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[NET]: Convert link dumping to new netlink api
[linux-2.6.git] / net / core / rtnetlink.c
blob93ba04fb84442c4d06717c538efd28d84eadf6eb
1 /*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * Routing netlink socket interface: protocol independent part.
7 *
8 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
14 *
15 * Fixes:
16 * Vitaly E. Lavrov RTA_OK arithmetics was wrong.
17 */
18
19 #include <linux/errno.h>
20 #include <linux/module.h>
21 #include <linux/types.h>
22 #include <linux/socket.h>
23 #include <linux/kernel.h>
24 #include <linux/sched.h>
25 #include <linux/timer.h>
26 #include <linux/string.h>
27 #include <linux/sockios.h>
28 #include <linux/net.h>
29 #include <linux/fcntl.h>
30 #include <linux/mm.h>
31 #include <linux/slab.h>
32 #include <linux/interrupt.h>
33 #include <linux/capability.h>
34 #include <linux/skbuff.h>
35 #include <linux/init.h>
36 #include <linux/security.h>
37 #include <linux/mutex.h>
38 #include <linux/if_addr.h>
39
40 #include <asm/uaccess.h>
41 #include <asm/system.h>
42 #include <asm/string.h>
43
44 #include <linux/inet.h>
45 #include <linux/netdevice.h>
46 #include <net/ip.h>
47 #include <net/protocol.h>
48 #include <net/arp.h>
49 #include <net/route.h>
50 #include <net/udp.h>
51 #include <net/sock.h>
52 #include <net/pkt_sched.h>
53 #include <net/fib_rules.h>
54 #include <net/netlink.h>
55 #ifdef CONFIG_NET_WIRELESS_RTNETLINK
56 #include <linux/wireless.h>
57 #include <net/iw_handler.h>
58 #endif /* CONFIG_NET_WIRELESS_RTNETLINK */
59
60 static DEFINE_MUTEX(rtnl_mutex);
61
62 void rtnl_lock(void)
63 {
64 mutex_lock(&rtnl_mutex);
65 }
66
67 void __rtnl_unlock(void)
68 {
69 mutex_unlock(&rtnl_mutex);
70 }
71
72 void rtnl_unlock(void)
73 {
74 mutex_unlock(&rtnl_mutex);
75 if (rtnl && rtnl->sk_receive_queue.qlen)
76 rtnl->sk_data_ready(rtnl, 0);
77 netdev_run_todo();
78 }
79
80 int rtnl_trylock(void)
81 {
82 return mutex_trylock(&rtnl_mutex);
83 }
84
85 int rtattr_parse(struct rtattr *tb[], int maxattr, struct rtattr *rta, int len)
86 {
87 memset(tb, 0, sizeof(struct rtattr*)*maxattr);
88
89 while (RTA_OK(rta, len)) {
90 unsigned flavor = rta->rta_type;
91 if (flavor && flavor <= maxattr)
92 tb[flavor-1] = rta;
93 rta = RTA_NEXT(rta, len);
94 }
95 return 0;
96 }
97
98 struct sock *rtnl;
99
100 struct rtnetlink_link * rtnetlink_links[NPROTO];
101
102 static const int rtm_min[RTM_NR_FAMILIES] =
103 {
104 [RTM_FAM(RTM_NEWLINK)] = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
105 [RTM_FAM(RTM_NEWADDR)] = NLMSG_LENGTH(sizeof(struct ifaddrmsg)),
106 [RTM_FAM(RTM_NEWROUTE)] = NLMSG_LENGTH(sizeof(struct rtmsg)),
107 [RTM_FAM(RTM_NEWNEIGH)] = NLMSG_LENGTH(sizeof(struct ndmsg)),
108 [RTM_FAM(RTM_NEWRULE)] = NLMSG_LENGTH(sizeof(struct fib_rule_hdr)),
109 [RTM_FAM(RTM_NEWQDISC)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
110 [RTM_FAM(RTM_NEWTCLASS)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
111 [RTM_FAM(RTM_NEWTFILTER)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
112 [RTM_FAM(RTM_NEWACTION)] = NLMSG_LENGTH(sizeof(struct tcamsg)),
113 [RTM_FAM(RTM_NEWPREFIX)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
114 [RTM_FAM(RTM_GETMULTICAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
115 [RTM_FAM(RTM_GETANYCAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
116 [RTM_FAM(RTM_NEWNEIGHTBL)] = NLMSG_LENGTH(sizeof(struct ndtmsg)),
117 };
118
119 static const int rta_max[RTM_NR_FAMILIES] =
120 {
121 [RTM_FAM(RTM_NEWLINK)] = IFLA_MAX,
122 [RTM_FAM(RTM_NEWADDR)] = IFA_MAX,
123 [RTM_FAM(RTM_NEWROUTE)] = RTA_MAX,
124 [RTM_FAM(RTM_NEWNEIGH)] = NDA_MAX,
125 [RTM_FAM(RTM_NEWRULE)] = FRA_MAX,
126 [RTM_FAM(RTM_NEWQDISC)] = TCA_MAX,
127 [RTM_FAM(RTM_NEWTCLASS)] = TCA_MAX,
128 [RTM_FAM(RTM_NEWTFILTER)] = TCA_MAX,
129 [RTM_FAM(RTM_NEWACTION)] = TCAA_MAX,
130 [RTM_FAM(RTM_NEWNEIGHTBL)] = NDTA_MAX,
131 };
132
133 void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const void *data)
134 {
135 struct rtattr *rta;
136 int size = RTA_LENGTH(attrlen);
137
138 rta = (struct rtattr*)skb_put(skb, RTA_ALIGN(size));
139 rta->rta_type = attrtype;
140 rta->rta_len = size;
141 memcpy(RTA_DATA(rta), data, attrlen);
142 memset(RTA_DATA(rta) + attrlen, 0, RTA_ALIGN(size) - size);
143 }
144
145 size_t rtattr_strlcpy(char *dest, const struct rtattr *rta, size_t size)
146 {
147 size_t ret = RTA_PAYLOAD(rta);
148 char *src = RTA_DATA(rta);
149
150 if (ret > 0 && src[ret - 1] == '\0')
151 ret--;
152 if (size > 0) {
153 size_t len = (ret >= size) ? size - 1 : ret;
154 memset(dest, 0, size);
155 memcpy(dest, src, len);
156 }
157 return ret;
158 }
159
160 int rtnetlink_send(struct sk_buff *skb, u32 pid, unsigned group, int echo)
161 {
162 int err = 0;
163
164 NETLINK_CB(skb).dst_group = group;
165 if (echo)
166 atomic_inc(&skb->users);
167 netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL);
168 if (echo)
169 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
170 return err;
171 }
172
173 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics)
174 {
175 struct rtattr *mx = (struct rtattr*)skb->tail;
176 int i;
177
178 RTA_PUT(skb, RTA_METRICS, 0, NULL);
179 for (i=0; i<RTAX_MAX; i++) {
180 if (metrics[i])
181 RTA_PUT(skb, i+1, sizeof(u32), metrics+i);
182 }
183 mx->rta_len = skb->tail - (u8*)mx;
184 if (mx->rta_len == RTA_LENGTH(0))
185 skb_trim(skb, (u8*)mx - skb->data);
186 return 0;
187
188 rtattr_failure:
189 skb_trim(skb, (u8*)mx - skb->data);
190 return -1;
191 }
192
193
194 static void set_operstate(struct net_device *dev, unsigned char transition)
195 {
196 unsigned char operstate = dev->operstate;
197
198 switch(transition) {
199 case IF_OPER_UP:
200 if ((operstate == IF_OPER_DORMANT ||
201 operstate == IF_OPER_UNKNOWN) &&
202 !netif_dormant(dev))
203 operstate = IF_OPER_UP;
204 break;
205
206 case IF_OPER_DORMANT:
207 if (operstate == IF_OPER_UP ||
208 operstate == IF_OPER_UNKNOWN)
209 operstate = IF_OPER_DORMANT;
210 break;
211 };
212
213 if (dev->operstate != operstate) {
214 write_lock_bh(&dev_base_lock);
215 dev->operstate = operstate;
216 write_unlock_bh(&dev_base_lock);
217 netdev_state_change(dev);
218 }
219 }
220
221 static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
222 struct net_device_stats *b)
223 {
224 a->rx_packets = b->rx_packets;
225 a->tx_packets = b->tx_packets;
226 a->rx_bytes = b->rx_bytes;
227 a->tx_bytes = b->tx_bytes;
228 a->rx_errors = b->rx_errors;
229 a->tx_errors = b->tx_errors;
230 a->rx_dropped = b->rx_dropped;
231 a->tx_dropped = b->tx_dropped;
232
233 a->multicast = b->multicast;
234 a->collisions = b->collisions;
235
236 a->rx_length_errors = b->rx_length_errors;
237 a->rx_over_errors = b->rx_over_errors;
238 a->rx_crc_errors = b->rx_crc_errors;
239 a->rx_frame_errors = b->rx_frame_errors;
240 a->rx_fifo_errors = b->rx_fifo_errors;
241 a->rx_missed_errors = b->rx_missed_errors;
242
243 a->tx_aborted_errors = b->tx_aborted_errors;
244 a->tx_carrier_errors = b->tx_carrier_errors;
245 a->tx_fifo_errors = b->tx_fifo_errors;
246 a->tx_heartbeat_errors = b->tx_heartbeat_errors;
247 a->tx_window_errors = b->tx_window_errors;
248
249 a->rx_compressed = b->rx_compressed;
250 a->tx_compressed = b->tx_compressed;
251 };
252
253 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
254 void *iwbuf, int iwbuflen, int type, u32 pid,
255 u32 seq, u32 change, unsigned int flags)
256 {
257 struct ifinfomsg *ifm;
258 struct nlmsghdr *nlh;
259
260 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
261 if (nlh == NULL)
262 return -ENOBUFS;
263
264 ifm = nlmsg_data(nlh);
265 ifm->ifi_family = AF_UNSPEC;
266 ifm->__ifi_pad = 0;
267 ifm->ifi_type = dev->type;
268 ifm->ifi_index = dev->ifindex;
269 ifm->ifi_flags = dev_get_flags(dev);
270 ifm->ifi_change = change;
271
272 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
273 NLA_PUT_U32(skb, IFLA_TXQLEN, dev->tx_queue_len);
274 NLA_PUT_U32(skb, IFLA_WEIGHT, dev->weight);
275 NLA_PUT_U8(skb, IFLA_OPERSTATE,
276 netif_running(dev) ? dev->operstate : IF_OPER_DOWN);
277 NLA_PUT_U8(skb, IFLA_LINKMODE, dev->link_mode);
278 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
279
280 if (dev->ifindex != dev->iflink)
281 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
282
283 if (dev->master)
284 NLA_PUT_U32(skb, IFLA_MASTER, dev->master->ifindex);
285
286 if (dev->qdisc_sleeping)
287 NLA_PUT_STRING(skb, IFLA_QDISC, dev->qdisc_sleeping->ops->id);
288
289 if (1) {
290 struct rtnl_link_ifmap map = {
291 .mem_start = dev->mem_start,
292 .mem_end = dev->mem_end,
293 .base_addr = dev->base_addr,
294 .irq = dev->irq,
295 .dma = dev->dma,
296 .port = dev->if_port,
297 };
298 NLA_PUT(skb, IFLA_MAP, sizeof(map), &map);
299 }
300
301 if (dev->addr_len) {
302 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
303 NLA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast);
304 }
305
306 if (dev->get_stats) {
307 struct net_device_stats *stats = dev->get_stats(dev);
308 if (stats) {
309 struct nlattr *attr;
310
311 attr = nla_reserve(skb, IFLA_STATS,
312 sizeof(struct rtnl_link_stats));
313 if (attr == NULL)
314 goto nla_put_failure;
315
316 copy_rtnl_link_stats(nla_data(attr), stats);
317 }
318 }
319
320 if (iwbuf)
321 NLA_PUT(skb, IFLA_WIRELESS, iwbuflen, iwbuf);
322
323 return nlmsg_end(skb, nlh);
324
325 nla_put_failure:
326 return nlmsg_cancel(skb, nlh);
327 }
328
329 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
330 {
331 int idx;
332 int s_idx = cb->args[0];
333 struct net_device *dev;
334
335 read_lock(&dev_base_lock);
336 for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) {
337 if (idx < s_idx)
338 continue;
339 if (rtnl_fill_ifinfo(skb, dev, NULL, 0, RTM_NEWLINK,
340 NETLINK_CB(cb->skb).pid,
341 cb->nlh->nlmsg_seq, 0, NLM_F_MULTI) <= 0)
342 break;
343 }
344 read_unlock(&dev_base_lock);
345 cb->args[0] = idx;
346
347 return skb->len;
348 }
349
350 static struct nla_policy ifla_policy[IFLA_MAX+1] __read_mostly = {
351 [IFLA_IFNAME] = { .type = NLA_STRING },
352 [IFLA_MAP] = { .minlen = sizeof(struct rtnl_link_ifmap) },
353 [IFLA_MTU] = { .type = NLA_U32 },
354 [IFLA_TXQLEN] = { .type = NLA_U32 },
355 [IFLA_WEIGHT] = { .type = NLA_U32 },
356 [IFLA_OPERSTATE] = { .type = NLA_U8 },
357 [IFLA_LINKMODE] = { .type = NLA_U8 },
358 };
359
360 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
361 {
362 struct ifinfomsg *ifm;
363 struct net_device *dev;
364 int err, send_addr_notify = 0, modified = 0;
365 struct nlattr *tb[IFLA_MAX+1];
366 char ifname[IFNAMSIZ];
367
368 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
369 if (err < 0)
370 goto errout;
371
372 if (tb[IFLA_IFNAME] &&
373 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ) >= IFNAMSIZ)
374 return -EINVAL;
375
376 err = -EINVAL;
377 ifm = nlmsg_data(nlh);
378 if (ifm->ifi_index >= 0)
379 dev = dev_get_by_index(ifm->ifi_index);
380 else if (tb[IFLA_IFNAME])
381 dev = dev_get_by_name(ifname);
382 else
383 goto errout;
384
385 if (dev == NULL) {
386 err = -ENODEV;
387 goto errout;
388 }
389
390 if (tb[IFLA_ADDRESS] &&
391 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
392 goto errout_dev;
393
394 if (tb[IFLA_BROADCAST] &&
395 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
396 goto errout_dev;
397
398 if (tb[IFLA_MAP]) {
399 struct rtnl_link_ifmap *u_map;
400 struct ifmap k_map;
401
402 if (!dev->set_config) {
403 err = -EOPNOTSUPP;
404 goto errout_dev;
405 }
406
407 if (!netif_device_present(dev)) {
408 err = -ENODEV;
409 goto errout_dev;
410 }
411
412 u_map = nla_data(tb[IFLA_MAP]);
413 k_map.mem_start = (unsigned long) u_map->mem_start;
414 k_map.mem_end = (unsigned long) u_map->mem_end;
415 k_map.base_addr = (unsigned short) u_map->base_addr;
416 k_map.irq = (unsigned char) u_map->irq;
417 k_map.dma = (unsigned char) u_map->dma;
418 k_map.port = (unsigned char) u_map->port;
419
420 err = dev->set_config(dev, &k_map);
421 if (err < 0)
422 goto errout_dev;
423
424 modified = 1;
425 }
426
427 if (tb[IFLA_ADDRESS]) {
428 struct sockaddr *sa;
429 int len;
430
431 if (!dev->set_mac_address) {
432 err = -EOPNOTSUPP;
433 goto errout_dev;
434 }
435
436 if (!netif_device_present(dev)) {
437 err = -ENODEV;
438 goto errout_dev;
439 }
440
441 len = sizeof(sa_family_t) + dev->addr_len;
442 sa = kmalloc(len, GFP_KERNEL);
443 if (!sa) {
444 err = -ENOMEM;
445 goto errout_dev;
446 }
447 sa->sa_family = dev->type;
448 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
449 dev->addr_len);
450 err = dev->set_mac_address(dev, sa);
451 kfree(sa);
452 if (err)
453 goto errout_dev;
454 send_addr_notify = 1;
455 modified = 1;
456 }
457
458 if (tb[IFLA_MTU]) {
459 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
460 if (err < 0)
461 goto errout_dev;
462 modified = 1;
463 }
464
465 /*
466 * Interface selected by interface index but interface
467 * name provided implies that a name change has been
468 * requested.
469 */
470 if (ifm->ifi_index >= 0 && ifname[0]) {
471 err = dev_change_name(dev, ifname);
472 if (err < 0)
473 goto errout_dev;
474 modified = 1;
475 }
476
477 #ifdef CONFIG_NET_WIRELESS_RTNETLINK
478 if (tb[IFLA_WIRELESS]) {
479 /* Call Wireless Extensions.
480 * Various stuff checked in there... */
481 err = wireless_rtnetlink_set(dev, nla_data(tb[IFLA_WIRELESS]),
482 nla_len(tb[IFLA_WIRELESS]));
483 if (err < 0)
484 goto errout_dev;
485 }
486 #endif /* CONFIG_NET_WIRELESS_RTNETLINK */
487
488 if (tb[IFLA_BROADCAST]) {
489 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
490 send_addr_notify = 1;
491 }
492
493
494 if (ifm->ifi_flags)
495 dev_change_flags(dev, ifm->ifi_flags);
496
497 if (tb[IFLA_TXQLEN])
498 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
499
500 if (tb[IFLA_WEIGHT])
501 dev->weight = nla_get_u32(tb[IFLA_WEIGHT]);
502
503 if (tb[IFLA_OPERSTATE])
504 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
505
506 if (tb[IFLA_LINKMODE]) {
507 write_lock_bh(&dev_base_lock);
508 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
509 write_unlock_bh(&dev_base_lock);
510 }
511
512 err = 0;
513
514 errout_dev:
515 if (err < 0 && modified && net_ratelimit())
516 printk(KERN_WARNING "A link change request failed with "
517 "some changes comitted already. Interface %s may "
518 "have been left with an inconsistent configuration, "
519 "please check.\n", dev->name);
520
521 if (send_addr_notify)
522 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
523
524 dev_put(dev);
525 errout:
526 return err;
527 }
528
529 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
530 {
531 struct ifinfomsg *ifm;
532 struct nlattr *tb[IFLA_MAX+1];
533 struct net_device *dev = NULL;
534 struct sk_buff *nskb;
535 char *iw_buf = NULL, *iw = NULL;
536 int iw_buf_len = 0;
537 int err, payload;
538
539 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
540 if (err < 0)
541 goto errout;
542
543 ifm = nlmsg_data(nlh);
544 if (ifm->ifi_index >= 0) {
545 dev = dev_get_by_index(ifm->ifi_index);
546 if (dev == NULL)
547 return -ENODEV;
548 } else
549 return -EINVAL;
550
551
552 #ifdef CONFIG_NET_WIRELESS_RTNETLINK
553 if (tb[IFLA_WIRELESS]) {
554 /* Call Wireless Extensions. We need to know the size before
555 * we can alloc. Various stuff checked in there... */
556 err = wireless_rtnetlink_get(dev, nla_data(tb[IFLA_WIRELESS]),
557 nla_len(tb[IFLA_WIRELESS]),
558 &iw_buf, &iw_buf_len);
559 if (err < 0)
560 goto errout;
561
562 iw += IW_EV_POINT_OFF;
563 }
564 #endif /* CONFIG_NET_WIRELESS_RTNETLINK */
565
566 payload = NLMSG_ALIGN(sizeof(struct ifinfomsg) +
567 nla_total_size(iw_buf_len));
568 nskb = nlmsg_new(nlmsg_total_size(payload), GFP_KERNEL);
569 if (nskb == NULL) {
570 err = -ENOBUFS;
571 goto errout;
572 }
573
574 err = rtnl_fill_ifinfo(nskb, dev, iw, iw_buf_len, RTM_NEWLINK,
575 NETLINK_CB(skb).pid, nlh->nlmsg_seq, 0, 0);
576 if (err <= 0) {
577 kfree_skb(skb);
578 goto errout;
579 }
580
581 err = netlink_unicast(rtnl, skb, NETLINK_CB(skb).pid, MSG_DONTWAIT);
582 if (err > 0)
583 err = 0;
584 errout:
585 kfree(iw_buf);
586 dev_put(dev);
587
588 return err;
589 }
590
591 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
592 {
593 int idx;
594 int s_idx = cb->family;
595
596 if (s_idx == 0)
597 s_idx = 1;
598 for (idx=1; idx<NPROTO; idx++) {
599 int type = cb->nlh->nlmsg_type-RTM_BASE;
600 if (idx < s_idx || idx == PF_PACKET)
601 continue;
602 if (rtnetlink_links[idx] == NULL ||
603 rtnetlink_links[idx][type].dumpit == NULL)
604 continue;
605 if (idx > s_idx)
606 memset(&cb->args[0], 0, sizeof(cb->args));
607 if (rtnetlink_links[idx][type].dumpit(skb, cb))
608 break;
609 }
610 cb->family = idx;
611
612 return skb->len;
613 }
614
615 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change)
616 {
617 struct sk_buff *skb;
618 int size = NLMSG_SPACE(sizeof(struct ifinfomsg) +
619 sizeof(struct rtnl_link_ifmap) +
620 sizeof(struct rtnl_link_stats) + 128);
621
622 skb = nlmsg_new(size, GFP_KERNEL);
623 if (!skb)
624 return;
625
626 if (rtnl_fill_ifinfo(skb, dev, NULL, 0, type, 0, 0, change, 0) < 0) {
627 kfree_skb(skb);
628 return;
629 }
630 NETLINK_CB(skb).dst_group = RTNLGRP_LINK;
631 netlink_broadcast(rtnl, skb, 0, RTNLGRP_LINK, GFP_KERNEL);
632 }
633
634 /* Protected by RTNL sempahore. */
635 static struct rtattr **rta_buf;
636 static int rtattr_max;
637
638 /* Process one rtnetlink message. */
639
640 static __inline__ int
641 rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, int *errp)
642 {
643 struct rtnetlink_link *link;
644 struct rtnetlink_link *link_tab;
645 int sz_idx, kind;
646 int min_len;
647 int family;
648 int type;
649 int err;
650
651 /* Only requests are handled by kernel now */
652 if (!(nlh->nlmsg_flags&NLM_F_REQUEST))
653 return 0;
654
655 type = nlh->nlmsg_type;
656
657 /* A control message: ignore them */
658 if (type < RTM_BASE)
659 return 0;
660
661 /* Unknown message: reply with EINVAL */
662 if (type > RTM_MAX)
663 goto err_inval;
664
665 type -= RTM_BASE;
666
667 /* All the messages must have at least 1 byte length */
668 if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg)))
669 return 0;
670
671 family = ((struct rtgenmsg*)NLMSG_DATA(nlh))->rtgen_family;
672 if (family >= NPROTO) {
673 *errp = -EAFNOSUPPORT;
674 return -1;
675 }
676
677 link_tab = rtnetlink_links[family];
678 if (link_tab == NULL)
679 link_tab = rtnetlink_links[PF_UNSPEC];
680 link = &link_tab[type];
681
682 sz_idx = type>>2;
683 kind = type&3;
684
685 if (kind != 2 && security_netlink_recv(skb, CAP_NET_ADMIN)) {
686 *errp = -EPERM;
687 return -1;
688 }
689
690 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
691 if (link->dumpit == NULL)
692 link = &(rtnetlink_links[PF_UNSPEC][type]);
693
694 if (link->dumpit == NULL)
695 goto err_inval;
696
697 if ((*errp = netlink_dump_start(rtnl, skb, nlh,
698 link->dumpit, NULL)) != 0) {
699 return -1;
700 }
701
702 netlink_queue_skip(nlh, skb);
703 return -1;
704 }
705
706 memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *)));
707
708 min_len = rtm_min[sz_idx];
709 if (nlh->nlmsg_len < min_len)
710 goto err_inval;
711
712 if (nlh->nlmsg_len > min_len) {
713 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
714 struct rtattr *attr = (void*)nlh + NLMSG_ALIGN(min_len);
715
716 while (RTA_OK(attr, attrlen)) {
717 unsigned flavor = attr->rta_type;
718 if (flavor) {
719 if (flavor > rta_max[sz_idx])
720 goto err_inval;
721 rta_buf[flavor-1] = attr;
722 }
723 attr = RTA_NEXT(attr, attrlen);
724 }
725 }
726
727 if (link->doit == NULL)
728 link = &(rtnetlink_links[PF_UNSPEC][type]);
729 if (link->doit == NULL)
730 goto err_inval;
731 err = link->doit(skb, nlh, (void *)&rta_buf[0]);
732
733 *errp = err;
734 return err;
735
736 err_inval:
737 *errp = -EINVAL;
738 return -1;
739 }
740
741 static void rtnetlink_rcv(struct sock *sk, int len)
742 {
743 unsigned int qlen = 0;
744
745 do {
746 mutex_lock(&rtnl_mutex);
747 netlink_run_queue(sk, &qlen, &rtnetlink_rcv_msg);
748 mutex_unlock(&rtnl_mutex);
749
750 netdev_run_todo();
751 } while (qlen);
752 }
753
754 static struct rtnetlink_link link_rtnetlink_table[RTM_NR_MSGTYPES] =
755 {
756 [RTM_GETLINK - RTM_BASE] = { .doit = rtnl_getlink,
757 .dumpit = rtnl_dump_ifinfo },
758 [RTM_SETLINK - RTM_BASE] = { .doit = rtnl_setlink },
759 [RTM_GETADDR - RTM_BASE] = { .dumpit = rtnl_dump_all },
760 [RTM_GETROUTE - RTM_BASE] = { .dumpit = rtnl_dump_all },
761 [RTM_NEWNEIGH - RTM_BASE] = { .doit = neigh_add },
762 [RTM_DELNEIGH - RTM_BASE] = { .doit = neigh_delete },
763 [RTM_GETNEIGH - RTM_BASE] = { .dumpit = neigh_dump_info },
764 #ifdef CONFIG_FIB_RULES
765 [RTM_NEWRULE - RTM_BASE] = { .doit = fib_nl_newrule },
766 [RTM_DELRULE - RTM_BASE] = { .doit = fib_nl_delrule },
767 #endif
768 [RTM_GETRULE - RTM_BASE] = { .dumpit = rtnl_dump_all },
769 [RTM_GETNEIGHTBL - RTM_BASE] = { .dumpit = neightbl_dump_info },
770 [RTM_SETNEIGHTBL - RTM_BASE] = { .doit = neightbl_set },
771 };
772
773 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
774 {
775 struct net_device *dev = ptr;
776 switch (event) {
777 case NETDEV_UNREGISTER:
778 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);
779 break;
780 case NETDEV_REGISTER:
781 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
782 break;
783 case NETDEV_UP:
784 case NETDEV_DOWN:
785 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
786 break;
787 case NETDEV_CHANGE:
788 case NETDEV_GOING_DOWN:
789 break;
790 default:
791 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
792 break;
793 }
794 return NOTIFY_DONE;
795 }
796
797 static struct notifier_block rtnetlink_dev_notifier = {
798 .notifier_call = rtnetlink_event,
799 };
800
801 void __init rtnetlink_init(void)
802 {
803 int i;
804
805 rtattr_max = 0;
806 for (i = 0; i < ARRAY_SIZE(rta_max); i++)
807 if (rta_max[i] > rtattr_max)
808 rtattr_max = rta_max[i];
809 rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL);
810 if (!rta_buf)
811 panic("rtnetlink_init: cannot allocate rta_buf\n");
812
813 rtnl = netlink_kernel_create(NETLINK_ROUTE, RTNLGRP_MAX, rtnetlink_rcv,
814 THIS_MODULE);
815 if (rtnl == NULL)
816 panic("rtnetlink_init: cannot initialize rtnetlink\n");
817 netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV);
818 register_netdevice_notifier(&rtnetlink_dev_notifier);
819 rtnetlink_links[PF_UNSPEC] = link_rtnetlink_table;
820 rtnetlink_links[PF_PACKET] = link_rtnetlink_table;
821 }
822
823 EXPORT_SYMBOL(__rta_fill);
824 EXPORT_SYMBOL(rtattr_strlcpy);
825 EXPORT_SYMBOL(rtattr_parse);
826 EXPORT_SYMBOL(rtnetlink_links);
827 EXPORT_SYMBOL(rtnetlink_put_metrics);
828 EXPORT_SYMBOL(rtnl);
829 EXPORT_SYMBOL(rtnl_lock);
830 EXPORT_SYMBOL(rtnl_trylock);
831 EXPORT_SYMBOL(rtnl_unlock);
Linus' kernel tree