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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
54DECLARE_MUTEX(rtnl_sem);
55
56void rtnl_lock(void)
57{
58 rtnl_shlock();
59}
60
61int rtnl_lock_interruptible(void)
62{
63 return down_interruptible(&rtnl_sem);
64}
65
66void rtnl_unlock(void)
67{
68 rtnl_shunlock();
69
70 netdev_run_todo();
71}
72
73int 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
86struct sock *rtnl;
87
88struct rtnetlink_link * rtnetlink_links[NPROTO];
89
90static 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
103static 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
116void __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
127size_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
142int 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
155int 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
170rtattr_failure:
171 skb_trim(skb, (u8*)mx - skb->data);
172 return -1;
173}
174
175
176static 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
258nlmsg_failure:
259rtattr_failure:
260 skb_trim(skb, b - skb->data);
261 return -1;
262}
263
264static 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
283static 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
405out:
406 if (send_addr_notify)
407 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
408
409 dev_put(dev);
410 return err;
411}
412
413static 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
437void 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
456static int rtnetlink_done(struct netlink_callback *cb)
457{
458 return 0;
459}
460
461
462static struct rtattr **rta_buf;
463static int rtattr_max;
464
465
466
467static __inline__ int
468rtnetlink_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
479 if (!(nlh->nlmsg_flags&NLM_F_REQUEST))
480 return 0;
481
482 type = nlh->nlmsg_type;
483
484
485 if (type < RTM_BASE)
486 return 0;
487
488
489 if (type > RTM_MAX)
490 goto err_inval;
491
492 type -= RTM_BASE;
493
494
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
568err_inval:
569 *errp = -EINVAL;
570 return -1;
571}
572
573
574
575
576
577
578static 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
594
595
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
610
611
612
613
614
615
616static 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
642static 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};
652
653static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
654{
655 struct net_device *dev = ptr;
656 switch (event) {
657 case NETDEV_UNREGISTER:
658 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);
659 break;
660 case NETDEV_REGISTER:
661 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
662 break;
663 case NETDEV_UP:
664 case NETDEV_DOWN:
665 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
666 break;
667 case NETDEV_CHANGE:
668 case NETDEV_GOING_DOWN:
669 break;
670 default:
671 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
672 break;
673 }
674 return NOTIFY_DONE;
675}
676
677static struct notifier_block rtnetlink_dev_notifier = {
678 .notifier_call = rtnetlink_event,
679};
680
681void __init rtnetlink_init(void)
682{
683 int i;
684
685 rtattr_max = 0;
686 for (i = 0; i < ARRAY_SIZE(rta_max); i++)
687 if (rta_max[i] > rtattr_max)
688 rtattr_max = rta_max[i];
689 rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL);
690 if (!rta_buf)
691 panic("rtnetlink_init: cannot allocate rta_buf\n");
692
693 rtnl = netlink_kernel_create(NETLINK_ROUTE, rtnetlink_rcv);
694 if (rtnl == NULL)
695 panic("rtnetlink_init: cannot initialize rtnetlink\n");
696 netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV);
697 register_netdevice_notifier(&rtnetlink_dev_notifier);
698 rtnetlink_links[PF_UNSPEC] = link_rtnetlink_table;
699 rtnetlink_links[PF_PACKET] = link_rtnetlink_table;
700}
701
702EXPORT_SYMBOL(__rta_fill);
703EXPORT_SYMBOL(rtattr_strlcpy);
704EXPORT_SYMBOL(rtattr_parse);
705EXPORT_SYMBOL(rtnetlink_links);
706EXPORT_SYMBOL(rtnetlink_put_metrics);
707EXPORT_SYMBOL(rtnl);
708EXPORT_SYMBOL(rtnl_lock);
709EXPORT_SYMBOL(rtnl_lock_interruptible);
710EXPORT_SYMBOL(rtnl_sem);
711EXPORT_SYMBOL(rtnl_unlock);
712
