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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * INET An implementation of the TCP/IP protocol suite for the LINUX | |
3 | * operating system. INET is implemented using the BSD Socket | |
4 | * interface as the means of communication with the user level. | |
5 | * | |
6 | * IPv4 Forwarding Information Base: FIB frontend. | |
7 | * | |
1da177e4 LT |
8 | * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> |
9 | * | |
10 | * This program is free software; you can redistribute it and/or | |
11 | * modify it under the terms of the GNU General Public License | |
12 | * as published by the Free Software Foundation; either version | |
13 | * 2 of the License, or (at your option) any later version. | |
14 | */ | |
15 | ||
1da177e4 | 16 | #include <linux/module.h> |
7c0f6ba6 | 17 | #include <linux/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> |
9ed59592 | 49 | #include <net/lwtunnel.h> |
f6d3c192 | 50 | #include <trace/events/fib.h> |
1da177e4 | 51 | |
1da177e4 LT |
52 | #ifndef CONFIG_IP_MULTIPLE_TABLES |
53 | ||
7b1a74fd | 54 | static int __net_init fib4_rules_init(struct net *net) |
c3e9a353 | 55 | { |
93456b6d DL |
56 | struct fib_table *local_table, *main_table; |
57 | ||
0ddcf43d | 58 | main_table = fib_trie_table(RT_TABLE_MAIN, NULL); |
51456b29 | 59 | if (!main_table) |
61f0d861 | 60 | return -ENOMEM; |
dbb50165 | 61 | |
0ddcf43d | 62 | local_table = fib_trie_table(RT_TABLE_LOCAL, main_table); |
51456b29 | 63 | if (!local_table) |
61f0d861 | 64 | goto fail; |
0ddcf43d | 65 | |
93456b6d | 66 | hlist_add_head_rcu(&local_table->tb_hlist, |
e4aef8ae | 67 | &net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX]); |
93456b6d | 68 | hlist_add_head_rcu(&main_table->tb_hlist, |
e4aef8ae | 69 | &net->ipv4.fib_table_hash[TABLE_MAIN_INDEX]); |
dbb50165 DL |
70 | return 0; |
71 | ||
72 | fail: | |
61f0d861 | 73 | fib_free_table(main_table); |
dbb50165 | 74 | return -ENOMEM; |
c3e9a353 | 75 | } |
032a4802 PA |
76 | |
77 | static bool fib4_has_custom_rules(struct net *net) | |
78 | { | |
79 | return false; | |
80 | } | |
1af5a8c4 | 81 | #else |
1da177e4 | 82 | |
8ad4942c | 83 | struct fib_table *fib_new_table(struct net *net, u32 id) |
1da177e4 | 84 | { |
0ddcf43d | 85 | struct fib_table *tb, *alias = NULL; |
1af5a8c4 | 86 | unsigned int h; |
1da177e4 | 87 | |
1af5a8c4 PM |
88 | if (id == 0) |
89 | id = RT_TABLE_MAIN; | |
8ad4942c | 90 | tb = fib_get_table(net, id); |
1af5a8c4 PM |
91 | if (tb) |
92 | return tb; | |
7f9b8052 | 93 | |
5350d54f | 94 | if (id == RT_TABLE_LOCAL && !net->ipv4.fib_has_custom_rules) |
0ddcf43d AD |
95 | alias = fib_new_table(net, RT_TABLE_MAIN); |
96 | ||
97 | tb = fib_trie_table(id, alias); | |
1da177e4 LT |
98 | if (!tb) |
99 | return NULL; | |
f4530fa5 DM |
100 | |
101 | switch (id) { | |
f4530fa5 | 102 | case RT_TABLE_MAIN: |
a7e53531 | 103 | rcu_assign_pointer(net->ipv4.fib_main, tb); |
f4530fa5 | 104 | break; |
f4530fa5 | 105 | case RT_TABLE_DEFAULT: |
a7e53531 | 106 | rcu_assign_pointer(net->ipv4.fib_default, tb); |
f4530fa5 | 107 | break; |
f4530fa5 DM |
108 | default: |
109 | break; | |
110 | } | |
111 | ||
1af5a8c4 | 112 | h = id & (FIB_TABLE_HASHSZ - 1); |
e4aef8ae | 113 | hlist_add_head_rcu(&tb->tb_hlist, &net->ipv4.fib_table_hash[h]); |
1da177e4 LT |
114 | return tb; |
115 | } | |
b3b4663c | 116 | EXPORT_SYMBOL_GPL(fib_new_table); |
1da177e4 | 117 | |
345e9b54 | 118 | /* caller must hold either rtnl or rcu read lock */ |
8ad4942c | 119 | struct fib_table *fib_get_table(struct net *net, u32 id) |
1af5a8c4 PM |
120 | { |
121 | struct fib_table *tb; | |
e4aef8ae | 122 | struct hlist_head *head; |
1af5a8c4 | 123 | unsigned int h; |
1da177e4 | 124 | |
1af5a8c4 PM |
125 | if (id == 0) |
126 | id = RT_TABLE_MAIN; | |
127 | h = id & (FIB_TABLE_HASHSZ - 1); | |
e4aef8ae | 128 | |
e4aef8ae | 129 | head = &net->ipv4.fib_table_hash[h]; |
b67bfe0d | 130 | hlist_for_each_entry_rcu(tb, head, tb_hlist) { |
345e9b54 | 131 | if (tb->tb_id == id) |
1af5a8c4 | 132 | return tb; |
1af5a8c4 | 133 | } |
1af5a8c4 PM |
134 | return NULL; |
135 | } | |
032a4802 PA |
136 | |
137 | static bool fib4_has_custom_rules(struct net *net) | |
138 | { | |
139 | return net->ipv4.fib_has_custom_rules; | |
140 | } | |
1da177e4 LT |
141 | #endif /* CONFIG_IP_MULTIPLE_TABLES */ |
142 | ||
0ddcf43d AD |
143 | static void fib_replace_table(struct net *net, struct fib_table *old, |
144 | struct fib_table *new) | |
145 | { | |
146 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
147 | switch (new->tb_id) { | |
0ddcf43d AD |
148 | case RT_TABLE_MAIN: |
149 | rcu_assign_pointer(net->ipv4.fib_main, new); | |
150 | break; | |
151 | case RT_TABLE_DEFAULT: | |
152 | rcu_assign_pointer(net->ipv4.fib_default, new); | |
153 | break; | |
154 | default: | |
155 | break; | |
156 | } | |
157 | ||
158 | #endif | |
159 | /* replace the old table in the hlist */ | |
160 | hlist_replace_rcu(&old->tb_hlist, &new->tb_hlist); | |
161 | } | |
162 | ||
163 | int fib_unmerge(struct net *net) | |
164 | { | |
3b709334 | 165 | struct fib_table *old, *new, *main_table; |
0ddcf43d | 166 | |
3c9e9f73 | 167 | /* attempt to fetch local table if it has been allocated */ |
0ddcf43d | 168 | old = fib_get_table(net, RT_TABLE_LOCAL); |
3c9e9f73 AD |
169 | if (!old) |
170 | return 0; | |
0ddcf43d | 171 | |
3c9e9f73 | 172 | new = fib_trie_unmerge(old); |
0ddcf43d AD |
173 | if (!new) |
174 | return -ENOMEM; | |
175 | ||
3b709334 AD |
176 | /* table is already unmerged */ |
177 | if (new == old) | |
178 | return 0; | |
179 | ||
0ddcf43d | 180 | /* replace merged table with clean table */ |
3b709334 AD |
181 | fib_replace_table(net, old, new); |
182 | fib_free_table(old); | |
183 | ||
184 | /* attempt to fetch main table if it has been allocated */ | |
185 | main_table = fib_get_table(net, RT_TABLE_MAIN); | |
186 | if (!main_table) | |
187 | return 0; | |
188 | ||
189 | /* flush local entries from main table */ | |
190 | fib_table_flush_external(main_table); | |
0ddcf43d AD |
191 | |
192 | return 0; | |
193 | } | |
194 | ||
e4aef8ae | 195 | static void fib_flush(struct net *net) |
1da177e4 LT |
196 | { |
197 | int flushed = 0; | |
1af5a8c4 | 198 | unsigned int h; |
1da177e4 | 199 | |
1af5a8c4 | 200 | for (h = 0; h < FIB_TABLE_HASHSZ; h++) { |
a7e53531 AD |
201 | struct hlist_head *head = &net->ipv4.fib_table_hash[h]; |
202 | struct hlist_node *tmp; | |
203 | struct fib_table *tb; | |
204 | ||
205 | hlist_for_each_entry_safe(tb, tmp, head, tb_hlist) | |
b90eb754 | 206 | flushed += fib_table_flush(net, tb); |
1da177e4 | 207 | } |
1da177e4 LT |
208 | |
209 | if (flushed) | |
4ccfe6d4 | 210 | rt_cache_flush(net); |
1da177e4 LT |
211 | } |
212 | ||
05538116 LAT |
213 | /* |
214 | * Find address type as if only "dev" was present in the system. If | |
215 | * on_dev is NULL then all interfaces are taken into consideration. | |
216 | */ | |
95c96174 ED |
217 | static inline unsigned int __inet_dev_addr_type(struct net *net, |
218 | const struct net_device *dev, | |
9b8ff518 | 219 | __be32 addr, u32 tb_id) |
1da177e4 | 220 | { |
9ade2286 | 221 | struct flowi4 fl4 = { .daddr = addr }; |
1da177e4 | 222 | struct fib_result res; |
95c96174 | 223 | unsigned int ret = RTN_BROADCAST; |
15be405e | 224 | struct fib_table *table; |
1da177e4 | 225 | |
1e637c74 | 226 | if (ipv4_is_zeronet(addr) || ipv4_is_lbcast(addr)) |
1da177e4 | 227 | return RTN_BROADCAST; |
f97c1e0c | 228 | if (ipv4_is_multicast(addr)) |
1da177e4 LT |
229 | return RTN_MULTICAST; |
230 | ||
345e9b54 AD |
231 | rcu_read_lock(); |
232 | ||
15be405e DA |
233 | table = fib_get_table(net, tb_id); |
234 | if (table) { | |
1da177e4 | 235 | ret = RTN_UNICAST; |
15be405e | 236 | if (!fib_table_lookup(table, &fl4, &res, FIB_LOOKUP_NOREF)) { |
05538116 LAT |
237 | if (!dev || dev == res.fi->fib_dev) |
238 | ret = res.type; | |
1da177e4 LT |
239 | } |
240 | } | |
345e9b54 AD |
241 | |
242 | rcu_read_unlock(); | |
1da177e4 LT |
243 | return ret; |
244 | } | |
245 | ||
9b8ff518 | 246 | unsigned int inet_addr_type_table(struct net *net, __be32 addr, u32 tb_id) |
15be405e DA |
247 | { |
248 | return __inet_dev_addr_type(net, NULL, addr, tb_id); | |
249 | } | |
250 | EXPORT_SYMBOL(inet_addr_type_table); | |
251 | ||
6b175b26 | 252 | unsigned int inet_addr_type(struct net *net, __be32 addr) |
05538116 | 253 | { |
15be405e | 254 | return __inet_dev_addr_type(net, NULL, addr, RT_TABLE_LOCAL); |
05538116 | 255 | } |
4bc2f18b | 256 | EXPORT_SYMBOL(inet_addr_type); |
05538116 | 257 | |
6b175b26 EB |
258 | unsigned int inet_dev_addr_type(struct net *net, const struct net_device *dev, |
259 | __be32 addr) | |
05538116 | 260 | { |
3236b004 | 261 | u32 rt_table = l3mdev_fib_table(dev) ? : RT_TABLE_LOCAL; |
15be405e DA |
262 | |
263 | return __inet_dev_addr_type(net, dev, addr, rt_table); | |
05538116 | 264 | } |
4bc2f18b | 265 | EXPORT_SYMBOL(inet_dev_addr_type); |
05538116 | 266 | |
30bbaa19 DA |
267 | /* inet_addr_type with dev == NULL but using the table from a dev |
268 | * if one is associated | |
269 | */ | |
270 | unsigned int inet_addr_type_dev_table(struct net *net, | |
271 | const struct net_device *dev, | |
272 | __be32 addr) | |
273 | { | |
3236b004 | 274 | u32 rt_table = l3mdev_fib_table(dev) ? : RT_TABLE_LOCAL; |
30bbaa19 DA |
275 | |
276 | return __inet_dev_addr_type(net, NULL, addr, rt_table); | |
277 | } | |
278 | EXPORT_SYMBOL(inet_addr_type_dev_table); | |
279 | ||
35ebf65e DM |
280 | __be32 fib_compute_spec_dst(struct sk_buff *skb) |
281 | { | |
282 | struct net_device *dev = skb->dev; | |
283 | struct in_device *in_dev; | |
284 | struct fib_result res; | |
a207a4b2 | 285 | struct rtable *rt; |
35ebf65e | 286 | struct net *net; |
a207a4b2 | 287 | int scope; |
35ebf65e | 288 | |
a207a4b2 | 289 | rt = skb_rtable(skb); |
0cc535a2 JA |
290 | if ((rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST | RTCF_LOCAL)) == |
291 | RTCF_LOCAL) | |
35ebf65e DM |
292 | return ip_hdr(skb)->daddr; |
293 | ||
294 | in_dev = __in_dev_get_rcu(dev); | |
295 | BUG_ON(!in_dev); | |
35ebf65e DM |
296 | |
297 | net = dev_net(dev); | |
a207a4b2 DM |
298 | |
299 | scope = RT_SCOPE_UNIVERSE; | |
300 | if (!ipv4_is_zeronet(ip_hdr(skb)->saddr)) { | |
4cfc86f3 LR |
301 | struct flowi4 fl4 = { |
302 | .flowi4_iif = LOOPBACK_IFINDEX, | |
303 | .daddr = ip_hdr(skb)->saddr, | |
304 | .flowi4_tos = RT_TOS(ip_hdr(skb)->tos), | |
305 | .flowi4_scope = scope, | |
306 | .flowi4_mark = IN_DEV_SRC_VMARK(in_dev) ? skb->mark : 0, | |
307 | }; | |
0eeb075f | 308 | if (!fib_lookup(net, &fl4, &res, 0)) |
a207a4b2 DM |
309 | return FIB_RES_PREFSRC(net, res); |
310 | } else { | |
311 | scope = RT_SCOPE_LINK; | |
312 | } | |
313 | ||
314 | return inet_select_addr(dev, ip_hdr(skb)->saddr, scope); | |
35ebf65e DM |
315 | } |
316 | ||
1da177e4 | 317 | /* Given (packet source, input interface) and optional (dst, oif, tos): |
6a31d2a9 ED |
318 | * - (main) check, that source is valid i.e. not broadcast or our local |
319 | * address. | |
320 | * - figure out what "logical" interface this packet arrived | |
321 | * and calculate "specific destination" address. | |
322 | * - check, that packet arrived from expected physical interface. | |
ebc0ffae | 323 | * called with rcu_read_lock() |
1da177e4 | 324 | */ |
7a9bc9b8 DM |
325 | static int __fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst, |
326 | u8 tos, int oif, struct net_device *dev, | |
327 | int rpf, struct in_device *idev, u32 *itag) | |
1da177e4 | 328 | { |
5a847a6e DA |
329 | struct net *net = dev_net(dev); |
330 | struct flow_keys flkeys; | |
1dced6a8 | 331 | int ret, no_addr; |
1da177e4 | 332 | struct fib_result res; |
9e56e380 | 333 | struct flowi4 fl4; |
9e56e380 | 334 | bool dev_match; |
1da177e4 | 335 | |
9ade2286 | 336 | fl4.flowi4_oif = 0; |
385add90 | 337 | fl4.flowi4_iif = l3mdev_master_ifindex_rcu(dev); |
cd2fbe1b DA |
338 | if (!fl4.flowi4_iif) |
339 | fl4.flowi4_iif = oif ? : LOOPBACK_IFINDEX; | |
9ade2286 DM |
340 | fl4.daddr = src; |
341 | fl4.saddr = dst; | |
342 | fl4.flowi4_tos = tos; | |
343 | fl4.flowi4_scope = RT_SCOPE_UNIVERSE; | |
1b7179d3 | 344 | fl4.flowi4_tun_key.tun_id = 0; |
b84f7878 | 345 | fl4.flowi4_flags = 0; |
8bcfd092 | 346 | fl4.flowi4_uid = sock_net_uid(net, NULL); |
cc7e17ea | 347 | |
9e56e380 | 348 | no_addr = idev->ifa_list == NULL; |
990078af | 349 | |
9e56e380 | 350 | fl4.flowi4_mark = IN_DEV_SRC_VMARK(idev) ? skb->mark : 0; |
5a847a6e DA |
351 | if (!fib4_rules_early_flow_dissect(net, skb, &fl4, &flkeys)) { |
352 | fl4.flowi4_proto = 0; | |
353 | fl4.fl4_sport = 0; | |
354 | fl4.fl4_dport = 0; | |
355 | } | |
1da177e4 | 356 | |
f6d3c192 DA |
357 | trace_fib_validate_source(dev, &fl4); |
358 | ||
0eeb075f | 359 | if (fib_lookup(net, &fl4, &res, 0)) |
1da177e4 | 360 | goto last_resort; |
1dced6a8 SB |
361 | if (res.type != RTN_UNICAST && |
362 | (res.type != RTN_LOCAL || !IN_DEV_ACCEPT_LOCAL(idev))) | |
363 | goto e_inval; | |
1da177e4 | 364 | fib_combine_itag(itag, &res); |
6f86b325 DM |
365 | dev_match = false; |
366 | ||
1da177e4 | 367 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
6f86b325 DM |
368 | for (ret = 0; ret < res.fi->fib_nhs; ret++) { |
369 | struct fib_nh *nh = &res.fi->fib_nh[ret]; | |
370 | ||
371 | if (nh->nh_dev == dev) { | |
372 | dev_match = true; | |
373 | break; | |
385add90 | 374 | } else if (l3mdev_master_ifindex_rcu(nh->nh_dev) == dev->ifindex) { |
cd2fbe1b DA |
375 | dev_match = true; |
376 | break; | |
6f86b325 DM |
377 | } |
378 | } | |
1da177e4 LT |
379 | #else |
380 | if (FIB_RES_DEV(res) == dev) | |
6f86b325 | 381 | dev_match = true; |
1da177e4 | 382 | #endif |
6f86b325 | 383 | if (dev_match) { |
1da177e4 | 384 | ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST; |
1da177e4 LT |
385 | return ret; |
386 | } | |
1da177e4 LT |
387 | if (no_addr) |
388 | goto last_resort; | |
c1cf8422 | 389 | if (rpf == 1) |
b5f7e755 | 390 | goto e_rpf; |
9ade2286 | 391 | fl4.flowi4_oif = dev->ifindex; |
1da177e4 LT |
392 | |
393 | ret = 0; | |
0eeb075f | 394 | if (fib_lookup(net, &fl4, &res, FIB_LOOKUP_IGNORE_LINKSTATE) == 0) { |
41347dcd | 395 | if (res.type == RTN_UNICAST) |
1da177e4 | 396 | ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST; |
1da177e4 LT |
397 | } |
398 | return ret; | |
399 | ||
400 | last_resort: | |
401 | if (rpf) | |
b5f7e755 | 402 | goto e_rpf; |
1da177e4 LT |
403 | *itag = 0; |
404 | return 0; | |
405 | ||
1da177e4 LT |
406 | e_inval: |
407 | return -EINVAL; | |
b5f7e755 ED |
408 | e_rpf: |
409 | return -EXDEV; | |
1da177e4 LT |
410 | } |
411 | ||
7a9bc9b8 DM |
412 | /* Ignore rp_filter for packets protected by IPsec. */ |
413 | int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst, | |
414 | u8 tos, int oif, struct net_device *dev, | |
415 | struct in_device *idev, u32 *itag) | |
416 | { | |
417 | int r = secpath_exists(skb) ? 0 : IN_DEV_RPFILTER(idev); | |
6e617de8 | 418 | struct net *net = dev_net(dev); |
7a9bc9b8 | 419 | |
6e617de8 | 420 | if (!r && !fib_num_tclassid_users(net) && |
e81da0e1 | 421 | (dev->ifindex != oif || !IN_DEV_TX_REDIRECTS(idev))) { |
6e617de8 PA |
422 | if (IN_DEV_ACCEPT_LOCAL(idev)) |
423 | goto ok; | |
032a4802 PA |
424 | /* with custom local routes in place, checking local addresses |
425 | * only will be too optimistic, with custom rules, checking | |
426 | * local addresses only can be too strict, e.g. due to vrf | |
6e617de8 | 427 | */ |
032a4802 PA |
428 | if (net->ipv4.fib_has_custom_local_routes || |
429 | fib4_has_custom_rules(net)) | |
6e617de8 PA |
430 | goto full_check; |
431 | if (inet_lookup_ifaddr_rcu(net, src)) | |
432 | return -EINVAL; | |
433 | ||
434 | ok: | |
7a9bc9b8 DM |
435 | *itag = 0; |
436 | return 0; | |
437 | } | |
6e617de8 PA |
438 | |
439 | full_check: | |
7a9bc9b8 DM |
440 | return __fib_validate_source(skb, src, dst, tos, oif, dev, r, idev, itag); |
441 | } | |
442 | ||
81f7bf6c | 443 | static inline __be32 sk_extract_addr(struct sockaddr *addr) |
4e902c57 TG |
444 | { |
445 | return ((struct sockaddr_in *) addr)->sin_addr.s_addr; | |
446 | } | |
447 | ||
448 | static int put_rtax(struct nlattr *mx, int len, int type, u32 value) | |
449 | { | |
450 | struct nlattr *nla; | |
451 | ||
452 | nla = (struct nlattr *) ((char *) mx + len); | |
453 | nla->nla_type = type; | |
454 | nla->nla_len = nla_attr_size(4); | |
455 | *(u32 *) nla_data(nla) = value; | |
456 | ||
457 | return len + nla_total_size(4); | |
458 | } | |
459 | ||
4b5d47d4 | 460 | static int rtentry_to_fib_config(struct net *net, int cmd, struct rtentry *rt, |
4e902c57 TG |
461 | struct fib_config *cfg) |
462 | { | |
6d85c10a | 463 | __be32 addr; |
4e902c57 TG |
464 | int plen; |
465 | ||
466 | memset(cfg, 0, sizeof(*cfg)); | |
4b5d47d4 | 467 | cfg->fc_nlinfo.nl_net = net; |
4e902c57 TG |
468 | |
469 | if (rt->rt_dst.sa_family != AF_INET) | |
470 | return -EAFNOSUPPORT; | |
471 | ||
472 | /* | |
473 | * Check mask for validity: | |
474 | * a) it must be contiguous. | |
475 | * b) destination must have all host bits clear. | |
476 | * c) if application forgot to set correct family (AF_INET), | |
477 | * reject request unless it is absolutely clear i.e. | |
478 | * both family and mask are zero. | |
479 | */ | |
480 | plen = 32; | |
481 | addr = sk_extract_addr(&rt->rt_dst); | |
482 | if (!(rt->rt_flags & RTF_HOST)) { | |
81f7bf6c | 483 | __be32 mask = sk_extract_addr(&rt->rt_genmask); |
4e902c57 TG |
484 | |
485 | if (rt->rt_genmask.sa_family != AF_INET) { | |
486 | if (mask || rt->rt_genmask.sa_family) | |
487 | return -EAFNOSUPPORT; | |
488 | } | |
489 | ||
490 | if (bad_mask(mask, addr)) | |
491 | return -EINVAL; | |
492 | ||
493 | plen = inet_mask_len(mask); | |
494 | } | |
495 | ||
496 | cfg->fc_dst_len = plen; | |
497 | cfg->fc_dst = addr; | |
498 | ||
499 | if (cmd != SIOCDELRT) { | |
500 | cfg->fc_nlflags = NLM_F_CREATE; | |
501 | cfg->fc_protocol = RTPROT_BOOT; | |
502 | } | |
503 | ||
504 | if (rt->rt_metric) | |
505 | cfg->fc_priority = rt->rt_metric - 1; | |
506 | ||
507 | if (rt->rt_flags & RTF_REJECT) { | |
508 | cfg->fc_scope = RT_SCOPE_HOST; | |
509 | cfg->fc_type = RTN_UNREACHABLE; | |
510 | return 0; | |
511 | } | |
512 | ||
513 | cfg->fc_scope = RT_SCOPE_NOWHERE; | |
514 | cfg->fc_type = RTN_UNICAST; | |
515 | ||
516 | if (rt->rt_dev) { | |
517 | char *colon; | |
518 | struct net_device *dev; | |
519 | char devname[IFNAMSIZ]; | |
520 | ||
521 | if (copy_from_user(devname, rt->rt_dev, IFNAMSIZ-1)) | |
522 | return -EFAULT; | |
523 | ||
524 | devname[IFNAMSIZ-1] = 0; | |
525 | colon = strchr(devname, ':'); | |
526 | if (colon) | |
527 | *colon = 0; | |
4b5d47d4 | 528 | dev = __dev_get_by_name(net, devname); |
4e902c57 TG |
529 | if (!dev) |
530 | return -ENODEV; | |
531 | cfg->fc_oif = dev->ifindex; | |
5a56a0b3 | 532 | cfg->fc_table = l3mdev_fib_table(dev); |
4e902c57 TG |
533 | if (colon) { |
534 | struct in_ifaddr *ifa; | |
535 | struct in_device *in_dev = __in_dev_get_rtnl(dev); | |
536 | if (!in_dev) | |
537 | return -ENODEV; | |
538 | *colon = ':'; | |
539 | for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) | |
540 | if (strcmp(ifa->ifa_label, devname) == 0) | |
541 | break; | |
51456b29 | 542 | if (!ifa) |
4e902c57 TG |
543 | return -ENODEV; |
544 | cfg->fc_prefsrc = ifa->ifa_local; | |
545 | } | |
546 | } | |
547 | ||
548 | addr = sk_extract_addr(&rt->rt_gateway); | |
549 | if (rt->rt_gateway.sa_family == AF_INET && addr) { | |
30bbaa19 DA |
550 | unsigned int addr_type; |
551 | ||
4e902c57 | 552 | cfg->fc_gw = addr; |
30bbaa19 | 553 | addr_type = inet_addr_type_table(net, addr, cfg->fc_table); |
4e902c57 | 554 | if (rt->rt_flags & RTF_GATEWAY && |
30bbaa19 | 555 | addr_type == RTN_UNICAST) |
4e902c57 TG |
556 | cfg->fc_scope = RT_SCOPE_UNIVERSE; |
557 | } | |
558 | ||
559 | if (cmd == SIOCDELRT) | |
560 | return 0; | |
561 | ||
562 | if (rt->rt_flags & RTF_GATEWAY && !cfg->fc_gw) | |
563 | return -EINVAL; | |
564 | ||
565 | if (cfg->fc_scope == RT_SCOPE_NOWHERE) | |
566 | cfg->fc_scope = RT_SCOPE_LINK; | |
567 | ||
568 | if (rt->rt_flags & (RTF_MTU | RTF_WINDOW | RTF_IRTT)) { | |
569 | struct nlattr *mx; | |
570 | int len = 0; | |
571 | ||
572 | mx = kzalloc(3 * nla_total_size(4), GFP_KERNEL); | |
51456b29 | 573 | if (!mx) |
4e902c57 TG |
574 | return -ENOMEM; |
575 | ||
576 | if (rt->rt_flags & RTF_MTU) | |
577 | len = put_rtax(mx, len, RTAX_ADVMSS, rt->rt_mtu - 40); | |
578 | ||
579 | if (rt->rt_flags & RTF_WINDOW) | |
580 | len = put_rtax(mx, len, RTAX_WINDOW, rt->rt_window); | |
581 | ||
582 | if (rt->rt_flags & RTF_IRTT) | |
583 | len = put_rtax(mx, len, RTAX_RTT, rt->rt_irtt << 3); | |
584 | ||
585 | cfg->fc_mx = mx; | |
586 | cfg->fc_mx_len = len; | |
587 | } | |
588 | ||
589 | return 0; | |
590 | } | |
591 | ||
1da177e4 | 592 | /* |
6a31d2a9 ED |
593 | * Handle IP routing ioctl calls. |
594 | * These are used to manipulate the routing tables | |
1da177e4 | 595 | */ |
ca25c300 | 596 | int ip_rt_ioctl(struct net *net, unsigned int cmd, struct rtentry *rt) |
1da177e4 | 597 | { |
4e902c57 | 598 | struct fib_config cfg; |
1da177e4 | 599 | int err; |
1da177e4 LT |
600 | |
601 | switch (cmd) { | |
602 | case SIOCADDRT: /* Add a route */ | |
603 | case SIOCDELRT: /* Delete a route */ | |
52e804c6 | 604 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 | 605 | return -EPERM; |
4e902c57 | 606 | |
1da177e4 | 607 | rtnl_lock(); |
ca25c300 | 608 | err = rtentry_to_fib_config(net, cmd, rt, &cfg); |
1da177e4 | 609 | if (err == 0) { |
4e902c57 TG |
610 | struct fib_table *tb; |
611 | ||
1da177e4 | 612 | if (cmd == SIOCDELRT) { |
1bad118a | 613 | tb = fib_get_table(net, cfg.fc_table); |
1da177e4 | 614 | if (tb) |
78055998 DA |
615 | err = fib_table_delete(net, tb, &cfg, |
616 | NULL); | |
4e902c57 TG |
617 | else |
618 | err = -ESRCH; | |
1da177e4 | 619 | } else { |
1bad118a | 620 | tb = fib_new_table(net, cfg.fc_table); |
1da177e4 | 621 | if (tb) |
6d8422a1 DA |
622 | err = fib_table_insert(net, tb, |
623 | &cfg, NULL); | |
4e902c57 TG |
624 | else |
625 | err = -ENOBUFS; | |
1da177e4 | 626 | } |
4e902c57 TG |
627 | |
628 | /* allocated by rtentry_to_fib_config() */ | |
629 | kfree(cfg.fc_mx); | |
1da177e4 LT |
630 | } |
631 | rtnl_unlock(); | |
632 | return err; | |
633 | } | |
634 | return -EINVAL; | |
635 | } | |
636 | ||
6a31d2a9 | 637 | const struct nla_policy rtm_ipv4_policy[RTA_MAX + 1] = { |
4e902c57 TG |
638 | [RTA_DST] = { .type = NLA_U32 }, |
639 | [RTA_SRC] = { .type = NLA_U32 }, | |
640 | [RTA_IIF] = { .type = NLA_U32 }, | |
641 | [RTA_OIF] = { .type = NLA_U32 }, | |
642 | [RTA_GATEWAY] = { .type = NLA_U32 }, | |
643 | [RTA_PRIORITY] = { .type = NLA_U32 }, | |
644 | [RTA_PREFSRC] = { .type = NLA_U32 }, | |
645 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
5176f91e | 646 | [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) }, |
4e902c57 | 647 | [RTA_FLOW] = { .type = NLA_U32 }, |
571e7226 RP |
648 | [RTA_ENCAP_TYPE] = { .type = NLA_U16 }, |
649 | [RTA_ENCAP] = { .type = NLA_NESTED }, | |
622ec2c9 | 650 | [RTA_UID] = { .type = NLA_U32 }, |
3b45a410 | 651 | [RTA_MARK] = { .type = NLA_U32 }, |
4e902c57 TG |
652 | }; |
653 | ||
4b5d47d4 | 654 | static int rtm_to_fib_config(struct net *net, struct sk_buff *skb, |
6d8422a1 DA |
655 | struct nlmsghdr *nlh, struct fib_config *cfg, |
656 | struct netlink_ext_ack *extack) | |
1da177e4 | 657 | { |
4e902c57 TG |
658 | struct nlattr *attr; |
659 | int err, remaining; | |
660 | struct rtmsg *rtm; | |
661 | ||
fceb6435 | 662 | err = nlmsg_validate(nlh, sizeof(*rtm), RTA_MAX, rtm_ipv4_policy, |
6d8422a1 | 663 | extack); |
4e902c57 TG |
664 | if (err < 0) |
665 | goto errout; | |
666 | ||
667 | memset(cfg, 0, sizeof(*cfg)); | |
668 | ||
669 | rtm = nlmsg_data(nlh); | |
4e902c57 | 670 | cfg->fc_dst_len = rtm->rtm_dst_len; |
4e902c57 TG |
671 | cfg->fc_tos = rtm->rtm_tos; |
672 | cfg->fc_table = rtm->rtm_table; | |
673 | cfg->fc_protocol = rtm->rtm_protocol; | |
674 | cfg->fc_scope = rtm->rtm_scope; | |
675 | cfg->fc_type = rtm->rtm_type; | |
676 | cfg->fc_flags = rtm->rtm_flags; | |
677 | cfg->fc_nlflags = nlh->nlmsg_flags; | |
678 | ||
15e47304 | 679 | cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid; |
4e902c57 | 680 | cfg->fc_nlinfo.nlh = nlh; |
4b5d47d4 | 681 | cfg->fc_nlinfo.nl_net = net; |
4e902c57 | 682 | |
a0ee18b9 | 683 | if (cfg->fc_type > RTN_MAX) { |
c3ab2b4e | 684 | NL_SET_ERR_MSG(extack, "Invalid route type"); |
a0ee18b9 TG |
685 | err = -EINVAL; |
686 | goto errout; | |
687 | } | |
688 | ||
4e902c57 | 689 | nlmsg_for_each_attr(attr, nlh, sizeof(struct rtmsg), remaining) { |
8f4c1f9b | 690 | switch (nla_type(attr)) { |
4e902c57 | 691 | case RTA_DST: |
17fb2c64 | 692 | cfg->fc_dst = nla_get_be32(attr); |
4e902c57 | 693 | break; |
4e902c57 TG |
694 | case RTA_OIF: |
695 | cfg->fc_oif = nla_get_u32(attr); | |
696 | break; | |
697 | case RTA_GATEWAY: | |
17fb2c64 | 698 | cfg->fc_gw = nla_get_be32(attr); |
4e902c57 TG |
699 | break; |
700 | case RTA_PRIORITY: | |
701 | cfg->fc_priority = nla_get_u32(attr); | |
702 | break; | |
703 | case RTA_PREFSRC: | |
17fb2c64 | 704 | cfg->fc_prefsrc = nla_get_be32(attr); |
4e902c57 TG |
705 | break; |
706 | case RTA_METRICS: | |
707 | cfg->fc_mx = nla_data(attr); | |
708 | cfg->fc_mx_len = nla_len(attr); | |
709 | break; | |
710 | case RTA_MULTIPATH: | |
9ed59592 | 711 | err = lwtunnel_valid_encap_type_attr(nla_data(attr), |
c255bd68 DA |
712 | nla_len(attr), |
713 | extack); | |
9ed59592 DA |
714 | if (err < 0) |
715 | goto errout; | |
4e902c57 TG |
716 | cfg->fc_mp = nla_data(attr); |
717 | cfg->fc_mp_len = nla_len(attr); | |
718 | break; | |
719 | case RTA_FLOW: | |
720 | cfg->fc_flow = nla_get_u32(attr); | |
721 | break; | |
4e902c57 TG |
722 | case RTA_TABLE: |
723 | cfg->fc_table = nla_get_u32(attr); | |
724 | break; | |
571e7226 RP |
725 | case RTA_ENCAP: |
726 | cfg->fc_encap = attr; | |
727 | break; | |
728 | case RTA_ENCAP_TYPE: | |
729 | cfg->fc_encap_type = nla_get_u16(attr); | |
c255bd68 DA |
730 | err = lwtunnel_valid_encap_type(cfg->fc_encap_type, |
731 | extack); | |
9ed59592 DA |
732 | if (err < 0) |
733 | goto errout; | |
571e7226 | 734 | break; |
1da177e4 LT |
735 | } |
736 | } | |
4e902c57 | 737 | |
1da177e4 | 738 | return 0; |
4e902c57 TG |
739 | errout: |
740 | return err; | |
1da177e4 LT |
741 | } |
742 | ||
c21ef3e3 DA |
743 | static int inet_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, |
744 | struct netlink_ext_ack *extack) | |
1da177e4 | 745 | { |
3b1e0a65 | 746 | struct net *net = sock_net(skb->sk); |
4e902c57 TG |
747 | struct fib_config cfg; |
748 | struct fib_table *tb; | |
749 | int err; | |
1da177e4 | 750 | |
6d8422a1 | 751 | err = rtm_to_fib_config(net, skb, nlh, &cfg, extack); |
4e902c57 TG |
752 | if (err < 0) |
753 | goto errout; | |
1da177e4 | 754 | |
8ad4942c | 755 | tb = fib_get_table(net, cfg.fc_table); |
51456b29 | 756 | if (!tb) { |
c3ab2b4e | 757 | NL_SET_ERR_MSG(extack, "FIB table does not exist"); |
4e902c57 TG |
758 | err = -ESRCH; |
759 | goto errout; | |
760 | } | |
761 | ||
78055998 | 762 | err = fib_table_delete(net, tb, &cfg, extack); |
4e902c57 TG |
763 | errout: |
764 | return err; | |
1da177e4 LT |
765 | } |
766 | ||
c21ef3e3 DA |
767 | static int inet_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, |
768 | struct netlink_ext_ack *extack) | |
1da177e4 | 769 | { |
3b1e0a65 | 770 | struct net *net = sock_net(skb->sk); |
4e902c57 TG |
771 | struct fib_config cfg; |
772 | struct fib_table *tb; | |
773 | int err; | |
1da177e4 | 774 | |
6d8422a1 | 775 | err = rtm_to_fib_config(net, skb, nlh, &cfg, extack); |
4e902c57 TG |
776 | if (err < 0) |
777 | goto errout; | |
1da177e4 | 778 | |
226b0b4a | 779 | tb = fib_new_table(net, cfg.fc_table); |
51456b29 | 780 | if (!tb) { |
4e902c57 TG |
781 | err = -ENOBUFS; |
782 | goto errout; | |
783 | } | |
784 | ||
6d8422a1 | 785 | err = fib_table_insert(net, tb, &cfg, extack); |
6e617de8 PA |
786 | if (!err && cfg.fc_type == RTN_LOCAL) |
787 | net->ipv4.fib_has_custom_local_routes = true; | |
4e902c57 TG |
788 | errout: |
789 | return err; | |
1da177e4 LT |
790 | } |
791 | ||
63f3444f | 792 | static int inet_dump_fib(struct sk_buff *skb, struct netlink_callback *cb) |
1da177e4 | 793 | { |
3b1e0a65 | 794 | struct net *net = sock_net(skb->sk); |
1af5a8c4 PM |
795 | unsigned int h, s_h; |
796 | unsigned int e = 0, s_e; | |
1da177e4 | 797 | struct fib_table *tb; |
e4aef8ae | 798 | struct hlist_head *head; |
f6c5775f | 799 | int dumped = 0, err; |
1da177e4 | 800 | |
be403ea1 TG |
801 | if (nlmsg_len(cb->nlh) >= sizeof(struct rtmsg) && |
802 | ((struct rtmsg *) nlmsg_data(cb->nlh))->rtm_flags & RTM_F_CLONED) | |
0b8c7f6f | 803 | return skb->len; |
1da177e4 | 804 | |
1af5a8c4 PM |
805 | s_h = cb->args[0]; |
806 | s_e = cb->args[1]; | |
807 | ||
a7e53531 AD |
808 | rcu_read_lock(); |
809 | ||
1af5a8c4 PM |
810 | for (h = s_h; h < FIB_TABLE_HASHSZ; h++, s_e = 0) { |
811 | e = 0; | |
e4aef8ae | 812 | head = &net->ipv4.fib_table_hash[h]; |
a7e53531 | 813 | hlist_for_each_entry_rcu(tb, head, tb_hlist) { |
1af5a8c4 PM |
814 | if (e < s_e) |
815 | goto next; | |
816 | if (dumped) | |
817 | memset(&cb->args[2], 0, sizeof(cb->args) - | |
e905a9ed | 818 | 2 * sizeof(cb->args[0])); |
f6c5775f DA |
819 | err = fib_table_dump(tb, skb, cb); |
820 | if (err < 0) { | |
821 | if (likely(skb->len)) | |
822 | goto out; | |
823 | ||
824 | goto out_err; | |
825 | } | |
1af5a8c4 PM |
826 | dumped = 1; |
827 | next: | |
828 | e++; | |
829 | } | |
1da177e4 | 830 | } |
1af5a8c4 | 831 | out: |
f6c5775f DA |
832 | err = skb->len; |
833 | out_err: | |
a7e53531 AD |
834 | rcu_read_unlock(); |
835 | ||
1af5a8c4 PM |
836 | cb->args[1] = e; |
837 | cb->args[0] = h; | |
1da177e4 | 838 | |
f6c5775f | 839 | return err; |
1da177e4 LT |
840 | } |
841 | ||
842 | /* Prepare and feed intra-kernel routing request. | |
6a31d2a9 ED |
843 | * Really, it should be netlink message, but :-( netlink |
844 | * can be not configured, so that we feed it directly | |
845 | * to fib engine. It is legal, because all events occur | |
846 | * only when netlink is already locked. | |
1da177e4 | 847 | */ |
81f7bf6c | 848 | static void fib_magic(int cmd, int type, __be32 dst, int dst_len, struct in_ifaddr *ifa) |
1da177e4 | 849 | { |
c346dca1 | 850 | struct net *net = dev_net(ifa->ifa_dev->dev); |
3236b004 | 851 | u32 tb_id = l3mdev_fib_table(ifa->ifa_dev->dev); |
4e902c57 TG |
852 | struct fib_table *tb; |
853 | struct fib_config cfg = { | |
854 | .fc_protocol = RTPROT_KERNEL, | |
855 | .fc_type = type, | |
856 | .fc_dst = dst, | |
857 | .fc_dst_len = dst_len, | |
858 | .fc_prefsrc = ifa->ifa_local, | |
859 | .fc_oif = ifa->ifa_dev->dev->ifindex, | |
860 | .fc_nlflags = NLM_F_CREATE | NLM_F_APPEND, | |
4d1169c1 | 861 | .fc_nlinfo = { |
4b5d47d4 | 862 | .nl_net = net, |
4d1169c1 | 863 | }, |
4e902c57 | 864 | }; |
1da177e4 | 865 | |
021dd3b8 DA |
866 | if (!tb_id) |
867 | tb_id = (type == RTN_UNICAST) ? RT_TABLE_MAIN : RT_TABLE_LOCAL; | |
1da177e4 | 868 | |
021dd3b8 | 869 | tb = fib_new_table(net, tb_id); |
51456b29 | 870 | if (!tb) |
1da177e4 LT |
871 | return; |
872 | ||
4e902c57 | 873 | cfg.fc_table = tb->tb_id; |
1da177e4 | 874 | |
4e902c57 TG |
875 | if (type != RTN_LOCAL) |
876 | cfg.fc_scope = RT_SCOPE_LINK; | |
877 | else | |
878 | cfg.fc_scope = RT_SCOPE_HOST; | |
1da177e4 LT |
879 | |
880 | if (cmd == RTM_NEWROUTE) | |
6d8422a1 | 881 | fib_table_insert(net, tb, &cfg, NULL); |
1da177e4 | 882 | else |
78055998 | 883 | fib_table_delete(net, tb, &cfg, NULL); |
1da177e4 LT |
884 | } |
885 | ||
0ff60a45 | 886 | void fib_add_ifaddr(struct in_ifaddr *ifa) |
1da177e4 LT |
887 | { |
888 | struct in_device *in_dev = ifa->ifa_dev; | |
889 | struct net_device *dev = in_dev->dev; | |
890 | struct in_ifaddr *prim = ifa; | |
a144ea4b AV |
891 | __be32 mask = ifa->ifa_mask; |
892 | __be32 addr = ifa->ifa_local; | |
6a31d2a9 | 893 | __be32 prefix = ifa->ifa_address & mask; |
1da177e4 | 894 | |
6a31d2a9 | 895 | if (ifa->ifa_flags & IFA_F_SECONDARY) { |
1da177e4 | 896 | prim = inet_ifa_byprefix(in_dev, prefix, mask); |
51456b29 | 897 | if (!prim) { |
058bd4d2 | 898 | pr_warn("%s: bug: prim == NULL\n", __func__); |
1da177e4 LT |
899 | return; |
900 | } | |
901 | } | |
902 | ||
903 | fib_magic(RTM_NEWROUTE, RTN_LOCAL, addr, 32, prim); | |
904 | ||
6a31d2a9 | 905 | if (!(dev->flags & IFF_UP)) |
1da177e4 LT |
906 | return; |
907 | ||
908 | /* Add broadcast address, if it is explicitly assigned. */ | |
a144ea4b | 909 | if (ifa->ifa_broadcast && ifa->ifa_broadcast != htonl(0xFFFFFFFF)) |
1da177e4 LT |
910 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim); |
911 | ||
6a31d2a9 | 912 | if (!ipv4_is_zeronet(prefix) && !(ifa->ifa_flags & IFA_F_SECONDARY) && |
1da177e4 | 913 | (prefix != addr || ifa->ifa_prefixlen < 32)) { |
7b131180 PA |
914 | if (!(ifa->ifa_flags & IFA_F_NOPREFIXROUTE)) |
915 | fib_magic(RTM_NEWROUTE, | |
916 | dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST, | |
917 | prefix, ifa->ifa_prefixlen, prim); | |
1da177e4 LT |
918 | |
919 | /* Add network specific broadcasts, when it takes a sense */ | |
920 | if (ifa->ifa_prefixlen < 31) { | |
921 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix, 32, prim); | |
6a31d2a9 ED |
922 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix | ~mask, |
923 | 32, prim); | |
1da177e4 LT |
924 | } |
925 | } | |
926 | } | |
927 | ||
e6abbaa2 JA |
928 | /* Delete primary or secondary address. |
929 | * Optionally, on secondary address promotion consider the addresses | |
930 | * from subnet iprim as deleted, even if they are in device list. | |
931 | * In this case the secondary ifa can be in device list. | |
932 | */ | |
933 | void fib_del_ifaddr(struct in_ifaddr *ifa, struct in_ifaddr *iprim) | |
1da177e4 LT |
934 | { |
935 | struct in_device *in_dev = ifa->ifa_dev; | |
936 | struct net_device *dev = in_dev->dev; | |
937 | struct in_ifaddr *ifa1; | |
e6abbaa2 | 938 | struct in_ifaddr *prim = ifa, *prim1 = NULL; |
6a31d2a9 ED |
939 | __be32 brd = ifa->ifa_address | ~ifa->ifa_mask; |
940 | __be32 any = ifa->ifa_address & ifa->ifa_mask; | |
1da177e4 LT |
941 | #define LOCAL_OK 1 |
942 | #define BRD_OK 2 | |
943 | #define BRD0_OK 4 | |
944 | #define BRD1_OK 8 | |
95c96174 | 945 | unsigned int ok = 0; |
e6abbaa2 JA |
946 | int subnet = 0; /* Primary network */ |
947 | int gone = 1; /* Address is missing */ | |
948 | int same_prefsrc = 0; /* Another primary with same IP */ | |
1da177e4 | 949 | |
e6abbaa2 | 950 | if (ifa->ifa_flags & IFA_F_SECONDARY) { |
1da177e4 | 951 | prim = inet_ifa_byprefix(in_dev, any, ifa->ifa_mask); |
51456b29 | 952 | if (!prim) { |
391a2033 PA |
953 | /* if the device has been deleted, we don't perform |
954 | * address promotion | |
955 | */ | |
956 | if (!in_dev->dead) | |
957 | pr_warn("%s: bug: prim == NULL\n", __func__); | |
1da177e4 LT |
958 | return; |
959 | } | |
e6abbaa2 | 960 | if (iprim && iprim != prim) { |
058bd4d2 | 961 | pr_warn("%s: bug: iprim != prim\n", __func__); |
e6abbaa2 JA |
962 | return; |
963 | } | |
964 | } else if (!ipv4_is_zeronet(any) && | |
965 | (any != ifa->ifa_local || ifa->ifa_prefixlen < 32)) { | |
7b131180 PA |
966 | if (!(ifa->ifa_flags & IFA_F_NOPREFIXROUTE)) |
967 | fib_magic(RTM_DELROUTE, | |
968 | dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST, | |
969 | any, ifa->ifa_prefixlen, prim); | |
e6abbaa2 | 970 | subnet = 1; |
1da177e4 LT |
971 | } |
972 | ||
fbd40ea0 DM |
973 | if (in_dev->dead) |
974 | goto no_promotions; | |
975 | ||
1da177e4 | 976 | /* Deletion is more complicated than add. |
6a31d2a9 ED |
977 | * We should take care of not to delete too much :-) |
978 | * | |
979 | * Scan address list to be sure that addresses are really gone. | |
1da177e4 LT |
980 | */ |
981 | ||
982 | for (ifa1 = in_dev->ifa_list; ifa1; ifa1 = ifa1->ifa_next) { | |
e6abbaa2 JA |
983 | if (ifa1 == ifa) { |
984 | /* promotion, keep the IP */ | |
985 | gone = 0; | |
986 | continue; | |
987 | } | |
988 | /* Ignore IFAs from our subnet */ | |
989 | if (iprim && ifa1->ifa_mask == iprim->ifa_mask && | |
990 | inet_ifa_match(ifa1->ifa_address, iprim)) | |
991 | continue; | |
992 | ||
993 | /* Ignore ifa1 if it uses different primary IP (prefsrc) */ | |
994 | if (ifa1->ifa_flags & IFA_F_SECONDARY) { | |
995 | /* Another address from our subnet? */ | |
996 | if (ifa1->ifa_mask == prim->ifa_mask && | |
997 | inet_ifa_match(ifa1->ifa_address, prim)) | |
998 | prim1 = prim; | |
999 | else { | |
1000 | /* We reached the secondaries, so | |
1001 | * same_prefsrc should be determined. | |
1002 | */ | |
1003 | if (!same_prefsrc) | |
1004 | continue; | |
1005 | /* Search new prim1 if ifa1 is not | |
1006 | * using the current prim1 | |
1007 | */ | |
1008 | if (!prim1 || | |
1009 | ifa1->ifa_mask != prim1->ifa_mask || | |
1010 | !inet_ifa_match(ifa1->ifa_address, prim1)) | |
1011 | prim1 = inet_ifa_byprefix(in_dev, | |
1012 | ifa1->ifa_address, | |
1013 | ifa1->ifa_mask); | |
1014 | if (!prim1) | |
1015 | continue; | |
1016 | if (prim1->ifa_local != prim->ifa_local) | |
1017 | continue; | |
1018 | } | |
1019 | } else { | |
1020 | if (prim->ifa_local != ifa1->ifa_local) | |
1021 | continue; | |
1022 | prim1 = ifa1; | |
1023 | if (prim != prim1) | |
1024 | same_prefsrc = 1; | |
1025 | } | |
1da177e4 LT |
1026 | if (ifa->ifa_local == ifa1->ifa_local) |
1027 | ok |= LOCAL_OK; | |
1028 | if (ifa->ifa_broadcast == ifa1->ifa_broadcast) | |
1029 | ok |= BRD_OK; | |
1030 | if (brd == ifa1->ifa_broadcast) | |
1031 | ok |= BRD1_OK; | |
1032 | if (any == ifa1->ifa_broadcast) | |
1033 | ok |= BRD0_OK; | |
e6abbaa2 JA |
1034 | /* primary has network specific broadcasts */ |
1035 | if (prim1 == ifa1 && ifa1->ifa_prefixlen < 31) { | |
1036 | __be32 brd1 = ifa1->ifa_address | ~ifa1->ifa_mask; | |
1037 | __be32 any1 = ifa1->ifa_address & ifa1->ifa_mask; | |
1038 | ||
1039 | if (!ipv4_is_zeronet(any1)) { | |
1040 | if (ifa->ifa_broadcast == brd1 || | |
1041 | ifa->ifa_broadcast == any1) | |
1042 | ok |= BRD_OK; | |
1043 | if (brd == brd1 || brd == any1) | |
1044 | ok |= BRD1_OK; | |
1045 | if (any == brd1 || any == any1) | |
1046 | ok |= BRD0_OK; | |
1047 | } | |
1048 | } | |
1da177e4 LT |
1049 | } |
1050 | ||
fbd40ea0 | 1051 | no_promotions: |
6a31d2a9 | 1052 | if (!(ok & BRD_OK)) |
1da177e4 | 1053 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim); |
e6abbaa2 JA |
1054 | if (subnet && ifa->ifa_prefixlen < 31) { |
1055 | if (!(ok & BRD1_OK)) | |
1056 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, brd, 32, prim); | |
1057 | if (!(ok & BRD0_OK)) | |
1058 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, any, 32, prim); | |
1059 | } | |
6a31d2a9 | 1060 | if (!(ok & LOCAL_OK)) { |
30bbaa19 DA |
1061 | unsigned int addr_type; |
1062 | ||
1da177e4 LT |
1063 | fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 32, prim); |
1064 | ||
1065 | /* Check, that this local address finally disappeared. */ | |
30bbaa19 DA |
1066 | addr_type = inet_addr_type_dev_table(dev_net(dev), dev, |
1067 | ifa->ifa_local); | |
1068 | if (gone && addr_type != RTN_LOCAL) { | |
1da177e4 | 1069 | /* And the last, but not the least thing. |
6a31d2a9 ED |
1070 | * We must flush stray FIB entries. |
1071 | * | |
1072 | * First of all, we scan fib_info list searching | |
1073 | * for stray nexthop entries, then ignite fib_flush. | |
1074 | */ | |
5a56a0b3 | 1075 | if (fib_sync_down_addr(dev, ifa->ifa_local)) |
c346dca1 | 1076 | fib_flush(dev_net(dev)); |
1da177e4 LT |
1077 | } |
1078 | } | |
1079 | #undef LOCAL_OK | |
1080 | #undef BRD_OK | |
1081 | #undef BRD0_OK | |
1082 | #undef BRD1_OK | |
1083 | } | |
1084 | ||
345e9b54 | 1085 | static void nl_fib_lookup(struct net *net, struct fib_result_nl *frn) |
246955fe | 1086 | { |
e905a9ed | 1087 | |
246955fe | 1088 | struct fib_result res; |
9ade2286 DM |
1089 | struct flowi4 fl4 = { |
1090 | .flowi4_mark = frn->fl_mark, | |
1091 | .daddr = frn->fl_addr, | |
1092 | .flowi4_tos = frn->fl_tos, | |
1093 | .flowi4_scope = frn->fl_scope, | |
6a31d2a9 | 1094 | }; |
345e9b54 AD |
1095 | struct fib_table *tb; |
1096 | ||
1097 | rcu_read_lock(); | |
1098 | ||
1099 | tb = fib_get_table(net, frn->tb_id_in); | |
1194ed0a AK |
1100 | |
1101 | frn->err = -ENOENT; | |
246955fe RO |
1102 | if (tb) { |
1103 | local_bh_disable(); | |
1104 | ||
1105 | frn->tb_id = tb->tb_id; | |
9ade2286 | 1106 | frn->err = fib_table_lookup(tb, &fl4, &res, FIB_LOOKUP_NOREF); |
246955fe RO |
1107 | |
1108 | if (!frn->err) { | |
1109 | frn->prefixlen = res.prefixlen; | |
1110 | frn->nh_sel = res.nh_sel; | |
1111 | frn->type = res.type; | |
1112 | frn->scope = res.scope; | |
1113 | } | |
1114 | local_bh_enable(); | |
1115 | } | |
345e9b54 AD |
1116 | |
1117 | rcu_read_unlock(); | |
246955fe RO |
1118 | } |
1119 | ||
28f7b036 | 1120 | static void nl_fib_input(struct sk_buff *skb) |
246955fe | 1121 | { |
6bd48fcf | 1122 | struct net *net; |
246955fe | 1123 | struct fib_result_nl *frn; |
28f7b036 | 1124 | struct nlmsghdr *nlh; |
15e47304 | 1125 | u32 portid; |
1194ed0a | 1126 | |
3b1e0a65 | 1127 | net = sock_net(skb->sk); |
b529ccf2 | 1128 | nlh = nlmsg_hdr(skb); |
c64c0b3c ED |
1129 | if (skb->len < nlmsg_total_size(sizeof(*frn)) || |
1130 | skb->len < nlh->nlmsg_len || | |
573ce260 | 1131 | nlmsg_len(nlh) < sizeof(*frn)) |
ea86575e | 1132 | return; |
d883a036 | 1133 | |
3a36515f | 1134 | skb = netlink_skb_clone(skb, GFP_KERNEL); |
51456b29 | 1135 | if (!skb) |
d883a036 DL |
1136 | return; |
1137 | nlh = nlmsg_hdr(skb); | |
e905a9ed | 1138 | |
573ce260 | 1139 | frn = (struct fib_result_nl *) nlmsg_data(nlh); |
345e9b54 | 1140 | nl_fib_lookup(net, frn); |
e905a9ed | 1141 | |
28a28283 | 1142 | portid = NETLINK_CB(skb).portid; /* netlink portid */ |
15e47304 | 1143 | NETLINK_CB(skb).portid = 0; /* from kernel */ |
ac6d439d | 1144 | NETLINK_CB(skb).dst_group = 0; /* unicast */ |
15e47304 | 1145 | netlink_unicast(net->ipv4.fibnl, skb, portid, MSG_DONTWAIT); |
e905a9ed | 1146 | } |
246955fe | 1147 | |
2c8c1e72 | 1148 | static int __net_init nl_fib_lookup_init(struct net *net) |
246955fe | 1149 | { |
6bd48fcf | 1150 | struct sock *sk; |
a31f2d17 PNA |
1151 | struct netlink_kernel_cfg cfg = { |
1152 | .input = nl_fib_input, | |
1153 | }; | |
1154 | ||
9f00d977 | 1155 | sk = netlink_kernel_create(net, NETLINK_FIB_LOOKUP, &cfg); |
51456b29 | 1156 | if (!sk) |
7b1a74fd | 1157 | return -EAFNOSUPPORT; |
6bd48fcf | 1158 | net->ipv4.fibnl = sk; |
7b1a74fd DL |
1159 | return 0; |
1160 | } | |
1161 | ||
1162 | static void nl_fib_lookup_exit(struct net *net) | |
1163 | { | |
b7c6ba6e | 1164 | netlink_kernel_release(net->ipv4.fibnl); |
775516bf | 1165 | net->ipv4.fibnl = NULL; |
246955fe RO |
1166 | } |
1167 | ||
4f823def JA |
1168 | static void fib_disable_ip(struct net_device *dev, unsigned long event, |
1169 | bool force) | |
1da177e4 | 1170 | { |
4f823def | 1171 | if (fib_sync_down_dev(dev, event, force)) |
c346dca1 | 1172 | fib_flush(dev_net(dev)); |
06b4fc52 GF |
1173 | else |
1174 | rt_cache_flush(dev_net(dev)); | |
1da177e4 LT |
1175 | arp_ifdown(dev); |
1176 | } | |
1177 | ||
1178 | static int fib_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1179 | { | |
6ed2533e | 1180 | struct in_ifaddr *ifa = (struct in_ifaddr *)ptr; |
76e6ebfb | 1181 | struct net_device *dev = ifa->ifa_dev->dev; |
436c3b66 | 1182 | struct net *net = dev_net(dev); |
1da177e4 LT |
1183 | |
1184 | switch (event) { | |
1185 | case NETDEV_UP: | |
1186 | fib_add_ifaddr(ifa); | |
1187 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
8a3d0316 | 1188 | fib_sync_up(dev, RTNH_F_DEAD); |
1da177e4 | 1189 | #endif |
436c3b66 | 1190 | atomic_inc(&net->ipv4.dev_addr_genid); |
4ccfe6d4 | 1191 | rt_cache_flush(dev_net(dev)); |
1da177e4 LT |
1192 | break; |
1193 | case NETDEV_DOWN: | |
e6abbaa2 | 1194 | fib_del_ifaddr(ifa, NULL); |
436c3b66 | 1195 | atomic_inc(&net->ipv4.dev_addr_genid); |
51456b29 | 1196 | if (!ifa->ifa_dev->ifa_list) { |
1da177e4 | 1197 | /* Last address was deleted from this interface. |
6a31d2a9 | 1198 | * Disable IP. |
1da177e4 | 1199 | */ |
4f823def | 1200 | fib_disable_ip(dev, event, true); |
1da177e4 | 1201 | } else { |
4ccfe6d4 | 1202 | rt_cache_flush(dev_net(dev)); |
1da177e4 LT |
1203 | } |
1204 | break; | |
1205 | } | |
1206 | return NOTIFY_DONE; | |
1207 | } | |
1208 | ||
1209 | static int fib_netdev_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1210 | { | |
351638e7 | 1211 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
7f49e7a3 | 1212 | struct netdev_notifier_changeupper_info *info; |
0115e8e3 | 1213 | struct in_device *in_dev; |
436c3b66 | 1214 | struct net *net = dev_net(dev); |
8a3d0316 | 1215 | unsigned int flags; |
1da177e4 LT |
1216 | |
1217 | if (event == NETDEV_UNREGISTER) { | |
4f823def | 1218 | fib_disable_ip(dev, event, true); |
caacf05e | 1219 | rt_flush_dev(dev); |
1da177e4 LT |
1220 | return NOTIFY_DONE; |
1221 | } | |
1222 | ||
0115e8e3 | 1223 | in_dev = __in_dev_get_rtnl(dev); |
a0065f26 OH |
1224 | if (!in_dev) |
1225 | return NOTIFY_DONE; | |
0115e8e3 | 1226 | |
1da177e4 LT |
1227 | switch (event) { |
1228 | case NETDEV_UP: | |
1229 | for_ifa(in_dev) { | |
1230 | fib_add_ifaddr(ifa); | |
1231 | } endfor_ifa(in_dev); | |
1232 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
8a3d0316 | 1233 | fib_sync_up(dev, RTNH_F_DEAD); |
1da177e4 | 1234 | #endif |
436c3b66 | 1235 | atomic_inc(&net->ipv4.dev_addr_genid); |
4ccfe6d4 | 1236 | rt_cache_flush(net); |
1da177e4 LT |
1237 | break; |
1238 | case NETDEV_DOWN: | |
4f823def | 1239 | fib_disable_ip(dev, event, false); |
1da177e4 | 1240 | break; |
1da177e4 | 1241 | case NETDEV_CHANGE: |
8a3d0316 AG |
1242 | flags = dev_get_flags(dev); |
1243 | if (flags & (IFF_RUNNING | IFF_LOWER_UP)) | |
1244 | fib_sync_up(dev, RTNH_F_LINKDOWN); | |
1245 | else | |
4f823def | 1246 | fib_sync_down_dev(dev, event, false); |
8a3d0316 AG |
1247 | /* fall through */ |
1248 | case NETDEV_CHANGEMTU: | |
4ccfe6d4 | 1249 | rt_cache_flush(net); |
1da177e4 | 1250 | break; |
7f49e7a3 DA |
1251 | case NETDEV_CHANGEUPPER: |
1252 | info = ptr; | |
1253 | /* flush all routes if dev is linked to or unlinked from | |
1254 | * an L3 master device (e.g., VRF) | |
1255 | */ | |
1256 | if (info->upper_dev && netif_is_l3_master(info->upper_dev)) | |
1257 | fib_disable_ip(dev, NETDEV_DOWN, true); | |
1258 | break; | |
1da177e4 LT |
1259 | } |
1260 | return NOTIFY_DONE; | |
1261 | } | |
1262 | ||
1263 | static struct notifier_block fib_inetaddr_notifier = { | |
6ed2533e | 1264 | .notifier_call = fib_inetaddr_event, |
1da177e4 LT |
1265 | }; |
1266 | ||
1267 | static struct notifier_block fib_netdev_notifier = { | |
6ed2533e | 1268 | .notifier_call = fib_netdev_event, |
1da177e4 LT |
1269 | }; |
1270 | ||
7b1a74fd | 1271 | static int __net_init ip_fib_net_init(struct net *net) |
1da177e4 | 1272 | { |
dce5cbee | 1273 | int err; |
10da66f7 ED |
1274 | size_t size = sizeof(struct hlist_head) * FIB_TABLE_HASHSZ; |
1275 | ||
04b1d4e5 IS |
1276 | err = fib4_notifier_init(net); |
1277 | if (err) | |
1278 | return err; | |
cacaad11 | 1279 | |
10da66f7 ED |
1280 | /* Avoid false sharing : Use at least a full cache line */ |
1281 | size = max_t(size_t, size, L1_CACHE_BYTES); | |
1af5a8c4 | 1282 | |
10da66f7 | 1283 | net->ipv4.fib_table_hash = kzalloc(size, GFP_KERNEL); |
04b1d4e5 IS |
1284 | if (!net->ipv4.fib_table_hash) { |
1285 | err = -ENOMEM; | |
1286 | goto err_table_hash_alloc; | |
1287 | } | |
e4aef8ae | 1288 | |
dce5cbee DL |
1289 | err = fib4_rules_init(net); |
1290 | if (err < 0) | |
04b1d4e5 | 1291 | goto err_rules_init; |
dce5cbee DL |
1292 | return 0; |
1293 | ||
04b1d4e5 | 1294 | err_rules_init: |
dce5cbee | 1295 | kfree(net->ipv4.fib_table_hash); |
04b1d4e5 IS |
1296 | err_table_hash_alloc: |
1297 | fib4_notifier_exit(net); | |
dce5cbee | 1298 | return err; |
7b1a74fd | 1299 | } |
1da177e4 | 1300 | |
2c8c1e72 | 1301 | static void ip_fib_net_exit(struct net *net) |
7b1a74fd | 1302 | { |
b4681c28 | 1303 | int i; |
7b1a74fd | 1304 | |
6dede75b | 1305 | rtnl_lock(); |
6e47d6ca | 1306 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
6e47d6ca AD |
1307 | RCU_INIT_POINTER(net->ipv4.fib_main, NULL); |
1308 | RCU_INIT_POINTER(net->ipv4.fib_default, NULL); | |
1309 | #endif | |
b4681c28 IS |
1310 | /* Destroy the tables in reverse order to guarantee that the |
1311 | * local table, ID 255, is destroyed before the main table, ID | |
1312 | * 254. This is necessary as the local table may contain | |
1313 | * references to data contained in the main table. | |
1314 | */ | |
1315 | for (i = FIB_TABLE_HASHSZ - 1; i >= 0; i--) { | |
a7e53531 | 1316 | struct hlist_head *head = &net->ipv4.fib_table_hash[i]; |
b67bfe0d | 1317 | struct hlist_node *tmp; |
a7e53531 AD |
1318 | struct fib_table *tb; |
1319 | ||
b67bfe0d SL |
1320 | hlist_for_each_entry_safe(tb, tmp, head, tb_hlist) { |
1321 | hlist_del(&tb->tb_hlist); | |
b90eb754 | 1322 | fib_table_flush(net, tb); |
4aa2c466 | 1323 | fib_free_table(tb); |
7b1a74fd DL |
1324 | } |
1325 | } | |
ad88d051 AD |
1326 | |
1327 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
1328 | fib4_rules_exit(net); | |
1329 | #endif | |
e2666f84 | 1330 | rtnl_unlock(); |
e4aef8ae | 1331 | kfree(net->ipv4.fib_table_hash); |
04b1d4e5 | 1332 | fib4_notifier_exit(net); |
7b1a74fd DL |
1333 | } |
1334 | ||
1335 | static int __net_init fib_net_init(struct net *net) | |
1336 | { | |
1337 | int error; | |
1338 | ||
f4530fa5 DM |
1339 | #ifdef CONFIG_IP_ROUTE_CLASSID |
1340 | net->ipv4.fib_num_tclassid_users = 0; | |
1341 | #endif | |
7b1a74fd DL |
1342 | error = ip_fib_net_init(net); |
1343 | if (error < 0) | |
1344 | goto out; | |
1345 | error = nl_fib_lookup_init(net); | |
1346 | if (error < 0) | |
1347 | goto out_nlfl; | |
1348 | error = fib_proc_init(net); | |
1349 | if (error < 0) | |
1350 | goto out_proc; | |
1351 | out: | |
1352 | return error; | |
1353 | ||
1354 | out_proc: | |
1355 | nl_fib_lookup_exit(net); | |
1356 | out_nlfl: | |
1357 | ip_fib_net_exit(net); | |
1358 | goto out; | |
1359 | } | |
1360 | ||
1361 | static void __net_exit fib_net_exit(struct net *net) | |
1362 | { | |
1363 | fib_proc_exit(net); | |
1364 | nl_fib_lookup_exit(net); | |
1365 | ip_fib_net_exit(net); | |
1366 | } | |
1367 | ||
1368 | static struct pernet_operations fib_net_ops = { | |
1369 | .init = fib_net_init, | |
1370 | .exit = fib_net_exit, | |
1371 | }; | |
1372 | ||
1373 | void __init ip_fib_init(void) | |
1374 | { | |
8799a221 | 1375 | fib_trie_init(); |
7b1a74fd DL |
1376 | |
1377 | register_pernet_subsys(&fib_net_ops); | |
8799a221 | 1378 | |
7b1a74fd DL |
1379 | register_netdevice_notifier(&fib_netdev_notifier); |
1380 | register_inetaddr_notifier(&fib_inetaddr_notifier); | |
7f9b8052 | 1381 | |
b97bac64 FW |
1382 | rtnl_register(PF_INET, RTM_NEWROUTE, inet_rtm_newroute, NULL, 0); |
1383 | rtnl_register(PF_INET, RTM_DELROUTE, inet_rtm_delroute, NULL, 0); | |
1384 | rtnl_register(PF_INET, RTM_GETROUTE, NULL, inet_dump_fib, 0); | |
1da177e4 | 1385 | } |