Pull bugfix into test branch
[linux-2.6] / 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_GETMULTICAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
112         [RTM_FAM(RTM_GETANYCAST)]   = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
113 };
114
115 static const int rta_max[RTM_NR_FAMILIES] =
116 {
117         [RTM_FAM(RTM_NEWLINK)]      = IFLA_MAX,
118         [RTM_FAM(RTM_NEWADDR)]      = IFA_MAX,
119         [RTM_FAM(RTM_NEWROUTE)]     = RTA_MAX,
120         [RTM_FAM(RTM_NEWRULE)]      = FRA_MAX,
121         [RTM_FAM(RTM_NEWQDISC)]     = TCA_MAX,
122         [RTM_FAM(RTM_NEWTCLASS)]    = TCA_MAX,
123         [RTM_FAM(RTM_NEWTFILTER)]   = TCA_MAX,
124         [RTM_FAM(RTM_NEWACTION)]    = TCAA_MAX,
125 };
126
127 void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const void *data)
128 {
129         struct rtattr *rta;
130         int size = RTA_LENGTH(attrlen);
131
132         rta = (struct rtattr*)skb_put(skb, RTA_ALIGN(size));
133         rta->rta_type = attrtype;
134         rta->rta_len = size;
135         memcpy(RTA_DATA(rta), data, attrlen);
136         memset(RTA_DATA(rta) + attrlen, 0, RTA_ALIGN(size) - size);
137 }
138
139 size_t rtattr_strlcpy(char *dest, const struct rtattr *rta, size_t size)
140 {
141         size_t ret = RTA_PAYLOAD(rta);
142         char *src = RTA_DATA(rta);
143
144         if (ret > 0 && src[ret - 1] == '\0')
145                 ret--;
146         if (size > 0) {
147                 size_t len = (ret >= size) ? size - 1 : ret;
148                 memset(dest, 0, size);
149                 memcpy(dest, src, len);
150         }
151         return ret;
152 }
153
154 int rtnetlink_send(struct sk_buff *skb, u32 pid, unsigned group, int echo)
155 {
156         int err = 0;
157
158         NETLINK_CB(skb).dst_group = group;
159         if (echo)
160                 atomic_inc(&skb->users);
161         netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL);
162         if (echo)
163                 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
164         return err;
165 }
166
167 int rtnl_unicast(struct sk_buff *skb, u32 pid)
168 {
169         return nlmsg_unicast(rtnl, skb, pid);
170 }
171
172 int rtnl_notify(struct sk_buff *skb, u32 pid, u32 group,
173                 struct nlmsghdr *nlh, gfp_t flags)
174 {
175         int report = 0;
176
177         if (nlh)
178                 report = nlmsg_report(nlh);
179
180         return nlmsg_notify(rtnl, skb, pid, group, report, flags);
181 }
182
183 void rtnl_set_sk_err(u32 group, int error)
184 {
185         netlink_set_err(rtnl, 0, group, error);
186 }
187
188 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics)
189 {
190         struct nlattr *mx;
191         int i, valid = 0;
192
193         mx = nla_nest_start(skb, RTA_METRICS);
194         if (mx == NULL)
195                 return -ENOBUFS;
196
197         for (i = 0; i < RTAX_MAX; i++) {
198                 if (metrics[i]) {
199                         valid++;
200                         NLA_PUT_U32(skb, i+1, metrics[i]);
201                 }
202         }
203
204         if (!valid) {
205                 nla_nest_cancel(skb, mx);
206                 return 0;
207         }
208
209         return nla_nest_end(skb, mx);
210
211 nla_put_failure:
212         return nla_nest_cancel(skb, mx);
213 }
214
215 int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id,
216                        u32 ts, u32 tsage, long expires, u32 error)
217 {
218         struct rta_cacheinfo ci = {
219                 .rta_lastuse = jiffies_to_clock_t(jiffies - dst->lastuse),
220                 .rta_used = dst->__use,
221                 .rta_clntref = atomic_read(&(dst->__refcnt)),
222                 .rta_error = error,
223                 .rta_id =  id,
224                 .rta_ts = ts,
225                 .rta_tsage = tsage,
226         };
227
228         if (expires)
229                 ci.rta_expires = jiffies_to_clock_t(expires);
230
231         return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci);
232 }
233
234 EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo);
235
236 static void set_operstate(struct net_device *dev, unsigned char transition)
237 {
238         unsigned char operstate = dev->operstate;
239
240         switch(transition) {
241         case IF_OPER_UP:
242                 if ((operstate == IF_OPER_DORMANT ||
243                      operstate == IF_OPER_UNKNOWN) &&
244                     !netif_dormant(dev))
245                         operstate = IF_OPER_UP;
246                 break;
247
248         case IF_OPER_DORMANT:
249                 if (operstate == IF_OPER_UP ||
250                     operstate == IF_OPER_UNKNOWN)
251                         operstate = IF_OPER_DORMANT;
252                 break;
253         };
254
255         if (dev->operstate != operstate) {
256                 write_lock_bh(&dev_base_lock);
257                 dev->operstate = operstate;
258                 write_unlock_bh(&dev_base_lock);
259                 netdev_state_change(dev);
260         }
261 }
262
263 static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
264                                  struct net_device_stats *b)
265 {
266         a->rx_packets = b->rx_packets;
267         a->tx_packets = b->tx_packets;
268         a->rx_bytes = b->rx_bytes;
269         a->tx_bytes = b->tx_bytes;
270         a->rx_errors = b->rx_errors;
271         a->tx_errors = b->tx_errors;
272         a->rx_dropped = b->rx_dropped;
273         a->tx_dropped = b->tx_dropped;
274
275         a->multicast = b->multicast;
276         a->collisions = b->collisions;
277
278         a->rx_length_errors = b->rx_length_errors;
279         a->rx_over_errors = b->rx_over_errors;
280         a->rx_crc_errors = b->rx_crc_errors;
281         a->rx_frame_errors = b->rx_frame_errors;
282         a->rx_fifo_errors = b->rx_fifo_errors;
283         a->rx_missed_errors = b->rx_missed_errors;
284
285         a->tx_aborted_errors = b->tx_aborted_errors;
286         a->tx_carrier_errors = b->tx_carrier_errors;
287         a->tx_fifo_errors = b->tx_fifo_errors;
288         a->tx_heartbeat_errors = b->tx_heartbeat_errors;
289         a->tx_window_errors = b->tx_window_errors;
290
291         a->rx_compressed = b->rx_compressed;
292         a->tx_compressed = b->tx_compressed;
293 };
294
295 static inline size_t if_nlmsg_size(int iwbuflen)
296 {
297         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
298                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
299                + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */
300                + nla_total_size(sizeof(struct rtnl_link_ifmap))
301                + nla_total_size(sizeof(struct rtnl_link_stats))
302                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
303                + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */
304                + nla_total_size(4) /* IFLA_TXQLEN */
305                + nla_total_size(4) /* IFLA_WEIGHT */
306                + nla_total_size(4) /* IFLA_MTU */
307                + nla_total_size(4) /* IFLA_LINK */
308                + nla_total_size(4) /* IFLA_MASTER */
309                + nla_total_size(1) /* IFLA_OPERSTATE */
310                + nla_total_size(1) /* IFLA_LINKMODE */
311                + nla_total_size(iwbuflen);
312 }
313
314 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
315                             void *iwbuf, int iwbuflen, int type, u32 pid,
316                             u32 seq, u32 change, unsigned int flags)
317 {
318         struct ifinfomsg *ifm;
319         struct nlmsghdr *nlh;
320
321         nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
322         if (nlh == NULL)
323                 return -ENOBUFS;
324
325         ifm = nlmsg_data(nlh);
326         ifm->ifi_family = AF_UNSPEC;
327         ifm->__ifi_pad = 0;
328         ifm->ifi_type = dev->type;
329         ifm->ifi_index = dev->ifindex;
330         ifm->ifi_flags = dev_get_flags(dev);
331         ifm->ifi_change = change;
332
333         NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
334         NLA_PUT_U32(skb, IFLA_TXQLEN, dev->tx_queue_len);
335         NLA_PUT_U32(skb, IFLA_WEIGHT, dev->weight);
336         NLA_PUT_U8(skb, IFLA_OPERSTATE,
337                    netif_running(dev) ? dev->operstate : IF_OPER_DOWN);
338         NLA_PUT_U8(skb, IFLA_LINKMODE, dev->link_mode);
339         NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
340
341         if (dev->ifindex != dev->iflink)
342                 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
343
344         if (dev->master)
345                 NLA_PUT_U32(skb, IFLA_MASTER, dev->master->ifindex);
346
347         if (dev->qdisc_sleeping)
348                 NLA_PUT_STRING(skb, IFLA_QDISC, dev->qdisc_sleeping->ops->id);
349
350         if (1) {
351                 struct rtnl_link_ifmap map = {
352                         .mem_start   = dev->mem_start,
353                         .mem_end     = dev->mem_end,
354                         .base_addr   = dev->base_addr,
355                         .irq         = dev->irq,
356                         .dma         = dev->dma,
357                         .port        = dev->if_port,
358                 };
359                 NLA_PUT(skb, IFLA_MAP, sizeof(map), &map);
360         }
361
362         if (dev->addr_len) {
363                 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
364                 NLA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast);
365         }
366
367         if (dev->get_stats) {
368                 struct net_device_stats *stats = dev->get_stats(dev);
369                 if (stats) {
370                         struct nlattr *attr;
371
372                         attr = nla_reserve(skb, IFLA_STATS,
373                                            sizeof(struct rtnl_link_stats));
374                         if (attr == NULL)
375                                 goto nla_put_failure;
376
377                         copy_rtnl_link_stats(nla_data(attr), stats);
378                 }
379         }
380
381         if (iwbuf)
382                 NLA_PUT(skb, IFLA_WIRELESS, iwbuflen, iwbuf);
383
384         return nlmsg_end(skb, nlh);
385
386 nla_put_failure:
387         return nlmsg_cancel(skb, nlh);
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         /* failure impilies BUG in if_nlmsg_size or wireless_rtnetlink_get */
637         BUG_ON(err < 0);
638
639         err = rtnl_unicast(nskb, NETLINK_CB(skb).pid);
640 errout:
641         kfree(iw_buf);
642         dev_put(dev);
643
644         return err;
645 }
646
647 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
648 {
649         int idx;
650         int s_idx = cb->family;
651
652         if (s_idx == 0)
653                 s_idx = 1;
654         for (idx=1; idx<NPROTO; idx++) {
655                 int type = cb->nlh->nlmsg_type-RTM_BASE;
656                 if (idx < s_idx || idx == PF_PACKET)
657                         continue;
658                 if (rtnetlink_links[idx] == NULL ||
659                     rtnetlink_links[idx][type].dumpit == NULL)
660                         continue;
661                 if (idx > s_idx)
662                         memset(&cb->args[0], 0, sizeof(cb->args));
663                 if (rtnetlink_links[idx][type].dumpit(skb, cb))
664                         break;
665         }
666         cb->family = idx;
667
668         return skb->len;
669 }
670
671 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change)
672 {
673         struct sk_buff *skb;
674         int err = -ENOBUFS;
675
676         skb = nlmsg_new(if_nlmsg_size(0), GFP_KERNEL);
677         if (skb == NULL)
678                 goto errout;
679
680         err = rtnl_fill_ifinfo(skb, dev, NULL, 0, type, 0, 0, change, 0);
681         /* failure implies BUG in if_nlmsg_size() */
682         BUG_ON(err < 0);
683
684         err = rtnl_notify(skb, 0, RTNLGRP_LINK, NULL, GFP_KERNEL);
685 errout:
686         if (err < 0)
687                 rtnl_set_sk_err(RTNLGRP_LINK, err);
688 }
689
690 /* Protected by RTNL sempahore.  */
691 static struct rtattr **rta_buf;
692 static int rtattr_max;
693
694 /* Process one rtnetlink message. */
695
696 static __inline__ int
697 rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, int *errp)
698 {
699         struct rtnetlink_link *link;
700         struct rtnetlink_link *link_tab;
701         int sz_idx, kind;
702         int min_len;
703         int family;
704         int type;
705         int err;
706
707         /* Only requests are handled by kernel now */
708         if (!(nlh->nlmsg_flags&NLM_F_REQUEST))
709                 return 0;
710
711         type = nlh->nlmsg_type;
712
713         /* A control message: ignore them */
714         if (type < RTM_BASE)
715                 return 0;
716
717         /* Unknown message: reply with EINVAL */
718         if (type > RTM_MAX)
719                 goto err_inval;
720
721         type -= RTM_BASE;
722
723         /* All the messages must have at least 1 byte length */
724         if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg)))
725                 return 0;
726
727         family = ((struct rtgenmsg*)NLMSG_DATA(nlh))->rtgen_family;
728         if (family >= NPROTO) {
729                 *errp = -EAFNOSUPPORT;
730                 return -1;
731         }
732
733         link_tab = rtnetlink_links[family];
734         if (link_tab == NULL)
735                 link_tab = rtnetlink_links[PF_UNSPEC];
736         link = &link_tab[type];
737
738         sz_idx = type>>2;
739         kind = type&3;
740
741         if (kind != 2 && security_netlink_recv(skb, CAP_NET_ADMIN)) {
742                 *errp = -EPERM;
743                 return -1;
744         }
745
746         if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
747                 if (link->dumpit == NULL)
748                         link = &(rtnetlink_links[PF_UNSPEC][type]);
749
750                 if (link->dumpit == NULL)
751                         goto err_inval;
752
753                 if ((*errp = netlink_dump_start(rtnl, skb, nlh,
754                                                 link->dumpit, NULL)) != 0) {
755                         return -1;
756                 }
757
758                 netlink_queue_skip(nlh, skb);
759                 return -1;
760         }
761
762         memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *)));
763
764         min_len = rtm_min[sz_idx];
765         if (nlh->nlmsg_len < min_len)
766                 goto err_inval;
767
768         if (nlh->nlmsg_len > min_len) {
769                 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
770                 struct rtattr *attr = (void*)nlh + NLMSG_ALIGN(min_len);
771
772                 while (RTA_OK(attr, attrlen)) {
773                         unsigned flavor = attr->rta_type;
774                         if (flavor) {
775                                 if (flavor > rta_max[sz_idx])
776                                         goto err_inval;
777                                 rta_buf[flavor-1] = attr;
778                         }
779                         attr = RTA_NEXT(attr, attrlen);
780                 }
781         }
782
783         if (link->doit == NULL)
784                 link = &(rtnetlink_links[PF_UNSPEC][type]);
785         if (link->doit == NULL)
786                 goto err_inval;
787         err = link->doit(skb, nlh, (void *)&rta_buf[0]);
788
789         *errp = err;
790         return err;
791
792 err_inval:
793         *errp = -EINVAL;
794         return -1;
795 }
796
797 static void rtnetlink_rcv(struct sock *sk, int len)
798 {
799         unsigned int qlen = 0;
800
801         do {
802                 mutex_lock(&rtnl_mutex);
803                 netlink_run_queue(sk, &qlen, &rtnetlink_rcv_msg);
804                 mutex_unlock(&rtnl_mutex);
805
806                 netdev_run_todo();
807         } while (qlen);
808 }
809
810 static struct rtnetlink_link link_rtnetlink_table[RTM_NR_MSGTYPES] =
811 {
812         [RTM_GETLINK     - RTM_BASE] = { .doit   = rtnl_getlink,
813                                          .dumpit = rtnl_dump_ifinfo      },
814         [RTM_SETLINK     - RTM_BASE] = { .doit   = rtnl_setlink          },
815         [RTM_GETADDR     - RTM_BASE] = { .dumpit = rtnl_dump_all         },
816         [RTM_GETROUTE    - RTM_BASE] = { .dumpit = rtnl_dump_all         },
817         [RTM_NEWNEIGH    - RTM_BASE] = { .doit   = neigh_add             },
818         [RTM_DELNEIGH    - RTM_BASE] = { .doit   = neigh_delete          },
819         [RTM_GETNEIGH    - RTM_BASE] = { .dumpit = neigh_dump_info       },
820 #ifdef CONFIG_FIB_RULES
821         [RTM_NEWRULE     - RTM_BASE] = { .doit   = fib_nl_newrule        },
822         [RTM_DELRULE     - RTM_BASE] = { .doit   = fib_nl_delrule        },
823 #endif
824         [RTM_GETRULE     - RTM_BASE] = { .dumpit = rtnl_dump_all         },
825         [RTM_GETNEIGHTBL - RTM_BASE] = { .dumpit = neightbl_dump_info    },
826         [RTM_SETNEIGHTBL - RTM_BASE] = { .doit   = neightbl_set          },
827 };
828
829 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
830 {
831         struct net_device *dev = ptr;
832         switch (event) {
833         case NETDEV_UNREGISTER:
834                 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);
835                 break;
836         case NETDEV_REGISTER:
837                 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
838                 break;
839         case NETDEV_UP:
840         case NETDEV_DOWN:
841                 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
842                 break;
843         case NETDEV_CHANGE:
844         case NETDEV_GOING_DOWN:
845                 break;
846         default:
847                 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
848                 break;
849         }
850         return NOTIFY_DONE;
851 }
852
853 static struct notifier_block rtnetlink_dev_notifier = {
854         .notifier_call  = rtnetlink_event,
855 };
856
857 void __init rtnetlink_init(void)
858 {
859         int i;
860
861         rtattr_max = 0;
862         for (i = 0; i < ARRAY_SIZE(rta_max); i++)
863                 if (rta_max[i] > rtattr_max)
864                         rtattr_max = rta_max[i];
865         rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL);
866         if (!rta_buf)
867                 panic("rtnetlink_init: cannot allocate rta_buf\n");
868
869         rtnl = netlink_kernel_create(NETLINK_ROUTE, RTNLGRP_MAX, rtnetlink_rcv,
870                                      THIS_MODULE);
871         if (rtnl == NULL)
872                 panic("rtnetlink_init: cannot initialize rtnetlink\n");
873         netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV);
874         register_netdevice_notifier(&rtnetlink_dev_notifier);
875         rtnetlink_links[PF_UNSPEC] = link_rtnetlink_table;
876         rtnetlink_links[PF_PACKET] = link_rtnetlink_table;
877 }
878
879 EXPORT_SYMBOL(__rta_fill);
880 EXPORT_SYMBOL(rtattr_strlcpy);
881 EXPORT_SYMBOL(rtattr_parse);
882 EXPORT_SYMBOL(rtnetlink_links);
883 EXPORT_SYMBOL(rtnetlink_put_metrics);
884 EXPORT_SYMBOL(rtnl_lock);
885 EXPORT_SYMBOL(rtnl_trylock);
886 EXPORT_SYMBOL(rtnl_unlock);
887 EXPORT_SYMBOL(rtnl_unicast);
888 EXPORT_SYMBOL(rtnl_notify);
889 EXPORT_SYMBOL(rtnl_set_sk_err);