Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * INET An implementation of the TCP/IP protocol suite for the LINUX | |
3 | * operating system. INET is implemented using the BSD Socket | |
4 | * interface as the means of communication with the user level. | |
5 | * | |
6 | * Routing netlink socket interface: protocol independent part. | |
7 | * | |
8 | * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or | |
11 | * modify it under the terms of the GNU General Public License | |
12 | * as published by the Free Software Foundation; either version | |
13 | * 2 of the License, or (at your option) any later version. | |
14 | * | |
15 | * Fixes: | |
16 | * Vitaly E. Lavrov RTA_OK arithmetics was wrong. | |
17 | */ | |
18 | ||
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)), | |
c7fb64db | 103 | [RTM_FAM(RTM_NEWNEIGHTBL)] = NLMSG_LENGTH(sizeof(struct ndtmsg)), |
1da177e4 LT |
104 | }; |
105 | ||
db46edc6 | 106 | static const int rta_max[RTM_NR_FAMILIES] = |
1da177e4 | 107 | { |
f90a0a74 TG |
108 | [RTM_FAM(RTM_NEWLINK)] = IFLA_MAX, |
109 | [RTM_FAM(RTM_NEWADDR)] = IFA_MAX, | |
110 | [RTM_FAM(RTM_NEWROUTE)] = RTA_MAX, | |
111 | [RTM_FAM(RTM_NEWNEIGH)] = NDA_MAX, | |
112 | [RTM_FAM(RTM_NEWRULE)] = RTA_MAX, | |
113 | [RTM_FAM(RTM_NEWQDISC)] = TCA_MAX, | |
114 | [RTM_FAM(RTM_NEWTCLASS)] = TCA_MAX, | |
115 | [RTM_FAM(RTM_NEWTFILTER)] = TCA_MAX, | |
116 | [RTM_FAM(RTM_NEWACTION)] = TCAA_MAX, | |
c7fb64db | 117 | [RTM_FAM(RTM_NEWNEIGHTBL)] = NDTA_MAX, |
1da177e4 LT |
118 | }; |
119 | ||
120 | void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const void *data) | |
121 | { | |
122 | struct rtattr *rta; | |
123 | int size = RTA_LENGTH(attrlen); | |
124 | ||
125 | rta = (struct rtattr*)skb_put(skb, RTA_ALIGN(size)); | |
126 | rta->rta_type = attrtype; | |
127 | rta->rta_len = size; | |
128 | memcpy(RTA_DATA(rta), data, attrlen); | |
b3563c4f | 129 | memset(RTA_DATA(rta) + attrlen, 0, RTA_ALIGN(size) - size); |
1da177e4 LT |
130 | } |
131 | ||
132 | size_t rtattr_strlcpy(char *dest, const struct rtattr *rta, size_t size) | |
133 | { | |
134 | size_t ret = RTA_PAYLOAD(rta); | |
135 | char *src = RTA_DATA(rta); | |
136 | ||
137 | if (ret > 0 && src[ret - 1] == '\0') | |
138 | ret--; | |
139 | if (size > 0) { | |
140 | size_t len = (ret >= size) ? size - 1 : ret; | |
141 | memset(dest, 0, size); | |
142 | memcpy(dest, src, len); | |
143 | } | |
144 | return ret; | |
145 | } | |
146 | ||
147 | int rtnetlink_send(struct sk_buff *skb, u32 pid, unsigned group, int echo) | |
148 | { | |
149 | int err = 0; | |
150 | ||
ac6d439d | 151 | NETLINK_CB(skb).dst_group = group; |
1da177e4 LT |
152 | if (echo) |
153 | atomic_inc(&skb->users); | |
154 | netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL); | |
155 | if (echo) | |
156 | err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT); | |
157 | return err; | |
158 | } | |
159 | ||
160 | int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics) | |
161 | { | |
162 | struct rtattr *mx = (struct rtattr*)skb->tail; | |
163 | int i; | |
164 | ||
165 | RTA_PUT(skb, RTA_METRICS, 0, NULL); | |
166 | for (i=0; i<RTAX_MAX; i++) { | |
167 | if (metrics[i]) | |
168 | RTA_PUT(skb, i+1, sizeof(u32), metrics+i); | |
169 | } | |
170 | mx->rta_len = skb->tail - (u8*)mx; | |
171 | if (mx->rta_len == RTA_LENGTH(0)) | |
172 | skb_trim(skb, (u8*)mx - skb->data); | |
173 | return 0; | |
174 | ||
175 | rtattr_failure: | |
176 | skb_trim(skb, (u8*)mx - skb->data); | |
177 | return -1; | |
178 | } | |
179 | ||
180 | ||
181 | static int rtnetlink_fill_ifinfo(struct sk_buff *skb, struct net_device *dev, | |
b6544c0b JHS |
182 | int type, u32 pid, u32 seq, u32 change, |
183 | unsigned int flags) | |
1da177e4 LT |
184 | { |
185 | struct ifinfomsg *r; | |
186 | struct nlmsghdr *nlh; | |
187 | unsigned char *b = skb->tail; | |
188 | ||
b6544c0b | 189 | nlh = NLMSG_NEW(skb, pid, seq, type, sizeof(*r), flags); |
1da177e4 LT |
190 | r = NLMSG_DATA(nlh); |
191 | r->ifi_family = AF_UNSPEC; | |
9ef1d4c7 | 192 | r->__ifi_pad = 0; |
1da177e4 LT |
193 | r->ifi_type = dev->type; |
194 | r->ifi_index = dev->ifindex; | |
195 | r->ifi_flags = dev_get_flags(dev); | |
196 | r->ifi_change = change; | |
197 | ||
198 | RTA_PUT(skb, IFLA_IFNAME, strlen(dev->name)+1, dev->name); | |
199 | ||
200 | if (1) { | |
201 | u32 txqlen = dev->tx_queue_len; | |
202 | RTA_PUT(skb, IFLA_TXQLEN, sizeof(txqlen), &txqlen); | |
203 | } | |
204 | ||
205 | if (1) { | |
206 | u32 weight = dev->weight; | |
207 | RTA_PUT(skb, IFLA_WEIGHT, sizeof(weight), &weight); | |
208 | } | |
209 | ||
210 | if (1) { | |
211 | struct rtnl_link_ifmap map = { | |
212 | .mem_start = dev->mem_start, | |
213 | .mem_end = dev->mem_end, | |
214 | .base_addr = dev->base_addr, | |
215 | .irq = dev->irq, | |
216 | .dma = dev->dma, | |
217 | .port = dev->if_port, | |
218 | }; | |
219 | RTA_PUT(skb, IFLA_MAP, sizeof(map), &map); | |
220 | } | |
221 | ||
222 | if (dev->addr_len) { | |
223 | RTA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr); | |
224 | RTA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast); | |
225 | } | |
226 | ||
227 | if (1) { | |
228 | u32 mtu = dev->mtu; | |
229 | RTA_PUT(skb, IFLA_MTU, sizeof(mtu), &mtu); | |
230 | } | |
231 | ||
232 | if (dev->ifindex != dev->iflink) { | |
233 | u32 iflink = dev->iflink; | |
234 | RTA_PUT(skb, IFLA_LINK, sizeof(iflink), &iflink); | |
235 | } | |
236 | ||
237 | if (dev->qdisc_sleeping) | |
238 | RTA_PUT(skb, IFLA_QDISC, | |
239 | strlen(dev->qdisc_sleeping->ops->id) + 1, | |
240 | dev->qdisc_sleeping->ops->id); | |
241 | ||
242 | if (dev->master) { | |
243 | u32 master = dev->master->ifindex; | |
244 | RTA_PUT(skb, IFLA_MASTER, sizeof(master), &master); | |
245 | } | |
246 | ||
247 | if (dev->get_stats) { | |
248 | unsigned long *stats = (unsigned long*)dev->get_stats(dev); | |
249 | if (stats) { | |
250 | struct rtattr *a; | |
251 | __u32 *s; | |
252 | int i; | |
253 | int n = sizeof(struct rtnl_link_stats)/4; | |
254 | ||
255 | a = __RTA_PUT(skb, IFLA_STATS, n*4); | |
256 | s = RTA_DATA(a); | |
257 | for (i=0; i<n; i++) | |
258 | s[i] = stats[i]; | |
259 | } | |
260 | } | |
261 | nlh->nlmsg_len = skb->tail - b; | |
262 | return skb->len; | |
263 | ||
264 | nlmsg_failure: | |
265 | rtattr_failure: | |
266 | skb_trim(skb, b - skb->data); | |
267 | return -1; | |
268 | } | |
269 | ||
270 | static int rtnetlink_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) | |
271 | { | |
272 | int idx; | |
273 | int s_idx = cb->args[0]; | |
274 | struct net_device *dev; | |
275 | ||
276 | read_lock(&dev_base_lock); | |
277 | for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) { | |
278 | if (idx < s_idx) | |
279 | continue; | |
b6544c0b JHS |
280 | if (rtnetlink_fill_ifinfo(skb, dev, RTM_NEWLINK, |
281 | NETLINK_CB(cb->skb).pid, | |
282 | cb->nlh->nlmsg_seq, 0, | |
283 | NLM_F_MULTI) <= 0) | |
1da177e4 LT |
284 | break; |
285 | } | |
286 | read_unlock(&dev_base_lock); | |
287 | cb->args[0] = idx; | |
288 | ||
289 | return skb->len; | |
290 | } | |
291 | ||
292 | static int do_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) | |
293 | { | |
294 | struct ifinfomsg *ifm = NLMSG_DATA(nlh); | |
295 | struct rtattr **ida = arg; | |
296 | struct net_device *dev; | |
297 | int err, send_addr_notify = 0; | |
298 | ||
299 | if (ifm->ifi_index >= 0) | |
300 | dev = dev_get_by_index(ifm->ifi_index); | |
301 | else if (ida[IFLA_IFNAME - 1]) { | |
302 | char ifname[IFNAMSIZ]; | |
303 | ||
304 | if (rtattr_strlcpy(ifname, ida[IFLA_IFNAME - 1], | |
305 | IFNAMSIZ) >= IFNAMSIZ) | |
306 | return -EINVAL; | |
307 | dev = dev_get_by_name(ifname); | |
308 | } else | |
309 | return -EINVAL; | |
310 | ||
311 | if (!dev) | |
312 | return -ENODEV; | |
313 | ||
314 | err = -EINVAL; | |
315 | ||
316 | if (ifm->ifi_flags) | |
317 | dev_change_flags(dev, ifm->ifi_flags); | |
318 | ||
319 | if (ida[IFLA_MAP - 1]) { | |
320 | struct rtnl_link_ifmap *u_map; | |
321 | struct ifmap k_map; | |
322 | ||
323 | if (!dev->set_config) { | |
324 | err = -EOPNOTSUPP; | |
325 | goto out; | |
326 | } | |
327 | ||
328 | if (!netif_device_present(dev)) { | |
329 | err = -ENODEV; | |
330 | goto out; | |
331 | } | |
332 | ||
333 | if (ida[IFLA_MAP - 1]->rta_len != RTA_LENGTH(sizeof(*u_map))) | |
334 | goto out; | |
335 | ||
336 | u_map = RTA_DATA(ida[IFLA_MAP - 1]); | |
337 | ||
338 | k_map.mem_start = (unsigned long) u_map->mem_start; | |
339 | k_map.mem_end = (unsigned long) u_map->mem_end; | |
340 | k_map.base_addr = (unsigned short) u_map->base_addr; | |
341 | k_map.irq = (unsigned char) u_map->irq; | |
342 | k_map.dma = (unsigned char) u_map->dma; | |
343 | k_map.port = (unsigned char) u_map->port; | |
344 | ||
345 | err = dev->set_config(dev, &k_map); | |
346 | ||
347 | if (err) | |
348 | goto out; | |
349 | } | |
350 | ||
351 | if (ida[IFLA_ADDRESS - 1]) { | |
352 | if (!dev->set_mac_address) { | |
353 | err = -EOPNOTSUPP; | |
354 | goto out; | |
355 | } | |
356 | if (!netif_device_present(dev)) { | |
357 | err = -ENODEV; | |
358 | goto out; | |
359 | } | |
360 | if (ida[IFLA_ADDRESS - 1]->rta_len != RTA_LENGTH(dev->addr_len)) | |
361 | goto out; | |
362 | ||
363 | err = dev->set_mac_address(dev, RTA_DATA(ida[IFLA_ADDRESS - 1])); | |
364 | if (err) | |
365 | goto out; | |
366 | send_addr_notify = 1; | |
367 | } | |
368 | ||
369 | if (ida[IFLA_BROADCAST - 1]) { | |
370 | if (ida[IFLA_BROADCAST - 1]->rta_len != RTA_LENGTH(dev->addr_len)) | |
371 | goto out; | |
372 | memcpy(dev->broadcast, RTA_DATA(ida[IFLA_BROADCAST - 1]), | |
373 | dev->addr_len); | |
374 | send_addr_notify = 1; | |
375 | } | |
376 | ||
377 | if (ida[IFLA_MTU - 1]) { | |
378 | if (ida[IFLA_MTU - 1]->rta_len != RTA_LENGTH(sizeof(u32))) | |
379 | goto out; | |
380 | err = dev_set_mtu(dev, *((u32 *) RTA_DATA(ida[IFLA_MTU - 1]))); | |
381 | ||
382 | if (err) | |
383 | goto out; | |
384 | ||
385 | } | |
386 | ||
387 | if (ida[IFLA_TXQLEN - 1]) { | |
388 | if (ida[IFLA_TXQLEN - 1]->rta_len != RTA_LENGTH(sizeof(u32))) | |
389 | goto out; | |
390 | ||
391 | dev->tx_queue_len = *((u32 *) RTA_DATA(ida[IFLA_TXQLEN - 1])); | |
392 | } | |
393 | ||
394 | if (ida[IFLA_WEIGHT - 1]) { | |
395 | if (ida[IFLA_WEIGHT - 1]->rta_len != RTA_LENGTH(sizeof(u32))) | |
396 | goto out; | |
397 | ||
398 | dev->weight = *((u32 *) RTA_DATA(ida[IFLA_WEIGHT - 1])); | |
399 | } | |
400 | ||
401 | if (ifm->ifi_index >= 0 && ida[IFLA_IFNAME - 1]) { | |
402 | char ifname[IFNAMSIZ]; | |
403 | ||
404 | if (rtattr_strlcpy(ifname, ida[IFLA_IFNAME - 1], | |
405 | IFNAMSIZ) >= IFNAMSIZ) | |
406 | goto out; | |
407 | err = dev_change_name(dev, ifname); | |
408 | if (err) | |
409 | goto out; | |
410 | } | |
411 | ||
412 | err = 0; | |
413 | ||
414 | out: | |
415 | if (send_addr_notify) | |
416 | call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); | |
417 | ||
418 | dev_put(dev); | |
419 | return err; | |
420 | } | |
421 | ||
422 | static int rtnetlink_dump_all(struct sk_buff *skb, struct netlink_callback *cb) | |
423 | { | |
424 | int idx; | |
425 | int s_idx = cb->family; | |
426 | ||
427 | if (s_idx == 0) | |
428 | s_idx = 1; | |
429 | for (idx=1; idx<NPROTO; idx++) { | |
430 | int type = cb->nlh->nlmsg_type-RTM_BASE; | |
431 | if (idx < s_idx || idx == PF_PACKET) | |
432 | continue; | |
433 | if (rtnetlink_links[idx] == NULL || | |
434 | rtnetlink_links[idx][type].dumpit == NULL) | |
435 | continue; | |
436 | if (idx > s_idx) | |
437 | memset(&cb->args[0], 0, sizeof(cb->args)); | |
438 | if (rtnetlink_links[idx][type].dumpit(skb, cb)) | |
439 | break; | |
440 | } | |
441 | cb->family = idx; | |
442 | ||
443 | return skb->len; | |
444 | } | |
445 | ||
446 | void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change) | |
447 | { | |
448 | struct sk_buff *skb; | |
449 | int size = NLMSG_SPACE(sizeof(struct ifinfomsg) + | |
450 | sizeof(struct rtnl_link_ifmap) + | |
451 | sizeof(struct rtnl_link_stats) + 128); | |
452 | ||
453 | skb = alloc_skb(size, GFP_KERNEL); | |
454 | if (!skb) | |
455 | return; | |
456 | ||
9ed19f33 | 457 | if (rtnetlink_fill_ifinfo(skb, dev, type, current->pid, 0, change, 0) < 0) { |
1da177e4 LT |
458 | kfree_skb(skb); |
459 | return; | |
460 | } | |
ac6d439d PM |
461 | NETLINK_CB(skb).dst_group = RTNLGRP_LINK; |
462 | netlink_broadcast(rtnl, skb, 0, RTNLGRP_LINK, GFP_KERNEL); | |
1da177e4 LT |
463 | } |
464 | ||
465 | static int rtnetlink_done(struct netlink_callback *cb) | |
466 | { | |
467 | return 0; | |
468 | } | |
469 | ||
470 | /* Protected by RTNL sempahore. */ | |
471 | static struct rtattr **rta_buf; | |
472 | static int rtattr_max; | |
473 | ||
474 | /* Process one rtnetlink message. */ | |
475 | ||
476 | static __inline__ int | |
477 | rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, int *errp) | |
478 | { | |
479 | struct rtnetlink_link *link; | |
480 | struct rtnetlink_link *link_tab; | |
481 | int sz_idx, kind; | |
482 | int min_len; | |
483 | int family; | |
484 | int type; | |
485 | int err; | |
486 | ||
487 | /* Only requests are handled by kernel now */ | |
488 | if (!(nlh->nlmsg_flags&NLM_F_REQUEST)) | |
489 | return 0; | |
490 | ||
491 | type = nlh->nlmsg_type; | |
492 | ||
493 | /* A control message: ignore them */ | |
494 | if (type < RTM_BASE) | |
495 | return 0; | |
496 | ||
497 | /* Unknown message: reply with EINVAL */ | |
498 | if (type > RTM_MAX) | |
499 | goto err_inval; | |
500 | ||
501 | type -= RTM_BASE; | |
502 | ||
503 | /* All the messages must have at least 1 byte length */ | |
504 | if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg))) | |
505 | return 0; | |
506 | ||
507 | family = ((struct rtgenmsg*)NLMSG_DATA(nlh))->rtgen_family; | |
508 | if (family >= NPROTO) { | |
509 | *errp = -EAFNOSUPPORT; | |
510 | return -1; | |
511 | } | |
512 | ||
513 | link_tab = rtnetlink_links[family]; | |
514 | if (link_tab == NULL) | |
515 | link_tab = rtnetlink_links[PF_UNSPEC]; | |
516 | link = &link_tab[type]; | |
517 | ||
518 | sz_idx = type>>2; | |
519 | kind = type&3; | |
520 | ||
521 | if (kind != 2 && security_netlink_recv(skb)) { | |
522 | *errp = -EPERM; | |
523 | return -1; | |
524 | } | |
525 | ||
526 | if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) { | |
527 | u32 rlen; | |
528 | ||
529 | if (link->dumpit == NULL) | |
530 | link = &(rtnetlink_links[PF_UNSPEC][type]); | |
531 | ||
532 | if (link->dumpit == NULL) | |
533 | goto err_inval; | |
534 | ||
535 | if ((*errp = netlink_dump_start(rtnl, skb, nlh, | |
536 | link->dumpit, | |
537 | rtnetlink_done)) != 0) { | |
538 | return -1; | |
539 | } | |
540 | rlen = NLMSG_ALIGN(nlh->nlmsg_len); | |
541 | if (rlen > skb->len) | |
542 | rlen = skb->len; | |
543 | skb_pull(skb, rlen); | |
544 | return -1; | |
545 | } | |
546 | ||
547 | memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *))); | |
548 | ||
549 | min_len = rtm_min[sz_idx]; | |
550 | if (nlh->nlmsg_len < min_len) | |
551 | goto err_inval; | |
552 | ||
553 | if (nlh->nlmsg_len > min_len) { | |
554 | int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len); | |
555 | struct rtattr *attr = (void*)nlh + NLMSG_ALIGN(min_len); | |
556 | ||
557 | while (RTA_OK(attr, attrlen)) { | |
558 | unsigned flavor = attr->rta_type; | |
559 | if (flavor) { | |
560 | if (flavor > rta_max[sz_idx]) | |
561 | goto err_inval; | |
562 | rta_buf[flavor-1] = attr; | |
563 | } | |
564 | attr = RTA_NEXT(attr, attrlen); | |
565 | } | |
566 | } | |
567 | ||
568 | if (link->doit == NULL) | |
569 | link = &(rtnetlink_links[PF_UNSPEC][type]); | |
570 | if (link->doit == NULL) | |
571 | goto err_inval; | |
572 | err = link->doit(skb, nlh, (void *)&rta_buf[0]); | |
573 | ||
574 | *errp = err; | |
575 | return err; | |
576 | ||
577 | err_inval: | |
578 | *errp = -EINVAL; | |
579 | return -1; | |
580 | } | |
581 | ||
582 | /* | |
583 | * Process one packet of messages. | |
584 | * Malformed skbs with wrong lengths of messages are discarded silently. | |
585 | */ | |
586 | ||
587 | static inline int rtnetlink_rcv_skb(struct sk_buff *skb) | |
588 | { | |
589 | int err; | |
590 | struct nlmsghdr * nlh; | |
591 | ||
592 | while (skb->len >= NLMSG_SPACE(0)) { | |
593 | u32 rlen; | |
594 | ||
595 | nlh = (struct nlmsghdr *)skb->data; | |
596 | if (nlh->nlmsg_len < sizeof(*nlh) || skb->len < nlh->nlmsg_len) | |
597 | return 0; | |
598 | rlen = NLMSG_ALIGN(nlh->nlmsg_len); | |
599 | if (rlen > skb->len) | |
600 | rlen = skb->len; | |
601 | if (rtnetlink_rcv_msg(skb, nlh, &err)) { | |
602 | /* Not error, but we must interrupt processing here: | |
603 | * Note, that in this case we do not pull message | |
604 | * from skb, it will be processed later. | |
605 | */ | |
606 | if (err == 0) | |
607 | return -1; | |
608 | netlink_ack(skb, nlh, err); | |
609 | } else if (nlh->nlmsg_flags&NLM_F_ACK) | |
610 | netlink_ack(skb, nlh, 0); | |
611 | skb_pull(skb, rlen); | |
612 | } | |
613 | ||
614 | return 0; | |
615 | } | |
616 | ||
617 | /* | |
618 | * rtnetlink input queue processing routine: | |
2a0a6ebe | 619 | * - process as much as there was in the queue upon entry. |
1da177e4 | 620 | * - feed skbs to rtnetlink_rcv_skb, until it refuse a message, |
2a0a6ebe | 621 | * that will occur, when a dump started. |
1da177e4 LT |
622 | */ |
623 | ||
624 | static void rtnetlink_rcv(struct sock *sk, int len) | |
625 | { | |
2a0a6ebe HX |
626 | unsigned int qlen = skb_queue_len(&sk->sk_receive_queue); |
627 | ||
1da177e4 LT |
628 | do { |
629 | struct sk_buff *skb; | |
630 | ||
2a0a6ebe HX |
631 | rtnl_lock(); |
632 | ||
633 | if (qlen > skb_queue_len(&sk->sk_receive_queue)) | |
634 | qlen = skb_queue_len(&sk->sk_receive_queue); | |
1da177e4 | 635 | |
09e14305 | 636 | for (; qlen; qlen--) { |
2a0a6ebe | 637 | skb = skb_dequeue(&sk->sk_receive_queue); |
1da177e4 | 638 | if (rtnetlink_rcv_skb(skb)) { |
09e14305 | 639 | if (skb->len) |
1da177e4 LT |
640 | skb_queue_head(&sk->sk_receive_queue, |
641 | skb); | |
0f4821e7 | 642 | else { |
1da177e4 | 643 | kfree_skb(skb); |
0f4821e7 DM |
644 | qlen--; |
645 | } | |
1da177e4 LT |
646 | break; |
647 | } | |
648 | kfree_skb(skb); | |
649 | } | |
650 | ||
651 | up(&rtnl_sem); | |
652 | ||
653 | netdev_run_todo(); | |
2a0a6ebe | 654 | } while (qlen); |
1da177e4 LT |
655 | } |
656 | ||
db46edc6 | 657 | static struct rtnetlink_link link_rtnetlink_table[RTM_NR_MSGTYPES] = |
1da177e4 | 658 | { |
c7fb64db TG |
659 | [RTM_GETLINK - RTM_BASE] = { .dumpit = rtnetlink_dump_ifinfo }, |
660 | [RTM_SETLINK - RTM_BASE] = { .doit = do_setlink }, | |
661 | [RTM_GETADDR - RTM_BASE] = { .dumpit = rtnetlink_dump_all }, | |
662 | [RTM_GETROUTE - RTM_BASE] = { .dumpit = rtnetlink_dump_all }, | |
663 | [RTM_NEWNEIGH - RTM_BASE] = { .doit = neigh_add }, | |
664 | [RTM_DELNEIGH - RTM_BASE] = { .doit = neigh_delete }, | |
665 | [RTM_GETNEIGH - RTM_BASE] = { .dumpit = neigh_dump_info }, | |
666 | [RTM_GETRULE - RTM_BASE] = { .dumpit = rtnetlink_dump_all }, | |
667 | [RTM_GETNEIGHTBL - RTM_BASE] = { .dumpit = neightbl_dump_info }, | |
668 | [RTM_SETNEIGHTBL - RTM_BASE] = { .doit = neightbl_set }, | |
1da177e4 LT |
669 | }; |
670 | ||
671 | static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr) | |
672 | { | |
673 | struct net_device *dev = ptr; | |
674 | switch (event) { | |
675 | case NETDEV_UNREGISTER: | |
676 | rtmsg_ifinfo(RTM_DELLINK, dev, ~0U); | |
677 | break; | |
678 | case NETDEV_REGISTER: | |
679 | rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U); | |
680 | break; | |
681 | case NETDEV_UP: | |
682 | case NETDEV_DOWN: | |
683 | rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING); | |
684 | break; | |
685 | case NETDEV_CHANGE: | |
686 | case NETDEV_GOING_DOWN: | |
687 | break; | |
688 | default: | |
689 | rtmsg_ifinfo(RTM_NEWLINK, dev, 0); | |
690 | break; | |
691 | } | |
692 | return NOTIFY_DONE; | |
693 | } | |
694 | ||
695 | static struct notifier_block rtnetlink_dev_notifier = { | |
696 | .notifier_call = rtnetlink_event, | |
697 | }; | |
698 | ||
699 | void __init rtnetlink_init(void) | |
700 | { | |
701 | int i; | |
702 | ||
703 | rtattr_max = 0; | |
704 | for (i = 0; i < ARRAY_SIZE(rta_max); i++) | |
705 | if (rta_max[i] > rtattr_max) | |
706 | rtattr_max = rta_max[i]; | |
707 | rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL); | |
708 | if (!rta_buf) | |
709 | panic("rtnetlink_init: cannot allocate rta_buf\n"); | |
710 | ||
4fdb3bb7 | 711 | rtnl = netlink_kernel_create(NETLINK_ROUTE, rtnetlink_rcv, THIS_MODULE); |
1da177e4 LT |
712 | if (rtnl == NULL) |
713 | panic("rtnetlink_init: cannot initialize rtnetlink\n"); | |
714 | netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV); | |
715 | register_netdevice_notifier(&rtnetlink_dev_notifier); | |
716 | rtnetlink_links[PF_UNSPEC] = link_rtnetlink_table; | |
717 | rtnetlink_links[PF_PACKET] = link_rtnetlink_table; | |
718 | } | |
719 | ||
720 | EXPORT_SYMBOL(__rta_fill); | |
721 | EXPORT_SYMBOL(rtattr_strlcpy); | |
722 | EXPORT_SYMBOL(rtattr_parse); | |
723 | EXPORT_SYMBOL(rtnetlink_links); | |
724 | EXPORT_SYMBOL(rtnetlink_put_metrics); | |
725 | EXPORT_SYMBOL(rtnl); | |
726 | EXPORT_SYMBOL(rtnl_lock); | |
727 | EXPORT_SYMBOL(rtnl_lock_interruptible); | |
728 | EXPORT_SYMBOL(rtnl_sem); | |
729 | EXPORT_SYMBOL(rtnl_unlock); |