]>
Commit | Line | Data |
---|---|---|
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 | ||
82efee14 ED |
150 | /** |
151 | * __ip_dev_find - find the first device with a given source address. | |
152 | * @net: the net namespace | |
153 | * @addr: the source address | |
154 | * @devref: if true, take a reference on the found device | |
155 | * | |
9e917dca | 156 | * If a caller uses devref=false, it should be protected by RCU, or RTNL |
1da177e4 | 157 | */ |
82efee14 | 158 | struct net_device *__ip_dev_find(struct net *net, __be32 addr, bool devref) |
1da177e4 | 159 | { |
82efee14 ED |
160 | struct flowi fl = { |
161 | .nl_u = { | |
162 | .ip4_u = { | |
163 | .daddr = addr | |
164 | } | |
165 | }, | |
166 | .flags = FLOWI_FLAG_MATCH_ANY_IIF | |
167 | }; | |
168 | struct fib_result res = { 0 }; | |
1da177e4 LT |
169 | struct net_device *dev = NULL; |
170 | ||
ebc0ffae ED |
171 | rcu_read_lock(); |
172 | if (fib_lookup(net, &fl, &res)) { | |
173 | rcu_read_unlock(); | |
1da177e4 | 174 | return NULL; |
ebc0ffae | 175 | } |
1da177e4 LT |
176 | if (res.type != RTN_LOCAL) |
177 | goto out; | |
178 | dev = FIB_RES_DEV(res); | |
179 | ||
82efee14 | 180 | if (dev && devref) |
1da177e4 LT |
181 | dev_hold(dev); |
182 | out: | |
ebc0ffae | 183 | rcu_read_unlock(); |
1da177e4 LT |
184 | return dev; |
185 | } | |
82efee14 | 186 | EXPORT_SYMBOL(__ip_dev_find); |
1da177e4 | 187 | |
05538116 LAT |
188 | /* |
189 | * Find address type as if only "dev" was present in the system. If | |
190 | * on_dev is NULL then all interfaces are taken into consideration. | |
191 | */ | |
6b175b26 EB |
192 | static inline unsigned __inet_dev_addr_type(struct net *net, |
193 | const struct net_device *dev, | |
05538116 | 194 | __be32 addr) |
1da177e4 LT |
195 | { |
196 | struct flowi fl = { .nl_u = { .ip4_u = { .daddr = addr } } }; | |
197 | struct fib_result res; | |
198 | unsigned ret = RTN_BROADCAST; | |
03cf786c | 199 | struct fib_table *local_table; |
1da177e4 | 200 | |
1e637c74 | 201 | if (ipv4_is_zeronet(addr) || ipv4_is_lbcast(addr)) |
1da177e4 | 202 | return RTN_BROADCAST; |
f97c1e0c | 203 | if (ipv4_is_multicast(addr)) |
1da177e4 LT |
204 | return RTN_MULTICAST; |
205 | ||
206 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
207 | res.r = NULL; | |
208 | #endif | |
e905a9ed | 209 | |
6b175b26 | 210 | local_table = fib_get_table(net, RT_TABLE_LOCAL); |
03cf786c | 211 | if (local_table) { |
1da177e4 | 212 | ret = RTN_UNICAST; |
ebc0ffae ED |
213 | rcu_read_lock(); |
214 | if (!fib_table_lookup(local_table, &fl, &res, FIB_LOOKUP_NOREF)) { | |
05538116 LAT |
215 | if (!dev || dev == res.fi->fib_dev) |
216 | ret = res.type; | |
1da177e4 | 217 | } |
ebc0ffae | 218 | rcu_read_unlock(); |
1da177e4 LT |
219 | } |
220 | return ret; | |
221 | } | |
222 | ||
6b175b26 | 223 | unsigned int inet_addr_type(struct net *net, __be32 addr) |
05538116 | 224 | { |
6b175b26 | 225 | return __inet_dev_addr_type(net, NULL, addr); |
05538116 | 226 | } |
4bc2f18b | 227 | EXPORT_SYMBOL(inet_addr_type); |
05538116 | 228 | |
6b175b26 EB |
229 | unsigned int inet_dev_addr_type(struct net *net, const struct net_device *dev, |
230 | __be32 addr) | |
05538116 | 231 | { |
6a31d2a9 | 232 | return __inet_dev_addr_type(net, dev, addr); |
05538116 | 233 | } |
4bc2f18b | 234 | EXPORT_SYMBOL(inet_dev_addr_type); |
05538116 | 235 | |
1da177e4 | 236 | /* Given (packet source, input interface) and optional (dst, oif, tos): |
6a31d2a9 ED |
237 | * - (main) check, that source is valid i.e. not broadcast or our local |
238 | * address. | |
239 | * - figure out what "logical" interface this packet arrived | |
240 | * and calculate "specific destination" address. | |
241 | * - check, that packet arrived from expected physical interface. | |
ebc0ffae | 242 | * called with rcu_read_lock() |
1da177e4 | 243 | */ |
d9c9df8c | 244 | int fib_validate_source(__be32 src, __be32 dst, u8 tos, int oif, |
b0c110ca | 245 | struct net_device *dev, __be32 *spec_dst, |
246 | u32 *itag, u32 mark) | |
1da177e4 LT |
247 | { |
248 | struct in_device *in_dev; | |
6a31d2a9 ED |
249 | struct flowi fl = { |
250 | .nl_u = { | |
251 | .ip4_u = { | |
252 | .daddr = src, | |
253 | .saddr = dst, | |
254 | .tos = tos | |
255 | } | |
256 | }, | |
257 | .mark = mark, | |
258 | .iif = oif | |
259 | }; | |
1da177e4 | 260 | struct fib_result res; |
8153a10c | 261 | int no_addr, rpf, accept_local; |
6f86b325 | 262 | bool dev_match; |
1da177e4 | 263 | int ret; |
5b707aaa | 264 | struct net *net; |
1da177e4 | 265 | |
8153a10c | 266 | no_addr = rpf = accept_local = 0; |
e5ed6399 | 267 | in_dev = __in_dev_get_rcu(dev); |
1da177e4 LT |
268 | if (in_dev) { |
269 | no_addr = in_dev->ifa_list == NULL; | |
270 | rpf = IN_DEV_RPFILTER(in_dev); | |
8153a10c | 271 | accept_local = IN_DEV_ACCEPT_LOCAL(in_dev); |
28f6aeea JHS |
272 | if (mark && !IN_DEV_SRC_VMARK(in_dev)) |
273 | fl.mark = 0; | |
1da177e4 | 274 | } |
1da177e4 LT |
275 | |
276 | if (in_dev == NULL) | |
277 | goto e_inval; | |
278 | ||
c346dca1 | 279 | net = dev_net(dev); |
5b707aaa | 280 | if (fib_lookup(net, &fl, &res)) |
1da177e4 | 281 | goto last_resort; |
8153a10c PM |
282 | if (res.type != RTN_UNICAST) { |
283 | if (res.type != RTN_LOCAL || !accept_local) | |
ebc0ffae | 284 | goto e_inval; |
8153a10c | 285 | } |
1da177e4 LT |
286 | *spec_dst = FIB_RES_PREFSRC(res); |
287 | fib_combine_itag(itag, &res); | |
6f86b325 DM |
288 | dev_match = false; |
289 | ||
1da177e4 | 290 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
6f86b325 DM |
291 | for (ret = 0; ret < res.fi->fib_nhs; ret++) { |
292 | struct fib_nh *nh = &res.fi->fib_nh[ret]; | |
293 | ||
294 | if (nh->nh_dev == dev) { | |
295 | dev_match = true; | |
296 | break; | |
297 | } | |
298 | } | |
1da177e4 LT |
299 | #else |
300 | if (FIB_RES_DEV(res) == dev) | |
6f86b325 | 301 | dev_match = true; |
1da177e4 | 302 | #endif |
6f86b325 | 303 | if (dev_match) { |
1da177e4 | 304 | ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST; |
1da177e4 LT |
305 | return ret; |
306 | } | |
1da177e4 LT |
307 | if (no_addr) |
308 | goto last_resort; | |
c1cf8422 | 309 | if (rpf == 1) |
b5f7e755 | 310 | goto e_rpf; |
1da177e4 LT |
311 | fl.oif = dev->ifindex; |
312 | ||
313 | ret = 0; | |
5b707aaa | 314 | if (fib_lookup(net, &fl, &res) == 0) { |
1da177e4 LT |
315 | if (res.type == RTN_UNICAST) { |
316 | *spec_dst = FIB_RES_PREFSRC(res); | |
317 | ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST; | |
318 | } | |
1da177e4 LT |
319 | } |
320 | return ret; | |
321 | ||
322 | last_resort: | |
323 | if (rpf) | |
b5f7e755 | 324 | goto e_rpf; |
1da177e4 LT |
325 | *spec_dst = inet_select_addr(dev, 0, RT_SCOPE_UNIVERSE); |
326 | *itag = 0; | |
327 | return 0; | |
328 | ||
1da177e4 LT |
329 | e_inval: |
330 | return -EINVAL; | |
b5f7e755 ED |
331 | e_rpf: |
332 | return -EXDEV; | |
1da177e4 LT |
333 | } |
334 | ||
81f7bf6c | 335 | static inline __be32 sk_extract_addr(struct sockaddr *addr) |
4e902c57 TG |
336 | { |
337 | return ((struct sockaddr_in *) addr)->sin_addr.s_addr; | |
338 | } | |
339 | ||
340 | static int put_rtax(struct nlattr *mx, int len, int type, u32 value) | |
341 | { | |
342 | struct nlattr *nla; | |
343 | ||
344 | nla = (struct nlattr *) ((char *) mx + len); | |
345 | nla->nla_type = type; | |
346 | nla->nla_len = nla_attr_size(4); | |
347 | *(u32 *) nla_data(nla) = value; | |
348 | ||
349 | return len + nla_total_size(4); | |
350 | } | |
351 | ||
4b5d47d4 | 352 | static int rtentry_to_fib_config(struct net *net, int cmd, struct rtentry *rt, |
4e902c57 TG |
353 | struct fib_config *cfg) |
354 | { | |
6d85c10a | 355 | __be32 addr; |
4e902c57 TG |
356 | int plen; |
357 | ||
358 | memset(cfg, 0, sizeof(*cfg)); | |
4b5d47d4 | 359 | cfg->fc_nlinfo.nl_net = net; |
4e902c57 TG |
360 | |
361 | if (rt->rt_dst.sa_family != AF_INET) | |
362 | return -EAFNOSUPPORT; | |
363 | ||
364 | /* | |
365 | * Check mask for validity: | |
366 | * a) it must be contiguous. | |
367 | * b) destination must have all host bits clear. | |
368 | * c) if application forgot to set correct family (AF_INET), | |
369 | * reject request unless it is absolutely clear i.e. | |
370 | * both family and mask are zero. | |
371 | */ | |
372 | plen = 32; | |
373 | addr = sk_extract_addr(&rt->rt_dst); | |
374 | if (!(rt->rt_flags & RTF_HOST)) { | |
81f7bf6c | 375 | __be32 mask = sk_extract_addr(&rt->rt_genmask); |
4e902c57 TG |
376 | |
377 | if (rt->rt_genmask.sa_family != AF_INET) { | |
378 | if (mask || rt->rt_genmask.sa_family) | |
379 | return -EAFNOSUPPORT; | |
380 | } | |
381 | ||
382 | if (bad_mask(mask, addr)) | |
383 | return -EINVAL; | |
384 | ||
385 | plen = inet_mask_len(mask); | |
386 | } | |
387 | ||
388 | cfg->fc_dst_len = plen; | |
389 | cfg->fc_dst = addr; | |
390 | ||
391 | if (cmd != SIOCDELRT) { | |
392 | cfg->fc_nlflags = NLM_F_CREATE; | |
393 | cfg->fc_protocol = RTPROT_BOOT; | |
394 | } | |
395 | ||
396 | if (rt->rt_metric) | |
397 | cfg->fc_priority = rt->rt_metric - 1; | |
398 | ||
399 | if (rt->rt_flags & RTF_REJECT) { | |
400 | cfg->fc_scope = RT_SCOPE_HOST; | |
401 | cfg->fc_type = RTN_UNREACHABLE; | |
402 | return 0; | |
403 | } | |
404 | ||
405 | cfg->fc_scope = RT_SCOPE_NOWHERE; | |
406 | cfg->fc_type = RTN_UNICAST; | |
407 | ||
408 | if (rt->rt_dev) { | |
409 | char *colon; | |
410 | struct net_device *dev; | |
411 | char devname[IFNAMSIZ]; | |
412 | ||
413 | if (copy_from_user(devname, rt->rt_dev, IFNAMSIZ-1)) | |
414 | return -EFAULT; | |
415 | ||
416 | devname[IFNAMSIZ-1] = 0; | |
417 | colon = strchr(devname, ':'); | |
418 | if (colon) | |
419 | *colon = 0; | |
4b5d47d4 | 420 | dev = __dev_get_by_name(net, devname); |
4e902c57 TG |
421 | if (!dev) |
422 | return -ENODEV; | |
423 | cfg->fc_oif = dev->ifindex; | |
424 | if (colon) { | |
425 | struct in_ifaddr *ifa; | |
426 | struct in_device *in_dev = __in_dev_get_rtnl(dev); | |
427 | if (!in_dev) | |
428 | return -ENODEV; | |
429 | *colon = ':'; | |
430 | for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) | |
431 | if (strcmp(ifa->ifa_label, devname) == 0) | |
432 | break; | |
433 | if (ifa == NULL) | |
434 | return -ENODEV; | |
435 | cfg->fc_prefsrc = ifa->ifa_local; | |
436 | } | |
437 | } | |
438 | ||
439 | addr = sk_extract_addr(&rt->rt_gateway); | |
440 | if (rt->rt_gateway.sa_family == AF_INET && addr) { | |
441 | cfg->fc_gw = addr; | |
442 | if (rt->rt_flags & RTF_GATEWAY && | |
4b5d47d4 | 443 | inet_addr_type(net, addr) == RTN_UNICAST) |
4e902c57 TG |
444 | cfg->fc_scope = RT_SCOPE_UNIVERSE; |
445 | } | |
446 | ||
447 | if (cmd == SIOCDELRT) | |
448 | return 0; | |
449 | ||
450 | if (rt->rt_flags & RTF_GATEWAY && !cfg->fc_gw) | |
451 | return -EINVAL; | |
452 | ||
453 | if (cfg->fc_scope == RT_SCOPE_NOWHERE) | |
454 | cfg->fc_scope = RT_SCOPE_LINK; | |
455 | ||
456 | if (rt->rt_flags & (RTF_MTU | RTF_WINDOW | RTF_IRTT)) { | |
457 | struct nlattr *mx; | |
458 | int len = 0; | |
459 | ||
460 | mx = kzalloc(3 * nla_total_size(4), GFP_KERNEL); | |
e905a9ed | 461 | if (mx == NULL) |
4e902c57 TG |
462 | return -ENOMEM; |
463 | ||
464 | if (rt->rt_flags & RTF_MTU) | |
465 | len = put_rtax(mx, len, RTAX_ADVMSS, rt->rt_mtu - 40); | |
466 | ||
467 | if (rt->rt_flags & RTF_WINDOW) | |
468 | len = put_rtax(mx, len, RTAX_WINDOW, rt->rt_window); | |
469 | ||
470 | if (rt->rt_flags & RTF_IRTT) | |
471 | len = put_rtax(mx, len, RTAX_RTT, rt->rt_irtt << 3); | |
472 | ||
473 | cfg->fc_mx = mx; | |
474 | cfg->fc_mx_len = len; | |
475 | } | |
476 | ||
477 | return 0; | |
478 | } | |
479 | ||
1da177e4 | 480 | /* |
6a31d2a9 ED |
481 | * Handle IP routing ioctl calls. |
482 | * These are used to manipulate the routing tables | |
1da177e4 | 483 | */ |
1bad118a | 484 | int ip_rt_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
1da177e4 | 485 | { |
4e902c57 TG |
486 | struct fib_config cfg; |
487 | struct rtentry rt; | |
1da177e4 | 488 | int err; |
1da177e4 LT |
489 | |
490 | switch (cmd) { | |
491 | case SIOCADDRT: /* Add a route */ | |
492 | case SIOCDELRT: /* Delete a route */ | |
493 | if (!capable(CAP_NET_ADMIN)) | |
494 | return -EPERM; | |
4e902c57 TG |
495 | |
496 | if (copy_from_user(&rt, arg, sizeof(rt))) | |
1da177e4 | 497 | return -EFAULT; |
4e902c57 | 498 | |
1da177e4 | 499 | rtnl_lock(); |
1bad118a | 500 | err = rtentry_to_fib_config(net, cmd, &rt, &cfg); |
1da177e4 | 501 | if (err == 0) { |
4e902c57 TG |
502 | struct fib_table *tb; |
503 | ||
1da177e4 | 504 | if (cmd == SIOCDELRT) { |
1bad118a | 505 | tb = fib_get_table(net, cfg.fc_table); |
1da177e4 | 506 | if (tb) |
16c6cf8b | 507 | err = fib_table_delete(tb, &cfg); |
4e902c57 TG |
508 | else |
509 | err = -ESRCH; | |
1da177e4 | 510 | } else { |
1bad118a | 511 | tb = fib_new_table(net, cfg.fc_table); |
1da177e4 | 512 | if (tb) |
16c6cf8b | 513 | err = fib_table_insert(tb, &cfg); |
4e902c57 TG |
514 | else |
515 | err = -ENOBUFS; | |
1da177e4 | 516 | } |
4e902c57 TG |
517 | |
518 | /* allocated by rtentry_to_fib_config() */ | |
519 | kfree(cfg.fc_mx); | |
1da177e4 LT |
520 | } |
521 | rtnl_unlock(); | |
522 | return err; | |
523 | } | |
524 | return -EINVAL; | |
525 | } | |
526 | ||
6a31d2a9 | 527 | const struct nla_policy rtm_ipv4_policy[RTA_MAX + 1] = { |
4e902c57 TG |
528 | [RTA_DST] = { .type = NLA_U32 }, |
529 | [RTA_SRC] = { .type = NLA_U32 }, | |
530 | [RTA_IIF] = { .type = NLA_U32 }, | |
531 | [RTA_OIF] = { .type = NLA_U32 }, | |
532 | [RTA_GATEWAY] = { .type = NLA_U32 }, | |
533 | [RTA_PRIORITY] = { .type = NLA_U32 }, | |
534 | [RTA_PREFSRC] = { .type = NLA_U32 }, | |
535 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
5176f91e | 536 | [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) }, |
4e902c57 | 537 | [RTA_FLOW] = { .type = NLA_U32 }, |
4e902c57 TG |
538 | }; |
539 | ||
4b5d47d4 | 540 | static int rtm_to_fib_config(struct net *net, struct sk_buff *skb, |
6a31d2a9 | 541 | struct nlmsghdr *nlh, struct fib_config *cfg) |
1da177e4 | 542 | { |
4e902c57 TG |
543 | struct nlattr *attr; |
544 | int err, remaining; | |
545 | struct rtmsg *rtm; | |
546 | ||
547 | err = nlmsg_validate(nlh, sizeof(*rtm), RTA_MAX, rtm_ipv4_policy); | |
548 | if (err < 0) | |
549 | goto errout; | |
550 | ||
551 | memset(cfg, 0, sizeof(*cfg)); | |
552 | ||
553 | rtm = nlmsg_data(nlh); | |
4e902c57 | 554 | cfg->fc_dst_len = rtm->rtm_dst_len; |
4e902c57 TG |
555 | cfg->fc_tos = rtm->rtm_tos; |
556 | cfg->fc_table = rtm->rtm_table; | |
557 | cfg->fc_protocol = rtm->rtm_protocol; | |
558 | cfg->fc_scope = rtm->rtm_scope; | |
559 | cfg->fc_type = rtm->rtm_type; | |
560 | cfg->fc_flags = rtm->rtm_flags; | |
561 | cfg->fc_nlflags = nlh->nlmsg_flags; | |
562 | ||
563 | cfg->fc_nlinfo.pid = NETLINK_CB(skb).pid; | |
564 | cfg->fc_nlinfo.nlh = nlh; | |
4b5d47d4 | 565 | cfg->fc_nlinfo.nl_net = net; |
4e902c57 | 566 | |
a0ee18b9 TG |
567 | if (cfg->fc_type > RTN_MAX) { |
568 | err = -EINVAL; | |
569 | goto errout; | |
570 | } | |
571 | ||
4e902c57 | 572 | nlmsg_for_each_attr(attr, nlh, sizeof(struct rtmsg), remaining) { |
8f4c1f9b | 573 | switch (nla_type(attr)) { |
4e902c57 | 574 | case RTA_DST: |
17fb2c64 | 575 | cfg->fc_dst = nla_get_be32(attr); |
4e902c57 | 576 | break; |
4e902c57 TG |
577 | case RTA_OIF: |
578 | cfg->fc_oif = nla_get_u32(attr); | |
579 | break; | |
580 | case RTA_GATEWAY: | |
17fb2c64 | 581 | cfg->fc_gw = nla_get_be32(attr); |
4e902c57 TG |
582 | break; |
583 | case RTA_PRIORITY: | |
584 | cfg->fc_priority = nla_get_u32(attr); | |
585 | break; | |
586 | case RTA_PREFSRC: | |
17fb2c64 | 587 | cfg->fc_prefsrc = nla_get_be32(attr); |
4e902c57 TG |
588 | break; |
589 | case RTA_METRICS: | |
590 | cfg->fc_mx = nla_data(attr); | |
591 | cfg->fc_mx_len = nla_len(attr); | |
592 | break; | |
593 | case RTA_MULTIPATH: | |
594 | cfg->fc_mp = nla_data(attr); | |
595 | cfg->fc_mp_len = nla_len(attr); | |
596 | break; | |
597 | case RTA_FLOW: | |
598 | cfg->fc_flow = nla_get_u32(attr); | |
599 | break; | |
4e902c57 TG |
600 | case RTA_TABLE: |
601 | cfg->fc_table = nla_get_u32(attr); | |
602 | break; | |
1da177e4 LT |
603 | } |
604 | } | |
4e902c57 | 605 | |
1da177e4 | 606 | return 0; |
4e902c57 TG |
607 | errout: |
608 | return err; | |
1da177e4 LT |
609 | } |
610 | ||
6ed2533e | 611 | static int inet_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) |
1da177e4 | 612 | { |
3b1e0a65 | 613 | struct net *net = sock_net(skb->sk); |
4e902c57 TG |
614 | struct fib_config cfg; |
615 | struct fib_table *tb; | |
616 | int err; | |
1da177e4 | 617 | |
4b5d47d4 | 618 | err = rtm_to_fib_config(net, skb, nlh, &cfg); |
4e902c57 TG |
619 | if (err < 0) |
620 | goto errout; | |
1da177e4 | 621 | |
8ad4942c | 622 | tb = fib_get_table(net, cfg.fc_table); |
4e902c57 TG |
623 | if (tb == NULL) { |
624 | err = -ESRCH; | |
625 | goto errout; | |
626 | } | |
627 | ||
16c6cf8b | 628 | err = fib_table_delete(tb, &cfg); |
4e902c57 TG |
629 | errout: |
630 | return err; | |
1da177e4 LT |
631 | } |
632 | ||
6ed2533e | 633 | static int inet_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) |
1da177e4 | 634 | { |
3b1e0a65 | 635 | struct net *net = sock_net(skb->sk); |
4e902c57 TG |
636 | struct fib_config cfg; |
637 | struct fib_table *tb; | |
638 | int err; | |
1da177e4 | 639 | |
4b5d47d4 | 640 | err = rtm_to_fib_config(net, skb, nlh, &cfg); |
4e902c57 TG |
641 | if (err < 0) |
642 | goto errout; | |
1da177e4 | 643 | |
226b0b4a | 644 | tb = fib_new_table(net, cfg.fc_table); |
4e902c57 TG |
645 | if (tb == NULL) { |
646 | err = -ENOBUFS; | |
647 | goto errout; | |
648 | } | |
649 | ||
16c6cf8b | 650 | err = fib_table_insert(tb, &cfg); |
4e902c57 TG |
651 | errout: |
652 | return err; | |
1da177e4 LT |
653 | } |
654 | ||
63f3444f | 655 | static int inet_dump_fib(struct sk_buff *skb, struct netlink_callback *cb) |
1da177e4 | 656 | { |
3b1e0a65 | 657 | struct net *net = sock_net(skb->sk); |
1af5a8c4 PM |
658 | unsigned int h, s_h; |
659 | unsigned int e = 0, s_e; | |
1da177e4 | 660 | struct fib_table *tb; |
1af5a8c4 | 661 | struct hlist_node *node; |
e4aef8ae | 662 | struct hlist_head *head; |
1af5a8c4 | 663 | int dumped = 0; |
1da177e4 | 664 | |
be403ea1 TG |
665 | if (nlmsg_len(cb->nlh) >= sizeof(struct rtmsg) && |
666 | ((struct rtmsg *) nlmsg_data(cb->nlh))->rtm_flags & RTM_F_CLONED) | |
1da177e4 LT |
667 | return ip_rt_dump(skb, cb); |
668 | ||
1af5a8c4 PM |
669 | s_h = cb->args[0]; |
670 | s_e = cb->args[1]; | |
671 | ||
672 | for (h = s_h; h < FIB_TABLE_HASHSZ; h++, s_e = 0) { | |
673 | e = 0; | |
e4aef8ae DL |
674 | head = &net->ipv4.fib_table_hash[h]; |
675 | hlist_for_each_entry(tb, node, head, tb_hlist) { | |
1af5a8c4 PM |
676 | if (e < s_e) |
677 | goto next; | |
678 | if (dumped) | |
679 | memset(&cb->args[2], 0, sizeof(cb->args) - | |
e905a9ed | 680 | 2 * sizeof(cb->args[0])); |
16c6cf8b | 681 | if (fib_table_dump(tb, skb, cb) < 0) |
1af5a8c4 PM |
682 | goto out; |
683 | dumped = 1; | |
684 | next: | |
685 | e++; | |
686 | } | |
1da177e4 | 687 | } |
1af5a8c4 PM |
688 | out: |
689 | cb->args[1] = e; | |
690 | cb->args[0] = h; | |
1da177e4 LT |
691 | |
692 | return skb->len; | |
693 | } | |
694 | ||
695 | /* Prepare and feed intra-kernel routing request. | |
6a31d2a9 ED |
696 | * Really, it should be netlink message, but :-( netlink |
697 | * can be not configured, so that we feed it directly | |
698 | * to fib engine. It is legal, because all events occur | |
699 | * only when netlink is already locked. | |
1da177e4 | 700 | */ |
81f7bf6c | 701 | static void fib_magic(int cmd, int type, __be32 dst, int dst_len, struct in_ifaddr *ifa) |
1da177e4 | 702 | { |
c346dca1 | 703 | struct net *net = dev_net(ifa->ifa_dev->dev); |
4e902c57 TG |
704 | struct fib_table *tb; |
705 | struct fib_config cfg = { | |
706 | .fc_protocol = RTPROT_KERNEL, | |
707 | .fc_type = type, | |
708 | .fc_dst = dst, | |
709 | .fc_dst_len = dst_len, | |
710 | .fc_prefsrc = ifa->ifa_local, | |
711 | .fc_oif = ifa->ifa_dev->dev->ifindex, | |
712 | .fc_nlflags = NLM_F_CREATE | NLM_F_APPEND, | |
4d1169c1 | 713 | .fc_nlinfo = { |
4b5d47d4 | 714 | .nl_net = net, |
4d1169c1 | 715 | }, |
4e902c57 | 716 | }; |
1da177e4 LT |
717 | |
718 | if (type == RTN_UNICAST) | |
4b5d47d4 | 719 | tb = fib_new_table(net, RT_TABLE_MAIN); |
1da177e4 | 720 | else |
4b5d47d4 | 721 | tb = fib_new_table(net, RT_TABLE_LOCAL); |
1da177e4 LT |
722 | |
723 | if (tb == NULL) | |
724 | return; | |
725 | ||
4e902c57 | 726 | cfg.fc_table = tb->tb_id; |
1da177e4 | 727 | |
4e902c57 TG |
728 | if (type != RTN_LOCAL) |
729 | cfg.fc_scope = RT_SCOPE_LINK; | |
730 | else | |
731 | cfg.fc_scope = RT_SCOPE_HOST; | |
1da177e4 LT |
732 | |
733 | if (cmd == RTM_NEWROUTE) | |
16c6cf8b | 734 | fib_table_insert(tb, &cfg); |
1da177e4 | 735 | else |
16c6cf8b | 736 | fib_table_delete(tb, &cfg); |
1da177e4 LT |
737 | } |
738 | ||
0ff60a45 | 739 | void fib_add_ifaddr(struct in_ifaddr *ifa) |
1da177e4 LT |
740 | { |
741 | struct in_device *in_dev = ifa->ifa_dev; | |
742 | struct net_device *dev = in_dev->dev; | |
743 | struct in_ifaddr *prim = ifa; | |
a144ea4b AV |
744 | __be32 mask = ifa->ifa_mask; |
745 | __be32 addr = ifa->ifa_local; | |
6a31d2a9 | 746 | __be32 prefix = ifa->ifa_address & mask; |
1da177e4 | 747 | |
6a31d2a9 | 748 | if (ifa->ifa_flags & IFA_F_SECONDARY) { |
1da177e4 LT |
749 | prim = inet_ifa_byprefix(in_dev, prefix, mask); |
750 | if (prim == NULL) { | |
a6db9010 | 751 | printk(KERN_WARNING "fib_add_ifaddr: bug: prim == NULL\n"); |
1da177e4 LT |
752 | return; |
753 | } | |
754 | } | |
755 | ||
756 | fib_magic(RTM_NEWROUTE, RTN_LOCAL, addr, 32, prim); | |
757 | ||
6a31d2a9 | 758 | if (!(dev->flags & IFF_UP)) |
1da177e4 LT |
759 | return; |
760 | ||
761 | /* Add broadcast address, if it is explicitly assigned. */ | |
a144ea4b | 762 | if (ifa->ifa_broadcast && ifa->ifa_broadcast != htonl(0xFFFFFFFF)) |
1da177e4 LT |
763 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim); |
764 | ||
6a31d2a9 | 765 | if (!ipv4_is_zeronet(prefix) && !(ifa->ifa_flags & IFA_F_SECONDARY) && |
1da177e4 | 766 | (prefix != addr || ifa->ifa_prefixlen < 32)) { |
6a31d2a9 ED |
767 | fib_magic(RTM_NEWROUTE, |
768 | dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST, | |
769 | prefix, ifa->ifa_prefixlen, prim); | |
1da177e4 LT |
770 | |
771 | /* Add network specific broadcasts, when it takes a sense */ | |
772 | if (ifa->ifa_prefixlen < 31) { | |
773 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix, 32, prim); | |
6a31d2a9 ED |
774 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix | ~mask, |
775 | 32, prim); | |
1da177e4 LT |
776 | } |
777 | } | |
778 | } | |
779 | ||
780 | static void fib_del_ifaddr(struct in_ifaddr *ifa) | |
781 | { | |
782 | struct in_device *in_dev = ifa->ifa_dev; | |
783 | struct net_device *dev = in_dev->dev; | |
784 | struct in_ifaddr *ifa1; | |
785 | struct in_ifaddr *prim = ifa; | |
6a31d2a9 ED |
786 | __be32 brd = ifa->ifa_address | ~ifa->ifa_mask; |
787 | __be32 any = ifa->ifa_address & ifa->ifa_mask; | |
1da177e4 LT |
788 | #define LOCAL_OK 1 |
789 | #define BRD_OK 2 | |
790 | #define BRD0_OK 4 | |
791 | #define BRD1_OK 8 | |
792 | unsigned ok = 0; | |
793 | ||
6a31d2a9 ED |
794 | if (!(ifa->ifa_flags & IFA_F_SECONDARY)) |
795 | fib_magic(RTM_DELROUTE, | |
796 | dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST, | |
797 | any, ifa->ifa_prefixlen, prim); | |
1da177e4 LT |
798 | else { |
799 | prim = inet_ifa_byprefix(in_dev, any, ifa->ifa_mask); | |
800 | if (prim == NULL) { | |
a6db9010 | 801 | printk(KERN_WARNING "fib_del_ifaddr: bug: prim == NULL\n"); |
1da177e4 LT |
802 | return; |
803 | } | |
804 | } | |
805 | ||
806 | /* Deletion is more complicated than add. | |
6a31d2a9 ED |
807 | * We should take care of not to delete too much :-) |
808 | * | |
809 | * Scan address list to be sure that addresses are really gone. | |
1da177e4 LT |
810 | */ |
811 | ||
812 | for (ifa1 = in_dev->ifa_list; ifa1; ifa1 = ifa1->ifa_next) { | |
813 | if (ifa->ifa_local == ifa1->ifa_local) | |
814 | ok |= LOCAL_OK; | |
815 | if (ifa->ifa_broadcast == ifa1->ifa_broadcast) | |
816 | ok |= BRD_OK; | |
817 | if (brd == ifa1->ifa_broadcast) | |
818 | ok |= BRD1_OK; | |
819 | if (any == ifa1->ifa_broadcast) | |
820 | ok |= BRD0_OK; | |
821 | } | |
822 | ||
6a31d2a9 | 823 | if (!(ok & BRD_OK)) |
1da177e4 | 824 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim); |
6a31d2a9 | 825 | if (!(ok & BRD1_OK)) |
1da177e4 | 826 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, brd, 32, prim); |
6a31d2a9 | 827 | if (!(ok & BRD0_OK)) |
1da177e4 | 828 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, any, 32, prim); |
6a31d2a9 | 829 | if (!(ok & LOCAL_OK)) { |
1da177e4 LT |
830 | fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 32, prim); |
831 | ||
832 | /* Check, that this local address finally disappeared. */ | |
c346dca1 | 833 | if (inet_addr_type(dev_net(dev), ifa->ifa_local) != RTN_LOCAL) { |
1da177e4 | 834 | /* And the last, but not the least thing. |
6a31d2a9 ED |
835 | * We must flush stray FIB entries. |
836 | * | |
837 | * First of all, we scan fib_info list searching | |
838 | * for stray nexthop entries, then ignite fib_flush. | |
839 | */ | |
c346dca1 YH |
840 | if (fib_sync_down_addr(dev_net(dev), ifa->ifa_local)) |
841 | fib_flush(dev_net(dev)); | |
1da177e4 LT |
842 | } |
843 | } | |
844 | #undef LOCAL_OK | |
845 | #undef BRD_OK | |
846 | #undef BRD0_OK | |
847 | #undef BRD1_OK | |
848 | } | |
849 | ||
6a31d2a9 | 850 | static void nl_fib_lookup(struct fib_result_nl *frn, struct fib_table *tb) |
246955fe | 851 | { |
e905a9ed | 852 | |
246955fe | 853 | struct fib_result res; |
6a31d2a9 ED |
854 | struct flowi fl = { |
855 | .mark = frn->fl_mark, | |
856 | .nl_u = { | |
857 | .ip4_u = { | |
858 | .daddr = frn->fl_addr, | |
859 | .tos = frn->fl_tos, | |
860 | .scope = frn->fl_scope | |
861 | } | |
862 | } | |
863 | }; | |
1194ed0a | 864 | |
912a41a4 SV |
865 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
866 | res.r = NULL; | |
867 | #endif | |
868 | ||
1194ed0a | 869 | frn->err = -ENOENT; |
246955fe RO |
870 | if (tb) { |
871 | local_bh_disable(); | |
872 | ||
873 | frn->tb_id = tb->tb_id; | |
ebc0ffae ED |
874 | rcu_read_lock(); |
875 | frn->err = fib_table_lookup(tb, &fl, &res, FIB_LOOKUP_NOREF); | |
246955fe RO |
876 | |
877 | if (!frn->err) { | |
878 | frn->prefixlen = res.prefixlen; | |
879 | frn->nh_sel = res.nh_sel; | |
880 | frn->type = res.type; | |
881 | frn->scope = res.scope; | |
882 | } | |
ebc0ffae | 883 | rcu_read_unlock(); |
246955fe RO |
884 | local_bh_enable(); |
885 | } | |
886 | } | |
887 | ||
28f7b036 | 888 | static void nl_fib_input(struct sk_buff *skb) |
246955fe | 889 | { |
6bd48fcf | 890 | struct net *net; |
246955fe | 891 | struct fib_result_nl *frn; |
28f7b036 | 892 | struct nlmsghdr *nlh; |
246955fe | 893 | struct fib_table *tb; |
28f7b036 | 894 | u32 pid; |
1194ed0a | 895 | |
3b1e0a65 | 896 | net = sock_net(skb->sk); |
b529ccf2 | 897 | nlh = nlmsg_hdr(skb); |
ea86575e | 898 | if (skb->len < NLMSG_SPACE(0) || skb->len < nlh->nlmsg_len || |
d883a036 | 899 | nlh->nlmsg_len < NLMSG_LENGTH(sizeof(*frn))) |
ea86575e | 900 | return; |
d883a036 DL |
901 | |
902 | skb = skb_clone(skb, GFP_KERNEL); | |
903 | if (skb == NULL) | |
904 | return; | |
905 | nlh = nlmsg_hdr(skb); | |
e905a9ed | 906 | |
246955fe | 907 | frn = (struct fib_result_nl *) NLMSG_DATA(nlh); |
6bd48fcf | 908 | tb = fib_get_table(net, frn->tb_id_in); |
246955fe RO |
909 | |
910 | nl_fib_lookup(frn, tb); | |
e905a9ed | 911 | |
6a31d2a9 ED |
912 | pid = NETLINK_CB(skb).pid; /* pid of sending process */ |
913 | NETLINK_CB(skb).pid = 0; /* from kernel */ | |
ac6d439d | 914 | NETLINK_CB(skb).dst_group = 0; /* unicast */ |
6bd48fcf | 915 | netlink_unicast(net->ipv4.fibnl, skb, pid, MSG_DONTWAIT); |
e905a9ed | 916 | } |
246955fe | 917 | |
2c8c1e72 | 918 | static int __net_init nl_fib_lookup_init(struct net *net) |
246955fe | 919 | { |
6bd48fcf DL |
920 | struct sock *sk; |
921 | sk = netlink_kernel_create(net, NETLINK_FIB_LOOKUP, 0, | |
922 | nl_fib_input, NULL, THIS_MODULE); | |
923 | if (sk == NULL) | |
7b1a74fd | 924 | return -EAFNOSUPPORT; |
6bd48fcf | 925 | net->ipv4.fibnl = sk; |
7b1a74fd DL |
926 | return 0; |
927 | } | |
928 | ||
929 | static void nl_fib_lookup_exit(struct net *net) | |
930 | { | |
b7c6ba6e | 931 | netlink_kernel_release(net->ipv4.fibnl); |
775516bf | 932 | net->ipv4.fibnl = NULL; |
246955fe RO |
933 | } |
934 | ||
e2ce1468 | 935 | static void fib_disable_ip(struct net_device *dev, int force, int delay) |
1da177e4 | 936 | { |
85326fa5 | 937 | if (fib_sync_down_dev(dev, force)) |
c346dca1 | 938 | fib_flush(dev_net(dev)); |
e2ce1468 | 939 | rt_cache_flush(dev_net(dev), delay); |
1da177e4 LT |
940 | arp_ifdown(dev); |
941 | } | |
942 | ||
943 | static int fib_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr) | |
944 | { | |
6ed2533e | 945 | struct in_ifaddr *ifa = (struct in_ifaddr *)ptr; |
76e6ebfb | 946 | struct net_device *dev = ifa->ifa_dev->dev; |
1da177e4 LT |
947 | |
948 | switch (event) { | |
949 | case NETDEV_UP: | |
950 | fib_add_ifaddr(ifa); | |
951 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
76e6ebfb | 952 | fib_sync_up(dev); |
1da177e4 | 953 | #endif |
76e6ebfb | 954 | rt_cache_flush(dev_net(dev), -1); |
1da177e4 LT |
955 | break; |
956 | case NETDEV_DOWN: | |
957 | fib_del_ifaddr(ifa); | |
9fcc2e8a | 958 | if (ifa->ifa_dev->ifa_list == NULL) { |
1da177e4 | 959 | /* Last address was deleted from this interface. |
6a31d2a9 | 960 | * Disable IP. |
1da177e4 | 961 | */ |
e2ce1468 | 962 | fib_disable_ip(dev, 1, 0); |
1da177e4 | 963 | } else { |
76e6ebfb | 964 | rt_cache_flush(dev_net(dev), -1); |
1da177e4 LT |
965 | } |
966 | break; | |
967 | } | |
968 | return NOTIFY_DONE; | |
969 | } | |
970 | ||
971 | static int fib_netdev_event(struct notifier_block *this, unsigned long event, void *ptr) | |
972 | { | |
973 | struct net_device *dev = ptr; | |
e5ed6399 | 974 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
1da177e4 LT |
975 | |
976 | if (event == NETDEV_UNREGISTER) { | |
e2ce1468 | 977 | fib_disable_ip(dev, 2, -1); |
1da177e4 LT |
978 | return NOTIFY_DONE; |
979 | } | |
980 | ||
981 | if (!in_dev) | |
982 | return NOTIFY_DONE; | |
983 | ||
984 | switch (event) { | |
985 | case NETDEV_UP: | |
986 | for_ifa(in_dev) { | |
987 | fib_add_ifaddr(ifa); | |
988 | } endfor_ifa(in_dev); | |
989 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
990 | fib_sync_up(dev); | |
991 | #endif | |
76e6ebfb | 992 | rt_cache_flush(dev_net(dev), -1); |
1da177e4 LT |
993 | break; |
994 | case NETDEV_DOWN: | |
e2ce1468 | 995 | fib_disable_ip(dev, 0, 0); |
1da177e4 LT |
996 | break; |
997 | case NETDEV_CHANGEMTU: | |
998 | case NETDEV_CHANGE: | |
76e6ebfb | 999 | rt_cache_flush(dev_net(dev), 0); |
1da177e4 | 1000 | break; |
a5ee1551 EB |
1001 | case NETDEV_UNREGISTER_BATCH: |
1002 | rt_cache_flush_batch(); | |
1003 | break; | |
1da177e4 LT |
1004 | } |
1005 | return NOTIFY_DONE; | |
1006 | } | |
1007 | ||
1008 | static struct notifier_block fib_inetaddr_notifier = { | |
6ed2533e | 1009 | .notifier_call = fib_inetaddr_event, |
1da177e4 LT |
1010 | }; |
1011 | ||
1012 | static struct notifier_block fib_netdev_notifier = { | |
6ed2533e | 1013 | .notifier_call = fib_netdev_event, |
1da177e4 LT |
1014 | }; |
1015 | ||
7b1a74fd | 1016 | static int __net_init ip_fib_net_init(struct net *net) |
1da177e4 | 1017 | { |
dce5cbee | 1018 | int err; |
10da66f7 ED |
1019 | size_t size = sizeof(struct hlist_head) * FIB_TABLE_HASHSZ; |
1020 | ||
1021 | /* Avoid false sharing : Use at least a full cache line */ | |
1022 | size = max_t(size_t, size, L1_CACHE_BYTES); | |
1af5a8c4 | 1023 | |
10da66f7 | 1024 | net->ipv4.fib_table_hash = kzalloc(size, GFP_KERNEL); |
e4aef8ae DL |
1025 | if (net->ipv4.fib_table_hash == NULL) |
1026 | return -ENOMEM; | |
1027 | ||
dce5cbee DL |
1028 | err = fib4_rules_init(net); |
1029 | if (err < 0) | |
1030 | goto fail; | |
1031 | return 0; | |
1032 | ||
1033 | fail: | |
1034 | kfree(net->ipv4.fib_table_hash); | |
1035 | return err; | |
7b1a74fd | 1036 | } |
1da177e4 | 1037 | |
2c8c1e72 | 1038 | static void ip_fib_net_exit(struct net *net) |
7b1a74fd DL |
1039 | { |
1040 | unsigned int i; | |
1041 | ||
1042 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
1043 | fib4_rules_exit(net); | |
1044 | #endif | |
1045 | ||
1046 | for (i = 0; i < FIB_TABLE_HASHSZ; i++) { | |
1047 | struct fib_table *tb; | |
1048 | struct hlist_head *head; | |
1049 | struct hlist_node *node, *tmp; | |
63f3444f | 1050 | |
e4aef8ae | 1051 | head = &net->ipv4.fib_table_hash[i]; |
7b1a74fd DL |
1052 | hlist_for_each_entry_safe(tb, node, tmp, head, tb_hlist) { |
1053 | hlist_del(node); | |
16c6cf8b | 1054 | fib_table_flush(tb); |
7b1a74fd DL |
1055 | kfree(tb); |
1056 | } | |
1057 | } | |
e4aef8ae | 1058 | kfree(net->ipv4.fib_table_hash); |
7b1a74fd DL |
1059 | } |
1060 | ||
1061 | static int __net_init fib_net_init(struct net *net) | |
1062 | { | |
1063 | int error; | |
1064 | ||
7b1a74fd DL |
1065 | error = ip_fib_net_init(net); |
1066 | if (error < 0) | |
1067 | goto out; | |
1068 | error = nl_fib_lookup_init(net); | |
1069 | if (error < 0) | |
1070 | goto out_nlfl; | |
1071 | error = fib_proc_init(net); | |
1072 | if (error < 0) | |
1073 | goto out_proc; | |
1074 | out: | |
1075 | return error; | |
1076 | ||
1077 | out_proc: | |
1078 | nl_fib_lookup_exit(net); | |
1079 | out_nlfl: | |
1080 | ip_fib_net_exit(net); | |
1081 | goto out; | |
1082 | } | |
1083 | ||
1084 | static void __net_exit fib_net_exit(struct net *net) | |
1085 | { | |
1086 | fib_proc_exit(net); | |
1087 | nl_fib_lookup_exit(net); | |
1088 | ip_fib_net_exit(net); | |
1089 | } | |
1090 | ||
1091 | static struct pernet_operations fib_net_ops = { | |
1092 | .init = fib_net_init, | |
1093 | .exit = fib_net_exit, | |
1094 | }; | |
1095 | ||
1096 | void __init ip_fib_init(void) | |
1097 | { | |
63f3444f TG |
1098 | rtnl_register(PF_INET, RTM_NEWROUTE, inet_rtm_newroute, NULL); |
1099 | rtnl_register(PF_INET, RTM_DELROUTE, inet_rtm_delroute, NULL); | |
1100 | rtnl_register(PF_INET, RTM_GETROUTE, NULL, inet_dump_fib); | |
7b1a74fd DL |
1101 | |
1102 | register_pernet_subsys(&fib_net_ops); | |
1103 | register_netdevice_notifier(&fib_netdev_notifier); | |
1104 | register_inetaddr_notifier(&fib_inetaddr_notifier); | |
7f9b8052 SH |
1105 | |
1106 | fib_hash_init(); | |
1da177e4 | 1107 | } |