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[TG3]: Fix tx race condition
[linux-2.6-block.git] / net / core / rtnetlink.c
CommitLineData
1da177e4
LT		 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
1da177e4
LT		 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>
1da177e4
LT		 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>
6756ae4b 37#include <linux/mutex.h>
1da177e4
LT		 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>
9ac4a169 52#include <net/netlink.h>
711e2c33
JT		 53#ifdef CONFIG_NET_WIRELESS_RTNETLINK
54#include <linux/wireless.h>
55#include <net/iw_handler.h>
56#endif /* CONFIG_NET_WIRELESS_RTNETLINK */
1da177e4 57
6756ae4b 58static DEFINE_MUTEX(rtnl_mutex);
1da177e4
LT		 59
60void rtnl_lock(void)
61{
6756ae4b 62 mutex_lock(&rtnl_mutex);
1da177e4
LT		 63}
64
6756ae4b 65void __rtnl_unlock(void)
1da177e4 66{
6756ae4b 67 mutex_unlock(&rtnl_mutex);
1da177e4 68}
6756ae4b 69
1da177e4
LT		 70void rtnl_unlock(void)
71{
6756ae4b
SH		 72 mutex_unlock(&rtnl_mutex);
73 if (rtnl && rtnl->sk_receive_queue.qlen)
74 rtnl->sk_data_ready(rtnl, 0);
1da177e4
LT		 75 netdev_run_todo();
76}
77
6756ae4b
SH		 78int rtnl_trylock(void)
79{
80 return mutex_trylock(&rtnl_mutex);
81}
82
1da177e4
LT		 83int rtattr_parse(struct rtattr *tb[], int maxattr, struct rtattr *rta, int len)
84{
85 memset(tb, 0, sizeof(struct rtattr*)*maxattr);
86
87 while (RTA_OK(rta, len)) {
88 unsigned flavor = rta->rta_type;
89 if (flavor && flavor <= maxattr)
90 tb[flavor-1] = rta;
91 rta = RTA_NEXT(rta, len);
92 }
93 return 0;
94}
95
96struct sock *rtnl;
97
98struct rtnetlink_link * rtnetlink_links[NPROTO];
99
db46edc6 100static const int rtm_min[RTM_NR_FAMILIES] =
1da177e4 101{
f90a0a74
TG		 102 [RTM_FAM(RTM_NEWLINK)] = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
103 [RTM_FAM(RTM_NEWADDR)] = NLMSG_LENGTH(sizeof(struct ifaddrmsg)),
104 [RTM_FAM(RTM_NEWROUTE)] = NLMSG_LENGTH(sizeof(struct rtmsg)),
105 [RTM_FAM(RTM_NEWNEIGH)] = NLMSG_LENGTH(sizeof(struct ndmsg)),
106 [RTM_FAM(RTM_NEWRULE)] = NLMSG_LENGTH(sizeof(struct rtmsg)),
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_NEWPREFIX)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
112 [RTM_FAM(RTM_GETMULTICAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
113 [RTM_FAM(RTM_GETANYCAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
c7fb64db 114 [RTM_FAM(RTM_NEWNEIGHTBL)] = NLMSG_LENGTH(sizeof(struct ndtmsg)),
1da177e4
LT		 115};
116
db46edc6 117static const int rta_max[RTM_NR_FAMILIES] =
1da177e4 118{
f90a0a74
TG		 119 [RTM_FAM(RTM_NEWLINK)] = IFLA_MAX,
120 [RTM_FAM(RTM_NEWADDR)] = IFA_MAX,
121 [RTM_FAM(RTM_NEWROUTE)] = RTA_MAX,
122 [RTM_FAM(RTM_NEWNEIGH)] = NDA_MAX,
123 [RTM_FAM(RTM_NEWRULE)] = RTA_MAX,
124 [RTM_FAM(RTM_NEWQDISC)] = TCA_MAX,
125 [RTM_FAM(RTM_NEWTCLASS)] = TCA_MAX,
126 [RTM_FAM(RTM_NEWTFILTER)] = TCA_MAX,
127 [RTM_FAM(RTM_NEWACTION)] = TCAA_MAX,
c7fb64db 128 [RTM_FAM(RTM_NEWNEIGHTBL)] = NDTA_MAX,
1da177e4
LT		 129};
130
131void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const void *data)
132{
133 struct rtattr *rta;
134 int size = RTA_LENGTH(attrlen);
135
136 rta = (struct rtattr*)skb_put(skb, RTA_ALIGN(size));
137 rta->rta_type = attrtype;
138 rta->rta_len = size;
139 memcpy(RTA_DATA(rta), data, attrlen);
b3563c4f 140 memset(RTA_DATA(rta) + attrlen, 0, RTA_ALIGN(size) - size);
1da177e4
LT		 141}
142
143size_t rtattr_strlcpy(char *dest, const struct rtattr *rta, size_t size)
144{
145 size_t ret = RTA_PAYLOAD(rta);
146 char *src = RTA_DATA(rta);
147
148 if (ret > 0 && src[ret - 1] == '\0')
149 ret--;
150 if (size > 0) {
151 size_t len = (ret >= size) ? size - 1 : ret;
152 memset(dest, 0, size);
153 memcpy(dest, src, len);
154 }
155 return ret;
156}
157
158int rtnetlink_send(struct sk_buff *skb, u32 pid, unsigned group, int echo)
159{
160 int err = 0;
161
ac6d439d 162 NETLINK_CB(skb).dst_group = group;
1da177e4
LT		 163 if (echo)
164 atomic_inc(&skb->users);
165 netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL);
166 if (echo)
167 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
168 return err;
169}
170
171int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics)
172{
173 struct rtattr *mx = (struct rtattr*)skb->tail;
174 int i;
175
176 RTA_PUT(skb, RTA_METRICS, 0, NULL);
177 for (i=0; i<RTAX_MAX; i++) {
178 if (metrics[i])
179 RTA_PUT(skb, i+1, sizeof(u32), metrics+i);
180 }
181 mx->rta_len = skb->tail - (u8*)mx;
182 if (mx->rta_len == RTA_LENGTH(0))
183 skb_trim(skb, (u8*)mx - skb->data);
184 return 0;
185
186rtattr_failure:
187 skb_trim(skb, (u8*)mx - skb->data);
188 return -1;
189}
190
191
b00055aa
SR		 192static void set_operstate(struct net_device *dev, unsigned char transition)
193{
194 unsigned char operstate = dev->operstate;
195
196 switch(transition) {
197 case IF_OPER_UP:
198 if ((operstate == IF_OPER_DORMANT ||
199 operstate == IF_OPER_UNKNOWN) &&
200 !netif_dormant(dev))
201 operstate = IF_OPER_UP;
202 break;
203
204 case IF_OPER_DORMANT:
205 if (operstate == IF_OPER_UP ||
206 operstate == IF_OPER_UNKNOWN)
207 operstate = IF_OPER_DORMANT;
208 break;
209 };
210
211 if (dev->operstate != operstate) {
212 write_lock_bh(&dev_base_lock);
213 dev->operstate = operstate;
214 write_unlock_bh(&dev_base_lock);
215 netdev_state_change(dev);
216 }
217}
218
1da177e4 219static int rtnetlink_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
b6544c0b
JHS		 220 int type, u32 pid, u32 seq, u32 change,
221 unsigned int flags)
1da177e4
LT		 222{
223 struct ifinfomsg *r;
224 struct nlmsghdr *nlh;
225 unsigned char *b = skb->tail;
226
b6544c0b 227 nlh = NLMSG_NEW(skb, pid, seq, type, sizeof(*r), flags);
1da177e4
LT		 228 r = NLMSG_DATA(nlh);
229 r->ifi_family = AF_UNSPEC;
9ef1d4c7 230 r->__ifi_pad = 0;
1da177e4
LT		 231 r->ifi_type = dev->type;
232 r->ifi_index = dev->ifindex;
233 r->ifi_flags = dev_get_flags(dev);
234 r->ifi_change = change;
235
236 RTA_PUT(skb, IFLA_IFNAME, strlen(dev->name)+1, dev->name);
237
238 if (1) {
239 u32 txqlen = dev->tx_queue_len;
240 RTA_PUT(skb, IFLA_TXQLEN, sizeof(txqlen), &txqlen);
241 }
242
243 if (1) {
244 u32 weight = dev->weight;
245 RTA_PUT(skb, IFLA_WEIGHT, sizeof(weight), &weight);
246 }
247
b00055aa
SR		 248 if (1) {
249 u8 operstate = netif_running(dev)?dev->operstate:IF_OPER_DOWN;
250 u8 link_mode = dev->link_mode;
251 RTA_PUT(skb, IFLA_OPERSTATE, sizeof(operstate), &operstate);
252 RTA_PUT(skb, IFLA_LINKMODE, sizeof(link_mode), &link_mode);
253 }
254
1da177e4
LT		 255 if (1) {
256 struct rtnl_link_ifmap map = {
257 .mem_start = dev->mem_start,
258 .mem_end = dev->mem_end,
259 .base_addr = dev->base_addr,
260 .irq = dev->irq,
261 .dma = dev->dma,
262 .port = dev->if_port,
263 };
264 RTA_PUT(skb, IFLA_MAP, sizeof(map), &map);
265 }
266
267 if (dev->addr_len) {
268 RTA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
269 RTA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast);
270 }
271
272 if (1) {
273 u32 mtu = dev->mtu;
274 RTA_PUT(skb, IFLA_MTU, sizeof(mtu), &mtu);
275 }
276
277 if (dev->ifindex != dev->iflink) {
278 u32 iflink = dev->iflink;
279 RTA_PUT(skb, IFLA_LINK, sizeof(iflink), &iflink);
280 }
281
282 if (dev->qdisc_sleeping)
283 RTA_PUT(skb, IFLA_QDISC,
284 strlen(dev->qdisc_sleeping->ops->id) + 1,
285 dev->qdisc_sleeping->ops->id);
286
287 if (dev->master) {
288 u32 master = dev->master->ifindex;
289 RTA_PUT(skb, IFLA_MASTER, sizeof(master), &master);
290 }
291
292 if (dev->get_stats) {
293 unsigned long *stats = (unsigned long*)dev->get_stats(dev);
294 if (stats) {
295 struct rtattr *a;
296 __u32 *s;
297 int i;
298 int n = sizeof(struct rtnl_link_stats)/4;
299
300 a = __RTA_PUT(skb, IFLA_STATS, n*4);
301 s = RTA_DATA(a);
302 for (i=0; i<n; i++)
303 s[i] = stats[i];
304 }
305 }
306 nlh->nlmsg_len = skb->tail - b;
307 return skb->len;
308
309nlmsg_failure:
310rtattr_failure:
311 skb_trim(skb, b - skb->data);
312 return -1;
313}
314
315static int rtnetlink_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
316{
317 int idx;
318 int s_idx = cb->args[0];
319 struct net_device *dev;
320
321 read_lock(&dev_base_lock);
322 for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) {
323 if (idx < s_idx)
324 continue;
b6544c0b
JHS		 325 if (rtnetlink_fill_ifinfo(skb, dev, RTM_NEWLINK,
326 NETLINK_CB(cb->skb).pid,
327 cb->nlh->nlmsg_seq, 0,
328 NLM_F_MULTI) <= 0)
1da177e4
LT		 329 break;
330 }
331 read_unlock(&dev_base_lock);
332 cb->args[0] = idx;
333
334 return skb->len;
335}
336
337static int do_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
338{
339 struct ifinfomsg *ifm = NLMSG_DATA(nlh);
340 struct rtattr **ida = arg;
341 struct net_device *dev;
342 int err, send_addr_notify = 0;
343
344 if (ifm->ifi_index >= 0)
345 dev = dev_get_by_index(ifm->ifi_index);
346 else if (ida[IFLA_IFNAME - 1]) {
347 char ifname[IFNAMSIZ];
348
349 if (rtattr_strlcpy(ifname, ida[IFLA_IFNAME - 1],
350 IFNAMSIZ) >= IFNAMSIZ)
351 return -EINVAL;
352 dev = dev_get_by_name(ifname);
353 } else
354 return -EINVAL;
355
356 if (!dev)
357 return -ENODEV;
358
359 err = -EINVAL;
360
361 if (ifm->ifi_flags)
362 dev_change_flags(dev, ifm->ifi_flags);
363
364 if (ida[IFLA_MAP - 1]) {
365 struct rtnl_link_ifmap *u_map;
366 struct ifmap k_map;
367
368 if (!dev->set_config) {
369 err = -EOPNOTSUPP;
370 goto out;
371 }
372
373 if (!netif_device_present(dev)) {
374 err = -ENODEV;
375 goto out;
376 }
377
378 if (ida[IFLA_MAP - 1]->rta_len != RTA_LENGTH(sizeof(*u_map)))
379 goto out;
380
381 u_map = RTA_DATA(ida[IFLA_MAP - 1]);
382
383 k_map.mem_start = (unsigned long) u_map->mem_start;
384 k_map.mem_end = (unsigned long) u_map->mem_end;
385 k_map.base_addr = (unsigned short) u_map->base_addr;
386 k_map.irq = (unsigned char) u_map->irq;
387 k_map.dma = (unsigned char) u_map->dma;
388 k_map.port = (unsigned char) u_map->port;
389
390 err = dev->set_config(dev, &k_map);
391
392 if (err)
393 goto out;
394 }
395
396 if (ida[IFLA_ADDRESS - 1]) {
397 if (!dev->set_mac_address) {
398 err = -EOPNOTSUPP;
399 goto out;
400 }
401 if (!netif_device_present(dev)) {
402 err = -ENODEV;
403 goto out;
404 }
405 if (ida[IFLA_ADDRESS - 1]->rta_len != RTA_LENGTH(dev->addr_len))
406 goto out;
407
408 err = dev->set_mac_address(dev, RTA_DATA(ida[IFLA_ADDRESS - 1]));
409 if (err)
410 goto out;
411 send_addr_notify = 1;
412 }
413
414 if (ida[IFLA_BROADCAST - 1]) {
415 if (ida[IFLA_BROADCAST - 1]->rta_len != RTA_LENGTH(dev->addr_len))
416 goto out;
417 memcpy(dev->broadcast, RTA_DATA(ida[IFLA_BROADCAST - 1]),
418 dev->addr_len);
419 send_addr_notify = 1;
420 }
421
422 if (ida[IFLA_MTU - 1]) {
423 if (ida[IFLA_MTU - 1]->rta_len != RTA_LENGTH(sizeof(u32)))
424 goto out;
425 err = dev_set_mtu(dev, *((u32 *) RTA_DATA(ida[IFLA_MTU - 1])));
426
427 if (err)
428 goto out;
429
430 }
431
432 if (ida[IFLA_TXQLEN - 1]) {
433 if (ida[IFLA_TXQLEN - 1]->rta_len != RTA_LENGTH(sizeof(u32)))
434 goto out;
435
436 dev->tx_queue_len = *((u32 *) RTA_DATA(ida[IFLA_TXQLEN - 1]));
437 }
438
439 if (ida[IFLA_WEIGHT - 1]) {
440 if (ida[IFLA_WEIGHT - 1]->rta_len != RTA_LENGTH(sizeof(u32)))
441 goto out;
442
443 dev->weight = *((u32 *) RTA_DATA(ida[IFLA_WEIGHT - 1]));
444 }
445
b00055aa
SR		 446 if (ida[IFLA_OPERSTATE - 1]) {
447 if (ida[IFLA_OPERSTATE - 1]->rta_len != RTA_LENGTH(sizeof(u8)))
448 goto out;
449
450 set_operstate(dev, *((u8 *) RTA_DATA(ida[IFLA_OPERSTATE - 1])));
451 }
452
453 if (ida[IFLA_LINKMODE - 1]) {
454 if (ida[IFLA_LINKMODE - 1]->rta_len != RTA_LENGTH(sizeof(u8)))
455 goto out;
456
457 write_lock_bh(&dev_base_lock);
458 dev->link_mode = *((u8 *) RTA_DATA(ida[IFLA_LINKMODE - 1]));
459 write_unlock_bh(&dev_base_lock);
460 }
461
1da177e4
LT		 462 if (ifm->ifi_index >= 0 && ida[IFLA_IFNAME - 1]) {
463 char ifname[IFNAMSIZ];
464
465 if (rtattr_strlcpy(ifname, ida[IFLA_IFNAME - 1],
466 IFNAMSIZ) >= IFNAMSIZ)
467 goto out;
468 err = dev_change_name(dev, ifname);
469 if (err)
470 goto out;
471 }
472
711e2c33
JT		 473#ifdef CONFIG_NET_WIRELESS_RTNETLINK
474 if (ida[IFLA_WIRELESS - 1]) {
475
476 /* Call Wireless Extensions.
477 * Various stuff checked in there... */
478 err = wireless_rtnetlink_set(dev, RTA_DATA(ida[IFLA_WIRELESS - 1]), ida[IFLA_WIRELESS - 1]->rta_len);
479 if (err)
480 goto out;
481 }
482#endif /* CONFIG_NET_WIRELESS_RTNETLINK */
483
1da177e4
LT		 484 err = 0;
485
486out:
487 if (send_addr_notify)
488 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
489
490 dev_put(dev);
491 return err;
492}
493
711e2c33
JT		 494#ifdef CONFIG_NET_WIRELESS_RTNETLINK
495static int do_getlink(struct sk_buff *in_skb, struct nlmsghdr* in_nlh, void *arg)
496{
497 struct ifinfomsg *ifm = NLMSG_DATA(in_nlh);
498 struct rtattr **ida = arg;
499 struct net_device *dev;
500 struct ifinfomsg *r;
501 struct nlmsghdr *nlh;
502 int err = -ENOBUFS;
503 struct sk_buff *skb;
504 unsigned char *b;
505 char *iw_buf = NULL;
506 int iw_buf_len = 0;
507
508 if (ifm->ifi_index >= 0)
509 dev = dev_get_by_index(ifm->ifi_index);
510 else
511 return -EINVAL;
512 if (!dev)
513 return -ENODEV;
514
515#ifdef CONFIG_NET_WIRELESS_RTNETLINK
516 if (ida[IFLA_WIRELESS - 1]) {
517
518 /* Call Wireless Extensions. We need to know the size before
519 * we can alloc. Various stuff checked in there... */
520 err = wireless_rtnetlink_get(dev, RTA_DATA(ida[IFLA_WIRELESS - 1]), ida[IFLA_WIRELESS - 1]->rta_len, &iw_buf, &iw_buf_len);
521 if (err)
522 goto out;
523 }
524#endif /* CONFIG_NET_WIRELESS_RTNETLINK */
525
526 /* Create a skb big enough to include all the data.
527 * Some requests are way bigger than 4k... Jean II */
528 skb = alloc_skb((NLMSG_LENGTH(sizeof(*r))) + (RTA_SPACE(iw_buf_len)),
529 GFP_KERNEL);
530 if (!skb)
531 goto out;
532 b = skb->tail;
533
534 /* Put in the message the usual good stuff */
535 nlh = NLMSG_PUT(skb, NETLINK_CB(in_skb).pid, in_nlh->nlmsg_seq,
536 RTM_NEWLINK, sizeof(*r));
537 r = NLMSG_DATA(nlh);
538 r->ifi_family = AF_UNSPEC;
539 r->__ifi_pad = 0;
540 r->ifi_type = dev->type;
541 r->ifi_index = dev->ifindex;
542 r->ifi_flags = dev->flags;
543 r->ifi_change = 0;
544
545 /* Put the wireless payload if it exist */
546 if(iw_buf != NULL)
547 RTA_PUT(skb, IFLA_WIRELESS, iw_buf_len,
548 iw_buf + IW_EV_POINT_OFF);
549
550 nlh->nlmsg_len = skb->tail - b;
551
552 /* Needed ? */
553 NETLINK_CB(skb).dst_pid = NETLINK_CB(in_skb).pid;
554
555 err = netlink_unicast(rtnl, skb, NETLINK_CB(in_skb).pid, MSG_DONTWAIT);
556 if (err > 0)
557 err = 0;
558out:
559 if(iw_buf != NULL)
560 kfree(iw_buf);
561 dev_put(dev);
562 return err;
563
564rtattr_failure:
565nlmsg_failure:
566 kfree_skb(skb);
567 goto out;
568}
569#endif /* CONFIG_NET_WIRELESS_RTNETLINK */
570
1da177e4
LT		 571static int rtnetlink_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
572{
573 int idx;
574 int s_idx = cb->family;
575
576 if (s_idx == 0)
577 s_idx = 1;
578 for (idx=1; idx<NPROTO; idx++) {
579 int type = cb->nlh->nlmsg_type-RTM_BASE;
580 if (idx < s_idx || idx == PF_PACKET)
581 continue;
582 if (rtnetlink_links[idx] == NULL ||
583 rtnetlink_links[idx][type].dumpit == NULL)
584 continue;
585 if (idx > s_idx)
586 memset(&cb->args[0], 0, sizeof(cb->args));
587 if (rtnetlink_links[idx][type].dumpit(skb, cb))
588 break;
589 }
590 cb->family = idx;
591
592 return skb->len;
593}
594
595void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change)
596{
597 struct sk_buff *skb;
598 int size = NLMSG_SPACE(sizeof(struct ifinfomsg) +
599 sizeof(struct rtnl_link_ifmap) +
600 sizeof(struct rtnl_link_stats) + 128);
601
602 skb = alloc_skb(size, GFP_KERNEL);
603 if (!skb)
604 return;
605
28633514 606 if (rtnetlink_fill_ifinfo(skb, dev, type, 0, 0, change, 0) < 0) {
1da177e4
LT		 607 kfree_skb(skb);
608 return;
609 }
ac6d439d
PM		 610 NETLINK_CB(skb).dst_group = RTNLGRP_LINK;
611 netlink_broadcast(rtnl, skb, 0, RTNLGRP_LINK, GFP_KERNEL);
1da177e4
LT		 612}
613
1da177e4
LT		 614/* Protected by RTNL sempahore. */
615static struct rtattr **rta_buf;
616static int rtattr_max;
617
618/* Process one rtnetlink message. */
619
620static __inline__ int
621rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, int *errp)
622{
623 struct rtnetlink_link *link;
624 struct rtnetlink_link *link_tab;
625 int sz_idx, kind;
626 int min_len;
627 int family;
628 int type;
629 int err;
630
631 /* Only requests are handled by kernel now */
632 if (!(nlh->nlmsg_flags&NLM_F_REQUEST))
633 return 0;
634
635 type = nlh->nlmsg_type;
636
637 /* A control message: ignore them */
638 if (type < RTM_BASE)
639 return 0;
640
641 /* Unknown message: reply with EINVAL */
642 if (type > RTM_MAX)
643 goto err_inval;
644
645 type -= RTM_BASE;
646
647 /* All the messages must have at least 1 byte length */
648 if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg)))
649 return 0;
650
651 family = ((struct rtgenmsg*)NLMSG_DATA(nlh))->rtgen_family;
652 if (family >= NPROTO) {
653 *errp = -EAFNOSUPPORT;
654 return -1;
655 }
656
657 link_tab = rtnetlink_links[family];
658 if (link_tab == NULL)
659 link_tab = rtnetlink_links[PF_UNSPEC];
660 link = &link_tab[type];
661
662 sz_idx = type>>2;
663 kind = type&3;
664
c7bdb545 665 if (kind != 2 && security_netlink_recv(skb, CAP_NET_ADMIN)) {
1da177e4
LT		 666 *errp = -EPERM;
667 return -1;
668 }
669
670 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
1da177e4
LT		 671 if (link->dumpit == NULL)
672 link = &(rtnetlink_links[PF_UNSPEC][type]);
673
674 if (link->dumpit == NULL)
675 goto err_inval;
676
677 if ((*errp = netlink_dump_start(rtnl, skb, nlh,
a8f74b22 678 link->dumpit, NULL)) != 0) {
1da177e4
LT		 679 return -1;
680 }
9ac4a169
TG		 681
682 netlink_queue_skip(nlh, skb);
1da177e4
LT		 683 return -1;
684 }
685
686 memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *)));
687
688 min_len = rtm_min[sz_idx];
689 if (nlh->nlmsg_len < min_len)
690 goto err_inval;
691
692 if (nlh->nlmsg_len > min_len) {
693 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
694 struct rtattr *attr = (void*)nlh + NLMSG_ALIGN(min_len);
695
696 while (RTA_OK(attr, attrlen)) {
697 unsigned flavor = attr->rta_type;
698 if (flavor) {
699 if (flavor > rta_max[sz_idx])
700 goto err_inval;
701 rta_buf[flavor-1] = attr;
702 }
703 attr = RTA_NEXT(attr, attrlen);
704 }
705 }
706
707 if (link->doit == NULL)
708 link = &(rtnetlink_links[PF_UNSPEC][type]);
709 if (link->doit == NULL)
710 goto err_inval;
711 err = link->doit(skb, nlh, (void *)&rta_buf[0]);
712
713 *errp = err;
714 return err;
715
716err_inval:
717 *errp = -EINVAL;
718 return -1;
719}
720
1da177e4
LT		 721static void rtnetlink_rcv(struct sock *sk, int len)
722{
9ac4a169 723 unsigned int qlen = 0;
2a0a6ebe 724
1da177e4 725 do {
6756ae4b 726 mutex_lock(&rtnl_mutex);
9ac4a169 727 netlink_run_queue(sk, &qlen, &rtnetlink_rcv_msg);
6756ae4b 728 mutex_unlock(&rtnl_mutex);
1da177e4
LT		 729
730 netdev_run_todo();
2a0a6ebe 731 } while (qlen);
1da177e4
LT		 732}
733
db46edc6 734static struct rtnetlink_link link_rtnetlink_table[RTM_NR_MSGTYPES] =
1da177e4 735{
711e2c33
JT		 736 [RTM_GETLINK - RTM_BASE] = {
737#ifdef CONFIG_NET_WIRELESS_RTNETLINK
738 .doit = do_getlink,
739#endif /* CONFIG_NET_WIRELESS_RTNETLINK */
740 .dumpit = rtnetlink_dump_ifinfo },
c7fb64db
TG		 741 [RTM_SETLINK - RTM_BASE] = { .doit = do_setlink },
742 [RTM_GETADDR - RTM_BASE] = { .dumpit = rtnetlink_dump_all },
743 [RTM_GETROUTE - RTM_BASE] = { .dumpit = rtnetlink_dump_all },
744 [RTM_NEWNEIGH - RTM_BASE] = { .doit = neigh_add },
745 [RTM_DELNEIGH - RTM_BASE] = { .doit = neigh_delete },
746 [RTM_GETNEIGH - RTM_BASE] = { .dumpit = neigh_dump_info },
747 [RTM_GETRULE - RTM_BASE] = { .dumpit = rtnetlink_dump_all },
748 [RTM_GETNEIGHTBL - RTM_BASE] = { .dumpit = neightbl_dump_info },
749 [RTM_SETNEIGHTBL - RTM_BASE] = { .doit = neightbl_set },
1da177e4
LT		 750};
751
752static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
753{
754 struct net_device *dev = ptr;
755 switch (event) {
756 case NETDEV_UNREGISTER:
757 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);
758 break;
759 case NETDEV_REGISTER:
760 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
761 break;
762 case NETDEV_UP:
763 case NETDEV_DOWN:
764 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
765 break;
766 case NETDEV_CHANGE:
767 case NETDEV_GOING_DOWN:
768 break;
769 default:
770 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
771 break;
772 }
773 return NOTIFY_DONE;
774}
775
776static struct notifier_block rtnetlink_dev_notifier = {
777 .notifier_call = rtnetlink_event,
778};
779
780void __init rtnetlink_init(void)
781{
782 int i;
783
784 rtattr_max = 0;
785 for (i = 0; i < ARRAY_SIZE(rta_max); i++)
786 if (rta_max[i] > rtattr_max)
787 rtattr_max = rta_max[i];
788 rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL);
789 if (!rta_buf)
790 panic("rtnetlink_init: cannot allocate rta_buf\n");
791
06628607
PM		 792 rtnl = netlink_kernel_create(NETLINK_ROUTE, RTNLGRP_MAX, rtnetlink_rcv,
793 THIS_MODULE);
1da177e4
LT		 794 if (rtnl == NULL)
795 panic("rtnetlink_init: cannot initialize rtnetlink\n");
796 netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV);
797 register_netdevice_notifier(&rtnetlink_dev_notifier);
798 rtnetlink_links[PF_UNSPEC] = link_rtnetlink_table;
799 rtnetlink_links[PF_PACKET] = link_rtnetlink_table;
800}
801
802EXPORT_SYMBOL(__rta_fill);
803EXPORT_SYMBOL(rtattr_strlcpy);
804EXPORT_SYMBOL(rtattr_parse);
805EXPORT_SYMBOL(rtnetlink_links);
806EXPORT_SYMBOL(rtnetlink_put_metrics);
807EXPORT_SYMBOL(rtnl);
808EXPORT_SYMBOL(rtnl_lock);
6756ae4b 809EXPORT_SYMBOL(rtnl_trylock);
1da177e4 810EXPORT_SYMBOL(rtnl_unlock);
Linux 6.x block layer and io_uring tree(s)