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Merge branch 'docs-next' of git://git.lwn.net/linux-2.6
[mirror_ubuntu-hirsute-kernel.git] / net / core / rtnetlink.c
1 /*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * Routing netlink socket interface: protocol independent part.
7 *
8 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
14 *
15 * Fixes:
16 * Vitaly E. Lavrov RTA_OK arithmetics was wrong.
17 */
18
19 #include <linux/errno.h>
20 #include <linux/module.h>
21 #include <linux/types.h>
22 #include <linux/socket.h>
23 #include <linux/kernel.h>
24 #include <linux/timer.h>
25 #include <linux/string.h>
26 #include <linux/sockios.h>
27 #include <linux/net.h>
28 #include <linux/fcntl.h>
29 #include <linux/mm.h>
30 #include <linux/slab.h>
31 #include <linux/interrupt.h>
32 #include <linux/capability.h>
33 #include <linux/skbuff.h>
34 #include <linux/init.h>
35 #include <linux/security.h>
36 #include <linux/mutex.h>
37 #include <linux/if_addr.h>
38 #include <linux/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[NPROTO];
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 tab = rtnl_msg_handlers[protocol];
122 if (tab == NULL || tab[msgindex].doit == NULL)
123 tab = rtnl_msg_handlers[PF_UNSPEC];
124
125 return tab ? tab[msgindex].doit : NULL;
126 }
127
128 static rtnl_dumpit_func rtnl_get_dumpit(int protocol, int msgindex)
129 {
130 struct rtnl_link *tab;
131
132 tab = rtnl_msg_handlers[protocol];
133 if (tab == NULL || tab[msgindex].dumpit == NULL)
134 tab = rtnl_msg_handlers[PF_UNSPEC];
135
136 return tab ? tab[msgindex].dumpit : NULL;
137 }
138
139 /**
140 * __rtnl_register - Register a rtnetlink message type
141 * @protocol: Protocol family or PF_UNSPEC
142 * @msgtype: rtnetlink message type
143 * @doit: Function pointer called for each request message
144 * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message
145 *
146 * Registers the specified function pointers (at least one of them has
147 * to be non-NULL) to be called whenever a request message for the
148 * specified protocol family and message type is received.
149 *
150 * The special protocol family PF_UNSPEC may be used to define fallback
151 * function pointers for the case when no entry for the specific protocol
152 * family exists.
153 *
154 * Returns 0 on success or a negative error code.
155 */
156 int __rtnl_register(int protocol, int msgtype,
157 rtnl_doit_func doit, rtnl_dumpit_func dumpit)
158 {
159 struct rtnl_link *tab;
160 int msgindex;
161
162 BUG_ON(protocol < 0 || protocol >= NPROTO);
163 msgindex = rtm_msgindex(msgtype);
164
165 tab = rtnl_msg_handlers[protocol];
166 if (tab == NULL) {
167 tab = kcalloc(RTM_NR_MSGTYPES, sizeof(*tab), GFP_KERNEL);
168 if (tab == NULL)
169 return -ENOBUFS;
170
171 rtnl_msg_handlers[protocol] = tab;
172 }
173
174 if (doit)
175 tab[msgindex].doit = doit;
176
177 if (dumpit)
178 tab[msgindex].dumpit = dumpit;
179
180 return 0;
181 }
182 EXPORT_SYMBOL_GPL(__rtnl_register);
183
184 /**
185 * rtnl_register - Register a rtnetlink message type
186 *
187 * Identical to __rtnl_register() but panics on failure. This is useful
188 * as failure of this function is very unlikely, it can only happen due
189 * to lack of memory when allocating the chain to store all message
190 * handlers for a protocol. Meant for use in init functions where lack
191 * of memory implies no sense in continueing.
192 */
193 void rtnl_register(int protocol, int msgtype,
194 rtnl_doit_func doit, rtnl_dumpit_func dumpit)
195 {
196 if (__rtnl_register(protocol, msgtype, doit, dumpit) < 0)
197 panic("Unable to register rtnetlink message handler, "
198 "protocol = %d, message type = %d\n",
199 protocol, msgtype);
200 }
201 EXPORT_SYMBOL_GPL(rtnl_register);
202
203 /**
204 * rtnl_unregister - Unregister a rtnetlink message type
205 * @protocol: Protocol family or PF_UNSPEC
206 * @msgtype: rtnetlink message type
207 *
208 * Returns 0 on success or a negative error code.
209 */
210 int rtnl_unregister(int protocol, int msgtype)
211 {
212 int msgindex;
213
214 BUG_ON(protocol < 0 || protocol >= NPROTO);
215 msgindex = rtm_msgindex(msgtype);
216
217 if (rtnl_msg_handlers[protocol] == NULL)
218 return -ENOENT;
219
220 rtnl_msg_handlers[protocol][msgindex].doit = NULL;
221 rtnl_msg_handlers[protocol][msgindex].dumpit = NULL;
222
223 return 0;
224 }
225 EXPORT_SYMBOL_GPL(rtnl_unregister);
226
227 /**
228 * rtnl_unregister_all - Unregister all rtnetlink message type of a protocol
229 * @protocol : Protocol family or PF_UNSPEC
230 *
231 * Identical to calling rtnl_unregster() for all registered message types
232 * of a certain protocol family.
233 */
234 void rtnl_unregister_all(int protocol)
235 {
236 BUG_ON(protocol < 0 || protocol >= NPROTO);
237
238 kfree(rtnl_msg_handlers[protocol]);
239 rtnl_msg_handlers[protocol] = NULL;
240 }
241 EXPORT_SYMBOL_GPL(rtnl_unregister_all);
242
243 static LIST_HEAD(link_ops);
244
245 /**
246 * __rtnl_link_register - Register rtnl_link_ops with rtnetlink.
247 * @ops: struct rtnl_link_ops * to register
248 *
249 * The caller must hold the rtnl_mutex. This function should be used
250 * by drivers that create devices during module initialization. It
251 * must be called before registering the devices.
252 *
253 * Returns 0 on success or a negative error code.
254 */
255 int __rtnl_link_register(struct rtnl_link_ops *ops)
256 {
257 if (!ops->dellink)
258 ops->dellink = unregister_netdevice_queue;
259
260 list_add_tail(&ops->list, &link_ops);
261 return 0;
262 }
263 EXPORT_SYMBOL_GPL(__rtnl_link_register);
264
265 /**
266 * rtnl_link_register - Register rtnl_link_ops with rtnetlink.
267 * @ops: struct rtnl_link_ops * to register
268 *
269 * Returns 0 on success or a negative error code.
270 */
271 int rtnl_link_register(struct rtnl_link_ops *ops)
272 {
273 int err;
274
275 rtnl_lock();
276 err = __rtnl_link_register(ops);
277 rtnl_unlock();
278 return err;
279 }
280 EXPORT_SYMBOL_GPL(rtnl_link_register);
281
282 static void __rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops)
283 {
284 struct net_device *dev;
285 LIST_HEAD(list_kill);
286
287 for_each_netdev(net, dev) {
288 if (dev->rtnl_link_ops == ops)
289 ops->dellink(dev, &list_kill);
290 }
291 unregister_netdevice_many(&list_kill);
292 }
293
294 void rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops)
295 {
296 rtnl_lock();
297 __rtnl_kill_links(net, ops);
298 rtnl_unlock();
299 }
300 EXPORT_SYMBOL_GPL(rtnl_kill_links);
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 = nlmsg_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */
351 nlmsg_total_size(strlen(ops->kind) + 1); /* IFLA_INFO_KIND */
352
353 if (ops->get_size)
354 /* IFLA_INFO_DATA + nested data */
355 size += nlmsg_total_size(sizeof(struct nlattr)) +
356 ops->get_size(dev);
357
358 if (ops->get_xstats_size)
359 size += ops->get_xstats_size(dev); /* IFLA_INFO_XSTATS */
360
361 return size;
362 }
363
364 static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev)
365 {
366 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
367 struct nlattr *linkinfo, *data;
368 int err = -EMSGSIZE;
369
370 linkinfo = nla_nest_start(skb, IFLA_LINKINFO);
371 if (linkinfo == NULL)
372 goto out;
373
374 if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0)
375 goto err_cancel_link;
376 if (ops->fill_xstats) {
377 err = ops->fill_xstats(skb, dev);
378 if (err < 0)
379 goto err_cancel_link;
380 }
381 if (ops->fill_info) {
382 data = nla_nest_start(skb, IFLA_INFO_DATA);
383 if (data == NULL)
384 goto err_cancel_link;
385 err = ops->fill_info(skb, dev);
386 if (err < 0)
387 goto err_cancel_data;
388 nla_nest_end(skb, data);
389 }
390
391 nla_nest_end(skb, linkinfo);
392 return 0;
393
394 err_cancel_data:
395 nla_nest_cancel(skb, data);
396 err_cancel_link:
397 nla_nest_cancel(skb, linkinfo);
398 out:
399 return err;
400 }
401
402 static const int rtm_min[RTM_NR_FAMILIES] =
403 {
404 [RTM_FAM(RTM_NEWLINK)] = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
405 [RTM_FAM(RTM_NEWADDR)] = NLMSG_LENGTH(sizeof(struct ifaddrmsg)),
406 [RTM_FAM(RTM_NEWROUTE)] = NLMSG_LENGTH(sizeof(struct rtmsg)),
407 [RTM_FAM(RTM_NEWRULE)] = NLMSG_LENGTH(sizeof(struct fib_rule_hdr)),
408 [RTM_FAM(RTM_NEWQDISC)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
409 [RTM_FAM(RTM_NEWTCLASS)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
410 [RTM_FAM(RTM_NEWTFILTER)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
411 [RTM_FAM(RTM_NEWACTION)] = NLMSG_LENGTH(sizeof(struct tcamsg)),
412 [RTM_FAM(RTM_GETMULTICAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
413 [RTM_FAM(RTM_GETANYCAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
414 };
415
416 static const int rta_max[RTM_NR_FAMILIES] =
417 {
418 [RTM_FAM(RTM_NEWLINK)] = IFLA_MAX,
419 [RTM_FAM(RTM_NEWADDR)] = IFA_MAX,
420 [RTM_FAM(RTM_NEWROUTE)] = RTA_MAX,
421 [RTM_FAM(RTM_NEWRULE)] = FRA_MAX,
422 [RTM_FAM(RTM_NEWQDISC)] = TCA_MAX,
423 [RTM_FAM(RTM_NEWTCLASS)] = TCA_MAX,
424 [RTM_FAM(RTM_NEWTFILTER)] = TCA_MAX,
425 [RTM_FAM(RTM_NEWACTION)] = TCAA_MAX,
426 };
427
428 void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const void *data)
429 {
430 struct rtattr *rta;
431 int size = RTA_LENGTH(attrlen);
432
433 rta = (struct rtattr *)skb_put(skb, RTA_ALIGN(size));
434 rta->rta_type = attrtype;
435 rta->rta_len = size;
436 memcpy(RTA_DATA(rta), data, attrlen);
437 memset(RTA_DATA(rta) + attrlen, 0, RTA_ALIGN(size) - size);
438 }
439 EXPORT_SYMBOL(__rta_fill);
440
441 int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned group, int echo)
442 {
443 struct sock *rtnl = net->rtnl;
444 int err = 0;
445
446 NETLINK_CB(skb).dst_group = group;
447 if (echo)
448 atomic_inc(&skb->users);
449 netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL);
450 if (echo)
451 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
452 return err;
453 }
454
455 int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid)
456 {
457 struct sock *rtnl = net->rtnl;
458
459 return nlmsg_unicast(rtnl, skb, pid);
460 }
461 EXPORT_SYMBOL(rtnl_unicast);
462
463 void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group,
464 struct nlmsghdr *nlh, gfp_t flags)
465 {
466 struct sock *rtnl = net->rtnl;
467 int report = 0;
468
469 if (nlh)
470 report = nlmsg_report(nlh);
471
472 nlmsg_notify(rtnl, skb, pid, group, report, flags);
473 }
474 EXPORT_SYMBOL(rtnl_notify);
475
476 void rtnl_set_sk_err(struct net *net, u32 group, int error)
477 {
478 struct sock *rtnl = net->rtnl;
479
480 netlink_set_err(rtnl, 0, group, error);
481 }
482 EXPORT_SYMBOL(rtnl_set_sk_err);
483
484 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics)
485 {
486 struct nlattr *mx;
487 int i, valid = 0;
488
489 mx = nla_nest_start(skb, RTA_METRICS);
490 if (mx == NULL)
491 return -ENOBUFS;
492
493 for (i = 0; i < RTAX_MAX; i++) {
494 if (metrics[i]) {
495 valid++;
496 NLA_PUT_U32(skb, i+1, metrics[i]);
497 }
498 }
499
500 if (!valid) {
501 nla_nest_cancel(skb, mx);
502 return 0;
503 }
504
505 return nla_nest_end(skb, mx);
506
507 nla_put_failure:
508 nla_nest_cancel(skb, mx);
509 return -EMSGSIZE;
510 }
511 EXPORT_SYMBOL(rtnetlink_put_metrics);
512
513 int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id,
514 u32 ts, u32 tsage, long expires, u32 error)
515 {
516 struct rta_cacheinfo ci = {
517 .rta_lastuse = jiffies_to_clock_t(jiffies - dst->lastuse),
518 .rta_used = dst->__use,
519 .rta_clntref = atomic_read(&(dst->__refcnt)),
520 .rta_error = error,
521 .rta_id = id,
522 .rta_ts = ts,
523 .rta_tsage = tsage,
524 };
525
526 if (expires)
527 ci.rta_expires = jiffies_to_clock_t(expires);
528
529 return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci);
530 }
531 EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo);
532
533 static void set_operstate(struct net_device *dev, unsigned char transition)
534 {
535 unsigned char operstate = dev->operstate;
536
537 switch (transition) {
538 case IF_OPER_UP:
539 if ((operstate == IF_OPER_DORMANT ||
540 operstate == IF_OPER_UNKNOWN) &&
541 !netif_dormant(dev))
542 operstate = IF_OPER_UP;
543 break;
544
545 case IF_OPER_DORMANT:
546 if (operstate == IF_OPER_UP ||
547 operstate == IF_OPER_UNKNOWN)
548 operstate = IF_OPER_DORMANT;
549 break;
550 }
551
552 if (dev->operstate != operstate) {
553 write_lock_bh(&dev_base_lock);
554 dev->operstate = operstate;
555 write_unlock_bh(&dev_base_lock);
556 netdev_state_change(dev);
557 }
558 }
559
560 static unsigned int rtnl_dev_combine_flags(const struct net_device *dev,
561 const struct ifinfomsg *ifm)
562 {
563 unsigned int flags = ifm->ifi_flags;
564
565 /* bugwards compatibility: ifi_change == 0 is treated as ~0 */
566 if (ifm->ifi_change)
567 flags = (flags & ifm->ifi_change) |
568 (dev->flags & ~ifm->ifi_change);
569
570 return flags;
571 }
572
573 static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
574 const struct net_device_stats *b)
575 {
576 a->rx_packets = b->rx_packets;
577 a->tx_packets = b->tx_packets;
578 a->rx_bytes = b->rx_bytes;
579 a->tx_bytes = b->tx_bytes;
580 a->rx_errors = b->rx_errors;
581 a->tx_errors = b->tx_errors;
582 a->rx_dropped = b->rx_dropped;
583 a->tx_dropped = b->tx_dropped;
584
585 a->multicast = b->multicast;
586 a->collisions = b->collisions;
587
588 a->rx_length_errors = b->rx_length_errors;
589 a->rx_over_errors = b->rx_over_errors;
590 a->rx_crc_errors = b->rx_crc_errors;
591 a->rx_frame_errors = b->rx_frame_errors;
592 a->rx_fifo_errors = b->rx_fifo_errors;
593 a->rx_missed_errors = b->rx_missed_errors;
594
595 a->tx_aborted_errors = b->tx_aborted_errors;
596 a->tx_carrier_errors = b->tx_carrier_errors;
597 a->tx_fifo_errors = b->tx_fifo_errors;
598 a->tx_heartbeat_errors = b->tx_heartbeat_errors;
599 a->tx_window_errors = b->tx_window_errors;
600
601 a->rx_compressed = b->rx_compressed;
602 a->tx_compressed = b->tx_compressed;
603 };
604
605 /* All VF info */
606 static inline int rtnl_vfinfo_size(const struct net_device *dev)
607 {
608 if (dev->dev.parent && dev_is_pci(dev->dev.parent)) {
609
610 int num_vfs = dev_num_vf(dev->dev.parent);
611 size_t size = nlmsg_total_size(sizeof(struct nlattr));
612 size += nlmsg_total_size(num_vfs * sizeof(struct nlattr));
613 size += num_vfs * (sizeof(struct ifla_vf_mac) +
614 sizeof(struct ifla_vf_vlan) +
615 sizeof(struct ifla_vf_tx_rate));
616 return size;
617 } else
618 return 0;
619 }
620
621 static inline size_t if_nlmsg_size(const struct net_device *dev)
622 {
623 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
624 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
625 + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */
626 + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */
627 + nla_total_size(sizeof(struct rtnl_link_ifmap))
628 + nla_total_size(sizeof(struct rtnl_link_stats))
629 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
630 + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */
631 + nla_total_size(4) /* IFLA_TXQLEN */
632 + nla_total_size(4) /* IFLA_WEIGHT */
633 + nla_total_size(4) /* IFLA_MTU */
634 + nla_total_size(4) /* IFLA_LINK */
635 + nla_total_size(4) /* IFLA_MASTER */
636 + nla_total_size(1) /* IFLA_OPERSTATE */
637 + nla_total_size(1) /* IFLA_LINKMODE */
638 + nla_total_size(4) /* IFLA_NUM_VF */
639 + rtnl_vfinfo_size(dev) /* IFLA_VFINFO_LIST */
640 + rtnl_link_get_size(dev); /* IFLA_LINKINFO */
641 }
642
643 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
644 int type, u32 pid, u32 seq, u32 change,
645 unsigned int flags)
646 {
647 struct ifinfomsg *ifm;
648 struct nlmsghdr *nlh;
649 const struct net_device_stats *stats;
650 struct nlattr *attr;
651
652 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
653 if (nlh == NULL)
654 return -EMSGSIZE;
655
656 ifm = nlmsg_data(nlh);
657 ifm->ifi_family = AF_UNSPEC;
658 ifm->__ifi_pad = 0;
659 ifm->ifi_type = dev->type;
660 ifm->ifi_index = dev->ifindex;
661 ifm->ifi_flags = dev_get_flags(dev);
662 ifm->ifi_change = change;
663
664 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
665 NLA_PUT_U32(skb, IFLA_TXQLEN, dev->tx_queue_len);
666 NLA_PUT_U8(skb, IFLA_OPERSTATE,
667 netif_running(dev) ? dev->operstate : IF_OPER_DOWN);
668 NLA_PUT_U8(skb, IFLA_LINKMODE, dev->link_mode);
669 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
670
671 if (dev->ifindex != dev->iflink)
672 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
673
674 if (dev->master)
675 NLA_PUT_U32(skb, IFLA_MASTER, dev->master->ifindex);
676
677 if (dev->qdisc)
678 NLA_PUT_STRING(skb, IFLA_QDISC, dev->qdisc->ops->id);
679
680 if (dev->ifalias)
681 NLA_PUT_STRING(skb, IFLA_IFALIAS, dev->ifalias);
682
683 if (1) {
684 struct rtnl_link_ifmap map = {
685 .mem_start = dev->mem_start,
686 .mem_end = dev->mem_end,
687 .base_addr = dev->base_addr,
688 .irq = dev->irq,
689 .dma = dev->dma,
690 .port = dev->if_port,
691 };
692 NLA_PUT(skb, IFLA_MAP, sizeof(map), &map);
693 }
694
695 if (dev->addr_len) {
696 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
697 NLA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast);
698 }
699
700 attr = nla_reserve(skb, IFLA_STATS,
701 sizeof(struct rtnl_link_stats));
702 if (attr == NULL)
703 goto nla_put_failure;
704
705 stats = dev_get_stats(dev);
706 copy_rtnl_link_stats(nla_data(attr), stats);
707
708 if (dev->netdev_ops->ndo_get_vf_config && dev->dev.parent) {
709 int i;
710
711 struct nlattr *vfinfo, *vf;
712 int num_vfs = dev_num_vf(dev->dev.parent);
713
714 NLA_PUT_U32(skb, IFLA_NUM_VF, num_vfs);
715 vfinfo = nla_nest_start(skb, IFLA_VFINFO_LIST);
716 if (!vfinfo)
717 goto nla_put_failure;
718 for (i = 0; i < num_vfs; i++) {
719 struct ifla_vf_info ivi;
720 struct ifla_vf_mac vf_mac;
721 struct ifla_vf_vlan vf_vlan;
722 struct ifla_vf_tx_rate vf_tx_rate;
723 if (dev->netdev_ops->ndo_get_vf_config(dev, i, &ivi))
724 break;
725 vf_mac.vf = vf_vlan.vf = vf_tx_rate.vf = ivi.vf;
726 memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac));
727 vf_vlan.vlan = ivi.vlan;
728 vf_vlan.qos = ivi.qos;
729 vf_tx_rate.rate = ivi.tx_rate;
730 vf = nla_nest_start(skb, IFLA_VF_INFO);
731 if (!vf) {
732 nla_nest_cancel(skb, vfinfo);
733 goto nla_put_failure;
734 }
735 NLA_PUT(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac);
736 NLA_PUT(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan);
737 NLA_PUT(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate), &vf_tx_rate);
738 nla_nest_end(skb, vf);
739 }
740 nla_nest_end(skb, vfinfo);
741 }
742 if (dev->rtnl_link_ops) {
743 if (rtnl_link_fill(skb, dev) < 0)
744 goto nla_put_failure;
745 }
746
747 return nlmsg_end(skb, nlh);
748
749 nla_put_failure:
750 nlmsg_cancel(skb, nlh);
751 return -EMSGSIZE;
752 }
753
754 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
755 {
756 struct net *net = sock_net(skb->sk);
757 int h, s_h;
758 int idx = 0, s_idx;
759 struct net_device *dev;
760 struct hlist_head *head;
761 struct hlist_node *node;
762
763 s_h = cb->args[0];
764 s_idx = cb->args[1];
765
766 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
767 idx = 0;
768 head = &net->dev_index_head[h];
769 hlist_for_each_entry(dev, node, head, index_hlist) {
770 if (idx < s_idx)
771 goto cont;
772 if (rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK,
773 NETLINK_CB(cb->skb).pid,
774 cb->nlh->nlmsg_seq, 0,
775 NLM_F_MULTI) <= 0)
776 goto out;
777 cont:
778 idx++;
779 }
780 }
781 out:
782 cb->args[1] = idx;
783 cb->args[0] = h;
784
785 return skb->len;
786 }
787
788 const struct nla_policy ifla_policy[IFLA_MAX+1] = {
789 [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 },
790 [IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
791 [IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
792 [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) },
793 [IFLA_MTU] = { .type = NLA_U32 },
794 [IFLA_LINK] = { .type = NLA_U32 },
795 [IFLA_TXQLEN] = { .type = NLA_U32 },
796 [IFLA_WEIGHT] = { .type = NLA_U32 },
797 [IFLA_OPERSTATE] = { .type = NLA_U8 },
798 [IFLA_LINKMODE] = { .type = NLA_U8 },
799 [IFLA_LINKINFO] = { .type = NLA_NESTED },
800 [IFLA_NET_NS_PID] = { .type = NLA_U32 },
801 [IFLA_IFALIAS] = { .type = NLA_STRING, .len = IFALIASZ-1 },
802 [IFLA_VFINFO_LIST] = {. type = NLA_NESTED },
803 };
804 EXPORT_SYMBOL(ifla_policy);
805
806 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
807 [IFLA_INFO_KIND] = { .type = NLA_STRING },
808 [IFLA_INFO_DATA] = { .type = NLA_NESTED },
809 };
810
811 static const struct nla_policy ifla_vfinfo_policy[IFLA_VF_INFO_MAX+1] = {
812 [IFLA_VF_INFO] = { .type = NLA_NESTED },
813 };
814
815 static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = {
816 [IFLA_VF_MAC] = { .type = NLA_BINARY,
817 .len = sizeof(struct ifla_vf_mac) },
818 [IFLA_VF_VLAN] = { .type = NLA_BINARY,
819 .len = sizeof(struct ifla_vf_vlan) },
820 [IFLA_VF_TX_RATE] = { .type = NLA_BINARY,
821 .len = sizeof(struct ifla_vf_tx_rate) },
822 };
823
824 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[])
825 {
826 struct net *net;
827 /* Examine the link attributes and figure out which
828 * network namespace we are talking about.
829 */
830 if (tb[IFLA_NET_NS_PID])
831 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID]));
832 else
833 net = get_net(src_net);
834 return net;
835 }
836 EXPORT_SYMBOL(rtnl_link_get_net);
837
838 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[])
839 {
840 if (dev) {
841 if (tb[IFLA_ADDRESS] &&
842 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
843 return -EINVAL;
844
845 if (tb[IFLA_BROADCAST] &&
846 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
847 return -EINVAL;
848 }
849
850 return 0;
851 }
852
853 static int do_setvfinfo(struct net_device *dev, struct nlattr *attr)
854 {
855 int rem, err = -EINVAL;
856 struct nlattr *vf;
857 const struct net_device_ops *ops = dev->netdev_ops;
858
859 nla_for_each_nested(vf, attr, rem) {
860 switch (nla_type(vf)) {
861 case IFLA_VF_MAC: {
862 struct ifla_vf_mac *ivm;
863 ivm = nla_data(vf);
864 err = -EOPNOTSUPP;
865 if (ops->ndo_set_vf_mac)
866 err = ops->ndo_set_vf_mac(dev, ivm->vf,
867 ivm->mac);
868 break;
869 }
870 case IFLA_VF_VLAN: {
871 struct ifla_vf_vlan *ivv;
872 ivv = nla_data(vf);
873 err = -EOPNOTSUPP;
874 if (ops->ndo_set_vf_vlan)
875 err = ops->ndo_set_vf_vlan(dev, ivv->vf,
876 ivv->vlan,
877 ivv->qos);
878 break;
879 }
880 case IFLA_VF_TX_RATE: {
881 struct ifla_vf_tx_rate *ivt;
882 ivt = nla_data(vf);
883 err = -EOPNOTSUPP;
884 if (ops->ndo_set_vf_tx_rate)
885 err = ops->ndo_set_vf_tx_rate(dev, ivt->vf,
886 ivt->rate);
887 break;
888 }
889 default:
890 err = -EINVAL;
891 break;
892 }
893 if (err)
894 break;
895 }
896 return err;
897 }
898
899 static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm,
900 struct nlattr **tb, char *ifname, int modified)
901 {
902 const struct net_device_ops *ops = dev->netdev_ops;
903 int send_addr_notify = 0;
904 int err;
905
906 if (tb[IFLA_NET_NS_PID]) {
907 struct net *net = rtnl_link_get_net(dev_net(dev), tb);
908 if (IS_ERR(net)) {
909 err = PTR_ERR(net);
910 goto errout;
911 }
912 err = dev_change_net_namespace(dev, net, ifname);
913 put_net(net);
914 if (err)
915 goto errout;
916 modified = 1;
917 }
918
919 if (tb[IFLA_MAP]) {
920 struct rtnl_link_ifmap *u_map;
921 struct ifmap k_map;
922
923 if (!ops->ndo_set_config) {
924 err = -EOPNOTSUPP;
925 goto errout;
926 }
927
928 if (!netif_device_present(dev)) {
929 err = -ENODEV;
930 goto errout;
931 }
932
933 u_map = nla_data(tb[IFLA_MAP]);
934 k_map.mem_start = (unsigned long) u_map->mem_start;
935 k_map.mem_end = (unsigned long) u_map->mem_end;
936 k_map.base_addr = (unsigned short) u_map->base_addr;
937 k_map.irq = (unsigned char) u_map->irq;
938 k_map.dma = (unsigned char) u_map->dma;
939 k_map.port = (unsigned char) u_map->port;
940
941 err = ops->ndo_set_config(dev, &k_map);
942 if (err < 0)
943 goto errout;
944
945 modified = 1;
946 }
947
948 if (tb[IFLA_ADDRESS]) {
949 struct sockaddr *sa;
950 int len;
951
952 if (!ops->ndo_set_mac_address) {
953 err = -EOPNOTSUPP;
954 goto errout;
955 }
956
957 if (!netif_device_present(dev)) {
958 err = -ENODEV;
959 goto errout;
960 }
961
962 len = sizeof(sa_family_t) + dev->addr_len;
963 sa = kmalloc(len, GFP_KERNEL);
964 if (!sa) {
965 err = -ENOMEM;
966 goto errout;
967 }
968 sa->sa_family = dev->type;
969 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
970 dev->addr_len);
971 err = ops->ndo_set_mac_address(dev, sa);
972 kfree(sa);
973 if (err)
974 goto errout;
975 send_addr_notify = 1;
976 modified = 1;
977 }
978
979 if (tb[IFLA_MTU]) {
980 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
981 if (err < 0)
982 goto errout;
983 modified = 1;
984 }
985
986 /*
987 * Interface selected by interface index but interface
988 * name provided implies that a name change has been
989 * requested.
990 */
991 if (ifm->ifi_index > 0 && ifname[0]) {
992 err = dev_change_name(dev, ifname);
993 if (err < 0)
994 goto errout;
995 modified = 1;
996 }
997
998 if (tb[IFLA_IFALIAS]) {
999 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]),
1000 nla_len(tb[IFLA_IFALIAS]));
1001 if (err < 0)
1002 goto errout;
1003 modified = 1;
1004 }
1005
1006 if (tb[IFLA_BROADCAST]) {
1007 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
1008 send_addr_notify = 1;
1009 }
1010
1011 if (ifm->ifi_flags || ifm->ifi_change) {
1012 err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
1013 if (err < 0)
1014 goto errout;
1015 }
1016
1017 if (tb[IFLA_TXQLEN])
1018 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
1019
1020 if (tb[IFLA_OPERSTATE])
1021 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
1022
1023 if (tb[IFLA_LINKMODE]) {
1024 write_lock_bh(&dev_base_lock);
1025 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
1026 write_unlock_bh(&dev_base_lock);
1027 }
1028
1029 if (tb[IFLA_VFINFO_LIST]) {
1030 struct nlattr *attr;
1031 int rem;
1032 nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) {
1033 if (nla_type(attr) != IFLA_VF_INFO)
1034 goto errout;
1035 err = do_setvfinfo(dev, attr);
1036 if (err < 0)
1037 goto errout;
1038 modified = 1;
1039 }
1040 }
1041 err = 0;
1042
1043 errout:
1044 if (err < 0 && modified && net_ratelimit())
1045 printk(KERN_WARNING "A link change request failed with "
1046 "some changes comitted already. Interface %s may "
1047 "have been left with an inconsistent configuration, "
1048 "please check.\n", dev->name);
1049
1050 if (send_addr_notify)
1051 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
1052 return err;
1053 }
1054
1055 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
1056 {
1057 struct net *net = sock_net(skb->sk);
1058 struct ifinfomsg *ifm;
1059 struct net_device *dev;
1060 int err;
1061 struct nlattr *tb[IFLA_MAX+1];
1062 char ifname[IFNAMSIZ];
1063
1064 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1065 if (err < 0)
1066 goto errout;
1067
1068 if (tb[IFLA_IFNAME])
1069 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1070 else
1071 ifname[0] = '\0';
1072
1073 err = -EINVAL;
1074 ifm = nlmsg_data(nlh);
1075 if (ifm->ifi_index > 0)
1076 dev = __dev_get_by_index(net, ifm->ifi_index);
1077 else if (tb[IFLA_IFNAME])
1078 dev = __dev_get_by_name(net, ifname);
1079 else
1080 goto errout;
1081
1082 if (dev == NULL) {
1083 err = -ENODEV;
1084 goto errout;
1085 }
1086
1087 err = validate_linkmsg(dev, tb);
1088 if (err < 0)
1089 goto errout;
1090
1091 err = do_setlink(dev, ifm, tb, ifname, 0);
1092 errout:
1093 return err;
1094 }
1095
1096 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
1097 {
1098 struct net *net = sock_net(skb->sk);
1099 const struct rtnl_link_ops *ops;
1100 struct net_device *dev;
1101 struct ifinfomsg *ifm;
1102 char ifname[IFNAMSIZ];
1103 struct nlattr *tb[IFLA_MAX+1];
1104 int err;
1105
1106 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1107 if (err < 0)
1108 return err;
1109
1110 if (tb[IFLA_IFNAME])
1111 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1112
1113 ifm = nlmsg_data(nlh);
1114 if (ifm->ifi_index > 0)
1115 dev = __dev_get_by_index(net, ifm->ifi_index);
1116 else if (tb[IFLA_IFNAME])
1117 dev = __dev_get_by_name(net, ifname);
1118 else
1119 return -EINVAL;
1120
1121 if (!dev)
1122 return -ENODEV;
1123
1124 ops = dev->rtnl_link_ops;
1125 if (!ops)
1126 return -EOPNOTSUPP;
1127
1128 ops->dellink(dev, NULL);
1129 return 0;
1130 }
1131
1132 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm)
1133 {
1134 unsigned int old_flags;
1135 int err;
1136
1137 old_flags = dev->flags;
1138 if (ifm && (ifm->ifi_flags || ifm->ifi_change)) {
1139 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
1140 if (err < 0)
1141 return err;
1142 }
1143
1144 dev->rtnl_link_state = RTNL_LINK_INITIALIZED;
1145 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
1146
1147 __dev_notify_flags(dev, old_flags);
1148 return 0;
1149 }
1150 EXPORT_SYMBOL(rtnl_configure_link);
1151
1152 struct net_device *rtnl_create_link(struct net *src_net, struct net *net,
1153 char *ifname, const struct rtnl_link_ops *ops, struct nlattr *tb[])
1154 {
1155 int err;
1156 struct net_device *dev;
1157 unsigned int num_queues = 1;
1158 unsigned int real_num_queues = 1;
1159
1160 if (ops->get_tx_queues) {
1161 err = ops->get_tx_queues(src_net, tb, &num_queues,
1162 &real_num_queues);
1163 if (err)
1164 goto err;
1165 }
1166 err = -ENOMEM;
1167 dev = alloc_netdev_mq(ops->priv_size, ifname, ops->setup, num_queues);
1168 if (!dev)
1169 goto err;
1170
1171 dev_net_set(dev, net);
1172 dev->rtnl_link_ops = ops;
1173 dev->rtnl_link_state = RTNL_LINK_INITIALIZING;
1174 dev->real_num_tx_queues = real_num_queues;
1175
1176 if (strchr(dev->name, '%')) {
1177 err = dev_alloc_name(dev, dev->name);
1178 if (err < 0)
1179 goto err_free;
1180 }
1181
1182 if (tb[IFLA_MTU])
1183 dev->mtu = nla_get_u32(tb[IFLA_MTU]);
1184 if (tb[IFLA_ADDRESS])
1185 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]),
1186 nla_len(tb[IFLA_ADDRESS]));
1187 if (tb[IFLA_BROADCAST])
1188 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]),
1189 nla_len(tb[IFLA_BROADCAST]));
1190 if (tb[IFLA_TXQLEN])
1191 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
1192 if (tb[IFLA_OPERSTATE])
1193 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
1194 if (tb[IFLA_LINKMODE])
1195 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
1196
1197 return dev;
1198
1199 err_free:
1200 free_netdev(dev);
1201 err:
1202 return ERR_PTR(err);
1203 }
1204 EXPORT_SYMBOL(rtnl_create_link);
1205
1206 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
1207 {
1208 struct net *net = sock_net(skb->sk);
1209 const struct rtnl_link_ops *ops;
1210 struct net_device *dev;
1211 struct ifinfomsg *ifm;
1212 char kind[MODULE_NAME_LEN];
1213 char ifname[IFNAMSIZ];
1214 struct nlattr *tb[IFLA_MAX+1];
1215 struct nlattr *linkinfo[IFLA_INFO_MAX+1];
1216 int err;
1217
1218 #ifdef CONFIG_MODULES
1219 replay:
1220 #endif
1221 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1222 if (err < 0)
1223 return err;
1224
1225 if (tb[IFLA_IFNAME])
1226 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1227 else
1228 ifname[0] = '\0';
1229
1230 ifm = nlmsg_data(nlh);
1231 if (ifm->ifi_index > 0)
1232 dev = __dev_get_by_index(net, ifm->ifi_index);
1233 else if (ifname[0])
1234 dev = __dev_get_by_name(net, ifname);
1235 else
1236 dev = NULL;
1237
1238 err = validate_linkmsg(dev, tb);
1239 if (err < 0)
1240 return err;
1241
1242 if (tb[IFLA_LINKINFO]) {
1243 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX,
1244 tb[IFLA_LINKINFO], ifla_info_policy);
1245 if (err < 0)
1246 return err;
1247 } else
1248 memset(linkinfo, 0, sizeof(linkinfo));
1249
1250 if (linkinfo[IFLA_INFO_KIND]) {
1251 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind));
1252 ops = rtnl_link_ops_get(kind);
1253 } else {
1254 kind[0] = '\0';
1255 ops = NULL;
1256 }
1257
1258 if (1) {
1259 struct nlattr *attr[ops ? ops->maxtype + 1 : 0], **data = NULL;
1260 struct net *dest_net;
1261
1262 if (ops) {
1263 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
1264 err = nla_parse_nested(attr, ops->maxtype,
1265 linkinfo[IFLA_INFO_DATA],
1266 ops->policy);
1267 if (err < 0)
1268 return err;
1269 data = attr;
1270 }
1271 if (ops->validate) {
1272 err = ops->validate(tb, data);
1273 if (err < 0)
1274 return err;
1275 }
1276 }
1277
1278 if (dev) {
1279 int modified = 0;
1280
1281 if (nlh->nlmsg_flags & NLM_F_EXCL)
1282 return -EEXIST;
1283 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1284 return -EOPNOTSUPP;
1285
1286 if (linkinfo[IFLA_INFO_DATA]) {
1287 if (!ops || ops != dev->rtnl_link_ops ||
1288 !ops->changelink)
1289 return -EOPNOTSUPP;
1290
1291 err = ops->changelink(dev, tb, data);
1292 if (err < 0)
1293 return err;
1294 modified = 1;
1295 }
1296
1297 return do_setlink(dev, ifm, tb, ifname, modified);
1298 }
1299
1300 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
1301 return -ENODEV;
1302
1303 if (ifm->ifi_index)
1304 return -EOPNOTSUPP;
1305 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO])
1306 return -EOPNOTSUPP;
1307
1308 if (!ops) {
1309 #ifdef CONFIG_MODULES
1310 if (kind[0]) {
1311 __rtnl_unlock();
1312 request_module("rtnl-link-%s", kind);
1313 rtnl_lock();
1314 ops = rtnl_link_ops_get(kind);
1315 if (ops)
1316 goto replay;
1317 }
1318 #endif
1319 return -EOPNOTSUPP;
1320 }
1321
1322 if (!ifname[0])
1323 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
1324
1325 dest_net = rtnl_link_get_net(net, tb);
1326 dev = rtnl_create_link(net, dest_net, ifname, ops, tb);
1327
1328 if (IS_ERR(dev))
1329 err = PTR_ERR(dev);
1330 else if (ops->newlink)
1331 err = ops->newlink(net, dev, tb, data);
1332 else
1333 err = register_netdevice(dev);
1334
1335 if (err < 0 && !IS_ERR(dev))
1336 free_netdev(dev);
1337 if (err < 0)
1338 goto out;
1339
1340 err = rtnl_configure_link(dev, ifm);
1341 if (err < 0)
1342 unregister_netdevice(dev);
1343 out:
1344 put_net(dest_net);
1345 return err;
1346 }
1347 }
1348
1349 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
1350 {
1351 struct net *net = sock_net(skb->sk);
1352 struct ifinfomsg *ifm;
1353 char ifname[IFNAMSIZ];
1354 struct nlattr *tb[IFLA_MAX+1];
1355 struct net_device *dev = NULL;
1356 struct sk_buff *nskb;
1357 int err;
1358
1359 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1360 if (err < 0)
1361 return err;
1362
1363 if (tb[IFLA_IFNAME])
1364 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1365
1366 ifm = nlmsg_data(nlh);
1367 if (ifm->ifi_index > 0)
1368 dev = __dev_get_by_index(net, ifm->ifi_index);
1369 else if (tb[IFLA_IFNAME])
1370 dev = __dev_get_by_name(net, ifname);
1371 else
1372 return -EINVAL;
1373
1374 if (dev == NULL)
1375 return -ENODEV;
1376
1377 nskb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL);
1378 if (nskb == NULL)
1379 return -ENOBUFS;
1380
1381 err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).pid,
1382 nlh->nlmsg_seq, 0, 0);
1383 if (err < 0) {
1384 /* -EMSGSIZE implies BUG in if_nlmsg_size */
1385 WARN_ON(err == -EMSGSIZE);
1386 kfree_skb(nskb);
1387 } else
1388 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).pid);
1389
1390 return err;
1391 }
1392
1393 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
1394 {
1395 int idx;
1396 int s_idx = cb->family;
1397
1398 if (s_idx == 0)
1399 s_idx = 1;
1400 for (idx = 1; idx < NPROTO; idx++) {
1401 int type = cb->nlh->nlmsg_type-RTM_BASE;
1402 if (idx < s_idx || idx == PF_PACKET)
1403 continue;
1404 if (rtnl_msg_handlers[idx] == NULL ||
1405 rtnl_msg_handlers[idx][type].dumpit == NULL)
1406 continue;
1407 if (idx > s_idx)
1408 memset(&cb->args[0], 0, sizeof(cb->args));
1409 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb))
1410 break;
1411 }
1412 cb->family = idx;
1413
1414 return skb->len;
1415 }
1416
1417 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change)
1418 {
1419 struct net *net = dev_net(dev);
1420 struct sk_buff *skb;
1421 int err = -ENOBUFS;
1422
1423 skb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL);
1424 if (skb == NULL)
1425 goto errout;
1426
1427 err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0);
1428 if (err < 0) {
1429 /* -EMSGSIZE implies BUG in if_nlmsg_size() */
1430 WARN_ON(err == -EMSGSIZE);
1431 kfree_skb(skb);
1432 goto errout;
1433 }
1434 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_KERNEL);
1435 return;
1436 errout:
1437 if (err < 0)
1438 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
1439 }
1440
1441 /* Protected by RTNL sempahore. */
1442 static struct rtattr **rta_buf;
1443 static int rtattr_max;
1444
1445 /* Process one rtnetlink message. */
1446
1447 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
1448 {
1449 struct net *net = sock_net(skb->sk);
1450 rtnl_doit_func doit;
1451 int sz_idx, kind;
1452 int min_len;
1453 int family;
1454 int type;
1455 int err;
1456
1457 type = nlh->nlmsg_type;
1458 if (type > RTM_MAX)
1459 return -EOPNOTSUPP;
1460
1461 type -= RTM_BASE;
1462
1463 /* All the messages must have at least 1 byte length */
1464 if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg)))
1465 return 0;
1466
1467 family = ((struct rtgenmsg *)NLMSG_DATA(nlh))->rtgen_family;
1468 if (family >= NPROTO)
1469 return -EAFNOSUPPORT;
1470
1471 sz_idx = type>>2;
1472 kind = type&3;
1473
1474 if (kind != 2 && security_netlink_recv(skb, CAP_NET_ADMIN))
1475 return -EPERM;
1476
1477 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
1478 struct sock *rtnl;
1479 rtnl_dumpit_func dumpit;
1480
1481 dumpit = rtnl_get_dumpit(family, type);
1482 if (dumpit == NULL)
1483 return -EOPNOTSUPP;
1484
1485 __rtnl_unlock();
1486 rtnl = net->rtnl;
1487 err = netlink_dump_start(rtnl, skb, nlh, dumpit, NULL);
1488 rtnl_lock();
1489 return err;
1490 }
1491
1492 memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *)));
1493
1494 min_len = rtm_min[sz_idx];
1495 if (nlh->nlmsg_len < min_len)
1496 return -EINVAL;
1497
1498 if (nlh->nlmsg_len > min_len) {
1499 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
1500 struct rtattr *attr = (void *)nlh + NLMSG_ALIGN(min_len);
1501
1502 while (RTA_OK(attr, attrlen)) {
1503 unsigned flavor = attr->rta_type;
1504 if (flavor) {
1505 if (flavor > rta_max[sz_idx])
1506 return -EINVAL;
1507 rta_buf[flavor-1] = attr;
1508 }
1509 attr = RTA_NEXT(attr, attrlen);
1510 }
1511 }
1512
1513 doit = rtnl_get_doit(family, type);
1514 if (doit == NULL)
1515 return -EOPNOTSUPP;
1516
1517 return doit(skb, nlh, (void *)&rta_buf[0]);
1518 }
1519
1520 static void rtnetlink_rcv(struct sk_buff *skb)
1521 {
1522 rtnl_lock();
1523 netlink_rcv_skb(skb, &rtnetlink_rcv_msg);
1524 rtnl_unlock();
1525 }
1526
1527 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
1528 {
1529 struct net_device *dev = ptr;
1530
1531 switch (event) {
1532 case NETDEV_UP:
1533 case NETDEV_DOWN:
1534 case NETDEV_PRE_UP:
1535 case NETDEV_POST_INIT:
1536 case NETDEV_REGISTER:
1537 case NETDEV_CHANGE:
1538 case NETDEV_GOING_DOWN:
1539 case NETDEV_UNREGISTER:
1540 case NETDEV_UNREGISTER_BATCH:
1541 break;
1542 default:
1543 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
1544 break;
1545 }
1546 return NOTIFY_DONE;
1547 }
1548
1549 static struct notifier_block rtnetlink_dev_notifier = {
1550 .notifier_call = rtnetlink_event,
1551 };
1552
1553
1554 static int __net_init rtnetlink_net_init(struct net *net)
1555 {
1556 struct sock *sk;
1557 sk = netlink_kernel_create(net, NETLINK_ROUTE, RTNLGRP_MAX,
1558 rtnetlink_rcv, &rtnl_mutex, THIS_MODULE);
1559 if (!sk)
1560 return -ENOMEM;
1561 net->rtnl = sk;
1562 return 0;
1563 }
1564
1565 static void __net_exit rtnetlink_net_exit(struct net *net)
1566 {
1567 netlink_kernel_release(net->rtnl);
1568 net->rtnl = NULL;
1569 }
1570
1571 static struct pernet_operations rtnetlink_net_ops = {
1572 .init = rtnetlink_net_init,
1573 .exit = rtnetlink_net_exit,
1574 };
1575
1576 void __init rtnetlink_init(void)
1577 {
1578 int i;
1579
1580 rtattr_max = 0;
1581 for (i = 0; i < ARRAY_SIZE(rta_max); i++)
1582 if (rta_max[i] > rtattr_max)
1583 rtattr_max = rta_max[i];
1584 rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL);
1585 if (!rta_buf)
1586 panic("rtnetlink_init: cannot allocate rta_buf\n");
1587
1588 if (register_pernet_subsys(&rtnetlink_net_ops))
1589 panic("rtnetlink_init: cannot initialize rtnetlink\n");
1590
1591 netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV);
1592 register_netdevice_notifier(&rtnetlink_dev_notifier);
1593
1594 rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink, rtnl_dump_ifinfo);
1595 rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL);
1596 rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL);
1597 rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL);
1598
1599 rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all);
1600 rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all);
1601 }
1602
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