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> |
d8a5ec67 | 38 | #include <linux/nsproxy.h> |
1da177e4 LT |
39 | |
40 | #include <asm/uaccess.h> | |
41 | #include <asm/system.h> | |
42 | #include <asm/string.h> | |
43 | ||
44 | #include <linux/inet.h> | |
45 | #include <linux/netdevice.h> | |
46 | #include <net/ip.h> | |
47 | #include <net/protocol.h> | |
48 | #include <net/arp.h> | |
49 | #include <net/route.h> | |
50 | #include <net/udp.h> | |
51 | #include <net/sock.h> | |
52 | #include <net/pkt_sched.h> | |
14c0b97d | 53 | #include <net/fib_rules.h> |
e2849863 | 54 | #include <net/rtnetlink.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 | { | |
6756ae4b | 76 | mutex_unlock(&rtnl_mutex); |
1da177e4 LT |
77 | netdev_run_todo(); |
78 | } | |
79 | ||
6756ae4b SH |
80 | int rtnl_trylock(void) |
81 | { | |
82 | return mutex_trylock(&rtnl_mutex); | |
83 | } | |
84 | ||
42bad1da | 85 | static struct rtnl_link *rtnl_msg_handlers[NPROTO]; |
e2849863 TG |
86 | |
87 | static inline int rtm_msgindex(int msgtype) | |
88 | { | |
89 | int msgindex = msgtype - RTM_BASE; | |
90 | ||
91 | /* | |
92 | * msgindex < 0 implies someone tried to register a netlink | |
93 | * control code. msgindex >= RTM_NR_MSGTYPES may indicate that | |
94 | * the message type has not been added to linux/rtnetlink.h | |
95 | */ | |
96 | BUG_ON(msgindex < 0 || msgindex >= RTM_NR_MSGTYPES); | |
97 | ||
98 | return msgindex; | |
99 | } | |
100 | ||
101 | static rtnl_doit_func rtnl_get_doit(int protocol, int msgindex) | |
102 | { | |
103 | struct rtnl_link *tab; | |
104 | ||
105 | tab = rtnl_msg_handlers[protocol]; | |
51057f2f | 106 | if (tab == NULL || tab[msgindex].doit == NULL) |
e2849863 TG |
107 | tab = rtnl_msg_handlers[PF_UNSPEC]; |
108 | ||
51057f2f | 109 | return tab ? tab[msgindex].doit : NULL; |
e2849863 TG |
110 | } |
111 | ||
112 | static rtnl_dumpit_func rtnl_get_dumpit(int protocol, int msgindex) | |
113 | { | |
114 | struct rtnl_link *tab; | |
115 | ||
116 | tab = rtnl_msg_handlers[protocol]; | |
51057f2f | 117 | if (tab == NULL || tab[msgindex].dumpit == NULL) |
e2849863 TG |
118 | tab = rtnl_msg_handlers[PF_UNSPEC]; |
119 | ||
51057f2f | 120 | return tab ? tab[msgindex].dumpit : NULL; |
e2849863 TG |
121 | } |
122 | ||
123 | /** | |
124 | * __rtnl_register - Register a rtnetlink message type | |
125 | * @protocol: Protocol family or PF_UNSPEC | |
126 | * @msgtype: rtnetlink message type | |
127 | * @doit: Function pointer called for each request message | |
128 | * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message | |
129 | * | |
130 | * Registers the specified function pointers (at least one of them has | |
131 | * to be non-NULL) to be called whenever a request message for the | |
132 | * specified protocol family and message type is received. | |
133 | * | |
134 | * The special protocol family PF_UNSPEC may be used to define fallback | |
135 | * function pointers for the case when no entry for the specific protocol | |
136 | * family exists. | |
137 | * | |
138 | * Returns 0 on success or a negative error code. | |
139 | */ | |
140 | int __rtnl_register(int protocol, int msgtype, | |
141 | rtnl_doit_func doit, rtnl_dumpit_func dumpit) | |
142 | { | |
143 | struct rtnl_link *tab; | |
144 | int msgindex; | |
145 | ||
146 | BUG_ON(protocol < 0 || protocol >= NPROTO); | |
147 | msgindex = rtm_msgindex(msgtype); | |
148 | ||
149 | tab = rtnl_msg_handlers[protocol]; | |
150 | if (tab == NULL) { | |
151 | tab = kcalloc(RTM_NR_MSGTYPES, sizeof(*tab), GFP_KERNEL); | |
152 | if (tab == NULL) | |
153 | return -ENOBUFS; | |
154 | ||
155 | rtnl_msg_handlers[protocol] = tab; | |
156 | } | |
157 | ||
158 | if (doit) | |
159 | tab[msgindex].doit = doit; | |
160 | ||
161 | if (dumpit) | |
162 | tab[msgindex].dumpit = dumpit; | |
163 | ||
164 | return 0; | |
165 | } | |
166 | ||
167 | EXPORT_SYMBOL_GPL(__rtnl_register); | |
168 | ||
169 | /** | |
170 | * rtnl_register - Register a rtnetlink message type | |
171 | * | |
172 | * Identical to __rtnl_register() but panics on failure. This is useful | |
173 | * as failure of this function is very unlikely, it can only happen due | |
174 | * to lack of memory when allocating the chain to store all message | |
175 | * handlers for a protocol. Meant for use in init functions where lack | |
176 | * of memory implies no sense in continueing. | |
177 | */ | |
178 | void rtnl_register(int protocol, int msgtype, | |
179 | rtnl_doit_func doit, rtnl_dumpit_func dumpit) | |
180 | { | |
181 | if (__rtnl_register(protocol, msgtype, doit, dumpit) < 0) | |
182 | panic("Unable to register rtnetlink message handler, " | |
183 | "protocol = %d, message type = %d\n", | |
184 | protocol, msgtype); | |
185 | } | |
186 | ||
187 | EXPORT_SYMBOL_GPL(rtnl_register); | |
188 | ||
189 | /** | |
190 | * rtnl_unregister - Unregister a rtnetlink message type | |
191 | * @protocol: Protocol family or PF_UNSPEC | |
192 | * @msgtype: rtnetlink message type | |
193 | * | |
194 | * Returns 0 on success or a negative error code. | |
195 | */ | |
196 | int rtnl_unregister(int protocol, int msgtype) | |
197 | { | |
198 | int msgindex; | |
199 | ||
200 | BUG_ON(protocol < 0 || protocol >= NPROTO); | |
201 | msgindex = rtm_msgindex(msgtype); | |
202 | ||
203 | if (rtnl_msg_handlers[protocol] == NULL) | |
204 | return -ENOENT; | |
205 | ||
206 | rtnl_msg_handlers[protocol][msgindex].doit = NULL; | |
207 | rtnl_msg_handlers[protocol][msgindex].dumpit = NULL; | |
208 | ||
209 | return 0; | |
210 | } | |
211 | ||
212 | EXPORT_SYMBOL_GPL(rtnl_unregister); | |
213 | ||
214 | /** | |
215 | * rtnl_unregister_all - Unregister all rtnetlink message type of a protocol | |
216 | * @protocol : Protocol family or PF_UNSPEC | |
217 | * | |
218 | * Identical to calling rtnl_unregster() for all registered message types | |
219 | * of a certain protocol family. | |
220 | */ | |
221 | void rtnl_unregister_all(int protocol) | |
222 | { | |
223 | BUG_ON(protocol < 0 || protocol >= NPROTO); | |
224 | ||
225 | kfree(rtnl_msg_handlers[protocol]); | |
226 | rtnl_msg_handlers[protocol] = NULL; | |
227 | } | |
228 | ||
229 | EXPORT_SYMBOL_GPL(rtnl_unregister_all); | |
1da177e4 | 230 | |
38f7b870 PM |
231 | static LIST_HEAD(link_ops); |
232 | ||
233 | /** | |
234 | * __rtnl_link_register - Register rtnl_link_ops with rtnetlink. | |
235 | * @ops: struct rtnl_link_ops * to register | |
236 | * | |
237 | * The caller must hold the rtnl_mutex. This function should be used | |
238 | * by drivers that create devices during module initialization. It | |
239 | * must be called before registering the devices. | |
240 | * | |
241 | * Returns 0 on success or a negative error code. | |
242 | */ | |
243 | int __rtnl_link_register(struct rtnl_link_ops *ops) | |
244 | { | |
2d85cba2 PM |
245 | if (!ops->dellink) |
246 | ops->dellink = unregister_netdevice; | |
247 | ||
38f7b870 PM |
248 | list_add_tail(&ops->list, &link_ops); |
249 | return 0; | |
250 | } | |
251 | ||
252 | EXPORT_SYMBOL_GPL(__rtnl_link_register); | |
253 | ||
254 | /** | |
255 | * rtnl_link_register - Register rtnl_link_ops with rtnetlink. | |
256 | * @ops: struct rtnl_link_ops * to register | |
257 | * | |
258 | * Returns 0 on success or a negative error code. | |
259 | */ | |
260 | int rtnl_link_register(struct rtnl_link_ops *ops) | |
261 | { | |
262 | int err; | |
263 | ||
264 | rtnl_lock(); | |
265 | err = __rtnl_link_register(ops); | |
266 | rtnl_unlock(); | |
267 | return err; | |
268 | } | |
269 | ||
270 | EXPORT_SYMBOL_GPL(rtnl_link_register); | |
271 | ||
272 | /** | |
273 | * __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink. | |
274 | * @ops: struct rtnl_link_ops * to unregister | |
275 | * | |
2d85cba2 | 276 | * The caller must hold the rtnl_mutex. |
38f7b870 PM |
277 | */ |
278 | void __rtnl_link_unregister(struct rtnl_link_ops *ops) | |
279 | { | |
2d85cba2 | 280 | struct net_device *dev, *n; |
881d966b | 281 | struct net *net; |
2d85cba2 | 282 | |
881d966b | 283 | for_each_net(net) { |
68365458 | 284 | restart: |
881d966b | 285 | for_each_netdev_safe(net, dev, n) { |
68365458 | 286 | if (dev->rtnl_link_ops == ops) { |
881d966b | 287 | ops->dellink(dev); |
68365458 PM |
288 | goto restart; |
289 | } | |
881d966b | 290 | } |
2d85cba2 | 291 | } |
38f7b870 PM |
292 | list_del(&ops->list); |
293 | } | |
294 | ||
295 | EXPORT_SYMBOL_GPL(__rtnl_link_unregister); | |
296 | ||
297 | /** | |
298 | * rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink. | |
299 | * @ops: struct rtnl_link_ops * to unregister | |
300 | */ | |
301 | void rtnl_link_unregister(struct rtnl_link_ops *ops) | |
302 | { | |
303 | rtnl_lock(); | |
304 | __rtnl_link_unregister(ops); | |
305 | rtnl_unlock(); | |
306 | } | |
307 | ||
308 | EXPORT_SYMBOL_GPL(rtnl_link_unregister); | |
309 | ||
310 | static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind) | |
311 | { | |
312 | const struct rtnl_link_ops *ops; | |
313 | ||
314 | list_for_each_entry(ops, &link_ops, list) { | |
315 | if (!strcmp(ops->kind, kind)) | |
316 | return ops; | |
317 | } | |
318 | return NULL; | |
319 | } | |
320 | ||
321 | static size_t rtnl_link_get_size(const struct net_device *dev) | |
322 | { | |
323 | const struct rtnl_link_ops *ops = dev->rtnl_link_ops; | |
324 | size_t size; | |
325 | ||
326 | if (!ops) | |
327 | return 0; | |
328 | ||
329 | size = nlmsg_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */ | |
330 | nlmsg_total_size(strlen(ops->kind) + 1); /* IFLA_INFO_KIND */ | |
331 | ||
332 | if (ops->get_size) | |
333 | /* IFLA_INFO_DATA + nested data */ | |
334 | size += nlmsg_total_size(sizeof(struct nlattr)) + | |
335 | ops->get_size(dev); | |
336 | ||
337 | if (ops->get_xstats_size) | |
338 | size += ops->get_xstats_size(dev); /* IFLA_INFO_XSTATS */ | |
339 | ||
340 | return size; | |
341 | } | |
342 | ||
343 | static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev) | |
344 | { | |
345 | const struct rtnl_link_ops *ops = dev->rtnl_link_ops; | |
346 | struct nlattr *linkinfo, *data; | |
347 | int err = -EMSGSIZE; | |
348 | ||
349 | linkinfo = nla_nest_start(skb, IFLA_LINKINFO); | |
350 | if (linkinfo == NULL) | |
351 | goto out; | |
352 | ||
353 | if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0) | |
354 | goto err_cancel_link; | |
355 | if (ops->fill_xstats) { | |
356 | err = ops->fill_xstats(skb, dev); | |
357 | if (err < 0) | |
358 | goto err_cancel_link; | |
359 | } | |
360 | if (ops->fill_info) { | |
361 | data = nla_nest_start(skb, IFLA_INFO_DATA); | |
362 | if (data == NULL) | |
363 | goto err_cancel_link; | |
364 | err = ops->fill_info(skb, dev); | |
365 | if (err < 0) | |
366 | goto err_cancel_data; | |
367 | nla_nest_end(skb, data); | |
368 | } | |
369 | ||
370 | nla_nest_end(skb, linkinfo); | |
371 | return 0; | |
372 | ||
373 | err_cancel_data: | |
374 | nla_nest_cancel(skb, data); | |
375 | err_cancel_link: | |
376 | nla_nest_cancel(skb, linkinfo); | |
377 | out: | |
378 | return err; | |
379 | } | |
380 | ||
db46edc6 | 381 | static const int rtm_min[RTM_NR_FAMILIES] = |
1da177e4 | 382 | { |
f90a0a74 TG |
383 | [RTM_FAM(RTM_NEWLINK)] = NLMSG_LENGTH(sizeof(struct ifinfomsg)), |
384 | [RTM_FAM(RTM_NEWADDR)] = NLMSG_LENGTH(sizeof(struct ifaddrmsg)), | |
385 | [RTM_FAM(RTM_NEWROUTE)] = NLMSG_LENGTH(sizeof(struct rtmsg)), | |
14c0b97d | 386 | [RTM_FAM(RTM_NEWRULE)] = NLMSG_LENGTH(sizeof(struct fib_rule_hdr)), |
f90a0a74 TG |
387 | [RTM_FAM(RTM_NEWQDISC)] = NLMSG_LENGTH(sizeof(struct tcmsg)), |
388 | [RTM_FAM(RTM_NEWTCLASS)] = NLMSG_LENGTH(sizeof(struct tcmsg)), | |
389 | [RTM_FAM(RTM_NEWTFILTER)] = NLMSG_LENGTH(sizeof(struct tcmsg)), | |
390 | [RTM_FAM(RTM_NEWACTION)] = NLMSG_LENGTH(sizeof(struct tcamsg)), | |
f90a0a74 TG |
391 | [RTM_FAM(RTM_GETMULTICAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)), |
392 | [RTM_FAM(RTM_GETANYCAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)), | |
1da177e4 LT |
393 | }; |
394 | ||
db46edc6 | 395 | static const int rta_max[RTM_NR_FAMILIES] = |
1da177e4 | 396 | { |
f90a0a74 TG |
397 | [RTM_FAM(RTM_NEWLINK)] = IFLA_MAX, |
398 | [RTM_FAM(RTM_NEWADDR)] = IFA_MAX, | |
399 | [RTM_FAM(RTM_NEWROUTE)] = RTA_MAX, | |
14c0b97d | 400 | [RTM_FAM(RTM_NEWRULE)] = FRA_MAX, |
f90a0a74 TG |
401 | [RTM_FAM(RTM_NEWQDISC)] = TCA_MAX, |
402 | [RTM_FAM(RTM_NEWTCLASS)] = TCA_MAX, | |
403 | [RTM_FAM(RTM_NEWTFILTER)] = TCA_MAX, | |
404 | [RTM_FAM(RTM_NEWACTION)] = TCAA_MAX, | |
1da177e4 LT |
405 | }; |
406 | ||
407 | void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const void *data) | |
408 | { | |
409 | struct rtattr *rta; | |
410 | int size = RTA_LENGTH(attrlen); | |
411 | ||
412 | rta = (struct rtattr*)skb_put(skb, RTA_ALIGN(size)); | |
413 | rta->rta_type = attrtype; | |
414 | rta->rta_len = size; | |
415 | memcpy(RTA_DATA(rta), data, attrlen); | |
b3563c4f | 416 | memset(RTA_DATA(rta) + attrlen, 0, RTA_ALIGN(size) - size); |
1da177e4 LT |
417 | } |
418 | ||
97c53cac | 419 | int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned group, int echo) |
1da177e4 | 420 | { |
97c53cac | 421 | struct sock *rtnl = net->rtnl; |
1da177e4 LT |
422 | int err = 0; |
423 | ||
ac6d439d | 424 | NETLINK_CB(skb).dst_group = group; |
1da177e4 LT |
425 | if (echo) |
426 | atomic_inc(&skb->users); | |
427 | netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL); | |
428 | if (echo) | |
429 | err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT); | |
430 | return err; | |
431 | } | |
432 | ||
97c53cac | 433 | int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid) |
2942e900 | 434 | { |
97c53cac DL |
435 | struct sock *rtnl = net->rtnl; |
436 | ||
2942e900 TG |
437 | return nlmsg_unicast(rtnl, skb, pid); |
438 | } | |
439 | ||
97c53cac | 440 | int rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group, |
97676b6b TG |
441 | struct nlmsghdr *nlh, gfp_t flags) |
442 | { | |
97c53cac | 443 | struct sock *rtnl = net->rtnl; |
97676b6b TG |
444 | int report = 0; |
445 | ||
446 | if (nlh) | |
447 | report = nlmsg_report(nlh); | |
448 | ||
449 | return nlmsg_notify(rtnl, skb, pid, group, report, flags); | |
450 | } | |
451 | ||
97c53cac | 452 | void rtnl_set_sk_err(struct net *net, u32 group, int error) |
97676b6b | 453 | { |
97c53cac DL |
454 | struct sock *rtnl = net->rtnl; |
455 | ||
97676b6b TG |
456 | netlink_set_err(rtnl, 0, group, error); |
457 | } | |
458 | ||
1da177e4 LT |
459 | int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics) |
460 | { | |
2d7202bf TG |
461 | struct nlattr *mx; |
462 | int i, valid = 0; | |
463 | ||
464 | mx = nla_nest_start(skb, RTA_METRICS); | |
465 | if (mx == NULL) | |
466 | return -ENOBUFS; | |
467 | ||
468 | for (i = 0; i < RTAX_MAX; i++) { | |
469 | if (metrics[i]) { | |
470 | valid++; | |
471 | NLA_PUT_U32(skb, i+1, metrics[i]); | |
472 | } | |
1da177e4 | 473 | } |
1da177e4 | 474 | |
a57d27fc DM |
475 | if (!valid) { |
476 | nla_nest_cancel(skb, mx); | |
477 | return 0; | |
478 | } | |
2d7202bf TG |
479 | |
480 | return nla_nest_end(skb, mx); | |
481 | ||
482 | nla_put_failure: | |
483 | return nla_nest_cancel(skb, mx); | |
1da177e4 LT |
484 | } |
485 | ||
e3703b3d TG |
486 | int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id, |
487 | u32 ts, u32 tsage, long expires, u32 error) | |
488 | { | |
489 | struct rta_cacheinfo ci = { | |
490 | .rta_lastuse = jiffies_to_clock_t(jiffies - dst->lastuse), | |
491 | .rta_used = dst->__use, | |
492 | .rta_clntref = atomic_read(&(dst->__refcnt)), | |
493 | .rta_error = error, | |
494 | .rta_id = id, | |
495 | .rta_ts = ts, | |
496 | .rta_tsage = tsage, | |
497 | }; | |
498 | ||
499 | if (expires) | |
500 | ci.rta_expires = jiffies_to_clock_t(expires); | |
501 | ||
502 | return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci); | |
503 | } | |
504 | ||
505 | EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo); | |
1da177e4 | 506 | |
45b50354 | 507 | static int set_operstate(struct net_device *dev, unsigned char transition, bool send_notification) |
b00055aa SR |
508 | { |
509 | unsigned char operstate = dev->operstate; | |
510 | ||
511 | switch(transition) { | |
512 | case IF_OPER_UP: | |
513 | if ((operstate == IF_OPER_DORMANT || | |
514 | operstate == IF_OPER_UNKNOWN) && | |
515 | !netif_dormant(dev)) | |
516 | operstate = IF_OPER_UP; | |
517 | break; | |
518 | ||
519 | case IF_OPER_DORMANT: | |
520 | if (operstate == IF_OPER_UP || | |
521 | operstate == IF_OPER_UNKNOWN) | |
522 | operstate = IF_OPER_DORMANT; | |
523 | break; | |
3ff50b79 | 524 | } |
b00055aa SR |
525 | |
526 | if (dev->operstate != operstate) { | |
527 | write_lock_bh(&dev_base_lock); | |
528 | dev->operstate = operstate; | |
529 | write_unlock_bh(&dev_base_lock); | |
45b50354 LAT |
530 | |
531 | if (send_notification) | |
532 | netdev_state_change(dev); | |
533 | return 1; | |
534 | } else | |
535 | return 0; | |
b00055aa SR |
536 | } |
537 | ||
b60c5115 TG |
538 | static void copy_rtnl_link_stats(struct rtnl_link_stats *a, |
539 | struct net_device_stats *b) | |
1da177e4 | 540 | { |
b60c5115 TG |
541 | a->rx_packets = b->rx_packets; |
542 | a->tx_packets = b->tx_packets; | |
543 | a->rx_bytes = b->rx_bytes; | |
544 | a->tx_bytes = b->tx_bytes; | |
545 | a->rx_errors = b->rx_errors; | |
546 | a->tx_errors = b->tx_errors; | |
547 | a->rx_dropped = b->rx_dropped; | |
548 | a->tx_dropped = b->tx_dropped; | |
549 | ||
550 | a->multicast = b->multicast; | |
551 | a->collisions = b->collisions; | |
552 | ||
553 | a->rx_length_errors = b->rx_length_errors; | |
554 | a->rx_over_errors = b->rx_over_errors; | |
555 | a->rx_crc_errors = b->rx_crc_errors; | |
556 | a->rx_frame_errors = b->rx_frame_errors; | |
557 | a->rx_fifo_errors = b->rx_fifo_errors; | |
558 | a->rx_missed_errors = b->rx_missed_errors; | |
559 | ||
560 | a->tx_aborted_errors = b->tx_aborted_errors; | |
561 | a->tx_carrier_errors = b->tx_carrier_errors; | |
562 | a->tx_fifo_errors = b->tx_fifo_errors; | |
563 | a->tx_heartbeat_errors = b->tx_heartbeat_errors; | |
564 | a->tx_window_errors = b->tx_window_errors; | |
565 | ||
566 | a->rx_compressed = b->rx_compressed; | |
567 | a->tx_compressed = b->tx_compressed; | |
568 | }; | |
1da177e4 | 569 | |
38f7b870 | 570 | static inline size_t if_nlmsg_size(const struct net_device *dev) |
339bf98f TG |
571 | { |
572 | return NLMSG_ALIGN(sizeof(struct ifinfomsg)) | |
573 | + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ | |
574 | + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */ | |
575 | + nla_total_size(sizeof(struct rtnl_link_ifmap)) | |
576 | + nla_total_size(sizeof(struct rtnl_link_stats)) | |
577 | + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ | |
578 | + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */ | |
579 | + nla_total_size(4) /* IFLA_TXQLEN */ | |
580 | + nla_total_size(4) /* IFLA_WEIGHT */ | |
581 | + nla_total_size(4) /* IFLA_MTU */ | |
582 | + nla_total_size(4) /* IFLA_LINK */ | |
583 | + nla_total_size(4) /* IFLA_MASTER */ | |
584 | + nla_total_size(1) /* IFLA_OPERSTATE */ | |
38f7b870 PM |
585 | + nla_total_size(1) /* IFLA_LINKMODE */ |
586 | + rtnl_link_get_size(dev); /* IFLA_LINKINFO */ | |
339bf98f TG |
587 | } |
588 | ||
b60c5115 | 589 | static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev, |
575c3e2a PM |
590 | int type, u32 pid, u32 seq, u32 change, |
591 | unsigned int flags) | |
b60c5115 TG |
592 | { |
593 | struct ifinfomsg *ifm; | |
594 | struct nlmsghdr *nlh; | |
1da177e4 | 595 | |
b60c5115 TG |
596 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags); |
597 | if (nlh == NULL) | |
26932566 | 598 | return -EMSGSIZE; |
1da177e4 | 599 | |
b60c5115 TG |
600 | ifm = nlmsg_data(nlh); |
601 | ifm->ifi_family = AF_UNSPEC; | |
602 | ifm->__ifi_pad = 0; | |
603 | ifm->ifi_type = dev->type; | |
604 | ifm->ifi_index = dev->ifindex; | |
605 | ifm->ifi_flags = dev_get_flags(dev); | |
606 | ifm->ifi_change = change; | |
607 | ||
608 | NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name); | |
609 | NLA_PUT_U32(skb, IFLA_TXQLEN, dev->tx_queue_len); | |
b60c5115 TG |
610 | NLA_PUT_U8(skb, IFLA_OPERSTATE, |
611 | netif_running(dev) ? dev->operstate : IF_OPER_DOWN); | |
612 | NLA_PUT_U8(skb, IFLA_LINKMODE, dev->link_mode); | |
613 | NLA_PUT_U32(skb, IFLA_MTU, dev->mtu); | |
614 | ||
615 | if (dev->ifindex != dev->iflink) | |
616 | NLA_PUT_U32(skb, IFLA_LINK, dev->iflink); | |
617 | ||
618 | if (dev->master) | |
619 | NLA_PUT_U32(skb, IFLA_MASTER, dev->master->ifindex); | |
1da177e4 | 620 | |
b60c5115 TG |
621 | if (dev->qdisc_sleeping) |
622 | NLA_PUT_STRING(skb, IFLA_QDISC, dev->qdisc_sleeping->ops->id); | |
b00055aa | 623 | |
1da177e4 LT |
624 | if (1) { |
625 | struct rtnl_link_ifmap map = { | |
626 | .mem_start = dev->mem_start, | |
627 | .mem_end = dev->mem_end, | |
628 | .base_addr = dev->base_addr, | |
629 | .irq = dev->irq, | |
630 | .dma = dev->dma, | |
631 | .port = dev->if_port, | |
632 | }; | |
b60c5115 | 633 | NLA_PUT(skb, IFLA_MAP, sizeof(map), &map); |
1da177e4 LT |
634 | } |
635 | ||
636 | if (dev->addr_len) { | |
b60c5115 TG |
637 | NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr); |
638 | NLA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast); | |
1da177e4 LT |
639 | } |
640 | ||
641 | if (dev->get_stats) { | |
b60c5115 | 642 | struct net_device_stats *stats = dev->get_stats(dev); |
1da177e4 | 643 | if (stats) { |
b60c5115 TG |
644 | struct nlattr *attr; |
645 | ||
646 | attr = nla_reserve(skb, IFLA_STATS, | |
647 | sizeof(struct rtnl_link_stats)); | |
648 | if (attr == NULL) | |
649 | goto nla_put_failure; | |
650 | ||
651 | copy_rtnl_link_stats(nla_data(attr), stats); | |
1da177e4 LT |
652 | } |
653 | } | |
1da177e4 | 654 | |
38f7b870 PM |
655 | if (dev->rtnl_link_ops) { |
656 | if (rtnl_link_fill(skb, dev) < 0) | |
657 | goto nla_put_failure; | |
658 | } | |
659 | ||
b60c5115 TG |
660 | return nlmsg_end(skb, nlh); |
661 | ||
662 | nla_put_failure: | |
26932566 PM |
663 | nlmsg_cancel(skb, nlh); |
664 | return -EMSGSIZE; | |
1da177e4 LT |
665 | } |
666 | ||
b60c5115 | 667 | static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) |
1da177e4 | 668 | { |
881d966b | 669 | struct net *net = skb->sk->sk_net; |
1da177e4 LT |
670 | int idx; |
671 | int s_idx = cb->args[0]; | |
672 | struct net_device *dev; | |
673 | ||
7562f876 | 674 | idx = 0; |
881d966b | 675 | for_each_netdev(net, dev) { |
1da177e4 | 676 | if (idx < s_idx) |
7562f876 | 677 | goto cont; |
575c3e2a | 678 | if (rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK, |
b60c5115 TG |
679 | NETLINK_CB(cb->skb).pid, |
680 | cb->nlh->nlmsg_seq, 0, NLM_F_MULTI) <= 0) | |
1da177e4 | 681 | break; |
7562f876 PE |
682 | cont: |
683 | idx++; | |
1da177e4 | 684 | } |
1da177e4 LT |
685 | cb->args[0] = idx; |
686 | ||
687 | return skb->len; | |
688 | } | |
689 | ||
e7199288 | 690 | const struct nla_policy ifla_policy[IFLA_MAX+1] = { |
5176f91e | 691 | [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 }, |
38f7b870 PM |
692 | [IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, |
693 | [IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, | |
5176f91e | 694 | [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) }, |
da5e0494 TG |
695 | [IFLA_MTU] = { .type = NLA_U32 }, |
696 | [IFLA_TXQLEN] = { .type = NLA_U32 }, | |
697 | [IFLA_WEIGHT] = { .type = NLA_U32 }, | |
698 | [IFLA_OPERSTATE] = { .type = NLA_U8 }, | |
699 | [IFLA_LINKMODE] = { .type = NLA_U8 }, | |
d8a5ec67 | 700 | [IFLA_NET_NS_PID] = { .type = NLA_U32 }, |
da5e0494 TG |
701 | }; |
702 | ||
38f7b870 PM |
703 | static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = { |
704 | [IFLA_INFO_KIND] = { .type = NLA_STRING }, | |
705 | [IFLA_INFO_DATA] = { .type = NLA_NESTED }, | |
706 | }; | |
707 | ||
d8a5ec67 EB |
708 | static struct net *get_net_ns_by_pid(pid_t pid) |
709 | { | |
710 | struct task_struct *tsk; | |
711 | struct net *net; | |
712 | ||
713 | /* Lookup the network namespace */ | |
714 | net = ERR_PTR(-ESRCH); | |
715 | rcu_read_lock(); | |
ceaa79c4 | 716 | tsk = find_task_by_vpid(pid); |
d8a5ec67 | 717 | if (tsk) { |
cf7b708c PE |
718 | struct nsproxy *nsproxy; |
719 | nsproxy = task_nsproxy(tsk); | |
720 | if (nsproxy) | |
721 | net = get_net(nsproxy->net_ns); | |
d8a5ec67 EB |
722 | } |
723 | rcu_read_unlock(); | |
724 | return net; | |
725 | } | |
726 | ||
0157f60c | 727 | static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm, |
38f7b870 | 728 | struct nlattr **tb, char *ifname, int modified) |
1da177e4 | 729 | { |
38f7b870 | 730 | int send_addr_notify = 0; |
0157f60c | 731 | int err; |
1da177e4 | 732 | |
d8a5ec67 EB |
733 | if (tb[IFLA_NET_NS_PID]) { |
734 | struct net *net; | |
735 | net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID])); | |
736 | if (IS_ERR(net)) { | |
737 | err = PTR_ERR(net); | |
738 | goto errout; | |
739 | } | |
740 | err = dev_change_net_namespace(dev, net, ifname); | |
741 | put_net(net); | |
742 | if (err) | |
743 | goto errout; | |
744 | modified = 1; | |
745 | } | |
746 | ||
da5e0494 | 747 | if (tb[IFLA_MAP]) { |
1da177e4 LT |
748 | struct rtnl_link_ifmap *u_map; |
749 | struct ifmap k_map; | |
750 | ||
751 | if (!dev->set_config) { | |
752 | err = -EOPNOTSUPP; | |
0157f60c | 753 | goto errout; |
1da177e4 LT |
754 | } |
755 | ||
756 | if (!netif_device_present(dev)) { | |
757 | err = -ENODEV; | |
0157f60c | 758 | goto errout; |
1da177e4 | 759 | } |
1da177e4 | 760 | |
da5e0494 | 761 | u_map = nla_data(tb[IFLA_MAP]); |
1da177e4 LT |
762 | k_map.mem_start = (unsigned long) u_map->mem_start; |
763 | k_map.mem_end = (unsigned long) u_map->mem_end; | |
764 | k_map.base_addr = (unsigned short) u_map->base_addr; | |
765 | k_map.irq = (unsigned char) u_map->irq; | |
766 | k_map.dma = (unsigned char) u_map->dma; | |
767 | k_map.port = (unsigned char) u_map->port; | |
768 | ||
769 | err = dev->set_config(dev, &k_map); | |
da5e0494 | 770 | if (err < 0) |
0157f60c | 771 | goto errout; |
1da177e4 | 772 | |
da5e0494 | 773 | modified = 1; |
1da177e4 LT |
774 | } |
775 | ||
da5e0494 | 776 | if (tb[IFLA_ADDRESS]) { |
70f8e78e DM |
777 | struct sockaddr *sa; |
778 | int len; | |
779 | ||
1da177e4 LT |
780 | if (!dev->set_mac_address) { |
781 | err = -EOPNOTSUPP; | |
0157f60c | 782 | goto errout; |
1da177e4 | 783 | } |
da5e0494 | 784 | |
1da177e4 LT |
785 | if (!netif_device_present(dev)) { |
786 | err = -ENODEV; | |
0157f60c | 787 | goto errout; |
1da177e4 | 788 | } |
1da177e4 | 789 | |
70f8e78e DM |
790 | len = sizeof(sa_family_t) + dev->addr_len; |
791 | sa = kmalloc(len, GFP_KERNEL); | |
792 | if (!sa) { | |
793 | err = -ENOMEM; | |
0157f60c | 794 | goto errout; |
70f8e78e DM |
795 | } |
796 | sa->sa_family = dev->type; | |
da5e0494 | 797 | memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]), |
70f8e78e DM |
798 | dev->addr_len); |
799 | err = dev->set_mac_address(dev, sa); | |
800 | kfree(sa); | |
1da177e4 | 801 | if (err) |
0157f60c | 802 | goto errout; |
1da177e4 | 803 | send_addr_notify = 1; |
da5e0494 | 804 | modified = 1; |
1da177e4 LT |
805 | } |
806 | ||
da5e0494 TG |
807 | if (tb[IFLA_MTU]) { |
808 | err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU])); | |
809 | if (err < 0) | |
0157f60c | 810 | goto errout; |
da5e0494 | 811 | modified = 1; |
1da177e4 LT |
812 | } |
813 | ||
da5e0494 TG |
814 | /* |
815 | * Interface selected by interface index but interface | |
816 | * name provided implies that a name change has been | |
817 | * requested. | |
818 | */ | |
51055be8 | 819 | if (ifm->ifi_index > 0 && ifname[0]) { |
da5e0494 TG |
820 | err = dev_change_name(dev, ifname); |
821 | if (err < 0) | |
0157f60c | 822 | goto errout; |
da5e0494 | 823 | modified = 1; |
1da177e4 LT |
824 | } |
825 | ||
da5e0494 TG |
826 | if (tb[IFLA_BROADCAST]) { |
827 | nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len); | |
828 | send_addr_notify = 1; | |
45b50354 | 829 | modified = 1; |
1da177e4 LT |
830 | } |
831 | ||
83b496e9 PM |
832 | if (ifm->ifi_flags || ifm->ifi_change) { |
833 | unsigned int flags = ifm->ifi_flags; | |
834 | ||
835 | /* bugwards compatibility: ifi_change == 0 is treated as ~0 */ | |
836 | if (ifm->ifi_change) | |
837 | flags = (flags & ifm->ifi_change) | | |
838 | (dev->flags & ~ifm->ifi_change); | |
839 | dev_change_flags(dev, flags); | |
840 | } | |
1da177e4 | 841 | |
45b50354 LAT |
842 | if (tb[IFLA_TXQLEN]) { |
843 | if (dev->tx_queue_len != nla_get_u32(tb[IFLA_TXQLEN])) { | |
844 | dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]); | |
845 | modified = 1; | |
846 | } | |
847 | } | |
b00055aa | 848 | |
da5e0494 | 849 | if (tb[IFLA_OPERSTATE]) |
45b50354 | 850 | modified |= set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]), false); |
b00055aa | 851 | |
da5e0494 | 852 | if (tb[IFLA_LINKMODE]) { |
45b50354 LAT |
853 | if (dev->link_mode != nla_get_u8(tb[IFLA_LINKMODE])) { |
854 | write_lock_bh(&dev_base_lock); | |
855 | dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]); | |
856 | write_lock_bh(&dev_base_lock); | |
857 | modified = 1; | |
858 | } | |
b00055aa SR |
859 | } |
860 | ||
1da177e4 LT |
861 | err = 0; |
862 | ||
0157f60c | 863 | errout: |
da5e0494 TG |
864 | if (err < 0 && modified && net_ratelimit()) |
865 | printk(KERN_WARNING "A link change request failed with " | |
866 | "some changes comitted already. Interface %s may " | |
867 | "have been left with an inconsistent configuration, " | |
868 | "please check.\n", dev->name); | |
869 | ||
1da177e4 LT |
870 | if (send_addr_notify) |
871 | call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); | |
45b50354 LAT |
872 | |
873 | if (modified) | |
874 | netdev_state_change(dev); | |
875 | ||
0157f60c PM |
876 | return err; |
877 | } | |
1da177e4 | 878 | |
0157f60c PM |
879 | static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) |
880 | { | |
881d966b | 881 | struct net *net = skb->sk->sk_net; |
0157f60c PM |
882 | struct ifinfomsg *ifm; |
883 | struct net_device *dev; | |
884 | int err; | |
885 | struct nlattr *tb[IFLA_MAX+1]; | |
886 | char ifname[IFNAMSIZ]; | |
887 | ||
888 | err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); | |
889 | if (err < 0) | |
890 | goto errout; | |
891 | ||
892 | if (tb[IFLA_IFNAME]) | |
893 | nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); | |
894 | else | |
895 | ifname[0] = '\0'; | |
896 | ||
897 | err = -EINVAL; | |
898 | ifm = nlmsg_data(nlh); | |
899 | if (ifm->ifi_index > 0) | |
881d966b | 900 | dev = dev_get_by_index(net, ifm->ifi_index); |
0157f60c | 901 | else if (tb[IFLA_IFNAME]) |
881d966b | 902 | dev = dev_get_by_name(net, ifname); |
0157f60c PM |
903 | else |
904 | goto errout; | |
905 | ||
906 | if (dev == NULL) { | |
907 | err = -ENODEV; | |
908 | goto errout; | |
909 | } | |
910 | ||
911 | if (tb[IFLA_ADDRESS] && | |
912 | nla_len(tb[IFLA_ADDRESS]) < dev->addr_len) | |
913 | goto errout_dev; | |
914 | ||
915 | if (tb[IFLA_BROADCAST] && | |
916 | nla_len(tb[IFLA_BROADCAST]) < dev->addr_len) | |
917 | goto errout_dev; | |
918 | ||
38f7b870 | 919 | err = do_setlink(dev, ifm, tb, ifname, 0); |
0157f60c | 920 | errout_dev: |
1da177e4 | 921 | dev_put(dev); |
da5e0494 | 922 | errout: |
1da177e4 LT |
923 | return err; |
924 | } | |
925 | ||
38f7b870 PM |
926 | static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) |
927 | { | |
881d966b | 928 | struct net *net = skb->sk->sk_net; |
38f7b870 PM |
929 | const struct rtnl_link_ops *ops; |
930 | struct net_device *dev; | |
931 | struct ifinfomsg *ifm; | |
932 | char ifname[IFNAMSIZ]; | |
933 | struct nlattr *tb[IFLA_MAX+1]; | |
934 | int err; | |
935 | ||
936 | err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); | |
937 | if (err < 0) | |
938 | return err; | |
939 | ||
940 | if (tb[IFLA_IFNAME]) | |
941 | nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); | |
942 | ||
943 | ifm = nlmsg_data(nlh); | |
944 | if (ifm->ifi_index > 0) | |
881d966b | 945 | dev = __dev_get_by_index(net, ifm->ifi_index); |
38f7b870 | 946 | else if (tb[IFLA_IFNAME]) |
881d966b | 947 | dev = __dev_get_by_name(net, ifname); |
38f7b870 PM |
948 | else |
949 | return -EINVAL; | |
950 | ||
951 | if (!dev) | |
952 | return -ENODEV; | |
953 | ||
954 | ops = dev->rtnl_link_ops; | |
955 | if (!ops) | |
956 | return -EOPNOTSUPP; | |
957 | ||
958 | ops->dellink(dev); | |
959 | return 0; | |
960 | } | |
961 | ||
881d966b | 962 | struct net_device *rtnl_create_link(struct net *net, char *ifname, |
e7199288 PE |
963 | const struct rtnl_link_ops *ops, struct nlattr *tb[]) |
964 | { | |
965 | int err; | |
966 | struct net_device *dev; | |
967 | ||
968 | err = -ENOMEM; | |
969 | dev = alloc_netdev(ops->priv_size, ifname, ops->setup); | |
970 | if (!dev) | |
971 | goto err; | |
972 | ||
973 | if (strchr(dev->name, '%')) { | |
974 | err = dev_alloc_name(dev, dev->name); | |
975 | if (err < 0) | |
976 | goto err_free; | |
977 | } | |
978 | ||
881d966b | 979 | dev->nd_net = net; |
e7199288 PE |
980 | dev->rtnl_link_ops = ops; |
981 | ||
982 | if (tb[IFLA_MTU]) | |
983 | dev->mtu = nla_get_u32(tb[IFLA_MTU]); | |
984 | if (tb[IFLA_ADDRESS]) | |
985 | memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]), | |
986 | nla_len(tb[IFLA_ADDRESS])); | |
987 | if (tb[IFLA_BROADCAST]) | |
988 | memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]), | |
989 | nla_len(tb[IFLA_BROADCAST])); | |
990 | if (tb[IFLA_TXQLEN]) | |
991 | dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]); | |
992 | if (tb[IFLA_OPERSTATE]) | |
45b50354 | 993 | set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]), true); |
e7199288 PE |
994 | if (tb[IFLA_LINKMODE]) |
995 | dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]); | |
996 | ||
997 | return dev; | |
998 | ||
999 | err_free: | |
1000 | free_netdev(dev); | |
1001 | err: | |
1002 | return ERR_PTR(err); | |
1003 | } | |
1004 | ||
38f7b870 PM |
1005 | static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) |
1006 | { | |
881d966b | 1007 | struct net *net = skb->sk->sk_net; |
38f7b870 PM |
1008 | const struct rtnl_link_ops *ops; |
1009 | struct net_device *dev; | |
1010 | struct ifinfomsg *ifm; | |
1011 | char kind[MODULE_NAME_LEN]; | |
1012 | char ifname[IFNAMSIZ]; | |
1013 | struct nlattr *tb[IFLA_MAX+1]; | |
1014 | struct nlattr *linkinfo[IFLA_INFO_MAX+1]; | |
1015 | int err; | |
1016 | ||
8072f085 | 1017 | #ifdef CONFIG_KMOD |
38f7b870 | 1018 | replay: |
8072f085 | 1019 | #endif |
38f7b870 PM |
1020 | err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); |
1021 | if (err < 0) | |
1022 | return err; | |
1023 | ||
1024 | if (tb[IFLA_IFNAME]) | |
1025 | nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); | |
1026 | else | |
1027 | ifname[0] = '\0'; | |
1028 | ||
1029 | ifm = nlmsg_data(nlh); | |
1030 | if (ifm->ifi_index > 0) | |
881d966b | 1031 | dev = __dev_get_by_index(net, ifm->ifi_index); |
38f7b870 | 1032 | else if (ifname[0]) |
881d966b | 1033 | dev = __dev_get_by_name(net, ifname); |
38f7b870 PM |
1034 | else |
1035 | dev = NULL; | |
1036 | ||
1037 | if (tb[IFLA_LINKINFO]) { | |
1038 | err = nla_parse_nested(linkinfo, IFLA_INFO_MAX, | |
1039 | tb[IFLA_LINKINFO], ifla_info_policy); | |
1040 | if (err < 0) | |
1041 | return err; | |
1042 | } else | |
1043 | memset(linkinfo, 0, sizeof(linkinfo)); | |
1044 | ||
1045 | if (linkinfo[IFLA_INFO_KIND]) { | |
1046 | nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind)); | |
1047 | ops = rtnl_link_ops_get(kind); | |
1048 | } else { | |
1049 | kind[0] = '\0'; | |
1050 | ops = NULL; | |
1051 | } | |
1052 | ||
1053 | if (1) { | |
1054 | struct nlattr *attr[ops ? ops->maxtype + 1 : 0], **data = NULL; | |
1055 | ||
1056 | if (ops) { | |
1057 | if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) { | |
1058 | err = nla_parse_nested(attr, ops->maxtype, | |
1059 | linkinfo[IFLA_INFO_DATA], | |
1060 | ops->policy); | |
1061 | if (err < 0) | |
1062 | return err; | |
1063 | data = attr; | |
1064 | } | |
1065 | if (ops->validate) { | |
1066 | err = ops->validate(tb, data); | |
1067 | if (err < 0) | |
1068 | return err; | |
1069 | } | |
1070 | } | |
1071 | ||
1072 | if (dev) { | |
1073 | int modified = 0; | |
1074 | ||
1075 | if (nlh->nlmsg_flags & NLM_F_EXCL) | |
1076 | return -EEXIST; | |
1077 | if (nlh->nlmsg_flags & NLM_F_REPLACE) | |
1078 | return -EOPNOTSUPP; | |
1079 | ||
1080 | if (linkinfo[IFLA_INFO_DATA]) { | |
1081 | if (!ops || ops != dev->rtnl_link_ops || | |
1082 | !ops->changelink) | |
1083 | return -EOPNOTSUPP; | |
1084 | ||
1085 | err = ops->changelink(dev, tb, data); | |
1086 | if (err < 0) | |
1087 | return err; | |
1088 | modified = 1; | |
1089 | } | |
1090 | ||
1091 | return do_setlink(dev, ifm, tb, ifname, modified); | |
1092 | } | |
1093 | ||
1094 | if (!(nlh->nlmsg_flags & NLM_F_CREATE)) | |
1095 | return -ENODEV; | |
1096 | ||
1097 | if (ifm->ifi_index || ifm->ifi_flags || ifm->ifi_change) | |
1098 | return -EOPNOTSUPP; | |
0e06877c | 1099 | if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO]) |
38f7b870 PM |
1100 | return -EOPNOTSUPP; |
1101 | ||
1102 | if (!ops) { | |
1103 | #ifdef CONFIG_KMOD | |
1104 | if (kind[0]) { | |
1105 | __rtnl_unlock(); | |
1106 | request_module("rtnl-link-%s", kind); | |
1107 | rtnl_lock(); | |
1108 | ops = rtnl_link_ops_get(kind); | |
1109 | if (ops) | |
1110 | goto replay; | |
1111 | } | |
1112 | #endif | |
1113 | return -EOPNOTSUPP; | |
1114 | } | |
1115 | ||
1116 | if (!ifname[0]) | |
1117 | snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind); | |
e7199288 | 1118 | |
881d966b | 1119 | dev = rtnl_create_link(net, ifname, ops, tb); |
e7199288 PE |
1120 | |
1121 | if (IS_ERR(dev)) | |
1122 | err = PTR_ERR(dev); | |
1123 | else if (ops->newlink) | |
2d85cba2 PM |
1124 | err = ops->newlink(dev, tb, data); |
1125 | else | |
1126 | err = register_netdevice(dev); | |
e7199288 PE |
1127 | |
1128 | if (err < 0 && !IS_ERR(dev)) | |
38f7b870 PM |
1129 | free_netdev(dev); |
1130 | return err; | |
1131 | } | |
1132 | } | |
1133 | ||
b60c5115 | 1134 | static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
711e2c33 | 1135 | { |
881d966b | 1136 | struct net *net = skb->sk->sk_net; |
b60c5115 TG |
1137 | struct ifinfomsg *ifm; |
1138 | struct nlattr *tb[IFLA_MAX+1]; | |
1139 | struct net_device *dev = NULL; | |
1140 | struct sk_buff *nskb; | |
339bf98f | 1141 | int err; |
711e2c33 | 1142 | |
b60c5115 TG |
1143 | err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); |
1144 | if (err < 0) | |
9918f230 | 1145 | return err; |
b60c5115 TG |
1146 | |
1147 | ifm = nlmsg_data(nlh); | |
51055be8 | 1148 | if (ifm->ifi_index > 0) { |
881d966b | 1149 | dev = dev_get_by_index(net, ifm->ifi_index); |
b60c5115 TG |
1150 | if (dev == NULL) |
1151 | return -ENODEV; | |
1152 | } else | |
711e2c33 | 1153 | return -EINVAL; |
711e2c33 | 1154 | |
38f7b870 | 1155 | nskb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL); |
b60c5115 TG |
1156 | if (nskb == NULL) { |
1157 | err = -ENOBUFS; | |
1158 | goto errout; | |
1159 | } | |
1160 | ||
575c3e2a PM |
1161 | err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).pid, |
1162 | nlh->nlmsg_seq, 0, 0); | |
26932566 PM |
1163 | if (err < 0) { |
1164 | /* -EMSGSIZE implies BUG in if_nlmsg_size */ | |
1165 | WARN_ON(err == -EMSGSIZE); | |
1166 | kfree_skb(nskb); | |
1167 | goto errout; | |
1168 | } | |
97c53cac | 1169 | err = rtnl_unicast(nskb, net, NETLINK_CB(skb).pid); |
b60c5115 | 1170 | errout: |
711e2c33 | 1171 | dev_put(dev); |
711e2c33 | 1172 | |
b60c5115 | 1173 | return err; |
711e2c33 | 1174 | } |
711e2c33 | 1175 | |
42bad1da | 1176 | static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb) |
1da177e4 LT |
1177 | { |
1178 | int idx; | |
1179 | int s_idx = cb->family; | |
1180 | ||
1181 | if (s_idx == 0) | |
1182 | s_idx = 1; | |
1183 | for (idx=1; idx<NPROTO; idx++) { | |
1184 | int type = cb->nlh->nlmsg_type-RTM_BASE; | |
1185 | if (idx < s_idx || idx == PF_PACKET) | |
1186 | continue; | |
e2849863 TG |
1187 | if (rtnl_msg_handlers[idx] == NULL || |
1188 | rtnl_msg_handlers[idx][type].dumpit == NULL) | |
1da177e4 LT |
1189 | continue; |
1190 | if (idx > s_idx) | |
1191 | memset(&cb->args[0], 0, sizeof(cb->args)); | |
e2849863 | 1192 | if (rtnl_msg_handlers[idx][type].dumpit(skb, cb)) |
1da177e4 LT |
1193 | break; |
1194 | } | |
1195 | cb->family = idx; | |
1196 | ||
1197 | return skb->len; | |
1198 | } | |
1199 | ||
1200 | void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change) | |
1201 | { | |
4b3da706 | 1202 | struct net *net = dev->nd_net; |
1da177e4 | 1203 | struct sk_buff *skb; |
0ec6d3f4 | 1204 | int err = -ENOBUFS; |
1da177e4 | 1205 | |
38f7b870 | 1206 | skb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL); |
0ec6d3f4 TG |
1207 | if (skb == NULL) |
1208 | goto errout; | |
1da177e4 | 1209 | |
575c3e2a | 1210 | err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0); |
26932566 PM |
1211 | if (err < 0) { |
1212 | /* -EMSGSIZE implies BUG in if_nlmsg_size() */ | |
1213 | WARN_ON(err == -EMSGSIZE); | |
1214 | kfree_skb(skb); | |
1215 | goto errout; | |
1216 | } | |
4b3da706 | 1217 | err = rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_KERNEL); |
0ec6d3f4 TG |
1218 | errout: |
1219 | if (err < 0) | |
4b3da706 | 1220 | rtnl_set_sk_err(net, RTNLGRP_LINK, err); |
1da177e4 LT |
1221 | } |
1222 | ||
1da177e4 LT |
1223 | /* Protected by RTNL sempahore. */ |
1224 | static struct rtattr **rta_buf; | |
1225 | static int rtattr_max; | |
1226 | ||
1227 | /* Process one rtnetlink message. */ | |
1228 | ||
1d00a4eb | 1229 | static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) |
1da177e4 | 1230 | { |
97c53cac | 1231 | struct net *net = skb->sk->sk_net; |
e2849863 | 1232 | rtnl_doit_func doit; |
1da177e4 LT |
1233 | int sz_idx, kind; |
1234 | int min_len; | |
1235 | int family; | |
1236 | int type; | |
1c2d670f | 1237 | int err; |
1da177e4 | 1238 | |
1da177e4 | 1239 | type = nlh->nlmsg_type; |
1da177e4 | 1240 | if (type > RTM_MAX) |
038890fe | 1241 | return -EOPNOTSUPP; |
1da177e4 LT |
1242 | |
1243 | type -= RTM_BASE; | |
1244 | ||
1245 | /* All the messages must have at least 1 byte length */ | |
1246 | if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg))) | |
1247 | return 0; | |
1248 | ||
1249 | family = ((struct rtgenmsg*)NLMSG_DATA(nlh))->rtgen_family; | |
1d00a4eb TG |
1250 | if (family >= NPROTO) |
1251 | return -EAFNOSUPPORT; | |
1da177e4 | 1252 | |
1da177e4 LT |
1253 | sz_idx = type>>2; |
1254 | kind = type&3; | |
1255 | ||
1d00a4eb TG |
1256 | if (kind != 2 && security_netlink_recv(skb, CAP_NET_ADMIN)) |
1257 | return -EPERM; | |
1da177e4 LT |
1258 | |
1259 | if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) { | |
97c53cac | 1260 | struct sock *rtnl; |
e2849863 | 1261 | rtnl_dumpit_func dumpit; |
1da177e4 | 1262 | |
e2849863 TG |
1263 | dumpit = rtnl_get_dumpit(family, type); |
1264 | if (dumpit == NULL) | |
038890fe | 1265 | return -EOPNOTSUPP; |
9ac4a169 | 1266 | |
1c2d670f | 1267 | __rtnl_unlock(); |
97c53cac | 1268 | rtnl = net->rtnl; |
1c2d670f PM |
1269 | err = netlink_dump_start(rtnl, skb, nlh, dumpit, NULL); |
1270 | rtnl_lock(); | |
1271 | return err; | |
1da177e4 LT |
1272 | } |
1273 | ||
1274 | memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *))); | |
1275 | ||
1276 | min_len = rtm_min[sz_idx]; | |
1277 | if (nlh->nlmsg_len < min_len) | |
1d00a4eb | 1278 | return -EINVAL; |
1da177e4 LT |
1279 | |
1280 | if (nlh->nlmsg_len > min_len) { | |
1281 | int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len); | |
1282 | struct rtattr *attr = (void*)nlh + NLMSG_ALIGN(min_len); | |
1283 | ||
1284 | while (RTA_OK(attr, attrlen)) { | |
1285 | unsigned flavor = attr->rta_type; | |
1286 | if (flavor) { | |
1287 | if (flavor > rta_max[sz_idx]) | |
1d00a4eb | 1288 | return -EINVAL; |
1da177e4 LT |
1289 | rta_buf[flavor-1] = attr; |
1290 | } | |
1291 | attr = RTA_NEXT(attr, attrlen); | |
1292 | } | |
1293 | } | |
1294 | ||
e2849863 TG |
1295 | doit = rtnl_get_doit(family, type); |
1296 | if (doit == NULL) | |
038890fe | 1297 | return -EOPNOTSUPP; |
1da177e4 | 1298 | |
1d00a4eb | 1299 | return doit(skb, nlh, (void *)&rta_buf[0]); |
1da177e4 LT |
1300 | } |
1301 | ||
cd40b7d3 | 1302 | static void rtnetlink_rcv(struct sk_buff *skb) |
1da177e4 | 1303 | { |
cd40b7d3 DL |
1304 | rtnl_lock(); |
1305 | netlink_rcv_skb(skb, &rtnetlink_rcv_msg); | |
1306 | rtnl_unlock(); | |
1da177e4 LT |
1307 | } |
1308 | ||
1da177e4 LT |
1309 | static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr) |
1310 | { | |
1311 | struct net_device *dev = ptr; | |
e9dc8653 | 1312 | |
1da177e4 LT |
1313 | switch (event) { |
1314 | case NETDEV_UNREGISTER: | |
1315 | rtmsg_ifinfo(RTM_DELLINK, dev, ~0U); | |
1316 | break; | |
1317 | case NETDEV_REGISTER: | |
1318 | rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U); | |
1319 | break; | |
1320 | case NETDEV_UP: | |
1321 | case NETDEV_DOWN: | |
1322 | rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING); | |
1323 | break; | |
1324 | case NETDEV_CHANGE: | |
1325 | case NETDEV_GOING_DOWN: | |
1326 | break; | |
1327 | default: | |
1328 | rtmsg_ifinfo(RTM_NEWLINK, dev, 0); | |
1329 | break; | |
1330 | } | |
1331 | return NOTIFY_DONE; | |
1332 | } | |
1333 | ||
1334 | static struct notifier_block rtnetlink_dev_notifier = { | |
1335 | .notifier_call = rtnetlink_event, | |
1336 | }; | |
1337 | ||
97c53cac DL |
1338 | |
1339 | static int rtnetlink_net_init(struct net *net) | |
1340 | { | |
1341 | struct sock *sk; | |
1342 | sk = netlink_kernel_create(net, NETLINK_ROUTE, RTNLGRP_MAX, | |
1343 | rtnetlink_rcv, &rtnl_mutex, THIS_MODULE); | |
1344 | if (!sk) | |
1345 | return -ENOMEM; | |
97c53cac DL |
1346 | net->rtnl = sk; |
1347 | return 0; | |
1348 | } | |
1349 | ||
1350 | static void rtnetlink_net_exit(struct net *net) | |
1351 | { | |
775516bf DL |
1352 | netlink_kernel_release(net->rtnl); |
1353 | net->rtnl = NULL; | |
97c53cac DL |
1354 | } |
1355 | ||
1356 | static struct pernet_operations rtnetlink_net_ops = { | |
1357 | .init = rtnetlink_net_init, | |
1358 | .exit = rtnetlink_net_exit, | |
1359 | }; | |
1360 | ||
1da177e4 LT |
1361 | void __init rtnetlink_init(void) |
1362 | { | |
1363 | int i; | |
1364 | ||
1365 | rtattr_max = 0; | |
1366 | for (i = 0; i < ARRAY_SIZE(rta_max); i++) | |
1367 | if (rta_max[i] > rtattr_max) | |
1368 | rtattr_max = rta_max[i]; | |
1369 | rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL); | |
1370 | if (!rta_buf) | |
1371 | panic("rtnetlink_init: cannot allocate rta_buf\n"); | |
1372 | ||
97c53cac | 1373 | if (register_pernet_subsys(&rtnetlink_net_ops)) |
1da177e4 | 1374 | panic("rtnetlink_init: cannot initialize rtnetlink\n"); |
97c53cac | 1375 | |
1da177e4 LT |
1376 | netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV); |
1377 | register_netdevice_notifier(&rtnetlink_dev_notifier); | |
340d17fc TG |
1378 | |
1379 | rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink, rtnl_dump_ifinfo); | |
1380 | rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL); | |
38f7b870 PM |
1381 | rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL); |
1382 | rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL); | |
687ad8cc TG |
1383 | |
1384 | rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all); | |
1385 | rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all); | |
1da177e4 LT |
1386 | } |
1387 | ||
1388 | EXPORT_SYMBOL(__rta_fill); | |
1da177e4 | 1389 | EXPORT_SYMBOL(rtnetlink_put_metrics); |
1da177e4 | 1390 | EXPORT_SYMBOL(rtnl_lock); |
6756ae4b | 1391 | EXPORT_SYMBOL(rtnl_trylock); |
1da177e4 | 1392 | EXPORT_SYMBOL(rtnl_unlock); |
2942e900 | 1393 | EXPORT_SYMBOL(rtnl_unicast); |
97676b6b TG |
1394 | EXPORT_SYMBOL(rtnl_notify); |
1395 | EXPORT_SYMBOL(rtnl_set_sk_err); | |
e7199288 PE |
1396 | EXPORT_SYMBOL(rtnl_create_link); |
1397 | EXPORT_SYMBOL(ifla_policy); |