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[RTNETLINK]: Add rtnl_put_cacheinfo() to unify some code
[linux-2.6/x86.git] / net / core / rtnetlink.c
blobe76539a5eb5e09e79939fef2e4d96bd9449c1a7b
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/sched.h>
25 #include <linux/timer.h>
26 #include <linux/string.h>
27 #include <linux/sockios.h>
28 #include <linux/net.h>
29 #include <linux/fcntl.h>
30 #include <linux/mm.h>
31 #include <linux/slab.h>
32 #include <linux/interrupt.h>
33 #include <linux/capability.h>
34 #include <linux/skbuff.h>
35 #include <linux/init.h>
36 #include <linux/security.h>
37 #include <linux/mutex.h>
38 #include <linux/if_addr.h>
39
40 #include <asm/uaccess.h>
41 #include <asm/system.h>
42 #include <asm/string.h>
43
44 #include <linux/inet.h>
45 #include <linux/netdevice.h>
46 #include <net/ip.h>
47 #include <net/protocol.h>
48 #include <net/arp.h>
49 #include <net/route.h>
50 #include <net/udp.h>
51 #include <net/sock.h>
52 #include <net/pkt_sched.h>
53 #include <net/fib_rules.h>
54 #include <net/netlink.h>
55 #ifdef CONFIG_NET_WIRELESS_RTNETLINK
56 #include <linux/wireless.h>
57 #include <net/iw_handler.h>
58 #endif /* CONFIG_NET_WIRELESS_RTNETLINK */
59
60 static DEFINE_MUTEX(rtnl_mutex);
61 static struct sock *rtnl;
62
63 void rtnl_lock(void)
64 {
65 mutex_lock(&rtnl_mutex);
66 }
67
68 void __rtnl_unlock(void)
69 {
70 mutex_unlock(&rtnl_mutex);
71 }
72
73 void rtnl_unlock(void)
74 {
75 mutex_unlock(&rtnl_mutex);
76 if (rtnl && rtnl->sk_receive_queue.qlen)
77 rtnl->sk_data_ready(rtnl, 0);
78 netdev_run_todo();
79 }
80
81 int rtnl_trylock(void)
82 {
83 return mutex_trylock(&rtnl_mutex);
84 }
85
86 int rtattr_parse(struct rtattr *tb[], int maxattr, struct rtattr *rta, int len)
87 {
88 memset(tb, 0, sizeof(struct rtattr*)*maxattr);
89
90 while (RTA_OK(rta, len)) {
91 unsigned flavor = rta->rta_type;
92 if (flavor && flavor <= maxattr)
93 tb[flavor-1] = rta;
94 rta = RTA_NEXT(rta, len);
95 }
96 return 0;
97 }
98
99 struct rtnetlink_link * rtnetlink_links[NPROTO];
100
101 static const int rtm_min[RTM_NR_FAMILIES] =
102 {
103 [RTM_FAM(RTM_NEWLINK)] = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
104 [RTM_FAM(RTM_NEWADDR)] = NLMSG_LENGTH(sizeof(struct ifaddrmsg)),
105 [RTM_FAM(RTM_NEWROUTE)] = NLMSG_LENGTH(sizeof(struct rtmsg)),
106 [RTM_FAM(RTM_NEWRULE)] = NLMSG_LENGTH(sizeof(struct fib_rule_hdr)),
107 [RTM_FAM(RTM_NEWQDISC)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
108 [RTM_FAM(RTM_NEWTCLASS)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
109 [RTM_FAM(RTM_NEWTFILTER)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
110 [RTM_FAM(RTM_NEWACTION)] = NLMSG_LENGTH(sizeof(struct tcamsg)),
111 [RTM_FAM(RTM_GETMULTICAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
112 [RTM_FAM(RTM_GETANYCAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
113 };
114
115 static const int rta_max[RTM_NR_FAMILIES] =
116 {
117 [RTM_FAM(RTM_NEWLINK)] = IFLA_MAX,
118 [RTM_FAM(RTM_NEWADDR)] = IFA_MAX,
119 [RTM_FAM(RTM_NEWROUTE)] = RTA_MAX,
120 [RTM_FAM(RTM_NEWRULE)] = FRA_MAX,
121 [RTM_FAM(RTM_NEWQDISC)] = TCA_MAX,
122 [RTM_FAM(RTM_NEWTCLASS)] = TCA_MAX,
123 [RTM_FAM(RTM_NEWTFILTER)] = TCA_MAX,
124 [RTM_FAM(RTM_NEWACTION)] = TCAA_MAX,
125 };
126
127 void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const void *data)
128 {
129 struct rtattr *rta;
130 int size = RTA_LENGTH(attrlen);
131
132 rta = (struct rtattr*)skb_put(skb, RTA_ALIGN(size));
133 rta->rta_type = attrtype;
134 rta->rta_len = size;
135 memcpy(RTA_DATA(rta), data, attrlen);
136 memset(RTA_DATA(rta) + attrlen, 0, RTA_ALIGN(size) - size);
137 }
138
139 size_t rtattr_strlcpy(char *dest, const struct rtattr *rta, size_t size)
140 {
141 size_t ret = RTA_PAYLOAD(rta);
142 char *src = RTA_DATA(rta);
143
144 if (ret > 0 && src[ret - 1] == '\0')
145 ret--;
146 if (size > 0) {
147 size_t len = (ret >= size) ? size - 1 : ret;
148 memset(dest, 0, size);
149 memcpy(dest, src, len);
150 }
151 return ret;
152 }
153
154 int rtnetlink_send(struct sk_buff *skb, u32 pid, unsigned group, int echo)
155 {
156 int err = 0;
157
158 NETLINK_CB(skb).dst_group = group;
159 if (echo)
160 atomic_inc(&skb->users);
161 netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL);
162 if (echo)
163 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
164 return err;
165 }
166
167 int rtnl_unicast(struct sk_buff *skb, u32 pid)
168 {
169 return nlmsg_unicast(rtnl, skb, pid);
170 }
171
172 int rtnl_notify(struct sk_buff *skb, u32 pid, u32 group,
173 struct nlmsghdr *nlh, gfp_t flags)
174 {
175 int report = 0;
176
177 if (nlh)
178 report = nlmsg_report(nlh);
179
180 return nlmsg_notify(rtnl, skb, pid, group, report, flags);
181 }
182
183 void rtnl_set_sk_err(u32 group, int error)
184 {
185 netlink_set_err(rtnl, 0, group, error);
186 }
187
188 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics)
189 {
190 struct nlattr *mx;
191 int i, valid = 0;
192
193 mx = nla_nest_start(skb, RTA_METRICS);
194 if (mx == NULL)
195 return -ENOBUFS;
196
197 for (i = 0; i < RTAX_MAX; i++) {
198 if (metrics[i]) {
199 valid++;
200 NLA_PUT_U32(skb, i+1, metrics[i]);
201 }
202 }
203
204 if (!valid) {
205 nla_nest_cancel(skb, mx);
206 return 0;
207 }
208
209 return nla_nest_end(skb, mx);
210
211 nla_put_failure:
212 return nla_nest_cancel(skb, mx);
213 }
214
215 int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id,
216 u32 ts, u32 tsage, long expires, u32 error)
217 {
218 struct rta_cacheinfo ci = {
219 .rta_lastuse = jiffies_to_clock_t(jiffies - dst->lastuse),
220 .rta_used = dst->__use,
221 .rta_clntref = atomic_read(&(dst->__refcnt)),
222 .rta_error = error,
223 .rta_id = id,
224 .rta_ts = ts,
225 .rta_tsage = tsage,
226 };
227
228 if (expires)
229 ci.rta_expires = jiffies_to_clock_t(expires);
230
231 return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci);
232 }
233
234 EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo);
235
236 static void set_operstate(struct net_device *dev, unsigned char transition)
237 {
238 unsigned char operstate = dev->operstate;
239
240 switch(transition) {
241 case IF_OPER_UP:
242 if ((operstate == IF_OPER_DORMANT ||
243 operstate == IF_OPER_UNKNOWN) &&
244 !netif_dormant(dev))
245 operstate = IF_OPER_UP;
246 break;
247
248 case IF_OPER_DORMANT:
249 if (operstate == IF_OPER_UP ||
250 operstate == IF_OPER_UNKNOWN)
251 operstate = IF_OPER_DORMANT;
252 break;
253 };
254
255 if (dev->operstate != operstate) {
256 write_lock_bh(&dev_base_lock);
257 dev->operstate = operstate;
258 write_unlock_bh(&dev_base_lock);
259 netdev_state_change(dev);
260 }
261 }
262
263 static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
264 struct net_device_stats *b)
265 {
266 a->rx_packets = b->rx_packets;
267 a->tx_packets = b->tx_packets;
268 a->rx_bytes = b->rx_bytes;
269 a->tx_bytes = b->tx_bytes;
270 a->rx_errors = b->rx_errors;
271 a->tx_errors = b->tx_errors;
272 a->rx_dropped = b->rx_dropped;
273 a->tx_dropped = b->tx_dropped;
274
275 a->multicast = b->multicast;
276 a->collisions = b->collisions;
277
278 a->rx_length_errors = b->rx_length_errors;
279 a->rx_over_errors = b->rx_over_errors;
280 a->rx_crc_errors = b->rx_crc_errors;
281 a->rx_frame_errors = b->rx_frame_errors;
282 a->rx_fifo_errors = b->rx_fifo_errors;
283 a->rx_missed_errors = b->rx_missed_errors;
284
285 a->tx_aborted_errors = b->tx_aborted_errors;
286 a->tx_carrier_errors = b->tx_carrier_errors;
287 a->tx_fifo_errors = b->tx_fifo_errors;
288 a->tx_heartbeat_errors = b->tx_heartbeat_errors;
289 a->tx_window_errors = b->tx_window_errors;
290
291 a->rx_compressed = b->rx_compressed;
292 a->tx_compressed = b->tx_compressed;
293 };
294
295 static inline size_t if_nlmsg_size(int iwbuflen)
296 {
297 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
298 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
299 + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */
300 + nla_total_size(sizeof(struct rtnl_link_ifmap))
301 + nla_total_size(sizeof(struct rtnl_link_stats))
302 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
303 + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */
304 + nla_total_size(4) /* IFLA_TXQLEN */
305 + nla_total_size(4) /* IFLA_WEIGHT */
306 + nla_total_size(4) /* IFLA_MTU */
307 + nla_total_size(4) /* IFLA_LINK */
308 + nla_total_size(4) /* IFLA_MASTER */
309 + nla_total_size(1) /* IFLA_OPERSTATE */
310 + nla_total_size(1) /* IFLA_LINKMODE */
311 + nla_total_size(iwbuflen);
312 }
313
314 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
315 void *iwbuf, int iwbuflen, int type, u32 pid,
316 u32 seq, u32 change, unsigned int flags)
317 {
318 struct ifinfomsg *ifm;
319 struct nlmsghdr *nlh;
320
321 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
322 if (nlh == NULL)
323 return -ENOBUFS;
324
325 ifm = nlmsg_data(nlh);
326 ifm->ifi_family = AF_UNSPEC;
327 ifm->__ifi_pad = 0;
328 ifm->ifi_type = dev->type;
329 ifm->ifi_index = dev->ifindex;
330 ifm->ifi_flags = dev_get_flags(dev);
331 ifm->ifi_change = change;
332
333 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
334 NLA_PUT_U32(skb, IFLA_TXQLEN, dev->tx_queue_len);
335 NLA_PUT_U32(skb, IFLA_WEIGHT, dev->weight);
336 NLA_PUT_U8(skb, IFLA_OPERSTATE,
337 netif_running(dev) ? dev->operstate : IF_OPER_DOWN);
338 NLA_PUT_U8(skb, IFLA_LINKMODE, dev->link_mode);
339 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
340
341 if (dev->ifindex != dev->iflink)
342 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
343
344 if (dev->master)
345 NLA_PUT_U32(skb, IFLA_MASTER, dev->master->ifindex);
346
347 if (dev->qdisc_sleeping)
348 NLA_PUT_STRING(skb, IFLA_QDISC, dev->qdisc_sleeping->ops->id);
349
350 if (1) {
351 struct rtnl_link_ifmap map = {
352 .mem_start = dev->mem_start,
353 .mem_end = dev->mem_end,
354 .base_addr = dev->base_addr,
355 .irq = dev->irq,
356 .dma = dev->dma,
357 .port = dev->if_port,
358 };
359 NLA_PUT(skb, IFLA_MAP, sizeof(map), &map);
360 }
361
362 if (dev->addr_len) {
363 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
364 NLA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast);
365 }
366
367 if (dev->get_stats) {
368 struct net_device_stats *stats = dev->get_stats(dev);
369 if (stats) {
370 struct nlattr *attr;
371
372 attr = nla_reserve(skb, IFLA_STATS,
373 sizeof(struct rtnl_link_stats));
374 if (attr == NULL)
375 goto nla_put_failure;
376
377 copy_rtnl_link_stats(nla_data(attr), stats);
378 }
379 }
380
381 if (iwbuf)
382 NLA_PUT(skb, IFLA_WIRELESS, iwbuflen, iwbuf);
383
384 return nlmsg_end(skb, nlh);
385
386 nla_put_failure:
387 return nlmsg_cancel(skb, nlh);
388 }
389
390 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
391 {
392 int idx;
393 int s_idx = cb->args[0];
394 struct net_device *dev;
395
396 read_lock(&dev_base_lock);
397 for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) {
398 if (idx < s_idx)
399 continue;
400 if (rtnl_fill_ifinfo(skb, dev, NULL, 0, RTM_NEWLINK,
401 NETLINK_CB(cb->skb).pid,
402 cb->nlh->nlmsg_seq, 0, NLM_F_MULTI) <= 0)
403 break;
404 }
405 read_unlock(&dev_base_lock);
406 cb->args[0] = idx;
407
408 return skb->len;
409 }
410
411 static struct nla_policy ifla_policy[IFLA_MAX+1] __read_mostly = {
412 [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 },
413 [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) },
414 [IFLA_MTU] = { .type = NLA_U32 },
415 [IFLA_TXQLEN] = { .type = NLA_U32 },
416 [IFLA_WEIGHT] = { .type = NLA_U32 },
417 [IFLA_OPERSTATE] = { .type = NLA_U8 },
418 [IFLA_LINKMODE] = { .type = NLA_U8 },
419 };
420
421 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
422 {
423 struct ifinfomsg *ifm;
424 struct net_device *dev;
425 int err, send_addr_notify = 0, modified = 0;
426 struct nlattr *tb[IFLA_MAX+1];
427 char ifname[IFNAMSIZ];
428
429 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
430 if (err < 0)
431 goto errout;
432
433 if (tb[IFLA_IFNAME])
434 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
435 else
436 ifname[0] = '\0';
437
438 err = -EINVAL;
439 ifm = nlmsg_data(nlh);
440 if (ifm->ifi_index >= 0)
441 dev = dev_get_by_index(ifm->ifi_index);
442 else if (tb[IFLA_IFNAME])
443 dev = dev_get_by_name(ifname);
444 else
445 goto errout;
446
447 if (dev == NULL) {
448 err = -ENODEV;
449 goto errout;
450 }
451
452 if (tb[IFLA_ADDRESS] &&
453 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
454 goto errout_dev;
455
456 if (tb[IFLA_BROADCAST] &&
457 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
458 goto errout_dev;
459
460 if (tb[IFLA_MAP]) {
461 struct rtnl_link_ifmap *u_map;
462 struct ifmap k_map;
463
464 if (!dev->set_config) {
465 err = -EOPNOTSUPP;
466 goto errout_dev;
467 }
468
469 if (!netif_device_present(dev)) {
470 err = -ENODEV;
471 goto errout_dev;
472 }
473
474 u_map = nla_data(tb[IFLA_MAP]);
475 k_map.mem_start = (unsigned long) u_map->mem_start;
476 k_map.mem_end = (unsigned long) u_map->mem_end;
477 k_map.base_addr = (unsigned short) u_map->base_addr;
478 k_map.irq = (unsigned char) u_map->irq;
479 k_map.dma = (unsigned char) u_map->dma;
480 k_map.port = (unsigned char) u_map->port;
481
482 err = dev->set_config(dev, &k_map);
483 if (err < 0)
484 goto errout_dev;
485
486 modified = 1;
487 }
488
489 if (tb[IFLA_ADDRESS]) {
490 struct sockaddr *sa;
491 int len;
492
493 if (!dev->set_mac_address) {
494 err = -EOPNOTSUPP;
495 goto errout_dev;
496 }
497
498 if (!netif_device_present(dev)) {
499 err = -ENODEV;
500 goto errout_dev;
501 }
502
503 len = sizeof(sa_family_t) + dev->addr_len;
504 sa = kmalloc(len, GFP_KERNEL);
505 if (!sa) {
506 err = -ENOMEM;
507 goto errout_dev;
508 }
509 sa->sa_family = dev->type;
510 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
511 dev->addr_len);
512 err = dev->set_mac_address(dev, sa);
513 kfree(sa);
514 if (err)
515 goto errout_dev;
516 send_addr_notify = 1;
517 modified = 1;
518 }
519
520 if (tb[IFLA_MTU]) {
521 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
522 if (err < 0)
523 goto errout_dev;
524 modified = 1;
525 }
526
527 /*
528 * Interface selected by interface index but interface
529 * name provided implies that a name change has been
530 * requested.
531 */
532 if (ifm->ifi_index >= 0 && ifname[0]) {
533 err = dev_change_name(dev, ifname);
534 if (err < 0)
535 goto errout_dev;
536 modified = 1;
537 }
538
539 #ifdef CONFIG_NET_WIRELESS_RTNETLINK
540 if (tb[IFLA_WIRELESS]) {
541 /* Call Wireless Extensions.
542 * Various stuff checked in there... */
543 err = wireless_rtnetlink_set(dev, nla_data(tb[IFLA_WIRELESS]),
544 nla_len(tb[IFLA_WIRELESS]));
545 if (err < 0)
546 goto errout_dev;
547 }
548 #endif /* CONFIG_NET_WIRELESS_RTNETLINK */
549
550 if (tb[IFLA_BROADCAST]) {
551 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
552 send_addr_notify = 1;
553 }
554
555
556 if (ifm->ifi_flags)
557 dev_change_flags(dev, ifm->ifi_flags);
558
559 if (tb[IFLA_TXQLEN])
560 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
561
562 if (tb[IFLA_WEIGHT])
563 dev->weight = nla_get_u32(tb[IFLA_WEIGHT]);
564
565 if (tb[IFLA_OPERSTATE])
566 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
567
568 if (tb[IFLA_LINKMODE]) {
569 write_lock_bh(&dev_base_lock);
570 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
571 write_unlock_bh(&dev_base_lock);
572 }
573
574 err = 0;
575
576 errout_dev:
577 if (err < 0 && modified && net_ratelimit())
578 printk(KERN_WARNING "A link change request failed with "
579 "some changes comitted already. Interface %s may "
580 "have been left with an inconsistent configuration, "
581 "please check.\n", dev->name);
582
583 if (send_addr_notify)
584 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
585
586 dev_put(dev);
587 errout:
588 return err;
589 }
590
591 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
592 {
593 struct ifinfomsg *ifm;
594 struct nlattr *tb[IFLA_MAX+1];
595 struct net_device *dev = NULL;
596 struct sk_buff *nskb;
597 char *iw_buf = NULL, *iw = NULL;
598 int iw_buf_len = 0;
599 int err;
600
601 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
602 if (err < 0)
603 return err;
604
605 ifm = nlmsg_data(nlh);
606 if (ifm->ifi_index >= 0) {
607 dev = dev_get_by_index(ifm->ifi_index);
608 if (dev == NULL)
609 return -ENODEV;
610 } else
611 return -EINVAL;
612
613
614 #ifdef CONFIG_NET_WIRELESS_RTNETLINK
615 if (tb[IFLA_WIRELESS]) {
616 /* Call Wireless Extensions. We need to know the size before
617 * we can alloc. Various stuff checked in there... */
618 err = wireless_rtnetlink_get(dev, nla_data(tb[IFLA_WIRELESS]),
619 nla_len(tb[IFLA_WIRELESS]),
620 &iw_buf, &iw_buf_len);
621 if (err < 0)
622 goto errout;
623
624 iw += IW_EV_POINT_OFF;
625 }
626 #endif /* CONFIG_NET_WIRELESS_RTNETLINK */
627
628 nskb = nlmsg_new(if_nlmsg_size(iw_buf_len), GFP_KERNEL);
629 if (nskb == NULL) {
630 err = -ENOBUFS;
631 goto errout;
632 }
633
634 err = rtnl_fill_ifinfo(nskb, dev, iw, iw_buf_len, RTM_NEWLINK,
635 NETLINK_CB(skb).pid, nlh->nlmsg_seq, 0, 0);
636 /* failure impilies BUG in if_nlmsg_size or wireless_rtnetlink_get */
637 BUG_ON(err < 0);
638
639 err = rtnl_unicast(nskb, NETLINK_CB(skb).pid);
640 errout:
641 kfree(iw_buf);
642 dev_put(dev);
643
644 return err;
645 }
646
647 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
648 {
649 int idx;
650 int s_idx = cb->family;
651
652 if (s_idx == 0)
653 s_idx = 1;
654 for (idx=1; idx<NPROTO; idx++) {
655 int type = cb->nlh->nlmsg_type-RTM_BASE;
656 if (idx < s_idx || idx == PF_PACKET)
657 continue;
658 if (rtnetlink_links[idx] == NULL ||
659 rtnetlink_links[idx][type].dumpit == NULL)
660 continue;
661 if (idx > s_idx)
662 memset(&cb->args[0], 0, sizeof(cb->args));
663 if (rtnetlink_links[idx][type].dumpit(skb, cb))
664 break;
665 }
666 cb->family = idx;
667
668 return skb->len;
669 }
670
671 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change)
672 {
673 struct sk_buff *skb;
674 int err = -ENOBUFS;
675
676 skb = nlmsg_new(if_nlmsg_size(0), GFP_KERNEL);
677 if (skb == NULL)
678 goto errout;
679
680 err = rtnl_fill_ifinfo(skb, dev, NULL, 0, type, 0, 0, change, 0);
681 /* failure implies BUG in if_nlmsg_size() */
682 BUG_ON(err < 0);
683
684 err = rtnl_notify(skb, 0, RTNLGRP_LINK, NULL, GFP_KERNEL);
685 errout:
686 if (err < 0)
687 rtnl_set_sk_err(RTNLGRP_LINK, err);
688 }
689
690 /* Protected by RTNL sempahore. */
691 static struct rtattr **rta_buf;
692 static int rtattr_max;
693
694 /* Process one rtnetlink message. */
695
696 static __inline__ int
697 rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, int *errp)
698 {
699 struct rtnetlink_link *link;
700 struct rtnetlink_link *link_tab;
701 int sz_idx, kind;
702 int min_len;
703 int family;
704 int type;
705 int err;
706
707 /* Only requests are handled by kernel now */
708 if (!(nlh->nlmsg_flags&NLM_F_REQUEST))
709 return 0;
710
711 type = nlh->nlmsg_type;
712
713 /* A control message: ignore them */
714 if (type < RTM_BASE)
715 return 0;
716
717 /* Unknown message: reply with EINVAL */
718 if (type > RTM_MAX)
719 goto err_inval;
720
721 type -= RTM_BASE;
722
723 /* All the messages must have at least 1 byte length */
724 if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg)))
725 return 0;
726
727 family = ((struct rtgenmsg*)NLMSG_DATA(nlh))->rtgen_family;
728 if (family >= NPROTO) {
729 *errp = -EAFNOSUPPORT;
730 return -1;
731 }
732
733 link_tab = rtnetlink_links[family];
734 if (link_tab == NULL)
735 link_tab = rtnetlink_links[PF_UNSPEC];
736 link = &link_tab[type];
737
738 sz_idx = type>>2;
739 kind = type&3;
740
741 if (kind != 2 && security_netlink_recv(skb, CAP_NET_ADMIN)) {
742 *errp = -EPERM;
743 return -1;
744 }
745
746 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
747 if (link->dumpit == NULL)
748 link = &(rtnetlink_links[PF_UNSPEC][type]);
749
750 if (link->dumpit == NULL)
751 goto err_inval;
752
753 if ((*errp = netlink_dump_start(rtnl, skb, nlh,
754 link->dumpit, NULL)) != 0) {
755 return -1;
756 }
757
758 netlink_queue_skip(nlh, skb);
759 return -1;
760 }
761
762 memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *)));
763
764 min_len = rtm_min[sz_idx];
765 if (nlh->nlmsg_len < min_len)
766 goto err_inval;
767
768 if (nlh->nlmsg_len > min_len) {
769 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
770 struct rtattr *attr = (void*)nlh + NLMSG_ALIGN(min_len);
771
772 while (RTA_OK(attr, attrlen)) {
773 unsigned flavor = attr->rta_type;
774 if (flavor) {
775 if (flavor > rta_max[sz_idx])
776 goto err_inval;
777 rta_buf[flavor-1] = attr;
778 }
779 attr = RTA_NEXT(attr, attrlen);
780 }
781 }
782
783 if (link->doit == NULL)
784 link = &(rtnetlink_links[PF_UNSPEC][type]);
785 if (link->doit == NULL)
786 goto err_inval;
787 err = link->doit(skb, nlh, (void *)&rta_buf[0]);
788
789 *errp = err;
790 return err;
791
792 err_inval:
793 *errp = -EINVAL;
794 return -1;
795 }
796
797 static void rtnetlink_rcv(struct sock *sk, int len)
798 {
799 unsigned int qlen = 0;
800
801 do {
802 mutex_lock(&rtnl_mutex);
803 netlink_run_queue(sk, &qlen, &rtnetlink_rcv_msg);
804 mutex_unlock(&rtnl_mutex);
805
806 netdev_run_todo();
807 } while (qlen);
808 }
809
810 static struct rtnetlink_link link_rtnetlink_table[RTM_NR_MSGTYPES] =
811 {
812 [RTM_GETLINK - RTM_BASE] = { .doit = rtnl_getlink,
813 .dumpit = rtnl_dump_ifinfo },
814 [RTM_SETLINK - RTM_BASE] = { .doit = rtnl_setlink },
815 [RTM_GETADDR - RTM_BASE] = { .dumpit = rtnl_dump_all },
816 [RTM_GETROUTE - RTM_BASE] = { .dumpit = rtnl_dump_all },
817 [RTM_NEWNEIGH - RTM_BASE] = { .doit = neigh_add },
818 [RTM_DELNEIGH - RTM_BASE] = { .doit = neigh_delete },
819 [RTM_GETNEIGH - RTM_BASE] = { .dumpit = neigh_dump_info },
820 #ifdef CONFIG_FIB_RULES
821 [RTM_NEWRULE - RTM_BASE] = { .doit = fib_nl_newrule },
822 [RTM_DELRULE - RTM_BASE] = { .doit = fib_nl_delrule },
823 #endif
824 [RTM_GETRULE - RTM_BASE] = { .dumpit = rtnl_dump_all },
825 [RTM_GETNEIGHTBL - RTM_BASE] = { .dumpit = neightbl_dump_info },
826 [RTM_SETNEIGHTBL - RTM_BASE] = { .doit = neightbl_set },
827 };
828
829 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
830 {
831 struct net_device *dev = ptr;
832 switch (event) {
833 case NETDEV_UNREGISTER:
834 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);
835 break;
836 case NETDEV_REGISTER:
837 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
838 break;
839 case NETDEV_UP:
840 case NETDEV_DOWN:
841 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
842 break;
843 case NETDEV_CHANGE:
844 case NETDEV_GOING_DOWN:
845 break;
846 default:
847 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
848 break;
849 }
850 return NOTIFY_DONE;
851 }
852
853 static struct notifier_block rtnetlink_dev_notifier = {
854 .notifier_call = rtnetlink_event,
855 };
856
857 void __init rtnetlink_init(void)
858 {
859 int i;
860
861 rtattr_max = 0;
862 for (i = 0; i < ARRAY_SIZE(rta_max); i++)
863 if (rta_max[i] > rtattr_max)
864 rtattr_max = rta_max[i];
865 rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL);
866 if (!rta_buf)
867 panic("rtnetlink_init: cannot allocate rta_buf\n");
868
869 rtnl = netlink_kernel_create(NETLINK_ROUTE, RTNLGRP_MAX, rtnetlink_rcv,
870 THIS_MODULE);
871 if (rtnl == NULL)
872 panic("rtnetlink_init: cannot initialize rtnetlink\n");
873 netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV);
874 register_netdevice_notifier(&rtnetlink_dev_notifier);
875 rtnetlink_links[PF_UNSPEC] = link_rtnetlink_table;
876 rtnetlink_links[PF_PACKET] = link_rtnetlink_table;
877 }
878
879 EXPORT_SYMBOL(__rta_fill);
880 EXPORT_SYMBOL(rtattr_strlcpy);
881 EXPORT_SYMBOL(rtattr_parse);
882 EXPORT_SYMBOL(rtnetlink_links);
883 EXPORT_SYMBOL(rtnetlink_put_metrics);
884 EXPORT_SYMBOL(rtnl_lock);
885 EXPORT_SYMBOL(rtnl_trylock);
886 EXPORT_SYMBOL(rtnl_unlock);
887 EXPORT_SYMBOL(rtnl_unicast);
888 EXPORT_SYMBOL(rtnl_notify);
889 EXPORT_SYMBOL(rtnl_set_sk_err);
x86 "subsystem" repository