]>
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; | |
a207a4b2 | 188 | struct rtable *rt; |
35ebf65e DM |
189 | struct flowi4 fl4; |
190 | struct net *net; | |
a207a4b2 | 191 | int scope; |
35ebf65e | 192 | |
a207a4b2 DM |
193 | rt = skb_rtable(skb); |
194 | if (!(rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) | |
35ebf65e DM |
195 | return ip_hdr(skb)->daddr; |
196 | ||
197 | in_dev = __in_dev_get_rcu(dev); | |
198 | BUG_ON(!in_dev); | |
35ebf65e DM |
199 | |
200 | net = dev_net(dev); | |
a207a4b2 DM |
201 | |
202 | scope = RT_SCOPE_UNIVERSE; | |
203 | if (!ipv4_is_zeronet(ip_hdr(skb)->saddr)) { | |
204 | fl4.flowi4_oif = 0; | |
205 | fl4.flowi4_iif = net->loopback_dev->ifindex; | |
206 | fl4.daddr = ip_hdr(skb)->saddr; | |
207 | fl4.saddr = 0; | |
208 | fl4.flowi4_tos = RT_TOS(ip_hdr(skb)->tos); | |
209 | fl4.flowi4_scope = scope; | |
210 | fl4.flowi4_mark = IN_DEV_SRC_VMARK(in_dev) ? skb->mark : 0; | |
211 | if (!fib_lookup(net, &fl4, &res)) | |
212 | return FIB_RES_PREFSRC(net, res); | |
213 | } else { | |
214 | scope = RT_SCOPE_LINK; | |
215 | } | |
216 | ||
217 | return inet_select_addr(dev, ip_hdr(skb)->saddr, scope); | |
35ebf65e DM |
218 | } |
219 | ||
1da177e4 | 220 | /* Given (packet source, input interface) and optional (dst, oif, tos): |
6a31d2a9 ED |
221 | * - (main) check, that source is valid i.e. not broadcast or our local |
222 | * address. | |
223 | * - figure out what "logical" interface this packet arrived | |
224 | * and calculate "specific destination" address. | |
225 | * - check, that packet arrived from expected physical interface. | |
ebc0ffae | 226 | * called with rcu_read_lock() |
1da177e4 | 227 | */ |
5c04c819 | 228 | int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst, u8 tos, |
41347dcd | 229 | int oif, struct net_device *dev, u32 *itag) |
1da177e4 LT |
230 | { |
231 | struct in_device *in_dev; | |
9ade2286 | 232 | struct flowi4 fl4; |
1da177e4 | 233 | struct fib_result res; |
8153a10c | 234 | int no_addr, rpf, accept_local; |
6f86b325 | 235 | bool dev_match; |
1da177e4 | 236 | int ret; |
5b707aaa | 237 | struct net *net; |
1da177e4 | 238 | |
9ade2286 DM |
239 | fl4.flowi4_oif = 0; |
240 | fl4.flowi4_iif = oif; | |
9ade2286 DM |
241 | fl4.daddr = src; |
242 | fl4.saddr = dst; | |
243 | fl4.flowi4_tos = tos; | |
244 | fl4.flowi4_scope = RT_SCOPE_UNIVERSE; | |
cc7e17ea | 245 | |
8153a10c | 246 | no_addr = rpf = accept_local = 0; |
e5ed6399 | 247 | in_dev = __in_dev_get_rcu(dev); |
1da177e4 LT |
248 | if (in_dev) { |
249 | no_addr = in_dev->ifa_list == NULL; | |
990078af MS |
250 | |
251 | /* Ignore rp_filter for packets protected by IPsec. */ | |
252 | rpf = secpath_exists(skb) ? 0 : IN_DEV_RPFILTER(in_dev); | |
253 | ||
8153a10c | 254 | accept_local = IN_DEV_ACCEPT_LOCAL(in_dev); |
5c04c819 | 255 | fl4.flowi4_mark = IN_DEV_SRC_VMARK(in_dev) ? skb->mark : 0; |
1da177e4 | 256 | } |
1da177e4 LT |
257 | |
258 | if (in_dev == NULL) | |
259 | goto e_inval; | |
260 | ||
c346dca1 | 261 | net = dev_net(dev); |
9ade2286 | 262 | if (fib_lookup(net, &fl4, &res)) |
1da177e4 | 263 | goto last_resort; |
8153a10c PM |
264 | if (res.type != RTN_UNICAST) { |
265 | if (res.type != RTN_LOCAL || !accept_local) | |
ebc0ffae | 266 | goto e_inval; |
8153a10c | 267 | } |
1da177e4 | 268 | fib_combine_itag(itag, &res); |
6f86b325 DM |
269 | dev_match = false; |
270 | ||
1da177e4 | 271 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
6f86b325 DM |
272 | for (ret = 0; ret < res.fi->fib_nhs; ret++) { |
273 | struct fib_nh *nh = &res.fi->fib_nh[ret]; | |
274 | ||
275 | if (nh->nh_dev == dev) { | |
276 | dev_match = true; | |
277 | break; | |
278 | } | |
279 | } | |
1da177e4 LT |
280 | #else |
281 | if (FIB_RES_DEV(res) == dev) | |
6f86b325 | 282 | dev_match = true; |
1da177e4 | 283 | #endif |
6f86b325 | 284 | if (dev_match) { |
1da177e4 | 285 | ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST; |
1da177e4 LT |
286 | return ret; |
287 | } | |
1da177e4 LT |
288 | if (no_addr) |
289 | goto last_resort; | |
c1cf8422 | 290 | if (rpf == 1) |
b5f7e755 | 291 | goto e_rpf; |
9ade2286 | 292 | fl4.flowi4_oif = dev->ifindex; |
1da177e4 LT |
293 | |
294 | ret = 0; | |
9ade2286 | 295 | if (fib_lookup(net, &fl4, &res) == 0) { |
41347dcd | 296 | if (res.type == RTN_UNICAST) |
1da177e4 | 297 | ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST; |
1da177e4 LT |
298 | } |
299 | return ret; | |
300 | ||
301 | last_resort: | |
302 | if (rpf) | |
b5f7e755 | 303 | goto e_rpf; |
1da177e4 LT |
304 | *itag = 0; |
305 | return 0; | |
306 | ||
1da177e4 LT |
307 | e_inval: |
308 | return -EINVAL; | |
b5f7e755 ED |
309 | e_rpf: |
310 | return -EXDEV; | |
1da177e4 LT |
311 | } |
312 | ||
81f7bf6c | 313 | static inline __be32 sk_extract_addr(struct sockaddr *addr) |
4e902c57 TG |
314 | { |
315 | return ((struct sockaddr_in *) addr)->sin_addr.s_addr; | |
316 | } | |
317 | ||
318 | static int put_rtax(struct nlattr *mx, int len, int type, u32 value) | |
319 | { | |
320 | struct nlattr *nla; | |
321 | ||
322 | nla = (struct nlattr *) ((char *) mx + len); | |
323 | nla->nla_type = type; | |
324 | nla->nla_len = nla_attr_size(4); | |
325 | *(u32 *) nla_data(nla) = value; | |
326 | ||
327 | return len + nla_total_size(4); | |
328 | } | |
329 | ||
4b5d47d4 | 330 | static int rtentry_to_fib_config(struct net *net, int cmd, struct rtentry *rt, |
4e902c57 TG |
331 | struct fib_config *cfg) |
332 | { | |
6d85c10a | 333 | __be32 addr; |
4e902c57 TG |
334 | int plen; |
335 | ||
336 | memset(cfg, 0, sizeof(*cfg)); | |
4b5d47d4 | 337 | cfg->fc_nlinfo.nl_net = net; |
4e902c57 TG |
338 | |
339 | if (rt->rt_dst.sa_family != AF_INET) | |
340 | return -EAFNOSUPPORT; | |
341 | ||
342 | /* | |
343 | * Check mask for validity: | |
344 | * a) it must be contiguous. | |
345 | * b) destination must have all host bits clear. | |
346 | * c) if application forgot to set correct family (AF_INET), | |
347 | * reject request unless it is absolutely clear i.e. | |
348 | * both family and mask are zero. | |
349 | */ | |
350 | plen = 32; | |
351 | addr = sk_extract_addr(&rt->rt_dst); | |
352 | if (!(rt->rt_flags & RTF_HOST)) { | |
81f7bf6c | 353 | __be32 mask = sk_extract_addr(&rt->rt_genmask); |
4e902c57 TG |
354 | |
355 | if (rt->rt_genmask.sa_family != AF_INET) { | |
356 | if (mask || rt->rt_genmask.sa_family) | |
357 | return -EAFNOSUPPORT; | |
358 | } | |
359 | ||
360 | if (bad_mask(mask, addr)) | |
361 | return -EINVAL; | |
362 | ||
363 | plen = inet_mask_len(mask); | |
364 | } | |
365 | ||
366 | cfg->fc_dst_len = plen; | |
367 | cfg->fc_dst = addr; | |
368 | ||
369 | if (cmd != SIOCDELRT) { | |
370 | cfg->fc_nlflags = NLM_F_CREATE; | |
371 | cfg->fc_protocol = RTPROT_BOOT; | |
372 | } | |
373 | ||
374 | if (rt->rt_metric) | |
375 | cfg->fc_priority = rt->rt_metric - 1; | |
376 | ||
377 | if (rt->rt_flags & RTF_REJECT) { | |
378 | cfg->fc_scope = RT_SCOPE_HOST; | |
379 | cfg->fc_type = RTN_UNREACHABLE; | |
380 | return 0; | |
381 | } | |
382 | ||
383 | cfg->fc_scope = RT_SCOPE_NOWHERE; | |
384 | cfg->fc_type = RTN_UNICAST; | |
385 | ||
386 | if (rt->rt_dev) { | |
387 | char *colon; | |
388 | struct net_device *dev; | |
389 | char devname[IFNAMSIZ]; | |
390 | ||
391 | if (copy_from_user(devname, rt->rt_dev, IFNAMSIZ-1)) | |
392 | return -EFAULT; | |
393 | ||
394 | devname[IFNAMSIZ-1] = 0; | |
395 | colon = strchr(devname, ':'); | |
396 | if (colon) | |
397 | *colon = 0; | |
4b5d47d4 | 398 | dev = __dev_get_by_name(net, devname); |
4e902c57 TG |
399 | if (!dev) |
400 | return -ENODEV; | |
401 | cfg->fc_oif = dev->ifindex; | |
402 | if (colon) { | |
403 | struct in_ifaddr *ifa; | |
404 | struct in_device *in_dev = __in_dev_get_rtnl(dev); | |
405 | if (!in_dev) | |
406 | return -ENODEV; | |
407 | *colon = ':'; | |
408 | for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) | |
409 | if (strcmp(ifa->ifa_label, devname) == 0) | |
410 | break; | |
411 | if (ifa == NULL) | |
412 | return -ENODEV; | |
413 | cfg->fc_prefsrc = ifa->ifa_local; | |
414 | } | |
415 | } | |
416 | ||
417 | addr = sk_extract_addr(&rt->rt_gateway); | |
418 | if (rt->rt_gateway.sa_family == AF_INET && addr) { | |
419 | cfg->fc_gw = addr; | |
420 | if (rt->rt_flags & RTF_GATEWAY && | |
4b5d47d4 | 421 | inet_addr_type(net, addr) == RTN_UNICAST) |
4e902c57 TG |
422 | cfg->fc_scope = RT_SCOPE_UNIVERSE; |
423 | } | |
424 | ||
425 | if (cmd == SIOCDELRT) | |
426 | return 0; | |
427 | ||
428 | if (rt->rt_flags & RTF_GATEWAY && !cfg->fc_gw) | |
429 | return -EINVAL; | |
430 | ||
431 | if (cfg->fc_scope == RT_SCOPE_NOWHERE) | |
432 | cfg->fc_scope = RT_SCOPE_LINK; | |
433 | ||
434 | if (rt->rt_flags & (RTF_MTU | RTF_WINDOW | RTF_IRTT)) { | |
435 | struct nlattr *mx; | |
436 | int len = 0; | |
437 | ||
438 | mx = kzalloc(3 * nla_total_size(4), GFP_KERNEL); | |
e905a9ed | 439 | if (mx == NULL) |
4e902c57 TG |
440 | return -ENOMEM; |
441 | ||
442 | if (rt->rt_flags & RTF_MTU) | |
443 | len = put_rtax(mx, len, RTAX_ADVMSS, rt->rt_mtu - 40); | |
444 | ||
445 | if (rt->rt_flags & RTF_WINDOW) | |
446 | len = put_rtax(mx, len, RTAX_WINDOW, rt->rt_window); | |
447 | ||
448 | if (rt->rt_flags & RTF_IRTT) | |
449 | len = put_rtax(mx, len, RTAX_RTT, rt->rt_irtt << 3); | |
450 | ||
451 | cfg->fc_mx = mx; | |
452 | cfg->fc_mx_len = len; | |
453 | } | |
454 | ||
455 | return 0; | |
456 | } | |
457 | ||
1da177e4 | 458 | /* |
6a31d2a9 ED |
459 | * Handle IP routing ioctl calls. |
460 | * These are used to manipulate the routing tables | |
1da177e4 | 461 | */ |
1bad118a | 462 | int ip_rt_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
1da177e4 | 463 | { |
4e902c57 TG |
464 | struct fib_config cfg; |
465 | struct rtentry rt; | |
1da177e4 | 466 | int err; |
1da177e4 LT |
467 | |
468 | switch (cmd) { | |
469 | case SIOCADDRT: /* Add a route */ | |
470 | case SIOCDELRT: /* Delete a route */ | |
471 | if (!capable(CAP_NET_ADMIN)) | |
472 | return -EPERM; | |
4e902c57 TG |
473 | |
474 | if (copy_from_user(&rt, arg, sizeof(rt))) | |
1da177e4 | 475 | return -EFAULT; |
4e902c57 | 476 | |
1da177e4 | 477 | rtnl_lock(); |
1bad118a | 478 | err = rtentry_to_fib_config(net, cmd, &rt, &cfg); |
1da177e4 | 479 | if (err == 0) { |
4e902c57 TG |
480 | struct fib_table *tb; |
481 | ||
1da177e4 | 482 | if (cmd == SIOCDELRT) { |
1bad118a | 483 | tb = fib_get_table(net, cfg.fc_table); |
1da177e4 | 484 | if (tb) |
16c6cf8b | 485 | err = fib_table_delete(tb, &cfg); |
4e902c57 TG |
486 | else |
487 | err = -ESRCH; | |
1da177e4 | 488 | } else { |
1bad118a | 489 | tb = fib_new_table(net, cfg.fc_table); |
1da177e4 | 490 | if (tb) |
16c6cf8b | 491 | err = fib_table_insert(tb, &cfg); |
4e902c57 TG |
492 | else |
493 | err = -ENOBUFS; | |
1da177e4 | 494 | } |
4e902c57 TG |
495 | |
496 | /* allocated by rtentry_to_fib_config() */ | |
497 | kfree(cfg.fc_mx); | |
1da177e4 LT |
498 | } |
499 | rtnl_unlock(); | |
500 | return err; | |
501 | } | |
502 | return -EINVAL; | |
503 | } | |
504 | ||
6a31d2a9 | 505 | const struct nla_policy rtm_ipv4_policy[RTA_MAX + 1] = { |
4e902c57 TG |
506 | [RTA_DST] = { .type = NLA_U32 }, |
507 | [RTA_SRC] = { .type = NLA_U32 }, | |
508 | [RTA_IIF] = { .type = NLA_U32 }, | |
509 | [RTA_OIF] = { .type = NLA_U32 }, | |
510 | [RTA_GATEWAY] = { .type = NLA_U32 }, | |
511 | [RTA_PRIORITY] = { .type = NLA_U32 }, | |
512 | [RTA_PREFSRC] = { .type = NLA_U32 }, | |
513 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
5176f91e | 514 | [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) }, |
4e902c57 | 515 | [RTA_FLOW] = { .type = NLA_U32 }, |
4e902c57 TG |
516 | }; |
517 | ||
4b5d47d4 | 518 | static int rtm_to_fib_config(struct net *net, struct sk_buff *skb, |
6a31d2a9 | 519 | struct nlmsghdr *nlh, struct fib_config *cfg) |
1da177e4 | 520 | { |
4e902c57 TG |
521 | struct nlattr *attr; |
522 | int err, remaining; | |
523 | struct rtmsg *rtm; | |
524 | ||
525 | err = nlmsg_validate(nlh, sizeof(*rtm), RTA_MAX, rtm_ipv4_policy); | |
526 | if (err < 0) | |
527 | goto errout; | |
528 | ||
529 | memset(cfg, 0, sizeof(*cfg)); | |
530 | ||
531 | rtm = nlmsg_data(nlh); | |
4e902c57 | 532 | cfg->fc_dst_len = rtm->rtm_dst_len; |
4e902c57 TG |
533 | cfg->fc_tos = rtm->rtm_tos; |
534 | cfg->fc_table = rtm->rtm_table; | |
535 | cfg->fc_protocol = rtm->rtm_protocol; | |
536 | cfg->fc_scope = rtm->rtm_scope; | |
537 | cfg->fc_type = rtm->rtm_type; | |
538 | cfg->fc_flags = rtm->rtm_flags; | |
539 | cfg->fc_nlflags = nlh->nlmsg_flags; | |
540 | ||
541 | cfg->fc_nlinfo.pid = NETLINK_CB(skb).pid; | |
542 | cfg->fc_nlinfo.nlh = nlh; | |
4b5d47d4 | 543 | cfg->fc_nlinfo.nl_net = net; |
4e902c57 | 544 | |
a0ee18b9 TG |
545 | if (cfg->fc_type > RTN_MAX) { |
546 | err = -EINVAL; | |
547 | goto errout; | |
548 | } | |
549 | ||
4e902c57 | 550 | nlmsg_for_each_attr(attr, nlh, sizeof(struct rtmsg), remaining) { |
8f4c1f9b | 551 | switch (nla_type(attr)) { |
4e902c57 | 552 | case RTA_DST: |
17fb2c64 | 553 | cfg->fc_dst = nla_get_be32(attr); |
4e902c57 | 554 | break; |
4e902c57 TG |
555 | case RTA_OIF: |
556 | cfg->fc_oif = nla_get_u32(attr); | |
557 | break; | |
558 | case RTA_GATEWAY: | |
17fb2c64 | 559 | cfg->fc_gw = nla_get_be32(attr); |
4e902c57 TG |
560 | break; |
561 | case RTA_PRIORITY: | |
562 | cfg->fc_priority = nla_get_u32(attr); | |
563 | break; | |
564 | case RTA_PREFSRC: | |
17fb2c64 | 565 | cfg->fc_prefsrc = nla_get_be32(attr); |
4e902c57 TG |
566 | break; |
567 | case RTA_METRICS: | |
568 | cfg->fc_mx = nla_data(attr); | |
569 | cfg->fc_mx_len = nla_len(attr); | |
570 | break; | |
571 | case RTA_MULTIPATH: | |
572 | cfg->fc_mp = nla_data(attr); | |
573 | cfg->fc_mp_len = nla_len(attr); | |
574 | break; | |
575 | case RTA_FLOW: | |
576 | cfg->fc_flow = nla_get_u32(attr); | |
577 | break; | |
4e902c57 TG |
578 | case RTA_TABLE: |
579 | cfg->fc_table = nla_get_u32(attr); | |
580 | break; | |
1da177e4 LT |
581 | } |
582 | } | |
4e902c57 | 583 | |
1da177e4 | 584 | return 0; |
4e902c57 TG |
585 | errout: |
586 | return err; | |
1da177e4 LT |
587 | } |
588 | ||
6ed2533e | 589 | static int inet_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) |
1da177e4 | 590 | { |
3b1e0a65 | 591 | struct net *net = sock_net(skb->sk); |
4e902c57 TG |
592 | struct fib_config cfg; |
593 | struct fib_table *tb; | |
594 | int err; | |
1da177e4 | 595 | |
4b5d47d4 | 596 | err = rtm_to_fib_config(net, skb, nlh, &cfg); |
4e902c57 TG |
597 | if (err < 0) |
598 | goto errout; | |
1da177e4 | 599 | |
8ad4942c | 600 | tb = fib_get_table(net, cfg.fc_table); |
4e902c57 TG |
601 | if (tb == NULL) { |
602 | err = -ESRCH; | |
603 | goto errout; | |
604 | } | |
605 | ||
16c6cf8b | 606 | err = fib_table_delete(tb, &cfg); |
4e902c57 TG |
607 | errout: |
608 | return err; | |
1da177e4 LT |
609 | } |
610 | ||
6ed2533e | 611 | static int inet_rtm_newroute(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 | |
226b0b4a | 622 | tb = fib_new_table(net, cfg.fc_table); |
4e902c57 TG |
623 | if (tb == NULL) { |
624 | err = -ENOBUFS; | |
625 | goto errout; | |
626 | } | |
627 | ||
16c6cf8b | 628 | err = fib_table_insert(tb, &cfg); |
4e902c57 TG |
629 | errout: |
630 | return err; | |
1da177e4 LT |
631 | } |
632 | ||
63f3444f | 633 | static int inet_dump_fib(struct sk_buff *skb, struct netlink_callback *cb) |
1da177e4 | 634 | { |
3b1e0a65 | 635 | struct net *net = sock_net(skb->sk); |
1af5a8c4 PM |
636 | unsigned int h, s_h; |
637 | unsigned int e = 0, s_e; | |
1da177e4 | 638 | struct fib_table *tb; |
1af5a8c4 | 639 | struct hlist_node *node; |
e4aef8ae | 640 | struct hlist_head *head; |
1af5a8c4 | 641 | int dumped = 0; |
1da177e4 | 642 | |
be403ea1 TG |
643 | if (nlmsg_len(cb->nlh) >= sizeof(struct rtmsg) && |
644 | ((struct rtmsg *) nlmsg_data(cb->nlh))->rtm_flags & RTM_F_CLONED) | |
1da177e4 LT |
645 | return ip_rt_dump(skb, cb); |
646 | ||
1af5a8c4 PM |
647 | s_h = cb->args[0]; |
648 | s_e = cb->args[1]; | |
649 | ||
650 | for (h = s_h; h < FIB_TABLE_HASHSZ; h++, s_e = 0) { | |
651 | e = 0; | |
e4aef8ae DL |
652 | head = &net->ipv4.fib_table_hash[h]; |
653 | hlist_for_each_entry(tb, node, head, tb_hlist) { | |
1af5a8c4 PM |
654 | if (e < s_e) |
655 | goto next; | |
656 | if (dumped) | |
657 | memset(&cb->args[2], 0, sizeof(cb->args) - | |
e905a9ed | 658 | 2 * sizeof(cb->args[0])); |
16c6cf8b | 659 | if (fib_table_dump(tb, skb, cb) < 0) |
1af5a8c4 PM |
660 | goto out; |
661 | dumped = 1; | |
662 | next: | |
663 | e++; | |
664 | } | |
1da177e4 | 665 | } |
1af5a8c4 PM |
666 | out: |
667 | cb->args[1] = e; | |
668 | cb->args[0] = h; | |
1da177e4 LT |
669 | |
670 | return skb->len; | |
671 | } | |
672 | ||
673 | /* Prepare and feed intra-kernel routing request. | |
6a31d2a9 ED |
674 | * Really, it should be netlink message, but :-( netlink |
675 | * can be not configured, so that we feed it directly | |
676 | * to fib engine. It is legal, because all events occur | |
677 | * only when netlink is already locked. | |
1da177e4 | 678 | */ |
81f7bf6c | 679 | static void fib_magic(int cmd, int type, __be32 dst, int dst_len, struct in_ifaddr *ifa) |
1da177e4 | 680 | { |
c346dca1 | 681 | struct net *net = dev_net(ifa->ifa_dev->dev); |
4e902c57 TG |
682 | struct fib_table *tb; |
683 | struct fib_config cfg = { | |
684 | .fc_protocol = RTPROT_KERNEL, | |
685 | .fc_type = type, | |
686 | .fc_dst = dst, | |
687 | .fc_dst_len = dst_len, | |
688 | .fc_prefsrc = ifa->ifa_local, | |
689 | .fc_oif = ifa->ifa_dev->dev->ifindex, | |
690 | .fc_nlflags = NLM_F_CREATE | NLM_F_APPEND, | |
4d1169c1 | 691 | .fc_nlinfo = { |
4b5d47d4 | 692 | .nl_net = net, |
4d1169c1 | 693 | }, |
4e902c57 | 694 | }; |
1da177e4 LT |
695 | |
696 | if (type == RTN_UNICAST) | |
4b5d47d4 | 697 | tb = fib_new_table(net, RT_TABLE_MAIN); |
1da177e4 | 698 | else |
4b5d47d4 | 699 | tb = fib_new_table(net, RT_TABLE_LOCAL); |
1da177e4 LT |
700 | |
701 | if (tb == NULL) | |
702 | return; | |
703 | ||
4e902c57 | 704 | cfg.fc_table = tb->tb_id; |
1da177e4 | 705 | |
4e902c57 TG |
706 | if (type != RTN_LOCAL) |
707 | cfg.fc_scope = RT_SCOPE_LINK; | |
708 | else | |
709 | cfg.fc_scope = RT_SCOPE_HOST; | |
1da177e4 LT |
710 | |
711 | if (cmd == RTM_NEWROUTE) | |
16c6cf8b | 712 | fib_table_insert(tb, &cfg); |
1da177e4 | 713 | else |
16c6cf8b | 714 | fib_table_delete(tb, &cfg); |
1da177e4 LT |
715 | } |
716 | ||
0ff60a45 | 717 | void fib_add_ifaddr(struct in_ifaddr *ifa) |
1da177e4 LT |
718 | { |
719 | struct in_device *in_dev = ifa->ifa_dev; | |
720 | struct net_device *dev = in_dev->dev; | |
721 | struct in_ifaddr *prim = ifa; | |
a144ea4b AV |
722 | __be32 mask = ifa->ifa_mask; |
723 | __be32 addr = ifa->ifa_local; | |
6a31d2a9 | 724 | __be32 prefix = ifa->ifa_address & mask; |
1da177e4 | 725 | |
6a31d2a9 | 726 | if (ifa->ifa_flags & IFA_F_SECONDARY) { |
1da177e4 LT |
727 | prim = inet_ifa_byprefix(in_dev, prefix, mask); |
728 | if (prim == NULL) { | |
058bd4d2 | 729 | pr_warn("%s: bug: prim == NULL\n", __func__); |
1da177e4 LT |
730 | return; |
731 | } | |
732 | } | |
733 | ||
734 | fib_magic(RTM_NEWROUTE, RTN_LOCAL, addr, 32, prim); | |
735 | ||
6a31d2a9 | 736 | if (!(dev->flags & IFF_UP)) |
1da177e4 LT |
737 | return; |
738 | ||
739 | /* Add broadcast address, if it is explicitly assigned. */ | |
a144ea4b | 740 | if (ifa->ifa_broadcast && ifa->ifa_broadcast != htonl(0xFFFFFFFF)) |
1da177e4 LT |
741 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim); |
742 | ||
6a31d2a9 | 743 | if (!ipv4_is_zeronet(prefix) && !(ifa->ifa_flags & IFA_F_SECONDARY) && |
1da177e4 | 744 | (prefix != addr || ifa->ifa_prefixlen < 32)) { |
6a31d2a9 ED |
745 | fib_magic(RTM_NEWROUTE, |
746 | dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST, | |
747 | prefix, ifa->ifa_prefixlen, prim); | |
1da177e4 LT |
748 | |
749 | /* Add network specific broadcasts, when it takes a sense */ | |
750 | if (ifa->ifa_prefixlen < 31) { | |
751 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix, 32, prim); | |
6a31d2a9 ED |
752 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix | ~mask, |
753 | 32, prim); | |
1da177e4 LT |
754 | } |
755 | } | |
756 | } | |
757 | ||
e6abbaa2 JA |
758 | /* Delete primary or secondary address. |
759 | * Optionally, on secondary address promotion consider the addresses | |
760 | * from subnet iprim as deleted, even if they are in device list. | |
761 | * In this case the secondary ifa can be in device list. | |
762 | */ | |
763 | void fib_del_ifaddr(struct in_ifaddr *ifa, struct in_ifaddr *iprim) | |
1da177e4 LT |
764 | { |
765 | struct in_device *in_dev = ifa->ifa_dev; | |
766 | struct net_device *dev = in_dev->dev; | |
767 | struct in_ifaddr *ifa1; | |
e6abbaa2 | 768 | struct in_ifaddr *prim = ifa, *prim1 = NULL; |
6a31d2a9 ED |
769 | __be32 brd = ifa->ifa_address | ~ifa->ifa_mask; |
770 | __be32 any = ifa->ifa_address & ifa->ifa_mask; | |
1da177e4 LT |
771 | #define LOCAL_OK 1 |
772 | #define BRD_OK 2 | |
773 | #define BRD0_OK 4 | |
774 | #define BRD1_OK 8 | |
95c96174 | 775 | unsigned int ok = 0; |
e6abbaa2 JA |
776 | int subnet = 0; /* Primary network */ |
777 | int gone = 1; /* Address is missing */ | |
778 | int same_prefsrc = 0; /* Another primary with same IP */ | |
1da177e4 | 779 | |
e6abbaa2 | 780 | if (ifa->ifa_flags & IFA_F_SECONDARY) { |
1da177e4 LT |
781 | prim = inet_ifa_byprefix(in_dev, any, ifa->ifa_mask); |
782 | if (prim == NULL) { | |
058bd4d2 | 783 | pr_warn("%s: bug: prim == NULL\n", __func__); |
1da177e4 LT |
784 | return; |
785 | } | |
e6abbaa2 | 786 | if (iprim && iprim != prim) { |
058bd4d2 | 787 | pr_warn("%s: bug: iprim != prim\n", __func__); |
e6abbaa2 JA |
788 | return; |
789 | } | |
790 | } else if (!ipv4_is_zeronet(any) && | |
791 | (any != ifa->ifa_local || ifa->ifa_prefixlen < 32)) { | |
792 | fib_magic(RTM_DELROUTE, | |
793 | dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST, | |
794 | any, ifa->ifa_prefixlen, prim); | |
795 | subnet = 1; | |
1da177e4 LT |
796 | } |
797 | ||
798 | /* Deletion is more complicated than add. | |
6a31d2a9 ED |
799 | * We should take care of not to delete too much :-) |
800 | * | |
801 | * Scan address list to be sure that addresses are really gone. | |
1da177e4 LT |
802 | */ |
803 | ||
804 | for (ifa1 = in_dev->ifa_list; ifa1; ifa1 = ifa1->ifa_next) { | |
e6abbaa2 JA |
805 | if (ifa1 == ifa) { |
806 | /* promotion, keep the IP */ | |
807 | gone = 0; | |
808 | continue; | |
809 | } | |
810 | /* Ignore IFAs from our subnet */ | |
811 | if (iprim && ifa1->ifa_mask == iprim->ifa_mask && | |
812 | inet_ifa_match(ifa1->ifa_address, iprim)) | |
813 | continue; | |
814 | ||
815 | /* Ignore ifa1 if it uses different primary IP (prefsrc) */ | |
816 | if (ifa1->ifa_flags & IFA_F_SECONDARY) { | |
817 | /* Another address from our subnet? */ | |
818 | if (ifa1->ifa_mask == prim->ifa_mask && | |
819 | inet_ifa_match(ifa1->ifa_address, prim)) | |
820 | prim1 = prim; | |
821 | else { | |
822 | /* We reached the secondaries, so | |
823 | * same_prefsrc should be determined. | |
824 | */ | |
825 | if (!same_prefsrc) | |
826 | continue; | |
827 | /* Search new prim1 if ifa1 is not | |
828 | * using the current prim1 | |
829 | */ | |
830 | if (!prim1 || | |
831 | ifa1->ifa_mask != prim1->ifa_mask || | |
832 | !inet_ifa_match(ifa1->ifa_address, prim1)) | |
833 | prim1 = inet_ifa_byprefix(in_dev, | |
834 | ifa1->ifa_address, | |
835 | ifa1->ifa_mask); | |
836 | if (!prim1) | |
837 | continue; | |
838 | if (prim1->ifa_local != prim->ifa_local) | |
839 | continue; | |
840 | } | |
841 | } else { | |
842 | if (prim->ifa_local != ifa1->ifa_local) | |
843 | continue; | |
844 | prim1 = ifa1; | |
845 | if (prim != prim1) | |
846 | same_prefsrc = 1; | |
847 | } | |
1da177e4 LT |
848 | if (ifa->ifa_local == ifa1->ifa_local) |
849 | ok |= LOCAL_OK; | |
850 | if (ifa->ifa_broadcast == ifa1->ifa_broadcast) | |
851 | ok |= BRD_OK; | |
852 | if (brd == ifa1->ifa_broadcast) | |
853 | ok |= BRD1_OK; | |
854 | if (any == ifa1->ifa_broadcast) | |
855 | ok |= BRD0_OK; | |
e6abbaa2 JA |
856 | /* primary has network specific broadcasts */ |
857 | if (prim1 == ifa1 && ifa1->ifa_prefixlen < 31) { | |
858 | __be32 brd1 = ifa1->ifa_address | ~ifa1->ifa_mask; | |
859 | __be32 any1 = ifa1->ifa_address & ifa1->ifa_mask; | |
860 | ||
861 | if (!ipv4_is_zeronet(any1)) { | |
862 | if (ifa->ifa_broadcast == brd1 || | |
863 | ifa->ifa_broadcast == any1) | |
864 | ok |= BRD_OK; | |
865 | if (brd == brd1 || brd == any1) | |
866 | ok |= BRD1_OK; | |
867 | if (any == brd1 || any == any1) | |
868 | ok |= BRD0_OK; | |
869 | } | |
870 | } | |
1da177e4 LT |
871 | } |
872 | ||
6a31d2a9 | 873 | if (!(ok & BRD_OK)) |
1da177e4 | 874 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim); |
e6abbaa2 JA |
875 | if (subnet && ifa->ifa_prefixlen < 31) { |
876 | if (!(ok & BRD1_OK)) | |
877 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, brd, 32, prim); | |
878 | if (!(ok & BRD0_OK)) | |
879 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, any, 32, prim); | |
880 | } | |
6a31d2a9 | 881 | if (!(ok & LOCAL_OK)) { |
1da177e4 LT |
882 | fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 32, prim); |
883 | ||
884 | /* Check, that this local address finally disappeared. */ | |
e6abbaa2 JA |
885 | if (gone && |
886 | inet_addr_type(dev_net(dev), ifa->ifa_local) != RTN_LOCAL) { | |
1da177e4 | 887 | /* And the last, but not the least thing. |
6a31d2a9 ED |
888 | * We must flush stray FIB entries. |
889 | * | |
890 | * First of all, we scan fib_info list searching | |
891 | * for stray nexthop entries, then ignite fib_flush. | |
892 | */ | |
c346dca1 YH |
893 | if (fib_sync_down_addr(dev_net(dev), ifa->ifa_local)) |
894 | fib_flush(dev_net(dev)); | |
1da177e4 LT |
895 | } |
896 | } | |
897 | #undef LOCAL_OK | |
898 | #undef BRD_OK | |
899 | #undef BRD0_OK | |
900 | #undef BRD1_OK | |
901 | } | |
902 | ||
6a31d2a9 | 903 | static void nl_fib_lookup(struct fib_result_nl *frn, struct fib_table *tb) |
246955fe | 904 | { |
e905a9ed | 905 | |
246955fe | 906 | struct fib_result res; |
9ade2286 DM |
907 | struct flowi4 fl4 = { |
908 | .flowi4_mark = frn->fl_mark, | |
909 | .daddr = frn->fl_addr, | |
910 | .flowi4_tos = frn->fl_tos, | |
911 | .flowi4_scope = frn->fl_scope, | |
6a31d2a9 | 912 | }; |
1194ed0a | 913 | |
912a41a4 SV |
914 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
915 | res.r = NULL; | |
916 | #endif | |
917 | ||
1194ed0a | 918 | frn->err = -ENOENT; |
246955fe RO |
919 | if (tb) { |
920 | local_bh_disable(); | |
921 | ||
922 | frn->tb_id = tb->tb_id; | |
ebc0ffae | 923 | rcu_read_lock(); |
9ade2286 | 924 | frn->err = fib_table_lookup(tb, &fl4, &res, FIB_LOOKUP_NOREF); |
246955fe RO |
925 | |
926 | if (!frn->err) { | |
927 | frn->prefixlen = res.prefixlen; | |
928 | frn->nh_sel = res.nh_sel; | |
929 | frn->type = res.type; | |
930 | frn->scope = res.scope; | |
931 | } | |
ebc0ffae | 932 | rcu_read_unlock(); |
246955fe RO |
933 | local_bh_enable(); |
934 | } | |
935 | } | |
936 | ||
28f7b036 | 937 | static void nl_fib_input(struct sk_buff *skb) |
246955fe | 938 | { |
6bd48fcf | 939 | struct net *net; |
246955fe | 940 | struct fib_result_nl *frn; |
28f7b036 | 941 | struct nlmsghdr *nlh; |
246955fe | 942 | struct fib_table *tb; |
28f7b036 | 943 | u32 pid; |
1194ed0a | 944 | |
3b1e0a65 | 945 | net = sock_net(skb->sk); |
b529ccf2 | 946 | nlh = nlmsg_hdr(skb); |
ea86575e | 947 | if (skb->len < NLMSG_SPACE(0) || skb->len < nlh->nlmsg_len || |
d883a036 | 948 | nlh->nlmsg_len < NLMSG_LENGTH(sizeof(*frn))) |
ea86575e | 949 | return; |
d883a036 DL |
950 | |
951 | skb = skb_clone(skb, GFP_KERNEL); | |
952 | if (skb == NULL) | |
953 | return; | |
954 | nlh = nlmsg_hdr(skb); | |
e905a9ed | 955 | |
246955fe | 956 | frn = (struct fib_result_nl *) NLMSG_DATA(nlh); |
6bd48fcf | 957 | tb = fib_get_table(net, frn->tb_id_in); |
246955fe RO |
958 | |
959 | nl_fib_lookup(frn, tb); | |
e905a9ed | 960 | |
6a31d2a9 ED |
961 | pid = NETLINK_CB(skb).pid; /* pid of sending process */ |
962 | NETLINK_CB(skb).pid = 0; /* from kernel */ | |
ac6d439d | 963 | NETLINK_CB(skb).dst_group = 0; /* unicast */ |
6bd48fcf | 964 | netlink_unicast(net->ipv4.fibnl, skb, pid, MSG_DONTWAIT); |
e905a9ed | 965 | } |
246955fe | 966 | |
2c8c1e72 | 967 | static int __net_init nl_fib_lookup_init(struct net *net) |
246955fe | 968 | { |
6bd48fcf DL |
969 | struct sock *sk; |
970 | sk = netlink_kernel_create(net, NETLINK_FIB_LOOKUP, 0, | |
971 | nl_fib_input, NULL, THIS_MODULE); | |
972 | if (sk == NULL) | |
7b1a74fd | 973 | return -EAFNOSUPPORT; |
6bd48fcf | 974 | net->ipv4.fibnl = sk; |
7b1a74fd DL |
975 | return 0; |
976 | } | |
977 | ||
978 | static void nl_fib_lookup_exit(struct net *net) | |
979 | { | |
b7c6ba6e | 980 | netlink_kernel_release(net->ipv4.fibnl); |
775516bf | 981 | net->ipv4.fibnl = NULL; |
246955fe RO |
982 | } |
983 | ||
e2ce1468 | 984 | static void fib_disable_ip(struct net_device *dev, int force, int delay) |
1da177e4 | 985 | { |
85326fa5 | 986 | if (fib_sync_down_dev(dev, force)) |
c346dca1 | 987 | fib_flush(dev_net(dev)); |
e2ce1468 | 988 | rt_cache_flush(dev_net(dev), delay); |
1da177e4 LT |
989 | arp_ifdown(dev); |
990 | } | |
991 | ||
992 | static int fib_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr) | |
993 | { | |
6ed2533e | 994 | struct in_ifaddr *ifa = (struct in_ifaddr *)ptr; |
76e6ebfb | 995 | struct net_device *dev = ifa->ifa_dev->dev; |
436c3b66 | 996 | struct net *net = dev_net(dev); |
1da177e4 LT |
997 | |
998 | switch (event) { | |
999 | case NETDEV_UP: | |
1000 | fib_add_ifaddr(ifa); | |
1001 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
76e6ebfb | 1002 | fib_sync_up(dev); |
1da177e4 | 1003 | #endif |
436c3b66 | 1004 | atomic_inc(&net->ipv4.dev_addr_genid); |
76e6ebfb | 1005 | rt_cache_flush(dev_net(dev), -1); |
1da177e4 LT |
1006 | break; |
1007 | case NETDEV_DOWN: | |
e6abbaa2 | 1008 | fib_del_ifaddr(ifa, NULL); |
436c3b66 | 1009 | atomic_inc(&net->ipv4.dev_addr_genid); |
9fcc2e8a | 1010 | if (ifa->ifa_dev->ifa_list == NULL) { |
1da177e4 | 1011 | /* Last address was deleted from this interface. |
6a31d2a9 | 1012 | * Disable IP. |
1da177e4 | 1013 | */ |
e2ce1468 | 1014 | fib_disable_ip(dev, 1, 0); |
1da177e4 | 1015 | } else { |
76e6ebfb | 1016 | rt_cache_flush(dev_net(dev), -1); |
1da177e4 LT |
1017 | } |
1018 | break; | |
1019 | } | |
1020 | return NOTIFY_DONE; | |
1021 | } | |
1022 | ||
1023 | static int fib_netdev_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1024 | { | |
1025 | struct net_device *dev = ptr; | |
e5ed6399 | 1026 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
436c3b66 | 1027 | struct net *net = dev_net(dev); |
1da177e4 LT |
1028 | |
1029 | if (event == NETDEV_UNREGISTER) { | |
e2ce1468 | 1030 | fib_disable_ip(dev, 2, -1); |
1da177e4 LT |
1031 | return NOTIFY_DONE; |
1032 | } | |
1033 | ||
1034 | if (!in_dev) | |
1035 | return NOTIFY_DONE; | |
1036 | ||
1037 | switch (event) { | |
1038 | case NETDEV_UP: | |
1039 | for_ifa(in_dev) { | |
1040 | fib_add_ifaddr(ifa); | |
1041 | } endfor_ifa(in_dev); | |
1042 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
1043 | fib_sync_up(dev); | |
1044 | #endif | |
436c3b66 | 1045 | atomic_inc(&net->ipv4.dev_addr_genid); |
76e6ebfb | 1046 | rt_cache_flush(dev_net(dev), -1); |
1da177e4 LT |
1047 | break; |
1048 | case NETDEV_DOWN: | |
e2ce1468 | 1049 | fib_disable_ip(dev, 0, 0); |
1da177e4 LT |
1050 | break; |
1051 | case NETDEV_CHANGEMTU: | |
1052 | case NETDEV_CHANGE: | |
76e6ebfb | 1053 | rt_cache_flush(dev_net(dev), 0); |
1da177e4 | 1054 | break; |
a5ee1551 | 1055 | case NETDEV_UNREGISTER_BATCH: |
6561a3b1 DM |
1056 | /* The batch unregister is only called on the first |
1057 | * device in the list of devices being unregistered. | |
1058 | * Therefore we should not pass dev_net(dev) in here. | |
1059 | */ | |
1060 | rt_cache_flush_batch(NULL); | |
a5ee1551 | 1061 | break; |
1da177e4 LT |
1062 | } |
1063 | return NOTIFY_DONE; | |
1064 | } | |
1065 | ||
1066 | static struct notifier_block fib_inetaddr_notifier = { | |
6ed2533e | 1067 | .notifier_call = fib_inetaddr_event, |
1da177e4 LT |
1068 | }; |
1069 | ||
1070 | static struct notifier_block fib_netdev_notifier = { | |
6ed2533e | 1071 | .notifier_call = fib_netdev_event, |
1da177e4 LT |
1072 | }; |
1073 | ||
7b1a74fd | 1074 | static int __net_init ip_fib_net_init(struct net *net) |
1da177e4 | 1075 | { |
dce5cbee | 1076 | int err; |
10da66f7 ED |
1077 | size_t size = sizeof(struct hlist_head) * FIB_TABLE_HASHSZ; |
1078 | ||
1079 | /* Avoid false sharing : Use at least a full cache line */ | |
1080 | size = max_t(size_t, size, L1_CACHE_BYTES); | |
1af5a8c4 | 1081 | |
10da66f7 | 1082 | net->ipv4.fib_table_hash = kzalloc(size, GFP_KERNEL); |
e4aef8ae DL |
1083 | if (net->ipv4.fib_table_hash == NULL) |
1084 | return -ENOMEM; | |
1085 | ||
dce5cbee DL |
1086 | err = fib4_rules_init(net); |
1087 | if (err < 0) | |
1088 | goto fail; | |
1089 | return 0; | |
1090 | ||
1091 | fail: | |
1092 | kfree(net->ipv4.fib_table_hash); | |
1093 | return err; | |
7b1a74fd | 1094 | } |
1da177e4 | 1095 | |
2c8c1e72 | 1096 | static void ip_fib_net_exit(struct net *net) |
7b1a74fd DL |
1097 | { |
1098 | unsigned int i; | |
1099 | ||
1100 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
1101 | fib4_rules_exit(net); | |
1102 | #endif | |
1103 | ||
e2666f84 | 1104 | rtnl_lock(); |
7b1a74fd DL |
1105 | for (i = 0; i < FIB_TABLE_HASHSZ; i++) { |
1106 | struct fib_table *tb; | |
1107 | struct hlist_head *head; | |
1108 | struct hlist_node *node, *tmp; | |
63f3444f | 1109 | |
e4aef8ae | 1110 | head = &net->ipv4.fib_table_hash[i]; |
7b1a74fd DL |
1111 | hlist_for_each_entry_safe(tb, node, tmp, head, tb_hlist) { |
1112 | hlist_del(node); | |
16c6cf8b | 1113 | fib_table_flush(tb); |
4aa2c466 | 1114 | fib_free_table(tb); |
7b1a74fd DL |
1115 | } |
1116 | } | |
e2666f84 | 1117 | rtnl_unlock(); |
e4aef8ae | 1118 | kfree(net->ipv4.fib_table_hash); |
7b1a74fd DL |
1119 | } |
1120 | ||
1121 | static int __net_init fib_net_init(struct net *net) | |
1122 | { | |
1123 | int error; | |
1124 | ||
7b1a74fd DL |
1125 | error = ip_fib_net_init(net); |
1126 | if (error < 0) | |
1127 | goto out; | |
1128 | error = nl_fib_lookup_init(net); | |
1129 | if (error < 0) | |
1130 | goto out_nlfl; | |
1131 | error = fib_proc_init(net); | |
1132 | if (error < 0) | |
1133 | goto out_proc; | |
1134 | out: | |
1135 | return error; | |
1136 | ||
1137 | out_proc: | |
1138 | nl_fib_lookup_exit(net); | |
1139 | out_nlfl: | |
1140 | ip_fib_net_exit(net); | |
1141 | goto out; | |
1142 | } | |
1143 | ||
1144 | static void __net_exit fib_net_exit(struct net *net) | |
1145 | { | |
1146 | fib_proc_exit(net); | |
1147 | nl_fib_lookup_exit(net); | |
1148 | ip_fib_net_exit(net); | |
1149 | } | |
1150 | ||
1151 | static struct pernet_operations fib_net_ops = { | |
1152 | .init = fib_net_init, | |
1153 | .exit = fib_net_exit, | |
1154 | }; | |
1155 | ||
1156 | void __init ip_fib_init(void) | |
1157 | { | |
c7ac8679 GR |
1158 | rtnl_register(PF_INET, RTM_NEWROUTE, inet_rtm_newroute, NULL, NULL); |
1159 | rtnl_register(PF_INET, RTM_DELROUTE, inet_rtm_delroute, NULL, NULL); | |
1160 | rtnl_register(PF_INET, RTM_GETROUTE, NULL, inet_dump_fib, NULL); | |
7b1a74fd DL |
1161 | |
1162 | register_pernet_subsys(&fib_net_ops); | |
1163 | register_netdevice_notifier(&fib_netdev_notifier); | |
1164 | register_inetaddr_notifier(&fib_inetaddr_notifier); | |
7f9b8052 | 1165 | |
5348ba85 | 1166 | fib_trie_init(); |
1da177e4 | 1167 | } |