primary IP (prefsrc) */ | |
894 | if (ifa1->ifa_flags & IFA_F_SECONDARY) { | |
895 | /* Another address from our subnet? */ | |
896 | if (ifa1->ifa_mask == prim->ifa_mask && | |
897 | inet_ifa_match(ifa1->ifa_address, prim)) | |
898 | prim1 = prim; | |
899 | else { | |
900 | /* We reached the secondaries, so | |
901 | * same_prefsrc should be determined. | |
902 | */ | |
903 | if (!same_prefsrc) | |
904 | continue; | |
905 | /* Search new prim1 if ifa1 is not | |
906 | * using the current prim1 | |
907 | */ | |
908 | if (!prim1 || | |
909 | ifa1->ifa_mask != prim1->ifa_mask || | |
910 | !inet_ifa_match(ifa1->ifa_address, prim1)) | |
911 | prim1 = inet_ifa_byprefix(in_dev, | |
912 | ifa1->ifa_address, | |
913 | ifa1->ifa_mask); | |
914 | if (!prim1) | |
915 | continue; | |
916 | if (prim1->ifa_local != prim->ifa_local) | |
917 | continue; | |
918 | } | |
919 | } else { | |
920 | if (prim->ifa_local != ifa1->ifa_local) | |
921 | continue; | |
922 | prim1 = ifa1; | |
923 | if (prim != prim1) | |
924 | same_prefsrc = 1; | |
925 | } | |
1da177e4 LT |
926 | if (ifa->ifa_local == ifa1->ifa_local) |
927 | ok |= LOCAL_OK; | |
928 | if (ifa->ifa_broadcast == ifa1->ifa_broadcast) | |
929 | ok |= BRD_OK; | |
930 | if (brd == ifa1->ifa_broadcast) | |
931 | ok |= BRD1_OK; | |
932 | if (any == ifa1->ifa_broadcast) | |
933 | ok |= BRD0_OK; | |
e6abbaa2 JA |
934 | /* primary has network specific broadcasts */ |
935 | if (prim1 == ifa1 && ifa1->ifa_prefixlen < 31) { | |
936 | __be32 brd1 = ifa1->ifa_address | ~ifa1->ifa_mask; | |
937 | __be32 any1 = ifa1->ifa_address & ifa1->ifa_mask; | |
938 | ||
939 | if (!ipv4_is_zeronet(any1)) { | |
940 | if (ifa->ifa_broadcast == brd1 || | |
941 | ifa->ifa_broadcast == any1) | |
942 | ok |= BRD_OK; | |
943 | if (brd == brd1 || brd == any1) | |
944 | ok |= BRD1_OK; | |
945 | if (any == brd1 || any == any1) | |
946 | ok |= BRD0_OK; | |
947 | } | |
948 | } | |
1da177e4 LT |
949 | } |
950 | ||
6a31d2a9 | 951 | if (!(ok & BRD_OK)) |
1da177e4 | 952 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim); |
e6abbaa2 JA |
953 | if (subnet && ifa->ifa_prefixlen < 31) { |
954 | if (!(ok & BRD1_OK)) | |
955 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, brd, 32, prim); | |
956 | if (!(ok & BRD0_OK)) | |
957 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, any, 32, prim); | |
958 | } | |
6a31d2a9 | 959 | if (!(ok & LOCAL_OK)) { |
1da177e4 LT |
960 | fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 32, prim); |
961 | ||
962 | /* Check, that this local address finally disappeared. */ | |
e6abbaa2 JA |
963 | if (gone && |
964 | inet_addr_type(dev_net(dev), ifa->ifa_local) != RTN_LOCAL) { | |
1da177e4 | 965 | /* And the last, but not the least thing. |
6a31d2a9 ED |
966 | * We must flush stray FIB entries. |
967 | * | |
968 | * First of all, we scan fib_info list searching | |
969 | * for stray nexthop entries, then ignite fib_flush. | |
970 | */ | |
c346dca1 YH |
971 | if (fib_sync_down_addr(dev_net(dev), ifa->ifa_local)) |
972 | fib_flush(dev_net(dev)); | |
1da177e4 LT |
973 | } |
974 | } | |
975 | #undef LOCAL_OK | |
976 | #undef BRD_OK | |
977 | #undef BRD0_OK | |
978 | #undef BRD1_OK | |
979 | } | |
980 | ||
345e9b54 | 981 | static void nl_fib_lookup(struct net *net, struct fib_result_nl *frn) |
246955fe | 982 | { |
e905a9ed | 983 | |
246955fe | 984 | struct fib_result res; |
9ade2286 DM |
985 | struct flowi4 fl4 = { |
986 | .flowi4_mark = frn->fl_mark, | |
987 | .daddr = frn->fl_addr, | |
988 | .flowi4_tos = frn->fl_tos, | |
989 | .flowi4_scope = frn->fl_scope, | |
6a31d2a9 | 990 | }; |
345e9b54 AD |
991 | struct fib_table *tb; |
992 | ||
993 | rcu_read_lock(); | |
994 | ||
995 | tb = fib_get_table(net, frn->tb_id_in); | |
1194ed0a AK |
996 | |
997 | frn->err = -ENOENT; | |
246955fe RO |
998 | if (tb) { |
999 | local_bh_disable(); | |
1000 | ||
1001 | frn->tb_id = tb->tb_id; | |
9ade2286 | 1002 | frn->err = fib_table_lookup(tb, &fl4, &res, FIB_LOOKUP_NOREF); |
246955fe RO |
1003 | |
1004 | if (!frn->err) { | |
1005 | frn->prefixlen = res.prefixlen; | |
1006 | frn->nh_sel = res.nh_sel; | |
1007 | frn->type = res.type; | |
1008 | frn->scope = res.scope; | |
1009 | } | |
1010 | local_bh_enable(); | |
1011 | } | |
345e9b54 AD |
1012 | |
1013 | rcu_read_unlock(); | |
246955fe RO |
1014 | } |
1015 | ||
28f7b036 | 1016 | static void nl_fib_input(struct sk_buff *skb) |
246955fe | 1017 | { |
6bd48fcf | 1018 | struct net *net; |
246955fe | 1019 | struct fib_result_nl *frn; |
28f7b036 | 1020 | struct nlmsghdr *nlh; |
15e47304 | 1021 | u32 portid; |
1194ed0a | 1022 | |
3b1e0a65 | 1023 | net = sock_net(skb->sk); |
b529ccf2 | 1024 | nlh = nlmsg_hdr(skb); |
573ce260 H |
1025 | if (skb->len < NLMSG_HDRLEN || skb->len < nlh->nlmsg_len || |
1026 | nlmsg_len(nlh) < sizeof(*frn)) | |
ea86575e | 1027 | return; |
d883a036 | 1028 | |
3a36515f | 1029 | skb = netlink_skb_clone(skb, GFP_KERNEL); |
d883a036 DL |
1030 | if (skb == NULL) |
1031 | return; | |
1032 | nlh = nlmsg_hdr(skb); | |
e905a9ed | 1033 | |
573ce260 | 1034 | frn = (struct fib_result_nl *) nlmsg_data(nlh); |
345e9b54 | 1035 | nl_fib_lookup(net, frn); |
e905a9ed | 1036 | |
28a28283 | 1037 | portid = NETLINK_CB(skb).portid; /* netlink portid */ |
15e47304 | 1038 | NETLINK_CB(skb).portid = 0; /* from kernel */ |
ac6d439d | 1039 | NETLINK_CB(skb).dst_group = 0; /* unicast */ |
15e47304 | 1040 | netlink_unicast(net->ipv4.fibnl, skb, portid, MSG_DONTWAIT); |
e905a9ed | 1041 | } |
246955fe | 1042 | |
2c8c1e72 | 1043 | static int __net_init nl_fib_lookup_init(struct net *net) |
246955fe | 1044 | { |
6bd48fcf | 1045 | struct sock *sk; |
a31f2d17 PNA |
1046 | struct netlink_kernel_cfg cfg = { |
1047 | .input = nl_fib_input, | |
1048 | }; | |
1049 | ||
9f00d977 | 1050 | sk = netlink_kernel_create(net, NETLINK_FIB_LOOKUP, &cfg); |
6bd48fcf | 1051 | if (sk == NULL) |
7b1a74fd | 1052 | return -EAFNOSUPPORT; |
6bd48fcf | 1053 | net->ipv4.fibnl = sk; |
7b1a74fd DL |
1054 | return 0; |
1055 | } | |
1056 | ||
1057 | static void nl_fib_lookup_exit(struct net *net) | |
1058 | { | |
b7c6ba6e | 1059 | netlink_kernel_release(net->ipv4.fibnl); |
775516bf | 1060 | net->ipv4.fibnl = NULL; |
246955fe RO |
1061 | } |
1062 | ||
4ccfe6d4 | 1063 | static void fib_disable_ip(struct net_device *dev, int force) |
1da177e4 | 1064 | { |
85326fa5 | 1065 | if (fib_sync_down_dev(dev, force)) |
c346dca1 | 1066 | fib_flush(dev_net(dev)); |
4ccfe6d4 | 1067 | rt_cache_flush(dev_net(dev)); |
1da177e4 LT |
1068 | arp_ifdown(dev); |
1069 | } | |
1070 | ||
1071 | static int fib_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1072 | { | |
6ed2533e | 1073 | struct in_ifaddr *ifa = (struct in_ifaddr *)ptr; |
76e6ebfb | 1074 | struct net_device *dev = ifa->ifa_dev->dev; |
436c3b66 | 1075 | struct net *net = dev_net(dev); |
1da177e4 LT |
1076 | |
1077 | switch (event) { | |
1078 | case NETDEV_UP: | |
1079 | fib_add_ifaddr(ifa); | |
1080 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
76e6ebfb | 1081 | fib_sync_up(dev); |
1da177e4 | 1082 | #endif |
436c3b66 | 1083 | atomic_inc(&net->ipv4.dev_addr_genid); |
4ccfe6d4 | 1084 | rt_cache_flush(dev_net(dev)); |
1da177e4 LT |
1085 | break; |
1086 | case NETDEV_DOWN: | |
e6abbaa2 | 1087 | fib_del_ifaddr(ifa, NULL); |
436c3b66 | 1088 | atomic_inc(&net->ipv4.dev_addr_genid); |
9fcc2e8a | 1089 | if (ifa->ifa_dev->ifa_list == NULL) { |
1da177e4 | 1090 | /* Last address was deleted from this interface. |
6a31d2a9 | 1091 | * Disable IP. |
1da177e4 | 1092 | */ |
4ccfe6d4 | 1093 | fib_disable_ip(dev, 1); |
1da177e4 | 1094 | } else { |
4ccfe6d4 | 1095 | rt_cache_flush(dev_net(dev)); |
1da177e4 LT |
1096 | } |
1097 | break; | |
1098 | } | |
1099 | return NOTIFY_DONE; | |
1100 | } | |
1101 | ||
1102 | static int fib_netdev_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1103 | { | |
351638e7 | 1104 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
0115e8e3 | 1105 | struct in_device *in_dev; |
436c3b66 | 1106 | struct net *net = dev_net(dev); |
1da177e4 LT |
1107 | |
1108 | if (event == NETDEV_UNREGISTER) { | |
4ccfe6d4 | 1109 | fib_disable_ip(dev, 2); |
caacf05e | 1110 | rt_flush_dev(dev); |
1da177e4 LT |
1111 | return NOTIFY_DONE; |
1112 | } | |
1113 | ||
0115e8e3 | 1114 | in_dev = __in_dev_get_rtnl(dev); |
a0065f26 OH |
1115 | if (!in_dev) |
1116 | return NOTIFY_DONE; | |
0115e8e3 | 1117 | |
1da177e4 LT |
1118 | switch (event) { |
1119 | case NETDEV_UP: | |
1120 | for_ifa(in_dev) { | |
1121 | fib_add_ifaddr(ifa); | |
1122 | } endfor_ifa(in_dev); | |
1123 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
1124 | fib_sync_up(dev); | |
1125 | #endif | |
436c3b66 | 1126 | atomic_inc(&net->ipv4.dev_addr_genid); |
4ccfe6d4 | 1127 | rt_cache_flush(net); |
1da177e4 LT |
1128 | break; |
1129 | case NETDEV_DOWN: | |
4ccfe6d4 | 1130 | fib_disable_ip(dev, 0); |
1da177e4 LT |
1131 | break; |
1132 | case NETDEV_CHANGEMTU: | |
1133 | case NETDEV_CHANGE: | |
4ccfe6d4 | 1134 | rt_cache_flush(net); |
1da177e4 LT |
1135 | break; |
1136 | } | |
1137 | return NOTIFY_DONE; | |
1138 | } | |
1139 | ||
1140 | static struct notifier_block fib_inetaddr_notifier = { | |
6ed2533e | 1141 | .notifier_call = fib_inetaddr_event, |
1da177e4 LT |
1142 | }; |
1143 | ||
1144 | static struct notifier_block fib_netdev_notifier = { | |
6ed2533e | 1145 | .notifier_call = fib_netdev_event, |
1da177e4 LT |
1146 | }; |
1147 | ||
7b1a74fd | 1148 | static int __net_init ip_fib_net_init(struct net *net) |
1da177e4 | 1149 | { |
dce5cbee | 1150 | int err; |
10da66f7 ED |
1151 | size_t size = sizeof(struct hlist_head) * FIB_TABLE_HASHSZ; |
1152 | ||
1153 | /* Avoid false sharing : Use at least a full cache line */ | |
1154 | size = max_t(size_t, size, L1_CACHE_BYTES); | |
1af5a8c4 | 1155 | |
10da66f7 | 1156 | net->ipv4.fib_table_hash = kzalloc(size, GFP_KERNEL); |
e4aef8ae DL |
1157 | if (net->ipv4.fib_table_hash == NULL) |
1158 | return -ENOMEM; | |
1159 | ||
dce5cbee DL |
1160 | err = fib4_rules_init(net); |
1161 | if (err < 0) | |
1162 | goto fail; | |
1163 | return 0; | |
1164 | ||
1165 | fail: | |
1166 | kfree(net->ipv4.fib_table_hash); | |
1167 | return err; | |
7b1a74fd | 1168 | } |
1da177e4 | 1169 | |
2c8c1e72 | 1170 | static void ip_fib_net_exit(struct net *net) |
7b1a74fd DL |
1171 | { |
1172 | unsigned int i; | |
1173 | ||
1174 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
1175 | fib4_rules_exit(net); | |
1176 | #endif | |
1177 | ||
e2666f84 | 1178 | rtnl_lock(); |
7b1a74fd | 1179 | for (i = 0; i < FIB_TABLE_HASHSZ; i++) { |
a7e53531 | 1180 | struct hlist_head *head = &net->ipv4.fib_table_hash[i]; |
b67bfe0d | 1181 | struct hlist_node *tmp; |
a7e53531 AD |
1182 | struct fib_table *tb; |
1183 | ||
1184 | /* this is done in two passes as flushing the table could | |
1185 | * cause it to be reallocated in order to accommodate new | |
1186 | * tnodes at the root as the table shrinks. | |
1187 | */ | |
1188 | hlist_for_each_entry_safe(tb, tmp, head, tb_hlist) | |
1189 | fib_table_flush(tb); | |
63f3444f | 1190 | |
b67bfe0d | 1191 | hlist_for_each_entry_safe(tb, tmp, head, tb_hlist) { |
a7e53531 AD |
1192 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
1193 | switch (tb->tb_id) { | |
1194 | case RT_TABLE_LOCAL: | |
1195 | RCU_INIT_POINTER(net->ipv4.fib_local, NULL); | |
1196 | break; | |
1197 | case RT_TABLE_MAIN: | |
1198 | RCU_INIT_POINTER(net->ipv4.fib_main, NULL); | |
1199 | break; | |
1200 | case RT_TABLE_DEFAULT: | |
1201 | RCU_INIT_POINTER(net->ipv4.fib_default, NULL); | |
1202 | break; | |
1203 | default: | |
1204 | break; | |
1205 | } | |
1206 | #endif | |
b67bfe0d | 1207 | hlist_del(&tb->tb_hlist); |
4aa2c466 | 1208 | fib_free_table(tb); |
7b1a74fd DL |
1209 | } |
1210 | } | |
e2666f84 | 1211 | rtnl_unlock(); |
e4aef8ae | 1212 | kfree(net->ipv4.fib_table_hash); |
7b1a74fd DL |
1213 | } |
1214 | ||
1215 | static int __net_init fib_net_init(struct net *net) | |
1216 | { | |
1217 | int error; | |
1218 | ||
f4530fa5 DM |
1219 | #ifdef CONFIG_IP_ROUTE_CLASSID |
1220 | net->ipv4.fib_num_tclassid_users = 0; | |
1221 | #endif | |
7b1a74fd DL |
1222 | error = ip_fib_net_init(net); |
1223 | if (error < 0) | |
1224 | goto out; | |
1225 | error = nl_fib_lookup_init(net); | |
1226 | if (error < 0) | |
1227 | goto out_nlfl; | |
1228 | error = fib_proc_init(net); | |
1229 | if (error < 0) | |
1230 | goto out_proc; | |
1231 | out: | |
1232 | return error; | |
1233 | ||
1234 | out_proc: | |
1235 | nl_fib_lookup_exit(net); | |
1236 | out_nlfl: | |
1237 | ip_fib_net_exit(net); | |
1238 | goto out; | |
1239 | } | |
1240 | ||
1241 | static void __net_exit fib_net_exit(struct net *net) | |
1242 | { | |
1243 | fib_proc_exit(net); | |
1244 | nl_fib_lookup_exit(net); | |
1245 | ip_fib_net_exit(net); | |
1246 | } | |
1247 | ||
1248 | static struct pernet_operations fib_net_ops = { | |
1249 | .init = fib_net_init, | |
1250 | .exit = fib_net_exit, | |
1251 | }; | |
1252 | ||
1253 | void __init ip_fib_init(void) | |
1254 | { | |
c7ac8679 GR |
1255 | rtnl_register(PF_INET, RTM_NEWROUTE, inet_rtm_newroute, NULL, NULL); |
1256 | rtnl_register(PF_INET, RTM_DELROUTE, inet_rtm_delroute, NULL, NULL); | |
1257 | rtnl_register(PF_INET, RTM_GETROUTE, NULL, inet_dump_fib, NULL); | |
7b1a74fd DL |
1258 | |
1259 | register_pernet_subsys(&fib_net_ops); | |
1260 | register_netdevice_notifier(&fib_netdev_notifier); | |
1261 | register_inetaddr_notifier(&fib_inetaddr_notifier); | |
7f9b8052 | 1262 | |
5348ba85 | 1263 | fib_trie_init(); |
1da177e4 | 1264 | } |