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Merge branch 'upstream-davem' of master.kernel.org:/pub/scm/linux/kernel/git/jgarzik...
[linux-2.6-block.git] / net / core / rtnetlink.c
CommitLineData
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		 56struct rtnl_link
57{
58 rtnl_doit_func doit;
59 rtnl_dumpit_func dumpit;
60};
61
6756ae4b 62static DEFINE_MUTEX(rtnl_mutex);
1da177e4
LT		 63
64void rtnl_lock(void)
65{
6756ae4b 66 mutex_lock(&rtnl_mutex);
1da177e4
LT		 67}
68
6756ae4b 69void __rtnl_unlock(void)
1da177e4 70{
6756ae4b 71 mutex_unlock(&rtnl_mutex);
1da177e4 72}
6756ae4b 73
1da177e4
LT		 74void rtnl_unlock(void)
75{
6756ae4b 76 mutex_unlock(&rtnl_mutex);
1da177e4
LT		 77 netdev_run_todo();
78}
79
6756ae4b
SH		 80int rtnl_trylock(void)
81{
82 return mutex_trylock(&rtnl_mutex);
83}
84
42bad1da 85static struct rtnl_link *rtnl_msg_handlers[NPROTO];
e2849863
TG		 86
87static 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
101static 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
112static 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 */
140int __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
167EXPORT_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 */
178void 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
187EXPORT_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 */
196int 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
212EXPORT_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 */
221void 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
229EXPORT_SYMBOL_GPL(rtnl_unregister_all);
1da177e4 230
38f7b870
PM		 231static 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 */
243int __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
252EXPORT_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 */
260int 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
270EXPORT_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 */
278void __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 284restart:
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
295EXPORT_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 */
301void rtnl_link_unregister(struct rtnl_link_ops *ops)
302{
303 rtnl_lock();
304 __rtnl_link_unregister(ops);
305 rtnl_unlock();
306}
307
308EXPORT_SYMBOL_GPL(rtnl_link_unregister);
309
310static 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
321static 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
343static 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
373err_cancel_data:
374 nla_nest_cancel(skb, data);
375err_cancel_link:
376 nla_nest_cancel(skb, linkinfo);
377out:
378 return err;
379}
380
db46edc6 381static 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 395static 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
407void __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 419int 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 433int 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 440int 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 452void 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		 459int 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
482nla_put_failure:
483 return nla_nest_cancel(skb, mx);
1da177e4
LT		 484}
485
e3703b3d
TG		 486int 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
505EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo);
1da177e4 506
45b50354 507static 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		 538static 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 570static 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 589static 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
662nla_put_failure:
26932566
PM		 663 nlmsg_cancel(skb, nlh);
664 return -EMSGSIZE;
1da177e4
LT		 665}
666
b60c5115 667static 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		 682cont:
683 idx++;
1da177e4 684 }
1da177e4
LT		 685 cb->args[0] = idx;
686
687 return skb->len;
688}
689
e7199288 690const 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		 703static 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		 708static 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 727static 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 863errout:
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		 879static 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 920errout_dev:
1da177e4 921 dev_put(dev);
da5e0494 922errout:
1da177e4
LT		 923 return err;
924}
925
38f7b870
PM		 926static 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 962struct 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
999err_free:
1000 free_netdev(dev);
1001err:
1002 return ERR_PTR(err);
1003}
1004
38f7b870
PM		 1005static 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 1018replay:
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 1134static 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 1170errout:
711e2c33 1171 dev_put(dev);
711e2c33 1172
b60c5115 1173 return err;
711e2c33 1174}
711e2c33 1175
42bad1da 1176static 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
1200void 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		 1218errout:
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. */
1224static struct rtattr **rta_buf;
1225static int rtattr_max;
1226
1227/* Process one rtnetlink message. */
1228
1d00a4eb 1229static 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 1302static 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		 1309static 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
1334static struct notifier_block rtnetlink_dev_notifier = {
1335 .notifier_call = rtnetlink_event,
1336};
1337
97c53cac
DL		 1338
1339static 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
1350static void rtnetlink_net_exit(struct net *net)
1351{
775516bf
DL		 1352 netlink_kernel_release(net->rtnl);
1353 net->rtnl = NULL;
97c53cac
DL		 1354}
1355
1356static struct pernet_operations rtnetlink_net_ops = {
1357 .init = rtnetlink_net_init,
1358 .exit = rtnetlink_net_exit,
1359};
1360
1da177e4
LT		 1361void __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
1388EXPORT_SYMBOL(__rta_fill);
1da177e4 1389EXPORT_SYMBOL(rtnetlink_put_metrics);
1da177e4 1390EXPORT_SYMBOL(rtnl_lock);
6756ae4b 1391EXPORT_SYMBOL(rtnl_trylock);
1da177e4 1392EXPORT_SYMBOL(rtnl_unlock);
2942e900 1393EXPORT_SYMBOL(rtnl_unicast);
97676b6b
TG		 1394EXPORT_SYMBOL(rtnl_notify);
1395EXPORT_SYMBOL(rtnl_set_sk_err);
e7199288
PE		 1396EXPORT_SYMBOL(rtnl_create_link);
1397EXPORT_SYMBOL(ifla_policy);
Linux 6.x block layer and io_uring tree(s)