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 | ||
19 | #include <linux/config.h> | |
20 | #include <linux/errno.h> | |
21 | #include <linux/module.h> | |
22 | #include <linux/types.h> | |
23 | #include <linux/socket.h> | |
24 | #include <linux/kernel.h> | |
1da177e4 LT |
25 | #include <linux/sched.h> |
26 | #include <linux/timer.h> | |
27 | #include <linux/string.h> | |
28 | #include <linux/sockios.h> | |
29 | #include <linux/net.h> | |
30 | #include <linux/fcntl.h> | |
31 | #include <linux/mm.h> | |
32 | #include <linux/slab.h> | |
33 | #include <linux/interrupt.h> | |
34 | #include <linux/capability.h> | |
35 | #include <linux/skbuff.h> | |
36 | #include <linux/init.h> | |
37 | #include <linux/security.h> | |
38 | ||
39 | #include <asm/uaccess.h> | |
40 | #include <asm/system.h> | |
41 | #include <asm/string.h> | |
42 | ||
43 | #include <linux/inet.h> | |
44 | #include <linux/netdevice.h> | |
45 | #include <net/ip.h> | |
46 | #include <net/protocol.h> | |
47 | #include <net/arp.h> | |
48 | #include <net/route.h> | |
49 | #include <net/udp.h> | |
50 | #include <net/sock.h> | |
51 | #include <net/pkt_sched.h> | |
52 | ||
53 | DECLARE_MUTEX(rtnl_sem); | |
54 | ||
55 | void rtnl_lock(void) | |
56 | { | |
57 | rtnl_shlock(); | |
58 | } | |
59 | ||
60 | int rtnl_lock_interruptible(void) | |
61 | { | |
62 | return down_interruptible(&rtnl_sem); | |
63 | } | |
64 | ||
65 | void rtnl_unlock(void) | |
66 | { | |
67 | rtnl_shunlock(); | |
68 | ||
69 | netdev_run_todo(); | |
70 | } | |
71 | ||
72 | int rtattr_parse(struct rtattr *tb[], int maxattr, struct rtattr *rta, int len) | |
73 | { | |
74 | memset(tb, 0, sizeof(struct rtattr*)*maxattr); | |
75 | ||
76 | while (RTA_OK(rta, len)) { | |
77 | unsigned flavor = rta->rta_type; | |
78 | if (flavor && flavor <= maxattr) | |
79 | tb[flavor-1] = rta; | |
80 | rta = RTA_NEXT(rta, len); | |
81 | } | |
82 | return 0; | |
83 | } | |
84 | ||
85 | struct sock *rtnl; | |
86 | ||
87 | struct rtnetlink_link * rtnetlink_links[NPROTO]; | |
88 | ||
db46edc6 | 89 | static const int rtm_min[RTM_NR_FAMILIES] = |
1da177e4 | 90 | { |
f90a0a74 TG |
91 | [RTM_FAM(RTM_NEWLINK)] = NLMSG_LENGTH(sizeof(struct ifinfomsg)), |
92 | [RTM_FAM(RTM_NEWADDR)] = NLMSG_LENGTH(sizeof(struct ifaddrmsg)), | |
93 | [RTM_FAM(RTM_NEWROUTE)] = NLMSG_LENGTH(sizeof(struct rtmsg)), | |
94 | [RTM_FAM(RTM_NEWNEIGH)] = NLMSG_LENGTH(sizeof(struct ndmsg)), | |
95 | [RTM_FAM(RTM_NEWRULE)] = NLMSG_LENGTH(sizeof(struct rtmsg)), | |
96 | [RTM_FAM(RTM_NEWQDISC)] = NLMSG_LENGTH(sizeof(struct tcmsg)), | |
97 | [RTM_FAM(RTM_NEWTCLASS)] = NLMSG_LENGTH(sizeof(struct tcmsg)), | |
98 | [RTM_FAM(RTM_NEWTFILTER)] = NLMSG_LENGTH(sizeof(struct tcmsg)), | |
99 | [RTM_FAM(RTM_NEWACTION)] = NLMSG_LENGTH(sizeof(struct tcamsg)), | |
100 | [RTM_FAM(RTM_NEWPREFIX)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)), | |
101 | [RTM_FAM(RTM_GETMULTICAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)), | |
102 | [RTM_FAM(RTM_GETANYCAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)), | |
1da177e4 LT |
103 | }; |
104 | ||
db46edc6 | 105 | static const int rta_max[RTM_NR_FAMILIES] = |
1da177e4 | 106 | { |
f90a0a74 TG |
107 | [RTM_FAM(RTM_NEWLINK)] = IFLA_MAX, |
108 | [RTM_FAM(RTM_NEWADDR)] = IFA_MAX, | |
109 | [RTM_FAM(RTM_NEWROUTE)] = RTA_MAX, | |
110 | [RTM_FAM(RTM_NEWNEIGH)] = NDA_MAX, | |
111 | [RTM_FAM(RTM_NEWRULE)] = RTA_MAX, | |
112 | [RTM_FAM(RTM_NEWQDISC)] = TCA_MAX, | |
113 | [RTM_FAM(RTM_NEWTCLASS)] = TCA_MAX, | |
114 | [RTM_FAM(RTM_NEWTFILTER)] = TCA_MAX, | |
115 | [RTM_FAM(RTM_NEWACTION)] = TCAA_MAX, | |
1da177e4 LT |
116 | }; |
117 | ||
118 | void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const void *data) | |
119 | { | |
120 | struct rtattr *rta; | |
121 | int size = RTA_LENGTH(attrlen); | |
122 | ||
123 | rta = (struct rtattr*)skb_put(skb, RTA_ALIGN(size)); | |
124 | rta->rta_type = attrtype; | |
125 | rta->rta_len = size; | |
126 | memcpy(RTA_DATA(rta), data, attrlen); | |
127 | } | |
128 | ||
129 | size_t rtattr_strlcpy(char *dest, const struct rtattr *rta, size_t size) | |
130 | { | |
131 | size_t ret = RTA_PAYLOAD(rta); | |
132 | char *src = RTA_DATA(rta); | |
133 | ||
134 | if (ret > 0 && src[ret - 1] == '\0') | |
135 | ret--; | |
136 | if (size > 0) { | |
137 | size_t len = (ret >= size) ? size - 1 : ret; | |
138 | memset(dest, 0, size); | |
139 | memcpy(dest, src, len); | |
140 | } | |
141 | return ret; | |
142 | } | |
143 | ||
144 | int rtnetlink_send(struct sk_buff *skb, u32 pid, unsigned group, int echo) | |
145 | { | |
146 | int err = 0; | |
147 | ||
148 | NETLINK_CB(skb).dst_groups = group; | |
149 | if (echo) | |
150 | atomic_inc(&skb->users); | |
151 | netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL); | |
152 | if (echo) | |
153 | err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT); | |
154 | return err; | |
155 | } | |
156 | ||
157 | int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics) | |
158 | { | |
159 | struct rtattr *mx = (struct rtattr*)skb->tail; | |
160 | int i; | |
161 | ||
162 | RTA_PUT(skb, RTA_METRICS, 0, NULL); | |
163 | for (i=0; i<RTAX_MAX; i++) { | |
164 | if (metrics[i]) | |
165 | RTA_PUT(skb, i+1, sizeof(u32), metrics+i); | |
166 | } | |
167 | mx->rta_len = skb->tail - (u8*)mx; | |
168 | if (mx->rta_len == RTA_LENGTH(0)) | |
169 | skb_trim(skb, (u8*)mx - skb->data); | |
170 | return 0; | |
171 | ||
172 | rtattr_failure: | |
173 | skb_trim(skb, (u8*)mx - skb->data); | |
174 | return -1; | |
175 | } | |
176 | ||
177 | ||
178 | static int rtnetlink_fill_ifinfo(struct sk_buff *skb, struct net_device *dev, | |
179 | int type, u32 pid, u32 seq, u32 change) | |
180 | { | |
181 | struct ifinfomsg *r; | |
182 | struct nlmsghdr *nlh; | |
183 | unsigned char *b = skb->tail; | |
184 | ||
185 | nlh = NLMSG_PUT(skb, pid, seq, type, sizeof(*r)); | |
186 | if (pid) nlh->nlmsg_flags |= NLM_F_MULTI; | |
187 | r = NLMSG_DATA(nlh); | |
188 | r->ifi_family = AF_UNSPEC; | |
189 | r->ifi_type = dev->type; | |
190 | r->ifi_index = dev->ifindex; | |
191 | r->ifi_flags = dev_get_flags(dev); | |
192 | r->ifi_change = change; | |
193 | ||
194 | RTA_PUT(skb, IFLA_IFNAME, strlen(dev->name)+1, dev->name); | |
195 | ||
196 | if (1) { | |
197 | u32 txqlen = dev->tx_queue_len; | |
198 | RTA_PUT(skb, IFLA_TXQLEN, sizeof(txqlen), &txqlen); | |
199 | } | |
200 | ||
201 | if (1) { | |
202 | u32 weight = dev->weight; | |
203 | RTA_PUT(skb, IFLA_WEIGHT, sizeof(weight), &weight); | |
204 | } | |
205 | ||
206 | if (1) { | |
207 | struct rtnl_link_ifmap map = { | |
208 | .mem_start = dev->mem_start, | |
209 | .mem_end = dev->mem_end, | |
210 | .base_addr = dev->base_addr, | |
211 | .irq = dev->irq, | |
212 | .dma = dev->dma, | |
213 | .port = dev->if_port, | |
214 | }; | |
215 | RTA_PUT(skb, IFLA_MAP, sizeof(map), &map); | |
216 | } | |
217 | ||
218 | if (dev->addr_len) { | |
219 | RTA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr); | |
220 | RTA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast); | |
221 | } | |
222 | ||
223 | if (1) { | |
224 | u32 mtu = dev->mtu; | |
225 | RTA_PUT(skb, IFLA_MTU, sizeof(mtu), &mtu); | |
226 | } | |
227 | ||
228 | if (dev->ifindex != dev->iflink) { | |
229 | u32 iflink = dev->iflink; | |
230 | RTA_PUT(skb, IFLA_LINK, sizeof(iflink), &iflink); | |
231 | } | |
232 | ||
233 | if (dev->qdisc_sleeping) | |
234 | RTA_PUT(skb, IFLA_QDISC, | |
235 | strlen(dev->qdisc_sleeping->ops->id) + 1, | |
236 | dev->qdisc_sleeping->ops->id); | |
237 | ||
238 | if (dev->master) { | |
239 | u32 master = dev->master->ifindex; | |
240 | RTA_PUT(skb, IFLA_MASTER, sizeof(master), &master); | |
241 | } | |
242 | ||
243 | if (dev->get_stats) { | |
244 | unsigned long *stats = (unsigned long*)dev->get_stats(dev); | |
245 | if (stats) { | |
246 | struct rtattr *a; | |
247 | __u32 *s; | |
248 | int i; | |
249 | int n = sizeof(struct rtnl_link_stats)/4; | |
250 | ||
251 | a = __RTA_PUT(skb, IFLA_STATS, n*4); | |
252 | s = RTA_DATA(a); | |
253 | for (i=0; i<n; i++) | |
254 | s[i] = stats[i]; | |
255 | } | |
256 | } | |
257 | nlh->nlmsg_len = skb->tail - b; | |
258 | return skb->len; | |
259 | ||
260 | nlmsg_failure: | |
261 | rtattr_failure: | |
262 | skb_trim(skb, b - skb->data); | |
263 | return -1; | |
264 | } | |
265 | ||
266 | static int rtnetlink_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) | |
267 | { | |
268 | int idx; | |
269 | int s_idx = cb->args[0]; | |
270 | struct net_device *dev; | |
271 | ||
272 | read_lock(&dev_base_lock); | |
273 | for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) { | |
274 | if (idx < s_idx) | |
275 | continue; | |
276 | if (rtnetlink_fill_ifinfo(skb, dev, RTM_NEWLINK, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq, 0) <= 0) | |
277 | break; | |
278 | } | |
279 | read_unlock(&dev_base_lock); | |
280 | cb->args[0] = idx; | |
281 | ||
282 | return skb->len; | |
283 | } | |
284 | ||
285 | static int do_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) | |
286 | { | |
287 | struct ifinfomsg *ifm = NLMSG_DATA(nlh); | |
288 | struct rtattr **ida = arg; | |
289 | struct net_device *dev; | |
290 | int err, send_addr_notify = 0; | |
291 | ||
292 | if (ifm->ifi_index >= 0) | |
293 | dev = dev_get_by_index(ifm->ifi_index); | |
294 | else if (ida[IFLA_IFNAME - 1]) { | |
295 | char ifname[IFNAMSIZ]; | |
296 | ||
297 | if (rtattr_strlcpy(ifname, ida[IFLA_IFNAME - 1], | |
298 | IFNAMSIZ) >= IFNAMSIZ) | |
299 | return -EINVAL; | |
300 | dev = dev_get_by_name(ifname); | |
301 | } else | |
302 | return -EINVAL; | |
303 | ||
304 | if (!dev) | |
305 | return -ENODEV; | |
306 | ||
307 | err = -EINVAL; | |
308 | ||
309 | if (ifm->ifi_flags) | |
310 | dev_change_flags(dev, ifm->ifi_flags); | |
311 | ||
312 | if (ida[IFLA_MAP - 1]) { | |
313 | struct rtnl_link_ifmap *u_map; | |
314 | struct ifmap k_map; | |
315 | ||
316 | if (!dev->set_config) { | |
317 | err = -EOPNOTSUPP; | |
318 | goto out; | |
319 | } | |
320 | ||
321 | if (!netif_device_present(dev)) { | |
322 | err = -ENODEV; | |
323 | goto out; | |
324 | } | |
325 | ||
326 | if (ida[IFLA_MAP - 1]->rta_len != RTA_LENGTH(sizeof(*u_map))) | |
327 | goto out; | |
328 | ||
329 | u_map = RTA_DATA(ida[IFLA_MAP - 1]); | |
330 | ||
331 | k_map.mem_start = (unsigned long) u_map->mem_start; | |
332 | k_map.mem_end = (unsigned long) u_map->mem_end; | |
333 | k_map.base_addr = (unsigned short) u_map->base_addr; | |
334 | k_map.irq = (unsigned char) u_map->irq; | |
335 | k_map.dma = (unsigned char) u_map->dma; | |
336 | k_map.port = (unsigned char) u_map->port; | |
337 | ||
338 | err = dev->set_config(dev, &k_map); | |
339 | ||
340 | if (err) | |
341 | goto out; | |
342 | } | |
343 | ||
344 | if (ida[IFLA_ADDRESS - 1]) { | |
345 | if (!dev->set_mac_address) { | |
346 | err = -EOPNOTSUPP; | |
347 | goto out; | |
348 | } | |
349 | if (!netif_device_present(dev)) { | |
350 | err = -ENODEV; | |
351 | goto out; | |
352 | } | |
353 | if (ida[IFLA_ADDRESS - 1]->rta_len != RTA_LENGTH(dev->addr_len)) | |
354 | goto out; | |
355 | ||
356 | err = dev->set_mac_address(dev, RTA_DATA(ida[IFLA_ADDRESS - 1])); | |
357 | if (err) | |
358 | goto out; | |
359 | send_addr_notify = 1; | |
360 | } | |
361 | ||
362 | if (ida[IFLA_BROADCAST - 1]) { | |
363 | if (ida[IFLA_BROADCAST - 1]->rta_len != RTA_LENGTH(dev->addr_len)) | |
364 | goto out; | |
365 | memcpy(dev->broadcast, RTA_DATA(ida[IFLA_BROADCAST - 1]), | |
366 | dev->addr_len); | |
367 | send_addr_notify = 1; | |
368 | } | |
369 | ||
370 | if (ida[IFLA_MTU - 1]) { | |
371 | if (ida[IFLA_MTU - 1]->rta_len != RTA_LENGTH(sizeof(u32))) | |
372 | goto out; | |
373 | err = dev_set_mtu(dev, *((u32 *) RTA_DATA(ida[IFLA_MTU - 1]))); | |
374 | ||
375 | if (err) | |
376 | goto out; | |
377 | ||
378 | } | |
379 | ||
380 | if (ida[IFLA_TXQLEN - 1]) { | |
381 | if (ida[IFLA_TXQLEN - 1]->rta_len != RTA_LENGTH(sizeof(u32))) | |
382 | goto out; | |
383 | ||
384 | dev->tx_queue_len = *((u32 *) RTA_DATA(ida[IFLA_TXQLEN - 1])); | |
385 | } | |
386 | ||
387 | if (ida[IFLA_WEIGHT - 1]) { | |
388 | if (ida[IFLA_WEIGHT - 1]->rta_len != RTA_LENGTH(sizeof(u32))) | |
389 | goto out; | |
390 | ||
391 | dev->weight = *((u32 *) RTA_DATA(ida[IFLA_WEIGHT - 1])); | |
392 | } | |
393 | ||
394 | if (ifm->ifi_index >= 0 && ida[IFLA_IFNAME - 1]) { | |
395 | char ifname[IFNAMSIZ]; | |
396 | ||
397 | if (rtattr_strlcpy(ifname, ida[IFLA_IFNAME - 1], | |
398 | IFNAMSIZ) >= IFNAMSIZ) | |
399 | goto out; | |
400 | err = dev_change_name(dev, ifname); | |
401 | if (err) | |
402 | goto out; | |
403 | } | |
404 | ||
405 | err = 0; | |
406 | ||
407 | out: | |
408 | if (send_addr_notify) | |
409 | call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); | |
410 | ||
411 | dev_put(dev); | |
412 | return err; | |
413 | } | |
414 | ||
415 | static int rtnetlink_dump_all(struct sk_buff *skb, struct netlink_callback *cb) | |
416 | { | |
417 | int idx; | |
418 | int s_idx = cb->family; | |
419 | ||
420 | if (s_idx == 0) | |
421 | s_idx = 1; | |
422 | for (idx=1; idx<NPROTO; idx++) { | |
423 | int type = cb->nlh->nlmsg_type-RTM_BASE; | |
424 | if (idx < s_idx || idx == PF_PACKET) | |
425 | continue; | |
426 | if (rtnetlink_links[idx] == NULL || | |
427 | rtnetlink_links[idx][type].dumpit == NULL) | |
428 | continue; | |
429 | if (idx > s_idx) | |
430 | memset(&cb->args[0], 0, sizeof(cb->args)); | |
431 | if (rtnetlink_links[idx][type].dumpit(skb, cb)) | |
432 | break; | |
433 | } | |
434 | cb->family = idx; | |
435 | ||
436 | return skb->len; | |
437 | } | |
438 | ||
439 | void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change) | |
440 | { | |
441 | struct sk_buff *skb; | |
442 | int size = NLMSG_SPACE(sizeof(struct ifinfomsg) + | |
443 | sizeof(struct rtnl_link_ifmap) + | |
444 | sizeof(struct rtnl_link_stats) + 128); | |
445 | ||
446 | skb = alloc_skb(size, GFP_KERNEL); | |
447 | if (!skb) | |
448 | return; | |
449 | ||
450 | if (rtnetlink_fill_ifinfo(skb, dev, type, 0, 0, change) < 0) { | |
451 | kfree_skb(skb); | |
452 | return; | |
453 | } | |
454 | NETLINK_CB(skb).dst_groups = RTMGRP_LINK; | |
455 | netlink_broadcast(rtnl, skb, 0, RTMGRP_LINK, GFP_KERNEL); | |
456 | } | |
457 | ||
458 | static int rtnetlink_done(struct netlink_callback *cb) | |
459 | { | |
460 | return 0; | |
461 | } | |
462 | ||
463 | /* Protected by RTNL sempahore. */ | |
464 | static struct rtattr **rta_buf; | |
465 | static int rtattr_max; | |
466 | ||
467 | /* Process one rtnetlink message. */ | |
468 | ||
469 | static __inline__ int | |
470 | rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, int *errp) | |
471 | { | |
472 | struct rtnetlink_link *link; | |
473 | struct rtnetlink_link *link_tab; | |
474 | int sz_idx, kind; | |
475 | int min_len; | |
476 | int family; | |
477 | int type; | |
478 | int err; | |
479 | ||
480 | /* Only requests are handled by kernel now */ | |
481 | if (!(nlh->nlmsg_flags&NLM_F_REQUEST)) | |
482 | return 0; | |
483 | ||
484 | type = nlh->nlmsg_type; | |
485 | ||
486 | /* A control message: ignore them */ | |
487 | if (type < RTM_BASE) | |
488 | return 0; | |
489 | ||
490 | /* Unknown message: reply with EINVAL */ | |
491 | if (type > RTM_MAX) | |
492 | goto err_inval; | |
493 | ||
494 | type -= RTM_BASE; | |
495 | ||
496 | /* All the messages must have at least 1 byte length */ | |
497 | if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg))) | |
498 | return 0; | |
499 | ||
500 | family = ((struct rtgenmsg*)NLMSG_DATA(nlh))->rtgen_family; | |
501 | if (family >= NPROTO) { | |
502 | *errp = -EAFNOSUPPORT; | |
503 | return -1; | |
504 | } | |
505 | ||
506 | link_tab = rtnetlink_links[family]; | |
507 | if (link_tab == NULL) | |
508 | link_tab = rtnetlink_links[PF_UNSPEC]; | |
509 | link = &link_tab[type]; | |
510 | ||
511 | sz_idx = type>>2; | |
512 | kind = type&3; | |
513 | ||
514 | if (kind != 2 && security_netlink_recv(skb)) { | |
515 | *errp = -EPERM; | |
516 | return -1; | |
517 | } | |
518 | ||
519 | if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) { | |
520 | u32 rlen; | |
521 | ||
522 | if (link->dumpit == NULL) | |
523 | link = &(rtnetlink_links[PF_UNSPEC][type]); | |
524 | ||
525 | if (link->dumpit == NULL) | |
526 | goto err_inval; | |
527 | ||
528 | if ((*errp = netlink_dump_start(rtnl, skb, nlh, | |
529 | link->dumpit, | |
530 | rtnetlink_done)) != 0) { | |
531 | return -1; | |
532 | } | |
533 | rlen = NLMSG_ALIGN(nlh->nlmsg_len); | |
534 | if (rlen > skb->len) | |
535 | rlen = skb->len; | |
536 | skb_pull(skb, rlen); | |
537 | return -1; | |
538 | } | |
539 | ||
540 | memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *))); | |
541 | ||
542 | min_len = rtm_min[sz_idx]; | |
543 | if (nlh->nlmsg_len < min_len) | |
544 | goto err_inval; | |
545 | ||
546 | if (nlh->nlmsg_len > min_len) { | |
547 | int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len); | |
548 | struct rtattr *attr = (void*)nlh + NLMSG_ALIGN(min_len); | |
549 | ||
550 | while (RTA_OK(attr, attrlen)) { | |
551 | unsigned flavor = attr->rta_type; | |
552 | if (flavor) { | |
553 | if (flavor > rta_max[sz_idx]) | |
554 | goto err_inval; | |
555 | rta_buf[flavor-1] = attr; | |
556 | } | |
557 | attr = RTA_NEXT(attr, attrlen); | |
558 | } | |
559 | } | |
560 | ||
561 | if (link->doit == NULL) | |
562 | link = &(rtnetlink_links[PF_UNSPEC][type]); | |
563 | if (link->doit == NULL) | |
564 | goto err_inval; | |
565 | err = link->doit(skb, nlh, (void *)&rta_buf[0]); | |
566 | ||
567 | *errp = err; | |
568 | return err; | |
569 | ||
570 | err_inval: | |
571 | *errp = -EINVAL; | |
572 | return -1; | |
573 | } | |
574 | ||
575 | /* | |
576 | * Process one packet of messages. | |
577 | * Malformed skbs with wrong lengths of messages are discarded silently. | |
578 | */ | |
579 | ||
580 | static inline int rtnetlink_rcv_skb(struct sk_buff *skb) | |
581 | { | |
582 | int err; | |
583 | struct nlmsghdr * nlh; | |
584 | ||
585 | while (skb->len >= NLMSG_SPACE(0)) { | |
586 | u32 rlen; | |
587 | ||
588 | nlh = (struct nlmsghdr *)skb->data; | |
589 | if (nlh->nlmsg_len < sizeof(*nlh) || skb->len < nlh->nlmsg_len) | |
590 | return 0; | |
591 | rlen = NLMSG_ALIGN(nlh->nlmsg_len); | |
592 | if (rlen > skb->len) | |
593 | rlen = skb->len; | |
594 | if (rtnetlink_rcv_msg(skb, nlh, &err)) { | |
595 | /* Not error, but we must interrupt processing here: | |
596 | * Note, that in this case we do not pull message | |
597 | * from skb, it will be processed later. | |
598 | */ | |
599 | if (err == 0) | |
600 | return -1; | |
601 | netlink_ack(skb, nlh, err); | |
602 | } else if (nlh->nlmsg_flags&NLM_F_ACK) | |
603 | netlink_ack(skb, nlh, 0); | |
604 | skb_pull(skb, rlen); | |
605 | } | |
606 | ||
607 | return 0; | |
608 | } | |
609 | ||
610 | /* | |
611 | * rtnetlink input queue processing routine: | |
2a0a6ebe | 612 | * - process as much as there was in the queue upon entry. |
1da177e4 | 613 | * - feed skbs to rtnetlink_rcv_skb, until it refuse a message, |
2a0a6ebe | 614 | * that will occur, when a dump started. |
1da177e4 LT |
615 | */ |
616 | ||
617 | static void rtnetlink_rcv(struct sock *sk, int len) | |
618 | { | |
2a0a6ebe HX |
619 | unsigned int qlen = skb_queue_len(&sk->sk_receive_queue); |
620 | ||
1da177e4 LT |
621 | do { |
622 | struct sk_buff *skb; | |
623 | ||
2a0a6ebe HX |
624 | rtnl_lock(); |
625 | ||
626 | if (qlen > skb_queue_len(&sk->sk_receive_queue)) | |
627 | qlen = skb_queue_len(&sk->sk_receive_queue); | |
1da177e4 | 628 | |
09e14305 | 629 | for (; qlen; qlen--) { |
2a0a6ebe | 630 | skb = skb_dequeue(&sk->sk_receive_queue); |
1da177e4 | 631 | if (rtnetlink_rcv_skb(skb)) { |
09e14305 | 632 | if (skb->len) |
1da177e4 LT |
633 | skb_queue_head(&sk->sk_receive_queue, |
634 | skb); | |
0f4821e7 | 635 | else { |
1da177e4 | 636 | kfree_skb(skb); |
0f4821e7 DM |
637 | qlen--; |
638 | } | |
1da177e4 LT |
639 | break; |
640 | } | |
641 | kfree_skb(skb); | |
642 | } | |
643 | ||
644 | up(&rtnl_sem); | |
645 | ||
646 | netdev_run_todo(); | |
2a0a6ebe | 647 | } while (qlen); |
1da177e4 LT |
648 | } |
649 | ||
db46edc6 | 650 | static struct rtnetlink_link link_rtnetlink_table[RTM_NR_MSGTYPES] = |
1da177e4 LT |
651 | { |
652 | [RTM_GETLINK - RTM_BASE] = { .dumpit = rtnetlink_dump_ifinfo }, | |
653 | [RTM_SETLINK - RTM_BASE] = { .doit = do_setlink }, | |
654 | [RTM_GETADDR - RTM_BASE] = { .dumpit = rtnetlink_dump_all }, | |
655 | [RTM_GETROUTE - RTM_BASE] = { .dumpit = rtnetlink_dump_all }, | |
656 | [RTM_NEWNEIGH - RTM_BASE] = { .doit = neigh_add }, | |
657 | [RTM_DELNEIGH - RTM_BASE] = { .doit = neigh_delete }, | |
240eed95 | 658 | [RTM_GETNEIGH - RTM_BASE] = { .dumpit = neigh_dump_info }, |
98f245e7 | 659 | [RTM_GETRULE - RTM_BASE] = { .dumpit = rtnetlink_dump_all }, |
1da177e4 LT |
660 | }; |
661 | ||
662 | static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr) | |
663 | { | |
664 | struct net_device *dev = ptr; | |
665 | switch (event) { | |
666 | case NETDEV_UNREGISTER: | |
667 | rtmsg_ifinfo(RTM_DELLINK, dev, ~0U); | |
668 | break; | |
669 | case NETDEV_REGISTER: | |
670 | rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U); | |
671 | break; | |
672 | case NETDEV_UP: | |
673 | case NETDEV_DOWN: | |
674 | rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING); | |
675 | break; | |
676 | case NETDEV_CHANGE: | |
677 | case NETDEV_GOING_DOWN: | |
678 | break; | |
679 | default: | |
680 | rtmsg_ifinfo(RTM_NEWLINK, dev, 0); | |
681 | break; | |
682 | } | |
683 | return NOTIFY_DONE; | |
684 | } | |
685 | ||
686 | static struct notifier_block rtnetlink_dev_notifier = { | |
687 | .notifier_call = rtnetlink_event, | |
688 | }; | |
689 | ||
690 | void __init rtnetlink_init(void) | |
691 | { | |
692 | int i; | |
693 | ||
694 | rtattr_max = 0; | |
695 | for (i = 0; i < ARRAY_SIZE(rta_max); i++) | |
696 | if (rta_max[i] > rtattr_max) | |
697 | rtattr_max = rta_max[i]; | |
698 | rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL); | |
699 | if (!rta_buf) | |
700 | panic("rtnetlink_init: cannot allocate rta_buf\n"); | |
701 | ||
702 | rtnl = netlink_kernel_create(NETLINK_ROUTE, rtnetlink_rcv); | |
703 | if (rtnl == NULL) | |
704 | panic("rtnetlink_init: cannot initialize rtnetlink\n"); | |
705 | netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV); | |
706 | register_netdevice_notifier(&rtnetlink_dev_notifier); | |
707 | rtnetlink_links[PF_UNSPEC] = link_rtnetlink_table; | |
708 | rtnetlink_links[PF_PACKET] = link_rtnetlink_table; | |
709 | } | |
710 | ||
711 | EXPORT_SYMBOL(__rta_fill); | |
712 | EXPORT_SYMBOL(rtattr_strlcpy); | |
713 | EXPORT_SYMBOL(rtattr_parse); | |
714 | EXPORT_SYMBOL(rtnetlink_links); | |
715 | EXPORT_SYMBOL(rtnetlink_put_metrics); | |
716 | EXPORT_SYMBOL(rtnl); | |
717 | EXPORT_SYMBOL(rtnl_lock); | |
718 | EXPORT_SYMBOL(rtnl_lock_interruptible); | |
719 | EXPORT_SYMBOL(rtnl_sem); | |
720 | EXPORT_SYMBOL(rtnl_unlock); |