Merge branch 'for-2.6.21' of master.kernel.org:/pub/scm/linux/kernel/git/davej/agpgart
[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/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                 /* Payload is at an offset in buffer */
625                 iw = iw_buf + IW_EV_POINT_OFF;
626         }
627 #endif  /* CONFIG_NET_WIRELESS_RTNETLINK */
628
629         nskb = nlmsg_new(if_nlmsg_size(iw_buf_len), GFP_KERNEL);
630         if (nskb == NULL) {
631                 err = -ENOBUFS;
632                 goto errout;
633         }
634
635         err = rtnl_fill_ifinfo(nskb, dev, iw, iw_buf_len, RTM_NEWLINK,
636                                NETLINK_CB(skb).pid, nlh->nlmsg_seq, 0, 0);
637         if (err < 0) {
638                 /* -EMSGSIZE implies BUG in if_nlmsg_size */
639                 WARN_ON(err == -EMSGSIZE);
640                 kfree_skb(nskb);
641                 goto errout;
642         }
643         err = rtnl_unicast(nskb, NETLINK_CB(skb).pid);
644 errout:
645         kfree(iw_buf);
646         dev_put(dev);
647
648         return err;
649 }
650
651 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
652 {
653         int idx;
654         int s_idx = cb->family;
655
656         if (s_idx == 0)
657                 s_idx = 1;
658         for (idx=1; idx<NPROTO; idx++) {
659                 int type = cb->nlh->nlmsg_type-RTM_BASE;
660                 if (idx < s_idx || idx == PF_PACKET)
661                         continue;
662                 if (rtnetlink_links[idx] == NULL ||
663                     rtnetlink_links[idx][type].dumpit == NULL)
664                         continue;
665                 if (idx > s_idx)
666                         memset(&cb->args[0], 0, sizeof(cb->args));
667                 if (rtnetlink_links[idx][type].dumpit(skb, cb))
668                         break;
669         }
670         cb->family = idx;
671
672         return skb->len;
673 }
674
675 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change)
676 {
677         struct sk_buff *skb;
678         int err = -ENOBUFS;
679
680         skb = nlmsg_new(if_nlmsg_size(0), GFP_KERNEL);
681         if (skb == NULL)
682                 goto errout;
683
684         err = rtnl_fill_ifinfo(skb, dev, NULL, 0, type, 0, 0, change, 0);
685         if (err < 0) {
686                 /* -EMSGSIZE implies BUG in if_nlmsg_size() */
687                 WARN_ON(err == -EMSGSIZE);
688                 kfree_skb(skb);
689                 goto errout;
690         }
691         err = rtnl_notify(skb, 0, RTNLGRP_LINK, NULL, GFP_KERNEL);
692 errout:
693         if (err < 0)
694                 rtnl_set_sk_err(RTNLGRP_LINK, err);
695 }
696
697 /* Protected by RTNL sempahore.  */
698 static struct rtattr **rta_buf;
699 static int rtattr_max;
700
701 /* Process one rtnetlink message. */
702
703 static __inline__ int
704 rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, int *errp)
705 {
706         struct rtnetlink_link *link;
707         struct rtnetlink_link *link_tab;
708         int sz_idx, kind;
709         int min_len;
710         int family;
711         int type;
712         int err;
713
714         /* Only requests are handled by kernel now */
715         if (!(nlh->nlmsg_flags&NLM_F_REQUEST))
716                 return 0;
717
718         type = nlh->nlmsg_type;
719
720         /* A control message: ignore them */
721         if (type < RTM_BASE)
722                 return 0;
723
724         /* Unknown message: reply with EINVAL */
725         if (type > RTM_MAX)
726                 goto err_inval;
727
728         type -= RTM_BASE;
729
730         /* All the messages must have at least 1 byte length */
731         if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg)))
732                 return 0;
733
734         family = ((struct rtgenmsg*)NLMSG_DATA(nlh))->rtgen_family;
735         if (family >= NPROTO) {
736                 *errp = -EAFNOSUPPORT;
737                 return -1;
738         }
739
740         link_tab = rtnetlink_links[family];
741         if (link_tab == NULL)
742                 link_tab = rtnetlink_links[PF_UNSPEC];
743         link = &link_tab[type];
744
745         sz_idx = type>>2;
746         kind = type&3;
747
748         if (kind != 2 && security_netlink_recv(skb, CAP_NET_ADMIN)) {
749                 *errp = -EPERM;
750                 return -1;
751         }
752
753         if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
754                 if (link->dumpit == NULL)
755                         link = &(rtnetlink_links[PF_UNSPEC][type]);
756
757                 if (link->dumpit == NULL)
758                         goto err_inval;
759
760                 if ((*errp = netlink_dump_start(rtnl, skb, nlh,
761                                                 link->dumpit, NULL)) != 0) {
762                         return -1;
763                 }
764
765                 netlink_queue_skip(nlh, skb);
766                 return -1;
767         }
768
769         memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *)));
770
771         min_len = rtm_min[sz_idx];
772         if (nlh->nlmsg_len < min_len)
773                 goto err_inval;
774
775         if (nlh->nlmsg_len > min_len) {
776                 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
777                 struct rtattr *attr = (void*)nlh + NLMSG_ALIGN(min_len);
778
779                 while (RTA_OK(attr, attrlen)) {
780                         unsigned flavor = attr->rta_type;
781                         if (flavor) {
782                                 if (flavor > rta_max[sz_idx])
783                                         goto err_inval;
784                                 rta_buf[flavor-1] = attr;
785                         }
786                         attr = RTA_NEXT(attr, attrlen);
787                 }
788         }
789
790         if (link->doit == NULL)
791                 link = &(rtnetlink_links[PF_UNSPEC][type]);
792         if (link->doit == NULL)
793                 goto err_inval;
794         err = link->doit(skb, nlh, (void *)&rta_buf[0]);
795
796         *errp = err;
797         return err;
798
799 err_inval:
800         *errp = -EINVAL;
801         return -1;
802 }
803
804 static void rtnetlink_rcv(struct sock *sk, int len)
805 {
806         unsigned int qlen = 0;
807
808         do {
809                 mutex_lock(&rtnl_mutex);
810                 netlink_run_queue(sk, &qlen, &rtnetlink_rcv_msg);
811                 mutex_unlock(&rtnl_mutex);
812
813                 netdev_run_todo();
814         } while (qlen);
815 }
816
817 static struct rtnetlink_link link_rtnetlink_table[RTM_NR_MSGTYPES] =
818 {
819         [RTM_GETLINK     - RTM_BASE] = { .doit   = rtnl_getlink,
820                                          .dumpit = rtnl_dump_ifinfo      },
821         [RTM_SETLINK     - RTM_BASE] = { .doit   = rtnl_setlink          },
822         [RTM_GETADDR     - RTM_BASE] = { .dumpit = rtnl_dump_all         },
823         [RTM_GETROUTE    - RTM_BASE] = { .dumpit = rtnl_dump_all         },
824         [RTM_NEWNEIGH    - RTM_BASE] = { .doit   = neigh_add             },
825         [RTM_DELNEIGH    - RTM_BASE] = { .doit   = neigh_delete          },
826         [RTM_GETNEIGH    - RTM_BASE] = { .dumpit = neigh_dump_info       },
827 #ifdef CONFIG_FIB_RULES
828         [RTM_NEWRULE     - RTM_BASE] = { .doit   = fib_nl_newrule        },
829         [RTM_DELRULE     - RTM_BASE] = { .doit   = fib_nl_delrule        },
830 #endif
831         [RTM_GETRULE     - RTM_BASE] = { .dumpit = rtnl_dump_all         },
832         [RTM_GETNEIGHTBL - RTM_BASE] = { .dumpit = neightbl_dump_info    },
833         [RTM_SETNEIGHTBL - RTM_BASE] = { .doit   = neightbl_set          },
834 };
835
836 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
837 {
838         struct net_device *dev = ptr;
839         switch (event) {
840         case NETDEV_UNREGISTER:
841                 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);
842                 break;
843         case NETDEV_REGISTER:
844                 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
845                 break;
846         case NETDEV_UP:
847         case NETDEV_DOWN:
848                 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
849                 break;
850         case NETDEV_CHANGE:
851         case NETDEV_GOING_DOWN:
852                 break;
853         default:
854                 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
855                 break;
856         }
857         return NOTIFY_DONE;
858 }
859
860 static struct notifier_block rtnetlink_dev_notifier = {
861         .notifier_call  = rtnetlink_event,
862 };
863
864 void __init rtnetlink_init(void)
865 {
866         int i;
867
868         rtattr_max = 0;
869         for (i = 0; i < ARRAY_SIZE(rta_max); i++)
870                 if (rta_max[i] > rtattr_max)
871                         rtattr_max = rta_max[i];
872         rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL);
873         if (!rta_buf)
874                 panic("rtnetlink_init: cannot allocate rta_buf\n");
875
876         rtnl = netlink_kernel_create(NETLINK_ROUTE, RTNLGRP_MAX, rtnetlink_rcv,
877                                      THIS_MODULE);
878         if (rtnl == NULL)
879                 panic("rtnetlink_init: cannot initialize rtnetlink\n");
880         netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV);
881         register_netdevice_notifier(&rtnetlink_dev_notifier);
882         rtnetlink_links[PF_UNSPEC] = link_rtnetlink_table;
883         rtnetlink_links[PF_PACKET] = link_rtnetlink_table;
884 }
885
886 EXPORT_SYMBOL(__rta_fill);
887 EXPORT_SYMBOL(rtattr_strlcpy);
888 EXPORT_SYMBOL(rtattr_parse);
889 EXPORT_SYMBOL(rtnetlink_links);
890 EXPORT_SYMBOL(rtnetlink_put_metrics);
891 EXPORT_SYMBOL(rtnl_lock);
892 EXPORT_SYMBOL(rtnl_trylock);
893 EXPORT_SYMBOL(rtnl_unlock);
894 EXPORT_SYMBOL(rtnl_unicast);
895 EXPORT_SYMBOL(rtnl_notify);
896 EXPORT_SYMBOL(rtnl_set_sk_err);