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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> |
f6d3c192 | 49 | #include <trace/events/fib.h> |
1da177e4 | 50 | |
1da177e4 LT |
51 | #ifndef CONFIG_IP_MULTIPLE_TABLES |
52 | ||
7b1a74fd | 53 | static int __net_init fib4_rules_init(struct net *net) |
c3e9a353 | 54 | { |
93456b6d DL |
55 | struct fib_table *local_table, *main_table; |
56 | ||
0ddcf43d | 57 | main_table = fib_trie_table(RT_TABLE_MAIN, NULL); |
51456b29 | 58 | if (!main_table) |
61f0d861 | 59 | return -ENOMEM; |
dbb50165 | 60 | |
0ddcf43d | 61 | local_table = fib_trie_table(RT_TABLE_LOCAL, main_table); |
51456b29 | 62 | if (!local_table) |
61f0d861 | 63 | goto fail; |
0ddcf43d | 64 | |
93456b6d | 65 | hlist_add_head_rcu(&local_table->tb_hlist, |
e4aef8ae | 66 | &net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX]); |
93456b6d | 67 | hlist_add_head_rcu(&main_table->tb_hlist, |
e4aef8ae | 68 | &net->ipv4.fib_table_hash[TABLE_MAIN_INDEX]); |
dbb50165 DL |
69 | return 0; |
70 | ||
71 | fail: | |
61f0d861 | 72 | fib_free_table(main_table); |
dbb50165 | 73 | return -ENOMEM; |
c3e9a353 | 74 | } |
1af5a8c4 | 75 | #else |
1da177e4 | 76 | |
8ad4942c | 77 | struct fib_table *fib_new_table(struct net *net, u32 id) |
1da177e4 | 78 | { |
0ddcf43d | 79 | struct fib_table *tb, *alias = NULL; |
1af5a8c4 | 80 | unsigned int h; |
1da177e4 | 81 | |
1af5a8c4 PM |
82 | if (id == 0) |
83 | id = RT_TABLE_MAIN; | |
8ad4942c | 84 | tb = fib_get_table(net, id); |
1af5a8c4 PM |
85 | if (tb) |
86 | return tb; | |
7f9b8052 | 87 | |
0ddcf43d AD |
88 | if (id == RT_TABLE_LOCAL) |
89 | alias = fib_new_table(net, RT_TABLE_MAIN); | |
90 | ||
91 | tb = fib_trie_table(id, alias); | |
1da177e4 LT |
92 | if (!tb) |
93 | return NULL; | |
f4530fa5 DM |
94 | |
95 | switch (id) { | |
f4530fa5 | 96 | case RT_TABLE_MAIN: |
a7e53531 | 97 | rcu_assign_pointer(net->ipv4.fib_main, tb); |
f4530fa5 | 98 | break; |
f4530fa5 | 99 | case RT_TABLE_DEFAULT: |
a7e53531 | 100 | rcu_assign_pointer(net->ipv4.fib_default, tb); |
f4530fa5 | 101 | break; |
f4530fa5 DM |
102 | default: |
103 | break; | |
104 | } | |
105 | ||
1af5a8c4 | 106 | h = id & (FIB_TABLE_HASHSZ - 1); |
e4aef8ae | 107 | hlist_add_head_rcu(&tb->tb_hlist, &net->ipv4.fib_table_hash[h]); |
1da177e4 LT |
108 | return tb; |
109 | } | |
b3b4663c | 110 | EXPORT_SYMBOL_GPL(fib_new_table); |
1da177e4 | 111 | |
345e9b54 | 112 | /* caller must hold either rtnl or rcu read lock */ |
8ad4942c | 113 | struct fib_table *fib_get_table(struct net *net, u32 id) |
1af5a8c4 PM |
114 | { |
115 | struct fib_table *tb; | |
e4aef8ae | 116 | struct hlist_head *head; |
1af5a8c4 | 117 | unsigned int h; |
1da177e4 | 118 | |
1af5a8c4 PM |
119 | if (id == 0) |
120 | id = RT_TABLE_MAIN; | |
121 | h = id & (FIB_TABLE_HASHSZ - 1); | |
e4aef8ae | 122 | |
e4aef8ae | 123 | head = &net->ipv4.fib_table_hash[h]; |
b67bfe0d | 124 | hlist_for_each_entry_rcu(tb, head, tb_hlist) { |
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 | ||
e4aef8ae | 184 | static 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) | |
b90eb754 | 195 | flushed += fib_table_flush(net, tb); |
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)) { |
05538116 LAT |
226 | if (!dev || dev == res.fi->fib_dev) |
227 | ret = res.type; | |
1da177e4 LT |
228 | } |
229 | } | |
345e9b54 AD |
230 | |
231 | rcu_read_unlock(); | |
1da177e4 LT |
232 | return ret; |
233 | } | |
234 | ||
9b8ff518 | 235 | unsigned int inet_addr_type_table(struct net *net, __be32 addr, u32 tb_id) |
15be405e DA |
236 | { |
237 | return __inet_dev_addr_type(net, NULL, addr, tb_id); | |
238 | } | |
239 | EXPORT_SYMBOL(inet_addr_type_table); | |
240 | ||
6b175b26 | 241 | unsigned int inet_addr_type(struct net *net, __be32 addr) |
05538116 | 242 | { |
15be405e | 243 | return __inet_dev_addr_type(net, NULL, addr, RT_TABLE_LOCAL); |
05538116 | 244 | } |
4bc2f18b | 245 | EXPORT_SYMBOL(inet_addr_type); |
05538116 | 246 | |
6b175b26 EB |
247 | unsigned int inet_dev_addr_type(struct net *net, const struct net_device *dev, |
248 | __be32 addr) | |
05538116 | 249 | { |
3236b004 | 250 | u32 rt_table = l3mdev_fib_table(dev) ? : RT_TABLE_LOCAL; |
15be405e DA |
251 | |
252 | return __inet_dev_addr_type(net, dev, addr, rt_table); | |
05538116 | 253 | } |
4bc2f18b | 254 | EXPORT_SYMBOL(inet_dev_addr_type); |
05538116 | 255 | |
30bbaa19 DA |
256 | /* inet_addr_type with dev == NULL but using the table from a dev |
257 | * if one is associated | |
258 | */ | |
259 | unsigned int inet_addr_type_dev_table(struct net *net, | |
260 | const struct net_device *dev, | |
261 | __be32 addr) | |
262 | { | |
3236b004 | 263 | u32 rt_table = l3mdev_fib_table(dev) ? : RT_TABLE_LOCAL; |
30bbaa19 DA |
264 | |
265 | return __inet_dev_addr_type(net, NULL, addr, rt_table); | |
266 | } | |
267 | EXPORT_SYMBOL(inet_addr_type_dev_table); | |
268 | ||
35ebf65e DM |
269 | __be32 fib_compute_spec_dst(struct sk_buff *skb) |
270 | { | |
271 | struct net_device *dev = skb->dev; | |
272 | struct in_device *in_dev; | |
273 | struct fib_result res; | |
a207a4b2 | 274 | struct rtable *rt; |
35ebf65e | 275 | struct net *net; |
a207a4b2 | 276 | int scope; |
35ebf65e | 277 | |
a207a4b2 | 278 | rt = skb_rtable(skb); |
0cc535a2 JA |
279 | if ((rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST | RTCF_LOCAL)) == |
280 | RTCF_LOCAL) | |
35ebf65e DM |
281 | return ip_hdr(skb)->daddr; |
282 | ||
283 | in_dev = __in_dev_get_rcu(dev); | |
284 | BUG_ON(!in_dev); | |
35ebf65e DM |
285 | |
286 | net = dev_net(dev); | |
a207a4b2 DM |
287 | |
288 | scope = RT_SCOPE_UNIVERSE; | |
289 | if (!ipv4_is_zeronet(ip_hdr(skb)->saddr)) { | |
4cfc86f3 LR |
290 | struct flowi4 fl4 = { |
291 | .flowi4_iif = LOOPBACK_IFINDEX, | |
292 | .daddr = ip_hdr(skb)->saddr, | |
293 | .flowi4_tos = RT_TOS(ip_hdr(skb)->tos), | |
294 | .flowi4_scope = scope, | |
295 | .flowi4_mark = IN_DEV_SRC_VMARK(in_dev) ? skb->mark : 0, | |
296 | }; | |
0eeb075f | 297 | if (!fib_lookup(net, &fl4, &res, 0)) |
a207a4b2 DM |
298 | return FIB_RES_PREFSRC(net, res); |
299 | } else { | |
300 | scope = RT_SCOPE_LINK; | |
301 | } | |
302 | ||
303 | return inet_select_addr(dev, ip_hdr(skb)->saddr, scope); | |
35ebf65e DM |
304 | } |
305 | ||
1da177e4 | 306 | /* Given (packet source, input interface) and optional (dst, oif, tos): |
6a31d2a9 ED |
307 | * - (main) check, that source is valid i.e. not broadcast or our local |
308 | * address. | |
309 | * - figure out what "logical" interface this packet arrived | |
310 | * and calculate "specific destination" address. | |
311 | * - check, that packet arrived from expected physical interface. | |
ebc0ffae | 312 | * called with rcu_read_lock() |
1da177e4 | 313 | */ |
7a9bc9b8 DM |
314 | static int __fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst, |
315 | u8 tos, int oif, struct net_device *dev, | |
316 | int rpf, struct in_device *idev, u32 *itag) | |
1da177e4 | 317 | { |
1dced6a8 | 318 | int ret, no_addr; |
1da177e4 | 319 | struct fib_result res; |
9e56e380 | 320 | struct flowi4 fl4; |
5b707aaa | 321 | struct net *net; |
9e56e380 | 322 | bool dev_match; |
1da177e4 | 323 | |
9ade2286 | 324 | fl4.flowi4_oif = 0; |
385add90 | 325 | fl4.flowi4_iif = l3mdev_master_ifindex_rcu(dev); |
cd2fbe1b DA |
326 | if (!fl4.flowi4_iif) |
327 | fl4.flowi4_iif = oif ? : LOOPBACK_IFINDEX; | |
9ade2286 DM |
328 | fl4.daddr = src; |
329 | fl4.saddr = dst; | |
330 | fl4.flowi4_tos = tos; | |
331 | fl4.flowi4_scope = RT_SCOPE_UNIVERSE; | |
1b7179d3 | 332 | fl4.flowi4_tun_key.tun_id = 0; |
b84f7878 | 333 | fl4.flowi4_flags = 0; |
cc7e17ea | 334 | |
9e56e380 | 335 | no_addr = idev->ifa_list == NULL; |
990078af | 336 | |
9e56e380 | 337 | fl4.flowi4_mark = IN_DEV_SRC_VMARK(idev) ? skb->mark : 0; |
1da177e4 | 338 | |
f6d3c192 DA |
339 | trace_fib_validate_source(dev, &fl4); |
340 | ||
c346dca1 | 341 | net = dev_net(dev); |
0eeb075f | 342 | if (fib_lookup(net, &fl4, &res, 0)) |
1da177e4 | 343 | goto last_resort; |
1dced6a8 SB |
344 | if (res.type != RTN_UNICAST && |
345 | (res.type != RTN_LOCAL || !IN_DEV_ACCEPT_LOCAL(idev))) | |
346 | goto e_inval; | |
347 | if (!rpf && !fib_num_tclassid_users(dev_net(dev)) && | |
348 | (dev->ifindex != oif || !IN_DEV_TX_REDIRECTS(idev))) | |
349 | goto last_resort; | |
1da177e4 | 350 | fib_combine_itag(itag, &res); |
6f86b325 DM |
351 | dev_match = false; |
352 | ||
1da177e4 | 353 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
6f86b325 DM |
354 | for (ret = 0; ret < res.fi->fib_nhs; ret++) { |
355 | struct fib_nh *nh = &res.fi->fib_nh[ret]; | |
356 | ||
357 | if (nh->nh_dev == dev) { | |
358 | dev_match = true; | |
359 | break; | |
385add90 | 360 | } else if (l3mdev_master_ifindex_rcu(nh->nh_dev) == dev->ifindex) { |
cd2fbe1b DA |
361 | dev_match = true; |
362 | break; | |
6f86b325 DM |
363 | } |
364 | } | |
1da177e4 LT |
365 | #else |
366 | if (FIB_RES_DEV(res) == dev) | |
6f86b325 | 367 | dev_match = true; |
1da177e4 | 368 | #endif |
6f86b325 | 369 | if (dev_match) { |
1da177e4 | 370 | ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST; |
1da177e4 LT |
371 | return ret; |
372 | } | |
1da177e4 LT |
373 | if (no_addr) |
374 | goto last_resort; | |
c1cf8422 | 375 | if (rpf == 1) |
b5f7e755 | 376 | goto e_rpf; |
9ade2286 | 377 | fl4.flowi4_oif = dev->ifindex; |
1da177e4 LT |
378 | |
379 | ret = 0; | |
0eeb075f | 380 | if (fib_lookup(net, &fl4, &res, FIB_LOOKUP_IGNORE_LINKSTATE) == 0) { |
41347dcd | 381 | if (res.type == RTN_UNICAST) |
1da177e4 | 382 | ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST; |
1da177e4 LT |
383 | } |
384 | return ret; | |
385 | ||
386 | last_resort: | |
387 | if (rpf) | |
b5f7e755 | 388 | goto e_rpf; |
1da177e4 LT |
389 | *itag = 0; |
390 | return 0; | |
391 | ||
1da177e4 LT |
392 | e_inval: |
393 | return -EINVAL; | |
b5f7e755 ED |
394 | e_rpf: |
395 | return -EXDEV; | |
1da177e4 LT |
396 | } |
397 | ||
7a9bc9b8 DM |
398 | /* Ignore rp_filter for packets protected by IPsec. */ |
399 | int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst, | |
400 | u8 tos, int oif, struct net_device *dev, | |
401 | struct in_device *idev, u32 *itag) | |
402 | { | |
403 | int r = secpath_exists(skb) ? 0 : IN_DEV_RPFILTER(idev); | |
404 | ||
e81da0e1 | 405 | if (!r && !fib_num_tclassid_users(dev_net(dev)) && |
1dced6a8 | 406 | IN_DEV_ACCEPT_LOCAL(idev) && |
e81da0e1 | 407 | (dev->ifindex != oif || !IN_DEV_TX_REDIRECTS(idev))) { |
7a9bc9b8 DM |
408 | *itag = 0; |
409 | return 0; | |
410 | } | |
411 | return __fib_validate_source(skb, src, dst, tos, oif, dev, r, idev, itag); | |
412 | } | |
413 | ||
81f7bf6c | 414 | static inline __be32 sk_extract_addr(struct sockaddr *addr) |
4e902c57 TG |
415 | { |
416 | return ((struct sockaddr_in *) addr)->sin_addr.s_addr; | |
417 | } | |
418 | ||
419 | static int put_rtax(struct nlattr *mx, int len, int type, u32 value) | |
420 | { | |
421 | struct nlattr *nla; | |
422 | ||
423 | nla = (struct nlattr *) ((char *) mx + len); | |
424 | nla->nla_type = type; | |
425 | nla->nla_len = nla_attr_size(4); | |
426 | *(u32 *) nla_data(nla) = value; | |
427 | ||
428 | return len + nla_total_size(4); | |
429 | } | |
430 | ||
4b5d47d4 | 431 | static int rtentry_to_fib_config(struct net *net, int cmd, struct rtentry *rt, |
4e902c57 TG |
432 | struct fib_config *cfg) |
433 | { | |
6d85c10a | 434 | __be32 addr; |
4e902c57 TG |
435 | int plen; |
436 | ||
437 | memset(cfg, 0, sizeof(*cfg)); | |
4b5d47d4 | 438 | cfg->fc_nlinfo.nl_net = net; |
4e902c57 TG |
439 | |
440 | if (rt->rt_dst.sa_family != AF_INET) | |
441 | return -EAFNOSUPPORT; | |
442 | ||
443 | /* | |
444 | * Check mask for validity: | |
445 | * a) it must be contiguous. | |
446 | * b) destination must have all host bits clear. | |
447 | * c) if application forgot to set correct family (AF_INET), | |
448 | * reject request unless it is absolutely clear i.e. | |
449 | * both family and mask are zero. | |
450 | */ | |
451 | plen = 32; | |
452 | addr = sk_extract_addr(&rt->rt_dst); | |
453 | if (!(rt->rt_flags & RTF_HOST)) { | |
81f7bf6c | 454 | __be32 mask = sk_extract_addr(&rt->rt_genmask); |
4e902c57 TG |
455 | |
456 | if (rt->rt_genmask.sa_family != AF_INET) { | |
457 | if (mask || rt->rt_genmask.sa_family) | |
458 | return -EAFNOSUPPORT; | |
459 | } | |
460 | ||
461 | if (bad_mask(mask, addr)) | |
462 | return -EINVAL; | |
463 | ||
464 | plen = inet_mask_len(mask); | |
465 | } | |
466 | ||
467 | cfg->fc_dst_len = plen; | |
468 | cfg->fc_dst = addr; | |
469 | ||
470 | if (cmd != SIOCDELRT) { | |
471 | cfg->fc_nlflags = NLM_F_CREATE; | |
472 | cfg->fc_protocol = RTPROT_BOOT; | |
473 | } | |
474 | ||
475 | if (rt->rt_metric) | |
476 | cfg->fc_priority = rt->rt_metric - 1; | |
477 | ||
478 | if (rt->rt_flags & RTF_REJECT) { | |
479 | cfg->fc_scope = RT_SCOPE_HOST; | |
480 | cfg->fc_type = RTN_UNREACHABLE; | |
481 | return 0; | |
482 | } | |
483 | ||
484 | cfg->fc_scope = RT_SCOPE_NOWHERE; | |
485 | cfg->fc_type = RTN_UNICAST; | |
486 | ||
487 | if (rt->rt_dev) { | |
488 | char *colon; | |
489 | struct net_device *dev; | |
490 | char devname[IFNAMSIZ]; | |
491 | ||
492 | if (copy_from_user(devname, rt->rt_dev, IFNAMSIZ-1)) | |
493 | return -EFAULT; | |
494 | ||
495 | devname[IFNAMSIZ-1] = 0; | |
496 | colon = strchr(devname, ':'); | |
497 | if (colon) | |
498 | *colon = 0; | |
4b5d47d4 | 499 | dev = __dev_get_by_name(net, devname); |
4e902c57 TG |
500 | if (!dev) |
501 | return -ENODEV; | |
502 | cfg->fc_oif = dev->ifindex; | |
5a56a0b3 | 503 | cfg->fc_table = l3mdev_fib_table(dev); |
4e902c57 TG |
504 | if (colon) { |
505 | struct in_ifaddr *ifa; | |
506 | struct in_device *in_dev = __in_dev_get_rtnl(dev); | |
507 | if (!in_dev) | |
508 | return -ENODEV; | |
509 | *colon = ':'; | |
510 | for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) | |
511 | if (strcmp(ifa->ifa_label, devname) == 0) | |
512 | break; | |
51456b29 | 513 | if (!ifa) |
4e902c57 TG |
514 | return -ENODEV; |
515 | cfg->fc_prefsrc = ifa->ifa_local; | |
516 | } | |
517 | } | |
518 | ||
519 | addr = sk_extract_addr(&rt->rt_gateway); | |
520 | if (rt->rt_gateway.sa_family == AF_INET && addr) { | |
30bbaa19 DA |
521 | unsigned int addr_type; |
522 | ||
4e902c57 | 523 | cfg->fc_gw = addr; |
30bbaa19 | 524 | addr_type = inet_addr_type_table(net, addr, cfg->fc_table); |
4e902c57 | 525 | if (rt->rt_flags & RTF_GATEWAY && |
30bbaa19 | 526 | addr_type == RTN_UNICAST) |
4e902c57 TG |
527 | cfg->fc_scope = RT_SCOPE_UNIVERSE; |
528 | } | |
529 | ||
530 | if (cmd == SIOCDELRT) | |
531 | return 0; | |
532 | ||
533 | if (rt->rt_flags & RTF_GATEWAY && !cfg->fc_gw) | |
534 | return -EINVAL; | |
535 | ||
536 | if (cfg->fc_scope == RT_SCOPE_NOWHERE) | |
537 | cfg->fc_scope = RT_SCOPE_LINK; | |
538 | ||
539 | if (rt->rt_flags & (RTF_MTU | RTF_WINDOW | RTF_IRTT)) { | |
540 | struct nlattr *mx; | |
541 | int len = 0; | |
542 | ||
543 | mx = kzalloc(3 * nla_total_size(4), GFP_KERNEL); | |
51456b29 | 544 | if (!mx) |
4e902c57 TG |
545 | return -ENOMEM; |
546 | ||
547 | if (rt->rt_flags & RTF_MTU) | |
548 | len = put_rtax(mx, len, RTAX_ADVMSS, rt->rt_mtu - 40); | |
549 | ||
550 | if (rt->rt_flags & RTF_WINDOW) | |
551 | len = put_rtax(mx, len, RTAX_WINDOW, rt->rt_window); | |
552 | ||
553 | if (rt->rt_flags & RTF_IRTT) | |
554 | len = put_rtax(mx, len, RTAX_RTT, rt->rt_irtt << 3); | |
555 | ||
556 | cfg->fc_mx = mx; | |
557 | cfg->fc_mx_len = len; | |
558 | } | |
559 | ||
560 | return 0; | |
561 | } | |
562 | ||
1da177e4 | 563 | /* |
6a31d2a9 ED |
564 | * Handle IP routing ioctl calls. |
565 | * These are used to manipulate the routing tables | |
1da177e4 | 566 | */ |
1bad118a | 567 | int ip_rt_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
1da177e4 | 568 | { |
4e902c57 TG |
569 | struct fib_config cfg; |
570 | struct rtentry rt; | |
1da177e4 | 571 | int err; |
1da177e4 LT |
572 | |
573 | switch (cmd) { | |
574 | case SIOCADDRT: /* Add a route */ | |
575 | case SIOCDELRT: /* Delete a route */ | |
52e804c6 | 576 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 | 577 | return -EPERM; |
4e902c57 TG |
578 | |
579 | if (copy_from_user(&rt, arg, sizeof(rt))) | |
1da177e4 | 580 | return -EFAULT; |
4e902c57 | 581 | |
1da177e4 | 582 | rtnl_lock(); |
1bad118a | 583 | err = rtentry_to_fib_config(net, cmd, &rt, &cfg); |
1da177e4 | 584 | if (err == 0) { |
4e902c57 TG |
585 | struct fib_table *tb; |
586 | ||
1da177e4 | 587 | if (cmd == SIOCDELRT) { |
1bad118a | 588 | tb = fib_get_table(net, cfg.fc_table); |
1da177e4 | 589 | if (tb) |
b90eb754 | 590 | err = fib_table_delete(net, tb, &cfg); |
4e902c57 TG |
591 | else |
592 | err = -ESRCH; | |
1da177e4 | 593 | } else { |
1bad118a | 594 | tb = fib_new_table(net, cfg.fc_table); |
1da177e4 | 595 | if (tb) |
b90eb754 | 596 | err = fib_table_insert(net, tb, &cfg); |
4e902c57 TG |
597 | else |
598 | err = -ENOBUFS; | |
1da177e4 | 599 | } |
4e902c57 TG |
600 | |
601 | /* allocated by rtentry_to_fib_config() */ | |
602 | kfree(cfg.fc_mx); | |
1da177e4 LT |
603 | } |
604 | rtnl_unlock(); | |
605 | return err; | |
606 | } | |
607 | return -EINVAL; | |
608 | } | |
609 | ||
6a31d2a9 | 610 | const struct nla_policy rtm_ipv4_policy[RTA_MAX + 1] = { |
4e902c57 TG |
611 | [RTA_DST] = { .type = NLA_U32 }, |
612 | [RTA_SRC] = { .type = NLA_U32 }, | |
613 | [RTA_IIF] = { .type = NLA_U32 }, | |
614 | [RTA_OIF] = { .type = NLA_U32 }, | |
615 | [RTA_GATEWAY] = { .type = NLA_U32 }, | |
616 | [RTA_PRIORITY] = { .type = NLA_U32 }, | |
617 | [RTA_PREFSRC] = { .type = NLA_U32 }, | |
618 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
5176f91e | 619 | [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) }, |
4e902c57 | 620 | [RTA_FLOW] = { .type = NLA_U32 }, |
571e7226 RP |
621 | [RTA_ENCAP_TYPE] = { .type = NLA_U16 }, |
622 | [RTA_ENCAP] = { .type = NLA_NESTED }, | |
622ec2c9 | 623 | [RTA_UID] = { .type = NLA_U32 }, |
4e902c57 TG |
624 | }; |
625 | ||
4b5d47d4 | 626 | static int rtm_to_fib_config(struct net *net, struct sk_buff *skb, |
6a31d2a9 | 627 | struct nlmsghdr *nlh, struct fib_config *cfg) |
1da177e4 | 628 | { |
4e902c57 TG |
629 | struct nlattr *attr; |
630 | int err, remaining; | |
631 | struct rtmsg *rtm; | |
632 | ||
633 | err = nlmsg_validate(nlh, sizeof(*rtm), RTA_MAX, rtm_ipv4_policy); | |
634 | if (err < 0) | |
635 | goto errout; | |
636 | ||
637 | memset(cfg, 0, sizeof(*cfg)); | |
638 | ||
639 | rtm = nlmsg_data(nlh); | |
4e902c57 | 640 | cfg->fc_dst_len = rtm->rtm_dst_len; |
4e902c57 TG |
641 | cfg->fc_tos = rtm->rtm_tos; |
642 | cfg->fc_table = rtm->rtm_table; | |
643 | cfg->fc_protocol = rtm->rtm_protocol; | |
644 | cfg->fc_scope = rtm->rtm_scope; | |
645 | cfg->fc_type = rtm->rtm_type; | |
646 | cfg->fc_flags = rtm->rtm_flags; | |
647 | cfg->fc_nlflags = nlh->nlmsg_flags; | |
648 | ||
15e47304 | 649 | cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid; |
4e902c57 | 650 | cfg->fc_nlinfo.nlh = nlh; |
4b5d47d4 | 651 | cfg->fc_nlinfo.nl_net = net; |
4e902c57 | 652 | |
a0ee18b9 TG |
653 | if (cfg->fc_type > RTN_MAX) { |
654 | err = -EINVAL; | |
655 | goto errout; | |
656 | } | |
657 | ||
4e902c57 | 658 | nlmsg_for_each_attr(attr, nlh, sizeof(struct rtmsg), remaining) { |
8f4c1f9b | 659 | switch (nla_type(attr)) { |
4e902c57 | 660 | case RTA_DST: |
17fb2c64 | 661 | cfg->fc_dst = nla_get_be32(attr); |
4e902c57 | 662 | break; |
4e902c57 TG |
663 | case RTA_OIF: |
664 | cfg->fc_oif = nla_get_u32(attr); | |
665 | break; | |
666 | case RTA_GATEWAY: | |
17fb2c64 | 667 | cfg->fc_gw = nla_get_be32(attr); |
4e902c57 TG |
668 | break; |
669 | case RTA_PRIORITY: | |
670 | cfg->fc_priority = nla_get_u32(attr); | |
671 | break; | |
672 | case RTA_PREFSRC: | |
17fb2c64 | 673 | cfg->fc_prefsrc = nla_get_be32(attr); |
4e902c57 TG |
674 | break; |
675 | case RTA_METRICS: | |
676 | cfg->fc_mx = nla_data(attr); | |
677 | cfg->fc_mx_len = nla_len(attr); | |
678 | break; | |
679 | case RTA_MULTIPATH: | |
680 | cfg->fc_mp = nla_data(attr); | |
681 | cfg->fc_mp_len = nla_len(attr); | |
682 | break; | |
683 | case RTA_FLOW: | |
684 | cfg->fc_flow = nla_get_u32(attr); | |
685 | break; | |
4e902c57 TG |
686 | case RTA_TABLE: |
687 | cfg->fc_table = nla_get_u32(attr); | |
688 | break; | |
571e7226 RP |
689 | case RTA_ENCAP: |
690 | cfg->fc_encap = attr; | |
691 | break; | |
692 | case RTA_ENCAP_TYPE: | |
693 | cfg->fc_encap_type = nla_get_u16(attr); | |
694 | break; | |
1da177e4 LT |
695 | } |
696 | } | |
4e902c57 | 697 | |
1da177e4 | 698 | return 0; |
4e902c57 TG |
699 | errout: |
700 | return err; | |
1da177e4 LT |
701 | } |
702 | ||
661d2967 | 703 | static int inet_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh) |
1da177e4 | 704 | { |
3b1e0a65 | 705 | struct net *net = sock_net(skb->sk); |
4e902c57 TG |
706 | struct fib_config cfg; |
707 | struct fib_table *tb; | |
708 | int err; | |
1da177e4 | 709 | |
4b5d47d4 | 710 | err = rtm_to_fib_config(net, skb, nlh, &cfg); |
4e902c57 TG |
711 | if (err < 0) |
712 | goto errout; | |
1da177e4 | 713 | |
8ad4942c | 714 | tb = fib_get_table(net, cfg.fc_table); |
51456b29 | 715 | if (!tb) { |
4e902c57 TG |
716 | err = -ESRCH; |
717 | goto errout; | |
718 | } | |
719 | ||
b90eb754 | 720 | err = fib_table_delete(net, tb, &cfg); |
4e902c57 TG |
721 | errout: |
722 | return err; | |
1da177e4 LT |
723 | } |
724 | ||
661d2967 | 725 | static int inet_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh) |
1da177e4 | 726 | { |
3b1e0a65 | 727 | struct net *net = sock_net(skb->sk); |
4e902c57 TG |
728 | struct fib_config cfg; |
729 | struct fib_table *tb; | |
730 | int err; | |
1da177e4 | 731 | |
4b5d47d4 | 732 | err = rtm_to_fib_config(net, skb, nlh, &cfg); |
4e902c57 TG |
733 | if (err < 0) |
734 | goto errout; | |
1da177e4 | 735 | |
226b0b4a | 736 | tb = fib_new_table(net, cfg.fc_table); |
51456b29 | 737 | if (!tb) { |
4e902c57 TG |
738 | err = -ENOBUFS; |
739 | goto errout; | |
740 | } | |
741 | ||
b90eb754 | 742 | err = fib_table_insert(net, tb, &cfg); |
4e902c57 TG |
743 | errout: |
744 | return err; | |
1da177e4 LT |
745 | } |
746 | ||
63f3444f | 747 | static int inet_dump_fib(struct sk_buff *skb, struct netlink_callback *cb) |
1da177e4 | 748 | { |
3b1e0a65 | 749 | struct net *net = sock_net(skb->sk); |
1af5a8c4 PM |
750 | unsigned int h, s_h; |
751 | unsigned int e = 0, s_e; | |
1da177e4 | 752 | struct fib_table *tb; |
e4aef8ae | 753 | struct hlist_head *head; |
1af5a8c4 | 754 | int dumped = 0; |
1da177e4 | 755 | |
be403ea1 TG |
756 | if (nlmsg_len(cb->nlh) >= sizeof(struct rtmsg) && |
757 | ((struct rtmsg *) nlmsg_data(cb->nlh))->rtm_flags & RTM_F_CLONED) | |
0b8c7f6f | 758 | return skb->len; |
1da177e4 | 759 | |
1af5a8c4 PM |
760 | s_h = cb->args[0]; |
761 | s_e = cb->args[1]; | |
762 | ||
a7e53531 AD |
763 | rcu_read_lock(); |
764 | ||
1af5a8c4 PM |
765 | for (h = s_h; h < FIB_TABLE_HASHSZ; h++, s_e = 0) { |
766 | e = 0; | |
e4aef8ae | 767 | head = &net->ipv4.fib_table_hash[h]; |
a7e53531 | 768 | hlist_for_each_entry_rcu(tb, head, tb_hlist) { |
1af5a8c4 PM |
769 | if (e < s_e) |
770 | goto next; | |
771 | if (dumped) | |
772 | memset(&cb->args[2], 0, sizeof(cb->args) - | |
e905a9ed | 773 | 2 * sizeof(cb->args[0])); |
16c6cf8b | 774 | if (fib_table_dump(tb, skb, cb) < 0) |
1af5a8c4 PM |
775 | goto out; |
776 | dumped = 1; | |
777 | next: | |
778 | e++; | |
779 | } | |
1da177e4 | 780 | } |
1af5a8c4 | 781 | out: |
a7e53531 AD |
782 | rcu_read_unlock(); |
783 | ||
1af5a8c4 PM |
784 | cb->args[1] = e; |
785 | cb->args[0] = h; | |
1da177e4 LT |
786 | |
787 | return skb->len; | |
788 | } | |
789 | ||
790 | /* Prepare and feed intra-kernel routing request. | |
6a31d2a9 ED |
791 | * Really, it should be netlink message, but :-( netlink |
792 | * can be not configured, so that we feed it directly | |
793 | * to fib engine. It is legal, because all events occur | |
794 | * only when netlink is already locked. | |
1da177e4 | 795 | */ |
81f7bf6c | 796 | static void fib_magic(int cmd, int type, __be32 dst, int dst_len, struct in_ifaddr *ifa) |
1da177e4 | 797 | { |
c346dca1 | 798 | struct net *net = dev_net(ifa->ifa_dev->dev); |
3236b004 | 799 | u32 tb_id = l3mdev_fib_table(ifa->ifa_dev->dev); |
4e902c57 TG |
800 | struct fib_table *tb; |
801 | struct fib_config cfg = { | |
802 | .fc_protocol = RTPROT_KERNEL, | |
803 | .fc_type = type, | |
804 | .fc_dst = dst, | |
805 | .fc_dst_len = dst_len, | |
806 | .fc_prefsrc = ifa->ifa_local, | |
807 | .fc_oif = ifa->ifa_dev->dev->ifindex, | |
808 | .fc_nlflags = NLM_F_CREATE | NLM_F_APPEND, | |
4d1169c1 | 809 | .fc_nlinfo = { |
4b5d47d4 | 810 | .nl_net = net, |
4d1169c1 | 811 | }, |
4e902c57 | 812 | }; |
1da177e4 | 813 | |
021dd3b8 DA |
814 | if (!tb_id) |
815 | tb_id = (type == RTN_UNICAST) ? RT_TABLE_MAIN : RT_TABLE_LOCAL; | |
1da177e4 | 816 | |
021dd3b8 | 817 | tb = fib_new_table(net, tb_id); |
51456b29 | 818 | if (!tb) |
1da177e4 LT |
819 | return; |
820 | ||
4e902c57 | 821 | cfg.fc_table = tb->tb_id; |
1da177e4 | 822 | |
4e902c57 TG |
823 | if (type != RTN_LOCAL) |
824 | cfg.fc_scope = RT_SCOPE_LINK; | |
825 | else | |
826 | cfg.fc_scope = RT_SCOPE_HOST; | |
1da177e4 LT |
827 | |
828 | if (cmd == RTM_NEWROUTE) | |
b90eb754 | 829 | fib_table_insert(net, tb, &cfg); |
1da177e4 | 830 | else |
b90eb754 | 831 | fib_table_delete(net, tb, &cfg); |
1da177e4 LT |
832 | } |
833 | ||
0ff60a45 | 834 | void fib_add_ifaddr(struct in_ifaddr *ifa) |
1da177e4 LT |
835 | { |
836 | struct in_device *in_dev = ifa->ifa_dev; | |
837 | struct net_device *dev = in_dev->dev; | |
838 | struct in_ifaddr *prim = ifa; | |
a144ea4b AV |
839 | __be32 mask = ifa->ifa_mask; |
840 | __be32 addr = ifa->ifa_local; | |
6a31d2a9 | 841 | __be32 prefix = ifa->ifa_address & mask; |
1da177e4 | 842 | |
6a31d2a9 | 843 | if (ifa->ifa_flags & IFA_F_SECONDARY) { |
1da177e4 | 844 | prim = inet_ifa_byprefix(in_dev, prefix, mask); |
51456b29 | 845 | if (!prim) { |
058bd4d2 | 846 | pr_warn("%s: bug: prim == NULL\n", __func__); |
1da177e4 LT |
847 | return; |
848 | } | |
849 | } | |
850 | ||
851 | fib_magic(RTM_NEWROUTE, RTN_LOCAL, addr, 32, prim); | |
852 | ||
6a31d2a9 | 853 | if (!(dev->flags & IFF_UP)) |
1da177e4 LT |
854 | return; |
855 | ||
856 | /* Add broadcast address, if it is explicitly assigned. */ | |
a144ea4b | 857 | if (ifa->ifa_broadcast && ifa->ifa_broadcast != htonl(0xFFFFFFFF)) |
1da177e4 LT |
858 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim); |
859 | ||
6a31d2a9 | 860 | if (!ipv4_is_zeronet(prefix) && !(ifa->ifa_flags & IFA_F_SECONDARY) && |
1da177e4 | 861 | (prefix != addr || ifa->ifa_prefixlen < 32)) { |
7b131180 PA |
862 | if (!(ifa->ifa_flags & IFA_F_NOPREFIXROUTE)) |
863 | fib_magic(RTM_NEWROUTE, | |
864 | dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST, | |
865 | prefix, ifa->ifa_prefixlen, prim); | |
1da177e4 LT |
866 | |
867 | /* Add network specific broadcasts, when it takes a sense */ | |
868 | if (ifa->ifa_prefixlen < 31) { | |
869 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix, 32, prim); | |
6a31d2a9 ED |
870 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix | ~mask, |
871 | 32, prim); | |
1da177e4 LT |
872 | } |
873 | } | |
874 | } | |
875 | ||
e6abbaa2 JA |
876 | /* Delete primary or secondary address. |
877 | * Optionally, on secondary address promotion consider the addresses | |
878 | * from subnet iprim as deleted, even if they are in device list. | |
879 | * In this case the secondary ifa can be in device list. | |
880 | */ | |
881 | void fib_del_ifaddr(struct in_ifaddr *ifa, struct in_ifaddr *iprim) | |
1da177e4 LT |
882 | { |
883 | struct in_device *in_dev = ifa->ifa_dev; | |
884 | struct net_device *dev = in_dev->dev; | |
885 | struct in_ifaddr *ifa1; | |
e6abbaa2 | 886 | struct in_ifaddr *prim = ifa, *prim1 = NULL; |
6a31d2a9 ED |
887 | __be32 brd = ifa->ifa_address | ~ifa->ifa_mask; |
888 | __be32 any = ifa->ifa_address & ifa->ifa_mask; | |
1da177e4 LT |
889 | #define LOCAL_OK 1 |
890 | #define BRD_OK 2 | |
891 | #define BRD0_OK 4 | |
892 | #define BRD1_OK 8 | |
95c96174 | 893 | unsigned int ok = 0; |
e6abbaa2 JA |
894 | int subnet = 0; /* Primary network */ |
895 | int gone = 1; /* Address is missing */ | |
896 | int same_prefsrc = 0; /* Another primary with same IP */ | |
1da177e4 | 897 | |
e6abbaa2 | 898 | if (ifa->ifa_flags & IFA_F_SECONDARY) { |
1da177e4 | 899 | prim = inet_ifa_byprefix(in_dev, any, ifa->ifa_mask); |
51456b29 | 900 | if (!prim) { |
391a2033 PA |
901 | /* if the device has been deleted, we don't perform |
902 | * address promotion | |
903 | */ | |
904 | if (!in_dev->dead) | |
905 | pr_warn("%s: bug: prim == NULL\n", __func__); | |
1da177e4 LT |
906 | return; |
907 | } | |
e6abbaa2 | 908 | if (iprim && iprim != prim) { |
058bd4d2 | 909 | pr_warn("%s: bug: iprim != prim\n", __func__); |
e6abbaa2 JA |
910 | return; |
911 | } | |
912 | } else if (!ipv4_is_zeronet(any) && | |
913 | (any != ifa->ifa_local || ifa->ifa_prefixlen < 32)) { | |
7b131180 PA |
914 | if (!(ifa->ifa_flags & IFA_F_NOPREFIXROUTE)) |
915 | fib_magic(RTM_DELROUTE, | |
916 | dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST, | |
917 | any, ifa->ifa_prefixlen, prim); | |
e6abbaa2 | 918 | subnet = 1; |
1da177e4 LT |
919 | } |
920 | ||
fbd40ea0 DM |
921 | if (in_dev->dead) |
922 | goto no_promotions; | |
923 | ||
1da177e4 | 924 | /* Deletion is more complicated than add. |
6a31d2a9 ED |
925 | * We should take care of not to delete too much :-) |
926 | * | |
927 | * Scan address list to be sure that addresses are really gone. | |
1da177e4 LT |
928 | */ |
929 | ||
930 | for (ifa1 = in_dev->ifa_list; ifa1; ifa1 = ifa1->ifa_next) { | |
e6abbaa2 JA |
931 | if (ifa1 == ifa) { |
932 | /* promotion, keep the IP */ | |
933 | gone = 0; | |
934 | continue; | |
935 | } | |
936 | /* Ignore IFAs from our subnet */ | |
937 | if (iprim && ifa1->ifa_mask == iprim->ifa_mask && | |
938 | inet_ifa_match(ifa1->ifa_address, iprim)) | |
939 | continue; | |
940 | ||
941 | /* Ignore ifa1 if it uses different primary IP (prefsrc) */ | |
942 | if (ifa1->ifa_flags & IFA_F_SECONDARY) { | |
943 | /* Another address from our subnet? */ | |
944 | if (ifa1->ifa_mask == prim->ifa_mask && | |
945 | inet_ifa_match(ifa1->ifa_address, prim)) | |
946 | prim1 = prim; | |
947 | else { | |
948 | /* We reached the secondaries, so | |
949 | * same_prefsrc should be determined. | |
950 | */ | |
951 | if (!same_prefsrc) | |
952 | continue; | |
953 | /* Search new prim1 if ifa1 is not | |
954 | * using the current prim1 | |
955 | */ | |
956 | if (!prim1 || | |
957 | ifa1->ifa_mask != prim1->ifa_mask || | |
958 | !inet_ifa_match(ifa1->ifa_address, prim1)) | |
959 | prim1 = inet_ifa_byprefix(in_dev, | |
960 | ifa1->ifa_address, | |
961 | ifa1->ifa_mask); | |
962 | if (!prim1) | |
963 | continue; | |
964 | if (prim1->ifa_local != prim->ifa_local) | |
965 | continue; | |
966 | } | |
967 | } else { | |
968 | if (prim->ifa_local != ifa1->ifa_local) | |
969 | continue; | |
970 | prim1 = ifa1; | |
971 | if (prim != prim1) | |
972 | same_prefsrc = 1; | |
973 | } | |
1da177e4 LT |
974 | if (ifa->ifa_local == ifa1->ifa_local) |
975 | ok |= LOCAL_OK; | |
976 | if (ifa->ifa_broadcast == ifa1->ifa_broadcast) | |
977 | ok |= BRD_OK; | |
978 | if (brd == ifa1->ifa_broadcast) | |
979 | ok |= BRD1_OK; | |
980 | if (any == ifa1->ifa_broadcast) | |
981 | ok |= BRD0_OK; | |
e6abbaa2 JA |
982 | /* primary has network specific broadcasts */ |
983 | if (prim1 == ifa1 && ifa1->ifa_prefixlen < 31) { | |
984 | __be32 brd1 = ifa1->ifa_address | ~ifa1->ifa_mask; | |
985 | __be32 any1 = ifa1->ifa_address & ifa1->ifa_mask; | |
986 | ||
987 | if (!ipv4_is_zeronet(any1)) { | |
988 | if (ifa->ifa_broadcast == brd1 || | |
989 | ifa->ifa_broadcast == any1) | |
990 | ok |= BRD_OK; | |
991 | if (brd == brd1 || brd == any1) | |
992 | ok |= BRD1_OK; | |
993 | if (any == brd1 || any == any1) | |
994 | ok |= BRD0_OK; | |
995 | } | |
996 | } | |
1da177e4 LT |
997 | } |
998 | ||
fbd40ea0 | 999 | no_promotions: |
6a31d2a9 | 1000 | if (!(ok & BRD_OK)) |
1da177e4 | 1001 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim); |
e6abbaa2 JA |
1002 | if (subnet && ifa->ifa_prefixlen < 31) { |
1003 | if (!(ok & BRD1_OK)) | |
1004 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, brd, 32, prim); | |
1005 | if (!(ok & BRD0_OK)) | |
1006 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, any, 32, prim); | |
1007 | } | |
6a31d2a9 | 1008 | if (!(ok & LOCAL_OK)) { |
30bbaa19 DA |
1009 | unsigned int addr_type; |
1010 | ||
1da177e4 LT |
1011 | fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 32, prim); |
1012 | ||
1013 | /* Check, that this local address finally disappeared. */ | |
30bbaa19 DA |
1014 | addr_type = inet_addr_type_dev_table(dev_net(dev), dev, |
1015 | ifa->ifa_local); | |
1016 | if (gone && addr_type != RTN_LOCAL) { | |
1da177e4 | 1017 | /* And the last, but not the least thing. |
6a31d2a9 ED |
1018 | * We must flush stray FIB entries. |
1019 | * | |
1020 | * First of all, we scan fib_info list searching | |
1021 | * for stray nexthop entries, then ignite fib_flush. | |
1022 | */ | |
5a56a0b3 | 1023 | if (fib_sync_down_addr(dev, ifa->ifa_local)) |
c346dca1 | 1024 | fib_flush(dev_net(dev)); |
1da177e4 LT |
1025 | } |
1026 | } | |
1027 | #undef LOCAL_OK | |
1028 | #undef BRD_OK | |
1029 | #undef BRD0_OK | |
1030 | #undef BRD1_OK | |
1031 | } | |
1032 | ||
345e9b54 | 1033 | static void nl_fib_lookup(struct net *net, struct fib_result_nl *frn) |
246955fe | 1034 | { |
e905a9ed | 1035 | |
246955fe | 1036 | struct fib_result res; |
9ade2286 DM |
1037 | struct flowi4 fl4 = { |
1038 | .flowi4_mark = frn->fl_mark, | |
1039 | .daddr = frn->fl_addr, | |
1040 | .flowi4_tos = frn->fl_tos, | |
1041 | .flowi4_scope = frn->fl_scope, | |
6a31d2a9 | 1042 | }; |
345e9b54 AD |
1043 | struct fib_table *tb; |
1044 | ||
1045 | rcu_read_lock(); | |
1046 | ||
1047 | tb = fib_get_table(net, frn->tb_id_in); | |
1194ed0a AK |
1048 | |
1049 | frn->err = -ENOENT; | |
246955fe RO |
1050 | if (tb) { |
1051 | local_bh_disable(); | |
1052 | ||
1053 | frn->tb_id = tb->tb_id; | |
9ade2286 | 1054 | frn->err = fib_table_lookup(tb, &fl4, &res, FIB_LOOKUP_NOREF); |
246955fe RO |
1055 | |
1056 | if (!frn->err) { | |
1057 | frn->prefixlen = res.prefixlen; | |
1058 | frn->nh_sel = res.nh_sel; | |
1059 | frn->type = res.type; | |
1060 | frn->scope = res.scope; | |
1061 | } | |
1062 | local_bh_enable(); | |
1063 | } | |
345e9b54 AD |
1064 | |
1065 | rcu_read_unlock(); | |
246955fe RO |
1066 | } |
1067 | ||
28f7b036 | 1068 | static void nl_fib_input(struct sk_buff *skb) |
246955fe | 1069 | { |
6bd48fcf | 1070 | struct net *net; |
246955fe | 1071 | struct fib_result_nl *frn; |
28f7b036 | 1072 | struct nlmsghdr *nlh; |
15e47304 | 1073 | u32 portid; |
1194ed0a | 1074 | |
3b1e0a65 | 1075 | net = sock_net(skb->sk); |
b529ccf2 | 1076 | nlh = nlmsg_hdr(skb); |
573ce260 H |
1077 | if (skb->len < NLMSG_HDRLEN || skb->len < nlh->nlmsg_len || |
1078 | nlmsg_len(nlh) < sizeof(*frn)) | |
ea86575e | 1079 | return; |
d883a036 | 1080 | |
3a36515f | 1081 | skb = netlink_skb_clone(skb, GFP_KERNEL); |
51456b29 | 1082 | if (!skb) |
d883a036 DL |
1083 | return; |
1084 | nlh = nlmsg_hdr(skb); | |
e905a9ed | 1085 | |
573ce260 | 1086 | frn = (struct fib_result_nl *) nlmsg_data(nlh); |
345e9b54 | 1087 | nl_fib_lookup(net, frn); |
e905a9ed | 1088 | |
28a28283 | 1089 | portid = NETLINK_CB(skb).portid; /* netlink portid */ |
15e47304 | 1090 | NETLINK_CB(skb).portid = 0; /* from kernel */ |
ac6d439d | 1091 | NETLINK_CB(skb).dst_group = 0; /* unicast */ |
15e47304 | 1092 | netlink_unicast(net->ipv4.fibnl, skb, portid, MSG_DONTWAIT); |
e905a9ed | 1093 | } |
246955fe | 1094 | |
2c8c1e72 | 1095 | static int __net_init nl_fib_lookup_init(struct net *net) |
246955fe | 1096 | { |
6bd48fcf | 1097 | struct sock *sk; |
a31f2d17 PNA |
1098 | struct netlink_kernel_cfg cfg = { |
1099 | .input = nl_fib_input, | |
1100 | }; | |
1101 | ||
9f00d977 | 1102 | sk = netlink_kernel_create(net, NETLINK_FIB_LOOKUP, &cfg); |
51456b29 | 1103 | if (!sk) |
7b1a74fd | 1104 | return -EAFNOSUPPORT; |
6bd48fcf | 1105 | net->ipv4.fibnl = sk; |
7b1a74fd DL |
1106 | return 0; |
1107 | } | |
1108 | ||
1109 | static void nl_fib_lookup_exit(struct net *net) | |
1110 | { | |
b7c6ba6e | 1111 | netlink_kernel_release(net->ipv4.fibnl); |
775516bf | 1112 | net->ipv4.fibnl = NULL; |
246955fe RO |
1113 | } |
1114 | ||
4f823def JA |
1115 | static void fib_disable_ip(struct net_device *dev, unsigned long event, |
1116 | bool force) | |
1da177e4 | 1117 | { |
4f823def | 1118 | if (fib_sync_down_dev(dev, event, force)) |
c346dca1 | 1119 | fib_flush(dev_net(dev)); |
4ccfe6d4 | 1120 | rt_cache_flush(dev_net(dev)); |
1da177e4 LT |
1121 | arp_ifdown(dev); |
1122 | } | |
1123 | ||
1124 | static int fib_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1125 | { | |
6ed2533e | 1126 | struct in_ifaddr *ifa = (struct in_ifaddr *)ptr; |
76e6ebfb | 1127 | struct net_device *dev = ifa->ifa_dev->dev; |
436c3b66 | 1128 | struct net *net = dev_net(dev); |
1da177e4 LT |
1129 | |
1130 | switch (event) { | |
1131 | case NETDEV_UP: | |
1132 | fib_add_ifaddr(ifa); | |
1133 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
8a3d0316 | 1134 | fib_sync_up(dev, RTNH_F_DEAD); |
1da177e4 | 1135 | #endif |
436c3b66 | 1136 | atomic_inc(&net->ipv4.dev_addr_genid); |
4ccfe6d4 | 1137 | rt_cache_flush(dev_net(dev)); |
1da177e4 LT |
1138 | break; |
1139 | case NETDEV_DOWN: | |
e6abbaa2 | 1140 | fib_del_ifaddr(ifa, NULL); |
436c3b66 | 1141 | atomic_inc(&net->ipv4.dev_addr_genid); |
51456b29 | 1142 | if (!ifa->ifa_dev->ifa_list) { |
1da177e4 | 1143 | /* Last address was deleted from this interface. |
6a31d2a9 | 1144 | * Disable IP. |
1da177e4 | 1145 | */ |
4f823def | 1146 | fib_disable_ip(dev, event, true); |
1da177e4 | 1147 | } else { |
4ccfe6d4 | 1148 | rt_cache_flush(dev_net(dev)); |
1da177e4 LT |
1149 | } |
1150 | break; | |
1151 | } | |
1152 | return NOTIFY_DONE; | |
1153 | } | |
1154 | ||
1155 | static int fib_netdev_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1156 | { | |
351638e7 | 1157 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
7f49e7a3 | 1158 | struct netdev_notifier_changeupper_info *info; |
0115e8e3 | 1159 | struct in_device *in_dev; |
436c3b66 | 1160 | struct net *net = dev_net(dev); |
8a3d0316 | 1161 | unsigned int flags; |
1da177e4 LT |
1162 | |
1163 | if (event == NETDEV_UNREGISTER) { | |
4f823def | 1164 | fib_disable_ip(dev, event, true); |
caacf05e | 1165 | rt_flush_dev(dev); |
1da177e4 LT |
1166 | return NOTIFY_DONE; |
1167 | } | |
1168 | ||
0115e8e3 | 1169 | in_dev = __in_dev_get_rtnl(dev); |
a0065f26 OH |
1170 | if (!in_dev) |
1171 | return NOTIFY_DONE; | |
0115e8e3 | 1172 | |
1da177e4 LT |
1173 | switch (event) { |
1174 | case NETDEV_UP: | |
1175 | for_ifa(in_dev) { | |
1176 | fib_add_ifaddr(ifa); | |
1177 | } endfor_ifa(in_dev); | |
1178 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
8a3d0316 | 1179 | fib_sync_up(dev, RTNH_F_DEAD); |
1da177e4 | 1180 | #endif |
436c3b66 | 1181 | atomic_inc(&net->ipv4.dev_addr_genid); |
4ccfe6d4 | 1182 | rt_cache_flush(net); |
1da177e4 LT |
1183 | break; |
1184 | case NETDEV_DOWN: | |
4f823def | 1185 | fib_disable_ip(dev, event, false); |
1da177e4 | 1186 | break; |
1da177e4 | 1187 | case NETDEV_CHANGE: |
8a3d0316 AG |
1188 | flags = dev_get_flags(dev); |
1189 | if (flags & (IFF_RUNNING | IFF_LOWER_UP)) | |
1190 | fib_sync_up(dev, RTNH_F_LINKDOWN); | |
1191 | else | |
4f823def | 1192 | fib_sync_down_dev(dev, event, false); |
8a3d0316 AG |
1193 | /* fall through */ |
1194 | case NETDEV_CHANGEMTU: | |
4ccfe6d4 | 1195 | rt_cache_flush(net); |
1da177e4 | 1196 | break; |
7f49e7a3 DA |
1197 | case NETDEV_CHANGEUPPER: |
1198 | info = ptr; | |
1199 | /* flush all routes if dev is linked to or unlinked from | |
1200 | * an L3 master device (e.g., VRF) | |
1201 | */ | |
1202 | if (info->upper_dev && netif_is_l3_master(info->upper_dev)) | |
1203 | fib_disable_ip(dev, NETDEV_DOWN, true); | |
1204 | break; | |
1da177e4 LT |
1205 | } |
1206 | return NOTIFY_DONE; | |
1207 | } | |
1208 | ||
1209 | static struct notifier_block fib_inetaddr_notifier = { | |
6ed2533e | 1210 | .notifier_call = fib_inetaddr_event, |
1da177e4 LT |
1211 | }; |
1212 | ||
1213 | static struct notifier_block fib_netdev_notifier = { | |
6ed2533e | 1214 | .notifier_call = fib_netdev_event, |
1da177e4 LT |
1215 | }; |
1216 | ||
7b1a74fd | 1217 | static int __net_init ip_fib_net_init(struct net *net) |
1da177e4 | 1218 | { |
dce5cbee | 1219 | int err; |
10da66f7 ED |
1220 | size_t size = sizeof(struct hlist_head) * FIB_TABLE_HASHSZ; |
1221 | ||
cacaad11 IS |
1222 | net->ipv4.fib_seq = 0; |
1223 | ||
10da66f7 ED |
1224 | /* Avoid false sharing : Use at least a full cache line */ |
1225 | size = max_t(size_t, size, L1_CACHE_BYTES); | |
1af5a8c4 | 1226 | |
10da66f7 | 1227 | net->ipv4.fib_table_hash = kzalloc(size, GFP_KERNEL); |
51456b29 | 1228 | if (!net->ipv4.fib_table_hash) |
e4aef8ae DL |
1229 | return -ENOMEM; |
1230 | ||
dce5cbee DL |
1231 | err = fib4_rules_init(net); |
1232 | if (err < 0) | |
1233 | goto fail; | |
1234 | return 0; | |
1235 | ||
1236 | fail: | |
1237 | kfree(net->ipv4.fib_table_hash); | |
1238 | return err; | |
7b1a74fd | 1239 | } |
1da177e4 | 1240 | |
2c8c1e72 | 1241 | static void ip_fib_net_exit(struct net *net) |
7b1a74fd DL |
1242 | { |
1243 | unsigned int i; | |
1244 | ||
6dede75b | 1245 | rtnl_lock(); |
6e47d6ca | 1246 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
6e47d6ca AD |
1247 | RCU_INIT_POINTER(net->ipv4.fib_main, NULL); |
1248 | RCU_INIT_POINTER(net->ipv4.fib_default, NULL); | |
1249 | #endif | |
7b1a74fd | 1250 | for (i = 0; i < FIB_TABLE_HASHSZ; i++) { |
a7e53531 | 1251 | struct hlist_head *head = &net->ipv4.fib_table_hash[i]; |
b67bfe0d | 1252 | struct hlist_node *tmp; |
a7e53531 AD |
1253 | struct fib_table *tb; |
1254 | ||
b67bfe0d SL |
1255 | hlist_for_each_entry_safe(tb, tmp, head, tb_hlist) { |
1256 | hlist_del(&tb->tb_hlist); | |
b90eb754 | 1257 | fib_table_flush(net, tb); |
4aa2c466 | 1258 | fib_free_table(tb); |
7b1a74fd DL |
1259 | } |
1260 | } | |
ad88d051 AD |
1261 | |
1262 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
1263 | fib4_rules_exit(net); | |
1264 | #endif | |
e2666f84 | 1265 | rtnl_unlock(); |
e4aef8ae | 1266 | kfree(net->ipv4.fib_table_hash); |
7b1a74fd DL |
1267 | } |
1268 | ||
1269 | static int __net_init fib_net_init(struct net *net) | |
1270 | { | |
1271 | int error; | |
1272 | ||
f4530fa5 DM |
1273 | #ifdef CONFIG_IP_ROUTE_CLASSID |
1274 | net->ipv4.fib_num_tclassid_users = 0; | |
1275 | #endif | |
7b1a74fd DL |
1276 | error = ip_fib_net_init(net); |
1277 | if (error < 0) | |
1278 | goto out; | |
1279 | error = nl_fib_lookup_init(net); | |
1280 | if (error < 0) | |
1281 | goto out_nlfl; | |
1282 | error = fib_proc_init(net); | |
1283 | if (error < 0) | |
1284 | goto out_proc; | |
1285 | out: | |
1286 | return error; | |
1287 | ||
1288 | out_proc: | |
1289 | nl_fib_lookup_exit(net); | |
1290 | out_nlfl: | |
1291 | ip_fib_net_exit(net); | |
1292 | goto out; | |
1293 | } | |
1294 | ||
1295 | static void __net_exit fib_net_exit(struct net *net) | |
1296 | { | |
1297 | fib_proc_exit(net); | |
1298 | nl_fib_lookup_exit(net); | |
1299 | ip_fib_net_exit(net); | |
1300 | } | |
1301 | ||
1302 | static struct pernet_operations fib_net_ops = { | |
1303 | .init = fib_net_init, | |
1304 | .exit = fib_net_exit, | |
1305 | }; | |
1306 | ||
1307 | void __init ip_fib_init(void) | |
1308 | { | |
c7ac8679 GR |
1309 | rtnl_register(PF_INET, RTM_NEWROUTE, inet_rtm_newroute, NULL, NULL); |
1310 | rtnl_register(PF_INET, RTM_DELROUTE, inet_rtm_delroute, NULL, NULL); | |
1311 | rtnl_register(PF_INET, RTM_GETROUTE, NULL, inet_dump_fib, NULL); | |
7b1a74fd DL |
1312 | |
1313 | register_pernet_subsys(&fib_net_ops); | |
1314 | register_netdevice_notifier(&fib_netdev_notifier); | |
1315 | register_inetaddr_notifier(&fib_inetaddr_notifier); | |
7f9b8052 | 1316 | |
5348ba85 | 1317 | fib_trie_init(); |
1da177e4 | 1318 | } |