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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> |
cd2fbe1b | 48 | #include <net/vrf.h> |
1da177e4 | 49 | |
1da177e4 LT |
50 | #ifndef CONFIG_IP_MULTIPLE_TABLES |
51 | ||
7b1a74fd | 52 | static int __net_init fib4_rules_init(struct net *net) |
c3e9a353 | 53 | { |
93456b6d DL |
54 | struct fib_table *local_table, *main_table; |
55 | ||
0ddcf43d | 56 | main_table = fib_trie_table(RT_TABLE_MAIN, NULL); |
51456b29 | 57 | if (!main_table) |
61f0d861 | 58 | return -ENOMEM; |
dbb50165 | 59 | |
0ddcf43d | 60 | local_table = fib_trie_table(RT_TABLE_LOCAL, main_table); |
51456b29 | 61 | if (!local_table) |
61f0d861 | 62 | goto fail; |
0ddcf43d | 63 | |
93456b6d | 64 | hlist_add_head_rcu(&local_table->tb_hlist, |
e4aef8ae | 65 | &net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX]); |
93456b6d | 66 | hlist_add_head_rcu(&main_table->tb_hlist, |
e4aef8ae | 67 | &net->ipv4.fib_table_hash[TABLE_MAIN_INDEX]); |
dbb50165 DL |
68 | return 0; |
69 | ||
70 | fail: | |
61f0d861 | 71 | fib_free_table(main_table); |
dbb50165 | 72 | return -ENOMEM; |
c3e9a353 | 73 | } |
1af5a8c4 | 74 | #else |
1da177e4 | 75 | |
8ad4942c | 76 | struct fib_table *fib_new_table(struct net *net, u32 id) |
1da177e4 | 77 | { |
0ddcf43d | 78 | struct fib_table *tb, *alias = NULL; |
1af5a8c4 | 79 | unsigned int h; |
1da177e4 | 80 | |
1af5a8c4 PM |
81 | if (id == 0) |
82 | id = RT_TABLE_MAIN; | |
8ad4942c | 83 | tb = fib_get_table(net, id); |
1af5a8c4 PM |
84 | if (tb) |
85 | return tb; | |
7f9b8052 | 86 | |
0ddcf43d AD |
87 | if (id == RT_TABLE_LOCAL) |
88 | alias = fib_new_table(net, RT_TABLE_MAIN); | |
89 | ||
90 | tb = fib_trie_table(id, alias); | |
1da177e4 LT |
91 | if (!tb) |
92 | return NULL; | |
f4530fa5 DM |
93 | |
94 | switch (id) { | |
95 | case RT_TABLE_LOCAL: | |
a7e53531 | 96 | rcu_assign_pointer(net->ipv4.fib_local, tb); |
f4530fa5 | 97 | break; |
f4530fa5 | 98 | case RT_TABLE_MAIN: |
a7e53531 | 99 | rcu_assign_pointer(net->ipv4.fib_main, tb); |
f4530fa5 | 100 | break; |
f4530fa5 | 101 | case RT_TABLE_DEFAULT: |
a7e53531 | 102 | rcu_assign_pointer(net->ipv4.fib_default, tb); |
f4530fa5 | 103 | break; |
f4530fa5 DM |
104 | default: |
105 | break; | |
106 | } | |
107 | ||
1af5a8c4 | 108 | h = id & (FIB_TABLE_HASHSZ - 1); |
e4aef8ae | 109 | hlist_add_head_rcu(&tb->tb_hlist, &net->ipv4.fib_table_hash[h]); |
1da177e4 LT |
110 | return tb; |
111 | } | |
112 | ||
345e9b54 | 113 | /* caller must hold either rtnl or rcu read lock */ |
8ad4942c | 114 | struct fib_table *fib_get_table(struct net *net, u32 id) |
1af5a8c4 PM |
115 | { |
116 | struct fib_table *tb; | |
e4aef8ae | 117 | struct hlist_head *head; |
1af5a8c4 | 118 | unsigned int h; |
1da177e4 | 119 | |
1af5a8c4 PM |
120 | if (id == 0) |
121 | id = RT_TABLE_MAIN; | |
122 | h = id & (FIB_TABLE_HASHSZ - 1); | |
e4aef8ae | 123 | |
e4aef8ae | 124 | head = &net->ipv4.fib_table_hash[h]; |
b67bfe0d | 125 | hlist_for_each_entry_rcu(tb, head, tb_hlist) { |
345e9b54 | 126 | if (tb->tb_id == id) |
1af5a8c4 | 127 | return tb; |
1af5a8c4 | 128 | } |
1af5a8c4 PM |
129 | return NULL; |
130 | } | |
1da177e4 LT |
131 | #endif /* CONFIG_IP_MULTIPLE_TABLES */ |
132 | ||
0ddcf43d AD |
133 | static void fib_replace_table(struct net *net, struct fib_table *old, |
134 | struct fib_table *new) | |
135 | { | |
136 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
137 | switch (new->tb_id) { | |
138 | case RT_TABLE_LOCAL: | |
139 | rcu_assign_pointer(net->ipv4.fib_local, new); | |
140 | break; | |
141 | case RT_TABLE_MAIN: | |
142 | rcu_assign_pointer(net->ipv4.fib_main, new); | |
143 | break; | |
144 | case RT_TABLE_DEFAULT: | |
145 | rcu_assign_pointer(net->ipv4.fib_default, new); | |
146 | break; | |
147 | default: | |
148 | break; | |
149 | } | |
150 | ||
151 | #endif | |
152 | /* replace the old table in the hlist */ | |
153 | hlist_replace_rcu(&old->tb_hlist, &new->tb_hlist); | |
154 | } | |
155 | ||
156 | int fib_unmerge(struct net *net) | |
157 | { | |
158 | struct fib_table *old, *new; | |
159 | ||
3c9e9f73 | 160 | /* attempt to fetch local table if it has been allocated */ |
0ddcf43d | 161 | old = fib_get_table(net, RT_TABLE_LOCAL); |
3c9e9f73 AD |
162 | if (!old) |
163 | return 0; | |
0ddcf43d | 164 | |
3c9e9f73 | 165 | new = fib_trie_unmerge(old); |
0ddcf43d AD |
166 | if (!new) |
167 | return -ENOMEM; | |
168 | ||
169 | /* replace merged table with clean table */ | |
170 | if (new != old) { | |
171 | fib_replace_table(net, old, new); | |
172 | fib_free_table(old); | |
173 | } | |
174 | ||
175 | return 0; | |
176 | } | |
177 | ||
e4aef8ae | 178 | static void fib_flush(struct net *net) |
1da177e4 LT |
179 | { |
180 | int flushed = 0; | |
1af5a8c4 | 181 | unsigned int h; |
1da177e4 | 182 | |
1af5a8c4 | 183 | for (h = 0; h < FIB_TABLE_HASHSZ; h++) { |
a7e53531 AD |
184 | struct hlist_head *head = &net->ipv4.fib_table_hash[h]; |
185 | struct hlist_node *tmp; | |
186 | struct fib_table *tb; | |
187 | ||
188 | hlist_for_each_entry_safe(tb, tmp, head, tb_hlist) | |
16c6cf8b | 189 | flushed += fib_table_flush(tb); |
1da177e4 | 190 | } |
1da177e4 LT |
191 | |
192 | if (flushed) | |
4ccfe6d4 | 193 | rt_cache_flush(net); |
1da177e4 LT |
194 | } |
195 | ||
104616e7 SF |
196 | void fib_flush_external(struct net *net) |
197 | { | |
198 | struct fib_table *tb; | |
199 | struct hlist_head *head; | |
200 | unsigned int h; | |
201 | ||
202 | for (h = 0; h < FIB_TABLE_HASHSZ; h++) { | |
203 | head = &net->ipv4.fib_table_hash[h]; | |
204 | hlist_for_each_entry(tb, head, tb_hlist) | |
205 | fib_table_flush_external(tb); | |
206 | } | |
207 | } | |
208 | ||
05538116 LAT |
209 | /* |
210 | * Find address type as if only "dev" was present in the system. If | |
211 | * on_dev is NULL then all interfaces are taken into consideration. | |
212 | */ | |
95c96174 ED |
213 | static inline unsigned int __inet_dev_addr_type(struct net *net, |
214 | const struct net_device *dev, | |
15be405e | 215 | __be32 addr, int tb_id) |
1da177e4 | 216 | { |
9ade2286 | 217 | struct flowi4 fl4 = { .daddr = addr }; |
1da177e4 | 218 | struct fib_result res; |
95c96174 | 219 | unsigned int ret = RTN_BROADCAST; |
15be405e | 220 | struct fib_table *table; |
1da177e4 | 221 | |
1e637c74 | 222 | if (ipv4_is_zeronet(addr) || ipv4_is_lbcast(addr)) |
1da177e4 | 223 | return RTN_BROADCAST; |
f97c1e0c | 224 | if (ipv4_is_multicast(addr)) |
1da177e4 LT |
225 | return RTN_MULTICAST; |
226 | ||
345e9b54 AD |
227 | rcu_read_lock(); |
228 | ||
15be405e DA |
229 | table = fib_get_table(net, tb_id); |
230 | if (table) { | |
1da177e4 | 231 | ret = RTN_UNICAST; |
15be405e | 232 | if (!fib_table_lookup(table, &fl4, &res, FIB_LOOKUP_NOREF)) { |
05538116 LAT |
233 | if (!dev || dev == res.fi->fib_dev) |
234 | ret = res.type; | |
1da177e4 LT |
235 | } |
236 | } | |
345e9b54 AD |
237 | |
238 | rcu_read_unlock(); | |
1da177e4 LT |
239 | return ret; |
240 | } | |
241 | ||
15be405e DA |
242 | unsigned int inet_addr_type_table(struct net *net, __be32 addr, int tb_id) |
243 | { | |
244 | return __inet_dev_addr_type(net, NULL, addr, tb_id); | |
245 | } | |
246 | EXPORT_SYMBOL(inet_addr_type_table); | |
247 | ||
6b175b26 | 248 | unsigned int inet_addr_type(struct net *net, __be32 addr) |
05538116 | 249 | { |
15be405e | 250 | return __inet_dev_addr_type(net, NULL, addr, RT_TABLE_LOCAL); |
05538116 | 251 | } |
4bc2f18b | 252 | EXPORT_SYMBOL(inet_addr_type); |
05538116 | 253 | |
6b175b26 EB |
254 | unsigned int inet_dev_addr_type(struct net *net, const struct net_device *dev, |
255 | __be32 addr) | |
05538116 | 256 | { |
15be405e DA |
257 | int rt_table = vrf_dev_table(dev) ? : RT_TABLE_LOCAL; |
258 | ||
259 | return __inet_dev_addr_type(net, dev, addr, rt_table); | |
05538116 | 260 | } |
4bc2f18b | 261 | EXPORT_SYMBOL(inet_dev_addr_type); |
05538116 | 262 | |
30bbaa19 DA |
263 | /* inet_addr_type with dev == NULL but using the table from a dev |
264 | * if one is associated | |
265 | */ | |
266 | unsigned int inet_addr_type_dev_table(struct net *net, | |
267 | const struct net_device *dev, | |
268 | __be32 addr) | |
269 | { | |
270 | int rt_table = vrf_dev_table(dev) ? : RT_TABLE_LOCAL; | |
271 | ||
272 | return __inet_dev_addr_type(net, NULL, addr, rt_table); | |
273 | } | |
274 | EXPORT_SYMBOL(inet_addr_type_dev_table); | |
275 | ||
35ebf65e DM |
276 | __be32 fib_compute_spec_dst(struct sk_buff *skb) |
277 | { | |
278 | struct net_device *dev = skb->dev; | |
279 | struct in_device *in_dev; | |
280 | struct fib_result res; | |
a207a4b2 | 281 | struct rtable *rt; |
35ebf65e DM |
282 | struct flowi4 fl4; |
283 | struct net *net; | |
a207a4b2 | 284 | int scope; |
35ebf65e | 285 | |
a207a4b2 | 286 | rt = skb_rtable(skb); |
0cc535a2 JA |
287 | if ((rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST | RTCF_LOCAL)) == |
288 | RTCF_LOCAL) | |
35ebf65e DM |
289 | return ip_hdr(skb)->daddr; |
290 | ||
291 | in_dev = __in_dev_get_rcu(dev); | |
292 | BUG_ON(!in_dev); | |
35ebf65e DM |
293 | |
294 | net = dev_net(dev); | |
a207a4b2 DM |
295 | |
296 | scope = RT_SCOPE_UNIVERSE; | |
297 | if (!ipv4_is_zeronet(ip_hdr(skb)->saddr)) { | |
298 | fl4.flowi4_oif = 0; | |
1fb9489b | 299 | fl4.flowi4_iif = LOOPBACK_IFINDEX; |
a207a4b2 DM |
300 | fl4.daddr = ip_hdr(skb)->saddr; |
301 | fl4.saddr = 0; | |
302 | fl4.flowi4_tos = RT_TOS(ip_hdr(skb)->tos); | |
303 | fl4.flowi4_scope = scope; | |
304 | fl4.flowi4_mark = IN_DEV_SRC_VMARK(in_dev) ? skb->mark : 0; | |
1b7179d3 | 305 | fl4.flowi4_tun_key.tun_id = 0; |
0eeb075f | 306 | if (!fib_lookup(net, &fl4, &res, 0)) |
a207a4b2 DM |
307 | return FIB_RES_PREFSRC(net, res); |
308 | } else { | |
309 | scope = RT_SCOPE_LINK; | |
310 | } | |
311 | ||
312 | return inet_select_addr(dev, ip_hdr(skb)->saddr, scope); | |
35ebf65e DM |
313 | } |
314 | ||
1da177e4 | 315 | /* Given (packet source, input interface) and optional (dst, oif, tos): |
6a31d2a9 ED |
316 | * - (main) check, that source is valid i.e. not broadcast or our local |
317 | * address. | |
318 | * - figure out what "logical" interface this packet arrived | |
319 | * and calculate "specific destination" address. | |
320 | * - check, that packet arrived from expected physical interface. | |
ebc0ffae | 321 | * called with rcu_read_lock() |
1da177e4 | 322 | */ |
7a9bc9b8 DM |
323 | static int __fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst, |
324 | u8 tos, int oif, struct net_device *dev, | |
325 | int rpf, struct in_device *idev, u32 *itag) | |
1da177e4 | 326 | { |
1dced6a8 | 327 | int ret, no_addr; |
1da177e4 | 328 | struct fib_result res; |
9e56e380 | 329 | struct flowi4 fl4; |
5b707aaa | 330 | struct net *net; |
9e56e380 | 331 | bool dev_match; |
1da177e4 | 332 | |
9ade2286 | 333 | fl4.flowi4_oif = 0; |
cd2fbe1b DA |
334 | fl4.flowi4_iif = vrf_master_ifindex_rcu(dev); |
335 | if (!fl4.flowi4_iif) | |
336 | fl4.flowi4_iif = oif ? : LOOPBACK_IFINDEX; | |
9ade2286 DM |
337 | fl4.daddr = src; |
338 | fl4.saddr = dst; | |
339 | fl4.flowi4_tos = tos; | |
340 | fl4.flowi4_scope = RT_SCOPE_UNIVERSE; | |
1b7179d3 | 341 | fl4.flowi4_tun_key.tun_id = 0; |
cc7e17ea | 342 | |
9e56e380 | 343 | no_addr = idev->ifa_list == NULL; |
990078af | 344 | |
9e56e380 | 345 | fl4.flowi4_mark = IN_DEV_SRC_VMARK(idev) ? skb->mark : 0; |
1da177e4 | 346 | |
c346dca1 | 347 | net = dev_net(dev); |
0eeb075f | 348 | if (fib_lookup(net, &fl4, &res, 0)) |
1da177e4 | 349 | goto last_resort; |
1dced6a8 SB |
350 | if (res.type != RTN_UNICAST && |
351 | (res.type != RTN_LOCAL || !IN_DEV_ACCEPT_LOCAL(idev))) | |
352 | goto e_inval; | |
353 | if (!rpf && !fib_num_tclassid_users(dev_net(dev)) && | |
354 | (dev->ifindex != oif || !IN_DEV_TX_REDIRECTS(idev))) | |
355 | goto last_resort; | |
1da177e4 | 356 | fib_combine_itag(itag, &res); |
6f86b325 DM |
357 | dev_match = false; |
358 | ||
1da177e4 | 359 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
6f86b325 DM |
360 | for (ret = 0; ret < res.fi->fib_nhs; ret++) { |
361 | struct fib_nh *nh = &res.fi->fib_nh[ret]; | |
362 | ||
363 | if (nh->nh_dev == dev) { | |
364 | dev_match = true; | |
365 | break; | |
cd2fbe1b DA |
366 | } else if (vrf_master_ifindex_rcu(nh->nh_dev) == dev->ifindex) { |
367 | dev_match = true; | |
368 | break; | |
6f86b325 DM |
369 | } |
370 | } | |
1da177e4 LT |
371 | #else |
372 | if (FIB_RES_DEV(res) == dev) | |
6f86b325 | 373 | dev_match = true; |
1da177e4 | 374 | #endif |
6f86b325 | 375 | if (dev_match) { |
1da177e4 | 376 | ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST; |
1da177e4 LT |
377 | return ret; |
378 | } | |
1da177e4 LT |
379 | if (no_addr) |
380 | goto last_resort; | |
c1cf8422 | 381 | if (rpf == 1) |
b5f7e755 | 382 | goto e_rpf; |
9ade2286 | 383 | fl4.flowi4_oif = dev->ifindex; |
1da177e4 LT |
384 | |
385 | ret = 0; | |
0eeb075f | 386 | if (fib_lookup(net, &fl4, &res, FIB_LOOKUP_IGNORE_LINKSTATE) == 0) { |
41347dcd | 387 | if (res.type == RTN_UNICAST) |
1da177e4 | 388 | ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST; |
1da177e4 LT |
389 | } |
390 | return ret; | |
391 | ||
392 | last_resort: | |
393 | if (rpf) | |
b5f7e755 | 394 | goto e_rpf; |
1da177e4 LT |
395 | *itag = 0; |
396 | return 0; | |
397 | ||
1da177e4 LT |
398 | e_inval: |
399 | return -EINVAL; | |
b5f7e755 ED |
400 | e_rpf: |
401 | return -EXDEV; | |
1da177e4 LT |
402 | } |
403 | ||
7a9bc9b8 DM |
404 | /* Ignore rp_filter for packets protected by IPsec. */ |
405 | int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst, | |
406 | u8 tos, int oif, struct net_device *dev, | |
407 | struct in_device *idev, u32 *itag) | |
408 | { | |
409 | int r = secpath_exists(skb) ? 0 : IN_DEV_RPFILTER(idev); | |
410 | ||
e81da0e1 | 411 | if (!r && !fib_num_tclassid_users(dev_net(dev)) && |
1dced6a8 | 412 | IN_DEV_ACCEPT_LOCAL(idev) && |
e81da0e1 | 413 | (dev->ifindex != oif || !IN_DEV_TX_REDIRECTS(idev))) { |
7a9bc9b8 DM |
414 | *itag = 0; |
415 | return 0; | |
416 | } | |
417 | return __fib_validate_source(skb, src, dst, tos, oif, dev, r, idev, itag); | |
418 | } | |
419 | ||
81f7bf6c | 420 | static inline __be32 sk_extract_addr(struct sockaddr *addr) |
4e902c57 TG |
421 | { |
422 | return ((struct sockaddr_in *) addr)->sin_addr.s_addr; | |
423 | } | |
424 | ||
425 | static int put_rtax(struct nlattr *mx, int len, int type, u32 value) | |
426 | { | |
427 | struct nlattr *nla; | |
428 | ||
429 | nla = (struct nlattr *) ((char *) mx + len); | |
430 | nla->nla_type = type; | |
431 | nla->nla_len = nla_attr_size(4); | |
432 | *(u32 *) nla_data(nla) = value; | |
433 | ||
434 | return len + nla_total_size(4); | |
435 | } | |
436 | ||
4b5d47d4 | 437 | static int rtentry_to_fib_config(struct net *net, int cmd, struct rtentry *rt, |
4e902c57 TG |
438 | struct fib_config *cfg) |
439 | { | |
6d85c10a | 440 | __be32 addr; |
4e902c57 TG |
441 | int plen; |
442 | ||
443 | memset(cfg, 0, sizeof(*cfg)); | |
4b5d47d4 | 444 | cfg->fc_nlinfo.nl_net = net; |
4e902c57 TG |
445 | |
446 | if (rt->rt_dst.sa_family != AF_INET) | |
447 | return -EAFNOSUPPORT; | |
448 | ||
449 | /* | |
450 | * Check mask for validity: | |
451 | * a) it must be contiguous. | |
452 | * b) destination must have all host bits clear. | |
453 | * c) if application forgot to set correct family (AF_INET), | |
454 | * reject request unless it is absolutely clear i.e. | |
455 | * both family and mask are zero. | |
456 | */ | |
457 | plen = 32; | |
458 | addr = sk_extract_addr(&rt->rt_dst); | |
459 | if (!(rt->rt_flags & RTF_HOST)) { | |
81f7bf6c | 460 | __be32 mask = sk_extract_addr(&rt->rt_genmask); |
4e902c57 TG |
461 | |
462 | if (rt->rt_genmask.sa_family != AF_INET) { | |
463 | if (mask || rt->rt_genmask.sa_family) | |
464 | return -EAFNOSUPPORT; | |
465 | } | |
466 | ||
467 | if (bad_mask(mask, addr)) | |
468 | return -EINVAL; | |
469 | ||
470 | plen = inet_mask_len(mask); | |
471 | } | |
472 | ||
473 | cfg->fc_dst_len = plen; | |
474 | cfg->fc_dst = addr; | |
475 | ||
476 | if (cmd != SIOCDELRT) { | |
477 | cfg->fc_nlflags = NLM_F_CREATE; | |
478 | cfg->fc_protocol = RTPROT_BOOT; | |
479 | } | |
480 | ||
481 | if (rt->rt_metric) | |
482 | cfg->fc_priority = rt->rt_metric - 1; | |
483 | ||
484 | if (rt->rt_flags & RTF_REJECT) { | |
485 | cfg->fc_scope = RT_SCOPE_HOST; | |
486 | cfg->fc_type = RTN_UNREACHABLE; | |
487 | return 0; | |
488 | } | |
489 | ||
490 | cfg->fc_scope = RT_SCOPE_NOWHERE; | |
491 | cfg->fc_type = RTN_UNICAST; | |
492 | ||
493 | if (rt->rt_dev) { | |
494 | char *colon; | |
495 | struct net_device *dev; | |
496 | char devname[IFNAMSIZ]; | |
497 | ||
498 | if (copy_from_user(devname, rt->rt_dev, IFNAMSIZ-1)) | |
499 | return -EFAULT; | |
500 | ||
501 | devname[IFNAMSIZ-1] = 0; | |
502 | colon = strchr(devname, ':'); | |
503 | if (colon) | |
504 | *colon = 0; | |
4b5d47d4 | 505 | dev = __dev_get_by_name(net, devname); |
4e902c57 TG |
506 | if (!dev) |
507 | return -ENODEV; | |
508 | cfg->fc_oif = dev->ifindex; | |
509 | if (colon) { | |
510 | struct in_ifaddr *ifa; | |
511 | struct in_device *in_dev = __in_dev_get_rtnl(dev); | |
512 | if (!in_dev) | |
513 | return -ENODEV; | |
514 | *colon = ':'; | |
515 | for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) | |
516 | if (strcmp(ifa->ifa_label, devname) == 0) | |
517 | break; | |
51456b29 | 518 | if (!ifa) |
4e902c57 TG |
519 | return -ENODEV; |
520 | cfg->fc_prefsrc = ifa->ifa_local; | |
521 | } | |
522 | } | |
523 | ||
524 | addr = sk_extract_addr(&rt->rt_gateway); | |
525 | if (rt->rt_gateway.sa_family == AF_INET && addr) { | |
30bbaa19 DA |
526 | unsigned int addr_type; |
527 | ||
4e902c57 | 528 | cfg->fc_gw = addr; |
30bbaa19 | 529 | addr_type = inet_addr_type_table(net, addr, cfg->fc_table); |
4e902c57 | 530 | if (rt->rt_flags & RTF_GATEWAY && |
30bbaa19 | 531 | addr_type == RTN_UNICAST) |
4e902c57 TG |
532 | cfg->fc_scope = RT_SCOPE_UNIVERSE; |
533 | } | |
534 | ||
535 | if (cmd == SIOCDELRT) | |
536 | return 0; | |
537 | ||
538 | if (rt->rt_flags & RTF_GATEWAY && !cfg->fc_gw) | |
539 | return -EINVAL; | |
540 | ||
541 | if (cfg->fc_scope == RT_SCOPE_NOWHERE) | |
542 | cfg->fc_scope = RT_SCOPE_LINK; | |
543 | ||
544 | if (rt->rt_flags & (RTF_MTU | RTF_WINDOW | RTF_IRTT)) { | |
545 | struct nlattr *mx; | |
546 | int len = 0; | |
547 | ||
548 | mx = kzalloc(3 * nla_total_size(4), GFP_KERNEL); | |
51456b29 | 549 | if (!mx) |
4e902c57 TG |
550 | return -ENOMEM; |
551 | ||
552 | if (rt->rt_flags & RTF_MTU) | |
553 | len = put_rtax(mx, len, RTAX_ADVMSS, rt->rt_mtu - 40); | |
554 | ||
555 | if (rt->rt_flags & RTF_WINDOW) | |
556 | len = put_rtax(mx, len, RTAX_WINDOW, rt->rt_window); | |
557 | ||
558 | if (rt->rt_flags & RTF_IRTT) | |
559 | len = put_rtax(mx, len, RTAX_RTT, rt->rt_irtt << 3); | |
560 | ||
561 | cfg->fc_mx = mx; | |
562 | cfg->fc_mx_len = len; | |
563 | } | |
564 | ||
565 | return 0; | |
566 | } | |
567 | ||
1da177e4 | 568 | /* |
6a31d2a9 ED |
569 | * Handle IP routing ioctl calls. |
570 | * These are used to manipulate the routing tables | |
1da177e4 | 571 | */ |
1bad118a | 572 | int ip_rt_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
1da177e4 | 573 | { |
4e902c57 TG |
574 | struct fib_config cfg; |
575 | struct rtentry rt; | |
1da177e4 | 576 | int err; |
1da177e4 LT |
577 | |
578 | switch (cmd) { | |
579 | case SIOCADDRT: /* Add a route */ | |
580 | case SIOCDELRT: /* Delete a route */ | |
52e804c6 | 581 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 | 582 | return -EPERM; |
4e902c57 TG |
583 | |
584 | if (copy_from_user(&rt, arg, sizeof(rt))) | |
1da177e4 | 585 | return -EFAULT; |
4e902c57 | 586 | |
1da177e4 | 587 | rtnl_lock(); |
1bad118a | 588 | err = rtentry_to_fib_config(net, cmd, &rt, &cfg); |
1da177e4 | 589 | if (err == 0) { |
4e902c57 TG |
590 | struct fib_table *tb; |
591 | ||
1da177e4 | 592 | if (cmd == SIOCDELRT) { |
1bad118a | 593 | tb = fib_get_table(net, cfg.fc_table); |
1da177e4 | 594 | if (tb) |
16c6cf8b | 595 | err = fib_table_delete(tb, &cfg); |
4e902c57 TG |
596 | else |
597 | err = -ESRCH; | |
1da177e4 | 598 | } else { |
1bad118a | 599 | tb = fib_new_table(net, cfg.fc_table); |
1da177e4 | 600 | if (tb) |
16c6cf8b | 601 | err = fib_table_insert(tb, &cfg); |
4e902c57 TG |
602 | else |
603 | err = -ENOBUFS; | |
1da177e4 | 604 | } |
4e902c57 TG |
605 | |
606 | /* allocated by rtentry_to_fib_config() */ | |
607 | kfree(cfg.fc_mx); | |
1da177e4 LT |
608 | } |
609 | rtnl_unlock(); | |
610 | return err; | |
611 | } | |
612 | return -EINVAL; | |
613 | } | |
614 | ||
6a31d2a9 | 615 | const struct nla_policy rtm_ipv4_policy[RTA_MAX + 1] = { |
4e902c57 TG |
616 | [RTA_DST] = { .type = NLA_U32 }, |
617 | [RTA_SRC] = { .type = NLA_U32 }, | |
618 | [RTA_IIF] = { .type = NLA_U32 }, | |
619 | [RTA_OIF] = { .type = NLA_U32 }, | |
620 | [RTA_GATEWAY] = { .type = NLA_U32 }, | |
621 | [RTA_PRIORITY] = { .type = NLA_U32 }, | |
622 | [RTA_PREFSRC] = { .type = NLA_U32 }, | |
623 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
5176f91e | 624 | [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) }, |
4e902c57 | 625 | [RTA_FLOW] = { .type = NLA_U32 }, |
571e7226 RP |
626 | [RTA_ENCAP_TYPE] = { .type = NLA_U16 }, |
627 | [RTA_ENCAP] = { .type = NLA_NESTED }, | |
4e902c57 TG |
628 | }; |
629 | ||
4b5d47d4 | 630 | static int rtm_to_fib_config(struct net *net, struct sk_buff *skb, |
6a31d2a9 | 631 | struct nlmsghdr *nlh, struct fib_config *cfg) |
1da177e4 | 632 | { |
4e902c57 TG |
633 | struct nlattr *attr; |
634 | int err, remaining; | |
635 | struct rtmsg *rtm; | |
636 | ||
637 | err = nlmsg_validate(nlh, sizeof(*rtm), RTA_MAX, rtm_ipv4_policy); | |
638 | if (err < 0) | |
639 | goto errout; | |
640 | ||
641 | memset(cfg, 0, sizeof(*cfg)); | |
642 | ||
643 | rtm = nlmsg_data(nlh); | |
4e902c57 | 644 | cfg->fc_dst_len = rtm->rtm_dst_len; |
4e902c57 TG |
645 | cfg->fc_tos = rtm->rtm_tos; |
646 | cfg->fc_table = rtm->rtm_table; | |
647 | cfg->fc_protocol = rtm->rtm_protocol; | |
648 | cfg->fc_scope = rtm->rtm_scope; | |
649 | cfg->fc_type = rtm->rtm_type; | |
650 | cfg->fc_flags = rtm->rtm_flags; | |
651 | cfg->fc_nlflags = nlh->nlmsg_flags; | |
652 | ||
15e47304 | 653 | cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid; |
4e902c57 | 654 | cfg->fc_nlinfo.nlh = nlh; |
4b5d47d4 | 655 | cfg->fc_nlinfo.nl_net = net; |
4e902c57 | 656 | |
a0ee18b9 TG |
657 | if (cfg->fc_type > RTN_MAX) { |
658 | err = -EINVAL; | |
659 | goto errout; | |
660 | } | |
661 | ||
4e902c57 | 662 | nlmsg_for_each_attr(attr, nlh, sizeof(struct rtmsg), remaining) { |
8f4c1f9b | 663 | switch (nla_type(attr)) { |
4e902c57 | 664 | case RTA_DST: |
17fb2c64 | 665 | cfg->fc_dst = nla_get_be32(attr); |
4e902c57 | 666 | break; |
4e902c57 TG |
667 | case RTA_OIF: |
668 | cfg->fc_oif = nla_get_u32(attr); | |
669 | break; | |
670 | case RTA_GATEWAY: | |
17fb2c64 | 671 | cfg->fc_gw = nla_get_be32(attr); |
4e902c57 TG |
672 | break; |
673 | case RTA_PRIORITY: | |
674 | cfg->fc_priority = nla_get_u32(attr); | |
675 | break; | |
676 | case RTA_PREFSRC: | |
17fb2c64 | 677 | cfg->fc_prefsrc = nla_get_be32(attr); |
4e902c57 TG |
678 | break; |
679 | case RTA_METRICS: | |
680 | cfg->fc_mx = nla_data(attr); | |
681 | cfg->fc_mx_len = nla_len(attr); | |
682 | break; | |
683 | case RTA_MULTIPATH: | |
684 | cfg->fc_mp = nla_data(attr); | |
685 | cfg->fc_mp_len = nla_len(attr); | |
686 | break; | |
687 | case RTA_FLOW: | |
688 | cfg->fc_flow = nla_get_u32(attr); | |
689 | break; | |
4e902c57 TG |
690 | case RTA_TABLE: |
691 | cfg->fc_table = nla_get_u32(attr); | |
692 | break; | |
571e7226 RP |
693 | case RTA_ENCAP: |
694 | cfg->fc_encap = attr; | |
695 | break; | |
696 | case RTA_ENCAP_TYPE: | |
697 | cfg->fc_encap_type = nla_get_u16(attr); | |
698 | break; | |
1da177e4 LT |
699 | } |
700 | } | |
4e902c57 | 701 | |
1da177e4 | 702 | return 0; |
4e902c57 TG |
703 | errout: |
704 | return err; | |
1da177e4 LT |
705 | } |
706 | ||
661d2967 | 707 | static int inet_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh) |
1da177e4 | 708 | { |
3b1e0a65 | 709 | struct net *net = sock_net(skb->sk); |
4e902c57 TG |
710 | struct fib_config cfg; |
711 | struct fib_table *tb; | |
712 | int err; | |
1da177e4 | 713 | |
4b5d47d4 | 714 | err = rtm_to_fib_config(net, skb, nlh, &cfg); |
4e902c57 TG |
715 | if (err < 0) |
716 | goto errout; | |
1da177e4 | 717 | |
8ad4942c | 718 | tb = fib_get_table(net, cfg.fc_table); |
51456b29 | 719 | if (!tb) { |
4e902c57 TG |
720 | err = -ESRCH; |
721 | goto errout; | |
722 | } | |
723 | ||
16c6cf8b | 724 | err = fib_table_delete(tb, &cfg); |
4e902c57 TG |
725 | errout: |
726 | return err; | |
1da177e4 LT |
727 | } |
728 | ||
661d2967 | 729 | static int inet_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh) |
1da177e4 | 730 | { |
3b1e0a65 | 731 | struct net *net = sock_net(skb->sk); |
4e902c57 TG |
732 | struct fib_config cfg; |
733 | struct fib_table *tb; | |
734 | int err; | |
1da177e4 | 735 | |
4b5d47d4 | 736 | err = rtm_to_fib_config(net, skb, nlh, &cfg); |
4e902c57 TG |
737 | if (err < 0) |
738 | goto errout; | |
1da177e4 | 739 | |
226b0b4a | 740 | tb = fib_new_table(net, cfg.fc_table); |
51456b29 | 741 | if (!tb) { |
4e902c57 TG |
742 | err = -ENOBUFS; |
743 | goto errout; | |
744 | } | |
745 | ||
16c6cf8b | 746 | err = fib_table_insert(tb, &cfg); |
4e902c57 TG |
747 | errout: |
748 | return err; | |
1da177e4 LT |
749 | } |
750 | ||
63f3444f | 751 | static int inet_dump_fib(struct sk_buff *skb, struct netlink_callback *cb) |
1da177e4 | 752 | { |
3b1e0a65 | 753 | struct net *net = sock_net(skb->sk); |
1af5a8c4 PM |
754 | unsigned int h, s_h; |
755 | unsigned int e = 0, s_e; | |
1da177e4 | 756 | struct fib_table *tb; |
e4aef8ae | 757 | struct hlist_head *head; |
1af5a8c4 | 758 | int dumped = 0; |
1da177e4 | 759 | |
be403ea1 TG |
760 | if (nlmsg_len(cb->nlh) >= sizeof(struct rtmsg) && |
761 | ((struct rtmsg *) nlmsg_data(cb->nlh))->rtm_flags & RTM_F_CLONED) | |
0b8c7f6f | 762 | return skb->len; |
1da177e4 | 763 | |
1af5a8c4 PM |
764 | s_h = cb->args[0]; |
765 | s_e = cb->args[1]; | |
766 | ||
a7e53531 AD |
767 | rcu_read_lock(); |
768 | ||
1af5a8c4 PM |
769 | for (h = s_h; h < FIB_TABLE_HASHSZ; h++, s_e = 0) { |
770 | e = 0; | |
e4aef8ae | 771 | head = &net->ipv4.fib_table_hash[h]; |
a7e53531 | 772 | hlist_for_each_entry_rcu(tb, head, tb_hlist) { |
1af5a8c4 PM |
773 | if (e < s_e) |
774 | goto next; | |
775 | if (dumped) | |
776 | memset(&cb->args[2], 0, sizeof(cb->args) - | |
e905a9ed | 777 | 2 * sizeof(cb->args[0])); |
16c6cf8b | 778 | if (fib_table_dump(tb, skb, cb) < 0) |
1af5a8c4 PM |
779 | goto out; |
780 | dumped = 1; | |
781 | next: | |
782 | e++; | |
783 | } | |
1da177e4 | 784 | } |
1af5a8c4 | 785 | out: |
a7e53531 AD |
786 | rcu_read_unlock(); |
787 | ||
1af5a8c4 PM |
788 | cb->args[1] = e; |
789 | cb->args[0] = h; | |
1da177e4 LT |
790 | |
791 | return skb->len; | |
792 | } | |
793 | ||
794 | /* Prepare and feed intra-kernel routing request. | |
6a31d2a9 ED |
795 | * Really, it should be netlink message, but :-( netlink |
796 | * can be not configured, so that we feed it directly | |
797 | * to fib engine. It is legal, because all events occur | |
798 | * only when netlink is already locked. | |
1da177e4 | 799 | */ |
81f7bf6c | 800 | static void fib_magic(int cmd, int type, __be32 dst, int dst_len, struct in_ifaddr *ifa) |
1da177e4 | 801 | { |
c346dca1 | 802 | struct net *net = dev_net(ifa->ifa_dev->dev); |
021dd3b8 | 803 | int tb_id = vrf_dev_table_rtnl(ifa->ifa_dev->dev); |
4e902c57 TG |
804 | struct fib_table *tb; |
805 | struct fib_config cfg = { | |
806 | .fc_protocol = RTPROT_KERNEL, | |
807 | .fc_type = type, | |
808 | .fc_dst = dst, | |
809 | .fc_dst_len = dst_len, | |
810 | .fc_prefsrc = ifa->ifa_local, | |
811 | .fc_oif = ifa->ifa_dev->dev->ifindex, | |
812 | .fc_nlflags = NLM_F_CREATE | NLM_F_APPEND, | |
4d1169c1 | 813 | .fc_nlinfo = { |
4b5d47d4 | 814 | .nl_net = net, |
4d1169c1 | 815 | }, |
4e902c57 | 816 | }; |
1da177e4 | 817 | |
021dd3b8 DA |
818 | if (!tb_id) |
819 | tb_id = (type == RTN_UNICAST) ? RT_TABLE_MAIN : RT_TABLE_LOCAL; | |
1da177e4 | 820 | |
021dd3b8 | 821 | tb = fib_new_table(net, tb_id); |
51456b29 | 822 | if (!tb) |
1da177e4 LT |
823 | return; |
824 | ||
4e902c57 | 825 | cfg.fc_table = tb->tb_id; |
1da177e4 | 826 | |
4e902c57 TG |
827 | if (type != RTN_LOCAL) |
828 | cfg.fc_scope = RT_SCOPE_LINK; | |
829 | else | |
830 | cfg.fc_scope = RT_SCOPE_HOST; | |
1da177e4 LT |
831 | |
832 | if (cmd == RTM_NEWROUTE) | |
16c6cf8b | 833 | fib_table_insert(tb, &cfg); |
1da177e4 | 834 | else |
16c6cf8b | 835 | fib_table_delete(tb, &cfg); |
1da177e4 LT |
836 | } |
837 | ||
0ff60a45 | 838 | void fib_add_ifaddr(struct in_ifaddr *ifa) |
1da177e4 LT |
839 | { |
840 | struct in_device *in_dev = ifa->ifa_dev; | |
841 | struct net_device *dev = in_dev->dev; | |
842 | struct in_ifaddr *prim = ifa; | |
a144ea4b AV |
843 | __be32 mask = ifa->ifa_mask; |
844 | __be32 addr = ifa->ifa_local; | |
6a31d2a9 | 845 | __be32 prefix = ifa->ifa_address & mask; |
1da177e4 | 846 | |
6a31d2a9 | 847 | if (ifa->ifa_flags & IFA_F_SECONDARY) { |
1da177e4 | 848 | prim = inet_ifa_byprefix(in_dev, prefix, mask); |
51456b29 | 849 | if (!prim) { |
058bd4d2 | 850 | pr_warn("%s: bug: prim == NULL\n", __func__); |
1da177e4 LT |
851 | return; |
852 | } | |
853 | } | |
854 | ||
855 | fib_magic(RTM_NEWROUTE, RTN_LOCAL, addr, 32, prim); | |
856 | ||
6a31d2a9 | 857 | if (!(dev->flags & IFF_UP)) |
1da177e4 LT |
858 | return; |
859 | ||
860 | /* Add broadcast address, if it is explicitly assigned. */ | |
a144ea4b | 861 | if (ifa->ifa_broadcast && ifa->ifa_broadcast != htonl(0xFFFFFFFF)) |
1da177e4 LT |
862 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim); |
863 | ||
6a31d2a9 | 864 | if (!ipv4_is_zeronet(prefix) && !(ifa->ifa_flags & IFA_F_SECONDARY) && |
1da177e4 | 865 | (prefix != addr || ifa->ifa_prefixlen < 32)) { |
6a31d2a9 ED |
866 | fib_magic(RTM_NEWROUTE, |
867 | dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST, | |
868 | prefix, ifa->ifa_prefixlen, prim); | |
1da177e4 LT |
869 | |
870 | /* Add network specific broadcasts, when it takes a sense */ | |
871 | if (ifa->ifa_prefixlen < 31) { | |
872 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix, 32, prim); | |
6a31d2a9 ED |
873 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix | ~mask, |
874 | 32, prim); | |
1da177e4 LT |
875 | } |
876 | } | |
877 | } | |
878 | ||
e6abbaa2 JA |
879 | /* Delete primary or secondary address. |
880 | * Optionally, on secondary address promotion consider the addresses | |
881 | * from subnet iprim as deleted, even if they are in device list. | |
882 | * In this case the secondary ifa can be in device list. | |
883 | */ | |
884 | void fib_del_ifaddr(struct in_ifaddr *ifa, struct in_ifaddr *iprim) | |
1da177e4 LT |
885 | { |
886 | struct in_device *in_dev = ifa->ifa_dev; | |
887 | struct net_device *dev = in_dev->dev; | |
888 | struct in_ifaddr *ifa1; | |
e6abbaa2 | 889 | struct in_ifaddr *prim = ifa, *prim1 = NULL; |
6a31d2a9 ED |
890 | __be32 brd = ifa->ifa_address | ~ifa->ifa_mask; |
891 | __be32 any = ifa->ifa_address & ifa->ifa_mask; | |
1da177e4 LT |
892 | #define LOCAL_OK 1 |
893 | #define BRD_OK 2 | |
894 | #define BRD0_OK 4 | |
895 | #define BRD1_OK 8 | |
95c96174 | 896 | unsigned int ok = 0; |
e6abbaa2 JA |
897 | int subnet = 0; /* Primary network */ |
898 | int gone = 1; /* Address is missing */ | |
899 | int same_prefsrc = 0; /* Another primary with same IP */ | |
1da177e4 | 900 | |
e6abbaa2 | 901 | if (ifa->ifa_flags & IFA_F_SECONDARY) { |
1da177e4 | 902 | prim = inet_ifa_byprefix(in_dev, any, ifa->ifa_mask); |
51456b29 | 903 | if (!prim) { |
058bd4d2 | 904 | pr_warn("%s: bug: prim == NULL\n", __func__); |
1da177e4 LT |
905 | return; |
906 | } | |
e6abbaa2 | 907 | if (iprim && iprim != prim) { |
058bd4d2 | 908 | pr_warn("%s: bug: iprim != prim\n", __func__); |
e6abbaa2 JA |
909 | return; |
910 | } | |
911 | } else if (!ipv4_is_zeronet(any) && | |
912 | (any != ifa->ifa_local || ifa->ifa_prefixlen < 32)) { | |
913 | fib_magic(RTM_DELROUTE, | |
914 | dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST, | |
915 | any, ifa->ifa_prefixlen, prim); | |
916 | subnet = 1; | |
1da177e4 LT |
917 | } |
918 | ||
919 | /* Deletion is more complicated than add. | |
6a31d2a9 ED |
920 | * We should take care of not to delete too much :-) |
921 | * | |
922 | * Scan address list to be sure that addresses are really gone. | |
1da177e4 LT |
923 | */ |
924 | ||
925 | for (ifa1 = in_dev->ifa_list; ifa1; ifa1 = ifa1->ifa_next) { | |
e6abbaa2 JA |
926 | if (ifa1 == ifa) { |
927 | /* promotion, keep the IP */ | |
928 | gone = 0; | |
929 | continue; | |
930 | } | |
931 | /* Ignore IFAs from our subnet */ | |
932 | if (iprim && ifa1->ifa_mask == iprim->ifa_mask && | |
933 | inet_ifa_match(ifa1->ifa_address, iprim)) | |
934 | continue; | |
935 | ||
936 | /* Ignore ifa1 if it uses different primary IP (prefsrc) */ | |
937 | if (ifa1->ifa_flags & IFA_F_SECONDARY) { | |
938 | /* Another address from our subnet? */ | |
939 | if (ifa1->ifa_mask == prim->ifa_mask && | |
940 | inet_ifa_match(ifa1->ifa_address, prim)) | |
941 | prim1 = prim; | |
942 | else { | |
943 | /* We reached the secondaries, so | |
944 | * same_prefsrc should be determined. | |
945 | */ | |
946 | if (!same_prefsrc) | |
947 | continue; | |
948 | /* Search new prim1 if ifa1 is not | |
949 | * using the current prim1 | |
950 | */ | |
951 | if (!prim1 || | |
952 | ifa1->ifa_mask != prim1->ifa_mask || | |
953 | !inet_ifa_match(ifa1->ifa_address, prim1)) | |
954 | prim1 = inet_ifa_byprefix(in_dev, | |
955 | ifa1->ifa_address, | |
956 | ifa1->ifa_mask); | |
957 | if (!prim1) | |
958 | continue; | |
959 | if (prim1->ifa_local != prim->ifa_local) | |
960 | continue; | |
961 | } | |
962 | } else { | |
963 | if (prim->ifa_local != ifa1->ifa_local) | |
964 | continue; | |
965 | prim1 = ifa1; | |
966 | if (prim != prim1) | |
967 | same_prefsrc = 1; | |
968 | } | |
1da177e4 LT |
969 | if (ifa->ifa_local == ifa1->ifa_local) |
970 | ok |= LOCAL_OK; | |
971 | if (ifa->ifa_broadcast == ifa1->ifa_broadcast) | |
972 | ok |= BRD_OK; | |
973 | if (brd == ifa1->ifa_broadcast) | |
974 | ok |= BRD1_OK; | |
975 | if (any == ifa1->ifa_broadcast) | |
976 | ok |= BRD0_OK; | |
e6abbaa2 JA |
977 | /* primary has network specific broadcasts */ |
978 | if (prim1 == ifa1 && ifa1->ifa_prefixlen < 31) { | |
979 | __be32 brd1 = ifa1->ifa_address | ~ifa1->ifa_mask; | |
980 | __be32 any1 = ifa1->ifa_address & ifa1->ifa_mask; | |
981 | ||
982 | if (!ipv4_is_zeronet(any1)) { | |
983 | if (ifa->ifa_broadcast == brd1 || | |
984 | ifa->ifa_broadcast == any1) | |
985 | ok |= BRD_OK; | |
986 | if (brd == brd1 || brd == any1) | |
987 | ok |= BRD1_OK; | |
988 | if (any == brd1 || any == any1) | |
989 | ok |= BRD0_OK; | |
990 | } | |
991 | } | |
1da177e4 LT |
992 | } |
993 | ||
6a31d2a9 | 994 | if (!(ok & BRD_OK)) |
1da177e4 | 995 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim); |
e6abbaa2 JA |
996 | if (subnet && ifa->ifa_prefixlen < 31) { |
997 | if (!(ok & BRD1_OK)) | |
998 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, brd, 32, prim); | |
999 | if (!(ok & BRD0_OK)) | |
1000 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, any, 32, prim); | |
1001 | } | |
6a31d2a9 | 1002 | if (!(ok & LOCAL_OK)) { |
30bbaa19 DA |
1003 | unsigned int addr_type; |
1004 | ||
1da177e4 LT |
1005 | fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 32, prim); |
1006 | ||
1007 | /* Check, that this local address finally disappeared. */ | |
30bbaa19 DA |
1008 | addr_type = inet_addr_type_dev_table(dev_net(dev), dev, |
1009 | ifa->ifa_local); | |
1010 | if (gone && addr_type != RTN_LOCAL) { | |
1da177e4 | 1011 | /* And the last, but not the least thing. |
6a31d2a9 ED |
1012 | * We must flush stray FIB entries. |
1013 | * | |
1014 | * First of all, we scan fib_info list searching | |
1015 | * for stray nexthop entries, then ignite fib_flush. | |
1016 | */ | |
c346dca1 YH |
1017 | if (fib_sync_down_addr(dev_net(dev), ifa->ifa_local)) |
1018 | fib_flush(dev_net(dev)); | |
1da177e4 LT |
1019 | } |
1020 | } | |
1021 | #undef LOCAL_OK | |
1022 | #undef BRD_OK | |
1023 | #undef BRD0_OK | |
1024 | #undef BRD1_OK | |
1025 | } | |
1026 | ||
345e9b54 | 1027 | static void nl_fib_lookup(struct net *net, struct fib_result_nl *frn) |
246955fe | 1028 | { |
e905a9ed | 1029 | |
246955fe | 1030 | struct fib_result res; |
9ade2286 DM |
1031 | struct flowi4 fl4 = { |
1032 | .flowi4_mark = frn->fl_mark, | |
1033 | .daddr = frn->fl_addr, | |
1034 | .flowi4_tos = frn->fl_tos, | |
1035 | .flowi4_scope = frn->fl_scope, | |
6a31d2a9 | 1036 | }; |
345e9b54 AD |
1037 | struct fib_table *tb; |
1038 | ||
1039 | rcu_read_lock(); | |
1040 | ||
1041 | tb = fib_get_table(net, frn->tb_id_in); | |
1194ed0a AK |
1042 | |
1043 | frn->err = -ENOENT; | |
246955fe RO |
1044 | if (tb) { |
1045 | local_bh_disable(); | |
1046 | ||
1047 | frn->tb_id = tb->tb_id; | |
9ade2286 | 1048 | frn->err = fib_table_lookup(tb, &fl4, &res, FIB_LOOKUP_NOREF); |
246955fe RO |
1049 | |
1050 | if (!frn->err) { | |
1051 | frn->prefixlen = res.prefixlen; | |
1052 | frn->nh_sel = res.nh_sel; | |
1053 | frn->type = res.type; | |
1054 | frn->scope = res.scope; | |
1055 | } | |
1056 | local_bh_enable(); | |
1057 | } | |
345e9b54 AD |
1058 | |
1059 | rcu_read_unlock(); | |
246955fe RO |
1060 | } |
1061 | ||
28f7b036 | 1062 | static void nl_fib_input(struct sk_buff *skb) |
246955fe | 1063 | { |
6bd48fcf | 1064 | struct net *net; |
246955fe | 1065 | struct fib_result_nl *frn; |
28f7b036 | 1066 | struct nlmsghdr *nlh; |
15e47304 | 1067 | u32 portid; |
1194ed0a | 1068 | |
3b1e0a65 | 1069 | net = sock_net(skb->sk); |
b529ccf2 | 1070 | nlh = nlmsg_hdr(skb); |
573ce260 H |
1071 | if (skb->len < NLMSG_HDRLEN || skb->len < nlh->nlmsg_len || |
1072 | nlmsg_len(nlh) < sizeof(*frn)) | |
ea86575e | 1073 | return; |
d883a036 | 1074 | |
3a36515f | 1075 | skb = netlink_skb_clone(skb, GFP_KERNEL); |
51456b29 | 1076 | if (!skb) |
d883a036 DL |
1077 | return; |
1078 | nlh = nlmsg_hdr(skb); | |
e905a9ed | 1079 | |
573ce260 | 1080 | frn = (struct fib_result_nl *) nlmsg_data(nlh); |
345e9b54 | 1081 | nl_fib_lookup(net, frn); |
e905a9ed | 1082 | |
28a28283 | 1083 | portid = NETLINK_CB(skb).portid; /* netlink portid */ |
15e47304 | 1084 | NETLINK_CB(skb).portid = 0; /* from kernel */ |
ac6d439d | 1085 | NETLINK_CB(skb).dst_group = 0; /* unicast */ |
15e47304 | 1086 | netlink_unicast(net->ipv4.fibnl, skb, portid, MSG_DONTWAIT); |
e905a9ed | 1087 | } |
246955fe | 1088 | |
2c8c1e72 | 1089 | static int __net_init nl_fib_lookup_init(struct net *net) |
246955fe | 1090 | { |
6bd48fcf | 1091 | struct sock *sk; |
a31f2d17 PNA |
1092 | struct netlink_kernel_cfg cfg = { |
1093 | .input = nl_fib_input, | |
1094 | }; | |
1095 | ||
9f00d977 | 1096 | sk = netlink_kernel_create(net, NETLINK_FIB_LOOKUP, &cfg); |
51456b29 | 1097 | if (!sk) |
7b1a74fd | 1098 | return -EAFNOSUPPORT; |
6bd48fcf | 1099 | net->ipv4.fibnl = sk; |
7b1a74fd DL |
1100 | return 0; |
1101 | } | |
1102 | ||
1103 | static void nl_fib_lookup_exit(struct net *net) | |
1104 | { | |
b7c6ba6e | 1105 | netlink_kernel_release(net->ipv4.fibnl); |
775516bf | 1106 | net->ipv4.fibnl = NULL; |
246955fe RO |
1107 | } |
1108 | ||
8a3d0316 | 1109 | static void fib_disable_ip(struct net_device *dev, unsigned long event) |
1da177e4 | 1110 | { |
8a3d0316 | 1111 | if (fib_sync_down_dev(dev, event)) |
c346dca1 | 1112 | fib_flush(dev_net(dev)); |
4ccfe6d4 | 1113 | rt_cache_flush(dev_net(dev)); |
1da177e4 LT |
1114 | arp_ifdown(dev); |
1115 | } | |
1116 | ||
1117 | static int fib_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1118 | { | |
6ed2533e | 1119 | struct in_ifaddr *ifa = (struct in_ifaddr *)ptr; |
76e6ebfb | 1120 | struct net_device *dev = ifa->ifa_dev->dev; |
436c3b66 | 1121 | struct net *net = dev_net(dev); |
1da177e4 LT |
1122 | |
1123 | switch (event) { | |
1124 | case NETDEV_UP: | |
1125 | fib_add_ifaddr(ifa); | |
1126 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
8a3d0316 | 1127 | fib_sync_up(dev, RTNH_F_DEAD); |
1da177e4 | 1128 | #endif |
436c3b66 | 1129 | atomic_inc(&net->ipv4.dev_addr_genid); |
4ccfe6d4 | 1130 | rt_cache_flush(dev_net(dev)); |
1da177e4 LT |
1131 | break; |
1132 | case NETDEV_DOWN: | |
e6abbaa2 | 1133 | fib_del_ifaddr(ifa, NULL); |
436c3b66 | 1134 | atomic_inc(&net->ipv4.dev_addr_genid); |
51456b29 | 1135 | if (!ifa->ifa_dev->ifa_list) { |
1da177e4 | 1136 | /* Last address was deleted from this interface. |
6a31d2a9 | 1137 | * Disable IP. |
1da177e4 | 1138 | */ |
8a3d0316 | 1139 | fib_disable_ip(dev, event); |
1da177e4 | 1140 | } else { |
4ccfe6d4 | 1141 | rt_cache_flush(dev_net(dev)); |
1da177e4 LT |
1142 | } |
1143 | break; | |
1144 | } | |
1145 | return NOTIFY_DONE; | |
1146 | } | |
1147 | ||
1148 | static int fib_netdev_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1149 | { | |
351638e7 | 1150 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
0115e8e3 | 1151 | struct in_device *in_dev; |
436c3b66 | 1152 | struct net *net = dev_net(dev); |
8a3d0316 | 1153 | unsigned int flags; |
1da177e4 LT |
1154 | |
1155 | if (event == NETDEV_UNREGISTER) { | |
8a3d0316 | 1156 | fib_disable_ip(dev, event); |
caacf05e | 1157 | rt_flush_dev(dev); |
1da177e4 LT |
1158 | return NOTIFY_DONE; |
1159 | } | |
1160 | ||
0115e8e3 | 1161 | in_dev = __in_dev_get_rtnl(dev); |
a0065f26 OH |
1162 | if (!in_dev) |
1163 | return NOTIFY_DONE; | |
0115e8e3 | 1164 | |
1da177e4 LT |
1165 | switch (event) { |
1166 | case NETDEV_UP: | |
1167 | for_ifa(in_dev) { | |
1168 | fib_add_ifaddr(ifa); | |
1169 | } endfor_ifa(in_dev); | |
1170 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
8a3d0316 | 1171 | fib_sync_up(dev, RTNH_F_DEAD); |
1da177e4 | 1172 | #endif |
436c3b66 | 1173 | atomic_inc(&net->ipv4.dev_addr_genid); |
4ccfe6d4 | 1174 | rt_cache_flush(net); |
1da177e4 LT |
1175 | break; |
1176 | case NETDEV_DOWN: | |
8a3d0316 | 1177 | fib_disable_ip(dev, event); |
1da177e4 | 1178 | break; |
1da177e4 | 1179 | case NETDEV_CHANGE: |
8a3d0316 AG |
1180 | flags = dev_get_flags(dev); |
1181 | if (flags & (IFF_RUNNING | IFF_LOWER_UP)) | |
1182 | fib_sync_up(dev, RTNH_F_LINKDOWN); | |
1183 | else | |
1184 | fib_sync_down_dev(dev, event); | |
1185 | /* fall through */ | |
1186 | case NETDEV_CHANGEMTU: | |
4ccfe6d4 | 1187 | rt_cache_flush(net); |
1da177e4 LT |
1188 | break; |
1189 | } | |
1190 | return NOTIFY_DONE; | |
1191 | } | |
1192 | ||
1193 | static struct notifier_block fib_inetaddr_notifier = { | |
6ed2533e | 1194 | .notifier_call = fib_inetaddr_event, |
1da177e4 LT |
1195 | }; |
1196 | ||
1197 | static struct notifier_block fib_netdev_notifier = { | |
6ed2533e | 1198 | .notifier_call = fib_netdev_event, |
1da177e4 LT |
1199 | }; |
1200 | ||
7b1a74fd | 1201 | static int __net_init ip_fib_net_init(struct net *net) |
1da177e4 | 1202 | { |
dce5cbee | 1203 | int err; |
10da66f7 ED |
1204 | size_t size = sizeof(struct hlist_head) * FIB_TABLE_HASHSZ; |
1205 | ||
1206 | /* Avoid false sharing : Use at least a full cache line */ | |
1207 | size = max_t(size_t, size, L1_CACHE_BYTES); | |
1af5a8c4 | 1208 | |
10da66f7 | 1209 | net->ipv4.fib_table_hash = kzalloc(size, GFP_KERNEL); |
51456b29 | 1210 | if (!net->ipv4.fib_table_hash) |
e4aef8ae DL |
1211 | return -ENOMEM; |
1212 | ||
dce5cbee DL |
1213 | err = fib4_rules_init(net); |
1214 | if (err < 0) | |
1215 | goto fail; | |
1216 | return 0; | |
1217 | ||
1218 | fail: | |
1219 | kfree(net->ipv4.fib_table_hash); | |
1220 | return err; | |
7b1a74fd | 1221 | } |
1da177e4 | 1222 | |
2c8c1e72 | 1223 | static void ip_fib_net_exit(struct net *net) |
7b1a74fd DL |
1224 | { |
1225 | unsigned int i; | |
1226 | ||
6dede75b | 1227 | rtnl_lock(); |
6e47d6ca AD |
1228 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
1229 | RCU_INIT_POINTER(net->ipv4.fib_local, NULL); | |
1230 | RCU_INIT_POINTER(net->ipv4.fib_main, NULL); | |
1231 | RCU_INIT_POINTER(net->ipv4.fib_default, NULL); | |
1232 | #endif | |
7b1a74fd | 1233 | for (i = 0; i < FIB_TABLE_HASHSZ; i++) { |
a7e53531 | 1234 | struct hlist_head *head = &net->ipv4.fib_table_hash[i]; |
b67bfe0d | 1235 | struct hlist_node *tmp; |
a7e53531 AD |
1236 | struct fib_table *tb; |
1237 | ||
b67bfe0d SL |
1238 | hlist_for_each_entry_safe(tb, tmp, head, tb_hlist) { |
1239 | hlist_del(&tb->tb_hlist); | |
6e47d6ca | 1240 | fib_table_flush(tb); |
4aa2c466 | 1241 | fib_free_table(tb); |
7b1a74fd DL |
1242 | } |
1243 | } | |
ad88d051 AD |
1244 | |
1245 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
1246 | fib4_rules_exit(net); | |
1247 | #endif | |
e2666f84 | 1248 | rtnl_unlock(); |
e4aef8ae | 1249 | kfree(net->ipv4.fib_table_hash); |
7b1a74fd DL |
1250 | } |
1251 | ||
1252 | static int __net_init fib_net_init(struct net *net) | |
1253 | { | |
1254 | int error; | |
1255 | ||
f4530fa5 DM |
1256 | #ifdef CONFIG_IP_ROUTE_CLASSID |
1257 | net->ipv4.fib_num_tclassid_users = 0; | |
1258 | #endif | |
7b1a74fd DL |
1259 | error = ip_fib_net_init(net); |
1260 | if (error < 0) | |
1261 | goto out; | |
1262 | error = nl_fib_lookup_init(net); | |
1263 | if (error < 0) | |
1264 | goto out_nlfl; | |
1265 | error = fib_proc_init(net); | |
1266 | if (error < 0) | |
1267 | goto out_proc; | |
1268 | out: | |
1269 | return error; | |
1270 | ||
1271 | out_proc: | |
1272 | nl_fib_lookup_exit(net); | |
1273 | out_nlfl: | |
1274 | ip_fib_net_exit(net); | |
1275 | goto out; | |
1276 | } | |
1277 | ||
1278 | static void __net_exit fib_net_exit(struct net *net) | |
1279 | { | |
1280 | fib_proc_exit(net); | |
1281 | nl_fib_lookup_exit(net); | |
1282 | ip_fib_net_exit(net); | |
1283 | } | |
1284 | ||
1285 | static struct pernet_operations fib_net_ops = { | |
1286 | .init = fib_net_init, | |
1287 | .exit = fib_net_exit, | |
1288 | }; | |
1289 | ||
1290 | void __init ip_fib_init(void) | |
1291 | { | |
c7ac8679 GR |
1292 | rtnl_register(PF_INET, RTM_NEWROUTE, inet_rtm_newroute, NULL, NULL); |
1293 | rtnl_register(PF_INET, RTM_DELROUTE, inet_rtm_delroute, NULL, NULL); | |
1294 | rtnl_register(PF_INET, RTM_GETROUTE, NULL, inet_dump_fib, NULL); | |
7b1a74fd DL |
1295 | |
1296 | register_pernet_subsys(&fib_net_ops); | |
1297 | register_netdevice_notifier(&fib_netdev_notifier); | |
1298 | register_inetaddr_notifier(&fib_inetaddr_notifier); | |
7f9b8052 | 1299 | |
5348ba85 | 1300 | fib_trie_init(); |
1da177e4 | 1301 | } |