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Merge git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6
[wrt350n-kernel.git] / net / core / rtnetlink.c
blob191440100b1ba097ee4ba1a702aa138e9ba6c5eb
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/nsproxy.h>
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>
53 #include <net/fib_rules.h>
54 #include <net/rtnetlink.h>
55
56 struct rtnl_link
57 {
58 rtnl_doit_func doit;
59 rtnl_dumpit_func dumpit;
60 };
61
62 static DEFINE_MUTEX(rtnl_mutex);
63
64 void rtnl_lock(void)
65 {
66 mutex_lock(&rtnl_mutex);
67 }
68
69 void __rtnl_unlock(void)
70 {
71 mutex_unlock(&rtnl_mutex);
72 }
73
74 void rtnl_unlock(void)
75 {
76 mutex_unlock(&rtnl_mutex);
77 netdev_run_todo();
78 }
79
80 int rtnl_trylock(void)
81 {
82 return mutex_trylock(&rtnl_mutex);
83 }
84
85 static struct rtnl_link *rtnl_msg_handlers[NPROTO];
86
87 static inline int rtm_msgindex(int msgtype)
88 {
89 int msgindex = msgtype - RTM_BASE;
90
91 /*
92 * msgindex < 0 implies someone tried to register a netlink
93 * control code. msgindex >= RTM_NR_MSGTYPES may indicate that
94 * the message type has not been added to linux/rtnetlink.h
95 */
96 BUG_ON(msgindex < 0 || msgindex >= RTM_NR_MSGTYPES);
97
98 return msgindex;
99 }
100
101 static rtnl_doit_func rtnl_get_doit(int protocol, int msgindex)
102 {
103 struct rtnl_link *tab;
104
105 tab = rtnl_msg_handlers[protocol];
106 if (tab == NULL || tab[msgindex].doit == NULL)
107 tab = rtnl_msg_handlers[PF_UNSPEC];
108
109 return tab ? tab[msgindex].doit : NULL;
110 }
111
112 static rtnl_dumpit_func rtnl_get_dumpit(int protocol, int msgindex)
113 {
114 struct rtnl_link *tab;
115
116 tab = rtnl_msg_handlers[protocol];
117 if (tab == NULL || tab[msgindex].dumpit == NULL)
118 tab = rtnl_msg_handlers[PF_UNSPEC];
119
120 return tab ? tab[msgindex].dumpit : NULL;
121 }
122
123 /**
124 * __rtnl_register - Register a rtnetlink message type
125 * @protocol: Protocol family or PF_UNSPEC
126 * @msgtype: rtnetlink message type
127 * @doit: Function pointer called for each request message
128 * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message
129 *
130 * Registers the specified function pointers (at least one of them has
131 * to be non-NULL) to be called whenever a request message for the
132 * specified protocol family and message type is received.
133 *
134 * The special protocol family PF_UNSPEC may be used to define fallback
135 * function pointers for the case when no entry for the specific protocol
136 * family exists.
137 *
138 * Returns 0 on success or a negative error code.
139 */
140 int __rtnl_register(int protocol, int msgtype,
141 rtnl_doit_func doit, rtnl_dumpit_func dumpit)
142 {
143 struct rtnl_link *tab;
144 int msgindex;
145
146 BUG_ON(protocol < 0 || protocol >= NPROTO);
147 msgindex = rtm_msgindex(msgtype);
148
149 tab = rtnl_msg_handlers[protocol];
150 if (tab == NULL) {
151 tab = kcalloc(RTM_NR_MSGTYPES, sizeof(*tab), GFP_KERNEL);
152 if (tab == NULL)
153 return -ENOBUFS;
154
155 rtnl_msg_handlers[protocol] = tab;
156 }
157
158 if (doit)
159 tab[msgindex].doit = doit;
160
161 if (dumpit)
162 tab[msgindex].dumpit = dumpit;
163
164 return 0;
165 }
166
167 EXPORT_SYMBOL_GPL(__rtnl_register);
168
169 /**
170 * rtnl_register - Register a rtnetlink message type
171 *
172 * Identical to __rtnl_register() but panics on failure. This is useful
173 * as failure of this function is very unlikely, it can only happen due
174 * to lack of memory when allocating the chain to store all message
175 * handlers for a protocol. Meant for use in init functions where lack
176 * of memory implies no sense in continueing.
177 */
178 void rtnl_register(int protocol, int msgtype,
179 rtnl_doit_func doit, rtnl_dumpit_func dumpit)
180 {
181 if (__rtnl_register(protocol, msgtype, doit, dumpit) < 0)
182 panic("Unable to register rtnetlink message handler, "
183 "protocol = %d, message type = %d\n",
184 protocol, msgtype);
185 }
186
187 EXPORT_SYMBOL_GPL(rtnl_register);
188
189 /**
190 * rtnl_unregister - Unregister a rtnetlink message type
191 * @protocol: Protocol family or PF_UNSPEC
192 * @msgtype: rtnetlink message type
193 *
194 * Returns 0 on success or a negative error code.
195 */
196 int rtnl_unregister(int protocol, int msgtype)
197 {
198 int msgindex;
199
200 BUG_ON(protocol < 0 || protocol >= NPROTO);
201 msgindex = rtm_msgindex(msgtype);
202
203 if (rtnl_msg_handlers[protocol] == NULL)
204 return -ENOENT;
205
206 rtnl_msg_handlers[protocol][msgindex].doit = NULL;
207 rtnl_msg_handlers[protocol][msgindex].dumpit = NULL;
208
209 return 0;
210 }
211
212 EXPORT_SYMBOL_GPL(rtnl_unregister);
213
214 /**
215 * rtnl_unregister_all - Unregister all rtnetlink message type of a protocol
216 * @protocol : Protocol family or PF_UNSPEC
217 *
218 * Identical to calling rtnl_unregster() for all registered message types
219 * of a certain protocol family.
220 */
221 void rtnl_unregister_all(int protocol)
222 {
223 BUG_ON(protocol < 0 || protocol >= NPROTO);
224
225 kfree(rtnl_msg_handlers[protocol]);
226 rtnl_msg_handlers[protocol] = NULL;
227 }
228
229 EXPORT_SYMBOL_GPL(rtnl_unregister_all);
230
231 static LIST_HEAD(link_ops);
232
233 /**
234 * __rtnl_link_register - Register rtnl_link_ops with rtnetlink.
235 * @ops: struct rtnl_link_ops * to register
236 *
237 * The caller must hold the rtnl_mutex. This function should be used
238 * by drivers that create devices during module initialization. It
239 * must be called before registering the devices.
240 *
241 * Returns 0 on success or a negative error code.
242 */
243 int __rtnl_link_register(struct rtnl_link_ops *ops)
244 {
245 if (!ops->dellink)
246 ops->dellink = unregister_netdevice;
247
248 list_add_tail(&ops->list, &link_ops);
249 return 0;
250 }
251
252 EXPORT_SYMBOL_GPL(__rtnl_link_register);
253
254 /**
255 * rtnl_link_register - Register rtnl_link_ops with rtnetlink.
256 * @ops: struct rtnl_link_ops * to register
257 *
258 * Returns 0 on success or a negative error code.
259 */
260 int rtnl_link_register(struct rtnl_link_ops *ops)
261 {
262 int err;
263
264 rtnl_lock();
265 err = __rtnl_link_register(ops);
266 rtnl_unlock();
267 return err;
268 }
269
270 EXPORT_SYMBOL_GPL(rtnl_link_register);
271
272 /**
273 * __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
274 * @ops: struct rtnl_link_ops * to unregister
275 *
276 * The caller must hold the rtnl_mutex.
277 */
278 void __rtnl_link_unregister(struct rtnl_link_ops *ops)
279 {
280 struct net_device *dev, *n;
281 struct net *net;
282
283 for_each_net(net) {
284 restart:
285 for_each_netdev_safe(net, dev, n) {
286 if (dev->rtnl_link_ops == ops) {
287 ops->dellink(dev);
288 goto restart;
289 }
290 }
291 }
292 list_del(&ops->list);
293 }
294
295 EXPORT_SYMBOL_GPL(__rtnl_link_unregister);
296
297 /**
298 * rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
299 * @ops: struct rtnl_link_ops * to unregister
300 */
301 void rtnl_link_unregister(struct rtnl_link_ops *ops)
302 {
303 rtnl_lock();
304 __rtnl_link_unregister(ops);
305 rtnl_unlock();
306 }
307
308 EXPORT_SYMBOL_GPL(rtnl_link_unregister);
309
310 static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind)
311 {
312 const struct rtnl_link_ops *ops;
313
314 list_for_each_entry(ops, &link_ops, list) {
315 if (!strcmp(ops->kind, kind))
316 return ops;
317 }
318 return NULL;
319 }
320
321 static size_t rtnl_link_get_size(const struct net_device *dev)
322 {
323 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
324 size_t size;
325
326 if (!ops)
327 return 0;
328
329 size = nlmsg_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */
330 nlmsg_total_size(strlen(ops->kind) + 1); /* IFLA_INFO_KIND */
331
332 if (ops->get_size)
333 /* IFLA_INFO_DATA + nested data */
334 size += nlmsg_total_size(sizeof(struct nlattr)) +
335 ops->get_size(dev);
336
337 if (ops->get_xstats_size)
338 size += ops->get_xstats_size(dev); /* IFLA_INFO_XSTATS */
339
340 return size;
341 }
342
343 static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev)
344 {
345 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
346 struct nlattr *linkinfo, *data;
347 int err = -EMSGSIZE;
348
349 linkinfo = nla_nest_start(skb, IFLA_LINKINFO);
350 if (linkinfo == NULL)
351 goto out;
352
353 if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0)
354 goto err_cancel_link;
355 if (ops->fill_xstats) {
356 err = ops->fill_xstats(skb, dev);
357 if (err < 0)
358 goto err_cancel_link;
359 }
360 if (ops->fill_info) {
361 data = nla_nest_start(skb, IFLA_INFO_DATA);
362 if (data == NULL)
363 goto err_cancel_link;
364 err = ops->fill_info(skb, dev);
365 if (err < 0)
366 goto err_cancel_data;
367 nla_nest_end(skb, data);
368 }
369
370 nla_nest_end(skb, linkinfo);
371 return 0;
372
373 err_cancel_data:
374 nla_nest_cancel(skb, data);
375 err_cancel_link:
376 nla_nest_cancel(skb, linkinfo);
377 out:
378 return err;
379 }
380
381 static const int rtm_min[RTM_NR_FAMILIES] =
382 {
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)),
386 [RTM_FAM(RTM_NEWRULE)] = NLMSG_LENGTH(sizeof(struct fib_rule_hdr)),
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)),
391 [RTM_FAM(RTM_GETMULTICAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
392 [RTM_FAM(RTM_GETANYCAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
393 };
394
395 static const int rta_max[RTM_NR_FAMILIES] =
396 {
397 [RTM_FAM(RTM_NEWLINK)] = IFLA_MAX,
398 [RTM_FAM(RTM_NEWADDR)] = IFA_MAX,
399 [RTM_FAM(RTM_NEWROUTE)] = RTA_MAX,
400 [RTM_FAM(RTM_NEWRULE)] = FRA_MAX,
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,
405 };
406
407 void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const void *data)
408 {
409 struct rtattr *rta;
410 int size = RTA_LENGTH(attrlen);
411
412 rta = (struct rtattr*)skb_put(skb, RTA_ALIGN(size));
413 rta->rta_type = attrtype;
414 rta->rta_len = size;
415 memcpy(RTA_DATA(rta), data, attrlen);
416 memset(RTA_DATA(rta) + attrlen, 0, RTA_ALIGN(size) - size);
417 }
418
419 int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned group, int echo)
420 {
421 struct sock *rtnl = net->rtnl;
422 int err = 0;
423
424 NETLINK_CB(skb).dst_group = group;
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
433 int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid)
434 {
435 struct sock *rtnl = net->rtnl;
436
437 return nlmsg_unicast(rtnl, skb, pid);
438 }
439
440 int rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group,
441 struct nlmsghdr *nlh, gfp_t flags)
442 {
443 struct sock *rtnl = net->rtnl;
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
452 void rtnl_set_sk_err(struct net *net, u32 group, int error)
453 {
454 struct sock *rtnl = net->rtnl;
455
456 netlink_set_err(rtnl, 0, group, error);
457 }
458
459 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics)
460 {
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 }
473 }
474
475 if (!valid) {
476 nla_nest_cancel(skb, mx);
477 return 0;
478 }
479
480 return nla_nest_end(skb, mx);
481
482 nla_put_failure:
483 return nla_nest_cancel(skb, mx);
484 }
485
486 int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id,
487 u32 ts, u32 tsage, long expires, u32 error)
488 {
489 struct rta_cacheinfo ci = {
490 .rta_lastuse = jiffies_to_clock_t(jiffies - dst->lastuse),
491 .rta_used = dst->__use,
492 .rta_clntref = atomic_read(&(dst->__refcnt)),
493 .rta_error = error,
494 .rta_id = id,
495 .rta_ts = ts,
496 .rta_tsage = tsage,
497 };
498
499 if (expires)
500 ci.rta_expires = jiffies_to_clock_t(expires);
501
502 return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci);
503 }
504
505 EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo);
506
507 <<<<<<< HEAD:net/core/rtnetlink.c
508 static int set_operstate(struct net_device *dev, unsigned char transition, bool send_notification)
509 =======
510 static void set_operstate(struct net_device *dev, unsigned char transition)
511 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:net/core/rtnetlink.c
512 {
513 unsigned char operstate = dev->operstate;
514
515 switch(transition) {
516 case IF_OPER_UP:
517 if ((operstate == IF_OPER_DORMANT ||
518 operstate == IF_OPER_UNKNOWN) &&
519 !netif_dormant(dev))
520 operstate = IF_OPER_UP;
521 break;
522
523 case IF_OPER_DORMANT:
524 if (operstate == IF_OPER_UP ||
525 operstate == IF_OPER_UNKNOWN)
526 operstate = IF_OPER_DORMANT;
527 break;
528 }
529
530 if (dev->operstate != operstate) {
531 write_lock_bh(&dev_base_lock);
532 dev->operstate = operstate;
533 write_unlock_bh(&dev_base_lock);
534 <<<<<<< HEAD:net/core/rtnetlink.c
535
536 if (send_notification)
537 netdev_state_change(dev);
538 return 1;
539 } else
540 return 0;
541 =======
542 netdev_state_change(dev);
543 }
544 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:net/core/rtnetlink.c
545 }
546
547 static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
548 struct net_device_stats *b)
549 {
550 a->rx_packets = b->rx_packets;
551 a->tx_packets = b->tx_packets;
552 a->rx_bytes = b->rx_bytes;
553 a->tx_bytes = b->tx_bytes;
554 a->rx_errors = b->rx_errors;
555 a->tx_errors = b->tx_errors;
556 a->rx_dropped = b->rx_dropped;
557 a->tx_dropped = b->tx_dropped;
558
559 a->multicast = b->multicast;
560 a->collisions = b->collisions;
561
562 a->rx_length_errors = b->rx_length_errors;
563 a->rx_over_errors = b->rx_over_errors;
564 a->rx_crc_errors = b->rx_crc_errors;
565 a->rx_frame_errors = b->rx_frame_errors;
566 a->rx_fifo_errors = b->rx_fifo_errors;
567 a->rx_missed_errors = b->rx_missed_errors;
568
569 a->tx_aborted_errors = b->tx_aborted_errors;
570 a->tx_carrier_errors = b->tx_carrier_errors;
571 a->tx_fifo_errors = b->tx_fifo_errors;
572 a->tx_heartbeat_errors = b->tx_heartbeat_errors;
573 a->tx_window_errors = b->tx_window_errors;
574
575 a->rx_compressed = b->rx_compressed;
576 a->tx_compressed = b->tx_compressed;
577 };
578
579 static inline size_t if_nlmsg_size(const struct net_device *dev)
580 {
581 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
582 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
583 + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */
584 + nla_total_size(sizeof(struct rtnl_link_ifmap))
585 + nla_total_size(sizeof(struct rtnl_link_stats))
586 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
587 + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */
588 + nla_total_size(4) /* IFLA_TXQLEN */
589 + nla_total_size(4) /* IFLA_WEIGHT */
590 + nla_total_size(4) /* IFLA_MTU */
591 + nla_total_size(4) /* IFLA_LINK */
592 + nla_total_size(4) /* IFLA_MASTER */
593 + nla_total_size(1) /* IFLA_OPERSTATE */
594 + nla_total_size(1) /* IFLA_LINKMODE */
595 + rtnl_link_get_size(dev); /* IFLA_LINKINFO */
596 }
597
598 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
599 int type, u32 pid, u32 seq, u32 change,
600 unsigned int flags)
601 {
602 struct ifinfomsg *ifm;
603 struct nlmsghdr *nlh;
604
605 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
606 if (nlh == NULL)
607 return -EMSGSIZE;
608
609 ifm = nlmsg_data(nlh);
610 ifm->ifi_family = AF_UNSPEC;
611 ifm->__ifi_pad = 0;
612 ifm->ifi_type = dev->type;
613 ifm->ifi_index = dev->ifindex;
614 ifm->ifi_flags = dev_get_flags(dev);
615 ifm->ifi_change = change;
616
617 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
618 NLA_PUT_U32(skb, IFLA_TXQLEN, dev->tx_queue_len);
619 NLA_PUT_U8(skb, IFLA_OPERSTATE,
620 netif_running(dev) ? dev->operstate : IF_OPER_DOWN);
621 NLA_PUT_U8(skb, IFLA_LINKMODE, dev->link_mode);
622 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
623
624 if (dev->ifindex != dev->iflink)
625 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
626
627 if (dev->master)
628 NLA_PUT_U32(skb, IFLA_MASTER, dev->master->ifindex);
629
630 if (dev->qdisc_sleeping)
631 NLA_PUT_STRING(skb, IFLA_QDISC, dev->qdisc_sleeping->ops->id);
632
633 if (1) {
634 struct rtnl_link_ifmap map = {
635 .mem_start = dev->mem_start,
636 .mem_end = dev->mem_end,
637 .base_addr = dev->base_addr,
638 .irq = dev->irq,
639 .dma = dev->dma,
640 .port = dev->if_port,
641 };
642 NLA_PUT(skb, IFLA_MAP, sizeof(map), &map);
643 }
644
645 if (dev->addr_len) {
646 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
647 NLA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast);
648 }
649
650 if (dev->get_stats) {
651 struct net_device_stats *stats = dev->get_stats(dev);
652 if (stats) {
653 struct nlattr *attr;
654
655 attr = nla_reserve(skb, IFLA_STATS,
656 sizeof(struct rtnl_link_stats));
657 if (attr == NULL)
658 goto nla_put_failure;
659
660 copy_rtnl_link_stats(nla_data(attr), stats);
661 }
662 }
663
664 if (dev->rtnl_link_ops) {
665 if (rtnl_link_fill(skb, dev) < 0)
666 goto nla_put_failure;
667 }
668
669 return nlmsg_end(skb, nlh);
670
671 nla_put_failure:
672 nlmsg_cancel(skb, nlh);
673 return -EMSGSIZE;
674 }
675
676 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
677 {
678 struct net *net = skb->sk->sk_net;
679 int idx;
680 int s_idx = cb->args[0];
681 struct net_device *dev;
682
683 idx = 0;
684 for_each_netdev(net, dev) {
685 if (idx < s_idx)
686 goto cont;
687 if (rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK,
688 NETLINK_CB(cb->skb).pid,
689 cb->nlh->nlmsg_seq, 0, NLM_F_MULTI) <= 0)
690 break;
691 cont:
692 idx++;
693 }
694 cb->args[0] = idx;
695
696 return skb->len;
697 }
698
699 const struct nla_policy ifla_policy[IFLA_MAX+1] = {
700 [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 },
701 [IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
702 [IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
703 [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) },
704 [IFLA_MTU] = { .type = NLA_U32 },
705 <<<<<<< HEAD:net/core/rtnetlink.c
706 =======
707 [IFLA_LINK] = { .type = NLA_U32 },
708 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:net/core/rtnetlink.c
709 [IFLA_TXQLEN] = { .type = NLA_U32 },
710 [IFLA_WEIGHT] = { .type = NLA_U32 },
711 [IFLA_OPERSTATE] = { .type = NLA_U8 },
712 [IFLA_LINKMODE] = { .type = NLA_U8 },
713 <<<<<<< HEAD:net/core/rtnetlink.c
714 =======
715 [IFLA_LINKINFO] = { .type = NLA_NESTED },
716 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:net/core/rtnetlink.c
717 [IFLA_NET_NS_PID] = { .type = NLA_U32 },
718 };
719
720 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
721 [IFLA_INFO_KIND] = { .type = NLA_STRING },
722 [IFLA_INFO_DATA] = { .type = NLA_NESTED },
723 };
724
725 static struct net *get_net_ns_by_pid(pid_t pid)
726 {
727 struct task_struct *tsk;
728 struct net *net;
729
730 /* Lookup the network namespace */
731 net = ERR_PTR(-ESRCH);
732 rcu_read_lock();
733 tsk = find_task_by_vpid(pid);
734 if (tsk) {
735 struct nsproxy *nsproxy;
736 nsproxy = task_nsproxy(tsk);
737 if (nsproxy)
738 net = get_net(nsproxy->net_ns);
739 }
740 rcu_read_unlock();
741 return net;
742 }
743
744 <<<<<<< HEAD:net/core/rtnetlink.c
745 =======
746 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[])
747 {
748 if (dev) {
749 if (tb[IFLA_ADDRESS] &&
750 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
751 return -EINVAL;
752
753 if (tb[IFLA_BROADCAST] &&
754 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
755 return -EINVAL;
756 }
757
758 return 0;
759 }
760
761 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:net/core/rtnetlink.c
762 static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm,
763 struct nlattr **tb, char *ifname, int modified)
764 {
765 int send_addr_notify = 0;
766 int err;
767
768 if (tb[IFLA_NET_NS_PID]) {
769 struct net *net;
770 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID]));
771 if (IS_ERR(net)) {
772 err = PTR_ERR(net);
773 goto errout;
774 }
775 err = dev_change_net_namespace(dev, net, ifname);
776 put_net(net);
777 if (err)
778 goto errout;
779 modified = 1;
780 }
781
782 if (tb[IFLA_MAP]) {
783 struct rtnl_link_ifmap *u_map;
784 struct ifmap k_map;
785
786 if (!dev->set_config) {
787 err = -EOPNOTSUPP;
788 goto errout;
789 }
790
791 if (!netif_device_present(dev)) {
792 err = -ENODEV;
793 goto errout;
794 }
795
796 u_map = nla_data(tb[IFLA_MAP]);
797 k_map.mem_start = (unsigned long) u_map->mem_start;
798 k_map.mem_end = (unsigned long) u_map->mem_end;
799 k_map.base_addr = (unsigned short) u_map->base_addr;
800 k_map.irq = (unsigned char) u_map->irq;
801 k_map.dma = (unsigned char) u_map->dma;
802 k_map.port = (unsigned char) u_map->port;
803
804 err = dev->set_config(dev, &k_map);
805 if (err < 0)
806 goto errout;
807
808 modified = 1;
809 }
810
811 if (tb[IFLA_ADDRESS]) {
812 struct sockaddr *sa;
813 int len;
814
815 if (!dev->set_mac_address) {
816 err = -EOPNOTSUPP;
817 goto errout;
818 }
819
820 if (!netif_device_present(dev)) {
821 err = -ENODEV;
822 goto errout;
823 }
824
825 len = sizeof(sa_family_t) + dev->addr_len;
826 sa = kmalloc(len, GFP_KERNEL);
827 if (!sa) {
828 err = -ENOMEM;
829 goto errout;
830 }
831 sa->sa_family = dev->type;
832 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
833 dev->addr_len);
834 err = dev->set_mac_address(dev, sa);
835 kfree(sa);
836 if (err)
837 goto errout;
838 send_addr_notify = 1;
839 modified = 1;
840 }
841
842 if (tb[IFLA_MTU]) {
843 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
844 if (err < 0)
845 goto errout;
846 modified = 1;
847 }
848
849 /*
850 * Interface selected by interface index but interface
851 * name provided implies that a name change has been
852 * requested.
853 */
854 if (ifm->ifi_index > 0 && ifname[0]) {
855 err = dev_change_name(dev, ifname);
856 if (err < 0)
857 goto errout;
858 modified = 1;
859 }
860
861 if (tb[IFLA_BROADCAST]) {
862 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
863 send_addr_notify = 1;
864 <<<<<<< HEAD:net/core/rtnetlink.c
865 modified = 1;
866 =======
867 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:net/core/rtnetlink.c
868 }
869
870 if (ifm->ifi_flags || ifm->ifi_change) {
871 unsigned int flags = ifm->ifi_flags;
872
873 /* bugwards compatibility: ifi_change == 0 is treated as ~0 */
874 if (ifm->ifi_change)
875 flags = (flags & ifm->ifi_change) |
876 (dev->flags & ~ifm->ifi_change);
877 dev_change_flags(dev, flags);
878 }
879
880 <<<<<<< HEAD:net/core/rtnetlink.c
881 if (tb[IFLA_TXQLEN]) {
882 if (dev->tx_queue_len != nla_get_u32(tb[IFLA_TXQLEN])) {
883 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
884 modified = 1;
885 }
886 }
887 =======
888 if (tb[IFLA_TXQLEN])
889 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
890 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:net/core/rtnetlink.c
891
892 if (tb[IFLA_OPERSTATE])
893 <<<<<<< HEAD:net/core/rtnetlink.c
894 modified |= set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]), false);
895 =======
896 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
897 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:net/core/rtnetlink.c
898
899 if (tb[IFLA_LINKMODE]) {
900 <<<<<<< HEAD:net/core/rtnetlink.c
901 if (dev->link_mode != nla_get_u8(tb[IFLA_LINKMODE])) {
902 write_lock_bh(&dev_base_lock);
903 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
904 write_lock_bh(&dev_base_lock);
905 modified = 1;
906 }
907 =======
908 write_lock_bh(&dev_base_lock);
909 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
910 write_unlock_bh(&dev_base_lock);
911 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:net/core/rtnetlink.c
912 }
913
914 err = 0;
915
916 errout:
917 if (err < 0 && modified && net_ratelimit())
918 printk(KERN_WARNING "A link change request failed with "
919 "some changes comitted already. Interface %s may "
920 "have been left with an inconsistent configuration, "
921 "please check.\n", dev->name);
922
923 if (send_addr_notify)
924 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
925 <<<<<<< HEAD:net/core/rtnetlink.c
926
927 if (modified)
928 netdev_state_change(dev);
929
930 =======
931 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:net/core/rtnetlink.c
932 return err;
933 }
934
935 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
936 {
937 struct net *net = skb->sk->sk_net;
938 struct ifinfomsg *ifm;
939 struct net_device *dev;
940 int err;
941 struct nlattr *tb[IFLA_MAX+1];
942 char ifname[IFNAMSIZ];
943
944 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
945 if (err < 0)
946 goto errout;
947
948 if (tb[IFLA_IFNAME])
949 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
950 else
951 ifname[0] = '\0';
952
953 err = -EINVAL;
954 ifm = nlmsg_data(nlh);
955 if (ifm->ifi_index > 0)
956 dev = dev_get_by_index(net, ifm->ifi_index);
957 else if (tb[IFLA_IFNAME])
958 dev = dev_get_by_name(net, ifname);
959 else
960 goto errout;
961
962 if (dev == NULL) {
963 err = -ENODEV;
964 goto errout;
965 }
966
967 <<<<<<< HEAD:net/core/rtnetlink.c
968 if (tb[IFLA_ADDRESS] &&
969 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
970 goto errout_dev;
971
972 if (tb[IFLA_BROADCAST] &&
973 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
974 =======
975 if ((err = validate_linkmsg(dev, tb)) < 0)
976 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:net/core/rtnetlink.c
977 goto errout_dev;
978
979 err = do_setlink(dev, ifm, tb, ifname, 0);
980 errout_dev:
981 dev_put(dev);
982 errout:
983 return err;
984 }
985
986 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
987 {
988 struct net *net = skb->sk->sk_net;
989 const struct rtnl_link_ops *ops;
990 struct net_device *dev;
991 struct ifinfomsg *ifm;
992 char ifname[IFNAMSIZ];
993 struct nlattr *tb[IFLA_MAX+1];
994 int err;
995
996 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
997 if (err < 0)
998 return err;
999
1000 if (tb[IFLA_IFNAME])
1001 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1002
1003 ifm = nlmsg_data(nlh);
1004 if (ifm->ifi_index > 0)
1005 dev = __dev_get_by_index(net, ifm->ifi_index);
1006 else if (tb[IFLA_IFNAME])
1007 dev = __dev_get_by_name(net, ifname);
1008 else
1009 return -EINVAL;
1010
1011 if (!dev)
1012 return -ENODEV;
1013
1014 ops = dev->rtnl_link_ops;
1015 if (!ops)
1016 return -EOPNOTSUPP;
1017
1018 ops->dellink(dev);
1019 return 0;
1020 }
1021
1022 struct net_device *rtnl_create_link(struct net *net, char *ifname,
1023 const struct rtnl_link_ops *ops, struct nlattr *tb[])
1024 {
1025 int err;
1026 struct net_device *dev;
1027
1028 err = -ENOMEM;
1029 dev = alloc_netdev(ops->priv_size, ifname, ops->setup);
1030 if (!dev)
1031 goto err;
1032
1033 if (strchr(dev->name, '%')) {
1034 err = dev_alloc_name(dev, dev->name);
1035 if (err < 0)
1036 goto err_free;
1037 }
1038
1039 dev->nd_net = net;
1040 dev->rtnl_link_ops = ops;
1041
1042 if (tb[IFLA_MTU])
1043 dev->mtu = nla_get_u32(tb[IFLA_MTU]);
1044 if (tb[IFLA_ADDRESS])
1045 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]),
1046 nla_len(tb[IFLA_ADDRESS]));
1047 if (tb[IFLA_BROADCAST])
1048 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]),
1049 nla_len(tb[IFLA_BROADCAST]));
1050 if (tb[IFLA_TXQLEN])
1051 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
1052 if (tb[IFLA_OPERSTATE])
1053 <<<<<<< HEAD:net/core/rtnetlink.c
1054 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]), true);
1055 =======
1056 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
1057 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:net/core/rtnetlink.c
1058 if (tb[IFLA_LINKMODE])
1059 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
1060
1061 return dev;
1062
1063 err_free:
1064 free_netdev(dev);
1065 err:
1066 return ERR_PTR(err);
1067 }
1068
1069 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
1070 {
1071 struct net *net = skb->sk->sk_net;
1072 const struct rtnl_link_ops *ops;
1073 struct net_device *dev;
1074 struct ifinfomsg *ifm;
1075 char kind[MODULE_NAME_LEN];
1076 char ifname[IFNAMSIZ];
1077 struct nlattr *tb[IFLA_MAX+1];
1078 struct nlattr *linkinfo[IFLA_INFO_MAX+1];
1079 int err;
1080
1081 #ifdef CONFIG_KMOD
1082 replay:
1083 #endif
1084 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1085 if (err < 0)
1086 return err;
1087
1088 if (tb[IFLA_IFNAME])
1089 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1090 else
1091 ifname[0] = '\0';
1092
1093 ifm = nlmsg_data(nlh);
1094 if (ifm->ifi_index > 0)
1095 dev = __dev_get_by_index(net, ifm->ifi_index);
1096 else if (ifname[0])
1097 dev = __dev_get_by_name(net, ifname);
1098 else
1099 dev = NULL;
1100
1101 <<<<<<< HEAD:net/core/rtnetlink.c
1102 =======
1103 if ((err = validate_linkmsg(dev, tb)) < 0)
1104 return err;
1105
1106 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:net/core/rtnetlink.c
1107 if (tb[IFLA_LINKINFO]) {
1108 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX,
1109 tb[IFLA_LINKINFO], ifla_info_policy);
1110 if (err < 0)
1111 return err;
1112 } else
1113 memset(linkinfo, 0, sizeof(linkinfo));
1114
1115 if (linkinfo[IFLA_INFO_KIND]) {
1116 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind));
1117 ops = rtnl_link_ops_get(kind);
1118 } else {
1119 kind[0] = '\0';
1120 ops = NULL;
1121 }
1122
1123 if (1) {
1124 struct nlattr *attr[ops ? ops->maxtype + 1 : 0], **data = NULL;
1125
1126 if (ops) {
1127 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
1128 err = nla_parse_nested(attr, ops->maxtype,
1129 linkinfo[IFLA_INFO_DATA],
1130 ops->policy);
1131 if (err < 0)
1132 return err;
1133 data = attr;
1134 }
1135 if (ops->validate) {
1136 err = ops->validate(tb, data);
1137 if (err < 0)
1138 return err;
1139 }
1140 }
1141
1142 if (dev) {
1143 int modified = 0;
1144
1145 if (nlh->nlmsg_flags & NLM_F_EXCL)
1146 return -EEXIST;
1147 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1148 return -EOPNOTSUPP;
1149
1150 if (linkinfo[IFLA_INFO_DATA]) {
1151 if (!ops || ops != dev->rtnl_link_ops ||
1152 !ops->changelink)
1153 return -EOPNOTSUPP;
1154
1155 err = ops->changelink(dev, tb, data);
1156 if (err < 0)
1157 return err;
1158 modified = 1;
1159 }
1160
1161 return do_setlink(dev, ifm, tb, ifname, modified);
1162 }
1163
1164 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
1165 return -ENODEV;
1166
1167 if (ifm->ifi_index || ifm->ifi_flags || ifm->ifi_change)
1168 return -EOPNOTSUPP;
1169 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO])
1170 return -EOPNOTSUPP;
1171
1172 if (!ops) {
1173 #ifdef CONFIG_KMOD
1174 if (kind[0]) {
1175 __rtnl_unlock();
1176 request_module("rtnl-link-%s", kind);
1177 rtnl_lock();
1178 ops = rtnl_link_ops_get(kind);
1179 if (ops)
1180 goto replay;
1181 }
1182 #endif
1183 return -EOPNOTSUPP;
1184 }
1185
1186 if (!ifname[0])
1187 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
1188
1189 dev = rtnl_create_link(net, ifname, ops, tb);
1190
1191 if (IS_ERR(dev))
1192 err = PTR_ERR(dev);
1193 else if (ops->newlink)
1194 err = ops->newlink(dev, tb, data);
1195 else
1196 err = register_netdevice(dev);
1197
1198 if (err < 0 && !IS_ERR(dev))
1199 free_netdev(dev);
1200 return err;
1201 }
1202 }
1203
1204 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
1205 {
1206 struct net *net = skb->sk->sk_net;
1207 struct ifinfomsg *ifm;
1208 struct nlattr *tb[IFLA_MAX+1];
1209 struct net_device *dev = NULL;
1210 struct sk_buff *nskb;
1211 int err;
1212
1213 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1214 if (err < 0)
1215 return err;
1216
1217 ifm = nlmsg_data(nlh);
1218 if (ifm->ifi_index > 0) {
1219 dev = dev_get_by_index(net, ifm->ifi_index);
1220 if (dev == NULL)
1221 return -ENODEV;
1222 } else
1223 return -EINVAL;
1224
1225 nskb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL);
1226 if (nskb == NULL) {
1227 err = -ENOBUFS;
1228 goto errout;
1229 }
1230
1231 err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).pid,
1232 nlh->nlmsg_seq, 0, 0);
1233 if (err < 0) {
1234 /* -EMSGSIZE implies BUG in if_nlmsg_size */
1235 WARN_ON(err == -EMSGSIZE);
1236 kfree_skb(nskb);
1237 goto errout;
1238 }
1239 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).pid);
1240 errout:
1241 dev_put(dev);
1242
1243 return err;
1244 }
1245
1246 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
1247 {
1248 int idx;
1249 int s_idx = cb->family;
1250
1251 if (s_idx == 0)
1252 s_idx = 1;
1253 for (idx=1; idx<NPROTO; idx++) {
1254 int type = cb->nlh->nlmsg_type-RTM_BASE;
1255 if (idx < s_idx || idx == PF_PACKET)
1256 continue;
1257 if (rtnl_msg_handlers[idx] == NULL ||
1258 rtnl_msg_handlers[idx][type].dumpit == NULL)
1259 continue;
1260 if (idx > s_idx)
1261 memset(&cb->args[0], 0, sizeof(cb->args));
1262 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb))
1263 break;
1264 }
1265 cb->family = idx;
1266
1267 return skb->len;
1268 }
1269
1270 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change)
1271 {
1272 struct net *net = dev->nd_net;
1273 struct sk_buff *skb;
1274 int err = -ENOBUFS;
1275
1276 skb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL);
1277 if (skb == NULL)
1278 goto errout;
1279
1280 err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0);
1281 if (err < 0) {
1282 /* -EMSGSIZE implies BUG in if_nlmsg_size() */
1283 WARN_ON(err == -EMSGSIZE);
1284 kfree_skb(skb);
1285 goto errout;
1286 }
1287 err = rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_KERNEL);
1288 errout:
1289 if (err < 0)
1290 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
1291 }
1292
1293 /* Protected by RTNL sempahore. */
1294 static struct rtattr **rta_buf;
1295 static int rtattr_max;
1296
1297 /* Process one rtnetlink message. */
1298
1299 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
1300 {
1301 struct net *net = skb->sk->sk_net;
1302 rtnl_doit_func doit;
1303 int sz_idx, kind;
1304 int min_len;
1305 int family;
1306 int type;
1307 int err;
1308
1309 type = nlh->nlmsg_type;
1310 if (type > RTM_MAX)
1311 return -EOPNOTSUPP;
1312
1313 type -= RTM_BASE;
1314
1315 /* All the messages must have at least 1 byte length */
1316 if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg)))
1317 return 0;
1318
1319 family = ((struct rtgenmsg*)NLMSG_DATA(nlh))->rtgen_family;
1320 if (family >= NPROTO)
1321 return -EAFNOSUPPORT;
1322
1323 sz_idx = type>>2;
1324 kind = type&3;
1325
1326 if (kind != 2 && security_netlink_recv(skb, CAP_NET_ADMIN))
1327 return -EPERM;
1328
1329 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
1330 struct sock *rtnl;
1331 rtnl_dumpit_func dumpit;
1332
1333 dumpit = rtnl_get_dumpit(family, type);
1334 if (dumpit == NULL)
1335 return -EOPNOTSUPP;
1336
1337 __rtnl_unlock();
1338 rtnl = net->rtnl;
1339 err = netlink_dump_start(rtnl, skb, nlh, dumpit, NULL);
1340 rtnl_lock();
1341 return err;
1342 }
1343
1344 memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *)));
1345
1346 min_len = rtm_min[sz_idx];
1347 if (nlh->nlmsg_len < min_len)
1348 return -EINVAL;
1349
1350 if (nlh->nlmsg_len > min_len) {
1351 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
1352 struct rtattr *attr = (void*)nlh + NLMSG_ALIGN(min_len);
1353
1354 while (RTA_OK(attr, attrlen)) {
1355 unsigned flavor = attr->rta_type;
1356 if (flavor) {
1357 if (flavor > rta_max[sz_idx])
1358 return -EINVAL;
1359 rta_buf[flavor-1] = attr;
1360 }
1361 attr = RTA_NEXT(attr, attrlen);
1362 }
1363 }
1364
1365 doit = rtnl_get_doit(family, type);
1366 if (doit == NULL)
1367 return -EOPNOTSUPP;
1368
1369 return doit(skb, nlh, (void *)&rta_buf[0]);
1370 }
1371
1372 static void rtnetlink_rcv(struct sk_buff *skb)
1373 {
1374 rtnl_lock();
1375 netlink_rcv_skb(skb, &rtnetlink_rcv_msg);
1376 rtnl_unlock();
1377 }
1378
1379 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
1380 {
1381 struct net_device *dev = ptr;
1382
1383 switch (event) {
1384 case NETDEV_UNREGISTER:
1385 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);
1386 break;
1387 case NETDEV_REGISTER:
1388 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
1389 break;
1390 case NETDEV_UP:
1391 case NETDEV_DOWN:
1392 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
1393 break;
1394 case NETDEV_CHANGE:
1395 case NETDEV_GOING_DOWN:
1396 break;
1397 default:
1398 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
1399 break;
1400 }
1401 return NOTIFY_DONE;
1402 }
1403
1404 static struct notifier_block rtnetlink_dev_notifier = {
1405 .notifier_call = rtnetlink_event,
1406 };
1407
1408
1409 static int rtnetlink_net_init(struct net *net)
1410 {
1411 struct sock *sk;
1412 sk = netlink_kernel_create(net, NETLINK_ROUTE, RTNLGRP_MAX,
1413 rtnetlink_rcv, &rtnl_mutex, THIS_MODULE);
1414 if (!sk)
1415 return -ENOMEM;
1416 net->rtnl = sk;
1417 return 0;
1418 }
1419
1420 static void rtnetlink_net_exit(struct net *net)
1421 {
1422 netlink_kernel_release(net->rtnl);
1423 net->rtnl = NULL;
1424 }
1425
1426 static struct pernet_operations rtnetlink_net_ops = {
1427 .init = rtnetlink_net_init,
1428 .exit = rtnetlink_net_exit,
1429 };
1430
1431 void __init rtnetlink_init(void)
1432 {
1433 int i;
1434
1435 rtattr_max = 0;
1436 for (i = 0; i < ARRAY_SIZE(rta_max); i++)
1437 if (rta_max[i] > rtattr_max)
1438 rtattr_max = rta_max[i];
1439 rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL);
1440 if (!rta_buf)
1441 panic("rtnetlink_init: cannot allocate rta_buf\n");
1442
1443 if (register_pernet_subsys(&rtnetlink_net_ops))
1444 panic("rtnetlink_init: cannot initialize rtnetlink\n");
1445
1446 netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV);
1447 register_netdevice_notifier(&rtnetlink_dev_notifier);
1448
1449 rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink, rtnl_dump_ifinfo);
1450 rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL);
1451 rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL);
1452 rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL);
1453
1454 rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all);
1455 rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all);
1456 }
1457
1458 EXPORT_SYMBOL(__rta_fill);
1459 EXPORT_SYMBOL(rtnetlink_put_metrics);
1460 EXPORT_SYMBOL(rtnl_lock);
1461 EXPORT_SYMBOL(rtnl_trylock);
1462 EXPORT_SYMBOL(rtnl_unlock);
1463 EXPORT_SYMBOL(rtnl_unicast);
1464 EXPORT_SYMBOL(rtnl_notify);
1465 EXPORT_SYMBOL(rtnl_set_sk_err);
1466 EXPORT_SYMBOL(rtnl_create_link);
1467 EXPORT_SYMBOL(ifla_policy);
WRT350N Kernel Patches