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Commit | Line | Data |
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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 | 34 | |
f55fbb6a | 35 | #include <net/inet_dscp.h> |
1da177e4 LT |
36 | #include <net/ip.h> |
37 | #include <net/protocol.h> | |
38 | #include <net/route.h> | |
39 | #include <net/tcp.h> | |
40 | #include <net/sock.h> | |
1da177e4 LT |
41 | #include <net/arp.h> |
42 | #include <net/ip_fib.h> | |
5481d73f | 43 | #include <net/nexthop.h> |
63f3444f | 44 | #include <net/rtnetlink.h> |
990078af | 45 | #include <net/xfrm.h> |
385add90 | 46 | #include <net/l3mdev.h> |
9ed59592 | 47 | #include <net/lwtunnel.h> |
f6d3c192 | 48 | #include <trace/events/fib.h> |
1da177e4 | 49 | |
1da177e4 LT |
50 | #ifndef CONFIG_IP_MULTIPLE_TABLES |
51 | ||
7b1a74fd | 52 | static int __net_init fib4_rules_init(struct net *net) |
c3e9a353 | 53 | { |
93456b6d DL |
54 | struct fib_table *local_table, *main_table; |
55 | ||
0ddcf43d | 56 | main_table = fib_trie_table(RT_TABLE_MAIN, NULL); |
51456b29 | 57 | if (!main_table) |
61f0d861 | 58 | return -ENOMEM; |
dbb50165 | 59 | |
0ddcf43d | 60 | local_table = fib_trie_table(RT_TABLE_LOCAL, main_table); |
51456b29 | 61 | if (!local_table) |
61f0d861 | 62 | goto fail; |
0ddcf43d | 63 | |
93456b6d | 64 | hlist_add_head_rcu(&local_table->tb_hlist, |
e4aef8ae | 65 | &net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX]); |
93456b6d | 66 | hlist_add_head_rcu(&main_table->tb_hlist, |
e4aef8ae | 67 | &net->ipv4.fib_table_hash[TABLE_MAIN_INDEX]); |
dbb50165 DL |
68 | return 0; |
69 | ||
70 | fail: | |
61f0d861 | 71 | fib_free_table(main_table); |
dbb50165 | 72 | return -ENOMEM; |
c3e9a353 | 73 | } |
1af5a8c4 | 74 | #else |
1da177e4 | 75 | |
8ad4942c | 76 | struct fib_table *fib_new_table(struct net *net, u32 id) |
1da177e4 | 77 | { |
0ddcf43d | 78 | struct fib_table *tb, *alias = NULL; |
1af5a8c4 | 79 | unsigned int h; |
1da177e4 | 80 | |
1af5a8c4 PM |
81 | if (id == 0) |
82 | id = RT_TABLE_MAIN; | |
8ad4942c | 83 | tb = fib_get_table(net, id); |
1af5a8c4 PM |
84 | if (tb) |
85 | return tb; | |
7f9b8052 | 86 | |
5350d54f | 87 | if (id == RT_TABLE_LOCAL && !net->ipv4.fib_has_custom_rules) |
0ddcf43d AD |
88 | alias = fib_new_table(net, RT_TABLE_MAIN); |
89 | ||
90 | tb = fib_trie_table(id, alias); | |
1da177e4 LT |
91 | if (!tb) |
92 | return NULL; | |
f4530fa5 DM |
93 | |
94 | switch (id) { | |
f4530fa5 | 95 | case RT_TABLE_MAIN: |
a7e53531 | 96 | rcu_assign_pointer(net->ipv4.fib_main, tb); |
f4530fa5 | 97 | break; |
f4530fa5 | 98 | case RT_TABLE_DEFAULT: |
a7e53531 | 99 | rcu_assign_pointer(net->ipv4.fib_default, tb); |
f4530fa5 | 100 | break; |
f4530fa5 DM |
101 | default: |
102 | break; | |
103 | } | |
104 | ||
1af5a8c4 | 105 | h = id & (FIB_TABLE_HASHSZ - 1); |
e4aef8ae | 106 | hlist_add_head_rcu(&tb->tb_hlist, &net->ipv4.fib_table_hash[h]); |
1da177e4 LT |
107 | return tb; |
108 | } | |
b3b4663c | 109 | EXPORT_SYMBOL_GPL(fib_new_table); |
1da177e4 | 110 | |
345e9b54 | 111 | /* caller must hold either rtnl or rcu read lock */ |
8ad4942c | 112 | struct fib_table *fib_get_table(struct net *net, u32 id) |
1af5a8c4 PM |
113 | { |
114 | struct fib_table *tb; | |
e4aef8ae | 115 | struct hlist_head *head; |
1af5a8c4 | 116 | unsigned int h; |
1da177e4 | 117 | |
1af5a8c4 PM |
118 | if (id == 0) |
119 | id = RT_TABLE_MAIN; | |
120 | h = id & (FIB_TABLE_HASHSZ - 1); | |
e4aef8ae | 121 | |
e4aef8ae | 122 | head = &net->ipv4.fib_table_hash[h]; |
7fd69b0b JFG |
123 | hlist_for_each_entry_rcu(tb, head, tb_hlist, |
124 | lockdep_rtnl_is_held()) { | |
345e9b54 | 125 | if (tb->tb_id == id) |
1af5a8c4 | 126 | return tb; |
1af5a8c4 | 127 | } |
1af5a8c4 PM |
128 | return NULL; |
129 | } | |
1da177e4 LT |
130 | #endif /* CONFIG_IP_MULTIPLE_TABLES */ |
131 | ||
0ddcf43d AD |
132 | static void fib_replace_table(struct net *net, struct fib_table *old, |
133 | struct fib_table *new) | |
134 | { | |
135 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
136 | switch (new->tb_id) { | |
0ddcf43d AD |
137 | case RT_TABLE_MAIN: |
138 | rcu_assign_pointer(net->ipv4.fib_main, new); | |
139 | break; | |
140 | case RT_TABLE_DEFAULT: | |
141 | rcu_assign_pointer(net->ipv4.fib_default, new); | |
142 | break; | |
143 | default: | |
144 | break; | |
145 | } | |
146 | ||
147 | #endif | |
148 | /* replace the old table in the hlist */ | |
149 | hlist_replace_rcu(&old->tb_hlist, &new->tb_hlist); | |
150 | } | |
151 | ||
152 | int fib_unmerge(struct net *net) | |
153 | { | |
3b709334 | 154 | struct fib_table *old, *new, *main_table; |
0ddcf43d | 155 | |
3c9e9f73 | 156 | /* attempt to fetch local table if it has been allocated */ |
0ddcf43d | 157 | old = fib_get_table(net, RT_TABLE_LOCAL); |
3c9e9f73 AD |
158 | if (!old) |
159 | return 0; | |
0ddcf43d | 160 | |
3c9e9f73 | 161 | new = fib_trie_unmerge(old); |
0ddcf43d AD |
162 | if (!new) |
163 | return -ENOMEM; | |
164 | ||
3b709334 AD |
165 | /* table is already unmerged */ |
166 | if (new == old) | |
167 | return 0; | |
168 | ||
0ddcf43d | 169 | /* replace merged table with clean table */ |
3b709334 AD |
170 | fib_replace_table(net, old, new); |
171 | fib_free_table(old); | |
172 | ||
173 | /* attempt to fetch main table if it has been allocated */ | |
174 | main_table = fib_get_table(net, RT_TABLE_MAIN); | |
175 | if (!main_table) | |
176 | return 0; | |
177 | ||
178 | /* flush local entries from main table */ | |
179 | fib_table_flush_external(main_table); | |
0ddcf43d AD |
180 | |
181 | return 0; | |
182 | } | |
183 | ||
9bd83667 | 184 | void fib_flush(struct net *net) |
1da177e4 LT |
185 | { |
186 | int flushed = 0; | |
1af5a8c4 | 187 | unsigned int h; |
1da177e4 | 188 | |
1af5a8c4 | 189 | for (h = 0; h < FIB_TABLE_HASHSZ; h++) { |
a7e53531 AD |
190 | struct hlist_head *head = &net->ipv4.fib_table_hash[h]; |
191 | struct hlist_node *tmp; | |
192 | struct fib_table *tb; | |
193 | ||
194 | hlist_for_each_entry_safe(tb, tmp, head, tb_hlist) | |
f97f4dd8 | 195 | flushed += fib_table_flush(net, tb, false); |
1da177e4 | 196 | } |
1da177e4 LT |
197 | |
198 | if (flushed) | |
4ccfe6d4 | 199 | rt_cache_flush(net); |
1da177e4 LT |
200 | } |
201 | ||
05538116 LAT |
202 | /* |
203 | * Find address type as if only "dev" was present in the system. If | |
204 | * on_dev is NULL then all interfaces are taken into consideration. | |
205 | */ | |
95c96174 ED |
206 | static inline unsigned int __inet_dev_addr_type(struct net *net, |
207 | const struct net_device *dev, | |
9b8ff518 | 208 | __be32 addr, u32 tb_id) |
1da177e4 | 209 | { |
9ade2286 | 210 | struct flowi4 fl4 = { .daddr = addr }; |
1da177e4 | 211 | struct fib_result res; |
95c96174 | 212 | unsigned int ret = RTN_BROADCAST; |
15be405e | 213 | struct fib_table *table; |
1da177e4 | 214 | |
1e637c74 | 215 | if (ipv4_is_zeronet(addr) || ipv4_is_lbcast(addr)) |
1da177e4 | 216 | return RTN_BROADCAST; |
f97c1e0c | 217 | if (ipv4_is_multicast(addr)) |
1da177e4 LT |
218 | return RTN_MULTICAST; |
219 | ||
345e9b54 AD |
220 | rcu_read_lock(); |
221 | ||
15be405e DA |
222 | table = fib_get_table(net, tb_id); |
223 | if (table) { | |
1da177e4 | 224 | ret = RTN_UNICAST; |
15be405e | 225 | if (!fib_table_lookup(table, &fl4, &res, FIB_LOOKUP_NOREF)) { |
dcb1ecb5 | 226 | struct fib_nh_common *nhc = fib_info_nhc(res.fi, 0); |
5481d73f | 227 | |
dcb1ecb5 | 228 | if (!dev || dev == nhc->nhc_dev) |
05538116 | 229 | ret = res.type; |
1da177e4 LT |
230 | } |
231 | } | |
345e9b54 AD |
232 | |
233 | rcu_read_unlock(); | |
1da177e4 LT |
234 | return ret; |
235 | } | |
236 | ||
9b8ff518 | 237 | unsigned int inet_addr_type_table(struct net *net, __be32 addr, u32 tb_id) |
15be405e DA |
238 | { |
239 | return __inet_dev_addr_type(net, NULL, addr, tb_id); | |
240 | } | |
241 | EXPORT_SYMBOL(inet_addr_type_table); | |
242 | ||
6b175b26 | 243 | unsigned int inet_addr_type(struct net *net, __be32 addr) |
05538116 | 244 | { |
15be405e | 245 | return __inet_dev_addr_type(net, NULL, addr, RT_TABLE_LOCAL); |
05538116 | 246 | } |
4bc2f18b | 247 | EXPORT_SYMBOL(inet_addr_type); |
05538116 | 248 | |
6b175b26 EB |
249 | unsigned int inet_dev_addr_type(struct net *net, const struct net_device *dev, |
250 | __be32 addr) | |
05538116 | 251 | { |
3236b004 | 252 | u32 rt_table = l3mdev_fib_table(dev) ? : RT_TABLE_LOCAL; |
15be405e DA |
253 | |
254 | return __inet_dev_addr_type(net, dev, addr, rt_table); | |
05538116 | 255 | } |
4bc2f18b | 256 | EXPORT_SYMBOL(inet_dev_addr_type); |
05538116 | 257 | |
30bbaa19 DA |
258 | /* inet_addr_type with dev == NULL but using the table from a dev |
259 | * if one is associated | |
260 | */ | |
261 | unsigned int inet_addr_type_dev_table(struct net *net, | |
262 | const struct net_device *dev, | |
263 | __be32 addr) | |
264 | { | |
3236b004 | 265 | u32 rt_table = l3mdev_fib_table(dev) ? : RT_TABLE_LOCAL; |
30bbaa19 DA |
266 | |
267 | return __inet_dev_addr_type(net, NULL, addr, rt_table); | |
268 | } | |
269 | EXPORT_SYMBOL(inet_addr_type_dev_table); | |
270 | ||
35ebf65e DM |
271 | __be32 fib_compute_spec_dst(struct sk_buff *skb) |
272 | { | |
273 | struct net_device *dev = skb->dev; | |
274 | struct in_device *in_dev; | |
275 | struct fib_result res; | |
a207a4b2 | 276 | struct rtable *rt; |
35ebf65e | 277 | struct net *net; |
a207a4b2 | 278 | int scope; |
35ebf65e | 279 | |
a207a4b2 | 280 | rt = skb_rtable(skb); |
0cc535a2 JA |
281 | if ((rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST | RTCF_LOCAL)) == |
282 | RTCF_LOCAL) | |
35ebf65e DM |
283 | return ip_hdr(skb)->daddr; |
284 | ||
285 | in_dev = __in_dev_get_rcu(dev); | |
35ebf65e DM |
286 | |
287 | net = dev_net(dev); | |
a207a4b2 DM |
288 | |
289 | scope = RT_SCOPE_UNIVERSE; | |
290 | if (!ipv4_is_zeronet(ip_hdr(skb)->saddr)) { | |
9fc12023 | 291 | bool vmark = in_dev && IN_DEV_SRC_VMARK(in_dev); |
4cfc86f3 LR |
292 | struct flowi4 fl4 = { |
293 | .flowi4_iif = LOOPBACK_IFINDEX, | |
40867d74 | 294 | .flowi4_l3mdev = l3mdev_master_ifindex_rcu(dev), |
4cfc86f3 | 295 | .daddr = ip_hdr(skb)->saddr, |
21fdca22 | 296 | .flowi4_tos = ip_hdr(skb)->tos & IPTOS_RT_MASK, |
4cfc86f3 | 297 | .flowi4_scope = scope, |
9fc12023 | 298 | .flowi4_mark = vmark ? skb->mark : 0, |
4cfc86f3 | 299 | }; |
0eeb075f | 300 | if (!fib_lookup(net, &fl4, &res, 0)) |
eba618ab | 301 | return fib_result_prefsrc(net, &res); |
a207a4b2 DM |
302 | } else { |
303 | scope = RT_SCOPE_LINK; | |
304 | } | |
305 | ||
306 | return inet_select_addr(dev, ip_hdr(skb)->saddr, scope); | |
35ebf65e DM |
307 | } |
308 | ||
78f2756c DA |
309 | bool fib_info_nh_uses_dev(struct fib_info *fi, const struct net_device *dev) |
310 | { | |
311 | bool dev_match = false; | |
075e264f | 312 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
1fd1c768 DA |
313 | if (unlikely(fi->nh)) { |
314 | dev_match = nexthop_uses_dev(fi->nh, dev); | |
315 | } else { | |
316 | int ret; | |
78f2756c | 317 | |
1fd1c768 DA |
318 | for (ret = 0; ret < fib_info_num_path(fi); ret++) { |
319 | const struct fib_nh_common *nhc = fib_info_nhc(fi, ret); | |
78f2756c | 320 | |
1fd1c768 DA |
321 | if (nhc_l3mdev_matches_dev(nhc, dev)) { |
322 | dev_match = true; | |
323 | break; | |
324 | } | |
78f2756c DA |
325 | } |
326 | } | |
327 | #else | |
dcb1ecb5 | 328 | if (fib_info_nhc(fi, 0)->nhc_dev == dev) |
78f2756c DA |
329 | dev_match = true; |
330 | #endif | |
331 | ||
332 | return dev_match; | |
333 | } | |
334 | EXPORT_SYMBOL_GPL(fib_info_nh_uses_dev); | |
335 | ||
1da177e4 | 336 | /* Given (packet source, input interface) and optional (dst, oif, tos): |
6a31d2a9 ED |
337 | * - (main) check, that source is valid i.e. not broadcast or our local |
338 | * address. | |
339 | * - figure out what "logical" interface this packet arrived | |
340 | * and calculate "specific destination" address. | |
341 | * - check, that packet arrived from expected physical interface. | |
ebc0ffae | 342 | * called with rcu_read_lock() |
1da177e4 | 343 | */ |
7a9bc9b8 DM |
344 | static int __fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst, |
345 | u8 tos, int oif, struct net_device *dev, | |
346 | int rpf, struct in_device *idev, u32 *itag) | |
1da177e4 | 347 | { |
5a847a6e DA |
348 | struct net *net = dev_net(dev); |
349 | struct flow_keys flkeys; | |
1dced6a8 | 350 | int ret, no_addr; |
1da177e4 | 351 | struct fib_result res; |
9e56e380 | 352 | struct flowi4 fl4; |
9e56e380 | 353 | bool dev_match; |
1da177e4 | 354 | |
9ade2286 | 355 | fl4.flowi4_oif = 0; |
40867d74 DA |
356 | fl4.flowi4_l3mdev = l3mdev_master_ifindex_rcu(dev); |
357 | fl4.flowi4_iif = oif ? : LOOPBACK_IFINDEX; | |
9ade2286 DM |
358 | fl4.daddr = src; |
359 | fl4.saddr = dst; | |
360 | fl4.flowi4_tos = tos; | |
361 | fl4.flowi4_scope = RT_SCOPE_UNIVERSE; | |
1b7179d3 | 362 | fl4.flowi4_tun_key.tun_id = 0; |
b84f7878 | 363 | fl4.flowi4_flags = 0; |
8bcfd092 | 364 | fl4.flowi4_uid = sock_net_uid(net, NULL); |
1869e226 | 365 | fl4.flowi4_multipath_hash = 0; |
cc7e17ea | 366 | |
9e56e380 | 367 | no_addr = idev->ifa_list == NULL; |
990078af | 368 | |
9e56e380 | 369 | fl4.flowi4_mark = IN_DEV_SRC_VMARK(idev) ? skb->mark : 0; |
5a847a6e DA |
370 | if (!fib4_rules_early_flow_dissect(net, skb, &fl4, &flkeys)) { |
371 | fl4.flowi4_proto = 0; | |
372 | fl4.fl4_sport = 0; | |
373 | fl4.fl4_dport = 0; | |
c69f114d MW |
374 | } else { |
375 | swap(fl4.fl4_sport, fl4.fl4_dport); | |
5a847a6e | 376 | } |
1da177e4 | 377 | |
0eeb075f | 378 | if (fib_lookup(net, &fl4, &res, 0)) |
1da177e4 | 379 | goto last_resort; |
1dced6a8 SB |
380 | if (res.type != RTN_UNICAST && |
381 | (res.type != RTN_LOCAL || !IN_DEV_ACCEPT_LOCAL(idev))) | |
382 | goto e_inval; | |
1da177e4 | 383 | fib_combine_itag(itag, &res); |
6f86b325 | 384 | |
78f2756c | 385 | dev_match = fib_info_nh_uses_dev(res.fi, dev); |
66f82095 CW |
386 | /* This is not common, loopback packets retain skb_dst so normally they |
387 | * would not even hit this slow path. | |
388 | */ | |
389 | dev_match = dev_match || (res.type == RTN_LOCAL && | |
390 | dev == net->loopback_dev); | |
6f86b325 | 391 | if (dev_match) { |
eba618ab | 392 | ret = FIB_RES_NHC(res)->nhc_scope >= RT_SCOPE_HOST; |
1da177e4 LT |
393 | return ret; |
394 | } | |
1da177e4 LT |
395 | if (no_addr) |
396 | goto last_resort; | |
c1cf8422 | 397 | if (rpf == 1) |
b5f7e755 | 398 | goto e_rpf; |
9ade2286 | 399 | fl4.flowi4_oif = dev->ifindex; |
1da177e4 LT |
400 | |
401 | ret = 0; | |
0eeb075f | 402 | if (fib_lookup(net, &fl4, &res, FIB_LOOKUP_IGNORE_LINKSTATE) == 0) { |
41347dcd | 403 | if (res.type == RTN_UNICAST) |
eba618ab | 404 | ret = FIB_RES_NHC(res)->nhc_scope >= RT_SCOPE_HOST; |
1da177e4 LT |
405 | } |
406 | return ret; | |
407 | ||
408 | last_resort: | |
409 | if (rpf) | |
b5f7e755 | 410 | goto e_rpf; |
1da177e4 LT |
411 | *itag = 0; |
412 | return 0; | |
413 | ||
1da177e4 LT |
414 | e_inval: |
415 | return -EINVAL; | |
b5f7e755 ED |
416 | e_rpf: |
417 | return -EXDEV; | |
1da177e4 LT |
418 | } |
419 | ||
7a9bc9b8 DM |
420 | /* Ignore rp_filter for packets protected by IPsec. */ |
421 | int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst, | |
422 | u8 tos, int oif, struct net_device *dev, | |
423 | struct in_device *idev, u32 *itag) | |
424 | { | |
425 | int r = secpath_exists(skb) ? 0 : IN_DEV_RPFILTER(idev); | |
6e617de8 | 426 | struct net *net = dev_net(dev); |
7a9bc9b8 | 427 | |
6e617de8 | 428 | if (!r && !fib_num_tclassid_users(net) && |
e81da0e1 | 429 | (dev->ifindex != oif || !IN_DEV_TX_REDIRECTS(idev))) { |
6e617de8 PA |
430 | if (IN_DEV_ACCEPT_LOCAL(idev)) |
431 | goto ok; | |
032a4802 PA |
432 | /* with custom local routes in place, checking local addresses |
433 | * only will be too optimistic, with custom rules, checking | |
434 | * local addresses only can be too strict, e.g. due to vrf | |
6e617de8 | 435 | */ |
032a4802 PA |
436 | if (net->ipv4.fib_has_custom_local_routes || |
437 | fib4_has_custom_rules(net)) | |
6e617de8 | 438 | goto full_check; |
9d2d38c3 ZY |
439 | /* Within the same container, it is regarded as a martian source, |
440 | * and the same host but different containers are not. | |
441 | */ | |
6e617de8 PA |
442 | if (inet_lookup_ifaddr_rcu(net, src)) |
443 | return -EINVAL; | |
444 | ||
445 | ok: | |
7a9bc9b8 DM |
446 | *itag = 0; |
447 | return 0; | |
448 | } | |
6e617de8 PA |
449 | |
450 | full_check: | |
7a9bc9b8 DM |
451 | return __fib_validate_source(skb, src, dst, tos, oif, dev, r, idev, itag); |
452 | } | |
453 | ||
81f7bf6c | 454 | static inline __be32 sk_extract_addr(struct sockaddr *addr) |
4e902c57 TG |
455 | { |
456 | return ((struct sockaddr_in *) addr)->sin_addr.s_addr; | |
457 | } | |
458 | ||
459 | static int put_rtax(struct nlattr *mx, int len, int type, u32 value) | |
460 | { | |
461 | struct nlattr *nla; | |
462 | ||
463 | nla = (struct nlattr *) ((char *) mx + len); | |
464 | nla->nla_type = type; | |
465 | nla->nla_len = nla_attr_size(4); | |
466 | *(u32 *) nla_data(nla) = value; | |
467 | ||
468 | return len + nla_total_size(4); | |
469 | } | |
470 | ||
4b5d47d4 | 471 | static int rtentry_to_fib_config(struct net *net, int cmd, struct rtentry *rt, |
4e902c57 TG |
472 | struct fib_config *cfg) |
473 | { | |
6d85c10a | 474 | __be32 addr; |
4e902c57 TG |
475 | int plen; |
476 | ||
477 | memset(cfg, 0, sizeof(*cfg)); | |
4b5d47d4 | 478 | cfg->fc_nlinfo.nl_net = net; |
4e902c57 TG |
479 | |
480 | if (rt->rt_dst.sa_family != AF_INET) | |
481 | return -EAFNOSUPPORT; | |
482 | ||
483 | /* | |
484 | * Check mask for validity: | |
485 | * a) it must be contiguous. | |
486 | * b) destination must have all host bits clear. | |
487 | * c) if application forgot to set correct family (AF_INET), | |
488 | * reject request unless it is absolutely clear i.e. | |
489 | * both family and mask are zero. | |
490 | */ | |
491 | plen = 32; | |
492 | addr = sk_extract_addr(&rt->rt_dst); | |
493 | if (!(rt->rt_flags & RTF_HOST)) { | |
81f7bf6c | 494 | __be32 mask = sk_extract_addr(&rt->rt_genmask); |
4e902c57 TG |
495 | |
496 | if (rt->rt_genmask.sa_family != AF_INET) { | |
497 | if (mask || rt->rt_genmask.sa_family) | |
498 | return -EAFNOSUPPORT; | |
499 | } | |
500 | ||
501 | if (bad_mask(mask, addr)) | |
502 | return -EINVAL; | |
503 | ||
504 | plen = inet_mask_len(mask); | |
505 | } | |
506 | ||
507 | cfg->fc_dst_len = plen; | |
508 | cfg->fc_dst = addr; | |
509 | ||
510 | if (cmd != SIOCDELRT) { | |
511 | cfg->fc_nlflags = NLM_F_CREATE; | |
512 | cfg->fc_protocol = RTPROT_BOOT; | |
513 | } | |
514 | ||
515 | if (rt->rt_metric) | |
516 | cfg->fc_priority = rt->rt_metric - 1; | |
517 | ||
518 | if (rt->rt_flags & RTF_REJECT) { | |
519 | cfg->fc_scope = RT_SCOPE_HOST; | |
520 | cfg->fc_type = RTN_UNREACHABLE; | |
521 | return 0; | |
522 | } | |
523 | ||
524 | cfg->fc_scope = RT_SCOPE_NOWHERE; | |
525 | cfg->fc_type = RTN_UNICAST; | |
526 | ||
527 | if (rt->rt_dev) { | |
528 | char *colon; | |
529 | struct net_device *dev; | |
530 | char devname[IFNAMSIZ]; | |
531 | ||
532 | if (copy_from_user(devname, rt->rt_dev, IFNAMSIZ-1)) | |
533 | return -EFAULT; | |
534 | ||
535 | devname[IFNAMSIZ-1] = 0; | |
536 | colon = strchr(devname, ':'); | |
537 | if (colon) | |
538 | *colon = 0; | |
4b5d47d4 | 539 | dev = __dev_get_by_name(net, devname); |
4e902c57 TG |
540 | if (!dev) |
541 | return -ENODEV; | |
542 | cfg->fc_oif = dev->ifindex; | |
5a56a0b3 | 543 | cfg->fc_table = l3mdev_fib_table(dev); |
4e902c57 | 544 | if (colon) { |
cd5a411d FW |
545 | const struct in_ifaddr *ifa; |
546 | struct in_device *in_dev; | |
547 | ||
548 | in_dev = __in_dev_get_rtnl(dev); | |
4e902c57 TG |
549 | if (!in_dev) |
550 | return -ENODEV; | |
cd5a411d | 551 | |
4e902c57 | 552 | *colon = ':'; |
cd5a411d FW |
553 | |
554 | rcu_read_lock(); | |
555 | in_dev_for_each_ifa_rcu(ifa, in_dev) { | |
4e902c57 TG |
556 | if (strcmp(ifa->ifa_label, devname) == 0) |
557 | break; | |
cd5a411d FW |
558 | } |
559 | rcu_read_unlock(); | |
560 | ||
51456b29 | 561 | if (!ifa) |
4e902c57 TG |
562 | return -ENODEV; |
563 | cfg->fc_prefsrc = ifa->ifa_local; | |
564 | } | |
565 | } | |
566 | ||
567 | addr = sk_extract_addr(&rt->rt_gateway); | |
568 | if (rt->rt_gateway.sa_family == AF_INET && addr) { | |
30bbaa19 DA |
569 | unsigned int addr_type; |
570 | ||
f35b794b DA |
571 | cfg->fc_gw4 = addr; |
572 | cfg->fc_gw_family = AF_INET; | |
30bbaa19 | 573 | addr_type = inet_addr_type_table(net, addr, cfg->fc_table); |
4e902c57 | 574 | if (rt->rt_flags & RTF_GATEWAY && |
30bbaa19 | 575 | addr_type == RTN_UNICAST) |
4e902c57 TG |
576 | cfg->fc_scope = RT_SCOPE_UNIVERSE; |
577 | } | |
578 | ||
579 | if (cmd == SIOCDELRT) | |
580 | return 0; | |
581 | ||
f35b794b | 582 | if (rt->rt_flags & RTF_GATEWAY && !cfg->fc_gw_family) |
4e902c57 TG |
583 | return -EINVAL; |
584 | ||
585 | if (cfg->fc_scope == RT_SCOPE_NOWHERE) | |
586 | cfg->fc_scope = RT_SCOPE_LINK; | |
587 | ||
588 | if (rt->rt_flags & (RTF_MTU | RTF_WINDOW | RTF_IRTT)) { | |
589 | struct nlattr *mx; | |
590 | int len = 0; | |
591 | ||
6396bb22 | 592 | mx = kcalloc(3, nla_total_size(4), GFP_KERNEL); |
51456b29 | 593 | if (!mx) |
4e902c57 TG |
594 | return -ENOMEM; |
595 | ||
596 | if (rt->rt_flags & RTF_MTU) | |
597 | len = put_rtax(mx, len, RTAX_ADVMSS, rt->rt_mtu - 40); | |
598 | ||
599 | if (rt->rt_flags & RTF_WINDOW) | |
600 | len = put_rtax(mx, len, RTAX_WINDOW, rt->rt_window); | |
601 | ||
602 | if (rt->rt_flags & RTF_IRTT) | |
603 | len = put_rtax(mx, len, RTAX_RTT, rt->rt_irtt << 3); | |
604 | ||
605 | cfg->fc_mx = mx; | |
606 | cfg->fc_mx_len = len; | |
607 | } | |
608 | ||
609 | return 0; | |
610 | } | |
611 | ||
1da177e4 | 612 | /* |
6a31d2a9 ED |
613 | * Handle IP routing ioctl calls. |
614 | * These are used to manipulate the routing tables | |
1da177e4 | 615 | */ |
ca25c300 | 616 | int ip_rt_ioctl(struct net *net, unsigned int cmd, struct rtentry *rt) |
1da177e4 | 617 | { |
4e902c57 | 618 | struct fib_config cfg; |
1da177e4 | 619 | int err; |
1da177e4 LT |
620 | |
621 | switch (cmd) { | |
622 | case SIOCADDRT: /* Add a route */ | |
623 | case SIOCDELRT: /* Delete a route */ | |
52e804c6 | 624 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 | 625 | return -EPERM; |
4e902c57 | 626 | |
1da177e4 | 627 | rtnl_lock(); |
ca25c300 | 628 | err = rtentry_to_fib_config(net, cmd, rt, &cfg); |
1da177e4 | 629 | if (err == 0) { |
4e902c57 TG |
630 | struct fib_table *tb; |
631 | ||
1da177e4 | 632 | if (cmd == SIOCDELRT) { |
1bad118a | 633 | tb = fib_get_table(net, cfg.fc_table); |
1da177e4 | 634 | if (tb) |
78055998 DA |
635 | err = fib_table_delete(net, tb, &cfg, |
636 | NULL); | |
4e902c57 TG |
637 | else |
638 | err = -ESRCH; | |
1da177e4 | 639 | } else { |
1bad118a | 640 | tb = fib_new_table(net, cfg.fc_table); |
1da177e4 | 641 | if (tb) |
6d8422a1 DA |
642 | err = fib_table_insert(net, tb, |
643 | &cfg, NULL); | |
4e902c57 TG |
644 | else |
645 | err = -ENOBUFS; | |
1da177e4 | 646 | } |
4e902c57 TG |
647 | |
648 | /* allocated by rtentry_to_fib_config() */ | |
649 | kfree(cfg.fc_mx); | |
1da177e4 LT |
650 | } |
651 | rtnl_unlock(); | |
652 | return err; | |
653 | } | |
654 | return -EINVAL; | |
655 | } | |
656 | ||
6a31d2a9 | 657 | const struct nla_policy rtm_ipv4_policy[RTA_MAX + 1] = { |
75425657 | 658 | [RTA_UNSPEC] = { .strict_start_type = RTA_DPORT + 1 }, |
4e902c57 TG |
659 | [RTA_DST] = { .type = NLA_U32 }, |
660 | [RTA_SRC] = { .type = NLA_U32 }, | |
661 | [RTA_IIF] = { .type = NLA_U32 }, | |
662 | [RTA_OIF] = { .type = NLA_U32 }, | |
663 | [RTA_GATEWAY] = { .type = NLA_U32 }, | |
664 | [RTA_PRIORITY] = { .type = NLA_U32 }, | |
665 | [RTA_PREFSRC] = { .type = NLA_U32 }, | |
666 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
5176f91e | 667 | [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) }, |
4e902c57 | 668 | [RTA_FLOW] = { .type = NLA_U32 }, |
571e7226 RP |
669 | [RTA_ENCAP_TYPE] = { .type = NLA_U16 }, |
670 | [RTA_ENCAP] = { .type = NLA_NESTED }, | |
622ec2c9 | 671 | [RTA_UID] = { .type = NLA_U32 }, |
3b45a410 | 672 | [RTA_MARK] = { .type = NLA_U32 }, |
2eabd764 | 673 | [RTA_TABLE] = { .type = NLA_U32 }, |
404eb77e RP |
674 | [RTA_IP_PROTO] = { .type = NLA_U8 }, |
675 | [RTA_SPORT] = { .type = NLA_U16 }, | |
676 | [RTA_DPORT] = { .type = NLA_U16 }, | |
493ced1a | 677 | [RTA_NH_ID] = { .type = NLA_U32 }, |
4e902c57 TG |
678 | }; |
679 | ||
d1566268 DA |
680 | int fib_gw_from_via(struct fib_config *cfg, struct nlattr *nla, |
681 | struct netlink_ext_ack *extack) | |
682 | { | |
683 | struct rtvia *via; | |
684 | int alen; | |
685 | ||
686 | if (nla_len(nla) < offsetof(struct rtvia, rtvia_addr)) { | |
687 | NL_SET_ERR_MSG(extack, "Invalid attribute length for RTA_VIA"); | |
688 | return -EINVAL; | |
689 | } | |
690 | ||
691 | via = nla_data(nla); | |
692 | alen = nla_len(nla) - offsetof(struct rtvia, rtvia_addr); | |
693 | ||
694 | switch (via->rtvia_family) { | |
695 | case AF_INET: | |
696 | if (alen != sizeof(__be32)) { | |
697 | NL_SET_ERR_MSG(extack, "Invalid IPv4 address in RTA_VIA"); | |
698 | return -EINVAL; | |
699 | } | |
700 | cfg->fc_gw_family = AF_INET; | |
701 | cfg->fc_gw4 = *((__be32 *)via->rtvia_addr); | |
702 | break; | |
703 | case AF_INET6: | |
c09c8a27 | 704 | #if IS_ENABLED(CONFIG_IPV6) |
d1566268 DA |
705 | if (alen != sizeof(struct in6_addr)) { |
706 | NL_SET_ERR_MSG(extack, "Invalid IPv6 address in RTA_VIA"); | |
707 | return -EINVAL; | |
708 | } | |
709 | cfg->fc_gw_family = AF_INET6; | |
710 | cfg->fc_gw6 = *((struct in6_addr *)via->rtvia_addr); | |
711 | #else | |
712 | NL_SET_ERR_MSG(extack, "IPv6 support not enabled in kernel"); | |
713 | return -EINVAL; | |
714 | #endif | |
715 | break; | |
716 | default: | |
717 | NL_SET_ERR_MSG(extack, "Unsupported address family in RTA_VIA"); | |
718 | return -EINVAL; | |
719 | } | |
720 | ||
721 | return 0; | |
722 | } | |
723 | ||
4b5d47d4 | 724 | static int rtm_to_fib_config(struct net *net, struct sk_buff *skb, |
6d8422a1 DA |
725 | struct nlmsghdr *nlh, struct fib_config *cfg, |
726 | struct netlink_ext_ack *extack) | |
1da177e4 | 727 | { |
d1566268 | 728 | bool has_gw = false, has_via = false; |
4e902c57 TG |
729 | struct nlattr *attr; |
730 | int err, remaining; | |
731 | struct rtmsg *rtm; | |
732 | ||
8cb08174 JB |
733 | err = nlmsg_validate_deprecated(nlh, sizeof(*rtm), RTA_MAX, |
734 | rtm_ipv4_policy, extack); | |
4e902c57 TG |
735 | if (err < 0) |
736 | goto errout; | |
737 | ||
738 | memset(cfg, 0, sizeof(*cfg)); | |
739 | ||
740 | rtm = nlmsg_data(nlh); | |
f55fbb6a GN |
741 | |
742 | if (!inet_validate_dscp(rtm->rtm_tos)) { | |
743 | NL_SET_ERR_MSG(extack, | |
744 | "Invalid dsfield (tos): ECN bits must be 0"); | |
745 | err = -EINVAL; | |
746 | goto errout; | |
747 | } | |
748 | cfg->fc_dscp = inet_dsfield_to_dscp(rtm->rtm_tos); | |
749 | ||
4e902c57 | 750 | cfg->fc_dst_len = rtm->rtm_dst_len; |
4e902c57 TG |
751 | cfg->fc_table = rtm->rtm_table; |
752 | cfg->fc_protocol = rtm->rtm_protocol; | |
753 | cfg->fc_scope = rtm->rtm_scope; | |
754 | cfg->fc_type = rtm->rtm_type; | |
755 | cfg->fc_flags = rtm->rtm_flags; | |
756 | cfg->fc_nlflags = nlh->nlmsg_flags; | |
757 | ||
15e47304 | 758 | cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid; |
4e902c57 | 759 | cfg->fc_nlinfo.nlh = nlh; |
4b5d47d4 | 760 | cfg->fc_nlinfo.nl_net = net; |
4e902c57 | 761 | |
a0ee18b9 | 762 | if (cfg->fc_type > RTN_MAX) { |
c3ab2b4e | 763 | NL_SET_ERR_MSG(extack, "Invalid route type"); |
a0ee18b9 TG |
764 | err = -EINVAL; |
765 | goto errout; | |
766 | } | |
767 | ||
4e902c57 | 768 | nlmsg_for_each_attr(attr, nlh, sizeof(struct rtmsg), remaining) { |
8f4c1f9b | 769 | switch (nla_type(attr)) { |
4e902c57 | 770 | case RTA_DST: |
17fb2c64 | 771 | cfg->fc_dst = nla_get_be32(attr); |
4e902c57 | 772 | break; |
4e902c57 TG |
773 | case RTA_OIF: |
774 | cfg->fc_oif = nla_get_u32(attr); | |
775 | break; | |
776 | case RTA_GATEWAY: | |
d1566268 | 777 | has_gw = true; |
f35b794b | 778 | cfg->fc_gw4 = nla_get_be32(attr); |
d73f80f9 DA |
779 | if (cfg->fc_gw4) |
780 | cfg->fc_gw_family = AF_INET; | |
4e902c57 | 781 | break; |
b6e9e5df | 782 | case RTA_VIA: |
d1566268 DA |
783 | has_via = true; |
784 | err = fib_gw_from_via(cfg, attr, extack); | |
785 | if (err) | |
786 | goto errout; | |
787 | break; | |
4e902c57 TG |
788 | case RTA_PRIORITY: |
789 | cfg->fc_priority = nla_get_u32(attr); | |
790 | break; | |
791 | case RTA_PREFSRC: | |
17fb2c64 | 792 | cfg->fc_prefsrc = nla_get_be32(attr); |
4e902c57 TG |
793 | break; |
794 | case RTA_METRICS: | |
795 | cfg->fc_mx = nla_data(attr); | |
796 | cfg->fc_mx_len = nla_len(attr); | |
797 | break; | |
798 | case RTA_MULTIPATH: | |
9ed59592 | 799 | err = lwtunnel_valid_encap_type_attr(nla_data(attr), |
c255bd68 DA |
800 | nla_len(attr), |
801 | extack); | |
9ed59592 DA |
802 | if (err < 0) |
803 | goto errout; | |
4e902c57 TG |
804 | cfg->fc_mp = nla_data(attr); |
805 | cfg->fc_mp_len = nla_len(attr); | |
806 | break; | |
807 | case RTA_FLOW: | |
808 | cfg->fc_flow = nla_get_u32(attr); | |
809 | break; | |
4e902c57 TG |
810 | case RTA_TABLE: |
811 | cfg->fc_table = nla_get_u32(attr); | |
812 | break; | |
571e7226 RP |
813 | case RTA_ENCAP: |
814 | cfg->fc_encap = attr; | |
815 | break; | |
816 | case RTA_ENCAP_TYPE: | |
817 | cfg->fc_encap_type = nla_get_u16(attr); | |
c255bd68 DA |
818 | err = lwtunnel_valid_encap_type(cfg->fc_encap_type, |
819 | extack); | |
9ed59592 DA |
820 | if (err < 0) |
821 | goto errout; | |
571e7226 | 822 | break; |
493ced1a DA |
823 | case RTA_NH_ID: |
824 | cfg->fc_nh_id = nla_get_u32(attr); | |
825 | break; | |
826 | } | |
827 | } | |
828 | ||
829 | if (cfg->fc_nh_id) { | |
830 | if (cfg->fc_oif || cfg->fc_gw_family || | |
831 | cfg->fc_encap || cfg->fc_mp) { | |
832 | NL_SET_ERR_MSG(extack, | |
833 | "Nexthop specification and nexthop id are mutually exclusive"); | |
834 | return -EINVAL; | |
1da177e4 LT |
835 | } |
836 | } | |
4e902c57 | 837 | |
d1566268 DA |
838 | if (has_gw && has_via) { |
839 | NL_SET_ERR_MSG(extack, | |
840 | "Nexthop configuration can not contain both GATEWAY and VIA"); | |
b410f04e | 841 | return -EINVAL; |
d1566268 DA |
842 | } |
843 | ||
1da177e4 | 844 | return 0; |
4e902c57 TG |
845 | errout: |
846 | return err; | |
1da177e4 LT |
847 | } |
848 | ||
c21ef3e3 DA |
849 | static int inet_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, |
850 | struct netlink_ext_ack *extack) | |
1da177e4 | 851 | { |
3b1e0a65 | 852 | struct net *net = sock_net(skb->sk); |
4e902c57 TG |
853 | struct fib_config cfg; |
854 | struct fib_table *tb; | |
855 | int err; | |
1da177e4 | 856 | |
6d8422a1 | 857 | err = rtm_to_fib_config(net, skb, nlh, &cfg, extack); |
4e902c57 TG |
858 | if (err < 0) |
859 | goto errout; | |
1da177e4 | 860 | |
493ced1a DA |
861 | if (cfg.fc_nh_id && !nexthop_find_by_id(net, cfg.fc_nh_id)) { |
862 | NL_SET_ERR_MSG(extack, "Nexthop id does not exist"); | |
863 | err = -EINVAL; | |
864 | goto errout; | |
865 | } | |
866 | ||
8ad4942c | 867 | tb = fib_get_table(net, cfg.fc_table); |
51456b29 | 868 | if (!tb) { |
c3ab2b4e | 869 | NL_SET_ERR_MSG(extack, "FIB table does not exist"); |
4e902c57 TG |
870 | err = -ESRCH; |
871 | goto errout; | |
872 | } | |
873 | ||
78055998 | 874 | err = fib_table_delete(net, tb, &cfg, extack); |
4e902c57 TG |
875 | errout: |
876 | return err; | |
1da177e4 LT |
877 | } |
878 | ||
c21ef3e3 DA |
879 | static int inet_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, |
880 | struct netlink_ext_ack *extack) | |
1da177e4 | 881 | { |
3b1e0a65 | 882 | struct net *net = sock_net(skb->sk); |
4e902c57 TG |
883 | struct fib_config cfg; |
884 | struct fib_table *tb; | |
885 | int err; | |
1da177e4 | 886 | |
6d8422a1 | 887 | err = rtm_to_fib_config(net, skb, nlh, &cfg, extack); |
4e902c57 TG |
888 | if (err < 0) |
889 | goto errout; | |
1da177e4 | 890 | |
226b0b4a | 891 | tb = fib_new_table(net, cfg.fc_table); |
51456b29 | 892 | if (!tb) { |
4e902c57 TG |
893 | err = -ENOBUFS; |
894 | goto errout; | |
895 | } | |
896 | ||
6d8422a1 | 897 | err = fib_table_insert(net, tb, &cfg, extack); |
6e617de8 PA |
898 | if (!err && cfg.fc_type == RTN_LOCAL) |
899 | net->ipv4.fib_has_custom_local_routes = true; | |
4e902c57 TG |
900 | errout: |
901 | return err; | |
1da177e4 LT |
902 | } |
903 | ||
4724676d DA |
904 | int ip_valid_fib_dump_req(struct net *net, const struct nlmsghdr *nlh, |
905 | struct fib_dump_filter *filter, | |
effe6792 | 906 | struct netlink_callback *cb) |
e8ba330a | 907 | { |
effe6792 DA |
908 | struct netlink_ext_ack *extack = cb->extack; |
909 | struct nlattr *tb[RTA_MAX + 1]; | |
e8ba330a | 910 | struct rtmsg *rtm; |
effe6792 DA |
911 | int err, i; |
912 | ||
913 | ASSERT_RTNL(); | |
e8ba330a DA |
914 | |
915 | if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*rtm))) { | |
916 | NL_SET_ERR_MSG(extack, "Invalid header for FIB dump request"); | |
917 | return -EINVAL; | |
918 | } | |
919 | ||
920 | rtm = nlmsg_data(nlh); | |
921 | if (rtm->rtm_dst_len || rtm->rtm_src_len || rtm->rtm_tos || | |
effe6792 | 922 | rtm->rtm_scope) { |
e8ba330a DA |
923 | NL_SET_ERR_MSG(extack, "Invalid values in header for FIB dump request"); |
924 | return -EINVAL; | |
925 | } | |
564c91f7 | 926 | |
e8ba330a DA |
927 | if (rtm->rtm_flags & ~(RTM_F_CLONED | RTM_F_PREFIX)) { |
928 | NL_SET_ERR_MSG(extack, "Invalid flags for FIB dump request"); | |
929 | return -EINVAL; | |
930 | } | |
564c91f7 SB |
931 | if (rtm->rtm_flags & RTM_F_CLONED) |
932 | filter->dump_routes = false; | |
933 | else | |
934 | filter->dump_exceptions = false; | |
e8ba330a | 935 | |
effe6792 DA |
936 | filter->flags = rtm->rtm_flags; |
937 | filter->protocol = rtm->rtm_protocol; | |
938 | filter->rt_type = rtm->rtm_type; | |
939 | filter->table_id = rtm->rtm_table; | |
940 | ||
8cb08174 JB |
941 | err = nlmsg_parse_deprecated_strict(nlh, sizeof(*rtm), tb, RTA_MAX, |
942 | rtm_ipv4_policy, extack); | |
effe6792 DA |
943 | if (err < 0) |
944 | return err; | |
945 | ||
946 | for (i = 0; i <= RTA_MAX; ++i) { | |
947 | int ifindex; | |
948 | ||
949 | if (!tb[i]) | |
950 | continue; | |
951 | ||
952 | switch (i) { | |
953 | case RTA_TABLE: | |
954 | filter->table_id = nla_get_u32(tb[i]); | |
955 | break; | |
956 | case RTA_OIF: | |
957 | ifindex = nla_get_u32(tb[i]); | |
958 | filter->dev = __dev_get_by_index(net, ifindex); | |
959 | if (!filter->dev) | |
960 | return -ENODEV; | |
961 | break; | |
962 | default: | |
963 | NL_SET_ERR_MSG(extack, "Unsupported attribute in dump request"); | |
964 | return -EINVAL; | |
965 | } | |
966 | } | |
967 | ||
968 | if (filter->flags || filter->protocol || filter->rt_type || | |
969 | filter->table_id || filter->dev) { | |
970 | filter->filter_set = 1; | |
971 | cb->answer_flags = NLM_F_DUMP_FILTERED; | |
e8ba330a DA |
972 | } |
973 | ||
974 | return 0; | |
975 | } | |
976 | EXPORT_SYMBOL_GPL(ip_valid_fib_dump_req); | |
977 | ||
63f3444f | 978 | static int inet_dump_fib(struct sk_buff *skb, struct netlink_callback *cb) |
1da177e4 | 979 | { |
564c91f7 SB |
980 | struct fib_dump_filter filter = { .dump_routes = true, |
981 | .dump_exceptions = true }; | |
e8ba330a | 982 | const struct nlmsghdr *nlh = cb->nlh; |
3b1e0a65 | 983 | struct net *net = sock_net(skb->sk); |
1af5a8c4 PM |
984 | unsigned int h, s_h; |
985 | unsigned int e = 0, s_e; | |
1da177e4 | 986 | struct fib_table *tb; |
e4aef8ae | 987 | struct hlist_head *head; |
f6c5775f | 988 | int dumped = 0, err; |
1da177e4 | 989 | |
e8ba330a | 990 | if (cb->strict_check) { |
effe6792 | 991 | err = ip_valid_fib_dump_req(net, nlh, &filter, cb); |
e8ba330a DA |
992 | if (err < 0) |
993 | return err; | |
e4e92fb1 DA |
994 | } else if (nlmsg_len(nlh) >= sizeof(struct rtmsg)) { |
995 | struct rtmsg *rtm = nlmsg_data(nlh); | |
996 | ||
997 | filter.flags = rtm->rtm_flags & (RTM_F_PREFIX | RTM_F_CLONED); | |
e8ba330a DA |
998 | } |
999 | ||
b597ca6e SB |
1000 | /* ipv4 does not use prefix flag */ |
1001 | if (filter.flags & RTM_F_PREFIX) | |
0b8c7f6f | 1002 | return skb->len; |
1da177e4 | 1003 | |
18a8021a DA |
1004 | if (filter.table_id) { |
1005 | tb = fib_get_table(net, filter.table_id); | |
1006 | if (!tb) { | |
41b4bd98 | 1007 | if (rtnl_msg_family(cb->nlh) != PF_INET) |
ae677bbb DA |
1008 | return skb->len; |
1009 | ||
18a8021a DA |
1010 | NL_SET_ERR_MSG(cb->extack, "ipv4: FIB table does not exist"); |
1011 | return -ENOENT; | |
1012 | } | |
1013 | ||
dddeb30b | 1014 | rcu_read_lock(); |
18a8021a | 1015 | err = fib_table_dump(tb, skb, cb, &filter); |
dddeb30b | 1016 | rcu_read_unlock(); |
18a8021a DA |
1017 | return skb->len ? : err; |
1018 | } | |
1019 | ||
1af5a8c4 PM |
1020 | s_h = cb->args[0]; |
1021 | s_e = cb->args[1]; | |
1022 | ||
a7e53531 AD |
1023 | rcu_read_lock(); |
1024 | ||
1af5a8c4 PM |
1025 | for (h = s_h; h < FIB_TABLE_HASHSZ; h++, s_e = 0) { |
1026 | e = 0; | |
e4aef8ae | 1027 | head = &net->ipv4.fib_table_hash[h]; |
a7e53531 | 1028 | hlist_for_each_entry_rcu(tb, head, tb_hlist) { |
1af5a8c4 PM |
1029 | if (e < s_e) |
1030 | goto next; | |
1031 | if (dumped) | |
1032 | memset(&cb->args[2], 0, sizeof(cb->args) - | |
e905a9ed | 1033 | 2 * sizeof(cb->args[0])); |
18a8021a | 1034 | err = fib_table_dump(tb, skb, cb, &filter); |
f6c5775f DA |
1035 | if (err < 0) { |
1036 | if (likely(skb->len)) | |
1037 | goto out; | |
1038 | ||
1039 | goto out_err; | |
1040 | } | |
1af5a8c4 PM |
1041 | dumped = 1; |
1042 | next: | |
1043 | e++; | |
1044 | } | |
1da177e4 | 1045 | } |
1af5a8c4 | 1046 | out: |
f6c5775f DA |
1047 | err = skb->len; |
1048 | out_err: | |
a7e53531 AD |
1049 | rcu_read_unlock(); |
1050 | ||
1af5a8c4 PM |
1051 | cb->args[1] = e; |
1052 | cb->args[0] = h; | |
1da177e4 | 1053 | |
f6c5775f | 1054 | return err; |
1da177e4 LT |
1055 | } |
1056 | ||
1057 | /* Prepare and feed intra-kernel routing request. | |
6a31d2a9 ED |
1058 | * Really, it should be netlink message, but :-( netlink |
1059 | * can be not configured, so that we feed it directly | |
1060 | * to fib engine. It is legal, because all events occur | |
1061 | * only when netlink is already locked. | |
1da177e4 | 1062 | */ |
af4d768a DA |
1063 | static void fib_magic(int cmd, int type, __be32 dst, int dst_len, |
1064 | struct in_ifaddr *ifa, u32 rt_priority) | |
1da177e4 | 1065 | { |
c346dca1 | 1066 | struct net *net = dev_net(ifa->ifa_dev->dev); |
3236b004 | 1067 | u32 tb_id = l3mdev_fib_table(ifa->ifa_dev->dev); |
4e902c57 TG |
1068 | struct fib_table *tb; |
1069 | struct fib_config cfg = { | |
1070 | .fc_protocol = RTPROT_KERNEL, | |
1071 | .fc_type = type, | |
1072 | .fc_dst = dst, | |
1073 | .fc_dst_len = dst_len, | |
af4d768a | 1074 | .fc_priority = rt_priority, |
4e902c57 TG |
1075 | .fc_prefsrc = ifa->ifa_local, |
1076 | .fc_oif = ifa->ifa_dev->dev->ifindex, | |
1077 | .fc_nlflags = NLM_F_CREATE | NLM_F_APPEND, | |
4d1169c1 | 1078 | .fc_nlinfo = { |
4b5d47d4 | 1079 | .nl_net = net, |
4d1169c1 | 1080 | }, |
4e902c57 | 1081 | }; |
1da177e4 | 1082 | |
021dd3b8 DA |
1083 | if (!tb_id) |
1084 | tb_id = (type == RTN_UNICAST) ? RT_TABLE_MAIN : RT_TABLE_LOCAL; | |
1da177e4 | 1085 | |
021dd3b8 | 1086 | tb = fib_new_table(net, tb_id); |
51456b29 | 1087 | if (!tb) |
1da177e4 LT |
1088 | return; |
1089 | ||
4e902c57 | 1090 | cfg.fc_table = tb->tb_id; |
1da177e4 | 1091 | |
4e902c57 TG |
1092 | if (type != RTN_LOCAL) |
1093 | cfg.fc_scope = RT_SCOPE_LINK; | |
1094 | else | |
1095 | cfg.fc_scope = RT_SCOPE_HOST; | |
1da177e4 LT |
1096 | |
1097 | if (cmd == RTM_NEWROUTE) | |
6d8422a1 | 1098 | fib_table_insert(net, tb, &cfg, NULL); |
1da177e4 | 1099 | else |
78055998 | 1100 | fib_table_delete(net, tb, &cfg, NULL); |
1da177e4 LT |
1101 | } |
1102 | ||
0ff60a45 | 1103 | void fib_add_ifaddr(struct in_ifaddr *ifa) |
1da177e4 LT |
1104 | { |
1105 | struct in_device *in_dev = ifa->ifa_dev; | |
1106 | struct net_device *dev = in_dev->dev; | |
1107 | struct in_ifaddr *prim = ifa; | |
a144ea4b AV |
1108 | __be32 mask = ifa->ifa_mask; |
1109 | __be32 addr = ifa->ifa_local; | |
6a31d2a9 | 1110 | __be32 prefix = ifa->ifa_address & mask; |
1da177e4 | 1111 | |
6a31d2a9 | 1112 | if (ifa->ifa_flags & IFA_F_SECONDARY) { |
1da177e4 | 1113 | prim = inet_ifa_byprefix(in_dev, prefix, mask); |
51456b29 | 1114 | if (!prim) { |
058bd4d2 | 1115 | pr_warn("%s: bug: prim == NULL\n", __func__); |
1da177e4 LT |
1116 | return; |
1117 | } | |
1118 | } | |
1119 | ||
af4d768a | 1120 | fib_magic(RTM_NEWROUTE, RTN_LOCAL, addr, 32, prim, 0); |
1da177e4 | 1121 | |
6a31d2a9 | 1122 | if (!(dev->flags & IFF_UP)) |
1da177e4 LT |
1123 | return; |
1124 | ||
1125 | /* Add broadcast address, if it is explicitly assigned. */ | |
0c51e12e | 1126 | if (ifa->ifa_broadcast && ifa->ifa_broadcast != htonl(0xFFFFFFFF)) { |
af4d768a DA |
1127 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, |
1128 | prim, 0); | |
0c51e12e IS |
1129 | arp_invalidate(dev, ifa->ifa_broadcast, false); |
1130 | } | |
1da177e4 | 1131 | |
6a31d2a9 | 1132 | if (!ipv4_is_zeronet(prefix) && !(ifa->ifa_flags & IFA_F_SECONDARY) && |
1da177e4 | 1133 | (prefix != addr || ifa->ifa_prefixlen < 32)) { |
7b131180 PA |
1134 | if (!(ifa->ifa_flags & IFA_F_NOPREFIXROUTE)) |
1135 | fib_magic(RTM_NEWROUTE, | |
1136 | dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST, | |
af4d768a DA |
1137 | prefix, ifa->ifa_prefixlen, prim, |
1138 | ifa->ifa_rt_priority); | |
1da177e4 | 1139 | |
94c821c7 | 1140 | /* Add the network broadcast address, when it makes sense */ |
1da177e4 | 1141 | if (ifa->ifa_prefixlen < 31) { |
6a31d2a9 | 1142 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix | ~mask, |
af4d768a | 1143 | 32, prim, 0); |
0c51e12e | 1144 | arp_invalidate(dev, prefix | ~mask, false); |
1da177e4 LT |
1145 | } |
1146 | } | |
1147 | } | |
1148 | ||
af4d768a DA |
1149 | void fib_modify_prefix_metric(struct in_ifaddr *ifa, u32 new_metric) |
1150 | { | |
1151 | __be32 prefix = ifa->ifa_address & ifa->ifa_mask; | |
1152 | struct in_device *in_dev = ifa->ifa_dev; | |
1153 | struct net_device *dev = in_dev->dev; | |
1154 | ||
1155 | if (!(dev->flags & IFF_UP) || | |
1156 | ifa->ifa_flags & (IFA_F_SECONDARY | IFA_F_NOPREFIXROUTE) || | |
1157 | ipv4_is_zeronet(prefix) || | |
0b834ba0 | 1158 | (prefix == ifa->ifa_local && ifa->ifa_prefixlen == 32)) |
af4d768a DA |
1159 | return; |
1160 | ||
1161 | /* add the new */ | |
1162 | fib_magic(RTM_NEWROUTE, | |
1163 | dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST, | |
1164 | prefix, ifa->ifa_prefixlen, ifa, new_metric); | |
1165 | ||
1166 | /* delete the old */ | |
1167 | fib_magic(RTM_DELROUTE, | |
1168 | dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST, | |
1169 | prefix, ifa->ifa_prefixlen, ifa, ifa->ifa_rt_priority); | |
1170 | } | |
1171 | ||
e6abbaa2 JA |
1172 | /* Delete primary or secondary address. |
1173 | * Optionally, on secondary address promotion consider the addresses | |
1174 | * from subnet iprim as deleted, even if they are in device list. | |
1175 | * In this case the secondary ifa can be in device list. | |
1176 | */ | |
1177 | void fib_del_ifaddr(struct in_ifaddr *ifa, struct in_ifaddr *iprim) | |
1da177e4 LT |
1178 | { |
1179 | struct in_device *in_dev = ifa->ifa_dev; | |
1180 | struct net_device *dev = in_dev->dev; | |
1181 | struct in_ifaddr *ifa1; | |
e6abbaa2 | 1182 | struct in_ifaddr *prim = ifa, *prim1 = NULL; |
6a31d2a9 ED |
1183 | __be32 brd = ifa->ifa_address | ~ifa->ifa_mask; |
1184 | __be32 any = ifa->ifa_address & ifa->ifa_mask; | |
1da177e4 LT |
1185 | #define LOCAL_OK 1 |
1186 | #define BRD_OK 2 | |
1187 | #define BRD0_OK 4 | |
1188 | #define BRD1_OK 8 | |
95c96174 | 1189 | unsigned int ok = 0; |
e6abbaa2 JA |
1190 | int subnet = 0; /* Primary network */ |
1191 | int gone = 1; /* Address is missing */ | |
1192 | int same_prefsrc = 0; /* Another primary with same IP */ | |
1da177e4 | 1193 | |
e6abbaa2 | 1194 | if (ifa->ifa_flags & IFA_F_SECONDARY) { |
1da177e4 | 1195 | prim = inet_ifa_byprefix(in_dev, any, ifa->ifa_mask); |
51456b29 | 1196 | if (!prim) { |
391a2033 PA |
1197 | /* if the device has been deleted, we don't perform |
1198 | * address promotion | |
1199 | */ | |
1200 | if (!in_dev->dead) | |
1201 | pr_warn("%s: bug: prim == NULL\n", __func__); | |
1da177e4 LT |
1202 | return; |
1203 | } | |
e6abbaa2 | 1204 | if (iprim && iprim != prim) { |
058bd4d2 | 1205 | pr_warn("%s: bug: iprim != prim\n", __func__); |
e6abbaa2 JA |
1206 | return; |
1207 | } | |
1208 | } else if (!ipv4_is_zeronet(any) && | |
1209 | (any != ifa->ifa_local || ifa->ifa_prefixlen < 32)) { | |
7b131180 PA |
1210 | if (!(ifa->ifa_flags & IFA_F_NOPREFIXROUTE)) |
1211 | fib_magic(RTM_DELROUTE, | |
1212 | dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST, | |
af4d768a | 1213 | any, ifa->ifa_prefixlen, prim, 0); |
e6abbaa2 | 1214 | subnet = 1; |
1da177e4 LT |
1215 | } |
1216 | ||
fbd40ea0 DM |
1217 | if (in_dev->dead) |
1218 | goto no_promotions; | |
1219 | ||
1da177e4 | 1220 | /* Deletion is more complicated than add. |
6a31d2a9 ED |
1221 | * We should take care of not to delete too much :-) |
1222 | * | |
1223 | * Scan address list to be sure that addresses are really gone. | |
1da177e4 | 1224 | */ |
cd5a411d FW |
1225 | rcu_read_lock(); |
1226 | in_dev_for_each_ifa_rcu(ifa1, in_dev) { | |
e6abbaa2 JA |
1227 | if (ifa1 == ifa) { |
1228 | /* promotion, keep the IP */ | |
1229 | gone = 0; | |
1230 | continue; | |
1231 | } | |
1232 | /* Ignore IFAs from our subnet */ | |
1233 | if (iprim && ifa1->ifa_mask == iprim->ifa_mask && | |
1234 | inet_ifa_match(ifa1->ifa_address, iprim)) | |
1235 | continue; | |
1236 | ||
1237 | /* Ignore ifa1 if it uses different primary IP (prefsrc) */ | |
1238 | if (ifa1->ifa_flags & IFA_F_SECONDARY) { | |
1239 | /* Another address from our subnet? */ | |
1240 | if (ifa1->ifa_mask == prim->ifa_mask && | |
1241 | inet_ifa_match(ifa1->ifa_address, prim)) | |
1242 | prim1 = prim; | |
1243 | else { | |
1244 | /* We reached the secondaries, so | |
1245 | * same_prefsrc should be determined. | |
1246 | */ | |
1247 | if (!same_prefsrc) | |
1248 | continue; | |
1249 | /* Search new prim1 if ifa1 is not | |
1250 | * using the current prim1 | |
1251 | */ | |
1252 | if (!prim1 || | |
1253 | ifa1->ifa_mask != prim1->ifa_mask || | |
1254 | !inet_ifa_match(ifa1->ifa_address, prim1)) | |
1255 | prim1 = inet_ifa_byprefix(in_dev, | |
1256 | ifa1->ifa_address, | |
1257 | ifa1->ifa_mask); | |
1258 | if (!prim1) | |
1259 | continue; | |
1260 | if (prim1->ifa_local != prim->ifa_local) | |
1261 | continue; | |
1262 | } | |
1263 | } else { | |
1264 | if (prim->ifa_local != ifa1->ifa_local) | |
1265 | continue; | |
1266 | prim1 = ifa1; | |
1267 | if (prim != prim1) | |
1268 | same_prefsrc = 1; | |
1269 | } | |
1da177e4 LT |
1270 | if (ifa->ifa_local == ifa1->ifa_local) |
1271 | ok |= LOCAL_OK; | |
1272 | if (ifa->ifa_broadcast == ifa1->ifa_broadcast) | |
1273 | ok |= BRD_OK; | |
1274 | if (brd == ifa1->ifa_broadcast) | |
1275 | ok |= BRD1_OK; | |
1276 | if (any == ifa1->ifa_broadcast) | |
1277 | ok |= BRD0_OK; | |
e6abbaa2 JA |
1278 | /* primary has network specific broadcasts */ |
1279 | if (prim1 == ifa1 && ifa1->ifa_prefixlen < 31) { | |
1280 | __be32 brd1 = ifa1->ifa_address | ~ifa1->ifa_mask; | |
1281 | __be32 any1 = ifa1->ifa_address & ifa1->ifa_mask; | |
1282 | ||
1283 | if (!ipv4_is_zeronet(any1)) { | |
1284 | if (ifa->ifa_broadcast == brd1 || | |
1285 | ifa->ifa_broadcast == any1) | |
1286 | ok |= BRD_OK; | |
1287 | if (brd == brd1 || brd == any1) | |
1288 | ok |= BRD1_OK; | |
1289 | if (any == brd1 || any == any1) | |
1290 | ok |= BRD0_OK; | |
1291 | } | |
1292 | } | |
1da177e4 | 1293 | } |
cd5a411d | 1294 | rcu_read_unlock(); |
1da177e4 | 1295 | |
fbd40ea0 | 1296 | no_promotions: |
6a31d2a9 | 1297 | if (!(ok & BRD_OK)) |
af4d768a DA |
1298 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, |
1299 | prim, 0); | |
e6abbaa2 JA |
1300 | if (subnet && ifa->ifa_prefixlen < 31) { |
1301 | if (!(ok & BRD1_OK)) | |
af4d768a DA |
1302 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, brd, 32, |
1303 | prim, 0); | |
e6abbaa2 | 1304 | if (!(ok & BRD0_OK)) |
af4d768a DA |
1305 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, any, 32, |
1306 | prim, 0); | |
e6abbaa2 | 1307 | } |
6a31d2a9 | 1308 | if (!(ok & LOCAL_OK)) { |
30bbaa19 DA |
1309 | unsigned int addr_type; |
1310 | ||
af4d768a | 1311 | fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 32, prim, 0); |
1da177e4 LT |
1312 | |
1313 | /* Check, that this local address finally disappeared. */ | |
30bbaa19 DA |
1314 | addr_type = inet_addr_type_dev_table(dev_net(dev), dev, |
1315 | ifa->ifa_local); | |
1316 | if (gone && addr_type != RTN_LOCAL) { | |
1da177e4 | 1317 | /* And the last, but not the least thing. |
6a31d2a9 ED |
1318 | * We must flush stray FIB entries. |
1319 | * | |
1320 | * First of all, we scan fib_info list searching | |
1321 | * for stray nexthop entries, then ignite fib_flush. | |
1322 | */ | |
5a56a0b3 | 1323 | if (fib_sync_down_addr(dev, ifa->ifa_local)) |
c346dca1 | 1324 | fib_flush(dev_net(dev)); |
1da177e4 LT |
1325 | } |
1326 | } | |
1327 | #undef LOCAL_OK | |
1328 | #undef BRD_OK | |
1329 | #undef BRD0_OK | |
1330 | #undef BRD1_OK | |
1331 | } | |
1332 | ||
345e9b54 | 1333 | static void nl_fib_lookup(struct net *net, struct fib_result_nl *frn) |
246955fe | 1334 | { |
e905a9ed | 1335 | |
246955fe | 1336 | struct fib_result res; |
9ade2286 DM |
1337 | struct flowi4 fl4 = { |
1338 | .flowi4_mark = frn->fl_mark, | |
1339 | .daddr = frn->fl_addr, | |
1340 | .flowi4_tos = frn->fl_tos, | |
1341 | .flowi4_scope = frn->fl_scope, | |
6a31d2a9 | 1342 | }; |
345e9b54 AD |
1343 | struct fib_table *tb; |
1344 | ||
1345 | rcu_read_lock(); | |
1346 | ||
1347 | tb = fib_get_table(net, frn->tb_id_in); | |
1194ed0a AK |
1348 | |
1349 | frn->err = -ENOENT; | |
246955fe RO |
1350 | if (tb) { |
1351 | local_bh_disable(); | |
1352 | ||
1353 | frn->tb_id = tb->tb_id; | |
9ade2286 | 1354 | frn->err = fib_table_lookup(tb, &fl4, &res, FIB_LOOKUP_NOREF); |
246955fe RO |
1355 | |
1356 | if (!frn->err) { | |
1357 | frn->prefixlen = res.prefixlen; | |
1358 | frn->nh_sel = res.nh_sel; | |
1359 | frn->type = res.type; | |
1360 | frn->scope = res.scope; | |
1361 | } | |
1362 | local_bh_enable(); | |
1363 | } | |
345e9b54 AD |
1364 | |
1365 | rcu_read_unlock(); | |
246955fe RO |
1366 | } |
1367 | ||
28f7b036 | 1368 | static void nl_fib_input(struct sk_buff *skb) |
246955fe | 1369 | { |
6bd48fcf | 1370 | struct net *net; |
246955fe | 1371 | struct fib_result_nl *frn; |
28f7b036 | 1372 | struct nlmsghdr *nlh; |
15e47304 | 1373 | u32 portid; |
1194ed0a | 1374 | |
3b1e0a65 | 1375 | net = sock_net(skb->sk); |
b529ccf2 | 1376 | nlh = nlmsg_hdr(skb); |
c64c0b3c ED |
1377 | if (skb->len < nlmsg_total_size(sizeof(*frn)) || |
1378 | skb->len < nlh->nlmsg_len || | |
573ce260 | 1379 | nlmsg_len(nlh) < sizeof(*frn)) |
ea86575e | 1380 | return; |
d883a036 | 1381 | |
3a36515f | 1382 | skb = netlink_skb_clone(skb, GFP_KERNEL); |
51456b29 | 1383 | if (!skb) |
d883a036 DL |
1384 | return; |
1385 | nlh = nlmsg_hdr(skb); | |
e905a9ed | 1386 | |
2e47eece | 1387 | frn = nlmsg_data(nlh); |
345e9b54 | 1388 | nl_fib_lookup(net, frn); |
e905a9ed | 1389 | |
28a28283 | 1390 | portid = NETLINK_CB(skb).portid; /* netlink portid */ |
15e47304 | 1391 | NETLINK_CB(skb).portid = 0; /* from kernel */ |
ac6d439d | 1392 | NETLINK_CB(skb).dst_group = 0; /* unicast */ |
01757f53 | 1393 | nlmsg_unicast(net->ipv4.fibnl, skb, portid); |
e905a9ed | 1394 | } |
246955fe | 1395 | |
2c8c1e72 | 1396 | static int __net_init nl_fib_lookup_init(struct net *net) |
246955fe | 1397 | { |
6bd48fcf | 1398 | struct sock *sk; |
a31f2d17 PNA |
1399 | struct netlink_kernel_cfg cfg = { |
1400 | .input = nl_fib_input, | |
1401 | }; | |
1402 | ||
9f00d977 | 1403 | sk = netlink_kernel_create(net, NETLINK_FIB_LOOKUP, &cfg); |
51456b29 | 1404 | if (!sk) |
7b1a74fd | 1405 | return -EAFNOSUPPORT; |
6bd48fcf | 1406 | net->ipv4.fibnl = sk; |
7b1a74fd DL |
1407 | return 0; |
1408 | } | |
1409 | ||
1410 | static void nl_fib_lookup_exit(struct net *net) | |
1411 | { | |
b7c6ba6e | 1412 | netlink_kernel_release(net->ipv4.fibnl); |
775516bf | 1413 | net->ipv4.fibnl = NULL; |
246955fe RO |
1414 | } |
1415 | ||
4f823def JA |
1416 | static void fib_disable_ip(struct net_device *dev, unsigned long event, |
1417 | bool force) | |
1da177e4 | 1418 | { |
4f823def | 1419 | if (fib_sync_down_dev(dev, event, force)) |
c346dca1 | 1420 | fib_flush(dev_net(dev)); |
06b4fc52 GF |
1421 | else |
1422 | rt_cache_flush(dev_net(dev)); | |
1da177e4 LT |
1423 | arp_ifdown(dev); |
1424 | } | |
1425 | ||
1426 | static int fib_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1427 | { | |
2e47eece | 1428 | struct in_ifaddr *ifa = ptr; |
76e6ebfb | 1429 | struct net_device *dev = ifa->ifa_dev->dev; |
436c3b66 | 1430 | struct net *net = dev_net(dev); |
1da177e4 LT |
1431 | |
1432 | switch (event) { | |
1433 | case NETDEV_UP: | |
1434 | fib_add_ifaddr(ifa); | |
1435 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
8a3d0316 | 1436 | fib_sync_up(dev, RTNH_F_DEAD); |
1da177e4 | 1437 | #endif |
436c3b66 | 1438 | atomic_inc(&net->ipv4.dev_addr_genid); |
4ccfe6d4 | 1439 | rt_cache_flush(dev_net(dev)); |
1da177e4 LT |
1440 | break; |
1441 | case NETDEV_DOWN: | |
e6abbaa2 | 1442 | fib_del_ifaddr(ifa, NULL); |
436c3b66 | 1443 | atomic_inc(&net->ipv4.dev_addr_genid); |
51456b29 | 1444 | if (!ifa->ifa_dev->ifa_list) { |
1da177e4 | 1445 | /* Last address was deleted from this interface. |
6a31d2a9 | 1446 | * Disable IP. |
1da177e4 | 1447 | */ |
4f823def | 1448 | fib_disable_ip(dev, event, true); |
1da177e4 | 1449 | } else { |
4ccfe6d4 | 1450 | rt_cache_flush(dev_net(dev)); |
1da177e4 LT |
1451 | } |
1452 | break; | |
1453 | } | |
1454 | return NOTIFY_DONE; | |
1455 | } | |
1456 | ||
1457 | static int fib_netdev_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1458 | { | |
351638e7 | 1459 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
af7d6cce SD |
1460 | struct netdev_notifier_changeupper_info *upper_info = ptr; |
1461 | struct netdev_notifier_info_ext *info_ext = ptr; | |
0115e8e3 | 1462 | struct in_device *in_dev; |
436c3b66 | 1463 | struct net *net = dev_net(dev); |
cd5a411d | 1464 | struct in_ifaddr *ifa; |
8a3d0316 | 1465 | unsigned int flags; |
1da177e4 LT |
1466 | |
1467 | if (event == NETDEV_UNREGISTER) { | |
4f823def | 1468 | fib_disable_ip(dev, event, true); |
caacf05e | 1469 | rt_flush_dev(dev); |
1da177e4 LT |
1470 | return NOTIFY_DONE; |
1471 | } | |
1472 | ||
0115e8e3 | 1473 | in_dev = __in_dev_get_rtnl(dev); |
a0065f26 OH |
1474 | if (!in_dev) |
1475 | return NOTIFY_DONE; | |
0115e8e3 | 1476 | |
1da177e4 LT |
1477 | switch (event) { |
1478 | case NETDEV_UP: | |
cd5a411d | 1479 | in_dev_for_each_ifa_rtnl(ifa, in_dev) { |
1da177e4 | 1480 | fib_add_ifaddr(ifa); |
cd5a411d | 1481 | } |
1da177e4 | 1482 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
8a3d0316 | 1483 | fib_sync_up(dev, RTNH_F_DEAD); |
1da177e4 | 1484 | #endif |
436c3b66 | 1485 | atomic_inc(&net->ipv4.dev_addr_genid); |
4ccfe6d4 | 1486 | rt_cache_flush(net); |
1da177e4 LT |
1487 | break; |
1488 | case NETDEV_DOWN: | |
4f823def | 1489 | fib_disable_ip(dev, event, false); |
1da177e4 | 1490 | break; |
1da177e4 | 1491 | case NETDEV_CHANGE: |
8a3d0316 AG |
1492 | flags = dev_get_flags(dev); |
1493 | if (flags & (IFF_RUNNING | IFF_LOWER_UP)) | |
1494 | fib_sync_up(dev, RTNH_F_LINKDOWN); | |
1495 | else | |
4f823def | 1496 | fib_sync_down_dev(dev, event, false); |
af7d6cce SD |
1497 | rt_cache_flush(net); |
1498 | break; | |
8a3d0316 | 1499 | case NETDEV_CHANGEMTU: |
af7d6cce | 1500 | fib_sync_mtu(dev, info_ext->ext.mtu); |
4ccfe6d4 | 1501 | rt_cache_flush(net); |
1da177e4 | 1502 | break; |
7f49e7a3 | 1503 | case NETDEV_CHANGEUPPER: |
af7d6cce | 1504 | upper_info = ptr; |
7f49e7a3 DA |
1505 | /* flush all routes if dev is linked to or unlinked from |
1506 | * an L3 master device (e.g., VRF) | |
1507 | */ | |
af7d6cce SD |
1508 | if (upper_info->upper_dev && |
1509 | netif_is_l3_master(upper_info->upper_dev)) | |
7f49e7a3 DA |
1510 | fib_disable_ip(dev, NETDEV_DOWN, true); |
1511 | break; | |
1da177e4 LT |
1512 | } |
1513 | return NOTIFY_DONE; | |
1514 | } | |
1515 | ||
1516 | static struct notifier_block fib_inetaddr_notifier = { | |
6ed2533e | 1517 | .notifier_call = fib_inetaddr_event, |
1da177e4 LT |
1518 | }; |
1519 | ||
1520 | static struct notifier_block fib_netdev_notifier = { | |
6ed2533e | 1521 | .notifier_call = fib_netdev_event, |
1da177e4 LT |
1522 | }; |
1523 | ||
7b1a74fd | 1524 | static int __net_init ip_fib_net_init(struct net *net) |
1da177e4 | 1525 | { |
dce5cbee | 1526 | int err; |
10da66f7 ED |
1527 | size_t size = sizeof(struct hlist_head) * FIB_TABLE_HASHSZ; |
1528 | ||
04b1d4e5 IS |
1529 | err = fib4_notifier_init(net); |
1530 | if (err) | |
1531 | return err; | |
cacaad11 | 1532 | |
ce5c9c20 IS |
1533 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
1534 | /* Default to 3-tuple */ | |
1535 | net->ipv4.sysctl_fib_multipath_hash_fields = | |
1536 | FIB_MULTIPATH_HASH_FIELD_DEFAULT_MASK; | |
1537 | #endif | |
1538 | ||
10da66f7 ED |
1539 | /* Avoid false sharing : Use at least a full cache line */ |
1540 | size = max_t(size_t, size, L1_CACHE_BYTES); | |
1af5a8c4 | 1541 | |
10da66f7 | 1542 | net->ipv4.fib_table_hash = kzalloc(size, GFP_KERNEL); |
04b1d4e5 IS |
1543 | if (!net->ipv4.fib_table_hash) { |
1544 | err = -ENOMEM; | |
1545 | goto err_table_hash_alloc; | |
1546 | } | |
e4aef8ae | 1547 | |
dce5cbee DL |
1548 | err = fib4_rules_init(net); |
1549 | if (err < 0) | |
04b1d4e5 | 1550 | goto err_rules_init; |
dce5cbee DL |
1551 | return 0; |
1552 | ||
04b1d4e5 | 1553 | err_rules_init: |
dce5cbee | 1554 | kfree(net->ipv4.fib_table_hash); |
04b1d4e5 IS |
1555 | err_table_hash_alloc: |
1556 | fib4_notifier_exit(net); | |
dce5cbee | 1557 | return err; |
7b1a74fd | 1558 | } |
1da177e4 | 1559 | |
2c8c1e72 | 1560 | static void ip_fib_net_exit(struct net *net) |
7b1a74fd | 1561 | { |
b4681c28 | 1562 | int i; |
7b1a74fd | 1563 | |
1c695764 | 1564 | ASSERT_RTNL(); |
6e47d6ca | 1565 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
6e47d6ca AD |
1566 | RCU_INIT_POINTER(net->ipv4.fib_main, NULL); |
1567 | RCU_INIT_POINTER(net->ipv4.fib_default, NULL); | |
1568 | #endif | |
b4681c28 IS |
1569 | /* Destroy the tables in reverse order to guarantee that the |
1570 | * local table, ID 255, is destroyed before the main table, ID | |
1571 | * 254. This is necessary as the local table may contain | |
1572 | * references to data contained in the main table. | |
1573 | */ | |
1574 | for (i = FIB_TABLE_HASHSZ - 1; i >= 0; i--) { | |
a7e53531 | 1575 | struct hlist_head *head = &net->ipv4.fib_table_hash[i]; |
b67bfe0d | 1576 | struct hlist_node *tmp; |
a7e53531 AD |
1577 | struct fib_table *tb; |
1578 | ||
b67bfe0d SL |
1579 | hlist_for_each_entry_safe(tb, tmp, head, tb_hlist) { |
1580 | hlist_del(&tb->tb_hlist); | |
f97f4dd8 | 1581 | fib_table_flush(net, tb, true); |
4aa2c466 | 1582 | fib_free_table(tb); |
7b1a74fd DL |
1583 | } |
1584 | } | |
ad88d051 AD |
1585 | |
1586 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
1587 | fib4_rules_exit(net); | |
1588 | #endif | |
1c695764 | 1589 | |
e4aef8ae | 1590 | kfree(net->ipv4.fib_table_hash); |
04b1d4e5 | 1591 | fib4_notifier_exit(net); |
7b1a74fd DL |
1592 | } |
1593 | ||
1594 | static int __net_init fib_net_init(struct net *net) | |
1595 | { | |
1596 | int error; | |
1597 | ||
f4530fa5 | 1598 | #ifdef CONFIG_IP_ROUTE_CLASSID |
213f5f8f | 1599 | atomic_set(&net->ipv4.fib_num_tclassid_users, 0); |
f4530fa5 | 1600 | #endif |
7b1a74fd DL |
1601 | error = ip_fib_net_init(net); |
1602 | if (error < 0) | |
1603 | goto out; | |
1604 | error = nl_fib_lookup_init(net); | |
1605 | if (error < 0) | |
1606 | goto out_nlfl; | |
1607 | error = fib_proc_init(net); | |
1608 | if (error < 0) | |
1609 | goto out_proc; | |
1610 | out: | |
1611 | return error; | |
1612 | ||
1613 | out_proc: | |
1614 | nl_fib_lookup_exit(net); | |
1615 | out_nlfl: | |
1c695764 | 1616 | rtnl_lock(); |
7b1a74fd | 1617 | ip_fib_net_exit(net); |
1c695764 | 1618 | rtnl_unlock(); |
7b1a74fd DL |
1619 | goto out; |
1620 | } | |
1621 | ||
1622 | static void __net_exit fib_net_exit(struct net *net) | |
1623 | { | |
1624 | fib_proc_exit(net); | |
1625 | nl_fib_lookup_exit(net); | |
1c695764 ED |
1626 | } |
1627 | ||
1628 | static void __net_exit fib_net_exit_batch(struct list_head *net_list) | |
1629 | { | |
1630 | struct net *net; | |
1631 | ||
1632 | rtnl_lock(); | |
1633 | list_for_each_entry(net, net_list, exit_list) | |
1634 | ip_fib_net_exit(net); | |
1635 | ||
1636 | rtnl_unlock(); | |
7b1a74fd DL |
1637 | } |
1638 | ||
1639 | static struct pernet_operations fib_net_ops = { | |
1640 | .init = fib_net_init, | |
1641 | .exit = fib_net_exit, | |
1c695764 | 1642 | .exit_batch = fib_net_exit_batch, |
7b1a74fd DL |
1643 | }; |
1644 | ||
1645 | void __init ip_fib_init(void) | |
1646 | { | |
8799a221 | 1647 | fib_trie_init(); |
7b1a74fd DL |
1648 | |
1649 | register_pernet_subsys(&fib_net_ops); | |
8799a221 | 1650 | |
7b1a74fd DL |
1651 | register_netdevice_notifier(&fib_netdev_notifier); |
1652 | register_inetaddr_notifier(&fib_inetaddr_notifier); | |
7f9b8052 | 1653 | |
b97bac64 FW |
1654 | rtnl_register(PF_INET, RTM_NEWROUTE, inet_rtm_newroute, NULL, 0); |
1655 | rtnl_register(PF_INET, RTM_DELROUTE, inet_rtm_delroute, NULL, 0); | |
1656 | rtnl_register(PF_INET, RTM_GETROUTE, NULL, inet_dump_fib, 0); | |
1da177e4 | 1657 | } |