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> | |
41 | #include <asm/string.h> | |
42 | ||
43 | #include <linux/inet.h> | |
44 | #include <linux/netdevice.h> | |
45 | #include <net/ip.h> | |
46 | #include <net/protocol.h> | |
47 | #include <net/arp.h> | |
48 | #include <net/route.h> | |
49 | #include <net/udp.h> | |
50 | #include <net/sock.h> | |
51 | #include <net/pkt_sched.h> | |
14c0b97d | 52 | #include <net/fib_rules.h> |
e2849863 | 53 | #include <net/rtnetlink.h> |
30ffee84 | 54 | #include <net/net_namespace.h> |
1da177e4 | 55 | |
e2849863 TG |
56 | struct rtnl_link |
57 | { | |
58 | rtnl_doit_func doit; | |
59 | rtnl_dumpit_func dumpit; | |
60 | }; | |
61 | ||
6756ae4b | 62 | static DEFINE_MUTEX(rtnl_mutex); |
1da177e4 LT |
63 | |
64 | void rtnl_lock(void) | |
65 | { | |
6756ae4b | 66 | mutex_lock(&rtnl_mutex); |
1da177e4 LT |
67 | } |
68 | ||
6756ae4b | 69 | void __rtnl_unlock(void) |
1da177e4 | 70 | { |
6756ae4b | 71 | mutex_unlock(&rtnl_mutex); |
1da177e4 | 72 | } |
6756ae4b | 73 | |
1da177e4 LT |
74 | void rtnl_unlock(void) |
75 | { | |
58ec3b4d | 76 | /* This fellow will unlock it for us. */ |
1da177e4 LT |
77 | netdev_run_todo(); |
78 | } | |
79 | ||
6756ae4b SH |
80 | int rtnl_trylock(void) |
81 | { | |
82 | return mutex_trylock(&rtnl_mutex); | |
83 | } | |
84 | ||
c9c1014b PM |
85 | int rtnl_is_locked(void) |
86 | { | |
87 | return mutex_is_locked(&rtnl_mutex); | |
88 | } | |
89 | ||
42bad1da | 90 | static struct rtnl_link *rtnl_msg_handlers[NPROTO]; |
e2849863 TG |
91 | |
92 | static inline int rtm_msgindex(int msgtype) | |
93 | { | |
94 | int msgindex = msgtype - RTM_BASE; | |
95 | ||
96 | /* | |
97 | * msgindex < 0 implies someone tried to register a netlink | |
98 | * control code. msgindex >= RTM_NR_MSGTYPES may indicate that | |
99 | * the message type has not been added to linux/rtnetlink.h | |
100 | */ | |
101 | BUG_ON(msgindex < 0 || msgindex >= RTM_NR_MSGTYPES); | |
102 | ||
103 | return msgindex; | |
104 | } | |
105 | ||
106 | static rtnl_doit_func rtnl_get_doit(int protocol, int msgindex) | |
107 | { | |
108 | struct rtnl_link *tab; | |
109 | ||
110 | tab = rtnl_msg_handlers[protocol]; | |
51057f2f | 111 | if (tab == NULL || tab[msgindex].doit == NULL) |
e2849863 TG |
112 | tab = rtnl_msg_handlers[PF_UNSPEC]; |
113 | ||
51057f2f | 114 | return tab ? tab[msgindex].doit : NULL; |
e2849863 TG |
115 | } |
116 | ||
117 | static rtnl_dumpit_func rtnl_get_dumpit(int protocol, int msgindex) | |
118 | { | |
119 | struct rtnl_link *tab; | |
120 | ||
121 | tab = rtnl_msg_handlers[protocol]; | |
51057f2f | 122 | if (tab == NULL || tab[msgindex].dumpit == NULL) |
e2849863 TG |
123 | tab = rtnl_msg_handlers[PF_UNSPEC]; |
124 | ||
51057f2f | 125 | return tab ? tab[msgindex].dumpit : NULL; |
e2849863 TG |
126 | } |
127 | ||
128 | /** | |
129 | * __rtnl_register - Register a rtnetlink message type | |
130 | * @protocol: Protocol family or PF_UNSPEC | |
131 | * @msgtype: rtnetlink message type | |
132 | * @doit: Function pointer called for each request message | |
133 | * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message | |
134 | * | |
135 | * Registers the specified function pointers (at least one of them has | |
136 | * to be non-NULL) to be called whenever a request message for the | |
137 | * specified protocol family and message type is received. | |
138 | * | |
139 | * The special protocol family PF_UNSPEC may be used to define fallback | |
140 | * function pointers for the case when no entry for the specific protocol | |
141 | * family exists. | |
142 | * | |
143 | * Returns 0 on success or a negative error code. | |
144 | */ | |
145 | int __rtnl_register(int protocol, int msgtype, | |
146 | rtnl_doit_func doit, rtnl_dumpit_func dumpit) | |
147 | { | |
148 | struct rtnl_link *tab; | |
149 | int msgindex; | |
150 | ||
151 | BUG_ON(protocol < 0 || protocol >= NPROTO); | |
152 | msgindex = rtm_msgindex(msgtype); | |
153 | ||
154 | tab = rtnl_msg_handlers[protocol]; | |
155 | if (tab == NULL) { | |
156 | tab = kcalloc(RTM_NR_MSGTYPES, sizeof(*tab), GFP_KERNEL); | |
157 | if (tab == NULL) | |
158 | return -ENOBUFS; | |
159 | ||
160 | rtnl_msg_handlers[protocol] = tab; | |
161 | } | |
162 | ||
163 | if (doit) | |
164 | tab[msgindex].doit = doit; | |
165 | ||
166 | if (dumpit) | |
167 | tab[msgindex].dumpit = dumpit; | |
168 | ||
169 | return 0; | |
170 | } | |
171 | ||
172 | EXPORT_SYMBOL_GPL(__rtnl_register); | |
173 | ||
174 | /** | |
175 | * rtnl_register - Register a rtnetlink message type | |
176 | * | |
177 | * Identical to __rtnl_register() but panics on failure. This is useful | |
178 | * as failure of this function is very unlikely, it can only happen due | |
179 | * to lack of memory when allocating the chain to store all message | |
180 | * handlers for a protocol. Meant for use in init functions where lack | |
181 | * of memory implies no sense in continueing. | |
182 | */ | |
183 | void rtnl_register(int protocol, int msgtype, | |
184 | rtnl_doit_func doit, rtnl_dumpit_func dumpit) | |
185 | { | |
186 | if (__rtnl_register(protocol, msgtype, doit, dumpit) < 0) | |
187 | panic("Unable to register rtnetlink message handler, " | |
188 | "protocol = %d, message type = %d\n", | |
189 | protocol, msgtype); | |
190 | } | |
191 | ||
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 | } | |
216 | ||
217 | EXPORT_SYMBOL_GPL(rtnl_unregister); | |
218 | ||
219 | /** | |
220 | * rtnl_unregister_all - Unregister all rtnetlink message type of a protocol | |
221 | * @protocol : Protocol family or PF_UNSPEC | |
222 | * | |
223 | * Identical to calling rtnl_unregster() for all registered message types | |
224 | * of a certain protocol family. | |
225 | */ | |
226 | void rtnl_unregister_all(int protocol) | |
227 | { | |
228 | BUG_ON(protocol < 0 || protocol >= NPROTO); | |
229 | ||
230 | kfree(rtnl_msg_handlers[protocol]); | |
231 | rtnl_msg_handlers[protocol] = NULL; | |
232 | } | |
233 | ||
234 | EXPORT_SYMBOL_GPL(rtnl_unregister_all); | |
1da177e4 | 235 | |
38f7b870 PM |
236 | static LIST_HEAD(link_ops); |
237 | ||
238 | /** | |
239 | * __rtnl_link_register - Register rtnl_link_ops with rtnetlink. | |
240 | * @ops: struct rtnl_link_ops * to register | |
241 | * | |
242 | * The caller must hold the rtnl_mutex. This function should be used | |
243 | * by drivers that create devices during module initialization. It | |
244 | * must be called before registering the devices. | |
245 | * | |
246 | * Returns 0 on success or a negative error code. | |
247 | */ | |
248 | int __rtnl_link_register(struct rtnl_link_ops *ops) | |
249 | { | |
2d85cba2 PM |
250 | if (!ops->dellink) |
251 | ops->dellink = unregister_netdevice; | |
252 | ||
38f7b870 PM |
253 | list_add_tail(&ops->list, &link_ops); |
254 | return 0; | |
255 | } | |
256 | ||
257 | EXPORT_SYMBOL_GPL(__rtnl_link_register); | |
258 | ||
259 | /** | |
260 | * rtnl_link_register - Register rtnl_link_ops with rtnetlink. | |
261 | * @ops: struct rtnl_link_ops * to register | |
262 | * | |
263 | * Returns 0 on success or a negative error code. | |
264 | */ | |
265 | int rtnl_link_register(struct rtnl_link_ops *ops) | |
266 | { | |
267 | int err; | |
268 | ||
269 | rtnl_lock(); | |
270 | err = __rtnl_link_register(ops); | |
271 | rtnl_unlock(); | |
272 | return err; | |
273 | } | |
274 | ||
275 | EXPORT_SYMBOL_GPL(rtnl_link_register); | |
276 | ||
669f87ba PE |
277 | static void __rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops) |
278 | { | |
279 | struct net_device *dev; | |
280 | restart: | |
281 | for_each_netdev(net, dev) { | |
282 | if (dev->rtnl_link_ops == ops) { | |
283 | ops->dellink(dev); | |
284 | goto restart; | |
285 | } | |
286 | } | |
287 | } | |
288 | ||
289 | void rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops) | |
290 | { | |
291 | rtnl_lock(); | |
292 | __rtnl_kill_links(net, ops); | |
293 | rtnl_unlock(); | |
294 | } | |
295 | EXPORT_SYMBOL_GPL(rtnl_kill_links); | |
296 | ||
38f7b870 PM |
297 | /** |
298 | * __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink. | |
299 | * @ops: struct rtnl_link_ops * to unregister | |
300 | * | |
2d85cba2 | 301 | * The caller must hold the rtnl_mutex. |
38f7b870 PM |
302 | */ |
303 | void __rtnl_link_unregister(struct rtnl_link_ops *ops) | |
304 | { | |
881d966b | 305 | struct net *net; |
2d85cba2 | 306 | |
881d966b | 307 | for_each_net(net) { |
669f87ba | 308 | __rtnl_kill_links(net, ops); |
2d85cba2 | 309 | } |
38f7b870 PM |
310 | list_del(&ops->list); |
311 | } | |
312 | ||
313 | EXPORT_SYMBOL_GPL(__rtnl_link_unregister); | |
314 | ||
315 | /** | |
316 | * rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink. | |
317 | * @ops: struct rtnl_link_ops * to unregister | |
318 | */ | |
319 | void rtnl_link_unregister(struct rtnl_link_ops *ops) | |
320 | { | |
321 | rtnl_lock(); | |
322 | __rtnl_link_unregister(ops); | |
323 | rtnl_unlock(); | |
324 | } | |
325 | ||
326 | EXPORT_SYMBOL_GPL(rtnl_link_unregister); | |
327 | ||
328 | static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind) | |
329 | { | |
330 | const struct rtnl_link_ops *ops; | |
331 | ||
332 | list_for_each_entry(ops, &link_ops, list) { | |
333 | if (!strcmp(ops->kind, kind)) | |
334 | return ops; | |
335 | } | |
336 | return NULL; | |
337 | } | |
338 | ||
339 | static size_t rtnl_link_get_size(const struct net_device *dev) | |
340 | { | |
341 | const struct rtnl_link_ops *ops = dev->rtnl_link_ops; | |
342 | size_t size; | |
343 | ||
344 | if (!ops) | |
345 | return 0; | |
346 | ||
347 | size = nlmsg_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */ | |
348 | nlmsg_total_size(strlen(ops->kind) + 1); /* IFLA_INFO_KIND */ | |
349 | ||
350 | if (ops->get_size) | |
351 | /* IFLA_INFO_DATA + nested data */ | |
352 | size += nlmsg_total_size(sizeof(struct nlattr)) + | |
353 | ops->get_size(dev); | |
354 | ||
355 | if (ops->get_xstats_size) | |
356 | size += ops->get_xstats_size(dev); /* IFLA_INFO_XSTATS */ | |
357 | ||
358 | return size; | |
359 | } | |
360 | ||
361 | static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev) | |
362 | { | |
363 | const struct rtnl_link_ops *ops = dev->rtnl_link_ops; | |
364 | struct nlattr *linkinfo, *data; | |
365 | int err = -EMSGSIZE; | |
366 | ||
367 | linkinfo = nla_nest_start(skb, IFLA_LINKINFO); | |
368 | if (linkinfo == NULL) | |
369 | goto out; | |
370 | ||
371 | if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0) | |
372 | goto err_cancel_link; | |
373 | if (ops->fill_xstats) { | |
374 | err = ops->fill_xstats(skb, dev); | |
375 | if (err < 0) | |
376 | goto err_cancel_link; | |
377 | } | |
378 | if (ops->fill_info) { | |
379 | data = nla_nest_start(skb, IFLA_INFO_DATA); | |
380 | if (data == NULL) | |
381 | goto err_cancel_link; | |
382 | err = ops->fill_info(skb, dev); | |
383 | if (err < 0) | |
384 | goto err_cancel_data; | |
385 | nla_nest_end(skb, data); | |
386 | } | |
387 | ||
388 | nla_nest_end(skb, linkinfo); | |
389 | return 0; | |
390 | ||
391 | err_cancel_data: | |
392 | nla_nest_cancel(skb, data); | |
393 | err_cancel_link: | |
394 | nla_nest_cancel(skb, linkinfo); | |
395 | out: | |
396 | return err; | |
397 | } | |
398 | ||
db46edc6 | 399 | static const int rtm_min[RTM_NR_FAMILIES] = |
1da177e4 | 400 | { |
f90a0a74 TG |
401 | [RTM_FAM(RTM_NEWLINK)] = NLMSG_LENGTH(sizeof(struct ifinfomsg)), |
402 | [RTM_FAM(RTM_NEWADDR)] = NLMSG_LENGTH(sizeof(struct ifaddrmsg)), | |
403 | [RTM_FAM(RTM_NEWROUTE)] = NLMSG_LENGTH(sizeof(struct rtmsg)), | |
14c0b97d | 404 | [RTM_FAM(RTM_NEWRULE)] = NLMSG_LENGTH(sizeof(struct fib_rule_hdr)), |
f90a0a74 TG |
405 | [RTM_FAM(RTM_NEWQDISC)] = NLMSG_LENGTH(sizeof(struct tcmsg)), |
406 | [RTM_FAM(RTM_NEWTCLASS)] = NLMSG_LENGTH(sizeof(struct tcmsg)), | |
407 | [RTM_FAM(RTM_NEWTFILTER)] = NLMSG_LENGTH(sizeof(struct tcmsg)), | |
408 | [RTM_FAM(RTM_NEWACTION)] = NLMSG_LENGTH(sizeof(struct tcamsg)), | |
f90a0a74 TG |
409 | [RTM_FAM(RTM_GETMULTICAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)), |
410 | [RTM_FAM(RTM_GETANYCAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)), | |
1da177e4 LT |
411 | }; |
412 | ||
db46edc6 | 413 | static const int rta_max[RTM_NR_FAMILIES] = |
1da177e4 | 414 | { |
f90a0a74 TG |
415 | [RTM_FAM(RTM_NEWLINK)] = IFLA_MAX, |
416 | [RTM_FAM(RTM_NEWADDR)] = IFA_MAX, | |
417 | [RTM_FAM(RTM_NEWROUTE)] = RTA_MAX, | |
14c0b97d | 418 | [RTM_FAM(RTM_NEWRULE)] = FRA_MAX, |
f90a0a74 TG |
419 | [RTM_FAM(RTM_NEWQDISC)] = TCA_MAX, |
420 | [RTM_FAM(RTM_NEWTCLASS)] = TCA_MAX, | |
421 | [RTM_FAM(RTM_NEWTFILTER)] = TCA_MAX, | |
422 | [RTM_FAM(RTM_NEWACTION)] = TCAA_MAX, | |
1da177e4 LT |
423 | }; |
424 | ||
425 | void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const void *data) | |
426 | { | |
427 | struct rtattr *rta; | |
428 | int size = RTA_LENGTH(attrlen); | |
429 | ||
430 | rta = (struct rtattr*)skb_put(skb, RTA_ALIGN(size)); | |
431 | rta->rta_type = attrtype; | |
432 | rta->rta_len = size; | |
433 | memcpy(RTA_DATA(rta), data, attrlen); | |
b3563c4f | 434 | memset(RTA_DATA(rta) + attrlen, 0, RTA_ALIGN(size) - size); |
1da177e4 LT |
435 | } |
436 | ||
97c53cac | 437 | int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned group, int echo) |
1da177e4 | 438 | { |
97c53cac | 439 | struct sock *rtnl = net->rtnl; |
1da177e4 LT |
440 | int err = 0; |
441 | ||
ac6d439d | 442 | NETLINK_CB(skb).dst_group = group; |
1da177e4 LT |
443 | if (echo) |
444 | atomic_inc(&skb->users); | |
445 | netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL); | |
446 | if (echo) | |
447 | err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT); | |
448 | return err; | |
449 | } | |
450 | ||
97c53cac | 451 | int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid) |
2942e900 | 452 | { |
97c53cac DL |
453 | struct sock *rtnl = net->rtnl; |
454 | ||
2942e900 TG |
455 | return nlmsg_unicast(rtnl, skb, pid); |
456 | } | |
457 | ||
1ce85fe4 PNA |
458 | void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group, |
459 | struct nlmsghdr *nlh, gfp_t flags) | |
97676b6b | 460 | { |
97c53cac | 461 | struct sock *rtnl = net->rtnl; |
97676b6b TG |
462 | int report = 0; |
463 | ||
464 | if (nlh) | |
465 | report = nlmsg_report(nlh); | |
466 | ||
1ce85fe4 | 467 | nlmsg_notify(rtnl, skb, pid, group, report, flags); |
97676b6b TG |
468 | } |
469 | ||
97c53cac | 470 | void rtnl_set_sk_err(struct net *net, u32 group, int error) |
97676b6b | 471 | { |
97c53cac DL |
472 | struct sock *rtnl = net->rtnl; |
473 | ||
97676b6b TG |
474 | netlink_set_err(rtnl, 0, group, error); |
475 | } | |
476 | ||
1da177e4 LT |
477 | int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics) |
478 | { | |
2d7202bf TG |
479 | struct nlattr *mx; |
480 | int i, valid = 0; | |
481 | ||
482 | mx = nla_nest_start(skb, RTA_METRICS); | |
483 | if (mx == NULL) | |
484 | return -ENOBUFS; | |
485 | ||
486 | for (i = 0; i < RTAX_MAX; i++) { | |
487 | if (metrics[i]) { | |
488 | valid++; | |
489 | NLA_PUT_U32(skb, i+1, metrics[i]); | |
490 | } | |
1da177e4 | 491 | } |
1da177e4 | 492 | |
a57d27fc DM |
493 | if (!valid) { |
494 | nla_nest_cancel(skb, mx); | |
495 | return 0; | |
496 | } | |
2d7202bf TG |
497 | |
498 | return nla_nest_end(skb, mx); | |
499 | ||
500 | nla_put_failure: | |
bc3ed28c TG |
501 | nla_nest_cancel(skb, mx); |
502 | return -EMSGSIZE; | |
1da177e4 LT |
503 | } |
504 | ||
e3703b3d TG |
505 | int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id, |
506 | u32 ts, u32 tsage, long expires, u32 error) | |
507 | { | |
508 | struct rta_cacheinfo ci = { | |
509 | .rta_lastuse = jiffies_to_clock_t(jiffies - dst->lastuse), | |
510 | .rta_used = dst->__use, | |
511 | .rta_clntref = atomic_read(&(dst->__refcnt)), | |
512 | .rta_error = error, | |
513 | .rta_id = id, | |
514 | .rta_ts = ts, | |
515 | .rta_tsage = tsage, | |
516 | }; | |
517 | ||
518 | if (expires) | |
519 | ci.rta_expires = jiffies_to_clock_t(expires); | |
520 | ||
521 | return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci); | |
522 | } | |
523 | ||
524 | EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo); | |
1da177e4 | 525 | |
93b2d4a2 | 526 | static void set_operstate(struct net_device *dev, unsigned char transition) |
b00055aa SR |
527 | { |
528 | unsigned char operstate = dev->operstate; | |
529 | ||
530 | switch(transition) { | |
531 | case IF_OPER_UP: | |
532 | if ((operstate == IF_OPER_DORMANT || | |
533 | operstate == IF_OPER_UNKNOWN) && | |
534 | !netif_dormant(dev)) | |
535 | operstate = IF_OPER_UP; | |
536 | break; | |
537 | ||
538 | case IF_OPER_DORMANT: | |
539 | if (operstate == IF_OPER_UP || | |
540 | operstate == IF_OPER_UNKNOWN) | |
541 | operstate = IF_OPER_DORMANT; | |
542 | break; | |
3ff50b79 | 543 | } |
b00055aa SR |
544 | |
545 | if (dev->operstate != operstate) { | |
546 | write_lock_bh(&dev_base_lock); | |
547 | dev->operstate = operstate; | |
548 | write_unlock_bh(&dev_base_lock); | |
93b2d4a2 DM |
549 | netdev_state_change(dev); |
550 | } | |
b00055aa SR |
551 | } |
552 | ||
b60c5115 | 553 | static void copy_rtnl_link_stats(struct rtnl_link_stats *a, |
eeda3fd6 | 554 | const struct net_device_stats *b) |
1da177e4 | 555 | { |
b60c5115 TG |
556 | a->rx_packets = b->rx_packets; |
557 | a->tx_packets = b->tx_packets; | |
558 | a->rx_bytes = b->rx_bytes; | |
559 | a->tx_bytes = b->tx_bytes; | |
560 | a->rx_errors = b->rx_errors; | |
561 | a->tx_errors = b->tx_errors; | |
562 | a->rx_dropped = b->rx_dropped; | |
563 | a->tx_dropped = b->tx_dropped; | |
564 | ||
565 | a->multicast = b->multicast; | |
566 | a->collisions = b->collisions; | |
567 | ||
568 | a->rx_length_errors = b->rx_length_errors; | |
569 | a->rx_over_errors = b->rx_over_errors; | |
570 | a->rx_crc_errors = b->rx_crc_errors; | |
571 | a->rx_frame_errors = b->rx_frame_errors; | |
572 | a->rx_fifo_errors = b->rx_fifo_errors; | |
573 | a->rx_missed_errors = b->rx_missed_errors; | |
574 | ||
575 | a->tx_aborted_errors = b->tx_aborted_errors; | |
576 | a->tx_carrier_errors = b->tx_carrier_errors; | |
577 | a->tx_fifo_errors = b->tx_fifo_errors; | |
578 | a->tx_heartbeat_errors = b->tx_heartbeat_errors; | |
579 | a->tx_window_errors = b->tx_window_errors; | |
580 | ||
581 | a->rx_compressed = b->rx_compressed; | |
582 | a->tx_compressed = b->tx_compressed; | |
583 | }; | |
1da177e4 | 584 | |
38f7b870 | 585 | static inline size_t if_nlmsg_size(const struct net_device *dev) |
339bf98f TG |
586 | { |
587 | return NLMSG_ALIGN(sizeof(struct ifinfomsg)) | |
588 | + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ | |
0b815a1a | 589 | + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */ |
339bf98f TG |
590 | + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */ |
591 | + nla_total_size(sizeof(struct rtnl_link_ifmap)) | |
592 | + nla_total_size(sizeof(struct rtnl_link_stats)) | |
593 | + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ | |
594 | + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */ | |
595 | + nla_total_size(4) /* IFLA_TXQLEN */ | |
596 | + nla_total_size(4) /* IFLA_WEIGHT */ | |
597 | + nla_total_size(4) /* IFLA_MTU */ | |
598 | + nla_total_size(4) /* IFLA_LINK */ | |
599 | + nla_total_size(4) /* IFLA_MASTER */ | |
600 | + nla_total_size(1) /* IFLA_OPERSTATE */ | |
38f7b870 PM |
601 | + nla_total_size(1) /* IFLA_LINKMODE */ |
602 | + rtnl_link_get_size(dev); /* IFLA_LINKINFO */ | |
339bf98f TG |
603 | } |
604 | ||
b60c5115 | 605 | static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev, |
575c3e2a PM |
606 | int type, u32 pid, u32 seq, u32 change, |
607 | unsigned int flags) | |
b60c5115 | 608 | { |
b0e1e646 | 609 | struct netdev_queue *txq; |
b60c5115 TG |
610 | struct ifinfomsg *ifm; |
611 | struct nlmsghdr *nlh; | |
eeda3fd6 | 612 | const struct net_device_stats *stats; |
96e74088 | 613 | struct nlattr *attr; |
1da177e4 | 614 | |
b60c5115 TG |
615 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags); |
616 | if (nlh == NULL) | |
26932566 | 617 | return -EMSGSIZE; |
1da177e4 | 618 | |
b60c5115 TG |
619 | ifm = nlmsg_data(nlh); |
620 | ifm->ifi_family = AF_UNSPEC; | |
621 | ifm->__ifi_pad = 0; | |
622 | ifm->ifi_type = dev->type; | |
623 | ifm->ifi_index = dev->ifindex; | |
624 | ifm->ifi_flags = dev_get_flags(dev); | |
625 | ifm->ifi_change = change; | |
626 | ||
627 | NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name); | |
628 | NLA_PUT_U32(skb, IFLA_TXQLEN, dev->tx_queue_len); | |
b60c5115 TG |
629 | NLA_PUT_U8(skb, IFLA_OPERSTATE, |
630 | netif_running(dev) ? dev->operstate : IF_OPER_DOWN); | |
631 | NLA_PUT_U8(skb, IFLA_LINKMODE, dev->link_mode); | |
632 | NLA_PUT_U32(skb, IFLA_MTU, dev->mtu); | |
633 | ||
634 | if (dev->ifindex != dev->iflink) | |
635 | NLA_PUT_U32(skb, IFLA_LINK, dev->iflink); | |
636 | ||
637 | if (dev->master) | |
638 | NLA_PUT_U32(skb, IFLA_MASTER, dev->master->ifindex); | |
1da177e4 | 639 | |
e8a0464c | 640 | txq = netdev_get_tx_queue(dev, 0); |
b0e1e646 DM |
641 | if (txq->qdisc_sleeping) |
642 | NLA_PUT_STRING(skb, IFLA_QDISC, txq->qdisc_sleeping->ops->id); | |
b00055aa | 643 | |
0b815a1a SH |
644 | if (dev->ifalias) |
645 | NLA_PUT_STRING(skb, IFLA_IFALIAS, dev->ifalias); | |
646 | ||
1da177e4 LT |
647 | if (1) { |
648 | struct rtnl_link_ifmap map = { | |
649 | .mem_start = dev->mem_start, | |
650 | .mem_end = dev->mem_end, | |
651 | .base_addr = dev->base_addr, | |
652 | .irq = dev->irq, | |
653 | .dma = dev->dma, | |
654 | .port = dev->if_port, | |
655 | }; | |
b60c5115 | 656 | NLA_PUT(skb, IFLA_MAP, sizeof(map), &map); |
1da177e4 LT |
657 | } |
658 | ||
659 | if (dev->addr_len) { | |
b60c5115 TG |
660 | NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr); |
661 | NLA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast); | |
1da177e4 LT |
662 | } |
663 | ||
96e74088 PE |
664 | attr = nla_reserve(skb, IFLA_STATS, |
665 | sizeof(struct rtnl_link_stats)); | |
666 | if (attr == NULL) | |
667 | goto nla_put_failure; | |
b60c5115 | 668 | |
eeda3fd6 | 669 | stats = dev_get_stats(dev); |
96e74088 | 670 | copy_rtnl_link_stats(nla_data(attr), stats); |
1da177e4 | 671 | |
38f7b870 PM |
672 | if (dev->rtnl_link_ops) { |
673 | if (rtnl_link_fill(skb, dev) < 0) | |
674 | goto nla_put_failure; | |
675 | } | |
676 | ||
b60c5115 TG |
677 | return nlmsg_end(skb, nlh); |
678 | ||
679 | nla_put_failure: | |
26932566 PM |
680 | nlmsg_cancel(skb, nlh); |
681 | return -EMSGSIZE; | |
1da177e4 LT |
682 | } |
683 | ||
b60c5115 | 684 | static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) |
1da177e4 | 685 | { |
3b1e0a65 | 686 | struct net *net = sock_net(skb->sk); |
1da177e4 LT |
687 | int idx; |
688 | int s_idx = cb->args[0]; | |
689 | struct net_device *dev; | |
690 | ||
7562f876 | 691 | idx = 0; |
881d966b | 692 | for_each_netdev(net, dev) { |
1da177e4 | 693 | if (idx < s_idx) |
7562f876 | 694 | goto cont; |
575c3e2a | 695 | if (rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK, |
b60c5115 TG |
696 | NETLINK_CB(cb->skb).pid, |
697 | cb->nlh->nlmsg_seq, 0, NLM_F_MULTI) <= 0) | |
1da177e4 | 698 | break; |
7562f876 PE |
699 | cont: |
700 | idx++; | |
1da177e4 | 701 | } |
1da177e4 LT |
702 | cb->args[0] = idx; |
703 | ||
704 | return skb->len; | |
705 | } | |
706 | ||
e7199288 | 707 | const struct nla_policy ifla_policy[IFLA_MAX+1] = { |
5176f91e | 708 | [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 }, |
38f7b870 PM |
709 | [IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, |
710 | [IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, | |
5176f91e | 711 | [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) }, |
da5e0494 | 712 | [IFLA_MTU] = { .type = NLA_U32 }, |
76e87306 | 713 | [IFLA_LINK] = { .type = NLA_U32 }, |
da5e0494 TG |
714 | [IFLA_TXQLEN] = { .type = NLA_U32 }, |
715 | [IFLA_WEIGHT] = { .type = NLA_U32 }, | |
716 | [IFLA_OPERSTATE] = { .type = NLA_U8 }, | |
717 | [IFLA_LINKMODE] = { .type = NLA_U8 }, | |
76e87306 | 718 | [IFLA_LINKINFO] = { .type = NLA_NESTED }, |
d8a5ec67 | 719 | [IFLA_NET_NS_PID] = { .type = NLA_U32 }, |
0b815a1a | 720 | [IFLA_IFALIAS] = { .type = NLA_STRING, .len = IFALIASZ-1 }, |
da5e0494 TG |
721 | }; |
722 | ||
38f7b870 PM |
723 | static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = { |
724 | [IFLA_INFO_KIND] = { .type = NLA_STRING }, | |
725 | [IFLA_INFO_DATA] = { .type = NLA_NESTED }, | |
726 | }; | |
727 | ||
1840bb13 TG |
728 | static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[]) |
729 | { | |
730 | if (dev) { | |
731 | if (tb[IFLA_ADDRESS] && | |
732 | nla_len(tb[IFLA_ADDRESS]) < dev->addr_len) | |
733 | return -EINVAL; | |
734 | ||
735 | if (tb[IFLA_BROADCAST] && | |
736 | nla_len(tb[IFLA_BROADCAST]) < dev->addr_len) | |
737 | return -EINVAL; | |
738 | } | |
739 | ||
740 | return 0; | |
741 | } | |
742 | ||
0157f60c | 743 | static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm, |
38f7b870 | 744 | struct nlattr **tb, char *ifname, int modified) |
1da177e4 | 745 | { |
d314774c | 746 | const struct net_device_ops *ops = dev->netdev_ops; |
38f7b870 | 747 | int send_addr_notify = 0; |
0157f60c | 748 | int err; |
1da177e4 | 749 | |
d8a5ec67 EB |
750 | if (tb[IFLA_NET_NS_PID]) { |
751 | struct net *net; | |
752 | net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID])); | |
753 | if (IS_ERR(net)) { | |
754 | err = PTR_ERR(net); | |
755 | goto errout; | |
756 | } | |
757 | err = dev_change_net_namespace(dev, net, ifname); | |
758 | put_net(net); | |
759 | if (err) | |
760 | goto errout; | |
761 | modified = 1; | |
762 | } | |
763 | ||
da5e0494 | 764 | if (tb[IFLA_MAP]) { |
1da177e4 LT |
765 | struct rtnl_link_ifmap *u_map; |
766 | struct ifmap k_map; | |
767 | ||
d314774c | 768 | if (!ops->ndo_set_config) { |
1da177e4 | 769 | err = -EOPNOTSUPP; |
0157f60c | 770 | goto errout; |
1da177e4 LT |
771 | } |
772 | ||
773 | if (!netif_device_present(dev)) { | |
774 | err = -ENODEV; | |
0157f60c | 775 | goto errout; |
1da177e4 | 776 | } |
1da177e4 | 777 | |
da5e0494 | 778 | u_map = nla_data(tb[IFLA_MAP]); |
1da177e4 LT |
779 | k_map.mem_start = (unsigned long) u_map->mem_start; |
780 | k_map.mem_end = (unsigned long) u_map->mem_end; | |
781 | k_map.base_addr = (unsigned short) u_map->base_addr; | |
782 | k_map.irq = (unsigned char) u_map->irq; | |
783 | k_map.dma = (unsigned char) u_map->dma; | |
784 | k_map.port = (unsigned char) u_map->port; | |
785 | ||
d314774c | 786 | err = ops->ndo_set_config(dev, &k_map); |
da5e0494 | 787 | if (err < 0) |
0157f60c | 788 | goto errout; |
1da177e4 | 789 | |
da5e0494 | 790 | modified = 1; |
1da177e4 LT |
791 | } |
792 | ||
da5e0494 | 793 | if (tb[IFLA_ADDRESS]) { |
70f8e78e DM |
794 | struct sockaddr *sa; |
795 | int len; | |
796 | ||
d314774c | 797 | if (!ops->ndo_set_mac_address) { |
1da177e4 | 798 | err = -EOPNOTSUPP; |
0157f60c | 799 | goto errout; |
1da177e4 | 800 | } |
da5e0494 | 801 | |
1da177e4 LT |
802 | if (!netif_device_present(dev)) { |
803 | err = -ENODEV; | |
0157f60c | 804 | goto errout; |
1da177e4 | 805 | } |
1da177e4 | 806 | |
70f8e78e DM |
807 | len = sizeof(sa_family_t) + dev->addr_len; |
808 | sa = kmalloc(len, GFP_KERNEL); | |
809 | if (!sa) { | |
810 | err = -ENOMEM; | |
0157f60c | 811 | goto errout; |
70f8e78e DM |
812 | } |
813 | sa->sa_family = dev->type; | |
da5e0494 | 814 | memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]), |
70f8e78e | 815 | dev->addr_len); |
d314774c | 816 | err = ops->ndo_set_mac_address(dev, sa); |
70f8e78e | 817 | kfree(sa); |
1da177e4 | 818 | if (err) |
0157f60c | 819 | goto errout; |
1da177e4 | 820 | send_addr_notify = 1; |
da5e0494 | 821 | modified = 1; |
1da177e4 LT |
822 | } |
823 | ||
da5e0494 TG |
824 | if (tb[IFLA_MTU]) { |
825 | err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU])); | |
826 | if (err < 0) | |
0157f60c | 827 | goto errout; |
da5e0494 | 828 | modified = 1; |
1da177e4 LT |
829 | } |
830 | ||
da5e0494 TG |
831 | /* |
832 | * Interface selected by interface index but interface | |
833 | * name provided implies that a name change has been | |
834 | * requested. | |
835 | */ | |
51055be8 | 836 | if (ifm->ifi_index > 0 && ifname[0]) { |
da5e0494 TG |
837 | err = dev_change_name(dev, ifname); |
838 | if (err < 0) | |
0157f60c | 839 | goto errout; |
da5e0494 | 840 | modified = 1; |
1da177e4 LT |
841 | } |
842 | ||
0b815a1a SH |
843 | if (tb[IFLA_IFALIAS]) { |
844 | err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]), | |
845 | nla_len(tb[IFLA_IFALIAS])); | |
846 | if (err < 0) | |
847 | goto errout; | |
848 | modified = 1; | |
849 | } | |
850 | ||
da5e0494 TG |
851 | if (tb[IFLA_BROADCAST]) { |
852 | nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len); | |
853 | send_addr_notify = 1; | |
1da177e4 LT |
854 | } |
855 | ||
83b496e9 PM |
856 | if (ifm->ifi_flags || ifm->ifi_change) { |
857 | unsigned int flags = ifm->ifi_flags; | |
858 | ||
859 | /* bugwards compatibility: ifi_change == 0 is treated as ~0 */ | |
860 | if (ifm->ifi_change) | |
861 | flags = (flags & ifm->ifi_change) | | |
862 | (dev->flags & ~ifm->ifi_change); | |
5f9021cf JB |
863 | err = dev_change_flags(dev, flags); |
864 | if (err < 0) | |
865 | goto errout; | |
83b496e9 | 866 | } |
1da177e4 | 867 | |
93b2d4a2 DM |
868 | if (tb[IFLA_TXQLEN]) |
869 | dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]); | |
b00055aa | 870 | |
da5e0494 | 871 | if (tb[IFLA_OPERSTATE]) |
93b2d4a2 | 872 | set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); |
b00055aa | 873 | |
da5e0494 | 874 | if (tb[IFLA_LINKMODE]) { |
93b2d4a2 DM |
875 | write_lock_bh(&dev_base_lock); |
876 | dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]); | |
877 | write_unlock_bh(&dev_base_lock); | |
b00055aa SR |
878 | } |
879 | ||
1da177e4 LT |
880 | err = 0; |
881 | ||
0157f60c | 882 | errout: |
da5e0494 TG |
883 | if (err < 0 && modified && net_ratelimit()) |
884 | printk(KERN_WARNING "A link change request failed with " | |
885 | "some changes comitted already. Interface %s may " | |
886 | "have been left with an inconsistent configuration, " | |
887 | "please check.\n", dev->name); | |
888 | ||
1da177e4 LT |
889 | if (send_addr_notify) |
890 | call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); | |
0157f60c PM |
891 | return err; |
892 | } | |
1da177e4 | 893 | |
0157f60c PM |
894 | static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) |
895 | { | |
3b1e0a65 | 896 | struct net *net = sock_net(skb->sk); |
0157f60c PM |
897 | struct ifinfomsg *ifm; |
898 | struct net_device *dev; | |
899 | int err; | |
900 | struct nlattr *tb[IFLA_MAX+1]; | |
901 | char ifname[IFNAMSIZ]; | |
902 | ||
903 | err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); | |
904 | if (err < 0) | |
905 | goto errout; | |
906 | ||
907 | if (tb[IFLA_IFNAME]) | |
908 | nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); | |
909 | else | |
910 | ifname[0] = '\0'; | |
911 | ||
912 | err = -EINVAL; | |
913 | ifm = nlmsg_data(nlh); | |
914 | if (ifm->ifi_index > 0) | |
881d966b | 915 | dev = dev_get_by_index(net, ifm->ifi_index); |
0157f60c | 916 | else if (tb[IFLA_IFNAME]) |
881d966b | 917 | dev = dev_get_by_name(net, ifname); |
0157f60c PM |
918 | else |
919 | goto errout; | |
920 | ||
921 | if (dev == NULL) { | |
922 | err = -ENODEV; | |
923 | goto errout; | |
924 | } | |
925 | ||
1840bb13 | 926 | if ((err = validate_linkmsg(dev, tb)) < 0) |
0157f60c PM |
927 | goto errout_dev; |
928 | ||
38f7b870 | 929 | err = do_setlink(dev, ifm, tb, ifname, 0); |
0157f60c | 930 | errout_dev: |
1da177e4 | 931 | dev_put(dev); |
da5e0494 | 932 | errout: |
1da177e4 LT |
933 | return err; |
934 | } | |
935 | ||
38f7b870 PM |
936 | static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) |
937 | { | |
3b1e0a65 | 938 | struct net *net = sock_net(skb->sk); |
38f7b870 PM |
939 | const struct rtnl_link_ops *ops; |
940 | struct net_device *dev; | |
941 | struct ifinfomsg *ifm; | |
942 | char ifname[IFNAMSIZ]; | |
943 | struct nlattr *tb[IFLA_MAX+1]; | |
944 | int err; | |
945 | ||
946 | err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); | |
947 | if (err < 0) | |
948 | return err; | |
949 | ||
950 | if (tb[IFLA_IFNAME]) | |
951 | nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); | |
952 | ||
953 | ifm = nlmsg_data(nlh); | |
954 | if (ifm->ifi_index > 0) | |
881d966b | 955 | dev = __dev_get_by_index(net, ifm->ifi_index); |
38f7b870 | 956 | else if (tb[IFLA_IFNAME]) |
881d966b | 957 | dev = __dev_get_by_name(net, ifname); |
38f7b870 PM |
958 | else |
959 | return -EINVAL; | |
960 | ||
961 | if (!dev) | |
962 | return -ENODEV; | |
963 | ||
964 | ops = dev->rtnl_link_ops; | |
965 | if (!ops) | |
966 | return -EOPNOTSUPP; | |
967 | ||
968 | ops->dellink(dev); | |
969 | return 0; | |
970 | } | |
971 | ||
881d966b | 972 | struct net_device *rtnl_create_link(struct net *net, char *ifname, |
e7199288 PE |
973 | const struct rtnl_link_ops *ops, struct nlattr *tb[]) |
974 | { | |
975 | int err; | |
976 | struct net_device *dev; | |
2e59af3d ED |
977 | unsigned int num_queues = 1; |
978 | unsigned int real_num_queues = 1; | |
e7199288 | 979 | |
2e59af3d ED |
980 | if (ops->get_tx_queues) { |
981 | err = ops->get_tx_queues(net, tb, &num_queues, &real_num_queues); | |
982 | if (err) | |
983 | goto err; | |
984 | } | |
e7199288 | 985 | err = -ENOMEM; |
2e59af3d | 986 | dev = alloc_netdev_mq(ops->priv_size, ifname, ops->setup, num_queues); |
e7199288 PE |
987 | if (!dev) |
988 | goto err; | |
989 | ||
2e59af3d | 990 | dev->real_num_tx_queues = real_num_queues; |
e7199288 PE |
991 | if (strchr(dev->name, '%')) { |
992 | err = dev_alloc_name(dev, dev->name); | |
993 | if (err < 0) | |
994 | goto err_free; | |
995 | } | |
996 | ||
c346dca1 | 997 | dev_net_set(dev, net); |
e7199288 PE |
998 | dev->rtnl_link_ops = ops; |
999 | ||
1000 | if (tb[IFLA_MTU]) | |
1001 | dev->mtu = nla_get_u32(tb[IFLA_MTU]); | |
1002 | if (tb[IFLA_ADDRESS]) | |
1003 | memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]), | |
1004 | nla_len(tb[IFLA_ADDRESS])); | |
1005 | if (tb[IFLA_BROADCAST]) | |
1006 | memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]), | |
1007 | nla_len(tb[IFLA_BROADCAST])); | |
1008 | if (tb[IFLA_TXQLEN]) | |
1009 | dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]); | |
1010 | if (tb[IFLA_OPERSTATE]) | |
93b2d4a2 | 1011 | set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); |
e7199288 PE |
1012 | if (tb[IFLA_LINKMODE]) |
1013 | dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]); | |
1014 | ||
1015 | return dev; | |
1016 | ||
1017 | err_free: | |
1018 | free_netdev(dev); | |
1019 | err: | |
1020 | return ERR_PTR(err); | |
1021 | } | |
1022 | ||
38f7b870 PM |
1023 | static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) |
1024 | { | |
3b1e0a65 | 1025 | struct net *net = sock_net(skb->sk); |
38f7b870 PM |
1026 | const struct rtnl_link_ops *ops; |
1027 | struct net_device *dev; | |
1028 | struct ifinfomsg *ifm; | |
1029 | char kind[MODULE_NAME_LEN]; | |
1030 | char ifname[IFNAMSIZ]; | |
1031 | struct nlattr *tb[IFLA_MAX+1]; | |
1032 | struct nlattr *linkinfo[IFLA_INFO_MAX+1]; | |
1033 | int err; | |
1034 | ||
95a5afca | 1035 | #ifdef CONFIG_MODULES |
38f7b870 | 1036 | replay: |
8072f085 | 1037 | #endif |
38f7b870 PM |
1038 | err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); |
1039 | if (err < 0) | |
1040 | return err; | |
1041 | ||
1042 | if (tb[IFLA_IFNAME]) | |
1043 | nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); | |
1044 | else | |
1045 | ifname[0] = '\0'; | |
1046 | ||
1047 | ifm = nlmsg_data(nlh); | |
1048 | if (ifm->ifi_index > 0) | |
881d966b | 1049 | dev = __dev_get_by_index(net, ifm->ifi_index); |
38f7b870 | 1050 | else if (ifname[0]) |
881d966b | 1051 | dev = __dev_get_by_name(net, ifname); |
38f7b870 PM |
1052 | else |
1053 | dev = NULL; | |
1054 | ||
1840bb13 TG |
1055 | if ((err = validate_linkmsg(dev, tb)) < 0) |
1056 | return err; | |
1057 | ||
38f7b870 PM |
1058 | if (tb[IFLA_LINKINFO]) { |
1059 | err = nla_parse_nested(linkinfo, IFLA_INFO_MAX, | |
1060 | tb[IFLA_LINKINFO], ifla_info_policy); | |
1061 | if (err < 0) | |
1062 | return err; | |
1063 | } else | |
1064 | memset(linkinfo, 0, sizeof(linkinfo)); | |
1065 | ||
1066 | if (linkinfo[IFLA_INFO_KIND]) { | |
1067 | nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind)); | |
1068 | ops = rtnl_link_ops_get(kind); | |
1069 | } else { | |
1070 | kind[0] = '\0'; | |
1071 | ops = NULL; | |
1072 | } | |
1073 | ||
1074 | if (1) { | |
1075 | struct nlattr *attr[ops ? ops->maxtype + 1 : 0], **data = NULL; | |
1076 | ||
1077 | if (ops) { | |
1078 | if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) { | |
1079 | err = nla_parse_nested(attr, ops->maxtype, | |
1080 | linkinfo[IFLA_INFO_DATA], | |
1081 | ops->policy); | |
1082 | if (err < 0) | |
1083 | return err; | |
1084 | data = attr; | |
1085 | } | |
1086 | if (ops->validate) { | |
1087 | err = ops->validate(tb, data); | |
1088 | if (err < 0) | |
1089 | return err; | |
1090 | } | |
1091 | } | |
1092 | ||
1093 | if (dev) { | |
1094 | int modified = 0; | |
1095 | ||
1096 | if (nlh->nlmsg_flags & NLM_F_EXCL) | |
1097 | return -EEXIST; | |
1098 | if (nlh->nlmsg_flags & NLM_F_REPLACE) | |
1099 | return -EOPNOTSUPP; | |
1100 | ||
1101 | if (linkinfo[IFLA_INFO_DATA]) { | |
1102 | if (!ops || ops != dev->rtnl_link_ops || | |
1103 | !ops->changelink) | |
1104 | return -EOPNOTSUPP; | |
1105 | ||
1106 | err = ops->changelink(dev, tb, data); | |
1107 | if (err < 0) | |
1108 | return err; | |
1109 | modified = 1; | |
1110 | } | |
1111 | ||
1112 | return do_setlink(dev, ifm, tb, ifname, modified); | |
1113 | } | |
1114 | ||
1115 | if (!(nlh->nlmsg_flags & NLM_F_CREATE)) | |
1116 | return -ENODEV; | |
1117 | ||
1118 | if (ifm->ifi_index || ifm->ifi_flags || ifm->ifi_change) | |
1119 | return -EOPNOTSUPP; | |
0e06877c | 1120 | if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO]) |
38f7b870 PM |
1121 | return -EOPNOTSUPP; |
1122 | ||
1123 | if (!ops) { | |
95a5afca | 1124 | #ifdef CONFIG_MODULES |
38f7b870 PM |
1125 | if (kind[0]) { |
1126 | __rtnl_unlock(); | |
1127 | request_module("rtnl-link-%s", kind); | |
1128 | rtnl_lock(); | |
1129 | ops = rtnl_link_ops_get(kind); | |
1130 | if (ops) | |
1131 | goto replay; | |
1132 | } | |
1133 | #endif | |
1134 | return -EOPNOTSUPP; | |
1135 | } | |
1136 | ||
1137 | if (!ifname[0]) | |
1138 | snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind); | |
e7199288 | 1139 | |
881d966b | 1140 | dev = rtnl_create_link(net, ifname, ops, tb); |
e7199288 PE |
1141 | |
1142 | if (IS_ERR(dev)) | |
1143 | err = PTR_ERR(dev); | |
1144 | else if (ops->newlink) | |
2d85cba2 PM |
1145 | err = ops->newlink(dev, tb, data); |
1146 | else | |
1147 | err = register_netdevice(dev); | |
e7199288 PE |
1148 | |
1149 | if (err < 0 && !IS_ERR(dev)) | |
38f7b870 PM |
1150 | free_netdev(dev); |
1151 | return err; | |
1152 | } | |
1153 | } | |
1154 | ||
b60c5115 | 1155 | static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
711e2c33 | 1156 | { |
3b1e0a65 | 1157 | struct net *net = sock_net(skb->sk); |
b60c5115 TG |
1158 | struct ifinfomsg *ifm; |
1159 | struct nlattr *tb[IFLA_MAX+1]; | |
1160 | struct net_device *dev = NULL; | |
1161 | struct sk_buff *nskb; | |
339bf98f | 1162 | int err; |
711e2c33 | 1163 | |
b60c5115 TG |
1164 | err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); |
1165 | if (err < 0) | |
9918f230 | 1166 | return err; |
b60c5115 TG |
1167 | |
1168 | ifm = nlmsg_data(nlh); | |
51055be8 | 1169 | if (ifm->ifi_index > 0) { |
881d966b | 1170 | dev = dev_get_by_index(net, ifm->ifi_index); |
b60c5115 TG |
1171 | if (dev == NULL) |
1172 | return -ENODEV; | |
1173 | } else | |
711e2c33 | 1174 | return -EINVAL; |
711e2c33 | 1175 | |
38f7b870 | 1176 | nskb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL); |
b60c5115 TG |
1177 | if (nskb == NULL) { |
1178 | err = -ENOBUFS; | |
1179 | goto errout; | |
1180 | } | |
1181 | ||
575c3e2a PM |
1182 | err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).pid, |
1183 | nlh->nlmsg_seq, 0, 0); | |
26932566 PM |
1184 | if (err < 0) { |
1185 | /* -EMSGSIZE implies BUG in if_nlmsg_size */ | |
1186 | WARN_ON(err == -EMSGSIZE); | |
1187 | kfree_skb(nskb); | |
1188 | goto errout; | |
1189 | } | |
97c53cac | 1190 | err = rtnl_unicast(nskb, net, NETLINK_CB(skb).pid); |
b60c5115 | 1191 | errout: |
711e2c33 | 1192 | dev_put(dev); |
711e2c33 | 1193 | |
b60c5115 | 1194 | return err; |
711e2c33 | 1195 | } |
711e2c33 | 1196 | |
42bad1da | 1197 | static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb) |
1da177e4 LT |
1198 | { |
1199 | int idx; | |
1200 | int s_idx = cb->family; | |
1201 | ||
1202 | if (s_idx == 0) | |
1203 | s_idx = 1; | |
1204 | for (idx=1; idx<NPROTO; idx++) { | |
1205 | int type = cb->nlh->nlmsg_type-RTM_BASE; | |
1206 | if (idx < s_idx || idx == PF_PACKET) | |
1207 | continue; | |
e2849863 TG |
1208 | if (rtnl_msg_handlers[idx] == NULL || |
1209 | rtnl_msg_handlers[idx][type].dumpit == NULL) | |
1da177e4 LT |
1210 | continue; |
1211 | if (idx > s_idx) | |
1212 | memset(&cb->args[0], 0, sizeof(cb->args)); | |
e2849863 | 1213 | if (rtnl_msg_handlers[idx][type].dumpit(skb, cb)) |
1da177e4 LT |
1214 | break; |
1215 | } | |
1216 | cb->family = idx; | |
1217 | ||
1218 | return skb->len; | |
1219 | } | |
1220 | ||
1221 | void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change) | |
1222 | { | |
c346dca1 | 1223 | struct net *net = dev_net(dev); |
1da177e4 | 1224 | struct sk_buff *skb; |
0ec6d3f4 | 1225 | int err = -ENOBUFS; |
1da177e4 | 1226 | |
38f7b870 | 1227 | skb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL); |
0ec6d3f4 TG |
1228 | if (skb == NULL) |
1229 | goto errout; | |
1da177e4 | 1230 | |
575c3e2a | 1231 | err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0); |
26932566 PM |
1232 | if (err < 0) { |
1233 | /* -EMSGSIZE implies BUG in if_nlmsg_size() */ | |
1234 | WARN_ON(err == -EMSGSIZE); | |
1235 | kfree_skb(skb); | |
1236 | goto errout; | |
1237 | } | |
1ce85fe4 PNA |
1238 | rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_KERNEL); |
1239 | return; | |
0ec6d3f4 TG |
1240 | errout: |
1241 | if (err < 0) | |
4b3da706 | 1242 | rtnl_set_sk_err(net, RTNLGRP_LINK, err); |
1da177e4 LT |
1243 | } |
1244 | ||
1da177e4 LT |
1245 | /* Protected by RTNL sempahore. */ |
1246 | static struct rtattr **rta_buf; | |
1247 | static int rtattr_max; | |
1248 | ||
1249 | /* Process one rtnetlink message. */ | |
1250 | ||
1d00a4eb | 1251 | static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) |
1da177e4 | 1252 | { |
3b1e0a65 | 1253 | struct net *net = sock_net(skb->sk); |
e2849863 | 1254 | rtnl_doit_func doit; |
1da177e4 LT |
1255 | int sz_idx, kind; |
1256 | int min_len; | |
1257 | int family; | |
1258 | int type; | |
1c2d670f | 1259 | int err; |
1da177e4 | 1260 | |
1da177e4 | 1261 | type = nlh->nlmsg_type; |
1da177e4 | 1262 | if (type > RTM_MAX) |
038890fe | 1263 | return -EOPNOTSUPP; |
1da177e4 LT |
1264 | |
1265 | type -= RTM_BASE; | |
1266 | ||
1267 | /* All the messages must have at least 1 byte length */ | |
1268 | if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg))) | |
1269 | return 0; | |
1270 | ||
1271 | family = ((struct rtgenmsg*)NLMSG_DATA(nlh))->rtgen_family; | |
1d00a4eb TG |
1272 | if (family >= NPROTO) |
1273 | return -EAFNOSUPPORT; | |
1da177e4 | 1274 | |
1da177e4 LT |
1275 | sz_idx = type>>2; |
1276 | kind = type&3; | |
1277 | ||
1d00a4eb TG |
1278 | if (kind != 2 && security_netlink_recv(skb, CAP_NET_ADMIN)) |
1279 | return -EPERM; | |
1da177e4 LT |
1280 | |
1281 | if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) { | |
97c53cac | 1282 | struct sock *rtnl; |
e2849863 | 1283 | rtnl_dumpit_func dumpit; |
1da177e4 | 1284 | |
e2849863 TG |
1285 | dumpit = rtnl_get_dumpit(family, type); |
1286 | if (dumpit == NULL) | |
038890fe | 1287 | return -EOPNOTSUPP; |
9ac4a169 | 1288 | |
1c2d670f | 1289 | __rtnl_unlock(); |
97c53cac | 1290 | rtnl = net->rtnl; |
1c2d670f PM |
1291 | err = netlink_dump_start(rtnl, skb, nlh, dumpit, NULL); |
1292 | rtnl_lock(); | |
1293 | return err; | |
1da177e4 LT |
1294 | } |
1295 | ||
1296 | memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *))); | |
1297 | ||
1298 | min_len = rtm_min[sz_idx]; | |
1299 | if (nlh->nlmsg_len < min_len) | |
1d00a4eb | 1300 | return -EINVAL; |
1da177e4 LT |
1301 | |
1302 | if (nlh->nlmsg_len > min_len) { | |
1303 | int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len); | |
1304 | struct rtattr *attr = (void*)nlh + NLMSG_ALIGN(min_len); | |
1305 | ||
1306 | while (RTA_OK(attr, attrlen)) { | |
1307 | unsigned flavor = attr->rta_type; | |
1308 | if (flavor) { | |
1309 | if (flavor > rta_max[sz_idx]) | |
1d00a4eb | 1310 | return -EINVAL; |
1da177e4 LT |
1311 | rta_buf[flavor-1] = attr; |
1312 | } | |
1313 | attr = RTA_NEXT(attr, attrlen); | |
1314 | } | |
1315 | } | |
1316 | ||
e2849863 TG |
1317 | doit = rtnl_get_doit(family, type); |
1318 | if (doit == NULL) | |
038890fe | 1319 | return -EOPNOTSUPP; |
1da177e4 | 1320 | |
1d00a4eb | 1321 | return doit(skb, nlh, (void *)&rta_buf[0]); |
1da177e4 LT |
1322 | } |
1323 | ||
cd40b7d3 | 1324 | static void rtnetlink_rcv(struct sk_buff *skb) |
1da177e4 | 1325 | { |
cd40b7d3 DL |
1326 | rtnl_lock(); |
1327 | netlink_rcv_skb(skb, &rtnetlink_rcv_msg); | |
1328 | rtnl_unlock(); | |
1da177e4 LT |
1329 | } |
1330 | ||
1da177e4 LT |
1331 | static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr) |
1332 | { | |
1333 | struct net_device *dev = ptr; | |
e9dc8653 | 1334 | |
1da177e4 LT |
1335 | switch (event) { |
1336 | case NETDEV_UNREGISTER: | |
1337 | rtmsg_ifinfo(RTM_DELLINK, dev, ~0U); | |
1338 | break; | |
1339 | case NETDEV_REGISTER: | |
1340 | rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U); | |
1341 | break; | |
1342 | case NETDEV_UP: | |
1343 | case NETDEV_DOWN: | |
1344 | rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING); | |
1345 | break; | |
1346 | case NETDEV_CHANGE: | |
1347 | case NETDEV_GOING_DOWN: | |
1348 | break; | |
1349 | default: | |
1350 | rtmsg_ifinfo(RTM_NEWLINK, dev, 0); | |
1351 | break; | |
1352 | } | |
1353 | return NOTIFY_DONE; | |
1354 | } | |
1355 | ||
1356 | static struct notifier_block rtnetlink_dev_notifier = { | |
1357 | .notifier_call = rtnetlink_event, | |
1358 | }; | |
1359 | ||
97c53cac DL |
1360 | |
1361 | static int rtnetlink_net_init(struct net *net) | |
1362 | { | |
1363 | struct sock *sk; | |
1364 | sk = netlink_kernel_create(net, NETLINK_ROUTE, RTNLGRP_MAX, | |
1365 | rtnetlink_rcv, &rtnl_mutex, THIS_MODULE); | |
1366 | if (!sk) | |
1367 | return -ENOMEM; | |
97c53cac DL |
1368 | net->rtnl = sk; |
1369 | return 0; | |
1370 | } | |
1371 | ||
1372 | static void rtnetlink_net_exit(struct net *net) | |
1373 | { | |
775516bf DL |
1374 | netlink_kernel_release(net->rtnl); |
1375 | net->rtnl = NULL; | |
97c53cac DL |
1376 | } |
1377 | ||
1378 | static struct pernet_operations rtnetlink_net_ops = { | |
1379 | .init = rtnetlink_net_init, | |
1380 | .exit = rtnetlink_net_exit, | |
1381 | }; | |
1382 | ||
1da177e4 LT |
1383 | void __init rtnetlink_init(void) |
1384 | { | |
1385 | int i; | |
1386 | ||
1387 | rtattr_max = 0; | |
1388 | for (i = 0; i < ARRAY_SIZE(rta_max); i++) | |
1389 | if (rta_max[i] > rtattr_max) | |
1390 | rtattr_max = rta_max[i]; | |
1391 | rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL); | |
1392 | if (!rta_buf) | |
1393 | panic("rtnetlink_init: cannot allocate rta_buf\n"); | |
1394 | ||
97c53cac | 1395 | if (register_pernet_subsys(&rtnetlink_net_ops)) |
1da177e4 | 1396 | panic("rtnetlink_init: cannot initialize rtnetlink\n"); |
97c53cac | 1397 | |
1da177e4 LT |
1398 | netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV); |
1399 | register_netdevice_notifier(&rtnetlink_dev_notifier); | |
340d17fc TG |
1400 | |
1401 | rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink, rtnl_dump_ifinfo); | |
1402 | rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL); | |
38f7b870 PM |
1403 | rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL); |
1404 | rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL); | |
687ad8cc TG |
1405 | |
1406 | rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all); | |
1407 | rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all); | |
1da177e4 LT |
1408 | } |
1409 | ||
1410 | EXPORT_SYMBOL(__rta_fill); | |
1da177e4 | 1411 | EXPORT_SYMBOL(rtnetlink_put_metrics); |
1da177e4 | 1412 | EXPORT_SYMBOL(rtnl_lock); |
6756ae4b | 1413 | EXPORT_SYMBOL(rtnl_trylock); |
1da177e4 | 1414 | EXPORT_SYMBOL(rtnl_unlock); |
c9c1014b | 1415 | EXPORT_SYMBOL(rtnl_is_locked); |
2942e900 | 1416 | EXPORT_SYMBOL(rtnl_unicast); |
97676b6b TG |
1417 | EXPORT_SYMBOL(rtnl_notify); |
1418 | EXPORT_SYMBOL(rtnl_set_sk_err); | |
e7199288 PE |
1419 | EXPORT_SYMBOL(rtnl_create_link); |
1420 | EXPORT_SYMBOL(ifla_policy); |