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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; | |
03cf786c | 131 | struct fib_table *local_table; |
1da177e4 LT |
132 | |
133 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
134 | res.r = NULL; | |
135 | #endif | |
136 | ||
03cf786c PE |
137 | local_table = fib_get_table(RT_TABLE_LOCAL); |
138 | if (!local_table || local_table->tb_lookup(local_table, &fl, &res)) | |
1da177e4 LT |
139 | return NULL; |
140 | if (res.type != RTN_LOCAL) | |
141 | goto out; | |
142 | dev = FIB_RES_DEV(res); | |
143 | ||
144 | if (dev) | |
145 | dev_hold(dev); | |
146 | out: | |
147 | fib_res_put(&res); | |
148 | return dev; | |
149 | } | |
150 | ||
fd683222 | 151 | unsigned inet_addr_type(__be32 addr) |
1da177e4 LT |
152 | { |
153 | struct flowi fl = { .nl_u = { .ip4_u = { .daddr = addr } } }; | |
154 | struct fib_result res; | |
155 | unsigned ret = RTN_BROADCAST; | |
03cf786c | 156 | struct fib_table *local_table; |
1da177e4 LT |
157 | |
158 | if (ZERONET(addr) || BADCLASS(addr)) | |
159 | return RTN_BROADCAST; | |
160 | if (MULTICAST(addr)) | |
161 | return RTN_MULTICAST; | |
162 | ||
163 | #ifdef CONFIG_IP_MULTIPLE_TABLES | |
164 | res.r = NULL; | |
165 | #endif | |
e905a9ed | 166 | |
03cf786c PE |
167 | local_table = fib_get_table(RT_TABLE_LOCAL); |
168 | if (local_table) { | |
1da177e4 | 169 | ret = RTN_UNICAST; |
03cf786c | 170 | if (!local_table->tb_lookup(local_table, &fl, &res)) { |
1da177e4 LT |
171 | ret = res.type; |
172 | fib_res_put(&res); | |
173 | } | |
174 | } | |
175 | return ret; | |
176 | } | |
177 | ||
178 | /* Given (packet source, input interface) and optional (dst, oif, tos): | |
179 | - (main) check, that source is valid i.e. not broadcast or our local | |
180 | address. | |
181 | - figure out what "logical" interface this packet arrived | |
182 | and calculate "specific destination" address. | |
183 | - check, that packet arrived from expected physical interface. | |
184 | */ | |
185 | ||
d9c9df8c AV |
186 | int fib_validate_source(__be32 src, __be32 dst, u8 tos, int oif, |
187 | struct net_device *dev, __be32 *spec_dst, u32 *itag) | |
1da177e4 LT |
188 | { |
189 | struct in_device *in_dev; | |
190 | struct flowi fl = { .nl_u = { .ip4_u = | |
191 | { .daddr = src, | |
192 | .saddr = dst, | |
193 | .tos = tos } }, | |
194 | .iif = oif }; | |
195 | struct fib_result res; | |
196 | int no_addr, rpf; | |
197 | int ret; | |
198 | ||
199 | no_addr = rpf = 0; | |
200 | rcu_read_lock(); | |
e5ed6399 | 201 | in_dev = __in_dev_get_rcu(dev); |
1da177e4 LT |
202 | if (in_dev) { |
203 | no_addr = in_dev->ifa_list == NULL; | |
204 | rpf = IN_DEV_RPFILTER(in_dev); | |
205 | } | |
206 | rcu_read_unlock(); | |
207 | ||
208 | if (in_dev == NULL) | |
209 | goto e_inval; | |
210 | ||
211 | if (fib_lookup(&fl, &res)) | |
212 | goto last_resort; | |
213 | if (res.type != RTN_UNICAST) | |
214 | goto e_inval_res; | |
215 | *spec_dst = FIB_RES_PREFSRC(res); | |
216 | fib_combine_itag(itag, &res); | |
217 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
218 | if (FIB_RES_DEV(res) == dev || res.fi->fib_nhs > 1) | |
219 | #else | |
220 | if (FIB_RES_DEV(res) == dev) | |
221 | #endif | |
222 | { | |
223 | ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST; | |
224 | fib_res_put(&res); | |
225 | return ret; | |
226 | } | |
227 | fib_res_put(&res); | |
228 | if (no_addr) | |
229 | goto last_resort; | |
230 | if (rpf) | |
231 | goto e_inval; | |
232 | fl.oif = dev->ifindex; | |
233 | ||
234 | ret = 0; | |
235 | if (fib_lookup(&fl, &res) == 0) { | |
236 | if (res.type == RTN_UNICAST) { | |
237 | *spec_dst = FIB_RES_PREFSRC(res); | |
238 | ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST; | |
239 | } | |
240 | fib_res_put(&res); | |
241 | } | |
242 | return ret; | |
243 | ||
244 | last_resort: | |
245 | if (rpf) | |
246 | goto e_inval; | |
247 | *spec_dst = inet_select_addr(dev, 0, RT_SCOPE_UNIVERSE); | |
248 | *itag = 0; | |
249 | return 0; | |
250 | ||
251 | e_inval_res: | |
252 | fib_res_put(&res); | |
253 | e_inval: | |
254 | return -EINVAL; | |
255 | } | |
256 | ||
81f7bf6c | 257 | static inline __be32 sk_extract_addr(struct sockaddr *addr) |
4e902c57 TG |
258 | { |
259 | return ((struct sockaddr_in *) addr)->sin_addr.s_addr; | |
260 | } | |
261 | ||
262 | static int put_rtax(struct nlattr *mx, int len, int type, u32 value) | |
263 | { | |
264 | struct nlattr *nla; | |
265 | ||
266 | nla = (struct nlattr *) ((char *) mx + len); | |
267 | nla->nla_type = type; | |
268 | nla->nla_len = nla_attr_size(4); | |
269 | *(u32 *) nla_data(nla) = value; | |
270 | ||
271 | return len + nla_total_size(4); | |
272 | } | |
273 | ||
274 | static int rtentry_to_fib_config(int cmd, struct rtentry *rt, | |
275 | struct fib_config *cfg) | |
276 | { | |
6d85c10a | 277 | __be32 addr; |
4e902c57 TG |
278 | int plen; |
279 | ||
280 | memset(cfg, 0, sizeof(*cfg)); | |
281 | ||
282 | if (rt->rt_dst.sa_family != AF_INET) | |
283 | return -EAFNOSUPPORT; | |
284 | ||
285 | /* | |
286 | * Check mask for validity: | |
287 | * a) it must be contiguous. | |
288 | * b) destination must have all host bits clear. | |
289 | * c) if application forgot to set correct family (AF_INET), | |
290 | * reject request unless it is absolutely clear i.e. | |
291 | * both family and mask are zero. | |
292 | */ | |
293 | plen = 32; | |
294 | addr = sk_extract_addr(&rt->rt_dst); | |
295 | if (!(rt->rt_flags & RTF_HOST)) { | |
81f7bf6c | 296 | __be32 mask = sk_extract_addr(&rt->rt_genmask); |
4e902c57 TG |
297 | |
298 | if (rt->rt_genmask.sa_family != AF_INET) { | |
299 | if (mask || rt->rt_genmask.sa_family) | |
300 | return -EAFNOSUPPORT; | |
301 | } | |
302 | ||
303 | if (bad_mask(mask, addr)) | |
304 | return -EINVAL; | |
305 | ||
306 | plen = inet_mask_len(mask); | |
307 | } | |
308 | ||
309 | cfg->fc_dst_len = plen; | |
310 | cfg->fc_dst = addr; | |
311 | ||
312 | if (cmd != SIOCDELRT) { | |
313 | cfg->fc_nlflags = NLM_F_CREATE; | |
314 | cfg->fc_protocol = RTPROT_BOOT; | |
315 | } | |
316 | ||
317 | if (rt->rt_metric) | |
318 | cfg->fc_priority = rt->rt_metric - 1; | |
319 | ||
320 | if (rt->rt_flags & RTF_REJECT) { | |
321 | cfg->fc_scope = RT_SCOPE_HOST; | |
322 | cfg->fc_type = RTN_UNREACHABLE; | |
323 | return 0; | |
324 | } | |
325 | ||
326 | cfg->fc_scope = RT_SCOPE_NOWHERE; | |
327 | cfg->fc_type = RTN_UNICAST; | |
328 | ||
329 | if (rt->rt_dev) { | |
330 | char *colon; | |
331 | struct net_device *dev; | |
332 | char devname[IFNAMSIZ]; | |
333 | ||
334 | if (copy_from_user(devname, rt->rt_dev, IFNAMSIZ-1)) | |
335 | return -EFAULT; | |
336 | ||
337 | devname[IFNAMSIZ-1] = 0; | |
338 | colon = strchr(devname, ':'); | |
339 | if (colon) | |
340 | *colon = 0; | |
881d966b | 341 | dev = __dev_get_by_name(&init_net, devname); |
4e902c57 TG |
342 | if (!dev) |
343 | return -ENODEV; | |
344 | cfg->fc_oif = dev->ifindex; | |
345 | if (colon) { | |
346 | struct in_ifaddr *ifa; | |
347 | struct in_device *in_dev = __in_dev_get_rtnl(dev); | |
348 | if (!in_dev) | |
349 | return -ENODEV; | |
350 | *colon = ':'; | |
351 | for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) | |
352 | if (strcmp(ifa->ifa_label, devname) == 0) | |
353 | break; | |
354 | if (ifa == NULL) | |
355 | return -ENODEV; | |
356 | cfg->fc_prefsrc = ifa->ifa_local; | |
357 | } | |
358 | } | |
359 | ||
360 | addr = sk_extract_addr(&rt->rt_gateway); | |
361 | if (rt->rt_gateway.sa_family == AF_INET && addr) { | |
362 | cfg->fc_gw = addr; | |
363 | if (rt->rt_flags & RTF_GATEWAY && | |
364 | inet_addr_type(addr) == RTN_UNICAST) | |
365 | cfg->fc_scope = RT_SCOPE_UNIVERSE; | |
366 | } | |
367 | ||
368 | if (cmd == SIOCDELRT) | |
369 | return 0; | |
370 | ||
371 | if (rt->rt_flags & RTF_GATEWAY && !cfg->fc_gw) | |
372 | return -EINVAL; | |
373 | ||
374 | if (cfg->fc_scope == RT_SCOPE_NOWHERE) | |
375 | cfg->fc_scope = RT_SCOPE_LINK; | |
376 | ||
377 | if (rt->rt_flags & (RTF_MTU | RTF_WINDOW | RTF_IRTT)) { | |
378 | struct nlattr *mx; | |
379 | int len = 0; | |
380 | ||
381 | mx = kzalloc(3 * nla_total_size(4), GFP_KERNEL); | |
e905a9ed | 382 | if (mx == NULL) |
4e902c57 TG |
383 | return -ENOMEM; |
384 | ||
385 | if (rt->rt_flags & RTF_MTU) | |
386 | len = put_rtax(mx, len, RTAX_ADVMSS, rt->rt_mtu - 40); | |
387 | ||
388 | if (rt->rt_flags & RTF_WINDOW) | |
389 | len = put_rtax(mx, len, RTAX_WINDOW, rt->rt_window); | |
390 | ||
391 | if (rt->rt_flags & RTF_IRTT) | |
392 | len = put_rtax(mx, len, RTAX_RTT, rt->rt_irtt << 3); | |
393 | ||
394 | cfg->fc_mx = mx; | |
395 | cfg->fc_mx_len = len; | |
396 | } | |
397 | ||
398 | return 0; | |
399 | } | |
400 | ||
1da177e4 LT |
401 | /* |
402 | * Handle IP routing ioctl calls. These are used to manipulate the routing tables | |
403 | */ | |
e905a9ed | 404 | |
1da177e4 LT |
405 | int ip_rt_ioctl(unsigned int cmd, void __user *arg) |
406 | { | |
4e902c57 TG |
407 | struct fib_config cfg; |
408 | struct rtentry rt; | |
1da177e4 | 409 | int err; |
1da177e4 LT |
410 | |
411 | switch (cmd) { | |
412 | case SIOCADDRT: /* Add a route */ | |
413 | case SIOCDELRT: /* Delete a route */ | |
414 | if (!capable(CAP_NET_ADMIN)) | |
415 | return -EPERM; | |
4e902c57 TG |
416 | |
417 | if (copy_from_user(&rt, arg, sizeof(rt))) | |
1da177e4 | 418 | return -EFAULT; |
4e902c57 | 419 | |
1da177e4 | 420 | rtnl_lock(); |
4e902c57 | 421 | err = rtentry_to_fib_config(cmd, &rt, &cfg); |
1da177e4 | 422 | if (err == 0) { |
4e902c57 TG |
423 | struct fib_table *tb; |
424 | ||
1da177e4 | 425 | if (cmd == SIOCDELRT) { |
4e902c57 | 426 | tb = fib_get_table(cfg.fc_table); |
1da177e4 | 427 | if (tb) |
4e902c57 TG |
428 | err = tb->tb_delete(tb, &cfg); |
429 | else | |
430 | err = -ESRCH; | |
1da177e4 | 431 | } else { |
4e902c57 | 432 | tb = fib_new_table(cfg.fc_table); |
1da177e4 | 433 | if (tb) |
4e902c57 TG |
434 | err = tb->tb_insert(tb, &cfg); |
435 | else | |
436 | err = -ENOBUFS; | |
1da177e4 | 437 | } |
4e902c57 TG |
438 | |
439 | /* allocated by rtentry_to_fib_config() */ | |
440 | kfree(cfg.fc_mx); | |
1da177e4 LT |
441 | } |
442 | rtnl_unlock(); | |
443 | return err; | |
444 | } | |
445 | return -EINVAL; | |
446 | } | |
447 | ||
ef7c79ed | 448 | const struct nla_policy rtm_ipv4_policy[RTA_MAX+1] = { |
4e902c57 TG |
449 | [RTA_DST] = { .type = NLA_U32 }, |
450 | [RTA_SRC] = { .type = NLA_U32 }, | |
451 | [RTA_IIF] = { .type = NLA_U32 }, | |
452 | [RTA_OIF] = { .type = NLA_U32 }, | |
453 | [RTA_GATEWAY] = { .type = NLA_U32 }, | |
454 | [RTA_PRIORITY] = { .type = NLA_U32 }, | |
455 | [RTA_PREFSRC] = { .type = NLA_U32 }, | |
456 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
5176f91e | 457 | [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) }, |
4e902c57 TG |
458 | [RTA_PROTOINFO] = { .type = NLA_U32 }, |
459 | [RTA_FLOW] = { .type = NLA_U32 }, | |
4e902c57 TG |
460 | }; |
461 | ||
462 | static int rtm_to_fib_config(struct sk_buff *skb, struct nlmsghdr *nlh, | |
463 | struct fib_config *cfg) | |
1da177e4 | 464 | { |
4e902c57 TG |
465 | struct nlattr *attr; |
466 | int err, remaining; | |
467 | struct rtmsg *rtm; | |
468 | ||
469 | err = nlmsg_validate(nlh, sizeof(*rtm), RTA_MAX, rtm_ipv4_policy); | |
470 | if (err < 0) | |
471 | goto errout; | |
472 | ||
473 | memset(cfg, 0, sizeof(*cfg)); | |
474 | ||
475 | rtm = nlmsg_data(nlh); | |
4e902c57 | 476 | cfg->fc_dst_len = rtm->rtm_dst_len; |
4e902c57 TG |
477 | cfg->fc_tos = rtm->rtm_tos; |
478 | cfg->fc_table = rtm->rtm_table; | |
479 | cfg->fc_protocol = rtm->rtm_protocol; | |
480 | cfg->fc_scope = rtm->rtm_scope; | |
481 | cfg->fc_type = rtm->rtm_type; | |
482 | cfg->fc_flags = rtm->rtm_flags; | |
483 | cfg->fc_nlflags = nlh->nlmsg_flags; | |
484 | ||
485 | cfg->fc_nlinfo.pid = NETLINK_CB(skb).pid; | |
486 | cfg->fc_nlinfo.nlh = nlh; | |
487 | ||
a0ee18b9 TG |
488 | if (cfg->fc_type > RTN_MAX) { |
489 | err = -EINVAL; | |
490 | goto errout; | |
491 | } | |
492 | ||
4e902c57 | 493 | nlmsg_for_each_attr(attr, nlh, sizeof(struct rtmsg), remaining) { |
8f4c1f9b | 494 | switch (nla_type(attr)) { |
4e902c57 | 495 | case RTA_DST: |
17fb2c64 | 496 | cfg->fc_dst = nla_get_be32(attr); |
4e902c57 | 497 | break; |
4e902c57 TG |
498 | case RTA_OIF: |
499 | cfg->fc_oif = nla_get_u32(attr); | |
500 | break; | |
501 | case RTA_GATEWAY: | |
17fb2c64 | 502 | cfg->fc_gw = nla_get_be32(attr); |
4e902c57 TG |
503 | break; |
504 | case RTA_PRIORITY: | |
505 | cfg->fc_priority = nla_get_u32(attr); | |
506 | break; | |
507 | case RTA_PREFSRC: | |
17fb2c64 | 508 | cfg->fc_prefsrc = nla_get_be32(attr); |
4e902c57 TG |
509 | break; |
510 | case RTA_METRICS: | |
511 | cfg->fc_mx = nla_data(attr); | |
512 | cfg->fc_mx_len = nla_len(attr); | |
513 | break; | |
514 | case RTA_MULTIPATH: | |
515 | cfg->fc_mp = nla_data(attr); | |
516 | cfg->fc_mp_len = nla_len(attr); | |
517 | break; | |
518 | case RTA_FLOW: | |
519 | cfg->fc_flow = nla_get_u32(attr); | |
520 | break; | |
4e902c57 TG |
521 | case RTA_TABLE: |
522 | cfg->fc_table = nla_get_u32(attr); | |
523 | break; | |
1da177e4 LT |
524 | } |
525 | } | |
4e902c57 | 526 | |
1da177e4 | 527 | return 0; |
4e902c57 TG |
528 | errout: |
529 | return err; | |
1da177e4 LT |
530 | } |
531 | ||
63f3444f | 532 | static int inet_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 533 | { |
4e902c57 TG |
534 | struct fib_config cfg; |
535 | struct fib_table *tb; | |
536 | int err; | |
1da177e4 | 537 | |
4e902c57 TG |
538 | err = rtm_to_fib_config(skb, nlh, &cfg); |
539 | if (err < 0) | |
540 | goto errout; | |
1da177e4 | 541 | |
4e902c57 TG |
542 | tb = fib_get_table(cfg.fc_table); |
543 | if (tb == NULL) { | |
544 | err = -ESRCH; | |
545 | goto errout; | |
546 | } | |
547 | ||
548 | err = tb->tb_delete(tb, &cfg); | |
549 | errout: | |
550 | return err; | |
1da177e4 LT |
551 | } |
552 | ||
63f3444f | 553 | static int inet_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 554 | { |
4e902c57 TG |
555 | struct fib_config cfg; |
556 | struct fib_table *tb; | |
557 | int err; | |
1da177e4 | 558 | |
4e902c57 TG |
559 | err = rtm_to_fib_config(skb, nlh, &cfg); |
560 | if (err < 0) | |
561 | goto errout; | |
1da177e4 | 562 | |
4e902c57 TG |
563 | tb = fib_new_table(cfg.fc_table); |
564 | if (tb == NULL) { | |
565 | err = -ENOBUFS; | |
566 | goto errout; | |
567 | } | |
568 | ||
569 | err = tb->tb_insert(tb, &cfg); | |
570 | errout: | |
571 | return err; | |
1da177e4 LT |
572 | } |
573 | ||
63f3444f | 574 | static int inet_dump_fib(struct sk_buff *skb, struct netlink_callback *cb) |
1da177e4 | 575 | { |
1af5a8c4 PM |
576 | unsigned int h, s_h; |
577 | unsigned int e = 0, s_e; | |
1da177e4 | 578 | struct fib_table *tb; |
1af5a8c4 PM |
579 | struct hlist_node *node; |
580 | int dumped = 0; | |
1da177e4 | 581 | |
be403ea1 TG |
582 | if (nlmsg_len(cb->nlh) >= sizeof(struct rtmsg) && |
583 | ((struct rtmsg *) nlmsg_data(cb->nlh))->rtm_flags & RTM_F_CLONED) | |
1da177e4 LT |
584 | return ip_rt_dump(skb, cb); |
585 | ||
1af5a8c4 PM |
586 | s_h = cb->args[0]; |
587 | s_e = cb->args[1]; | |
588 | ||
589 | for (h = s_h; h < FIB_TABLE_HASHSZ; h++, s_e = 0) { | |
590 | e = 0; | |
591 | hlist_for_each_entry(tb, node, &fib_table_hash[h], tb_hlist) { | |
592 | if (e < s_e) | |
593 | goto next; | |
594 | if (dumped) | |
595 | memset(&cb->args[2], 0, sizeof(cb->args) - | |
e905a9ed | 596 | 2 * sizeof(cb->args[0])); |
1af5a8c4 PM |
597 | if (tb->tb_dump(tb, skb, cb) < 0) |
598 | goto out; | |
599 | dumped = 1; | |
600 | next: | |
601 | e++; | |
602 | } | |
1da177e4 | 603 | } |
1af5a8c4 PM |
604 | out: |
605 | cb->args[1] = e; | |
606 | cb->args[0] = h; | |
1da177e4 LT |
607 | |
608 | return skb->len; | |
609 | } | |
610 | ||
611 | /* Prepare and feed intra-kernel routing request. | |
612 | Really, it should be netlink message, but :-( netlink | |
613 | can be not configured, so that we feed it directly | |
614 | to fib engine. It is legal, because all events occur | |
615 | only when netlink is already locked. | |
616 | */ | |
617 | ||
81f7bf6c | 618 | static void fib_magic(int cmd, int type, __be32 dst, int dst_len, struct in_ifaddr *ifa) |
1da177e4 | 619 | { |
4e902c57 TG |
620 | struct fib_table *tb; |
621 | struct fib_config cfg = { | |
622 | .fc_protocol = RTPROT_KERNEL, | |
623 | .fc_type = type, | |
624 | .fc_dst = dst, | |
625 | .fc_dst_len = dst_len, | |
626 | .fc_prefsrc = ifa->ifa_local, | |
627 | .fc_oif = ifa->ifa_dev->dev->ifindex, | |
628 | .fc_nlflags = NLM_F_CREATE | NLM_F_APPEND, | |
629 | }; | |
1da177e4 LT |
630 | |
631 | if (type == RTN_UNICAST) | |
632 | tb = fib_new_table(RT_TABLE_MAIN); | |
633 | else | |
634 | tb = fib_new_table(RT_TABLE_LOCAL); | |
635 | ||
636 | if (tb == NULL) | |
637 | return; | |
638 | ||
4e902c57 | 639 | cfg.fc_table = tb->tb_id; |
1da177e4 | 640 | |
4e902c57 TG |
641 | if (type != RTN_LOCAL) |
642 | cfg.fc_scope = RT_SCOPE_LINK; | |
643 | else | |
644 | cfg.fc_scope = RT_SCOPE_HOST; | |
1da177e4 LT |
645 | |
646 | if (cmd == RTM_NEWROUTE) | |
4e902c57 | 647 | tb->tb_insert(tb, &cfg); |
1da177e4 | 648 | else |
4e902c57 | 649 | tb->tb_delete(tb, &cfg); |
1da177e4 LT |
650 | } |
651 | ||
0ff60a45 | 652 | void fib_add_ifaddr(struct in_ifaddr *ifa) |
1da177e4 LT |
653 | { |
654 | struct in_device *in_dev = ifa->ifa_dev; | |
655 | struct net_device *dev = in_dev->dev; | |
656 | struct in_ifaddr *prim = ifa; | |
a144ea4b AV |
657 | __be32 mask = ifa->ifa_mask; |
658 | __be32 addr = ifa->ifa_local; | |
659 | __be32 prefix = ifa->ifa_address&mask; | |
1da177e4 LT |
660 | |
661 | if (ifa->ifa_flags&IFA_F_SECONDARY) { | |
662 | prim = inet_ifa_byprefix(in_dev, prefix, mask); | |
663 | if (prim == NULL) { | |
664 | printk(KERN_DEBUG "fib_add_ifaddr: bug: prim == NULL\n"); | |
665 | return; | |
666 | } | |
667 | } | |
668 | ||
669 | fib_magic(RTM_NEWROUTE, RTN_LOCAL, addr, 32, prim); | |
670 | ||
671 | if (!(dev->flags&IFF_UP)) | |
672 | return; | |
673 | ||
674 | /* Add broadcast address, if it is explicitly assigned. */ | |
a144ea4b | 675 | if (ifa->ifa_broadcast && ifa->ifa_broadcast != htonl(0xFFFFFFFF)) |
1da177e4 LT |
676 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim); |
677 | ||
678 | if (!ZERONET(prefix) && !(ifa->ifa_flags&IFA_F_SECONDARY) && | |
679 | (prefix != addr || ifa->ifa_prefixlen < 32)) { | |
680 | fib_magic(RTM_NEWROUTE, dev->flags&IFF_LOOPBACK ? RTN_LOCAL : | |
681 | RTN_UNICAST, prefix, ifa->ifa_prefixlen, prim); | |
682 | ||
683 | /* Add network specific broadcasts, when it takes a sense */ | |
684 | if (ifa->ifa_prefixlen < 31) { | |
685 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix, 32, prim); | |
686 | fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix|~mask, 32, prim); | |
687 | } | |
688 | } | |
689 | } | |
690 | ||
691 | static void fib_del_ifaddr(struct in_ifaddr *ifa) | |
692 | { | |
693 | struct in_device *in_dev = ifa->ifa_dev; | |
694 | struct net_device *dev = in_dev->dev; | |
695 | struct in_ifaddr *ifa1; | |
696 | struct in_ifaddr *prim = ifa; | |
a144ea4b AV |
697 | __be32 brd = ifa->ifa_address|~ifa->ifa_mask; |
698 | __be32 any = ifa->ifa_address&ifa->ifa_mask; | |
1da177e4 LT |
699 | #define LOCAL_OK 1 |
700 | #define BRD_OK 2 | |
701 | #define BRD0_OK 4 | |
702 | #define BRD1_OK 8 | |
703 | unsigned ok = 0; | |
704 | ||
705 | if (!(ifa->ifa_flags&IFA_F_SECONDARY)) | |
706 | fib_magic(RTM_DELROUTE, dev->flags&IFF_LOOPBACK ? RTN_LOCAL : | |
707 | RTN_UNICAST, any, ifa->ifa_prefixlen, prim); | |
708 | else { | |
709 | prim = inet_ifa_byprefix(in_dev, any, ifa->ifa_mask); | |
710 | if (prim == NULL) { | |
711 | printk(KERN_DEBUG "fib_del_ifaddr: bug: prim == NULL\n"); | |
712 | return; | |
713 | } | |
714 | } | |
715 | ||
716 | /* Deletion is more complicated than add. | |
717 | We should take care of not to delete too much :-) | |
718 | ||
719 | Scan address list to be sure that addresses are really gone. | |
720 | */ | |
721 | ||
722 | for (ifa1 = in_dev->ifa_list; ifa1; ifa1 = ifa1->ifa_next) { | |
723 | if (ifa->ifa_local == ifa1->ifa_local) | |
724 | ok |= LOCAL_OK; | |
725 | if (ifa->ifa_broadcast == ifa1->ifa_broadcast) | |
726 | ok |= BRD_OK; | |
727 | if (brd == ifa1->ifa_broadcast) | |
728 | ok |= BRD1_OK; | |
729 | if (any == ifa1->ifa_broadcast) | |
730 | ok |= BRD0_OK; | |
731 | } | |
732 | ||
733 | if (!(ok&BRD_OK)) | |
734 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim); | |
735 | if (!(ok&BRD1_OK)) | |
736 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, brd, 32, prim); | |
737 | if (!(ok&BRD0_OK)) | |
738 | fib_magic(RTM_DELROUTE, RTN_BROADCAST, any, 32, prim); | |
739 | if (!(ok&LOCAL_OK)) { | |
740 | fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 32, prim); | |
741 | ||
742 | /* Check, that this local address finally disappeared. */ | |
743 | if (inet_addr_type(ifa->ifa_local) != RTN_LOCAL) { | |
744 | /* And the last, but not the least thing. | |
745 | We must flush stray FIB entries. | |
746 | ||
747 | First of all, we scan fib_info list searching | |
748 | for stray nexthop entries, then ignite fib_flush. | |
749 | */ | |
750 | if (fib_sync_down(ifa->ifa_local, NULL, 0)) | |
751 | fib_flush(); | |
752 | } | |
753 | } | |
754 | #undef LOCAL_OK | |
755 | #undef BRD_OK | |
756 | #undef BRD0_OK | |
757 | #undef BRD1_OK | |
758 | } | |
759 | ||
246955fe RO |
760 | static void nl_fib_lookup(struct fib_result_nl *frn, struct fib_table *tb ) |
761 | { | |
e905a9ed | 762 | |
246955fe | 763 | struct fib_result res; |
5f300893 | 764 | struct flowi fl = { .mark = frn->fl_mark, |
47dcf0cb | 765 | .nl_u = { .ip4_u = { .daddr = frn->fl_addr, |
246955fe RO |
766 | .tos = frn->fl_tos, |
767 | .scope = frn->fl_scope } } }; | |
1194ed0a | 768 | |
912a41a4 SV |
769 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
770 | res.r = NULL; | |
771 | #endif | |
772 | ||
1194ed0a | 773 | frn->err = -ENOENT; |
246955fe RO |
774 | if (tb) { |
775 | local_bh_disable(); | |
776 | ||
777 | frn->tb_id = tb->tb_id; | |
778 | frn->err = tb->tb_lookup(tb, &fl, &res); | |
779 | ||
780 | if (!frn->err) { | |
781 | frn->prefixlen = res.prefixlen; | |
782 | frn->nh_sel = res.nh_sel; | |
783 | frn->type = res.type; | |
784 | frn->scope = res.scope; | |
1194ed0a | 785 | fib_res_put(&res); |
246955fe RO |
786 | } |
787 | local_bh_enable(); | |
788 | } | |
789 | } | |
790 | ||
28f7b036 | 791 | static void nl_fib_input(struct sk_buff *skb) |
246955fe | 792 | { |
246955fe | 793 | struct fib_result_nl *frn; |
28f7b036 | 794 | struct nlmsghdr *nlh; |
246955fe | 795 | struct fib_table *tb; |
28f7b036 | 796 | u32 pid; |
1194ed0a | 797 | |
b529ccf2 | 798 | nlh = nlmsg_hdr(skb); |
ea86575e TG |
799 | if (skb->len < NLMSG_SPACE(0) || skb->len < nlh->nlmsg_len || |
800 | nlh->nlmsg_len < NLMSG_LENGTH(sizeof(*frn))) { | |
801 | kfree_skb(skb); | |
802 | return; | |
803 | } | |
e905a9ed | 804 | |
246955fe RO |
805 | frn = (struct fib_result_nl *) NLMSG_DATA(nlh); |
806 | tb = fib_get_table(frn->tb_id_in); | |
807 | ||
808 | nl_fib_lookup(frn, tb); | |
e905a9ed | 809 | |
1194ed0a | 810 | pid = NETLINK_CB(skb).pid; /* pid of sending process */ |
246955fe | 811 | NETLINK_CB(skb).pid = 0; /* from kernel */ |
ac6d439d | 812 | NETLINK_CB(skb).dst_group = 0; /* unicast */ |
cd40b7d3 | 813 | netlink_unicast(fibnl, skb, pid, MSG_DONTWAIT); |
e905a9ed | 814 | } |
246955fe RO |
815 | |
816 | static void nl_fib_lookup_init(void) | |
817 | { | |
cd40b7d3 DL |
818 | fibnl = netlink_kernel_create(&init_net, NETLINK_FIB_LOOKUP, 0, |
819 | nl_fib_input, NULL, THIS_MODULE); | |
246955fe RO |
820 | } |
821 | ||
1da177e4 LT |
822 | static void fib_disable_ip(struct net_device *dev, int force) |
823 | { | |
824 | if (fib_sync_down(0, dev, force)) | |
825 | fib_flush(); | |
826 | rt_cache_flush(0); | |
827 | arp_ifdown(dev); | |
828 | } | |
829 | ||
830 | static int fib_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr) | |
831 | { | |
832 | struct in_ifaddr *ifa = (struct in_ifaddr*)ptr; | |
833 | ||
834 | switch (event) { | |
835 | case NETDEV_UP: | |
836 | fib_add_ifaddr(ifa); | |
837 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
838 | fib_sync_up(ifa->ifa_dev->dev); | |
839 | #endif | |
840 | rt_cache_flush(-1); | |
841 | break; | |
842 | case NETDEV_DOWN: | |
843 | fib_del_ifaddr(ifa); | |
9fcc2e8a | 844 | if (ifa->ifa_dev->ifa_list == NULL) { |
1da177e4 LT |
845 | /* Last address was deleted from this interface. |
846 | Disable IP. | |
847 | */ | |
848 | fib_disable_ip(ifa->ifa_dev->dev, 1); | |
849 | } else { | |
850 | rt_cache_flush(-1); | |
851 | } | |
852 | break; | |
853 | } | |
854 | return NOTIFY_DONE; | |
855 | } | |
856 | ||
857 | static int fib_netdev_event(struct notifier_block *this, unsigned long event, void *ptr) | |
858 | { | |
859 | struct net_device *dev = ptr; | |
e5ed6399 | 860 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
1da177e4 | 861 | |
e9dc8653 EB |
862 | if (dev->nd_net != &init_net) |
863 | return NOTIFY_DONE; | |
864 | ||
1da177e4 LT |
865 | if (event == NETDEV_UNREGISTER) { |
866 | fib_disable_ip(dev, 2); | |
867 | return NOTIFY_DONE; | |
868 | } | |
869 | ||
870 | if (!in_dev) | |
871 | return NOTIFY_DONE; | |
872 | ||
873 | switch (event) { | |
874 | case NETDEV_UP: | |
875 | for_ifa(in_dev) { | |
876 | fib_add_ifaddr(ifa); | |
877 | } endfor_ifa(in_dev); | |
878 | #ifdef CONFIG_IP_ROUTE_MULTIPATH | |
879 | fib_sync_up(dev); | |
880 | #endif | |
881 | rt_cache_flush(-1); | |
882 | break; | |
883 | case NETDEV_DOWN: | |
884 | fib_disable_ip(dev, 0); | |
885 | break; | |
886 | case NETDEV_CHANGEMTU: | |
887 | case NETDEV_CHANGE: | |
888 | rt_cache_flush(0); | |
889 | break; | |
890 | } | |
891 | return NOTIFY_DONE; | |
892 | } | |
893 | ||
894 | static struct notifier_block fib_inetaddr_notifier = { | |
895 | .notifier_call =fib_inetaddr_event, | |
896 | }; | |
897 | ||
898 | static struct notifier_block fib_netdev_notifier = { | |
899 | .notifier_call =fib_netdev_event, | |
900 | }; | |
901 | ||
902 | void __init ip_fib_init(void) | |
903 | { | |
1af5a8c4 PM |
904 | unsigned int i; |
905 | ||
906 | for (i = 0; i < FIB_TABLE_HASHSZ; i++) | |
907 | INIT_HLIST_HEAD(&fib_table_hash[i]); | |
1da177e4 LT |
908 | #ifndef CONFIG_IP_MULTIPLE_TABLES |
909 | ip_fib_local_table = fib_hash_init(RT_TABLE_LOCAL); | |
1af5a8c4 | 910 | hlist_add_head_rcu(&ip_fib_local_table->tb_hlist, &fib_table_hash[0]); |
1da177e4 | 911 | ip_fib_main_table = fib_hash_init(RT_TABLE_MAIN); |
1af5a8c4 | 912 | hlist_add_head_rcu(&ip_fib_main_table->tb_hlist, &fib_table_hash[0]); |
1da177e4 | 913 | #else |
e1ef4bf2 | 914 | fib4_rules_init(); |
1da177e4 LT |
915 | #endif |
916 | ||
917 | register_netdevice_notifier(&fib_netdev_notifier); | |
918 | register_inetaddr_notifier(&fib_inetaddr_notifier); | |
246955fe | 919 | nl_fib_lookup_init(); |
63f3444f TG |
920 | |
921 | rtnl_register(PF_INET, RTM_NEWROUTE, inet_rtm_newroute, NULL); | |
922 | rtnl_register(PF_INET, RTM_DELROUTE, inet_rtm_delroute, NULL); | |
923 | rtnl_register(PF_INET, RTM_GETROUTE, NULL, inet_dump_fib); | |
1da177e4 LT |
924 | } |
925 | ||
926 | EXPORT_SYMBOL(inet_addr_type); | |
a1e8733e | 927 | EXPORT_SYMBOL(ip_dev_find); |