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8f225499e32e12cb654b2904245877d12adbc9a2
[deliverable/linux.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 },
375 [IFLA_MAP] = { .minlen = 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) >= IFNAMSIZ)
397 return -EINVAL;
398
399 err = -EINVAL;
400 ifm = nlmsg_data(nlh);
401 if (ifm->ifi_index >= 0)
402 dev = dev_get_by_index(ifm->ifi_index);
403 else if (tb[IFLA_IFNAME])
404 dev = dev_get_by_name(ifname);
405 else
406 goto errout;
407
408 if (dev == NULL) {
409 err = -ENODEV;
410 goto errout;
411 }
412
413 if (tb[IFLA_ADDRESS] &&
414 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
415 goto errout_dev;
416
417 if (tb[IFLA_BROADCAST] &&
418 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
419 goto errout_dev;
420
421 if (tb[IFLA_MAP]) {
422 struct rtnl_link_ifmap *u_map;
423 struct ifmap k_map;
424
425 if (!dev->set_config) {
426 err = -EOPNOTSUPP;
427 goto errout_dev;
428 }
429
430 if (!netif_device_present(dev)) {
431 err = -ENODEV;
432 goto errout_dev;
433 }
434
435 u_map = nla_data(tb[IFLA_MAP]);
436 k_map.mem_start = (unsigned long) u_map->mem_start;
437 k_map.mem_end = (unsigned long) u_map->mem_end;
438 k_map.base_addr = (unsigned short) u_map->base_addr;
439 k_map.irq = (unsigned char) u_map->irq;
440 k_map.dma = (unsigned char) u_map->dma;
441 k_map.port = (unsigned char) u_map->port;
442
443 err = dev->set_config(dev, &k_map);
444 if (err < 0)
445 goto errout_dev;
446
447 modified = 1;
448 }
449
450 if (tb[IFLA_ADDRESS]) {
451 struct sockaddr *sa;
452 int len;
453
454 if (!dev->set_mac_address) {
455 err = -EOPNOTSUPP;
456 goto errout_dev;
457 }
458
459 if (!netif_device_present(dev)) {
460 err = -ENODEV;
461 goto errout_dev;
462 }
463
464 len = sizeof(sa_family_t) + dev->addr_len;
465 sa = kmalloc(len, GFP_KERNEL);
466 if (!sa) {
467 err = -ENOMEM;
468 goto errout_dev;
469 }
470 sa->sa_family = dev->type;
471 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
472 dev->addr_len);
473 err = dev->set_mac_address(dev, sa);
474 kfree(sa);
475 if (err)
476 goto errout_dev;
477 send_addr_notify = 1;
478 modified = 1;
479 }
480
481 if (tb[IFLA_MTU]) {
482 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
483 if (err < 0)
484 goto errout_dev;
485 modified = 1;
486 }
487
488 /*
489 * Interface selected by interface index but interface
490 * name provided implies that a name change has been
491 * requested.
492 */
493 if (ifm->ifi_index >= 0 && ifname[0]) {
494 err = dev_change_name(dev, ifname);
495 if (err < 0)
496 goto errout_dev;
497 modified = 1;
498 }
499
500 #ifdef CONFIG_NET_WIRELESS_RTNETLINK
501 if (tb[IFLA_WIRELESS]) {
502 /* Call Wireless Extensions.
503 * Various stuff checked in there... */
504 err = wireless_rtnetlink_set(dev, nla_data(tb[IFLA_WIRELESS]),
505 nla_len(tb[IFLA_WIRELESS]));
506 if (err < 0)
507 goto errout_dev;
508 }
509 #endif /* CONFIG_NET_WIRELESS_RTNETLINK */
510
511 if (tb[IFLA_BROADCAST]) {
512 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
513 send_addr_notify = 1;
514 }
515
516
517 if (ifm->ifi_flags)
518 dev_change_flags(dev, ifm->ifi_flags);
519
520 if (tb[IFLA_TXQLEN])
521 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
522
523 if (tb[IFLA_WEIGHT])
524 dev->weight = nla_get_u32(tb[IFLA_WEIGHT]);
525
526 if (tb[IFLA_OPERSTATE])
527 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
528
529 if (tb[IFLA_LINKMODE]) {
530 write_lock_bh(&dev_base_lock);
531 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
532 write_unlock_bh(&dev_base_lock);
533 }
534
535 err = 0;
536
537 errout_dev:
538 if (err < 0 && modified && net_ratelimit())
539 printk(KERN_WARNING "A link change request failed with "
540 "some changes comitted already. Interface %s may "
541 "have been left with an inconsistent configuration, "
542 "please check.\n", dev->name);
543
544 if (send_addr_notify)
545 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
546
547 dev_put(dev);
548 errout:
549 return err;
550 }
551
552 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
553 {
554 struct ifinfomsg *ifm;
555 struct nlattr *tb[IFLA_MAX+1];
556 struct net_device *dev = NULL;
557 struct sk_buff *nskb;
558 char *iw_buf = NULL, *iw = NULL;
559 int iw_buf_len = 0;
560 int err, payload;
561
562 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
563 if (err < 0)
564 goto errout;
565
566 ifm = nlmsg_data(nlh);
567 if (ifm->ifi_index >= 0) {
568 dev = dev_get_by_index(ifm->ifi_index);
569 if (dev == NULL)
570 return -ENODEV;
571 } else
572 return -EINVAL;
573
574
575 #ifdef CONFIG_NET_WIRELESS_RTNETLINK
576 if (tb[IFLA_WIRELESS]) {
577 /* Call Wireless Extensions. We need to know the size before
578 * we can alloc. Various stuff checked in there... */
579 err = wireless_rtnetlink_get(dev, nla_data(tb[IFLA_WIRELESS]),
580 nla_len(tb[IFLA_WIRELESS]),
581 &iw_buf, &iw_buf_len);
582 if (err < 0)
583 goto errout;
584
585 iw += IW_EV_POINT_OFF;
586 }
587 #endif /* CONFIG_NET_WIRELESS_RTNETLINK */
588
589 payload = NLMSG_ALIGN(sizeof(struct ifinfomsg) +
590 nla_total_size(iw_buf_len));
591 nskb = nlmsg_new(nlmsg_total_size(payload), GFP_KERNEL);
592 if (nskb == NULL) {
593 err = -ENOBUFS;
594 goto errout;
595 }
596
597 err = rtnl_fill_ifinfo(nskb, dev, iw, iw_buf_len, RTM_NEWLINK,
598 NETLINK_CB(skb).pid, nlh->nlmsg_seq, 0, 0);
599 if (err <= 0) {
600 kfree_skb(skb);
601 goto errout;
602 }
603
604 err = rtnl_unicast(skb, NETLINK_CB(skb).pid);
605 errout:
606 kfree(iw_buf);
607 dev_put(dev);
608
609 return err;
610 }
611
612 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
613 {
614 int idx;
615 int s_idx = cb->family;
616
617 if (s_idx == 0)
618 s_idx = 1;
619 for (idx=1; idx<NPROTO; idx++) {
620 int type = cb->nlh->nlmsg_type-RTM_BASE;
621 if (idx < s_idx || idx == PF_PACKET)
622 continue;
623 if (rtnetlink_links[idx] == NULL ||
624 rtnetlink_links[idx][type].dumpit == NULL)
625 continue;
626 if (idx > s_idx)
627 memset(&cb->args[0], 0, sizeof(cb->args));
628 if (rtnetlink_links[idx][type].dumpit(skb, cb))
629 break;
630 }
631 cb->family = idx;
632
633 return skb->len;
634 }
635
636 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change)
637 {
638 struct sk_buff *skb;
639 int err = -ENOBUFS;
640
641 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
642 if (skb == NULL)
643 goto errout;
644
645 err = rtnl_fill_ifinfo(skb, dev, NULL, 0, type, 0, 0, change, 0);
646 if (err < 0) {
647 kfree_skb(skb);
648 goto errout;
649 }
650
651 err = rtnl_notify(skb, 0, RTNLGRP_LINK, NULL, GFP_KERNEL);
652 errout:
653 if (err < 0)
654 rtnl_set_sk_err(RTNLGRP_LINK, err);
655 }
656
657 /* Protected by RTNL sempahore. */
658 static struct rtattr **rta_buf;
659 static int rtattr_max;
660
661 /* Process one rtnetlink message. */
662
663 static __inline__ int
664 rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, int *errp)
665 {
666 struct rtnetlink_link *link;
667 struct rtnetlink_link *link_tab;
668 int sz_idx, kind;
669 int min_len;
670 int family;
671 int type;
672 int err;
673
674 /* Only requests are handled by kernel now */
675 if (!(nlh->nlmsg_flags&NLM_F_REQUEST))
676 return 0;
677
678 type = nlh->nlmsg_type;
679
680 /* A control message: ignore them */
681 if (type < RTM_BASE)
682 return 0;
683
684 /* Unknown message: reply with EINVAL */
685 if (type > RTM_MAX)
686 goto err_inval;
687
688 type -= RTM_BASE;
689
690 /* All the messages must have at least 1 byte length */
691 if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg)))
692 return 0;
693
694 family = ((struct rtgenmsg*)NLMSG_DATA(nlh))->rtgen_family;
695 if (family >= NPROTO) {
696 *errp = -EAFNOSUPPORT;
697 return -1;
698 }
699
700 link_tab = rtnetlink_links[family];
701 if (link_tab == NULL)
702 link_tab = rtnetlink_links[PF_UNSPEC];
703 link = &link_tab[type];
704
705 sz_idx = type>>2;
706 kind = type&3;
707
708 if (kind != 2 && security_netlink_recv(skb, CAP_NET_ADMIN)) {
709 *errp = -EPERM;
710 return -1;
711 }
712
713 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
714 if (link->dumpit == NULL)
715 link = &(rtnetlink_links[PF_UNSPEC][type]);
716
717 if (link->dumpit == NULL)
718 goto err_inval;
719
720 if ((*errp = netlink_dump_start(rtnl, skb, nlh,
721 link->dumpit, NULL)) != 0) {
722 return -1;
723 }
724
725 netlink_queue_skip(nlh, skb);
726 return -1;
727 }
728
729 memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *)));
730
731 min_len = rtm_min[sz_idx];
732 if (nlh->nlmsg_len < min_len)
733 goto err_inval;
734
735 if (nlh->nlmsg_len > min_len) {
736 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
737 struct rtattr *attr = (void*)nlh + NLMSG_ALIGN(min_len);
738
739 while (RTA_OK(attr, attrlen)) {
740 unsigned flavor = attr->rta_type;
741 if (flavor) {
742 if (flavor > rta_max[sz_idx])
743 goto err_inval;
744 rta_buf[flavor-1] = attr;
745 }
746 attr = RTA_NEXT(attr, attrlen);
747 }
748 }
749
750 if (link->doit == NULL)
751 link = &(rtnetlink_links[PF_UNSPEC][type]);
752 if (link->doit == NULL)
753 goto err_inval;
754 err = link->doit(skb, nlh, (void *)&rta_buf[0]);
755
756 *errp = err;
757 return err;
758
759 err_inval:
760 *errp = -EINVAL;
761 return -1;
762 }
763
764 static void rtnetlink_rcv(struct sock *sk, int len)
765 {
766 unsigned int qlen = 0;
767
768 do {
769 mutex_lock(&rtnl_mutex);
770 netlink_run_queue(sk, &qlen, &rtnetlink_rcv_msg);
771 mutex_unlock(&rtnl_mutex);
772
773 netdev_run_todo();
774 } while (qlen);
775 }
776
777 static struct rtnetlink_link link_rtnetlink_table[RTM_NR_MSGTYPES] =
778 {
779 [RTM_GETLINK - RTM_BASE] = { .doit = rtnl_getlink,
780 .dumpit = rtnl_dump_ifinfo },
781 [RTM_SETLINK - RTM_BASE] = { .doit = rtnl_setlink },
782 [RTM_GETADDR - RTM_BASE] = { .dumpit = rtnl_dump_all },
783 [RTM_GETROUTE - RTM_BASE] = { .dumpit = rtnl_dump_all },
784 [RTM_NEWNEIGH - RTM_BASE] = { .doit = neigh_add },
785 [RTM_DELNEIGH - RTM_BASE] = { .doit = neigh_delete },
786 [RTM_GETNEIGH - RTM_BASE] = { .dumpit = neigh_dump_info },
787 #ifdef CONFIG_FIB_RULES
788 [RTM_NEWRULE - RTM_BASE] = { .doit = fib_nl_newrule },
789 [RTM_DELRULE - RTM_BASE] = { .doit = fib_nl_delrule },
790 #endif
791 [RTM_GETRULE - RTM_BASE] = { .dumpit = rtnl_dump_all },
792 [RTM_GETNEIGHTBL - RTM_BASE] = { .dumpit = neightbl_dump_info },
793 [RTM_SETNEIGHTBL - RTM_BASE] = { .doit = neightbl_set },
794 };
795
796 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
797 {
798 struct net_device *dev = ptr;
799 switch (event) {
800 case NETDEV_UNREGISTER:
801 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);
802 break;
803 case NETDEV_REGISTER:
804 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
805 break;
806 case NETDEV_UP:
807 case NETDEV_DOWN:
808 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
809 break;
810 case NETDEV_CHANGE:
811 case NETDEV_GOING_DOWN:
812 break;
813 default:
814 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
815 break;
816 }
817 return NOTIFY_DONE;
818 }
819
820 static struct notifier_block rtnetlink_dev_notifier = {
821 .notifier_call = rtnetlink_event,
822 };
823
824 void __init rtnetlink_init(void)
825 {
826 int i;
827
828 rtattr_max = 0;
829 for (i = 0; i < ARRAY_SIZE(rta_max); i++)
830 if (rta_max[i] > rtattr_max)
831 rtattr_max = rta_max[i];
832 rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL);
833 if (!rta_buf)
834 panic("rtnetlink_init: cannot allocate rta_buf\n");
835
836 rtnl = netlink_kernel_create(NETLINK_ROUTE, RTNLGRP_MAX, rtnetlink_rcv,
837 THIS_MODULE);
838 if (rtnl == NULL)
839 panic("rtnetlink_init: cannot initialize rtnetlink\n");
840 netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV);
841 register_netdevice_notifier(&rtnetlink_dev_notifier);
842 rtnetlink_links[PF_UNSPEC] = link_rtnetlink_table;
843 rtnetlink_links[PF_PACKET] = link_rtnetlink_table;
844 }
845
846 EXPORT_SYMBOL(__rta_fill);
847 EXPORT_SYMBOL(rtattr_strlcpy);
848 EXPORT_SYMBOL(rtattr_parse);
849 EXPORT_SYMBOL(rtnetlink_links);
850 EXPORT_SYMBOL(rtnetlink_put_metrics);
851 EXPORT_SYMBOL(rtnl_lock);
852 EXPORT_SYMBOL(rtnl_trylock);
853 EXPORT_SYMBOL(rtnl_unlock);
854 EXPORT_SYMBOL(rtnl_unicast);
855 EXPORT_SYMBOL(rtnl_notify);
856 EXPORT_SYMBOL(rtnl_set_sk_err);
Linux kernel - Deliverables
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