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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> |
1da177e4 LT |
37 | |
38 | #include <net/ip.h> | |
39 | #include <net/protocol.h> | |
40 | #include <net/route.h> | |
41 | #include <net/tcp.h> | |
42 | #include <net/sock.h> | |
1da177e4 LT |
43 | #include <net/arp.h> |
44 | #include <net/ip_fib.h> | |
63f3444f | 45 | #include <net/rtnetlink.h> |
1da177e4 | 46 | |
1da177e4 LT |
47 | #ifndef CONFIG_IP_MULTIPLE_TABLES |
48 | ||
7b1a74fd | 49 | static int __net_init fib4_rules_init(struct net *net) |
c3e9a353 | 50 | { |
93456b6d DL |
51 | struct fib_table *local_table, *main_table; |
52 | ||
7f9b8052 | 53 | local_table = fib_hash_table(RT_TABLE_LOCAL); |
93456b6d | 54 | if (local_table == NULL) |
dbb50165 DL |
55 | return -ENOMEM; |
56 | ||
7f9b8052 | 57 | main_table = fib_hash_table(RT_TABLE_MAIN); |
93456b6d | 58 | if (main_table == NULL) |
dbb50165 DL |
59 | goto fail; |
60 | ||
93456b6d | 61 | hlist_add_head_rcu(&local_table->tb_hlist, |
e4aef8ae | 62 | &net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX]); |
93456b6d | 63 | hlist_add_head_rcu(&main_table->tb_hlist, |
e4aef8ae | 64 | &net->ipv4.fib_table_hash[TABLE_MAIN_INDEX]); |
dbb50165 DL |
65 | return 0; |
66 | ||
67 | fail: | |
93456b6d | 68 | kfree(local_table); |
dbb50165 | 69 | return -ENOMEM; |
c3e9a353 | 70 | } |
1af5a8c4 | 71 | #else |
1da177e4 | 72 | |
8ad4942c | 73 | struct fib_table *fib_new_table(struct net *net, u32 id) |
1da177e4 LT |
74 | { |
75 | struct fib_table *tb; | |
1af5a8c4 | 76 | unsigned int h; |
1da177e4 | 77 | |
1af5a8c4 PM |
78 | if (id == 0) |
79 | id = RT_TABLE_MAIN; | |
8ad4942c | 80 | tb = fib_get_table(net, id); |
1af5a8c4 PM |
81 | if (tb) |
82 | return tb; | |
7f9b8052 SH |
83 | |
84 | tb = fib_hash_table(id); | |
1da177e4 LT |
85 | if (!tb) |
86 | return NULL; | |
1af5a8c4 | 87 | h = id & (FIB_TABLE_HASHSZ - 1); |
e4aef8ae | 88 | hlist_add_head_rcu(&tb->tb_hlist, &net->ipv4.fib_table_hash[h]); |
1da177e4 LT |
89 | return tb; |
90 | } | |
91 | ||
8ad4942c | 92 | struct fib_table *fib_get_table(struct net *net, u32 id) |
1af5a8c4 PM |
93 | { |
94 | struct fib_table *tb; | |
95 | struct hlist_node *node; | |
e4aef8ae | 96 | struct hlist_head *head; |
1af5a8c4 | 97 | unsigned int h; |
1da177e4 | 98 | |
1af5a8c4 PM |
99 | if (id == 0) |
100 | id = RT_TABLE_MAIN; | |
101 | h = id & (FIB_TABLE_HASHSZ - 1); | |
e4aef8ae | 102 | |
1af5a8c4 | 103 | rcu_read_lock(); |
e4aef8ae DL |
104 | head = &net->ipv4.fib_table_hash[h]; |
105 | hlist_for_each_entry_rcu(tb, node, head, tb_hlist) { | |
1af5a8c4 PM |
106 | if (tb->tb_id == id) { |
107 | rcu_read_unlock(); | |
108 | return tb; | |
109 | } | |
110 | } | |
111 | rcu_read_unlock(); | |
112 | return NULL; | |
113 | } | |
1da177e4 LT |
114 | #endif /* CONFIG_IP_MULTIPLE_TABLES */ |
115 | ||
010278ec DL |
116 | void fib_select_default(struct net *net, |
117 | const struct flowi *flp, struct fib_result *res) | |
64c2d538 DL |
118 | { |
119 | struct fib_table *tb; | |
120 | int table = RT_TABLE_MAIN; | |
121 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
122 | if (res->r == NULL || res->r->action != FR_ACT_TO_TBL) | |
123 | return; | |
124 | table = res->r->table; | |
125 | #endif | |
010278ec | 126 | tb = fib_get_table(net, table); |
64c2d538 | 127 | if (FIB_RES_GW(*res) && FIB_RES_NH(*res).nh_scope == RT_SCOPE_LINK) |
16c6cf8b | 128 | fib_table_select_default(tb, flp, res); |
64c2d538 DL |
129 | } |
130 | ||
e4aef8ae | 131 | static void fib_flush(struct net *net) |
1da177e4 LT |
132 | { |
133 | int flushed = 0; | |
1da177e4 | 134 | struct fib_table *tb; |
1af5a8c4 | 135 | struct hlist_node *node; |
e4aef8ae | 136 | struct hlist_head *head; |
1af5a8c4 | 137 | unsigned int h; |
1da177e4 | 138 | |
1af5a8c4 | 139 | for (h = 0; h < FIB_TABLE_HASHSZ; h++) { |
e4aef8ae DL |
140 | head = &net->ipv4.fib_table_hash[h]; |
141 | hlist_for_each_entry(tb, node, head, tb_hlist) | |
16c6cf8b | 142 | flushed += fib_table_flush(tb); |
1da177e4 | 143 | } |
1da177e4 LT |
144 | |
145 | if (flushed) | |
76e6ebfb | 146 | rt_cache_flush(net, -1); |
1da177e4 LT |
147 | } |
148 | ||
149 | /* | |
150 | * Find the first device with a given source address. | |
151 | */ | |
152 | ||
1ab35276 | 153 | struct net_device * ip_dev_find(struct net *net, __be32 addr) |
1da177e4 LT |
154 | { |
155 | struct flowi fl = { .nl_u = { .ip4_u = { .daddr = addr } } }; | |
156 | struct fib_result res; | |
157 | struct net_device *dev = NULL; | |
03cf786c | 158 | struct fib_table *local_table; |
1da177e4 LT |
159 | |
160 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
161 | res.r = NULL; | |
162 | #endif | |
163 | ||
1ab35276 | 164 | local_table = fib_get_table(net, RT_TABLE_LOCAL); |
16c6cf8b | 165 | if (!local_table || fib_table_lookup(local_table, &fl, &res)) |
1da177e4 LT |
166 | return NULL; |
167 | if (res.type != RTN_LOCAL) | |
168 | goto out; | |
169 | dev = FIB_RES_DEV(res); | |
170 | ||
171 | if (dev) | |
172 | dev_hold(dev); | |
173 | out: | |
174 | fib_res_put(&res); | |
175 | return dev; | |
176 | } | |
177 | ||
05538116 LAT |
178 | /* |
179 | * Find address type as if only "dev" was present in the system. If | |
180 | * on_dev is NULL then all interfaces are taken into consideration. | |
181 | */ | |
6b175b26 EB |
182 | static inline unsigned __inet_dev_addr_type(struct net *net, |
183 | const struct net_device *dev, | |
05538116 | 184 | __be32 addr) |
1da177e4 LT |
185 | { |
186 | struct flowi fl = { .nl_u = { .ip4_u = { .daddr = addr } } }; | |
187 | struct fib_result res; | |
188 | unsigned ret = RTN_BROADCAST; | |
03cf786c | 189 | struct fib_table *local_table; |
1da177e4 | 190 | |
1e637c74 | 191 | if (ipv4_is_zeronet(addr) || ipv4_is_lbcast(addr)) |
1da177e4 | 192 | return RTN_BROADCAST; |
f97c1e0c | 193 | if (ipv4_is_multicast(addr)) |
1da177e4 LT |
194 | return RTN_MULTICAST; |
195 | ||
196 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
197 | res.r = NULL; | |
198 | #endif | |
e905a9ed | 199 | |
6b175b26 | 200 | local_table = fib_get_table(net, RT_TABLE_LOCAL); |
03cf786c | 201 | if (local_table) { |
1da177e4 | 202 | ret = RTN_UNICAST; |
16c6cf8b | 203 | if (!fib_table_lookup(local_table, &fl, &res)) { |
05538116 LAT |
204 | if (!dev || dev == res.fi->fib_dev) |
205 | ret = res.type; | |
1da177e4 LT |
206 | fib_res_put(&res); |
207 | } | |
208 | } | |
209 | return ret; | |
210 | } | |
211 | ||
6b175b26 | 212 | unsigned int inet_addr_type(struct net *net, __be32 addr) |
05538116 | 213 | { |
6b175b26 | 214 | return __inet_dev_addr_type(net, NULL, addr); |
05538116 LAT |
215 | } |
216 | ||
6b175b26 EB |
217 | unsigned int inet_dev_addr_type(struct net *net, const struct net_device *dev, |
218 | __be32 addr) | |
05538116 | 219 | { |
6b175b26 | 220 | return __inet_dev_addr_type(net, dev, addr); |
05538116 LAT |
221 | } |
222 | ||
1da177e4 LT |
223 | /* Given (packet source, input interface) and optional (dst, oif, tos): |
224 | - (main) check, that source is valid i.e. not broadcast or our local | |
225 | address. | |
226 | - figure out what "logical" interface this packet arrived | |
227 | and calculate "specific destination" address. | |
228 | - check, that packet arrived from expected physical interface. | |
229 | */ | |
230 | ||
d9c9df8c | 231 | int fib_validate_source(__be32 src, __be32 dst, u8 tos, int oif, |
b0c110ca | 232 | struct net_device *dev, __be32 *spec_dst, |
233 | u32 *itag, u32 mark) | |
1da177e4 LT |
234 | { |
235 | struct in_device *in_dev; | |
236 | struct flowi fl = { .nl_u = { .ip4_u = | |
237 | { .daddr = src, | |
238 | .saddr = dst, | |
239 | .tos = tos } }, | |
b0c110ca | 240 | .mark = mark, |
1da177e4 | 241 | .iif = oif }; |
b0c110ca | 242 | |
1da177e4 | 243 | struct fib_result res; |
8153a10c | 244 | int no_addr, rpf, accept_local; |
1da177e4 | 245 | int ret; |
5b707aaa | 246 | struct net *net; |
1da177e4 | 247 | |
8153a10c | 248 | no_addr = rpf = accept_local = 0; |
1da177e4 | 249 | rcu_read_lock(); |
e5ed6399 | 250 | in_dev = __in_dev_get_rcu(dev); |
1da177e4 LT |
251 | if (in_dev) { |
252 | no_addr = in_dev->ifa_list == NULL; | |
253 | rpf = IN_DEV_RPFILTER(in_dev); | |
8153a10c | 254 | accept_local = IN_DEV_ACCEPT_LOCAL(in_dev); |
28f6aeea JHS |
255 | if (mark && !IN_DEV_SRC_VMARK(in_dev)) |
256 | fl.mark = 0; | |
1da177e4 LT |
257 | } |
258 | rcu_read_unlock(); | |
259 | ||
260 | if (in_dev == NULL) | |
261 | goto e_inval; | |
262 | ||
c346dca1 | 263 | net = dev_net(dev); |
5b707aaa | 264 | if (fib_lookup(net, &fl, &res)) |
1da177e4 | 265 | goto last_resort; |
8153a10c PM |
266 | if (res.type != RTN_UNICAST) { |
267 | if (res.type != RTN_LOCAL || !accept_local) | |
268 | goto e_inval_res; | |
269 | } | |
1da177e4 LT |
270 | *spec_dst = FIB_RES_PREFSRC(res); |
271 | fib_combine_itag(itag, &res); | |
272 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
273 | if (FIB_RES_DEV(res) == dev || res.fi->fib_nhs > 1) | |
274 | #else | |
275 | if (FIB_RES_DEV(res) == dev) | |
276 | #endif | |
277 | { | |
278 | ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST; | |
279 | fib_res_put(&res); | |
280 | return ret; | |
281 | } | |
282 | fib_res_put(&res); | |
283 | if (no_addr) | |
284 | goto last_resort; | |
c1cf8422 | 285 | if (rpf == 1) |
1da177e4 LT |
286 | goto e_inval; |
287 | fl.oif = dev->ifindex; | |
288 | ||
289 | ret = 0; | |
5b707aaa | 290 | if (fib_lookup(net, &fl, &res) == 0) { |
1da177e4 LT |
291 | if (res.type == RTN_UNICAST) { |
292 | *spec_dst = FIB_RES_PREFSRC(res); | |
293 | ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST; | |
294 | } | |
295 | fib_res_put(&res); | |
296 | } | |
297 | return ret; | |
298 | ||
299 | last_resort: | |
300 | if (rpf) | |
301 | goto e_inval; | |
302 | *spec_dst = inet_select_addr(dev, 0, RT_SCOPE_UNIVERSE); | |
303 | *itag = 0; | |
304 | return 0; | |
305 | ||
306 | e_inval_res: | |
307 | fib_res_put(&res); | |
308 | e_inval: | |
309 | return -EINVAL; | |
310 | } | |
311 | ||
81f7bf6c | 312 | static inline __be32 sk_extract_addr(struct sockaddr *addr) |
4e902c57 TG |
313 | { |
314 | return ((struct sockaddr_in *) addr)->sin_addr.s_addr; | |
315 | } | |
316 | ||
317 | static int put_rtax(struct nlattr *mx, int len, int type, u32 value) | |
318 | { | |
319 | struct nlattr *nla; | |
320 | ||
321 | nla = (struct nlattr *) ((char *) mx + len); | |
322 | nla->nla_type = type; | |
323 | nla->nla_len = nla_attr_size(4); | |
324 | *(u32 *) nla_data(nla) = value; | |
325 | ||
326 | return len + nla_total_size(4); | |
327 | } | |
328 | ||
4b5d47d4 | 329 | static int rtentry_to_fib_config(struct net *net, int cmd, struct rtentry *rt, |
4e902c57 TG |
330 | struct fib_config *cfg) |
331 | { | |
6d85c10a | 332 | __be32 addr; |
4e902c57 TG |
333 | int plen; |
334 | ||
335 | memset(cfg, 0, sizeof(*cfg)); | |
4b5d47d4 | 336 | cfg->fc_nlinfo.nl_net = net; |
4e902c57 TG |
337 | |
338 | if (rt->rt_dst.sa_family != AF_INET) | |
339 | return -EAFNOSUPPORT; | |
340 | ||
341 | /* | |
342 | * Check mask for validity: | |
343 | * a) it must be contiguous. | |
344 | * b) destination must have all host bits clear. | |
345 | * c) if application forgot to set correct family (AF_INET), | |
346 | * reject request unless it is absolutely clear i.e. | |
347 | * both family and mask are zero. | |
348 | */ | |
349 | plen = 32; | |
350 | addr = sk_extract_addr(&rt->rt_dst); | |
351 | if (!(rt->rt_flags & RTF_HOST)) { | |
81f7bf6c | 352 | __be32 mask = sk_extract_addr(&rt->rt_genmask); |
4e902c57 TG |
353 | |
354 | if (rt->rt_genmask.sa_family != AF_INET) { | |
355 | if (mask || rt->rt_genmask.sa_family) | |
356 | return -EAFNOSUPPORT; | |
357 | } | |
358 | ||
359 | if (bad_mask(mask, addr)) | |
360 | return -EINVAL; | |
361 | ||
362 | plen = inet_mask_len(mask); | |
363 | } | |
364 | ||
365 | cfg->fc_dst_len = plen; | |
366 | cfg->fc_dst = addr; | |
367 | ||
368 | if (cmd != SIOCDELRT) { | |
369 | cfg->fc_nlflags = NLM_F_CREATE; | |
370 | cfg->fc_protocol = RTPROT_BOOT; | |
371 | } | |
372 | ||
373 | if (rt->rt_metric) | |
374 | cfg->fc_priority = rt->rt_metric - 1; | |
375 | ||
376 | if (rt->rt_flags & RTF_REJECT) { | |
377 | cfg->fc_scope = RT_SCOPE_HOST; | |
378 | cfg->fc_type = RTN_UNREACHABLE; | |
379 | return 0; | |
380 | } | |
381 | ||
382 | cfg->fc_scope = RT_SCOPE_NOWHERE; | |
383 | cfg->fc_type = RTN_UNICAST; | |
384 | ||
385 | if (rt->rt_dev) { | |
386 | char *colon; | |
387 | struct net_device *dev; | |
388 | char devname[IFNAMSIZ]; | |
389 | ||
390 | if (copy_from_user(devname, rt->rt_dev, IFNAMSIZ-1)) | |
391 | return -EFAULT; | |
392 | ||
393 | devname[IFNAMSIZ-1] = 0; | |
394 | colon = strchr(devname, ':'); | |
395 | if (colon) | |
396 | *colon = 0; | |
4b5d47d4 | 397 | dev = __dev_get_by_name(net, devname); |
4e902c57 TG |
398 | if (!dev) |
399 | return -ENODEV; | |
400 | cfg->fc_oif = dev->ifindex; | |
401 | if (colon) { | |
402 | struct in_ifaddr *ifa; | |
403 | struct in_device *in_dev = __in_dev_get_rtnl(dev); | |
404 | if (!in_dev) | |
405 | return -ENODEV; | |
406 | *colon = ':'; | |
407 | for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) | |
408 | if (strcmp(ifa->ifa_label, devname) == 0) | |
409 | break; | |
410 | if (ifa == NULL) | |
411 | return -ENODEV; | |
412 | cfg->fc_prefsrc = ifa->ifa_local; | |
413 | } | |
414 | } | |
415 | ||
416 | addr = sk_extract_addr(&rt->rt_gateway); | |
417 | if (rt->rt_gateway.sa_family == AF_INET && addr) { | |
418 | cfg->fc_gw = addr; | |
419 | if (rt->rt_flags & RTF_GATEWAY && | |
4b5d47d4 | 420 | inet_addr_type(net, addr) == RTN_UNICAST) |
4e902c57 TG |
421 | cfg->fc_scope = RT_SCOPE_UNIVERSE; |
422 | } | |
423 | ||
424 | if (cmd == SIOCDELRT) | |
425 | return 0; | |
426 | ||
427 | if (rt->rt_flags & RTF_GATEWAY && !cfg->fc_gw) | |
428 | return -EINVAL; | |
429 | ||
430 | if (cfg->fc_scope == RT_SCOPE_NOWHERE) | |
431 | cfg->fc_scope = RT_SCOPE_LINK; | |
432 | ||
433 | if (rt->rt_flags & (RTF_MTU | RTF_WINDOW | RTF_IRTT)) { | |
434 | struct nlattr *mx; | |
435 | int len = 0; | |
436 | ||
437 | mx = kzalloc(3 * nla_total_size(4), GFP_KERNEL); | |
e905a9ed | 438 | if (mx == NULL) |
4e902c57 TG |
439 | return -ENOMEM; |
440 | ||
441 | if (rt->rt_flags & RTF_MTU) | |
442 | len = put_rtax(mx, len, RTAX_ADVMSS, rt->rt_mtu - 40); | |
443 | ||
444 | if (rt->rt_flags & RTF_WINDOW) | |
445 | len = put_rtax(mx, len, RTAX_WINDOW, rt->rt_window); | |
446 | ||
447 | if (rt->rt_flags & RTF_IRTT) | |
448 | len = put_rtax(mx, len, RTAX_RTT, rt->rt_irtt << 3); | |
449 | ||
450 | cfg->fc_mx = mx; | |
451 | cfg->fc_mx_len = len; | |
452 | } | |
453 | ||
454 | return 0; | |
455 | } | |
456 | ||
1da177e4 LT |
457 | /* |
458 | * Handle IP routing ioctl calls. These are used to manipulate the routing tables | |
459 | */ | |
e905a9ed | 460 | |
1bad118a | 461 | int ip_rt_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
1da177e4 | 462 | { |
4e902c57 TG |
463 | struct fib_config cfg; |
464 | struct rtentry rt; | |
1da177e4 | 465 | int err; |
1da177e4 LT |
466 | |
467 | switch (cmd) { | |
468 | case SIOCADDRT: /* Add a route */ | |
469 | case SIOCDELRT: /* Delete a route */ | |
470 | if (!capable(CAP_NET_ADMIN)) | |
471 | return -EPERM; | |
4e902c57 TG |
472 | |
473 | if (copy_from_user(&rt, arg, sizeof(rt))) | |
1da177e4 | 474 | return -EFAULT; |
4e902c57 | 475 | |
1da177e4 | 476 | rtnl_lock(); |
1bad118a | 477 | err = rtentry_to_fib_config(net, cmd, &rt, &cfg); |
1da177e4 | 478 | if (err == 0) { |
4e902c57 TG |
479 | struct fib_table *tb; |
480 | ||
1da177e4 | 481 | if (cmd == SIOCDELRT) { |
1bad118a | 482 | tb = fib_get_table(net, cfg.fc_table); |
1da177e4 | 483 | if (tb) |
16c6cf8b | 484 | err = fib_table_delete(tb, &cfg); |
4e902c57 TG |
485 | else |
486 | err = -ESRCH; | |
1da177e4 | 487 | } else { |
1bad118a | 488 | tb = fib_new_table(net, cfg.fc_table); |
1da177e4 | 489 | if (tb) |
16c6cf8b | 490 | err = fib_table_insert(tb, &cfg); |
4e902c57 TG |
491 | else |
492 | err = -ENOBUFS; | |
1da177e4 | 493 | } |
4e902c57 TG |
494 | |
495 | /* allocated by rtentry_to_fib_config() */ | |
496 | kfree(cfg.fc_mx); | |
1da177e4 LT |
497 | } |
498 | rtnl_unlock(); | |
499 | return err; | |
500 | } | |
501 | return -EINVAL; | |
502 | } | |
503 | ||
ef7c79ed | 504 | const struct nla_policy rtm_ipv4_policy[RTA_MAX+1] = { |
4e902c57 TG |
505 | [RTA_DST] = { .type = NLA_U32 }, |
506 | [RTA_SRC] = { .type = NLA_U32 }, | |
507 | [RTA_IIF] = { .type = NLA_U32 }, | |
508 | [RTA_OIF] = { .type = NLA_U32 }, | |
509 | [RTA_GATEWAY] = { .type = NLA_U32 }, | |
510 | [RTA_PRIORITY] = { .type = NLA_U32 }, | |
511 | [RTA_PREFSRC] = { .type = NLA_U32 }, | |
512 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
5176f91e | 513 | [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) }, |
4e902c57 | 514 | [RTA_FLOW] = { .type = NLA_U32 }, |
4e902c57 TG |
515 | }; |
516 | ||
4b5d47d4 DL |
517 | static int rtm_to_fib_config(struct net *net, struct sk_buff *skb, |
518 | struct nlmsghdr *nlh, struct fib_config *cfg) | |
1da177e4 | 519 | { |
4e902c57 TG |
520 | struct nlattr *attr; |
521 | int err, remaining; | |
522 | struct rtmsg *rtm; | |
523 | ||
524 | err = nlmsg_validate(nlh, sizeof(*rtm), RTA_MAX, rtm_ipv4_policy); | |
525 | if (err < 0) | |
526 | goto errout; | |
527 | ||
528 | memset(cfg, 0, sizeof(*cfg)); | |
529 | ||
530 | rtm = nlmsg_data(nlh); | |
4e902c57 | 531 | cfg->fc_dst_len = rtm->rtm_dst_len; |
4e902c57 TG |
532 | cfg->fc_tos = rtm->rtm_tos; |
533 | cfg->fc_table = rtm->rtm_table; | |
534 | cfg->fc_protocol = rtm->rtm_protocol; | |
535 | cfg->fc_scope = rtm->rtm_scope; | |
536 | cfg->fc_type = rtm->rtm_type; | |
537 | cfg->fc_flags = rtm->rtm_flags; | |
538 | cfg->fc_nlflags = nlh->nlmsg_flags; | |
539 | ||
540 | cfg->fc_nlinfo.pid = NETLINK_CB(skb).pid; | |
541 | cfg->fc_nlinfo.nlh = nlh; | |
4b5d47d4 | 542 | cfg->fc_nlinfo.nl_net = net; |
4e902c57 | 543 | |
a0ee18b9 TG |
544 | if (cfg->fc_type > RTN_MAX) { |
545 | err = -EINVAL; | |
546 | goto errout; | |
547 | } | |
548 | ||
4e902c57 | 549 | nlmsg_for_each_attr(attr, nlh, sizeof(struct rtmsg), remaining) { |
8f4c1f9b | 550 | switch (nla_type(attr)) { |
4e902c57 | 551 | case RTA_DST: |
17fb2c64 | 552 | cfg->fc_dst = nla_get_be32(attr); |
4e902c57 | 553 | break; |
4e902c57 TG |
554 | case RTA_OIF: |
555 | cfg->fc_oif = nla_get_u32(attr); | |
556 | break; | |
557 | case RTA_GATEWAY: | |
17fb2c64 | 558 | cfg->fc_gw = nla_get_be32(attr); |
4e902c57 TG |
559 | break; |
560 | case RTA_PRIORITY: | |
561 | cfg->fc_priority = nla_get_u32(attr); | |
562 | break; | |
563 | case RTA_PREFSRC: | |
17fb2c64 | 564 | cfg->fc_prefsrc = nla_get_be32(attr); |
4e902c57 TG |
565 | break; |
566 | case RTA_METRICS: | |
567 | cfg->fc_mx = nla_data(attr); | |
568 | cfg->fc_mx_len = nla_len(attr); | |
569 | break; | |
570 | case RTA_MULTIPATH: | |
571 | cfg->fc_mp = nla_data(attr); | |
572 | cfg->fc_mp_len = nla_len(attr); | |
573 | break; | |
574 | case RTA_FLOW: | |
575 | cfg->fc_flow = nla_get_u32(attr); | |
576 | break; | |
4e902c57 TG |
577 | case RTA_TABLE: |
578 | cfg->fc_table = nla_get_u32(attr); | |
579 | break; | |
1da177e4 LT |
580 | } |
581 | } | |
4e902c57 | 582 | |
1da177e4 | 583 | return 0; |
4e902c57 TG |
584 | errout: |
585 | return err; | |
1da177e4 LT |
586 | } |
587 | ||
6ed2533e | 588 | static int inet_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) |
1da177e4 | 589 | { |
3b1e0a65 | 590 | struct net *net = sock_net(skb->sk); |
4e902c57 TG |
591 | struct fib_config cfg; |
592 | struct fib_table *tb; | |
593 | int err; | |
1da177e4 | 594 | |
4b5d47d4 | 595 | err = rtm_to_fib_config(net, skb, nlh, &cfg); |
4e902c57 TG |
596 | if (err < 0) |
597 | goto errout; | |
1da177e4 | 598 | |
8ad4942c | 599 | tb = fib_get_table(net, cfg.fc_table); |
4e902c57 TG |
600 | if (tb == NULL) { |
601 | err = -ESRCH; | |
602 | goto errout; | |
603 | } | |
604 | ||
16c6cf8b | 605 | err = fib_table_delete(tb, &cfg); |
4e902c57 TG |
606 | errout: |
607 | return err; | |
1da177e4 LT |
608 | } |
609 | ||
6ed2533e | 610 | static int inet_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) |
1da177e4 | 611 | { |
3b1e0a65 | 612 | struct net *net = sock_net(skb->sk); |
4e902c57 TG |
613 | struct fib_config cfg; |
614 | struct fib_table *tb; | |
615 | int err; | |
1da177e4 | 616 | |
4b5d47d4 | 617 | err = rtm_to_fib_config(net, skb, nlh, &cfg); |
4e902c57 TG |
618 | if (err < 0) |
619 | goto errout; | |
1da177e4 | 620 | |
226b0b4a | 621 | tb = fib_new_table(net, cfg.fc_table); |
4e902c57 TG |
622 | if (tb == NULL) { |
623 | err = -ENOBUFS; | |
624 | goto errout; | |
625 | } | |
626 | ||
16c6cf8b | 627 | err = fib_table_insert(tb, &cfg); |
4e902c57 TG |
628 | errout: |
629 | return err; | |
1da177e4 LT |
630 | } |
631 | ||
63f3444f | 632 | static int inet_dump_fib(struct sk_buff *skb, struct netlink_callback *cb) |
1da177e4 | 633 | { |
3b1e0a65 | 634 | struct net *net = sock_net(skb->sk); |
1af5a8c4 PM |
635 | unsigned int h, s_h; |
636 | unsigned int e = 0, s_e; | |
1da177e4 | 637 | struct fib_table *tb; |
1af5a8c4 | 638 | struct hlist_node *node; |
e4aef8ae | 639 | struct hlist_head *head; |
1af5a8c4 | 640 | int dumped = 0; |
1da177e4 | 641 | |
be403ea1 TG |
642 | if (nlmsg_len(cb->nlh) >= sizeof(struct rtmsg) && |
643 | ((struct rtmsg *) nlmsg_data(cb->nlh))->rtm_flags & RTM_F_CLONED) | |
1da177e4 LT |
644 | return ip_rt_dump(skb, cb); |
645 | ||
1af5a8c4 PM |
646 | s_h = cb->args[0]; |
647 | s_e = cb->args[1]; | |
648 | ||
649 | for (h = s_h; h < FIB_TABLE_HASHSZ; h++, s_e = 0) { | |
650 | e = 0; | |
e4aef8ae DL |
651 | head = &net->ipv4.fib_table_hash[h]; |
652 | hlist_for_each_entry(tb, node, head, tb_hlist) { | |
1af5a8c4 PM |
653 | if (e < s_e) |
654 | goto next; | |
655 | if (dumped) | |
656 | memset(&cb->args[2], 0, sizeof(cb->args) - | |
e905a9ed | 657 | 2 * sizeof(cb->args[0])); |
16c6cf8b | 658 | if (fib_table_dump(tb, skb, cb) < 0) |
1af5a8c4 PM |
659 | goto out; |
660 | dumped = 1; | |
661 | next: | |
662 | e++; | |
663 | } | |
1da177e4 | 664 | } |
1af5a8c4 PM |
665 | out: |
666 | cb->args[1] = e; | |
667 | cb->args[0] = h; | |
1da177e4 LT |
668 | |
669 | return skb->len; | |
670 | } | |
671 | ||
672 | /* Prepare and feed intra-kernel routing request. | |
673 | Really, it should be netlink message, but :-( netlink | |
674 | can be not configured, so that we feed it directly | |
675 | to fib engine. It is legal, because all events occur | |
676 | only when netlink is already locked. | |
677 | */ | |
678 | ||
81f7bf6c | 679 | static void fib_magic(int cmd, int type, __be32 dst, int dst_len, struct in_ifaddr *ifa) |
1da177e4 | 680 | { |
c346dca1 | 681 | struct net *net = dev_net(ifa->ifa_dev->dev); |
4e902c57 TG |
682 | struct fib_table *tb; |
683 | struct fib_config cfg = { | |
684 | .fc_protocol = RTPROT_KERNEL, | |
685 | .fc_type = type, | |
686 | .fc_dst = dst, | |
687 | .fc_dst_len = dst_len, | |
688 | .fc_prefsrc = ifa->ifa_local, | |
689 | .fc_oif = ifa->ifa_dev->dev->ifindex, | |
690 | .fc_nlflags = NLM_F_CREATE | NLM_F_APPEND, | |
4d1169c1 | 691 | .fc_nlinfo = { |
4b5d47d4 | 692 | .nl_net = net, |
4d1169c1 | 693 | }, |
4e902c57 | 694 | }; |
1da177e4 LT |
695 | |
696 | if (type == RTN_UNICAST) | |
4b5d47d4 | 697 | tb = fib_new_table(net, RT_TABLE_MAIN); |
1da177e4 | 698 | else |
4b5d47d4 | 699 | tb = fib_new_table(net, RT_TABLE_LOCAL); |
1da177e4 LT |
700 | |
701 | if (tb == NULL) | |
702 | return; | |
703 | ||
4e902c57 | 704 | cfg.fc_table = tb->tb_id; |
1da177e4 | 705 | |
4e902c57 TG |
706 | if (type != RTN_LOCAL) |
707 | cfg.fc_scope = RT_SCOPE_LINK; | |
708 | else | |
709 | cfg.fc_scope = RT_SCOPE_HOST; | |
1da177e4 LT |
710 | |
711 | if (cmd == RTM_NEWROUTE) | |
16c6cf8b | 712 | fib_table_insert(tb, &cfg); |
1da177e4 | 713 | else |
16c6cf8b | 714 | fib_table_delete(tb, &cfg); |
1da177e4 LT |
715 | } |
716 | ||
0ff60a45 | 717 | void fib_add_ifaddr(struct in_ifaddr *ifa) |
1da177e4 LT |
718 | { |
719 | struct in_device *in_dev = ifa->ifa_dev; | |
720 | struct net_device *dev = in_dev->dev; | |
721 | struct in_ifaddr *prim = ifa; | |
a144ea4b AV |
722 | __be32 mask = ifa->ifa_mask; |
723 | __be32 addr = ifa->ifa_local; | |
724 | __be32 prefix = ifa->ifa_address&mask; | |
1da177e4 LT |
725 | |
726 | if (ifa->ifa_flags&IFA_F_SECONDARY) { | |
727 | prim = inet_ifa_byprefix(in_dev, prefix, mask); | |
728 | if (prim == NULL) { | |
a6db9010 | 729 | printk(KERN_WARNING "fib_add_ifaddr: bug: prim == NULL\n"); |
1da177e4 LT |
730 | return; |
731 | } | |
732 | } | |
733 | ||
734 | fib_magic(RTM_NEWROUTE, RTN_LOCAL, addr, 32, prim); | |
735 | ||
736 | if (!(dev->flags&IFF_UP)) | |
737 | return; | |
738 | ||
739 | /* Add broadcast address, if it is explicitly assigned. */ | |
a144ea4b | 740 | if (ifa->ifa_broadcast && ifa->ifa_broadcast != htonl(0xFFFFFFFF)) |
1da177e4 LT |
741 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim); |
742 | ||
f97c1e0c | 743 | if (!ipv4_is_zeronet(prefix) && !(ifa->ifa_flags&IFA_F_SECONDARY) && |
1da177e4 LT |
744 | (prefix != addr || ifa->ifa_prefixlen < 32)) { |
745 | fib_magic(RTM_NEWROUTE, dev->flags&IFF_LOOPBACK ? RTN_LOCAL : | |
746 | RTN_UNICAST, prefix, ifa->ifa_prefixlen, prim); | |
747 | ||
748 | /* Add network specific broadcasts, when it takes a sense */ | |
749 | if (ifa->ifa_prefixlen < 31) { | |
750 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix, 32, prim); | |
751 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix|~mask, 32, prim); | |
752 | } | |
753 | } | |
754 | } | |
755 | ||
756 | static void fib_del_ifaddr(struct in_ifaddr *ifa) | |
757 | { | |
758 | struct in_device *in_dev = ifa->ifa_dev; | |
759 | struct net_device *dev = in_dev->dev; | |
760 | struct in_ifaddr *ifa1; | |
761 | struct in_ifaddr *prim = ifa; | |
a144ea4b AV |
762 | __be32 brd = ifa->ifa_address|~ifa->ifa_mask; |
763 | __be32 any = ifa->ifa_address&ifa->ifa_mask; | |
1da177e4 LT |
764 | #define LOCAL_OK 1 |
765 | #define BRD_OK 2 | |
766 | #define BRD0_OK 4 | |
767 | #define BRD1_OK 8 | |
768 | unsigned ok = 0; | |
769 | ||
770 | if (!(ifa->ifa_flags&IFA_F_SECONDARY)) | |
771 | fib_magic(RTM_DELROUTE, dev->flags&IFF_LOOPBACK ? RTN_LOCAL : | |
772 | RTN_UNICAST, any, ifa->ifa_prefixlen, prim); | |
773 | else { | |
774 | prim = inet_ifa_byprefix(in_dev, any, ifa->ifa_mask); | |
775 | if (prim == NULL) { | |
a6db9010 | 776 | printk(KERN_WARNING "fib_del_ifaddr: bug: prim == NULL\n"); |
1da177e4 LT |
777 | return; |
778 | } | |
779 | } | |
780 | ||
781 | /* Deletion is more complicated than add. | |
782 | We should take care of not to delete too much :-) | |
783 | ||
784 | Scan address list to be sure that addresses are really gone. | |
785 | */ | |
786 | ||
787 | for (ifa1 = in_dev->ifa_list; ifa1; ifa1 = ifa1->ifa_next) { | |
788 | if (ifa->ifa_local == ifa1->ifa_local) | |
789 | ok |= LOCAL_OK; | |
790 | if (ifa->ifa_broadcast == ifa1->ifa_broadcast) | |
791 | ok |= BRD_OK; | |
792 | if (brd == ifa1->ifa_broadcast) | |
793 | ok |= BRD1_OK; | |
794 | if (any == ifa1->ifa_broadcast) | |
795 | ok |= BRD0_OK; | |
796 | } | |
797 | ||
798 | if (!(ok&BRD_OK)) | |
799 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim); | |
800 | if (!(ok&BRD1_OK)) | |
801 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, brd, 32, prim); | |
802 | if (!(ok&BRD0_OK)) | |
803 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, any, 32, prim); | |
804 | if (!(ok&LOCAL_OK)) { | |
805 | fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 32, prim); | |
806 | ||
807 | /* Check, that this local address finally disappeared. */ | |
c346dca1 | 808 | if (inet_addr_type(dev_net(dev), ifa->ifa_local) != RTN_LOCAL) { |
1da177e4 LT |
809 | /* And the last, but not the least thing. |
810 | We must flush stray FIB entries. | |
811 | ||
812 | First of all, we scan fib_info list searching | |
813 | for stray nexthop entries, then ignite fib_flush. | |
814 | */ | |
c346dca1 YH |
815 | if (fib_sync_down_addr(dev_net(dev), ifa->ifa_local)) |
816 | fib_flush(dev_net(dev)); | |
1da177e4 LT |
817 | } |
818 | } | |
819 | #undef LOCAL_OK | |
820 | #undef BRD_OK | |
821 | #undef BRD0_OK | |
822 | #undef BRD1_OK | |
823 | } | |
824 | ||
246955fe RO |
825 | static void nl_fib_lookup(struct fib_result_nl *frn, struct fib_table *tb ) |
826 | { | |
e905a9ed | 827 | |
246955fe | 828 | struct fib_result res; |
5f300893 | 829 | struct flowi fl = { .mark = frn->fl_mark, |
47dcf0cb | 830 | .nl_u = { .ip4_u = { .daddr = frn->fl_addr, |
246955fe RO |
831 | .tos = frn->fl_tos, |
832 | .scope = frn->fl_scope } } }; | |
1194ed0a | 833 | |
912a41a4 SV |
834 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
835 | res.r = NULL; | |
836 | #endif | |
837 | ||
1194ed0a | 838 | frn->err = -ENOENT; |
246955fe RO |
839 | if (tb) { |
840 | local_bh_disable(); | |
841 | ||
842 | frn->tb_id = tb->tb_id; | |
16c6cf8b | 843 | frn->err = fib_table_lookup(tb, &fl, &res); |
246955fe RO |
844 | |
845 | if (!frn->err) { | |
846 | frn->prefixlen = res.prefixlen; | |
847 | frn->nh_sel = res.nh_sel; | |
848 | frn->type = res.type; | |
849 | frn->scope = res.scope; | |
1194ed0a | 850 | fib_res_put(&res); |
246955fe RO |
851 | } |
852 | local_bh_enable(); | |
853 | } | |
854 | } | |
855 | ||
28f7b036 | 856 | static void nl_fib_input(struct sk_buff *skb) |
246955fe | 857 | { |
6bd48fcf | 858 | struct net *net; |
246955fe | 859 | struct fib_result_nl *frn; |
28f7b036 | 860 | struct nlmsghdr *nlh; |
246955fe | 861 | struct fib_table *tb; |
28f7b036 | 862 | u32 pid; |
1194ed0a | 863 | |
3b1e0a65 | 864 | net = sock_net(skb->sk); |
b529ccf2 | 865 | nlh = nlmsg_hdr(skb); |
ea86575e | 866 | if (skb->len < NLMSG_SPACE(0) || skb->len < nlh->nlmsg_len || |
d883a036 | 867 | nlh->nlmsg_len < NLMSG_LENGTH(sizeof(*frn))) |
ea86575e | 868 | return; |
d883a036 DL |
869 | |
870 | skb = skb_clone(skb, GFP_KERNEL); | |
871 | if (skb == NULL) | |
872 | return; | |
873 | nlh = nlmsg_hdr(skb); | |
e905a9ed | 874 | |
246955fe | 875 | frn = (struct fib_result_nl *) NLMSG_DATA(nlh); |
6bd48fcf | 876 | tb = fib_get_table(net, frn->tb_id_in); |
246955fe RO |
877 | |
878 | nl_fib_lookup(frn, tb); | |
e905a9ed | 879 | |
1194ed0a | 880 | pid = NETLINK_CB(skb).pid; /* pid of sending process */ |
246955fe | 881 | NETLINK_CB(skb).pid = 0; /* from kernel */ |
ac6d439d | 882 | NETLINK_CB(skb).dst_group = 0; /* unicast */ |
6bd48fcf | 883 | netlink_unicast(net->ipv4.fibnl, skb, pid, MSG_DONTWAIT); |
e905a9ed | 884 | } |
246955fe | 885 | |
7b1a74fd | 886 | static int nl_fib_lookup_init(struct net *net) |
246955fe | 887 | { |
6bd48fcf DL |
888 | struct sock *sk; |
889 | sk = netlink_kernel_create(net, NETLINK_FIB_LOOKUP, 0, | |
890 | nl_fib_input, NULL, THIS_MODULE); | |
891 | if (sk == NULL) | |
7b1a74fd | 892 | return -EAFNOSUPPORT; |
6bd48fcf | 893 | net->ipv4.fibnl = sk; |
7b1a74fd DL |
894 | return 0; |
895 | } | |
896 | ||
897 | static void nl_fib_lookup_exit(struct net *net) | |
898 | { | |
b7c6ba6e | 899 | netlink_kernel_release(net->ipv4.fibnl); |
775516bf | 900 | net->ipv4.fibnl = NULL; |
246955fe RO |
901 | } |
902 | ||
e2ce1468 | 903 | static void fib_disable_ip(struct net_device *dev, int force, int delay) |
1da177e4 | 904 | { |
85326fa5 | 905 | if (fib_sync_down_dev(dev, force)) |
c346dca1 | 906 | fib_flush(dev_net(dev)); |
e2ce1468 | 907 | rt_cache_flush(dev_net(dev), delay); |
1da177e4 LT |
908 | arp_ifdown(dev); |
909 | } | |
910 | ||
911 | static int fib_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr) | |
912 | { | |
6ed2533e | 913 | struct in_ifaddr *ifa = (struct in_ifaddr *)ptr; |
76e6ebfb | 914 | struct net_device *dev = ifa->ifa_dev->dev; |
1da177e4 LT |
915 | |
916 | switch (event) { | |
917 | case NETDEV_UP: | |
918 | fib_add_ifaddr(ifa); | |
919 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
76e6ebfb | 920 | fib_sync_up(dev); |
1da177e4 | 921 | #endif |
76e6ebfb | 922 | rt_cache_flush(dev_net(dev), -1); |
1da177e4 LT |
923 | break; |
924 | case NETDEV_DOWN: | |
925 | fib_del_ifaddr(ifa); | |
9fcc2e8a | 926 | if (ifa->ifa_dev->ifa_list == NULL) { |
1da177e4 LT |
927 | /* Last address was deleted from this interface. |
928 | Disable IP. | |
929 | */ | |
e2ce1468 | 930 | fib_disable_ip(dev, 1, 0); |
1da177e4 | 931 | } else { |
76e6ebfb | 932 | rt_cache_flush(dev_net(dev), -1); |
1da177e4 LT |
933 | } |
934 | break; | |
935 | } | |
936 | return NOTIFY_DONE; | |
937 | } | |
938 | ||
939 | static int fib_netdev_event(struct notifier_block *this, unsigned long event, void *ptr) | |
940 | { | |
941 | struct net_device *dev = ptr; | |
e5ed6399 | 942 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
1da177e4 LT |
943 | |
944 | if (event == NETDEV_UNREGISTER) { | |
e2ce1468 | 945 | fib_disable_ip(dev, 2, -1); |
1da177e4 LT |
946 | return NOTIFY_DONE; |
947 | } | |
948 | ||
949 | if (!in_dev) | |
950 | return NOTIFY_DONE; | |
951 | ||
952 | switch (event) { | |
953 | case NETDEV_UP: | |
954 | for_ifa(in_dev) { | |
955 | fib_add_ifaddr(ifa); | |
956 | } endfor_ifa(in_dev); | |
957 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
958 | fib_sync_up(dev); | |
959 | #endif | |
76e6ebfb | 960 | rt_cache_flush(dev_net(dev), -1); |
1da177e4 LT |
961 | break; |
962 | case NETDEV_DOWN: | |
e2ce1468 | 963 | fib_disable_ip(dev, 0, 0); |
1da177e4 LT |
964 | break; |
965 | case NETDEV_CHANGEMTU: | |
966 | case NETDEV_CHANGE: | |
76e6ebfb | 967 | rt_cache_flush(dev_net(dev), 0); |
1da177e4 | 968 | break; |
a5ee1551 EB |
969 | case NETDEV_UNREGISTER_BATCH: |
970 | rt_cache_flush_batch(); | |
971 | break; | |
1da177e4 LT |
972 | } |
973 | return NOTIFY_DONE; | |
974 | } | |
975 | ||
976 | static struct notifier_block fib_inetaddr_notifier = { | |
6ed2533e | 977 | .notifier_call = fib_inetaddr_event, |
1da177e4 LT |
978 | }; |
979 | ||
980 | static struct notifier_block fib_netdev_notifier = { | |
6ed2533e | 981 | .notifier_call = fib_netdev_event, |
1da177e4 LT |
982 | }; |
983 | ||
7b1a74fd | 984 | static int __net_init ip_fib_net_init(struct net *net) |
1da177e4 | 985 | { |
dce5cbee | 986 | int err; |
1af5a8c4 PM |
987 | unsigned int i; |
988 | ||
e4aef8ae DL |
989 | net->ipv4.fib_table_hash = kzalloc( |
990 | sizeof(struct hlist_head)*FIB_TABLE_HASHSZ, GFP_KERNEL); | |
991 | if (net->ipv4.fib_table_hash == NULL) | |
992 | return -ENOMEM; | |
993 | ||
1af5a8c4 | 994 | for (i = 0; i < FIB_TABLE_HASHSZ; i++) |
e4aef8ae | 995 | INIT_HLIST_HEAD(&net->ipv4.fib_table_hash[i]); |
c3e9a353 | 996 | |
dce5cbee DL |
997 | err = fib4_rules_init(net); |
998 | if (err < 0) | |
999 | goto fail; | |
1000 | return 0; | |
1001 | ||
1002 | fail: | |
1003 | kfree(net->ipv4.fib_table_hash); | |
1004 | return err; | |
7b1a74fd | 1005 | } |
1da177e4 | 1006 | |
7b1a74fd DL |
1007 | static void __net_exit ip_fib_net_exit(struct net *net) |
1008 | { | |
1009 | unsigned int i; | |
1010 | ||
1011 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
1012 | fib4_rules_exit(net); | |
1013 | #endif | |
1014 | ||
1015 | for (i = 0; i < FIB_TABLE_HASHSZ; i++) { | |
1016 | struct fib_table *tb; | |
1017 | struct hlist_head *head; | |
1018 | struct hlist_node *node, *tmp; | |
63f3444f | 1019 | |
e4aef8ae | 1020 | head = &net->ipv4.fib_table_hash[i]; |
7b1a74fd DL |
1021 | hlist_for_each_entry_safe(tb, node, tmp, head, tb_hlist) { |
1022 | hlist_del(node); | |
16c6cf8b | 1023 | fib_table_flush(tb); |
7b1a74fd DL |
1024 | kfree(tb); |
1025 | } | |
1026 | } | |
e4aef8ae | 1027 | kfree(net->ipv4.fib_table_hash); |
7b1a74fd DL |
1028 | } |
1029 | ||
1030 | static int __net_init fib_net_init(struct net *net) | |
1031 | { | |
1032 | int error; | |
1033 | ||
7b1a74fd DL |
1034 | error = ip_fib_net_init(net); |
1035 | if (error < 0) | |
1036 | goto out; | |
1037 | error = nl_fib_lookup_init(net); | |
1038 | if (error < 0) | |
1039 | goto out_nlfl; | |
1040 | error = fib_proc_init(net); | |
1041 | if (error < 0) | |
1042 | goto out_proc; | |
1043 | out: | |
1044 | return error; | |
1045 | ||
1046 | out_proc: | |
1047 | nl_fib_lookup_exit(net); | |
1048 | out_nlfl: | |
1049 | ip_fib_net_exit(net); | |
1050 | goto out; | |
1051 | } | |
1052 | ||
1053 | static void __net_exit fib_net_exit(struct net *net) | |
1054 | { | |
1055 | fib_proc_exit(net); | |
1056 | nl_fib_lookup_exit(net); | |
1057 | ip_fib_net_exit(net); | |
1058 | } | |
1059 | ||
1060 | static struct pernet_operations fib_net_ops = { | |
1061 | .init = fib_net_init, | |
1062 | .exit = fib_net_exit, | |
1063 | }; | |
1064 | ||
1065 | void __init ip_fib_init(void) | |
1066 | { | |
63f3444f TG |
1067 | rtnl_register(PF_INET, RTM_NEWROUTE, inet_rtm_newroute, NULL); |
1068 | rtnl_register(PF_INET, RTM_DELROUTE, inet_rtm_delroute, NULL); | |
1069 | rtnl_register(PF_INET, RTM_GETROUTE, NULL, inet_dump_fib); | |
7b1a74fd DL |
1070 | |
1071 | register_pernet_subsys(&fib_net_ops); | |
1072 | register_netdevice_notifier(&fib_netdev_notifier); | |
1073 | register_inetaddr_notifier(&fib_inetaddr_notifier); | |
7f9b8052 SH |
1074 | |
1075 | fib_hash_init(); | |
1da177e4 LT |
1076 | } |
1077 | ||
1078 | EXPORT_SYMBOL(inet_addr_type); | |
05538116 | 1079 | EXPORT_SYMBOL(inet_dev_addr_type); |
a1e8733e | 1080 | EXPORT_SYMBOL(ip_dev_find); |