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sysctl: ipv6 route flushing (kill binary path)
[wrt350n-kernel.git] / net / core / rtnetlink.c
blob1072d16696c3b651993ef7130bd09a475c072b81
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 netdev_run_todo();
79 }
80
81 int rtnl_trylock(void)
82 {
83 return mutex_trylock(&rtnl_mutex);
84 }
85
86 int rtattr_parse(struct rtattr *tb[], int maxattr, struct rtattr *rta, int len)
87 {
88 memset(tb, 0, sizeof(struct rtattr*)*maxattr);
89
90 while (RTA_OK(rta, len)) {
91 unsigned flavor = rta->rta_type;
92 if (flavor && flavor <= maxattr)
93 tb[flavor-1] = rta;
94 rta = RTA_NEXT(rta, len);
95 }
96 return 0;
97 }
98
99 int __rtattr_parse_nested_compat(struct rtattr *tb[], int maxattr,
100 struct rtattr *rta, int len)
101 {
102 if (RTA_PAYLOAD(rta) < len)
103 return -1;
104 if (RTA_PAYLOAD(rta) >= RTA_ALIGN(len) + sizeof(struct rtattr)) {
105 rta = RTA_DATA(rta) + RTA_ALIGN(len);
106 return rtattr_parse_nested(tb, maxattr, rta);
107 }
108 memset(tb, 0, sizeof(struct rtattr *) * maxattr);
109 return 0;
110 }
111
112 static struct rtnl_link *rtnl_msg_handlers[NPROTO];
113
114 static inline int rtm_msgindex(int msgtype)
115 {
116 int msgindex = msgtype - RTM_BASE;
117
118 /*
119 * msgindex < 0 implies someone tried to register a netlink
120 * control code. msgindex >= RTM_NR_MSGTYPES may indicate that
121 * the message type has not been added to linux/rtnetlink.h
122 */
123 BUG_ON(msgindex < 0 || msgindex >= RTM_NR_MSGTYPES);
124
125 return msgindex;
126 }
127
128 static rtnl_doit_func rtnl_get_doit(int protocol, int msgindex)
129 {
130 struct rtnl_link *tab;
131
132 tab = rtnl_msg_handlers[protocol];
133 if (tab == NULL || tab[msgindex].doit == NULL)
134 tab = rtnl_msg_handlers[PF_UNSPEC];
135
136 return tab ? tab[msgindex].doit : NULL;
137 }
138
139 static rtnl_dumpit_func rtnl_get_dumpit(int protocol, int msgindex)
140 {
141 struct rtnl_link *tab;
142
143 tab = rtnl_msg_handlers[protocol];
144 if (tab == NULL || tab[msgindex].dumpit == NULL)
145 tab = rtnl_msg_handlers[PF_UNSPEC];
146
147 return tab ? tab[msgindex].dumpit : NULL;
148 }
149
150 /**
151 * __rtnl_register - Register a rtnetlink message type
152 * @protocol: Protocol family or PF_UNSPEC
153 * @msgtype: rtnetlink message type
154 * @doit: Function pointer called for each request message
155 * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message
156 *
157 * Registers the specified function pointers (at least one of them has
158 * to be non-NULL) to be called whenever a request message for the
159 * specified protocol family and message type is received.
160 *
161 * The special protocol family PF_UNSPEC may be used to define fallback
162 * function pointers for the case when no entry for the specific protocol
163 * family exists.
164 *
165 * Returns 0 on success or a negative error code.
166 */
167 int __rtnl_register(int protocol, int msgtype,
168 rtnl_doit_func doit, rtnl_dumpit_func dumpit)
169 {
170 struct rtnl_link *tab;
171 int msgindex;
172
173 BUG_ON(protocol < 0 || protocol >= NPROTO);
174 msgindex = rtm_msgindex(msgtype);
175
176 tab = rtnl_msg_handlers[protocol];
177 if (tab == NULL) {
178 tab = kcalloc(RTM_NR_MSGTYPES, sizeof(*tab), GFP_KERNEL);
179 if (tab == NULL)
180 return -ENOBUFS;
181
182 rtnl_msg_handlers[protocol] = tab;
183 }
184
185 if (doit)
186 tab[msgindex].doit = doit;
187
188 if (dumpit)
189 tab[msgindex].dumpit = dumpit;
190
191 return 0;
192 }
193
194 EXPORT_SYMBOL_GPL(__rtnl_register);
195
196 /**
197 * rtnl_register - Register a rtnetlink message type
198 *
199 * Identical to __rtnl_register() but panics on failure. This is useful
200 * as failure of this function is very unlikely, it can only happen due
201 * to lack of memory when allocating the chain to store all message
202 * handlers for a protocol. Meant for use in init functions where lack
203 * of memory implies no sense in continueing.
204 */
205 void rtnl_register(int protocol, int msgtype,
206 rtnl_doit_func doit, rtnl_dumpit_func dumpit)
207 {
208 if (__rtnl_register(protocol, msgtype, doit, dumpit) < 0)
209 panic("Unable to register rtnetlink message handler, "
210 "protocol = %d, message type = %d\n",
211 protocol, msgtype);
212 }
213
214 EXPORT_SYMBOL_GPL(rtnl_register);
215
216 /**
217 * rtnl_unregister - Unregister a rtnetlink message type
218 * @protocol: Protocol family or PF_UNSPEC
219 * @msgtype: rtnetlink message type
220 *
221 * Returns 0 on success or a negative error code.
222 */
223 int rtnl_unregister(int protocol, int msgtype)
224 {
225 int msgindex;
226
227 BUG_ON(protocol < 0 || protocol >= NPROTO);
228 msgindex = rtm_msgindex(msgtype);
229
230 if (rtnl_msg_handlers[protocol] == NULL)
231 return -ENOENT;
232
233 rtnl_msg_handlers[protocol][msgindex].doit = NULL;
234 rtnl_msg_handlers[protocol][msgindex].dumpit = NULL;
235
236 return 0;
237 }
238
239 EXPORT_SYMBOL_GPL(rtnl_unregister);
240
241 /**
242 * rtnl_unregister_all - Unregister all rtnetlink message type of a protocol
243 * @protocol : Protocol family or PF_UNSPEC
244 *
245 * Identical to calling rtnl_unregster() for all registered message types
246 * of a certain protocol family.
247 */
248 void rtnl_unregister_all(int protocol)
249 {
250 BUG_ON(protocol < 0 || protocol >= NPROTO);
251
252 kfree(rtnl_msg_handlers[protocol]);
253 rtnl_msg_handlers[protocol] = NULL;
254 }
255
256 EXPORT_SYMBOL_GPL(rtnl_unregister_all);
257
258 static LIST_HEAD(link_ops);
259
260 /**
261 * __rtnl_link_register - Register rtnl_link_ops with rtnetlink.
262 * @ops: struct rtnl_link_ops * to register
263 *
264 * The caller must hold the rtnl_mutex. This function should be used
265 * by drivers that create devices during module initialization. It
266 * must be called before registering the devices.
267 *
268 * Returns 0 on success or a negative error code.
269 */
270 int __rtnl_link_register(struct rtnl_link_ops *ops)
271 {
272 if (!ops->dellink)
273 ops->dellink = unregister_netdevice;
274
275 list_add_tail(&ops->list, &link_ops);
276 return 0;
277 }
278
279 EXPORT_SYMBOL_GPL(__rtnl_link_register);
280
281 /**
282 * rtnl_link_register - Register rtnl_link_ops with rtnetlink.
283 * @ops: struct rtnl_link_ops * to register
284 *
285 * Returns 0 on success or a negative error code.
286 */
287 int rtnl_link_register(struct rtnl_link_ops *ops)
288 {
289 int err;
290
291 rtnl_lock();
292 err = __rtnl_link_register(ops);
293 rtnl_unlock();
294 return err;
295 }
296
297 EXPORT_SYMBOL_GPL(rtnl_link_register);
298
299 /**
300 * __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
301 * @ops: struct rtnl_link_ops * to unregister
302 *
303 * The caller must hold the rtnl_mutex.
304 */
305 void __rtnl_link_unregister(struct rtnl_link_ops *ops)
306 {
307 struct net_device *dev, *n;
308 struct net *net;
309
310 for_each_net(net) {
311 for_each_netdev_safe(net, dev, n) {
312 if (dev->rtnl_link_ops == ops)
313 ops->dellink(dev);
314 }
315 }
316 list_del(&ops->list);
317 }
318
319 EXPORT_SYMBOL_GPL(__rtnl_link_unregister);
320
321 /**
322 * rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
323 * @ops: struct rtnl_link_ops * to unregister
324 */
325 void rtnl_link_unregister(struct rtnl_link_ops *ops)
326 {
327 rtnl_lock();
328 __rtnl_link_unregister(ops);
329 rtnl_unlock();
330 }
331
332 EXPORT_SYMBOL_GPL(rtnl_link_unregister);
333
334 static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind)
335 {
336 const struct rtnl_link_ops *ops;
337
338 list_for_each_entry(ops, &link_ops, list) {
339 if (!strcmp(ops->kind, kind))
340 return ops;
341 }
342 return NULL;
343 }
344
345 static size_t rtnl_link_get_size(const struct net_device *dev)
346 {
347 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
348 size_t size;
349
350 if (!ops)
351 return 0;
352
353 size = nlmsg_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */
354 nlmsg_total_size(strlen(ops->kind) + 1); /* IFLA_INFO_KIND */
355
356 if (ops->get_size)
357 /* IFLA_INFO_DATA + nested data */
358 size += nlmsg_total_size(sizeof(struct nlattr)) +
359 ops->get_size(dev);
360
361 if (ops->get_xstats_size)
362 size += ops->get_xstats_size(dev); /* IFLA_INFO_XSTATS */
363
364 return size;
365 }
366
367 static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev)
368 {
369 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
370 struct nlattr *linkinfo, *data;
371 int err = -EMSGSIZE;
372
373 linkinfo = nla_nest_start(skb, IFLA_LINKINFO);
374 if (linkinfo == NULL)
375 goto out;
376
377 if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0)
378 goto err_cancel_link;
379 if (ops->fill_xstats) {
380 err = ops->fill_xstats(skb, dev);
381 if (err < 0)
382 goto err_cancel_link;
383 }
384 if (ops->fill_info) {
385 data = nla_nest_start(skb, IFLA_INFO_DATA);
386 if (data == NULL)
387 goto err_cancel_link;
388 err = ops->fill_info(skb, dev);
389 if (err < 0)
390 goto err_cancel_data;
391 nla_nest_end(skb, data);
392 }
393
394 nla_nest_end(skb, linkinfo);
395 return 0;
396
397 err_cancel_data:
398 nla_nest_cancel(skb, data);
399 err_cancel_link:
400 nla_nest_cancel(skb, linkinfo);
401 out:
402 return err;
403 }
404
405 static const int rtm_min[RTM_NR_FAMILIES] =
406 {
407 [RTM_FAM(RTM_NEWLINK)] = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
408 [RTM_FAM(RTM_NEWADDR)] = NLMSG_LENGTH(sizeof(struct ifaddrmsg)),
409 [RTM_FAM(RTM_NEWROUTE)] = NLMSG_LENGTH(sizeof(struct rtmsg)),
410 [RTM_FAM(RTM_NEWRULE)] = NLMSG_LENGTH(sizeof(struct fib_rule_hdr)),
411 [RTM_FAM(RTM_NEWQDISC)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
412 [RTM_FAM(RTM_NEWTCLASS)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
413 [RTM_FAM(RTM_NEWTFILTER)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
414 [RTM_FAM(RTM_NEWACTION)] = NLMSG_LENGTH(sizeof(struct tcamsg)),
415 [RTM_FAM(RTM_GETMULTICAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
416 [RTM_FAM(RTM_GETANYCAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
417 };
418
419 static const int rta_max[RTM_NR_FAMILIES] =
420 {
421 [RTM_FAM(RTM_NEWLINK)] = IFLA_MAX,
422 [RTM_FAM(RTM_NEWADDR)] = IFA_MAX,
423 [RTM_FAM(RTM_NEWROUTE)] = RTA_MAX,
424 [RTM_FAM(RTM_NEWRULE)] = FRA_MAX,
425 [RTM_FAM(RTM_NEWQDISC)] = TCA_MAX,
426 [RTM_FAM(RTM_NEWTCLASS)] = TCA_MAX,
427 [RTM_FAM(RTM_NEWTFILTER)] = TCA_MAX,
428 [RTM_FAM(RTM_NEWACTION)] = TCAA_MAX,
429 };
430
431 void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const void *data)
432 {
433 struct rtattr *rta;
434 int size = RTA_LENGTH(attrlen);
435
436 rta = (struct rtattr*)skb_put(skb, RTA_ALIGN(size));
437 rta->rta_type = attrtype;
438 rta->rta_len = size;
439 memcpy(RTA_DATA(rta), data, attrlen);
440 memset(RTA_DATA(rta) + attrlen, 0, RTA_ALIGN(size) - size);
441 }
442
443 size_t rtattr_strlcpy(char *dest, const struct rtattr *rta, size_t size)
444 {
445 size_t ret = RTA_PAYLOAD(rta);
446 char *src = RTA_DATA(rta);
447
448 if (ret > 0 && src[ret - 1] == '\0')
449 ret--;
450 if (size > 0) {
451 size_t len = (ret >= size) ? size - 1 : ret;
452 memset(dest, 0, size);
453 memcpy(dest, src, len);
454 }
455 return ret;
456 }
457
458 int rtnetlink_send(struct sk_buff *skb, u32 pid, unsigned group, int echo)
459 {
460 int err = 0;
461
462 NETLINK_CB(skb).dst_group = group;
463 if (echo)
464 atomic_inc(&skb->users);
465 netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL);
466 if (echo)
467 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
468 return err;
469 }
470
471 int rtnl_unicast(struct sk_buff *skb, u32 pid)
472 {
473 return nlmsg_unicast(rtnl, skb, pid);
474 }
475
476 int rtnl_notify(struct sk_buff *skb, u32 pid, u32 group,
477 struct nlmsghdr *nlh, gfp_t flags)
478 {
479 int report = 0;
480
481 if (nlh)
482 report = nlmsg_report(nlh);
483
484 return nlmsg_notify(rtnl, skb, pid, group, report, flags);
485 }
486
487 void rtnl_set_sk_err(u32 group, int error)
488 {
489 netlink_set_err(rtnl, 0, group, error);
490 }
491
492 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics)
493 {
494 struct nlattr *mx;
495 int i, valid = 0;
496
497 mx = nla_nest_start(skb, RTA_METRICS);
498 if (mx == NULL)
499 return -ENOBUFS;
500
501 for (i = 0; i < RTAX_MAX; i++) {
502 if (metrics[i]) {
503 valid++;
504 NLA_PUT_U32(skb, i+1, metrics[i]);
505 }
506 }
507
508 if (!valid) {
509 nla_nest_cancel(skb, mx);
510 return 0;
511 }
512
513 return nla_nest_end(skb, mx);
514
515 nla_put_failure:
516 return nla_nest_cancel(skb, mx);
517 }
518
519 int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id,
520 u32 ts, u32 tsage, long expires, u32 error)
521 {
522 struct rta_cacheinfo ci = {
523 .rta_lastuse = jiffies_to_clock_t(jiffies - dst->lastuse),
524 .rta_used = dst->__use,
525 .rta_clntref = atomic_read(&(dst->__refcnt)),
526 .rta_error = error,
527 .rta_id = id,
528 .rta_ts = ts,
529 .rta_tsage = tsage,
530 };
531
532 if (expires)
533 ci.rta_expires = jiffies_to_clock_t(expires);
534
535 return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci);
536 }
537
538 EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo);
539
540 static void set_operstate(struct net_device *dev, unsigned char transition)
541 {
542 unsigned char operstate = dev->operstate;
543
544 switch(transition) {
545 case IF_OPER_UP:
546 if ((operstate == IF_OPER_DORMANT ||
547 operstate == IF_OPER_UNKNOWN) &&
548 !netif_dormant(dev))
549 operstate = IF_OPER_UP;
550 break;
551
552 case IF_OPER_DORMANT:
553 if (operstate == IF_OPER_UP ||
554 operstate == IF_OPER_UNKNOWN)
555 operstate = IF_OPER_DORMANT;
556 break;
557 }
558
559 if (dev->operstate != operstate) {
560 write_lock_bh(&dev_base_lock);
561 dev->operstate = operstate;
562 write_unlock_bh(&dev_base_lock);
563 netdev_state_change(dev);
564 }
565 }
566
567 static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
568 struct net_device_stats *b)
569 {
570 a->rx_packets = b->rx_packets;
571 a->tx_packets = b->tx_packets;
572 a->rx_bytes = b->rx_bytes;
573 a->tx_bytes = b->tx_bytes;
574 a->rx_errors = b->rx_errors;
575 a->tx_errors = b->tx_errors;
576 a->rx_dropped = b->rx_dropped;
577 a->tx_dropped = b->tx_dropped;
578
579 a->multicast = b->multicast;
580 a->collisions = b->collisions;
581
582 a->rx_length_errors = b->rx_length_errors;
583 a->rx_over_errors = b->rx_over_errors;
584 a->rx_crc_errors = b->rx_crc_errors;
585 a->rx_frame_errors = b->rx_frame_errors;
586 a->rx_fifo_errors = b->rx_fifo_errors;
587 a->rx_missed_errors = b->rx_missed_errors;
588
589 a->tx_aborted_errors = b->tx_aborted_errors;
590 a->tx_carrier_errors = b->tx_carrier_errors;
591 a->tx_fifo_errors = b->tx_fifo_errors;
592 a->tx_heartbeat_errors = b->tx_heartbeat_errors;
593 a->tx_window_errors = b->tx_window_errors;
594
595 a->rx_compressed = b->rx_compressed;
596 a->tx_compressed = b->tx_compressed;
597 };
598
599 static inline size_t if_nlmsg_size(const struct net_device *dev)
600 {
601 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
602 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
603 + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */
604 + nla_total_size(sizeof(struct rtnl_link_ifmap))
605 + nla_total_size(sizeof(struct rtnl_link_stats))
606 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
607 + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */
608 + nla_total_size(4) /* IFLA_TXQLEN */
609 + nla_total_size(4) /* IFLA_WEIGHT */
610 + nla_total_size(4) /* IFLA_MTU */
611 + nla_total_size(4) /* IFLA_LINK */
612 + nla_total_size(4) /* IFLA_MASTER */
613 + nla_total_size(1) /* IFLA_OPERSTATE */
614 + nla_total_size(1) /* IFLA_LINKMODE */
615 + rtnl_link_get_size(dev); /* IFLA_LINKINFO */
616 }
617
618 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
619 int type, u32 pid, u32 seq, u32 change,
620 unsigned int flags)
621 {
622 struct ifinfomsg *ifm;
623 struct nlmsghdr *nlh;
624
625 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
626 if (nlh == NULL)
627 return -EMSGSIZE;
628
629 ifm = nlmsg_data(nlh);
630 ifm->ifi_family = AF_UNSPEC;
631 ifm->__ifi_pad = 0;
632 ifm->ifi_type = dev->type;
633 ifm->ifi_index = dev->ifindex;
634 ifm->ifi_flags = dev_get_flags(dev);
635 ifm->ifi_change = change;
636
637 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
638 NLA_PUT_U32(skb, IFLA_TXQLEN, dev->tx_queue_len);
639 NLA_PUT_U8(skb, IFLA_OPERSTATE,
640 netif_running(dev) ? dev->operstate : IF_OPER_DOWN);
641 NLA_PUT_U8(skb, IFLA_LINKMODE, dev->link_mode);
642 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
643
644 if (dev->ifindex != dev->iflink)
645 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
646
647 if (dev->master)
648 NLA_PUT_U32(skb, IFLA_MASTER, dev->master->ifindex);
649
650 if (dev->qdisc_sleeping)
651 NLA_PUT_STRING(skb, IFLA_QDISC, dev->qdisc_sleeping->ops->id);
652
653 if (1) {
654 struct rtnl_link_ifmap map = {
655 .mem_start = dev->mem_start,
656 .mem_end = dev->mem_end,
657 .base_addr = dev->base_addr,
658 .irq = dev->irq,
659 .dma = dev->dma,
660 .port = dev->if_port,
661 };
662 NLA_PUT(skb, IFLA_MAP, sizeof(map), &map);
663 }
664
665 if (dev->addr_len) {
666 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
667 NLA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast);
668 }
669
670 if (dev->get_stats) {
671 struct net_device_stats *stats = dev->get_stats(dev);
672 if (stats) {
673 struct nlattr *attr;
674
675 attr = nla_reserve(skb, IFLA_STATS,
676 sizeof(struct rtnl_link_stats));
677 if (attr == NULL)
678 goto nla_put_failure;
679
680 copy_rtnl_link_stats(nla_data(attr), stats);
681 }
682 }
683
684 if (dev->rtnl_link_ops) {
685 if (rtnl_link_fill(skb, dev) < 0)
686 goto nla_put_failure;
687 }
688
689 return nlmsg_end(skb, nlh);
690
691 nla_put_failure:
692 nlmsg_cancel(skb, nlh);
693 return -EMSGSIZE;
694 }
695
696 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
697 {
698 struct net *net = skb->sk->sk_net;
699 int idx;
700 int s_idx = cb->args[0];
701 struct net_device *dev;
702
703 idx = 0;
704 for_each_netdev(net, dev) {
705 if (idx < s_idx)
706 goto cont;
707 if (rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK,
708 NETLINK_CB(cb->skb).pid,
709 cb->nlh->nlmsg_seq, 0, NLM_F_MULTI) <= 0)
710 break;
711 cont:
712 idx++;
713 }
714 cb->args[0] = idx;
715
716 return skb->len;
717 }
718
719 const struct nla_policy ifla_policy[IFLA_MAX+1] = {
720 [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 },
721 [IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
722 [IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
723 [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) },
724 [IFLA_MTU] = { .type = NLA_U32 },
725 [IFLA_TXQLEN] = { .type = NLA_U32 },
726 [IFLA_WEIGHT] = { .type = NLA_U32 },
727 [IFLA_OPERSTATE] = { .type = NLA_U8 },
728 [IFLA_LINKMODE] = { .type = NLA_U8 },
729 [IFLA_NET_NS_PID] = { .type = NLA_U32 },
730 };
731
732 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
733 [IFLA_INFO_KIND] = { .type = NLA_STRING },
734 [IFLA_INFO_DATA] = { .type = NLA_NESTED },
735 };
736
737 static struct net *get_net_ns_by_pid(pid_t pid)
738 {
739 struct task_struct *tsk;
740 struct net *net;
741
742 /* Lookup the network namespace */
743 net = ERR_PTR(-ESRCH);
744 rcu_read_lock();
745 tsk = find_task_by_pid(pid);
746 if (tsk) {
747 task_lock(tsk);
748 if (tsk->nsproxy)
749 net = get_net(tsk->nsproxy->net_ns);
750 task_unlock(tsk);
751 }
752 rcu_read_unlock();
753 return net;
754 }
755
756 static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm,
757 struct nlattr **tb, char *ifname, int modified)
758 {
759 int send_addr_notify = 0;
760 int err;
761
762 if (tb[IFLA_NET_NS_PID]) {
763 struct net *net;
764 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID]));
765 if (IS_ERR(net)) {
766 err = PTR_ERR(net);
767 goto errout;
768 }
769 err = dev_change_net_namespace(dev, net, ifname);
770 put_net(net);
771 if (err)
772 goto errout;
773 modified = 1;
774 }
775
776 if (tb[IFLA_MAP]) {
777 struct rtnl_link_ifmap *u_map;
778 struct ifmap k_map;
779
780 if (!dev->set_config) {
781 err = -EOPNOTSUPP;
782 goto errout;
783 }
784
785 if (!netif_device_present(dev)) {
786 err = -ENODEV;
787 goto errout;
788 }
789
790 u_map = nla_data(tb[IFLA_MAP]);
791 k_map.mem_start = (unsigned long) u_map->mem_start;
792 k_map.mem_end = (unsigned long) u_map->mem_end;
793 k_map.base_addr = (unsigned short) u_map->base_addr;
794 k_map.irq = (unsigned char) u_map->irq;
795 k_map.dma = (unsigned char) u_map->dma;
796 k_map.port = (unsigned char) u_map->port;
797
798 err = dev->set_config(dev, &k_map);
799 if (err < 0)
800 goto errout;
801
802 modified = 1;
803 }
804
805 if (tb[IFLA_ADDRESS]) {
806 struct sockaddr *sa;
807 int len;
808
809 if (!dev->set_mac_address) {
810 err = -EOPNOTSUPP;
811 goto errout;
812 }
813
814 if (!netif_device_present(dev)) {
815 err = -ENODEV;
816 goto errout;
817 }
818
819 len = sizeof(sa_family_t) + dev->addr_len;
820 sa = kmalloc(len, GFP_KERNEL);
821 if (!sa) {
822 err = -ENOMEM;
823 goto errout;
824 }
825 sa->sa_family = dev->type;
826 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
827 dev->addr_len);
828 err = dev->set_mac_address(dev, sa);
829 kfree(sa);
830 if (err)
831 goto errout;
832 send_addr_notify = 1;
833 modified = 1;
834 }
835
836 if (tb[IFLA_MTU]) {
837 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
838 if (err < 0)
839 goto errout;
840 modified = 1;
841 }
842
843 /*
844 * Interface selected by interface index but interface
845 * name provided implies that a name change has been
846 * requested.
847 */
848 if (ifm->ifi_index > 0 && ifname[0]) {
849 err = dev_change_name(dev, ifname);
850 if (err < 0)
851 goto errout;
852 modified = 1;
853 }
854
855 if (tb[IFLA_BROADCAST]) {
856 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
857 send_addr_notify = 1;
858 }
859
860 if (ifm->ifi_flags || ifm->ifi_change) {
861 unsigned int flags = ifm->ifi_flags;
862
863 /* bugwards compatibility: ifi_change == 0 is treated as ~0 */
864 if (ifm->ifi_change)
865 flags = (flags & ifm->ifi_change) |
866 (dev->flags & ~ifm->ifi_change);
867 dev_change_flags(dev, flags);
868 }
869
870 if (tb[IFLA_TXQLEN])
871 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
872
873 if (tb[IFLA_OPERSTATE])
874 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
875
876 if (tb[IFLA_LINKMODE]) {
877 write_lock_bh(&dev_base_lock);
878 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
879 write_unlock_bh(&dev_base_lock);
880 }
881
882 err = 0;
883
884 errout:
885 if (err < 0 && modified && net_ratelimit())
886 printk(KERN_WARNING "A link change request failed with "
887 "some changes comitted already. Interface %s may "
888 "have been left with an inconsistent configuration, "
889 "please check.\n", dev->name);
890
891 if (send_addr_notify)
892 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
893 return err;
894 }
895
896 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
897 {
898 struct net *net = skb->sk->sk_net;
899 struct ifinfomsg *ifm;
900 struct net_device *dev;
901 int err;
902 struct nlattr *tb[IFLA_MAX+1];
903 char ifname[IFNAMSIZ];
904
905 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
906 if (err < 0)
907 goto errout;
908
909 if (tb[IFLA_IFNAME])
910 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
911 else
912 ifname[0] = '\0';
913
914 err = -EINVAL;
915 ifm = nlmsg_data(nlh);
916 if (ifm->ifi_index > 0)
917 dev = dev_get_by_index(net, ifm->ifi_index);
918 else if (tb[IFLA_IFNAME])
919 dev = dev_get_by_name(net, ifname);
920 else
921 goto errout;
922
923 if (dev == NULL) {
924 err = -ENODEV;
925 goto errout;
926 }
927
928 if (tb[IFLA_ADDRESS] &&
929 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
930 goto errout_dev;
931
932 if (tb[IFLA_BROADCAST] &&
933 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
934 goto errout_dev;
935
936 err = do_setlink(dev, ifm, tb, ifname, 0);
937 errout_dev:
938 dev_put(dev);
939 errout:
940 return err;
941 }
942
943 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
944 {
945 struct net *net = skb->sk->sk_net;
946 const struct rtnl_link_ops *ops;
947 struct net_device *dev;
948 struct ifinfomsg *ifm;
949 char ifname[IFNAMSIZ];
950 struct nlattr *tb[IFLA_MAX+1];
951 int err;
952
953 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
954 if (err < 0)
955 return err;
956
957 if (tb[IFLA_IFNAME])
958 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
959
960 ifm = nlmsg_data(nlh);
961 if (ifm->ifi_index > 0)
962 dev = __dev_get_by_index(net, ifm->ifi_index);
963 else if (tb[IFLA_IFNAME])
964 dev = __dev_get_by_name(net, ifname);
965 else
966 return -EINVAL;
967
968 if (!dev)
969 return -ENODEV;
970
971 ops = dev->rtnl_link_ops;
972 if (!ops)
973 return -EOPNOTSUPP;
974
975 ops->dellink(dev);
976 return 0;
977 }
978
979 struct net_device *rtnl_create_link(struct net *net, char *ifname,
980 const struct rtnl_link_ops *ops, struct nlattr *tb[])
981 {
982 int err;
983 struct net_device *dev;
984
985 err = -ENOMEM;
986 dev = alloc_netdev(ops->priv_size, ifname, ops->setup);
987 if (!dev)
988 goto err;
989
990 if (strchr(dev->name, '%')) {
991 err = dev_alloc_name(dev, dev->name);
992 if (err < 0)
993 goto err_free;
994 }
995
996 dev->nd_net = net;
997 dev->rtnl_link_ops = ops;
998
999 if (tb[IFLA_MTU])
1000 dev->mtu = nla_get_u32(tb[IFLA_MTU]);
1001 if (tb[IFLA_ADDRESS])
1002 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]),
1003 nla_len(tb[IFLA_ADDRESS]));
1004 if (tb[IFLA_BROADCAST])
1005 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]),
1006 nla_len(tb[IFLA_BROADCAST]));
1007 if (tb[IFLA_TXQLEN])
1008 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
1009 if (tb[IFLA_OPERSTATE])
1010 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
1011 if (tb[IFLA_LINKMODE])
1012 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
1013
1014 return dev;
1015
1016 err_free:
1017 free_netdev(dev);
1018 err:
1019 return ERR_PTR(err);
1020 }
1021
1022 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
1023 {
1024 struct net *net = skb->sk->sk_net;
1025 const struct rtnl_link_ops *ops;
1026 struct net_device *dev;
1027 struct ifinfomsg *ifm;
1028 char kind[MODULE_NAME_LEN];
1029 char ifname[IFNAMSIZ];
1030 struct nlattr *tb[IFLA_MAX+1];
1031 struct nlattr *linkinfo[IFLA_INFO_MAX+1];
1032 int err;
1033
1034 #ifdef CONFIG_KMOD
1035 replay:
1036 #endif
1037 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1038 if (err < 0)
1039 return err;
1040
1041 if (tb[IFLA_IFNAME])
1042 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1043 else
1044 ifname[0] = '\0';
1045
1046 ifm = nlmsg_data(nlh);
1047 if (ifm->ifi_index > 0)
1048 dev = __dev_get_by_index(net, ifm->ifi_index);
1049 else if (ifname[0])
1050 dev = __dev_get_by_name(net, ifname);
1051 else
1052 dev = NULL;
1053
1054 if (tb[IFLA_LINKINFO]) {
1055 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX,
1056 tb[IFLA_LINKINFO], ifla_info_policy);
1057 if (err < 0)
1058 return err;
1059 } else
1060 memset(linkinfo, 0, sizeof(linkinfo));
1061
1062 if (linkinfo[IFLA_INFO_KIND]) {
1063 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind));
1064 ops = rtnl_link_ops_get(kind);
1065 } else {
1066 kind[0] = '\0';
1067 ops = NULL;
1068 }
1069
1070 if (1) {
1071 struct nlattr *attr[ops ? ops->maxtype + 1 : 0], **data = NULL;
1072
1073 if (ops) {
1074 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
1075 err = nla_parse_nested(attr, ops->maxtype,
1076 linkinfo[IFLA_INFO_DATA],
1077 ops->policy);
1078 if (err < 0)
1079 return err;
1080 data = attr;
1081 }
1082 if (ops->validate) {
1083 err = ops->validate(tb, data);
1084 if (err < 0)
1085 return err;
1086 }
1087 }
1088
1089 if (dev) {
1090 int modified = 0;
1091
1092 if (nlh->nlmsg_flags & NLM_F_EXCL)
1093 return -EEXIST;
1094 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1095 return -EOPNOTSUPP;
1096
1097 if (linkinfo[IFLA_INFO_DATA]) {
1098 if (!ops || ops != dev->rtnl_link_ops ||
1099 !ops->changelink)
1100 return -EOPNOTSUPP;
1101
1102 err = ops->changelink(dev, tb, data);
1103 if (err < 0)
1104 return err;
1105 modified = 1;
1106 }
1107
1108 return do_setlink(dev, ifm, tb, ifname, modified);
1109 }
1110
1111 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
1112 return -ENODEV;
1113
1114 if (ifm->ifi_index || ifm->ifi_flags || ifm->ifi_change)
1115 return -EOPNOTSUPP;
1116 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO])
1117 return -EOPNOTSUPP;
1118
1119 if (!ops) {
1120 #ifdef CONFIG_KMOD
1121 if (kind[0]) {
1122 __rtnl_unlock();
1123 request_module("rtnl-link-%s", kind);
1124 rtnl_lock();
1125 ops = rtnl_link_ops_get(kind);
1126 if (ops)
1127 goto replay;
1128 }
1129 #endif
1130 return -EOPNOTSUPP;
1131 }
1132
1133 if (!ifname[0])
1134 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
1135
1136 dev = rtnl_create_link(net, ifname, ops, tb);
1137
1138 if (IS_ERR(dev))
1139 err = PTR_ERR(dev);
1140 else if (ops->newlink)
1141 err = ops->newlink(dev, tb, data);
1142 else
1143 err = register_netdevice(dev);
1144
1145 if (err < 0 && !IS_ERR(dev))
1146 free_netdev(dev);
1147 return err;
1148 }
1149 }
1150
1151 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
1152 {
1153 struct net *net = skb->sk->sk_net;
1154 struct ifinfomsg *ifm;
1155 struct nlattr *tb[IFLA_MAX+1];
1156 struct net_device *dev = NULL;
1157 struct sk_buff *nskb;
1158 int err;
1159
1160 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1161 if (err < 0)
1162 return err;
1163
1164 ifm = nlmsg_data(nlh);
1165 if (ifm->ifi_index > 0) {
1166 dev = dev_get_by_index(net, ifm->ifi_index);
1167 if (dev == NULL)
1168 return -ENODEV;
1169 } else
1170 return -EINVAL;
1171
1172 nskb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL);
1173 if (nskb == NULL) {
1174 err = -ENOBUFS;
1175 goto errout;
1176 }
1177
1178 err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).pid,
1179 nlh->nlmsg_seq, 0, 0);
1180 if (err < 0) {
1181 /* -EMSGSIZE implies BUG in if_nlmsg_size */
1182 WARN_ON(err == -EMSGSIZE);
1183 kfree_skb(nskb);
1184 goto errout;
1185 }
1186 err = rtnl_unicast(nskb, NETLINK_CB(skb).pid);
1187 errout:
1188 dev_put(dev);
1189
1190 return err;
1191 }
1192
1193 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
1194 {
1195 int idx;
1196 int s_idx = cb->family;
1197
1198 if (s_idx == 0)
1199 s_idx = 1;
1200 for (idx=1; idx<NPROTO; idx++) {
1201 int type = cb->nlh->nlmsg_type-RTM_BASE;
1202 if (idx < s_idx || idx == PF_PACKET)
1203 continue;
1204 if (rtnl_msg_handlers[idx] == NULL ||
1205 rtnl_msg_handlers[idx][type].dumpit == NULL)
1206 continue;
1207 if (idx > s_idx)
1208 memset(&cb->args[0], 0, sizeof(cb->args));
1209 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb))
1210 break;
1211 }
1212 cb->family = idx;
1213
1214 return skb->len;
1215 }
1216
1217 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change)
1218 {
1219 struct sk_buff *skb;
1220 int err = -ENOBUFS;
1221
1222 skb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL);
1223 if (skb == NULL)
1224 goto errout;
1225
1226 err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0);
1227 if (err < 0) {
1228 /* -EMSGSIZE implies BUG in if_nlmsg_size() */
1229 WARN_ON(err == -EMSGSIZE);
1230 kfree_skb(skb);
1231 goto errout;
1232 }
1233 err = rtnl_notify(skb, 0, RTNLGRP_LINK, NULL, GFP_KERNEL);
1234 errout:
1235 if (err < 0)
1236 rtnl_set_sk_err(RTNLGRP_LINK, err);
1237 }
1238
1239 /* Protected by RTNL sempahore. */
1240 static struct rtattr **rta_buf;
1241 static int rtattr_max;
1242
1243 /* Process one rtnetlink message. */
1244
1245 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
1246 {
1247 rtnl_doit_func doit;
1248 int sz_idx, kind;
1249 int min_len;
1250 int family;
1251 int type;
1252 int err;
1253
1254 type = nlh->nlmsg_type;
1255 if (type > RTM_MAX)
1256 return -EOPNOTSUPP;
1257
1258 type -= RTM_BASE;
1259
1260 /* All the messages must have at least 1 byte length */
1261 if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg)))
1262 return 0;
1263
1264 family = ((struct rtgenmsg*)NLMSG_DATA(nlh))->rtgen_family;
1265 if (family >= NPROTO)
1266 return -EAFNOSUPPORT;
1267
1268 sz_idx = type>>2;
1269 kind = type&3;
1270
1271 if (kind != 2 && security_netlink_recv(skb, CAP_NET_ADMIN))
1272 return -EPERM;
1273
1274 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
1275 rtnl_dumpit_func dumpit;
1276
1277 dumpit = rtnl_get_dumpit(family, type);
1278 if (dumpit == NULL)
1279 return -EOPNOTSUPP;
1280
1281 __rtnl_unlock();
1282 err = netlink_dump_start(rtnl, skb, nlh, dumpit, NULL);
1283 rtnl_lock();
1284 return err;
1285 }
1286
1287 memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *)));
1288
1289 min_len = rtm_min[sz_idx];
1290 if (nlh->nlmsg_len < min_len)
1291 return -EINVAL;
1292
1293 if (nlh->nlmsg_len > min_len) {
1294 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
1295 struct rtattr *attr = (void*)nlh + NLMSG_ALIGN(min_len);
1296
1297 while (RTA_OK(attr, attrlen)) {
1298 unsigned flavor = attr->rta_type;
1299 if (flavor) {
1300 if (flavor > rta_max[sz_idx])
1301 return -EINVAL;
1302 rta_buf[flavor-1] = attr;
1303 }
1304 attr = RTA_NEXT(attr, attrlen);
1305 }
1306 }
1307
1308 doit = rtnl_get_doit(family, type);
1309 if (doit == NULL)
1310 return -EOPNOTSUPP;
1311
1312 return doit(skb, nlh, (void *)&rta_buf[0]);
1313 }
1314
1315 static void rtnetlink_rcv(struct sk_buff *skb)
1316 {
1317 rtnl_lock();
1318 netlink_rcv_skb(skb, &rtnetlink_rcv_msg);
1319 rtnl_unlock();
1320 }
1321
1322 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
1323 {
1324 struct net_device *dev = ptr;
1325
1326 if (dev->nd_net != &init_net)
1327 return NOTIFY_DONE;
1328
1329 switch (event) {
1330 case NETDEV_UNREGISTER:
1331 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);
1332 break;
1333 case NETDEV_REGISTER:
1334 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
1335 break;
1336 case NETDEV_UP:
1337 case NETDEV_DOWN:
1338 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
1339 break;
1340 case NETDEV_CHANGE:
1341 case NETDEV_GOING_DOWN:
1342 break;
1343 default:
1344 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
1345 break;
1346 }
1347 return NOTIFY_DONE;
1348 }
1349
1350 static struct notifier_block rtnetlink_dev_notifier = {
1351 .notifier_call = rtnetlink_event,
1352 };
1353
1354 void __init rtnetlink_init(void)
1355 {
1356 int i;
1357
1358 rtattr_max = 0;
1359 for (i = 0; i < ARRAY_SIZE(rta_max); i++)
1360 if (rta_max[i] > rtattr_max)
1361 rtattr_max = rta_max[i];
1362 rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL);
1363 if (!rta_buf)
1364 panic("rtnetlink_init: cannot allocate rta_buf\n");
1365
1366 rtnl = netlink_kernel_create(&init_net, NETLINK_ROUTE, RTNLGRP_MAX,
1367 rtnetlink_rcv, &rtnl_mutex, THIS_MODULE);
1368 if (rtnl == NULL)
1369 panic("rtnetlink_init: cannot initialize rtnetlink\n");
1370 netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV);
1371 register_netdevice_notifier(&rtnetlink_dev_notifier);
1372
1373 rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink, rtnl_dump_ifinfo);
1374 rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL);
1375 rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL);
1376 rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL);
1377
1378 rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all);
1379 rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all);
1380 }
1381
1382 EXPORT_SYMBOL(__rta_fill);
1383 EXPORT_SYMBOL(rtattr_strlcpy);
1384 EXPORT_SYMBOL(rtattr_parse);
1385 EXPORT_SYMBOL(__rtattr_parse_nested_compat);
1386 EXPORT_SYMBOL(rtnetlink_put_metrics);
1387 EXPORT_SYMBOL(rtnl_lock);
1388 EXPORT_SYMBOL(rtnl_trylock);
1389 EXPORT_SYMBOL(rtnl_unlock);
1390 EXPORT_SYMBOL(rtnl_unicast);
1391 EXPORT_SYMBOL(rtnl_notify);
1392 EXPORT_SYMBOL(rtnl_set_sk_err);
1393 EXPORT_SYMBOL(rtnl_create_link);
1394 EXPORT_SYMBOL(ifla_policy);
WRT350N Kernel Patches