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 | } | |
113 | ||
345e9b54 | 114 | /* caller must hold either rtnl or rcu read lock */ |
8ad4942c | 115 | struct fib_table *fib_get_table(struct net *net, u32 id) |
1af5a8c4 PM |
116 | { |
117 | struct fib_table *tb; | |
e4aef8ae | 118 | struct hlist_head *head; |
1af5a8c4 | 119 | unsigned int h; |
1da177e4 | 120 | |
1af5a8c4 PM |
121 | if (id == 0) |
122 | id = RT_TABLE_MAIN; | |
123 | h = id & (FIB_TABLE_HASHSZ - 1); | |
e4aef8ae | 124 | |
e4aef8ae | 125 | head = &net->ipv4.fib_table_hash[h]; |
b67bfe0d | 126 | hlist_for_each_entry_rcu(tb, head, tb_hlist) { |
345e9b54 | 127 | if (tb->tb_id == id) |
1af5a8c4 | 128 | return tb; |
1af5a8c4 | 129 | } |
1af5a8c4 PM |
130 | return NULL; |
131 | } | |
1da177e4 LT |
132 | #endif /* CONFIG_IP_MULTIPLE_TABLES */ |
133 | ||
0ddcf43d AD |
134 | static void fib_replace_table(struct net *net, struct fib_table *old, |
135 | struct fib_table *new) | |
136 | { | |
137 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
138 | switch (new->tb_id) { | |
139 | case RT_TABLE_LOCAL: | |
140 | rcu_assign_pointer(net->ipv4.fib_local, new); | |
141 | break; | |
142 | case RT_TABLE_MAIN: | |
143 | rcu_assign_pointer(net->ipv4.fib_main, new); | |
144 | break; | |
145 | case RT_TABLE_DEFAULT: | |
146 | rcu_assign_pointer(net->ipv4.fib_default, new); | |
147 | break; | |
148 | default: | |
149 | break; | |
150 | } | |
151 | ||
152 | #endif | |
153 | /* replace the old table in the hlist */ | |
154 | hlist_replace_rcu(&old->tb_hlist, &new->tb_hlist); | |
155 | } | |
156 | ||
157 | int fib_unmerge(struct net *net) | |
158 | { | |
159 | struct fib_table *old, *new; | |
160 | ||
3c9e9f73 | 161 | /* attempt to fetch local table if it has been allocated */ |
0ddcf43d | 162 | old = fib_get_table(net, RT_TABLE_LOCAL); |
3c9e9f73 AD |
163 | if (!old) |
164 | return 0; | |
0ddcf43d | 165 | |
3c9e9f73 | 166 | new = fib_trie_unmerge(old); |
0ddcf43d AD |
167 | if (!new) |
168 | return -ENOMEM; | |
169 | ||
170 | /* replace merged table with clean table */ | |
171 | if (new != old) { | |
172 | fib_replace_table(net, old, new); | |
173 | fib_free_table(old); | |
174 | } | |
175 | ||
176 | return 0; | |
177 | } | |
178 | ||
e4aef8ae | 179 | static void fib_flush(struct net *net) |
1da177e4 LT |
180 | { |
181 | int flushed = 0; | |
1af5a8c4 | 182 | unsigned int h; |
1da177e4 | 183 | |
1af5a8c4 | 184 | for (h = 0; h < FIB_TABLE_HASHSZ; h++) { |
a7e53531 AD |
185 | struct hlist_head *head = &net->ipv4.fib_table_hash[h]; |
186 | struct hlist_node *tmp; | |
187 | struct fib_table *tb; | |
188 | ||
189 | hlist_for_each_entry_safe(tb, tmp, head, tb_hlist) | |
16c6cf8b | 190 | flushed += fib_table_flush(tb); |
1da177e4 | 191 | } |
1da177e4 LT |
192 | |
193 | if (flushed) | |
4ccfe6d4 | 194 | rt_cache_flush(net); |
1da177e4 LT |
195 | } |
196 | ||
104616e7 SF |
197 | void fib_flush_external(struct net *net) |
198 | { | |
199 | struct fib_table *tb; | |
200 | struct hlist_head *head; | |
201 | unsigned int h; | |
202 | ||
203 | for (h = 0; h < FIB_TABLE_HASHSZ; h++) { | |
204 | head = &net->ipv4.fib_table_hash[h]; | |
205 | hlist_for_each_entry(tb, head, tb_hlist) | |
206 | fib_table_flush_external(tb); | |
207 | } | |
208 | } | |
209 | ||
05538116 LAT |
210 | /* |
211 | * Find address type as if only "dev" was present in the system. If | |
212 | * on_dev is NULL then all interfaces are taken into consideration. | |
213 | */ | |
95c96174 ED |
214 | static inline unsigned int __inet_dev_addr_type(struct net *net, |
215 | const struct net_device *dev, | |
9b8ff518 | 216 | __be32 addr, u32 tb_id) |
1da177e4 | 217 | { |
9ade2286 | 218 | struct flowi4 fl4 = { .daddr = addr }; |
1da177e4 | 219 | struct fib_result res; |
95c96174 | 220 | unsigned int ret = RTN_BROADCAST; |
15be405e | 221 | struct fib_table *table; |
1da177e4 | 222 | |
1e637c74 | 223 | if (ipv4_is_zeronet(addr) || ipv4_is_lbcast(addr)) |
1da177e4 | 224 | return RTN_BROADCAST; |
f97c1e0c | 225 | if (ipv4_is_multicast(addr)) |
1da177e4 LT |
226 | return RTN_MULTICAST; |
227 | ||
345e9b54 AD |
228 | rcu_read_lock(); |
229 | ||
15be405e DA |
230 | table = fib_get_table(net, tb_id); |
231 | if (table) { | |
1da177e4 | 232 | ret = RTN_UNICAST; |
15be405e | 233 | if (!fib_table_lookup(table, &fl4, &res, FIB_LOOKUP_NOREF)) { |
05538116 LAT |
234 | if (!dev || dev == res.fi->fib_dev) |
235 | ret = res.type; | |
1da177e4 LT |
236 | } |
237 | } | |
345e9b54 AD |
238 | |
239 | rcu_read_unlock(); | |
1da177e4 LT |
240 | return ret; |
241 | } | |
242 | ||
9b8ff518 | 243 | unsigned int inet_addr_type_table(struct net *net, __be32 addr, u32 tb_id) |
15be405e DA |
244 | { |
245 | return __inet_dev_addr_type(net, NULL, addr, tb_id); | |
246 | } | |
247 | EXPORT_SYMBOL(inet_addr_type_table); | |
248 | ||
6b175b26 | 249 | unsigned int inet_addr_type(struct net *net, __be32 addr) |
05538116 | 250 | { |
15be405e | 251 | return __inet_dev_addr_type(net, NULL, addr, RT_TABLE_LOCAL); |
05538116 | 252 | } |
4bc2f18b | 253 | EXPORT_SYMBOL(inet_addr_type); |
05538116 | 254 | |
6b175b26 EB |
255 | unsigned int inet_dev_addr_type(struct net *net, const struct net_device *dev, |
256 | __be32 addr) | |
05538116 | 257 | { |
3236b004 | 258 | u32 rt_table = l3mdev_fib_table(dev) ? : RT_TABLE_LOCAL; |
15be405e DA |
259 | |
260 | return __inet_dev_addr_type(net, dev, addr, rt_table); | |
05538116 | 261 | } |
4bc2f18b | 262 | EXPORT_SYMBOL(inet_dev_addr_type); |
05538116 | 263 | |
30bbaa19 DA |
264 | /* inet_addr_type with dev == NULL but using the table from a dev |
265 | * if one is associated | |
266 | */ | |
267 | unsigned int inet_addr_type_dev_table(struct net *net, | |
268 | const struct net_device *dev, | |
269 | __be32 addr) | |
270 | { | |
3236b004 | 271 | u32 rt_table = l3mdev_fib_table(dev) ? : RT_TABLE_LOCAL; |
30bbaa19 DA |
272 | |
273 | return __inet_dev_addr_type(net, NULL, addr, rt_table); | |
274 | } | |
275 | EXPORT_SYMBOL(inet_addr_type_dev_table); | |
276 | ||
35ebf65e DM |
277 | __be32 fib_compute_spec_dst(struct sk_buff *skb) |
278 | { | |
279 | struct net_device *dev = skb->dev; | |
280 | struct in_device *in_dev; | |
281 | struct fib_result res; | |
a207a4b2 | 282 | struct rtable *rt; |
35ebf65e | 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)) { | |
4cfc86f3 LR |
298 | struct flowi4 fl4 = { |
299 | .flowi4_iif = LOOPBACK_IFINDEX, | |
300 | .daddr = ip_hdr(skb)->saddr, | |
301 | .flowi4_tos = RT_TOS(ip_hdr(skb)->tos), | |
302 | .flowi4_scope = scope, | |
303 | .flowi4_mark = IN_DEV_SRC_VMARK(in_dev) ? skb->mark : 0, | |
304 | }; | |
0eeb075f | 305 | if (!fib_lookup(net, &fl4, &res, 0)) |
a207a4b2 DM |
306 | return FIB_RES_PREFSRC(net, res); |
307 | } else { | |
308 | scope = RT_SCOPE_LINK; | |
309 | } | |
310 | ||
311 | return inet_select_addr(dev, ip_hdr(skb)->saddr, scope); | |
35ebf65e DM |
312 | } |
313 | ||
1da177e4 | 314 | /* Given (packet source, input interface) and optional (dst, oif, tos): |
6a31d2a9 ED |
315 | * - (main) check, that source is valid i.e. not broadcast or our local |
316 | * address. | |
317 | * - figure out what "logical" interface this packet arrived | |
318 | * and calculate "specific destination" address. | |
319 | * - check, that packet arrived from expected physical interface. | |
ebc0ffae | 320 | * called with rcu_read_lock() |
1da177e4 | 321 | */ |
7a9bc9b8 DM |
322 | static int __fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst, |
323 | u8 tos, int oif, struct net_device *dev, | |
324 | int rpf, struct in_device *idev, u32 *itag) | |
1da177e4 | 325 | { |
1dced6a8 | 326 | int ret, no_addr; |
1da177e4 | 327 | struct fib_result res; |
9e56e380 | 328 | struct flowi4 fl4; |
5b707aaa | 329 | struct net *net; |
9e56e380 | 330 | bool dev_match; |
1da177e4 | 331 | |
9ade2286 | 332 | fl4.flowi4_oif = 0; |
385add90 | 333 | fl4.flowi4_iif = l3mdev_master_ifindex_rcu(dev); |
cd2fbe1b DA |
334 | if (!fl4.flowi4_iif) |
335 | fl4.flowi4_iif = oif ? : LOOPBACK_IFINDEX; | |
9ade2286 DM |
336 | fl4.daddr = src; |
337 | fl4.saddr = dst; | |
338 | fl4.flowi4_tos = tos; | |
339 | fl4.flowi4_scope = RT_SCOPE_UNIVERSE; | |
1b7179d3 | 340 | fl4.flowi4_tun_key.tun_id = 0; |
b84f7878 | 341 | fl4.flowi4_flags = 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 | |
f6d3c192 DA |
347 | trace_fib_validate_source(dev, &fl4); |
348 | ||
c346dca1 | 349 | net = dev_net(dev); |
0eeb075f | 350 | if (fib_lookup(net, &fl4, &res, 0)) |
1da177e4 | 351 | goto last_resort; |
1dced6a8 SB |
352 | if (res.type != RTN_UNICAST && |
353 | (res.type != RTN_LOCAL || !IN_DEV_ACCEPT_LOCAL(idev))) | |
354 | goto e_inval; | |
355 | if (!rpf && !fib_num_tclassid_users(dev_net(dev)) && | |
356 | (dev->ifindex != oif || !IN_DEV_TX_REDIRECTS(idev))) | |
357 | goto last_resort; | |
1da177e4 | 358 | fib_combine_itag(itag, &res); |
6f86b325 DM |
359 | dev_match = false; |
360 | ||
1da177e4 | 361 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
6f86b325 DM |
362 | for (ret = 0; ret < res.fi->fib_nhs; ret++) { |
363 | struct fib_nh *nh = &res.fi->fib_nh[ret]; | |
364 | ||
365 | if (nh->nh_dev == dev) { | |
366 | dev_match = true; | |
367 | break; | |
385add90 | 368 | } else if (l3mdev_master_ifindex_rcu(nh->nh_dev) == dev->ifindex) { |
cd2fbe1b DA |
369 | dev_match = true; |
370 | break; | |
6f86b325 DM |
371 | } |
372 | } | |
1da177e4 LT |
373 | #else |
374 | if (FIB_RES_DEV(res) == dev) | |
6f86b325 | 375 | dev_match = true; |
1da177e4 | 376 | #endif |
6f86b325 | 377 | if (dev_match) { |
1da177e4 | 378 | ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST; |
1da177e4 LT |
379 | return ret; |
380 | } | |
1da177e4 LT |
381 | if (no_addr) |
382 | goto last_resort; | |
c1cf8422 | 383 | if (rpf == 1) |
b5f7e755 | 384 | goto e_rpf; |
9ade2286 | 385 | fl4.flowi4_oif = dev->ifindex; |
1da177e4 LT |
386 | |
387 | ret = 0; | |
0eeb075f | 388 | if (fib_lookup(net, &fl4, &res, FIB_LOOKUP_IGNORE_LINKSTATE) == 0) { |
41347dcd | 389 | if (res.type == RTN_UNICAST) |
1da177e4 | 390 | ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST; |
1da177e4 LT |
391 | } |
392 | return ret; | |
393 | ||
394 | last_resort: | |
395 | if (rpf) | |
b5f7e755 | 396 | goto e_rpf; |
1da177e4 LT |
397 | *itag = 0; |
398 | return 0; | |
399 | ||
1da177e4 LT |
400 | e_inval: |
401 | return -EINVAL; | |
b5f7e755 ED |
402 | e_rpf: |
403 | return -EXDEV; | |
1da177e4 LT |
404 | } |
405 | ||
7a9bc9b8 DM |
406 | /* Ignore rp_filter for packets protected by IPsec. */ |
407 | int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst, | |
408 | u8 tos, int oif, struct net_device *dev, | |
409 | struct in_device *idev, u32 *itag) | |
410 | { | |
411 | int r = secpath_exists(skb) ? 0 : IN_DEV_RPFILTER(idev); | |
412 | ||
e81da0e1 | 413 | if (!r && !fib_num_tclassid_users(dev_net(dev)) && |
1dced6a8 | 414 | IN_DEV_ACCEPT_LOCAL(idev) && |
e81da0e1 | 415 | (dev->ifindex != oif || !IN_DEV_TX_REDIRECTS(idev))) { |
7a9bc9b8 DM |
416 | *itag = 0; |
417 | return 0; | |
418 | } | |
419 | return __fib_validate_source(skb, src, dst, tos, oif, dev, r, idev, itag); | |
420 | } | |
421 | ||
81f7bf6c | 422 | static inline __be32 sk_extract_addr(struct sockaddr *addr) |
4e902c57 TG |
423 | { |
424 | return ((struct sockaddr_in *) addr)->sin_addr.s_addr; | |
425 | } | |
426 | ||
427 | static int put_rtax(struct nlattr *mx, int len, int type, u32 value) | |
428 | { | |
429 | struct nlattr *nla; | |
430 | ||
431 | nla = (struct nlattr *) ((char *) mx + len); | |
432 | nla->nla_type = type; | |
433 | nla->nla_len = nla_attr_size(4); | |
434 | *(u32 *) nla_data(nla) = value; | |
435 | ||
436 | return len + nla_total_size(4); | |
437 | } | |
438 | ||
4b5d47d4 | 439 | static int rtentry_to_fib_config(struct net *net, int cmd, struct rtentry *rt, |
4e902c57 TG |
440 | struct fib_config *cfg) |
441 | { | |
6d85c10a | 442 | __be32 addr; |
4e902c57 TG |
443 | int plen; |
444 | ||
445 | memset(cfg, 0, sizeof(*cfg)); | |
4b5d47d4 | 446 | cfg->fc_nlinfo.nl_net = net; |
4e902c57 TG |
447 | |
448 | if (rt->rt_dst.sa_family != AF_INET) | |
449 | return -EAFNOSUPPORT; | |
450 | ||
451 | /* | |
452 | * Check mask for validity: | |
453 | * a) it must be contiguous. | |
454 | * b) destination must have all host bits clear. | |
455 | * c) if application forgot to set correct family (AF_INET), | |
456 | * reject request unless it is absolutely clear i.e. | |
457 | * both family and mask are zero. | |
458 | */ | |
459 | plen = 32; | |
460 | addr = sk_extract_addr(&rt->rt_dst); | |
461 | if (!(rt->rt_flags & RTF_HOST)) { | |
81f7bf6c | 462 | __be32 mask = sk_extract_addr(&rt->rt_genmask); |
4e902c57 TG |
463 | |
464 | if (rt->rt_genmask.sa_family != AF_INET) { | |
465 | if (mask || rt->rt_genmask.sa_family) | |
466 | return -EAFNOSUPPORT; | |
467 | } | |
468 | ||
469 | if (bad_mask(mask, addr)) | |
470 | return -EINVAL; | |
471 | ||
472 | plen = inet_mask_len(mask); | |
473 | } | |
474 | ||
475 | cfg->fc_dst_len = plen; | |
476 | cfg->fc_dst = addr; | |
477 | ||
478 | if (cmd != SIOCDELRT) { | |
479 | cfg->fc_nlflags = NLM_F_CREATE; | |
480 | cfg->fc_protocol = RTPROT_BOOT; | |
481 | } | |
482 | ||
483 | if (rt->rt_metric) | |
484 | cfg->fc_priority = rt->rt_metric - 1; | |
485 | ||
486 | if (rt->rt_flags & RTF_REJECT) { | |
487 | cfg->fc_scope = RT_SCOPE_HOST; | |
488 | cfg->fc_type = RTN_UNREACHABLE; | |
489 | return 0; | |
490 | } | |
491 | ||
492 | cfg->fc_scope = RT_SCOPE_NOWHERE; | |
493 | cfg->fc_type = RTN_UNICAST; | |
494 | ||
495 | if (rt->rt_dev) { | |
496 | char *colon; | |
497 | struct net_device *dev; | |
498 | char devname[IFNAMSIZ]; | |
499 | ||
500 | if (copy_from_user(devname, rt->rt_dev, IFNAMSIZ-1)) | |
501 | return -EFAULT; | |
502 | ||
503 | devname[IFNAMSIZ-1] = 0; | |
504 | colon = strchr(devname, ':'); | |
505 | if (colon) | |
506 | *colon = 0; | |
4b5d47d4 | 507 | dev = __dev_get_by_name(net, devname); |
4e902c57 TG |
508 | if (!dev) |
509 | return -ENODEV; | |
510 | cfg->fc_oif = dev->ifindex; | |
511 | if (colon) { | |
512 | struct in_ifaddr *ifa; | |
513 | struct in_device *in_dev = __in_dev_get_rtnl(dev); | |
514 | if (!in_dev) | |
515 | return -ENODEV; | |
516 | *colon = ':'; | |
517 | for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) | |
518 | if (strcmp(ifa->ifa_label, devname) == 0) | |
519 | break; | |
51456b29 | 520 | if (!ifa) |
4e902c57 TG |
521 | return -ENODEV; |
522 | cfg->fc_prefsrc = ifa->ifa_local; | |
523 | } | |
524 | } | |
525 | ||
526 | addr = sk_extract_addr(&rt->rt_gateway); | |
527 | if (rt->rt_gateway.sa_family == AF_INET && addr) { | |
30bbaa19 DA |
528 | unsigned int addr_type; |
529 | ||
4e902c57 | 530 | cfg->fc_gw = addr; |
30bbaa19 | 531 | addr_type = inet_addr_type_table(net, addr, cfg->fc_table); |
4e902c57 | 532 | if (rt->rt_flags & RTF_GATEWAY && |
30bbaa19 | 533 | addr_type == RTN_UNICAST) |
4e902c57 TG |
534 | cfg->fc_scope = RT_SCOPE_UNIVERSE; |
535 | } | |
536 | ||
537 | if (cmd == SIOCDELRT) | |
538 | return 0; | |
539 | ||
540 | if (rt->rt_flags & RTF_GATEWAY && !cfg->fc_gw) | |
541 | return -EINVAL; | |
542 | ||
543 | if (cfg->fc_scope == RT_SCOPE_NOWHERE) | |
544 | cfg->fc_scope = RT_SCOPE_LINK; | |
545 | ||
546 | if (rt->rt_flags & (RTF_MTU | RTF_WINDOW | RTF_IRTT)) { | |
547 | struct nlattr *mx; | |
548 | int len = 0; | |
549 | ||
550 | mx = kzalloc(3 * nla_total_size(4), GFP_KERNEL); | |
51456b29 | 551 | if (!mx) |
4e902c57 TG |
552 | return -ENOMEM; |
553 | ||
554 | if (rt->rt_flags & RTF_MTU) | |
555 | len = put_rtax(mx, len, RTAX_ADVMSS, rt->rt_mtu - 40); | |
556 | ||
557 | if (rt->rt_flags & RTF_WINDOW) | |
558 | len = put_rtax(mx, len, RTAX_WINDOW, rt->rt_window); | |
559 | ||
560 | if (rt->rt_flags & RTF_IRTT) | |
561 | len = put_rtax(mx, len, RTAX_RTT, rt->rt_irtt << 3); | |
562 | ||
563 | cfg->fc_mx = mx; | |
564 | cfg->fc_mx_len = len; | |
565 | } | |
566 | ||
567 | return 0; | |
568 | } | |
569 | ||
1da177e4 | 570 | /* |
6a31d2a9 ED |
571 | * Handle IP routing ioctl calls. |
572 | * These are used to manipulate the routing tables | |
1da177e4 | 573 | */ |
1bad118a | 574 | int ip_rt_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
1da177e4 | 575 | { |
4e902c57 TG |
576 | struct fib_config cfg; |
577 | struct rtentry rt; | |
1da177e4 | 578 | int err; |
1da177e4 LT |
579 | |
580 | switch (cmd) { | |
581 | case SIOCADDRT: /* Add a route */ | |
582 | case SIOCDELRT: /* Delete a route */ | |
52e804c6 | 583 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 | 584 | return -EPERM; |
4e902c57 TG |
585 | |
586 | if (copy_from_user(&rt, arg, sizeof(rt))) | |
1da177e4 | 587 | return -EFAULT; |
4e902c57 | 588 | |
1da177e4 | 589 | rtnl_lock(); |
1bad118a | 590 | err = rtentry_to_fib_config(net, cmd, &rt, &cfg); |
1da177e4 | 591 | if (err == 0) { |
4e902c57 TG |
592 | struct fib_table *tb; |
593 | ||
1da177e4 | 594 | if (cmd == SIOCDELRT) { |
1bad118a | 595 | tb = fib_get_table(net, cfg.fc_table); |
1da177e4 | 596 | if (tb) |
16c6cf8b | 597 | err = fib_table_delete(tb, &cfg); |
4e902c57 TG |
598 | else |
599 | err = -ESRCH; | |
1da177e4 | 600 | } else { |
1bad118a | 601 | tb = fib_new_table(net, cfg.fc_table); |
1da177e4 | 602 | if (tb) |
16c6cf8b | 603 | err = fib_table_insert(tb, &cfg); |
4e902c57 TG |
604 | else |
605 | err = -ENOBUFS; | |
1da177e4 | 606 | } |
4e902c57 TG |
607 | |
608 | /* allocated by rtentry_to_fib_config() */ | |
609 | kfree(cfg.fc_mx); | |
1da177e4 LT |
610 | } |
611 | rtnl_unlock(); | |
612 | return err; | |
613 | } | |
614 | return -EINVAL; | |
615 | } | |
616 | ||
6a31d2a9 | 617 | const struct nla_policy rtm_ipv4_policy[RTA_MAX + 1] = { |
4e902c57 TG |
618 | [RTA_DST] = { .type = NLA_U32 }, |
619 | [RTA_SRC] = { .type = NLA_U32 }, | |
620 | [RTA_IIF] = { .type = NLA_U32 }, | |
621 | [RTA_OIF] = { .type = NLA_U32 }, | |
622 | [RTA_GATEWAY] = { .type = NLA_U32 }, | |
623 | [RTA_PRIORITY] = { .type = NLA_U32 }, | |
624 | [RTA_PREFSRC] = { .type = NLA_U32 }, | |
625 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
5176f91e | 626 | [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) }, |
4e902c57 | 627 | [RTA_FLOW] = { .type = NLA_U32 }, |
571e7226 RP |
628 | [RTA_ENCAP_TYPE] = { .type = NLA_U16 }, |
629 | [RTA_ENCAP] = { .type = NLA_NESTED }, | |
4e902c57 TG |
630 | }; |
631 | ||
4b5d47d4 | 632 | static int rtm_to_fib_config(struct net *net, struct sk_buff *skb, |
6a31d2a9 | 633 | struct nlmsghdr *nlh, struct fib_config *cfg) |
1da177e4 | 634 | { |
4e902c57 TG |
635 | struct nlattr *attr; |
636 | int err, remaining; | |
637 | struct rtmsg *rtm; | |
638 | ||
639 | err = nlmsg_validate(nlh, sizeof(*rtm), RTA_MAX, rtm_ipv4_policy); | |
640 | if (err < 0) | |
641 | goto errout; | |
642 | ||
643 | memset(cfg, 0, sizeof(*cfg)); | |
644 | ||
645 | rtm = nlmsg_data(nlh); | |
4e902c57 | 646 | cfg->fc_dst_len = rtm->rtm_dst_len; |
4e902c57 TG |
647 | cfg->fc_tos = rtm->rtm_tos; |
648 | cfg->fc_table = rtm->rtm_table; | |
649 | cfg->fc_protocol = rtm->rtm_protocol; | |
650 | cfg->fc_scope = rtm->rtm_scope; | |
651 | cfg->fc_type = rtm->rtm_type; | |
652 | cfg->fc_flags = rtm->rtm_flags; | |
653 | cfg->fc_nlflags = nlh->nlmsg_flags; | |
654 | ||
15e47304 | 655 | cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid; |
4e902c57 | 656 | cfg->fc_nlinfo.nlh = nlh; |
4b5d47d4 | 657 | cfg->fc_nlinfo.nl_net = net; |
4e902c57 | 658 | |
a0ee18b9 TG |
659 | if (cfg->fc_type > RTN_MAX) { |
660 | err = -EINVAL; | |
661 | goto errout; | |
662 | } | |
663 | ||
4e902c57 | 664 | nlmsg_for_each_attr(attr, nlh, sizeof(struct rtmsg), remaining) { |
8f4c1f9b | 665 | switch (nla_type(attr)) { |
4e902c57 | 666 | case RTA_DST: |
17fb2c64 | 667 | cfg->fc_dst = nla_get_be32(attr); |
4e902c57 | 668 | break; |
4e902c57 TG |
669 | case RTA_OIF: |
670 | cfg->fc_oif = nla_get_u32(attr); | |
671 | break; | |
672 | case RTA_GATEWAY: | |
17fb2c64 | 673 | cfg->fc_gw = nla_get_be32(attr); |
4e902c57 TG |
674 | break; |
675 | case RTA_PRIORITY: | |
676 | cfg->fc_priority = nla_get_u32(attr); | |
677 | break; | |
678 | case RTA_PREFSRC: | |
17fb2c64 | 679 | cfg->fc_prefsrc = nla_get_be32(attr); |
4e902c57 TG |
680 | break; |
681 | case RTA_METRICS: | |
682 | cfg->fc_mx = nla_data(attr); | |
683 | cfg->fc_mx_len = nla_len(attr); | |
684 | break; | |
685 | case RTA_MULTIPATH: | |
686 | cfg->fc_mp = nla_data(attr); | |
687 | cfg->fc_mp_len = nla_len(attr); | |
688 | break; | |
689 | case RTA_FLOW: | |
690 | cfg->fc_flow = nla_get_u32(attr); | |
691 | break; | |
4e902c57 TG |
692 | case RTA_TABLE: |
693 | cfg->fc_table = nla_get_u32(attr); | |
694 | break; | |
571e7226 RP |
695 | case RTA_ENCAP: |
696 | cfg->fc_encap = attr; | |
697 | break; | |
698 | case RTA_ENCAP_TYPE: | |
699 | cfg->fc_encap_type = nla_get_u16(attr); | |
700 | break; | |
1da177e4 LT |
701 | } |
702 | } | |
4e902c57 | 703 | |
1da177e4 | 704 | return 0; |
4e902c57 TG |
705 | errout: |
706 | return err; | |
1da177e4 LT |
707 | } |
708 | ||
661d2967 | 709 | static int inet_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh) |
1da177e4 | 710 | { |
3b1e0a65 | 711 | struct net *net = sock_net(skb->sk); |
4e902c57 TG |
712 | struct fib_config cfg; |
713 | struct fib_table *tb; | |
714 | int err; | |
1da177e4 | 715 | |
4b5d47d4 | 716 | err = rtm_to_fib_config(net, skb, nlh, &cfg); |
4e902c57 TG |
717 | if (err < 0) |
718 | goto errout; | |
1da177e4 | 719 | |
8ad4942c | 720 | tb = fib_get_table(net, cfg.fc_table); |
51456b29 | 721 | if (!tb) { |
4e902c57 TG |
722 | err = -ESRCH; |
723 | goto errout; | |
724 | } | |
725 | ||
16c6cf8b | 726 | err = fib_table_delete(tb, &cfg); |
4e902c57 TG |
727 | errout: |
728 | return err; | |
1da177e4 LT |
729 | } |
730 | ||
661d2967 | 731 | static int inet_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh) |
1da177e4 | 732 | { |
3b1e0a65 | 733 | struct net *net = sock_net(skb->sk); |
4e902c57 TG |
734 | struct fib_config cfg; |
735 | struct fib_table *tb; | |
736 | int err; | |
1da177e4 | 737 | |
4b5d47d4 | 738 | err = rtm_to_fib_config(net, skb, nlh, &cfg); |
4e902c57 TG |
739 | if (err < 0) |
740 | goto errout; | |
1da177e4 | 741 | |
226b0b4a | 742 | tb = fib_new_table(net, cfg.fc_table); |
51456b29 | 743 | if (!tb) { |
4e902c57 TG |
744 | err = -ENOBUFS; |
745 | goto errout; | |
746 | } | |
747 | ||
16c6cf8b | 748 | err = fib_table_insert(tb, &cfg); |
4e902c57 TG |
749 | errout: |
750 | return err; | |
1da177e4 LT |
751 | } |
752 | ||
63f3444f | 753 | static int inet_dump_fib(struct sk_buff *skb, struct netlink_callback *cb) |
1da177e4 | 754 | { |
3b1e0a65 | 755 | struct net *net = sock_net(skb->sk); |
1af5a8c4 PM |
756 | unsigned int h, s_h; |
757 | unsigned int e = 0, s_e; | |
1da177e4 | 758 | struct fib_table *tb; |
e4aef8ae | 759 | struct hlist_head *head; |
1af5a8c4 | 760 | int dumped = 0; |
1da177e4 | 761 | |
be403ea1 TG |
762 | if (nlmsg_len(cb->nlh) >= sizeof(struct rtmsg) && |
763 | ((struct rtmsg *) nlmsg_data(cb->nlh))->rtm_flags & RTM_F_CLONED) | |
0b8c7f6f | 764 | return skb->len; |
1da177e4 | 765 | |
1af5a8c4 PM |
766 | s_h = cb->args[0]; |
767 | s_e = cb->args[1]; | |
768 | ||
a7e53531 AD |
769 | rcu_read_lock(); |
770 | ||
1af5a8c4 PM |
771 | for (h = s_h; h < FIB_TABLE_HASHSZ; h++, s_e = 0) { |
772 | e = 0; | |
e4aef8ae | 773 | head = &net->ipv4.fib_table_hash[h]; |
a7e53531 | 774 | hlist_for_each_entry_rcu(tb, head, tb_hlist) { |
1af5a8c4 PM |
775 | if (e < s_e) |
776 | goto next; | |
777 | if (dumped) | |
778 | memset(&cb->args[2], 0, sizeof(cb->args) - | |
e905a9ed | 779 | 2 * sizeof(cb->args[0])); |
16c6cf8b | 780 | if (fib_table_dump(tb, skb, cb) < 0) |
1af5a8c4 PM |
781 | goto out; |
782 | dumped = 1; | |
783 | next: | |
784 | e++; | |
785 | } | |
1da177e4 | 786 | } |
1af5a8c4 | 787 | out: |
a7e53531 AD |
788 | rcu_read_unlock(); |
789 | ||
1af5a8c4 PM |
790 | cb->args[1] = e; |
791 | cb->args[0] = h; | |
1da177e4 LT |
792 | |
793 | return skb->len; | |
794 | } | |
795 | ||
796 | /* Prepare and feed intra-kernel routing request. | |
6a31d2a9 ED |
797 | * Really, it should be netlink message, but :-( netlink |
798 | * can be not configured, so that we feed it directly | |
799 | * to fib engine. It is legal, because all events occur | |
800 | * only when netlink is already locked. | |
1da177e4 | 801 | */ |
81f7bf6c | 802 | static void fib_magic(int cmd, int type, __be32 dst, int dst_len, struct in_ifaddr *ifa) |
1da177e4 | 803 | { |
c346dca1 | 804 | struct net *net = dev_net(ifa->ifa_dev->dev); |
3236b004 | 805 | u32 tb_id = l3mdev_fib_table(ifa->ifa_dev->dev); |
4e902c57 TG |
806 | struct fib_table *tb; |
807 | struct fib_config cfg = { | |
808 | .fc_protocol = RTPROT_KERNEL, | |
809 | .fc_type = type, | |
810 | .fc_dst = dst, | |
811 | .fc_dst_len = dst_len, | |
812 | .fc_prefsrc = ifa->ifa_local, | |
813 | .fc_oif = ifa->ifa_dev->dev->ifindex, | |
814 | .fc_nlflags = NLM_F_CREATE | NLM_F_APPEND, | |
4d1169c1 | 815 | .fc_nlinfo = { |
4b5d47d4 | 816 | .nl_net = net, |
4d1169c1 | 817 | }, |
4e902c57 | 818 | }; |
1da177e4 | 819 | |
021dd3b8 DA |
820 | if (!tb_id) |
821 | tb_id = (type == RTN_UNICAST) ? RT_TABLE_MAIN : RT_TABLE_LOCAL; | |
1da177e4 | 822 | |
021dd3b8 | 823 | tb = fib_new_table(net, tb_id); |
51456b29 | 824 | if (!tb) |
1da177e4 LT |
825 | return; |
826 | ||
4e902c57 | 827 | cfg.fc_table = tb->tb_id; |
1da177e4 | 828 | |
4e902c57 TG |
829 | if (type != RTN_LOCAL) |
830 | cfg.fc_scope = RT_SCOPE_LINK; | |
831 | else | |
832 | cfg.fc_scope = RT_SCOPE_HOST; | |
1da177e4 LT |
833 | |
834 | if (cmd == RTM_NEWROUTE) | |
16c6cf8b | 835 | fib_table_insert(tb, &cfg); |
1da177e4 | 836 | else |
16c6cf8b | 837 | fib_table_delete(tb, &cfg); |
1da177e4 LT |
838 | } |
839 | ||
0ff60a45 | 840 | void fib_add_ifaddr(struct in_ifaddr *ifa) |
1da177e4 LT |
841 | { |
842 | struct in_device *in_dev = ifa->ifa_dev; | |
843 | struct net_device *dev = in_dev->dev; | |
844 | struct in_ifaddr *prim = ifa; | |
a144ea4b AV |
845 | __be32 mask = ifa->ifa_mask; |
846 | __be32 addr = ifa->ifa_local; | |
6a31d2a9 | 847 | __be32 prefix = ifa->ifa_address & mask; |
1da177e4 | 848 | |
6a31d2a9 | 849 | if (ifa->ifa_flags & IFA_F_SECONDARY) { |
1da177e4 | 850 | prim = inet_ifa_byprefix(in_dev, prefix, mask); |
51456b29 | 851 | if (!prim) { |
058bd4d2 | 852 | pr_warn("%s: bug: prim == NULL\n", __func__); |
1da177e4 LT |
853 | return; |
854 | } | |
855 | } | |
856 | ||
857 | fib_magic(RTM_NEWROUTE, RTN_LOCAL, addr, 32, prim); | |
858 | ||
6a31d2a9 | 859 | if (!(dev->flags & IFF_UP)) |
1da177e4 LT |
860 | return; |
861 | ||
862 | /* Add broadcast address, if it is explicitly assigned. */ | |
a144ea4b | 863 | if (ifa->ifa_broadcast && ifa->ifa_broadcast != htonl(0xFFFFFFFF)) |
1da177e4 LT |
864 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim); |
865 | ||
6a31d2a9 | 866 | if (!ipv4_is_zeronet(prefix) && !(ifa->ifa_flags & IFA_F_SECONDARY) && |
1da177e4 | 867 | (prefix != addr || ifa->ifa_prefixlen < 32)) { |
7b131180 PA |
868 | if (!(ifa->ifa_flags & IFA_F_NOPREFIXROUTE)) |
869 | fib_magic(RTM_NEWROUTE, | |
870 | dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST, | |
871 | prefix, ifa->ifa_prefixlen, prim); | |
1da177e4 LT |
872 | |
873 | /* Add network specific broadcasts, when it takes a sense */ | |
874 | if (ifa->ifa_prefixlen < 31) { | |
875 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix, 32, prim); | |
6a31d2a9 ED |
876 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix | ~mask, |
877 | 32, prim); | |
1da177e4 LT |
878 | } |
879 | } | |
880 | } | |
881 | ||
e6abbaa2 JA |
882 | /* Delete primary or secondary address. |
883 | * Optionally, on secondary address promotion consider the addresses | |
884 | * from subnet iprim as deleted, even if they are in device list. | |
885 | * In this case the secondary ifa can be in device list. | |
886 | */ | |
887 | void fib_del_ifaddr(struct in_ifaddr *ifa, struct in_ifaddr *iprim) | |
1da177e4 LT |
888 | { |
889 | struct in_device *in_dev = ifa->ifa_dev; | |
890 | struct net_device *dev = in_dev->dev; | |
891 | struct in_ifaddr *ifa1; | |
e6abbaa2 | 892 | struct in_ifaddr *prim = ifa, *prim1 = NULL; |
6a31d2a9 ED |
893 | __be32 brd = ifa->ifa_address | ~ifa->ifa_mask; |
894 | __be32 any = ifa->ifa_address & ifa->ifa_mask; | |
1da177e4 LT |
895 | #define LOCAL_OK 1 |
896 | #define BRD_OK 2 | |
897 | #define BRD0_OK 4 | |
898 | #define BRD1_OK 8 | |
95c96174 | 899 | unsigned int ok = 0; |
e6abbaa2 JA |
900 | int subnet = 0; /* Primary network */ |
901 | int gone = 1; /* Address is missing */ | |
902 | int same_prefsrc = 0; /* Another primary with same IP */ | |
1da177e4 | 903 | |
e6abbaa2 | 904 | if (ifa->ifa_flags & IFA_F_SECONDARY) { |
1da177e4 | 905 | prim = inet_ifa_byprefix(in_dev, any, ifa->ifa_mask); |
51456b29 | 906 | if (!prim) { |
058bd4d2 | 907 | pr_warn("%s: bug: prim == NULL\n", __func__); |
1da177e4 LT |
908 | return; |
909 | } | |
e6abbaa2 | 910 | if (iprim && iprim != prim) { |
058bd4d2 | 911 | pr_warn("%s: bug: iprim != prim\n", __func__); |
e6abbaa2 JA |
912 | return; |
913 | } | |
914 | } else if (!ipv4_is_zeronet(any) && | |
915 | (any != ifa->ifa_local || ifa->ifa_prefixlen < 32)) { | |
7b131180 PA |
916 | if (!(ifa->ifa_flags & IFA_F_NOPREFIXROUTE)) |
917 | fib_magic(RTM_DELROUTE, | |
918 | dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST, | |
919 | any, ifa->ifa_prefixlen, prim); | |
e6abbaa2 | 920 | subnet = 1; |
1da177e4 LT |
921 | } |
922 | ||
fbd40ea0 DM |
923 | if (in_dev->dead) |
924 | goto no_promotions; | |
925 | ||
1da177e4 | 926 | /* Deletion is more complicated than add. |
6a31d2a9 ED |
927 | * We should take care of not to delete too much :-) |
928 | * | |
929 | * Scan address list to be sure that addresses are really gone. | |
1da177e4 LT |
930 | */ |
931 | ||
932 | for (ifa1 = in_dev->ifa_list; ifa1; ifa1 = ifa1->ifa_next) { | |
e6abbaa2 JA |
933 | if (ifa1 == ifa) { |
934 | /* promotion, keep the IP */ | |
935 | gone = 0; | |
936 | continue; | |
937 | } | |
938 | /* Ignore IFAs from our subnet */ | |
939 | if (iprim && ifa1->ifa_mask == iprim->ifa_mask && | |
940 | inet_ifa_match(ifa1->ifa_address, iprim)) | |
941 | continue; | |
942 | ||
943 | /* Ignore ifa1 if it uses different primary IP (prefsrc) */ | |
944 | if (ifa1->ifa_flags & IFA_F_SECONDARY) { | |
945 | /* Another address from our subnet? */ | |
946 | if (ifa1->ifa_mask == prim->ifa_mask && | |
947 | inet_ifa_match(ifa1->ifa_address, prim)) | |
948 | prim1 = prim; | |
949 | else { | |
950 | /* We reached the secondaries, so | |
951 | * same_prefsrc should be determined. | |
952 | */ | |
953 | if (!same_prefsrc) | |
954 | continue; | |
955 | /* Search new prim1 if ifa1 is not | |
956 | * using the current prim1 | |
957 | */ | |
958 | if (!prim1 || | |
959 | ifa1->ifa_mask != prim1->ifa_mask || | |
960 | !inet_ifa_match(ifa1->ifa_address, prim1)) | |
961 | prim1 = inet_ifa_byprefix(in_dev, | |
962 | ifa1->ifa_address, | |
963 | ifa1->ifa_mask); | |
964 | if (!prim1) | |
965 | continue; | |
966 | if (prim1->ifa_local != prim->ifa_local) | |
967 | continue; | |
968 | } | |
969 | } else { | |
970 | if (prim->ifa_local != ifa1->ifa_local) | |
971 | continue; | |
972 | prim1 = ifa1; | |
973 | if (prim != prim1) | |
974 | same_prefsrc = 1; | |
975 | } | |
1da177e4 LT |
976 | if (ifa->ifa_local == ifa1->ifa_local) |
977 | ok |= LOCAL_OK; | |
978 | if (ifa->ifa_broadcast == ifa1->ifa_broadcast) | |
979 | ok |= BRD_OK; | |
980 | if (brd == ifa1->ifa_broadcast) | |
981 | ok |= BRD1_OK; | |
982 | if (any == ifa1->ifa_broadcast) | |
983 | ok |= BRD0_OK; | |
e6abbaa2 JA |
984 | /* primary has network specific broadcasts */ |
985 | if (prim1 == ifa1 && ifa1->ifa_prefixlen < 31) { | |
986 | __be32 brd1 = ifa1->ifa_address | ~ifa1->ifa_mask; | |
987 | __be32 any1 = ifa1->ifa_address & ifa1->ifa_mask; | |
988 | ||
989 | if (!ipv4_is_zeronet(any1)) { | |
990 | if (ifa->ifa_broadcast == brd1 || | |
991 | ifa->ifa_broadcast == any1) | |
992 | ok |= BRD_OK; | |
993 | if (brd == brd1 || brd == any1) | |
994 | ok |= BRD1_OK; | |
995 | if (any == brd1 || any == any1) | |
996 | ok |= BRD0_OK; | |
997 | } | |
998 | } | |
1da177e4 LT |
999 | } |
1000 | ||
fbd40ea0 | 1001 | no_promotions: |
6a31d2a9 | 1002 | if (!(ok & BRD_OK)) |
1da177e4 | 1003 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim); |
e6abbaa2 JA |
1004 | if (subnet && ifa->ifa_prefixlen < 31) { |
1005 | if (!(ok & BRD1_OK)) | |
1006 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, brd, 32, prim); | |
1007 | if (!(ok & BRD0_OK)) | |
1008 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, any, 32, prim); | |
1009 | } | |
6a31d2a9 | 1010 | if (!(ok & LOCAL_OK)) { |
30bbaa19 DA |
1011 | unsigned int addr_type; |
1012 | ||
1da177e4 LT |
1013 | fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 32, prim); |
1014 | ||
1015 | /* Check, that this local address finally disappeared. */ | |
30bbaa19 DA |
1016 | addr_type = inet_addr_type_dev_table(dev_net(dev), dev, |
1017 | ifa->ifa_local); | |
1018 | if (gone && addr_type != RTN_LOCAL) { | |
1da177e4 | 1019 | /* And the last, but not the least thing. |
6a31d2a9 ED |
1020 | * We must flush stray FIB entries. |
1021 | * | |
1022 | * First of all, we scan fib_info list searching | |
1023 | * for stray nexthop entries, then ignite fib_flush. | |
1024 | */ | |
c346dca1 YH |
1025 | if (fib_sync_down_addr(dev_net(dev), ifa->ifa_local)) |
1026 | fib_flush(dev_net(dev)); | |
1da177e4 LT |
1027 | } |
1028 | } | |
1029 | #undef LOCAL_OK | |
1030 | #undef BRD_OK | |
1031 | #undef BRD0_OK | |
1032 | #undef BRD1_OK | |
1033 | } | |
1034 | ||
345e9b54 | 1035 | static void nl_fib_lookup(struct net *net, struct fib_result_nl *frn) |
246955fe | 1036 | { |
e905a9ed | 1037 | |
246955fe | 1038 | struct fib_result res; |
9ade2286 DM |
1039 | struct flowi4 fl4 = { |
1040 | .flowi4_mark = frn->fl_mark, | |
1041 | .daddr = frn->fl_addr, | |
1042 | .flowi4_tos = frn->fl_tos, | |
1043 | .flowi4_scope = frn->fl_scope, | |
6a31d2a9 | 1044 | }; |
345e9b54 AD |
1045 | struct fib_table *tb; |
1046 | ||
1047 | rcu_read_lock(); | |
1048 | ||
1049 | tb = fib_get_table(net, frn->tb_id_in); | |
1194ed0a AK |
1050 | |
1051 | frn->err = -ENOENT; | |
246955fe RO |
1052 | if (tb) { |
1053 | local_bh_disable(); | |
1054 | ||
1055 | frn->tb_id = tb->tb_id; | |
9ade2286 | 1056 | frn->err = fib_table_lookup(tb, &fl4, &res, FIB_LOOKUP_NOREF); |
246955fe RO |
1057 | |
1058 | if (!frn->err) { | |
1059 | frn->prefixlen = res.prefixlen; | |
1060 | frn->nh_sel = res.nh_sel; | |
1061 | frn->type = res.type; | |
1062 | frn->scope = res.scope; | |
1063 | } | |
1064 | local_bh_enable(); | |
1065 | } | |
345e9b54 AD |
1066 | |
1067 | rcu_read_unlock(); | |
246955fe RO |
1068 | } |
1069 | ||
28f7b036 | 1070 | static void nl_fib_input(struct sk_buff *skb) |
246955fe | 1071 | { |
6bd48fcf | 1072 | struct net *net; |
246955fe | 1073 | struct fib_result_nl *frn; |
28f7b036 | 1074 | struct nlmsghdr *nlh; |
15e47304 | 1075 | u32 portid; |
1194ed0a | 1076 | |
3b1e0a65 | 1077 | net = sock_net(skb->sk); |
b529ccf2 | 1078 | nlh = nlmsg_hdr(skb); |
573ce260 H |
1079 | if (skb->len < NLMSG_HDRLEN || skb->len < nlh->nlmsg_len || |
1080 | nlmsg_len(nlh) < sizeof(*frn)) | |
ea86575e | 1081 | return; |
d883a036 | 1082 | |
3a36515f | 1083 | skb = netlink_skb_clone(skb, GFP_KERNEL); |
51456b29 | 1084 | if (!skb) |
d883a036 DL |
1085 | return; |
1086 | nlh = nlmsg_hdr(skb); | |
e905a9ed | 1087 | |
573ce260 | 1088 | frn = (struct fib_result_nl *) nlmsg_data(nlh); |
345e9b54 | 1089 | nl_fib_lookup(net, frn); |
e905a9ed | 1090 | |
28a28283 | 1091 | portid = NETLINK_CB(skb).portid; /* netlink portid */ |
15e47304 | 1092 | NETLINK_CB(skb).portid = 0; /* from kernel */ |
ac6d439d | 1093 | NETLINK_CB(skb).dst_group = 0; /* unicast */ |
15e47304 | 1094 | netlink_unicast(net->ipv4.fibnl, skb, portid, MSG_DONTWAIT); |
e905a9ed | 1095 | } |
246955fe | 1096 | |
2c8c1e72 | 1097 | static int __net_init nl_fib_lookup_init(struct net *net) |
246955fe | 1098 | { |
6bd48fcf | 1099 | struct sock *sk; |
a31f2d17 PNA |
1100 | struct netlink_kernel_cfg cfg = { |
1101 | .input = nl_fib_input, | |
1102 | }; | |
1103 | ||
9f00d977 | 1104 | sk = netlink_kernel_create(net, NETLINK_FIB_LOOKUP, &cfg); |
51456b29 | 1105 | if (!sk) |
7b1a74fd | 1106 | return -EAFNOSUPPORT; |
6bd48fcf | 1107 | net->ipv4.fibnl = sk; |
7b1a74fd DL |
1108 | return 0; |
1109 | } | |
1110 | ||
1111 | static void nl_fib_lookup_exit(struct net *net) | |
1112 | { | |
b7c6ba6e | 1113 | netlink_kernel_release(net->ipv4.fibnl); |
775516bf | 1114 | net->ipv4.fibnl = NULL; |
246955fe RO |
1115 | } |
1116 | ||
4f823def JA |
1117 | static void fib_disable_ip(struct net_device *dev, unsigned long event, |
1118 | bool force) | |
1da177e4 | 1119 | { |
4f823def | 1120 | if (fib_sync_down_dev(dev, event, force)) |
c346dca1 | 1121 | fib_flush(dev_net(dev)); |
4ccfe6d4 | 1122 | rt_cache_flush(dev_net(dev)); |
1da177e4 LT |
1123 | arp_ifdown(dev); |
1124 | } | |
1125 | ||
1126 | static int fib_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1127 | { | |
6ed2533e | 1128 | struct in_ifaddr *ifa = (struct in_ifaddr *)ptr; |
76e6ebfb | 1129 | struct net_device *dev = ifa->ifa_dev->dev; |
436c3b66 | 1130 | struct net *net = dev_net(dev); |
1da177e4 LT |
1131 | |
1132 | switch (event) { | |
1133 | case NETDEV_UP: | |
1134 | fib_add_ifaddr(ifa); | |
1135 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
8a3d0316 | 1136 | fib_sync_up(dev, RTNH_F_DEAD); |
1da177e4 | 1137 | #endif |
436c3b66 | 1138 | atomic_inc(&net->ipv4.dev_addr_genid); |
4ccfe6d4 | 1139 | rt_cache_flush(dev_net(dev)); |
1da177e4 LT |
1140 | break; |
1141 | case NETDEV_DOWN: | |
e6abbaa2 | 1142 | fib_del_ifaddr(ifa, NULL); |
436c3b66 | 1143 | atomic_inc(&net->ipv4.dev_addr_genid); |
51456b29 | 1144 | if (!ifa->ifa_dev->ifa_list) { |
1da177e4 | 1145 | /* Last address was deleted from this interface. |
6a31d2a9 | 1146 | * Disable IP. |
1da177e4 | 1147 | */ |
4f823def | 1148 | fib_disable_ip(dev, event, true); |
1da177e4 | 1149 | } else { |
4ccfe6d4 | 1150 | rt_cache_flush(dev_net(dev)); |
1da177e4 LT |
1151 | } |
1152 | break; | |
1153 | } | |
1154 | return NOTIFY_DONE; | |
1155 | } | |
1156 | ||
1157 | static int fib_netdev_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1158 | { | |
351638e7 | 1159 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
7f49e7a3 | 1160 | struct netdev_notifier_changeupper_info *info; |
0115e8e3 | 1161 | struct in_device *in_dev; |
436c3b66 | 1162 | struct net *net = dev_net(dev); |
8a3d0316 | 1163 | unsigned int flags; |
1da177e4 LT |
1164 | |
1165 | if (event == NETDEV_UNREGISTER) { | |
4f823def | 1166 | fib_disable_ip(dev, event, true); |
caacf05e | 1167 | rt_flush_dev(dev); |
1da177e4 LT |
1168 | return NOTIFY_DONE; |
1169 | } | |
1170 | ||
0115e8e3 | 1171 | in_dev = __in_dev_get_rtnl(dev); |
a0065f26 OH |
1172 | if (!in_dev) |
1173 | return NOTIFY_DONE; | |
0115e8e3 | 1174 | |
1da177e4 LT |
1175 | switch (event) { |
1176 | case NETDEV_UP: | |
1177 | for_ifa(in_dev) { | |
1178 | fib_add_ifaddr(ifa); | |
1179 | } endfor_ifa(in_dev); | |
1180 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
8a3d0316 | 1181 | fib_sync_up(dev, RTNH_F_DEAD); |
1da177e4 | 1182 | #endif |
436c3b66 | 1183 | atomic_inc(&net->ipv4.dev_addr_genid); |
4ccfe6d4 | 1184 | rt_cache_flush(net); |
1da177e4 LT |
1185 | break; |
1186 | case NETDEV_DOWN: | |
4f823def | 1187 | fib_disable_ip(dev, event, false); |
1da177e4 | 1188 | break; |
1da177e4 | 1189 | case NETDEV_CHANGE: |
8a3d0316 AG |
1190 | flags = dev_get_flags(dev); |
1191 | if (flags & (IFF_RUNNING | IFF_LOWER_UP)) | |
1192 | fib_sync_up(dev, RTNH_F_LINKDOWN); | |
1193 | else | |
4f823def | 1194 | fib_sync_down_dev(dev, event, false); |
8a3d0316 AG |
1195 | /* fall through */ |
1196 | case NETDEV_CHANGEMTU: | |
4ccfe6d4 | 1197 | rt_cache_flush(net); |
1da177e4 | 1198 | break; |
7f49e7a3 DA |
1199 | case NETDEV_CHANGEUPPER: |
1200 | info = ptr; | |
1201 | /* flush all routes if dev is linked to or unlinked from | |
1202 | * an L3 master device (e.g., VRF) | |
1203 | */ | |
1204 | if (info->upper_dev && netif_is_l3_master(info->upper_dev)) | |
1205 | fib_disable_ip(dev, NETDEV_DOWN, true); | |
1206 | break; | |
1da177e4 LT |
1207 | } |
1208 | return NOTIFY_DONE; | |
1209 | } | |
1210 | ||
1211 | static struct notifier_block fib_inetaddr_notifier = { | |
6ed2533e | 1212 | .notifier_call = fib_inetaddr_event, |
1da177e4 LT |
1213 | }; |
1214 | ||
1215 | static struct notifier_block fib_netdev_notifier = { | |
6ed2533e | 1216 | .notifier_call = fib_netdev_event, |
1da177e4 LT |
1217 | }; |
1218 | ||
7b1a74fd | 1219 | static int __net_init ip_fib_net_init(struct net *net) |
1da177e4 | 1220 | { |
dce5cbee | 1221 | int err; |
10da66f7 ED |
1222 | size_t size = sizeof(struct hlist_head) * FIB_TABLE_HASHSZ; |
1223 | ||
1224 | /* Avoid false sharing : Use at least a full cache line */ | |
1225 | size = max_t(size_t, size, L1_CACHE_BYTES); | |
1af5a8c4 | 1226 | |
10da66f7 | 1227 | net->ipv4.fib_table_hash = kzalloc(size, GFP_KERNEL); |
51456b29 | 1228 | if (!net->ipv4.fib_table_hash) |
e4aef8ae DL |
1229 | return -ENOMEM; |
1230 | ||
dce5cbee DL |
1231 | err = fib4_rules_init(net); |
1232 | if (err < 0) | |
1233 | goto fail; | |
1234 | return 0; | |
1235 | ||
1236 | fail: | |
1237 | kfree(net->ipv4.fib_table_hash); | |
1238 | return err; | |
7b1a74fd | 1239 | } |
1da177e4 | 1240 | |
2c8c1e72 | 1241 | static void ip_fib_net_exit(struct net *net) |
7b1a74fd DL |
1242 | { |
1243 | unsigned int i; | |
1244 | ||
6dede75b | 1245 | rtnl_lock(); |
6e47d6ca AD |
1246 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
1247 | RCU_INIT_POINTER(net->ipv4.fib_local, NULL); | |
1248 | RCU_INIT_POINTER(net->ipv4.fib_main, NULL); | |
1249 | RCU_INIT_POINTER(net->ipv4.fib_default, NULL); | |
1250 | #endif | |
7b1a74fd | 1251 | for (i = 0; i < FIB_TABLE_HASHSZ; i++) { |
a7e53531 | 1252 | struct hlist_head *head = &net->ipv4.fib_table_hash[i]; |
b67bfe0d | 1253 | struct hlist_node *tmp; |
a7e53531 AD |
1254 | struct fib_table *tb; |
1255 | ||
b67bfe0d SL |
1256 | hlist_for_each_entry_safe(tb, tmp, head, tb_hlist) { |
1257 | hlist_del(&tb->tb_hlist); | |
6e47d6ca | 1258 | fib_table_flush(tb); |
4aa2c466 | 1259 | fib_free_table(tb); |
7b1a74fd DL |
1260 | } |
1261 | } | |
ad88d051 AD |
1262 | |
1263 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
1264 | fib4_rules_exit(net); | |
1265 | #endif | |
e2666f84 | 1266 | rtnl_unlock(); |
e4aef8ae | 1267 | kfree(net->ipv4.fib_table_hash); |
7b1a74fd DL |
1268 | } |
1269 | ||
1270 | static int __net_init fib_net_init(struct net *net) | |
1271 | { | |
1272 | int error; | |
1273 | ||
f4530fa5 DM |
1274 | #ifdef CONFIG_IP_ROUTE_CLASSID |
1275 | net->ipv4.fib_num_tclassid_users = 0; | |
1276 | #endif | |
7b1a74fd DL |
1277 | error = ip_fib_net_init(net); |
1278 | if (error < 0) | |
1279 | goto out; | |
1280 | error = nl_fib_lookup_init(net); | |
1281 | if (error < 0) | |
1282 | goto out_nlfl; | |
1283 | error = fib_proc_init(net); | |
1284 | if (error < 0) | |
1285 | goto out_proc; | |
1286 | out: | |
1287 | return error; | |
1288 | ||
1289 | out_proc: | |
1290 | nl_fib_lookup_exit(net); | |
1291 | out_nlfl: | |
1292 | ip_fib_net_exit(net); | |
1293 | goto out; | |
1294 | } | |
1295 | ||
1296 | static void __net_exit fib_net_exit(struct net *net) | |
1297 | { | |
1298 | fib_proc_exit(net); | |
1299 | nl_fib_lookup_exit(net); | |
1300 | ip_fib_net_exit(net); | |
1301 | } | |
1302 | ||
1303 | static struct pernet_operations fib_net_ops = { | |
1304 | .init = fib_net_init, | |
1305 | .exit = fib_net_exit, | |
1306 | }; | |
1307 | ||
1308 | void __init ip_fib_init(void) | |
1309 | { | |
c7ac8679 GR |
1310 | rtnl_register(PF_INET, RTM_NEWROUTE, inet_rtm_newroute, NULL, NULL); |
1311 | rtnl_register(PF_INET, RTM_DELROUTE, inet_rtm_delroute, NULL, NULL); | |
1312 | rtnl_register(PF_INET, RTM_GETROUTE, NULL, inet_dump_fib, NULL); | |
7b1a74fd DL |
1313 | |
1314 | register_pernet_subsys(&fib_net_ops); | |
1315 | register_netdevice_notifier(&fib_netdev_notifier); | |
1316 | register_inetaddr_notifier(&fib_inetaddr_notifier); | |
7f9b8052 | 1317 | |
5348ba85 | 1318 | fib_trie_init(); |
1da177e4 | 1319 | } |