[NETLINK]: Add properly module refcounting for kernel netlink sockets.
[linux-2.6.git] / net / core / rtnetlink.c
1 /*
2  * INET         An implementation of the TCP/IP protocol suite for the LINUX
3  *              operating system.  INET is implemented using the  BSD Socket
4  *              interface as the means of communication with the user level.
5  *
6  *              Routing netlink socket interface: protocol independent part.
7  *
8  * Authors:     Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
9  *
10  *              This program is free software; you can redistribute it and/or
11  *              modify it under the terms of the GNU General Public License
12  *              as published by the Free Software Foundation; either version
13  *              2 of the License, or (at your option) any later version.
14  *
15  *      Fixes:
16  *      Vitaly E. Lavrov                RTA_OK arithmetics was wrong.
17  */
18
19 #include <linux/config.h>
20 #include <linux/errno.h>
21 #include <linux/module.h>
22 #include <linux/types.h>
23 #include <linux/socket.h>
24 #include <linux/kernel.h>
25 #include <linux/sched.h>
26 #include <linux/timer.h>
27 #include <linux/string.h>
28 #include <linux/sockios.h>
29 #include <linux/net.h>
30 #include <linux/fcntl.h>
31 #include <linux/mm.h>
32 #include <linux/slab.h>
33 #include <linux/interrupt.h>
34 #include <linux/capability.h>
35 #include <linux/skbuff.h>
36 #include <linux/init.h>
37 #include <linux/security.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
53 DECLARE_MUTEX(rtnl_sem);
54
55 void rtnl_lock(void)
56 {
57         rtnl_shlock();
58 }
59
60 int rtnl_lock_interruptible(void)
61 {
62         return down_interruptible(&rtnl_sem);
63 }
64  
65 void rtnl_unlock(void)
66 {
67         rtnl_shunlock();
68
69         netdev_run_todo();
70 }
71
72 int rtattr_parse(struct rtattr *tb[], int maxattr, struct rtattr *rta, int len)
73 {
74         memset(tb, 0, sizeof(struct rtattr*)*maxattr);
75
76         while (RTA_OK(rta, len)) {
77                 unsigned flavor = rta->rta_type;
78                 if (flavor && flavor <= maxattr)
79                         tb[flavor-1] = rta;
80                 rta = RTA_NEXT(rta, len);
81         }
82         return 0;
83 }
84
85 struct sock *rtnl;
86
87 struct rtnetlink_link * rtnetlink_links[NPROTO];
88
89 static const int rtm_min[RTM_NR_FAMILIES] =
90 {
91         [RTM_FAM(RTM_NEWLINK)]      = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
92         [RTM_FAM(RTM_NEWADDR)]      = NLMSG_LENGTH(sizeof(struct ifaddrmsg)),
93         [RTM_FAM(RTM_NEWROUTE)]     = NLMSG_LENGTH(sizeof(struct rtmsg)),
94         [RTM_FAM(RTM_NEWNEIGH)]     = NLMSG_LENGTH(sizeof(struct ndmsg)),
95         [RTM_FAM(RTM_NEWRULE)]      = NLMSG_LENGTH(sizeof(struct rtmsg)),
96         [RTM_FAM(RTM_NEWQDISC)]     = NLMSG_LENGTH(sizeof(struct tcmsg)),
97         [RTM_FAM(RTM_NEWTCLASS)]    = NLMSG_LENGTH(sizeof(struct tcmsg)),
98         [RTM_FAM(RTM_NEWTFILTER)]   = NLMSG_LENGTH(sizeof(struct tcmsg)),
99         [RTM_FAM(RTM_NEWACTION)]    = NLMSG_LENGTH(sizeof(struct tcamsg)),
100         [RTM_FAM(RTM_NEWPREFIX)]    = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
101         [RTM_FAM(RTM_GETMULTICAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
102         [RTM_FAM(RTM_GETANYCAST)]   = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
103         [RTM_FAM(RTM_NEWNEIGHTBL)]  = NLMSG_LENGTH(sizeof(struct ndtmsg)),
104 };
105
106 static const int rta_max[RTM_NR_FAMILIES] =
107 {
108         [RTM_FAM(RTM_NEWLINK)]      = IFLA_MAX,
109         [RTM_FAM(RTM_NEWADDR)]      = IFA_MAX,
110         [RTM_FAM(RTM_NEWROUTE)]     = RTA_MAX,
111         [RTM_FAM(RTM_NEWNEIGH)]     = NDA_MAX,
112         [RTM_FAM(RTM_NEWRULE)]      = RTA_MAX,
113         [RTM_FAM(RTM_NEWQDISC)]     = TCA_MAX,
114         [RTM_FAM(RTM_NEWTCLASS)]    = TCA_MAX,
115         [RTM_FAM(RTM_NEWTFILTER)]   = TCA_MAX,
116         [RTM_FAM(RTM_NEWACTION)]    = TCAA_MAX,
117         [RTM_FAM(RTM_NEWNEIGHTBL)]  = NDTA_MAX,
118 };
119
120 void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const void *data)
121 {
122         struct rtattr *rta;
123         int size = RTA_LENGTH(attrlen);
124
125         rta = (struct rtattr*)skb_put(skb, RTA_ALIGN(size));
126         rta->rta_type = attrtype;
127         rta->rta_len = size;
128         memcpy(RTA_DATA(rta), data, attrlen);
129         memset(RTA_DATA(rta) + attrlen, 0, RTA_ALIGN(size) - size);
130 }
131
132 size_t rtattr_strlcpy(char *dest, const struct rtattr *rta, size_t size)
133 {
134         size_t ret = RTA_PAYLOAD(rta);
135         char *src = RTA_DATA(rta);
136
137         if (ret > 0 && src[ret - 1] == '\0')
138                 ret--;
139         if (size > 0) {
140                 size_t len = (ret >= size) ? size - 1 : ret;
141                 memset(dest, 0, size);
142                 memcpy(dest, src, len);
143         }
144         return ret;
145 }
146
147 int rtnetlink_send(struct sk_buff *skb, u32 pid, unsigned group, int echo)
148 {
149         int err = 0;
150
151         NETLINK_CB(skb).dst_groups = group;
152         if (echo)
153                 atomic_inc(&skb->users);
154         netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL);
155         if (echo)
156                 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
157         return err;
158 }
159
160 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics)
161 {
162         struct rtattr *mx = (struct rtattr*)skb->tail;
163         int i;
164
165         RTA_PUT(skb, RTA_METRICS, 0, NULL);
166         for (i=0; i<RTAX_MAX; i++) {
167                 if (metrics[i])
168                         RTA_PUT(skb, i+1, sizeof(u32), metrics+i);
169         }
170         mx->rta_len = skb->tail - (u8*)mx;
171         if (mx->rta_len == RTA_LENGTH(0))
172                 skb_trim(skb, (u8*)mx - skb->data);
173         return 0;
174
175 rtattr_failure:
176         skb_trim(skb, (u8*)mx - skb->data);
177         return -1;
178 }
179
180
181 static int rtnetlink_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
182                                  int type, u32 pid, u32 seq, u32 change, 
183                                  unsigned int flags)
184 {
185         struct ifinfomsg *r;
186         struct nlmsghdr  *nlh;
187         unsigned char    *b = skb->tail;
188
189         nlh = NLMSG_NEW(skb, pid, seq, type, sizeof(*r), flags);
190         r = NLMSG_DATA(nlh);
191         r->ifi_family = AF_UNSPEC;
192         r->__ifi_pad = 0;
193         r->ifi_type = dev->type;
194         r->ifi_index = dev->ifindex;
195         r->ifi_flags = dev_get_flags(dev);
196         r->ifi_change = change;
197
198         RTA_PUT(skb, IFLA_IFNAME, strlen(dev->name)+1, dev->name);
199
200         if (1) {
201                 u32 txqlen = dev->tx_queue_len;
202                 RTA_PUT(skb, IFLA_TXQLEN, sizeof(txqlen), &txqlen);
203         }
204
205         if (1) {
206                 u32 weight = dev->weight;
207                 RTA_PUT(skb, IFLA_WEIGHT, sizeof(weight), &weight);
208         }
209
210         if (1) {
211                 struct rtnl_link_ifmap map = {
212                         .mem_start   = dev->mem_start,
213                         .mem_end     = dev->mem_end,
214                         .base_addr   = dev->base_addr,
215                         .irq         = dev->irq,
216                         .dma         = dev->dma,
217                         .port        = dev->if_port,
218                 };
219                 RTA_PUT(skb, IFLA_MAP, sizeof(map), &map);
220         }
221
222         if (dev->addr_len) {
223                 RTA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
224                 RTA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast);
225         }
226
227         if (1) {
228                 u32 mtu = dev->mtu;
229                 RTA_PUT(skb, IFLA_MTU, sizeof(mtu), &mtu);
230         }
231
232         if (dev->ifindex != dev->iflink) {
233                 u32 iflink = dev->iflink;
234                 RTA_PUT(skb, IFLA_LINK, sizeof(iflink), &iflink);
235         }
236
237         if (dev->qdisc_sleeping)
238                 RTA_PUT(skb, IFLA_QDISC,
239                         strlen(dev->qdisc_sleeping->ops->id) + 1,
240                         dev->qdisc_sleeping->ops->id);
241         
242         if (dev->master) {
243                 u32 master = dev->master->ifindex;
244                 RTA_PUT(skb, IFLA_MASTER, sizeof(master), &master);
245         }
246
247         if (dev->get_stats) {
248                 unsigned long *stats = (unsigned long*)dev->get_stats(dev);
249                 if (stats) {
250                         struct rtattr  *a;
251                         __u32          *s;
252                         int             i;
253                         int             n = sizeof(struct rtnl_link_stats)/4;
254
255                         a = __RTA_PUT(skb, IFLA_STATS, n*4);
256                         s = RTA_DATA(a);
257                         for (i=0; i<n; i++)
258                                 s[i] = stats[i];
259                 }
260         }
261         nlh->nlmsg_len = skb->tail - b;
262         return skb->len;
263
264 nlmsg_failure:
265 rtattr_failure:
266         skb_trim(skb, b - skb->data);
267         return -1;
268 }
269
270 static int rtnetlink_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
271 {
272         int idx;
273         int s_idx = cb->args[0];
274         struct net_device *dev;
275
276         read_lock(&dev_base_lock);
277         for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) {
278                 if (idx < s_idx)
279                         continue;
280                 if (rtnetlink_fill_ifinfo(skb, dev, RTM_NEWLINK,
281                                           NETLINK_CB(cb->skb).pid,
282                                           cb->nlh->nlmsg_seq, 0,
283                                           NLM_F_MULTI) <= 0)
284                         break;
285         }
286         read_unlock(&dev_base_lock);
287         cb->args[0] = idx;
288
289         return skb->len;
290 }
291
292 static int do_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
293 {
294         struct ifinfomsg  *ifm = NLMSG_DATA(nlh);
295         struct rtattr    **ida = arg;
296         struct net_device *dev;
297         int err, send_addr_notify = 0;
298
299         if (ifm->ifi_index >= 0)
300                 dev = dev_get_by_index(ifm->ifi_index);
301         else if (ida[IFLA_IFNAME - 1]) {
302                 char ifname[IFNAMSIZ];
303
304                 if (rtattr_strlcpy(ifname, ida[IFLA_IFNAME - 1],
305                                    IFNAMSIZ) >= IFNAMSIZ)
306                         return -EINVAL;
307                 dev = dev_get_by_name(ifname);
308         } else
309                 return -EINVAL;
310
311         if (!dev)
312                 return -ENODEV;
313
314         err = -EINVAL;
315
316         if (ifm->ifi_flags)
317                 dev_change_flags(dev, ifm->ifi_flags);
318
319         if (ida[IFLA_MAP - 1]) {
320                 struct rtnl_link_ifmap *u_map;
321                 struct ifmap k_map;
322
323                 if (!dev->set_config) {
324                         err = -EOPNOTSUPP;
325                         goto out;
326                 }
327
328                 if (!netif_device_present(dev)) {
329                         err = -ENODEV;
330                         goto out;
331                 }
332                 
333                 if (ida[IFLA_MAP - 1]->rta_len != RTA_LENGTH(sizeof(*u_map)))
334                         goto out;
335
336                 u_map = RTA_DATA(ida[IFLA_MAP - 1]);
337
338                 k_map.mem_start = (unsigned long) u_map->mem_start;
339                 k_map.mem_end = (unsigned long) u_map->mem_end;
340                 k_map.base_addr = (unsigned short) u_map->base_addr;
341                 k_map.irq = (unsigned char) u_map->irq;
342                 k_map.dma = (unsigned char) u_map->dma;
343                 k_map.port = (unsigned char) u_map->port;
344
345                 err = dev->set_config(dev, &k_map);
346
347                 if (err)
348                         goto out;
349         }
350
351         if (ida[IFLA_ADDRESS - 1]) {
352                 if (!dev->set_mac_address) {
353                         err = -EOPNOTSUPP;
354                         goto out;
355                 }
356                 if (!netif_device_present(dev)) {
357                         err = -ENODEV;
358                         goto out;
359                 }
360                 if (ida[IFLA_ADDRESS - 1]->rta_len != RTA_LENGTH(dev->addr_len))
361                         goto out;
362
363                 err = dev->set_mac_address(dev, RTA_DATA(ida[IFLA_ADDRESS - 1]));
364                 if (err)
365                         goto out;
366                 send_addr_notify = 1;
367         }
368
369         if (ida[IFLA_BROADCAST - 1]) {
370                 if (ida[IFLA_BROADCAST - 1]->rta_len != RTA_LENGTH(dev->addr_len))
371                         goto out;
372                 memcpy(dev->broadcast, RTA_DATA(ida[IFLA_BROADCAST - 1]),
373                        dev->addr_len);
374                 send_addr_notify = 1;
375         }
376
377         if (ida[IFLA_MTU - 1]) {
378                 if (ida[IFLA_MTU - 1]->rta_len != RTA_LENGTH(sizeof(u32)))
379                         goto out;
380                 err = dev_set_mtu(dev, *((u32 *) RTA_DATA(ida[IFLA_MTU - 1])));
381
382                 if (err)
383                         goto out;
384
385         }
386
387         if (ida[IFLA_TXQLEN - 1]) {
388                 if (ida[IFLA_TXQLEN - 1]->rta_len != RTA_LENGTH(sizeof(u32)))
389                         goto out;
390
391                 dev->tx_queue_len = *((u32 *) RTA_DATA(ida[IFLA_TXQLEN - 1]));
392         }
393
394         if (ida[IFLA_WEIGHT - 1]) {
395                 if (ida[IFLA_WEIGHT - 1]->rta_len != RTA_LENGTH(sizeof(u32)))
396                         goto out;
397
398                 dev->weight = *((u32 *) RTA_DATA(ida[IFLA_WEIGHT - 1]));
399         }
400
401         if (ifm->ifi_index >= 0 && ida[IFLA_IFNAME - 1]) {
402                 char ifname[IFNAMSIZ];
403
404                 if (rtattr_strlcpy(ifname, ida[IFLA_IFNAME - 1],
405                                    IFNAMSIZ) >= IFNAMSIZ)
406                         goto out;
407                 err = dev_change_name(dev, ifname);
408                 if (err)
409                         goto out;
410         }
411
412         err = 0;
413
414 out:
415         if (send_addr_notify)
416                 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
417
418         dev_put(dev);
419         return err;
420 }
421
422 static int rtnetlink_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
423 {
424         int idx;
425         int s_idx = cb->family;
426
427         if (s_idx == 0)
428                 s_idx = 1;
429         for (idx=1; idx<NPROTO; idx++) {
430                 int type = cb->nlh->nlmsg_type-RTM_BASE;
431                 if (idx < s_idx || idx == PF_PACKET)
432                         continue;
433                 if (rtnetlink_links[idx] == NULL ||
434                     rtnetlink_links[idx][type].dumpit == NULL)
435                         continue;
436                 if (idx > s_idx)
437                         memset(&cb->args[0], 0, sizeof(cb->args));
438                 if (rtnetlink_links[idx][type].dumpit(skb, cb))
439                         break;
440         }
441         cb->family = idx;
442
443         return skb->len;
444 }
445
446 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change)
447 {
448         struct sk_buff *skb;
449         int size = NLMSG_SPACE(sizeof(struct ifinfomsg) +
450                                sizeof(struct rtnl_link_ifmap) +
451                                sizeof(struct rtnl_link_stats) + 128);
452
453         skb = alloc_skb(size, GFP_KERNEL);
454         if (!skb)
455                 return;
456
457         if (rtnetlink_fill_ifinfo(skb, dev, type, current->pid, 0, change, 0) < 0) {
458                 kfree_skb(skb);
459                 return;
460         }
461         NETLINK_CB(skb).dst_groups = RTMGRP_LINK;
462         netlink_broadcast(rtnl, skb, 0, RTMGRP_LINK, GFP_KERNEL);
463 }
464
465 static int rtnetlink_done(struct netlink_callback *cb)
466 {
467         return 0;
468 }
469
470 /* Protected by RTNL sempahore.  */
471 static struct rtattr **rta_buf;
472 static int rtattr_max;
473
474 /* Process one rtnetlink message. */
475
476 static __inline__ int
477 rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, int *errp)
478 {
479         struct rtnetlink_link *link;
480         struct rtnetlink_link *link_tab;
481         int sz_idx, kind;
482         int min_len;
483         int family;
484         int type;
485         int err;
486
487         /* Only requests are handled by kernel now */
488         if (!(nlh->nlmsg_flags&NLM_F_REQUEST))
489                 return 0;
490
491         type = nlh->nlmsg_type;
492
493         /* A control message: ignore them */
494         if (type < RTM_BASE)
495                 return 0;
496
497         /* Unknown message: reply with EINVAL */
498         if (type > RTM_MAX)
499                 goto err_inval;
500
501         type -= RTM_BASE;
502
503         /* All the messages must have at least 1 byte length */
504         if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg)))
505                 return 0;
506
507         family = ((struct rtgenmsg*)NLMSG_DATA(nlh))->rtgen_family;
508         if (family >= NPROTO) {
509                 *errp = -EAFNOSUPPORT;
510                 return -1;
511         }
512
513         link_tab = rtnetlink_links[family];
514         if (link_tab == NULL)
515                 link_tab = rtnetlink_links[PF_UNSPEC];
516         link = &link_tab[type];
517
518         sz_idx = type>>2;
519         kind = type&3;
520
521         if (kind != 2 && security_netlink_recv(skb)) {
522                 *errp = -EPERM;
523                 return -1;
524         }
525
526         if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
527                 u32 rlen;
528
529                 if (link->dumpit == NULL)
530                         link = &(rtnetlink_links[PF_UNSPEC][type]);
531
532                 if (link->dumpit == NULL)
533                         goto err_inval;
534
535                 if ((*errp = netlink_dump_start(rtnl, skb, nlh,
536                                                 link->dumpit,
537                                                 rtnetlink_done)) != 0) {
538                         return -1;
539                 }
540                 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
541                 if (rlen > skb->len)
542                         rlen = skb->len;
543                 skb_pull(skb, rlen);
544                 return -1;
545         }
546
547         memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *)));
548
549         min_len = rtm_min[sz_idx];
550         if (nlh->nlmsg_len < min_len)
551                 goto err_inval;
552
553         if (nlh->nlmsg_len > min_len) {
554                 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
555                 struct rtattr *attr = (void*)nlh + NLMSG_ALIGN(min_len);
556
557                 while (RTA_OK(attr, attrlen)) {
558                         unsigned flavor = attr->rta_type;
559                         if (flavor) {
560                                 if (flavor > rta_max[sz_idx])
561                                         goto err_inval;
562                                 rta_buf[flavor-1] = attr;
563                         }
564                         attr = RTA_NEXT(attr, attrlen);
565                 }
566         }
567
568         if (link->doit == NULL)
569                 link = &(rtnetlink_links[PF_UNSPEC][type]);
570         if (link->doit == NULL)
571                 goto err_inval;
572         err = link->doit(skb, nlh, (void *)&rta_buf[0]);
573
574         *errp = err;
575         return err;
576
577 err_inval:
578         *errp = -EINVAL;
579         return -1;
580 }
581
582 /* 
583  * Process one packet of messages.
584  * Malformed skbs with wrong lengths of messages are discarded silently.
585  */
586
587 static inline int rtnetlink_rcv_skb(struct sk_buff *skb)
588 {
589         int err;
590         struct nlmsghdr * nlh;
591
592         while (skb->len >= NLMSG_SPACE(0)) {
593                 u32 rlen;
594
595                 nlh = (struct nlmsghdr *)skb->data;
596                 if (nlh->nlmsg_len < sizeof(*nlh) || skb->len < nlh->nlmsg_len)
597                         return 0;
598                 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
599                 if (rlen > skb->len)
600                         rlen = skb->len;
601                 if (rtnetlink_rcv_msg(skb, nlh, &err)) {
602                         /* Not error, but we must interrupt processing here:
603                          *   Note, that in this case we do not pull message
604                          *   from skb, it will be processed later.
605                          */
606                         if (err == 0)
607                                 return -1;
608                         netlink_ack(skb, nlh, err);
609                 } else if (nlh->nlmsg_flags&NLM_F_ACK)
610                         netlink_ack(skb, nlh, 0);
611                 skb_pull(skb, rlen);
612         }
613
614         return 0;
615 }
616
617 /*
618  *  rtnetlink input queue processing routine:
619  *      - process as much as there was in the queue upon entry.
620  *      - feed skbs to rtnetlink_rcv_skb, until it refuse a message,
621  *        that will occur, when a dump started.
622  */
623
624 static void rtnetlink_rcv(struct sock *sk, int len)
625 {
626         unsigned int qlen = skb_queue_len(&sk->sk_receive_queue);
627
628         do {
629                 struct sk_buff *skb;
630
631                 rtnl_lock();
632
633                 if (qlen > skb_queue_len(&sk->sk_receive_queue))
634                         qlen = skb_queue_len(&sk->sk_receive_queue);
635
636                 for (; qlen; qlen--) {
637                         skb = skb_dequeue(&sk->sk_receive_queue);
638                         if (rtnetlink_rcv_skb(skb)) {
639                                 if (skb->len)
640                                         skb_queue_head(&sk->sk_receive_queue,
641                                                        skb);
642                                 else {
643                                         kfree_skb(skb);
644                                         qlen--;
645                                 }
646                                 break;
647                         }
648                         kfree_skb(skb);
649                 }
650
651                 up(&rtnl_sem);
652
653                 netdev_run_todo();
654         } while (qlen);
655 }
656
657 static struct rtnetlink_link link_rtnetlink_table[RTM_NR_MSGTYPES] =
658 {
659         [RTM_GETLINK     - RTM_BASE] = { .dumpit = rtnetlink_dump_ifinfo },
660         [RTM_SETLINK     - RTM_BASE] = { .doit   = do_setlink            },
661         [RTM_GETADDR     - RTM_BASE] = { .dumpit = rtnetlink_dump_all    },
662         [RTM_GETROUTE    - RTM_BASE] = { .dumpit = rtnetlink_dump_all    },
663         [RTM_NEWNEIGH    - RTM_BASE] = { .doit   = neigh_add             },
664         [RTM_DELNEIGH    - RTM_BASE] = { .doit   = neigh_delete          },
665         [RTM_GETNEIGH    - RTM_BASE] = { .dumpit = neigh_dump_info       },
666         [RTM_GETRULE     - RTM_BASE] = { .dumpit = rtnetlink_dump_all    },
667         [RTM_GETNEIGHTBL - RTM_BASE] = { .dumpit = neightbl_dump_info    },
668         [RTM_SETNEIGHTBL - RTM_BASE] = { .doit   = neightbl_set          },
669 };
670
671 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
672 {
673         struct net_device *dev = ptr;
674         switch (event) {
675         case NETDEV_UNREGISTER:
676                 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);
677                 break;
678         case NETDEV_REGISTER:
679                 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
680                 break;
681         case NETDEV_UP:
682         case NETDEV_DOWN:
683                 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
684                 break;
685         case NETDEV_CHANGE:
686         case NETDEV_GOING_DOWN:
687                 break;
688         default:
689                 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
690                 break;
691         }
692         return NOTIFY_DONE;
693 }
694
695 static struct notifier_block rtnetlink_dev_notifier = {
696         .notifier_call  = rtnetlink_event,
697 };
698
699 void __init rtnetlink_init(void)
700 {
701         int i;
702
703         rtattr_max = 0;
704         for (i = 0; i < ARRAY_SIZE(rta_max); i++)
705                 if (rta_max[i] > rtattr_max)
706                         rtattr_max = rta_max[i];
707         rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL);
708         if (!rta_buf)
709                 panic("rtnetlink_init: cannot allocate rta_buf\n");
710
711         rtnl = netlink_kernel_create(NETLINK_ROUTE, rtnetlink_rcv, THIS_MODULE);
712         if (rtnl == NULL)
713                 panic("rtnetlink_init: cannot initialize rtnetlink\n");
714         netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV);
715         register_netdevice_notifier(&rtnetlink_dev_notifier);
716         rtnetlink_links[PF_UNSPEC] = link_rtnetlink_table;
717         rtnetlink_links[PF_PACKET] = link_rtnetlink_table;
718 }
719
720 EXPORT_SYMBOL(__rta_fill);
721 EXPORT_SYMBOL(rtattr_strlcpy);
722 EXPORT_SYMBOL(rtattr_parse);
723 EXPORT_SYMBOL(rtnetlink_links);
724 EXPORT_SYMBOL(rtnetlink_put_metrics);
725 EXPORT_SYMBOL(rtnl);
726 EXPORT_SYMBOL(rtnl_lock);
727 EXPORT_SYMBOL(rtnl_lock_interruptible);
728 EXPORT_SYMBOL(rtnl_sem);
729 EXPORT_SYMBOL(rtnl_unlock);