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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> | |
18 | #include <asm/system.h> | |
19 | #include <linux/bitops.h> | |
4fc268d2 | 20 | #include <linux/capability.h> |
1da177e4 LT |
21 | #include <linux/types.h> |
22 | #include <linux/kernel.h> | |
1da177e4 LT |
23 | #include <linux/mm.h> |
24 | #include <linux/string.h> | |
25 | #include <linux/socket.h> | |
26 | #include <linux/sockios.h> | |
27 | #include <linux/errno.h> | |
28 | #include <linux/in.h> | |
29 | #include <linux/inet.h> | |
14c85021 | 30 | #include <linux/inetdevice.h> |
1da177e4 | 31 | #include <linux/netdevice.h> |
1823730f | 32 | #include <linux/if_addr.h> |
1da177e4 LT |
33 | #include <linux/if_arp.h> |
34 | #include <linux/skbuff.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; | |
1af5a8c4 | 89 | h = id & (FIB_TABLE_HASHSZ - 1); |
e4aef8ae | 90 | hlist_add_head_rcu(&tb->tb_hlist, &net->ipv4.fib_table_hash[h]); |
1da177e4 LT |
91 | return tb; |
92 | } | |
93 | ||
8ad4942c | 94 | struct fib_table *fib_get_table(struct net *net, u32 id) |
1af5a8c4 PM |
95 | { |
96 | struct fib_table *tb; | |
97 | struct hlist_node *node; | |
e4aef8ae | 98 | struct hlist_head *head; |
1af5a8c4 | 99 | unsigned int h; |
1da177e4 | 100 | |
1af5a8c4 PM |
101 | if (id == 0) |
102 | id = RT_TABLE_MAIN; | |
103 | h = id & (FIB_TABLE_HASHSZ - 1); | |
e4aef8ae | 104 | |
1af5a8c4 | 105 | rcu_read_lock(); |
e4aef8ae DL |
106 | head = &net->ipv4.fib_table_hash[h]; |
107 | hlist_for_each_entry_rcu(tb, node, head, tb_hlist) { | |
1af5a8c4 PM |
108 | if (tb->tb_id == id) { |
109 | rcu_read_unlock(); | |
110 | return tb; | |
111 | } | |
112 | } | |
113 | rcu_read_unlock(); | |
114 | return NULL; | |
115 | } | |
1da177e4 LT |
116 | #endif /* CONFIG_IP_MULTIPLE_TABLES */ |
117 | ||
e4aef8ae | 118 | static void fib_flush(struct net *net) |
1da177e4 LT |
119 | { |
120 | int flushed = 0; | |
1da177e4 | 121 | struct fib_table *tb; |
1af5a8c4 | 122 | struct hlist_node *node; |
e4aef8ae | 123 | struct hlist_head *head; |
1af5a8c4 | 124 | unsigned int h; |
1da177e4 | 125 | |
1af5a8c4 | 126 | for (h = 0; h < FIB_TABLE_HASHSZ; h++) { |
e4aef8ae DL |
127 | head = &net->ipv4.fib_table_hash[h]; |
128 | hlist_for_each_entry(tb, node, head, tb_hlist) | |
16c6cf8b | 129 | flushed += fib_table_flush(tb); |
1da177e4 | 130 | } |
1da177e4 LT |
131 | |
132 | if (flushed) | |
76e6ebfb | 133 | rt_cache_flush(net, -1); |
1da177e4 LT |
134 | } |
135 | ||
05538116 LAT |
136 | /* |
137 | * Find address type as if only "dev" was present in the system. If | |
138 | * on_dev is NULL then all interfaces are taken into consideration. | |
139 | */ | |
6b175b26 EB |
140 | static inline unsigned __inet_dev_addr_type(struct net *net, |
141 | const struct net_device *dev, | |
05538116 | 142 | __be32 addr) |
1da177e4 | 143 | { |
9ade2286 | 144 | struct flowi4 fl4 = { .daddr = addr }; |
1da177e4 LT |
145 | struct fib_result res; |
146 | unsigned ret = RTN_BROADCAST; | |
03cf786c | 147 | struct fib_table *local_table; |
1da177e4 | 148 | |
1e637c74 | 149 | if (ipv4_is_zeronet(addr) || ipv4_is_lbcast(addr)) |
1da177e4 | 150 | return RTN_BROADCAST; |
f97c1e0c | 151 | if (ipv4_is_multicast(addr)) |
1da177e4 LT |
152 | return RTN_MULTICAST; |
153 | ||
154 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
155 | res.r = NULL; | |
156 | #endif | |
e905a9ed | 157 | |
6b175b26 | 158 | local_table = fib_get_table(net, RT_TABLE_LOCAL); |
03cf786c | 159 | if (local_table) { |
1da177e4 | 160 | ret = RTN_UNICAST; |
ebc0ffae | 161 | rcu_read_lock(); |
9ade2286 | 162 | if (!fib_table_lookup(local_table, &fl4, &res, FIB_LOOKUP_NOREF)) { |
05538116 LAT |
163 | if (!dev || dev == res.fi->fib_dev) |
164 | ret = res.type; | |
1da177e4 | 165 | } |
ebc0ffae | 166 | rcu_read_unlock(); |
1da177e4 LT |
167 | } |
168 | return ret; | |
169 | } | |
170 | ||
6b175b26 | 171 | unsigned int inet_addr_type(struct net *net, __be32 addr) |
05538116 | 172 | { |
6b175b26 | 173 | return __inet_dev_addr_type(net, NULL, addr); |
05538116 | 174 | } |
4bc2f18b | 175 | EXPORT_SYMBOL(inet_addr_type); |
05538116 | 176 | |
6b175b26 EB |
177 | unsigned int inet_dev_addr_type(struct net *net, const struct net_device *dev, |
178 | __be32 addr) | |
05538116 | 179 | { |
6a31d2a9 | 180 | return __inet_dev_addr_type(net, dev, addr); |
05538116 | 181 | } |
4bc2f18b | 182 | EXPORT_SYMBOL(inet_dev_addr_type); |
05538116 | 183 | |
1da177e4 | 184 | /* Given (packet source, input interface) and optional (dst, oif, tos): |
6a31d2a9 ED |
185 | * - (main) check, that source is valid i.e. not broadcast or our local |
186 | * address. | |
187 | * - figure out what "logical" interface this packet arrived | |
188 | * and calculate "specific destination" address. | |
189 | * - check, that packet arrived from expected physical interface. | |
ebc0ffae | 190 | * called with rcu_read_lock() |
1da177e4 | 191 | */ |
5c04c819 MS |
192 | int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst, u8 tos, |
193 | int oif, struct net_device *dev, __be32 *spec_dst, | |
194 | u32 *itag) | |
1da177e4 LT |
195 | { |
196 | struct in_device *in_dev; | |
9ade2286 | 197 | struct flowi4 fl4; |
1da177e4 | 198 | struct fib_result res; |
8153a10c | 199 | int no_addr, rpf, accept_local; |
6f86b325 | 200 | bool dev_match; |
1da177e4 | 201 | int ret; |
5b707aaa | 202 | struct net *net; |
1da177e4 | 203 | |
9ade2286 DM |
204 | fl4.flowi4_oif = 0; |
205 | fl4.flowi4_iif = oif; | |
9ade2286 DM |
206 | fl4.daddr = src; |
207 | fl4.saddr = dst; | |
208 | fl4.flowi4_tos = tos; | |
209 | fl4.flowi4_scope = RT_SCOPE_UNIVERSE; | |
cc7e17ea | 210 | |
8153a10c | 211 | no_addr = rpf = accept_local = 0; |
e5ed6399 | 212 | in_dev = __in_dev_get_rcu(dev); |
1da177e4 LT |
213 | if (in_dev) { |
214 | no_addr = in_dev->ifa_list == NULL; | |
990078af MS |
215 | |
216 | /* Ignore rp_filter for packets protected by IPsec. */ | |
217 | rpf = secpath_exists(skb) ? 0 : IN_DEV_RPFILTER(in_dev); | |
218 | ||
8153a10c | 219 | accept_local = IN_DEV_ACCEPT_LOCAL(in_dev); |
5c04c819 | 220 | fl4.flowi4_mark = IN_DEV_SRC_VMARK(in_dev) ? skb->mark : 0; |
1da177e4 | 221 | } |
1da177e4 LT |
222 | |
223 | if (in_dev == NULL) | |
224 | goto e_inval; | |
225 | ||
c346dca1 | 226 | net = dev_net(dev); |
9ade2286 | 227 | if (fib_lookup(net, &fl4, &res)) |
1da177e4 | 228 | goto last_resort; |
8153a10c PM |
229 | if (res.type != RTN_UNICAST) { |
230 | if (res.type != RTN_LOCAL || !accept_local) | |
ebc0ffae | 231 | goto e_inval; |
8153a10c | 232 | } |
436c3b66 | 233 | *spec_dst = FIB_RES_PREFSRC(net, res); |
1da177e4 | 234 | fib_combine_itag(itag, &res); |
6f86b325 DM |
235 | dev_match = false; |
236 | ||
1da177e4 | 237 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
6f86b325 DM |
238 | for (ret = 0; ret < res.fi->fib_nhs; ret++) { |
239 | struct fib_nh *nh = &res.fi->fib_nh[ret]; | |
240 | ||
241 | if (nh->nh_dev == dev) { | |
242 | dev_match = true; | |
243 | break; | |
244 | } | |
245 | } | |
1da177e4 LT |
246 | #else |
247 | if (FIB_RES_DEV(res) == dev) | |
6f86b325 | 248 | dev_match = true; |
1da177e4 | 249 | #endif |
6f86b325 | 250 | if (dev_match) { |
1da177e4 | 251 | ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST; |
1da177e4 LT |
252 | return ret; |
253 | } | |
1da177e4 LT |
254 | if (no_addr) |
255 | goto last_resort; | |
c1cf8422 | 256 | if (rpf == 1) |
b5f7e755 | 257 | goto e_rpf; |
9ade2286 | 258 | fl4.flowi4_oif = dev->ifindex; |
1da177e4 LT |
259 | |
260 | ret = 0; | |
9ade2286 | 261 | if (fib_lookup(net, &fl4, &res) == 0) { |
1da177e4 | 262 | if (res.type == RTN_UNICAST) { |
436c3b66 | 263 | *spec_dst = FIB_RES_PREFSRC(net, res); |
1da177e4 LT |
264 | ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST; |
265 | } | |
1da177e4 LT |
266 | } |
267 | return ret; | |
268 | ||
269 | last_resort: | |
270 | if (rpf) | |
b5f7e755 | 271 | goto e_rpf; |
1da177e4 LT |
272 | *spec_dst = inet_select_addr(dev, 0, RT_SCOPE_UNIVERSE); |
273 | *itag = 0; | |
274 | return 0; | |
275 | ||
1da177e4 LT |
276 | e_inval: |
277 | return -EINVAL; | |
b5f7e755 ED |
278 | e_rpf: |
279 | return -EXDEV; | |
1da177e4 LT |
280 | } |
281 | ||
81f7bf6c | 282 | static inline __be32 sk_extract_addr(struct sockaddr *addr) |
4e902c57 TG |
283 | { |
284 | return ((struct sockaddr_in *) addr)->sin_addr.s_addr; | |
285 | } | |
286 | ||
287 | static int put_rtax(struct nlattr *mx, int len, int type, u32 value) | |
288 | { | |
289 | struct nlattr *nla; | |
290 | ||
291 | nla = (struct nlattr *) ((char *) mx + len); | |
292 | nla->nla_type = type; | |
293 | nla->nla_len = nla_attr_size(4); | |
294 | *(u32 *) nla_data(nla) = value; | |
295 | ||
296 | return len + nla_total_size(4); | |
297 | } | |
298 | ||
4b5d47d4 | 299 | static int rtentry_to_fib_config(struct net *net, int cmd, struct rtentry *rt, |
4e902c57 TG |
300 | struct fib_config *cfg) |
301 | { | |
6d85c10a | 302 | __be32 addr; |
4e902c57 TG |
303 | int plen; |
304 | ||
305 | memset(cfg, 0, sizeof(*cfg)); | |
4b5d47d4 | 306 | cfg->fc_nlinfo.nl_net = net; |
4e902c57 TG |
307 | |
308 | if (rt->rt_dst.sa_family != AF_INET) | |
309 | return -EAFNOSUPPORT; | |
310 | ||
311 | /* | |
312 | * Check mask for validity: | |
313 | * a) it must be contiguous. | |
314 | * b) destination must have all host bits clear. | |
315 | * c) if application forgot to set correct family (AF_INET), | |
316 | * reject request unless it is absolutely clear i.e. | |
317 | * both family and mask are zero. | |
318 | */ | |
319 | plen = 32; | |
320 | addr = sk_extract_addr(&rt->rt_dst); | |
321 | if (!(rt->rt_flags & RTF_HOST)) { | |
81f7bf6c | 322 | __be32 mask = sk_extract_addr(&rt->rt_genmask); |
4e902c57 TG |
323 | |
324 | if (rt->rt_genmask.sa_family != AF_INET) { | |
325 | if (mask || rt->rt_genmask.sa_family) | |
326 | return -EAFNOSUPPORT; | |
327 | } | |
328 | ||
329 | if (bad_mask(mask, addr)) | |
330 | return -EINVAL; | |
331 | ||
332 | plen = inet_mask_len(mask); | |
333 | } | |
334 | ||
335 | cfg->fc_dst_len = plen; | |
336 | cfg->fc_dst = addr; | |
337 | ||
338 | if (cmd != SIOCDELRT) { | |
339 | cfg->fc_nlflags = NLM_F_CREATE; | |
340 | cfg->fc_protocol = RTPROT_BOOT; | |
341 | } | |
342 | ||
343 | if (rt->rt_metric) | |
344 | cfg->fc_priority = rt->rt_metric - 1; | |
345 | ||
346 | if (rt->rt_flags & RTF_REJECT) { | |
347 | cfg->fc_scope = RT_SCOPE_HOST; | |
348 | cfg->fc_type = RTN_UNREACHABLE; | |
349 | return 0; | |
350 | } | |
351 | ||
352 | cfg->fc_scope = RT_SCOPE_NOWHERE; | |
353 | cfg->fc_type = RTN_UNICAST; | |
354 | ||
355 | if (rt->rt_dev) { | |
356 | char *colon; | |
357 | struct net_device *dev; | |
358 | char devname[IFNAMSIZ]; | |
359 | ||
360 | if (copy_from_user(devname, rt->rt_dev, IFNAMSIZ-1)) | |
361 | return -EFAULT; | |
362 | ||
363 | devname[IFNAMSIZ-1] = 0; | |
364 | colon = strchr(devname, ':'); | |
365 | if (colon) | |
366 | *colon = 0; | |
4b5d47d4 | 367 | dev = __dev_get_by_name(net, devname); |
4e902c57 TG |
368 | if (!dev) |
369 | return -ENODEV; | |
370 | cfg->fc_oif = dev->ifindex; | |
371 | if (colon) { | |
372 | struct in_ifaddr *ifa; | |
373 | struct in_device *in_dev = __in_dev_get_rtnl(dev); | |
374 | if (!in_dev) | |
375 | return -ENODEV; | |
376 | *colon = ':'; | |
377 | for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) | |
378 | if (strcmp(ifa->ifa_label, devname) == 0) | |
379 | break; | |
380 | if (ifa == NULL) | |
381 | return -ENODEV; | |
382 | cfg->fc_prefsrc = ifa->ifa_local; | |
383 | } | |
384 | } | |
385 | ||
386 | addr = sk_extract_addr(&rt->rt_gateway); | |
387 | if (rt->rt_gateway.sa_family == AF_INET && addr) { | |
388 | cfg->fc_gw = addr; | |
389 | if (rt->rt_flags & RTF_GATEWAY && | |
4b5d47d4 | 390 | inet_addr_type(net, addr) == RTN_UNICAST) |
4e902c57 TG |
391 | cfg->fc_scope = RT_SCOPE_UNIVERSE; |
392 | } | |
393 | ||
394 | if (cmd == SIOCDELRT) | |
395 | return 0; | |
396 | ||
397 | if (rt->rt_flags & RTF_GATEWAY && !cfg->fc_gw) | |
398 | return -EINVAL; | |
399 | ||
400 | if (cfg->fc_scope == RT_SCOPE_NOWHERE) | |
401 | cfg->fc_scope = RT_SCOPE_LINK; | |
402 | ||
403 | if (rt->rt_flags & (RTF_MTU | RTF_WINDOW | RTF_IRTT)) { | |
404 | struct nlattr *mx; | |
405 | int len = 0; | |
406 | ||
407 | mx = kzalloc(3 * nla_total_size(4), GFP_KERNEL); | |
e905a9ed | 408 | if (mx == NULL) |
4e902c57 TG |
409 | return -ENOMEM; |
410 | ||
411 | if (rt->rt_flags & RTF_MTU) | |
412 | len = put_rtax(mx, len, RTAX_ADVMSS, rt->rt_mtu - 40); | |
413 | ||
414 | if (rt->rt_flags & RTF_WINDOW) | |
415 | len = put_rtax(mx, len, RTAX_WINDOW, rt->rt_window); | |
416 | ||
417 | if (rt->rt_flags & RTF_IRTT) | |
418 | len = put_rtax(mx, len, RTAX_RTT, rt->rt_irtt << 3); | |
419 | ||
420 | cfg->fc_mx = mx; | |
421 | cfg->fc_mx_len = len; | |
422 | } | |
423 | ||
424 | return 0; | |
425 | } | |
426 | ||
1da177e4 | 427 | /* |
6a31d2a9 ED |
428 | * Handle IP routing ioctl calls. |
429 | * These are used to manipulate the routing tables | |
1da177e4 | 430 | */ |
1bad118a | 431 | int ip_rt_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
1da177e4 | 432 | { |
4e902c57 TG |
433 | struct fib_config cfg; |
434 | struct rtentry rt; | |
1da177e4 | 435 | int err; |
1da177e4 LT |
436 | |
437 | switch (cmd) { | |
438 | case SIOCADDRT: /* Add a route */ | |
439 | case SIOCDELRT: /* Delete a route */ | |
440 | if (!capable(CAP_NET_ADMIN)) | |
441 | return -EPERM; | |
4e902c57 TG |
442 | |
443 | if (copy_from_user(&rt, arg, sizeof(rt))) | |
1da177e4 | 444 | return -EFAULT; |
4e902c57 | 445 | |
1da177e4 | 446 | rtnl_lock(); |
1bad118a | 447 | err = rtentry_to_fib_config(net, cmd, &rt, &cfg); |
1da177e4 | 448 | if (err == 0) { |
4e902c57 TG |
449 | struct fib_table *tb; |
450 | ||
1da177e4 | 451 | if (cmd == SIOCDELRT) { |
1bad118a | 452 | tb = fib_get_table(net, cfg.fc_table); |
1da177e4 | 453 | if (tb) |
16c6cf8b | 454 | err = fib_table_delete(tb, &cfg); |
4e902c57 TG |
455 | else |
456 | err = -ESRCH; | |
1da177e4 | 457 | } else { |
1bad118a | 458 | tb = fib_new_table(net, cfg.fc_table); |
1da177e4 | 459 | if (tb) |
16c6cf8b | 460 | err = fib_table_insert(tb, &cfg); |
4e902c57 TG |
461 | else |
462 | err = -ENOBUFS; | |
1da177e4 | 463 | } |
4e902c57 TG |
464 | |
465 | /* allocated by rtentry_to_fib_config() */ | |
466 | kfree(cfg.fc_mx); | |
1da177e4 LT |
467 | } |
468 | rtnl_unlock(); | |
469 | return err; | |
470 | } | |
471 | return -EINVAL; | |
472 | } | |
473 | ||
6a31d2a9 | 474 | const struct nla_policy rtm_ipv4_policy[RTA_MAX + 1] = { |
4e902c57 TG |
475 | [RTA_DST] = { .type = NLA_U32 }, |
476 | [RTA_SRC] = { .type = NLA_U32 }, | |
477 | [RTA_IIF] = { .type = NLA_U32 }, | |
478 | [RTA_OIF] = { .type = NLA_U32 }, | |
479 | [RTA_GATEWAY] = { .type = NLA_U32 }, | |
480 | [RTA_PRIORITY] = { .type = NLA_U32 }, | |
481 | [RTA_PREFSRC] = { .type = NLA_U32 }, | |
482 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
5176f91e | 483 | [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) }, |
4e902c57 | 484 | [RTA_FLOW] = { .type = NLA_U32 }, |
4e902c57 TG |
485 | }; |
486 | ||
4b5d47d4 | 487 | static int rtm_to_fib_config(struct net *net, struct sk_buff *skb, |
6a31d2a9 | 488 | struct nlmsghdr *nlh, struct fib_config *cfg) |
1da177e4 | 489 | { |
4e902c57 TG |
490 | struct nlattr *attr; |
491 | int err, remaining; | |
492 | struct rtmsg *rtm; | |
493 | ||
494 | err = nlmsg_validate(nlh, sizeof(*rtm), RTA_MAX, rtm_ipv4_policy); | |
495 | if (err < 0) | |
496 | goto errout; | |
497 | ||
498 | memset(cfg, 0, sizeof(*cfg)); | |
499 | ||
500 | rtm = nlmsg_data(nlh); | |
4e902c57 | 501 | cfg->fc_dst_len = rtm->rtm_dst_len; |
4e902c57 TG |
502 | cfg->fc_tos = rtm->rtm_tos; |
503 | cfg->fc_table = rtm->rtm_table; | |
504 | cfg->fc_protocol = rtm->rtm_protocol; | |
505 | cfg->fc_scope = rtm->rtm_scope; | |
506 | cfg->fc_type = rtm->rtm_type; | |
507 | cfg->fc_flags = rtm->rtm_flags; | |
508 | cfg->fc_nlflags = nlh->nlmsg_flags; | |
509 | ||
510 | cfg->fc_nlinfo.pid = NETLINK_CB(skb).pid; | |
511 | cfg->fc_nlinfo.nlh = nlh; | |
4b5d47d4 | 512 | cfg->fc_nlinfo.nl_net = net; |
4e902c57 | 513 | |
a0ee18b9 TG |
514 | if (cfg->fc_type > RTN_MAX) { |
515 | err = -EINVAL; | |
516 | goto errout; | |
517 | } | |
518 | ||
4e902c57 | 519 | nlmsg_for_each_attr(attr, nlh, sizeof(struct rtmsg), remaining) { |
8f4c1f9b | 520 | switch (nla_type(attr)) { |
4e902c57 | 521 | case RTA_DST: |
17fb2c64 | 522 | cfg->fc_dst = nla_get_be32(attr); |
4e902c57 | 523 | break; |
4e902c57 TG |
524 | case RTA_OIF: |
525 | cfg->fc_oif = nla_get_u32(attr); | |
526 | break; | |
527 | case RTA_GATEWAY: | |
17fb2c64 | 528 | cfg->fc_gw = nla_get_be32(attr); |
4e902c57 TG |
529 | break; |
530 | case RTA_PRIORITY: | |
531 | cfg->fc_priority = nla_get_u32(attr); | |
532 | break; | |
533 | case RTA_PREFSRC: | |
17fb2c64 | 534 | cfg->fc_prefsrc = nla_get_be32(attr); |
4e902c57 TG |
535 | break; |
536 | case RTA_METRICS: | |
537 | cfg->fc_mx = nla_data(attr); | |
538 | cfg->fc_mx_len = nla_len(attr); | |
539 | break; | |
540 | case RTA_MULTIPATH: | |
541 | cfg->fc_mp = nla_data(attr); | |
542 | cfg->fc_mp_len = nla_len(attr); | |
543 | break; | |
544 | case RTA_FLOW: | |
545 | cfg->fc_flow = nla_get_u32(attr); | |
546 | break; | |
4e902c57 TG |
547 | case RTA_TABLE: |
548 | cfg->fc_table = nla_get_u32(attr); | |
549 | break; | |
1da177e4 LT |
550 | } |
551 | } | |
4e902c57 | 552 | |
1da177e4 | 553 | return 0; |
4e902c57 TG |
554 | errout: |
555 | return err; | |
1da177e4 LT |
556 | } |
557 | ||
6ed2533e | 558 | static int inet_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) |
1da177e4 | 559 | { |
3b1e0a65 | 560 | struct net *net = sock_net(skb->sk); |
4e902c57 TG |
561 | struct fib_config cfg; |
562 | struct fib_table *tb; | |
563 | int err; | |
1da177e4 | 564 | |
4b5d47d4 | 565 | err = rtm_to_fib_config(net, skb, nlh, &cfg); |
4e902c57 TG |
566 | if (err < 0) |
567 | goto errout; | |
1da177e4 | 568 | |
8ad4942c | 569 | tb = fib_get_table(net, cfg.fc_table); |
4e902c57 TG |
570 | if (tb == NULL) { |
571 | err = -ESRCH; | |
572 | goto errout; | |
573 | } | |
574 | ||
16c6cf8b | 575 | err = fib_table_delete(tb, &cfg); |
4e902c57 TG |
576 | errout: |
577 | return err; | |
1da177e4 LT |
578 | } |
579 | ||
6ed2533e | 580 | static int inet_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) |
1da177e4 | 581 | { |
3b1e0a65 | 582 | struct net *net = sock_net(skb->sk); |
4e902c57 TG |
583 | struct fib_config cfg; |
584 | struct fib_table *tb; | |
585 | int err; | |
1da177e4 | 586 | |
4b5d47d4 | 587 | err = rtm_to_fib_config(net, skb, nlh, &cfg); |
4e902c57 TG |
588 | if (err < 0) |
589 | goto errout; | |
1da177e4 | 590 | |
226b0b4a | 591 | tb = fib_new_table(net, cfg.fc_table); |
4e902c57 TG |
592 | if (tb == NULL) { |
593 | err = -ENOBUFS; | |
594 | goto errout; | |
595 | } | |
596 | ||
16c6cf8b | 597 | err = fib_table_insert(tb, &cfg); |
4e902c57 TG |
598 | errout: |
599 | return err; | |
1da177e4 LT |
600 | } |
601 | ||
63f3444f | 602 | static int inet_dump_fib(struct sk_buff *skb, struct netlink_callback *cb) |
1da177e4 | 603 | { |
3b1e0a65 | 604 | struct net *net = sock_net(skb->sk); |
1af5a8c4 PM |
605 | unsigned int h, s_h; |
606 | unsigned int e = 0, s_e; | |
1da177e4 | 607 | struct fib_table *tb; |
1af5a8c4 | 608 | struct hlist_node *node; |
e4aef8ae | 609 | struct hlist_head *head; |
1af5a8c4 | 610 | int dumped = 0; |
1da177e4 | 611 | |
be403ea1 TG |
612 | if (nlmsg_len(cb->nlh) >= sizeof(struct rtmsg) && |
613 | ((struct rtmsg *) nlmsg_data(cb->nlh))->rtm_flags & RTM_F_CLONED) | |
1da177e4 LT |
614 | return ip_rt_dump(skb, cb); |
615 | ||
1af5a8c4 PM |
616 | s_h = cb->args[0]; |
617 | s_e = cb->args[1]; | |
618 | ||
619 | for (h = s_h; h < FIB_TABLE_HASHSZ; h++, s_e = 0) { | |
620 | e = 0; | |
e4aef8ae DL |
621 | head = &net->ipv4.fib_table_hash[h]; |
622 | hlist_for_each_entry(tb, node, head, tb_hlist) { | |
1af5a8c4 PM |
623 | if (e < s_e) |
624 | goto next; | |
625 | if (dumped) | |
626 | memset(&cb->args[2], 0, sizeof(cb->args) - | |
e905a9ed | 627 | 2 * sizeof(cb->args[0])); |
16c6cf8b | 628 | if (fib_table_dump(tb, skb, cb) < 0) |
1af5a8c4 PM |
629 | goto out; |
630 | dumped = 1; | |
631 | next: | |
632 | e++; | |
633 | } | |
1da177e4 | 634 | } |
1af5a8c4 PM |
635 | out: |
636 | cb->args[1] = e; | |
637 | cb->args[0] = h; | |
1da177e4 LT |
638 | |
639 | return skb->len; | |
640 | } | |
641 | ||
642 | /* Prepare and feed intra-kernel routing request. | |
6a31d2a9 ED |
643 | * Really, it should be netlink message, but :-( netlink |
644 | * can be not configured, so that we feed it directly | |
645 | * to fib engine. It is legal, because all events occur | |
646 | * only when netlink is already locked. | |
1da177e4 | 647 | */ |
81f7bf6c | 648 | static void fib_magic(int cmd, int type, __be32 dst, int dst_len, struct in_ifaddr *ifa) |
1da177e4 | 649 | { |
c346dca1 | 650 | struct net *net = dev_net(ifa->ifa_dev->dev); |
4e902c57 TG |
651 | struct fib_table *tb; |
652 | struct fib_config cfg = { | |
653 | .fc_protocol = RTPROT_KERNEL, | |
654 | .fc_type = type, | |
655 | .fc_dst = dst, | |
656 | .fc_dst_len = dst_len, | |
657 | .fc_prefsrc = ifa->ifa_local, | |
658 | .fc_oif = ifa->ifa_dev->dev->ifindex, | |
659 | .fc_nlflags = NLM_F_CREATE | NLM_F_APPEND, | |
4d1169c1 | 660 | .fc_nlinfo = { |
4b5d47d4 | 661 | .nl_net = net, |
4d1169c1 | 662 | }, |
4e902c57 | 663 | }; |
1da177e4 LT |
664 | |
665 | if (type == RTN_UNICAST) | |
4b5d47d4 | 666 | tb = fib_new_table(net, RT_TABLE_MAIN); |
1da177e4 | 667 | else |
4b5d47d4 | 668 | tb = fib_new_table(net, RT_TABLE_LOCAL); |
1da177e4 LT |
669 | |
670 | if (tb == NULL) | |
671 | return; | |
672 | ||
4e902c57 | 673 | cfg.fc_table = tb->tb_id; |
1da177e4 | 674 | |
4e902c57 TG |
675 | if (type != RTN_LOCAL) |
676 | cfg.fc_scope = RT_SCOPE_LINK; | |
677 | else | |
678 | cfg.fc_scope = RT_SCOPE_HOST; | |
1da177e4 LT |
679 | |
680 | if (cmd == RTM_NEWROUTE) | |
16c6cf8b | 681 | fib_table_insert(tb, &cfg); |
1da177e4 | 682 | else |
16c6cf8b | 683 | fib_table_delete(tb, &cfg); |
1da177e4 LT |
684 | } |
685 | ||
0ff60a45 | 686 | void fib_add_ifaddr(struct in_ifaddr *ifa) |
1da177e4 LT |
687 | { |
688 | struct in_device *in_dev = ifa->ifa_dev; | |
689 | struct net_device *dev = in_dev->dev; | |
690 | struct in_ifaddr *prim = ifa; | |
a144ea4b AV |
691 | __be32 mask = ifa->ifa_mask; |
692 | __be32 addr = ifa->ifa_local; | |
6a31d2a9 | 693 | __be32 prefix = ifa->ifa_address & mask; |
1da177e4 | 694 | |
6a31d2a9 | 695 | if (ifa->ifa_flags & IFA_F_SECONDARY) { |
1da177e4 LT |
696 | prim = inet_ifa_byprefix(in_dev, prefix, mask); |
697 | if (prim == NULL) { | |
a6db9010 | 698 | printk(KERN_WARNING "fib_add_ifaddr: bug: prim == NULL\n"); |
1da177e4 LT |
699 | return; |
700 | } | |
701 | } | |
702 | ||
703 | fib_magic(RTM_NEWROUTE, RTN_LOCAL, addr, 32, prim); | |
704 | ||
6a31d2a9 | 705 | if (!(dev->flags & IFF_UP)) |
1da177e4 LT |
706 | return; |
707 | ||
708 | /* Add broadcast address, if it is explicitly assigned. */ | |
a144ea4b | 709 | if (ifa->ifa_broadcast && ifa->ifa_broadcast != htonl(0xFFFFFFFF)) |
1da177e4 LT |
710 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim); |
711 | ||
6a31d2a9 | 712 | if (!ipv4_is_zeronet(prefix) && !(ifa->ifa_flags & IFA_F_SECONDARY) && |
1da177e4 | 713 | (prefix != addr || ifa->ifa_prefixlen < 32)) { |
6a31d2a9 ED |
714 | fib_magic(RTM_NEWROUTE, |
715 | dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST, | |
716 | prefix, ifa->ifa_prefixlen, prim); | |
1da177e4 LT |
717 | |
718 | /* Add network specific broadcasts, when it takes a sense */ | |
719 | if (ifa->ifa_prefixlen < 31) { | |
720 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix, 32, prim); | |
6a31d2a9 ED |
721 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix | ~mask, |
722 | 32, prim); | |
1da177e4 LT |
723 | } |
724 | } | |
725 | } | |
726 | ||
e6abbaa2 JA |
727 | /* Delete primary or secondary address. |
728 | * Optionally, on secondary address promotion consider the addresses | |
729 | * from subnet iprim as deleted, even if they are in device list. | |
730 | * In this case the secondary ifa can be in device list. | |
731 | */ | |
732 | void fib_del_ifaddr(struct in_ifaddr *ifa, struct in_ifaddr *iprim) | |
1da177e4 LT |
733 | { |
734 | struct in_device *in_dev = ifa->ifa_dev; | |
735 | struct net_device *dev = in_dev->dev; | |
736 | struct in_ifaddr *ifa1; | |
e6abbaa2 | 737 | struct in_ifaddr *prim = ifa, *prim1 = NULL; |
6a31d2a9 ED |
738 | __be32 brd = ifa->ifa_address | ~ifa->ifa_mask; |
739 | __be32 any = ifa->ifa_address & ifa->ifa_mask; | |
1da177e4 LT |
740 | #define LOCAL_OK 1 |
741 | #define BRD_OK 2 | |
742 | #define BRD0_OK 4 | |
743 | #define BRD1_OK 8 | |
744 | unsigned ok = 0; | |
e6abbaa2 JA |
745 | int subnet = 0; /* Primary network */ |
746 | int gone = 1; /* Address is missing */ | |
747 | int same_prefsrc = 0; /* Another primary with same IP */ | |
1da177e4 | 748 | |
e6abbaa2 | 749 | if (ifa->ifa_flags & IFA_F_SECONDARY) { |
1da177e4 LT |
750 | prim = inet_ifa_byprefix(in_dev, any, ifa->ifa_mask); |
751 | if (prim == NULL) { | |
a6db9010 | 752 | printk(KERN_WARNING "fib_del_ifaddr: bug: prim == NULL\n"); |
1da177e4 LT |
753 | return; |
754 | } | |
e6abbaa2 JA |
755 | if (iprim && iprim != prim) { |
756 | printk(KERN_WARNING "fib_del_ifaddr: bug: iprim != prim\n"); | |
757 | return; | |
758 | } | |
759 | } else if (!ipv4_is_zeronet(any) && | |
760 | (any != ifa->ifa_local || ifa->ifa_prefixlen < 32)) { | |
761 | fib_magic(RTM_DELROUTE, | |
762 | dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST, | |
763 | any, ifa->ifa_prefixlen, prim); | |
764 | subnet = 1; | |
1da177e4 LT |
765 | } |
766 | ||
767 | /* Deletion is more complicated than add. | |
6a31d2a9 ED |
768 | * We should take care of not to delete too much :-) |
769 | * | |
770 | * Scan address list to be sure that addresses are really gone. | |
1da177e4 LT |
771 | */ |
772 | ||
773 | for (ifa1 = in_dev->ifa_list; ifa1; ifa1 = ifa1->ifa_next) { | |
e6abbaa2 JA |
774 | if (ifa1 == ifa) { |
775 | /* promotion, keep the IP */ | |
776 | gone = 0; | |
777 | continue; | |
778 | } | |
779 | /* Ignore IFAs from our subnet */ | |
780 | if (iprim && ifa1->ifa_mask == iprim->ifa_mask && | |
781 | inet_ifa_match(ifa1->ifa_address, iprim)) | |
782 | continue; | |
783 | ||
784 | /* Ignore ifa1 if it uses different primary IP (prefsrc) */ | |
785 | if (ifa1->ifa_flags & IFA_F_SECONDARY) { | |
786 | /* Another address from our subnet? */ | |
787 | if (ifa1->ifa_mask == prim->ifa_mask && | |
788 | inet_ifa_match(ifa1->ifa_address, prim)) | |
789 | prim1 = prim; | |
790 | else { | |
791 | /* We reached the secondaries, so | |
792 | * same_prefsrc should be determined. | |
793 | */ | |
794 | if (!same_prefsrc) | |
795 | continue; | |
796 | /* Search new prim1 if ifa1 is not | |
797 | * using the current prim1 | |
798 | */ | |
799 | if (!prim1 || | |
800 | ifa1->ifa_mask != prim1->ifa_mask || | |
801 | !inet_ifa_match(ifa1->ifa_address, prim1)) | |
802 | prim1 = inet_ifa_byprefix(in_dev, | |
803 | ifa1->ifa_address, | |
804 | ifa1->ifa_mask); | |
805 | if (!prim1) | |
806 | continue; | |
807 | if (prim1->ifa_local != prim->ifa_local) | |
808 | continue; | |
809 | } | |
810 | } else { | |
811 | if (prim->ifa_local != ifa1->ifa_local) | |
812 | continue; | |
813 | prim1 = ifa1; | |
814 | if (prim != prim1) | |
815 | same_prefsrc = 1; | |
816 | } | |
1da177e4 LT |
817 | if (ifa->ifa_local == ifa1->ifa_local) |
818 | ok |= LOCAL_OK; | |
819 | if (ifa->ifa_broadcast == ifa1->ifa_broadcast) | |
820 | ok |= BRD_OK; | |
821 | if (brd == ifa1->ifa_broadcast) | |
822 | ok |= BRD1_OK; | |
823 | if (any == ifa1->ifa_broadcast) | |
824 | ok |= BRD0_OK; | |
e6abbaa2 JA |
825 | /* primary has network specific broadcasts */ |
826 | if (prim1 == ifa1 && ifa1->ifa_prefixlen < 31) { | |
827 | __be32 brd1 = ifa1->ifa_address | ~ifa1->ifa_mask; | |
828 | __be32 any1 = ifa1->ifa_address & ifa1->ifa_mask; | |
829 | ||
830 | if (!ipv4_is_zeronet(any1)) { | |
831 | if (ifa->ifa_broadcast == brd1 || | |
832 | ifa->ifa_broadcast == any1) | |
833 | ok |= BRD_OK; | |
834 | if (brd == brd1 || brd == any1) | |
835 | ok |= BRD1_OK; | |
836 | if (any == brd1 || any == any1) | |
837 | ok |= BRD0_OK; | |
838 | } | |
839 | } | |
1da177e4 LT |
840 | } |
841 | ||
6a31d2a9 | 842 | if (!(ok & BRD_OK)) |
1da177e4 | 843 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim); |
e6abbaa2 JA |
844 | if (subnet && ifa->ifa_prefixlen < 31) { |
845 | if (!(ok & BRD1_OK)) | |
846 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, brd, 32, prim); | |
847 | if (!(ok & BRD0_OK)) | |
848 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, any, 32, prim); | |
849 | } | |
6a31d2a9 | 850 | if (!(ok & LOCAL_OK)) { |
1da177e4 LT |
851 | fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 32, prim); |
852 | ||
853 | /* Check, that this local address finally disappeared. */ | |
e6abbaa2 JA |
854 | if (gone && |
855 | inet_addr_type(dev_net(dev), ifa->ifa_local) != RTN_LOCAL) { | |
1da177e4 | 856 | /* And the last, but not the least thing. |
6a31d2a9 ED |
857 | * We must flush stray FIB entries. |
858 | * | |
859 | * First of all, we scan fib_info list searching | |
860 | * for stray nexthop entries, then ignite fib_flush. | |
861 | */ | |
c346dca1 YH |
862 | if (fib_sync_down_addr(dev_net(dev), ifa->ifa_local)) |
863 | fib_flush(dev_net(dev)); | |
1da177e4 LT |
864 | } |
865 | } | |
866 | #undef LOCAL_OK | |
867 | #undef BRD_OK | |
868 | #undef BRD0_OK | |
869 | #undef BRD1_OK | |
870 | } | |
871 | ||
6a31d2a9 | 872 | static void nl_fib_lookup(struct fib_result_nl *frn, struct fib_table *tb) |
246955fe | 873 | { |
e905a9ed | 874 | |
246955fe | 875 | struct fib_result res; |
9ade2286 DM |
876 | struct flowi4 fl4 = { |
877 | .flowi4_mark = frn->fl_mark, | |
878 | .daddr = frn->fl_addr, | |
879 | .flowi4_tos = frn->fl_tos, | |
880 | .flowi4_scope = frn->fl_scope, | |
6a31d2a9 | 881 | }; |
1194ed0a | 882 | |
912a41a4 SV |
883 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
884 | res.r = NULL; | |
885 | #endif | |
886 | ||
1194ed0a | 887 | frn->err = -ENOENT; |
246955fe RO |
888 | if (tb) { |
889 | local_bh_disable(); | |
890 | ||
891 | frn->tb_id = tb->tb_id; | |
ebc0ffae | 892 | rcu_read_lock(); |
9ade2286 | 893 | frn->err = fib_table_lookup(tb, &fl4, &res, FIB_LOOKUP_NOREF); |
246955fe RO |
894 | |
895 | if (!frn->err) { | |
896 | frn->prefixlen = res.prefixlen; | |
897 | frn->nh_sel = res.nh_sel; | |
898 | frn->type = res.type; | |
899 | frn->scope = res.scope; | |
900 | } | |
ebc0ffae | 901 | rcu_read_unlock(); |
246955fe RO |
902 | local_bh_enable(); |
903 | } | |
904 | } | |
905 | ||
28f7b036 | 906 | static void nl_fib_input(struct sk_buff *skb) |
246955fe | 907 | { |
6bd48fcf | 908 | struct net *net; |
246955fe | 909 | struct fib_result_nl *frn; |
28f7b036 | 910 | struct nlmsghdr *nlh; |
246955fe | 911 | struct fib_table *tb; |
28f7b036 | 912 | u32 pid; |
1194ed0a | 913 | |
3b1e0a65 | 914 | net = sock_net(skb->sk); |
b529ccf2 | 915 | nlh = nlmsg_hdr(skb); |
ea86575e | 916 | if (skb->len < NLMSG_SPACE(0) || skb->len < nlh->nlmsg_len || |
d883a036 | 917 | nlh->nlmsg_len < NLMSG_LENGTH(sizeof(*frn))) |
ea86575e | 918 | return; |
d883a036 DL |
919 | |
920 | skb = skb_clone(skb, GFP_KERNEL); | |
921 | if (skb == NULL) | |
922 | return; | |
923 | nlh = nlmsg_hdr(skb); | |
e905a9ed | 924 | |
246955fe | 925 | frn = (struct fib_result_nl *) NLMSG_DATA(nlh); |
6bd48fcf | 926 | tb = fib_get_table(net, frn->tb_id_in); |
246955fe RO |
927 | |
928 | nl_fib_lookup(frn, tb); | |
e905a9ed | 929 | |
6a31d2a9 ED |
930 | pid = NETLINK_CB(skb).pid; /* pid of sending process */ |
931 | NETLINK_CB(skb).pid = 0; /* from kernel */ | |
ac6d439d | 932 | NETLINK_CB(skb).dst_group = 0; /* unicast */ |
6bd48fcf | 933 | netlink_unicast(net->ipv4.fibnl, skb, pid, MSG_DONTWAIT); |
e905a9ed | 934 | } |
246955fe | 935 | |
2c8c1e72 | 936 | static int __net_init nl_fib_lookup_init(struct net *net) |
246955fe | 937 | { |
6bd48fcf DL |
938 | struct sock *sk; |
939 | sk = netlink_kernel_create(net, NETLINK_FIB_LOOKUP, 0, | |
940 | nl_fib_input, NULL, THIS_MODULE); | |
941 | if (sk == NULL) | |
7b1a74fd | 942 | return -EAFNOSUPPORT; |
6bd48fcf | 943 | net->ipv4.fibnl = sk; |
7b1a74fd DL |
944 | return 0; |
945 | } | |
946 | ||
947 | static void nl_fib_lookup_exit(struct net *net) | |
948 | { | |
b7c6ba6e | 949 | netlink_kernel_release(net->ipv4.fibnl); |
775516bf | 950 | net->ipv4.fibnl = NULL; |
246955fe RO |
951 | } |
952 | ||
e2ce1468 | 953 | static void fib_disable_ip(struct net_device *dev, int force, int delay) |
1da177e4 | 954 | { |
85326fa5 | 955 | if (fib_sync_down_dev(dev, force)) |
c346dca1 | 956 | fib_flush(dev_net(dev)); |
e2ce1468 | 957 | rt_cache_flush(dev_net(dev), delay); |
1da177e4 LT |
958 | arp_ifdown(dev); |
959 | } | |
960 | ||
961 | static int fib_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr) | |
962 | { | |
6ed2533e | 963 | struct in_ifaddr *ifa = (struct in_ifaddr *)ptr; |
76e6ebfb | 964 | struct net_device *dev = ifa->ifa_dev->dev; |
436c3b66 | 965 | struct net *net = dev_net(dev); |
1da177e4 LT |
966 | |
967 | switch (event) { | |
968 | case NETDEV_UP: | |
969 | fib_add_ifaddr(ifa); | |
970 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
76e6ebfb | 971 | fib_sync_up(dev); |
1da177e4 | 972 | #endif |
436c3b66 | 973 | atomic_inc(&net->ipv4.dev_addr_genid); |
76e6ebfb | 974 | rt_cache_flush(dev_net(dev), -1); |
1da177e4 LT |
975 | break; |
976 | case NETDEV_DOWN: | |
e6abbaa2 | 977 | fib_del_ifaddr(ifa, NULL); |
436c3b66 | 978 | atomic_inc(&net->ipv4.dev_addr_genid); |
9fcc2e8a | 979 | if (ifa->ifa_dev->ifa_list == NULL) { |
1da177e4 | 980 | /* Last address was deleted from this interface. |
6a31d2a9 | 981 | * Disable IP. |
1da177e4 | 982 | */ |
e2ce1468 | 983 | fib_disable_ip(dev, 1, 0); |
1da177e4 | 984 | } else { |
76e6ebfb | 985 | rt_cache_flush(dev_net(dev), -1); |
1da177e4 LT |
986 | } |
987 | break; | |
988 | } | |
989 | return NOTIFY_DONE; | |
990 | } | |
991 | ||
992 | static int fib_netdev_event(struct notifier_block *this, unsigned long event, void *ptr) | |
993 | { | |
994 | struct net_device *dev = ptr; | |
e5ed6399 | 995 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
436c3b66 | 996 | struct net *net = dev_net(dev); |
1da177e4 LT |
997 | |
998 | if (event == NETDEV_UNREGISTER) { | |
e2ce1468 | 999 | fib_disable_ip(dev, 2, -1); |
1da177e4 LT |
1000 | return NOTIFY_DONE; |
1001 | } | |
1002 | ||
1003 | if (!in_dev) | |
1004 | return NOTIFY_DONE; | |
1005 | ||
1006 | switch (event) { | |
1007 | case NETDEV_UP: | |
1008 | for_ifa(in_dev) { | |
1009 | fib_add_ifaddr(ifa); | |
1010 | } endfor_ifa(in_dev); | |
1011 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
1012 | fib_sync_up(dev); | |
1013 | #endif | |
436c3b66 | 1014 | atomic_inc(&net->ipv4.dev_addr_genid); |
76e6ebfb | 1015 | rt_cache_flush(dev_net(dev), -1); |
1da177e4 LT |
1016 | break; |
1017 | case NETDEV_DOWN: | |
e2ce1468 | 1018 | fib_disable_ip(dev, 0, 0); |
1da177e4 LT |
1019 | break; |
1020 | case NETDEV_CHANGEMTU: | |
1021 | case NETDEV_CHANGE: | |
76e6ebfb | 1022 | rt_cache_flush(dev_net(dev), 0); |
1da177e4 | 1023 | break; |
a5ee1551 | 1024 | case NETDEV_UNREGISTER_BATCH: |
6561a3b1 DM |
1025 | /* The batch unregister is only called on the first |
1026 | * device in the list of devices being unregistered. | |
1027 | * Therefore we should not pass dev_net(dev) in here. | |
1028 | */ | |
1029 | rt_cache_flush_batch(NULL); | |
a5ee1551 | 1030 | break; |
1da177e4 LT |
1031 | } |
1032 | return NOTIFY_DONE; | |
1033 | } | |
1034 | ||
1035 | static struct notifier_block fib_inetaddr_notifier = { | |
6ed2533e | 1036 | .notifier_call = fib_inetaddr_event, |
1da177e4 LT |
1037 | }; |
1038 | ||
1039 | static struct notifier_block fib_netdev_notifier = { | |
6ed2533e | 1040 | .notifier_call = fib_netdev_event, |
1da177e4 LT |
1041 | }; |
1042 | ||
7b1a74fd | 1043 | static int __net_init ip_fib_net_init(struct net *net) |
1da177e4 | 1044 | { |
dce5cbee | 1045 | int err; |
10da66f7 ED |
1046 | size_t size = sizeof(struct hlist_head) * FIB_TABLE_HASHSZ; |
1047 | ||
1048 | /* Avoid false sharing : Use at least a full cache line */ | |
1049 | size = max_t(size_t, size, L1_CACHE_BYTES); | |
1af5a8c4 | 1050 | |
10da66f7 | 1051 | net->ipv4.fib_table_hash = kzalloc(size, GFP_KERNEL); |
e4aef8ae DL |
1052 | if (net->ipv4.fib_table_hash == NULL) |
1053 | return -ENOMEM; | |
1054 | ||
dce5cbee DL |
1055 | err = fib4_rules_init(net); |
1056 | if (err < 0) | |
1057 | goto fail; | |
1058 | return 0; | |
1059 | ||
1060 | fail: | |
1061 | kfree(net->ipv4.fib_table_hash); | |
1062 | return err; | |
7b1a74fd | 1063 | } |
1da177e4 | 1064 | |
2c8c1e72 | 1065 | static void ip_fib_net_exit(struct net *net) |
7b1a74fd DL |
1066 | { |
1067 | unsigned int i; | |
1068 | ||
1069 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
1070 | fib4_rules_exit(net); | |
1071 | #endif | |
1072 | ||
e2666f84 | 1073 | rtnl_lock(); |
7b1a74fd DL |
1074 | for (i = 0; i < FIB_TABLE_HASHSZ; i++) { |
1075 | struct fib_table *tb; | |
1076 | struct hlist_head *head; | |
1077 | struct hlist_node *node, *tmp; | |
63f3444f | 1078 | |
e4aef8ae | 1079 | head = &net->ipv4.fib_table_hash[i]; |
7b1a74fd DL |
1080 | hlist_for_each_entry_safe(tb, node, tmp, head, tb_hlist) { |
1081 | hlist_del(node); | |
16c6cf8b | 1082 | fib_table_flush(tb); |
4aa2c466 | 1083 | fib_free_table(tb); |
7b1a74fd DL |
1084 | } |
1085 | } | |
e2666f84 | 1086 | rtnl_unlock(); |
e4aef8ae | 1087 | kfree(net->ipv4.fib_table_hash); |
7b1a74fd DL |
1088 | } |
1089 | ||
1090 | static int __net_init fib_net_init(struct net *net) | |
1091 | { | |
1092 | int error; | |
1093 | ||
7b1a74fd DL |
1094 | error = ip_fib_net_init(net); |
1095 | if (error < 0) | |
1096 | goto out; | |
1097 | error = nl_fib_lookup_init(net); | |
1098 | if (error < 0) | |
1099 | goto out_nlfl; | |
1100 | error = fib_proc_init(net); | |
1101 | if (error < 0) | |
1102 | goto out_proc; | |
1103 | out: | |
1104 | return error; | |
1105 | ||
1106 | out_proc: | |
1107 | nl_fib_lookup_exit(net); | |
1108 | out_nlfl: | |
1109 | ip_fib_net_exit(net); | |
1110 | goto out; | |
1111 | } | |
1112 | ||
1113 | static void __net_exit fib_net_exit(struct net *net) | |
1114 | { | |
1115 | fib_proc_exit(net); | |
1116 | nl_fib_lookup_exit(net); | |
1117 | ip_fib_net_exit(net); | |
1118 | } | |
1119 | ||
1120 | static struct pernet_operations fib_net_ops = { | |
1121 | .init = fib_net_init, | |
1122 | .exit = fib_net_exit, | |
1123 | }; | |
1124 | ||
1125 | void __init ip_fib_init(void) | |
1126 | { | |
c7ac8679 GR |
1127 | rtnl_register(PF_INET, RTM_NEWROUTE, inet_rtm_newroute, NULL, NULL); |
1128 | rtnl_register(PF_INET, RTM_DELROUTE, inet_rtm_delroute, NULL, NULL); | |
1129 | rtnl_register(PF_INET, RTM_GETROUTE, NULL, inet_dump_fib, NULL); | |
7b1a74fd DL |
1130 | |
1131 | register_pernet_subsys(&fib_net_ops); | |
1132 | register_netdevice_notifier(&fib_netdev_notifier); | |
1133 | register_inetaddr_notifier(&fib_inetaddr_notifier); | |
7f9b8052 | 1134 | |
5348ba85 | 1135 | fib_trie_init(); |
1da177e4 | 1136 | } |