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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * INET An implementation of the TCP/IP protocol suite for the LINUX | |
3 | * operating system. INET is implemented using the BSD Socket | |
4 | * interface as the means of communication with the user level. | |
5 | * | |
6 | * IPv4 Forwarding Information Base: FIB frontend. | |
7 | * | |
1da177e4 LT |
8 | * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> |
9 | * | |
10 | * This program is free software; you can redistribute it and/or | |
11 | * modify it under the terms of the GNU General Public License | |
12 | * as published by the Free Software Foundation; either version | |
13 | * 2 of the License, or (at your option) any later version. | |
14 | */ | |
15 | ||
1da177e4 | 16 | #include <linux/module.h> |
7c0f6ba6 | 17 | #include <linux/uaccess.h> |
1da177e4 | 18 | #include <linux/bitops.h> |
4fc268d2 | 19 | #include <linux/capability.h> |
1da177e4 LT |
20 | #include <linux/types.h> |
21 | #include <linux/kernel.h> | |
1da177e4 LT |
22 | #include <linux/mm.h> |
23 | #include <linux/string.h> | |
24 | #include <linux/socket.h> | |
25 | #include <linux/sockios.h> | |
26 | #include <linux/errno.h> | |
27 | #include <linux/in.h> | |
28 | #include <linux/inet.h> | |
14c85021 | 29 | #include <linux/inetdevice.h> |
1da177e4 | 30 | #include <linux/netdevice.h> |
1823730f | 31 | #include <linux/if_addr.h> |
1da177e4 LT |
32 | #include <linux/if_arp.h> |
33 | #include <linux/skbuff.h> | |
7a9bc9b8 | 34 | #include <linux/cache.h> |
1da177e4 | 35 | #include <linux/init.h> |
1af5a8c4 | 36 | #include <linux/list.h> |
5a0e3ad6 | 37 | #include <linux/slab.h> |
1da177e4 LT |
38 | |
39 | #include <net/ip.h> | |
40 | #include <net/protocol.h> | |
41 | #include <net/route.h> | |
42 | #include <net/tcp.h> | |
43 | #include <net/sock.h> | |
1da177e4 LT |
44 | #include <net/arp.h> |
45 | #include <net/ip_fib.h> | |
63f3444f | 46 | #include <net/rtnetlink.h> |
990078af | 47 | #include <net/xfrm.h> |
385add90 | 48 | #include <net/l3mdev.h> |
9ed59592 | 49 | #include <net/lwtunnel.h> |
f6d3c192 | 50 | #include <trace/events/fib.h> |
1da177e4 | 51 | |
1da177e4 LT |
52 | #ifndef CONFIG_IP_MULTIPLE_TABLES |
53 | ||
7b1a74fd | 54 | static int __net_init fib4_rules_init(struct net *net) |
c3e9a353 | 55 | { |
93456b6d DL |
56 | struct fib_table *local_table, *main_table; |
57 | ||
0ddcf43d | 58 | main_table = fib_trie_table(RT_TABLE_MAIN, NULL); |
51456b29 | 59 | if (!main_table) |
61f0d861 | 60 | return -ENOMEM; |
dbb50165 | 61 | |
0ddcf43d | 62 | local_table = fib_trie_table(RT_TABLE_LOCAL, main_table); |
51456b29 | 63 | if (!local_table) |
61f0d861 | 64 | goto fail; |
0ddcf43d | 65 | |
93456b6d | 66 | hlist_add_head_rcu(&local_table->tb_hlist, |
e4aef8ae | 67 | &net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX]); |
93456b6d | 68 | hlist_add_head_rcu(&main_table->tb_hlist, |
e4aef8ae | 69 | &net->ipv4.fib_table_hash[TABLE_MAIN_INDEX]); |
dbb50165 DL |
70 | return 0; |
71 | ||
72 | fail: | |
61f0d861 | 73 | fib_free_table(main_table); |
dbb50165 | 74 | return -ENOMEM; |
c3e9a353 | 75 | } |
1af5a8c4 | 76 | #else |
1da177e4 | 77 | |
8ad4942c | 78 | struct fib_table *fib_new_table(struct net *net, u32 id) |
1da177e4 | 79 | { |
0ddcf43d | 80 | struct fib_table *tb, *alias = NULL; |
1af5a8c4 | 81 | unsigned int h; |
1da177e4 | 82 | |
1af5a8c4 PM |
83 | if (id == 0) |
84 | id = RT_TABLE_MAIN; | |
8ad4942c | 85 | tb = fib_get_table(net, id); |
1af5a8c4 PM |
86 | if (tb) |
87 | return tb; | |
7f9b8052 | 88 | |
5350d54f | 89 | if (id == RT_TABLE_LOCAL && !net->ipv4.fib_has_custom_rules) |
0ddcf43d AD |
90 | alias = fib_new_table(net, RT_TABLE_MAIN); |
91 | ||
92 | tb = fib_trie_table(id, alias); | |
1da177e4 LT |
93 | if (!tb) |
94 | return NULL; | |
f4530fa5 DM |
95 | |
96 | switch (id) { | |
f4530fa5 | 97 | case RT_TABLE_MAIN: |
a7e53531 | 98 | rcu_assign_pointer(net->ipv4.fib_main, tb); |
f4530fa5 | 99 | break; |
f4530fa5 | 100 | case RT_TABLE_DEFAULT: |
a7e53531 | 101 | rcu_assign_pointer(net->ipv4.fib_default, tb); |
f4530fa5 | 102 | break; |
f4530fa5 DM |
103 | default: |
104 | break; | |
105 | } | |
106 | ||
1af5a8c4 | 107 | h = id & (FIB_TABLE_HASHSZ - 1); |
e4aef8ae | 108 | hlist_add_head_rcu(&tb->tb_hlist, &net->ipv4.fib_table_hash[h]); |
1da177e4 LT |
109 | return tb; |
110 | } | |
b3b4663c | 111 | EXPORT_SYMBOL_GPL(fib_new_table); |
1da177e4 | 112 | |
345e9b54 | 113 | /* caller must hold either rtnl or rcu read lock */ |
8ad4942c | 114 | struct fib_table *fib_get_table(struct net *net, u32 id) |
1af5a8c4 PM |
115 | { |
116 | struct fib_table *tb; | |
e4aef8ae | 117 | struct hlist_head *head; |
1af5a8c4 | 118 | unsigned int h; |
1da177e4 | 119 | |
1af5a8c4 PM |
120 | if (id == 0) |
121 | id = RT_TABLE_MAIN; | |
122 | h = id & (FIB_TABLE_HASHSZ - 1); | |
e4aef8ae | 123 | |
e4aef8ae | 124 | head = &net->ipv4.fib_table_hash[h]; |
b67bfe0d | 125 | hlist_for_each_entry_rcu(tb, head, tb_hlist) { |
345e9b54 | 126 | if (tb->tb_id == id) |
1af5a8c4 | 127 | return tb; |
1af5a8c4 | 128 | } |
1af5a8c4 PM |
129 | return NULL; |
130 | } | |
1da177e4 LT |
131 | #endif /* CONFIG_IP_MULTIPLE_TABLES */ |
132 | ||
0ddcf43d AD |
133 | static void fib_replace_table(struct net *net, struct fib_table *old, |
134 | struct fib_table *new) | |
135 | { | |
136 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
137 | switch (new->tb_id) { | |
0ddcf43d AD |
138 | case RT_TABLE_MAIN: |
139 | rcu_assign_pointer(net->ipv4.fib_main, new); | |
140 | break; | |
141 | case RT_TABLE_DEFAULT: | |
142 | rcu_assign_pointer(net->ipv4.fib_default, new); | |
143 | break; | |
144 | default: | |
145 | break; | |
146 | } | |
147 | ||
148 | #endif | |
149 | /* replace the old table in the hlist */ | |
150 | hlist_replace_rcu(&old->tb_hlist, &new->tb_hlist); | |
151 | } | |
152 | ||
153 | int fib_unmerge(struct net *net) | |
154 | { | |
3b709334 | 155 | struct fib_table *old, *new, *main_table; |
0ddcf43d | 156 | |
3c9e9f73 | 157 | /* attempt to fetch local table if it has been allocated */ |
0ddcf43d | 158 | old = fib_get_table(net, RT_TABLE_LOCAL); |
3c9e9f73 AD |
159 | if (!old) |
160 | return 0; | |
0ddcf43d | 161 | |
3c9e9f73 | 162 | new = fib_trie_unmerge(old); |
0ddcf43d AD |
163 | if (!new) |
164 | return -ENOMEM; | |
165 | ||
3b709334 AD |
166 | /* table is already unmerged */ |
167 | if (new == old) | |
168 | return 0; | |
169 | ||
0ddcf43d | 170 | /* replace merged table with clean table */ |
3b709334 AD |
171 | fib_replace_table(net, old, new); |
172 | fib_free_table(old); | |
173 | ||
174 | /* attempt to fetch main table if it has been allocated */ | |
175 | main_table = fib_get_table(net, RT_TABLE_MAIN); | |
176 | if (!main_table) | |
177 | return 0; | |
178 | ||
179 | /* flush local entries from main table */ | |
180 | fib_table_flush_external(main_table); | |
0ddcf43d AD |
181 | |
182 | return 0; | |
183 | } | |
184 | ||
e4aef8ae | 185 | static void fib_flush(struct net *net) |
1da177e4 LT |
186 | { |
187 | int flushed = 0; | |
1af5a8c4 | 188 | unsigned int h; |
1da177e4 | 189 | |
1af5a8c4 | 190 | for (h = 0; h < FIB_TABLE_HASHSZ; h++) { |
a7e53531 AD |
191 | struct hlist_head *head = &net->ipv4.fib_table_hash[h]; |
192 | struct hlist_node *tmp; | |
193 | struct fib_table *tb; | |
194 | ||
195 | hlist_for_each_entry_safe(tb, tmp, head, tb_hlist) | |
b90eb754 | 196 | flushed += fib_table_flush(net, tb); |
1da177e4 | 197 | } |
1da177e4 LT |
198 | |
199 | if (flushed) | |
4ccfe6d4 | 200 | rt_cache_flush(net); |
1da177e4 LT |
201 | } |
202 | ||
05538116 LAT |
203 | /* |
204 | * Find address type as if only "dev" was present in the system. If | |
205 | * on_dev is NULL then all interfaces are taken into consideration. | |
206 | */ | |
95c96174 ED |
207 | static inline unsigned int __inet_dev_addr_type(struct net *net, |
208 | const struct net_device *dev, | |
9b8ff518 | 209 | __be32 addr, u32 tb_id) |
1da177e4 | 210 | { |
9ade2286 | 211 | struct flowi4 fl4 = { .daddr = addr }; |
1da177e4 | 212 | struct fib_result res; |
95c96174 | 213 | unsigned int ret = RTN_BROADCAST; |
15be405e | 214 | struct fib_table *table; |
1da177e4 | 215 | |
1e637c74 | 216 | if (ipv4_is_zeronet(addr) || ipv4_is_lbcast(addr)) |
1da177e4 | 217 | return RTN_BROADCAST; |
f97c1e0c | 218 | if (ipv4_is_multicast(addr)) |
1da177e4 LT |
219 | return RTN_MULTICAST; |
220 | ||
345e9b54 AD |
221 | rcu_read_lock(); |
222 | ||
15be405e DA |
223 | table = fib_get_table(net, tb_id); |
224 | if (table) { | |
1da177e4 | 225 | ret = RTN_UNICAST; |
15be405e | 226 | if (!fib_table_lookup(table, &fl4, &res, FIB_LOOKUP_NOREF)) { |
05538116 LAT |
227 | if (!dev || dev == res.fi->fib_dev) |
228 | ret = res.type; | |
1da177e4 LT |
229 | } |
230 | } | |
345e9b54 AD |
231 | |
232 | rcu_read_unlock(); | |
1da177e4 LT |
233 | return ret; |
234 | } | |
235 | ||
9b8ff518 | 236 | unsigned int inet_addr_type_table(struct net *net, __be32 addr, u32 tb_id) |
15be405e DA |
237 | { |
238 | return __inet_dev_addr_type(net, NULL, addr, tb_id); | |
239 | } | |
240 | EXPORT_SYMBOL(inet_addr_type_table); | |
241 | ||
6b175b26 | 242 | unsigned int inet_addr_type(struct net *net, __be32 addr) |
05538116 | 243 | { |
15be405e | 244 | return __inet_dev_addr_type(net, NULL, addr, RT_TABLE_LOCAL); |
05538116 | 245 | } |
4bc2f18b | 246 | EXPORT_SYMBOL(inet_addr_type); |
05538116 | 247 | |
6b175b26 EB |
248 | unsigned int inet_dev_addr_type(struct net *net, const struct net_device *dev, |
249 | __be32 addr) | |
05538116 | 250 | { |
3236b004 | 251 | u32 rt_table = l3mdev_fib_table(dev) ? : RT_TABLE_LOCAL; |
15be405e DA |
252 | |
253 | return __inet_dev_addr_type(net, dev, addr, rt_table); | |
05538116 | 254 | } |
4bc2f18b | 255 | EXPORT_SYMBOL(inet_dev_addr_type); |
05538116 | 256 | |
30bbaa19 DA |
257 | /* inet_addr_type with dev == NULL but using the table from a dev |
258 | * if one is associated | |
259 | */ | |
260 | unsigned int inet_addr_type_dev_table(struct net *net, | |
261 | const struct net_device *dev, | |
262 | __be32 addr) | |
263 | { | |
3236b004 | 264 | u32 rt_table = l3mdev_fib_table(dev) ? : RT_TABLE_LOCAL; |
30bbaa19 DA |
265 | |
266 | return __inet_dev_addr_type(net, NULL, addr, rt_table); | |
267 | } | |
268 | EXPORT_SYMBOL(inet_addr_type_dev_table); | |
269 | ||
35ebf65e DM |
270 | __be32 fib_compute_spec_dst(struct sk_buff *skb) |
271 | { | |
272 | struct net_device *dev = skb->dev; | |
273 | struct in_device *in_dev; | |
274 | struct fib_result res; | |
a207a4b2 | 275 | struct rtable *rt; |
35ebf65e | 276 | struct net *net; |
a207a4b2 | 277 | int scope; |
35ebf65e | 278 | |
a207a4b2 | 279 | rt = skb_rtable(skb); |
0cc535a2 JA |
280 | if ((rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST | RTCF_LOCAL)) == |
281 | RTCF_LOCAL) | |
35ebf65e DM |
282 | return ip_hdr(skb)->daddr; |
283 | ||
284 | in_dev = __in_dev_get_rcu(dev); | |
285 | BUG_ON(!in_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)) { | |
4cfc86f3 LR |
291 | struct flowi4 fl4 = { |
292 | .flowi4_iif = LOOPBACK_IFINDEX, | |
293 | .daddr = ip_hdr(skb)->saddr, | |
294 | .flowi4_tos = RT_TOS(ip_hdr(skb)->tos), | |
295 | .flowi4_scope = scope, | |
296 | .flowi4_mark = IN_DEV_SRC_VMARK(in_dev) ? skb->mark : 0, | |
297 | }; | |
0eeb075f | 298 | if (!fib_lookup(net, &fl4, &res, 0)) |
a207a4b2 DM |
299 | return FIB_RES_PREFSRC(net, res); |
300 | } else { | |
301 | scope = RT_SCOPE_LINK; | |
302 | } | |
303 | ||
304 | return inet_select_addr(dev, ip_hdr(skb)->saddr, scope); | |
35ebf65e DM |
305 | } |
306 | ||
1da177e4 | 307 | /* Given (packet source, input interface) and optional (dst, oif, tos): |
6a31d2a9 ED |
308 | * - (main) check, that source is valid i.e. not broadcast or our local |
309 | * address. | |
310 | * - figure out what "logical" interface this packet arrived | |
311 | * and calculate "specific destination" address. | |
312 | * - check, that packet arrived from expected physical interface. | |
ebc0ffae | 313 | * called with rcu_read_lock() |
1da177e4 | 314 | */ |
7a9bc9b8 DM |
315 | static int __fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst, |
316 | u8 tos, int oif, struct net_device *dev, | |
317 | int rpf, struct in_device *idev, u32 *itag) | |
1da177e4 | 318 | { |
1dced6a8 | 319 | int ret, no_addr; |
1da177e4 | 320 | struct fib_result res; |
9e56e380 | 321 | struct flowi4 fl4; |
8bcfd092 | 322 | struct net *net = dev_net(dev); |
9e56e380 | 323 | bool dev_match; |
1da177e4 | 324 | |
9ade2286 | 325 | fl4.flowi4_oif = 0; |
385add90 | 326 | fl4.flowi4_iif = l3mdev_master_ifindex_rcu(dev); |
cd2fbe1b DA |
327 | if (!fl4.flowi4_iif) |
328 | fl4.flowi4_iif = oif ? : LOOPBACK_IFINDEX; | |
9ade2286 DM |
329 | fl4.daddr = src; |
330 | fl4.saddr = dst; | |
331 | fl4.flowi4_tos = tos; | |
332 | fl4.flowi4_scope = RT_SCOPE_UNIVERSE; | |
1b7179d3 | 333 | fl4.flowi4_tun_key.tun_id = 0; |
b84f7878 | 334 | fl4.flowi4_flags = 0; |
8bcfd092 | 335 | fl4.flowi4_uid = sock_net_uid(net, NULL); |
cc7e17ea | 336 | |
9e56e380 | 337 | no_addr = idev->ifa_list == NULL; |
990078af | 338 | |
9e56e380 | 339 | fl4.flowi4_mark = IN_DEV_SRC_VMARK(idev) ? skb->mark : 0; |
1da177e4 | 340 | |
f6d3c192 DA |
341 | trace_fib_validate_source(dev, &fl4); |
342 | ||
0eeb075f | 343 | if (fib_lookup(net, &fl4, &res, 0)) |
1da177e4 | 344 | goto last_resort; |
1dced6a8 SB |
345 | if (res.type != RTN_UNICAST && |
346 | (res.type != RTN_LOCAL || !IN_DEV_ACCEPT_LOCAL(idev))) | |
347 | goto e_inval; | |
8bcfd092 | 348 | if (!rpf && !fib_num_tclassid_users(net) && |
1dced6a8 SB |
349 | (dev->ifindex != oif || !IN_DEV_TX_REDIRECTS(idev))) |
350 | goto last_resort; | |
1da177e4 | 351 | fib_combine_itag(itag, &res); |
6f86b325 DM |
352 | dev_match = false; |
353 | ||
1da177e4 | 354 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
6f86b325 DM |
355 | for (ret = 0; ret < res.fi->fib_nhs; ret++) { |
356 | struct fib_nh *nh = &res.fi->fib_nh[ret]; | |
357 | ||
358 | if (nh->nh_dev == dev) { | |
359 | dev_match = true; | |
360 | break; | |
385add90 | 361 | } else if (l3mdev_master_ifindex_rcu(nh->nh_dev) == dev->ifindex) { |
cd2fbe1b DA |
362 | dev_match = true; |
363 | break; | |
6f86b325 DM |
364 | } |
365 | } | |
1da177e4 LT |
366 | #else |
367 | if (FIB_RES_DEV(res) == dev) | |
6f86b325 | 368 | dev_match = true; |
1da177e4 | 369 | #endif |
6f86b325 | 370 | if (dev_match) { |
1da177e4 | 371 | ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST; |
1da177e4 LT |
372 | return ret; |
373 | } | |
1da177e4 LT |
374 | if (no_addr) |
375 | goto last_resort; | |
c1cf8422 | 376 | if (rpf == 1) |
b5f7e755 | 377 | goto e_rpf; |
9ade2286 | 378 | fl4.flowi4_oif = dev->ifindex; |
1da177e4 LT |
379 | |
380 | ret = 0; | |
0eeb075f | 381 | if (fib_lookup(net, &fl4, &res, FIB_LOOKUP_IGNORE_LINKSTATE) == 0) { |
41347dcd | 382 | if (res.type == RTN_UNICAST) |
1da177e4 | 383 | ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST; |
1da177e4 LT |
384 | } |
385 | return ret; | |
386 | ||
387 | last_resort: | |
388 | if (rpf) | |
b5f7e755 | 389 | goto e_rpf; |
1da177e4 LT |
390 | *itag = 0; |
391 | return 0; | |
392 | ||
1da177e4 LT |
393 | e_inval: |
394 | return -EINVAL; | |
b5f7e755 ED |
395 | e_rpf: |
396 | return -EXDEV; | |
1da177e4 LT |
397 | } |
398 | ||
7a9bc9b8 DM |
399 | /* Ignore rp_filter for packets protected by IPsec. */ |
400 | int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst, | |
401 | u8 tos, int oif, struct net_device *dev, | |
402 | struct in_device *idev, u32 *itag) | |
403 | { | |
404 | int r = secpath_exists(skb) ? 0 : IN_DEV_RPFILTER(idev); | |
405 | ||
e81da0e1 | 406 | if (!r && !fib_num_tclassid_users(dev_net(dev)) && |
1dced6a8 | 407 | IN_DEV_ACCEPT_LOCAL(idev) && |
e81da0e1 | 408 | (dev->ifindex != oif || !IN_DEV_TX_REDIRECTS(idev))) { |
7a9bc9b8 DM |
409 | *itag = 0; |
410 | return 0; | |
411 | } | |
412 | return __fib_validate_source(skb, src, dst, tos, oif, dev, r, idev, itag); | |
413 | } | |
414 | ||
81f7bf6c | 415 | static inline __be32 sk_extract_addr(struct sockaddr *addr) |
4e902c57 TG |
416 | { |
417 | return ((struct sockaddr_in *) addr)->sin_addr.s_addr; | |
418 | } | |
419 | ||
420 | static int put_rtax(struct nlattr *mx, int len, int type, u32 value) | |
421 | { | |
422 | struct nlattr *nla; | |
423 | ||
424 | nla = (struct nlattr *) ((char *) mx + len); | |
425 | nla->nla_type = type; | |
426 | nla->nla_len = nla_attr_size(4); | |
427 | *(u32 *) nla_data(nla) = value; | |
428 | ||
429 | return len + nla_total_size(4); | |
430 | } | |
431 | ||
4b5d47d4 | 432 | static int rtentry_to_fib_config(struct net *net, int cmd, struct rtentry *rt, |
4e902c57 TG |
433 | struct fib_config *cfg) |
434 | { | |
6d85c10a | 435 | __be32 addr; |
4e902c57 TG |
436 | int plen; |
437 | ||
438 | memset(cfg, 0, sizeof(*cfg)); | |
4b5d47d4 | 439 | cfg->fc_nlinfo.nl_net = net; |
4e902c57 TG |
440 | |
441 | if (rt->rt_dst.sa_family != AF_INET) | |
442 | return -EAFNOSUPPORT; | |
443 | ||
444 | /* | |
445 | * Check mask for validity: | |
446 | * a) it must be contiguous. | |
447 | * b) destination must have all host bits clear. | |
448 | * c) if application forgot to set correct family (AF_INET), | |
449 | * reject request unless it is absolutely clear i.e. | |
450 | * both family and mask are zero. | |
451 | */ | |
452 | plen = 32; | |
453 | addr = sk_extract_addr(&rt->rt_dst); | |
454 | if (!(rt->rt_flags & RTF_HOST)) { | |
81f7bf6c | 455 | __be32 mask = sk_extract_addr(&rt->rt_genmask); |
4e902c57 TG |
456 | |
457 | if (rt->rt_genmask.sa_family != AF_INET) { | |
458 | if (mask || rt->rt_genmask.sa_family) | |
459 | return -EAFNOSUPPORT; | |
460 | } | |
461 | ||
462 | if (bad_mask(mask, addr)) | |
463 | return -EINVAL; | |
464 | ||
465 | plen = inet_mask_len(mask); | |
466 | } | |
467 | ||
468 | cfg->fc_dst_len = plen; | |
469 | cfg->fc_dst = addr; | |
470 | ||
471 | if (cmd != SIOCDELRT) { | |
472 | cfg->fc_nlflags = NLM_F_CREATE; | |
473 | cfg->fc_protocol = RTPROT_BOOT; | |
474 | } | |
475 | ||
476 | if (rt->rt_metric) | |
477 | cfg->fc_priority = rt->rt_metric - 1; | |
478 | ||
479 | if (rt->rt_flags & RTF_REJECT) { | |
480 | cfg->fc_scope = RT_SCOPE_HOST; | |
481 | cfg->fc_type = RTN_UNREACHABLE; | |
482 | return 0; | |
483 | } | |
484 | ||
485 | cfg->fc_scope = RT_SCOPE_NOWHERE; | |
486 | cfg->fc_type = RTN_UNICAST; | |
487 | ||
488 | if (rt->rt_dev) { | |
489 | char *colon; | |
490 | struct net_device *dev; | |
491 | char devname[IFNAMSIZ]; | |
492 | ||
493 | if (copy_from_user(devname, rt->rt_dev, IFNAMSIZ-1)) | |
494 | return -EFAULT; | |
495 | ||
496 | devname[IFNAMSIZ-1] = 0; | |
497 | colon = strchr(devname, ':'); | |
498 | if (colon) | |
499 | *colon = 0; | |
4b5d47d4 | 500 | dev = __dev_get_by_name(net, devname); |
4e902c57 TG |
501 | if (!dev) |
502 | return -ENODEV; | |
503 | cfg->fc_oif = dev->ifindex; | |
5a56a0b3 | 504 | cfg->fc_table = l3mdev_fib_table(dev); |
4e902c57 TG |
505 | if (colon) { |
506 | struct in_ifaddr *ifa; | |
507 | struct in_device *in_dev = __in_dev_get_rtnl(dev); | |
508 | if (!in_dev) | |
509 | return -ENODEV; | |
510 | *colon = ':'; | |
511 | for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) | |
512 | if (strcmp(ifa->ifa_label, devname) == 0) | |
513 | break; | |
51456b29 | 514 | if (!ifa) |
4e902c57 TG |
515 | return -ENODEV; |
516 | cfg->fc_prefsrc = ifa->ifa_local; | |
517 | } | |
518 | } | |
519 | ||
520 | addr = sk_extract_addr(&rt->rt_gateway); | |
521 | if (rt->rt_gateway.sa_family == AF_INET && addr) { | |
30bbaa19 DA |
522 | unsigned int addr_type; |
523 | ||
4e902c57 | 524 | cfg->fc_gw = addr; |
30bbaa19 | 525 | addr_type = inet_addr_type_table(net, addr, cfg->fc_table); |
4e902c57 | 526 | if (rt->rt_flags & RTF_GATEWAY && |
30bbaa19 | 527 | addr_type == RTN_UNICAST) |
4e902c57 TG |
528 | cfg->fc_scope = RT_SCOPE_UNIVERSE; |
529 | } | |
530 | ||
531 | if (cmd == SIOCDELRT) | |
532 | return 0; | |
533 | ||
534 | if (rt->rt_flags & RTF_GATEWAY && !cfg->fc_gw) | |
535 | return -EINVAL; | |
536 | ||
537 | if (cfg->fc_scope == RT_SCOPE_NOWHERE) | |
538 | cfg->fc_scope = RT_SCOPE_LINK; | |
539 | ||
540 | if (rt->rt_flags & (RTF_MTU | RTF_WINDOW | RTF_IRTT)) { | |
541 | struct nlattr *mx; | |
542 | int len = 0; | |
543 | ||
544 | mx = kzalloc(3 * nla_total_size(4), GFP_KERNEL); | |
51456b29 | 545 | if (!mx) |
4e902c57 TG |
546 | return -ENOMEM; |
547 | ||
548 | if (rt->rt_flags & RTF_MTU) | |
549 | len = put_rtax(mx, len, RTAX_ADVMSS, rt->rt_mtu - 40); | |
550 | ||
551 | if (rt->rt_flags & RTF_WINDOW) | |
552 | len = put_rtax(mx, len, RTAX_WINDOW, rt->rt_window); | |
553 | ||
554 | if (rt->rt_flags & RTF_IRTT) | |
555 | len = put_rtax(mx, len, RTAX_RTT, rt->rt_irtt << 3); | |
556 | ||
557 | cfg->fc_mx = mx; | |
558 | cfg->fc_mx_len = len; | |
559 | } | |
560 | ||
561 | return 0; | |
562 | } | |
563 | ||
1da177e4 | 564 | /* |
6a31d2a9 ED |
565 | * Handle IP routing ioctl calls. |
566 | * These are used to manipulate the routing tables | |
1da177e4 | 567 | */ |
1bad118a | 568 | int ip_rt_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
1da177e4 | 569 | { |
4e902c57 TG |
570 | struct fib_config cfg; |
571 | struct rtentry rt; | |
1da177e4 | 572 | int err; |
1da177e4 LT |
573 | |
574 | switch (cmd) { | |
575 | case SIOCADDRT: /* Add a route */ | |
576 | case SIOCDELRT: /* Delete a route */ | |
52e804c6 | 577 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 | 578 | return -EPERM; |
4e902c57 TG |
579 | |
580 | if (copy_from_user(&rt, arg, sizeof(rt))) | |
1da177e4 | 581 | return -EFAULT; |
4e902c57 | 582 | |
1da177e4 | 583 | rtnl_lock(); |
1bad118a | 584 | err = rtentry_to_fib_config(net, cmd, &rt, &cfg); |
1da177e4 | 585 | if (err == 0) { |
4e902c57 TG |
586 | struct fib_table *tb; |
587 | ||
1da177e4 | 588 | if (cmd == SIOCDELRT) { |
1bad118a | 589 | tb = fib_get_table(net, cfg.fc_table); |
1da177e4 | 590 | if (tb) |
78055998 DA |
591 | err = fib_table_delete(net, tb, &cfg, |
592 | NULL); | |
4e902c57 TG |
593 | else |
594 | err = -ESRCH; | |
1da177e4 | 595 | } else { |
1bad118a | 596 | tb = fib_new_table(net, cfg.fc_table); |
1da177e4 | 597 | if (tb) |
6d8422a1 DA |
598 | err = fib_table_insert(net, tb, |
599 | &cfg, NULL); | |
4e902c57 TG |
600 | else |
601 | err = -ENOBUFS; | |
1da177e4 | 602 | } |
4e902c57 TG |
603 | |
604 | /* allocated by rtentry_to_fib_config() */ | |
605 | kfree(cfg.fc_mx); | |
1da177e4 LT |
606 | } |
607 | rtnl_unlock(); | |
608 | return err; | |
609 | } | |
610 | return -EINVAL; | |
611 | } | |
612 | ||
6a31d2a9 | 613 | const struct nla_policy rtm_ipv4_policy[RTA_MAX + 1] = { |
4e902c57 TG |
614 | [RTA_DST] = { .type = NLA_U32 }, |
615 | [RTA_SRC] = { .type = NLA_U32 }, | |
616 | [RTA_IIF] = { .type = NLA_U32 }, | |
617 | [RTA_OIF] = { .type = NLA_U32 }, | |
618 | [RTA_GATEWAY] = { .type = NLA_U32 }, | |
619 | [RTA_PRIORITY] = { .type = NLA_U32 }, | |
620 | [RTA_PREFSRC] = { .type = NLA_U32 }, | |
621 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
5176f91e | 622 | [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) }, |
4e902c57 | 623 | [RTA_FLOW] = { .type = NLA_U32 }, |
571e7226 RP |
624 | [RTA_ENCAP_TYPE] = { .type = NLA_U16 }, |
625 | [RTA_ENCAP] = { .type = NLA_NESTED }, | |
622ec2c9 | 626 | [RTA_UID] = { .type = NLA_U32 }, |
3b45a410 | 627 | [RTA_MARK] = { .type = NLA_U32 }, |
4e902c57 TG |
628 | }; |
629 | ||
4b5d47d4 | 630 | static int rtm_to_fib_config(struct net *net, struct sk_buff *skb, |
6d8422a1 DA |
631 | struct nlmsghdr *nlh, struct fib_config *cfg, |
632 | struct netlink_ext_ack *extack) | |
1da177e4 | 633 | { |
4e902c57 TG |
634 | struct nlattr *attr; |
635 | int err, remaining; | |
636 | struct rtmsg *rtm; | |
637 | ||
fceb6435 | 638 | err = nlmsg_validate(nlh, sizeof(*rtm), RTA_MAX, rtm_ipv4_policy, |
6d8422a1 | 639 | extack); |
4e902c57 TG |
640 | if (err < 0) |
641 | goto errout; | |
642 | ||
643 | memset(cfg, 0, sizeof(*cfg)); | |
644 | ||
645 | rtm = nlmsg_data(nlh); | |
4e902c57 | 646 | cfg->fc_dst_len = rtm->rtm_dst_len; |
4e902c57 TG |
647 | cfg->fc_tos = rtm->rtm_tos; |
648 | cfg->fc_table = rtm->rtm_table; | |
649 | cfg->fc_protocol = rtm->rtm_protocol; | |
650 | cfg->fc_scope = rtm->rtm_scope; | |
651 | cfg->fc_type = rtm->rtm_type; | |
652 | cfg->fc_flags = rtm->rtm_flags; | |
653 | cfg->fc_nlflags = nlh->nlmsg_flags; | |
654 | ||
15e47304 | 655 | cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid; |
4e902c57 | 656 | cfg->fc_nlinfo.nlh = nlh; |
4b5d47d4 | 657 | cfg->fc_nlinfo.nl_net = net; |
4e902c57 | 658 | |
a0ee18b9 | 659 | if (cfg->fc_type > RTN_MAX) { |
c3ab2b4e | 660 | NL_SET_ERR_MSG(extack, "Invalid route type"); |
a0ee18b9 TG |
661 | err = -EINVAL; |
662 | goto errout; | |
663 | } | |
664 | ||
4e902c57 | 665 | nlmsg_for_each_attr(attr, nlh, sizeof(struct rtmsg), remaining) { |
8f4c1f9b | 666 | switch (nla_type(attr)) { |
4e902c57 | 667 | case RTA_DST: |
17fb2c64 | 668 | cfg->fc_dst = nla_get_be32(attr); |
4e902c57 | 669 | break; |
4e902c57 TG |
670 | case RTA_OIF: |
671 | cfg->fc_oif = nla_get_u32(attr); | |
672 | break; | |
673 | case RTA_GATEWAY: | |
17fb2c64 | 674 | cfg->fc_gw = nla_get_be32(attr); |
4e902c57 TG |
675 | break; |
676 | case RTA_PRIORITY: | |
677 | cfg->fc_priority = nla_get_u32(attr); | |
678 | break; | |
679 | case RTA_PREFSRC: | |
17fb2c64 | 680 | cfg->fc_prefsrc = nla_get_be32(attr); |
4e902c57 TG |
681 | break; |
682 | case RTA_METRICS: | |
683 | cfg->fc_mx = nla_data(attr); | |
684 | cfg->fc_mx_len = nla_len(attr); | |
685 | break; | |
686 | case RTA_MULTIPATH: | |
9ed59592 | 687 | err = lwtunnel_valid_encap_type_attr(nla_data(attr), |
c255bd68 DA |
688 | nla_len(attr), |
689 | extack); | |
9ed59592 DA |
690 | if (err < 0) |
691 | goto errout; | |
4e902c57 TG |
692 | cfg->fc_mp = nla_data(attr); |
693 | cfg->fc_mp_len = nla_len(attr); | |
694 | break; | |
695 | case RTA_FLOW: | |
696 | cfg->fc_flow = nla_get_u32(attr); | |
697 | break; | |
4e902c57 TG |
698 | case RTA_TABLE: |
699 | cfg->fc_table = nla_get_u32(attr); | |
700 | break; | |
571e7226 RP |
701 | case RTA_ENCAP: |
702 | cfg->fc_encap = attr; | |
703 | break; | |
704 | case RTA_ENCAP_TYPE: | |
705 | cfg->fc_encap_type = nla_get_u16(attr); | |
c255bd68 DA |
706 | err = lwtunnel_valid_encap_type(cfg->fc_encap_type, |
707 | extack); | |
9ed59592 DA |
708 | if (err < 0) |
709 | goto errout; | |
571e7226 | 710 | break; |
1da177e4 LT |
711 | } |
712 | } | |
4e902c57 | 713 | |
1da177e4 | 714 | return 0; |
4e902c57 TG |
715 | errout: |
716 | return err; | |
1da177e4 LT |
717 | } |
718 | ||
c21ef3e3 DA |
719 | static int inet_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, |
720 | struct netlink_ext_ack *extack) | |
1da177e4 | 721 | { |
3b1e0a65 | 722 | struct net *net = sock_net(skb->sk); |
4e902c57 TG |
723 | struct fib_config cfg; |
724 | struct fib_table *tb; | |
725 | int err; | |
1da177e4 | 726 | |
6d8422a1 | 727 | err = rtm_to_fib_config(net, skb, nlh, &cfg, extack); |
4e902c57 TG |
728 | if (err < 0) |
729 | goto errout; | |
1da177e4 | 730 | |
8ad4942c | 731 | tb = fib_get_table(net, cfg.fc_table); |
51456b29 | 732 | if (!tb) { |
c3ab2b4e | 733 | NL_SET_ERR_MSG(extack, "FIB table does not exist"); |
4e902c57 TG |
734 | err = -ESRCH; |
735 | goto errout; | |
736 | } | |
737 | ||
78055998 | 738 | err = fib_table_delete(net, tb, &cfg, extack); |
4e902c57 TG |
739 | errout: |
740 | return err; | |
1da177e4 LT |
741 | } |
742 | ||
c21ef3e3 DA |
743 | static int inet_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, |
744 | struct netlink_ext_ack *extack) | |
1da177e4 | 745 | { |
3b1e0a65 | 746 | struct net *net = sock_net(skb->sk); |
4e902c57 TG |
747 | struct fib_config cfg; |
748 | struct fib_table *tb; | |
749 | int err; | |
1da177e4 | 750 | |
6d8422a1 | 751 | err = rtm_to_fib_config(net, skb, nlh, &cfg, extack); |
4e902c57 TG |
752 | if (err < 0) |
753 | goto errout; | |
1da177e4 | 754 | |
226b0b4a | 755 | tb = fib_new_table(net, cfg.fc_table); |
51456b29 | 756 | if (!tb) { |
4e902c57 TG |
757 | err = -ENOBUFS; |
758 | goto errout; | |
759 | } | |
760 | ||
6d8422a1 | 761 | err = fib_table_insert(net, tb, &cfg, extack); |
4e902c57 TG |
762 | errout: |
763 | return err; | |
1da177e4 LT |
764 | } |
765 | ||
63f3444f | 766 | static int inet_dump_fib(struct sk_buff *skb, struct netlink_callback *cb) |
1da177e4 | 767 | { |
3b1e0a65 | 768 | struct net *net = sock_net(skb->sk); |
1af5a8c4 PM |
769 | unsigned int h, s_h; |
770 | unsigned int e = 0, s_e; | |
1da177e4 | 771 | struct fib_table *tb; |
e4aef8ae | 772 | struct hlist_head *head; |
f6c5775f | 773 | int dumped = 0, err; |
1da177e4 | 774 | |
be403ea1 TG |
775 | if (nlmsg_len(cb->nlh) >= sizeof(struct rtmsg) && |
776 | ((struct rtmsg *) nlmsg_data(cb->nlh))->rtm_flags & RTM_F_CLONED) | |
0b8c7f6f | 777 | return skb->len; |
1da177e4 | 778 | |
1af5a8c4 PM |
779 | s_h = cb->args[0]; |
780 | s_e = cb->args[1]; | |
781 | ||
a7e53531 AD |
782 | rcu_read_lock(); |
783 | ||
1af5a8c4 PM |
784 | for (h = s_h; h < FIB_TABLE_HASHSZ; h++, s_e = 0) { |
785 | e = 0; | |
e4aef8ae | 786 | head = &net->ipv4.fib_table_hash[h]; |
a7e53531 | 787 | hlist_for_each_entry_rcu(tb, head, tb_hlist) { |
1af5a8c4 PM |
788 | if (e < s_e) |
789 | goto next; | |
790 | if (dumped) | |
791 | memset(&cb->args[2], 0, sizeof(cb->args) - | |
e905a9ed | 792 | 2 * sizeof(cb->args[0])); |
f6c5775f DA |
793 | err = fib_table_dump(tb, skb, cb); |
794 | if (err < 0) { | |
795 | if (likely(skb->len)) | |
796 | goto out; | |
797 | ||
798 | goto out_err; | |
799 | } | |
1af5a8c4 PM |
800 | dumped = 1; |
801 | next: | |
802 | e++; | |
803 | } | |
1da177e4 | 804 | } |
1af5a8c4 | 805 | out: |
f6c5775f DA |
806 | err = skb->len; |
807 | out_err: | |
a7e53531 AD |
808 | rcu_read_unlock(); |
809 | ||
1af5a8c4 PM |
810 | cb->args[1] = e; |
811 | cb->args[0] = h; | |
1da177e4 | 812 | |
f6c5775f | 813 | return err; |
1da177e4 LT |
814 | } |
815 | ||
816 | /* Prepare and feed intra-kernel routing request. | |
6a31d2a9 ED |
817 | * Really, it should be netlink message, but :-( netlink |
818 | * can be not configured, so that we feed it directly | |
819 | * to fib engine. It is legal, because all events occur | |
820 | * only when netlink is already locked. | |
1da177e4 | 821 | */ |
81f7bf6c | 822 | static void fib_magic(int cmd, int type, __be32 dst, int dst_len, struct in_ifaddr *ifa) |
1da177e4 | 823 | { |
c346dca1 | 824 | struct net *net = dev_net(ifa->ifa_dev->dev); |
3236b004 | 825 | u32 tb_id = l3mdev_fib_table(ifa->ifa_dev->dev); |
4e902c57 TG |
826 | struct fib_table *tb; |
827 | struct fib_config cfg = { | |
828 | .fc_protocol = RTPROT_KERNEL, | |
829 | .fc_type = type, | |
830 | .fc_dst = dst, | |
831 | .fc_dst_len = dst_len, | |
832 | .fc_prefsrc = ifa->ifa_local, | |
833 | .fc_oif = ifa->ifa_dev->dev->ifindex, | |
834 | .fc_nlflags = NLM_F_CREATE | NLM_F_APPEND, | |
4d1169c1 | 835 | .fc_nlinfo = { |
4b5d47d4 | 836 | .nl_net = net, |
4d1169c1 | 837 | }, |
4e902c57 | 838 | }; |
1da177e4 | 839 | |
021dd3b8 DA |
840 | if (!tb_id) |
841 | tb_id = (type == RTN_UNICAST) ? RT_TABLE_MAIN : RT_TABLE_LOCAL; | |
1da177e4 | 842 | |
021dd3b8 | 843 | tb = fib_new_table(net, tb_id); |
51456b29 | 844 | if (!tb) |
1da177e4 LT |
845 | return; |
846 | ||
4e902c57 | 847 | cfg.fc_table = tb->tb_id; |
1da177e4 | 848 | |
4e902c57 TG |
849 | if (type != RTN_LOCAL) |
850 | cfg.fc_scope = RT_SCOPE_LINK; | |
851 | else | |
852 | cfg.fc_scope = RT_SCOPE_HOST; | |
1da177e4 LT |
853 | |
854 | if (cmd == RTM_NEWROUTE) | |
6d8422a1 | 855 | fib_table_insert(net, tb, &cfg, NULL); |
1da177e4 | 856 | else |
78055998 | 857 | fib_table_delete(net, tb, &cfg, NULL); |
1da177e4 LT |
858 | } |
859 | ||
0ff60a45 | 860 | void fib_add_ifaddr(struct in_ifaddr *ifa) |
1da177e4 LT |
861 | { |
862 | struct in_device *in_dev = ifa->ifa_dev; | |
863 | struct net_device *dev = in_dev->dev; | |
864 | struct in_ifaddr *prim = ifa; | |
a144ea4b AV |
865 | __be32 mask = ifa->ifa_mask; |
866 | __be32 addr = ifa->ifa_local; | |
6a31d2a9 | 867 | __be32 prefix = ifa->ifa_address & mask; |
1da177e4 | 868 | |
6a31d2a9 | 869 | if (ifa->ifa_flags & IFA_F_SECONDARY) { |
1da177e4 | 870 | prim = inet_ifa_byprefix(in_dev, prefix, mask); |
51456b29 | 871 | if (!prim) { |
058bd4d2 | 872 | pr_warn("%s: bug: prim == NULL\n", __func__); |
1da177e4 LT |
873 | return; |
874 | } | |
875 | } | |
876 | ||
877 | fib_magic(RTM_NEWROUTE, RTN_LOCAL, addr, 32, prim); | |
878 | ||
6a31d2a9 | 879 | if (!(dev->flags & IFF_UP)) |
1da177e4 LT |
880 | return; |
881 | ||
882 | /* Add broadcast address, if it is explicitly assigned. */ | |
a144ea4b | 883 | if (ifa->ifa_broadcast && ifa->ifa_broadcast != htonl(0xFFFFFFFF)) |
1da177e4 LT |
884 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim); |
885 | ||
6a31d2a9 | 886 | if (!ipv4_is_zeronet(prefix) && !(ifa->ifa_flags & IFA_F_SECONDARY) && |
1da177e4 | 887 | (prefix != addr || ifa->ifa_prefixlen < 32)) { |
7b131180 PA |
888 | if (!(ifa->ifa_flags & IFA_F_NOPREFIXROUTE)) |
889 | fib_magic(RTM_NEWROUTE, | |
890 | dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST, | |
891 | prefix, ifa->ifa_prefixlen, prim); | |
1da177e4 LT |
892 | |
893 | /* Add network specific broadcasts, when it takes a sense */ | |
894 | if (ifa->ifa_prefixlen < 31) { | |
895 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix, 32, prim); | |
6a31d2a9 ED |
896 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix | ~mask, |
897 | 32, prim); | |
1da177e4 LT |
898 | } |
899 | } | |
900 | } | |
901 | ||
e6abbaa2 JA |
902 | /* Delete primary or secondary address. |
903 | * Optionally, on secondary address promotion consider the addresses | |
904 | * from subnet iprim as deleted, even if they are in device list. | |
905 | * In this case the secondary ifa can be in device list. | |
906 | */ | |
907 | void fib_del_ifaddr(struct in_ifaddr *ifa, struct in_ifaddr *iprim) | |
1da177e4 LT |
908 | { |
909 | struct in_device *in_dev = ifa->ifa_dev; | |
910 | struct net_device *dev = in_dev->dev; | |
911 | struct in_ifaddr *ifa1; | |
e6abbaa2 | 912 | struct in_ifaddr *prim = ifa, *prim1 = NULL; |
6a31d2a9 ED |
913 | __be32 brd = ifa->ifa_address | ~ifa->ifa_mask; |
914 | __be32 any = ifa->ifa_address & ifa->ifa_mask; | |
1da177e4 LT |
915 | #define LOCAL_OK 1 |
916 | #define BRD_OK 2 | |
917 | #define BRD0_OK 4 | |
918 | #define BRD1_OK 8 | |
95c96174 | 919 | unsigned int ok = 0; |
e6abbaa2 JA |
920 | int subnet = 0; /* Primary network */ |
921 | int gone = 1; /* Address is missing */ | |
922 | int same_prefsrc = 0; /* Another primary with same IP */ | |
1da177e4 | 923 | |
e6abbaa2 | 924 | if (ifa->ifa_flags & IFA_F_SECONDARY) { |
1da177e4 | 925 | prim = inet_ifa_byprefix(in_dev, any, ifa->ifa_mask); |
51456b29 | 926 | if (!prim) { |
391a2033 PA |
927 | /* if the device has been deleted, we don't perform |
928 | * address promotion | |
929 | */ | |
930 | if (!in_dev->dead) | |
931 | pr_warn("%s: bug: prim == NULL\n", __func__); | |
1da177e4 LT |
932 | return; |
933 | } | |
e6abbaa2 | 934 | if (iprim && iprim != prim) { |
058bd4d2 | 935 | pr_warn("%s: bug: iprim != prim\n", __func__); |
e6abbaa2 JA |
936 | return; |
937 | } | |
938 | } else if (!ipv4_is_zeronet(any) && | |
939 | (any != ifa->ifa_local || ifa->ifa_prefixlen < 32)) { | |
7b131180 PA |
940 | if (!(ifa->ifa_flags & IFA_F_NOPREFIXROUTE)) |
941 | fib_magic(RTM_DELROUTE, | |
942 | dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST, | |
943 | any, ifa->ifa_prefixlen, prim); | |
e6abbaa2 | 944 | subnet = 1; |
1da177e4 LT |
945 | } |
946 | ||
fbd40ea0 DM |
947 | if (in_dev->dead) |
948 | goto no_promotions; | |
949 | ||
1da177e4 | 950 | /* Deletion is more complicated than add. |
6a31d2a9 ED |
951 | * We should take care of not to delete too much :-) |
952 | * | |
953 | * Scan address list to be sure that addresses are really gone. | |
1da177e4 LT |
954 | */ |
955 | ||
956 | for (ifa1 = in_dev->ifa_list; ifa1; ifa1 = ifa1->ifa_next) { | |
e6abbaa2 JA |
957 | if (ifa1 == ifa) { |
958 | /* promotion, keep the IP */ | |
959 | gone = 0; | |
960 | continue; | |
961 | } | |
962 | /* Ignore IFAs from our subnet */ | |
963 | if (iprim && ifa1->ifa_mask == iprim->ifa_mask && | |
964 | inet_ifa_match(ifa1->ifa_address, iprim)) | |
965 | continue; | |
966 | ||
967 | /* Ignore ifa1 if it uses different primary IP (prefsrc) */ | |
968 | if (ifa1->ifa_flags & IFA_F_SECONDARY) { | |
969 | /* Another address from our subnet? */ | |
970 | if (ifa1->ifa_mask == prim->ifa_mask && | |
971 | inet_ifa_match(ifa1->ifa_address, prim)) | |
972 | prim1 = prim; | |
973 | else { | |
974 | /* We reached the secondaries, so | |
975 | * same_prefsrc should be determined. | |
976 | */ | |
977 | if (!same_prefsrc) | |
978 | continue; | |
979 | /* Search new prim1 if ifa1 is not | |
980 | * using the current prim1 | |
981 | */ | |
982 | if (!prim1 || | |
983 | ifa1->ifa_mask != prim1->ifa_mask || | |
984 | !inet_ifa_match(ifa1->ifa_address, prim1)) | |
985 | prim1 = inet_ifa_byprefix(in_dev, | |
986 | ifa1->ifa_address, | |
987 | ifa1->ifa_mask); | |
988 | if (!prim1) | |
989 | continue; | |
990 | if (prim1->ifa_local != prim->ifa_local) | |
991 | continue; | |
992 | } | |
993 | } else { | |
994 | if (prim->ifa_local != ifa1->ifa_local) | |
995 | continue; | |
996 | prim1 = ifa1; | |
997 | if (prim != prim1) | |
998 | same_prefsrc = 1; | |
999 | } | |
1da177e4 LT |
1000 | if (ifa->ifa_local == ifa1->ifa_local) |
1001 | ok |= LOCAL_OK; | |
1002 | if (ifa->ifa_broadcast == ifa1->ifa_broadcast) | |
1003 | ok |= BRD_OK; | |
1004 | if (brd == ifa1->ifa_broadcast) | |
1005 | ok |= BRD1_OK; | |
1006 | if (any == ifa1->ifa_broadcast) | |
1007 | ok |= BRD0_OK; | |
e6abbaa2 JA |
1008 | /* primary has network specific broadcasts */ |
1009 | if (prim1 == ifa1 && ifa1->ifa_prefixlen < 31) { | |
1010 | __be32 brd1 = ifa1->ifa_address | ~ifa1->ifa_mask; | |
1011 | __be32 any1 = ifa1->ifa_address & ifa1->ifa_mask; | |
1012 | ||
1013 | if (!ipv4_is_zeronet(any1)) { | |
1014 | if (ifa->ifa_broadcast == brd1 || | |
1015 | ifa->ifa_broadcast == any1) | |
1016 | ok |= BRD_OK; | |
1017 | if (brd == brd1 || brd == any1) | |
1018 | ok |= BRD1_OK; | |
1019 | if (any == brd1 || any == any1) | |
1020 | ok |= BRD0_OK; | |
1021 | } | |
1022 | } | |
1da177e4 LT |
1023 | } |
1024 | ||
fbd40ea0 | 1025 | no_promotions: |
6a31d2a9 | 1026 | if (!(ok & BRD_OK)) |
1da177e4 | 1027 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim); |
e6abbaa2 JA |
1028 | if (subnet && ifa->ifa_prefixlen < 31) { |
1029 | if (!(ok & BRD1_OK)) | |
1030 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, brd, 32, prim); | |
1031 | if (!(ok & BRD0_OK)) | |
1032 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, any, 32, prim); | |
1033 | } | |
6a31d2a9 | 1034 | if (!(ok & LOCAL_OK)) { |
30bbaa19 DA |
1035 | unsigned int addr_type; |
1036 | ||
1da177e4 LT |
1037 | fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 32, prim); |
1038 | ||
1039 | /* Check, that this local address finally disappeared. */ | |
30bbaa19 DA |
1040 | addr_type = inet_addr_type_dev_table(dev_net(dev), dev, |
1041 | ifa->ifa_local); | |
1042 | if (gone && addr_type != RTN_LOCAL) { | |
1da177e4 | 1043 | /* And the last, but not the least thing. |
6a31d2a9 ED |
1044 | * We must flush stray FIB entries. |
1045 | * | |
1046 | * First of all, we scan fib_info list searching | |
1047 | * for stray nexthop entries, then ignite fib_flush. | |
1048 | */ | |
5a56a0b3 | 1049 | if (fib_sync_down_addr(dev, ifa->ifa_local)) |
c346dca1 | 1050 | fib_flush(dev_net(dev)); |
1da177e4 LT |
1051 | } |
1052 | } | |
1053 | #undef LOCAL_OK | |
1054 | #undef BRD_OK | |
1055 | #undef BRD0_OK | |
1056 | #undef BRD1_OK | |
1057 | } | |
1058 | ||
345e9b54 | 1059 | static void nl_fib_lookup(struct net *net, struct fib_result_nl *frn) |
246955fe | 1060 | { |
e905a9ed | 1061 | |
246955fe | 1062 | struct fib_result res; |
9ade2286 DM |
1063 | struct flowi4 fl4 = { |
1064 | .flowi4_mark = frn->fl_mark, | |
1065 | .daddr = frn->fl_addr, | |
1066 | .flowi4_tos = frn->fl_tos, | |
1067 | .flowi4_scope = frn->fl_scope, | |
6a31d2a9 | 1068 | }; |
345e9b54 AD |
1069 | struct fib_table *tb; |
1070 | ||
1071 | rcu_read_lock(); | |
1072 | ||
1073 | tb = fib_get_table(net, frn->tb_id_in); | |
1194ed0a AK |
1074 | |
1075 | frn->err = -ENOENT; | |
246955fe RO |
1076 | if (tb) { |
1077 | local_bh_disable(); | |
1078 | ||
1079 | frn->tb_id = tb->tb_id; | |
9ade2286 | 1080 | frn->err = fib_table_lookup(tb, &fl4, &res, FIB_LOOKUP_NOREF); |
246955fe RO |
1081 | |
1082 | if (!frn->err) { | |
1083 | frn->prefixlen = res.prefixlen; | |
1084 | frn->nh_sel = res.nh_sel; | |
1085 | frn->type = res.type; | |
1086 | frn->scope = res.scope; | |
1087 | } | |
1088 | local_bh_enable(); | |
1089 | } | |
345e9b54 AD |
1090 | |
1091 | rcu_read_unlock(); | |
246955fe RO |
1092 | } |
1093 | ||
28f7b036 | 1094 | static void nl_fib_input(struct sk_buff *skb) |
246955fe | 1095 | { |
6bd48fcf | 1096 | struct net *net; |
246955fe | 1097 | struct fib_result_nl *frn; |
28f7b036 | 1098 | struct nlmsghdr *nlh; |
15e47304 | 1099 | u32 portid; |
1194ed0a | 1100 | |
3b1e0a65 | 1101 | net = sock_net(skb->sk); |
b529ccf2 | 1102 | nlh = nlmsg_hdr(skb); |
c64c0b3c ED |
1103 | if (skb->len < nlmsg_total_size(sizeof(*frn)) || |
1104 | skb->len < nlh->nlmsg_len || | |
573ce260 | 1105 | nlmsg_len(nlh) < sizeof(*frn)) |
ea86575e | 1106 | return; |
d883a036 | 1107 | |
3a36515f | 1108 | skb = netlink_skb_clone(skb, GFP_KERNEL); |
51456b29 | 1109 | if (!skb) |
d883a036 DL |
1110 | return; |
1111 | nlh = nlmsg_hdr(skb); | |
e905a9ed | 1112 | |
573ce260 | 1113 | frn = (struct fib_result_nl *) nlmsg_data(nlh); |
345e9b54 | 1114 | nl_fib_lookup(net, frn); |
e905a9ed | 1115 | |
28a28283 | 1116 | portid = NETLINK_CB(skb).portid; /* netlink portid */ |
15e47304 | 1117 | NETLINK_CB(skb).portid = 0; /* from kernel */ |
ac6d439d | 1118 | NETLINK_CB(skb).dst_group = 0; /* unicast */ |
15e47304 | 1119 | netlink_unicast(net->ipv4.fibnl, skb, portid, MSG_DONTWAIT); |
e905a9ed | 1120 | } |
246955fe | 1121 | |
2c8c1e72 | 1122 | static int __net_init nl_fib_lookup_init(struct net *net) |
246955fe | 1123 | { |
6bd48fcf | 1124 | struct sock *sk; |
a31f2d17 PNA |
1125 | struct netlink_kernel_cfg cfg = { |
1126 | .input = nl_fib_input, | |
1127 | }; | |
1128 | ||
9f00d977 | 1129 | sk = netlink_kernel_create(net, NETLINK_FIB_LOOKUP, &cfg); |
51456b29 | 1130 | if (!sk) |
7b1a74fd | 1131 | return -EAFNOSUPPORT; |
6bd48fcf | 1132 | net->ipv4.fibnl = sk; |
7b1a74fd DL |
1133 | return 0; |
1134 | } | |
1135 | ||
1136 | static void nl_fib_lookup_exit(struct net *net) | |
1137 | { | |
b7c6ba6e | 1138 | netlink_kernel_release(net->ipv4.fibnl); |
775516bf | 1139 | net->ipv4.fibnl = NULL; |
246955fe RO |
1140 | } |
1141 | ||
4f823def JA |
1142 | static void fib_disable_ip(struct net_device *dev, unsigned long event, |
1143 | bool force) | |
1da177e4 | 1144 | { |
4f823def | 1145 | if (fib_sync_down_dev(dev, event, force)) |
c346dca1 | 1146 | fib_flush(dev_net(dev)); |
06b4fc52 GF |
1147 | else |
1148 | rt_cache_flush(dev_net(dev)); | |
1da177e4 LT |
1149 | arp_ifdown(dev); |
1150 | } | |
1151 | ||
1152 | static int fib_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1153 | { | |
6ed2533e | 1154 | struct in_ifaddr *ifa = (struct in_ifaddr *)ptr; |
76e6ebfb | 1155 | struct net_device *dev = ifa->ifa_dev->dev; |
436c3b66 | 1156 | struct net *net = dev_net(dev); |
1da177e4 LT |
1157 | |
1158 | switch (event) { | |
1159 | case NETDEV_UP: | |
1160 | fib_add_ifaddr(ifa); | |
1161 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
8a3d0316 | 1162 | fib_sync_up(dev, RTNH_F_DEAD); |
1da177e4 | 1163 | #endif |
436c3b66 | 1164 | atomic_inc(&net->ipv4.dev_addr_genid); |
4ccfe6d4 | 1165 | rt_cache_flush(dev_net(dev)); |
1da177e4 LT |
1166 | break; |
1167 | case NETDEV_DOWN: | |
e6abbaa2 | 1168 | fib_del_ifaddr(ifa, NULL); |
436c3b66 | 1169 | atomic_inc(&net->ipv4.dev_addr_genid); |
51456b29 | 1170 | if (!ifa->ifa_dev->ifa_list) { |
1da177e4 | 1171 | /* Last address was deleted from this interface. |
6a31d2a9 | 1172 | * Disable IP. |
1da177e4 | 1173 | */ |
4f823def | 1174 | fib_disable_ip(dev, event, true); |
1da177e4 | 1175 | } else { |
4ccfe6d4 | 1176 | rt_cache_flush(dev_net(dev)); |
1da177e4 LT |
1177 | } |
1178 | break; | |
1179 | } | |
1180 | return NOTIFY_DONE; | |
1181 | } | |
1182 | ||
1183 | static int fib_netdev_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1184 | { | |
351638e7 | 1185 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
7f49e7a3 | 1186 | struct netdev_notifier_changeupper_info *info; |
0115e8e3 | 1187 | struct in_device *in_dev; |
436c3b66 | 1188 | struct net *net = dev_net(dev); |
8a3d0316 | 1189 | unsigned int flags; |
1da177e4 LT |
1190 | |
1191 | if (event == NETDEV_UNREGISTER) { | |
4f823def | 1192 | fib_disable_ip(dev, event, true); |
caacf05e | 1193 | rt_flush_dev(dev); |
1da177e4 LT |
1194 | return NOTIFY_DONE; |
1195 | } | |
1196 | ||
0115e8e3 | 1197 | in_dev = __in_dev_get_rtnl(dev); |
a0065f26 OH |
1198 | if (!in_dev) |
1199 | return NOTIFY_DONE; | |
0115e8e3 | 1200 | |
1da177e4 LT |
1201 | switch (event) { |
1202 | case NETDEV_UP: | |
1203 | for_ifa(in_dev) { | |
1204 | fib_add_ifaddr(ifa); | |
1205 | } endfor_ifa(in_dev); | |
1206 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
8a3d0316 | 1207 | fib_sync_up(dev, RTNH_F_DEAD); |
1da177e4 | 1208 | #endif |
436c3b66 | 1209 | atomic_inc(&net->ipv4.dev_addr_genid); |
4ccfe6d4 | 1210 | rt_cache_flush(net); |
1da177e4 LT |
1211 | break; |
1212 | case NETDEV_DOWN: | |
4f823def | 1213 | fib_disable_ip(dev, event, false); |
1da177e4 | 1214 | break; |
1da177e4 | 1215 | case NETDEV_CHANGE: |
8a3d0316 AG |
1216 | flags = dev_get_flags(dev); |
1217 | if (flags & (IFF_RUNNING | IFF_LOWER_UP)) | |
1218 | fib_sync_up(dev, RTNH_F_LINKDOWN); | |
1219 | else | |
4f823def | 1220 | fib_sync_down_dev(dev, event, false); |
8a3d0316 AG |
1221 | /* fall through */ |
1222 | case NETDEV_CHANGEMTU: | |
4ccfe6d4 | 1223 | rt_cache_flush(net); |
1da177e4 | 1224 | break; |
7f49e7a3 DA |
1225 | case NETDEV_CHANGEUPPER: |
1226 | info = ptr; | |
1227 | /* flush all routes if dev is linked to or unlinked from | |
1228 | * an L3 master device (e.g., VRF) | |
1229 | */ | |
1230 | if (info->upper_dev && netif_is_l3_master(info->upper_dev)) | |
1231 | fib_disable_ip(dev, NETDEV_DOWN, true); | |
1232 | break; | |
1da177e4 LT |
1233 | } |
1234 | return NOTIFY_DONE; | |
1235 | } | |
1236 | ||
1237 | static struct notifier_block fib_inetaddr_notifier = { | |
6ed2533e | 1238 | .notifier_call = fib_inetaddr_event, |
1da177e4 LT |
1239 | }; |
1240 | ||
1241 | static struct notifier_block fib_netdev_notifier = { | |
6ed2533e | 1242 | .notifier_call = fib_netdev_event, |
1da177e4 LT |
1243 | }; |
1244 | ||
7b1a74fd | 1245 | static int __net_init ip_fib_net_init(struct net *net) |
1da177e4 | 1246 | { |
dce5cbee | 1247 | int err; |
10da66f7 ED |
1248 | size_t size = sizeof(struct hlist_head) * FIB_TABLE_HASHSZ; |
1249 | ||
cacaad11 IS |
1250 | net->ipv4.fib_seq = 0; |
1251 | ||
10da66f7 ED |
1252 | /* Avoid false sharing : Use at least a full cache line */ |
1253 | size = max_t(size_t, size, L1_CACHE_BYTES); | |
1af5a8c4 | 1254 | |
10da66f7 | 1255 | net->ipv4.fib_table_hash = kzalloc(size, GFP_KERNEL); |
51456b29 | 1256 | if (!net->ipv4.fib_table_hash) |
e4aef8ae DL |
1257 | return -ENOMEM; |
1258 | ||
dce5cbee DL |
1259 | err = fib4_rules_init(net); |
1260 | if (err < 0) | |
1261 | goto fail; | |
1262 | return 0; | |
1263 | ||
1264 | fail: | |
1265 | kfree(net->ipv4.fib_table_hash); | |
1266 | return err; | |
7b1a74fd | 1267 | } |
1da177e4 | 1268 | |
2c8c1e72 | 1269 | static void ip_fib_net_exit(struct net *net) |
7b1a74fd DL |
1270 | { |
1271 | unsigned int i; | |
1272 | ||
6dede75b | 1273 | rtnl_lock(); |
6e47d6ca | 1274 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
6e47d6ca AD |
1275 | RCU_INIT_POINTER(net->ipv4.fib_main, NULL); |
1276 | RCU_INIT_POINTER(net->ipv4.fib_default, NULL); | |
1277 | #endif | |
7b1a74fd | 1278 | for (i = 0; i < FIB_TABLE_HASHSZ; i++) { |
a7e53531 | 1279 | struct hlist_head *head = &net->ipv4.fib_table_hash[i]; |
b67bfe0d | 1280 | struct hlist_node *tmp; |
a7e53531 AD |
1281 | struct fib_table *tb; |
1282 | ||
b67bfe0d SL |
1283 | hlist_for_each_entry_safe(tb, tmp, head, tb_hlist) { |
1284 | hlist_del(&tb->tb_hlist); | |
b90eb754 | 1285 | fib_table_flush(net, tb); |
4aa2c466 | 1286 | fib_free_table(tb); |
7b1a74fd DL |
1287 | } |
1288 | } | |
ad88d051 AD |
1289 | |
1290 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
1291 | fib4_rules_exit(net); | |
1292 | #endif | |
e2666f84 | 1293 | rtnl_unlock(); |
e4aef8ae | 1294 | kfree(net->ipv4.fib_table_hash); |
7b1a74fd DL |
1295 | } |
1296 | ||
1297 | static int __net_init fib_net_init(struct net *net) | |
1298 | { | |
1299 | int error; | |
1300 | ||
f4530fa5 DM |
1301 | #ifdef CONFIG_IP_ROUTE_CLASSID |
1302 | net->ipv4.fib_num_tclassid_users = 0; | |
1303 | #endif | |
7b1a74fd DL |
1304 | error = ip_fib_net_init(net); |
1305 | if (error < 0) | |
1306 | goto out; | |
1307 | error = nl_fib_lookup_init(net); | |
1308 | if (error < 0) | |
1309 | goto out_nlfl; | |
1310 | error = fib_proc_init(net); | |
1311 | if (error < 0) | |
1312 | goto out_proc; | |
1313 | out: | |
1314 | return error; | |
1315 | ||
1316 | out_proc: | |
1317 | nl_fib_lookup_exit(net); | |
1318 | out_nlfl: | |
1319 | ip_fib_net_exit(net); | |
1320 | goto out; | |
1321 | } | |
1322 | ||
1323 | static void __net_exit fib_net_exit(struct net *net) | |
1324 | { | |
1325 | fib_proc_exit(net); | |
1326 | nl_fib_lookup_exit(net); | |
1327 | ip_fib_net_exit(net); | |
1328 | } | |
1329 | ||
1330 | static struct pernet_operations fib_net_ops = { | |
1331 | .init = fib_net_init, | |
1332 | .exit = fib_net_exit, | |
1333 | }; | |
1334 | ||
1335 | void __init ip_fib_init(void) | |
1336 | { | |
8799a221 | 1337 | fib_trie_init(); |
7b1a74fd DL |
1338 | |
1339 | register_pernet_subsys(&fib_net_ops); | |
8799a221 | 1340 | |
7b1a74fd DL |
1341 | register_netdevice_notifier(&fib_netdev_notifier); |
1342 | register_inetaddr_notifier(&fib_inetaddr_notifier); | |
7f9b8052 | 1343 | |
8799a221 MB |
1344 | rtnl_register(PF_INET, RTM_NEWROUTE, inet_rtm_newroute, NULL, NULL); |
1345 | rtnl_register(PF_INET, RTM_DELROUTE, inet_rtm_delroute, NULL, NULL); | |
1346 | rtnl_register(PF_INET, RTM_GETROUTE, NULL, inet_dump_fib, NULL); | |
1da177e4 | 1347 | } |