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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 | |
c3e9a353 PE |
62 | static void __init fib4_rules_init(void) |
63 | { | |
64 | ip_fib_local_table = fib_hash_init(RT_TABLE_LOCAL); | |
65 | hlist_add_head_rcu(&ip_fib_local_table->tb_hlist, &fib_table_hash[0]); | |
66 | ip_fib_main_table = fib_hash_init(RT_TABLE_MAIN); | |
67 | hlist_add_head_rcu(&ip_fib_main_table->tb_hlist, &fib_table_hash[0]); | |
68 | } | |
1af5a8c4 | 69 | #else |
1da177e4 | 70 | |
1af5a8c4 PM |
71 | #define FIB_TABLE_HASHSZ 256 |
72 | static struct hlist_head fib_table_hash[FIB_TABLE_HASHSZ]; | |
1da177e4 | 73 | |
1af5a8c4 | 74 | struct fib_table *fib_new_table(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; | |
81 | tb = fib_get_table(id); | |
82 | if (tb) | |
83 | return tb; | |
1da177e4 LT |
84 | tb = fib_hash_init(id); |
85 | if (!tb) | |
86 | return NULL; | |
1af5a8c4 PM |
87 | h = id & (FIB_TABLE_HASHSZ - 1); |
88 | hlist_add_head_rcu(&tb->tb_hlist, &fib_table_hash[h]); | |
1da177e4 LT |
89 | return tb; |
90 | } | |
91 | ||
1af5a8c4 PM |
92 | struct fib_table *fib_get_table(u32 id) |
93 | { | |
94 | struct fib_table *tb; | |
95 | struct hlist_node *node; | |
96 | unsigned int h; | |
1da177e4 | 97 | |
1af5a8c4 PM |
98 | if (id == 0) |
99 | id = RT_TABLE_MAIN; | |
100 | h = id & (FIB_TABLE_HASHSZ - 1); | |
101 | rcu_read_lock(); | |
102 | hlist_for_each_entry_rcu(tb, node, &fib_table_hash[h], tb_hlist) { | |
103 | if (tb->tb_id == id) { | |
104 | rcu_read_unlock(); | |
105 | return tb; | |
106 | } | |
107 | } | |
108 | rcu_read_unlock(); | |
109 | return NULL; | |
110 | } | |
1da177e4 LT |
111 | #endif /* CONFIG_IP_MULTIPLE_TABLES */ |
112 | ||
1da177e4 LT |
113 | static void fib_flush(void) |
114 | { | |
115 | int flushed = 0; | |
1da177e4 | 116 | struct fib_table *tb; |
1af5a8c4 PM |
117 | struct hlist_node *node; |
118 | unsigned int h; | |
1da177e4 | 119 | |
1af5a8c4 PM |
120 | for (h = 0; h < FIB_TABLE_HASHSZ; h++) { |
121 | hlist_for_each_entry(tb, node, &fib_table_hash[h], tb_hlist) | |
122 | flushed += tb->tb_flush(tb); | |
1da177e4 | 123 | } |
1da177e4 LT |
124 | |
125 | if (flushed) | |
126 | rt_cache_flush(-1); | |
127 | } | |
128 | ||
129 | /* | |
130 | * Find the first device with a given source address. | |
131 | */ | |
132 | ||
60cad5da | 133 | struct net_device * ip_dev_find(__be32 addr) |
1da177e4 LT |
134 | { |
135 | struct flowi fl = { .nl_u = { .ip4_u = { .daddr = addr } } }; | |
136 | struct fib_result res; | |
137 | struct net_device *dev = NULL; | |
03cf786c | 138 | struct fib_table *local_table; |
1da177e4 LT |
139 | |
140 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
141 | res.r = NULL; | |
142 | #endif | |
143 | ||
03cf786c PE |
144 | local_table = fib_get_table(RT_TABLE_LOCAL); |
145 | if (!local_table || local_table->tb_lookup(local_table, &fl, &res)) | |
1da177e4 LT |
146 | return NULL; |
147 | if (res.type != RTN_LOCAL) | |
148 | goto out; | |
149 | dev = FIB_RES_DEV(res); | |
150 | ||
151 | if (dev) | |
152 | dev_hold(dev); | |
153 | out: | |
154 | fib_res_put(&res); | |
155 | return dev; | |
156 | } | |
157 | ||
05538116 LAT |
158 | /* |
159 | * Find address type as if only "dev" was present in the system. If | |
160 | * on_dev is NULL then all interfaces are taken into consideration. | |
161 | */ | |
162 | static inline unsigned __inet_dev_addr_type(const struct net_device *dev, | |
163 | __be32 addr) | |
1da177e4 LT |
164 | { |
165 | struct flowi fl = { .nl_u = { .ip4_u = { .daddr = addr } } }; | |
166 | struct fib_result res; | |
167 | unsigned ret = RTN_BROADCAST; | |
03cf786c | 168 | struct fib_table *local_table; |
1da177e4 | 169 | |
f97c1e0c | 170 | if (ipv4_is_zeronet(addr) || ipv4_is_badclass(addr)) |
1da177e4 | 171 | return RTN_BROADCAST; |
f97c1e0c | 172 | if (ipv4_is_multicast(addr)) |
1da177e4 LT |
173 | return RTN_MULTICAST; |
174 | ||
175 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
176 | res.r = NULL; | |
177 | #endif | |
e905a9ed | 178 | |
03cf786c PE |
179 | local_table = fib_get_table(RT_TABLE_LOCAL); |
180 | if (local_table) { | |
1da177e4 | 181 | ret = RTN_UNICAST; |
03cf786c | 182 | if (!local_table->tb_lookup(local_table, &fl, &res)) { |
05538116 LAT |
183 | if (!dev || dev == res.fi->fib_dev) |
184 | ret = res.type; | |
1da177e4 LT |
185 | fib_res_put(&res); |
186 | } | |
187 | } | |
188 | return ret; | |
189 | } | |
190 | ||
05538116 LAT |
191 | unsigned int inet_addr_type(__be32 addr) |
192 | { | |
193 | return __inet_dev_addr_type(NULL, addr); | |
194 | } | |
195 | ||
196 | unsigned int inet_dev_addr_type(const struct net_device *dev, __be32 addr) | |
197 | { | |
198 | return __inet_dev_addr_type(dev, addr); | |
199 | } | |
200 | ||
1da177e4 LT |
201 | /* Given (packet source, input interface) and optional (dst, oif, tos): |
202 | - (main) check, that source is valid i.e. not broadcast or our local | |
203 | address. | |
204 | - figure out what "logical" interface this packet arrived | |
205 | and calculate "specific destination" address. | |
206 | - check, that packet arrived from expected physical interface. | |
207 | */ | |
208 | ||
d9c9df8c AV |
209 | int fib_validate_source(__be32 src, __be32 dst, u8 tos, int oif, |
210 | struct net_device *dev, __be32 *spec_dst, u32 *itag) | |
1da177e4 LT |
211 | { |
212 | struct in_device *in_dev; | |
213 | struct flowi fl = { .nl_u = { .ip4_u = | |
214 | { .daddr = src, | |
215 | .saddr = dst, | |
216 | .tos = tos } }, | |
217 | .iif = oif }; | |
218 | struct fib_result res; | |
219 | int no_addr, rpf; | |
220 | int ret; | |
221 | ||
222 | no_addr = rpf = 0; | |
223 | rcu_read_lock(); | |
e5ed6399 | 224 | in_dev = __in_dev_get_rcu(dev); |
1da177e4 LT |
225 | if (in_dev) { |
226 | no_addr = in_dev->ifa_list == NULL; | |
227 | rpf = IN_DEV_RPFILTER(in_dev); | |
228 | } | |
229 | rcu_read_unlock(); | |
230 | ||
231 | if (in_dev == NULL) | |
232 | goto e_inval; | |
233 | ||
234 | if (fib_lookup(&fl, &res)) | |
235 | goto last_resort; | |
236 | if (res.type != RTN_UNICAST) | |
237 | goto e_inval_res; | |
238 | *spec_dst = FIB_RES_PREFSRC(res); | |
239 | fib_combine_itag(itag, &res); | |
240 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
241 | if (FIB_RES_DEV(res) == dev || res.fi->fib_nhs > 1) | |
242 | #else | |
243 | if (FIB_RES_DEV(res) == dev) | |
244 | #endif | |
245 | { | |
246 | ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST; | |
247 | fib_res_put(&res); | |
248 | return ret; | |
249 | } | |
250 | fib_res_put(&res); | |
251 | if (no_addr) | |
252 | goto last_resort; | |
253 | if (rpf) | |
254 | goto e_inval; | |
255 | fl.oif = dev->ifindex; | |
256 | ||
257 | ret = 0; | |
258 | if (fib_lookup(&fl, &res) == 0) { | |
259 | if (res.type == RTN_UNICAST) { | |
260 | *spec_dst = FIB_RES_PREFSRC(res); | |
261 | ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST; | |
262 | } | |
263 | fib_res_put(&res); | |
264 | } | |
265 | return ret; | |
266 | ||
267 | last_resort: | |
268 | if (rpf) | |
269 | goto e_inval; | |
270 | *spec_dst = inet_select_addr(dev, 0, RT_SCOPE_UNIVERSE); | |
271 | *itag = 0; | |
272 | return 0; | |
273 | ||
274 | e_inval_res: | |
275 | fib_res_put(&res); | |
276 | e_inval: | |
277 | return -EINVAL; | |
278 | } | |
279 | ||
81f7bf6c | 280 | static inline __be32 sk_extract_addr(struct sockaddr *addr) |
4e902c57 TG |
281 | { |
282 | return ((struct sockaddr_in *) addr)->sin_addr.s_addr; | |
283 | } | |
284 | ||
285 | static int put_rtax(struct nlattr *mx, int len, int type, u32 value) | |
286 | { | |
287 | struct nlattr *nla; | |
288 | ||
289 | nla = (struct nlattr *) ((char *) mx + len); | |
290 | nla->nla_type = type; | |
291 | nla->nla_len = nla_attr_size(4); | |
292 | *(u32 *) nla_data(nla) = value; | |
293 | ||
294 | return len + nla_total_size(4); | |
295 | } | |
296 | ||
297 | static int rtentry_to_fib_config(int cmd, struct rtentry *rt, | |
298 | struct fib_config *cfg) | |
299 | { | |
6d85c10a | 300 | __be32 addr; |
4e902c57 TG |
301 | int plen; |
302 | ||
303 | memset(cfg, 0, sizeof(*cfg)); | |
304 | ||
305 | if (rt->rt_dst.sa_family != AF_INET) | |
306 | return -EAFNOSUPPORT; | |
307 | ||
308 | /* | |
309 | * Check mask for validity: | |
310 | * a) it must be contiguous. | |
311 | * b) destination must have all host bits clear. | |
312 | * c) if application forgot to set correct family (AF_INET), | |
313 | * reject request unless it is absolutely clear i.e. | |
314 | * both family and mask are zero. | |
315 | */ | |
316 | plen = 32; | |
317 | addr = sk_extract_addr(&rt->rt_dst); | |
318 | if (!(rt->rt_flags & RTF_HOST)) { | |
81f7bf6c | 319 | __be32 mask = sk_extract_addr(&rt->rt_genmask); |
4e902c57 TG |
320 | |
321 | if (rt->rt_genmask.sa_family != AF_INET) { | |
322 | if (mask || rt->rt_genmask.sa_family) | |
323 | return -EAFNOSUPPORT; | |
324 | } | |
325 | ||
326 | if (bad_mask(mask, addr)) | |
327 | return -EINVAL; | |
328 | ||
329 | plen = inet_mask_len(mask); | |
330 | } | |
331 | ||
332 | cfg->fc_dst_len = plen; | |
333 | cfg->fc_dst = addr; | |
334 | ||
335 | if (cmd != SIOCDELRT) { | |
336 | cfg->fc_nlflags = NLM_F_CREATE; | |
337 | cfg->fc_protocol = RTPROT_BOOT; | |
338 | } | |
339 | ||
340 | if (rt->rt_metric) | |
341 | cfg->fc_priority = rt->rt_metric - 1; | |
342 | ||
343 | if (rt->rt_flags & RTF_REJECT) { | |
344 | cfg->fc_scope = RT_SCOPE_HOST; | |
345 | cfg->fc_type = RTN_UNREACHABLE; | |
346 | return 0; | |
347 | } | |
348 | ||
349 | cfg->fc_scope = RT_SCOPE_NOWHERE; | |
350 | cfg->fc_type = RTN_UNICAST; | |
351 | ||
352 | if (rt->rt_dev) { | |
353 | char *colon; | |
354 | struct net_device *dev; | |
355 | char devname[IFNAMSIZ]; | |
356 | ||
357 | if (copy_from_user(devname, rt->rt_dev, IFNAMSIZ-1)) | |
358 | return -EFAULT; | |
359 | ||
360 | devname[IFNAMSIZ-1] = 0; | |
361 | colon = strchr(devname, ':'); | |
362 | if (colon) | |
363 | *colon = 0; | |
881d966b | 364 | dev = __dev_get_by_name(&init_net, devname); |
4e902c57 TG |
365 | if (!dev) |
366 | return -ENODEV; | |
367 | cfg->fc_oif = dev->ifindex; | |
368 | if (colon) { | |
369 | struct in_ifaddr *ifa; | |
370 | struct in_device *in_dev = __in_dev_get_rtnl(dev); | |
371 | if (!in_dev) | |
372 | return -ENODEV; | |
373 | *colon = ':'; | |
374 | for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) | |
375 | if (strcmp(ifa->ifa_label, devname) == 0) | |
376 | break; | |
377 | if (ifa == NULL) | |
378 | return -ENODEV; | |
379 | cfg->fc_prefsrc = ifa->ifa_local; | |
380 | } | |
381 | } | |
382 | ||
383 | addr = sk_extract_addr(&rt->rt_gateway); | |
384 | if (rt->rt_gateway.sa_family == AF_INET && addr) { | |
385 | cfg->fc_gw = addr; | |
386 | if (rt->rt_flags & RTF_GATEWAY && | |
387 | inet_addr_type(addr) == RTN_UNICAST) | |
388 | cfg->fc_scope = RT_SCOPE_UNIVERSE; | |
389 | } | |
390 | ||
391 | if (cmd == SIOCDELRT) | |
392 | return 0; | |
393 | ||
394 | if (rt->rt_flags & RTF_GATEWAY && !cfg->fc_gw) | |
395 | return -EINVAL; | |
396 | ||
397 | if (cfg->fc_scope == RT_SCOPE_NOWHERE) | |
398 | cfg->fc_scope = RT_SCOPE_LINK; | |
399 | ||
400 | if (rt->rt_flags & (RTF_MTU | RTF_WINDOW | RTF_IRTT)) { | |
401 | struct nlattr *mx; | |
402 | int len = 0; | |
403 | ||
404 | mx = kzalloc(3 * nla_total_size(4), GFP_KERNEL); | |
e905a9ed | 405 | if (mx == NULL) |
4e902c57 TG |
406 | return -ENOMEM; |
407 | ||
408 | if (rt->rt_flags & RTF_MTU) | |
409 | len = put_rtax(mx, len, RTAX_ADVMSS, rt->rt_mtu - 40); | |
410 | ||
411 | if (rt->rt_flags & RTF_WINDOW) | |
412 | len = put_rtax(mx, len, RTAX_WINDOW, rt->rt_window); | |
413 | ||
414 | if (rt->rt_flags & RTF_IRTT) | |
415 | len = put_rtax(mx, len, RTAX_RTT, rt->rt_irtt << 3); | |
416 | ||
417 | cfg->fc_mx = mx; | |
418 | cfg->fc_mx_len = len; | |
419 | } | |
420 | ||
421 | return 0; | |
422 | } | |
423 | ||
1da177e4 LT |
424 | /* |
425 | * Handle IP routing ioctl calls. These are used to manipulate the routing tables | |
426 | */ | |
e905a9ed | 427 | |
1da177e4 LT |
428 | int ip_rt_ioctl(unsigned int cmd, void __user *arg) |
429 | { | |
4e902c57 TG |
430 | struct fib_config cfg; |
431 | struct rtentry rt; | |
1da177e4 | 432 | int err; |
1da177e4 LT |
433 | |
434 | switch (cmd) { | |
435 | case SIOCADDRT: /* Add a route */ | |
436 | case SIOCDELRT: /* Delete a route */ | |
437 | if (!capable(CAP_NET_ADMIN)) | |
438 | return -EPERM; | |
4e902c57 TG |
439 | |
440 | if (copy_from_user(&rt, arg, sizeof(rt))) | |
1da177e4 | 441 | return -EFAULT; |
4e902c57 | 442 | |
1da177e4 | 443 | rtnl_lock(); |
4e902c57 | 444 | err = rtentry_to_fib_config(cmd, &rt, &cfg); |
1da177e4 | 445 | if (err == 0) { |
4e902c57 TG |
446 | struct fib_table *tb; |
447 | ||
1da177e4 | 448 | if (cmd == SIOCDELRT) { |
4e902c57 | 449 | tb = fib_get_table(cfg.fc_table); |
1da177e4 | 450 | if (tb) |
4e902c57 TG |
451 | err = tb->tb_delete(tb, &cfg); |
452 | else | |
453 | err = -ESRCH; | |
1da177e4 | 454 | } else { |
4e902c57 | 455 | tb = fib_new_table(cfg.fc_table); |
1da177e4 | 456 | if (tb) |
4e902c57 TG |
457 | err = tb->tb_insert(tb, &cfg); |
458 | else | |
459 | err = -ENOBUFS; | |
1da177e4 | 460 | } |
4e902c57 TG |
461 | |
462 | /* allocated by rtentry_to_fib_config() */ | |
463 | kfree(cfg.fc_mx); | |
1da177e4 LT |
464 | } |
465 | rtnl_unlock(); | |
466 | return err; | |
467 | } | |
468 | return -EINVAL; | |
469 | } | |
470 | ||
ef7c79ed | 471 | const struct nla_policy rtm_ipv4_policy[RTA_MAX+1] = { |
4e902c57 TG |
472 | [RTA_DST] = { .type = NLA_U32 }, |
473 | [RTA_SRC] = { .type = NLA_U32 }, | |
474 | [RTA_IIF] = { .type = NLA_U32 }, | |
475 | [RTA_OIF] = { .type = NLA_U32 }, | |
476 | [RTA_GATEWAY] = { .type = NLA_U32 }, | |
477 | [RTA_PRIORITY] = { .type = NLA_U32 }, | |
478 | [RTA_PREFSRC] = { .type = NLA_U32 }, | |
479 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
5176f91e | 480 | [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) }, |
4e902c57 TG |
481 | [RTA_PROTOINFO] = { .type = NLA_U32 }, |
482 | [RTA_FLOW] = { .type = NLA_U32 }, | |
4e902c57 TG |
483 | }; |
484 | ||
485 | static int rtm_to_fib_config(struct sk_buff *skb, struct nlmsghdr *nlh, | |
486 | struct fib_config *cfg) | |
1da177e4 | 487 | { |
4e902c57 TG |
488 | struct nlattr *attr; |
489 | int err, remaining; | |
490 | struct rtmsg *rtm; | |
491 | ||
492 | err = nlmsg_validate(nlh, sizeof(*rtm), RTA_MAX, rtm_ipv4_policy); | |
493 | if (err < 0) | |
494 | goto errout; | |
495 | ||
496 | memset(cfg, 0, sizeof(*cfg)); | |
497 | ||
498 | rtm = nlmsg_data(nlh); | |
4e902c57 | 499 | cfg->fc_dst_len = rtm->rtm_dst_len; |
4e902c57 TG |
500 | cfg->fc_tos = rtm->rtm_tos; |
501 | cfg->fc_table = rtm->rtm_table; | |
502 | cfg->fc_protocol = rtm->rtm_protocol; | |
503 | cfg->fc_scope = rtm->rtm_scope; | |
504 | cfg->fc_type = rtm->rtm_type; | |
505 | cfg->fc_flags = rtm->rtm_flags; | |
506 | cfg->fc_nlflags = nlh->nlmsg_flags; | |
507 | ||
508 | cfg->fc_nlinfo.pid = NETLINK_CB(skb).pid; | |
509 | cfg->fc_nlinfo.nlh = nlh; | |
510 | ||
a0ee18b9 TG |
511 | if (cfg->fc_type > RTN_MAX) { |
512 | err = -EINVAL; | |
513 | goto errout; | |
514 | } | |
515 | ||
4e902c57 | 516 | nlmsg_for_each_attr(attr, nlh, sizeof(struct rtmsg), remaining) { |
8f4c1f9b | 517 | switch (nla_type(attr)) { |
4e902c57 | 518 | case RTA_DST: |
17fb2c64 | 519 | cfg->fc_dst = nla_get_be32(attr); |
4e902c57 | 520 | break; |
4e902c57 TG |
521 | case RTA_OIF: |
522 | cfg->fc_oif = nla_get_u32(attr); | |
523 | break; | |
524 | case RTA_GATEWAY: | |
17fb2c64 | 525 | cfg->fc_gw = nla_get_be32(attr); |
4e902c57 TG |
526 | break; |
527 | case RTA_PRIORITY: | |
528 | cfg->fc_priority = nla_get_u32(attr); | |
529 | break; | |
530 | case RTA_PREFSRC: | |
17fb2c64 | 531 | cfg->fc_prefsrc = nla_get_be32(attr); |
4e902c57 TG |
532 | break; |
533 | case RTA_METRICS: | |
534 | cfg->fc_mx = nla_data(attr); | |
535 | cfg->fc_mx_len = nla_len(attr); | |
536 | break; | |
537 | case RTA_MULTIPATH: | |
538 | cfg->fc_mp = nla_data(attr); | |
539 | cfg->fc_mp_len = nla_len(attr); | |
540 | break; | |
541 | case RTA_FLOW: | |
542 | cfg->fc_flow = nla_get_u32(attr); | |
543 | break; | |
4e902c57 TG |
544 | case RTA_TABLE: |
545 | cfg->fc_table = nla_get_u32(attr); | |
546 | break; | |
1da177e4 LT |
547 | } |
548 | } | |
4e902c57 | 549 | |
1da177e4 | 550 | return 0; |
4e902c57 TG |
551 | errout: |
552 | return err; | |
1da177e4 LT |
553 | } |
554 | ||
63f3444f | 555 | static int inet_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 556 | { |
b854272b | 557 | struct net *net = skb->sk->sk_net; |
4e902c57 TG |
558 | struct fib_config cfg; |
559 | struct fib_table *tb; | |
560 | int err; | |
1da177e4 | 561 | |
b854272b DL |
562 | if (net != &init_net) |
563 | return -EINVAL; | |
564 | ||
4e902c57 TG |
565 | err = rtm_to_fib_config(skb, nlh, &cfg); |
566 | if (err < 0) | |
567 | goto errout; | |
1da177e4 | 568 | |
4e902c57 TG |
569 | tb = fib_get_table(cfg.fc_table); |
570 | if (tb == NULL) { | |
571 | err = -ESRCH; | |
572 | goto errout; | |
573 | } | |
574 | ||
575 | err = tb->tb_delete(tb, &cfg); | |
576 | errout: | |
577 | return err; | |
1da177e4 LT |
578 | } |
579 | ||
63f3444f | 580 | static int inet_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 581 | { |
b854272b | 582 | struct net *net = skb->sk->sk_net; |
4e902c57 TG |
583 | struct fib_config cfg; |
584 | struct fib_table *tb; | |
585 | int err; | |
1da177e4 | 586 | |
b854272b DL |
587 | if (net != &init_net) |
588 | return -EINVAL; | |
589 | ||
4e902c57 TG |
590 | err = rtm_to_fib_config(skb, nlh, &cfg); |
591 | if (err < 0) | |
592 | goto errout; | |
1da177e4 | 593 | |
4e902c57 TG |
594 | tb = fib_new_table(cfg.fc_table); |
595 | if (tb == NULL) { | |
596 | err = -ENOBUFS; | |
597 | goto errout; | |
598 | } | |
599 | ||
600 | err = tb->tb_insert(tb, &cfg); | |
601 | errout: | |
602 | return err; | |
1da177e4 LT |
603 | } |
604 | ||
63f3444f | 605 | static int inet_dump_fib(struct sk_buff *skb, struct netlink_callback *cb) |
1da177e4 | 606 | { |
b854272b | 607 | struct net *net = skb->sk->sk_net; |
1af5a8c4 PM |
608 | unsigned int h, s_h; |
609 | unsigned int e = 0, s_e; | |
1da177e4 | 610 | struct fib_table *tb; |
1af5a8c4 PM |
611 | struct hlist_node *node; |
612 | int dumped = 0; | |
1da177e4 | 613 | |
b854272b DL |
614 | if (net != &init_net) |
615 | return 0; | |
616 | ||
be403ea1 TG |
617 | if (nlmsg_len(cb->nlh) >= sizeof(struct rtmsg) && |
618 | ((struct rtmsg *) nlmsg_data(cb->nlh))->rtm_flags & RTM_F_CLONED) | |
1da177e4 LT |
619 | return ip_rt_dump(skb, cb); |
620 | ||
1af5a8c4 PM |
621 | s_h = cb->args[0]; |
622 | s_e = cb->args[1]; | |
623 | ||
624 | for (h = s_h; h < FIB_TABLE_HASHSZ; h++, s_e = 0) { | |
625 | e = 0; | |
626 | hlist_for_each_entry(tb, node, &fib_table_hash[h], tb_hlist) { | |
627 | if (e < s_e) | |
628 | goto next; | |
629 | if (dumped) | |
630 | memset(&cb->args[2], 0, sizeof(cb->args) - | |
e905a9ed | 631 | 2 * sizeof(cb->args[0])); |
1af5a8c4 PM |
632 | if (tb->tb_dump(tb, skb, cb) < 0) |
633 | goto out; | |
634 | dumped = 1; | |
635 | next: | |
636 | e++; | |
637 | } | |
1da177e4 | 638 | } |
1af5a8c4 PM |
639 | out: |
640 | cb->args[1] = e; | |
641 | cb->args[0] = h; | |
1da177e4 LT |
642 | |
643 | return skb->len; | |
644 | } | |
645 | ||
646 | /* Prepare and feed intra-kernel routing request. | |
647 | Really, it should be netlink message, but :-( netlink | |
648 | can be not configured, so that we feed it directly | |
649 | to fib engine. It is legal, because all events occur | |
650 | only when netlink is already locked. | |
651 | */ | |
652 | ||
81f7bf6c | 653 | static void fib_magic(int cmd, int type, __be32 dst, int dst_len, struct in_ifaddr *ifa) |
1da177e4 | 654 | { |
4e902c57 TG |
655 | struct fib_table *tb; |
656 | struct fib_config cfg = { | |
657 | .fc_protocol = RTPROT_KERNEL, | |
658 | .fc_type = type, | |
659 | .fc_dst = dst, | |
660 | .fc_dst_len = dst_len, | |
661 | .fc_prefsrc = ifa->ifa_local, | |
662 | .fc_oif = ifa->ifa_dev->dev->ifindex, | |
663 | .fc_nlflags = NLM_F_CREATE | NLM_F_APPEND, | |
664 | }; | |
1da177e4 LT |
665 | |
666 | if (type == RTN_UNICAST) | |
667 | tb = fib_new_table(RT_TABLE_MAIN); | |
668 | else | |
669 | tb = fib_new_table(RT_TABLE_LOCAL); | |
670 | ||
671 | if (tb == NULL) | |
672 | return; | |
673 | ||
4e902c57 | 674 | cfg.fc_table = tb->tb_id; |
1da177e4 | 675 | |
4e902c57 TG |
676 | if (type != RTN_LOCAL) |
677 | cfg.fc_scope = RT_SCOPE_LINK; | |
678 | else | |
679 | cfg.fc_scope = RT_SCOPE_HOST; | |
1da177e4 LT |
680 | |
681 | if (cmd == RTM_NEWROUTE) | |
4e902c57 | 682 | tb->tb_insert(tb, &cfg); |
1da177e4 | 683 | else |
4e902c57 | 684 | tb->tb_delete(tb, &cfg); |
1da177e4 LT |
685 | } |
686 | ||
0ff60a45 | 687 | void fib_add_ifaddr(struct in_ifaddr *ifa) |
1da177e4 LT |
688 | { |
689 | struct in_device *in_dev = ifa->ifa_dev; | |
690 | struct net_device *dev = in_dev->dev; | |
691 | struct in_ifaddr *prim = ifa; | |
a144ea4b AV |
692 | __be32 mask = ifa->ifa_mask; |
693 | __be32 addr = ifa->ifa_local; | |
694 | __be32 prefix = ifa->ifa_address&mask; | |
1da177e4 LT |
695 | |
696 | if (ifa->ifa_flags&IFA_F_SECONDARY) { | |
697 | prim = inet_ifa_byprefix(in_dev, prefix, mask); | |
698 | if (prim == NULL) { | |
699 | printk(KERN_DEBUG "fib_add_ifaddr: bug: prim == NULL\n"); | |
700 | return; | |
701 | } | |
702 | } | |
703 | ||
704 | fib_magic(RTM_NEWROUTE, RTN_LOCAL, addr, 32, prim); | |
705 | ||
706 | if (!(dev->flags&IFF_UP)) | |
707 | return; | |
708 | ||
709 | /* Add broadcast address, if it is explicitly assigned. */ | |
a144ea4b | 710 | if (ifa->ifa_broadcast && ifa->ifa_broadcast != htonl(0xFFFFFFFF)) |
1da177e4 LT |
711 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim); |
712 | ||
f97c1e0c | 713 | if (!ipv4_is_zeronet(prefix) && !(ifa->ifa_flags&IFA_F_SECONDARY) && |
1da177e4 LT |
714 | (prefix != addr || ifa->ifa_prefixlen < 32)) { |
715 | fib_magic(RTM_NEWROUTE, dev->flags&IFF_LOOPBACK ? RTN_LOCAL : | |
716 | RTN_UNICAST, prefix, ifa->ifa_prefixlen, prim); | |
717 | ||
718 | /* Add network specific broadcasts, when it takes a sense */ | |
719 | if (ifa->ifa_prefixlen < 31) { | |
720 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix, 32, prim); | |
721 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix|~mask, 32, prim); | |
722 | } | |
723 | } | |
724 | } | |
725 | ||
726 | static void fib_del_ifaddr(struct in_ifaddr *ifa) | |
727 | { | |
728 | struct in_device *in_dev = ifa->ifa_dev; | |
729 | struct net_device *dev = in_dev->dev; | |
730 | struct in_ifaddr *ifa1; | |
731 | struct in_ifaddr *prim = ifa; | |
a144ea4b AV |
732 | __be32 brd = ifa->ifa_address|~ifa->ifa_mask; |
733 | __be32 any = ifa->ifa_address&ifa->ifa_mask; | |
1da177e4 LT |
734 | #define LOCAL_OK 1 |
735 | #define BRD_OK 2 | |
736 | #define BRD0_OK 4 | |
737 | #define BRD1_OK 8 | |
738 | unsigned ok = 0; | |
739 | ||
740 | if (!(ifa->ifa_flags&IFA_F_SECONDARY)) | |
741 | fib_magic(RTM_DELROUTE, dev->flags&IFF_LOOPBACK ? RTN_LOCAL : | |
742 | RTN_UNICAST, any, ifa->ifa_prefixlen, prim); | |
743 | else { | |
744 | prim = inet_ifa_byprefix(in_dev, any, ifa->ifa_mask); | |
745 | if (prim == NULL) { | |
746 | printk(KERN_DEBUG "fib_del_ifaddr: bug: prim == NULL\n"); | |
747 | return; | |
748 | } | |
749 | } | |
750 | ||
751 | /* Deletion is more complicated than add. | |
752 | We should take care of not to delete too much :-) | |
753 | ||
754 | Scan address list to be sure that addresses are really gone. | |
755 | */ | |
756 | ||
757 | for (ifa1 = in_dev->ifa_list; ifa1; ifa1 = ifa1->ifa_next) { | |
758 | if (ifa->ifa_local == ifa1->ifa_local) | |
759 | ok |= LOCAL_OK; | |
760 | if (ifa->ifa_broadcast == ifa1->ifa_broadcast) | |
761 | ok |= BRD_OK; | |
762 | if (brd == ifa1->ifa_broadcast) | |
763 | ok |= BRD1_OK; | |
764 | if (any == ifa1->ifa_broadcast) | |
765 | ok |= BRD0_OK; | |
766 | } | |
767 | ||
768 | if (!(ok&BRD_OK)) | |
769 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim); | |
770 | if (!(ok&BRD1_OK)) | |
771 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, brd, 32, prim); | |
772 | if (!(ok&BRD0_OK)) | |
773 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, any, 32, prim); | |
774 | if (!(ok&LOCAL_OK)) { | |
775 | fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 32, prim); | |
776 | ||
777 | /* Check, that this local address finally disappeared. */ | |
778 | if (inet_addr_type(ifa->ifa_local) != RTN_LOCAL) { | |
779 | /* And the last, but not the least thing. | |
780 | We must flush stray FIB entries. | |
781 | ||
782 | First of all, we scan fib_info list searching | |
783 | for stray nexthop entries, then ignite fib_flush. | |
784 | */ | |
785 | if (fib_sync_down(ifa->ifa_local, NULL, 0)) | |
786 | fib_flush(); | |
787 | } | |
788 | } | |
789 | #undef LOCAL_OK | |
790 | #undef BRD_OK | |
791 | #undef BRD0_OK | |
792 | #undef BRD1_OK | |
793 | } | |
794 | ||
246955fe RO |
795 | static void nl_fib_lookup(struct fib_result_nl *frn, struct fib_table *tb ) |
796 | { | |
e905a9ed | 797 | |
246955fe | 798 | struct fib_result res; |
5f300893 | 799 | struct flowi fl = { .mark = frn->fl_mark, |
47dcf0cb | 800 | .nl_u = { .ip4_u = { .daddr = frn->fl_addr, |
246955fe RO |
801 | .tos = frn->fl_tos, |
802 | .scope = frn->fl_scope } } }; | |
1194ed0a | 803 | |
912a41a4 SV |
804 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
805 | res.r = NULL; | |
806 | #endif | |
807 | ||
1194ed0a | 808 | frn->err = -ENOENT; |
246955fe RO |
809 | if (tb) { |
810 | local_bh_disable(); | |
811 | ||
812 | frn->tb_id = tb->tb_id; | |
813 | frn->err = tb->tb_lookup(tb, &fl, &res); | |
814 | ||
815 | if (!frn->err) { | |
816 | frn->prefixlen = res.prefixlen; | |
817 | frn->nh_sel = res.nh_sel; | |
818 | frn->type = res.type; | |
819 | frn->scope = res.scope; | |
1194ed0a | 820 | fib_res_put(&res); |
246955fe RO |
821 | } |
822 | local_bh_enable(); | |
823 | } | |
824 | } | |
825 | ||
28f7b036 | 826 | static void nl_fib_input(struct sk_buff *skb) |
246955fe | 827 | { |
246955fe | 828 | struct fib_result_nl *frn; |
28f7b036 | 829 | struct nlmsghdr *nlh; |
246955fe | 830 | struct fib_table *tb; |
28f7b036 | 831 | u32 pid; |
1194ed0a | 832 | |
b529ccf2 | 833 | nlh = nlmsg_hdr(skb); |
ea86575e | 834 | if (skb->len < NLMSG_SPACE(0) || skb->len < nlh->nlmsg_len || |
d883a036 | 835 | nlh->nlmsg_len < NLMSG_LENGTH(sizeof(*frn))) |
ea86575e | 836 | return; |
d883a036 DL |
837 | |
838 | skb = skb_clone(skb, GFP_KERNEL); | |
839 | if (skb == NULL) | |
840 | return; | |
841 | nlh = nlmsg_hdr(skb); | |
e905a9ed | 842 | |
246955fe RO |
843 | frn = (struct fib_result_nl *) NLMSG_DATA(nlh); |
844 | tb = fib_get_table(frn->tb_id_in); | |
845 | ||
846 | nl_fib_lookup(frn, tb); | |
e905a9ed | 847 | |
1194ed0a | 848 | pid = NETLINK_CB(skb).pid; /* pid of sending process */ |
246955fe | 849 | NETLINK_CB(skb).pid = 0; /* from kernel */ |
ac6d439d | 850 | NETLINK_CB(skb).dst_group = 0; /* unicast */ |
cd40b7d3 | 851 | netlink_unicast(fibnl, skb, pid, MSG_DONTWAIT); |
e905a9ed | 852 | } |
246955fe RO |
853 | |
854 | static void nl_fib_lookup_init(void) | |
855 | { | |
cd40b7d3 DL |
856 | fibnl = netlink_kernel_create(&init_net, NETLINK_FIB_LOOKUP, 0, |
857 | nl_fib_input, NULL, THIS_MODULE); | |
246955fe RO |
858 | } |
859 | ||
1da177e4 LT |
860 | static void fib_disable_ip(struct net_device *dev, int force) |
861 | { | |
862 | if (fib_sync_down(0, dev, force)) | |
863 | fib_flush(); | |
864 | rt_cache_flush(0); | |
865 | arp_ifdown(dev); | |
866 | } | |
867 | ||
868 | static int fib_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr) | |
869 | { | |
870 | struct in_ifaddr *ifa = (struct in_ifaddr*)ptr; | |
871 | ||
872 | switch (event) { | |
873 | case NETDEV_UP: | |
874 | fib_add_ifaddr(ifa); | |
875 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
876 | fib_sync_up(ifa->ifa_dev->dev); | |
877 | #endif | |
878 | rt_cache_flush(-1); | |
879 | break; | |
880 | case NETDEV_DOWN: | |
881 | fib_del_ifaddr(ifa); | |
9fcc2e8a | 882 | if (ifa->ifa_dev->ifa_list == NULL) { |
1da177e4 LT |
883 | /* Last address was deleted from this interface. |
884 | Disable IP. | |
885 | */ | |
886 | fib_disable_ip(ifa->ifa_dev->dev, 1); | |
887 | } else { | |
888 | rt_cache_flush(-1); | |
889 | } | |
890 | break; | |
891 | } | |
892 | return NOTIFY_DONE; | |
893 | } | |
894 | ||
895 | static int fib_netdev_event(struct notifier_block *this, unsigned long event, void *ptr) | |
896 | { | |
897 | struct net_device *dev = ptr; | |
e5ed6399 | 898 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
1da177e4 | 899 | |
e9dc8653 EB |
900 | if (dev->nd_net != &init_net) |
901 | return NOTIFY_DONE; | |
902 | ||
1da177e4 LT |
903 | if (event == NETDEV_UNREGISTER) { |
904 | fib_disable_ip(dev, 2); | |
905 | return NOTIFY_DONE; | |
906 | } | |
907 | ||
908 | if (!in_dev) | |
909 | return NOTIFY_DONE; | |
910 | ||
911 | switch (event) { | |
912 | case NETDEV_UP: | |
913 | for_ifa(in_dev) { | |
914 | fib_add_ifaddr(ifa); | |
915 | } endfor_ifa(in_dev); | |
916 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
917 | fib_sync_up(dev); | |
918 | #endif | |
919 | rt_cache_flush(-1); | |
920 | break; | |
921 | case NETDEV_DOWN: | |
922 | fib_disable_ip(dev, 0); | |
923 | break; | |
924 | case NETDEV_CHANGEMTU: | |
925 | case NETDEV_CHANGE: | |
926 | rt_cache_flush(0); | |
927 | break; | |
928 | } | |
929 | return NOTIFY_DONE; | |
930 | } | |
931 | ||
932 | static struct notifier_block fib_inetaddr_notifier = { | |
933 | .notifier_call =fib_inetaddr_event, | |
934 | }; | |
935 | ||
936 | static struct notifier_block fib_netdev_notifier = { | |
937 | .notifier_call =fib_netdev_event, | |
938 | }; | |
939 | ||
940 | void __init ip_fib_init(void) | |
941 | { | |
1af5a8c4 PM |
942 | unsigned int i; |
943 | ||
944 | for (i = 0; i < FIB_TABLE_HASHSZ; i++) | |
945 | INIT_HLIST_HEAD(&fib_table_hash[i]); | |
c3e9a353 | 946 | |
e1ef4bf2 | 947 | fib4_rules_init(); |
1da177e4 LT |
948 | |
949 | register_netdevice_notifier(&fib_netdev_notifier); | |
950 | register_inetaddr_notifier(&fib_inetaddr_notifier); | |
246955fe | 951 | nl_fib_lookup_init(); |
63f3444f TG |
952 | |
953 | rtnl_register(PF_INET, RTM_NEWROUTE, inet_rtm_newroute, NULL); | |
954 | rtnl_register(PF_INET, RTM_DELROUTE, inet_rtm_delroute, NULL); | |
955 | rtnl_register(PF_INET, RTM_GETROUTE, NULL, inet_dump_fib); | |
1da177e4 LT |
956 | } |
957 | ||
958 | EXPORT_SYMBOL(inet_addr_type); | |
05538116 | 959 | EXPORT_SYMBOL(inet_dev_addr_type); |
a1e8733e | 960 | EXPORT_SYMBOL(ip_dev_find); |