?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
[NET]: rtnl_unlock cleanups, fix netdev_run_todo dead-lock
[tomato.git] / release / src-rt / linux / linux-2.6 / net / core / rtnetlink.c
blobd9cbfc95ae88b6c9c80afe3e3efca185bacb71ce
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 /* This fellow will unlock it for us. */
77 netdev_run_todo();
78 }
79
80 int rtnl_trylock(void)
81 {
82 return mutex_trylock(&rtnl_mutex);
83 }
84
85 int rtattr_parse(struct rtattr *tb[], int maxattr, struct rtattr *rta, int len)
86 {
87 memset(tb, 0, sizeof(struct rtattr*)*maxattr);
88
89 while (RTA_OK(rta, len)) {
90 unsigned flavor = rta->rta_type;
91 if (flavor && flavor <= maxattr)
92 tb[flavor-1] = rta;
93 rta = RTA_NEXT(rta, len);
94 }
95 return 0;
96 }
97
98 static struct rtnl_link *rtnl_msg_handlers[NPROTO];
99
100 static inline int rtm_msgindex(int msgtype)
101 {
102 int msgindex = msgtype - RTM_BASE;
103
104 /*
105 * msgindex < 0 implies someone tried to register a netlink
106 * control code. msgindex >= RTM_NR_MSGTYPES may indicate that
107 * the message type has not been added to linux/rtnetlink.h
108 */
109 BUG_ON(msgindex < 0 || msgindex >= RTM_NR_MSGTYPES);
110
111 return msgindex;
112 }
113
114 static rtnl_doit_func rtnl_get_doit(int protocol, int msgindex)
115 {
116 struct rtnl_link *tab;
117
118 tab = rtnl_msg_handlers[protocol];
119 if (tab == NULL || tab[msgindex].doit == NULL)
120 tab = rtnl_msg_handlers[PF_UNSPEC];
121
122 return tab ? tab[msgindex].doit : NULL;
123 }
124
125 static rtnl_dumpit_func rtnl_get_dumpit(int protocol, int msgindex)
126 {
127 struct rtnl_link *tab;
128
129 tab = rtnl_msg_handlers[protocol];
130 if (tab == NULL || tab[msgindex].dumpit == NULL)
131 tab = rtnl_msg_handlers[PF_UNSPEC];
132
133 return tab ? tab[msgindex].dumpit : NULL;
134 }
135
136 /**
137 * __rtnl_register - Register a rtnetlink message type
138 * @protocol: Protocol family or PF_UNSPEC
139 * @msgtype: rtnetlink message type
140 * @doit: Function pointer called for each request message
141 * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message
142 *
143 * Registers the specified function pointers (at least one of them has
144 * to be non-NULL) to be called whenever a request message for the
145 * specified protocol family and message type is received.
146 *
147 * The special protocol family PF_UNSPEC may be used to define fallback
148 * function pointers for the case when no entry for the specific protocol
149 * family exists.
150 *
151 * Returns 0 on success or a negative error code.
152 */
153 int __rtnl_register(int protocol, int msgtype,
154 rtnl_doit_func doit, rtnl_dumpit_func dumpit)
155 {
156 struct rtnl_link *tab;
157 int msgindex;
158
159 BUG_ON(protocol < 0 || protocol >= NPROTO);
160 msgindex = rtm_msgindex(msgtype);
161
162 tab = rtnl_msg_handlers[protocol];
163 if (tab == NULL) {
164 tab = kcalloc(RTM_NR_MSGTYPES, sizeof(*tab), GFP_KERNEL);
165 if (tab == NULL)
166 return -ENOBUFS;
167
168 rtnl_msg_handlers[protocol] = tab;
169 }
170
171 if (doit)
172 tab[msgindex].doit = doit;
173
174 if (dumpit)
175 tab[msgindex].dumpit = dumpit;
176
177 return 0;
178 }
179
180 EXPORT_SYMBOL_GPL(__rtnl_register);
181
182 /**
183 * rtnl_register - Register a rtnetlink message type
184 *
185 * Identical to __rtnl_register() but panics on failure. This is useful
186 * as failure of this function is very unlikely, it can only happen due
187 * to lack of memory when allocating the chain to store all message
188 * handlers for a protocol. Meant for use in init functions where lack
189 * of memory implies no sense in continueing.
190 */
191 void rtnl_register(int protocol, int msgtype,
192 rtnl_doit_func doit, rtnl_dumpit_func dumpit)
193 {
194 if (__rtnl_register(protocol, msgtype, doit, dumpit) < 0)
195 panic("Unable to register rtnetlink message handler, "
196 "protocol = %d, message type = %d\n",
197 protocol, msgtype);
198 }
199
200 EXPORT_SYMBOL_GPL(rtnl_register);
201
202 /**
203 * rtnl_unregister - Unregister a rtnetlink message type
204 * @protocol: Protocol family or PF_UNSPEC
205 * @msgtype: rtnetlink message type
206 *
207 * Returns 0 on success or a negative error code.
208 */
209 int rtnl_unregister(int protocol, int msgtype)
210 {
211 int msgindex;
212
213 BUG_ON(protocol < 0 || protocol >= NPROTO);
214 msgindex = rtm_msgindex(msgtype);
215
216 if (rtnl_msg_handlers[protocol] == NULL)
217 return -ENOENT;
218
219 rtnl_msg_handlers[protocol][msgindex].doit = NULL;
220 rtnl_msg_handlers[protocol][msgindex].dumpit = NULL;
221
222 return 0;
223 }
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
242 EXPORT_SYMBOL_GPL(rtnl_unregister_all);
243
244 static LIST_HEAD(link_ops);
245
246 /**
247 * __rtnl_link_register - Register rtnl_link_ops with rtnetlink.
248 * @ops: struct rtnl_link_ops * to register
249 *
250 * The caller must hold the rtnl_mutex. This function should be used
251 * by drivers that create devices during module initialization. It
252 * must be called before registering the devices.
253 *
254 * Returns 0 on success or a negative error code.
255 */
256 int __rtnl_link_register(struct rtnl_link_ops *ops)
257 {
258 list_add_tail(&ops->list, &link_ops);
259 return 0;
260 }
261
262 EXPORT_SYMBOL_GPL(__rtnl_link_register);
263
264 /**
265 * rtnl_link_register - Register rtnl_link_ops with rtnetlink.
266 * @ops: struct rtnl_link_ops * to register
267 *
268 * Returns 0 on success or a negative error code.
269 */
270 int rtnl_link_register(struct rtnl_link_ops *ops)
271 {
272 int err;
273
274 rtnl_lock();
275 err = __rtnl_link_register(ops);
276 rtnl_unlock();
277 return err;
278 }
279
280 EXPORT_SYMBOL_GPL(rtnl_link_register);
281
282 /**
283 * __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
284 * @ops: struct rtnl_link_ops * to unregister
285 *
286 * The caller must hold the rtnl_mutex. This function should be used
287 * by drivers that unregister devices during module unloading. It must
288 * be called after unregistering the devices.
289 */
290 void __rtnl_link_unregister(struct rtnl_link_ops *ops)
291 {
292 list_del(&ops->list);
293 }
294
295 EXPORT_SYMBOL_GPL(__rtnl_link_unregister);
296
297 /**
298 * rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
299 * @ops: struct rtnl_link_ops * to unregister
300 */
301 void rtnl_link_unregister(struct rtnl_link_ops *ops)
302 {
303 rtnl_lock();
304 __rtnl_link_unregister(ops);
305 rtnl_unlock();
306 }
307
308 EXPORT_SYMBOL_GPL(rtnl_link_unregister);
309
310 static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind)
311 {
312 const struct rtnl_link_ops *ops;
313
314 list_for_each_entry(ops, &link_ops, list) {
315 if (!strcmp(ops->kind, kind))
316 return ops;
317 }
318 return NULL;
319 }
320
321 static size_t rtnl_link_get_size(const struct net_device *dev)
322 {
323 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
324 size_t size;
325
326 if (!ops)
327 return 0;
328
329 size = nlmsg_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */
330 nlmsg_total_size(strlen(ops->kind) + 1); /* IFLA_INFO_KIND */
331
332 if (ops->get_size)
333 /* IFLA_INFO_DATA + nested data */
334 size += nlmsg_total_size(sizeof(struct nlattr)) +
335 ops->get_size(dev);
336
337 if (ops->get_xstats_size)
338 size += ops->get_xstats_size(dev); /* IFLA_INFO_XSTATS */
339
340 return size;
341 }
342
343 static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev)
344 {
345 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
346 struct nlattr *linkinfo, *data;
347 int err = -EMSGSIZE;
348
349 linkinfo = nla_nest_start(skb, IFLA_LINKINFO);
350 if (linkinfo == NULL)
351 goto out;
352
353 if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0)
354 goto err_cancel_link;
355 if (ops->fill_xstats) {
356 err = ops->fill_xstats(skb, dev);
357 if (err < 0)
358 goto err_cancel_link;
359 }
360 if (ops->fill_info) {
361 data = nla_nest_start(skb, IFLA_INFO_DATA);
362 if (data == NULL)
363 goto err_cancel_link;
364 err = ops->fill_info(skb, dev);
365 if (err < 0)
366 goto err_cancel_data;
367 nla_nest_end(skb, data);
368 }
369
370 nla_nest_end(skb, linkinfo);
371 return 0;
372
373 err_cancel_data:
374 nla_nest_cancel(skb, data);
375 err_cancel_link:
376 nla_nest_cancel(skb, linkinfo);
377 out:
378 return err;
379 }
380
381 static const int rtm_min[RTM_NR_FAMILIES] =
382 {
383 [RTM_FAM(RTM_NEWLINK)] = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
384 [RTM_FAM(RTM_NEWADDR)] = NLMSG_LENGTH(sizeof(struct ifaddrmsg)),
385 [RTM_FAM(RTM_NEWROUTE)] = NLMSG_LENGTH(sizeof(struct rtmsg)),
386 [RTM_FAM(RTM_NEWRULE)] = NLMSG_LENGTH(sizeof(struct fib_rule_hdr)),
387 [RTM_FAM(RTM_NEWQDISC)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
388 [RTM_FAM(RTM_NEWTCLASS)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
389 [RTM_FAM(RTM_NEWTFILTER)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
390 [RTM_FAM(RTM_NEWACTION)] = NLMSG_LENGTH(sizeof(struct tcamsg)),
391 [RTM_FAM(RTM_GETMULTICAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
392 [RTM_FAM(RTM_GETANYCAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
393 };
394
395 static const int rta_max[RTM_NR_FAMILIES] =
396 {
397 [RTM_FAM(RTM_NEWLINK)] = IFLA_MAX,
398 [RTM_FAM(RTM_NEWADDR)] = IFA_MAX,
399 [RTM_FAM(RTM_NEWROUTE)] = RTA_MAX,
400 [RTM_FAM(RTM_NEWRULE)] = FRA_MAX,
401 [RTM_FAM(RTM_NEWQDISC)] = TCA_MAX,
402 [RTM_FAM(RTM_NEWTCLASS)] = TCA_MAX,
403 [RTM_FAM(RTM_NEWTFILTER)] = TCA_MAX,
404 [RTM_FAM(RTM_NEWACTION)] = TCAA_MAX,
405 };
406
407 void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const void *data)
408 {
409 struct rtattr *rta;
410 int size = RTA_LENGTH(attrlen);
411
412 rta = (struct rtattr*)skb_put(skb, RTA_ALIGN(size));
413 rta->rta_type = attrtype;
414 rta->rta_len = size;
415 memcpy(RTA_DATA(rta), data, attrlen);
416 memset(RTA_DATA(rta) + attrlen, 0, RTA_ALIGN(size) - size);
417 }
418
419 size_t rtattr_strlcpy(char *dest, const struct rtattr *rta, size_t size)
420 {
421 size_t ret = RTA_PAYLOAD(rta);
422 char *src = RTA_DATA(rta);
423
424 if (ret > 0 && src[ret - 1] == '\0')
425 ret--;
426 if (size > 0) {
427 size_t len = (ret >= size) ? size - 1 : ret;
428 memset(dest, 0, size);
429 memcpy(dest, src, len);
430 }
431 return ret;
432 }
433
434 int rtnetlink_send(struct sk_buff *skb, u32 pid, unsigned group, int echo)
435 {
436 int err = 0;
437
438 NETLINK_CB(skb).dst_group = group;
439 if (echo)
440 atomic_inc(&skb->users);
441 netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL);
442 if (echo)
443 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
444 return err;
445 }
446
447 int rtnl_unicast(struct sk_buff *skb, u32 pid)
448 {
449 return nlmsg_unicast(rtnl, skb, pid);
450 }
451
452 int rtnl_notify(struct sk_buff *skb, u32 pid, u32 group,
453 struct nlmsghdr *nlh, gfp_t flags)
454 {
455 int report = 0;
456
457 if (nlh)
458 report = nlmsg_report(nlh);
459
460 return nlmsg_notify(rtnl, skb, pid, group, report, flags);
461 }
462
463 void rtnl_set_sk_err(u32 group, int error)
464 {
465 netlink_set_err(rtnl, 0, group, error);
466 }
467
468 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics)
469 {
470 struct nlattr *mx;
471 int i, valid = 0;
472
473 mx = nla_nest_start(skb, RTA_METRICS);
474 if (mx == NULL)
475 return -ENOBUFS;
476
477 for (i = 0; i < RTAX_MAX; i++) {
478 if (metrics[i]) {
479 valid++;
480 NLA_PUT_U32(skb, i+1, metrics[i]);
481 }
482 }
483
484 if (!valid) {
485 nla_nest_cancel(skb, mx);
486 return 0;
487 }
488
489 return nla_nest_end(skb, mx);
490
491 nla_put_failure:
492 return nla_nest_cancel(skb, mx);
493 }
494
495 int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id,
496 u32 ts, u32 tsage, long expires, u32 error)
497 {
498 struct rta_cacheinfo ci = {
499 .rta_lastuse = jiffies_to_clock_t(jiffies - dst->lastuse),
500 .rta_used = dst->__use,
501 .rta_clntref = atomic_read(&(dst->__refcnt)),
502 .rta_error = error,
503 .rta_id = id,
504 .rta_ts = ts,
505 .rta_tsage = tsage,
506 };
507
508 if (expires)
509 ci.rta_expires = jiffies_to_clock_t(expires);
510
511 return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci);
512 }
513
514 EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo);
515
516 static void set_operstate(struct net_device *dev, unsigned char transition)
517 {
518 unsigned char operstate = dev->operstate;
519
520 switch(transition) {
521 case IF_OPER_UP:
522 if ((operstate == IF_OPER_DORMANT ||
523 operstate == IF_OPER_UNKNOWN) &&
524 !netif_dormant(dev))
525 operstate = IF_OPER_UP;
526 break;
527
528 case IF_OPER_DORMANT:
529 if (operstate == IF_OPER_UP ||
530 operstate == IF_OPER_UNKNOWN)
531 operstate = IF_OPER_DORMANT;
532 break;
533 }
534
535 if (dev->operstate != operstate) {
536 write_lock_bh(&dev_base_lock);
537 dev->operstate = operstate;
538 write_unlock_bh(&dev_base_lock);
539 netdev_state_change(dev);
540 }
541 }
542
543 static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
544 struct net_device_stats *b)
545 {
546 a->rx_packets = b->rx_packets;
547 a->tx_packets = b->tx_packets;
548 a->rx_bytes = b->rx_bytes;
549 a->tx_bytes = b->tx_bytes;
550 a->rx_errors = b->rx_errors;
551 a->tx_errors = b->tx_errors;
552 a->rx_dropped = b->rx_dropped;
553 a->tx_dropped = b->tx_dropped;
554
555 a->multicast = b->multicast;
556 a->collisions = b->collisions;
557
558 a->rx_length_errors = b->rx_length_errors;
559 a->rx_over_errors = b->rx_over_errors;
560 a->rx_crc_errors = b->rx_crc_errors;
561 a->rx_frame_errors = b->rx_frame_errors;
562 a->rx_fifo_errors = b->rx_fifo_errors;
563 a->rx_missed_errors = b->rx_missed_errors;
564
565 a->tx_aborted_errors = b->tx_aborted_errors;
566 a->tx_carrier_errors = b->tx_carrier_errors;
567 a->tx_fifo_errors = b->tx_fifo_errors;
568 a->tx_heartbeat_errors = b->tx_heartbeat_errors;
569 a->tx_window_errors = b->tx_window_errors;
570
571 a->rx_compressed = b->rx_compressed;
572 a->tx_compressed = b->tx_compressed;
573 };
574
575 static inline size_t if_nlmsg_size(const struct net_device *dev)
576 {
577 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
578 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
579 + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */
580 + nla_total_size(sizeof(struct rtnl_link_ifmap))
581 + nla_total_size(sizeof(struct rtnl_link_stats))
582 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
583 + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */
584 + nla_total_size(4) /* IFLA_TXQLEN */
585 + nla_total_size(4) /* IFLA_WEIGHT */
586 + nla_total_size(4) /* IFLA_MTU */
587 + nla_total_size(4) /* IFLA_LINK */
588 + nla_total_size(4) /* IFLA_MASTER */
589 + nla_total_size(1) /* IFLA_OPERSTATE */
590 + nla_total_size(1) /* IFLA_LINKMODE */
591 + rtnl_link_get_size(dev); /* IFLA_LINKINFO */
592 }
593
594 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
595 int type, u32 pid, u32 seq, u32 change,
596 unsigned int flags)
597 {
598 struct ifinfomsg *ifm;
599 struct nlmsghdr *nlh;
600
601 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
602 if (nlh == NULL)
603 return -EMSGSIZE;
604
605 ifm = nlmsg_data(nlh);
606 ifm->ifi_family = AF_UNSPEC;
607 ifm->__ifi_pad = 0;
608 ifm->ifi_type = dev->type;
609 ifm->ifi_index = dev->ifindex;
610 ifm->ifi_flags = dev_get_flags(dev);
611 ifm->ifi_change = change;
612
613 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
614 NLA_PUT_U32(skb, IFLA_TXQLEN, dev->tx_queue_len);
615 NLA_PUT_U32(skb, IFLA_WEIGHT, dev->weight);
616 NLA_PUT_U8(skb, IFLA_OPERSTATE,
617 netif_running(dev) ? dev->operstate : IF_OPER_DOWN);
618 NLA_PUT_U8(skb, IFLA_LINKMODE, dev->link_mode);
619 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
620
621 if (dev->ifindex != dev->iflink)
622 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
623
624 if (dev->master)
625 NLA_PUT_U32(skb, IFLA_MASTER, dev->master->ifindex);
626
627 if (dev->qdisc_sleeping)
628 NLA_PUT_STRING(skb, IFLA_QDISC, dev->qdisc_sleeping->ops->id);
629
630 if (1) {
631 struct rtnl_link_ifmap map = {
632 .mem_start = dev->mem_start,
633 .mem_end = dev->mem_end,
634 .base_addr = dev->base_addr,
635 .irq = dev->irq,
636 .dma = dev->dma,
637 .port = dev->if_port,
638 };
639 NLA_PUT(skb, IFLA_MAP, sizeof(map), &map);
640 }
641
642 if (dev->addr_len) {
643 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
644 NLA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast);
645 }
646
647 if (dev->get_stats) {
648 struct net_device_stats *stats = dev->get_stats(dev);
649 if (stats) {
650 struct nlattr *attr;
651
652 attr = nla_reserve(skb, IFLA_STATS,
653 sizeof(struct rtnl_link_stats));
654 if (attr == NULL)
655 goto nla_put_failure;
656
657 copy_rtnl_link_stats(nla_data(attr), stats);
658 }
659 }
660
661 if (dev->rtnl_link_ops) {
662 if (rtnl_link_fill(skb, dev) < 0)
663 goto nla_put_failure;
664 }
665
666 return nlmsg_end(skb, nlh);
667
668 nla_put_failure:
669 nlmsg_cancel(skb, nlh);
670 return -EMSGSIZE;
671 }
672
673 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
674 {
675 int idx;
676 int s_idx = cb->args[0];
677 struct net_device *dev;
678
679 idx = 0;
680 for_each_netdev(dev) {
681 if (idx < s_idx)
682 goto cont;
683 if (rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK,
684 NETLINK_CB(cb->skb).pid,
685 cb->nlh->nlmsg_seq, 0, NLM_F_MULTI) <= 0)
686 break;
687 cont:
688 idx++;
689 }
690 cb->args[0] = idx;
691
692 return skb->len;
693 }
694
695 static const struct nla_policy ifla_policy[IFLA_MAX+1] = {
696 [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 },
697 [IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
698 [IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
699 [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) },
700 [IFLA_MTU] = { .type = NLA_U32 },
701 [IFLA_TXQLEN] = { .type = NLA_U32 },
702 [IFLA_WEIGHT] = { .type = NLA_U32 },
703 [IFLA_OPERSTATE] = { .type = NLA_U8 },
704 [IFLA_LINKMODE] = { .type = NLA_U8 },
705 };
706
707 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
708 [IFLA_INFO_KIND] = { .type = NLA_STRING },
709 [IFLA_INFO_DATA] = { .type = NLA_NESTED },
710 };
711
712 static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm,
713 struct nlattr **tb, char *ifname, int modified)
714 {
715 int send_addr_notify = 0;
716 int err;
717
718 if (tb[IFLA_MAP]) {
719 struct rtnl_link_ifmap *u_map;
720 struct ifmap k_map;
721
722 if (!dev->set_config) {
723 err = -EOPNOTSUPP;
724 goto errout;
725 }
726
727 if (!netif_device_present(dev)) {
728 err = -ENODEV;
729 goto errout;
730 }
731
732 u_map = nla_data(tb[IFLA_MAP]);
733 k_map.mem_start = (unsigned long) u_map->mem_start;
734 k_map.mem_end = (unsigned long) u_map->mem_end;
735 k_map.base_addr = (unsigned short) u_map->base_addr;
736 k_map.irq = (unsigned char) u_map->irq;
737 k_map.dma = (unsigned char) u_map->dma;
738 k_map.port = (unsigned char) u_map->port;
739
740 err = dev->set_config(dev, &k_map);
741 if (err < 0)
742 goto errout;
743
744 modified = 1;
745 }
746
747 if (tb[IFLA_ADDRESS]) {
748 struct sockaddr *sa;
749 int len;
750
751 if (!dev->set_mac_address) {
752 err = -EOPNOTSUPP;
753 goto errout;
754 }
755
756 if (!netif_device_present(dev)) {
757 err = -ENODEV;
758 goto errout;
759 }
760
761 len = sizeof(sa_family_t) + dev->addr_len;
762 sa = kmalloc(len, GFP_KERNEL);
763 if (!sa) {
764 err = -ENOMEM;
765 goto errout;
766 }
767 sa->sa_family = dev->type;
768 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
769 dev->addr_len);
770 err = dev->set_mac_address(dev, sa);
771 kfree(sa);
772 if (err)
773 goto errout;
774 send_addr_notify = 1;
775 modified = 1;
776 }
777
778 if (tb[IFLA_MTU]) {
779 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
780 if (err < 0)
781 goto errout;
782 modified = 1;
783 }
784
785 /*
786 * Interface selected by interface index but interface
787 * name provided implies that a name change has been
788 * requested.
789 */
790 if (ifm->ifi_index > 0 && ifname[0]) {
791 err = dev_change_name(dev, ifname);
792 if (err < 0)
793 goto errout;
794 modified = 1;
795 }
796
797 if (tb[IFLA_BROADCAST]) {
798 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
799 send_addr_notify = 1;
800 }
801
802
803 if (ifm->ifi_flags || ifm->ifi_change) {
804 unsigned int flags = ifm->ifi_flags;
805
806 /* bugwards compatibility: ifi_change == 0 is treated as ~0 */
807 if (ifm->ifi_change)
808 flags = (flags & ifm->ifi_change) |
809 (dev->flags & ~ifm->ifi_change);
810 dev_change_flags(dev, flags);
811 }
812
813 if (tb[IFLA_TXQLEN])
814 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
815
816 if (tb[IFLA_WEIGHT])
817 dev->weight = nla_get_u32(tb[IFLA_WEIGHT]);
818
819 if (tb[IFLA_OPERSTATE])
820 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
821
822 if (tb[IFLA_LINKMODE]) {
823 write_lock_bh(&dev_base_lock);
824 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
825 write_unlock_bh(&dev_base_lock);
826 }
827
828 err = 0;
829
830 errout:
831 if (err < 0 && modified && net_ratelimit())
832 printk(KERN_WARNING "A link change request failed with "
833 "some changes comitted already. Interface %s may "
834 "have been left with an inconsistent configuration, "
835 "please check.\n", dev->name);
836
837 if (send_addr_notify)
838 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
839 return err;
840 }
841
842 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
843 {
844 struct ifinfomsg *ifm;
845 struct net_device *dev;
846 int err;
847 struct nlattr *tb[IFLA_MAX+1];
848 char ifname[IFNAMSIZ];
849
850 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
851 if (err < 0)
852 goto errout;
853
854 if (tb[IFLA_IFNAME])
855 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
856 else
857 ifname[0] = '\0';
858
859 err = -EINVAL;
860 ifm = nlmsg_data(nlh);
861 if (ifm->ifi_index > 0)
862 dev = dev_get_by_index(ifm->ifi_index);
863 else if (tb[IFLA_IFNAME])
864 dev = dev_get_by_name(ifname);
865 else
866 goto errout;
867
868 if (dev == NULL) {
869 err = -ENODEV;
870 goto errout;
871 }
872
873 if (tb[IFLA_ADDRESS] &&
874 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
875 goto errout_dev;
876
877 if (tb[IFLA_BROADCAST] &&
878 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
879 goto errout_dev;
880
881 err = do_setlink(dev, ifm, tb, ifname, 0);
882 errout_dev:
883 dev_put(dev);
884 errout:
885 return err;
886 }
887
888 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
889 {
890 const struct rtnl_link_ops *ops;
891 struct net_device *dev;
892 struct ifinfomsg *ifm;
893 char ifname[IFNAMSIZ];
894 struct nlattr *tb[IFLA_MAX+1];
895 int err;
896
897 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
898 if (err < 0)
899 return err;
900
901 if (tb[IFLA_IFNAME])
902 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
903
904 ifm = nlmsg_data(nlh);
905 if (ifm->ifi_index > 0)
906 dev = __dev_get_by_index(ifm->ifi_index);
907 else if (tb[IFLA_IFNAME])
908 dev = __dev_get_by_name(ifname);
909 else
910 return -EINVAL;
911
912 if (!dev)
913 return -ENODEV;
914
915 ops = dev->rtnl_link_ops;
916 if (!ops)
917 return -EOPNOTSUPP;
918
919 ops->dellink(dev);
920 return 0;
921 }
922
923 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
924 {
925 const struct rtnl_link_ops *ops;
926 struct net_device *dev;
927 struct ifinfomsg *ifm;
928 char kind[MODULE_NAME_LEN];
929 char ifname[IFNAMSIZ];
930 struct nlattr *tb[IFLA_MAX+1];
931 struct nlattr *linkinfo[IFLA_INFO_MAX+1];
932 int err;
933
934 replay:
935 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
936 if (err < 0)
937 return err;
938
939 if (tb[IFLA_IFNAME])
940 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
941 else
942 ifname[0] = '\0';
943
944 ifm = nlmsg_data(nlh);
945 if (ifm->ifi_index > 0)
946 dev = __dev_get_by_index(ifm->ifi_index);
947 else if (ifname[0])
948 dev = __dev_get_by_name(ifname);
949 else
950 dev = NULL;
951
952 if (tb[IFLA_LINKINFO]) {
953 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX,
954 tb[IFLA_LINKINFO], ifla_info_policy);
955 if (err < 0)
956 return err;
957 } else
958 memset(linkinfo, 0, sizeof(linkinfo));
959
960 if (linkinfo[IFLA_INFO_KIND]) {
961 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind));
962 ops = rtnl_link_ops_get(kind);
963 } else {
964 kind[0] = '\0';
965 ops = NULL;
966 }
967
968 if (1) {
969 struct nlattr *attr[ops ? ops->maxtype + 1 : 0], **data = NULL;
970
971 if (ops) {
972 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
973 err = nla_parse_nested(attr, ops->maxtype,
974 linkinfo[IFLA_INFO_DATA],
975 ops->policy);
976 if (err < 0)
977 return err;
978 data = attr;
979 }
980 if (ops->validate) {
981 err = ops->validate(tb, data);
982 if (err < 0)
983 return err;
984 }
985 }
986
987 if (dev) {
988 int modified = 0;
989
990 if (nlh->nlmsg_flags & NLM_F_EXCL)
991 return -EEXIST;
992 if (nlh->nlmsg_flags & NLM_F_REPLACE)
993 return -EOPNOTSUPP;
994
995 if (linkinfo[IFLA_INFO_DATA]) {
996 if (!ops || ops != dev->rtnl_link_ops ||
997 !ops->changelink)
998 return -EOPNOTSUPP;
999
1000 err = ops->changelink(dev, tb, data);
1001 if (err < 0)
1002 return err;
1003 modified = 1;
1004 }
1005
1006 return do_setlink(dev, ifm, tb, ifname, modified);
1007 }
1008
1009 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
1010 return -ENODEV;
1011
1012 if (ifm->ifi_index || ifm->ifi_flags || ifm->ifi_change)
1013 return -EOPNOTSUPP;
1014 if (tb[IFLA_ADDRESS] || tb[IFLA_BROADCAST] || tb[IFLA_MAP] ||
1015 tb[IFLA_MASTER] || tb[IFLA_PROTINFO])
1016 return -EOPNOTSUPP;
1017
1018 if (!ops) {
1019 #ifdef CONFIG_KMOD
1020 if (kind[0]) {
1021 __rtnl_unlock();
1022 request_module("rtnl-link-%s", kind);
1023 rtnl_lock();
1024 ops = rtnl_link_ops_get(kind);
1025 if (ops)
1026 goto replay;
1027 }
1028 #endif
1029 return -EOPNOTSUPP;
1030 }
1031
1032 if (!ifname[0])
1033 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
1034 dev = alloc_netdev(ops->priv_size, ifname, ops->setup);
1035 if (!dev)
1036 return -ENOMEM;
1037
1038 if (strchr(dev->name, '%')) {
1039 err = dev_alloc_name(dev, dev->name);
1040 if (err < 0)
1041 goto err_free;
1042 }
1043 dev->rtnl_link_ops = ops;
1044
1045 if (tb[IFLA_MTU])
1046 dev->mtu = nla_get_u32(tb[IFLA_MTU]);
1047 if (tb[IFLA_TXQLEN])
1048 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
1049 if (tb[IFLA_WEIGHT])
1050 dev->weight = nla_get_u32(tb[IFLA_WEIGHT]);
1051 if (tb[IFLA_OPERSTATE])
1052 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
1053 if (tb[IFLA_LINKMODE])
1054 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
1055
1056 err = ops->newlink(dev, tb, data);
1057 err_free:
1058 if (err < 0)
1059 free_netdev(dev);
1060 return err;
1061 }
1062 }
1063
1064 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
1065 {
1066 struct ifinfomsg *ifm;
1067 struct nlattr *tb[IFLA_MAX+1];
1068 struct net_device *dev = NULL;
1069 struct sk_buff *nskb;
1070 int err;
1071
1072 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1073 if (err < 0)
1074 return err;
1075
1076 ifm = nlmsg_data(nlh);
1077 if (ifm->ifi_index > 0) {
1078 dev = dev_get_by_index(ifm->ifi_index);
1079 if (dev == NULL)
1080 return -ENODEV;
1081 } else
1082 return -EINVAL;
1083
1084 nskb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL);
1085 if (nskb == NULL) {
1086 err = -ENOBUFS;
1087 goto errout;
1088 }
1089
1090 err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).pid,
1091 nlh->nlmsg_seq, 0, 0);
1092 if (err < 0) {
1093 /* -EMSGSIZE implies BUG in if_nlmsg_size */
1094 WARN_ON(err == -EMSGSIZE);
1095 kfree_skb(nskb);
1096 goto errout;
1097 }
1098 err = rtnl_unicast(nskb, NETLINK_CB(skb).pid);
1099 errout:
1100 dev_put(dev);
1101
1102 return err;
1103 }
1104
1105 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
1106 {
1107 int idx;
1108 int s_idx = cb->family;
1109
1110 if (s_idx == 0)
1111 s_idx = 1;
1112 for (idx=1; idx<NPROTO; idx++) {
1113 int type = cb->nlh->nlmsg_type-RTM_BASE;
1114 if (idx < s_idx || idx == PF_PACKET)
1115 continue;
1116 if (rtnl_msg_handlers[idx] == NULL ||
1117 rtnl_msg_handlers[idx][type].dumpit == NULL)
1118 continue;
1119 if (idx > s_idx)
1120 memset(&cb->args[0], 0, sizeof(cb->args));
1121 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb))
1122 break;
1123 }
1124 cb->family = idx;
1125
1126 return skb->len;
1127 }
1128
1129 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change)
1130 {
1131 struct sk_buff *skb;
1132 int err = -ENOBUFS;
1133
1134 skb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL);
1135 if (skb == NULL)
1136 goto errout;
1137
1138 err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0);
1139 if (err < 0) {
1140 /* -EMSGSIZE implies BUG in if_nlmsg_size() */
1141 WARN_ON(err == -EMSGSIZE);
1142 kfree_skb(skb);
1143 goto errout;
1144 }
1145 err = rtnl_notify(skb, 0, RTNLGRP_LINK, NULL, GFP_KERNEL);
1146 errout:
1147 if (err < 0)
1148 rtnl_set_sk_err(RTNLGRP_LINK, err);
1149 }
1150
1151 /* Protected by RTNL sempahore. */
1152 static struct rtattr **rta_buf;
1153 static int rtattr_max;
1154
1155 /* Process one rtnetlink message. */
1156
1157 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
1158 {
1159 rtnl_doit_func doit;
1160 int sz_idx, kind;
1161 int min_len;
1162 int family;
1163 int type;
1164 int err;
1165
1166 type = nlh->nlmsg_type;
1167 if (type > RTM_MAX)
1168 return -EOPNOTSUPP;
1169
1170 type -= RTM_BASE;
1171
1172 /* All the messages must have at least 1 byte length */
1173 if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg)))
1174 return 0;
1175
1176 family = ((struct rtgenmsg*)NLMSG_DATA(nlh))->rtgen_family;
1177 if (family >= NPROTO)
1178 return -EAFNOSUPPORT;
1179
1180 sz_idx = type>>2;
1181 kind = type&3;
1182
1183 if (kind != 2 && security_netlink_recv(skb, CAP_NET_ADMIN))
1184 return -EPERM;
1185
1186 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
1187 rtnl_dumpit_func dumpit;
1188
1189 dumpit = rtnl_get_dumpit(family, type);
1190 if (dumpit == NULL)
1191 return -EOPNOTSUPP;
1192
1193 __rtnl_unlock();
1194 err = netlink_dump_start(rtnl, skb, nlh, dumpit, NULL);
1195 rtnl_lock();
1196 return err;
1197 }
1198
1199 memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *)));
1200
1201 min_len = rtm_min[sz_idx];
1202 if (nlh->nlmsg_len < min_len)
1203 return -EINVAL;
1204
1205 if (nlh->nlmsg_len > min_len) {
1206 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
1207 struct rtattr *attr = (void*)nlh + NLMSG_ALIGN(min_len);
1208
1209 while (RTA_OK(attr, attrlen)) {
1210 unsigned flavor = attr->rta_type;
1211 if (flavor) {
1212 if (flavor > rta_max[sz_idx])
1213 return -EINVAL;
1214 rta_buf[flavor-1] = attr;
1215 }
1216 attr = RTA_NEXT(attr, attrlen);
1217 }
1218 }
1219
1220 doit = rtnl_get_doit(family, type);
1221 if (doit == NULL)
1222 return -EOPNOTSUPP;
1223
1224 return doit(skb, nlh, (void *)&rta_buf[0]);
1225 }
1226
1227 static void rtnetlink_rcv(struct sock *sk, int len)
1228 {
1229 unsigned int qlen = 0;
1230
1231 do {
1232 rtnl_lock();
1233 netlink_run_queue(sk, &qlen, &rtnetlink_rcv_msg);
1234 rtnl_unlock();
1235 } while (qlen);
1236 }
1237
1238 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
1239 {
1240 struct net_device *dev = ptr;
1241 switch (event) {
1242 case NETDEV_UNREGISTER:
1243 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);
1244 break;
1245 case NETDEV_REGISTER:
1246 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
1247 break;
1248 case NETDEV_UP:
1249 case NETDEV_DOWN:
1250 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
1251 break;
1252 case NETDEV_CHANGE:
1253 case NETDEV_GOING_DOWN:
1254 break;
1255 default:
1256 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
1257 break;
1258 }
1259 return NOTIFY_DONE;
1260 }
1261
1262 static struct notifier_block rtnetlink_dev_notifier = {
1263 .notifier_call = rtnetlink_event,
1264 };
1265
1266 void __init rtnetlink_init(void)
1267 {
1268 int i;
1269
1270 rtattr_max = 0;
1271 for (i = 0; i < ARRAY_SIZE(rta_max); i++)
1272 if (rta_max[i] > rtattr_max)
1273 rtattr_max = rta_max[i];
1274 rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL);
1275 if (!rta_buf)
1276 panic("rtnetlink_init: cannot allocate rta_buf\n");
1277
1278 rtnl = netlink_kernel_create(NETLINK_ROUTE, RTNLGRP_MAX, rtnetlink_rcv,
1279 &rtnl_mutex, THIS_MODULE);
1280 if (rtnl == NULL)
1281 panic("rtnetlink_init: cannot initialize rtnetlink\n");
1282 netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV);
1283 register_netdevice_notifier(&rtnetlink_dev_notifier);
1284
1285 rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink, rtnl_dump_ifinfo);
1286 rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL);
1287 rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL);
1288 rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL);
1289
1290 rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all);
1291 rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all);
1292 }
1293
1294 EXPORT_SYMBOL(__rta_fill);
1295 EXPORT_SYMBOL(rtattr_strlcpy);
1296 EXPORT_SYMBOL(rtattr_parse);
1297 EXPORT_SYMBOL(rtnetlink_put_metrics);
1298 EXPORT_SYMBOL(rtnl_lock);
1299 EXPORT_SYMBOL(rtnl_trylock);
1300 EXPORT_SYMBOL(rtnl_unlock);
1301 EXPORT_SYMBOL(rtnl_unicast);
1302 EXPORT_SYMBOL(rtnl_notify);
1303 EXPORT_SYMBOL(rtnl_set_sk_err);
Tomato firmware and modifications.