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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | * INET An implementation of the TCP/IP protocol suite for the LINUX | |
4 | * operating system. INET is implemented using the BSD Socket | |
5 | * interface as the means of communication with the user level. | |
6 | * | |
7 | * IPv4 Forwarding Information Base: FIB frontend. | |
8 | * | |
1da177e4 | 9 | * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> |
1da177e4 LT |
10 | */ |
11 | ||
1da177e4 | 12 | #include <linux/module.h> |
7c0f6ba6 | 13 | #include <linux/uaccess.h> |
1da177e4 | 14 | #include <linux/bitops.h> |
4fc268d2 | 15 | #include <linux/capability.h> |
1da177e4 LT |
16 | #include <linux/types.h> |
17 | #include <linux/kernel.h> | |
1da177e4 LT |
18 | #include <linux/mm.h> |
19 | #include <linux/string.h> | |
20 | #include <linux/socket.h> | |
21 | #include <linux/sockios.h> | |
22 | #include <linux/errno.h> | |
23 | #include <linux/in.h> | |
24 | #include <linux/inet.h> | |
14c85021 | 25 | #include <linux/inetdevice.h> |
1da177e4 | 26 | #include <linux/netdevice.h> |
1823730f | 27 | #include <linux/if_addr.h> |
1da177e4 LT |
28 | #include <linux/if_arp.h> |
29 | #include <linux/skbuff.h> | |
7a9bc9b8 | 30 | #include <linux/cache.h> |
1da177e4 | 31 | #include <linux/init.h> |
1af5a8c4 | 32 | #include <linux/list.h> |
5a0e3ad6 | 33 | #include <linux/slab.h> |
1da177e4 LT |
34 | |
35 | #include <net/ip.h> | |
36 | #include <net/protocol.h> | |
37 | #include <net/route.h> | |
38 | #include <net/tcp.h> | |
39 | #include <net/sock.h> | |
1da177e4 LT |
40 | #include <net/arp.h> |
41 | #include <net/ip_fib.h> | |
5481d73f | 42 | #include <net/nexthop.h> |
63f3444f | 43 | #include <net/rtnetlink.h> |
990078af | 44 | #include <net/xfrm.h> |
385add90 | 45 | #include <net/l3mdev.h> |
9ed59592 | 46 | #include <net/lwtunnel.h> |
f6d3c192 | 47 | #include <trace/events/fib.h> |
1da177e4 | 48 | |
1da177e4 LT |
49 | #ifndef CONFIG_IP_MULTIPLE_TABLES |
50 | ||
7b1a74fd | 51 | static int __net_init fib4_rules_init(struct net *net) |
c3e9a353 | 52 | { |
93456b6d DL |
53 | struct fib_table *local_table, *main_table; |
54 | ||
0ddcf43d | 55 | main_table = fib_trie_table(RT_TABLE_MAIN, NULL); |
51456b29 | 56 | if (!main_table) |
61f0d861 | 57 | return -ENOMEM; |
dbb50165 | 58 | |
0ddcf43d | 59 | local_table = fib_trie_table(RT_TABLE_LOCAL, main_table); |
51456b29 | 60 | if (!local_table) |
61f0d861 | 61 | goto fail; |
0ddcf43d | 62 | |
93456b6d | 63 | hlist_add_head_rcu(&local_table->tb_hlist, |
e4aef8ae | 64 | &net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX]); |
93456b6d | 65 | hlist_add_head_rcu(&main_table->tb_hlist, |
e4aef8ae | 66 | &net->ipv4.fib_table_hash[TABLE_MAIN_INDEX]); |
dbb50165 DL |
67 | return 0; |
68 | ||
69 | fail: | |
61f0d861 | 70 | fib_free_table(main_table); |
dbb50165 | 71 | return -ENOMEM; |
c3e9a353 | 72 | } |
032a4802 PA |
73 | |
74 | static bool fib4_has_custom_rules(struct net *net) | |
75 | { | |
76 | return false; | |
77 | } | |
1af5a8c4 | 78 | #else |
1da177e4 | 79 | |
8ad4942c | 80 | struct fib_table *fib_new_table(struct net *net, u32 id) |
1da177e4 | 81 | { |
0ddcf43d | 82 | struct fib_table *tb, *alias = NULL; |
1af5a8c4 | 83 | unsigned int h; |
1da177e4 | 84 | |
1af5a8c4 PM |
85 | if (id == 0) |
86 | id = RT_TABLE_MAIN; | |
8ad4942c | 87 | tb = fib_get_table(net, id); |
1af5a8c4 PM |
88 | if (tb) |
89 | return tb; | |
7f9b8052 | 90 | |
5350d54f | 91 | if (id == RT_TABLE_LOCAL && !net->ipv4.fib_has_custom_rules) |
0ddcf43d AD |
92 | alias = fib_new_table(net, RT_TABLE_MAIN); |
93 | ||
94 | tb = fib_trie_table(id, alias); | |
1da177e4 LT |
95 | if (!tb) |
96 | return NULL; | |
f4530fa5 DM |
97 | |
98 | switch (id) { | |
f4530fa5 | 99 | case RT_TABLE_MAIN: |
a7e53531 | 100 | rcu_assign_pointer(net->ipv4.fib_main, tb); |
f4530fa5 | 101 | break; |
f4530fa5 | 102 | case RT_TABLE_DEFAULT: |
a7e53531 | 103 | rcu_assign_pointer(net->ipv4.fib_default, tb); |
f4530fa5 | 104 | break; |
f4530fa5 DM |
105 | default: |
106 | break; | |
107 | } | |
108 | ||
1af5a8c4 | 109 | h = id & (FIB_TABLE_HASHSZ - 1); |
e4aef8ae | 110 | hlist_add_head_rcu(&tb->tb_hlist, &net->ipv4.fib_table_hash[h]); |
1da177e4 LT |
111 | return tb; |
112 | } | |
b3b4663c | 113 | EXPORT_SYMBOL_GPL(fib_new_table); |
1da177e4 | 114 | |
345e9b54 | 115 | /* caller must hold either rtnl or rcu read lock */ |
8ad4942c | 116 | struct fib_table *fib_get_table(struct net *net, u32 id) |
1af5a8c4 PM |
117 | { |
118 | struct fib_table *tb; | |
e4aef8ae | 119 | struct hlist_head *head; |
1af5a8c4 | 120 | unsigned int h; |
1da177e4 | 121 | |
1af5a8c4 PM |
122 | if (id == 0) |
123 | id = RT_TABLE_MAIN; | |
124 | h = id & (FIB_TABLE_HASHSZ - 1); | |
e4aef8ae | 125 | |
e4aef8ae | 126 | head = &net->ipv4.fib_table_hash[h]; |
7fd69b0b JFG |
127 | hlist_for_each_entry_rcu(tb, head, tb_hlist, |
128 | lockdep_rtnl_is_held()) { | |
345e9b54 | 129 | if (tb->tb_id == id) |
1af5a8c4 | 130 | return tb; |
1af5a8c4 | 131 | } |
1af5a8c4 PM |
132 | return NULL; |
133 | } | |
032a4802 PA |
134 | |
135 | static bool fib4_has_custom_rules(struct net *net) | |
136 | { | |
137 | return net->ipv4.fib_has_custom_rules; | |
138 | } | |
1da177e4 LT |
139 | #endif /* CONFIG_IP_MULTIPLE_TABLES */ |
140 | ||
0ddcf43d AD |
141 | static void fib_replace_table(struct net *net, struct fib_table *old, |
142 | struct fib_table *new) | |
143 | { | |
144 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
145 | switch (new->tb_id) { | |
0ddcf43d AD |
146 | case RT_TABLE_MAIN: |
147 | rcu_assign_pointer(net->ipv4.fib_main, new); | |
148 | break; | |
149 | case RT_TABLE_DEFAULT: | |
150 | rcu_assign_pointer(net->ipv4.fib_default, new); | |
151 | break; | |
152 | default: | |
153 | break; | |
154 | } | |
155 | ||
156 | #endif | |
157 | /* replace the old table in the hlist */ | |
158 | hlist_replace_rcu(&old->tb_hlist, &new->tb_hlist); | |
159 | } | |
160 | ||
161 | int fib_unmerge(struct net *net) | |
162 | { | |
3b709334 | 163 | struct fib_table *old, *new, *main_table; |
0ddcf43d | 164 | |
3c9e9f73 | 165 | /* attempt to fetch local table if it has been allocated */ |
0ddcf43d | 166 | old = fib_get_table(net, RT_TABLE_LOCAL); |
3c9e9f73 AD |
167 | if (!old) |
168 | return 0; | |
0ddcf43d | 169 | |
3c9e9f73 | 170 | new = fib_trie_unmerge(old); |
0ddcf43d AD |
171 | if (!new) |
172 | return -ENOMEM; | |
173 | ||
3b709334 AD |
174 | /* table is already unmerged */ |
175 | if (new == old) | |
176 | return 0; | |
177 | ||
0ddcf43d | 178 | /* replace merged table with clean table */ |
3b709334 AD |
179 | fib_replace_table(net, old, new); |
180 | fib_free_table(old); | |
181 | ||
182 | /* attempt to fetch main table if it has been allocated */ | |
183 | main_table = fib_get_table(net, RT_TABLE_MAIN); | |
184 | if (!main_table) | |
185 | return 0; | |
186 | ||
187 | /* flush local entries from main table */ | |
188 | fib_table_flush_external(main_table); | |
0ddcf43d AD |
189 | |
190 | return 0; | |
191 | } | |
192 | ||
9bd83667 | 193 | void fib_flush(struct net *net) |
1da177e4 LT |
194 | { |
195 | int flushed = 0; | |
1af5a8c4 | 196 | unsigned int h; |
1da177e4 | 197 | |
1af5a8c4 | 198 | for (h = 0; h < FIB_TABLE_HASHSZ; h++) { |
a7e53531 AD |
199 | struct hlist_head *head = &net->ipv4.fib_table_hash[h]; |
200 | struct hlist_node *tmp; | |
201 | struct fib_table *tb; | |
202 | ||
203 | hlist_for_each_entry_safe(tb, tmp, head, tb_hlist) | |
f97f4dd8 | 204 | flushed += fib_table_flush(net, tb, false); |
1da177e4 | 205 | } |
1da177e4 LT |
206 | |
207 | if (flushed) | |
4ccfe6d4 | 208 | rt_cache_flush(net); |
1da177e4 LT |
209 | } |
210 | ||
05538116 LAT |
211 | /* |
212 | * Find address type as if only "dev" was present in the system. If | |
213 | * on_dev is NULL then all interfaces are taken into consideration. | |
214 | */ | |
95c96174 ED |
215 | static inline unsigned int __inet_dev_addr_type(struct net *net, |
216 | const struct net_device *dev, | |
9b8ff518 | 217 | __be32 addr, u32 tb_id) |
1da177e4 | 218 | { |
9ade2286 | 219 | struct flowi4 fl4 = { .daddr = addr }; |
1da177e4 | 220 | struct fib_result res; |
95c96174 | 221 | unsigned int ret = RTN_BROADCAST; |
15be405e | 222 | struct fib_table *table; |
1da177e4 | 223 | |
1e637c74 | 224 | if (ipv4_is_zeronet(addr) || ipv4_is_lbcast(addr)) |
1da177e4 | 225 | return RTN_BROADCAST; |
f97c1e0c | 226 | if (ipv4_is_multicast(addr)) |
1da177e4 LT |
227 | return RTN_MULTICAST; |
228 | ||
345e9b54 AD |
229 | rcu_read_lock(); |
230 | ||
15be405e DA |
231 | table = fib_get_table(net, tb_id); |
232 | if (table) { | |
1da177e4 | 233 | ret = RTN_UNICAST; |
15be405e | 234 | if (!fib_table_lookup(table, &fl4, &res, FIB_LOOKUP_NOREF)) { |
dcb1ecb5 | 235 | struct fib_nh_common *nhc = fib_info_nhc(res.fi, 0); |
5481d73f | 236 | |
dcb1ecb5 | 237 | if (!dev || dev == nhc->nhc_dev) |
05538116 | 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)) |
eba618ab | 310 | return fib_result_prefsrc(net, &res); |
a207a4b2 DM |
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 | ||
5481d73f | 324 | for (ret = 0; ret < fib_info_num_path(fi); ret++) { |
dcb1ecb5 | 325 | const struct fib_nh_common *nhc = fib_info_nhc(fi, ret); |
78f2756c | 326 | |
dcb1ecb5 | 327 | if (nhc->nhc_dev == dev) { |
78f2756c DA |
328 | dev_match = true; |
329 | break; | |
dcb1ecb5 | 330 | } else if (l3mdev_master_ifindex_rcu(nhc->nhc_dev) == dev->ifindex) { |
78f2756c DA |
331 | dev_match = true; |
332 | break; | |
333 | } | |
334 | } | |
335 | #else | |
dcb1ecb5 | 336 | if (fib_info_nhc(fi, 0)->nhc_dev == dev) |
78f2756c DA |
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); |
66f82095 CW |
392 | /* This is not common, loopback packets retain skb_dst so normally they |
393 | * would not even hit this slow path. | |
394 | */ | |
395 | dev_match = dev_match || (res.type == RTN_LOCAL && | |
396 | dev == net->loopback_dev); | |
6f86b325 | 397 | if (dev_match) { |
eba618ab | 398 | ret = FIB_RES_NHC(res)->nhc_scope >= RT_SCOPE_HOST; |
1da177e4 LT |
399 | return ret; |
400 | } | |
1da177e4 LT |
401 | if (no_addr) |
402 | goto last_resort; | |
c1cf8422 | 403 | if (rpf == 1) |
b5f7e755 | 404 | goto e_rpf; |
9ade2286 | 405 | fl4.flowi4_oif = dev->ifindex; |
1da177e4 LT |
406 | |
407 | ret = 0; | |
0eeb075f | 408 | if (fib_lookup(net, &fl4, &res, FIB_LOOKUP_IGNORE_LINKSTATE) == 0) { |
41347dcd | 409 | if (res.type == RTN_UNICAST) |
eba618ab | 410 | ret = FIB_RES_NHC(res)->nhc_scope >= RT_SCOPE_HOST; |
1da177e4 LT |
411 | } |
412 | return ret; | |
413 | ||
414 | last_resort: | |
415 | if (rpf) | |
b5f7e755 | 416 | goto e_rpf; |
1da177e4 LT |
417 | *itag = 0; |
418 | return 0; | |
419 | ||
1da177e4 LT |
420 | e_inval: |
421 | return -EINVAL; | |
b5f7e755 ED |
422 | e_rpf: |
423 | return -EXDEV; | |
1da177e4 LT |
424 | } |
425 | ||
7a9bc9b8 DM |
426 | /* Ignore rp_filter for packets protected by IPsec. */ |
427 | int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst, | |
428 | u8 tos, int oif, struct net_device *dev, | |
429 | struct in_device *idev, u32 *itag) | |
430 | { | |
431 | int r = secpath_exists(skb) ? 0 : IN_DEV_RPFILTER(idev); | |
6e617de8 | 432 | struct net *net = dev_net(dev); |
7a9bc9b8 | 433 | |
6e617de8 | 434 | if (!r && !fib_num_tclassid_users(net) && |
e81da0e1 | 435 | (dev->ifindex != oif || !IN_DEV_TX_REDIRECTS(idev))) { |
6e617de8 PA |
436 | if (IN_DEV_ACCEPT_LOCAL(idev)) |
437 | goto ok; | |
032a4802 PA |
438 | /* with custom local routes in place, checking local addresses |
439 | * only will be too optimistic, with custom rules, checking | |
440 | * local addresses only can be too strict, e.g. due to vrf | |
6e617de8 | 441 | */ |
032a4802 PA |
442 | if (net->ipv4.fib_has_custom_local_routes || |
443 | fib4_has_custom_rules(net)) | |
6e617de8 PA |
444 | goto full_check; |
445 | if (inet_lookup_ifaddr_rcu(net, src)) | |
446 | return -EINVAL; | |
447 | ||
448 | ok: | |
7a9bc9b8 DM |
449 | *itag = 0; |
450 | return 0; | |
451 | } | |
6e617de8 PA |
452 | |
453 | full_check: | |
7a9bc9b8 DM |
454 | return __fib_validate_source(skb, src, dst, tos, oif, dev, r, idev, itag); |
455 | } | |
456 | ||
81f7bf6c | 457 | static inline __be32 sk_extract_addr(struct sockaddr *addr) |
4e902c57 TG |
458 | { |
459 | return ((struct sockaddr_in *) addr)->sin_addr.s_addr; | |
460 | } | |
461 | ||
462 | static int put_rtax(struct nlattr *mx, int len, int type, u32 value) | |
463 | { | |
464 | struct nlattr *nla; | |
465 | ||
466 | nla = (struct nlattr *) ((char *) mx + len); | |
467 | nla->nla_type = type; | |
468 | nla->nla_len = nla_attr_size(4); | |
469 | *(u32 *) nla_data(nla) = value; | |
470 | ||
471 | return len + nla_total_size(4); | |
472 | } | |
473 | ||
4b5d47d4 | 474 | static int rtentry_to_fib_config(struct net *net, int cmd, struct rtentry *rt, |
4e902c57 TG |
475 | struct fib_config *cfg) |
476 | { | |
6d85c10a | 477 | __be32 addr; |
4e902c57 TG |
478 | int plen; |
479 | ||
480 | memset(cfg, 0, sizeof(*cfg)); | |
4b5d47d4 | 481 | cfg->fc_nlinfo.nl_net = net; |
4e902c57 TG |
482 | |
483 | if (rt->rt_dst.sa_family != AF_INET) | |
484 | return -EAFNOSUPPORT; | |
485 | ||
486 | /* | |
487 | * Check mask for validity: | |
488 | * a) it must be contiguous. | |
489 | * b) destination must have all host bits clear. | |
490 | * c) if application forgot to set correct family (AF_INET), | |
491 | * reject request unless it is absolutely clear i.e. | |
492 | * both family and mask are zero. | |
493 | */ | |
494 | plen = 32; | |
495 | addr = sk_extract_addr(&rt->rt_dst); | |
496 | if (!(rt->rt_flags & RTF_HOST)) { | |
81f7bf6c | 497 | __be32 mask = sk_extract_addr(&rt->rt_genmask); |
4e902c57 TG |
498 | |
499 | if (rt->rt_genmask.sa_family != AF_INET) { | |
500 | if (mask || rt->rt_genmask.sa_family) | |
501 | return -EAFNOSUPPORT; | |
502 | } | |
503 | ||
504 | if (bad_mask(mask, addr)) | |
505 | return -EINVAL; | |
506 | ||
507 | plen = inet_mask_len(mask); | |
508 | } | |
509 | ||
510 | cfg->fc_dst_len = plen; | |
511 | cfg->fc_dst = addr; | |
512 | ||
513 | if (cmd != SIOCDELRT) { | |
514 | cfg->fc_nlflags = NLM_F_CREATE; | |
515 | cfg->fc_protocol = RTPROT_BOOT; | |
516 | } | |
517 | ||
518 | if (rt->rt_metric) | |
519 | cfg->fc_priority = rt->rt_metric - 1; | |
520 | ||
521 | if (rt->rt_flags & RTF_REJECT) { | |
522 | cfg->fc_scope = RT_SCOPE_HOST; | |
523 | cfg->fc_type = RTN_UNREACHABLE; | |
524 | return 0; | |
525 | } | |
526 | ||
527 | cfg->fc_scope = RT_SCOPE_NOWHERE; | |
528 | cfg->fc_type = RTN_UNICAST; | |
529 | ||
530 | if (rt->rt_dev) { | |
531 | char *colon; | |
532 | struct net_device *dev; | |
533 | char devname[IFNAMSIZ]; | |
534 | ||
535 | if (copy_from_user(devname, rt->rt_dev, IFNAMSIZ-1)) | |
536 | return -EFAULT; | |
537 | ||
538 | devname[IFNAMSIZ-1] = 0; | |
539 | colon = strchr(devname, ':'); | |
540 | if (colon) | |
541 | *colon = 0; | |
4b5d47d4 | 542 | dev = __dev_get_by_name(net, devname); |
4e902c57 TG |
543 | if (!dev) |
544 | return -ENODEV; | |
545 | cfg->fc_oif = dev->ifindex; | |
5a56a0b3 | 546 | cfg->fc_table = l3mdev_fib_table(dev); |
4e902c57 | 547 | if (colon) { |
cd5a411d FW |
548 | const struct in_ifaddr *ifa; |
549 | struct in_device *in_dev; | |
550 | ||
551 | in_dev = __in_dev_get_rtnl(dev); | |
4e902c57 TG |
552 | if (!in_dev) |
553 | return -ENODEV; | |
cd5a411d | 554 | |
4e902c57 | 555 | *colon = ':'; |
cd5a411d FW |
556 | |
557 | rcu_read_lock(); | |
558 | in_dev_for_each_ifa_rcu(ifa, in_dev) { | |
4e902c57 TG |
559 | if (strcmp(ifa->ifa_label, devname) == 0) |
560 | break; | |
cd5a411d FW |
561 | } |
562 | rcu_read_unlock(); | |
563 | ||
51456b29 | 564 | if (!ifa) |
4e902c57 TG |
565 | return -ENODEV; |
566 | cfg->fc_prefsrc = ifa->ifa_local; | |
567 | } | |
568 | } | |
569 | ||
570 | addr = sk_extract_addr(&rt->rt_gateway); | |
571 | if (rt->rt_gateway.sa_family == AF_INET && addr) { | |
30bbaa19 DA |
572 | unsigned int addr_type; |
573 | ||
f35b794b DA |
574 | cfg->fc_gw4 = addr; |
575 | cfg->fc_gw_family = AF_INET; | |
30bbaa19 | 576 | addr_type = inet_addr_type_table(net, addr, cfg->fc_table); |
4e902c57 | 577 | if (rt->rt_flags & RTF_GATEWAY && |
30bbaa19 | 578 | addr_type == RTN_UNICAST) |
4e902c57 TG |
579 | cfg->fc_scope = RT_SCOPE_UNIVERSE; |
580 | } | |
581 | ||
582 | if (cmd == SIOCDELRT) | |
583 | return 0; | |
584 | ||
f35b794b | 585 | if (rt->rt_flags & RTF_GATEWAY && !cfg->fc_gw_family) |
4e902c57 TG |
586 | return -EINVAL; |
587 | ||
588 | if (cfg->fc_scope == RT_SCOPE_NOWHERE) | |
589 | cfg->fc_scope = RT_SCOPE_LINK; | |
590 | ||
591 | if (rt->rt_flags & (RTF_MTU | RTF_WINDOW | RTF_IRTT)) { | |
592 | struct nlattr *mx; | |
593 | int len = 0; | |
594 | ||
6396bb22 | 595 | mx = kcalloc(3, nla_total_size(4), GFP_KERNEL); |
51456b29 | 596 | if (!mx) |
4e902c57 TG |
597 | return -ENOMEM; |
598 | ||
599 | if (rt->rt_flags & RTF_MTU) | |
600 | len = put_rtax(mx, len, RTAX_ADVMSS, rt->rt_mtu - 40); | |
601 | ||
602 | if (rt->rt_flags & RTF_WINDOW) | |
603 | len = put_rtax(mx, len, RTAX_WINDOW, rt->rt_window); | |
604 | ||
605 | if (rt->rt_flags & RTF_IRTT) | |
606 | len = put_rtax(mx, len, RTAX_RTT, rt->rt_irtt << 3); | |
607 | ||
608 | cfg->fc_mx = mx; | |
609 | cfg->fc_mx_len = len; | |
610 | } | |
611 | ||
612 | return 0; | |
613 | } | |
614 | ||
1da177e4 | 615 | /* |
6a31d2a9 ED |
616 | * Handle IP routing ioctl calls. |
617 | * These are used to manipulate the routing tables | |
1da177e4 | 618 | */ |
ca25c300 | 619 | int ip_rt_ioctl(struct net *net, unsigned int cmd, struct rtentry *rt) |
1da177e4 | 620 | { |
4e902c57 | 621 | struct fib_config cfg; |
1da177e4 | 622 | int err; |
1da177e4 LT |
623 | |
624 | switch (cmd) { | |
625 | case SIOCADDRT: /* Add a route */ | |
626 | case SIOCDELRT: /* Delete a route */ | |
52e804c6 | 627 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 | 628 | return -EPERM; |
4e902c57 | 629 | |
1da177e4 | 630 | rtnl_lock(); |
ca25c300 | 631 | err = rtentry_to_fib_config(net, cmd, rt, &cfg); |
1da177e4 | 632 | if (err == 0) { |
4e902c57 TG |
633 | struct fib_table *tb; |
634 | ||
1da177e4 | 635 | if (cmd == SIOCDELRT) { |
1bad118a | 636 | tb = fib_get_table(net, cfg.fc_table); |
1da177e4 | 637 | if (tb) |
78055998 DA |
638 | err = fib_table_delete(net, tb, &cfg, |
639 | NULL); | |
4e902c57 TG |
640 | else |
641 | err = -ESRCH; | |
1da177e4 | 642 | } else { |
1bad118a | 643 | tb = fib_new_table(net, cfg.fc_table); |
1da177e4 | 644 | if (tb) |
6d8422a1 DA |
645 | err = fib_table_insert(net, tb, |
646 | &cfg, NULL); | |
4e902c57 TG |
647 | else |
648 | err = -ENOBUFS; | |
1da177e4 | 649 | } |
4e902c57 TG |
650 | |
651 | /* allocated by rtentry_to_fib_config() */ | |
652 | kfree(cfg.fc_mx); | |
1da177e4 LT |
653 | } |
654 | rtnl_unlock(); | |
655 | return err; | |
656 | } | |
657 | return -EINVAL; | |
658 | } | |
659 | ||
6a31d2a9 | 660 | const struct nla_policy rtm_ipv4_policy[RTA_MAX + 1] = { |
75425657 | 661 | [RTA_UNSPEC] = { .strict_start_type = RTA_DPORT + 1 }, |
4e902c57 TG |
662 | [RTA_DST] = { .type = NLA_U32 }, |
663 | [RTA_SRC] = { .type = NLA_U32 }, | |
664 | [RTA_IIF] = { .type = NLA_U32 }, | |
665 | [RTA_OIF] = { .type = NLA_U32 }, | |
666 | [RTA_GATEWAY] = { .type = NLA_U32 }, | |
667 | [RTA_PRIORITY] = { .type = NLA_U32 }, | |
668 | [RTA_PREFSRC] = { .type = NLA_U32 }, | |
669 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
5176f91e | 670 | [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) }, |
4e902c57 | 671 | [RTA_FLOW] = { .type = NLA_U32 }, |
571e7226 RP |
672 | [RTA_ENCAP_TYPE] = { .type = NLA_U16 }, |
673 | [RTA_ENCAP] = { .type = NLA_NESTED }, | |
622ec2c9 | 674 | [RTA_UID] = { .type = NLA_U32 }, |
3b45a410 | 675 | [RTA_MARK] = { .type = NLA_U32 }, |
2eabd764 | 676 | [RTA_TABLE] = { .type = NLA_U32 }, |
404eb77e RP |
677 | [RTA_IP_PROTO] = { .type = NLA_U8 }, |
678 | [RTA_SPORT] = { .type = NLA_U16 }, | |
679 | [RTA_DPORT] = { .type = NLA_U16 }, | |
493ced1a | 680 | [RTA_NH_ID] = { .type = NLA_U32 }, |
4e902c57 TG |
681 | }; |
682 | ||
d1566268 DA |
683 | int fib_gw_from_via(struct fib_config *cfg, struct nlattr *nla, |
684 | struct netlink_ext_ack *extack) | |
685 | { | |
686 | struct rtvia *via; | |
687 | int alen; | |
688 | ||
689 | if (nla_len(nla) < offsetof(struct rtvia, rtvia_addr)) { | |
690 | NL_SET_ERR_MSG(extack, "Invalid attribute length for RTA_VIA"); | |
691 | return -EINVAL; | |
692 | } | |
693 | ||
694 | via = nla_data(nla); | |
695 | alen = nla_len(nla) - offsetof(struct rtvia, rtvia_addr); | |
696 | ||
697 | switch (via->rtvia_family) { | |
698 | case AF_INET: | |
699 | if (alen != sizeof(__be32)) { | |
700 | NL_SET_ERR_MSG(extack, "Invalid IPv4 address in RTA_VIA"); | |
701 | return -EINVAL; | |
702 | } | |
703 | cfg->fc_gw_family = AF_INET; | |
704 | cfg->fc_gw4 = *((__be32 *)via->rtvia_addr); | |
705 | break; | |
706 | case AF_INET6: | |
707 | #ifdef CONFIG_IPV6 | |
708 | if (alen != sizeof(struct in6_addr)) { | |
709 | NL_SET_ERR_MSG(extack, "Invalid IPv6 address in RTA_VIA"); | |
710 | return -EINVAL; | |
711 | } | |
712 | cfg->fc_gw_family = AF_INET6; | |
713 | cfg->fc_gw6 = *((struct in6_addr *)via->rtvia_addr); | |
714 | #else | |
715 | NL_SET_ERR_MSG(extack, "IPv6 support not enabled in kernel"); | |
716 | return -EINVAL; | |
717 | #endif | |
718 | break; | |
719 | default: | |
720 | NL_SET_ERR_MSG(extack, "Unsupported address family in RTA_VIA"); | |
721 | return -EINVAL; | |
722 | } | |
723 | ||
724 | return 0; | |
725 | } | |
726 | ||
4b5d47d4 | 727 | static int rtm_to_fib_config(struct net *net, struct sk_buff *skb, |
6d8422a1 DA |
728 | struct nlmsghdr *nlh, struct fib_config *cfg, |
729 | struct netlink_ext_ack *extack) | |
1da177e4 | 730 | { |
d1566268 | 731 | bool has_gw = false, has_via = false; |
4e902c57 TG |
732 | struct nlattr *attr; |
733 | int err, remaining; | |
734 | struct rtmsg *rtm; | |
735 | ||
8cb08174 JB |
736 | err = nlmsg_validate_deprecated(nlh, sizeof(*rtm), RTA_MAX, |
737 | rtm_ipv4_policy, extack); | |
4e902c57 TG |
738 | if (err < 0) |
739 | goto errout; | |
740 | ||
741 | memset(cfg, 0, sizeof(*cfg)); | |
742 | ||
743 | rtm = nlmsg_data(nlh); | |
4e902c57 | 744 | cfg->fc_dst_len = rtm->rtm_dst_len; |
4e902c57 TG |
745 | cfg->fc_tos = rtm->rtm_tos; |
746 | cfg->fc_table = rtm->rtm_table; | |
747 | cfg->fc_protocol = rtm->rtm_protocol; | |
748 | cfg->fc_scope = rtm->rtm_scope; | |
749 | cfg->fc_type = rtm->rtm_type; | |
750 | cfg->fc_flags = rtm->rtm_flags; | |
751 | cfg->fc_nlflags = nlh->nlmsg_flags; | |
752 | ||
15e47304 | 753 | cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid; |
4e902c57 | 754 | cfg->fc_nlinfo.nlh = nlh; |
4b5d47d4 | 755 | cfg->fc_nlinfo.nl_net = net; |
4e902c57 | 756 | |
a0ee18b9 | 757 | if (cfg->fc_type > RTN_MAX) { |
c3ab2b4e | 758 | NL_SET_ERR_MSG(extack, "Invalid route type"); |
a0ee18b9 TG |
759 | err = -EINVAL; |
760 | goto errout; | |
761 | } | |
762 | ||
4e902c57 | 763 | nlmsg_for_each_attr(attr, nlh, sizeof(struct rtmsg), remaining) { |
8f4c1f9b | 764 | switch (nla_type(attr)) { |
4e902c57 | 765 | case RTA_DST: |
17fb2c64 | 766 | cfg->fc_dst = nla_get_be32(attr); |
4e902c57 | 767 | break; |
4e902c57 TG |
768 | case RTA_OIF: |
769 | cfg->fc_oif = nla_get_u32(attr); | |
770 | break; | |
771 | case RTA_GATEWAY: | |
d1566268 | 772 | has_gw = true; |
f35b794b | 773 | cfg->fc_gw4 = nla_get_be32(attr); |
d73f80f9 DA |
774 | if (cfg->fc_gw4) |
775 | cfg->fc_gw_family = AF_INET; | |
4e902c57 | 776 | break; |
b6e9e5df | 777 | case RTA_VIA: |
d1566268 DA |
778 | has_via = true; |
779 | err = fib_gw_from_via(cfg, attr, extack); | |
780 | if (err) | |
781 | goto errout; | |
782 | break; | |
4e902c57 TG |
783 | case RTA_PRIORITY: |
784 | cfg->fc_priority = nla_get_u32(attr); | |
785 | break; | |
786 | case RTA_PREFSRC: | |
17fb2c64 | 787 | cfg->fc_prefsrc = nla_get_be32(attr); |
4e902c57 TG |
788 | break; |
789 | case RTA_METRICS: | |
790 | cfg->fc_mx = nla_data(attr); | |
791 | cfg->fc_mx_len = nla_len(attr); | |
792 | break; | |
793 | case RTA_MULTIPATH: | |
9ed59592 | 794 | err = lwtunnel_valid_encap_type_attr(nla_data(attr), |
c255bd68 DA |
795 | nla_len(attr), |
796 | extack); | |
9ed59592 DA |
797 | if (err < 0) |
798 | goto errout; | |
4e902c57 TG |
799 | cfg->fc_mp = nla_data(attr); |
800 | cfg->fc_mp_len = nla_len(attr); | |
801 | break; | |
802 | case RTA_FLOW: | |
803 | cfg->fc_flow = nla_get_u32(attr); | |
804 | break; | |
4e902c57 TG |
805 | case RTA_TABLE: |
806 | cfg->fc_table = nla_get_u32(attr); | |
807 | break; | |
571e7226 RP |
808 | case RTA_ENCAP: |
809 | cfg->fc_encap = attr; | |
810 | break; | |
811 | case RTA_ENCAP_TYPE: | |
812 | cfg->fc_encap_type = nla_get_u16(attr); | |
c255bd68 DA |
813 | err = lwtunnel_valid_encap_type(cfg->fc_encap_type, |
814 | extack); | |
9ed59592 DA |
815 | if (err < 0) |
816 | goto errout; | |
571e7226 | 817 | break; |
493ced1a DA |
818 | case RTA_NH_ID: |
819 | cfg->fc_nh_id = nla_get_u32(attr); | |
820 | break; | |
821 | } | |
822 | } | |
823 | ||
824 | if (cfg->fc_nh_id) { | |
825 | if (cfg->fc_oif || cfg->fc_gw_family || | |
826 | cfg->fc_encap || cfg->fc_mp) { | |
827 | NL_SET_ERR_MSG(extack, | |
828 | "Nexthop specification and nexthop id are mutually exclusive"); | |
829 | return -EINVAL; | |
1da177e4 LT |
830 | } |
831 | } | |
4e902c57 | 832 | |
d1566268 DA |
833 | if (has_gw && has_via) { |
834 | NL_SET_ERR_MSG(extack, | |
835 | "Nexthop configuration can not contain both GATEWAY and VIA"); | |
836 | goto errout; | |
837 | } | |
838 | ||
1da177e4 | 839 | return 0; |
4e902c57 TG |
840 | errout: |
841 | return err; | |
1da177e4 LT |
842 | } |
843 | ||
c21ef3e3 DA |
844 | static int inet_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, |
845 | struct netlink_ext_ack *extack) | |
1da177e4 | 846 | { |
3b1e0a65 | 847 | struct net *net = sock_net(skb->sk); |
4e902c57 TG |
848 | struct fib_config cfg; |
849 | struct fib_table *tb; | |
850 | int err; | |
1da177e4 | 851 | |
6d8422a1 | 852 | err = rtm_to_fib_config(net, skb, nlh, &cfg, extack); |
4e902c57 TG |
853 | if (err < 0) |
854 | goto errout; | |
1da177e4 | 855 | |
493ced1a DA |
856 | if (cfg.fc_nh_id && !nexthop_find_by_id(net, cfg.fc_nh_id)) { |
857 | NL_SET_ERR_MSG(extack, "Nexthop id does not exist"); | |
858 | err = -EINVAL; | |
859 | goto errout; | |
860 | } | |
861 | ||
8ad4942c | 862 | tb = fib_get_table(net, cfg.fc_table); |
51456b29 | 863 | if (!tb) { |
c3ab2b4e | 864 | NL_SET_ERR_MSG(extack, "FIB table does not exist"); |
4e902c57 TG |
865 | err = -ESRCH; |
866 | goto errout; | |
867 | } | |
868 | ||
78055998 | 869 | err = fib_table_delete(net, tb, &cfg, extack); |
4e902c57 TG |
870 | errout: |
871 | return err; | |
1da177e4 LT |
872 | } |
873 | ||
c21ef3e3 DA |
874 | static int inet_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, |
875 | struct netlink_ext_ack *extack) | |
1da177e4 | 876 | { |
3b1e0a65 | 877 | struct net *net = sock_net(skb->sk); |
4e902c57 TG |
878 | struct fib_config cfg; |
879 | struct fib_table *tb; | |
880 | int err; | |
1da177e4 | 881 | |
6d8422a1 | 882 | err = rtm_to_fib_config(net, skb, nlh, &cfg, extack); |
4e902c57 TG |
883 | if (err < 0) |
884 | goto errout; | |
1da177e4 | 885 | |
226b0b4a | 886 | tb = fib_new_table(net, cfg.fc_table); |
51456b29 | 887 | if (!tb) { |
4e902c57 TG |
888 | err = -ENOBUFS; |
889 | goto errout; | |
890 | } | |
891 | ||
6d8422a1 | 892 | err = fib_table_insert(net, tb, &cfg, extack); |
6e617de8 PA |
893 | if (!err && cfg.fc_type == RTN_LOCAL) |
894 | net->ipv4.fib_has_custom_local_routes = true; | |
4e902c57 TG |
895 | errout: |
896 | return err; | |
1da177e4 LT |
897 | } |
898 | ||
4724676d DA |
899 | int ip_valid_fib_dump_req(struct net *net, const struct nlmsghdr *nlh, |
900 | struct fib_dump_filter *filter, | |
effe6792 | 901 | struct netlink_callback *cb) |
e8ba330a | 902 | { |
effe6792 DA |
903 | struct netlink_ext_ack *extack = cb->extack; |
904 | struct nlattr *tb[RTA_MAX + 1]; | |
e8ba330a | 905 | struct rtmsg *rtm; |
effe6792 DA |
906 | int err, i; |
907 | ||
908 | ASSERT_RTNL(); | |
e8ba330a DA |
909 | |
910 | if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*rtm))) { | |
911 | NL_SET_ERR_MSG(extack, "Invalid header for FIB dump request"); | |
912 | return -EINVAL; | |
913 | } | |
914 | ||
915 | rtm = nlmsg_data(nlh); | |
916 | if (rtm->rtm_dst_len || rtm->rtm_src_len || rtm->rtm_tos || | |
effe6792 | 917 | rtm->rtm_scope) { |
e8ba330a DA |
918 | NL_SET_ERR_MSG(extack, "Invalid values in header for FIB dump request"); |
919 | return -EINVAL; | |
920 | } | |
564c91f7 | 921 | |
e8ba330a DA |
922 | if (rtm->rtm_flags & ~(RTM_F_CLONED | RTM_F_PREFIX)) { |
923 | NL_SET_ERR_MSG(extack, "Invalid flags for FIB dump request"); | |
924 | return -EINVAL; | |
925 | } | |
564c91f7 SB |
926 | if (rtm->rtm_flags & RTM_F_CLONED) |
927 | filter->dump_routes = false; | |
928 | else | |
929 | filter->dump_exceptions = false; | |
e8ba330a | 930 | |
ae677bbb | 931 | filter->dump_all_families = (rtm->rtm_family == AF_UNSPEC); |
effe6792 DA |
932 | filter->flags = rtm->rtm_flags; |
933 | filter->protocol = rtm->rtm_protocol; | |
934 | filter->rt_type = rtm->rtm_type; | |
935 | filter->table_id = rtm->rtm_table; | |
936 | ||
8cb08174 JB |
937 | err = nlmsg_parse_deprecated_strict(nlh, sizeof(*rtm), tb, RTA_MAX, |
938 | rtm_ipv4_policy, extack); | |
effe6792 DA |
939 | if (err < 0) |
940 | return err; | |
941 | ||
942 | for (i = 0; i <= RTA_MAX; ++i) { | |
943 | int ifindex; | |
944 | ||
945 | if (!tb[i]) | |
946 | continue; | |
947 | ||
948 | switch (i) { | |
949 | case RTA_TABLE: | |
950 | filter->table_id = nla_get_u32(tb[i]); | |
951 | break; | |
952 | case RTA_OIF: | |
953 | ifindex = nla_get_u32(tb[i]); | |
954 | filter->dev = __dev_get_by_index(net, ifindex); | |
955 | if (!filter->dev) | |
956 | return -ENODEV; | |
957 | break; | |
958 | default: | |
959 | NL_SET_ERR_MSG(extack, "Unsupported attribute in dump request"); | |
960 | return -EINVAL; | |
961 | } | |
962 | } | |
963 | ||
964 | if (filter->flags || filter->protocol || filter->rt_type || | |
965 | filter->table_id || filter->dev) { | |
966 | filter->filter_set = 1; | |
967 | cb->answer_flags = NLM_F_DUMP_FILTERED; | |
e8ba330a DA |
968 | } |
969 | ||
970 | return 0; | |
971 | } | |
972 | EXPORT_SYMBOL_GPL(ip_valid_fib_dump_req); | |
973 | ||
63f3444f | 974 | static int inet_dump_fib(struct sk_buff *skb, struct netlink_callback *cb) |
1da177e4 | 975 | { |
564c91f7 SB |
976 | struct fib_dump_filter filter = { .dump_routes = true, |
977 | .dump_exceptions = true }; | |
e8ba330a | 978 | const struct nlmsghdr *nlh = cb->nlh; |
3b1e0a65 | 979 | struct net *net = sock_net(skb->sk); |
1af5a8c4 PM |
980 | unsigned int h, s_h; |
981 | unsigned int e = 0, s_e; | |
1da177e4 | 982 | struct fib_table *tb; |
e4aef8ae | 983 | struct hlist_head *head; |
f6c5775f | 984 | int dumped = 0, err; |
1da177e4 | 985 | |
e8ba330a | 986 | if (cb->strict_check) { |
effe6792 | 987 | err = ip_valid_fib_dump_req(net, nlh, &filter, cb); |
e8ba330a DA |
988 | if (err < 0) |
989 | return err; | |
e4e92fb1 DA |
990 | } else if (nlmsg_len(nlh) >= sizeof(struct rtmsg)) { |
991 | struct rtmsg *rtm = nlmsg_data(nlh); | |
992 | ||
993 | filter.flags = rtm->rtm_flags & (RTM_F_PREFIX | RTM_F_CLONED); | |
e8ba330a DA |
994 | } |
995 | ||
b597ca6e SB |
996 | /* ipv4 does not use prefix flag */ |
997 | if (filter.flags & RTM_F_PREFIX) | |
0b8c7f6f | 998 | return skb->len; |
1da177e4 | 999 | |
18a8021a DA |
1000 | if (filter.table_id) { |
1001 | tb = fib_get_table(net, filter.table_id); | |
1002 | if (!tb) { | |
ae677bbb DA |
1003 | if (filter.dump_all_families) |
1004 | return skb->len; | |
1005 | ||
18a8021a DA |
1006 | NL_SET_ERR_MSG(cb->extack, "ipv4: FIB table does not exist"); |
1007 | return -ENOENT; | |
1008 | } | |
1009 | ||
1010 | err = fib_table_dump(tb, skb, cb, &filter); | |
1011 | return skb->len ? : err; | |
1012 | } | |
1013 | ||
1af5a8c4 PM |
1014 | s_h = cb->args[0]; |
1015 | s_e = cb->args[1]; | |
1016 | ||
a7e53531 AD |
1017 | rcu_read_lock(); |
1018 | ||
1af5a8c4 PM |
1019 | for (h = s_h; h < FIB_TABLE_HASHSZ; h++, s_e = 0) { |
1020 | e = 0; | |
e4aef8ae | 1021 | head = &net->ipv4.fib_table_hash[h]; |
a7e53531 | 1022 | hlist_for_each_entry_rcu(tb, head, tb_hlist) { |
1af5a8c4 PM |
1023 | if (e < s_e) |
1024 | goto next; | |
1025 | if (dumped) | |
1026 | memset(&cb->args[2], 0, sizeof(cb->args) - | |
e905a9ed | 1027 | 2 * sizeof(cb->args[0])); |
18a8021a | 1028 | err = fib_table_dump(tb, skb, cb, &filter); |
f6c5775f DA |
1029 | if (err < 0) { |
1030 | if (likely(skb->len)) | |
1031 | goto out; | |
1032 | ||
1033 | goto out_err; | |
1034 | } | |
1af5a8c4 PM |
1035 | dumped = 1; |
1036 | next: | |
1037 | e++; | |
1038 | } | |
1da177e4 | 1039 | } |
1af5a8c4 | 1040 | out: |
f6c5775f DA |
1041 | err = skb->len; |
1042 | out_err: | |
a7e53531 AD |
1043 | rcu_read_unlock(); |
1044 | ||
1af5a8c4 PM |
1045 | cb->args[1] = e; |
1046 | cb->args[0] = h; | |
1da177e4 | 1047 | |
f6c5775f | 1048 | return err; |
1da177e4 LT |
1049 | } |
1050 | ||
1051 | /* Prepare and feed intra-kernel routing request. | |
6a31d2a9 ED |
1052 | * Really, it should be netlink message, but :-( netlink |
1053 | * can be not configured, so that we feed it directly | |
1054 | * to fib engine. It is legal, because all events occur | |
1055 | * only when netlink is already locked. | |
1da177e4 | 1056 | */ |
af4d768a DA |
1057 | static void fib_magic(int cmd, int type, __be32 dst, int dst_len, |
1058 | struct in_ifaddr *ifa, u32 rt_priority) | |
1da177e4 | 1059 | { |
c346dca1 | 1060 | struct net *net = dev_net(ifa->ifa_dev->dev); |
3236b004 | 1061 | u32 tb_id = l3mdev_fib_table(ifa->ifa_dev->dev); |
4e902c57 TG |
1062 | struct fib_table *tb; |
1063 | struct fib_config cfg = { | |
1064 | .fc_protocol = RTPROT_KERNEL, | |
1065 | .fc_type = type, | |
1066 | .fc_dst = dst, | |
1067 | .fc_dst_len = dst_len, | |
af4d768a | 1068 | .fc_priority = rt_priority, |
4e902c57 TG |
1069 | .fc_prefsrc = ifa->ifa_local, |
1070 | .fc_oif = ifa->ifa_dev->dev->ifindex, | |
1071 | .fc_nlflags = NLM_F_CREATE | NLM_F_APPEND, | |
4d1169c1 | 1072 | .fc_nlinfo = { |
4b5d47d4 | 1073 | .nl_net = net, |
4d1169c1 | 1074 | }, |
4e902c57 | 1075 | }; |
1da177e4 | 1076 | |
021dd3b8 DA |
1077 | if (!tb_id) |
1078 | tb_id = (type == RTN_UNICAST) ? RT_TABLE_MAIN : RT_TABLE_LOCAL; | |
1da177e4 | 1079 | |
021dd3b8 | 1080 | tb = fib_new_table(net, tb_id); |
51456b29 | 1081 | if (!tb) |
1da177e4 LT |
1082 | return; |
1083 | ||
4e902c57 | 1084 | cfg.fc_table = tb->tb_id; |
1da177e4 | 1085 | |
4e902c57 TG |
1086 | if (type != RTN_LOCAL) |
1087 | cfg.fc_scope = RT_SCOPE_LINK; | |
1088 | else | |
1089 | cfg.fc_scope = RT_SCOPE_HOST; | |
1da177e4 LT |
1090 | |
1091 | if (cmd == RTM_NEWROUTE) | |
6d8422a1 | 1092 | fib_table_insert(net, tb, &cfg, NULL); |
1da177e4 | 1093 | else |
78055998 | 1094 | fib_table_delete(net, tb, &cfg, NULL); |
1da177e4 LT |
1095 | } |
1096 | ||
0ff60a45 | 1097 | void fib_add_ifaddr(struct in_ifaddr *ifa) |
1da177e4 LT |
1098 | { |
1099 | struct in_device *in_dev = ifa->ifa_dev; | |
1100 | struct net_device *dev = in_dev->dev; | |
1101 | struct in_ifaddr *prim = ifa; | |
a144ea4b AV |
1102 | __be32 mask = ifa->ifa_mask; |
1103 | __be32 addr = ifa->ifa_local; | |
6a31d2a9 | 1104 | __be32 prefix = ifa->ifa_address & mask; |
1da177e4 | 1105 | |
6a31d2a9 | 1106 | if (ifa->ifa_flags & IFA_F_SECONDARY) { |
1da177e4 | 1107 | prim = inet_ifa_byprefix(in_dev, prefix, mask); |
51456b29 | 1108 | if (!prim) { |
058bd4d2 | 1109 | pr_warn("%s: bug: prim == NULL\n", __func__); |
1da177e4 LT |
1110 | return; |
1111 | } | |
1112 | } | |
1113 | ||
af4d768a | 1114 | fib_magic(RTM_NEWROUTE, RTN_LOCAL, addr, 32, prim, 0); |
1da177e4 | 1115 | |
6a31d2a9 | 1116 | if (!(dev->flags & IFF_UP)) |
1da177e4 LT |
1117 | return; |
1118 | ||
1119 | /* Add broadcast address, if it is explicitly assigned. */ | |
a144ea4b | 1120 | if (ifa->ifa_broadcast && ifa->ifa_broadcast != htonl(0xFFFFFFFF)) |
af4d768a DA |
1121 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, |
1122 | prim, 0); | |
1da177e4 | 1123 | |
6a31d2a9 | 1124 | if (!ipv4_is_zeronet(prefix) && !(ifa->ifa_flags & IFA_F_SECONDARY) && |
1da177e4 | 1125 | (prefix != addr || ifa->ifa_prefixlen < 32)) { |
7b131180 PA |
1126 | if (!(ifa->ifa_flags & IFA_F_NOPREFIXROUTE)) |
1127 | fib_magic(RTM_NEWROUTE, | |
1128 | dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST, | |
af4d768a DA |
1129 | prefix, ifa->ifa_prefixlen, prim, |
1130 | ifa->ifa_rt_priority); | |
1da177e4 LT |
1131 | |
1132 | /* Add network specific broadcasts, when it takes a sense */ | |
1133 | if (ifa->ifa_prefixlen < 31) { | |
af4d768a DA |
1134 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix, 32, |
1135 | prim, 0); | |
6a31d2a9 | 1136 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix | ~mask, |
af4d768a | 1137 | 32, prim, 0); |
1da177e4 LT |
1138 | } |
1139 | } | |
1140 | } | |
1141 | ||
af4d768a DA |
1142 | void fib_modify_prefix_metric(struct in_ifaddr *ifa, u32 new_metric) |
1143 | { | |
1144 | __be32 prefix = ifa->ifa_address & ifa->ifa_mask; | |
1145 | struct in_device *in_dev = ifa->ifa_dev; | |
1146 | struct net_device *dev = in_dev->dev; | |
1147 | ||
1148 | if (!(dev->flags & IFF_UP) || | |
1149 | ifa->ifa_flags & (IFA_F_SECONDARY | IFA_F_NOPREFIXROUTE) || | |
1150 | ipv4_is_zeronet(prefix) || | |
0b834ba0 | 1151 | (prefix == ifa->ifa_local && ifa->ifa_prefixlen == 32)) |
af4d768a DA |
1152 | return; |
1153 | ||
1154 | /* add the new */ | |
1155 | fib_magic(RTM_NEWROUTE, | |
1156 | dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST, | |
1157 | prefix, ifa->ifa_prefixlen, ifa, new_metric); | |
1158 | ||
1159 | /* delete the old */ | |
1160 | fib_magic(RTM_DELROUTE, | |
1161 | dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST, | |
1162 | prefix, ifa->ifa_prefixlen, ifa, ifa->ifa_rt_priority); | |
1163 | } | |
1164 | ||
e6abbaa2 JA |
1165 | /* Delete primary or secondary address. |
1166 | * Optionally, on secondary address promotion consider the addresses | |
1167 | * from subnet iprim as deleted, even if they are in device list. | |
1168 | * In this case the secondary ifa can be in device list. | |
1169 | */ | |
1170 | void fib_del_ifaddr(struct in_ifaddr *ifa, struct in_ifaddr *iprim) | |
1da177e4 LT |
1171 | { |
1172 | struct in_device *in_dev = ifa->ifa_dev; | |
1173 | struct net_device *dev = in_dev->dev; | |
1174 | struct in_ifaddr *ifa1; | |
e6abbaa2 | 1175 | struct in_ifaddr *prim = ifa, *prim1 = NULL; |
6a31d2a9 ED |
1176 | __be32 brd = ifa->ifa_address | ~ifa->ifa_mask; |
1177 | __be32 any = ifa->ifa_address & ifa->ifa_mask; | |
1da177e4 LT |
1178 | #define LOCAL_OK 1 |
1179 | #define BRD_OK 2 | |
1180 | #define BRD0_OK 4 | |
1181 | #define BRD1_OK 8 | |
95c96174 | 1182 | unsigned int ok = 0; |
e6abbaa2 JA |
1183 | int subnet = 0; /* Primary network */ |
1184 | int gone = 1; /* Address is missing */ | |
1185 | int same_prefsrc = 0; /* Another primary with same IP */ | |
1da177e4 | 1186 | |
e6abbaa2 | 1187 | if (ifa->ifa_flags & IFA_F_SECONDARY) { |
1da177e4 | 1188 | prim = inet_ifa_byprefix(in_dev, any, ifa->ifa_mask); |
51456b29 | 1189 | if (!prim) { |
391a2033 PA |
1190 | /* if the device has been deleted, we don't perform |
1191 | * address promotion | |
1192 | */ | |
1193 | if (!in_dev->dead) | |
1194 | pr_warn("%s: bug: prim == NULL\n", __func__); | |
1da177e4 LT |
1195 | return; |
1196 | } | |
e6abbaa2 | 1197 | if (iprim && iprim != prim) { |
058bd4d2 | 1198 | pr_warn("%s: bug: iprim != prim\n", __func__); |
e6abbaa2 JA |
1199 | return; |
1200 | } | |
1201 | } else if (!ipv4_is_zeronet(any) && | |
1202 | (any != ifa->ifa_local || ifa->ifa_prefixlen < 32)) { | |
7b131180 PA |
1203 | if (!(ifa->ifa_flags & IFA_F_NOPREFIXROUTE)) |
1204 | fib_magic(RTM_DELROUTE, | |
1205 | dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST, | |
af4d768a | 1206 | any, ifa->ifa_prefixlen, prim, 0); |
e6abbaa2 | 1207 | subnet = 1; |
1da177e4 LT |
1208 | } |
1209 | ||
fbd40ea0 DM |
1210 | if (in_dev->dead) |
1211 | goto no_promotions; | |
1212 | ||
1da177e4 | 1213 | /* Deletion is more complicated than add. |
6a31d2a9 ED |
1214 | * We should take care of not to delete too much :-) |
1215 | * | |
1216 | * Scan address list to be sure that addresses are really gone. | |
1da177e4 | 1217 | */ |
cd5a411d FW |
1218 | rcu_read_lock(); |
1219 | in_dev_for_each_ifa_rcu(ifa1, in_dev) { | |
e6abbaa2 JA |
1220 | if (ifa1 == ifa) { |
1221 | /* promotion, keep the IP */ | |
1222 | gone = 0; | |
1223 | continue; | |
1224 | } | |
1225 | /* Ignore IFAs from our subnet */ | |
1226 | if (iprim && ifa1->ifa_mask == iprim->ifa_mask && | |
1227 | inet_ifa_match(ifa1->ifa_address, iprim)) | |
1228 | continue; | |
1229 | ||
1230 | /* Ignore ifa1 if it uses different primary IP (prefsrc) */ | |
1231 | if (ifa1->ifa_flags & IFA_F_SECONDARY) { | |
1232 | /* Another address from our subnet? */ | |
1233 | if (ifa1->ifa_mask == prim->ifa_mask && | |
1234 | inet_ifa_match(ifa1->ifa_address, prim)) | |
1235 | prim1 = prim; | |
1236 | else { | |
1237 | /* We reached the secondaries, so | |
1238 | * same_prefsrc should be determined. | |
1239 | */ | |
1240 | if (!same_prefsrc) | |
1241 | continue; | |
1242 | /* Search new prim1 if ifa1 is not | |
1243 | * using the current prim1 | |
1244 | */ | |
1245 | if (!prim1 || | |
1246 | ifa1->ifa_mask != prim1->ifa_mask || | |
1247 | !inet_ifa_match(ifa1->ifa_address, prim1)) | |
1248 | prim1 = inet_ifa_byprefix(in_dev, | |
1249 | ifa1->ifa_address, | |
1250 | ifa1->ifa_mask); | |
1251 | if (!prim1) | |
1252 | continue; | |
1253 | if (prim1->ifa_local != prim->ifa_local) | |
1254 | continue; | |
1255 | } | |
1256 | } else { | |
1257 | if (prim->ifa_local != ifa1->ifa_local) | |
1258 | continue; | |
1259 | prim1 = ifa1; | |
1260 | if (prim != prim1) | |
1261 | same_prefsrc = 1; | |
1262 | } | |
1da177e4 LT |
1263 | if (ifa->ifa_local == ifa1->ifa_local) |
1264 | ok |= LOCAL_OK; | |
1265 | if (ifa->ifa_broadcast == ifa1->ifa_broadcast) | |
1266 | ok |= BRD_OK; | |
1267 | if (brd == ifa1->ifa_broadcast) | |
1268 | ok |= BRD1_OK; | |
1269 | if (any == ifa1->ifa_broadcast) | |
1270 | ok |= BRD0_OK; | |
e6abbaa2 JA |
1271 | /* primary has network specific broadcasts */ |
1272 | if (prim1 == ifa1 && ifa1->ifa_prefixlen < 31) { | |
1273 | __be32 brd1 = ifa1->ifa_address | ~ifa1->ifa_mask; | |
1274 | __be32 any1 = ifa1->ifa_address & ifa1->ifa_mask; | |
1275 | ||
1276 | if (!ipv4_is_zeronet(any1)) { | |
1277 | if (ifa->ifa_broadcast == brd1 || | |
1278 | ifa->ifa_broadcast == any1) | |
1279 | ok |= BRD_OK; | |
1280 | if (brd == brd1 || brd == any1) | |
1281 | ok |= BRD1_OK; | |
1282 | if (any == brd1 || any == any1) | |
1283 | ok |= BRD0_OK; | |
1284 | } | |
1285 | } | |
1da177e4 | 1286 | } |
cd5a411d | 1287 | rcu_read_unlock(); |
1da177e4 | 1288 | |
fbd40ea0 | 1289 | no_promotions: |
6a31d2a9 | 1290 | if (!(ok & BRD_OK)) |
af4d768a DA |
1291 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, |
1292 | prim, 0); | |
e6abbaa2 JA |
1293 | if (subnet && ifa->ifa_prefixlen < 31) { |
1294 | if (!(ok & BRD1_OK)) | |
af4d768a DA |
1295 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, brd, 32, |
1296 | prim, 0); | |
e6abbaa2 | 1297 | if (!(ok & BRD0_OK)) |
af4d768a DA |
1298 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, any, 32, |
1299 | prim, 0); | |
e6abbaa2 | 1300 | } |
6a31d2a9 | 1301 | if (!(ok & LOCAL_OK)) { |
30bbaa19 DA |
1302 | unsigned int addr_type; |
1303 | ||
af4d768a | 1304 | fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 32, prim, 0); |
1da177e4 LT |
1305 | |
1306 | /* Check, that this local address finally disappeared. */ | |
30bbaa19 DA |
1307 | addr_type = inet_addr_type_dev_table(dev_net(dev), dev, |
1308 | ifa->ifa_local); | |
1309 | if (gone && addr_type != RTN_LOCAL) { | |
1da177e4 | 1310 | /* And the last, but not the least thing. |
6a31d2a9 ED |
1311 | * We must flush stray FIB entries. |
1312 | * | |
1313 | * First of all, we scan fib_info list searching | |
1314 | * for stray nexthop entries, then ignite fib_flush. | |
1315 | */ | |
5a56a0b3 | 1316 | if (fib_sync_down_addr(dev, ifa->ifa_local)) |
c346dca1 | 1317 | fib_flush(dev_net(dev)); |
1da177e4 LT |
1318 | } |
1319 | } | |
1320 | #undef LOCAL_OK | |
1321 | #undef BRD_OK | |
1322 | #undef BRD0_OK | |
1323 | #undef BRD1_OK | |
1324 | } | |
1325 | ||
345e9b54 | 1326 | static void nl_fib_lookup(struct net *net, struct fib_result_nl *frn) |
246955fe | 1327 | { |
e905a9ed | 1328 | |
246955fe | 1329 | struct fib_result res; |
9ade2286 DM |
1330 | struct flowi4 fl4 = { |
1331 | .flowi4_mark = frn->fl_mark, | |
1332 | .daddr = frn->fl_addr, | |
1333 | .flowi4_tos = frn->fl_tos, | |
1334 | .flowi4_scope = frn->fl_scope, | |
6a31d2a9 | 1335 | }; |
345e9b54 AD |
1336 | struct fib_table *tb; |
1337 | ||
1338 | rcu_read_lock(); | |
1339 | ||
1340 | tb = fib_get_table(net, frn->tb_id_in); | |
1194ed0a AK |
1341 | |
1342 | frn->err = -ENOENT; | |
246955fe RO |
1343 | if (tb) { |
1344 | local_bh_disable(); | |
1345 | ||
1346 | frn->tb_id = tb->tb_id; | |
9ade2286 | 1347 | frn->err = fib_table_lookup(tb, &fl4, &res, FIB_LOOKUP_NOREF); |
246955fe RO |
1348 | |
1349 | if (!frn->err) { | |
1350 | frn->prefixlen = res.prefixlen; | |
1351 | frn->nh_sel = res.nh_sel; | |
1352 | frn->type = res.type; | |
1353 | frn->scope = res.scope; | |
1354 | } | |
1355 | local_bh_enable(); | |
1356 | } | |
345e9b54 AD |
1357 | |
1358 | rcu_read_unlock(); | |
246955fe RO |
1359 | } |
1360 | ||
28f7b036 | 1361 | static void nl_fib_input(struct sk_buff *skb) |
246955fe | 1362 | { |
6bd48fcf | 1363 | struct net *net; |
246955fe | 1364 | struct fib_result_nl *frn; |
28f7b036 | 1365 | struct nlmsghdr *nlh; |
15e47304 | 1366 | u32 portid; |
1194ed0a | 1367 | |
3b1e0a65 | 1368 | net = sock_net(skb->sk); |
b529ccf2 | 1369 | nlh = nlmsg_hdr(skb); |
c64c0b3c ED |
1370 | if (skb->len < nlmsg_total_size(sizeof(*frn)) || |
1371 | skb->len < nlh->nlmsg_len || | |
573ce260 | 1372 | nlmsg_len(nlh) < sizeof(*frn)) |
ea86575e | 1373 | return; |
d883a036 | 1374 | |
3a36515f | 1375 | skb = netlink_skb_clone(skb, GFP_KERNEL); |
51456b29 | 1376 | if (!skb) |
d883a036 DL |
1377 | return; |
1378 | nlh = nlmsg_hdr(skb); | |
e905a9ed | 1379 | |
573ce260 | 1380 | frn = (struct fib_result_nl *) nlmsg_data(nlh); |
345e9b54 | 1381 | nl_fib_lookup(net, frn); |
e905a9ed | 1382 | |
28a28283 | 1383 | portid = NETLINK_CB(skb).portid; /* netlink portid */ |
15e47304 | 1384 | NETLINK_CB(skb).portid = 0; /* from kernel */ |
ac6d439d | 1385 | NETLINK_CB(skb).dst_group = 0; /* unicast */ |
15e47304 | 1386 | netlink_unicast(net->ipv4.fibnl, skb, portid, MSG_DONTWAIT); |
e905a9ed | 1387 | } |
246955fe | 1388 | |
2c8c1e72 | 1389 | static int __net_init nl_fib_lookup_init(struct net *net) |
246955fe | 1390 | { |
6bd48fcf | 1391 | struct sock *sk; |
a31f2d17 PNA |
1392 | struct netlink_kernel_cfg cfg = { |
1393 | .input = nl_fib_input, | |
1394 | }; | |
1395 | ||
9f00d977 | 1396 | sk = netlink_kernel_create(net, NETLINK_FIB_LOOKUP, &cfg); |
51456b29 | 1397 | if (!sk) |
7b1a74fd | 1398 | return -EAFNOSUPPORT; |
6bd48fcf | 1399 | net->ipv4.fibnl = sk; |
7b1a74fd DL |
1400 | return 0; |
1401 | } | |
1402 | ||
1403 | static void nl_fib_lookup_exit(struct net *net) | |
1404 | { | |
b7c6ba6e | 1405 | netlink_kernel_release(net->ipv4.fibnl); |
775516bf | 1406 | net->ipv4.fibnl = NULL; |
246955fe RO |
1407 | } |
1408 | ||
4f823def JA |
1409 | static void fib_disable_ip(struct net_device *dev, unsigned long event, |
1410 | bool force) | |
1da177e4 | 1411 | { |
4f823def | 1412 | if (fib_sync_down_dev(dev, event, force)) |
c346dca1 | 1413 | fib_flush(dev_net(dev)); |
06b4fc52 GF |
1414 | else |
1415 | rt_cache_flush(dev_net(dev)); | |
1da177e4 LT |
1416 | arp_ifdown(dev); |
1417 | } | |
1418 | ||
1419 | static int fib_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1420 | { | |
6ed2533e | 1421 | struct in_ifaddr *ifa = (struct in_ifaddr *)ptr; |
76e6ebfb | 1422 | struct net_device *dev = ifa->ifa_dev->dev; |
436c3b66 | 1423 | struct net *net = dev_net(dev); |
1da177e4 LT |
1424 | |
1425 | switch (event) { | |
1426 | case NETDEV_UP: | |
1427 | fib_add_ifaddr(ifa); | |
1428 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
8a3d0316 | 1429 | fib_sync_up(dev, RTNH_F_DEAD); |
1da177e4 | 1430 | #endif |
436c3b66 | 1431 | atomic_inc(&net->ipv4.dev_addr_genid); |
4ccfe6d4 | 1432 | rt_cache_flush(dev_net(dev)); |
1da177e4 LT |
1433 | break; |
1434 | case NETDEV_DOWN: | |
e6abbaa2 | 1435 | fib_del_ifaddr(ifa, NULL); |
436c3b66 | 1436 | atomic_inc(&net->ipv4.dev_addr_genid); |
51456b29 | 1437 | if (!ifa->ifa_dev->ifa_list) { |
1da177e4 | 1438 | /* Last address was deleted from this interface. |
6a31d2a9 | 1439 | * Disable IP. |
1da177e4 | 1440 | */ |
4f823def | 1441 | fib_disable_ip(dev, event, true); |
1da177e4 | 1442 | } else { |
4ccfe6d4 | 1443 | rt_cache_flush(dev_net(dev)); |
1da177e4 LT |
1444 | } |
1445 | break; | |
1446 | } | |
1447 | return NOTIFY_DONE; | |
1448 | } | |
1449 | ||
1450 | static int fib_netdev_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1451 | { | |
351638e7 | 1452 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
af7d6cce SD |
1453 | struct netdev_notifier_changeupper_info *upper_info = ptr; |
1454 | struct netdev_notifier_info_ext *info_ext = ptr; | |
0115e8e3 | 1455 | struct in_device *in_dev; |
436c3b66 | 1456 | struct net *net = dev_net(dev); |
cd5a411d | 1457 | struct in_ifaddr *ifa; |
8a3d0316 | 1458 | unsigned int flags; |
1da177e4 LT |
1459 | |
1460 | if (event == NETDEV_UNREGISTER) { | |
4f823def | 1461 | fib_disable_ip(dev, event, true); |
caacf05e | 1462 | rt_flush_dev(dev); |
1da177e4 LT |
1463 | return NOTIFY_DONE; |
1464 | } | |
1465 | ||
0115e8e3 | 1466 | in_dev = __in_dev_get_rtnl(dev); |
a0065f26 OH |
1467 | if (!in_dev) |
1468 | return NOTIFY_DONE; | |
0115e8e3 | 1469 | |
1da177e4 LT |
1470 | switch (event) { |
1471 | case NETDEV_UP: | |
cd5a411d | 1472 | in_dev_for_each_ifa_rtnl(ifa, in_dev) { |
1da177e4 | 1473 | fib_add_ifaddr(ifa); |
cd5a411d | 1474 | } |
1da177e4 | 1475 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
8a3d0316 | 1476 | fib_sync_up(dev, RTNH_F_DEAD); |
1da177e4 | 1477 | #endif |
436c3b66 | 1478 | atomic_inc(&net->ipv4.dev_addr_genid); |
4ccfe6d4 | 1479 | rt_cache_flush(net); |
1da177e4 LT |
1480 | break; |
1481 | case NETDEV_DOWN: | |
4f823def | 1482 | fib_disable_ip(dev, event, false); |
1da177e4 | 1483 | break; |
1da177e4 | 1484 | case NETDEV_CHANGE: |
8a3d0316 AG |
1485 | flags = dev_get_flags(dev); |
1486 | if (flags & (IFF_RUNNING | IFF_LOWER_UP)) | |
1487 | fib_sync_up(dev, RTNH_F_LINKDOWN); | |
1488 | else | |
4f823def | 1489 | fib_sync_down_dev(dev, event, false); |
af7d6cce SD |
1490 | rt_cache_flush(net); |
1491 | break; | |
8a3d0316 | 1492 | case NETDEV_CHANGEMTU: |
af7d6cce | 1493 | fib_sync_mtu(dev, info_ext->ext.mtu); |
4ccfe6d4 | 1494 | rt_cache_flush(net); |
1da177e4 | 1495 | break; |
7f49e7a3 | 1496 | case NETDEV_CHANGEUPPER: |
af7d6cce | 1497 | upper_info = ptr; |
7f49e7a3 DA |
1498 | /* flush all routes if dev is linked to or unlinked from |
1499 | * an L3 master device (e.g., VRF) | |
1500 | */ | |
af7d6cce SD |
1501 | if (upper_info->upper_dev && |
1502 | netif_is_l3_master(upper_info->upper_dev)) | |
7f49e7a3 DA |
1503 | fib_disable_ip(dev, NETDEV_DOWN, true); |
1504 | break; | |
1da177e4 LT |
1505 | } |
1506 | return NOTIFY_DONE; | |
1507 | } | |
1508 | ||
1509 | static struct notifier_block fib_inetaddr_notifier = { | |
6ed2533e | 1510 | .notifier_call = fib_inetaddr_event, |
1da177e4 LT |
1511 | }; |
1512 | ||
1513 | static struct notifier_block fib_netdev_notifier = { | |
6ed2533e | 1514 | .notifier_call = fib_netdev_event, |
1da177e4 LT |
1515 | }; |
1516 | ||
7b1a74fd | 1517 | static int __net_init ip_fib_net_init(struct net *net) |
1da177e4 | 1518 | { |
dce5cbee | 1519 | int err; |
10da66f7 ED |
1520 | size_t size = sizeof(struct hlist_head) * FIB_TABLE_HASHSZ; |
1521 | ||
04b1d4e5 IS |
1522 | err = fib4_notifier_init(net); |
1523 | if (err) | |
1524 | return err; | |
cacaad11 | 1525 | |
10da66f7 ED |
1526 | /* Avoid false sharing : Use at least a full cache line */ |
1527 | size = max_t(size_t, size, L1_CACHE_BYTES); | |
1af5a8c4 | 1528 | |
10da66f7 | 1529 | net->ipv4.fib_table_hash = kzalloc(size, GFP_KERNEL); |
04b1d4e5 IS |
1530 | if (!net->ipv4.fib_table_hash) { |
1531 | err = -ENOMEM; | |
1532 | goto err_table_hash_alloc; | |
1533 | } | |
e4aef8ae | 1534 | |
dce5cbee DL |
1535 | err = fib4_rules_init(net); |
1536 | if (err < 0) | |
04b1d4e5 | 1537 | goto err_rules_init; |
dce5cbee DL |
1538 | return 0; |
1539 | ||
04b1d4e5 | 1540 | err_rules_init: |
dce5cbee | 1541 | kfree(net->ipv4.fib_table_hash); |
04b1d4e5 IS |
1542 | err_table_hash_alloc: |
1543 | fib4_notifier_exit(net); | |
dce5cbee | 1544 | return err; |
7b1a74fd | 1545 | } |
1da177e4 | 1546 | |
2c8c1e72 | 1547 | static void ip_fib_net_exit(struct net *net) |
7b1a74fd | 1548 | { |
b4681c28 | 1549 | int i; |
7b1a74fd | 1550 | |
6dede75b | 1551 | rtnl_lock(); |
6e47d6ca | 1552 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
6e47d6ca AD |
1553 | RCU_INIT_POINTER(net->ipv4.fib_main, NULL); |
1554 | RCU_INIT_POINTER(net->ipv4.fib_default, NULL); | |
1555 | #endif | |
b4681c28 IS |
1556 | /* Destroy the tables in reverse order to guarantee that the |
1557 | * local table, ID 255, is destroyed before the main table, ID | |
1558 | * 254. This is necessary as the local table may contain | |
1559 | * references to data contained in the main table. | |
1560 | */ | |
1561 | for (i = FIB_TABLE_HASHSZ - 1; i >= 0; i--) { | |
a7e53531 | 1562 | struct hlist_head *head = &net->ipv4.fib_table_hash[i]; |
b67bfe0d | 1563 | struct hlist_node *tmp; |
a7e53531 AD |
1564 | struct fib_table *tb; |
1565 | ||
b67bfe0d SL |
1566 | hlist_for_each_entry_safe(tb, tmp, head, tb_hlist) { |
1567 | hlist_del(&tb->tb_hlist); | |
f97f4dd8 | 1568 | fib_table_flush(net, tb, true); |
4aa2c466 | 1569 | fib_free_table(tb); |
7b1a74fd DL |
1570 | } |
1571 | } | |
ad88d051 AD |
1572 | |
1573 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
1574 | fib4_rules_exit(net); | |
1575 | #endif | |
e2666f84 | 1576 | rtnl_unlock(); |
e4aef8ae | 1577 | kfree(net->ipv4.fib_table_hash); |
04b1d4e5 | 1578 | fib4_notifier_exit(net); |
7b1a74fd DL |
1579 | } |
1580 | ||
1581 | static int __net_init fib_net_init(struct net *net) | |
1582 | { | |
1583 | int error; | |
1584 | ||
f4530fa5 DM |
1585 | #ifdef CONFIG_IP_ROUTE_CLASSID |
1586 | net->ipv4.fib_num_tclassid_users = 0; | |
1587 | #endif | |
7b1a74fd DL |
1588 | error = ip_fib_net_init(net); |
1589 | if (error < 0) | |
1590 | goto out; | |
1591 | error = nl_fib_lookup_init(net); | |
1592 | if (error < 0) | |
1593 | goto out_nlfl; | |
1594 | error = fib_proc_init(net); | |
1595 | if (error < 0) | |
1596 | goto out_proc; | |
1597 | out: | |
1598 | return error; | |
1599 | ||
1600 | out_proc: | |
1601 | nl_fib_lookup_exit(net); | |
1602 | out_nlfl: | |
1603 | ip_fib_net_exit(net); | |
1604 | goto out; | |
1605 | } | |
1606 | ||
1607 | static void __net_exit fib_net_exit(struct net *net) | |
1608 | { | |
1609 | fib_proc_exit(net); | |
1610 | nl_fib_lookup_exit(net); | |
1611 | ip_fib_net_exit(net); | |
1612 | } | |
1613 | ||
1614 | static struct pernet_operations fib_net_ops = { | |
1615 | .init = fib_net_init, | |
1616 | .exit = fib_net_exit, | |
1617 | }; | |
1618 | ||
1619 | void __init ip_fib_init(void) | |
1620 | { | |
8799a221 | 1621 | fib_trie_init(); |
7b1a74fd DL |
1622 | |
1623 | register_pernet_subsys(&fib_net_ops); | |
8799a221 | 1624 | |
7b1a74fd DL |
1625 | register_netdevice_notifier(&fib_netdev_notifier); |
1626 | register_inetaddr_notifier(&fib_inetaddr_notifier); | |
7f9b8052 | 1627 | |
b97bac64 FW |
1628 | rtnl_register(PF_INET, RTM_NEWROUTE, inet_rtm_newroute, NULL, 0); |
1629 | rtnl_register(PF_INET, RTM_DELROUTE, inet_rtm_delroute, NULL, 0); | |
1630 | rtnl_register(PF_INET, RTM_GETROUTE, NULL, inet_dump_fib, 0); | |
1da177e4 | 1631 | } |