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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 | 52 | static struct sock *fibnl; |
93456b6d | 53 | struct hlist_head fib_table_hash[FIB_TABLE_HASHSZ]; |
28f7b036 | 54 | |
1da177e4 LT |
55 | #ifndef CONFIG_IP_MULTIPLE_TABLES |
56 | ||
7b1a74fd | 57 | static int __net_init fib4_rules_init(struct net *net) |
c3e9a353 | 58 | { |
93456b6d DL |
59 | struct fib_table *local_table, *main_table; |
60 | ||
61 | local_table = fib_hash_init(RT_TABLE_LOCAL); | |
62 | if (local_table == NULL) | |
dbb50165 DL |
63 | return -ENOMEM; |
64 | ||
93456b6d DL |
65 | main_table = fib_hash_init(RT_TABLE_MAIN); |
66 | if (main_table == NULL) | |
dbb50165 DL |
67 | goto fail; |
68 | ||
93456b6d DL |
69 | hlist_add_head_rcu(&local_table->tb_hlist, |
70 | &fib_table_hash[TABLE_LOCAL_INDEX]); | |
71 | hlist_add_head_rcu(&main_table->tb_hlist, | |
72 | &fib_table_hash[TABLE_MAIN_INDEX]); | |
dbb50165 DL |
73 | return 0; |
74 | ||
75 | fail: | |
93456b6d | 76 | kfree(local_table); |
dbb50165 | 77 | return -ENOMEM; |
c3e9a353 | 78 | } |
1af5a8c4 | 79 | #else |
1da177e4 | 80 | |
1af5a8c4 | 81 | struct fib_table *fib_new_table(u32 id) |
1da177e4 LT |
82 | { |
83 | struct fib_table *tb; | |
1af5a8c4 | 84 | unsigned int h; |
1da177e4 | 85 | |
1af5a8c4 PM |
86 | if (id == 0) |
87 | id = RT_TABLE_MAIN; | |
88 | tb = fib_get_table(id); | |
89 | if (tb) | |
90 | return tb; | |
1da177e4 LT |
91 | tb = fib_hash_init(id); |
92 | if (!tb) | |
93 | return NULL; | |
1af5a8c4 PM |
94 | h = id & (FIB_TABLE_HASHSZ - 1); |
95 | hlist_add_head_rcu(&tb->tb_hlist, &fib_table_hash[h]); | |
1da177e4 LT |
96 | return tb; |
97 | } | |
98 | ||
1af5a8c4 PM |
99 | struct fib_table *fib_get_table(u32 id) |
100 | { | |
101 | struct fib_table *tb; | |
102 | struct hlist_node *node; | |
103 | unsigned int h; | |
1da177e4 | 104 | |
1af5a8c4 PM |
105 | if (id == 0) |
106 | id = RT_TABLE_MAIN; | |
107 | h = id & (FIB_TABLE_HASHSZ - 1); | |
108 | rcu_read_lock(); | |
109 | hlist_for_each_entry_rcu(tb, node, &fib_table_hash[h], tb_hlist) { | |
110 | if (tb->tb_id == id) { | |
111 | rcu_read_unlock(); | |
112 | return tb; | |
113 | } | |
114 | } | |
115 | rcu_read_unlock(); | |
116 | return NULL; | |
117 | } | |
1da177e4 LT |
118 | #endif /* CONFIG_IP_MULTIPLE_TABLES */ |
119 | ||
1da177e4 LT |
120 | static void fib_flush(void) |
121 | { | |
122 | int flushed = 0; | |
1da177e4 | 123 | struct fib_table *tb; |
1af5a8c4 PM |
124 | struct hlist_node *node; |
125 | unsigned int h; | |
1da177e4 | 126 | |
1af5a8c4 PM |
127 | for (h = 0; h < FIB_TABLE_HASHSZ; h++) { |
128 | hlist_for_each_entry(tb, node, &fib_table_hash[h], tb_hlist) | |
129 | flushed += tb->tb_flush(tb); | |
1da177e4 | 130 | } |
1da177e4 LT |
131 | |
132 | if (flushed) | |
133 | rt_cache_flush(-1); | |
134 | } | |
135 | ||
136 | /* | |
137 | * Find the first device with a given source address. | |
138 | */ | |
139 | ||
60cad5da | 140 | struct net_device * ip_dev_find(__be32 addr) |
1da177e4 LT |
141 | { |
142 | struct flowi fl = { .nl_u = { .ip4_u = { .daddr = addr } } }; | |
143 | struct fib_result res; | |
144 | struct net_device *dev = NULL; | |
03cf786c | 145 | struct fib_table *local_table; |
1da177e4 LT |
146 | |
147 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
148 | res.r = NULL; | |
149 | #endif | |
150 | ||
03cf786c PE |
151 | local_table = fib_get_table(RT_TABLE_LOCAL); |
152 | if (!local_table || local_table->tb_lookup(local_table, &fl, &res)) | |
1da177e4 LT |
153 | return NULL; |
154 | if (res.type != RTN_LOCAL) | |
155 | goto out; | |
156 | dev = FIB_RES_DEV(res); | |
157 | ||
158 | if (dev) | |
159 | dev_hold(dev); | |
160 | out: | |
161 | fib_res_put(&res); | |
162 | return dev; | |
163 | } | |
164 | ||
05538116 LAT |
165 | /* |
166 | * Find address type as if only "dev" was present in the system. If | |
167 | * on_dev is NULL then all interfaces are taken into consideration. | |
168 | */ | |
169 | static inline unsigned __inet_dev_addr_type(const struct net_device *dev, | |
170 | __be32 addr) | |
1da177e4 LT |
171 | { |
172 | struct flowi fl = { .nl_u = { .ip4_u = { .daddr = addr } } }; | |
173 | struct fib_result res; | |
174 | unsigned ret = RTN_BROADCAST; | |
03cf786c | 175 | struct fib_table *local_table; |
1da177e4 | 176 | |
f97c1e0c | 177 | if (ipv4_is_zeronet(addr) || ipv4_is_badclass(addr)) |
1da177e4 | 178 | return RTN_BROADCAST; |
f97c1e0c | 179 | if (ipv4_is_multicast(addr)) |
1da177e4 LT |
180 | return RTN_MULTICAST; |
181 | ||
182 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
183 | res.r = NULL; | |
184 | #endif | |
e905a9ed | 185 | |
03cf786c PE |
186 | local_table = fib_get_table(RT_TABLE_LOCAL); |
187 | if (local_table) { | |
1da177e4 | 188 | ret = RTN_UNICAST; |
03cf786c | 189 | if (!local_table->tb_lookup(local_table, &fl, &res)) { |
05538116 LAT |
190 | if (!dev || dev == res.fi->fib_dev) |
191 | ret = res.type; | |
1da177e4 LT |
192 | fib_res_put(&res); |
193 | } | |
194 | } | |
195 | return ret; | |
196 | } | |
197 | ||
05538116 LAT |
198 | unsigned int inet_addr_type(__be32 addr) |
199 | { | |
200 | return __inet_dev_addr_type(NULL, addr); | |
201 | } | |
202 | ||
203 | unsigned int inet_dev_addr_type(const struct net_device *dev, __be32 addr) | |
204 | { | |
205 | return __inet_dev_addr_type(dev, addr); | |
206 | } | |
207 | ||
1da177e4 LT |
208 | /* Given (packet source, input interface) and optional (dst, oif, tos): |
209 | - (main) check, that source is valid i.e. not broadcast or our local | |
210 | address. | |
211 | - figure out what "logical" interface this packet arrived | |
212 | and calculate "specific destination" address. | |
213 | - check, that packet arrived from expected physical interface. | |
214 | */ | |
215 | ||
d9c9df8c AV |
216 | int fib_validate_source(__be32 src, __be32 dst, u8 tos, int oif, |
217 | struct net_device *dev, __be32 *spec_dst, u32 *itag) | |
1da177e4 LT |
218 | { |
219 | struct in_device *in_dev; | |
220 | struct flowi fl = { .nl_u = { .ip4_u = | |
221 | { .daddr = src, | |
222 | .saddr = dst, | |
223 | .tos = tos } }, | |
224 | .iif = oif }; | |
225 | struct fib_result res; | |
226 | int no_addr, rpf; | |
227 | int ret; | |
228 | ||
229 | no_addr = rpf = 0; | |
230 | rcu_read_lock(); | |
e5ed6399 | 231 | in_dev = __in_dev_get_rcu(dev); |
1da177e4 LT |
232 | if (in_dev) { |
233 | no_addr = in_dev->ifa_list == NULL; | |
234 | rpf = IN_DEV_RPFILTER(in_dev); | |
235 | } | |
236 | rcu_read_unlock(); | |
237 | ||
238 | if (in_dev == NULL) | |
239 | goto e_inval; | |
240 | ||
241 | if (fib_lookup(&fl, &res)) | |
242 | goto last_resort; | |
243 | if (res.type != RTN_UNICAST) | |
244 | goto e_inval_res; | |
245 | *spec_dst = FIB_RES_PREFSRC(res); | |
246 | fib_combine_itag(itag, &res); | |
247 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
248 | if (FIB_RES_DEV(res) == dev || res.fi->fib_nhs > 1) | |
249 | #else | |
250 | if (FIB_RES_DEV(res) == dev) | |
251 | #endif | |
252 | { | |
253 | ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST; | |
254 | fib_res_put(&res); | |
255 | return ret; | |
256 | } | |
257 | fib_res_put(&res); | |
258 | if (no_addr) | |
259 | goto last_resort; | |
260 | if (rpf) | |
261 | goto e_inval; | |
262 | fl.oif = dev->ifindex; | |
263 | ||
264 | ret = 0; | |
265 | if (fib_lookup(&fl, &res) == 0) { | |
266 | if (res.type == RTN_UNICAST) { | |
267 | *spec_dst = FIB_RES_PREFSRC(res); | |
268 | ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST; | |
269 | } | |
270 | fib_res_put(&res); | |
271 | } | |
272 | return ret; | |
273 | ||
274 | last_resort: | |
275 | if (rpf) | |
276 | goto e_inval; | |
277 | *spec_dst = inet_select_addr(dev, 0, RT_SCOPE_UNIVERSE); | |
278 | *itag = 0; | |
279 | return 0; | |
280 | ||
281 | e_inval_res: | |
282 | fib_res_put(&res); | |
283 | e_inval: | |
284 | return -EINVAL; | |
285 | } | |
286 | ||
81f7bf6c | 287 | static inline __be32 sk_extract_addr(struct sockaddr *addr) |
4e902c57 TG |
288 | { |
289 | return ((struct sockaddr_in *) addr)->sin_addr.s_addr; | |
290 | } | |
291 | ||
292 | static int put_rtax(struct nlattr *mx, int len, int type, u32 value) | |
293 | { | |
294 | struct nlattr *nla; | |
295 | ||
296 | nla = (struct nlattr *) ((char *) mx + len); | |
297 | nla->nla_type = type; | |
298 | nla->nla_len = nla_attr_size(4); | |
299 | *(u32 *) nla_data(nla) = value; | |
300 | ||
301 | return len + nla_total_size(4); | |
302 | } | |
303 | ||
304 | static int rtentry_to_fib_config(int cmd, struct rtentry *rt, | |
305 | struct fib_config *cfg) | |
306 | { | |
6d85c10a | 307 | __be32 addr; |
4e902c57 TG |
308 | int plen; |
309 | ||
310 | memset(cfg, 0, sizeof(*cfg)); | |
311 | ||
312 | if (rt->rt_dst.sa_family != AF_INET) | |
313 | return -EAFNOSUPPORT; | |
314 | ||
315 | /* | |
316 | * Check mask for validity: | |
317 | * a) it must be contiguous. | |
318 | * b) destination must have all host bits clear. | |
319 | * c) if application forgot to set correct family (AF_INET), | |
320 | * reject request unless it is absolutely clear i.e. | |
321 | * both family and mask are zero. | |
322 | */ | |
323 | plen = 32; | |
324 | addr = sk_extract_addr(&rt->rt_dst); | |
325 | if (!(rt->rt_flags & RTF_HOST)) { | |
81f7bf6c | 326 | __be32 mask = sk_extract_addr(&rt->rt_genmask); |
4e902c57 TG |
327 | |
328 | if (rt->rt_genmask.sa_family != AF_INET) { | |
329 | if (mask || rt->rt_genmask.sa_family) | |
330 | return -EAFNOSUPPORT; | |
331 | } | |
332 | ||
333 | if (bad_mask(mask, addr)) | |
334 | return -EINVAL; | |
335 | ||
336 | plen = inet_mask_len(mask); | |
337 | } | |
338 | ||
339 | cfg->fc_dst_len = plen; | |
340 | cfg->fc_dst = addr; | |
341 | ||
342 | if (cmd != SIOCDELRT) { | |
343 | cfg->fc_nlflags = NLM_F_CREATE; | |
344 | cfg->fc_protocol = RTPROT_BOOT; | |
345 | } | |
346 | ||
347 | if (rt->rt_metric) | |
348 | cfg->fc_priority = rt->rt_metric - 1; | |
349 | ||
350 | if (rt->rt_flags & RTF_REJECT) { | |
351 | cfg->fc_scope = RT_SCOPE_HOST; | |
352 | cfg->fc_type = RTN_UNREACHABLE; | |
353 | return 0; | |
354 | } | |
355 | ||
356 | cfg->fc_scope = RT_SCOPE_NOWHERE; | |
357 | cfg->fc_type = RTN_UNICAST; | |
358 | ||
359 | if (rt->rt_dev) { | |
360 | char *colon; | |
361 | struct net_device *dev; | |
362 | char devname[IFNAMSIZ]; | |
363 | ||
364 | if (copy_from_user(devname, rt->rt_dev, IFNAMSIZ-1)) | |
365 | return -EFAULT; | |
366 | ||
367 | devname[IFNAMSIZ-1] = 0; | |
368 | colon = strchr(devname, ':'); | |
369 | if (colon) | |
370 | *colon = 0; | |
881d966b | 371 | dev = __dev_get_by_name(&init_net, devname); |
4e902c57 TG |
372 | if (!dev) |
373 | return -ENODEV; | |
374 | cfg->fc_oif = dev->ifindex; | |
375 | if (colon) { | |
376 | struct in_ifaddr *ifa; | |
377 | struct in_device *in_dev = __in_dev_get_rtnl(dev); | |
378 | if (!in_dev) | |
379 | return -ENODEV; | |
380 | *colon = ':'; | |
381 | for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) | |
382 | if (strcmp(ifa->ifa_label, devname) == 0) | |
383 | break; | |
384 | if (ifa == NULL) | |
385 | return -ENODEV; | |
386 | cfg->fc_prefsrc = ifa->ifa_local; | |
387 | } | |
388 | } | |
389 | ||
390 | addr = sk_extract_addr(&rt->rt_gateway); | |
391 | if (rt->rt_gateway.sa_family == AF_INET && addr) { | |
392 | cfg->fc_gw = addr; | |
393 | if (rt->rt_flags & RTF_GATEWAY && | |
394 | inet_addr_type(addr) == RTN_UNICAST) | |
395 | cfg->fc_scope = RT_SCOPE_UNIVERSE; | |
396 | } | |
397 | ||
398 | if (cmd == SIOCDELRT) | |
399 | return 0; | |
400 | ||
401 | if (rt->rt_flags & RTF_GATEWAY && !cfg->fc_gw) | |
402 | return -EINVAL; | |
403 | ||
404 | if (cfg->fc_scope == RT_SCOPE_NOWHERE) | |
405 | cfg->fc_scope = RT_SCOPE_LINK; | |
406 | ||
407 | if (rt->rt_flags & (RTF_MTU | RTF_WINDOW | RTF_IRTT)) { | |
408 | struct nlattr *mx; | |
409 | int len = 0; | |
410 | ||
411 | mx = kzalloc(3 * nla_total_size(4), GFP_KERNEL); | |
e905a9ed | 412 | if (mx == NULL) |
4e902c57 TG |
413 | return -ENOMEM; |
414 | ||
415 | if (rt->rt_flags & RTF_MTU) | |
416 | len = put_rtax(mx, len, RTAX_ADVMSS, rt->rt_mtu - 40); | |
417 | ||
418 | if (rt->rt_flags & RTF_WINDOW) | |
419 | len = put_rtax(mx, len, RTAX_WINDOW, rt->rt_window); | |
420 | ||
421 | if (rt->rt_flags & RTF_IRTT) | |
422 | len = put_rtax(mx, len, RTAX_RTT, rt->rt_irtt << 3); | |
423 | ||
424 | cfg->fc_mx = mx; | |
425 | cfg->fc_mx_len = len; | |
426 | } | |
427 | ||
428 | return 0; | |
429 | } | |
430 | ||
1da177e4 LT |
431 | /* |
432 | * Handle IP routing ioctl calls. These are used to manipulate the routing tables | |
433 | */ | |
e905a9ed | 434 | |
1da177e4 LT |
435 | int ip_rt_ioctl(unsigned int cmd, void __user *arg) |
436 | { | |
4e902c57 TG |
437 | struct fib_config cfg; |
438 | struct rtentry rt; | |
1da177e4 | 439 | int err; |
1da177e4 LT |
440 | |
441 | switch (cmd) { | |
442 | case SIOCADDRT: /* Add a route */ | |
443 | case SIOCDELRT: /* Delete a route */ | |
444 | if (!capable(CAP_NET_ADMIN)) | |
445 | return -EPERM; | |
4e902c57 TG |
446 | |
447 | if (copy_from_user(&rt, arg, sizeof(rt))) | |
1da177e4 | 448 | return -EFAULT; |
4e902c57 | 449 | |
1da177e4 | 450 | rtnl_lock(); |
4e902c57 | 451 | err = rtentry_to_fib_config(cmd, &rt, &cfg); |
1da177e4 | 452 | if (err == 0) { |
4e902c57 TG |
453 | struct fib_table *tb; |
454 | ||
1da177e4 | 455 | if (cmd == SIOCDELRT) { |
4e902c57 | 456 | tb = fib_get_table(cfg.fc_table); |
1da177e4 | 457 | if (tb) |
4e902c57 TG |
458 | err = tb->tb_delete(tb, &cfg); |
459 | else | |
460 | err = -ESRCH; | |
1da177e4 | 461 | } else { |
4e902c57 | 462 | tb = fib_new_table(cfg.fc_table); |
1da177e4 | 463 | if (tb) |
4e902c57 TG |
464 | err = tb->tb_insert(tb, &cfg); |
465 | else | |
466 | err = -ENOBUFS; | |
1da177e4 | 467 | } |
4e902c57 TG |
468 | |
469 | /* allocated by rtentry_to_fib_config() */ | |
470 | kfree(cfg.fc_mx); | |
1da177e4 LT |
471 | } |
472 | rtnl_unlock(); | |
473 | return err; | |
474 | } | |
475 | return -EINVAL; | |
476 | } | |
477 | ||
ef7c79ed | 478 | const struct nla_policy rtm_ipv4_policy[RTA_MAX+1] = { |
4e902c57 TG |
479 | [RTA_DST] = { .type = NLA_U32 }, |
480 | [RTA_SRC] = { .type = NLA_U32 }, | |
481 | [RTA_IIF] = { .type = NLA_U32 }, | |
482 | [RTA_OIF] = { .type = NLA_U32 }, | |
483 | [RTA_GATEWAY] = { .type = NLA_U32 }, | |
484 | [RTA_PRIORITY] = { .type = NLA_U32 }, | |
485 | [RTA_PREFSRC] = { .type = NLA_U32 }, | |
486 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
5176f91e | 487 | [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) }, |
4e902c57 TG |
488 | [RTA_PROTOINFO] = { .type = NLA_U32 }, |
489 | [RTA_FLOW] = { .type = NLA_U32 }, | |
4e902c57 TG |
490 | }; |
491 | ||
492 | static int rtm_to_fib_config(struct sk_buff *skb, struct nlmsghdr *nlh, | |
493 | struct fib_config *cfg) | |
1da177e4 | 494 | { |
4e902c57 TG |
495 | struct nlattr *attr; |
496 | int err, remaining; | |
497 | struct rtmsg *rtm; | |
498 | ||
499 | err = nlmsg_validate(nlh, sizeof(*rtm), RTA_MAX, rtm_ipv4_policy); | |
500 | if (err < 0) | |
501 | goto errout; | |
502 | ||
503 | memset(cfg, 0, sizeof(*cfg)); | |
504 | ||
505 | rtm = nlmsg_data(nlh); | |
4e902c57 | 506 | cfg->fc_dst_len = rtm->rtm_dst_len; |
4e902c57 TG |
507 | cfg->fc_tos = rtm->rtm_tos; |
508 | cfg->fc_table = rtm->rtm_table; | |
509 | cfg->fc_protocol = rtm->rtm_protocol; | |
510 | cfg->fc_scope = rtm->rtm_scope; | |
511 | cfg->fc_type = rtm->rtm_type; | |
512 | cfg->fc_flags = rtm->rtm_flags; | |
513 | cfg->fc_nlflags = nlh->nlmsg_flags; | |
514 | ||
515 | cfg->fc_nlinfo.pid = NETLINK_CB(skb).pid; | |
516 | cfg->fc_nlinfo.nlh = nlh; | |
517 | ||
a0ee18b9 TG |
518 | if (cfg->fc_type > RTN_MAX) { |
519 | err = -EINVAL; | |
520 | goto errout; | |
521 | } | |
522 | ||
4e902c57 | 523 | nlmsg_for_each_attr(attr, nlh, sizeof(struct rtmsg), remaining) { |
8f4c1f9b | 524 | switch (nla_type(attr)) { |
4e902c57 | 525 | case RTA_DST: |
17fb2c64 | 526 | cfg->fc_dst = nla_get_be32(attr); |
4e902c57 | 527 | break; |
4e902c57 TG |
528 | case RTA_OIF: |
529 | cfg->fc_oif = nla_get_u32(attr); | |
530 | break; | |
531 | case RTA_GATEWAY: | |
17fb2c64 | 532 | cfg->fc_gw = nla_get_be32(attr); |
4e902c57 TG |
533 | break; |
534 | case RTA_PRIORITY: | |
535 | cfg->fc_priority = nla_get_u32(attr); | |
536 | break; | |
537 | case RTA_PREFSRC: | |
17fb2c64 | 538 | cfg->fc_prefsrc = nla_get_be32(attr); |
4e902c57 TG |
539 | break; |
540 | case RTA_METRICS: | |
541 | cfg->fc_mx = nla_data(attr); | |
542 | cfg->fc_mx_len = nla_len(attr); | |
543 | break; | |
544 | case RTA_MULTIPATH: | |
545 | cfg->fc_mp = nla_data(attr); | |
546 | cfg->fc_mp_len = nla_len(attr); | |
547 | break; | |
548 | case RTA_FLOW: | |
549 | cfg->fc_flow = nla_get_u32(attr); | |
550 | break; | |
4e902c57 TG |
551 | case RTA_TABLE: |
552 | cfg->fc_table = nla_get_u32(attr); | |
553 | break; | |
1da177e4 LT |
554 | } |
555 | } | |
4e902c57 | 556 | |
1da177e4 | 557 | return 0; |
4e902c57 TG |
558 | errout: |
559 | return err; | |
1da177e4 LT |
560 | } |
561 | ||
63f3444f | 562 | static int inet_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 563 | { |
b854272b | 564 | struct net *net = skb->sk->sk_net; |
4e902c57 TG |
565 | struct fib_config cfg; |
566 | struct fib_table *tb; | |
567 | int err; | |
1da177e4 | 568 | |
b854272b DL |
569 | if (net != &init_net) |
570 | return -EINVAL; | |
571 | ||
4e902c57 TG |
572 | err = rtm_to_fib_config(skb, nlh, &cfg); |
573 | if (err < 0) | |
574 | goto errout; | |
1da177e4 | 575 | |
4e902c57 TG |
576 | tb = fib_get_table(cfg.fc_table); |
577 | if (tb == NULL) { | |
578 | err = -ESRCH; | |
579 | goto errout; | |
580 | } | |
581 | ||
582 | err = tb->tb_delete(tb, &cfg); | |
583 | errout: | |
584 | return err; | |
1da177e4 LT |
585 | } |
586 | ||
63f3444f | 587 | static int inet_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 588 | { |
b854272b | 589 | struct net *net = skb->sk->sk_net; |
4e902c57 TG |
590 | struct fib_config cfg; |
591 | struct fib_table *tb; | |
592 | int err; | |
1da177e4 | 593 | |
b854272b DL |
594 | if (net != &init_net) |
595 | return -EINVAL; | |
596 | ||
4e902c57 TG |
597 | err = rtm_to_fib_config(skb, nlh, &cfg); |
598 | if (err < 0) | |
599 | goto errout; | |
1da177e4 | 600 | |
4e902c57 TG |
601 | tb = fib_new_table(cfg.fc_table); |
602 | if (tb == NULL) { | |
603 | err = -ENOBUFS; | |
604 | goto errout; | |
605 | } | |
606 | ||
607 | err = tb->tb_insert(tb, &cfg); | |
608 | errout: | |
609 | return err; | |
1da177e4 LT |
610 | } |
611 | ||
63f3444f | 612 | static int inet_dump_fib(struct sk_buff *skb, struct netlink_callback *cb) |
1da177e4 | 613 | { |
b854272b | 614 | struct net *net = skb->sk->sk_net; |
1af5a8c4 PM |
615 | unsigned int h, s_h; |
616 | unsigned int e = 0, s_e; | |
1da177e4 | 617 | struct fib_table *tb; |
1af5a8c4 PM |
618 | struct hlist_node *node; |
619 | int dumped = 0; | |
1da177e4 | 620 | |
b854272b DL |
621 | if (net != &init_net) |
622 | return 0; | |
623 | ||
be403ea1 TG |
624 | if (nlmsg_len(cb->nlh) >= sizeof(struct rtmsg) && |
625 | ((struct rtmsg *) nlmsg_data(cb->nlh))->rtm_flags & RTM_F_CLONED) | |
1da177e4 LT |
626 | return ip_rt_dump(skb, cb); |
627 | ||
1af5a8c4 PM |
628 | s_h = cb->args[0]; |
629 | s_e = cb->args[1]; | |
630 | ||
631 | for (h = s_h; h < FIB_TABLE_HASHSZ; h++, s_e = 0) { | |
632 | e = 0; | |
633 | hlist_for_each_entry(tb, node, &fib_table_hash[h], tb_hlist) { | |
634 | if (e < s_e) | |
635 | goto next; | |
636 | if (dumped) | |
637 | memset(&cb->args[2], 0, sizeof(cb->args) - | |
e905a9ed | 638 | 2 * sizeof(cb->args[0])); |
1af5a8c4 PM |
639 | if (tb->tb_dump(tb, skb, cb) < 0) |
640 | goto out; | |
641 | dumped = 1; | |
642 | next: | |
643 | e++; | |
644 | } | |
1da177e4 | 645 | } |
1af5a8c4 PM |
646 | out: |
647 | cb->args[1] = e; | |
648 | cb->args[0] = h; | |
1da177e4 LT |
649 | |
650 | return skb->len; | |
651 | } | |
652 | ||
653 | /* Prepare and feed intra-kernel routing request. | |
654 | Really, it should be netlink message, but :-( netlink | |
655 | can be not configured, so that we feed it directly | |
656 | to fib engine. It is legal, because all events occur | |
657 | only when netlink is already locked. | |
658 | */ | |
659 | ||
81f7bf6c | 660 | static void fib_magic(int cmd, int type, __be32 dst, int dst_len, struct in_ifaddr *ifa) |
1da177e4 | 661 | { |
4e902c57 TG |
662 | struct fib_table *tb; |
663 | struct fib_config cfg = { | |
664 | .fc_protocol = RTPROT_KERNEL, | |
665 | .fc_type = type, | |
666 | .fc_dst = dst, | |
667 | .fc_dst_len = dst_len, | |
668 | .fc_prefsrc = ifa->ifa_local, | |
669 | .fc_oif = ifa->ifa_dev->dev->ifindex, | |
670 | .fc_nlflags = NLM_F_CREATE | NLM_F_APPEND, | |
671 | }; | |
1da177e4 LT |
672 | |
673 | if (type == RTN_UNICAST) | |
674 | tb = fib_new_table(RT_TABLE_MAIN); | |
675 | else | |
676 | tb = fib_new_table(RT_TABLE_LOCAL); | |
677 | ||
678 | if (tb == NULL) | |
679 | return; | |
680 | ||
4e902c57 | 681 | cfg.fc_table = tb->tb_id; |
1da177e4 | 682 | |
4e902c57 TG |
683 | if (type != RTN_LOCAL) |
684 | cfg.fc_scope = RT_SCOPE_LINK; | |
685 | else | |
686 | cfg.fc_scope = RT_SCOPE_HOST; | |
1da177e4 LT |
687 | |
688 | if (cmd == RTM_NEWROUTE) | |
4e902c57 | 689 | tb->tb_insert(tb, &cfg); |
1da177e4 | 690 | else |
4e902c57 | 691 | tb->tb_delete(tb, &cfg); |
1da177e4 LT |
692 | } |
693 | ||
0ff60a45 | 694 | void fib_add_ifaddr(struct in_ifaddr *ifa) |
1da177e4 LT |
695 | { |
696 | struct in_device *in_dev = ifa->ifa_dev; | |
697 | struct net_device *dev = in_dev->dev; | |
698 | struct in_ifaddr *prim = ifa; | |
a144ea4b AV |
699 | __be32 mask = ifa->ifa_mask; |
700 | __be32 addr = ifa->ifa_local; | |
701 | __be32 prefix = ifa->ifa_address&mask; | |
1da177e4 LT |
702 | |
703 | if (ifa->ifa_flags&IFA_F_SECONDARY) { | |
704 | prim = inet_ifa_byprefix(in_dev, prefix, mask); | |
705 | if (prim == NULL) { | |
706 | printk(KERN_DEBUG "fib_add_ifaddr: bug: prim == NULL\n"); | |
707 | return; | |
708 | } | |
709 | } | |
710 | ||
711 | fib_magic(RTM_NEWROUTE, RTN_LOCAL, addr, 32, prim); | |
712 | ||
713 | if (!(dev->flags&IFF_UP)) | |
714 | return; | |
715 | ||
716 | /* Add broadcast address, if it is explicitly assigned. */ | |
a144ea4b | 717 | if (ifa->ifa_broadcast && ifa->ifa_broadcast != htonl(0xFFFFFFFF)) |
1da177e4 LT |
718 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim); |
719 | ||
f97c1e0c | 720 | if (!ipv4_is_zeronet(prefix) && !(ifa->ifa_flags&IFA_F_SECONDARY) && |
1da177e4 LT |
721 | (prefix != addr || ifa->ifa_prefixlen < 32)) { |
722 | fib_magic(RTM_NEWROUTE, dev->flags&IFF_LOOPBACK ? RTN_LOCAL : | |
723 | RTN_UNICAST, prefix, ifa->ifa_prefixlen, prim); | |
724 | ||
725 | /* Add network specific broadcasts, when it takes a sense */ | |
726 | if (ifa->ifa_prefixlen < 31) { | |
727 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix, 32, prim); | |
728 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix|~mask, 32, prim); | |
729 | } | |
730 | } | |
731 | } | |
732 | ||
733 | static void fib_del_ifaddr(struct in_ifaddr *ifa) | |
734 | { | |
735 | struct in_device *in_dev = ifa->ifa_dev; | |
736 | struct net_device *dev = in_dev->dev; | |
737 | struct in_ifaddr *ifa1; | |
738 | struct in_ifaddr *prim = ifa; | |
a144ea4b AV |
739 | __be32 brd = ifa->ifa_address|~ifa->ifa_mask; |
740 | __be32 any = ifa->ifa_address&ifa->ifa_mask; | |
1da177e4 LT |
741 | #define LOCAL_OK 1 |
742 | #define BRD_OK 2 | |
743 | #define BRD0_OK 4 | |
744 | #define BRD1_OK 8 | |
745 | unsigned ok = 0; | |
746 | ||
747 | if (!(ifa->ifa_flags&IFA_F_SECONDARY)) | |
748 | fib_magic(RTM_DELROUTE, dev->flags&IFF_LOOPBACK ? RTN_LOCAL : | |
749 | RTN_UNICAST, any, ifa->ifa_prefixlen, prim); | |
750 | else { | |
751 | prim = inet_ifa_byprefix(in_dev, any, ifa->ifa_mask); | |
752 | if (prim == NULL) { | |
753 | printk(KERN_DEBUG "fib_del_ifaddr: bug: prim == NULL\n"); | |
754 | return; | |
755 | } | |
756 | } | |
757 | ||
758 | /* Deletion is more complicated than add. | |
759 | We should take care of not to delete too much :-) | |
760 | ||
761 | Scan address list to be sure that addresses are really gone. | |
762 | */ | |
763 | ||
764 | for (ifa1 = in_dev->ifa_list; ifa1; ifa1 = ifa1->ifa_next) { | |
765 | if (ifa->ifa_local == ifa1->ifa_local) | |
766 | ok |= LOCAL_OK; | |
767 | if (ifa->ifa_broadcast == ifa1->ifa_broadcast) | |
768 | ok |= BRD_OK; | |
769 | if (brd == ifa1->ifa_broadcast) | |
770 | ok |= BRD1_OK; | |
771 | if (any == ifa1->ifa_broadcast) | |
772 | ok |= BRD0_OK; | |
773 | } | |
774 | ||
775 | if (!(ok&BRD_OK)) | |
776 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim); | |
777 | if (!(ok&BRD1_OK)) | |
778 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, brd, 32, prim); | |
779 | if (!(ok&BRD0_OK)) | |
780 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, any, 32, prim); | |
781 | if (!(ok&LOCAL_OK)) { | |
782 | fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 32, prim); | |
783 | ||
784 | /* Check, that this local address finally disappeared. */ | |
785 | if (inet_addr_type(ifa->ifa_local) != RTN_LOCAL) { | |
786 | /* And the last, but not the least thing. | |
787 | We must flush stray FIB entries. | |
788 | ||
789 | First of all, we scan fib_info list searching | |
790 | for stray nexthop entries, then ignite fib_flush. | |
791 | */ | |
792 | if (fib_sync_down(ifa->ifa_local, NULL, 0)) | |
793 | fib_flush(); | |
794 | } | |
795 | } | |
796 | #undef LOCAL_OK | |
797 | #undef BRD_OK | |
798 | #undef BRD0_OK | |
799 | #undef BRD1_OK | |
800 | } | |
801 | ||
246955fe RO |
802 | static void nl_fib_lookup(struct fib_result_nl *frn, struct fib_table *tb ) |
803 | { | |
e905a9ed | 804 | |
246955fe | 805 | struct fib_result res; |
5f300893 | 806 | struct flowi fl = { .mark = frn->fl_mark, |
47dcf0cb | 807 | .nl_u = { .ip4_u = { .daddr = frn->fl_addr, |
246955fe RO |
808 | .tos = frn->fl_tos, |
809 | .scope = frn->fl_scope } } }; | |
1194ed0a | 810 | |
912a41a4 SV |
811 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
812 | res.r = NULL; | |
813 | #endif | |
814 | ||
1194ed0a | 815 | frn->err = -ENOENT; |
246955fe RO |
816 | if (tb) { |
817 | local_bh_disable(); | |
818 | ||
819 | frn->tb_id = tb->tb_id; | |
820 | frn->err = tb->tb_lookup(tb, &fl, &res); | |
821 | ||
822 | if (!frn->err) { | |
823 | frn->prefixlen = res.prefixlen; | |
824 | frn->nh_sel = res.nh_sel; | |
825 | frn->type = res.type; | |
826 | frn->scope = res.scope; | |
1194ed0a | 827 | fib_res_put(&res); |
246955fe RO |
828 | } |
829 | local_bh_enable(); | |
830 | } | |
831 | } | |
832 | ||
28f7b036 | 833 | static void nl_fib_input(struct sk_buff *skb) |
246955fe | 834 | { |
246955fe | 835 | struct fib_result_nl *frn; |
28f7b036 | 836 | struct nlmsghdr *nlh; |
246955fe | 837 | struct fib_table *tb; |
28f7b036 | 838 | u32 pid; |
1194ed0a | 839 | |
b529ccf2 | 840 | nlh = nlmsg_hdr(skb); |
ea86575e | 841 | if (skb->len < NLMSG_SPACE(0) || skb->len < nlh->nlmsg_len || |
d883a036 | 842 | nlh->nlmsg_len < NLMSG_LENGTH(sizeof(*frn))) |
ea86575e | 843 | return; |
d883a036 DL |
844 | |
845 | skb = skb_clone(skb, GFP_KERNEL); | |
846 | if (skb == NULL) | |
847 | return; | |
848 | nlh = nlmsg_hdr(skb); | |
e905a9ed | 849 | |
246955fe RO |
850 | frn = (struct fib_result_nl *) NLMSG_DATA(nlh); |
851 | tb = fib_get_table(frn->tb_id_in); | |
852 | ||
853 | nl_fib_lookup(frn, tb); | |
e905a9ed | 854 | |
1194ed0a | 855 | pid = NETLINK_CB(skb).pid; /* pid of sending process */ |
246955fe | 856 | NETLINK_CB(skb).pid = 0; /* from kernel */ |
ac6d439d | 857 | NETLINK_CB(skb).dst_group = 0; /* unicast */ |
cd40b7d3 | 858 | netlink_unicast(fibnl, skb, pid, MSG_DONTWAIT); |
e905a9ed | 859 | } |
246955fe | 860 | |
7b1a74fd | 861 | static int nl_fib_lookup_init(struct net *net) |
246955fe | 862 | { |
7b1a74fd | 863 | fibnl = netlink_kernel_create(net, NETLINK_FIB_LOOKUP, 0, |
cd40b7d3 | 864 | nl_fib_input, NULL, THIS_MODULE); |
7b1a74fd DL |
865 | if (fibnl == NULL) |
866 | return -EAFNOSUPPORT; | |
867 | return 0; | |
868 | } | |
869 | ||
870 | static void nl_fib_lookup_exit(struct net *net) | |
871 | { | |
872 | sock_put(fibnl); | |
246955fe RO |
873 | } |
874 | ||
1da177e4 LT |
875 | static void fib_disable_ip(struct net_device *dev, int force) |
876 | { | |
877 | if (fib_sync_down(0, dev, force)) | |
878 | fib_flush(); | |
879 | rt_cache_flush(0); | |
880 | arp_ifdown(dev); | |
881 | } | |
882 | ||
883 | static int fib_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr) | |
884 | { | |
885 | struct in_ifaddr *ifa = (struct in_ifaddr*)ptr; | |
886 | ||
887 | switch (event) { | |
888 | case NETDEV_UP: | |
889 | fib_add_ifaddr(ifa); | |
890 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
891 | fib_sync_up(ifa->ifa_dev->dev); | |
892 | #endif | |
893 | rt_cache_flush(-1); | |
894 | break; | |
895 | case NETDEV_DOWN: | |
896 | fib_del_ifaddr(ifa); | |
9fcc2e8a | 897 | if (ifa->ifa_dev->ifa_list == NULL) { |
1da177e4 LT |
898 | /* Last address was deleted from this interface. |
899 | Disable IP. | |
900 | */ | |
901 | fib_disable_ip(ifa->ifa_dev->dev, 1); | |
902 | } else { | |
903 | rt_cache_flush(-1); | |
904 | } | |
905 | break; | |
906 | } | |
907 | return NOTIFY_DONE; | |
908 | } | |
909 | ||
910 | static int fib_netdev_event(struct notifier_block *this, unsigned long event, void *ptr) | |
911 | { | |
912 | struct net_device *dev = ptr; | |
e5ed6399 | 913 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
1da177e4 | 914 | |
e9dc8653 EB |
915 | if (dev->nd_net != &init_net) |
916 | return NOTIFY_DONE; | |
917 | ||
1da177e4 LT |
918 | if (event == NETDEV_UNREGISTER) { |
919 | fib_disable_ip(dev, 2); | |
920 | return NOTIFY_DONE; | |
921 | } | |
922 | ||
923 | if (!in_dev) | |
924 | return NOTIFY_DONE; | |
925 | ||
926 | switch (event) { | |
927 | case NETDEV_UP: | |
928 | for_ifa(in_dev) { | |
929 | fib_add_ifaddr(ifa); | |
930 | } endfor_ifa(in_dev); | |
931 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
932 | fib_sync_up(dev); | |
933 | #endif | |
934 | rt_cache_flush(-1); | |
935 | break; | |
936 | case NETDEV_DOWN: | |
937 | fib_disable_ip(dev, 0); | |
938 | break; | |
939 | case NETDEV_CHANGEMTU: | |
940 | case NETDEV_CHANGE: | |
941 | rt_cache_flush(0); | |
942 | break; | |
943 | } | |
944 | return NOTIFY_DONE; | |
945 | } | |
946 | ||
947 | static struct notifier_block fib_inetaddr_notifier = { | |
948 | .notifier_call =fib_inetaddr_event, | |
949 | }; | |
950 | ||
951 | static struct notifier_block fib_netdev_notifier = { | |
952 | .notifier_call =fib_netdev_event, | |
953 | }; | |
954 | ||
7b1a74fd | 955 | static int __net_init ip_fib_net_init(struct net *net) |
1da177e4 | 956 | { |
1af5a8c4 PM |
957 | unsigned int i; |
958 | ||
959 | for (i = 0; i < FIB_TABLE_HASHSZ; i++) | |
960 | INIT_HLIST_HEAD(&fib_table_hash[i]); | |
c3e9a353 | 961 | |
7b1a74fd DL |
962 | return fib4_rules_init(net); |
963 | } | |
1da177e4 | 964 | |
7b1a74fd DL |
965 | static void __net_exit ip_fib_net_exit(struct net *net) |
966 | { | |
967 | unsigned int i; | |
968 | ||
969 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
970 | fib4_rules_exit(net); | |
971 | #endif | |
972 | ||
973 | for (i = 0; i < FIB_TABLE_HASHSZ; i++) { | |
974 | struct fib_table *tb; | |
975 | struct hlist_head *head; | |
976 | struct hlist_node *node, *tmp; | |
63f3444f | 977 | |
7b1a74fd DL |
978 | head = &fib_table_hash[i]; |
979 | hlist_for_each_entry_safe(tb, node, tmp, head, tb_hlist) { | |
980 | hlist_del(node); | |
981 | tb->tb_flush(tb); | |
982 | kfree(tb); | |
983 | } | |
984 | } | |
985 | } | |
986 | ||
987 | static int __net_init fib_net_init(struct net *net) | |
988 | { | |
989 | int error; | |
990 | ||
991 | error = 0; | |
992 | if (net != &init_net) | |
993 | goto out; | |
994 | ||
995 | error = ip_fib_net_init(net); | |
996 | if (error < 0) | |
997 | goto out; | |
998 | error = nl_fib_lookup_init(net); | |
999 | if (error < 0) | |
1000 | goto out_nlfl; | |
1001 | error = fib_proc_init(net); | |
1002 | if (error < 0) | |
1003 | goto out_proc; | |
1004 | out: | |
1005 | return error; | |
1006 | ||
1007 | out_proc: | |
1008 | nl_fib_lookup_exit(net); | |
1009 | out_nlfl: | |
1010 | ip_fib_net_exit(net); | |
1011 | goto out; | |
1012 | } | |
1013 | ||
1014 | static void __net_exit fib_net_exit(struct net *net) | |
1015 | { | |
1016 | fib_proc_exit(net); | |
1017 | nl_fib_lookup_exit(net); | |
1018 | ip_fib_net_exit(net); | |
1019 | } | |
1020 | ||
1021 | static struct pernet_operations fib_net_ops = { | |
1022 | .init = fib_net_init, | |
1023 | .exit = fib_net_exit, | |
1024 | }; | |
1025 | ||
1026 | void __init ip_fib_init(void) | |
1027 | { | |
63f3444f TG |
1028 | rtnl_register(PF_INET, RTM_NEWROUTE, inet_rtm_newroute, NULL); |
1029 | rtnl_register(PF_INET, RTM_DELROUTE, inet_rtm_delroute, NULL); | |
1030 | rtnl_register(PF_INET, RTM_GETROUTE, NULL, inet_dump_fib); | |
7b1a74fd DL |
1031 | |
1032 | register_pernet_subsys(&fib_net_ops); | |
1033 | register_netdevice_notifier(&fib_netdev_notifier); | |
1034 | register_inetaddr_notifier(&fib_inetaddr_notifier); | |
1da177e4 LT |
1035 | } |
1036 | ||
1037 | EXPORT_SYMBOL(inet_addr_type); | |
05538116 | 1038 | EXPORT_SYMBOL(inet_dev_addr_type); |
a1e8733e | 1039 | EXPORT_SYMBOL(ip_dev_find); |