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Commit | Line | Data |
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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)), | |
14c0b97d | 107 | [RTM_FAM(RTM_NEWRULE)] = NLMSG_LENGTH(sizeof(struct fib_rule_hdr)), |
f90a0a74 TG |
108 | [RTM_FAM(RTM_NEWQDISC)] = NLMSG_LENGTH(sizeof(struct tcmsg)), |
109 | [RTM_FAM(RTM_NEWTCLASS)] = NLMSG_LENGTH(sizeof(struct tcmsg)), | |
110 | [RTM_FAM(RTM_NEWTFILTER)] = NLMSG_LENGTH(sizeof(struct tcmsg)), | |
111 | [RTM_FAM(RTM_NEWACTION)] = NLMSG_LENGTH(sizeof(struct tcamsg)), | |
112 | [RTM_FAM(RTM_NEWPREFIX)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)), | |
113 | [RTM_FAM(RTM_GETMULTICAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)), | |
114 | [RTM_FAM(RTM_GETANYCAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)), | |
1da177e4 LT |
115 | }; |
116 | ||
db46edc6 | 117 | static 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, | |
14c0b97d | 122 | [RTM_FAM(RTM_NEWRULE)] = FRA_MAX, |
f90a0a74 TG |
123 | [RTM_FAM(RTM_NEWQDISC)] = TCA_MAX, |
124 | [RTM_FAM(RTM_NEWTCLASS)] = TCA_MAX, | |
125 | [RTM_FAM(RTM_NEWTFILTER)] = TCA_MAX, | |
126 | [RTM_FAM(RTM_NEWACTION)] = TCAA_MAX, | |
1da177e4 LT |
127 | }; |
128 | ||
129 | void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const void *data) | |
130 | { | |
131 | struct rtattr *rta; | |
132 | int size = RTA_LENGTH(attrlen); | |
133 | ||
134 | rta = (struct rtattr*)skb_put(skb, RTA_ALIGN(size)); | |
135 | rta->rta_type = attrtype; | |
136 | rta->rta_len = size; | |
137 | memcpy(RTA_DATA(rta), data, attrlen); | |
b3563c4f | 138 | memset(RTA_DATA(rta) + attrlen, 0, RTA_ALIGN(size) - size); |
1da177e4 LT |
139 | } |
140 | ||
141 | size_t rtattr_strlcpy(char *dest, const struct rtattr *rta, size_t size) | |
142 | { | |
143 | size_t ret = RTA_PAYLOAD(rta); | |
144 | char *src = RTA_DATA(rta); | |
145 | ||
146 | if (ret > 0 && src[ret - 1] == '\0') | |
147 | ret--; | |
148 | if (size > 0) { | |
149 | size_t len = (ret >= size) ? size - 1 : ret; | |
150 | memset(dest, 0, size); | |
151 | memcpy(dest, src, len); | |
152 | } | |
153 | return ret; | |
154 | } | |
155 | ||
156 | int rtnetlink_send(struct sk_buff *skb, u32 pid, unsigned group, int echo) | |
157 | { | |
158 | int err = 0; | |
159 | ||
ac6d439d | 160 | NETLINK_CB(skb).dst_group = group; |
1da177e4 LT |
161 | if (echo) |
162 | atomic_inc(&skb->users); | |
163 | netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL); | |
164 | if (echo) | |
165 | err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT); | |
166 | return err; | |
167 | } | |
168 | ||
2942e900 TG |
169 | int rtnl_unicast(struct sk_buff *skb, u32 pid) |
170 | { | |
171 | return nlmsg_unicast(rtnl, skb, pid); | |
172 | } | |
173 | ||
97676b6b TG |
174 | int rtnl_notify(struct sk_buff *skb, u32 pid, u32 group, |
175 | struct nlmsghdr *nlh, gfp_t flags) | |
176 | { | |
177 | int report = 0; | |
178 | ||
179 | if (nlh) | |
180 | report = nlmsg_report(nlh); | |
181 | ||
182 | return nlmsg_notify(rtnl, skb, pid, group, report, flags); | |
183 | } | |
184 | ||
185 | void rtnl_set_sk_err(u32 group, int error) | |
186 | { | |
187 | netlink_set_err(rtnl, 0, group, error); | |
188 | } | |
189 | ||
1da177e4 LT |
190 | int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics) |
191 | { | |
192 | struct rtattr *mx = (struct rtattr*)skb->tail; | |
193 | int i; | |
194 | ||
195 | RTA_PUT(skb, RTA_METRICS, 0, NULL); | |
196 | for (i=0; i<RTAX_MAX; i++) { | |
197 | if (metrics[i]) | |
198 | RTA_PUT(skb, i+1, sizeof(u32), metrics+i); | |
199 | } | |
200 | mx->rta_len = skb->tail - (u8*)mx; | |
201 | if (mx->rta_len == RTA_LENGTH(0)) | |
202 | skb_trim(skb, (u8*)mx - skb->data); | |
203 | return 0; | |
204 | ||
205 | rtattr_failure: | |
206 | skb_trim(skb, (u8*)mx - skb->data); | |
207 | return -1; | |
208 | } | |
209 | ||
210 | ||
b00055aa SR |
211 | static void set_operstate(struct net_device *dev, unsigned char transition) |
212 | { | |
213 | unsigned char operstate = dev->operstate; | |
214 | ||
215 | switch(transition) { | |
216 | case IF_OPER_UP: | |
217 | if ((operstate == IF_OPER_DORMANT || | |
218 | operstate == IF_OPER_UNKNOWN) && | |
219 | !netif_dormant(dev)) | |
220 | operstate = IF_OPER_UP; | |
221 | break; | |
222 | ||
223 | case IF_OPER_DORMANT: | |
224 | if (operstate == IF_OPER_UP || | |
225 | operstate == IF_OPER_UNKNOWN) | |
226 | operstate = IF_OPER_DORMANT; | |
227 | break; | |
228 | }; | |
229 | ||
230 | if (dev->operstate != operstate) { | |
231 | write_lock_bh(&dev_base_lock); | |
232 | dev->operstate = operstate; | |
233 | write_unlock_bh(&dev_base_lock); | |
234 | netdev_state_change(dev); | |
235 | } | |
236 | } | |
237 | ||
b60c5115 TG |
238 | static void copy_rtnl_link_stats(struct rtnl_link_stats *a, |
239 | struct net_device_stats *b) | |
1da177e4 | 240 | { |
b60c5115 TG |
241 | a->rx_packets = b->rx_packets; |
242 | a->tx_packets = b->tx_packets; | |
243 | a->rx_bytes = b->rx_bytes; | |
244 | a->tx_bytes = b->tx_bytes; | |
245 | a->rx_errors = b->rx_errors; | |
246 | a->tx_errors = b->tx_errors; | |
247 | a->rx_dropped = b->rx_dropped; | |
248 | a->tx_dropped = b->tx_dropped; | |
249 | ||
250 | a->multicast = b->multicast; | |
251 | a->collisions = b->collisions; | |
252 | ||
253 | a->rx_length_errors = b->rx_length_errors; | |
254 | a->rx_over_errors = b->rx_over_errors; | |
255 | a->rx_crc_errors = b->rx_crc_errors; | |
256 | a->rx_frame_errors = b->rx_frame_errors; | |
257 | a->rx_fifo_errors = b->rx_fifo_errors; | |
258 | a->rx_missed_errors = b->rx_missed_errors; | |
259 | ||
260 | a->tx_aborted_errors = b->tx_aborted_errors; | |
261 | a->tx_carrier_errors = b->tx_carrier_errors; | |
262 | a->tx_fifo_errors = b->tx_fifo_errors; | |
263 | a->tx_heartbeat_errors = b->tx_heartbeat_errors; | |
264 | a->tx_window_errors = b->tx_window_errors; | |
265 | ||
266 | a->rx_compressed = b->rx_compressed; | |
267 | a->tx_compressed = b->tx_compressed; | |
268 | }; | |
1da177e4 | 269 | |
b60c5115 TG |
270 | static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev, |
271 | void *iwbuf, int iwbuflen, int type, u32 pid, | |
272 | u32 seq, u32 change, unsigned int flags) | |
273 | { | |
274 | struct ifinfomsg *ifm; | |
275 | struct nlmsghdr *nlh; | |
1da177e4 | 276 | |
b60c5115 TG |
277 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags); |
278 | if (nlh == NULL) | |
279 | return -ENOBUFS; | |
1da177e4 | 280 | |
b60c5115 TG |
281 | ifm = nlmsg_data(nlh); |
282 | ifm->ifi_family = AF_UNSPEC; | |
283 | ifm->__ifi_pad = 0; | |
284 | ifm->ifi_type = dev->type; | |
285 | ifm->ifi_index = dev->ifindex; | |
286 | ifm->ifi_flags = dev_get_flags(dev); | |
287 | ifm->ifi_change = change; | |
288 | ||
289 | NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name); | |
290 | NLA_PUT_U32(skb, IFLA_TXQLEN, dev->tx_queue_len); | |
291 | NLA_PUT_U32(skb, IFLA_WEIGHT, dev->weight); | |
292 | NLA_PUT_U8(skb, IFLA_OPERSTATE, | |
293 | netif_running(dev) ? dev->operstate : IF_OPER_DOWN); | |
294 | NLA_PUT_U8(skb, IFLA_LINKMODE, dev->link_mode); | |
295 | NLA_PUT_U32(skb, IFLA_MTU, dev->mtu); | |
296 | ||
297 | if (dev->ifindex != dev->iflink) | |
298 | NLA_PUT_U32(skb, IFLA_LINK, dev->iflink); | |
299 | ||
300 | if (dev->master) | |
301 | NLA_PUT_U32(skb, IFLA_MASTER, dev->master->ifindex); | |
1da177e4 | 302 | |
b60c5115 TG |
303 | if (dev->qdisc_sleeping) |
304 | NLA_PUT_STRING(skb, IFLA_QDISC, dev->qdisc_sleeping->ops->id); | |
b00055aa | 305 | |
1da177e4 LT |
306 | if (1) { |
307 | struct rtnl_link_ifmap map = { | |
308 | .mem_start = dev->mem_start, | |
309 | .mem_end = dev->mem_end, | |
310 | .base_addr = dev->base_addr, | |
311 | .irq = dev->irq, | |
312 | .dma = dev->dma, | |
313 | .port = dev->if_port, | |
314 | }; | |
b60c5115 | 315 | NLA_PUT(skb, IFLA_MAP, sizeof(map), &map); |
1da177e4 LT |
316 | } |
317 | ||
318 | if (dev->addr_len) { | |
b60c5115 TG |
319 | NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr); |
320 | NLA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast); | |
1da177e4 LT |
321 | } |
322 | ||
323 | if (dev->get_stats) { | |
b60c5115 | 324 | struct net_device_stats *stats = dev->get_stats(dev); |
1da177e4 | 325 | if (stats) { |
b60c5115 TG |
326 | struct nlattr *attr; |
327 | ||
328 | attr = nla_reserve(skb, IFLA_STATS, | |
329 | sizeof(struct rtnl_link_stats)); | |
330 | if (attr == NULL) | |
331 | goto nla_put_failure; | |
332 | ||
333 | copy_rtnl_link_stats(nla_data(attr), stats); | |
1da177e4 LT |
334 | } |
335 | } | |
1da177e4 | 336 | |
b60c5115 TG |
337 | if (iwbuf) |
338 | NLA_PUT(skb, IFLA_WIRELESS, iwbuflen, iwbuf); | |
339 | ||
340 | return nlmsg_end(skb, nlh); | |
341 | ||
342 | nla_put_failure: | |
343 | return nlmsg_cancel(skb, nlh); | |
1da177e4 LT |
344 | } |
345 | ||
b60c5115 | 346 | static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) |
1da177e4 LT |
347 | { |
348 | int idx; | |
349 | int s_idx = cb->args[0]; | |
350 | struct net_device *dev; | |
351 | ||
352 | read_lock(&dev_base_lock); | |
353 | for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) { | |
354 | if (idx < s_idx) | |
355 | continue; | |
b60c5115 TG |
356 | if (rtnl_fill_ifinfo(skb, dev, NULL, 0, RTM_NEWLINK, |
357 | NETLINK_CB(cb->skb).pid, | |
358 | cb->nlh->nlmsg_seq, 0, NLM_F_MULTI) <= 0) | |
1da177e4 LT |
359 | break; |
360 | } | |
361 | read_unlock(&dev_base_lock); | |
362 | cb->args[0] = idx; | |
363 | ||
364 | return skb->len; | |
365 | } | |
366 | ||
da5e0494 TG |
367 | static struct nla_policy ifla_policy[IFLA_MAX+1] __read_mostly = { |
368 | [IFLA_IFNAME] = { .type = NLA_STRING }, | |
369 | [IFLA_MAP] = { .minlen = sizeof(struct rtnl_link_ifmap) }, | |
370 | [IFLA_MTU] = { .type = NLA_U32 }, | |
371 | [IFLA_TXQLEN] = { .type = NLA_U32 }, | |
372 | [IFLA_WEIGHT] = { .type = NLA_U32 }, | |
373 | [IFLA_OPERSTATE] = { .type = NLA_U8 }, | |
374 | [IFLA_LINKMODE] = { .type = NLA_U8 }, | |
375 | }; | |
376 | ||
377 | static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) | |
1da177e4 | 378 | { |
da5e0494 | 379 | struct ifinfomsg *ifm; |
1da177e4 | 380 | struct net_device *dev; |
da5e0494 TG |
381 | int err, send_addr_notify = 0, modified = 0; |
382 | struct nlattr *tb[IFLA_MAX+1]; | |
383 | char ifname[IFNAMSIZ]; | |
1da177e4 | 384 | |
da5e0494 TG |
385 | err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); |
386 | if (err < 0) | |
387 | goto errout; | |
388 | ||
389 | if (tb[IFLA_IFNAME] && | |
390 | nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ) >= IFNAMSIZ) | |
391 | return -EINVAL; | |
392 | ||
393 | err = -EINVAL; | |
394 | ifm = nlmsg_data(nlh); | |
1da177e4 LT |
395 | if (ifm->ifi_index >= 0) |
396 | dev = dev_get_by_index(ifm->ifi_index); | |
da5e0494 | 397 | else if (tb[IFLA_IFNAME]) |
1da177e4 | 398 | dev = dev_get_by_name(ifname); |
da5e0494 TG |
399 | else |
400 | goto errout; | |
1da177e4 | 401 | |
da5e0494 TG |
402 | if (dev == NULL) { |
403 | err = -ENODEV; | |
404 | goto errout; | |
405 | } | |
1da177e4 | 406 | |
da5e0494 TG |
407 | if (tb[IFLA_ADDRESS] && |
408 | nla_len(tb[IFLA_ADDRESS]) < dev->addr_len) | |
409 | goto errout_dev; | |
1da177e4 | 410 | |
da5e0494 TG |
411 | if (tb[IFLA_BROADCAST] && |
412 | nla_len(tb[IFLA_BROADCAST]) < dev->addr_len) | |
413 | goto errout_dev; | |
1da177e4 | 414 | |
da5e0494 | 415 | if (tb[IFLA_MAP]) { |
1da177e4 LT |
416 | struct rtnl_link_ifmap *u_map; |
417 | struct ifmap k_map; | |
418 | ||
419 | if (!dev->set_config) { | |
420 | err = -EOPNOTSUPP; | |
da5e0494 | 421 | goto errout_dev; |
1da177e4 LT |
422 | } |
423 | ||
424 | if (!netif_device_present(dev)) { | |
425 | err = -ENODEV; | |
da5e0494 | 426 | goto errout_dev; |
1da177e4 | 427 | } |
1da177e4 | 428 | |
da5e0494 | 429 | u_map = nla_data(tb[IFLA_MAP]); |
1da177e4 LT |
430 | k_map.mem_start = (unsigned long) u_map->mem_start; |
431 | k_map.mem_end = (unsigned long) u_map->mem_end; | |
432 | k_map.base_addr = (unsigned short) u_map->base_addr; | |
433 | k_map.irq = (unsigned char) u_map->irq; | |
434 | k_map.dma = (unsigned char) u_map->dma; | |
435 | k_map.port = (unsigned char) u_map->port; | |
436 | ||
437 | err = dev->set_config(dev, &k_map); | |
da5e0494 TG |
438 | if (err < 0) |
439 | goto errout_dev; | |
1da177e4 | 440 | |
da5e0494 | 441 | modified = 1; |
1da177e4 LT |
442 | } |
443 | ||
da5e0494 | 444 | if (tb[IFLA_ADDRESS]) { |
70f8e78e DM |
445 | struct sockaddr *sa; |
446 | int len; | |
447 | ||
1da177e4 LT |
448 | if (!dev->set_mac_address) { |
449 | err = -EOPNOTSUPP; | |
da5e0494 | 450 | goto errout_dev; |
1da177e4 | 451 | } |
da5e0494 | 452 | |
1da177e4 LT |
453 | if (!netif_device_present(dev)) { |
454 | err = -ENODEV; | |
da5e0494 | 455 | goto errout_dev; |
1da177e4 | 456 | } |
1da177e4 | 457 | |
70f8e78e DM |
458 | len = sizeof(sa_family_t) + dev->addr_len; |
459 | sa = kmalloc(len, GFP_KERNEL); | |
460 | if (!sa) { | |
461 | err = -ENOMEM; | |
da5e0494 | 462 | goto errout_dev; |
70f8e78e DM |
463 | } |
464 | sa->sa_family = dev->type; | |
da5e0494 | 465 | memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]), |
70f8e78e DM |
466 | dev->addr_len); |
467 | err = dev->set_mac_address(dev, sa); | |
468 | kfree(sa); | |
1da177e4 | 469 | if (err) |
da5e0494 | 470 | goto errout_dev; |
1da177e4 | 471 | send_addr_notify = 1; |
da5e0494 | 472 | modified = 1; |
1da177e4 LT |
473 | } |
474 | ||
da5e0494 TG |
475 | if (tb[IFLA_MTU]) { |
476 | err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU])); | |
477 | if (err < 0) | |
478 | goto errout_dev; | |
479 | modified = 1; | |
1da177e4 LT |
480 | } |
481 | ||
da5e0494 TG |
482 | /* |
483 | * Interface selected by interface index but interface | |
484 | * name provided implies that a name change has been | |
485 | * requested. | |
486 | */ | |
487 | if (ifm->ifi_index >= 0 && ifname[0]) { | |
488 | err = dev_change_name(dev, ifname); | |
489 | if (err < 0) | |
490 | goto errout_dev; | |
491 | modified = 1; | |
1da177e4 LT |
492 | } |
493 | ||
da5e0494 TG |
494 | #ifdef CONFIG_NET_WIRELESS_RTNETLINK |
495 | if (tb[IFLA_WIRELESS]) { | |
496 | /* Call Wireless Extensions. | |
497 | * Various stuff checked in there... */ | |
498 | err = wireless_rtnetlink_set(dev, nla_data(tb[IFLA_WIRELESS]), | |
499 | nla_len(tb[IFLA_WIRELESS])); | |
500 | if (err < 0) | |
501 | goto errout_dev; | |
502 | } | |
503 | #endif /* CONFIG_NET_WIRELESS_RTNETLINK */ | |
1da177e4 | 504 | |
da5e0494 TG |
505 | if (tb[IFLA_BROADCAST]) { |
506 | nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len); | |
507 | send_addr_notify = 1; | |
1da177e4 LT |
508 | } |
509 | ||
1da177e4 | 510 | |
da5e0494 TG |
511 | if (ifm->ifi_flags) |
512 | dev_change_flags(dev, ifm->ifi_flags); | |
1da177e4 | 513 | |
da5e0494 TG |
514 | if (tb[IFLA_TXQLEN]) |
515 | dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]); | |
b00055aa | 516 | |
da5e0494 TG |
517 | if (tb[IFLA_WEIGHT]) |
518 | dev->weight = nla_get_u32(tb[IFLA_WEIGHT]); | |
b00055aa | 519 | |
da5e0494 TG |
520 | if (tb[IFLA_OPERSTATE]) |
521 | set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); | |
b00055aa | 522 | |
da5e0494 | 523 | if (tb[IFLA_LINKMODE]) { |
b00055aa | 524 | write_lock_bh(&dev_base_lock); |
da5e0494 | 525 | dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]); |
b00055aa SR |
526 | write_unlock_bh(&dev_base_lock); |
527 | } | |
528 | ||
1da177e4 LT |
529 | err = 0; |
530 | ||
da5e0494 TG |
531 | errout_dev: |
532 | if (err < 0 && modified && net_ratelimit()) | |
533 | printk(KERN_WARNING "A link change request failed with " | |
534 | "some changes comitted already. Interface %s may " | |
535 | "have been left with an inconsistent configuration, " | |
536 | "please check.\n", dev->name); | |
537 | ||
1da177e4 LT |
538 | if (send_addr_notify) |
539 | call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); | |
540 | ||
541 | dev_put(dev); | |
da5e0494 | 542 | errout: |
1da177e4 LT |
543 | return err; |
544 | } | |
545 | ||
b60c5115 | 546 | static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
711e2c33 | 547 | { |
b60c5115 TG |
548 | struct ifinfomsg *ifm; |
549 | struct nlattr *tb[IFLA_MAX+1]; | |
550 | struct net_device *dev = NULL; | |
551 | struct sk_buff *nskb; | |
552 | char *iw_buf = NULL, *iw = NULL; | |
711e2c33 | 553 | int iw_buf_len = 0; |
b60c5115 | 554 | int err, payload; |
711e2c33 | 555 | |
b60c5115 TG |
556 | err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); |
557 | if (err < 0) | |
558 | goto errout; | |
559 | ||
560 | ifm = nlmsg_data(nlh); | |
561 | if (ifm->ifi_index >= 0) { | |
711e2c33 | 562 | dev = dev_get_by_index(ifm->ifi_index); |
b60c5115 TG |
563 | if (dev == NULL) |
564 | return -ENODEV; | |
565 | } else | |
711e2c33 | 566 | return -EINVAL; |
711e2c33 | 567 | |
711e2c33 | 568 | |
b60c5115 TG |
569 | #ifdef CONFIG_NET_WIRELESS_RTNETLINK |
570 | if (tb[IFLA_WIRELESS]) { | |
711e2c33 JT |
571 | /* Call Wireless Extensions. We need to know the size before |
572 | * we can alloc. Various stuff checked in there... */ | |
b60c5115 TG |
573 | err = wireless_rtnetlink_get(dev, nla_data(tb[IFLA_WIRELESS]), |
574 | nla_len(tb[IFLA_WIRELESS]), | |
575 | &iw_buf, &iw_buf_len); | |
576 | if (err < 0) | |
577 | goto errout; | |
578 | ||
579 | iw += IW_EV_POINT_OFF; | |
711e2c33 JT |
580 | } |
581 | #endif /* CONFIG_NET_WIRELESS_RTNETLINK */ | |
582 | ||
b60c5115 TG |
583 | payload = NLMSG_ALIGN(sizeof(struct ifinfomsg) + |
584 | nla_total_size(iw_buf_len)); | |
585 | nskb = nlmsg_new(nlmsg_total_size(payload), GFP_KERNEL); | |
586 | if (nskb == NULL) { | |
587 | err = -ENOBUFS; | |
588 | goto errout; | |
589 | } | |
590 | ||
591 | err = rtnl_fill_ifinfo(nskb, dev, iw, iw_buf_len, RTM_NEWLINK, | |
592 | NETLINK_CB(skb).pid, nlh->nlmsg_seq, 0, 0); | |
593 | if (err <= 0) { | |
594 | kfree_skb(skb); | |
595 | goto errout; | |
596 | } | |
597 | ||
2942e900 | 598 | err = rtnl_unicast(skb, NETLINK_CB(skb).pid); |
b60c5115 TG |
599 | errout: |
600 | kfree(iw_buf); | |
711e2c33 | 601 | dev_put(dev); |
711e2c33 | 602 | |
b60c5115 | 603 | return err; |
711e2c33 | 604 | } |
711e2c33 | 605 | |
b60c5115 | 606 | static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb) |
1da177e4 LT |
607 | { |
608 | int idx; | |
609 | int s_idx = cb->family; | |
610 | ||
611 | if (s_idx == 0) | |
612 | s_idx = 1; | |
613 | for (idx=1; idx<NPROTO; idx++) { | |
614 | int type = cb->nlh->nlmsg_type-RTM_BASE; | |
615 | if (idx < s_idx || idx == PF_PACKET) | |
616 | continue; | |
617 | if (rtnetlink_links[idx] == NULL || | |
618 | rtnetlink_links[idx][type].dumpit == NULL) | |
619 | continue; | |
620 | if (idx > s_idx) | |
621 | memset(&cb->args[0], 0, sizeof(cb->args)); | |
622 | if (rtnetlink_links[idx][type].dumpit(skb, cb)) | |
623 | break; | |
624 | } | |
625 | cb->family = idx; | |
626 | ||
627 | return skb->len; | |
628 | } | |
629 | ||
630 | void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change) | |
631 | { | |
632 | struct sk_buff *skb; | |
633 | int size = NLMSG_SPACE(sizeof(struct ifinfomsg) + | |
634 | sizeof(struct rtnl_link_ifmap) + | |
635 | sizeof(struct rtnl_link_stats) + 128); | |
636 | ||
b60c5115 | 637 | skb = nlmsg_new(size, GFP_KERNEL); |
1da177e4 LT |
638 | if (!skb) |
639 | return; | |
640 | ||
b60c5115 | 641 | if (rtnl_fill_ifinfo(skb, dev, NULL, 0, type, 0, 0, change, 0) < 0) { |
1da177e4 LT |
642 | kfree_skb(skb); |
643 | return; | |
644 | } | |
ac6d439d PM |
645 | NETLINK_CB(skb).dst_group = RTNLGRP_LINK; |
646 | netlink_broadcast(rtnl, skb, 0, RTNLGRP_LINK, GFP_KERNEL); | |
1da177e4 LT |
647 | } |
648 | ||
1da177e4 LT |
649 | /* Protected by RTNL sempahore. */ |
650 | static struct rtattr **rta_buf; | |
651 | static int rtattr_max; | |
652 | ||
653 | /* Process one rtnetlink message. */ | |
654 | ||
655 | static __inline__ int | |
656 | rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, int *errp) | |
657 | { | |
658 | struct rtnetlink_link *link; | |
659 | struct rtnetlink_link *link_tab; | |
660 | int sz_idx, kind; | |
661 | int min_len; | |
662 | int family; | |
663 | int type; | |
664 | int err; | |
665 | ||
666 | /* Only requests are handled by kernel now */ | |
667 | if (!(nlh->nlmsg_flags&NLM_F_REQUEST)) | |
668 | return 0; | |
669 | ||
670 | type = nlh->nlmsg_type; | |
671 | ||
672 | /* A control message: ignore them */ | |
673 | if (type < RTM_BASE) | |
674 | return 0; | |
675 | ||
676 | /* Unknown message: reply with EINVAL */ | |
677 | if (type > RTM_MAX) | |
678 | goto err_inval; | |
679 | ||
680 | type -= RTM_BASE; | |
681 | ||
682 | /* All the messages must have at least 1 byte length */ | |
683 | if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg))) | |
684 | return 0; | |
685 | ||
686 | family = ((struct rtgenmsg*)NLMSG_DATA(nlh))->rtgen_family; | |
687 | if (family >= NPROTO) { | |
688 | *errp = -EAFNOSUPPORT; | |
689 | return -1; | |
690 | } | |
691 | ||
692 | link_tab = rtnetlink_links[family]; | |
693 | if (link_tab == NULL) | |
694 | link_tab = rtnetlink_links[PF_UNSPEC]; | |
695 | link = &link_tab[type]; | |
696 | ||
697 | sz_idx = type>>2; | |
698 | kind = type&3; | |
699 | ||
c7bdb545 | 700 | if (kind != 2 && security_netlink_recv(skb, CAP_NET_ADMIN)) { |
1da177e4 LT |
701 | *errp = -EPERM; |
702 | return -1; | |
703 | } | |
704 | ||
705 | if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) { | |
1da177e4 LT |
706 | if (link->dumpit == NULL) |
707 | link = &(rtnetlink_links[PF_UNSPEC][type]); | |
708 | ||
709 | if (link->dumpit == NULL) | |
710 | goto err_inval; | |
711 | ||
712 | if ((*errp = netlink_dump_start(rtnl, skb, nlh, | |
a8f74b22 | 713 | link->dumpit, NULL)) != 0) { |
1da177e4 LT |
714 | return -1; |
715 | } | |
9ac4a169 TG |
716 | |
717 | netlink_queue_skip(nlh, skb); | |
1da177e4 LT |
718 | return -1; |
719 | } | |
720 | ||
721 | memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *))); | |
722 | ||
723 | min_len = rtm_min[sz_idx]; | |
724 | if (nlh->nlmsg_len < min_len) | |
725 | goto err_inval; | |
726 | ||
727 | if (nlh->nlmsg_len > min_len) { | |
728 | int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len); | |
729 | struct rtattr *attr = (void*)nlh + NLMSG_ALIGN(min_len); | |
730 | ||
731 | while (RTA_OK(attr, attrlen)) { | |
732 | unsigned flavor = attr->rta_type; | |
733 | if (flavor) { | |
734 | if (flavor > rta_max[sz_idx]) | |
735 | goto err_inval; | |
736 | rta_buf[flavor-1] = attr; | |
737 | } | |
738 | attr = RTA_NEXT(attr, attrlen); | |
739 | } | |
740 | } | |
741 | ||
742 | if (link->doit == NULL) | |
743 | link = &(rtnetlink_links[PF_UNSPEC][type]); | |
744 | if (link->doit == NULL) | |
745 | goto err_inval; | |
746 | err = link->doit(skb, nlh, (void *)&rta_buf[0]); | |
747 | ||
748 | *errp = err; | |
749 | return err; | |
750 | ||
751 | err_inval: | |
752 | *errp = -EINVAL; | |
753 | return -1; | |
754 | } | |
755 | ||
1da177e4 LT |
756 | static void rtnetlink_rcv(struct sock *sk, int len) |
757 | { | |
9ac4a169 | 758 | unsigned int qlen = 0; |
2a0a6ebe | 759 | |
1da177e4 | 760 | do { |
6756ae4b | 761 | mutex_lock(&rtnl_mutex); |
9ac4a169 | 762 | netlink_run_queue(sk, &qlen, &rtnetlink_rcv_msg); |
6756ae4b | 763 | mutex_unlock(&rtnl_mutex); |
1da177e4 LT |
764 | |
765 | netdev_run_todo(); | |
2a0a6ebe | 766 | } while (qlen); |
1da177e4 LT |
767 | } |
768 | ||
db46edc6 | 769 | static struct rtnetlink_link link_rtnetlink_table[RTM_NR_MSGTYPES] = |
1da177e4 | 770 | { |
b60c5115 TG |
771 | [RTM_GETLINK - RTM_BASE] = { .doit = rtnl_getlink, |
772 | .dumpit = rtnl_dump_ifinfo }, | |
da5e0494 | 773 | [RTM_SETLINK - RTM_BASE] = { .doit = rtnl_setlink }, |
b60c5115 TG |
774 | [RTM_GETADDR - RTM_BASE] = { .dumpit = rtnl_dump_all }, |
775 | [RTM_GETROUTE - RTM_BASE] = { .dumpit = rtnl_dump_all }, | |
c7fb64db TG |
776 | [RTM_NEWNEIGH - RTM_BASE] = { .doit = neigh_add }, |
777 | [RTM_DELNEIGH - RTM_BASE] = { .doit = neigh_delete }, | |
778 | [RTM_GETNEIGH - RTM_BASE] = { .dumpit = neigh_dump_info }, | |
14c0b97d TG |
779 | #ifdef CONFIG_FIB_RULES |
780 | [RTM_NEWRULE - RTM_BASE] = { .doit = fib_nl_newrule }, | |
781 | [RTM_DELRULE - RTM_BASE] = { .doit = fib_nl_delrule }, | |
782 | #endif | |
b60c5115 | 783 | [RTM_GETRULE - RTM_BASE] = { .dumpit = rtnl_dump_all }, |
c7fb64db TG |
784 | [RTM_GETNEIGHTBL - RTM_BASE] = { .dumpit = neightbl_dump_info }, |
785 | [RTM_SETNEIGHTBL - RTM_BASE] = { .doit = neightbl_set }, | |
1da177e4 LT |
786 | }; |
787 | ||
788 | static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr) | |
789 | { | |
790 | struct net_device *dev = ptr; | |
791 | switch (event) { | |
792 | case NETDEV_UNREGISTER: | |
793 | rtmsg_ifinfo(RTM_DELLINK, dev, ~0U); | |
794 | break; | |
795 | case NETDEV_REGISTER: | |
796 | rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U); | |
797 | break; | |
798 | case NETDEV_UP: | |
799 | case NETDEV_DOWN: | |
800 | rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING); | |
801 | break; | |
802 | case NETDEV_CHANGE: | |
803 | case NETDEV_GOING_DOWN: | |
804 | break; | |
805 | default: | |
806 | rtmsg_ifinfo(RTM_NEWLINK, dev, 0); | |
807 | break; | |
808 | } | |
809 | return NOTIFY_DONE; | |
810 | } | |
811 | ||
812 | static struct notifier_block rtnetlink_dev_notifier = { | |
813 | .notifier_call = rtnetlink_event, | |
814 | }; | |
815 | ||
816 | void __init rtnetlink_init(void) | |
817 | { | |
818 | int i; | |
819 | ||
820 | rtattr_max = 0; | |
821 | for (i = 0; i < ARRAY_SIZE(rta_max); i++) | |
822 | if (rta_max[i] > rtattr_max) | |
823 | rtattr_max = rta_max[i]; | |
824 | rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL); | |
825 | if (!rta_buf) | |
826 | panic("rtnetlink_init: cannot allocate rta_buf\n"); | |
827 | ||
06628607 PM |
828 | rtnl = netlink_kernel_create(NETLINK_ROUTE, RTNLGRP_MAX, rtnetlink_rcv, |
829 | THIS_MODULE); | |
1da177e4 LT |
830 | if (rtnl == NULL) |
831 | panic("rtnetlink_init: cannot initialize rtnetlink\n"); | |
832 | netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV); | |
833 | register_netdevice_notifier(&rtnetlink_dev_notifier); | |
834 | rtnetlink_links[PF_UNSPEC] = link_rtnetlink_table; | |
835 | rtnetlink_links[PF_PACKET] = link_rtnetlink_table; | |
836 | } | |
837 | ||
838 | EXPORT_SYMBOL(__rta_fill); | |
839 | EXPORT_SYMBOL(rtattr_strlcpy); | |
840 | EXPORT_SYMBOL(rtattr_parse); | |
841 | EXPORT_SYMBOL(rtnetlink_links); | |
842 | EXPORT_SYMBOL(rtnetlink_put_metrics); | |
843 | EXPORT_SYMBOL(rtnl); | |
844 | EXPORT_SYMBOL(rtnl_lock); | |
6756ae4b | 845 | EXPORT_SYMBOL(rtnl_trylock); |
1da177e4 | 846 | EXPORT_SYMBOL(rtnl_unlock); |
2942e900 | 847 | EXPORT_SYMBOL(rtnl_unicast); |
97676b6b TG |
848 | EXPORT_SYMBOL(rtnl_notify); |
849 | EXPORT_SYMBOL(rtnl_set_sk_err); |