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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 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> |
1da177e4 | 48 | |
1da177e4 LT |
49 | #ifndef CONFIG_IP_MULTIPLE_TABLES |
50 | ||
7b1a74fd | 51 | static int __net_init fib4_rules_init(struct net *net) |
c3e9a353 | 52 | { |
93456b6d DL |
53 | struct fib_table *local_table, *main_table; |
54 | ||
5348ba85 | 55 | local_table = fib_trie_table(RT_TABLE_LOCAL); |
93456b6d | 56 | if (local_table == NULL) |
dbb50165 DL |
57 | return -ENOMEM; |
58 | ||
5348ba85 | 59 | main_table = fib_trie_table(RT_TABLE_MAIN); |
93456b6d | 60 | if (main_table == NULL) |
dbb50165 DL |
61 | goto fail; |
62 | ||
93456b6d | 63 | hlist_add_head_rcu(&local_table->tb_hlist, |
e4aef8ae | 64 | &net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX]); |
93456b6d | 65 | hlist_add_head_rcu(&main_table->tb_hlist, |
e4aef8ae | 66 | &net->ipv4.fib_table_hash[TABLE_MAIN_INDEX]); |
dbb50165 DL |
67 | return 0; |
68 | ||
69 | fail: | |
8274a97a | 70 | fib_free_table(local_table); |
dbb50165 | 71 | return -ENOMEM; |
c3e9a353 | 72 | } |
1af5a8c4 | 73 | #else |
1da177e4 | 74 | |
8ad4942c | 75 | struct fib_table *fib_new_table(struct net *net, u32 id) |
1da177e4 LT |
76 | { |
77 | struct fib_table *tb; | |
1af5a8c4 | 78 | unsigned int h; |
1da177e4 | 79 | |
1af5a8c4 PM |
80 | if (id == 0) |
81 | id = RT_TABLE_MAIN; | |
8ad4942c | 82 | tb = fib_get_table(net, id); |
1af5a8c4 PM |
83 | if (tb) |
84 | return tb; | |
7f9b8052 | 85 | |
5348ba85 | 86 | tb = fib_trie_table(id); |
1da177e4 LT |
87 | if (!tb) |
88 | return NULL; | |
f4530fa5 DM |
89 | |
90 | switch (id) { | |
91 | case RT_TABLE_LOCAL: | |
a7e53531 | 92 | rcu_assign_pointer(net->ipv4.fib_local, tb); |
f4530fa5 | 93 | break; |
f4530fa5 | 94 | case RT_TABLE_MAIN: |
a7e53531 | 95 | rcu_assign_pointer(net->ipv4.fib_main, tb); |
f4530fa5 | 96 | break; |
f4530fa5 | 97 | case RT_TABLE_DEFAULT: |
a7e53531 | 98 | rcu_assign_pointer(net->ipv4.fib_default, tb); |
f4530fa5 | 99 | break; |
f4530fa5 DM |
100 | default: |
101 | break; | |
102 | } | |
103 | ||
1af5a8c4 | 104 | h = id & (FIB_TABLE_HASHSZ - 1); |
e4aef8ae | 105 | hlist_add_head_rcu(&tb->tb_hlist, &net->ipv4.fib_table_hash[h]); |
1da177e4 LT |
106 | return tb; |
107 | } | |
108 | ||
345e9b54 | 109 | /* caller must hold either rtnl or rcu read lock */ |
8ad4942c | 110 | struct fib_table *fib_get_table(struct net *net, u32 id) |
1af5a8c4 PM |
111 | { |
112 | struct fib_table *tb; | |
e4aef8ae | 113 | struct hlist_head *head; |
1af5a8c4 | 114 | unsigned int h; |
1da177e4 | 115 | |
1af5a8c4 PM |
116 | if (id == 0) |
117 | id = RT_TABLE_MAIN; | |
118 | h = id & (FIB_TABLE_HASHSZ - 1); | |
e4aef8ae | 119 | |
e4aef8ae | 120 | head = &net->ipv4.fib_table_hash[h]; |
b67bfe0d | 121 | hlist_for_each_entry_rcu(tb, head, tb_hlist) { |
345e9b54 | 122 | if (tb->tb_id == id) |
1af5a8c4 | 123 | return tb; |
1af5a8c4 | 124 | } |
1af5a8c4 PM |
125 | return NULL; |
126 | } | |
1da177e4 LT |
127 | #endif /* CONFIG_IP_MULTIPLE_TABLES */ |
128 | ||
e4aef8ae | 129 | static void fib_flush(struct net *net) |
1da177e4 LT |
130 | { |
131 | int flushed = 0; | |
1af5a8c4 | 132 | unsigned int h; |
1da177e4 | 133 | |
1af5a8c4 | 134 | for (h = 0; h < FIB_TABLE_HASHSZ; h++) { |
a7e53531 AD |
135 | struct hlist_head *head = &net->ipv4.fib_table_hash[h]; |
136 | struct hlist_node *tmp; | |
137 | struct fib_table *tb; | |
138 | ||
139 | hlist_for_each_entry_safe(tb, tmp, head, tb_hlist) | |
16c6cf8b | 140 | flushed += fib_table_flush(tb); |
1da177e4 | 141 | } |
1da177e4 LT |
142 | |
143 | if (flushed) | |
4ccfe6d4 | 144 | rt_cache_flush(net); |
1da177e4 LT |
145 | } |
146 | ||
05538116 LAT |
147 | /* |
148 | * Find address type as if only "dev" was present in the system. If | |
149 | * on_dev is NULL then all interfaces are taken into consideration. | |
150 | */ | |
95c96174 ED |
151 | static inline unsigned int __inet_dev_addr_type(struct net *net, |
152 | const struct net_device *dev, | |
153 | __be32 addr) | |
1da177e4 | 154 | { |
9ade2286 | 155 | struct flowi4 fl4 = { .daddr = addr }; |
1da177e4 | 156 | struct fib_result res; |
95c96174 | 157 | unsigned int ret = RTN_BROADCAST; |
03cf786c | 158 | struct fib_table *local_table; |
1da177e4 | 159 | |
1e637c74 | 160 | if (ipv4_is_zeronet(addr) || ipv4_is_lbcast(addr)) |
1da177e4 | 161 | return RTN_BROADCAST; |
f97c1e0c | 162 | if (ipv4_is_multicast(addr)) |
1da177e4 LT |
163 | return RTN_MULTICAST; |
164 | ||
345e9b54 AD |
165 | rcu_read_lock(); |
166 | ||
6b175b26 | 167 | local_table = fib_get_table(net, RT_TABLE_LOCAL); |
03cf786c | 168 | if (local_table) { |
1da177e4 | 169 | ret = RTN_UNICAST; |
9ade2286 | 170 | if (!fib_table_lookup(local_table, &fl4, &res, FIB_LOOKUP_NOREF)) { |
05538116 LAT |
171 | if (!dev || dev == res.fi->fib_dev) |
172 | ret = res.type; | |
1da177e4 LT |
173 | } |
174 | } | |
345e9b54 AD |
175 | |
176 | rcu_read_unlock(); | |
1da177e4 LT |
177 | return ret; |
178 | } | |
179 | ||
6b175b26 | 180 | unsigned int inet_addr_type(struct net *net, __be32 addr) |
05538116 | 181 | { |
6b175b26 | 182 | return __inet_dev_addr_type(net, NULL, addr); |
05538116 | 183 | } |
4bc2f18b | 184 | EXPORT_SYMBOL(inet_addr_type); |
05538116 | 185 | |
6b175b26 EB |
186 | unsigned int inet_dev_addr_type(struct net *net, const struct net_device *dev, |
187 | __be32 addr) | |
05538116 | 188 | { |
6a31d2a9 | 189 | return __inet_dev_addr_type(net, dev, addr); |
05538116 | 190 | } |
4bc2f18b | 191 | EXPORT_SYMBOL(inet_dev_addr_type); |
05538116 | 192 | |
35ebf65e DM |
193 | __be32 fib_compute_spec_dst(struct sk_buff *skb) |
194 | { | |
195 | struct net_device *dev = skb->dev; | |
196 | struct in_device *in_dev; | |
197 | struct fib_result res; | |
a207a4b2 | 198 | struct rtable *rt; |
35ebf65e DM |
199 | struct flowi4 fl4; |
200 | struct net *net; | |
a207a4b2 | 201 | int scope; |
35ebf65e | 202 | |
a207a4b2 | 203 | rt = skb_rtable(skb); |
0cc535a2 JA |
204 | if ((rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST | RTCF_LOCAL)) == |
205 | RTCF_LOCAL) | |
35ebf65e DM |
206 | return ip_hdr(skb)->daddr; |
207 | ||
208 | in_dev = __in_dev_get_rcu(dev); | |
209 | BUG_ON(!in_dev); | |
35ebf65e DM |
210 | |
211 | net = dev_net(dev); | |
a207a4b2 DM |
212 | |
213 | scope = RT_SCOPE_UNIVERSE; | |
214 | if (!ipv4_is_zeronet(ip_hdr(skb)->saddr)) { | |
215 | fl4.flowi4_oif = 0; | |
1fb9489b | 216 | fl4.flowi4_iif = LOOPBACK_IFINDEX; |
a207a4b2 DM |
217 | fl4.daddr = ip_hdr(skb)->saddr; |
218 | fl4.saddr = 0; | |
219 | fl4.flowi4_tos = RT_TOS(ip_hdr(skb)->tos); | |
220 | fl4.flowi4_scope = scope; | |
221 | fl4.flowi4_mark = IN_DEV_SRC_VMARK(in_dev) ? skb->mark : 0; | |
222 | if (!fib_lookup(net, &fl4, &res)) | |
223 | return FIB_RES_PREFSRC(net, res); | |
224 | } else { | |
225 | scope = RT_SCOPE_LINK; | |
226 | } | |
227 | ||
228 | return inet_select_addr(dev, ip_hdr(skb)->saddr, scope); | |
35ebf65e DM |
229 | } |
230 | ||
1da177e4 | 231 | /* Given (packet source, input interface) and optional (dst, oif, tos): |
6a31d2a9 ED |
232 | * - (main) check, that source is valid i.e. not broadcast or our local |
233 | * address. | |
234 | * - figure out what "logical" interface this packet arrived | |
235 | * and calculate "specific destination" address. | |
236 | * - check, that packet arrived from expected physical interface. | |
ebc0ffae | 237 | * called with rcu_read_lock() |
1da177e4 | 238 | */ |
7a9bc9b8 DM |
239 | static int __fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst, |
240 | u8 tos, int oif, struct net_device *dev, | |
241 | int rpf, struct in_device *idev, u32 *itag) | |
1da177e4 | 242 | { |
1dced6a8 | 243 | int ret, no_addr; |
1da177e4 | 244 | struct fib_result res; |
9e56e380 | 245 | struct flowi4 fl4; |
5b707aaa | 246 | struct net *net; |
9e56e380 | 247 | bool dev_match; |
1da177e4 | 248 | |
9ade2286 | 249 | fl4.flowi4_oif = 0; |
6a662719 | 250 | fl4.flowi4_iif = oif ? : LOOPBACK_IFINDEX; |
9ade2286 DM |
251 | fl4.daddr = src; |
252 | fl4.saddr = dst; | |
253 | fl4.flowi4_tos = tos; | |
254 | fl4.flowi4_scope = RT_SCOPE_UNIVERSE; | |
cc7e17ea | 255 | |
9e56e380 | 256 | no_addr = idev->ifa_list == NULL; |
990078af | 257 | |
9e56e380 | 258 | fl4.flowi4_mark = IN_DEV_SRC_VMARK(idev) ? skb->mark : 0; |
1da177e4 | 259 | |
c346dca1 | 260 | net = dev_net(dev); |
9ade2286 | 261 | if (fib_lookup(net, &fl4, &res)) |
1da177e4 | 262 | goto last_resort; |
1dced6a8 SB |
263 | if (res.type != RTN_UNICAST && |
264 | (res.type != RTN_LOCAL || !IN_DEV_ACCEPT_LOCAL(idev))) | |
265 | goto e_inval; | |
266 | if (!rpf && !fib_num_tclassid_users(dev_net(dev)) && | |
267 | (dev->ifindex != oif || !IN_DEV_TX_REDIRECTS(idev))) | |
268 | goto last_resort; | |
1da177e4 | 269 | fib_combine_itag(itag, &res); |
6f86b325 DM |
270 | dev_match = false; |
271 | ||
1da177e4 | 272 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
6f86b325 DM |
273 | for (ret = 0; ret < res.fi->fib_nhs; ret++) { |
274 | struct fib_nh *nh = &res.fi->fib_nh[ret]; | |
275 | ||
276 | if (nh->nh_dev == dev) { | |
277 | dev_match = true; | |
278 | break; | |
279 | } | |
280 | } | |
1da177e4 LT |
281 | #else |
282 | if (FIB_RES_DEV(res) == dev) | |
6f86b325 | 283 | dev_match = true; |
1da177e4 | 284 | #endif |
6f86b325 | 285 | if (dev_match) { |
1da177e4 | 286 | ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST; |
1da177e4 LT |
287 | return ret; |
288 | } | |
1da177e4 LT |
289 | if (no_addr) |
290 | goto last_resort; | |
c1cf8422 | 291 | if (rpf == 1) |
b5f7e755 | 292 | goto e_rpf; |
9ade2286 | 293 | fl4.flowi4_oif = dev->ifindex; |
1da177e4 LT |
294 | |
295 | ret = 0; | |
9ade2286 | 296 | if (fib_lookup(net, &fl4, &res) == 0) { |
41347dcd | 297 | if (res.type == RTN_UNICAST) |
1da177e4 | 298 | ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST; |
1da177e4 LT |
299 | } |
300 | return ret; | |
301 | ||
302 | last_resort: | |
303 | if (rpf) | |
b5f7e755 | 304 | goto e_rpf; |
1da177e4 LT |
305 | *itag = 0; |
306 | return 0; | |
307 | ||
1da177e4 LT |
308 | e_inval: |
309 | return -EINVAL; | |
b5f7e755 ED |
310 | e_rpf: |
311 | return -EXDEV; | |
1da177e4 LT |
312 | } |
313 | ||
7a9bc9b8 DM |
314 | /* Ignore rp_filter for packets protected by IPsec. */ |
315 | int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst, | |
316 | u8 tos, int oif, struct net_device *dev, | |
317 | struct in_device *idev, u32 *itag) | |
318 | { | |
319 | int r = secpath_exists(skb) ? 0 : IN_DEV_RPFILTER(idev); | |
320 | ||
e81da0e1 | 321 | if (!r && !fib_num_tclassid_users(dev_net(dev)) && |
1dced6a8 | 322 | IN_DEV_ACCEPT_LOCAL(idev) && |
e81da0e1 | 323 | (dev->ifindex != oif || !IN_DEV_TX_REDIRECTS(idev))) { |
7a9bc9b8 DM |
324 | *itag = 0; |
325 | return 0; | |
326 | } | |
327 | return __fib_validate_source(skb, src, dst, tos, oif, dev, r, idev, itag); | |
328 | } | |
329 | ||
81f7bf6c | 330 | static inline __be32 sk_extract_addr(struct sockaddr *addr) |
4e902c57 TG |
331 | { |
332 | return ((struct sockaddr_in *) addr)->sin_addr.s_addr; | |
333 | } | |
334 | ||
335 | static int put_rtax(struct nlattr *mx, int len, int type, u32 value) | |
336 | { | |
337 | struct nlattr *nla; | |
338 | ||
339 | nla = (struct nlattr *) ((char *) mx + len); | |
340 | nla->nla_type = type; | |
341 | nla->nla_len = nla_attr_size(4); | |
342 | *(u32 *) nla_data(nla) = value; | |
343 | ||
344 | return len + nla_total_size(4); | |
345 | } | |
346 | ||
4b5d47d4 | 347 | static int rtentry_to_fib_config(struct net *net, int cmd, struct rtentry *rt, |
4e902c57 TG |
348 | struct fib_config *cfg) |
349 | { | |
6d85c10a | 350 | __be32 addr; |
4e902c57 TG |
351 | int plen; |
352 | ||
353 | memset(cfg, 0, sizeof(*cfg)); | |
4b5d47d4 | 354 | cfg->fc_nlinfo.nl_net = net; |
4e902c57 TG |
355 | |
356 | if (rt->rt_dst.sa_family != AF_INET) | |
357 | return -EAFNOSUPPORT; | |
358 | ||
359 | /* | |
360 | * Check mask for validity: | |
361 | * a) it must be contiguous. | |
362 | * b) destination must have all host bits clear. | |
363 | * c) if application forgot to set correct family (AF_INET), | |
364 | * reject request unless it is absolutely clear i.e. | |
365 | * both family and mask are zero. | |
366 | */ | |
367 | plen = 32; | |
368 | addr = sk_extract_addr(&rt->rt_dst); | |
369 | if (!(rt->rt_flags & RTF_HOST)) { | |
81f7bf6c | 370 | __be32 mask = sk_extract_addr(&rt->rt_genmask); |
4e902c57 TG |
371 | |
372 | if (rt->rt_genmask.sa_family != AF_INET) { | |
373 | if (mask || rt->rt_genmask.sa_family) | |
374 | return -EAFNOSUPPORT; | |
375 | } | |
376 | ||
377 | if (bad_mask(mask, addr)) | |
378 | return -EINVAL; | |
379 | ||
380 | plen = inet_mask_len(mask); | |
381 | } | |
382 | ||
383 | cfg->fc_dst_len = plen; | |
384 | cfg->fc_dst = addr; | |
385 | ||
386 | if (cmd != SIOCDELRT) { | |
387 | cfg->fc_nlflags = NLM_F_CREATE; | |
388 | cfg->fc_protocol = RTPROT_BOOT; | |
389 | } | |
390 | ||
391 | if (rt->rt_metric) | |
392 | cfg->fc_priority = rt->rt_metric - 1; | |
393 | ||
394 | if (rt->rt_flags & RTF_REJECT) { | |
395 | cfg->fc_scope = RT_SCOPE_HOST; | |
396 | cfg->fc_type = RTN_UNREACHABLE; | |
397 | return 0; | |
398 | } | |
399 | ||
400 | cfg->fc_scope = RT_SCOPE_NOWHERE; | |
401 | cfg->fc_type = RTN_UNICAST; | |
402 | ||
403 | if (rt->rt_dev) { | |
404 | char *colon; | |
405 | struct net_device *dev; | |
406 | char devname[IFNAMSIZ]; | |
407 | ||
408 | if (copy_from_user(devname, rt->rt_dev, IFNAMSIZ-1)) | |
409 | return -EFAULT; | |
410 | ||
411 | devname[IFNAMSIZ-1] = 0; | |
412 | colon = strchr(devname, ':'); | |
413 | if (colon) | |
414 | *colon = 0; | |
4b5d47d4 | 415 | dev = __dev_get_by_name(net, devname); |
4e902c57 TG |
416 | if (!dev) |
417 | return -ENODEV; | |
418 | cfg->fc_oif = dev->ifindex; | |
419 | if (colon) { | |
420 | struct in_ifaddr *ifa; | |
421 | struct in_device *in_dev = __in_dev_get_rtnl(dev); | |
422 | if (!in_dev) | |
423 | return -ENODEV; | |
424 | *colon = ':'; | |
425 | for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) | |
426 | if (strcmp(ifa->ifa_label, devname) == 0) | |
427 | break; | |
428 | if (ifa == NULL) | |
429 | return -ENODEV; | |
430 | cfg->fc_prefsrc = ifa->ifa_local; | |
431 | } | |
432 | } | |
433 | ||
434 | addr = sk_extract_addr(&rt->rt_gateway); | |
435 | if (rt->rt_gateway.sa_family == AF_INET && addr) { | |
436 | cfg->fc_gw = addr; | |
437 | if (rt->rt_flags & RTF_GATEWAY && | |
4b5d47d4 | 438 | inet_addr_type(net, addr) == RTN_UNICAST) |
4e902c57 TG |
439 | cfg->fc_scope = RT_SCOPE_UNIVERSE; |
440 | } | |
441 | ||
442 | if (cmd == SIOCDELRT) | |
443 | return 0; | |
444 | ||
445 | if (rt->rt_flags & RTF_GATEWAY && !cfg->fc_gw) | |
446 | return -EINVAL; | |
447 | ||
448 | if (cfg->fc_scope == RT_SCOPE_NOWHERE) | |
449 | cfg->fc_scope = RT_SCOPE_LINK; | |
450 | ||
451 | if (rt->rt_flags & (RTF_MTU | RTF_WINDOW | RTF_IRTT)) { | |
452 | struct nlattr *mx; | |
453 | int len = 0; | |
454 | ||
455 | mx = kzalloc(3 * nla_total_size(4), GFP_KERNEL); | |
e905a9ed | 456 | if (mx == NULL) |
4e902c57 TG |
457 | return -ENOMEM; |
458 | ||
459 | if (rt->rt_flags & RTF_MTU) | |
460 | len = put_rtax(mx, len, RTAX_ADVMSS, rt->rt_mtu - 40); | |
461 | ||
462 | if (rt->rt_flags & RTF_WINDOW) | |
463 | len = put_rtax(mx, len, RTAX_WINDOW, rt->rt_window); | |
464 | ||
465 | if (rt->rt_flags & RTF_IRTT) | |
466 | len = put_rtax(mx, len, RTAX_RTT, rt->rt_irtt << 3); | |
467 | ||
468 | cfg->fc_mx = mx; | |
469 | cfg->fc_mx_len = len; | |
470 | } | |
471 | ||
472 | return 0; | |
473 | } | |
474 | ||
1da177e4 | 475 | /* |
6a31d2a9 ED |
476 | * Handle IP routing ioctl calls. |
477 | * These are used to manipulate the routing tables | |
1da177e4 | 478 | */ |
1bad118a | 479 | int ip_rt_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
1da177e4 | 480 | { |
4e902c57 TG |
481 | struct fib_config cfg; |
482 | struct rtentry rt; | |
1da177e4 | 483 | int err; |
1da177e4 LT |
484 | |
485 | switch (cmd) { | |
486 | case SIOCADDRT: /* Add a route */ | |
487 | case SIOCDELRT: /* Delete a route */ | |
52e804c6 | 488 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 | 489 | return -EPERM; |
4e902c57 TG |
490 | |
491 | if (copy_from_user(&rt, arg, sizeof(rt))) | |
1da177e4 | 492 | return -EFAULT; |
4e902c57 | 493 | |
1da177e4 | 494 | rtnl_lock(); |
1bad118a | 495 | err = rtentry_to_fib_config(net, cmd, &rt, &cfg); |
1da177e4 | 496 | if (err == 0) { |
4e902c57 TG |
497 | struct fib_table *tb; |
498 | ||
1da177e4 | 499 | if (cmd == SIOCDELRT) { |
1bad118a | 500 | tb = fib_get_table(net, cfg.fc_table); |
1da177e4 | 501 | if (tb) |
16c6cf8b | 502 | err = fib_table_delete(tb, &cfg); |
4e902c57 TG |
503 | else |
504 | err = -ESRCH; | |
1da177e4 | 505 | } else { |
1bad118a | 506 | tb = fib_new_table(net, cfg.fc_table); |
1da177e4 | 507 | if (tb) |
16c6cf8b | 508 | err = fib_table_insert(tb, &cfg); |
4e902c57 TG |
509 | else |
510 | err = -ENOBUFS; | |
1da177e4 | 511 | } |
4e902c57 TG |
512 | |
513 | /* allocated by rtentry_to_fib_config() */ | |
514 | kfree(cfg.fc_mx); | |
1da177e4 LT |
515 | } |
516 | rtnl_unlock(); | |
517 | return err; | |
518 | } | |
519 | return -EINVAL; | |
520 | } | |
521 | ||
6a31d2a9 | 522 | const struct nla_policy rtm_ipv4_policy[RTA_MAX + 1] = { |
4e902c57 TG |
523 | [RTA_DST] = { .type = NLA_U32 }, |
524 | [RTA_SRC] = { .type = NLA_U32 }, | |
525 | [RTA_IIF] = { .type = NLA_U32 }, | |
526 | [RTA_OIF] = { .type = NLA_U32 }, | |
527 | [RTA_GATEWAY] = { .type = NLA_U32 }, | |
528 | [RTA_PRIORITY] = { .type = NLA_U32 }, | |
529 | [RTA_PREFSRC] = { .type = NLA_U32 }, | |
530 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
5176f91e | 531 | [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) }, |
4e902c57 | 532 | [RTA_FLOW] = { .type = NLA_U32 }, |
4e902c57 TG |
533 | }; |
534 | ||
4b5d47d4 | 535 | static int rtm_to_fib_config(struct net *net, struct sk_buff *skb, |
6a31d2a9 | 536 | struct nlmsghdr *nlh, struct fib_config *cfg) |
1da177e4 | 537 | { |
4e902c57 TG |
538 | struct nlattr *attr; |
539 | int err, remaining; | |
540 | struct rtmsg *rtm; | |
541 | ||
542 | err = nlmsg_validate(nlh, sizeof(*rtm), RTA_MAX, rtm_ipv4_policy); | |
543 | if (err < 0) | |
544 | goto errout; | |
545 | ||
546 | memset(cfg, 0, sizeof(*cfg)); | |
547 | ||
548 | rtm = nlmsg_data(nlh); | |
4e902c57 | 549 | cfg->fc_dst_len = rtm->rtm_dst_len; |
4e902c57 TG |
550 | cfg->fc_tos = rtm->rtm_tos; |
551 | cfg->fc_table = rtm->rtm_table; | |
552 | cfg->fc_protocol = rtm->rtm_protocol; | |
553 | cfg->fc_scope = rtm->rtm_scope; | |
554 | cfg->fc_type = rtm->rtm_type; | |
555 | cfg->fc_flags = rtm->rtm_flags; | |
556 | cfg->fc_nlflags = nlh->nlmsg_flags; | |
557 | ||
15e47304 | 558 | cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid; |
4e902c57 | 559 | cfg->fc_nlinfo.nlh = nlh; |
4b5d47d4 | 560 | cfg->fc_nlinfo.nl_net = net; |
4e902c57 | 561 | |
a0ee18b9 TG |
562 | if (cfg->fc_type > RTN_MAX) { |
563 | err = -EINVAL; | |
564 | goto errout; | |
565 | } | |
566 | ||
4e902c57 | 567 | nlmsg_for_each_attr(attr, nlh, sizeof(struct rtmsg), remaining) { |
8f4c1f9b | 568 | switch (nla_type(attr)) { |
4e902c57 | 569 | case RTA_DST: |
17fb2c64 | 570 | cfg->fc_dst = nla_get_be32(attr); |
4e902c57 | 571 | break; |
4e902c57 TG |
572 | case RTA_OIF: |
573 | cfg->fc_oif = nla_get_u32(attr); | |
574 | break; | |
575 | case RTA_GATEWAY: | |
17fb2c64 | 576 | cfg->fc_gw = nla_get_be32(attr); |
4e902c57 TG |
577 | break; |
578 | case RTA_PRIORITY: | |
579 | cfg->fc_priority = nla_get_u32(attr); | |
580 | break; | |
581 | case RTA_PREFSRC: | |
17fb2c64 | 582 | cfg->fc_prefsrc = nla_get_be32(attr); |
4e902c57 TG |
583 | break; |
584 | case RTA_METRICS: | |
585 | cfg->fc_mx = nla_data(attr); | |
586 | cfg->fc_mx_len = nla_len(attr); | |
587 | break; | |
588 | case RTA_MULTIPATH: | |
589 | cfg->fc_mp = nla_data(attr); | |
590 | cfg->fc_mp_len = nla_len(attr); | |
591 | break; | |
592 | case RTA_FLOW: | |
593 | cfg->fc_flow = nla_get_u32(attr); | |
594 | break; | |
4e902c57 TG |
595 | case RTA_TABLE: |
596 | cfg->fc_table = nla_get_u32(attr); | |
597 | break; | |
1da177e4 LT |
598 | } |
599 | } | |
4e902c57 | 600 | |
1da177e4 | 601 | return 0; |
4e902c57 TG |
602 | errout: |
603 | return err; | |
1da177e4 LT |
604 | } |
605 | ||
661d2967 | 606 | static int inet_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh) |
1da177e4 | 607 | { |
3b1e0a65 | 608 | struct net *net = sock_net(skb->sk); |
4e902c57 TG |
609 | struct fib_config cfg; |
610 | struct fib_table *tb; | |
611 | int err; | |
1da177e4 | 612 | |
4b5d47d4 | 613 | err = rtm_to_fib_config(net, skb, nlh, &cfg); |
4e902c57 TG |
614 | if (err < 0) |
615 | goto errout; | |
1da177e4 | 616 | |
8ad4942c | 617 | tb = fib_get_table(net, cfg.fc_table); |
4e902c57 TG |
618 | if (tb == NULL) { |
619 | err = -ESRCH; | |
620 | goto errout; | |
621 | } | |
622 | ||
16c6cf8b | 623 | err = fib_table_delete(tb, &cfg); |
4e902c57 TG |
624 | errout: |
625 | return err; | |
1da177e4 LT |
626 | } |
627 | ||
661d2967 | 628 | static int inet_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh) |
1da177e4 | 629 | { |
3b1e0a65 | 630 | struct net *net = sock_net(skb->sk); |
4e902c57 TG |
631 | struct fib_config cfg; |
632 | struct fib_table *tb; | |
633 | int err; | |
1da177e4 | 634 | |
4b5d47d4 | 635 | err = rtm_to_fib_config(net, skb, nlh, &cfg); |
4e902c57 TG |
636 | if (err < 0) |
637 | goto errout; | |
1da177e4 | 638 | |
226b0b4a | 639 | tb = fib_new_table(net, cfg.fc_table); |
4e902c57 TG |
640 | if (tb == NULL) { |
641 | err = -ENOBUFS; | |
642 | goto errout; | |
643 | } | |
644 | ||
16c6cf8b | 645 | err = fib_table_insert(tb, &cfg); |
4e902c57 TG |
646 | errout: |
647 | return err; | |
1da177e4 LT |
648 | } |
649 | ||
63f3444f | 650 | static int inet_dump_fib(struct sk_buff *skb, struct netlink_callback *cb) |
1da177e4 | 651 | { |
3b1e0a65 | 652 | struct net *net = sock_net(skb->sk); |
1af5a8c4 PM |
653 | unsigned int h, s_h; |
654 | unsigned int e = 0, s_e; | |
1da177e4 | 655 | struct fib_table *tb; |
e4aef8ae | 656 | struct hlist_head *head; |
1af5a8c4 | 657 | int dumped = 0; |
1da177e4 | 658 | |
be403ea1 TG |
659 | if (nlmsg_len(cb->nlh) >= sizeof(struct rtmsg) && |
660 | ((struct rtmsg *) nlmsg_data(cb->nlh))->rtm_flags & RTM_F_CLONED) | |
0b8c7f6f | 661 | return skb->len; |
1da177e4 | 662 | |
1af5a8c4 PM |
663 | s_h = cb->args[0]; |
664 | s_e = cb->args[1]; | |
665 | ||
a7e53531 AD |
666 | rcu_read_lock(); |
667 | ||
1af5a8c4 PM |
668 | for (h = s_h; h < FIB_TABLE_HASHSZ; h++, s_e = 0) { |
669 | e = 0; | |
e4aef8ae | 670 | head = &net->ipv4.fib_table_hash[h]; |
a7e53531 | 671 | hlist_for_each_entry_rcu(tb, head, tb_hlist) { |
1af5a8c4 PM |
672 | if (e < s_e) |
673 | goto next; | |
674 | if (dumped) | |
675 | memset(&cb->args[2], 0, sizeof(cb->args) - | |
e905a9ed | 676 | 2 * sizeof(cb->args[0])); |
16c6cf8b | 677 | if (fib_table_dump(tb, skb, cb) < 0) |
1af5a8c4 PM |
678 | goto out; |
679 | dumped = 1; | |
680 | next: | |
681 | e++; | |
682 | } | |
1da177e4 | 683 | } |
1af5a8c4 | 684 | out: |
a7e53531 AD |
685 | rcu_read_unlock(); |
686 | ||
1af5a8c4 PM |
687 | cb->args[1] = e; |
688 | cb->args[0] = h; | |
1da177e4 LT |
689 | |
690 | return skb->len; | |
691 | } | |
692 | ||
693 | /* Prepare and feed intra-kernel routing request. | |
6a31d2a9 ED |
694 | * Really, it should be netlink message, but :-( netlink |
695 | * can be not configured, so that we feed it directly | |
696 | * to fib engine. It is legal, because all events occur | |
697 | * only when netlink is already locked. | |
1da177e4 | 698 | */ |
81f7bf6c | 699 | static void fib_magic(int cmd, int type, __be32 dst, int dst_len, struct in_ifaddr *ifa) |
1da177e4 | 700 | { |
c346dca1 | 701 | struct net *net = dev_net(ifa->ifa_dev->dev); |
4e902c57 TG |
702 | struct fib_table *tb; |
703 | struct fib_config cfg = { | |
704 | .fc_protocol = RTPROT_KERNEL, | |
705 | .fc_type = type, | |
706 | .fc_dst = dst, | |
707 | .fc_dst_len = dst_len, | |
708 | .fc_prefsrc = ifa->ifa_local, | |
709 | .fc_oif = ifa->ifa_dev->dev->ifindex, | |
710 | .fc_nlflags = NLM_F_CREATE | NLM_F_APPEND, | |
4d1169c1 | 711 | .fc_nlinfo = { |
4b5d47d4 | 712 | .nl_net = net, |
4d1169c1 | 713 | }, |
4e902c57 | 714 | }; |
1da177e4 LT |
715 | |
716 | if (type == RTN_UNICAST) | |
4b5d47d4 | 717 | tb = fib_new_table(net, RT_TABLE_MAIN); |
1da177e4 | 718 | else |
4b5d47d4 | 719 | tb = fib_new_table(net, RT_TABLE_LOCAL); |
1da177e4 LT |
720 | |
721 | if (tb == NULL) | |
722 | return; | |
723 | ||
4e902c57 | 724 | cfg.fc_table = tb->tb_id; |
1da177e4 | 725 | |
4e902c57 TG |
726 | if (type != RTN_LOCAL) |
727 | cfg.fc_scope = RT_SCOPE_LINK; | |
728 | else | |
729 | cfg.fc_scope = RT_SCOPE_HOST; | |
1da177e4 LT |
730 | |
731 | if (cmd == RTM_NEWROUTE) | |
16c6cf8b | 732 | fib_table_insert(tb, &cfg); |
1da177e4 | 733 | else |
16c6cf8b | 734 | fib_table_delete(tb, &cfg); |
1da177e4 LT |
735 | } |
736 | ||
0ff60a45 | 737 | void fib_add_ifaddr(struct in_ifaddr *ifa) |
1da177e4 LT |
738 | { |
739 | struct in_device *in_dev = ifa->ifa_dev; | |
740 | struct net_device *dev = in_dev->dev; | |
741 | struct in_ifaddr *prim = ifa; | |
a144ea4b AV |
742 | __be32 mask = ifa->ifa_mask; |
743 | __be32 addr = ifa->ifa_local; | |
6a31d2a9 | 744 | __be32 prefix = ifa->ifa_address & mask; |
1da177e4 | 745 | |
6a31d2a9 | 746 | if (ifa->ifa_flags & IFA_F_SECONDARY) { |
1da177e4 LT |
747 | prim = inet_ifa_byprefix(in_dev, prefix, mask); |
748 | if (prim == NULL) { | |
058bd4d2 | 749 | pr_warn("%s: bug: prim == NULL\n", __func__); |
1da177e4 LT |
750 | return; |
751 | } | |
752 | } | |
753 | ||
754 | fib_magic(RTM_NEWROUTE, RTN_LOCAL, addr, 32, prim); | |
755 | ||
6a31d2a9 | 756 | if (!(dev->flags & IFF_UP)) |
1da177e4 LT |
757 | return; |
758 | ||
759 | /* Add broadcast address, if it is explicitly assigned. */ | |
a144ea4b | 760 | if (ifa->ifa_broadcast && ifa->ifa_broadcast != htonl(0xFFFFFFFF)) |
1da177e4 LT |
761 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim); |
762 | ||
6a31d2a9 | 763 | if (!ipv4_is_zeronet(prefix) && !(ifa->ifa_flags & IFA_F_SECONDARY) && |
1da177e4 | 764 | (prefix != addr || ifa->ifa_prefixlen < 32)) { |
6a31d2a9 ED |
765 | fib_magic(RTM_NEWROUTE, |
766 | dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST, | |
767 | prefix, ifa->ifa_prefixlen, prim); | |
1da177e4 LT |
768 | |
769 | /* Add network specific broadcasts, when it takes a sense */ | |
770 | if (ifa->ifa_prefixlen < 31) { | |
771 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix, 32, prim); | |
6a31d2a9 ED |
772 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix | ~mask, |
773 | 32, prim); | |
1da177e4 LT |
774 | } |
775 | } | |
776 | } | |
777 | ||
e6abbaa2 JA |
778 | /* Delete primary or secondary address. |
779 | * Optionally, on secondary address promotion consider the addresses | |
780 | * from subnet iprim as deleted, even if they are in device list. | |
781 | * In this case the secondary ifa can be in device list. | |
782 | */ | |
783 | void fib_del_ifaddr(struct in_ifaddr *ifa, struct in_ifaddr *iprim) | |
1da177e4 LT |
784 | { |
785 | struct in_device *in_dev = ifa->ifa_dev; | |
786 | struct net_device *dev = in_dev->dev; | |
787 | struct in_ifaddr *ifa1; | |
e6abbaa2 | 788 | struct in_ifaddr *prim = ifa, *prim1 = NULL; |
6a31d2a9 ED |
789 | __be32 brd = ifa->ifa_address | ~ifa->ifa_mask; |
790 | __be32 any = ifa->ifa_address & ifa->ifa_mask; | |
1da177e4 LT |
791 | #define LOCAL_OK 1 |
792 | #define BRD_OK 2 | |
793 | #define BRD0_OK 4 | |
794 | #define BRD1_OK 8 | |
95c96174 | 795 | unsigned int ok = 0; |
e6abbaa2 JA |
796 | int subnet = 0; /* Primary network */ |
797 | int gone = 1; /* Address is missing */ | |
798 | int same_prefsrc = 0; /* Another primary with same IP */ | |
1da177e4 | 799 | |
e6abbaa2 | 800 | if (ifa->ifa_flags & IFA_F_SECONDARY) { |
1da177e4 LT |
801 | prim = inet_ifa_byprefix(in_dev, any, ifa->ifa_mask); |
802 | if (prim == NULL) { | |
058bd4d2 | 803 | pr_warn("%s: bug: prim == NULL\n", __func__); |
1da177e4 LT |
804 | return; |
805 | } | |
e6abbaa2 | 806 | if (iprim && iprim != prim) { |
058bd4d2 | 807 | pr_warn("%s: bug: iprim != prim\n", __func__); |
e6abbaa2 JA |
808 | return; |
809 | } | |
810 | } else if (!ipv4_is_zeronet(any) && | |
811 | (any != ifa->ifa_local || ifa->ifa_prefixlen < 32)) { | |
812 | fib_magic(RTM_DELROUTE, | |
813 | dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST, | |
814 | any, ifa->ifa_prefixlen, prim); | |
815 | subnet = 1; | |
1da177e4 LT |
816 | } |
817 | ||
818 | /* Deletion is more complicated than add. | |
6a31d2a9 ED |
819 | * We should take care of not to delete too much :-) |
820 | * | |
821 | * Scan address list to be sure that addresses are really gone. | |
1da177e4 LT |
822 | */ |
823 | ||
824 | for (ifa1 = in_dev->ifa_list; ifa1; ifa1 = ifa1->ifa_next) { | |
e6abbaa2 JA |
825 | if (ifa1 == ifa) { |
826 | /* promotion, keep the IP */ | |
827 | gone = 0; | |
828 | continue; | |
829 | } | |
830 | /* Ignore IFAs from our subnet */ | |
831 | if (iprim && ifa1->ifa_mask == iprim->ifa_mask && | |
832 | inet_ifa_match(ifa1->ifa_address, iprim)) | |
833 | continue; | |
834 | ||
835 | /* Ignore ifa1 if it uses different primary IP (prefsrc) */ | |
836 | if (ifa1->ifa_flags & IFA_F_SECONDARY) { | |
837 | /* Another address from our subnet? */ | |
838 | if (ifa1->ifa_mask == prim->ifa_mask && | |
839 | inet_ifa_match(ifa1->ifa_address, prim)) | |
840 | prim1 = prim; | |
841 | else { | |
842 | /* We reached the secondaries, so | |
843 | * same_prefsrc should be determined. | |
844 | */ | |
845 | if (!same_prefsrc) | |
846 | continue; | |
847 | /* Search new prim1 if ifa1 is not | |
848 | * using the current prim1 | |
849 | */ | |
850 | if (!prim1 || | |
851 | ifa1->ifa_mask != prim1->ifa_mask || | |
852 | !inet_ifa_match(ifa1->ifa_address, prim1)) | |
853 | prim1 = inet_ifa_byprefix(in_dev, | |
854 | ifa1->ifa_address, | |
855 | ifa1->ifa_mask); | |
856 | if (!prim1) | |
857 | continue; | |
858 | if (prim1->ifa_local != prim->ifa_local) | |
859 | continue; | |
860 | } | |
861 | } else { | |
862 | if (prim->ifa_local != ifa1->ifa_local) | |
863 | continue; | |
864 | prim1 = ifa1; | |
865 | if (prim != prim1) | |
866 | same_prefsrc = 1; | |
867 | } | |
1da177e4 LT |
868 | if (ifa->ifa_local == ifa1->ifa_local) |
869 | ok |= LOCAL_OK; | |
870 | if (ifa->ifa_broadcast == ifa1->ifa_broadcast) | |
871 | ok |= BRD_OK; | |
872 | if (brd == ifa1->ifa_broadcast) | |
873 | ok |= BRD1_OK; | |
874 | if (any == ifa1->ifa_broadcast) | |
875 | ok |= BRD0_OK; | |
e6abbaa2 JA |
876 | /* primary has network specific broadcasts */ |
877 | if (prim1 == ifa1 && ifa1->ifa_prefixlen < 31) { | |
878 | __be32 brd1 = ifa1->ifa_address | ~ifa1->ifa_mask; | |
879 | __be32 any1 = ifa1->ifa_address & ifa1->ifa_mask; | |
880 | ||
881 | if (!ipv4_is_zeronet(any1)) { | |
882 | if (ifa->ifa_broadcast == brd1 || | |
883 | ifa->ifa_broadcast == any1) | |
884 | ok |= BRD_OK; | |
885 | if (brd == brd1 || brd == any1) | |
886 | ok |= BRD1_OK; | |
887 | if (any == brd1 || any == any1) | |
888 | ok |= BRD0_OK; | |
889 | } | |
890 | } | |
1da177e4 LT |
891 | } |
892 | ||
6a31d2a9 | 893 | if (!(ok & BRD_OK)) |
1da177e4 | 894 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim); |
e6abbaa2 JA |
895 | if (subnet && ifa->ifa_prefixlen < 31) { |
896 | if (!(ok & BRD1_OK)) | |
897 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, brd, 32, prim); | |
898 | if (!(ok & BRD0_OK)) | |
899 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, any, 32, prim); | |
900 | } | |
6a31d2a9 | 901 | if (!(ok & LOCAL_OK)) { |
1da177e4 LT |
902 | fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 32, prim); |
903 | ||
904 | /* Check, that this local address finally disappeared. */ | |
e6abbaa2 JA |
905 | if (gone && |
906 | inet_addr_type(dev_net(dev), ifa->ifa_local) != RTN_LOCAL) { | |
1da177e4 | 907 | /* And the last, but not the least thing. |
6a31d2a9 ED |
908 | * We must flush stray FIB entries. |
909 | * | |
910 | * First of all, we scan fib_info list searching | |
911 | * for stray nexthop entries, then ignite fib_flush. | |
912 | */ | |
c346dca1 YH |
913 | if (fib_sync_down_addr(dev_net(dev), ifa->ifa_local)) |
914 | fib_flush(dev_net(dev)); | |
1da177e4 LT |
915 | } |
916 | } | |
917 | #undef LOCAL_OK | |
918 | #undef BRD_OK | |
919 | #undef BRD0_OK | |
920 | #undef BRD1_OK | |
921 | } | |
922 | ||
345e9b54 | 923 | static void nl_fib_lookup(struct net *net, struct fib_result_nl *frn) |
246955fe | 924 | { |
e905a9ed | 925 | |
246955fe | 926 | struct fib_result res; |
9ade2286 DM |
927 | struct flowi4 fl4 = { |
928 | .flowi4_mark = frn->fl_mark, | |
929 | .daddr = frn->fl_addr, | |
930 | .flowi4_tos = frn->fl_tos, | |
931 | .flowi4_scope = frn->fl_scope, | |
6a31d2a9 | 932 | }; |
345e9b54 AD |
933 | struct fib_table *tb; |
934 | ||
935 | rcu_read_lock(); | |
936 | ||
937 | tb = fib_get_table(net, frn->tb_id_in); | |
1194ed0a AK |
938 | |
939 | frn->err = -ENOENT; | |
246955fe RO |
940 | if (tb) { |
941 | local_bh_disable(); | |
942 | ||
943 | frn->tb_id = tb->tb_id; | |
9ade2286 | 944 | frn->err = fib_table_lookup(tb, &fl4, &res, FIB_LOOKUP_NOREF); |
246955fe RO |
945 | |
946 | if (!frn->err) { | |
947 | frn->prefixlen = res.prefixlen; | |
948 | frn->nh_sel = res.nh_sel; | |
949 | frn->type = res.type; | |
950 | frn->scope = res.scope; | |
951 | } | |
952 | local_bh_enable(); | |
953 | } | |
345e9b54 AD |
954 | |
955 | rcu_read_unlock(); | |
246955fe RO |
956 | } |
957 | ||
28f7b036 | 958 | static void nl_fib_input(struct sk_buff *skb) |
246955fe | 959 | { |
6bd48fcf | 960 | struct net *net; |
246955fe | 961 | struct fib_result_nl *frn; |
28f7b036 | 962 | struct nlmsghdr *nlh; |
15e47304 | 963 | u32 portid; |
1194ed0a | 964 | |
3b1e0a65 | 965 | net = sock_net(skb->sk); |
b529ccf2 | 966 | nlh = nlmsg_hdr(skb); |
573ce260 H |
967 | if (skb->len < NLMSG_HDRLEN || skb->len < nlh->nlmsg_len || |
968 | nlmsg_len(nlh) < sizeof(*frn)) | |
ea86575e | 969 | return; |
d883a036 | 970 | |
3a36515f | 971 | skb = netlink_skb_clone(skb, GFP_KERNEL); |
d883a036 DL |
972 | if (skb == NULL) |
973 | return; | |
974 | nlh = nlmsg_hdr(skb); | |
e905a9ed | 975 | |
573ce260 | 976 | frn = (struct fib_result_nl *) nlmsg_data(nlh); |
345e9b54 | 977 | nl_fib_lookup(net, frn); |
e905a9ed | 978 | |
28a28283 | 979 | portid = NETLINK_CB(skb).portid; /* netlink portid */ |
15e47304 | 980 | NETLINK_CB(skb).portid = 0; /* from kernel */ |
ac6d439d | 981 | NETLINK_CB(skb).dst_group = 0; /* unicast */ |
15e47304 | 982 | netlink_unicast(net->ipv4.fibnl, skb, portid, MSG_DONTWAIT); |
e905a9ed | 983 | } |
246955fe | 984 | |
2c8c1e72 | 985 | static int __net_init nl_fib_lookup_init(struct net *net) |
246955fe | 986 | { |
6bd48fcf | 987 | struct sock *sk; |
a31f2d17 PNA |
988 | struct netlink_kernel_cfg cfg = { |
989 | .input = nl_fib_input, | |
990 | }; | |
991 | ||
9f00d977 | 992 | sk = netlink_kernel_create(net, NETLINK_FIB_LOOKUP, &cfg); |
6bd48fcf | 993 | if (sk == NULL) |
7b1a74fd | 994 | return -EAFNOSUPPORT; |
6bd48fcf | 995 | net->ipv4.fibnl = sk; |
7b1a74fd DL |
996 | return 0; |
997 | } | |
998 | ||
999 | static void nl_fib_lookup_exit(struct net *net) | |
1000 | { | |
b7c6ba6e | 1001 | netlink_kernel_release(net->ipv4.fibnl); |
775516bf | 1002 | net->ipv4.fibnl = NULL; |
246955fe RO |
1003 | } |
1004 | ||
4ccfe6d4 | 1005 | static void fib_disable_ip(struct net_device *dev, int force) |
1da177e4 | 1006 | { |
85326fa5 | 1007 | if (fib_sync_down_dev(dev, force)) |
c346dca1 | 1008 | fib_flush(dev_net(dev)); |
4ccfe6d4 | 1009 | rt_cache_flush(dev_net(dev)); |
1da177e4 LT |
1010 | arp_ifdown(dev); |
1011 | } | |
1012 | ||
1013 | static int fib_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1014 | { | |
6ed2533e | 1015 | struct in_ifaddr *ifa = (struct in_ifaddr *)ptr; |
76e6ebfb | 1016 | struct net_device *dev = ifa->ifa_dev->dev; |
436c3b66 | 1017 | struct net *net = dev_net(dev); |
1da177e4 LT |
1018 | |
1019 | switch (event) { | |
1020 | case NETDEV_UP: | |
1021 | fib_add_ifaddr(ifa); | |
1022 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
76e6ebfb | 1023 | fib_sync_up(dev); |
1da177e4 | 1024 | #endif |
436c3b66 | 1025 | atomic_inc(&net->ipv4.dev_addr_genid); |
4ccfe6d4 | 1026 | rt_cache_flush(dev_net(dev)); |
1da177e4 LT |
1027 | break; |
1028 | case NETDEV_DOWN: | |
e6abbaa2 | 1029 | fib_del_ifaddr(ifa, NULL); |
436c3b66 | 1030 | atomic_inc(&net->ipv4.dev_addr_genid); |
9fcc2e8a | 1031 | if (ifa->ifa_dev->ifa_list == NULL) { |
1da177e4 | 1032 | /* Last address was deleted from this interface. |
6a31d2a9 | 1033 | * Disable IP. |
1da177e4 | 1034 | */ |
4ccfe6d4 | 1035 | fib_disable_ip(dev, 1); |
1da177e4 | 1036 | } else { |
4ccfe6d4 | 1037 | rt_cache_flush(dev_net(dev)); |
1da177e4 LT |
1038 | } |
1039 | break; | |
1040 | } | |
1041 | return NOTIFY_DONE; | |
1042 | } | |
1043 | ||
1044 | static int fib_netdev_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1045 | { | |
351638e7 | 1046 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
0115e8e3 | 1047 | struct in_device *in_dev; |
436c3b66 | 1048 | struct net *net = dev_net(dev); |
1da177e4 LT |
1049 | |
1050 | if (event == NETDEV_UNREGISTER) { | |
4ccfe6d4 | 1051 | fib_disable_ip(dev, 2); |
caacf05e | 1052 | rt_flush_dev(dev); |
1da177e4 LT |
1053 | return NOTIFY_DONE; |
1054 | } | |
1055 | ||
0115e8e3 | 1056 | in_dev = __in_dev_get_rtnl(dev); |
a0065f26 OH |
1057 | if (!in_dev) |
1058 | return NOTIFY_DONE; | |
0115e8e3 | 1059 | |
1da177e4 LT |
1060 | switch (event) { |
1061 | case NETDEV_UP: | |
1062 | for_ifa(in_dev) { | |
1063 | fib_add_ifaddr(ifa); | |
1064 | } endfor_ifa(in_dev); | |
1065 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
1066 | fib_sync_up(dev); | |
1067 | #endif | |
436c3b66 | 1068 | atomic_inc(&net->ipv4.dev_addr_genid); |
4ccfe6d4 | 1069 | rt_cache_flush(net); |
1da177e4 LT |
1070 | break; |
1071 | case NETDEV_DOWN: | |
4ccfe6d4 | 1072 | fib_disable_ip(dev, 0); |
1da177e4 LT |
1073 | break; |
1074 | case NETDEV_CHANGEMTU: | |
1075 | case NETDEV_CHANGE: | |
4ccfe6d4 | 1076 | rt_cache_flush(net); |
1da177e4 LT |
1077 | break; |
1078 | } | |
1079 | return NOTIFY_DONE; | |
1080 | } | |
1081 | ||
1082 | static struct notifier_block fib_inetaddr_notifier = { | |
6ed2533e | 1083 | .notifier_call = fib_inetaddr_event, |
1da177e4 LT |
1084 | }; |
1085 | ||
1086 | static struct notifier_block fib_netdev_notifier = { | |
6ed2533e | 1087 | .notifier_call = fib_netdev_event, |
1da177e4 LT |
1088 | }; |
1089 | ||
7b1a74fd | 1090 | static int __net_init ip_fib_net_init(struct net *net) |
1da177e4 | 1091 | { |
dce5cbee | 1092 | int err; |
10da66f7 ED |
1093 | size_t size = sizeof(struct hlist_head) * FIB_TABLE_HASHSZ; |
1094 | ||
1095 | /* Avoid false sharing : Use at least a full cache line */ | |
1096 | size = max_t(size_t, size, L1_CACHE_BYTES); | |
1af5a8c4 | 1097 | |
10da66f7 | 1098 | net->ipv4.fib_table_hash = kzalloc(size, GFP_KERNEL); |
e4aef8ae DL |
1099 | if (net->ipv4.fib_table_hash == NULL) |
1100 | return -ENOMEM; | |
1101 | ||
dce5cbee DL |
1102 | err = fib4_rules_init(net); |
1103 | if (err < 0) | |
1104 | goto fail; | |
1105 | return 0; | |
1106 | ||
1107 | fail: | |
1108 | kfree(net->ipv4.fib_table_hash); | |
1109 | return err; | |
7b1a74fd | 1110 | } |
1da177e4 | 1111 | |
2c8c1e72 | 1112 | static void ip_fib_net_exit(struct net *net) |
7b1a74fd DL |
1113 | { |
1114 | unsigned int i; | |
1115 | ||
1116 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
1117 | fib4_rules_exit(net); | |
1118 | #endif | |
1119 | ||
e2666f84 | 1120 | rtnl_lock(); |
7b1a74fd | 1121 | for (i = 0; i < FIB_TABLE_HASHSZ; i++) { |
a7e53531 | 1122 | struct hlist_head *head = &net->ipv4.fib_table_hash[i]; |
b67bfe0d | 1123 | struct hlist_node *tmp; |
a7e53531 AD |
1124 | struct fib_table *tb; |
1125 | ||
1126 | /* this is done in two passes as flushing the table could | |
1127 | * cause it to be reallocated in order to accommodate new | |
1128 | * tnodes at the root as the table shrinks. | |
1129 | */ | |
1130 | hlist_for_each_entry_safe(tb, tmp, head, tb_hlist) | |
1131 | fib_table_flush(tb); | |
63f3444f | 1132 | |
b67bfe0d | 1133 | hlist_for_each_entry_safe(tb, tmp, head, tb_hlist) { |
a7e53531 AD |
1134 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
1135 | switch (tb->tb_id) { | |
1136 | case RT_TABLE_LOCAL: | |
1137 | RCU_INIT_POINTER(net->ipv4.fib_local, NULL); | |
1138 | break; | |
1139 | case RT_TABLE_MAIN: | |
1140 | RCU_INIT_POINTER(net->ipv4.fib_main, NULL); | |
1141 | break; | |
1142 | case RT_TABLE_DEFAULT: | |
1143 | RCU_INIT_POINTER(net->ipv4.fib_default, NULL); | |
1144 | break; | |
1145 | default: | |
1146 | break; | |
1147 | } | |
1148 | #endif | |
b67bfe0d | 1149 | hlist_del(&tb->tb_hlist); |
4aa2c466 | 1150 | fib_free_table(tb); |
7b1a74fd DL |
1151 | } |
1152 | } | |
e2666f84 | 1153 | rtnl_unlock(); |
e4aef8ae | 1154 | kfree(net->ipv4.fib_table_hash); |
7b1a74fd DL |
1155 | } |
1156 | ||
1157 | static int __net_init fib_net_init(struct net *net) | |
1158 | { | |
1159 | int error; | |
1160 | ||
f4530fa5 DM |
1161 | #ifdef CONFIG_IP_ROUTE_CLASSID |
1162 | net->ipv4.fib_num_tclassid_users = 0; | |
1163 | #endif | |
7b1a74fd DL |
1164 | error = ip_fib_net_init(net); |
1165 | if (error < 0) | |
1166 | goto out; | |
1167 | error = nl_fib_lookup_init(net); | |
1168 | if (error < 0) | |
1169 | goto out_nlfl; | |
1170 | error = fib_proc_init(net); | |
1171 | if (error < 0) | |
1172 | goto out_proc; | |
1173 | out: | |
1174 | return error; | |
1175 | ||
1176 | out_proc: | |
1177 | nl_fib_lookup_exit(net); | |
1178 | out_nlfl: | |
1179 | ip_fib_net_exit(net); | |
1180 | goto out; | |
1181 | } | |
1182 | ||
1183 | static void __net_exit fib_net_exit(struct net *net) | |
1184 | { | |
1185 | fib_proc_exit(net); | |
1186 | nl_fib_lookup_exit(net); | |
1187 | ip_fib_net_exit(net); | |
1188 | } | |
1189 | ||
1190 | static struct pernet_operations fib_net_ops = { | |
1191 | .init = fib_net_init, | |
1192 | .exit = fib_net_exit, | |
1193 | }; | |
1194 | ||
1195 | void __init ip_fib_init(void) | |
1196 | { | |
c7ac8679 GR |
1197 | rtnl_register(PF_INET, RTM_NEWROUTE, inet_rtm_newroute, NULL, NULL); |
1198 | rtnl_register(PF_INET, RTM_DELROUTE, inet_rtm_delroute, NULL, NULL); | |
1199 | rtnl_register(PF_INET, RTM_GETROUTE, NULL, inet_dump_fib, NULL); | |
7b1a74fd DL |
1200 | |
1201 | register_pernet_subsys(&fib_net_ops); | |
1202 | register_netdevice_notifier(&fib_netdev_notifier); | |
1203 | register_inetaddr_notifier(&fib_inetaddr_notifier); | |
7f9b8052 | 1204 | |
5348ba85 | 1205 | fib_trie_init(); |
1da177e4 | 1206 | } |