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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: | |
93456b6d | 70 | kfree(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: | |
92 | net->ipv4.fib_local = tb; | |
93 | break; | |
94 | ||
95 | case RT_TABLE_MAIN: | |
96 | net->ipv4.fib_main = tb; | |
97 | break; | |
98 | ||
99 | case RT_TABLE_DEFAULT: | |
100 | net->ipv4.fib_default = tb; | |
101 | break; | |
102 | ||
103 | default: | |
104 | break; | |
105 | } | |
106 | ||
1af5a8c4 | 107 | h = id & (FIB_TABLE_HASHSZ - 1); |
e4aef8ae | 108 | hlist_add_head_rcu(&tb->tb_hlist, &net->ipv4.fib_table_hash[h]); |
1da177e4 LT |
109 | return tb; |
110 | } | |
111 | ||
8ad4942c | 112 | struct fib_table *fib_get_table(struct net *net, u32 id) |
1af5a8c4 PM |
113 | { |
114 | struct fib_table *tb; | |
115 | struct hlist_node *node; | |
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 | |
1af5a8c4 | 123 | rcu_read_lock(); |
e4aef8ae DL |
124 | head = &net->ipv4.fib_table_hash[h]; |
125 | hlist_for_each_entry_rcu(tb, node, head, tb_hlist) { | |
1af5a8c4 PM |
126 | if (tb->tb_id == id) { |
127 | rcu_read_unlock(); | |
128 | return tb; | |
129 | } | |
130 | } | |
131 | rcu_read_unlock(); | |
132 | return NULL; | |
133 | } | |
1da177e4 LT |
134 | #endif /* CONFIG_IP_MULTIPLE_TABLES */ |
135 | ||
e4aef8ae | 136 | static void fib_flush(struct net *net) |
1da177e4 LT |
137 | { |
138 | int flushed = 0; | |
1da177e4 | 139 | struct fib_table *tb; |
1af5a8c4 | 140 | struct hlist_node *node; |
e4aef8ae | 141 | struct hlist_head *head; |
1af5a8c4 | 142 | unsigned int h; |
1da177e4 | 143 | |
1af5a8c4 | 144 | for (h = 0; h < FIB_TABLE_HASHSZ; h++) { |
e4aef8ae DL |
145 | head = &net->ipv4.fib_table_hash[h]; |
146 | hlist_for_each_entry(tb, node, head, tb_hlist) | |
16c6cf8b | 147 | flushed += fib_table_flush(tb); |
1da177e4 | 148 | } |
1da177e4 LT |
149 | |
150 | if (flushed) | |
4ccfe6d4 | 151 | rt_cache_flush(net); |
1da177e4 LT |
152 | } |
153 | ||
05538116 LAT |
154 | /* |
155 | * Find address type as if only "dev" was present in the system. If | |
156 | * on_dev is NULL then all interfaces are taken into consideration. | |
157 | */ | |
95c96174 ED |
158 | static inline unsigned int __inet_dev_addr_type(struct net *net, |
159 | const struct net_device *dev, | |
160 | __be32 addr) | |
1da177e4 | 161 | { |
9ade2286 | 162 | struct flowi4 fl4 = { .daddr = addr }; |
1da177e4 | 163 | struct fib_result res; |
95c96174 | 164 | unsigned int ret = RTN_BROADCAST; |
03cf786c | 165 | struct fib_table *local_table; |
1da177e4 | 166 | |
1e637c74 | 167 | if (ipv4_is_zeronet(addr) || ipv4_is_lbcast(addr)) |
1da177e4 | 168 | return RTN_BROADCAST; |
f97c1e0c | 169 | if (ipv4_is_multicast(addr)) |
1da177e4 LT |
170 | return RTN_MULTICAST; |
171 | ||
6b175b26 | 172 | local_table = fib_get_table(net, RT_TABLE_LOCAL); |
03cf786c | 173 | if (local_table) { |
1da177e4 | 174 | ret = RTN_UNICAST; |
ebc0ffae | 175 | rcu_read_lock(); |
9ade2286 | 176 | if (!fib_table_lookup(local_table, &fl4, &res, FIB_LOOKUP_NOREF)) { |
05538116 LAT |
177 | if (!dev || dev == res.fi->fib_dev) |
178 | ret = res.type; | |
1da177e4 | 179 | } |
ebc0ffae | 180 | rcu_read_unlock(); |
1da177e4 LT |
181 | } |
182 | return ret; | |
183 | } | |
184 | ||
6b175b26 | 185 | unsigned int inet_addr_type(struct net *net, __be32 addr) |
05538116 | 186 | { |
6b175b26 | 187 | return __inet_dev_addr_type(net, NULL, addr); |
05538116 | 188 | } |
4bc2f18b | 189 | EXPORT_SYMBOL(inet_addr_type); |
05538116 | 190 | |
6b175b26 EB |
191 | unsigned int inet_dev_addr_type(struct net *net, const struct net_device *dev, |
192 | __be32 addr) | |
05538116 | 193 | { |
6a31d2a9 | 194 | return __inet_dev_addr_type(net, dev, addr); |
05538116 | 195 | } |
4bc2f18b | 196 | EXPORT_SYMBOL(inet_dev_addr_type); |
05538116 | 197 | |
35ebf65e DM |
198 | __be32 fib_compute_spec_dst(struct sk_buff *skb) |
199 | { | |
200 | struct net_device *dev = skb->dev; | |
201 | struct in_device *in_dev; | |
202 | struct fib_result res; | |
a207a4b2 | 203 | struct rtable *rt; |
35ebf65e DM |
204 | struct flowi4 fl4; |
205 | struct net *net; | |
a207a4b2 | 206 | int scope; |
35ebf65e | 207 | |
a207a4b2 | 208 | rt = skb_rtable(skb); |
0cc535a2 JA |
209 | if ((rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST | RTCF_LOCAL)) == |
210 | RTCF_LOCAL) | |
35ebf65e DM |
211 | return ip_hdr(skb)->daddr; |
212 | ||
213 | in_dev = __in_dev_get_rcu(dev); | |
214 | BUG_ON(!in_dev); | |
35ebf65e DM |
215 | |
216 | net = dev_net(dev); | |
a207a4b2 DM |
217 | |
218 | scope = RT_SCOPE_UNIVERSE; | |
219 | if (!ipv4_is_zeronet(ip_hdr(skb)->saddr)) { | |
220 | fl4.flowi4_oif = 0; | |
1fb9489b | 221 | fl4.flowi4_iif = LOOPBACK_IFINDEX; |
a207a4b2 DM |
222 | fl4.daddr = ip_hdr(skb)->saddr; |
223 | fl4.saddr = 0; | |
224 | fl4.flowi4_tos = RT_TOS(ip_hdr(skb)->tos); | |
225 | fl4.flowi4_scope = scope; | |
226 | fl4.flowi4_mark = IN_DEV_SRC_VMARK(in_dev) ? skb->mark : 0; | |
227 | if (!fib_lookup(net, &fl4, &res)) | |
228 | return FIB_RES_PREFSRC(net, res); | |
229 | } else { | |
230 | scope = RT_SCOPE_LINK; | |
231 | } | |
232 | ||
233 | return inet_select_addr(dev, ip_hdr(skb)->saddr, scope); | |
35ebf65e DM |
234 | } |
235 | ||
1da177e4 | 236 | /* Given (packet source, input interface) and optional (dst, oif, tos): |
6a31d2a9 ED |
237 | * - (main) check, that source is valid i.e. not broadcast or our local |
238 | * address. | |
239 | * - figure out what "logical" interface this packet arrived | |
240 | * and calculate "specific destination" address. | |
241 | * - check, that packet arrived from expected physical interface. | |
ebc0ffae | 242 | * called with rcu_read_lock() |
1da177e4 | 243 | */ |
7a9bc9b8 DM |
244 | static int __fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst, |
245 | u8 tos, int oif, struct net_device *dev, | |
246 | int rpf, struct in_device *idev, u32 *itag) | |
1da177e4 | 247 | { |
7a9bc9b8 | 248 | int ret, no_addr, accept_local; |
1da177e4 | 249 | struct fib_result res; |
9e56e380 | 250 | struct flowi4 fl4; |
5b707aaa | 251 | struct net *net; |
9e56e380 | 252 | bool dev_match; |
1da177e4 | 253 | |
9ade2286 DM |
254 | fl4.flowi4_oif = 0; |
255 | fl4.flowi4_iif = oif; | |
9ade2286 DM |
256 | fl4.daddr = src; |
257 | fl4.saddr = dst; | |
258 | fl4.flowi4_tos = tos; | |
259 | fl4.flowi4_scope = RT_SCOPE_UNIVERSE; | |
cc7e17ea | 260 | |
9e56e380 | 261 | no_addr = idev->ifa_list == NULL; |
990078af | 262 | |
9e56e380 DM |
263 | accept_local = IN_DEV_ACCEPT_LOCAL(idev); |
264 | fl4.flowi4_mark = IN_DEV_SRC_VMARK(idev) ? skb->mark : 0; | |
1da177e4 | 265 | |
c346dca1 | 266 | net = dev_net(dev); |
9ade2286 | 267 | if (fib_lookup(net, &fl4, &res)) |
1da177e4 | 268 | goto last_resort; |
8153a10c PM |
269 | if (res.type != RTN_UNICAST) { |
270 | if (res.type != RTN_LOCAL || !accept_local) | |
ebc0ffae | 271 | goto e_inval; |
8153a10c | 272 | } |
1da177e4 | 273 | fib_combine_itag(itag, &res); |
6f86b325 DM |
274 | dev_match = false; |
275 | ||
1da177e4 | 276 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
6f86b325 DM |
277 | for (ret = 0; ret < res.fi->fib_nhs; ret++) { |
278 | struct fib_nh *nh = &res.fi->fib_nh[ret]; | |
279 | ||
280 | if (nh->nh_dev == dev) { | |
281 | dev_match = true; | |
282 | break; | |
283 | } | |
284 | } | |
1da177e4 LT |
285 | #else |
286 | if (FIB_RES_DEV(res) == dev) | |
6f86b325 | 287 | dev_match = true; |
1da177e4 | 288 | #endif |
6f86b325 | 289 | if (dev_match) { |
1da177e4 | 290 | ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST; |
1da177e4 LT |
291 | return ret; |
292 | } | |
1da177e4 LT |
293 | if (no_addr) |
294 | goto last_resort; | |
c1cf8422 | 295 | if (rpf == 1) |
b5f7e755 | 296 | goto e_rpf; |
9ade2286 | 297 | fl4.flowi4_oif = dev->ifindex; |
1da177e4 LT |
298 | |
299 | ret = 0; | |
9ade2286 | 300 | if (fib_lookup(net, &fl4, &res) == 0) { |
41347dcd | 301 | if (res.type == RTN_UNICAST) |
1da177e4 | 302 | ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST; |
1da177e4 LT |
303 | } |
304 | return ret; | |
305 | ||
306 | last_resort: | |
307 | if (rpf) | |
b5f7e755 | 308 | goto e_rpf; |
1da177e4 LT |
309 | *itag = 0; |
310 | return 0; | |
311 | ||
1da177e4 LT |
312 | e_inval: |
313 | return -EINVAL; | |
b5f7e755 ED |
314 | e_rpf: |
315 | return -EXDEV; | |
1da177e4 LT |
316 | } |
317 | ||
7a9bc9b8 DM |
318 | /* Ignore rp_filter for packets protected by IPsec. */ |
319 | int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst, | |
320 | u8 tos, int oif, struct net_device *dev, | |
321 | struct in_device *idev, u32 *itag) | |
322 | { | |
323 | int r = secpath_exists(skb) ? 0 : IN_DEV_RPFILTER(idev); | |
324 | ||
e81da0e1 JA |
325 | if (!r && !fib_num_tclassid_users(dev_net(dev)) && |
326 | (dev->ifindex != oif || !IN_DEV_TX_REDIRECTS(idev))) { | |
7a9bc9b8 DM |
327 | *itag = 0; |
328 | return 0; | |
329 | } | |
330 | return __fib_validate_source(skb, src, dst, tos, oif, dev, r, idev, itag); | |
331 | } | |
332 | ||
81f7bf6c | 333 | static inline __be32 sk_extract_addr(struct sockaddr *addr) |
4e902c57 TG |
334 | { |
335 | return ((struct sockaddr_in *) addr)->sin_addr.s_addr; | |
336 | } | |
337 | ||
338 | static int put_rtax(struct nlattr *mx, int len, int type, u32 value) | |
339 | { | |
340 | struct nlattr *nla; | |
341 | ||
342 | nla = (struct nlattr *) ((char *) mx + len); | |
343 | nla->nla_type = type; | |
344 | nla->nla_len = nla_attr_size(4); | |
345 | *(u32 *) nla_data(nla) = value; | |
346 | ||
347 | return len + nla_total_size(4); | |
348 | } | |
349 | ||
4b5d47d4 | 350 | static int rtentry_to_fib_config(struct net *net, int cmd, struct rtentry *rt, |
4e902c57 TG |
351 | struct fib_config *cfg) |
352 | { | |
6d85c10a | 353 | __be32 addr; |
4e902c57 TG |
354 | int plen; |
355 | ||
356 | memset(cfg, 0, sizeof(*cfg)); | |
4b5d47d4 | 357 | cfg->fc_nlinfo.nl_net = net; |
4e902c57 TG |
358 | |
359 | if (rt->rt_dst.sa_family != AF_INET) | |
360 | return -EAFNOSUPPORT; | |
361 | ||
362 | /* | |
363 | * Check mask for validity: | |
364 | * a) it must be contiguous. | |
365 | * b) destination must have all host bits clear. | |
366 | * c) if application forgot to set correct family (AF_INET), | |
367 | * reject request unless it is absolutely clear i.e. | |
368 | * both family and mask are zero. | |
369 | */ | |
370 | plen = 32; | |
371 | addr = sk_extract_addr(&rt->rt_dst); | |
372 | if (!(rt->rt_flags & RTF_HOST)) { | |
81f7bf6c | 373 | __be32 mask = sk_extract_addr(&rt->rt_genmask); |
4e902c57 TG |
374 | |
375 | if (rt->rt_genmask.sa_family != AF_INET) { | |
376 | if (mask || rt->rt_genmask.sa_family) | |
377 | return -EAFNOSUPPORT; | |
378 | } | |
379 | ||
380 | if (bad_mask(mask, addr)) | |
381 | return -EINVAL; | |
382 | ||
383 | plen = inet_mask_len(mask); | |
384 | } | |
385 | ||
386 | cfg->fc_dst_len = plen; | |
387 | cfg->fc_dst = addr; | |
388 | ||
389 | if (cmd != SIOCDELRT) { | |
390 | cfg->fc_nlflags = NLM_F_CREATE; | |
391 | cfg->fc_protocol = RTPROT_BOOT; | |
392 | } | |
393 | ||
394 | if (rt->rt_metric) | |
395 | cfg->fc_priority = rt->rt_metric - 1; | |
396 | ||
397 | if (rt->rt_flags & RTF_REJECT) { | |
398 | cfg->fc_scope = RT_SCOPE_HOST; | |
399 | cfg->fc_type = RTN_UNREACHABLE; | |
400 | return 0; | |
401 | } | |
402 | ||
403 | cfg->fc_scope = RT_SCOPE_NOWHERE; | |
404 | cfg->fc_type = RTN_UNICAST; | |
405 | ||
406 | if (rt->rt_dev) { | |
407 | char *colon; | |
408 | struct net_device *dev; | |
409 | char devname[IFNAMSIZ]; | |
410 | ||
411 | if (copy_from_user(devname, rt->rt_dev, IFNAMSIZ-1)) | |
412 | return -EFAULT; | |
413 | ||
414 | devname[IFNAMSIZ-1] = 0; | |
415 | colon = strchr(devname, ':'); | |
416 | if (colon) | |
417 | *colon = 0; | |
4b5d47d4 | 418 | dev = __dev_get_by_name(net, devname); |
4e902c57 TG |
419 | if (!dev) |
420 | return -ENODEV; | |
421 | cfg->fc_oif = dev->ifindex; | |
422 | if (colon) { | |
423 | struct in_ifaddr *ifa; | |
424 | struct in_device *in_dev = __in_dev_get_rtnl(dev); | |
425 | if (!in_dev) | |
426 | return -ENODEV; | |
427 | *colon = ':'; | |
428 | for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) | |
429 | if (strcmp(ifa->ifa_label, devname) == 0) | |
430 | break; | |
431 | if (ifa == NULL) | |
432 | return -ENODEV; | |
433 | cfg->fc_prefsrc = ifa->ifa_local; | |
434 | } | |
435 | } | |
436 | ||
437 | addr = sk_extract_addr(&rt->rt_gateway); | |
438 | if (rt->rt_gateway.sa_family == AF_INET && addr) { | |
439 | cfg->fc_gw = addr; | |
440 | if (rt->rt_flags & RTF_GATEWAY && | |
4b5d47d4 | 441 | inet_addr_type(net, addr) == RTN_UNICAST) |
4e902c57 TG |
442 | cfg->fc_scope = RT_SCOPE_UNIVERSE; |
443 | } | |
444 | ||
445 | if (cmd == SIOCDELRT) | |
446 | return 0; | |
447 | ||
448 | if (rt->rt_flags & RTF_GATEWAY && !cfg->fc_gw) | |
449 | return -EINVAL; | |
450 | ||
451 | if (cfg->fc_scope == RT_SCOPE_NOWHERE) | |
452 | cfg->fc_scope = RT_SCOPE_LINK; | |
453 | ||
454 | if (rt->rt_flags & (RTF_MTU | RTF_WINDOW | RTF_IRTT)) { | |
455 | struct nlattr *mx; | |
456 | int len = 0; | |
457 | ||
458 | mx = kzalloc(3 * nla_total_size(4), GFP_KERNEL); | |
e905a9ed | 459 | if (mx == NULL) |
4e902c57 TG |
460 | return -ENOMEM; |
461 | ||
462 | if (rt->rt_flags & RTF_MTU) | |
463 | len = put_rtax(mx, len, RTAX_ADVMSS, rt->rt_mtu - 40); | |
464 | ||
465 | if (rt->rt_flags & RTF_WINDOW) | |
466 | len = put_rtax(mx, len, RTAX_WINDOW, rt->rt_window); | |
467 | ||
468 | if (rt->rt_flags & RTF_IRTT) | |
469 | len = put_rtax(mx, len, RTAX_RTT, rt->rt_irtt << 3); | |
470 | ||
471 | cfg->fc_mx = mx; | |
472 | cfg->fc_mx_len = len; | |
473 | } | |
474 | ||
475 | return 0; | |
476 | } | |
477 | ||
1da177e4 | 478 | /* |
6a31d2a9 ED |
479 | * Handle IP routing ioctl calls. |
480 | * These are used to manipulate the routing tables | |
1da177e4 | 481 | */ |
1bad118a | 482 | int ip_rt_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
1da177e4 | 483 | { |
4e902c57 TG |
484 | struct fib_config cfg; |
485 | struct rtentry rt; | |
1da177e4 | 486 | int err; |
1da177e4 LT |
487 | |
488 | switch (cmd) { | |
489 | case SIOCADDRT: /* Add a route */ | |
490 | case SIOCDELRT: /* Delete a route */ | |
491 | if (!capable(CAP_NET_ADMIN)) | |
492 | return -EPERM; | |
4e902c57 TG |
493 | |
494 | if (copy_from_user(&rt, arg, sizeof(rt))) | |
1da177e4 | 495 | return -EFAULT; |
4e902c57 | 496 | |
1da177e4 | 497 | rtnl_lock(); |
1bad118a | 498 | err = rtentry_to_fib_config(net, cmd, &rt, &cfg); |
1da177e4 | 499 | if (err == 0) { |
4e902c57 TG |
500 | struct fib_table *tb; |
501 | ||
1da177e4 | 502 | if (cmd == SIOCDELRT) { |
1bad118a | 503 | tb = fib_get_table(net, cfg.fc_table); |
1da177e4 | 504 | if (tb) |
16c6cf8b | 505 | err = fib_table_delete(tb, &cfg); |
4e902c57 TG |
506 | else |
507 | err = -ESRCH; | |
1da177e4 | 508 | } else { |
1bad118a | 509 | tb = fib_new_table(net, cfg.fc_table); |
1da177e4 | 510 | if (tb) |
16c6cf8b | 511 | err = fib_table_insert(tb, &cfg); |
4e902c57 TG |
512 | else |
513 | err = -ENOBUFS; | |
1da177e4 | 514 | } |
4e902c57 TG |
515 | |
516 | /* allocated by rtentry_to_fib_config() */ | |
517 | kfree(cfg.fc_mx); | |
1da177e4 LT |
518 | } |
519 | rtnl_unlock(); | |
520 | return err; | |
521 | } | |
522 | return -EINVAL; | |
523 | } | |
524 | ||
6a31d2a9 | 525 | const struct nla_policy rtm_ipv4_policy[RTA_MAX + 1] = { |
4e902c57 TG |
526 | [RTA_DST] = { .type = NLA_U32 }, |
527 | [RTA_SRC] = { .type = NLA_U32 }, | |
528 | [RTA_IIF] = { .type = NLA_U32 }, | |
529 | [RTA_OIF] = { .type = NLA_U32 }, | |
530 | [RTA_GATEWAY] = { .type = NLA_U32 }, | |
531 | [RTA_PRIORITY] = { .type = NLA_U32 }, | |
532 | [RTA_PREFSRC] = { .type = NLA_U32 }, | |
533 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
5176f91e | 534 | [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) }, |
4e902c57 | 535 | [RTA_FLOW] = { .type = NLA_U32 }, |
4e902c57 TG |
536 | }; |
537 | ||
4b5d47d4 | 538 | static int rtm_to_fib_config(struct net *net, struct sk_buff *skb, |
6a31d2a9 | 539 | struct nlmsghdr *nlh, struct fib_config *cfg) |
1da177e4 | 540 | { |
4e902c57 TG |
541 | struct nlattr *attr; |
542 | int err, remaining; | |
543 | struct rtmsg *rtm; | |
544 | ||
545 | err = nlmsg_validate(nlh, sizeof(*rtm), RTA_MAX, rtm_ipv4_policy); | |
546 | if (err < 0) | |
547 | goto errout; | |
548 | ||
549 | memset(cfg, 0, sizeof(*cfg)); | |
550 | ||
551 | rtm = nlmsg_data(nlh); | |
4e902c57 | 552 | cfg->fc_dst_len = rtm->rtm_dst_len; |
4e902c57 TG |
553 | cfg->fc_tos = rtm->rtm_tos; |
554 | cfg->fc_table = rtm->rtm_table; | |
555 | cfg->fc_protocol = rtm->rtm_protocol; | |
556 | cfg->fc_scope = rtm->rtm_scope; | |
557 | cfg->fc_type = rtm->rtm_type; | |
558 | cfg->fc_flags = rtm->rtm_flags; | |
559 | cfg->fc_nlflags = nlh->nlmsg_flags; | |
560 | ||
15e47304 | 561 | cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid; |
4e902c57 | 562 | cfg->fc_nlinfo.nlh = nlh; |
4b5d47d4 | 563 | cfg->fc_nlinfo.nl_net = net; |
4e902c57 | 564 | |
a0ee18b9 TG |
565 | if (cfg->fc_type > RTN_MAX) { |
566 | err = -EINVAL; | |
567 | goto errout; | |
568 | } | |
569 | ||
4e902c57 | 570 | nlmsg_for_each_attr(attr, nlh, sizeof(struct rtmsg), remaining) { |
8f4c1f9b | 571 | switch (nla_type(attr)) { |
4e902c57 | 572 | case RTA_DST: |
17fb2c64 | 573 | cfg->fc_dst = nla_get_be32(attr); |
4e902c57 | 574 | break; |
4e902c57 TG |
575 | case RTA_OIF: |
576 | cfg->fc_oif = nla_get_u32(attr); | |
577 | break; | |
578 | case RTA_GATEWAY: | |
17fb2c64 | 579 | cfg->fc_gw = nla_get_be32(attr); |
4e902c57 TG |
580 | break; |
581 | case RTA_PRIORITY: | |
582 | cfg->fc_priority = nla_get_u32(attr); | |
583 | break; | |
584 | case RTA_PREFSRC: | |
17fb2c64 | 585 | cfg->fc_prefsrc = nla_get_be32(attr); |
4e902c57 TG |
586 | break; |
587 | case RTA_METRICS: | |
588 | cfg->fc_mx = nla_data(attr); | |
589 | cfg->fc_mx_len = nla_len(attr); | |
590 | break; | |
591 | case RTA_MULTIPATH: | |
592 | cfg->fc_mp = nla_data(attr); | |
593 | cfg->fc_mp_len = nla_len(attr); | |
594 | break; | |
595 | case RTA_FLOW: | |
596 | cfg->fc_flow = nla_get_u32(attr); | |
597 | break; | |
4e902c57 TG |
598 | case RTA_TABLE: |
599 | cfg->fc_table = nla_get_u32(attr); | |
600 | break; | |
1da177e4 LT |
601 | } |
602 | } | |
4e902c57 | 603 | |
1da177e4 | 604 | return 0; |
4e902c57 TG |
605 | errout: |
606 | return err; | |
1da177e4 LT |
607 | } |
608 | ||
6ed2533e | 609 | static int inet_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) |
1da177e4 | 610 | { |
3b1e0a65 | 611 | struct net *net = sock_net(skb->sk); |
4e902c57 TG |
612 | struct fib_config cfg; |
613 | struct fib_table *tb; | |
614 | int err; | |
1da177e4 | 615 | |
dfc47ef8 EB |
616 | if (!capable(CAP_NET_ADMIN)) |
617 | return -EPERM; | |
618 | ||
4b5d47d4 | 619 | err = rtm_to_fib_config(net, skb, nlh, &cfg); |
4e902c57 TG |
620 | if (err < 0) |
621 | goto errout; | |
1da177e4 | 622 | |
8ad4942c | 623 | tb = fib_get_table(net, cfg.fc_table); |
4e902c57 TG |
624 | if (tb == NULL) { |
625 | err = -ESRCH; | |
626 | goto errout; | |
627 | } | |
628 | ||
16c6cf8b | 629 | err = fib_table_delete(tb, &cfg); |
4e902c57 TG |
630 | errout: |
631 | return err; | |
1da177e4 LT |
632 | } |
633 | ||
6ed2533e | 634 | static int inet_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) |
1da177e4 | 635 | { |
3b1e0a65 | 636 | struct net *net = sock_net(skb->sk); |
4e902c57 TG |
637 | struct fib_config cfg; |
638 | struct fib_table *tb; | |
639 | int err; | |
1da177e4 | 640 | |
dfc47ef8 EB |
641 | if (!capable(CAP_NET_ADMIN)) |
642 | return -EPERM; | |
643 | ||
4b5d47d4 | 644 | err = rtm_to_fib_config(net, skb, nlh, &cfg); |
4e902c57 TG |
645 | if (err < 0) |
646 | goto errout; | |
1da177e4 | 647 | |
226b0b4a | 648 | tb = fib_new_table(net, cfg.fc_table); |
4e902c57 TG |
649 | if (tb == NULL) { |
650 | err = -ENOBUFS; | |
651 | goto errout; | |
652 | } | |
653 | ||
16c6cf8b | 654 | err = fib_table_insert(tb, &cfg); |
4e902c57 TG |
655 | errout: |
656 | return err; | |
1da177e4 LT |
657 | } |
658 | ||
63f3444f | 659 | static int inet_dump_fib(struct sk_buff *skb, struct netlink_callback *cb) |
1da177e4 | 660 | { |
3b1e0a65 | 661 | struct net *net = sock_net(skb->sk); |
1af5a8c4 PM |
662 | unsigned int h, s_h; |
663 | unsigned int e = 0, s_e; | |
1da177e4 | 664 | struct fib_table *tb; |
1af5a8c4 | 665 | struct hlist_node *node; |
e4aef8ae | 666 | struct hlist_head *head; |
1af5a8c4 | 667 | int dumped = 0; |
1da177e4 | 668 | |
be403ea1 TG |
669 | if (nlmsg_len(cb->nlh) >= sizeof(struct rtmsg) && |
670 | ((struct rtmsg *) nlmsg_data(cb->nlh))->rtm_flags & RTM_F_CLONED) | |
1da177e4 LT |
671 | return ip_rt_dump(skb, cb); |
672 | ||
1af5a8c4 PM |
673 | s_h = cb->args[0]; |
674 | s_e = cb->args[1]; | |
675 | ||
676 | for (h = s_h; h < FIB_TABLE_HASHSZ; h++, s_e = 0) { | |
677 | e = 0; | |
e4aef8ae DL |
678 | head = &net->ipv4.fib_table_hash[h]; |
679 | hlist_for_each_entry(tb, node, head, tb_hlist) { | |
1af5a8c4 PM |
680 | if (e < s_e) |
681 | goto next; | |
682 | if (dumped) | |
683 | memset(&cb->args[2], 0, sizeof(cb->args) - | |
e905a9ed | 684 | 2 * sizeof(cb->args[0])); |
16c6cf8b | 685 | if (fib_table_dump(tb, skb, cb) < 0) |
1af5a8c4 PM |
686 | goto out; |
687 | dumped = 1; | |
688 | next: | |
689 | e++; | |
690 | } | |
1da177e4 | 691 | } |
1af5a8c4 PM |
692 | out: |
693 | cb->args[1] = e; | |
694 | cb->args[0] = h; | |
1da177e4 LT |
695 | |
696 | return skb->len; | |
697 | } | |
698 | ||
699 | /* Prepare and feed intra-kernel routing request. | |
6a31d2a9 ED |
700 | * Really, it should be netlink message, but :-( netlink |
701 | * can be not configured, so that we feed it directly | |
702 | * to fib engine. It is legal, because all events occur | |
703 | * only when netlink is already locked. | |
1da177e4 | 704 | */ |
81f7bf6c | 705 | static void fib_magic(int cmd, int type, __be32 dst, int dst_len, struct in_ifaddr *ifa) |
1da177e4 | 706 | { |
c346dca1 | 707 | struct net *net = dev_net(ifa->ifa_dev->dev); |
4e902c57 TG |
708 | struct fib_table *tb; |
709 | struct fib_config cfg = { | |
710 | .fc_protocol = RTPROT_KERNEL, | |
711 | .fc_type = type, | |
712 | .fc_dst = dst, | |
713 | .fc_dst_len = dst_len, | |
714 | .fc_prefsrc = ifa->ifa_local, | |
715 | .fc_oif = ifa->ifa_dev->dev->ifindex, | |
716 | .fc_nlflags = NLM_F_CREATE | NLM_F_APPEND, | |
4d1169c1 | 717 | .fc_nlinfo = { |
4b5d47d4 | 718 | .nl_net = net, |
4d1169c1 | 719 | }, |
4e902c57 | 720 | }; |
1da177e4 LT |
721 | |
722 | if (type == RTN_UNICAST) | |
4b5d47d4 | 723 | tb = fib_new_table(net, RT_TABLE_MAIN); |
1da177e4 | 724 | else |
4b5d47d4 | 725 | tb = fib_new_table(net, RT_TABLE_LOCAL); |
1da177e4 LT |
726 | |
727 | if (tb == NULL) | |
728 | return; | |
729 | ||
4e902c57 | 730 | cfg.fc_table = tb->tb_id; |
1da177e4 | 731 | |
4e902c57 TG |
732 | if (type != RTN_LOCAL) |
733 | cfg.fc_scope = RT_SCOPE_LINK; | |
734 | else | |
735 | cfg.fc_scope = RT_SCOPE_HOST; | |
1da177e4 LT |
736 | |
737 | if (cmd == RTM_NEWROUTE) | |
16c6cf8b | 738 | fib_table_insert(tb, &cfg); |
1da177e4 | 739 | else |
16c6cf8b | 740 | fib_table_delete(tb, &cfg); |
1da177e4 LT |
741 | } |
742 | ||
0ff60a45 | 743 | void fib_add_ifaddr(struct in_ifaddr *ifa) |
1da177e4 LT |
744 | { |
745 | struct in_device *in_dev = ifa->ifa_dev; | |
746 | struct net_device *dev = in_dev->dev; | |
747 | struct in_ifaddr *prim = ifa; | |
a144ea4b AV |
748 | __be32 mask = ifa->ifa_mask; |
749 | __be32 addr = ifa->ifa_local; | |
6a31d2a9 | 750 | __be32 prefix = ifa->ifa_address & mask; |
1da177e4 | 751 | |
6a31d2a9 | 752 | if (ifa->ifa_flags & IFA_F_SECONDARY) { |
1da177e4 LT |
753 | prim = inet_ifa_byprefix(in_dev, prefix, mask); |
754 | if (prim == NULL) { | |
058bd4d2 | 755 | pr_warn("%s: bug: prim == NULL\n", __func__); |
1da177e4 LT |
756 | return; |
757 | } | |
758 | } | |
759 | ||
760 | fib_magic(RTM_NEWROUTE, RTN_LOCAL, addr, 32, prim); | |
761 | ||
6a31d2a9 | 762 | if (!(dev->flags & IFF_UP)) |
1da177e4 LT |
763 | return; |
764 | ||
765 | /* Add broadcast address, if it is explicitly assigned. */ | |
a144ea4b | 766 | if (ifa->ifa_broadcast && ifa->ifa_broadcast != htonl(0xFFFFFFFF)) |
1da177e4 LT |
767 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim); |
768 | ||
6a31d2a9 | 769 | if (!ipv4_is_zeronet(prefix) && !(ifa->ifa_flags & IFA_F_SECONDARY) && |
1da177e4 | 770 | (prefix != addr || ifa->ifa_prefixlen < 32)) { |
6a31d2a9 ED |
771 | fib_magic(RTM_NEWROUTE, |
772 | dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST, | |
773 | prefix, ifa->ifa_prefixlen, prim); | |
1da177e4 LT |
774 | |
775 | /* Add network specific broadcasts, when it takes a sense */ | |
776 | if (ifa->ifa_prefixlen < 31) { | |
777 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix, 32, prim); | |
6a31d2a9 ED |
778 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix | ~mask, |
779 | 32, prim); | |
1da177e4 LT |
780 | } |
781 | } | |
782 | } | |
783 | ||
e6abbaa2 JA |
784 | /* Delete primary or secondary address. |
785 | * Optionally, on secondary address promotion consider the addresses | |
786 | * from subnet iprim as deleted, even if they are in device list. | |
787 | * In this case the secondary ifa can be in device list. | |
788 | */ | |
789 | void fib_del_ifaddr(struct in_ifaddr *ifa, struct in_ifaddr *iprim) | |
1da177e4 LT |
790 | { |
791 | struct in_device *in_dev = ifa->ifa_dev; | |
792 | struct net_device *dev = in_dev->dev; | |
793 | struct in_ifaddr *ifa1; | |
e6abbaa2 | 794 | struct in_ifaddr *prim = ifa, *prim1 = NULL; |
6a31d2a9 ED |
795 | __be32 brd = ifa->ifa_address | ~ifa->ifa_mask; |
796 | __be32 any = ifa->ifa_address & ifa->ifa_mask; | |
1da177e4 LT |
797 | #define LOCAL_OK 1 |
798 | #define BRD_OK 2 | |
799 | #define BRD0_OK 4 | |
800 | #define BRD1_OK 8 | |
95c96174 | 801 | unsigned int ok = 0; |
e6abbaa2 JA |
802 | int subnet = 0; /* Primary network */ |
803 | int gone = 1; /* Address is missing */ | |
804 | int same_prefsrc = 0; /* Another primary with same IP */ | |
1da177e4 | 805 | |
e6abbaa2 | 806 | if (ifa->ifa_flags & IFA_F_SECONDARY) { |
1da177e4 LT |
807 | prim = inet_ifa_byprefix(in_dev, any, ifa->ifa_mask); |
808 | if (prim == NULL) { | |
058bd4d2 | 809 | pr_warn("%s: bug: prim == NULL\n", __func__); |
1da177e4 LT |
810 | return; |
811 | } | |
e6abbaa2 | 812 | if (iprim && iprim != prim) { |
058bd4d2 | 813 | pr_warn("%s: bug: iprim != prim\n", __func__); |
e6abbaa2 JA |
814 | return; |
815 | } | |
816 | } else if (!ipv4_is_zeronet(any) && | |
817 | (any != ifa->ifa_local || ifa->ifa_prefixlen < 32)) { | |
818 | fib_magic(RTM_DELROUTE, | |
819 | dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST, | |
820 | any, ifa->ifa_prefixlen, prim); | |
821 | subnet = 1; | |
1da177e4 LT |
822 | } |
823 | ||
824 | /* Deletion is more complicated than add. | |
6a31d2a9 ED |
825 | * We should take care of not to delete too much :-) |
826 | * | |
827 | * Scan address list to be sure that addresses are really gone. | |
1da177e4 LT |
828 | */ |
829 | ||
830 | for (ifa1 = in_dev->ifa_list; ifa1; ifa1 = ifa1->ifa_next) { | |
e6abbaa2 JA |
831 | if (ifa1 == ifa) { |
832 | /* promotion, keep the IP */ | |
833 | gone = 0; | |
834 | continue; | |
835 | } | |
836 | /* Ignore IFAs from our subnet */ | |
837 | if (iprim && ifa1->ifa_mask == iprim->ifa_mask && | |
838 | inet_ifa_match(ifa1->ifa_address, iprim)) | |
839 | continue; | |
840 | ||
841 | /* Ignore ifa1 if it uses different primary IP (prefsrc) */ | |
842 | if (ifa1->ifa_flags & IFA_F_SECONDARY) { | |
843 | /* Another address from our subnet? */ | |
844 | if (ifa1->ifa_mask == prim->ifa_mask && | |
845 | inet_ifa_match(ifa1->ifa_address, prim)) | |
846 | prim1 = prim; | |
847 | else { | |
848 | /* We reached the secondaries, so | |
849 | * same_prefsrc should be determined. | |
850 | */ | |
851 | if (!same_prefsrc) | |
852 | continue; | |
853 | /* Search new prim1 if ifa1 is not | |
854 | * using the current prim1 | |
855 | */ | |
856 | if (!prim1 || | |
857 | ifa1->ifa_mask != prim1->ifa_mask || | |
858 | !inet_ifa_match(ifa1->ifa_address, prim1)) | |
859 | prim1 = inet_ifa_byprefix(in_dev, | |
860 | ifa1->ifa_address, | |
861 | ifa1->ifa_mask); | |
862 | if (!prim1) | |
863 | continue; | |
864 | if (prim1->ifa_local != prim->ifa_local) | |
865 | continue; | |
866 | } | |
867 | } else { | |
868 | if (prim->ifa_local != ifa1->ifa_local) | |
869 | continue; | |
870 | prim1 = ifa1; | |
871 | if (prim != prim1) | |
872 | same_prefsrc = 1; | |
873 | } | |
1da177e4 LT |
874 | if (ifa->ifa_local == ifa1->ifa_local) |
875 | ok |= LOCAL_OK; | |
876 | if (ifa->ifa_broadcast == ifa1->ifa_broadcast) | |
877 | ok |= BRD_OK; | |
878 | if (brd == ifa1->ifa_broadcast) | |
879 | ok |= BRD1_OK; | |
880 | if (any == ifa1->ifa_broadcast) | |
881 | ok |= BRD0_OK; | |
e6abbaa2 JA |
882 | /* primary has network specific broadcasts */ |
883 | if (prim1 == ifa1 && ifa1->ifa_prefixlen < 31) { | |
884 | __be32 brd1 = ifa1->ifa_address | ~ifa1->ifa_mask; | |
885 | __be32 any1 = ifa1->ifa_address & ifa1->ifa_mask; | |
886 | ||
887 | if (!ipv4_is_zeronet(any1)) { | |
888 | if (ifa->ifa_broadcast == brd1 || | |
889 | ifa->ifa_broadcast == any1) | |
890 | ok |= BRD_OK; | |
891 | if (brd == brd1 || brd == any1) | |
892 | ok |= BRD1_OK; | |
893 | if (any == brd1 || any == any1) | |
894 | ok |= BRD0_OK; | |
895 | } | |
896 | } | |
1da177e4 LT |
897 | } |
898 | ||
6a31d2a9 | 899 | if (!(ok & BRD_OK)) |
1da177e4 | 900 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim); |
e6abbaa2 JA |
901 | if (subnet && ifa->ifa_prefixlen < 31) { |
902 | if (!(ok & BRD1_OK)) | |
903 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, brd, 32, prim); | |
904 | if (!(ok & BRD0_OK)) | |
905 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, any, 32, prim); | |
906 | } | |
6a31d2a9 | 907 | if (!(ok & LOCAL_OK)) { |
1da177e4 LT |
908 | fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 32, prim); |
909 | ||
910 | /* Check, that this local address finally disappeared. */ | |
e6abbaa2 JA |
911 | if (gone && |
912 | inet_addr_type(dev_net(dev), ifa->ifa_local) != RTN_LOCAL) { | |
1da177e4 | 913 | /* And the last, but not the least thing. |
6a31d2a9 ED |
914 | * We must flush stray FIB entries. |
915 | * | |
916 | * First of all, we scan fib_info list searching | |
917 | * for stray nexthop entries, then ignite fib_flush. | |
918 | */ | |
c346dca1 YH |
919 | if (fib_sync_down_addr(dev_net(dev), ifa->ifa_local)) |
920 | fib_flush(dev_net(dev)); | |
1da177e4 LT |
921 | } |
922 | } | |
923 | #undef LOCAL_OK | |
924 | #undef BRD_OK | |
925 | #undef BRD0_OK | |
926 | #undef BRD1_OK | |
927 | } | |
928 | ||
6a31d2a9 | 929 | static void nl_fib_lookup(struct fib_result_nl *frn, struct fib_table *tb) |
246955fe | 930 | { |
e905a9ed | 931 | |
246955fe | 932 | struct fib_result res; |
9ade2286 DM |
933 | struct flowi4 fl4 = { |
934 | .flowi4_mark = frn->fl_mark, | |
935 | .daddr = frn->fl_addr, | |
936 | .flowi4_tos = frn->fl_tos, | |
937 | .flowi4_scope = frn->fl_scope, | |
6a31d2a9 | 938 | }; |
1194ed0a AK |
939 | |
940 | frn->err = -ENOENT; | |
246955fe RO |
941 | if (tb) { |
942 | local_bh_disable(); | |
943 | ||
944 | frn->tb_id = tb->tb_id; | |
ebc0ffae | 945 | rcu_read_lock(); |
9ade2286 | 946 | frn->err = fib_table_lookup(tb, &fl4, &res, FIB_LOOKUP_NOREF); |
246955fe RO |
947 | |
948 | if (!frn->err) { | |
949 | frn->prefixlen = res.prefixlen; | |
950 | frn->nh_sel = res.nh_sel; | |
951 | frn->type = res.type; | |
952 | frn->scope = res.scope; | |
953 | } | |
ebc0ffae | 954 | rcu_read_unlock(); |
246955fe RO |
955 | local_bh_enable(); |
956 | } | |
957 | } | |
958 | ||
28f7b036 | 959 | static void nl_fib_input(struct sk_buff *skb) |
246955fe | 960 | { |
6bd48fcf | 961 | struct net *net; |
246955fe | 962 | struct fib_result_nl *frn; |
28f7b036 | 963 | struct nlmsghdr *nlh; |
246955fe | 964 | struct fib_table *tb; |
15e47304 | 965 | u32 portid; |
1194ed0a | 966 | |
3b1e0a65 | 967 | net = sock_net(skb->sk); |
b529ccf2 | 968 | nlh = nlmsg_hdr(skb); |
ea86575e | 969 | if (skb->len < NLMSG_SPACE(0) || skb->len < nlh->nlmsg_len || |
d883a036 | 970 | nlh->nlmsg_len < NLMSG_LENGTH(sizeof(*frn))) |
ea86575e | 971 | return; |
d883a036 DL |
972 | |
973 | skb = skb_clone(skb, GFP_KERNEL); | |
974 | if (skb == NULL) | |
975 | return; | |
976 | nlh = nlmsg_hdr(skb); | |
e905a9ed | 977 | |
246955fe | 978 | frn = (struct fib_result_nl *) NLMSG_DATA(nlh); |
6bd48fcf | 979 | tb = fib_get_table(net, frn->tb_id_in); |
246955fe RO |
980 | |
981 | nl_fib_lookup(frn, tb); | |
e905a9ed | 982 | |
15e47304 EB |
983 | portid = NETLINK_CB(skb).portid; /* pid of sending process */ |
984 | NETLINK_CB(skb).portid = 0; /* from kernel */ | |
ac6d439d | 985 | NETLINK_CB(skb).dst_group = 0; /* unicast */ |
15e47304 | 986 | netlink_unicast(net->ipv4.fibnl, skb, portid, MSG_DONTWAIT); |
e905a9ed | 987 | } |
246955fe | 988 | |
2c8c1e72 | 989 | static int __net_init nl_fib_lookup_init(struct net *net) |
246955fe | 990 | { |
6bd48fcf | 991 | struct sock *sk; |
a31f2d17 PNA |
992 | struct netlink_kernel_cfg cfg = { |
993 | .input = nl_fib_input, | |
994 | }; | |
995 | ||
9f00d977 | 996 | sk = netlink_kernel_create(net, NETLINK_FIB_LOOKUP, &cfg); |
6bd48fcf | 997 | if (sk == NULL) |
7b1a74fd | 998 | return -EAFNOSUPPORT; |
6bd48fcf | 999 | net->ipv4.fibnl = sk; |
7b1a74fd DL |
1000 | return 0; |
1001 | } | |
1002 | ||
1003 | static void nl_fib_lookup_exit(struct net *net) | |
1004 | { | |
b7c6ba6e | 1005 | netlink_kernel_release(net->ipv4.fibnl); |
775516bf | 1006 | net->ipv4.fibnl = NULL; |
246955fe RO |
1007 | } |
1008 | ||
4ccfe6d4 | 1009 | static void fib_disable_ip(struct net_device *dev, int force) |
1da177e4 | 1010 | { |
85326fa5 | 1011 | if (fib_sync_down_dev(dev, force)) |
c346dca1 | 1012 | fib_flush(dev_net(dev)); |
4ccfe6d4 | 1013 | rt_cache_flush(dev_net(dev)); |
1da177e4 LT |
1014 | arp_ifdown(dev); |
1015 | } | |
1016 | ||
1017 | static int fib_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1018 | { | |
6ed2533e | 1019 | struct in_ifaddr *ifa = (struct in_ifaddr *)ptr; |
76e6ebfb | 1020 | struct net_device *dev = ifa->ifa_dev->dev; |
436c3b66 | 1021 | struct net *net = dev_net(dev); |
1da177e4 LT |
1022 | |
1023 | switch (event) { | |
1024 | case NETDEV_UP: | |
1025 | fib_add_ifaddr(ifa); | |
1026 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
76e6ebfb | 1027 | fib_sync_up(dev); |
1da177e4 | 1028 | #endif |
436c3b66 | 1029 | atomic_inc(&net->ipv4.dev_addr_genid); |
4ccfe6d4 | 1030 | rt_cache_flush(dev_net(dev)); |
1da177e4 LT |
1031 | break; |
1032 | case NETDEV_DOWN: | |
e6abbaa2 | 1033 | fib_del_ifaddr(ifa, NULL); |
436c3b66 | 1034 | atomic_inc(&net->ipv4.dev_addr_genid); |
9fcc2e8a | 1035 | if (ifa->ifa_dev->ifa_list == NULL) { |
1da177e4 | 1036 | /* Last address was deleted from this interface. |
6a31d2a9 | 1037 | * Disable IP. |
1da177e4 | 1038 | */ |
4ccfe6d4 | 1039 | fib_disable_ip(dev, 1); |
1da177e4 | 1040 | } else { |
4ccfe6d4 | 1041 | rt_cache_flush(dev_net(dev)); |
1da177e4 LT |
1042 | } |
1043 | break; | |
1044 | } | |
1045 | return NOTIFY_DONE; | |
1046 | } | |
1047 | ||
1048 | static int fib_netdev_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1049 | { | |
1050 | struct net_device *dev = ptr; | |
0115e8e3 | 1051 | struct in_device *in_dev; |
436c3b66 | 1052 | struct net *net = dev_net(dev); |
1da177e4 LT |
1053 | |
1054 | if (event == NETDEV_UNREGISTER) { | |
4ccfe6d4 | 1055 | fib_disable_ip(dev, 2); |
caacf05e | 1056 | rt_flush_dev(dev); |
1da177e4 LT |
1057 | return NOTIFY_DONE; |
1058 | } | |
1059 | ||
0115e8e3 ED |
1060 | in_dev = __in_dev_get_rtnl(dev); |
1061 | ||
1da177e4 LT |
1062 | switch (event) { |
1063 | case NETDEV_UP: | |
1064 | for_ifa(in_dev) { | |
1065 | fib_add_ifaddr(ifa); | |
1066 | } endfor_ifa(in_dev); | |
1067 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
1068 | fib_sync_up(dev); | |
1069 | #endif | |
436c3b66 | 1070 | atomic_inc(&net->ipv4.dev_addr_genid); |
4ccfe6d4 | 1071 | rt_cache_flush(net); |
1da177e4 LT |
1072 | break; |
1073 | case NETDEV_DOWN: | |
4ccfe6d4 | 1074 | fib_disable_ip(dev, 0); |
1da177e4 LT |
1075 | break; |
1076 | case NETDEV_CHANGEMTU: | |
1077 | case NETDEV_CHANGE: | |
4ccfe6d4 | 1078 | rt_cache_flush(net); |
1da177e4 LT |
1079 | break; |
1080 | } | |
1081 | return NOTIFY_DONE; | |
1082 | } | |
1083 | ||
1084 | static struct notifier_block fib_inetaddr_notifier = { | |
6ed2533e | 1085 | .notifier_call = fib_inetaddr_event, |
1da177e4 LT |
1086 | }; |
1087 | ||
1088 | static struct notifier_block fib_netdev_notifier = { | |
6ed2533e | 1089 | .notifier_call = fib_netdev_event, |
1da177e4 LT |
1090 | }; |
1091 | ||
7b1a74fd | 1092 | static int __net_init ip_fib_net_init(struct net *net) |
1da177e4 | 1093 | { |
dce5cbee | 1094 | int err; |
10da66f7 ED |
1095 | size_t size = sizeof(struct hlist_head) * FIB_TABLE_HASHSZ; |
1096 | ||
1097 | /* Avoid false sharing : Use at least a full cache line */ | |
1098 | size = max_t(size_t, size, L1_CACHE_BYTES); | |
1af5a8c4 | 1099 | |
10da66f7 | 1100 | net->ipv4.fib_table_hash = kzalloc(size, GFP_KERNEL); |
e4aef8ae DL |
1101 | if (net->ipv4.fib_table_hash == NULL) |
1102 | return -ENOMEM; | |
1103 | ||
dce5cbee DL |
1104 | err = fib4_rules_init(net); |
1105 | if (err < 0) | |
1106 | goto fail; | |
1107 | return 0; | |
1108 | ||
1109 | fail: | |
1110 | kfree(net->ipv4.fib_table_hash); | |
1111 | return err; | |
7b1a74fd | 1112 | } |
1da177e4 | 1113 | |
2c8c1e72 | 1114 | static void ip_fib_net_exit(struct net *net) |
7b1a74fd DL |
1115 | { |
1116 | unsigned int i; | |
1117 | ||
1118 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
1119 | fib4_rules_exit(net); | |
1120 | #endif | |
1121 | ||
e2666f84 | 1122 | rtnl_lock(); |
7b1a74fd DL |
1123 | for (i = 0; i < FIB_TABLE_HASHSZ; i++) { |
1124 | struct fib_table *tb; | |
1125 | struct hlist_head *head; | |
1126 | struct hlist_node *node, *tmp; | |
63f3444f | 1127 | |
e4aef8ae | 1128 | head = &net->ipv4.fib_table_hash[i]; |
7b1a74fd DL |
1129 | hlist_for_each_entry_safe(tb, node, tmp, head, tb_hlist) { |
1130 | hlist_del(node); | |
16c6cf8b | 1131 | fib_table_flush(tb); |
4aa2c466 | 1132 | fib_free_table(tb); |
7b1a74fd DL |
1133 | } |
1134 | } | |
e2666f84 | 1135 | rtnl_unlock(); |
e4aef8ae | 1136 | kfree(net->ipv4.fib_table_hash); |
7b1a74fd DL |
1137 | } |
1138 | ||
1139 | static int __net_init fib_net_init(struct net *net) | |
1140 | { | |
1141 | int error; | |
1142 | ||
f4530fa5 DM |
1143 | #ifdef CONFIG_IP_ROUTE_CLASSID |
1144 | net->ipv4.fib_num_tclassid_users = 0; | |
1145 | #endif | |
7b1a74fd DL |
1146 | error = ip_fib_net_init(net); |
1147 | if (error < 0) | |
1148 | goto out; | |
1149 | error = nl_fib_lookup_init(net); | |
1150 | if (error < 0) | |
1151 | goto out_nlfl; | |
1152 | error = fib_proc_init(net); | |
1153 | if (error < 0) | |
1154 | goto out_proc; | |
1155 | out: | |
1156 | return error; | |
1157 | ||
1158 | out_proc: | |
1159 | nl_fib_lookup_exit(net); | |
1160 | out_nlfl: | |
1161 | ip_fib_net_exit(net); | |
1162 | goto out; | |
1163 | } | |
1164 | ||
1165 | static void __net_exit fib_net_exit(struct net *net) | |
1166 | { | |
1167 | fib_proc_exit(net); | |
1168 | nl_fib_lookup_exit(net); | |
1169 | ip_fib_net_exit(net); | |
1170 | } | |
1171 | ||
1172 | static struct pernet_operations fib_net_ops = { | |
1173 | .init = fib_net_init, | |
1174 | .exit = fib_net_exit, | |
1175 | }; | |
1176 | ||
1177 | void __init ip_fib_init(void) | |
1178 | { | |
c7ac8679 GR |
1179 | rtnl_register(PF_INET, RTM_NEWROUTE, inet_rtm_newroute, NULL, NULL); |
1180 | rtnl_register(PF_INET, RTM_DELROUTE, inet_rtm_delroute, NULL, NULL); | |
1181 | rtnl_register(PF_INET, RTM_GETROUTE, NULL, inet_dump_fib, NULL); | |
7b1a74fd DL |
1182 | |
1183 | register_pernet_subsys(&fib_net_ops); | |
1184 | register_netdevice_notifier(&fib_netdev_notifier); | |
1185 | register_inetaddr_notifier(&fib_inetaddr_notifier); | |
7f9b8052 | 1186 | |
5348ba85 | 1187 | fib_trie_init(); |
1da177e4 | 1188 | } |