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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 | |
339bf98f TG |
276 | static inline size_t if_nlmsg_size(int iwbuflen) |
277 | { | |
278 | return NLMSG_ALIGN(sizeof(struct ifinfomsg)) | |
279 | + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ | |
280 | + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */ | |
281 | + nla_total_size(sizeof(struct rtnl_link_ifmap)) | |
282 | + nla_total_size(sizeof(struct rtnl_link_stats)) | |
283 | + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ | |
284 | + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */ | |
285 | + nla_total_size(4) /* IFLA_TXQLEN */ | |
286 | + nla_total_size(4) /* IFLA_WEIGHT */ | |
287 | + nla_total_size(4) /* IFLA_MTU */ | |
288 | + nla_total_size(4) /* IFLA_LINK */ | |
289 | + nla_total_size(4) /* IFLA_MASTER */ | |
290 | + nla_total_size(1) /* IFLA_OPERSTATE */ | |
291 | + nla_total_size(1) /* IFLA_LINKMODE */ | |
292 | + nla_total_size(iwbuflen); | |
293 | } | |
294 | ||
b60c5115 TG |
295 | static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev, |
296 | void *iwbuf, int iwbuflen, int type, u32 pid, | |
297 | u32 seq, u32 change, unsigned int flags) | |
298 | { | |
299 | struct ifinfomsg *ifm; | |
300 | struct nlmsghdr *nlh; | |
1da177e4 | 301 | |
b60c5115 TG |
302 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags); |
303 | if (nlh == NULL) | |
304 | return -ENOBUFS; | |
1da177e4 | 305 | |
b60c5115 TG |
306 | ifm = nlmsg_data(nlh); |
307 | ifm->ifi_family = AF_UNSPEC; | |
308 | ifm->__ifi_pad = 0; | |
309 | ifm->ifi_type = dev->type; | |
310 | ifm->ifi_index = dev->ifindex; | |
311 | ifm->ifi_flags = dev_get_flags(dev); | |
312 | ifm->ifi_change = change; | |
313 | ||
314 | NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name); | |
315 | NLA_PUT_U32(skb, IFLA_TXQLEN, dev->tx_queue_len); | |
316 | NLA_PUT_U32(skb, IFLA_WEIGHT, dev->weight); | |
317 | NLA_PUT_U8(skb, IFLA_OPERSTATE, | |
318 | netif_running(dev) ? dev->operstate : IF_OPER_DOWN); | |
319 | NLA_PUT_U8(skb, IFLA_LINKMODE, dev->link_mode); | |
320 | NLA_PUT_U32(skb, IFLA_MTU, dev->mtu); | |
321 | ||
322 | if (dev->ifindex != dev->iflink) | |
323 | NLA_PUT_U32(skb, IFLA_LINK, dev->iflink); | |
324 | ||
325 | if (dev->master) | |
326 | NLA_PUT_U32(skb, IFLA_MASTER, dev->master->ifindex); | |
1da177e4 | 327 | |
b60c5115 TG |
328 | if (dev->qdisc_sleeping) |
329 | NLA_PUT_STRING(skb, IFLA_QDISC, dev->qdisc_sleeping->ops->id); | |
b00055aa | 330 | |
1da177e4 LT |
331 | if (1) { |
332 | struct rtnl_link_ifmap map = { | |
333 | .mem_start = dev->mem_start, | |
334 | .mem_end = dev->mem_end, | |
335 | .base_addr = dev->base_addr, | |
336 | .irq = dev->irq, | |
337 | .dma = dev->dma, | |
338 | .port = dev->if_port, | |
339 | }; | |
b60c5115 | 340 | NLA_PUT(skb, IFLA_MAP, sizeof(map), &map); |
1da177e4 LT |
341 | } |
342 | ||
343 | if (dev->addr_len) { | |
b60c5115 TG |
344 | NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr); |
345 | NLA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast); | |
1da177e4 LT |
346 | } |
347 | ||
348 | if (dev->get_stats) { | |
b60c5115 | 349 | struct net_device_stats *stats = dev->get_stats(dev); |
1da177e4 | 350 | if (stats) { |
b60c5115 TG |
351 | struct nlattr *attr; |
352 | ||
353 | attr = nla_reserve(skb, IFLA_STATS, | |
354 | sizeof(struct rtnl_link_stats)); | |
355 | if (attr == NULL) | |
356 | goto nla_put_failure; | |
357 | ||
358 | copy_rtnl_link_stats(nla_data(attr), stats); | |
1da177e4 LT |
359 | } |
360 | } | |
1da177e4 | 361 | |
b60c5115 TG |
362 | if (iwbuf) |
363 | NLA_PUT(skb, IFLA_WIRELESS, iwbuflen, iwbuf); | |
364 | ||
365 | return nlmsg_end(skb, nlh); | |
366 | ||
367 | nla_put_failure: | |
368 | return nlmsg_cancel(skb, nlh); | |
1da177e4 LT |
369 | } |
370 | ||
b60c5115 | 371 | static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) |
1da177e4 LT |
372 | { |
373 | int idx; | |
374 | int s_idx = cb->args[0]; | |
375 | struct net_device *dev; | |
376 | ||
377 | read_lock(&dev_base_lock); | |
378 | for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) { | |
379 | if (idx < s_idx) | |
380 | continue; | |
b60c5115 TG |
381 | if (rtnl_fill_ifinfo(skb, dev, NULL, 0, RTM_NEWLINK, |
382 | NETLINK_CB(cb->skb).pid, | |
383 | cb->nlh->nlmsg_seq, 0, NLM_F_MULTI) <= 0) | |
1da177e4 LT |
384 | break; |
385 | } | |
386 | read_unlock(&dev_base_lock); | |
387 | cb->args[0] = idx; | |
388 | ||
389 | return skb->len; | |
390 | } | |
391 | ||
da5e0494 | 392 | static struct nla_policy ifla_policy[IFLA_MAX+1] __read_mostly = { |
5176f91e TG |
393 | [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 }, |
394 | [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) }, | |
da5e0494 TG |
395 | [IFLA_MTU] = { .type = NLA_U32 }, |
396 | [IFLA_TXQLEN] = { .type = NLA_U32 }, | |
397 | [IFLA_WEIGHT] = { .type = NLA_U32 }, | |
398 | [IFLA_OPERSTATE] = { .type = NLA_U8 }, | |
399 | [IFLA_LINKMODE] = { .type = NLA_U8 }, | |
400 | }; | |
401 | ||
402 | static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) | |
1da177e4 | 403 | { |
da5e0494 | 404 | struct ifinfomsg *ifm; |
1da177e4 | 405 | struct net_device *dev; |
da5e0494 TG |
406 | int err, send_addr_notify = 0, modified = 0; |
407 | struct nlattr *tb[IFLA_MAX+1]; | |
408 | char ifname[IFNAMSIZ]; | |
1da177e4 | 409 | |
da5e0494 TG |
410 | err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); |
411 | if (err < 0) | |
412 | goto errout; | |
413 | ||
5176f91e TG |
414 | if (tb[IFLA_IFNAME]) |
415 | nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ); | |
78e5b891 PM |
416 | else |
417 | ifname[0] = '\0'; | |
da5e0494 TG |
418 | |
419 | err = -EINVAL; | |
420 | ifm = nlmsg_data(nlh); | |
1da177e4 LT |
421 | if (ifm->ifi_index >= 0) |
422 | dev = dev_get_by_index(ifm->ifi_index); | |
da5e0494 | 423 | else if (tb[IFLA_IFNAME]) |
1da177e4 | 424 | dev = dev_get_by_name(ifname); |
da5e0494 TG |
425 | else |
426 | goto errout; | |
1da177e4 | 427 | |
da5e0494 TG |
428 | if (dev == NULL) { |
429 | err = -ENODEV; | |
430 | goto errout; | |
431 | } | |
1da177e4 | 432 | |
da5e0494 TG |
433 | if (tb[IFLA_ADDRESS] && |
434 | nla_len(tb[IFLA_ADDRESS]) < dev->addr_len) | |
435 | goto errout_dev; | |
1da177e4 | 436 | |
da5e0494 TG |
437 | if (tb[IFLA_BROADCAST] && |
438 | nla_len(tb[IFLA_BROADCAST]) < dev->addr_len) | |
439 | goto errout_dev; | |
1da177e4 | 440 | |
da5e0494 | 441 | if (tb[IFLA_MAP]) { |
1da177e4 LT |
442 | struct rtnl_link_ifmap *u_map; |
443 | struct ifmap k_map; | |
444 | ||
445 | if (!dev->set_config) { | |
446 | err = -EOPNOTSUPP; | |
da5e0494 | 447 | goto errout_dev; |
1da177e4 LT |
448 | } |
449 | ||
450 | if (!netif_device_present(dev)) { | |
451 | err = -ENODEV; | |
da5e0494 | 452 | goto errout_dev; |
1da177e4 | 453 | } |
1da177e4 | 454 | |
da5e0494 | 455 | u_map = nla_data(tb[IFLA_MAP]); |
1da177e4 LT |
456 | k_map.mem_start = (unsigned long) u_map->mem_start; |
457 | k_map.mem_end = (unsigned long) u_map->mem_end; | |
458 | k_map.base_addr = (unsigned short) u_map->base_addr; | |
459 | k_map.irq = (unsigned char) u_map->irq; | |
460 | k_map.dma = (unsigned char) u_map->dma; | |
461 | k_map.port = (unsigned char) u_map->port; | |
462 | ||
463 | err = dev->set_config(dev, &k_map); | |
da5e0494 TG |
464 | if (err < 0) |
465 | goto errout_dev; | |
1da177e4 | 466 | |
da5e0494 | 467 | modified = 1; |
1da177e4 LT |
468 | } |
469 | ||
da5e0494 | 470 | if (tb[IFLA_ADDRESS]) { |
70f8e78e DM |
471 | struct sockaddr *sa; |
472 | int len; | |
473 | ||
1da177e4 LT |
474 | if (!dev->set_mac_address) { |
475 | err = -EOPNOTSUPP; | |
da5e0494 | 476 | goto errout_dev; |
1da177e4 | 477 | } |
da5e0494 | 478 | |
1da177e4 LT |
479 | if (!netif_device_present(dev)) { |
480 | err = -ENODEV; | |
da5e0494 | 481 | goto errout_dev; |
1da177e4 | 482 | } |
1da177e4 | 483 | |
70f8e78e DM |
484 | len = sizeof(sa_family_t) + dev->addr_len; |
485 | sa = kmalloc(len, GFP_KERNEL); | |
486 | if (!sa) { | |
487 | err = -ENOMEM; | |
da5e0494 | 488 | goto errout_dev; |
70f8e78e DM |
489 | } |
490 | sa->sa_family = dev->type; | |
da5e0494 | 491 | memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]), |
70f8e78e DM |
492 | dev->addr_len); |
493 | err = dev->set_mac_address(dev, sa); | |
494 | kfree(sa); | |
1da177e4 | 495 | if (err) |
da5e0494 | 496 | goto errout_dev; |
1da177e4 | 497 | send_addr_notify = 1; |
da5e0494 | 498 | modified = 1; |
1da177e4 LT |
499 | } |
500 | ||
da5e0494 TG |
501 | if (tb[IFLA_MTU]) { |
502 | err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU])); | |
503 | if (err < 0) | |
504 | goto errout_dev; | |
505 | modified = 1; | |
1da177e4 LT |
506 | } |
507 | ||
da5e0494 TG |
508 | /* |
509 | * Interface selected by interface index but interface | |
510 | * name provided implies that a name change has been | |
511 | * requested. | |
512 | */ | |
513 | if (ifm->ifi_index >= 0 && ifname[0]) { | |
514 | err = dev_change_name(dev, ifname); | |
515 | if (err < 0) | |
516 | goto errout_dev; | |
517 | modified = 1; | |
1da177e4 LT |
518 | } |
519 | ||
da5e0494 TG |
520 | #ifdef CONFIG_NET_WIRELESS_RTNETLINK |
521 | if (tb[IFLA_WIRELESS]) { | |
522 | /* Call Wireless Extensions. | |
523 | * Various stuff checked in there... */ | |
524 | err = wireless_rtnetlink_set(dev, nla_data(tb[IFLA_WIRELESS]), | |
525 | nla_len(tb[IFLA_WIRELESS])); | |
526 | if (err < 0) | |
527 | goto errout_dev; | |
528 | } | |
529 | #endif /* CONFIG_NET_WIRELESS_RTNETLINK */ | |
1da177e4 | 530 | |
da5e0494 TG |
531 | if (tb[IFLA_BROADCAST]) { |
532 | nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len); | |
533 | send_addr_notify = 1; | |
1da177e4 LT |
534 | } |
535 | ||
1da177e4 | 536 | |
da5e0494 TG |
537 | if (ifm->ifi_flags) |
538 | dev_change_flags(dev, ifm->ifi_flags); | |
1da177e4 | 539 | |
da5e0494 TG |
540 | if (tb[IFLA_TXQLEN]) |
541 | dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]); | |
b00055aa | 542 | |
da5e0494 TG |
543 | if (tb[IFLA_WEIGHT]) |
544 | dev->weight = nla_get_u32(tb[IFLA_WEIGHT]); | |
b00055aa | 545 | |
da5e0494 TG |
546 | if (tb[IFLA_OPERSTATE]) |
547 | set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); | |
b00055aa | 548 | |
da5e0494 | 549 | if (tb[IFLA_LINKMODE]) { |
b00055aa | 550 | write_lock_bh(&dev_base_lock); |
da5e0494 | 551 | dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]); |
b00055aa SR |
552 | write_unlock_bh(&dev_base_lock); |
553 | } | |
554 | ||
1da177e4 LT |
555 | err = 0; |
556 | ||
da5e0494 TG |
557 | errout_dev: |
558 | if (err < 0 && modified && net_ratelimit()) | |
559 | printk(KERN_WARNING "A link change request failed with " | |
560 | "some changes comitted already. Interface %s may " | |
561 | "have been left with an inconsistent configuration, " | |
562 | "please check.\n", dev->name); | |
563 | ||
1da177e4 LT |
564 | if (send_addr_notify) |
565 | call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); | |
566 | ||
567 | dev_put(dev); | |
da5e0494 | 568 | errout: |
1da177e4 LT |
569 | return err; |
570 | } | |
571 | ||
b60c5115 | 572 | static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
711e2c33 | 573 | { |
b60c5115 TG |
574 | struct ifinfomsg *ifm; |
575 | struct nlattr *tb[IFLA_MAX+1]; | |
576 | struct net_device *dev = NULL; | |
577 | struct sk_buff *nskb; | |
578 | char *iw_buf = NULL, *iw = NULL; | |
711e2c33 | 579 | int iw_buf_len = 0; |
339bf98f | 580 | int err; |
711e2c33 | 581 | |
b60c5115 TG |
582 | err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); |
583 | if (err < 0) | |
9918f230 | 584 | return err; |
b60c5115 TG |
585 | |
586 | ifm = nlmsg_data(nlh); | |
587 | if (ifm->ifi_index >= 0) { | |
711e2c33 | 588 | dev = dev_get_by_index(ifm->ifi_index); |
b60c5115 TG |
589 | if (dev == NULL) |
590 | return -ENODEV; | |
591 | } else | |
711e2c33 | 592 | return -EINVAL; |
711e2c33 | 593 | |
711e2c33 | 594 | |
b60c5115 TG |
595 | #ifdef CONFIG_NET_WIRELESS_RTNETLINK |
596 | if (tb[IFLA_WIRELESS]) { | |
711e2c33 JT |
597 | /* Call Wireless Extensions. We need to know the size before |
598 | * we can alloc. Various stuff checked in there... */ | |
b60c5115 TG |
599 | err = wireless_rtnetlink_get(dev, nla_data(tb[IFLA_WIRELESS]), |
600 | nla_len(tb[IFLA_WIRELESS]), | |
601 | &iw_buf, &iw_buf_len); | |
602 | if (err < 0) | |
603 | goto errout; | |
604 | ||
605 | iw += IW_EV_POINT_OFF; | |
711e2c33 JT |
606 | } |
607 | #endif /* CONFIG_NET_WIRELESS_RTNETLINK */ | |
608 | ||
339bf98f | 609 | nskb = nlmsg_new(if_nlmsg_size(iw_buf_len), GFP_KERNEL); |
b60c5115 TG |
610 | if (nskb == NULL) { |
611 | err = -ENOBUFS; | |
612 | goto errout; | |
613 | } | |
614 | ||
615 | err = rtnl_fill_ifinfo(nskb, dev, iw, iw_buf_len, RTM_NEWLINK, | |
616 | NETLINK_CB(skb).pid, nlh->nlmsg_seq, 0, 0); | |
339bf98f TG |
617 | /* failure impilies BUG in if_nlmsg_size or wireless_rtnetlink_get */ |
618 | BUG_ON(err < 0); | |
b60c5115 | 619 | |
b974179a | 620 | err = rtnl_unicast(nskb, NETLINK_CB(skb).pid); |
b60c5115 TG |
621 | errout: |
622 | kfree(iw_buf); | |
711e2c33 | 623 | dev_put(dev); |
711e2c33 | 624 | |
b60c5115 | 625 | return err; |
711e2c33 | 626 | } |
711e2c33 | 627 | |
b60c5115 | 628 | static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb) |
1da177e4 LT |
629 | { |
630 | int idx; | |
631 | int s_idx = cb->family; | |
632 | ||
633 | if (s_idx == 0) | |
634 | s_idx = 1; | |
635 | for (idx=1; idx<NPROTO; idx++) { | |
636 | int type = cb->nlh->nlmsg_type-RTM_BASE; | |
637 | if (idx < s_idx || idx == PF_PACKET) | |
638 | continue; | |
639 | if (rtnetlink_links[idx] == NULL || | |
640 | rtnetlink_links[idx][type].dumpit == NULL) | |
641 | continue; | |
642 | if (idx > s_idx) | |
643 | memset(&cb->args[0], 0, sizeof(cb->args)); | |
644 | if (rtnetlink_links[idx][type].dumpit(skb, cb)) | |
645 | break; | |
646 | } | |
647 | cb->family = idx; | |
648 | ||
649 | return skb->len; | |
650 | } | |
651 | ||
652 | void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change) | |
653 | { | |
654 | struct sk_buff *skb; | |
0ec6d3f4 | 655 | int err = -ENOBUFS; |
1da177e4 | 656 | |
339bf98f | 657 | skb = nlmsg_new(if_nlmsg_size(0), GFP_KERNEL); |
0ec6d3f4 TG |
658 | if (skb == NULL) |
659 | goto errout; | |
1da177e4 | 660 | |
0ec6d3f4 | 661 | err = rtnl_fill_ifinfo(skb, dev, NULL, 0, type, 0, 0, change, 0); |
339bf98f TG |
662 | /* failure implies BUG in if_nlmsg_size() */ |
663 | BUG_ON(err < 0); | |
0ec6d3f4 TG |
664 | |
665 | err = rtnl_notify(skb, 0, RTNLGRP_LINK, NULL, GFP_KERNEL); | |
666 | errout: | |
667 | if (err < 0) | |
668 | rtnl_set_sk_err(RTNLGRP_LINK, err); | |
1da177e4 LT |
669 | } |
670 | ||
1da177e4 LT |
671 | /* Protected by RTNL sempahore. */ |
672 | static struct rtattr **rta_buf; | |
673 | static int rtattr_max; | |
674 | ||
675 | /* Process one rtnetlink message. */ | |
676 | ||
677 | static __inline__ int | |
678 | rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, int *errp) | |
679 | { | |
680 | struct rtnetlink_link *link; | |
681 | struct rtnetlink_link *link_tab; | |
682 | int sz_idx, kind; | |
683 | int min_len; | |
684 | int family; | |
685 | int type; | |
686 | int err; | |
687 | ||
688 | /* Only requests are handled by kernel now */ | |
689 | if (!(nlh->nlmsg_flags&NLM_F_REQUEST)) | |
690 | return 0; | |
691 | ||
692 | type = nlh->nlmsg_type; | |
693 | ||
694 | /* A control message: ignore them */ | |
695 | if (type < RTM_BASE) | |
696 | return 0; | |
697 | ||
698 | /* Unknown message: reply with EINVAL */ | |
699 | if (type > RTM_MAX) | |
700 | goto err_inval; | |
701 | ||
702 | type -= RTM_BASE; | |
703 | ||
704 | /* All the messages must have at least 1 byte length */ | |
705 | if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg))) | |
706 | return 0; | |
707 | ||
708 | family = ((struct rtgenmsg*)NLMSG_DATA(nlh))->rtgen_family; | |
709 | if (family >= NPROTO) { | |
710 | *errp = -EAFNOSUPPORT; | |
711 | return -1; | |
712 | } | |
713 | ||
714 | link_tab = rtnetlink_links[family]; | |
715 | if (link_tab == NULL) | |
716 | link_tab = rtnetlink_links[PF_UNSPEC]; | |
717 | link = &link_tab[type]; | |
718 | ||
719 | sz_idx = type>>2; | |
720 | kind = type&3; | |
721 | ||
c7bdb545 | 722 | if (kind != 2 && security_netlink_recv(skb, CAP_NET_ADMIN)) { |
1da177e4 LT |
723 | *errp = -EPERM; |
724 | return -1; | |
725 | } | |
726 | ||
727 | if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) { | |
1da177e4 LT |
728 | if (link->dumpit == NULL) |
729 | link = &(rtnetlink_links[PF_UNSPEC][type]); | |
730 | ||
731 | if (link->dumpit == NULL) | |
732 | goto err_inval; | |
733 | ||
734 | if ((*errp = netlink_dump_start(rtnl, skb, nlh, | |
a8f74b22 | 735 | link->dumpit, NULL)) != 0) { |
1da177e4 LT |
736 | return -1; |
737 | } | |
9ac4a169 TG |
738 | |
739 | netlink_queue_skip(nlh, skb); | |
1da177e4 LT |
740 | return -1; |
741 | } | |
742 | ||
743 | memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *))); | |
744 | ||
745 | min_len = rtm_min[sz_idx]; | |
746 | if (nlh->nlmsg_len < min_len) | |
747 | goto err_inval; | |
748 | ||
749 | if (nlh->nlmsg_len > min_len) { | |
750 | int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len); | |
751 | struct rtattr *attr = (void*)nlh + NLMSG_ALIGN(min_len); | |
752 | ||
753 | while (RTA_OK(attr, attrlen)) { | |
754 | unsigned flavor = attr->rta_type; | |
755 | if (flavor) { | |
756 | if (flavor > rta_max[sz_idx]) | |
757 | goto err_inval; | |
758 | rta_buf[flavor-1] = attr; | |
759 | } | |
760 | attr = RTA_NEXT(attr, attrlen); | |
761 | } | |
762 | } | |
763 | ||
764 | if (link->doit == NULL) | |
765 | link = &(rtnetlink_links[PF_UNSPEC][type]); | |
766 | if (link->doit == NULL) | |
767 | goto err_inval; | |
768 | err = link->doit(skb, nlh, (void *)&rta_buf[0]); | |
769 | ||
770 | *errp = err; | |
771 | return err; | |
772 | ||
773 | err_inval: | |
774 | *errp = -EINVAL; | |
775 | return -1; | |
776 | } | |
777 | ||
1da177e4 LT |
778 | static void rtnetlink_rcv(struct sock *sk, int len) |
779 | { | |
9ac4a169 | 780 | unsigned int qlen = 0; |
2a0a6ebe | 781 | |
1da177e4 | 782 | do { |
6756ae4b | 783 | mutex_lock(&rtnl_mutex); |
9ac4a169 | 784 | netlink_run_queue(sk, &qlen, &rtnetlink_rcv_msg); |
6756ae4b | 785 | mutex_unlock(&rtnl_mutex); |
1da177e4 LT |
786 | |
787 | netdev_run_todo(); | |
2a0a6ebe | 788 | } while (qlen); |
1da177e4 LT |
789 | } |
790 | ||
db46edc6 | 791 | static struct rtnetlink_link link_rtnetlink_table[RTM_NR_MSGTYPES] = |
1da177e4 | 792 | { |
b60c5115 TG |
793 | [RTM_GETLINK - RTM_BASE] = { .doit = rtnl_getlink, |
794 | .dumpit = rtnl_dump_ifinfo }, | |
da5e0494 | 795 | [RTM_SETLINK - RTM_BASE] = { .doit = rtnl_setlink }, |
b60c5115 TG |
796 | [RTM_GETADDR - RTM_BASE] = { .dumpit = rtnl_dump_all }, |
797 | [RTM_GETROUTE - RTM_BASE] = { .dumpit = rtnl_dump_all }, | |
c7fb64db TG |
798 | [RTM_NEWNEIGH - RTM_BASE] = { .doit = neigh_add }, |
799 | [RTM_DELNEIGH - RTM_BASE] = { .doit = neigh_delete }, | |
800 | [RTM_GETNEIGH - RTM_BASE] = { .dumpit = neigh_dump_info }, | |
14c0b97d TG |
801 | #ifdef CONFIG_FIB_RULES |
802 | [RTM_NEWRULE - RTM_BASE] = { .doit = fib_nl_newrule }, | |
803 | [RTM_DELRULE - RTM_BASE] = { .doit = fib_nl_delrule }, | |
804 | #endif | |
b60c5115 | 805 | [RTM_GETRULE - RTM_BASE] = { .dumpit = rtnl_dump_all }, |
c7fb64db TG |
806 | [RTM_GETNEIGHTBL - RTM_BASE] = { .dumpit = neightbl_dump_info }, |
807 | [RTM_SETNEIGHTBL - RTM_BASE] = { .doit = neightbl_set }, | |
1da177e4 LT |
808 | }; |
809 | ||
810 | static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr) | |
811 | { | |
812 | struct net_device *dev = ptr; | |
813 | switch (event) { | |
814 | case NETDEV_UNREGISTER: | |
815 | rtmsg_ifinfo(RTM_DELLINK, dev, ~0U); | |
816 | break; | |
817 | case NETDEV_REGISTER: | |
818 | rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U); | |
819 | break; | |
820 | case NETDEV_UP: | |
821 | case NETDEV_DOWN: | |
822 | rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING); | |
823 | break; | |
824 | case NETDEV_CHANGE: | |
825 | case NETDEV_GOING_DOWN: | |
826 | break; | |
827 | default: | |
828 | rtmsg_ifinfo(RTM_NEWLINK, dev, 0); | |
829 | break; | |
830 | } | |
831 | return NOTIFY_DONE; | |
832 | } | |
833 | ||
834 | static struct notifier_block rtnetlink_dev_notifier = { | |
835 | .notifier_call = rtnetlink_event, | |
836 | }; | |
837 | ||
838 | void __init rtnetlink_init(void) | |
839 | { | |
840 | int i; | |
841 | ||
842 | rtattr_max = 0; | |
843 | for (i = 0; i < ARRAY_SIZE(rta_max); i++) | |
844 | if (rta_max[i] > rtattr_max) | |
845 | rtattr_max = rta_max[i]; | |
846 | rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL); | |
847 | if (!rta_buf) | |
848 | panic("rtnetlink_init: cannot allocate rta_buf\n"); | |
849 | ||
06628607 PM |
850 | rtnl = netlink_kernel_create(NETLINK_ROUTE, RTNLGRP_MAX, rtnetlink_rcv, |
851 | THIS_MODULE); | |
1da177e4 LT |
852 | if (rtnl == NULL) |
853 | panic("rtnetlink_init: cannot initialize rtnetlink\n"); | |
854 | netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV); | |
855 | register_netdevice_notifier(&rtnetlink_dev_notifier); | |
856 | rtnetlink_links[PF_UNSPEC] = link_rtnetlink_table; | |
857 | rtnetlink_links[PF_PACKET] = link_rtnetlink_table; | |
858 | } | |
859 | ||
860 | EXPORT_SYMBOL(__rta_fill); | |
861 | EXPORT_SYMBOL(rtattr_strlcpy); | |
862 | EXPORT_SYMBOL(rtattr_parse); | |
863 | EXPORT_SYMBOL(rtnetlink_links); | |
864 | EXPORT_SYMBOL(rtnetlink_put_metrics); | |
1da177e4 | 865 | EXPORT_SYMBOL(rtnl_lock); |
6756ae4b | 866 | EXPORT_SYMBOL(rtnl_trylock); |
1da177e4 | 867 | EXPORT_SYMBOL(rtnl_unlock); |
2942e900 | 868 | EXPORT_SYMBOL(rtnl_unicast); |
97676b6b TG |
869 | EXPORT_SYMBOL(rtnl_notify); |
870 | EXPORT_SYMBOL(rtnl_set_sk_err); |