Commit | Line | Data |
---|---|---|
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> |
385add90 | 48 | #include <net/l3mdev.h> |
f6d3c192 | 49 | #include <trace/events/fib.h> |
1da177e4 | 50 | |
1da177e4 LT |
51 | #ifndef CONFIG_IP_MULTIPLE_TABLES |
52 | ||
7b1a74fd | 53 | static int __net_init fib4_rules_init(struct net *net) |
c3e9a353 | 54 | { |
93456b6d DL |
55 | struct fib_table *local_table, *main_table; |
56 | ||
0ddcf43d | 57 | main_table = fib_trie_table(RT_TABLE_MAIN, NULL); |
51456b29 | 58 | if (!main_table) |
61f0d861 | 59 | return -ENOMEM; |
dbb50165 | 60 | |
0ddcf43d | 61 | local_table = fib_trie_table(RT_TABLE_LOCAL, main_table); |
51456b29 | 62 | if (!local_table) |
61f0d861 | 63 | goto fail; |
0ddcf43d | 64 | |
93456b6d | 65 | hlist_add_head_rcu(&local_table->tb_hlist, |
e4aef8ae | 66 | &net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX]); |
93456b6d | 67 | hlist_add_head_rcu(&main_table->tb_hlist, |
e4aef8ae | 68 | &net->ipv4.fib_table_hash[TABLE_MAIN_INDEX]); |
dbb50165 DL |
69 | return 0; |
70 | ||
71 | fail: | |
61f0d861 | 72 | fib_free_table(main_table); |
dbb50165 | 73 | return -ENOMEM; |
c3e9a353 | 74 | } |
1af5a8c4 | 75 | #else |
1da177e4 | 76 | |
8ad4942c | 77 | struct fib_table *fib_new_table(struct net *net, u32 id) |
1da177e4 | 78 | { |
0ddcf43d | 79 | struct fib_table *tb, *alias = NULL; |
1af5a8c4 | 80 | unsigned int h; |
1da177e4 | 81 | |
1af5a8c4 PM |
82 | if (id == 0) |
83 | id = RT_TABLE_MAIN; | |
8ad4942c | 84 | tb = fib_get_table(net, id); |
1af5a8c4 PM |
85 | if (tb) |
86 | return tb; | |
7f9b8052 | 87 | |
0ddcf43d AD |
88 | if (id == RT_TABLE_LOCAL) |
89 | alias = fib_new_table(net, RT_TABLE_MAIN); | |
90 | ||
91 | tb = fib_trie_table(id, alias); | |
1da177e4 LT |
92 | if (!tb) |
93 | return NULL; | |
f4530fa5 DM |
94 | |
95 | switch (id) { | |
96 | case RT_TABLE_LOCAL: | |
a7e53531 | 97 | rcu_assign_pointer(net->ipv4.fib_local, tb); |
f4530fa5 | 98 | break; |
f4530fa5 | 99 | case RT_TABLE_MAIN: |
a7e53531 | 100 | rcu_assign_pointer(net->ipv4.fib_main, tb); |
f4530fa5 | 101 | break; |
f4530fa5 | 102 | case RT_TABLE_DEFAULT: |
a7e53531 | 103 | rcu_assign_pointer(net->ipv4.fib_default, tb); |
f4530fa5 | 104 | break; |
f4530fa5 DM |
105 | default: |
106 | break; | |
107 | } | |
108 | ||
1af5a8c4 | 109 | h = id & (FIB_TABLE_HASHSZ - 1); |
e4aef8ae | 110 | hlist_add_head_rcu(&tb->tb_hlist, &net->ipv4.fib_table_hash[h]); |
1da177e4 LT |
111 | return tb; |
112 | } | |
b3b4663c | 113 | EXPORT_SYMBOL_GPL(fib_new_table); |
1da177e4 | 114 | |
345e9b54 | 115 | /* caller must hold either rtnl or rcu read lock */ |
8ad4942c | 116 | struct fib_table *fib_get_table(struct net *net, u32 id) |
1af5a8c4 PM |
117 | { |
118 | struct fib_table *tb; | |
e4aef8ae | 119 | struct hlist_head *head; |
1af5a8c4 | 120 | unsigned int h; |
1da177e4 | 121 | |
1af5a8c4 PM |
122 | if (id == 0) |
123 | id = RT_TABLE_MAIN; | |
124 | h = id & (FIB_TABLE_HASHSZ - 1); | |
e4aef8ae | 125 | |
e4aef8ae | 126 | head = &net->ipv4.fib_table_hash[h]; |
b67bfe0d | 127 | hlist_for_each_entry_rcu(tb, head, tb_hlist) { |
345e9b54 | 128 | if (tb->tb_id == id) |
1af5a8c4 | 129 | return tb; |
1af5a8c4 | 130 | } |
1af5a8c4 PM |
131 | return NULL; |
132 | } | |
1da177e4 LT |
133 | #endif /* CONFIG_IP_MULTIPLE_TABLES */ |
134 | ||
0ddcf43d AD |
135 | static void fib_replace_table(struct net *net, struct fib_table *old, |
136 | struct fib_table *new) | |
137 | { | |
138 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
139 | switch (new->tb_id) { | |
140 | case RT_TABLE_LOCAL: | |
141 | rcu_assign_pointer(net->ipv4.fib_local, new); | |
142 | break; | |
143 | case RT_TABLE_MAIN: | |
144 | rcu_assign_pointer(net->ipv4.fib_main, new); | |
145 | break; | |
146 | case RT_TABLE_DEFAULT: | |
147 | rcu_assign_pointer(net->ipv4.fib_default, new); | |
148 | break; | |
149 | default: | |
150 | break; | |
151 | } | |
152 | ||
153 | #endif | |
154 | /* replace the old table in the hlist */ | |
155 | hlist_replace_rcu(&old->tb_hlist, &new->tb_hlist); | |
156 | } | |
157 | ||
158 | int fib_unmerge(struct net *net) | |
159 | { | |
160 | struct fib_table *old, *new; | |
161 | ||
3c9e9f73 | 162 | /* attempt to fetch local table if it has been allocated */ |
0ddcf43d | 163 | old = fib_get_table(net, RT_TABLE_LOCAL); |
3c9e9f73 AD |
164 | if (!old) |
165 | return 0; | |
0ddcf43d | 166 | |
3c9e9f73 | 167 | new = fib_trie_unmerge(old); |
0ddcf43d AD |
168 | if (!new) |
169 | return -ENOMEM; | |
170 | ||
171 | /* replace merged table with clean table */ | |
172 | if (new != old) { | |
173 | fib_replace_table(net, old, new); | |
174 | fib_free_table(old); | |
175 | } | |
176 | ||
177 | return 0; | |
178 | } | |
179 | ||
e4aef8ae | 180 | static void fib_flush(struct net *net) |
1da177e4 LT |
181 | { |
182 | int flushed = 0; | |
1af5a8c4 | 183 | unsigned int h; |
1da177e4 | 184 | |
1af5a8c4 | 185 | for (h = 0; h < FIB_TABLE_HASHSZ; h++) { |
a7e53531 AD |
186 | struct hlist_head *head = &net->ipv4.fib_table_hash[h]; |
187 | struct hlist_node *tmp; | |
188 | struct fib_table *tb; | |
189 | ||
190 | hlist_for_each_entry_safe(tb, tmp, head, tb_hlist) | |
16c6cf8b | 191 | flushed += fib_table_flush(tb); |
1da177e4 | 192 | } |
1da177e4 LT |
193 | |
194 | if (flushed) | |
4ccfe6d4 | 195 | rt_cache_flush(net); |
1da177e4 LT |
196 | } |
197 | ||
104616e7 SF |
198 | void fib_flush_external(struct net *net) |
199 | { | |
200 | struct fib_table *tb; | |
201 | struct hlist_head *head; | |
202 | unsigned int h; | |
203 | ||
204 | for (h = 0; h < FIB_TABLE_HASHSZ; h++) { | |
205 | head = &net->ipv4.fib_table_hash[h]; | |
206 | hlist_for_each_entry(tb, head, tb_hlist) | |
207 | fib_table_flush_external(tb); | |
208 | } | |
209 | } | |
210 | ||
05538116 LAT |
211 | /* |
212 | * Find address type as if only "dev" was present in the system. If | |
213 | * on_dev is NULL then all interfaces are taken into consideration. | |
214 | */ | |
95c96174 ED |
215 | static inline unsigned int __inet_dev_addr_type(struct net *net, |
216 | const struct net_device *dev, | |
9b8ff518 | 217 | __be32 addr, u32 tb_id) |
1da177e4 | 218 | { |
9ade2286 | 219 | struct flowi4 fl4 = { .daddr = addr }; |
1da177e4 | 220 | struct fib_result res; |
95c96174 | 221 | unsigned int ret = RTN_BROADCAST; |
15be405e | 222 | struct fib_table *table; |
1da177e4 | 223 | |
1e637c74 | 224 | if (ipv4_is_zeronet(addr) || ipv4_is_lbcast(addr)) |
1da177e4 | 225 | return RTN_BROADCAST; |
f97c1e0c | 226 | if (ipv4_is_multicast(addr)) |
1da177e4 LT |
227 | return RTN_MULTICAST; |
228 | ||
345e9b54 AD |
229 | rcu_read_lock(); |
230 | ||
15be405e DA |
231 | table = fib_get_table(net, tb_id); |
232 | if (table) { | |
1da177e4 | 233 | ret = RTN_UNICAST; |
15be405e | 234 | if (!fib_table_lookup(table, &fl4, &res, FIB_LOOKUP_NOREF)) { |
05538116 LAT |
235 | if (!dev || dev == res.fi->fib_dev) |
236 | ret = res.type; | |
1da177e4 LT |
237 | } |
238 | } | |
345e9b54 AD |
239 | |
240 | rcu_read_unlock(); | |
1da177e4 LT |
241 | return ret; |
242 | } | |
243 | ||
9b8ff518 | 244 | unsigned int inet_addr_type_table(struct net *net, __be32 addr, u32 tb_id) |
15be405e DA |
245 | { |
246 | return __inet_dev_addr_type(net, NULL, addr, tb_id); | |
247 | } | |
248 | EXPORT_SYMBOL(inet_addr_type_table); | |
249 | ||
6b175b26 | 250 | unsigned int inet_addr_type(struct net *net, __be32 addr) |
05538116 | 251 | { |
15be405e | 252 | return __inet_dev_addr_type(net, NULL, addr, RT_TABLE_LOCAL); |
05538116 | 253 | } |
4bc2f18b | 254 | EXPORT_SYMBOL(inet_addr_type); |
05538116 | 255 | |
6b175b26 EB |
256 | unsigned int inet_dev_addr_type(struct net *net, const struct net_device *dev, |
257 | __be32 addr) | |
05538116 | 258 | { |
3236b004 | 259 | u32 rt_table = l3mdev_fib_table(dev) ? : RT_TABLE_LOCAL; |
15be405e DA |
260 | |
261 | return __inet_dev_addr_type(net, dev, addr, rt_table); | |
05538116 | 262 | } |
4bc2f18b | 263 | EXPORT_SYMBOL(inet_dev_addr_type); |
05538116 | 264 | |
30bbaa19 DA |
265 | /* inet_addr_type with dev == NULL but using the table from a dev |
266 | * if one is associated | |
267 | */ | |
268 | unsigned int inet_addr_type_dev_table(struct net *net, | |
269 | const struct net_device *dev, | |
270 | __be32 addr) | |
271 | { | |
3236b004 | 272 | u32 rt_table = l3mdev_fib_table(dev) ? : RT_TABLE_LOCAL; |
30bbaa19 DA |
273 | |
274 | return __inet_dev_addr_type(net, NULL, addr, rt_table); | |
275 | } | |
276 | EXPORT_SYMBOL(inet_addr_type_dev_table); | |
277 | ||
35ebf65e DM |
278 | __be32 fib_compute_spec_dst(struct sk_buff *skb) |
279 | { | |
280 | struct net_device *dev = skb->dev; | |
281 | struct in_device *in_dev; | |
282 | struct fib_result res; | |
a207a4b2 | 283 | struct rtable *rt; |
35ebf65e | 284 | struct net *net; |
a207a4b2 | 285 | int scope; |
35ebf65e | 286 | |
a207a4b2 | 287 | rt = skb_rtable(skb); |
0cc535a2 JA |
288 | if ((rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST | RTCF_LOCAL)) == |
289 | RTCF_LOCAL) | |
35ebf65e DM |
290 | return ip_hdr(skb)->daddr; |
291 | ||
292 | in_dev = __in_dev_get_rcu(dev); | |
293 | BUG_ON(!in_dev); | |
35ebf65e DM |
294 | |
295 | net = dev_net(dev); | |
a207a4b2 DM |
296 | |
297 | scope = RT_SCOPE_UNIVERSE; | |
298 | if (!ipv4_is_zeronet(ip_hdr(skb)->saddr)) { | |
4cfc86f3 LR |
299 | struct flowi4 fl4 = { |
300 | .flowi4_iif = LOOPBACK_IFINDEX, | |
301 | .daddr = ip_hdr(skb)->saddr, | |
302 | .flowi4_tos = RT_TOS(ip_hdr(skb)->tos), | |
303 | .flowi4_scope = scope, | |
304 | .flowi4_mark = IN_DEV_SRC_VMARK(in_dev) ? skb->mark : 0, | |
305 | }; | |
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; |
385add90 | 334 | fl4.flowi4_iif = l3mdev_master_ifindex_rcu(dev); |
cd2fbe1b DA |
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; |
b84f7878 | 342 | fl4.flowi4_flags = 0; |
cc7e17ea | 343 | |
9e56e380 | 344 | no_addr = idev->ifa_list == NULL; |
990078af | 345 | |
9e56e380 | 346 | fl4.flowi4_mark = IN_DEV_SRC_VMARK(idev) ? skb->mark : 0; |
1da177e4 | 347 | |
f6d3c192 DA |
348 | trace_fib_validate_source(dev, &fl4); |
349 | ||
c346dca1 | 350 | net = dev_net(dev); |
0eeb075f | 351 | if (fib_lookup(net, &fl4, &res, 0)) |
1da177e4 | 352 | goto last_resort; |
1dced6a8 SB |
353 | if (res.type != RTN_UNICAST && |
354 | (res.type != RTN_LOCAL || !IN_DEV_ACCEPT_LOCAL(idev))) | |
355 | goto e_inval; | |
356 | if (!rpf && !fib_num_tclassid_users(dev_net(dev)) && | |
357 | (dev->ifindex != oif || !IN_DEV_TX_REDIRECTS(idev))) | |
358 | goto last_resort; | |
1da177e4 | 359 | fib_combine_itag(itag, &res); |
6f86b325 DM |
360 | dev_match = false; |
361 | ||
1da177e4 | 362 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
6f86b325 DM |
363 | for (ret = 0; ret < res.fi->fib_nhs; ret++) { |
364 | struct fib_nh *nh = &res.fi->fib_nh[ret]; | |
365 | ||
366 | if (nh->nh_dev == dev) { | |
367 | dev_match = true; | |
368 | break; | |
385add90 | 369 | } else if (l3mdev_master_ifindex_rcu(nh->nh_dev) == dev->ifindex) { |
cd2fbe1b DA |
370 | dev_match = true; |
371 | break; | |
6f86b325 DM |
372 | } |
373 | } | |
1da177e4 LT |
374 | #else |
375 | if (FIB_RES_DEV(res) == dev) | |
6f86b325 | 376 | dev_match = true; |
1da177e4 | 377 | #endif |
6f86b325 | 378 | if (dev_match) { |
1da177e4 | 379 | ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST; |
1da177e4 LT |
380 | return ret; |
381 | } | |
1da177e4 LT |
382 | if (no_addr) |
383 | goto last_resort; | |
c1cf8422 | 384 | if (rpf == 1) |
b5f7e755 | 385 | goto e_rpf; |
9ade2286 | 386 | fl4.flowi4_oif = dev->ifindex; |
1da177e4 LT |
387 | |
388 | ret = 0; | |
0eeb075f | 389 | if (fib_lookup(net, &fl4, &res, FIB_LOOKUP_IGNORE_LINKSTATE) == 0) { |
41347dcd | 390 | if (res.type == RTN_UNICAST) |
1da177e4 | 391 | ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST; |
1da177e4 LT |
392 | } |
393 | return ret; | |
394 | ||
395 | last_resort: | |
396 | if (rpf) | |
b5f7e755 | 397 | goto e_rpf; |
1da177e4 LT |
398 | *itag = 0; |
399 | return 0; | |
400 | ||
1da177e4 LT |
401 | e_inval: |
402 | return -EINVAL; | |
b5f7e755 ED |
403 | e_rpf: |
404 | return -EXDEV; | |
1da177e4 LT |
405 | } |
406 | ||
7a9bc9b8 DM |
407 | /* Ignore rp_filter for packets protected by IPsec. */ |
408 | int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst, | |
409 | u8 tos, int oif, struct net_device *dev, | |
410 | struct in_device *idev, u32 *itag) | |
411 | { | |
412 | int r = secpath_exists(skb) ? 0 : IN_DEV_RPFILTER(idev); | |
413 | ||
e81da0e1 | 414 | if (!r && !fib_num_tclassid_users(dev_net(dev)) && |
1dced6a8 | 415 | IN_DEV_ACCEPT_LOCAL(idev) && |
e81da0e1 | 416 | (dev->ifindex != oif || !IN_DEV_TX_REDIRECTS(idev))) { |
7a9bc9b8 DM |
417 | *itag = 0; |
418 | return 0; | |
419 | } | |
420 | return __fib_validate_source(skb, src, dst, tos, oif, dev, r, idev, itag); | |
421 | } | |
422 | ||
81f7bf6c | 423 | static inline __be32 sk_extract_addr(struct sockaddr *addr) |
4e902c57 TG |
424 | { |
425 | return ((struct sockaddr_in *) addr)->sin_addr.s_addr; | |
426 | } | |
427 | ||
428 | static int put_rtax(struct nlattr *mx, int len, int type, u32 value) | |
429 | { | |
430 | struct nlattr *nla; | |
431 | ||
432 | nla = (struct nlattr *) ((char *) mx + len); | |
433 | nla->nla_type = type; | |
434 | nla->nla_len = nla_attr_size(4); | |
435 | *(u32 *) nla_data(nla) = value; | |
436 | ||
437 | return len + nla_total_size(4); | |
438 | } | |
439 | ||
4b5d47d4 | 440 | static int rtentry_to_fib_config(struct net *net, int cmd, struct rtentry *rt, |
4e902c57 TG |
441 | struct fib_config *cfg) |
442 | { | |
6d85c10a | 443 | __be32 addr; |
4e902c57 TG |
444 | int plen; |
445 | ||
446 | memset(cfg, 0, sizeof(*cfg)); | |
4b5d47d4 | 447 | cfg->fc_nlinfo.nl_net = net; |
4e902c57 TG |
448 | |
449 | if (rt->rt_dst.sa_family != AF_INET) | |
450 | return -EAFNOSUPPORT; | |
451 | ||
452 | /* | |
453 | * Check mask for validity: | |
454 | * a) it must be contiguous. | |
455 | * b) destination must have all host bits clear. | |
456 | * c) if application forgot to set correct family (AF_INET), | |
457 | * reject request unless it is absolutely clear i.e. | |
458 | * both family and mask are zero. | |
459 | */ | |
460 | plen = 32; | |
461 | addr = sk_extract_addr(&rt->rt_dst); | |
462 | if (!(rt->rt_flags & RTF_HOST)) { | |
81f7bf6c | 463 | __be32 mask = sk_extract_addr(&rt->rt_genmask); |
4e902c57 TG |
464 | |
465 | if (rt->rt_genmask.sa_family != AF_INET) { | |
466 | if (mask || rt->rt_genmask.sa_family) | |
467 | return -EAFNOSUPPORT; | |
468 | } | |
469 | ||
470 | if (bad_mask(mask, addr)) | |
471 | return -EINVAL; | |
472 | ||
473 | plen = inet_mask_len(mask); | |
474 | } | |
475 | ||
476 | cfg->fc_dst_len = plen; | |
477 | cfg->fc_dst = addr; | |
478 | ||
479 | if (cmd != SIOCDELRT) { | |
480 | cfg->fc_nlflags = NLM_F_CREATE; | |
481 | cfg->fc_protocol = RTPROT_BOOT; | |
482 | } | |
483 | ||
484 | if (rt->rt_metric) | |
485 | cfg->fc_priority = rt->rt_metric - 1; | |
486 | ||
487 | if (rt->rt_flags & RTF_REJECT) { | |
488 | cfg->fc_scope = RT_SCOPE_HOST; | |
489 | cfg->fc_type = RTN_UNREACHABLE; | |
490 | return 0; | |
491 | } | |
492 | ||
493 | cfg->fc_scope = RT_SCOPE_NOWHERE; | |
494 | cfg->fc_type = RTN_UNICAST; | |
495 | ||
496 | if (rt->rt_dev) { | |
497 | char *colon; | |
498 | struct net_device *dev; | |
499 | char devname[IFNAMSIZ]; | |
500 | ||
501 | if (copy_from_user(devname, rt->rt_dev, IFNAMSIZ-1)) | |
502 | return -EFAULT; | |
503 | ||
504 | devname[IFNAMSIZ-1] = 0; | |
505 | colon = strchr(devname, ':'); | |
506 | if (colon) | |
507 | *colon = 0; | |
4b5d47d4 | 508 | dev = __dev_get_by_name(net, devname); |
4e902c57 TG |
509 | if (!dev) |
510 | return -ENODEV; | |
511 | cfg->fc_oif = dev->ifindex; | |
512 | if (colon) { | |
513 | struct in_ifaddr *ifa; | |
514 | struct in_device *in_dev = __in_dev_get_rtnl(dev); | |
515 | if (!in_dev) | |
516 | return -ENODEV; | |
517 | *colon = ':'; | |
518 | for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) | |
519 | if (strcmp(ifa->ifa_label, devname) == 0) | |
520 | break; | |
51456b29 | 521 | if (!ifa) |
4e902c57 TG |
522 | return -ENODEV; |
523 | cfg->fc_prefsrc = ifa->ifa_local; | |
524 | } | |
525 | } | |
526 | ||
527 | addr = sk_extract_addr(&rt->rt_gateway); | |
528 | if (rt->rt_gateway.sa_family == AF_INET && addr) { | |
30bbaa19 DA |
529 | unsigned int addr_type; |
530 | ||
4e902c57 | 531 | cfg->fc_gw = addr; |
30bbaa19 | 532 | addr_type = inet_addr_type_table(net, addr, cfg->fc_table); |
4e902c57 | 533 | if (rt->rt_flags & RTF_GATEWAY && |
30bbaa19 | 534 | addr_type == RTN_UNICAST) |
4e902c57 TG |
535 | cfg->fc_scope = RT_SCOPE_UNIVERSE; |
536 | } | |
537 | ||
538 | if (cmd == SIOCDELRT) | |
539 | return 0; | |
540 | ||
541 | if (rt->rt_flags & RTF_GATEWAY && !cfg->fc_gw) | |
542 | return -EINVAL; | |
543 | ||
544 | if (cfg->fc_scope == RT_SCOPE_NOWHERE) | |
545 | cfg->fc_scope = RT_SCOPE_LINK; | |
546 | ||
547 | if (rt->rt_flags & (RTF_MTU | RTF_WINDOW | RTF_IRTT)) { | |
548 | struct nlattr *mx; | |
549 | int len = 0; | |
550 | ||
551 | mx = kzalloc(3 * nla_total_size(4), GFP_KERNEL); | |
51456b29 | 552 | if (!mx) |
4e902c57 TG |
553 | return -ENOMEM; |
554 | ||
555 | if (rt->rt_flags & RTF_MTU) | |
556 | len = put_rtax(mx, len, RTAX_ADVMSS, rt->rt_mtu - 40); | |
557 | ||
558 | if (rt->rt_flags & RTF_WINDOW) | |
559 | len = put_rtax(mx, len, RTAX_WINDOW, rt->rt_window); | |
560 | ||
561 | if (rt->rt_flags & RTF_IRTT) | |
562 | len = put_rtax(mx, len, RTAX_RTT, rt->rt_irtt << 3); | |
563 | ||
564 | cfg->fc_mx = mx; | |
565 | cfg->fc_mx_len = len; | |
566 | } | |
567 | ||
568 | return 0; | |
569 | } | |
570 | ||
1da177e4 | 571 | /* |
6a31d2a9 ED |
572 | * Handle IP routing ioctl calls. |
573 | * These are used to manipulate the routing tables | |
1da177e4 | 574 | */ |
1bad118a | 575 | int ip_rt_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
1da177e4 | 576 | { |
4e902c57 TG |
577 | struct fib_config cfg; |
578 | struct rtentry rt; | |
1da177e4 | 579 | int err; |
1da177e4 LT |
580 | |
581 | switch (cmd) { | |
582 | case SIOCADDRT: /* Add a route */ | |
583 | case SIOCDELRT: /* Delete a route */ | |
52e804c6 | 584 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 | 585 | return -EPERM; |
4e902c57 TG |
586 | |
587 | if (copy_from_user(&rt, arg, sizeof(rt))) | |
1da177e4 | 588 | return -EFAULT; |
4e902c57 | 589 | |
1da177e4 | 590 | rtnl_lock(); |
1bad118a | 591 | err = rtentry_to_fib_config(net, cmd, &rt, &cfg); |
1da177e4 | 592 | if (err == 0) { |
4e902c57 TG |
593 | struct fib_table *tb; |
594 | ||
1da177e4 | 595 | if (cmd == SIOCDELRT) { |
1bad118a | 596 | tb = fib_get_table(net, cfg.fc_table); |
1da177e4 | 597 | if (tb) |
16c6cf8b | 598 | err = fib_table_delete(tb, &cfg); |
4e902c57 TG |
599 | else |
600 | err = -ESRCH; | |
1da177e4 | 601 | } else { |
1bad118a | 602 | tb = fib_new_table(net, cfg.fc_table); |
1da177e4 | 603 | if (tb) |
16c6cf8b | 604 | err = fib_table_insert(tb, &cfg); |
4e902c57 TG |
605 | else |
606 | err = -ENOBUFS; | |
1da177e4 | 607 | } |
4e902c57 TG |
608 | |
609 | /* allocated by rtentry_to_fib_config() */ | |
610 | kfree(cfg.fc_mx); | |
1da177e4 LT |
611 | } |
612 | rtnl_unlock(); | |
613 | return err; | |
614 | } | |
615 | return -EINVAL; | |
616 | } | |
617 | ||
6a31d2a9 | 618 | const struct nla_policy rtm_ipv4_policy[RTA_MAX + 1] = { |
4e902c57 TG |
619 | [RTA_DST] = { .type = NLA_U32 }, |
620 | [RTA_SRC] = { .type = NLA_U32 }, | |
621 | [RTA_IIF] = { .type = NLA_U32 }, | |
622 | [RTA_OIF] = { .type = NLA_U32 }, | |
623 | [RTA_GATEWAY] = { .type = NLA_U32 }, | |
624 | [RTA_PRIORITY] = { .type = NLA_U32 }, | |
625 | [RTA_PREFSRC] = { .type = NLA_U32 }, | |
626 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
5176f91e | 627 | [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) }, |
4e902c57 | 628 | [RTA_FLOW] = { .type = NLA_U32 }, |
571e7226 RP |
629 | [RTA_ENCAP_TYPE] = { .type = NLA_U16 }, |
630 | [RTA_ENCAP] = { .type = NLA_NESTED }, | |
4e902c57 TG |
631 | }; |
632 | ||
4b5d47d4 | 633 | static int rtm_to_fib_config(struct net *net, struct sk_buff *skb, |
6a31d2a9 | 634 | struct nlmsghdr *nlh, struct fib_config *cfg) |
1da177e4 | 635 | { |
4e902c57 TG |
636 | struct nlattr *attr; |
637 | int err, remaining; | |
638 | struct rtmsg *rtm; | |
639 | ||
640 | err = nlmsg_validate(nlh, sizeof(*rtm), RTA_MAX, rtm_ipv4_policy); | |
641 | if (err < 0) | |
642 | goto errout; | |
643 | ||
644 | memset(cfg, 0, sizeof(*cfg)); | |
645 | ||
646 | rtm = nlmsg_data(nlh); | |
4e902c57 | 647 | cfg->fc_dst_len = rtm->rtm_dst_len; |
4e902c57 TG |
648 | cfg->fc_tos = rtm->rtm_tos; |
649 | cfg->fc_table = rtm->rtm_table; | |
650 | cfg->fc_protocol = rtm->rtm_protocol; | |
651 | cfg->fc_scope = rtm->rtm_scope; | |
652 | cfg->fc_type = rtm->rtm_type; | |
653 | cfg->fc_flags = rtm->rtm_flags; | |
654 | cfg->fc_nlflags = nlh->nlmsg_flags; | |
655 | ||
15e47304 | 656 | cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid; |
4e902c57 | 657 | cfg->fc_nlinfo.nlh = nlh; |
4b5d47d4 | 658 | cfg->fc_nlinfo.nl_net = net; |
4e902c57 | 659 | |
a0ee18b9 TG |
660 | if (cfg->fc_type > RTN_MAX) { |
661 | err = -EINVAL; | |
662 | goto errout; | |
663 | } | |
664 | ||
4e902c57 | 665 | nlmsg_for_each_attr(attr, nlh, sizeof(struct rtmsg), remaining) { |
8f4c1f9b | 666 | switch (nla_type(attr)) { |
4e902c57 | 667 | case RTA_DST: |
17fb2c64 | 668 | cfg->fc_dst = nla_get_be32(attr); |
4e902c57 | 669 | break; |
4e902c57 TG |
670 | case RTA_OIF: |
671 | cfg->fc_oif = nla_get_u32(attr); | |
672 | break; | |
673 | case RTA_GATEWAY: | |
17fb2c64 | 674 | cfg->fc_gw = nla_get_be32(attr); |
4e902c57 TG |
675 | break; |
676 | case RTA_PRIORITY: | |
677 | cfg->fc_priority = nla_get_u32(attr); | |
678 | break; | |
679 | case RTA_PREFSRC: | |
17fb2c64 | 680 | cfg->fc_prefsrc = nla_get_be32(attr); |
4e902c57 TG |
681 | break; |
682 | case RTA_METRICS: | |
683 | cfg->fc_mx = nla_data(attr); | |
684 | cfg->fc_mx_len = nla_len(attr); | |
685 | break; | |
686 | case RTA_MULTIPATH: | |
687 | cfg->fc_mp = nla_data(attr); | |
688 | cfg->fc_mp_len = nla_len(attr); | |
689 | break; | |
690 | case RTA_FLOW: | |
691 | cfg->fc_flow = nla_get_u32(attr); | |
692 | break; | |
4e902c57 TG |
693 | case RTA_TABLE: |
694 | cfg->fc_table = nla_get_u32(attr); | |
695 | break; | |
571e7226 RP |
696 | case RTA_ENCAP: |
697 | cfg->fc_encap = attr; | |
698 | break; | |
699 | case RTA_ENCAP_TYPE: | |
700 | cfg->fc_encap_type = nla_get_u16(attr); | |
701 | break; | |
1da177e4 LT |
702 | } |
703 | } | |
4e902c57 | 704 | |
1da177e4 | 705 | return 0; |
4e902c57 TG |
706 | errout: |
707 | return err; | |
1da177e4 LT |
708 | } |
709 | ||
661d2967 | 710 | static int inet_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh) |
1da177e4 | 711 | { |
3b1e0a65 | 712 | struct net *net = sock_net(skb->sk); |
4e902c57 TG |
713 | struct fib_config cfg; |
714 | struct fib_table *tb; | |
715 | int err; | |
1da177e4 | 716 | |
4b5d47d4 | 717 | err = rtm_to_fib_config(net, skb, nlh, &cfg); |
4e902c57 TG |
718 | if (err < 0) |
719 | goto errout; | |
1da177e4 | 720 | |
8ad4942c | 721 | tb = fib_get_table(net, cfg.fc_table); |
51456b29 | 722 | if (!tb) { |
4e902c57 TG |
723 | err = -ESRCH; |
724 | goto errout; | |
725 | } | |
726 | ||
16c6cf8b | 727 | err = fib_table_delete(tb, &cfg); |
4e902c57 TG |
728 | errout: |
729 | return err; | |
1da177e4 LT |
730 | } |
731 | ||
661d2967 | 732 | static int inet_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh) |
1da177e4 | 733 | { |
3b1e0a65 | 734 | struct net *net = sock_net(skb->sk); |
4e902c57 TG |
735 | struct fib_config cfg; |
736 | struct fib_table *tb; | |
737 | int err; | |
1da177e4 | 738 | |
4b5d47d4 | 739 | err = rtm_to_fib_config(net, skb, nlh, &cfg); |
4e902c57 TG |
740 | if (err < 0) |
741 | goto errout; | |
1da177e4 | 742 | |
226b0b4a | 743 | tb = fib_new_table(net, cfg.fc_table); |
51456b29 | 744 | if (!tb) { |
4e902c57 TG |
745 | err = -ENOBUFS; |
746 | goto errout; | |
747 | } | |
748 | ||
16c6cf8b | 749 | err = fib_table_insert(tb, &cfg); |
4e902c57 TG |
750 | errout: |
751 | return err; | |
1da177e4 LT |
752 | } |
753 | ||
63f3444f | 754 | static int inet_dump_fib(struct sk_buff *skb, struct netlink_callback *cb) |
1da177e4 | 755 | { |
3b1e0a65 | 756 | struct net *net = sock_net(skb->sk); |
1af5a8c4 PM |
757 | unsigned int h, s_h; |
758 | unsigned int e = 0, s_e; | |
1da177e4 | 759 | struct fib_table *tb; |
e4aef8ae | 760 | struct hlist_head *head; |
1af5a8c4 | 761 | int dumped = 0; |
1da177e4 | 762 | |
be403ea1 TG |
763 | if (nlmsg_len(cb->nlh) >= sizeof(struct rtmsg) && |
764 | ((struct rtmsg *) nlmsg_data(cb->nlh))->rtm_flags & RTM_F_CLONED) | |
0b8c7f6f | 765 | return skb->len; |
1da177e4 | 766 | |
1af5a8c4 PM |
767 | s_h = cb->args[0]; |
768 | s_e = cb->args[1]; | |
769 | ||
a7e53531 AD |
770 | rcu_read_lock(); |
771 | ||
1af5a8c4 PM |
772 | for (h = s_h; h < FIB_TABLE_HASHSZ; h++, s_e = 0) { |
773 | e = 0; | |
e4aef8ae | 774 | head = &net->ipv4.fib_table_hash[h]; |
a7e53531 | 775 | hlist_for_each_entry_rcu(tb, head, tb_hlist) { |
1af5a8c4 PM |
776 | if (e < s_e) |
777 | goto next; | |
778 | if (dumped) | |
779 | memset(&cb->args[2], 0, sizeof(cb->args) - | |
e905a9ed | 780 | 2 * sizeof(cb->args[0])); |
16c6cf8b | 781 | if (fib_table_dump(tb, skb, cb) < 0) |
1af5a8c4 PM |
782 | goto out; |
783 | dumped = 1; | |
784 | next: | |
785 | e++; | |
786 | } | |
1da177e4 | 787 | } |
1af5a8c4 | 788 | out: |
a7e53531 AD |
789 | rcu_read_unlock(); |
790 | ||
1af5a8c4 PM |
791 | cb->args[1] = e; |
792 | cb->args[0] = h; | |
1da177e4 LT |
793 | |
794 | return skb->len; | |
795 | } | |
796 | ||
797 | /* Prepare and feed intra-kernel routing request. | |
6a31d2a9 ED |
798 | * Really, it should be netlink message, but :-( netlink |
799 | * can be not configured, so that we feed it directly | |
800 | * to fib engine. It is legal, because all events occur | |
801 | * only when netlink is already locked. | |
1da177e4 | 802 | */ |
81f7bf6c | 803 | static void fib_magic(int cmd, int type, __be32 dst, int dst_len, struct in_ifaddr *ifa) |
1da177e4 | 804 | { |
c346dca1 | 805 | struct net *net = dev_net(ifa->ifa_dev->dev); |
3236b004 | 806 | u32 tb_id = l3mdev_fib_table(ifa->ifa_dev->dev); |
4e902c57 TG |
807 | struct fib_table *tb; |
808 | struct fib_config cfg = { | |
809 | .fc_protocol = RTPROT_KERNEL, | |
810 | .fc_type = type, | |
811 | .fc_dst = dst, | |
812 | .fc_dst_len = dst_len, | |
813 | .fc_prefsrc = ifa->ifa_local, | |
814 | .fc_oif = ifa->ifa_dev->dev->ifindex, | |
815 | .fc_nlflags = NLM_F_CREATE | NLM_F_APPEND, | |
4d1169c1 | 816 | .fc_nlinfo = { |
4b5d47d4 | 817 | .nl_net = net, |
4d1169c1 | 818 | }, |
4e902c57 | 819 | }; |
1da177e4 | 820 | |
021dd3b8 DA |
821 | if (!tb_id) |
822 | tb_id = (type == RTN_UNICAST) ? RT_TABLE_MAIN : RT_TABLE_LOCAL; | |
1da177e4 | 823 | |
021dd3b8 | 824 | tb = fib_new_table(net, tb_id); |
51456b29 | 825 | if (!tb) |
1da177e4 LT |
826 | return; |
827 | ||
4e902c57 | 828 | cfg.fc_table = tb->tb_id; |
1da177e4 | 829 | |
4e902c57 TG |
830 | if (type != RTN_LOCAL) |
831 | cfg.fc_scope = RT_SCOPE_LINK; | |
832 | else | |
833 | cfg.fc_scope = RT_SCOPE_HOST; | |
1da177e4 LT |
834 | |
835 | if (cmd == RTM_NEWROUTE) | |
16c6cf8b | 836 | fib_table_insert(tb, &cfg); |
1da177e4 | 837 | else |
16c6cf8b | 838 | fib_table_delete(tb, &cfg); |
1da177e4 LT |
839 | } |
840 | ||
0ff60a45 | 841 | void fib_add_ifaddr(struct in_ifaddr *ifa) |
1da177e4 LT |
842 | { |
843 | struct in_device *in_dev = ifa->ifa_dev; | |
844 | struct net_device *dev = in_dev->dev; | |
845 | struct in_ifaddr *prim = ifa; | |
a144ea4b AV |
846 | __be32 mask = ifa->ifa_mask; |
847 | __be32 addr = ifa->ifa_local; | |
6a31d2a9 | 848 | __be32 prefix = ifa->ifa_address & mask; |
1da177e4 | 849 | |
6a31d2a9 | 850 | if (ifa->ifa_flags & IFA_F_SECONDARY) { |
1da177e4 | 851 | prim = inet_ifa_byprefix(in_dev, prefix, mask); |
51456b29 | 852 | if (!prim) { |
058bd4d2 | 853 | pr_warn("%s: bug: prim == NULL\n", __func__); |
1da177e4 LT |
854 | return; |
855 | } | |
856 | } | |
857 | ||
858 | fib_magic(RTM_NEWROUTE, RTN_LOCAL, addr, 32, prim); | |
859 | ||
6a31d2a9 | 860 | if (!(dev->flags & IFF_UP)) |
1da177e4 LT |
861 | return; |
862 | ||
863 | /* Add broadcast address, if it is explicitly assigned. */ | |
a144ea4b | 864 | if (ifa->ifa_broadcast && ifa->ifa_broadcast != htonl(0xFFFFFFFF)) |
1da177e4 LT |
865 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim); |
866 | ||
6a31d2a9 | 867 | if (!ipv4_is_zeronet(prefix) && !(ifa->ifa_flags & IFA_F_SECONDARY) && |
1da177e4 | 868 | (prefix != addr || ifa->ifa_prefixlen < 32)) { |
7b131180 PA |
869 | if (!(ifa->ifa_flags & IFA_F_NOPREFIXROUTE)) |
870 | fib_magic(RTM_NEWROUTE, | |
871 | dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST, | |
872 | prefix, ifa->ifa_prefixlen, prim); | |
1da177e4 LT |
873 | |
874 | /* Add network specific broadcasts, when it takes a sense */ | |
875 | if (ifa->ifa_prefixlen < 31) { | |
876 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix, 32, prim); | |
6a31d2a9 ED |
877 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix | ~mask, |
878 | 32, prim); | |
1da177e4 LT |
879 | } |
880 | } | |
881 | } | |
882 | ||
e6abbaa2 JA |
883 | /* Delete primary or secondary address. |
884 | * Optionally, on secondary address promotion consider the addresses | |
885 | * from subnet iprim as deleted, even if they are in device list. | |
886 | * In this case the secondary ifa can be in device list. | |
887 | */ | |
888 | void fib_del_ifaddr(struct in_ifaddr *ifa, struct in_ifaddr *iprim) | |
1da177e4 LT |
889 | { |
890 | struct in_device *in_dev = ifa->ifa_dev; | |
891 | struct net_device *dev = in_dev->dev; | |
892 | struct in_ifaddr *ifa1; | |
e6abbaa2 | 893 | struct in_ifaddr *prim = ifa, *prim1 = NULL; |
6a31d2a9 ED |
894 | __be32 brd = ifa->ifa_address | ~ifa->ifa_mask; |
895 | __be32 any = ifa->ifa_address & ifa->ifa_mask; | |
1da177e4 LT |
896 | #define LOCAL_OK 1 |
897 | #define BRD_OK 2 | |
898 | #define BRD0_OK 4 | |
899 | #define BRD1_OK 8 | |
95c96174 | 900 | unsigned int ok = 0; |
e6abbaa2 JA |
901 | int subnet = 0; /* Primary network */ |
902 | int gone = 1; /* Address is missing */ | |
903 | int same_prefsrc = 0; /* Another primary with same IP */ | |
1da177e4 | 904 | |
e6abbaa2 | 905 | if (ifa->ifa_flags & IFA_F_SECONDARY) { |
1da177e4 | 906 | prim = inet_ifa_byprefix(in_dev, any, ifa->ifa_mask); |
51456b29 | 907 | if (!prim) { |
391a2033 PA |
908 | /* if the device has been deleted, we don't perform |
909 | * address promotion | |
910 | */ | |
911 | if (!in_dev->dead) | |
912 | pr_warn("%s: bug: prim == NULL\n", __func__); | |
1da177e4 LT |
913 | return; |
914 | } | |
e6abbaa2 | 915 | if (iprim && iprim != prim) { |
058bd4d2 | 916 | pr_warn("%s: bug: iprim != prim\n", __func__); |
e6abbaa2 JA |
917 | return; |
918 | } | |
919 | } else if (!ipv4_is_zeronet(any) && | |
920 | (any != ifa->ifa_local || ifa->ifa_prefixlen < 32)) { | |
7b131180 PA |
921 | if (!(ifa->ifa_flags & IFA_F_NOPREFIXROUTE)) |
922 | fib_magic(RTM_DELROUTE, | |
923 | dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST, | |
924 | any, ifa->ifa_prefixlen, prim); | |
e6abbaa2 | 925 | subnet = 1; |
1da177e4 LT |
926 | } |
927 | ||
fbd40ea0 DM |
928 | if (in_dev->dead) |
929 | goto no_promotions; | |
930 | ||
1da177e4 | 931 | /* Deletion is more complicated than add. |
6a31d2a9 ED |
932 | * We should take care of not to delete too much :-) |
933 | * | |
934 | * Scan address list to be sure that addresses are really gone. | |
1da177e4 LT |
935 | */ |
936 | ||
937 | for (ifa1 = in_dev->ifa_list; ifa1; ifa1 = ifa1->ifa_next) { | |
e6abbaa2 JA |
938 | if (ifa1 == ifa) { |
939 | /* promotion, keep the IP */ | |
940 | gone = 0; | |
941 | continue; | |
942 | } | |
943 | /* Ignore IFAs from our subnet */ | |
944 | if (iprim && ifa1->ifa_mask == iprim->ifa_mask && | |
945 | inet_ifa_match(ifa1->ifa_address, iprim)) | |
946 | continue; | |
947 | ||
948 | /* Ignore ifa1 if it uses different primary IP (prefsrc) */ | |
949 | if (ifa1->ifa_flags & IFA_F_SECONDARY) { | |
950 | /* Another address from our subnet? */ | |
951 | if (ifa1->ifa_mask == prim->ifa_mask && | |
952 | inet_ifa_match(ifa1->ifa_address, prim)) | |
953 | prim1 = prim; | |
954 | else { | |
955 | /* We reached the secondaries, so | |
956 | * same_prefsrc should be determined. | |
957 | */ | |
958 | if (!same_prefsrc) | |
959 | continue; | |
960 | /* Search new prim1 if ifa1 is not | |
961 | * using the current prim1 | |
962 | */ | |
963 | if (!prim1 || | |
964 | ifa1->ifa_mask != prim1->ifa_mask || | |
965 | !inet_ifa_match(ifa1->ifa_address, prim1)) | |
966 | prim1 = inet_ifa_byprefix(in_dev, | |
967 | ifa1->ifa_address, | |
968 | ifa1->ifa_mask); | |
969 | if (!prim1) | |
970 | continue; | |
971 | if (prim1->ifa_local != prim->ifa_local) | |
972 | continue; | |
973 | } | |
974 | } else { | |
975 | if (prim->ifa_local != ifa1->ifa_local) | |
976 | continue; | |
977 | prim1 = ifa1; | |
978 | if (prim != prim1) | |
979 | same_prefsrc = 1; | |
980 | } | |
1da177e4 LT |
981 | if (ifa->ifa_local == ifa1->ifa_local) |
982 | ok |= LOCAL_OK; | |
983 | if (ifa->ifa_broadcast == ifa1->ifa_broadcast) | |
984 | ok |= BRD_OK; | |
985 | if (brd == ifa1->ifa_broadcast) | |
986 | ok |= BRD1_OK; | |
987 | if (any == ifa1->ifa_broadcast) | |
988 | ok |= BRD0_OK; | |
e6abbaa2 JA |
989 | /* primary has network specific broadcasts */ |
990 | if (prim1 == ifa1 && ifa1->ifa_prefixlen < 31) { | |
991 | __be32 brd1 = ifa1->ifa_address | ~ifa1->ifa_mask; | |
992 | __be32 any1 = ifa1->ifa_address & ifa1->ifa_mask; | |
993 | ||
994 | if (!ipv4_is_zeronet(any1)) { | |
995 | if (ifa->ifa_broadcast == brd1 || | |
996 | ifa->ifa_broadcast == any1) | |
997 | ok |= BRD_OK; | |
998 | if (brd == brd1 || brd == any1) | |
999 | ok |= BRD1_OK; | |
1000 | if (any == brd1 || any == any1) | |
1001 | ok |= BRD0_OK; | |
1002 | } | |
1003 | } | |
1da177e4 LT |
1004 | } |
1005 | ||
fbd40ea0 | 1006 | no_promotions: |
6a31d2a9 | 1007 | if (!(ok & BRD_OK)) |
1da177e4 | 1008 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim); |
e6abbaa2 JA |
1009 | if (subnet && ifa->ifa_prefixlen < 31) { |
1010 | if (!(ok & BRD1_OK)) | |
1011 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, brd, 32, prim); | |
1012 | if (!(ok & BRD0_OK)) | |
1013 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, any, 32, prim); | |
1014 | } | |
6a31d2a9 | 1015 | if (!(ok & LOCAL_OK)) { |
30bbaa19 DA |
1016 | unsigned int addr_type; |
1017 | ||
1da177e4 LT |
1018 | fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 32, prim); |
1019 | ||
1020 | /* Check, that this local address finally disappeared. */ | |
30bbaa19 DA |
1021 | addr_type = inet_addr_type_dev_table(dev_net(dev), dev, |
1022 | ifa->ifa_local); | |
1023 | if (gone && addr_type != RTN_LOCAL) { | |
1da177e4 | 1024 | /* And the last, but not the least thing. |
6a31d2a9 ED |
1025 | * We must flush stray FIB entries. |
1026 | * | |
1027 | * First of all, we scan fib_info list searching | |
1028 | * for stray nexthop entries, then ignite fib_flush. | |
1029 | */ | |
c346dca1 YH |
1030 | if (fib_sync_down_addr(dev_net(dev), ifa->ifa_local)) |
1031 | fib_flush(dev_net(dev)); | |
1da177e4 LT |
1032 | } |
1033 | } | |
1034 | #undef LOCAL_OK | |
1035 | #undef BRD_OK | |
1036 | #undef BRD0_OK | |
1037 | #undef BRD1_OK | |
1038 | } | |
1039 | ||
345e9b54 | 1040 | static void nl_fib_lookup(struct net *net, struct fib_result_nl *frn) |
246955fe | 1041 | { |
e905a9ed | 1042 | |
246955fe | 1043 | struct fib_result res; |
9ade2286 DM |
1044 | struct flowi4 fl4 = { |
1045 | .flowi4_mark = frn->fl_mark, | |
1046 | .daddr = frn->fl_addr, | |
1047 | .flowi4_tos = frn->fl_tos, | |
1048 | .flowi4_scope = frn->fl_scope, | |
6a31d2a9 | 1049 | }; |
345e9b54 AD |
1050 | struct fib_table *tb; |
1051 | ||
1052 | rcu_read_lock(); | |
1053 | ||
1054 | tb = fib_get_table(net, frn->tb_id_in); | |
1194ed0a AK |
1055 | |
1056 | frn->err = -ENOENT; | |
246955fe RO |
1057 | if (tb) { |
1058 | local_bh_disable(); | |
1059 | ||
1060 | frn->tb_id = tb->tb_id; | |
9ade2286 | 1061 | frn->err = fib_table_lookup(tb, &fl4, &res, FIB_LOOKUP_NOREF); |
246955fe RO |
1062 | |
1063 | if (!frn->err) { | |
1064 | frn->prefixlen = res.prefixlen; | |
1065 | frn->nh_sel = res.nh_sel; | |
1066 | frn->type = res.type; | |
1067 | frn->scope = res.scope; | |
1068 | } | |
1069 | local_bh_enable(); | |
1070 | } | |
345e9b54 AD |
1071 | |
1072 | rcu_read_unlock(); | |
246955fe RO |
1073 | } |
1074 | ||
28f7b036 | 1075 | static void nl_fib_input(struct sk_buff *skb) |
246955fe | 1076 | { |
6bd48fcf | 1077 | struct net *net; |
246955fe | 1078 | struct fib_result_nl *frn; |
28f7b036 | 1079 | struct nlmsghdr *nlh; |
15e47304 | 1080 | u32 portid; |
1194ed0a | 1081 | |
3b1e0a65 | 1082 | net = sock_net(skb->sk); |
b529ccf2 | 1083 | nlh = nlmsg_hdr(skb); |
573ce260 H |
1084 | if (skb->len < NLMSG_HDRLEN || skb->len < nlh->nlmsg_len || |
1085 | nlmsg_len(nlh) < sizeof(*frn)) | |
ea86575e | 1086 | return; |
d883a036 | 1087 | |
3a36515f | 1088 | skb = netlink_skb_clone(skb, GFP_KERNEL); |
51456b29 | 1089 | if (!skb) |
d883a036 DL |
1090 | return; |
1091 | nlh = nlmsg_hdr(skb); | |
e905a9ed | 1092 | |
573ce260 | 1093 | frn = (struct fib_result_nl *) nlmsg_data(nlh); |
345e9b54 | 1094 | nl_fib_lookup(net, frn); |
e905a9ed | 1095 | |
28a28283 | 1096 | portid = NETLINK_CB(skb).portid; /* netlink portid */ |
15e47304 | 1097 | NETLINK_CB(skb).portid = 0; /* from kernel */ |
ac6d439d | 1098 | NETLINK_CB(skb).dst_group = 0; /* unicast */ |
15e47304 | 1099 | netlink_unicast(net->ipv4.fibnl, skb, portid, MSG_DONTWAIT); |
e905a9ed | 1100 | } |
246955fe | 1101 | |
2c8c1e72 | 1102 | static int __net_init nl_fib_lookup_init(struct net *net) |
246955fe | 1103 | { |
6bd48fcf | 1104 | struct sock *sk; |
a31f2d17 PNA |
1105 | struct netlink_kernel_cfg cfg = { |
1106 | .input = nl_fib_input, | |
1107 | }; | |
1108 | ||
9f00d977 | 1109 | sk = netlink_kernel_create(net, NETLINK_FIB_LOOKUP, &cfg); |
51456b29 | 1110 | if (!sk) |
7b1a74fd | 1111 | return -EAFNOSUPPORT; |
6bd48fcf | 1112 | net->ipv4.fibnl = sk; |
7b1a74fd DL |
1113 | return 0; |
1114 | } | |
1115 | ||
1116 | static void nl_fib_lookup_exit(struct net *net) | |
1117 | { | |
b7c6ba6e | 1118 | netlink_kernel_release(net->ipv4.fibnl); |
775516bf | 1119 | net->ipv4.fibnl = NULL; |
246955fe RO |
1120 | } |
1121 | ||
4f823def JA |
1122 | static void fib_disable_ip(struct net_device *dev, unsigned long event, |
1123 | bool force) | |
1da177e4 | 1124 | { |
4f823def | 1125 | if (fib_sync_down_dev(dev, event, force)) |
c346dca1 | 1126 | fib_flush(dev_net(dev)); |
4ccfe6d4 | 1127 | rt_cache_flush(dev_net(dev)); |
1da177e4 LT |
1128 | arp_ifdown(dev); |
1129 | } | |
1130 | ||
1131 | static int fib_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1132 | { | |
6ed2533e | 1133 | struct in_ifaddr *ifa = (struct in_ifaddr *)ptr; |
76e6ebfb | 1134 | struct net_device *dev = ifa->ifa_dev->dev; |
436c3b66 | 1135 | struct net *net = dev_net(dev); |
1da177e4 LT |
1136 | |
1137 | switch (event) { | |
1138 | case NETDEV_UP: | |
1139 | fib_add_ifaddr(ifa); | |
1140 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
8a3d0316 | 1141 | fib_sync_up(dev, RTNH_F_DEAD); |
1da177e4 | 1142 | #endif |
436c3b66 | 1143 | atomic_inc(&net->ipv4.dev_addr_genid); |
4ccfe6d4 | 1144 | rt_cache_flush(dev_net(dev)); |
1da177e4 LT |
1145 | break; |
1146 | case NETDEV_DOWN: | |
e6abbaa2 | 1147 | fib_del_ifaddr(ifa, NULL); |
436c3b66 | 1148 | atomic_inc(&net->ipv4.dev_addr_genid); |
51456b29 | 1149 | if (!ifa->ifa_dev->ifa_list) { |
1da177e4 | 1150 | /* Last address was deleted from this interface. |
6a31d2a9 | 1151 | * Disable IP. |
1da177e4 | 1152 | */ |
4f823def | 1153 | fib_disable_ip(dev, event, true); |
1da177e4 | 1154 | } else { |
4ccfe6d4 | 1155 | rt_cache_flush(dev_net(dev)); |
1da177e4 LT |
1156 | } |
1157 | break; | |
1158 | } | |
1159 | return NOTIFY_DONE; | |
1160 | } | |
1161 | ||
1162 | static int fib_netdev_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1163 | { | |
351638e7 | 1164 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
7f49e7a3 | 1165 | struct netdev_notifier_changeupper_info *info; |
0115e8e3 | 1166 | struct in_device *in_dev; |
436c3b66 | 1167 | struct net *net = dev_net(dev); |
8a3d0316 | 1168 | unsigned int flags; |
1da177e4 LT |
1169 | |
1170 | if (event == NETDEV_UNREGISTER) { | |
4f823def | 1171 | fib_disable_ip(dev, event, true); |
caacf05e | 1172 | rt_flush_dev(dev); |
1da177e4 LT |
1173 | return NOTIFY_DONE; |
1174 | } | |
1175 | ||
0115e8e3 | 1176 | in_dev = __in_dev_get_rtnl(dev); |
a0065f26 OH |
1177 | if (!in_dev) |
1178 | return NOTIFY_DONE; | |
0115e8e3 | 1179 | |
1da177e4 LT |
1180 | switch (event) { |
1181 | case NETDEV_UP: | |
1182 | for_ifa(in_dev) { | |
1183 | fib_add_ifaddr(ifa); | |
1184 | } endfor_ifa(in_dev); | |
1185 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
8a3d0316 | 1186 | fib_sync_up(dev, RTNH_F_DEAD); |
1da177e4 | 1187 | #endif |
436c3b66 | 1188 | atomic_inc(&net->ipv4.dev_addr_genid); |
4ccfe6d4 | 1189 | rt_cache_flush(net); |
1da177e4 LT |
1190 | break; |
1191 | case NETDEV_DOWN: | |
4f823def | 1192 | fib_disable_ip(dev, event, false); |
1da177e4 | 1193 | break; |
1da177e4 | 1194 | case NETDEV_CHANGE: |
8a3d0316 AG |
1195 | flags = dev_get_flags(dev); |
1196 | if (flags & (IFF_RUNNING | IFF_LOWER_UP)) | |
1197 | fib_sync_up(dev, RTNH_F_LINKDOWN); | |
1198 | else | |
4f823def | 1199 | fib_sync_down_dev(dev, event, false); |
8a3d0316 AG |
1200 | /* fall through */ |
1201 | case NETDEV_CHANGEMTU: | |
4ccfe6d4 | 1202 | rt_cache_flush(net); |
1da177e4 | 1203 | break; |
7f49e7a3 DA |
1204 | case NETDEV_CHANGEUPPER: |
1205 | info = ptr; | |
1206 | /* flush all routes if dev is linked to or unlinked from | |
1207 | * an L3 master device (e.g., VRF) | |
1208 | */ | |
1209 | if (info->upper_dev && netif_is_l3_master(info->upper_dev)) | |
1210 | fib_disable_ip(dev, NETDEV_DOWN, true); | |
1211 | break; | |
1da177e4 LT |
1212 | } |
1213 | return NOTIFY_DONE; | |
1214 | } | |
1215 | ||
1216 | static struct notifier_block fib_inetaddr_notifier = { | |
6ed2533e | 1217 | .notifier_call = fib_inetaddr_event, |
1da177e4 LT |
1218 | }; |
1219 | ||
1220 | static struct notifier_block fib_netdev_notifier = { | |
6ed2533e | 1221 | .notifier_call = fib_netdev_event, |
1da177e4 LT |
1222 | }; |
1223 | ||
7b1a74fd | 1224 | static int __net_init ip_fib_net_init(struct net *net) |
1da177e4 | 1225 | { |
dce5cbee | 1226 | int err; |
10da66f7 ED |
1227 | size_t size = sizeof(struct hlist_head) * FIB_TABLE_HASHSZ; |
1228 | ||
1229 | /* Avoid false sharing : Use at least a full cache line */ | |
1230 | size = max_t(size_t, size, L1_CACHE_BYTES); | |
1af5a8c4 | 1231 | |
10da66f7 | 1232 | net->ipv4.fib_table_hash = kzalloc(size, GFP_KERNEL); |
51456b29 | 1233 | if (!net->ipv4.fib_table_hash) |
e4aef8ae DL |
1234 | return -ENOMEM; |
1235 | ||
dce5cbee DL |
1236 | err = fib4_rules_init(net); |
1237 | if (err < 0) | |
1238 | goto fail; | |
1239 | return 0; | |
1240 | ||
1241 | fail: | |
1242 | kfree(net->ipv4.fib_table_hash); | |
1243 | return err; | |
7b1a74fd | 1244 | } |
1da177e4 | 1245 | |
2c8c1e72 | 1246 | static void ip_fib_net_exit(struct net *net) |
7b1a74fd DL |
1247 | { |
1248 | unsigned int i; | |
1249 | ||
6dede75b | 1250 | rtnl_lock(); |
6e47d6ca AD |
1251 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
1252 | RCU_INIT_POINTER(net->ipv4.fib_local, NULL); | |
1253 | RCU_INIT_POINTER(net->ipv4.fib_main, NULL); | |
1254 | RCU_INIT_POINTER(net->ipv4.fib_default, NULL); | |
1255 | #endif | |
7b1a74fd | 1256 | for (i = 0; i < FIB_TABLE_HASHSZ; i++) { |
a7e53531 | 1257 | struct hlist_head *head = &net->ipv4.fib_table_hash[i]; |
b67bfe0d | 1258 | struct hlist_node *tmp; |
a7e53531 AD |
1259 | struct fib_table *tb; |
1260 | ||
b67bfe0d SL |
1261 | hlist_for_each_entry_safe(tb, tmp, head, tb_hlist) { |
1262 | hlist_del(&tb->tb_hlist); | |
6e47d6ca | 1263 | fib_table_flush(tb); |
4aa2c466 | 1264 | fib_free_table(tb); |
7b1a74fd DL |
1265 | } |
1266 | } | |
ad88d051 AD |
1267 | |
1268 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
1269 | fib4_rules_exit(net); | |
1270 | #endif | |
e2666f84 | 1271 | rtnl_unlock(); |
e4aef8ae | 1272 | kfree(net->ipv4.fib_table_hash); |
7b1a74fd DL |
1273 | } |
1274 | ||
1275 | static int __net_init fib_net_init(struct net *net) | |
1276 | { | |
1277 | int error; | |
1278 | ||
f4530fa5 DM |
1279 | #ifdef CONFIG_IP_ROUTE_CLASSID |
1280 | net->ipv4.fib_num_tclassid_users = 0; | |
1281 | #endif | |
7b1a74fd DL |
1282 | error = ip_fib_net_init(net); |
1283 | if (error < 0) | |
1284 | goto out; | |
1285 | error = nl_fib_lookup_init(net); | |
1286 | if (error < 0) | |
1287 | goto out_nlfl; | |
1288 | error = fib_proc_init(net); | |
1289 | if (error < 0) | |
1290 | goto out_proc; | |
1291 | out: | |
1292 | return error; | |
1293 | ||
1294 | out_proc: | |
1295 | nl_fib_lookup_exit(net); | |
1296 | out_nlfl: | |
1297 | ip_fib_net_exit(net); | |
1298 | goto out; | |
1299 | } | |
1300 | ||
1301 | static void __net_exit fib_net_exit(struct net *net) | |
1302 | { | |
1303 | fib_proc_exit(net); | |
1304 | nl_fib_lookup_exit(net); | |
1305 | ip_fib_net_exit(net); | |
1306 | } | |
1307 | ||
1308 | static struct pernet_operations fib_net_ops = { | |
1309 | .init = fib_net_init, | |
1310 | .exit = fib_net_exit, | |
1311 | }; | |
1312 | ||
1313 | void __init ip_fib_init(void) | |
1314 | { | |
c7ac8679 GR |
1315 | rtnl_register(PF_INET, RTM_NEWROUTE, inet_rtm_newroute, NULL, NULL); |
1316 | rtnl_register(PF_INET, RTM_DELROUTE, inet_rtm_delroute, NULL, NULL); | |
1317 | rtnl_register(PF_INET, RTM_GETROUTE, NULL, inet_dump_fib, NULL); | |
7b1a74fd DL |
1318 | |
1319 | register_pernet_subsys(&fib_net_ops); | |
1320 | register_netdevice_notifier(&fib_netdev_notifier); | |
1321 | register_inetaddr_notifier(&fib_inetaddr_notifier); | |
7f9b8052 | 1322 | |
5348ba85 | 1323 | fib_trie_init(); |
1da177e4 | 1324 | } |