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 | * Routing netlink socket interface: protocol independent part. | |
7 | * | |
8 | * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or | |
11 | * modify it under the terms of the GNU General Public License | |
12 | * as published by the Free Software Foundation; either version | |
13 | * 2 of the License, or (at your option) any later version. | |
14 | * | |
15 | * Fixes: | |
16 | * Vitaly E. Lavrov RTA_OK arithmetics was wrong. | |
17 | */ | |
18 | ||
1da177e4 LT |
19 | #include <linux/errno.h> |
20 | #include <linux/module.h> | |
21 | #include <linux/types.h> | |
22 | #include <linux/socket.h> | |
23 | #include <linux/kernel.h> | |
1da177e4 LT |
24 | #include <linux/timer.h> |
25 | #include <linux/string.h> | |
26 | #include <linux/sockios.h> | |
27 | #include <linux/net.h> | |
28 | #include <linux/fcntl.h> | |
29 | #include <linux/mm.h> | |
30 | #include <linux/slab.h> | |
31 | #include <linux/interrupt.h> | |
32 | #include <linux/capability.h> | |
33 | #include <linux/skbuff.h> | |
34 | #include <linux/init.h> | |
35 | #include <linux/security.h> | |
6756ae4b | 36 | #include <linux/mutex.h> |
1823730f | 37 | #include <linux/if_addr.h> |
1da177e4 LT |
38 | |
39 | #include <asm/uaccess.h> | |
40 | #include <asm/system.h> | |
1da177e4 LT |
41 | |
42 | #include <linux/inet.h> | |
43 | #include <linux/netdevice.h> | |
44 | #include <net/ip.h> | |
45 | #include <net/protocol.h> | |
46 | #include <net/arp.h> | |
47 | #include <net/route.h> | |
48 | #include <net/udp.h> | |
49 | #include <net/sock.h> | |
50 | #include <net/pkt_sched.h> | |
14c0b97d | 51 | #include <net/fib_rules.h> |
e2849863 | 52 | #include <net/rtnetlink.h> |
30ffee84 | 53 | #include <net/net_namespace.h> |
1da177e4 | 54 | |
e0d087af | 55 | struct rtnl_link { |
e2849863 TG |
56 | rtnl_doit_func doit; |
57 | rtnl_dumpit_func dumpit; | |
58 | }; | |
59 | ||
6756ae4b | 60 | static DEFINE_MUTEX(rtnl_mutex); |
1da177e4 LT |
61 | |
62 | void rtnl_lock(void) | |
63 | { | |
6756ae4b | 64 | mutex_lock(&rtnl_mutex); |
1da177e4 | 65 | } |
e0d087af | 66 | EXPORT_SYMBOL(rtnl_lock); |
1da177e4 | 67 | |
6756ae4b | 68 | void __rtnl_unlock(void) |
1da177e4 | 69 | { |
6756ae4b | 70 | mutex_unlock(&rtnl_mutex); |
1da177e4 | 71 | } |
6756ae4b | 72 | |
1da177e4 LT |
73 | void rtnl_unlock(void) |
74 | { | |
58ec3b4d | 75 | /* This fellow will unlock it for us. */ |
1da177e4 LT |
76 | netdev_run_todo(); |
77 | } | |
e0d087af | 78 | EXPORT_SYMBOL(rtnl_unlock); |
1da177e4 | 79 | |
6756ae4b SH |
80 | int rtnl_trylock(void) |
81 | { | |
82 | return mutex_trylock(&rtnl_mutex); | |
83 | } | |
e0d087af | 84 | EXPORT_SYMBOL(rtnl_trylock); |
6756ae4b | 85 | |
c9c1014b PM |
86 | int rtnl_is_locked(void) |
87 | { | |
88 | return mutex_is_locked(&rtnl_mutex); | |
89 | } | |
e0d087af | 90 | EXPORT_SYMBOL(rtnl_is_locked); |
c9c1014b | 91 | |
42bad1da | 92 | static struct rtnl_link *rtnl_msg_handlers[NPROTO]; |
e2849863 TG |
93 | |
94 | static inline int rtm_msgindex(int msgtype) | |
95 | { | |
96 | int msgindex = msgtype - RTM_BASE; | |
97 | ||
98 | /* | |
99 | * msgindex < 0 implies someone tried to register a netlink | |
100 | * control code. msgindex >= RTM_NR_MSGTYPES may indicate that | |
101 | * the message type has not been added to linux/rtnetlink.h | |
102 | */ | |
103 | BUG_ON(msgindex < 0 || msgindex >= RTM_NR_MSGTYPES); | |
104 | ||
105 | return msgindex; | |
106 | } | |
107 | ||
108 | static rtnl_doit_func rtnl_get_doit(int protocol, int msgindex) | |
109 | { | |
110 | struct rtnl_link *tab; | |
111 | ||
112 | tab = rtnl_msg_handlers[protocol]; | |
51057f2f | 113 | if (tab == NULL || tab[msgindex].doit == NULL) |
e2849863 TG |
114 | tab = rtnl_msg_handlers[PF_UNSPEC]; |
115 | ||
51057f2f | 116 | return tab ? tab[msgindex].doit : NULL; |
e2849863 TG |
117 | } |
118 | ||
119 | static rtnl_dumpit_func rtnl_get_dumpit(int protocol, int msgindex) | |
120 | { | |
121 | struct rtnl_link *tab; | |
122 | ||
123 | tab = rtnl_msg_handlers[protocol]; | |
51057f2f | 124 | if (tab == NULL || tab[msgindex].dumpit == NULL) |
e2849863 TG |
125 | tab = rtnl_msg_handlers[PF_UNSPEC]; |
126 | ||
51057f2f | 127 | return tab ? tab[msgindex].dumpit : NULL; |
e2849863 TG |
128 | } |
129 | ||
130 | /** | |
131 | * __rtnl_register - Register a rtnetlink message type | |
132 | * @protocol: Protocol family or PF_UNSPEC | |
133 | * @msgtype: rtnetlink message type | |
134 | * @doit: Function pointer called for each request message | |
135 | * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message | |
136 | * | |
137 | * Registers the specified function pointers (at least one of them has | |
138 | * to be non-NULL) to be called whenever a request message for the | |
139 | * specified protocol family and message type is received. | |
140 | * | |
141 | * The special protocol family PF_UNSPEC may be used to define fallback | |
142 | * function pointers for the case when no entry for the specific protocol | |
143 | * family exists. | |
144 | * | |
145 | * Returns 0 on success or a negative error code. | |
146 | */ | |
147 | int __rtnl_register(int protocol, int msgtype, | |
148 | rtnl_doit_func doit, rtnl_dumpit_func dumpit) | |
149 | { | |
150 | struct rtnl_link *tab; | |
151 | int msgindex; | |
152 | ||
153 | BUG_ON(protocol < 0 || protocol >= NPROTO); | |
154 | msgindex = rtm_msgindex(msgtype); | |
155 | ||
156 | tab = rtnl_msg_handlers[protocol]; | |
157 | if (tab == NULL) { | |
158 | tab = kcalloc(RTM_NR_MSGTYPES, sizeof(*tab), GFP_KERNEL); | |
159 | if (tab == NULL) | |
160 | return -ENOBUFS; | |
161 | ||
162 | rtnl_msg_handlers[protocol] = tab; | |
163 | } | |
164 | ||
165 | if (doit) | |
166 | tab[msgindex].doit = doit; | |
167 | ||
168 | if (dumpit) | |
169 | tab[msgindex].dumpit = dumpit; | |
170 | ||
171 | return 0; | |
172 | } | |
e2849863 TG |
173 | EXPORT_SYMBOL_GPL(__rtnl_register); |
174 | ||
175 | /** | |
176 | * rtnl_register - Register a rtnetlink message type | |
177 | * | |
178 | * Identical to __rtnl_register() but panics on failure. This is useful | |
179 | * as failure of this function is very unlikely, it can only happen due | |
180 | * to lack of memory when allocating the chain to store all message | |
181 | * handlers for a protocol. Meant for use in init functions where lack | |
182 | * of memory implies no sense in continueing. | |
183 | */ | |
184 | void rtnl_register(int protocol, int msgtype, | |
185 | rtnl_doit_func doit, rtnl_dumpit_func dumpit) | |
186 | { | |
187 | if (__rtnl_register(protocol, msgtype, doit, dumpit) < 0) | |
188 | panic("Unable to register rtnetlink message handler, " | |
189 | "protocol = %d, message type = %d\n", | |
190 | protocol, msgtype); | |
191 | } | |
e2849863 TG |
192 | EXPORT_SYMBOL_GPL(rtnl_register); |
193 | ||
194 | /** | |
195 | * rtnl_unregister - Unregister a rtnetlink message type | |
196 | * @protocol: Protocol family or PF_UNSPEC | |
197 | * @msgtype: rtnetlink message type | |
198 | * | |
199 | * Returns 0 on success or a negative error code. | |
200 | */ | |
201 | int rtnl_unregister(int protocol, int msgtype) | |
202 | { | |
203 | int msgindex; | |
204 | ||
205 | BUG_ON(protocol < 0 || protocol >= NPROTO); | |
206 | msgindex = rtm_msgindex(msgtype); | |
207 | ||
208 | if (rtnl_msg_handlers[protocol] == NULL) | |
209 | return -ENOENT; | |
210 | ||
211 | rtnl_msg_handlers[protocol][msgindex].doit = NULL; | |
212 | rtnl_msg_handlers[protocol][msgindex].dumpit = NULL; | |
213 | ||
214 | return 0; | |
215 | } | |
e2849863 TG |
216 | EXPORT_SYMBOL_GPL(rtnl_unregister); |
217 | ||
218 | /** | |
219 | * rtnl_unregister_all - Unregister all rtnetlink message type of a protocol | |
220 | * @protocol : Protocol family or PF_UNSPEC | |
221 | * | |
222 | * Identical to calling rtnl_unregster() for all registered message types | |
223 | * of a certain protocol family. | |
224 | */ | |
225 | void rtnl_unregister_all(int protocol) | |
226 | { | |
227 | BUG_ON(protocol < 0 || protocol >= NPROTO); | |
228 | ||
229 | kfree(rtnl_msg_handlers[protocol]); | |
230 | rtnl_msg_handlers[protocol] = NULL; | |
231 | } | |
e2849863 | 232 | EXPORT_SYMBOL_GPL(rtnl_unregister_all); |
1da177e4 | 233 | |
38f7b870 PM |
234 | static LIST_HEAD(link_ops); |
235 | ||
236 | /** | |
237 | * __rtnl_link_register - Register rtnl_link_ops with rtnetlink. | |
238 | * @ops: struct rtnl_link_ops * to register | |
239 | * | |
240 | * The caller must hold the rtnl_mutex. This function should be used | |
241 | * by drivers that create devices during module initialization. It | |
242 | * must be called before registering the devices. | |
243 | * | |
244 | * Returns 0 on success or a negative error code. | |
245 | */ | |
246 | int __rtnl_link_register(struct rtnl_link_ops *ops) | |
247 | { | |
2d85cba2 | 248 | if (!ops->dellink) |
23289a37 | 249 | ops->dellink = unregister_netdevice_queue; |
2d85cba2 | 250 | |
38f7b870 PM |
251 | list_add_tail(&ops->list, &link_ops); |
252 | return 0; | |
253 | } | |
38f7b870 PM |
254 | EXPORT_SYMBOL_GPL(__rtnl_link_register); |
255 | ||
256 | /** | |
257 | * rtnl_link_register - Register rtnl_link_ops with rtnetlink. | |
258 | * @ops: struct rtnl_link_ops * to register | |
259 | * | |
260 | * Returns 0 on success or a negative error code. | |
261 | */ | |
262 | int rtnl_link_register(struct rtnl_link_ops *ops) | |
263 | { | |
264 | int err; | |
265 | ||
266 | rtnl_lock(); | |
267 | err = __rtnl_link_register(ops); | |
268 | rtnl_unlock(); | |
269 | return err; | |
270 | } | |
38f7b870 PM |
271 | EXPORT_SYMBOL_GPL(rtnl_link_register); |
272 | ||
669f87ba PE |
273 | static void __rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops) |
274 | { | |
275 | struct net_device *dev; | |
23289a37 ED |
276 | LIST_HEAD(list_kill); |
277 | ||
669f87ba | 278 | for_each_netdev(net, dev) { |
23289a37 ED |
279 | if (dev->rtnl_link_ops == ops) |
280 | ops->dellink(dev, &list_kill); | |
669f87ba | 281 | } |
23289a37 | 282 | unregister_netdevice_many(&list_kill); |
669f87ba PE |
283 | } |
284 | ||
285 | void rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops) | |
286 | { | |
287 | rtnl_lock(); | |
288 | __rtnl_kill_links(net, ops); | |
289 | rtnl_unlock(); | |
290 | } | |
291 | EXPORT_SYMBOL_GPL(rtnl_kill_links); | |
292 | ||
38f7b870 PM |
293 | /** |
294 | * __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink. | |
295 | * @ops: struct rtnl_link_ops * to unregister | |
296 | * | |
2d85cba2 | 297 | * The caller must hold the rtnl_mutex. |
38f7b870 PM |
298 | */ |
299 | void __rtnl_link_unregister(struct rtnl_link_ops *ops) | |
300 | { | |
881d966b | 301 | struct net *net; |
2d85cba2 | 302 | |
881d966b | 303 | for_each_net(net) { |
669f87ba | 304 | __rtnl_kill_links(net, ops); |
2d85cba2 | 305 | } |
38f7b870 PM |
306 | list_del(&ops->list); |
307 | } | |
38f7b870 PM |
308 | EXPORT_SYMBOL_GPL(__rtnl_link_unregister); |
309 | ||
310 | /** | |
311 | * rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink. | |
312 | * @ops: struct rtnl_link_ops * to unregister | |
313 | */ | |
314 | void rtnl_link_unregister(struct rtnl_link_ops *ops) | |
315 | { | |
316 | rtnl_lock(); | |
317 | __rtnl_link_unregister(ops); | |
318 | rtnl_unlock(); | |
319 | } | |
38f7b870 PM |
320 | EXPORT_SYMBOL_GPL(rtnl_link_unregister); |
321 | ||
322 | static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind) | |
323 | { | |
324 | const struct rtnl_link_ops *ops; | |
325 | ||
326 | list_for_each_entry(ops, &link_ops, list) { | |
327 | if (!strcmp(ops->kind, kind)) | |
328 | return ops; | |
329 | } | |
330 | return NULL; | |
331 | } | |
332 | ||
333 | static size_t rtnl_link_get_size(const struct net_device *dev) | |
334 | { | |
335 | const struct rtnl_link_ops *ops = dev->rtnl_link_ops; | |
336 | size_t size; | |
337 | ||
338 | if (!ops) | |
339 | return 0; | |
340 | ||
341 | size = nlmsg_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */ | |
342 | nlmsg_total_size(strlen(ops->kind) + 1); /* IFLA_INFO_KIND */ | |
343 | ||
344 | if (ops->get_size) | |
345 | /* IFLA_INFO_DATA + nested data */ | |
346 | size += nlmsg_total_size(sizeof(struct nlattr)) + | |
347 | ops->get_size(dev); | |
348 | ||
349 | if (ops->get_xstats_size) | |
350 | size += ops->get_xstats_size(dev); /* IFLA_INFO_XSTATS */ | |
351 | ||
352 | return size; | |
353 | } | |
354 | ||
355 | static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev) | |
356 | { | |
357 | const struct rtnl_link_ops *ops = dev->rtnl_link_ops; | |
358 | struct nlattr *linkinfo, *data; | |
359 | int err = -EMSGSIZE; | |
360 | ||
361 | linkinfo = nla_nest_start(skb, IFLA_LINKINFO); | |
362 | if (linkinfo == NULL) | |
363 | goto out; | |
364 | ||
365 | if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0) | |
366 | goto err_cancel_link; | |
367 | if (ops->fill_xstats) { | |
368 | err = ops->fill_xstats(skb, dev); | |
369 | if (err < 0) | |
370 | goto err_cancel_link; | |
371 | } | |
372 | if (ops->fill_info) { | |
373 | data = nla_nest_start(skb, IFLA_INFO_DATA); | |
374 | if (data == NULL) | |
375 | goto err_cancel_link; | |
376 | err = ops->fill_info(skb, dev); | |
377 | if (err < 0) | |
378 | goto err_cancel_data; | |
379 | nla_nest_end(skb, data); | |
380 | } | |
381 | ||
382 | nla_nest_end(skb, linkinfo); | |
383 | return 0; | |
384 | ||
385 | err_cancel_data: | |
386 | nla_nest_cancel(skb, data); | |
387 | err_cancel_link: | |
388 | nla_nest_cancel(skb, linkinfo); | |
389 | out: | |
390 | return err; | |
391 | } | |
392 | ||
db46edc6 | 393 | static const int rtm_min[RTM_NR_FAMILIES] = |
1da177e4 | 394 | { |
f90a0a74 TG |
395 | [RTM_FAM(RTM_NEWLINK)] = NLMSG_LENGTH(sizeof(struct ifinfomsg)), |
396 | [RTM_FAM(RTM_NEWADDR)] = NLMSG_LENGTH(sizeof(struct ifaddrmsg)), | |
397 | [RTM_FAM(RTM_NEWROUTE)] = NLMSG_LENGTH(sizeof(struct rtmsg)), | |
14c0b97d | 398 | [RTM_FAM(RTM_NEWRULE)] = NLMSG_LENGTH(sizeof(struct fib_rule_hdr)), |
f90a0a74 TG |
399 | [RTM_FAM(RTM_NEWQDISC)] = NLMSG_LENGTH(sizeof(struct tcmsg)), |
400 | [RTM_FAM(RTM_NEWTCLASS)] = NLMSG_LENGTH(sizeof(struct tcmsg)), | |
401 | [RTM_FAM(RTM_NEWTFILTER)] = NLMSG_LENGTH(sizeof(struct tcmsg)), | |
402 | [RTM_FAM(RTM_NEWACTION)] = NLMSG_LENGTH(sizeof(struct tcamsg)), | |
f90a0a74 TG |
403 | [RTM_FAM(RTM_GETMULTICAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)), |
404 | [RTM_FAM(RTM_GETANYCAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)), | |
1da177e4 LT |
405 | }; |
406 | ||
db46edc6 | 407 | static const int rta_max[RTM_NR_FAMILIES] = |
1da177e4 | 408 | { |
f90a0a74 TG |
409 | [RTM_FAM(RTM_NEWLINK)] = IFLA_MAX, |
410 | [RTM_FAM(RTM_NEWADDR)] = IFA_MAX, | |
411 | [RTM_FAM(RTM_NEWROUTE)] = RTA_MAX, | |
14c0b97d | 412 | [RTM_FAM(RTM_NEWRULE)] = FRA_MAX, |
f90a0a74 TG |
413 | [RTM_FAM(RTM_NEWQDISC)] = TCA_MAX, |
414 | [RTM_FAM(RTM_NEWTCLASS)] = TCA_MAX, | |
415 | [RTM_FAM(RTM_NEWTFILTER)] = TCA_MAX, | |
416 | [RTM_FAM(RTM_NEWACTION)] = TCAA_MAX, | |
1da177e4 LT |
417 | }; |
418 | ||
419 | void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const void *data) | |
420 | { | |
421 | struct rtattr *rta; | |
422 | int size = RTA_LENGTH(attrlen); | |
423 | ||
e0d087af | 424 | rta = (struct rtattr *)skb_put(skb, RTA_ALIGN(size)); |
1da177e4 LT |
425 | rta->rta_type = attrtype; |
426 | rta->rta_len = size; | |
427 | memcpy(RTA_DATA(rta), data, attrlen); | |
b3563c4f | 428 | memset(RTA_DATA(rta) + attrlen, 0, RTA_ALIGN(size) - size); |
1da177e4 | 429 | } |
e0d087af | 430 | EXPORT_SYMBOL(__rta_fill); |
1da177e4 | 431 | |
97c53cac | 432 | int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned group, int echo) |
1da177e4 | 433 | { |
97c53cac | 434 | struct sock *rtnl = net->rtnl; |
1da177e4 LT |
435 | int err = 0; |
436 | ||
ac6d439d | 437 | NETLINK_CB(skb).dst_group = group; |
1da177e4 LT |
438 | if (echo) |
439 | atomic_inc(&skb->users); | |
440 | netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL); | |
441 | if (echo) | |
442 | err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT); | |
443 | return err; | |
444 | } | |
445 | ||
97c53cac | 446 | int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid) |
2942e900 | 447 | { |
97c53cac DL |
448 | struct sock *rtnl = net->rtnl; |
449 | ||
2942e900 TG |
450 | return nlmsg_unicast(rtnl, skb, pid); |
451 | } | |
e0d087af | 452 | EXPORT_SYMBOL(rtnl_unicast); |
2942e900 | 453 | |
1ce85fe4 PNA |
454 | void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group, |
455 | struct nlmsghdr *nlh, gfp_t flags) | |
97676b6b | 456 | { |
97c53cac | 457 | struct sock *rtnl = net->rtnl; |
97676b6b TG |
458 | int report = 0; |
459 | ||
460 | if (nlh) | |
461 | report = nlmsg_report(nlh); | |
462 | ||
1ce85fe4 | 463 | nlmsg_notify(rtnl, skb, pid, group, report, flags); |
97676b6b | 464 | } |
e0d087af | 465 | EXPORT_SYMBOL(rtnl_notify); |
97676b6b | 466 | |
97c53cac | 467 | void rtnl_set_sk_err(struct net *net, u32 group, int error) |
97676b6b | 468 | { |
97c53cac DL |
469 | struct sock *rtnl = net->rtnl; |
470 | ||
97676b6b TG |
471 | netlink_set_err(rtnl, 0, group, error); |
472 | } | |
e0d087af | 473 | EXPORT_SYMBOL(rtnl_set_sk_err); |
97676b6b | 474 | |
1da177e4 LT |
475 | int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics) |
476 | { | |
2d7202bf TG |
477 | struct nlattr *mx; |
478 | int i, valid = 0; | |
479 | ||
480 | mx = nla_nest_start(skb, RTA_METRICS); | |
481 | if (mx == NULL) | |
482 | return -ENOBUFS; | |
483 | ||
484 | for (i = 0; i < RTAX_MAX; i++) { | |
485 | if (metrics[i]) { | |
486 | valid++; | |
487 | NLA_PUT_U32(skb, i+1, metrics[i]); | |
488 | } | |
1da177e4 | 489 | } |
1da177e4 | 490 | |
a57d27fc DM |
491 | if (!valid) { |
492 | nla_nest_cancel(skb, mx); | |
493 | return 0; | |
494 | } | |
2d7202bf TG |
495 | |
496 | return nla_nest_end(skb, mx); | |
497 | ||
498 | nla_put_failure: | |
bc3ed28c TG |
499 | nla_nest_cancel(skb, mx); |
500 | return -EMSGSIZE; | |
1da177e4 | 501 | } |
e0d087af | 502 | EXPORT_SYMBOL(rtnetlink_put_metrics); |
1da177e4 | 503 | |
e3703b3d TG |
504 | int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id, |
505 | u32 ts, u32 tsage, long expires, u32 error) | |
506 | { | |
507 | struct rta_cacheinfo ci = { | |
508 | .rta_lastuse = jiffies_to_clock_t(jiffies - dst->lastuse), | |
509 | .rta_used = dst->__use, | |
510 | .rta_clntref = atomic_read(&(dst->__refcnt)), | |
511 | .rta_error = error, | |
512 | .rta_id = id, | |
513 | .rta_ts = ts, | |
514 | .rta_tsage = tsage, | |
515 | }; | |
516 | ||
517 | if (expires) | |
518 | ci.rta_expires = jiffies_to_clock_t(expires); | |
519 | ||
520 | return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci); | |
521 | } | |
e3703b3d | 522 | EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo); |
1da177e4 | 523 | |
93b2d4a2 | 524 | static void set_operstate(struct net_device *dev, unsigned char transition) |
b00055aa SR |
525 | { |
526 | unsigned char operstate = dev->operstate; | |
527 | ||
e0d087af | 528 | switch (transition) { |
b00055aa SR |
529 | case IF_OPER_UP: |
530 | if ((operstate == IF_OPER_DORMANT || | |
531 | operstate == IF_OPER_UNKNOWN) && | |
532 | !netif_dormant(dev)) | |
533 | operstate = IF_OPER_UP; | |
534 | break; | |
535 | ||
536 | case IF_OPER_DORMANT: | |
537 | if (operstate == IF_OPER_UP || | |
538 | operstate == IF_OPER_UNKNOWN) | |
539 | operstate = IF_OPER_DORMANT; | |
540 | break; | |
3ff50b79 | 541 | } |
b00055aa SR |
542 | |
543 | if (dev->operstate != operstate) { | |
544 | write_lock_bh(&dev_base_lock); | |
545 | dev->operstate = operstate; | |
546 | write_unlock_bh(&dev_base_lock); | |
93b2d4a2 DM |
547 | netdev_state_change(dev); |
548 | } | |
b00055aa SR |
549 | } |
550 | ||
b60c5115 | 551 | static void copy_rtnl_link_stats(struct rtnl_link_stats *a, |
eeda3fd6 | 552 | const struct net_device_stats *b) |
1da177e4 | 553 | { |
b60c5115 TG |
554 | a->rx_packets = b->rx_packets; |
555 | a->tx_packets = b->tx_packets; | |
556 | a->rx_bytes = b->rx_bytes; | |
557 | a->tx_bytes = b->tx_bytes; | |
558 | a->rx_errors = b->rx_errors; | |
559 | a->tx_errors = b->tx_errors; | |
560 | a->rx_dropped = b->rx_dropped; | |
561 | a->tx_dropped = b->tx_dropped; | |
562 | ||
563 | a->multicast = b->multicast; | |
564 | a->collisions = b->collisions; | |
565 | ||
566 | a->rx_length_errors = b->rx_length_errors; | |
567 | a->rx_over_errors = b->rx_over_errors; | |
568 | a->rx_crc_errors = b->rx_crc_errors; | |
569 | a->rx_frame_errors = b->rx_frame_errors; | |
570 | a->rx_fifo_errors = b->rx_fifo_errors; | |
571 | a->rx_missed_errors = b->rx_missed_errors; | |
572 | ||
573 | a->tx_aborted_errors = b->tx_aborted_errors; | |
574 | a->tx_carrier_errors = b->tx_carrier_errors; | |
575 | a->tx_fifo_errors = b->tx_fifo_errors; | |
576 | a->tx_heartbeat_errors = b->tx_heartbeat_errors; | |
577 | a->tx_window_errors = b->tx_window_errors; | |
578 | ||
579 | a->rx_compressed = b->rx_compressed; | |
580 | a->tx_compressed = b->tx_compressed; | |
581 | }; | |
1da177e4 | 582 | |
38f7b870 | 583 | static inline size_t if_nlmsg_size(const struct net_device *dev) |
339bf98f TG |
584 | { |
585 | return NLMSG_ALIGN(sizeof(struct ifinfomsg)) | |
586 | + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ | |
0b815a1a | 587 | + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */ |
339bf98f TG |
588 | + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */ |
589 | + nla_total_size(sizeof(struct rtnl_link_ifmap)) | |
590 | + nla_total_size(sizeof(struct rtnl_link_stats)) | |
591 | + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ | |
592 | + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */ | |
593 | + nla_total_size(4) /* IFLA_TXQLEN */ | |
594 | + nla_total_size(4) /* IFLA_WEIGHT */ | |
595 | + nla_total_size(4) /* IFLA_MTU */ | |
596 | + nla_total_size(4) /* IFLA_LINK */ | |
597 | + nla_total_size(4) /* IFLA_MASTER */ | |
598 | + nla_total_size(1) /* IFLA_OPERSTATE */ | |
38f7b870 PM |
599 | + nla_total_size(1) /* IFLA_LINKMODE */ |
600 | + rtnl_link_get_size(dev); /* IFLA_LINKINFO */ | |
339bf98f TG |
601 | } |
602 | ||
b60c5115 | 603 | static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev, |
575c3e2a PM |
604 | int type, u32 pid, u32 seq, u32 change, |
605 | unsigned int flags) | |
b60c5115 TG |
606 | { |
607 | struct ifinfomsg *ifm; | |
608 | struct nlmsghdr *nlh; | |
eeda3fd6 | 609 | const struct net_device_stats *stats; |
96e74088 | 610 | struct nlattr *attr; |
1da177e4 | 611 | |
b60c5115 TG |
612 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags); |
613 | if (nlh == NULL) | |
26932566 | 614 | return -EMSGSIZE; |
1da177e4 | 615 | |
b60c5115 TG |
616 | ifm = nlmsg_data(nlh); |
617 | ifm->ifi_family = AF_UNSPEC; | |
618 | ifm->__ifi_pad = 0; | |
619 | ifm->ifi_type = dev->type; | |
620 | ifm->ifi_index = dev->ifindex; | |
621 | ifm->ifi_flags = dev_get_flags(dev); | |
622 | ifm->ifi_change = change; | |
623 | ||
624 | NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name); | |
625 | NLA_PUT_U32(skb, IFLA_TXQLEN, dev->tx_queue_len); | |
b60c5115 TG |
626 | NLA_PUT_U8(skb, IFLA_OPERSTATE, |
627 | netif_running(dev) ? dev->operstate : IF_OPER_DOWN); | |
628 | NLA_PUT_U8(skb, IFLA_LINKMODE, dev->link_mode); | |
629 | NLA_PUT_U32(skb, IFLA_MTU, dev->mtu); | |
630 | ||
631 | if (dev->ifindex != dev->iflink) | |
632 | NLA_PUT_U32(skb, IFLA_LINK, dev->iflink); | |
633 | ||
634 | if (dev->master) | |
635 | NLA_PUT_U32(skb, IFLA_MASTER, dev->master->ifindex); | |
1da177e4 | 636 | |
af356afa PM |
637 | if (dev->qdisc) |
638 | NLA_PUT_STRING(skb, IFLA_QDISC, dev->qdisc->ops->id); | |
b00055aa | 639 | |
0b815a1a SH |
640 | if (dev->ifalias) |
641 | NLA_PUT_STRING(skb, IFLA_IFALIAS, dev->ifalias); | |
642 | ||
1da177e4 LT |
643 | if (1) { |
644 | struct rtnl_link_ifmap map = { | |
645 | .mem_start = dev->mem_start, | |
646 | .mem_end = dev->mem_end, | |
647 | .base_addr = dev->base_addr, | |
648 | .irq = dev->irq, | |
649 | .dma = dev->dma, | |
650 | .port = dev->if_port, | |
651 | }; | |
b60c5115 | 652 | NLA_PUT(skb, IFLA_MAP, sizeof(map), &map); |
1da177e4 LT |
653 | } |
654 | ||
655 | if (dev->addr_len) { | |
b60c5115 TG |
656 | NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr); |
657 | NLA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast); | |
1da177e4 LT |
658 | } |
659 | ||
96e74088 PE |
660 | attr = nla_reserve(skb, IFLA_STATS, |
661 | sizeof(struct rtnl_link_stats)); | |
662 | if (attr == NULL) | |
663 | goto nla_put_failure; | |
b60c5115 | 664 | |
eeda3fd6 | 665 | stats = dev_get_stats(dev); |
96e74088 | 666 | copy_rtnl_link_stats(nla_data(attr), stats); |
1da177e4 | 667 | |
38f7b870 PM |
668 | if (dev->rtnl_link_ops) { |
669 | if (rtnl_link_fill(skb, dev) < 0) | |
670 | goto nla_put_failure; | |
671 | } | |
672 | ||
b60c5115 TG |
673 | return nlmsg_end(skb, nlh); |
674 | ||
675 | nla_put_failure: | |
26932566 PM |
676 | nlmsg_cancel(skb, nlh); |
677 | return -EMSGSIZE; | |
1da177e4 LT |
678 | } |
679 | ||
b60c5115 | 680 | static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) |
1da177e4 | 681 | { |
3b1e0a65 | 682 | struct net *net = sock_net(skb->sk); |
7c28bd0b ED |
683 | int h, s_h; |
684 | int idx = 0, s_idx; | |
1da177e4 | 685 | struct net_device *dev; |
7c28bd0b ED |
686 | struct hlist_head *head; |
687 | struct hlist_node *node; | |
688 | ||
689 | s_h = cb->args[0]; | |
690 | s_idx = cb->args[1]; | |
691 | ||
692 | for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { | |
693 | idx = 0; | |
694 | head = &net->dev_index_head[h]; | |
695 | hlist_for_each_entry(dev, node, head, index_hlist) { | |
696 | if (idx < s_idx) | |
697 | goto cont; | |
698 | if (rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK, | |
699 | NETLINK_CB(cb->skb).pid, | |
700 | cb->nlh->nlmsg_seq, 0, | |
701 | NLM_F_MULTI) <= 0) | |
702 | goto out; | |
7562f876 | 703 | cont: |
7c28bd0b ED |
704 | idx++; |
705 | } | |
1da177e4 | 706 | } |
7c28bd0b ED |
707 | out: |
708 | cb->args[1] = idx; | |
709 | cb->args[0] = h; | |
1da177e4 LT |
710 | |
711 | return skb->len; | |
712 | } | |
713 | ||
e7199288 | 714 | const struct nla_policy ifla_policy[IFLA_MAX+1] = { |
5176f91e | 715 | [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 }, |
38f7b870 PM |
716 | [IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, |
717 | [IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, | |
5176f91e | 718 | [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) }, |
da5e0494 | 719 | [IFLA_MTU] = { .type = NLA_U32 }, |
76e87306 | 720 | [IFLA_LINK] = { .type = NLA_U32 }, |
da5e0494 TG |
721 | [IFLA_TXQLEN] = { .type = NLA_U32 }, |
722 | [IFLA_WEIGHT] = { .type = NLA_U32 }, | |
723 | [IFLA_OPERSTATE] = { .type = NLA_U8 }, | |
724 | [IFLA_LINKMODE] = { .type = NLA_U8 }, | |
76e87306 | 725 | [IFLA_LINKINFO] = { .type = NLA_NESTED }, |
d8a5ec67 | 726 | [IFLA_NET_NS_PID] = { .type = NLA_U32 }, |
0b815a1a | 727 | [IFLA_IFALIAS] = { .type = NLA_STRING, .len = IFALIASZ-1 }, |
da5e0494 | 728 | }; |
e0d087af | 729 | EXPORT_SYMBOL(ifla_policy); |
da5e0494 | 730 | |
38f7b870 PM |
731 | static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = { |
732 | [IFLA_INFO_KIND] = { .type = NLA_STRING }, | |
733 | [IFLA_INFO_DATA] = { .type = NLA_NESTED }, | |
734 | }; | |
735 | ||
81adee47 EB |
736 | struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[]) |
737 | { | |
738 | struct net *net; | |
739 | /* Examine the link attributes and figure out which | |
740 | * network namespace we are talking about. | |
741 | */ | |
742 | if (tb[IFLA_NET_NS_PID]) | |
743 | net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID])); | |
744 | else | |
745 | net = get_net(src_net); | |
746 | return net; | |
747 | } | |
748 | EXPORT_SYMBOL(rtnl_link_get_net); | |
749 | ||
1840bb13 TG |
750 | static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[]) |
751 | { | |
752 | if (dev) { | |
753 | if (tb[IFLA_ADDRESS] && | |
754 | nla_len(tb[IFLA_ADDRESS]) < dev->addr_len) | |
755 | return -EINVAL; | |
756 | ||
757 | if (tb[IFLA_BROADCAST] && | |
758 | nla_len(tb[IFLA_BROADCAST]) < dev->addr_len) | |
759 | return -EINVAL; | |
760 | } | |
761 | ||
762 | return 0; | |
763 | } | |
764 | ||
0157f60c | 765 | static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm, |
38f7b870 | 766 | struct nlattr **tb, char *ifname, int modified) |
1da177e4 | 767 | { |
d314774c | 768 | const struct net_device_ops *ops = dev->netdev_ops; |
38f7b870 | 769 | int send_addr_notify = 0; |
0157f60c | 770 | int err; |
1da177e4 | 771 | |
d8a5ec67 | 772 | if (tb[IFLA_NET_NS_PID]) { |
81adee47 | 773 | struct net *net = rtnl_link_get_net(dev_net(dev), tb); |
d8a5ec67 EB |
774 | if (IS_ERR(net)) { |
775 | err = PTR_ERR(net); | |
776 | goto errout; | |
777 | } | |
778 | err = dev_change_net_namespace(dev, net, ifname); | |
779 | put_net(net); | |
780 | if (err) | |
781 | goto errout; | |
782 | modified = 1; | |
783 | } | |
784 | ||
da5e0494 | 785 | if (tb[IFLA_MAP]) { |
1da177e4 LT |
786 | struct rtnl_link_ifmap *u_map; |
787 | struct ifmap k_map; | |
788 | ||
d314774c | 789 | if (!ops->ndo_set_config) { |
1da177e4 | 790 | err = -EOPNOTSUPP; |
0157f60c | 791 | goto errout; |
1da177e4 LT |
792 | } |
793 | ||
794 | if (!netif_device_present(dev)) { | |
795 | err = -ENODEV; | |
0157f60c | 796 | goto errout; |
1da177e4 | 797 | } |
1da177e4 | 798 | |
da5e0494 | 799 | u_map = nla_data(tb[IFLA_MAP]); |
1da177e4 LT |
800 | k_map.mem_start = (unsigned long) u_map->mem_start; |
801 | k_map.mem_end = (unsigned long) u_map->mem_end; | |
802 | k_map.base_addr = (unsigned short) u_map->base_addr; | |
803 | k_map.irq = (unsigned char) u_map->irq; | |
804 | k_map.dma = (unsigned char) u_map->dma; | |
805 | k_map.port = (unsigned char) u_map->port; | |
806 | ||
d314774c | 807 | err = ops->ndo_set_config(dev, &k_map); |
da5e0494 | 808 | if (err < 0) |
0157f60c | 809 | goto errout; |
1da177e4 | 810 | |
da5e0494 | 811 | modified = 1; |
1da177e4 LT |
812 | } |
813 | ||
da5e0494 | 814 | if (tb[IFLA_ADDRESS]) { |
70f8e78e DM |
815 | struct sockaddr *sa; |
816 | int len; | |
817 | ||
d314774c | 818 | if (!ops->ndo_set_mac_address) { |
1da177e4 | 819 | err = -EOPNOTSUPP; |
0157f60c | 820 | goto errout; |
1da177e4 | 821 | } |
da5e0494 | 822 | |
1da177e4 LT |
823 | if (!netif_device_present(dev)) { |
824 | err = -ENODEV; | |
0157f60c | 825 | goto errout; |
1da177e4 | 826 | } |
1da177e4 | 827 | |
70f8e78e DM |
828 | len = sizeof(sa_family_t) + dev->addr_len; |
829 | sa = kmalloc(len, GFP_KERNEL); | |
830 | if (!sa) { | |
831 | err = -ENOMEM; | |
0157f60c | 832 | goto errout; |
70f8e78e DM |
833 | } |
834 | sa->sa_family = dev->type; | |
da5e0494 | 835 | memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]), |
70f8e78e | 836 | dev->addr_len); |
d314774c | 837 | err = ops->ndo_set_mac_address(dev, sa); |
70f8e78e | 838 | kfree(sa); |
1da177e4 | 839 | if (err) |
0157f60c | 840 | goto errout; |
1da177e4 | 841 | send_addr_notify = 1; |
da5e0494 | 842 | modified = 1; |
1da177e4 LT |
843 | } |
844 | ||
da5e0494 TG |
845 | if (tb[IFLA_MTU]) { |
846 | err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU])); | |
847 | if (err < 0) | |
0157f60c | 848 | goto errout; |
da5e0494 | 849 | modified = 1; |
1da177e4 LT |
850 | } |
851 | ||
da5e0494 TG |
852 | /* |
853 | * Interface selected by interface index but interface | |
854 | * name provided implies that a name change has been | |
855 | * requested. | |
856 | */ | |
51055be8 | 857 | if (ifm->ifi_index > 0 && ifname[0]) { |
da5e0494 TG |
858 | err = dev_change_name(dev, ifname); |
859 | if (err < 0) | |
0157f60c | 860 | goto errout; |
da5e0494 | 861 | modified = 1; |
1da177e4 LT |
862 | } |
863 | ||
0b815a1a SH |
864 | if (tb[IFLA_IFALIAS]) { |
865 | err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]), | |
866 | nla_len(tb[IFLA_IFALIAS])); | |
867 | if (err < 0) | |
868 | goto errout; | |
869 | modified = 1; | |
870 | } | |
871 | ||
da5e0494 TG |
872 | if (tb[IFLA_BROADCAST]) { |
873 | nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len); | |
874 | send_addr_notify = 1; | |
1da177e4 LT |
875 | } |
876 | ||
83b496e9 PM |
877 | if (ifm->ifi_flags || ifm->ifi_change) { |
878 | unsigned int flags = ifm->ifi_flags; | |
879 | ||
880 | /* bugwards compatibility: ifi_change == 0 is treated as ~0 */ | |
881 | if (ifm->ifi_change) | |
882 | flags = (flags & ifm->ifi_change) | | |
883 | (dev->flags & ~ifm->ifi_change); | |
5f9021cf JB |
884 | err = dev_change_flags(dev, flags); |
885 | if (err < 0) | |
886 | goto errout; | |
83b496e9 | 887 | } |
1da177e4 | 888 | |
93b2d4a2 DM |
889 | if (tb[IFLA_TXQLEN]) |
890 | dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]); | |
b00055aa | 891 | |
da5e0494 | 892 | if (tb[IFLA_OPERSTATE]) |
93b2d4a2 | 893 | set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); |
b00055aa | 894 | |
da5e0494 | 895 | if (tb[IFLA_LINKMODE]) { |
93b2d4a2 DM |
896 | write_lock_bh(&dev_base_lock); |
897 | dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]); | |
898 | write_unlock_bh(&dev_base_lock); | |
b00055aa SR |
899 | } |
900 | ||
1da177e4 LT |
901 | err = 0; |
902 | ||
0157f60c | 903 | errout: |
da5e0494 TG |
904 | if (err < 0 && modified && net_ratelimit()) |
905 | printk(KERN_WARNING "A link change request failed with " | |
906 | "some changes comitted already. Interface %s may " | |
907 | "have been left with an inconsistent configuration, " | |
908 | "please check.\n", dev->name); | |
909 | ||
1da177e4 LT |
910 | if (send_addr_notify) |
911 | call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); | |
0157f60c PM |
912 | return err; |
913 | } | |
1da177e4 | 914 | |
0157f60c PM |
915 | static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) |
916 | { | |
3b1e0a65 | 917 | struct net *net = sock_net(skb->sk); |
0157f60c PM |
918 | struct ifinfomsg *ifm; |
919 | struct net_device *dev; | |
920 | int err; | |
921 | struct nlattr *tb[IFLA_MAX+1]; | |
922 | char ifname[IFNAMSIZ]; | |
923 | ||
924 | err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); | |
925 | if (err < 0) | |
926 | goto errout; | |
927 | ||
928 | if (tb[IFLA_IFNAME]) | |
929 | nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); | |
930 | else | |
931 | ifname[0] = '\0'; | |
932 | ||
933 | err = -EINVAL; | |
934 | ifm = nlmsg_data(nlh); | |
935 | if (ifm->ifi_index > 0) | |
a3d12891 | 936 | dev = __dev_get_by_index(net, ifm->ifi_index); |
0157f60c | 937 | else if (tb[IFLA_IFNAME]) |
a3d12891 | 938 | dev = __dev_get_by_name(net, ifname); |
0157f60c PM |
939 | else |
940 | goto errout; | |
941 | ||
942 | if (dev == NULL) { | |
943 | err = -ENODEV; | |
944 | goto errout; | |
945 | } | |
946 | ||
e0d087af ED |
947 | err = validate_linkmsg(dev, tb); |
948 | if (err < 0) | |
a3d12891 | 949 | goto errout; |
0157f60c | 950 | |
38f7b870 | 951 | err = do_setlink(dev, ifm, tb, ifname, 0); |
da5e0494 | 952 | errout: |
1da177e4 LT |
953 | return err; |
954 | } | |
955 | ||
38f7b870 PM |
956 | static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) |
957 | { | |
3b1e0a65 | 958 | struct net *net = sock_net(skb->sk); |
38f7b870 PM |
959 | const struct rtnl_link_ops *ops; |
960 | struct net_device *dev; | |
961 | struct ifinfomsg *ifm; | |
962 | char ifname[IFNAMSIZ]; | |
963 | struct nlattr *tb[IFLA_MAX+1]; | |
964 | int err; | |
965 | ||
966 | err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); | |
967 | if (err < 0) | |
968 | return err; | |
969 | ||
970 | if (tb[IFLA_IFNAME]) | |
971 | nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); | |
972 | ||
973 | ifm = nlmsg_data(nlh); | |
974 | if (ifm->ifi_index > 0) | |
881d966b | 975 | dev = __dev_get_by_index(net, ifm->ifi_index); |
38f7b870 | 976 | else if (tb[IFLA_IFNAME]) |
881d966b | 977 | dev = __dev_get_by_name(net, ifname); |
38f7b870 PM |
978 | else |
979 | return -EINVAL; | |
980 | ||
981 | if (!dev) | |
982 | return -ENODEV; | |
983 | ||
984 | ops = dev->rtnl_link_ops; | |
985 | if (!ops) | |
986 | return -EOPNOTSUPP; | |
987 | ||
23289a37 | 988 | ops->dellink(dev, NULL); |
38f7b870 PM |
989 | return 0; |
990 | } | |
991 | ||
81adee47 EB |
992 | struct net_device *rtnl_create_link(struct net *src_net, struct net *net, |
993 | char *ifname, const struct rtnl_link_ops *ops, struct nlattr *tb[]) | |
e7199288 PE |
994 | { |
995 | int err; | |
996 | struct net_device *dev; | |
2e59af3d ED |
997 | unsigned int num_queues = 1; |
998 | unsigned int real_num_queues = 1; | |
e7199288 | 999 | |
2e59af3d | 1000 | if (ops->get_tx_queues) { |
81adee47 | 1001 | err = ops->get_tx_queues(src_net, tb, &num_queues, |
e0d087af | 1002 | &real_num_queues); |
2e59af3d ED |
1003 | if (err) |
1004 | goto err; | |
1005 | } | |
e7199288 | 1006 | err = -ENOMEM; |
2e59af3d | 1007 | dev = alloc_netdev_mq(ops->priv_size, ifname, ops->setup, num_queues); |
e7199288 PE |
1008 | if (!dev) |
1009 | goto err; | |
1010 | ||
81adee47 EB |
1011 | dev_net_set(dev, net); |
1012 | dev->rtnl_link_ops = ops; | |
2e59af3d | 1013 | dev->real_num_tx_queues = real_num_queues; |
81adee47 | 1014 | |
e7199288 PE |
1015 | if (strchr(dev->name, '%')) { |
1016 | err = dev_alloc_name(dev, dev->name); | |
1017 | if (err < 0) | |
1018 | goto err_free; | |
1019 | } | |
1020 | ||
e7199288 PE |
1021 | if (tb[IFLA_MTU]) |
1022 | dev->mtu = nla_get_u32(tb[IFLA_MTU]); | |
1023 | if (tb[IFLA_ADDRESS]) | |
1024 | memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]), | |
1025 | nla_len(tb[IFLA_ADDRESS])); | |
1026 | if (tb[IFLA_BROADCAST]) | |
1027 | memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]), | |
1028 | nla_len(tb[IFLA_BROADCAST])); | |
1029 | if (tb[IFLA_TXQLEN]) | |
1030 | dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]); | |
1031 | if (tb[IFLA_OPERSTATE]) | |
93b2d4a2 | 1032 | set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); |
e7199288 PE |
1033 | if (tb[IFLA_LINKMODE]) |
1034 | dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]); | |
1035 | ||
1036 | return dev; | |
1037 | ||
1038 | err_free: | |
1039 | free_netdev(dev); | |
1040 | err: | |
1041 | return ERR_PTR(err); | |
1042 | } | |
e0d087af | 1043 | EXPORT_SYMBOL(rtnl_create_link); |
e7199288 | 1044 | |
38f7b870 PM |
1045 | static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) |
1046 | { | |
3b1e0a65 | 1047 | struct net *net = sock_net(skb->sk); |
38f7b870 PM |
1048 | const struct rtnl_link_ops *ops; |
1049 | struct net_device *dev; | |
1050 | struct ifinfomsg *ifm; | |
1051 | char kind[MODULE_NAME_LEN]; | |
1052 | char ifname[IFNAMSIZ]; | |
1053 | struct nlattr *tb[IFLA_MAX+1]; | |
1054 | struct nlattr *linkinfo[IFLA_INFO_MAX+1]; | |
1055 | int err; | |
1056 | ||
95a5afca | 1057 | #ifdef CONFIG_MODULES |
38f7b870 | 1058 | replay: |
8072f085 | 1059 | #endif |
38f7b870 PM |
1060 | err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); |
1061 | if (err < 0) | |
1062 | return err; | |
1063 | ||
1064 | if (tb[IFLA_IFNAME]) | |
1065 | nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); | |
1066 | else | |
1067 | ifname[0] = '\0'; | |
1068 | ||
1069 | ifm = nlmsg_data(nlh); | |
1070 | if (ifm->ifi_index > 0) | |
881d966b | 1071 | dev = __dev_get_by_index(net, ifm->ifi_index); |
38f7b870 | 1072 | else if (ifname[0]) |
881d966b | 1073 | dev = __dev_get_by_name(net, ifname); |
38f7b870 PM |
1074 | else |
1075 | dev = NULL; | |
1076 | ||
e0d087af ED |
1077 | err = validate_linkmsg(dev, tb); |
1078 | if (err < 0) | |
1840bb13 TG |
1079 | return err; |
1080 | ||
38f7b870 PM |
1081 | if (tb[IFLA_LINKINFO]) { |
1082 | err = nla_parse_nested(linkinfo, IFLA_INFO_MAX, | |
1083 | tb[IFLA_LINKINFO], ifla_info_policy); | |
1084 | if (err < 0) | |
1085 | return err; | |
1086 | } else | |
1087 | memset(linkinfo, 0, sizeof(linkinfo)); | |
1088 | ||
1089 | if (linkinfo[IFLA_INFO_KIND]) { | |
1090 | nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind)); | |
1091 | ops = rtnl_link_ops_get(kind); | |
1092 | } else { | |
1093 | kind[0] = '\0'; | |
1094 | ops = NULL; | |
1095 | } | |
1096 | ||
1097 | if (1) { | |
1098 | struct nlattr *attr[ops ? ops->maxtype + 1 : 0], **data = NULL; | |
81adee47 | 1099 | struct net *dest_net; |
38f7b870 PM |
1100 | |
1101 | if (ops) { | |
1102 | if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) { | |
1103 | err = nla_parse_nested(attr, ops->maxtype, | |
1104 | linkinfo[IFLA_INFO_DATA], | |
1105 | ops->policy); | |
1106 | if (err < 0) | |
1107 | return err; | |
1108 | data = attr; | |
1109 | } | |
1110 | if (ops->validate) { | |
1111 | err = ops->validate(tb, data); | |
1112 | if (err < 0) | |
1113 | return err; | |
1114 | } | |
1115 | } | |
1116 | ||
1117 | if (dev) { | |
1118 | int modified = 0; | |
1119 | ||
1120 | if (nlh->nlmsg_flags & NLM_F_EXCL) | |
1121 | return -EEXIST; | |
1122 | if (nlh->nlmsg_flags & NLM_F_REPLACE) | |
1123 | return -EOPNOTSUPP; | |
1124 | ||
1125 | if (linkinfo[IFLA_INFO_DATA]) { | |
1126 | if (!ops || ops != dev->rtnl_link_ops || | |
1127 | !ops->changelink) | |
1128 | return -EOPNOTSUPP; | |
1129 | ||
1130 | err = ops->changelink(dev, tb, data); | |
1131 | if (err < 0) | |
1132 | return err; | |
1133 | modified = 1; | |
1134 | } | |
1135 | ||
1136 | return do_setlink(dev, ifm, tb, ifname, modified); | |
1137 | } | |
1138 | ||
1139 | if (!(nlh->nlmsg_flags & NLM_F_CREATE)) | |
1140 | return -ENODEV; | |
1141 | ||
1142 | if (ifm->ifi_index || ifm->ifi_flags || ifm->ifi_change) | |
1143 | return -EOPNOTSUPP; | |
0e06877c | 1144 | if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO]) |
38f7b870 PM |
1145 | return -EOPNOTSUPP; |
1146 | ||
1147 | if (!ops) { | |
95a5afca | 1148 | #ifdef CONFIG_MODULES |
38f7b870 PM |
1149 | if (kind[0]) { |
1150 | __rtnl_unlock(); | |
1151 | request_module("rtnl-link-%s", kind); | |
1152 | rtnl_lock(); | |
1153 | ops = rtnl_link_ops_get(kind); | |
1154 | if (ops) | |
1155 | goto replay; | |
1156 | } | |
1157 | #endif | |
1158 | return -EOPNOTSUPP; | |
1159 | } | |
1160 | ||
1161 | if (!ifname[0]) | |
1162 | snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind); | |
e7199288 | 1163 | |
81adee47 EB |
1164 | dest_net = rtnl_link_get_net(net, tb); |
1165 | dev = rtnl_create_link(net, dest_net, ifname, ops, tb); | |
e7199288 PE |
1166 | |
1167 | if (IS_ERR(dev)) | |
1168 | err = PTR_ERR(dev); | |
1169 | else if (ops->newlink) | |
81adee47 | 1170 | err = ops->newlink(net, dev, tb, data); |
2d85cba2 PM |
1171 | else |
1172 | err = register_netdevice(dev); | |
e7199288 | 1173 | if (err < 0 && !IS_ERR(dev)) |
38f7b870 | 1174 | free_netdev(dev); |
81adee47 EB |
1175 | |
1176 | put_net(dest_net); | |
38f7b870 PM |
1177 | return err; |
1178 | } | |
1179 | } | |
1180 | ||
b60c5115 | 1181 | static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
711e2c33 | 1182 | { |
3b1e0a65 | 1183 | struct net *net = sock_net(skb->sk); |
b60c5115 | 1184 | struct ifinfomsg *ifm; |
a3d12891 | 1185 | char ifname[IFNAMSIZ]; |
b60c5115 TG |
1186 | struct nlattr *tb[IFLA_MAX+1]; |
1187 | struct net_device *dev = NULL; | |
1188 | struct sk_buff *nskb; | |
339bf98f | 1189 | int err; |
711e2c33 | 1190 | |
b60c5115 TG |
1191 | err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); |
1192 | if (err < 0) | |
9918f230 | 1193 | return err; |
b60c5115 | 1194 | |
a3d12891 ED |
1195 | if (tb[IFLA_IFNAME]) |
1196 | nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); | |
1197 | ||
b60c5115 | 1198 | ifm = nlmsg_data(nlh); |
a3d12891 ED |
1199 | if (ifm->ifi_index > 0) |
1200 | dev = __dev_get_by_index(net, ifm->ifi_index); | |
1201 | else if (tb[IFLA_IFNAME]) | |
1202 | dev = __dev_get_by_name(net, ifname); | |
1203 | else | |
711e2c33 | 1204 | return -EINVAL; |
711e2c33 | 1205 | |
a3d12891 ED |
1206 | if (dev == NULL) |
1207 | return -ENODEV; | |
1208 | ||
38f7b870 | 1209 | nskb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL); |
a3d12891 ED |
1210 | if (nskb == NULL) |
1211 | return -ENOBUFS; | |
b60c5115 | 1212 | |
575c3e2a PM |
1213 | err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).pid, |
1214 | nlh->nlmsg_seq, 0, 0); | |
26932566 PM |
1215 | if (err < 0) { |
1216 | /* -EMSGSIZE implies BUG in if_nlmsg_size */ | |
1217 | WARN_ON(err == -EMSGSIZE); | |
1218 | kfree_skb(nskb); | |
a3d12891 ED |
1219 | } else |
1220 | err = rtnl_unicast(nskb, net, NETLINK_CB(skb).pid); | |
711e2c33 | 1221 | |
b60c5115 | 1222 | return err; |
711e2c33 | 1223 | } |
711e2c33 | 1224 | |
42bad1da | 1225 | static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb) |
1da177e4 LT |
1226 | { |
1227 | int idx; | |
1228 | int s_idx = cb->family; | |
1229 | ||
1230 | if (s_idx == 0) | |
1231 | s_idx = 1; | |
e0d087af | 1232 | for (idx = 1; idx < NPROTO; idx++) { |
1da177e4 LT |
1233 | int type = cb->nlh->nlmsg_type-RTM_BASE; |
1234 | if (idx < s_idx || idx == PF_PACKET) | |
1235 | continue; | |
e2849863 TG |
1236 | if (rtnl_msg_handlers[idx] == NULL || |
1237 | rtnl_msg_handlers[idx][type].dumpit == NULL) | |
1da177e4 LT |
1238 | continue; |
1239 | if (idx > s_idx) | |
1240 | memset(&cb->args[0], 0, sizeof(cb->args)); | |
e2849863 | 1241 | if (rtnl_msg_handlers[idx][type].dumpit(skb, cb)) |
1da177e4 LT |
1242 | break; |
1243 | } | |
1244 | cb->family = idx; | |
1245 | ||
1246 | return skb->len; | |
1247 | } | |
1248 | ||
1249 | void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change) | |
1250 | { | |
c346dca1 | 1251 | struct net *net = dev_net(dev); |
1da177e4 | 1252 | struct sk_buff *skb; |
0ec6d3f4 | 1253 | int err = -ENOBUFS; |
1da177e4 | 1254 | |
38f7b870 | 1255 | skb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL); |
0ec6d3f4 TG |
1256 | if (skb == NULL) |
1257 | goto errout; | |
1da177e4 | 1258 | |
575c3e2a | 1259 | err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0); |
26932566 PM |
1260 | if (err < 0) { |
1261 | /* -EMSGSIZE implies BUG in if_nlmsg_size() */ | |
1262 | WARN_ON(err == -EMSGSIZE); | |
1263 | kfree_skb(skb); | |
1264 | goto errout; | |
1265 | } | |
1ce85fe4 PNA |
1266 | rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_KERNEL); |
1267 | return; | |
0ec6d3f4 TG |
1268 | errout: |
1269 | if (err < 0) | |
4b3da706 | 1270 | rtnl_set_sk_err(net, RTNLGRP_LINK, err); |
1da177e4 LT |
1271 | } |
1272 | ||
1da177e4 LT |
1273 | /* Protected by RTNL sempahore. */ |
1274 | static struct rtattr **rta_buf; | |
1275 | static int rtattr_max; | |
1276 | ||
1277 | /* Process one rtnetlink message. */ | |
1278 | ||
1d00a4eb | 1279 | static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) |
1da177e4 | 1280 | { |
3b1e0a65 | 1281 | struct net *net = sock_net(skb->sk); |
e2849863 | 1282 | rtnl_doit_func doit; |
1da177e4 LT |
1283 | int sz_idx, kind; |
1284 | int min_len; | |
1285 | int family; | |
1286 | int type; | |
1c2d670f | 1287 | int err; |
1da177e4 | 1288 | |
1da177e4 | 1289 | type = nlh->nlmsg_type; |
1da177e4 | 1290 | if (type > RTM_MAX) |
038890fe | 1291 | return -EOPNOTSUPP; |
1da177e4 LT |
1292 | |
1293 | type -= RTM_BASE; | |
1294 | ||
1295 | /* All the messages must have at least 1 byte length */ | |
1296 | if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg))) | |
1297 | return 0; | |
1298 | ||
e0d087af | 1299 | family = ((struct rtgenmsg *)NLMSG_DATA(nlh))->rtgen_family; |
1d00a4eb TG |
1300 | if (family >= NPROTO) |
1301 | return -EAFNOSUPPORT; | |
1da177e4 | 1302 | |
1da177e4 LT |
1303 | sz_idx = type>>2; |
1304 | kind = type&3; | |
1305 | ||
1d00a4eb TG |
1306 | if (kind != 2 && security_netlink_recv(skb, CAP_NET_ADMIN)) |
1307 | return -EPERM; | |
1da177e4 LT |
1308 | |
1309 | if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) { | |
97c53cac | 1310 | struct sock *rtnl; |
e2849863 | 1311 | rtnl_dumpit_func dumpit; |
1da177e4 | 1312 | |
e2849863 TG |
1313 | dumpit = rtnl_get_dumpit(family, type); |
1314 | if (dumpit == NULL) | |
038890fe | 1315 | return -EOPNOTSUPP; |
9ac4a169 | 1316 | |
1c2d670f | 1317 | __rtnl_unlock(); |
97c53cac | 1318 | rtnl = net->rtnl; |
1c2d670f PM |
1319 | err = netlink_dump_start(rtnl, skb, nlh, dumpit, NULL); |
1320 | rtnl_lock(); | |
1321 | return err; | |
1da177e4 LT |
1322 | } |
1323 | ||
1324 | memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *))); | |
1325 | ||
1326 | min_len = rtm_min[sz_idx]; | |
1327 | if (nlh->nlmsg_len < min_len) | |
1d00a4eb | 1328 | return -EINVAL; |
1da177e4 LT |
1329 | |
1330 | if (nlh->nlmsg_len > min_len) { | |
1331 | int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len); | |
e0d087af | 1332 | struct rtattr *attr = (void *)nlh + NLMSG_ALIGN(min_len); |
1da177e4 LT |
1333 | |
1334 | while (RTA_OK(attr, attrlen)) { | |
1335 | unsigned flavor = attr->rta_type; | |
1336 | if (flavor) { | |
1337 | if (flavor > rta_max[sz_idx]) | |
1d00a4eb | 1338 | return -EINVAL; |
1da177e4 LT |
1339 | rta_buf[flavor-1] = attr; |
1340 | } | |
1341 | attr = RTA_NEXT(attr, attrlen); | |
1342 | } | |
1343 | } | |
1344 | ||
e2849863 TG |
1345 | doit = rtnl_get_doit(family, type); |
1346 | if (doit == NULL) | |
038890fe | 1347 | return -EOPNOTSUPP; |
1da177e4 | 1348 | |
1d00a4eb | 1349 | return doit(skb, nlh, (void *)&rta_buf[0]); |
1da177e4 LT |
1350 | } |
1351 | ||
cd40b7d3 | 1352 | static void rtnetlink_rcv(struct sk_buff *skb) |
1da177e4 | 1353 | { |
cd40b7d3 DL |
1354 | rtnl_lock(); |
1355 | netlink_rcv_skb(skb, &rtnetlink_rcv_msg); | |
1356 | rtnl_unlock(); | |
1da177e4 LT |
1357 | } |
1358 | ||
1da177e4 LT |
1359 | static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr) |
1360 | { | |
1361 | struct net_device *dev = ptr; | |
e9dc8653 | 1362 | |
1da177e4 LT |
1363 | switch (event) { |
1364 | case NETDEV_UNREGISTER: | |
1365 | rtmsg_ifinfo(RTM_DELLINK, dev, ~0U); | |
1366 | break; | |
1367 | case NETDEV_REGISTER: | |
1368 | rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U); | |
1369 | break; | |
1370 | case NETDEV_UP: | |
1371 | case NETDEV_DOWN: | |
1372 | rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING); | |
1373 | break; | |
1374 | case NETDEV_CHANGE: | |
1375 | case NETDEV_GOING_DOWN: | |
1376 | break; | |
1377 | default: | |
1378 | rtmsg_ifinfo(RTM_NEWLINK, dev, 0); | |
1379 | break; | |
1380 | } | |
1381 | return NOTIFY_DONE; | |
1382 | } | |
1383 | ||
1384 | static struct notifier_block rtnetlink_dev_notifier = { | |
1385 | .notifier_call = rtnetlink_event, | |
1386 | }; | |
1387 | ||
97c53cac DL |
1388 | |
1389 | static int rtnetlink_net_init(struct net *net) | |
1390 | { | |
1391 | struct sock *sk; | |
1392 | sk = netlink_kernel_create(net, NETLINK_ROUTE, RTNLGRP_MAX, | |
1393 | rtnetlink_rcv, &rtnl_mutex, THIS_MODULE); | |
1394 | if (!sk) | |
1395 | return -ENOMEM; | |
97c53cac DL |
1396 | net->rtnl = sk; |
1397 | return 0; | |
1398 | } | |
1399 | ||
1400 | static void rtnetlink_net_exit(struct net *net) | |
1401 | { | |
775516bf DL |
1402 | netlink_kernel_release(net->rtnl); |
1403 | net->rtnl = NULL; | |
97c53cac DL |
1404 | } |
1405 | ||
1406 | static struct pernet_operations rtnetlink_net_ops = { | |
1407 | .init = rtnetlink_net_init, | |
1408 | .exit = rtnetlink_net_exit, | |
1409 | }; | |
1410 | ||
1da177e4 LT |
1411 | void __init rtnetlink_init(void) |
1412 | { | |
1413 | int i; | |
1414 | ||
1415 | rtattr_max = 0; | |
1416 | for (i = 0; i < ARRAY_SIZE(rta_max); i++) | |
1417 | if (rta_max[i] > rtattr_max) | |
1418 | rtattr_max = rta_max[i]; | |
1419 | rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL); | |
1420 | if (!rta_buf) | |
1421 | panic("rtnetlink_init: cannot allocate rta_buf\n"); | |
1422 | ||
97c53cac | 1423 | if (register_pernet_subsys(&rtnetlink_net_ops)) |
1da177e4 | 1424 | panic("rtnetlink_init: cannot initialize rtnetlink\n"); |
97c53cac | 1425 | |
1da177e4 LT |
1426 | netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV); |
1427 | register_netdevice_notifier(&rtnetlink_dev_notifier); | |
340d17fc TG |
1428 | |
1429 | rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink, rtnl_dump_ifinfo); | |
1430 | rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL); | |
38f7b870 PM |
1431 | rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL); |
1432 | rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL); | |
687ad8cc TG |
1433 | |
1434 | rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all); | |
1435 | rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all); | |
1da177e4 LT |
1436 | } |
1437 |