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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); |
56fc85ac | 61 | static struct sock *rtnl; |
1da177e4 LT |
62 | |
63 | void rtnl_lock(void) | |
64 | { | |
6756ae4b | 65 | mutex_lock(&rtnl_mutex); |
1da177e4 LT |
66 | } |
67 | ||
6756ae4b | 68 | void __rtnl_unlock(void) |
1da177e4 | 69 | { |
6756ae4b | 70 | mutex_unlock(&rtnl_mutex); |
1da177e4 | 71 | } |
6756ae4b | 72 | |
1da177e4 LT |
73 | void rtnl_unlock(void) |
74 | { | |
6756ae4b SH |
75 | mutex_unlock(&rtnl_mutex); |
76 | if (rtnl && rtnl->sk_receive_queue.qlen) | |
77 | rtnl->sk_data_ready(rtnl, 0); | |
1da177e4 LT |
78 | netdev_run_todo(); |
79 | } | |
80 | ||
6756ae4b SH |
81 | int rtnl_trylock(void) |
82 | { | |
83 | return mutex_trylock(&rtnl_mutex); | |
84 | } | |
85 | ||
1da177e4 LT |
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 | ||
1da177e4 LT |
99 | struct rtnetlink_link * rtnetlink_links[NPROTO]; |
100 | ||
db46edc6 | 101 | static const int rtm_min[RTM_NR_FAMILIES] = |
1da177e4 | 102 | { |
f90a0a74 TG |
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)), | |
14c0b97d | 106 | [RTM_FAM(RTM_NEWRULE)] = NLMSG_LENGTH(sizeof(struct fib_rule_hdr)), |
f90a0a74 TG |
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)), | |
1da177e4 LT |
114 | }; |
115 | ||
db46edc6 | 116 | static const int rta_max[RTM_NR_FAMILIES] = |
1da177e4 | 117 | { |
f90a0a74 TG |
118 | [RTM_FAM(RTM_NEWLINK)] = IFLA_MAX, |
119 | [RTM_FAM(RTM_NEWADDR)] = IFA_MAX, | |
120 | [RTM_FAM(RTM_NEWROUTE)] = RTA_MAX, | |
14c0b97d | 121 | [RTM_FAM(RTM_NEWRULE)] = FRA_MAX, |
f90a0a74 TG |
122 | [RTM_FAM(RTM_NEWQDISC)] = TCA_MAX, |
123 | [RTM_FAM(RTM_NEWTCLASS)] = TCA_MAX, | |
124 | [RTM_FAM(RTM_NEWTFILTER)] = TCA_MAX, | |
125 | [RTM_FAM(RTM_NEWACTION)] = TCAA_MAX, | |
1da177e4 LT |
126 | }; |
127 | ||
128 | void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const void *data) | |
129 | { | |
130 | struct rtattr *rta; | |
131 | int size = RTA_LENGTH(attrlen); | |
132 | ||
133 | rta = (struct rtattr*)skb_put(skb, RTA_ALIGN(size)); | |
134 | rta->rta_type = attrtype; | |
135 | rta->rta_len = size; | |
136 | memcpy(RTA_DATA(rta), data, attrlen); | |
b3563c4f | 137 | memset(RTA_DATA(rta) + attrlen, 0, RTA_ALIGN(size) - size); |
1da177e4 LT |
138 | } |
139 | ||
140 | size_t rtattr_strlcpy(char *dest, const struct rtattr *rta, size_t size) | |
141 | { | |
142 | size_t ret = RTA_PAYLOAD(rta); | |
143 | char *src = RTA_DATA(rta); | |
144 | ||
145 | if (ret > 0 && src[ret - 1] == '\0') | |
146 | ret--; | |
147 | if (size > 0) { | |
148 | size_t len = (ret >= size) ? size - 1 : ret; | |
149 | memset(dest, 0, size); | |
150 | memcpy(dest, src, len); | |
151 | } | |
152 | return ret; | |
153 | } | |
154 | ||
155 | int rtnetlink_send(struct sk_buff *skb, u32 pid, unsigned group, int echo) | |
156 | { | |
157 | int err = 0; | |
158 | ||
ac6d439d | 159 | NETLINK_CB(skb).dst_group = group; |
1da177e4 LT |
160 | if (echo) |
161 | atomic_inc(&skb->users); | |
162 | netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL); | |
163 | if (echo) | |
164 | err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT); | |
165 | return err; | |
166 | } | |
167 | ||
2942e900 TG |
168 | int rtnl_unicast(struct sk_buff *skb, u32 pid) |
169 | { | |
170 | return nlmsg_unicast(rtnl, skb, pid); | |
171 | } | |
172 | ||
97676b6b TG |
173 | int rtnl_notify(struct sk_buff *skb, u32 pid, u32 group, |
174 | struct nlmsghdr *nlh, gfp_t flags) | |
175 | { | |
176 | int report = 0; | |
177 | ||
178 | if (nlh) | |
179 | report = nlmsg_report(nlh); | |
180 | ||
181 | return nlmsg_notify(rtnl, skb, pid, group, report, flags); | |
182 | } | |
183 | ||
184 | void rtnl_set_sk_err(u32 group, int error) | |
185 | { | |
186 | netlink_set_err(rtnl, 0, group, error); | |
187 | } | |
188 | ||
1da177e4 LT |
189 | int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics) |
190 | { | |
2d7202bf TG |
191 | struct nlattr *mx; |
192 | int i, valid = 0; | |
193 | ||
194 | mx = nla_nest_start(skb, RTA_METRICS); | |
195 | if (mx == NULL) | |
196 | return -ENOBUFS; | |
197 | ||
198 | for (i = 0; i < RTAX_MAX; i++) { | |
199 | if (metrics[i]) { | |
200 | valid++; | |
201 | NLA_PUT_U32(skb, i+1, metrics[i]); | |
202 | } | |
1da177e4 | 203 | } |
1da177e4 | 204 | |
a57d27fc DM |
205 | if (!valid) { |
206 | nla_nest_cancel(skb, mx); | |
207 | return 0; | |
208 | } | |
2d7202bf TG |
209 | |
210 | return nla_nest_end(skb, mx); | |
211 | ||
212 | nla_put_failure: | |
213 | return nla_nest_cancel(skb, mx); | |
1da177e4 LT |
214 | } |
215 | ||
216 | ||
b00055aa SR |
217 | static void set_operstate(struct net_device *dev, unsigned char transition) |
218 | { | |
219 | unsigned char operstate = dev->operstate; | |
220 | ||
221 | switch(transition) { | |
222 | case IF_OPER_UP: | |
223 | if ((operstate == IF_OPER_DORMANT || | |
224 | operstate == IF_OPER_UNKNOWN) && | |
225 | !netif_dormant(dev)) | |
226 | operstate = IF_OPER_UP; | |
227 | break; | |
228 | ||
229 | case IF_OPER_DORMANT: | |
230 | if (operstate == IF_OPER_UP || | |
231 | operstate == IF_OPER_UNKNOWN) | |
232 | operstate = IF_OPER_DORMANT; | |
233 | break; | |
234 | }; | |
235 | ||
236 | if (dev->operstate != operstate) { | |
237 | write_lock_bh(&dev_base_lock); | |
238 | dev->operstate = operstate; | |
239 | write_unlock_bh(&dev_base_lock); | |
240 | netdev_state_change(dev); | |
241 | } | |
242 | } | |
243 | ||
b60c5115 TG |
244 | static void copy_rtnl_link_stats(struct rtnl_link_stats *a, |
245 | struct net_device_stats *b) | |
1da177e4 | 246 | { |
b60c5115 TG |
247 | a->rx_packets = b->rx_packets; |
248 | a->tx_packets = b->tx_packets; | |
249 | a->rx_bytes = b->rx_bytes; | |
250 | a->tx_bytes = b->tx_bytes; | |
251 | a->rx_errors = b->rx_errors; | |
252 | a->tx_errors = b->tx_errors; | |
253 | a->rx_dropped = b->rx_dropped; | |
254 | a->tx_dropped = b->tx_dropped; | |
255 | ||
256 | a->multicast = b->multicast; | |
257 | a->collisions = b->collisions; | |
258 | ||
259 | a->rx_length_errors = b->rx_length_errors; | |
260 | a->rx_over_errors = b->rx_over_errors; | |
261 | a->rx_crc_errors = b->rx_crc_errors; | |
262 | a->rx_frame_errors = b->rx_frame_errors; | |
263 | a->rx_fifo_errors = b->rx_fifo_errors; | |
264 | a->rx_missed_errors = b->rx_missed_errors; | |
265 | ||
266 | a->tx_aborted_errors = b->tx_aborted_errors; | |
267 | a->tx_carrier_errors = b->tx_carrier_errors; | |
268 | a->tx_fifo_errors = b->tx_fifo_errors; | |
269 | a->tx_heartbeat_errors = b->tx_heartbeat_errors; | |
270 | a->tx_window_errors = b->tx_window_errors; | |
271 | ||
272 | a->rx_compressed = b->rx_compressed; | |
273 | a->tx_compressed = b->tx_compressed; | |
274 | }; | |
1da177e4 | 275 | |
b60c5115 TG |
276 | static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev, |
277 | void *iwbuf, int iwbuflen, int type, u32 pid, | |
278 | u32 seq, u32 change, unsigned int flags) | |
279 | { | |
280 | struct ifinfomsg *ifm; | |
281 | struct nlmsghdr *nlh; | |
1da177e4 | 282 | |
b60c5115 TG |
283 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags); |
284 | if (nlh == NULL) | |
285 | return -ENOBUFS; | |
1da177e4 | 286 | |
b60c5115 TG |
287 | ifm = nlmsg_data(nlh); |
288 | ifm->ifi_family = AF_UNSPEC; | |
289 | ifm->__ifi_pad = 0; | |
290 | ifm->ifi_type = dev->type; | |
291 | ifm->ifi_index = dev->ifindex; | |
292 | ifm->ifi_flags = dev_get_flags(dev); | |
293 | ifm->ifi_change = change; | |
294 | ||
295 | NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name); | |
296 | NLA_PUT_U32(skb, IFLA_TXQLEN, dev->tx_queue_len); | |
297 | NLA_PUT_U32(skb, IFLA_WEIGHT, dev->weight); | |
298 | NLA_PUT_U8(skb, IFLA_OPERSTATE, | |
299 | netif_running(dev) ? dev->operstate : IF_OPER_DOWN); | |
300 | NLA_PUT_U8(skb, IFLA_LINKMODE, dev->link_mode); | |
301 | NLA_PUT_U32(skb, IFLA_MTU, dev->mtu); | |
302 | ||
303 | if (dev->ifindex != dev->iflink) | |
304 | NLA_PUT_U32(skb, IFLA_LINK, dev->iflink); | |
305 | ||
306 | if (dev->master) | |
307 | NLA_PUT_U32(skb, IFLA_MASTER, dev->master->ifindex); | |
1da177e4 | 308 | |
b60c5115 TG |
309 | if (dev->qdisc_sleeping) |
310 | NLA_PUT_STRING(skb, IFLA_QDISC, dev->qdisc_sleeping->ops->id); | |
b00055aa | 311 | |
1da177e4 LT |
312 | if (1) { |
313 | struct rtnl_link_ifmap map = { | |
314 | .mem_start = dev->mem_start, | |
315 | .mem_end = dev->mem_end, | |
316 | .base_addr = dev->base_addr, | |
317 | .irq = dev->irq, | |
318 | .dma = dev->dma, | |
319 | .port = dev->if_port, | |
320 | }; | |
b60c5115 | 321 | NLA_PUT(skb, IFLA_MAP, sizeof(map), &map); |
1da177e4 LT |
322 | } |
323 | ||
324 | if (dev->addr_len) { | |
b60c5115 TG |
325 | NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr); |
326 | NLA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast); | |
1da177e4 LT |
327 | } |
328 | ||
329 | if (dev->get_stats) { | |
b60c5115 | 330 | struct net_device_stats *stats = dev->get_stats(dev); |
1da177e4 | 331 | if (stats) { |
b60c5115 TG |
332 | struct nlattr *attr; |
333 | ||
334 | attr = nla_reserve(skb, IFLA_STATS, | |
335 | sizeof(struct rtnl_link_stats)); | |
336 | if (attr == NULL) | |
337 | goto nla_put_failure; | |
338 | ||
339 | copy_rtnl_link_stats(nla_data(attr), stats); | |
1da177e4 LT |
340 | } |
341 | } | |
1da177e4 | 342 | |
b60c5115 TG |
343 | if (iwbuf) |
344 | NLA_PUT(skb, IFLA_WIRELESS, iwbuflen, iwbuf); | |
345 | ||
346 | return nlmsg_end(skb, nlh); | |
347 | ||
348 | nla_put_failure: | |
349 | return nlmsg_cancel(skb, nlh); | |
1da177e4 LT |
350 | } |
351 | ||
b60c5115 | 352 | static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) |
1da177e4 LT |
353 | { |
354 | int idx; | |
355 | int s_idx = cb->args[0]; | |
356 | struct net_device *dev; | |
357 | ||
358 | read_lock(&dev_base_lock); | |
359 | for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) { | |
360 | if (idx < s_idx) | |
361 | continue; | |
b60c5115 TG |
362 | if (rtnl_fill_ifinfo(skb, dev, NULL, 0, RTM_NEWLINK, |
363 | NETLINK_CB(cb->skb).pid, | |
364 | cb->nlh->nlmsg_seq, 0, NLM_F_MULTI) <= 0) | |
1da177e4 LT |
365 | break; |
366 | } | |
367 | read_unlock(&dev_base_lock); | |
368 | cb->args[0] = idx; | |
369 | ||
370 | return skb->len; | |
371 | } | |
372 | ||
da5e0494 | 373 | static struct nla_policy ifla_policy[IFLA_MAX+1] __read_mostly = { |
5176f91e TG |
374 | [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 }, |
375 | [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) }, | |
da5e0494 TG |
376 | [IFLA_MTU] = { .type = NLA_U32 }, |
377 | [IFLA_TXQLEN] = { .type = NLA_U32 }, | |
378 | [IFLA_WEIGHT] = { .type = NLA_U32 }, | |
379 | [IFLA_OPERSTATE] = { .type = NLA_U8 }, | |
380 | [IFLA_LINKMODE] = { .type = NLA_U8 }, | |
381 | }; | |
382 | ||
383 | static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) | |
1da177e4 | 384 | { |
da5e0494 | 385 | struct ifinfomsg *ifm; |
1da177e4 | 386 | struct net_device *dev; |
da5e0494 TG |
387 | int err, send_addr_notify = 0, modified = 0; |
388 | struct nlattr *tb[IFLA_MAX+1]; | |
389 | char ifname[IFNAMSIZ]; | |
1da177e4 | 390 | |
da5e0494 TG |
391 | err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); |
392 | if (err < 0) | |
393 | goto errout; | |
394 | ||
5176f91e TG |
395 | if (tb[IFLA_IFNAME]) |
396 | nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); | |
78e5b891 PM |
397 | else |
398 | ifname[0] = '\0'; | |
da5e0494 TG |
399 | |
400 | err = -EINVAL; | |
401 | ifm = nlmsg_data(nlh); | |
1da177e4 LT |
402 | if (ifm->ifi_index >= 0) |
403 | dev = dev_get_by_index(ifm->ifi_index); | |
da5e0494 | 404 | else if (tb[IFLA_IFNAME]) |
1da177e4 | 405 | dev = dev_get_by_name(ifname); |
da5e0494 TG |
406 | else |
407 | goto errout; | |
1da177e4 | 408 | |
da5e0494 TG |
409 | if (dev == NULL) { |
410 | err = -ENODEV; | |
411 | goto errout; | |
412 | } | |
1da177e4 | 413 | |
da5e0494 TG |
414 | if (tb[IFLA_ADDRESS] && |
415 | nla_len(tb[IFLA_ADDRESS]) < dev->addr_len) | |
416 | goto errout_dev; | |
1da177e4 | 417 | |
da5e0494 TG |
418 | if (tb[IFLA_BROADCAST] && |
419 | nla_len(tb[IFLA_BROADCAST]) < dev->addr_len) | |
420 | goto errout_dev; | |
1da177e4 | 421 | |
da5e0494 | 422 | if (tb[IFLA_MAP]) { |
1da177e4 LT |
423 | struct rtnl_link_ifmap *u_map; |
424 | struct ifmap k_map; | |
425 | ||
426 | if (!dev->set_config) { | |
427 | err = -EOPNOTSUPP; | |
da5e0494 | 428 | goto errout_dev; |
1da177e4 LT |
429 | } |
430 | ||
431 | if (!netif_device_present(dev)) { | |
432 | err = -ENODEV; | |
da5e0494 | 433 | goto errout_dev; |
1da177e4 | 434 | } |
1da177e4 | 435 | |
da5e0494 | 436 | u_map = nla_data(tb[IFLA_MAP]); |
1da177e4 LT |
437 | k_map.mem_start = (unsigned long) u_map->mem_start; |
438 | k_map.mem_end = (unsigned long) u_map->mem_end; | |
439 | k_map.base_addr = (unsigned short) u_map->base_addr; | |
440 | k_map.irq = (unsigned char) u_map->irq; | |
441 | k_map.dma = (unsigned char) u_map->dma; | |
442 | k_map.port = (unsigned char) u_map->port; | |
443 | ||
444 | err = dev->set_config(dev, &k_map); | |
da5e0494 TG |
445 | if (err < 0) |
446 | goto errout_dev; | |
1da177e4 | 447 | |
da5e0494 | 448 | modified = 1; |
1da177e4 LT |
449 | } |
450 | ||
da5e0494 | 451 | if (tb[IFLA_ADDRESS]) { |
70f8e78e DM |
452 | struct sockaddr *sa; |
453 | int len; | |
454 | ||
1da177e4 LT |
455 | if (!dev->set_mac_address) { |
456 | err = -EOPNOTSUPP; | |
da5e0494 | 457 | goto errout_dev; |
1da177e4 | 458 | } |
da5e0494 | 459 | |
1da177e4 LT |
460 | if (!netif_device_present(dev)) { |
461 | err = -ENODEV; | |
da5e0494 | 462 | goto errout_dev; |
1da177e4 | 463 | } |
1da177e4 | 464 | |
70f8e78e DM |
465 | len = sizeof(sa_family_t) + dev->addr_len; |
466 | sa = kmalloc(len, GFP_KERNEL); | |
467 | if (!sa) { | |
468 | err = -ENOMEM; | |
da5e0494 | 469 | goto errout_dev; |
70f8e78e DM |
470 | } |
471 | sa->sa_family = dev->type; | |
da5e0494 | 472 | memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]), |
70f8e78e DM |
473 | dev->addr_len); |
474 | err = dev->set_mac_address(dev, sa); | |
475 | kfree(sa); | |
1da177e4 | 476 | if (err) |
da5e0494 | 477 | goto errout_dev; |
1da177e4 | 478 | send_addr_notify = 1; |
da5e0494 | 479 | modified = 1; |
1da177e4 LT |
480 | } |
481 | ||
da5e0494 TG |
482 | if (tb[IFLA_MTU]) { |
483 | err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU])); | |
484 | if (err < 0) | |
485 | goto errout_dev; | |
486 | modified = 1; | |
1da177e4 LT |
487 | } |
488 | ||
da5e0494 TG |
489 | /* |
490 | * Interface selected by interface index but interface | |
491 | * name provided implies that a name change has been | |
492 | * requested. | |
493 | */ | |
494 | if (ifm->ifi_index >= 0 && ifname[0]) { | |
495 | err = dev_change_name(dev, ifname); | |
496 | if (err < 0) | |
497 | goto errout_dev; | |
498 | modified = 1; | |
1da177e4 LT |
499 | } |
500 | ||
da5e0494 TG |
501 | #ifdef CONFIG_NET_WIRELESS_RTNETLINK |
502 | if (tb[IFLA_WIRELESS]) { | |
503 | /* Call Wireless Extensions. | |
504 | * Various stuff checked in there... */ | |
505 | err = wireless_rtnetlink_set(dev, nla_data(tb[IFLA_WIRELESS]), | |
506 | nla_len(tb[IFLA_WIRELESS])); | |
507 | if (err < 0) | |
508 | goto errout_dev; | |
509 | } | |
510 | #endif /* CONFIG_NET_WIRELESS_RTNETLINK */ | |
1da177e4 | 511 | |
da5e0494 TG |
512 | if (tb[IFLA_BROADCAST]) { |
513 | nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len); | |
514 | send_addr_notify = 1; | |
1da177e4 LT |
515 | } |
516 | ||
1da177e4 | 517 | |
da5e0494 TG |
518 | if (ifm->ifi_flags) |
519 | dev_change_flags(dev, ifm->ifi_flags); | |
1da177e4 | 520 | |
da5e0494 TG |
521 | if (tb[IFLA_TXQLEN]) |
522 | dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]); | |
b00055aa | 523 | |
da5e0494 TG |
524 | if (tb[IFLA_WEIGHT]) |
525 | dev->weight = nla_get_u32(tb[IFLA_WEIGHT]); | |
b00055aa | 526 | |
da5e0494 TG |
527 | if (tb[IFLA_OPERSTATE]) |
528 | set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); | |
b00055aa | 529 | |
da5e0494 | 530 | if (tb[IFLA_LINKMODE]) { |
b00055aa | 531 | write_lock_bh(&dev_base_lock); |
da5e0494 | 532 | dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]); |
b00055aa SR |
533 | write_unlock_bh(&dev_base_lock); |
534 | } | |
535 | ||
1da177e4 LT |
536 | err = 0; |
537 | ||
da5e0494 TG |
538 | errout_dev: |
539 | if (err < 0 && modified && net_ratelimit()) | |
540 | printk(KERN_WARNING "A link change request failed with " | |
541 | "some changes comitted already. Interface %s may " | |
542 | "have been left with an inconsistent configuration, " | |
543 | "please check.\n", dev->name); | |
544 | ||
1da177e4 LT |
545 | if (send_addr_notify) |
546 | call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); | |
547 | ||
548 | dev_put(dev); | |
da5e0494 | 549 | errout: |
1da177e4 LT |
550 | return err; |
551 | } | |
552 | ||
b60c5115 | 553 | static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
711e2c33 | 554 | { |
b60c5115 TG |
555 | struct ifinfomsg *ifm; |
556 | struct nlattr *tb[IFLA_MAX+1]; | |
557 | struct net_device *dev = NULL; | |
558 | struct sk_buff *nskb; | |
559 | char *iw_buf = NULL, *iw = NULL; | |
711e2c33 | 560 | int iw_buf_len = 0; |
b60c5115 | 561 | int err, payload; |
711e2c33 | 562 | |
b60c5115 TG |
563 | err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); |
564 | if (err < 0) | |
9918f230 | 565 | return err; |
b60c5115 TG |
566 | |
567 | ifm = nlmsg_data(nlh); | |
568 | if (ifm->ifi_index >= 0) { | |
711e2c33 | 569 | dev = dev_get_by_index(ifm->ifi_index); |
b60c5115 TG |
570 | if (dev == NULL) |
571 | return -ENODEV; | |
572 | } else | |
711e2c33 | 573 | return -EINVAL; |
711e2c33 | 574 | |
711e2c33 | 575 | |
b60c5115 TG |
576 | #ifdef CONFIG_NET_WIRELESS_RTNETLINK |
577 | if (tb[IFLA_WIRELESS]) { | |
711e2c33 JT |
578 | /* Call Wireless Extensions. We need to know the size before |
579 | * we can alloc. Various stuff checked in there... */ | |
b60c5115 TG |
580 | err = wireless_rtnetlink_get(dev, nla_data(tb[IFLA_WIRELESS]), |
581 | nla_len(tb[IFLA_WIRELESS]), | |
582 | &iw_buf, &iw_buf_len); | |
583 | if (err < 0) | |
584 | goto errout; | |
585 | ||
586 | iw += IW_EV_POINT_OFF; | |
711e2c33 JT |
587 | } |
588 | #endif /* CONFIG_NET_WIRELESS_RTNETLINK */ | |
589 | ||
b60c5115 TG |
590 | payload = NLMSG_ALIGN(sizeof(struct ifinfomsg) + |
591 | nla_total_size(iw_buf_len)); | |
592 | nskb = nlmsg_new(nlmsg_total_size(payload), GFP_KERNEL); | |
593 | if (nskb == NULL) { | |
594 | err = -ENOBUFS; | |
595 | goto errout; | |
596 | } | |
597 | ||
598 | err = rtnl_fill_ifinfo(nskb, dev, iw, iw_buf_len, RTM_NEWLINK, | |
599 | NETLINK_CB(skb).pid, nlh->nlmsg_seq, 0, 0); | |
600 | if (err <= 0) { | |
3015d5d4 | 601 | kfree_skb(nskb); |
b60c5115 TG |
602 | goto errout; |
603 | } | |
604 | ||
2942e900 | 605 | err = rtnl_unicast(skb, NETLINK_CB(skb).pid); |
b60c5115 TG |
606 | errout: |
607 | kfree(iw_buf); | |
711e2c33 | 608 | dev_put(dev); |
711e2c33 | 609 | |
b60c5115 | 610 | return err; |
711e2c33 | 611 | } |
711e2c33 | 612 | |
b60c5115 | 613 | static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb) |
1da177e4 LT |
614 | { |
615 | int idx; | |
616 | int s_idx = cb->family; | |
617 | ||
618 | if (s_idx == 0) | |
619 | s_idx = 1; | |
620 | for (idx=1; idx<NPROTO; idx++) { | |
621 | int type = cb->nlh->nlmsg_type-RTM_BASE; | |
622 | if (idx < s_idx || idx == PF_PACKET) | |
623 | continue; | |
624 | if (rtnetlink_links[idx] == NULL || | |
625 | rtnetlink_links[idx][type].dumpit == NULL) | |
626 | continue; | |
627 | if (idx > s_idx) | |
628 | memset(&cb->args[0], 0, sizeof(cb->args)); | |
629 | if (rtnetlink_links[idx][type].dumpit(skb, cb)) | |
630 | break; | |
631 | } | |
632 | cb->family = idx; | |
633 | ||
634 | return skb->len; | |
635 | } | |
636 | ||
637 | void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change) | |
638 | { | |
639 | struct sk_buff *skb; | |
0ec6d3f4 | 640 | int err = -ENOBUFS; |
1da177e4 | 641 | |
0ec6d3f4 TG |
642 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); |
643 | if (skb == NULL) | |
644 | goto errout; | |
1da177e4 | 645 | |
0ec6d3f4 TG |
646 | err = rtnl_fill_ifinfo(skb, dev, NULL, 0, type, 0, 0, change, 0); |
647 | if (err < 0) { | |
1da177e4 | 648 | kfree_skb(skb); |
0ec6d3f4 | 649 | goto errout; |
1da177e4 | 650 | } |
0ec6d3f4 TG |
651 | |
652 | err = rtnl_notify(skb, 0, RTNLGRP_LINK, NULL, GFP_KERNEL); | |
653 | errout: | |
654 | if (err < 0) | |
655 | rtnl_set_sk_err(RTNLGRP_LINK, err); | |
1da177e4 LT |
656 | } |
657 | ||
1da177e4 LT |
658 | /* Protected by RTNL sempahore. */ |
659 | static struct rtattr **rta_buf; | |
660 | static int rtattr_max; | |
661 | ||
662 | /* Process one rtnetlink message. */ | |
663 | ||
664 | static __inline__ int | |
665 | rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, int *errp) | |
666 | { | |
667 | struct rtnetlink_link *link; | |
668 | struct rtnetlink_link *link_tab; | |
669 | int sz_idx, kind; | |
670 | int min_len; | |
671 | int family; | |
672 | int type; | |
673 | int err; | |
674 | ||
675 | /* Only requests are handled by kernel now */ | |
676 | if (!(nlh->nlmsg_flags&NLM_F_REQUEST)) | |
677 | return 0; | |
678 | ||
679 | type = nlh->nlmsg_type; | |
680 | ||
681 | /* A control message: ignore them */ | |
682 | if (type < RTM_BASE) | |
683 | return 0; | |
684 | ||
685 | /* Unknown message: reply with EINVAL */ | |
686 | if (type > RTM_MAX) | |
687 | goto err_inval; | |
688 | ||
689 | type -= RTM_BASE; | |
690 | ||
691 | /* All the messages must have at least 1 byte length */ | |
692 | if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg))) | |
693 | return 0; | |
694 | ||
695 | family = ((struct rtgenmsg*)NLMSG_DATA(nlh))->rtgen_family; | |
696 | if (family >= NPROTO) { | |
697 | *errp = -EAFNOSUPPORT; | |
698 | return -1; | |
699 | } | |
700 | ||
701 | link_tab = rtnetlink_links[family]; | |
702 | if (link_tab == NULL) | |
703 | link_tab = rtnetlink_links[PF_UNSPEC]; | |
704 | link = &link_tab[type]; | |
705 | ||
706 | sz_idx = type>>2; | |
707 | kind = type&3; | |
708 | ||
c7bdb545 | 709 | if (kind != 2 && security_netlink_recv(skb, CAP_NET_ADMIN)) { |
1da177e4 LT |
710 | *errp = -EPERM; |
711 | return -1; | |
712 | } | |
713 | ||
714 | if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) { | |
1da177e4 LT |
715 | if (link->dumpit == NULL) |
716 | link = &(rtnetlink_links[PF_UNSPEC][type]); | |
717 | ||
718 | if (link->dumpit == NULL) | |
719 | goto err_inval; | |
720 | ||
721 | if ((*errp = netlink_dump_start(rtnl, skb, nlh, | |
a8f74b22 | 722 | link->dumpit, NULL)) != 0) { |
1da177e4 LT |
723 | return -1; |
724 | } | |
9ac4a169 TG |
725 | |
726 | netlink_queue_skip(nlh, skb); | |
1da177e4 LT |
727 | return -1; |
728 | } | |
729 | ||
730 | memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *))); | |
731 | ||
732 | min_len = rtm_min[sz_idx]; | |
733 | if (nlh->nlmsg_len < min_len) | |
734 | goto err_inval; | |
735 | ||
736 | if (nlh->nlmsg_len > min_len) { | |
737 | int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len); | |
738 | struct rtattr *attr = (void*)nlh + NLMSG_ALIGN(min_len); | |
739 | ||
740 | while (RTA_OK(attr, attrlen)) { | |
741 | unsigned flavor = attr->rta_type; | |
742 | if (flavor) { | |
743 | if (flavor > rta_max[sz_idx]) | |
744 | goto err_inval; | |
745 | rta_buf[flavor-1] = attr; | |
746 | } | |
747 | attr = RTA_NEXT(attr, attrlen); | |
748 | } | |
749 | } | |
750 | ||
751 | if (link->doit == NULL) | |
752 | link = &(rtnetlink_links[PF_UNSPEC][type]); | |
753 | if (link->doit == NULL) | |
754 | goto err_inval; | |
755 | err = link->doit(skb, nlh, (void *)&rta_buf[0]); | |
756 | ||
757 | *errp = err; | |
758 | return err; | |
759 | ||
760 | err_inval: | |
761 | *errp = -EINVAL; | |
762 | return -1; | |
763 | } | |
764 | ||
1da177e4 LT |
765 | static void rtnetlink_rcv(struct sock *sk, int len) |
766 | { | |
9ac4a169 | 767 | unsigned int qlen = 0; |
2a0a6ebe | 768 | |
1da177e4 | 769 | do { |
6756ae4b | 770 | mutex_lock(&rtnl_mutex); |
9ac4a169 | 771 | netlink_run_queue(sk, &qlen, &rtnetlink_rcv_msg); |
6756ae4b | 772 | mutex_unlock(&rtnl_mutex); |
1da177e4 LT |
773 | |
774 | netdev_run_todo(); | |
2a0a6ebe | 775 | } while (qlen); |
1da177e4 LT |
776 | } |
777 | ||
db46edc6 | 778 | static struct rtnetlink_link link_rtnetlink_table[RTM_NR_MSGTYPES] = |
1da177e4 | 779 | { |
b60c5115 TG |
780 | [RTM_GETLINK - RTM_BASE] = { .doit = rtnl_getlink, |
781 | .dumpit = rtnl_dump_ifinfo }, | |
da5e0494 | 782 | [RTM_SETLINK - RTM_BASE] = { .doit = rtnl_setlink }, |
b60c5115 TG |
783 | [RTM_GETADDR - RTM_BASE] = { .dumpit = rtnl_dump_all }, |
784 | [RTM_GETROUTE - RTM_BASE] = { .dumpit = rtnl_dump_all }, | |
c7fb64db TG |
785 | [RTM_NEWNEIGH - RTM_BASE] = { .doit = neigh_add }, |
786 | [RTM_DELNEIGH - RTM_BASE] = { .doit = neigh_delete }, | |
787 | [RTM_GETNEIGH - RTM_BASE] = { .dumpit = neigh_dump_info }, | |
14c0b97d TG |
788 | #ifdef CONFIG_FIB_RULES |
789 | [RTM_NEWRULE - RTM_BASE] = { .doit = fib_nl_newrule }, | |
790 | [RTM_DELRULE - RTM_BASE] = { .doit = fib_nl_delrule }, | |
791 | #endif | |
b60c5115 | 792 | [RTM_GETRULE - RTM_BASE] = { .dumpit = rtnl_dump_all }, |
c7fb64db TG |
793 | [RTM_GETNEIGHTBL - RTM_BASE] = { .dumpit = neightbl_dump_info }, |
794 | [RTM_SETNEIGHTBL - RTM_BASE] = { .doit = neightbl_set }, | |
1da177e4 LT |
795 | }; |
796 | ||
797 | static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr) | |
798 | { | |
799 | struct net_device *dev = ptr; | |
800 | switch (event) { | |
801 | case NETDEV_UNREGISTER: | |
802 | rtmsg_ifinfo(RTM_DELLINK, dev, ~0U); | |
803 | break; | |
804 | case NETDEV_REGISTER: | |
805 | rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U); | |
806 | break; | |
807 | case NETDEV_UP: | |
808 | case NETDEV_DOWN: | |
809 | rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING); | |
810 | break; | |
811 | case NETDEV_CHANGE: | |
812 | case NETDEV_GOING_DOWN: | |
813 | break; | |
814 | default: | |
815 | rtmsg_ifinfo(RTM_NEWLINK, dev, 0); | |
816 | break; | |
817 | } | |
818 | return NOTIFY_DONE; | |
819 | } | |
820 | ||
821 | static struct notifier_block rtnetlink_dev_notifier = { | |
822 | .notifier_call = rtnetlink_event, | |
823 | }; | |
824 | ||
825 | void __init rtnetlink_init(void) | |
826 | { | |
827 | int i; | |
828 | ||
829 | rtattr_max = 0; | |
830 | for (i = 0; i < ARRAY_SIZE(rta_max); i++) | |
831 | if (rta_max[i] > rtattr_max) | |
832 | rtattr_max = rta_max[i]; | |
833 | rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL); | |
834 | if (!rta_buf) | |
835 | panic("rtnetlink_init: cannot allocate rta_buf\n"); | |
836 | ||
06628607 PM |
837 | rtnl = netlink_kernel_create(NETLINK_ROUTE, RTNLGRP_MAX, rtnetlink_rcv, |
838 | THIS_MODULE); | |
1da177e4 LT |
839 | if (rtnl == NULL) |
840 | panic("rtnetlink_init: cannot initialize rtnetlink\n"); | |
841 | netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV); | |
842 | register_netdevice_notifier(&rtnetlink_dev_notifier); | |
843 | rtnetlink_links[PF_UNSPEC] = link_rtnetlink_table; | |
844 | rtnetlink_links[PF_PACKET] = link_rtnetlink_table; | |
845 | } | |
846 | ||
847 | EXPORT_SYMBOL(__rta_fill); | |
848 | EXPORT_SYMBOL(rtattr_strlcpy); | |
849 | EXPORT_SYMBOL(rtattr_parse); | |
850 | EXPORT_SYMBOL(rtnetlink_links); | |
851 | EXPORT_SYMBOL(rtnetlink_put_metrics); | |
1da177e4 | 852 | EXPORT_SYMBOL(rtnl_lock); |
6756ae4b | 853 | EXPORT_SYMBOL(rtnl_trylock); |
1da177e4 | 854 | EXPORT_SYMBOL(rtnl_unlock); |
2942e900 | 855 | EXPORT_SYMBOL(rtnl_unicast); |
97676b6b TG |
856 | EXPORT_SYMBOL(rtnl_notify); |
857 | EXPORT_SYMBOL(rtnl_set_sk_err); |