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 LT |
16 | #include <linux/module.h> |
17 | #include <asm/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> |
cd2fbe1b | 48 | #include <net/vrf.h> |
1da177e4 | 49 | |
1da177e4 LT |
50 | #ifndef CONFIG_IP_MULTIPLE_TABLES |
51 | ||
7b1a74fd | 52 | static int __net_init fib4_rules_init(struct net *net) |
c3e9a353 | 53 | { |
93456b6d DL |
54 | struct fib_table *local_table, *main_table; |
55 | ||
0ddcf43d | 56 | main_table = fib_trie_table(RT_TABLE_MAIN, NULL); |
51456b29 | 57 | if (!main_table) |
61f0d861 | 58 | return -ENOMEM; |
dbb50165 | 59 | |
0ddcf43d | 60 | local_table = fib_trie_table(RT_TABLE_LOCAL, main_table); |
51456b29 | 61 | if (!local_table) |
61f0d861 | 62 | goto fail; |
0ddcf43d | 63 | |
93456b6d | 64 | hlist_add_head_rcu(&local_table->tb_hlist, |
e4aef8ae | 65 | &net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX]); |
93456b6d | 66 | hlist_add_head_rcu(&main_table->tb_hlist, |
e4aef8ae | 67 | &net->ipv4.fib_table_hash[TABLE_MAIN_INDEX]); |
dbb50165 DL |
68 | return 0; |
69 | ||
70 | fail: | |
61f0d861 | 71 | fib_free_table(main_table); |
dbb50165 | 72 | return -ENOMEM; |
c3e9a353 | 73 | } |
1af5a8c4 | 74 | #else |
1da177e4 | 75 | |
8ad4942c | 76 | struct fib_table *fib_new_table(struct net *net, u32 id) |
1da177e4 | 77 | { |
0ddcf43d | 78 | struct fib_table *tb, *alias = NULL; |
1af5a8c4 | 79 | unsigned int h; |
1da177e4 | 80 | |
1af5a8c4 PM |
81 | if (id == 0) |
82 | id = RT_TABLE_MAIN; | |
8ad4942c | 83 | tb = fib_get_table(net, id); |
1af5a8c4 PM |
84 | if (tb) |
85 | return tb; | |
7f9b8052 | 86 | |
0ddcf43d AD |
87 | if (id == RT_TABLE_LOCAL) |
88 | alias = fib_new_table(net, RT_TABLE_MAIN); | |
89 | ||
90 | tb = fib_trie_table(id, alias); | |
1da177e4 LT |
91 | if (!tb) |
92 | return NULL; | |
f4530fa5 DM |
93 | |
94 | switch (id) { | |
95 | case RT_TABLE_LOCAL: | |
a7e53531 | 96 | rcu_assign_pointer(net->ipv4.fib_local, tb); |
f4530fa5 | 97 | break; |
f4530fa5 | 98 | case RT_TABLE_MAIN: |
a7e53531 | 99 | rcu_assign_pointer(net->ipv4.fib_main, tb); |
f4530fa5 | 100 | break; |
f4530fa5 | 101 | case RT_TABLE_DEFAULT: |
a7e53531 | 102 | rcu_assign_pointer(net->ipv4.fib_default, tb); |
f4530fa5 | 103 | break; |
f4530fa5 DM |
104 | default: |
105 | break; | |
106 | } | |
107 | ||
1af5a8c4 | 108 | h = id & (FIB_TABLE_HASHSZ - 1); |
e4aef8ae | 109 | hlist_add_head_rcu(&tb->tb_hlist, &net->ipv4.fib_table_hash[h]); |
1da177e4 LT |
110 | return tb; |
111 | } | |
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) { | |
138 | case RT_TABLE_LOCAL: | |
139 | rcu_assign_pointer(net->ipv4.fib_local, new); | |
140 | break; | |
141 | case RT_TABLE_MAIN: | |
142 | rcu_assign_pointer(net->ipv4.fib_main, new); | |
143 | break; | |
144 | case RT_TABLE_DEFAULT: | |
145 | rcu_assign_pointer(net->ipv4.fib_default, new); | |
146 | break; | |
147 | default: | |
148 | break; | |
149 | } | |
150 | ||
151 | #endif | |
152 | /* replace the old table in the hlist */ | |
153 | hlist_replace_rcu(&old->tb_hlist, &new->tb_hlist); | |
154 | } | |
155 | ||
156 | int fib_unmerge(struct net *net) | |
157 | { | |
158 | struct fib_table *old, *new; | |
159 | ||
3c9e9f73 | 160 | /* attempt to fetch local table if it has been allocated */ |
0ddcf43d | 161 | old = fib_get_table(net, RT_TABLE_LOCAL); |
3c9e9f73 AD |
162 | if (!old) |
163 | return 0; | |
0ddcf43d | 164 | |
3c9e9f73 | 165 | new = fib_trie_unmerge(old); |
0ddcf43d AD |
166 | if (!new) |
167 | return -ENOMEM; | |
168 | ||
169 | /* replace merged table with clean table */ | |
170 | if (new != old) { | |
171 | fib_replace_table(net, old, new); | |
172 | fib_free_table(old); | |
173 | } | |
174 | ||
175 | return 0; | |
176 | } | |
177 | ||
e4aef8ae | 178 | static void fib_flush(struct net *net) |
1da177e4 LT |
179 | { |
180 | int flushed = 0; | |
1af5a8c4 | 181 | unsigned int h; |
1da177e4 | 182 | |
1af5a8c4 | 183 | for (h = 0; h < FIB_TABLE_HASHSZ; h++) { |
a7e53531 AD |
184 | struct hlist_head *head = &net->ipv4.fib_table_hash[h]; |
185 | struct hlist_node *tmp; | |
186 | struct fib_table *tb; | |
187 | ||
188 | hlist_for_each_entry_safe(tb, tmp, head, tb_hlist) | |
16c6cf8b | 189 | flushed += fib_table_flush(tb); |
1da177e4 | 190 | } |
1da177e4 LT |
191 | |
192 | if (flushed) | |
4ccfe6d4 | 193 | rt_cache_flush(net); |
1da177e4 LT |
194 | } |
195 | ||
104616e7 SF |
196 | void fib_flush_external(struct net *net) |
197 | { | |
198 | struct fib_table *tb; | |
199 | struct hlist_head *head; | |
200 | unsigned int h; | |
201 | ||
202 | for (h = 0; h < FIB_TABLE_HASHSZ; h++) { | |
203 | head = &net->ipv4.fib_table_hash[h]; | |
204 | hlist_for_each_entry(tb, head, tb_hlist) | |
205 | fib_table_flush_external(tb); | |
206 | } | |
207 | } | |
208 | ||
05538116 LAT |
209 | /* |
210 | * Find address type as if only "dev" was present in the system. If | |
211 | * on_dev is NULL then all interfaces are taken into consideration. | |
212 | */ | |
95c96174 ED |
213 | static inline unsigned int __inet_dev_addr_type(struct net *net, |
214 | const struct net_device *dev, | |
15be405e | 215 | __be32 addr, int tb_id) |
1da177e4 | 216 | { |
9ade2286 | 217 | struct flowi4 fl4 = { .daddr = addr }; |
1da177e4 | 218 | struct fib_result res; |
95c96174 | 219 | unsigned int ret = RTN_BROADCAST; |
15be405e | 220 | struct fib_table *table; |
1da177e4 | 221 | |
1e637c74 | 222 | if (ipv4_is_zeronet(addr) || ipv4_is_lbcast(addr)) |
1da177e4 | 223 | return RTN_BROADCAST; |
f97c1e0c | 224 | if (ipv4_is_multicast(addr)) |
1da177e4 LT |
225 | return RTN_MULTICAST; |
226 | ||
345e9b54 AD |
227 | rcu_read_lock(); |
228 | ||
15be405e DA |
229 | table = fib_get_table(net, tb_id); |
230 | if (table) { | |
1da177e4 | 231 | ret = RTN_UNICAST; |
15be405e | 232 | if (!fib_table_lookup(table, &fl4, &res, FIB_LOOKUP_NOREF)) { |
05538116 LAT |
233 | if (!dev || dev == res.fi->fib_dev) |
234 | ret = res.type; | |
1da177e4 LT |
235 | } |
236 | } | |
345e9b54 AD |
237 | |
238 | rcu_read_unlock(); | |
1da177e4 LT |
239 | return ret; |
240 | } | |
241 | ||
15be405e DA |
242 | unsigned int inet_addr_type_table(struct net *net, __be32 addr, int tb_id) |
243 | { | |
244 | return __inet_dev_addr_type(net, NULL, addr, tb_id); | |
245 | } | |
246 | EXPORT_SYMBOL(inet_addr_type_table); | |
247 | ||
6b175b26 | 248 | unsigned int inet_addr_type(struct net *net, __be32 addr) |
05538116 | 249 | { |
15be405e | 250 | return __inet_dev_addr_type(net, NULL, addr, RT_TABLE_LOCAL); |
05538116 | 251 | } |
4bc2f18b | 252 | EXPORT_SYMBOL(inet_addr_type); |
05538116 | 253 | |
6b175b26 EB |
254 | unsigned int inet_dev_addr_type(struct net *net, const struct net_device *dev, |
255 | __be32 addr) | |
05538116 | 256 | { |
15be405e DA |
257 | int rt_table = vrf_dev_table(dev) ? : RT_TABLE_LOCAL; |
258 | ||
259 | return __inet_dev_addr_type(net, dev, addr, rt_table); | |
05538116 | 260 | } |
4bc2f18b | 261 | EXPORT_SYMBOL(inet_dev_addr_type); |
05538116 | 262 | |
35ebf65e DM |
263 | __be32 fib_compute_spec_dst(struct sk_buff *skb) |
264 | { | |
265 | struct net_device *dev = skb->dev; | |
266 | struct in_device *in_dev; | |
267 | struct fib_result res; | |
a207a4b2 | 268 | struct rtable *rt; |
35ebf65e DM |
269 | struct flowi4 fl4; |
270 | struct net *net; | |
a207a4b2 | 271 | int scope; |
35ebf65e | 272 | |
a207a4b2 | 273 | rt = skb_rtable(skb); |
0cc535a2 JA |
274 | if ((rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST | RTCF_LOCAL)) == |
275 | RTCF_LOCAL) | |
35ebf65e DM |
276 | return ip_hdr(skb)->daddr; |
277 | ||
278 | in_dev = __in_dev_get_rcu(dev); | |
279 | BUG_ON(!in_dev); | |
35ebf65e DM |
280 | |
281 | net = dev_net(dev); | |
a207a4b2 DM |
282 | |
283 | scope = RT_SCOPE_UNIVERSE; | |
284 | if (!ipv4_is_zeronet(ip_hdr(skb)->saddr)) { | |
285 | fl4.flowi4_oif = 0; | |
1fb9489b | 286 | fl4.flowi4_iif = LOOPBACK_IFINDEX; |
a207a4b2 DM |
287 | fl4.daddr = ip_hdr(skb)->saddr; |
288 | fl4.saddr = 0; | |
289 | fl4.flowi4_tos = RT_TOS(ip_hdr(skb)->tos); | |
290 | fl4.flowi4_scope = scope; | |
291 | fl4.flowi4_mark = IN_DEV_SRC_VMARK(in_dev) ? skb->mark : 0; | |
1b7179d3 | 292 | fl4.flowi4_tun_key.tun_id = 0; |
0eeb075f | 293 | if (!fib_lookup(net, &fl4, &res, 0)) |
a207a4b2 DM |
294 | return FIB_RES_PREFSRC(net, res); |
295 | } else { | |
296 | scope = RT_SCOPE_LINK; | |
297 | } | |
298 | ||
299 | return inet_select_addr(dev, ip_hdr(skb)->saddr, scope); | |
35ebf65e DM |
300 | } |
301 | ||
1da177e4 | 302 | /* Given (packet source, input interface) and optional (dst, oif, tos): |
6a31d2a9 ED |
303 | * - (main) check, that source is valid i.e. not broadcast or our local |
304 | * address. | |
305 | * - figure out what "logical" interface this packet arrived | |
306 | * and calculate "specific destination" address. | |
307 | * - check, that packet arrived from expected physical interface. | |
ebc0ffae | 308 | * called with rcu_read_lock() |
1da177e4 | 309 | */ |
7a9bc9b8 DM |
310 | static int __fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst, |
311 | u8 tos, int oif, struct net_device *dev, | |
312 | int rpf, struct in_device *idev, u32 *itag) | |
1da177e4 | 313 | { |
1dced6a8 | 314 | int ret, no_addr; |
1da177e4 | 315 | struct fib_result res; |
9e56e380 | 316 | struct flowi4 fl4; |
5b707aaa | 317 | struct net *net; |
9e56e380 | 318 | bool dev_match; |
1da177e4 | 319 | |
9ade2286 | 320 | fl4.flowi4_oif = 0; |
cd2fbe1b DA |
321 | fl4.flowi4_iif = vrf_master_ifindex_rcu(dev); |
322 | if (!fl4.flowi4_iif) | |
323 | fl4.flowi4_iif = oif ? : LOOPBACK_IFINDEX; | |
9ade2286 DM |
324 | fl4.daddr = src; |
325 | fl4.saddr = dst; | |
326 | fl4.flowi4_tos = tos; | |
327 | fl4.flowi4_scope = RT_SCOPE_UNIVERSE; | |
1b7179d3 | 328 | fl4.flowi4_tun_key.tun_id = 0; |
cc7e17ea | 329 | |
9e56e380 | 330 | no_addr = idev->ifa_list == NULL; |
990078af | 331 | |
9e56e380 | 332 | fl4.flowi4_mark = IN_DEV_SRC_VMARK(idev) ? skb->mark : 0; |
1da177e4 | 333 | |
c346dca1 | 334 | net = dev_net(dev); |
0eeb075f | 335 | if (fib_lookup(net, &fl4, &res, 0)) |
1da177e4 | 336 | goto last_resort; |
1dced6a8 SB |
337 | if (res.type != RTN_UNICAST && |
338 | (res.type != RTN_LOCAL || !IN_DEV_ACCEPT_LOCAL(idev))) | |
339 | goto e_inval; | |
340 | if (!rpf && !fib_num_tclassid_users(dev_net(dev)) && | |
341 | (dev->ifindex != oif || !IN_DEV_TX_REDIRECTS(idev))) | |
342 | goto last_resort; | |
1da177e4 | 343 | fib_combine_itag(itag, &res); |
6f86b325 DM |
344 | dev_match = false; |
345 | ||
1da177e4 | 346 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
6f86b325 DM |
347 | for (ret = 0; ret < res.fi->fib_nhs; ret++) { |
348 | struct fib_nh *nh = &res.fi->fib_nh[ret]; | |
349 | ||
350 | if (nh->nh_dev == dev) { | |
351 | dev_match = true; | |
352 | break; | |
cd2fbe1b DA |
353 | } else if (vrf_master_ifindex_rcu(nh->nh_dev) == dev->ifindex) { |
354 | dev_match = true; | |
355 | break; | |
6f86b325 DM |
356 | } |
357 | } | |
1da177e4 LT |
358 | #else |
359 | if (FIB_RES_DEV(res) == dev) | |
6f86b325 | 360 | dev_match = true; |
1da177e4 | 361 | #endif |
6f86b325 | 362 | if (dev_match) { |
1da177e4 | 363 | ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST; |
1da177e4 LT |
364 | return ret; |
365 | } | |
1da177e4 LT |
366 | if (no_addr) |
367 | goto last_resort; | |
c1cf8422 | 368 | if (rpf == 1) |
b5f7e755 | 369 | goto e_rpf; |
9ade2286 | 370 | fl4.flowi4_oif = dev->ifindex; |
1da177e4 LT |
371 | |
372 | ret = 0; | |
0eeb075f | 373 | if (fib_lookup(net, &fl4, &res, FIB_LOOKUP_IGNORE_LINKSTATE) == 0) { |
41347dcd | 374 | if (res.type == RTN_UNICAST) |
1da177e4 | 375 | ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST; |
1da177e4 LT |
376 | } |
377 | return ret; | |
378 | ||
379 | last_resort: | |
380 | if (rpf) | |
b5f7e755 | 381 | goto e_rpf; |
1da177e4 LT |
382 | *itag = 0; |
383 | return 0; | |
384 | ||
1da177e4 LT |
385 | e_inval: |
386 | return -EINVAL; | |
b5f7e755 ED |
387 | e_rpf: |
388 | return -EXDEV; | |
1da177e4 LT |
389 | } |
390 | ||
7a9bc9b8 DM |
391 | /* Ignore rp_filter for packets protected by IPsec. */ |
392 | int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst, | |
393 | u8 tos, int oif, struct net_device *dev, | |
394 | struct in_device *idev, u32 *itag) | |
395 | { | |
396 | int r = secpath_exists(skb) ? 0 : IN_DEV_RPFILTER(idev); | |
397 | ||
e81da0e1 | 398 | if (!r && !fib_num_tclassid_users(dev_net(dev)) && |
1dced6a8 | 399 | IN_DEV_ACCEPT_LOCAL(idev) && |
e81da0e1 | 400 | (dev->ifindex != oif || !IN_DEV_TX_REDIRECTS(idev))) { |
7a9bc9b8 DM |
401 | *itag = 0; |
402 | return 0; | |
403 | } | |
404 | return __fib_validate_source(skb, src, dst, tos, oif, dev, r, idev, itag); | |
405 | } | |
406 | ||
81f7bf6c | 407 | static inline __be32 sk_extract_addr(struct sockaddr *addr) |
4e902c57 TG |
408 | { |
409 | return ((struct sockaddr_in *) addr)->sin_addr.s_addr; | |
410 | } | |
411 | ||
412 | static int put_rtax(struct nlattr *mx, int len, int type, u32 value) | |
413 | { | |
414 | struct nlattr *nla; | |
415 | ||
416 | nla = (struct nlattr *) ((char *) mx + len); | |
417 | nla->nla_type = type; | |
418 | nla->nla_len = nla_attr_size(4); | |
419 | *(u32 *) nla_data(nla) = value; | |
420 | ||
421 | return len + nla_total_size(4); | |
422 | } | |
423 | ||
4b5d47d4 | 424 | static int rtentry_to_fib_config(struct net *net, int cmd, struct rtentry *rt, |
4e902c57 TG |
425 | struct fib_config *cfg) |
426 | { | |
6d85c10a | 427 | __be32 addr; |
4e902c57 TG |
428 | int plen; |
429 | ||
430 | memset(cfg, 0, sizeof(*cfg)); | |
4b5d47d4 | 431 | cfg->fc_nlinfo.nl_net = net; |
4e902c57 TG |
432 | |
433 | if (rt->rt_dst.sa_family != AF_INET) | |
434 | return -EAFNOSUPPORT; | |
435 | ||
436 | /* | |
437 | * Check mask for validity: | |
438 | * a) it must be contiguous. | |
439 | * b) destination must have all host bits clear. | |
440 | * c) if application forgot to set correct family (AF_INET), | |
441 | * reject request unless it is absolutely clear i.e. | |
442 | * both family and mask are zero. | |
443 | */ | |
444 | plen = 32; | |
445 | addr = sk_extract_addr(&rt->rt_dst); | |
446 | if (!(rt->rt_flags & RTF_HOST)) { | |
81f7bf6c | 447 | __be32 mask = sk_extract_addr(&rt->rt_genmask); |
4e902c57 TG |
448 | |
449 | if (rt->rt_genmask.sa_family != AF_INET) { | |
450 | if (mask || rt->rt_genmask.sa_family) | |
451 | return -EAFNOSUPPORT; | |
452 | } | |
453 | ||
454 | if (bad_mask(mask, addr)) | |
455 | return -EINVAL; | |
456 | ||
457 | plen = inet_mask_len(mask); | |
458 | } | |
459 | ||
460 | cfg->fc_dst_len = plen; | |
461 | cfg->fc_dst = addr; | |
462 | ||
463 | if (cmd != SIOCDELRT) { | |
464 | cfg->fc_nlflags = NLM_F_CREATE; | |
465 | cfg->fc_protocol = RTPROT_BOOT; | |
466 | } | |
467 | ||
468 | if (rt->rt_metric) | |
469 | cfg->fc_priority = rt->rt_metric - 1; | |
470 | ||
471 | if (rt->rt_flags & RTF_REJECT) { | |
472 | cfg->fc_scope = RT_SCOPE_HOST; | |
473 | cfg->fc_type = RTN_UNREACHABLE; | |
474 | return 0; | |
475 | } | |
476 | ||
477 | cfg->fc_scope = RT_SCOPE_NOWHERE; | |
478 | cfg->fc_type = RTN_UNICAST; | |
479 | ||
480 | if (rt->rt_dev) { | |
481 | char *colon; | |
482 | struct net_device *dev; | |
483 | char devname[IFNAMSIZ]; | |
484 | ||
485 | if (copy_from_user(devname, rt->rt_dev, IFNAMSIZ-1)) | |
486 | return -EFAULT; | |
487 | ||
488 | devname[IFNAMSIZ-1] = 0; | |
489 | colon = strchr(devname, ':'); | |
490 | if (colon) | |
491 | *colon = 0; | |
4b5d47d4 | 492 | dev = __dev_get_by_name(net, devname); |
4e902c57 TG |
493 | if (!dev) |
494 | return -ENODEV; | |
495 | cfg->fc_oif = dev->ifindex; | |
496 | if (colon) { | |
497 | struct in_ifaddr *ifa; | |
498 | struct in_device *in_dev = __in_dev_get_rtnl(dev); | |
499 | if (!in_dev) | |
500 | return -ENODEV; | |
501 | *colon = ':'; | |
502 | for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) | |
503 | if (strcmp(ifa->ifa_label, devname) == 0) | |
504 | break; | |
51456b29 | 505 | if (!ifa) |
4e902c57 TG |
506 | return -ENODEV; |
507 | cfg->fc_prefsrc = ifa->ifa_local; | |
508 | } | |
509 | } | |
510 | ||
511 | addr = sk_extract_addr(&rt->rt_gateway); | |
512 | if (rt->rt_gateway.sa_family == AF_INET && addr) { | |
513 | cfg->fc_gw = addr; | |
514 | if (rt->rt_flags & RTF_GATEWAY && | |
4b5d47d4 | 515 | inet_addr_type(net, addr) == RTN_UNICAST) |
4e902c57 TG |
516 | cfg->fc_scope = RT_SCOPE_UNIVERSE; |
517 | } | |
518 | ||
519 | if (cmd == SIOCDELRT) | |
520 | return 0; | |
521 | ||
522 | if (rt->rt_flags & RTF_GATEWAY && !cfg->fc_gw) | |
523 | return -EINVAL; | |
524 | ||
525 | if (cfg->fc_scope == RT_SCOPE_NOWHERE) | |
526 | cfg->fc_scope = RT_SCOPE_LINK; | |
527 | ||
528 | if (rt->rt_flags & (RTF_MTU | RTF_WINDOW | RTF_IRTT)) { | |
529 | struct nlattr *mx; | |
530 | int len = 0; | |
531 | ||
532 | mx = kzalloc(3 * nla_total_size(4), GFP_KERNEL); | |
51456b29 | 533 | if (!mx) |
4e902c57 TG |
534 | return -ENOMEM; |
535 | ||
536 | if (rt->rt_flags & RTF_MTU) | |
537 | len = put_rtax(mx, len, RTAX_ADVMSS, rt->rt_mtu - 40); | |
538 | ||
539 | if (rt->rt_flags & RTF_WINDOW) | |
540 | len = put_rtax(mx, len, RTAX_WINDOW, rt->rt_window); | |
541 | ||
542 | if (rt->rt_flags & RTF_IRTT) | |
543 | len = put_rtax(mx, len, RTAX_RTT, rt->rt_irtt << 3); | |
544 | ||
545 | cfg->fc_mx = mx; | |
546 | cfg->fc_mx_len = len; | |
547 | } | |
548 | ||
549 | return 0; | |
550 | } | |
551 | ||
1da177e4 | 552 | /* |
6a31d2a9 ED |
553 | * Handle IP routing ioctl calls. |
554 | * These are used to manipulate the routing tables | |
1da177e4 | 555 | */ |
1bad118a | 556 | int ip_rt_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
1da177e4 | 557 | { |
4e902c57 TG |
558 | struct fib_config cfg; |
559 | struct rtentry rt; | |
1da177e4 | 560 | int err; |
1da177e4 LT |
561 | |
562 | switch (cmd) { | |
563 | case SIOCADDRT: /* Add a route */ | |
564 | case SIOCDELRT: /* Delete a route */ | |
52e804c6 | 565 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 | 566 | return -EPERM; |
4e902c57 TG |
567 | |
568 | if (copy_from_user(&rt, arg, sizeof(rt))) | |
1da177e4 | 569 | return -EFAULT; |
4e902c57 | 570 | |
1da177e4 | 571 | rtnl_lock(); |
1bad118a | 572 | err = rtentry_to_fib_config(net, cmd, &rt, &cfg); |
1da177e4 | 573 | if (err == 0) { |
4e902c57 TG |
574 | struct fib_table *tb; |
575 | ||
1da177e4 | 576 | if (cmd == SIOCDELRT) { |
1bad118a | 577 | tb = fib_get_table(net, cfg.fc_table); |
1da177e4 | 578 | if (tb) |
16c6cf8b | 579 | err = fib_table_delete(tb, &cfg); |
4e902c57 TG |
580 | else |
581 | err = -ESRCH; | |
1da177e4 | 582 | } else { |
1bad118a | 583 | tb = fib_new_table(net, cfg.fc_table); |
1da177e4 | 584 | if (tb) |
16c6cf8b | 585 | err = fib_table_insert(tb, &cfg); |
4e902c57 TG |
586 | else |
587 | err = -ENOBUFS; | |
1da177e4 | 588 | } |
4e902c57 TG |
589 | |
590 | /* allocated by rtentry_to_fib_config() */ | |
591 | kfree(cfg.fc_mx); | |
1da177e4 LT |
592 | } |
593 | rtnl_unlock(); | |
594 | return err; | |
595 | } | |
596 | return -EINVAL; | |
597 | } | |
598 | ||
6a31d2a9 | 599 | const struct nla_policy rtm_ipv4_policy[RTA_MAX + 1] = { |
4e902c57 TG |
600 | [RTA_DST] = { .type = NLA_U32 }, |
601 | [RTA_SRC] = { .type = NLA_U32 }, | |
602 | [RTA_IIF] = { .type = NLA_U32 }, | |
603 | [RTA_OIF] = { .type = NLA_U32 }, | |
604 | [RTA_GATEWAY] = { .type = NLA_U32 }, | |
605 | [RTA_PRIORITY] = { .type = NLA_U32 }, | |
606 | [RTA_PREFSRC] = { .type = NLA_U32 }, | |
607 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
5176f91e | 608 | [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) }, |
4e902c57 | 609 | [RTA_FLOW] = { .type = NLA_U32 }, |
571e7226 RP |
610 | [RTA_ENCAP_TYPE] = { .type = NLA_U16 }, |
611 | [RTA_ENCAP] = { .type = NLA_NESTED }, | |
4e902c57 TG |
612 | }; |
613 | ||
4b5d47d4 | 614 | static int rtm_to_fib_config(struct net *net, struct sk_buff *skb, |
6a31d2a9 | 615 | struct nlmsghdr *nlh, struct fib_config *cfg) |
1da177e4 | 616 | { |
4e902c57 TG |
617 | struct nlattr *attr; |
618 | int err, remaining; | |
619 | struct rtmsg *rtm; | |
620 | ||
621 | err = nlmsg_validate(nlh, sizeof(*rtm), RTA_MAX, rtm_ipv4_policy); | |
622 | if (err < 0) | |
623 | goto errout; | |
624 | ||
625 | memset(cfg, 0, sizeof(*cfg)); | |
626 | ||
627 | rtm = nlmsg_data(nlh); | |
4e902c57 | 628 | cfg->fc_dst_len = rtm->rtm_dst_len; |
4e902c57 TG |
629 | cfg->fc_tos = rtm->rtm_tos; |
630 | cfg->fc_table = rtm->rtm_table; | |
631 | cfg->fc_protocol = rtm->rtm_protocol; | |
632 | cfg->fc_scope = rtm->rtm_scope; | |
633 | cfg->fc_type = rtm->rtm_type; | |
634 | cfg->fc_flags = rtm->rtm_flags; | |
635 | cfg->fc_nlflags = nlh->nlmsg_flags; | |
636 | ||
15e47304 | 637 | cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid; |
4e902c57 | 638 | cfg->fc_nlinfo.nlh = nlh; |
4b5d47d4 | 639 | cfg->fc_nlinfo.nl_net = net; |
4e902c57 | 640 | |
a0ee18b9 TG |
641 | if (cfg->fc_type > RTN_MAX) { |
642 | err = -EINVAL; | |
643 | goto errout; | |
644 | } | |
645 | ||
4e902c57 | 646 | nlmsg_for_each_attr(attr, nlh, sizeof(struct rtmsg), remaining) { |
8f4c1f9b | 647 | switch (nla_type(attr)) { |
4e902c57 | 648 | case RTA_DST: |
17fb2c64 | 649 | cfg->fc_dst = nla_get_be32(attr); |
4e902c57 | 650 | break; |
4e902c57 TG |
651 | case RTA_OIF: |
652 | cfg->fc_oif = nla_get_u32(attr); | |
653 | break; | |
654 | case RTA_GATEWAY: | |
17fb2c64 | 655 | cfg->fc_gw = nla_get_be32(attr); |
4e902c57 TG |
656 | break; |
657 | case RTA_PRIORITY: | |
658 | cfg->fc_priority = nla_get_u32(attr); | |
659 | break; | |
660 | case RTA_PREFSRC: | |
17fb2c64 | 661 | cfg->fc_prefsrc = nla_get_be32(attr); |
4e902c57 TG |
662 | break; |
663 | case RTA_METRICS: | |
664 | cfg->fc_mx = nla_data(attr); | |
665 | cfg->fc_mx_len = nla_len(attr); | |
666 | break; | |
667 | case RTA_MULTIPATH: | |
668 | cfg->fc_mp = nla_data(attr); | |
669 | cfg->fc_mp_len = nla_len(attr); | |
670 | break; | |
671 | case RTA_FLOW: | |
672 | cfg->fc_flow = nla_get_u32(attr); | |
673 | break; | |
4e902c57 TG |
674 | case RTA_TABLE: |
675 | cfg->fc_table = nla_get_u32(attr); | |
676 | break; | |
571e7226 RP |
677 | case RTA_ENCAP: |
678 | cfg->fc_encap = attr; | |
679 | break; | |
680 | case RTA_ENCAP_TYPE: | |
681 | cfg->fc_encap_type = nla_get_u16(attr); | |
682 | break; | |
1da177e4 LT |
683 | } |
684 | } | |
4e902c57 | 685 | |
1da177e4 | 686 | return 0; |
4e902c57 TG |
687 | errout: |
688 | return err; | |
1da177e4 LT |
689 | } |
690 | ||
661d2967 | 691 | static int inet_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh) |
1da177e4 | 692 | { |
3b1e0a65 | 693 | struct net *net = sock_net(skb->sk); |
4e902c57 TG |
694 | struct fib_config cfg; |
695 | struct fib_table *tb; | |
696 | int err; | |
1da177e4 | 697 | |
4b5d47d4 | 698 | err = rtm_to_fib_config(net, skb, nlh, &cfg); |
4e902c57 TG |
699 | if (err < 0) |
700 | goto errout; | |
1da177e4 | 701 | |
8ad4942c | 702 | tb = fib_get_table(net, cfg.fc_table); |
51456b29 | 703 | if (!tb) { |
4e902c57 TG |
704 | err = -ESRCH; |
705 | goto errout; | |
706 | } | |
707 | ||
16c6cf8b | 708 | err = fib_table_delete(tb, &cfg); |
4e902c57 TG |
709 | errout: |
710 | return err; | |
1da177e4 LT |
711 | } |
712 | ||
661d2967 | 713 | static int inet_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh) |
1da177e4 | 714 | { |
3b1e0a65 | 715 | struct net *net = sock_net(skb->sk); |
4e902c57 TG |
716 | struct fib_config cfg; |
717 | struct fib_table *tb; | |
718 | int err; | |
1da177e4 | 719 | |
4b5d47d4 | 720 | err = rtm_to_fib_config(net, skb, nlh, &cfg); |
4e902c57 TG |
721 | if (err < 0) |
722 | goto errout; | |
1da177e4 | 723 | |
226b0b4a | 724 | tb = fib_new_table(net, cfg.fc_table); |
51456b29 | 725 | if (!tb) { |
4e902c57 TG |
726 | err = -ENOBUFS; |
727 | goto errout; | |
728 | } | |
729 | ||
16c6cf8b | 730 | err = fib_table_insert(tb, &cfg); |
4e902c57 TG |
731 | errout: |
732 | return err; | |
1da177e4 LT |
733 | } |
734 | ||
63f3444f | 735 | static int inet_dump_fib(struct sk_buff *skb, struct netlink_callback *cb) |
1da177e4 | 736 | { |
3b1e0a65 | 737 | struct net *net = sock_net(skb->sk); |
1af5a8c4 PM |
738 | unsigned int h, s_h; |
739 | unsigned int e = 0, s_e; | |
1da177e4 | 740 | struct fib_table *tb; |
e4aef8ae | 741 | struct hlist_head *head; |
1af5a8c4 | 742 | int dumped = 0; |
1da177e4 | 743 | |
be403ea1 TG |
744 | if (nlmsg_len(cb->nlh) >= sizeof(struct rtmsg) && |
745 | ((struct rtmsg *) nlmsg_data(cb->nlh))->rtm_flags & RTM_F_CLONED) | |
0b8c7f6f | 746 | return skb->len; |
1da177e4 | 747 | |
1af5a8c4 PM |
748 | s_h = cb->args[0]; |
749 | s_e = cb->args[1]; | |
750 | ||
a7e53531 AD |
751 | rcu_read_lock(); |
752 | ||
1af5a8c4 PM |
753 | for (h = s_h; h < FIB_TABLE_HASHSZ; h++, s_e = 0) { |
754 | e = 0; | |
e4aef8ae | 755 | head = &net->ipv4.fib_table_hash[h]; |
a7e53531 | 756 | hlist_for_each_entry_rcu(tb, head, tb_hlist) { |
1af5a8c4 PM |
757 | if (e < s_e) |
758 | goto next; | |
759 | if (dumped) | |
760 | memset(&cb->args[2], 0, sizeof(cb->args) - | |
e905a9ed | 761 | 2 * sizeof(cb->args[0])); |
16c6cf8b | 762 | if (fib_table_dump(tb, skb, cb) < 0) |
1af5a8c4 PM |
763 | goto out; |
764 | dumped = 1; | |
765 | next: | |
766 | e++; | |
767 | } | |
1da177e4 | 768 | } |
1af5a8c4 | 769 | out: |
a7e53531 AD |
770 | rcu_read_unlock(); |
771 | ||
1af5a8c4 PM |
772 | cb->args[1] = e; |
773 | cb->args[0] = h; | |
1da177e4 LT |
774 | |
775 | return skb->len; | |
776 | } | |
777 | ||
778 | /* Prepare and feed intra-kernel routing request. | |
6a31d2a9 ED |
779 | * Really, it should be netlink message, but :-( netlink |
780 | * can be not configured, so that we feed it directly | |
781 | * to fib engine. It is legal, because all events occur | |
782 | * only when netlink is already locked. | |
1da177e4 | 783 | */ |
81f7bf6c | 784 | static void fib_magic(int cmd, int type, __be32 dst, int dst_len, struct in_ifaddr *ifa) |
1da177e4 | 785 | { |
c346dca1 | 786 | struct net *net = dev_net(ifa->ifa_dev->dev); |
4e902c57 TG |
787 | struct fib_table *tb; |
788 | struct fib_config cfg = { | |
789 | .fc_protocol = RTPROT_KERNEL, | |
790 | .fc_type = type, | |
791 | .fc_dst = dst, | |
792 | .fc_dst_len = dst_len, | |
793 | .fc_prefsrc = ifa->ifa_local, | |
794 | .fc_oif = ifa->ifa_dev->dev->ifindex, | |
795 | .fc_nlflags = NLM_F_CREATE | NLM_F_APPEND, | |
4d1169c1 | 796 | .fc_nlinfo = { |
4b5d47d4 | 797 | .nl_net = net, |
4d1169c1 | 798 | }, |
4e902c57 | 799 | }; |
1da177e4 LT |
800 | |
801 | if (type == RTN_UNICAST) | |
4b5d47d4 | 802 | tb = fib_new_table(net, RT_TABLE_MAIN); |
1da177e4 | 803 | else |
4b5d47d4 | 804 | tb = fib_new_table(net, RT_TABLE_LOCAL); |
1da177e4 | 805 | |
51456b29 | 806 | if (!tb) |
1da177e4 LT |
807 | return; |
808 | ||
4e902c57 | 809 | cfg.fc_table = tb->tb_id; |
1da177e4 | 810 | |
4e902c57 TG |
811 | if (type != RTN_LOCAL) |
812 | cfg.fc_scope = RT_SCOPE_LINK; | |
813 | else | |
814 | cfg.fc_scope = RT_SCOPE_HOST; | |
1da177e4 LT |
815 | |
816 | if (cmd == RTM_NEWROUTE) | |
16c6cf8b | 817 | fib_table_insert(tb, &cfg); |
1da177e4 | 818 | else |
16c6cf8b | 819 | fib_table_delete(tb, &cfg); |
1da177e4 LT |
820 | } |
821 | ||
0ff60a45 | 822 | void fib_add_ifaddr(struct in_ifaddr *ifa) |
1da177e4 LT |
823 | { |
824 | struct in_device *in_dev = ifa->ifa_dev; | |
825 | struct net_device *dev = in_dev->dev; | |
826 | struct in_ifaddr *prim = ifa; | |
a144ea4b AV |
827 | __be32 mask = ifa->ifa_mask; |
828 | __be32 addr = ifa->ifa_local; | |
6a31d2a9 | 829 | __be32 prefix = ifa->ifa_address & mask; |
1da177e4 | 830 | |
6a31d2a9 | 831 | if (ifa->ifa_flags & IFA_F_SECONDARY) { |
1da177e4 | 832 | prim = inet_ifa_byprefix(in_dev, prefix, mask); |
51456b29 | 833 | if (!prim) { |
058bd4d2 | 834 | pr_warn("%s: bug: prim == NULL\n", __func__); |
1da177e4 LT |
835 | return; |
836 | } | |
837 | } | |
838 | ||
839 | fib_magic(RTM_NEWROUTE, RTN_LOCAL, addr, 32, prim); | |
840 | ||
6a31d2a9 | 841 | if (!(dev->flags & IFF_UP)) |
1da177e4 LT |
842 | return; |
843 | ||
844 | /* Add broadcast address, if it is explicitly assigned. */ | |
a144ea4b | 845 | if (ifa->ifa_broadcast && ifa->ifa_broadcast != htonl(0xFFFFFFFF)) |
1da177e4 LT |
846 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim); |
847 | ||
6a31d2a9 | 848 | if (!ipv4_is_zeronet(prefix) && !(ifa->ifa_flags & IFA_F_SECONDARY) && |
1da177e4 | 849 | (prefix != addr || ifa->ifa_prefixlen < 32)) { |
6a31d2a9 ED |
850 | fib_magic(RTM_NEWROUTE, |
851 | dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST, | |
852 | prefix, ifa->ifa_prefixlen, prim); | |
1da177e4 LT |
853 | |
854 | /* Add network specific broadcasts, when it takes a sense */ | |
855 | if (ifa->ifa_prefixlen < 31) { | |
856 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix, 32, prim); | |
6a31d2a9 ED |
857 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix | ~mask, |
858 | 32, prim); | |
1da177e4 LT |
859 | } |
860 | } | |
861 | } | |
862 | ||
e6abbaa2 JA |
863 | /* Delete primary or secondary address. |
864 | * Optionally, on secondary address promotion consider the addresses | |
865 | * from subnet iprim as deleted, even if they are in device list. | |
866 | * In this case the secondary ifa can be in device list. | |
867 | */ | |
868 | void fib_del_ifaddr(struct in_ifaddr *ifa, struct in_ifaddr *iprim) | |
1da177e4 LT |
869 | { |
870 | struct in_device *in_dev = ifa->ifa_dev; | |
871 | struct net_device *dev = in_dev->dev; | |
872 | struct in_ifaddr *ifa1; | |
e6abbaa2 | 873 | struct in_ifaddr *prim = ifa, *prim1 = NULL; |
6a31d2a9 ED |
874 | __be32 brd = ifa->ifa_address | ~ifa->ifa_mask; |
875 | __be32 any = ifa->ifa_address & ifa->ifa_mask; | |
1da177e4 LT |
876 | #define LOCAL_OK 1 |
877 | #define BRD_OK 2 | |
878 | #define BRD0_OK 4 | |
879 | #define BRD1_OK 8 | |
95c96174 | 880 | unsigned int ok = 0; |
e6abbaa2 JA |
881 | int subnet = 0; /* Primary network */ |
882 | int gone = 1; /* Address is missing */ | |
883 | int same_prefsrc = 0; /* Another primary with same IP */ | |
1da177e4 | 884 | |
e6abbaa2 | 885 | if (ifa->ifa_flags & IFA_F_SECONDARY) { |
1da177e4 | 886 | prim = inet_ifa_byprefix(in_dev, any, ifa->ifa_mask); |
51456b29 | 887 | if (!prim) { |
058bd4d2 | 888 | pr_warn("%s: bug: prim == NULL\n", __func__); |
1da177e4 LT |
889 | return; |
890 | } | |
e6abbaa2 | 891 | if (iprim && iprim != prim) { |
058bd4d2 | 892 | pr_warn("%s: bug: iprim != prim\n", __func__); |
e6abbaa2 JA |
893 | return; |
894 | } | |
895 | } else if (!ipv4_is_zeronet(any) && | |
896 | (any != ifa->ifa_local || ifa->ifa_prefixlen < 32)) { | |
897 | fib_magic(RTM_DELROUTE, | |
898 | dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST, | |
899 | any, ifa->ifa_prefixlen, prim); | |
900 | subnet = 1; | |
1da177e4 LT |
901 | } |
902 | ||
903 | /* Deletion is more complicated than add. | |
6a31d2a9 ED |
904 | * We should take care of not to delete too much :-) |
905 | * | |
906 | * Scan address list to be sure that addresses are really gone. | |
1da177e4 LT |
907 | */ |
908 | ||
909 | for (ifa1 = in_dev->ifa_list; ifa1; ifa1 = ifa1->ifa_next) { | |
e6abbaa2 JA |
910 | if (ifa1 == ifa) { |
911 | /* promotion, keep the IP */ | |
912 | gone = 0; | |
913 | continue; | |
914 | } | |
915 | /* Ignore IFAs from our subnet */ | |
916 | if (iprim && ifa1->ifa_mask == iprim->ifa_mask && | |
917 | inet_ifa_match(ifa1->ifa_address, iprim)) | |
918 | continue; | |
919 | ||
920 | /* Ignore ifa1 if it uses different primary IP (prefsrc) */ | |
921 | if (ifa1->ifa_flags & IFA_F_SECONDARY) { | |
922 | /* Another address from our subnet? */ | |
923 | if (ifa1->ifa_mask == prim->ifa_mask && | |
924 | inet_ifa_match(ifa1->ifa_address, prim)) | |
925 | prim1 = prim; | |
926 | else { | |
927 | /* We reached the secondaries, so | |
928 | * same_prefsrc should be determined. | |
929 | */ | |
930 | if (!same_prefsrc) | |
931 | continue; | |
932 | /* Search new prim1 if ifa1 is not | |
933 | * using the current prim1 | |
934 | */ | |
935 | if (!prim1 || | |
936 | ifa1->ifa_mask != prim1->ifa_mask || | |
937 | !inet_ifa_match(ifa1->ifa_address, prim1)) | |
938 | prim1 = inet_ifa_byprefix(in_dev, | |
939 | ifa1->ifa_address, | |
940 | ifa1->ifa_mask); | |
941 | if (!prim1) | |
942 | continue; | |
943 | if (prim1->ifa_local != prim->ifa_local) | |
944 | continue; | |
945 | } | |
946 | } else { | |
947 | if (prim->ifa_local != ifa1->ifa_local) | |
948 | continue; | |
949 | prim1 = ifa1; | |
950 | if (prim != prim1) | |
951 | same_prefsrc = 1; | |
952 | } | |
1da177e4 LT |
953 | if (ifa->ifa_local == ifa1->ifa_local) |
954 | ok |= LOCAL_OK; | |
955 | if (ifa->ifa_broadcast == ifa1->ifa_broadcast) | |
956 | ok |= BRD_OK; | |
957 | if (brd == ifa1->ifa_broadcast) | |
958 | ok |= BRD1_OK; | |
959 | if (any == ifa1->ifa_broadcast) | |
960 | ok |= BRD0_OK; | |
e6abbaa2 JA |
961 | /* primary has network specific broadcasts */ |
962 | if (prim1 == ifa1 && ifa1->ifa_prefixlen < 31) { | |
963 | __be32 brd1 = ifa1->ifa_address | ~ifa1->ifa_mask; | |
964 | __be32 any1 = ifa1->ifa_address & ifa1->ifa_mask; | |
965 | ||
966 | if (!ipv4_is_zeronet(any1)) { | |
967 | if (ifa->ifa_broadcast == brd1 || | |
968 | ifa->ifa_broadcast == any1) | |
969 | ok |= BRD_OK; | |
970 | if (brd == brd1 || brd == any1) | |
971 | ok |= BRD1_OK; | |
972 | if (any == brd1 || any == any1) | |
973 | ok |= BRD0_OK; | |
974 | } | |
975 | } | |
1da177e4 LT |
976 | } |
977 | ||
6a31d2a9 | 978 | if (!(ok & BRD_OK)) |
1da177e4 | 979 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim); |
e6abbaa2 JA |
980 | if (subnet && ifa->ifa_prefixlen < 31) { |
981 | if (!(ok & BRD1_OK)) | |
982 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, brd, 32, prim); | |
983 | if (!(ok & BRD0_OK)) | |
984 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, any, 32, prim); | |
985 | } | |
6a31d2a9 | 986 | if (!(ok & LOCAL_OK)) { |
1da177e4 LT |
987 | fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 32, prim); |
988 | ||
989 | /* Check, that this local address finally disappeared. */ | |
e6abbaa2 JA |
990 | if (gone && |
991 | inet_addr_type(dev_net(dev), ifa->ifa_local) != RTN_LOCAL) { | |
1da177e4 | 992 | /* And the last, but not the least thing. |
6a31d2a9 ED |
993 | * We must flush stray FIB entries. |
994 | * | |
995 | * First of all, we scan fib_info list searching | |
996 | * for stray nexthop entries, then ignite fib_flush. | |
997 | */ | |
c346dca1 YH |
998 | if (fib_sync_down_addr(dev_net(dev), ifa->ifa_local)) |
999 | fib_flush(dev_net(dev)); | |
1da177e4 LT |
1000 | } |
1001 | } | |
1002 | #undef LOCAL_OK | |
1003 | #undef BRD_OK | |
1004 | #undef BRD0_OK | |
1005 | #undef BRD1_OK | |
1006 | } | |
1007 | ||
345e9b54 | 1008 | static void nl_fib_lookup(struct net *net, struct fib_result_nl *frn) |
246955fe | 1009 | { |
e905a9ed | 1010 | |
246955fe | 1011 | struct fib_result res; |
9ade2286 DM |
1012 | struct flowi4 fl4 = { |
1013 | .flowi4_mark = frn->fl_mark, | |
1014 | .daddr = frn->fl_addr, | |
1015 | .flowi4_tos = frn->fl_tos, | |
1016 | .flowi4_scope = frn->fl_scope, | |
6a31d2a9 | 1017 | }; |
345e9b54 AD |
1018 | struct fib_table *tb; |
1019 | ||
1020 | rcu_read_lock(); | |
1021 | ||
1022 | tb = fib_get_table(net, frn->tb_id_in); | |
1194ed0a AK |
1023 | |
1024 | frn->err = -ENOENT; | |
246955fe RO |
1025 | if (tb) { |
1026 | local_bh_disable(); | |
1027 | ||
1028 | frn->tb_id = tb->tb_id; | |
9ade2286 | 1029 | frn->err = fib_table_lookup(tb, &fl4, &res, FIB_LOOKUP_NOREF); |
246955fe RO |
1030 | |
1031 | if (!frn->err) { | |
1032 | frn->prefixlen = res.prefixlen; | |
1033 | frn->nh_sel = res.nh_sel; | |
1034 | frn->type = res.type; | |
1035 | frn->scope = res.scope; | |
1036 | } | |
1037 | local_bh_enable(); | |
1038 | } | |
345e9b54 AD |
1039 | |
1040 | rcu_read_unlock(); | |
246955fe RO |
1041 | } |
1042 | ||
28f7b036 | 1043 | static void nl_fib_input(struct sk_buff *skb) |
246955fe | 1044 | { |
6bd48fcf | 1045 | struct net *net; |
246955fe | 1046 | struct fib_result_nl *frn; |
28f7b036 | 1047 | struct nlmsghdr *nlh; |
15e47304 | 1048 | u32 portid; |
1194ed0a | 1049 | |
3b1e0a65 | 1050 | net = sock_net(skb->sk); |
b529ccf2 | 1051 | nlh = nlmsg_hdr(skb); |
573ce260 H |
1052 | if (skb->len < NLMSG_HDRLEN || skb->len < nlh->nlmsg_len || |
1053 | nlmsg_len(nlh) < sizeof(*frn)) | |
ea86575e | 1054 | return; |
d883a036 | 1055 | |
3a36515f | 1056 | skb = netlink_skb_clone(skb, GFP_KERNEL); |
51456b29 | 1057 | if (!skb) |
d883a036 DL |
1058 | return; |
1059 | nlh = nlmsg_hdr(skb); | |
e905a9ed | 1060 | |
573ce260 | 1061 | frn = (struct fib_result_nl *) nlmsg_data(nlh); |
345e9b54 | 1062 | nl_fib_lookup(net, frn); |
e905a9ed | 1063 | |
28a28283 | 1064 | portid = NETLINK_CB(skb).portid; /* netlink portid */ |
15e47304 | 1065 | NETLINK_CB(skb).portid = 0; /* from kernel */ |
ac6d439d | 1066 | NETLINK_CB(skb).dst_group = 0; /* unicast */ |
15e47304 | 1067 | netlink_unicast(net->ipv4.fibnl, skb, portid, MSG_DONTWAIT); |
e905a9ed | 1068 | } |
246955fe | 1069 | |
2c8c1e72 | 1070 | static int __net_init nl_fib_lookup_init(struct net *net) |
246955fe | 1071 | { |
6bd48fcf | 1072 | struct sock *sk; |
a31f2d17 PNA |
1073 | struct netlink_kernel_cfg cfg = { |
1074 | .input = nl_fib_input, | |
1075 | }; | |
1076 | ||
9f00d977 | 1077 | sk = netlink_kernel_create(net, NETLINK_FIB_LOOKUP, &cfg); |
51456b29 | 1078 | if (!sk) |
7b1a74fd | 1079 | return -EAFNOSUPPORT; |
6bd48fcf | 1080 | net->ipv4.fibnl = sk; |
7b1a74fd DL |
1081 | return 0; |
1082 | } | |
1083 | ||
1084 | static void nl_fib_lookup_exit(struct net *net) | |
1085 | { | |
b7c6ba6e | 1086 | netlink_kernel_release(net->ipv4.fibnl); |
775516bf | 1087 | net->ipv4.fibnl = NULL; |
246955fe RO |
1088 | } |
1089 | ||
8a3d0316 | 1090 | static void fib_disable_ip(struct net_device *dev, unsigned long event) |
1da177e4 | 1091 | { |
8a3d0316 | 1092 | if (fib_sync_down_dev(dev, event)) |
c346dca1 | 1093 | fib_flush(dev_net(dev)); |
4ccfe6d4 | 1094 | rt_cache_flush(dev_net(dev)); |
1da177e4 LT |
1095 | arp_ifdown(dev); |
1096 | } | |
1097 | ||
1098 | static int fib_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1099 | { | |
6ed2533e | 1100 | struct in_ifaddr *ifa = (struct in_ifaddr *)ptr; |
76e6ebfb | 1101 | struct net_device *dev = ifa->ifa_dev->dev; |
436c3b66 | 1102 | struct net *net = dev_net(dev); |
1da177e4 LT |
1103 | |
1104 | switch (event) { | |
1105 | case NETDEV_UP: | |
1106 | fib_add_ifaddr(ifa); | |
1107 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
8a3d0316 | 1108 | fib_sync_up(dev, RTNH_F_DEAD); |
1da177e4 | 1109 | #endif |
436c3b66 | 1110 | atomic_inc(&net->ipv4.dev_addr_genid); |
4ccfe6d4 | 1111 | rt_cache_flush(dev_net(dev)); |
1da177e4 LT |
1112 | break; |
1113 | case NETDEV_DOWN: | |
e6abbaa2 | 1114 | fib_del_ifaddr(ifa, NULL); |
436c3b66 | 1115 | atomic_inc(&net->ipv4.dev_addr_genid); |
51456b29 | 1116 | if (!ifa->ifa_dev->ifa_list) { |
1da177e4 | 1117 | /* Last address was deleted from this interface. |
6a31d2a9 | 1118 | * Disable IP. |
1da177e4 | 1119 | */ |
8a3d0316 | 1120 | fib_disable_ip(dev, event); |
1da177e4 | 1121 | } else { |
4ccfe6d4 | 1122 | rt_cache_flush(dev_net(dev)); |
1da177e4 LT |
1123 | } |
1124 | break; | |
1125 | } | |
1126 | return NOTIFY_DONE; | |
1127 | } | |
1128 | ||
1129 | static int fib_netdev_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1130 | { | |
351638e7 | 1131 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
0115e8e3 | 1132 | struct in_device *in_dev; |
436c3b66 | 1133 | struct net *net = dev_net(dev); |
8a3d0316 | 1134 | unsigned int flags; |
1da177e4 LT |
1135 | |
1136 | if (event == NETDEV_UNREGISTER) { | |
8a3d0316 | 1137 | fib_disable_ip(dev, event); |
caacf05e | 1138 | rt_flush_dev(dev); |
1da177e4 LT |
1139 | return NOTIFY_DONE; |
1140 | } | |
1141 | ||
0115e8e3 | 1142 | in_dev = __in_dev_get_rtnl(dev); |
a0065f26 OH |
1143 | if (!in_dev) |
1144 | return NOTIFY_DONE; | |
0115e8e3 | 1145 | |
1da177e4 LT |
1146 | switch (event) { |
1147 | case NETDEV_UP: | |
1148 | for_ifa(in_dev) { | |
1149 | fib_add_ifaddr(ifa); | |
1150 | } endfor_ifa(in_dev); | |
1151 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
8a3d0316 | 1152 | fib_sync_up(dev, RTNH_F_DEAD); |
1da177e4 | 1153 | #endif |
436c3b66 | 1154 | atomic_inc(&net->ipv4.dev_addr_genid); |
4ccfe6d4 | 1155 | rt_cache_flush(net); |
1da177e4 LT |
1156 | break; |
1157 | case NETDEV_DOWN: | |
8a3d0316 | 1158 | fib_disable_ip(dev, event); |
1da177e4 | 1159 | break; |
1da177e4 | 1160 | case NETDEV_CHANGE: |
8a3d0316 AG |
1161 | flags = dev_get_flags(dev); |
1162 | if (flags & (IFF_RUNNING | IFF_LOWER_UP)) | |
1163 | fib_sync_up(dev, RTNH_F_LINKDOWN); | |
1164 | else | |
1165 | fib_sync_down_dev(dev, event); | |
1166 | /* fall through */ | |
1167 | case NETDEV_CHANGEMTU: | |
4ccfe6d4 | 1168 | rt_cache_flush(net); |
1da177e4 LT |
1169 | break; |
1170 | } | |
1171 | return NOTIFY_DONE; | |
1172 | } | |
1173 | ||
1174 | static struct notifier_block fib_inetaddr_notifier = { | |
6ed2533e | 1175 | .notifier_call = fib_inetaddr_event, |
1da177e4 LT |
1176 | }; |
1177 | ||
1178 | static struct notifier_block fib_netdev_notifier = { | |
6ed2533e | 1179 | .notifier_call = fib_netdev_event, |
1da177e4 LT |
1180 | }; |
1181 | ||
7b1a74fd | 1182 | static int __net_init ip_fib_net_init(struct net *net) |
1da177e4 | 1183 | { |
dce5cbee | 1184 | int err; |
10da66f7 ED |
1185 | size_t size = sizeof(struct hlist_head) * FIB_TABLE_HASHSZ; |
1186 | ||
1187 | /* Avoid false sharing : Use at least a full cache line */ | |
1188 | size = max_t(size_t, size, L1_CACHE_BYTES); | |
1af5a8c4 | 1189 | |
10da66f7 | 1190 | net->ipv4.fib_table_hash = kzalloc(size, GFP_KERNEL); |
51456b29 | 1191 | if (!net->ipv4.fib_table_hash) |
e4aef8ae DL |
1192 | return -ENOMEM; |
1193 | ||
dce5cbee DL |
1194 | err = fib4_rules_init(net); |
1195 | if (err < 0) | |
1196 | goto fail; | |
1197 | return 0; | |
1198 | ||
1199 | fail: | |
1200 | kfree(net->ipv4.fib_table_hash); | |
1201 | return err; | |
7b1a74fd | 1202 | } |
1da177e4 | 1203 | |
2c8c1e72 | 1204 | static void ip_fib_net_exit(struct net *net) |
7b1a74fd DL |
1205 | { |
1206 | unsigned int i; | |
1207 | ||
6dede75b | 1208 | rtnl_lock(); |
6e47d6ca AD |
1209 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
1210 | RCU_INIT_POINTER(net->ipv4.fib_local, NULL); | |
1211 | RCU_INIT_POINTER(net->ipv4.fib_main, NULL); | |
1212 | RCU_INIT_POINTER(net->ipv4.fib_default, NULL); | |
1213 | #endif | |
7b1a74fd | 1214 | for (i = 0; i < FIB_TABLE_HASHSZ; i++) { |
a7e53531 | 1215 | struct hlist_head *head = &net->ipv4.fib_table_hash[i]; |
b67bfe0d | 1216 | struct hlist_node *tmp; |
a7e53531 AD |
1217 | struct fib_table *tb; |
1218 | ||
b67bfe0d SL |
1219 | hlist_for_each_entry_safe(tb, tmp, head, tb_hlist) { |
1220 | hlist_del(&tb->tb_hlist); | |
6e47d6ca | 1221 | fib_table_flush(tb); |
4aa2c466 | 1222 | fib_free_table(tb); |
7b1a74fd DL |
1223 | } |
1224 | } | |
ad88d051 AD |
1225 | |
1226 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
1227 | fib4_rules_exit(net); | |
1228 | #endif | |
e2666f84 | 1229 | rtnl_unlock(); |
e4aef8ae | 1230 | kfree(net->ipv4.fib_table_hash); |
7b1a74fd DL |
1231 | } |
1232 | ||
1233 | static int __net_init fib_net_init(struct net *net) | |
1234 | { | |
1235 | int error; | |
1236 | ||
f4530fa5 DM |
1237 | #ifdef CONFIG_IP_ROUTE_CLASSID |
1238 | net->ipv4.fib_num_tclassid_users = 0; | |
1239 | #endif | |
7b1a74fd DL |
1240 | error = ip_fib_net_init(net); |
1241 | if (error < 0) | |
1242 | goto out; | |
1243 | error = nl_fib_lookup_init(net); | |
1244 | if (error < 0) | |
1245 | goto out_nlfl; | |
1246 | error = fib_proc_init(net); | |
1247 | if (error < 0) | |
1248 | goto out_proc; | |
1249 | out: | |
1250 | return error; | |
1251 | ||
1252 | out_proc: | |
1253 | nl_fib_lookup_exit(net); | |
1254 | out_nlfl: | |
1255 | ip_fib_net_exit(net); | |
1256 | goto out; | |
1257 | } | |
1258 | ||
1259 | static void __net_exit fib_net_exit(struct net *net) | |
1260 | { | |
1261 | fib_proc_exit(net); | |
1262 | nl_fib_lookup_exit(net); | |
1263 | ip_fib_net_exit(net); | |
1264 | } | |
1265 | ||
1266 | static struct pernet_operations fib_net_ops = { | |
1267 | .init = fib_net_init, | |
1268 | .exit = fib_net_exit, | |
1269 | }; | |
1270 | ||
1271 | void __init ip_fib_init(void) | |
1272 | { | |
c7ac8679 GR |
1273 | rtnl_register(PF_INET, RTM_NEWROUTE, inet_rtm_newroute, NULL, NULL); |
1274 | rtnl_register(PF_INET, RTM_DELROUTE, inet_rtm_delroute, NULL, NULL); | |
1275 | rtnl_register(PF_INET, RTM_GETROUTE, NULL, inet_dump_fib, NULL); | |
7b1a74fd DL |
1276 | |
1277 | register_pernet_subsys(&fib_net_ops); | |
1278 | register_netdevice_notifier(&fib_netdev_notifier); | |
1279 | register_inetaddr_notifier(&fib_inetaddr_notifier); | |
7f9b8052 | 1280 | |
5348ba85 | 1281 | fib_trie_init(); |
1da177e4 | 1282 | } |