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