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