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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> | |
63f3444f | 42 | #include <net/rtnetlink.h> |
990078af | 43 | #include <net/xfrm.h> |
385add90 | 44 | #include <net/l3mdev.h> |
9ed59592 | 45 | #include <net/lwtunnel.h> |
f6d3c192 | 46 | #include <trace/events/fib.h> |
1da177e4 | 47 | |
1da177e4 LT |
48 | #ifndef CONFIG_IP_MULTIPLE_TABLES |
49 | ||
7b1a74fd | 50 | static int __net_init fib4_rules_init(struct net *net) |
c3e9a353 | 51 | { |
93456b6d DL |
52 | struct fib_table *local_table, *main_table; |
53 | ||
0ddcf43d | 54 | main_table = fib_trie_table(RT_TABLE_MAIN, NULL); |
51456b29 | 55 | if (!main_table) |
61f0d861 | 56 | return -ENOMEM; |
dbb50165 | 57 | |
0ddcf43d | 58 | local_table = fib_trie_table(RT_TABLE_LOCAL, main_table); |
51456b29 | 59 | if (!local_table) |
61f0d861 | 60 | goto fail; |
0ddcf43d | 61 | |
93456b6d | 62 | hlist_add_head_rcu(&local_table->tb_hlist, |
e4aef8ae | 63 | &net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX]); |
93456b6d | 64 | hlist_add_head_rcu(&main_table->tb_hlist, |
e4aef8ae | 65 | &net->ipv4.fib_table_hash[TABLE_MAIN_INDEX]); |
dbb50165 DL |
66 | return 0; |
67 | ||
68 | fail: | |
61f0d861 | 69 | fib_free_table(main_table); |
dbb50165 | 70 | return -ENOMEM; |
c3e9a353 | 71 | } |
032a4802 PA |
72 | |
73 | static bool fib4_has_custom_rules(struct net *net) | |
74 | { | |
75 | return false; | |
76 | } | |
1af5a8c4 | 77 | #else |
1da177e4 | 78 | |
8ad4942c | 79 | struct fib_table *fib_new_table(struct net *net, u32 id) |
1da177e4 | 80 | { |
0ddcf43d | 81 | struct fib_table *tb, *alias = NULL; |
1af5a8c4 | 82 | unsigned int h; |
1da177e4 | 83 | |
1af5a8c4 PM |
84 | if (id == 0) |
85 | id = RT_TABLE_MAIN; | |
8ad4942c | 86 | tb = fib_get_table(net, id); |
1af5a8c4 PM |
87 | if (tb) |
88 | return tb; | |
7f9b8052 | 89 | |
5350d54f | 90 | if (id == RT_TABLE_LOCAL && !net->ipv4.fib_has_custom_rules) |
0ddcf43d AD |
91 | alias = fib_new_table(net, RT_TABLE_MAIN); |
92 | ||
93 | tb = fib_trie_table(id, alias); | |
1da177e4 LT |
94 | if (!tb) |
95 | return NULL; | |
f4530fa5 DM |
96 | |
97 | switch (id) { | |
f4530fa5 | 98 | case RT_TABLE_MAIN: |
a7e53531 | 99 | rcu_assign_pointer(net->ipv4.fib_main, tb); |
f4530fa5 | 100 | break; |
f4530fa5 | 101 | case RT_TABLE_DEFAULT: |
a7e53531 | 102 | rcu_assign_pointer(net->ipv4.fib_default, tb); |
f4530fa5 | 103 | break; |
f4530fa5 DM |
104 | default: |
105 | break; | |
106 | } | |
107 | ||
1af5a8c4 | 108 | h = id & (FIB_TABLE_HASHSZ - 1); |
e4aef8ae | 109 | hlist_add_head_rcu(&tb->tb_hlist, &net->ipv4.fib_table_hash[h]); |
1da177e4 LT |
110 | return tb; |
111 | } | |
b3b4663c | 112 | EXPORT_SYMBOL_GPL(fib_new_table); |
1da177e4 | 113 | |
345e9b54 | 114 | /* caller must hold either rtnl or rcu read lock */ |
8ad4942c | 115 | struct fib_table *fib_get_table(struct net *net, u32 id) |
1af5a8c4 PM |
116 | { |
117 | struct fib_table *tb; | |
e4aef8ae | 118 | struct hlist_head *head; |
1af5a8c4 | 119 | unsigned int h; |
1da177e4 | 120 | |
1af5a8c4 PM |
121 | if (id == 0) |
122 | id = RT_TABLE_MAIN; | |
123 | h = id & (FIB_TABLE_HASHSZ - 1); | |
e4aef8ae | 124 | |
e4aef8ae | 125 | head = &net->ipv4.fib_table_hash[h]; |
b67bfe0d | 126 | hlist_for_each_entry_rcu(tb, head, tb_hlist) { |
345e9b54 | 127 | if (tb->tb_id == id) |
1af5a8c4 | 128 | return tb; |
1af5a8c4 | 129 | } |
1af5a8c4 PM |
130 | return NULL; |
131 | } | |
032a4802 PA |
132 | |
133 | static bool fib4_has_custom_rules(struct net *net) | |
134 | { | |
135 | return net->ipv4.fib_has_custom_rules; | |
136 | } | |
1da177e4 LT |
137 | #endif /* CONFIG_IP_MULTIPLE_TABLES */ |
138 | ||
0ddcf43d AD |
139 | static void fib_replace_table(struct net *net, struct fib_table *old, |
140 | struct fib_table *new) | |
141 | { | |
142 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
143 | switch (new->tb_id) { | |
0ddcf43d AD |
144 | case RT_TABLE_MAIN: |
145 | rcu_assign_pointer(net->ipv4.fib_main, new); | |
146 | break; | |
147 | case RT_TABLE_DEFAULT: | |
148 | rcu_assign_pointer(net->ipv4.fib_default, new); | |
149 | break; | |
150 | default: | |
151 | break; | |
152 | } | |
153 | ||
154 | #endif | |
155 | /* replace the old table in the hlist */ | |
156 | hlist_replace_rcu(&old->tb_hlist, &new->tb_hlist); | |
157 | } | |
158 | ||
159 | int fib_unmerge(struct net *net) | |
160 | { | |
3b709334 | 161 | struct fib_table *old, *new, *main_table; |
0ddcf43d | 162 | |
3c9e9f73 | 163 | /* attempt to fetch local table if it has been allocated */ |
0ddcf43d | 164 | old = fib_get_table(net, RT_TABLE_LOCAL); |
3c9e9f73 AD |
165 | if (!old) |
166 | return 0; | |
0ddcf43d | 167 | |
3c9e9f73 | 168 | new = fib_trie_unmerge(old); |
0ddcf43d AD |
169 | if (!new) |
170 | return -ENOMEM; | |
171 | ||
3b709334 AD |
172 | /* table is already unmerged */ |
173 | if (new == old) | |
174 | return 0; | |
175 | ||
0ddcf43d | 176 | /* replace merged table with clean table */ |
3b709334 AD |
177 | fib_replace_table(net, old, new); |
178 | fib_free_table(old); | |
179 | ||
180 | /* attempt to fetch main table if it has been allocated */ | |
181 | main_table = fib_get_table(net, RT_TABLE_MAIN); | |
182 | if (!main_table) | |
183 | return 0; | |
184 | ||
185 | /* flush local entries from main table */ | |
186 | fib_table_flush_external(main_table); | |
0ddcf43d AD |
187 | |
188 | return 0; | |
189 | } | |
190 | ||
e4aef8ae | 191 | static void fib_flush(struct net *net) |
1da177e4 LT |
192 | { |
193 | int flushed = 0; | |
1af5a8c4 | 194 | unsigned int h; |
1da177e4 | 195 | |
1af5a8c4 | 196 | for (h = 0; h < FIB_TABLE_HASHSZ; h++) { |
a7e53531 AD |
197 | struct hlist_head *head = &net->ipv4.fib_table_hash[h]; |
198 | struct hlist_node *tmp; | |
199 | struct fib_table *tb; | |
200 | ||
201 | hlist_for_each_entry_safe(tb, tmp, head, tb_hlist) | |
f97f4dd8 | 202 | flushed += fib_table_flush(net, tb, false); |
1da177e4 | 203 | } |
1da177e4 LT |
204 | |
205 | if (flushed) | |
4ccfe6d4 | 206 | rt_cache_flush(net); |
1da177e4 LT |
207 | } |
208 | ||
05538116 LAT |
209 | /* |
210 | * Find address type as if only "dev" was present in the system. If | |
211 | * on_dev is NULL then all interfaces are taken into consideration. | |
212 | */ | |
95c96174 ED |
213 | static inline unsigned int __inet_dev_addr_type(struct net *net, |
214 | const struct net_device *dev, | |
9b8ff518 | 215 | __be32 addr, u32 tb_id) |
1da177e4 | 216 | { |
9ade2286 | 217 | struct flowi4 fl4 = { .daddr = addr }; |
1da177e4 | 218 | struct fib_result res; |
95c96174 | 219 | unsigned int ret = RTN_BROADCAST; |
15be405e | 220 | struct fib_table *table; |
1da177e4 | 221 | |
1e637c74 | 222 | if (ipv4_is_zeronet(addr) || ipv4_is_lbcast(addr)) |
1da177e4 | 223 | return RTN_BROADCAST; |
f97c1e0c | 224 | if (ipv4_is_multicast(addr)) |
1da177e4 LT |
225 | return RTN_MULTICAST; |
226 | ||
345e9b54 AD |
227 | rcu_read_lock(); |
228 | ||
15be405e DA |
229 | table = fib_get_table(net, tb_id); |
230 | if (table) { | |
1da177e4 | 231 | ret = RTN_UNICAST; |
15be405e | 232 | if (!fib_table_lookup(table, &fl4, &res, FIB_LOOKUP_NOREF)) { |
05538116 LAT |
233 | if (!dev || dev == res.fi->fib_dev) |
234 | ret = res.type; | |
1da177e4 LT |
235 | } |
236 | } | |
345e9b54 AD |
237 | |
238 | rcu_read_unlock(); | |
1da177e4 LT |
239 | return ret; |
240 | } | |
241 | ||
9b8ff518 | 242 | unsigned int inet_addr_type_table(struct net *net, __be32 addr, u32 tb_id) |
15be405e DA |
243 | { |
244 | return __inet_dev_addr_type(net, NULL, addr, tb_id); | |
245 | } | |
246 | EXPORT_SYMBOL(inet_addr_type_table); | |
247 | ||
6b175b26 | 248 | unsigned int inet_addr_type(struct net *net, __be32 addr) |
05538116 | 249 | { |
15be405e | 250 | return __inet_dev_addr_type(net, NULL, addr, RT_TABLE_LOCAL); |
05538116 | 251 | } |
4bc2f18b | 252 | EXPORT_SYMBOL(inet_addr_type); |
05538116 | 253 | |
6b175b26 EB |
254 | unsigned int inet_dev_addr_type(struct net *net, const struct net_device *dev, |
255 | __be32 addr) | |
05538116 | 256 | { |
3236b004 | 257 | u32 rt_table = l3mdev_fib_table(dev) ? : RT_TABLE_LOCAL; |
15be405e DA |
258 | |
259 | return __inet_dev_addr_type(net, dev, addr, rt_table); | |
05538116 | 260 | } |
4bc2f18b | 261 | EXPORT_SYMBOL(inet_dev_addr_type); |
05538116 | 262 | |
30bbaa19 DA |
263 | /* inet_addr_type with dev == NULL but using the table from a dev |
264 | * if one is associated | |
265 | */ | |
266 | unsigned int inet_addr_type_dev_table(struct net *net, | |
267 | const struct net_device *dev, | |
268 | __be32 addr) | |
269 | { | |
3236b004 | 270 | u32 rt_table = l3mdev_fib_table(dev) ? : RT_TABLE_LOCAL; |
30bbaa19 DA |
271 | |
272 | return __inet_dev_addr_type(net, NULL, addr, rt_table); | |
273 | } | |
274 | EXPORT_SYMBOL(inet_addr_type_dev_table); | |
275 | ||
35ebf65e DM |
276 | __be32 fib_compute_spec_dst(struct sk_buff *skb) |
277 | { | |
278 | struct net_device *dev = skb->dev; | |
279 | struct in_device *in_dev; | |
280 | struct fib_result res; | |
a207a4b2 | 281 | struct rtable *rt; |
35ebf65e | 282 | struct net *net; |
a207a4b2 | 283 | int scope; |
35ebf65e | 284 | |
a207a4b2 | 285 | rt = skb_rtable(skb); |
0cc535a2 JA |
286 | if ((rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST | RTCF_LOCAL)) == |
287 | RTCF_LOCAL) | |
35ebf65e DM |
288 | return ip_hdr(skb)->daddr; |
289 | ||
290 | in_dev = __in_dev_get_rcu(dev); | |
35ebf65e DM |
291 | |
292 | net = dev_net(dev); | |
a207a4b2 DM |
293 | |
294 | scope = RT_SCOPE_UNIVERSE; | |
295 | if (!ipv4_is_zeronet(ip_hdr(skb)->saddr)) { | |
9fc12023 | 296 | bool vmark = in_dev && IN_DEV_SRC_VMARK(in_dev); |
4cfc86f3 LR |
297 | struct flowi4 fl4 = { |
298 | .flowi4_iif = LOOPBACK_IFINDEX, | |
e7372197 | 299 | .flowi4_oif = l3mdev_master_ifindex_rcu(dev), |
4cfc86f3 LR |
300 | .daddr = ip_hdr(skb)->saddr, |
301 | .flowi4_tos = RT_TOS(ip_hdr(skb)->tos), | |
302 | .flowi4_scope = scope, | |
9fc12023 | 303 | .flowi4_mark = vmark ? skb->mark : 0, |
4cfc86f3 | 304 | }; |
0eeb075f | 305 | if (!fib_lookup(net, &fl4, &res, 0)) |
eba618ab | 306 | return fib_result_prefsrc(net, &res); |
a207a4b2 DM |
307 | } else { |
308 | scope = RT_SCOPE_LINK; | |
309 | } | |
310 | ||
311 | return inet_select_addr(dev, ip_hdr(skb)->saddr, scope); | |
35ebf65e DM |
312 | } |
313 | ||
78f2756c DA |
314 | bool fib_info_nh_uses_dev(struct fib_info *fi, const struct net_device *dev) |
315 | { | |
316 | bool dev_match = false; | |
075e264f | 317 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
78f2756c DA |
318 | int ret; |
319 | ||
78f2756c DA |
320 | for (ret = 0; ret < fi->fib_nhs; ret++) { |
321 | struct fib_nh *nh = &fi->fib_nh[ret]; | |
322 | ||
b75ed8b1 | 323 | if (nh->fib_nh_dev == dev) { |
78f2756c DA |
324 | dev_match = true; |
325 | break; | |
b75ed8b1 | 326 | } else if (l3mdev_master_ifindex_rcu(nh->fib_nh_dev) == dev->ifindex) { |
78f2756c DA |
327 | dev_match = true; |
328 | break; | |
329 | } | |
330 | } | |
331 | #else | |
b75ed8b1 | 332 | if (fi->fib_nh[0].fib_nh_dev == dev) |
78f2756c DA |
333 | dev_match = true; |
334 | #endif | |
335 | ||
336 | return dev_match; | |
337 | } | |
338 | EXPORT_SYMBOL_GPL(fib_info_nh_uses_dev); | |
339 | ||
1da177e4 | 340 | /* Given (packet source, input interface) and optional (dst, oif, tos): |
6a31d2a9 ED |
341 | * - (main) check, that source is valid i.e. not broadcast or our local |
342 | * address. | |
343 | * - figure out what "logical" interface this packet arrived | |
344 | * and calculate "specific destination" address. | |
345 | * - check, that packet arrived from expected physical interface. | |
ebc0ffae | 346 | * called with rcu_read_lock() |
1da177e4 | 347 | */ |
7a9bc9b8 DM |
348 | static int __fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst, |
349 | u8 tos, int oif, struct net_device *dev, | |
350 | int rpf, struct in_device *idev, u32 *itag) | |
1da177e4 | 351 | { |
5a847a6e DA |
352 | struct net *net = dev_net(dev); |
353 | struct flow_keys flkeys; | |
1dced6a8 | 354 | int ret, no_addr; |
1da177e4 | 355 | struct fib_result res; |
9e56e380 | 356 | struct flowi4 fl4; |
9e56e380 | 357 | bool dev_match; |
1da177e4 | 358 | |
9ade2286 | 359 | fl4.flowi4_oif = 0; |
385add90 | 360 | fl4.flowi4_iif = l3mdev_master_ifindex_rcu(dev); |
cd2fbe1b DA |
361 | if (!fl4.flowi4_iif) |
362 | fl4.flowi4_iif = oif ? : LOOPBACK_IFINDEX; | |
9ade2286 DM |
363 | fl4.daddr = src; |
364 | fl4.saddr = dst; | |
365 | fl4.flowi4_tos = tos; | |
366 | fl4.flowi4_scope = RT_SCOPE_UNIVERSE; | |
1b7179d3 | 367 | fl4.flowi4_tun_key.tun_id = 0; |
b84f7878 | 368 | fl4.flowi4_flags = 0; |
8bcfd092 | 369 | fl4.flowi4_uid = sock_net_uid(net, NULL); |
cc7e17ea | 370 | |
9e56e380 | 371 | no_addr = idev->ifa_list == NULL; |
990078af | 372 | |
9e56e380 | 373 | fl4.flowi4_mark = IN_DEV_SRC_VMARK(idev) ? skb->mark : 0; |
5a847a6e DA |
374 | if (!fib4_rules_early_flow_dissect(net, skb, &fl4, &flkeys)) { |
375 | fl4.flowi4_proto = 0; | |
376 | fl4.fl4_sport = 0; | |
377 | fl4.fl4_dport = 0; | |
378 | } | |
1da177e4 | 379 | |
0eeb075f | 380 | if (fib_lookup(net, &fl4, &res, 0)) |
1da177e4 | 381 | goto last_resort; |
1dced6a8 SB |
382 | if (res.type != RTN_UNICAST && |
383 | (res.type != RTN_LOCAL || !IN_DEV_ACCEPT_LOCAL(idev))) | |
384 | goto e_inval; | |
1da177e4 | 385 | fib_combine_itag(itag, &res); |
6f86b325 | 386 | |
78f2756c | 387 | dev_match = fib_info_nh_uses_dev(res.fi, dev); |
6f86b325 | 388 | if (dev_match) { |
eba618ab | 389 | ret = FIB_RES_NHC(res)->nhc_scope >= RT_SCOPE_HOST; |
1da177e4 LT |
390 | return ret; |
391 | } | |
1da177e4 LT |
392 | if (no_addr) |
393 | goto last_resort; | |
c1cf8422 | 394 | if (rpf == 1) |
b5f7e755 | 395 | goto e_rpf; |
9ade2286 | 396 | fl4.flowi4_oif = dev->ifindex; |
1da177e4 LT |
397 | |
398 | ret = 0; | |
0eeb075f | 399 | if (fib_lookup(net, &fl4, &res, FIB_LOOKUP_IGNORE_LINKSTATE) == 0) { |
41347dcd | 400 | if (res.type == RTN_UNICAST) |
eba618ab | 401 | ret = FIB_RES_NHC(res)->nhc_scope >= RT_SCOPE_HOST; |
1da177e4 LT |
402 | } |
403 | return ret; | |
404 | ||
405 | last_resort: | |
406 | if (rpf) | |
b5f7e755 | 407 | goto e_rpf; |
1da177e4 LT |
408 | *itag = 0; |
409 | return 0; | |
410 | ||
1da177e4 LT |
411 | e_inval: |
412 | return -EINVAL; | |
b5f7e755 ED |
413 | e_rpf: |
414 | return -EXDEV; | |
1da177e4 LT |
415 | } |
416 | ||
7a9bc9b8 DM |
417 | /* Ignore rp_filter for packets protected by IPsec. */ |
418 | int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst, | |
419 | u8 tos, int oif, struct net_device *dev, | |
420 | struct in_device *idev, u32 *itag) | |
421 | { | |
422 | int r = secpath_exists(skb) ? 0 : IN_DEV_RPFILTER(idev); | |
6e617de8 | 423 | struct net *net = dev_net(dev); |
7a9bc9b8 | 424 | |
6e617de8 | 425 | if (!r && !fib_num_tclassid_users(net) && |
e81da0e1 | 426 | (dev->ifindex != oif || !IN_DEV_TX_REDIRECTS(idev))) { |
6e617de8 PA |
427 | if (IN_DEV_ACCEPT_LOCAL(idev)) |
428 | goto ok; | |
032a4802 PA |
429 | /* with custom local routes in place, checking local addresses |
430 | * only will be too optimistic, with custom rules, checking | |
431 | * local addresses only can be too strict, e.g. due to vrf | |
6e617de8 | 432 | */ |
032a4802 PA |
433 | if (net->ipv4.fib_has_custom_local_routes || |
434 | fib4_has_custom_rules(net)) | |
6e617de8 PA |
435 | goto full_check; |
436 | if (inet_lookup_ifaddr_rcu(net, src)) | |
437 | return -EINVAL; | |
438 | ||
439 | ok: | |
7a9bc9b8 DM |
440 | *itag = 0; |
441 | return 0; | |
442 | } | |
6e617de8 PA |
443 | |
444 | full_check: | |
7a9bc9b8 DM |
445 | return __fib_validate_source(skb, src, dst, tos, oif, dev, r, idev, itag); |
446 | } | |
447 | ||
81f7bf6c | 448 | static inline __be32 sk_extract_addr(struct sockaddr *addr) |
4e902c57 TG |
449 | { |
450 | return ((struct sockaddr_in *) addr)->sin_addr.s_addr; | |
451 | } | |
452 | ||
453 | static int put_rtax(struct nlattr *mx, int len, int type, u32 value) | |
454 | { | |
455 | struct nlattr *nla; | |
456 | ||
457 | nla = (struct nlattr *) ((char *) mx + len); | |
458 | nla->nla_type = type; | |
459 | nla->nla_len = nla_attr_size(4); | |
460 | *(u32 *) nla_data(nla) = value; | |
461 | ||
462 | return len + nla_total_size(4); | |
463 | } | |
464 | ||
4b5d47d4 | 465 | static int rtentry_to_fib_config(struct net *net, int cmd, struct rtentry *rt, |
4e902c57 TG |
466 | struct fib_config *cfg) |
467 | { | |
6d85c10a | 468 | __be32 addr; |
4e902c57 TG |
469 | int plen; |
470 | ||
471 | memset(cfg, 0, sizeof(*cfg)); | |
4b5d47d4 | 472 | cfg->fc_nlinfo.nl_net = net; |
4e902c57 TG |
473 | |
474 | if (rt->rt_dst.sa_family != AF_INET) | |
475 | return -EAFNOSUPPORT; | |
476 | ||
477 | /* | |
478 | * Check mask for validity: | |
479 | * a) it must be contiguous. | |
480 | * b) destination must have all host bits clear. | |
481 | * c) if application forgot to set correct family (AF_INET), | |
482 | * reject request unless it is absolutely clear i.e. | |
483 | * both family and mask are zero. | |
484 | */ | |
485 | plen = 32; | |
486 | addr = sk_extract_addr(&rt->rt_dst); | |
487 | if (!(rt->rt_flags & RTF_HOST)) { | |
81f7bf6c | 488 | __be32 mask = sk_extract_addr(&rt->rt_genmask); |
4e902c57 TG |
489 | |
490 | if (rt->rt_genmask.sa_family != AF_INET) { | |
491 | if (mask || rt->rt_genmask.sa_family) | |
492 | return -EAFNOSUPPORT; | |
493 | } | |
494 | ||
495 | if (bad_mask(mask, addr)) | |
496 | return -EINVAL; | |
497 | ||
498 | plen = inet_mask_len(mask); | |
499 | } | |
500 | ||
501 | cfg->fc_dst_len = plen; | |
502 | cfg->fc_dst = addr; | |
503 | ||
504 | if (cmd != SIOCDELRT) { | |
505 | cfg->fc_nlflags = NLM_F_CREATE; | |
506 | cfg->fc_protocol = RTPROT_BOOT; | |
507 | } | |
508 | ||
509 | if (rt->rt_metric) | |
510 | cfg->fc_priority = rt->rt_metric - 1; | |
511 | ||
512 | if (rt->rt_flags & RTF_REJECT) { | |
513 | cfg->fc_scope = RT_SCOPE_HOST; | |
514 | cfg->fc_type = RTN_UNREACHABLE; | |
515 | return 0; | |
516 | } | |
517 | ||
518 | cfg->fc_scope = RT_SCOPE_NOWHERE; | |
519 | cfg->fc_type = RTN_UNICAST; | |
520 | ||
521 | if (rt->rt_dev) { | |
522 | char *colon; | |
523 | struct net_device *dev; | |
524 | char devname[IFNAMSIZ]; | |
525 | ||
526 | if (copy_from_user(devname, rt->rt_dev, IFNAMSIZ-1)) | |
527 | return -EFAULT; | |
528 | ||
529 | devname[IFNAMSIZ-1] = 0; | |
530 | colon = strchr(devname, ':'); | |
531 | if (colon) | |
532 | *colon = 0; | |
4b5d47d4 | 533 | dev = __dev_get_by_name(net, devname); |
4e902c57 TG |
534 | if (!dev) |
535 | return -ENODEV; | |
536 | cfg->fc_oif = dev->ifindex; | |
5a56a0b3 | 537 | cfg->fc_table = l3mdev_fib_table(dev); |
4e902c57 TG |
538 | if (colon) { |
539 | struct in_ifaddr *ifa; | |
540 | struct in_device *in_dev = __in_dev_get_rtnl(dev); | |
541 | if (!in_dev) | |
542 | return -ENODEV; | |
543 | *colon = ':'; | |
544 | for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) | |
545 | if (strcmp(ifa->ifa_label, devname) == 0) | |
546 | break; | |
51456b29 | 547 | if (!ifa) |
4e902c57 TG |
548 | return -ENODEV; |
549 | cfg->fc_prefsrc = ifa->ifa_local; | |
550 | } | |
551 | } | |
552 | ||
553 | addr = sk_extract_addr(&rt->rt_gateway); | |
554 | if (rt->rt_gateway.sa_family == AF_INET && addr) { | |
30bbaa19 DA |
555 | unsigned int addr_type; |
556 | ||
f35b794b DA |
557 | cfg->fc_gw4 = addr; |
558 | cfg->fc_gw_family = AF_INET; | |
30bbaa19 | 559 | addr_type = inet_addr_type_table(net, addr, cfg->fc_table); |
4e902c57 | 560 | if (rt->rt_flags & RTF_GATEWAY && |
30bbaa19 | 561 | addr_type == RTN_UNICAST) |
4e902c57 TG |
562 | cfg->fc_scope = RT_SCOPE_UNIVERSE; |
563 | } | |
564 | ||
565 | if (cmd == SIOCDELRT) | |
566 | return 0; | |
567 | ||
f35b794b | 568 | if (rt->rt_flags & RTF_GATEWAY && !cfg->fc_gw_family) |
4e902c57 TG |
569 | return -EINVAL; |
570 | ||
571 | if (cfg->fc_scope == RT_SCOPE_NOWHERE) | |
572 | cfg->fc_scope = RT_SCOPE_LINK; | |
573 | ||
574 | if (rt->rt_flags & (RTF_MTU | RTF_WINDOW | RTF_IRTT)) { | |
575 | struct nlattr *mx; | |
576 | int len = 0; | |
577 | ||
6396bb22 | 578 | mx = kcalloc(3, nla_total_size(4), GFP_KERNEL); |
51456b29 | 579 | if (!mx) |
4e902c57 TG |
580 | return -ENOMEM; |
581 | ||
582 | if (rt->rt_flags & RTF_MTU) | |
583 | len = put_rtax(mx, len, RTAX_ADVMSS, rt->rt_mtu - 40); | |
584 | ||
585 | if (rt->rt_flags & RTF_WINDOW) | |
586 | len = put_rtax(mx, len, RTAX_WINDOW, rt->rt_window); | |
587 | ||
588 | if (rt->rt_flags & RTF_IRTT) | |
589 | len = put_rtax(mx, len, RTAX_RTT, rt->rt_irtt << 3); | |
590 | ||
591 | cfg->fc_mx = mx; | |
592 | cfg->fc_mx_len = len; | |
593 | } | |
594 | ||
595 | return 0; | |
596 | } | |
597 | ||
1da177e4 | 598 | /* |
6a31d2a9 ED |
599 | * Handle IP routing ioctl calls. |
600 | * These are used to manipulate the routing tables | |
1da177e4 | 601 | */ |
ca25c300 | 602 | int ip_rt_ioctl(struct net *net, unsigned int cmd, struct rtentry *rt) |
1da177e4 | 603 | { |
4e902c57 | 604 | struct fib_config cfg; |
1da177e4 | 605 | int err; |
1da177e4 LT |
606 | |
607 | switch (cmd) { | |
608 | case SIOCADDRT: /* Add a route */ | |
609 | case SIOCDELRT: /* Delete a route */ | |
52e804c6 | 610 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 | 611 | return -EPERM; |
4e902c57 | 612 | |
1da177e4 | 613 | rtnl_lock(); |
ca25c300 | 614 | err = rtentry_to_fib_config(net, cmd, rt, &cfg); |
1da177e4 | 615 | if (err == 0) { |
4e902c57 TG |
616 | struct fib_table *tb; |
617 | ||
1da177e4 | 618 | if (cmd == SIOCDELRT) { |
1bad118a | 619 | tb = fib_get_table(net, cfg.fc_table); |
1da177e4 | 620 | if (tb) |
78055998 DA |
621 | err = fib_table_delete(net, tb, &cfg, |
622 | NULL); | |
4e902c57 TG |
623 | else |
624 | err = -ESRCH; | |
1da177e4 | 625 | } else { |
1bad118a | 626 | tb = fib_new_table(net, cfg.fc_table); |
1da177e4 | 627 | if (tb) |
6d8422a1 DA |
628 | err = fib_table_insert(net, tb, |
629 | &cfg, NULL); | |
4e902c57 TG |
630 | else |
631 | err = -ENOBUFS; | |
1da177e4 | 632 | } |
4e902c57 TG |
633 | |
634 | /* allocated by rtentry_to_fib_config() */ | |
635 | kfree(cfg.fc_mx); | |
1da177e4 LT |
636 | } |
637 | rtnl_unlock(); | |
638 | return err; | |
639 | } | |
640 | return -EINVAL; | |
641 | } | |
642 | ||
6a31d2a9 | 643 | const struct nla_policy rtm_ipv4_policy[RTA_MAX + 1] = { |
4e902c57 TG |
644 | [RTA_DST] = { .type = NLA_U32 }, |
645 | [RTA_SRC] = { .type = NLA_U32 }, | |
646 | [RTA_IIF] = { .type = NLA_U32 }, | |
647 | [RTA_OIF] = { .type = NLA_U32 }, | |
648 | [RTA_GATEWAY] = { .type = NLA_U32 }, | |
649 | [RTA_PRIORITY] = { .type = NLA_U32 }, | |
650 | [RTA_PREFSRC] = { .type = NLA_U32 }, | |
651 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
5176f91e | 652 | [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) }, |
4e902c57 | 653 | [RTA_FLOW] = { .type = NLA_U32 }, |
571e7226 RP |
654 | [RTA_ENCAP_TYPE] = { .type = NLA_U16 }, |
655 | [RTA_ENCAP] = { .type = NLA_NESTED }, | |
622ec2c9 | 656 | [RTA_UID] = { .type = NLA_U32 }, |
3b45a410 | 657 | [RTA_MARK] = { .type = NLA_U32 }, |
2eabd764 | 658 | [RTA_TABLE] = { .type = NLA_U32 }, |
404eb77e RP |
659 | [RTA_IP_PROTO] = { .type = NLA_U8 }, |
660 | [RTA_SPORT] = { .type = NLA_U16 }, | |
661 | [RTA_DPORT] = { .type = NLA_U16 }, | |
4e902c57 TG |
662 | }; |
663 | ||
d1566268 DA |
664 | int fib_gw_from_via(struct fib_config *cfg, struct nlattr *nla, |
665 | struct netlink_ext_ack *extack) | |
666 | { | |
667 | struct rtvia *via; | |
668 | int alen; | |
669 | ||
670 | if (nla_len(nla) < offsetof(struct rtvia, rtvia_addr)) { | |
671 | NL_SET_ERR_MSG(extack, "Invalid attribute length for RTA_VIA"); | |
672 | return -EINVAL; | |
673 | } | |
674 | ||
675 | via = nla_data(nla); | |
676 | alen = nla_len(nla) - offsetof(struct rtvia, rtvia_addr); | |
677 | ||
678 | switch (via->rtvia_family) { | |
679 | case AF_INET: | |
680 | if (alen != sizeof(__be32)) { | |
681 | NL_SET_ERR_MSG(extack, "Invalid IPv4 address in RTA_VIA"); | |
682 | return -EINVAL; | |
683 | } | |
684 | cfg->fc_gw_family = AF_INET; | |
685 | cfg->fc_gw4 = *((__be32 *)via->rtvia_addr); | |
686 | break; | |
687 | case AF_INET6: | |
688 | #ifdef CONFIG_IPV6 | |
689 | if (alen != sizeof(struct in6_addr)) { | |
690 | NL_SET_ERR_MSG(extack, "Invalid IPv6 address in RTA_VIA"); | |
691 | return -EINVAL; | |
692 | } | |
693 | cfg->fc_gw_family = AF_INET6; | |
694 | cfg->fc_gw6 = *((struct in6_addr *)via->rtvia_addr); | |
695 | #else | |
696 | NL_SET_ERR_MSG(extack, "IPv6 support not enabled in kernel"); | |
697 | return -EINVAL; | |
698 | #endif | |
699 | break; | |
700 | default: | |
701 | NL_SET_ERR_MSG(extack, "Unsupported address family in RTA_VIA"); | |
702 | return -EINVAL; | |
703 | } | |
704 | ||
705 | return 0; | |
706 | } | |
707 | ||
4b5d47d4 | 708 | static int rtm_to_fib_config(struct net *net, struct sk_buff *skb, |
6d8422a1 DA |
709 | struct nlmsghdr *nlh, struct fib_config *cfg, |
710 | struct netlink_ext_ack *extack) | |
1da177e4 | 711 | { |
d1566268 | 712 | bool has_gw = false, has_via = false; |
4e902c57 TG |
713 | struct nlattr *attr; |
714 | int err, remaining; | |
715 | struct rtmsg *rtm; | |
716 | ||
8cb08174 JB |
717 | err = nlmsg_validate_deprecated(nlh, sizeof(*rtm), RTA_MAX, |
718 | rtm_ipv4_policy, extack); | |
4e902c57 TG |
719 | if (err < 0) |
720 | goto errout; | |
721 | ||
722 | memset(cfg, 0, sizeof(*cfg)); | |
723 | ||
724 | rtm = nlmsg_data(nlh); | |
4e902c57 | 725 | cfg->fc_dst_len = rtm->rtm_dst_len; |
4e902c57 TG |
726 | cfg->fc_tos = rtm->rtm_tos; |
727 | cfg->fc_table = rtm->rtm_table; | |
728 | cfg->fc_protocol = rtm->rtm_protocol; | |
729 | cfg->fc_scope = rtm->rtm_scope; | |
730 | cfg->fc_type = rtm->rtm_type; | |
731 | cfg->fc_flags = rtm->rtm_flags; | |
732 | cfg->fc_nlflags = nlh->nlmsg_flags; | |
733 | ||
15e47304 | 734 | cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid; |
4e902c57 | 735 | cfg->fc_nlinfo.nlh = nlh; |
4b5d47d4 | 736 | cfg->fc_nlinfo.nl_net = net; |
4e902c57 | 737 | |
a0ee18b9 | 738 | if (cfg->fc_type > RTN_MAX) { |
c3ab2b4e | 739 | NL_SET_ERR_MSG(extack, "Invalid route type"); |
a0ee18b9 TG |
740 | err = -EINVAL; |
741 | goto errout; | |
742 | } | |
743 | ||
4e902c57 | 744 | nlmsg_for_each_attr(attr, nlh, sizeof(struct rtmsg), remaining) { |
8f4c1f9b | 745 | switch (nla_type(attr)) { |
4e902c57 | 746 | case RTA_DST: |
17fb2c64 | 747 | cfg->fc_dst = nla_get_be32(attr); |
4e902c57 | 748 | break; |
4e902c57 TG |
749 | case RTA_OIF: |
750 | cfg->fc_oif = nla_get_u32(attr); | |
751 | break; | |
752 | case RTA_GATEWAY: | |
d1566268 | 753 | has_gw = true; |
f35b794b | 754 | cfg->fc_gw4 = nla_get_be32(attr); |
d73f80f9 DA |
755 | if (cfg->fc_gw4) |
756 | cfg->fc_gw_family = AF_INET; | |
4e902c57 | 757 | break; |
b6e9e5df | 758 | case RTA_VIA: |
d1566268 DA |
759 | has_via = true; |
760 | err = fib_gw_from_via(cfg, attr, extack); | |
761 | if (err) | |
762 | goto errout; | |
763 | break; | |
4e902c57 TG |
764 | case RTA_PRIORITY: |
765 | cfg->fc_priority = nla_get_u32(attr); | |
766 | break; | |
767 | case RTA_PREFSRC: | |
17fb2c64 | 768 | cfg->fc_prefsrc = nla_get_be32(attr); |
4e902c57 TG |
769 | break; |
770 | case RTA_METRICS: | |
771 | cfg->fc_mx = nla_data(attr); | |
772 | cfg->fc_mx_len = nla_len(attr); | |
773 | break; | |
774 | case RTA_MULTIPATH: | |
9ed59592 | 775 | err = lwtunnel_valid_encap_type_attr(nla_data(attr), |
c255bd68 DA |
776 | nla_len(attr), |
777 | extack); | |
9ed59592 DA |
778 | if (err < 0) |
779 | goto errout; | |
4e902c57 TG |
780 | cfg->fc_mp = nla_data(attr); |
781 | cfg->fc_mp_len = nla_len(attr); | |
782 | break; | |
783 | case RTA_FLOW: | |
784 | cfg->fc_flow = nla_get_u32(attr); | |
785 | break; | |
4e902c57 TG |
786 | case RTA_TABLE: |
787 | cfg->fc_table = nla_get_u32(attr); | |
788 | break; | |
571e7226 RP |
789 | case RTA_ENCAP: |
790 | cfg->fc_encap = attr; | |
791 | break; | |
792 | case RTA_ENCAP_TYPE: | |
793 | cfg->fc_encap_type = nla_get_u16(attr); | |
c255bd68 DA |
794 | err = lwtunnel_valid_encap_type(cfg->fc_encap_type, |
795 | extack); | |
9ed59592 DA |
796 | if (err < 0) |
797 | goto errout; | |
571e7226 | 798 | break; |
1da177e4 LT |
799 | } |
800 | } | |
4e902c57 | 801 | |
d1566268 DA |
802 | if (has_gw && has_via) { |
803 | NL_SET_ERR_MSG(extack, | |
804 | "Nexthop configuration can not contain both GATEWAY and VIA"); | |
805 | goto errout; | |
806 | } | |
807 | ||
1da177e4 | 808 | return 0; |
4e902c57 TG |
809 | errout: |
810 | return err; | |
1da177e4 LT |
811 | } |
812 | ||
c21ef3e3 DA |
813 | static int inet_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, |
814 | struct netlink_ext_ack *extack) | |
1da177e4 | 815 | { |
3b1e0a65 | 816 | struct net *net = sock_net(skb->sk); |
4e902c57 TG |
817 | struct fib_config cfg; |
818 | struct fib_table *tb; | |
819 | int err; | |
1da177e4 | 820 | |
6d8422a1 | 821 | err = rtm_to_fib_config(net, skb, nlh, &cfg, extack); |
4e902c57 TG |
822 | if (err < 0) |
823 | goto errout; | |
1da177e4 | 824 | |
8ad4942c | 825 | tb = fib_get_table(net, cfg.fc_table); |
51456b29 | 826 | if (!tb) { |
c3ab2b4e | 827 | NL_SET_ERR_MSG(extack, "FIB table does not exist"); |
4e902c57 TG |
828 | err = -ESRCH; |
829 | goto errout; | |
830 | } | |
831 | ||
78055998 | 832 | err = fib_table_delete(net, tb, &cfg, extack); |
4e902c57 TG |
833 | errout: |
834 | return err; | |
1da177e4 LT |
835 | } |
836 | ||
c21ef3e3 DA |
837 | static int inet_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, |
838 | struct netlink_ext_ack *extack) | |
1da177e4 | 839 | { |
3b1e0a65 | 840 | struct net *net = sock_net(skb->sk); |
4e902c57 TG |
841 | struct fib_config cfg; |
842 | struct fib_table *tb; | |
843 | int err; | |
1da177e4 | 844 | |
6d8422a1 | 845 | err = rtm_to_fib_config(net, skb, nlh, &cfg, extack); |
4e902c57 TG |
846 | if (err < 0) |
847 | goto errout; | |
1da177e4 | 848 | |
226b0b4a | 849 | tb = fib_new_table(net, cfg.fc_table); |
51456b29 | 850 | if (!tb) { |
4e902c57 TG |
851 | err = -ENOBUFS; |
852 | goto errout; | |
853 | } | |
854 | ||
6d8422a1 | 855 | err = fib_table_insert(net, tb, &cfg, extack); |
6e617de8 PA |
856 | if (!err && cfg.fc_type == RTN_LOCAL) |
857 | net->ipv4.fib_has_custom_local_routes = true; | |
4e902c57 TG |
858 | errout: |
859 | return err; | |
1da177e4 LT |
860 | } |
861 | ||
4724676d DA |
862 | int ip_valid_fib_dump_req(struct net *net, const struct nlmsghdr *nlh, |
863 | struct fib_dump_filter *filter, | |
effe6792 | 864 | struct netlink_callback *cb) |
e8ba330a | 865 | { |
effe6792 DA |
866 | struct netlink_ext_ack *extack = cb->extack; |
867 | struct nlattr *tb[RTA_MAX + 1]; | |
e8ba330a | 868 | struct rtmsg *rtm; |
effe6792 DA |
869 | int err, i; |
870 | ||
871 | ASSERT_RTNL(); | |
e8ba330a DA |
872 | |
873 | if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*rtm))) { | |
874 | NL_SET_ERR_MSG(extack, "Invalid header for FIB dump request"); | |
875 | return -EINVAL; | |
876 | } | |
877 | ||
878 | rtm = nlmsg_data(nlh); | |
879 | if (rtm->rtm_dst_len || rtm->rtm_src_len || rtm->rtm_tos || | |
effe6792 | 880 | rtm->rtm_scope) { |
e8ba330a DA |
881 | NL_SET_ERR_MSG(extack, "Invalid values in header for FIB dump request"); |
882 | return -EINVAL; | |
883 | } | |
884 | if (rtm->rtm_flags & ~(RTM_F_CLONED | RTM_F_PREFIX)) { | |
885 | NL_SET_ERR_MSG(extack, "Invalid flags for FIB dump request"); | |
886 | return -EINVAL; | |
887 | } | |
888 | ||
ae677bbb | 889 | filter->dump_all_families = (rtm->rtm_family == AF_UNSPEC); |
effe6792 DA |
890 | filter->flags = rtm->rtm_flags; |
891 | filter->protocol = rtm->rtm_protocol; | |
892 | filter->rt_type = rtm->rtm_type; | |
893 | filter->table_id = rtm->rtm_table; | |
894 | ||
8cb08174 JB |
895 | err = nlmsg_parse_deprecated_strict(nlh, sizeof(*rtm), tb, RTA_MAX, |
896 | rtm_ipv4_policy, extack); | |
effe6792 DA |
897 | if (err < 0) |
898 | return err; | |
899 | ||
900 | for (i = 0; i <= RTA_MAX; ++i) { | |
901 | int ifindex; | |
902 | ||
903 | if (!tb[i]) | |
904 | continue; | |
905 | ||
906 | switch (i) { | |
907 | case RTA_TABLE: | |
908 | filter->table_id = nla_get_u32(tb[i]); | |
909 | break; | |
910 | case RTA_OIF: | |
911 | ifindex = nla_get_u32(tb[i]); | |
912 | filter->dev = __dev_get_by_index(net, ifindex); | |
913 | if (!filter->dev) | |
914 | return -ENODEV; | |
915 | break; | |
916 | default: | |
917 | NL_SET_ERR_MSG(extack, "Unsupported attribute in dump request"); | |
918 | return -EINVAL; | |
919 | } | |
920 | } | |
921 | ||
922 | if (filter->flags || filter->protocol || filter->rt_type || | |
923 | filter->table_id || filter->dev) { | |
924 | filter->filter_set = 1; | |
925 | cb->answer_flags = NLM_F_DUMP_FILTERED; | |
e8ba330a DA |
926 | } |
927 | ||
928 | return 0; | |
929 | } | |
930 | EXPORT_SYMBOL_GPL(ip_valid_fib_dump_req); | |
931 | ||
63f3444f | 932 | static int inet_dump_fib(struct sk_buff *skb, struct netlink_callback *cb) |
1da177e4 | 933 | { |
e8ba330a | 934 | const struct nlmsghdr *nlh = cb->nlh; |
3b1e0a65 | 935 | struct net *net = sock_net(skb->sk); |
4724676d | 936 | struct fib_dump_filter filter = {}; |
1af5a8c4 PM |
937 | unsigned int h, s_h; |
938 | unsigned int e = 0, s_e; | |
1da177e4 | 939 | struct fib_table *tb; |
e4aef8ae | 940 | struct hlist_head *head; |
f6c5775f | 941 | int dumped = 0, err; |
1da177e4 | 942 | |
e8ba330a | 943 | if (cb->strict_check) { |
effe6792 | 944 | err = ip_valid_fib_dump_req(net, nlh, &filter, cb); |
e8ba330a DA |
945 | if (err < 0) |
946 | return err; | |
e4e92fb1 DA |
947 | } else if (nlmsg_len(nlh) >= sizeof(struct rtmsg)) { |
948 | struct rtmsg *rtm = nlmsg_data(nlh); | |
949 | ||
950 | filter.flags = rtm->rtm_flags & (RTM_F_PREFIX | RTM_F_CLONED); | |
e8ba330a DA |
951 | } |
952 | ||
e4e92fb1 DA |
953 | /* fib entries are never clones and ipv4 does not use prefix flag */ |
954 | if (filter.flags & (RTM_F_PREFIX | RTM_F_CLONED)) | |
0b8c7f6f | 955 | return skb->len; |
1da177e4 | 956 | |
18a8021a DA |
957 | if (filter.table_id) { |
958 | tb = fib_get_table(net, filter.table_id); | |
959 | if (!tb) { | |
ae677bbb DA |
960 | if (filter.dump_all_families) |
961 | return skb->len; | |
962 | ||
18a8021a DA |
963 | NL_SET_ERR_MSG(cb->extack, "ipv4: FIB table does not exist"); |
964 | return -ENOENT; | |
965 | } | |
966 | ||
967 | err = fib_table_dump(tb, skb, cb, &filter); | |
968 | return skb->len ? : err; | |
969 | } | |
970 | ||
1af5a8c4 PM |
971 | s_h = cb->args[0]; |
972 | s_e = cb->args[1]; | |
973 | ||
a7e53531 AD |
974 | rcu_read_lock(); |
975 | ||
1af5a8c4 PM |
976 | for (h = s_h; h < FIB_TABLE_HASHSZ; h++, s_e = 0) { |
977 | e = 0; | |
e4aef8ae | 978 | head = &net->ipv4.fib_table_hash[h]; |
a7e53531 | 979 | hlist_for_each_entry_rcu(tb, head, tb_hlist) { |
1af5a8c4 PM |
980 | if (e < s_e) |
981 | goto next; | |
982 | if (dumped) | |
983 | memset(&cb->args[2], 0, sizeof(cb->args) - | |
e905a9ed | 984 | 2 * sizeof(cb->args[0])); |
18a8021a | 985 | err = fib_table_dump(tb, skb, cb, &filter); |
f6c5775f DA |
986 | if (err < 0) { |
987 | if (likely(skb->len)) | |
988 | goto out; | |
989 | ||
990 | goto out_err; | |
991 | } | |
1af5a8c4 PM |
992 | dumped = 1; |
993 | next: | |
994 | e++; | |
995 | } | |
1da177e4 | 996 | } |
1af5a8c4 | 997 | out: |
f6c5775f DA |
998 | err = skb->len; |
999 | out_err: | |
a7e53531 AD |
1000 | rcu_read_unlock(); |
1001 | ||
1af5a8c4 PM |
1002 | cb->args[1] = e; |
1003 | cb->args[0] = h; | |
1da177e4 | 1004 | |
f6c5775f | 1005 | return err; |
1da177e4 LT |
1006 | } |
1007 | ||
1008 | /* Prepare and feed intra-kernel routing request. | |
6a31d2a9 ED |
1009 | * Really, it should be netlink message, but :-( netlink |
1010 | * can be not configured, so that we feed it directly | |
1011 | * to fib engine. It is legal, because all events occur | |
1012 | * only when netlink is already locked. | |
1da177e4 | 1013 | */ |
af4d768a DA |
1014 | static void fib_magic(int cmd, int type, __be32 dst, int dst_len, |
1015 | struct in_ifaddr *ifa, u32 rt_priority) | |
1da177e4 | 1016 | { |
c346dca1 | 1017 | struct net *net = dev_net(ifa->ifa_dev->dev); |
3236b004 | 1018 | u32 tb_id = l3mdev_fib_table(ifa->ifa_dev->dev); |
4e902c57 TG |
1019 | struct fib_table *tb; |
1020 | struct fib_config cfg = { | |
1021 | .fc_protocol = RTPROT_KERNEL, | |
1022 | .fc_type = type, | |
1023 | .fc_dst = dst, | |
1024 | .fc_dst_len = dst_len, | |
af4d768a | 1025 | .fc_priority = rt_priority, |
4e902c57 TG |
1026 | .fc_prefsrc = ifa->ifa_local, |
1027 | .fc_oif = ifa->ifa_dev->dev->ifindex, | |
1028 | .fc_nlflags = NLM_F_CREATE | NLM_F_APPEND, | |
4d1169c1 | 1029 | .fc_nlinfo = { |
4b5d47d4 | 1030 | .nl_net = net, |
4d1169c1 | 1031 | }, |
4e902c57 | 1032 | }; |
1da177e4 | 1033 | |
021dd3b8 DA |
1034 | if (!tb_id) |
1035 | tb_id = (type == RTN_UNICAST) ? RT_TABLE_MAIN : RT_TABLE_LOCAL; | |
1da177e4 | 1036 | |
021dd3b8 | 1037 | tb = fib_new_table(net, tb_id); |
51456b29 | 1038 | if (!tb) |
1da177e4 LT |
1039 | return; |
1040 | ||
4e902c57 | 1041 | cfg.fc_table = tb->tb_id; |
1da177e4 | 1042 | |
4e902c57 TG |
1043 | if (type != RTN_LOCAL) |
1044 | cfg.fc_scope = RT_SCOPE_LINK; | |
1045 | else | |
1046 | cfg.fc_scope = RT_SCOPE_HOST; | |
1da177e4 LT |
1047 | |
1048 | if (cmd == RTM_NEWROUTE) | |
6d8422a1 | 1049 | fib_table_insert(net, tb, &cfg, NULL); |
1da177e4 | 1050 | else |
78055998 | 1051 | fib_table_delete(net, tb, &cfg, NULL); |
1da177e4 LT |
1052 | } |
1053 | ||
0ff60a45 | 1054 | void fib_add_ifaddr(struct in_ifaddr *ifa) |
1da177e4 LT |
1055 | { |
1056 | struct in_device *in_dev = ifa->ifa_dev; | |
1057 | struct net_device *dev = in_dev->dev; | |
1058 | struct in_ifaddr *prim = ifa; | |
a144ea4b AV |
1059 | __be32 mask = ifa->ifa_mask; |
1060 | __be32 addr = ifa->ifa_local; | |
6a31d2a9 | 1061 | __be32 prefix = ifa->ifa_address & mask; |
1da177e4 | 1062 | |
6a31d2a9 | 1063 | if (ifa->ifa_flags & IFA_F_SECONDARY) { |
1da177e4 | 1064 | prim = inet_ifa_byprefix(in_dev, prefix, mask); |
51456b29 | 1065 | if (!prim) { |
058bd4d2 | 1066 | pr_warn("%s: bug: prim == NULL\n", __func__); |
1da177e4 LT |
1067 | return; |
1068 | } | |
1069 | } | |
1070 | ||
af4d768a | 1071 | fib_magic(RTM_NEWROUTE, RTN_LOCAL, addr, 32, prim, 0); |
1da177e4 | 1072 | |
6a31d2a9 | 1073 | if (!(dev->flags & IFF_UP)) |
1da177e4 LT |
1074 | return; |
1075 | ||
1076 | /* Add broadcast address, if it is explicitly assigned. */ | |
a144ea4b | 1077 | if (ifa->ifa_broadcast && ifa->ifa_broadcast != htonl(0xFFFFFFFF)) |
af4d768a DA |
1078 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, |
1079 | prim, 0); | |
1da177e4 | 1080 | |
6a31d2a9 | 1081 | if (!ipv4_is_zeronet(prefix) && !(ifa->ifa_flags & IFA_F_SECONDARY) && |
1da177e4 | 1082 | (prefix != addr || ifa->ifa_prefixlen < 32)) { |
7b131180 PA |
1083 | if (!(ifa->ifa_flags & IFA_F_NOPREFIXROUTE)) |
1084 | fib_magic(RTM_NEWROUTE, | |
1085 | dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST, | |
af4d768a DA |
1086 | prefix, ifa->ifa_prefixlen, prim, |
1087 | ifa->ifa_rt_priority); | |
1da177e4 LT |
1088 | |
1089 | /* Add network specific broadcasts, when it takes a sense */ | |
1090 | if (ifa->ifa_prefixlen < 31) { | |
af4d768a DA |
1091 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix, 32, |
1092 | prim, 0); | |
6a31d2a9 | 1093 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix | ~mask, |
af4d768a | 1094 | 32, prim, 0); |
1da177e4 LT |
1095 | } |
1096 | } | |
1097 | } | |
1098 | ||
af4d768a DA |
1099 | void fib_modify_prefix_metric(struct in_ifaddr *ifa, u32 new_metric) |
1100 | { | |
1101 | __be32 prefix = ifa->ifa_address & ifa->ifa_mask; | |
1102 | struct in_device *in_dev = ifa->ifa_dev; | |
1103 | struct net_device *dev = in_dev->dev; | |
1104 | ||
1105 | if (!(dev->flags & IFF_UP) || | |
1106 | ifa->ifa_flags & (IFA_F_SECONDARY | IFA_F_NOPREFIXROUTE) || | |
1107 | ipv4_is_zeronet(prefix) || | |
1108 | prefix == ifa->ifa_local || ifa->ifa_prefixlen == 32) | |
1109 | return; | |
1110 | ||
1111 | /* add the new */ | |
1112 | fib_magic(RTM_NEWROUTE, | |
1113 | dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST, | |
1114 | prefix, ifa->ifa_prefixlen, ifa, new_metric); | |
1115 | ||
1116 | /* delete the old */ | |
1117 | fib_magic(RTM_DELROUTE, | |
1118 | dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST, | |
1119 | prefix, ifa->ifa_prefixlen, ifa, ifa->ifa_rt_priority); | |
1120 | } | |
1121 | ||
e6abbaa2 JA |
1122 | /* Delete primary or secondary address. |
1123 | * Optionally, on secondary address promotion consider the addresses | |
1124 | * from subnet iprim as deleted, even if they are in device list. | |
1125 | * In this case the secondary ifa can be in device list. | |
1126 | */ | |
1127 | void fib_del_ifaddr(struct in_ifaddr *ifa, struct in_ifaddr *iprim) | |
1da177e4 LT |
1128 | { |
1129 | struct in_device *in_dev = ifa->ifa_dev; | |
1130 | struct net_device *dev = in_dev->dev; | |
1131 | struct in_ifaddr *ifa1; | |
e6abbaa2 | 1132 | struct in_ifaddr *prim = ifa, *prim1 = NULL; |
6a31d2a9 ED |
1133 | __be32 brd = ifa->ifa_address | ~ifa->ifa_mask; |
1134 | __be32 any = ifa->ifa_address & ifa->ifa_mask; | |
1da177e4 LT |
1135 | #define LOCAL_OK 1 |
1136 | #define BRD_OK 2 | |
1137 | #define BRD0_OK 4 | |
1138 | #define BRD1_OK 8 | |
95c96174 | 1139 | unsigned int ok = 0; |
e6abbaa2 JA |
1140 | int subnet = 0; /* Primary network */ |
1141 | int gone = 1; /* Address is missing */ | |
1142 | int same_prefsrc = 0; /* Another primary with same IP */ | |
1da177e4 | 1143 | |
e6abbaa2 | 1144 | if (ifa->ifa_flags & IFA_F_SECONDARY) { |
1da177e4 | 1145 | prim = inet_ifa_byprefix(in_dev, any, ifa->ifa_mask); |
51456b29 | 1146 | if (!prim) { |
391a2033 PA |
1147 | /* if the device has been deleted, we don't perform |
1148 | * address promotion | |
1149 | */ | |
1150 | if (!in_dev->dead) | |
1151 | pr_warn("%s: bug: prim == NULL\n", __func__); | |
1da177e4 LT |
1152 | return; |
1153 | } | |
e6abbaa2 | 1154 | if (iprim && iprim != prim) { |
058bd4d2 | 1155 | pr_warn("%s: bug: iprim != prim\n", __func__); |
e6abbaa2 JA |
1156 | return; |
1157 | } | |
1158 | } else if (!ipv4_is_zeronet(any) && | |
1159 | (any != ifa->ifa_local || ifa->ifa_prefixlen < 32)) { | |
7b131180 PA |
1160 | if (!(ifa->ifa_flags & IFA_F_NOPREFIXROUTE)) |
1161 | fib_magic(RTM_DELROUTE, | |
1162 | dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST, | |
af4d768a | 1163 | any, ifa->ifa_prefixlen, prim, 0); |
e6abbaa2 | 1164 | subnet = 1; |
1da177e4 LT |
1165 | } |
1166 | ||
fbd40ea0 DM |
1167 | if (in_dev->dead) |
1168 | goto no_promotions; | |
1169 | ||
1da177e4 | 1170 | /* Deletion is more complicated than add. |
6a31d2a9 ED |
1171 | * We should take care of not to delete too much :-) |
1172 | * | |
1173 | * Scan address list to be sure that addresses are really gone. | |
1da177e4 LT |
1174 | */ |
1175 | ||
1176 | for (ifa1 = in_dev->ifa_list; ifa1; ifa1 = ifa1->ifa_next) { | |
e6abbaa2 JA |
1177 | if (ifa1 == ifa) { |
1178 | /* promotion, keep the IP */ | |
1179 | gone = 0; | |
1180 | continue; | |
1181 | } | |
1182 | /* Ignore IFAs from our subnet */ | |
1183 | if (iprim && ifa1->ifa_mask == iprim->ifa_mask && | |
1184 | inet_ifa_match(ifa1->ifa_address, iprim)) | |
1185 | continue; | |
1186 | ||
1187 | /* Ignore ifa1 if it uses different primary IP (prefsrc) */ | |
1188 | if (ifa1->ifa_flags & IFA_F_SECONDARY) { | |
1189 | /* Another address from our subnet? */ | |
1190 | if (ifa1->ifa_mask == prim->ifa_mask && | |
1191 | inet_ifa_match(ifa1->ifa_address, prim)) | |
1192 | prim1 = prim; | |
1193 | else { | |
1194 | /* We reached the secondaries, so | |
1195 | * same_prefsrc should be determined. | |
1196 | */ | |
1197 | if (!same_prefsrc) | |
1198 | continue; | |
1199 | /* Search new prim1 if ifa1 is not | |
1200 | * using the current prim1 | |
1201 | */ | |
1202 | if (!prim1 || | |
1203 | ifa1->ifa_mask != prim1->ifa_mask || | |
1204 | !inet_ifa_match(ifa1->ifa_address, prim1)) | |
1205 | prim1 = inet_ifa_byprefix(in_dev, | |
1206 | ifa1->ifa_address, | |
1207 | ifa1->ifa_mask); | |
1208 | if (!prim1) | |
1209 | continue; | |
1210 | if (prim1->ifa_local != prim->ifa_local) | |
1211 | continue; | |
1212 | } | |
1213 | } else { | |
1214 | if (prim->ifa_local != ifa1->ifa_local) | |
1215 | continue; | |
1216 | prim1 = ifa1; | |
1217 | if (prim != prim1) | |
1218 | same_prefsrc = 1; | |
1219 | } | |
1da177e4 LT |
1220 | if (ifa->ifa_local == ifa1->ifa_local) |
1221 | ok |= LOCAL_OK; | |
1222 | if (ifa->ifa_broadcast == ifa1->ifa_broadcast) | |
1223 | ok |= BRD_OK; | |
1224 | if (brd == ifa1->ifa_broadcast) | |
1225 | ok |= BRD1_OK; | |
1226 | if (any == ifa1->ifa_broadcast) | |
1227 | ok |= BRD0_OK; | |
e6abbaa2 JA |
1228 | /* primary has network specific broadcasts */ |
1229 | if (prim1 == ifa1 && ifa1->ifa_prefixlen < 31) { | |
1230 | __be32 brd1 = ifa1->ifa_address | ~ifa1->ifa_mask; | |
1231 | __be32 any1 = ifa1->ifa_address & ifa1->ifa_mask; | |
1232 | ||
1233 | if (!ipv4_is_zeronet(any1)) { | |
1234 | if (ifa->ifa_broadcast == brd1 || | |
1235 | ifa->ifa_broadcast == any1) | |
1236 | ok |= BRD_OK; | |
1237 | if (brd == brd1 || brd == any1) | |
1238 | ok |= BRD1_OK; | |
1239 | if (any == brd1 || any == any1) | |
1240 | ok |= BRD0_OK; | |
1241 | } | |
1242 | } | |
1da177e4 LT |
1243 | } |
1244 | ||
fbd40ea0 | 1245 | no_promotions: |
6a31d2a9 | 1246 | if (!(ok & BRD_OK)) |
af4d768a DA |
1247 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, |
1248 | prim, 0); | |
e6abbaa2 JA |
1249 | if (subnet && ifa->ifa_prefixlen < 31) { |
1250 | if (!(ok & BRD1_OK)) | |
af4d768a DA |
1251 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, brd, 32, |
1252 | prim, 0); | |
e6abbaa2 | 1253 | if (!(ok & BRD0_OK)) |
af4d768a DA |
1254 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, any, 32, |
1255 | prim, 0); | |
e6abbaa2 | 1256 | } |
6a31d2a9 | 1257 | if (!(ok & LOCAL_OK)) { |
30bbaa19 DA |
1258 | unsigned int addr_type; |
1259 | ||
af4d768a | 1260 | fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 32, prim, 0); |
1da177e4 LT |
1261 | |
1262 | /* Check, that this local address finally disappeared. */ | |
30bbaa19 DA |
1263 | addr_type = inet_addr_type_dev_table(dev_net(dev), dev, |
1264 | ifa->ifa_local); | |
1265 | if (gone && addr_type != RTN_LOCAL) { | |
1da177e4 | 1266 | /* And the last, but not the least thing. |
6a31d2a9 ED |
1267 | * We must flush stray FIB entries. |
1268 | * | |
1269 | * First of all, we scan fib_info list searching | |
1270 | * for stray nexthop entries, then ignite fib_flush. | |
1271 | */ | |
5a56a0b3 | 1272 | if (fib_sync_down_addr(dev, ifa->ifa_local)) |
c346dca1 | 1273 | fib_flush(dev_net(dev)); |
1da177e4 LT |
1274 | } |
1275 | } | |
1276 | #undef LOCAL_OK | |
1277 | #undef BRD_OK | |
1278 | #undef BRD0_OK | |
1279 | #undef BRD1_OK | |
1280 | } | |
1281 | ||
345e9b54 | 1282 | static void nl_fib_lookup(struct net *net, struct fib_result_nl *frn) |
246955fe | 1283 | { |
e905a9ed | 1284 | |
246955fe | 1285 | struct fib_result res; |
9ade2286 DM |
1286 | struct flowi4 fl4 = { |
1287 | .flowi4_mark = frn->fl_mark, | |
1288 | .daddr = frn->fl_addr, | |
1289 | .flowi4_tos = frn->fl_tos, | |
1290 | .flowi4_scope = frn->fl_scope, | |
6a31d2a9 | 1291 | }; |
345e9b54 AD |
1292 | struct fib_table *tb; |
1293 | ||
1294 | rcu_read_lock(); | |
1295 | ||
1296 | tb = fib_get_table(net, frn->tb_id_in); | |
1194ed0a AK |
1297 | |
1298 | frn->err = -ENOENT; | |
246955fe RO |
1299 | if (tb) { |
1300 | local_bh_disable(); | |
1301 | ||
1302 | frn->tb_id = tb->tb_id; | |
9ade2286 | 1303 | frn->err = fib_table_lookup(tb, &fl4, &res, FIB_LOOKUP_NOREF); |
246955fe RO |
1304 | |
1305 | if (!frn->err) { | |
1306 | frn->prefixlen = res.prefixlen; | |
1307 | frn->nh_sel = res.nh_sel; | |
1308 | frn->type = res.type; | |
1309 | frn->scope = res.scope; | |
1310 | } | |
1311 | local_bh_enable(); | |
1312 | } | |
345e9b54 AD |
1313 | |
1314 | rcu_read_unlock(); | |
246955fe RO |
1315 | } |
1316 | ||
28f7b036 | 1317 | static void nl_fib_input(struct sk_buff *skb) |
246955fe | 1318 | { |
6bd48fcf | 1319 | struct net *net; |
246955fe | 1320 | struct fib_result_nl *frn; |
28f7b036 | 1321 | struct nlmsghdr *nlh; |
15e47304 | 1322 | u32 portid; |
1194ed0a | 1323 | |
3b1e0a65 | 1324 | net = sock_net(skb->sk); |
b529ccf2 | 1325 | nlh = nlmsg_hdr(skb); |
c64c0b3c ED |
1326 | if (skb->len < nlmsg_total_size(sizeof(*frn)) || |
1327 | skb->len < nlh->nlmsg_len || | |
573ce260 | 1328 | nlmsg_len(nlh) < sizeof(*frn)) |
ea86575e | 1329 | return; |
d883a036 | 1330 | |
3a36515f | 1331 | skb = netlink_skb_clone(skb, GFP_KERNEL); |
51456b29 | 1332 | if (!skb) |
d883a036 DL |
1333 | return; |
1334 | nlh = nlmsg_hdr(skb); | |
e905a9ed | 1335 | |
573ce260 | 1336 | frn = (struct fib_result_nl *) nlmsg_data(nlh); |
345e9b54 | 1337 | nl_fib_lookup(net, frn); |
e905a9ed | 1338 | |
28a28283 | 1339 | portid = NETLINK_CB(skb).portid; /* netlink portid */ |
15e47304 | 1340 | NETLINK_CB(skb).portid = 0; /* from kernel */ |
ac6d439d | 1341 | NETLINK_CB(skb).dst_group = 0; /* unicast */ |
15e47304 | 1342 | netlink_unicast(net->ipv4.fibnl, skb, portid, MSG_DONTWAIT); |
e905a9ed | 1343 | } |
246955fe | 1344 | |
2c8c1e72 | 1345 | static int __net_init nl_fib_lookup_init(struct net *net) |
246955fe | 1346 | { |
6bd48fcf | 1347 | struct sock *sk; |
a31f2d17 PNA |
1348 | struct netlink_kernel_cfg cfg = { |
1349 | .input = nl_fib_input, | |
1350 | }; | |
1351 | ||
9f00d977 | 1352 | sk = netlink_kernel_create(net, NETLINK_FIB_LOOKUP, &cfg); |
51456b29 | 1353 | if (!sk) |
7b1a74fd | 1354 | return -EAFNOSUPPORT; |
6bd48fcf | 1355 | net->ipv4.fibnl = sk; |
7b1a74fd DL |
1356 | return 0; |
1357 | } | |
1358 | ||
1359 | static void nl_fib_lookup_exit(struct net *net) | |
1360 | { | |
b7c6ba6e | 1361 | netlink_kernel_release(net->ipv4.fibnl); |
775516bf | 1362 | net->ipv4.fibnl = NULL; |
246955fe RO |
1363 | } |
1364 | ||
4f823def JA |
1365 | static void fib_disable_ip(struct net_device *dev, unsigned long event, |
1366 | bool force) | |
1da177e4 | 1367 | { |
4f823def | 1368 | if (fib_sync_down_dev(dev, event, force)) |
c346dca1 | 1369 | fib_flush(dev_net(dev)); |
06b4fc52 GF |
1370 | else |
1371 | rt_cache_flush(dev_net(dev)); | |
1da177e4 LT |
1372 | arp_ifdown(dev); |
1373 | } | |
1374 | ||
1375 | static int fib_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1376 | { | |
6ed2533e | 1377 | struct in_ifaddr *ifa = (struct in_ifaddr *)ptr; |
76e6ebfb | 1378 | struct net_device *dev = ifa->ifa_dev->dev; |
436c3b66 | 1379 | struct net *net = dev_net(dev); |
1da177e4 LT |
1380 | |
1381 | switch (event) { | |
1382 | case NETDEV_UP: | |
1383 | fib_add_ifaddr(ifa); | |
1384 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
8a3d0316 | 1385 | fib_sync_up(dev, RTNH_F_DEAD); |
1da177e4 | 1386 | #endif |
436c3b66 | 1387 | atomic_inc(&net->ipv4.dev_addr_genid); |
4ccfe6d4 | 1388 | rt_cache_flush(dev_net(dev)); |
1da177e4 LT |
1389 | break; |
1390 | case NETDEV_DOWN: | |
e6abbaa2 | 1391 | fib_del_ifaddr(ifa, NULL); |
436c3b66 | 1392 | atomic_inc(&net->ipv4.dev_addr_genid); |
51456b29 | 1393 | if (!ifa->ifa_dev->ifa_list) { |
1da177e4 | 1394 | /* Last address was deleted from this interface. |
6a31d2a9 | 1395 | * Disable IP. |
1da177e4 | 1396 | */ |
4f823def | 1397 | fib_disable_ip(dev, event, true); |
1da177e4 | 1398 | } else { |
4ccfe6d4 | 1399 | rt_cache_flush(dev_net(dev)); |
1da177e4 LT |
1400 | } |
1401 | break; | |
1402 | } | |
1403 | return NOTIFY_DONE; | |
1404 | } | |
1405 | ||
1406 | static int fib_netdev_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1407 | { | |
351638e7 | 1408 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
af7d6cce SD |
1409 | struct netdev_notifier_changeupper_info *upper_info = ptr; |
1410 | struct netdev_notifier_info_ext *info_ext = ptr; | |
0115e8e3 | 1411 | struct in_device *in_dev; |
436c3b66 | 1412 | struct net *net = dev_net(dev); |
8a3d0316 | 1413 | unsigned int flags; |
1da177e4 LT |
1414 | |
1415 | if (event == NETDEV_UNREGISTER) { | |
4f823def | 1416 | fib_disable_ip(dev, event, true); |
caacf05e | 1417 | rt_flush_dev(dev); |
1da177e4 LT |
1418 | return NOTIFY_DONE; |
1419 | } | |
1420 | ||
0115e8e3 | 1421 | in_dev = __in_dev_get_rtnl(dev); |
a0065f26 OH |
1422 | if (!in_dev) |
1423 | return NOTIFY_DONE; | |
0115e8e3 | 1424 | |
1da177e4 LT |
1425 | switch (event) { |
1426 | case NETDEV_UP: | |
1427 | for_ifa(in_dev) { | |
1428 | fib_add_ifaddr(ifa); | |
1429 | } endfor_ifa(in_dev); | |
1430 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
8a3d0316 | 1431 | fib_sync_up(dev, RTNH_F_DEAD); |
1da177e4 | 1432 | #endif |
436c3b66 | 1433 | atomic_inc(&net->ipv4.dev_addr_genid); |
4ccfe6d4 | 1434 | rt_cache_flush(net); |
1da177e4 LT |
1435 | break; |
1436 | case NETDEV_DOWN: | |
4f823def | 1437 | fib_disable_ip(dev, event, false); |
1da177e4 | 1438 | break; |
1da177e4 | 1439 | case NETDEV_CHANGE: |
8a3d0316 AG |
1440 | flags = dev_get_flags(dev); |
1441 | if (flags & (IFF_RUNNING | IFF_LOWER_UP)) | |
1442 | fib_sync_up(dev, RTNH_F_LINKDOWN); | |
1443 | else | |
4f823def | 1444 | fib_sync_down_dev(dev, event, false); |
af7d6cce SD |
1445 | rt_cache_flush(net); |
1446 | break; | |
8a3d0316 | 1447 | case NETDEV_CHANGEMTU: |
af7d6cce | 1448 | fib_sync_mtu(dev, info_ext->ext.mtu); |
4ccfe6d4 | 1449 | rt_cache_flush(net); |
1da177e4 | 1450 | break; |
7f49e7a3 | 1451 | case NETDEV_CHANGEUPPER: |
af7d6cce | 1452 | upper_info = ptr; |
7f49e7a3 DA |
1453 | /* flush all routes if dev is linked to or unlinked from |
1454 | * an L3 master device (e.g., VRF) | |
1455 | */ | |
af7d6cce SD |
1456 | if (upper_info->upper_dev && |
1457 | netif_is_l3_master(upper_info->upper_dev)) | |
7f49e7a3 DA |
1458 | fib_disable_ip(dev, NETDEV_DOWN, true); |
1459 | break; | |
1da177e4 LT |
1460 | } |
1461 | return NOTIFY_DONE; | |
1462 | } | |
1463 | ||
1464 | static struct notifier_block fib_inetaddr_notifier = { | |
6ed2533e | 1465 | .notifier_call = fib_inetaddr_event, |
1da177e4 LT |
1466 | }; |
1467 | ||
1468 | static struct notifier_block fib_netdev_notifier = { | |
6ed2533e | 1469 | .notifier_call = fib_netdev_event, |
1da177e4 LT |
1470 | }; |
1471 | ||
7b1a74fd | 1472 | static int __net_init ip_fib_net_init(struct net *net) |
1da177e4 | 1473 | { |
dce5cbee | 1474 | int err; |
10da66f7 ED |
1475 | size_t size = sizeof(struct hlist_head) * FIB_TABLE_HASHSZ; |
1476 | ||
04b1d4e5 IS |
1477 | err = fib4_notifier_init(net); |
1478 | if (err) | |
1479 | return err; | |
cacaad11 | 1480 | |
10da66f7 ED |
1481 | /* Avoid false sharing : Use at least a full cache line */ |
1482 | size = max_t(size_t, size, L1_CACHE_BYTES); | |
1af5a8c4 | 1483 | |
10da66f7 | 1484 | net->ipv4.fib_table_hash = kzalloc(size, GFP_KERNEL); |
04b1d4e5 IS |
1485 | if (!net->ipv4.fib_table_hash) { |
1486 | err = -ENOMEM; | |
1487 | goto err_table_hash_alloc; | |
1488 | } | |
e4aef8ae | 1489 | |
dce5cbee DL |
1490 | err = fib4_rules_init(net); |
1491 | if (err < 0) | |
04b1d4e5 | 1492 | goto err_rules_init; |
dce5cbee DL |
1493 | return 0; |
1494 | ||
04b1d4e5 | 1495 | err_rules_init: |
dce5cbee | 1496 | kfree(net->ipv4.fib_table_hash); |
04b1d4e5 IS |
1497 | err_table_hash_alloc: |
1498 | fib4_notifier_exit(net); | |
dce5cbee | 1499 | return err; |
7b1a74fd | 1500 | } |
1da177e4 | 1501 | |
2c8c1e72 | 1502 | static void ip_fib_net_exit(struct net *net) |
7b1a74fd | 1503 | { |
b4681c28 | 1504 | int i; |
7b1a74fd | 1505 | |
6dede75b | 1506 | rtnl_lock(); |
6e47d6ca | 1507 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
6e47d6ca AD |
1508 | RCU_INIT_POINTER(net->ipv4.fib_main, NULL); |
1509 | RCU_INIT_POINTER(net->ipv4.fib_default, NULL); | |
1510 | #endif | |
b4681c28 IS |
1511 | /* Destroy the tables in reverse order to guarantee that the |
1512 | * local table, ID 255, is destroyed before the main table, ID | |
1513 | * 254. This is necessary as the local table may contain | |
1514 | * references to data contained in the main table. | |
1515 | */ | |
1516 | for (i = FIB_TABLE_HASHSZ - 1; i >= 0; i--) { | |
a7e53531 | 1517 | struct hlist_head *head = &net->ipv4.fib_table_hash[i]; |
b67bfe0d | 1518 | struct hlist_node *tmp; |
a7e53531 AD |
1519 | struct fib_table *tb; |
1520 | ||
b67bfe0d SL |
1521 | hlist_for_each_entry_safe(tb, tmp, head, tb_hlist) { |
1522 | hlist_del(&tb->tb_hlist); | |
f97f4dd8 | 1523 | fib_table_flush(net, tb, true); |
4aa2c466 | 1524 | fib_free_table(tb); |
7b1a74fd DL |
1525 | } |
1526 | } | |
ad88d051 AD |
1527 | |
1528 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
1529 | fib4_rules_exit(net); | |
1530 | #endif | |
e2666f84 | 1531 | rtnl_unlock(); |
e4aef8ae | 1532 | kfree(net->ipv4.fib_table_hash); |
04b1d4e5 | 1533 | fib4_notifier_exit(net); |
7b1a74fd DL |
1534 | } |
1535 | ||
1536 | static int __net_init fib_net_init(struct net *net) | |
1537 | { | |
1538 | int error; | |
1539 | ||
f4530fa5 DM |
1540 | #ifdef CONFIG_IP_ROUTE_CLASSID |
1541 | net->ipv4.fib_num_tclassid_users = 0; | |
1542 | #endif | |
7b1a74fd DL |
1543 | error = ip_fib_net_init(net); |
1544 | if (error < 0) | |
1545 | goto out; | |
1546 | error = nl_fib_lookup_init(net); | |
1547 | if (error < 0) | |
1548 | goto out_nlfl; | |
1549 | error = fib_proc_init(net); | |
1550 | if (error < 0) | |
1551 | goto out_proc; | |
1552 | out: | |
1553 | return error; | |
1554 | ||
1555 | out_proc: | |
1556 | nl_fib_lookup_exit(net); | |
1557 | out_nlfl: | |
1558 | ip_fib_net_exit(net); | |
1559 | goto out; | |
1560 | } | |
1561 | ||
1562 | static void __net_exit fib_net_exit(struct net *net) | |
1563 | { | |
1564 | fib_proc_exit(net); | |
1565 | nl_fib_lookup_exit(net); | |
1566 | ip_fib_net_exit(net); | |
1567 | } | |
1568 | ||
1569 | static struct pernet_operations fib_net_ops = { | |
1570 | .init = fib_net_init, | |
1571 | .exit = fib_net_exit, | |
1572 | }; | |
1573 | ||
1574 | void __init ip_fib_init(void) | |
1575 | { | |
8799a221 | 1576 | fib_trie_init(); |
7b1a74fd DL |
1577 | |
1578 | register_pernet_subsys(&fib_net_ops); | |
8799a221 | 1579 | |
7b1a74fd DL |
1580 | register_netdevice_notifier(&fib_netdev_notifier); |
1581 | register_inetaddr_notifier(&fib_inetaddr_notifier); | |
7f9b8052 | 1582 | |
b97bac64 FW |
1583 | rtnl_register(PF_INET, RTM_NEWROUTE, inet_rtm_newroute, NULL, 0); |
1584 | rtnl_register(PF_INET, RTM_DELROUTE, inet_rtm_delroute, NULL, 0); | |
1585 | rtnl_register(PF_INET, RTM_GETROUTE, NULL, inet_dump_fib, 0); | |
1da177e4 | 1586 | } |