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4568120d8533f557c3211f627aac69b41ce3abc5
[deliverable/linux.git] / net / core / rtnetlink.c
1 /*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * Routing netlink socket interface: protocol independent part.
7 *
8 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
14 *
15 * Fixes:
16 * Vitaly E. Lavrov RTA_OK arithmetics was wrong.
17 */
18
19 #include <linux/errno.h>
20 #include <linux/module.h>
21 #include <linux/types.h>
22 #include <linux/socket.h>
23 #include <linux/kernel.h>
24 #include <linux/timer.h>
25 #include <linux/string.h>
26 #include <linux/sockios.h>
27 #include <linux/net.h>
28 #include <linux/fcntl.h>
29 #include <linux/mm.h>
30 #include <linux/slab.h>
31 #include <linux/interrupt.h>
32 #include <linux/capability.h>
33 #include <linux/skbuff.h>
34 #include <linux/init.h>
35 #include <linux/security.h>
36 #include <linux/mutex.h>
37 #include <linux/if_addr.h>
38 #include <linux/pci.h>
39
40 #include <asm/uaccess.h>
41 #include <asm/system.h>
42
43 #include <linux/inet.h>
44 #include <linux/netdevice.h>
45 #include <net/ip.h>
46 #include <net/protocol.h>
47 #include <net/arp.h>
48 #include <net/route.h>
49 #include <net/udp.h>
50 #include <net/sock.h>
51 #include <net/pkt_sched.h>
52 #include <net/fib_rules.h>
53 #include <net/rtnetlink.h>
54 #include <net/net_namespace.h>
55
56 struct rtnl_link {
57 rtnl_doit_func doit;
58 rtnl_dumpit_func dumpit;
59 };
60
61 static DEFINE_MUTEX(rtnl_mutex);
62
63 void rtnl_lock(void)
64 {
65 mutex_lock(&rtnl_mutex);
66 }
67 EXPORT_SYMBOL(rtnl_lock);
68
69 void __rtnl_unlock(void)
70 {
71 mutex_unlock(&rtnl_mutex);
72 }
73
74 void rtnl_unlock(void)
75 {
76 /* This fellow will unlock it for us. */
77 netdev_run_todo();
78 }
79 EXPORT_SYMBOL(rtnl_unlock);
80
81 int rtnl_trylock(void)
82 {
83 return mutex_trylock(&rtnl_mutex);
84 }
85 EXPORT_SYMBOL(rtnl_trylock);
86
87 int rtnl_is_locked(void)
88 {
89 return mutex_is_locked(&rtnl_mutex);
90 }
91 EXPORT_SYMBOL(rtnl_is_locked);
92
93 #ifdef CONFIG_PROVE_LOCKING
94 int lockdep_rtnl_is_held(void)
95 {
96 return lockdep_is_held(&rtnl_mutex);
97 }
98 EXPORT_SYMBOL(lockdep_rtnl_is_held);
99 #endif /* #ifdef CONFIG_PROVE_LOCKING */
100
101 static struct rtnl_link *rtnl_msg_handlers[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 static inline int rtnl_vfinfo_size(const struct net_device *dev)
606 {
607 if (dev->dev.parent && dev_is_pci(dev->dev.parent))
608 return dev_num_vf(dev->dev.parent) *
609 sizeof(struct ifla_vf_info);
610 else
611 return 0;
612 }
613
614 static inline size_t if_nlmsg_size(const struct net_device *dev)
615 {
616 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
617 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
618 + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */
619 + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */
620 + nla_total_size(sizeof(struct rtnl_link_ifmap))
621 + nla_total_size(sizeof(struct rtnl_link_stats))
622 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
623 + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */
624 + nla_total_size(4) /* IFLA_TXQLEN */
625 + nla_total_size(4) /* IFLA_WEIGHT */
626 + nla_total_size(4) /* IFLA_MTU */
627 + nla_total_size(4) /* IFLA_LINK */
628 + nla_total_size(4) /* IFLA_MASTER */
629 + nla_total_size(1) /* IFLA_OPERSTATE */
630 + nla_total_size(1) /* IFLA_LINKMODE */
631 + nla_total_size(4) /* IFLA_NUM_VF */
632 + nla_total_size(rtnl_vfinfo_size(dev)) /* IFLA_VFINFO */
633 + rtnl_link_get_size(dev); /* IFLA_LINKINFO */
634 }
635
636 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
637 int type, u32 pid, u32 seq, u32 change,
638 unsigned int flags)
639 {
640 struct ifinfomsg *ifm;
641 struct nlmsghdr *nlh;
642 const struct net_device_stats *stats;
643 struct nlattr *attr;
644
645 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
646 if (nlh == NULL)
647 return -EMSGSIZE;
648
649 ifm = nlmsg_data(nlh);
650 ifm->ifi_family = AF_UNSPEC;
651 ifm->__ifi_pad = 0;
652 ifm->ifi_type = dev->type;
653 ifm->ifi_index = dev->ifindex;
654 ifm->ifi_flags = dev_get_flags(dev);
655 ifm->ifi_change = change;
656
657 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
658 NLA_PUT_U32(skb, IFLA_TXQLEN, dev->tx_queue_len);
659 NLA_PUT_U8(skb, IFLA_OPERSTATE,
660 netif_running(dev) ? dev->operstate : IF_OPER_DOWN);
661 NLA_PUT_U8(skb, IFLA_LINKMODE, dev->link_mode);
662 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
663
664 if (dev->ifindex != dev->iflink)
665 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
666
667 if (dev->master)
668 NLA_PUT_U32(skb, IFLA_MASTER, dev->master->ifindex);
669
670 if (dev->qdisc)
671 NLA_PUT_STRING(skb, IFLA_QDISC, dev->qdisc->ops->id);
672
673 if (dev->ifalias)
674 NLA_PUT_STRING(skb, IFLA_IFALIAS, dev->ifalias);
675
676 if (1) {
677 struct rtnl_link_ifmap map = {
678 .mem_start = dev->mem_start,
679 .mem_end = dev->mem_end,
680 .base_addr = dev->base_addr,
681 .irq = dev->irq,
682 .dma = dev->dma,
683 .port = dev->if_port,
684 };
685 NLA_PUT(skb, IFLA_MAP, sizeof(map), &map);
686 }
687
688 if (dev->addr_len) {
689 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
690 NLA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast);
691 }
692
693 attr = nla_reserve(skb, IFLA_STATS,
694 sizeof(struct rtnl_link_stats));
695 if (attr == NULL)
696 goto nla_put_failure;
697
698 stats = dev_get_stats(dev);
699 copy_rtnl_link_stats(nla_data(attr), stats);
700
701 if (dev->netdev_ops->ndo_get_vf_config && dev->dev.parent) {
702 int i;
703 struct ifla_vf_info ivi;
704
705 NLA_PUT_U32(skb, IFLA_NUM_VF, dev_num_vf(dev->dev.parent));
706 for (i = 0; i < dev_num_vf(dev->dev.parent); i++) {
707 if (dev->netdev_ops->ndo_get_vf_config(dev, i, &ivi))
708 break;
709 NLA_PUT(skb, IFLA_VFINFO, sizeof(ivi), &ivi);
710 }
711 }
712 if (dev->rtnl_link_ops) {
713 if (rtnl_link_fill(skb, dev) < 0)
714 goto nla_put_failure;
715 }
716
717 return nlmsg_end(skb, nlh);
718
719 nla_put_failure:
720 nlmsg_cancel(skb, nlh);
721 return -EMSGSIZE;
722 }
723
724 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
725 {
726 struct net *net = sock_net(skb->sk);
727 int h, s_h;
728 int idx = 0, s_idx;
729 struct net_device *dev;
730 struct hlist_head *head;
731 struct hlist_node *node;
732
733 s_h = cb->args[0];
734 s_idx = cb->args[1];
735
736 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
737 idx = 0;
738 head = &net->dev_index_head[h];
739 hlist_for_each_entry(dev, node, head, index_hlist) {
740 if (idx < s_idx)
741 goto cont;
742 if (rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK,
743 NETLINK_CB(cb->skb).pid,
744 cb->nlh->nlmsg_seq, 0,
745 NLM_F_MULTI) <= 0)
746 goto out;
747 cont:
748 idx++;
749 }
750 }
751 out:
752 cb->args[1] = idx;
753 cb->args[0] = h;
754
755 return skb->len;
756 }
757
758 const struct nla_policy ifla_policy[IFLA_MAX+1] = {
759 [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 },
760 [IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
761 [IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
762 [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) },
763 [IFLA_MTU] = { .type = NLA_U32 },
764 [IFLA_LINK] = { .type = NLA_U32 },
765 [IFLA_TXQLEN] = { .type = NLA_U32 },
766 [IFLA_WEIGHT] = { .type = NLA_U32 },
767 [IFLA_OPERSTATE] = { .type = NLA_U8 },
768 [IFLA_LINKMODE] = { .type = NLA_U8 },
769 [IFLA_LINKINFO] = { .type = NLA_NESTED },
770 [IFLA_NET_NS_PID] = { .type = NLA_U32 },
771 [IFLA_IFALIAS] = { .type = NLA_STRING, .len = IFALIASZ-1 },
772 [IFLA_VF_MAC] = { .type = NLA_BINARY,
773 .len = sizeof(struct ifla_vf_mac) },
774 [IFLA_VF_VLAN] = { .type = NLA_BINARY,
775 .len = sizeof(struct ifla_vf_vlan) },
776 [IFLA_VF_TX_RATE] = { .type = NLA_BINARY,
777 .len = sizeof(struct ifla_vf_tx_rate) },
778 };
779 EXPORT_SYMBOL(ifla_policy);
780
781 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
782 [IFLA_INFO_KIND] = { .type = NLA_STRING },
783 [IFLA_INFO_DATA] = { .type = NLA_NESTED },
784 };
785
786 struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[])
787 {
788 struct net *net;
789 /* Examine the link attributes and figure out which
790 * network namespace we are talking about.
791 */
792 if (tb[IFLA_NET_NS_PID])
793 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID]));
794 else
795 net = get_net(src_net);
796 return net;
797 }
798 EXPORT_SYMBOL(rtnl_link_get_net);
799
800 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[])
801 {
802 if (dev) {
803 if (tb[IFLA_ADDRESS] &&
804 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
805 return -EINVAL;
806
807 if (tb[IFLA_BROADCAST] &&
808 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
809 return -EINVAL;
810 }
811
812 return 0;
813 }
814
815 static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm,
816 struct nlattr **tb, char *ifname, int modified)
817 {
818 const struct net_device_ops *ops = dev->netdev_ops;
819 int send_addr_notify = 0;
820 int err;
821
822 if (tb[IFLA_NET_NS_PID]) {
823 struct net *net = rtnl_link_get_net(dev_net(dev), tb);
824 if (IS_ERR(net)) {
825 err = PTR_ERR(net);
826 goto errout;
827 }
828 err = dev_change_net_namespace(dev, net, ifname);
829 put_net(net);
830 if (err)
831 goto errout;
832 modified = 1;
833 }
834
835 if (tb[IFLA_MAP]) {
836 struct rtnl_link_ifmap *u_map;
837 struct ifmap k_map;
838
839 if (!ops->ndo_set_config) {
840 err = -EOPNOTSUPP;
841 goto errout;
842 }
843
844 if (!netif_device_present(dev)) {
845 err = -ENODEV;
846 goto errout;
847 }
848
849 u_map = nla_data(tb[IFLA_MAP]);
850 k_map.mem_start = (unsigned long) u_map->mem_start;
851 k_map.mem_end = (unsigned long) u_map->mem_end;
852 k_map.base_addr = (unsigned short) u_map->base_addr;
853 k_map.irq = (unsigned char) u_map->irq;
854 k_map.dma = (unsigned char) u_map->dma;
855 k_map.port = (unsigned char) u_map->port;
856
857 err = ops->ndo_set_config(dev, &k_map);
858 if (err < 0)
859 goto errout;
860
861 modified = 1;
862 }
863
864 if (tb[IFLA_ADDRESS]) {
865 struct sockaddr *sa;
866 int len;
867
868 if (!ops->ndo_set_mac_address) {
869 err = -EOPNOTSUPP;
870 goto errout;
871 }
872
873 if (!netif_device_present(dev)) {
874 err = -ENODEV;
875 goto errout;
876 }
877
878 len = sizeof(sa_family_t) + dev->addr_len;
879 sa = kmalloc(len, GFP_KERNEL);
880 if (!sa) {
881 err = -ENOMEM;
882 goto errout;
883 }
884 sa->sa_family = dev->type;
885 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
886 dev->addr_len);
887 err = ops->ndo_set_mac_address(dev, sa);
888 kfree(sa);
889 if (err)
890 goto errout;
891 send_addr_notify = 1;
892 modified = 1;
893 }
894
895 if (tb[IFLA_MTU]) {
896 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
897 if (err < 0)
898 goto errout;
899 modified = 1;
900 }
901
902 /*
903 * Interface selected by interface index but interface
904 * name provided implies that a name change has been
905 * requested.
906 */
907 if (ifm->ifi_index > 0 && ifname[0]) {
908 err = dev_change_name(dev, ifname);
909 if (err < 0)
910 goto errout;
911 modified = 1;
912 }
913
914 if (tb[IFLA_IFALIAS]) {
915 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]),
916 nla_len(tb[IFLA_IFALIAS]));
917 if (err < 0)
918 goto errout;
919 modified = 1;
920 }
921
922 if (tb[IFLA_BROADCAST]) {
923 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
924 send_addr_notify = 1;
925 }
926
927 if (ifm->ifi_flags || ifm->ifi_change) {
928 err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
929 if (err < 0)
930 goto errout;
931 }
932
933 if (tb[IFLA_TXQLEN])
934 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
935
936 if (tb[IFLA_OPERSTATE])
937 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
938
939 if (tb[IFLA_LINKMODE]) {
940 write_lock_bh(&dev_base_lock);
941 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
942 write_unlock_bh(&dev_base_lock);
943 }
944
945 if (tb[IFLA_VF_MAC]) {
946 struct ifla_vf_mac *ivm;
947 ivm = nla_data(tb[IFLA_VF_MAC]);
948 err = -EOPNOTSUPP;
949 if (ops->ndo_set_vf_mac)
950 err = ops->ndo_set_vf_mac(dev, ivm->vf, ivm->mac);
951 if (err < 0)
952 goto errout;
953 modified = 1;
954 }
955
956 if (tb[IFLA_VF_VLAN]) {
957 struct ifla_vf_vlan *ivv;
958 ivv = nla_data(tb[IFLA_VF_VLAN]);
959 err = -EOPNOTSUPP;
960 if (ops->ndo_set_vf_vlan)
961 err = ops->ndo_set_vf_vlan(dev, ivv->vf,
962 ivv->vlan,
963 ivv->qos);
964 if (err < 0)
965 goto errout;
966 modified = 1;
967 }
968 err = 0;
969
970 if (tb[IFLA_VF_TX_RATE]) {
971 struct ifla_vf_tx_rate *ivt;
972 ivt = nla_data(tb[IFLA_VF_TX_RATE]);
973 err = -EOPNOTSUPP;
974 if (ops->ndo_set_vf_tx_rate)
975 err = ops->ndo_set_vf_tx_rate(dev, ivt->vf, ivt->rate);
976 if (err < 0)
977 goto errout;
978 modified = 1;
979 }
980 err = 0;
981
982 errout:
983 if (err < 0 && modified && net_ratelimit())
984 printk(KERN_WARNING "A link change request failed with "
985 "some changes comitted already. Interface %s may "
986 "have been left with an inconsistent configuration, "
987 "please check.\n", dev->name);
988
989 if (send_addr_notify)
990 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
991 return err;
992 }
993
994 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
995 {
996 struct net *net = sock_net(skb->sk);
997 struct ifinfomsg *ifm;
998 struct net_device *dev;
999 int err;
1000 struct nlattr *tb[IFLA_MAX+1];
1001 char ifname[IFNAMSIZ];
1002
1003 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1004 if (err < 0)
1005 goto errout;
1006
1007 if (tb[IFLA_IFNAME])
1008 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1009 else
1010 ifname[0] = '\0';
1011
1012 err = -EINVAL;
1013 ifm = nlmsg_data(nlh);
1014 if (ifm->ifi_index > 0)
1015 dev = __dev_get_by_index(net, ifm->ifi_index);
1016 else if (tb[IFLA_IFNAME])
1017 dev = __dev_get_by_name(net, ifname);
1018 else
1019 goto errout;
1020
1021 if (dev == NULL) {
1022 err = -ENODEV;
1023 goto errout;
1024 }
1025
1026 err = validate_linkmsg(dev, tb);
1027 if (err < 0)
1028 goto errout;
1029
1030 err = do_setlink(dev, ifm, tb, ifname, 0);
1031 errout:
1032 return err;
1033 }
1034
1035 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
1036 {
1037 struct net *net = sock_net(skb->sk);
1038 const struct rtnl_link_ops *ops;
1039 struct net_device *dev;
1040 struct ifinfomsg *ifm;
1041 char ifname[IFNAMSIZ];
1042 struct nlattr *tb[IFLA_MAX+1];
1043 int err;
1044
1045 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1046 if (err < 0)
1047 return err;
1048
1049 if (tb[IFLA_IFNAME])
1050 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1051
1052 ifm = nlmsg_data(nlh);
1053 if (ifm->ifi_index > 0)
1054 dev = __dev_get_by_index(net, ifm->ifi_index);
1055 else if (tb[IFLA_IFNAME])
1056 dev = __dev_get_by_name(net, ifname);
1057 else
1058 return -EINVAL;
1059
1060 if (!dev)
1061 return -ENODEV;
1062
1063 ops = dev->rtnl_link_ops;
1064 if (!ops)
1065 return -EOPNOTSUPP;
1066
1067 ops->dellink(dev, NULL);
1068 return 0;
1069 }
1070
1071 int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm)
1072 {
1073 unsigned int old_flags;
1074 int err;
1075
1076 old_flags = dev->flags;
1077 if (ifm && (ifm->ifi_flags || ifm->ifi_change)) {
1078 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
1079 if (err < 0)
1080 return err;
1081 }
1082
1083 dev->rtnl_link_state = RTNL_LINK_INITIALIZED;
1084 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
1085
1086 __dev_notify_flags(dev, old_flags);
1087 return 0;
1088 }
1089 EXPORT_SYMBOL(rtnl_configure_link);
1090
1091 struct net_device *rtnl_create_link(struct net *src_net, struct net *net,
1092 char *ifname, const struct rtnl_link_ops *ops, struct nlattr *tb[])
1093 {
1094 int err;
1095 struct net_device *dev;
1096 unsigned int num_queues = 1;
1097 unsigned int real_num_queues = 1;
1098
1099 if (ops->get_tx_queues) {
1100 err = ops->get_tx_queues(src_net, tb, &num_queues,
1101 &real_num_queues);
1102 if (err)
1103 goto err;
1104 }
1105 err = -ENOMEM;
1106 dev = alloc_netdev_mq(ops->priv_size, ifname, ops->setup, num_queues);
1107 if (!dev)
1108 goto err;
1109
1110 dev_net_set(dev, net);
1111 dev->rtnl_link_ops = ops;
1112 dev->rtnl_link_state = RTNL_LINK_INITIALIZING;
1113 dev->real_num_tx_queues = real_num_queues;
1114
1115 if (strchr(dev->name, '%')) {
1116 err = dev_alloc_name(dev, dev->name);
1117 if (err < 0)
1118 goto err_free;
1119 }
1120
1121 if (tb[IFLA_MTU])
1122 dev->mtu = nla_get_u32(tb[IFLA_MTU]);
1123 if (tb[IFLA_ADDRESS])
1124 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]),
1125 nla_len(tb[IFLA_ADDRESS]));
1126 if (tb[IFLA_BROADCAST])
1127 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]),
1128 nla_len(tb[IFLA_BROADCAST]));
1129 if (tb[IFLA_TXQLEN])
1130 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
1131 if (tb[IFLA_OPERSTATE])
1132 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
1133 if (tb[IFLA_LINKMODE])
1134 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
1135
1136 return dev;
1137
1138 err_free:
1139 free_netdev(dev);
1140 err:
1141 return ERR_PTR(err);
1142 }
1143 EXPORT_SYMBOL(rtnl_create_link);
1144
1145 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
1146 {
1147 struct net *net = sock_net(skb->sk);
1148 const struct rtnl_link_ops *ops;
1149 struct net_device *dev;
1150 struct ifinfomsg *ifm;
1151 char kind[MODULE_NAME_LEN];
1152 char ifname[IFNAMSIZ];
1153 struct nlattr *tb[IFLA_MAX+1];
1154 struct nlattr *linkinfo[IFLA_INFO_MAX+1];
1155 int err;
1156
1157 #ifdef CONFIG_MODULES
1158 replay:
1159 #endif
1160 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1161 if (err < 0)
1162 return err;
1163
1164 if (tb[IFLA_IFNAME])
1165 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1166 else
1167 ifname[0] = '\0';
1168
1169 ifm = nlmsg_data(nlh);
1170 if (ifm->ifi_index > 0)
1171 dev = __dev_get_by_index(net, ifm->ifi_index);
1172 else if (ifname[0])
1173 dev = __dev_get_by_name(net, ifname);
1174 else
1175 dev = NULL;
1176
1177 err = validate_linkmsg(dev, tb);
1178 if (err < 0)
1179 return err;
1180
1181 if (tb[IFLA_LINKINFO]) {
1182 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX,
1183 tb[IFLA_LINKINFO], ifla_info_policy);
1184 if (err < 0)
1185 return err;
1186 } else
1187 memset(linkinfo, 0, sizeof(linkinfo));
1188
1189 if (linkinfo[IFLA_INFO_KIND]) {
1190 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind));
1191 ops = rtnl_link_ops_get(kind);
1192 } else {
1193 kind[0] = '\0';
1194 ops = NULL;
1195 }
1196
1197 if (1) {
1198 struct nlattr *attr[ops ? ops->maxtype + 1 : 0], **data = NULL;
1199 struct net *dest_net;
1200
1201 if (ops) {
1202 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
1203 err = nla_parse_nested(attr, ops->maxtype,
1204 linkinfo[IFLA_INFO_DATA],
1205 ops->policy);
1206 if (err < 0)
1207 return err;
1208 data = attr;
1209 }
1210 if (ops->validate) {
1211 err = ops->validate(tb, data);
1212 if (err < 0)
1213 return err;
1214 }
1215 }
1216
1217 if (dev) {
1218 int modified = 0;
1219
1220 if (nlh->nlmsg_flags & NLM_F_EXCL)
1221 return -EEXIST;
1222 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1223 return -EOPNOTSUPP;
1224
1225 if (linkinfo[IFLA_INFO_DATA]) {
1226 if (!ops || ops != dev->rtnl_link_ops ||
1227 !ops->changelink)
1228 return -EOPNOTSUPP;
1229
1230 err = ops->changelink(dev, tb, data);
1231 if (err < 0)
1232 return err;
1233 modified = 1;
1234 }
1235
1236 return do_setlink(dev, ifm, tb, ifname, modified);
1237 }
1238
1239 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
1240 return -ENODEV;
1241
1242 if (ifm->ifi_index)
1243 return -EOPNOTSUPP;
1244 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO])
1245 return -EOPNOTSUPP;
1246
1247 if (!ops) {
1248 #ifdef CONFIG_MODULES
1249 if (kind[0]) {
1250 __rtnl_unlock();
1251 request_module("rtnl-link-%s", kind);
1252 rtnl_lock();
1253 ops = rtnl_link_ops_get(kind);
1254 if (ops)
1255 goto replay;
1256 }
1257 #endif
1258 return -EOPNOTSUPP;
1259 }
1260
1261 if (!ifname[0])
1262 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
1263
1264 dest_net = rtnl_link_get_net(net, tb);
1265 dev = rtnl_create_link(net, dest_net, ifname, ops, tb);
1266
1267 if (IS_ERR(dev))
1268 err = PTR_ERR(dev);
1269 else if (ops->newlink)
1270 err = ops->newlink(net, dev, tb, data);
1271 else
1272 err = register_netdevice(dev);
1273 if (err < 0 && !IS_ERR(dev)) {
1274 free_netdev(dev);
1275 goto out;
1276 }
1277
1278 err = rtnl_configure_link(dev, ifm);
1279 if (err < 0)
1280 unregister_netdevice(dev);
1281 out:
1282 put_net(dest_net);
1283 return err;
1284 }
1285 }
1286
1287 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
1288 {
1289 struct net *net = sock_net(skb->sk);
1290 struct ifinfomsg *ifm;
1291 char ifname[IFNAMSIZ];
1292 struct nlattr *tb[IFLA_MAX+1];
1293 struct net_device *dev = NULL;
1294 struct sk_buff *nskb;
1295 int err;
1296
1297 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1298 if (err < 0)
1299 return err;
1300
1301 if (tb[IFLA_IFNAME])
1302 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1303
1304 ifm = nlmsg_data(nlh);
1305 if (ifm->ifi_index > 0)
1306 dev = __dev_get_by_index(net, ifm->ifi_index);
1307 else if (tb[IFLA_IFNAME])
1308 dev = __dev_get_by_name(net, ifname);
1309 else
1310 return -EINVAL;
1311
1312 if (dev == NULL)
1313 return -ENODEV;
1314
1315 nskb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL);
1316 if (nskb == NULL)
1317 return -ENOBUFS;
1318
1319 err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).pid,
1320 nlh->nlmsg_seq, 0, 0);
1321 if (err < 0) {
1322 /* -EMSGSIZE implies BUG in if_nlmsg_size */
1323 WARN_ON(err == -EMSGSIZE);
1324 kfree_skb(nskb);
1325 } else
1326 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).pid);
1327
1328 return err;
1329 }
1330
1331 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
1332 {
1333 int idx;
1334 int s_idx = cb->family;
1335
1336 if (s_idx == 0)
1337 s_idx = 1;
1338 for (idx = 1; idx < NPROTO; idx++) {
1339 int type = cb->nlh->nlmsg_type-RTM_BASE;
1340 if (idx < s_idx || idx == PF_PACKET)
1341 continue;
1342 if (rtnl_msg_handlers[idx] == NULL ||
1343 rtnl_msg_handlers[idx][type].dumpit == NULL)
1344 continue;
1345 if (idx > s_idx)
1346 memset(&cb->args[0], 0, sizeof(cb->args));
1347 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb))
1348 break;
1349 }
1350 cb->family = idx;
1351
1352 return skb->len;
1353 }
1354
1355 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change)
1356 {
1357 struct net *net = dev_net(dev);
1358 struct sk_buff *skb;
1359 int err = -ENOBUFS;
1360
1361 skb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL);
1362 if (skb == NULL)
1363 goto errout;
1364
1365 err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0);
1366 if (err < 0) {
1367 /* -EMSGSIZE implies BUG in if_nlmsg_size() */
1368 WARN_ON(err == -EMSGSIZE);
1369 kfree_skb(skb);
1370 goto errout;
1371 }
1372 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_KERNEL);
1373 return;
1374 errout:
1375 if (err < 0)
1376 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
1377 }
1378
1379 /* Protected by RTNL sempahore. */
1380 static struct rtattr **rta_buf;
1381 static int rtattr_max;
1382
1383 /* Process one rtnetlink message. */
1384
1385 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
1386 {
1387 struct net *net = sock_net(skb->sk);
1388 rtnl_doit_func doit;
1389 int sz_idx, kind;
1390 int min_len;
1391 int family;
1392 int type;
1393 int err;
1394
1395 type = nlh->nlmsg_type;
1396 if (type > RTM_MAX)
1397 return -EOPNOTSUPP;
1398
1399 type -= RTM_BASE;
1400
1401 /* All the messages must have at least 1 byte length */
1402 if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg)))
1403 return 0;
1404
1405 family = ((struct rtgenmsg *)NLMSG_DATA(nlh))->rtgen_family;
1406 if (family >= NPROTO)
1407 return -EAFNOSUPPORT;
1408
1409 sz_idx = type>>2;
1410 kind = type&3;
1411
1412 if (kind != 2 && security_netlink_recv(skb, CAP_NET_ADMIN))
1413 return -EPERM;
1414
1415 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
1416 struct sock *rtnl;
1417 rtnl_dumpit_func dumpit;
1418
1419 dumpit = rtnl_get_dumpit(family, type);
1420 if (dumpit == NULL)
1421 return -EOPNOTSUPP;
1422
1423 __rtnl_unlock();
1424 rtnl = net->rtnl;
1425 err = netlink_dump_start(rtnl, skb, nlh, dumpit, NULL);
1426 rtnl_lock();
1427 return err;
1428 }
1429
1430 memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *)));
1431
1432 min_len = rtm_min[sz_idx];
1433 if (nlh->nlmsg_len < min_len)
1434 return -EINVAL;
1435
1436 if (nlh->nlmsg_len > min_len) {
1437 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
1438 struct rtattr *attr = (void *)nlh + NLMSG_ALIGN(min_len);
1439
1440 while (RTA_OK(attr, attrlen)) {
1441 unsigned flavor = attr->rta_type;
1442 if (flavor) {
1443 if (flavor > rta_max[sz_idx])
1444 return -EINVAL;
1445 rta_buf[flavor-1] = attr;
1446 }
1447 attr = RTA_NEXT(attr, attrlen);
1448 }
1449 }
1450
1451 doit = rtnl_get_doit(family, type);
1452 if (doit == NULL)
1453 return -EOPNOTSUPP;
1454
1455 return doit(skb, nlh, (void *)&rta_buf[0]);
1456 }
1457
1458 static void rtnetlink_rcv(struct sk_buff *skb)
1459 {
1460 rtnl_lock();
1461 netlink_rcv_skb(skb, &rtnetlink_rcv_msg);
1462 rtnl_unlock();
1463 }
1464
1465 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
1466 {
1467 struct net_device *dev = ptr;
1468
1469 switch (event) {
1470 case NETDEV_UP:
1471 case NETDEV_DOWN:
1472 case NETDEV_PRE_UP:
1473 case NETDEV_POST_INIT:
1474 case NETDEV_REGISTER:
1475 case NETDEV_CHANGE:
1476 case NETDEV_GOING_DOWN:
1477 case NETDEV_UNREGISTER:
1478 case NETDEV_UNREGISTER_BATCH:
1479 break;
1480 default:
1481 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
1482 break;
1483 }
1484 return NOTIFY_DONE;
1485 }
1486
1487 static struct notifier_block rtnetlink_dev_notifier = {
1488 .notifier_call = rtnetlink_event,
1489 };
1490
1491
1492 static int __net_init rtnetlink_net_init(struct net *net)
1493 {
1494 struct sock *sk;
1495 sk = netlink_kernel_create(net, NETLINK_ROUTE, RTNLGRP_MAX,
1496 rtnetlink_rcv, &rtnl_mutex, THIS_MODULE);
1497 if (!sk)
1498 return -ENOMEM;
1499 net->rtnl = sk;
1500 return 0;
1501 }
1502
1503 static void __net_exit rtnetlink_net_exit(struct net *net)
1504 {
1505 netlink_kernel_release(net->rtnl);
1506 net->rtnl = NULL;
1507 }
1508
1509 static struct pernet_operations rtnetlink_net_ops = {
1510 .init = rtnetlink_net_init,
1511 .exit = rtnetlink_net_exit,
1512 };
1513
1514 void __init rtnetlink_init(void)
1515 {
1516 int i;
1517
1518 rtattr_max = 0;
1519 for (i = 0; i < ARRAY_SIZE(rta_max); i++)
1520 if (rta_max[i] > rtattr_max)
1521 rtattr_max = rta_max[i];
1522 rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL);
1523 if (!rta_buf)
1524 panic("rtnetlink_init: cannot allocate rta_buf\n");
1525
1526 if (register_pernet_subsys(&rtnetlink_net_ops))
1527 panic("rtnetlink_init: cannot initialize rtnetlink\n");
1528
1529 netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV);
1530 register_netdevice_notifier(&rtnetlink_dev_notifier);
1531
1532 rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink, rtnl_dump_ifinfo);
1533 rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL);
1534 rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL);
1535 rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL);
1536
1537 rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all);
1538 rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all);
1539 }
1540
Linux kernel - Deliverables
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