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[NET] NETNS: Omit sock->sk_net without CONFIG_NET_NS.
[mirror_ubuntu-bionic-kernel.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
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 static void set_operstate(struct net_device *dev, unsigned char transition)
508 {
509 unsigned char operstate = dev->operstate;
510
511 switch(transition) {
512 case IF_OPER_UP:
513 if ((operstate == IF_OPER_DORMANT ||
514 operstate == IF_OPER_UNKNOWN) &&
515 !netif_dormant(dev))
516 operstate = IF_OPER_UP;
517 break;
518
519 case IF_OPER_DORMANT:
520 if (operstate == IF_OPER_UP ||
521 operstate == IF_OPER_UNKNOWN)
522 operstate = IF_OPER_DORMANT;
523 break;
524 }
525
526 if (dev->operstate != operstate) {
527 write_lock_bh(&dev_base_lock);
528 dev->operstate = operstate;
529 write_unlock_bh(&dev_base_lock);
530 netdev_state_change(dev);
531 }
532 }
533
534 static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
535 struct net_device_stats *b)
536 {
537 a->rx_packets = b->rx_packets;
538 a->tx_packets = b->tx_packets;
539 a->rx_bytes = b->rx_bytes;
540 a->tx_bytes = b->tx_bytes;
541 a->rx_errors = b->rx_errors;
542 a->tx_errors = b->tx_errors;
543 a->rx_dropped = b->rx_dropped;
544 a->tx_dropped = b->tx_dropped;
545
546 a->multicast = b->multicast;
547 a->collisions = b->collisions;
548
549 a->rx_length_errors = b->rx_length_errors;
550 a->rx_over_errors = b->rx_over_errors;
551 a->rx_crc_errors = b->rx_crc_errors;
552 a->rx_frame_errors = b->rx_frame_errors;
553 a->rx_fifo_errors = b->rx_fifo_errors;
554 a->rx_missed_errors = b->rx_missed_errors;
555
556 a->tx_aborted_errors = b->tx_aborted_errors;
557 a->tx_carrier_errors = b->tx_carrier_errors;
558 a->tx_fifo_errors = b->tx_fifo_errors;
559 a->tx_heartbeat_errors = b->tx_heartbeat_errors;
560 a->tx_window_errors = b->tx_window_errors;
561
562 a->rx_compressed = b->rx_compressed;
563 a->tx_compressed = b->tx_compressed;
564 };
565
566 static inline size_t if_nlmsg_size(const struct net_device *dev)
567 {
568 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
569 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
570 + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */
571 + nla_total_size(sizeof(struct rtnl_link_ifmap))
572 + nla_total_size(sizeof(struct rtnl_link_stats))
573 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
574 + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */
575 + nla_total_size(4) /* IFLA_TXQLEN */
576 + nla_total_size(4) /* IFLA_WEIGHT */
577 + nla_total_size(4) /* IFLA_MTU */
578 + nla_total_size(4) /* IFLA_LINK */
579 + nla_total_size(4) /* IFLA_MASTER */
580 + nla_total_size(1) /* IFLA_OPERSTATE */
581 + nla_total_size(1) /* IFLA_LINKMODE */
582 + rtnl_link_get_size(dev); /* IFLA_LINKINFO */
583 }
584
585 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
586 int type, u32 pid, u32 seq, u32 change,
587 unsigned int flags)
588 {
589 struct ifinfomsg *ifm;
590 struct nlmsghdr *nlh;
591
592 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
593 if (nlh == NULL)
594 return -EMSGSIZE;
595
596 ifm = nlmsg_data(nlh);
597 ifm->ifi_family = AF_UNSPEC;
598 ifm->__ifi_pad = 0;
599 ifm->ifi_type = dev->type;
600 ifm->ifi_index = dev->ifindex;
601 ifm->ifi_flags = dev_get_flags(dev);
602 ifm->ifi_change = change;
603
604 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
605 NLA_PUT_U32(skb, IFLA_TXQLEN, dev->tx_queue_len);
606 NLA_PUT_U8(skb, IFLA_OPERSTATE,
607 netif_running(dev) ? dev->operstate : IF_OPER_DOWN);
608 NLA_PUT_U8(skb, IFLA_LINKMODE, dev->link_mode);
609 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
610
611 if (dev->ifindex != dev->iflink)
612 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
613
614 if (dev->master)
615 NLA_PUT_U32(skb, IFLA_MASTER, dev->master->ifindex);
616
617 if (dev->qdisc_sleeping)
618 NLA_PUT_STRING(skb, IFLA_QDISC, dev->qdisc_sleeping->ops->id);
619
620 if (1) {
621 struct rtnl_link_ifmap map = {
622 .mem_start = dev->mem_start,
623 .mem_end = dev->mem_end,
624 .base_addr = dev->base_addr,
625 .irq = dev->irq,
626 .dma = dev->dma,
627 .port = dev->if_port,
628 };
629 NLA_PUT(skb, IFLA_MAP, sizeof(map), &map);
630 }
631
632 if (dev->addr_len) {
633 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
634 NLA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast);
635 }
636
637 if (dev->get_stats) {
638 struct net_device_stats *stats = dev->get_stats(dev);
639 if (stats) {
640 struct nlattr *attr;
641
642 attr = nla_reserve(skb, IFLA_STATS,
643 sizeof(struct rtnl_link_stats));
644 if (attr == NULL)
645 goto nla_put_failure;
646
647 copy_rtnl_link_stats(nla_data(attr), stats);
648 }
649 }
650
651 if (dev->rtnl_link_ops) {
652 if (rtnl_link_fill(skb, dev) < 0)
653 goto nla_put_failure;
654 }
655
656 return nlmsg_end(skb, nlh);
657
658 nla_put_failure:
659 nlmsg_cancel(skb, nlh);
660 return -EMSGSIZE;
661 }
662
663 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
664 {
665 struct net *net = sock_net(skb->sk);
666 int idx;
667 int s_idx = cb->args[0];
668 struct net_device *dev;
669
670 idx = 0;
671 for_each_netdev(net, dev) {
672 if (idx < s_idx)
673 goto cont;
674 if (rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK,
675 NETLINK_CB(cb->skb).pid,
676 cb->nlh->nlmsg_seq, 0, NLM_F_MULTI) <= 0)
677 break;
678 cont:
679 idx++;
680 }
681 cb->args[0] = idx;
682
683 return skb->len;
684 }
685
686 const struct nla_policy ifla_policy[IFLA_MAX+1] = {
687 [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 },
688 [IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
689 [IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
690 [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) },
691 [IFLA_MTU] = { .type = NLA_U32 },
692 [IFLA_LINK] = { .type = NLA_U32 },
693 [IFLA_TXQLEN] = { .type = NLA_U32 },
694 [IFLA_WEIGHT] = { .type = NLA_U32 },
695 [IFLA_OPERSTATE] = { .type = NLA_U8 },
696 [IFLA_LINKMODE] = { .type = NLA_U8 },
697 [IFLA_LINKINFO] = { .type = NLA_NESTED },
698 [IFLA_NET_NS_PID] = { .type = NLA_U32 },
699 };
700
701 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
702 [IFLA_INFO_KIND] = { .type = NLA_STRING },
703 [IFLA_INFO_DATA] = { .type = NLA_NESTED },
704 };
705
706 static struct net *get_net_ns_by_pid(pid_t pid)
707 {
708 struct task_struct *tsk;
709 struct net *net;
710
711 /* Lookup the network namespace */
712 net = ERR_PTR(-ESRCH);
713 rcu_read_lock();
714 tsk = find_task_by_vpid(pid);
715 if (tsk) {
716 struct nsproxy *nsproxy;
717 nsproxy = task_nsproxy(tsk);
718 if (nsproxy)
719 net = get_net(nsproxy->net_ns);
720 }
721 rcu_read_unlock();
722 return net;
723 }
724
725 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[])
726 {
727 if (dev) {
728 if (tb[IFLA_ADDRESS] &&
729 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
730 return -EINVAL;
731
732 if (tb[IFLA_BROADCAST] &&
733 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
734 return -EINVAL;
735 }
736
737 return 0;
738 }
739
740 static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm,
741 struct nlattr **tb, char *ifname, int modified)
742 {
743 int send_addr_notify = 0;
744 int err;
745
746 if (tb[IFLA_NET_NS_PID]) {
747 struct net *net;
748 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID]));
749 if (IS_ERR(net)) {
750 err = PTR_ERR(net);
751 goto errout;
752 }
753 err = dev_change_net_namespace(dev, net, ifname);
754 put_net(net);
755 if (err)
756 goto errout;
757 modified = 1;
758 }
759
760 if (tb[IFLA_MAP]) {
761 struct rtnl_link_ifmap *u_map;
762 struct ifmap k_map;
763
764 if (!dev->set_config) {
765 err = -EOPNOTSUPP;
766 goto errout;
767 }
768
769 if (!netif_device_present(dev)) {
770 err = -ENODEV;
771 goto errout;
772 }
773
774 u_map = nla_data(tb[IFLA_MAP]);
775 k_map.mem_start = (unsigned long) u_map->mem_start;
776 k_map.mem_end = (unsigned long) u_map->mem_end;
777 k_map.base_addr = (unsigned short) u_map->base_addr;
778 k_map.irq = (unsigned char) u_map->irq;
779 k_map.dma = (unsigned char) u_map->dma;
780 k_map.port = (unsigned char) u_map->port;
781
782 err = dev->set_config(dev, &k_map);
783 if (err < 0)
784 goto errout;
785
786 modified = 1;
787 }
788
789 if (tb[IFLA_ADDRESS]) {
790 struct sockaddr *sa;
791 int len;
792
793 if (!dev->set_mac_address) {
794 err = -EOPNOTSUPP;
795 goto errout;
796 }
797
798 if (!netif_device_present(dev)) {
799 err = -ENODEV;
800 goto errout;
801 }
802
803 len = sizeof(sa_family_t) + dev->addr_len;
804 sa = kmalloc(len, GFP_KERNEL);
805 if (!sa) {
806 err = -ENOMEM;
807 goto errout;
808 }
809 sa->sa_family = dev->type;
810 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
811 dev->addr_len);
812 err = dev->set_mac_address(dev, sa);
813 kfree(sa);
814 if (err)
815 goto errout;
816 send_addr_notify = 1;
817 modified = 1;
818 }
819
820 if (tb[IFLA_MTU]) {
821 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
822 if (err < 0)
823 goto errout;
824 modified = 1;
825 }
826
827 /*
828 * Interface selected by interface index but interface
829 * name provided implies that a name change has been
830 * requested.
831 */
832 if (ifm->ifi_index > 0 && ifname[0]) {
833 err = dev_change_name(dev, ifname);
834 if (err < 0)
835 goto errout;
836 modified = 1;
837 }
838
839 if (tb[IFLA_BROADCAST]) {
840 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
841 send_addr_notify = 1;
842 }
843
844 if (ifm->ifi_flags || ifm->ifi_change) {
845 unsigned int flags = ifm->ifi_flags;
846
847 /* bugwards compatibility: ifi_change == 0 is treated as ~0 */
848 if (ifm->ifi_change)
849 flags = (flags & ifm->ifi_change) |
850 (dev->flags & ~ifm->ifi_change);
851 dev_change_flags(dev, flags);
852 }
853
854 if (tb[IFLA_TXQLEN])
855 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
856
857 if (tb[IFLA_OPERSTATE])
858 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
859
860 if (tb[IFLA_LINKMODE]) {
861 write_lock_bh(&dev_base_lock);
862 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
863 write_unlock_bh(&dev_base_lock);
864 }
865
866 err = 0;
867
868 errout:
869 if (err < 0 && modified && net_ratelimit())
870 printk(KERN_WARNING "A link change request failed with "
871 "some changes comitted already. Interface %s may "
872 "have been left with an inconsistent configuration, "
873 "please check.\n", dev->name);
874
875 if (send_addr_notify)
876 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
877 return err;
878 }
879
880 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
881 {
882 struct net *net = sock_net(skb->sk);
883 struct ifinfomsg *ifm;
884 struct net_device *dev;
885 int err;
886 struct nlattr *tb[IFLA_MAX+1];
887 char ifname[IFNAMSIZ];
888
889 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
890 if (err < 0)
891 goto errout;
892
893 if (tb[IFLA_IFNAME])
894 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
895 else
896 ifname[0] = '\0';
897
898 err = -EINVAL;
899 ifm = nlmsg_data(nlh);
900 if (ifm->ifi_index > 0)
901 dev = dev_get_by_index(net, ifm->ifi_index);
902 else if (tb[IFLA_IFNAME])
903 dev = dev_get_by_name(net, ifname);
904 else
905 goto errout;
906
907 if (dev == NULL) {
908 err = -ENODEV;
909 goto errout;
910 }
911
912 if ((err = validate_linkmsg(dev, tb)) < 0)
913 goto errout_dev;
914
915 err = do_setlink(dev, ifm, tb, ifname, 0);
916 errout_dev:
917 dev_put(dev);
918 errout:
919 return err;
920 }
921
922 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
923 {
924 struct net *net = sock_net(skb->sk);
925 const struct rtnl_link_ops *ops;
926 struct net_device *dev;
927 struct ifinfomsg *ifm;
928 char ifname[IFNAMSIZ];
929 struct nlattr *tb[IFLA_MAX+1];
930 int err;
931
932 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
933 if (err < 0)
934 return err;
935
936 if (tb[IFLA_IFNAME])
937 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
938
939 ifm = nlmsg_data(nlh);
940 if (ifm->ifi_index > 0)
941 dev = __dev_get_by_index(net, ifm->ifi_index);
942 else if (tb[IFLA_IFNAME])
943 dev = __dev_get_by_name(net, ifname);
944 else
945 return -EINVAL;
946
947 if (!dev)
948 return -ENODEV;
949
950 ops = dev->rtnl_link_ops;
951 if (!ops)
952 return -EOPNOTSUPP;
953
954 ops->dellink(dev);
955 return 0;
956 }
957
958 struct net_device *rtnl_create_link(struct net *net, char *ifname,
959 const struct rtnl_link_ops *ops, struct nlattr *tb[])
960 {
961 int err;
962 struct net_device *dev;
963
964 err = -ENOMEM;
965 dev = alloc_netdev(ops->priv_size, ifname, ops->setup);
966 if (!dev)
967 goto err;
968
969 if (strchr(dev->name, '%')) {
970 err = dev_alloc_name(dev, dev->name);
971 if (err < 0)
972 goto err_free;
973 }
974
975 dev_net_set(dev, net);
976 dev->rtnl_link_ops = ops;
977
978 if (tb[IFLA_MTU])
979 dev->mtu = nla_get_u32(tb[IFLA_MTU]);
980 if (tb[IFLA_ADDRESS])
981 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]),
982 nla_len(tb[IFLA_ADDRESS]));
983 if (tb[IFLA_BROADCAST])
984 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]),
985 nla_len(tb[IFLA_BROADCAST]));
986 if (tb[IFLA_TXQLEN])
987 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
988 if (tb[IFLA_OPERSTATE])
989 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
990 if (tb[IFLA_LINKMODE])
991 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
992
993 return dev;
994
995 err_free:
996 free_netdev(dev);
997 err:
998 return ERR_PTR(err);
999 }
1000
1001 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
1002 {
1003 struct net *net = sock_net(skb->sk);
1004 const struct rtnl_link_ops *ops;
1005 struct net_device *dev;
1006 struct ifinfomsg *ifm;
1007 char kind[MODULE_NAME_LEN];
1008 char ifname[IFNAMSIZ];
1009 struct nlattr *tb[IFLA_MAX+1];
1010 struct nlattr *linkinfo[IFLA_INFO_MAX+1];
1011 int err;
1012
1013 #ifdef CONFIG_KMOD
1014 replay:
1015 #endif
1016 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1017 if (err < 0)
1018 return err;
1019
1020 if (tb[IFLA_IFNAME])
1021 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1022 else
1023 ifname[0] = '\0';
1024
1025 ifm = nlmsg_data(nlh);
1026 if (ifm->ifi_index > 0)
1027 dev = __dev_get_by_index(net, ifm->ifi_index);
1028 else if (ifname[0])
1029 dev = __dev_get_by_name(net, ifname);
1030 else
1031 dev = NULL;
1032
1033 if ((err = validate_linkmsg(dev, tb)) < 0)
1034 return err;
1035
1036 if (tb[IFLA_LINKINFO]) {
1037 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX,
1038 tb[IFLA_LINKINFO], ifla_info_policy);
1039 if (err < 0)
1040 return err;
1041 } else
1042 memset(linkinfo, 0, sizeof(linkinfo));
1043
1044 if (linkinfo[IFLA_INFO_KIND]) {
1045 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind));
1046 ops = rtnl_link_ops_get(kind);
1047 } else {
1048 kind[0] = '\0';
1049 ops = NULL;
1050 }
1051
1052 if (1) {
1053 struct nlattr *attr[ops ? ops->maxtype + 1 : 0], **data = NULL;
1054
1055 if (ops) {
1056 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
1057 err = nla_parse_nested(attr, ops->maxtype,
1058 linkinfo[IFLA_INFO_DATA],
1059 ops->policy);
1060 if (err < 0)
1061 return err;
1062 data = attr;
1063 }
1064 if (ops->validate) {
1065 err = ops->validate(tb, data);
1066 if (err < 0)
1067 return err;
1068 }
1069 }
1070
1071 if (dev) {
1072 int modified = 0;
1073
1074 if (nlh->nlmsg_flags & NLM_F_EXCL)
1075 return -EEXIST;
1076 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1077 return -EOPNOTSUPP;
1078
1079 if (linkinfo[IFLA_INFO_DATA]) {
1080 if (!ops || ops != dev->rtnl_link_ops ||
1081 !ops->changelink)
1082 return -EOPNOTSUPP;
1083
1084 err = ops->changelink(dev, tb, data);
1085 if (err < 0)
1086 return err;
1087 modified = 1;
1088 }
1089
1090 return do_setlink(dev, ifm, tb, ifname, modified);
1091 }
1092
1093 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
1094 return -ENODEV;
1095
1096 if (ifm->ifi_index || ifm->ifi_flags || ifm->ifi_change)
1097 return -EOPNOTSUPP;
1098 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO])
1099 return -EOPNOTSUPP;
1100
1101 if (!ops) {
1102 #ifdef CONFIG_KMOD
1103 if (kind[0]) {
1104 __rtnl_unlock();
1105 request_module("rtnl-link-%s", kind);
1106 rtnl_lock();
1107 ops = rtnl_link_ops_get(kind);
1108 if (ops)
1109 goto replay;
1110 }
1111 #endif
1112 return -EOPNOTSUPP;
1113 }
1114
1115 if (!ifname[0])
1116 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
1117
1118 dev = rtnl_create_link(net, ifname, ops, tb);
1119
1120 if (IS_ERR(dev))
1121 err = PTR_ERR(dev);
1122 else if (ops->newlink)
1123 err = ops->newlink(dev, tb, data);
1124 else
1125 err = register_netdevice(dev);
1126
1127 if (err < 0 && !IS_ERR(dev))
1128 free_netdev(dev);
1129 return err;
1130 }
1131 }
1132
1133 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
1134 {
1135 struct net *net = sock_net(skb->sk);
1136 struct ifinfomsg *ifm;
1137 struct nlattr *tb[IFLA_MAX+1];
1138 struct net_device *dev = NULL;
1139 struct sk_buff *nskb;
1140 int err;
1141
1142 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1143 if (err < 0)
1144 return err;
1145
1146 ifm = nlmsg_data(nlh);
1147 if (ifm->ifi_index > 0) {
1148 dev = dev_get_by_index(net, ifm->ifi_index);
1149 if (dev == NULL)
1150 return -ENODEV;
1151 } else
1152 return -EINVAL;
1153
1154 nskb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL);
1155 if (nskb == NULL) {
1156 err = -ENOBUFS;
1157 goto errout;
1158 }
1159
1160 err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).pid,
1161 nlh->nlmsg_seq, 0, 0);
1162 if (err < 0) {
1163 /* -EMSGSIZE implies BUG in if_nlmsg_size */
1164 WARN_ON(err == -EMSGSIZE);
1165 kfree_skb(nskb);
1166 goto errout;
1167 }
1168 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).pid);
1169 errout:
1170 dev_put(dev);
1171
1172 return err;
1173 }
1174
1175 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
1176 {
1177 int idx;
1178 int s_idx = cb->family;
1179
1180 if (s_idx == 0)
1181 s_idx = 1;
1182 for (idx=1; idx<NPROTO; idx++) {
1183 int type = cb->nlh->nlmsg_type-RTM_BASE;
1184 if (idx < s_idx || idx == PF_PACKET)
1185 continue;
1186 if (rtnl_msg_handlers[idx] == NULL ||
1187 rtnl_msg_handlers[idx][type].dumpit == NULL)
1188 continue;
1189 if (idx > s_idx)
1190 memset(&cb->args[0], 0, sizeof(cb->args));
1191 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb))
1192 break;
1193 }
1194 cb->family = idx;
1195
1196 return skb->len;
1197 }
1198
1199 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change)
1200 {
1201 struct net *net = dev_net(dev);
1202 struct sk_buff *skb;
1203 int err = -ENOBUFS;
1204
1205 skb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL);
1206 if (skb == NULL)
1207 goto errout;
1208
1209 err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0);
1210 if (err < 0) {
1211 /* -EMSGSIZE implies BUG in if_nlmsg_size() */
1212 WARN_ON(err == -EMSGSIZE);
1213 kfree_skb(skb);
1214 goto errout;
1215 }
1216 err = rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_KERNEL);
1217 errout:
1218 if (err < 0)
1219 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
1220 }
1221
1222 /* Protected by RTNL sempahore. */
1223 static struct rtattr **rta_buf;
1224 static int rtattr_max;
1225
1226 /* Process one rtnetlink message. */
1227
1228 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
1229 {
1230 struct net *net = sock_net(skb->sk);
1231 rtnl_doit_func doit;
1232 int sz_idx, kind;
1233 int min_len;
1234 int family;
1235 int type;
1236 int err;
1237
1238 type = nlh->nlmsg_type;
1239 if (type > RTM_MAX)
1240 return -EOPNOTSUPP;
1241
1242 type -= RTM_BASE;
1243
1244 /* All the messages must have at least 1 byte length */
1245 if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg)))
1246 return 0;
1247
1248 family = ((struct rtgenmsg*)NLMSG_DATA(nlh))->rtgen_family;
1249 if (family >= NPROTO)
1250 return -EAFNOSUPPORT;
1251
1252 sz_idx = type>>2;
1253 kind = type&3;
1254
1255 if (kind != 2 && security_netlink_recv(skb, CAP_NET_ADMIN))
1256 return -EPERM;
1257
1258 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
1259 struct sock *rtnl;
1260 rtnl_dumpit_func dumpit;
1261
1262 dumpit = rtnl_get_dumpit(family, type);
1263 if (dumpit == NULL)
1264 return -EOPNOTSUPP;
1265
1266 __rtnl_unlock();
1267 rtnl = net->rtnl;
1268 err = netlink_dump_start(rtnl, skb, nlh, dumpit, NULL);
1269 rtnl_lock();
1270 return err;
1271 }
1272
1273 memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *)));
1274
1275 min_len = rtm_min[sz_idx];
1276 if (nlh->nlmsg_len < min_len)
1277 return -EINVAL;
1278
1279 if (nlh->nlmsg_len > min_len) {
1280 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
1281 struct rtattr *attr = (void*)nlh + NLMSG_ALIGN(min_len);
1282
1283 while (RTA_OK(attr, attrlen)) {
1284 unsigned flavor = attr->rta_type;
1285 if (flavor) {
1286 if (flavor > rta_max[sz_idx])
1287 return -EINVAL;
1288 rta_buf[flavor-1] = attr;
1289 }
1290 attr = RTA_NEXT(attr, attrlen);
1291 }
1292 }
1293
1294 doit = rtnl_get_doit(family, type);
1295 if (doit == NULL)
1296 return -EOPNOTSUPP;
1297
1298 return doit(skb, nlh, (void *)&rta_buf[0]);
1299 }
1300
1301 static void rtnetlink_rcv(struct sk_buff *skb)
1302 {
1303 rtnl_lock();
1304 netlink_rcv_skb(skb, &rtnetlink_rcv_msg);
1305 rtnl_unlock();
1306 }
1307
1308 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
1309 {
1310 struct net_device *dev = ptr;
1311
1312 switch (event) {
1313 case NETDEV_UNREGISTER:
1314 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);
1315 break;
1316 case NETDEV_REGISTER:
1317 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
1318 break;
1319 case NETDEV_UP:
1320 case NETDEV_DOWN:
1321 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
1322 break;
1323 case NETDEV_CHANGE:
1324 case NETDEV_GOING_DOWN:
1325 break;
1326 default:
1327 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
1328 break;
1329 }
1330 return NOTIFY_DONE;
1331 }
1332
1333 static struct notifier_block rtnetlink_dev_notifier = {
1334 .notifier_call = rtnetlink_event,
1335 };
1336
1337
1338 static int rtnetlink_net_init(struct net *net)
1339 {
1340 struct sock *sk;
1341 sk = netlink_kernel_create(net, NETLINK_ROUTE, RTNLGRP_MAX,
1342 rtnetlink_rcv, &rtnl_mutex, THIS_MODULE);
1343 if (!sk)
1344 return -ENOMEM;
1345 net->rtnl = sk;
1346 return 0;
1347 }
1348
1349 static void rtnetlink_net_exit(struct net *net)
1350 {
1351 netlink_kernel_release(net->rtnl);
1352 net->rtnl = NULL;
1353 }
1354
1355 static struct pernet_operations rtnetlink_net_ops = {
1356 .init = rtnetlink_net_init,
1357 .exit = rtnetlink_net_exit,
1358 };
1359
1360 void __init rtnetlink_init(void)
1361 {
1362 int i;
1363
1364 rtattr_max = 0;
1365 for (i = 0; i < ARRAY_SIZE(rta_max); i++)
1366 if (rta_max[i] > rtattr_max)
1367 rtattr_max = rta_max[i];
1368 rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL);
1369 if (!rta_buf)
1370 panic("rtnetlink_init: cannot allocate rta_buf\n");
1371
1372 if (register_pernet_subsys(&rtnetlink_net_ops))
1373 panic("rtnetlink_init: cannot initialize rtnetlink\n");
1374
1375 netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV);
1376 register_netdevice_notifier(&rtnetlink_dev_notifier);
1377
1378 rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink, rtnl_dump_ifinfo);
1379 rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL);
1380 rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL);
1381 rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL);
1382
1383 rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all);
1384 rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all);
1385 }
1386
1387 EXPORT_SYMBOL(__rta_fill);
1388 EXPORT_SYMBOL(rtnetlink_put_metrics);
1389 EXPORT_SYMBOL(rtnl_lock);
1390 EXPORT_SYMBOL(rtnl_trylock);
1391 EXPORT_SYMBOL(rtnl_unlock);
1392 EXPORT_SYMBOL(rtnl_unicast);
1393 EXPORT_SYMBOL(rtnl_notify);
1394 EXPORT_SYMBOL(rtnl_set_sk_err);
1395 EXPORT_SYMBOL(rtnl_create_link);
1396 EXPORT_SYMBOL(ifla_policy);
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