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ext4: test the correct variable in ext4_init_pageio()
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / core / rtnetlink.c
blob841c287ef40a4706c3465425880f95abd608e954
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 /**
303 * __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
304 * @ops: struct rtnl_link_ops * to unregister
305 *
306 * The caller must hold the rtnl_mutex.
307 */
308 void __rtnl_link_unregister(struct rtnl_link_ops *ops)
309 {
310 struct net *net;
311
312 for_each_net(net) {
313 __rtnl_kill_links(net, ops);
314 }
315 list_del(&ops->list);
316 }
317 EXPORT_SYMBOL_GPL(__rtnl_link_unregister);
318
319 /**
320 * rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
321 * @ops: struct rtnl_link_ops * to unregister
322 */
323 void rtnl_link_unregister(struct rtnl_link_ops *ops)
324 {
325 rtnl_lock();
326 __rtnl_link_unregister(ops);
327 rtnl_unlock();
328 }
329 EXPORT_SYMBOL_GPL(rtnl_link_unregister);
330
331 static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind)
332 {
333 const struct rtnl_link_ops *ops;
334
335 list_for_each_entry(ops, &link_ops, list) {
336 if (!strcmp(ops->kind, kind))
337 return ops;
338 }
339 return NULL;
340 }
341
342 static size_t rtnl_link_get_size(const struct net_device *dev)
343 {
344 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
345 size_t size;
346
347 if (!ops)
348 return 0;
349
350 size = nla_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */
351 nla_total_size(strlen(ops->kind) + 1); /* IFLA_INFO_KIND */
352
353 if (ops->get_size)
354 /* IFLA_INFO_DATA + nested data */
355 size += nla_total_size(sizeof(struct nlattr)) +
356 ops->get_size(dev);
357
358 if (ops->get_xstats_size)
359 /* IFLA_INFO_XSTATS */
360 size += nla_total_size(ops->get_xstats_size(dev));
361
362 return size;
363 }
364
365 static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev)
366 {
367 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
368 struct nlattr *linkinfo, *data;
369 int err = -EMSGSIZE;
370
371 linkinfo = nla_nest_start(skb, IFLA_LINKINFO);
372 if (linkinfo == NULL)
373 goto out;
374
375 if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0)
376 goto err_cancel_link;
377 if (ops->fill_xstats) {
378 err = ops->fill_xstats(skb, dev);
379 if (err < 0)
380 goto err_cancel_link;
381 }
382 if (ops->fill_info) {
383 data = nla_nest_start(skb, IFLA_INFO_DATA);
384 if (data == NULL)
385 goto err_cancel_link;
386 err = ops->fill_info(skb, dev);
387 if (err < 0)
388 goto err_cancel_data;
389 nla_nest_end(skb, data);
390 }
391
392 nla_nest_end(skb, linkinfo);
393 return 0;
394
395 err_cancel_data:
396 nla_nest_cancel(skb, data);
397 err_cancel_link:
398 nla_nest_cancel(skb, linkinfo);
399 out:
400 return err;
401 }
402
403 static const int rtm_min[RTM_NR_FAMILIES] =
404 {
405 [RTM_FAM(RTM_NEWLINK)] = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
406 [RTM_FAM(RTM_NEWADDR)] = NLMSG_LENGTH(sizeof(struct ifaddrmsg)),
407 [RTM_FAM(RTM_NEWROUTE)] = NLMSG_LENGTH(sizeof(struct rtmsg)),
408 [RTM_FAM(RTM_NEWRULE)] = NLMSG_LENGTH(sizeof(struct fib_rule_hdr)),
409 [RTM_FAM(RTM_NEWQDISC)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
410 [RTM_FAM(RTM_NEWTCLASS)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
411 [RTM_FAM(RTM_NEWTFILTER)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
412 [RTM_FAM(RTM_NEWACTION)] = NLMSG_LENGTH(sizeof(struct tcamsg)),
413 [RTM_FAM(RTM_GETMULTICAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
414 [RTM_FAM(RTM_GETANYCAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
415 };
416
417 static const int rta_max[RTM_NR_FAMILIES] =
418 {
419 [RTM_FAM(RTM_NEWLINK)] = IFLA_MAX,
420 [RTM_FAM(RTM_NEWADDR)] = IFA_MAX,
421 [RTM_FAM(RTM_NEWROUTE)] = RTA_MAX,
422 [RTM_FAM(RTM_NEWRULE)] = FRA_MAX,
423 [RTM_FAM(RTM_NEWQDISC)] = TCA_MAX,
424 [RTM_FAM(RTM_NEWTCLASS)] = TCA_MAX,
425 [RTM_FAM(RTM_NEWTFILTER)] = TCA_MAX,
426 [RTM_FAM(RTM_NEWACTION)] = TCAA_MAX,
427 };
428
429 void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const void *data)
430 {
431 struct rtattr *rta;
432 int size = RTA_LENGTH(attrlen);
433
434 rta = (struct rtattr *)skb_put(skb, RTA_ALIGN(size));
435 rta->rta_type = attrtype;
436 rta->rta_len = size;
437 memcpy(RTA_DATA(rta), data, attrlen);
438 memset(RTA_DATA(rta) + attrlen, 0, RTA_ALIGN(size) - size);
439 }
440 EXPORT_SYMBOL(__rta_fill);
441
442 int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned group, int echo)
443 {
444 struct sock *rtnl = net->rtnl;
445 int err = 0;
446
447 NETLINK_CB(skb).dst_group = group;
448 if (echo)
449 atomic_inc(&skb->users);
450 netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL);
451 if (echo)
452 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
453 return err;
454 }
455
456 int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid)
457 {
458 struct sock *rtnl = net->rtnl;
459
460 return nlmsg_unicast(rtnl, skb, pid);
461 }
462 EXPORT_SYMBOL(rtnl_unicast);
463
464 void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group,
465 struct nlmsghdr *nlh, gfp_t flags)
466 {
467 struct sock *rtnl = net->rtnl;
468 int report = 0;
469
470 if (nlh)
471 report = nlmsg_report(nlh);
472
473 nlmsg_notify(rtnl, skb, pid, group, report, flags);
474 }
475 EXPORT_SYMBOL(rtnl_notify);
476
477 void rtnl_set_sk_err(struct net *net, u32 group, int error)
478 {
479 struct sock *rtnl = net->rtnl;
480
481 netlink_set_err(rtnl, 0, group, error);
482 }
483 EXPORT_SYMBOL(rtnl_set_sk_err);
484
485 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics)
486 {
487 struct nlattr *mx;
488 int i, valid = 0;
489
490 mx = nla_nest_start(skb, RTA_METRICS);
491 if (mx == NULL)
492 return -ENOBUFS;
493
494 for (i = 0; i < RTAX_MAX; i++) {
495 if (metrics[i]) {
496 valid++;
497 NLA_PUT_U32(skb, i+1, metrics[i]);
498 }
499 }
500
501 if (!valid) {
502 nla_nest_cancel(skb, mx);
503 return 0;
504 }
505
506 return nla_nest_end(skb, mx);
507
508 nla_put_failure:
509 nla_nest_cancel(skb, mx);
510 return -EMSGSIZE;
511 }
512 EXPORT_SYMBOL(rtnetlink_put_metrics);
513
514 int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id,
515 u32 ts, u32 tsage, long expires, u32 error)
516 {
517 struct rta_cacheinfo ci = {
518 .rta_lastuse = jiffies_to_clock_t(jiffies - dst->lastuse),
519 .rta_used = dst->__use,
520 .rta_clntref = atomic_read(&(dst->__refcnt)),
521 .rta_error = error,
522 .rta_id = id,
523 .rta_ts = ts,
524 .rta_tsage = tsage,
525 };
526
527 if (expires)
528 ci.rta_expires = jiffies_to_clock_t(expires);
529
530 return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci);
531 }
532 EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo);
533
534 static void set_operstate(struct net_device *dev, unsigned char transition)
535 {
536 unsigned char operstate = dev->operstate;
537
538 switch (transition) {
539 case IF_OPER_UP:
540 if ((operstate == IF_OPER_DORMANT ||
541 operstate == IF_OPER_UNKNOWN) &&
542 !netif_dormant(dev))
543 operstate = IF_OPER_UP;
544 break;
545
546 case IF_OPER_DORMANT:
547 if (operstate == IF_OPER_UP ||
548 operstate == IF_OPER_UNKNOWN)
549 operstate = IF_OPER_DORMANT;
550 break;
551 }
552
553 if (dev->operstate != operstate) {
554 write_lock_bh(&dev_base_lock);
555 dev->operstate = operstate;
556 write_unlock_bh(&dev_base_lock);
557 netdev_state_change(dev);
558 }
559 }
560
561 static unsigned int rtnl_dev_combine_flags(const struct net_device *dev,
562 const struct ifinfomsg *ifm)
563 {
564 unsigned int flags = ifm->ifi_flags;
565
566 /* bugwards compatibility: ifi_change == 0 is treated as ~0 */
567 if (ifm->ifi_change)
568 flags = (flags & ifm->ifi_change) |
569 (dev->flags & ~ifm->ifi_change);
570
571 return flags;
572 }
573
574 static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
575 const struct rtnl_link_stats64 *b)
576 {
577 a->rx_packets = b->rx_packets;
578 a->tx_packets = b->tx_packets;
579 a->rx_bytes = b->rx_bytes;
580 a->tx_bytes = b->tx_bytes;
581 a->rx_errors = b->rx_errors;
582 a->tx_errors = b->tx_errors;
583 a->rx_dropped = b->rx_dropped;
584 a->tx_dropped = b->tx_dropped;
585
586 a->multicast = b->multicast;
587 a->collisions = b->collisions;
588
589 a->rx_length_errors = b->rx_length_errors;
590 a->rx_over_errors = b->rx_over_errors;
591 a->rx_crc_errors = b->rx_crc_errors;
592 a->rx_frame_errors = b->rx_frame_errors;
593 a->rx_fifo_errors = b->rx_fifo_errors;
594 a->rx_missed_errors = b->rx_missed_errors;
595
596 a->tx_aborted_errors = b->tx_aborted_errors;
597 a->tx_carrier_errors = b->tx_carrier_errors;
598 a->tx_fifo_errors = b->tx_fifo_errors;
599 a->tx_heartbeat_errors = b->tx_heartbeat_errors;
600 a->tx_window_errors = b->tx_window_errors;
601
602 a->rx_compressed = b->rx_compressed;
603 a->tx_compressed = b->tx_compressed;
604 }
605
606 static void copy_rtnl_link_stats64(void *v, const struct rtnl_link_stats64 *b)
607 {
608 memcpy(v, b, sizeof(*b));
609 }
610
611 /* All VF info */
612 static inline int rtnl_vfinfo_size(const struct net_device *dev)
613 {
614 if (dev->dev.parent && dev_is_pci(dev->dev.parent)) {
615
616 int num_vfs = dev_num_vf(dev->dev.parent);
617 size_t size = nla_total_size(sizeof(struct nlattr));
618 size += nla_total_size(num_vfs * sizeof(struct nlattr));
619 size += num_vfs *
620 (nla_total_size(sizeof(struct ifla_vf_mac)) +
621 nla_total_size(sizeof(struct ifla_vf_vlan)) +
622 nla_total_size(sizeof(struct ifla_vf_tx_rate)));
623 return size;
624 } else
625 return 0;
626 }
627
628 static size_t rtnl_port_size(const struct net_device *dev)
629 {
630 size_t port_size = nla_total_size(4) /* PORT_VF */
631 + nla_total_size(PORT_PROFILE_MAX) /* PORT_PROFILE */
632 + nla_total_size(sizeof(struct ifla_port_vsi))
633 /* PORT_VSI_TYPE */
634 + nla_total_size(PORT_UUID_MAX) /* PORT_INSTANCE_UUID */
635 + nla_total_size(PORT_UUID_MAX) /* PORT_HOST_UUID */
636 + nla_total_size(1) /* PROT_VDP_REQUEST */
637 + nla_total_size(2); /* PORT_VDP_RESPONSE */
638 size_t vf_ports_size = nla_total_size(sizeof(struct nlattr));
639 size_t vf_port_size = nla_total_size(sizeof(struct nlattr))
640 + port_size;
641 size_t port_self_size = nla_total_size(sizeof(struct nlattr))
642 + port_size;
643
644 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent)
645 return 0;
646 if (dev_num_vf(dev->dev.parent))
647 return port_self_size + vf_ports_size +
648 vf_port_size * dev_num_vf(dev->dev.parent);
649 else
650 return port_self_size;
651 }
652
653 static noinline size_t if_nlmsg_size(const struct net_device *dev)
654 {
655 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
656 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
657 + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */
658 + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */
659 + nla_total_size(sizeof(struct rtnl_link_ifmap))
660 + nla_total_size(sizeof(struct rtnl_link_stats))
661 + nla_total_size(sizeof(struct rtnl_link_stats64))
662 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
663 + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */
664 + nla_total_size(4) /* IFLA_TXQLEN */
665 + nla_total_size(4) /* IFLA_WEIGHT */
666 + nla_total_size(4) /* IFLA_MTU */
667 + nla_total_size(4) /* IFLA_LINK */
668 + nla_total_size(4) /* IFLA_MASTER */
669 + nla_total_size(1) /* IFLA_OPERSTATE */
670 + nla_total_size(1) /* IFLA_LINKMODE */
671 + nla_total_size(4) /* IFLA_NUM_VF */
672 + rtnl_vfinfo_size(dev) /* IFLA_VFINFO_LIST */
673 + rtnl_port_size(dev) /* IFLA_VF_PORTS + IFLA_PORT_SELF */
674 + rtnl_link_get_size(dev); /* IFLA_LINKINFO */
675 }
676
677 static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev)
678 {
679 struct nlattr *vf_ports;
680 struct nlattr *vf_port;
681 int vf;
682 int err;
683
684 vf_ports = nla_nest_start(skb, IFLA_VF_PORTS);
685 if (!vf_ports)
686 return -EMSGSIZE;
687
688 for (vf = 0; vf < dev_num_vf(dev->dev.parent); vf++) {
689 vf_port = nla_nest_start(skb, IFLA_VF_PORT);
690 if (!vf_port)
691 goto nla_put_failure;
692 NLA_PUT_U32(skb, IFLA_PORT_VF, vf);
693 err = dev->netdev_ops->ndo_get_vf_port(dev, vf, skb);
694 if (err == -EMSGSIZE)
695 goto nla_put_failure;
696 if (err) {
697 nla_nest_cancel(skb, vf_port);
698 continue;
699 }
700 nla_nest_end(skb, vf_port);
701 }
702
703 nla_nest_end(skb, vf_ports);
704
705 return 0;
706
707 nla_put_failure:
708 nla_nest_cancel(skb, vf_ports);
709 return -EMSGSIZE;
710 }
711
712 static int rtnl_port_self_fill(struct sk_buff *skb, struct net_device *dev)
713 {
714 struct nlattr *port_self;
715 int err;
716
717 port_self = nla_nest_start(skb, IFLA_PORT_SELF);
718 if (!port_self)
719 return -EMSGSIZE;
720
721 err = dev->netdev_ops->ndo_get_vf_port(dev, PORT_SELF_VF, skb);
722 if (err) {
723 nla_nest_cancel(skb, port_self);
724 return (err == -EMSGSIZE) ? err : 0;
725 }
726
727 nla_nest_end(skb, port_self);
728
729 return 0;
730 }
731
732 static int rtnl_port_fill(struct sk_buff *skb, struct net_device *dev)
733 {
734 int err;
735
736 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent)
737 return 0;
738
739 err = rtnl_port_self_fill(skb, dev);
740 if (err)
741 return err;
742
743 if (dev_num_vf(dev->dev.parent)) {
744 err = rtnl_vf_ports_fill(skb, dev);
745 if (err)
746 return err;
747 }
748
749 return 0;
750 }
751
752 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
753 int type, u32 pid, u32 seq, u32 change,
754 unsigned int flags)
755 {
756 struct ifinfomsg *ifm;
757 struct nlmsghdr *nlh;
758 struct rtnl_link_stats64 temp;
759 const struct rtnl_link_stats64 *stats;
760 struct nlattr *attr;
761
762 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
763 if (nlh == NULL)
764 return -EMSGSIZE;
765
766 ifm = nlmsg_data(nlh);
767 ifm->ifi_family = AF_UNSPEC;
768 ifm->__ifi_pad = 0;
769 ifm->ifi_type = dev->type;
770 ifm->ifi_index = dev->ifindex;
771 ifm->ifi_flags = dev_get_flags(dev);
772 ifm->ifi_change = change;
773
774 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
775 NLA_PUT_U32(skb, IFLA_TXQLEN, dev->tx_queue_len);
776 NLA_PUT_U8(skb, IFLA_OPERSTATE,
777 netif_running(dev) ? dev->operstate : IF_OPER_DOWN);
778 NLA_PUT_U8(skb, IFLA_LINKMODE, dev->link_mode);
779 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
780
781 if (dev->ifindex != dev->iflink)
782 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
783
784 if (dev->master)
785 NLA_PUT_U32(skb, IFLA_MASTER, dev->master->ifindex);
786
787 if (dev->qdisc)
788 NLA_PUT_STRING(skb, IFLA_QDISC, dev->qdisc->ops->id);
789
790 if (dev->ifalias)
791 NLA_PUT_STRING(skb, IFLA_IFALIAS, dev->ifalias);
792
793 if (1) {
794 struct rtnl_link_ifmap map = {
795 .mem_start = dev->mem_start,
796 .mem_end = dev->mem_end,
797 .base_addr = dev->base_addr,
798 .irq = dev->irq,
799 .dma = dev->dma,
800 .port = dev->if_port,
801 };
802 NLA_PUT(skb, IFLA_MAP, sizeof(map), &map);
803 }
804
805 if (dev->addr_len) {
806 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
807 NLA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast);
808 }
809
810 attr = nla_reserve(skb, IFLA_STATS,
811 sizeof(struct rtnl_link_stats));
812 if (attr == NULL)
813 goto nla_put_failure;
814
815 stats = dev_get_stats(dev, &temp);
816 copy_rtnl_link_stats(nla_data(attr), stats);
817
818 attr = nla_reserve(skb, IFLA_STATS64,
819 sizeof(struct rtnl_link_stats64));
820 if (attr == NULL)
821 goto nla_put_failure;
822 copy_rtnl_link_stats64(nla_data(attr), stats);
823
824 if (dev->dev.parent)
825 NLA_PUT_U32(skb, IFLA_NUM_VF, dev_num_vf(dev->dev.parent));
826
827 if (dev->netdev_ops->ndo_get_vf_config && dev->dev.parent) {
828 int i;
829
830 struct nlattr *vfinfo, *vf;
831 int num_vfs = dev_num_vf(dev->dev.parent);
832
833 vfinfo = nla_nest_start(skb, IFLA_VFINFO_LIST);
834 if (!vfinfo)
835 goto nla_put_failure;
836 for (i = 0; i < num_vfs; i++) {
837 struct ifla_vf_info ivi;
838 struct ifla_vf_mac vf_mac;
839 struct ifla_vf_vlan vf_vlan;
840 struct ifla_vf_tx_rate vf_tx_rate;
841 if (dev->netdev_ops->ndo_get_vf_config(dev, i, &ivi))
842 break;
843 vf_mac.vf = vf_vlan.vf = vf_tx_rate.vf = ivi.vf;
844 memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac));
845 vf_vlan.vlan = ivi.vlan;
846 vf_vlan.qos = ivi.qos;
847 vf_tx_rate.rate = ivi.tx_rate;
848 vf = nla_nest_start(skb, IFLA_VF_INFO);
849 if (!vf) {
850 nla_nest_cancel(skb, vfinfo);
851 goto nla_put_failure;
852 }
853 NLA_PUT(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac);
854 NLA_PUT(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan);
855 NLA_PUT(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate), &vf_tx_rate);
856 nla_nest_end(skb, vf);
857 }
858 nla_nest_end(skb, vfinfo);
859 }
860
861 if (rtnl_port_fill(skb, dev))
862 goto nla_put_failure;
863
864 if (dev->rtnl_link_ops) {
865 if (rtnl_link_fill(skb, dev) < 0)
866 goto nla_put_failure;
867 }
868
869 return nlmsg_end(skb, nlh);
870
871 nla_put_failure:
872 nlmsg_cancel(skb, nlh);
873 return -EMSGSIZE;
874 }
875
876 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
877 {
878 struct net *net = sock_net(skb->sk);
879 int h, s_h;
880 int idx = 0, s_idx;
881 struct net_device *dev;
882 struct hlist_head *head;
883 struct hlist_node *node;
884
885 s_h = cb->args[0];
886 s_idx = cb->args[1];
887
888 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
889 idx = 0;
890 head = &net->dev_index_head[h];
891 hlist_for_each_entry(dev, node, head, index_hlist) {
892 if (idx < s_idx)
893 goto cont;
894 if (rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK,
895 NETLINK_CB(cb->skb).pid,
896 cb->nlh->nlmsg_seq, 0,
897 NLM_F_MULTI) <= 0)
898 goto out;
899 cont:
900 idx++;
901 }
902 }
903 out:
904 cb->args[1] = idx;
905 cb->args[0] = h;
906
907 return skb->len;
908 }
909
910 const struct nla_policy ifla_policy[IFLA_MAX+1] = {
911 [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 },
912 [IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
913 [IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
914 [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) },
915 [IFLA_MTU] = { .type = NLA_U32 },
916 [IFLA_LINK] = { .type = NLA_U32 },
917 [IFLA_TXQLEN] = { .type = NLA_U32 },
918 [IFLA_WEIGHT] = { .type = NLA_U32 },
919 [IFLA_OPERSTATE] = { .type = NLA_U8 },
920 [IFLA_LINKMODE] = { .type = NLA_U8 },
921 [IFLA_LINKINFO] = { .type = NLA_NESTED },
922 [IFLA_NET_NS_PID] = { .type = NLA_U32 },
923 [IFLA_IFALIAS] = { .type = NLA_STRING, .len = IFALIASZ-1 },
924 [IFLA_VFINFO_LIST] = {. type = NLA_NESTED },
925 [IFLA_VF_PORTS] = { .type = NLA_NESTED },
926 [IFLA_PORT_SELF] = { .type = NLA_NESTED },
927 };
928 EXPORT_SYMBOL(ifla_policy);
929
930 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
931 [IFLA_INFO_KIND] = { .type = NLA_STRING },
932 [IFLA_INFO_DATA] = { .type = NLA_NESTED },
933 };
934
935 static const struct nla_policy ifla_vfinfo_policy[IFLA_VF_INFO_MAX+1] = {
936 [IFLA_VF_INFO] = { .type = NLA_NESTED },
937 };
938
939 static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = {
940 [IFLA_VF_MAC] = { .type = NLA_BINARY,
941 .len = sizeof(struct ifla_vf_mac) },
942 [IFLA_VF_VLAN] = { .type = NLA_BINARY,
943 .len = sizeof(struct ifla_vf_vlan) },
944 [IFLA_VF_TX_RATE] = { .type = NLA_BINARY,
945 .len = sizeof(struct ifla_vf_tx_rate) },
946 };
947
948 static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = {
949 [IFLA_PORT_VF] = { .type = NLA_U32 },
950 [IFLA_PORT_PROFILE] = { .type = NLA_STRING,
951 .len = PORT_PROFILE_MAX },
952 [IFLA_PORT_VSI_TYPE] = { .type = NLA_BINARY,
953 .len = sizeof(struct ifla_port_vsi)},
954 [IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY,
955 .len = PORT_UUID_MAX },
956 [IFLA_PORT_HOST_UUID] = { .type = NLA_STRING,
957 .len = PORT_UUID_MAX },
958 [IFLA_PORT_REQUEST] = { .type = NLA_U8, },
959 [IFLA_PORT_RESPONSE] = { .type = NLA_U16, },
960 };
961
962 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[])
963 {
964 struct net *net;
965 /* Examine the link attributes and figure out which
966 * network namespace we are talking about.
967 */
968 if (tb[IFLA_NET_NS_PID])
969 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID]));
970 else
971 net = get_net(src_net);
972 return net;
973 }
974 EXPORT_SYMBOL(rtnl_link_get_net);
975
976 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[])
977 {
978 if (dev) {
979 if (tb[IFLA_ADDRESS] &&
980 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
981 return -EINVAL;
982
983 if (tb[IFLA_BROADCAST] &&
984 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
985 return -EINVAL;
986 }
987
988 return 0;
989 }
990
991 static int do_setvfinfo(struct net_device *dev, struct nlattr *attr)
992 {
993 int rem, err = -EINVAL;
994 struct nlattr *vf;
995 const struct net_device_ops *ops = dev->netdev_ops;
996
997 nla_for_each_nested(vf, attr, rem) {
998 switch (nla_type(vf)) {
999 case IFLA_VF_MAC: {
1000 struct ifla_vf_mac *ivm;
1001 ivm = nla_data(vf);
1002 err = -EOPNOTSUPP;
1003 if (ops->ndo_set_vf_mac)
1004 err = ops->ndo_set_vf_mac(dev, ivm->vf,
1005 ivm->mac);
1006 break;
1007 }
1008 case IFLA_VF_VLAN: {
1009 struct ifla_vf_vlan *ivv;
1010 ivv = nla_data(vf);
1011 err = -EOPNOTSUPP;
1012 if (ops->ndo_set_vf_vlan)
1013 err = ops->ndo_set_vf_vlan(dev, ivv->vf,
1014 ivv->vlan,
1015 ivv->qos);
1016 break;
1017 }
1018 case IFLA_VF_TX_RATE: {
1019 struct ifla_vf_tx_rate *ivt;
1020 ivt = nla_data(vf);
1021 err = -EOPNOTSUPP;
1022 if (ops->ndo_set_vf_tx_rate)
1023 err = ops->ndo_set_vf_tx_rate(dev, ivt->vf,
1024 ivt->rate);
1025 break;
1026 }
1027 default:
1028 err = -EINVAL;
1029 break;
1030 }
1031 if (err)
1032 break;
1033 }
1034 return err;
1035 }
1036
1037 static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm,
1038 struct nlattr **tb, char *ifname, int modified)
1039 {
1040 const struct net_device_ops *ops = dev->netdev_ops;
1041 int send_addr_notify = 0;
1042 int err;
1043
1044 if (tb[IFLA_NET_NS_PID]) {
1045 struct net *net = rtnl_link_get_net(dev_net(dev), tb);
1046 if (IS_ERR(net)) {
1047 err = PTR_ERR(net);
1048 goto errout;
1049 }
1050 err = dev_change_net_namespace(dev, net, ifname);
1051 put_net(net);
1052 if (err)
1053 goto errout;
1054 modified = 1;
1055 }
1056
1057 if (tb[IFLA_MAP]) {
1058 struct rtnl_link_ifmap *u_map;
1059 struct ifmap k_map;
1060
1061 if (!ops->ndo_set_config) {
1062 err = -EOPNOTSUPP;
1063 goto errout;
1064 }
1065
1066 if (!netif_device_present(dev)) {
1067 err = -ENODEV;
1068 goto errout;
1069 }
1070
1071 u_map = nla_data(tb[IFLA_MAP]);
1072 k_map.mem_start = (unsigned long) u_map->mem_start;
1073 k_map.mem_end = (unsigned long) u_map->mem_end;
1074 k_map.base_addr = (unsigned short) u_map->base_addr;
1075 k_map.irq = (unsigned char) u_map->irq;
1076 k_map.dma = (unsigned char) u_map->dma;
1077 k_map.port = (unsigned char) u_map->port;
1078
1079 err = ops->ndo_set_config(dev, &k_map);
1080 if (err < 0)
1081 goto errout;
1082
1083 modified = 1;
1084 }
1085
1086 if (tb[IFLA_ADDRESS]) {
1087 struct sockaddr *sa;
1088 int len;
1089
1090 if (!ops->ndo_set_mac_address) {
1091 err = -EOPNOTSUPP;
1092 goto errout;
1093 }
1094
1095 if (!netif_device_present(dev)) {
1096 err = -ENODEV;
1097 goto errout;
1098 }
1099
1100 len = sizeof(sa_family_t) + dev->addr_len;
1101 sa = kmalloc(len, GFP_KERNEL);
1102 if (!sa) {
1103 err = -ENOMEM;
1104 goto errout;
1105 }
1106 sa->sa_family = dev->type;
1107 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
1108 dev->addr_len);
1109 err = ops->ndo_set_mac_address(dev, sa);
1110 kfree(sa);
1111 if (err)
1112 goto errout;
1113 send_addr_notify = 1;
1114 modified = 1;
1115 }
1116
1117 if (tb[IFLA_MTU]) {
1118 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1119 if (err < 0)
1120 goto errout;
1121 modified = 1;
1122 }
1123
1124 /*
1125 * Interface selected by interface index but interface
1126 * name provided implies that a name change has been
1127 * requested.
1128 */
1129 if (ifm->ifi_index > 0 && ifname[0]) {
1130 err = dev_change_name(dev, ifname);
1131 if (err < 0)
1132 goto errout;
1133 modified = 1;
1134 }
1135
1136 if (tb[IFLA_IFALIAS]) {
1137 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]),
1138 nla_len(tb[IFLA_IFALIAS]));
1139 if (err < 0)
1140 goto errout;
1141 modified = 1;
1142 }
1143
1144 if (tb[IFLA_BROADCAST]) {
1145 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
1146 send_addr_notify = 1;
1147 }
1148
1149 if (ifm->ifi_flags || ifm->ifi_change) {
1150 err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
1151 if (err < 0)
1152 goto errout;
1153 }
1154
1155 if (tb[IFLA_TXQLEN])
1156 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
1157
1158 if (tb[IFLA_OPERSTATE])
1159 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
1160
1161 if (tb[IFLA_LINKMODE]) {
1162 write_lock_bh(&dev_base_lock);
1163 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
1164 write_unlock_bh(&dev_base_lock);
1165 }
1166
1167 if (tb[IFLA_VFINFO_LIST]) {
1168 struct nlattr *attr;
1169 int rem;
1170 nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) {
1171 if (nla_type(attr) != IFLA_VF_INFO) {
1172 err = -EINVAL;
1173 goto errout;
1174 }
1175 err = do_setvfinfo(dev, attr);
1176 if (err < 0)
1177 goto errout;
1178 modified = 1;
1179 }
1180 }
1181 err = 0;
1182
1183 if (tb[IFLA_VF_PORTS]) {
1184 struct nlattr *port[IFLA_PORT_MAX+1];
1185 struct nlattr *attr;
1186 int vf;
1187 int rem;
1188
1189 err = -EOPNOTSUPP;
1190 if (!ops->ndo_set_vf_port)
1191 goto errout;
1192
1193 nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) {
1194 if (nla_type(attr) != IFLA_VF_PORT)
1195 continue;
1196 err = nla_parse_nested(port, IFLA_PORT_MAX,
1197 attr, ifla_port_policy);
1198 if (err < 0)
1199 goto errout;
1200 if (!port[IFLA_PORT_VF]) {
1201 err = -EOPNOTSUPP;
1202 goto errout;
1203 }
1204 vf = nla_get_u32(port[IFLA_PORT_VF]);
1205 err = ops->ndo_set_vf_port(dev, vf, port);
1206 if (err < 0)
1207 goto errout;
1208 modified = 1;
1209 }
1210 }
1211 err = 0;
1212
1213 if (tb[IFLA_PORT_SELF]) {
1214 struct nlattr *port[IFLA_PORT_MAX+1];
1215
1216 err = nla_parse_nested(port, IFLA_PORT_MAX,
1217 tb[IFLA_PORT_SELF], ifla_port_policy);
1218 if (err < 0)
1219 goto errout;
1220
1221 err = -EOPNOTSUPP;
1222 if (ops->ndo_set_vf_port)
1223 err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port);
1224 if (err < 0)
1225 goto errout;
1226 modified = 1;
1227 }
1228 err = 0;
1229
1230 errout:
1231 if (err < 0 && modified && net_ratelimit())
1232 printk(KERN_WARNING "A link change request failed with "
1233 "some changes comitted already. Interface %s may "
1234 "have been left with an inconsistent configuration, "
1235 "please check.\n", dev->name);
1236
1237 if (send_addr_notify)
1238 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
1239 return err;
1240 }
1241
1242 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
1243 {
1244 struct net *net = sock_net(skb->sk);
1245 struct ifinfomsg *ifm;
1246 struct net_device *dev;
1247 int err;
1248 struct nlattr *tb[IFLA_MAX+1];
1249 char ifname[IFNAMSIZ];
1250
1251 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1252 if (err < 0)
1253 goto errout;
1254
1255 if (tb[IFLA_IFNAME])
1256 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1257 else
1258 ifname[0] = '\0';
1259
1260 err = -EINVAL;
1261 ifm = nlmsg_data(nlh);
1262 if (ifm->ifi_index > 0)
1263 dev = __dev_get_by_index(net, ifm->ifi_index);
1264 else if (tb[IFLA_IFNAME])
1265 dev = __dev_get_by_name(net, ifname);
1266 else
1267 goto errout;
1268
1269 if (dev == NULL) {
1270 err = -ENODEV;
1271 goto errout;
1272 }
1273
1274 err = validate_linkmsg(dev, tb);
1275 if (err < 0)
1276 goto errout;
1277
1278 err = do_setlink(dev, ifm, tb, ifname, 0);
1279 errout:
1280 return err;
1281 }
1282
1283 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
1284 {
1285 struct net *net = sock_net(skb->sk);
1286 const struct rtnl_link_ops *ops;
1287 struct net_device *dev;
1288 struct ifinfomsg *ifm;
1289 char ifname[IFNAMSIZ];
1290 struct nlattr *tb[IFLA_MAX+1];
1291 int err;
1292
1293 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1294 if (err < 0)
1295 return err;
1296
1297 if (tb[IFLA_IFNAME])
1298 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1299
1300 ifm = nlmsg_data(nlh);
1301 if (ifm->ifi_index > 0)
1302 dev = __dev_get_by_index(net, ifm->ifi_index);
1303 else if (tb[IFLA_IFNAME])
1304 dev = __dev_get_by_name(net, ifname);
1305 else
1306 return -EINVAL;
1307
1308 if (!dev)
1309 return -ENODEV;
1310
1311 ops = dev->rtnl_link_ops;
1312 if (!ops)
1313 return -EOPNOTSUPP;
1314
1315 ops->dellink(dev, NULL);
1316 return 0;
1317 }
1318
1319 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm)
1320 {
1321 unsigned int old_flags;
1322 int err;
1323
1324 old_flags = dev->flags;
1325 if (ifm && (ifm->ifi_flags || ifm->ifi_change)) {
1326 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
1327 if (err < 0)
1328 return err;
1329 }
1330
1331 dev->rtnl_link_state = RTNL_LINK_INITIALIZED;
1332 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
1333
1334 __dev_notify_flags(dev, old_flags);
1335 return 0;
1336 }
1337 EXPORT_SYMBOL(rtnl_configure_link);
1338
1339 struct net_device *rtnl_create_link(struct net *src_net, struct net *net,
1340 char *ifname, const struct rtnl_link_ops *ops, struct nlattr *tb[])
1341 {
1342 int err;
1343 struct net_device *dev;
1344 unsigned int num_queues = 1;
1345 unsigned int real_num_queues = 1;
1346
1347 if (ops->get_tx_queues) {
1348 err = ops->get_tx_queues(src_net, tb, &num_queues,
1349 &real_num_queues);
1350 if (err)
1351 goto err;
1352 }
1353 err = -ENOMEM;
1354 dev = alloc_netdev_mq(ops->priv_size, ifname, ops->setup, num_queues);
1355 if (!dev)
1356 goto err;
1357
1358 dev_net_set(dev, net);
1359 dev->rtnl_link_ops = ops;
1360 dev->rtnl_link_state = RTNL_LINK_INITIALIZING;
1361 dev->real_num_tx_queues = real_num_queues;
1362
1363 if (strchr(dev->name, '%')) {
1364 err = dev_alloc_name(dev, dev->name);
1365 if (err < 0)
1366 goto err_free;
1367 }
1368
1369 if (tb[IFLA_MTU])
1370 dev->mtu = nla_get_u32(tb[IFLA_MTU]);
1371 if (tb[IFLA_ADDRESS])
1372 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]),
1373 nla_len(tb[IFLA_ADDRESS]));
1374 if (tb[IFLA_BROADCAST])
1375 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]),
1376 nla_len(tb[IFLA_BROADCAST]));
1377 if (tb[IFLA_TXQLEN])
1378 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
1379 if (tb[IFLA_OPERSTATE])
1380 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
1381 if (tb[IFLA_LINKMODE])
1382 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
1383
1384 return dev;
1385
1386 err_free:
1387 free_netdev(dev);
1388 err:
1389 return ERR_PTR(err);
1390 }
1391 EXPORT_SYMBOL(rtnl_create_link);
1392
1393 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
1394 {
1395 struct net *net = sock_net(skb->sk);
1396 const struct rtnl_link_ops *ops;
1397 struct net_device *dev;
1398 struct ifinfomsg *ifm;
1399 char kind[MODULE_NAME_LEN];
1400 char ifname[IFNAMSIZ];
1401 struct nlattr *tb[IFLA_MAX+1];
1402 struct nlattr *linkinfo[IFLA_INFO_MAX+1];
1403 int err;
1404
1405 #ifdef CONFIG_MODULES
1406 replay:
1407 #endif
1408 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1409 if (err < 0)
1410 return err;
1411
1412 if (tb[IFLA_IFNAME])
1413 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1414 else
1415 ifname[0] = '\0';
1416
1417 ifm = nlmsg_data(nlh);
1418 if (ifm->ifi_index > 0)
1419 dev = __dev_get_by_index(net, ifm->ifi_index);
1420 else if (ifname[0])
1421 dev = __dev_get_by_name(net, ifname);
1422 else
1423 dev = NULL;
1424
1425 err = validate_linkmsg(dev, tb);
1426 if (err < 0)
1427 return err;
1428
1429 if (tb[IFLA_LINKINFO]) {
1430 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX,
1431 tb[IFLA_LINKINFO], ifla_info_policy);
1432 if (err < 0)
1433 return err;
1434 } else
1435 memset(linkinfo, 0, sizeof(linkinfo));
1436
1437 if (linkinfo[IFLA_INFO_KIND]) {
1438 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind));
1439 ops = rtnl_link_ops_get(kind);
1440 } else {
1441 kind[0] = '\0';
1442 ops = NULL;
1443 }
1444
1445 if (1) {
1446 struct nlattr *attr[ops ? ops->maxtype + 1 : 0], **data = NULL;
1447 struct net *dest_net;
1448
1449 if (ops) {
1450 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
1451 err = nla_parse_nested(attr, ops->maxtype,
1452 linkinfo[IFLA_INFO_DATA],
1453 ops->policy);
1454 if (err < 0)
1455 return err;
1456 data = attr;
1457 }
1458 if (ops->validate) {
1459 err = ops->validate(tb, data);
1460 if (err < 0)
1461 return err;
1462 }
1463 }
1464
1465 if (dev) {
1466 int modified = 0;
1467
1468 if (nlh->nlmsg_flags & NLM_F_EXCL)
1469 return -EEXIST;
1470 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1471 return -EOPNOTSUPP;
1472
1473 if (linkinfo[IFLA_INFO_DATA]) {
1474 if (!ops || ops != dev->rtnl_link_ops ||
1475 !ops->changelink)
1476 return -EOPNOTSUPP;
1477
1478 err = ops->changelink(dev, tb, data);
1479 if (err < 0)
1480 return err;
1481 modified = 1;
1482 }
1483
1484 return do_setlink(dev, ifm, tb, ifname, modified);
1485 }
1486
1487 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
1488 return -ENODEV;
1489
1490 if (ifm->ifi_index)
1491 return -EOPNOTSUPP;
1492 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO])
1493 return -EOPNOTSUPP;
1494
1495 if (!ops) {
1496 #ifdef CONFIG_MODULES
1497 if (kind[0]) {
1498 __rtnl_unlock();
1499 request_module("rtnl-link-%s", kind);
1500 rtnl_lock();
1501 ops = rtnl_link_ops_get(kind);
1502 if (ops)
1503 goto replay;
1504 }
1505 #endif
1506 return -EOPNOTSUPP;
1507 }
1508
1509 if (!ifname[0])
1510 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
1511
1512 dest_net = rtnl_link_get_net(net, tb);
1513 dev = rtnl_create_link(net, dest_net, ifname, ops, tb);
1514
1515 if (IS_ERR(dev))
1516 err = PTR_ERR(dev);
1517 else if (ops->newlink)
1518 err = ops->newlink(net, dev, tb, data);
1519 else
1520 err = register_netdevice(dev);
1521
1522 if (err < 0 && !IS_ERR(dev))
1523 free_netdev(dev);
1524 if (err < 0)
1525 goto out;
1526
1527 err = rtnl_configure_link(dev, ifm);
1528 if (err < 0)
1529 unregister_netdevice(dev);
1530 out:
1531 put_net(dest_net);
1532 return err;
1533 }
1534 }
1535
1536 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
1537 {
1538 struct net *net = sock_net(skb->sk);
1539 struct ifinfomsg *ifm;
1540 char ifname[IFNAMSIZ];
1541 struct nlattr *tb[IFLA_MAX+1];
1542 struct net_device *dev = NULL;
1543 struct sk_buff *nskb;
1544 int err;
1545
1546 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1547 if (err < 0)
1548 return err;
1549
1550 if (tb[IFLA_IFNAME])
1551 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1552
1553 ifm = nlmsg_data(nlh);
1554 if (ifm->ifi_index > 0)
1555 dev = __dev_get_by_index(net, ifm->ifi_index);
1556 else if (tb[IFLA_IFNAME])
1557 dev = __dev_get_by_name(net, ifname);
1558 else
1559 return -EINVAL;
1560
1561 if (dev == NULL)
1562 return -ENODEV;
1563
1564 nskb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL);
1565 if (nskb == NULL)
1566 return -ENOBUFS;
1567
1568 err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).pid,
1569 nlh->nlmsg_seq, 0, 0);
1570 if (err < 0) {
1571 /* -EMSGSIZE implies BUG in if_nlmsg_size */
1572 WARN_ON(err == -EMSGSIZE);
1573 kfree_skb(nskb);
1574 } else
1575 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).pid);
1576
1577 return err;
1578 }
1579
1580 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
1581 {
1582 int idx;
1583 int s_idx = cb->family;
1584
1585 if (s_idx == 0)
1586 s_idx = 1;
1587 for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) {
1588 int type = cb->nlh->nlmsg_type-RTM_BASE;
1589 if (idx < s_idx || idx == PF_PACKET)
1590 continue;
1591 if (rtnl_msg_handlers[idx] == NULL ||
1592 rtnl_msg_handlers[idx][type].dumpit == NULL)
1593 continue;
1594 if (idx > s_idx)
1595 memset(&cb->args[0], 0, sizeof(cb->args));
1596 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb))
1597 break;
1598 }
1599 cb->family = idx;
1600
1601 return skb->len;
1602 }
1603
1604 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change)
1605 {
1606 struct net *net = dev_net(dev);
1607 struct sk_buff *skb;
1608 int err = -ENOBUFS;
1609
1610 skb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL);
1611 if (skb == NULL)
1612 goto errout;
1613
1614 err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0);
1615 if (err < 0) {
1616 /* -EMSGSIZE implies BUG in if_nlmsg_size() */
1617 WARN_ON(err == -EMSGSIZE);
1618 kfree_skb(skb);
1619 goto errout;
1620 }
1621 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_KERNEL);
1622 return;
1623 errout:
1624 if (err < 0)
1625 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
1626 }
1627
1628 /* Protected by RTNL sempahore. */
1629 static struct rtattr **rta_buf;
1630 static int rtattr_max;
1631
1632 /* Process one rtnetlink message. */
1633
1634 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
1635 {
1636 struct net *net = sock_net(skb->sk);
1637 rtnl_doit_func doit;
1638 int sz_idx, kind;
1639 int min_len;
1640 int family;
1641 int type;
1642 int err;
1643
1644 type = nlh->nlmsg_type;
1645 if (type > RTM_MAX)
1646 return -EOPNOTSUPP;
1647
1648 type -= RTM_BASE;
1649
1650 /* All the messages must have at least 1 byte length */
1651 if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg)))
1652 return 0;
1653
1654 family = ((struct rtgenmsg *)NLMSG_DATA(nlh))->rtgen_family;
1655 sz_idx = type>>2;
1656 kind = type&3;
1657
1658 if (kind != 2 && security_netlink_recv(skb, CAP_NET_ADMIN))
1659 return -EPERM;
1660
1661 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
1662 struct sock *rtnl;
1663 rtnl_dumpit_func dumpit;
1664
1665 dumpit = rtnl_get_dumpit(family, type);
1666 if (dumpit == NULL)
1667 return -EOPNOTSUPP;
1668
1669 __rtnl_unlock();
1670 rtnl = net->rtnl;
1671 err = netlink_dump_start(rtnl, skb, nlh, dumpit, NULL);
1672 rtnl_lock();
1673 return err;
1674 }
1675
1676 memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *)));
1677
1678 min_len = rtm_min[sz_idx];
1679 if (nlh->nlmsg_len < min_len)
1680 return -EINVAL;
1681
1682 if (nlh->nlmsg_len > min_len) {
1683 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
1684 struct rtattr *attr = (void *)nlh + NLMSG_ALIGN(min_len);
1685
1686 while (RTA_OK(attr, attrlen)) {
1687 unsigned flavor = attr->rta_type;
1688 if (flavor) {
1689 if (flavor > rta_max[sz_idx])
1690 return -EINVAL;
1691 rta_buf[flavor-1] = attr;
1692 }
1693 attr = RTA_NEXT(attr, attrlen);
1694 }
1695 }
1696
1697 doit = rtnl_get_doit(family, type);
1698 if (doit == NULL)
1699 return -EOPNOTSUPP;
1700
1701 return doit(skb, nlh, (void *)&rta_buf[0]);
1702 }
1703
1704 static void rtnetlink_rcv(struct sk_buff *skb)
1705 {
1706 rtnl_lock();
1707 netlink_rcv_skb(skb, &rtnetlink_rcv_msg);
1708 rtnl_unlock();
1709 }
1710
1711 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
1712 {
1713 struct net_device *dev = ptr;
1714
1715 switch (event) {
1716 case NETDEV_UP:
1717 case NETDEV_DOWN:
1718 case NETDEV_PRE_UP:
1719 case NETDEV_POST_INIT:
1720 case NETDEV_REGISTER:
1721 case NETDEV_CHANGE:
1722 case NETDEV_PRE_TYPE_CHANGE:
1723 case NETDEV_GOING_DOWN:
1724 case NETDEV_UNREGISTER:
1725 case NETDEV_UNREGISTER_BATCH:
1726 break;
1727 default:
1728 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
1729 break;
1730 }
1731 return NOTIFY_DONE;
1732 }
1733
1734 static struct notifier_block rtnetlink_dev_notifier = {
1735 .notifier_call = rtnetlink_event,
1736 };
1737
1738
1739 static int __net_init rtnetlink_net_init(struct net *net)
1740 {
1741 struct sock *sk;
1742 sk = netlink_kernel_create(net, NETLINK_ROUTE, RTNLGRP_MAX,
1743 rtnetlink_rcv, &rtnl_mutex, THIS_MODULE);
1744 if (!sk)
1745 return -ENOMEM;
1746 net->rtnl = sk;
1747 return 0;
1748 }
1749
1750 static void __net_exit rtnetlink_net_exit(struct net *net)
1751 {
1752 netlink_kernel_release(net->rtnl);
1753 net->rtnl = NULL;
1754 }
1755
1756 static struct pernet_operations rtnetlink_net_ops = {
1757 .init = rtnetlink_net_init,
1758 .exit = rtnetlink_net_exit,
1759 };
1760
1761 void __init rtnetlink_init(void)
1762 {
1763 int i;
1764
1765 rtattr_max = 0;
1766 for (i = 0; i < ARRAY_SIZE(rta_max); i++)
1767 if (rta_max[i] > rtattr_max)
1768 rtattr_max = rta_max[i];
1769 rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL);
1770 if (!rta_buf)
1771 panic("rtnetlink_init: cannot allocate rta_buf\n");
1772
1773 if (register_pernet_subsys(&rtnetlink_net_ops))
1774 panic("rtnetlink_init: cannot initialize rtnetlink\n");
1775
1776 netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV);
1777 register_netdevice_notifier(&rtnetlink_dev_notifier);
1778
1779 rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink, rtnl_dump_ifinfo);
1780 rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL);
1781 rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL);
1782 rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL);
1783
1784 rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all);
1785 rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all);
1786 }
1787
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree