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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 | ||
52 | #ifndef CONFIG_IP_MULTIPLE_TABLES | |
53 | ||
1da177e4 LT |
54 | struct fib_table *ip_fib_local_table; |
55 | struct fib_table *ip_fib_main_table; | |
56 | ||
1af5a8c4 PM |
57 | #define FIB_TABLE_HASHSZ 1 |
58 | static struct hlist_head fib_table_hash[FIB_TABLE_HASHSZ]; | |
1da177e4 | 59 | |
1af5a8c4 | 60 | #else |
1da177e4 | 61 | |
1af5a8c4 PM |
62 | #define FIB_TABLE_HASHSZ 256 |
63 | static struct hlist_head fib_table_hash[FIB_TABLE_HASHSZ]; | |
1da177e4 | 64 | |
1af5a8c4 | 65 | struct fib_table *fib_new_table(u32 id) |
1da177e4 LT |
66 | { |
67 | struct fib_table *tb; | |
1af5a8c4 | 68 | unsigned int h; |
1da177e4 | 69 | |
1af5a8c4 PM |
70 | if (id == 0) |
71 | id = RT_TABLE_MAIN; | |
72 | tb = fib_get_table(id); | |
73 | if (tb) | |
74 | return tb; | |
1da177e4 LT |
75 | tb = fib_hash_init(id); |
76 | if (!tb) | |
77 | return NULL; | |
1af5a8c4 PM |
78 | h = id & (FIB_TABLE_HASHSZ - 1); |
79 | hlist_add_head_rcu(&tb->tb_hlist, &fib_table_hash[h]); | |
1da177e4 LT |
80 | return tb; |
81 | } | |
82 | ||
1af5a8c4 PM |
83 | struct fib_table *fib_get_table(u32 id) |
84 | { | |
85 | struct fib_table *tb; | |
86 | struct hlist_node *node; | |
87 | unsigned int h; | |
1da177e4 | 88 | |
1af5a8c4 PM |
89 | if (id == 0) |
90 | id = RT_TABLE_MAIN; | |
91 | h = id & (FIB_TABLE_HASHSZ - 1); | |
92 | rcu_read_lock(); | |
93 | hlist_for_each_entry_rcu(tb, node, &fib_table_hash[h], tb_hlist) { | |
94 | if (tb->tb_id == id) { | |
95 | rcu_read_unlock(); | |
96 | return tb; | |
97 | } | |
98 | } | |
99 | rcu_read_unlock(); | |
100 | return NULL; | |
101 | } | |
1da177e4 LT |
102 | #endif /* CONFIG_IP_MULTIPLE_TABLES */ |
103 | ||
1da177e4 LT |
104 | static void fib_flush(void) |
105 | { | |
106 | int flushed = 0; | |
1da177e4 | 107 | struct fib_table *tb; |
1af5a8c4 PM |
108 | struct hlist_node *node; |
109 | unsigned int h; | |
1da177e4 | 110 | |
1af5a8c4 PM |
111 | for (h = 0; h < FIB_TABLE_HASHSZ; h++) { |
112 | hlist_for_each_entry(tb, node, &fib_table_hash[h], tb_hlist) | |
113 | flushed += tb->tb_flush(tb); | |
1da177e4 | 114 | } |
1da177e4 LT |
115 | |
116 | if (flushed) | |
117 | rt_cache_flush(-1); | |
118 | } | |
119 | ||
120 | /* | |
121 | * Find the first device with a given source address. | |
122 | */ | |
123 | ||
60cad5da | 124 | struct net_device * ip_dev_find(__be32 addr) |
1da177e4 LT |
125 | { |
126 | struct flowi fl = { .nl_u = { .ip4_u = { .daddr = addr } } }; | |
127 | struct fib_result res; | |
128 | struct net_device *dev = NULL; | |
129 | ||
130 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
131 | res.r = NULL; | |
132 | #endif | |
133 | ||
134 | if (!ip_fib_local_table || | |
135 | ip_fib_local_table->tb_lookup(ip_fib_local_table, &fl, &res)) | |
136 | return NULL; | |
137 | if (res.type != RTN_LOCAL) | |
138 | goto out; | |
139 | dev = FIB_RES_DEV(res); | |
140 | ||
141 | if (dev) | |
142 | dev_hold(dev); | |
143 | out: | |
144 | fib_res_put(&res); | |
145 | return dev; | |
146 | } | |
147 | ||
fd683222 | 148 | unsigned inet_addr_type(__be32 addr) |
1da177e4 LT |
149 | { |
150 | struct flowi fl = { .nl_u = { .ip4_u = { .daddr = addr } } }; | |
151 | struct fib_result res; | |
152 | unsigned ret = RTN_BROADCAST; | |
153 | ||
154 | if (ZERONET(addr) || BADCLASS(addr)) | |
155 | return RTN_BROADCAST; | |
156 | if (MULTICAST(addr)) | |
157 | return RTN_MULTICAST; | |
158 | ||
159 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
160 | res.r = NULL; | |
161 | #endif | |
e905a9ed | 162 | |
1da177e4 LT |
163 | if (ip_fib_local_table) { |
164 | ret = RTN_UNICAST; | |
165 | if (!ip_fib_local_table->tb_lookup(ip_fib_local_table, | |
166 | &fl, &res)) { | |
167 | ret = res.type; | |
168 | fib_res_put(&res); | |
169 | } | |
170 | } | |
171 | return ret; | |
172 | } | |
173 | ||
174 | /* Given (packet source, input interface) and optional (dst, oif, tos): | |
175 | - (main) check, that source is valid i.e. not broadcast or our local | |
176 | address. | |
177 | - figure out what "logical" interface this packet arrived | |
178 | and calculate "specific destination" address. | |
179 | - check, that packet arrived from expected physical interface. | |
180 | */ | |
181 | ||
d9c9df8c AV |
182 | int fib_validate_source(__be32 src, __be32 dst, u8 tos, int oif, |
183 | struct net_device *dev, __be32 *spec_dst, u32 *itag) | |
1da177e4 LT |
184 | { |
185 | struct in_device *in_dev; | |
186 | struct flowi fl = { .nl_u = { .ip4_u = | |
187 | { .daddr = src, | |
188 | .saddr = dst, | |
189 | .tos = tos } }, | |
190 | .iif = oif }; | |
191 | struct fib_result res; | |
192 | int no_addr, rpf; | |
193 | int ret; | |
194 | ||
195 | no_addr = rpf = 0; | |
196 | rcu_read_lock(); | |
e5ed6399 | 197 | in_dev = __in_dev_get_rcu(dev); |
1da177e4 LT |
198 | if (in_dev) { |
199 | no_addr = in_dev->ifa_list == NULL; | |
200 | rpf = IN_DEV_RPFILTER(in_dev); | |
201 | } | |
202 | rcu_read_unlock(); | |
203 | ||
204 | if (in_dev == NULL) | |
205 | goto e_inval; | |
206 | ||
207 | if (fib_lookup(&fl, &res)) | |
208 | goto last_resort; | |
209 | if (res.type != RTN_UNICAST) | |
210 | goto e_inval_res; | |
211 | *spec_dst = FIB_RES_PREFSRC(res); | |
212 | fib_combine_itag(itag, &res); | |
213 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
214 | if (FIB_RES_DEV(res) == dev || res.fi->fib_nhs > 1) | |
215 | #else | |
216 | if (FIB_RES_DEV(res) == dev) | |
217 | #endif | |
218 | { | |
219 | ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST; | |
220 | fib_res_put(&res); | |
221 | return ret; | |
222 | } | |
223 | fib_res_put(&res); | |
224 | if (no_addr) | |
225 | goto last_resort; | |
226 | if (rpf) | |
227 | goto e_inval; | |
228 | fl.oif = dev->ifindex; | |
229 | ||
230 | ret = 0; | |
231 | if (fib_lookup(&fl, &res) == 0) { | |
232 | if (res.type == RTN_UNICAST) { | |
233 | *spec_dst = FIB_RES_PREFSRC(res); | |
234 | ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST; | |
235 | } | |
236 | fib_res_put(&res); | |
237 | } | |
238 | return ret; | |
239 | ||
240 | last_resort: | |
241 | if (rpf) | |
242 | goto e_inval; | |
243 | *spec_dst = inet_select_addr(dev, 0, RT_SCOPE_UNIVERSE); | |
244 | *itag = 0; | |
245 | return 0; | |
246 | ||
247 | e_inval_res: | |
248 | fib_res_put(&res); | |
249 | e_inval: | |
250 | return -EINVAL; | |
251 | } | |
252 | ||
81f7bf6c | 253 | static inline __be32 sk_extract_addr(struct sockaddr *addr) |
4e902c57 TG |
254 | { |
255 | return ((struct sockaddr_in *) addr)->sin_addr.s_addr; | |
256 | } | |
257 | ||
258 | static int put_rtax(struct nlattr *mx, int len, int type, u32 value) | |
259 | { | |
260 | struct nlattr *nla; | |
261 | ||
262 | nla = (struct nlattr *) ((char *) mx + len); | |
263 | nla->nla_type = type; | |
264 | nla->nla_len = nla_attr_size(4); | |
265 | *(u32 *) nla_data(nla) = value; | |
266 | ||
267 | return len + nla_total_size(4); | |
268 | } | |
269 | ||
270 | static int rtentry_to_fib_config(int cmd, struct rtentry *rt, | |
271 | struct fib_config *cfg) | |
272 | { | |
6d85c10a | 273 | __be32 addr; |
4e902c57 TG |
274 | int plen; |
275 | ||
276 | memset(cfg, 0, sizeof(*cfg)); | |
277 | ||
278 | if (rt->rt_dst.sa_family != AF_INET) | |
279 | return -EAFNOSUPPORT; | |
280 | ||
281 | /* | |
282 | * Check mask for validity: | |
283 | * a) it must be contiguous. | |
284 | * b) destination must have all host bits clear. | |
285 | * c) if application forgot to set correct family (AF_INET), | |
286 | * reject request unless it is absolutely clear i.e. | |
287 | * both family and mask are zero. | |
288 | */ | |
289 | plen = 32; | |
290 | addr = sk_extract_addr(&rt->rt_dst); | |
291 | if (!(rt->rt_flags & RTF_HOST)) { | |
81f7bf6c | 292 | __be32 mask = sk_extract_addr(&rt->rt_genmask); |
4e902c57 TG |
293 | |
294 | if (rt->rt_genmask.sa_family != AF_INET) { | |
295 | if (mask || rt->rt_genmask.sa_family) | |
296 | return -EAFNOSUPPORT; | |
297 | } | |
298 | ||
299 | if (bad_mask(mask, addr)) | |
300 | return -EINVAL; | |
301 | ||
302 | plen = inet_mask_len(mask); | |
303 | } | |
304 | ||
305 | cfg->fc_dst_len = plen; | |
306 | cfg->fc_dst = addr; | |
307 | ||
308 | if (cmd != SIOCDELRT) { | |
309 | cfg->fc_nlflags = NLM_F_CREATE; | |
310 | cfg->fc_protocol = RTPROT_BOOT; | |
311 | } | |
312 | ||
313 | if (rt->rt_metric) | |
314 | cfg->fc_priority = rt->rt_metric - 1; | |
315 | ||
316 | if (rt->rt_flags & RTF_REJECT) { | |
317 | cfg->fc_scope = RT_SCOPE_HOST; | |
318 | cfg->fc_type = RTN_UNREACHABLE; | |
319 | return 0; | |
320 | } | |
321 | ||
322 | cfg->fc_scope = RT_SCOPE_NOWHERE; | |
323 | cfg->fc_type = RTN_UNICAST; | |
324 | ||
325 | if (rt->rt_dev) { | |
326 | char *colon; | |
327 | struct net_device *dev; | |
328 | char devname[IFNAMSIZ]; | |
329 | ||
330 | if (copy_from_user(devname, rt->rt_dev, IFNAMSIZ-1)) | |
331 | return -EFAULT; | |
332 | ||
333 | devname[IFNAMSIZ-1] = 0; | |
334 | colon = strchr(devname, ':'); | |
335 | if (colon) | |
336 | *colon = 0; | |
881d966b | 337 | dev = __dev_get_by_name(&init_net, devname); |
4e902c57 TG |
338 | if (!dev) |
339 | return -ENODEV; | |
340 | cfg->fc_oif = dev->ifindex; | |
341 | if (colon) { | |
342 | struct in_ifaddr *ifa; | |
343 | struct in_device *in_dev = __in_dev_get_rtnl(dev); | |
344 | if (!in_dev) | |
345 | return -ENODEV; | |
346 | *colon = ':'; | |
347 | for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) | |
348 | if (strcmp(ifa->ifa_label, devname) == 0) | |
349 | break; | |
350 | if (ifa == NULL) | |
351 | return -ENODEV; | |
352 | cfg->fc_prefsrc = ifa->ifa_local; | |
353 | } | |
354 | } | |
355 | ||
356 | addr = sk_extract_addr(&rt->rt_gateway); | |
357 | if (rt->rt_gateway.sa_family == AF_INET && addr) { | |
358 | cfg->fc_gw = addr; | |
359 | if (rt->rt_flags & RTF_GATEWAY && | |
360 | inet_addr_type(addr) == RTN_UNICAST) | |
361 | cfg->fc_scope = RT_SCOPE_UNIVERSE; | |
362 | } | |
363 | ||
364 | if (cmd == SIOCDELRT) | |
365 | return 0; | |
366 | ||
367 | if (rt->rt_flags & RTF_GATEWAY && !cfg->fc_gw) | |
368 | return -EINVAL; | |
369 | ||
370 | if (cfg->fc_scope == RT_SCOPE_NOWHERE) | |
371 | cfg->fc_scope = RT_SCOPE_LINK; | |
372 | ||
373 | if (rt->rt_flags & (RTF_MTU | RTF_WINDOW | RTF_IRTT)) { | |
374 | struct nlattr *mx; | |
375 | int len = 0; | |
376 | ||
377 | mx = kzalloc(3 * nla_total_size(4), GFP_KERNEL); | |
e905a9ed | 378 | if (mx == NULL) |
4e902c57 TG |
379 | return -ENOMEM; |
380 | ||
381 | if (rt->rt_flags & RTF_MTU) | |
382 | len = put_rtax(mx, len, RTAX_ADVMSS, rt->rt_mtu - 40); | |
383 | ||
384 | if (rt->rt_flags & RTF_WINDOW) | |
385 | len = put_rtax(mx, len, RTAX_WINDOW, rt->rt_window); | |
386 | ||
387 | if (rt->rt_flags & RTF_IRTT) | |
388 | len = put_rtax(mx, len, RTAX_RTT, rt->rt_irtt << 3); | |
389 | ||
390 | cfg->fc_mx = mx; | |
391 | cfg->fc_mx_len = len; | |
392 | } | |
393 | ||
394 | return 0; | |
395 | } | |
396 | ||
1da177e4 LT |
397 | /* |
398 | * Handle IP routing ioctl calls. These are used to manipulate the routing tables | |
399 | */ | |
e905a9ed | 400 | |
1da177e4 LT |
401 | int ip_rt_ioctl(unsigned int cmd, void __user *arg) |
402 | { | |
4e902c57 TG |
403 | struct fib_config cfg; |
404 | struct rtentry rt; | |
1da177e4 | 405 | int err; |
1da177e4 LT |
406 | |
407 | switch (cmd) { | |
408 | case SIOCADDRT: /* Add a route */ | |
409 | case SIOCDELRT: /* Delete a route */ | |
410 | if (!capable(CAP_NET_ADMIN)) | |
411 | return -EPERM; | |
4e902c57 TG |
412 | |
413 | if (copy_from_user(&rt, arg, sizeof(rt))) | |
1da177e4 | 414 | return -EFAULT; |
4e902c57 | 415 | |
1da177e4 | 416 | rtnl_lock(); |
4e902c57 | 417 | err = rtentry_to_fib_config(cmd, &rt, &cfg); |
1da177e4 | 418 | if (err == 0) { |
4e902c57 TG |
419 | struct fib_table *tb; |
420 | ||
1da177e4 | 421 | if (cmd == SIOCDELRT) { |
4e902c57 | 422 | tb = fib_get_table(cfg.fc_table); |
1da177e4 | 423 | if (tb) |
4e902c57 TG |
424 | err = tb->tb_delete(tb, &cfg); |
425 | else | |
426 | err = -ESRCH; | |
1da177e4 | 427 | } else { |
4e902c57 | 428 | tb = fib_new_table(cfg.fc_table); |
1da177e4 | 429 | if (tb) |
4e902c57 TG |
430 | err = tb->tb_insert(tb, &cfg); |
431 | else | |
432 | err = -ENOBUFS; | |
1da177e4 | 433 | } |
4e902c57 TG |
434 | |
435 | /* allocated by rtentry_to_fib_config() */ | |
436 | kfree(cfg.fc_mx); | |
1da177e4 LT |
437 | } |
438 | rtnl_unlock(); | |
439 | return err; | |
440 | } | |
441 | return -EINVAL; | |
442 | } | |
443 | ||
ef7c79ed | 444 | const struct nla_policy rtm_ipv4_policy[RTA_MAX+1] = { |
4e902c57 TG |
445 | [RTA_DST] = { .type = NLA_U32 }, |
446 | [RTA_SRC] = { .type = NLA_U32 }, | |
447 | [RTA_IIF] = { .type = NLA_U32 }, | |
448 | [RTA_OIF] = { .type = NLA_U32 }, | |
449 | [RTA_GATEWAY] = { .type = NLA_U32 }, | |
450 | [RTA_PRIORITY] = { .type = NLA_U32 }, | |
451 | [RTA_PREFSRC] = { .type = NLA_U32 }, | |
452 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
5176f91e | 453 | [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) }, |
4e902c57 TG |
454 | [RTA_PROTOINFO] = { .type = NLA_U32 }, |
455 | [RTA_FLOW] = { .type = NLA_U32 }, | |
4e902c57 TG |
456 | }; |
457 | ||
458 | static int rtm_to_fib_config(struct sk_buff *skb, struct nlmsghdr *nlh, | |
459 | struct fib_config *cfg) | |
1da177e4 | 460 | { |
4e902c57 TG |
461 | struct nlattr *attr; |
462 | int err, remaining; | |
463 | struct rtmsg *rtm; | |
464 | ||
465 | err = nlmsg_validate(nlh, sizeof(*rtm), RTA_MAX, rtm_ipv4_policy); | |
466 | if (err < 0) | |
467 | goto errout; | |
468 | ||
469 | memset(cfg, 0, sizeof(*cfg)); | |
470 | ||
471 | rtm = nlmsg_data(nlh); | |
4e902c57 | 472 | cfg->fc_dst_len = rtm->rtm_dst_len; |
4e902c57 TG |
473 | cfg->fc_tos = rtm->rtm_tos; |
474 | cfg->fc_table = rtm->rtm_table; | |
475 | cfg->fc_protocol = rtm->rtm_protocol; | |
476 | cfg->fc_scope = rtm->rtm_scope; | |
477 | cfg->fc_type = rtm->rtm_type; | |
478 | cfg->fc_flags = rtm->rtm_flags; | |
479 | cfg->fc_nlflags = nlh->nlmsg_flags; | |
480 | ||
481 | cfg->fc_nlinfo.pid = NETLINK_CB(skb).pid; | |
482 | cfg->fc_nlinfo.nlh = nlh; | |
483 | ||
a0ee18b9 TG |
484 | if (cfg->fc_type > RTN_MAX) { |
485 | err = -EINVAL; | |
486 | goto errout; | |
487 | } | |
488 | ||
4e902c57 TG |
489 | nlmsg_for_each_attr(attr, nlh, sizeof(struct rtmsg), remaining) { |
490 | switch (attr->nla_type) { | |
491 | case RTA_DST: | |
17fb2c64 | 492 | cfg->fc_dst = nla_get_be32(attr); |
4e902c57 | 493 | break; |
4e902c57 TG |
494 | case RTA_OIF: |
495 | cfg->fc_oif = nla_get_u32(attr); | |
496 | break; | |
497 | case RTA_GATEWAY: | |
17fb2c64 | 498 | cfg->fc_gw = nla_get_be32(attr); |
4e902c57 TG |
499 | break; |
500 | case RTA_PRIORITY: | |
501 | cfg->fc_priority = nla_get_u32(attr); | |
502 | break; | |
503 | case RTA_PREFSRC: | |
17fb2c64 | 504 | cfg->fc_prefsrc = nla_get_be32(attr); |
4e902c57 TG |
505 | break; |
506 | case RTA_METRICS: | |
507 | cfg->fc_mx = nla_data(attr); | |
508 | cfg->fc_mx_len = nla_len(attr); | |
509 | break; | |
510 | case RTA_MULTIPATH: | |
511 | cfg->fc_mp = nla_data(attr); | |
512 | cfg->fc_mp_len = nla_len(attr); | |
513 | break; | |
514 | case RTA_FLOW: | |
515 | cfg->fc_flow = nla_get_u32(attr); | |
516 | break; | |
4e902c57 TG |
517 | case RTA_TABLE: |
518 | cfg->fc_table = nla_get_u32(attr); | |
519 | break; | |
1da177e4 LT |
520 | } |
521 | } | |
4e902c57 | 522 | |
1da177e4 | 523 | return 0; |
4e902c57 TG |
524 | errout: |
525 | return err; | |
1da177e4 LT |
526 | } |
527 | ||
63f3444f | 528 | static int inet_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 529 | { |
4e902c57 TG |
530 | struct fib_config cfg; |
531 | struct fib_table *tb; | |
532 | int err; | |
1da177e4 | 533 | |
4e902c57 TG |
534 | err = rtm_to_fib_config(skb, nlh, &cfg); |
535 | if (err < 0) | |
536 | goto errout; | |
1da177e4 | 537 | |
4e902c57 TG |
538 | tb = fib_get_table(cfg.fc_table); |
539 | if (tb == NULL) { | |
540 | err = -ESRCH; | |
541 | goto errout; | |
542 | } | |
543 | ||
544 | err = tb->tb_delete(tb, &cfg); | |
545 | errout: | |
546 | return err; | |
1da177e4 LT |
547 | } |
548 | ||
63f3444f | 549 | static int inet_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 550 | { |
4e902c57 TG |
551 | struct fib_config cfg; |
552 | struct fib_table *tb; | |
553 | int err; | |
1da177e4 | 554 | |
4e902c57 TG |
555 | err = rtm_to_fib_config(skb, nlh, &cfg); |
556 | if (err < 0) | |
557 | goto errout; | |
1da177e4 | 558 | |
4e902c57 TG |
559 | tb = fib_new_table(cfg.fc_table); |
560 | if (tb == NULL) { | |
561 | err = -ENOBUFS; | |
562 | goto errout; | |
563 | } | |
564 | ||
565 | err = tb->tb_insert(tb, &cfg); | |
566 | errout: | |
567 | return err; | |
1da177e4 LT |
568 | } |
569 | ||
63f3444f | 570 | static int inet_dump_fib(struct sk_buff *skb, struct netlink_callback *cb) |
1da177e4 | 571 | { |
1af5a8c4 PM |
572 | unsigned int h, s_h; |
573 | unsigned int e = 0, s_e; | |
1da177e4 | 574 | struct fib_table *tb; |
1af5a8c4 PM |
575 | struct hlist_node *node; |
576 | int dumped = 0; | |
1da177e4 | 577 | |
be403ea1 TG |
578 | if (nlmsg_len(cb->nlh) >= sizeof(struct rtmsg) && |
579 | ((struct rtmsg *) nlmsg_data(cb->nlh))->rtm_flags & RTM_F_CLONED) | |
1da177e4 LT |
580 | return ip_rt_dump(skb, cb); |
581 | ||
1af5a8c4 PM |
582 | s_h = cb->args[0]; |
583 | s_e = cb->args[1]; | |
584 | ||
585 | for (h = s_h; h < FIB_TABLE_HASHSZ; h++, s_e = 0) { | |
586 | e = 0; | |
587 | hlist_for_each_entry(tb, node, &fib_table_hash[h], tb_hlist) { | |
588 | if (e < s_e) | |
589 | goto next; | |
590 | if (dumped) | |
591 | memset(&cb->args[2], 0, sizeof(cb->args) - | |
e905a9ed | 592 | 2 * sizeof(cb->args[0])); |
1af5a8c4 PM |
593 | if (tb->tb_dump(tb, skb, cb) < 0) |
594 | goto out; | |
595 | dumped = 1; | |
596 | next: | |
597 | e++; | |
598 | } | |
1da177e4 | 599 | } |
1af5a8c4 PM |
600 | out: |
601 | cb->args[1] = e; | |
602 | cb->args[0] = h; | |
1da177e4 LT |
603 | |
604 | return skb->len; | |
605 | } | |
606 | ||
607 | /* Prepare and feed intra-kernel routing request. | |
608 | Really, it should be netlink message, but :-( netlink | |
609 | can be not configured, so that we feed it directly | |
610 | to fib engine. It is legal, because all events occur | |
611 | only when netlink is already locked. | |
612 | */ | |
613 | ||
81f7bf6c | 614 | static void fib_magic(int cmd, int type, __be32 dst, int dst_len, struct in_ifaddr *ifa) |
1da177e4 | 615 | { |
4e902c57 TG |
616 | struct fib_table *tb; |
617 | struct fib_config cfg = { | |
618 | .fc_protocol = RTPROT_KERNEL, | |
619 | .fc_type = type, | |
620 | .fc_dst = dst, | |
621 | .fc_dst_len = dst_len, | |
622 | .fc_prefsrc = ifa->ifa_local, | |
623 | .fc_oif = ifa->ifa_dev->dev->ifindex, | |
624 | .fc_nlflags = NLM_F_CREATE | NLM_F_APPEND, | |
625 | }; | |
1da177e4 LT |
626 | |
627 | if (type == RTN_UNICAST) | |
628 | tb = fib_new_table(RT_TABLE_MAIN); | |
629 | else | |
630 | tb = fib_new_table(RT_TABLE_LOCAL); | |
631 | ||
632 | if (tb == NULL) | |
633 | return; | |
634 | ||
4e902c57 | 635 | cfg.fc_table = tb->tb_id; |
1da177e4 | 636 | |
4e902c57 TG |
637 | if (type != RTN_LOCAL) |
638 | cfg.fc_scope = RT_SCOPE_LINK; | |
639 | else | |
640 | cfg.fc_scope = RT_SCOPE_HOST; | |
1da177e4 LT |
641 | |
642 | if (cmd == RTM_NEWROUTE) | |
4e902c57 | 643 | tb->tb_insert(tb, &cfg); |
1da177e4 | 644 | else |
4e902c57 | 645 | tb->tb_delete(tb, &cfg); |
1da177e4 LT |
646 | } |
647 | ||
0ff60a45 | 648 | void fib_add_ifaddr(struct in_ifaddr *ifa) |
1da177e4 LT |
649 | { |
650 | struct in_device *in_dev = ifa->ifa_dev; | |
651 | struct net_device *dev = in_dev->dev; | |
652 | struct in_ifaddr *prim = ifa; | |
a144ea4b AV |
653 | __be32 mask = ifa->ifa_mask; |
654 | __be32 addr = ifa->ifa_local; | |
655 | __be32 prefix = ifa->ifa_address&mask; | |
1da177e4 LT |
656 | |
657 | if (ifa->ifa_flags&IFA_F_SECONDARY) { | |
658 | prim = inet_ifa_byprefix(in_dev, prefix, mask); | |
659 | if (prim == NULL) { | |
660 | printk(KERN_DEBUG "fib_add_ifaddr: bug: prim == NULL\n"); | |
661 | return; | |
662 | } | |
663 | } | |
664 | ||
665 | fib_magic(RTM_NEWROUTE, RTN_LOCAL, addr, 32, prim); | |
666 | ||
667 | if (!(dev->flags&IFF_UP)) | |
668 | return; | |
669 | ||
670 | /* Add broadcast address, if it is explicitly assigned. */ | |
a144ea4b | 671 | if (ifa->ifa_broadcast && ifa->ifa_broadcast != htonl(0xFFFFFFFF)) |
1da177e4 LT |
672 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim); |
673 | ||
674 | if (!ZERONET(prefix) && !(ifa->ifa_flags&IFA_F_SECONDARY) && | |
675 | (prefix != addr || ifa->ifa_prefixlen < 32)) { | |
676 | fib_magic(RTM_NEWROUTE, dev->flags&IFF_LOOPBACK ? RTN_LOCAL : | |
677 | RTN_UNICAST, prefix, ifa->ifa_prefixlen, prim); | |
678 | ||
679 | /* Add network specific broadcasts, when it takes a sense */ | |
680 | if (ifa->ifa_prefixlen < 31) { | |
681 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix, 32, prim); | |
682 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix|~mask, 32, prim); | |
683 | } | |
684 | } | |
685 | } | |
686 | ||
687 | static void fib_del_ifaddr(struct in_ifaddr *ifa) | |
688 | { | |
689 | struct in_device *in_dev = ifa->ifa_dev; | |
690 | struct net_device *dev = in_dev->dev; | |
691 | struct in_ifaddr *ifa1; | |
692 | struct in_ifaddr *prim = ifa; | |
a144ea4b AV |
693 | __be32 brd = ifa->ifa_address|~ifa->ifa_mask; |
694 | __be32 any = ifa->ifa_address&ifa->ifa_mask; | |
1da177e4 LT |
695 | #define LOCAL_OK 1 |
696 | #define BRD_OK 2 | |
697 | #define BRD0_OK 4 | |
698 | #define BRD1_OK 8 | |
699 | unsigned ok = 0; | |
700 | ||
701 | if (!(ifa->ifa_flags&IFA_F_SECONDARY)) | |
702 | fib_magic(RTM_DELROUTE, dev->flags&IFF_LOOPBACK ? RTN_LOCAL : | |
703 | RTN_UNICAST, any, ifa->ifa_prefixlen, prim); | |
704 | else { | |
705 | prim = inet_ifa_byprefix(in_dev, any, ifa->ifa_mask); | |
706 | if (prim == NULL) { | |
707 | printk(KERN_DEBUG "fib_del_ifaddr: bug: prim == NULL\n"); | |
708 | return; | |
709 | } | |
710 | } | |
711 | ||
712 | /* Deletion is more complicated than add. | |
713 | We should take care of not to delete too much :-) | |
714 | ||
715 | Scan address list to be sure that addresses are really gone. | |
716 | */ | |
717 | ||
718 | for (ifa1 = in_dev->ifa_list; ifa1; ifa1 = ifa1->ifa_next) { | |
719 | if (ifa->ifa_local == ifa1->ifa_local) | |
720 | ok |= LOCAL_OK; | |
721 | if (ifa->ifa_broadcast == ifa1->ifa_broadcast) | |
722 | ok |= BRD_OK; | |
723 | if (brd == ifa1->ifa_broadcast) | |
724 | ok |= BRD1_OK; | |
725 | if (any == ifa1->ifa_broadcast) | |
726 | ok |= BRD0_OK; | |
727 | } | |
728 | ||
729 | if (!(ok&BRD_OK)) | |
730 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim); | |
731 | if (!(ok&BRD1_OK)) | |
732 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, brd, 32, prim); | |
733 | if (!(ok&BRD0_OK)) | |
734 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, any, 32, prim); | |
735 | if (!(ok&LOCAL_OK)) { | |
736 | fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 32, prim); | |
737 | ||
738 | /* Check, that this local address finally disappeared. */ | |
739 | if (inet_addr_type(ifa->ifa_local) != RTN_LOCAL) { | |
740 | /* And the last, but not the least thing. | |
741 | We must flush stray FIB entries. | |
742 | ||
743 | First of all, we scan fib_info list searching | |
744 | for stray nexthop entries, then ignite fib_flush. | |
745 | */ | |
746 | if (fib_sync_down(ifa->ifa_local, NULL, 0)) | |
747 | fib_flush(); | |
748 | } | |
749 | } | |
750 | #undef LOCAL_OK | |
751 | #undef BRD_OK | |
752 | #undef BRD0_OK | |
753 | #undef BRD1_OK | |
754 | } | |
755 | ||
246955fe RO |
756 | static void nl_fib_lookup(struct fib_result_nl *frn, struct fib_table *tb ) |
757 | { | |
e905a9ed | 758 | |
246955fe | 759 | struct fib_result res; |
5f300893 | 760 | struct flowi fl = { .mark = frn->fl_mark, |
47dcf0cb | 761 | .nl_u = { .ip4_u = { .daddr = frn->fl_addr, |
246955fe RO |
762 | .tos = frn->fl_tos, |
763 | .scope = frn->fl_scope } } }; | |
1194ed0a | 764 | |
912a41a4 SV |
765 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
766 | res.r = NULL; | |
767 | #endif | |
768 | ||
1194ed0a | 769 | frn->err = -ENOENT; |
246955fe RO |
770 | if (tb) { |
771 | local_bh_disable(); | |
772 | ||
773 | frn->tb_id = tb->tb_id; | |
774 | frn->err = tb->tb_lookup(tb, &fl, &res); | |
775 | ||
776 | if (!frn->err) { | |
777 | frn->prefixlen = res.prefixlen; | |
778 | frn->nh_sel = res.nh_sel; | |
779 | frn->type = res.type; | |
780 | frn->scope = res.scope; | |
1194ed0a | 781 | fib_res_put(&res); |
246955fe RO |
782 | } |
783 | local_bh_enable(); | |
784 | } | |
785 | } | |
786 | ||
787 | static void nl_fib_input(struct sock *sk, int len) | |
788 | { | |
789 | struct sk_buff *skb = NULL; | |
e905a9ed | 790 | struct nlmsghdr *nlh = NULL; |
246955fe | 791 | struct fib_result_nl *frn; |
e905a9ed | 792 | u32 pid; |
246955fe | 793 | struct fib_table *tb; |
e905a9ed | 794 | |
ea86575e | 795 | skb = skb_dequeue(&sk->sk_receive_queue); |
1194ed0a AK |
796 | if (skb == NULL) |
797 | return; | |
798 | ||
b529ccf2 | 799 | nlh = nlmsg_hdr(skb); |
ea86575e TG |
800 | if (skb->len < NLMSG_SPACE(0) || skb->len < nlh->nlmsg_len || |
801 | nlh->nlmsg_len < NLMSG_LENGTH(sizeof(*frn))) { | |
802 | kfree_skb(skb); | |
803 | return; | |
804 | } | |
e905a9ed | 805 | |
246955fe RO |
806 | frn = (struct fib_result_nl *) NLMSG_DATA(nlh); |
807 | tb = fib_get_table(frn->tb_id_in); | |
808 | ||
809 | nl_fib_lookup(frn, tb); | |
e905a9ed | 810 | |
1194ed0a | 811 | pid = NETLINK_CB(skb).pid; /* pid of sending process */ |
246955fe | 812 | NETLINK_CB(skb).pid = 0; /* from kernel */ |
ac6d439d | 813 | NETLINK_CB(skb).dst_group = 0; /* unicast */ |
246955fe | 814 | netlink_unicast(sk, skb, pid, MSG_DONTWAIT); |
e905a9ed | 815 | } |
246955fe RO |
816 | |
817 | static void nl_fib_lookup_init(void) | |
818 | { | |
b4b51029 EB |
819 | netlink_kernel_create(&init_net, NETLINK_FIB_LOOKUP, 0, nl_fib_input, |
820 | NULL, THIS_MODULE); | |
246955fe RO |
821 | } |
822 | ||
1da177e4 LT |
823 | static void fib_disable_ip(struct net_device *dev, int force) |
824 | { | |
825 | if (fib_sync_down(0, dev, force)) | |
826 | fib_flush(); | |
827 | rt_cache_flush(0); | |
828 | arp_ifdown(dev); | |
829 | } | |
830 | ||
831 | static int fib_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr) | |
832 | { | |
833 | struct in_ifaddr *ifa = (struct in_ifaddr*)ptr; | |
834 | ||
835 | switch (event) { | |
836 | case NETDEV_UP: | |
837 | fib_add_ifaddr(ifa); | |
838 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
839 | fib_sync_up(ifa->ifa_dev->dev); | |
840 | #endif | |
841 | rt_cache_flush(-1); | |
842 | break; | |
843 | case NETDEV_DOWN: | |
844 | fib_del_ifaddr(ifa); | |
9fcc2e8a | 845 | if (ifa->ifa_dev->ifa_list == NULL) { |
1da177e4 LT |
846 | /* Last address was deleted from this interface. |
847 | Disable IP. | |
848 | */ | |
849 | fib_disable_ip(ifa->ifa_dev->dev, 1); | |
850 | } else { | |
851 | rt_cache_flush(-1); | |
852 | } | |
853 | break; | |
854 | } | |
855 | return NOTIFY_DONE; | |
856 | } | |
857 | ||
858 | static int fib_netdev_event(struct notifier_block *this, unsigned long event, void *ptr) | |
859 | { | |
860 | struct net_device *dev = ptr; | |
e5ed6399 | 861 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
1da177e4 | 862 | |
e9dc8653 EB |
863 | if (dev->nd_net != &init_net) |
864 | return NOTIFY_DONE; | |
865 | ||
1da177e4 LT |
866 | if (event == NETDEV_UNREGISTER) { |
867 | fib_disable_ip(dev, 2); | |
868 | return NOTIFY_DONE; | |
869 | } | |
870 | ||
871 | if (!in_dev) | |
872 | return NOTIFY_DONE; | |
873 | ||
874 | switch (event) { | |
875 | case NETDEV_UP: | |
876 | for_ifa(in_dev) { | |
877 | fib_add_ifaddr(ifa); | |
878 | } endfor_ifa(in_dev); | |
879 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
880 | fib_sync_up(dev); | |
881 | #endif | |
882 | rt_cache_flush(-1); | |
883 | break; | |
884 | case NETDEV_DOWN: | |
885 | fib_disable_ip(dev, 0); | |
886 | break; | |
887 | case NETDEV_CHANGEMTU: | |
888 | case NETDEV_CHANGE: | |
889 | rt_cache_flush(0); | |
890 | break; | |
891 | } | |
892 | return NOTIFY_DONE; | |
893 | } | |
894 | ||
895 | static struct notifier_block fib_inetaddr_notifier = { | |
896 | .notifier_call =fib_inetaddr_event, | |
897 | }; | |
898 | ||
899 | static struct notifier_block fib_netdev_notifier = { | |
900 | .notifier_call =fib_netdev_event, | |
901 | }; | |
902 | ||
903 | void __init ip_fib_init(void) | |
904 | { | |
1af5a8c4 PM |
905 | unsigned int i; |
906 | ||
907 | for (i = 0; i < FIB_TABLE_HASHSZ; i++) | |
908 | INIT_HLIST_HEAD(&fib_table_hash[i]); | |
1da177e4 LT |
909 | #ifndef CONFIG_IP_MULTIPLE_TABLES |
910 | ip_fib_local_table = fib_hash_init(RT_TABLE_LOCAL); | |
1af5a8c4 | 911 | hlist_add_head_rcu(&ip_fib_local_table->tb_hlist, &fib_table_hash[0]); |
1da177e4 | 912 | ip_fib_main_table = fib_hash_init(RT_TABLE_MAIN); |
1af5a8c4 | 913 | hlist_add_head_rcu(&ip_fib_main_table->tb_hlist, &fib_table_hash[0]); |
1da177e4 | 914 | #else |
e1ef4bf2 | 915 | fib4_rules_init(); |
1da177e4 LT |
916 | #endif |
917 | ||
918 | register_netdevice_notifier(&fib_netdev_notifier); | |
919 | register_inetaddr_notifier(&fib_inetaddr_notifier); | |
246955fe | 920 | nl_fib_lookup_init(); |
63f3444f TG |
921 | |
922 | rtnl_register(PF_INET, RTM_NEWROUTE, inet_rtm_newroute, NULL); | |
923 | rtnl_register(PF_INET, RTM_DELROUTE, inet_rtm_delroute, NULL); | |
924 | rtnl_register(PF_INET, RTM_GETROUTE, NULL, inet_dump_fib); | |
1da177e4 LT |
925 | } |
926 | ||
927 | EXPORT_SYMBOL(inet_addr_type); | |
a1e8733e | 928 | EXPORT_SYMBOL(ip_dev_find); |