Loading...
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#include <linux/pci.h>
39
40#include <asm/uaccess.h>
41#include <asm/system.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/rtnetlink.h>
54#include <net/net_namespace.h>
55
56struct rtnl_link {
57 rtnl_doit_func doit;
58 rtnl_dumpit_func dumpit;
59 rtnl_calcit_func calcit;
60};
61
62static DEFINE_MUTEX(rtnl_mutex);
63static u16 min_ifinfo_dump_size;
64
65void rtnl_lock(void)
66{
67 mutex_lock(&rtnl_mutex);
68}
69EXPORT_SYMBOL(rtnl_lock);
70
71void __rtnl_unlock(void)
72{
73 mutex_unlock(&rtnl_mutex);
74}
75
76void rtnl_unlock(void)
77{
78 /* This fellow will unlock it for us. */
79 netdev_run_todo();
80}
81EXPORT_SYMBOL(rtnl_unlock);
82
83int rtnl_trylock(void)
84{
85 return mutex_trylock(&rtnl_mutex);
86}
87EXPORT_SYMBOL(rtnl_trylock);
88
89int rtnl_is_locked(void)
90{
91 return mutex_is_locked(&rtnl_mutex);
92}
93EXPORT_SYMBOL(rtnl_is_locked);
94
95#ifdef CONFIG_PROVE_LOCKING
96int lockdep_rtnl_is_held(void)
97{
98 return lockdep_is_held(&rtnl_mutex);
99}
100EXPORT_SYMBOL(lockdep_rtnl_is_held);
101#endif /* #ifdef CONFIG_PROVE_LOCKING */
102
103static struct rtnl_link *rtnl_msg_handlers[RTNL_FAMILY_MAX + 1];
104
105static inline int rtm_msgindex(int msgtype)
106{
107 int msgindex = msgtype - RTM_BASE;
108
109 /*
110 * msgindex < 0 implies someone tried to register a netlink
111 * control code. msgindex >= RTM_NR_MSGTYPES may indicate that
112 * the message type has not been added to linux/rtnetlink.h
113 */
114 BUG_ON(msgindex < 0 || msgindex >= RTM_NR_MSGTYPES);
115
116 return msgindex;
117}
118
119static rtnl_doit_func rtnl_get_doit(int protocol, int msgindex)
120{
121 struct rtnl_link *tab;
122
123 if (protocol <= RTNL_FAMILY_MAX)
124 tab = rtnl_msg_handlers[protocol];
125 else
126 tab = NULL;
127
128 if (tab == NULL || tab[msgindex].doit == NULL)
129 tab = rtnl_msg_handlers[PF_UNSPEC];
130
131 return tab ? tab[msgindex].doit : NULL;
132}
133
134static rtnl_dumpit_func rtnl_get_dumpit(int protocol, int msgindex)
135{
136 struct rtnl_link *tab;
137
138 if (protocol <= RTNL_FAMILY_MAX)
139 tab = rtnl_msg_handlers[protocol];
140 else
141 tab = NULL;
142
143 if (tab == NULL || tab[msgindex].dumpit == NULL)
144 tab = rtnl_msg_handlers[PF_UNSPEC];
145
146 return tab ? tab[msgindex].dumpit : NULL;
147}
148
149static rtnl_calcit_func rtnl_get_calcit(int protocol, int msgindex)
150{
151 struct rtnl_link *tab;
152
153 if (protocol <= RTNL_FAMILY_MAX)
154 tab = rtnl_msg_handlers[protocol];
155 else
156 tab = NULL;
157
158 if (tab == NULL || tab[msgindex].calcit == NULL)
159 tab = rtnl_msg_handlers[PF_UNSPEC];
160
161 return tab ? tab[msgindex].calcit : NULL;
162}
163
164/**
165 * __rtnl_register - Register a rtnetlink message type
166 * @protocol: Protocol family or PF_UNSPEC
167 * @msgtype: rtnetlink message type
168 * @doit: Function pointer called for each request message
169 * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message
170 * @calcit: Function pointer to calc size of dump message
171 *
172 * Registers the specified function pointers (at least one of them has
173 * to be non-NULL) to be called whenever a request message for the
174 * specified protocol family and message type is received.
175 *
176 * The special protocol family PF_UNSPEC may be used to define fallback
177 * function pointers for the case when no entry for the specific protocol
178 * family exists.
179 *
180 * Returns 0 on success or a negative error code.
181 */
182int __rtnl_register(int protocol, int msgtype,
183 rtnl_doit_func doit, rtnl_dumpit_func dumpit,
184 rtnl_calcit_func calcit)
185{
186 struct rtnl_link *tab;
187 int msgindex;
188
189 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
190 msgindex = rtm_msgindex(msgtype);
191
192 tab = rtnl_msg_handlers[protocol];
193 if (tab == NULL) {
194 tab = kcalloc(RTM_NR_MSGTYPES, sizeof(*tab), GFP_KERNEL);
195 if (tab == NULL)
196 return -ENOBUFS;
197
198 rtnl_msg_handlers[protocol] = tab;
199 }
200
201 if (doit)
202 tab[msgindex].doit = doit;
203
204 if (dumpit)
205 tab[msgindex].dumpit = dumpit;
206
207 if (calcit)
208 tab[msgindex].calcit = calcit;
209
210 return 0;
211}
212EXPORT_SYMBOL_GPL(__rtnl_register);
213
214/**
215 * rtnl_register - Register a rtnetlink message type
216 *
217 * Identical to __rtnl_register() but panics on failure. This is useful
218 * as failure of this function is very unlikely, it can only happen due
219 * to lack of memory when allocating the chain to store all message
220 * handlers for a protocol. Meant for use in init functions where lack
221 * of memory implies no sense in continuing.
222 */
223void rtnl_register(int protocol, int msgtype,
224 rtnl_doit_func doit, rtnl_dumpit_func dumpit,
225 rtnl_calcit_func calcit)
226{
227 if (__rtnl_register(protocol, msgtype, doit, dumpit, calcit) < 0)
228 panic("Unable to register rtnetlink message handler, "
229 "protocol = %d, message type = %d\n",
230 protocol, msgtype);
231}
232EXPORT_SYMBOL_GPL(rtnl_register);
233
234/**
235 * rtnl_unregister - Unregister a rtnetlink message type
236 * @protocol: Protocol family or PF_UNSPEC
237 * @msgtype: rtnetlink message type
238 *
239 * Returns 0 on success or a negative error code.
240 */
241int rtnl_unregister(int protocol, int msgtype)
242{
243 int msgindex;
244
245 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
246 msgindex = rtm_msgindex(msgtype);
247
248 if (rtnl_msg_handlers[protocol] == NULL)
249 return -ENOENT;
250
251 rtnl_msg_handlers[protocol][msgindex].doit = NULL;
252 rtnl_msg_handlers[protocol][msgindex].dumpit = NULL;
253
254 return 0;
255}
256EXPORT_SYMBOL_GPL(rtnl_unregister);
257
258/**
259 * rtnl_unregister_all - Unregister all rtnetlink message type of a protocol
260 * @protocol : Protocol family or PF_UNSPEC
261 *
262 * Identical to calling rtnl_unregster() for all registered message types
263 * of a certain protocol family.
264 */
265void rtnl_unregister_all(int protocol)
266{
267 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
268
269 kfree(rtnl_msg_handlers[protocol]);
270 rtnl_msg_handlers[protocol] = NULL;
271}
272EXPORT_SYMBOL_GPL(rtnl_unregister_all);
273
274static LIST_HEAD(link_ops);
275
276/**
277 * __rtnl_link_register - Register rtnl_link_ops with rtnetlink.
278 * @ops: struct rtnl_link_ops * to register
279 *
280 * The caller must hold the rtnl_mutex. This function should be used
281 * by drivers that create devices during module initialization. It
282 * must be called before registering the devices.
283 *
284 * Returns 0 on success or a negative error code.
285 */
286int __rtnl_link_register(struct rtnl_link_ops *ops)
287{
288 if (!ops->dellink)
289 ops->dellink = unregister_netdevice_queue;
290
291 list_add_tail(&ops->list, &link_ops);
292 return 0;
293}
294EXPORT_SYMBOL_GPL(__rtnl_link_register);
295
296/**
297 * rtnl_link_register - Register rtnl_link_ops with rtnetlink.
298 * @ops: struct rtnl_link_ops * to register
299 *
300 * Returns 0 on success or a negative error code.
301 */
302int rtnl_link_register(struct rtnl_link_ops *ops)
303{
304 int err;
305
306 rtnl_lock();
307 err = __rtnl_link_register(ops);
308 rtnl_unlock();
309 return err;
310}
311EXPORT_SYMBOL_GPL(rtnl_link_register);
312
313static void __rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops)
314{
315 struct net_device *dev;
316 LIST_HEAD(list_kill);
317
318 for_each_netdev(net, dev) {
319 if (dev->rtnl_link_ops == ops)
320 ops->dellink(dev, &list_kill);
321 }
322 unregister_netdevice_many(&list_kill);
323}
324
325/**
326 * __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
327 * @ops: struct rtnl_link_ops * to unregister
328 *
329 * The caller must hold the rtnl_mutex.
330 */
331void __rtnl_link_unregister(struct rtnl_link_ops *ops)
332{
333 struct net *net;
334
335 for_each_net(net) {
336 __rtnl_kill_links(net, ops);
337 }
338 list_del(&ops->list);
339}
340EXPORT_SYMBOL_GPL(__rtnl_link_unregister);
341
342/**
343 * rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
344 * @ops: struct rtnl_link_ops * to unregister
345 */
346void rtnl_link_unregister(struct rtnl_link_ops *ops)
347{
348 rtnl_lock();
349 __rtnl_link_unregister(ops);
350 rtnl_unlock();
351}
352EXPORT_SYMBOL_GPL(rtnl_link_unregister);
353
354static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind)
355{
356 const struct rtnl_link_ops *ops;
357
358 list_for_each_entry(ops, &link_ops, list) {
359 if (!strcmp(ops->kind, kind))
360 return ops;
361 }
362 return NULL;
363}
364
365static size_t rtnl_link_get_size(const struct net_device *dev)
366{
367 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
368 size_t size;
369
370 if (!ops)
371 return 0;
372
373 size = nla_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */
374 nla_total_size(strlen(ops->kind) + 1); /* IFLA_INFO_KIND */
375
376 if (ops->get_size)
377 /* IFLA_INFO_DATA + nested data */
378 size += nla_total_size(sizeof(struct nlattr)) +
379 ops->get_size(dev);
380
381 if (ops->get_xstats_size)
382 /* IFLA_INFO_XSTATS */
383 size += nla_total_size(ops->get_xstats_size(dev));
384
385 return size;
386}
387
388static LIST_HEAD(rtnl_af_ops);
389
390static const struct rtnl_af_ops *rtnl_af_lookup(const int family)
391{
392 const struct rtnl_af_ops *ops;
393
394 list_for_each_entry(ops, &rtnl_af_ops, list) {
395 if (ops->family == family)
396 return ops;
397 }
398
399 return NULL;
400}
401
402/**
403 * __rtnl_af_register - Register rtnl_af_ops with rtnetlink.
404 * @ops: struct rtnl_af_ops * to register
405 *
406 * The caller must hold the rtnl_mutex.
407 *
408 * Returns 0 on success or a negative error code.
409 */
410int __rtnl_af_register(struct rtnl_af_ops *ops)
411{
412 list_add_tail(&ops->list, &rtnl_af_ops);
413 return 0;
414}
415EXPORT_SYMBOL_GPL(__rtnl_af_register);
416
417/**
418 * rtnl_af_register - Register rtnl_af_ops with rtnetlink.
419 * @ops: struct rtnl_af_ops * to register
420 *
421 * Returns 0 on success or a negative error code.
422 */
423int rtnl_af_register(struct rtnl_af_ops *ops)
424{
425 int err;
426
427 rtnl_lock();
428 err = __rtnl_af_register(ops);
429 rtnl_unlock();
430 return err;
431}
432EXPORT_SYMBOL_GPL(rtnl_af_register);
433
434/**
435 * __rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink.
436 * @ops: struct rtnl_af_ops * to unregister
437 *
438 * The caller must hold the rtnl_mutex.
439 */
440void __rtnl_af_unregister(struct rtnl_af_ops *ops)
441{
442 list_del(&ops->list);
443}
444EXPORT_SYMBOL_GPL(__rtnl_af_unregister);
445
446/**
447 * rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink.
448 * @ops: struct rtnl_af_ops * to unregister
449 */
450void rtnl_af_unregister(struct rtnl_af_ops *ops)
451{
452 rtnl_lock();
453 __rtnl_af_unregister(ops);
454 rtnl_unlock();
455}
456EXPORT_SYMBOL_GPL(rtnl_af_unregister);
457
458static size_t rtnl_link_get_af_size(const struct net_device *dev)
459{
460 struct rtnl_af_ops *af_ops;
461 size_t size;
462
463 /* IFLA_AF_SPEC */
464 size = nla_total_size(sizeof(struct nlattr));
465
466 list_for_each_entry(af_ops, &rtnl_af_ops, list) {
467 if (af_ops->get_link_af_size) {
468 /* AF_* + nested data */
469 size += nla_total_size(sizeof(struct nlattr)) +
470 af_ops->get_link_af_size(dev);
471 }
472 }
473
474 return size;
475}
476
477static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev)
478{
479 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
480 struct nlattr *linkinfo, *data;
481 int err = -EMSGSIZE;
482
483 linkinfo = nla_nest_start(skb, IFLA_LINKINFO);
484 if (linkinfo == NULL)
485 goto out;
486
487 if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0)
488 goto err_cancel_link;
489 if (ops->fill_xstats) {
490 err = ops->fill_xstats(skb, dev);
491 if (err < 0)
492 goto err_cancel_link;
493 }
494 if (ops->fill_info) {
495 data = nla_nest_start(skb, IFLA_INFO_DATA);
496 if (data == NULL)
497 goto err_cancel_link;
498 err = ops->fill_info(skb, dev);
499 if (err < 0)
500 goto err_cancel_data;
501 nla_nest_end(skb, data);
502 }
503
504 nla_nest_end(skb, linkinfo);
505 return 0;
506
507err_cancel_data:
508 nla_nest_cancel(skb, data);
509err_cancel_link:
510 nla_nest_cancel(skb, linkinfo);
511out:
512 return err;
513}
514
515static const int rtm_min[RTM_NR_FAMILIES] =
516{
517 [RTM_FAM(RTM_NEWLINK)] = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
518 [RTM_FAM(RTM_NEWADDR)] = NLMSG_LENGTH(sizeof(struct ifaddrmsg)),
519 [RTM_FAM(RTM_NEWROUTE)] = NLMSG_LENGTH(sizeof(struct rtmsg)),
520 [RTM_FAM(RTM_NEWRULE)] = NLMSG_LENGTH(sizeof(struct fib_rule_hdr)),
521 [RTM_FAM(RTM_NEWQDISC)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
522 [RTM_FAM(RTM_NEWTCLASS)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
523 [RTM_FAM(RTM_NEWTFILTER)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
524 [RTM_FAM(RTM_NEWACTION)] = NLMSG_LENGTH(sizeof(struct tcamsg)),
525 [RTM_FAM(RTM_GETMULTICAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
526 [RTM_FAM(RTM_GETANYCAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
527};
528
529static const int rta_max[RTM_NR_FAMILIES] =
530{
531 [RTM_FAM(RTM_NEWLINK)] = IFLA_MAX,
532 [RTM_FAM(RTM_NEWADDR)] = IFA_MAX,
533 [RTM_FAM(RTM_NEWROUTE)] = RTA_MAX,
534 [RTM_FAM(RTM_NEWRULE)] = FRA_MAX,
535 [RTM_FAM(RTM_NEWQDISC)] = TCA_MAX,
536 [RTM_FAM(RTM_NEWTCLASS)] = TCA_MAX,
537 [RTM_FAM(RTM_NEWTFILTER)] = TCA_MAX,
538 [RTM_FAM(RTM_NEWACTION)] = TCAA_MAX,
539};
540
541void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const void *data)
542{
543 struct rtattr *rta;
544 int size = RTA_LENGTH(attrlen);
545
546 rta = (struct rtattr *)skb_put(skb, RTA_ALIGN(size));
547 rta->rta_type = attrtype;
548 rta->rta_len = size;
549 memcpy(RTA_DATA(rta), data, attrlen);
550 memset(RTA_DATA(rta) + attrlen, 0, RTA_ALIGN(size) - size);
551}
552EXPORT_SYMBOL(__rta_fill);
553
554int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned group, int echo)
555{
556 struct sock *rtnl = net->rtnl;
557 int err = 0;
558
559 NETLINK_CB(skb).dst_group = group;
560 if (echo)
561 atomic_inc(&skb->users);
562 netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL);
563 if (echo)
564 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
565 return err;
566}
567
568int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid)
569{
570 struct sock *rtnl = net->rtnl;
571
572 return nlmsg_unicast(rtnl, skb, pid);
573}
574EXPORT_SYMBOL(rtnl_unicast);
575
576void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group,
577 struct nlmsghdr *nlh, gfp_t flags)
578{
579 struct sock *rtnl = net->rtnl;
580 int report = 0;
581
582 if (nlh)
583 report = nlmsg_report(nlh);
584
585 nlmsg_notify(rtnl, skb, pid, group, report, flags);
586}
587EXPORT_SYMBOL(rtnl_notify);
588
589void rtnl_set_sk_err(struct net *net, u32 group, int error)
590{
591 struct sock *rtnl = net->rtnl;
592
593 netlink_set_err(rtnl, 0, group, error);
594}
595EXPORT_SYMBOL(rtnl_set_sk_err);
596
597int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics)
598{
599 struct nlattr *mx;
600 int i, valid = 0;
601
602 mx = nla_nest_start(skb, RTA_METRICS);
603 if (mx == NULL)
604 return -ENOBUFS;
605
606 for (i = 0; i < RTAX_MAX; i++) {
607 if (metrics[i]) {
608 valid++;
609 NLA_PUT_U32(skb, i+1, metrics[i]);
610 }
611 }
612
613 if (!valid) {
614 nla_nest_cancel(skb, mx);
615 return 0;
616 }
617
618 return nla_nest_end(skb, mx);
619
620nla_put_failure:
621 nla_nest_cancel(skb, mx);
622 return -EMSGSIZE;
623}
624EXPORT_SYMBOL(rtnetlink_put_metrics);
625
626int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id,
627 u32 ts, u32 tsage, long expires, u32 error)
628{
629 struct rta_cacheinfo ci = {
630 .rta_lastuse = jiffies_to_clock_t(jiffies - dst->lastuse),
631 .rta_used = dst->__use,
632 .rta_clntref = atomic_read(&(dst->__refcnt)),
633 .rta_error = error,
634 .rta_id = id,
635 .rta_ts = ts,
636 .rta_tsage = tsage,
637 };
638
639 if (expires)
640 ci.rta_expires = jiffies_to_clock_t(expires);
641
642 return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci);
643}
644EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo);
645
646static void set_operstate(struct net_device *dev, unsigned char transition)
647{
648 unsigned char operstate = dev->operstate;
649
650 switch (transition) {
651 case IF_OPER_UP:
652 if ((operstate == IF_OPER_DORMANT ||
653 operstate == IF_OPER_UNKNOWN) &&
654 !netif_dormant(dev))
655 operstate = IF_OPER_UP;
656 break;
657
658 case IF_OPER_DORMANT:
659 if (operstate == IF_OPER_UP ||
660 operstate == IF_OPER_UNKNOWN)
661 operstate = IF_OPER_DORMANT;
662 break;
663 }
664
665 if (dev->operstate != operstate) {
666 write_lock_bh(&dev_base_lock);
667 dev->operstate = operstate;
668 write_unlock_bh(&dev_base_lock);
669 netdev_state_change(dev);
670 }
671}
672
673static unsigned int rtnl_dev_combine_flags(const struct net_device *dev,
674 const struct ifinfomsg *ifm)
675{
676 unsigned int flags = ifm->ifi_flags;
677
678 /* bugwards compatibility: ifi_change == 0 is treated as ~0 */
679 if (ifm->ifi_change)
680 flags = (flags & ifm->ifi_change) |
681 (dev->flags & ~ifm->ifi_change);
682
683 return flags;
684}
685
686static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
687 const struct rtnl_link_stats64 *b)
688{
689 a->rx_packets = b->rx_packets;
690 a->tx_packets = b->tx_packets;
691 a->rx_bytes = b->rx_bytes;
692 a->tx_bytes = b->tx_bytes;
693 a->rx_errors = b->rx_errors;
694 a->tx_errors = b->tx_errors;
695 a->rx_dropped = b->rx_dropped;
696 a->tx_dropped = b->tx_dropped;
697
698 a->multicast = b->multicast;
699 a->collisions = b->collisions;
700
701 a->rx_length_errors = b->rx_length_errors;
702 a->rx_over_errors = b->rx_over_errors;
703 a->rx_crc_errors = b->rx_crc_errors;
704 a->rx_frame_errors = b->rx_frame_errors;
705 a->rx_fifo_errors = b->rx_fifo_errors;
706 a->rx_missed_errors = b->rx_missed_errors;
707
708 a->tx_aborted_errors = b->tx_aborted_errors;
709 a->tx_carrier_errors = b->tx_carrier_errors;
710 a->tx_fifo_errors = b->tx_fifo_errors;
711 a->tx_heartbeat_errors = b->tx_heartbeat_errors;
712 a->tx_window_errors = b->tx_window_errors;
713
714 a->rx_compressed = b->rx_compressed;
715 a->tx_compressed = b->tx_compressed;
716}
717
718static void copy_rtnl_link_stats64(void *v, const struct rtnl_link_stats64 *b)
719{
720 memcpy(v, b, sizeof(*b));
721}
722
723/* All VF info */
724static inline int rtnl_vfinfo_size(const struct net_device *dev)
725{
726 if (dev->dev.parent && dev_is_pci(dev->dev.parent)) {
727
728 int num_vfs = dev_num_vf(dev->dev.parent);
729 size_t size = nla_total_size(sizeof(struct nlattr));
730 size += nla_total_size(num_vfs * sizeof(struct nlattr));
731 size += num_vfs *
732 (nla_total_size(sizeof(struct ifla_vf_mac)) +
733 nla_total_size(sizeof(struct ifla_vf_vlan)) +
734 nla_total_size(sizeof(struct ifla_vf_tx_rate)));
735 return size;
736 } else
737 return 0;
738}
739
740static size_t rtnl_port_size(const struct net_device *dev)
741{
742 size_t port_size = nla_total_size(4) /* PORT_VF */
743 + nla_total_size(PORT_PROFILE_MAX) /* PORT_PROFILE */
744 + nla_total_size(sizeof(struct ifla_port_vsi))
745 /* PORT_VSI_TYPE */
746 + nla_total_size(PORT_UUID_MAX) /* PORT_INSTANCE_UUID */
747 + nla_total_size(PORT_UUID_MAX) /* PORT_HOST_UUID */
748 + nla_total_size(1) /* PROT_VDP_REQUEST */
749 + nla_total_size(2); /* PORT_VDP_RESPONSE */
750 size_t vf_ports_size = nla_total_size(sizeof(struct nlattr));
751 size_t vf_port_size = nla_total_size(sizeof(struct nlattr))
752 + port_size;
753 size_t port_self_size = nla_total_size(sizeof(struct nlattr))
754 + port_size;
755
756 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent)
757 return 0;
758 if (dev_num_vf(dev->dev.parent))
759 return port_self_size + vf_ports_size +
760 vf_port_size * dev_num_vf(dev->dev.parent);
761 else
762 return port_self_size;
763}
764
765static noinline size_t if_nlmsg_size(const struct net_device *dev)
766{
767 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
768 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
769 + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */
770 + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */
771 + nla_total_size(sizeof(struct rtnl_link_ifmap))
772 + nla_total_size(sizeof(struct rtnl_link_stats))
773 + nla_total_size(sizeof(struct rtnl_link_stats64))
774 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
775 + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */
776 + nla_total_size(4) /* IFLA_TXQLEN */
777 + nla_total_size(4) /* IFLA_WEIGHT */
778 + nla_total_size(4) /* IFLA_MTU */
779 + nla_total_size(4) /* IFLA_LINK */
780 + nla_total_size(4) /* IFLA_MASTER */
781 + nla_total_size(1) /* IFLA_OPERSTATE */
782 + nla_total_size(1) /* IFLA_LINKMODE */
783 + nla_total_size(4) /* IFLA_NUM_VF */
784 + rtnl_vfinfo_size(dev) /* IFLA_VFINFO_LIST */
785 + rtnl_port_size(dev) /* IFLA_VF_PORTS + IFLA_PORT_SELF */
786 + rtnl_link_get_size(dev) /* IFLA_LINKINFO */
787 + rtnl_link_get_af_size(dev); /* IFLA_AF_SPEC */
788}
789
790static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev)
791{
792 struct nlattr *vf_ports;
793 struct nlattr *vf_port;
794 int vf;
795 int err;
796
797 vf_ports = nla_nest_start(skb, IFLA_VF_PORTS);
798 if (!vf_ports)
799 return -EMSGSIZE;
800
801 for (vf = 0; vf < dev_num_vf(dev->dev.parent); vf++) {
802 vf_port = nla_nest_start(skb, IFLA_VF_PORT);
803 if (!vf_port)
804 goto nla_put_failure;
805 NLA_PUT_U32(skb, IFLA_PORT_VF, vf);
806 err = dev->netdev_ops->ndo_get_vf_port(dev, vf, skb);
807 if (err == -EMSGSIZE)
808 goto nla_put_failure;
809 if (err) {
810 nla_nest_cancel(skb, vf_port);
811 continue;
812 }
813 nla_nest_end(skb, vf_port);
814 }
815
816 nla_nest_end(skb, vf_ports);
817
818 return 0;
819
820nla_put_failure:
821 nla_nest_cancel(skb, vf_ports);
822 return -EMSGSIZE;
823}
824
825static int rtnl_port_self_fill(struct sk_buff *skb, struct net_device *dev)
826{
827 struct nlattr *port_self;
828 int err;
829
830 port_self = nla_nest_start(skb, IFLA_PORT_SELF);
831 if (!port_self)
832 return -EMSGSIZE;
833
834 err = dev->netdev_ops->ndo_get_vf_port(dev, PORT_SELF_VF, skb);
835 if (err) {
836 nla_nest_cancel(skb, port_self);
837 return (err == -EMSGSIZE) ? err : 0;
838 }
839
840 nla_nest_end(skb, port_self);
841
842 return 0;
843}
844
845static int rtnl_port_fill(struct sk_buff *skb, struct net_device *dev)
846{
847 int err;
848
849 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent)
850 return 0;
851
852 err = rtnl_port_self_fill(skb, dev);
853 if (err)
854 return err;
855
856 if (dev_num_vf(dev->dev.parent)) {
857 err = rtnl_vf_ports_fill(skb, dev);
858 if (err)
859 return err;
860 }
861
862 return 0;
863}
864
865static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
866 int type, u32 pid, u32 seq, u32 change,
867 unsigned int flags)
868{
869 struct ifinfomsg *ifm;
870 struct nlmsghdr *nlh;
871 struct rtnl_link_stats64 temp;
872 const struct rtnl_link_stats64 *stats;
873 struct nlattr *attr, *af_spec;
874 struct rtnl_af_ops *af_ops;
875
876 ASSERT_RTNL();
877 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
878 if (nlh == NULL)
879 return -EMSGSIZE;
880
881 ifm = nlmsg_data(nlh);
882 ifm->ifi_family = AF_UNSPEC;
883 ifm->__ifi_pad = 0;
884 ifm->ifi_type = dev->type;
885 ifm->ifi_index = dev->ifindex;
886 ifm->ifi_flags = dev_get_flags(dev);
887 ifm->ifi_change = change;
888
889 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
890 NLA_PUT_U32(skb, IFLA_TXQLEN, dev->tx_queue_len);
891 NLA_PUT_U8(skb, IFLA_OPERSTATE,
892 netif_running(dev) ? dev->operstate : IF_OPER_DOWN);
893 NLA_PUT_U8(skb, IFLA_LINKMODE, dev->link_mode);
894 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
895 NLA_PUT_U32(skb, IFLA_GROUP, dev->group);
896
897 if (dev->ifindex != dev->iflink)
898 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
899
900 if (dev->master)
901 NLA_PUT_U32(skb, IFLA_MASTER, dev->master->ifindex);
902
903 if (dev->qdisc)
904 NLA_PUT_STRING(skb, IFLA_QDISC, dev->qdisc->ops->id);
905
906 if (dev->ifalias)
907 NLA_PUT_STRING(skb, IFLA_IFALIAS, dev->ifalias);
908
909 if (1) {
910 struct rtnl_link_ifmap map = {
911 .mem_start = dev->mem_start,
912 .mem_end = dev->mem_end,
913 .base_addr = dev->base_addr,
914 .irq = dev->irq,
915 .dma = dev->dma,
916 .port = dev->if_port,
917 };
918 NLA_PUT(skb, IFLA_MAP, sizeof(map), &map);
919 }
920
921 if (dev->addr_len) {
922 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
923 NLA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast);
924 }
925
926 attr = nla_reserve(skb, IFLA_STATS,
927 sizeof(struct rtnl_link_stats));
928 if (attr == NULL)
929 goto nla_put_failure;
930
931 stats = dev_get_stats(dev, &temp);
932 copy_rtnl_link_stats(nla_data(attr), stats);
933
934 attr = nla_reserve(skb, IFLA_STATS64,
935 sizeof(struct rtnl_link_stats64));
936 if (attr == NULL)
937 goto nla_put_failure;
938 copy_rtnl_link_stats64(nla_data(attr), stats);
939
940 if (dev->dev.parent)
941 NLA_PUT_U32(skb, IFLA_NUM_VF, dev_num_vf(dev->dev.parent));
942
943 if (dev->netdev_ops->ndo_get_vf_config && dev->dev.parent) {
944 int i;
945
946 struct nlattr *vfinfo, *vf;
947 int num_vfs = dev_num_vf(dev->dev.parent);
948
949 vfinfo = nla_nest_start(skb, IFLA_VFINFO_LIST);
950 if (!vfinfo)
951 goto nla_put_failure;
952 for (i = 0; i < num_vfs; i++) {
953 struct ifla_vf_info ivi;
954 struct ifla_vf_mac vf_mac;
955 struct ifla_vf_vlan vf_vlan;
956 struct ifla_vf_tx_rate vf_tx_rate;
957 if (dev->netdev_ops->ndo_get_vf_config(dev, i, &ivi))
958 break;
959 vf_mac.vf = vf_vlan.vf = vf_tx_rate.vf = ivi.vf;
960 memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac));
961 vf_vlan.vlan = ivi.vlan;
962 vf_vlan.qos = ivi.qos;
963 vf_tx_rate.rate = ivi.tx_rate;
964 vf = nla_nest_start(skb, IFLA_VF_INFO);
965 if (!vf) {
966 nla_nest_cancel(skb, vfinfo);
967 goto nla_put_failure;
968 }
969 NLA_PUT(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac);
970 NLA_PUT(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan);
971 NLA_PUT(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate), &vf_tx_rate);
972 nla_nest_end(skb, vf);
973 }
974 nla_nest_end(skb, vfinfo);
975 }
976
977 if (rtnl_port_fill(skb, dev))
978 goto nla_put_failure;
979
980 if (dev->rtnl_link_ops) {
981 if (rtnl_link_fill(skb, dev) < 0)
982 goto nla_put_failure;
983 }
984
985 if (!(af_spec = nla_nest_start(skb, IFLA_AF_SPEC)))
986 goto nla_put_failure;
987
988 list_for_each_entry(af_ops, &rtnl_af_ops, list) {
989 if (af_ops->fill_link_af) {
990 struct nlattr *af;
991 int err;
992
993 if (!(af = nla_nest_start(skb, af_ops->family)))
994 goto nla_put_failure;
995
996 err = af_ops->fill_link_af(skb, dev);
997
998 /*
999 * Caller may return ENODATA to indicate that there
1000 * was no data to be dumped. This is not an error, it
1001 * means we should trim the attribute header and
1002 * continue.
1003 */
1004 if (err == -ENODATA)
1005 nla_nest_cancel(skb, af);
1006 else if (err < 0)
1007 goto nla_put_failure;
1008
1009 nla_nest_end(skb, af);
1010 }
1011 }
1012
1013 nla_nest_end(skb, af_spec);
1014
1015 return nlmsg_end(skb, nlh);
1016
1017nla_put_failure:
1018 nlmsg_cancel(skb, nlh);
1019 return -EMSGSIZE;
1020}
1021
1022static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
1023{
1024 struct net *net = sock_net(skb->sk);
1025 int h, s_h;
1026 int idx = 0, s_idx;
1027 struct net_device *dev;
1028 struct hlist_head *head;
1029 struct hlist_node *node;
1030
1031 s_h = cb->args[0];
1032 s_idx = cb->args[1];
1033
1034 rcu_read_lock();
1035 cb->seq = net->dev_base_seq;
1036
1037 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1038 idx = 0;
1039 head = &net->dev_index_head[h];
1040 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
1041 if (idx < s_idx)
1042 goto cont;
1043 if (rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK,
1044 NETLINK_CB(cb->skb).pid,
1045 cb->nlh->nlmsg_seq, 0,
1046 NLM_F_MULTI) <= 0)
1047 goto out;
1048
1049 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1050cont:
1051 idx++;
1052 }
1053 }
1054out:
1055 rcu_read_unlock();
1056 cb->args[1] = idx;
1057 cb->args[0] = h;
1058
1059 return skb->len;
1060}
1061
1062const struct nla_policy ifla_policy[IFLA_MAX+1] = {
1063 [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 },
1064 [IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1065 [IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1066 [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) },
1067 [IFLA_MTU] = { .type = NLA_U32 },
1068 [IFLA_LINK] = { .type = NLA_U32 },
1069 [IFLA_MASTER] = { .type = NLA_U32 },
1070 [IFLA_TXQLEN] = { .type = NLA_U32 },
1071 [IFLA_WEIGHT] = { .type = NLA_U32 },
1072 [IFLA_OPERSTATE] = { .type = NLA_U8 },
1073 [IFLA_LINKMODE] = { .type = NLA_U8 },
1074 [IFLA_LINKINFO] = { .type = NLA_NESTED },
1075 [IFLA_NET_NS_PID] = { .type = NLA_U32 },
1076 [IFLA_NET_NS_FD] = { .type = NLA_U32 },
1077 [IFLA_IFALIAS] = { .type = NLA_STRING, .len = IFALIASZ-1 },
1078 [IFLA_VFINFO_LIST] = {. type = NLA_NESTED },
1079 [IFLA_VF_PORTS] = { .type = NLA_NESTED },
1080 [IFLA_PORT_SELF] = { .type = NLA_NESTED },
1081 [IFLA_AF_SPEC] = { .type = NLA_NESTED },
1082};
1083EXPORT_SYMBOL(ifla_policy);
1084
1085static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
1086 [IFLA_INFO_KIND] = { .type = NLA_STRING },
1087 [IFLA_INFO_DATA] = { .type = NLA_NESTED },
1088};
1089
1090static const struct nla_policy ifla_vfinfo_policy[IFLA_VF_INFO_MAX+1] = {
1091 [IFLA_VF_INFO] = { .type = NLA_NESTED },
1092};
1093
1094static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = {
1095 [IFLA_VF_MAC] = { .type = NLA_BINARY,
1096 .len = sizeof(struct ifla_vf_mac) },
1097 [IFLA_VF_VLAN] = { .type = NLA_BINARY,
1098 .len = sizeof(struct ifla_vf_vlan) },
1099 [IFLA_VF_TX_RATE] = { .type = NLA_BINARY,
1100 .len = sizeof(struct ifla_vf_tx_rate) },
1101};
1102
1103static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = {
1104 [IFLA_PORT_VF] = { .type = NLA_U32 },
1105 [IFLA_PORT_PROFILE] = { .type = NLA_STRING,
1106 .len = PORT_PROFILE_MAX },
1107 [IFLA_PORT_VSI_TYPE] = { .type = NLA_BINARY,
1108 .len = sizeof(struct ifla_port_vsi)},
1109 [IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY,
1110 .len = PORT_UUID_MAX },
1111 [IFLA_PORT_HOST_UUID] = { .type = NLA_STRING,
1112 .len = PORT_UUID_MAX },
1113 [IFLA_PORT_REQUEST] = { .type = NLA_U8, },
1114 [IFLA_PORT_RESPONSE] = { .type = NLA_U16, },
1115};
1116
1117struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[])
1118{
1119 struct net *net;
1120 /* Examine the link attributes and figure out which
1121 * network namespace we are talking about.
1122 */
1123 if (tb[IFLA_NET_NS_PID])
1124 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID]));
1125 else if (tb[IFLA_NET_NS_FD])
1126 net = get_net_ns_by_fd(nla_get_u32(tb[IFLA_NET_NS_FD]));
1127 else
1128 net = get_net(src_net);
1129 return net;
1130}
1131EXPORT_SYMBOL(rtnl_link_get_net);
1132
1133static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[])
1134{
1135 if (dev) {
1136 if (tb[IFLA_ADDRESS] &&
1137 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
1138 return -EINVAL;
1139
1140 if (tb[IFLA_BROADCAST] &&
1141 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
1142 return -EINVAL;
1143 }
1144
1145 if (tb[IFLA_AF_SPEC]) {
1146 struct nlattr *af;
1147 int rem, err;
1148
1149 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
1150 const struct rtnl_af_ops *af_ops;
1151
1152 if (!(af_ops = rtnl_af_lookup(nla_type(af))))
1153 return -EAFNOSUPPORT;
1154
1155 if (!af_ops->set_link_af)
1156 return -EOPNOTSUPP;
1157
1158 if (af_ops->validate_link_af) {
1159 err = af_ops->validate_link_af(dev, af);
1160 if (err < 0)
1161 return err;
1162 }
1163 }
1164 }
1165
1166 return 0;
1167}
1168
1169static int do_setvfinfo(struct net_device *dev, struct nlattr *attr)
1170{
1171 int rem, err = -EINVAL;
1172 struct nlattr *vf;
1173 const struct net_device_ops *ops = dev->netdev_ops;
1174
1175 nla_for_each_nested(vf, attr, rem) {
1176 switch (nla_type(vf)) {
1177 case IFLA_VF_MAC: {
1178 struct ifla_vf_mac *ivm;
1179 ivm = nla_data(vf);
1180 err = -EOPNOTSUPP;
1181 if (ops->ndo_set_vf_mac)
1182 err = ops->ndo_set_vf_mac(dev, ivm->vf,
1183 ivm->mac);
1184 break;
1185 }
1186 case IFLA_VF_VLAN: {
1187 struct ifla_vf_vlan *ivv;
1188 ivv = nla_data(vf);
1189 err = -EOPNOTSUPP;
1190 if (ops->ndo_set_vf_vlan)
1191 err = ops->ndo_set_vf_vlan(dev, ivv->vf,
1192 ivv->vlan,
1193 ivv->qos);
1194 break;
1195 }
1196 case IFLA_VF_TX_RATE: {
1197 struct ifla_vf_tx_rate *ivt;
1198 ivt = nla_data(vf);
1199 err = -EOPNOTSUPP;
1200 if (ops->ndo_set_vf_tx_rate)
1201 err = ops->ndo_set_vf_tx_rate(dev, ivt->vf,
1202 ivt->rate);
1203 break;
1204 }
1205 default:
1206 err = -EINVAL;
1207 break;
1208 }
1209 if (err)
1210 break;
1211 }
1212 return err;
1213}
1214
1215static int do_set_master(struct net_device *dev, int ifindex)
1216{
1217 struct net_device *master_dev;
1218 const struct net_device_ops *ops;
1219 int err;
1220
1221 if (dev->master) {
1222 if (dev->master->ifindex == ifindex)
1223 return 0;
1224 ops = dev->master->netdev_ops;
1225 if (ops->ndo_del_slave) {
1226 err = ops->ndo_del_slave(dev->master, dev);
1227 if (err)
1228 return err;
1229 } else {
1230 return -EOPNOTSUPP;
1231 }
1232 }
1233
1234 if (ifindex) {
1235 master_dev = __dev_get_by_index(dev_net(dev), ifindex);
1236 if (!master_dev)
1237 return -EINVAL;
1238 ops = master_dev->netdev_ops;
1239 if (ops->ndo_add_slave) {
1240 err = ops->ndo_add_slave(master_dev, dev);
1241 if (err)
1242 return err;
1243 } else {
1244 return -EOPNOTSUPP;
1245 }
1246 }
1247 return 0;
1248}
1249
1250static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm,
1251 struct nlattr **tb, char *ifname, int modified)
1252{
1253 const struct net_device_ops *ops = dev->netdev_ops;
1254 int send_addr_notify = 0;
1255 int err;
1256
1257 if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD]) {
1258 struct net *net = rtnl_link_get_net(dev_net(dev), tb);
1259 if (IS_ERR(net)) {
1260 err = PTR_ERR(net);
1261 goto errout;
1262 }
1263 err = dev_change_net_namespace(dev, net, ifname);
1264 put_net(net);
1265 if (err)
1266 goto errout;
1267 modified = 1;
1268 }
1269
1270 if (tb[IFLA_MAP]) {
1271 struct rtnl_link_ifmap *u_map;
1272 struct ifmap k_map;
1273
1274 if (!ops->ndo_set_config) {
1275 err = -EOPNOTSUPP;
1276 goto errout;
1277 }
1278
1279 if (!netif_device_present(dev)) {
1280 err = -ENODEV;
1281 goto errout;
1282 }
1283
1284 u_map = nla_data(tb[IFLA_MAP]);
1285 k_map.mem_start = (unsigned long) u_map->mem_start;
1286 k_map.mem_end = (unsigned long) u_map->mem_end;
1287 k_map.base_addr = (unsigned short) u_map->base_addr;
1288 k_map.irq = (unsigned char) u_map->irq;
1289 k_map.dma = (unsigned char) u_map->dma;
1290 k_map.port = (unsigned char) u_map->port;
1291
1292 err = ops->ndo_set_config(dev, &k_map);
1293 if (err < 0)
1294 goto errout;
1295
1296 modified = 1;
1297 }
1298
1299 if (tb[IFLA_ADDRESS]) {
1300 struct sockaddr *sa;
1301 int len;
1302
1303 if (!ops->ndo_set_mac_address) {
1304 err = -EOPNOTSUPP;
1305 goto errout;
1306 }
1307
1308 if (!netif_device_present(dev)) {
1309 err = -ENODEV;
1310 goto errout;
1311 }
1312
1313 len = sizeof(sa_family_t) + dev->addr_len;
1314 sa = kmalloc(len, GFP_KERNEL);
1315 if (!sa) {
1316 err = -ENOMEM;
1317 goto errout;
1318 }
1319 sa->sa_family = dev->type;
1320 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
1321 dev->addr_len);
1322 err = ops->ndo_set_mac_address(dev, sa);
1323 kfree(sa);
1324 if (err)
1325 goto errout;
1326 send_addr_notify = 1;
1327 modified = 1;
1328 }
1329
1330 if (tb[IFLA_MTU]) {
1331 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1332 if (err < 0)
1333 goto errout;
1334 modified = 1;
1335 }
1336
1337 if (tb[IFLA_GROUP]) {
1338 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
1339 modified = 1;
1340 }
1341
1342 /*
1343 * Interface selected by interface index but interface
1344 * name provided implies that a name change has been
1345 * requested.
1346 */
1347 if (ifm->ifi_index > 0 && ifname[0]) {
1348 err = dev_change_name(dev, ifname);
1349 if (err < 0)
1350 goto errout;
1351 modified = 1;
1352 }
1353
1354 if (tb[IFLA_IFALIAS]) {
1355 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]),
1356 nla_len(tb[IFLA_IFALIAS]));
1357 if (err < 0)
1358 goto errout;
1359 modified = 1;
1360 }
1361
1362 if (tb[IFLA_BROADCAST]) {
1363 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
1364 send_addr_notify = 1;
1365 }
1366
1367 if (ifm->ifi_flags || ifm->ifi_change) {
1368 err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
1369 if (err < 0)
1370 goto errout;
1371 }
1372
1373 if (tb[IFLA_MASTER]) {
1374 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]));
1375 if (err)
1376 goto errout;
1377 modified = 1;
1378 }
1379
1380 if (tb[IFLA_TXQLEN])
1381 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
1382
1383 if (tb[IFLA_OPERSTATE])
1384 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
1385
1386 if (tb[IFLA_LINKMODE]) {
1387 write_lock_bh(&dev_base_lock);
1388 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
1389 write_unlock_bh(&dev_base_lock);
1390 }
1391
1392 if (tb[IFLA_VFINFO_LIST]) {
1393 struct nlattr *attr;
1394 int rem;
1395 nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) {
1396 if (nla_type(attr) != IFLA_VF_INFO) {
1397 err = -EINVAL;
1398 goto errout;
1399 }
1400 err = do_setvfinfo(dev, attr);
1401 if (err < 0)
1402 goto errout;
1403 modified = 1;
1404 }
1405 }
1406 err = 0;
1407
1408 if (tb[IFLA_VF_PORTS]) {
1409 struct nlattr *port[IFLA_PORT_MAX+1];
1410 struct nlattr *attr;
1411 int vf;
1412 int rem;
1413
1414 err = -EOPNOTSUPP;
1415 if (!ops->ndo_set_vf_port)
1416 goto errout;
1417
1418 nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) {
1419 if (nla_type(attr) != IFLA_VF_PORT)
1420 continue;
1421 err = nla_parse_nested(port, IFLA_PORT_MAX,
1422 attr, ifla_port_policy);
1423 if (err < 0)
1424 goto errout;
1425 if (!port[IFLA_PORT_VF]) {
1426 err = -EOPNOTSUPP;
1427 goto errout;
1428 }
1429 vf = nla_get_u32(port[IFLA_PORT_VF]);
1430 err = ops->ndo_set_vf_port(dev, vf, port);
1431 if (err < 0)
1432 goto errout;
1433 modified = 1;
1434 }
1435 }
1436 err = 0;
1437
1438 if (tb[IFLA_PORT_SELF]) {
1439 struct nlattr *port[IFLA_PORT_MAX+1];
1440
1441 err = nla_parse_nested(port, IFLA_PORT_MAX,
1442 tb[IFLA_PORT_SELF], ifla_port_policy);
1443 if (err < 0)
1444 goto errout;
1445
1446 err = -EOPNOTSUPP;
1447 if (ops->ndo_set_vf_port)
1448 err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port);
1449 if (err < 0)
1450 goto errout;
1451 modified = 1;
1452 }
1453
1454 if (tb[IFLA_AF_SPEC]) {
1455 struct nlattr *af;
1456 int rem;
1457
1458 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
1459 const struct rtnl_af_ops *af_ops;
1460
1461 if (!(af_ops = rtnl_af_lookup(nla_type(af))))
1462 BUG();
1463
1464 err = af_ops->set_link_af(dev, af);
1465 if (err < 0)
1466 goto errout;
1467
1468 modified = 1;
1469 }
1470 }
1471 err = 0;
1472
1473errout:
1474 if (err < 0 && modified && net_ratelimit())
1475 printk(KERN_WARNING "A link change request failed with "
1476 "some changes committed already. Interface %s may "
1477 "have been left with an inconsistent configuration, "
1478 "please check.\n", dev->name);
1479
1480 if (send_addr_notify)
1481 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
1482 return err;
1483}
1484
1485static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
1486{
1487 struct net *net = sock_net(skb->sk);
1488 struct ifinfomsg *ifm;
1489 struct net_device *dev;
1490 int err;
1491 struct nlattr *tb[IFLA_MAX+1];
1492 char ifname[IFNAMSIZ];
1493
1494 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1495 if (err < 0)
1496 goto errout;
1497
1498 if (tb[IFLA_IFNAME])
1499 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1500 else
1501 ifname[0] = '\0';
1502
1503 err = -EINVAL;
1504 ifm = nlmsg_data(nlh);
1505 if (ifm->ifi_index > 0)
1506 dev = __dev_get_by_index(net, ifm->ifi_index);
1507 else if (tb[IFLA_IFNAME])
1508 dev = __dev_get_by_name(net, ifname);
1509 else
1510 goto errout;
1511
1512 if (dev == NULL) {
1513 err = -ENODEV;
1514 goto errout;
1515 }
1516
1517 err = validate_linkmsg(dev, tb);
1518 if (err < 0)
1519 goto errout;
1520
1521 err = do_setlink(dev, ifm, tb, ifname, 0);
1522errout:
1523 return err;
1524}
1525
1526static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
1527{
1528 struct net *net = sock_net(skb->sk);
1529 const struct rtnl_link_ops *ops;
1530 struct net_device *dev;
1531 struct ifinfomsg *ifm;
1532 char ifname[IFNAMSIZ];
1533 struct nlattr *tb[IFLA_MAX+1];
1534 int err;
1535 LIST_HEAD(list_kill);
1536
1537 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1538 if (err < 0)
1539 return err;
1540
1541 if (tb[IFLA_IFNAME])
1542 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1543
1544 ifm = nlmsg_data(nlh);
1545 if (ifm->ifi_index > 0)
1546 dev = __dev_get_by_index(net, ifm->ifi_index);
1547 else if (tb[IFLA_IFNAME])
1548 dev = __dev_get_by_name(net, ifname);
1549 else
1550 return -EINVAL;
1551
1552 if (!dev)
1553 return -ENODEV;
1554
1555 ops = dev->rtnl_link_ops;
1556 if (!ops)
1557 return -EOPNOTSUPP;
1558
1559 ops->dellink(dev, &list_kill);
1560 unregister_netdevice_many(&list_kill);
1561 list_del(&list_kill);
1562 return 0;
1563}
1564
1565int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm)
1566{
1567 unsigned int old_flags;
1568 int err;
1569
1570 old_flags = dev->flags;
1571 if (ifm && (ifm->ifi_flags || ifm->ifi_change)) {
1572 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
1573 if (err < 0)
1574 return err;
1575 }
1576
1577 dev->rtnl_link_state = RTNL_LINK_INITIALIZED;
1578 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
1579
1580 __dev_notify_flags(dev, old_flags);
1581 return 0;
1582}
1583EXPORT_SYMBOL(rtnl_configure_link);
1584
1585struct net_device *rtnl_create_link(struct net *src_net, struct net *net,
1586 char *ifname, const struct rtnl_link_ops *ops, struct nlattr *tb[])
1587{
1588 int err;
1589 struct net_device *dev;
1590 unsigned int num_queues = 1;
1591 unsigned int real_num_queues = 1;
1592
1593 if (ops->get_tx_queues) {
1594 err = ops->get_tx_queues(src_net, tb, &num_queues,
1595 &real_num_queues);
1596 if (err)
1597 goto err;
1598 }
1599 err = -ENOMEM;
1600 dev = alloc_netdev_mq(ops->priv_size, ifname, ops->setup, num_queues);
1601 if (!dev)
1602 goto err;
1603
1604 dev_net_set(dev, net);
1605 dev->rtnl_link_ops = ops;
1606 dev->rtnl_link_state = RTNL_LINK_INITIALIZING;
1607 dev->real_num_tx_queues = real_num_queues;
1608
1609 if (tb[IFLA_MTU])
1610 dev->mtu = nla_get_u32(tb[IFLA_MTU]);
1611 if (tb[IFLA_ADDRESS])
1612 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]),
1613 nla_len(tb[IFLA_ADDRESS]));
1614 if (tb[IFLA_BROADCAST])
1615 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]),
1616 nla_len(tb[IFLA_BROADCAST]));
1617 if (tb[IFLA_TXQLEN])
1618 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
1619 if (tb[IFLA_OPERSTATE])
1620 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
1621 if (tb[IFLA_LINKMODE])
1622 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
1623 if (tb[IFLA_GROUP])
1624 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
1625
1626 return dev;
1627
1628err:
1629 return ERR_PTR(err);
1630}
1631EXPORT_SYMBOL(rtnl_create_link);
1632
1633static int rtnl_group_changelink(struct net *net, int group,
1634 struct ifinfomsg *ifm,
1635 struct nlattr **tb)
1636{
1637 struct net_device *dev;
1638 int err;
1639
1640 for_each_netdev(net, dev) {
1641 if (dev->group == group) {
1642 err = do_setlink(dev, ifm, tb, NULL, 0);
1643 if (err < 0)
1644 return err;
1645 }
1646 }
1647
1648 return 0;
1649}
1650
1651static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
1652{
1653 struct net *net = sock_net(skb->sk);
1654 const struct rtnl_link_ops *ops;
1655 struct net_device *dev;
1656 struct ifinfomsg *ifm;
1657 char kind[MODULE_NAME_LEN];
1658 char ifname[IFNAMSIZ];
1659 struct nlattr *tb[IFLA_MAX+1];
1660 struct nlattr *linkinfo[IFLA_INFO_MAX+1];
1661 int err;
1662
1663#ifdef CONFIG_MODULES
1664replay:
1665#endif
1666 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1667 if (err < 0)
1668 return err;
1669
1670 if (tb[IFLA_IFNAME])
1671 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1672 else
1673 ifname[0] = '\0';
1674
1675 ifm = nlmsg_data(nlh);
1676 if (ifm->ifi_index > 0)
1677 dev = __dev_get_by_index(net, ifm->ifi_index);
1678 else {
1679 if (ifname[0])
1680 dev = __dev_get_by_name(net, ifname);
1681 else
1682 dev = NULL;
1683 }
1684
1685 err = validate_linkmsg(dev, tb);
1686 if (err < 0)
1687 return err;
1688
1689 if (tb[IFLA_LINKINFO]) {
1690 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX,
1691 tb[IFLA_LINKINFO], ifla_info_policy);
1692 if (err < 0)
1693 return err;
1694 } else
1695 memset(linkinfo, 0, sizeof(linkinfo));
1696
1697 if (linkinfo[IFLA_INFO_KIND]) {
1698 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind));
1699 ops = rtnl_link_ops_get(kind);
1700 } else {
1701 kind[0] = '\0';
1702 ops = NULL;
1703 }
1704
1705 if (1) {
1706 struct nlattr *attr[ops ? ops->maxtype + 1 : 0], **data = NULL;
1707 struct net *dest_net;
1708
1709 if (ops) {
1710 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
1711 err = nla_parse_nested(attr, ops->maxtype,
1712 linkinfo[IFLA_INFO_DATA],
1713 ops->policy);
1714 if (err < 0)
1715 return err;
1716 data = attr;
1717 }
1718 if (ops->validate) {
1719 err = ops->validate(tb, data);
1720 if (err < 0)
1721 return err;
1722 }
1723 }
1724
1725 if (dev) {
1726 int modified = 0;
1727
1728 if (nlh->nlmsg_flags & NLM_F_EXCL)
1729 return -EEXIST;
1730 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1731 return -EOPNOTSUPP;
1732
1733 if (linkinfo[IFLA_INFO_DATA]) {
1734 if (!ops || ops != dev->rtnl_link_ops ||
1735 !ops->changelink)
1736 return -EOPNOTSUPP;
1737
1738 err = ops->changelink(dev, tb, data);
1739 if (err < 0)
1740 return err;
1741 modified = 1;
1742 }
1743
1744 return do_setlink(dev, ifm, tb, ifname, modified);
1745 }
1746
1747 if (!(nlh->nlmsg_flags & NLM_F_CREATE)) {
1748 if (ifm->ifi_index == 0 && tb[IFLA_GROUP])
1749 return rtnl_group_changelink(net,
1750 nla_get_u32(tb[IFLA_GROUP]),
1751 ifm, tb);
1752 return -ENODEV;
1753 }
1754
1755 if (ifm->ifi_index)
1756 return -EOPNOTSUPP;
1757 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO])
1758 return -EOPNOTSUPP;
1759
1760 if (!ops) {
1761#ifdef CONFIG_MODULES
1762 if (kind[0]) {
1763 __rtnl_unlock();
1764 request_module("rtnl-link-%s", kind);
1765 rtnl_lock();
1766 ops = rtnl_link_ops_get(kind);
1767 if (ops)
1768 goto replay;
1769 }
1770#endif
1771 return -EOPNOTSUPP;
1772 }
1773
1774 if (!ifname[0])
1775 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
1776
1777 dest_net = rtnl_link_get_net(net, tb);
1778 if (IS_ERR(dest_net))
1779 return PTR_ERR(dest_net);
1780
1781 dev = rtnl_create_link(net, dest_net, ifname, ops, tb);
1782
1783 if (IS_ERR(dev))
1784 err = PTR_ERR(dev);
1785 else if (ops->newlink)
1786 err = ops->newlink(net, dev, tb, data);
1787 else
1788 err = register_netdevice(dev);
1789
1790 if (err < 0 && !IS_ERR(dev))
1791 free_netdev(dev);
1792 if (err < 0)
1793 goto out;
1794
1795 err = rtnl_configure_link(dev, ifm);
1796 if (err < 0)
1797 unregister_netdevice(dev);
1798out:
1799 put_net(dest_net);
1800 return err;
1801 }
1802}
1803
1804static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
1805{
1806 struct net *net = sock_net(skb->sk);
1807 struct ifinfomsg *ifm;
1808 char ifname[IFNAMSIZ];
1809 struct nlattr *tb[IFLA_MAX+1];
1810 struct net_device *dev = NULL;
1811 struct sk_buff *nskb;
1812 int err;
1813
1814 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1815 if (err < 0)
1816 return err;
1817
1818 if (tb[IFLA_IFNAME])
1819 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1820
1821 ifm = nlmsg_data(nlh);
1822 if (ifm->ifi_index > 0)
1823 dev = __dev_get_by_index(net, ifm->ifi_index);
1824 else if (tb[IFLA_IFNAME])
1825 dev = __dev_get_by_name(net, ifname);
1826 else
1827 return -EINVAL;
1828
1829 if (dev == NULL)
1830 return -ENODEV;
1831
1832 nskb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL);
1833 if (nskb == NULL)
1834 return -ENOBUFS;
1835
1836 err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).pid,
1837 nlh->nlmsg_seq, 0, 0);
1838 if (err < 0) {
1839 /* -EMSGSIZE implies BUG in if_nlmsg_size */
1840 WARN_ON(err == -EMSGSIZE);
1841 kfree_skb(nskb);
1842 } else
1843 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).pid);
1844
1845 return err;
1846}
1847
1848static u16 rtnl_calcit(struct sk_buff *skb)
1849{
1850 return min_ifinfo_dump_size;
1851}
1852
1853static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
1854{
1855 int idx;
1856 int s_idx = cb->family;
1857
1858 if (s_idx == 0)
1859 s_idx = 1;
1860 for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) {
1861 int type = cb->nlh->nlmsg_type-RTM_BASE;
1862 if (idx < s_idx || idx == PF_PACKET)
1863 continue;
1864 if (rtnl_msg_handlers[idx] == NULL ||
1865 rtnl_msg_handlers[idx][type].dumpit == NULL)
1866 continue;
1867 if (idx > s_idx)
1868 memset(&cb->args[0], 0, sizeof(cb->args));
1869 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb))
1870 break;
1871 }
1872 cb->family = idx;
1873
1874 return skb->len;
1875}
1876
1877void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change)
1878{
1879 struct net *net = dev_net(dev);
1880 struct sk_buff *skb;
1881 int err = -ENOBUFS;
1882 size_t if_info_size;
1883
1884 skb = nlmsg_new((if_info_size = if_nlmsg_size(dev)), GFP_KERNEL);
1885 if (skb == NULL)
1886 goto errout;
1887
1888 min_ifinfo_dump_size = max_t(u16, if_info_size, min_ifinfo_dump_size);
1889
1890 err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0);
1891 if (err < 0) {
1892 /* -EMSGSIZE implies BUG in if_nlmsg_size() */
1893 WARN_ON(err == -EMSGSIZE);
1894 kfree_skb(skb);
1895 goto errout;
1896 }
1897 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_KERNEL);
1898 return;
1899errout:
1900 if (err < 0)
1901 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
1902}
1903
1904/* Protected by RTNL sempahore. */
1905static struct rtattr **rta_buf;
1906static int rtattr_max;
1907
1908/* Process one rtnetlink message. */
1909
1910static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
1911{
1912 struct net *net = sock_net(skb->sk);
1913 rtnl_doit_func doit;
1914 int sz_idx, kind;
1915 int min_len;
1916 int family;
1917 int type;
1918 int err;
1919
1920 type = nlh->nlmsg_type;
1921 if (type > RTM_MAX)
1922 return -EOPNOTSUPP;
1923
1924 type -= RTM_BASE;
1925
1926 /* All the messages must have at least 1 byte length */
1927 if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg)))
1928 return 0;
1929
1930 family = ((struct rtgenmsg *)NLMSG_DATA(nlh))->rtgen_family;
1931 sz_idx = type>>2;
1932 kind = type&3;
1933
1934 if (kind != 2 && security_netlink_recv(skb, CAP_NET_ADMIN))
1935 return -EPERM;
1936
1937 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
1938 struct sock *rtnl;
1939 rtnl_dumpit_func dumpit;
1940 rtnl_calcit_func calcit;
1941 u16 min_dump_alloc = 0;
1942
1943 dumpit = rtnl_get_dumpit(family, type);
1944 if (dumpit == NULL)
1945 return -EOPNOTSUPP;
1946 calcit = rtnl_get_calcit(family, type);
1947 if (calcit)
1948 min_dump_alloc = calcit(skb);
1949
1950 __rtnl_unlock();
1951 rtnl = net->rtnl;
1952 err = netlink_dump_start(rtnl, skb, nlh, dumpit,
1953 NULL, min_dump_alloc);
1954 rtnl_lock();
1955 return err;
1956 }
1957
1958 memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *)));
1959
1960 min_len = rtm_min[sz_idx];
1961 if (nlh->nlmsg_len < min_len)
1962 return -EINVAL;
1963
1964 if (nlh->nlmsg_len > min_len) {
1965 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
1966 struct rtattr *attr = (void *)nlh + NLMSG_ALIGN(min_len);
1967
1968 while (RTA_OK(attr, attrlen)) {
1969 unsigned flavor = attr->rta_type;
1970 if (flavor) {
1971 if (flavor > rta_max[sz_idx])
1972 return -EINVAL;
1973 rta_buf[flavor-1] = attr;
1974 }
1975 attr = RTA_NEXT(attr, attrlen);
1976 }
1977 }
1978
1979 doit = rtnl_get_doit(family, type);
1980 if (doit == NULL)
1981 return -EOPNOTSUPP;
1982
1983 return doit(skb, nlh, (void *)&rta_buf[0]);
1984}
1985
1986static void rtnetlink_rcv(struct sk_buff *skb)
1987{
1988 rtnl_lock();
1989 netlink_rcv_skb(skb, &rtnetlink_rcv_msg);
1990 rtnl_unlock();
1991}
1992
1993static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
1994{
1995 struct net_device *dev = ptr;
1996
1997 switch (event) {
1998 case NETDEV_UP:
1999 case NETDEV_DOWN:
2000 case NETDEV_PRE_UP:
2001 case NETDEV_POST_INIT:
2002 case NETDEV_REGISTER:
2003 case NETDEV_CHANGE:
2004 case NETDEV_PRE_TYPE_CHANGE:
2005 case NETDEV_GOING_DOWN:
2006 case NETDEV_UNREGISTER:
2007 case NETDEV_UNREGISTER_BATCH:
2008 case NETDEV_RELEASE:
2009 case NETDEV_JOIN:
2010 break;
2011 default:
2012 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
2013 break;
2014 }
2015 return NOTIFY_DONE;
2016}
2017
2018static struct notifier_block rtnetlink_dev_notifier = {
2019 .notifier_call = rtnetlink_event,
2020};
2021
2022
2023static int __net_init rtnetlink_net_init(struct net *net)
2024{
2025 struct sock *sk;
2026 sk = netlink_kernel_create(net, NETLINK_ROUTE, RTNLGRP_MAX,
2027 rtnetlink_rcv, &rtnl_mutex, THIS_MODULE);
2028 if (!sk)
2029 return -ENOMEM;
2030 net->rtnl = sk;
2031 return 0;
2032}
2033
2034static void __net_exit rtnetlink_net_exit(struct net *net)
2035{
2036 netlink_kernel_release(net->rtnl);
2037 net->rtnl = NULL;
2038}
2039
2040static struct pernet_operations rtnetlink_net_ops = {
2041 .init = rtnetlink_net_init,
2042 .exit = rtnetlink_net_exit,
2043};
2044
2045void __init rtnetlink_init(void)
2046{
2047 int i;
2048
2049 rtattr_max = 0;
2050 for (i = 0; i < ARRAY_SIZE(rta_max); i++)
2051 if (rta_max[i] > rtattr_max)
2052 rtattr_max = rta_max[i];
2053 rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL);
2054 if (!rta_buf)
2055 panic("rtnetlink_init: cannot allocate rta_buf\n");
2056
2057 if (register_pernet_subsys(&rtnetlink_net_ops))
2058 panic("rtnetlink_init: cannot initialize rtnetlink\n");
2059
2060 netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV);
2061 register_netdevice_notifier(&rtnetlink_dev_notifier);
2062
2063 rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink,
2064 rtnl_dump_ifinfo, rtnl_calcit);
2065 rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, NULL);
2066 rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, NULL);
2067 rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, NULL);
2068
2069 rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, NULL);
2070 rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, NULL);
2071}
2072
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/bitops.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/timer.h>
26#include <linux/string.h>
27#include <linux/sockios.h>
28#include <linux/net.h>
29#include <linux/fcntl.h>
30#include <linux/mm.h>
31#include <linux/slab.h>
32#include <linux/interrupt.h>
33#include <linux/capability.h>
34#include <linux/skbuff.h>
35#include <linux/init.h>
36#include <linux/security.h>
37#include <linux/mutex.h>
38#include <linux/if_addr.h>
39#include <linux/if_bridge.h>
40#include <linux/if_vlan.h>
41#include <linux/pci.h>
42#include <linux/etherdevice.h>
43#include <linux/bpf.h>
44
45#include <linux/uaccess.h>
46
47#include <linux/inet.h>
48#include <linux/netdevice.h>
49#include <net/switchdev.h>
50#include <net/ip.h>
51#include <net/protocol.h>
52#include <net/arp.h>
53#include <net/route.h>
54#include <net/udp.h>
55#include <net/tcp.h>
56#include <net/sock.h>
57#include <net/pkt_sched.h>
58#include <net/fib_rules.h>
59#include <net/rtnetlink.h>
60#include <net/net_namespace.h>
61
62struct rtnl_link {
63 rtnl_doit_func doit;
64 rtnl_dumpit_func dumpit;
65 struct module *owner;
66 unsigned int flags;
67 struct rcu_head rcu;
68};
69
70static DEFINE_MUTEX(rtnl_mutex);
71
72void rtnl_lock(void)
73{
74 mutex_lock(&rtnl_mutex);
75}
76EXPORT_SYMBOL(rtnl_lock);
77
78int rtnl_lock_killable(void)
79{
80 return mutex_lock_killable(&rtnl_mutex);
81}
82EXPORT_SYMBOL(rtnl_lock_killable);
83
84static struct sk_buff *defer_kfree_skb_list;
85void rtnl_kfree_skbs(struct sk_buff *head, struct sk_buff *tail)
86{
87 if (head && tail) {
88 tail->next = defer_kfree_skb_list;
89 defer_kfree_skb_list = head;
90 }
91}
92EXPORT_SYMBOL(rtnl_kfree_skbs);
93
94void __rtnl_unlock(void)
95{
96 struct sk_buff *head = defer_kfree_skb_list;
97
98 defer_kfree_skb_list = NULL;
99
100 mutex_unlock(&rtnl_mutex);
101
102 while (head) {
103 struct sk_buff *next = head->next;
104
105 kfree_skb(head);
106 cond_resched();
107 head = next;
108 }
109}
110
111void rtnl_unlock(void)
112{
113 /* This fellow will unlock it for us. */
114 netdev_run_todo();
115}
116EXPORT_SYMBOL(rtnl_unlock);
117
118int rtnl_trylock(void)
119{
120 return mutex_trylock(&rtnl_mutex);
121}
122EXPORT_SYMBOL(rtnl_trylock);
123
124int rtnl_is_locked(void)
125{
126 return mutex_is_locked(&rtnl_mutex);
127}
128EXPORT_SYMBOL(rtnl_is_locked);
129
130#ifdef CONFIG_PROVE_LOCKING
131bool lockdep_rtnl_is_held(void)
132{
133 return lockdep_is_held(&rtnl_mutex);
134}
135EXPORT_SYMBOL(lockdep_rtnl_is_held);
136#endif /* #ifdef CONFIG_PROVE_LOCKING */
137
138static struct rtnl_link *__rcu *rtnl_msg_handlers[RTNL_FAMILY_MAX + 1];
139
140static inline int rtm_msgindex(int msgtype)
141{
142 int msgindex = msgtype - RTM_BASE;
143
144 /*
145 * msgindex < 0 implies someone tried to register a netlink
146 * control code. msgindex >= RTM_NR_MSGTYPES may indicate that
147 * the message type has not been added to linux/rtnetlink.h
148 */
149 BUG_ON(msgindex < 0 || msgindex >= RTM_NR_MSGTYPES);
150
151 return msgindex;
152}
153
154static struct rtnl_link *rtnl_get_link(int protocol, int msgtype)
155{
156 struct rtnl_link **tab;
157
158 if (protocol >= ARRAY_SIZE(rtnl_msg_handlers))
159 protocol = PF_UNSPEC;
160
161 tab = rcu_dereference_rtnl(rtnl_msg_handlers[protocol]);
162 if (!tab)
163 tab = rcu_dereference_rtnl(rtnl_msg_handlers[PF_UNSPEC]);
164
165 return tab[msgtype];
166}
167
168static int rtnl_register_internal(struct module *owner,
169 int protocol, int msgtype,
170 rtnl_doit_func doit, rtnl_dumpit_func dumpit,
171 unsigned int flags)
172{
173 struct rtnl_link *link, *old;
174 struct rtnl_link __rcu **tab;
175 int msgindex;
176 int ret = -ENOBUFS;
177
178 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
179 msgindex = rtm_msgindex(msgtype);
180
181 rtnl_lock();
182 tab = rtnl_msg_handlers[protocol];
183 if (tab == NULL) {
184 tab = kcalloc(RTM_NR_MSGTYPES, sizeof(void *), GFP_KERNEL);
185 if (!tab)
186 goto unlock;
187
188 /* ensures we see the 0 stores */
189 rcu_assign_pointer(rtnl_msg_handlers[protocol], tab);
190 }
191
192 old = rtnl_dereference(tab[msgindex]);
193 if (old) {
194 link = kmemdup(old, sizeof(*old), GFP_KERNEL);
195 if (!link)
196 goto unlock;
197 } else {
198 link = kzalloc(sizeof(*link), GFP_KERNEL);
199 if (!link)
200 goto unlock;
201 }
202
203 WARN_ON(link->owner && link->owner != owner);
204 link->owner = owner;
205
206 WARN_ON(doit && link->doit && link->doit != doit);
207 if (doit)
208 link->doit = doit;
209 WARN_ON(dumpit && link->dumpit && link->dumpit != dumpit);
210 if (dumpit)
211 link->dumpit = dumpit;
212
213 link->flags |= flags;
214
215 /* publish protocol:msgtype */
216 rcu_assign_pointer(tab[msgindex], link);
217 ret = 0;
218 if (old)
219 kfree_rcu(old, rcu);
220unlock:
221 rtnl_unlock();
222 return ret;
223}
224
225/**
226 * rtnl_register_module - Register a rtnetlink message type
227 *
228 * @owner: module registering the hook (THIS_MODULE)
229 * @protocol: Protocol family or PF_UNSPEC
230 * @msgtype: rtnetlink message type
231 * @doit: Function pointer called for each request message
232 * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message
233 * @flags: rtnl_link_flags to modifiy behaviour of doit/dumpit functions
234 *
235 * Like rtnl_register, but for use by removable modules.
236 */
237int rtnl_register_module(struct module *owner,
238 int protocol, int msgtype,
239 rtnl_doit_func doit, rtnl_dumpit_func dumpit,
240 unsigned int flags)
241{
242 return rtnl_register_internal(owner, protocol, msgtype,
243 doit, dumpit, flags);
244}
245EXPORT_SYMBOL_GPL(rtnl_register_module);
246
247/**
248 * rtnl_register - Register a rtnetlink message type
249 * @protocol: Protocol family or PF_UNSPEC
250 * @msgtype: rtnetlink message type
251 * @doit: Function pointer called for each request message
252 * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message
253 * @flags: rtnl_link_flags to modifiy behaviour of doit/dumpit functions
254 *
255 * Registers the specified function pointers (at least one of them has
256 * to be non-NULL) to be called whenever a request message for the
257 * specified protocol family and message type is received.
258 *
259 * The special protocol family PF_UNSPEC may be used to define fallback
260 * function pointers for the case when no entry for the specific protocol
261 * family exists.
262 */
263void rtnl_register(int protocol, int msgtype,
264 rtnl_doit_func doit, rtnl_dumpit_func dumpit,
265 unsigned int flags)
266{
267 int err;
268
269 err = rtnl_register_internal(NULL, protocol, msgtype, doit, dumpit,
270 flags);
271 if (err)
272 pr_err("Unable to register rtnetlink message handler, "
273 "protocol = %d, message type = %d\n", protocol, msgtype);
274}
275
276/**
277 * rtnl_unregister - Unregister a rtnetlink message type
278 * @protocol: Protocol family or PF_UNSPEC
279 * @msgtype: rtnetlink message type
280 *
281 * Returns 0 on success or a negative error code.
282 */
283int rtnl_unregister(int protocol, int msgtype)
284{
285 struct rtnl_link **tab, *link;
286 int msgindex;
287
288 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
289 msgindex = rtm_msgindex(msgtype);
290
291 rtnl_lock();
292 tab = rtnl_dereference(rtnl_msg_handlers[protocol]);
293 if (!tab) {
294 rtnl_unlock();
295 return -ENOENT;
296 }
297
298 link = tab[msgindex];
299 rcu_assign_pointer(tab[msgindex], NULL);
300 rtnl_unlock();
301
302 kfree_rcu(link, rcu);
303
304 return 0;
305}
306EXPORT_SYMBOL_GPL(rtnl_unregister);
307
308/**
309 * rtnl_unregister_all - Unregister all rtnetlink message type of a protocol
310 * @protocol : Protocol family or PF_UNSPEC
311 *
312 * Identical to calling rtnl_unregster() for all registered message types
313 * of a certain protocol family.
314 */
315void rtnl_unregister_all(int protocol)
316{
317 struct rtnl_link **tab, *link;
318 int msgindex;
319
320 BUG_ON(protocol < 0 || protocol > RTNL_FAMILY_MAX);
321
322 rtnl_lock();
323 tab = rtnl_msg_handlers[protocol];
324 RCU_INIT_POINTER(rtnl_msg_handlers[protocol], NULL);
325 for (msgindex = 0; msgindex < RTM_NR_MSGTYPES; msgindex++) {
326 link = tab[msgindex];
327 if (!link)
328 continue;
329
330 rcu_assign_pointer(tab[msgindex], NULL);
331 kfree_rcu(link, rcu);
332 }
333 rtnl_unlock();
334
335 synchronize_net();
336
337 kfree(tab);
338}
339EXPORT_SYMBOL_GPL(rtnl_unregister_all);
340
341static LIST_HEAD(link_ops);
342
343static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind)
344{
345 const struct rtnl_link_ops *ops;
346
347 list_for_each_entry(ops, &link_ops, list) {
348 if (!strcmp(ops->kind, kind))
349 return ops;
350 }
351 return NULL;
352}
353
354/**
355 * __rtnl_link_register - Register rtnl_link_ops with rtnetlink.
356 * @ops: struct rtnl_link_ops * to register
357 *
358 * The caller must hold the rtnl_mutex. This function should be used
359 * by drivers that create devices during module initialization. It
360 * must be called before registering the devices.
361 *
362 * Returns 0 on success or a negative error code.
363 */
364int __rtnl_link_register(struct rtnl_link_ops *ops)
365{
366 if (rtnl_link_ops_get(ops->kind))
367 return -EEXIST;
368
369 /* The check for setup is here because if ops
370 * does not have that filled up, it is not possible
371 * to use the ops for creating device. So do not
372 * fill up dellink as well. That disables rtnl_dellink.
373 */
374 if (ops->setup && !ops->dellink)
375 ops->dellink = unregister_netdevice_queue;
376
377 list_add_tail(&ops->list, &link_ops);
378 return 0;
379}
380EXPORT_SYMBOL_GPL(__rtnl_link_register);
381
382/**
383 * rtnl_link_register - Register rtnl_link_ops with rtnetlink.
384 * @ops: struct rtnl_link_ops * to register
385 *
386 * Returns 0 on success or a negative error code.
387 */
388int rtnl_link_register(struct rtnl_link_ops *ops)
389{
390 int err;
391
392 rtnl_lock();
393 err = __rtnl_link_register(ops);
394 rtnl_unlock();
395 return err;
396}
397EXPORT_SYMBOL_GPL(rtnl_link_register);
398
399static void __rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops)
400{
401 struct net_device *dev;
402 LIST_HEAD(list_kill);
403
404 for_each_netdev(net, dev) {
405 if (dev->rtnl_link_ops == ops)
406 ops->dellink(dev, &list_kill);
407 }
408 unregister_netdevice_many(&list_kill);
409}
410
411/**
412 * __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
413 * @ops: struct rtnl_link_ops * to unregister
414 *
415 * The caller must hold the rtnl_mutex and guarantee net_namespace_list
416 * integrity (hold pernet_ops_rwsem for writing to close the race
417 * with setup_net() and cleanup_net()).
418 */
419void __rtnl_link_unregister(struct rtnl_link_ops *ops)
420{
421 struct net *net;
422
423 for_each_net(net) {
424 __rtnl_kill_links(net, ops);
425 }
426 list_del(&ops->list);
427}
428EXPORT_SYMBOL_GPL(__rtnl_link_unregister);
429
430/* Return with the rtnl_lock held when there are no network
431 * devices unregistering in any network namespace.
432 */
433static void rtnl_lock_unregistering_all(void)
434{
435 struct net *net;
436 bool unregistering;
437 DEFINE_WAIT_FUNC(wait, woken_wake_function);
438
439 add_wait_queue(&netdev_unregistering_wq, &wait);
440 for (;;) {
441 unregistering = false;
442 rtnl_lock();
443 /* We held write locked pernet_ops_rwsem, and parallel
444 * setup_net() and cleanup_net() are not possible.
445 */
446 for_each_net(net) {
447 if (net->dev_unreg_count > 0) {
448 unregistering = true;
449 break;
450 }
451 }
452 if (!unregistering)
453 break;
454 __rtnl_unlock();
455
456 wait_woken(&wait, TASK_UNINTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT);
457 }
458 remove_wait_queue(&netdev_unregistering_wq, &wait);
459}
460
461/**
462 * rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
463 * @ops: struct rtnl_link_ops * to unregister
464 */
465void rtnl_link_unregister(struct rtnl_link_ops *ops)
466{
467 /* Close the race with setup_net() and cleanup_net() */
468 down_write(&pernet_ops_rwsem);
469 rtnl_lock_unregistering_all();
470 __rtnl_link_unregister(ops);
471 rtnl_unlock();
472 up_write(&pernet_ops_rwsem);
473}
474EXPORT_SYMBOL_GPL(rtnl_link_unregister);
475
476static size_t rtnl_link_get_slave_info_data_size(const struct net_device *dev)
477{
478 struct net_device *master_dev;
479 const struct rtnl_link_ops *ops;
480 size_t size = 0;
481
482 rcu_read_lock();
483
484 master_dev = netdev_master_upper_dev_get_rcu((struct net_device *)dev);
485 if (!master_dev)
486 goto out;
487
488 ops = master_dev->rtnl_link_ops;
489 if (!ops || !ops->get_slave_size)
490 goto out;
491 /* IFLA_INFO_SLAVE_DATA + nested data */
492 size = nla_total_size(sizeof(struct nlattr)) +
493 ops->get_slave_size(master_dev, dev);
494
495out:
496 rcu_read_unlock();
497 return size;
498}
499
500static size_t rtnl_link_get_size(const struct net_device *dev)
501{
502 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
503 size_t size;
504
505 if (!ops)
506 return 0;
507
508 size = nla_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */
509 nla_total_size(strlen(ops->kind) + 1); /* IFLA_INFO_KIND */
510
511 if (ops->get_size)
512 /* IFLA_INFO_DATA + nested data */
513 size += nla_total_size(sizeof(struct nlattr)) +
514 ops->get_size(dev);
515
516 if (ops->get_xstats_size)
517 /* IFLA_INFO_XSTATS */
518 size += nla_total_size(ops->get_xstats_size(dev));
519
520 size += rtnl_link_get_slave_info_data_size(dev);
521
522 return size;
523}
524
525static LIST_HEAD(rtnl_af_ops);
526
527static const struct rtnl_af_ops *rtnl_af_lookup(const int family)
528{
529 const struct rtnl_af_ops *ops;
530
531 list_for_each_entry_rcu(ops, &rtnl_af_ops, list) {
532 if (ops->family == family)
533 return ops;
534 }
535
536 return NULL;
537}
538
539/**
540 * rtnl_af_register - Register rtnl_af_ops with rtnetlink.
541 * @ops: struct rtnl_af_ops * to register
542 *
543 * Returns 0 on success or a negative error code.
544 */
545void rtnl_af_register(struct rtnl_af_ops *ops)
546{
547 rtnl_lock();
548 list_add_tail_rcu(&ops->list, &rtnl_af_ops);
549 rtnl_unlock();
550}
551EXPORT_SYMBOL_GPL(rtnl_af_register);
552
553/**
554 * rtnl_af_unregister - Unregister rtnl_af_ops from rtnetlink.
555 * @ops: struct rtnl_af_ops * to unregister
556 */
557void rtnl_af_unregister(struct rtnl_af_ops *ops)
558{
559 rtnl_lock();
560 list_del_rcu(&ops->list);
561 rtnl_unlock();
562
563 synchronize_rcu();
564}
565EXPORT_SYMBOL_GPL(rtnl_af_unregister);
566
567static size_t rtnl_link_get_af_size(const struct net_device *dev,
568 u32 ext_filter_mask)
569{
570 struct rtnl_af_ops *af_ops;
571 size_t size;
572
573 /* IFLA_AF_SPEC */
574 size = nla_total_size(sizeof(struct nlattr));
575
576 rcu_read_lock();
577 list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) {
578 if (af_ops->get_link_af_size) {
579 /* AF_* + nested data */
580 size += nla_total_size(sizeof(struct nlattr)) +
581 af_ops->get_link_af_size(dev, ext_filter_mask);
582 }
583 }
584 rcu_read_unlock();
585
586 return size;
587}
588
589static bool rtnl_have_link_slave_info(const struct net_device *dev)
590{
591 struct net_device *master_dev;
592 bool ret = false;
593
594 rcu_read_lock();
595
596 master_dev = netdev_master_upper_dev_get_rcu((struct net_device *)dev);
597 if (master_dev && master_dev->rtnl_link_ops)
598 ret = true;
599 rcu_read_unlock();
600 return ret;
601}
602
603static int rtnl_link_slave_info_fill(struct sk_buff *skb,
604 const struct net_device *dev)
605{
606 struct net_device *master_dev;
607 const struct rtnl_link_ops *ops;
608 struct nlattr *slave_data;
609 int err;
610
611 master_dev = netdev_master_upper_dev_get((struct net_device *) dev);
612 if (!master_dev)
613 return 0;
614 ops = master_dev->rtnl_link_ops;
615 if (!ops)
616 return 0;
617 if (nla_put_string(skb, IFLA_INFO_SLAVE_KIND, ops->kind) < 0)
618 return -EMSGSIZE;
619 if (ops->fill_slave_info) {
620 slave_data = nla_nest_start(skb, IFLA_INFO_SLAVE_DATA);
621 if (!slave_data)
622 return -EMSGSIZE;
623 err = ops->fill_slave_info(skb, master_dev, dev);
624 if (err < 0)
625 goto err_cancel_slave_data;
626 nla_nest_end(skb, slave_data);
627 }
628 return 0;
629
630err_cancel_slave_data:
631 nla_nest_cancel(skb, slave_data);
632 return err;
633}
634
635static int rtnl_link_info_fill(struct sk_buff *skb,
636 const struct net_device *dev)
637{
638 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
639 struct nlattr *data;
640 int err;
641
642 if (!ops)
643 return 0;
644 if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0)
645 return -EMSGSIZE;
646 if (ops->fill_xstats) {
647 err = ops->fill_xstats(skb, dev);
648 if (err < 0)
649 return err;
650 }
651 if (ops->fill_info) {
652 data = nla_nest_start(skb, IFLA_INFO_DATA);
653 if (data == NULL)
654 return -EMSGSIZE;
655 err = ops->fill_info(skb, dev);
656 if (err < 0)
657 goto err_cancel_data;
658 nla_nest_end(skb, data);
659 }
660 return 0;
661
662err_cancel_data:
663 nla_nest_cancel(skb, data);
664 return err;
665}
666
667static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev)
668{
669 struct nlattr *linkinfo;
670 int err = -EMSGSIZE;
671
672 linkinfo = nla_nest_start(skb, IFLA_LINKINFO);
673 if (linkinfo == NULL)
674 goto out;
675
676 err = rtnl_link_info_fill(skb, dev);
677 if (err < 0)
678 goto err_cancel_link;
679
680 err = rtnl_link_slave_info_fill(skb, dev);
681 if (err < 0)
682 goto err_cancel_link;
683
684 nla_nest_end(skb, linkinfo);
685 return 0;
686
687err_cancel_link:
688 nla_nest_cancel(skb, linkinfo);
689out:
690 return err;
691}
692
693int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned int group, int echo)
694{
695 struct sock *rtnl = net->rtnl;
696 int err = 0;
697
698 NETLINK_CB(skb).dst_group = group;
699 if (echo)
700 refcount_inc(&skb->users);
701 netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL);
702 if (echo)
703 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
704 return err;
705}
706
707int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid)
708{
709 struct sock *rtnl = net->rtnl;
710
711 return nlmsg_unicast(rtnl, skb, pid);
712}
713EXPORT_SYMBOL(rtnl_unicast);
714
715void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group,
716 struct nlmsghdr *nlh, gfp_t flags)
717{
718 struct sock *rtnl = net->rtnl;
719 int report = 0;
720
721 if (nlh)
722 report = nlmsg_report(nlh);
723
724 nlmsg_notify(rtnl, skb, pid, group, report, flags);
725}
726EXPORT_SYMBOL(rtnl_notify);
727
728void rtnl_set_sk_err(struct net *net, u32 group, int error)
729{
730 struct sock *rtnl = net->rtnl;
731
732 netlink_set_err(rtnl, 0, group, error);
733}
734EXPORT_SYMBOL(rtnl_set_sk_err);
735
736int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics)
737{
738 struct nlattr *mx;
739 int i, valid = 0;
740
741 mx = nla_nest_start(skb, RTA_METRICS);
742 if (mx == NULL)
743 return -ENOBUFS;
744
745 for (i = 0; i < RTAX_MAX; i++) {
746 if (metrics[i]) {
747 if (i == RTAX_CC_ALGO - 1) {
748 char tmp[TCP_CA_NAME_MAX], *name;
749
750 name = tcp_ca_get_name_by_key(metrics[i], tmp);
751 if (!name)
752 continue;
753 if (nla_put_string(skb, i + 1, name))
754 goto nla_put_failure;
755 } else if (i == RTAX_FEATURES - 1) {
756 u32 user_features = metrics[i] & RTAX_FEATURE_MASK;
757
758 if (!user_features)
759 continue;
760 BUILD_BUG_ON(RTAX_FEATURE_MASK & DST_FEATURE_MASK);
761 if (nla_put_u32(skb, i + 1, user_features))
762 goto nla_put_failure;
763 } else {
764 if (nla_put_u32(skb, i + 1, metrics[i]))
765 goto nla_put_failure;
766 }
767 valid++;
768 }
769 }
770
771 if (!valid) {
772 nla_nest_cancel(skb, mx);
773 return 0;
774 }
775
776 return nla_nest_end(skb, mx);
777
778nla_put_failure:
779 nla_nest_cancel(skb, mx);
780 return -EMSGSIZE;
781}
782EXPORT_SYMBOL(rtnetlink_put_metrics);
783
784int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id,
785 long expires, u32 error)
786{
787 struct rta_cacheinfo ci = {
788 .rta_lastuse = jiffies_delta_to_clock_t(jiffies - dst->lastuse),
789 .rta_used = dst->__use,
790 .rta_clntref = atomic_read(&(dst->__refcnt)),
791 .rta_error = error,
792 .rta_id = id,
793 };
794
795 if (expires) {
796 unsigned long clock;
797
798 clock = jiffies_to_clock_t(abs(expires));
799 clock = min_t(unsigned long, clock, INT_MAX);
800 ci.rta_expires = (expires > 0) ? clock : -clock;
801 }
802 return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci);
803}
804EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo);
805
806static void set_operstate(struct net_device *dev, unsigned char transition)
807{
808 unsigned char operstate = dev->operstate;
809
810 switch (transition) {
811 case IF_OPER_UP:
812 if ((operstate == IF_OPER_DORMANT ||
813 operstate == IF_OPER_UNKNOWN) &&
814 !netif_dormant(dev))
815 operstate = IF_OPER_UP;
816 break;
817
818 case IF_OPER_DORMANT:
819 if (operstate == IF_OPER_UP ||
820 operstate == IF_OPER_UNKNOWN)
821 operstate = IF_OPER_DORMANT;
822 break;
823 }
824
825 if (dev->operstate != operstate) {
826 write_lock_bh(&dev_base_lock);
827 dev->operstate = operstate;
828 write_unlock_bh(&dev_base_lock);
829 netdev_state_change(dev);
830 }
831}
832
833static unsigned int rtnl_dev_get_flags(const struct net_device *dev)
834{
835 return (dev->flags & ~(IFF_PROMISC | IFF_ALLMULTI)) |
836 (dev->gflags & (IFF_PROMISC | IFF_ALLMULTI));
837}
838
839static unsigned int rtnl_dev_combine_flags(const struct net_device *dev,
840 const struct ifinfomsg *ifm)
841{
842 unsigned int flags = ifm->ifi_flags;
843
844 /* bugwards compatibility: ifi_change == 0 is treated as ~0 */
845 if (ifm->ifi_change)
846 flags = (flags & ifm->ifi_change) |
847 (rtnl_dev_get_flags(dev) & ~ifm->ifi_change);
848
849 return flags;
850}
851
852static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
853 const struct rtnl_link_stats64 *b)
854{
855 a->rx_packets = b->rx_packets;
856 a->tx_packets = b->tx_packets;
857 a->rx_bytes = b->rx_bytes;
858 a->tx_bytes = b->tx_bytes;
859 a->rx_errors = b->rx_errors;
860 a->tx_errors = b->tx_errors;
861 a->rx_dropped = b->rx_dropped;
862 a->tx_dropped = b->tx_dropped;
863
864 a->multicast = b->multicast;
865 a->collisions = b->collisions;
866
867 a->rx_length_errors = b->rx_length_errors;
868 a->rx_over_errors = b->rx_over_errors;
869 a->rx_crc_errors = b->rx_crc_errors;
870 a->rx_frame_errors = b->rx_frame_errors;
871 a->rx_fifo_errors = b->rx_fifo_errors;
872 a->rx_missed_errors = b->rx_missed_errors;
873
874 a->tx_aborted_errors = b->tx_aborted_errors;
875 a->tx_carrier_errors = b->tx_carrier_errors;
876 a->tx_fifo_errors = b->tx_fifo_errors;
877 a->tx_heartbeat_errors = b->tx_heartbeat_errors;
878 a->tx_window_errors = b->tx_window_errors;
879
880 a->rx_compressed = b->rx_compressed;
881 a->tx_compressed = b->tx_compressed;
882
883 a->rx_nohandler = b->rx_nohandler;
884}
885
886/* All VF info */
887static inline int rtnl_vfinfo_size(const struct net_device *dev,
888 u32 ext_filter_mask)
889{
890 if (dev->dev.parent && (ext_filter_mask & RTEXT_FILTER_VF)) {
891 int num_vfs = dev_num_vf(dev->dev.parent);
892 size_t size = nla_total_size(0);
893 size += num_vfs *
894 (nla_total_size(0) +
895 nla_total_size(sizeof(struct ifla_vf_mac)) +
896 nla_total_size(sizeof(struct ifla_vf_vlan)) +
897 nla_total_size(0) + /* nest IFLA_VF_VLAN_LIST */
898 nla_total_size(MAX_VLAN_LIST_LEN *
899 sizeof(struct ifla_vf_vlan_info)) +
900 nla_total_size(sizeof(struct ifla_vf_spoofchk)) +
901 nla_total_size(sizeof(struct ifla_vf_tx_rate)) +
902 nla_total_size(sizeof(struct ifla_vf_rate)) +
903 nla_total_size(sizeof(struct ifla_vf_link_state)) +
904 nla_total_size(sizeof(struct ifla_vf_rss_query_en)) +
905 nla_total_size(0) + /* nest IFLA_VF_STATS */
906 /* IFLA_VF_STATS_RX_PACKETS */
907 nla_total_size_64bit(sizeof(__u64)) +
908 /* IFLA_VF_STATS_TX_PACKETS */
909 nla_total_size_64bit(sizeof(__u64)) +
910 /* IFLA_VF_STATS_RX_BYTES */
911 nla_total_size_64bit(sizeof(__u64)) +
912 /* IFLA_VF_STATS_TX_BYTES */
913 nla_total_size_64bit(sizeof(__u64)) +
914 /* IFLA_VF_STATS_BROADCAST */
915 nla_total_size_64bit(sizeof(__u64)) +
916 /* IFLA_VF_STATS_MULTICAST */
917 nla_total_size_64bit(sizeof(__u64)) +
918 /* IFLA_VF_STATS_RX_DROPPED */
919 nla_total_size_64bit(sizeof(__u64)) +
920 /* IFLA_VF_STATS_TX_DROPPED */
921 nla_total_size_64bit(sizeof(__u64)) +
922 nla_total_size(sizeof(struct ifla_vf_trust)));
923 return size;
924 } else
925 return 0;
926}
927
928static size_t rtnl_port_size(const struct net_device *dev,
929 u32 ext_filter_mask)
930{
931 size_t port_size = nla_total_size(4) /* PORT_VF */
932 + nla_total_size(PORT_PROFILE_MAX) /* PORT_PROFILE */
933 + nla_total_size(PORT_UUID_MAX) /* PORT_INSTANCE_UUID */
934 + nla_total_size(PORT_UUID_MAX) /* PORT_HOST_UUID */
935 + nla_total_size(1) /* PROT_VDP_REQUEST */
936 + nla_total_size(2); /* PORT_VDP_RESPONSE */
937 size_t vf_ports_size = nla_total_size(sizeof(struct nlattr));
938 size_t vf_port_size = nla_total_size(sizeof(struct nlattr))
939 + port_size;
940 size_t port_self_size = nla_total_size(sizeof(struct nlattr))
941 + port_size;
942
943 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent ||
944 !(ext_filter_mask & RTEXT_FILTER_VF))
945 return 0;
946 if (dev_num_vf(dev->dev.parent))
947 return port_self_size + vf_ports_size +
948 vf_port_size * dev_num_vf(dev->dev.parent);
949 else
950 return port_self_size;
951}
952
953static size_t rtnl_xdp_size(void)
954{
955 size_t xdp_size = nla_total_size(0) + /* nest IFLA_XDP */
956 nla_total_size(1) + /* XDP_ATTACHED */
957 nla_total_size(4); /* XDP_PROG_ID */
958
959 return xdp_size;
960}
961
962static noinline size_t if_nlmsg_size(const struct net_device *dev,
963 u32 ext_filter_mask)
964{
965 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
966 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
967 + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */
968 + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */
969 + nla_total_size_64bit(sizeof(struct rtnl_link_ifmap))
970 + nla_total_size(sizeof(struct rtnl_link_stats))
971 + nla_total_size_64bit(sizeof(struct rtnl_link_stats64))
972 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
973 + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */
974 + nla_total_size(4) /* IFLA_TXQLEN */
975 + nla_total_size(4) /* IFLA_WEIGHT */
976 + nla_total_size(4) /* IFLA_MTU */
977 + nla_total_size(4) /* IFLA_LINK */
978 + nla_total_size(4) /* IFLA_MASTER */
979 + nla_total_size(1) /* IFLA_CARRIER */
980 + nla_total_size(4) /* IFLA_PROMISCUITY */
981 + nla_total_size(4) /* IFLA_NUM_TX_QUEUES */
982 + nla_total_size(4) /* IFLA_NUM_RX_QUEUES */
983 + nla_total_size(4) /* IFLA_GSO_MAX_SEGS */
984 + nla_total_size(4) /* IFLA_GSO_MAX_SIZE */
985 + nla_total_size(1) /* IFLA_OPERSTATE */
986 + nla_total_size(1) /* IFLA_LINKMODE */
987 + nla_total_size(4) /* IFLA_CARRIER_CHANGES */
988 + nla_total_size(4) /* IFLA_LINK_NETNSID */
989 + nla_total_size(4) /* IFLA_GROUP */
990 + nla_total_size(ext_filter_mask
991 & RTEXT_FILTER_VF ? 4 : 0) /* IFLA_NUM_VF */
992 + rtnl_vfinfo_size(dev, ext_filter_mask) /* IFLA_VFINFO_LIST */
993 + rtnl_port_size(dev, ext_filter_mask) /* IFLA_VF_PORTS + IFLA_PORT_SELF */
994 + rtnl_link_get_size(dev) /* IFLA_LINKINFO */
995 + rtnl_link_get_af_size(dev, ext_filter_mask) /* IFLA_AF_SPEC */
996 + nla_total_size(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_PORT_ID */
997 + nla_total_size(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_SWITCH_ID */
998 + nla_total_size(IFNAMSIZ) /* IFLA_PHYS_PORT_NAME */
999 + rtnl_xdp_size() /* IFLA_XDP */
1000 + nla_total_size(4) /* IFLA_EVENT */
1001 + nla_total_size(4) /* IFLA_NEW_NETNSID */
1002 + nla_total_size(4) /* IFLA_NEW_IFINDEX */
1003 + nla_total_size(1) /* IFLA_PROTO_DOWN */
1004 + nla_total_size(4) /* IFLA_IF_NETNSID */
1005 + nla_total_size(4) /* IFLA_CARRIER_UP_COUNT */
1006 + nla_total_size(4) /* IFLA_CARRIER_DOWN_COUNT */
1007 + 0;
1008}
1009
1010static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev)
1011{
1012 struct nlattr *vf_ports;
1013 struct nlattr *vf_port;
1014 int vf;
1015 int err;
1016
1017 vf_ports = nla_nest_start(skb, IFLA_VF_PORTS);
1018 if (!vf_ports)
1019 return -EMSGSIZE;
1020
1021 for (vf = 0; vf < dev_num_vf(dev->dev.parent); vf++) {
1022 vf_port = nla_nest_start(skb, IFLA_VF_PORT);
1023 if (!vf_port)
1024 goto nla_put_failure;
1025 if (nla_put_u32(skb, IFLA_PORT_VF, vf))
1026 goto nla_put_failure;
1027 err = dev->netdev_ops->ndo_get_vf_port(dev, vf, skb);
1028 if (err == -EMSGSIZE)
1029 goto nla_put_failure;
1030 if (err) {
1031 nla_nest_cancel(skb, vf_port);
1032 continue;
1033 }
1034 nla_nest_end(skb, vf_port);
1035 }
1036
1037 nla_nest_end(skb, vf_ports);
1038
1039 return 0;
1040
1041nla_put_failure:
1042 nla_nest_cancel(skb, vf_ports);
1043 return -EMSGSIZE;
1044}
1045
1046static int rtnl_port_self_fill(struct sk_buff *skb, struct net_device *dev)
1047{
1048 struct nlattr *port_self;
1049 int err;
1050
1051 port_self = nla_nest_start(skb, IFLA_PORT_SELF);
1052 if (!port_self)
1053 return -EMSGSIZE;
1054
1055 err = dev->netdev_ops->ndo_get_vf_port(dev, PORT_SELF_VF, skb);
1056 if (err) {
1057 nla_nest_cancel(skb, port_self);
1058 return (err == -EMSGSIZE) ? err : 0;
1059 }
1060
1061 nla_nest_end(skb, port_self);
1062
1063 return 0;
1064}
1065
1066static int rtnl_port_fill(struct sk_buff *skb, struct net_device *dev,
1067 u32 ext_filter_mask)
1068{
1069 int err;
1070
1071 if (!dev->netdev_ops->ndo_get_vf_port || !dev->dev.parent ||
1072 !(ext_filter_mask & RTEXT_FILTER_VF))
1073 return 0;
1074
1075 err = rtnl_port_self_fill(skb, dev);
1076 if (err)
1077 return err;
1078
1079 if (dev_num_vf(dev->dev.parent)) {
1080 err = rtnl_vf_ports_fill(skb, dev);
1081 if (err)
1082 return err;
1083 }
1084
1085 return 0;
1086}
1087
1088static int rtnl_phys_port_id_fill(struct sk_buff *skb, struct net_device *dev)
1089{
1090 int err;
1091 struct netdev_phys_item_id ppid;
1092
1093 err = dev_get_phys_port_id(dev, &ppid);
1094 if (err) {
1095 if (err == -EOPNOTSUPP)
1096 return 0;
1097 return err;
1098 }
1099
1100 if (nla_put(skb, IFLA_PHYS_PORT_ID, ppid.id_len, ppid.id))
1101 return -EMSGSIZE;
1102
1103 return 0;
1104}
1105
1106static int rtnl_phys_port_name_fill(struct sk_buff *skb, struct net_device *dev)
1107{
1108 char name[IFNAMSIZ];
1109 int err;
1110
1111 err = dev_get_phys_port_name(dev, name, sizeof(name));
1112 if (err) {
1113 if (err == -EOPNOTSUPP)
1114 return 0;
1115 return err;
1116 }
1117
1118 if (nla_put_string(skb, IFLA_PHYS_PORT_NAME, name))
1119 return -EMSGSIZE;
1120
1121 return 0;
1122}
1123
1124static int rtnl_phys_switch_id_fill(struct sk_buff *skb, struct net_device *dev)
1125{
1126 int err;
1127 struct switchdev_attr attr = {
1128 .orig_dev = dev,
1129 .id = SWITCHDEV_ATTR_ID_PORT_PARENT_ID,
1130 .flags = SWITCHDEV_F_NO_RECURSE,
1131 };
1132
1133 err = switchdev_port_attr_get(dev, &attr);
1134 if (err) {
1135 if (err == -EOPNOTSUPP)
1136 return 0;
1137 return err;
1138 }
1139
1140 if (nla_put(skb, IFLA_PHYS_SWITCH_ID, attr.u.ppid.id_len,
1141 attr.u.ppid.id))
1142 return -EMSGSIZE;
1143
1144 return 0;
1145}
1146
1147static noinline_for_stack int rtnl_fill_stats(struct sk_buff *skb,
1148 struct net_device *dev)
1149{
1150 struct rtnl_link_stats64 *sp;
1151 struct nlattr *attr;
1152
1153 attr = nla_reserve_64bit(skb, IFLA_STATS64,
1154 sizeof(struct rtnl_link_stats64), IFLA_PAD);
1155 if (!attr)
1156 return -EMSGSIZE;
1157
1158 sp = nla_data(attr);
1159 dev_get_stats(dev, sp);
1160
1161 attr = nla_reserve(skb, IFLA_STATS,
1162 sizeof(struct rtnl_link_stats));
1163 if (!attr)
1164 return -EMSGSIZE;
1165
1166 copy_rtnl_link_stats(nla_data(attr), sp);
1167
1168 return 0;
1169}
1170
1171static noinline_for_stack int rtnl_fill_vfinfo(struct sk_buff *skb,
1172 struct net_device *dev,
1173 int vfs_num,
1174 struct nlattr *vfinfo)
1175{
1176 struct ifla_vf_rss_query_en vf_rss_query_en;
1177 struct nlattr *vf, *vfstats, *vfvlanlist;
1178 struct ifla_vf_link_state vf_linkstate;
1179 struct ifla_vf_vlan_info vf_vlan_info;
1180 struct ifla_vf_spoofchk vf_spoofchk;
1181 struct ifla_vf_tx_rate vf_tx_rate;
1182 struct ifla_vf_stats vf_stats;
1183 struct ifla_vf_trust vf_trust;
1184 struct ifla_vf_vlan vf_vlan;
1185 struct ifla_vf_rate vf_rate;
1186 struct ifla_vf_mac vf_mac;
1187 struct ifla_vf_info ivi;
1188
1189 memset(&ivi, 0, sizeof(ivi));
1190
1191 /* Not all SR-IOV capable drivers support the
1192 * spoofcheck and "RSS query enable" query. Preset to
1193 * -1 so the user space tool can detect that the driver
1194 * didn't report anything.
1195 */
1196 ivi.spoofchk = -1;
1197 ivi.rss_query_en = -1;
1198 ivi.trusted = -1;
1199 /* The default value for VF link state is "auto"
1200 * IFLA_VF_LINK_STATE_AUTO which equals zero
1201 */
1202 ivi.linkstate = 0;
1203 /* VLAN Protocol by default is 802.1Q */
1204 ivi.vlan_proto = htons(ETH_P_8021Q);
1205 if (dev->netdev_ops->ndo_get_vf_config(dev, vfs_num, &ivi))
1206 return 0;
1207
1208 memset(&vf_vlan_info, 0, sizeof(vf_vlan_info));
1209
1210 vf_mac.vf =
1211 vf_vlan.vf =
1212 vf_vlan_info.vf =
1213 vf_rate.vf =
1214 vf_tx_rate.vf =
1215 vf_spoofchk.vf =
1216 vf_linkstate.vf =
1217 vf_rss_query_en.vf =
1218 vf_trust.vf = ivi.vf;
1219
1220 memcpy(vf_mac.mac, ivi.mac, sizeof(ivi.mac));
1221 vf_vlan.vlan = ivi.vlan;
1222 vf_vlan.qos = ivi.qos;
1223 vf_vlan_info.vlan = ivi.vlan;
1224 vf_vlan_info.qos = ivi.qos;
1225 vf_vlan_info.vlan_proto = ivi.vlan_proto;
1226 vf_tx_rate.rate = ivi.max_tx_rate;
1227 vf_rate.min_tx_rate = ivi.min_tx_rate;
1228 vf_rate.max_tx_rate = ivi.max_tx_rate;
1229 vf_spoofchk.setting = ivi.spoofchk;
1230 vf_linkstate.link_state = ivi.linkstate;
1231 vf_rss_query_en.setting = ivi.rss_query_en;
1232 vf_trust.setting = ivi.trusted;
1233 vf = nla_nest_start(skb, IFLA_VF_INFO);
1234 if (!vf)
1235 goto nla_put_vfinfo_failure;
1236 if (nla_put(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac) ||
1237 nla_put(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan) ||
1238 nla_put(skb, IFLA_VF_RATE, sizeof(vf_rate),
1239 &vf_rate) ||
1240 nla_put(skb, IFLA_VF_TX_RATE, sizeof(vf_tx_rate),
1241 &vf_tx_rate) ||
1242 nla_put(skb, IFLA_VF_SPOOFCHK, sizeof(vf_spoofchk),
1243 &vf_spoofchk) ||
1244 nla_put(skb, IFLA_VF_LINK_STATE, sizeof(vf_linkstate),
1245 &vf_linkstate) ||
1246 nla_put(skb, IFLA_VF_RSS_QUERY_EN,
1247 sizeof(vf_rss_query_en),
1248 &vf_rss_query_en) ||
1249 nla_put(skb, IFLA_VF_TRUST,
1250 sizeof(vf_trust), &vf_trust))
1251 goto nla_put_vf_failure;
1252 vfvlanlist = nla_nest_start(skb, IFLA_VF_VLAN_LIST);
1253 if (!vfvlanlist)
1254 goto nla_put_vf_failure;
1255 if (nla_put(skb, IFLA_VF_VLAN_INFO, sizeof(vf_vlan_info),
1256 &vf_vlan_info)) {
1257 nla_nest_cancel(skb, vfvlanlist);
1258 goto nla_put_vf_failure;
1259 }
1260 nla_nest_end(skb, vfvlanlist);
1261 memset(&vf_stats, 0, sizeof(vf_stats));
1262 if (dev->netdev_ops->ndo_get_vf_stats)
1263 dev->netdev_ops->ndo_get_vf_stats(dev, vfs_num,
1264 &vf_stats);
1265 vfstats = nla_nest_start(skb, IFLA_VF_STATS);
1266 if (!vfstats)
1267 goto nla_put_vf_failure;
1268 if (nla_put_u64_64bit(skb, IFLA_VF_STATS_RX_PACKETS,
1269 vf_stats.rx_packets, IFLA_VF_STATS_PAD) ||
1270 nla_put_u64_64bit(skb, IFLA_VF_STATS_TX_PACKETS,
1271 vf_stats.tx_packets, IFLA_VF_STATS_PAD) ||
1272 nla_put_u64_64bit(skb, IFLA_VF_STATS_RX_BYTES,
1273 vf_stats.rx_bytes, IFLA_VF_STATS_PAD) ||
1274 nla_put_u64_64bit(skb, IFLA_VF_STATS_TX_BYTES,
1275 vf_stats.tx_bytes, IFLA_VF_STATS_PAD) ||
1276 nla_put_u64_64bit(skb, IFLA_VF_STATS_BROADCAST,
1277 vf_stats.broadcast, IFLA_VF_STATS_PAD) ||
1278 nla_put_u64_64bit(skb, IFLA_VF_STATS_MULTICAST,
1279 vf_stats.multicast, IFLA_VF_STATS_PAD) ||
1280 nla_put_u64_64bit(skb, IFLA_VF_STATS_RX_DROPPED,
1281 vf_stats.rx_dropped, IFLA_VF_STATS_PAD) ||
1282 nla_put_u64_64bit(skb, IFLA_VF_STATS_TX_DROPPED,
1283 vf_stats.tx_dropped, IFLA_VF_STATS_PAD)) {
1284 nla_nest_cancel(skb, vfstats);
1285 goto nla_put_vf_failure;
1286 }
1287 nla_nest_end(skb, vfstats);
1288 nla_nest_end(skb, vf);
1289 return 0;
1290
1291nla_put_vf_failure:
1292 nla_nest_cancel(skb, vf);
1293nla_put_vfinfo_failure:
1294 nla_nest_cancel(skb, vfinfo);
1295 return -EMSGSIZE;
1296}
1297
1298static noinline_for_stack int rtnl_fill_vf(struct sk_buff *skb,
1299 struct net_device *dev,
1300 u32 ext_filter_mask)
1301{
1302 struct nlattr *vfinfo;
1303 int i, num_vfs;
1304
1305 if (!dev->dev.parent || ((ext_filter_mask & RTEXT_FILTER_VF) == 0))
1306 return 0;
1307
1308 num_vfs = dev_num_vf(dev->dev.parent);
1309 if (nla_put_u32(skb, IFLA_NUM_VF, num_vfs))
1310 return -EMSGSIZE;
1311
1312 if (!dev->netdev_ops->ndo_get_vf_config)
1313 return 0;
1314
1315 vfinfo = nla_nest_start(skb, IFLA_VFINFO_LIST);
1316 if (!vfinfo)
1317 return -EMSGSIZE;
1318
1319 for (i = 0; i < num_vfs; i++) {
1320 if (rtnl_fill_vfinfo(skb, dev, i, vfinfo))
1321 return -EMSGSIZE;
1322 }
1323
1324 nla_nest_end(skb, vfinfo);
1325 return 0;
1326}
1327
1328static int rtnl_fill_link_ifmap(struct sk_buff *skb, struct net_device *dev)
1329{
1330 struct rtnl_link_ifmap map;
1331
1332 memset(&map, 0, sizeof(map));
1333 map.mem_start = dev->mem_start;
1334 map.mem_end = dev->mem_end;
1335 map.base_addr = dev->base_addr;
1336 map.irq = dev->irq;
1337 map.dma = dev->dma;
1338 map.port = dev->if_port;
1339
1340 if (nla_put_64bit(skb, IFLA_MAP, sizeof(map), &map, IFLA_PAD))
1341 return -EMSGSIZE;
1342
1343 return 0;
1344}
1345
1346static u8 rtnl_xdp_attached_mode(struct net_device *dev, u32 *prog_id)
1347{
1348 const struct net_device_ops *ops = dev->netdev_ops;
1349 const struct bpf_prog *generic_xdp_prog;
1350 struct netdev_bpf xdp;
1351
1352 ASSERT_RTNL();
1353
1354 *prog_id = 0;
1355 generic_xdp_prog = rtnl_dereference(dev->xdp_prog);
1356 if (generic_xdp_prog) {
1357 *prog_id = generic_xdp_prog->aux->id;
1358 return XDP_ATTACHED_SKB;
1359 }
1360 if (!ops->ndo_bpf)
1361 return XDP_ATTACHED_NONE;
1362
1363 __dev_xdp_query(dev, ops->ndo_bpf, &xdp);
1364 *prog_id = xdp.prog_id;
1365
1366 return xdp.prog_attached;
1367}
1368
1369static int rtnl_xdp_fill(struct sk_buff *skb, struct net_device *dev)
1370{
1371 struct nlattr *xdp;
1372 u32 prog_id;
1373 int err;
1374
1375 xdp = nla_nest_start(skb, IFLA_XDP);
1376 if (!xdp)
1377 return -EMSGSIZE;
1378
1379 err = nla_put_u8(skb, IFLA_XDP_ATTACHED,
1380 rtnl_xdp_attached_mode(dev, &prog_id));
1381 if (err)
1382 goto err_cancel;
1383
1384 if (prog_id) {
1385 err = nla_put_u32(skb, IFLA_XDP_PROG_ID, prog_id);
1386 if (err)
1387 goto err_cancel;
1388 }
1389
1390 nla_nest_end(skb, xdp);
1391 return 0;
1392
1393err_cancel:
1394 nla_nest_cancel(skb, xdp);
1395 return err;
1396}
1397
1398static u32 rtnl_get_event(unsigned long event)
1399{
1400 u32 rtnl_event_type = IFLA_EVENT_NONE;
1401
1402 switch (event) {
1403 case NETDEV_REBOOT:
1404 rtnl_event_type = IFLA_EVENT_REBOOT;
1405 break;
1406 case NETDEV_FEAT_CHANGE:
1407 rtnl_event_type = IFLA_EVENT_FEATURES;
1408 break;
1409 case NETDEV_BONDING_FAILOVER:
1410 rtnl_event_type = IFLA_EVENT_BONDING_FAILOVER;
1411 break;
1412 case NETDEV_NOTIFY_PEERS:
1413 rtnl_event_type = IFLA_EVENT_NOTIFY_PEERS;
1414 break;
1415 case NETDEV_RESEND_IGMP:
1416 rtnl_event_type = IFLA_EVENT_IGMP_RESEND;
1417 break;
1418 case NETDEV_CHANGEINFODATA:
1419 rtnl_event_type = IFLA_EVENT_BONDING_OPTIONS;
1420 break;
1421 default:
1422 break;
1423 }
1424
1425 return rtnl_event_type;
1426}
1427
1428static int put_master_ifindex(struct sk_buff *skb, struct net_device *dev)
1429{
1430 const struct net_device *upper_dev;
1431 int ret = 0;
1432
1433 rcu_read_lock();
1434
1435 upper_dev = netdev_master_upper_dev_get_rcu(dev);
1436 if (upper_dev)
1437 ret = nla_put_u32(skb, IFLA_MASTER, upper_dev->ifindex);
1438
1439 rcu_read_unlock();
1440 return ret;
1441}
1442
1443static int nla_put_iflink(struct sk_buff *skb, const struct net_device *dev)
1444{
1445 int ifindex = dev_get_iflink(dev);
1446
1447 if (dev->ifindex == ifindex)
1448 return 0;
1449
1450 return nla_put_u32(skb, IFLA_LINK, ifindex);
1451}
1452
1453static noinline_for_stack int nla_put_ifalias(struct sk_buff *skb,
1454 struct net_device *dev)
1455{
1456 char buf[IFALIASZ];
1457 int ret;
1458
1459 ret = dev_get_alias(dev, buf, sizeof(buf));
1460 return ret > 0 ? nla_put_string(skb, IFLA_IFALIAS, buf) : 0;
1461}
1462
1463static int rtnl_fill_link_netnsid(struct sk_buff *skb,
1464 const struct net_device *dev,
1465 struct net *src_net)
1466{
1467 if (dev->rtnl_link_ops && dev->rtnl_link_ops->get_link_net) {
1468 struct net *link_net = dev->rtnl_link_ops->get_link_net(dev);
1469
1470 if (!net_eq(dev_net(dev), link_net)) {
1471 int id = peernet2id_alloc(src_net, link_net);
1472
1473 if (nla_put_s32(skb, IFLA_LINK_NETNSID, id))
1474 return -EMSGSIZE;
1475 }
1476 }
1477
1478 return 0;
1479}
1480
1481static int rtnl_fill_link_af(struct sk_buff *skb,
1482 const struct net_device *dev,
1483 u32 ext_filter_mask)
1484{
1485 const struct rtnl_af_ops *af_ops;
1486 struct nlattr *af_spec;
1487
1488 af_spec = nla_nest_start(skb, IFLA_AF_SPEC);
1489 if (!af_spec)
1490 return -EMSGSIZE;
1491
1492 list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) {
1493 struct nlattr *af;
1494 int err;
1495
1496 if (!af_ops->fill_link_af)
1497 continue;
1498
1499 af = nla_nest_start(skb, af_ops->family);
1500 if (!af)
1501 return -EMSGSIZE;
1502
1503 err = af_ops->fill_link_af(skb, dev, ext_filter_mask);
1504 /*
1505 * Caller may return ENODATA to indicate that there
1506 * was no data to be dumped. This is not an error, it
1507 * means we should trim the attribute header and
1508 * continue.
1509 */
1510 if (err == -ENODATA)
1511 nla_nest_cancel(skb, af);
1512 else if (err < 0)
1513 return -EMSGSIZE;
1514
1515 nla_nest_end(skb, af);
1516 }
1517
1518 nla_nest_end(skb, af_spec);
1519 return 0;
1520}
1521
1522static int rtnl_fill_ifinfo(struct sk_buff *skb,
1523 struct net_device *dev, struct net *src_net,
1524 int type, u32 pid, u32 seq, u32 change,
1525 unsigned int flags, u32 ext_filter_mask,
1526 u32 event, int *new_nsid, int new_ifindex,
1527 int tgt_netnsid)
1528{
1529 struct ifinfomsg *ifm;
1530 struct nlmsghdr *nlh;
1531
1532 ASSERT_RTNL();
1533 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
1534 if (nlh == NULL)
1535 return -EMSGSIZE;
1536
1537 ifm = nlmsg_data(nlh);
1538 ifm->ifi_family = AF_UNSPEC;
1539 ifm->__ifi_pad = 0;
1540 ifm->ifi_type = dev->type;
1541 ifm->ifi_index = dev->ifindex;
1542 ifm->ifi_flags = dev_get_flags(dev);
1543 ifm->ifi_change = change;
1544
1545 if (tgt_netnsid >= 0 && nla_put_s32(skb, IFLA_IF_NETNSID, tgt_netnsid))
1546 goto nla_put_failure;
1547
1548 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
1549 nla_put_u32(skb, IFLA_TXQLEN, dev->tx_queue_len) ||
1550 nla_put_u8(skb, IFLA_OPERSTATE,
1551 netif_running(dev) ? dev->operstate : IF_OPER_DOWN) ||
1552 nla_put_u8(skb, IFLA_LINKMODE, dev->link_mode) ||
1553 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
1554 nla_put_u32(skb, IFLA_GROUP, dev->group) ||
1555 nla_put_u32(skb, IFLA_PROMISCUITY, dev->promiscuity) ||
1556 nla_put_u32(skb, IFLA_NUM_TX_QUEUES, dev->num_tx_queues) ||
1557 nla_put_u32(skb, IFLA_GSO_MAX_SEGS, dev->gso_max_segs) ||
1558 nla_put_u32(skb, IFLA_GSO_MAX_SIZE, dev->gso_max_size) ||
1559#ifdef CONFIG_RPS
1560 nla_put_u32(skb, IFLA_NUM_RX_QUEUES, dev->num_rx_queues) ||
1561#endif
1562 nla_put_iflink(skb, dev) ||
1563 put_master_ifindex(skb, dev) ||
1564 nla_put_u8(skb, IFLA_CARRIER, netif_carrier_ok(dev)) ||
1565 (dev->qdisc &&
1566 nla_put_string(skb, IFLA_QDISC, dev->qdisc->ops->id)) ||
1567 nla_put_ifalias(skb, dev) ||
1568 nla_put_u32(skb, IFLA_CARRIER_CHANGES,
1569 atomic_read(&dev->carrier_up_count) +
1570 atomic_read(&dev->carrier_down_count)) ||
1571 nla_put_u8(skb, IFLA_PROTO_DOWN, dev->proto_down) ||
1572 nla_put_u32(skb, IFLA_CARRIER_UP_COUNT,
1573 atomic_read(&dev->carrier_up_count)) ||
1574 nla_put_u32(skb, IFLA_CARRIER_DOWN_COUNT,
1575 atomic_read(&dev->carrier_down_count)))
1576 goto nla_put_failure;
1577
1578 if (event != IFLA_EVENT_NONE) {
1579 if (nla_put_u32(skb, IFLA_EVENT, event))
1580 goto nla_put_failure;
1581 }
1582
1583 if (rtnl_fill_link_ifmap(skb, dev))
1584 goto nla_put_failure;
1585
1586 if (dev->addr_len) {
1587 if (nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr) ||
1588 nla_put(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast))
1589 goto nla_put_failure;
1590 }
1591
1592 if (rtnl_phys_port_id_fill(skb, dev))
1593 goto nla_put_failure;
1594
1595 if (rtnl_phys_port_name_fill(skb, dev))
1596 goto nla_put_failure;
1597
1598 if (rtnl_phys_switch_id_fill(skb, dev))
1599 goto nla_put_failure;
1600
1601 if (rtnl_fill_stats(skb, dev))
1602 goto nla_put_failure;
1603
1604 if (rtnl_fill_vf(skb, dev, ext_filter_mask))
1605 goto nla_put_failure;
1606
1607 if (rtnl_port_fill(skb, dev, ext_filter_mask))
1608 goto nla_put_failure;
1609
1610 if (rtnl_xdp_fill(skb, dev))
1611 goto nla_put_failure;
1612
1613 if (dev->rtnl_link_ops || rtnl_have_link_slave_info(dev)) {
1614 if (rtnl_link_fill(skb, dev) < 0)
1615 goto nla_put_failure;
1616 }
1617
1618 if (rtnl_fill_link_netnsid(skb, dev, src_net))
1619 goto nla_put_failure;
1620
1621 if (new_nsid &&
1622 nla_put_s32(skb, IFLA_NEW_NETNSID, *new_nsid) < 0)
1623 goto nla_put_failure;
1624 if (new_ifindex &&
1625 nla_put_s32(skb, IFLA_NEW_IFINDEX, new_ifindex) < 0)
1626 goto nla_put_failure;
1627
1628
1629 rcu_read_lock();
1630 if (rtnl_fill_link_af(skb, dev, ext_filter_mask))
1631 goto nla_put_failure_rcu;
1632 rcu_read_unlock();
1633
1634 nlmsg_end(skb, nlh);
1635 return 0;
1636
1637nla_put_failure_rcu:
1638 rcu_read_unlock();
1639nla_put_failure:
1640 nlmsg_cancel(skb, nlh);
1641 return -EMSGSIZE;
1642}
1643
1644static const struct nla_policy ifla_policy[IFLA_MAX+1] = {
1645 [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 },
1646 [IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1647 [IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1648 [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) },
1649 [IFLA_MTU] = { .type = NLA_U32 },
1650 [IFLA_LINK] = { .type = NLA_U32 },
1651 [IFLA_MASTER] = { .type = NLA_U32 },
1652 [IFLA_CARRIER] = { .type = NLA_U8 },
1653 [IFLA_TXQLEN] = { .type = NLA_U32 },
1654 [IFLA_WEIGHT] = { .type = NLA_U32 },
1655 [IFLA_OPERSTATE] = { .type = NLA_U8 },
1656 [IFLA_LINKMODE] = { .type = NLA_U8 },
1657 [IFLA_LINKINFO] = { .type = NLA_NESTED },
1658 [IFLA_NET_NS_PID] = { .type = NLA_U32 },
1659 [IFLA_NET_NS_FD] = { .type = NLA_U32 },
1660 /* IFLA_IFALIAS is a string, but policy is set to NLA_BINARY to
1661 * allow 0-length string (needed to remove an alias).
1662 */
1663 [IFLA_IFALIAS] = { .type = NLA_BINARY, .len = IFALIASZ - 1 },
1664 [IFLA_VFINFO_LIST] = {. type = NLA_NESTED },
1665 [IFLA_VF_PORTS] = { .type = NLA_NESTED },
1666 [IFLA_PORT_SELF] = { .type = NLA_NESTED },
1667 [IFLA_AF_SPEC] = { .type = NLA_NESTED },
1668 [IFLA_EXT_MASK] = { .type = NLA_U32 },
1669 [IFLA_PROMISCUITY] = { .type = NLA_U32 },
1670 [IFLA_NUM_TX_QUEUES] = { .type = NLA_U32 },
1671 [IFLA_NUM_RX_QUEUES] = { .type = NLA_U32 },
1672 [IFLA_GSO_MAX_SEGS] = { .type = NLA_U32 },
1673 [IFLA_GSO_MAX_SIZE] = { .type = NLA_U32 },
1674 [IFLA_PHYS_PORT_ID] = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN },
1675 [IFLA_CARRIER_CHANGES] = { .type = NLA_U32 }, /* ignored */
1676 [IFLA_PHYS_SWITCH_ID] = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN },
1677 [IFLA_LINK_NETNSID] = { .type = NLA_S32 },
1678 [IFLA_PROTO_DOWN] = { .type = NLA_U8 },
1679 [IFLA_XDP] = { .type = NLA_NESTED },
1680 [IFLA_EVENT] = { .type = NLA_U32 },
1681 [IFLA_GROUP] = { .type = NLA_U32 },
1682 [IFLA_IF_NETNSID] = { .type = NLA_S32 },
1683 [IFLA_CARRIER_UP_COUNT] = { .type = NLA_U32 },
1684 [IFLA_CARRIER_DOWN_COUNT] = { .type = NLA_U32 },
1685};
1686
1687static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
1688 [IFLA_INFO_KIND] = { .type = NLA_STRING },
1689 [IFLA_INFO_DATA] = { .type = NLA_NESTED },
1690 [IFLA_INFO_SLAVE_KIND] = { .type = NLA_STRING },
1691 [IFLA_INFO_SLAVE_DATA] = { .type = NLA_NESTED },
1692};
1693
1694static const struct nla_policy ifla_vf_policy[IFLA_VF_MAX+1] = {
1695 [IFLA_VF_MAC] = { .len = sizeof(struct ifla_vf_mac) },
1696 [IFLA_VF_VLAN] = { .len = sizeof(struct ifla_vf_vlan) },
1697 [IFLA_VF_VLAN_LIST] = { .type = NLA_NESTED },
1698 [IFLA_VF_TX_RATE] = { .len = sizeof(struct ifla_vf_tx_rate) },
1699 [IFLA_VF_SPOOFCHK] = { .len = sizeof(struct ifla_vf_spoofchk) },
1700 [IFLA_VF_RATE] = { .len = sizeof(struct ifla_vf_rate) },
1701 [IFLA_VF_LINK_STATE] = { .len = sizeof(struct ifla_vf_link_state) },
1702 [IFLA_VF_RSS_QUERY_EN] = { .len = sizeof(struct ifla_vf_rss_query_en) },
1703 [IFLA_VF_STATS] = { .type = NLA_NESTED },
1704 [IFLA_VF_TRUST] = { .len = sizeof(struct ifla_vf_trust) },
1705 [IFLA_VF_IB_NODE_GUID] = { .len = sizeof(struct ifla_vf_guid) },
1706 [IFLA_VF_IB_PORT_GUID] = { .len = sizeof(struct ifla_vf_guid) },
1707};
1708
1709static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = {
1710 [IFLA_PORT_VF] = { .type = NLA_U32 },
1711 [IFLA_PORT_PROFILE] = { .type = NLA_STRING,
1712 .len = PORT_PROFILE_MAX },
1713 [IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY,
1714 .len = PORT_UUID_MAX },
1715 [IFLA_PORT_HOST_UUID] = { .type = NLA_STRING,
1716 .len = PORT_UUID_MAX },
1717 [IFLA_PORT_REQUEST] = { .type = NLA_U8, },
1718 [IFLA_PORT_RESPONSE] = { .type = NLA_U16, },
1719
1720 /* Unused, but we need to keep it here since user space could
1721 * fill it. It's also broken with regard to NLA_BINARY use in
1722 * combination with structs.
1723 */
1724 [IFLA_PORT_VSI_TYPE] = { .type = NLA_BINARY,
1725 .len = sizeof(struct ifla_port_vsi) },
1726};
1727
1728static const struct nla_policy ifla_xdp_policy[IFLA_XDP_MAX + 1] = {
1729 [IFLA_XDP_FD] = { .type = NLA_S32 },
1730 [IFLA_XDP_ATTACHED] = { .type = NLA_U8 },
1731 [IFLA_XDP_FLAGS] = { .type = NLA_U32 },
1732 [IFLA_XDP_PROG_ID] = { .type = NLA_U32 },
1733};
1734
1735static const struct rtnl_link_ops *linkinfo_to_kind_ops(const struct nlattr *nla)
1736{
1737 const struct rtnl_link_ops *ops = NULL;
1738 struct nlattr *linfo[IFLA_INFO_MAX + 1];
1739
1740 if (nla_parse_nested(linfo, IFLA_INFO_MAX, nla,
1741 ifla_info_policy, NULL) < 0)
1742 return NULL;
1743
1744 if (linfo[IFLA_INFO_KIND]) {
1745 char kind[MODULE_NAME_LEN];
1746
1747 nla_strlcpy(kind, linfo[IFLA_INFO_KIND], sizeof(kind));
1748 ops = rtnl_link_ops_get(kind);
1749 }
1750
1751 return ops;
1752}
1753
1754static bool link_master_filtered(struct net_device *dev, int master_idx)
1755{
1756 struct net_device *master;
1757
1758 if (!master_idx)
1759 return false;
1760
1761 master = netdev_master_upper_dev_get(dev);
1762 if (!master || master->ifindex != master_idx)
1763 return true;
1764
1765 return false;
1766}
1767
1768static bool link_kind_filtered(const struct net_device *dev,
1769 const struct rtnl_link_ops *kind_ops)
1770{
1771 if (kind_ops && dev->rtnl_link_ops != kind_ops)
1772 return true;
1773
1774 return false;
1775}
1776
1777static bool link_dump_filtered(struct net_device *dev,
1778 int master_idx,
1779 const struct rtnl_link_ops *kind_ops)
1780{
1781 if (link_master_filtered(dev, master_idx) ||
1782 link_kind_filtered(dev, kind_ops))
1783 return true;
1784
1785 return false;
1786}
1787
1788static struct net *get_target_net(struct sock *sk, int netnsid)
1789{
1790 struct net *net;
1791
1792 net = get_net_ns_by_id(sock_net(sk), netnsid);
1793 if (!net)
1794 return ERR_PTR(-EINVAL);
1795
1796 /* For now, the caller is required to have CAP_NET_ADMIN in
1797 * the user namespace owning the target net ns.
1798 */
1799 if (!sk_ns_capable(sk, net->user_ns, CAP_NET_ADMIN)) {
1800 put_net(net);
1801 return ERR_PTR(-EACCES);
1802 }
1803 return net;
1804}
1805
1806static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
1807{
1808 struct net *net = sock_net(skb->sk);
1809 struct net *tgt_net = net;
1810 int h, s_h;
1811 int idx = 0, s_idx;
1812 struct net_device *dev;
1813 struct hlist_head *head;
1814 struct nlattr *tb[IFLA_MAX+1];
1815 u32 ext_filter_mask = 0;
1816 const struct rtnl_link_ops *kind_ops = NULL;
1817 unsigned int flags = NLM_F_MULTI;
1818 int master_idx = 0;
1819 int netnsid = -1;
1820 int err;
1821 int hdrlen;
1822
1823 s_h = cb->args[0];
1824 s_idx = cb->args[1];
1825
1826 /* A hack to preserve kernel<->userspace interface.
1827 * The correct header is ifinfomsg. It is consistent with rtnl_getlink.
1828 * However, before Linux v3.9 the code here assumed rtgenmsg and that's
1829 * what iproute2 < v3.9.0 used.
1830 * We can detect the old iproute2. Even including the IFLA_EXT_MASK
1831 * attribute, its netlink message is shorter than struct ifinfomsg.
1832 */
1833 hdrlen = nlmsg_len(cb->nlh) < sizeof(struct ifinfomsg) ?
1834 sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg);
1835
1836 if (nlmsg_parse(cb->nlh, hdrlen, tb, IFLA_MAX,
1837 ifla_policy, NULL) >= 0) {
1838 if (tb[IFLA_IF_NETNSID]) {
1839 netnsid = nla_get_s32(tb[IFLA_IF_NETNSID]);
1840 tgt_net = get_target_net(skb->sk, netnsid);
1841 if (IS_ERR(tgt_net)) {
1842 tgt_net = net;
1843 netnsid = -1;
1844 }
1845 }
1846
1847 if (tb[IFLA_EXT_MASK])
1848 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
1849
1850 if (tb[IFLA_MASTER])
1851 master_idx = nla_get_u32(tb[IFLA_MASTER]);
1852
1853 if (tb[IFLA_LINKINFO])
1854 kind_ops = linkinfo_to_kind_ops(tb[IFLA_LINKINFO]);
1855
1856 if (master_idx || kind_ops)
1857 flags |= NLM_F_DUMP_FILTERED;
1858 }
1859
1860 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1861 idx = 0;
1862 head = &tgt_net->dev_index_head[h];
1863 hlist_for_each_entry(dev, head, index_hlist) {
1864 if (link_dump_filtered(dev, master_idx, kind_ops))
1865 goto cont;
1866 if (idx < s_idx)
1867 goto cont;
1868 err = rtnl_fill_ifinfo(skb, dev, net,
1869 RTM_NEWLINK,
1870 NETLINK_CB(cb->skb).portid,
1871 cb->nlh->nlmsg_seq, 0,
1872 flags,
1873 ext_filter_mask, 0, NULL, 0,
1874 netnsid);
1875
1876 if (err < 0) {
1877 if (likely(skb->len))
1878 goto out;
1879
1880 goto out_err;
1881 }
1882cont:
1883 idx++;
1884 }
1885 }
1886out:
1887 err = skb->len;
1888out_err:
1889 cb->args[1] = idx;
1890 cb->args[0] = h;
1891 cb->seq = net->dev_base_seq;
1892 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1893 if (netnsid >= 0)
1894 put_net(tgt_net);
1895
1896 return err;
1897}
1898
1899int rtnl_nla_parse_ifla(struct nlattr **tb, const struct nlattr *head, int len,
1900 struct netlink_ext_ack *exterr)
1901{
1902 return nla_parse(tb, IFLA_MAX, head, len, ifla_policy, exterr);
1903}
1904EXPORT_SYMBOL(rtnl_nla_parse_ifla);
1905
1906struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[])
1907{
1908 struct net *net;
1909 /* Examine the link attributes and figure out which
1910 * network namespace we are talking about.
1911 */
1912 if (tb[IFLA_NET_NS_PID])
1913 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID]));
1914 else if (tb[IFLA_NET_NS_FD])
1915 net = get_net_ns_by_fd(nla_get_u32(tb[IFLA_NET_NS_FD]));
1916 else
1917 net = get_net(src_net);
1918 return net;
1919}
1920EXPORT_SYMBOL(rtnl_link_get_net);
1921
1922/* Figure out which network namespace we are talking about by
1923 * examining the link attributes in the following order:
1924 *
1925 * 1. IFLA_NET_NS_PID
1926 * 2. IFLA_NET_NS_FD
1927 * 3. IFLA_IF_NETNSID
1928 */
1929static struct net *rtnl_link_get_net_by_nlattr(struct net *src_net,
1930 struct nlattr *tb[])
1931{
1932 struct net *net;
1933
1934 if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD])
1935 return rtnl_link_get_net(src_net, tb);
1936
1937 if (!tb[IFLA_IF_NETNSID])
1938 return get_net(src_net);
1939
1940 net = get_net_ns_by_id(src_net, nla_get_u32(tb[IFLA_IF_NETNSID]));
1941 if (!net)
1942 return ERR_PTR(-EINVAL);
1943
1944 return net;
1945}
1946
1947static struct net *rtnl_link_get_net_capable(const struct sk_buff *skb,
1948 struct net *src_net,
1949 struct nlattr *tb[], int cap)
1950{
1951 struct net *net;
1952
1953 net = rtnl_link_get_net_by_nlattr(src_net, tb);
1954 if (IS_ERR(net))
1955 return net;
1956
1957 if (!netlink_ns_capable(skb, net->user_ns, cap)) {
1958 put_net(net);
1959 return ERR_PTR(-EPERM);
1960 }
1961
1962 return net;
1963}
1964
1965/* Verify that rtnetlink requests do not pass additional properties
1966 * potentially referring to different network namespaces.
1967 */
1968static int rtnl_ensure_unique_netns(struct nlattr *tb[],
1969 struct netlink_ext_ack *extack,
1970 bool netns_id_only)
1971{
1972
1973 if (netns_id_only) {
1974 if (!tb[IFLA_NET_NS_PID] && !tb[IFLA_NET_NS_FD])
1975 return 0;
1976
1977 NL_SET_ERR_MSG(extack, "specified netns attribute not supported");
1978 return -EOPNOTSUPP;
1979 }
1980
1981 if (tb[IFLA_IF_NETNSID] && (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD]))
1982 goto invalid_attr;
1983
1984 if (tb[IFLA_NET_NS_PID] && (tb[IFLA_IF_NETNSID] || tb[IFLA_NET_NS_FD]))
1985 goto invalid_attr;
1986
1987 if (tb[IFLA_NET_NS_FD] && (tb[IFLA_IF_NETNSID] || tb[IFLA_NET_NS_PID]))
1988 goto invalid_attr;
1989
1990 return 0;
1991
1992invalid_attr:
1993 NL_SET_ERR_MSG(extack, "multiple netns identifying attributes specified");
1994 return -EINVAL;
1995}
1996
1997static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[])
1998{
1999 if (dev) {
2000 if (tb[IFLA_ADDRESS] &&
2001 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
2002 return -EINVAL;
2003
2004 if (tb[IFLA_BROADCAST] &&
2005 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
2006 return -EINVAL;
2007 }
2008
2009 if (tb[IFLA_AF_SPEC]) {
2010 struct nlattr *af;
2011 int rem, err;
2012
2013 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
2014 const struct rtnl_af_ops *af_ops;
2015
2016 rcu_read_lock();
2017 af_ops = rtnl_af_lookup(nla_type(af));
2018 if (!af_ops) {
2019 rcu_read_unlock();
2020 return -EAFNOSUPPORT;
2021 }
2022
2023 if (!af_ops->set_link_af) {
2024 rcu_read_unlock();
2025 return -EOPNOTSUPP;
2026 }
2027
2028 if (af_ops->validate_link_af) {
2029 err = af_ops->validate_link_af(dev, af);
2030 if (err < 0) {
2031 rcu_read_unlock();
2032 return err;
2033 }
2034 }
2035
2036 rcu_read_unlock();
2037 }
2038 }
2039
2040 return 0;
2041}
2042
2043static int handle_infiniband_guid(struct net_device *dev, struct ifla_vf_guid *ivt,
2044 int guid_type)
2045{
2046 const struct net_device_ops *ops = dev->netdev_ops;
2047
2048 return ops->ndo_set_vf_guid(dev, ivt->vf, ivt->guid, guid_type);
2049}
2050
2051static int handle_vf_guid(struct net_device *dev, struct ifla_vf_guid *ivt, int guid_type)
2052{
2053 if (dev->type != ARPHRD_INFINIBAND)
2054 return -EOPNOTSUPP;
2055
2056 return handle_infiniband_guid(dev, ivt, guid_type);
2057}
2058
2059static int do_setvfinfo(struct net_device *dev, struct nlattr **tb)
2060{
2061 const struct net_device_ops *ops = dev->netdev_ops;
2062 int err = -EINVAL;
2063
2064 if (tb[IFLA_VF_MAC]) {
2065 struct ifla_vf_mac *ivm = nla_data(tb[IFLA_VF_MAC]);
2066
2067 err = -EOPNOTSUPP;
2068 if (ops->ndo_set_vf_mac)
2069 err = ops->ndo_set_vf_mac(dev, ivm->vf,
2070 ivm->mac);
2071 if (err < 0)
2072 return err;
2073 }
2074
2075 if (tb[IFLA_VF_VLAN]) {
2076 struct ifla_vf_vlan *ivv = nla_data(tb[IFLA_VF_VLAN]);
2077
2078 err = -EOPNOTSUPP;
2079 if (ops->ndo_set_vf_vlan)
2080 err = ops->ndo_set_vf_vlan(dev, ivv->vf, ivv->vlan,
2081 ivv->qos,
2082 htons(ETH_P_8021Q));
2083 if (err < 0)
2084 return err;
2085 }
2086
2087 if (tb[IFLA_VF_VLAN_LIST]) {
2088 struct ifla_vf_vlan_info *ivvl[MAX_VLAN_LIST_LEN];
2089 struct nlattr *attr;
2090 int rem, len = 0;
2091
2092 err = -EOPNOTSUPP;
2093 if (!ops->ndo_set_vf_vlan)
2094 return err;
2095
2096 nla_for_each_nested(attr, tb[IFLA_VF_VLAN_LIST], rem) {
2097 if (nla_type(attr) != IFLA_VF_VLAN_INFO ||
2098 nla_len(attr) < NLA_HDRLEN) {
2099 return -EINVAL;
2100 }
2101 if (len >= MAX_VLAN_LIST_LEN)
2102 return -EOPNOTSUPP;
2103 ivvl[len] = nla_data(attr);
2104
2105 len++;
2106 }
2107 if (len == 0)
2108 return -EINVAL;
2109
2110 err = ops->ndo_set_vf_vlan(dev, ivvl[0]->vf, ivvl[0]->vlan,
2111 ivvl[0]->qos, ivvl[0]->vlan_proto);
2112 if (err < 0)
2113 return err;
2114 }
2115
2116 if (tb[IFLA_VF_TX_RATE]) {
2117 struct ifla_vf_tx_rate *ivt = nla_data(tb[IFLA_VF_TX_RATE]);
2118 struct ifla_vf_info ivf;
2119
2120 err = -EOPNOTSUPP;
2121 if (ops->ndo_get_vf_config)
2122 err = ops->ndo_get_vf_config(dev, ivt->vf, &ivf);
2123 if (err < 0)
2124 return err;
2125
2126 err = -EOPNOTSUPP;
2127 if (ops->ndo_set_vf_rate)
2128 err = ops->ndo_set_vf_rate(dev, ivt->vf,
2129 ivf.min_tx_rate,
2130 ivt->rate);
2131 if (err < 0)
2132 return err;
2133 }
2134
2135 if (tb[IFLA_VF_RATE]) {
2136 struct ifla_vf_rate *ivt = nla_data(tb[IFLA_VF_RATE]);
2137
2138 err = -EOPNOTSUPP;
2139 if (ops->ndo_set_vf_rate)
2140 err = ops->ndo_set_vf_rate(dev, ivt->vf,
2141 ivt->min_tx_rate,
2142 ivt->max_tx_rate);
2143 if (err < 0)
2144 return err;
2145 }
2146
2147 if (tb[IFLA_VF_SPOOFCHK]) {
2148 struct ifla_vf_spoofchk *ivs = nla_data(tb[IFLA_VF_SPOOFCHK]);
2149
2150 err = -EOPNOTSUPP;
2151 if (ops->ndo_set_vf_spoofchk)
2152 err = ops->ndo_set_vf_spoofchk(dev, ivs->vf,
2153 ivs->setting);
2154 if (err < 0)
2155 return err;
2156 }
2157
2158 if (tb[IFLA_VF_LINK_STATE]) {
2159 struct ifla_vf_link_state *ivl = nla_data(tb[IFLA_VF_LINK_STATE]);
2160
2161 err = -EOPNOTSUPP;
2162 if (ops->ndo_set_vf_link_state)
2163 err = ops->ndo_set_vf_link_state(dev, ivl->vf,
2164 ivl->link_state);
2165 if (err < 0)
2166 return err;
2167 }
2168
2169 if (tb[IFLA_VF_RSS_QUERY_EN]) {
2170 struct ifla_vf_rss_query_en *ivrssq_en;
2171
2172 err = -EOPNOTSUPP;
2173 ivrssq_en = nla_data(tb[IFLA_VF_RSS_QUERY_EN]);
2174 if (ops->ndo_set_vf_rss_query_en)
2175 err = ops->ndo_set_vf_rss_query_en(dev, ivrssq_en->vf,
2176 ivrssq_en->setting);
2177 if (err < 0)
2178 return err;
2179 }
2180
2181 if (tb[IFLA_VF_TRUST]) {
2182 struct ifla_vf_trust *ivt = nla_data(tb[IFLA_VF_TRUST]);
2183
2184 err = -EOPNOTSUPP;
2185 if (ops->ndo_set_vf_trust)
2186 err = ops->ndo_set_vf_trust(dev, ivt->vf, ivt->setting);
2187 if (err < 0)
2188 return err;
2189 }
2190
2191 if (tb[IFLA_VF_IB_NODE_GUID]) {
2192 struct ifla_vf_guid *ivt = nla_data(tb[IFLA_VF_IB_NODE_GUID]);
2193
2194 if (!ops->ndo_set_vf_guid)
2195 return -EOPNOTSUPP;
2196
2197 return handle_vf_guid(dev, ivt, IFLA_VF_IB_NODE_GUID);
2198 }
2199
2200 if (tb[IFLA_VF_IB_PORT_GUID]) {
2201 struct ifla_vf_guid *ivt = nla_data(tb[IFLA_VF_IB_PORT_GUID]);
2202
2203 if (!ops->ndo_set_vf_guid)
2204 return -EOPNOTSUPP;
2205
2206 return handle_vf_guid(dev, ivt, IFLA_VF_IB_PORT_GUID);
2207 }
2208
2209 return err;
2210}
2211
2212static int do_set_master(struct net_device *dev, int ifindex,
2213 struct netlink_ext_ack *extack)
2214{
2215 struct net_device *upper_dev = netdev_master_upper_dev_get(dev);
2216 const struct net_device_ops *ops;
2217 int err;
2218
2219 if (upper_dev) {
2220 if (upper_dev->ifindex == ifindex)
2221 return 0;
2222 ops = upper_dev->netdev_ops;
2223 if (ops->ndo_del_slave) {
2224 err = ops->ndo_del_slave(upper_dev, dev);
2225 if (err)
2226 return err;
2227 } else {
2228 return -EOPNOTSUPP;
2229 }
2230 }
2231
2232 if (ifindex) {
2233 upper_dev = __dev_get_by_index(dev_net(dev), ifindex);
2234 if (!upper_dev)
2235 return -EINVAL;
2236 ops = upper_dev->netdev_ops;
2237 if (ops->ndo_add_slave) {
2238 err = ops->ndo_add_slave(upper_dev, dev, extack);
2239 if (err)
2240 return err;
2241 } else {
2242 return -EOPNOTSUPP;
2243 }
2244 }
2245 return 0;
2246}
2247
2248#define DO_SETLINK_MODIFIED 0x01
2249/* notify flag means notify + modified. */
2250#define DO_SETLINK_NOTIFY 0x03
2251static int do_setlink(const struct sk_buff *skb,
2252 struct net_device *dev, struct ifinfomsg *ifm,
2253 struct netlink_ext_ack *extack,
2254 struct nlattr **tb, char *ifname, int status)
2255{
2256 const struct net_device_ops *ops = dev->netdev_ops;
2257 int err;
2258
2259 if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD] || tb[IFLA_IF_NETNSID]) {
2260 struct net *net = rtnl_link_get_net_capable(skb, dev_net(dev),
2261 tb, CAP_NET_ADMIN);
2262 if (IS_ERR(net)) {
2263 err = PTR_ERR(net);
2264 goto errout;
2265 }
2266
2267 err = dev_change_net_namespace(dev, net, ifname);
2268 put_net(net);
2269 if (err)
2270 goto errout;
2271 status |= DO_SETLINK_MODIFIED;
2272 }
2273
2274 if (tb[IFLA_MAP]) {
2275 struct rtnl_link_ifmap *u_map;
2276 struct ifmap k_map;
2277
2278 if (!ops->ndo_set_config) {
2279 err = -EOPNOTSUPP;
2280 goto errout;
2281 }
2282
2283 if (!netif_device_present(dev)) {
2284 err = -ENODEV;
2285 goto errout;
2286 }
2287
2288 u_map = nla_data(tb[IFLA_MAP]);
2289 k_map.mem_start = (unsigned long) u_map->mem_start;
2290 k_map.mem_end = (unsigned long) u_map->mem_end;
2291 k_map.base_addr = (unsigned short) u_map->base_addr;
2292 k_map.irq = (unsigned char) u_map->irq;
2293 k_map.dma = (unsigned char) u_map->dma;
2294 k_map.port = (unsigned char) u_map->port;
2295
2296 err = ops->ndo_set_config(dev, &k_map);
2297 if (err < 0)
2298 goto errout;
2299
2300 status |= DO_SETLINK_NOTIFY;
2301 }
2302
2303 if (tb[IFLA_ADDRESS]) {
2304 struct sockaddr *sa;
2305 int len;
2306
2307 len = sizeof(sa_family_t) + max_t(size_t, dev->addr_len,
2308 sizeof(*sa));
2309 sa = kmalloc(len, GFP_KERNEL);
2310 if (!sa) {
2311 err = -ENOMEM;
2312 goto errout;
2313 }
2314 sa->sa_family = dev->type;
2315 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
2316 dev->addr_len);
2317 err = dev_set_mac_address(dev, sa);
2318 kfree(sa);
2319 if (err)
2320 goto errout;
2321 status |= DO_SETLINK_MODIFIED;
2322 }
2323
2324 if (tb[IFLA_MTU]) {
2325 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
2326 if (err < 0)
2327 goto errout;
2328 status |= DO_SETLINK_MODIFIED;
2329 }
2330
2331 if (tb[IFLA_GROUP]) {
2332 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
2333 status |= DO_SETLINK_NOTIFY;
2334 }
2335
2336 /*
2337 * Interface selected by interface index but interface
2338 * name provided implies that a name change has been
2339 * requested.
2340 */
2341 if (ifm->ifi_index > 0 && ifname[0]) {
2342 err = dev_change_name(dev, ifname);
2343 if (err < 0)
2344 goto errout;
2345 status |= DO_SETLINK_MODIFIED;
2346 }
2347
2348 if (tb[IFLA_IFALIAS]) {
2349 err = dev_set_alias(dev, nla_data(tb[IFLA_IFALIAS]),
2350 nla_len(tb[IFLA_IFALIAS]));
2351 if (err < 0)
2352 goto errout;
2353 status |= DO_SETLINK_NOTIFY;
2354 }
2355
2356 if (tb[IFLA_BROADCAST]) {
2357 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
2358 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
2359 }
2360
2361 if (ifm->ifi_flags || ifm->ifi_change) {
2362 err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
2363 if (err < 0)
2364 goto errout;
2365 }
2366
2367 if (tb[IFLA_MASTER]) {
2368 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]), extack);
2369 if (err)
2370 goto errout;
2371 status |= DO_SETLINK_MODIFIED;
2372 }
2373
2374 if (tb[IFLA_CARRIER]) {
2375 err = dev_change_carrier(dev, nla_get_u8(tb[IFLA_CARRIER]));
2376 if (err)
2377 goto errout;
2378 status |= DO_SETLINK_MODIFIED;
2379 }
2380
2381 if (tb[IFLA_TXQLEN]) {
2382 unsigned int value = nla_get_u32(tb[IFLA_TXQLEN]);
2383
2384 err = dev_change_tx_queue_len(dev, value);
2385 if (err)
2386 goto errout;
2387 status |= DO_SETLINK_MODIFIED;
2388 }
2389
2390 if (tb[IFLA_GSO_MAX_SIZE]) {
2391 u32 max_size = nla_get_u32(tb[IFLA_GSO_MAX_SIZE]);
2392
2393 if (max_size > GSO_MAX_SIZE) {
2394 err = -EINVAL;
2395 goto errout;
2396 }
2397
2398 if (dev->gso_max_size ^ max_size) {
2399 netif_set_gso_max_size(dev, max_size);
2400 status |= DO_SETLINK_MODIFIED;
2401 }
2402 }
2403
2404 if (tb[IFLA_GSO_MAX_SEGS]) {
2405 u32 max_segs = nla_get_u32(tb[IFLA_GSO_MAX_SEGS]);
2406
2407 if (max_segs > GSO_MAX_SEGS) {
2408 err = -EINVAL;
2409 goto errout;
2410 }
2411
2412 if (dev->gso_max_segs ^ max_segs) {
2413 dev->gso_max_segs = max_segs;
2414 status |= DO_SETLINK_MODIFIED;
2415 }
2416 }
2417
2418 if (tb[IFLA_OPERSTATE])
2419 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
2420
2421 if (tb[IFLA_LINKMODE]) {
2422 unsigned char value = nla_get_u8(tb[IFLA_LINKMODE]);
2423
2424 write_lock_bh(&dev_base_lock);
2425 if (dev->link_mode ^ value)
2426 status |= DO_SETLINK_NOTIFY;
2427 dev->link_mode = value;
2428 write_unlock_bh(&dev_base_lock);
2429 }
2430
2431 if (tb[IFLA_VFINFO_LIST]) {
2432 struct nlattr *vfinfo[IFLA_VF_MAX + 1];
2433 struct nlattr *attr;
2434 int rem;
2435
2436 nla_for_each_nested(attr, tb[IFLA_VFINFO_LIST], rem) {
2437 if (nla_type(attr) != IFLA_VF_INFO ||
2438 nla_len(attr) < NLA_HDRLEN) {
2439 err = -EINVAL;
2440 goto errout;
2441 }
2442 err = nla_parse_nested(vfinfo, IFLA_VF_MAX, attr,
2443 ifla_vf_policy, NULL);
2444 if (err < 0)
2445 goto errout;
2446 err = do_setvfinfo(dev, vfinfo);
2447 if (err < 0)
2448 goto errout;
2449 status |= DO_SETLINK_NOTIFY;
2450 }
2451 }
2452 err = 0;
2453
2454 if (tb[IFLA_VF_PORTS]) {
2455 struct nlattr *port[IFLA_PORT_MAX+1];
2456 struct nlattr *attr;
2457 int vf;
2458 int rem;
2459
2460 err = -EOPNOTSUPP;
2461 if (!ops->ndo_set_vf_port)
2462 goto errout;
2463
2464 nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) {
2465 if (nla_type(attr) != IFLA_VF_PORT ||
2466 nla_len(attr) < NLA_HDRLEN) {
2467 err = -EINVAL;
2468 goto errout;
2469 }
2470 err = nla_parse_nested(port, IFLA_PORT_MAX, attr,
2471 ifla_port_policy, NULL);
2472 if (err < 0)
2473 goto errout;
2474 if (!port[IFLA_PORT_VF]) {
2475 err = -EOPNOTSUPP;
2476 goto errout;
2477 }
2478 vf = nla_get_u32(port[IFLA_PORT_VF]);
2479 err = ops->ndo_set_vf_port(dev, vf, port);
2480 if (err < 0)
2481 goto errout;
2482 status |= DO_SETLINK_NOTIFY;
2483 }
2484 }
2485 err = 0;
2486
2487 if (tb[IFLA_PORT_SELF]) {
2488 struct nlattr *port[IFLA_PORT_MAX+1];
2489
2490 err = nla_parse_nested(port, IFLA_PORT_MAX,
2491 tb[IFLA_PORT_SELF], ifla_port_policy,
2492 NULL);
2493 if (err < 0)
2494 goto errout;
2495
2496 err = -EOPNOTSUPP;
2497 if (ops->ndo_set_vf_port)
2498 err = ops->ndo_set_vf_port(dev, PORT_SELF_VF, port);
2499 if (err < 0)
2500 goto errout;
2501 status |= DO_SETLINK_NOTIFY;
2502 }
2503
2504 if (tb[IFLA_AF_SPEC]) {
2505 struct nlattr *af;
2506 int rem;
2507
2508 nla_for_each_nested(af, tb[IFLA_AF_SPEC], rem) {
2509 const struct rtnl_af_ops *af_ops;
2510
2511 rcu_read_lock();
2512
2513 BUG_ON(!(af_ops = rtnl_af_lookup(nla_type(af))));
2514
2515 err = af_ops->set_link_af(dev, af);
2516 if (err < 0) {
2517 rcu_read_unlock();
2518 goto errout;
2519 }
2520
2521 rcu_read_unlock();
2522 status |= DO_SETLINK_NOTIFY;
2523 }
2524 }
2525 err = 0;
2526
2527 if (tb[IFLA_PROTO_DOWN]) {
2528 err = dev_change_proto_down(dev,
2529 nla_get_u8(tb[IFLA_PROTO_DOWN]));
2530 if (err)
2531 goto errout;
2532 status |= DO_SETLINK_NOTIFY;
2533 }
2534
2535 if (tb[IFLA_XDP]) {
2536 struct nlattr *xdp[IFLA_XDP_MAX + 1];
2537 u32 xdp_flags = 0;
2538
2539 err = nla_parse_nested(xdp, IFLA_XDP_MAX, tb[IFLA_XDP],
2540 ifla_xdp_policy, NULL);
2541 if (err < 0)
2542 goto errout;
2543
2544 if (xdp[IFLA_XDP_ATTACHED] || xdp[IFLA_XDP_PROG_ID]) {
2545 err = -EINVAL;
2546 goto errout;
2547 }
2548
2549 if (xdp[IFLA_XDP_FLAGS]) {
2550 xdp_flags = nla_get_u32(xdp[IFLA_XDP_FLAGS]);
2551 if (xdp_flags & ~XDP_FLAGS_MASK) {
2552 err = -EINVAL;
2553 goto errout;
2554 }
2555 if (hweight32(xdp_flags & XDP_FLAGS_MODES) > 1) {
2556 err = -EINVAL;
2557 goto errout;
2558 }
2559 }
2560
2561 if (xdp[IFLA_XDP_FD]) {
2562 err = dev_change_xdp_fd(dev, extack,
2563 nla_get_s32(xdp[IFLA_XDP_FD]),
2564 xdp_flags);
2565 if (err)
2566 goto errout;
2567 status |= DO_SETLINK_NOTIFY;
2568 }
2569 }
2570
2571errout:
2572 if (status & DO_SETLINK_MODIFIED) {
2573 if ((status & DO_SETLINK_NOTIFY) == DO_SETLINK_NOTIFY)
2574 netdev_state_change(dev);
2575
2576 if (err < 0)
2577 net_warn_ratelimited("A link change request failed with some changes committed already. Interface %s may have been left with an inconsistent configuration, please check.\n",
2578 dev->name);
2579 }
2580
2581 return err;
2582}
2583
2584static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh,
2585 struct netlink_ext_ack *extack)
2586{
2587 struct net *net = sock_net(skb->sk);
2588 struct ifinfomsg *ifm;
2589 struct net_device *dev;
2590 int err;
2591 struct nlattr *tb[IFLA_MAX+1];
2592 char ifname[IFNAMSIZ];
2593
2594 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy,
2595 extack);
2596 if (err < 0)
2597 goto errout;
2598
2599 err = rtnl_ensure_unique_netns(tb, extack, false);
2600 if (err < 0)
2601 goto errout;
2602
2603 if (tb[IFLA_IFNAME])
2604 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
2605 else
2606 ifname[0] = '\0';
2607
2608 err = -EINVAL;
2609 ifm = nlmsg_data(nlh);
2610 if (ifm->ifi_index > 0)
2611 dev = __dev_get_by_index(net, ifm->ifi_index);
2612 else if (tb[IFLA_IFNAME])
2613 dev = __dev_get_by_name(net, ifname);
2614 else
2615 goto errout;
2616
2617 if (dev == NULL) {
2618 err = -ENODEV;
2619 goto errout;
2620 }
2621
2622 err = validate_linkmsg(dev, tb);
2623 if (err < 0)
2624 goto errout;
2625
2626 err = do_setlink(skb, dev, ifm, extack, tb, ifname, 0);
2627errout:
2628 return err;
2629}
2630
2631static int rtnl_group_dellink(const struct net *net, int group)
2632{
2633 struct net_device *dev, *aux;
2634 LIST_HEAD(list_kill);
2635 bool found = false;
2636
2637 if (!group)
2638 return -EPERM;
2639
2640 for_each_netdev(net, dev) {
2641 if (dev->group == group) {
2642 const struct rtnl_link_ops *ops;
2643
2644 found = true;
2645 ops = dev->rtnl_link_ops;
2646 if (!ops || !ops->dellink)
2647 return -EOPNOTSUPP;
2648 }
2649 }
2650
2651 if (!found)
2652 return -ENODEV;
2653
2654 for_each_netdev_safe(net, dev, aux) {
2655 if (dev->group == group) {
2656 const struct rtnl_link_ops *ops;
2657
2658 ops = dev->rtnl_link_ops;
2659 ops->dellink(dev, &list_kill);
2660 }
2661 }
2662 unregister_netdevice_many(&list_kill);
2663
2664 return 0;
2665}
2666
2667int rtnl_delete_link(struct net_device *dev)
2668{
2669 const struct rtnl_link_ops *ops;
2670 LIST_HEAD(list_kill);
2671
2672 ops = dev->rtnl_link_ops;
2673 if (!ops || !ops->dellink)
2674 return -EOPNOTSUPP;
2675
2676 ops->dellink(dev, &list_kill);
2677 unregister_netdevice_many(&list_kill);
2678
2679 return 0;
2680}
2681EXPORT_SYMBOL_GPL(rtnl_delete_link);
2682
2683static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh,
2684 struct netlink_ext_ack *extack)
2685{
2686 struct net *net = sock_net(skb->sk);
2687 struct net *tgt_net = net;
2688 struct net_device *dev = NULL;
2689 struct ifinfomsg *ifm;
2690 char ifname[IFNAMSIZ];
2691 struct nlattr *tb[IFLA_MAX+1];
2692 int err;
2693 int netnsid = -1;
2694
2695 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy, extack);
2696 if (err < 0)
2697 return err;
2698
2699 err = rtnl_ensure_unique_netns(tb, extack, true);
2700 if (err < 0)
2701 return err;
2702
2703 if (tb[IFLA_IFNAME])
2704 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
2705
2706 if (tb[IFLA_IF_NETNSID]) {
2707 netnsid = nla_get_s32(tb[IFLA_IF_NETNSID]);
2708 tgt_net = get_target_net(NETLINK_CB(skb).sk, netnsid);
2709 if (IS_ERR(tgt_net))
2710 return PTR_ERR(tgt_net);
2711 }
2712
2713 err = -EINVAL;
2714 ifm = nlmsg_data(nlh);
2715 if (ifm->ifi_index > 0)
2716 dev = __dev_get_by_index(tgt_net, ifm->ifi_index);
2717 else if (tb[IFLA_IFNAME])
2718 dev = __dev_get_by_name(tgt_net, ifname);
2719 else if (tb[IFLA_GROUP])
2720 err = rtnl_group_dellink(tgt_net, nla_get_u32(tb[IFLA_GROUP]));
2721 else
2722 goto out;
2723
2724 if (!dev) {
2725 if (tb[IFLA_IFNAME] || ifm->ifi_index > 0)
2726 err = -ENODEV;
2727
2728 goto out;
2729 }
2730
2731 err = rtnl_delete_link(dev);
2732
2733out:
2734 if (netnsid >= 0)
2735 put_net(tgt_net);
2736
2737 return err;
2738}
2739
2740int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm)
2741{
2742 unsigned int old_flags;
2743 int err;
2744
2745 old_flags = dev->flags;
2746 if (ifm && (ifm->ifi_flags || ifm->ifi_change)) {
2747 err = __dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm));
2748 if (err < 0)
2749 return err;
2750 }
2751
2752 dev->rtnl_link_state = RTNL_LINK_INITIALIZED;
2753
2754 __dev_notify_flags(dev, old_flags, ~0U);
2755 return 0;
2756}
2757EXPORT_SYMBOL(rtnl_configure_link);
2758
2759struct net_device *rtnl_create_link(struct net *net,
2760 const char *ifname, unsigned char name_assign_type,
2761 const struct rtnl_link_ops *ops, struct nlattr *tb[])
2762{
2763 struct net_device *dev;
2764 unsigned int num_tx_queues = 1;
2765 unsigned int num_rx_queues = 1;
2766
2767 if (tb[IFLA_NUM_TX_QUEUES])
2768 num_tx_queues = nla_get_u32(tb[IFLA_NUM_TX_QUEUES]);
2769 else if (ops->get_num_tx_queues)
2770 num_tx_queues = ops->get_num_tx_queues();
2771
2772 if (tb[IFLA_NUM_RX_QUEUES])
2773 num_rx_queues = nla_get_u32(tb[IFLA_NUM_RX_QUEUES]);
2774 else if (ops->get_num_rx_queues)
2775 num_rx_queues = ops->get_num_rx_queues();
2776
2777 dev = alloc_netdev_mqs(ops->priv_size, ifname, name_assign_type,
2778 ops->setup, num_tx_queues, num_rx_queues);
2779 if (!dev)
2780 return ERR_PTR(-ENOMEM);
2781
2782 dev_net_set(dev, net);
2783 dev->rtnl_link_ops = ops;
2784 dev->rtnl_link_state = RTNL_LINK_INITIALIZING;
2785
2786 if (tb[IFLA_MTU])
2787 dev->mtu = nla_get_u32(tb[IFLA_MTU]);
2788 if (tb[IFLA_ADDRESS]) {
2789 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]),
2790 nla_len(tb[IFLA_ADDRESS]));
2791 dev->addr_assign_type = NET_ADDR_SET;
2792 }
2793 if (tb[IFLA_BROADCAST])
2794 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]),
2795 nla_len(tb[IFLA_BROADCAST]));
2796 if (tb[IFLA_TXQLEN])
2797 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
2798 if (tb[IFLA_OPERSTATE])
2799 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
2800 if (tb[IFLA_LINKMODE])
2801 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
2802 if (tb[IFLA_GROUP])
2803 dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
2804 if (tb[IFLA_GSO_MAX_SIZE])
2805 netif_set_gso_max_size(dev, nla_get_u32(tb[IFLA_GSO_MAX_SIZE]));
2806 if (tb[IFLA_GSO_MAX_SEGS])
2807 dev->gso_max_segs = nla_get_u32(tb[IFLA_GSO_MAX_SEGS]);
2808
2809 return dev;
2810}
2811EXPORT_SYMBOL(rtnl_create_link);
2812
2813static int rtnl_group_changelink(const struct sk_buff *skb,
2814 struct net *net, int group,
2815 struct ifinfomsg *ifm,
2816 struct netlink_ext_ack *extack,
2817 struct nlattr **tb)
2818{
2819 struct net_device *dev, *aux;
2820 int err;
2821
2822 for_each_netdev_safe(net, dev, aux) {
2823 if (dev->group == group) {
2824 err = do_setlink(skb, dev, ifm, extack, tb, NULL, 0);
2825 if (err < 0)
2826 return err;
2827 }
2828 }
2829
2830 return 0;
2831}
2832
2833static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh,
2834 struct netlink_ext_ack *extack)
2835{
2836 struct net *net = sock_net(skb->sk);
2837 const struct rtnl_link_ops *ops;
2838 const struct rtnl_link_ops *m_ops = NULL;
2839 struct net_device *dev;
2840 struct net_device *master_dev = NULL;
2841 struct ifinfomsg *ifm;
2842 char kind[MODULE_NAME_LEN];
2843 char ifname[IFNAMSIZ];
2844 struct nlattr *tb[IFLA_MAX+1];
2845 struct nlattr *linkinfo[IFLA_INFO_MAX+1];
2846 unsigned char name_assign_type = NET_NAME_USER;
2847 int err;
2848
2849#ifdef CONFIG_MODULES
2850replay:
2851#endif
2852 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy, extack);
2853 if (err < 0)
2854 return err;
2855
2856 err = rtnl_ensure_unique_netns(tb, extack, false);
2857 if (err < 0)
2858 return err;
2859
2860 if (tb[IFLA_IFNAME])
2861 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
2862 else
2863 ifname[0] = '\0';
2864
2865 ifm = nlmsg_data(nlh);
2866 if (ifm->ifi_index > 0)
2867 dev = __dev_get_by_index(net, ifm->ifi_index);
2868 else {
2869 if (ifname[0])
2870 dev = __dev_get_by_name(net, ifname);
2871 else
2872 dev = NULL;
2873 }
2874
2875 if (dev) {
2876 master_dev = netdev_master_upper_dev_get(dev);
2877 if (master_dev)
2878 m_ops = master_dev->rtnl_link_ops;
2879 }
2880
2881 err = validate_linkmsg(dev, tb);
2882 if (err < 0)
2883 return err;
2884
2885 if (tb[IFLA_LINKINFO]) {
2886 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX,
2887 tb[IFLA_LINKINFO], ifla_info_policy,
2888 NULL);
2889 if (err < 0)
2890 return err;
2891 } else
2892 memset(linkinfo, 0, sizeof(linkinfo));
2893
2894 if (linkinfo[IFLA_INFO_KIND]) {
2895 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind));
2896 ops = rtnl_link_ops_get(kind);
2897 } else {
2898 kind[0] = '\0';
2899 ops = NULL;
2900 }
2901
2902 if (1) {
2903 struct nlattr *attr[ops ? ops->maxtype + 1 : 1];
2904 struct nlattr *slave_attr[m_ops ? m_ops->slave_maxtype + 1 : 1];
2905 struct nlattr **data = NULL;
2906 struct nlattr **slave_data = NULL;
2907 struct net *dest_net, *link_net = NULL;
2908
2909 if (ops) {
2910 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
2911 err = nla_parse_nested(attr, ops->maxtype,
2912 linkinfo[IFLA_INFO_DATA],
2913 ops->policy, NULL);
2914 if (err < 0)
2915 return err;
2916 data = attr;
2917 }
2918 if (ops->validate) {
2919 err = ops->validate(tb, data, extack);
2920 if (err < 0)
2921 return err;
2922 }
2923 }
2924
2925 if (m_ops) {
2926 if (m_ops->slave_maxtype &&
2927 linkinfo[IFLA_INFO_SLAVE_DATA]) {
2928 err = nla_parse_nested(slave_attr,
2929 m_ops->slave_maxtype,
2930 linkinfo[IFLA_INFO_SLAVE_DATA],
2931 m_ops->slave_policy,
2932 NULL);
2933 if (err < 0)
2934 return err;
2935 slave_data = slave_attr;
2936 }
2937 }
2938
2939 if (dev) {
2940 int status = 0;
2941
2942 if (nlh->nlmsg_flags & NLM_F_EXCL)
2943 return -EEXIST;
2944 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2945 return -EOPNOTSUPP;
2946
2947 if (linkinfo[IFLA_INFO_DATA]) {
2948 if (!ops || ops != dev->rtnl_link_ops ||
2949 !ops->changelink)
2950 return -EOPNOTSUPP;
2951
2952 err = ops->changelink(dev, tb, data, extack);
2953 if (err < 0)
2954 return err;
2955 status |= DO_SETLINK_NOTIFY;
2956 }
2957
2958 if (linkinfo[IFLA_INFO_SLAVE_DATA]) {
2959 if (!m_ops || !m_ops->slave_changelink)
2960 return -EOPNOTSUPP;
2961
2962 err = m_ops->slave_changelink(master_dev, dev,
2963 tb, slave_data,
2964 extack);
2965 if (err < 0)
2966 return err;
2967 status |= DO_SETLINK_NOTIFY;
2968 }
2969
2970 return do_setlink(skb, dev, ifm, extack, tb, ifname,
2971 status);
2972 }
2973
2974 if (!(nlh->nlmsg_flags & NLM_F_CREATE)) {
2975 if (ifm->ifi_index == 0 && tb[IFLA_GROUP])
2976 return rtnl_group_changelink(skb, net,
2977 nla_get_u32(tb[IFLA_GROUP]),
2978 ifm, extack, tb);
2979 return -ENODEV;
2980 }
2981
2982 if (tb[IFLA_MAP] || tb[IFLA_PROTINFO])
2983 return -EOPNOTSUPP;
2984
2985 if (!ops) {
2986#ifdef CONFIG_MODULES
2987 if (kind[0]) {
2988 __rtnl_unlock();
2989 request_module("rtnl-link-%s", kind);
2990 rtnl_lock();
2991 ops = rtnl_link_ops_get(kind);
2992 if (ops)
2993 goto replay;
2994 }
2995#endif
2996 return -EOPNOTSUPP;
2997 }
2998
2999 if (!ops->setup)
3000 return -EOPNOTSUPP;
3001
3002 if (!ifname[0]) {
3003 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
3004 name_assign_type = NET_NAME_ENUM;
3005 }
3006
3007 dest_net = rtnl_link_get_net_capable(skb, net, tb, CAP_NET_ADMIN);
3008 if (IS_ERR(dest_net))
3009 return PTR_ERR(dest_net);
3010
3011 if (tb[IFLA_LINK_NETNSID]) {
3012 int id = nla_get_s32(tb[IFLA_LINK_NETNSID]);
3013
3014 link_net = get_net_ns_by_id(dest_net, id);
3015 if (!link_net) {
3016 err = -EINVAL;
3017 goto out;
3018 }
3019 err = -EPERM;
3020 if (!netlink_ns_capable(skb, link_net->user_ns, CAP_NET_ADMIN))
3021 goto out;
3022 }
3023
3024 dev = rtnl_create_link(link_net ? : dest_net, ifname,
3025 name_assign_type, ops, tb);
3026 if (IS_ERR(dev)) {
3027 err = PTR_ERR(dev);
3028 goto out;
3029 }
3030
3031 dev->ifindex = ifm->ifi_index;
3032
3033 if (ops->newlink) {
3034 err = ops->newlink(link_net ? : net, dev, tb, data,
3035 extack);
3036 /* Drivers should call free_netdev() in ->destructor
3037 * and unregister it on failure after registration
3038 * so that device could be finally freed in rtnl_unlock.
3039 */
3040 if (err < 0) {
3041 /* If device is not registered at all, free it now */
3042 if (dev->reg_state == NETREG_UNINITIALIZED)
3043 free_netdev(dev);
3044 goto out;
3045 }
3046 } else {
3047 err = register_netdevice(dev);
3048 if (err < 0) {
3049 free_netdev(dev);
3050 goto out;
3051 }
3052 }
3053 err = rtnl_configure_link(dev, ifm);
3054 if (err < 0)
3055 goto out_unregister;
3056 if (link_net) {
3057 err = dev_change_net_namespace(dev, dest_net, ifname);
3058 if (err < 0)
3059 goto out_unregister;
3060 }
3061 if (tb[IFLA_MASTER]) {
3062 err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]),
3063 extack);
3064 if (err)
3065 goto out_unregister;
3066 }
3067out:
3068 if (link_net)
3069 put_net(link_net);
3070 put_net(dest_net);
3071 return err;
3072out_unregister:
3073 if (ops->newlink) {
3074 LIST_HEAD(list_kill);
3075
3076 ops->dellink(dev, &list_kill);
3077 unregister_netdevice_many(&list_kill);
3078 } else {
3079 unregister_netdevice(dev);
3080 }
3081 goto out;
3082 }
3083}
3084
3085static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr *nlh,
3086 struct netlink_ext_ack *extack)
3087{
3088 struct net *net = sock_net(skb->sk);
3089 struct net *tgt_net = net;
3090 struct ifinfomsg *ifm;
3091 char ifname[IFNAMSIZ];
3092 struct nlattr *tb[IFLA_MAX+1];
3093 struct net_device *dev = NULL;
3094 struct sk_buff *nskb;
3095 int netnsid = -1;
3096 int err;
3097 u32 ext_filter_mask = 0;
3098
3099 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy, extack);
3100 if (err < 0)
3101 return err;
3102
3103 err = rtnl_ensure_unique_netns(tb, extack, true);
3104 if (err < 0)
3105 return err;
3106
3107 if (tb[IFLA_IF_NETNSID]) {
3108 netnsid = nla_get_s32(tb[IFLA_IF_NETNSID]);
3109 tgt_net = get_target_net(NETLINK_CB(skb).sk, netnsid);
3110 if (IS_ERR(tgt_net))
3111 return PTR_ERR(tgt_net);
3112 }
3113
3114 if (tb[IFLA_IFNAME])
3115 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
3116
3117 if (tb[IFLA_EXT_MASK])
3118 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
3119
3120 err = -EINVAL;
3121 ifm = nlmsg_data(nlh);
3122 if (ifm->ifi_index > 0)
3123 dev = __dev_get_by_index(tgt_net, ifm->ifi_index);
3124 else if (tb[IFLA_IFNAME])
3125 dev = __dev_get_by_name(tgt_net, ifname);
3126 else
3127 goto out;
3128
3129 err = -ENODEV;
3130 if (dev == NULL)
3131 goto out;
3132
3133 err = -ENOBUFS;
3134 nskb = nlmsg_new(if_nlmsg_size(dev, ext_filter_mask), GFP_KERNEL);
3135 if (nskb == NULL)
3136 goto out;
3137
3138 err = rtnl_fill_ifinfo(nskb, dev, net,
3139 RTM_NEWLINK, NETLINK_CB(skb).portid,
3140 nlh->nlmsg_seq, 0, 0, ext_filter_mask,
3141 0, NULL, 0, netnsid);
3142 if (err < 0) {
3143 /* -EMSGSIZE implies BUG in if_nlmsg_size */
3144 WARN_ON(err == -EMSGSIZE);
3145 kfree_skb(nskb);
3146 } else
3147 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid);
3148out:
3149 if (netnsid >= 0)
3150 put_net(tgt_net);
3151
3152 return err;
3153}
3154
3155static u16 rtnl_calcit(struct sk_buff *skb, struct nlmsghdr *nlh)
3156{
3157 struct net *net = sock_net(skb->sk);
3158 struct net_device *dev;
3159 struct nlattr *tb[IFLA_MAX+1];
3160 u32 ext_filter_mask = 0;
3161 u16 min_ifinfo_dump_size = 0;
3162 int hdrlen;
3163
3164 /* Same kernel<->userspace interface hack as in rtnl_dump_ifinfo. */
3165 hdrlen = nlmsg_len(nlh) < sizeof(struct ifinfomsg) ?
3166 sizeof(struct rtgenmsg) : sizeof(struct ifinfomsg);
3167
3168 if (nlmsg_parse(nlh, hdrlen, tb, IFLA_MAX, ifla_policy, NULL) >= 0) {
3169 if (tb[IFLA_EXT_MASK])
3170 ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
3171 }
3172
3173 if (!ext_filter_mask)
3174 return NLMSG_GOODSIZE;
3175 /*
3176 * traverse the list of net devices and compute the minimum
3177 * buffer size based upon the filter mask.
3178 */
3179 rcu_read_lock();
3180 for_each_netdev_rcu(net, dev) {
3181 min_ifinfo_dump_size = max_t(u16, min_ifinfo_dump_size,
3182 if_nlmsg_size(dev,
3183 ext_filter_mask));
3184 }
3185 rcu_read_unlock();
3186
3187 return nlmsg_total_size(min_ifinfo_dump_size);
3188}
3189
3190static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
3191{
3192 int idx;
3193 int s_idx = cb->family;
3194
3195 if (s_idx == 0)
3196 s_idx = 1;
3197
3198 for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) {
3199 struct rtnl_link **tab;
3200 int type = cb->nlh->nlmsg_type-RTM_BASE;
3201 struct rtnl_link *link;
3202 rtnl_dumpit_func dumpit;
3203
3204 if (idx < s_idx || idx == PF_PACKET)
3205 continue;
3206
3207 if (type < 0 || type >= RTM_NR_MSGTYPES)
3208 continue;
3209
3210 tab = rcu_dereference_rtnl(rtnl_msg_handlers[idx]);
3211 if (!tab)
3212 continue;
3213
3214 link = tab[type];
3215 if (!link)
3216 continue;
3217
3218 dumpit = link->dumpit;
3219 if (!dumpit)
3220 continue;
3221
3222 if (idx > s_idx) {
3223 memset(&cb->args[0], 0, sizeof(cb->args));
3224 cb->prev_seq = 0;
3225 cb->seq = 0;
3226 }
3227 if (dumpit(skb, cb))
3228 break;
3229 }
3230 cb->family = idx;
3231
3232 return skb->len;
3233}
3234
3235struct sk_buff *rtmsg_ifinfo_build_skb(int type, struct net_device *dev,
3236 unsigned int change,
3237 u32 event, gfp_t flags, int *new_nsid,
3238 int new_ifindex)
3239{
3240 struct net *net = dev_net(dev);
3241 struct sk_buff *skb;
3242 int err = -ENOBUFS;
3243 size_t if_info_size;
3244
3245 skb = nlmsg_new((if_info_size = if_nlmsg_size(dev, 0)), flags);
3246 if (skb == NULL)
3247 goto errout;
3248
3249 err = rtnl_fill_ifinfo(skb, dev, dev_net(dev),
3250 type, 0, 0, change, 0, 0, event,
3251 new_nsid, new_ifindex, -1);
3252 if (err < 0) {
3253 /* -EMSGSIZE implies BUG in if_nlmsg_size() */
3254 WARN_ON(err == -EMSGSIZE);
3255 kfree_skb(skb);
3256 goto errout;
3257 }
3258 return skb;
3259errout:
3260 if (err < 0)
3261 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
3262 return NULL;
3263}
3264
3265void rtmsg_ifinfo_send(struct sk_buff *skb, struct net_device *dev, gfp_t flags)
3266{
3267 struct net *net = dev_net(dev);
3268
3269 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, flags);
3270}
3271
3272static void rtmsg_ifinfo_event(int type, struct net_device *dev,
3273 unsigned int change, u32 event,
3274 gfp_t flags, int *new_nsid, int new_ifindex)
3275{
3276 struct sk_buff *skb;
3277
3278 if (dev->reg_state != NETREG_REGISTERED)
3279 return;
3280
3281 skb = rtmsg_ifinfo_build_skb(type, dev, change, event, flags, new_nsid,
3282 new_ifindex);
3283 if (skb)
3284 rtmsg_ifinfo_send(skb, dev, flags);
3285}
3286
3287void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change,
3288 gfp_t flags)
3289{
3290 rtmsg_ifinfo_event(type, dev, change, rtnl_get_event(0), flags,
3291 NULL, 0);
3292}
3293
3294void rtmsg_ifinfo_newnet(int type, struct net_device *dev, unsigned int change,
3295 gfp_t flags, int *new_nsid, int new_ifindex)
3296{
3297 rtmsg_ifinfo_event(type, dev, change, rtnl_get_event(0), flags,
3298 new_nsid, new_ifindex);
3299}
3300
3301static int nlmsg_populate_fdb_fill(struct sk_buff *skb,
3302 struct net_device *dev,
3303 u8 *addr, u16 vid, u32 pid, u32 seq,
3304 int type, unsigned int flags,
3305 int nlflags, u16 ndm_state)
3306{
3307 struct nlmsghdr *nlh;
3308 struct ndmsg *ndm;
3309
3310 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), nlflags);
3311 if (!nlh)
3312 return -EMSGSIZE;
3313
3314 ndm = nlmsg_data(nlh);
3315 ndm->ndm_family = AF_BRIDGE;
3316 ndm->ndm_pad1 = 0;
3317 ndm->ndm_pad2 = 0;
3318 ndm->ndm_flags = flags;
3319 ndm->ndm_type = 0;
3320 ndm->ndm_ifindex = dev->ifindex;
3321 ndm->ndm_state = ndm_state;
3322
3323 if (nla_put(skb, NDA_LLADDR, ETH_ALEN, addr))
3324 goto nla_put_failure;
3325 if (vid)
3326 if (nla_put(skb, NDA_VLAN, sizeof(u16), &vid))
3327 goto nla_put_failure;
3328
3329 nlmsg_end(skb, nlh);
3330 return 0;
3331
3332nla_put_failure:
3333 nlmsg_cancel(skb, nlh);
3334 return -EMSGSIZE;
3335}
3336
3337static inline size_t rtnl_fdb_nlmsg_size(void)
3338{
3339 return NLMSG_ALIGN(sizeof(struct ndmsg)) +
3340 nla_total_size(ETH_ALEN) + /* NDA_LLADDR */
3341 nla_total_size(sizeof(u16)) + /* NDA_VLAN */
3342 0;
3343}
3344
3345static void rtnl_fdb_notify(struct net_device *dev, u8 *addr, u16 vid, int type,
3346 u16 ndm_state)
3347{
3348 struct net *net = dev_net(dev);
3349 struct sk_buff *skb;
3350 int err = -ENOBUFS;
3351
3352 skb = nlmsg_new(rtnl_fdb_nlmsg_size(), GFP_ATOMIC);
3353 if (!skb)
3354 goto errout;
3355
3356 err = nlmsg_populate_fdb_fill(skb, dev, addr, vid,
3357 0, 0, type, NTF_SELF, 0, ndm_state);
3358 if (err < 0) {
3359 kfree_skb(skb);
3360 goto errout;
3361 }
3362
3363 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
3364 return;
3365errout:
3366 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
3367}
3368
3369/**
3370 * ndo_dflt_fdb_add - default netdevice operation to add an FDB entry
3371 */
3372int ndo_dflt_fdb_add(struct ndmsg *ndm,
3373 struct nlattr *tb[],
3374 struct net_device *dev,
3375 const unsigned char *addr, u16 vid,
3376 u16 flags)
3377{
3378 int err = -EINVAL;
3379
3380 /* If aging addresses are supported device will need to
3381 * implement its own handler for this.
3382 */
3383 if (ndm->ndm_state && !(ndm->ndm_state & NUD_PERMANENT)) {
3384 pr_info("%s: FDB only supports static addresses\n", dev->name);
3385 return err;
3386 }
3387
3388 if (vid) {
3389 pr_info("%s: vlans aren't supported yet for dev_uc|mc_add()\n", dev->name);
3390 return err;
3391 }
3392
3393 if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
3394 err = dev_uc_add_excl(dev, addr);
3395 else if (is_multicast_ether_addr(addr))
3396 err = dev_mc_add_excl(dev, addr);
3397
3398 /* Only return duplicate errors if NLM_F_EXCL is set */
3399 if (err == -EEXIST && !(flags & NLM_F_EXCL))
3400 err = 0;
3401
3402 return err;
3403}
3404EXPORT_SYMBOL(ndo_dflt_fdb_add);
3405
3406static int fdb_vid_parse(struct nlattr *vlan_attr, u16 *p_vid,
3407 struct netlink_ext_ack *extack)
3408{
3409 u16 vid = 0;
3410
3411 if (vlan_attr) {
3412 if (nla_len(vlan_attr) != sizeof(u16)) {
3413 NL_SET_ERR_MSG(extack, "invalid vlan attribute size");
3414 return -EINVAL;
3415 }
3416
3417 vid = nla_get_u16(vlan_attr);
3418
3419 if (!vid || vid >= VLAN_VID_MASK) {
3420 NL_SET_ERR_MSG(extack, "invalid vlan id");
3421 return -EINVAL;
3422 }
3423 }
3424 *p_vid = vid;
3425 return 0;
3426}
3427
3428static int rtnl_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh,
3429 struct netlink_ext_ack *extack)
3430{
3431 struct net *net = sock_net(skb->sk);
3432 struct ndmsg *ndm;
3433 struct nlattr *tb[NDA_MAX+1];
3434 struct net_device *dev;
3435 u8 *addr;
3436 u16 vid;
3437 int err;
3438
3439 err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL, extack);
3440 if (err < 0)
3441 return err;
3442
3443 ndm = nlmsg_data(nlh);
3444 if (ndm->ndm_ifindex == 0) {
3445 NL_SET_ERR_MSG(extack, "invalid ifindex");
3446 return -EINVAL;
3447 }
3448
3449 dev = __dev_get_by_index(net, ndm->ndm_ifindex);
3450 if (dev == NULL) {
3451 NL_SET_ERR_MSG(extack, "unknown ifindex");
3452 return -ENODEV;
3453 }
3454
3455 if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
3456 NL_SET_ERR_MSG(extack, "invalid address");
3457 return -EINVAL;
3458 }
3459
3460 addr = nla_data(tb[NDA_LLADDR]);
3461
3462 err = fdb_vid_parse(tb[NDA_VLAN], &vid, extack);
3463 if (err)
3464 return err;
3465
3466 err = -EOPNOTSUPP;
3467
3468 /* Support fdb on master device the net/bridge default case */
3469 if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
3470 (dev->priv_flags & IFF_BRIDGE_PORT)) {
3471 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
3472 const struct net_device_ops *ops = br_dev->netdev_ops;
3473
3474 err = ops->ndo_fdb_add(ndm, tb, dev, addr, vid,
3475 nlh->nlmsg_flags);
3476 if (err)
3477 goto out;
3478 else
3479 ndm->ndm_flags &= ~NTF_MASTER;
3480 }
3481
3482 /* Embedded bridge, macvlan, and any other device support */
3483 if ((ndm->ndm_flags & NTF_SELF)) {
3484 if (dev->netdev_ops->ndo_fdb_add)
3485 err = dev->netdev_ops->ndo_fdb_add(ndm, tb, dev, addr,
3486 vid,
3487 nlh->nlmsg_flags);
3488 else
3489 err = ndo_dflt_fdb_add(ndm, tb, dev, addr, vid,
3490 nlh->nlmsg_flags);
3491
3492 if (!err) {
3493 rtnl_fdb_notify(dev, addr, vid, RTM_NEWNEIGH,
3494 ndm->ndm_state);
3495 ndm->ndm_flags &= ~NTF_SELF;
3496 }
3497 }
3498out:
3499 return err;
3500}
3501
3502/**
3503 * ndo_dflt_fdb_del - default netdevice operation to delete an FDB entry
3504 */
3505int ndo_dflt_fdb_del(struct ndmsg *ndm,
3506 struct nlattr *tb[],
3507 struct net_device *dev,
3508 const unsigned char *addr, u16 vid)
3509{
3510 int err = -EINVAL;
3511
3512 /* If aging addresses are supported device will need to
3513 * implement its own handler for this.
3514 */
3515 if (!(ndm->ndm_state & NUD_PERMANENT)) {
3516 pr_info("%s: FDB only supports static addresses\n", dev->name);
3517 return err;
3518 }
3519
3520 if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
3521 err = dev_uc_del(dev, addr);
3522 else if (is_multicast_ether_addr(addr))
3523 err = dev_mc_del(dev, addr);
3524
3525 return err;
3526}
3527EXPORT_SYMBOL(ndo_dflt_fdb_del);
3528
3529static int rtnl_fdb_del(struct sk_buff *skb, struct nlmsghdr *nlh,
3530 struct netlink_ext_ack *extack)
3531{
3532 struct net *net = sock_net(skb->sk);
3533 struct ndmsg *ndm;
3534 struct nlattr *tb[NDA_MAX+1];
3535 struct net_device *dev;
3536 int err = -EINVAL;
3537 __u8 *addr;
3538 u16 vid;
3539
3540 if (!netlink_capable(skb, CAP_NET_ADMIN))
3541 return -EPERM;
3542
3543 err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL, extack);
3544 if (err < 0)
3545 return err;
3546
3547 ndm = nlmsg_data(nlh);
3548 if (ndm->ndm_ifindex == 0) {
3549 NL_SET_ERR_MSG(extack, "invalid ifindex");
3550 return -EINVAL;
3551 }
3552
3553 dev = __dev_get_by_index(net, ndm->ndm_ifindex);
3554 if (dev == NULL) {
3555 NL_SET_ERR_MSG(extack, "unknown ifindex");
3556 return -ENODEV;
3557 }
3558
3559 if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) {
3560 NL_SET_ERR_MSG(extack, "invalid address");
3561 return -EINVAL;
3562 }
3563
3564 addr = nla_data(tb[NDA_LLADDR]);
3565
3566 err = fdb_vid_parse(tb[NDA_VLAN], &vid, extack);
3567 if (err)
3568 return err;
3569
3570 err = -EOPNOTSUPP;
3571
3572 /* Support fdb on master device the net/bridge default case */
3573 if ((!ndm->ndm_flags || ndm->ndm_flags & NTF_MASTER) &&
3574 (dev->priv_flags & IFF_BRIDGE_PORT)) {
3575 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
3576 const struct net_device_ops *ops = br_dev->netdev_ops;
3577
3578 if (ops->ndo_fdb_del)
3579 err = ops->ndo_fdb_del(ndm, tb, dev, addr, vid);
3580
3581 if (err)
3582 goto out;
3583 else
3584 ndm->ndm_flags &= ~NTF_MASTER;
3585 }
3586
3587 /* Embedded bridge, macvlan, and any other device support */
3588 if (ndm->ndm_flags & NTF_SELF) {
3589 if (dev->netdev_ops->ndo_fdb_del)
3590 err = dev->netdev_ops->ndo_fdb_del(ndm, tb, dev, addr,
3591 vid);
3592 else
3593 err = ndo_dflt_fdb_del(ndm, tb, dev, addr, vid);
3594
3595 if (!err) {
3596 rtnl_fdb_notify(dev, addr, vid, RTM_DELNEIGH,
3597 ndm->ndm_state);
3598 ndm->ndm_flags &= ~NTF_SELF;
3599 }
3600 }
3601out:
3602 return err;
3603}
3604
3605static int nlmsg_populate_fdb(struct sk_buff *skb,
3606 struct netlink_callback *cb,
3607 struct net_device *dev,
3608 int *idx,
3609 struct netdev_hw_addr_list *list)
3610{
3611 struct netdev_hw_addr *ha;
3612 int err;
3613 u32 portid, seq;
3614
3615 portid = NETLINK_CB(cb->skb).portid;
3616 seq = cb->nlh->nlmsg_seq;
3617
3618 list_for_each_entry(ha, &list->list, list) {
3619 if (*idx < cb->args[2])
3620 goto skip;
3621
3622 err = nlmsg_populate_fdb_fill(skb, dev, ha->addr, 0,
3623 portid, seq,
3624 RTM_NEWNEIGH, NTF_SELF,
3625 NLM_F_MULTI, NUD_PERMANENT);
3626 if (err < 0)
3627 return err;
3628skip:
3629 *idx += 1;
3630 }
3631 return 0;
3632}
3633
3634/**
3635 * ndo_dflt_fdb_dump - default netdevice operation to dump an FDB table.
3636 * @nlh: netlink message header
3637 * @dev: netdevice
3638 *
3639 * Default netdevice operation to dump the existing unicast address list.
3640 * Returns number of addresses from list put in skb.
3641 */
3642int ndo_dflt_fdb_dump(struct sk_buff *skb,
3643 struct netlink_callback *cb,
3644 struct net_device *dev,
3645 struct net_device *filter_dev,
3646 int *idx)
3647{
3648 int err;
3649
3650 netif_addr_lock_bh(dev);
3651 err = nlmsg_populate_fdb(skb, cb, dev, idx, &dev->uc);
3652 if (err)
3653 goto out;
3654 err = nlmsg_populate_fdb(skb, cb, dev, idx, &dev->mc);
3655out:
3656 netif_addr_unlock_bh(dev);
3657 return err;
3658}
3659EXPORT_SYMBOL(ndo_dflt_fdb_dump);
3660
3661static int rtnl_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb)
3662{
3663 struct net_device *dev;
3664 struct nlattr *tb[IFLA_MAX+1];
3665 struct net_device *br_dev = NULL;
3666 const struct net_device_ops *ops = NULL;
3667 const struct net_device_ops *cops = NULL;
3668 struct ifinfomsg *ifm = nlmsg_data(cb->nlh);
3669 struct net *net = sock_net(skb->sk);
3670 struct hlist_head *head;
3671 int brport_idx = 0;
3672 int br_idx = 0;
3673 int h, s_h;
3674 int idx = 0, s_idx;
3675 int err = 0;
3676 int fidx = 0;
3677
3678 err = nlmsg_parse(cb->nlh, sizeof(struct ifinfomsg), tb,
3679 IFLA_MAX, ifla_policy, NULL);
3680 if (err < 0) {
3681 return -EINVAL;
3682 } else if (err == 0) {
3683 if (tb[IFLA_MASTER])
3684 br_idx = nla_get_u32(tb[IFLA_MASTER]);
3685 }
3686
3687 brport_idx = ifm->ifi_index;
3688
3689 if (br_idx) {
3690 br_dev = __dev_get_by_index(net, br_idx);
3691 if (!br_dev)
3692 return -ENODEV;
3693
3694 ops = br_dev->netdev_ops;
3695 }
3696
3697 s_h = cb->args[0];
3698 s_idx = cb->args[1];
3699
3700 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3701 idx = 0;
3702 head = &net->dev_index_head[h];
3703 hlist_for_each_entry(dev, head, index_hlist) {
3704
3705 if (brport_idx && (dev->ifindex != brport_idx))
3706 continue;
3707
3708 if (!br_idx) { /* user did not specify a specific bridge */
3709 if (dev->priv_flags & IFF_BRIDGE_PORT) {
3710 br_dev = netdev_master_upper_dev_get(dev);
3711 cops = br_dev->netdev_ops;
3712 }
3713 } else {
3714 if (dev != br_dev &&
3715 !(dev->priv_flags & IFF_BRIDGE_PORT))
3716 continue;
3717
3718 if (br_dev != netdev_master_upper_dev_get(dev) &&
3719 !(dev->priv_flags & IFF_EBRIDGE))
3720 continue;
3721 cops = ops;
3722 }
3723
3724 if (idx < s_idx)
3725 goto cont;
3726
3727 if (dev->priv_flags & IFF_BRIDGE_PORT) {
3728 if (cops && cops->ndo_fdb_dump) {
3729 err = cops->ndo_fdb_dump(skb, cb,
3730 br_dev, dev,
3731 &fidx);
3732 if (err == -EMSGSIZE)
3733 goto out;
3734 }
3735 }
3736
3737 if (dev->netdev_ops->ndo_fdb_dump)
3738 err = dev->netdev_ops->ndo_fdb_dump(skb, cb,
3739 dev, NULL,
3740 &fidx);
3741 else
3742 err = ndo_dflt_fdb_dump(skb, cb, dev, NULL,
3743 &fidx);
3744 if (err == -EMSGSIZE)
3745 goto out;
3746
3747 cops = NULL;
3748
3749 /* reset fdb offset to 0 for rest of the interfaces */
3750 cb->args[2] = 0;
3751 fidx = 0;
3752cont:
3753 idx++;
3754 }
3755 }
3756
3757out:
3758 cb->args[0] = h;
3759 cb->args[1] = idx;
3760 cb->args[2] = fidx;
3761
3762 return skb->len;
3763}
3764
3765static int brport_nla_put_flag(struct sk_buff *skb, u32 flags, u32 mask,
3766 unsigned int attrnum, unsigned int flag)
3767{
3768 if (mask & flag)
3769 return nla_put_u8(skb, attrnum, !!(flags & flag));
3770 return 0;
3771}
3772
3773int ndo_dflt_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq,
3774 struct net_device *dev, u16 mode,
3775 u32 flags, u32 mask, int nlflags,
3776 u32 filter_mask,
3777 int (*vlan_fill)(struct sk_buff *skb,
3778 struct net_device *dev,
3779 u32 filter_mask))
3780{
3781 struct nlmsghdr *nlh;
3782 struct ifinfomsg *ifm;
3783 struct nlattr *br_afspec;
3784 struct nlattr *protinfo;
3785 u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN;
3786 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
3787 int err = 0;
3788
3789 nlh = nlmsg_put(skb, pid, seq, RTM_NEWLINK, sizeof(*ifm), nlflags);
3790 if (nlh == NULL)
3791 return -EMSGSIZE;
3792
3793 ifm = nlmsg_data(nlh);
3794 ifm->ifi_family = AF_BRIDGE;
3795 ifm->__ifi_pad = 0;
3796 ifm->ifi_type = dev->type;
3797 ifm->ifi_index = dev->ifindex;
3798 ifm->ifi_flags = dev_get_flags(dev);
3799 ifm->ifi_change = 0;
3800
3801
3802 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
3803 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
3804 nla_put_u8(skb, IFLA_OPERSTATE, operstate) ||
3805 (br_dev &&
3806 nla_put_u32(skb, IFLA_MASTER, br_dev->ifindex)) ||
3807 (dev->addr_len &&
3808 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
3809 (dev->ifindex != dev_get_iflink(dev) &&
3810 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))))
3811 goto nla_put_failure;
3812
3813 br_afspec = nla_nest_start(skb, IFLA_AF_SPEC);
3814 if (!br_afspec)
3815 goto nla_put_failure;
3816
3817 if (nla_put_u16(skb, IFLA_BRIDGE_FLAGS, BRIDGE_FLAGS_SELF)) {
3818 nla_nest_cancel(skb, br_afspec);
3819 goto nla_put_failure;
3820 }
3821
3822 if (mode != BRIDGE_MODE_UNDEF) {
3823 if (nla_put_u16(skb, IFLA_BRIDGE_MODE, mode)) {
3824 nla_nest_cancel(skb, br_afspec);
3825 goto nla_put_failure;
3826 }
3827 }
3828 if (vlan_fill) {
3829 err = vlan_fill(skb, dev, filter_mask);
3830 if (err) {
3831 nla_nest_cancel(skb, br_afspec);
3832 goto nla_put_failure;
3833 }
3834 }
3835 nla_nest_end(skb, br_afspec);
3836
3837 protinfo = nla_nest_start(skb, IFLA_PROTINFO | NLA_F_NESTED);
3838 if (!protinfo)
3839 goto nla_put_failure;
3840
3841 if (brport_nla_put_flag(skb, flags, mask,
3842 IFLA_BRPORT_MODE, BR_HAIRPIN_MODE) ||
3843 brport_nla_put_flag(skb, flags, mask,
3844 IFLA_BRPORT_GUARD, BR_BPDU_GUARD) ||
3845 brport_nla_put_flag(skb, flags, mask,
3846 IFLA_BRPORT_FAST_LEAVE,
3847 BR_MULTICAST_FAST_LEAVE) ||
3848 brport_nla_put_flag(skb, flags, mask,
3849 IFLA_BRPORT_PROTECT, BR_ROOT_BLOCK) ||
3850 brport_nla_put_flag(skb, flags, mask,
3851 IFLA_BRPORT_LEARNING, BR_LEARNING) ||
3852 brport_nla_put_flag(skb, flags, mask,
3853 IFLA_BRPORT_LEARNING_SYNC, BR_LEARNING_SYNC) ||
3854 brport_nla_put_flag(skb, flags, mask,
3855 IFLA_BRPORT_UNICAST_FLOOD, BR_FLOOD) ||
3856 brport_nla_put_flag(skb, flags, mask,
3857 IFLA_BRPORT_PROXYARP, BR_PROXYARP)) {
3858 nla_nest_cancel(skb, protinfo);
3859 goto nla_put_failure;
3860 }
3861
3862 nla_nest_end(skb, protinfo);
3863
3864 nlmsg_end(skb, nlh);
3865 return 0;
3866nla_put_failure:
3867 nlmsg_cancel(skb, nlh);
3868 return err ? err : -EMSGSIZE;
3869}
3870EXPORT_SYMBOL_GPL(ndo_dflt_bridge_getlink);
3871
3872static int rtnl_bridge_getlink(struct sk_buff *skb, struct netlink_callback *cb)
3873{
3874 struct net *net = sock_net(skb->sk);
3875 struct net_device *dev;
3876 int idx = 0;
3877 u32 portid = NETLINK_CB(cb->skb).portid;
3878 u32 seq = cb->nlh->nlmsg_seq;
3879 u32 filter_mask = 0;
3880 int err;
3881
3882 if (nlmsg_len(cb->nlh) > sizeof(struct ifinfomsg)) {
3883 struct nlattr *extfilt;
3884
3885 extfilt = nlmsg_find_attr(cb->nlh, sizeof(struct ifinfomsg),
3886 IFLA_EXT_MASK);
3887 if (extfilt) {
3888 if (nla_len(extfilt) < sizeof(filter_mask))
3889 return -EINVAL;
3890
3891 filter_mask = nla_get_u32(extfilt);
3892 }
3893 }
3894
3895 rcu_read_lock();
3896 for_each_netdev_rcu(net, dev) {
3897 const struct net_device_ops *ops = dev->netdev_ops;
3898 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
3899
3900 if (br_dev && br_dev->netdev_ops->ndo_bridge_getlink) {
3901 if (idx >= cb->args[0]) {
3902 err = br_dev->netdev_ops->ndo_bridge_getlink(
3903 skb, portid, seq, dev,
3904 filter_mask, NLM_F_MULTI);
3905 if (err < 0 && err != -EOPNOTSUPP) {
3906 if (likely(skb->len))
3907 break;
3908
3909 goto out_err;
3910 }
3911 }
3912 idx++;
3913 }
3914
3915 if (ops->ndo_bridge_getlink) {
3916 if (idx >= cb->args[0]) {
3917 err = ops->ndo_bridge_getlink(skb, portid,
3918 seq, dev,
3919 filter_mask,
3920 NLM_F_MULTI);
3921 if (err < 0 && err != -EOPNOTSUPP) {
3922 if (likely(skb->len))
3923 break;
3924
3925 goto out_err;
3926 }
3927 }
3928 idx++;
3929 }
3930 }
3931 err = skb->len;
3932out_err:
3933 rcu_read_unlock();
3934 cb->args[0] = idx;
3935
3936 return err;
3937}
3938
3939static inline size_t bridge_nlmsg_size(void)
3940{
3941 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3942 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3943 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3944 + nla_total_size(sizeof(u32)) /* IFLA_MASTER */
3945 + nla_total_size(sizeof(u32)) /* IFLA_MTU */
3946 + nla_total_size(sizeof(u32)) /* IFLA_LINK */
3947 + nla_total_size(sizeof(u32)) /* IFLA_OPERSTATE */
3948 + nla_total_size(sizeof(u8)) /* IFLA_PROTINFO */
3949 + nla_total_size(sizeof(struct nlattr)) /* IFLA_AF_SPEC */
3950 + nla_total_size(sizeof(u16)) /* IFLA_BRIDGE_FLAGS */
3951 + nla_total_size(sizeof(u16)); /* IFLA_BRIDGE_MODE */
3952}
3953
3954static int rtnl_bridge_notify(struct net_device *dev)
3955{
3956 struct net *net = dev_net(dev);
3957 struct sk_buff *skb;
3958 int err = -EOPNOTSUPP;
3959
3960 if (!dev->netdev_ops->ndo_bridge_getlink)
3961 return 0;
3962
3963 skb = nlmsg_new(bridge_nlmsg_size(), GFP_ATOMIC);
3964 if (!skb) {
3965 err = -ENOMEM;
3966 goto errout;
3967 }
3968
3969 err = dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0, 0);
3970 if (err < 0)
3971 goto errout;
3972
3973 if (!skb->len)
3974 goto errout;
3975
3976 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
3977 return 0;
3978errout:
3979 WARN_ON(err == -EMSGSIZE);
3980 kfree_skb(skb);
3981 if (err)
3982 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
3983 return err;
3984}
3985
3986static int rtnl_bridge_setlink(struct sk_buff *skb, struct nlmsghdr *nlh,
3987 struct netlink_ext_ack *extack)
3988{
3989 struct net *net = sock_net(skb->sk);
3990 struct ifinfomsg *ifm;
3991 struct net_device *dev;
3992 struct nlattr *br_spec, *attr = NULL;
3993 int rem, err = -EOPNOTSUPP;
3994 u16 flags = 0;
3995 bool have_flags = false;
3996
3997 if (nlmsg_len(nlh) < sizeof(*ifm))
3998 return -EINVAL;
3999
4000 ifm = nlmsg_data(nlh);
4001 if (ifm->ifi_family != AF_BRIDGE)
4002 return -EPFNOSUPPORT;
4003
4004 dev = __dev_get_by_index(net, ifm->ifi_index);
4005 if (!dev) {
4006 NL_SET_ERR_MSG(extack, "unknown ifindex");
4007 return -ENODEV;
4008 }
4009
4010 br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
4011 if (br_spec) {
4012 nla_for_each_nested(attr, br_spec, rem) {
4013 if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
4014 if (nla_len(attr) < sizeof(flags))
4015 return -EINVAL;
4016
4017 have_flags = true;
4018 flags = nla_get_u16(attr);
4019 break;
4020 }
4021 }
4022 }
4023
4024 if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
4025 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
4026
4027 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_setlink) {
4028 err = -EOPNOTSUPP;
4029 goto out;
4030 }
4031
4032 err = br_dev->netdev_ops->ndo_bridge_setlink(dev, nlh, flags);
4033 if (err)
4034 goto out;
4035
4036 flags &= ~BRIDGE_FLAGS_MASTER;
4037 }
4038
4039 if ((flags & BRIDGE_FLAGS_SELF)) {
4040 if (!dev->netdev_ops->ndo_bridge_setlink)
4041 err = -EOPNOTSUPP;
4042 else
4043 err = dev->netdev_ops->ndo_bridge_setlink(dev, nlh,
4044 flags);
4045 if (!err) {
4046 flags &= ~BRIDGE_FLAGS_SELF;
4047
4048 /* Generate event to notify upper layer of bridge
4049 * change
4050 */
4051 err = rtnl_bridge_notify(dev);
4052 }
4053 }
4054
4055 if (have_flags)
4056 memcpy(nla_data(attr), &flags, sizeof(flags));
4057out:
4058 return err;
4059}
4060
4061static int rtnl_bridge_dellink(struct sk_buff *skb, struct nlmsghdr *nlh,
4062 struct netlink_ext_ack *extack)
4063{
4064 struct net *net = sock_net(skb->sk);
4065 struct ifinfomsg *ifm;
4066 struct net_device *dev;
4067 struct nlattr *br_spec, *attr = NULL;
4068 int rem, err = -EOPNOTSUPP;
4069 u16 flags = 0;
4070 bool have_flags = false;
4071
4072 if (nlmsg_len(nlh) < sizeof(*ifm))
4073 return -EINVAL;
4074
4075 ifm = nlmsg_data(nlh);
4076 if (ifm->ifi_family != AF_BRIDGE)
4077 return -EPFNOSUPPORT;
4078
4079 dev = __dev_get_by_index(net, ifm->ifi_index);
4080 if (!dev) {
4081 NL_SET_ERR_MSG(extack, "unknown ifindex");
4082 return -ENODEV;
4083 }
4084
4085 br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
4086 if (br_spec) {
4087 nla_for_each_nested(attr, br_spec, rem) {
4088 if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
4089 if (nla_len(attr) < sizeof(flags))
4090 return -EINVAL;
4091
4092 have_flags = true;
4093 flags = nla_get_u16(attr);
4094 break;
4095 }
4096 }
4097 }
4098
4099 if (!flags || (flags & BRIDGE_FLAGS_MASTER)) {
4100 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
4101
4102 if (!br_dev || !br_dev->netdev_ops->ndo_bridge_dellink) {
4103 err = -EOPNOTSUPP;
4104 goto out;
4105 }
4106
4107 err = br_dev->netdev_ops->ndo_bridge_dellink(dev, nlh, flags);
4108 if (err)
4109 goto out;
4110
4111 flags &= ~BRIDGE_FLAGS_MASTER;
4112 }
4113
4114 if ((flags & BRIDGE_FLAGS_SELF)) {
4115 if (!dev->netdev_ops->ndo_bridge_dellink)
4116 err = -EOPNOTSUPP;
4117 else
4118 err = dev->netdev_ops->ndo_bridge_dellink(dev, nlh,
4119 flags);
4120
4121 if (!err) {
4122 flags &= ~BRIDGE_FLAGS_SELF;
4123
4124 /* Generate event to notify upper layer of bridge
4125 * change
4126 */
4127 err = rtnl_bridge_notify(dev);
4128 }
4129 }
4130
4131 if (have_flags)
4132 memcpy(nla_data(attr), &flags, sizeof(flags));
4133out:
4134 return err;
4135}
4136
4137static bool stats_attr_valid(unsigned int mask, int attrid, int idxattr)
4138{
4139 return (mask & IFLA_STATS_FILTER_BIT(attrid)) &&
4140 (!idxattr || idxattr == attrid);
4141}
4142
4143#define IFLA_OFFLOAD_XSTATS_FIRST (IFLA_OFFLOAD_XSTATS_UNSPEC + 1)
4144static int rtnl_get_offload_stats_attr_size(int attr_id)
4145{
4146 switch (attr_id) {
4147 case IFLA_OFFLOAD_XSTATS_CPU_HIT:
4148 return sizeof(struct rtnl_link_stats64);
4149 }
4150
4151 return 0;
4152}
4153
4154static int rtnl_get_offload_stats(struct sk_buff *skb, struct net_device *dev,
4155 int *prividx)
4156{
4157 struct nlattr *attr = NULL;
4158 int attr_id, size;
4159 void *attr_data;
4160 int err;
4161
4162 if (!(dev->netdev_ops && dev->netdev_ops->ndo_has_offload_stats &&
4163 dev->netdev_ops->ndo_get_offload_stats))
4164 return -ENODATA;
4165
4166 for (attr_id = IFLA_OFFLOAD_XSTATS_FIRST;
4167 attr_id <= IFLA_OFFLOAD_XSTATS_MAX; attr_id++) {
4168 if (attr_id < *prividx)
4169 continue;
4170
4171 size = rtnl_get_offload_stats_attr_size(attr_id);
4172 if (!size)
4173 continue;
4174
4175 if (!dev->netdev_ops->ndo_has_offload_stats(dev, attr_id))
4176 continue;
4177
4178 attr = nla_reserve_64bit(skb, attr_id, size,
4179 IFLA_OFFLOAD_XSTATS_UNSPEC);
4180 if (!attr)
4181 goto nla_put_failure;
4182
4183 attr_data = nla_data(attr);
4184 memset(attr_data, 0, size);
4185 err = dev->netdev_ops->ndo_get_offload_stats(attr_id, dev,
4186 attr_data);
4187 if (err)
4188 goto get_offload_stats_failure;
4189 }
4190
4191 if (!attr)
4192 return -ENODATA;
4193
4194 *prividx = 0;
4195 return 0;
4196
4197nla_put_failure:
4198 err = -EMSGSIZE;
4199get_offload_stats_failure:
4200 *prividx = attr_id;
4201 return err;
4202}
4203
4204static int rtnl_get_offload_stats_size(const struct net_device *dev)
4205{
4206 int nla_size = 0;
4207 int attr_id;
4208 int size;
4209
4210 if (!(dev->netdev_ops && dev->netdev_ops->ndo_has_offload_stats &&
4211 dev->netdev_ops->ndo_get_offload_stats))
4212 return 0;
4213
4214 for (attr_id = IFLA_OFFLOAD_XSTATS_FIRST;
4215 attr_id <= IFLA_OFFLOAD_XSTATS_MAX; attr_id++) {
4216 if (!dev->netdev_ops->ndo_has_offload_stats(dev, attr_id))
4217 continue;
4218 size = rtnl_get_offload_stats_attr_size(attr_id);
4219 nla_size += nla_total_size_64bit(size);
4220 }
4221
4222 if (nla_size != 0)
4223 nla_size += nla_total_size(0);
4224
4225 return nla_size;
4226}
4227
4228static int rtnl_fill_statsinfo(struct sk_buff *skb, struct net_device *dev,
4229 int type, u32 pid, u32 seq, u32 change,
4230 unsigned int flags, unsigned int filter_mask,
4231 int *idxattr, int *prividx)
4232{
4233 struct if_stats_msg *ifsm;
4234 struct nlmsghdr *nlh;
4235 struct nlattr *attr;
4236 int s_prividx = *prividx;
4237 int err;
4238
4239 ASSERT_RTNL();
4240
4241 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifsm), flags);
4242 if (!nlh)
4243 return -EMSGSIZE;
4244
4245 ifsm = nlmsg_data(nlh);
4246 ifsm->family = PF_UNSPEC;
4247 ifsm->pad1 = 0;
4248 ifsm->pad2 = 0;
4249 ifsm->ifindex = dev->ifindex;
4250 ifsm->filter_mask = filter_mask;
4251
4252 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_64, *idxattr)) {
4253 struct rtnl_link_stats64 *sp;
4254
4255 attr = nla_reserve_64bit(skb, IFLA_STATS_LINK_64,
4256 sizeof(struct rtnl_link_stats64),
4257 IFLA_STATS_UNSPEC);
4258 if (!attr)
4259 goto nla_put_failure;
4260
4261 sp = nla_data(attr);
4262 dev_get_stats(dev, sp);
4263 }
4264
4265 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS, *idxattr)) {
4266 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
4267
4268 if (ops && ops->fill_linkxstats) {
4269 *idxattr = IFLA_STATS_LINK_XSTATS;
4270 attr = nla_nest_start(skb,
4271 IFLA_STATS_LINK_XSTATS);
4272 if (!attr)
4273 goto nla_put_failure;
4274
4275 err = ops->fill_linkxstats(skb, dev, prividx, *idxattr);
4276 nla_nest_end(skb, attr);
4277 if (err)
4278 goto nla_put_failure;
4279 *idxattr = 0;
4280 }
4281 }
4282
4283 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS_SLAVE,
4284 *idxattr)) {
4285 const struct rtnl_link_ops *ops = NULL;
4286 const struct net_device *master;
4287
4288 master = netdev_master_upper_dev_get(dev);
4289 if (master)
4290 ops = master->rtnl_link_ops;
4291 if (ops && ops->fill_linkxstats) {
4292 *idxattr = IFLA_STATS_LINK_XSTATS_SLAVE;
4293 attr = nla_nest_start(skb,
4294 IFLA_STATS_LINK_XSTATS_SLAVE);
4295 if (!attr)
4296 goto nla_put_failure;
4297
4298 err = ops->fill_linkxstats(skb, dev, prividx, *idxattr);
4299 nla_nest_end(skb, attr);
4300 if (err)
4301 goto nla_put_failure;
4302 *idxattr = 0;
4303 }
4304 }
4305
4306 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_OFFLOAD_XSTATS,
4307 *idxattr)) {
4308 *idxattr = IFLA_STATS_LINK_OFFLOAD_XSTATS;
4309 attr = nla_nest_start(skb, IFLA_STATS_LINK_OFFLOAD_XSTATS);
4310 if (!attr)
4311 goto nla_put_failure;
4312
4313 err = rtnl_get_offload_stats(skb, dev, prividx);
4314 if (err == -ENODATA)
4315 nla_nest_cancel(skb, attr);
4316 else
4317 nla_nest_end(skb, attr);
4318
4319 if (err && err != -ENODATA)
4320 goto nla_put_failure;
4321 *idxattr = 0;
4322 }
4323
4324 if (stats_attr_valid(filter_mask, IFLA_STATS_AF_SPEC, *idxattr)) {
4325 struct rtnl_af_ops *af_ops;
4326
4327 *idxattr = IFLA_STATS_AF_SPEC;
4328 attr = nla_nest_start(skb, IFLA_STATS_AF_SPEC);
4329 if (!attr)
4330 goto nla_put_failure;
4331
4332 rcu_read_lock();
4333 list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) {
4334 if (af_ops->fill_stats_af) {
4335 struct nlattr *af;
4336 int err;
4337
4338 af = nla_nest_start(skb, af_ops->family);
4339 if (!af) {
4340 rcu_read_unlock();
4341 goto nla_put_failure;
4342 }
4343 err = af_ops->fill_stats_af(skb, dev);
4344
4345 if (err == -ENODATA) {
4346 nla_nest_cancel(skb, af);
4347 } else if (err < 0) {
4348 rcu_read_unlock();
4349 goto nla_put_failure;
4350 }
4351
4352 nla_nest_end(skb, af);
4353 }
4354 }
4355 rcu_read_unlock();
4356
4357 nla_nest_end(skb, attr);
4358
4359 *idxattr = 0;
4360 }
4361
4362 nlmsg_end(skb, nlh);
4363
4364 return 0;
4365
4366nla_put_failure:
4367 /* not a multi message or no progress mean a real error */
4368 if (!(flags & NLM_F_MULTI) || s_prividx == *prividx)
4369 nlmsg_cancel(skb, nlh);
4370 else
4371 nlmsg_end(skb, nlh);
4372
4373 return -EMSGSIZE;
4374}
4375
4376static size_t if_nlmsg_stats_size(const struct net_device *dev,
4377 u32 filter_mask)
4378{
4379 size_t size = 0;
4380
4381 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_64, 0))
4382 size += nla_total_size_64bit(sizeof(struct rtnl_link_stats64));
4383
4384 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS, 0)) {
4385 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
4386 int attr = IFLA_STATS_LINK_XSTATS;
4387
4388 if (ops && ops->get_linkxstats_size) {
4389 size += nla_total_size(ops->get_linkxstats_size(dev,
4390 attr));
4391 /* for IFLA_STATS_LINK_XSTATS */
4392 size += nla_total_size(0);
4393 }
4394 }
4395
4396 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS_SLAVE, 0)) {
4397 struct net_device *_dev = (struct net_device *)dev;
4398 const struct rtnl_link_ops *ops = NULL;
4399 const struct net_device *master;
4400
4401 /* netdev_master_upper_dev_get can't take const */
4402 master = netdev_master_upper_dev_get(_dev);
4403 if (master)
4404 ops = master->rtnl_link_ops;
4405 if (ops && ops->get_linkxstats_size) {
4406 int attr = IFLA_STATS_LINK_XSTATS_SLAVE;
4407
4408 size += nla_total_size(ops->get_linkxstats_size(dev,
4409 attr));
4410 /* for IFLA_STATS_LINK_XSTATS_SLAVE */
4411 size += nla_total_size(0);
4412 }
4413 }
4414
4415 if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_OFFLOAD_XSTATS, 0))
4416 size += rtnl_get_offload_stats_size(dev);
4417
4418 if (stats_attr_valid(filter_mask, IFLA_STATS_AF_SPEC, 0)) {
4419 struct rtnl_af_ops *af_ops;
4420
4421 /* for IFLA_STATS_AF_SPEC */
4422 size += nla_total_size(0);
4423
4424 rcu_read_lock();
4425 list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) {
4426 if (af_ops->get_stats_af_size) {
4427 size += nla_total_size(
4428 af_ops->get_stats_af_size(dev));
4429
4430 /* for AF_* */
4431 size += nla_total_size(0);
4432 }
4433 }
4434 rcu_read_unlock();
4435 }
4436
4437 return size;
4438}
4439
4440static int rtnl_stats_get(struct sk_buff *skb, struct nlmsghdr *nlh,
4441 struct netlink_ext_ack *extack)
4442{
4443 struct net *net = sock_net(skb->sk);
4444 struct net_device *dev = NULL;
4445 int idxattr = 0, prividx = 0;
4446 struct if_stats_msg *ifsm;
4447 struct sk_buff *nskb;
4448 u32 filter_mask;
4449 int err;
4450
4451 if (nlmsg_len(nlh) < sizeof(*ifsm))
4452 return -EINVAL;
4453
4454 ifsm = nlmsg_data(nlh);
4455 if (ifsm->ifindex > 0)
4456 dev = __dev_get_by_index(net, ifsm->ifindex);
4457 else
4458 return -EINVAL;
4459
4460 if (!dev)
4461 return -ENODEV;
4462
4463 filter_mask = ifsm->filter_mask;
4464 if (!filter_mask)
4465 return -EINVAL;
4466
4467 nskb = nlmsg_new(if_nlmsg_stats_size(dev, filter_mask), GFP_KERNEL);
4468 if (!nskb)
4469 return -ENOBUFS;
4470
4471 err = rtnl_fill_statsinfo(nskb, dev, RTM_NEWSTATS,
4472 NETLINK_CB(skb).portid, nlh->nlmsg_seq, 0,
4473 0, filter_mask, &idxattr, &prividx);
4474 if (err < 0) {
4475 /* -EMSGSIZE implies BUG in if_nlmsg_stats_size */
4476 WARN_ON(err == -EMSGSIZE);
4477 kfree_skb(nskb);
4478 } else {
4479 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).portid);
4480 }
4481
4482 return err;
4483}
4484
4485static int rtnl_stats_dump(struct sk_buff *skb, struct netlink_callback *cb)
4486{
4487 int h, s_h, err, s_idx, s_idxattr, s_prividx;
4488 struct net *net = sock_net(skb->sk);
4489 unsigned int flags = NLM_F_MULTI;
4490 struct if_stats_msg *ifsm;
4491 struct hlist_head *head;
4492 struct net_device *dev;
4493 u32 filter_mask = 0;
4494 int idx = 0;
4495
4496 s_h = cb->args[0];
4497 s_idx = cb->args[1];
4498 s_idxattr = cb->args[2];
4499 s_prividx = cb->args[3];
4500
4501 cb->seq = net->dev_base_seq;
4502
4503 if (nlmsg_len(cb->nlh) < sizeof(*ifsm))
4504 return -EINVAL;
4505
4506 ifsm = nlmsg_data(cb->nlh);
4507 filter_mask = ifsm->filter_mask;
4508 if (!filter_mask)
4509 return -EINVAL;
4510
4511 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4512 idx = 0;
4513 head = &net->dev_index_head[h];
4514 hlist_for_each_entry(dev, head, index_hlist) {
4515 if (idx < s_idx)
4516 goto cont;
4517 err = rtnl_fill_statsinfo(skb, dev, RTM_NEWSTATS,
4518 NETLINK_CB(cb->skb).portid,
4519 cb->nlh->nlmsg_seq, 0,
4520 flags, filter_mask,
4521 &s_idxattr, &s_prividx);
4522 /* If we ran out of room on the first message,
4523 * we're in trouble
4524 */
4525 WARN_ON((err == -EMSGSIZE) && (skb->len == 0));
4526
4527 if (err < 0)
4528 goto out;
4529 s_prividx = 0;
4530 s_idxattr = 0;
4531 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4532cont:
4533 idx++;
4534 }
4535 }
4536out:
4537 cb->args[3] = s_prividx;
4538 cb->args[2] = s_idxattr;
4539 cb->args[1] = idx;
4540 cb->args[0] = h;
4541
4542 return skb->len;
4543}
4544
4545/* Process one rtnetlink message. */
4546
4547static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
4548 struct netlink_ext_ack *extack)
4549{
4550 struct net *net = sock_net(skb->sk);
4551 struct rtnl_link *link;
4552 struct module *owner;
4553 int err = -EOPNOTSUPP;
4554 rtnl_doit_func doit;
4555 unsigned int flags;
4556 int kind;
4557 int family;
4558 int type;
4559
4560 type = nlh->nlmsg_type;
4561 if (type > RTM_MAX)
4562 return -EOPNOTSUPP;
4563
4564 type -= RTM_BASE;
4565
4566 /* All the messages must have at least 1 byte length */
4567 if (nlmsg_len(nlh) < sizeof(struct rtgenmsg))
4568 return 0;
4569
4570 family = ((struct rtgenmsg *)nlmsg_data(nlh))->rtgen_family;
4571 kind = type&3;
4572
4573 if (kind != 2 && !netlink_net_capable(skb, CAP_NET_ADMIN))
4574 return -EPERM;
4575
4576 rcu_read_lock();
4577 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
4578 struct sock *rtnl;
4579 rtnl_dumpit_func dumpit;
4580 u16 min_dump_alloc = 0;
4581
4582 link = rtnl_get_link(family, type);
4583 if (!link || !link->dumpit) {
4584 family = PF_UNSPEC;
4585 link = rtnl_get_link(family, type);
4586 if (!link || !link->dumpit)
4587 goto err_unlock;
4588 }
4589 owner = link->owner;
4590 dumpit = link->dumpit;
4591
4592 if (type == RTM_GETLINK - RTM_BASE)
4593 min_dump_alloc = rtnl_calcit(skb, nlh);
4594
4595 err = 0;
4596 /* need to do this before rcu_read_unlock() */
4597 if (!try_module_get(owner))
4598 err = -EPROTONOSUPPORT;
4599
4600 rcu_read_unlock();
4601
4602 rtnl = net->rtnl;
4603 if (err == 0) {
4604 struct netlink_dump_control c = {
4605 .dump = dumpit,
4606 .min_dump_alloc = min_dump_alloc,
4607 .module = owner,
4608 };
4609 err = netlink_dump_start(rtnl, skb, nlh, &c);
4610 /* netlink_dump_start() will keep a reference on
4611 * module if dump is still in progress.
4612 */
4613 module_put(owner);
4614 }
4615 return err;
4616 }
4617
4618 link = rtnl_get_link(family, type);
4619 if (!link || !link->doit) {
4620 family = PF_UNSPEC;
4621 link = rtnl_get_link(PF_UNSPEC, type);
4622 if (!link || !link->doit)
4623 goto out_unlock;
4624 }
4625
4626 owner = link->owner;
4627 if (!try_module_get(owner)) {
4628 err = -EPROTONOSUPPORT;
4629 goto out_unlock;
4630 }
4631
4632 flags = link->flags;
4633 if (flags & RTNL_FLAG_DOIT_UNLOCKED) {
4634 doit = link->doit;
4635 rcu_read_unlock();
4636 if (doit)
4637 err = doit(skb, nlh, extack);
4638 module_put(owner);
4639 return err;
4640 }
4641 rcu_read_unlock();
4642
4643 rtnl_lock();
4644 link = rtnl_get_link(family, type);
4645 if (link && link->doit)
4646 err = link->doit(skb, nlh, extack);
4647 rtnl_unlock();
4648
4649 module_put(owner);
4650
4651 return err;
4652
4653out_unlock:
4654 rcu_read_unlock();
4655 return err;
4656
4657err_unlock:
4658 rcu_read_unlock();
4659 return -EOPNOTSUPP;
4660}
4661
4662static void rtnetlink_rcv(struct sk_buff *skb)
4663{
4664 netlink_rcv_skb(skb, &rtnetlink_rcv_msg);
4665}
4666
4667static int rtnetlink_bind(struct net *net, int group)
4668{
4669 switch (group) {
4670 case RTNLGRP_IPV4_MROUTE_R:
4671 case RTNLGRP_IPV6_MROUTE_R:
4672 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
4673 return -EPERM;
4674 break;
4675 }
4676 return 0;
4677}
4678
4679static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
4680{
4681 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
4682
4683 switch (event) {
4684 case NETDEV_REBOOT:
4685 case NETDEV_CHANGEMTU:
4686 case NETDEV_CHANGEADDR:
4687 case NETDEV_CHANGENAME:
4688 case NETDEV_FEAT_CHANGE:
4689 case NETDEV_BONDING_FAILOVER:
4690 case NETDEV_POST_TYPE_CHANGE:
4691 case NETDEV_NOTIFY_PEERS:
4692 case NETDEV_CHANGEUPPER:
4693 case NETDEV_RESEND_IGMP:
4694 case NETDEV_CHANGEINFODATA:
4695 case NETDEV_CHANGELOWERSTATE:
4696 case NETDEV_CHANGE_TX_QUEUE_LEN:
4697 rtmsg_ifinfo_event(RTM_NEWLINK, dev, 0, rtnl_get_event(event),
4698 GFP_KERNEL, NULL, 0);
4699 break;
4700 default:
4701 break;
4702 }
4703 return NOTIFY_DONE;
4704}
4705
4706static struct notifier_block rtnetlink_dev_notifier = {
4707 .notifier_call = rtnetlink_event,
4708};
4709
4710
4711static int __net_init rtnetlink_net_init(struct net *net)
4712{
4713 struct sock *sk;
4714 struct netlink_kernel_cfg cfg = {
4715 .groups = RTNLGRP_MAX,
4716 .input = rtnetlink_rcv,
4717 .cb_mutex = &rtnl_mutex,
4718 .flags = NL_CFG_F_NONROOT_RECV,
4719 .bind = rtnetlink_bind,
4720 };
4721
4722 sk = netlink_kernel_create(net, NETLINK_ROUTE, &cfg);
4723 if (!sk)
4724 return -ENOMEM;
4725 net->rtnl = sk;
4726 return 0;
4727}
4728
4729static void __net_exit rtnetlink_net_exit(struct net *net)
4730{
4731 netlink_kernel_release(net->rtnl);
4732 net->rtnl = NULL;
4733}
4734
4735static struct pernet_operations rtnetlink_net_ops = {
4736 .init = rtnetlink_net_init,
4737 .exit = rtnetlink_net_exit,
4738};
4739
4740void __init rtnetlink_init(void)
4741{
4742 if (register_pernet_subsys(&rtnetlink_net_ops))
4743 panic("rtnetlink_init: cannot initialize rtnetlink\n");
4744
4745 register_netdevice_notifier(&rtnetlink_dev_notifier);
4746
4747 rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink,
4748 rtnl_dump_ifinfo, 0);
4749 rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, 0);
4750 rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, 0);
4751 rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, 0);
4752
4753 rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, 0);
4754 rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, 0);
4755 rtnl_register(PF_UNSPEC, RTM_GETNETCONF, NULL, rtnl_dump_all, 0);
4756
4757 rtnl_register(PF_BRIDGE, RTM_NEWNEIGH, rtnl_fdb_add, NULL, 0);
4758 rtnl_register(PF_BRIDGE, RTM_DELNEIGH, rtnl_fdb_del, NULL, 0);
4759 rtnl_register(PF_BRIDGE, RTM_GETNEIGH, NULL, rtnl_fdb_dump, 0);
4760
4761 rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, rtnl_bridge_getlink, 0);
4762 rtnl_register(PF_BRIDGE, RTM_DELLINK, rtnl_bridge_dellink, NULL, 0);
4763 rtnl_register(PF_BRIDGE, RTM_SETLINK, rtnl_bridge_setlink, NULL, 0);
4764
4765 rtnl_register(PF_UNSPEC, RTM_GETSTATS, rtnl_stats_get, rtnl_stats_dump,
4766 0);
4767}