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[IPv4]: Move interface address bits to linux/if_addr.h
[usb.git] / net / core / rtnetlink.c
blob35712031e2c331c40566f22f9d8f4da58840bed9
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/errno.h>
20 #include <linux/module.h>
21 #include <linux/types.h>
22 #include <linux/socket.h>
23 #include <linux/kernel.h>
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>
37 #include <linux/mutex.h>
38 #include <linux/if_addr.h>
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>
53 #include <net/fib_rules.h>
54 #include <net/netlink.h>
55 #ifdef CONFIG_NET_WIRELESS_RTNETLINK
56 #include <linux/wireless.h>
57 #include <net/iw_handler.h>
58 #endif /* CONFIG_NET_WIRELESS_RTNETLINK */
59
60 static DEFINE_MUTEX(rtnl_mutex);
61
62 void rtnl_lock(void)
63 {
64 mutex_lock(&rtnl_mutex);
65 }
66
67 void __rtnl_unlock(void)
68 {
69 mutex_unlock(&rtnl_mutex);
70 }
71
72 void rtnl_unlock(void)
73 {
74 mutex_unlock(&rtnl_mutex);
75 if (rtnl && rtnl->sk_receive_queue.qlen)
76 rtnl->sk_data_ready(rtnl, 0);
77 netdev_run_todo();
78 }
79
80 int rtnl_trylock(void)
81 {
82 return mutex_trylock(&rtnl_mutex);
83 }
84
85 int rtattr_parse(struct rtattr *tb[], int maxattr, struct rtattr *rta, int len)
86 {
87 memset(tb, 0, sizeof(struct rtattr*)*maxattr);
88
89 while (RTA_OK(rta, len)) {
90 unsigned flavor = rta->rta_type;
91 if (flavor && flavor <= maxattr)
92 tb[flavor-1] = rta;
93 rta = RTA_NEXT(rta, len);
94 }
95 return 0;
96 }
97
98 struct sock *rtnl;
99
100 struct rtnetlink_link * rtnetlink_links[NPROTO];
101
102 static const int rtm_min[RTM_NR_FAMILIES] =
103 {
104 [RTM_FAM(RTM_NEWLINK)] = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
105 [RTM_FAM(RTM_NEWADDR)] = NLMSG_LENGTH(sizeof(struct ifaddrmsg)),
106 [RTM_FAM(RTM_NEWROUTE)] = NLMSG_LENGTH(sizeof(struct rtmsg)),
107 [RTM_FAM(RTM_NEWNEIGH)] = NLMSG_LENGTH(sizeof(struct ndmsg)),
108 [RTM_FAM(RTM_NEWRULE)] = NLMSG_LENGTH(sizeof(struct fib_rule_hdr)),
109 [RTM_FAM(RTM_NEWQDISC)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
110 [RTM_FAM(RTM_NEWTCLASS)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
111 [RTM_FAM(RTM_NEWTFILTER)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
112 [RTM_FAM(RTM_NEWACTION)] = NLMSG_LENGTH(sizeof(struct tcamsg)),
113 [RTM_FAM(RTM_NEWPREFIX)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
114 [RTM_FAM(RTM_GETMULTICAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
115 [RTM_FAM(RTM_GETANYCAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
116 [RTM_FAM(RTM_NEWNEIGHTBL)] = NLMSG_LENGTH(sizeof(struct ndtmsg)),
117 };
118
119 static const int rta_max[RTM_NR_FAMILIES] =
120 {
121 [RTM_FAM(RTM_NEWLINK)] = IFLA_MAX,
122 [RTM_FAM(RTM_NEWADDR)] = IFA_MAX,
123 [RTM_FAM(RTM_NEWROUTE)] = RTA_MAX,
124 [RTM_FAM(RTM_NEWNEIGH)] = NDA_MAX,
125 [RTM_FAM(RTM_NEWRULE)] = FRA_MAX,
126 [RTM_FAM(RTM_NEWQDISC)] = TCA_MAX,
127 [RTM_FAM(RTM_NEWTCLASS)] = TCA_MAX,
128 [RTM_FAM(RTM_NEWTFILTER)] = TCA_MAX,
129 [RTM_FAM(RTM_NEWACTION)] = TCAA_MAX,
130 [RTM_FAM(RTM_NEWNEIGHTBL)] = NDTA_MAX,
131 };
132
133 void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const void *data)
134 {
135 struct rtattr *rta;
136 int size = RTA_LENGTH(attrlen);
137
138 rta = (struct rtattr*)skb_put(skb, RTA_ALIGN(size));
139 rta->rta_type = attrtype;
140 rta->rta_len = size;
141 memcpy(RTA_DATA(rta), data, attrlen);
142 memset(RTA_DATA(rta) + attrlen, 0, RTA_ALIGN(size) - size);
143 }
144
145 size_t rtattr_strlcpy(char *dest, const struct rtattr *rta, size_t size)
146 {
147 size_t ret = RTA_PAYLOAD(rta);
148 char *src = RTA_DATA(rta);
149
150 if (ret > 0 && src[ret - 1] == '\0')
151 ret--;
152 if (size > 0) {
153 size_t len = (ret >= size) ? size - 1 : ret;
154 memset(dest, 0, size);
155 memcpy(dest, src, len);
156 }
157 return ret;
158 }
159
160 int rtnetlink_send(struct sk_buff *skb, u32 pid, unsigned group, int echo)
161 {
162 int err = 0;
163
164 NETLINK_CB(skb).dst_group = group;
165 if (echo)
166 atomic_inc(&skb->users);
167 netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL);
168 if (echo)
169 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
170 return err;
171 }
172
173 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics)
174 {
175 struct rtattr *mx = (struct rtattr*)skb->tail;
176 int i;
177
178 RTA_PUT(skb, RTA_METRICS, 0, NULL);
179 for (i=0; i<RTAX_MAX; i++) {
180 if (metrics[i])
181 RTA_PUT(skb, i+1, sizeof(u32), metrics+i);
182 }
183 mx->rta_len = skb->tail - (u8*)mx;
184 if (mx->rta_len == RTA_LENGTH(0))
185 skb_trim(skb, (u8*)mx - skb->data);
186 return 0;
187
188 rtattr_failure:
189 skb_trim(skb, (u8*)mx - skb->data);
190 return -1;
191 }
192
193
194 static void set_operstate(struct net_device *dev, unsigned char transition)
195 {
196 unsigned char operstate = dev->operstate;
197
198 switch(transition) {
199 case IF_OPER_UP:
200 if ((operstate == IF_OPER_DORMANT ||
201 operstate == IF_OPER_UNKNOWN) &&
202 !netif_dormant(dev))
203 operstate = IF_OPER_UP;
204 break;
205
206 case IF_OPER_DORMANT:
207 if (operstate == IF_OPER_UP ||
208 operstate == IF_OPER_UNKNOWN)
209 operstate = IF_OPER_DORMANT;
210 break;
211 };
212
213 if (dev->operstate != operstate) {
214 write_lock_bh(&dev_base_lock);
215 dev->operstate = operstate;
216 write_unlock_bh(&dev_base_lock);
217 netdev_state_change(dev);
218 }
219 }
220
221 static int rtnetlink_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
222 int type, u32 pid, u32 seq, u32 change,
223 unsigned int flags)
224 {
225 struct ifinfomsg *r;
226 struct nlmsghdr *nlh;
227 unsigned char *b = skb->tail;
228
229 nlh = NLMSG_NEW(skb, pid, seq, type, sizeof(*r), flags);
230 r = NLMSG_DATA(nlh);
231 r->ifi_family = AF_UNSPEC;
232 r->__ifi_pad = 0;
233 r->ifi_type = dev->type;
234 r->ifi_index = dev->ifindex;
235 r->ifi_flags = dev_get_flags(dev);
236 r->ifi_change = change;
237
238 RTA_PUT(skb, IFLA_IFNAME, strlen(dev->name)+1, dev->name);
239
240 if (1) {
241 u32 txqlen = dev->tx_queue_len;
242 RTA_PUT(skb, IFLA_TXQLEN, sizeof(txqlen), &txqlen);
243 }
244
245 if (1) {
246 u32 weight = dev->weight;
247 RTA_PUT(skb, IFLA_WEIGHT, sizeof(weight), &weight);
248 }
249
250 if (1) {
251 u8 operstate = netif_running(dev)?dev->operstate:IF_OPER_DOWN;
252 u8 link_mode = dev->link_mode;
253 RTA_PUT(skb, IFLA_OPERSTATE, sizeof(operstate), &operstate);
254 RTA_PUT(skb, IFLA_LINKMODE, sizeof(link_mode), &link_mode);
255 }
256
257 if (1) {
258 struct rtnl_link_ifmap map = {
259 .mem_start = dev->mem_start,
260 .mem_end = dev->mem_end,
261 .base_addr = dev->base_addr,
262 .irq = dev->irq,
263 .dma = dev->dma,
264 .port = dev->if_port,
265 };
266 RTA_PUT(skb, IFLA_MAP, sizeof(map), &map);
267 }
268
269 if (dev->addr_len) {
270 RTA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
271 RTA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast);
272 }
273
274 if (1) {
275 u32 mtu = dev->mtu;
276 RTA_PUT(skb, IFLA_MTU, sizeof(mtu), &mtu);
277 }
278
279 if (dev->ifindex != dev->iflink) {
280 u32 iflink = dev->iflink;
281 RTA_PUT(skb, IFLA_LINK, sizeof(iflink), &iflink);
282 }
283
284 if (dev->qdisc_sleeping)
285 RTA_PUT(skb, IFLA_QDISC,
286 strlen(dev->qdisc_sleeping->ops->id) + 1,
287 dev->qdisc_sleeping->ops->id);
288
289 if (dev->master) {
290 u32 master = dev->master->ifindex;
291 RTA_PUT(skb, IFLA_MASTER, sizeof(master), &master);
292 }
293
294 if (dev->get_stats) {
295 unsigned long *stats = (unsigned long*)dev->get_stats(dev);
296 if (stats) {
297 struct rtattr *a;
298 __u32 *s;
299 int i;
300 int n = sizeof(struct rtnl_link_stats)/4;
301
302 a = __RTA_PUT(skb, IFLA_STATS, n*4);
303 s = RTA_DATA(a);
304 for (i=0; i<n; i++)
305 s[i] = stats[i];
306 }
307 }
308 nlh->nlmsg_len = skb->tail - b;
309 return skb->len;
310
311 nlmsg_failure:
312 rtattr_failure:
313 skb_trim(skb, b - skb->data);
314 return -1;
315 }
316
317 static int rtnetlink_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
318 {
319 int idx;
320 int s_idx = cb->args[0];
321 struct net_device *dev;
322
323 read_lock(&dev_base_lock);
324 for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) {
325 if (idx < s_idx)
326 continue;
327 if (rtnetlink_fill_ifinfo(skb, dev, RTM_NEWLINK,
328 NETLINK_CB(cb->skb).pid,
329 cb->nlh->nlmsg_seq, 0,
330 NLM_F_MULTI) <= 0)
331 break;
332 }
333 read_unlock(&dev_base_lock);
334 cb->args[0] = idx;
335
336 return skb->len;
337 }
338
339 static int do_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
340 {
341 struct ifinfomsg *ifm = NLMSG_DATA(nlh);
342 struct rtattr **ida = arg;
343 struct net_device *dev;
344 int err, send_addr_notify = 0;
345
346 if (ifm->ifi_index >= 0)
347 dev = dev_get_by_index(ifm->ifi_index);
348 else if (ida[IFLA_IFNAME - 1]) {
349 char ifname[IFNAMSIZ];
350
351 if (rtattr_strlcpy(ifname, ida[IFLA_IFNAME - 1],
352 IFNAMSIZ) >= IFNAMSIZ)
353 return -EINVAL;
354 dev = dev_get_by_name(ifname);
355 } else
356 return -EINVAL;
357
358 if (!dev)
359 return -ENODEV;
360
361 err = -EINVAL;
362
363 if (ifm->ifi_flags)
364 dev_change_flags(dev, ifm->ifi_flags);
365
366 if (ida[IFLA_MAP - 1]) {
367 struct rtnl_link_ifmap *u_map;
368 struct ifmap k_map;
369
370 if (!dev->set_config) {
371 err = -EOPNOTSUPP;
372 goto out;
373 }
374
375 if (!netif_device_present(dev)) {
376 err = -ENODEV;
377 goto out;
378 }
379
380 if (ida[IFLA_MAP - 1]->rta_len != RTA_LENGTH(sizeof(*u_map)))
381 goto out;
382
383 u_map = RTA_DATA(ida[IFLA_MAP - 1]);
384
385 k_map.mem_start = (unsigned long) u_map->mem_start;
386 k_map.mem_end = (unsigned long) u_map->mem_end;
387 k_map.base_addr = (unsigned short) u_map->base_addr;
388 k_map.irq = (unsigned char) u_map->irq;
389 k_map.dma = (unsigned char) u_map->dma;
390 k_map.port = (unsigned char) u_map->port;
391
392 err = dev->set_config(dev, &k_map);
393
394 if (err)
395 goto out;
396 }
397
398 if (ida[IFLA_ADDRESS - 1]) {
399 struct sockaddr *sa;
400 int len;
401
402 if (!dev->set_mac_address) {
403 err = -EOPNOTSUPP;
404 goto out;
405 }
406 if (!netif_device_present(dev)) {
407 err = -ENODEV;
408 goto out;
409 }
410 if (ida[IFLA_ADDRESS - 1]->rta_len != RTA_LENGTH(dev->addr_len))
411 goto out;
412
413 len = sizeof(sa_family_t) + dev->addr_len;
414 sa = kmalloc(len, GFP_KERNEL);
415 if (!sa) {
416 err = -ENOMEM;
417 goto out;
418 }
419 sa->sa_family = dev->type;
420 memcpy(sa->sa_data, RTA_DATA(ida[IFLA_ADDRESS - 1]),
421 dev->addr_len);
422 err = dev->set_mac_address(dev, sa);
423 kfree(sa);
424 if (err)
425 goto out;
426 send_addr_notify = 1;
427 }
428
429 if (ida[IFLA_BROADCAST - 1]) {
430 if (ida[IFLA_BROADCAST - 1]->rta_len != RTA_LENGTH(dev->addr_len))
431 goto out;
432 memcpy(dev->broadcast, RTA_DATA(ida[IFLA_BROADCAST - 1]),
433 dev->addr_len);
434 send_addr_notify = 1;
435 }
436
437 if (ida[IFLA_MTU - 1]) {
438 if (ida[IFLA_MTU - 1]->rta_len != RTA_LENGTH(sizeof(u32)))
439 goto out;
440 err = dev_set_mtu(dev, *((u32 *) RTA_DATA(ida[IFLA_MTU - 1])));
441
442 if (err)
443 goto out;
444
445 }
446
447 if (ida[IFLA_TXQLEN - 1]) {
448 if (ida[IFLA_TXQLEN - 1]->rta_len != RTA_LENGTH(sizeof(u32)))
449 goto out;
450
451 dev->tx_queue_len = *((u32 *) RTA_DATA(ida[IFLA_TXQLEN - 1]));
452 }
453
454 if (ida[IFLA_WEIGHT - 1]) {
455 if (ida[IFLA_WEIGHT - 1]->rta_len != RTA_LENGTH(sizeof(u32)))
456 goto out;
457
458 dev->weight = *((u32 *) RTA_DATA(ida[IFLA_WEIGHT - 1]));
459 }
460
461 if (ida[IFLA_OPERSTATE - 1]) {
462 if (ida[IFLA_OPERSTATE - 1]->rta_len != RTA_LENGTH(sizeof(u8)))
463 goto out;
464
465 set_operstate(dev, *((u8 *) RTA_DATA(ida[IFLA_OPERSTATE - 1])));
466 }
467
468 if (ida[IFLA_LINKMODE - 1]) {
469 if (ida[IFLA_LINKMODE - 1]->rta_len != RTA_LENGTH(sizeof(u8)))
470 goto out;
471
472 write_lock_bh(&dev_base_lock);
473 dev->link_mode = *((u8 *) RTA_DATA(ida[IFLA_LINKMODE - 1]));
474 write_unlock_bh(&dev_base_lock);
475 }
476
477 if (ifm->ifi_index >= 0 && ida[IFLA_IFNAME - 1]) {
478 char ifname[IFNAMSIZ];
479
480 if (rtattr_strlcpy(ifname, ida[IFLA_IFNAME - 1],
481 IFNAMSIZ) >= IFNAMSIZ)
482 goto out;
483 err = dev_change_name(dev, ifname);
484 if (err)
485 goto out;
486 }
487
488 #ifdef CONFIG_NET_WIRELESS_RTNETLINK
489 if (ida[IFLA_WIRELESS - 1]) {
490
491 /* Call Wireless Extensions.
492 * Various stuff checked in there... */
493 err = wireless_rtnetlink_set(dev, RTA_DATA(ida[IFLA_WIRELESS - 1]), ida[IFLA_WIRELESS - 1]->rta_len);
494 if (err)
495 goto out;
496 }
497 #endif /* CONFIG_NET_WIRELESS_RTNETLINK */
498
499 err = 0;
500
501 out:
502 if (send_addr_notify)
503 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
504
505 dev_put(dev);
506 return err;
507 }
508
509 #ifdef CONFIG_NET_WIRELESS_RTNETLINK
510 static int do_getlink(struct sk_buff *in_skb, struct nlmsghdr* in_nlh, void *arg)
511 {
512 struct ifinfomsg *ifm = NLMSG_DATA(in_nlh);
513 struct rtattr **ida = arg;
514 struct net_device *dev;
515 struct ifinfomsg *r;
516 struct nlmsghdr *nlh;
517 int err = -ENOBUFS;
518 struct sk_buff *skb;
519 unsigned char *b;
520 char *iw_buf = NULL;
521 int iw_buf_len = 0;
522
523 if (ifm->ifi_index >= 0)
524 dev = dev_get_by_index(ifm->ifi_index);
525 else
526 return -EINVAL;
527 if (!dev)
528 return -ENODEV;
529
530 #ifdef CONFIG_NET_WIRELESS_RTNETLINK
531 if (ida[IFLA_WIRELESS - 1]) {
532
533 /* Call Wireless Extensions. We need to know the size before
534 * we can alloc. Various stuff checked in there... */
535 err = wireless_rtnetlink_get(dev, RTA_DATA(ida[IFLA_WIRELESS - 1]), ida[IFLA_WIRELESS - 1]->rta_len, &iw_buf, &iw_buf_len);
536 if (err)
537 goto out;
538 }
539 #endif /* CONFIG_NET_WIRELESS_RTNETLINK */
540
541 /* Create a skb big enough to include all the data.
542 * Some requests are way bigger than 4k... Jean II */
543 skb = alloc_skb((NLMSG_LENGTH(sizeof(*r))) + (RTA_SPACE(iw_buf_len)),
544 GFP_KERNEL);
545 if (!skb)
546 goto out;
547 b = skb->tail;
548
549 /* Put in the message the usual good stuff */
550 nlh = NLMSG_PUT(skb, NETLINK_CB(in_skb).pid, in_nlh->nlmsg_seq,
551 RTM_NEWLINK, sizeof(*r));
552 r = NLMSG_DATA(nlh);
553 r->ifi_family = AF_UNSPEC;
554 r->__ifi_pad = 0;
555 r->ifi_type = dev->type;
556 r->ifi_index = dev->ifindex;
557 r->ifi_flags = dev->flags;
558 r->ifi_change = 0;
559
560 /* Put the wireless payload if it exist */
561 if(iw_buf != NULL)
562 RTA_PUT(skb, IFLA_WIRELESS, iw_buf_len,
563 iw_buf + IW_EV_POINT_OFF);
564
565 nlh->nlmsg_len = skb->tail - b;
566
567 /* Needed ? */
568 NETLINK_CB(skb).dst_pid = NETLINK_CB(in_skb).pid;
569
570 err = netlink_unicast(rtnl, skb, NETLINK_CB(in_skb).pid, MSG_DONTWAIT);
571 if (err > 0)
572 err = 0;
573 out:
574 if(iw_buf != NULL)
575 kfree(iw_buf);
576 dev_put(dev);
577 return err;
578
579 rtattr_failure:
580 nlmsg_failure:
581 kfree_skb(skb);
582 goto out;
583 }
584 #endif /* CONFIG_NET_WIRELESS_RTNETLINK */
585
586 static int rtnetlink_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
587 {
588 int idx;
589 int s_idx = cb->family;
590
591 if (s_idx == 0)
592 s_idx = 1;
593 for (idx=1; idx<NPROTO; idx++) {
594 int type = cb->nlh->nlmsg_type-RTM_BASE;
595 if (idx < s_idx || idx == PF_PACKET)
596 continue;
597 if (rtnetlink_links[idx] == NULL ||
598 rtnetlink_links[idx][type].dumpit == NULL)
599 continue;
600 if (idx > s_idx)
601 memset(&cb->args[0], 0, sizeof(cb->args));
602 if (rtnetlink_links[idx][type].dumpit(skb, cb))
603 break;
604 }
605 cb->family = idx;
606
607 return skb->len;
608 }
609
610 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change)
611 {
612 struct sk_buff *skb;
613 int size = NLMSG_SPACE(sizeof(struct ifinfomsg) +
614 sizeof(struct rtnl_link_ifmap) +
615 sizeof(struct rtnl_link_stats) + 128);
616
617 skb = alloc_skb(size, GFP_KERNEL);
618 if (!skb)
619 return;
620
621 if (rtnetlink_fill_ifinfo(skb, dev, type, 0, 0, change, 0) < 0) {
622 kfree_skb(skb);
623 return;
624 }
625 NETLINK_CB(skb).dst_group = RTNLGRP_LINK;
626 netlink_broadcast(rtnl, skb, 0, RTNLGRP_LINK, GFP_KERNEL);
627 }
628
629 /* Protected by RTNL sempahore. */
630 static struct rtattr **rta_buf;
631 static int rtattr_max;
632
633 /* Process one rtnetlink message. */
634
635 static __inline__ int
636 rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, int *errp)
637 {
638 struct rtnetlink_link *link;
639 struct rtnetlink_link *link_tab;
640 int sz_idx, kind;
641 int min_len;
642 int family;
643 int type;
644 int err;
645
646 /* Only requests are handled by kernel now */
647 if (!(nlh->nlmsg_flags&NLM_F_REQUEST))
648 return 0;
649
650 type = nlh->nlmsg_type;
651
652 /* A control message: ignore them */
653 if (type < RTM_BASE)
654 return 0;
655
656 /* Unknown message: reply with EINVAL */
657 if (type > RTM_MAX)
658 goto err_inval;
659
660 type -= RTM_BASE;
661
662 /* All the messages must have at least 1 byte length */
663 if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg)))
664 return 0;
665
666 family = ((struct rtgenmsg*)NLMSG_DATA(nlh))->rtgen_family;
667 if (family >= NPROTO) {
668 *errp = -EAFNOSUPPORT;
669 return -1;
670 }
671
672 link_tab = rtnetlink_links[family];
673 if (link_tab == NULL)
674 link_tab = rtnetlink_links[PF_UNSPEC];
675 link = &link_tab[type];
676
677 sz_idx = type>>2;
678 kind = type&3;
679
680 if (kind != 2 && security_netlink_recv(skb, CAP_NET_ADMIN)) {
681 *errp = -EPERM;
682 return -1;
683 }
684
685 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
686 if (link->dumpit == NULL)
687 link = &(rtnetlink_links[PF_UNSPEC][type]);
688
689 if (link->dumpit == NULL)
690 goto err_inval;
691
692 if ((*errp = netlink_dump_start(rtnl, skb, nlh,
693 link->dumpit, NULL)) != 0) {
694 return -1;
695 }
696
697 netlink_queue_skip(nlh, skb);
698 return -1;
699 }
700
701 memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *)));
702
703 min_len = rtm_min[sz_idx];
704 if (nlh->nlmsg_len < min_len)
705 goto err_inval;
706
707 if (nlh->nlmsg_len > min_len) {
708 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
709 struct rtattr *attr = (void*)nlh + NLMSG_ALIGN(min_len);
710
711 while (RTA_OK(attr, attrlen)) {
712 unsigned flavor = attr->rta_type;
713 if (flavor) {
714 if (flavor > rta_max[sz_idx])
715 goto err_inval;
716 rta_buf[flavor-1] = attr;
717 }
718 attr = RTA_NEXT(attr, attrlen);
719 }
720 }
721
722 if (link->doit == NULL)
723 link = &(rtnetlink_links[PF_UNSPEC][type]);
724 if (link->doit == NULL)
725 goto err_inval;
726 err = link->doit(skb, nlh, (void *)&rta_buf[0]);
727
728 *errp = err;
729 return err;
730
731 err_inval:
732 *errp = -EINVAL;
733 return -1;
734 }
735
736 static void rtnetlink_rcv(struct sock *sk, int len)
737 {
738 unsigned int qlen = 0;
739
740 do {
741 mutex_lock(&rtnl_mutex);
742 netlink_run_queue(sk, &qlen, &rtnetlink_rcv_msg);
743 mutex_unlock(&rtnl_mutex);
744
745 netdev_run_todo();
746 } while (qlen);
747 }
748
749 static struct rtnetlink_link link_rtnetlink_table[RTM_NR_MSGTYPES] =
750 {
751 [RTM_GETLINK - RTM_BASE] = {
752 #ifdef CONFIG_NET_WIRELESS_RTNETLINK
753 .doit = do_getlink,
754 #endif /* CONFIG_NET_WIRELESS_RTNETLINK */
755 .dumpit = rtnetlink_dump_ifinfo },
756 [RTM_SETLINK - RTM_BASE] = { .doit = do_setlink },
757 [RTM_GETADDR - RTM_BASE] = { .dumpit = rtnetlink_dump_all },
758 [RTM_GETROUTE - RTM_BASE] = { .dumpit = rtnetlink_dump_all },
759 [RTM_NEWNEIGH - RTM_BASE] = { .doit = neigh_add },
760 [RTM_DELNEIGH - RTM_BASE] = { .doit = neigh_delete },
761 [RTM_GETNEIGH - RTM_BASE] = { .dumpit = neigh_dump_info },
762 #ifdef CONFIG_FIB_RULES
763 [RTM_NEWRULE - RTM_BASE] = { .doit = fib_nl_newrule },
764 [RTM_DELRULE - RTM_BASE] = { .doit = fib_nl_delrule },
765 #endif
766 [RTM_GETRULE - RTM_BASE] = { .dumpit = rtnetlink_dump_all },
767 [RTM_GETNEIGHTBL - RTM_BASE] = { .dumpit = neightbl_dump_info },
768 [RTM_SETNEIGHTBL - RTM_BASE] = { .doit = neightbl_set },
769 };
770
771 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
772 {
773 struct net_device *dev = ptr;
774 switch (event) {
775 case NETDEV_UNREGISTER:
776 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);
777 break;
778 case NETDEV_REGISTER:
779 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
780 break;
781 case NETDEV_UP:
782 case NETDEV_DOWN:
783 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
784 break;
785 case NETDEV_CHANGE:
786 case NETDEV_GOING_DOWN:
787 break;
788 default:
789 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
790 break;
791 }
792 return NOTIFY_DONE;
793 }
794
795 static struct notifier_block rtnetlink_dev_notifier = {
796 .notifier_call = rtnetlink_event,
797 };
798
799 void __init rtnetlink_init(void)
800 {
801 int i;
802
803 rtattr_max = 0;
804 for (i = 0; i < ARRAY_SIZE(rta_max); i++)
805 if (rta_max[i] > rtattr_max)
806 rtattr_max = rta_max[i];
807 rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL);
808 if (!rta_buf)
809 panic("rtnetlink_init: cannot allocate rta_buf\n");
810
811 rtnl = netlink_kernel_create(NETLINK_ROUTE, RTNLGRP_MAX, rtnetlink_rcv,
812 THIS_MODULE);
813 if (rtnl == NULL)
814 panic("rtnetlink_init: cannot initialize rtnetlink\n");
815 netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV);
816 register_netdevice_notifier(&rtnetlink_dev_notifier);
817 rtnetlink_links[PF_UNSPEC] = link_rtnetlink_table;
818 rtnetlink_links[PF_PACKET] = link_rtnetlink_table;
819 }
820
821 EXPORT_SYMBOL(__rta_fill);
822 EXPORT_SYMBOL(rtattr_strlcpy);
823 EXPORT_SYMBOL(rtattr_parse);
824 EXPORT_SYMBOL(rtnetlink_links);
825 EXPORT_SYMBOL(rtnetlink_put_metrics);
826 EXPORT_SYMBOL(rtnl);
827 EXPORT_SYMBOL(rtnl_lock);
828 EXPORT_SYMBOL(rtnl_trylock);
829 EXPORT_SYMBOL(rtnl_unlock);
USB Experimental Work