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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> |
1da177e4 | 47 | |
1da177e4 LT |
48 | #ifndef CONFIG_IP_MULTIPLE_TABLES |
49 | ||
7b1a74fd | 50 | static int __net_init fib4_rules_init(struct net *net) |
c3e9a353 | 51 | { |
93456b6d DL |
52 | struct fib_table *local_table, *main_table; |
53 | ||
7f9b8052 | 54 | local_table = fib_hash_table(RT_TABLE_LOCAL); |
93456b6d | 55 | if (local_table == NULL) |
dbb50165 DL |
56 | return -ENOMEM; |
57 | ||
7f9b8052 | 58 | main_table = fib_hash_table(RT_TABLE_MAIN); |
93456b6d | 59 | if (main_table == NULL) |
dbb50165 DL |
60 | goto fail; |
61 | ||
93456b6d | 62 | hlist_add_head_rcu(&local_table->tb_hlist, |
e4aef8ae | 63 | &net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX]); |
93456b6d | 64 | hlist_add_head_rcu(&main_table->tb_hlist, |
e4aef8ae | 65 | &net->ipv4.fib_table_hash[TABLE_MAIN_INDEX]); |
dbb50165 DL |
66 | return 0; |
67 | ||
68 | fail: | |
93456b6d | 69 | kfree(local_table); |
dbb50165 | 70 | return -ENOMEM; |
c3e9a353 | 71 | } |
1af5a8c4 | 72 | #else |
1da177e4 | 73 | |
8ad4942c | 74 | struct fib_table *fib_new_table(struct net *net, u32 id) |
1da177e4 LT |
75 | { |
76 | struct fib_table *tb; | |
1af5a8c4 | 77 | unsigned int h; |
1da177e4 | 78 | |
1af5a8c4 PM |
79 | if (id == 0) |
80 | id = RT_TABLE_MAIN; | |
8ad4942c | 81 | tb = fib_get_table(net, id); |
1af5a8c4 PM |
82 | if (tb) |
83 | return tb; | |
7f9b8052 SH |
84 | |
85 | tb = fib_hash_table(id); | |
1da177e4 LT |
86 | if (!tb) |
87 | return NULL; | |
1af5a8c4 | 88 | h = id & (FIB_TABLE_HASHSZ - 1); |
e4aef8ae | 89 | hlist_add_head_rcu(&tb->tb_hlist, &net->ipv4.fib_table_hash[h]); |
1da177e4 LT |
90 | return tb; |
91 | } | |
92 | ||
8ad4942c | 93 | struct fib_table *fib_get_table(struct net *net, u32 id) |
1af5a8c4 PM |
94 | { |
95 | struct fib_table *tb; | |
96 | struct hlist_node *node; | |
e4aef8ae | 97 | struct hlist_head *head; |
1af5a8c4 | 98 | unsigned int h; |
1da177e4 | 99 | |
1af5a8c4 PM |
100 | if (id == 0) |
101 | id = RT_TABLE_MAIN; | |
102 | h = id & (FIB_TABLE_HASHSZ - 1); | |
e4aef8ae | 103 | |
1af5a8c4 | 104 | rcu_read_lock(); |
e4aef8ae DL |
105 | head = &net->ipv4.fib_table_hash[h]; |
106 | hlist_for_each_entry_rcu(tb, node, head, tb_hlist) { | |
1af5a8c4 PM |
107 | if (tb->tb_id == id) { |
108 | rcu_read_unlock(); | |
109 | return tb; | |
110 | } | |
111 | } | |
112 | rcu_read_unlock(); | |
113 | return NULL; | |
114 | } | |
1da177e4 LT |
115 | #endif /* CONFIG_IP_MULTIPLE_TABLES */ |
116 | ||
010278ec DL |
117 | void fib_select_default(struct net *net, |
118 | const struct flowi *flp, struct fib_result *res) | |
64c2d538 DL |
119 | { |
120 | struct fib_table *tb; | |
121 | int table = RT_TABLE_MAIN; | |
122 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
123 | if (res->r == NULL || res->r->action != FR_ACT_TO_TBL) | |
124 | return; | |
125 | table = res->r->table; | |
126 | #endif | |
010278ec | 127 | tb = fib_get_table(net, table); |
64c2d538 | 128 | if (FIB_RES_GW(*res) && FIB_RES_NH(*res).nh_scope == RT_SCOPE_LINK) |
16c6cf8b | 129 | fib_table_select_default(tb, flp, res); |
64c2d538 DL |
130 | } |
131 | ||
e4aef8ae | 132 | static void fib_flush(struct net *net) |
1da177e4 LT |
133 | { |
134 | int flushed = 0; | |
1da177e4 | 135 | struct fib_table *tb; |
1af5a8c4 | 136 | struct hlist_node *node; |
e4aef8ae | 137 | struct hlist_head *head; |
1af5a8c4 | 138 | unsigned int h; |
1da177e4 | 139 | |
1af5a8c4 | 140 | for (h = 0; h < FIB_TABLE_HASHSZ; h++) { |
e4aef8ae DL |
141 | head = &net->ipv4.fib_table_hash[h]; |
142 | hlist_for_each_entry(tb, node, head, tb_hlist) | |
16c6cf8b | 143 | flushed += fib_table_flush(tb); |
1da177e4 | 144 | } |
1da177e4 LT |
145 | |
146 | if (flushed) | |
76e6ebfb | 147 | rt_cache_flush(net, -1); |
1da177e4 LT |
148 | } |
149 | ||
150 | /* | |
151 | * Find the first device with a given source address. | |
152 | */ | |
153 | ||
1ab35276 | 154 | struct net_device * ip_dev_find(struct net *net, __be32 addr) |
1da177e4 | 155 | { |
4465b469 TH |
156 | struct flowi fl = { .nl_u = { .ip4_u = { .daddr = addr } }, |
157 | .flags = FLOWI_FLAG_MATCH_ANY_IIF }; | |
1da177e4 LT |
158 | struct fib_result res; |
159 | struct net_device *dev = NULL; | |
160 | ||
161 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
162 | res.r = NULL; | |
163 | #endif | |
164 | ||
4465b469 | 165 | if (fib_lookup(net, &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 | } | |
4bc2f18b | 177 | EXPORT_SYMBOL(ip_dev_find); |
1da177e4 | 178 | |
05538116 LAT |
179 | /* |
180 | * Find address type as if only "dev" was present in the system. If | |
181 | * on_dev is NULL then all interfaces are taken into consideration. | |
182 | */ | |
6b175b26 EB |
183 | static inline unsigned __inet_dev_addr_type(struct net *net, |
184 | const struct net_device *dev, | |
05538116 | 185 | __be32 addr) |
1da177e4 LT |
186 | { |
187 | struct flowi fl = { .nl_u = { .ip4_u = { .daddr = addr } } }; | |
188 | struct fib_result res; | |
189 | unsigned ret = RTN_BROADCAST; | |
03cf786c | 190 | struct fib_table *local_table; |
1da177e4 | 191 | |
1e637c74 | 192 | if (ipv4_is_zeronet(addr) || ipv4_is_lbcast(addr)) |
1da177e4 | 193 | return RTN_BROADCAST; |
f97c1e0c | 194 | if (ipv4_is_multicast(addr)) |
1da177e4 LT |
195 | return RTN_MULTICAST; |
196 | ||
197 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
198 | res.r = NULL; | |
199 | #endif | |
e905a9ed | 200 | |
6b175b26 | 201 | local_table = fib_get_table(net, RT_TABLE_LOCAL); |
03cf786c | 202 | if (local_table) { |
1da177e4 | 203 | ret = RTN_UNICAST; |
16c6cf8b | 204 | if (!fib_table_lookup(local_table, &fl, &res)) { |
05538116 LAT |
205 | if (!dev || dev == res.fi->fib_dev) |
206 | ret = res.type; | |
1da177e4 LT |
207 | fib_res_put(&res); |
208 | } | |
209 | } | |
210 | return ret; | |
211 | } | |
212 | ||
6b175b26 | 213 | unsigned int inet_addr_type(struct net *net, __be32 addr) |
05538116 | 214 | { |
6b175b26 | 215 | return __inet_dev_addr_type(net, NULL, addr); |
05538116 | 216 | } |
4bc2f18b | 217 | EXPORT_SYMBOL(inet_addr_type); |
05538116 | 218 | |
6b175b26 EB |
219 | unsigned int inet_dev_addr_type(struct net *net, const struct net_device *dev, |
220 | __be32 addr) | |
05538116 | 221 | { |
6b175b26 | 222 | return __inet_dev_addr_type(net, dev, addr); |
05538116 | 223 | } |
4bc2f18b | 224 | EXPORT_SYMBOL(inet_dev_addr_type); |
05538116 | 225 | |
1da177e4 LT |
226 | /* Given (packet source, input interface) and optional (dst, oif, tos): |
227 | - (main) check, that source is valid i.e. not broadcast or our local | |
228 | address. | |
229 | - figure out what "logical" interface this packet arrived | |
230 | and calculate "specific destination" address. | |
231 | - check, that packet arrived from expected physical interface. | |
232 | */ | |
233 | ||
d9c9df8c | 234 | int fib_validate_source(__be32 src, __be32 dst, u8 tos, int oif, |
b0c110ca | 235 | struct net_device *dev, __be32 *spec_dst, |
236 | u32 *itag, u32 mark) | |
1da177e4 LT |
237 | { |
238 | struct in_device *in_dev; | |
239 | struct flowi fl = { .nl_u = { .ip4_u = | |
240 | { .daddr = src, | |
241 | .saddr = dst, | |
242 | .tos = tos } }, | |
b0c110ca | 243 | .mark = mark, |
1da177e4 | 244 | .iif = oif }; |
b0c110ca | 245 | |
1da177e4 | 246 | struct fib_result res; |
8153a10c | 247 | int no_addr, rpf, accept_local; |
6f86b325 | 248 | bool dev_match; |
1da177e4 | 249 | int ret; |
5b707aaa | 250 | struct net *net; |
1da177e4 | 251 | |
8153a10c | 252 | no_addr = rpf = accept_local = 0; |
1da177e4 | 253 | rcu_read_lock(); |
e5ed6399 | 254 | in_dev = __in_dev_get_rcu(dev); |
1da177e4 LT |
255 | if (in_dev) { |
256 | no_addr = in_dev->ifa_list == NULL; | |
257 | rpf = IN_DEV_RPFILTER(in_dev); | |
8153a10c | 258 | accept_local = IN_DEV_ACCEPT_LOCAL(in_dev); |
28f6aeea JHS |
259 | if (mark && !IN_DEV_SRC_VMARK(in_dev)) |
260 | fl.mark = 0; | |
1da177e4 LT |
261 | } |
262 | rcu_read_unlock(); | |
263 | ||
264 | if (in_dev == NULL) | |
265 | goto e_inval; | |
266 | ||
c346dca1 | 267 | net = dev_net(dev); |
5b707aaa | 268 | if (fib_lookup(net, &fl, &res)) |
1da177e4 | 269 | goto last_resort; |
8153a10c PM |
270 | if (res.type != RTN_UNICAST) { |
271 | if (res.type != RTN_LOCAL || !accept_local) | |
272 | goto e_inval_res; | |
273 | } | |
1da177e4 LT |
274 | *spec_dst = FIB_RES_PREFSRC(res); |
275 | fib_combine_itag(itag, &res); | |
6f86b325 DM |
276 | dev_match = false; |
277 | ||
1da177e4 | 278 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
6f86b325 DM |
279 | for (ret = 0; ret < res.fi->fib_nhs; ret++) { |
280 | struct fib_nh *nh = &res.fi->fib_nh[ret]; | |
281 | ||
282 | if (nh->nh_dev == dev) { | |
283 | dev_match = true; | |
284 | break; | |
285 | } | |
286 | } | |
1da177e4 LT |
287 | #else |
288 | if (FIB_RES_DEV(res) == dev) | |
6f86b325 | 289 | dev_match = true; |
1da177e4 | 290 | #endif |
6f86b325 | 291 | if (dev_match) { |
1da177e4 LT |
292 | ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST; |
293 | fib_res_put(&res); | |
294 | return ret; | |
295 | } | |
296 | fib_res_put(&res); | |
297 | if (no_addr) | |
298 | goto last_resort; | |
c1cf8422 | 299 | if (rpf == 1) |
b5f7e755 | 300 | goto e_rpf; |
1da177e4 LT |
301 | fl.oif = dev->ifindex; |
302 | ||
303 | ret = 0; | |
5b707aaa | 304 | if (fib_lookup(net, &fl, &res) == 0) { |
1da177e4 LT |
305 | if (res.type == RTN_UNICAST) { |
306 | *spec_dst = FIB_RES_PREFSRC(res); | |
307 | ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST; | |
308 | } | |
309 | fib_res_put(&res); | |
310 | } | |
311 | return ret; | |
312 | ||
313 | last_resort: | |
314 | if (rpf) | |
b5f7e755 | 315 | goto e_rpf; |
1da177e4 LT |
316 | *spec_dst = inet_select_addr(dev, 0, RT_SCOPE_UNIVERSE); |
317 | *itag = 0; | |
318 | return 0; | |
319 | ||
320 | e_inval_res: | |
321 | fib_res_put(&res); | |
322 | e_inval: | |
323 | return -EINVAL; | |
b5f7e755 ED |
324 | e_rpf: |
325 | return -EXDEV; | |
1da177e4 LT |
326 | } |
327 | ||
81f7bf6c | 328 | static inline __be32 sk_extract_addr(struct sockaddr *addr) |
4e902c57 TG |
329 | { |
330 | return ((struct sockaddr_in *) addr)->sin_addr.s_addr; | |
331 | } | |
332 | ||
333 | static int put_rtax(struct nlattr *mx, int len, int type, u32 value) | |
334 | { | |
335 | struct nlattr *nla; | |
336 | ||
337 | nla = (struct nlattr *) ((char *) mx + len); | |
338 | nla->nla_type = type; | |
339 | nla->nla_len = nla_attr_size(4); | |
340 | *(u32 *) nla_data(nla) = value; | |
341 | ||
342 | return len + nla_total_size(4); | |
343 | } | |
344 | ||
4b5d47d4 | 345 | static int rtentry_to_fib_config(struct net *net, int cmd, struct rtentry *rt, |
4e902c57 TG |
346 | struct fib_config *cfg) |
347 | { | |
6d85c10a | 348 | __be32 addr; |
4e902c57 TG |
349 | int plen; |
350 | ||
351 | memset(cfg, 0, sizeof(*cfg)); | |
4b5d47d4 | 352 | cfg->fc_nlinfo.nl_net = net; |
4e902c57 TG |
353 | |
354 | if (rt->rt_dst.sa_family != AF_INET) | |
355 | return -EAFNOSUPPORT; | |
356 | ||
357 | /* | |
358 | * Check mask for validity: | |
359 | * a) it must be contiguous. | |
360 | * b) destination must have all host bits clear. | |
361 | * c) if application forgot to set correct family (AF_INET), | |
362 | * reject request unless it is absolutely clear i.e. | |
363 | * both family and mask are zero. | |
364 | */ | |
365 | plen = 32; | |
366 | addr = sk_extract_addr(&rt->rt_dst); | |
367 | if (!(rt->rt_flags & RTF_HOST)) { | |
81f7bf6c | 368 | __be32 mask = sk_extract_addr(&rt->rt_genmask); |
4e902c57 TG |
369 | |
370 | if (rt->rt_genmask.sa_family != AF_INET) { | |
371 | if (mask || rt->rt_genmask.sa_family) | |
372 | return -EAFNOSUPPORT; | |
373 | } | |
374 | ||
375 | if (bad_mask(mask, addr)) | |
376 | return -EINVAL; | |
377 | ||
378 | plen = inet_mask_len(mask); | |
379 | } | |
380 | ||
381 | cfg->fc_dst_len = plen; | |
382 | cfg->fc_dst = addr; | |
383 | ||
384 | if (cmd != SIOCDELRT) { | |
385 | cfg->fc_nlflags = NLM_F_CREATE; | |
386 | cfg->fc_protocol = RTPROT_BOOT; | |
387 | } | |
388 | ||
389 | if (rt->rt_metric) | |
390 | cfg->fc_priority = rt->rt_metric - 1; | |
391 | ||
392 | if (rt->rt_flags & RTF_REJECT) { | |
393 | cfg->fc_scope = RT_SCOPE_HOST; | |
394 | cfg->fc_type = RTN_UNREACHABLE; | |
395 | return 0; | |
396 | } | |
397 | ||
398 | cfg->fc_scope = RT_SCOPE_NOWHERE; | |
399 | cfg->fc_type = RTN_UNICAST; | |
400 | ||
401 | if (rt->rt_dev) { | |
402 | char *colon; | |
403 | struct net_device *dev; | |
404 | char devname[IFNAMSIZ]; | |
405 | ||
406 | if (copy_from_user(devname, rt->rt_dev, IFNAMSIZ-1)) | |
407 | return -EFAULT; | |
408 | ||
409 | devname[IFNAMSIZ-1] = 0; | |
410 | colon = strchr(devname, ':'); | |
411 | if (colon) | |
412 | *colon = 0; | |
4b5d47d4 | 413 | dev = __dev_get_by_name(net, devname); |
4e902c57 TG |
414 | if (!dev) |
415 | return -ENODEV; | |
416 | cfg->fc_oif = dev->ifindex; | |
417 | if (colon) { | |
418 | struct in_ifaddr *ifa; | |
419 | struct in_device *in_dev = __in_dev_get_rtnl(dev); | |
420 | if (!in_dev) | |
421 | return -ENODEV; | |
422 | *colon = ':'; | |
423 | for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) | |
424 | if (strcmp(ifa->ifa_label, devname) == 0) | |
425 | break; | |
426 | if (ifa == NULL) | |
427 | return -ENODEV; | |
428 | cfg->fc_prefsrc = ifa->ifa_local; | |
429 | } | |
430 | } | |
431 | ||
432 | addr = sk_extract_addr(&rt->rt_gateway); | |
433 | if (rt->rt_gateway.sa_family == AF_INET && addr) { | |
434 | cfg->fc_gw = addr; | |
435 | if (rt->rt_flags & RTF_GATEWAY && | |
4b5d47d4 | 436 | inet_addr_type(net, addr) == RTN_UNICAST) |
4e902c57 TG |
437 | cfg->fc_scope = RT_SCOPE_UNIVERSE; |
438 | } | |
439 | ||
440 | if (cmd == SIOCDELRT) | |
441 | return 0; | |
442 | ||
443 | if (rt->rt_flags & RTF_GATEWAY && !cfg->fc_gw) | |
444 | return -EINVAL; | |
445 | ||
446 | if (cfg->fc_scope == RT_SCOPE_NOWHERE) | |
447 | cfg->fc_scope = RT_SCOPE_LINK; | |
448 | ||
449 | if (rt->rt_flags & (RTF_MTU | RTF_WINDOW | RTF_IRTT)) { | |
450 | struct nlattr *mx; | |
451 | int len = 0; | |
452 | ||
453 | mx = kzalloc(3 * nla_total_size(4), GFP_KERNEL); | |
e905a9ed | 454 | if (mx == NULL) |
4e902c57 TG |
455 | return -ENOMEM; |
456 | ||
457 | if (rt->rt_flags & RTF_MTU) | |
458 | len = put_rtax(mx, len, RTAX_ADVMSS, rt->rt_mtu - 40); | |
459 | ||
460 | if (rt->rt_flags & RTF_WINDOW) | |
461 | len = put_rtax(mx, len, RTAX_WINDOW, rt->rt_window); | |
462 | ||
463 | if (rt->rt_flags & RTF_IRTT) | |
464 | len = put_rtax(mx, len, RTAX_RTT, rt->rt_irtt << 3); | |
465 | ||
466 | cfg->fc_mx = mx; | |
467 | cfg->fc_mx_len = len; | |
468 | } | |
469 | ||
470 | return 0; | |
471 | } | |
472 | ||
1da177e4 LT |
473 | /* |
474 | * Handle IP routing ioctl calls. These are used to manipulate the routing tables | |
475 | */ | |
e905a9ed | 476 | |
1bad118a | 477 | int ip_rt_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
1da177e4 | 478 | { |
4e902c57 TG |
479 | struct fib_config cfg; |
480 | struct rtentry rt; | |
1da177e4 | 481 | int err; |
1da177e4 LT |
482 | |
483 | switch (cmd) { | |
484 | case SIOCADDRT: /* Add a route */ | |
485 | case SIOCDELRT: /* Delete a route */ | |
486 | if (!capable(CAP_NET_ADMIN)) | |
487 | return -EPERM; | |
4e902c57 TG |
488 | |
489 | if (copy_from_user(&rt, arg, sizeof(rt))) | |
1da177e4 | 490 | return -EFAULT; |
4e902c57 | 491 | |
1da177e4 | 492 | rtnl_lock(); |
1bad118a | 493 | err = rtentry_to_fib_config(net, cmd, &rt, &cfg); |
1da177e4 | 494 | if (err == 0) { |
4e902c57 TG |
495 | struct fib_table *tb; |
496 | ||
1da177e4 | 497 | if (cmd == SIOCDELRT) { |
1bad118a | 498 | tb = fib_get_table(net, cfg.fc_table); |
1da177e4 | 499 | if (tb) |
16c6cf8b | 500 | err = fib_table_delete(tb, &cfg); |
4e902c57 TG |
501 | else |
502 | err = -ESRCH; | |
1da177e4 | 503 | } else { |
1bad118a | 504 | tb = fib_new_table(net, cfg.fc_table); |
1da177e4 | 505 | if (tb) |
16c6cf8b | 506 | err = fib_table_insert(tb, &cfg); |
4e902c57 TG |
507 | else |
508 | err = -ENOBUFS; | |
1da177e4 | 509 | } |
4e902c57 TG |
510 | |
511 | /* allocated by rtentry_to_fib_config() */ | |
512 | kfree(cfg.fc_mx); | |
1da177e4 LT |
513 | } |
514 | rtnl_unlock(); | |
515 | return err; | |
516 | } | |
517 | return -EINVAL; | |
518 | } | |
519 | ||
ef7c79ed | 520 | const struct nla_policy rtm_ipv4_policy[RTA_MAX+1] = { |
4e902c57 TG |
521 | [RTA_DST] = { .type = NLA_U32 }, |
522 | [RTA_SRC] = { .type = NLA_U32 }, | |
523 | [RTA_IIF] = { .type = NLA_U32 }, | |
524 | [RTA_OIF] = { .type = NLA_U32 }, | |
525 | [RTA_GATEWAY] = { .type = NLA_U32 }, | |
526 | [RTA_PRIORITY] = { .type = NLA_U32 }, | |
527 | [RTA_PREFSRC] = { .type = NLA_U32 }, | |
528 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
5176f91e | 529 | [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) }, |
4e902c57 | 530 | [RTA_FLOW] = { .type = NLA_U32 }, |
4e902c57 TG |
531 | }; |
532 | ||
4b5d47d4 DL |
533 | static int rtm_to_fib_config(struct net *net, struct sk_buff *skb, |
534 | struct nlmsghdr *nlh, struct fib_config *cfg) | |
1da177e4 | 535 | { |
4e902c57 TG |
536 | struct nlattr *attr; |
537 | int err, remaining; | |
538 | struct rtmsg *rtm; | |
539 | ||
540 | err = nlmsg_validate(nlh, sizeof(*rtm), RTA_MAX, rtm_ipv4_policy); | |
541 | if (err < 0) | |
542 | goto errout; | |
543 | ||
544 | memset(cfg, 0, sizeof(*cfg)); | |
545 | ||
546 | rtm = nlmsg_data(nlh); | |
4e902c57 | 547 | cfg->fc_dst_len = rtm->rtm_dst_len; |
4e902c57 TG |
548 | cfg->fc_tos = rtm->rtm_tos; |
549 | cfg->fc_table = rtm->rtm_table; | |
550 | cfg->fc_protocol = rtm->rtm_protocol; | |
551 | cfg->fc_scope = rtm->rtm_scope; | |
552 | cfg->fc_type = rtm->rtm_type; | |
553 | cfg->fc_flags = rtm->rtm_flags; | |
554 | cfg->fc_nlflags = nlh->nlmsg_flags; | |
555 | ||
556 | cfg->fc_nlinfo.pid = NETLINK_CB(skb).pid; | |
557 | cfg->fc_nlinfo.nlh = nlh; | |
4b5d47d4 | 558 | cfg->fc_nlinfo.nl_net = net; |
4e902c57 | 559 | |
a0ee18b9 TG |
560 | if (cfg->fc_type > RTN_MAX) { |
561 | err = -EINVAL; | |
562 | goto errout; | |
563 | } | |
564 | ||
4e902c57 | 565 | nlmsg_for_each_attr(attr, nlh, sizeof(struct rtmsg), remaining) { |
8f4c1f9b | 566 | switch (nla_type(attr)) { |
4e902c57 | 567 | case RTA_DST: |
17fb2c64 | 568 | cfg->fc_dst = nla_get_be32(attr); |
4e902c57 | 569 | break; |
4e902c57 TG |
570 | case RTA_OIF: |
571 | cfg->fc_oif = nla_get_u32(attr); | |
572 | break; | |
573 | case RTA_GATEWAY: | |
17fb2c64 | 574 | cfg->fc_gw = nla_get_be32(attr); |
4e902c57 TG |
575 | break; |
576 | case RTA_PRIORITY: | |
577 | cfg->fc_priority = nla_get_u32(attr); | |
578 | break; | |
579 | case RTA_PREFSRC: | |
17fb2c64 | 580 | cfg->fc_prefsrc = nla_get_be32(attr); |
4e902c57 TG |
581 | break; |
582 | case RTA_METRICS: | |
583 | cfg->fc_mx = nla_data(attr); | |
584 | cfg->fc_mx_len = nla_len(attr); | |
585 | break; | |
586 | case RTA_MULTIPATH: | |
587 | cfg->fc_mp = nla_data(attr); | |
588 | cfg->fc_mp_len = nla_len(attr); | |
589 | break; | |
590 | case RTA_FLOW: | |
591 | cfg->fc_flow = nla_get_u32(attr); | |
592 | break; | |
4e902c57 TG |
593 | case RTA_TABLE: |
594 | cfg->fc_table = nla_get_u32(attr); | |
595 | break; | |
1da177e4 LT |
596 | } |
597 | } | |
4e902c57 | 598 | |
1da177e4 | 599 | return 0; |
4e902c57 TG |
600 | errout: |
601 | return err; | |
1da177e4 LT |
602 | } |
603 | ||
6ed2533e | 604 | static int inet_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) |
1da177e4 | 605 | { |
3b1e0a65 | 606 | struct net *net = sock_net(skb->sk); |
4e902c57 TG |
607 | struct fib_config cfg; |
608 | struct fib_table *tb; | |
609 | int err; | |
1da177e4 | 610 | |
4b5d47d4 | 611 | err = rtm_to_fib_config(net, skb, nlh, &cfg); |
4e902c57 TG |
612 | if (err < 0) |
613 | goto errout; | |
1da177e4 | 614 | |
8ad4942c | 615 | tb = fib_get_table(net, cfg.fc_table); |
4e902c57 TG |
616 | if (tb == NULL) { |
617 | err = -ESRCH; | |
618 | goto errout; | |
619 | } | |
620 | ||
16c6cf8b | 621 | err = fib_table_delete(tb, &cfg); |
4e902c57 TG |
622 | errout: |
623 | return err; | |
1da177e4 LT |
624 | } |
625 | ||
6ed2533e | 626 | static int inet_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) |
1da177e4 | 627 | { |
3b1e0a65 | 628 | struct net *net = sock_net(skb->sk); |
4e902c57 TG |
629 | struct fib_config cfg; |
630 | struct fib_table *tb; | |
631 | int err; | |
1da177e4 | 632 | |
4b5d47d4 | 633 | err = rtm_to_fib_config(net, skb, nlh, &cfg); |
4e902c57 TG |
634 | if (err < 0) |
635 | goto errout; | |
1da177e4 | 636 | |
226b0b4a | 637 | tb = fib_new_table(net, cfg.fc_table); |
4e902c57 TG |
638 | if (tb == NULL) { |
639 | err = -ENOBUFS; | |
640 | goto errout; | |
641 | } | |
642 | ||
16c6cf8b | 643 | err = fib_table_insert(tb, &cfg); |
4e902c57 TG |
644 | errout: |
645 | return err; | |
1da177e4 LT |
646 | } |
647 | ||
63f3444f | 648 | static int inet_dump_fib(struct sk_buff *skb, struct netlink_callback *cb) |
1da177e4 | 649 | { |
3b1e0a65 | 650 | struct net *net = sock_net(skb->sk); |
1af5a8c4 PM |
651 | unsigned int h, s_h; |
652 | unsigned int e = 0, s_e; | |
1da177e4 | 653 | struct fib_table *tb; |
1af5a8c4 | 654 | struct hlist_node *node; |
e4aef8ae | 655 | struct hlist_head *head; |
1af5a8c4 | 656 | int dumped = 0; |
1da177e4 | 657 | |
be403ea1 TG |
658 | if (nlmsg_len(cb->nlh) >= sizeof(struct rtmsg) && |
659 | ((struct rtmsg *) nlmsg_data(cb->nlh))->rtm_flags & RTM_F_CLONED) | |
1da177e4 LT |
660 | return ip_rt_dump(skb, cb); |
661 | ||
1af5a8c4 PM |
662 | s_h = cb->args[0]; |
663 | s_e = cb->args[1]; | |
664 | ||
665 | for (h = s_h; h < FIB_TABLE_HASHSZ; h++, s_e = 0) { | |
666 | e = 0; | |
e4aef8ae DL |
667 | head = &net->ipv4.fib_table_hash[h]; |
668 | hlist_for_each_entry(tb, node, head, tb_hlist) { | |
1af5a8c4 PM |
669 | if (e < s_e) |
670 | goto next; | |
671 | if (dumped) | |
672 | memset(&cb->args[2], 0, sizeof(cb->args) - | |
e905a9ed | 673 | 2 * sizeof(cb->args[0])); |
16c6cf8b | 674 | if (fib_table_dump(tb, skb, cb) < 0) |
1af5a8c4 PM |
675 | goto out; |
676 | dumped = 1; | |
677 | next: | |
678 | e++; | |
679 | } | |
1da177e4 | 680 | } |
1af5a8c4 PM |
681 | out: |
682 | cb->args[1] = e; | |
683 | cb->args[0] = h; | |
1da177e4 LT |
684 | |
685 | return skb->len; | |
686 | } | |
687 | ||
688 | /* Prepare and feed intra-kernel routing request. | |
689 | Really, it should be netlink message, but :-( netlink | |
690 | can be not configured, so that we feed it directly | |
691 | to fib engine. It is legal, because all events occur | |
692 | only when netlink is already locked. | |
693 | */ | |
694 | ||
81f7bf6c | 695 | static void fib_magic(int cmd, int type, __be32 dst, int dst_len, struct in_ifaddr *ifa) |
1da177e4 | 696 | { |
c346dca1 | 697 | struct net *net = dev_net(ifa->ifa_dev->dev); |
4e902c57 TG |
698 | struct fib_table *tb; |
699 | struct fib_config cfg = { | |
700 | .fc_protocol = RTPROT_KERNEL, | |
701 | .fc_type = type, | |
702 | .fc_dst = dst, | |
703 | .fc_dst_len = dst_len, | |
704 | .fc_prefsrc = ifa->ifa_local, | |
705 | .fc_oif = ifa->ifa_dev->dev->ifindex, | |
706 | .fc_nlflags = NLM_F_CREATE | NLM_F_APPEND, | |
4d1169c1 | 707 | .fc_nlinfo = { |
4b5d47d4 | 708 | .nl_net = net, |
4d1169c1 | 709 | }, |
4e902c57 | 710 | }; |
1da177e4 LT |
711 | |
712 | if (type == RTN_UNICAST) | |
4b5d47d4 | 713 | tb = fib_new_table(net, RT_TABLE_MAIN); |
1da177e4 | 714 | else |
4b5d47d4 | 715 | tb = fib_new_table(net, RT_TABLE_LOCAL); |
1da177e4 LT |
716 | |
717 | if (tb == NULL) | |
718 | return; | |
719 | ||
4e902c57 | 720 | cfg.fc_table = tb->tb_id; |
1da177e4 | 721 | |
4e902c57 TG |
722 | if (type != RTN_LOCAL) |
723 | cfg.fc_scope = RT_SCOPE_LINK; | |
724 | else | |
725 | cfg.fc_scope = RT_SCOPE_HOST; | |
1da177e4 LT |
726 | |
727 | if (cmd == RTM_NEWROUTE) | |
16c6cf8b | 728 | fib_table_insert(tb, &cfg); |
1da177e4 | 729 | else |
16c6cf8b | 730 | fib_table_delete(tb, &cfg); |
1da177e4 LT |
731 | } |
732 | ||
0ff60a45 | 733 | void fib_add_ifaddr(struct in_ifaddr *ifa) |
1da177e4 LT |
734 | { |
735 | struct in_device *in_dev = ifa->ifa_dev; | |
736 | struct net_device *dev = in_dev->dev; | |
737 | struct in_ifaddr *prim = ifa; | |
a144ea4b AV |
738 | __be32 mask = ifa->ifa_mask; |
739 | __be32 addr = ifa->ifa_local; | |
740 | __be32 prefix = ifa->ifa_address&mask; | |
1da177e4 LT |
741 | |
742 | if (ifa->ifa_flags&IFA_F_SECONDARY) { | |
743 | prim = inet_ifa_byprefix(in_dev, prefix, mask); | |
744 | if (prim == NULL) { | |
a6db9010 | 745 | printk(KERN_WARNING "fib_add_ifaddr: bug: prim == NULL\n"); |
1da177e4 LT |
746 | return; |
747 | } | |
748 | } | |
749 | ||
750 | fib_magic(RTM_NEWROUTE, RTN_LOCAL, addr, 32, prim); | |
751 | ||
752 | if (!(dev->flags&IFF_UP)) | |
753 | return; | |
754 | ||
755 | /* Add broadcast address, if it is explicitly assigned. */ | |
a144ea4b | 756 | if (ifa->ifa_broadcast && ifa->ifa_broadcast != htonl(0xFFFFFFFF)) |
1da177e4 LT |
757 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim); |
758 | ||
f97c1e0c | 759 | if (!ipv4_is_zeronet(prefix) && !(ifa->ifa_flags&IFA_F_SECONDARY) && |
1da177e4 LT |
760 | (prefix != addr || ifa->ifa_prefixlen < 32)) { |
761 | fib_magic(RTM_NEWROUTE, dev->flags&IFF_LOOPBACK ? RTN_LOCAL : | |
762 | RTN_UNICAST, prefix, ifa->ifa_prefixlen, prim); | |
763 | ||
764 | /* Add network specific broadcasts, when it takes a sense */ | |
765 | if (ifa->ifa_prefixlen < 31) { | |
766 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix, 32, prim); | |
767 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix|~mask, 32, prim); | |
768 | } | |
769 | } | |
770 | } | |
771 | ||
772 | static void fib_del_ifaddr(struct in_ifaddr *ifa) | |
773 | { | |
774 | struct in_device *in_dev = ifa->ifa_dev; | |
775 | struct net_device *dev = in_dev->dev; | |
776 | struct in_ifaddr *ifa1; | |
777 | struct in_ifaddr *prim = ifa; | |
a144ea4b AV |
778 | __be32 brd = ifa->ifa_address|~ifa->ifa_mask; |
779 | __be32 any = ifa->ifa_address&ifa->ifa_mask; | |
1da177e4 LT |
780 | #define LOCAL_OK 1 |
781 | #define BRD_OK 2 | |
782 | #define BRD0_OK 4 | |
783 | #define BRD1_OK 8 | |
784 | unsigned ok = 0; | |
785 | ||
786 | if (!(ifa->ifa_flags&IFA_F_SECONDARY)) | |
787 | fib_magic(RTM_DELROUTE, dev->flags&IFF_LOOPBACK ? RTN_LOCAL : | |
788 | RTN_UNICAST, any, ifa->ifa_prefixlen, prim); | |
789 | else { | |
790 | prim = inet_ifa_byprefix(in_dev, any, ifa->ifa_mask); | |
791 | if (prim == NULL) { | |
a6db9010 | 792 | printk(KERN_WARNING "fib_del_ifaddr: bug: prim == NULL\n"); |
1da177e4 LT |
793 | return; |
794 | } | |
795 | } | |
796 | ||
797 | /* Deletion is more complicated than add. | |
798 | We should take care of not to delete too much :-) | |
799 | ||
800 | Scan address list to be sure that addresses are really gone. | |
801 | */ | |
802 | ||
803 | for (ifa1 = in_dev->ifa_list; ifa1; ifa1 = ifa1->ifa_next) { | |
804 | if (ifa->ifa_local == ifa1->ifa_local) | |
805 | ok |= LOCAL_OK; | |
806 | if (ifa->ifa_broadcast == ifa1->ifa_broadcast) | |
807 | ok |= BRD_OK; | |
808 | if (brd == ifa1->ifa_broadcast) | |
809 | ok |= BRD1_OK; | |
810 | if (any == ifa1->ifa_broadcast) | |
811 | ok |= BRD0_OK; | |
812 | } | |
813 | ||
814 | if (!(ok&BRD_OK)) | |
815 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim); | |
816 | if (!(ok&BRD1_OK)) | |
817 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, brd, 32, prim); | |
818 | if (!(ok&BRD0_OK)) | |
819 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, any, 32, prim); | |
820 | if (!(ok&LOCAL_OK)) { | |
821 | fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 32, prim); | |
822 | ||
823 | /* Check, that this local address finally disappeared. */ | |
c346dca1 | 824 | if (inet_addr_type(dev_net(dev), ifa->ifa_local) != RTN_LOCAL) { |
1da177e4 LT |
825 | /* And the last, but not the least thing. |
826 | We must flush stray FIB entries. | |
827 | ||
828 | First of all, we scan fib_info list searching | |
829 | for stray nexthop entries, then ignite fib_flush. | |
830 | */ | |
c346dca1 YH |
831 | if (fib_sync_down_addr(dev_net(dev), ifa->ifa_local)) |
832 | fib_flush(dev_net(dev)); | |
1da177e4 LT |
833 | } |
834 | } | |
835 | #undef LOCAL_OK | |
836 | #undef BRD_OK | |
837 | #undef BRD0_OK | |
838 | #undef BRD1_OK | |
839 | } | |
840 | ||
246955fe RO |
841 | static void nl_fib_lookup(struct fib_result_nl *frn, struct fib_table *tb ) |
842 | { | |
e905a9ed | 843 | |
246955fe | 844 | struct fib_result res; |
5f300893 | 845 | struct flowi fl = { .mark = frn->fl_mark, |
47dcf0cb | 846 | .nl_u = { .ip4_u = { .daddr = frn->fl_addr, |
246955fe RO |
847 | .tos = frn->fl_tos, |
848 | .scope = frn->fl_scope } } }; | |
1194ed0a | 849 | |
912a41a4 SV |
850 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
851 | res.r = NULL; | |
852 | #endif | |
853 | ||
1194ed0a | 854 | frn->err = -ENOENT; |
246955fe RO |
855 | if (tb) { |
856 | local_bh_disable(); | |
857 | ||
858 | frn->tb_id = tb->tb_id; | |
16c6cf8b | 859 | frn->err = fib_table_lookup(tb, &fl, &res); |
246955fe RO |
860 | |
861 | if (!frn->err) { | |
862 | frn->prefixlen = res.prefixlen; | |
863 | frn->nh_sel = res.nh_sel; | |
864 | frn->type = res.type; | |
865 | frn->scope = res.scope; | |
1194ed0a | 866 | fib_res_put(&res); |
246955fe RO |
867 | } |
868 | local_bh_enable(); | |
869 | } | |
870 | } | |
871 | ||
28f7b036 | 872 | static void nl_fib_input(struct sk_buff *skb) |
246955fe | 873 | { |
6bd48fcf | 874 | struct net *net; |
246955fe | 875 | struct fib_result_nl *frn; |
28f7b036 | 876 | struct nlmsghdr *nlh; |
246955fe | 877 | struct fib_table *tb; |
28f7b036 | 878 | u32 pid; |
1194ed0a | 879 | |
3b1e0a65 | 880 | net = sock_net(skb->sk); |
b529ccf2 | 881 | nlh = nlmsg_hdr(skb); |
ea86575e | 882 | if (skb->len < NLMSG_SPACE(0) || skb->len < nlh->nlmsg_len || |
d883a036 | 883 | nlh->nlmsg_len < NLMSG_LENGTH(sizeof(*frn))) |
ea86575e | 884 | return; |
d883a036 DL |
885 | |
886 | skb = skb_clone(skb, GFP_KERNEL); | |
887 | if (skb == NULL) | |
888 | return; | |
889 | nlh = nlmsg_hdr(skb); | |
e905a9ed | 890 | |
246955fe | 891 | frn = (struct fib_result_nl *) NLMSG_DATA(nlh); |
6bd48fcf | 892 | tb = fib_get_table(net, frn->tb_id_in); |
246955fe RO |
893 | |
894 | nl_fib_lookup(frn, tb); | |
e905a9ed | 895 | |
1194ed0a | 896 | pid = NETLINK_CB(skb).pid; /* pid of sending process */ |
246955fe | 897 | NETLINK_CB(skb).pid = 0; /* from kernel */ |
ac6d439d | 898 | NETLINK_CB(skb).dst_group = 0; /* unicast */ |
6bd48fcf | 899 | netlink_unicast(net->ipv4.fibnl, skb, pid, MSG_DONTWAIT); |
e905a9ed | 900 | } |
246955fe | 901 | |
2c8c1e72 | 902 | static int __net_init nl_fib_lookup_init(struct net *net) |
246955fe | 903 | { |
6bd48fcf DL |
904 | struct sock *sk; |
905 | sk = netlink_kernel_create(net, NETLINK_FIB_LOOKUP, 0, | |
906 | nl_fib_input, NULL, THIS_MODULE); | |
907 | if (sk == NULL) | |
7b1a74fd | 908 | return -EAFNOSUPPORT; |
6bd48fcf | 909 | net->ipv4.fibnl = sk; |
7b1a74fd DL |
910 | return 0; |
911 | } | |
912 | ||
913 | static void nl_fib_lookup_exit(struct net *net) | |
914 | { | |
b7c6ba6e | 915 | netlink_kernel_release(net->ipv4.fibnl); |
775516bf | 916 | net->ipv4.fibnl = NULL; |
246955fe RO |
917 | } |
918 | ||
e2ce1468 | 919 | static void fib_disable_ip(struct net_device *dev, int force, int delay) |
1da177e4 | 920 | { |
85326fa5 | 921 | if (fib_sync_down_dev(dev, force)) |
c346dca1 | 922 | fib_flush(dev_net(dev)); |
e2ce1468 | 923 | rt_cache_flush(dev_net(dev), delay); |
1da177e4 LT |
924 | arp_ifdown(dev); |
925 | } | |
926 | ||
927 | static int fib_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr) | |
928 | { | |
6ed2533e | 929 | struct in_ifaddr *ifa = (struct in_ifaddr *)ptr; |
76e6ebfb | 930 | struct net_device *dev = ifa->ifa_dev->dev; |
1da177e4 LT |
931 | |
932 | switch (event) { | |
933 | case NETDEV_UP: | |
934 | fib_add_ifaddr(ifa); | |
935 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
76e6ebfb | 936 | fib_sync_up(dev); |
1da177e4 | 937 | #endif |
76e6ebfb | 938 | rt_cache_flush(dev_net(dev), -1); |
1da177e4 LT |
939 | break; |
940 | case NETDEV_DOWN: | |
941 | fib_del_ifaddr(ifa); | |
9fcc2e8a | 942 | if (ifa->ifa_dev->ifa_list == NULL) { |
1da177e4 LT |
943 | /* Last address was deleted from this interface. |
944 | Disable IP. | |
945 | */ | |
e2ce1468 | 946 | fib_disable_ip(dev, 1, 0); |
1da177e4 | 947 | } else { |
76e6ebfb | 948 | rt_cache_flush(dev_net(dev), -1); |
1da177e4 LT |
949 | } |
950 | break; | |
951 | } | |
952 | return NOTIFY_DONE; | |
953 | } | |
954 | ||
955 | static int fib_netdev_event(struct notifier_block *this, unsigned long event, void *ptr) | |
956 | { | |
957 | struct net_device *dev = ptr; | |
e5ed6399 | 958 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
1da177e4 LT |
959 | |
960 | if (event == NETDEV_UNREGISTER) { | |
e2ce1468 | 961 | fib_disable_ip(dev, 2, -1); |
1da177e4 LT |
962 | return NOTIFY_DONE; |
963 | } | |
964 | ||
965 | if (!in_dev) | |
966 | return NOTIFY_DONE; | |
967 | ||
968 | switch (event) { | |
969 | case NETDEV_UP: | |
970 | for_ifa(in_dev) { | |
971 | fib_add_ifaddr(ifa); | |
972 | } endfor_ifa(in_dev); | |
973 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
974 | fib_sync_up(dev); | |
975 | #endif | |
76e6ebfb | 976 | rt_cache_flush(dev_net(dev), -1); |
1da177e4 LT |
977 | break; |
978 | case NETDEV_DOWN: | |
e2ce1468 | 979 | fib_disable_ip(dev, 0, 0); |
1da177e4 LT |
980 | break; |
981 | case NETDEV_CHANGEMTU: | |
982 | case NETDEV_CHANGE: | |
76e6ebfb | 983 | rt_cache_flush(dev_net(dev), 0); |
1da177e4 | 984 | break; |
a5ee1551 EB |
985 | case NETDEV_UNREGISTER_BATCH: |
986 | rt_cache_flush_batch(); | |
987 | break; | |
1da177e4 LT |
988 | } |
989 | return NOTIFY_DONE; | |
990 | } | |
991 | ||
992 | static struct notifier_block fib_inetaddr_notifier = { | |
6ed2533e | 993 | .notifier_call = fib_inetaddr_event, |
1da177e4 LT |
994 | }; |
995 | ||
996 | static struct notifier_block fib_netdev_notifier = { | |
6ed2533e | 997 | .notifier_call = fib_netdev_event, |
1da177e4 LT |
998 | }; |
999 | ||
7b1a74fd | 1000 | static int __net_init ip_fib_net_init(struct net *net) |
1da177e4 | 1001 | { |
dce5cbee | 1002 | int err; |
1af5a8c4 PM |
1003 | unsigned int i; |
1004 | ||
e4aef8ae DL |
1005 | net->ipv4.fib_table_hash = kzalloc( |
1006 | sizeof(struct hlist_head)*FIB_TABLE_HASHSZ, GFP_KERNEL); | |
1007 | if (net->ipv4.fib_table_hash == NULL) | |
1008 | return -ENOMEM; | |
1009 | ||
1af5a8c4 | 1010 | for (i = 0; i < FIB_TABLE_HASHSZ; i++) |
e4aef8ae | 1011 | INIT_HLIST_HEAD(&net->ipv4.fib_table_hash[i]); |
c3e9a353 | 1012 | |
dce5cbee DL |
1013 | err = fib4_rules_init(net); |
1014 | if (err < 0) | |
1015 | goto fail; | |
1016 | return 0; | |
1017 | ||
1018 | fail: | |
1019 | kfree(net->ipv4.fib_table_hash); | |
1020 | return err; | |
7b1a74fd | 1021 | } |
1da177e4 | 1022 | |
2c8c1e72 | 1023 | static void ip_fib_net_exit(struct net *net) |
7b1a74fd DL |
1024 | { |
1025 | unsigned int i; | |
1026 | ||
1027 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
1028 | fib4_rules_exit(net); | |
1029 | #endif | |
1030 | ||
1031 | for (i = 0; i < FIB_TABLE_HASHSZ; i++) { | |
1032 | struct fib_table *tb; | |
1033 | struct hlist_head *head; | |
1034 | struct hlist_node *node, *tmp; | |
63f3444f | 1035 | |
e4aef8ae | 1036 | head = &net->ipv4.fib_table_hash[i]; |
7b1a74fd DL |
1037 | hlist_for_each_entry_safe(tb, node, tmp, head, tb_hlist) { |
1038 | hlist_del(node); | |
16c6cf8b | 1039 | fib_table_flush(tb); |
7b1a74fd DL |
1040 | kfree(tb); |
1041 | } | |
1042 | } | |
e4aef8ae | 1043 | kfree(net->ipv4.fib_table_hash); |
7b1a74fd DL |
1044 | } |
1045 | ||
1046 | static int __net_init fib_net_init(struct net *net) | |
1047 | { | |
1048 | int error; | |
1049 | ||
7b1a74fd DL |
1050 | error = ip_fib_net_init(net); |
1051 | if (error < 0) | |
1052 | goto out; | |
1053 | error = nl_fib_lookup_init(net); | |
1054 | if (error < 0) | |
1055 | goto out_nlfl; | |
1056 | error = fib_proc_init(net); | |
1057 | if (error < 0) | |
1058 | goto out_proc; | |
1059 | out: | |
1060 | return error; | |
1061 | ||
1062 | out_proc: | |
1063 | nl_fib_lookup_exit(net); | |
1064 | out_nlfl: | |
1065 | ip_fib_net_exit(net); | |
1066 | goto out; | |
1067 | } | |
1068 | ||
1069 | static void __net_exit fib_net_exit(struct net *net) | |
1070 | { | |
1071 | fib_proc_exit(net); | |
1072 | nl_fib_lookup_exit(net); | |
1073 | ip_fib_net_exit(net); | |
1074 | } | |
1075 | ||
1076 | static struct pernet_operations fib_net_ops = { | |
1077 | .init = fib_net_init, | |
1078 | .exit = fib_net_exit, | |
1079 | }; | |
1080 | ||
1081 | void __init ip_fib_init(void) | |
1082 | { | |
63f3444f TG |
1083 | rtnl_register(PF_INET, RTM_NEWROUTE, inet_rtm_newroute, NULL); |
1084 | rtnl_register(PF_INET, RTM_DELROUTE, inet_rtm_delroute, NULL); | |
1085 | rtnl_register(PF_INET, RTM_GETROUTE, NULL, inet_dump_fib); | |
7b1a74fd DL |
1086 | |
1087 | register_pernet_subsys(&fib_net_ops); | |
1088 | register_netdevice_notifier(&fib_netdev_notifier); | |
1089 | register_inetaddr_notifier(&fib_inetaddr_notifier); | |
7f9b8052 SH |
1090 | |
1091 | fib_hash_init(); | |
1da177e4 | 1092 | } |