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[mirror_ubuntu-artful-kernel.git] / net / core / rtnetlink.c
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 static struct sock *rtnl;
62
63 void rtnl_lock(void)
64 {
65 mutex_lock(&rtnl_mutex);
66 }
67
68 void __rtnl_unlock(void)
69 {
70 mutex_unlock(&rtnl_mutex);
71 }
72
73 void rtnl_unlock(void)
74 {
75 mutex_unlock(&rtnl_mutex);
76 if (rtnl && rtnl->sk_receive_queue.qlen)
77 rtnl->sk_data_ready(rtnl, 0);
78 netdev_run_todo();
79 }
80
81 int rtnl_trylock(void)
82 {
83 return mutex_trylock(&rtnl_mutex);
84 }
85
86 int rtattr_parse(struct rtattr *tb[], int maxattr, struct rtattr *rta, int len)
87 {
88 memset(tb, 0, sizeof(struct rtattr*)*maxattr);
89
90 while (RTA_OK(rta, len)) {
91 unsigned flavor = rta->rta_type;
92 if (flavor && flavor <= maxattr)
93 tb[flavor-1] = rta;
94 rta = RTA_NEXT(rta, len);
95 }
96 return 0;
97 }
98
99 struct rtnetlink_link * rtnetlink_links[NPROTO];
100
101 static const int rtm_min[RTM_NR_FAMILIES] =
102 {
103 [RTM_FAM(RTM_NEWLINK)] = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
104 [RTM_FAM(RTM_NEWADDR)] = NLMSG_LENGTH(sizeof(struct ifaddrmsg)),
105 [RTM_FAM(RTM_NEWROUTE)] = NLMSG_LENGTH(sizeof(struct rtmsg)),
106 [RTM_FAM(RTM_NEWRULE)] = NLMSG_LENGTH(sizeof(struct fib_rule_hdr)),
107 [RTM_FAM(RTM_NEWQDISC)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
108 [RTM_FAM(RTM_NEWTCLASS)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
109 [RTM_FAM(RTM_NEWTFILTER)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
110 [RTM_FAM(RTM_NEWACTION)] = NLMSG_LENGTH(sizeof(struct tcamsg)),
111 [RTM_FAM(RTM_NEWPREFIX)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
112 [RTM_FAM(RTM_GETMULTICAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
113 [RTM_FAM(RTM_GETANYCAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
114 };
115
116 static const int rta_max[RTM_NR_FAMILIES] =
117 {
118 [RTM_FAM(RTM_NEWLINK)] = IFLA_MAX,
119 [RTM_FAM(RTM_NEWADDR)] = IFA_MAX,
120 [RTM_FAM(RTM_NEWROUTE)] = RTA_MAX,
121 [RTM_FAM(RTM_NEWRULE)] = FRA_MAX,
122 [RTM_FAM(RTM_NEWQDISC)] = TCA_MAX,
123 [RTM_FAM(RTM_NEWTCLASS)] = TCA_MAX,
124 [RTM_FAM(RTM_NEWTFILTER)] = TCA_MAX,
125 [RTM_FAM(RTM_NEWACTION)] = TCAA_MAX,
126 };
127
128 void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const void *data)
129 {
130 struct rtattr *rta;
131 int size = RTA_LENGTH(attrlen);
132
133 rta = (struct rtattr*)skb_put(skb, RTA_ALIGN(size));
134 rta->rta_type = attrtype;
135 rta->rta_len = size;
136 memcpy(RTA_DATA(rta), data, attrlen);
137 memset(RTA_DATA(rta) + attrlen, 0, RTA_ALIGN(size) - size);
138 }
139
140 size_t rtattr_strlcpy(char *dest, const struct rtattr *rta, size_t size)
141 {
142 size_t ret = RTA_PAYLOAD(rta);
143 char *src = RTA_DATA(rta);
144
145 if (ret > 0 && src[ret - 1] == '\0')
146 ret--;
147 if (size > 0) {
148 size_t len = (ret >= size) ? size - 1 : ret;
149 memset(dest, 0, size);
150 memcpy(dest, src, len);
151 }
152 return ret;
153 }
154
155 int rtnetlink_send(struct sk_buff *skb, u32 pid, unsigned group, int echo)
156 {
157 int err = 0;
158
159 NETLINK_CB(skb).dst_group = group;
160 if (echo)
161 atomic_inc(&skb->users);
162 netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL);
163 if (echo)
164 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
165 return err;
166 }
167
168 int rtnl_unicast(struct sk_buff *skb, u32 pid)
169 {
170 return nlmsg_unicast(rtnl, skb, pid);
171 }
172
173 int rtnl_notify(struct sk_buff *skb, u32 pid, u32 group,
174 struct nlmsghdr *nlh, gfp_t flags)
175 {
176 int report = 0;
177
178 if (nlh)
179 report = nlmsg_report(nlh);
180
181 return nlmsg_notify(rtnl, skb, pid, group, report, flags);
182 }
183
184 void rtnl_set_sk_err(u32 group, int error)
185 {
186 netlink_set_err(rtnl, 0, group, error);
187 }
188
189 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics)
190 {
191 struct nlattr *mx;
192 int i, valid = 0;
193
194 mx = nla_nest_start(skb, RTA_METRICS);
195 if (mx == NULL)
196 return -ENOBUFS;
197
198 for (i = 0; i < RTAX_MAX; i++) {
199 if (metrics[i]) {
200 valid++;
201 NLA_PUT_U32(skb, i+1, metrics[i]);
202 }
203 }
204
205 if (!valid) {
206 nla_nest_cancel(skb, mx);
207 return 0;
208 }
209
210 return nla_nest_end(skb, mx);
211
212 nla_put_failure:
213 return nla_nest_cancel(skb, mx);
214 }
215
216
217 static void set_operstate(struct net_device *dev, unsigned char transition)
218 {
219 unsigned char operstate = dev->operstate;
220
221 switch(transition) {
222 case IF_OPER_UP:
223 if ((operstate == IF_OPER_DORMANT ||
224 operstate == IF_OPER_UNKNOWN) &&
225 !netif_dormant(dev))
226 operstate = IF_OPER_UP;
227 break;
228
229 case IF_OPER_DORMANT:
230 if (operstate == IF_OPER_UP ||
231 operstate == IF_OPER_UNKNOWN)
232 operstate = IF_OPER_DORMANT;
233 break;
234 };
235
236 if (dev->operstate != operstate) {
237 write_lock_bh(&dev_base_lock);
238 dev->operstate = operstate;
239 write_unlock_bh(&dev_base_lock);
240 netdev_state_change(dev);
241 }
242 }
243
244 static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
245 struct net_device_stats *b)
246 {
247 a->rx_packets = b->rx_packets;
248 a->tx_packets = b->tx_packets;
249 a->rx_bytes = b->rx_bytes;
250 a->tx_bytes = b->tx_bytes;
251 a->rx_errors = b->rx_errors;
252 a->tx_errors = b->tx_errors;
253 a->rx_dropped = b->rx_dropped;
254 a->tx_dropped = b->tx_dropped;
255
256 a->multicast = b->multicast;
257 a->collisions = b->collisions;
258
259 a->rx_length_errors = b->rx_length_errors;
260 a->rx_over_errors = b->rx_over_errors;
261 a->rx_crc_errors = b->rx_crc_errors;
262 a->rx_frame_errors = b->rx_frame_errors;
263 a->rx_fifo_errors = b->rx_fifo_errors;
264 a->rx_missed_errors = b->rx_missed_errors;
265
266 a->tx_aborted_errors = b->tx_aborted_errors;
267 a->tx_carrier_errors = b->tx_carrier_errors;
268 a->tx_fifo_errors = b->tx_fifo_errors;
269 a->tx_heartbeat_errors = b->tx_heartbeat_errors;
270 a->tx_window_errors = b->tx_window_errors;
271
272 a->rx_compressed = b->rx_compressed;
273 a->tx_compressed = b->tx_compressed;
274 };
275
276 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
277 void *iwbuf, int iwbuflen, int type, u32 pid,
278 u32 seq, u32 change, unsigned int flags)
279 {
280 struct ifinfomsg *ifm;
281 struct nlmsghdr *nlh;
282
283 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
284 if (nlh == NULL)
285 return -ENOBUFS;
286
287 ifm = nlmsg_data(nlh);
288 ifm->ifi_family = AF_UNSPEC;
289 ifm->__ifi_pad = 0;
290 ifm->ifi_type = dev->type;
291 ifm->ifi_index = dev->ifindex;
292 ifm->ifi_flags = dev_get_flags(dev);
293 ifm->ifi_change = change;
294
295 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
296 NLA_PUT_U32(skb, IFLA_TXQLEN, dev->tx_queue_len);
297 NLA_PUT_U32(skb, IFLA_WEIGHT, dev->weight);
298 NLA_PUT_U8(skb, IFLA_OPERSTATE,
299 netif_running(dev) ? dev->operstate : IF_OPER_DOWN);
300 NLA_PUT_U8(skb, IFLA_LINKMODE, dev->link_mode);
301 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
302
303 if (dev->ifindex != dev->iflink)
304 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
305
306 if (dev->master)
307 NLA_PUT_U32(skb, IFLA_MASTER, dev->master->ifindex);
308
309 if (dev->qdisc_sleeping)
310 NLA_PUT_STRING(skb, IFLA_QDISC, dev->qdisc_sleeping->ops->id);
311
312 if (1) {
313 struct rtnl_link_ifmap map = {
314 .mem_start = dev->mem_start,
315 .mem_end = dev->mem_end,
316 .base_addr = dev->base_addr,
317 .irq = dev->irq,
318 .dma = dev->dma,
319 .port = dev->if_port,
320 };
321 NLA_PUT(skb, IFLA_MAP, sizeof(map), &map);
322 }
323
324 if (dev->addr_len) {
325 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
326 NLA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast);
327 }
328
329 if (dev->get_stats) {
330 struct net_device_stats *stats = dev->get_stats(dev);
331 if (stats) {
332 struct nlattr *attr;
333
334 attr = nla_reserve(skb, IFLA_STATS,
335 sizeof(struct rtnl_link_stats));
336 if (attr == NULL)
337 goto nla_put_failure;
338
339 copy_rtnl_link_stats(nla_data(attr), stats);
340 }
341 }
342
343 if (iwbuf)
344 NLA_PUT(skb, IFLA_WIRELESS, iwbuflen, iwbuf);
345
346 return nlmsg_end(skb, nlh);
347
348 nla_put_failure:
349 return nlmsg_cancel(skb, nlh);
350 }
351
352 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
353 {
354 int idx;
355 int s_idx = cb->args[0];
356 struct net_device *dev;
357
358 read_lock(&dev_base_lock);
359 for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) {
360 if (idx < s_idx)
361 continue;
362 if (rtnl_fill_ifinfo(skb, dev, NULL, 0, RTM_NEWLINK,
363 NETLINK_CB(cb->skb).pid,
364 cb->nlh->nlmsg_seq, 0, NLM_F_MULTI) <= 0)
365 break;
366 }
367 read_unlock(&dev_base_lock);
368 cb->args[0] = idx;
369
370 return skb->len;
371 }
372
373 static struct nla_policy ifla_policy[IFLA_MAX+1] __read_mostly = {
374 [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 },
375 [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) },
376 [IFLA_MTU] = { .type = NLA_U32 },
377 [IFLA_TXQLEN] = { .type = NLA_U32 },
378 [IFLA_WEIGHT] = { .type = NLA_U32 },
379 [IFLA_OPERSTATE] = { .type = NLA_U8 },
380 [IFLA_LINKMODE] = { .type = NLA_U8 },
381 };
382
383 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
384 {
385 struct ifinfomsg *ifm;
386 struct net_device *dev;
387 int err, send_addr_notify = 0, modified = 0;
388 struct nlattr *tb[IFLA_MAX+1];
389 char ifname[IFNAMSIZ];
390
391 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
392 if (err < 0)
393 goto errout;
394
395 if (tb[IFLA_IFNAME])
396 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
397 else
398 ifname[0] = '\0';
399
400 err = -EINVAL;
401 ifm = nlmsg_data(nlh);
402 if (ifm->ifi_index >= 0)
403 dev = dev_get_by_index(ifm->ifi_index);
404 else if (tb[IFLA_IFNAME])
405 dev = dev_get_by_name(ifname);
406 else
407 goto errout;
408
409 if (dev == NULL) {
410 err = -ENODEV;
411 goto errout;
412 }
413
414 if (tb[IFLA_ADDRESS] &&
415 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
416 goto errout_dev;
417
418 if (tb[IFLA_BROADCAST] &&
419 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
420 goto errout_dev;
421
422 if (tb[IFLA_MAP]) {
423 struct rtnl_link_ifmap *u_map;
424 struct ifmap k_map;
425
426 if (!dev->set_config) {
427 err = -EOPNOTSUPP;
428 goto errout_dev;
429 }
430
431 if (!netif_device_present(dev)) {
432 err = -ENODEV;
433 goto errout_dev;
434 }
435
436 u_map = nla_data(tb[IFLA_MAP]);
437 k_map.mem_start = (unsigned long) u_map->mem_start;
438 k_map.mem_end = (unsigned long) u_map->mem_end;
439 k_map.base_addr = (unsigned short) u_map->base_addr;
440 k_map.irq = (unsigned char) u_map->irq;
441 k_map.dma = (unsigned char) u_map->dma;
442 k_map.port = (unsigned char) u_map->port;
443
444 err = dev->set_config(dev, &k_map);
445 if (err < 0)
446 goto errout_dev;
447
448 modified = 1;
449 }
450
451 if (tb[IFLA_ADDRESS]) {
452 struct sockaddr *sa;
453 int len;
454
455 if (!dev->set_mac_address) {
456 err = -EOPNOTSUPP;
457 goto errout_dev;
458 }
459
460 if (!netif_device_present(dev)) {
461 err = -ENODEV;
462 goto errout_dev;
463 }
464
465 len = sizeof(sa_family_t) + dev->addr_len;
466 sa = kmalloc(len, GFP_KERNEL);
467 if (!sa) {
468 err = -ENOMEM;
469 goto errout_dev;
470 }
471 sa->sa_family = dev->type;
472 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
473 dev->addr_len);
474 err = dev->set_mac_address(dev, sa);
475 kfree(sa);
476 if (err)
477 goto errout_dev;
478 send_addr_notify = 1;
479 modified = 1;
480 }
481
482 if (tb[IFLA_MTU]) {
483 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
484 if (err < 0)
485 goto errout_dev;
486 modified = 1;
487 }
488
489 /*
490 * Interface selected by interface index but interface
491 * name provided implies that a name change has been
492 * requested.
493 */
494 if (ifm->ifi_index >= 0 && ifname[0]) {
495 err = dev_change_name(dev, ifname);
496 if (err < 0)
497 goto errout_dev;
498 modified = 1;
499 }
500
501 #ifdef CONFIG_NET_WIRELESS_RTNETLINK
502 if (tb[IFLA_WIRELESS]) {
503 /* Call Wireless Extensions.
504 * Various stuff checked in there... */
505 err = wireless_rtnetlink_set(dev, nla_data(tb[IFLA_WIRELESS]),
506 nla_len(tb[IFLA_WIRELESS]));
507 if (err < 0)
508 goto errout_dev;
509 }
510 #endif /* CONFIG_NET_WIRELESS_RTNETLINK */
511
512 if (tb[IFLA_BROADCAST]) {
513 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
514 send_addr_notify = 1;
515 }
516
517
518 if (ifm->ifi_flags)
519 dev_change_flags(dev, ifm->ifi_flags);
520
521 if (tb[IFLA_TXQLEN])
522 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
523
524 if (tb[IFLA_WEIGHT])
525 dev->weight = nla_get_u32(tb[IFLA_WEIGHT]);
526
527 if (tb[IFLA_OPERSTATE])
528 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
529
530 if (tb[IFLA_LINKMODE]) {
531 write_lock_bh(&dev_base_lock);
532 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
533 write_unlock_bh(&dev_base_lock);
534 }
535
536 err = 0;
537
538 errout_dev:
539 if (err < 0 && modified && net_ratelimit())
540 printk(KERN_WARNING "A link change request failed with "
541 "some changes comitted already. Interface %s may "
542 "have been left with an inconsistent configuration, "
543 "please check.\n", dev->name);
544
545 if (send_addr_notify)
546 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
547
548 dev_put(dev);
549 errout:
550 return err;
551 }
552
553 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
554 {
555 struct ifinfomsg *ifm;
556 struct nlattr *tb[IFLA_MAX+1];
557 struct net_device *dev = NULL;
558 struct sk_buff *nskb;
559 char *iw_buf = NULL, *iw = NULL;
560 int iw_buf_len = 0;
561 int err, payload;
562
563 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
564 if (err < 0)
565 return err;
566
567 ifm = nlmsg_data(nlh);
568 if (ifm->ifi_index >= 0) {
569 dev = dev_get_by_index(ifm->ifi_index);
570 if (dev == NULL)
571 return -ENODEV;
572 } else
573 return -EINVAL;
574
575
576 #ifdef CONFIG_NET_WIRELESS_RTNETLINK
577 if (tb[IFLA_WIRELESS]) {
578 /* Call Wireless Extensions. We need to know the size before
579 * we can alloc. Various stuff checked in there... */
580 err = wireless_rtnetlink_get(dev, nla_data(tb[IFLA_WIRELESS]),
581 nla_len(tb[IFLA_WIRELESS]),
582 &iw_buf, &iw_buf_len);
583 if (err < 0)
584 goto errout;
585
586 iw += IW_EV_POINT_OFF;
587 }
588 #endif /* CONFIG_NET_WIRELESS_RTNETLINK */
589
590 payload = NLMSG_ALIGN(sizeof(struct ifinfomsg) +
591 nla_total_size(iw_buf_len));
592 nskb = nlmsg_new(nlmsg_total_size(payload), GFP_KERNEL);
593 if (nskb == NULL) {
594 err = -ENOBUFS;
595 goto errout;
596 }
597
598 err = rtnl_fill_ifinfo(nskb, dev, iw, iw_buf_len, RTM_NEWLINK,
599 NETLINK_CB(skb).pid, nlh->nlmsg_seq, 0, 0);
600 if (err <= 0) {
601 kfree_skb(nskb);
602 goto errout;
603 }
604
605 err = rtnl_unicast(skb, NETLINK_CB(skb).pid);
606 errout:
607 kfree(iw_buf);
608 dev_put(dev);
609
610 return err;
611 }
612
613 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
614 {
615 int idx;
616 int s_idx = cb->family;
617
618 if (s_idx == 0)
619 s_idx = 1;
620 for (idx=1; idx<NPROTO; idx++) {
621 int type = cb->nlh->nlmsg_type-RTM_BASE;
622 if (idx < s_idx || idx == PF_PACKET)
623 continue;
624 if (rtnetlink_links[idx] == NULL ||
625 rtnetlink_links[idx][type].dumpit == NULL)
626 continue;
627 if (idx > s_idx)
628 memset(&cb->args[0], 0, sizeof(cb->args));
629 if (rtnetlink_links[idx][type].dumpit(skb, cb))
630 break;
631 }
632 cb->family = idx;
633
634 return skb->len;
635 }
636
637 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change)
638 {
639 struct sk_buff *skb;
640 int err = -ENOBUFS;
641
642 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
643 if (skb == NULL)
644 goto errout;
645
646 err = rtnl_fill_ifinfo(skb, dev, NULL, 0, type, 0, 0, change, 0);
647 if (err < 0) {
648 kfree_skb(skb);
649 goto errout;
650 }
651
652 err = rtnl_notify(skb, 0, RTNLGRP_LINK, NULL, GFP_KERNEL);
653 errout:
654 if (err < 0)
655 rtnl_set_sk_err(RTNLGRP_LINK, err);
656 }
657
658 /* Protected by RTNL sempahore. */
659 static struct rtattr **rta_buf;
660 static int rtattr_max;
661
662 /* Process one rtnetlink message. */
663
664 static __inline__ int
665 rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, int *errp)
666 {
667 struct rtnetlink_link *link;
668 struct rtnetlink_link *link_tab;
669 int sz_idx, kind;
670 int min_len;
671 int family;
672 int type;
673 int err;
674
675 /* Only requests are handled by kernel now */
676 if (!(nlh->nlmsg_flags&NLM_F_REQUEST))
677 return 0;
678
679 type = nlh->nlmsg_type;
680
681 /* A control message: ignore them */
682 if (type < RTM_BASE)
683 return 0;
684
685 /* Unknown message: reply with EINVAL */
686 if (type > RTM_MAX)
687 goto err_inval;
688
689 type -= RTM_BASE;
690
691 /* All the messages must have at least 1 byte length */
692 if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg)))
693 return 0;
694
695 family = ((struct rtgenmsg*)NLMSG_DATA(nlh))->rtgen_family;
696 if (family >= NPROTO) {
697 *errp = -EAFNOSUPPORT;
698 return -1;
699 }
700
701 link_tab = rtnetlink_links[family];
702 if (link_tab == NULL)
703 link_tab = rtnetlink_links[PF_UNSPEC];
704 link = &link_tab[type];
705
706 sz_idx = type>>2;
707 kind = type&3;
708
709 if (kind != 2 && security_netlink_recv(skb, CAP_NET_ADMIN)) {
710 *errp = -EPERM;
711 return -1;
712 }
713
714 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
715 if (link->dumpit == NULL)
716 link = &(rtnetlink_links[PF_UNSPEC][type]);
717
718 if (link->dumpit == NULL)
719 goto err_inval;
720
721 if ((*errp = netlink_dump_start(rtnl, skb, nlh,
722 link->dumpit, NULL)) != 0) {
723 return -1;
724 }
725
726 netlink_queue_skip(nlh, skb);
727 return -1;
728 }
729
730 memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *)));
731
732 min_len = rtm_min[sz_idx];
733 if (nlh->nlmsg_len < min_len)
734 goto err_inval;
735
736 if (nlh->nlmsg_len > min_len) {
737 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
738 struct rtattr *attr = (void*)nlh + NLMSG_ALIGN(min_len);
739
740 while (RTA_OK(attr, attrlen)) {
741 unsigned flavor = attr->rta_type;
742 if (flavor) {
743 if (flavor > rta_max[sz_idx])
744 goto err_inval;
745 rta_buf[flavor-1] = attr;
746 }
747 attr = RTA_NEXT(attr, attrlen);
748 }
749 }
750
751 if (link->doit == NULL)
752 link = &(rtnetlink_links[PF_UNSPEC][type]);
753 if (link->doit == NULL)
754 goto err_inval;
755 err = link->doit(skb, nlh, (void *)&rta_buf[0]);
756
757 *errp = err;
758 return err;
759
760 err_inval:
761 *errp = -EINVAL;
762 return -1;
763 }
764
765 static void rtnetlink_rcv(struct sock *sk, int len)
766 {
767 unsigned int qlen = 0;
768
769 do {
770 mutex_lock(&rtnl_mutex);
771 netlink_run_queue(sk, &qlen, &rtnetlink_rcv_msg);
772 mutex_unlock(&rtnl_mutex);
773
774 netdev_run_todo();
775 } while (qlen);
776 }
777
778 static struct rtnetlink_link link_rtnetlink_table[RTM_NR_MSGTYPES] =
779 {
780 [RTM_GETLINK - RTM_BASE] = { .doit = rtnl_getlink,
781 .dumpit = rtnl_dump_ifinfo },
782 [RTM_SETLINK - RTM_BASE] = { .doit = rtnl_setlink },
783 [RTM_GETADDR - RTM_BASE] = { .dumpit = rtnl_dump_all },
784 [RTM_GETROUTE - RTM_BASE] = { .dumpit = rtnl_dump_all },
785 [RTM_NEWNEIGH - RTM_BASE] = { .doit = neigh_add },
786 [RTM_DELNEIGH - RTM_BASE] = { .doit = neigh_delete },
787 [RTM_GETNEIGH - RTM_BASE] = { .dumpit = neigh_dump_info },
788 #ifdef CONFIG_FIB_RULES
789 [RTM_NEWRULE - RTM_BASE] = { .doit = fib_nl_newrule },
790 [RTM_DELRULE - RTM_BASE] = { .doit = fib_nl_delrule },
791 #endif
792 [RTM_GETRULE - RTM_BASE] = { .dumpit = rtnl_dump_all },
793 [RTM_GETNEIGHTBL - RTM_BASE] = { .dumpit = neightbl_dump_info },
794 [RTM_SETNEIGHTBL - RTM_BASE] = { .doit = neightbl_set },
795 };
796
797 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
798 {
799 struct net_device *dev = ptr;
800 switch (event) {
801 case NETDEV_UNREGISTER:
802 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);
803 break;
804 case NETDEV_REGISTER:
805 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
806 break;
807 case NETDEV_UP:
808 case NETDEV_DOWN:
809 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
810 break;
811 case NETDEV_CHANGE:
812 case NETDEV_GOING_DOWN:
813 break;
814 default:
815 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
816 break;
817 }
818 return NOTIFY_DONE;
819 }
820
821 static struct notifier_block rtnetlink_dev_notifier = {
822 .notifier_call = rtnetlink_event,
823 };
824
825 void __init rtnetlink_init(void)
826 {
827 int i;
828
829 rtattr_max = 0;
830 for (i = 0; i < ARRAY_SIZE(rta_max); i++)
831 if (rta_max[i] > rtattr_max)
832 rtattr_max = rta_max[i];
833 rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL);
834 if (!rta_buf)
835 panic("rtnetlink_init: cannot allocate rta_buf\n");
836
837 rtnl = netlink_kernel_create(NETLINK_ROUTE, RTNLGRP_MAX, rtnetlink_rcv,
838 THIS_MODULE);
839 if (rtnl == NULL)
840 panic("rtnetlink_init: cannot initialize rtnetlink\n");
841 netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV);
842 register_netdevice_notifier(&rtnetlink_dev_notifier);
843 rtnetlink_links[PF_UNSPEC] = link_rtnetlink_table;
844 rtnetlink_links[PF_PACKET] = link_rtnetlink_table;
845 }
846
847 EXPORT_SYMBOL(__rta_fill);
848 EXPORT_SYMBOL(rtattr_strlcpy);
849 EXPORT_SYMBOL(rtattr_parse);
850 EXPORT_SYMBOL(rtnetlink_links);
851 EXPORT_SYMBOL(rtnetlink_put_metrics);
852 EXPORT_SYMBOL(rtnl_lock);
853 EXPORT_SYMBOL(rtnl_trylock);
854 EXPORT_SYMBOL(rtnl_unlock);
855 EXPORT_SYMBOL(rtnl_unicast);
856 EXPORT_SYMBOL(rtnl_notify);
857 EXPORT_SYMBOL(rtnl_set_sk_err);
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