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[NEIGH]: Move netlink neighbour bits to linux/neighbour.h
[usb.git] / net / core / rtnetlink.c
blob78ccbd4c4e3767f5d9f2577a49dd10c552607fa2
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_NEWRULE)] = NLMSG_LENGTH(sizeof(struct fib_rule_hdr)),
108 [RTM_FAM(RTM_NEWQDISC)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
109 [RTM_FAM(RTM_NEWTCLASS)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
110 [RTM_FAM(RTM_NEWTFILTER)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
111 [RTM_FAM(RTM_NEWACTION)] = NLMSG_LENGTH(sizeof(struct tcamsg)),
112 [RTM_FAM(RTM_NEWPREFIX)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
113 [RTM_FAM(RTM_GETMULTICAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
114 [RTM_FAM(RTM_GETANYCAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
115 [RTM_FAM(RTM_NEWNEIGHTBL)] = NLMSG_LENGTH(sizeof(struct ndtmsg)),
116 };
117
118 static const int rta_max[RTM_NR_FAMILIES] =
119 {
120 [RTM_FAM(RTM_NEWLINK)] = IFLA_MAX,
121 [RTM_FAM(RTM_NEWADDR)] = IFA_MAX,
122 [RTM_FAM(RTM_NEWROUTE)] = RTA_MAX,
123 [RTM_FAM(RTM_NEWRULE)] = FRA_MAX,
124 [RTM_FAM(RTM_NEWQDISC)] = TCA_MAX,
125 [RTM_FAM(RTM_NEWTCLASS)] = TCA_MAX,
126 [RTM_FAM(RTM_NEWTFILTER)] = TCA_MAX,
127 [RTM_FAM(RTM_NEWACTION)] = TCAA_MAX,
128 [RTM_FAM(RTM_NEWNEIGHTBL)] = NDTA_MAX,
129 };
130
131 void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const void *data)
132 {
133 struct rtattr *rta;
134 int size = RTA_LENGTH(attrlen);
135
136 rta = (struct rtattr*)skb_put(skb, RTA_ALIGN(size));
137 rta->rta_type = attrtype;
138 rta->rta_len = size;
139 memcpy(RTA_DATA(rta), data, attrlen);
140 memset(RTA_DATA(rta) + attrlen, 0, RTA_ALIGN(size) - size);
141 }
142
143 size_t rtattr_strlcpy(char *dest, const struct rtattr *rta, size_t size)
144 {
145 size_t ret = RTA_PAYLOAD(rta);
146 char *src = RTA_DATA(rta);
147
148 if (ret > 0 && src[ret - 1] == '\0')
149 ret--;
150 if (size > 0) {
151 size_t len = (ret >= size) ? size - 1 : ret;
152 memset(dest, 0, size);
153 memcpy(dest, src, len);
154 }
155 return ret;
156 }
157
158 int rtnetlink_send(struct sk_buff *skb, u32 pid, unsigned group, int echo)
159 {
160 int err = 0;
161
162 NETLINK_CB(skb).dst_group = group;
163 if (echo)
164 atomic_inc(&skb->users);
165 netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL);
166 if (echo)
167 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
168 return err;
169 }
170
171 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics)
172 {
173 struct rtattr *mx = (struct rtattr*)skb->tail;
174 int i;
175
176 RTA_PUT(skb, RTA_METRICS, 0, NULL);
177 for (i=0; i<RTAX_MAX; i++) {
178 if (metrics[i])
179 RTA_PUT(skb, i+1, sizeof(u32), metrics+i);
180 }
181 mx->rta_len = skb->tail - (u8*)mx;
182 if (mx->rta_len == RTA_LENGTH(0))
183 skb_trim(skb, (u8*)mx - skb->data);
184 return 0;
185
186 rtattr_failure:
187 skb_trim(skb, (u8*)mx - skb->data);
188 return -1;
189 }
190
191
192 static void set_operstate(struct net_device *dev, unsigned char transition)
193 {
194 unsigned char operstate = dev->operstate;
195
196 switch(transition) {
197 case IF_OPER_UP:
198 if ((operstate == IF_OPER_DORMANT ||
199 operstate == IF_OPER_UNKNOWN) &&
200 !netif_dormant(dev))
201 operstate = IF_OPER_UP;
202 break;
203
204 case IF_OPER_DORMANT:
205 if (operstate == IF_OPER_UP ||
206 operstate == IF_OPER_UNKNOWN)
207 operstate = IF_OPER_DORMANT;
208 break;
209 };
210
211 if (dev->operstate != operstate) {
212 write_lock_bh(&dev_base_lock);
213 dev->operstate = operstate;
214 write_unlock_bh(&dev_base_lock);
215 netdev_state_change(dev);
216 }
217 }
218
219 static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
220 struct net_device_stats *b)
221 {
222 a->rx_packets = b->rx_packets;
223 a->tx_packets = b->tx_packets;
224 a->rx_bytes = b->rx_bytes;
225 a->tx_bytes = b->tx_bytes;
226 a->rx_errors = b->rx_errors;
227 a->tx_errors = b->tx_errors;
228 a->rx_dropped = b->rx_dropped;
229 a->tx_dropped = b->tx_dropped;
230
231 a->multicast = b->multicast;
232 a->collisions = b->collisions;
233
234 a->rx_length_errors = b->rx_length_errors;
235 a->rx_over_errors = b->rx_over_errors;
236 a->rx_crc_errors = b->rx_crc_errors;
237 a->rx_frame_errors = b->rx_frame_errors;
238 a->rx_fifo_errors = b->rx_fifo_errors;
239 a->rx_missed_errors = b->rx_missed_errors;
240
241 a->tx_aborted_errors = b->tx_aborted_errors;
242 a->tx_carrier_errors = b->tx_carrier_errors;
243 a->tx_fifo_errors = b->tx_fifo_errors;
244 a->tx_heartbeat_errors = b->tx_heartbeat_errors;
245 a->tx_window_errors = b->tx_window_errors;
246
247 a->rx_compressed = b->rx_compressed;
248 a->tx_compressed = b->tx_compressed;
249 };
250
251 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
252 void *iwbuf, int iwbuflen, int type, u32 pid,
253 u32 seq, u32 change, unsigned int flags)
254 {
255 struct ifinfomsg *ifm;
256 struct nlmsghdr *nlh;
257
258 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
259 if (nlh == NULL)
260 return -ENOBUFS;
261
262 ifm = nlmsg_data(nlh);
263 ifm->ifi_family = AF_UNSPEC;
264 ifm->__ifi_pad = 0;
265 ifm->ifi_type = dev->type;
266 ifm->ifi_index = dev->ifindex;
267 ifm->ifi_flags = dev_get_flags(dev);
268 ifm->ifi_change = change;
269
270 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
271 NLA_PUT_U32(skb, IFLA_TXQLEN, dev->tx_queue_len);
272 NLA_PUT_U32(skb, IFLA_WEIGHT, dev->weight);
273 NLA_PUT_U8(skb, IFLA_OPERSTATE,
274 netif_running(dev) ? dev->operstate : IF_OPER_DOWN);
275 NLA_PUT_U8(skb, IFLA_LINKMODE, dev->link_mode);
276 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
277
278 if (dev->ifindex != dev->iflink)
279 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
280
281 if (dev->master)
282 NLA_PUT_U32(skb, IFLA_MASTER, dev->master->ifindex);
283
284 if (dev->qdisc_sleeping)
285 NLA_PUT_STRING(skb, IFLA_QDISC, dev->qdisc_sleeping->ops->id);
286
287 if (1) {
288 struct rtnl_link_ifmap map = {
289 .mem_start = dev->mem_start,
290 .mem_end = dev->mem_end,
291 .base_addr = dev->base_addr,
292 .irq = dev->irq,
293 .dma = dev->dma,
294 .port = dev->if_port,
295 };
296 NLA_PUT(skb, IFLA_MAP, sizeof(map), &map);
297 }
298
299 if (dev->addr_len) {
300 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
301 NLA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast);
302 }
303
304 if (dev->get_stats) {
305 struct net_device_stats *stats = dev->get_stats(dev);
306 if (stats) {
307 struct nlattr *attr;
308
309 attr = nla_reserve(skb, IFLA_STATS,
310 sizeof(struct rtnl_link_stats));
311 if (attr == NULL)
312 goto nla_put_failure;
313
314 copy_rtnl_link_stats(nla_data(attr), stats);
315 }
316 }
317
318 if (iwbuf)
319 NLA_PUT(skb, IFLA_WIRELESS, iwbuflen, iwbuf);
320
321 return nlmsg_end(skb, nlh);
322
323 nla_put_failure:
324 return nlmsg_cancel(skb, nlh);
325 }
326
327 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
328 {
329 int idx;
330 int s_idx = cb->args[0];
331 struct net_device *dev;
332
333 read_lock(&dev_base_lock);
334 for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) {
335 if (idx < s_idx)
336 continue;
337 if (rtnl_fill_ifinfo(skb, dev, NULL, 0, RTM_NEWLINK,
338 NETLINK_CB(cb->skb).pid,
339 cb->nlh->nlmsg_seq, 0, NLM_F_MULTI) <= 0)
340 break;
341 }
342 read_unlock(&dev_base_lock);
343 cb->args[0] = idx;
344
345 return skb->len;
346 }
347
348 static struct nla_policy ifla_policy[IFLA_MAX+1] __read_mostly = {
349 [IFLA_IFNAME] = { .type = NLA_STRING },
350 [IFLA_MAP] = { .minlen = sizeof(struct rtnl_link_ifmap) },
351 [IFLA_MTU] = { .type = NLA_U32 },
352 [IFLA_TXQLEN] = { .type = NLA_U32 },
353 [IFLA_WEIGHT] = { .type = NLA_U32 },
354 [IFLA_OPERSTATE] = { .type = NLA_U8 },
355 [IFLA_LINKMODE] = { .type = NLA_U8 },
356 };
357
358 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
359 {
360 struct ifinfomsg *ifm;
361 struct net_device *dev;
362 int err, send_addr_notify = 0, modified = 0;
363 struct nlattr *tb[IFLA_MAX+1];
364 char ifname[IFNAMSIZ];
365
366 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
367 if (err < 0)
368 goto errout;
369
370 if (tb[IFLA_IFNAME] &&
371 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ) >= IFNAMSIZ)
372 return -EINVAL;
373
374 err = -EINVAL;
375 ifm = nlmsg_data(nlh);
376 if (ifm->ifi_index >= 0)
377 dev = dev_get_by_index(ifm->ifi_index);
378 else if (tb[IFLA_IFNAME])
379 dev = dev_get_by_name(ifname);
380 else
381 goto errout;
382
383 if (dev == NULL) {
384 err = -ENODEV;
385 goto errout;
386 }
387
388 if (tb[IFLA_ADDRESS] &&
389 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
390 goto errout_dev;
391
392 if (tb[IFLA_BROADCAST] &&
393 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
394 goto errout_dev;
395
396 if (tb[IFLA_MAP]) {
397 struct rtnl_link_ifmap *u_map;
398 struct ifmap k_map;
399
400 if (!dev->set_config) {
401 err = -EOPNOTSUPP;
402 goto errout_dev;
403 }
404
405 if (!netif_device_present(dev)) {
406 err = -ENODEV;
407 goto errout_dev;
408 }
409
410 u_map = nla_data(tb[IFLA_MAP]);
411 k_map.mem_start = (unsigned long) u_map->mem_start;
412 k_map.mem_end = (unsigned long) u_map->mem_end;
413 k_map.base_addr = (unsigned short) u_map->base_addr;
414 k_map.irq = (unsigned char) u_map->irq;
415 k_map.dma = (unsigned char) u_map->dma;
416 k_map.port = (unsigned char) u_map->port;
417
418 err = dev->set_config(dev, &k_map);
419 if (err < 0)
420 goto errout_dev;
421
422 modified = 1;
423 }
424
425 if (tb[IFLA_ADDRESS]) {
426 struct sockaddr *sa;
427 int len;
428
429 if (!dev->set_mac_address) {
430 err = -EOPNOTSUPP;
431 goto errout_dev;
432 }
433
434 if (!netif_device_present(dev)) {
435 err = -ENODEV;
436 goto errout_dev;
437 }
438
439 len = sizeof(sa_family_t) + dev->addr_len;
440 sa = kmalloc(len, GFP_KERNEL);
441 if (!sa) {
442 err = -ENOMEM;
443 goto errout_dev;
444 }
445 sa->sa_family = dev->type;
446 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
447 dev->addr_len);
448 err = dev->set_mac_address(dev, sa);
449 kfree(sa);
450 if (err)
451 goto errout_dev;
452 send_addr_notify = 1;
453 modified = 1;
454 }
455
456 if (tb[IFLA_MTU]) {
457 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
458 if (err < 0)
459 goto errout_dev;
460 modified = 1;
461 }
462
463 /*
464 * Interface selected by interface index but interface
465 * name provided implies that a name change has been
466 * requested.
467 */
468 if (ifm->ifi_index >= 0 && ifname[0]) {
469 err = dev_change_name(dev, ifname);
470 if (err < 0)
471 goto errout_dev;
472 modified = 1;
473 }
474
475 #ifdef CONFIG_NET_WIRELESS_RTNETLINK
476 if (tb[IFLA_WIRELESS]) {
477 /* Call Wireless Extensions.
478 * Various stuff checked in there... */
479 err = wireless_rtnetlink_set(dev, nla_data(tb[IFLA_WIRELESS]),
480 nla_len(tb[IFLA_WIRELESS]));
481 if (err < 0)
482 goto errout_dev;
483 }
484 #endif /* CONFIG_NET_WIRELESS_RTNETLINK */
485
486 if (tb[IFLA_BROADCAST]) {
487 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
488 send_addr_notify = 1;
489 }
490
491
492 if (ifm->ifi_flags)
493 dev_change_flags(dev, ifm->ifi_flags);
494
495 if (tb[IFLA_TXQLEN])
496 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
497
498 if (tb[IFLA_WEIGHT])
499 dev->weight = nla_get_u32(tb[IFLA_WEIGHT]);
500
501 if (tb[IFLA_OPERSTATE])
502 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
503
504 if (tb[IFLA_LINKMODE]) {
505 write_lock_bh(&dev_base_lock);
506 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
507 write_unlock_bh(&dev_base_lock);
508 }
509
510 err = 0;
511
512 errout_dev:
513 if (err < 0 && modified && net_ratelimit())
514 printk(KERN_WARNING "A link change request failed with "
515 "some changes comitted already. Interface %s may "
516 "have been left with an inconsistent configuration, "
517 "please check.\n", dev->name);
518
519 if (send_addr_notify)
520 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
521
522 dev_put(dev);
523 errout:
524 return err;
525 }
526
527 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
528 {
529 struct ifinfomsg *ifm;
530 struct nlattr *tb[IFLA_MAX+1];
531 struct net_device *dev = NULL;
532 struct sk_buff *nskb;
533 char *iw_buf = NULL, *iw = NULL;
534 int iw_buf_len = 0;
535 int err, payload;
536
537 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
538 if (err < 0)
539 goto errout;
540
541 ifm = nlmsg_data(nlh);
542 if (ifm->ifi_index >= 0) {
543 dev = dev_get_by_index(ifm->ifi_index);
544 if (dev == NULL)
545 return -ENODEV;
546 } else
547 return -EINVAL;
548
549
550 #ifdef CONFIG_NET_WIRELESS_RTNETLINK
551 if (tb[IFLA_WIRELESS]) {
552 /* Call Wireless Extensions. We need to know the size before
553 * we can alloc. Various stuff checked in there... */
554 err = wireless_rtnetlink_get(dev, nla_data(tb[IFLA_WIRELESS]),
555 nla_len(tb[IFLA_WIRELESS]),
556 &iw_buf, &iw_buf_len);
557 if (err < 0)
558 goto errout;
559
560 iw += IW_EV_POINT_OFF;
561 }
562 #endif /* CONFIG_NET_WIRELESS_RTNETLINK */
563
564 payload = NLMSG_ALIGN(sizeof(struct ifinfomsg) +
565 nla_total_size(iw_buf_len));
566 nskb = nlmsg_new(nlmsg_total_size(payload), GFP_KERNEL);
567 if (nskb == NULL) {
568 err = -ENOBUFS;
569 goto errout;
570 }
571
572 err = rtnl_fill_ifinfo(nskb, dev, iw, iw_buf_len, RTM_NEWLINK,
573 NETLINK_CB(skb).pid, nlh->nlmsg_seq, 0, 0);
574 if (err <= 0) {
575 kfree_skb(skb);
576 goto errout;
577 }
578
579 err = netlink_unicast(rtnl, skb, NETLINK_CB(skb).pid, MSG_DONTWAIT);
580 if (err > 0)
581 err = 0;
582 errout:
583 kfree(iw_buf);
584 dev_put(dev);
585
586 return err;
587 }
588
589 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
590 {
591 int idx;
592 int s_idx = cb->family;
593
594 if (s_idx == 0)
595 s_idx = 1;
596 for (idx=1; idx<NPROTO; idx++) {
597 int type = cb->nlh->nlmsg_type-RTM_BASE;
598 if (idx < s_idx || idx == PF_PACKET)
599 continue;
600 if (rtnetlink_links[idx] == NULL ||
601 rtnetlink_links[idx][type].dumpit == NULL)
602 continue;
603 if (idx > s_idx)
604 memset(&cb->args[0], 0, sizeof(cb->args));
605 if (rtnetlink_links[idx][type].dumpit(skb, cb))
606 break;
607 }
608 cb->family = idx;
609
610 return skb->len;
611 }
612
613 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change)
614 {
615 struct sk_buff *skb;
616 int size = NLMSG_SPACE(sizeof(struct ifinfomsg) +
617 sizeof(struct rtnl_link_ifmap) +
618 sizeof(struct rtnl_link_stats) + 128);
619
620 skb = nlmsg_new(size, GFP_KERNEL);
621 if (!skb)
622 return;
623
624 if (rtnl_fill_ifinfo(skb, dev, NULL, 0, type, 0, 0, change, 0) < 0) {
625 kfree_skb(skb);
626 return;
627 }
628 NETLINK_CB(skb).dst_group = RTNLGRP_LINK;
629 netlink_broadcast(rtnl, skb, 0, RTNLGRP_LINK, GFP_KERNEL);
630 }
631
632 /* Protected by RTNL sempahore. */
633 static struct rtattr **rta_buf;
634 static int rtattr_max;
635
636 /* Process one rtnetlink message. */
637
638 static __inline__ int
639 rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, int *errp)
640 {
641 struct rtnetlink_link *link;
642 struct rtnetlink_link *link_tab;
643 int sz_idx, kind;
644 int min_len;
645 int family;
646 int type;
647 int err;
648
649 /* Only requests are handled by kernel now */
650 if (!(nlh->nlmsg_flags&NLM_F_REQUEST))
651 return 0;
652
653 type = nlh->nlmsg_type;
654
655 /* A control message: ignore them */
656 if (type < RTM_BASE)
657 return 0;
658
659 /* Unknown message: reply with EINVAL */
660 if (type > RTM_MAX)
661 goto err_inval;
662
663 type -= RTM_BASE;
664
665 /* All the messages must have at least 1 byte length */
666 if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg)))
667 return 0;
668
669 family = ((struct rtgenmsg*)NLMSG_DATA(nlh))->rtgen_family;
670 if (family >= NPROTO) {
671 *errp = -EAFNOSUPPORT;
672 return -1;
673 }
674
675 link_tab = rtnetlink_links[family];
676 if (link_tab == NULL)
677 link_tab = rtnetlink_links[PF_UNSPEC];
678 link = &link_tab[type];
679
680 sz_idx = type>>2;
681 kind = type&3;
682
683 if (kind != 2 && security_netlink_recv(skb, CAP_NET_ADMIN)) {
684 *errp = -EPERM;
685 return -1;
686 }
687
688 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
689 if (link->dumpit == NULL)
690 link = &(rtnetlink_links[PF_UNSPEC][type]);
691
692 if (link->dumpit == NULL)
693 goto err_inval;
694
695 if ((*errp = netlink_dump_start(rtnl, skb, nlh,
696 link->dumpit, NULL)) != 0) {
697 return -1;
698 }
699
700 netlink_queue_skip(nlh, skb);
701 return -1;
702 }
703
704 memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *)));
705
706 min_len = rtm_min[sz_idx];
707 if (nlh->nlmsg_len < min_len)
708 goto err_inval;
709
710 if (nlh->nlmsg_len > min_len) {
711 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
712 struct rtattr *attr = (void*)nlh + NLMSG_ALIGN(min_len);
713
714 while (RTA_OK(attr, attrlen)) {
715 unsigned flavor = attr->rta_type;
716 if (flavor) {
717 if (flavor > rta_max[sz_idx])
718 goto err_inval;
719 rta_buf[flavor-1] = attr;
720 }
721 attr = RTA_NEXT(attr, attrlen);
722 }
723 }
724
725 if (link->doit == NULL)
726 link = &(rtnetlink_links[PF_UNSPEC][type]);
727 if (link->doit == NULL)
728 goto err_inval;
729 err = link->doit(skb, nlh, (void *)&rta_buf[0]);
730
731 *errp = err;
732 return err;
733
734 err_inval:
735 *errp = -EINVAL;
736 return -1;
737 }
738
739 static void rtnetlink_rcv(struct sock *sk, int len)
740 {
741 unsigned int qlen = 0;
742
743 do {
744 mutex_lock(&rtnl_mutex);
745 netlink_run_queue(sk, &qlen, &rtnetlink_rcv_msg);
746 mutex_unlock(&rtnl_mutex);
747
748 netdev_run_todo();
749 } while (qlen);
750 }
751
752 static struct rtnetlink_link link_rtnetlink_table[RTM_NR_MSGTYPES] =
753 {
754 [RTM_GETLINK - RTM_BASE] = { .doit = rtnl_getlink,
755 .dumpit = rtnl_dump_ifinfo },
756 [RTM_SETLINK - RTM_BASE] = { .doit = rtnl_setlink },
757 [RTM_GETADDR - RTM_BASE] = { .dumpit = rtnl_dump_all },
758 [RTM_GETROUTE - RTM_BASE] = { .dumpit = rtnl_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 = rtnl_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