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dev: support deferring device flag change notifications
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / core / rtnetlink.c
blobc21ec4236dd03b9a86fc2b967d9a2c01455ddb6a
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
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>
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>
36 #include <linux/mutex.h>
37 #include <linux/if_addr.h>
38 #include <linux/pci.h>
39
40 #include <asm/uaccess.h>
41 #include <asm/system.h>
42
43 #include <linux/inet.h>
44 #include <linux/netdevice.h>
45 #include <net/ip.h>
46 #include <net/protocol.h>
47 #include <net/arp.h>
48 #include <net/route.h>
49 #include <net/udp.h>
50 #include <net/sock.h>
51 #include <net/pkt_sched.h>
52 #include <net/fib_rules.h>
53 #include <net/rtnetlink.h>
54 #include <net/net_namespace.h>
55
56 struct rtnl_link {
57 rtnl_doit_func doit;
58 rtnl_dumpit_func dumpit;
59 };
60
61 static DEFINE_MUTEX(rtnl_mutex);
62
63 void rtnl_lock(void)
64 {
65 mutex_lock(&rtnl_mutex);
66 }
67 EXPORT_SYMBOL(rtnl_lock);
68
69 void __rtnl_unlock(void)
70 {
71 mutex_unlock(&rtnl_mutex);
72 }
73
74 void rtnl_unlock(void)
75 {
76 /* This fellow will unlock it for us. */
77 netdev_run_todo();
78 }
79 EXPORT_SYMBOL(rtnl_unlock);
80
81 int rtnl_trylock(void)
82 {
83 return mutex_trylock(&rtnl_mutex);
84 }
85 EXPORT_SYMBOL(rtnl_trylock);
86
87 int rtnl_is_locked(void)
88 {
89 return mutex_is_locked(&rtnl_mutex);
90 }
91 EXPORT_SYMBOL(rtnl_is_locked);
92
93 static struct rtnl_link *rtnl_msg_handlers[NPROTO];
94
95 static inline int rtm_msgindex(int msgtype)
96 {
97 int msgindex = msgtype - RTM_BASE;
98
99 /*
100 * msgindex < 0 implies someone tried to register a netlink
101 * control code. msgindex >= RTM_NR_MSGTYPES may indicate that
102 * the message type has not been added to linux/rtnetlink.h
103 */
104 BUG_ON(msgindex < 0 || msgindex >= RTM_NR_MSGTYPES);
105
106 return msgindex;
107 }
108
109 static rtnl_doit_func rtnl_get_doit(int protocol, int msgindex)
110 {
111 struct rtnl_link *tab;
112
113 tab = rtnl_msg_handlers[protocol];
114 if (tab == NULL || tab[msgindex].doit == NULL)
115 tab = rtnl_msg_handlers[PF_UNSPEC];
116
117 return tab ? tab[msgindex].doit : NULL;
118 }
119
120 static rtnl_dumpit_func rtnl_get_dumpit(int protocol, int msgindex)
121 {
122 struct rtnl_link *tab;
123
124 tab = rtnl_msg_handlers[protocol];
125 if (tab == NULL || tab[msgindex].dumpit == NULL)
126 tab = rtnl_msg_handlers[PF_UNSPEC];
127
128 return tab ? tab[msgindex].dumpit : NULL;
129 }
130
131 /**
132 * __rtnl_register - Register a rtnetlink message type
133 * @protocol: Protocol family or PF_UNSPEC
134 * @msgtype: rtnetlink message type
135 * @doit: Function pointer called for each request message
136 * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message
137 *
138 * Registers the specified function pointers (at least one of them has
139 * to be non-NULL) to be called whenever a request message for the
140 * specified protocol family and message type is received.
141 *
142 * The special protocol family PF_UNSPEC may be used to define fallback
143 * function pointers for the case when no entry for the specific protocol
144 * family exists.
145 *
146 * Returns 0 on success or a negative error code.
147 */
148 int __rtnl_register(int protocol, int msgtype,
149 rtnl_doit_func doit, rtnl_dumpit_func dumpit)
150 {
151 struct rtnl_link *tab;
152 int msgindex;
153
154 BUG_ON(protocol < 0 || protocol >= NPROTO);
155 msgindex = rtm_msgindex(msgtype);
156
157 tab = rtnl_msg_handlers[protocol];
158 if (tab == NULL) {
159 tab = kcalloc(RTM_NR_MSGTYPES, sizeof(*tab), GFP_KERNEL);
160 if (tab == NULL)
161 return -ENOBUFS;
162
163 rtnl_msg_handlers[protocol] = tab;
164 }
165
166 if (doit)
167 tab[msgindex].doit = doit;
168
169 if (dumpit)
170 tab[msgindex].dumpit = dumpit;
171
172 return 0;
173 }
174 EXPORT_SYMBOL_GPL(__rtnl_register);
175
176 /**
177 * rtnl_register - Register a rtnetlink message type
178 *
179 * Identical to __rtnl_register() but panics on failure. This is useful
180 * as failure of this function is very unlikely, it can only happen due
181 * to lack of memory when allocating the chain to store all message
182 * handlers for a protocol. Meant for use in init functions where lack
183 * of memory implies no sense in continueing.
184 */
185 void rtnl_register(int protocol, int msgtype,
186 rtnl_doit_func doit, rtnl_dumpit_func dumpit)
187 {
188 if (__rtnl_register(protocol, msgtype, doit, dumpit) < 0)
189 panic("Unable to register rtnetlink message handler, "
190 "protocol = %d, message type = %d\n",
191 protocol, msgtype);
192 }
193 EXPORT_SYMBOL_GPL(rtnl_register);
194
195 /**
196 * rtnl_unregister - Unregister a rtnetlink message type
197 * @protocol: Protocol family or PF_UNSPEC
198 * @msgtype: rtnetlink message type
199 *
200 * Returns 0 on success or a negative error code.
201 */
202 int rtnl_unregister(int protocol, int msgtype)
203 {
204 int msgindex;
205
206 BUG_ON(protocol < 0 || protocol >= NPROTO);
207 msgindex = rtm_msgindex(msgtype);
208
209 if (rtnl_msg_handlers[protocol] == NULL)
210 return -ENOENT;
211
212 rtnl_msg_handlers[protocol][msgindex].doit = NULL;
213 rtnl_msg_handlers[protocol][msgindex].dumpit = NULL;
214
215 return 0;
216 }
217 EXPORT_SYMBOL_GPL(rtnl_unregister);
218
219 /**
220 * rtnl_unregister_all - Unregister all rtnetlink message type of a protocol
221 * @protocol : Protocol family or PF_UNSPEC
222 *
223 * Identical to calling rtnl_unregster() for all registered message types
224 * of a certain protocol family.
225 */
226 void rtnl_unregister_all(int protocol)
227 {
228 BUG_ON(protocol < 0 || protocol >= NPROTO);
229
230 kfree(rtnl_msg_handlers[protocol]);
231 rtnl_msg_handlers[protocol] = NULL;
232 }
233 EXPORT_SYMBOL_GPL(rtnl_unregister_all);
234
235 static LIST_HEAD(link_ops);
236
237 /**
238 * __rtnl_link_register - Register rtnl_link_ops with rtnetlink.
239 * @ops: struct rtnl_link_ops * to register
240 *
241 * The caller must hold the rtnl_mutex. This function should be used
242 * by drivers that create devices during module initialization. It
243 * must be called before registering the devices.
244 *
245 * Returns 0 on success or a negative error code.
246 */
247 int __rtnl_link_register(struct rtnl_link_ops *ops)
248 {
249 if (!ops->dellink)
250 ops->dellink = unregister_netdevice_queue;
251
252 list_add_tail(&ops->list, &link_ops);
253 return 0;
254 }
255 EXPORT_SYMBOL_GPL(__rtnl_link_register);
256
257 /**
258 * rtnl_link_register - Register rtnl_link_ops with rtnetlink.
259 * @ops: struct rtnl_link_ops * to register
260 *
261 * Returns 0 on success or a negative error code.
262 */
263 int rtnl_link_register(struct rtnl_link_ops *ops)
264 {
265 int err;
266
267 rtnl_lock();
268 err = __rtnl_link_register(ops);
269 rtnl_unlock();
270 return err;
271 }
272 EXPORT_SYMBOL_GPL(rtnl_link_register);
273
274 static void __rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops)
275 {
276 struct net_device *dev;
277 LIST_HEAD(list_kill);
278
279 for_each_netdev(net, dev) {
280 if (dev->rtnl_link_ops == ops)
281 ops->dellink(dev, &list_kill);
282 }
283 unregister_netdevice_many(&list_kill);
284 }
285
286 void rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops)
287 {
288 rtnl_lock();
289 __rtnl_kill_links(net, ops);
290 rtnl_unlock();
291 }
292 EXPORT_SYMBOL_GPL(rtnl_kill_links);
293
294 /**
295 * __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
296 * @ops: struct rtnl_link_ops * to unregister
297 *
298 * The caller must hold the rtnl_mutex.
299 */
300 void __rtnl_link_unregister(struct rtnl_link_ops *ops)
301 {
302 struct net *net;
303
304 for_each_net(net) {
305 __rtnl_kill_links(net, ops);
306 }
307 list_del(&ops->list);
308 }
309 EXPORT_SYMBOL_GPL(__rtnl_link_unregister);
310
311 /**
312 * rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
313 * @ops: struct rtnl_link_ops * to unregister
314 */
315 void rtnl_link_unregister(struct rtnl_link_ops *ops)
316 {
317 rtnl_lock();
318 __rtnl_link_unregister(ops);
319 rtnl_unlock();
320 }
321 EXPORT_SYMBOL_GPL(rtnl_link_unregister);
322
323 static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind)
324 {
325 const struct rtnl_link_ops *ops;
326
327 list_for_each_entry(ops, &link_ops, list) {
328 if (!strcmp(ops->kind, kind))
329 return ops;
330 }
331 return NULL;
332 }
333
334 static size_t rtnl_link_get_size(const struct net_device *dev)
335 {
336 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
337 size_t size;
338
339 if (!ops)
340 return 0;
341
342 size = nlmsg_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */
343 nlmsg_total_size(strlen(ops->kind) + 1); /* IFLA_INFO_KIND */
344
345 if (ops->get_size)
346 /* IFLA_INFO_DATA + nested data */
347 size += nlmsg_total_size(sizeof(struct nlattr)) +
348 ops->get_size(dev);
349
350 if (ops->get_xstats_size)
351 size += ops->get_xstats_size(dev); /* IFLA_INFO_XSTATS */
352
353 return size;
354 }
355
356 static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev)
357 {
358 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
359 struct nlattr *linkinfo, *data;
360 int err = -EMSGSIZE;
361
362 linkinfo = nla_nest_start(skb, IFLA_LINKINFO);
363 if (linkinfo == NULL)
364 goto out;
365
366 if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0)
367 goto err_cancel_link;
368 if (ops->fill_xstats) {
369 err = ops->fill_xstats(skb, dev);
370 if (err < 0)
371 goto err_cancel_link;
372 }
373 if (ops->fill_info) {
374 data = nla_nest_start(skb, IFLA_INFO_DATA);
375 if (data == NULL)
376 goto err_cancel_link;
377 err = ops->fill_info(skb, dev);
378 if (err < 0)
379 goto err_cancel_data;
380 nla_nest_end(skb, data);
381 }
382
383 nla_nest_end(skb, linkinfo);
384 return 0;
385
386 err_cancel_data:
387 nla_nest_cancel(skb, data);
388 err_cancel_link:
389 nla_nest_cancel(skb, linkinfo);
390 out:
391 return err;
392 }
393
394 static const int rtm_min[RTM_NR_FAMILIES] =
395 {
396 [RTM_FAM(RTM_NEWLINK)] = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
397 [RTM_FAM(RTM_NEWADDR)] = NLMSG_LENGTH(sizeof(struct ifaddrmsg)),
398 [RTM_FAM(RTM_NEWROUTE)] = NLMSG_LENGTH(sizeof(struct rtmsg)),
399 [RTM_FAM(RTM_NEWRULE)] = NLMSG_LENGTH(sizeof(struct fib_rule_hdr)),
400 [RTM_FAM(RTM_NEWQDISC)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
401 [RTM_FAM(RTM_NEWTCLASS)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
402 [RTM_FAM(RTM_NEWTFILTER)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
403 [RTM_FAM(RTM_NEWACTION)] = NLMSG_LENGTH(sizeof(struct tcamsg)),
404 [RTM_FAM(RTM_GETMULTICAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
405 [RTM_FAM(RTM_GETANYCAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
406 };
407
408 static const int rta_max[RTM_NR_FAMILIES] =
409 {
410 [RTM_FAM(RTM_NEWLINK)] = IFLA_MAX,
411 [RTM_FAM(RTM_NEWADDR)] = IFA_MAX,
412 [RTM_FAM(RTM_NEWROUTE)] = RTA_MAX,
413 [RTM_FAM(RTM_NEWRULE)] = FRA_MAX,
414 [RTM_FAM(RTM_NEWQDISC)] = TCA_MAX,
415 [RTM_FAM(RTM_NEWTCLASS)] = TCA_MAX,
416 [RTM_FAM(RTM_NEWTFILTER)] = TCA_MAX,
417 [RTM_FAM(RTM_NEWACTION)] = TCAA_MAX,
418 };
419
420 void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const void *data)
421 {
422 struct rtattr *rta;
423 int size = RTA_LENGTH(attrlen);
424
425 rta = (struct rtattr *)skb_put(skb, RTA_ALIGN(size));
426 rta->rta_type = attrtype;
427 rta->rta_len = size;
428 memcpy(RTA_DATA(rta), data, attrlen);
429 memset(RTA_DATA(rta) + attrlen, 0, RTA_ALIGN(size) - size);
430 }
431 EXPORT_SYMBOL(__rta_fill);
432
433 int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned group, int echo)
434 {
435 struct sock *rtnl = net->rtnl;
436 int err = 0;
437
438 NETLINK_CB(skb).dst_group = group;
439 if (echo)
440 atomic_inc(&skb->users);
441 netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL);
442 if (echo)
443 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
444 return err;
445 }
446
447 int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid)
448 {
449 struct sock *rtnl = net->rtnl;
450
451 return nlmsg_unicast(rtnl, skb, pid);
452 }
453 EXPORT_SYMBOL(rtnl_unicast);
454
455 void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group,
456 struct nlmsghdr *nlh, gfp_t flags)
457 {
458 struct sock *rtnl = net->rtnl;
459 int report = 0;
460
461 if (nlh)
462 report = nlmsg_report(nlh);
463
464 nlmsg_notify(rtnl, skb, pid, group, report, flags);
465 }
466 EXPORT_SYMBOL(rtnl_notify);
467
468 void rtnl_set_sk_err(struct net *net, u32 group, int error)
469 {
470 struct sock *rtnl = net->rtnl;
471
472 netlink_set_err(rtnl, 0, group, error);
473 }
474 EXPORT_SYMBOL(rtnl_set_sk_err);
475
476 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics)
477 {
478 struct nlattr *mx;
479 int i, valid = 0;
480
481 mx = nla_nest_start(skb, RTA_METRICS);
482 if (mx == NULL)
483 return -ENOBUFS;
484
485 for (i = 0; i < RTAX_MAX; i++) {
486 if (metrics[i]) {
487 valid++;
488 NLA_PUT_U32(skb, i+1, metrics[i]);
489 }
490 }
491
492 if (!valid) {
493 nla_nest_cancel(skb, mx);
494 return 0;
495 }
496
497 return nla_nest_end(skb, mx);
498
499 nla_put_failure:
500 nla_nest_cancel(skb, mx);
501 return -EMSGSIZE;
502 }
503 EXPORT_SYMBOL(rtnetlink_put_metrics);
504
505 int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id,
506 u32 ts, u32 tsage, long expires, u32 error)
507 {
508 struct rta_cacheinfo ci = {
509 .rta_lastuse = jiffies_to_clock_t(jiffies - dst->lastuse),
510 .rta_used = dst->__use,
511 .rta_clntref = atomic_read(&(dst->__refcnt)),
512 .rta_error = error,
513 .rta_id = id,
514 .rta_ts = ts,
515 .rta_tsage = tsage,
516 };
517
518 if (expires)
519 ci.rta_expires = jiffies_to_clock_t(expires);
520
521 return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci);
522 }
523 EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo);
524
525 static void set_operstate(struct net_device *dev, unsigned char transition)
526 {
527 unsigned char operstate = dev->operstate;
528
529 switch (transition) {
530 case IF_OPER_UP:
531 if ((operstate == IF_OPER_DORMANT ||
532 operstate == IF_OPER_UNKNOWN) &&
533 !netif_dormant(dev))
534 operstate = IF_OPER_UP;
535 break;
536
537 case IF_OPER_DORMANT:
538 if (operstate == IF_OPER_UP ||
539 operstate == IF_OPER_UNKNOWN)
540 operstate = IF_OPER_DORMANT;
541 break;
542 }
543
544 if (dev->operstate != operstate) {
545 write_lock_bh(&dev_base_lock);
546 dev->operstate = operstate;
547 write_unlock_bh(&dev_base_lock);
548 netdev_state_change(dev);
549 }
550 }
551
552 static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
553 const struct net_device_stats *b)
554 {
555 a->rx_packets = b->rx_packets;
556 a->tx_packets = b->tx_packets;
557 a->rx_bytes = b->rx_bytes;
558 a->tx_bytes = b->tx_bytes;
559 a->rx_errors = b->rx_errors;
560 a->tx_errors = b->tx_errors;
561 a->rx_dropped = b->rx_dropped;
562 a->tx_dropped = b->tx_dropped;
563
564 a->multicast = b->multicast;
565 a->collisions = b->collisions;
566
567 a->rx_length_errors = b->rx_length_errors;
568 a->rx_over_errors = b->rx_over_errors;
569 a->rx_crc_errors = b->rx_crc_errors;
570 a->rx_frame_errors = b->rx_frame_errors;
571 a->rx_fifo_errors = b->rx_fifo_errors;
572 a->rx_missed_errors = b->rx_missed_errors;
573
574 a->tx_aborted_errors = b->tx_aborted_errors;
575 a->tx_carrier_errors = b->tx_carrier_errors;
576 a->tx_fifo_errors = b->tx_fifo_errors;
577 a->tx_heartbeat_errors = b->tx_heartbeat_errors;
578 a->tx_window_errors = b->tx_window_errors;
579
580 a->rx_compressed = b->rx_compressed;
581 a->tx_compressed = b->tx_compressed;
582 };
583
584 static inline int rtnl_vfinfo_size(const struct net_device *dev)
585 {
586 if (dev->dev.parent && dev_is_pci(dev->dev.parent))
587 return dev_num_vf(dev->dev.parent) *
588 sizeof(struct ifla_vf_info);
589 else
590 return 0;
591 }
592
593 static inline size_t if_nlmsg_size(const struct net_device *dev)
594 {
595 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
596 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
597 + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */
598 + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */
599 + nla_total_size(sizeof(struct rtnl_link_ifmap))
600 + nla_total_size(sizeof(struct rtnl_link_stats))
601 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
602 + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */
603 + nla_total_size(4) /* IFLA_TXQLEN */
604 + nla_total_size(4) /* IFLA_WEIGHT */
605 + nla_total_size(4) /* IFLA_MTU */
606 + nla_total_size(4) /* IFLA_LINK */
607 + nla_total_size(4) /* IFLA_MASTER */
608 + nla_total_size(1) /* IFLA_OPERSTATE */
609 + nla_total_size(1) /* IFLA_LINKMODE */
610 + nla_total_size(4) /* IFLA_NUM_VF */
611 + nla_total_size(rtnl_vfinfo_size(dev)) /* IFLA_VFINFO */
612 + rtnl_link_get_size(dev); /* IFLA_LINKINFO */
613 }
614
615 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
616 int type, u32 pid, u32 seq, u32 change,
617 unsigned int flags)
618 {
619 struct ifinfomsg *ifm;
620 struct nlmsghdr *nlh;
621 const struct net_device_stats *stats;
622 struct nlattr *attr;
623
624 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
625 if (nlh == NULL)
626 return -EMSGSIZE;
627
628 ifm = nlmsg_data(nlh);
629 ifm->ifi_family = AF_UNSPEC;
630 ifm->__ifi_pad = 0;
631 ifm->ifi_type = dev->type;
632 ifm->ifi_index = dev->ifindex;
633 ifm->ifi_flags = dev_get_flags(dev);
634 ifm->ifi_change = change;
635
636 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
637 NLA_PUT_U32(skb, IFLA_TXQLEN, dev->tx_queue_len);
638 NLA_PUT_U8(skb, IFLA_OPERSTATE,
639 netif_running(dev) ? dev->operstate : IF_OPER_DOWN);
640 NLA_PUT_U8(skb, IFLA_LINKMODE, dev->link_mode);
641 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
642
643 if (dev->ifindex != dev->iflink)
644 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
645
646 if (dev->master)
647 NLA_PUT_U32(skb, IFLA_MASTER, dev->master->ifindex);
648
649 if (dev->qdisc)
650 NLA_PUT_STRING(skb, IFLA_QDISC, dev->qdisc->ops->id);
651
652 if (dev->ifalias)
653 NLA_PUT_STRING(skb, IFLA_IFALIAS, dev->ifalias);
654
655 if (1) {
656 struct rtnl_link_ifmap map = {
657 .mem_start = dev->mem_start,
658 .mem_end = dev->mem_end,
659 .base_addr = dev->base_addr,
660 .irq = dev->irq,
661 .dma = dev->dma,
662 .port = dev->if_port,
663 };
664 NLA_PUT(skb, IFLA_MAP, sizeof(map), &map);
665 }
666
667 if (dev->addr_len) {
668 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
669 NLA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast);
670 }
671
672 attr = nla_reserve(skb, IFLA_STATS,
673 sizeof(struct rtnl_link_stats));
674 if (attr == NULL)
675 goto nla_put_failure;
676
677 stats = dev_get_stats(dev);
678 copy_rtnl_link_stats(nla_data(attr), stats);
679
680 if (dev->netdev_ops->ndo_get_vf_config && dev->dev.parent) {
681 int i;
682 struct ifla_vf_info ivi;
683
684 NLA_PUT_U32(skb, IFLA_NUM_VF, dev_num_vf(dev->dev.parent));
685 for (i = 0; i < dev_num_vf(dev->dev.parent); i++) {
686 if (dev->netdev_ops->ndo_get_vf_config(dev, i, &ivi))
687 break;
688 NLA_PUT(skb, IFLA_VFINFO, sizeof(ivi), &ivi);
689 }
690 }
691 if (dev->rtnl_link_ops) {
692 if (rtnl_link_fill(skb, dev) < 0)
693 goto nla_put_failure;
694 }
695
696 return nlmsg_end(skb, nlh);
697
698 nla_put_failure:
699 nlmsg_cancel(skb, nlh);
700 return -EMSGSIZE;
701 }
702
703 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
704 {
705 struct net *net = sock_net(skb->sk);
706 int h, s_h;
707 int idx = 0, s_idx;
708 struct net_device *dev;
709 struct hlist_head *head;
710 struct hlist_node *node;
711
712 s_h = cb->args[0];
713 s_idx = cb->args[1];
714
715 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
716 idx = 0;
717 head = &net->dev_index_head[h];
718 hlist_for_each_entry(dev, node, head, index_hlist) {
719 if (idx < s_idx)
720 goto cont;
721 if (rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK,
722 NETLINK_CB(cb->skb).pid,
723 cb->nlh->nlmsg_seq, 0,
724 NLM_F_MULTI) <= 0)
725 goto out;
726 cont:
727 idx++;
728 }
729 }
730 out:
731 cb->args[1] = idx;
732 cb->args[0] = h;
733
734 return skb->len;
735 }
736
737 const struct nla_policy ifla_policy[IFLA_MAX+1] = {
738 [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 },
739 [IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
740 [IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
741 [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) },
742 [IFLA_MTU] = { .type = NLA_U32 },
743 [IFLA_LINK] = { .type = NLA_U32 },
744 [IFLA_TXQLEN] = { .type = NLA_U32 },
745 [IFLA_WEIGHT] = { .type = NLA_U32 },
746 [IFLA_OPERSTATE] = { .type = NLA_U8 },
747 [IFLA_LINKMODE] = { .type = NLA_U8 },
748 [IFLA_LINKINFO] = { .type = NLA_NESTED },
749 [IFLA_NET_NS_PID] = { .type = NLA_U32 },
750 [IFLA_IFALIAS] = { .type = NLA_STRING, .len = IFALIASZ-1 },
751 [IFLA_VF_MAC] = { .type = NLA_BINARY,
752 .len = sizeof(struct ifla_vf_mac) },
753 [IFLA_VF_VLAN] = { .type = NLA_BINARY,
754 .len = sizeof(struct ifla_vf_vlan) },
755 [IFLA_VF_TX_RATE] = { .type = NLA_BINARY,
756 .len = sizeof(struct ifla_vf_tx_rate) },
757 };
758 EXPORT_SYMBOL(ifla_policy);
759
760 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
761 [IFLA_INFO_KIND] = { .type = NLA_STRING },
762 [IFLA_INFO_DATA] = { .type = NLA_NESTED },
763 };
764
765 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[])
766 {
767 struct net *net;
768 /* Examine the link attributes and figure out which
769 * network namespace we are talking about.
770 */
771 if (tb[IFLA_NET_NS_PID])
772 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID]));
773 else
774 net = get_net(src_net);
775 return net;
776 }
777 EXPORT_SYMBOL(rtnl_link_get_net);
778
779 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[])
780 {
781 if (dev) {
782 if (tb[IFLA_ADDRESS] &&
783 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
784 return -EINVAL;
785
786 if (tb[IFLA_BROADCAST] &&
787 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
788 return -EINVAL;
789 }
790
791 return 0;
792 }
793
794 static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm,
795 struct nlattr **tb, char *ifname, int modified)
796 {
797 const struct net_device_ops *ops = dev->netdev_ops;
798 int send_addr_notify = 0;
799 int err;
800
801 if (tb[IFLA_NET_NS_PID]) {
802 struct net *net = rtnl_link_get_net(dev_net(dev), tb);
803 if (IS_ERR(net)) {
804 err = PTR_ERR(net);
805 goto errout;
806 }
807 err = dev_change_net_namespace(dev, net, ifname);
808 put_net(net);
809 if (err)
810 goto errout;
811 modified = 1;
812 }
813
814 if (tb[IFLA_MAP]) {
815 struct rtnl_link_ifmap *u_map;
816 struct ifmap k_map;
817
818 if (!ops->ndo_set_config) {
819 err = -EOPNOTSUPP;
820 goto errout;
821 }
822
823 if (!netif_device_present(dev)) {
824 err = -ENODEV;
825 goto errout;
826 }
827
828 u_map = nla_data(tb[IFLA_MAP]);
829 k_map.mem_start = (unsigned long) u_map->mem_start;
830 k_map.mem_end = (unsigned long) u_map->mem_end;
831 k_map.base_addr = (unsigned short) u_map->base_addr;
832 k_map.irq = (unsigned char) u_map->irq;
833 k_map.dma = (unsigned char) u_map->dma;
834 k_map.port = (unsigned char) u_map->port;
835
836 err = ops->ndo_set_config(dev, &k_map);
837 if (err < 0)
838 goto errout;
839
840 modified = 1;
841 }
842
843 if (tb[IFLA_ADDRESS]) {
844 struct sockaddr *sa;
845 int len;
846
847 if (!ops->ndo_set_mac_address) {
848 err = -EOPNOTSUPP;
849 goto errout;
850 }
851
852 if (!netif_device_present(dev)) {
853 err = -ENODEV;
854 goto errout;
855 }
856
857 len = sizeof(sa_family_t) + dev->addr_len;
858 sa = kmalloc(len, GFP_KERNEL);
859 if (!sa) {
860 err = -ENOMEM;
861 goto errout;
862 }
863 sa->sa_family = dev->type;
864 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
865 dev->addr_len);
866 err = ops->ndo_set_mac_address(dev, sa);
867 kfree(sa);
868 if (err)
869 goto errout;
870 send_addr_notify = 1;
871 modified = 1;
872 }
873
874 if (tb[IFLA_MTU]) {
875 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
876 if (err < 0)
877 goto errout;
878 modified = 1;
879 }
880
881 /*
882 * Interface selected by interface index but interface
883 * name provided implies that a name change has been
884 * requested.
885 */
886 if (ifm->ifi_index > 0 && ifname[0]) {
887 err = dev_change_name(dev, ifname);
888 if (err < 0)
889 goto errout;
890 modified = 1;
891 }
892
893 if (tb[IFLA_IFALIAS]) {
894 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]),
895 nla_len(tb[IFLA_IFALIAS]));
896 if (err < 0)
897 goto errout;
898 modified = 1;
899 }
900
901 if (tb[IFLA_BROADCAST]) {
902 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
903 send_addr_notify = 1;
904 }
905
906 if (ifm->ifi_flags || ifm->ifi_change) {
907 unsigned int flags = ifm->ifi_flags;
908
909 /* bugwards compatibility: ifi_change == 0 is treated as ~0 */
910 if (ifm->ifi_change)
911 flags = (flags & ifm->ifi_change) |
912 (dev->flags & ~ifm->ifi_change);
913 err = dev_change_flags(dev, flags);
914 if (err < 0)
915 goto errout;
916 }
917
918 if (tb[IFLA_TXQLEN])
919 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
920
921 if (tb[IFLA_OPERSTATE])
922 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
923
924 if (tb[IFLA_LINKMODE]) {
925 write_lock_bh(&dev_base_lock);
926 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
927 write_unlock_bh(&dev_base_lock);
928 }
929
930 if (tb[IFLA_VF_MAC]) {
931 struct ifla_vf_mac *ivm;
932 ivm = nla_data(tb[IFLA_VF_MAC]);
933 err = -EOPNOTSUPP;
934 if (ops->ndo_set_vf_mac)
935 err = ops->ndo_set_vf_mac(dev, ivm->vf, ivm->mac);
936 if (err < 0)
937 goto errout;
938 modified = 1;
939 }
940
941 if (tb[IFLA_VF_VLAN]) {
942 struct ifla_vf_vlan *ivv;
943 ivv = nla_data(tb[IFLA_VF_VLAN]);
944 err = -EOPNOTSUPP;
945 if (ops->ndo_set_vf_vlan)
946 err = ops->ndo_set_vf_vlan(dev, ivv->vf,
947 ivv->vlan,
948 ivv->qos);
949 if (err < 0)
950 goto errout;
951 modified = 1;
952 }
953 err = 0;
954
955 if (tb[IFLA_VF_TX_RATE]) {
956 struct ifla_vf_tx_rate *ivt;
957 ivt = nla_data(tb[IFLA_VF_TX_RATE]);
958 err = -EOPNOTSUPP;
959 if (ops->ndo_set_vf_tx_rate)
960 err = ops->ndo_set_vf_tx_rate(dev, ivt->vf, ivt->rate);
961 if (err < 0)
962 goto errout;
963 modified = 1;
964 }
965 err = 0;
966
967 errout:
968 if (err < 0 && modified && net_ratelimit())
969 printk(KERN_WARNING "A link change request failed with "
970 "some changes comitted already. Interface %s may "
971 "have been left with an inconsistent configuration, "
972 "please check.\n", dev->name);
973
974 if (send_addr_notify)
975 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
976 return err;
977 }
978
979 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
980 {
981 struct net *net = sock_net(skb->sk);
982 struct ifinfomsg *ifm;
983 struct net_device *dev;
984 int err;
985 struct nlattr *tb[IFLA_MAX+1];
986 char ifname[IFNAMSIZ];
987
988 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
989 if (err < 0)
990 goto errout;
991
992 if (tb[IFLA_IFNAME])
993 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
994 else
995 ifname[0] = '\0';
996
997 err = -EINVAL;
998 ifm = nlmsg_data(nlh);
999 if (ifm->ifi_index > 0)
1000 dev = __dev_get_by_index(net, ifm->ifi_index);
1001 else if (tb[IFLA_IFNAME])
1002 dev = __dev_get_by_name(net, ifname);
1003 else
1004 goto errout;
1005
1006 if (dev == NULL) {
1007 err = -ENODEV;
1008 goto errout;
1009 }
1010
1011 err = validate_linkmsg(dev, tb);
1012 if (err < 0)
1013 goto errout;
1014
1015 err = do_setlink(dev, ifm, tb, ifname, 0);
1016 errout:
1017 return err;
1018 }
1019
1020 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
1021 {
1022 struct net *net = sock_net(skb->sk);
1023 const struct rtnl_link_ops *ops;
1024 struct net_device *dev;
1025 struct ifinfomsg *ifm;
1026 char ifname[IFNAMSIZ];
1027 struct nlattr *tb[IFLA_MAX+1];
1028 int err;
1029
1030 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1031 if (err < 0)
1032 return err;
1033
1034 if (tb[IFLA_IFNAME])
1035 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1036
1037 ifm = nlmsg_data(nlh);
1038 if (ifm->ifi_index > 0)
1039 dev = __dev_get_by_index(net, ifm->ifi_index);
1040 else if (tb[IFLA_IFNAME])
1041 dev = __dev_get_by_name(net, ifname);
1042 else
1043 return -EINVAL;
1044
1045 if (!dev)
1046 return -ENODEV;
1047
1048 ops = dev->rtnl_link_ops;
1049 if (!ops)
1050 return -EOPNOTSUPP;
1051
1052 ops->dellink(dev, NULL);
1053 return 0;
1054 }
1055
1056 struct net_device *rtnl_create_link(struct net *src_net, struct net *net,
1057 char *ifname, const struct rtnl_link_ops *ops, struct nlattr *tb[])
1058 {
1059 int err;
1060 struct net_device *dev;
1061 unsigned int num_queues = 1;
1062 unsigned int real_num_queues = 1;
1063
1064 if (ops->get_tx_queues) {
1065 err = ops->get_tx_queues(src_net, tb, &num_queues,
1066 &real_num_queues);
1067 if (err)
1068 goto err;
1069 }
1070 err = -ENOMEM;
1071 dev = alloc_netdev_mq(ops->priv_size, ifname, ops->setup, num_queues);
1072 if (!dev)
1073 goto err;
1074
1075 dev_net_set(dev, net);
1076 dev->rtnl_link_ops = ops;
1077 dev->real_num_tx_queues = real_num_queues;
1078
1079 if (strchr(dev->name, '%')) {
1080 err = dev_alloc_name(dev, dev->name);
1081 if (err < 0)
1082 goto err_free;
1083 }
1084
1085 if (tb[IFLA_MTU])
1086 dev->mtu = nla_get_u32(tb[IFLA_MTU]);
1087 if (tb[IFLA_ADDRESS])
1088 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]),
1089 nla_len(tb[IFLA_ADDRESS]));
1090 if (tb[IFLA_BROADCAST])
1091 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]),
1092 nla_len(tb[IFLA_BROADCAST]));
1093 if (tb[IFLA_TXQLEN])
1094 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
1095 if (tb[IFLA_OPERSTATE])
1096 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
1097 if (tb[IFLA_LINKMODE])
1098 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
1099
1100 return dev;
1101
1102 err_free:
1103 free_netdev(dev);
1104 err:
1105 return ERR_PTR(err);
1106 }
1107 EXPORT_SYMBOL(rtnl_create_link);
1108
1109 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
1110 {
1111 struct net *net = sock_net(skb->sk);
1112 const struct rtnl_link_ops *ops;
1113 struct net_device *dev;
1114 struct ifinfomsg *ifm;
1115 char kind[MODULE_NAME_LEN];
1116 char ifname[IFNAMSIZ];
1117 struct nlattr *tb[IFLA_MAX+1];
1118 struct nlattr *linkinfo[IFLA_INFO_MAX+1];
1119 int err;
1120
1121 #ifdef CONFIG_MODULES
1122 replay:
1123 #endif
1124 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1125 if (err < 0)
1126 return err;
1127
1128 if (tb[IFLA_IFNAME])
1129 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1130 else
1131 ifname[0] = '\0';
1132
1133 ifm = nlmsg_data(nlh);
1134 if (ifm->ifi_index > 0)
1135 dev = __dev_get_by_index(net, ifm->ifi_index);
1136 else if (ifname[0])
1137 dev = __dev_get_by_name(net, ifname);
1138 else
1139 dev = NULL;
1140
1141 err = validate_linkmsg(dev, tb);
1142 if (err < 0)
1143 return err;
1144
1145 if (tb[IFLA_LINKINFO]) {
1146 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX,
1147 tb[IFLA_LINKINFO], ifla_info_policy);
1148 if (err < 0)
1149 return err;
1150 } else
1151 memset(linkinfo, 0, sizeof(linkinfo));
1152
1153 if (linkinfo[IFLA_INFO_KIND]) {
1154 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind));
1155 ops = rtnl_link_ops_get(kind);
1156 } else {
1157 kind[0] = '\0';
1158 ops = NULL;
1159 }
1160
1161 if (1) {
1162 struct nlattr *attr[ops ? ops->maxtype + 1 : 0], **data = NULL;
1163 struct net *dest_net;
1164
1165 if (ops) {
1166 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
1167 err = nla_parse_nested(attr, ops->maxtype,
1168 linkinfo[IFLA_INFO_DATA],
1169 ops->policy);
1170 if (err < 0)
1171 return err;
1172 data = attr;
1173 }
1174 if (ops->validate) {
1175 err = ops->validate(tb, data);
1176 if (err < 0)
1177 return err;
1178 }
1179 }
1180
1181 if (dev) {
1182 int modified = 0;
1183
1184 if (nlh->nlmsg_flags & NLM_F_EXCL)
1185 return -EEXIST;
1186 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1187 return -EOPNOTSUPP;
1188
1189 if (linkinfo[IFLA_INFO_DATA]) {
1190 if (!ops || ops != dev->rtnl_link_ops ||
1191 !ops->changelink)
1192 return -EOPNOTSUPP;
1193
1194 err = ops->changelink(dev, tb, data);
1195 if (err < 0)
1196 return err;
1197 modified = 1;
1198 }
1199
1200 return do_setlink(dev, ifm, tb, ifname, modified);
1201 }
1202
1203 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
1204 return -ENODEV;
1205
1206 if (ifm->ifi_index || ifm->ifi_flags || ifm->ifi_change)
1207 return -EOPNOTSUPP;
1208 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO])
1209 return -EOPNOTSUPP;
1210
1211 if (!ops) {
1212 #ifdef CONFIG_MODULES
1213 if (kind[0]) {
1214 __rtnl_unlock();
1215 request_module("rtnl-link-%s", kind);
1216 rtnl_lock();
1217 ops = rtnl_link_ops_get(kind);
1218 if (ops)
1219 goto replay;
1220 }
1221 #endif
1222 return -EOPNOTSUPP;
1223 }
1224
1225 if (!ifname[0])
1226 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
1227
1228 dest_net = rtnl_link_get_net(net, tb);
1229 dev = rtnl_create_link(net, dest_net, ifname, ops, tb);
1230
1231 if (IS_ERR(dev))
1232 err = PTR_ERR(dev);
1233 else if (ops->newlink)
1234 err = ops->newlink(net, dev, tb, data);
1235 else
1236 err = register_netdevice(dev);
1237 if (err < 0 && !IS_ERR(dev))
1238 free_netdev(dev);
1239
1240 put_net(dest_net);
1241 return err;
1242 }
1243 }
1244
1245 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
1246 {
1247 struct net *net = sock_net(skb->sk);
1248 struct ifinfomsg *ifm;
1249 char ifname[IFNAMSIZ];
1250 struct nlattr *tb[IFLA_MAX+1];
1251 struct net_device *dev = NULL;
1252 struct sk_buff *nskb;
1253 int err;
1254
1255 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1256 if (err < 0)
1257 return err;
1258
1259 if (tb[IFLA_IFNAME])
1260 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1261
1262 ifm = nlmsg_data(nlh);
1263 if (ifm->ifi_index > 0)
1264 dev = __dev_get_by_index(net, ifm->ifi_index);
1265 else if (tb[IFLA_IFNAME])
1266 dev = __dev_get_by_name(net, ifname);
1267 else
1268 return -EINVAL;
1269
1270 if (dev == NULL)
1271 return -ENODEV;
1272
1273 nskb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL);
1274 if (nskb == NULL)
1275 return -ENOBUFS;
1276
1277 err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).pid,
1278 nlh->nlmsg_seq, 0, 0);
1279 if (err < 0) {
1280 /* -EMSGSIZE implies BUG in if_nlmsg_size */
1281 WARN_ON(err == -EMSGSIZE);
1282 kfree_skb(nskb);
1283 } else
1284 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).pid);
1285
1286 return err;
1287 }
1288
1289 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
1290 {
1291 int idx;
1292 int s_idx = cb->family;
1293
1294 if (s_idx == 0)
1295 s_idx = 1;
1296 for (idx = 1; idx < NPROTO; idx++) {
1297 int type = cb->nlh->nlmsg_type-RTM_BASE;
1298 if (idx < s_idx || idx == PF_PACKET)
1299 continue;
1300 if (rtnl_msg_handlers[idx] == NULL ||
1301 rtnl_msg_handlers[idx][type].dumpit == NULL)
1302 continue;
1303 if (idx > s_idx)
1304 memset(&cb->args[0], 0, sizeof(cb->args));
1305 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb))
1306 break;
1307 }
1308 cb->family = idx;
1309
1310 return skb->len;
1311 }
1312
1313 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change)
1314 {
1315 struct net *net = dev_net(dev);
1316 struct sk_buff *skb;
1317 int err = -ENOBUFS;
1318
1319 skb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL);
1320 if (skb == NULL)
1321 goto errout;
1322
1323 err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0);
1324 if (err < 0) {
1325 /* -EMSGSIZE implies BUG in if_nlmsg_size() */
1326 WARN_ON(err == -EMSGSIZE);
1327 kfree_skb(skb);
1328 goto errout;
1329 }
1330 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_KERNEL);
1331 return;
1332 errout:
1333 if (err < 0)
1334 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
1335 }
1336
1337 /* Protected by RTNL sempahore. */
1338 static struct rtattr **rta_buf;
1339 static int rtattr_max;
1340
1341 /* Process one rtnetlink message. */
1342
1343 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
1344 {
1345 struct net *net = sock_net(skb->sk);
1346 rtnl_doit_func doit;
1347 int sz_idx, kind;
1348 int min_len;
1349 int family;
1350 int type;
1351 int err;
1352
1353 type = nlh->nlmsg_type;
1354 if (type > RTM_MAX)
1355 return -EOPNOTSUPP;
1356
1357 type -= RTM_BASE;
1358
1359 /* All the messages must have at least 1 byte length */
1360 if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg)))
1361 return 0;
1362
1363 family = ((struct rtgenmsg *)NLMSG_DATA(nlh))->rtgen_family;
1364 if (family >= NPROTO)
1365 return -EAFNOSUPPORT;
1366
1367 sz_idx = type>>2;
1368 kind = type&3;
1369
1370 if (kind != 2 && security_netlink_recv(skb, CAP_NET_ADMIN))
1371 return -EPERM;
1372
1373 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
1374 struct sock *rtnl;
1375 rtnl_dumpit_func dumpit;
1376
1377 dumpit = rtnl_get_dumpit(family, type);
1378 if (dumpit == NULL)
1379 return -EOPNOTSUPP;
1380
1381 __rtnl_unlock();
1382 rtnl = net->rtnl;
1383 err = netlink_dump_start(rtnl, skb, nlh, dumpit, NULL);
1384 rtnl_lock();
1385 return err;
1386 }
1387
1388 memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *)));
1389
1390 min_len = rtm_min[sz_idx];
1391 if (nlh->nlmsg_len < min_len)
1392 return -EINVAL;
1393
1394 if (nlh->nlmsg_len > min_len) {
1395 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
1396 struct rtattr *attr = (void *)nlh + NLMSG_ALIGN(min_len);
1397
1398 while (RTA_OK(attr, attrlen)) {
1399 unsigned flavor = attr->rta_type;
1400 if (flavor) {
1401 if (flavor > rta_max[sz_idx])
1402 return -EINVAL;
1403 rta_buf[flavor-1] = attr;
1404 }
1405 attr = RTA_NEXT(attr, attrlen);
1406 }
1407 }
1408
1409 doit = rtnl_get_doit(family, type);
1410 if (doit == NULL)
1411 return -EOPNOTSUPP;
1412
1413 return doit(skb, nlh, (void *)&rta_buf[0]);
1414 }
1415
1416 static void rtnetlink_rcv(struct sk_buff *skb)
1417 {
1418 rtnl_lock();
1419 netlink_rcv_skb(skb, &rtnetlink_rcv_msg);
1420 rtnl_unlock();
1421 }
1422
1423 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
1424 {
1425 struct net_device *dev = ptr;
1426
1427 switch (event) {
1428 case NETDEV_UP:
1429 case NETDEV_DOWN:
1430 case NETDEV_PRE_UP:
1431 case NETDEV_POST_INIT:
1432 case NETDEV_REGISTER:
1433 case NETDEV_CHANGE:
1434 case NETDEV_GOING_DOWN:
1435 case NETDEV_UNREGISTER:
1436 case NETDEV_UNREGISTER_BATCH:
1437 break;
1438 default:
1439 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
1440 break;
1441 }
1442 return NOTIFY_DONE;
1443 }
1444
1445 static struct notifier_block rtnetlink_dev_notifier = {
1446 .notifier_call = rtnetlink_event,
1447 };
1448
1449
1450 static int __net_init rtnetlink_net_init(struct net *net)
1451 {
1452 struct sock *sk;
1453 sk = netlink_kernel_create(net, NETLINK_ROUTE, RTNLGRP_MAX,
1454 rtnetlink_rcv, &rtnl_mutex, THIS_MODULE);
1455 if (!sk)
1456 return -ENOMEM;
1457 net->rtnl = sk;
1458 return 0;
1459 }
1460
1461 static void __net_exit rtnetlink_net_exit(struct net *net)
1462 {
1463 netlink_kernel_release(net->rtnl);
1464 net->rtnl = NULL;
1465 }
1466
1467 static struct pernet_operations rtnetlink_net_ops = {
1468 .init = rtnetlink_net_init,
1469 .exit = rtnetlink_net_exit,
1470 };
1471
1472 void __init rtnetlink_init(void)
1473 {
1474 int i;
1475
1476 rtattr_max = 0;
1477 for (i = 0; i < ARRAY_SIZE(rta_max); i++)
1478 if (rta_max[i] > rtattr_max)
1479 rtattr_max = rta_max[i];
1480 rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL);
1481 if (!rta_buf)
1482 panic("rtnetlink_init: cannot allocate rta_buf\n");
1483
1484 if (register_pernet_subsys(&rtnetlink_net_ops))
1485 panic("rtnetlink_init: cannot initialize rtnetlink\n");
1486
1487 netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV);
1488 register_netdevice_notifier(&rtnetlink_dev_notifier);
1489
1490 rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink, rtnl_dump_ifinfo);
1491 rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL);
1492 rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL);
1493 rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL);
1494
1495 rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all);
1496 rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all);
1497 }
1498
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree