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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 | |
1af5a8c4 | 62 | #else |
1da177e4 | 63 | |
1af5a8c4 PM |
64 | #define FIB_TABLE_HASHSZ 256 |
65 | static struct hlist_head fib_table_hash[FIB_TABLE_HASHSZ]; | |
1da177e4 | 66 | |
1af5a8c4 | 67 | struct fib_table *fib_new_table(u32 id) |
1da177e4 LT |
68 | { |
69 | struct fib_table *tb; | |
1af5a8c4 | 70 | unsigned int h; |
1da177e4 | 71 | |
1af5a8c4 PM |
72 | if (id == 0) |
73 | id = RT_TABLE_MAIN; | |
74 | tb = fib_get_table(id); | |
75 | if (tb) | |
76 | return tb; | |
1da177e4 LT |
77 | tb = fib_hash_init(id); |
78 | if (!tb) | |
79 | return NULL; | |
1af5a8c4 PM |
80 | h = id & (FIB_TABLE_HASHSZ - 1); |
81 | hlist_add_head_rcu(&tb->tb_hlist, &fib_table_hash[h]); | |
1da177e4 LT |
82 | return tb; |
83 | } | |
84 | ||
1af5a8c4 PM |
85 | struct fib_table *fib_get_table(u32 id) |
86 | { | |
87 | struct fib_table *tb; | |
88 | struct hlist_node *node; | |
89 | unsigned int h; | |
1da177e4 | 90 | |
1af5a8c4 PM |
91 | if (id == 0) |
92 | id = RT_TABLE_MAIN; | |
93 | h = id & (FIB_TABLE_HASHSZ - 1); | |
94 | rcu_read_lock(); | |
95 | hlist_for_each_entry_rcu(tb, node, &fib_table_hash[h], tb_hlist) { | |
96 | if (tb->tb_id == id) { | |
97 | rcu_read_unlock(); | |
98 | return tb; | |
99 | } | |
100 | } | |
101 | rcu_read_unlock(); | |
102 | return NULL; | |
103 | } | |
1da177e4 LT |
104 | #endif /* CONFIG_IP_MULTIPLE_TABLES */ |
105 | ||
1da177e4 LT |
106 | static void fib_flush(void) |
107 | { | |
108 | int flushed = 0; | |
1da177e4 | 109 | struct fib_table *tb; |
1af5a8c4 PM |
110 | struct hlist_node *node; |
111 | unsigned int h; | |
1da177e4 | 112 | |
1af5a8c4 PM |
113 | for (h = 0; h < FIB_TABLE_HASHSZ; h++) { |
114 | hlist_for_each_entry(tb, node, &fib_table_hash[h], tb_hlist) | |
115 | flushed += tb->tb_flush(tb); | |
1da177e4 | 116 | } |
1da177e4 LT |
117 | |
118 | if (flushed) | |
119 | rt_cache_flush(-1); | |
120 | } | |
121 | ||
122 | /* | |
123 | * Find the first device with a given source address. | |
124 | */ | |
125 | ||
60cad5da | 126 | struct net_device * ip_dev_find(__be32 addr) |
1da177e4 LT |
127 | { |
128 | struct flowi fl = { .nl_u = { .ip4_u = { .daddr = addr } } }; | |
129 | struct fib_result res; | |
130 | struct net_device *dev = NULL; | |
131 | ||
132 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
133 | res.r = NULL; | |
134 | #endif | |
135 | ||
136 | if (!ip_fib_local_table || | |
137 | ip_fib_local_table->tb_lookup(ip_fib_local_table, &fl, &res)) | |
138 | return NULL; | |
139 | if (res.type != RTN_LOCAL) | |
140 | goto out; | |
141 | dev = FIB_RES_DEV(res); | |
142 | ||
143 | if (dev) | |
144 | dev_hold(dev); | |
145 | out: | |
146 | fib_res_put(&res); | |
147 | return dev; | |
148 | } | |
149 | ||
fd683222 | 150 | unsigned inet_addr_type(__be32 addr) |
1da177e4 LT |
151 | { |
152 | struct flowi fl = { .nl_u = { .ip4_u = { .daddr = addr } } }; | |
153 | struct fib_result res; | |
154 | unsigned ret = RTN_BROADCAST; | |
155 | ||
156 | if (ZERONET(addr) || BADCLASS(addr)) | |
157 | return RTN_BROADCAST; | |
158 | if (MULTICAST(addr)) | |
159 | return RTN_MULTICAST; | |
160 | ||
161 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
162 | res.r = NULL; | |
163 | #endif | |
e905a9ed | 164 | |
1da177e4 LT |
165 | if (ip_fib_local_table) { |
166 | ret = RTN_UNICAST; | |
167 | if (!ip_fib_local_table->tb_lookup(ip_fib_local_table, | |
168 | &fl, &res)) { | |
169 | ret = res.type; | |
170 | fib_res_put(&res); | |
171 | } | |
172 | } | |
173 | return ret; | |
174 | } | |
175 | ||
176 | /* Given (packet source, input interface) and optional (dst, oif, tos): | |
177 | - (main) check, that source is valid i.e. not broadcast or our local | |
178 | address. | |
179 | - figure out what "logical" interface this packet arrived | |
180 | and calculate "specific destination" address. | |
181 | - check, that packet arrived from expected physical interface. | |
182 | */ | |
183 | ||
d9c9df8c AV |
184 | int fib_validate_source(__be32 src, __be32 dst, u8 tos, int oif, |
185 | struct net_device *dev, __be32 *spec_dst, u32 *itag) | |
1da177e4 LT |
186 | { |
187 | struct in_device *in_dev; | |
188 | struct flowi fl = { .nl_u = { .ip4_u = | |
189 | { .daddr = src, | |
190 | .saddr = dst, | |
191 | .tos = tos } }, | |
192 | .iif = oif }; | |
193 | struct fib_result res; | |
194 | int no_addr, rpf; | |
195 | int ret; | |
196 | ||
197 | no_addr = rpf = 0; | |
198 | rcu_read_lock(); | |
e5ed6399 | 199 | in_dev = __in_dev_get_rcu(dev); |
1da177e4 LT |
200 | if (in_dev) { |
201 | no_addr = in_dev->ifa_list == NULL; | |
202 | rpf = IN_DEV_RPFILTER(in_dev); | |
203 | } | |
204 | rcu_read_unlock(); | |
205 | ||
206 | if (in_dev == NULL) | |
207 | goto e_inval; | |
208 | ||
209 | if (fib_lookup(&fl, &res)) | |
210 | goto last_resort; | |
211 | if (res.type != RTN_UNICAST) | |
212 | goto e_inval_res; | |
213 | *spec_dst = FIB_RES_PREFSRC(res); | |
214 | fib_combine_itag(itag, &res); | |
215 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
216 | if (FIB_RES_DEV(res) == dev || res.fi->fib_nhs > 1) | |
217 | #else | |
218 | if (FIB_RES_DEV(res) == dev) | |
219 | #endif | |
220 | { | |
221 | ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST; | |
222 | fib_res_put(&res); | |
223 | return ret; | |
224 | } | |
225 | fib_res_put(&res); | |
226 | if (no_addr) | |
227 | goto last_resort; | |
228 | if (rpf) | |
229 | goto e_inval; | |
230 | fl.oif = dev->ifindex; | |
231 | ||
232 | ret = 0; | |
233 | if (fib_lookup(&fl, &res) == 0) { | |
234 | if (res.type == RTN_UNICAST) { | |
235 | *spec_dst = FIB_RES_PREFSRC(res); | |
236 | ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST; | |
237 | } | |
238 | fib_res_put(&res); | |
239 | } | |
240 | return ret; | |
241 | ||
242 | last_resort: | |
243 | if (rpf) | |
244 | goto e_inval; | |
245 | *spec_dst = inet_select_addr(dev, 0, RT_SCOPE_UNIVERSE); | |
246 | *itag = 0; | |
247 | return 0; | |
248 | ||
249 | e_inval_res: | |
250 | fib_res_put(&res); | |
251 | e_inval: | |
252 | return -EINVAL; | |
253 | } | |
254 | ||
81f7bf6c | 255 | static inline __be32 sk_extract_addr(struct sockaddr *addr) |
4e902c57 TG |
256 | { |
257 | return ((struct sockaddr_in *) addr)->sin_addr.s_addr; | |
258 | } | |
259 | ||
260 | static int put_rtax(struct nlattr *mx, int len, int type, u32 value) | |
261 | { | |
262 | struct nlattr *nla; | |
263 | ||
264 | nla = (struct nlattr *) ((char *) mx + len); | |
265 | nla->nla_type = type; | |
266 | nla->nla_len = nla_attr_size(4); | |
267 | *(u32 *) nla_data(nla) = value; | |
268 | ||
269 | return len + nla_total_size(4); | |
270 | } | |
271 | ||
272 | static int rtentry_to_fib_config(int cmd, struct rtentry *rt, | |
273 | struct fib_config *cfg) | |
274 | { | |
6d85c10a | 275 | __be32 addr; |
4e902c57 TG |
276 | int plen; |
277 | ||
278 | memset(cfg, 0, sizeof(*cfg)); | |
279 | ||
280 | if (rt->rt_dst.sa_family != AF_INET) | |
281 | return -EAFNOSUPPORT; | |
282 | ||
283 | /* | |
284 | * Check mask for validity: | |
285 | * a) it must be contiguous. | |
286 | * b) destination must have all host bits clear. | |
287 | * c) if application forgot to set correct family (AF_INET), | |
288 | * reject request unless it is absolutely clear i.e. | |
289 | * both family and mask are zero. | |
290 | */ | |
291 | plen = 32; | |
292 | addr = sk_extract_addr(&rt->rt_dst); | |
293 | if (!(rt->rt_flags & RTF_HOST)) { | |
81f7bf6c | 294 | __be32 mask = sk_extract_addr(&rt->rt_genmask); |
4e902c57 TG |
295 | |
296 | if (rt->rt_genmask.sa_family != AF_INET) { | |
297 | if (mask || rt->rt_genmask.sa_family) | |
298 | return -EAFNOSUPPORT; | |
299 | } | |
300 | ||
301 | if (bad_mask(mask, addr)) | |
302 | return -EINVAL; | |
303 | ||
304 | plen = inet_mask_len(mask); | |
305 | } | |
306 | ||
307 | cfg->fc_dst_len = plen; | |
308 | cfg->fc_dst = addr; | |
309 | ||
310 | if (cmd != SIOCDELRT) { | |
311 | cfg->fc_nlflags = NLM_F_CREATE; | |
312 | cfg->fc_protocol = RTPROT_BOOT; | |
313 | } | |
314 | ||
315 | if (rt->rt_metric) | |
316 | cfg->fc_priority = rt->rt_metric - 1; | |
317 | ||
318 | if (rt->rt_flags & RTF_REJECT) { | |
319 | cfg->fc_scope = RT_SCOPE_HOST; | |
320 | cfg->fc_type = RTN_UNREACHABLE; | |
321 | return 0; | |
322 | } | |
323 | ||
324 | cfg->fc_scope = RT_SCOPE_NOWHERE; | |
325 | cfg->fc_type = RTN_UNICAST; | |
326 | ||
327 | if (rt->rt_dev) { | |
328 | char *colon; | |
329 | struct net_device *dev; | |
330 | char devname[IFNAMSIZ]; | |
331 | ||
332 | if (copy_from_user(devname, rt->rt_dev, IFNAMSIZ-1)) | |
333 | return -EFAULT; | |
334 | ||
335 | devname[IFNAMSIZ-1] = 0; | |
336 | colon = strchr(devname, ':'); | |
337 | if (colon) | |
338 | *colon = 0; | |
881d966b | 339 | dev = __dev_get_by_name(&init_net, devname); |
4e902c57 TG |
340 | if (!dev) |
341 | return -ENODEV; | |
342 | cfg->fc_oif = dev->ifindex; | |
343 | if (colon) { | |
344 | struct in_ifaddr *ifa; | |
345 | struct in_device *in_dev = __in_dev_get_rtnl(dev); | |
346 | if (!in_dev) | |
347 | return -ENODEV; | |
348 | *colon = ':'; | |
349 | for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) | |
350 | if (strcmp(ifa->ifa_label, devname) == 0) | |
351 | break; | |
352 | if (ifa == NULL) | |
353 | return -ENODEV; | |
354 | cfg->fc_prefsrc = ifa->ifa_local; | |
355 | } | |
356 | } | |
357 | ||
358 | addr = sk_extract_addr(&rt->rt_gateway); | |
359 | if (rt->rt_gateway.sa_family == AF_INET && addr) { | |
360 | cfg->fc_gw = addr; | |
361 | if (rt->rt_flags & RTF_GATEWAY && | |
362 | inet_addr_type(addr) == RTN_UNICAST) | |
363 | cfg->fc_scope = RT_SCOPE_UNIVERSE; | |
364 | } | |
365 | ||
366 | if (cmd == SIOCDELRT) | |
367 | return 0; | |
368 | ||
369 | if (rt->rt_flags & RTF_GATEWAY && !cfg->fc_gw) | |
370 | return -EINVAL; | |
371 | ||
372 | if (cfg->fc_scope == RT_SCOPE_NOWHERE) | |
373 | cfg->fc_scope = RT_SCOPE_LINK; | |
374 | ||
375 | if (rt->rt_flags & (RTF_MTU | RTF_WINDOW | RTF_IRTT)) { | |
376 | struct nlattr *mx; | |
377 | int len = 0; | |
378 | ||
379 | mx = kzalloc(3 * nla_total_size(4), GFP_KERNEL); | |
e905a9ed | 380 | if (mx == NULL) |
4e902c57 TG |
381 | return -ENOMEM; |
382 | ||
383 | if (rt->rt_flags & RTF_MTU) | |
384 | len = put_rtax(mx, len, RTAX_ADVMSS, rt->rt_mtu - 40); | |
385 | ||
386 | if (rt->rt_flags & RTF_WINDOW) | |
387 | len = put_rtax(mx, len, RTAX_WINDOW, rt->rt_window); | |
388 | ||
389 | if (rt->rt_flags & RTF_IRTT) | |
390 | len = put_rtax(mx, len, RTAX_RTT, rt->rt_irtt << 3); | |
391 | ||
392 | cfg->fc_mx = mx; | |
393 | cfg->fc_mx_len = len; | |
394 | } | |
395 | ||
396 | return 0; | |
397 | } | |
398 | ||
1da177e4 LT |
399 | /* |
400 | * Handle IP routing ioctl calls. These are used to manipulate the routing tables | |
401 | */ | |
e905a9ed | 402 | |
1da177e4 LT |
403 | int ip_rt_ioctl(unsigned int cmd, void __user *arg) |
404 | { | |
4e902c57 TG |
405 | struct fib_config cfg; |
406 | struct rtentry rt; | |
1da177e4 | 407 | int err; |
1da177e4 LT |
408 | |
409 | switch (cmd) { | |
410 | case SIOCADDRT: /* Add a route */ | |
411 | case SIOCDELRT: /* Delete a route */ | |
412 | if (!capable(CAP_NET_ADMIN)) | |
413 | return -EPERM; | |
4e902c57 TG |
414 | |
415 | if (copy_from_user(&rt, arg, sizeof(rt))) | |
1da177e4 | 416 | return -EFAULT; |
4e902c57 | 417 | |
1da177e4 | 418 | rtnl_lock(); |
4e902c57 | 419 | err = rtentry_to_fib_config(cmd, &rt, &cfg); |
1da177e4 | 420 | if (err == 0) { |
4e902c57 TG |
421 | struct fib_table *tb; |
422 | ||
1da177e4 | 423 | if (cmd == SIOCDELRT) { |
4e902c57 | 424 | tb = fib_get_table(cfg.fc_table); |
1da177e4 | 425 | if (tb) |
4e902c57 TG |
426 | err = tb->tb_delete(tb, &cfg); |
427 | else | |
428 | err = -ESRCH; | |
1da177e4 | 429 | } else { |
4e902c57 | 430 | tb = fib_new_table(cfg.fc_table); |
1da177e4 | 431 | if (tb) |
4e902c57 TG |
432 | err = tb->tb_insert(tb, &cfg); |
433 | else | |
434 | err = -ENOBUFS; | |
1da177e4 | 435 | } |
4e902c57 TG |
436 | |
437 | /* allocated by rtentry_to_fib_config() */ | |
438 | kfree(cfg.fc_mx); | |
1da177e4 LT |
439 | } |
440 | rtnl_unlock(); | |
441 | return err; | |
442 | } | |
443 | return -EINVAL; | |
444 | } | |
445 | ||
ef7c79ed | 446 | const struct nla_policy rtm_ipv4_policy[RTA_MAX+1] = { |
4e902c57 TG |
447 | [RTA_DST] = { .type = NLA_U32 }, |
448 | [RTA_SRC] = { .type = NLA_U32 }, | |
449 | [RTA_IIF] = { .type = NLA_U32 }, | |
450 | [RTA_OIF] = { .type = NLA_U32 }, | |
451 | [RTA_GATEWAY] = { .type = NLA_U32 }, | |
452 | [RTA_PRIORITY] = { .type = NLA_U32 }, | |
453 | [RTA_PREFSRC] = { .type = NLA_U32 }, | |
454 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
5176f91e | 455 | [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) }, |
4e902c57 TG |
456 | [RTA_PROTOINFO] = { .type = NLA_U32 }, |
457 | [RTA_FLOW] = { .type = NLA_U32 }, | |
4e902c57 TG |
458 | }; |
459 | ||
460 | static int rtm_to_fib_config(struct sk_buff *skb, struct nlmsghdr *nlh, | |
461 | struct fib_config *cfg) | |
1da177e4 | 462 | { |
4e902c57 TG |
463 | struct nlattr *attr; |
464 | int err, remaining; | |
465 | struct rtmsg *rtm; | |
466 | ||
467 | err = nlmsg_validate(nlh, sizeof(*rtm), RTA_MAX, rtm_ipv4_policy); | |
468 | if (err < 0) | |
469 | goto errout; | |
470 | ||
471 | memset(cfg, 0, sizeof(*cfg)); | |
472 | ||
473 | rtm = nlmsg_data(nlh); | |
4e902c57 | 474 | cfg->fc_dst_len = rtm->rtm_dst_len; |
4e902c57 TG |
475 | cfg->fc_tos = rtm->rtm_tos; |
476 | cfg->fc_table = rtm->rtm_table; | |
477 | cfg->fc_protocol = rtm->rtm_protocol; | |
478 | cfg->fc_scope = rtm->rtm_scope; | |
479 | cfg->fc_type = rtm->rtm_type; | |
480 | cfg->fc_flags = rtm->rtm_flags; | |
481 | cfg->fc_nlflags = nlh->nlmsg_flags; | |
482 | ||
483 | cfg->fc_nlinfo.pid = NETLINK_CB(skb).pid; | |
484 | cfg->fc_nlinfo.nlh = nlh; | |
485 | ||
a0ee18b9 TG |
486 | if (cfg->fc_type > RTN_MAX) { |
487 | err = -EINVAL; | |
488 | goto errout; | |
489 | } | |
490 | ||
4e902c57 | 491 | nlmsg_for_each_attr(attr, nlh, sizeof(struct rtmsg), remaining) { |
8f4c1f9b | 492 | switch (nla_type(attr)) { |
4e902c57 | 493 | case RTA_DST: |
17fb2c64 | 494 | cfg->fc_dst = nla_get_be32(attr); |
4e902c57 | 495 | break; |
4e902c57 TG |
496 | case RTA_OIF: |
497 | cfg->fc_oif = nla_get_u32(attr); | |
498 | break; | |
499 | case RTA_GATEWAY: | |
17fb2c64 | 500 | cfg->fc_gw = nla_get_be32(attr); |
4e902c57 TG |
501 | break; |
502 | case RTA_PRIORITY: | |
503 | cfg->fc_priority = nla_get_u32(attr); | |
504 | break; | |
505 | case RTA_PREFSRC: | |
17fb2c64 | 506 | cfg->fc_prefsrc = nla_get_be32(attr); |
4e902c57 TG |
507 | break; |
508 | case RTA_METRICS: | |
509 | cfg->fc_mx = nla_data(attr); | |
510 | cfg->fc_mx_len = nla_len(attr); | |
511 | break; | |
512 | case RTA_MULTIPATH: | |
513 | cfg->fc_mp = nla_data(attr); | |
514 | cfg->fc_mp_len = nla_len(attr); | |
515 | break; | |
516 | case RTA_FLOW: | |
517 | cfg->fc_flow = nla_get_u32(attr); | |
518 | break; | |
4e902c57 TG |
519 | case RTA_TABLE: |
520 | cfg->fc_table = nla_get_u32(attr); | |
521 | break; | |
1da177e4 LT |
522 | } |
523 | } | |
4e902c57 | 524 | |
1da177e4 | 525 | return 0; |
4e902c57 TG |
526 | errout: |
527 | return err; | |
1da177e4 LT |
528 | } |
529 | ||
63f3444f | 530 | static int inet_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 531 | { |
4e902c57 TG |
532 | struct fib_config cfg; |
533 | struct fib_table *tb; | |
534 | int err; | |
1da177e4 | 535 | |
4e902c57 TG |
536 | err = rtm_to_fib_config(skb, nlh, &cfg); |
537 | if (err < 0) | |
538 | goto errout; | |
1da177e4 | 539 | |
4e902c57 TG |
540 | tb = fib_get_table(cfg.fc_table); |
541 | if (tb == NULL) { | |
542 | err = -ESRCH; | |
543 | goto errout; | |
544 | } | |
545 | ||
546 | err = tb->tb_delete(tb, &cfg); | |
547 | errout: | |
548 | return err; | |
1da177e4 LT |
549 | } |
550 | ||
63f3444f | 551 | static int inet_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 552 | { |
4e902c57 TG |
553 | struct fib_config cfg; |
554 | struct fib_table *tb; | |
555 | int err; | |
1da177e4 | 556 | |
4e902c57 TG |
557 | err = rtm_to_fib_config(skb, nlh, &cfg); |
558 | if (err < 0) | |
559 | goto errout; | |
1da177e4 | 560 | |
4e902c57 TG |
561 | tb = fib_new_table(cfg.fc_table); |
562 | if (tb == NULL) { | |
563 | err = -ENOBUFS; | |
564 | goto errout; | |
565 | } | |
566 | ||
567 | err = tb->tb_insert(tb, &cfg); | |
568 | errout: | |
569 | return err; | |
1da177e4 LT |
570 | } |
571 | ||
63f3444f | 572 | static int inet_dump_fib(struct sk_buff *skb, struct netlink_callback *cb) |
1da177e4 | 573 | { |
1af5a8c4 PM |
574 | unsigned int h, s_h; |
575 | unsigned int e = 0, s_e; | |
1da177e4 | 576 | struct fib_table *tb; |
1af5a8c4 PM |
577 | struct hlist_node *node; |
578 | int dumped = 0; | |
1da177e4 | 579 | |
be403ea1 TG |
580 | if (nlmsg_len(cb->nlh) >= sizeof(struct rtmsg) && |
581 | ((struct rtmsg *) nlmsg_data(cb->nlh))->rtm_flags & RTM_F_CLONED) | |
1da177e4 LT |
582 | return ip_rt_dump(skb, cb); |
583 | ||
1af5a8c4 PM |
584 | s_h = cb->args[0]; |
585 | s_e = cb->args[1]; | |
586 | ||
587 | for (h = s_h; h < FIB_TABLE_HASHSZ; h++, s_e = 0) { | |
588 | e = 0; | |
589 | hlist_for_each_entry(tb, node, &fib_table_hash[h], tb_hlist) { | |
590 | if (e < s_e) | |
591 | goto next; | |
592 | if (dumped) | |
593 | memset(&cb->args[2], 0, sizeof(cb->args) - | |
e905a9ed | 594 | 2 * sizeof(cb->args[0])); |
1af5a8c4 PM |
595 | if (tb->tb_dump(tb, skb, cb) < 0) |
596 | goto out; | |
597 | dumped = 1; | |
598 | next: | |
599 | e++; | |
600 | } | |
1da177e4 | 601 | } |
1af5a8c4 PM |
602 | out: |
603 | cb->args[1] = e; | |
604 | cb->args[0] = h; | |
1da177e4 LT |
605 | |
606 | return skb->len; | |
607 | } | |
608 | ||
609 | /* Prepare and feed intra-kernel routing request. | |
610 | Really, it should be netlink message, but :-( netlink | |
611 | can be not configured, so that we feed it directly | |
612 | to fib engine. It is legal, because all events occur | |
613 | only when netlink is already locked. | |
614 | */ | |
615 | ||
81f7bf6c | 616 | static void fib_magic(int cmd, int type, __be32 dst, int dst_len, struct in_ifaddr *ifa) |
1da177e4 | 617 | { |
4e902c57 TG |
618 | struct fib_table *tb; |
619 | struct fib_config cfg = { | |
620 | .fc_protocol = RTPROT_KERNEL, | |
621 | .fc_type = type, | |
622 | .fc_dst = dst, | |
623 | .fc_dst_len = dst_len, | |
624 | .fc_prefsrc = ifa->ifa_local, | |
625 | .fc_oif = ifa->ifa_dev->dev->ifindex, | |
626 | .fc_nlflags = NLM_F_CREATE | NLM_F_APPEND, | |
627 | }; | |
1da177e4 LT |
628 | |
629 | if (type == RTN_UNICAST) | |
630 | tb = fib_new_table(RT_TABLE_MAIN); | |
631 | else | |
632 | tb = fib_new_table(RT_TABLE_LOCAL); | |
633 | ||
634 | if (tb == NULL) | |
635 | return; | |
636 | ||
4e902c57 | 637 | cfg.fc_table = tb->tb_id; |
1da177e4 | 638 | |
4e902c57 TG |
639 | if (type != RTN_LOCAL) |
640 | cfg.fc_scope = RT_SCOPE_LINK; | |
641 | else | |
642 | cfg.fc_scope = RT_SCOPE_HOST; | |
1da177e4 LT |
643 | |
644 | if (cmd == RTM_NEWROUTE) | |
4e902c57 | 645 | tb->tb_insert(tb, &cfg); |
1da177e4 | 646 | else |
4e902c57 | 647 | tb->tb_delete(tb, &cfg); |
1da177e4 LT |
648 | } |
649 | ||
0ff60a45 | 650 | void fib_add_ifaddr(struct in_ifaddr *ifa) |
1da177e4 LT |
651 | { |
652 | struct in_device *in_dev = ifa->ifa_dev; | |
653 | struct net_device *dev = in_dev->dev; | |
654 | struct in_ifaddr *prim = ifa; | |
a144ea4b AV |
655 | __be32 mask = ifa->ifa_mask; |
656 | __be32 addr = ifa->ifa_local; | |
657 | __be32 prefix = ifa->ifa_address&mask; | |
1da177e4 LT |
658 | |
659 | if (ifa->ifa_flags&IFA_F_SECONDARY) { | |
660 | prim = inet_ifa_byprefix(in_dev, prefix, mask); | |
661 | if (prim == NULL) { | |
662 | printk(KERN_DEBUG "fib_add_ifaddr: bug: prim == NULL\n"); | |
663 | return; | |
664 | } | |
665 | } | |
666 | ||
667 | fib_magic(RTM_NEWROUTE, RTN_LOCAL, addr, 32, prim); | |
668 | ||
669 | if (!(dev->flags&IFF_UP)) | |
670 | return; | |
671 | ||
672 | /* Add broadcast address, if it is explicitly assigned. */ | |
a144ea4b | 673 | if (ifa->ifa_broadcast && ifa->ifa_broadcast != htonl(0xFFFFFFFF)) |
1da177e4 LT |
674 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim); |
675 | ||
676 | if (!ZERONET(prefix) && !(ifa->ifa_flags&IFA_F_SECONDARY) && | |
677 | (prefix != addr || ifa->ifa_prefixlen < 32)) { | |
678 | fib_magic(RTM_NEWROUTE, dev->flags&IFF_LOOPBACK ? RTN_LOCAL : | |
679 | RTN_UNICAST, prefix, ifa->ifa_prefixlen, prim); | |
680 | ||
681 | /* Add network specific broadcasts, when it takes a sense */ | |
682 | if (ifa->ifa_prefixlen < 31) { | |
683 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix, 32, prim); | |
684 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix|~mask, 32, prim); | |
685 | } | |
686 | } | |
687 | } | |
688 | ||
689 | static void fib_del_ifaddr(struct in_ifaddr *ifa) | |
690 | { | |
691 | struct in_device *in_dev = ifa->ifa_dev; | |
692 | struct net_device *dev = in_dev->dev; | |
693 | struct in_ifaddr *ifa1; | |
694 | struct in_ifaddr *prim = ifa; | |
a144ea4b AV |
695 | __be32 brd = ifa->ifa_address|~ifa->ifa_mask; |
696 | __be32 any = ifa->ifa_address&ifa->ifa_mask; | |
1da177e4 LT |
697 | #define LOCAL_OK 1 |
698 | #define BRD_OK 2 | |
699 | #define BRD0_OK 4 | |
700 | #define BRD1_OK 8 | |
701 | unsigned ok = 0; | |
702 | ||
703 | if (!(ifa->ifa_flags&IFA_F_SECONDARY)) | |
704 | fib_magic(RTM_DELROUTE, dev->flags&IFF_LOOPBACK ? RTN_LOCAL : | |
705 | RTN_UNICAST, any, ifa->ifa_prefixlen, prim); | |
706 | else { | |
707 | prim = inet_ifa_byprefix(in_dev, any, ifa->ifa_mask); | |
708 | if (prim == NULL) { | |
709 | printk(KERN_DEBUG "fib_del_ifaddr: bug: prim == NULL\n"); | |
710 | return; | |
711 | } | |
712 | } | |
713 | ||
714 | /* Deletion is more complicated than add. | |
715 | We should take care of not to delete too much :-) | |
716 | ||
717 | Scan address list to be sure that addresses are really gone. | |
718 | */ | |
719 | ||
720 | for (ifa1 = in_dev->ifa_list; ifa1; ifa1 = ifa1->ifa_next) { | |
721 | if (ifa->ifa_local == ifa1->ifa_local) | |
722 | ok |= LOCAL_OK; | |
723 | if (ifa->ifa_broadcast == ifa1->ifa_broadcast) | |
724 | ok |= BRD_OK; | |
725 | if (brd == ifa1->ifa_broadcast) | |
726 | ok |= BRD1_OK; | |
727 | if (any == ifa1->ifa_broadcast) | |
728 | ok |= BRD0_OK; | |
729 | } | |
730 | ||
731 | if (!(ok&BRD_OK)) | |
732 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim); | |
733 | if (!(ok&BRD1_OK)) | |
734 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, brd, 32, prim); | |
735 | if (!(ok&BRD0_OK)) | |
736 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, any, 32, prim); | |
737 | if (!(ok&LOCAL_OK)) { | |
738 | fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 32, prim); | |
739 | ||
740 | /* Check, that this local address finally disappeared. */ | |
741 | if (inet_addr_type(ifa->ifa_local) != RTN_LOCAL) { | |
742 | /* And the last, but not the least thing. | |
743 | We must flush stray FIB entries. | |
744 | ||
745 | First of all, we scan fib_info list searching | |
746 | for stray nexthop entries, then ignite fib_flush. | |
747 | */ | |
748 | if (fib_sync_down(ifa->ifa_local, NULL, 0)) | |
749 | fib_flush(); | |
750 | } | |
751 | } | |
752 | #undef LOCAL_OK | |
753 | #undef BRD_OK | |
754 | #undef BRD0_OK | |
755 | #undef BRD1_OK | |
756 | } | |
757 | ||
246955fe RO |
758 | static void nl_fib_lookup(struct fib_result_nl *frn, struct fib_table *tb ) |
759 | { | |
e905a9ed | 760 | |
246955fe | 761 | struct fib_result res; |
5f300893 | 762 | struct flowi fl = { .mark = frn->fl_mark, |
47dcf0cb | 763 | .nl_u = { .ip4_u = { .daddr = frn->fl_addr, |
246955fe RO |
764 | .tos = frn->fl_tos, |
765 | .scope = frn->fl_scope } } }; | |
1194ed0a | 766 | |
912a41a4 SV |
767 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
768 | res.r = NULL; | |
769 | #endif | |
770 | ||
1194ed0a | 771 | frn->err = -ENOENT; |
246955fe RO |
772 | if (tb) { |
773 | local_bh_disable(); | |
774 | ||
775 | frn->tb_id = tb->tb_id; | |
776 | frn->err = tb->tb_lookup(tb, &fl, &res); | |
777 | ||
778 | if (!frn->err) { | |
779 | frn->prefixlen = res.prefixlen; | |
780 | frn->nh_sel = res.nh_sel; | |
781 | frn->type = res.type; | |
782 | frn->scope = res.scope; | |
1194ed0a | 783 | fib_res_put(&res); |
246955fe RO |
784 | } |
785 | local_bh_enable(); | |
786 | } | |
787 | } | |
788 | ||
28f7b036 | 789 | static void nl_fib_input(struct sk_buff *skb) |
246955fe | 790 | { |
246955fe | 791 | struct fib_result_nl *frn; |
28f7b036 | 792 | struct nlmsghdr *nlh; |
246955fe | 793 | struct fib_table *tb; |
28f7b036 | 794 | u32 pid; |
1194ed0a | 795 | |
b529ccf2 | 796 | nlh = nlmsg_hdr(skb); |
ea86575e TG |
797 | if (skb->len < NLMSG_SPACE(0) || skb->len < nlh->nlmsg_len || |
798 | nlh->nlmsg_len < NLMSG_LENGTH(sizeof(*frn))) { | |
799 | kfree_skb(skb); | |
800 | return; | |
801 | } | |
e905a9ed | 802 | |
246955fe RO |
803 | frn = (struct fib_result_nl *) NLMSG_DATA(nlh); |
804 | tb = fib_get_table(frn->tb_id_in); | |
805 | ||
806 | nl_fib_lookup(frn, tb); | |
e905a9ed | 807 | |
1194ed0a | 808 | pid = NETLINK_CB(skb).pid; /* pid of sending process */ |
246955fe | 809 | NETLINK_CB(skb).pid = 0; /* from kernel */ |
ac6d439d | 810 | NETLINK_CB(skb).dst_group = 0; /* unicast */ |
cd40b7d3 | 811 | netlink_unicast(fibnl, skb, pid, MSG_DONTWAIT); |
e905a9ed | 812 | } |
246955fe RO |
813 | |
814 | static void nl_fib_lookup_init(void) | |
815 | { | |
cd40b7d3 DL |
816 | fibnl = netlink_kernel_create(&init_net, NETLINK_FIB_LOOKUP, 0, |
817 | nl_fib_input, NULL, THIS_MODULE); | |
246955fe RO |
818 | } |
819 | ||
1da177e4 LT |
820 | static void fib_disable_ip(struct net_device *dev, int force) |
821 | { | |
822 | if (fib_sync_down(0, dev, force)) | |
823 | fib_flush(); | |
824 | rt_cache_flush(0); | |
825 | arp_ifdown(dev); | |
826 | } | |
827 | ||
828 | static int fib_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr) | |
829 | { | |
830 | struct in_ifaddr *ifa = (struct in_ifaddr*)ptr; | |
831 | ||
832 | switch (event) { | |
833 | case NETDEV_UP: | |
834 | fib_add_ifaddr(ifa); | |
835 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
836 | fib_sync_up(ifa->ifa_dev->dev); | |
837 | #endif | |
838 | rt_cache_flush(-1); | |
839 | break; | |
840 | case NETDEV_DOWN: | |
841 | fib_del_ifaddr(ifa); | |
9fcc2e8a | 842 | if (ifa->ifa_dev->ifa_list == NULL) { |
1da177e4 LT |
843 | /* Last address was deleted from this interface. |
844 | Disable IP. | |
845 | */ | |
846 | fib_disable_ip(ifa->ifa_dev->dev, 1); | |
847 | } else { | |
848 | rt_cache_flush(-1); | |
849 | } | |
850 | break; | |
851 | } | |
852 | return NOTIFY_DONE; | |
853 | } | |
854 | ||
855 | static int fib_netdev_event(struct notifier_block *this, unsigned long event, void *ptr) | |
856 | { | |
857 | struct net_device *dev = ptr; | |
e5ed6399 | 858 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
1da177e4 | 859 | |
e9dc8653 EB |
860 | if (dev->nd_net != &init_net) |
861 | return NOTIFY_DONE; | |
862 | ||
1da177e4 LT |
863 | if (event == NETDEV_UNREGISTER) { |
864 | fib_disable_ip(dev, 2); | |
865 | return NOTIFY_DONE; | |
866 | } | |
867 | ||
868 | if (!in_dev) | |
869 | return NOTIFY_DONE; | |
870 | ||
871 | switch (event) { | |
872 | case NETDEV_UP: | |
873 | for_ifa(in_dev) { | |
874 | fib_add_ifaddr(ifa); | |
875 | } endfor_ifa(in_dev); | |
876 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
877 | fib_sync_up(dev); | |
878 | #endif | |
879 | rt_cache_flush(-1); | |
880 | break; | |
881 | case NETDEV_DOWN: | |
882 | fib_disable_ip(dev, 0); | |
883 | break; | |
884 | case NETDEV_CHANGEMTU: | |
885 | case NETDEV_CHANGE: | |
886 | rt_cache_flush(0); | |
887 | break; | |
888 | } | |
889 | return NOTIFY_DONE; | |
890 | } | |
891 | ||
892 | static struct notifier_block fib_inetaddr_notifier = { | |
893 | .notifier_call =fib_inetaddr_event, | |
894 | }; | |
895 | ||
896 | static struct notifier_block fib_netdev_notifier = { | |
897 | .notifier_call =fib_netdev_event, | |
898 | }; | |
899 | ||
900 | void __init ip_fib_init(void) | |
901 | { | |
1af5a8c4 PM |
902 | unsigned int i; |
903 | ||
904 | for (i = 0; i < FIB_TABLE_HASHSZ; i++) | |
905 | INIT_HLIST_HEAD(&fib_table_hash[i]); | |
1da177e4 LT |
906 | #ifndef CONFIG_IP_MULTIPLE_TABLES |
907 | ip_fib_local_table = fib_hash_init(RT_TABLE_LOCAL); | |
1af5a8c4 | 908 | hlist_add_head_rcu(&ip_fib_local_table->tb_hlist, &fib_table_hash[0]); |
1da177e4 | 909 | ip_fib_main_table = fib_hash_init(RT_TABLE_MAIN); |
1af5a8c4 | 910 | hlist_add_head_rcu(&ip_fib_main_table->tb_hlist, &fib_table_hash[0]); |
1da177e4 | 911 | #else |
e1ef4bf2 | 912 | fib4_rules_init(); |
1da177e4 LT |
913 | #endif |
914 | ||
915 | register_netdevice_notifier(&fib_netdev_notifier); | |
916 | register_inetaddr_notifier(&fib_inetaddr_notifier); | |
246955fe | 917 | nl_fib_lookup_init(); |
63f3444f TG |
918 | |
919 | rtnl_register(PF_INET, RTM_NEWROUTE, inet_rtm_newroute, NULL); | |
920 | rtnl_register(PF_INET, RTM_DELROUTE, inet_rtm_delroute, NULL); | |
921 | rtnl_register(PF_INET, RTM_GETROUTE, NULL, inet_dump_fib); | |
1da177e4 LT |
922 | } |
923 | ||
924 | EXPORT_SYMBOL(inet_addr_type); | |
a1e8733e | 925 | EXPORT_SYMBOL(ip_dev_find); |