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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 | ||
fd683222 | 158 | unsigned inet_addr_type(__be32 addr) |
1da177e4 LT |
159 | { |
160 | struct flowi fl = { .nl_u = { .ip4_u = { .daddr = addr } } }; | |
161 | struct fib_result res; | |
162 | unsigned ret = RTN_BROADCAST; | |
03cf786c | 163 | struct fib_table *local_table; |
1da177e4 LT |
164 | |
165 | if (ZERONET(addr) || BADCLASS(addr)) | |
166 | return RTN_BROADCAST; | |
167 | if (MULTICAST(addr)) | |
168 | return RTN_MULTICAST; | |
169 | ||
170 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
171 | res.r = NULL; | |
172 | #endif | |
e905a9ed | 173 | |
03cf786c PE |
174 | local_table = fib_get_table(RT_TABLE_LOCAL); |
175 | if (local_table) { | |
1da177e4 | 176 | ret = RTN_UNICAST; |
03cf786c | 177 | if (!local_table->tb_lookup(local_table, &fl, &res)) { |
1da177e4 LT |
178 | ret = res.type; |
179 | fib_res_put(&res); | |
180 | } | |
181 | } | |
182 | return ret; | |
183 | } | |
184 | ||
185 | /* Given (packet source, input interface) and optional (dst, oif, tos): | |
186 | - (main) check, that source is valid i.e. not broadcast or our local | |
187 | address. | |
188 | - figure out what "logical" interface this packet arrived | |
189 | and calculate "specific destination" address. | |
190 | - check, that packet arrived from expected physical interface. | |
191 | */ | |
192 | ||
d9c9df8c AV |
193 | int fib_validate_source(__be32 src, __be32 dst, u8 tos, int oif, |
194 | struct net_device *dev, __be32 *spec_dst, u32 *itag) | |
1da177e4 LT |
195 | { |
196 | struct in_device *in_dev; | |
197 | struct flowi fl = { .nl_u = { .ip4_u = | |
198 | { .daddr = src, | |
199 | .saddr = dst, | |
200 | .tos = tos } }, | |
201 | .iif = oif }; | |
202 | struct fib_result res; | |
203 | int no_addr, rpf; | |
204 | int ret; | |
205 | ||
206 | no_addr = rpf = 0; | |
207 | rcu_read_lock(); | |
e5ed6399 | 208 | in_dev = __in_dev_get_rcu(dev); |
1da177e4 LT |
209 | if (in_dev) { |
210 | no_addr = in_dev->ifa_list == NULL; | |
211 | rpf = IN_DEV_RPFILTER(in_dev); | |
212 | } | |
213 | rcu_read_unlock(); | |
214 | ||
215 | if (in_dev == NULL) | |
216 | goto e_inval; | |
217 | ||
218 | if (fib_lookup(&fl, &res)) | |
219 | goto last_resort; | |
220 | if (res.type != RTN_UNICAST) | |
221 | goto e_inval_res; | |
222 | *spec_dst = FIB_RES_PREFSRC(res); | |
223 | fib_combine_itag(itag, &res); | |
224 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
225 | if (FIB_RES_DEV(res) == dev || res.fi->fib_nhs > 1) | |
226 | #else | |
227 | if (FIB_RES_DEV(res) == dev) | |
228 | #endif | |
229 | { | |
230 | ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST; | |
231 | fib_res_put(&res); | |
232 | return ret; | |
233 | } | |
234 | fib_res_put(&res); | |
235 | if (no_addr) | |
236 | goto last_resort; | |
237 | if (rpf) | |
238 | goto e_inval; | |
239 | fl.oif = dev->ifindex; | |
240 | ||
241 | ret = 0; | |
242 | if (fib_lookup(&fl, &res) == 0) { | |
243 | if (res.type == RTN_UNICAST) { | |
244 | *spec_dst = FIB_RES_PREFSRC(res); | |
245 | ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST; | |
246 | } | |
247 | fib_res_put(&res); | |
248 | } | |
249 | return ret; | |
250 | ||
251 | last_resort: | |
252 | if (rpf) | |
253 | goto e_inval; | |
254 | *spec_dst = inet_select_addr(dev, 0, RT_SCOPE_UNIVERSE); | |
255 | *itag = 0; | |
256 | return 0; | |
257 | ||
258 | e_inval_res: | |
259 | fib_res_put(&res); | |
260 | e_inval: | |
261 | return -EINVAL; | |
262 | } | |
263 | ||
81f7bf6c | 264 | static inline __be32 sk_extract_addr(struct sockaddr *addr) |
4e902c57 TG |
265 | { |
266 | return ((struct sockaddr_in *) addr)->sin_addr.s_addr; | |
267 | } | |
268 | ||
269 | static int put_rtax(struct nlattr *mx, int len, int type, u32 value) | |
270 | { | |
271 | struct nlattr *nla; | |
272 | ||
273 | nla = (struct nlattr *) ((char *) mx + len); | |
274 | nla->nla_type = type; | |
275 | nla->nla_len = nla_attr_size(4); | |
276 | *(u32 *) nla_data(nla) = value; | |
277 | ||
278 | return len + nla_total_size(4); | |
279 | } | |
280 | ||
281 | static int rtentry_to_fib_config(int cmd, struct rtentry *rt, | |
282 | struct fib_config *cfg) | |
283 | { | |
6d85c10a | 284 | __be32 addr; |
4e902c57 TG |
285 | int plen; |
286 | ||
287 | memset(cfg, 0, sizeof(*cfg)); | |
288 | ||
289 | if (rt->rt_dst.sa_family != AF_INET) | |
290 | return -EAFNOSUPPORT; | |
291 | ||
292 | /* | |
293 | * Check mask for validity: | |
294 | * a) it must be contiguous. | |
295 | * b) destination must have all host bits clear. | |
296 | * c) if application forgot to set correct family (AF_INET), | |
297 | * reject request unless it is absolutely clear i.e. | |
298 | * both family and mask are zero. | |
299 | */ | |
300 | plen = 32; | |
301 | addr = sk_extract_addr(&rt->rt_dst); | |
302 | if (!(rt->rt_flags & RTF_HOST)) { | |
81f7bf6c | 303 | __be32 mask = sk_extract_addr(&rt->rt_genmask); |
4e902c57 TG |
304 | |
305 | if (rt->rt_genmask.sa_family != AF_INET) { | |
306 | if (mask || rt->rt_genmask.sa_family) | |
307 | return -EAFNOSUPPORT; | |
308 | } | |
309 | ||
310 | if (bad_mask(mask, addr)) | |
311 | return -EINVAL; | |
312 | ||
313 | plen = inet_mask_len(mask); | |
314 | } | |
315 | ||
316 | cfg->fc_dst_len = plen; | |
317 | cfg->fc_dst = addr; | |
318 | ||
319 | if (cmd != SIOCDELRT) { | |
320 | cfg->fc_nlflags = NLM_F_CREATE; | |
321 | cfg->fc_protocol = RTPROT_BOOT; | |
322 | } | |
323 | ||
324 | if (rt->rt_metric) | |
325 | cfg->fc_priority = rt->rt_metric - 1; | |
326 | ||
327 | if (rt->rt_flags & RTF_REJECT) { | |
328 | cfg->fc_scope = RT_SCOPE_HOST; | |
329 | cfg->fc_type = RTN_UNREACHABLE; | |
330 | return 0; | |
331 | } | |
332 | ||
333 | cfg->fc_scope = RT_SCOPE_NOWHERE; | |
334 | cfg->fc_type = RTN_UNICAST; | |
335 | ||
336 | if (rt->rt_dev) { | |
337 | char *colon; | |
338 | struct net_device *dev; | |
339 | char devname[IFNAMSIZ]; | |
340 | ||
341 | if (copy_from_user(devname, rt->rt_dev, IFNAMSIZ-1)) | |
342 | return -EFAULT; | |
343 | ||
344 | devname[IFNAMSIZ-1] = 0; | |
345 | colon = strchr(devname, ':'); | |
346 | if (colon) | |
347 | *colon = 0; | |
881d966b | 348 | dev = __dev_get_by_name(&init_net, devname); |
4e902c57 TG |
349 | if (!dev) |
350 | return -ENODEV; | |
351 | cfg->fc_oif = dev->ifindex; | |
352 | if (colon) { | |
353 | struct in_ifaddr *ifa; | |
354 | struct in_device *in_dev = __in_dev_get_rtnl(dev); | |
355 | if (!in_dev) | |
356 | return -ENODEV; | |
357 | *colon = ':'; | |
358 | for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) | |
359 | if (strcmp(ifa->ifa_label, devname) == 0) | |
360 | break; | |
361 | if (ifa == NULL) | |
362 | return -ENODEV; | |
363 | cfg->fc_prefsrc = ifa->ifa_local; | |
364 | } | |
365 | } | |
366 | ||
367 | addr = sk_extract_addr(&rt->rt_gateway); | |
368 | if (rt->rt_gateway.sa_family == AF_INET && addr) { | |
369 | cfg->fc_gw = addr; | |
370 | if (rt->rt_flags & RTF_GATEWAY && | |
371 | inet_addr_type(addr) == RTN_UNICAST) | |
372 | cfg->fc_scope = RT_SCOPE_UNIVERSE; | |
373 | } | |
374 | ||
375 | if (cmd == SIOCDELRT) | |
376 | return 0; | |
377 | ||
378 | if (rt->rt_flags & RTF_GATEWAY && !cfg->fc_gw) | |
379 | return -EINVAL; | |
380 | ||
381 | if (cfg->fc_scope == RT_SCOPE_NOWHERE) | |
382 | cfg->fc_scope = RT_SCOPE_LINK; | |
383 | ||
384 | if (rt->rt_flags & (RTF_MTU | RTF_WINDOW | RTF_IRTT)) { | |
385 | struct nlattr *mx; | |
386 | int len = 0; | |
387 | ||
388 | mx = kzalloc(3 * nla_total_size(4), GFP_KERNEL); | |
e905a9ed | 389 | if (mx == NULL) |
4e902c57 TG |
390 | return -ENOMEM; |
391 | ||
392 | if (rt->rt_flags & RTF_MTU) | |
393 | len = put_rtax(mx, len, RTAX_ADVMSS, rt->rt_mtu - 40); | |
394 | ||
395 | if (rt->rt_flags & RTF_WINDOW) | |
396 | len = put_rtax(mx, len, RTAX_WINDOW, rt->rt_window); | |
397 | ||
398 | if (rt->rt_flags & RTF_IRTT) | |
399 | len = put_rtax(mx, len, RTAX_RTT, rt->rt_irtt << 3); | |
400 | ||
401 | cfg->fc_mx = mx; | |
402 | cfg->fc_mx_len = len; | |
403 | } | |
404 | ||
405 | return 0; | |
406 | } | |
407 | ||
1da177e4 LT |
408 | /* |
409 | * Handle IP routing ioctl calls. These are used to manipulate the routing tables | |
410 | */ | |
e905a9ed | 411 | |
1da177e4 LT |
412 | int ip_rt_ioctl(unsigned int cmd, void __user *arg) |
413 | { | |
4e902c57 TG |
414 | struct fib_config cfg; |
415 | struct rtentry rt; | |
1da177e4 | 416 | int err; |
1da177e4 LT |
417 | |
418 | switch (cmd) { | |
419 | case SIOCADDRT: /* Add a route */ | |
420 | case SIOCDELRT: /* Delete a route */ | |
421 | if (!capable(CAP_NET_ADMIN)) | |
422 | return -EPERM; | |
4e902c57 TG |
423 | |
424 | if (copy_from_user(&rt, arg, sizeof(rt))) | |
1da177e4 | 425 | return -EFAULT; |
4e902c57 | 426 | |
1da177e4 | 427 | rtnl_lock(); |
4e902c57 | 428 | err = rtentry_to_fib_config(cmd, &rt, &cfg); |
1da177e4 | 429 | if (err == 0) { |
4e902c57 TG |
430 | struct fib_table *tb; |
431 | ||
1da177e4 | 432 | if (cmd == SIOCDELRT) { |
4e902c57 | 433 | tb = fib_get_table(cfg.fc_table); |
1da177e4 | 434 | if (tb) |
4e902c57 TG |
435 | err = tb->tb_delete(tb, &cfg); |
436 | else | |
437 | err = -ESRCH; | |
1da177e4 | 438 | } else { |
4e902c57 | 439 | tb = fib_new_table(cfg.fc_table); |
1da177e4 | 440 | if (tb) |
4e902c57 TG |
441 | err = tb->tb_insert(tb, &cfg); |
442 | else | |
443 | err = -ENOBUFS; | |
1da177e4 | 444 | } |
4e902c57 TG |
445 | |
446 | /* allocated by rtentry_to_fib_config() */ | |
447 | kfree(cfg.fc_mx); | |
1da177e4 LT |
448 | } |
449 | rtnl_unlock(); | |
450 | return err; | |
451 | } | |
452 | return -EINVAL; | |
453 | } | |
454 | ||
ef7c79ed | 455 | const struct nla_policy rtm_ipv4_policy[RTA_MAX+1] = { |
4e902c57 TG |
456 | [RTA_DST] = { .type = NLA_U32 }, |
457 | [RTA_SRC] = { .type = NLA_U32 }, | |
458 | [RTA_IIF] = { .type = NLA_U32 }, | |
459 | [RTA_OIF] = { .type = NLA_U32 }, | |
460 | [RTA_GATEWAY] = { .type = NLA_U32 }, | |
461 | [RTA_PRIORITY] = { .type = NLA_U32 }, | |
462 | [RTA_PREFSRC] = { .type = NLA_U32 }, | |
463 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
5176f91e | 464 | [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) }, |
4e902c57 TG |
465 | [RTA_PROTOINFO] = { .type = NLA_U32 }, |
466 | [RTA_FLOW] = { .type = NLA_U32 }, | |
4e902c57 TG |
467 | }; |
468 | ||
469 | static int rtm_to_fib_config(struct sk_buff *skb, struct nlmsghdr *nlh, | |
470 | struct fib_config *cfg) | |
1da177e4 | 471 | { |
4e902c57 TG |
472 | struct nlattr *attr; |
473 | int err, remaining; | |
474 | struct rtmsg *rtm; | |
475 | ||
476 | err = nlmsg_validate(nlh, sizeof(*rtm), RTA_MAX, rtm_ipv4_policy); | |
477 | if (err < 0) | |
478 | goto errout; | |
479 | ||
480 | memset(cfg, 0, sizeof(*cfg)); | |
481 | ||
482 | rtm = nlmsg_data(nlh); | |
4e902c57 | 483 | cfg->fc_dst_len = rtm->rtm_dst_len; |
4e902c57 TG |
484 | cfg->fc_tos = rtm->rtm_tos; |
485 | cfg->fc_table = rtm->rtm_table; | |
486 | cfg->fc_protocol = rtm->rtm_protocol; | |
487 | cfg->fc_scope = rtm->rtm_scope; | |
488 | cfg->fc_type = rtm->rtm_type; | |
489 | cfg->fc_flags = rtm->rtm_flags; | |
490 | cfg->fc_nlflags = nlh->nlmsg_flags; | |
491 | ||
492 | cfg->fc_nlinfo.pid = NETLINK_CB(skb).pid; | |
493 | cfg->fc_nlinfo.nlh = nlh; | |
494 | ||
a0ee18b9 TG |
495 | if (cfg->fc_type > RTN_MAX) { |
496 | err = -EINVAL; | |
497 | goto errout; | |
498 | } | |
499 | ||
4e902c57 | 500 | nlmsg_for_each_attr(attr, nlh, sizeof(struct rtmsg), remaining) { |
8f4c1f9b | 501 | switch (nla_type(attr)) { |
4e902c57 | 502 | case RTA_DST: |
17fb2c64 | 503 | cfg->fc_dst = nla_get_be32(attr); |
4e902c57 | 504 | break; |
4e902c57 TG |
505 | case RTA_OIF: |
506 | cfg->fc_oif = nla_get_u32(attr); | |
507 | break; | |
508 | case RTA_GATEWAY: | |
17fb2c64 | 509 | cfg->fc_gw = nla_get_be32(attr); |
4e902c57 TG |
510 | break; |
511 | case RTA_PRIORITY: | |
512 | cfg->fc_priority = nla_get_u32(attr); | |
513 | break; | |
514 | case RTA_PREFSRC: | |
17fb2c64 | 515 | cfg->fc_prefsrc = nla_get_be32(attr); |
4e902c57 TG |
516 | break; |
517 | case RTA_METRICS: | |
518 | cfg->fc_mx = nla_data(attr); | |
519 | cfg->fc_mx_len = nla_len(attr); | |
520 | break; | |
521 | case RTA_MULTIPATH: | |
522 | cfg->fc_mp = nla_data(attr); | |
523 | cfg->fc_mp_len = nla_len(attr); | |
524 | break; | |
525 | case RTA_FLOW: | |
526 | cfg->fc_flow = nla_get_u32(attr); | |
527 | break; | |
4e902c57 TG |
528 | case RTA_TABLE: |
529 | cfg->fc_table = nla_get_u32(attr); | |
530 | break; | |
1da177e4 LT |
531 | } |
532 | } | |
4e902c57 | 533 | |
1da177e4 | 534 | return 0; |
4e902c57 TG |
535 | errout: |
536 | return err; | |
1da177e4 LT |
537 | } |
538 | ||
63f3444f | 539 | static int inet_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 540 | { |
b854272b | 541 | struct net *net = skb->sk->sk_net; |
4e902c57 TG |
542 | struct fib_config cfg; |
543 | struct fib_table *tb; | |
544 | int err; | |
1da177e4 | 545 | |
b854272b DL |
546 | if (net != &init_net) |
547 | return -EINVAL; | |
548 | ||
4e902c57 TG |
549 | err = rtm_to_fib_config(skb, nlh, &cfg); |
550 | if (err < 0) | |
551 | goto errout; | |
1da177e4 | 552 | |
4e902c57 TG |
553 | tb = fib_get_table(cfg.fc_table); |
554 | if (tb == NULL) { | |
555 | err = -ESRCH; | |
556 | goto errout; | |
557 | } | |
558 | ||
559 | err = tb->tb_delete(tb, &cfg); | |
560 | errout: | |
561 | return err; | |
1da177e4 LT |
562 | } |
563 | ||
63f3444f | 564 | static int inet_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 565 | { |
b854272b | 566 | struct net *net = skb->sk->sk_net; |
4e902c57 TG |
567 | struct fib_config cfg; |
568 | struct fib_table *tb; | |
569 | int err; | |
1da177e4 | 570 | |
b854272b DL |
571 | if (net != &init_net) |
572 | return -EINVAL; | |
573 | ||
4e902c57 TG |
574 | err = rtm_to_fib_config(skb, nlh, &cfg); |
575 | if (err < 0) | |
576 | goto errout; | |
1da177e4 | 577 | |
4e902c57 TG |
578 | tb = fib_new_table(cfg.fc_table); |
579 | if (tb == NULL) { | |
580 | err = -ENOBUFS; | |
581 | goto errout; | |
582 | } | |
583 | ||
584 | err = tb->tb_insert(tb, &cfg); | |
585 | errout: | |
586 | return err; | |
1da177e4 LT |
587 | } |
588 | ||
63f3444f | 589 | static int inet_dump_fib(struct sk_buff *skb, struct netlink_callback *cb) |
1da177e4 | 590 | { |
b854272b | 591 | struct net *net = skb->sk->sk_net; |
1af5a8c4 PM |
592 | unsigned int h, s_h; |
593 | unsigned int e = 0, s_e; | |
1da177e4 | 594 | struct fib_table *tb; |
1af5a8c4 PM |
595 | struct hlist_node *node; |
596 | int dumped = 0; | |
1da177e4 | 597 | |
b854272b DL |
598 | if (net != &init_net) |
599 | return 0; | |
600 | ||
be403ea1 TG |
601 | if (nlmsg_len(cb->nlh) >= sizeof(struct rtmsg) && |
602 | ((struct rtmsg *) nlmsg_data(cb->nlh))->rtm_flags & RTM_F_CLONED) | |
1da177e4 LT |
603 | return ip_rt_dump(skb, cb); |
604 | ||
1af5a8c4 PM |
605 | s_h = cb->args[0]; |
606 | s_e = cb->args[1]; | |
607 | ||
608 | for (h = s_h; h < FIB_TABLE_HASHSZ; h++, s_e = 0) { | |
609 | e = 0; | |
610 | hlist_for_each_entry(tb, node, &fib_table_hash[h], tb_hlist) { | |
611 | if (e < s_e) | |
612 | goto next; | |
613 | if (dumped) | |
614 | memset(&cb->args[2], 0, sizeof(cb->args) - | |
e905a9ed | 615 | 2 * sizeof(cb->args[0])); |
1af5a8c4 PM |
616 | if (tb->tb_dump(tb, skb, cb) < 0) |
617 | goto out; | |
618 | dumped = 1; | |
619 | next: | |
620 | e++; | |
621 | } | |
1da177e4 | 622 | } |
1af5a8c4 PM |
623 | out: |
624 | cb->args[1] = e; | |
625 | cb->args[0] = h; | |
1da177e4 LT |
626 | |
627 | return skb->len; | |
628 | } | |
629 | ||
630 | /* Prepare and feed intra-kernel routing request. | |
631 | Really, it should be netlink message, but :-( netlink | |
632 | can be not configured, so that we feed it directly | |
633 | to fib engine. It is legal, because all events occur | |
634 | only when netlink is already locked. | |
635 | */ | |
636 | ||
81f7bf6c | 637 | static void fib_magic(int cmd, int type, __be32 dst, int dst_len, struct in_ifaddr *ifa) |
1da177e4 | 638 | { |
4e902c57 TG |
639 | struct fib_table *tb; |
640 | struct fib_config cfg = { | |
641 | .fc_protocol = RTPROT_KERNEL, | |
642 | .fc_type = type, | |
643 | .fc_dst = dst, | |
644 | .fc_dst_len = dst_len, | |
645 | .fc_prefsrc = ifa->ifa_local, | |
646 | .fc_oif = ifa->ifa_dev->dev->ifindex, | |
647 | .fc_nlflags = NLM_F_CREATE | NLM_F_APPEND, | |
648 | }; | |
1da177e4 LT |
649 | |
650 | if (type == RTN_UNICAST) | |
651 | tb = fib_new_table(RT_TABLE_MAIN); | |
652 | else | |
653 | tb = fib_new_table(RT_TABLE_LOCAL); | |
654 | ||
655 | if (tb == NULL) | |
656 | return; | |
657 | ||
4e902c57 | 658 | cfg.fc_table = tb->tb_id; |
1da177e4 | 659 | |
4e902c57 TG |
660 | if (type != RTN_LOCAL) |
661 | cfg.fc_scope = RT_SCOPE_LINK; | |
662 | else | |
663 | cfg.fc_scope = RT_SCOPE_HOST; | |
1da177e4 LT |
664 | |
665 | if (cmd == RTM_NEWROUTE) | |
4e902c57 | 666 | tb->tb_insert(tb, &cfg); |
1da177e4 | 667 | else |
4e902c57 | 668 | tb->tb_delete(tb, &cfg); |
1da177e4 LT |
669 | } |
670 | ||
0ff60a45 | 671 | void fib_add_ifaddr(struct in_ifaddr *ifa) |
1da177e4 LT |
672 | { |
673 | struct in_device *in_dev = ifa->ifa_dev; | |
674 | struct net_device *dev = in_dev->dev; | |
675 | struct in_ifaddr *prim = ifa; | |
a144ea4b AV |
676 | __be32 mask = ifa->ifa_mask; |
677 | __be32 addr = ifa->ifa_local; | |
678 | __be32 prefix = ifa->ifa_address&mask; | |
1da177e4 LT |
679 | |
680 | if (ifa->ifa_flags&IFA_F_SECONDARY) { | |
681 | prim = inet_ifa_byprefix(in_dev, prefix, mask); | |
682 | if (prim == NULL) { | |
683 | printk(KERN_DEBUG "fib_add_ifaddr: bug: prim == NULL\n"); | |
684 | return; | |
685 | } | |
686 | } | |
687 | ||
688 | fib_magic(RTM_NEWROUTE, RTN_LOCAL, addr, 32, prim); | |
689 | ||
690 | if (!(dev->flags&IFF_UP)) | |
691 | return; | |
692 | ||
693 | /* Add broadcast address, if it is explicitly assigned. */ | |
a144ea4b | 694 | if (ifa->ifa_broadcast && ifa->ifa_broadcast != htonl(0xFFFFFFFF)) |
1da177e4 LT |
695 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim); |
696 | ||
697 | if (!ZERONET(prefix) && !(ifa->ifa_flags&IFA_F_SECONDARY) && | |
698 | (prefix != addr || ifa->ifa_prefixlen < 32)) { | |
699 | fib_magic(RTM_NEWROUTE, dev->flags&IFF_LOOPBACK ? RTN_LOCAL : | |
700 | RTN_UNICAST, prefix, ifa->ifa_prefixlen, prim); | |
701 | ||
702 | /* Add network specific broadcasts, when it takes a sense */ | |
703 | if (ifa->ifa_prefixlen < 31) { | |
704 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix, 32, prim); | |
705 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix|~mask, 32, prim); | |
706 | } | |
707 | } | |
708 | } | |
709 | ||
710 | static void fib_del_ifaddr(struct in_ifaddr *ifa) | |
711 | { | |
712 | struct in_device *in_dev = ifa->ifa_dev; | |
713 | struct net_device *dev = in_dev->dev; | |
714 | struct in_ifaddr *ifa1; | |
715 | struct in_ifaddr *prim = ifa; | |
a144ea4b AV |
716 | __be32 brd = ifa->ifa_address|~ifa->ifa_mask; |
717 | __be32 any = ifa->ifa_address&ifa->ifa_mask; | |
1da177e4 LT |
718 | #define LOCAL_OK 1 |
719 | #define BRD_OK 2 | |
720 | #define BRD0_OK 4 | |
721 | #define BRD1_OK 8 | |
722 | unsigned ok = 0; | |
723 | ||
724 | if (!(ifa->ifa_flags&IFA_F_SECONDARY)) | |
725 | fib_magic(RTM_DELROUTE, dev->flags&IFF_LOOPBACK ? RTN_LOCAL : | |
726 | RTN_UNICAST, any, ifa->ifa_prefixlen, prim); | |
727 | else { | |
728 | prim = inet_ifa_byprefix(in_dev, any, ifa->ifa_mask); | |
729 | if (prim == NULL) { | |
730 | printk(KERN_DEBUG "fib_del_ifaddr: bug: prim == NULL\n"); | |
731 | return; | |
732 | } | |
733 | } | |
734 | ||
735 | /* Deletion is more complicated than add. | |
736 | We should take care of not to delete too much :-) | |
737 | ||
738 | Scan address list to be sure that addresses are really gone. | |
739 | */ | |
740 | ||
741 | for (ifa1 = in_dev->ifa_list; ifa1; ifa1 = ifa1->ifa_next) { | |
742 | if (ifa->ifa_local == ifa1->ifa_local) | |
743 | ok |= LOCAL_OK; | |
744 | if (ifa->ifa_broadcast == ifa1->ifa_broadcast) | |
745 | ok |= BRD_OK; | |
746 | if (brd == ifa1->ifa_broadcast) | |
747 | ok |= BRD1_OK; | |
748 | if (any == ifa1->ifa_broadcast) | |
749 | ok |= BRD0_OK; | |
750 | } | |
751 | ||
752 | if (!(ok&BRD_OK)) | |
753 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim); | |
754 | if (!(ok&BRD1_OK)) | |
755 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, brd, 32, prim); | |
756 | if (!(ok&BRD0_OK)) | |
757 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, any, 32, prim); | |
758 | if (!(ok&LOCAL_OK)) { | |
759 | fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 32, prim); | |
760 | ||
761 | /* Check, that this local address finally disappeared. */ | |
762 | if (inet_addr_type(ifa->ifa_local) != RTN_LOCAL) { | |
763 | /* And the last, but not the least thing. | |
764 | We must flush stray FIB entries. | |
765 | ||
766 | First of all, we scan fib_info list searching | |
767 | for stray nexthop entries, then ignite fib_flush. | |
768 | */ | |
769 | if (fib_sync_down(ifa->ifa_local, NULL, 0)) | |
770 | fib_flush(); | |
771 | } | |
772 | } | |
773 | #undef LOCAL_OK | |
774 | #undef BRD_OK | |
775 | #undef BRD0_OK | |
776 | #undef BRD1_OK | |
777 | } | |
778 | ||
246955fe RO |
779 | static void nl_fib_lookup(struct fib_result_nl *frn, struct fib_table *tb ) |
780 | { | |
e905a9ed | 781 | |
246955fe | 782 | struct fib_result res; |
5f300893 | 783 | struct flowi fl = { .mark = frn->fl_mark, |
47dcf0cb | 784 | .nl_u = { .ip4_u = { .daddr = frn->fl_addr, |
246955fe RO |
785 | .tos = frn->fl_tos, |
786 | .scope = frn->fl_scope } } }; | |
1194ed0a | 787 | |
912a41a4 SV |
788 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
789 | res.r = NULL; | |
790 | #endif | |
791 | ||
1194ed0a | 792 | frn->err = -ENOENT; |
246955fe RO |
793 | if (tb) { |
794 | local_bh_disable(); | |
795 | ||
796 | frn->tb_id = tb->tb_id; | |
797 | frn->err = tb->tb_lookup(tb, &fl, &res); | |
798 | ||
799 | if (!frn->err) { | |
800 | frn->prefixlen = res.prefixlen; | |
801 | frn->nh_sel = res.nh_sel; | |
802 | frn->type = res.type; | |
803 | frn->scope = res.scope; | |
1194ed0a | 804 | fib_res_put(&res); |
246955fe RO |
805 | } |
806 | local_bh_enable(); | |
807 | } | |
808 | } | |
809 | ||
28f7b036 | 810 | static void nl_fib_input(struct sk_buff *skb) |
246955fe | 811 | { |
246955fe | 812 | struct fib_result_nl *frn; |
28f7b036 | 813 | struct nlmsghdr *nlh; |
246955fe | 814 | struct fib_table *tb; |
28f7b036 | 815 | u32 pid; |
1194ed0a | 816 | |
b529ccf2 | 817 | nlh = nlmsg_hdr(skb); |
ea86575e | 818 | if (skb->len < NLMSG_SPACE(0) || skb->len < nlh->nlmsg_len || |
d883a036 | 819 | nlh->nlmsg_len < NLMSG_LENGTH(sizeof(*frn))) |
ea86575e | 820 | return; |
d883a036 DL |
821 | |
822 | skb = skb_clone(skb, GFP_KERNEL); | |
823 | if (skb == NULL) | |
824 | return; | |
825 | nlh = nlmsg_hdr(skb); | |
e905a9ed | 826 | |
246955fe RO |
827 | frn = (struct fib_result_nl *) NLMSG_DATA(nlh); |
828 | tb = fib_get_table(frn->tb_id_in); | |
829 | ||
830 | nl_fib_lookup(frn, tb); | |
e905a9ed | 831 | |
1194ed0a | 832 | pid = NETLINK_CB(skb).pid; /* pid of sending process */ |
246955fe | 833 | NETLINK_CB(skb).pid = 0; /* from kernel */ |
ac6d439d | 834 | NETLINK_CB(skb).dst_group = 0; /* unicast */ |
cd40b7d3 | 835 | netlink_unicast(fibnl, skb, pid, MSG_DONTWAIT); |
e905a9ed | 836 | } |
246955fe RO |
837 | |
838 | static void nl_fib_lookup_init(void) | |
839 | { | |
cd40b7d3 DL |
840 | fibnl = netlink_kernel_create(&init_net, NETLINK_FIB_LOOKUP, 0, |
841 | nl_fib_input, NULL, THIS_MODULE); | |
246955fe RO |
842 | } |
843 | ||
1da177e4 LT |
844 | static void fib_disable_ip(struct net_device *dev, int force) |
845 | { | |
846 | if (fib_sync_down(0, dev, force)) | |
847 | fib_flush(); | |
848 | rt_cache_flush(0); | |
849 | arp_ifdown(dev); | |
850 | } | |
851 | ||
852 | static int fib_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr) | |
853 | { | |
854 | struct in_ifaddr *ifa = (struct in_ifaddr*)ptr; | |
855 | ||
856 | switch (event) { | |
857 | case NETDEV_UP: | |
858 | fib_add_ifaddr(ifa); | |
859 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
860 | fib_sync_up(ifa->ifa_dev->dev); | |
861 | #endif | |
862 | rt_cache_flush(-1); | |
863 | break; | |
864 | case NETDEV_DOWN: | |
865 | fib_del_ifaddr(ifa); | |
9fcc2e8a | 866 | if (ifa->ifa_dev->ifa_list == NULL) { |
1da177e4 LT |
867 | /* Last address was deleted from this interface. |
868 | Disable IP. | |
869 | */ | |
870 | fib_disable_ip(ifa->ifa_dev->dev, 1); | |
871 | } else { | |
872 | rt_cache_flush(-1); | |
873 | } | |
874 | break; | |
875 | } | |
876 | return NOTIFY_DONE; | |
877 | } | |
878 | ||
879 | static int fib_netdev_event(struct notifier_block *this, unsigned long event, void *ptr) | |
880 | { | |
881 | struct net_device *dev = ptr; | |
e5ed6399 | 882 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
1da177e4 | 883 | |
e9dc8653 EB |
884 | if (dev->nd_net != &init_net) |
885 | return NOTIFY_DONE; | |
886 | ||
1da177e4 LT |
887 | if (event == NETDEV_UNREGISTER) { |
888 | fib_disable_ip(dev, 2); | |
889 | return NOTIFY_DONE; | |
890 | } | |
891 | ||
892 | if (!in_dev) | |
893 | return NOTIFY_DONE; | |
894 | ||
895 | switch (event) { | |
896 | case NETDEV_UP: | |
897 | for_ifa(in_dev) { | |
898 | fib_add_ifaddr(ifa); | |
899 | } endfor_ifa(in_dev); | |
900 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
901 | fib_sync_up(dev); | |
902 | #endif | |
903 | rt_cache_flush(-1); | |
904 | break; | |
905 | case NETDEV_DOWN: | |
906 | fib_disable_ip(dev, 0); | |
907 | break; | |
908 | case NETDEV_CHANGEMTU: | |
909 | case NETDEV_CHANGE: | |
910 | rt_cache_flush(0); | |
911 | break; | |
912 | } | |
913 | return NOTIFY_DONE; | |
914 | } | |
915 | ||
916 | static struct notifier_block fib_inetaddr_notifier = { | |
917 | .notifier_call =fib_inetaddr_event, | |
918 | }; | |
919 | ||
920 | static struct notifier_block fib_netdev_notifier = { | |
921 | .notifier_call =fib_netdev_event, | |
922 | }; | |
923 | ||
924 | void __init ip_fib_init(void) | |
925 | { | |
1af5a8c4 PM |
926 | unsigned int i; |
927 | ||
928 | for (i = 0; i < FIB_TABLE_HASHSZ; i++) | |
929 | INIT_HLIST_HEAD(&fib_table_hash[i]); | |
c3e9a353 | 930 | |
e1ef4bf2 | 931 | fib4_rules_init(); |
1da177e4 LT |
932 | |
933 | register_netdevice_notifier(&fib_netdev_notifier); | |
934 | register_inetaddr_notifier(&fib_inetaddr_notifier); | |
246955fe | 935 | nl_fib_lookup_init(); |
63f3444f TG |
936 | |
937 | rtnl_register(PF_INET, RTM_NEWROUTE, inet_rtm_newroute, NULL); | |
938 | rtnl_register(PF_INET, RTM_DELROUTE, inet_rtm_delroute, NULL); | |
939 | rtnl_register(PF_INET, RTM_GETROUTE, NULL, inet_dump_fib); | |
1da177e4 LT |
940 | } |
941 | ||
942 | EXPORT_SYMBOL(inet_addr_type); | |
a1e8733e | 943 | EXPORT_SYMBOL(ip_dev_find); |