Commit | Line | Data |
---|---|---|
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> |
1823730f | 38 | #include <linux/if_addr.h> |
1da177e4 LT |
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> | |
14c0b97d | 53 | #include <net/fib_rules.h> |
9ac4a169 | 54 | #include <net/netlink.h> |
711e2c33 JT |
55 | #ifdef CONFIG_NET_WIRELESS_RTNETLINK |
56 | #include <linux/wireless.h> | |
57 | #include <net/iw_handler.h> | |
58 | #endif /* CONFIG_NET_WIRELESS_RTNETLINK */ | |
1da177e4 | 59 | |
6756ae4b | 60 | static DEFINE_MUTEX(rtnl_mutex); |
1da177e4 LT |
61 | |
62 | void rtnl_lock(void) | |
63 | { | |
6756ae4b | 64 | mutex_lock(&rtnl_mutex); |
1da177e4 LT |
65 | } |
66 | ||
6756ae4b | 67 | void __rtnl_unlock(void) |
1da177e4 | 68 | { |
6756ae4b | 69 | mutex_unlock(&rtnl_mutex); |
1da177e4 | 70 | } |
6756ae4b | 71 | |
1da177e4 LT |
72 | void rtnl_unlock(void) |
73 | { | |
6756ae4b SH |
74 | mutex_unlock(&rtnl_mutex); |
75 | if (rtnl && rtnl->sk_receive_queue.qlen) | |
76 | rtnl->sk_data_ready(rtnl, 0); | |
1da177e4 LT |
77 | netdev_run_todo(); |
78 | } | |
79 | ||
6756ae4b SH |
80 | int rtnl_trylock(void) |
81 | { | |
82 | return mutex_trylock(&rtnl_mutex); | |
83 | } | |
84 | ||
1da177e4 LT |
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 | struct sock *rtnl; | |
99 | ||
100 | struct rtnetlink_link * rtnetlink_links[NPROTO]; | |
101 | ||
db46edc6 | 102 | static const int rtm_min[RTM_NR_FAMILIES] = |
1da177e4 | 103 | { |
f90a0a74 TG |
104 | [RTM_FAM(RTM_NEWLINK)] = NLMSG_LENGTH(sizeof(struct ifinfomsg)), |
105 | [RTM_FAM(RTM_NEWADDR)] = NLMSG_LENGTH(sizeof(struct ifaddrmsg)), | |
106 | [RTM_FAM(RTM_NEWROUTE)] = NLMSG_LENGTH(sizeof(struct rtmsg)), | |
107 | [RTM_FAM(RTM_NEWNEIGH)] = NLMSG_LENGTH(sizeof(struct ndmsg)), | |
14c0b97d | 108 | [RTM_FAM(RTM_NEWRULE)] = NLMSG_LENGTH(sizeof(struct fib_rule_hdr)), |
f90a0a74 TG |
109 | [RTM_FAM(RTM_NEWQDISC)] = NLMSG_LENGTH(sizeof(struct tcmsg)), |
110 | [RTM_FAM(RTM_NEWTCLASS)] = NLMSG_LENGTH(sizeof(struct tcmsg)), | |
111 | [RTM_FAM(RTM_NEWTFILTER)] = NLMSG_LENGTH(sizeof(struct tcmsg)), | |
112 | [RTM_FAM(RTM_NEWACTION)] = NLMSG_LENGTH(sizeof(struct tcamsg)), | |
113 | [RTM_FAM(RTM_NEWPREFIX)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)), | |
114 | [RTM_FAM(RTM_GETMULTICAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)), | |
115 | [RTM_FAM(RTM_GETANYCAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)), | |
c7fb64db | 116 | [RTM_FAM(RTM_NEWNEIGHTBL)] = NLMSG_LENGTH(sizeof(struct ndtmsg)), |
1da177e4 LT |
117 | }; |
118 | ||
db46edc6 | 119 | static const int rta_max[RTM_NR_FAMILIES] = |
1da177e4 | 120 | { |
f90a0a74 TG |
121 | [RTM_FAM(RTM_NEWLINK)] = IFLA_MAX, |
122 | [RTM_FAM(RTM_NEWADDR)] = IFA_MAX, | |
123 | [RTM_FAM(RTM_NEWROUTE)] = RTA_MAX, | |
124 | [RTM_FAM(RTM_NEWNEIGH)] = NDA_MAX, | |
14c0b97d | 125 | [RTM_FAM(RTM_NEWRULE)] = FRA_MAX, |
f90a0a74 TG |
126 | [RTM_FAM(RTM_NEWQDISC)] = TCA_MAX, |
127 | [RTM_FAM(RTM_NEWTCLASS)] = TCA_MAX, | |
128 | [RTM_FAM(RTM_NEWTFILTER)] = TCA_MAX, | |
129 | [RTM_FAM(RTM_NEWACTION)] = TCAA_MAX, | |
c7fb64db | 130 | [RTM_FAM(RTM_NEWNEIGHTBL)] = NDTA_MAX, |
1da177e4 LT |
131 | }; |
132 | ||
133 | void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const void *data) | |
134 | { | |
135 | struct rtattr *rta; | |
136 | int size = RTA_LENGTH(attrlen); | |
137 | ||
138 | rta = (struct rtattr*)skb_put(skb, RTA_ALIGN(size)); | |
139 | rta->rta_type = attrtype; | |
140 | rta->rta_len = size; | |
141 | memcpy(RTA_DATA(rta), data, attrlen); | |
b3563c4f | 142 | memset(RTA_DATA(rta) + attrlen, 0, RTA_ALIGN(size) - size); |
1da177e4 LT |
143 | } |
144 | ||
145 | size_t rtattr_strlcpy(char *dest, const struct rtattr *rta, size_t size) | |
146 | { | |
147 | size_t ret = RTA_PAYLOAD(rta); | |
148 | char *src = RTA_DATA(rta); | |
149 | ||
150 | if (ret > 0 && src[ret - 1] == '\0') | |
151 | ret--; | |
152 | if (size > 0) { | |
153 | size_t len = (ret >= size) ? size - 1 : ret; | |
154 | memset(dest, 0, size); | |
155 | memcpy(dest, src, len); | |
156 | } | |
157 | return ret; | |
158 | } | |
159 | ||
160 | int rtnetlink_send(struct sk_buff *skb, u32 pid, unsigned group, int echo) | |
161 | { | |
162 | int err = 0; | |
163 | ||
ac6d439d | 164 | NETLINK_CB(skb).dst_group = group; |
1da177e4 LT |
165 | if (echo) |
166 | atomic_inc(&skb->users); | |
167 | netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL); | |
168 | if (echo) | |
169 | err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT); | |
170 | return err; | |
171 | } | |
172 | ||
173 | int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics) | |
174 | { | |
175 | struct rtattr *mx = (struct rtattr*)skb->tail; | |
176 | int i; | |
177 | ||
178 | RTA_PUT(skb, RTA_METRICS, 0, NULL); | |
179 | for (i=0; i<RTAX_MAX; i++) { | |
180 | if (metrics[i]) | |
181 | RTA_PUT(skb, i+1, sizeof(u32), metrics+i); | |
182 | } | |
183 | mx->rta_len = skb->tail - (u8*)mx; | |
184 | if (mx->rta_len == RTA_LENGTH(0)) | |
185 | skb_trim(skb, (u8*)mx - skb->data); | |
186 | return 0; | |
187 | ||
188 | rtattr_failure: | |
189 | skb_trim(skb, (u8*)mx - skb->data); | |
190 | return -1; | |
191 | } | |
192 | ||
193 | ||
b00055aa SR |
194 | static void set_operstate(struct net_device *dev, unsigned char transition) |
195 | { | |
196 | unsigned char operstate = dev->operstate; | |
197 | ||
198 | switch(transition) { | |
199 | case IF_OPER_UP: | |
200 | if ((operstate == IF_OPER_DORMANT || | |
201 | operstate == IF_OPER_UNKNOWN) && | |
202 | !netif_dormant(dev)) | |
203 | operstate = IF_OPER_UP; | |
204 | break; | |
205 | ||
206 | case IF_OPER_DORMANT: | |
207 | if (operstate == IF_OPER_UP || | |
208 | operstate == IF_OPER_UNKNOWN) | |
209 | operstate = IF_OPER_DORMANT; | |
210 | break; | |
211 | }; | |
212 | ||
213 | if (dev->operstate != operstate) { | |
214 | write_lock_bh(&dev_base_lock); | |
215 | dev->operstate = operstate; | |
216 | write_unlock_bh(&dev_base_lock); | |
217 | netdev_state_change(dev); | |
218 | } | |
219 | } | |
220 | ||
1da177e4 | 221 | static int rtnetlink_fill_ifinfo(struct sk_buff *skb, struct net_device *dev, |
b6544c0b JHS |
222 | int type, u32 pid, u32 seq, u32 change, |
223 | unsigned int flags) | |
1da177e4 LT |
224 | { |
225 | struct ifinfomsg *r; | |
226 | struct nlmsghdr *nlh; | |
227 | unsigned char *b = skb->tail; | |
228 | ||
b6544c0b | 229 | nlh = NLMSG_NEW(skb, pid, seq, type, sizeof(*r), flags); |
1da177e4 LT |
230 | r = NLMSG_DATA(nlh); |
231 | r->ifi_family = AF_UNSPEC; | |
9ef1d4c7 | 232 | r->__ifi_pad = 0; |
1da177e4 LT |
233 | r->ifi_type = dev->type; |
234 | r->ifi_index = dev->ifindex; | |
235 | r->ifi_flags = dev_get_flags(dev); | |
236 | r->ifi_change = change; | |
237 | ||
238 | RTA_PUT(skb, IFLA_IFNAME, strlen(dev->name)+1, dev->name); | |
239 | ||
240 | if (1) { | |
241 | u32 txqlen = dev->tx_queue_len; | |
242 | RTA_PUT(skb, IFLA_TXQLEN, sizeof(txqlen), &txqlen); | |
243 | } | |
244 | ||
245 | if (1) { | |
246 | u32 weight = dev->weight; | |
247 | RTA_PUT(skb, IFLA_WEIGHT, sizeof(weight), &weight); | |
248 | } | |
249 | ||
b00055aa SR |
250 | if (1) { |
251 | u8 operstate = netif_running(dev)?dev->operstate:IF_OPER_DOWN; | |
252 | u8 link_mode = dev->link_mode; | |
253 | RTA_PUT(skb, IFLA_OPERSTATE, sizeof(operstate), &operstate); | |
254 | RTA_PUT(skb, IFLA_LINKMODE, sizeof(link_mode), &link_mode); | |
255 | } | |
256 | ||
1da177e4 LT |
257 | if (1) { |
258 | struct rtnl_link_ifmap map = { | |
259 | .mem_start = dev->mem_start, | |
260 | .mem_end = dev->mem_end, | |
261 | .base_addr = dev->base_addr, | |
262 | .irq = dev->irq, | |
263 | .dma = dev->dma, | |
264 | .port = dev->if_port, | |
265 | }; | |
266 | RTA_PUT(skb, IFLA_MAP, sizeof(map), &map); | |
267 | } | |
268 | ||
269 | if (dev->addr_len) { | |
270 | RTA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr); | |
271 | RTA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast); | |
272 | } | |
273 | ||
274 | if (1) { | |
275 | u32 mtu = dev->mtu; | |
276 | RTA_PUT(skb, IFLA_MTU, sizeof(mtu), &mtu); | |
277 | } | |
278 | ||
279 | if (dev->ifindex != dev->iflink) { | |
280 | u32 iflink = dev->iflink; | |
281 | RTA_PUT(skb, IFLA_LINK, sizeof(iflink), &iflink); | |
282 | } | |
283 | ||
284 | if (dev->qdisc_sleeping) | |
285 | RTA_PUT(skb, IFLA_QDISC, | |
286 | strlen(dev->qdisc_sleeping->ops->id) + 1, | |
287 | dev->qdisc_sleeping->ops->id); | |
288 | ||
289 | if (dev->master) { | |
290 | u32 master = dev->master->ifindex; | |
291 | RTA_PUT(skb, IFLA_MASTER, sizeof(master), &master); | |
292 | } | |
293 | ||
294 | if (dev->get_stats) { | |
295 | unsigned long *stats = (unsigned long*)dev->get_stats(dev); | |
296 | if (stats) { | |
297 | struct rtattr *a; | |
298 | __u32 *s; | |
299 | int i; | |
300 | int n = sizeof(struct rtnl_link_stats)/4; | |
301 | ||
302 | a = __RTA_PUT(skb, IFLA_STATS, n*4); | |
303 | s = RTA_DATA(a); | |
304 | for (i=0; i<n; i++) | |
305 | s[i] = stats[i]; | |
306 | } | |
307 | } | |
308 | nlh->nlmsg_len = skb->tail - b; | |
309 | return skb->len; | |
310 | ||
311 | nlmsg_failure: | |
312 | rtattr_failure: | |
313 | skb_trim(skb, b - skb->data); | |
314 | return -1; | |
315 | } | |
316 | ||
317 | static int rtnetlink_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) | |
318 | { | |
319 | int idx; | |
320 | int s_idx = cb->args[0]; | |
321 | struct net_device *dev; | |
322 | ||
323 | read_lock(&dev_base_lock); | |
324 | for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) { | |
325 | if (idx < s_idx) | |
326 | continue; | |
b6544c0b JHS |
327 | if (rtnetlink_fill_ifinfo(skb, dev, RTM_NEWLINK, |
328 | NETLINK_CB(cb->skb).pid, | |
329 | cb->nlh->nlmsg_seq, 0, | |
330 | NLM_F_MULTI) <= 0) | |
1da177e4 LT |
331 | break; |
332 | } | |
333 | read_unlock(&dev_base_lock); | |
334 | cb->args[0] = idx; | |
335 | ||
336 | return skb->len; | |
337 | } | |
338 | ||
339 | static int do_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) | |
340 | { | |
341 | struct ifinfomsg *ifm = NLMSG_DATA(nlh); | |
342 | struct rtattr **ida = arg; | |
343 | struct net_device *dev; | |
344 | int err, send_addr_notify = 0; | |
345 | ||
346 | if (ifm->ifi_index >= 0) | |
347 | dev = dev_get_by_index(ifm->ifi_index); | |
348 | else if (ida[IFLA_IFNAME - 1]) { | |
349 | char ifname[IFNAMSIZ]; | |
350 | ||
351 | if (rtattr_strlcpy(ifname, ida[IFLA_IFNAME - 1], | |
352 | IFNAMSIZ) >= IFNAMSIZ) | |
353 | return -EINVAL; | |
354 | dev = dev_get_by_name(ifname); | |
355 | } else | |
356 | return -EINVAL; | |
357 | ||
358 | if (!dev) | |
359 | return -ENODEV; | |
360 | ||
361 | err = -EINVAL; | |
362 | ||
363 | if (ifm->ifi_flags) | |
364 | dev_change_flags(dev, ifm->ifi_flags); | |
365 | ||
366 | if (ida[IFLA_MAP - 1]) { | |
367 | struct rtnl_link_ifmap *u_map; | |
368 | struct ifmap k_map; | |
369 | ||
370 | if (!dev->set_config) { | |
371 | err = -EOPNOTSUPP; | |
372 | goto out; | |
373 | } | |
374 | ||
375 | if (!netif_device_present(dev)) { | |
376 | err = -ENODEV; | |
377 | goto out; | |
378 | } | |
379 | ||
380 | if (ida[IFLA_MAP - 1]->rta_len != RTA_LENGTH(sizeof(*u_map))) | |
381 | goto out; | |
382 | ||
383 | u_map = RTA_DATA(ida[IFLA_MAP - 1]); | |
384 | ||
385 | k_map.mem_start = (unsigned long) u_map->mem_start; | |
386 | k_map.mem_end = (unsigned long) u_map->mem_end; | |
387 | k_map.base_addr = (unsigned short) u_map->base_addr; | |
388 | k_map.irq = (unsigned char) u_map->irq; | |
389 | k_map.dma = (unsigned char) u_map->dma; | |
390 | k_map.port = (unsigned char) u_map->port; | |
391 | ||
392 | err = dev->set_config(dev, &k_map); | |
393 | ||
394 | if (err) | |
395 | goto out; | |
396 | } | |
397 | ||
398 | if (ida[IFLA_ADDRESS - 1]) { | |
70f8e78e DM |
399 | struct sockaddr *sa; |
400 | int len; | |
401 | ||
1da177e4 LT |
402 | if (!dev->set_mac_address) { |
403 | err = -EOPNOTSUPP; | |
404 | goto out; | |
405 | } | |
406 | if (!netif_device_present(dev)) { | |
407 | err = -ENODEV; | |
408 | goto out; | |
409 | } | |
410 | if (ida[IFLA_ADDRESS - 1]->rta_len != RTA_LENGTH(dev->addr_len)) | |
411 | goto out; | |
412 | ||
70f8e78e DM |
413 | len = sizeof(sa_family_t) + dev->addr_len; |
414 | sa = kmalloc(len, GFP_KERNEL); | |
415 | if (!sa) { | |
416 | err = -ENOMEM; | |
417 | goto out; | |
418 | } | |
419 | sa->sa_family = dev->type; | |
420 | memcpy(sa->sa_data, RTA_DATA(ida[IFLA_ADDRESS - 1]), | |
421 | dev->addr_len); | |
422 | err = dev->set_mac_address(dev, sa); | |
423 | kfree(sa); | |
1da177e4 LT |
424 | if (err) |
425 | goto out; | |
426 | send_addr_notify = 1; | |
427 | } | |
428 | ||
429 | if (ida[IFLA_BROADCAST - 1]) { | |
430 | if (ida[IFLA_BROADCAST - 1]->rta_len != RTA_LENGTH(dev->addr_len)) | |
431 | goto out; | |
432 | memcpy(dev->broadcast, RTA_DATA(ida[IFLA_BROADCAST - 1]), | |
433 | dev->addr_len); | |
434 | send_addr_notify = 1; | |
435 | } | |
436 | ||
437 | if (ida[IFLA_MTU - 1]) { | |
438 | if (ida[IFLA_MTU - 1]->rta_len != RTA_LENGTH(sizeof(u32))) | |
439 | goto out; | |
440 | err = dev_set_mtu(dev, *((u32 *) RTA_DATA(ida[IFLA_MTU - 1]))); | |
441 | ||
442 | if (err) | |
443 | goto out; | |
444 | ||
445 | } | |
446 | ||
447 | if (ida[IFLA_TXQLEN - 1]) { | |
448 | if (ida[IFLA_TXQLEN - 1]->rta_len != RTA_LENGTH(sizeof(u32))) | |
449 | goto out; | |
450 | ||
451 | dev->tx_queue_len = *((u32 *) RTA_DATA(ida[IFLA_TXQLEN - 1])); | |
452 | } | |
453 | ||
454 | if (ida[IFLA_WEIGHT - 1]) { | |
455 | if (ida[IFLA_WEIGHT - 1]->rta_len != RTA_LENGTH(sizeof(u32))) | |
456 | goto out; | |
457 | ||
458 | dev->weight = *((u32 *) RTA_DATA(ida[IFLA_WEIGHT - 1])); | |
459 | } | |
460 | ||
b00055aa SR |
461 | if (ida[IFLA_OPERSTATE - 1]) { |
462 | if (ida[IFLA_OPERSTATE - 1]->rta_len != RTA_LENGTH(sizeof(u8))) | |
463 | goto out; | |
464 | ||
465 | set_operstate(dev, *((u8 *) RTA_DATA(ida[IFLA_OPERSTATE - 1]))); | |
466 | } | |
467 | ||
468 | if (ida[IFLA_LINKMODE - 1]) { | |
469 | if (ida[IFLA_LINKMODE - 1]->rta_len != RTA_LENGTH(sizeof(u8))) | |
470 | goto out; | |
471 | ||
472 | write_lock_bh(&dev_base_lock); | |
473 | dev->link_mode = *((u8 *) RTA_DATA(ida[IFLA_LINKMODE - 1])); | |
474 | write_unlock_bh(&dev_base_lock); | |
475 | } | |
476 | ||
1da177e4 LT |
477 | if (ifm->ifi_index >= 0 && ida[IFLA_IFNAME - 1]) { |
478 | char ifname[IFNAMSIZ]; | |
479 | ||
480 | if (rtattr_strlcpy(ifname, ida[IFLA_IFNAME - 1], | |
481 | IFNAMSIZ) >= IFNAMSIZ) | |
482 | goto out; | |
483 | err = dev_change_name(dev, ifname); | |
484 | if (err) | |
485 | goto out; | |
486 | } | |
487 | ||
711e2c33 JT |
488 | #ifdef CONFIG_NET_WIRELESS_RTNETLINK |
489 | if (ida[IFLA_WIRELESS - 1]) { | |
490 | ||
491 | /* Call Wireless Extensions. | |
492 | * Various stuff checked in there... */ | |
493 | err = wireless_rtnetlink_set(dev, RTA_DATA(ida[IFLA_WIRELESS - 1]), ida[IFLA_WIRELESS - 1]->rta_len); | |
494 | if (err) | |
495 | goto out; | |
496 | } | |
497 | #endif /* CONFIG_NET_WIRELESS_RTNETLINK */ | |
498 | ||
1da177e4 LT |
499 | err = 0; |
500 | ||
501 | out: | |
502 | if (send_addr_notify) | |
503 | call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); | |
504 | ||
505 | dev_put(dev); | |
506 | return err; | |
507 | } | |
508 | ||
711e2c33 JT |
509 | #ifdef CONFIG_NET_WIRELESS_RTNETLINK |
510 | static int do_getlink(struct sk_buff *in_skb, struct nlmsghdr* in_nlh, void *arg) | |
511 | { | |
512 | struct ifinfomsg *ifm = NLMSG_DATA(in_nlh); | |
513 | struct rtattr **ida = arg; | |
514 | struct net_device *dev; | |
515 | struct ifinfomsg *r; | |
516 | struct nlmsghdr *nlh; | |
517 | int err = -ENOBUFS; | |
518 | struct sk_buff *skb; | |
519 | unsigned char *b; | |
520 | char *iw_buf = NULL; | |
521 | int iw_buf_len = 0; | |
522 | ||
523 | if (ifm->ifi_index >= 0) | |
524 | dev = dev_get_by_index(ifm->ifi_index); | |
525 | else | |
526 | return -EINVAL; | |
527 | if (!dev) | |
528 | return -ENODEV; | |
529 | ||
530 | #ifdef CONFIG_NET_WIRELESS_RTNETLINK | |
531 | if (ida[IFLA_WIRELESS - 1]) { | |
532 | ||
533 | /* Call Wireless Extensions. We need to know the size before | |
534 | * we can alloc. Various stuff checked in there... */ | |
535 | err = wireless_rtnetlink_get(dev, RTA_DATA(ida[IFLA_WIRELESS - 1]), ida[IFLA_WIRELESS - 1]->rta_len, &iw_buf, &iw_buf_len); | |
536 | if (err) | |
537 | goto out; | |
538 | } | |
539 | #endif /* CONFIG_NET_WIRELESS_RTNETLINK */ | |
540 | ||
541 | /* Create a skb big enough to include all the data. | |
542 | * Some requests are way bigger than 4k... Jean II */ | |
543 | skb = alloc_skb((NLMSG_LENGTH(sizeof(*r))) + (RTA_SPACE(iw_buf_len)), | |
544 | GFP_KERNEL); | |
545 | if (!skb) | |
546 | goto out; | |
547 | b = skb->tail; | |
548 | ||
549 | /* Put in the message the usual good stuff */ | |
550 | nlh = NLMSG_PUT(skb, NETLINK_CB(in_skb).pid, in_nlh->nlmsg_seq, | |
551 | RTM_NEWLINK, sizeof(*r)); | |
552 | r = NLMSG_DATA(nlh); | |
553 | r->ifi_family = AF_UNSPEC; | |
554 | r->__ifi_pad = 0; | |
555 | r->ifi_type = dev->type; | |
556 | r->ifi_index = dev->ifindex; | |
557 | r->ifi_flags = dev->flags; | |
558 | r->ifi_change = 0; | |
559 | ||
560 | /* Put the wireless payload if it exist */ | |
561 | if(iw_buf != NULL) | |
562 | RTA_PUT(skb, IFLA_WIRELESS, iw_buf_len, | |
563 | iw_buf + IW_EV_POINT_OFF); | |
564 | ||
565 | nlh->nlmsg_len = skb->tail - b; | |
566 | ||
567 | /* Needed ? */ | |
568 | NETLINK_CB(skb).dst_pid = NETLINK_CB(in_skb).pid; | |
569 | ||
570 | err = netlink_unicast(rtnl, skb, NETLINK_CB(in_skb).pid, MSG_DONTWAIT); | |
571 | if (err > 0) | |
572 | err = 0; | |
573 | out: | |
574 | if(iw_buf != NULL) | |
575 | kfree(iw_buf); | |
576 | dev_put(dev); | |
577 | return err; | |
578 | ||
579 | rtattr_failure: | |
580 | nlmsg_failure: | |
581 | kfree_skb(skb); | |
582 | goto out; | |
583 | } | |
584 | #endif /* CONFIG_NET_WIRELESS_RTNETLINK */ | |
585 | ||
1da177e4 LT |
586 | static int rtnetlink_dump_all(struct sk_buff *skb, struct netlink_callback *cb) |
587 | { | |
588 | int idx; | |
589 | int s_idx = cb->family; | |
590 | ||
591 | if (s_idx == 0) | |
592 | s_idx = 1; | |
593 | for (idx=1; idx<NPROTO; idx++) { | |
594 | int type = cb->nlh->nlmsg_type-RTM_BASE; | |
595 | if (idx < s_idx || idx == PF_PACKET) | |
596 | continue; | |
597 | if (rtnetlink_links[idx] == NULL || | |
598 | rtnetlink_links[idx][type].dumpit == NULL) | |
599 | continue; | |
600 | if (idx > s_idx) | |
601 | memset(&cb->args[0], 0, sizeof(cb->args)); | |
602 | if (rtnetlink_links[idx][type].dumpit(skb, cb)) | |
603 | break; | |
604 | } | |
605 | cb->family = idx; | |
606 | ||
607 | return skb->len; | |
608 | } | |
609 | ||
610 | void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change) | |
611 | { | |
612 | struct sk_buff *skb; | |
613 | int size = NLMSG_SPACE(sizeof(struct ifinfomsg) + | |
614 | sizeof(struct rtnl_link_ifmap) + | |
615 | sizeof(struct rtnl_link_stats) + 128); | |
616 | ||
617 | skb = alloc_skb(size, GFP_KERNEL); | |
618 | if (!skb) | |
619 | return; | |
620 | ||
28633514 | 621 | if (rtnetlink_fill_ifinfo(skb, dev, type, 0, 0, change, 0) < 0) { |
1da177e4 LT |
622 | kfree_skb(skb); |
623 | return; | |
624 | } | |
ac6d439d PM |
625 | NETLINK_CB(skb).dst_group = RTNLGRP_LINK; |
626 | netlink_broadcast(rtnl, skb, 0, RTNLGRP_LINK, GFP_KERNEL); | |
1da177e4 LT |
627 | } |
628 | ||
1da177e4 LT |
629 | /* Protected by RTNL sempahore. */ |
630 | static struct rtattr **rta_buf; | |
631 | static int rtattr_max; | |
632 | ||
633 | /* Process one rtnetlink message. */ | |
634 | ||
635 | static __inline__ int | |
636 | rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, int *errp) | |
637 | { | |
638 | struct rtnetlink_link *link; | |
639 | struct rtnetlink_link *link_tab; | |
640 | int sz_idx, kind; | |
641 | int min_len; | |
642 | int family; | |
643 | int type; | |
644 | int err; | |
645 | ||
646 | /* Only requests are handled by kernel now */ | |
647 | if (!(nlh->nlmsg_flags&NLM_F_REQUEST)) | |
648 | return 0; | |
649 | ||
650 | type = nlh->nlmsg_type; | |
651 | ||
652 | /* A control message: ignore them */ | |
653 | if (type < RTM_BASE) | |
654 | return 0; | |
655 | ||
656 | /* Unknown message: reply with EINVAL */ | |
657 | if (type > RTM_MAX) | |
658 | goto err_inval; | |
659 | ||
660 | type -= RTM_BASE; | |
661 | ||
662 | /* All the messages must have at least 1 byte length */ | |
663 | if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg))) | |
664 | return 0; | |
665 | ||
666 | family = ((struct rtgenmsg*)NLMSG_DATA(nlh))->rtgen_family; | |
667 | if (family >= NPROTO) { | |
668 | *errp = -EAFNOSUPPORT; | |
669 | return -1; | |
670 | } | |
671 | ||
672 | link_tab = rtnetlink_links[family]; | |
673 | if (link_tab == NULL) | |
674 | link_tab = rtnetlink_links[PF_UNSPEC]; | |
675 | link = &link_tab[type]; | |
676 | ||
677 | sz_idx = type>>2; | |
678 | kind = type&3; | |
679 | ||
c7bdb545 | 680 | if (kind != 2 && security_netlink_recv(skb, CAP_NET_ADMIN)) { |
1da177e4 LT |
681 | *errp = -EPERM; |
682 | return -1; | |
683 | } | |
684 | ||
685 | if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) { | |
1da177e4 LT |
686 | if (link->dumpit == NULL) |
687 | link = &(rtnetlink_links[PF_UNSPEC][type]); | |
688 | ||
689 | if (link->dumpit == NULL) | |
690 | goto err_inval; | |
691 | ||
692 | if ((*errp = netlink_dump_start(rtnl, skb, nlh, | |
a8f74b22 | 693 | link->dumpit, NULL)) != 0) { |
1da177e4 LT |
694 | return -1; |
695 | } | |
9ac4a169 TG |
696 | |
697 | netlink_queue_skip(nlh, skb); | |
1da177e4 LT |
698 | return -1; |
699 | } | |
700 | ||
701 | memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *))); | |
702 | ||
703 | min_len = rtm_min[sz_idx]; | |
704 | if (nlh->nlmsg_len < min_len) | |
705 | goto err_inval; | |
706 | ||
707 | if (nlh->nlmsg_len > min_len) { | |
708 | int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len); | |
709 | struct rtattr *attr = (void*)nlh + NLMSG_ALIGN(min_len); | |
710 | ||
711 | while (RTA_OK(attr, attrlen)) { | |
712 | unsigned flavor = attr->rta_type; | |
713 | if (flavor) { | |
714 | if (flavor > rta_max[sz_idx]) | |
715 | goto err_inval; | |
716 | rta_buf[flavor-1] = attr; | |
717 | } | |
718 | attr = RTA_NEXT(attr, attrlen); | |
719 | } | |
720 | } | |
721 | ||
722 | if (link->doit == NULL) | |
723 | link = &(rtnetlink_links[PF_UNSPEC][type]); | |
724 | if (link->doit == NULL) | |
725 | goto err_inval; | |
726 | err = link->doit(skb, nlh, (void *)&rta_buf[0]); | |
727 | ||
728 | *errp = err; | |
729 | return err; | |
730 | ||
731 | err_inval: | |
732 | *errp = -EINVAL; | |
733 | return -1; | |
734 | } | |
735 | ||
1da177e4 LT |
736 | static void rtnetlink_rcv(struct sock *sk, int len) |
737 | { | |
9ac4a169 | 738 | unsigned int qlen = 0; |
2a0a6ebe | 739 | |
1da177e4 | 740 | do { |
6756ae4b | 741 | mutex_lock(&rtnl_mutex); |
9ac4a169 | 742 | netlink_run_queue(sk, &qlen, &rtnetlink_rcv_msg); |
6756ae4b | 743 | mutex_unlock(&rtnl_mutex); |
1da177e4 LT |
744 | |
745 | netdev_run_todo(); | |
2a0a6ebe | 746 | } while (qlen); |
1da177e4 LT |
747 | } |
748 | ||
db46edc6 | 749 | static struct rtnetlink_link link_rtnetlink_table[RTM_NR_MSGTYPES] = |
1da177e4 | 750 | { |
711e2c33 JT |
751 | [RTM_GETLINK - RTM_BASE] = { |
752 | #ifdef CONFIG_NET_WIRELESS_RTNETLINK | |
753 | .doit = do_getlink, | |
754 | #endif /* CONFIG_NET_WIRELESS_RTNETLINK */ | |
755 | .dumpit = rtnetlink_dump_ifinfo }, | |
c7fb64db TG |
756 | [RTM_SETLINK - RTM_BASE] = { .doit = do_setlink }, |
757 | [RTM_GETADDR - RTM_BASE] = { .dumpit = rtnetlink_dump_all }, | |
758 | [RTM_GETROUTE - RTM_BASE] = { .dumpit = rtnetlink_dump_all }, | |
759 | [RTM_NEWNEIGH - RTM_BASE] = { .doit = neigh_add }, | |
760 | [RTM_DELNEIGH - RTM_BASE] = { .doit = neigh_delete }, | |
761 | [RTM_GETNEIGH - RTM_BASE] = { .dumpit = neigh_dump_info }, | |
14c0b97d TG |
762 | #ifdef CONFIG_FIB_RULES |
763 | [RTM_NEWRULE - RTM_BASE] = { .doit = fib_nl_newrule }, | |
764 | [RTM_DELRULE - RTM_BASE] = { .doit = fib_nl_delrule }, | |
765 | #endif | |
c7fb64db TG |
766 | [RTM_GETRULE - RTM_BASE] = { .dumpit = rtnetlink_dump_all }, |
767 | [RTM_GETNEIGHTBL - RTM_BASE] = { .dumpit = neightbl_dump_info }, | |
768 | [RTM_SETNEIGHTBL - RTM_BASE] = { .doit = neightbl_set }, | |
1da177e4 LT |
769 | }; |
770 | ||
771 | static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr) | |
772 | { | |
773 | struct net_device *dev = ptr; | |
774 | switch (event) { | |
775 | case NETDEV_UNREGISTER: | |
776 | rtmsg_ifinfo(RTM_DELLINK, dev, ~0U); | |
777 | break; | |
778 | case NETDEV_REGISTER: | |
779 | rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U); | |
780 | break; | |
781 | case NETDEV_UP: | |
782 | case NETDEV_DOWN: | |
783 | rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING); | |
784 | break; | |
785 | case NETDEV_CHANGE: | |
786 | case NETDEV_GOING_DOWN: | |
787 | break; | |
788 | default: | |
789 | rtmsg_ifinfo(RTM_NEWLINK, dev, 0); | |
790 | break; | |
791 | } | |
792 | return NOTIFY_DONE; | |
793 | } | |
794 | ||
795 | static struct notifier_block rtnetlink_dev_notifier = { | |
796 | .notifier_call = rtnetlink_event, | |
797 | }; | |
798 | ||
799 | void __init rtnetlink_init(void) | |
800 | { | |
801 | int i; | |
802 | ||
803 | rtattr_max = 0; | |
804 | for (i = 0; i < ARRAY_SIZE(rta_max); i++) | |
805 | if (rta_max[i] > rtattr_max) | |
806 | rtattr_max = rta_max[i]; | |
807 | rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL); | |
808 | if (!rta_buf) | |
809 | panic("rtnetlink_init: cannot allocate rta_buf\n"); | |
810 | ||
06628607 PM |
811 | rtnl = netlink_kernel_create(NETLINK_ROUTE, RTNLGRP_MAX, rtnetlink_rcv, |
812 | THIS_MODULE); | |
1da177e4 LT |
813 | if (rtnl == NULL) |
814 | panic("rtnetlink_init: cannot initialize rtnetlink\n"); | |
815 | netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV); | |
816 | register_netdevice_notifier(&rtnetlink_dev_notifier); | |
817 | rtnetlink_links[PF_UNSPEC] = link_rtnetlink_table; | |
818 | rtnetlink_links[PF_PACKET] = link_rtnetlink_table; | |
819 | } | |
820 | ||
821 | EXPORT_SYMBOL(__rta_fill); | |
822 | EXPORT_SYMBOL(rtattr_strlcpy); | |
823 | EXPORT_SYMBOL(rtattr_parse); | |
824 | EXPORT_SYMBOL(rtnetlink_links); | |
825 | EXPORT_SYMBOL(rtnetlink_put_metrics); | |
826 | EXPORT_SYMBOL(rtnl); | |
827 | EXPORT_SYMBOL(rtnl_lock); | |
6756ae4b | 828 | EXPORT_SYMBOL(rtnl_trylock); |
1da177e4 | 829 | EXPORT_SYMBOL(rtnl_unlock); |