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