?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
inotify: fix race
[linux-2.6.22.y-op.git] / net / core / rtnetlink.c
blob02e8bf084277963300be7cd68f7a8b6de67cab59
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
39 #include <asm/uaccess.h>
40 #include <asm/system.h>
41 #include <asm/string.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
55 struct rtnl_link
56 {
57 rtnl_doit_func doit;
58 rtnl_dumpit_func dumpit;
59 };
60
61 static DEFINE_MUTEX(rtnl_mutex);
62 static struct sock *rtnl;
63
64 void rtnl_lock(void)
65 {
66 mutex_lock(&rtnl_mutex);
67 }
68
69 void __rtnl_unlock(void)
70 {
71 mutex_unlock(&rtnl_mutex);
72 }
73
74 void rtnl_unlock(void)
75 {
76 mutex_unlock(&rtnl_mutex);
77 if (rtnl && rtnl->sk_receive_queue.qlen)
78 rtnl->sk_data_ready(rtnl, 0);
79 netdev_run_todo();
80 }
81
82 int rtnl_trylock(void)
83 {
84 return mutex_trylock(&rtnl_mutex);
85 }
86
87 int rtattr_parse(struct rtattr *tb[], int maxattr, struct rtattr *rta, int len)
88 {
89 memset(tb, 0, sizeof(struct rtattr*)*maxattr);
90
91 while (RTA_OK(rta, len)) {
92 unsigned flavor = rta->rta_type;
93 if (flavor && flavor <= maxattr)
94 tb[flavor-1] = rta;
95 rta = RTA_NEXT(rta, len);
96 }
97 return 0;
98 }
99
100 static struct rtnl_link *rtnl_msg_handlers[NPROTO];
101
102 static inline int rtm_msgindex(int msgtype)
103 {
104 int msgindex = msgtype - RTM_BASE;
105
106 /*
107 * msgindex < 0 implies someone tried to register a netlink
108 * control code. msgindex >= RTM_NR_MSGTYPES may indicate that
109 * the message type has not been added to linux/rtnetlink.h
110 */
111 BUG_ON(msgindex < 0 || msgindex >= RTM_NR_MSGTYPES);
112
113 return msgindex;
114 }
115
116 static rtnl_doit_func rtnl_get_doit(int protocol, int msgindex)
117 {
118 struct rtnl_link *tab;
119
120 tab = rtnl_msg_handlers[protocol];
121 if (tab == NULL || tab[msgindex].doit == NULL)
122 tab = rtnl_msg_handlers[PF_UNSPEC];
123
124 return tab ? tab[msgindex].doit : NULL;
125 }
126
127 static rtnl_dumpit_func rtnl_get_dumpit(int protocol, int msgindex)
128 {
129 struct rtnl_link *tab;
130
131 tab = rtnl_msg_handlers[protocol];
132 if (tab == NULL || tab[msgindex].dumpit == NULL)
133 tab = rtnl_msg_handlers[PF_UNSPEC];
134
135 return tab ? tab[msgindex].dumpit : NULL;
136 }
137
138 /**
139 * __rtnl_register - Register a rtnetlink message type
140 * @protocol: Protocol family or PF_UNSPEC
141 * @msgtype: rtnetlink message type
142 * @doit: Function pointer called for each request message
143 * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message
144 *
145 * Registers the specified function pointers (at least one of them has
146 * to be non-NULL) to be called whenever a request message for the
147 * specified protocol family and message type is received.
148 *
149 * The special protocol family PF_UNSPEC may be used to define fallback
150 * function pointers for the case when no entry for the specific protocol
151 * family exists.
152 *
153 * Returns 0 on success or a negative error code.
154 */
155 int __rtnl_register(int protocol, int msgtype,
156 rtnl_doit_func doit, rtnl_dumpit_func dumpit)
157 {
158 struct rtnl_link *tab;
159 int msgindex;
160
161 BUG_ON(protocol < 0 || protocol >= NPROTO);
162 msgindex = rtm_msgindex(msgtype);
163
164 tab = rtnl_msg_handlers[protocol];
165 if (tab == NULL) {
166 tab = kcalloc(RTM_NR_MSGTYPES, sizeof(*tab), GFP_KERNEL);
167 if (tab == NULL)
168 return -ENOBUFS;
169
170 rtnl_msg_handlers[protocol] = tab;
171 }
172
173 if (doit)
174 tab[msgindex].doit = doit;
175
176 if (dumpit)
177 tab[msgindex].dumpit = dumpit;
178
179 return 0;
180 }
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
202 EXPORT_SYMBOL_GPL(rtnl_register);
203
204 /**
205 * rtnl_unregister - Unregister a rtnetlink message type
206 * @protocol: Protocol family or PF_UNSPEC
207 * @msgtype: rtnetlink message type
208 *
209 * Returns 0 on success or a negative error code.
210 */
211 int rtnl_unregister(int protocol, int msgtype)
212 {
213 int msgindex;
214
215 BUG_ON(protocol < 0 || protocol >= NPROTO);
216 msgindex = rtm_msgindex(msgtype);
217
218 if (rtnl_msg_handlers[protocol] == NULL)
219 return -ENOENT;
220
221 rtnl_msg_handlers[protocol][msgindex].doit = NULL;
222 rtnl_msg_handlers[protocol][msgindex].dumpit = NULL;
223
224 return 0;
225 }
226
227 EXPORT_SYMBOL_GPL(rtnl_unregister);
228
229 /**
230 * rtnl_unregister_all - Unregister all rtnetlink message type of a protocol
231 * @protocol : Protocol family or PF_UNSPEC
232 *
233 * Identical to calling rtnl_unregster() for all registered message types
234 * of a certain protocol family.
235 */
236 void rtnl_unregister_all(int protocol)
237 {
238 BUG_ON(protocol < 0 || protocol >= NPROTO);
239
240 kfree(rtnl_msg_handlers[protocol]);
241 rtnl_msg_handlers[protocol] = NULL;
242 }
243
244 EXPORT_SYMBOL_GPL(rtnl_unregister_all);
245
246 static const int rtm_min[RTM_NR_FAMILIES] =
247 {
248 [RTM_FAM(RTM_NEWLINK)] = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
249 [RTM_FAM(RTM_NEWADDR)] = NLMSG_LENGTH(sizeof(struct ifaddrmsg)),
250 [RTM_FAM(RTM_NEWROUTE)] = NLMSG_LENGTH(sizeof(struct rtmsg)),
251 [RTM_FAM(RTM_NEWRULE)] = NLMSG_LENGTH(sizeof(struct fib_rule_hdr)),
252 [RTM_FAM(RTM_NEWQDISC)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
253 [RTM_FAM(RTM_NEWTCLASS)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
254 [RTM_FAM(RTM_NEWTFILTER)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
255 [RTM_FAM(RTM_NEWACTION)] = NLMSG_LENGTH(sizeof(struct tcamsg)),
256 [RTM_FAM(RTM_GETMULTICAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
257 [RTM_FAM(RTM_GETANYCAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
258 };
259
260 static const int rta_max[RTM_NR_FAMILIES] =
261 {
262 [RTM_FAM(RTM_NEWLINK)] = IFLA_MAX,
263 [RTM_FAM(RTM_NEWADDR)] = IFA_MAX,
264 [RTM_FAM(RTM_NEWROUTE)] = RTA_MAX,
265 [RTM_FAM(RTM_NEWRULE)] = FRA_MAX,
266 [RTM_FAM(RTM_NEWQDISC)] = TCA_MAX,
267 [RTM_FAM(RTM_NEWTCLASS)] = TCA_MAX,
268 [RTM_FAM(RTM_NEWTFILTER)] = TCA_MAX,
269 [RTM_FAM(RTM_NEWACTION)] = TCAA_MAX,
270 };
271
272 void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const void *data)
273 {
274 struct rtattr *rta;
275 int size = RTA_LENGTH(attrlen);
276
277 rta = (struct rtattr*)skb_put(skb, RTA_ALIGN(size));
278 rta->rta_type = attrtype;
279 rta->rta_len = size;
280 memcpy(RTA_DATA(rta), data, attrlen);
281 memset(RTA_DATA(rta) + attrlen, 0, RTA_ALIGN(size) - size);
282 }
283
284 size_t rtattr_strlcpy(char *dest, const struct rtattr *rta, size_t size)
285 {
286 size_t ret = RTA_PAYLOAD(rta);
287 char *src = RTA_DATA(rta);
288
289 if (ret > 0 && src[ret - 1] == '\0')
290 ret--;
291 if (size > 0) {
292 size_t len = (ret >= size) ? size - 1 : ret;
293 memset(dest, 0, size);
294 memcpy(dest, src, len);
295 }
296 return ret;
297 }
298
299 int rtnetlink_send(struct sk_buff *skb, u32 pid, unsigned group, int echo)
300 {
301 int err = 0;
302
303 NETLINK_CB(skb).dst_group = group;
304 if (echo)
305 atomic_inc(&skb->users);
306 netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL);
307 if (echo)
308 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
309 return err;
310 }
311
312 int rtnl_unicast(struct sk_buff *skb, u32 pid)
313 {
314 return nlmsg_unicast(rtnl, skb, pid);
315 }
316
317 int rtnl_notify(struct sk_buff *skb, u32 pid, u32 group,
318 struct nlmsghdr *nlh, gfp_t flags)
319 {
320 int report = 0;
321
322 if (nlh)
323 report = nlmsg_report(nlh);
324
325 return nlmsg_notify(rtnl, skb, pid, group, report, flags);
326 }
327
328 void rtnl_set_sk_err(u32 group, int error)
329 {
330 netlink_set_err(rtnl, 0, group, error);
331 }
332
333 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics)
334 {
335 struct nlattr *mx;
336 int i, valid = 0;
337
338 mx = nla_nest_start(skb, RTA_METRICS);
339 if (mx == NULL)
340 return -ENOBUFS;
341
342 for (i = 0; i < RTAX_MAX; i++) {
343 if (metrics[i]) {
344 valid++;
345 NLA_PUT_U32(skb, i+1, metrics[i]);
346 }
347 }
348
349 if (!valid) {
350 nla_nest_cancel(skb, mx);
351 return 0;
352 }
353
354 return nla_nest_end(skb, mx);
355
356 nla_put_failure:
357 return nla_nest_cancel(skb, mx);
358 }
359
360 int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id,
361 u32 ts, u32 tsage, long expires, u32 error)
362 {
363 struct rta_cacheinfo ci = {
364 .rta_lastuse = jiffies_to_clock_t(jiffies - dst->lastuse),
365 .rta_used = dst->__use,
366 .rta_clntref = atomic_read(&(dst->__refcnt)),
367 .rta_error = error,
368 .rta_id = id,
369 .rta_ts = ts,
370 .rta_tsage = tsage,
371 };
372
373 if (expires)
374 ci.rta_expires = jiffies_to_clock_t(expires);
375
376 return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci);
377 }
378
379 EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo);
380
381 static void set_operstate(struct net_device *dev, unsigned char transition)
382 {
383 unsigned char operstate = dev->operstate;
384
385 switch(transition) {
386 case IF_OPER_UP:
387 if ((operstate == IF_OPER_DORMANT ||
388 operstate == IF_OPER_UNKNOWN) &&
389 !netif_dormant(dev))
390 operstate = IF_OPER_UP;
391 break;
392
393 case IF_OPER_DORMANT:
394 if (operstate == IF_OPER_UP ||
395 operstate == IF_OPER_UNKNOWN)
396 operstate = IF_OPER_DORMANT;
397 break;
398 }
399
400 if (dev->operstate != operstate) {
401 write_lock_bh(&dev_base_lock);
402 dev->operstate = operstate;
403 write_unlock_bh(&dev_base_lock);
404 netdev_state_change(dev);
405 }
406 }
407
408 static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
409 struct net_device_stats *b)
410 {
411 a->rx_packets = b->rx_packets;
412 a->tx_packets = b->tx_packets;
413 a->rx_bytes = b->rx_bytes;
414 a->tx_bytes = b->tx_bytes;
415 a->rx_errors = b->rx_errors;
416 a->tx_errors = b->tx_errors;
417 a->rx_dropped = b->rx_dropped;
418 a->tx_dropped = b->tx_dropped;
419
420 a->multicast = b->multicast;
421 a->collisions = b->collisions;
422
423 a->rx_length_errors = b->rx_length_errors;
424 a->rx_over_errors = b->rx_over_errors;
425 a->rx_crc_errors = b->rx_crc_errors;
426 a->rx_frame_errors = b->rx_frame_errors;
427 a->rx_fifo_errors = b->rx_fifo_errors;
428 a->rx_missed_errors = b->rx_missed_errors;
429
430 a->tx_aborted_errors = b->tx_aborted_errors;
431 a->tx_carrier_errors = b->tx_carrier_errors;
432 a->tx_fifo_errors = b->tx_fifo_errors;
433 a->tx_heartbeat_errors = b->tx_heartbeat_errors;
434 a->tx_window_errors = b->tx_window_errors;
435
436 a->rx_compressed = b->rx_compressed;
437 a->tx_compressed = b->tx_compressed;
438 };
439
440 static inline size_t if_nlmsg_size(void)
441 {
442 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
443 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
444 + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */
445 + nla_total_size(sizeof(struct rtnl_link_ifmap))
446 + nla_total_size(sizeof(struct rtnl_link_stats))
447 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
448 + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */
449 + nla_total_size(4) /* IFLA_TXQLEN */
450 + nla_total_size(4) /* IFLA_WEIGHT */
451 + nla_total_size(4) /* IFLA_MTU */
452 + nla_total_size(4) /* IFLA_LINK */
453 + nla_total_size(4) /* IFLA_MASTER */
454 + nla_total_size(1) /* IFLA_OPERSTATE */
455 + nla_total_size(1); /* IFLA_LINKMODE */
456 }
457
458 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
459 int type, u32 pid, u32 seq, u32 change,
460 unsigned int flags)
461 {
462 struct ifinfomsg *ifm;
463 struct nlmsghdr *nlh;
464
465 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
466 if (nlh == NULL)
467 return -EMSGSIZE;
468
469 ifm = nlmsg_data(nlh);
470 ifm->ifi_family = AF_UNSPEC;
471 ifm->__ifi_pad = 0;
472 ifm->ifi_type = dev->type;
473 ifm->ifi_index = dev->ifindex;
474 ifm->ifi_flags = dev_get_flags(dev);
475 ifm->ifi_change = change;
476
477 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
478 NLA_PUT_U32(skb, IFLA_TXQLEN, dev->tx_queue_len);
479 NLA_PUT_U32(skb, IFLA_WEIGHT, dev->weight);
480 NLA_PUT_U8(skb, IFLA_OPERSTATE,
481 netif_running(dev) ? dev->operstate : IF_OPER_DOWN);
482 NLA_PUT_U8(skb, IFLA_LINKMODE, dev->link_mode);
483 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
484
485 if (dev->ifindex != dev->iflink)
486 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
487
488 if (dev->master)
489 NLA_PUT_U32(skb, IFLA_MASTER, dev->master->ifindex);
490
491 if (dev->qdisc_sleeping)
492 NLA_PUT_STRING(skb, IFLA_QDISC, dev->qdisc_sleeping->ops->id);
493
494 if (1) {
495 struct rtnl_link_ifmap map = {
496 .mem_start = dev->mem_start,
497 .mem_end = dev->mem_end,
498 .base_addr = dev->base_addr,
499 .irq = dev->irq,
500 .dma = dev->dma,
501 .port = dev->if_port,
502 };
503 NLA_PUT(skb, IFLA_MAP, sizeof(map), &map);
504 }
505
506 if (dev->addr_len) {
507 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
508 NLA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast);
509 }
510
511 if (dev->get_stats) {
512 struct net_device_stats *stats = dev->get_stats(dev);
513 if (stats) {
514 struct nlattr *attr;
515
516 attr = nla_reserve(skb, IFLA_STATS,
517 sizeof(struct rtnl_link_stats));
518 if (attr == NULL)
519 goto nla_put_failure;
520
521 copy_rtnl_link_stats(nla_data(attr), stats);
522 }
523 }
524
525 return nlmsg_end(skb, nlh);
526
527 nla_put_failure:
528 nlmsg_cancel(skb, nlh);
529 return -EMSGSIZE;
530 }
531
532 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
533 {
534 int idx;
535 int s_idx = cb->args[0];
536 struct net_device *dev;
537
538 idx = 0;
539 for_each_netdev(dev) {
540 if (idx < s_idx)
541 goto cont;
542 if (rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK,
543 NETLINK_CB(cb->skb).pid,
544 cb->nlh->nlmsg_seq, 0, NLM_F_MULTI) <= 0)
545 break;
546 cont:
547 idx++;
548 }
549 cb->args[0] = idx;
550
551 return skb->len;
552 }
553
554 static const struct nla_policy ifla_policy[IFLA_MAX+1] = {
555 [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 },
556 [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) },
557 [IFLA_MTU] = { .type = NLA_U32 },
558 [IFLA_TXQLEN] = { .type = NLA_U32 },
559 [IFLA_WEIGHT] = { .type = NLA_U32 },
560 [IFLA_OPERSTATE] = { .type = NLA_U8 },
561 [IFLA_LINKMODE] = { .type = NLA_U8 },
562 };
563
564 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
565 {
566 struct ifinfomsg *ifm;
567 struct net_device *dev;
568 int err, send_addr_notify = 0, modified = 0;
569 struct nlattr *tb[IFLA_MAX+1];
570 char ifname[IFNAMSIZ];
571
572 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
573 if (err < 0)
574 goto errout;
575
576 if (tb[IFLA_IFNAME])
577 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
578 else
579 ifname[0] = '\0';
580
581 err = -EINVAL;
582 ifm = nlmsg_data(nlh);
583 if (ifm->ifi_index > 0)
584 dev = dev_get_by_index(ifm->ifi_index);
585 else if (tb[IFLA_IFNAME])
586 dev = dev_get_by_name(ifname);
587 else
588 goto errout;
589
590 if (dev == NULL) {
591 err = -ENODEV;
592 goto errout;
593 }
594
595 if (tb[IFLA_ADDRESS] &&
596 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
597 goto errout_dev;
598
599 if (tb[IFLA_BROADCAST] &&
600 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
601 goto errout_dev;
602
603 if (tb[IFLA_MAP]) {
604 struct rtnl_link_ifmap *u_map;
605 struct ifmap k_map;
606
607 if (!dev->set_config) {
608 err = -EOPNOTSUPP;
609 goto errout_dev;
610 }
611
612 if (!netif_device_present(dev)) {
613 err = -ENODEV;
614 goto errout_dev;
615 }
616
617 u_map = nla_data(tb[IFLA_MAP]);
618 k_map.mem_start = (unsigned long) u_map->mem_start;
619 k_map.mem_end = (unsigned long) u_map->mem_end;
620 k_map.base_addr = (unsigned short) u_map->base_addr;
621 k_map.irq = (unsigned char) u_map->irq;
622 k_map.dma = (unsigned char) u_map->dma;
623 k_map.port = (unsigned char) u_map->port;
624
625 err = dev->set_config(dev, &k_map);
626 if (err < 0)
627 goto errout_dev;
628
629 modified = 1;
630 }
631
632 if (tb[IFLA_ADDRESS]) {
633 struct sockaddr *sa;
634 int len;
635
636 if (!dev->set_mac_address) {
637 err = -EOPNOTSUPP;
638 goto errout_dev;
639 }
640
641 if (!netif_device_present(dev)) {
642 err = -ENODEV;
643 goto errout_dev;
644 }
645
646 len = sizeof(sa_family_t) + dev->addr_len;
647 sa = kmalloc(len, GFP_KERNEL);
648 if (!sa) {
649 err = -ENOMEM;
650 goto errout_dev;
651 }
652 sa->sa_family = dev->type;
653 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
654 dev->addr_len);
655 err = dev->set_mac_address(dev, sa);
656 kfree(sa);
657 if (err)
658 goto errout_dev;
659 send_addr_notify = 1;
660 modified = 1;
661 }
662
663 if (tb[IFLA_MTU]) {
664 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
665 if (err < 0)
666 goto errout_dev;
667 modified = 1;
668 }
669
670 /*
671 * Interface selected by interface index but interface
672 * name provided implies that a name change has been
673 * requested.
674 */
675 if (ifm->ifi_index > 0 && ifname[0]) {
676 err = dev_change_name(dev, ifname);
677 if (err < 0)
678 goto errout_dev;
679 modified = 1;
680 }
681
682 if (tb[IFLA_BROADCAST]) {
683 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
684 send_addr_notify = 1;
685 }
686
687
688 if (ifm->ifi_flags || ifm->ifi_change) {
689 unsigned int flags = ifm->ifi_flags;
690
691 /* bugwards compatibility: ifi_change == 0 is treated as ~0 */
692 if (ifm->ifi_change)
693 flags = (flags & ifm->ifi_change) |
694 (dev->flags & ~ifm->ifi_change);
695 dev_change_flags(dev, flags);
696 }
697
698 if (tb[IFLA_TXQLEN])
699 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
700
701 if (tb[IFLA_WEIGHT])
702 dev->weight = nla_get_u32(tb[IFLA_WEIGHT]);
703
704 if (tb[IFLA_OPERSTATE])
705 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
706
707 if (tb[IFLA_LINKMODE]) {
708 write_lock_bh(&dev_base_lock);
709 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
710 write_unlock_bh(&dev_base_lock);
711 }
712
713 err = 0;
714
715 errout_dev:
716 if (err < 0 && modified && net_ratelimit())
717 printk(KERN_WARNING "A link change request failed with "
718 "some changes comitted already. Interface %s may "
719 "have been left with an inconsistent configuration, "
720 "please check.\n", dev->name);
721
722 if (send_addr_notify)
723 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
724
725 dev_put(dev);
726 errout:
727 return err;
728 }
729
730 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
731 {
732 struct ifinfomsg *ifm;
733 struct nlattr *tb[IFLA_MAX+1];
734 struct net_device *dev = NULL;
735 struct sk_buff *nskb;
736 int err;
737
738 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
739 if (err < 0)
740 return err;
741
742 ifm = nlmsg_data(nlh);
743 if (ifm->ifi_index > 0) {
744 dev = dev_get_by_index(ifm->ifi_index);
745 if (dev == NULL)
746 return -ENODEV;
747 } else
748 return -EINVAL;
749
750 nskb = nlmsg_new(if_nlmsg_size(), GFP_KERNEL);
751 if (nskb == NULL) {
752 err = -ENOBUFS;
753 goto errout;
754 }
755
756 err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).pid,
757 nlh->nlmsg_seq, 0, 0);
758 if (err < 0) {
759 /* -EMSGSIZE implies BUG in if_nlmsg_size */
760 WARN_ON(err == -EMSGSIZE);
761 kfree_skb(nskb);
762 goto errout;
763 }
764 err = rtnl_unicast(nskb, NETLINK_CB(skb).pid);
765 errout:
766 dev_put(dev);
767
768 return err;
769 }
770
771 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
772 {
773 int idx;
774 int s_idx = cb->family;
775
776 if (s_idx == 0)
777 s_idx = 1;
778 for (idx=1; idx<NPROTO; idx++) {
779 int type = cb->nlh->nlmsg_type-RTM_BASE;
780 if (idx < s_idx || idx == PF_PACKET)
781 continue;
782 if (rtnl_msg_handlers[idx] == NULL ||
783 rtnl_msg_handlers[idx][type].dumpit == NULL)
784 continue;
785 if (idx > s_idx)
786 memset(&cb->args[0], 0, sizeof(cb->args));
787 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb))
788 break;
789 }
790 cb->family = idx;
791
792 return skb->len;
793 }
794
795 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change)
796 {
797 struct sk_buff *skb;
798 int err = -ENOBUFS;
799
800 skb = nlmsg_new(if_nlmsg_size(), GFP_KERNEL);
801 if (skb == NULL)
802 goto errout;
803
804 err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0);
805 if (err < 0) {
806 /* -EMSGSIZE implies BUG in if_nlmsg_size() */
807 WARN_ON(err == -EMSGSIZE);
808 kfree_skb(skb);
809 goto errout;
810 }
811 err = rtnl_notify(skb, 0, RTNLGRP_LINK, NULL, GFP_KERNEL);
812 errout:
813 if (err < 0)
814 rtnl_set_sk_err(RTNLGRP_LINK, err);
815 }
816
817 /* Protected by RTNL sempahore. */
818 static struct rtattr **rta_buf;
819 static int rtattr_max;
820
821 /* Process one rtnetlink message. */
822
823 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
824 {
825 rtnl_doit_func doit;
826 int sz_idx, kind;
827 int min_len;
828 int family;
829 int type;
830 int err;
831
832 type = nlh->nlmsg_type;
833 if (type > RTM_MAX)
834 return -EOPNOTSUPP;
835
836 type -= RTM_BASE;
837
838 /* All the messages must have at least 1 byte length */
839 if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg)))
840 return 0;
841
842 family = ((struct rtgenmsg*)NLMSG_DATA(nlh))->rtgen_family;
843 if (family >= NPROTO)
844 return -EAFNOSUPPORT;
845
846 sz_idx = type>>2;
847 kind = type&3;
848
849 if (kind != 2 && security_netlink_recv(skb, CAP_NET_ADMIN))
850 return -EPERM;
851
852 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
853 rtnl_dumpit_func dumpit;
854
855 dumpit = rtnl_get_dumpit(family, type);
856 if (dumpit == NULL)
857 return -EOPNOTSUPP;
858
859 __rtnl_unlock();
860 err = netlink_dump_start(rtnl, skb, nlh, dumpit, NULL);
861 rtnl_lock();
862 return err;
863 }
864
865 memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *)));
866
867 min_len = rtm_min[sz_idx];
868 if (nlh->nlmsg_len < min_len)
869 return -EINVAL;
870
871 if (nlh->nlmsg_len > min_len) {
872 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
873 struct rtattr *attr = (void*)nlh + NLMSG_ALIGN(min_len);
874
875 while (RTA_OK(attr, attrlen)) {
876 unsigned flavor = attr->rta_type;
877 if (flavor) {
878 if (flavor > rta_max[sz_idx])
879 return -EINVAL;
880 rta_buf[flavor-1] = attr;
881 }
882 attr = RTA_NEXT(attr, attrlen);
883 }
884 }
885
886 doit = rtnl_get_doit(family, type);
887 if (doit == NULL)
888 return -EOPNOTSUPP;
889
890 return doit(skb, nlh, (void *)&rta_buf[0]);
891 }
892
893 static void rtnetlink_rcv(struct sock *sk, int len)
894 {
895 unsigned int qlen = 0;
896
897 do {
898 mutex_lock(&rtnl_mutex);
899 netlink_run_queue(sk, &qlen, &rtnetlink_rcv_msg);
900 mutex_unlock(&rtnl_mutex);
901
902 netdev_run_todo();
903 } while (qlen);
904 }
905
906 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
907 {
908 struct net_device *dev = ptr;
909 switch (event) {
910 case NETDEV_UNREGISTER:
911 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);
912 break;
913 case NETDEV_REGISTER:
914 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
915 break;
916 case NETDEV_UP:
917 case NETDEV_DOWN:
918 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
919 break;
920 case NETDEV_CHANGE:
921 case NETDEV_GOING_DOWN:
922 break;
923 default:
924 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
925 break;
926 }
927 return NOTIFY_DONE;
928 }
929
930 static struct notifier_block rtnetlink_dev_notifier = {
931 .notifier_call = rtnetlink_event,
932 };
933
934 void __init rtnetlink_init(void)
935 {
936 int i;
937
938 rtattr_max = 0;
939 for (i = 0; i < ARRAY_SIZE(rta_max); i++)
940 if (rta_max[i] > rtattr_max)
941 rtattr_max = rta_max[i];
942 rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL);
943 if (!rta_buf)
944 panic("rtnetlink_init: cannot allocate rta_buf\n");
945
946 rtnl = netlink_kernel_create(NETLINK_ROUTE, RTNLGRP_MAX, rtnetlink_rcv,
947 &rtnl_mutex, THIS_MODULE);
948 if (rtnl == NULL)
949 panic("rtnetlink_init: cannot initialize rtnetlink\n");
950 netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV);
951 register_netdevice_notifier(&rtnetlink_dev_notifier);
952
953 rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink, rtnl_dump_ifinfo);
954 rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL);
955
956 rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all);
957 rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all);
958 }
959
960 EXPORT_SYMBOL(__rta_fill);
961 EXPORT_SYMBOL(rtattr_strlcpy);
962 EXPORT_SYMBOL(rtattr_parse);
963 EXPORT_SYMBOL(rtnetlink_put_metrics);
964 EXPORT_SYMBOL(rtnl_lock);
965 EXPORT_SYMBOL(rtnl_trylock);
966 EXPORT_SYMBOL(rtnl_unlock);
967 EXPORT_SYMBOL(rtnl_unicast);
968 EXPORT_SYMBOL(rtnl_notify);
969 EXPORT_SYMBOL(rtnl_set_sk_err);
linux v2.6.22.y-op