]>
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> | |
1da177e4 | 18 | #include <linux/bitops.h> |
4fc268d2 | 19 | #include <linux/capability.h> |
1da177e4 LT |
20 | #include <linux/types.h> |
21 | #include <linux/kernel.h> | |
1da177e4 LT |
22 | #include <linux/mm.h> |
23 | #include <linux/string.h> | |
24 | #include <linux/socket.h> | |
25 | #include <linux/sockios.h> | |
26 | #include <linux/errno.h> | |
27 | #include <linux/in.h> | |
28 | #include <linux/inet.h> | |
14c85021 | 29 | #include <linux/inetdevice.h> |
1da177e4 | 30 | #include <linux/netdevice.h> |
1823730f | 31 | #include <linux/if_addr.h> |
1da177e4 LT |
32 | #include <linux/if_arp.h> |
33 | #include <linux/skbuff.h> | |
1da177e4 | 34 | #include <linux/init.h> |
1af5a8c4 | 35 | #include <linux/list.h> |
5a0e3ad6 | 36 | #include <linux/slab.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> |
990078af | 46 | #include <net/xfrm.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 | ||
5348ba85 | 54 | local_table = fib_trie_table(RT_TABLE_LOCAL); |
93456b6d | 55 | if (local_table == NULL) |
dbb50165 DL |
56 | return -ENOMEM; |
57 | ||
5348ba85 | 58 | main_table = fib_trie_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 | 84 | |
5348ba85 | 85 | tb = fib_trie_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 | ||
e4aef8ae | 117 | static void fib_flush(struct net *net) |
1da177e4 LT |
118 | { |
119 | int flushed = 0; | |
1da177e4 | 120 | struct fib_table *tb; |
1af5a8c4 | 121 | struct hlist_node *node; |
e4aef8ae | 122 | struct hlist_head *head; |
1af5a8c4 | 123 | unsigned int h; |
1da177e4 | 124 | |
1af5a8c4 | 125 | for (h = 0; h < FIB_TABLE_HASHSZ; h++) { |
e4aef8ae DL |
126 | head = &net->ipv4.fib_table_hash[h]; |
127 | hlist_for_each_entry(tb, node, head, tb_hlist) | |
16c6cf8b | 128 | flushed += fib_table_flush(tb); |
1da177e4 | 129 | } |
1da177e4 LT |
130 | |
131 | if (flushed) | |
76e6ebfb | 132 | rt_cache_flush(net, -1); |
1da177e4 LT |
133 | } |
134 | ||
05538116 LAT |
135 | /* |
136 | * Find address type as if only "dev" was present in the system. If | |
137 | * on_dev is NULL then all interfaces are taken into consideration. | |
138 | */ | |
95c96174 ED |
139 | static inline unsigned int __inet_dev_addr_type(struct net *net, |
140 | const struct net_device *dev, | |
141 | __be32 addr) | |
1da177e4 | 142 | { |
9ade2286 | 143 | struct flowi4 fl4 = { .daddr = addr }; |
1da177e4 | 144 | struct fib_result res; |
95c96174 | 145 | unsigned int ret = RTN_BROADCAST; |
03cf786c | 146 | struct fib_table *local_table; |
1da177e4 | 147 | |
1e637c74 | 148 | if (ipv4_is_zeronet(addr) || ipv4_is_lbcast(addr)) |
1da177e4 | 149 | return RTN_BROADCAST; |
f97c1e0c | 150 | if (ipv4_is_multicast(addr)) |
1da177e4 LT |
151 | return RTN_MULTICAST; |
152 | ||
153 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
154 | res.r = NULL; | |
155 | #endif | |
e905a9ed | 156 | |
6b175b26 | 157 | local_table = fib_get_table(net, RT_TABLE_LOCAL); |
03cf786c | 158 | if (local_table) { |
1da177e4 | 159 | ret = RTN_UNICAST; |
ebc0ffae | 160 | rcu_read_lock(); |
9ade2286 | 161 | if (!fib_table_lookup(local_table, &fl4, &res, FIB_LOOKUP_NOREF)) { |
05538116 LAT |
162 | if (!dev || dev == res.fi->fib_dev) |
163 | ret = res.type; | |
1da177e4 | 164 | } |
ebc0ffae | 165 | rcu_read_unlock(); |
1da177e4 LT |
166 | } |
167 | return ret; | |
168 | } | |
169 | ||
6b175b26 | 170 | unsigned int inet_addr_type(struct net *net, __be32 addr) |
05538116 | 171 | { |
6b175b26 | 172 | return __inet_dev_addr_type(net, NULL, addr); |
05538116 | 173 | } |
4bc2f18b | 174 | EXPORT_SYMBOL(inet_addr_type); |
05538116 | 175 | |
6b175b26 EB |
176 | unsigned int inet_dev_addr_type(struct net *net, const struct net_device *dev, |
177 | __be32 addr) | |
05538116 | 178 | { |
6a31d2a9 | 179 | return __inet_dev_addr_type(net, dev, addr); |
05538116 | 180 | } |
4bc2f18b | 181 | EXPORT_SYMBOL(inet_dev_addr_type); |
05538116 | 182 | |
35ebf65e DM |
183 | __be32 fib_compute_spec_dst(struct sk_buff *skb) |
184 | { | |
185 | struct net_device *dev = skb->dev; | |
186 | struct in_device *in_dev; | |
187 | struct fib_result res; | |
188 | struct flowi4 fl4; | |
189 | struct net *net; | |
190 | ||
191 | if (skb->pkt_type != PACKET_BROADCAST && | |
192 | skb->pkt_type != PACKET_MULTICAST) | |
193 | return ip_hdr(skb)->daddr; | |
194 | ||
195 | in_dev = __in_dev_get_rcu(dev); | |
196 | BUG_ON(!in_dev); | |
197 | fl4.flowi4_oif = 0; | |
198 | fl4.flowi4_iif = 0; | |
199 | fl4.daddr = ip_hdr(skb)->saddr; | |
200 | fl4.saddr = ip_hdr(skb)->daddr; | |
201 | fl4.flowi4_tos = RT_TOS(ip_hdr(skb)->tos); | |
202 | fl4.flowi4_scope = RT_SCOPE_UNIVERSE; | |
203 | fl4.flowi4_mark = IN_DEV_SRC_VMARK(in_dev) ? skb->mark : 0; | |
204 | ||
205 | net = dev_net(dev); | |
206 | if (!fib_lookup(net, &fl4, &res)) | |
207 | return FIB_RES_PREFSRC(net, res); | |
208 | else | |
209 | return inet_select_addr(dev, 0, RT_SCOPE_UNIVERSE); | |
210 | } | |
211 | ||
1da177e4 | 212 | /* Given (packet source, input interface) and optional (dst, oif, tos): |
6a31d2a9 ED |
213 | * - (main) check, that source is valid i.e. not broadcast or our local |
214 | * address. | |
215 | * - figure out what "logical" interface this packet arrived | |
216 | * and calculate "specific destination" address. | |
217 | * - check, that packet arrived from expected physical interface. | |
ebc0ffae | 218 | * called with rcu_read_lock() |
1da177e4 | 219 | */ |
5c04c819 MS |
220 | int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst, u8 tos, |
221 | int oif, struct net_device *dev, __be32 *spec_dst, | |
222 | u32 *itag) | |
1da177e4 LT |
223 | { |
224 | struct in_device *in_dev; | |
9ade2286 | 225 | struct flowi4 fl4; |
1da177e4 | 226 | struct fib_result res; |
8153a10c | 227 | int no_addr, rpf, accept_local; |
6f86b325 | 228 | bool dev_match; |
1da177e4 | 229 | int ret; |
5b707aaa | 230 | struct net *net; |
1da177e4 | 231 | |
9ade2286 DM |
232 | fl4.flowi4_oif = 0; |
233 | fl4.flowi4_iif = oif; | |
9ade2286 DM |
234 | fl4.daddr = src; |
235 | fl4.saddr = dst; | |
236 | fl4.flowi4_tos = tos; | |
237 | fl4.flowi4_scope = RT_SCOPE_UNIVERSE; | |
cc7e17ea | 238 | |
8153a10c | 239 | no_addr = rpf = accept_local = 0; |
e5ed6399 | 240 | in_dev = __in_dev_get_rcu(dev); |
1da177e4 LT |
241 | if (in_dev) { |
242 | no_addr = in_dev->ifa_list == NULL; | |
990078af MS |
243 | |
244 | /* Ignore rp_filter for packets protected by IPsec. */ | |
245 | rpf = secpath_exists(skb) ? 0 : IN_DEV_RPFILTER(in_dev); | |
246 | ||
8153a10c | 247 | accept_local = IN_DEV_ACCEPT_LOCAL(in_dev); |
5c04c819 | 248 | fl4.flowi4_mark = IN_DEV_SRC_VMARK(in_dev) ? skb->mark : 0; |
1da177e4 | 249 | } |
1da177e4 LT |
250 | |
251 | if (in_dev == NULL) | |
252 | goto e_inval; | |
253 | ||
c346dca1 | 254 | net = dev_net(dev); |
9ade2286 | 255 | if (fib_lookup(net, &fl4, &res)) |
1da177e4 | 256 | goto last_resort; |
8153a10c PM |
257 | if (res.type != RTN_UNICAST) { |
258 | if (res.type != RTN_LOCAL || !accept_local) | |
ebc0ffae | 259 | goto e_inval; |
8153a10c | 260 | } |
436c3b66 | 261 | *spec_dst = FIB_RES_PREFSRC(net, res); |
1da177e4 | 262 | fib_combine_itag(itag, &res); |
6f86b325 DM |
263 | dev_match = false; |
264 | ||
1da177e4 | 265 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
6f86b325 DM |
266 | for (ret = 0; ret < res.fi->fib_nhs; ret++) { |
267 | struct fib_nh *nh = &res.fi->fib_nh[ret]; | |
268 | ||
269 | if (nh->nh_dev == dev) { | |
270 | dev_match = true; | |
271 | break; | |
272 | } | |
273 | } | |
1da177e4 LT |
274 | #else |
275 | if (FIB_RES_DEV(res) == dev) | |
6f86b325 | 276 | dev_match = true; |
1da177e4 | 277 | #endif |
6f86b325 | 278 | if (dev_match) { |
1da177e4 | 279 | ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST; |
1da177e4 LT |
280 | return ret; |
281 | } | |
1da177e4 LT |
282 | if (no_addr) |
283 | goto last_resort; | |
c1cf8422 | 284 | if (rpf == 1) |
b5f7e755 | 285 | goto e_rpf; |
9ade2286 | 286 | fl4.flowi4_oif = dev->ifindex; |
1da177e4 LT |
287 | |
288 | ret = 0; | |
9ade2286 | 289 | if (fib_lookup(net, &fl4, &res) == 0) { |
1da177e4 | 290 | if (res.type == RTN_UNICAST) { |
436c3b66 | 291 | *spec_dst = FIB_RES_PREFSRC(net, res); |
1da177e4 LT |
292 | ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST; |
293 | } | |
1da177e4 LT |
294 | } |
295 | return ret; | |
296 | ||
297 | last_resort: | |
298 | if (rpf) | |
b5f7e755 | 299 | goto e_rpf; |
1da177e4 LT |
300 | *spec_dst = inet_select_addr(dev, 0, RT_SCOPE_UNIVERSE); |
301 | *itag = 0; | |
302 | return 0; | |
303 | ||
1da177e4 LT |
304 | e_inval: |
305 | return -EINVAL; | |
b5f7e755 ED |
306 | e_rpf: |
307 | return -EXDEV; | |
1da177e4 LT |
308 | } |
309 | ||
81f7bf6c | 310 | static inline __be32 sk_extract_addr(struct sockaddr *addr) |
4e902c57 TG |
311 | { |
312 | return ((struct sockaddr_in *) addr)->sin_addr.s_addr; | |
313 | } | |
314 | ||
315 | static int put_rtax(struct nlattr *mx, int len, int type, u32 value) | |
316 | { | |
317 | struct nlattr *nla; | |
318 | ||
319 | nla = (struct nlattr *) ((char *) mx + len); | |
320 | nla->nla_type = type; | |
321 | nla->nla_len = nla_attr_size(4); | |
322 | *(u32 *) nla_data(nla) = value; | |
323 | ||
324 | return len + nla_total_size(4); | |
325 | } | |
326 | ||
4b5d47d4 | 327 | static int rtentry_to_fib_config(struct net *net, int cmd, struct rtentry *rt, |
4e902c57 TG |
328 | struct fib_config *cfg) |
329 | { | |
6d85c10a | 330 | __be32 addr; |
4e902c57 TG |
331 | int plen; |
332 | ||
333 | memset(cfg, 0, sizeof(*cfg)); | |
4b5d47d4 | 334 | cfg->fc_nlinfo.nl_net = net; |
4e902c57 TG |
335 | |
336 | if (rt->rt_dst.sa_family != AF_INET) | |
337 | return -EAFNOSUPPORT; | |
338 | ||
339 | /* | |
340 | * Check mask for validity: | |
341 | * a) it must be contiguous. | |
342 | * b) destination must have all host bits clear. | |
343 | * c) if application forgot to set correct family (AF_INET), | |
344 | * reject request unless it is absolutely clear i.e. | |
345 | * both family and mask are zero. | |
346 | */ | |
347 | plen = 32; | |
348 | addr = sk_extract_addr(&rt->rt_dst); | |
349 | if (!(rt->rt_flags & RTF_HOST)) { | |
81f7bf6c | 350 | __be32 mask = sk_extract_addr(&rt->rt_genmask); |
4e902c57 TG |
351 | |
352 | if (rt->rt_genmask.sa_family != AF_INET) { | |
353 | if (mask || rt->rt_genmask.sa_family) | |
354 | return -EAFNOSUPPORT; | |
355 | } | |
356 | ||
357 | if (bad_mask(mask, addr)) | |
358 | return -EINVAL; | |
359 | ||
360 | plen = inet_mask_len(mask); | |
361 | } | |
362 | ||
363 | cfg->fc_dst_len = plen; | |
364 | cfg->fc_dst = addr; | |
365 | ||
366 | if (cmd != SIOCDELRT) { | |
367 | cfg->fc_nlflags = NLM_F_CREATE; | |
368 | cfg->fc_protocol = RTPROT_BOOT; | |
369 | } | |
370 | ||
371 | if (rt->rt_metric) | |
372 | cfg->fc_priority = rt->rt_metric - 1; | |
373 | ||
374 | if (rt->rt_flags & RTF_REJECT) { | |
375 | cfg->fc_scope = RT_SCOPE_HOST; | |
376 | cfg->fc_type = RTN_UNREACHABLE; | |
377 | return 0; | |
378 | } | |
379 | ||
380 | cfg->fc_scope = RT_SCOPE_NOWHERE; | |
381 | cfg->fc_type = RTN_UNICAST; | |
382 | ||
383 | if (rt->rt_dev) { | |
384 | char *colon; | |
385 | struct net_device *dev; | |
386 | char devname[IFNAMSIZ]; | |
387 | ||
388 | if (copy_from_user(devname, rt->rt_dev, IFNAMSIZ-1)) | |
389 | return -EFAULT; | |
390 | ||
391 | devname[IFNAMSIZ-1] = 0; | |
392 | colon = strchr(devname, ':'); | |
393 | if (colon) | |
394 | *colon = 0; | |
4b5d47d4 | 395 | dev = __dev_get_by_name(net, devname); |
4e902c57 TG |
396 | if (!dev) |
397 | return -ENODEV; | |
398 | cfg->fc_oif = dev->ifindex; | |
399 | if (colon) { | |
400 | struct in_ifaddr *ifa; | |
401 | struct in_device *in_dev = __in_dev_get_rtnl(dev); | |
402 | if (!in_dev) | |
403 | return -ENODEV; | |
404 | *colon = ':'; | |
405 | for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) | |
406 | if (strcmp(ifa->ifa_label, devname) == 0) | |
407 | break; | |
408 | if (ifa == NULL) | |
409 | return -ENODEV; | |
410 | cfg->fc_prefsrc = ifa->ifa_local; | |
411 | } | |
412 | } | |
413 | ||
414 | addr = sk_extract_addr(&rt->rt_gateway); | |
415 | if (rt->rt_gateway.sa_family == AF_INET && addr) { | |
416 | cfg->fc_gw = addr; | |
417 | if (rt->rt_flags & RTF_GATEWAY && | |
4b5d47d4 | 418 | inet_addr_type(net, addr) == RTN_UNICAST) |
4e902c57 TG |
419 | cfg->fc_scope = RT_SCOPE_UNIVERSE; |
420 | } | |
421 | ||
422 | if (cmd == SIOCDELRT) | |
423 | return 0; | |
424 | ||
425 | if (rt->rt_flags & RTF_GATEWAY && !cfg->fc_gw) | |
426 | return -EINVAL; | |
427 | ||
428 | if (cfg->fc_scope == RT_SCOPE_NOWHERE) | |
429 | cfg->fc_scope = RT_SCOPE_LINK; | |
430 | ||
431 | if (rt->rt_flags & (RTF_MTU | RTF_WINDOW | RTF_IRTT)) { | |
432 | struct nlattr *mx; | |
433 | int len = 0; | |
434 | ||
435 | mx = kzalloc(3 * nla_total_size(4), GFP_KERNEL); | |
e905a9ed | 436 | if (mx == NULL) |
4e902c57 TG |
437 | return -ENOMEM; |
438 | ||
439 | if (rt->rt_flags & RTF_MTU) | |
440 | len = put_rtax(mx, len, RTAX_ADVMSS, rt->rt_mtu - 40); | |
441 | ||
442 | if (rt->rt_flags & RTF_WINDOW) | |
443 | len = put_rtax(mx, len, RTAX_WINDOW, rt->rt_window); | |
444 | ||
445 | if (rt->rt_flags & RTF_IRTT) | |
446 | len = put_rtax(mx, len, RTAX_RTT, rt->rt_irtt << 3); | |
447 | ||
448 | cfg->fc_mx = mx; | |
449 | cfg->fc_mx_len = len; | |
450 | } | |
451 | ||
452 | return 0; | |
453 | } | |
454 | ||
1da177e4 | 455 | /* |
6a31d2a9 ED |
456 | * Handle IP routing ioctl calls. |
457 | * These are used to manipulate the routing tables | |
1da177e4 | 458 | */ |
1bad118a | 459 | int ip_rt_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
1da177e4 | 460 | { |
4e902c57 TG |
461 | struct fib_config cfg; |
462 | struct rtentry rt; | |
1da177e4 | 463 | int err; |
1da177e4 LT |
464 | |
465 | switch (cmd) { | |
466 | case SIOCADDRT: /* Add a route */ | |
467 | case SIOCDELRT: /* Delete a route */ | |
468 | if (!capable(CAP_NET_ADMIN)) | |
469 | return -EPERM; | |
4e902c57 TG |
470 | |
471 | if (copy_from_user(&rt, arg, sizeof(rt))) | |
1da177e4 | 472 | return -EFAULT; |
4e902c57 | 473 | |
1da177e4 | 474 | rtnl_lock(); |
1bad118a | 475 | err = rtentry_to_fib_config(net, cmd, &rt, &cfg); |
1da177e4 | 476 | if (err == 0) { |
4e902c57 TG |
477 | struct fib_table *tb; |
478 | ||
1da177e4 | 479 | if (cmd == SIOCDELRT) { |
1bad118a | 480 | tb = fib_get_table(net, cfg.fc_table); |
1da177e4 | 481 | if (tb) |
16c6cf8b | 482 | err = fib_table_delete(tb, &cfg); |
4e902c57 TG |
483 | else |
484 | err = -ESRCH; | |
1da177e4 | 485 | } else { |
1bad118a | 486 | tb = fib_new_table(net, cfg.fc_table); |
1da177e4 | 487 | if (tb) |
16c6cf8b | 488 | err = fib_table_insert(tb, &cfg); |
4e902c57 TG |
489 | else |
490 | err = -ENOBUFS; | |
1da177e4 | 491 | } |
4e902c57 TG |
492 | |
493 | /* allocated by rtentry_to_fib_config() */ | |
494 | kfree(cfg.fc_mx); | |
1da177e4 LT |
495 | } |
496 | rtnl_unlock(); | |
497 | return err; | |
498 | } | |
499 | return -EINVAL; | |
500 | } | |
501 | ||
6a31d2a9 | 502 | const struct nla_policy rtm_ipv4_policy[RTA_MAX + 1] = { |
4e902c57 TG |
503 | [RTA_DST] = { .type = NLA_U32 }, |
504 | [RTA_SRC] = { .type = NLA_U32 }, | |
505 | [RTA_IIF] = { .type = NLA_U32 }, | |
506 | [RTA_OIF] = { .type = NLA_U32 }, | |
507 | [RTA_GATEWAY] = { .type = NLA_U32 }, | |
508 | [RTA_PRIORITY] = { .type = NLA_U32 }, | |
509 | [RTA_PREFSRC] = { .type = NLA_U32 }, | |
510 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
5176f91e | 511 | [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) }, |
4e902c57 | 512 | [RTA_FLOW] = { .type = NLA_U32 }, |
4e902c57 TG |
513 | }; |
514 | ||
4b5d47d4 | 515 | static int rtm_to_fib_config(struct net *net, struct sk_buff *skb, |
6a31d2a9 | 516 | struct nlmsghdr *nlh, struct fib_config *cfg) |
1da177e4 | 517 | { |
4e902c57 TG |
518 | struct nlattr *attr; |
519 | int err, remaining; | |
520 | struct rtmsg *rtm; | |
521 | ||
522 | err = nlmsg_validate(nlh, sizeof(*rtm), RTA_MAX, rtm_ipv4_policy); | |
523 | if (err < 0) | |
524 | goto errout; | |
525 | ||
526 | memset(cfg, 0, sizeof(*cfg)); | |
527 | ||
528 | rtm = nlmsg_data(nlh); | |
4e902c57 | 529 | cfg->fc_dst_len = rtm->rtm_dst_len; |
4e902c57 TG |
530 | cfg->fc_tos = rtm->rtm_tos; |
531 | cfg->fc_table = rtm->rtm_table; | |
532 | cfg->fc_protocol = rtm->rtm_protocol; | |
533 | cfg->fc_scope = rtm->rtm_scope; | |
534 | cfg->fc_type = rtm->rtm_type; | |
535 | cfg->fc_flags = rtm->rtm_flags; | |
536 | cfg->fc_nlflags = nlh->nlmsg_flags; | |
537 | ||
538 | cfg->fc_nlinfo.pid = NETLINK_CB(skb).pid; | |
539 | cfg->fc_nlinfo.nlh = nlh; | |
4b5d47d4 | 540 | cfg->fc_nlinfo.nl_net = net; |
4e902c57 | 541 | |
a0ee18b9 TG |
542 | if (cfg->fc_type > RTN_MAX) { |
543 | err = -EINVAL; | |
544 | goto errout; | |
545 | } | |
546 | ||
4e902c57 | 547 | nlmsg_for_each_attr(attr, nlh, sizeof(struct rtmsg), remaining) { |
8f4c1f9b | 548 | switch (nla_type(attr)) { |
4e902c57 | 549 | case RTA_DST: |
17fb2c64 | 550 | cfg->fc_dst = nla_get_be32(attr); |
4e902c57 | 551 | break; |
4e902c57 TG |
552 | case RTA_OIF: |
553 | cfg->fc_oif = nla_get_u32(attr); | |
554 | break; | |
555 | case RTA_GATEWAY: | |
17fb2c64 | 556 | cfg->fc_gw = nla_get_be32(attr); |
4e902c57 TG |
557 | break; |
558 | case RTA_PRIORITY: | |
559 | cfg->fc_priority = nla_get_u32(attr); | |
560 | break; | |
561 | case RTA_PREFSRC: | |
17fb2c64 | 562 | cfg->fc_prefsrc = nla_get_be32(attr); |
4e902c57 TG |
563 | break; |
564 | case RTA_METRICS: | |
565 | cfg->fc_mx = nla_data(attr); | |
566 | cfg->fc_mx_len = nla_len(attr); | |
567 | break; | |
568 | case RTA_MULTIPATH: | |
569 | cfg->fc_mp = nla_data(attr); | |
570 | cfg->fc_mp_len = nla_len(attr); | |
571 | break; | |
572 | case RTA_FLOW: | |
573 | cfg->fc_flow = nla_get_u32(attr); | |
574 | break; | |
4e902c57 TG |
575 | case RTA_TABLE: |
576 | cfg->fc_table = nla_get_u32(attr); | |
577 | break; | |
1da177e4 LT |
578 | } |
579 | } | |
4e902c57 | 580 | |
1da177e4 | 581 | return 0; |
4e902c57 TG |
582 | errout: |
583 | return err; | |
1da177e4 LT |
584 | } |
585 | ||
6ed2533e | 586 | static int inet_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) |
1da177e4 | 587 | { |
3b1e0a65 | 588 | struct net *net = sock_net(skb->sk); |
4e902c57 TG |
589 | struct fib_config cfg; |
590 | struct fib_table *tb; | |
591 | int err; | |
1da177e4 | 592 | |
4b5d47d4 | 593 | err = rtm_to_fib_config(net, skb, nlh, &cfg); |
4e902c57 TG |
594 | if (err < 0) |
595 | goto errout; | |
1da177e4 | 596 | |
8ad4942c | 597 | tb = fib_get_table(net, cfg.fc_table); |
4e902c57 TG |
598 | if (tb == NULL) { |
599 | err = -ESRCH; | |
600 | goto errout; | |
601 | } | |
602 | ||
16c6cf8b | 603 | err = fib_table_delete(tb, &cfg); |
4e902c57 TG |
604 | errout: |
605 | return err; | |
1da177e4 LT |
606 | } |
607 | ||
6ed2533e | 608 | static int inet_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) |
1da177e4 | 609 | { |
3b1e0a65 | 610 | struct net *net = sock_net(skb->sk); |
4e902c57 TG |
611 | struct fib_config cfg; |
612 | struct fib_table *tb; | |
613 | int err; | |
1da177e4 | 614 | |
4b5d47d4 | 615 | err = rtm_to_fib_config(net, skb, nlh, &cfg); |
4e902c57 TG |
616 | if (err < 0) |
617 | goto errout; | |
1da177e4 | 618 | |
226b0b4a | 619 | tb = fib_new_table(net, cfg.fc_table); |
4e902c57 TG |
620 | if (tb == NULL) { |
621 | err = -ENOBUFS; | |
622 | goto errout; | |
623 | } | |
624 | ||
16c6cf8b | 625 | err = fib_table_insert(tb, &cfg); |
4e902c57 TG |
626 | errout: |
627 | return err; | |
1da177e4 LT |
628 | } |
629 | ||
63f3444f | 630 | static int inet_dump_fib(struct sk_buff *skb, struct netlink_callback *cb) |
1da177e4 | 631 | { |
3b1e0a65 | 632 | struct net *net = sock_net(skb->sk); |
1af5a8c4 PM |
633 | unsigned int h, s_h; |
634 | unsigned int e = 0, s_e; | |
1da177e4 | 635 | struct fib_table *tb; |
1af5a8c4 | 636 | struct hlist_node *node; |
e4aef8ae | 637 | struct hlist_head *head; |
1af5a8c4 | 638 | int dumped = 0; |
1da177e4 | 639 | |
be403ea1 TG |
640 | if (nlmsg_len(cb->nlh) >= sizeof(struct rtmsg) && |
641 | ((struct rtmsg *) nlmsg_data(cb->nlh))->rtm_flags & RTM_F_CLONED) | |
1da177e4 LT |
642 | return ip_rt_dump(skb, cb); |
643 | ||
1af5a8c4 PM |
644 | s_h = cb->args[0]; |
645 | s_e = cb->args[1]; | |
646 | ||
647 | for (h = s_h; h < FIB_TABLE_HASHSZ; h++, s_e = 0) { | |
648 | e = 0; | |
e4aef8ae DL |
649 | head = &net->ipv4.fib_table_hash[h]; |
650 | hlist_for_each_entry(tb, node, head, tb_hlist) { | |
1af5a8c4 PM |
651 | if (e < s_e) |
652 | goto next; | |
653 | if (dumped) | |
654 | memset(&cb->args[2], 0, sizeof(cb->args) - | |
e905a9ed | 655 | 2 * sizeof(cb->args[0])); |
16c6cf8b | 656 | if (fib_table_dump(tb, skb, cb) < 0) |
1af5a8c4 PM |
657 | goto out; |
658 | dumped = 1; | |
659 | next: | |
660 | e++; | |
661 | } | |
1da177e4 | 662 | } |
1af5a8c4 PM |
663 | out: |
664 | cb->args[1] = e; | |
665 | cb->args[0] = h; | |
1da177e4 LT |
666 | |
667 | return skb->len; | |
668 | } | |
669 | ||
670 | /* Prepare and feed intra-kernel routing request. | |
6a31d2a9 ED |
671 | * Really, it should be netlink message, but :-( netlink |
672 | * can be not configured, so that we feed it directly | |
673 | * to fib engine. It is legal, because all events occur | |
674 | * only when netlink is already locked. | |
1da177e4 | 675 | */ |
81f7bf6c | 676 | static void fib_magic(int cmd, int type, __be32 dst, int dst_len, struct in_ifaddr *ifa) |
1da177e4 | 677 | { |
c346dca1 | 678 | struct net *net = dev_net(ifa->ifa_dev->dev); |
4e902c57 TG |
679 | struct fib_table *tb; |
680 | struct fib_config cfg = { | |
681 | .fc_protocol = RTPROT_KERNEL, | |
682 | .fc_type = type, | |
683 | .fc_dst = dst, | |
684 | .fc_dst_len = dst_len, | |
685 | .fc_prefsrc = ifa->ifa_local, | |
686 | .fc_oif = ifa->ifa_dev->dev->ifindex, | |
687 | .fc_nlflags = NLM_F_CREATE | NLM_F_APPEND, | |
4d1169c1 | 688 | .fc_nlinfo = { |
4b5d47d4 | 689 | .nl_net = net, |
4d1169c1 | 690 | }, |
4e902c57 | 691 | }; |
1da177e4 LT |
692 | |
693 | if (type == RTN_UNICAST) | |
4b5d47d4 | 694 | tb = fib_new_table(net, RT_TABLE_MAIN); |
1da177e4 | 695 | else |
4b5d47d4 | 696 | tb = fib_new_table(net, RT_TABLE_LOCAL); |
1da177e4 LT |
697 | |
698 | if (tb == NULL) | |
699 | return; | |
700 | ||
4e902c57 | 701 | cfg.fc_table = tb->tb_id; |
1da177e4 | 702 | |
4e902c57 TG |
703 | if (type != RTN_LOCAL) |
704 | cfg.fc_scope = RT_SCOPE_LINK; | |
705 | else | |
706 | cfg.fc_scope = RT_SCOPE_HOST; | |
1da177e4 LT |
707 | |
708 | if (cmd == RTM_NEWROUTE) | |
16c6cf8b | 709 | fib_table_insert(tb, &cfg); |
1da177e4 | 710 | else |
16c6cf8b | 711 | fib_table_delete(tb, &cfg); |
1da177e4 LT |
712 | } |
713 | ||
0ff60a45 | 714 | void fib_add_ifaddr(struct in_ifaddr *ifa) |
1da177e4 LT |
715 | { |
716 | struct in_device *in_dev = ifa->ifa_dev; | |
717 | struct net_device *dev = in_dev->dev; | |
718 | struct in_ifaddr *prim = ifa; | |
a144ea4b AV |
719 | __be32 mask = ifa->ifa_mask; |
720 | __be32 addr = ifa->ifa_local; | |
6a31d2a9 | 721 | __be32 prefix = ifa->ifa_address & mask; |
1da177e4 | 722 | |
6a31d2a9 | 723 | if (ifa->ifa_flags & IFA_F_SECONDARY) { |
1da177e4 LT |
724 | prim = inet_ifa_byprefix(in_dev, prefix, mask); |
725 | if (prim == NULL) { | |
058bd4d2 | 726 | pr_warn("%s: bug: prim == NULL\n", __func__); |
1da177e4 LT |
727 | return; |
728 | } | |
729 | } | |
730 | ||
731 | fib_magic(RTM_NEWROUTE, RTN_LOCAL, addr, 32, prim); | |
732 | ||
6a31d2a9 | 733 | if (!(dev->flags & IFF_UP)) |
1da177e4 LT |
734 | return; |
735 | ||
736 | /* Add broadcast address, if it is explicitly assigned. */ | |
a144ea4b | 737 | if (ifa->ifa_broadcast && ifa->ifa_broadcast != htonl(0xFFFFFFFF)) |
1da177e4 LT |
738 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim); |
739 | ||
6a31d2a9 | 740 | if (!ipv4_is_zeronet(prefix) && !(ifa->ifa_flags & IFA_F_SECONDARY) && |
1da177e4 | 741 | (prefix != addr || ifa->ifa_prefixlen < 32)) { |
6a31d2a9 ED |
742 | fib_magic(RTM_NEWROUTE, |
743 | dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST, | |
744 | prefix, ifa->ifa_prefixlen, prim); | |
1da177e4 LT |
745 | |
746 | /* Add network specific broadcasts, when it takes a sense */ | |
747 | if (ifa->ifa_prefixlen < 31) { | |
748 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix, 32, prim); | |
6a31d2a9 ED |
749 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix | ~mask, |
750 | 32, prim); | |
1da177e4 LT |
751 | } |
752 | } | |
753 | } | |
754 | ||
e6abbaa2 JA |
755 | /* Delete primary or secondary address. |
756 | * Optionally, on secondary address promotion consider the addresses | |
757 | * from subnet iprim as deleted, even if they are in device list. | |
758 | * In this case the secondary ifa can be in device list. | |
759 | */ | |
760 | void fib_del_ifaddr(struct in_ifaddr *ifa, struct in_ifaddr *iprim) | |
1da177e4 LT |
761 | { |
762 | struct in_device *in_dev = ifa->ifa_dev; | |
763 | struct net_device *dev = in_dev->dev; | |
764 | struct in_ifaddr *ifa1; | |
e6abbaa2 | 765 | struct in_ifaddr *prim = ifa, *prim1 = NULL; |
6a31d2a9 ED |
766 | __be32 brd = ifa->ifa_address | ~ifa->ifa_mask; |
767 | __be32 any = ifa->ifa_address & ifa->ifa_mask; | |
1da177e4 LT |
768 | #define LOCAL_OK 1 |
769 | #define BRD_OK 2 | |
770 | #define BRD0_OK 4 | |
771 | #define BRD1_OK 8 | |
95c96174 | 772 | unsigned int ok = 0; |
e6abbaa2 JA |
773 | int subnet = 0; /* Primary network */ |
774 | int gone = 1; /* Address is missing */ | |
775 | int same_prefsrc = 0; /* Another primary with same IP */ | |
1da177e4 | 776 | |
e6abbaa2 | 777 | if (ifa->ifa_flags & IFA_F_SECONDARY) { |
1da177e4 LT |
778 | prim = inet_ifa_byprefix(in_dev, any, ifa->ifa_mask); |
779 | if (prim == NULL) { | |
058bd4d2 | 780 | pr_warn("%s: bug: prim == NULL\n", __func__); |
1da177e4 LT |
781 | return; |
782 | } | |
e6abbaa2 | 783 | if (iprim && iprim != prim) { |
058bd4d2 | 784 | pr_warn("%s: bug: iprim != prim\n", __func__); |
e6abbaa2 JA |
785 | return; |
786 | } | |
787 | } else if (!ipv4_is_zeronet(any) && | |
788 | (any != ifa->ifa_local || ifa->ifa_prefixlen < 32)) { | |
789 | fib_magic(RTM_DELROUTE, | |
790 | dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST, | |
791 | any, ifa->ifa_prefixlen, prim); | |
792 | subnet = 1; | |
1da177e4 LT |
793 | } |
794 | ||
795 | /* Deletion is more complicated than add. | |
6a31d2a9 ED |
796 | * We should take care of not to delete too much :-) |
797 | * | |
798 | * Scan address list to be sure that addresses are really gone. | |
1da177e4 LT |
799 | */ |
800 | ||
801 | for (ifa1 = in_dev->ifa_list; ifa1; ifa1 = ifa1->ifa_next) { | |
e6abbaa2 JA |
802 | if (ifa1 == ifa) { |
803 | /* promotion, keep the IP */ | |
804 | gone = 0; | |
805 | continue; | |
806 | } | |
807 | /* Ignore IFAs from our subnet */ | |
808 | if (iprim && ifa1->ifa_mask == iprim->ifa_mask && | |
809 | inet_ifa_match(ifa1->ifa_address, iprim)) | |
810 | continue; | |
811 | ||
812 | /* Ignore ifa1 if it uses different primary IP (prefsrc) */ | |
813 | if (ifa1->ifa_flags & IFA_F_SECONDARY) { | |
814 | /* Another address from our subnet? */ | |
815 | if (ifa1->ifa_mask == prim->ifa_mask && | |
816 | inet_ifa_match(ifa1->ifa_address, prim)) | |
817 | prim1 = prim; | |
818 | else { | |
819 | /* We reached the secondaries, so | |
820 | * same_prefsrc should be determined. | |
821 | */ | |
822 | if (!same_prefsrc) | |
823 | continue; | |
824 | /* Search new prim1 if ifa1 is not | |
825 | * using the current prim1 | |
826 | */ | |
827 | if (!prim1 || | |
828 | ifa1->ifa_mask != prim1->ifa_mask || | |
829 | !inet_ifa_match(ifa1->ifa_address, prim1)) | |
830 | prim1 = inet_ifa_byprefix(in_dev, | |
831 | ifa1->ifa_address, | |
832 | ifa1->ifa_mask); | |
833 | if (!prim1) | |
834 | continue; | |
835 | if (prim1->ifa_local != prim->ifa_local) | |
836 | continue; | |
837 | } | |
838 | } else { | |
839 | if (prim->ifa_local != ifa1->ifa_local) | |
840 | continue; | |
841 | prim1 = ifa1; | |
842 | if (prim != prim1) | |
843 | same_prefsrc = 1; | |
844 | } | |
1da177e4 LT |
845 | if (ifa->ifa_local == ifa1->ifa_local) |
846 | ok |= LOCAL_OK; | |
847 | if (ifa->ifa_broadcast == ifa1->ifa_broadcast) | |
848 | ok |= BRD_OK; | |
849 | if (brd == ifa1->ifa_broadcast) | |
850 | ok |= BRD1_OK; | |
851 | if (any == ifa1->ifa_broadcast) | |
852 | ok |= BRD0_OK; | |
e6abbaa2 JA |
853 | /* primary has network specific broadcasts */ |
854 | if (prim1 == ifa1 && ifa1->ifa_prefixlen < 31) { | |
855 | __be32 brd1 = ifa1->ifa_address | ~ifa1->ifa_mask; | |
856 | __be32 any1 = ifa1->ifa_address & ifa1->ifa_mask; | |
857 | ||
858 | if (!ipv4_is_zeronet(any1)) { | |
859 | if (ifa->ifa_broadcast == brd1 || | |
860 | ifa->ifa_broadcast == any1) | |
861 | ok |= BRD_OK; | |
862 | if (brd == brd1 || brd == any1) | |
863 | ok |= BRD1_OK; | |
864 | if (any == brd1 || any == any1) | |
865 | ok |= BRD0_OK; | |
866 | } | |
867 | } | |
1da177e4 LT |
868 | } |
869 | ||
6a31d2a9 | 870 | if (!(ok & BRD_OK)) |
1da177e4 | 871 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim); |
e6abbaa2 JA |
872 | if (subnet && ifa->ifa_prefixlen < 31) { |
873 | if (!(ok & BRD1_OK)) | |
874 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, brd, 32, prim); | |
875 | if (!(ok & BRD0_OK)) | |
876 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, any, 32, prim); | |
877 | } | |
6a31d2a9 | 878 | if (!(ok & LOCAL_OK)) { |
1da177e4 LT |
879 | fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 32, prim); |
880 | ||
881 | /* Check, that this local address finally disappeared. */ | |
e6abbaa2 JA |
882 | if (gone && |
883 | inet_addr_type(dev_net(dev), ifa->ifa_local) != RTN_LOCAL) { | |
1da177e4 | 884 | /* And the last, but not the least thing. |
6a31d2a9 ED |
885 | * We must flush stray FIB entries. |
886 | * | |
887 | * First of all, we scan fib_info list searching | |
888 | * for stray nexthop entries, then ignite fib_flush. | |
889 | */ | |
c346dca1 YH |
890 | if (fib_sync_down_addr(dev_net(dev), ifa->ifa_local)) |
891 | fib_flush(dev_net(dev)); | |
1da177e4 LT |
892 | } |
893 | } | |
894 | #undef LOCAL_OK | |
895 | #undef BRD_OK | |
896 | #undef BRD0_OK | |
897 | #undef BRD1_OK | |
898 | } | |
899 | ||
6a31d2a9 | 900 | static void nl_fib_lookup(struct fib_result_nl *frn, struct fib_table *tb) |
246955fe | 901 | { |
e905a9ed | 902 | |
246955fe | 903 | struct fib_result res; |
9ade2286 DM |
904 | struct flowi4 fl4 = { |
905 | .flowi4_mark = frn->fl_mark, | |
906 | .daddr = frn->fl_addr, | |
907 | .flowi4_tos = frn->fl_tos, | |
908 | .flowi4_scope = frn->fl_scope, | |
6a31d2a9 | 909 | }; |
1194ed0a | 910 | |
912a41a4 SV |
911 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
912 | res.r = NULL; | |
913 | #endif | |
914 | ||
1194ed0a | 915 | frn->err = -ENOENT; |
246955fe RO |
916 | if (tb) { |
917 | local_bh_disable(); | |
918 | ||
919 | frn->tb_id = tb->tb_id; | |
ebc0ffae | 920 | rcu_read_lock(); |
9ade2286 | 921 | frn->err = fib_table_lookup(tb, &fl4, &res, FIB_LOOKUP_NOREF); |
246955fe RO |
922 | |
923 | if (!frn->err) { | |
924 | frn->prefixlen = res.prefixlen; | |
925 | frn->nh_sel = res.nh_sel; | |
926 | frn->type = res.type; | |
927 | frn->scope = res.scope; | |
928 | } | |
ebc0ffae | 929 | rcu_read_unlock(); |
246955fe RO |
930 | local_bh_enable(); |
931 | } | |
932 | } | |
933 | ||
28f7b036 | 934 | static void nl_fib_input(struct sk_buff *skb) |
246955fe | 935 | { |
6bd48fcf | 936 | struct net *net; |
246955fe | 937 | struct fib_result_nl *frn; |
28f7b036 | 938 | struct nlmsghdr *nlh; |
246955fe | 939 | struct fib_table *tb; |
28f7b036 | 940 | u32 pid; |
1194ed0a | 941 | |
3b1e0a65 | 942 | net = sock_net(skb->sk); |
b529ccf2 | 943 | nlh = nlmsg_hdr(skb); |
ea86575e | 944 | if (skb->len < NLMSG_SPACE(0) || skb->len < nlh->nlmsg_len || |
d883a036 | 945 | nlh->nlmsg_len < NLMSG_LENGTH(sizeof(*frn))) |
ea86575e | 946 | return; |
d883a036 DL |
947 | |
948 | skb = skb_clone(skb, GFP_KERNEL); | |
949 | if (skb == NULL) | |
950 | return; | |
951 | nlh = nlmsg_hdr(skb); | |
e905a9ed | 952 | |
246955fe | 953 | frn = (struct fib_result_nl *) NLMSG_DATA(nlh); |
6bd48fcf | 954 | tb = fib_get_table(net, frn->tb_id_in); |
246955fe RO |
955 | |
956 | nl_fib_lookup(frn, tb); | |
e905a9ed | 957 | |
6a31d2a9 ED |
958 | pid = NETLINK_CB(skb).pid; /* pid of sending process */ |
959 | NETLINK_CB(skb).pid = 0; /* from kernel */ | |
ac6d439d | 960 | NETLINK_CB(skb).dst_group = 0; /* unicast */ |
6bd48fcf | 961 | netlink_unicast(net->ipv4.fibnl, skb, pid, MSG_DONTWAIT); |
e905a9ed | 962 | } |
246955fe | 963 | |
2c8c1e72 | 964 | static int __net_init nl_fib_lookup_init(struct net *net) |
246955fe | 965 | { |
6bd48fcf DL |
966 | struct sock *sk; |
967 | sk = netlink_kernel_create(net, NETLINK_FIB_LOOKUP, 0, | |
968 | nl_fib_input, NULL, THIS_MODULE); | |
969 | if (sk == NULL) | |
7b1a74fd | 970 | return -EAFNOSUPPORT; |
6bd48fcf | 971 | net->ipv4.fibnl = sk; |
7b1a74fd DL |
972 | return 0; |
973 | } | |
974 | ||
975 | static void nl_fib_lookup_exit(struct net *net) | |
976 | { | |
b7c6ba6e | 977 | netlink_kernel_release(net->ipv4.fibnl); |
775516bf | 978 | net->ipv4.fibnl = NULL; |
246955fe RO |
979 | } |
980 | ||
e2ce1468 | 981 | static void fib_disable_ip(struct net_device *dev, int force, int delay) |
1da177e4 | 982 | { |
85326fa5 | 983 | if (fib_sync_down_dev(dev, force)) |
c346dca1 | 984 | fib_flush(dev_net(dev)); |
e2ce1468 | 985 | rt_cache_flush(dev_net(dev), delay); |
1da177e4 LT |
986 | arp_ifdown(dev); |
987 | } | |
988 | ||
989 | static int fib_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr) | |
990 | { | |
6ed2533e | 991 | struct in_ifaddr *ifa = (struct in_ifaddr *)ptr; |
76e6ebfb | 992 | struct net_device *dev = ifa->ifa_dev->dev; |
436c3b66 | 993 | struct net *net = dev_net(dev); |
1da177e4 LT |
994 | |
995 | switch (event) { | |
996 | case NETDEV_UP: | |
997 | fib_add_ifaddr(ifa); | |
998 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
76e6ebfb | 999 | fib_sync_up(dev); |
1da177e4 | 1000 | #endif |
436c3b66 | 1001 | atomic_inc(&net->ipv4.dev_addr_genid); |
76e6ebfb | 1002 | rt_cache_flush(dev_net(dev), -1); |
1da177e4 LT |
1003 | break; |
1004 | case NETDEV_DOWN: | |
e6abbaa2 | 1005 | fib_del_ifaddr(ifa, NULL); |
436c3b66 | 1006 | atomic_inc(&net->ipv4.dev_addr_genid); |
9fcc2e8a | 1007 | if (ifa->ifa_dev->ifa_list == NULL) { |
1da177e4 | 1008 | /* Last address was deleted from this interface. |
6a31d2a9 | 1009 | * Disable IP. |
1da177e4 | 1010 | */ |
e2ce1468 | 1011 | fib_disable_ip(dev, 1, 0); |
1da177e4 | 1012 | } else { |
76e6ebfb | 1013 | rt_cache_flush(dev_net(dev), -1); |
1da177e4 LT |
1014 | } |
1015 | break; | |
1016 | } | |
1017 | return NOTIFY_DONE; | |
1018 | } | |
1019 | ||
1020 | static int fib_netdev_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1021 | { | |
1022 | struct net_device *dev = ptr; | |
e5ed6399 | 1023 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
436c3b66 | 1024 | struct net *net = dev_net(dev); |
1da177e4 LT |
1025 | |
1026 | if (event == NETDEV_UNREGISTER) { | |
e2ce1468 | 1027 | fib_disable_ip(dev, 2, -1); |
1da177e4 LT |
1028 | return NOTIFY_DONE; |
1029 | } | |
1030 | ||
1031 | if (!in_dev) | |
1032 | return NOTIFY_DONE; | |
1033 | ||
1034 | switch (event) { | |
1035 | case NETDEV_UP: | |
1036 | for_ifa(in_dev) { | |
1037 | fib_add_ifaddr(ifa); | |
1038 | } endfor_ifa(in_dev); | |
1039 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
1040 | fib_sync_up(dev); | |
1041 | #endif | |
436c3b66 | 1042 | atomic_inc(&net->ipv4.dev_addr_genid); |
76e6ebfb | 1043 | rt_cache_flush(dev_net(dev), -1); |
1da177e4 LT |
1044 | break; |
1045 | case NETDEV_DOWN: | |
e2ce1468 | 1046 | fib_disable_ip(dev, 0, 0); |
1da177e4 LT |
1047 | break; |
1048 | case NETDEV_CHANGEMTU: | |
1049 | case NETDEV_CHANGE: | |
76e6ebfb | 1050 | rt_cache_flush(dev_net(dev), 0); |
1da177e4 | 1051 | break; |
a5ee1551 | 1052 | case NETDEV_UNREGISTER_BATCH: |
6561a3b1 DM |
1053 | /* The batch unregister is only called on the first |
1054 | * device in the list of devices being unregistered. | |
1055 | * Therefore we should not pass dev_net(dev) in here. | |
1056 | */ | |
1057 | rt_cache_flush_batch(NULL); | |
a5ee1551 | 1058 | break; |
1da177e4 LT |
1059 | } |
1060 | return NOTIFY_DONE; | |
1061 | } | |
1062 | ||
1063 | static struct notifier_block fib_inetaddr_notifier = { | |
6ed2533e | 1064 | .notifier_call = fib_inetaddr_event, |
1da177e4 LT |
1065 | }; |
1066 | ||
1067 | static struct notifier_block fib_netdev_notifier = { | |
6ed2533e | 1068 | .notifier_call = fib_netdev_event, |
1da177e4 LT |
1069 | }; |
1070 | ||
7b1a74fd | 1071 | static int __net_init ip_fib_net_init(struct net *net) |
1da177e4 | 1072 | { |
dce5cbee | 1073 | int err; |
10da66f7 ED |
1074 | size_t size = sizeof(struct hlist_head) * FIB_TABLE_HASHSZ; |
1075 | ||
1076 | /* Avoid false sharing : Use at least a full cache line */ | |
1077 | size = max_t(size_t, size, L1_CACHE_BYTES); | |
1af5a8c4 | 1078 | |
10da66f7 | 1079 | net->ipv4.fib_table_hash = kzalloc(size, GFP_KERNEL); |
e4aef8ae DL |
1080 | if (net->ipv4.fib_table_hash == NULL) |
1081 | return -ENOMEM; | |
1082 | ||
dce5cbee DL |
1083 | err = fib4_rules_init(net); |
1084 | if (err < 0) | |
1085 | goto fail; | |
1086 | return 0; | |
1087 | ||
1088 | fail: | |
1089 | kfree(net->ipv4.fib_table_hash); | |
1090 | return err; | |
7b1a74fd | 1091 | } |
1da177e4 | 1092 | |
2c8c1e72 | 1093 | static void ip_fib_net_exit(struct net *net) |
7b1a74fd DL |
1094 | { |
1095 | unsigned int i; | |
1096 | ||
1097 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
1098 | fib4_rules_exit(net); | |
1099 | #endif | |
1100 | ||
e2666f84 | 1101 | rtnl_lock(); |
7b1a74fd DL |
1102 | for (i = 0; i < FIB_TABLE_HASHSZ; i++) { |
1103 | struct fib_table *tb; | |
1104 | struct hlist_head *head; | |
1105 | struct hlist_node *node, *tmp; | |
63f3444f | 1106 | |
e4aef8ae | 1107 | head = &net->ipv4.fib_table_hash[i]; |
7b1a74fd DL |
1108 | hlist_for_each_entry_safe(tb, node, tmp, head, tb_hlist) { |
1109 | hlist_del(node); | |
16c6cf8b | 1110 | fib_table_flush(tb); |
4aa2c466 | 1111 | fib_free_table(tb); |
7b1a74fd DL |
1112 | } |
1113 | } | |
e2666f84 | 1114 | rtnl_unlock(); |
e4aef8ae | 1115 | kfree(net->ipv4.fib_table_hash); |
7b1a74fd DL |
1116 | } |
1117 | ||
1118 | static int __net_init fib_net_init(struct net *net) | |
1119 | { | |
1120 | int error; | |
1121 | ||
7b1a74fd DL |
1122 | error = ip_fib_net_init(net); |
1123 | if (error < 0) | |
1124 | goto out; | |
1125 | error = nl_fib_lookup_init(net); | |
1126 | if (error < 0) | |
1127 | goto out_nlfl; | |
1128 | error = fib_proc_init(net); | |
1129 | if (error < 0) | |
1130 | goto out_proc; | |
1131 | out: | |
1132 | return error; | |
1133 | ||
1134 | out_proc: | |
1135 | nl_fib_lookup_exit(net); | |
1136 | out_nlfl: | |
1137 | ip_fib_net_exit(net); | |
1138 | goto out; | |
1139 | } | |
1140 | ||
1141 | static void __net_exit fib_net_exit(struct net *net) | |
1142 | { | |
1143 | fib_proc_exit(net); | |
1144 | nl_fib_lookup_exit(net); | |
1145 | ip_fib_net_exit(net); | |
1146 | } | |
1147 | ||
1148 | static struct pernet_operations fib_net_ops = { | |
1149 | .init = fib_net_init, | |
1150 | .exit = fib_net_exit, | |
1151 | }; | |
1152 | ||
1153 | void __init ip_fib_init(void) | |
1154 | { | |
c7ac8679 GR |
1155 | rtnl_register(PF_INET, RTM_NEWROUTE, inet_rtm_newroute, NULL, NULL); |
1156 | rtnl_register(PF_INET, RTM_DELROUTE, inet_rtm_delroute, NULL, NULL); | |
1157 | rtnl_register(PF_INET, RTM_GETROUTE, NULL, inet_dump_fib, NULL); | |
7b1a74fd DL |
1158 | |
1159 | register_pernet_subsys(&fib_net_ops); | |
1160 | register_netdevice_notifier(&fib_netdev_notifier); | |
1161 | register_inetaddr_notifier(&fib_inetaddr_notifier); | |
7f9b8052 | 1162 | |
5348ba85 | 1163 | fib_trie_init(); |
1da177e4 | 1164 | } |