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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * INET An implementation of the TCP/IP protocol suite for the LINUX | |
3 | * operating system. INET is implemented using the BSD Socket | |
4 | * interface as the means of communication with the user level. | |
5 | * | |
6 | * IPv4 Forwarding Information Base: FIB frontend. | |
7 | * | |
8 | * Version: $Id: fib_frontend.c,v 1.26 2001/10/31 21:55:54 davem Exp $ | |
9 | * | |
10 | * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> | |
11 | * | |
12 | * This program is free software; you can redistribute it and/or | |
13 | * modify it under the terms of the GNU General Public License | |
14 | * as published by the Free Software Foundation; either version | |
15 | * 2 of the License, or (at your option) any later version. | |
16 | */ | |
17 | ||
1da177e4 LT |
18 | #include <linux/module.h> |
19 | #include <asm/uaccess.h> | |
20 | #include <asm/system.h> | |
21 | #include <linux/bitops.h> | |
4fc268d2 | 22 | #include <linux/capability.h> |
1da177e4 LT |
23 | #include <linux/types.h> |
24 | #include <linux/kernel.h> | |
1da177e4 LT |
25 | #include <linux/mm.h> |
26 | #include <linux/string.h> | |
27 | #include <linux/socket.h> | |
28 | #include <linux/sockios.h> | |
29 | #include <linux/errno.h> | |
30 | #include <linux/in.h> | |
31 | #include <linux/inet.h> | |
14c85021 | 32 | #include <linux/inetdevice.h> |
1da177e4 | 33 | #include <linux/netdevice.h> |
1823730f | 34 | #include <linux/if_addr.h> |
1da177e4 LT |
35 | #include <linux/if_arp.h> |
36 | #include <linux/skbuff.h> | |
1da177e4 | 37 | #include <linux/init.h> |
1af5a8c4 | 38 | #include <linux/list.h> |
1da177e4 LT |
39 | |
40 | #include <net/ip.h> | |
41 | #include <net/protocol.h> | |
42 | #include <net/route.h> | |
43 | #include <net/tcp.h> | |
44 | #include <net/sock.h> | |
45 | #include <net/icmp.h> | |
46 | #include <net/arp.h> | |
47 | #include <net/ip_fib.h> | |
63f3444f | 48 | #include <net/rtnetlink.h> |
1da177e4 LT |
49 | |
50 | #define FFprint(a...) printk(KERN_DEBUG a) | |
51 | ||
28f7b036 DM |
52 | static struct sock *fibnl; |
53 | ||
1da177e4 LT |
54 | #ifndef CONFIG_IP_MULTIPLE_TABLES |
55 | ||
1da177e4 LT |
56 | struct fib_table *ip_fib_local_table; |
57 | struct fib_table *ip_fib_main_table; | |
58 | ||
1af5a8c4 PM |
59 | #define FIB_TABLE_HASHSZ 1 |
60 | static struct hlist_head fib_table_hash[FIB_TABLE_HASHSZ]; | |
1da177e4 | 61 | |
dbb50165 | 62 | static int __init fib4_rules_init(void) |
c3e9a353 PE |
63 | { |
64 | ip_fib_local_table = fib_hash_init(RT_TABLE_LOCAL); | |
dbb50165 DL |
65 | if (ip_fib_local_table == NULL) |
66 | return -ENOMEM; | |
67 | ||
c3e9a353 | 68 | ip_fib_main_table = fib_hash_init(RT_TABLE_MAIN); |
dbb50165 DL |
69 | if (ip_fib_main_table == NULL) |
70 | goto fail; | |
71 | ||
72 | hlist_add_head_rcu(&ip_fib_local_table->tb_hlist, &fib_table_hash[0]); | |
c3e9a353 | 73 | hlist_add_head_rcu(&ip_fib_main_table->tb_hlist, &fib_table_hash[0]); |
dbb50165 DL |
74 | return 0; |
75 | ||
76 | fail: | |
77 | kfree(ip_fib_local_table); | |
78 | ip_fib_local_table = NULL; | |
79 | return -ENOMEM; | |
c3e9a353 | 80 | } |
1af5a8c4 | 81 | #else |
1da177e4 | 82 | |
1af5a8c4 PM |
83 | #define FIB_TABLE_HASHSZ 256 |
84 | static struct hlist_head fib_table_hash[FIB_TABLE_HASHSZ]; | |
1da177e4 | 85 | |
1af5a8c4 | 86 | struct fib_table *fib_new_table(u32 id) |
1da177e4 LT |
87 | { |
88 | struct fib_table *tb; | |
1af5a8c4 | 89 | unsigned int h; |
1da177e4 | 90 | |
1af5a8c4 PM |
91 | if (id == 0) |
92 | id = RT_TABLE_MAIN; | |
93 | tb = fib_get_table(id); | |
94 | if (tb) | |
95 | return tb; | |
1da177e4 LT |
96 | tb = fib_hash_init(id); |
97 | if (!tb) | |
98 | return NULL; | |
1af5a8c4 PM |
99 | h = id & (FIB_TABLE_HASHSZ - 1); |
100 | hlist_add_head_rcu(&tb->tb_hlist, &fib_table_hash[h]); | |
1da177e4 LT |
101 | return tb; |
102 | } | |
103 | ||
1af5a8c4 PM |
104 | struct fib_table *fib_get_table(u32 id) |
105 | { | |
106 | struct fib_table *tb; | |
107 | struct hlist_node *node; | |
108 | unsigned int h; | |
1da177e4 | 109 | |
1af5a8c4 PM |
110 | if (id == 0) |
111 | id = RT_TABLE_MAIN; | |
112 | h = id & (FIB_TABLE_HASHSZ - 1); | |
113 | rcu_read_lock(); | |
114 | hlist_for_each_entry_rcu(tb, node, &fib_table_hash[h], tb_hlist) { | |
115 | if (tb->tb_id == id) { | |
116 | rcu_read_unlock(); | |
117 | return tb; | |
118 | } | |
119 | } | |
120 | rcu_read_unlock(); | |
121 | return NULL; | |
122 | } | |
1da177e4 LT |
123 | #endif /* CONFIG_IP_MULTIPLE_TABLES */ |
124 | ||
1da177e4 LT |
125 | static void fib_flush(void) |
126 | { | |
127 | int flushed = 0; | |
1da177e4 | 128 | struct fib_table *tb; |
1af5a8c4 PM |
129 | struct hlist_node *node; |
130 | unsigned int h; | |
1da177e4 | 131 | |
1af5a8c4 PM |
132 | for (h = 0; h < FIB_TABLE_HASHSZ; h++) { |
133 | hlist_for_each_entry(tb, node, &fib_table_hash[h], tb_hlist) | |
134 | flushed += tb->tb_flush(tb); | |
1da177e4 | 135 | } |
1da177e4 LT |
136 | |
137 | if (flushed) | |
138 | rt_cache_flush(-1); | |
139 | } | |
140 | ||
141 | /* | |
142 | * Find the first device with a given source address. | |
143 | */ | |
144 | ||
60cad5da | 145 | struct net_device * ip_dev_find(__be32 addr) |
1da177e4 LT |
146 | { |
147 | struct flowi fl = { .nl_u = { .ip4_u = { .daddr = addr } } }; | |
148 | struct fib_result res; | |
149 | struct net_device *dev = NULL; | |
03cf786c | 150 | struct fib_table *local_table; |
1da177e4 LT |
151 | |
152 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
153 | res.r = NULL; | |
154 | #endif | |
155 | ||
03cf786c PE |
156 | local_table = fib_get_table(RT_TABLE_LOCAL); |
157 | if (!local_table || local_table->tb_lookup(local_table, &fl, &res)) | |
1da177e4 LT |
158 | return NULL; |
159 | if (res.type != RTN_LOCAL) | |
160 | goto out; | |
161 | dev = FIB_RES_DEV(res); | |
162 | ||
163 | if (dev) | |
164 | dev_hold(dev); | |
165 | out: | |
166 | fib_res_put(&res); | |
167 | return dev; | |
168 | } | |
169 | ||
05538116 LAT |
170 | /* |
171 | * Find address type as if only "dev" was present in the system. If | |
172 | * on_dev is NULL then all interfaces are taken into consideration. | |
173 | */ | |
174 | static inline unsigned __inet_dev_addr_type(const struct net_device *dev, | |
175 | __be32 addr) | |
1da177e4 LT |
176 | { |
177 | struct flowi fl = { .nl_u = { .ip4_u = { .daddr = addr } } }; | |
178 | struct fib_result res; | |
179 | unsigned ret = RTN_BROADCAST; | |
03cf786c | 180 | struct fib_table *local_table; |
1da177e4 | 181 | |
f97c1e0c | 182 | if (ipv4_is_zeronet(addr) || ipv4_is_badclass(addr)) |
1da177e4 | 183 | return RTN_BROADCAST; |
f97c1e0c | 184 | if (ipv4_is_multicast(addr)) |
1da177e4 LT |
185 | return RTN_MULTICAST; |
186 | ||
187 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
188 | res.r = NULL; | |
189 | #endif | |
e905a9ed | 190 | |
03cf786c PE |
191 | local_table = fib_get_table(RT_TABLE_LOCAL); |
192 | if (local_table) { | |
1da177e4 | 193 | ret = RTN_UNICAST; |
03cf786c | 194 | if (!local_table->tb_lookup(local_table, &fl, &res)) { |
05538116 LAT |
195 | if (!dev || dev == res.fi->fib_dev) |
196 | ret = res.type; | |
1da177e4 LT |
197 | fib_res_put(&res); |
198 | } | |
199 | } | |
200 | return ret; | |
201 | } | |
202 | ||
05538116 LAT |
203 | unsigned int inet_addr_type(__be32 addr) |
204 | { | |
205 | return __inet_dev_addr_type(NULL, addr); | |
206 | } | |
207 | ||
208 | unsigned int inet_dev_addr_type(const struct net_device *dev, __be32 addr) | |
209 | { | |
210 | return __inet_dev_addr_type(dev, addr); | |
211 | } | |
212 | ||
1da177e4 LT |
213 | /* Given (packet source, input interface) and optional (dst, oif, tos): |
214 | - (main) check, that source is valid i.e. not broadcast or our local | |
215 | address. | |
216 | - figure out what "logical" interface this packet arrived | |
217 | and calculate "specific destination" address. | |
218 | - check, that packet arrived from expected physical interface. | |
219 | */ | |
220 | ||
d9c9df8c AV |
221 | int fib_validate_source(__be32 src, __be32 dst, u8 tos, int oif, |
222 | struct net_device *dev, __be32 *spec_dst, u32 *itag) | |
1da177e4 LT |
223 | { |
224 | struct in_device *in_dev; | |
225 | struct flowi fl = { .nl_u = { .ip4_u = | |
226 | { .daddr = src, | |
227 | .saddr = dst, | |
228 | .tos = tos } }, | |
229 | .iif = oif }; | |
230 | struct fib_result res; | |
231 | int no_addr, rpf; | |
232 | int ret; | |
233 | ||
234 | no_addr = rpf = 0; | |
235 | rcu_read_lock(); | |
e5ed6399 | 236 | in_dev = __in_dev_get_rcu(dev); |
1da177e4 LT |
237 | if (in_dev) { |
238 | no_addr = in_dev->ifa_list == NULL; | |
239 | rpf = IN_DEV_RPFILTER(in_dev); | |
240 | } | |
241 | rcu_read_unlock(); | |
242 | ||
243 | if (in_dev == NULL) | |
244 | goto e_inval; | |
245 | ||
246 | if (fib_lookup(&fl, &res)) | |
247 | goto last_resort; | |
248 | if (res.type != RTN_UNICAST) | |
249 | goto e_inval_res; | |
250 | *spec_dst = FIB_RES_PREFSRC(res); | |
251 | fib_combine_itag(itag, &res); | |
252 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
253 | if (FIB_RES_DEV(res) == dev || res.fi->fib_nhs > 1) | |
254 | #else | |
255 | if (FIB_RES_DEV(res) == dev) | |
256 | #endif | |
257 | { | |
258 | ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST; | |
259 | fib_res_put(&res); | |
260 | return ret; | |
261 | } | |
262 | fib_res_put(&res); | |
263 | if (no_addr) | |
264 | goto last_resort; | |
265 | if (rpf) | |
266 | goto e_inval; | |
267 | fl.oif = dev->ifindex; | |
268 | ||
269 | ret = 0; | |
270 | if (fib_lookup(&fl, &res) == 0) { | |
271 | if (res.type == RTN_UNICAST) { | |
272 | *spec_dst = FIB_RES_PREFSRC(res); | |
273 | ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST; | |
274 | } | |
275 | fib_res_put(&res); | |
276 | } | |
277 | return ret; | |
278 | ||
279 | last_resort: | |
280 | if (rpf) | |
281 | goto e_inval; | |
282 | *spec_dst = inet_select_addr(dev, 0, RT_SCOPE_UNIVERSE); | |
283 | *itag = 0; | |
284 | return 0; | |
285 | ||
286 | e_inval_res: | |
287 | fib_res_put(&res); | |
288 | e_inval: | |
289 | return -EINVAL; | |
290 | } | |
291 | ||
81f7bf6c | 292 | static inline __be32 sk_extract_addr(struct sockaddr *addr) |
4e902c57 TG |
293 | { |
294 | return ((struct sockaddr_in *) addr)->sin_addr.s_addr; | |
295 | } | |
296 | ||
297 | static int put_rtax(struct nlattr *mx, int len, int type, u32 value) | |
298 | { | |
299 | struct nlattr *nla; | |
300 | ||
301 | nla = (struct nlattr *) ((char *) mx + len); | |
302 | nla->nla_type = type; | |
303 | nla->nla_len = nla_attr_size(4); | |
304 | *(u32 *) nla_data(nla) = value; | |
305 | ||
306 | return len + nla_total_size(4); | |
307 | } | |
308 | ||
309 | static int rtentry_to_fib_config(int cmd, struct rtentry *rt, | |
310 | struct fib_config *cfg) | |
311 | { | |
6d85c10a | 312 | __be32 addr; |
4e902c57 TG |
313 | int plen; |
314 | ||
315 | memset(cfg, 0, sizeof(*cfg)); | |
316 | ||
317 | if (rt->rt_dst.sa_family != AF_INET) | |
318 | return -EAFNOSUPPORT; | |
319 | ||
320 | /* | |
321 | * Check mask for validity: | |
322 | * a) it must be contiguous. | |
323 | * b) destination must have all host bits clear. | |
324 | * c) if application forgot to set correct family (AF_INET), | |
325 | * reject request unless it is absolutely clear i.e. | |
326 | * both family and mask are zero. | |
327 | */ | |
328 | plen = 32; | |
329 | addr = sk_extract_addr(&rt->rt_dst); | |
330 | if (!(rt->rt_flags & RTF_HOST)) { | |
81f7bf6c | 331 | __be32 mask = sk_extract_addr(&rt->rt_genmask); |
4e902c57 TG |
332 | |
333 | if (rt->rt_genmask.sa_family != AF_INET) { | |
334 | if (mask || rt->rt_genmask.sa_family) | |
335 | return -EAFNOSUPPORT; | |
336 | } | |
337 | ||
338 | if (bad_mask(mask, addr)) | |
339 | return -EINVAL; | |
340 | ||
341 | plen = inet_mask_len(mask); | |
342 | } | |
343 | ||
344 | cfg->fc_dst_len = plen; | |
345 | cfg->fc_dst = addr; | |
346 | ||
347 | if (cmd != SIOCDELRT) { | |
348 | cfg->fc_nlflags = NLM_F_CREATE; | |
349 | cfg->fc_protocol = RTPROT_BOOT; | |
350 | } | |
351 | ||
352 | if (rt->rt_metric) | |
353 | cfg->fc_priority = rt->rt_metric - 1; | |
354 | ||
355 | if (rt->rt_flags & RTF_REJECT) { | |
356 | cfg->fc_scope = RT_SCOPE_HOST; | |
357 | cfg->fc_type = RTN_UNREACHABLE; | |
358 | return 0; | |
359 | } | |
360 | ||
361 | cfg->fc_scope = RT_SCOPE_NOWHERE; | |
362 | cfg->fc_type = RTN_UNICAST; | |
363 | ||
364 | if (rt->rt_dev) { | |
365 | char *colon; | |
366 | struct net_device *dev; | |
367 | char devname[IFNAMSIZ]; | |
368 | ||
369 | if (copy_from_user(devname, rt->rt_dev, IFNAMSIZ-1)) | |
370 | return -EFAULT; | |
371 | ||
372 | devname[IFNAMSIZ-1] = 0; | |
373 | colon = strchr(devname, ':'); | |
374 | if (colon) | |
375 | *colon = 0; | |
881d966b | 376 | dev = __dev_get_by_name(&init_net, devname); |
4e902c57 TG |
377 | if (!dev) |
378 | return -ENODEV; | |
379 | cfg->fc_oif = dev->ifindex; | |
380 | if (colon) { | |
381 | struct in_ifaddr *ifa; | |
382 | struct in_device *in_dev = __in_dev_get_rtnl(dev); | |
383 | if (!in_dev) | |
384 | return -ENODEV; | |
385 | *colon = ':'; | |
386 | for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) | |
387 | if (strcmp(ifa->ifa_label, devname) == 0) | |
388 | break; | |
389 | if (ifa == NULL) | |
390 | return -ENODEV; | |
391 | cfg->fc_prefsrc = ifa->ifa_local; | |
392 | } | |
393 | } | |
394 | ||
395 | addr = sk_extract_addr(&rt->rt_gateway); | |
396 | if (rt->rt_gateway.sa_family == AF_INET && addr) { | |
397 | cfg->fc_gw = addr; | |
398 | if (rt->rt_flags & RTF_GATEWAY && | |
399 | inet_addr_type(addr) == RTN_UNICAST) | |
400 | cfg->fc_scope = RT_SCOPE_UNIVERSE; | |
401 | } | |
402 | ||
403 | if (cmd == SIOCDELRT) | |
404 | return 0; | |
405 | ||
406 | if (rt->rt_flags & RTF_GATEWAY && !cfg->fc_gw) | |
407 | return -EINVAL; | |
408 | ||
409 | if (cfg->fc_scope == RT_SCOPE_NOWHERE) | |
410 | cfg->fc_scope = RT_SCOPE_LINK; | |
411 | ||
412 | if (rt->rt_flags & (RTF_MTU | RTF_WINDOW | RTF_IRTT)) { | |
413 | struct nlattr *mx; | |
414 | int len = 0; | |
415 | ||
416 | mx = kzalloc(3 * nla_total_size(4), GFP_KERNEL); | |
e905a9ed | 417 | if (mx == NULL) |
4e902c57 TG |
418 | return -ENOMEM; |
419 | ||
420 | if (rt->rt_flags & RTF_MTU) | |
421 | len = put_rtax(mx, len, RTAX_ADVMSS, rt->rt_mtu - 40); | |
422 | ||
423 | if (rt->rt_flags & RTF_WINDOW) | |
424 | len = put_rtax(mx, len, RTAX_WINDOW, rt->rt_window); | |
425 | ||
426 | if (rt->rt_flags & RTF_IRTT) | |
427 | len = put_rtax(mx, len, RTAX_RTT, rt->rt_irtt << 3); | |
428 | ||
429 | cfg->fc_mx = mx; | |
430 | cfg->fc_mx_len = len; | |
431 | } | |
432 | ||
433 | return 0; | |
434 | } | |
435 | ||
1da177e4 LT |
436 | /* |
437 | * Handle IP routing ioctl calls. These are used to manipulate the routing tables | |
438 | */ | |
e905a9ed | 439 | |
1da177e4 LT |
440 | int ip_rt_ioctl(unsigned int cmd, void __user *arg) |
441 | { | |
4e902c57 TG |
442 | struct fib_config cfg; |
443 | struct rtentry rt; | |
1da177e4 | 444 | int err; |
1da177e4 LT |
445 | |
446 | switch (cmd) { | |
447 | case SIOCADDRT: /* Add a route */ | |
448 | case SIOCDELRT: /* Delete a route */ | |
449 | if (!capable(CAP_NET_ADMIN)) | |
450 | return -EPERM; | |
4e902c57 TG |
451 | |
452 | if (copy_from_user(&rt, arg, sizeof(rt))) | |
1da177e4 | 453 | return -EFAULT; |
4e902c57 | 454 | |
1da177e4 | 455 | rtnl_lock(); |
4e902c57 | 456 | err = rtentry_to_fib_config(cmd, &rt, &cfg); |
1da177e4 | 457 | if (err == 0) { |
4e902c57 TG |
458 | struct fib_table *tb; |
459 | ||
1da177e4 | 460 | if (cmd == SIOCDELRT) { |
4e902c57 | 461 | tb = fib_get_table(cfg.fc_table); |
1da177e4 | 462 | if (tb) |
4e902c57 TG |
463 | err = tb->tb_delete(tb, &cfg); |
464 | else | |
465 | err = -ESRCH; | |
1da177e4 | 466 | } else { |
4e902c57 | 467 | tb = fib_new_table(cfg.fc_table); |
1da177e4 | 468 | if (tb) |
4e902c57 TG |
469 | err = tb->tb_insert(tb, &cfg); |
470 | else | |
471 | err = -ENOBUFS; | |
1da177e4 | 472 | } |
4e902c57 TG |
473 | |
474 | /* allocated by rtentry_to_fib_config() */ | |
475 | kfree(cfg.fc_mx); | |
1da177e4 LT |
476 | } |
477 | rtnl_unlock(); | |
478 | return err; | |
479 | } | |
480 | return -EINVAL; | |
481 | } | |
482 | ||
ef7c79ed | 483 | const struct nla_policy rtm_ipv4_policy[RTA_MAX+1] = { |
4e902c57 TG |
484 | [RTA_DST] = { .type = NLA_U32 }, |
485 | [RTA_SRC] = { .type = NLA_U32 }, | |
486 | [RTA_IIF] = { .type = NLA_U32 }, | |
487 | [RTA_OIF] = { .type = NLA_U32 }, | |
488 | [RTA_GATEWAY] = { .type = NLA_U32 }, | |
489 | [RTA_PRIORITY] = { .type = NLA_U32 }, | |
490 | [RTA_PREFSRC] = { .type = NLA_U32 }, | |
491 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
5176f91e | 492 | [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) }, |
4e902c57 TG |
493 | [RTA_PROTOINFO] = { .type = NLA_U32 }, |
494 | [RTA_FLOW] = { .type = NLA_U32 }, | |
4e902c57 TG |
495 | }; |
496 | ||
497 | static int rtm_to_fib_config(struct sk_buff *skb, struct nlmsghdr *nlh, | |
498 | struct fib_config *cfg) | |
1da177e4 | 499 | { |
4e902c57 TG |
500 | struct nlattr *attr; |
501 | int err, remaining; | |
502 | struct rtmsg *rtm; | |
503 | ||
504 | err = nlmsg_validate(nlh, sizeof(*rtm), RTA_MAX, rtm_ipv4_policy); | |
505 | if (err < 0) | |
506 | goto errout; | |
507 | ||
508 | memset(cfg, 0, sizeof(*cfg)); | |
509 | ||
510 | rtm = nlmsg_data(nlh); | |
4e902c57 | 511 | cfg->fc_dst_len = rtm->rtm_dst_len; |
4e902c57 TG |
512 | cfg->fc_tos = rtm->rtm_tos; |
513 | cfg->fc_table = rtm->rtm_table; | |
514 | cfg->fc_protocol = rtm->rtm_protocol; | |
515 | cfg->fc_scope = rtm->rtm_scope; | |
516 | cfg->fc_type = rtm->rtm_type; | |
517 | cfg->fc_flags = rtm->rtm_flags; | |
518 | cfg->fc_nlflags = nlh->nlmsg_flags; | |
519 | ||
520 | cfg->fc_nlinfo.pid = NETLINK_CB(skb).pid; | |
521 | cfg->fc_nlinfo.nlh = nlh; | |
522 | ||
a0ee18b9 TG |
523 | if (cfg->fc_type > RTN_MAX) { |
524 | err = -EINVAL; | |
525 | goto errout; | |
526 | } | |
527 | ||
4e902c57 | 528 | nlmsg_for_each_attr(attr, nlh, sizeof(struct rtmsg), remaining) { |
8f4c1f9b | 529 | switch (nla_type(attr)) { |
4e902c57 | 530 | case RTA_DST: |
17fb2c64 | 531 | cfg->fc_dst = nla_get_be32(attr); |
4e902c57 | 532 | break; |
4e902c57 TG |
533 | case RTA_OIF: |
534 | cfg->fc_oif = nla_get_u32(attr); | |
535 | break; | |
536 | case RTA_GATEWAY: | |
17fb2c64 | 537 | cfg->fc_gw = nla_get_be32(attr); |
4e902c57 TG |
538 | break; |
539 | case RTA_PRIORITY: | |
540 | cfg->fc_priority = nla_get_u32(attr); | |
541 | break; | |
542 | case RTA_PREFSRC: | |
17fb2c64 | 543 | cfg->fc_prefsrc = nla_get_be32(attr); |
4e902c57 TG |
544 | break; |
545 | case RTA_METRICS: | |
546 | cfg->fc_mx = nla_data(attr); | |
547 | cfg->fc_mx_len = nla_len(attr); | |
548 | break; | |
549 | case RTA_MULTIPATH: | |
550 | cfg->fc_mp = nla_data(attr); | |
551 | cfg->fc_mp_len = nla_len(attr); | |
552 | break; | |
553 | case RTA_FLOW: | |
554 | cfg->fc_flow = nla_get_u32(attr); | |
555 | break; | |
4e902c57 TG |
556 | case RTA_TABLE: |
557 | cfg->fc_table = nla_get_u32(attr); | |
558 | break; | |
1da177e4 LT |
559 | } |
560 | } | |
4e902c57 | 561 | |
1da177e4 | 562 | return 0; |
4e902c57 TG |
563 | errout: |
564 | return err; | |
1da177e4 LT |
565 | } |
566 | ||
63f3444f | 567 | static int inet_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 568 | { |
b854272b | 569 | struct net *net = skb->sk->sk_net; |
4e902c57 TG |
570 | struct fib_config cfg; |
571 | struct fib_table *tb; | |
572 | int err; | |
1da177e4 | 573 | |
b854272b DL |
574 | if (net != &init_net) |
575 | return -EINVAL; | |
576 | ||
4e902c57 TG |
577 | err = rtm_to_fib_config(skb, nlh, &cfg); |
578 | if (err < 0) | |
579 | goto errout; | |
1da177e4 | 580 | |
4e902c57 TG |
581 | tb = fib_get_table(cfg.fc_table); |
582 | if (tb == NULL) { | |
583 | err = -ESRCH; | |
584 | goto errout; | |
585 | } | |
586 | ||
587 | err = tb->tb_delete(tb, &cfg); | |
588 | errout: | |
589 | return err; | |
1da177e4 LT |
590 | } |
591 | ||
63f3444f | 592 | static int inet_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 593 | { |
b854272b | 594 | struct net *net = skb->sk->sk_net; |
4e902c57 TG |
595 | struct fib_config cfg; |
596 | struct fib_table *tb; | |
597 | int err; | |
1da177e4 | 598 | |
b854272b DL |
599 | if (net != &init_net) |
600 | return -EINVAL; | |
601 | ||
4e902c57 TG |
602 | err = rtm_to_fib_config(skb, nlh, &cfg); |
603 | if (err < 0) | |
604 | goto errout; | |
1da177e4 | 605 | |
4e902c57 TG |
606 | tb = fib_new_table(cfg.fc_table); |
607 | if (tb == NULL) { | |
608 | err = -ENOBUFS; | |
609 | goto errout; | |
610 | } | |
611 | ||
612 | err = tb->tb_insert(tb, &cfg); | |
613 | errout: | |
614 | return err; | |
1da177e4 LT |
615 | } |
616 | ||
63f3444f | 617 | static int inet_dump_fib(struct sk_buff *skb, struct netlink_callback *cb) |
1da177e4 | 618 | { |
b854272b | 619 | struct net *net = skb->sk->sk_net; |
1af5a8c4 PM |
620 | unsigned int h, s_h; |
621 | unsigned int e = 0, s_e; | |
1da177e4 | 622 | struct fib_table *tb; |
1af5a8c4 PM |
623 | struct hlist_node *node; |
624 | int dumped = 0; | |
1da177e4 | 625 | |
b854272b DL |
626 | if (net != &init_net) |
627 | return 0; | |
628 | ||
be403ea1 TG |
629 | if (nlmsg_len(cb->nlh) >= sizeof(struct rtmsg) && |
630 | ((struct rtmsg *) nlmsg_data(cb->nlh))->rtm_flags & RTM_F_CLONED) | |
1da177e4 LT |
631 | return ip_rt_dump(skb, cb); |
632 | ||
1af5a8c4 PM |
633 | s_h = cb->args[0]; |
634 | s_e = cb->args[1]; | |
635 | ||
636 | for (h = s_h; h < FIB_TABLE_HASHSZ; h++, s_e = 0) { | |
637 | e = 0; | |
638 | hlist_for_each_entry(tb, node, &fib_table_hash[h], tb_hlist) { | |
639 | if (e < s_e) | |
640 | goto next; | |
641 | if (dumped) | |
642 | memset(&cb->args[2], 0, sizeof(cb->args) - | |
e905a9ed | 643 | 2 * sizeof(cb->args[0])); |
1af5a8c4 PM |
644 | if (tb->tb_dump(tb, skb, cb) < 0) |
645 | goto out; | |
646 | dumped = 1; | |
647 | next: | |
648 | e++; | |
649 | } | |
1da177e4 | 650 | } |
1af5a8c4 PM |
651 | out: |
652 | cb->args[1] = e; | |
653 | cb->args[0] = h; | |
1da177e4 LT |
654 | |
655 | return skb->len; | |
656 | } | |
657 | ||
658 | /* Prepare and feed intra-kernel routing request. | |
659 | Really, it should be netlink message, but :-( netlink | |
660 | can be not configured, so that we feed it directly | |
661 | to fib engine. It is legal, because all events occur | |
662 | only when netlink is already locked. | |
663 | */ | |
664 | ||
81f7bf6c | 665 | static void fib_magic(int cmd, int type, __be32 dst, int dst_len, struct in_ifaddr *ifa) |
1da177e4 | 666 | { |
4e902c57 TG |
667 | struct fib_table *tb; |
668 | struct fib_config cfg = { | |
669 | .fc_protocol = RTPROT_KERNEL, | |
670 | .fc_type = type, | |
671 | .fc_dst = dst, | |
672 | .fc_dst_len = dst_len, | |
673 | .fc_prefsrc = ifa->ifa_local, | |
674 | .fc_oif = ifa->ifa_dev->dev->ifindex, | |
675 | .fc_nlflags = NLM_F_CREATE | NLM_F_APPEND, | |
676 | }; | |
1da177e4 LT |
677 | |
678 | if (type == RTN_UNICAST) | |
679 | tb = fib_new_table(RT_TABLE_MAIN); | |
680 | else | |
681 | tb = fib_new_table(RT_TABLE_LOCAL); | |
682 | ||
683 | if (tb == NULL) | |
684 | return; | |
685 | ||
4e902c57 | 686 | cfg.fc_table = tb->tb_id; |
1da177e4 | 687 | |
4e902c57 TG |
688 | if (type != RTN_LOCAL) |
689 | cfg.fc_scope = RT_SCOPE_LINK; | |
690 | else | |
691 | cfg.fc_scope = RT_SCOPE_HOST; | |
1da177e4 LT |
692 | |
693 | if (cmd == RTM_NEWROUTE) | |
4e902c57 | 694 | tb->tb_insert(tb, &cfg); |
1da177e4 | 695 | else |
4e902c57 | 696 | tb->tb_delete(tb, &cfg); |
1da177e4 LT |
697 | } |
698 | ||
0ff60a45 | 699 | void fib_add_ifaddr(struct in_ifaddr *ifa) |
1da177e4 LT |
700 | { |
701 | struct in_device *in_dev = ifa->ifa_dev; | |
702 | struct net_device *dev = in_dev->dev; | |
703 | struct in_ifaddr *prim = ifa; | |
a144ea4b AV |
704 | __be32 mask = ifa->ifa_mask; |
705 | __be32 addr = ifa->ifa_local; | |
706 | __be32 prefix = ifa->ifa_address&mask; | |
1da177e4 LT |
707 | |
708 | if (ifa->ifa_flags&IFA_F_SECONDARY) { | |
709 | prim = inet_ifa_byprefix(in_dev, prefix, mask); | |
710 | if (prim == NULL) { | |
711 | printk(KERN_DEBUG "fib_add_ifaddr: bug: prim == NULL\n"); | |
712 | return; | |
713 | } | |
714 | } | |
715 | ||
716 | fib_magic(RTM_NEWROUTE, RTN_LOCAL, addr, 32, prim); | |
717 | ||
718 | if (!(dev->flags&IFF_UP)) | |
719 | return; | |
720 | ||
721 | /* Add broadcast address, if it is explicitly assigned. */ | |
a144ea4b | 722 | if (ifa->ifa_broadcast && ifa->ifa_broadcast != htonl(0xFFFFFFFF)) |
1da177e4 LT |
723 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim); |
724 | ||
f97c1e0c | 725 | if (!ipv4_is_zeronet(prefix) && !(ifa->ifa_flags&IFA_F_SECONDARY) && |
1da177e4 LT |
726 | (prefix != addr || ifa->ifa_prefixlen < 32)) { |
727 | fib_magic(RTM_NEWROUTE, dev->flags&IFF_LOOPBACK ? RTN_LOCAL : | |
728 | RTN_UNICAST, prefix, ifa->ifa_prefixlen, prim); | |
729 | ||
730 | /* Add network specific broadcasts, when it takes a sense */ | |
731 | if (ifa->ifa_prefixlen < 31) { | |
732 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix, 32, prim); | |
733 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix|~mask, 32, prim); | |
734 | } | |
735 | } | |
736 | } | |
737 | ||
738 | static void fib_del_ifaddr(struct in_ifaddr *ifa) | |
739 | { | |
740 | struct in_device *in_dev = ifa->ifa_dev; | |
741 | struct net_device *dev = in_dev->dev; | |
742 | struct in_ifaddr *ifa1; | |
743 | struct in_ifaddr *prim = ifa; | |
a144ea4b AV |
744 | __be32 brd = ifa->ifa_address|~ifa->ifa_mask; |
745 | __be32 any = ifa->ifa_address&ifa->ifa_mask; | |
1da177e4 LT |
746 | #define LOCAL_OK 1 |
747 | #define BRD_OK 2 | |
748 | #define BRD0_OK 4 | |
749 | #define BRD1_OK 8 | |
750 | unsigned ok = 0; | |
751 | ||
752 | if (!(ifa->ifa_flags&IFA_F_SECONDARY)) | |
753 | fib_magic(RTM_DELROUTE, dev->flags&IFF_LOOPBACK ? RTN_LOCAL : | |
754 | RTN_UNICAST, any, ifa->ifa_prefixlen, prim); | |
755 | else { | |
756 | prim = inet_ifa_byprefix(in_dev, any, ifa->ifa_mask); | |
757 | if (prim == NULL) { | |
758 | printk(KERN_DEBUG "fib_del_ifaddr: bug: prim == NULL\n"); | |
759 | return; | |
760 | } | |
761 | } | |
762 | ||
763 | /* Deletion is more complicated than add. | |
764 | We should take care of not to delete too much :-) | |
765 | ||
766 | Scan address list to be sure that addresses are really gone. | |
767 | */ | |
768 | ||
769 | for (ifa1 = in_dev->ifa_list; ifa1; ifa1 = ifa1->ifa_next) { | |
770 | if (ifa->ifa_local == ifa1->ifa_local) | |
771 | ok |= LOCAL_OK; | |
772 | if (ifa->ifa_broadcast == ifa1->ifa_broadcast) | |
773 | ok |= BRD_OK; | |
774 | if (brd == ifa1->ifa_broadcast) | |
775 | ok |= BRD1_OK; | |
776 | if (any == ifa1->ifa_broadcast) | |
777 | ok |= BRD0_OK; | |
778 | } | |
779 | ||
780 | if (!(ok&BRD_OK)) | |
781 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim); | |
782 | if (!(ok&BRD1_OK)) | |
783 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, brd, 32, prim); | |
784 | if (!(ok&BRD0_OK)) | |
785 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, any, 32, prim); | |
786 | if (!(ok&LOCAL_OK)) { | |
787 | fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 32, prim); | |
788 | ||
789 | /* Check, that this local address finally disappeared. */ | |
790 | if (inet_addr_type(ifa->ifa_local) != RTN_LOCAL) { | |
791 | /* And the last, but not the least thing. | |
792 | We must flush stray FIB entries. | |
793 | ||
794 | First of all, we scan fib_info list searching | |
795 | for stray nexthop entries, then ignite fib_flush. | |
796 | */ | |
797 | if (fib_sync_down(ifa->ifa_local, NULL, 0)) | |
798 | fib_flush(); | |
799 | } | |
800 | } | |
801 | #undef LOCAL_OK | |
802 | #undef BRD_OK | |
803 | #undef BRD0_OK | |
804 | #undef BRD1_OK | |
805 | } | |
806 | ||
246955fe RO |
807 | static void nl_fib_lookup(struct fib_result_nl *frn, struct fib_table *tb ) |
808 | { | |
e905a9ed | 809 | |
246955fe | 810 | struct fib_result res; |
5f300893 | 811 | struct flowi fl = { .mark = frn->fl_mark, |
47dcf0cb | 812 | .nl_u = { .ip4_u = { .daddr = frn->fl_addr, |
246955fe RO |
813 | .tos = frn->fl_tos, |
814 | .scope = frn->fl_scope } } }; | |
1194ed0a | 815 | |
912a41a4 SV |
816 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
817 | res.r = NULL; | |
818 | #endif | |
819 | ||
1194ed0a | 820 | frn->err = -ENOENT; |
246955fe RO |
821 | if (tb) { |
822 | local_bh_disable(); | |
823 | ||
824 | frn->tb_id = tb->tb_id; | |
825 | frn->err = tb->tb_lookup(tb, &fl, &res); | |
826 | ||
827 | if (!frn->err) { | |
828 | frn->prefixlen = res.prefixlen; | |
829 | frn->nh_sel = res.nh_sel; | |
830 | frn->type = res.type; | |
831 | frn->scope = res.scope; | |
1194ed0a | 832 | fib_res_put(&res); |
246955fe RO |
833 | } |
834 | local_bh_enable(); | |
835 | } | |
836 | } | |
837 | ||
28f7b036 | 838 | static void nl_fib_input(struct sk_buff *skb) |
246955fe | 839 | { |
246955fe | 840 | struct fib_result_nl *frn; |
28f7b036 | 841 | struct nlmsghdr *nlh; |
246955fe | 842 | struct fib_table *tb; |
28f7b036 | 843 | u32 pid; |
1194ed0a | 844 | |
b529ccf2 | 845 | nlh = nlmsg_hdr(skb); |
ea86575e | 846 | if (skb->len < NLMSG_SPACE(0) || skb->len < nlh->nlmsg_len || |
d883a036 | 847 | nlh->nlmsg_len < NLMSG_LENGTH(sizeof(*frn))) |
ea86575e | 848 | return; |
d883a036 DL |
849 | |
850 | skb = skb_clone(skb, GFP_KERNEL); | |
851 | if (skb == NULL) | |
852 | return; | |
853 | nlh = nlmsg_hdr(skb); | |
e905a9ed | 854 | |
246955fe RO |
855 | frn = (struct fib_result_nl *) NLMSG_DATA(nlh); |
856 | tb = fib_get_table(frn->tb_id_in); | |
857 | ||
858 | nl_fib_lookup(frn, tb); | |
e905a9ed | 859 | |
1194ed0a | 860 | pid = NETLINK_CB(skb).pid; /* pid of sending process */ |
246955fe | 861 | NETLINK_CB(skb).pid = 0; /* from kernel */ |
ac6d439d | 862 | NETLINK_CB(skb).dst_group = 0; /* unicast */ |
cd40b7d3 | 863 | netlink_unicast(fibnl, skb, pid, MSG_DONTWAIT); |
e905a9ed | 864 | } |
246955fe RO |
865 | |
866 | static void nl_fib_lookup_init(void) | |
867 | { | |
cd40b7d3 DL |
868 | fibnl = netlink_kernel_create(&init_net, NETLINK_FIB_LOOKUP, 0, |
869 | nl_fib_input, NULL, THIS_MODULE); | |
246955fe RO |
870 | } |
871 | ||
1da177e4 LT |
872 | static void fib_disable_ip(struct net_device *dev, int force) |
873 | { | |
874 | if (fib_sync_down(0, dev, force)) | |
875 | fib_flush(); | |
876 | rt_cache_flush(0); | |
877 | arp_ifdown(dev); | |
878 | } | |
879 | ||
880 | static int fib_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr) | |
881 | { | |
882 | struct in_ifaddr *ifa = (struct in_ifaddr*)ptr; | |
883 | ||
884 | switch (event) { | |
885 | case NETDEV_UP: | |
886 | fib_add_ifaddr(ifa); | |
887 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
888 | fib_sync_up(ifa->ifa_dev->dev); | |
889 | #endif | |
890 | rt_cache_flush(-1); | |
891 | break; | |
892 | case NETDEV_DOWN: | |
893 | fib_del_ifaddr(ifa); | |
9fcc2e8a | 894 | if (ifa->ifa_dev->ifa_list == NULL) { |
1da177e4 LT |
895 | /* Last address was deleted from this interface. |
896 | Disable IP. | |
897 | */ | |
898 | fib_disable_ip(ifa->ifa_dev->dev, 1); | |
899 | } else { | |
900 | rt_cache_flush(-1); | |
901 | } | |
902 | break; | |
903 | } | |
904 | return NOTIFY_DONE; | |
905 | } | |
906 | ||
907 | static int fib_netdev_event(struct notifier_block *this, unsigned long event, void *ptr) | |
908 | { | |
909 | struct net_device *dev = ptr; | |
e5ed6399 | 910 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
1da177e4 | 911 | |
e9dc8653 EB |
912 | if (dev->nd_net != &init_net) |
913 | return NOTIFY_DONE; | |
914 | ||
1da177e4 LT |
915 | if (event == NETDEV_UNREGISTER) { |
916 | fib_disable_ip(dev, 2); | |
917 | return NOTIFY_DONE; | |
918 | } | |
919 | ||
920 | if (!in_dev) | |
921 | return NOTIFY_DONE; | |
922 | ||
923 | switch (event) { | |
924 | case NETDEV_UP: | |
925 | for_ifa(in_dev) { | |
926 | fib_add_ifaddr(ifa); | |
927 | } endfor_ifa(in_dev); | |
928 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
929 | fib_sync_up(dev); | |
930 | #endif | |
931 | rt_cache_flush(-1); | |
932 | break; | |
933 | case NETDEV_DOWN: | |
934 | fib_disable_ip(dev, 0); | |
935 | break; | |
936 | case NETDEV_CHANGEMTU: | |
937 | case NETDEV_CHANGE: | |
938 | rt_cache_flush(0); | |
939 | break; | |
940 | } | |
941 | return NOTIFY_DONE; | |
942 | } | |
943 | ||
944 | static struct notifier_block fib_inetaddr_notifier = { | |
945 | .notifier_call =fib_inetaddr_event, | |
946 | }; | |
947 | ||
948 | static struct notifier_block fib_netdev_notifier = { | |
949 | .notifier_call =fib_netdev_event, | |
950 | }; | |
951 | ||
952 | void __init ip_fib_init(void) | |
953 | { | |
1af5a8c4 PM |
954 | unsigned int i; |
955 | ||
956 | for (i = 0; i < FIB_TABLE_HASHSZ; i++) | |
957 | INIT_HLIST_HEAD(&fib_table_hash[i]); | |
c3e9a353 | 958 | |
dbb50165 | 959 | BUG_ON(fib4_rules_init()); |
1da177e4 LT |
960 | |
961 | register_netdevice_notifier(&fib_netdev_notifier); | |
962 | register_inetaddr_notifier(&fib_inetaddr_notifier); | |
246955fe | 963 | nl_fib_lookup_init(); |
63f3444f TG |
964 | |
965 | rtnl_register(PF_INET, RTM_NEWROUTE, inet_rtm_newroute, NULL); | |
966 | rtnl_register(PF_INET, RTM_DELROUTE, inet_rtm_delroute, NULL); | |
967 | rtnl_register(PF_INET, RTM_GETROUTE, NULL, inet_dump_fib); | |
1da177e4 LT |
968 | } |
969 | ||
970 | EXPORT_SYMBOL(inet_addr_type); | |
05538116 | 971 | EXPORT_SYMBOL(inet_dev_addr_type); |
a1e8733e | 972 | EXPORT_SYMBOL(ip_dev_find); |