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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) | |
f97f4dd8 | 206 | flushed += fib_table_flush(net, tb, false); |
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); | |
35ebf65e DM |
295 | |
296 | net = dev_net(dev); | |
a207a4b2 DM |
297 | |
298 | scope = RT_SCOPE_UNIVERSE; | |
299 | if (!ipv4_is_zeronet(ip_hdr(skb)->saddr)) { | |
9fc12023 | 300 | bool vmark = in_dev && IN_DEV_SRC_VMARK(in_dev); |
4cfc86f3 LR |
301 | struct flowi4 fl4 = { |
302 | .flowi4_iif = LOOPBACK_IFINDEX, | |
e7372197 | 303 | .flowi4_oif = l3mdev_master_ifindex_rcu(dev), |
4cfc86f3 LR |
304 | .daddr = ip_hdr(skb)->saddr, |
305 | .flowi4_tos = RT_TOS(ip_hdr(skb)->tos), | |
306 | .flowi4_scope = scope, | |
9fc12023 | 307 | .flowi4_mark = vmark ? skb->mark : 0, |
4cfc86f3 | 308 | }; |
0eeb075f | 309 | if (!fib_lookup(net, &fl4, &res, 0)) |
a207a4b2 DM |
310 | return FIB_RES_PREFSRC(net, res); |
311 | } else { | |
312 | scope = RT_SCOPE_LINK; | |
313 | } | |
314 | ||
315 | return inet_select_addr(dev, ip_hdr(skb)->saddr, scope); | |
35ebf65e DM |
316 | } |
317 | ||
78f2756c DA |
318 | bool fib_info_nh_uses_dev(struct fib_info *fi, const struct net_device *dev) |
319 | { | |
320 | bool dev_match = false; | |
075e264f | 321 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
78f2756c DA |
322 | int ret; |
323 | ||
78f2756c DA |
324 | for (ret = 0; ret < fi->fib_nhs; ret++) { |
325 | struct fib_nh *nh = &fi->fib_nh[ret]; | |
326 | ||
327 | if (nh->nh_dev == dev) { | |
328 | dev_match = true; | |
329 | break; | |
330 | } else if (l3mdev_master_ifindex_rcu(nh->nh_dev) == dev->ifindex) { | |
331 | dev_match = true; | |
332 | break; | |
333 | } | |
334 | } | |
335 | #else | |
336 | if (fi->fib_nh[0].nh_dev == dev) | |
337 | dev_match = true; | |
338 | #endif | |
339 | ||
340 | return dev_match; | |
341 | } | |
342 | EXPORT_SYMBOL_GPL(fib_info_nh_uses_dev); | |
343 | ||
1da177e4 | 344 | /* Given (packet source, input interface) and optional (dst, oif, tos): |
6a31d2a9 ED |
345 | * - (main) check, that source is valid i.e. not broadcast or our local |
346 | * address. | |
347 | * - figure out what "logical" interface this packet arrived | |
348 | * and calculate "specific destination" address. | |
349 | * - check, that packet arrived from expected physical interface. | |
ebc0ffae | 350 | * called with rcu_read_lock() |
1da177e4 | 351 | */ |
7a9bc9b8 DM |
352 | static int __fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst, |
353 | u8 tos, int oif, struct net_device *dev, | |
354 | int rpf, struct in_device *idev, u32 *itag) | |
1da177e4 | 355 | { |
5a847a6e DA |
356 | struct net *net = dev_net(dev); |
357 | struct flow_keys flkeys; | |
1dced6a8 | 358 | int ret, no_addr; |
1da177e4 | 359 | struct fib_result res; |
9e56e380 | 360 | struct flowi4 fl4; |
9e56e380 | 361 | bool dev_match; |
1da177e4 | 362 | |
9ade2286 | 363 | fl4.flowi4_oif = 0; |
385add90 | 364 | fl4.flowi4_iif = l3mdev_master_ifindex_rcu(dev); |
cd2fbe1b DA |
365 | if (!fl4.flowi4_iif) |
366 | fl4.flowi4_iif = oif ? : LOOPBACK_IFINDEX; | |
9ade2286 DM |
367 | fl4.daddr = src; |
368 | fl4.saddr = dst; | |
369 | fl4.flowi4_tos = tos; | |
370 | fl4.flowi4_scope = RT_SCOPE_UNIVERSE; | |
1b7179d3 | 371 | fl4.flowi4_tun_key.tun_id = 0; |
b84f7878 | 372 | fl4.flowi4_flags = 0; |
8bcfd092 | 373 | fl4.flowi4_uid = sock_net_uid(net, NULL); |
cc7e17ea | 374 | |
9e56e380 | 375 | no_addr = idev->ifa_list == NULL; |
990078af | 376 | |
9e56e380 | 377 | fl4.flowi4_mark = IN_DEV_SRC_VMARK(idev) ? skb->mark : 0; |
5a847a6e DA |
378 | if (!fib4_rules_early_flow_dissect(net, skb, &fl4, &flkeys)) { |
379 | fl4.flowi4_proto = 0; | |
380 | fl4.fl4_sport = 0; | |
381 | fl4.fl4_dport = 0; | |
382 | } | |
1da177e4 | 383 | |
0eeb075f | 384 | if (fib_lookup(net, &fl4, &res, 0)) |
1da177e4 | 385 | goto last_resort; |
1dced6a8 SB |
386 | if (res.type != RTN_UNICAST && |
387 | (res.type != RTN_LOCAL || !IN_DEV_ACCEPT_LOCAL(idev))) | |
388 | goto e_inval; | |
1da177e4 | 389 | fib_combine_itag(itag, &res); |
6f86b325 | 390 | |
78f2756c | 391 | dev_match = fib_info_nh_uses_dev(res.fi, dev); |
6f86b325 | 392 | if (dev_match) { |
1da177e4 | 393 | ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST; |
1da177e4 LT |
394 | return ret; |
395 | } | |
1da177e4 LT |
396 | if (no_addr) |
397 | goto last_resort; | |
c1cf8422 | 398 | if (rpf == 1) |
b5f7e755 | 399 | goto e_rpf; |
9ade2286 | 400 | fl4.flowi4_oif = dev->ifindex; |
1da177e4 LT |
401 | |
402 | ret = 0; | |
0eeb075f | 403 | if (fib_lookup(net, &fl4, &res, FIB_LOOKUP_IGNORE_LINKSTATE) == 0) { |
41347dcd | 404 | if (res.type == RTN_UNICAST) |
1da177e4 | 405 | ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST; |
1da177e4 LT |
406 | } |
407 | return ret; | |
408 | ||
409 | last_resort: | |
410 | if (rpf) | |
b5f7e755 | 411 | goto e_rpf; |
1da177e4 LT |
412 | *itag = 0; |
413 | return 0; | |
414 | ||
1da177e4 LT |
415 | e_inval: |
416 | return -EINVAL; | |
b5f7e755 ED |
417 | e_rpf: |
418 | return -EXDEV; | |
1da177e4 LT |
419 | } |
420 | ||
7a9bc9b8 DM |
421 | /* Ignore rp_filter for packets protected by IPsec. */ |
422 | int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst, | |
423 | u8 tos, int oif, struct net_device *dev, | |
424 | struct in_device *idev, u32 *itag) | |
425 | { | |
426 | int r = secpath_exists(skb) ? 0 : IN_DEV_RPFILTER(idev); | |
6e617de8 | 427 | struct net *net = dev_net(dev); |
7a9bc9b8 | 428 | |
6e617de8 | 429 | if (!r && !fib_num_tclassid_users(net) && |
e81da0e1 | 430 | (dev->ifindex != oif || !IN_DEV_TX_REDIRECTS(idev))) { |
6e617de8 PA |
431 | if (IN_DEV_ACCEPT_LOCAL(idev)) |
432 | goto ok; | |
032a4802 PA |
433 | /* with custom local routes in place, checking local addresses |
434 | * only will be too optimistic, with custom rules, checking | |
435 | * local addresses only can be too strict, e.g. due to vrf | |
6e617de8 | 436 | */ |
032a4802 PA |
437 | if (net->ipv4.fib_has_custom_local_routes || |
438 | fib4_has_custom_rules(net)) | |
6e617de8 PA |
439 | goto full_check; |
440 | if (inet_lookup_ifaddr_rcu(net, src)) | |
441 | return -EINVAL; | |
442 | ||
443 | ok: | |
7a9bc9b8 DM |
444 | *itag = 0; |
445 | return 0; | |
446 | } | |
6e617de8 PA |
447 | |
448 | full_check: | |
7a9bc9b8 DM |
449 | return __fib_validate_source(skb, src, dst, tos, oif, dev, r, idev, itag); |
450 | } | |
451 | ||
81f7bf6c | 452 | static inline __be32 sk_extract_addr(struct sockaddr *addr) |
4e902c57 TG |
453 | { |
454 | return ((struct sockaddr_in *) addr)->sin_addr.s_addr; | |
455 | } | |
456 | ||
457 | static int put_rtax(struct nlattr *mx, int len, int type, u32 value) | |
458 | { | |
459 | struct nlattr *nla; | |
460 | ||
461 | nla = (struct nlattr *) ((char *) mx + len); | |
462 | nla->nla_type = type; | |
463 | nla->nla_len = nla_attr_size(4); | |
464 | *(u32 *) nla_data(nla) = value; | |
465 | ||
466 | return len + nla_total_size(4); | |
467 | } | |
468 | ||
4b5d47d4 | 469 | static int rtentry_to_fib_config(struct net *net, int cmd, struct rtentry *rt, |
4e902c57 TG |
470 | struct fib_config *cfg) |
471 | { | |
6d85c10a | 472 | __be32 addr; |
4e902c57 TG |
473 | int plen; |
474 | ||
475 | memset(cfg, 0, sizeof(*cfg)); | |
4b5d47d4 | 476 | cfg->fc_nlinfo.nl_net = net; |
4e902c57 TG |
477 | |
478 | if (rt->rt_dst.sa_family != AF_INET) | |
479 | return -EAFNOSUPPORT; | |
480 | ||
481 | /* | |
482 | * Check mask for validity: | |
483 | * a) it must be contiguous. | |
484 | * b) destination must have all host bits clear. | |
485 | * c) if application forgot to set correct family (AF_INET), | |
486 | * reject request unless it is absolutely clear i.e. | |
487 | * both family and mask are zero. | |
488 | */ | |
489 | plen = 32; | |
490 | addr = sk_extract_addr(&rt->rt_dst); | |
491 | if (!(rt->rt_flags & RTF_HOST)) { | |
81f7bf6c | 492 | __be32 mask = sk_extract_addr(&rt->rt_genmask); |
4e902c57 TG |
493 | |
494 | if (rt->rt_genmask.sa_family != AF_INET) { | |
495 | if (mask || rt->rt_genmask.sa_family) | |
496 | return -EAFNOSUPPORT; | |
497 | } | |
498 | ||
499 | if (bad_mask(mask, addr)) | |
500 | return -EINVAL; | |
501 | ||
502 | plen = inet_mask_len(mask); | |
503 | } | |
504 | ||
505 | cfg->fc_dst_len = plen; | |
506 | cfg->fc_dst = addr; | |
507 | ||
508 | if (cmd != SIOCDELRT) { | |
509 | cfg->fc_nlflags = NLM_F_CREATE; | |
510 | cfg->fc_protocol = RTPROT_BOOT; | |
511 | } | |
512 | ||
513 | if (rt->rt_metric) | |
514 | cfg->fc_priority = rt->rt_metric - 1; | |
515 | ||
516 | if (rt->rt_flags & RTF_REJECT) { | |
517 | cfg->fc_scope = RT_SCOPE_HOST; | |
518 | cfg->fc_type = RTN_UNREACHABLE; | |
519 | return 0; | |
520 | } | |
521 | ||
522 | cfg->fc_scope = RT_SCOPE_NOWHERE; | |
523 | cfg->fc_type = RTN_UNICAST; | |
524 | ||
525 | if (rt->rt_dev) { | |
526 | char *colon; | |
527 | struct net_device *dev; | |
528 | char devname[IFNAMSIZ]; | |
529 | ||
530 | if (copy_from_user(devname, rt->rt_dev, IFNAMSIZ-1)) | |
531 | return -EFAULT; | |
532 | ||
533 | devname[IFNAMSIZ-1] = 0; | |
534 | colon = strchr(devname, ':'); | |
535 | if (colon) | |
536 | *colon = 0; | |
4b5d47d4 | 537 | dev = __dev_get_by_name(net, devname); |
4e902c57 TG |
538 | if (!dev) |
539 | return -ENODEV; | |
540 | cfg->fc_oif = dev->ifindex; | |
5a56a0b3 | 541 | cfg->fc_table = l3mdev_fib_table(dev); |
4e902c57 TG |
542 | if (colon) { |
543 | struct in_ifaddr *ifa; | |
544 | struct in_device *in_dev = __in_dev_get_rtnl(dev); | |
545 | if (!in_dev) | |
546 | return -ENODEV; | |
547 | *colon = ':'; | |
548 | for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) | |
549 | if (strcmp(ifa->ifa_label, devname) == 0) | |
550 | break; | |
51456b29 | 551 | if (!ifa) |
4e902c57 TG |
552 | return -ENODEV; |
553 | cfg->fc_prefsrc = ifa->ifa_local; | |
554 | } | |
555 | } | |
556 | ||
557 | addr = sk_extract_addr(&rt->rt_gateway); | |
558 | if (rt->rt_gateway.sa_family == AF_INET && addr) { | |
30bbaa19 DA |
559 | unsigned int addr_type; |
560 | ||
4e902c57 | 561 | cfg->fc_gw = addr; |
30bbaa19 | 562 | addr_type = inet_addr_type_table(net, addr, cfg->fc_table); |
4e902c57 | 563 | if (rt->rt_flags & RTF_GATEWAY && |
30bbaa19 | 564 | addr_type == RTN_UNICAST) |
4e902c57 TG |
565 | cfg->fc_scope = RT_SCOPE_UNIVERSE; |
566 | } | |
567 | ||
568 | if (cmd == SIOCDELRT) | |
569 | return 0; | |
570 | ||
571 | if (rt->rt_flags & RTF_GATEWAY && !cfg->fc_gw) | |
572 | return -EINVAL; | |
573 | ||
574 | if (cfg->fc_scope == RT_SCOPE_NOWHERE) | |
575 | cfg->fc_scope = RT_SCOPE_LINK; | |
576 | ||
577 | if (rt->rt_flags & (RTF_MTU | RTF_WINDOW | RTF_IRTT)) { | |
578 | struct nlattr *mx; | |
579 | int len = 0; | |
580 | ||
6396bb22 | 581 | mx = kcalloc(3, nla_total_size(4), GFP_KERNEL); |
51456b29 | 582 | if (!mx) |
4e902c57 TG |
583 | return -ENOMEM; |
584 | ||
585 | if (rt->rt_flags & RTF_MTU) | |
586 | len = put_rtax(mx, len, RTAX_ADVMSS, rt->rt_mtu - 40); | |
587 | ||
588 | if (rt->rt_flags & RTF_WINDOW) | |
589 | len = put_rtax(mx, len, RTAX_WINDOW, rt->rt_window); | |
590 | ||
591 | if (rt->rt_flags & RTF_IRTT) | |
592 | len = put_rtax(mx, len, RTAX_RTT, rt->rt_irtt << 3); | |
593 | ||
594 | cfg->fc_mx = mx; | |
595 | cfg->fc_mx_len = len; | |
596 | } | |
597 | ||
598 | return 0; | |
599 | } | |
600 | ||
1da177e4 | 601 | /* |
6a31d2a9 ED |
602 | * Handle IP routing ioctl calls. |
603 | * These are used to manipulate the routing tables | |
1da177e4 | 604 | */ |
ca25c300 | 605 | int ip_rt_ioctl(struct net *net, unsigned int cmd, struct rtentry *rt) |
1da177e4 | 606 | { |
4e902c57 | 607 | struct fib_config cfg; |
1da177e4 | 608 | int err; |
1da177e4 LT |
609 | |
610 | switch (cmd) { | |
611 | case SIOCADDRT: /* Add a route */ | |
612 | case SIOCDELRT: /* Delete a route */ | |
52e804c6 | 613 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 | 614 | return -EPERM; |
4e902c57 | 615 | |
1da177e4 | 616 | rtnl_lock(); |
ca25c300 | 617 | err = rtentry_to_fib_config(net, cmd, rt, &cfg); |
1da177e4 | 618 | if (err == 0) { |
4e902c57 TG |
619 | struct fib_table *tb; |
620 | ||
1da177e4 | 621 | if (cmd == SIOCDELRT) { |
1bad118a | 622 | tb = fib_get_table(net, cfg.fc_table); |
1da177e4 | 623 | if (tb) |
78055998 DA |
624 | err = fib_table_delete(net, tb, &cfg, |
625 | NULL); | |
4e902c57 TG |
626 | else |
627 | err = -ESRCH; | |
1da177e4 | 628 | } else { |
1bad118a | 629 | tb = fib_new_table(net, cfg.fc_table); |
1da177e4 | 630 | if (tb) |
6d8422a1 DA |
631 | err = fib_table_insert(net, tb, |
632 | &cfg, NULL); | |
4e902c57 TG |
633 | else |
634 | err = -ENOBUFS; | |
1da177e4 | 635 | } |
4e902c57 TG |
636 | |
637 | /* allocated by rtentry_to_fib_config() */ | |
638 | kfree(cfg.fc_mx); | |
1da177e4 LT |
639 | } |
640 | rtnl_unlock(); | |
641 | return err; | |
642 | } | |
643 | return -EINVAL; | |
644 | } | |
645 | ||
6a31d2a9 | 646 | const struct nla_policy rtm_ipv4_policy[RTA_MAX + 1] = { |
4e902c57 TG |
647 | [RTA_DST] = { .type = NLA_U32 }, |
648 | [RTA_SRC] = { .type = NLA_U32 }, | |
649 | [RTA_IIF] = { .type = NLA_U32 }, | |
650 | [RTA_OIF] = { .type = NLA_U32 }, | |
651 | [RTA_GATEWAY] = { .type = NLA_U32 }, | |
652 | [RTA_PRIORITY] = { .type = NLA_U32 }, | |
653 | [RTA_PREFSRC] = { .type = NLA_U32 }, | |
654 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
5176f91e | 655 | [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) }, |
4e902c57 | 656 | [RTA_FLOW] = { .type = NLA_U32 }, |
571e7226 RP |
657 | [RTA_ENCAP_TYPE] = { .type = NLA_U16 }, |
658 | [RTA_ENCAP] = { .type = NLA_NESTED }, | |
622ec2c9 | 659 | [RTA_UID] = { .type = NLA_U32 }, |
3b45a410 | 660 | [RTA_MARK] = { .type = NLA_U32 }, |
2eabd764 | 661 | [RTA_TABLE] = { .type = NLA_U32 }, |
404eb77e RP |
662 | [RTA_IP_PROTO] = { .type = NLA_U8 }, |
663 | [RTA_SPORT] = { .type = NLA_U16 }, | |
664 | [RTA_DPORT] = { .type = NLA_U16 }, | |
4e902c57 TG |
665 | }; |
666 | ||
4b5d47d4 | 667 | static int rtm_to_fib_config(struct net *net, struct sk_buff *skb, |
6d8422a1 DA |
668 | struct nlmsghdr *nlh, struct fib_config *cfg, |
669 | struct netlink_ext_ack *extack) | |
1da177e4 | 670 | { |
4e902c57 TG |
671 | struct nlattr *attr; |
672 | int err, remaining; | |
673 | struct rtmsg *rtm; | |
674 | ||
fceb6435 | 675 | err = nlmsg_validate(nlh, sizeof(*rtm), RTA_MAX, rtm_ipv4_policy, |
6d8422a1 | 676 | extack); |
4e902c57 TG |
677 | if (err < 0) |
678 | goto errout; | |
679 | ||
680 | memset(cfg, 0, sizeof(*cfg)); | |
681 | ||
682 | rtm = nlmsg_data(nlh); | |
4e902c57 | 683 | cfg->fc_dst_len = rtm->rtm_dst_len; |
4e902c57 TG |
684 | cfg->fc_tos = rtm->rtm_tos; |
685 | cfg->fc_table = rtm->rtm_table; | |
686 | cfg->fc_protocol = rtm->rtm_protocol; | |
687 | cfg->fc_scope = rtm->rtm_scope; | |
688 | cfg->fc_type = rtm->rtm_type; | |
689 | cfg->fc_flags = rtm->rtm_flags; | |
690 | cfg->fc_nlflags = nlh->nlmsg_flags; | |
691 | ||
15e47304 | 692 | cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid; |
4e902c57 | 693 | cfg->fc_nlinfo.nlh = nlh; |
4b5d47d4 | 694 | cfg->fc_nlinfo.nl_net = net; |
4e902c57 | 695 | |
a0ee18b9 | 696 | if (cfg->fc_type > RTN_MAX) { |
c3ab2b4e | 697 | NL_SET_ERR_MSG(extack, "Invalid route type"); |
a0ee18b9 TG |
698 | err = -EINVAL; |
699 | goto errout; | |
700 | } | |
701 | ||
4e902c57 | 702 | nlmsg_for_each_attr(attr, nlh, sizeof(struct rtmsg), remaining) { |
8f4c1f9b | 703 | switch (nla_type(attr)) { |
4e902c57 | 704 | case RTA_DST: |
17fb2c64 | 705 | cfg->fc_dst = nla_get_be32(attr); |
4e902c57 | 706 | break; |
4e902c57 TG |
707 | case RTA_OIF: |
708 | cfg->fc_oif = nla_get_u32(attr); | |
709 | break; | |
710 | case RTA_GATEWAY: | |
17fb2c64 | 711 | cfg->fc_gw = nla_get_be32(attr); |
4e902c57 TG |
712 | break; |
713 | case RTA_PRIORITY: | |
714 | cfg->fc_priority = nla_get_u32(attr); | |
715 | break; | |
716 | case RTA_PREFSRC: | |
17fb2c64 | 717 | cfg->fc_prefsrc = nla_get_be32(attr); |
4e902c57 TG |
718 | break; |
719 | case RTA_METRICS: | |
720 | cfg->fc_mx = nla_data(attr); | |
721 | cfg->fc_mx_len = nla_len(attr); | |
722 | break; | |
723 | case RTA_MULTIPATH: | |
9ed59592 | 724 | err = lwtunnel_valid_encap_type_attr(nla_data(attr), |
c255bd68 DA |
725 | nla_len(attr), |
726 | extack); | |
9ed59592 DA |
727 | if (err < 0) |
728 | goto errout; | |
4e902c57 TG |
729 | cfg->fc_mp = nla_data(attr); |
730 | cfg->fc_mp_len = nla_len(attr); | |
731 | break; | |
732 | case RTA_FLOW: | |
733 | cfg->fc_flow = nla_get_u32(attr); | |
734 | break; | |
4e902c57 TG |
735 | case RTA_TABLE: |
736 | cfg->fc_table = nla_get_u32(attr); | |
737 | break; | |
571e7226 RP |
738 | case RTA_ENCAP: |
739 | cfg->fc_encap = attr; | |
740 | break; | |
741 | case RTA_ENCAP_TYPE: | |
742 | cfg->fc_encap_type = nla_get_u16(attr); | |
c255bd68 DA |
743 | err = lwtunnel_valid_encap_type(cfg->fc_encap_type, |
744 | extack); | |
9ed59592 DA |
745 | if (err < 0) |
746 | goto errout; | |
571e7226 | 747 | break; |
1da177e4 LT |
748 | } |
749 | } | |
4e902c57 | 750 | |
1da177e4 | 751 | return 0; |
4e902c57 TG |
752 | errout: |
753 | return err; | |
1da177e4 LT |
754 | } |
755 | ||
c21ef3e3 DA |
756 | static int inet_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, |
757 | struct netlink_ext_ack *extack) | |
1da177e4 | 758 | { |
3b1e0a65 | 759 | struct net *net = sock_net(skb->sk); |
4e902c57 TG |
760 | struct fib_config cfg; |
761 | struct fib_table *tb; | |
762 | int err; | |
1da177e4 | 763 | |
6d8422a1 | 764 | err = rtm_to_fib_config(net, skb, nlh, &cfg, extack); |
4e902c57 TG |
765 | if (err < 0) |
766 | goto errout; | |
1da177e4 | 767 | |
8ad4942c | 768 | tb = fib_get_table(net, cfg.fc_table); |
51456b29 | 769 | if (!tb) { |
c3ab2b4e | 770 | NL_SET_ERR_MSG(extack, "FIB table does not exist"); |
4e902c57 TG |
771 | err = -ESRCH; |
772 | goto errout; | |
773 | } | |
774 | ||
78055998 | 775 | err = fib_table_delete(net, tb, &cfg, extack); |
4e902c57 TG |
776 | errout: |
777 | return err; | |
1da177e4 LT |
778 | } |
779 | ||
c21ef3e3 DA |
780 | static int inet_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, |
781 | struct netlink_ext_ack *extack) | |
1da177e4 | 782 | { |
3b1e0a65 | 783 | struct net *net = sock_net(skb->sk); |
4e902c57 TG |
784 | struct fib_config cfg; |
785 | struct fib_table *tb; | |
786 | int err; | |
1da177e4 | 787 | |
6d8422a1 | 788 | err = rtm_to_fib_config(net, skb, nlh, &cfg, extack); |
4e902c57 TG |
789 | if (err < 0) |
790 | goto errout; | |
1da177e4 | 791 | |
226b0b4a | 792 | tb = fib_new_table(net, cfg.fc_table); |
51456b29 | 793 | if (!tb) { |
4e902c57 TG |
794 | err = -ENOBUFS; |
795 | goto errout; | |
796 | } | |
797 | ||
6d8422a1 | 798 | err = fib_table_insert(net, tb, &cfg, extack); |
6e617de8 PA |
799 | if (!err && cfg.fc_type == RTN_LOCAL) |
800 | net->ipv4.fib_has_custom_local_routes = true; | |
4e902c57 TG |
801 | errout: |
802 | return err; | |
1da177e4 LT |
803 | } |
804 | ||
4724676d DA |
805 | int ip_valid_fib_dump_req(struct net *net, const struct nlmsghdr *nlh, |
806 | struct fib_dump_filter *filter, | |
effe6792 | 807 | struct netlink_callback *cb) |
e8ba330a | 808 | { |
effe6792 DA |
809 | struct netlink_ext_ack *extack = cb->extack; |
810 | struct nlattr *tb[RTA_MAX + 1]; | |
e8ba330a | 811 | struct rtmsg *rtm; |
effe6792 DA |
812 | int err, i; |
813 | ||
814 | ASSERT_RTNL(); | |
e8ba330a DA |
815 | |
816 | if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*rtm))) { | |
817 | NL_SET_ERR_MSG(extack, "Invalid header for FIB dump request"); | |
818 | return -EINVAL; | |
819 | } | |
820 | ||
821 | rtm = nlmsg_data(nlh); | |
822 | if (rtm->rtm_dst_len || rtm->rtm_src_len || rtm->rtm_tos || | |
effe6792 | 823 | rtm->rtm_scope) { |
e8ba330a DA |
824 | NL_SET_ERR_MSG(extack, "Invalid values in header for FIB dump request"); |
825 | return -EINVAL; | |
826 | } | |
827 | if (rtm->rtm_flags & ~(RTM_F_CLONED | RTM_F_PREFIX)) { | |
828 | NL_SET_ERR_MSG(extack, "Invalid flags for FIB dump request"); | |
829 | return -EINVAL; | |
830 | } | |
831 | ||
ae677bbb | 832 | filter->dump_all_families = (rtm->rtm_family == AF_UNSPEC); |
effe6792 DA |
833 | filter->flags = rtm->rtm_flags; |
834 | filter->protocol = rtm->rtm_protocol; | |
835 | filter->rt_type = rtm->rtm_type; | |
836 | filter->table_id = rtm->rtm_table; | |
837 | ||
838 | err = nlmsg_parse_strict(nlh, sizeof(*rtm), tb, RTA_MAX, | |
839 | rtm_ipv4_policy, extack); | |
840 | if (err < 0) | |
841 | return err; | |
842 | ||
843 | for (i = 0; i <= RTA_MAX; ++i) { | |
844 | int ifindex; | |
845 | ||
846 | if (!tb[i]) | |
847 | continue; | |
848 | ||
849 | switch (i) { | |
850 | case RTA_TABLE: | |
851 | filter->table_id = nla_get_u32(tb[i]); | |
852 | break; | |
853 | case RTA_OIF: | |
854 | ifindex = nla_get_u32(tb[i]); | |
855 | filter->dev = __dev_get_by_index(net, ifindex); | |
856 | if (!filter->dev) | |
857 | return -ENODEV; | |
858 | break; | |
859 | default: | |
860 | NL_SET_ERR_MSG(extack, "Unsupported attribute in dump request"); | |
861 | return -EINVAL; | |
862 | } | |
863 | } | |
864 | ||
865 | if (filter->flags || filter->protocol || filter->rt_type || | |
866 | filter->table_id || filter->dev) { | |
867 | filter->filter_set = 1; | |
868 | cb->answer_flags = NLM_F_DUMP_FILTERED; | |
e8ba330a DA |
869 | } |
870 | ||
871 | return 0; | |
872 | } | |
873 | EXPORT_SYMBOL_GPL(ip_valid_fib_dump_req); | |
874 | ||
63f3444f | 875 | static int inet_dump_fib(struct sk_buff *skb, struct netlink_callback *cb) |
1da177e4 | 876 | { |
e8ba330a | 877 | const struct nlmsghdr *nlh = cb->nlh; |
3b1e0a65 | 878 | struct net *net = sock_net(skb->sk); |
4724676d | 879 | struct fib_dump_filter filter = {}; |
1af5a8c4 PM |
880 | unsigned int h, s_h; |
881 | unsigned int e = 0, s_e; | |
1da177e4 | 882 | struct fib_table *tb; |
e4aef8ae | 883 | struct hlist_head *head; |
f6c5775f | 884 | int dumped = 0, err; |
1da177e4 | 885 | |
e8ba330a | 886 | if (cb->strict_check) { |
effe6792 | 887 | err = ip_valid_fib_dump_req(net, nlh, &filter, cb); |
e8ba330a DA |
888 | if (err < 0) |
889 | return err; | |
e4e92fb1 DA |
890 | } else if (nlmsg_len(nlh) >= sizeof(struct rtmsg)) { |
891 | struct rtmsg *rtm = nlmsg_data(nlh); | |
892 | ||
893 | filter.flags = rtm->rtm_flags & (RTM_F_PREFIX | RTM_F_CLONED); | |
e8ba330a DA |
894 | } |
895 | ||
e4e92fb1 DA |
896 | /* fib entries are never clones and ipv4 does not use prefix flag */ |
897 | if (filter.flags & (RTM_F_PREFIX | RTM_F_CLONED)) | |
0b8c7f6f | 898 | return skb->len; |
1da177e4 | 899 | |
18a8021a DA |
900 | if (filter.table_id) { |
901 | tb = fib_get_table(net, filter.table_id); | |
902 | if (!tb) { | |
ae677bbb DA |
903 | if (filter.dump_all_families) |
904 | return skb->len; | |
905 | ||
18a8021a DA |
906 | NL_SET_ERR_MSG(cb->extack, "ipv4: FIB table does not exist"); |
907 | return -ENOENT; | |
908 | } | |
909 | ||
910 | err = fib_table_dump(tb, skb, cb, &filter); | |
911 | return skb->len ? : err; | |
912 | } | |
913 | ||
1af5a8c4 PM |
914 | s_h = cb->args[0]; |
915 | s_e = cb->args[1]; | |
916 | ||
a7e53531 AD |
917 | rcu_read_lock(); |
918 | ||
1af5a8c4 PM |
919 | for (h = s_h; h < FIB_TABLE_HASHSZ; h++, s_e = 0) { |
920 | e = 0; | |
e4aef8ae | 921 | head = &net->ipv4.fib_table_hash[h]; |
a7e53531 | 922 | hlist_for_each_entry_rcu(tb, head, tb_hlist) { |
1af5a8c4 PM |
923 | if (e < s_e) |
924 | goto next; | |
925 | if (dumped) | |
926 | memset(&cb->args[2], 0, sizeof(cb->args) - | |
e905a9ed | 927 | 2 * sizeof(cb->args[0])); |
18a8021a | 928 | err = fib_table_dump(tb, skb, cb, &filter); |
f6c5775f DA |
929 | if (err < 0) { |
930 | if (likely(skb->len)) | |
931 | goto out; | |
932 | ||
933 | goto out_err; | |
934 | } | |
1af5a8c4 PM |
935 | dumped = 1; |
936 | next: | |
937 | e++; | |
938 | } | |
1da177e4 | 939 | } |
1af5a8c4 | 940 | out: |
f6c5775f DA |
941 | err = skb->len; |
942 | out_err: | |
a7e53531 AD |
943 | rcu_read_unlock(); |
944 | ||
1af5a8c4 PM |
945 | cb->args[1] = e; |
946 | cb->args[0] = h; | |
1da177e4 | 947 | |
f6c5775f | 948 | return err; |
1da177e4 LT |
949 | } |
950 | ||
951 | /* Prepare and feed intra-kernel routing request. | |
6a31d2a9 ED |
952 | * Really, it should be netlink message, but :-( netlink |
953 | * can be not configured, so that we feed it directly | |
954 | * to fib engine. It is legal, because all events occur | |
955 | * only when netlink is already locked. | |
1da177e4 | 956 | */ |
af4d768a DA |
957 | static void fib_magic(int cmd, int type, __be32 dst, int dst_len, |
958 | struct in_ifaddr *ifa, u32 rt_priority) | |
1da177e4 | 959 | { |
c346dca1 | 960 | struct net *net = dev_net(ifa->ifa_dev->dev); |
3236b004 | 961 | u32 tb_id = l3mdev_fib_table(ifa->ifa_dev->dev); |
4e902c57 TG |
962 | struct fib_table *tb; |
963 | struct fib_config cfg = { | |
964 | .fc_protocol = RTPROT_KERNEL, | |
965 | .fc_type = type, | |
966 | .fc_dst = dst, | |
967 | .fc_dst_len = dst_len, | |
af4d768a | 968 | .fc_priority = rt_priority, |
4e902c57 TG |
969 | .fc_prefsrc = ifa->ifa_local, |
970 | .fc_oif = ifa->ifa_dev->dev->ifindex, | |
971 | .fc_nlflags = NLM_F_CREATE | NLM_F_APPEND, | |
4d1169c1 | 972 | .fc_nlinfo = { |
4b5d47d4 | 973 | .nl_net = net, |
4d1169c1 | 974 | }, |
4e902c57 | 975 | }; |
1da177e4 | 976 | |
021dd3b8 DA |
977 | if (!tb_id) |
978 | tb_id = (type == RTN_UNICAST) ? RT_TABLE_MAIN : RT_TABLE_LOCAL; | |
1da177e4 | 979 | |
021dd3b8 | 980 | tb = fib_new_table(net, tb_id); |
51456b29 | 981 | if (!tb) |
1da177e4 LT |
982 | return; |
983 | ||
4e902c57 | 984 | cfg.fc_table = tb->tb_id; |
1da177e4 | 985 | |
4e902c57 TG |
986 | if (type != RTN_LOCAL) |
987 | cfg.fc_scope = RT_SCOPE_LINK; | |
988 | else | |
989 | cfg.fc_scope = RT_SCOPE_HOST; | |
1da177e4 LT |
990 | |
991 | if (cmd == RTM_NEWROUTE) | |
6d8422a1 | 992 | fib_table_insert(net, tb, &cfg, NULL); |
1da177e4 | 993 | else |
78055998 | 994 | fib_table_delete(net, tb, &cfg, NULL); |
1da177e4 LT |
995 | } |
996 | ||
0ff60a45 | 997 | void fib_add_ifaddr(struct in_ifaddr *ifa) |
1da177e4 LT |
998 | { |
999 | struct in_device *in_dev = ifa->ifa_dev; | |
1000 | struct net_device *dev = in_dev->dev; | |
1001 | struct in_ifaddr *prim = ifa; | |
a144ea4b AV |
1002 | __be32 mask = ifa->ifa_mask; |
1003 | __be32 addr = ifa->ifa_local; | |
6a31d2a9 | 1004 | __be32 prefix = ifa->ifa_address & mask; |
1da177e4 | 1005 | |
6a31d2a9 | 1006 | if (ifa->ifa_flags & IFA_F_SECONDARY) { |
1da177e4 | 1007 | prim = inet_ifa_byprefix(in_dev, prefix, mask); |
51456b29 | 1008 | if (!prim) { |
058bd4d2 | 1009 | pr_warn("%s: bug: prim == NULL\n", __func__); |
1da177e4 LT |
1010 | return; |
1011 | } | |
1012 | } | |
1013 | ||
af4d768a | 1014 | fib_magic(RTM_NEWROUTE, RTN_LOCAL, addr, 32, prim, 0); |
1da177e4 | 1015 | |
6a31d2a9 | 1016 | if (!(dev->flags & IFF_UP)) |
1da177e4 LT |
1017 | return; |
1018 | ||
1019 | /* Add broadcast address, if it is explicitly assigned. */ | |
a144ea4b | 1020 | if (ifa->ifa_broadcast && ifa->ifa_broadcast != htonl(0xFFFFFFFF)) |
af4d768a DA |
1021 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, |
1022 | prim, 0); | |
1da177e4 | 1023 | |
6a31d2a9 | 1024 | if (!ipv4_is_zeronet(prefix) && !(ifa->ifa_flags & IFA_F_SECONDARY) && |
1da177e4 | 1025 | (prefix != addr || ifa->ifa_prefixlen < 32)) { |
7b131180 PA |
1026 | if (!(ifa->ifa_flags & IFA_F_NOPREFIXROUTE)) |
1027 | fib_magic(RTM_NEWROUTE, | |
1028 | dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST, | |
af4d768a DA |
1029 | prefix, ifa->ifa_prefixlen, prim, |
1030 | ifa->ifa_rt_priority); | |
1da177e4 LT |
1031 | |
1032 | /* Add network specific broadcasts, when it takes a sense */ | |
1033 | if (ifa->ifa_prefixlen < 31) { | |
af4d768a DA |
1034 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix, 32, |
1035 | prim, 0); | |
6a31d2a9 | 1036 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix | ~mask, |
af4d768a | 1037 | 32, prim, 0); |
1da177e4 LT |
1038 | } |
1039 | } | |
1040 | } | |
1041 | ||
af4d768a DA |
1042 | void fib_modify_prefix_metric(struct in_ifaddr *ifa, u32 new_metric) |
1043 | { | |
1044 | __be32 prefix = ifa->ifa_address & ifa->ifa_mask; | |
1045 | struct in_device *in_dev = ifa->ifa_dev; | |
1046 | struct net_device *dev = in_dev->dev; | |
1047 | ||
1048 | if (!(dev->flags & IFF_UP) || | |
1049 | ifa->ifa_flags & (IFA_F_SECONDARY | IFA_F_NOPREFIXROUTE) || | |
1050 | ipv4_is_zeronet(prefix) || | |
1051 | prefix == ifa->ifa_local || ifa->ifa_prefixlen == 32) | |
1052 | return; | |
1053 | ||
1054 | /* add the new */ | |
1055 | fib_magic(RTM_NEWROUTE, | |
1056 | dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST, | |
1057 | prefix, ifa->ifa_prefixlen, ifa, new_metric); | |
1058 | ||
1059 | /* delete the old */ | |
1060 | fib_magic(RTM_DELROUTE, | |
1061 | dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST, | |
1062 | prefix, ifa->ifa_prefixlen, ifa, ifa->ifa_rt_priority); | |
1063 | } | |
1064 | ||
e6abbaa2 JA |
1065 | /* Delete primary or secondary address. |
1066 | * Optionally, on secondary address promotion consider the addresses | |
1067 | * from subnet iprim as deleted, even if they are in device list. | |
1068 | * In this case the secondary ifa can be in device list. | |
1069 | */ | |
1070 | void fib_del_ifaddr(struct in_ifaddr *ifa, struct in_ifaddr *iprim) | |
1da177e4 LT |
1071 | { |
1072 | struct in_device *in_dev = ifa->ifa_dev; | |
1073 | struct net_device *dev = in_dev->dev; | |
1074 | struct in_ifaddr *ifa1; | |
e6abbaa2 | 1075 | struct in_ifaddr *prim = ifa, *prim1 = NULL; |
6a31d2a9 ED |
1076 | __be32 brd = ifa->ifa_address | ~ifa->ifa_mask; |
1077 | __be32 any = ifa->ifa_address & ifa->ifa_mask; | |
1da177e4 LT |
1078 | #define LOCAL_OK 1 |
1079 | #define BRD_OK 2 | |
1080 | #define BRD0_OK 4 | |
1081 | #define BRD1_OK 8 | |
95c96174 | 1082 | unsigned int ok = 0; |
e6abbaa2 JA |
1083 | int subnet = 0; /* Primary network */ |
1084 | int gone = 1; /* Address is missing */ | |
1085 | int same_prefsrc = 0; /* Another primary with same IP */ | |
1da177e4 | 1086 | |
e6abbaa2 | 1087 | if (ifa->ifa_flags & IFA_F_SECONDARY) { |
1da177e4 | 1088 | prim = inet_ifa_byprefix(in_dev, any, ifa->ifa_mask); |
51456b29 | 1089 | if (!prim) { |
391a2033 PA |
1090 | /* if the device has been deleted, we don't perform |
1091 | * address promotion | |
1092 | */ | |
1093 | if (!in_dev->dead) | |
1094 | pr_warn("%s: bug: prim == NULL\n", __func__); | |
1da177e4 LT |
1095 | return; |
1096 | } | |
e6abbaa2 | 1097 | if (iprim && iprim != prim) { |
058bd4d2 | 1098 | pr_warn("%s: bug: iprim != prim\n", __func__); |
e6abbaa2 JA |
1099 | return; |
1100 | } | |
1101 | } else if (!ipv4_is_zeronet(any) && | |
1102 | (any != ifa->ifa_local || ifa->ifa_prefixlen < 32)) { | |
7b131180 PA |
1103 | if (!(ifa->ifa_flags & IFA_F_NOPREFIXROUTE)) |
1104 | fib_magic(RTM_DELROUTE, | |
1105 | dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST, | |
af4d768a | 1106 | any, ifa->ifa_prefixlen, prim, 0); |
e6abbaa2 | 1107 | subnet = 1; |
1da177e4 LT |
1108 | } |
1109 | ||
fbd40ea0 DM |
1110 | if (in_dev->dead) |
1111 | goto no_promotions; | |
1112 | ||
1da177e4 | 1113 | /* Deletion is more complicated than add. |
6a31d2a9 ED |
1114 | * We should take care of not to delete too much :-) |
1115 | * | |
1116 | * Scan address list to be sure that addresses are really gone. | |
1da177e4 LT |
1117 | */ |
1118 | ||
1119 | for (ifa1 = in_dev->ifa_list; ifa1; ifa1 = ifa1->ifa_next) { | |
e6abbaa2 JA |
1120 | if (ifa1 == ifa) { |
1121 | /* promotion, keep the IP */ | |
1122 | gone = 0; | |
1123 | continue; | |
1124 | } | |
1125 | /* Ignore IFAs from our subnet */ | |
1126 | if (iprim && ifa1->ifa_mask == iprim->ifa_mask && | |
1127 | inet_ifa_match(ifa1->ifa_address, iprim)) | |
1128 | continue; | |
1129 | ||
1130 | /* Ignore ifa1 if it uses different primary IP (prefsrc) */ | |
1131 | if (ifa1->ifa_flags & IFA_F_SECONDARY) { | |
1132 | /* Another address from our subnet? */ | |
1133 | if (ifa1->ifa_mask == prim->ifa_mask && | |
1134 | inet_ifa_match(ifa1->ifa_address, prim)) | |
1135 | prim1 = prim; | |
1136 | else { | |
1137 | /* We reached the secondaries, so | |
1138 | * same_prefsrc should be determined. | |
1139 | */ | |
1140 | if (!same_prefsrc) | |
1141 | continue; | |
1142 | /* Search new prim1 if ifa1 is not | |
1143 | * using the current prim1 | |
1144 | */ | |
1145 | if (!prim1 || | |
1146 | ifa1->ifa_mask != prim1->ifa_mask || | |
1147 | !inet_ifa_match(ifa1->ifa_address, prim1)) | |
1148 | prim1 = inet_ifa_byprefix(in_dev, | |
1149 | ifa1->ifa_address, | |
1150 | ifa1->ifa_mask); | |
1151 | if (!prim1) | |
1152 | continue; | |
1153 | if (prim1->ifa_local != prim->ifa_local) | |
1154 | continue; | |
1155 | } | |
1156 | } else { | |
1157 | if (prim->ifa_local != ifa1->ifa_local) | |
1158 | continue; | |
1159 | prim1 = ifa1; | |
1160 | if (prim != prim1) | |
1161 | same_prefsrc = 1; | |
1162 | } | |
1da177e4 LT |
1163 | if (ifa->ifa_local == ifa1->ifa_local) |
1164 | ok |= LOCAL_OK; | |
1165 | if (ifa->ifa_broadcast == ifa1->ifa_broadcast) | |
1166 | ok |= BRD_OK; | |
1167 | if (brd == ifa1->ifa_broadcast) | |
1168 | ok |= BRD1_OK; | |
1169 | if (any == ifa1->ifa_broadcast) | |
1170 | ok |= BRD0_OK; | |
e6abbaa2 JA |
1171 | /* primary has network specific broadcasts */ |
1172 | if (prim1 == ifa1 && ifa1->ifa_prefixlen < 31) { | |
1173 | __be32 brd1 = ifa1->ifa_address | ~ifa1->ifa_mask; | |
1174 | __be32 any1 = ifa1->ifa_address & ifa1->ifa_mask; | |
1175 | ||
1176 | if (!ipv4_is_zeronet(any1)) { | |
1177 | if (ifa->ifa_broadcast == brd1 || | |
1178 | ifa->ifa_broadcast == any1) | |
1179 | ok |= BRD_OK; | |
1180 | if (brd == brd1 || brd == any1) | |
1181 | ok |= BRD1_OK; | |
1182 | if (any == brd1 || any == any1) | |
1183 | ok |= BRD0_OK; | |
1184 | } | |
1185 | } | |
1da177e4 LT |
1186 | } |
1187 | ||
fbd40ea0 | 1188 | no_promotions: |
6a31d2a9 | 1189 | if (!(ok & BRD_OK)) |
af4d768a DA |
1190 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, |
1191 | prim, 0); | |
e6abbaa2 JA |
1192 | if (subnet && ifa->ifa_prefixlen < 31) { |
1193 | if (!(ok & BRD1_OK)) | |
af4d768a DA |
1194 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, brd, 32, |
1195 | prim, 0); | |
e6abbaa2 | 1196 | if (!(ok & BRD0_OK)) |
af4d768a DA |
1197 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, any, 32, |
1198 | prim, 0); | |
e6abbaa2 | 1199 | } |
6a31d2a9 | 1200 | if (!(ok & LOCAL_OK)) { |
30bbaa19 DA |
1201 | unsigned int addr_type; |
1202 | ||
af4d768a | 1203 | fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 32, prim, 0); |
1da177e4 LT |
1204 | |
1205 | /* Check, that this local address finally disappeared. */ | |
30bbaa19 DA |
1206 | addr_type = inet_addr_type_dev_table(dev_net(dev), dev, |
1207 | ifa->ifa_local); | |
1208 | if (gone && addr_type != RTN_LOCAL) { | |
1da177e4 | 1209 | /* And the last, but not the least thing. |
6a31d2a9 ED |
1210 | * We must flush stray FIB entries. |
1211 | * | |
1212 | * First of all, we scan fib_info list searching | |
1213 | * for stray nexthop entries, then ignite fib_flush. | |
1214 | */ | |
5a56a0b3 | 1215 | if (fib_sync_down_addr(dev, ifa->ifa_local)) |
c346dca1 | 1216 | fib_flush(dev_net(dev)); |
1da177e4 LT |
1217 | } |
1218 | } | |
1219 | #undef LOCAL_OK | |
1220 | #undef BRD_OK | |
1221 | #undef BRD0_OK | |
1222 | #undef BRD1_OK | |
1223 | } | |
1224 | ||
345e9b54 | 1225 | static void nl_fib_lookup(struct net *net, struct fib_result_nl *frn) |
246955fe | 1226 | { |
e905a9ed | 1227 | |
246955fe | 1228 | struct fib_result res; |
9ade2286 DM |
1229 | struct flowi4 fl4 = { |
1230 | .flowi4_mark = frn->fl_mark, | |
1231 | .daddr = frn->fl_addr, | |
1232 | .flowi4_tos = frn->fl_tos, | |
1233 | .flowi4_scope = frn->fl_scope, | |
6a31d2a9 | 1234 | }; |
345e9b54 AD |
1235 | struct fib_table *tb; |
1236 | ||
1237 | rcu_read_lock(); | |
1238 | ||
1239 | tb = fib_get_table(net, frn->tb_id_in); | |
1194ed0a AK |
1240 | |
1241 | frn->err = -ENOENT; | |
246955fe RO |
1242 | if (tb) { |
1243 | local_bh_disable(); | |
1244 | ||
1245 | frn->tb_id = tb->tb_id; | |
9ade2286 | 1246 | frn->err = fib_table_lookup(tb, &fl4, &res, FIB_LOOKUP_NOREF); |
246955fe RO |
1247 | |
1248 | if (!frn->err) { | |
1249 | frn->prefixlen = res.prefixlen; | |
1250 | frn->nh_sel = res.nh_sel; | |
1251 | frn->type = res.type; | |
1252 | frn->scope = res.scope; | |
1253 | } | |
1254 | local_bh_enable(); | |
1255 | } | |
345e9b54 AD |
1256 | |
1257 | rcu_read_unlock(); | |
246955fe RO |
1258 | } |
1259 | ||
28f7b036 | 1260 | static void nl_fib_input(struct sk_buff *skb) |
246955fe | 1261 | { |
6bd48fcf | 1262 | struct net *net; |
246955fe | 1263 | struct fib_result_nl *frn; |
28f7b036 | 1264 | struct nlmsghdr *nlh; |
15e47304 | 1265 | u32 portid; |
1194ed0a | 1266 | |
3b1e0a65 | 1267 | net = sock_net(skb->sk); |
b529ccf2 | 1268 | nlh = nlmsg_hdr(skb); |
c64c0b3c ED |
1269 | if (skb->len < nlmsg_total_size(sizeof(*frn)) || |
1270 | skb->len < nlh->nlmsg_len || | |
573ce260 | 1271 | nlmsg_len(nlh) < sizeof(*frn)) |
ea86575e | 1272 | return; |
d883a036 | 1273 | |
3a36515f | 1274 | skb = netlink_skb_clone(skb, GFP_KERNEL); |
51456b29 | 1275 | if (!skb) |
d883a036 DL |
1276 | return; |
1277 | nlh = nlmsg_hdr(skb); | |
e905a9ed | 1278 | |
573ce260 | 1279 | frn = (struct fib_result_nl *) nlmsg_data(nlh); |
345e9b54 | 1280 | nl_fib_lookup(net, frn); |
e905a9ed | 1281 | |
28a28283 | 1282 | portid = NETLINK_CB(skb).portid; /* netlink portid */ |
15e47304 | 1283 | NETLINK_CB(skb).portid = 0; /* from kernel */ |
ac6d439d | 1284 | NETLINK_CB(skb).dst_group = 0; /* unicast */ |
15e47304 | 1285 | netlink_unicast(net->ipv4.fibnl, skb, portid, MSG_DONTWAIT); |
e905a9ed | 1286 | } |
246955fe | 1287 | |
2c8c1e72 | 1288 | static int __net_init nl_fib_lookup_init(struct net *net) |
246955fe | 1289 | { |
6bd48fcf | 1290 | struct sock *sk; |
a31f2d17 PNA |
1291 | struct netlink_kernel_cfg cfg = { |
1292 | .input = nl_fib_input, | |
1293 | }; | |
1294 | ||
9f00d977 | 1295 | sk = netlink_kernel_create(net, NETLINK_FIB_LOOKUP, &cfg); |
51456b29 | 1296 | if (!sk) |
7b1a74fd | 1297 | return -EAFNOSUPPORT; |
6bd48fcf | 1298 | net->ipv4.fibnl = sk; |
7b1a74fd DL |
1299 | return 0; |
1300 | } | |
1301 | ||
1302 | static void nl_fib_lookup_exit(struct net *net) | |
1303 | { | |
b7c6ba6e | 1304 | netlink_kernel_release(net->ipv4.fibnl); |
775516bf | 1305 | net->ipv4.fibnl = NULL; |
246955fe RO |
1306 | } |
1307 | ||
4f823def JA |
1308 | static void fib_disable_ip(struct net_device *dev, unsigned long event, |
1309 | bool force) | |
1da177e4 | 1310 | { |
4f823def | 1311 | if (fib_sync_down_dev(dev, event, force)) |
c346dca1 | 1312 | fib_flush(dev_net(dev)); |
06b4fc52 GF |
1313 | else |
1314 | rt_cache_flush(dev_net(dev)); | |
1da177e4 LT |
1315 | arp_ifdown(dev); |
1316 | } | |
1317 | ||
1318 | static int fib_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1319 | { | |
6ed2533e | 1320 | struct in_ifaddr *ifa = (struct in_ifaddr *)ptr; |
76e6ebfb | 1321 | struct net_device *dev = ifa->ifa_dev->dev; |
436c3b66 | 1322 | struct net *net = dev_net(dev); |
1da177e4 LT |
1323 | |
1324 | switch (event) { | |
1325 | case NETDEV_UP: | |
1326 | fib_add_ifaddr(ifa); | |
1327 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
8a3d0316 | 1328 | fib_sync_up(dev, RTNH_F_DEAD); |
1da177e4 | 1329 | #endif |
436c3b66 | 1330 | atomic_inc(&net->ipv4.dev_addr_genid); |
4ccfe6d4 | 1331 | rt_cache_flush(dev_net(dev)); |
1da177e4 LT |
1332 | break; |
1333 | case NETDEV_DOWN: | |
e6abbaa2 | 1334 | fib_del_ifaddr(ifa, NULL); |
436c3b66 | 1335 | atomic_inc(&net->ipv4.dev_addr_genid); |
51456b29 | 1336 | if (!ifa->ifa_dev->ifa_list) { |
1da177e4 | 1337 | /* Last address was deleted from this interface. |
6a31d2a9 | 1338 | * Disable IP. |
1da177e4 | 1339 | */ |
4f823def | 1340 | fib_disable_ip(dev, event, true); |
1da177e4 | 1341 | } else { |
4ccfe6d4 | 1342 | rt_cache_flush(dev_net(dev)); |
1da177e4 LT |
1343 | } |
1344 | break; | |
1345 | } | |
1346 | return NOTIFY_DONE; | |
1347 | } | |
1348 | ||
1349 | static int fib_netdev_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1350 | { | |
351638e7 | 1351 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
af7d6cce SD |
1352 | struct netdev_notifier_changeupper_info *upper_info = ptr; |
1353 | struct netdev_notifier_info_ext *info_ext = ptr; | |
0115e8e3 | 1354 | struct in_device *in_dev; |
436c3b66 | 1355 | struct net *net = dev_net(dev); |
8a3d0316 | 1356 | unsigned int flags; |
1da177e4 LT |
1357 | |
1358 | if (event == NETDEV_UNREGISTER) { | |
4f823def | 1359 | fib_disable_ip(dev, event, true); |
caacf05e | 1360 | rt_flush_dev(dev); |
1da177e4 LT |
1361 | return NOTIFY_DONE; |
1362 | } | |
1363 | ||
0115e8e3 | 1364 | in_dev = __in_dev_get_rtnl(dev); |
a0065f26 OH |
1365 | if (!in_dev) |
1366 | return NOTIFY_DONE; | |
0115e8e3 | 1367 | |
1da177e4 LT |
1368 | switch (event) { |
1369 | case NETDEV_UP: | |
1370 | for_ifa(in_dev) { | |
1371 | fib_add_ifaddr(ifa); | |
1372 | } endfor_ifa(in_dev); | |
1373 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
8a3d0316 | 1374 | fib_sync_up(dev, RTNH_F_DEAD); |
1da177e4 | 1375 | #endif |
436c3b66 | 1376 | atomic_inc(&net->ipv4.dev_addr_genid); |
4ccfe6d4 | 1377 | rt_cache_flush(net); |
1da177e4 LT |
1378 | break; |
1379 | case NETDEV_DOWN: | |
4f823def | 1380 | fib_disable_ip(dev, event, false); |
1da177e4 | 1381 | break; |
1da177e4 | 1382 | case NETDEV_CHANGE: |
8a3d0316 AG |
1383 | flags = dev_get_flags(dev); |
1384 | if (flags & (IFF_RUNNING | IFF_LOWER_UP)) | |
1385 | fib_sync_up(dev, RTNH_F_LINKDOWN); | |
1386 | else | |
4f823def | 1387 | fib_sync_down_dev(dev, event, false); |
af7d6cce SD |
1388 | rt_cache_flush(net); |
1389 | break; | |
8a3d0316 | 1390 | case NETDEV_CHANGEMTU: |
af7d6cce | 1391 | fib_sync_mtu(dev, info_ext->ext.mtu); |
4ccfe6d4 | 1392 | rt_cache_flush(net); |
1da177e4 | 1393 | break; |
7f49e7a3 | 1394 | case NETDEV_CHANGEUPPER: |
af7d6cce | 1395 | upper_info = ptr; |
7f49e7a3 DA |
1396 | /* flush all routes if dev is linked to or unlinked from |
1397 | * an L3 master device (e.g., VRF) | |
1398 | */ | |
af7d6cce SD |
1399 | if (upper_info->upper_dev && |
1400 | netif_is_l3_master(upper_info->upper_dev)) | |
7f49e7a3 DA |
1401 | fib_disable_ip(dev, NETDEV_DOWN, true); |
1402 | break; | |
1da177e4 LT |
1403 | } |
1404 | return NOTIFY_DONE; | |
1405 | } | |
1406 | ||
1407 | static struct notifier_block fib_inetaddr_notifier = { | |
6ed2533e | 1408 | .notifier_call = fib_inetaddr_event, |
1da177e4 LT |
1409 | }; |
1410 | ||
1411 | static struct notifier_block fib_netdev_notifier = { | |
6ed2533e | 1412 | .notifier_call = fib_netdev_event, |
1da177e4 LT |
1413 | }; |
1414 | ||
7b1a74fd | 1415 | static int __net_init ip_fib_net_init(struct net *net) |
1da177e4 | 1416 | { |
dce5cbee | 1417 | int err; |
10da66f7 ED |
1418 | size_t size = sizeof(struct hlist_head) * FIB_TABLE_HASHSZ; |
1419 | ||
04b1d4e5 IS |
1420 | err = fib4_notifier_init(net); |
1421 | if (err) | |
1422 | return err; | |
cacaad11 | 1423 | |
10da66f7 ED |
1424 | /* Avoid false sharing : Use at least a full cache line */ |
1425 | size = max_t(size_t, size, L1_CACHE_BYTES); | |
1af5a8c4 | 1426 | |
10da66f7 | 1427 | net->ipv4.fib_table_hash = kzalloc(size, GFP_KERNEL); |
04b1d4e5 IS |
1428 | if (!net->ipv4.fib_table_hash) { |
1429 | err = -ENOMEM; | |
1430 | goto err_table_hash_alloc; | |
1431 | } | |
e4aef8ae | 1432 | |
dce5cbee DL |
1433 | err = fib4_rules_init(net); |
1434 | if (err < 0) | |
04b1d4e5 | 1435 | goto err_rules_init; |
dce5cbee DL |
1436 | return 0; |
1437 | ||
04b1d4e5 | 1438 | err_rules_init: |
dce5cbee | 1439 | kfree(net->ipv4.fib_table_hash); |
04b1d4e5 IS |
1440 | err_table_hash_alloc: |
1441 | fib4_notifier_exit(net); | |
dce5cbee | 1442 | return err; |
7b1a74fd | 1443 | } |
1da177e4 | 1444 | |
2c8c1e72 | 1445 | static void ip_fib_net_exit(struct net *net) |
7b1a74fd | 1446 | { |
b4681c28 | 1447 | int i; |
7b1a74fd | 1448 | |
6dede75b | 1449 | rtnl_lock(); |
6e47d6ca | 1450 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
6e47d6ca AD |
1451 | RCU_INIT_POINTER(net->ipv4.fib_main, NULL); |
1452 | RCU_INIT_POINTER(net->ipv4.fib_default, NULL); | |
1453 | #endif | |
b4681c28 IS |
1454 | /* Destroy the tables in reverse order to guarantee that the |
1455 | * local table, ID 255, is destroyed before the main table, ID | |
1456 | * 254. This is necessary as the local table may contain | |
1457 | * references to data contained in the main table. | |
1458 | */ | |
1459 | for (i = FIB_TABLE_HASHSZ - 1; i >= 0; i--) { | |
a7e53531 | 1460 | struct hlist_head *head = &net->ipv4.fib_table_hash[i]; |
b67bfe0d | 1461 | struct hlist_node *tmp; |
a7e53531 AD |
1462 | struct fib_table *tb; |
1463 | ||
b67bfe0d SL |
1464 | hlist_for_each_entry_safe(tb, tmp, head, tb_hlist) { |
1465 | hlist_del(&tb->tb_hlist); | |
f97f4dd8 | 1466 | fib_table_flush(net, tb, true); |
4aa2c466 | 1467 | fib_free_table(tb); |
7b1a74fd DL |
1468 | } |
1469 | } | |
ad88d051 AD |
1470 | |
1471 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
1472 | fib4_rules_exit(net); | |
1473 | #endif | |
e2666f84 | 1474 | rtnl_unlock(); |
e4aef8ae | 1475 | kfree(net->ipv4.fib_table_hash); |
04b1d4e5 | 1476 | fib4_notifier_exit(net); |
7b1a74fd DL |
1477 | } |
1478 | ||
1479 | static int __net_init fib_net_init(struct net *net) | |
1480 | { | |
1481 | int error; | |
1482 | ||
f4530fa5 DM |
1483 | #ifdef CONFIG_IP_ROUTE_CLASSID |
1484 | net->ipv4.fib_num_tclassid_users = 0; | |
1485 | #endif | |
7b1a74fd DL |
1486 | error = ip_fib_net_init(net); |
1487 | if (error < 0) | |
1488 | goto out; | |
1489 | error = nl_fib_lookup_init(net); | |
1490 | if (error < 0) | |
1491 | goto out_nlfl; | |
1492 | error = fib_proc_init(net); | |
1493 | if (error < 0) | |
1494 | goto out_proc; | |
1495 | out: | |
1496 | return error; | |
1497 | ||
1498 | out_proc: | |
1499 | nl_fib_lookup_exit(net); | |
1500 | out_nlfl: | |
1501 | ip_fib_net_exit(net); | |
1502 | goto out; | |
1503 | } | |
1504 | ||
1505 | static void __net_exit fib_net_exit(struct net *net) | |
1506 | { | |
1507 | fib_proc_exit(net); | |
1508 | nl_fib_lookup_exit(net); | |
1509 | ip_fib_net_exit(net); | |
1510 | } | |
1511 | ||
1512 | static struct pernet_operations fib_net_ops = { | |
1513 | .init = fib_net_init, | |
1514 | .exit = fib_net_exit, | |
1515 | }; | |
1516 | ||
1517 | void __init ip_fib_init(void) | |
1518 | { | |
8799a221 | 1519 | fib_trie_init(); |
7b1a74fd DL |
1520 | |
1521 | register_pernet_subsys(&fib_net_ops); | |
8799a221 | 1522 | |
7b1a74fd DL |
1523 | register_netdevice_notifier(&fib_netdev_notifier); |
1524 | register_inetaddr_notifier(&fib_inetaddr_notifier); | |
7f9b8052 | 1525 | |
b97bac64 FW |
1526 | rtnl_register(PF_INET, RTM_NEWROUTE, inet_rtm_newroute, NULL, 0); |
1527 | rtnl_register(PF_INET, RTM_DELROUTE, inet_rtm_delroute, NULL, 0); | |
1528 | rtnl_register(PF_INET, RTM_GETROUTE, NULL, inet_dump_fib, 0); | |
1da177e4 | 1529 | } |