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