Commit | Line | Data |
---|---|---|
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 | ||
1da177e4 LT |
85 | int rtattr_parse(struct rtattr *tb[], int maxattr, struct rtattr *rta, int len) |
86 | { | |
87 | memset(tb, 0, sizeof(struct rtattr*)*maxattr); | |
88 | ||
89 | while (RTA_OK(rta, len)) { | |
90 | unsigned flavor = rta->rta_type; | |
91 | if (flavor && flavor <= maxattr) | |
92 | tb[flavor-1] = rta; | |
93 | rta = RTA_NEXT(rta, len); | |
94 | } | |
95 | return 0; | |
96 | } | |
97 | ||
2371baa4 | 98 | int __rtattr_parse_nested_compat(struct rtattr *tb[], int maxattr, |
40b77c94 | 99 | struct rtattr *rta, int len) |
afdc3238 PM |
100 | { |
101 | if (RTA_PAYLOAD(rta) < len) | |
102 | return -1; | |
afdc3238 PM |
103 | if (RTA_PAYLOAD(rta) >= RTA_ALIGN(len) + sizeof(struct rtattr)) { |
104 | rta = RTA_DATA(rta) + RTA_ALIGN(len); | |
105 | return rtattr_parse_nested(tb, maxattr, rta); | |
106 | } | |
107 | memset(tb, 0, sizeof(struct rtattr *) * maxattr); | |
108 | return 0; | |
109 | } | |
110 | ||
42bad1da | 111 | static struct rtnl_link *rtnl_msg_handlers[NPROTO]; |
e2849863 TG |
112 | |
113 | static inline int rtm_msgindex(int msgtype) | |
114 | { | |
115 | int msgindex = msgtype - RTM_BASE; | |
116 | ||
117 | /* | |
118 | * msgindex < 0 implies someone tried to register a netlink | |
119 | * control code. msgindex >= RTM_NR_MSGTYPES may indicate that | |
120 | * the message type has not been added to linux/rtnetlink.h | |
121 | */ | |
122 | BUG_ON(msgindex < 0 || msgindex >= RTM_NR_MSGTYPES); | |
123 | ||
124 | return msgindex; | |
125 | } | |
126 | ||
127 | static rtnl_doit_func rtnl_get_doit(int protocol, int msgindex) | |
128 | { | |
129 | struct rtnl_link *tab; | |
130 | ||
131 | tab = rtnl_msg_handlers[protocol]; | |
51057f2f | 132 | if (tab == NULL || tab[msgindex].doit == NULL) |
e2849863 TG |
133 | tab = rtnl_msg_handlers[PF_UNSPEC]; |
134 | ||
51057f2f | 135 | return tab ? tab[msgindex].doit : NULL; |
e2849863 TG |
136 | } |
137 | ||
138 | static rtnl_dumpit_func rtnl_get_dumpit(int protocol, int msgindex) | |
139 | { | |
140 | struct rtnl_link *tab; | |
141 | ||
142 | tab = rtnl_msg_handlers[protocol]; | |
51057f2f | 143 | if (tab == NULL || tab[msgindex].dumpit == NULL) |
e2849863 TG |
144 | tab = rtnl_msg_handlers[PF_UNSPEC]; |
145 | ||
51057f2f | 146 | return tab ? tab[msgindex].dumpit : NULL; |
e2849863 TG |
147 | } |
148 | ||
149 | /** | |
150 | * __rtnl_register - Register a rtnetlink message type | |
151 | * @protocol: Protocol family or PF_UNSPEC | |
152 | * @msgtype: rtnetlink message type | |
153 | * @doit: Function pointer called for each request message | |
154 | * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message | |
155 | * | |
156 | * Registers the specified function pointers (at least one of them has | |
157 | * to be non-NULL) to be called whenever a request message for the | |
158 | * specified protocol family and message type is received. | |
159 | * | |
160 | * The special protocol family PF_UNSPEC may be used to define fallback | |
161 | * function pointers for the case when no entry for the specific protocol | |
162 | * family exists. | |
163 | * | |
164 | * Returns 0 on success or a negative error code. | |
165 | */ | |
166 | int __rtnl_register(int protocol, int msgtype, | |
167 | rtnl_doit_func doit, rtnl_dumpit_func dumpit) | |
168 | { | |
169 | struct rtnl_link *tab; | |
170 | int msgindex; | |
171 | ||
172 | BUG_ON(protocol < 0 || protocol >= NPROTO); | |
173 | msgindex = rtm_msgindex(msgtype); | |
174 | ||
175 | tab = rtnl_msg_handlers[protocol]; | |
176 | if (tab == NULL) { | |
177 | tab = kcalloc(RTM_NR_MSGTYPES, sizeof(*tab), GFP_KERNEL); | |
178 | if (tab == NULL) | |
179 | return -ENOBUFS; | |
180 | ||
181 | rtnl_msg_handlers[protocol] = tab; | |
182 | } | |
183 | ||
184 | if (doit) | |
185 | tab[msgindex].doit = doit; | |
186 | ||
187 | if (dumpit) | |
188 | tab[msgindex].dumpit = dumpit; | |
189 | ||
190 | return 0; | |
191 | } | |
192 | ||
193 | EXPORT_SYMBOL_GPL(__rtnl_register); | |
194 | ||
195 | /** | |
196 | * rtnl_register - Register a rtnetlink message type | |
197 | * | |
198 | * Identical to __rtnl_register() but panics on failure. This is useful | |
199 | * as failure of this function is very unlikely, it can only happen due | |
200 | * to lack of memory when allocating the chain to store all message | |
201 | * handlers for a protocol. Meant for use in init functions where lack | |
202 | * of memory implies no sense in continueing. | |
203 | */ | |
204 | void rtnl_register(int protocol, int msgtype, | |
205 | rtnl_doit_func doit, rtnl_dumpit_func dumpit) | |
206 | { | |
207 | if (__rtnl_register(protocol, msgtype, doit, dumpit) < 0) | |
208 | panic("Unable to register rtnetlink message handler, " | |
209 | "protocol = %d, message type = %d\n", | |
210 | protocol, msgtype); | |
211 | } | |
212 | ||
213 | EXPORT_SYMBOL_GPL(rtnl_register); | |
214 | ||
215 | /** | |
216 | * rtnl_unregister - Unregister a rtnetlink message type | |
217 | * @protocol: Protocol family or PF_UNSPEC | |
218 | * @msgtype: rtnetlink message type | |
219 | * | |
220 | * Returns 0 on success or a negative error code. | |
221 | */ | |
222 | int rtnl_unregister(int protocol, int msgtype) | |
223 | { | |
224 | int msgindex; | |
225 | ||
226 | BUG_ON(protocol < 0 || protocol >= NPROTO); | |
227 | msgindex = rtm_msgindex(msgtype); | |
228 | ||
229 | if (rtnl_msg_handlers[protocol] == NULL) | |
230 | return -ENOENT; | |
231 | ||
232 | rtnl_msg_handlers[protocol][msgindex].doit = NULL; | |
233 | rtnl_msg_handlers[protocol][msgindex].dumpit = NULL; | |
234 | ||
235 | return 0; | |
236 | } | |
237 | ||
238 | EXPORT_SYMBOL_GPL(rtnl_unregister); | |
239 | ||
240 | /** | |
241 | * rtnl_unregister_all - Unregister all rtnetlink message type of a protocol | |
242 | * @protocol : Protocol family or PF_UNSPEC | |
243 | * | |
244 | * Identical to calling rtnl_unregster() for all registered message types | |
245 | * of a certain protocol family. | |
246 | */ | |
247 | void rtnl_unregister_all(int protocol) | |
248 | { | |
249 | BUG_ON(protocol < 0 || protocol >= NPROTO); | |
250 | ||
251 | kfree(rtnl_msg_handlers[protocol]); | |
252 | rtnl_msg_handlers[protocol] = NULL; | |
253 | } | |
254 | ||
255 | EXPORT_SYMBOL_GPL(rtnl_unregister_all); | |
1da177e4 | 256 | |
38f7b870 PM |
257 | static LIST_HEAD(link_ops); |
258 | ||
259 | /** | |
260 | * __rtnl_link_register - Register rtnl_link_ops with rtnetlink. | |
261 | * @ops: struct rtnl_link_ops * to register | |
262 | * | |
263 | * The caller must hold the rtnl_mutex. This function should be used | |
264 | * by drivers that create devices during module initialization. It | |
265 | * must be called before registering the devices. | |
266 | * | |
267 | * Returns 0 on success or a negative error code. | |
268 | */ | |
269 | int __rtnl_link_register(struct rtnl_link_ops *ops) | |
270 | { | |
2d85cba2 PM |
271 | if (!ops->dellink) |
272 | ops->dellink = unregister_netdevice; | |
273 | ||
38f7b870 PM |
274 | list_add_tail(&ops->list, &link_ops); |
275 | return 0; | |
276 | } | |
277 | ||
278 | EXPORT_SYMBOL_GPL(__rtnl_link_register); | |
279 | ||
280 | /** | |
281 | * rtnl_link_register - Register rtnl_link_ops with rtnetlink. | |
282 | * @ops: struct rtnl_link_ops * to register | |
283 | * | |
284 | * Returns 0 on success or a negative error code. | |
285 | */ | |
286 | int rtnl_link_register(struct rtnl_link_ops *ops) | |
287 | { | |
288 | int err; | |
289 | ||
290 | rtnl_lock(); | |
291 | err = __rtnl_link_register(ops); | |
292 | rtnl_unlock(); | |
293 | return err; | |
294 | } | |
295 | ||
296 | EXPORT_SYMBOL_GPL(rtnl_link_register); | |
297 | ||
298 | /** | |
299 | * __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink. | |
300 | * @ops: struct rtnl_link_ops * to unregister | |
301 | * | |
2d85cba2 | 302 | * The caller must hold the rtnl_mutex. |
38f7b870 PM |
303 | */ |
304 | void __rtnl_link_unregister(struct rtnl_link_ops *ops) | |
305 | { | |
2d85cba2 | 306 | struct net_device *dev, *n; |
881d966b | 307 | struct net *net; |
2d85cba2 | 308 | |
881d966b | 309 | for_each_net(net) { |
68365458 | 310 | restart: |
881d966b | 311 | for_each_netdev_safe(net, dev, n) { |
68365458 | 312 | if (dev->rtnl_link_ops == ops) { |
881d966b | 313 | ops->dellink(dev); |
68365458 PM |
314 | goto restart; |
315 | } | |
881d966b | 316 | } |
2d85cba2 | 317 | } |
38f7b870 PM |
318 | list_del(&ops->list); |
319 | } | |
320 | ||
321 | EXPORT_SYMBOL_GPL(__rtnl_link_unregister); | |
322 | ||
323 | /** | |
324 | * rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink. | |
325 | * @ops: struct rtnl_link_ops * to unregister | |
326 | */ | |
327 | void rtnl_link_unregister(struct rtnl_link_ops *ops) | |
328 | { | |
329 | rtnl_lock(); | |
330 | __rtnl_link_unregister(ops); | |
331 | rtnl_unlock(); | |
332 | } | |
333 | ||
334 | EXPORT_SYMBOL_GPL(rtnl_link_unregister); | |
335 | ||
336 | static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind) | |
337 | { | |
338 | const struct rtnl_link_ops *ops; | |
339 | ||
340 | list_for_each_entry(ops, &link_ops, list) { | |
341 | if (!strcmp(ops->kind, kind)) | |
342 | return ops; | |
343 | } | |
344 | return NULL; | |
345 | } | |
346 | ||
347 | static size_t rtnl_link_get_size(const struct net_device *dev) | |
348 | { | |
349 | const struct rtnl_link_ops *ops = dev->rtnl_link_ops; | |
350 | size_t size; | |
351 | ||
352 | if (!ops) | |
353 | return 0; | |
354 | ||
355 | size = nlmsg_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */ | |
356 | nlmsg_total_size(strlen(ops->kind) + 1); /* IFLA_INFO_KIND */ | |
357 | ||
358 | if (ops->get_size) | |
359 | /* IFLA_INFO_DATA + nested data */ | |
360 | size += nlmsg_total_size(sizeof(struct nlattr)) + | |
361 | ops->get_size(dev); | |
362 | ||
363 | if (ops->get_xstats_size) | |
364 | size += ops->get_xstats_size(dev); /* IFLA_INFO_XSTATS */ | |
365 | ||
366 | return size; | |
367 | } | |
368 | ||
369 | static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev) | |
370 | { | |
371 | const struct rtnl_link_ops *ops = dev->rtnl_link_ops; | |
372 | struct nlattr *linkinfo, *data; | |
373 | int err = -EMSGSIZE; | |
374 | ||
375 | linkinfo = nla_nest_start(skb, IFLA_LINKINFO); | |
376 | if (linkinfo == NULL) | |
377 | goto out; | |
378 | ||
379 | if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0) | |
380 | goto err_cancel_link; | |
381 | if (ops->fill_xstats) { | |
382 | err = ops->fill_xstats(skb, dev); | |
383 | if (err < 0) | |
384 | goto err_cancel_link; | |
385 | } | |
386 | if (ops->fill_info) { | |
387 | data = nla_nest_start(skb, IFLA_INFO_DATA); | |
388 | if (data == NULL) | |
389 | goto err_cancel_link; | |
390 | err = ops->fill_info(skb, dev); | |
391 | if (err < 0) | |
392 | goto err_cancel_data; | |
393 | nla_nest_end(skb, data); | |
394 | } | |
395 | ||
396 | nla_nest_end(skb, linkinfo); | |
397 | return 0; | |
398 | ||
399 | err_cancel_data: | |
400 | nla_nest_cancel(skb, data); | |
401 | err_cancel_link: | |
402 | nla_nest_cancel(skb, linkinfo); | |
403 | out: | |
404 | return err; | |
405 | } | |
406 | ||
db46edc6 | 407 | static const int rtm_min[RTM_NR_FAMILIES] = |
1da177e4 | 408 | { |
f90a0a74 TG |
409 | [RTM_FAM(RTM_NEWLINK)] = NLMSG_LENGTH(sizeof(struct ifinfomsg)), |
410 | [RTM_FAM(RTM_NEWADDR)] = NLMSG_LENGTH(sizeof(struct ifaddrmsg)), | |
411 | [RTM_FAM(RTM_NEWROUTE)] = NLMSG_LENGTH(sizeof(struct rtmsg)), | |
14c0b97d | 412 | [RTM_FAM(RTM_NEWRULE)] = NLMSG_LENGTH(sizeof(struct fib_rule_hdr)), |
f90a0a74 TG |
413 | [RTM_FAM(RTM_NEWQDISC)] = NLMSG_LENGTH(sizeof(struct tcmsg)), |
414 | [RTM_FAM(RTM_NEWTCLASS)] = NLMSG_LENGTH(sizeof(struct tcmsg)), | |
415 | [RTM_FAM(RTM_NEWTFILTER)] = NLMSG_LENGTH(sizeof(struct tcmsg)), | |
416 | [RTM_FAM(RTM_NEWACTION)] = NLMSG_LENGTH(sizeof(struct tcamsg)), | |
f90a0a74 TG |
417 | [RTM_FAM(RTM_GETMULTICAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)), |
418 | [RTM_FAM(RTM_GETANYCAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)), | |
1da177e4 LT |
419 | }; |
420 | ||
db46edc6 | 421 | static const int rta_max[RTM_NR_FAMILIES] = |
1da177e4 | 422 | { |
f90a0a74 TG |
423 | [RTM_FAM(RTM_NEWLINK)] = IFLA_MAX, |
424 | [RTM_FAM(RTM_NEWADDR)] = IFA_MAX, | |
425 | [RTM_FAM(RTM_NEWROUTE)] = RTA_MAX, | |
14c0b97d | 426 | [RTM_FAM(RTM_NEWRULE)] = FRA_MAX, |
f90a0a74 TG |
427 | [RTM_FAM(RTM_NEWQDISC)] = TCA_MAX, |
428 | [RTM_FAM(RTM_NEWTCLASS)] = TCA_MAX, | |
429 | [RTM_FAM(RTM_NEWTFILTER)] = TCA_MAX, | |
430 | [RTM_FAM(RTM_NEWACTION)] = TCAA_MAX, | |
1da177e4 LT |
431 | }; |
432 | ||
433 | void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const void *data) | |
434 | { | |
435 | struct rtattr *rta; | |
436 | int size = RTA_LENGTH(attrlen); | |
437 | ||
438 | rta = (struct rtattr*)skb_put(skb, RTA_ALIGN(size)); | |
439 | rta->rta_type = attrtype; | |
440 | rta->rta_len = size; | |
441 | memcpy(RTA_DATA(rta), data, attrlen); | |
b3563c4f | 442 | memset(RTA_DATA(rta) + attrlen, 0, RTA_ALIGN(size) - size); |
1da177e4 LT |
443 | } |
444 | ||
445 | size_t rtattr_strlcpy(char *dest, const struct rtattr *rta, size_t size) | |
446 | { | |
447 | size_t ret = RTA_PAYLOAD(rta); | |
448 | char *src = RTA_DATA(rta); | |
449 | ||
450 | if (ret > 0 && src[ret - 1] == '\0') | |
451 | ret--; | |
452 | if (size > 0) { | |
453 | size_t len = (ret >= size) ? size - 1 : ret; | |
454 | memset(dest, 0, size); | |
455 | memcpy(dest, src, len); | |
456 | } | |
457 | return ret; | |
458 | } | |
459 | ||
97c53cac | 460 | int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned group, int echo) |
1da177e4 | 461 | { |
97c53cac | 462 | struct sock *rtnl = net->rtnl; |
1da177e4 LT |
463 | int err = 0; |
464 | ||
ac6d439d | 465 | NETLINK_CB(skb).dst_group = group; |
1da177e4 LT |
466 | if (echo) |
467 | atomic_inc(&skb->users); | |
468 | netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL); | |
469 | if (echo) | |
470 | err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT); | |
471 | return err; | |
472 | } | |
473 | ||
97c53cac | 474 | int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid) |
2942e900 | 475 | { |
97c53cac DL |
476 | struct sock *rtnl = net->rtnl; |
477 | ||
2942e900 TG |
478 | return nlmsg_unicast(rtnl, skb, pid); |
479 | } | |
480 | ||
97c53cac | 481 | int rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group, |
97676b6b TG |
482 | struct nlmsghdr *nlh, gfp_t flags) |
483 | { | |
97c53cac | 484 | struct sock *rtnl = net->rtnl; |
97676b6b TG |
485 | int report = 0; |
486 | ||
487 | if (nlh) | |
488 | report = nlmsg_report(nlh); | |
489 | ||
490 | return nlmsg_notify(rtnl, skb, pid, group, report, flags); | |
491 | } | |
492 | ||
97c53cac | 493 | void rtnl_set_sk_err(struct net *net, u32 group, int error) |
97676b6b | 494 | { |
97c53cac DL |
495 | struct sock *rtnl = net->rtnl; |
496 | ||
97676b6b TG |
497 | netlink_set_err(rtnl, 0, group, error); |
498 | } | |
499 | ||
1da177e4 LT |
500 | int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics) |
501 | { | |
2d7202bf TG |
502 | struct nlattr *mx; |
503 | int i, valid = 0; | |
504 | ||
505 | mx = nla_nest_start(skb, RTA_METRICS); | |
506 | if (mx == NULL) | |
507 | return -ENOBUFS; | |
508 | ||
509 | for (i = 0; i < RTAX_MAX; i++) { | |
510 | if (metrics[i]) { | |
511 | valid++; | |
512 | NLA_PUT_U32(skb, i+1, metrics[i]); | |
513 | } | |
1da177e4 | 514 | } |
1da177e4 | 515 | |
a57d27fc DM |
516 | if (!valid) { |
517 | nla_nest_cancel(skb, mx); | |
518 | return 0; | |
519 | } | |
2d7202bf TG |
520 | |
521 | return nla_nest_end(skb, mx); | |
522 | ||
523 | nla_put_failure: | |
524 | return nla_nest_cancel(skb, mx); | |
1da177e4 LT |
525 | } |
526 | ||
e3703b3d TG |
527 | int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id, |
528 | u32 ts, u32 tsage, long expires, u32 error) | |
529 | { | |
530 | struct rta_cacheinfo ci = { | |
531 | .rta_lastuse = jiffies_to_clock_t(jiffies - dst->lastuse), | |
532 | .rta_used = dst->__use, | |
533 | .rta_clntref = atomic_read(&(dst->__refcnt)), | |
534 | .rta_error = error, | |
535 | .rta_id = id, | |
536 | .rta_ts = ts, | |
537 | .rta_tsage = tsage, | |
538 | }; | |
539 | ||
540 | if (expires) | |
541 | ci.rta_expires = jiffies_to_clock_t(expires); | |
542 | ||
543 | return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci); | |
544 | } | |
545 | ||
546 | EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo); | |
1da177e4 | 547 | |
b00055aa SR |
548 | static void set_operstate(struct net_device *dev, unsigned char transition) |
549 | { | |
550 | unsigned char operstate = dev->operstate; | |
551 | ||
552 | switch(transition) { | |
553 | case IF_OPER_UP: | |
554 | if ((operstate == IF_OPER_DORMANT || | |
555 | operstate == IF_OPER_UNKNOWN) && | |
556 | !netif_dormant(dev)) | |
557 | operstate = IF_OPER_UP; | |
558 | break; | |
559 | ||
560 | case IF_OPER_DORMANT: | |
561 | if (operstate == IF_OPER_UP || | |
562 | operstate == IF_OPER_UNKNOWN) | |
563 | operstate = IF_OPER_DORMANT; | |
564 | break; | |
3ff50b79 | 565 | } |
b00055aa SR |
566 | |
567 | if (dev->operstate != operstate) { | |
568 | write_lock_bh(&dev_base_lock); | |
569 | dev->operstate = operstate; | |
570 | write_unlock_bh(&dev_base_lock); | |
571 | netdev_state_change(dev); | |
572 | } | |
573 | } | |
574 | ||
b60c5115 TG |
575 | static void copy_rtnl_link_stats(struct rtnl_link_stats *a, |
576 | struct net_device_stats *b) | |
1da177e4 | 577 | { |
b60c5115 TG |
578 | a->rx_packets = b->rx_packets; |
579 | a->tx_packets = b->tx_packets; | |
580 | a->rx_bytes = b->rx_bytes; | |
581 | a->tx_bytes = b->tx_bytes; | |
582 | a->rx_errors = b->rx_errors; | |
583 | a->tx_errors = b->tx_errors; | |
584 | a->rx_dropped = b->rx_dropped; | |
585 | a->tx_dropped = b->tx_dropped; | |
586 | ||
587 | a->multicast = b->multicast; | |
588 | a->collisions = b->collisions; | |
589 | ||
590 | a->rx_length_errors = b->rx_length_errors; | |
591 | a->rx_over_errors = b->rx_over_errors; | |
592 | a->rx_crc_errors = b->rx_crc_errors; | |
593 | a->rx_frame_errors = b->rx_frame_errors; | |
594 | a->rx_fifo_errors = b->rx_fifo_errors; | |
595 | a->rx_missed_errors = b->rx_missed_errors; | |
596 | ||
597 | a->tx_aborted_errors = b->tx_aborted_errors; | |
598 | a->tx_carrier_errors = b->tx_carrier_errors; | |
599 | a->tx_fifo_errors = b->tx_fifo_errors; | |
600 | a->tx_heartbeat_errors = b->tx_heartbeat_errors; | |
601 | a->tx_window_errors = b->tx_window_errors; | |
602 | ||
603 | a->rx_compressed = b->rx_compressed; | |
604 | a->tx_compressed = b->tx_compressed; | |
605 | }; | |
1da177e4 | 606 | |
38f7b870 | 607 | static inline size_t if_nlmsg_size(const struct net_device *dev) |
339bf98f TG |
608 | { |
609 | return NLMSG_ALIGN(sizeof(struct ifinfomsg)) | |
610 | + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ | |
611 | + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */ | |
612 | + nla_total_size(sizeof(struct rtnl_link_ifmap)) | |
613 | + nla_total_size(sizeof(struct rtnl_link_stats)) | |
614 | + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ | |
615 | + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */ | |
616 | + nla_total_size(4) /* IFLA_TXQLEN */ | |
617 | + nla_total_size(4) /* IFLA_WEIGHT */ | |
618 | + nla_total_size(4) /* IFLA_MTU */ | |
619 | + nla_total_size(4) /* IFLA_LINK */ | |
620 | + nla_total_size(4) /* IFLA_MASTER */ | |
621 | + nla_total_size(1) /* IFLA_OPERSTATE */ | |
38f7b870 PM |
622 | + nla_total_size(1) /* IFLA_LINKMODE */ |
623 | + rtnl_link_get_size(dev); /* IFLA_LINKINFO */ | |
339bf98f TG |
624 | } |
625 | ||
b60c5115 | 626 | static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev, |
575c3e2a PM |
627 | int type, u32 pid, u32 seq, u32 change, |
628 | unsigned int flags) | |
b60c5115 TG |
629 | { |
630 | struct ifinfomsg *ifm; | |
631 | struct nlmsghdr *nlh; | |
1da177e4 | 632 | |
b60c5115 TG |
633 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags); |
634 | if (nlh == NULL) | |
26932566 | 635 | return -EMSGSIZE; |
1da177e4 | 636 | |
b60c5115 TG |
637 | ifm = nlmsg_data(nlh); |
638 | ifm->ifi_family = AF_UNSPEC; | |
639 | ifm->__ifi_pad = 0; | |
640 | ifm->ifi_type = dev->type; | |
641 | ifm->ifi_index = dev->ifindex; | |
642 | ifm->ifi_flags = dev_get_flags(dev); | |
643 | ifm->ifi_change = change; | |
644 | ||
645 | NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name); | |
646 | NLA_PUT_U32(skb, IFLA_TXQLEN, dev->tx_queue_len); | |
b60c5115 TG |
647 | NLA_PUT_U8(skb, IFLA_OPERSTATE, |
648 | netif_running(dev) ? dev->operstate : IF_OPER_DOWN); | |
649 | NLA_PUT_U8(skb, IFLA_LINKMODE, dev->link_mode); | |
650 | NLA_PUT_U32(skb, IFLA_MTU, dev->mtu); | |
651 | ||
652 | if (dev->ifindex != dev->iflink) | |
653 | NLA_PUT_U32(skb, IFLA_LINK, dev->iflink); | |
654 | ||
655 | if (dev->master) | |
656 | NLA_PUT_U32(skb, IFLA_MASTER, dev->master->ifindex); | |
1da177e4 | 657 | |
b60c5115 TG |
658 | if (dev->qdisc_sleeping) |
659 | NLA_PUT_STRING(skb, IFLA_QDISC, dev->qdisc_sleeping->ops->id); | |
b00055aa | 660 | |
1da177e4 LT |
661 | if (1) { |
662 | struct rtnl_link_ifmap map = { | |
663 | .mem_start = dev->mem_start, | |
664 | .mem_end = dev->mem_end, | |
665 | .base_addr = dev->base_addr, | |
666 | .irq = dev->irq, | |
667 | .dma = dev->dma, | |
668 | .port = dev->if_port, | |
669 | }; | |
b60c5115 | 670 | NLA_PUT(skb, IFLA_MAP, sizeof(map), &map); |
1da177e4 LT |
671 | } |
672 | ||
673 | if (dev->addr_len) { | |
b60c5115 TG |
674 | NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr); |
675 | NLA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast); | |
1da177e4 LT |
676 | } |
677 | ||
678 | if (dev->get_stats) { | |
b60c5115 | 679 | struct net_device_stats *stats = dev->get_stats(dev); |
1da177e4 | 680 | if (stats) { |
b60c5115 TG |
681 | struct nlattr *attr; |
682 | ||
683 | attr = nla_reserve(skb, IFLA_STATS, | |
684 | sizeof(struct rtnl_link_stats)); | |
685 | if (attr == NULL) | |
686 | goto nla_put_failure; | |
687 | ||
688 | copy_rtnl_link_stats(nla_data(attr), stats); | |
1da177e4 LT |
689 | } |
690 | } | |
1da177e4 | 691 | |
38f7b870 PM |
692 | if (dev->rtnl_link_ops) { |
693 | if (rtnl_link_fill(skb, dev) < 0) | |
694 | goto nla_put_failure; | |
695 | } | |
696 | ||
b60c5115 TG |
697 | return nlmsg_end(skb, nlh); |
698 | ||
699 | nla_put_failure: | |
26932566 PM |
700 | nlmsg_cancel(skb, nlh); |
701 | return -EMSGSIZE; | |
1da177e4 LT |
702 | } |
703 | ||
b60c5115 | 704 | static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) |
1da177e4 | 705 | { |
881d966b | 706 | struct net *net = skb->sk->sk_net; |
1da177e4 LT |
707 | int idx; |
708 | int s_idx = cb->args[0]; | |
709 | struct net_device *dev; | |
710 | ||
b854272b DL |
711 | if (net != &init_net) |
712 | return 0; | |
713 | ||
7562f876 | 714 | idx = 0; |
881d966b | 715 | for_each_netdev(net, dev) { |
1da177e4 | 716 | if (idx < s_idx) |
7562f876 | 717 | goto cont; |
575c3e2a | 718 | if (rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK, |
b60c5115 TG |
719 | NETLINK_CB(cb->skb).pid, |
720 | cb->nlh->nlmsg_seq, 0, NLM_F_MULTI) <= 0) | |
1da177e4 | 721 | break; |
7562f876 PE |
722 | cont: |
723 | idx++; | |
1da177e4 | 724 | } |
1da177e4 LT |
725 | cb->args[0] = idx; |
726 | ||
727 | return skb->len; | |
728 | } | |
729 | ||
e7199288 | 730 | const struct nla_policy ifla_policy[IFLA_MAX+1] = { |
5176f91e | 731 | [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 }, |
38f7b870 PM |
732 | [IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, |
733 | [IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, | |
5176f91e | 734 | [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) }, |
da5e0494 TG |
735 | [IFLA_MTU] = { .type = NLA_U32 }, |
736 | [IFLA_TXQLEN] = { .type = NLA_U32 }, | |
737 | [IFLA_WEIGHT] = { .type = NLA_U32 }, | |
738 | [IFLA_OPERSTATE] = { .type = NLA_U8 }, | |
739 | [IFLA_LINKMODE] = { .type = NLA_U8 }, | |
d8a5ec67 | 740 | [IFLA_NET_NS_PID] = { .type = NLA_U32 }, |
da5e0494 TG |
741 | }; |
742 | ||
38f7b870 PM |
743 | static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = { |
744 | [IFLA_INFO_KIND] = { .type = NLA_STRING }, | |
745 | [IFLA_INFO_DATA] = { .type = NLA_NESTED }, | |
746 | }; | |
747 | ||
d8a5ec67 EB |
748 | static struct net *get_net_ns_by_pid(pid_t pid) |
749 | { | |
750 | struct task_struct *tsk; | |
751 | struct net *net; | |
752 | ||
753 | /* Lookup the network namespace */ | |
754 | net = ERR_PTR(-ESRCH); | |
755 | rcu_read_lock(); | |
ceaa79c4 | 756 | tsk = find_task_by_vpid(pid); |
d8a5ec67 | 757 | if (tsk) { |
cf7b708c PE |
758 | struct nsproxy *nsproxy; |
759 | nsproxy = task_nsproxy(tsk); | |
760 | if (nsproxy) | |
761 | net = get_net(nsproxy->net_ns); | |
d8a5ec67 EB |
762 | } |
763 | rcu_read_unlock(); | |
764 | return net; | |
765 | } | |
766 | ||
0157f60c | 767 | static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm, |
38f7b870 | 768 | struct nlattr **tb, char *ifname, int modified) |
1da177e4 | 769 | { |
38f7b870 | 770 | int send_addr_notify = 0; |
0157f60c | 771 | int err; |
1da177e4 | 772 | |
d8a5ec67 EB |
773 | if (tb[IFLA_NET_NS_PID]) { |
774 | struct net *net; | |
775 | net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID])); | |
776 | if (IS_ERR(net)) { | |
777 | err = PTR_ERR(net); | |
778 | goto errout; | |
779 | } | |
780 | err = dev_change_net_namespace(dev, net, ifname); | |
781 | put_net(net); | |
782 | if (err) | |
783 | goto errout; | |
784 | modified = 1; | |
785 | } | |
786 | ||
da5e0494 | 787 | if (tb[IFLA_MAP]) { |
1da177e4 LT |
788 | struct rtnl_link_ifmap *u_map; |
789 | struct ifmap k_map; | |
790 | ||
791 | if (!dev->set_config) { | |
792 | err = -EOPNOTSUPP; | |
0157f60c | 793 | goto errout; |
1da177e4 LT |
794 | } |
795 | ||
796 | if (!netif_device_present(dev)) { | |
797 | err = -ENODEV; | |
0157f60c | 798 | goto errout; |
1da177e4 | 799 | } |
1da177e4 | 800 | |
da5e0494 | 801 | u_map = nla_data(tb[IFLA_MAP]); |
1da177e4 LT |
802 | k_map.mem_start = (unsigned long) u_map->mem_start; |
803 | k_map.mem_end = (unsigned long) u_map->mem_end; | |
804 | k_map.base_addr = (unsigned short) u_map->base_addr; | |
805 | k_map.irq = (unsigned char) u_map->irq; | |
806 | k_map.dma = (unsigned char) u_map->dma; | |
807 | k_map.port = (unsigned char) u_map->port; | |
808 | ||
809 | err = dev->set_config(dev, &k_map); | |
da5e0494 | 810 | if (err < 0) |
0157f60c | 811 | goto errout; |
1da177e4 | 812 | |
da5e0494 | 813 | modified = 1; |
1da177e4 LT |
814 | } |
815 | ||
da5e0494 | 816 | if (tb[IFLA_ADDRESS]) { |
70f8e78e DM |
817 | struct sockaddr *sa; |
818 | int len; | |
819 | ||
1da177e4 LT |
820 | if (!dev->set_mac_address) { |
821 | err = -EOPNOTSUPP; | |
0157f60c | 822 | goto errout; |
1da177e4 | 823 | } |
da5e0494 | 824 | |
1da177e4 LT |
825 | if (!netif_device_present(dev)) { |
826 | err = -ENODEV; | |
0157f60c | 827 | goto errout; |
1da177e4 | 828 | } |
1da177e4 | 829 | |
70f8e78e DM |
830 | len = sizeof(sa_family_t) + dev->addr_len; |
831 | sa = kmalloc(len, GFP_KERNEL); | |
832 | if (!sa) { | |
833 | err = -ENOMEM; | |
0157f60c | 834 | goto errout; |
70f8e78e DM |
835 | } |
836 | sa->sa_family = dev->type; | |
da5e0494 | 837 | memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]), |
70f8e78e DM |
838 | dev->addr_len); |
839 | err = dev->set_mac_address(dev, sa); | |
840 | kfree(sa); | |
1da177e4 | 841 | if (err) |
0157f60c | 842 | goto errout; |
1da177e4 | 843 | send_addr_notify = 1; |
da5e0494 | 844 | modified = 1; |
1da177e4 LT |
845 | } |
846 | ||
da5e0494 TG |
847 | if (tb[IFLA_MTU]) { |
848 | err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU])); | |
849 | if (err < 0) | |
0157f60c | 850 | goto errout; |
da5e0494 | 851 | modified = 1; |
1da177e4 LT |
852 | } |
853 | ||
da5e0494 TG |
854 | /* |
855 | * Interface selected by interface index but interface | |
856 | * name provided implies that a name change has been | |
857 | * requested. | |
858 | */ | |
51055be8 | 859 | if (ifm->ifi_index > 0 && ifname[0]) { |
da5e0494 TG |
860 | err = dev_change_name(dev, ifname); |
861 | if (err < 0) | |
0157f60c | 862 | goto errout; |
da5e0494 | 863 | modified = 1; |
1da177e4 LT |
864 | } |
865 | ||
da5e0494 TG |
866 | if (tb[IFLA_BROADCAST]) { |
867 | nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len); | |
868 | send_addr_notify = 1; | |
1da177e4 LT |
869 | } |
870 | ||
83b496e9 PM |
871 | if (ifm->ifi_flags || ifm->ifi_change) { |
872 | unsigned int flags = ifm->ifi_flags; | |
873 | ||
874 | /* bugwards compatibility: ifi_change == 0 is treated as ~0 */ | |
875 | if (ifm->ifi_change) | |
876 | flags = (flags & ifm->ifi_change) | | |
877 | (dev->flags & ~ifm->ifi_change); | |
878 | dev_change_flags(dev, flags); | |
879 | } | |
1da177e4 | 880 | |
da5e0494 TG |
881 | if (tb[IFLA_TXQLEN]) |
882 | dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]); | |
b00055aa | 883 | |
da5e0494 TG |
884 | if (tb[IFLA_OPERSTATE]) |
885 | set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); | |
b00055aa | 886 | |
da5e0494 | 887 | if (tb[IFLA_LINKMODE]) { |
b00055aa | 888 | write_lock_bh(&dev_base_lock); |
da5e0494 | 889 | dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]); |
b00055aa SR |
890 | write_unlock_bh(&dev_base_lock); |
891 | } | |
892 | ||
1da177e4 LT |
893 | err = 0; |
894 | ||
0157f60c | 895 | errout: |
da5e0494 TG |
896 | if (err < 0 && modified && net_ratelimit()) |
897 | printk(KERN_WARNING "A link change request failed with " | |
898 | "some changes comitted already. Interface %s may " | |
899 | "have been left with an inconsistent configuration, " | |
900 | "please check.\n", dev->name); | |
901 | ||
1da177e4 LT |
902 | if (send_addr_notify) |
903 | call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); | |
0157f60c PM |
904 | return err; |
905 | } | |
1da177e4 | 906 | |
0157f60c PM |
907 | static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) |
908 | { | |
881d966b | 909 | struct net *net = skb->sk->sk_net; |
0157f60c PM |
910 | struct ifinfomsg *ifm; |
911 | struct net_device *dev; | |
912 | int err; | |
913 | struct nlattr *tb[IFLA_MAX+1]; | |
914 | char ifname[IFNAMSIZ]; | |
915 | ||
b854272b DL |
916 | if (net != &init_net) |
917 | return -EINVAL; | |
918 | ||
0157f60c PM |
919 | err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); |
920 | if (err < 0) | |
921 | goto errout; | |
922 | ||
923 | if (tb[IFLA_IFNAME]) | |
924 | nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); | |
925 | else | |
926 | ifname[0] = '\0'; | |
927 | ||
928 | err = -EINVAL; | |
929 | ifm = nlmsg_data(nlh); | |
930 | if (ifm->ifi_index > 0) | |
881d966b | 931 | dev = dev_get_by_index(net, ifm->ifi_index); |
0157f60c | 932 | else if (tb[IFLA_IFNAME]) |
881d966b | 933 | dev = dev_get_by_name(net, ifname); |
0157f60c PM |
934 | else |
935 | goto errout; | |
936 | ||
937 | if (dev == NULL) { | |
938 | err = -ENODEV; | |
939 | goto errout; | |
940 | } | |
941 | ||
942 | if (tb[IFLA_ADDRESS] && | |
943 | nla_len(tb[IFLA_ADDRESS]) < dev->addr_len) | |
944 | goto errout_dev; | |
945 | ||
946 | if (tb[IFLA_BROADCAST] && | |
947 | nla_len(tb[IFLA_BROADCAST]) < dev->addr_len) | |
948 | goto errout_dev; | |
949 | ||
38f7b870 | 950 | err = do_setlink(dev, ifm, tb, ifname, 0); |
0157f60c | 951 | errout_dev: |
1da177e4 | 952 | dev_put(dev); |
da5e0494 | 953 | errout: |
1da177e4 LT |
954 | return err; |
955 | } | |
956 | ||
38f7b870 PM |
957 | static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) |
958 | { | |
881d966b | 959 | struct net *net = skb->sk->sk_net; |
38f7b870 PM |
960 | const struct rtnl_link_ops *ops; |
961 | struct net_device *dev; | |
962 | struct ifinfomsg *ifm; | |
963 | char ifname[IFNAMSIZ]; | |
964 | struct nlattr *tb[IFLA_MAX+1]; | |
965 | int err; | |
966 | ||
b854272b DL |
967 | if (net != &init_net) |
968 | return -EINVAL; | |
969 | ||
38f7b870 PM |
970 | err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); |
971 | if (err < 0) | |
972 | return err; | |
973 | ||
974 | if (tb[IFLA_IFNAME]) | |
975 | nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); | |
976 | ||
977 | ifm = nlmsg_data(nlh); | |
978 | if (ifm->ifi_index > 0) | |
881d966b | 979 | dev = __dev_get_by_index(net, ifm->ifi_index); |
38f7b870 | 980 | else if (tb[IFLA_IFNAME]) |
881d966b | 981 | dev = __dev_get_by_name(net, ifname); |
38f7b870 PM |
982 | else |
983 | return -EINVAL; | |
984 | ||
985 | if (!dev) | |
986 | return -ENODEV; | |
987 | ||
988 | ops = dev->rtnl_link_ops; | |
989 | if (!ops) | |
990 | return -EOPNOTSUPP; | |
991 | ||
992 | ops->dellink(dev); | |
993 | return 0; | |
994 | } | |
995 | ||
881d966b | 996 | struct net_device *rtnl_create_link(struct net *net, char *ifname, |
e7199288 PE |
997 | const struct rtnl_link_ops *ops, struct nlattr *tb[]) |
998 | { | |
999 | int err; | |
1000 | struct net_device *dev; | |
1001 | ||
1002 | err = -ENOMEM; | |
1003 | dev = alloc_netdev(ops->priv_size, ifname, ops->setup); | |
1004 | if (!dev) | |
1005 | goto err; | |
1006 | ||
1007 | if (strchr(dev->name, '%')) { | |
1008 | err = dev_alloc_name(dev, dev->name); | |
1009 | if (err < 0) | |
1010 | goto err_free; | |
1011 | } | |
1012 | ||
881d966b | 1013 | dev->nd_net = net; |
e7199288 PE |
1014 | dev->rtnl_link_ops = ops; |
1015 | ||
1016 | if (tb[IFLA_MTU]) | |
1017 | dev->mtu = nla_get_u32(tb[IFLA_MTU]); | |
1018 | if (tb[IFLA_ADDRESS]) | |
1019 | memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]), | |
1020 | nla_len(tb[IFLA_ADDRESS])); | |
1021 | if (tb[IFLA_BROADCAST]) | |
1022 | memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]), | |
1023 | nla_len(tb[IFLA_BROADCAST])); | |
1024 | if (tb[IFLA_TXQLEN]) | |
1025 | dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]); | |
1026 | if (tb[IFLA_OPERSTATE]) | |
1027 | set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); | |
1028 | if (tb[IFLA_LINKMODE]) | |
1029 | dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]); | |
1030 | ||
1031 | return dev; | |
1032 | ||
1033 | err_free: | |
1034 | free_netdev(dev); | |
1035 | err: | |
1036 | return ERR_PTR(err); | |
1037 | } | |
1038 | ||
38f7b870 PM |
1039 | static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) |
1040 | { | |
881d966b | 1041 | struct net *net = skb->sk->sk_net; |
38f7b870 PM |
1042 | const struct rtnl_link_ops *ops; |
1043 | struct net_device *dev; | |
1044 | struct ifinfomsg *ifm; | |
1045 | char kind[MODULE_NAME_LEN]; | |
1046 | char ifname[IFNAMSIZ]; | |
1047 | struct nlattr *tb[IFLA_MAX+1]; | |
1048 | struct nlattr *linkinfo[IFLA_INFO_MAX+1]; | |
1049 | int err; | |
1050 | ||
b854272b DL |
1051 | if (net != &init_net) |
1052 | return -EINVAL; | |
1053 | ||
8072f085 | 1054 | #ifdef CONFIG_KMOD |
38f7b870 | 1055 | replay: |
8072f085 | 1056 | #endif |
38f7b870 PM |
1057 | err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); |
1058 | if (err < 0) | |
1059 | return err; | |
1060 | ||
1061 | if (tb[IFLA_IFNAME]) | |
1062 | nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); | |
1063 | else | |
1064 | ifname[0] = '\0'; | |
1065 | ||
1066 | ifm = nlmsg_data(nlh); | |
1067 | if (ifm->ifi_index > 0) | |
881d966b | 1068 | dev = __dev_get_by_index(net, ifm->ifi_index); |
38f7b870 | 1069 | else if (ifname[0]) |
881d966b | 1070 | dev = __dev_get_by_name(net, ifname); |
38f7b870 PM |
1071 | else |
1072 | dev = NULL; | |
1073 | ||
1074 | if (tb[IFLA_LINKINFO]) { | |
1075 | err = nla_parse_nested(linkinfo, IFLA_INFO_MAX, | |
1076 | tb[IFLA_LINKINFO], ifla_info_policy); | |
1077 | if (err < 0) | |
1078 | return err; | |
1079 | } else | |
1080 | memset(linkinfo, 0, sizeof(linkinfo)); | |
1081 | ||
1082 | if (linkinfo[IFLA_INFO_KIND]) { | |
1083 | nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind)); | |
1084 | ops = rtnl_link_ops_get(kind); | |
1085 | } else { | |
1086 | kind[0] = '\0'; | |
1087 | ops = NULL; | |
1088 | } | |
1089 | ||
1090 | if (1) { | |
1091 | struct nlattr *attr[ops ? ops->maxtype + 1 : 0], **data = NULL; | |
1092 | ||
1093 | if (ops) { | |
1094 | if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) { | |
1095 | err = nla_parse_nested(attr, ops->maxtype, | |
1096 | linkinfo[IFLA_INFO_DATA], | |
1097 | ops->policy); | |
1098 | if (err < 0) | |
1099 | return err; | |
1100 | data = attr; | |
1101 | } | |
1102 | if (ops->validate) { | |
1103 | err = ops->validate(tb, data); | |
1104 | if (err < 0) | |
1105 | return err; | |
1106 | } | |
1107 | } | |
1108 | ||
1109 | if (dev) { | |
1110 | int modified = 0; | |
1111 | ||
1112 | if (nlh->nlmsg_flags & NLM_F_EXCL) | |
1113 | return -EEXIST; | |
1114 | if (nlh->nlmsg_flags & NLM_F_REPLACE) | |
1115 | return -EOPNOTSUPP; | |
1116 | ||
1117 | if (linkinfo[IFLA_INFO_DATA]) { | |
1118 | if (!ops || ops != dev->rtnl_link_ops || | |
1119 | !ops->changelink) | |
1120 | return -EOPNOTSUPP; | |
1121 | ||
1122 | err = ops->changelink(dev, tb, data); | |
1123 | if (err < 0) | |
1124 | return err; | |
1125 | modified = 1; | |
1126 | } | |
1127 | ||
1128 | return do_setlink(dev, ifm, tb, ifname, modified); | |
1129 | } | |
1130 | ||
1131 | if (!(nlh->nlmsg_flags & NLM_F_CREATE)) | |
1132 | return -ENODEV; | |
1133 | ||
1134 | if (ifm->ifi_index || ifm->ifi_flags || ifm->ifi_change) | |
1135 | return -EOPNOTSUPP; | |
0e06877c | 1136 | if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO]) |
38f7b870 PM |
1137 | return -EOPNOTSUPP; |
1138 | ||
1139 | if (!ops) { | |
1140 | #ifdef CONFIG_KMOD | |
1141 | if (kind[0]) { | |
1142 | __rtnl_unlock(); | |
1143 | request_module("rtnl-link-%s", kind); | |
1144 | rtnl_lock(); | |
1145 | ops = rtnl_link_ops_get(kind); | |
1146 | if (ops) | |
1147 | goto replay; | |
1148 | } | |
1149 | #endif | |
1150 | return -EOPNOTSUPP; | |
1151 | } | |
1152 | ||
1153 | if (!ifname[0]) | |
1154 | snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind); | |
e7199288 | 1155 | |
881d966b | 1156 | dev = rtnl_create_link(net, ifname, ops, tb); |
e7199288 PE |
1157 | |
1158 | if (IS_ERR(dev)) | |
1159 | err = PTR_ERR(dev); | |
1160 | else if (ops->newlink) | |
2d85cba2 PM |
1161 | err = ops->newlink(dev, tb, data); |
1162 | else | |
1163 | err = register_netdevice(dev); | |
e7199288 PE |
1164 | |
1165 | if (err < 0 && !IS_ERR(dev)) | |
38f7b870 PM |
1166 | free_netdev(dev); |
1167 | return err; | |
1168 | } | |
1169 | } | |
1170 | ||
b60c5115 | 1171 | static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
711e2c33 | 1172 | { |
881d966b | 1173 | struct net *net = skb->sk->sk_net; |
b60c5115 TG |
1174 | struct ifinfomsg *ifm; |
1175 | struct nlattr *tb[IFLA_MAX+1]; | |
1176 | struct net_device *dev = NULL; | |
1177 | struct sk_buff *nskb; | |
339bf98f | 1178 | int err; |
711e2c33 | 1179 | |
b854272b DL |
1180 | if (net != &init_net) |
1181 | return -EINVAL; | |
1182 | ||
b60c5115 TG |
1183 | err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); |
1184 | if (err < 0) | |
9918f230 | 1185 | return err; |
b60c5115 TG |
1186 | |
1187 | ifm = nlmsg_data(nlh); | |
51055be8 | 1188 | if (ifm->ifi_index > 0) { |
881d966b | 1189 | dev = dev_get_by_index(net, ifm->ifi_index); |
b60c5115 TG |
1190 | if (dev == NULL) |
1191 | return -ENODEV; | |
1192 | } else | |
711e2c33 | 1193 | return -EINVAL; |
711e2c33 | 1194 | |
38f7b870 | 1195 | nskb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL); |
b60c5115 TG |
1196 | if (nskb == NULL) { |
1197 | err = -ENOBUFS; | |
1198 | goto errout; | |
1199 | } | |
1200 | ||
575c3e2a PM |
1201 | err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).pid, |
1202 | nlh->nlmsg_seq, 0, 0); | |
26932566 PM |
1203 | if (err < 0) { |
1204 | /* -EMSGSIZE implies BUG in if_nlmsg_size */ | |
1205 | WARN_ON(err == -EMSGSIZE); | |
1206 | kfree_skb(nskb); | |
1207 | goto errout; | |
1208 | } | |
97c53cac | 1209 | err = rtnl_unicast(nskb, net, NETLINK_CB(skb).pid); |
b60c5115 | 1210 | errout: |
711e2c33 | 1211 | dev_put(dev); |
711e2c33 | 1212 | |
b60c5115 | 1213 | return err; |
711e2c33 | 1214 | } |
711e2c33 | 1215 | |
42bad1da | 1216 | static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb) |
1da177e4 | 1217 | { |
b854272b | 1218 | struct net *net = skb->sk->sk_net; |
1da177e4 LT |
1219 | int idx; |
1220 | int s_idx = cb->family; | |
1221 | ||
b854272b DL |
1222 | if (net != &init_net) |
1223 | return 0; | |
1224 | ||
1da177e4 LT |
1225 | if (s_idx == 0) |
1226 | s_idx = 1; | |
1227 | for (idx=1; idx<NPROTO; idx++) { | |
1228 | int type = cb->nlh->nlmsg_type-RTM_BASE; | |
1229 | if (idx < s_idx || idx == PF_PACKET) | |
1230 | continue; | |
e2849863 TG |
1231 | if (rtnl_msg_handlers[idx] == NULL || |
1232 | rtnl_msg_handlers[idx][type].dumpit == NULL) | |
1da177e4 LT |
1233 | continue; |
1234 | if (idx > s_idx) | |
1235 | memset(&cb->args[0], 0, sizeof(cb->args)); | |
e2849863 | 1236 | if (rtnl_msg_handlers[idx][type].dumpit(skb, cb)) |
1da177e4 LT |
1237 | break; |
1238 | } | |
1239 | cb->family = idx; | |
1240 | ||
1241 | return skb->len; | |
1242 | } | |
1243 | ||
1244 | void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change) | |
1245 | { | |
1246 | struct sk_buff *skb; | |
0ec6d3f4 | 1247 | int err = -ENOBUFS; |
1da177e4 | 1248 | |
38f7b870 | 1249 | skb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL); |
0ec6d3f4 TG |
1250 | if (skb == NULL) |
1251 | goto errout; | |
1da177e4 | 1252 | |
575c3e2a | 1253 | err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0); |
26932566 PM |
1254 | if (err < 0) { |
1255 | /* -EMSGSIZE implies BUG in if_nlmsg_size() */ | |
1256 | WARN_ON(err == -EMSGSIZE); | |
1257 | kfree_skb(skb); | |
1258 | goto errout; | |
1259 | } | |
97c53cac | 1260 | err = rtnl_notify(skb, &init_net, 0, RTNLGRP_LINK, NULL, GFP_KERNEL); |
0ec6d3f4 TG |
1261 | errout: |
1262 | if (err < 0) | |
97c53cac | 1263 | rtnl_set_sk_err(&init_net, RTNLGRP_LINK, err); |
1da177e4 LT |
1264 | } |
1265 | ||
1da177e4 LT |
1266 | /* Protected by RTNL sempahore. */ |
1267 | static struct rtattr **rta_buf; | |
1268 | static int rtattr_max; | |
1269 | ||
1270 | /* Process one rtnetlink message. */ | |
1271 | ||
1d00a4eb | 1272 | static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) |
1da177e4 | 1273 | { |
97c53cac | 1274 | struct net *net = skb->sk->sk_net; |
e2849863 | 1275 | rtnl_doit_func doit; |
1da177e4 LT |
1276 | int sz_idx, kind; |
1277 | int min_len; | |
1278 | int family; | |
1279 | int type; | |
1c2d670f | 1280 | int err; |
1da177e4 | 1281 | |
1da177e4 | 1282 | type = nlh->nlmsg_type; |
1da177e4 | 1283 | if (type > RTM_MAX) |
038890fe | 1284 | return -EOPNOTSUPP; |
1da177e4 LT |
1285 | |
1286 | type -= RTM_BASE; | |
1287 | ||
1288 | /* All the messages must have at least 1 byte length */ | |
1289 | if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg))) | |
1290 | return 0; | |
1291 | ||
1292 | family = ((struct rtgenmsg*)NLMSG_DATA(nlh))->rtgen_family; | |
1d00a4eb TG |
1293 | if (family >= NPROTO) |
1294 | return -EAFNOSUPPORT; | |
1da177e4 | 1295 | |
1da177e4 LT |
1296 | sz_idx = type>>2; |
1297 | kind = type&3; | |
1298 | ||
1d00a4eb TG |
1299 | if (kind != 2 && security_netlink_recv(skb, CAP_NET_ADMIN)) |
1300 | return -EPERM; | |
1da177e4 LT |
1301 | |
1302 | if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) { | |
97c53cac | 1303 | struct sock *rtnl; |
e2849863 | 1304 | rtnl_dumpit_func dumpit; |
1da177e4 | 1305 | |
e2849863 TG |
1306 | dumpit = rtnl_get_dumpit(family, type); |
1307 | if (dumpit == NULL) | |
038890fe | 1308 | return -EOPNOTSUPP; |
9ac4a169 | 1309 | |
1c2d670f | 1310 | __rtnl_unlock(); |
97c53cac | 1311 | rtnl = net->rtnl; |
1c2d670f PM |
1312 | err = netlink_dump_start(rtnl, skb, nlh, dumpit, NULL); |
1313 | rtnl_lock(); | |
1314 | return err; | |
1da177e4 LT |
1315 | } |
1316 | ||
1317 | memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *))); | |
1318 | ||
1319 | min_len = rtm_min[sz_idx]; | |
1320 | if (nlh->nlmsg_len < min_len) | |
1d00a4eb | 1321 | return -EINVAL; |
1da177e4 LT |
1322 | |
1323 | if (nlh->nlmsg_len > min_len) { | |
1324 | int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len); | |
1325 | struct rtattr *attr = (void*)nlh + NLMSG_ALIGN(min_len); | |
1326 | ||
1327 | while (RTA_OK(attr, attrlen)) { | |
1328 | unsigned flavor = attr->rta_type; | |
1329 | if (flavor) { | |
1330 | if (flavor > rta_max[sz_idx]) | |
1d00a4eb | 1331 | return -EINVAL; |
1da177e4 LT |
1332 | rta_buf[flavor-1] = attr; |
1333 | } | |
1334 | attr = RTA_NEXT(attr, attrlen); | |
1335 | } | |
1336 | } | |
1337 | ||
e2849863 TG |
1338 | doit = rtnl_get_doit(family, type); |
1339 | if (doit == NULL) | |
038890fe | 1340 | return -EOPNOTSUPP; |
1da177e4 | 1341 | |
1d00a4eb | 1342 | return doit(skb, nlh, (void *)&rta_buf[0]); |
1da177e4 LT |
1343 | } |
1344 | ||
cd40b7d3 | 1345 | static void rtnetlink_rcv(struct sk_buff *skb) |
1da177e4 | 1346 | { |
cd40b7d3 DL |
1347 | rtnl_lock(); |
1348 | netlink_rcv_skb(skb, &rtnetlink_rcv_msg); | |
1349 | rtnl_unlock(); | |
1da177e4 LT |
1350 | } |
1351 | ||
1da177e4 LT |
1352 | static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr) |
1353 | { | |
1354 | struct net_device *dev = ptr; | |
e9dc8653 EB |
1355 | |
1356 | if (dev->nd_net != &init_net) | |
1357 | return NOTIFY_DONE; | |
1358 | ||
1da177e4 LT |
1359 | switch (event) { |
1360 | case NETDEV_UNREGISTER: | |
1361 | rtmsg_ifinfo(RTM_DELLINK, dev, ~0U); | |
1362 | break; | |
1363 | case NETDEV_REGISTER: | |
1364 | rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U); | |
1365 | break; | |
1366 | case NETDEV_UP: | |
1367 | case NETDEV_DOWN: | |
1368 | rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING); | |
1369 | break; | |
1370 | case NETDEV_CHANGE: | |
1371 | case NETDEV_GOING_DOWN: | |
1372 | break; | |
1373 | default: | |
1374 | rtmsg_ifinfo(RTM_NEWLINK, dev, 0); | |
1375 | break; | |
1376 | } | |
1377 | return NOTIFY_DONE; | |
1378 | } | |
1379 | ||
1380 | static struct notifier_block rtnetlink_dev_notifier = { | |
1381 | .notifier_call = rtnetlink_event, | |
1382 | }; | |
1383 | ||
97c53cac DL |
1384 | |
1385 | static int rtnetlink_net_init(struct net *net) | |
1386 | { | |
1387 | struct sock *sk; | |
1388 | sk = netlink_kernel_create(net, NETLINK_ROUTE, RTNLGRP_MAX, | |
1389 | rtnetlink_rcv, &rtnl_mutex, THIS_MODULE); | |
1390 | if (!sk) | |
1391 | return -ENOMEM; | |
1392 | ||
1393 | /* Don't hold an extra reference on the namespace */ | |
1394 | put_net(sk->sk_net); | |
1395 | net->rtnl = sk; | |
1396 | return 0; | |
1397 | } | |
1398 | ||
1399 | static void rtnetlink_net_exit(struct net *net) | |
1400 | { | |
1401 | struct sock *sk = net->rtnl; | |
1402 | if (sk) { | |
1403 | /* At the last minute lie and say this is a socket for the | |
1404 | * initial network namespace. So the socket will be safe to | |
1405 | * free. | |
1406 | */ | |
1407 | sk->sk_net = get_net(&init_net); | |
1408 | sock_put(sk); | |
1409 | net->rtnl = NULL; | |
1410 | } | |
1411 | } | |
1412 | ||
1413 | static struct pernet_operations rtnetlink_net_ops = { | |
1414 | .init = rtnetlink_net_init, | |
1415 | .exit = rtnetlink_net_exit, | |
1416 | }; | |
1417 | ||
1da177e4 LT |
1418 | void __init rtnetlink_init(void) |
1419 | { | |
1420 | int i; | |
1421 | ||
1422 | rtattr_max = 0; | |
1423 | for (i = 0; i < ARRAY_SIZE(rta_max); i++) | |
1424 | if (rta_max[i] > rtattr_max) | |
1425 | rtattr_max = rta_max[i]; | |
1426 | rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL); | |
1427 | if (!rta_buf) | |
1428 | panic("rtnetlink_init: cannot allocate rta_buf\n"); | |
1429 | ||
97c53cac | 1430 | if (register_pernet_subsys(&rtnetlink_net_ops)) |
1da177e4 | 1431 | panic("rtnetlink_init: cannot initialize rtnetlink\n"); |
97c53cac | 1432 | |
1da177e4 LT |
1433 | netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV); |
1434 | register_netdevice_notifier(&rtnetlink_dev_notifier); | |
340d17fc TG |
1435 | |
1436 | rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink, rtnl_dump_ifinfo); | |
1437 | rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL); | |
38f7b870 PM |
1438 | rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL); |
1439 | rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL); | |
687ad8cc TG |
1440 | |
1441 | rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all); | |
1442 | rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all); | |
1da177e4 LT |
1443 | } |
1444 | ||
1445 | EXPORT_SYMBOL(__rta_fill); | |
1446 | EXPORT_SYMBOL(rtattr_strlcpy); | |
1447 | EXPORT_SYMBOL(rtattr_parse); | |
2371baa4 | 1448 | EXPORT_SYMBOL(__rtattr_parse_nested_compat); |
1da177e4 | 1449 | EXPORT_SYMBOL(rtnetlink_put_metrics); |
1da177e4 | 1450 | EXPORT_SYMBOL(rtnl_lock); |
6756ae4b | 1451 | EXPORT_SYMBOL(rtnl_trylock); |
1da177e4 | 1452 | EXPORT_SYMBOL(rtnl_unlock); |
2942e900 | 1453 | EXPORT_SYMBOL(rtnl_unicast); |
97676b6b TG |
1454 | EXPORT_SYMBOL(rtnl_notify); |
1455 | EXPORT_SYMBOL(rtnl_set_sk_err); | |
e7199288 PE |
1456 | EXPORT_SYMBOL(rtnl_create_link); |
1457 | EXPORT_SYMBOL(ifla_policy); |