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[POWERPC] ps3: don't call ps3_system_bus_driver_register on other platforms
[linux-2.6/lfs.git] / net / core / rtnetlink.c
blob6055074c4b81eb83ee2be5ea7cce4228185e825f
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/timer.h>
25 #include <linux/string.h>
26 #include <linux/sockios.h>
27 #include <linux/net.h>
28 #include <linux/fcntl.h>
29 #include <linux/mm.h>
30 #include <linux/slab.h>
31 #include <linux/interrupt.h>
32 #include <linux/capability.h>
33 #include <linux/skbuff.h>
34 #include <linux/init.h>
35 #include <linux/security.h>
36 #include <linux/mutex.h>
37 #include <linux/if_addr.h>
38
39 #include <asm/uaccess.h>
40 #include <asm/system.h>
41 #include <asm/string.h>
42
43 #include <linux/inet.h>
44 #include <linux/netdevice.h>
45 #include <net/ip.h>
46 #include <net/protocol.h>
47 #include <net/arp.h>
48 #include <net/route.h>
49 #include <net/udp.h>
50 #include <net/sock.h>
51 #include <net/pkt_sched.h>
52 #include <net/fib_rules.h>
53 #include <net/netlink.h>
54 #ifdef CONFIG_NET_WIRELESS_RTNETLINK
55 #include <linux/wireless.h>
56 #include <net/iw_handler.h>
57 #endif /* CONFIG_NET_WIRELESS_RTNETLINK */
58
59 static DEFINE_MUTEX(rtnl_mutex);
60 static struct sock *rtnl;
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 rtnetlink_link * rtnetlink_links[NPROTO];
99
100 static const int rtm_min[RTM_NR_FAMILIES] =
101 {
102 [RTM_FAM(RTM_NEWLINK)] = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
103 [RTM_FAM(RTM_NEWADDR)] = NLMSG_LENGTH(sizeof(struct ifaddrmsg)),
104 [RTM_FAM(RTM_NEWROUTE)] = NLMSG_LENGTH(sizeof(struct rtmsg)),
105 [RTM_FAM(RTM_NEWRULE)] = NLMSG_LENGTH(sizeof(struct fib_rule_hdr)),
106 [RTM_FAM(RTM_NEWQDISC)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
107 [RTM_FAM(RTM_NEWTCLASS)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
108 [RTM_FAM(RTM_NEWTFILTER)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
109 [RTM_FAM(RTM_NEWACTION)] = NLMSG_LENGTH(sizeof(struct tcamsg)),
110 [RTM_FAM(RTM_GETMULTICAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
111 [RTM_FAM(RTM_GETANYCAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
112 };
113
114 static const int rta_max[RTM_NR_FAMILIES] =
115 {
116 [RTM_FAM(RTM_NEWLINK)] = IFLA_MAX,
117 [RTM_FAM(RTM_NEWADDR)] = IFA_MAX,
118 [RTM_FAM(RTM_NEWROUTE)] = RTA_MAX,
119 [RTM_FAM(RTM_NEWRULE)] = FRA_MAX,
120 [RTM_FAM(RTM_NEWQDISC)] = TCA_MAX,
121 [RTM_FAM(RTM_NEWTCLASS)] = TCA_MAX,
122 [RTM_FAM(RTM_NEWTFILTER)] = TCA_MAX,
123 [RTM_FAM(RTM_NEWACTION)] = TCAA_MAX,
124 };
125
126 void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const void *data)
127 {
128 struct rtattr *rta;
129 int size = RTA_LENGTH(attrlen);
130
131 rta = (struct rtattr*)skb_put(skb, RTA_ALIGN(size));
132 rta->rta_type = attrtype;
133 rta->rta_len = size;
134 memcpy(RTA_DATA(rta), data, attrlen);
135 memset(RTA_DATA(rta) + attrlen, 0, RTA_ALIGN(size) - size);
136 }
137
138 size_t rtattr_strlcpy(char *dest, const struct rtattr *rta, size_t size)
139 {
140 size_t ret = RTA_PAYLOAD(rta);
141 char *src = RTA_DATA(rta);
142
143 if (ret > 0 && src[ret - 1] == '\0')
144 ret--;
145 if (size > 0) {
146 size_t len = (ret >= size) ? size - 1 : ret;
147 memset(dest, 0, size);
148 memcpy(dest, src, len);
149 }
150 return ret;
151 }
152
153 int rtnetlink_send(struct sk_buff *skb, u32 pid, unsigned group, int echo)
154 {
155 int err = 0;
156
157 NETLINK_CB(skb).dst_group = group;
158 if (echo)
159 atomic_inc(&skb->users);
160 netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL);
161 if (echo)
162 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
163 return err;
164 }
165
166 int rtnl_unicast(struct sk_buff *skb, u32 pid)
167 {
168 return nlmsg_unicast(rtnl, skb, pid);
169 }
170
171 int rtnl_notify(struct sk_buff *skb, u32 pid, u32 group,
172 struct nlmsghdr *nlh, gfp_t flags)
173 {
174 int report = 0;
175
176 if (nlh)
177 report = nlmsg_report(nlh);
178
179 return nlmsg_notify(rtnl, skb, pid, group, report, flags);
180 }
181
182 void rtnl_set_sk_err(u32 group, int error)
183 {
184 netlink_set_err(rtnl, 0, group, error);
185 }
186
187 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics)
188 {
189 struct nlattr *mx;
190 int i, valid = 0;
191
192 mx = nla_nest_start(skb, RTA_METRICS);
193 if (mx == NULL)
194 return -ENOBUFS;
195
196 for (i = 0; i < RTAX_MAX; i++) {
197 if (metrics[i]) {
198 valid++;
199 NLA_PUT_U32(skb, i+1, metrics[i]);
200 }
201 }
202
203 if (!valid) {
204 nla_nest_cancel(skb, mx);
205 return 0;
206 }
207
208 return nla_nest_end(skb, mx);
209
210 nla_put_failure:
211 return nla_nest_cancel(skb, mx);
212 }
213
214 int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id,
215 u32 ts, u32 tsage, long expires, u32 error)
216 {
217 struct rta_cacheinfo ci = {
218 .rta_lastuse = jiffies_to_clock_t(jiffies - dst->lastuse),
219 .rta_used = dst->__use,
220 .rta_clntref = atomic_read(&(dst->__refcnt)),
221 .rta_error = error,
222 .rta_id = id,
223 .rta_ts = ts,
224 .rta_tsage = tsage,
225 };
226
227 if (expires)
228 ci.rta_expires = jiffies_to_clock_t(expires);
229
230 return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci);
231 }
232
233 EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo);
234
235 static void set_operstate(struct net_device *dev, unsigned char transition)
236 {
237 unsigned char operstate = dev->operstate;
238
239 switch(transition) {
240 case IF_OPER_UP:
241 if ((operstate == IF_OPER_DORMANT ||
242 operstate == IF_OPER_UNKNOWN) &&
243 !netif_dormant(dev))
244 operstate = IF_OPER_UP;
245 break;
246
247 case IF_OPER_DORMANT:
248 if (operstate == IF_OPER_UP ||
249 operstate == IF_OPER_UNKNOWN)
250 operstate = IF_OPER_DORMANT;
251 break;
252 };
253
254 if (dev->operstate != operstate) {
255 write_lock_bh(&dev_base_lock);
256 dev->operstate = operstate;
257 write_unlock_bh(&dev_base_lock);
258 netdev_state_change(dev);
259 }
260 }
261
262 static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
263 struct net_device_stats *b)
264 {
265 a->rx_packets = b->rx_packets;
266 a->tx_packets = b->tx_packets;
267 a->rx_bytes = b->rx_bytes;
268 a->tx_bytes = b->tx_bytes;
269 a->rx_errors = b->rx_errors;
270 a->tx_errors = b->tx_errors;
271 a->rx_dropped = b->rx_dropped;
272 a->tx_dropped = b->tx_dropped;
273
274 a->multicast = b->multicast;
275 a->collisions = b->collisions;
276
277 a->rx_length_errors = b->rx_length_errors;
278 a->rx_over_errors = b->rx_over_errors;
279 a->rx_crc_errors = b->rx_crc_errors;
280 a->rx_frame_errors = b->rx_frame_errors;
281 a->rx_fifo_errors = b->rx_fifo_errors;
282 a->rx_missed_errors = b->rx_missed_errors;
283
284 a->tx_aborted_errors = b->tx_aborted_errors;
285 a->tx_carrier_errors = b->tx_carrier_errors;
286 a->tx_fifo_errors = b->tx_fifo_errors;
287 a->tx_heartbeat_errors = b->tx_heartbeat_errors;
288 a->tx_window_errors = b->tx_window_errors;
289
290 a->rx_compressed = b->rx_compressed;
291 a->tx_compressed = b->tx_compressed;
292 };
293
294 static inline size_t if_nlmsg_size(int iwbuflen)
295 {
296 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
297 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
298 + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */
299 + nla_total_size(sizeof(struct rtnl_link_ifmap))
300 + nla_total_size(sizeof(struct rtnl_link_stats))
301 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
302 + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */
303 + nla_total_size(4) /* IFLA_TXQLEN */
304 + nla_total_size(4) /* IFLA_WEIGHT */
305 + nla_total_size(4) /* IFLA_MTU */
306 + nla_total_size(4) /* IFLA_LINK */
307 + nla_total_size(4) /* IFLA_MASTER */
308 + nla_total_size(1) /* IFLA_OPERSTATE */
309 + nla_total_size(1) /* IFLA_LINKMODE */
310 + nla_total_size(iwbuflen);
311 }
312
313 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
314 void *iwbuf, int iwbuflen, int type, u32 pid,
315 u32 seq, u32 change, unsigned int flags)
316 {
317 struct ifinfomsg *ifm;
318 struct nlmsghdr *nlh;
319
320 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
321 if (nlh == NULL)
322 return -EMSGSIZE;
323
324 ifm = nlmsg_data(nlh);
325 ifm->ifi_family = AF_UNSPEC;
326 ifm->__ifi_pad = 0;
327 ifm->ifi_type = dev->type;
328 ifm->ifi_index = dev->ifindex;
329 ifm->ifi_flags = dev_get_flags(dev);
330 ifm->ifi_change = change;
331
332 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
333 NLA_PUT_U32(skb, IFLA_TXQLEN, dev->tx_queue_len);
334 NLA_PUT_U32(skb, IFLA_WEIGHT, dev->weight);
335 NLA_PUT_U8(skb, IFLA_OPERSTATE,
336 netif_running(dev) ? dev->operstate : IF_OPER_DOWN);
337 NLA_PUT_U8(skb, IFLA_LINKMODE, dev->link_mode);
338 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
339
340 if (dev->ifindex != dev->iflink)
341 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
342
343 if (dev->master)
344 NLA_PUT_U32(skb, IFLA_MASTER, dev->master->ifindex);
345
346 if (dev->qdisc_sleeping)
347 NLA_PUT_STRING(skb, IFLA_QDISC, dev->qdisc_sleeping->ops->id);
348
349 if (1) {
350 struct rtnl_link_ifmap map = {
351 .mem_start = dev->mem_start,
352 .mem_end = dev->mem_end,
353 .base_addr = dev->base_addr,
354 .irq = dev->irq,
355 .dma = dev->dma,
356 .port = dev->if_port,
357 };
358 NLA_PUT(skb, IFLA_MAP, sizeof(map), &map);
359 }
360
361 if (dev->addr_len) {
362 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
363 NLA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast);
364 }
365
366 if (dev->get_stats) {
367 struct net_device_stats *stats = dev->get_stats(dev);
368 if (stats) {
369 struct nlattr *attr;
370
371 attr = nla_reserve(skb, IFLA_STATS,
372 sizeof(struct rtnl_link_stats));
373 if (attr == NULL)
374 goto nla_put_failure;
375
376 copy_rtnl_link_stats(nla_data(attr), stats);
377 }
378 }
379
380 if (iwbuf)
381 NLA_PUT(skb, IFLA_WIRELESS, iwbuflen, iwbuf);
382
383 return nlmsg_end(skb, nlh);
384
385 nla_put_failure:
386 nlmsg_cancel(skb, nlh);
387 return -EMSGSIZE;
388 }
389
390 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
391 {
392 int idx;
393 int s_idx = cb->args[0];
394 struct net_device *dev;
395
396 read_lock(&dev_base_lock);
397 for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) {
398 if (idx < s_idx)
399 continue;
400 if (rtnl_fill_ifinfo(skb, dev, NULL, 0, RTM_NEWLINK,
401 NETLINK_CB(cb->skb).pid,
402 cb->nlh->nlmsg_seq, 0, NLM_F_MULTI) <= 0)
403 break;
404 }
405 read_unlock(&dev_base_lock);
406 cb->args[0] = idx;
407
408 return skb->len;
409 }
410
411 static struct nla_policy ifla_policy[IFLA_MAX+1] __read_mostly = {
412 [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 },
413 [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) },
414 [IFLA_MTU] = { .type = NLA_U32 },
415 [IFLA_TXQLEN] = { .type = NLA_U32 },
416 [IFLA_WEIGHT] = { .type = NLA_U32 },
417 [IFLA_OPERSTATE] = { .type = NLA_U8 },
418 [IFLA_LINKMODE] = { .type = NLA_U8 },
419 };
420
421 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
422 {
423 struct ifinfomsg *ifm;
424 struct net_device *dev;
425 int err, send_addr_notify = 0, modified = 0;
426 struct nlattr *tb[IFLA_MAX+1];
427 char ifname[IFNAMSIZ];
428
429 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
430 if (err < 0)
431 goto errout;
432
433 if (tb[IFLA_IFNAME])
434 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
435 else
436 ifname[0] = '\0';
437
438 err = -EINVAL;
439 ifm = nlmsg_data(nlh);
440 if (ifm->ifi_index >= 0)
441 dev = dev_get_by_index(ifm->ifi_index);
442 else if (tb[IFLA_IFNAME])
443 dev = dev_get_by_name(ifname);
444 else
445 goto errout;
446
447 if (dev == NULL) {
448 err = -ENODEV;
449 goto errout;
450 }
451
452 if (tb[IFLA_ADDRESS] &&
453 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
454 goto errout_dev;
455
456 if (tb[IFLA_BROADCAST] &&
457 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
458 goto errout_dev;
459
460 if (tb[IFLA_MAP]) {
461 struct rtnl_link_ifmap *u_map;
462 struct ifmap k_map;
463
464 if (!dev->set_config) {
465 err = -EOPNOTSUPP;
466 goto errout_dev;
467 }
468
469 if (!netif_device_present(dev)) {
470 err = -ENODEV;
471 goto errout_dev;
472 }
473
474 u_map = nla_data(tb[IFLA_MAP]);
475 k_map.mem_start = (unsigned long) u_map->mem_start;
476 k_map.mem_end = (unsigned long) u_map->mem_end;
477 k_map.base_addr = (unsigned short) u_map->base_addr;
478 k_map.irq = (unsigned char) u_map->irq;
479 k_map.dma = (unsigned char) u_map->dma;
480 k_map.port = (unsigned char) u_map->port;
481
482 err = dev->set_config(dev, &k_map);
483 if (err < 0)
484 goto errout_dev;
485
486 modified = 1;
487 }
488
489 if (tb[IFLA_ADDRESS]) {
490 struct sockaddr *sa;
491 int len;
492
493 if (!dev->set_mac_address) {
494 err = -EOPNOTSUPP;
495 goto errout_dev;
496 }
497
498 if (!netif_device_present(dev)) {
499 err = -ENODEV;
500 goto errout_dev;
501 }
502
503 len = sizeof(sa_family_t) + dev->addr_len;
504 sa = kmalloc(len, GFP_KERNEL);
505 if (!sa) {
506 err = -ENOMEM;
507 goto errout_dev;
508 }
509 sa->sa_family = dev->type;
510 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
511 dev->addr_len);
512 err = dev->set_mac_address(dev, sa);
513 kfree(sa);
514 if (err)
515 goto errout_dev;
516 send_addr_notify = 1;
517 modified = 1;
518 }
519
520 if (tb[IFLA_MTU]) {
521 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
522 if (err < 0)
523 goto errout_dev;
524 modified = 1;
525 }
526
527 /*
528 * Interface selected by interface index but interface
529 * name provided implies that a name change has been
530 * requested.
531 */
532 if (ifm->ifi_index >= 0 && ifname[0]) {
533 err = dev_change_name(dev, ifname);
534 if (err < 0)
535 goto errout_dev;
536 modified = 1;
537 }
538
539 #ifdef CONFIG_NET_WIRELESS_RTNETLINK
540 if (tb[IFLA_WIRELESS]) {
541 /* Call Wireless Extensions.
542 * Various stuff checked in there... */
543 err = wireless_rtnetlink_set(dev, nla_data(tb[IFLA_WIRELESS]),
544 nla_len(tb[IFLA_WIRELESS]));
545 if (err < 0)
546 goto errout_dev;
547 }
548 #endif /* CONFIG_NET_WIRELESS_RTNETLINK */
549
550 if (tb[IFLA_BROADCAST]) {
551 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
552 send_addr_notify = 1;
553 }
554
555
556 if (ifm->ifi_flags)
557 dev_change_flags(dev, ifm->ifi_flags);
558
559 if (tb[IFLA_TXQLEN])
560 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
561
562 if (tb[IFLA_WEIGHT])
563 dev->weight = nla_get_u32(tb[IFLA_WEIGHT]);
564
565 if (tb[IFLA_OPERSTATE])
566 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
567
568 if (tb[IFLA_LINKMODE]) {
569 write_lock_bh(&dev_base_lock);
570 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
571 write_unlock_bh(&dev_base_lock);
572 }
573
574 err = 0;
575
576 errout_dev:
577 if (err < 0 && modified && net_ratelimit())
578 printk(KERN_WARNING "A link change request failed with "
579 "some changes comitted already. Interface %s may "
580 "have been left with an inconsistent configuration, "
581 "please check.\n", dev->name);
582
583 if (send_addr_notify)
584 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
585
586 dev_put(dev);
587 errout:
588 return err;
589 }
590
591 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
592 {
593 struct ifinfomsg *ifm;
594 struct nlattr *tb[IFLA_MAX+1];
595 struct net_device *dev = NULL;
596 struct sk_buff *nskb;
597 char *iw_buf = NULL, *iw = NULL;
598 int iw_buf_len = 0;
599 int err;
600
601 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
602 if (err < 0)
603 return err;
604
605 ifm = nlmsg_data(nlh);
606 if (ifm->ifi_index >= 0) {
607 dev = dev_get_by_index(ifm->ifi_index);
608 if (dev == NULL)
609 return -ENODEV;
610 } else
611 return -EINVAL;
612
613
614 #ifdef CONFIG_NET_WIRELESS_RTNETLINK
615 if (tb[IFLA_WIRELESS]) {
616 /* Call Wireless Extensions. We need to know the size before
617 * we can alloc. Various stuff checked in there... */
618 err = wireless_rtnetlink_get(dev, nla_data(tb[IFLA_WIRELESS]),
619 nla_len(tb[IFLA_WIRELESS]),
620 &iw_buf, &iw_buf_len);
621 if (err < 0)
622 goto errout;
623
624 iw += IW_EV_POINT_OFF;
625 }
626 #endif /* CONFIG_NET_WIRELESS_RTNETLINK */
627
628 nskb = nlmsg_new(if_nlmsg_size(iw_buf_len), GFP_KERNEL);
629 if (nskb == NULL) {
630 err = -ENOBUFS;
631 goto errout;
632 }
633
634 err = rtnl_fill_ifinfo(nskb, dev, iw, iw_buf_len, RTM_NEWLINK,
635 NETLINK_CB(skb).pid, nlh->nlmsg_seq, 0, 0);
636 if (err < 0) {
637 /* -EMSGSIZE implies BUG in if_nlmsg_size */
638 WARN_ON(err == -EMSGSIZE);
639 kfree_skb(nskb);
640 goto errout;
641 }
642 err = rtnl_unicast(nskb, NETLINK_CB(skb).pid);
643 errout:
644 kfree(iw_buf);
645 dev_put(dev);
646
647 return err;
648 }
649
650 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
651 {
652 int idx;
653 int s_idx = cb->family;
654
655 if (s_idx == 0)
656 s_idx = 1;
657 for (idx=1; idx<NPROTO; idx++) {
658 int type = cb->nlh->nlmsg_type-RTM_BASE;
659 if (idx < s_idx || idx == PF_PACKET)
660 continue;
661 if (rtnetlink_links[idx] == NULL ||
662 rtnetlink_links[idx][type].dumpit == NULL)
663 continue;
664 if (idx > s_idx)
665 memset(&cb->args[0], 0, sizeof(cb->args));
666 if (rtnetlink_links[idx][type].dumpit(skb, cb))
667 break;
668 }
669 cb->family = idx;
670
671 return skb->len;
672 }
673
674 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change)
675 {
676 struct sk_buff *skb;
677 int err = -ENOBUFS;
678
679 skb = nlmsg_new(if_nlmsg_size(0), GFP_KERNEL);
680 if (skb == NULL)
681 goto errout;
682
683 err = rtnl_fill_ifinfo(skb, dev, NULL, 0, type, 0, 0, change, 0);
684 if (err < 0) {
685 /* -EMSGSIZE implies BUG in if_nlmsg_size() */
686 WARN_ON(err == -EMSGSIZE);
687 kfree_skb(skb);
688 goto errout;
689 }
690 err = rtnl_notify(skb, 0, RTNLGRP_LINK, NULL, GFP_KERNEL);
691 errout:
692 if (err < 0)
693 rtnl_set_sk_err(RTNLGRP_LINK, err);
694 }
695
696 /* Protected by RTNL sempahore. */
697 static struct rtattr **rta_buf;
698 static int rtattr_max;
699
700 /* Process one rtnetlink message. */
701
702 static __inline__ int
703 rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, int *errp)
704 {
705 struct rtnetlink_link *link;
706 struct rtnetlink_link *link_tab;
707 int sz_idx, kind;
708 int min_len;
709 int family;
710 int type;
711 int err;
712
713 /* Only requests are handled by kernel now */
714 if (!(nlh->nlmsg_flags&NLM_F_REQUEST))
715 return 0;
716
717 type = nlh->nlmsg_type;
718
719 /* A control message: ignore them */
720 if (type < RTM_BASE)
721 return 0;
722
723 /* Unknown message: reply with EINVAL */
724 if (type > RTM_MAX)
725 goto err_inval;
726
727 type -= RTM_BASE;
728
729 /* All the messages must have at least 1 byte length */
730 if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg)))
731 return 0;
732
733 family = ((struct rtgenmsg*)NLMSG_DATA(nlh))->rtgen_family;
734 if (family >= NPROTO) {
735 *errp = -EAFNOSUPPORT;
736 return -1;
737 }
738
739 link_tab = rtnetlink_links[family];
740 if (link_tab == NULL)
741 link_tab = rtnetlink_links[PF_UNSPEC];
742 link = &link_tab[type];
743
744 sz_idx = type>>2;
745 kind = type&3;
746
747 if (kind != 2 && security_netlink_recv(skb, CAP_NET_ADMIN)) {
748 *errp = -EPERM;
749 return -1;
750 }
751
752 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
753 if (link->dumpit == NULL)
754 link = &(rtnetlink_links[PF_UNSPEC][type]);
755
756 if (link->dumpit == NULL)
757 goto err_inval;
758
759 if ((*errp = netlink_dump_start(rtnl, skb, nlh,
760 link->dumpit, NULL)) != 0) {
761 return -1;
762 }
763
764 netlink_queue_skip(nlh, skb);
765 return -1;
766 }
767
768 memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *)));
769
770 min_len = rtm_min[sz_idx];
771 if (nlh->nlmsg_len < min_len)
772 goto err_inval;
773
774 if (nlh->nlmsg_len > min_len) {
775 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
776 struct rtattr *attr = (void*)nlh + NLMSG_ALIGN(min_len);
777
778 while (RTA_OK(attr, attrlen)) {
779 unsigned flavor = attr->rta_type;
780 if (flavor) {
781 if (flavor > rta_max[sz_idx])
782 goto err_inval;
783 rta_buf[flavor-1] = attr;
784 }
785 attr = RTA_NEXT(attr, attrlen);
786 }
787 }
788
789 if (link->doit == NULL)
790 link = &(rtnetlink_links[PF_UNSPEC][type]);
791 if (link->doit == NULL)
792 goto err_inval;
793 err = link->doit(skb, nlh, (void *)&rta_buf[0]);
794
795 *errp = err;
796 return err;
797
798 err_inval:
799 *errp = -EINVAL;
800 return -1;
801 }
802
803 static void rtnetlink_rcv(struct sock *sk, int len)
804 {
805 unsigned int qlen = 0;
806
807 do {
808 mutex_lock(&rtnl_mutex);
809 netlink_run_queue(sk, &qlen, &rtnetlink_rcv_msg);
810 mutex_unlock(&rtnl_mutex);
811
812 netdev_run_todo();
813 } while (qlen);
814 }
815
816 static struct rtnetlink_link link_rtnetlink_table[RTM_NR_MSGTYPES] =
817 {
818 [RTM_GETLINK - RTM_BASE] = { .doit = rtnl_getlink,
819 .dumpit = rtnl_dump_ifinfo },
820 [RTM_SETLINK - RTM_BASE] = { .doit = rtnl_setlink },
821 [RTM_GETADDR - RTM_BASE] = { .dumpit = rtnl_dump_all },
822 [RTM_GETROUTE - RTM_BASE] = { .dumpit = rtnl_dump_all },
823 [RTM_NEWNEIGH - RTM_BASE] = { .doit = neigh_add },
824 [RTM_DELNEIGH - RTM_BASE] = { .doit = neigh_delete },
825 [RTM_GETNEIGH - RTM_BASE] = { .dumpit = neigh_dump_info },
826 #ifdef CONFIG_FIB_RULES
827 [RTM_NEWRULE - RTM_BASE] = { .doit = fib_nl_newrule },
828 [RTM_DELRULE - RTM_BASE] = { .doit = fib_nl_delrule },
829 #endif
830 [RTM_GETRULE - RTM_BASE] = { .dumpit = rtnl_dump_all },
831 [RTM_GETNEIGHTBL - RTM_BASE] = { .dumpit = neightbl_dump_info },
832 [RTM_SETNEIGHTBL - RTM_BASE] = { .doit = neightbl_set },
833 };
834
835 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
836 {
837 struct net_device *dev = ptr;
838 switch (event) {
839 case NETDEV_UNREGISTER:
840 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);
841 break;
842 case NETDEV_REGISTER:
843 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
844 break;
845 case NETDEV_UP:
846 case NETDEV_DOWN:
847 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
848 break;
849 case NETDEV_CHANGE:
850 case NETDEV_GOING_DOWN:
851 break;
852 default:
853 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
854 break;
855 }
856 return NOTIFY_DONE;
857 }
858
859 static struct notifier_block rtnetlink_dev_notifier = {
860 .notifier_call = rtnetlink_event,
861 };
862
863 void __init rtnetlink_init(void)
864 {
865 int i;
866
867 rtattr_max = 0;
868 for (i = 0; i < ARRAY_SIZE(rta_max); i++)
869 if (rta_max[i] > rtattr_max)
870 rtattr_max = rta_max[i];
871 rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL);
872 if (!rta_buf)
873 panic("rtnetlink_init: cannot allocate rta_buf\n");
874
875 rtnl = netlink_kernel_create(NETLINK_ROUTE, RTNLGRP_MAX, rtnetlink_rcv,
876 THIS_MODULE);
877 if (rtnl == NULL)
878 panic("rtnetlink_init: cannot initialize rtnetlink\n");
879 netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV);
880 register_netdevice_notifier(&rtnetlink_dev_notifier);
881 rtnetlink_links[PF_UNSPEC] = link_rtnetlink_table;
882 rtnetlink_links[PF_PACKET] = link_rtnetlink_table;
883 }
884
885 EXPORT_SYMBOL(__rta_fill);
886 EXPORT_SYMBOL(rtattr_strlcpy);
887 EXPORT_SYMBOL(rtattr_parse);
888 EXPORT_SYMBOL(rtnetlink_links);
889 EXPORT_SYMBOL(rtnetlink_put_metrics);
890 EXPORT_SYMBOL(rtnl_lock);
891 EXPORT_SYMBOL(rtnl_trylock);
892 EXPORT_SYMBOL(rtnl_unlock);
893 EXPORT_SYMBOL(rtnl_unicast);
894 EXPORT_SYMBOL(rtnl_notify);
895 EXPORT_SYMBOL(rtnl_set_sk_err);
Log-structured file system for Linux