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allow coexistance of N build and AC build.
[tomato.git] / release / src-rt-6.x / linux / linux-2.6 / net / core / rtnetlink.c
blob4745ed5162ce5a33c5967478f9a87fb8e4e049d0
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 = nla_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */
330 nla_total_size(strlen(ops->kind) + 1); /* IFLA_INFO_KIND */
331
332 if (ops->get_size)
333 /* IFLA_INFO_DATA + nested data */
334 size += nla_total_size(sizeof(struct nlattr)) +
335 ops->get_size(dev);
336
337 if (ops->get_xstats_size)
338 /* IFLA_INFO_XSTATS */
339 size += nla_total_size(ops->get_xstats_size(dev));
340
341 return size;
342 }
343
344 static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev)
345 {
346 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
347 struct nlattr *linkinfo, *data;
348 int err = -EMSGSIZE;
349
350 linkinfo = nla_nest_start(skb, IFLA_LINKINFO);
351 if (linkinfo == NULL)
352 goto out;
353
354 if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0)
355 goto err_cancel_link;
356 if (ops->fill_xstats) {
357 err = ops->fill_xstats(skb, dev);
358 if (err < 0)
359 goto err_cancel_link;
360 }
361 if (ops->fill_info) {
362 data = nla_nest_start(skb, IFLA_INFO_DATA);
363 if (data == NULL)
364 goto err_cancel_link;
365 err = ops->fill_info(skb, dev);
366 if (err < 0)
367 goto err_cancel_data;
368 nla_nest_end(skb, data);
369 }
370
371 nla_nest_end(skb, linkinfo);
372 return 0;
373
374 err_cancel_data:
375 nla_nest_cancel(skb, data);
376 err_cancel_link:
377 nla_nest_cancel(skb, linkinfo);
378 out:
379 return err;
380 }
381
382 static const int rtm_min[RTM_NR_FAMILIES] =
383 {
384 [RTM_FAM(RTM_NEWLINK)] = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
385 [RTM_FAM(RTM_NEWADDR)] = NLMSG_LENGTH(sizeof(struct ifaddrmsg)),
386 [RTM_FAM(RTM_NEWROUTE)] = NLMSG_LENGTH(sizeof(struct rtmsg)),
387 [RTM_FAM(RTM_NEWRULE)] = NLMSG_LENGTH(sizeof(struct fib_rule_hdr)),
388 [RTM_FAM(RTM_NEWQDISC)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
389 [RTM_FAM(RTM_NEWTCLASS)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
390 [RTM_FAM(RTM_NEWTFILTER)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
391 [RTM_FAM(RTM_NEWACTION)] = NLMSG_LENGTH(sizeof(struct tcamsg)),
392 [RTM_FAM(RTM_GETMULTICAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
393 [RTM_FAM(RTM_GETANYCAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
394 };
395
396 static const int rta_max[RTM_NR_FAMILIES] =
397 {
398 [RTM_FAM(RTM_NEWLINK)] = IFLA_MAX,
399 [RTM_FAM(RTM_NEWADDR)] = IFA_MAX,
400 [RTM_FAM(RTM_NEWROUTE)] = RTA_MAX,
401 [RTM_FAM(RTM_NEWRULE)] = FRA_MAX,
402 [RTM_FAM(RTM_NEWQDISC)] = TCA_MAX,
403 [RTM_FAM(RTM_NEWTCLASS)] = TCA_MAX,
404 [RTM_FAM(RTM_NEWTFILTER)] = TCA_MAX,
405 [RTM_FAM(RTM_NEWACTION)] = TCAA_MAX,
406 };
407
408 void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const void *data)
409 {
410 struct rtattr *rta;
411 int size = RTA_LENGTH(attrlen);
412
413 rta = (struct rtattr*)skb_put(skb, RTA_ALIGN(size));
414 rta->rta_type = attrtype;
415 rta->rta_len = size;
416 memcpy(RTA_DATA(rta), data, attrlen);
417 memset(RTA_DATA(rta) + attrlen, 0, RTA_ALIGN(size) - size);
418 }
419
420 size_t rtattr_strlcpy(char *dest, const struct rtattr *rta, size_t size)
421 {
422 size_t ret = RTA_PAYLOAD(rta);
423 char *src = RTA_DATA(rta);
424
425 if (ret > 0 && src[ret - 1] == '\0')
426 ret--;
427 if (size > 0) {
428 size_t len = (ret >= size) ? size - 1 : ret;
429 memset(dest, 0, size);
430 memcpy(dest, src, len);
431 }
432 return ret;
433 }
434
435 int rtnetlink_send(struct sk_buff *skb, u32 pid, unsigned group, int echo)
436 {
437 int err = 0;
438
439 NETLINK_CB(skb).dst_group = group;
440 if (echo)
441 atomic_inc(&skb->users);
442 netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL);
443 if (echo)
444 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
445 return err;
446 }
447
448 int rtnl_unicast(struct sk_buff *skb, u32 pid)
449 {
450 return nlmsg_unicast(rtnl, skb, pid);
451 }
452
453 int rtnl_notify(struct sk_buff *skb, u32 pid, u32 group,
454 struct nlmsghdr *nlh, gfp_t flags)
455 {
456 int report = 0;
457
458 if (nlh)
459 report = nlmsg_report(nlh);
460
461 return nlmsg_notify(rtnl, skb, pid, group, report, flags);
462 }
463
464 void rtnl_set_sk_err(u32 group, int error)
465 {
466 netlink_set_err(rtnl, 0, group, error);
467 }
468
469 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics)
470 {
471 struct nlattr *mx;
472 int i, valid = 0;
473
474 mx = nla_nest_start(skb, RTA_METRICS);
475 if (mx == NULL)
476 return -ENOBUFS;
477
478 for (i = 0; i < RTAX_MAX; i++) {
479 if (metrics[i]) {
480 valid++;
481 NLA_PUT_U32(skb, i+1, metrics[i]);
482 }
483 }
484
485 if (!valid) {
486 nla_nest_cancel(skb, mx);
487 return 0;
488 }
489
490 return nla_nest_end(skb, mx);
491
492 nla_put_failure:
493 return nla_nest_cancel(skb, mx);
494 }
495
496 int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id,
497 u32 ts, u32 tsage, long expires, u32 error)
498 {
499 struct rta_cacheinfo ci = {
500 .rta_lastuse = jiffies_to_clock_t(jiffies - dst->lastuse),
501 .rta_used = dst->__use,
502 .rta_clntref = atomic_read(&(dst->__refcnt)),
503 .rta_error = error,
504 .rta_id = id,
505 .rta_ts = ts,
506 .rta_tsage = tsage,
507 };
508
509 if (expires)
510 ci.rta_expires = jiffies_to_clock_t(expires);
511
512 return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci);
513 }
514
515 EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo);
516
517 static void set_operstate(struct net_device *dev, unsigned char transition)
518 {
519 unsigned char operstate = dev->operstate;
520
521 switch(transition) {
522 case IF_OPER_UP:
523 if ((operstate == IF_OPER_DORMANT ||
524 operstate == IF_OPER_UNKNOWN) &&
525 !netif_dormant(dev))
526 operstate = IF_OPER_UP;
527 break;
528
529 case IF_OPER_DORMANT:
530 if (operstate == IF_OPER_UP ||
531 operstate == IF_OPER_UNKNOWN)
532 operstate = IF_OPER_DORMANT;
533 break;
534 }
535
536 if (dev->operstate != operstate) {
537 write_lock_bh(&dev_base_lock);
538 dev->operstate = operstate;
539 write_unlock_bh(&dev_base_lock);
540 netdev_state_change(dev);
541 }
542 }
543
544 static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
545 struct net_device_stats *b)
546 {
547 a->rx_packets = b->rx_packets;
548 a->tx_packets = b->tx_packets;
549 a->rx_bytes = b->rx_bytes;
550 a->tx_bytes = b->tx_bytes;
551 a->rx_errors = b->rx_errors;
552 a->tx_errors = b->tx_errors;
553 a->rx_dropped = b->rx_dropped;
554 a->tx_dropped = b->tx_dropped;
555
556 a->multicast = b->multicast;
557 a->collisions = b->collisions;
558
559 a->rx_length_errors = b->rx_length_errors;
560 a->rx_over_errors = b->rx_over_errors;
561 a->rx_crc_errors = b->rx_crc_errors;
562 a->rx_frame_errors = b->rx_frame_errors;
563 a->rx_fifo_errors = b->rx_fifo_errors;
564 a->rx_missed_errors = b->rx_missed_errors;
565
566 a->tx_aborted_errors = b->tx_aborted_errors;
567 a->tx_carrier_errors = b->tx_carrier_errors;
568 a->tx_fifo_errors = b->tx_fifo_errors;
569 a->tx_heartbeat_errors = b->tx_heartbeat_errors;
570 a->tx_window_errors = b->tx_window_errors;
571
572 a->rx_compressed = b->rx_compressed;
573 a->tx_compressed = b->tx_compressed;
574 };
575
576 static inline size_t if_nlmsg_size(const struct net_device *dev)
577 {
578 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
579 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
580 + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */
581 + nla_total_size(sizeof(struct rtnl_link_ifmap))
582 + nla_total_size(sizeof(struct rtnl_link_stats))
583 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
584 + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */
585 + nla_total_size(4) /* IFLA_TXQLEN */
586 + nla_total_size(4) /* IFLA_WEIGHT */
587 + nla_total_size(4) /* IFLA_MTU */
588 + nla_total_size(4) /* IFLA_LINK */
589 + nla_total_size(4) /* IFLA_MASTER */
590 + nla_total_size(1) /* IFLA_OPERSTATE */
591 + nla_total_size(1) /* IFLA_LINKMODE */
592 + rtnl_link_get_size(dev); /* IFLA_LINKINFO */
593 }
594
595 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
596 int type, u32 pid, u32 seq, u32 change,
597 unsigned int flags)
598 {
599 struct ifinfomsg *ifm;
600 struct nlmsghdr *nlh;
601
602 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
603 if (nlh == NULL)
604 return -EMSGSIZE;
605
606 ifm = nlmsg_data(nlh);
607 ifm->ifi_family = AF_UNSPEC;
608 ifm->__ifi_pad = 0;
609 ifm->ifi_type = dev->type;
610 ifm->ifi_index = dev->ifindex;
611 ifm->ifi_flags = dev_get_flags(dev);
612 ifm->ifi_change = change;
613
614 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
615 NLA_PUT_U32(skb, IFLA_TXQLEN, dev->tx_queue_len);
616 NLA_PUT_U32(skb, IFLA_WEIGHT, dev->weight);
617 NLA_PUT_U8(skb, IFLA_OPERSTATE,
618 netif_running(dev) ? dev->operstate : IF_OPER_DOWN);
619 NLA_PUT_U8(skb, IFLA_LINKMODE, dev->link_mode);
620 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
621
622 if (dev->ifindex != dev->iflink)
623 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
624
625 if (dev->master)
626 NLA_PUT_U32(skb, IFLA_MASTER, dev->master->ifindex);
627
628 if (dev->qdisc_sleeping)
629 NLA_PUT_STRING(skb, IFLA_QDISC, dev->qdisc_sleeping->ops->id);
630
631 if (1) {
632 struct rtnl_link_ifmap map = {
633 .mem_start = dev->mem_start,
634 .mem_end = dev->mem_end,
635 .base_addr = dev->base_addr,
636 .irq = dev->irq,
637 .dma = dev->dma,
638 .port = dev->if_port,
639 };
640 NLA_PUT(skb, IFLA_MAP, sizeof(map), &map);
641 }
642
643 if (dev->addr_len) {
644 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
645 NLA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast);
646 }
647
648 if (dev->get_stats) {
649 struct net_device_stats *stats = dev->get_stats(dev);
650 if (stats) {
651 struct nlattr *attr;
652
653 attr = nla_reserve(skb, IFLA_STATS,
654 sizeof(struct rtnl_link_stats));
655 if (attr == NULL)
656 goto nla_put_failure;
657
658 copy_rtnl_link_stats(nla_data(attr), stats);
659 }
660 }
661
662 if (dev->rtnl_link_ops) {
663 if (rtnl_link_fill(skb, dev) < 0)
664 goto nla_put_failure;
665 }
666
667 return nlmsg_end(skb, nlh);
668
669 nla_put_failure:
670 nlmsg_cancel(skb, nlh);
671 return -EMSGSIZE;
672 }
673
674 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
675 {
676 int idx;
677 int s_idx = cb->args[0];
678 struct net_device *dev;
679
680 idx = 0;
681 for_each_netdev(dev) {
682 if (idx < s_idx)
683 goto cont;
684 if (rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK,
685 NETLINK_CB(cb->skb).pid,
686 cb->nlh->nlmsg_seq, 0, NLM_F_MULTI) <= 0)
687 break;
688 cont:
689 idx++;
690 }
691 cb->args[0] = idx;
692
693 return skb->len;
694 }
695
696 static const struct nla_policy ifla_policy[IFLA_MAX+1] = {
697 [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 },
698 [IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
699 [IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
700 [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) },
701 [IFLA_MTU] = { .type = NLA_U32 },
702 [IFLA_TXQLEN] = { .type = NLA_U32 },
703 [IFLA_WEIGHT] = { .type = NLA_U32 },
704 [IFLA_OPERSTATE] = { .type = NLA_U8 },
705 [IFLA_LINKMODE] = { .type = NLA_U8 },
706 };
707
708 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
709 [IFLA_INFO_KIND] = { .type = NLA_STRING },
710 [IFLA_INFO_DATA] = { .type = NLA_NESTED },
711 };
712
713 static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm,
714 struct nlattr **tb, char *ifname, int modified)
715 {
716 int send_addr_notify = 0;
717 int err;
718
719 if (tb[IFLA_MAP]) {
720 struct rtnl_link_ifmap *u_map;
721 struct ifmap k_map;
722
723 if (!dev->set_config) {
724 err = -EOPNOTSUPP;
725 goto errout;
726 }
727
728 if (!netif_device_present(dev)) {
729 err = -ENODEV;
730 goto errout;
731 }
732
733 u_map = nla_data(tb[IFLA_MAP]);
734 k_map.mem_start = (unsigned long) u_map->mem_start;
735 k_map.mem_end = (unsigned long) u_map->mem_end;
736 k_map.base_addr = (unsigned short) u_map->base_addr;
737 k_map.irq = (unsigned char) u_map->irq;
738 k_map.dma = (unsigned char) u_map->dma;
739 k_map.port = (unsigned char) u_map->port;
740
741 err = dev->set_config(dev, &k_map);
742 if (err < 0)
743 goto errout;
744
745 modified = 1;
746 }
747
748 if (tb[IFLA_ADDRESS]) {
749 struct sockaddr *sa;
750 int len;
751
752 if (!dev->set_mac_address) {
753 err = -EOPNOTSUPP;
754 goto errout;
755 }
756
757 if (!netif_device_present(dev)) {
758 err = -ENODEV;
759 goto errout;
760 }
761
762 len = sizeof(sa_family_t) + dev->addr_len;
763 sa = kmalloc(len, GFP_KERNEL);
764 if (!sa) {
765 err = -ENOMEM;
766 goto errout;
767 }
768 sa->sa_family = dev->type;
769 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
770 dev->addr_len);
771 err = dev->set_mac_address(dev, sa);
772 kfree(sa);
773 if (err)
774 goto errout;
775 send_addr_notify = 1;
776 modified = 1;
777 }
778
779 if (tb[IFLA_MTU]) {
780 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
781 if (err < 0)
782 goto errout;
783 modified = 1;
784 }
785
786 /*
787 * Interface selected by interface index but interface
788 * name provided implies that a name change has been
789 * requested.
790 */
791 if (ifm->ifi_index > 0 && ifname[0]) {
792 err = dev_change_name(dev, ifname);
793 if (err < 0)
794 goto errout;
795 modified = 1;
796 }
797
798 if (tb[IFLA_BROADCAST]) {
799 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
800 send_addr_notify = 1;
801 }
802
803
804 if (ifm->ifi_flags || ifm->ifi_change) {
805 unsigned int flags = ifm->ifi_flags;
806
807 /* bugwards compatibility: ifi_change == 0 is treated as ~0 */
808 if (ifm->ifi_change)
809 flags = (flags & ifm->ifi_change) |
810 (dev->flags & ~ifm->ifi_change);
811 dev_change_flags(dev, flags);
812 }
813
814 if (tb[IFLA_TXQLEN])
815 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
816
817 if (tb[IFLA_WEIGHT])
818 dev->weight = nla_get_u32(tb[IFLA_WEIGHT]);
819
820 if (tb[IFLA_OPERSTATE])
821 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
822
823 if (tb[IFLA_LINKMODE]) {
824 write_lock_bh(&dev_base_lock);
825 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
826 write_unlock_bh(&dev_base_lock);
827 }
828
829 err = 0;
830
831 errout:
832 if (err < 0 && modified && net_ratelimit())
833 printk(KERN_WARNING "A link change request failed with "
834 "some changes comitted already. Interface %s may "
835 "have been left with an inconsistent configuration, "
836 "please check.\n", dev->name);
837
838 if (send_addr_notify)
839 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
840 return err;
841 }
842
843 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
844 {
845 struct ifinfomsg *ifm;
846 struct net_device *dev;
847 int err;
848 struct nlattr *tb[IFLA_MAX+1];
849 char ifname[IFNAMSIZ];
850
851 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
852 if (err < 0)
853 goto errout;
854
855 if (tb[IFLA_IFNAME])
856 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
857 else
858 ifname[0] = '\0';
859
860 err = -EINVAL;
861 ifm = nlmsg_data(nlh);
862 if (ifm->ifi_index > 0)
863 dev = dev_get_by_index(ifm->ifi_index);
864 else if (tb[IFLA_IFNAME])
865 dev = dev_get_by_name(ifname);
866 else
867 goto errout;
868
869 if (dev == NULL) {
870 err = -ENODEV;
871 goto errout;
872 }
873
874 if (tb[IFLA_ADDRESS] &&
875 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
876 goto errout_dev;
877
878 if (tb[IFLA_BROADCAST] &&
879 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
880 goto errout_dev;
881
882 err = do_setlink(dev, ifm, tb, ifname, 0);
883 errout_dev:
884 dev_put(dev);
885 errout:
886 return err;
887 }
888
889 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
890 {
891 const struct rtnl_link_ops *ops;
892 struct net_device *dev;
893 struct ifinfomsg *ifm;
894 char ifname[IFNAMSIZ];
895 struct nlattr *tb[IFLA_MAX+1];
896 int err;
897
898 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
899 if (err < 0)
900 return err;
901
902 if (tb[IFLA_IFNAME])
903 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
904
905 ifm = nlmsg_data(nlh);
906 if (ifm->ifi_index > 0)
907 dev = __dev_get_by_index(ifm->ifi_index);
908 else if (tb[IFLA_IFNAME])
909 dev = __dev_get_by_name(ifname);
910 else
911 return -EINVAL;
912
913 if (!dev)
914 return -ENODEV;
915
916 ops = dev->rtnl_link_ops;
917 if (!ops)
918 return -EOPNOTSUPP;
919
920 ops->dellink(dev);
921 return 0;
922 }
923
924 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
925 {
926 const struct rtnl_link_ops *ops;
927 struct net_device *dev;
928 struct ifinfomsg *ifm;
929 char kind[MODULE_NAME_LEN];
930 char ifname[IFNAMSIZ];
931 struct nlattr *tb[IFLA_MAX+1];
932 struct nlattr *linkinfo[IFLA_INFO_MAX+1];
933 int err;
934
935 replay:
936 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
937 if (err < 0)
938 return err;
939
940 if (tb[IFLA_IFNAME])
941 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
942 else
943 ifname[0] = '\0';
944
945 ifm = nlmsg_data(nlh);
946 if (ifm->ifi_index > 0)
947 dev = __dev_get_by_index(ifm->ifi_index);
948 else if (ifname[0])
949 dev = __dev_get_by_name(ifname);
950 else
951 dev = NULL;
952
953 if (tb[IFLA_LINKINFO]) {
954 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX,
955 tb[IFLA_LINKINFO], ifla_info_policy);
956 if (err < 0)
957 return err;
958 } else
959 memset(linkinfo, 0, sizeof(linkinfo));
960
961 if (linkinfo[IFLA_INFO_KIND]) {
962 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind));
963 ops = rtnl_link_ops_get(kind);
964 } else {
965 kind[0] = '\0';
966 ops = NULL;
967 }
968
969 if (1) {
970 struct nlattr *attr[ops ? ops->maxtype + 1 : 0], **data = NULL;
971
972 if (ops) {
973 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
974 err = nla_parse_nested(attr, ops->maxtype,
975 linkinfo[IFLA_INFO_DATA],
976 ops->policy);
977 if (err < 0)
978 return err;
979 data = attr;
980 }
981 if (ops->validate) {
982 err = ops->validate(tb, data);
983 if (err < 0)
984 return err;
985 }
986 }
987
988 if (dev) {
989 int modified = 0;
990
991 if (nlh->nlmsg_flags & NLM_F_EXCL)
992 return -EEXIST;
993 if (nlh->nlmsg_flags & NLM_F_REPLACE)
994 return -EOPNOTSUPP;
995
996 if (linkinfo[IFLA_INFO_DATA]) {
997 if (!ops || ops != dev->rtnl_link_ops ||
998 !ops->changelink)
999 return -EOPNOTSUPP;
1000
1001 err = ops->changelink(dev, tb, data);
1002 if (err < 0)
1003 return err;
1004 modified = 1;
1005 }
1006
1007 return do_setlink(dev, ifm, tb, ifname, modified);
1008 }
1009
1010 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
1011 return -ENODEV;
1012
1013 if (ifm->ifi_index || ifm->ifi_flags || ifm->ifi_change)
1014 return -EOPNOTSUPP;
1015 if (tb[IFLA_ADDRESS] || tb[IFLA_BROADCAST] || tb[IFLA_MAP] ||
1016 tb[IFLA_MASTER] || tb[IFLA_PROTINFO])
1017 return -EOPNOTSUPP;
1018
1019 if (!ops) {
1020 #ifdef CONFIG_KMOD
1021 if (kind[0]) {
1022 __rtnl_unlock();
1023 request_module("rtnl-link-%s", kind);
1024 rtnl_lock();
1025 ops = rtnl_link_ops_get(kind);
1026 if (ops)
1027 goto replay;
1028 }
1029 #endif
1030 return -EOPNOTSUPP;
1031 }
1032
1033 if (!ifname[0])
1034 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
1035 dev = alloc_netdev(ops->priv_size, ifname, ops->setup);
1036 if (!dev)
1037 return -ENOMEM;
1038
1039 if (strchr(dev->name, '%')) {
1040 err = dev_alloc_name(dev, dev->name);
1041 if (err < 0)
1042 goto err_free;
1043 }
1044 dev->rtnl_link_ops = ops;
1045
1046 if (tb[IFLA_MTU])
1047 dev->mtu = nla_get_u32(tb[IFLA_MTU]);
1048 if (tb[IFLA_TXQLEN])
1049 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
1050 if (tb[IFLA_WEIGHT])
1051 dev->weight = nla_get_u32(tb[IFLA_WEIGHT]);
1052 if (tb[IFLA_OPERSTATE])
1053 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
1054 if (tb[IFLA_LINKMODE])
1055 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
1056
1057 err = ops->newlink(dev, tb, data);
1058 err_free:
1059 if (err < 0)
1060 free_netdev(dev);
1061 return err;
1062 }
1063 }
1064
1065 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
1066 {
1067 struct ifinfomsg *ifm;
1068 struct nlattr *tb[IFLA_MAX+1];
1069 struct net_device *dev = NULL;
1070 struct sk_buff *nskb;
1071 int err;
1072
1073 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1074 if (err < 0)
1075 return err;
1076
1077 ifm = nlmsg_data(nlh);
1078 if (ifm->ifi_index > 0) {
1079 dev = dev_get_by_index(ifm->ifi_index);
1080 if (dev == NULL)
1081 return -ENODEV;
1082 } else
1083 return -EINVAL;
1084
1085 nskb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL);
1086 if (nskb == NULL) {
1087 err = -ENOBUFS;
1088 goto errout;
1089 }
1090
1091 err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).pid,
1092 nlh->nlmsg_seq, 0, 0);
1093 if (err < 0) {
1094 /* -EMSGSIZE implies BUG in if_nlmsg_size */
1095 WARN_ON(err == -EMSGSIZE);
1096 kfree_skb(nskb);
1097 goto errout;
1098 }
1099 err = rtnl_unicast(nskb, NETLINK_CB(skb).pid);
1100 errout:
1101 dev_put(dev);
1102
1103 return err;
1104 }
1105
1106 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
1107 {
1108 int idx;
1109 int s_idx = cb->family;
1110
1111 if (s_idx == 0)
1112 s_idx = 1;
1113 for (idx=1; idx<NPROTO; idx++) {
1114 int type = cb->nlh->nlmsg_type-RTM_BASE;
1115 if (idx < s_idx || idx == PF_PACKET)
1116 continue;
1117 if (rtnl_msg_handlers[idx] == NULL ||
1118 rtnl_msg_handlers[idx][type].dumpit == NULL)
1119 continue;
1120 if (idx > s_idx)
1121 memset(&cb->args[0], 0, sizeof(cb->args));
1122 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb))
1123 break;
1124 }
1125 cb->family = idx;
1126
1127 return skb->len;
1128 }
1129
1130 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change)
1131 {
1132 struct sk_buff *skb;
1133 int err = -ENOBUFS;
1134
1135 skb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL);
1136 if (skb == NULL)
1137 goto errout;
1138
1139 err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0);
1140 if (err < 0) {
1141 /* -EMSGSIZE implies BUG in if_nlmsg_size() */
1142 WARN_ON(err == -EMSGSIZE);
1143 kfree_skb(skb);
1144 goto errout;
1145 }
1146 err = rtnl_notify(skb, 0, RTNLGRP_LINK, NULL, GFP_KERNEL);
1147 errout:
1148 if (err < 0)
1149 rtnl_set_sk_err(RTNLGRP_LINK, err);
1150 }
1151
1152 /* Protected by RTNL sempahore. */
1153 static struct rtattr **rta_buf;
1154 static int rtattr_max;
1155
1156 /* Process one rtnetlink message. */
1157
1158 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
1159 {
1160 rtnl_doit_func doit;
1161 int sz_idx, kind;
1162 int min_len;
1163 int family;
1164 int type;
1165 int err;
1166
1167 type = nlh->nlmsg_type;
1168 if (type > RTM_MAX)
1169 return -EOPNOTSUPP;
1170
1171 type -= RTM_BASE;
1172
1173 /* All the messages must have at least 1 byte length */
1174 if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg)))
1175 return 0;
1176
1177 family = ((struct rtgenmsg*)NLMSG_DATA(nlh))->rtgen_family;
1178 if (family >= NPROTO)
1179 return -EAFNOSUPPORT;
1180
1181 sz_idx = type>>2;
1182 kind = type&3;
1183
1184 if (kind != 2 && security_netlink_recv(skb, CAP_NET_ADMIN))
1185 return -EPERM;
1186
1187 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
1188 rtnl_dumpit_func dumpit;
1189
1190 dumpit = rtnl_get_dumpit(family, type);
1191 if (dumpit == NULL)
1192 return -EOPNOTSUPP;
1193
1194 __rtnl_unlock();
1195 err = netlink_dump_start(rtnl, skb, nlh, dumpit, NULL);
1196 rtnl_lock();
1197 return err;
1198 }
1199
1200 memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *)));
1201
1202 min_len = rtm_min[sz_idx];
1203 if (nlh->nlmsg_len < min_len)
1204 return -EINVAL;
1205
1206 if (nlh->nlmsg_len > min_len) {
1207 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
1208 struct rtattr *attr = (void*)nlh + NLMSG_ALIGN(min_len);
1209
1210 while (RTA_OK(attr, attrlen)) {
1211 unsigned flavor = attr->rta_type;
1212 if (flavor) {
1213 if (flavor > rta_max[sz_idx])
1214 return -EINVAL;
1215 rta_buf[flavor-1] = attr;
1216 }
1217 attr = RTA_NEXT(attr, attrlen);
1218 }
1219 }
1220
1221 doit = rtnl_get_doit(family, type);
1222 if (doit == NULL)
1223 return -EOPNOTSUPP;
1224
1225 return doit(skb, nlh, (void *)&rta_buf[0]);
1226 }
1227
1228 static void rtnetlink_rcv(struct sk_buff *skb)
1229 {
1230 rtnl_lock();
1231 netlink_rcv_skb(skb, &rtnetlink_rcv_msg);
1232 rtnl_unlock();
1233 }
1234
1235 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
1236 {
1237 struct net_device *dev = ptr;
1238 switch (event) {
1239 case NETDEV_UNREGISTER:
1240 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);
1241 break;
1242 case NETDEV_REGISTER:
1243 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
1244 break;
1245 case NETDEV_UP:
1246 case NETDEV_DOWN:
1247 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
1248 break;
1249 case NETDEV_CHANGE:
1250 case NETDEV_GOING_DOWN:
1251 break;
1252 default:
1253 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
1254 break;
1255 }
1256 return NOTIFY_DONE;
1257 }
1258
1259 static struct notifier_block rtnetlink_dev_notifier = {
1260 .notifier_call = rtnetlink_event,
1261 };
1262
1263 void __init rtnetlink_init(void)
1264 {
1265 int i;
1266
1267 rtattr_max = 0;
1268 for (i = 0; i < ARRAY_SIZE(rta_max); i++)
1269 if (rta_max[i] > rtattr_max)
1270 rtattr_max = rta_max[i];
1271 rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL);
1272 if (!rta_buf)
1273 panic("rtnetlink_init: cannot allocate rta_buf\n");
1274
1275 rtnl = netlink_kernel_create(NETLINK_ROUTE, RTNLGRP_MAX, rtnetlink_rcv,
1276 &rtnl_mutex, THIS_MODULE);
1277 if (rtnl == NULL)
1278 panic("rtnetlink_init: cannot initialize rtnetlink\n");
1279 netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV);
1280 register_netdevice_notifier(&rtnetlink_dev_notifier);
1281
1282 rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink, rtnl_dump_ifinfo);
1283 rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL);
1284 rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL);
1285 rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL);
1286
1287 rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all);
1288 rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all);
1289 }
1290
1291 EXPORT_SYMBOL(__rta_fill);
1292 EXPORT_SYMBOL(rtattr_strlcpy);
1293 EXPORT_SYMBOL(rtattr_parse);
1294 EXPORT_SYMBOL(rtnetlink_put_metrics);
1295 EXPORT_SYMBOL(rtnl_lock);
1296 EXPORT_SYMBOL(rtnl_trylock);
1297 EXPORT_SYMBOL(rtnl_unlock);
1298 EXPORT_SYMBOL(rtnl_unicast);
1299 EXPORT_SYMBOL(rtnl_notify);
1300 EXPORT_SYMBOL(rtnl_set_sk_err);
Tomato firmware and modifications.