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Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb-2.6
[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/pci.h>
39
40 #include <asm/uaccess.h>
41 #include <asm/system.h>
42
43 #include <linux/inet.h>
44 #include <linux/netdevice.h>
45 #include <net/ip.h>
46 #include <net/protocol.h>
47 #include <net/arp.h>
48 #include <net/route.h>
49 #include <net/udp.h>
50 #include <net/sock.h>
51 #include <net/pkt_sched.h>
52 #include <net/fib_rules.h>
53 #include <net/rtnetlink.h>
54 #include <net/net_namespace.h>
55
56 struct rtnl_link {
57 rtnl_doit_func doit;
58 rtnl_dumpit_func dumpit;
59 };
60
61 static DEFINE_MUTEX(rtnl_mutex);
62
63 void rtnl_lock(void)
64 {
65 mutex_lock(&rtnl_mutex);
66 }
67 EXPORT_SYMBOL(rtnl_lock);
68
69 void __rtnl_unlock(void)
70 {
71 mutex_unlock(&rtnl_mutex);
72 }
73
74 void rtnl_unlock(void)
75 {
76 /* This fellow will unlock it for us. */
77 netdev_run_todo();
78 }
79 EXPORT_SYMBOL(rtnl_unlock);
80
81 int rtnl_trylock(void)
82 {
83 return mutex_trylock(&rtnl_mutex);
84 }
85 EXPORT_SYMBOL(rtnl_trylock);
86
87 int rtnl_is_locked(void)
88 {
89 return mutex_is_locked(&rtnl_mutex);
90 }
91 EXPORT_SYMBOL(rtnl_is_locked);
92
93 #ifdef CONFIG_PROVE_LOCKING
94 int lockdep_rtnl_is_held(void)
95 {
96 return lockdep_is_held(&rtnl_mutex);
97 }
98 EXPORT_SYMBOL(lockdep_rtnl_is_held);
99 #endif /* #ifdef CONFIG_PROVE_LOCKING */
100
101 static struct rtnl_link *rtnl_msg_handlers[RTNL_FAMILY_MAX + 1];
102
103 static inline int rtm_msgindex(int msgtype)
104 {
105 int msgindex = msgtype - RTM_BASE;
106
107 /*
108 * msgindex < 0 implies someone tried to register a netlink
109 * control code. msgindex >= RTM_NR_MSGTYPES may indicate that
110 * the message type has not been added to linux/rtnetlink.h
111 */
112 BUG_ON(msgindex < 0 || msgindex >= RTM_NR_MSGTYPES);
113
114 return msgindex;
115 }
116
117 static rtnl_doit_func rtnl_get_doit(int protocol, int msgindex)
118 {
119 struct rtnl_link *tab;
120
121 if (protocol <= RTNL_FAMILY_MAX)
122 tab = rtnl_msg_handlers[protocol];
123 else
124 tab = NULL;
125
126 if (tab == NULL || tab[msgindex].doit == NULL)
127 tab = rtnl_msg_handlers[PF_UNSPEC];
128
129 return tab ? tab[msgindex].doit : NULL;
130 }
131
132 static rtnl_dumpit_func rtnl_get_dumpit(int protocol, int msgindex)
133 {
134 struct rtnl_link *tab;
135
136 if (protocol <= RTNL_FAMILY_MAX)
137 tab = rtnl_msg_handlers[protocol];
138 else
139 tab = NULL;
140
141 if (tab == NULL || tab[msgindex].dumpit == NULL)
142 tab = rtnl_msg_handlers[PF_UNSPEC];
143
144 return tab ? tab[msgindex].dumpit : NULL;
145 }
146
147 /**
148 * __rtnl_register - Register a rtnetlink message type
149 * @protocol: Protocol family or PF_UNSPEC
150 * @msgtype: rtnetlink message type
151 * @doit: Function pointer called for each request message
152 * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message
153 *
154 * Registers the specified function pointers (at least one of them has
155 * to be non-NULL) to be called whenever a request message for the
156 * specified protocol family and message type is received.
157 *
158 * The special protocol family PF_UNSPEC may be used to define fallback
159 * function pointers for the case when no entry for the specific protocol
160 * family exists.
161 *
162 * Returns 0 on success or a negative error code.
163 */
164 int __rtnl_register(int protocol, int msgtype,
165 rtnl_doit_func doit, rtnl_dumpit_func dumpit)
166 {
167 struct rtnl_link *tab;
168 int msgindex;
169
170 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
171 msgindex = rtm_msgindex(msgtype);
172
173 tab = rtnl_msg_handlers[protocol];
174 if (tab == NULL) {
175 tab = kcalloc(RTM_NR_MSGTYPES, sizeof(*tab), GFP_KERNEL);
176 if (tab == NULL)
177 return -ENOBUFS;
178
179 rtnl_msg_handlers[protocol] = tab;
180 }
181
182 if (doit)
183 tab[msgindex].doit = doit;
184
185 if (dumpit)
186 tab[msgindex].dumpit = dumpit;
187
188 return 0;
189 }
190 EXPORT_SYMBOL_GPL(__rtnl_register);
191
192 /**
193 * rtnl_register - Register a rtnetlink message type
194 *
195 * Identical to __rtnl_register() but panics on failure. This is useful
196 * as failure of this function is very unlikely, it can only happen due
197 * to lack of memory when allocating the chain to store all message
198 * handlers for a protocol. Meant for use in init functions where lack
199 * of memory implies no sense in continueing.
200 */
201 void rtnl_register(int protocol, int msgtype,
202 rtnl_doit_func doit, rtnl_dumpit_func dumpit)
203 {
204 if (__rtnl_register(protocol, msgtype, doit, dumpit) < 0)
205 panic("Unable to register rtnetlink message handler, "
206 "protocol = %d, message type = %d\n",
207 protocol, msgtype);
208 }
209 EXPORT_SYMBOL_GPL(rtnl_register);
210
211 /**
212 * rtnl_unregister - Unregister a rtnetlink message type
213 * @protocol: Protocol family or PF_UNSPEC
214 * @msgtype: rtnetlink message type
215 *
216 * Returns 0 on success or a negative error code.
217 */
218 int rtnl_unregister(int protocol, int msgtype)
219 {
220 int msgindex;
221
222 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
223 msgindex = rtm_msgindex(msgtype);
224
225 if (rtnl_msg_handlers[protocol] == NULL)
226 return -ENOENT;
227
228 rtnl_msg_handlers[protocol][msgindex].doit = NULL;
229 rtnl_msg_handlers[protocol][msgindex].dumpit = NULL;
230
231 return 0;
232 }
233 EXPORT_SYMBOL_GPL(rtnl_unregister);
234
235 /**
236 * rtnl_unregister_all - Unregister all rtnetlink message type of a protocol
237 * @protocol : Protocol family or PF_UNSPEC
238 *
239 * Identical to calling rtnl_unregster() for all registered message types
240 * of a certain protocol family.
241 */
242 void rtnl_unregister_all(int protocol)
243 {
244 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
245
246 kfree(rtnl_msg_handlers[protocol]);
247 rtnl_msg_handlers[protocol] = NULL;
248 }
249 EXPORT_SYMBOL_GPL(rtnl_unregister_all);
250
251 static LIST_HEAD(link_ops);
252
253 /**
254 * __rtnl_link_register - Register rtnl_link_ops with rtnetlink.
255 * @ops: struct rtnl_link_ops * to register
256 *
257 * The caller must hold the rtnl_mutex. This function should be used
258 * by drivers that create devices during module initialization. It
259 * must be called before registering the devices.
260 *
261 * Returns 0 on success or a negative error code.
262 */
263 int __rtnl_link_register(struct rtnl_link_ops *ops)
264 {
265 if (!ops->dellink)
266 ops->dellink = unregister_netdevice_queue;
267
268 list_add_tail(&ops->list, &link_ops);
269 return 0;
270 }
271 EXPORT_SYMBOL_GPL(__rtnl_link_register);
272
273 /**
274 * rtnl_link_register - Register rtnl_link_ops with rtnetlink.
275 * @ops: struct rtnl_link_ops * to register
276 *
277 * Returns 0 on success or a negative error code.
278 */
279 int rtnl_link_register(struct rtnl_link_ops *ops)
280 {
281 int err;
282
283 rtnl_lock();
284 err = __rtnl_link_register(ops);
285 rtnl_unlock();
286 return err;
287 }
288 EXPORT_SYMBOL_GPL(rtnl_link_register);
289
290 static void __rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops)
291 {
292 struct net_device *dev;
293 LIST_HEAD(list_kill);
294
295 for_each_netdev(net, dev) {
296 if (dev->rtnl_link_ops == ops)
297 ops->dellink(dev, &list_kill);
298 }
299 unregister_netdevice_many(&list_kill);
300 }
301
302 void rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops)
303 {
304 rtnl_lock();
305 __rtnl_kill_links(net, ops);
306 rtnl_unlock();
307 }
308 EXPORT_SYMBOL_GPL(rtnl_kill_links);
309
310 /**
311 * __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
312 * @ops: struct rtnl_link_ops * to unregister
313 *
314 * The caller must hold the rtnl_mutex.
315 */
316 void __rtnl_link_unregister(struct rtnl_link_ops *ops)
317 {
318 struct net *net;
319
320 for_each_net(net) {
321 __rtnl_kill_links(net, ops);
322 }
323 list_del(&ops->list);
324 }
325 EXPORT_SYMBOL_GPL(__rtnl_link_unregister);
326
327 /**
328 * rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
329 * @ops: struct rtnl_link_ops * to unregister
330 */
331 void rtnl_link_unregister(struct rtnl_link_ops *ops)
332 {
333 rtnl_lock();
334 __rtnl_link_unregister(ops);
335 rtnl_unlock();
336 }
337 EXPORT_SYMBOL_GPL(rtnl_link_unregister);
338
339 static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind)
340 {
341 const struct rtnl_link_ops *ops;
342
343 list_for_each_entry(ops, &link_ops, list) {
344 if (!strcmp(ops->kind, kind))
345 return ops;
346 }
347 return NULL;
348 }
349
350 static size_t rtnl_link_get_size(const struct net_device *dev)
351 {
352 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
353 size_t size;
354
355 if (!ops)
356 return 0;
357
358 size = nlmsg_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */
359 nlmsg_total_size(strlen(ops->kind) + 1); /* IFLA_INFO_KIND */
360
361 if (ops->get_size)
362 /* IFLA_INFO_DATA + nested data */
363 size += nlmsg_total_size(sizeof(struct nlattr)) +
364 ops->get_size(dev);
365
366 if (ops->get_xstats_size)
367 size += ops->get_xstats_size(dev); /* IFLA_INFO_XSTATS */
368
369 return size;
370 }
371
372 static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev)
373 {
374 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
375 struct nlattr *linkinfo, *data;
376 int err = -EMSGSIZE;
377
378 linkinfo = nla_nest_start(skb, IFLA_LINKINFO);
379 if (linkinfo == NULL)
380 goto out;
381
382 if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0)
383 goto err_cancel_link;
384 if (ops->fill_xstats) {
385 err = ops->fill_xstats(skb, dev);
386 if (err < 0)
387 goto err_cancel_link;
388 }
389 if (ops->fill_info) {
390 data = nla_nest_start(skb, IFLA_INFO_DATA);
391 if (data == NULL)
392 goto err_cancel_link;
393 err = ops->fill_info(skb, dev);
394 if (err < 0)
395 goto err_cancel_data;
396 nla_nest_end(skb, data);
397 }
398
399 nla_nest_end(skb, linkinfo);
400 return 0;
401
402 err_cancel_data:
403 nla_nest_cancel(skb, data);
404 err_cancel_link:
405 nla_nest_cancel(skb, linkinfo);
406 out:
407 return err;
408 }
409
410 static const int rtm_min[RTM_NR_FAMILIES] =
411 {
412 [RTM_FAM(RTM_NEWLINK)] = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
413 [RTM_FAM(RTM_NEWADDR)] = NLMSG_LENGTH(sizeof(struct ifaddrmsg)),
414 [RTM_FAM(RTM_NEWROUTE)] = NLMSG_LENGTH(sizeof(struct rtmsg)),
415 [RTM_FAM(RTM_NEWRULE)] = NLMSG_LENGTH(sizeof(struct fib_rule_hdr)),
416 [RTM_FAM(RTM_NEWQDISC)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
417 [RTM_FAM(RTM_NEWTCLASS)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
418 [RTM_FAM(RTM_NEWTFILTER)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
419 [RTM_FAM(RTM_NEWACTION)] = NLMSG_LENGTH(sizeof(struct tcamsg)),
420 [RTM_FAM(RTM_GETMULTICAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
421 [RTM_FAM(RTM_GETANYCAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
422 };
423
424 static const int rta_max[RTM_NR_FAMILIES] =
425 {
426 [RTM_FAM(RTM_NEWLINK)] = IFLA_MAX,
427 [RTM_FAM(RTM_NEWADDR)] = IFA_MAX,
428 [RTM_FAM(RTM_NEWROUTE)] = RTA_MAX,
429 [RTM_FAM(RTM_NEWRULE)] = FRA_MAX,
430 [RTM_FAM(RTM_NEWQDISC)] = TCA_MAX,
431 [RTM_FAM(RTM_NEWTCLASS)] = TCA_MAX,
432 [RTM_FAM(RTM_NEWTFILTER)] = TCA_MAX,
433 [RTM_FAM(RTM_NEWACTION)] = TCAA_MAX,
434 };
435
436 void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const void *data)
437 {
438 struct rtattr *rta;
439 int size = RTA_LENGTH(attrlen);
440
441 rta = (struct rtattr *)skb_put(skb, RTA_ALIGN(size));
442 rta->rta_type = attrtype;
443 rta->rta_len = size;
444 memcpy(RTA_DATA(rta), data, attrlen);
445 memset(RTA_DATA(rta) + attrlen, 0, RTA_ALIGN(size) - size);
446 }
447 EXPORT_SYMBOL(__rta_fill);
448
449 int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned group, int echo)
450 {
451 struct sock *rtnl = net->rtnl;
452 int err = 0;
453
454 NETLINK_CB(skb).dst_group = group;
455 if (echo)
456 atomic_inc(&skb->users);
457 netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL);
458 if (echo)
459 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
460 return err;
461 }
462
463 int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid)
464 {
465 struct sock *rtnl = net->rtnl;
466
467 return nlmsg_unicast(rtnl, skb, pid);
468 }
469 EXPORT_SYMBOL(rtnl_unicast);
470
471 void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group,
472 struct nlmsghdr *nlh, gfp_t flags)
473 {
474 struct sock *rtnl = net->rtnl;
475 int report = 0;
476
477 if (nlh)
478 report = nlmsg_report(nlh);
479
480 nlmsg_notify(rtnl, skb, pid, group, report, flags);
481 }
482 EXPORT_SYMBOL(rtnl_notify);
483
484 void rtnl_set_sk_err(struct net *net, u32 group, int error)
485 {
486 struct sock *rtnl = net->rtnl;
487
488 netlink_set_err(rtnl, 0, group, error);
489 }
490 EXPORT_SYMBOL(rtnl_set_sk_err);
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 nla_nest_cancel(skb, mx);
517 return -EMSGSIZE;
518 }
519 EXPORT_SYMBOL(rtnetlink_put_metrics);
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 EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo);
540
541 static void set_operstate(struct net_device *dev, unsigned char transition)
542 {
543 unsigned char operstate = dev->operstate;
544
545 switch (transition) {
546 case IF_OPER_UP:
547 if ((operstate == IF_OPER_DORMANT ||
548 operstate == IF_OPER_UNKNOWN) &&
549 !netif_dormant(dev))
550 operstate = IF_OPER_UP;
551 break;
552
553 case IF_OPER_DORMANT:
554 if (operstate == IF_OPER_UP ||
555 operstate == IF_OPER_UNKNOWN)
556 operstate = IF_OPER_DORMANT;
557 break;
558 }
559
560 if (dev->operstate != operstate) {
561 write_lock_bh(&dev_base_lock);
562 dev->operstate = operstate;
563 write_unlock_bh(&dev_base_lock);
564 netdev_state_change(dev);
565 }
566 }
567
568 static unsigned int rtnl_dev_combine_flags(const struct net_device *dev,
569 const struct ifinfomsg *ifm)
570 {
571 unsigned int flags = ifm->ifi_flags;
572
573 /* bugwards compatibility: ifi_change == 0 is treated as ~0 */
574 if (ifm->ifi_change)
575 flags = (flags & ifm->ifi_change) |
576 (dev->flags & ~ifm->ifi_change);
577
578 return flags;
579 }
580
581 static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
582 const struct rtnl_link_stats64 *b)
583 {
584 a->rx_packets = b->rx_packets;
585 a->tx_packets = b->tx_packets;
586 a->rx_bytes = b->rx_bytes;
587 a->tx_bytes = b->tx_bytes;
588 a->rx_errors = b->rx_errors;
589 a->tx_errors = b->tx_errors;
590 a->rx_dropped = b->rx_dropped;
591 a->tx_dropped = b->tx_dropped;
592
593 a->multicast = b->multicast;
594 a->collisions = b->collisions;
595
596 a->rx_length_errors = b->rx_length_errors;
597 a->rx_over_errors = b->rx_over_errors;
598 a->rx_crc_errors = b->rx_crc_errors;
599 a->rx_frame_errors = b->rx_frame_errors;
600 a->rx_fifo_errors = b->rx_fifo_errors;
601 a->rx_missed_errors = b->rx_missed_errors;
602
603 a->tx_aborted_errors = b->tx_aborted_errors;
604 a->tx_carrier_errors = b->tx_carrier_errors;
605 a->tx_fifo_errors = b->tx_fifo_errors;
606 a->tx_heartbeat_errors = b->tx_heartbeat_errors;
607 a->tx_window_errors = b->tx_window_errors;
608
609 a->rx_compressed = b->rx_compressed;
610 a->tx_compressed = b->tx_compressed;
611 }
612
613 static void copy_rtnl_link_stats64(void *v, const struct rtnl_link_stats64 *b)
614 {
615 struct rtnl_link_stats64 a;
616
617 a.rx_packets = b->rx_packets;
618 a.tx_packets = b->tx_packets;
619 a.rx_bytes = b->rx_bytes;
620 a.tx_bytes = b->tx_bytes;
621 a.rx_errors = b->rx_errors;
622 a.tx_errors = b->tx_errors;
623 a.rx_dropped = b->rx_dropped;
624 a.tx_dropped = b->tx_dropped;
625
626 a.multicast = b->multicast;
627 a.collisions = b->collisions;
628
629 a.rx_length_errors = b->rx_length_errors;
630 a.rx_over_errors = b->rx_over_errors;
631 a.rx_crc_errors = b->rx_crc_errors;
632 a.rx_frame_errors = b->rx_frame_errors;
633 a.rx_fifo_errors = b->rx_fifo_errors;
634 a.rx_missed_errors = b->rx_missed_errors;
635
636 a.tx_aborted_errors = b->tx_aborted_errors;
637 a.tx_carrier_errors = b->tx_carrier_errors;
638 a.tx_fifo_errors = b->tx_fifo_errors;
639 a.tx_heartbeat_errors = b->tx_heartbeat_errors;
640 a.tx_window_errors = b->tx_window_errors;
641
642 a.rx_compressed = b->rx_compressed;
643 a.tx_compressed = b->tx_compressed;
644 memcpy(v, &a, sizeof(a));
645 }
646
647 /* All VF info */
648 static inline int rtnl_vfinfo_size(const struct net_device *dev)
649 {
650 if (dev->dev.parent && dev_is_pci(dev->dev.parent)) {
651
652 int num_vfs = dev_num_vf(dev->dev.parent);
653 size_t size = nla_total_size(sizeof(struct nlattr));
654 size += nla_total_size(num_vfs * sizeof(struct nlattr));
655 size += num_vfs *
656 (nla_total_size(sizeof(struct ifla_vf_mac)) +
657 nla_total_size(sizeof(struct ifla_vf_vlan)) +
658 nla_total_size(sizeof(struct ifla_vf_tx_rate)));
659 return size;
660 } else
661 return 0;
662 }
663
664 static size_t rtnl_port_size(const struct net_device *dev)
665 {
666 size_t port_size = nla_total_size(4) /* PORT_VF */
667 + nla_total_size(PORT_PROFILE_MAX) /* PORT_PROFILE */
668 + nla_total_size(sizeof(struct ifla_port_vsi))
669 /* PORT_VSI_TYPE */
670 + nla_total_size(PORT_UUID_MAX) /* PORT_INSTANCE_UUID */
671 + nla_total_size(PORT_UUID_MAX) /* PORT_HOST_UUID */
672 + nla_total_size(1) /* PROT_VDP_REQUEST */
673 + nla_total_size(2); /* PORT_VDP_RESPONSE */
674 size_t vf_ports_size = nla_total_size(sizeof(struct nlattr));
675 size_t vf_port_size = nla_total_size(sizeof(struct nlattr))
676 + port_size;
677 size_t port_self_size = nla_total_size(sizeof(struct nlattr))
678 + port_size;
679
680 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent)
681 return 0;
682 if (dev_num_vf(dev->dev.parent))
683 return port_self_size + vf_ports_size +
684 vf_port_size * dev_num_vf(dev->dev.parent);
685 else
686 return port_self_size;
687 }
688
689 static noinline size_t if_nlmsg_size(const struct net_device *dev)
690 {
691 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
692 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
693 + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */
694 + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */
695 + nla_total_size(sizeof(struct rtnl_link_ifmap))
696 + nla_total_size(sizeof(struct rtnl_link_stats))
697 + nla_total_size(sizeof(struct rtnl_link_stats64))
698 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
699 + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */
700 + nla_total_size(4) /* IFLA_TXQLEN */
701 + nla_total_size(4) /* IFLA_WEIGHT */
702 + nla_total_size(4) /* IFLA_MTU */
703 + nla_total_size(4) /* IFLA_LINK */
704 + nla_total_size(4) /* IFLA_MASTER */
705 + nla_total_size(1) /* IFLA_OPERSTATE */
706 + nla_total_size(1) /* IFLA_LINKMODE */
707 + nla_total_size(4) /* IFLA_NUM_VF */
708 + rtnl_vfinfo_size(dev) /* IFLA_VFINFO_LIST */
709 + rtnl_port_size(dev) /* IFLA_VF_PORTS + IFLA_PORT_SELF */
710 + rtnl_link_get_size(dev); /* IFLA_LINKINFO */
711 }
712
713 static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev)
714 {
715 struct nlattr *vf_ports;
716 struct nlattr *vf_port;
717 int vf;
718 int err;
719
720 vf_ports = nla_nest_start(skb, IFLA_VF_PORTS);
721 if (!vf_ports)
722 return -EMSGSIZE;
723
724 for (vf = 0; vf < dev_num_vf(dev->dev.parent); vf++) {
725 vf_port = nla_nest_start(skb, IFLA_VF_PORT);
726 if (!vf_port)
727 goto nla_put_failure;
728 NLA_PUT_U32(skb, IFLA_PORT_VF, vf);
729 err = dev->netdev_ops->ndo_get_vf_port(dev, vf, skb);
730 if (err == -EMSGSIZE)
731 goto nla_put_failure;
732 if (err) {
733 nla_nest_cancel(skb, vf_port);
734 continue;
735 }
736 nla_nest_end(skb, vf_port);
737 }
738
739 nla_nest_end(skb, vf_ports);
740
741 return 0;
742
743 nla_put_failure:
744 nla_nest_cancel(skb, vf_ports);
745 return -EMSGSIZE;
746 }
747
748 static int rtnl_port_self_fill(struct sk_buff *skb, struct net_device *dev)
749 {
750 struct nlattr *port_self;
751 int err;
752
753 port_self = nla_nest_start(skb, IFLA_PORT_SELF);
754 if (!port_self)
755 return -EMSGSIZE;
756
757 err = dev->netdev_ops->ndo_get_vf_port(dev, PORT_SELF_VF, skb);
758 if (err) {
759 nla_nest_cancel(skb, port_self);
760 return (err == -EMSGSIZE) ? err : 0;
761 }
762
763 nla_nest_end(skb, port_self);
764
765 return 0;
766 }
767
768 static int rtnl_port_fill(struct sk_buff *skb, struct net_device *dev)
769 {
770 int err;
771
772 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent)
773 return 0;
774
775 err = rtnl_port_self_fill(skb, dev);
776 if (err)
777 return err;
778
779 if (dev_num_vf(dev->dev.parent)) {
780 err = rtnl_vf_ports_fill(skb, dev);
781 if (err)
782 return err;
783 }
784
785 return 0;
786 }
787
788 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
789 int type, u32 pid, u32 seq, u32 change,
790 unsigned int flags)
791 {
792 struct ifinfomsg *ifm;
793 struct nlmsghdr *nlh;
794 struct rtnl_link_stats64 temp;
795 const struct rtnl_link_stats64 *stats;
796 struct nlattr *attr;
797
798 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
799 if (nlh == NULL)
800 return -EMSGSIZE;
801
802 ifm = nlmsg_data(nlh);
803 ifm->ifi_family = AF_UNSPEC;
804 ifm->__ifi_pad = 0;
805 ifm->ifi_type = dev->type;
806 ifm->ifi_index = dev->ifindex;
807 ifm->ifi_flags = dev_get_flags(dev);
808 ifm->ifi_change = change;
809
810 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
811 NLA_PUT_U32(skb, IFLA_TXQLEN, dev->tx_queue_len);
812 NLA_PUT_U8(skb, IFLA_OPERSTATE,
813 netif_running(dev) ? dev->operstate : IF_OPER_DOWN);
814 NLA_PUT_U8(skb, IFLA_LINKMODE, dev->link_mode);
815 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
816
817 if (dev->ifindex != dev->iflink)
818 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
819
820 if (dev->master)
821 NLA_PUT_U32(skb, IFLA_MASTER, dev->master->ifindex);
822
823 if (dev->qdisc)
824 NLA_PUT_STRING(skb, IFLA_QDISC, dev->qdisc->ops->id);
825
826 if (dev->ifalias)
827 NLA_PUT_STRING(skb, IFLA_IFALIAS, dev->ifalias);
828
829 if (1) {
830 struct rtnl_link_ifmap map = {
831 .mem_start = dev->mem_start,
832 .mem_end = dev->mem_end,
833 .base_addr = dev->base_addr,
834 .irq = dev->irq,
835 .dma = dev->dma,
836 .port = dev->if_port,
837 };
838 NLA_PUT(skb, IFLA_MAP, sizeof(map), &map);
839 }
840
841 if (dev->addr_len) {
842 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
843 NLA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast);
844 }
845
846 attr = nla_reserve(skb, IFLA_STATS,
847 sizeof(struct rtnl_link_stats));
848 if (attr == NULL)
849 goto nla_put_failure;
850
851 stats = dev_get_stats(dev, &temp);
852 copy_rtnl_link_stats(nla_data(attr), stats);
853
854 attr = nla_reserve(skb, IFLA_STATS64,
855 sizeof(struct rtnl_link_stats64));
856 if (attr == NULL)
857 goto nla_put_failure;
858 copy_rtnl_link_stats64(nla_data(attr), stats);
859
860 if (dev->dev.parent)
861 NLA_PUT_U32(skb, IFLA_NUM_VF, dev_num_vf(dev->dev.parent));
862
863 if (dev->netdev_ops->ndo_get_vf_config && dev->dev.parent) {
864 int i;
865
866 struct nlattr *vfinfo, *vf;
867 int num_vfs = dev_num_vf(dev->dev.parent);
868
869 vfinfo = nla_nest_start(skb, IFLA_VFINFO_LIST);
870 if (!vfinfo)
871 goto nla_put_failure;
872 for (i = 0; i < num_vfs; i++) {
873 struct ifla_vf_info ivi;
874 struct ifla_vf_mac vf_mac;
875 struct ifla_vf_vlan vf_vlan;
876 struct ifla_vf_tx_rate vf_tx_rate;
877 if (dev->netdev_ops->ndo_get_vf_config(dev, i, &ivi))
878 break;
879 vf_mac.vf = vf_vlan.vf = vf_tx_rate.vf = ivi.vf;
880 memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac));
881 vf_vlan.vlan = ivi.vlan;
882 vf_vlan.qos = ivi.qos;
883 vf_tx_rate.rate = ivi.tx_rate;
884 vf = nla_nest_start(skb, IFLA_VF_INFO);
885 if (!vf) {
886 nla_nest_cancel(skb, vfinfo);
887 goto nla_put_failure;
888 }
889 NLA_PUT(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac);
890 NLA_PUT(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan);
891 NLA_PUT(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate), &vf_tx_rate);
892 nla_nest_end(skb, vf);
893 }
894 nla_nest_end(skb, vfinfo);
895 }
896
897 if (rtnl_port_fill(skb, dev))
898 goto nla_put_failure;
899
900 if (dev->rtnl_link_ops) {
901 if (rtnl_link_fill(skb, dev) < 0)
902 goto nla_put_failure;
903 }
904
905 return nlmsg_end(skb, nlh);
906
907 nla_put_failure:
908 nlmsg_cancel(skb, nlh);
909 return -EMSGSIZE;
910 }
911
912 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
913 {
914 struct net *net = sock_net(skb->sk);
915 int h, s_h;
916 int idx = 0, s_idx;
917 struct net_device *dev;
918 struct hlist_head *head;
919 struct hlist_node *node;
920
921 s_h = cb->args[0];
922 s_idx = cb->args[1];
923
924 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
925 idx = 0;
926 head = &net->dev_index_head[h];
927 hlist_for_each_entry(dev, node, head, index_hlist) {
928 if (idx < s_idx)
929 goto cont;
930 if (rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK,
931 NETLINK_CB(cb->skb).pid,
932 cb->nlh->nlmsg_seq, 0,
933 NLM_F_MULTI) <= 0)
934 goto out;
935 cont:
936 idx++;
937 }
938 }
939 out:
940 cb->args[1] = idx;
941 cb->args[0] = h;
942
943 return skb->len;
944 }
945
946 const struct nla_policy ifla_policy[IFLA_MAX+1] = {
947 [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 },
948 [IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
949 [IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
950 [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) },
951 [IFLA_MTU] = { .type = NLA_U32 },
952 [IFLA_LINK] = { .type = NLA_U32 },
953 [IFLA_TXQLEN] = { .type = NLA_U32 },
954 [IFLA_WEIGHT] = { .type = NLA_U32 },
955 [IFLA_OPERSTATE] = { .type = NLA_U8 },
956 [IFLA_LINKMODE] = { .type = NLA_U8 },
957 [IFLA_LINKINFO] = { .type = NLA_NESTED },
958 [IFLA_NET_NS_PID] = { .type = NLA_U32 },
959 [IFLA_IFALIAS] = { .type = NLA_STRING, .len = IFALIASZ-1 },
960 [IFLA_VFINFO_LIST] = {. type = NLA_NESTED },
961 [IFLA_VF_PORTS] = { .type = NLA_NESTED },
962 [IFLA_PORT_SELF] = { .type = NLA_NESTED },
963 };
964 EXPORT_SYMBOL(ifla_policy);
965
966 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
967 [IFLA_INFO_KIND] = { .type = NLA_STRING },
968 [IFLA_INFO_DATA] = { .type = NLA_NESTED },
969 };
970
971 static const struct nla_policy ifla_vfinfo_policy[IFLA_VF_INFO_MAX+1] = {
972 [IFLA_VF_INFO] = { .type = NLA_NESTED },
973 };
974
975 static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = {
976 [IFLA_VF_MAC] = { .type = NLA_BINARY,
977 .len = sizeof(struct ifla_vf_mac) },
978 [IFLA_VF_VLAN] = { .type = NLA_BINARY,
979 .len = sizeof(struct ifla_vf_vlan) },
980 [IFLA_VF_TX_RATE] = { .type = NLA_BINARY,
981 .len = sizeof(struct ifla_vf_tx_rate) },
982 };
983
984 static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = {
985 [IFLA_PORT_VF] = { .type = NLA_U32 },
986 [IFLA_PORT_PROFILE] = { .type = NLA_STRING,
987 .len = PORT_PROFILE_MAX },
988 [IFLA_PORT_VSI_TYPE] = { .type = NLA_BINARY,
989 .len = sizeof(struct ifla_port_vsi)},
990 [IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY,
991 .len = PORT_UUID_MAX },
992 [IFLA_PORT_HOST_UUID] = { .type = NLA_STRING,
993 .len = PORT_UUID_MAX },
994 [IFLA_PORT_REQUEST] = { .type = NLA_U8, },
995 [IFLA_PORT_RESPONSE] = { .type = NLA_U16, },
996 };
997
998 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[])
999 {
1000 struct net *net;
1001 /* Examine the link attributes and figure out which
1002 * network namespace we are talking about.
1003 */
1004 if (tb[IFLA_NET_NS_PID])
1005 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID]));
1006 else
1007 net = get_net(src_net);
1008 return net;
1009 }
1010 EXPORT_SYMBOL(rtnl_link_get_net);
1011
1012 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[])
1013 {
1014 if (dev) {
1015 if (tb[IFLA_ADDRESS] &&
1016 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
1017 return -EINVAL;
1018
1019 if (tb[IFLA_BROADCAST] &&
1020 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
1021 return -EINVAL;
1022 }
1023
1024 return 0;
1025 }
1026
1027 static int do_setvfinfo(struct net_device *dev, struct nlattr *attr)
1028 {
1029 int rem, err = -EINVAL;
1030 struct nlattr *vf;
1031 const struct net_device_ops *ops = dev->netdev_ops;
1032
1033 nla_for_each_nested(vf, attr, rem) {
1034 switch (nla_type(vf)) {
1035 case IFLA_VF_MAC: {
1036 struct ifla_vf_mac *ivm;
1037 ivm = nla_data(vf);
1038 err = -EOPNOTSUPP;
1039 if (ops->ndo_set_vf_mac)
1040 err = ops->ndo_set_vf_mac(dev, ivm->vf,
1041 ivm->mac);
1042 break;
1043 }
1044 case IFLA_VF_VLAN: {
1045 struct ifla_vf_vlan *ivv;
1046 ivv = nla_data(vf);
1047 err = -EOPNOTSUPP;
1048 if (ops->ndo_set_vf_vlan)
1049 err = ops->ndo_set_vf_vlan(dev, ivv->vf,
1050 ivv->vlan,
1051 ivv->qos);
1052 break;
1053 }
1054 case IFLA_VF_TX_RATE: {
1055 struct ifla_vf_tx_rate *ivt;
1056 ivt = nla_data(vf);
1057 err = -EOPNOTSUPP;
1058 if (ops->ndo_set_vf_tx_rate)
1059 err = ops->ndo_set_vf_tx_rate(dev, ivt->vf,
1060 ivt->rate);
1061 break;
1062 }
1063 default:
1064 err = -EINVAL;
1065 break;
1066 }
1067 if (err)
1068 break;
1069 }
1070 return err;
1071 }
1072
1073 static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm,
1074 struct nlattr **tb, char *ifname, int modified)
1075 {
1076 const struct net_device_ops *ops = dev->netdev_ops;
1077 int send_addr_notify = 0;
1078 int err;
1079
1080 if (tb[IFLA_NET_NS_PID]) {
1081 struct net *net = rtnl_link_get_net(dev_net(dev), tb);
1082 if (IS_ERR(net)) {
1083 err = PTR_ERR(net);
1084 goto errout;
1085 }
1086 err = dev_change_net_namespace(dev, net, ifname);
1087 put_net(net);
1088 if (err)
1089 goto errout;
1090 modified = 1;
1091 }
1092
1093 if (tb[IFLA_MAP]) {
1094 struct rtnl_link_ifmap *u_map;
1095 struct ifmap k_map;
1096
1097 if (!ops->ndo_set_config) {
1098 err = -EOPNOTSUPP;
1099 goto errout;
1100 }
1101
1102 if (!netif_device_present(dev)) {
1103 err = -ENODEV;
1104 goto errout;
1105 }
1106
1107 u_map = nla_data(tb[IFLA_MAP]);
1108 k_map.mem_start = (unsigned long) u_map->mem_start;
1109 k_map.mem_end = (unsigned long) u_map->mem_end;
1110 k_map.base_addr = (unsigned short) u_map->base_addr;
1111 k_map.irq = (unsigned char) u_map->irq;
1112 k_map.dma = (unsigned char) u_map->dma;
1113 k_map.port = (unsigned char) u_map->port;
1114
1115 err = ops->ndo_set_config(dev, &k_map);
1116 if (err < 0)
1117 goto errout;
1118
1119 modified = 1;
1120 }
1121
1122 if (tb[IFLA_ADDRESS]) {
1123 struct sockaddr *sa;
1124 int len;
1125
1126 if (!ops->ndo_set_mac_address) {
1127 err = -EOPNOTSUPP;
1128 goto errout;
1129 }
1130
1131 if (!netif_device_present(dev)) {
1132 err = -ENODEV;
1133 goto errout;
1134 }
1135
1136 len = sizeof(sa_family_t) + dev->addr_len;
1137 sa = kmalloc(len, GFP_KERNEL);
1138 if (!sa) {
1139 err = -ENOMEM;
1140 goto errout;
1141 }
1142 sa->sa_family = dev->type;
1143 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
1144 dev->addr_len);
1145 err = ops->ndo_set_mac_address(dev, sa);
1146 kfree(sa);
1147 if (err)
1148 goto errout;
1149 send_addr_notify = 1;
1150 modified = 1;
1151 }
1152
1153 if (tb[IFLA_MTU]) {
1154 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1155 if (err < 0)
1156 goto errout;
1157 modified = 1;
1158 }
1159
1160 /*
1161 * Interface selected by interface index but interface
1162 * name provided implies that a name change has been
1163 * requested.
1164 */
1165 if (ifm->ifi_index > 0 && ifname[0]) {
1166 err = dev_change_name(dev, ifname);
1167 if (err < 0)
1168 goto errout;
1169 modified = 1;
1170 }
1171
1172 if (tb[IFLA_IFALIAS]) {
1173 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]),
1174 nla_len(tb[IFLA_IFALIAS]));
1175 if (err < 0)
1176 goto errout;
1177 modified = 1;
1178 }
1179
1180 if (tb[IFLA_BROADCAST]) {
1181 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
1182 send_addr_notify = 1;
1183 }
1184
1185 if (ifm->ifi_flags || ifm->ifi_change) {
1186 err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
1187 if (err < 0)
1188 goto errout;
1189 }
1190
1191 if (tb[IFLA_TXQLEN])
1192 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
1193
1194 if (tb[IFLA_OPERSTATE])
1195 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
1196
1197 if (tb[IFLA_LINKMODE]) {
1198 write_lock_bh(&dev_base_lock);
1199 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
1200 write_unlock_bh(&dev_base_lock);
1201 }
1202
1203 if (tb[IFLA_VFINFO_LIST]) {
1204 struct nlattr *attr;
1205 int rem;
1206 nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) {
1207 if (nla_type(attr) != IFLA_VF_INFO) {
1208 err = -EINVAL;
1209 goto errout;
1210 }
1211 err = do_setvfinfo(dev, attr);
1212 if (err < 0)
1213 goto errout;
1214 modified = 1;
1215 }
1216 }
1217 err = 0;
1218
1219 if (tb[IFLA_VF_PORTS]) {
1220 struct nlattr *port[IFLA_PORT_MAX+1];
1221 struct nlattr *attr;
1222 int vf;
1223 int rem;
1224
1225 err = -EOPNOTSUPP;
1226 if (!ops->ndo_set_vf_port)
1227 goto errout;
1228
1229 nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) {
1230 if (nla_type(attr) != IFLA_VF_PORT)
1231 continue;
1232 err = nla_parse_nested(port, IFLA_PORT_MAX,
1233 attr, ifla_port_policy);
1234 if (err < 0)
1235 goto errout;
1236 if (!port[IFLA_PORT_VF]) {
1237 err = -EOPNOTSUPP;
1238 goto errout;
1239 }
1240 vf = nla_get_u32(port[IFLA_PORT_VF]);
1241 err = ops->ndo_set_vf_port(dev, vf, port);
1242 if (err < 0)
1243 goto errout;
1244 modified = 1;
1245 }
1246 }
1247 err = 0;
1248
1249 if (tb[IFLA_PORT_SELF]) {
1250 struct nlattr *port[IFLA_PORT_MAX+1];
1251
1252 err = nla_parse_nested(port, IFLA_PORT_MAX,
1253 tb[IFLA_PORT_SELF], ifla_port_policy);
1254 if (err < 0)
1255 goto errout;
1256
1257 err = -EOPNOTSUPP;
1258 if (ops->ndo_set_vf_port)
1259 err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port);
1260 if (err < 0)
1261 goto errout;
1262 modified = 1;
1263 }
1264 err = 0;
1265
1266 errout:
1267 if (err < 0 && modified && net_ratelimit())
1268 printk(KERN_WARNING "A link change request failed with "
1269 "some changes comitted already. Interface %s may "
1270 "have been left with an inconsistent configuration, "
1271 "please check.\n", dev->name);
1272
1273 if (send_addr_notify)
1274 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
1275 return err;
1276 }
1277
1278 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
1279 {
1280 struct net *net = sock_net(skb->sk);
1281 struct ifinfomsg *ifm;
1282 struct net_device *dev;
1283 int err;
1284 struct nlattr *tb[IFLA_MAX+1];
1285 char ifname[IFNAMSIZ];
1286
1287 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1288 if (err < 0)
1289 goto errout;
1290
1291 if (tb[IFLA_IFNAME])
1292 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1293 else
1294 ifname[0] = '\0';
1295
1296 err = -EINVAL;
1297 ifm = nlmsg_data(nlh);
1298 if (ifm->ifi_index > 0)
1299 dev = __dev_get_by_index(net, ifm->ifi_index);
1300 else if (tb[IFLA_IFNAME])
1301 dev = __dev_get_by_name(net, ifname);
1302 else
1303 goto errout;
1304
1305 if (dev == NULL) {
1306 err = -ENODEV;
1307 goto errout;
1308 }
1309
1310 err = validate_linkmsg(dev, tb);
1311 if (err < 0)
1312 goto errout;
1313
1314 err = do_setlink(dev, ifm, tb, ifname, 0);
1315 errout:
1316 return err;
1317 }
1318
1319 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
1320 {
1321 struct net *net = sock_net(skb->sk);
1322 const struct rtnl_link_ops *ops;
1323 struct net_device *dev;
1324 struct ifinfomsg *ifm;
1325 char ifname[IFNAMSIZ];
1326 struct nlattr *tb[IFLA_MAX+1];
1327 int err;
1328
1329 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1330 if (err < 0)
1331 return err;
1332
1333 if (tb[IFLA_IFNAME])
1334 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1335
1336 ifm = nlmsg_data(nlh);
1337 if (ifm->ifi_index > 0)
1338 dev = __dev_get_by_index(net, ifm->ifi_index);
1339 else if (tb[IFLA_IFNAME])
1340 dev = __dev_get_by_name(net, ifname);
1341 else
1342 return -EINVAL;
1343
1344 if (!dev)
1345 return -ENODEV;
1346
1347 ops = dev->rtnl_link_ops;
1348 if (!ops)
1349 return -EOPNOTSUPP;
1350
1351 ops->dellink(dev, NULL);
1352 return 0;
1353 }
1354
1355 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm)
1356 {
1357 unsigned int old_flags;
1358 int err;
1359
1360 old_flags = dev->flags;
1361 if (ifm && (ifm->ifi_flags || ifm->ifi_change)) {
1362 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
1363 if (err < 0)
1364 return err;
1365 }
1366
1367 dev->rtnl_link_state = RTNL_LINK_INITIALIZED;
1368 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
1369
1370 __dev_notify_flags(dev, old_flags);
1371 return 0;
1372 }
1373 EXPORT_SYMBOL(rtnl_configure_link);
1374
1375 struct net_device *rtnl_create_link(struct net *src_net, struct net *net,
1376 char *ifname, const struct rtnl_link_ops *ops, struct nlattr *tb[])
1377 {
1378 int err;
1379 struct net_device *dev;
1380 unsigned int num_queues = 1;
1381 unsigned int real_num_queues = 1;
1382
1383 if (ops->get_tx_queues) {
1384 err = ops->get_tx_queues(src_net, tb, &num_queues,
1385 &real_num_queues);
1386 if (err)
1387 goto err;
1388 }
1389 err = -ENOMEM;
1390 dev = alloc_netdev_mq(ops->priv_size, ifname, ops->setup, num_queues);
1391 if (!dev)
1392 goto err;
1393
1394 dev_net_set(dev, net);
1395 dev->rtnl_link_ops = ops;
1396 dev->rtnl_link_state = RTNL_LINK_INITIALIZING;
1397 dev->real_num_tx_queues = real_num_queues;
1398
1399 if (strchr(dev->name, '%')) {
1400 err = dev_alloc_name(dev, dev->name);
1401 if (err < 0)
1402 goto err_free;
1403 }
1404
1405 if (tb[IFLA_MTU])
1406 dev->mtu = nla_get_u32(tb[IFLA_MTU]);
1407 if (tb[IFLA_ADDRESS])
1408 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]),
1409 nla_len(tb[IFLA_ADDRESS]));
1410 if (tb[IFLA_BROADCAST])
1411 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]),
1412 nla_len(tb[IFLA_BROADCAST]));
1413 if (tb[IFLA_TXQLEN])
1414 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
1415 if (tb[IFLA_OPERSTATE])
1416 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
1417 if (tb[IFLA_LINKMODE])
1418 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
1419
1420 return dev;
1421
1422 err_free:
1423 free_netdev(dev);
1424 err:
1425 return ERR_PTR(err);
1426 }
1427 EXPORT_SYMBOL(rtnl_create_link);
1428
1429 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
1430 {
1431 struct net *net = sock_net(skb->sk);
1432 const struct rtnl_link_ops *ops;
1433 struct net_device *dev;
1434 struct ifinfomsg *ifm;
1435 char kind[MODULE_NAME_LEN];
1436 char ifname[IFNAMSIZ];
1437 struct nlattr *tb[IFLA_MAX+1];
1438 struct nlattr *linkinfo[IFLA_INFO_MAX+1];
1439 int err;
1440
1441 #ifdef CONFIG_MODULES
1442 replay:
1443 #endif
1444 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1445 if (err < 0)
1446 return err;
1447
1448 if (tb[IFLA_IFNAME])
1449 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1450 else
1451 ifname[0] = '\0';
1452
1453 ifm = nlmsg_data(nlh);
1454 if (ifm->ifi_index > 0)
1455 dev = __dev_get_by_index(net, ifm->ifi_index);
1456 else if (ifname[0])
1457 dev = __dev_get_by_name(net, ifname);
1458 else
1459 dev = NULL;
1460
1461 err = validate_linkmsg(dev, tb);
1462 if (err < 0)
1463 return err;
1464
1465 if (tb[IFLA_LINKINFO]) {
1466 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX,
1467 tb[IFLA_LINKINFO], ifla_info_policy);
1468 if (err < 0)
1469 return err;
1470 } else
1471 memset(linkinfo, 0, sizeof(linkinfo));
1472
1473 if (linkinfo[IFLA_INFO_KIND]) {
1474 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind));
1475 ops = rtnl_link_ops_get(kind);
1476 } else {
1477 kind[0] = '\0';
1478 ops = NULL;
1479 }
1480
1481 if (1) {
1482 struct nlattr *attr[ops ? ops->maxtype + 1 : 0], **data = NULL;
1483 struct net *dest_net;
1484
1485 if (ops) {
1486 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
1487 err = nla_parse_nested(attr, ops->maxtype,
1488 linkinfo[IFLA_INFO_DATA],
1489 ops->policy);
1490 if (err < 0)
1491 return err;
1492 data = attr;
1493 }
1494 if (ops->validate) {
1495 err = ops->validate(tb, data);
1496 if (err < 0)
1497 return err;
1498 }
1499 }
1500
1501 if (dev) {
1502 int modified = 0;
1503
1504 if (nlh->nlmsg_flags & NLM_F_EXCL)
1505 return -EEXIST;
1506 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1507 return -EOPNOTSUPP;
1508
1509 if (linkinfo[IFLA_INFO_DATA]) {
1510 if (!ops || ops != dev->rtnl_link_ops ||
1511 !ops->changelink)
1512 return -EOPNOTSUPP;
1513
1514 err = ops->changelink(dev, tb, data);
1515 if (err < 0)
1516 return err;
1517 modified = 1;
1518 }
1519
1520 return do_setlink(dev, ifm, tb, ifname, modified);
1521 }
1522
1523 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
1524 return -ENODEV;
1525
1526 if (ifm->ifi_index)
1527 return -EOPNOTSUPP;
1528 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO])
1529 return -EOPNOTSUPP;
1530
1531 if (!ops) {
1532 #ifdef CONFIG_MODULES
1533 if (kind[0]) {
1534 __rtnl_unlock();
1535 request_module("rtnl-link-%s", kind);
1536 rtnl_lock();
1537 ops = rtnl_link_ops_get(kind);
1538 if (ops)
1539 goto replay;
1540 }
1541 #endif
1542 return -EOPNOTSUPP;
1543 }
1544
1545 if (!ifname[0])
1546 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
1547
1548 dest_net = rtnl_link_get_net(net, tb);
1549 dev = rtnl_create_link(net, dest_net, ifname, ops, tb);
1550
1551 if (IS_ERR(dev))
1552 err = PTR_ERR(dev);
1553 else if (ops->newlink)
1554 err = ops->newlink(net, dev, tb, data);
1555 else
1556 err = register_netdevice(dev);
1557
1558 if (err < 0 && !IS_ERR(dev))
1559 free_netdev(dev);
1560 if (err < 0)
1561 goto out;
1562
1563 err = rtnl_configure_link(dev, ifm);
1564 if (err < 0)
1565 unregister_netdevice(dev);
1566 out:
1567 put_net(dest_net);
1568 return err;
1569 }
1570 }
1571
1572 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
1573 {
1574 struct net *net = sock_net(skb->sk);
1575 struct ifinfomsg *ifm;
1576 char ifname[IFNAMSIZ];
1577 struct nlattr *tb[IFLA_MAX+1];
1578 struct net_device *dev = NULL;
1579 struct sk_buff *nskb;
1580 int err;
1581
1582 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1583 if (err < 0)
1584 return err;
1585
1586 if (tb[IFLA_IFNAME])
1587 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1588
1589 ifm = nlmsg_data(nlh);
1590 if (ifm->ifi_index > 0)
1591 dev = __dev_get_by_index(net, ifm->ifi_index);
1592 else if (tb[IFLA_IFNAME])
1593 dev = __dev_get_by_name(net, ifname);
1594 else
1595 return -EINVAL;
1596
1597 if (dev == NULL)
1598 return -ENODEV;
1599
1600 nskb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL);
1601 if (nskb == NULL)
1602 return -ENOBUFS;
1603
1604 err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).pid,
1605 nlh->nlmsg_seq, 0, 0);
1606 if (err < 0) {
1607 /* -EMSGSIZE implies BUG in if_nlmsg_size */
1608 WARN_ON(err == -EMSGSIZE);
1609 kfree_skb(nskb);
1610 } else
1611 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).pid);
1612
1613 return err;
1614 }
1615
1616 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
1617 {
1618 int idx;
1619 int s_idx = cb->family;
1620
1621 if (s_idx == 0)
1622 s_idx = 1;
1623 for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) {
1624 int type = cb->nlh->nlmsg_type-RTM_BASE;
1625 if (idx < s_idx || idx == PF_PACKET)
1626 continue;
1627 if (rtnl_msg_handlers[idx] == NULL ||
1628 rtnl_msg_handlers[idx][type].dumpit == NULL)
1629 continue;
1630 if (idx > s_idx)
1631 memset(&cb->args[0], 0, sizeof(cb->args));
1632 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb))
1633 break;
1634 }
1635 cb->family = idx;
1636
1637 return skb->len;
1638 }
1639
1640 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change)
1641 {
1642 struct net *net = dev_net(dev);
1643 struct sk_buff *skb;
1644 int err = -ENOBUFS;
1645
1646 skb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL);
1647 if (skb == NULL)
1648 goto errout;
1649
1650 err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0);
1651 if (err < 0) {
1652 /* -EMSGSIZE implies BUG in if_nlmsg_size() */
1653 WARN_ON(err == -EMSGSIZE);
1654 kfree_skb(skb);
1655 goto errout;
1656 }
1657 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_KERNEL);
1658 return;
1659 errout:
1660 if (err < 0)
1661 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
1662 }
1663
1664 /* Protected by RTNL sempahore. */
1665 static struct rtattr **rta_buf;
1666 static int rtattr_max;
1667
1668 /* Process one rtnetlink message. */
1669
1670 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
1671 {
1672 struct net *net = sock_net(skb->sk);
1673 rtnl_doit_func doit;
1674 int sz_idx, kind;
1675 int min_len;
1676 int family;
1677 int type;
1678 int err;
1679
1680 type = nlh->nlmsg_type;
1681 if (type > RTM_MAX)
1682 return -EOPNOTSUPP;
1683
1684 type -= RTM_BASE;
1685
1686 /* All the messages must have at least 1 byte length */
1687 if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg)))
1688 return 0;
1689
1690 family = ((struct rtgenmsg *)NLMSG_DATA(nlh))->rtgen_family;
1691 sz_idx = type>>2;
1692 kind = type&3;
1693
1694 if (kind != 2 && security_netlink_recv(skb, CAP_NET_ADMIN))
1695 return -EPERM;
1696
1697 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
1698 struct sock *rtnl;
1699 rtnl_dumpit_func dumpit;
1700
1701 dumpit = rtnl_get_dumpit(family, type);
1702 if (dumpit == NULL)
1703 return -EOPNOTSUPP;
1704
1705 __rtnl_unlock();
1706 rtnl = net->rtnl;
1707 err = netlink_dump_start(rtnl, skb, nlh, dumpit, NULL);
1708 rtnl_lock();
1709 return err;
1710 }
1711
1712 memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *)));
1713
1714 min_len = rtm_min[sz_idx];
1715 if (nlh->nlmsg_len < min_len)
1716 return -EINVAL;
1717
1718 if (nlh->nlmsg_len > min_len) {
1719 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
1720 struct rtattr *attr = (void *)nlh + NLMSG_ALIGN(min_len);
1721
1722 while (RTA_OK(attr, attrlen)) {
1723 unsigned flavor = attr->rta_type;
1724 if (flavor) {
1725 if (flavor > rta_max[sz_idx])
1726 return -EINVAL;
1727 rta_buf[flavor-1] = attr;
1728 }
1729 attr = RTA_NEXT(attr, attrlen);
1730 }
1731 }
1732
1733 doit = rtnl_get_doit(family, type);
1734 if (doit == NULL)
1735 return -EOPNOTSUPP;
1736
1737 return doit(skb, nlh, (void *)&rta_buf[0]);
1738 }
1739
1740 static void rtnetlink_rcv(struct sk_buff *skb)
1741 {
1742 rtnl_lock();
1743 netlink_rcv_skb(skb, &rtnetlink_rcv_msg);
1744 rtnl_unlock();
1745 }
1746
1747 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
1748 {
1749 struct net_device *dev = ptr;
1750
1751 switch (event) {
1752 case NETDEV_UP:
1753 case NETDEV_DOWN:
1754 case NETDEV_PRE_UP:
1755 case NETDEV_POST_INIT:
1756 case NETDEV_REGISTER:
1757 case NETDEV_CHANGE:
1758 case NETDEV_PRE_TYPE_CHANGE:
1759 case NETDEV_GOING_DOWN:
1760 case NETDEV_UNREGISTER:
1761 case NETDEV_UNREGISTER_BATCH:
1762 break;
1763 default:
1764 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
1765 break;
1766 }
1767 return NOTIFY_DONE;
1768 }
1769
1770 static struct notifier_block rtnetlink_dev_notifier = {
1771 .notifier_call = rtnetlink_event,
1772 };
1773
1774
1775 static int __net_init rtnetlink_net_init(struct net *net)
1776 {
1777 struct sock *sk;
1778 sk = netlink_kernel_create(net, NETLINK_ROUTE, RTNLGRP_MAX,
1779 rtnetlink_rcv, &rtnl_mutex, THIS_MODULE);
1780 if (!sk)
1781 return -ENOMEM;
1782 net->rtnl = sk;
1783 return 0;
1784 }
1785
1786 static void __net_exit rtnetlink_net_exit(struct net *net)
1787 {
1788 netlink_kernel_release(net->rtnl);
1789 net->rtnl = NULL;
1790 }
1791
1792 static struct pernet_operations rtnetlink_net_ops = {
1793 .init = rtnetlink_net_init,
1794 .exit = rtnetlink_net_exit,
1795 };
1796
1797 void __init rtnetlink_init(void)
1798 {
1799 int i;
1800
1801 rtattr_max = 0;
1802 for (i = 0; i < ARRAY_SIZE(rta_max); i++)
1803 if (rta_max[i] > rtattr_max)
1804 rtattr_max = rta_max[i];
1805 rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL);
1806 if (!rta_buf)
1807 panic("rtnetlink_init: cannot allocate rta_buf\n");
1808
1809 if (register_pernet_subsys(&rtnetlink_net_ops))
1810 panic("rtnetlink_init: cannot initialize rtnetlink\n");
1811
1812 netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV);
1813 register_netdevice_notifier(&rtnetlink_dev_notifier);
1814
1815 rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink, rtnl_dump_ifinfo);
1816 rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL);
1817 rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL);
1818 rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL);
1819
1820 rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all);
1821 rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all);
1822 }
1823
Linux kernel - Deliverables
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