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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * NET3 IP device support routines.
4 *
5 * Derived from the IP parts of dev.c 1.0.19
6 * Authors: Ross Biro
7 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
8 * Mark Evans, <evansmp@uhura.aston.ac.uk>
9 *
10 * Additional Authors:
11 * Alan Cox, <gw4pts@gw4pts.ampr.org>
12 * Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
13 *
14 * Changes:
15 * Alexey Kuznetsov: pa_* fields are replaced with ifaddr
16 * lists.
17 * Cyrus Durgin: updated for kmod
18 * Matthias Andree: in devinet_ioctl, compare label and
19 * address (4.4BSD alias style support),
20 * fall back to comparing just the label
21 * if no match found.
22 */
23
24
25#include <linux/uaccess.h>
26#include <linux/bitops.h>
27#include <linux/capability.h>
28#include <linux/module.h>
29#include <linux/types.h>
30#include <linux/kernel.h>
31#include <linux/sched/signal.h>
32#include <linux/string.h>
33#include <linux/mm.h>
34#include <linux/socket.h>
35#include <linux/sockios.h>
36#include <linux/in.h>
37#include <linux/errno.h>
38#include <linux/interrupt.h>
39#include <linux/if_addr.h>
40#include <linux/if_ether.h>
41#include <linux/inet.h>
42#include <linux/netdevice.h>
43#include <linux/etherdevice.h>
44#include <linux/skbuff.h>
45#include <linux/init.h>
46#include <linux/notifier.h>
47#include <linux/inetdevice.h>
48#include <linux/igmp.h>
49#include <linux/slab.h>
50#include <linux/hash.h>
51#ifdef CONFIG_SYSCTL
52#include <linux/sysctl.h>
53#endif
54#include <linux/kmod.h>
55#include <linux/netconf.h>
56
57#include <net/arp.h>
58#include <net/ip.h>
59#include <net/route.h>
60#include <net/ip_fib.h>
61#include <net/rtnetlink.h>
62#include <net/net_namespace.h>
63#include <net/addrconf.h>
64
65#define IPV6ONLY_FLAGS \
66 (IFA_F_NODAD | IFA_F_OPTIMISTIC | IFA_F_DADFAILED | \
67 IFA_F_HOMEADDRESS | IFA_F_TENTATIVE | \
68 IFA_F_MANAGETEMPADDR | IFA_F_STABLE_PRIVACY)
69
70static struct ipv4_devconf ipv4_devconf = {
71 .data = {
72 [IPV4_DEVCONF_ACCEPT_REDIRECTS - 1] = 1,
73 [IPV4_DEVCONF_SEND_REDIRECTS - 1] = 1,
74 [IPV4_DEVCONF_SECURE_REDIRECTS - 1] = 1,
75 [IPV4_DEVCONF_SHARED_MEDIA - 1] = 1,
76 [IPV4_DEVCONF_IGMPV2_UNSOLICITED_REPORT_INTERVAL - 1] = 10000 /*ms*/,
77 [IPV4_DEVCONF_IGMPV3_UNSOLICITED_REPORT_INTERVAL - 1] = 1000 /*ms*/,
78 },
79};
80
81static struct ipv4_devconf ipv4_devconf_dflt = {
82 .data = {
83 [IPV4_DEVCONF_ACCEPT_REDIRECTS - 1] = 1,
84 [IPV4_DEVCONF_SEND_REDIRECTS - 1] = 1,
85 [IPV4_DEVCONF_SECURE_REDIRECTS - 1] = 1,
86 [IPV4_DEVCONF_SHARED_MEDIA - 1] = 1,
87 [IPV4_DEVCONF_ACCEPT_SOURCE_ROUTE - 1] = 1,
88 [IPV4_DEVCONF_IGMPV2_UNSOLICITED_REPORT_INTERVAL - 1] = 10000 /*ms*/,
89 [IPV4_DEVCONF_IGMPV3_UNSOLICITED_REPORT_INTERVAL - 1] = 1000 /*ms*/,
90 },
91};
92
93#define IPV4_DEVCONF_DFLT(net, attr) \
94 IPV4_DEVCONF((*net->ipv4.devconf_dflt), attr)
95
96static const struct nla_policy ifa_ipv4_policy[IFA_MAX+1] = {
97 [IFA_LOCAL] = { .type = NLA_U32 },
98 [IFA_ADDRESS] = { .type = NLA_U32 },
99 [IFA_BROADCAST] = { .type = NLA_U32 },
100 [IFA_LABEL] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 },
101 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
102 [IFA_FLAGS] = { .type = NLA_U32 },
103 [IFA_RT_PRIORITY] = { .type = NLA_U32 },
104 [IFA_TARGET_NETNSID] = { .type = NLA_S32 },
105};
106
107struct inet_fill_args {
108 u32 portid;
109 u32 seq;
110 int event;
111 unsigned int flags;
112 int netnsid;
113 int ifindex;
114};
115
116#define IN4_ADDR_HSIZE_SHIFT 8
117#define IN4_ADDR_HSIZE (1U << IN4_ADDR_HSIZE_SHIFT)
118
119static struct hlist_head inet_addr_lst[IN4_ADDR_HSIZE];
120
121static u32 inet_addr_hash(const struct net *net, __be32 addr)
122{
123 u32 val = (__force u32) addr ^ net_hash_mix(net);
124
125 return hash_32(val, IN4_ADDR_HSIZE_SHIFT);
126}
127
128static void inet_hash_insert(struct net *net, struct in_ifaddr *ifa)
129{
130 u32 hash = inet_addr_hash(net, ifa->ifa_local);
131
132 ASSERT_RTNL();
133 hlist_add_head_rcu(&ifa->hash, &inet_addr_lst[hash]);
134}
135
136static void inet_hash_remove(struct in_ifaddr *ifa)
137{
138 ASSERT_RTNL();
139 hlist_del_init_rcu(&ifa->hash);
140}
141
142/**
143 * __ip_dev_find - find the first device with a given source address.
144 * @net: the net namespace
145 * @addr: the source address
146 * @devref: if true, take a reference on the found device
147 *
148 * If a caller uses devref=false, it should be protected by RCU, or RTNL
149 */
150struct net_device *__ip_dev_find(struct net *net, __be32 addr, bool devref)
151{
152 struct net_device *result = NULL;
153 struct in_ifaddr *ifa;
154
155 rcu_read_lock();
156 ifa = inet_lookup_ifaddr_rcu(net, addr);
157 if (!ifa) {
158 struct flowi4 fl4 = { .daddr = addr };
159 struct fib_result res = { 0 };
160 struct fib_table *local;
161
162 /* Fallback to FIB local table so that communication
163 * over loopback subnets work.
164 */
165 local = fib_get_table(net, RT_TABLE_LOCAL);
166 if (local &&
167 !fib_table_lookup(local, &fl4, &res, FIB_LOOKUP_NOREF) &&
168 res.type == RTN_LOCAL)
169 result = FIB_RES_DEV(res);
170 } else {
171 result = ifa->ifa_dev->dev;
172 }
173 if (result && devref)
174 dev_hold(result);
175 rcu_read_unlock();
176 return result;
177}
178EXPORT_SYMBOL(__ip_dev_find);
179
180/* called under RCU lock */
181struct in_ifaddr *inet_lookup_ifaddr_rcu(struct net *net, __be32 addr)
182{
183 u32 hash = inet_addr_hash(net, addr);
184 struct in_ifaddr *ifa;
185
186 hlist_for_each_entry_rcu(ifa, &inet_addr_lst[hash], hash)
187 if (ifa->ifa_local == addr &&
188 net_eq(dev_net(ifa->ifa_dev->dev), net))
189 return ifa;
190
191 return NULL;
192}
193
194static void rtmsg_ifa(int event, struct in_ifaddr *, struct nlmsghdr *, u32);
195
196static BLOCKING_NOTIFIER_HEAD(inetaddr_chain);
197static BLOCKING_NOTIFIER_HEAD(inetaddr_validator_chain);
198static void inet_del_ifa(struct in_device *in_dev,
199 struct in_ifaddr __rcu **ifap,
200 int destroy);
201#ifdef CONFIG_SYSCTL
202static int devinet_sysctl_register(struct in_device *idev);
203static void devinet_sysctl_unregister(struct in_device *idev);
204#else
205static int devinet_sysctl_register(struct in_device *idev)
206{
207 return 0;
208}
209static void devinet_sysctl_unregister(struct in_device *idev)
210{
211}
212#endif
213
214/* Locks all the inet devices. */
215
216static struct in_ifaddr *inet_alloc_ifa(void)
217{
218 return kzalloc(sizeof(struct in_ifaddr), GFP_KERNEL);
219}
220
221static void inet_rcu_free_ifa(struct rcu_head *head)
222{
223 struct in_ifaddr *ifa = container_of(head, struct in_ifaddr, rcu_head);
224 if (ifa->ifa_dev)
225 in_dev_put(ifa->ifa_dev);
226 kfree(ifa);
227}
228
229static void inet_free_ifa(struct in_ifaddr *ifa)
230{
231 call_rcu(&ifa->rcu_head, inet_rcu_free_ifa);
232}
233
234void in_dev_finish_destroy(struct in_device *idev)
235{
236 struct net_device *dev = idev->dev;
237
238 WARN_ON(idev->ifa_list);
239 WARN_ON(idev->mc_list);
240 kfree(rcu_dereference_protected(idev->mc_hash, 1));
241#ifdef NET_REFCNT_DEBUG
242 pr_debug("%s: %p=%s\n", __func__, idev, dev ? dev->name : "NIL");
243#endif
244 dev_put(dev);
245 if (!idev->dead)
246 pr_err("Freeing alive in_device %p\n", idev);
247 else
248 kfree(idev);
249}
250EXPORT_SYMBOL(in_dev_finish_destroy);
251
252static struct in_device *inetdev_init(struct net_device *dev)
253{
254 struct in_device *in_dev;
255 int err = -ENOMEM;
256
257 ASSERT_RTNL();
258
259 in_dev = kzalloc(sizeof(*in_dev), GFP_KERNEL);
260 if (!in_dev)
261 goto out;
262 memcpy(&in_dev->cnf, dev_net(dev)->ipv4.devconf_dflt,
263 sizeof(in_dev->cnf));
264 in_dev->cnf.sysctl = NULL;
265 in_dev->dev = dev;
266 in_dev->arp_parms = neigh_parms_alloc(dev, &arp_tbl);
267 if (!in_dev->arp_parms)
268 goto out_kfree;
269 if (IPV4_DEVCONF(in_dev->cnf, FORWARDING))
270 dev_disable_lro(dev);
271 /* Reference in_dev->dev */
272 dev_hold(dev);
273 /* Account for reference dev->ip_ptr (below) */
274 refcount_set(&in_dev->refcnt, 1);
275
276 err = devinet_sysctl_register(in_dev);
277 if (err) {
278 in_dev->dead = 1;
279 neigh_parms_release(&arp_tbl, in_dev->arp_parms);
280 in_dev_put(in_dev);
281 in_dev = NULL;
282 goto out;
283 }
284 ip_mc_init_dev(in_dev);
285 if (dev->flags & IFF_UP)
286 ip_mc_up(in_dev);
287
288 /* we can receive as soon as ip_ptr is set -- do this last */
289 rcu_assign_pointer(dev->ip_ptr, in_dev);
290out:
291 return in_dev ?: ERR_PTR(err);
292out_kfree:
293 kfree(in_dev);
294 in_dev = NULL;
295 goto out;
296}
297
298static void in_dev_rcu_put(struct rcu_head *head)
299{
300 struct in_device *idev = container_of(head, struct in_device, rcu_head);
301 in_dev_put(idev);
302}
303
304static void inetdev_destroy(struct in_device *in_dev)
305{
306 struct net_device *dev;
307 struct in_ifaddr *ifa;
308
309 ASSERT_RTNL();
310
311 dev = in_dev->dev;
312
313 in_dev->dead = 1;
314
315 ip_mc_destroy_dev(in_dev);
316
317 while ((ifa = rtnl_dereference(in_dev->ifa_list)) != NULL) {
318 inet_del_ifa(in_dev, &in_dev->ifa_list, 0);
319 inet_free_ifa(ifa);
320 }
321
322 RCU_INIT_POINTER(dev->ip_ptr, NULL);
323
324 devinet_sysctl_unregister(in_dev);
325 neigh_parms_release(&arp_tbl, in_dev->arp_parms);
326 arp_ifdown(dev);
327
328 call_rcu(&in_dev->rcu_head, in_dev_rcu_put);
329}
330
331int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b)
332{
333 const struct in_ifaddr *ifa;
334
335 rcu_read_lock();
336 in_dev_for_each_ifa_rcu(ifa, in_dev) {
337 if (inet_ifa_match(a, ifa)) {
338 if (!b || inet_ifa_match(b, ifa)) {
339 rcu_read_unlock();
340 return 1;
341 }
342 }
343 }
344 rcu_read_unlock();
345 return 0;
346}
347
348static void __inet_del_ifa(struct in_device *in_dev,
349 struct in_ifaddr __rcu **ifap,
350 int destroy, struct nlmsghdr *nlh, u32 portid)
351{
352 struct in_ifaddr *promote = NULL;
353 struct in_ifaddr *ifa, *ifa1;
354 struct in_ifaddr *last_prim;
355 struct in_ifaddr *prev_prom = NULL;
356 int do_promote = IN_DEV_PROMOTE_SECONDARIES(in_dev);
357
358 ASSERT_RTNL();
359
360 ifa1 = rtnl_dereference(*ifap);
361 last_prim = rtnl_dereference(in_dev->ifa_list);
362 if (in_dev->dead)
363 goto no_promotions;
364
365 /* 1. Deleting primary ifaddr forces deletion all secondaries
366 * unless alias promotion is set
367 **/
368
369 if (!(ifa1->ifa_flags & IFA_F_SECONDARY)) {
370 struct in_ifaddr __rcu **ifap1 = &ifa1->ifa_next;
371
372 while ((ifa = rtnl_dereference(*ifap1)) != NULL) {
373 if (!(ifa->ifa_flags & IFA_F_SECONDARY) &&
374 ifa1->ifa_scope <= ifa->ifa_scope)
375 last_prim = ifa;
376
377 if (!(ifa->ifa_flags & IFA_F_SECONDARY) ||
378 ifa1->ifa_mask != ifa->ifa_mask ||
379 !inet_ifa_match(ifa1->ifa_address, ifa)) {
380 ifap1 = &ifa->ifa_next;
381 prev_prom = ifa;
382 continue;
383 }
384
385 if (!do_promote) {
386 inet_hash_remove(ifa);
387 *ifap1 = ifa->ifa_next;
388
389 rtmsg_ifa(RTM_DELADDR, ifa, nlh, portid);
390 blocking_notifier_call_chain(&inetaddr_chain,
391 NETDEV_DOWN, ifa);
392 inet_free_ifa(ifa);
393 } else {
394 promote = ifa;
395 break;
396 }
397 }
398 }
399
400 /* On promotion all secondaries from subnet are changing
401 * the primary IP, we must remove all their routes silently
402 * and later to add them back with new prefsrc. Do this
403 * while all addresses are on the device list.
404 */
405 for (ifa = promote; ifa; ifa = rtnl_dereference(ifa->ifa_next)) {
406 if (ifa1->ifa_mask == ifa->ifa_mask &&
407 inet_ifa_match(ifa1->ifa_address, ifa))
408 fib_del_ifaddr(ifa, ifa1);
409 }
410
411no_promotions:
412 /* 2. Unlink it */
413
414 *ifap = ifa1->ifa_next;
415 inet_hash_remove(ifa1);
416
417 /* 3. Announce address deletion */
418
419 /* Send message first, then call notifier.
420 At first sight, FIB update triggered by notifier
421 will refer to already deleted ifaddr, that could confuse
422 netlink listeners. It is not true: look, gated sees
423 that route deleted and if it still thinks that ifaddr
424 is valid, it will try to restore deleted routes... Grr.
425 So that, this order is correct.
426 */
427 rtmsg_ifa(RTM_DELADDR, ifa1, nlh, portid);
428 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa1);
429
430 if (promote) {
431 struct in_ifaddr *next_sec;
432
433 next_sec = rtnl_dereference(promote->ifa_next);
434 if (prev_prom) {
435 struct in_ifaddr *last_sec;
436
437 rcu_assign_pointer(prev_prom->ifa_next, next_sec);
438
439 last_sec = rtnl_dereference(last_prim->ifa_next);
440 rcu_assign_pointer(promote->ifa_next, last_sec);
441 rcu_assign_pointer(last_prim->ifa_next, promote);
442 }
443
444 promote->ifa_flags &= ~IFA_F_SECONDARY;
445 rtmsg_ifa(RTM_NEWADDR, promote, nlh, portid);
446 blocking_notifier_call_chain(&inetaddr_chain,
447 NETDEV_UP, promote);
448 for (ifa = next_sec; ifa;
449 ifa = rtnl_dereference(ifa->ifa_next)) {
450 if (ifa1->ifa_mask != ifa->ifa_mask ||
451 !inet_ifa_match(ifa1->ifa_address, ifa))
452 continue;
453 fib_add_ifaddr(ifa);
454 }
455
456 }
457 if (destroy)
458 inet_free_ifa(ifa1);
459}
460
461static void inet_del_ifa(struct in_device *in_dev,
462 struct in_ifaddr __rcu **ifap,
463 int destroy)
464{
465 __inet_del_ifa(in_dev, ifap, destroy, NULL, 0);
466}
467
468static void check_lifetime(struct work_struct *work);
469
470static DECLARE_DELAYED_WORK(check_lifetime_work, check_lifetime);
471
472static int __inet_insert_ifa(struct in_ifaddr *ifa, struct nlmsghdr *nlh,
473 u32 portid, struct netlink_ext_ack *extack)
474{
475 struct in_ifaddr __rcu **last_primary, **ifap;
476 struct in_device *in_dev = ifa->ifa_dev;
477 struct in_validator_info ivi;
478 struct in_ifaddr *ifa1;
479 int ret;
480
481 ASSERT_RTNL();
482
483 if (!ifa->ifa_local) {
484 inet_free_ifa(ifa);
485 return 0;
486 }
487
488 ifa->ifa_flags &= ~IFA_F_SECONDARY;
489 last_primary = &in_dev->ifa_list;
490
491 /* Don't set IPv6 only flags to IPv4 addresses */
492 ifa->ifa_flags &= ~IPV6ONLY_FLAGS;
493
494 ifap = &in_dev->ifa_list;
495 ifa1 = rtnl_dereference(*ifap);
496
497 while (ifa1) {
498 if (!(ifa1->ifa_flags & IFA_F_SECONDARY) &&
499 ifa->ifa_scope <= ifa1->ifa_scope)
500 last_primary = &ifa1->ifa_next;
501 if (ifa1->ifa_mask == ifa->ifa_mask &&
502 inet_ifa_match(ifa1->ifa_address, ifa)) {
503 if (ifa1->ifa_local == ifa->ifa_local) {
504 inet_free_ifa(ifa);
505 return -EEXIST;
506 }
507 if (ifa1->ifa_scope != ifa->ifa_scope) {
508 inet_free_ifa(ifa);
509 return -EINVAL;
510 }
511 ifa->ifa_flags |= IFA_F_SECONDARY;
512 }
513
514 ifap = &ifa1->ifa_next;
515 ifa1 = rtnl_dereference(*ifap);
516 }
517
518 /* Allow any devices that wish to register ifaddr validtors to weigh
519 * in now, before changes are committed. The rntl lock is serializing
520 * access here, so the state should not change between a validator call
521 * and a final notify on commit. This isn't invoked on promotion under
522 * the assumption that validators are checking the address itself, and
523 * not the flags.
524 */
525 ivi.ivi_addr = ifa->ifa_address;
526 ivi.ivi_dev = ifa->ifa_dev;
527 ivi.extack = extack;
528 ret = blocking_notifier_call_chain(&inetaddr_validator_chain,
529 NETDEV_UP, &ivi);
530 ret = notifier_to_errno(ret);
531 if (ret) {
532 inet_free_ifa(ifa);
533 return ret;
534 }
535
536 if (!(ifa->ifa_flags & IFA_F_SECONDARY)) {
537 prandom_seed((__force u32) ifa->ifa_local);
538 ifap = last_primary;
539 }
540
541 rcu_assign_pointer(ifa->ifa_next, *ifap);
542 rcu_assign_pointer(*ifap, ifa);
543
544 inet_hash_insert(dev_net(in_dev->dev), ifa);
545
546 cancel_delayed_work(&check_lifetime_work);
547 queue_delayed_work(system_power_efficient_wq, &check_lifetime_work, 0);
548
549 /* Send message first, then call notifier.
550 Notifier will trigger FIB update, so that
551 listeners of netlink will know about new ifaddr */
552 rtmsg_ifa(RTM_NEWADDR, ifa, nlh, portid);
553 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa);
554
555 return 0;
556}
557
558static int inet_insert_ifa(struct in_ifaddr *ifa)
559{
560 return __inet_insert_ifa(ifa, NULL, 0, NULL);
561}
562
563static int inet_set_ifa(struct net_device *dev, struct in_ifaddr *ifa)
564{
565 struct in_device *in_dev = __in_dev_get_rtnl(dev);
566
567 ASSERT_RTNL();
568
569 if (!in_dev) {
570 inet_free_ifa(ifa);
571 return -ENOBUFS;
572 }
573 ipv4_devconf_setall(in_dev);
574 neigh_parms_data_state_setall(in_dev->arp_parms);
575 if (ifa->ifa_dev != in_dev) {
576 WARN_ON(ifa->ifa_dev);
577 in_dev_hold(in_dev);
578 ifa->ifa_dev = in_dev;
579 }
580 if (ipv4_is_loopback(ifa->ifa_local))
581 ifa->ifa_scope = RT_SCOPE_HOST;
582 return inet_insert_ifa(ifa);
583}
584
585/* Caller must hold RCU or RTNL :
586 * We dont take a reference on found in_device
587 */
588struct in_device *inetdev_by_index(struct net *net, int ifindex)
589{
590 struct net_device *dev;
591 struct in_device *in_dev = NULL;
592
593 rcu_read_lock();
594 dev = dev_get_by_index_rcu(net, ifindex);
595 if (dev)
596 in_dev = rcu_dereference_rtnl(dev->ip_ptr);
597 rcu_read_unlock();
598 return in_dev;
599}
600EXPORT_SYMBOL(inetdev_by_index);
601
602/* Called only from RTNL semaphored context. No locks. */
603
604struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix,
605 __be32 mask)
606{
607 struct in_ifaddr *ifa;
608
609 ASSERT_RTNL();
610
611 in_dev_for_each_ifa_rtnl(ifa, in_dev) {
612 if (ifa->ifa_mask == mask && inet_ifa_match(prefix, ifa))
613 return ifa;
614 }
615 return NULL;
616}
617
618static int ip_mc_autojoin_config(struct net *net, bool join,
619 const struct in_ifaddr *ifa)
620{
621#if defined(CONFIG_IP_MULTICAST)
622 struct ip_mreqn mreq = {
623 .imr_multiaddr.s_addr = ifa->ifa_address,
624 .imr_ifindex = ifa->ifa_dev->dev->ifindex,
625 };
626 struct sock *sk = net->ipv4.mc_autojoin_sk;
627 int ret;
628
629 ASSERT_RTNL();
630
631 lock_sock(sk);
632 if (join)
633 ret = ip_mc_join_group(sk, &mreq);
634 else
635 ret = ip_mc_leave_group(sk, &mreq);
636 release_sock(sk);
637
638 return ret;
639#else
640 return -EOPNOTSUPP;
641#endif
642}
643
644static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
645 struct netlink_ext_ack *extack)
646{
647 struct net *net = sock_net(skb->sk);
648 struct in_ifaddr __rcu **ifap;
649 struct nlattr *tb[IFA_MAX+1];
650 struct in_device *in_dev;
651 struct ifaddrmsg *ifm;
652 struct in_ifaddr *ifa;
653
654 int err = -EINVAL;
655
656 ASSERT_RTNL();
657
658 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
659 ifa_ipv4_policy, extack);
660 if (err < 0)
661 goto errout;
662
663 ifm = nlmsg_data(nlh);
664 in_dev = inetdev_by_index(net, ifm->ifa_index);
665 if (!in_dev) {
666 err = -ENODEV;
667 goto errout;
668 }
669
670 for (ifap = &in_dev->ifa_list; (ifa = rtnl_dereference(*ifap)) != NULL;
671 ifap = &ifa->ifa_next) {
672 if (tb[IFA_LOCAL] &&
673 ifa->ifa_local != nla_get_in_addr(tb[IFA_LOCAL]))
674 continue;
675
676 if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label))
677 continue;
678
679 if (tb[IFA_ADDRESS] &&
680 (ifm->ifa_prefixlen != ifa->ifa_prefixlen ||
681 !inet_ifa_match(nla_get_in_addr(tb[IFA_ADDRESS]), ifa)))
682 continue;
683
684 if (ipv4_is_multicast(ifa->ifa_address))
685 ip_mc_autojoin_config(net, false, ifa);
686 __inet_del_ifa(in_dev, ifap, 1, nlh, NETLINK_CB(skb).portid);
687 return 0;
688 }
689
690 err = -EADDRNOTAVAIL;
691errout:
692 return err;
693}
694
695#define INFINITY_LIFE_TIME 0xFFFFFFFF
696
697static void check_lifetime(struct work_struct *work)
698{
699 unsigned long now, next, next_sec, next_sched;
700 struct in_ifaddr *ifa;
701 struct hlist_node *n;
702 int i;
703
704 now = jiffies;
705 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
706
707 for (i = 0; i < IN4_ADDR_HSIZE; i++) {
708 bool change_needed = false;
709
710 rcu_read_lock();
711 hlist_for_each_entry_rcu(ifa, &inet_addr_lst[i], hash) {
712 unsigned long age;
713
714 if (ifa->ifa_flags & IFA_F_PERMANENT)
715 continue;
716
717 /* We try to batch several events at once. */
718 age = (now - ifa->ifa_tstamp +
719 ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
720
721 if (ifa->ifa_valid_lft != INFINITY_LIFE_TIME &&
722 age >= ifa->ifa_valid_lft) {
723 change_needed = true;
724 } else if (ifa->ifa_preferred_lft ==
725 INFINITY_LIFE_TIME) {
726 continue;
727 } else if (age >= ifa->ifa_preferred_lft) {
728 if (time_before(ifa->ifa_tstamp +
729 ifa->ifa_valid_lft * HZ, next))
730 next = ifa->ifa_tstamp +
731 ifa->ifa_valid_lft * HZ;
732
733 if (!(ifa->ifa_flags & IFA_F_DEPRECATED))
734 change_needed = true;
735 } else if (time_before(ifa->ifa_tstamp +
736 ifa->ifa_preferred_lft * HZ,
737 next)) {
738 next = ifa->ifa_tstamp +
739 ifa->ifa_preferred_lft * HZ;
740 }
741 }
742 rcu_read_unlock();
743 if (!change_needed)
744 continue;
745 rtnl_lock();
746 hlist_for_each_entry_safe(ifa, n, &inet_addr_lst[i], hash) {
747 unsigned long age;
748
749 if (ifa->ifa_flags & IFA_F_PERMANENT)
750 continue;
751
752 /* We try to batch several events at once. */
753 age = (now - ifa->ifa_tstamp +
754 ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
755
756 if (ifa->ifa_valid_lft != INFINITY_LIFE_TIME &&
757 age >= ifa->ifa_valid_lft) {
758 struct in_ifaddr __rcu **ifap;
759 struct in_ifaddr *tmp;
760
761 ifap = &ifa->ifa_dev->ifa_list;
762 tmp = rtnl_dereference(*ifap);
763 while (tmp) {
764 if (tmp == ifa) {
765 inet_del_ifa(ifa->ifa_dev,
766 ifap, 1);
767 break;
768 }
769 ifap = &tmp->ifa_next;
770 tmp = rtnl_dereference(*ifap);
771 }
772 } else if (ifa->ifa_preferred_lft !=
773 INFINITY_LIFE_TIME &&
774 age >= ifa->ifa_preferred_lft &&
775 !(ifa->ifa_flags & IFA_F_DEPRECATED)) {
776 ifa->ifa_flags |= IFA_F_DEPRECATED;
777 rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0);
778 }
779 }
780 rtnl_unlock();
781 }
782
783 next_sec = round_jiffies_up(next);
784 next_sched = next;
785
786 /* If rounded timeout is accurate enough, accept it. */
787 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
788 next_sched = next_sec;
789
790 now = jiffies;
791 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
792 if (time_before(next_sched, now + ADDRCONF_TIMER_FUZZ_MAX))
793 next_sched = now + ADDRCONF_TIMER_FUZZ_MAX;
794
795 queue_delayed_work(system_power_efficient_wq, &check_lifetime_work,
796 next_sched - now);
797}
798
799static void set_ifa_lifetime(struct in_ifaddr *ifa, __u32 valid_lft,
800 __u32 prefered_lft)
801{
802 unsigned long timeout;
803
804 ifa->ifa_flags &= ~(IFA_F_PERMANENT | IFA_F_DEPRECATED);
805
806 timeout = addrconf_timeout_fixup(valid_lft, HZ);
807 if (addrconf_finite_timeout(timeout))
808 ifa->ifa_valid_lft = timeout;
809 else
810 ifa->ifa_flags |= IFA_F_PERMANENT;
811
812 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
813 if (addrconf_finite_timeout(timeout)) {
814 if (timeout == 0)
815 ifa->ifa_flags |= IFA_F_DEPRECATED;
816 ifa->ifa_preferred_lft = timeout;
817 }
818 ifa->ifa_tstamp = jiffies;
819 if (!ifa->ifa_cstamp)
820 ifa->ifa_cstamp = ifa->ifa_tstamp;
821}
822
823static struct in_ifaddr *rtm_to_ifaddr(struct net *net, struct nlmsghdr *nlh,
824 __u32 *pvalid_lft, __u32 *pprefered_lft,
825 struct netlink_ext_ack *extack)
826{
827 struct nlattr *tb[IFA_MAX+1];
828 struct in_ifaddr *ifa;
829 struct ifaddrmsg *ifm;
830 struct net_device *dev;
831 struct in_device *in_dev;
832 int err;
833
834 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
835 ifa_ipv4_policy, extack);
836 if (err < 0)
837 goto errout;
838
839 ifm = nlmsg_data(nlh);
840 err = -EINVAL;
841 if (ifm->ifa_prefixlen > 32 || !tb[IFA_LOCAL])
842 goto errout;
843
844 dev = __dev_get_by_index(net, ifm->ifa_index);
845 err = -ENODEV;
846 if (!dev)
847 goto errout;
848
849 in_dev = __in_dev_get_rtnl(dev);
850 err = -ENOBUFS;
851 if (!in_dev)
852 goto errout;
853
854 ifa = inet_alloc_ifa();
855 if (!ifa)
856 /*
857 * A potential indev allocation can be left alive, it stays
858 * assigned to its device and is destroy with it.
859 */
860 goto errout;
861
862 ipv4_devconf_setall(in_dev);
863 neigh_parms_data_state_setall(in_dev->arp_parms);
864 in_dev_hold(in_dev);
865
866 if (!tb[IFA_ADDRESS])
867 tb[IFA_ADDRESS] = tb[IFA_LOCAL];
868
869 INIT_HLIST_NODE(&ifa->hash);
870 ifa->ifa_prefixlen = ifm->ifa_prefixlen;
871 ifa->ifa_mask = inet_make_mask(ifm->ifa_prefixlen);
872 ifa->ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) :
873 ifm->ifa_flags;
874 ifa->ifa_scope = ifm->ifa_scope;
875 ifa->ifa_dev = in_dev;
876
877 ifa->ifa_local = nla_get_in_addr(tb[IFA_LOCAL]);
878 ifa->ifa_address = nla_get_in_addr(tb[IFA_ADDRESS]);
879
880 if (tb[IFA_BROADCAST])
881 ifa->ifa_broadcast = nla_get_in_addr(tb[IFA_BROADCAST]);
882
883 if (tb[IFA_LABEL])
884 nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ);
885 else
886 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
887
888 if (tb[IFA_RT_PRIORITY])
889 ifa->ifa_rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]);
890
891 if (tb[IFA_CACHEINFO]) {
892 struct ifa_cacheinfo *ci;
893
894 ci = nla_data(tb[IFA_CACHEINFO]);
895 if (!ci->ifa_valid || ci->ifa_prefered > ci->ifa_valid) {
896 err = -EINVAL;
897 goto errout_free;
898 }
899 *pvalid_lft = ci->ifa_valid;
900 *pprefered_lft = ci->ifa_prefered;
901 }
902
903 return ifa;
904
905errout_free:
906 inet_free_ifa(ifa);
907errout:
908 return ERR_PTR(err);
909}
910
911static struct in_ifaddr *find_matching_ifa(struct in_ifaddr *ifa)
912{
913 struct in_device *in_dev = ifa->ifa_dev;
914 struct in_ifaddr *ifa1;
915
916 if (!ifa->ifa_local)
917 return NULL;
918
919 in_dev_for_each_ifa_rtnl(ifa1, in_dev) {
920 if (ifa1->ifa_mask == ifa->ifa_mask &&
921 inet_ifa_match(ifa1->ifa_address, ifa) &&
922 ifa1->ifa_local == ifa->ifa_local)
923 return ifa1;
924 }
925 return NULL;
926}
927
928static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
929 struct netlink_ext_ack *extack)
930{
931 struct net *net = sock_net(skb->sk);
932 struct in_ifaddr *ifa;
933 struct in_ifaddr *ifa_existing;
934 __u32 valid_lft = INFINITY_LIFE_TIME;
935 __u32 prefered_lft = INFINITY_LIFE_TIME;
936
937 ASSERT_RTNL();
938
939 ifa = rtm_to_ifaddr(net, nlh, &valid_lft, &prefered_lft, extack);
940 if (IS_ERR(ifa))
941 return PTR_ERR(ifa);
942
943 ifa_existing = find_matching_ifa(ifa);
944 if (!ifa_existing) {
945 /* It would be best to check for !NLM_F_CREATE here but
946 * userspace already relies on not having to provide this.
947 */
948 set_ifa_lifetime(ifa, valid_lft, prefered_lft);
949 if (ifa->ifa_flags & IFA_F_MCAUTOJOIN) {
950 int ret = ip_mc_autojoin_config(net, true, ifa);
951
952 if (ret < 0) {
953 inet_free_ifa(ifa);
954 return ret;
955 }
956 }
957 return __inet_insert_ifa(ifa, nlh, NETLINK_CB(skb).portid,
958 extack);
959 } else {
960 u32 new_metric = ifa->ifa_rt_priority;
961
962 inet_free_ifa(ifa);
963
964 if (nlh->nlmsg_flags & NLM_F_EXCL ||
965 !(nlh->nlmsg_flags & NLM_F_REPLACE))
966 return -EEXIST;
967 ifa = ifa_existing;
968
969 if (ifa->ifa_rt_priority != new_metric) {
970 fib_modify_prefix_metric(ifa, new_metric);
971 ifa->ifa_rt_priority = new_metric;
972 }
973
974 set_ifa_lifetime(ifa, valid_lft, prefered_lft);
975 cancel_delayed_work(&check_lifetime_work);
976 queue_delayed_work(system_power_efficient_wq,
977 &check_lifetime_work, 0);
978 rtmsg_ifa(RTM_NEWADDR, ifa, nlh, NETLINK_CB(skb).portid);
979 }
980 return 0;
981}
982
983/*
984 * Determine a default network mask, based on the IP address.
985 */
986
987static int inet_abc_len(__be32 addr)
988{
989 int rc = -1; /* Something else, probably a multicast. */
990
991 if (ipv4_is_zeronet(addr) || ipv4_is_lbcast(addr))
992 rc = 0;
993 else {
994 __u32 haddr = ntohl(addr);
995 if (IN_CLASSA(haddr))
996 rc = 8;
997 else if (IN_CLASSB(haddr))
998 rc = 16;
999 else if (IN_CLASSC(haddr))
1000 rc = 24;
1001 else if (IN_CLASSE(haddr))
1002 rc = 32;
1003 }
1004
1005 return rc;
1006}
1007
1008
1009int devinet_ioctl(struct net *net, unsigned int cmd, struct ifreq *ifr)
1010{
1011 struct sockaddr_in sin_orig;
1012 struct sockaddr_in *sin = (struct sockaddr_in *)&ifr->ifr_addr;
1013 struct in_ifaddr __rcu **ifap = NULL;
1014 struct in_device *in_dev;
1015 struct in_ifaddr *ifa = NULL;
1016 struct net_device *dev;
1017 char *colon;
1018 int ret = -EFAULT;
1019 int tryaddrmatch = 0;
1020
1021 ifr->ifr_name[IFNAMSIZ - 1] = 0;
1022
1023 /* save original address for comparison */
1024 memcpy(&sin_orig, sin, sizeof(*sin));
1025
1026 colon = strchr(ifr->ifr_name, ':');
1027 if (colon)
1028 *colon = 0;
1029
1030 dev_load(net, ifr->ifr_name);
1031
1032 switch (cmd) {
1033 case SIOCGIFADDR: /* Get interface address */
1034 case SIOCGIFBRDADDR: /* Get the broadcast address */
1035 case SIOCGIFDSTADDR: /* Get the destination address */
1036 case SIOCGIFNETMASK: /* Get the netmask for the interface */
1037 /* Note that these ioctls will not sleep,
1038 so that we do not impose a lock.
1039 One day we will be forced to put shlock here (I mean SMP)
1040 */
1041 tryaddrmatch = (sin_orig.sin_family == AF_INET);
1042 memset(sin, 0, sizeof(*sin));
1043 sin->sin_family = AF_INET;
1044 break;
1045
1046 case SIOCSIFFLAGS:
1047 ret = -EPERM;
1048 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1049 goto out;
1050 break;
1051 case SIOCSIFADDR: /* Set interface address (and family) */
1052 case SIOCSIFBRDADDR: /* Set the broadcast address */
1053 case SIOCSIFDSTADDR: /* Set the destination address */
1054 case SIOCSIFNETMASK: /* Set the netmask for the interface */
1055 ret = -EPERM;
1056 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1057 goto out;
1058 ret = -EINVAL;
1059 if (sin->sin_family != AF_INET)
1060 goto out;
1061 break;
1062 default:
1063 ret = -EINVAL;
1064 goto out;
1065 }
1066
1067 rtnl_lock();
1068
1069 ret = -ENODEV;
1070 dev = __dev_get_by_name(net, ifr->ifr_name);
1071 if (!dev)
1072 goto done;
1073
1074 if (colon)
1075 *colon = ':';
1076
1077 in_dev = __in_dev_get_rtnl(dev);
1078 if (in_dev) {
1079 if (tryaddrmatch) {
1080 /* Matthias Andree */
1081 /* compare label and address (4.4BSD style) */
1082 /* note: we only do this for a limited set of ioctls
1083 and only if the original address family was AF_INET.
1084 This is checked above. */
1085
1086 for (ifap = &in_dev->ifa_list;
1087 (ifa = rtnl_dereference(*ifap)) != NULL;
1088 ifap = &ifa->ifa_next) {
1089 if (!strcmp(ifr->ifr_name, ifa->ifa_label) &&
1090 sin_orig.sin_addr.s_addr ==
1091 ifa->ifa_local) {
1092 break; /* found */
1093 }
1094 }
1095 }
1096 /* we didn't get a match, maybe the application is
1097 4.3BSD-style and passed in junk so we fall back to
1098 comparing just the label */
1099 if (!ifa) {
1100 for (ifap = &in_dev->ifa_list;
1101 (ifa = rtnl_dereference(*ifap)) != NULL;
1102 ifap = &ifa->ifa_next)
1103 if (!strcmp(ifr->ifr_name, ifa->ifa_label))
1104 break;
1105 }
1106 }
1107
1108 ret = -EADDRNOTAVAIL;
1109 if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS)
1110 goto done;
1111
1112 switch (cmd) {
1113 case SIOCGIFADDR: /* Get interface address */
1114 ret = 0;
1115 sin->sin_addr.s_addr = ifa->ifa_local;
1116 break;
1117
1118 case SIOCGIFBRDADDR: /* Get the broadcast address */
1119 ret = 0;
1120 sin->sin_addr.s_addr = ifa->ifa_broadcast;
1121 break;
1122
1123 case SIOCGIFDSTADDR: /* Get the destination address */
1124 ret = 0;
1125 sin->sin_addr.s_addr = ifa->ifa_address;
1126 break;
1127
1128 case SIOCGIFNETMASK: /* Get the netmask for the interface */
1129 ret = 0;
1130 sin->sin_addr.s_addr = ifa->ifa_mask;
1131 break;
1132
1133 case SIOCSIFFLAGS:
1134 if (colon) {
1135 ret = -EADDRNOTAVAIL;
1136 if (!ifa)
1137 break;
1138 ret = 0;
1139 if (!(ifr->ifr_flags & IFF_UP))
1140 inet_del_ifa(in_dev, ifap, 1);
1141 break;
1142 }
1143 ret = dev_change_flags(dev, ifr->ifr_flags, NULL);
1144 break;
1145
1146 case SIOCSIFADDR: /* Set interface address (and family) */
1147 ret = -EINVAL;
1148 if (inet_abc_len(sin->sin_addr.s_addr) < 0)
1149 break;
1150
1151 if (!ifa) {
1152 ret = -ENOBUFS;
1153 ifa = inet_alloc_ifa();
1154 if (!ifa)
1155 break;
1156 INIT_HLIST_NODE(&ifa->hash);
1157 if (colon)
1158 memcpy(ifa->ifa_label, ifr->ifr_name, IFNAMSIZ);
1159 else
1160 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1161 } else {
1162 ret = 0;
1163 if (ifa->ifa_local == sin->sin_addr.s_addr)
1164 break;
1165 inet_del_ifa(in_dev, ifap, 0);
1166 ifa->ifa_broadcast = 0;
1167 ifa->ifa_scope = 0;
1168 }
1169
1170 ifa->ifa_address = ifa->ifa_local = sin->sin_addr.s_addr;
1171
1172 if (!(dev->flags & IFF_POINTOPOINT)) {
1173 ifa->ifa_prefixlen = inet_abc_len(ifa->ifa_address);
1174 ifa->ifa_mask = inet_make_mask(ifa->ifa_prefixlen);
1175 if ((dev->flags & IFF_BROADCAST) &&
1176 ifa->ifa_prefixlen < 31)
1177 ifa->ifa_broadcast = ifa->ifa_address |
1178 ~ifa->ifa_mask;
1179 } else {
1180 ifa->ifa_prefixlen = 32;
1181 ifa->ifa_mask = inet_make_mask(32);
1182 }
1183 set_ifa_lifetime(ifa, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1184 ret = inet_set_ifa(dev, ifa);
1185 break;
1186
1187 case SIOCSIFBRDADDR: /* Set the broadcast address */
1188 ret = 0;
1189 if (ifa->ifa_broadcast != sin->sin_addr.s_addr) {
1190 inet_del_ifa(in_dev, ifap, 0);
1191 ifa->ifa_broadcast = sin->sin_addr.s_addr;
1192 inet_insert_ifa(ifa);
1193 }
1194 break;
1195
1196 case SIOCSIFDSTADDR: /* Set the destination address */
1197 ret = 0;
1198 if (ifa->ifa_address == sin->sin_addr.s_addr)
1199 break;
1200 ret = -EINVAL;
1201 if (inet_abc_len(sin->sin_addr.s_addr) < 0)
1202 break;
1203 ret = 0;
1204 inet_del_ifa(in_dev, ifap, 0);
1205 ifa->ifa_address = sin->sin_addr.s_addr;
1206 inet_insert_ifa(ifa);
1207 break;
1208
1209 case SIOCSIFNETMASK: /* Set the netmask for the interface */
1210
1211 /*
1212 * The mask we set must be legal.
1213 */
1214 ret = -EINVAL;
1215 if (bad_mask(sin->sin_addr.s_addr, 0))
1216 break;
1217 ret = 0;
1218 if (ifa->ifa_mask != sin->sin_addr.s_addr) {
1219 __be32 old_mask = ifa->ifa_mask;
1220 inet_del_ifa(in_dev, ifap, 0);
1221 ifa->ifa_mask = sin->sin_addr.s_addr;
1222 ifa->ifa_prefixlen = inet_mask_len(ifa->ifa_mask);
1223
1224 /* See if current broadcast address matches
1225 * with current netmask, then recalculate
1226 * the broadcast address. Otherwise it's a
1227 * funny address, so don't touch it since
1228 * the user seems to know what (s)he's doing...
1229 */
1230 if ((dev->flags & IFF_BROADCAST) &&
1231 (ifa->ifa_prefixlen < 31) &&
1232 (ifa->ifa_broadcast ==
1233 (ifa->ifa_local|~old_mask))) {
1234 ifa->ifa_broadcast = (ifa->ifa_local |
1235 ~sin->sin_addr.s_addr);
1236 }
1237 inet_insert_ifa(ifa);
1238 }
1239 break;
1240 }
1241done:
1242 rtnl_unlock();
1243out:
1244 return ret;
1245}
1246
1247static int inet_gifconf(struct net_device *dev, char __user *buf, int len, int size)
1248{
1249 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1250 const struct in_ifaddr *ifa;
1251 struct ifreq ifr;
1252 int done = 0;
1253
1254 if (WARN_ON(size > sizeof(struct ifreq)))
1255 goto out;
1256
1257 if (!in_dev)
1258 goto out;
1259
1260 in_dev_for_each_ifa_rtnl(ifa, in_dev) {
1261 if (!buf) {
1262 done += size;
1263 continue;
1264 }
1265 if (len < size)
1266 break;
1267 memset(&ifr, 0, sizeof(struct ifreq));
1268 strcpy(ifr.ifr_name, ifa->ifa_label);
1269
1270 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_family = AF_INET;
1271 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_addr.s_addr =
1272 ifa->ifa_local;
1273
1274 if (copy_to_user(buf + done, &ifr, size)) {
1275 done = -EFAULT;
1276 break;
1277 }
1278 len -= size;
1279 done += size;
1280 }
1281out:
1282 return done;
1283}
1284
1285static __be32 in_dev_select_addr(const struct in_device *in_dev,
1286 int scope)
1287{
1288 const struct in_ifaddr *ifa;
1289
1290 in_dev_for_each_ifa_rcu(ifa, in_dev) {
1291 if (ifa->ifa_flags & IFA_F_SECONDARY)
1292 continue;
1293 if (ifa->ifa_scope != RT_SCOPE_LINK &&
1294 ifa->ifa_scope <= scope)
1295 return ifa->ifa_local;
1296 }
1297
1298 return 0;
1299}
1300
1301__be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope)
1302{
1303 const struct in_ifaddr *ifa;
1304 __be32 addr = 0;
1305 unsigned char localnet_scope = RT_SCOPE_HOST;
1306 struct in_device *in_dev;
1307 struct net *net = dev_net(dev);
1308 int master_idx;
1309
1310 rcu_read_lock();
1311 in_dev = __in_dev_get_rcu(dev);
1312 if (!in_dev)
1313 goto no_in_dev;
1314
1315 if (unlikely(IN_DEV_ROUTE_LOCALNET(in_dev)))
1316 localnet_scope = RT_SCOPE_LINK;
1317
1318 in_dev_for_each_ifa_rcu(ifa, in_dev) {
1319 if (ifa->ifa_flags & IFA_F_SECONDARY)
1320 continue;
1321 if (min(ifa->ifa_scope, localnet_scope) > scope)
1322 continue;
1323 if (!dst || inet_ifa_match(dst, ifa)) {
1324 addr = ifa->ifa_local;
1325 break;
1326 }
1327 if (!addr)
1328 addr = ifa->ifa_local;
1329 }
1330
1331 if (addr)
1332 goto out_unlock;
1333no_in_dev:
1334 master_idx = l3mdev_master_ifindex_rcu(dev);
1335
1336 /* For VRFs, the VRF device takes the place of the loopback device,
1337 * with addresses on it being preferred. Note in such cases the
1338 * loopback device will be among the devices that fail the master_idx
1339 * equality check in the loop below.
1340 */
1341 if (master_idx &&
1342 (dev = dev_get_by_index_rcu(net, master_idx)) &&
1343 (in_dev = __in_dev_get_rcu(dev))) {
1344 addr = in_dev_select_addr(in_dev, scope);
1345 if (addr)
1346 goto out_unlock;
1347 }
1348
1349 /* Not loopback addresses on loopback should be preferred
1350 in this case. It is important that lo is the first interface
1351 in dev_base list.
1352 */
1353 for_each_netdev_rcu(net, dev) {
1354 if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1355 continue;
1356
1357 in_dev = __in_dev_get_rcu(dev);
1358 if (!in_dev)
1359 continue;
1360
1361 addr = in_dev_select_addr(in_dev, scope);
1362 if (addr)
1363 goto out_unlock;
1364 }
1365out_unlock:
1366 rcu_read_unlock();
1367 return addr;
1368}
1369EXPORT_SYMBOL(inet_select_addr);
1370
1371static __be32 confirm_addr_indev(struct in_device *in_dev, __be32 dst,
1372 __be32 local, int scope)
1373{
1374 unsigned char localnet_scope = RT_SCOPE_HOST;
1375 const struct in_ifaddr *ifa;
1376 __be32 addr = 0;
1377 int same = 0;
1378
1379 if (unlikely(IN_DEV_ROUTE_LOCALNET(in_dev)))
1380 localnet_scope = RT_SCOPE_LINK;
1381
1382 in_dev_for_each_ifa_rcu(ifa, in_dev) {
1383 unsigned char min_scope = min(ifa->ifa_scope, localnet_scope);
1384
1385 if (!addr &&
1386 (local == ifa->ifa_local || !local) &&
1387 min_scope <= scope) {
1388 addr = ifa->ifa_local;
1389 if (same)
1390 break;
1391 }
1392 if (!same) {
1393 same = (!local || inet_ifa_match(local, ifa)) &&
1394 (!dst || inet_ifa_match(dst, ifa));
1395 if (same && addr) {
1396 if (local || !dst)
1397 break;
1398 /* Is the selected addr into dst subnet? */
1399 if (inet_ifa_match(addr, ifa))
1400 break;
1401 /* No, then can we use new local src? */
1402 if (min_scope <= scope) {
1403 addr = ifa->ifa_local;
1404 break;
1405 }
1406 /* search for large dst subnet for addr */
1407 same = 0;
1408 }
1409 }
1410 }
1411
1412 return same ? addr : 0;
1413}
1414
1415/*
1416 * Confirm that local IP address exists using wildcards:
1417 * - net: netns to check, cannot be NULL
1418 * - in_dev: only on this interface, NULL=any interface
1419 * - dst: only in the same subnet as dst, 0=any dst
1420 * - local: address, 0=autoselect the local address
1421 * - scope: maximum allowed scope value for the local address
1422 */
1423__be32 inet_confirm_addr(struct net *net, struct in_device *in_dev,
1424 __be32 dst, __be32 local, int scope)
1425{
1426 __be32 addr = 0;
1427 struct net_device *dev;
1428
1429 if (in_dev)
1430 return confirm_addr_indev(in_dev, dst, local, scope);
1431
1432 rcu_read_lock();
1433 for_each_netdev_rcu(net, dev) {
1434 in_dev = __in_dev_get_rcu(dev);
1435 if (in_dev) {
1436 addr = confirm_addr_indev(in_dev, dst, local, scope);
1437 if (addr)
1438 break;
1439 }
1440 }
1441 rcu_read_unlock();
1442
1443 return addr;
1444}
1445EXPORT_SYMBOL(inet_confirm_addr);
1446
1447/*
1448 * Device notifier
1449 */
1450
1451int register_inetaddr_notifier(struct notifier_block *nb)
1452{
1453 return blocking_notifier_chain_register(&inetaddr_chain, nb);
1454}
1455EXPORT_SYMBOL(register_inetaddr_notifier);
1456
1457int unregister_inetaddr_notifier(struct notifier_block *nb)
1458{
1459 return blocking_notifier_chain_unregister(&inetaddr_chain, nb);
1460}
1461EXPORT_SYMBOL(unregister_inetaddr_notifier);
1462
1463int register_inetaddr_validator_notifier(struct notifier_block *nb)
1464{
1465 return blocking_notifier_chain_register(&inetaddr_validator_chain, nb);
1466}
1467EXPORT_SYMBOL(register_inetaddr_validator_notifier);
1468
1469int unregister_inetaddr_validator_notifier(struct notifier_block *nb)
1470{
1471 return blocking_notifier_chain_unregister(&inetaddr_validator_chain,
1472 nb);
1473}
1474EXPORT_SYMBOL(unregister_inetaddr_validator_notifier);
1475
1476/* Rename ifa_labels for a device name change. Make some effort to preserve
1477 * existing alias numbering and to create unique labels if possible.
1478*/
1479static void inetdev_changename(struct net_device *dev, struct in_device *in_dev)
1480{
1481 struct in_ifaddr *ifa;
1482 int named = 0;
1483
1484 in_dev_for_each_ifa_rtnl(ifa, in_dev) {
1485 char old[IFNAMSIZ], *dot;
1486
1487 memcpy(old, ifa->ifa_label, IFNAMSIZ);
1488 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1489 if (named++ == 0)
1490 goto skip;
1491 dot = strchr(old, ':');
1492 if (!dot) {
1493 sprintf(old, ":%d", named);
1494 dot = old;
1495 }
1496 if (strlen(dot) + strlen(dev->name) < IFNAMSIZ)
1497 strcat(ifa->ifa_label, dot);
1498 else
1499 strcpy(ifa->ifa_label + (IFNAMSIZ - strlen(dot) - 1), dot);
1500skip:
1501 rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0);
1502 }
1503}
1504
1505static void inetdev_send_gratuitous_arp(struct net_device *dev,
1506 struct in_device *in_dev)
1507
1508{
1509 const struct in_ifaddr *ifa;
1510
1511 in_dev_for_each_ifa_rtnl(ifa, in_dev) {
1512 arp_send(ARPOP_REQUEST, ETH_P_ARP,
1513 ifa->ifa_local, dev,
1514 ifa->ifa_local, NULL,
1515 dev->dev_addr, NULL);
1516 }
1517}
1518
1519/* Called only under RTNL semaphore */
1520
1521static int inetdev_event(struct notifier_block *this, unsigned long event,
1522 void *ptr)
1523{
1524 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1525 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1526
1527 ASSERT_RTNL();
1528
1529 if (!in_dev) {
1530 if (event == NETDEV_REGISTER) {
1531 in_dev = inetdev_init(dev);
1532 if (IS_ERR(in_dev))
1533 return notifier_from_errno(PTR_ERR(in_dev));
1534 if (dev->flags & IFF_LOOPBACK) {
1535 IN_DEV_CONF_SET(in_dev, NOXFRM, 1);
1536 IN_DEV_CONF_SET(in_dev, NOPOLICY, 1);
1537 }
1538 } else if (event == NETDEV_CHANGEMTU) {
1539 /* Re-enabling IP */
1540 if (inetdev_valid_mtu(dev->mtu))
1541 in_dev = inetdev_init(dev);
1542 }
1543 goto out;
1544 }
1545
1546 switch (event) {
1547 case NETDEV_REGISTER:
1548 pr_debug("%s: bug\n", __func__);
1549 RCU_INIT_POINTER(dev->ip_ptr, NULL);
1550 break;
1551 case NETDEV_UP:
1552 if (!inetdev_valid_mtu(dev->mtu))
1553 break;
1554 if (dev->flags & IFF_LOOPBACK) {
1555 struct in_ifaddr *ifa = inet_alloc_ifa();
1556
1557 if (ifa) {
1558 INIT_HLIST_NODE(&ifa->hash);
1559 ifa->ifa_local =
1560 ifa->ifa_address = htonl(INADDR_LOOPBACK);
1561 ifa->ifa_prefixlen = 8;
1562 ifa->ifa_mask = inet_make_mask(8);
1563 in_dev_hold(in_dev);
1564 ifa->ifa_dev = in_dev;
1565 ifa->ifa_scope = RT_SCOPE_HOST;
1566 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1567 set_ifa_lifetime(ifa, INFINITY_LIFE_TIME,
1568 INFINITY_LIFE_TIME);
1569 ipv4_devconf_setall(in_dev);
1570 neigh_parms_data_state_setall(in_dev->arp_parms);
1571 inet_insert_ifa(ifa);
1572 }
1573 }
1574 ip_mc_up(in_dev);
1575 fallthrough;
1576 case NETDEV_CHANGEADDR:
1577 if (!IN_DEV_ARP_NOTIFY(in_dev))
1578 break;
1579 fallthrough;
1580 case NETDEV_NOTIFY_PEERS:
1581 /* Send gratuitous ARP to notify of link change */
1582 inetdev_send_gratuitous_arp(dev, in_dev);
1583 break;
1584 case NETDEV_DOWN:
1585 ip_mc_down(in_dev);
1586 break;
1587 case NETDEV_PRE_TYPE_CHANGE:
1588 ip_mc_unmap(in_dev);
1589 break;
1590 case NETDEV_POST_TYPE_CHANGE:
1591 ip_mc_remap(in_dev);
1592 break;
1593 case NETDEV_CHANGEMTU:
1594 if (inetdev_valid_mtu(dev->mtu))
1595 break;
1596 /* disable IP when MTU is not enough */
1597 fallthrough;
1598 case NETDEV_UNREGISTER:
1599 inetdev_destroy(in_dev);
1600 break;
1601 case NETDEV_CHANGENAME:
1602 /* Do not notify about label change, this event is
1603 * not interesting to applications using netlink.
1604 */
1605 inetdev_changename(dev, in_dev);
1606
1607 devinet_sysctl_unregister(in_dev);
1608 devinet_sysctl_register(in_dev);
1609 break;
1610 }
1611out:
1612 return NOTIFY_DONE;
1613}
1614
1615static struct notifier_block ip_netdev_notifier = {
1616 .notifier_call = inetdev_event,
1617};
1618
1619static size_t inet_nlmsg_size(void)
1620{
1621 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
1622 + nla_total_size(4) /* IFA_ADDRESS */
1623 + nla_total_size(4) /* IFA_LOCAL */
1624 + nla_total_size(4) /* IFA_BROADCAST */
1625 + nla_total_size(IFNAMSIZ) /* IFA_LABEL */
1626 + nla_total_size(4) /* IFA_FLAGS */
1627 + nla_total_size(4) /* IFA_RT_PRIORITY */
1628 + nla_total_size(sizeof(struct ifa_cacheinfo)); /* IFA_CACHEINFO */
1629}
1630
1631static inline u32 cstamp_delta(unsigned long cstamp)
1632{
1633 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
1634}
1635
1636static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
1637 unsigned long tstamp, u32 preferred, u32 valid)
1638{
1639 struct ifa_cacheinfo ci;
1640
1641 ci.cstamp = cstamp_delta(cstamp);
1642 ci.tstamp = cstamp_delta(tstamp);
1643 ci.ifa_prefered = preferred;
1644 ci.ifa_valid = valid;
1645
1646 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
1647}
1648
1649static int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa,
1650 struct inet_fill_args *args)
1651{
1652 struct ifaddrmsg *ifm;
1653 struct nlmsghdr *nlh;
1654 u32 preferred, valid;
1655
1656 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, sizeof(*ifm),
1657 args->flags);
1658 if (!nlh)
1659 return -EMSGSIZE;
1660
1661 ifm = nlmsg_data(nlh);
1662 ifm->ifa_family = AF_INET;
1663 ifm->ifa_prefixlen = ifa->ifa_prefixlen;
1664 ifm->ifa_flags = ifa->ifa_flags;
1665 ifm->ifa_scope = ifa->ifa_scope;
1666 ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
1667
1668 if (args->netnsid >= 0 &&
1669 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid))
1670 goto nla_put_failure;
1671
1672 if (!(ifm->ifa_flags & IFA_F_PERMANENT)) {
1673 preferred = ifa->ifa_preferred_lft;
1674 valid = ifa->ifa_valid_lft;
1675 if (preferred != INFINITY_LIFE_TIME) {
1676 long tval = (jiffies - ifa->ifa_tstamp) / HZ;
1677
1678 if (preferred > tval)
1679 preferred -= tval;
1680 else
1681 preferred = 0;
1682 if (valid != INFINITY_LIFE_TIME) {
1683 if (valid > tval)
1684 valid -= tval;
1685 else
1686 valid = 0;
1687 }
1688 }
1689 } else {
1690 preferred = INFINITY_LIFE_TIME;
1691 valid = INFINITY_LIFE_TIME;
1692 }
1693 if ((ifa->ifa_address &&
1694 nla_put_in_addr(skb, IFA_ADDRESS, ifa->ifa_address)) ||
1695 (ifa->ifa_local &&
1696 nla_put_in_addr(skb, IFA_LOCAL, ifa->ifa_local)) ||
1697 (ifa->ifa_broadcast &&
1698 nla_put_in_addr(skb, IFA_BROADCAST, ifa->ifa_broadcast)) ||
1699 (ifa->ifa_label[0] &&
1700 nla_put_string(skb, IFA_LABEL, ifa->ifa_label)) ||
1701 nla_put_u32(skb, IFA_FLAGS, ifa->ifa_flags) ||
1702 (ifa->ifa_rt_priority &&
1703 nla_put_u32(skb, IFA_RT_PRIORITY, ifa->ifa_rt_priority)) ||
1704 put_cacheinfo(skb, ifa->ifa_cstamp, ifa->ifa_tstamp,
1705 preferred, valid))
1706 goto nla_put_failure;
1707
1708 nlmsg_end(skb, nlh);
1709 return 0;
1710
1711nla_put_failure:
1712 nlmsg_cancel(skb, nlh);
1713 return -EMSGSIZE;
1714}
1715
1716static int inet_valid_dump_ifaddr_req(const struct nlmsghdr *nlh,
1717 struct inet_fill_args *fillargs,
1718 struct net **tgt_net, struct sock *sk,
1719 struct netlink_callback *cb)
1720{
1721 struct netlink_ext_ack *extack = cb->extack;
1722 struct nlattr *tb[IFA_MAX+1];
1723 struct ifaddrmsg *ifm;
1724 int err, i;
1725
1726 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
1727 NL_SET_ERR_MSG(extack, "ipv4: Invalid header for address dump request");
1728 return -EINVAL;
1729 }
1730
1731 ifm = nlmsg_data(nlh);
1732 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
1733 NL_SET_ERR_MSG(extack, "ipv4: Invalid values in header for address dump request");
1734 return -EINVAL;
1735 }
1736
1737 fillargs->ifindex = ifm->ifa_index;
1738 if (fillargs->ifindex) {
1739 cb->answer_flags |= NLM_F_DUMP_FILTERED;
1740 fillargs->flags |= NLM_F_DUMP_FILTERED;
1741 }
1742
1743 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
1744 ifa_ipv4_policy, extack);
1745 if (err < 0)
1746 return err;
1747
1748 for (i = 0; i <= IFA_MAX; ++i) {
1749 if (!tb[i])
1750 continue;
1751
1752 if (i == IFA_TARGET_NETNSID) {
1753 struct net *net;
1754
1755 fillargs->netnsid = nla_get_s32(tb[i]);
1756
1757 net = rtnl_get_net_ns_capable(sk, fillargs->netnsid);
1758 if (IS_ERR(net)) {
1759 fillargs->netnsid = -1;
1760 NL_SET_ERR_MSG(extack, "ipv4: Invalid target network namespace id");
1761 return PTR_ERR(net);
1762 }
1763 *tgt_net = net;
1764 } else {
1765 NL_SET_ERR_MSG(extack, "ipv4: Unsupported attribute in dump request");
1766 return -EINVAL;
1767 }
1768 }
1769
1770 return 0;
1771}
1772
1773static int in_dev_dump_addr(struct in_device *in_dev, struct sk_buff *skb,
1774 struct netlink_callback *cb, int s_ip_idx,
1775 struct inet_fill_args *fillargs)
1776{
1777 struct in_ifaddr *ifa;
1778 int ip_idx = 0;
1779 int err;
1780
1781 in_dev_for_each_ifa_rtnl(ifa, in_dev) {
1782 if (ip_idx < s_ip_idx) {
1783 ip_idx++;
1784 continue;
1785 }
1786 err = inet_fill_ifaddr(skb, ifa, fillargs);
1787 if (err < 0)
1788 goto done;
1789
1790 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1791 ip_idx++;
1792 }
1793 err = 0;
1794
1795done:
1796 cb->args[2] = ip_idx;
1797
1798 return err;
1799}
1800
1801static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
1802{
1803 const struct nlmsghdr *nlh = cb->nlh;
1804 struct inet_fill_args fillargs = {
1805 .portid = NETLINK_CB(cb->skb).portid,
1806 .seq = nlh->nlmsg_seq,
1807 .event = RTM_NEWADDR,
1808 .flags = NLM_F_MULTI,
1809 .netnsid = -1,
1810 };
1811 struct net *net = sock_net(skb->sk);
1812 struct net *tgt_net = net;
1813 int h, s_h;
1814 int idx, s_idx;
1815 int s_ip_idx;
1816 struct net_device *dev;
1817 struct in_device *in_dev;
1818 struct hlist_head *head;
1819 int err = 0;
1820
1821 s_h = cb->args[0];
1822 s_idx = idx = cb->args[1];
1823 s_ip_idx = cb->args[2];
1824
1825 if (cb->strict_check) {
1826 err = inet_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net,
1827 skb->sk, cb);
1828 if (err < 0)
1829 goto put_tgt_net;
1830
1831 err = 0;
1832 if (fillargs.ifindex) {
1833 dev = __dev_get_by_index(tgt_net, fillargs.ifindex);
1834 if (!dev) {
1835 err = -ENODEV;
1836 goto put_tgt_net;
1837 }
1838
1839 in_dev = __in_dev_get_rtnl(dev);
1840 if (in_dev) {
1841 err = in_dev_dump_addr(in_dev, skb, cb, s_ip_idx,
1842 &fillargs);
1843 }
1844 goto put_tgt_net;
1845 }
1846 }
1847
1848 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1849 idx = 0;
1850 head = &tgt_net->dev_index_head[h];
1851 rcu_read_lock();
1852 cb->seq = atomic_read(&tgt_net->ipv4.dev_addr_genid) ^
1853 tgt_net->dev_base_seq;
1854 hlist_for_each_entry_rcu(dev, head, index_hlist) {
1855 if (idx < s_idx)
1856 goto cont;
1857 if (h > s_h || idx > s_idx)
1858 s_ip_idx = 0;
1859 in_dev = __in_dev_get_rcu(dev);
1860 if (!in_dev)
1861 goto cont;
1862
1863 err = in_dev_dump_addr(in_dev, skb, cb, s_ip_idx,
1864 &fillargs);
1865 if (err < 0) {
1866 rcu_read_unlock();
1867 goto done;
1868 }
1869cont:
1870 idx++;
1871 }
1872 rcu_read_unlock();
1873 }
1874
1875done:
1876 cb->args[0] = h;
1877 cb->args[1] = idx;
1878put_tgt_net:
1879 if (fillargs.netnsid >= 0)
1880 put_net(tgt_net);
1881
1882 return skb->len ? : err;
1883}
1884
1885static void rtmsg_ifa(int event, struct in_ifaddr *ifa, struct nlmsghdr *nlh,
1886 u32 portid)
1887{
1888 struct inet_fill_args fillargs = {
1889 .portid = portid,
1890 .seq = nlh ? nlh->nlmsg_seq : 0,
1891 .event = event,
1892 .flags = 0,
1893 .netnsid = -1,
1894 };
1895 struct sk_buff *skb;
1896 int err = -ENOBUFS;
1897 struct net *net;
1898
1899 net = dev_net(ifa->ifa_dev->dev);
1900 skb = nlmsg_new(inet_nlmsg_size(), GFP_KERNEL);
1901 if (!skb)
1902 goto errout;
1903
1904 err = inet_fill_ifaddr(skb, ifa, &fillargs);
1905 if (err < 0) {
1906 /* -EMSGSIZE implies BUG in inet_nlmsg_size() */
1907 WARN_ON(err == -EMSGSIZE);
1908 kfree_skb(skb);
1909 goto errout;
1910 }
1911 rtnl_notify(skb, net, portid, RTNLGRP_IPV4_IFADDR, nlh, GFP_KERNEL);
1912 return;
1913errout:
1914 if (err < 0)
1915 rtnl_set_sk_err(net, RTNLGRP_IPV4_IFADDR, err);
1916}
1917
1918static size_t inet_get_link_af_size(const struct net_device *dev,
1919 u32 ext_filter_mask)
1920{
1921 struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr);
1922
1923 if (!in_dev)
1924 return 0;
1925
1926 return nla_total_size(IPV4_DEVCONF_MAX * 4); /* IFLA_INET_CONF */
1927}
1928
1929static int inet_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
1930 u32 ext_filter_mask)
1931{
1932 struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr);
1933 struct nlattr *nla;
1934 int i;
1935
1936 if (!in_dev)
1937 return -ENODATA;
1938
1939 nla = nla_reserve(skb, IFLA_INET_CONF, IPV4_DEVCONF_MAX * 4);
1940 if (!nla)
1941 return -EMSGSIZE;
1942
1943 for (i = 0; i < IPV4_DEVCONF_MAX; i++)
1944 ((u32 *) nla_data(nla))[i] = in_dev->cnf.data[i];
1945
1946 return 0;
1947}
1948
1949static const struct nla_policy inet_af_policy[IFLA_INET_MAX+1] = {
1950 [IFLA_INET_CONF] = { .type = NLA_NESTED },
1951};
1952
1953static int inet_validate_link_af(const struct net_device *dev,
1954 const struct nlattr *nla)
1955{
1956 struct nlattr *a, *tb[IFLA_INET_MAX+1];
1957 int err, rem;
1958
1959 if (dev && !__in_dev_get_rcu(dev))
1960 return -EAFNOSUPPORT;
1961
1962 err = nla_parse_nested_deprecated(tb, IFLA_INET_MAX, nla,
1963 inet_af_policy, NULL);
1964 if (err < 0)
1965 return err;
1966
1967 if (tb[IFLA_INET_CONF]) {
1968 nla_for_each_nested(a, tb[IFLA_INET_CONF], rem) {
1969 int cfgid = nla_type(a);
1970
1971 if (nla_len(a) < 4)
1972 return -EINVAL;
1973
1974 if (cfgid <= 0 || cfgid > IPV4_DEVCONF_MAX)
1975 return -EINVAL;
1976 }
1977 }
1978
1979 return 0;
1980}
1981
1982static int inet_set_link_af(struct net_device *dev, const struct nlattr *nla)
1983{
1984 struct in_device *in_dev = __in_dev_get_rcu(dev);
1985 struct nlattr *a, *tb[IFLA_INET_MAX+1];
1986 int rem;
1987
1988 if (!in_dev)
1989 return -EAFNOSUPPORT;
1990
1991 if (nla_parse_nested_deprecated(tb, IFLA_INET_MAX, nla, NULL, NULL) < 0)
1992 BUG();
1993
1994 if (tb[IFLA_INET_CONF]) {
1995 nla_for_each_nested(a, tb[IFLA_INET_CONF], rem)
1996 ipv4_devconf_set(in_dev, nla_type(a), nla_get_u32(a));
1997 }
1998
1999 return 0;
2000}
2001
2002static int inet_netconf_msgsize_devconf(int type)
2003{
2004 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
2005 + nla_total_size(4); /* NETCONFA_IFINDEX */
2006 bool all = false;
2007
2008 if (type == NETCONFA_ALL)
2009 all = true;
2010
2011 if (all || type == NETCONFA_FORWARDING)
2012 size += nla_total_size(4);
2013 if (all || type == NETCONFA_RP_FILTER)
2014 size += nla_total_size(4);
2015 if (all || type == NETCONFA_MC_FORWARDING)
2016 size += nla_total_size(4);
2017 if (all || type == NETCONFA_BC_FORWARDING)
2018 size += nla_total_size(4);
2019 if (all || type == NETCONFA_PROXY_NEIGH)
2020 size += nla_total_size(4);
2021 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
2022 size += nla_total_size(4);
2023
2024 return size;
2025}
2026
2027static int inet_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
2028 struct ipv4_devconf *devconf, u32 portid,
2029 u32 seq, int event, unsigned int flags,
2030 int type)
2031{
2032 struct nlmsghdr *nlh;
2033 struct netconfmsg *ncm;
2034 bool all = false;
2035
2036 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
2037 flags);
2038 if (!nlh)
2039 return -EMSGSIZE;
2040
2041 if (type == NETCONFA_ALL)
2042 all = true;
2043
2044 ncm = nlmsg_data(nlh);
2045 ncm->ncm_family = AF_INET;
2046
2047 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
2048 goto nla_put_failure;
2049
2050 if (!devconf)
2051 goto out;
2052
2053 if ((all || type == NETCONFA_FORWARDING) &&
2054 nla_put_s32(skb, NETCONFA_FORWARDING,
2055 IPV4_DEVCONF(*devconf, FORWARDING)) < 0)
2056 goto nla_put_failure;
2057 if ((all || type == NETCONFA_RP_FILTER) &&
2058 nla_put_s32(skb, NETCONFA_RP_FILTER,
2059 IPV4_DEVCONF(*devconf, RP_FILTER)) < 0)
2060 goto nla_put_failure;
2061 if ((all || type == NETCONFA_MC_FORWARDING) &&
2062 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
2063 IPV4_DEVCONF(*devconf, MC_FORWARDING)) < 0)
2064 goto nla_put_failure;
2065 if ((all || type == NETCONFA_BC_FORWARDING) &&
2066 nla_put_s32(skb, NETCONFA_BC_FORWARDING,
2067 IPV4_DEVCONF(*devconf, BC_FORWARDING)) < 0)
2068 goto nla_put_failure;
2069 if ((all || type == NETCONFA_PROXY_NEIGH) &&
2070 nla_put_s32(skb, NETCONFA_PROXY_NEIGH,
2071 IPV4_DEVCONF(*devconf, PROXY_ARP)) < 0)
2072 goto nla_put_failure;
2073 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
2074 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
2075 IPV4_DEVCONF(*devconf, IGNORE_ROUTES_WITH_LINKDOWN)) < 0)
2076 goto nla_put_failure;
2077
2078out:
2079 nlmsg_end(skb, nlh);
2080 return 0;
2081
2082nla_put_failure:
2083 nlmsg_cancel(skb, nlh);
2084 return -EMSGSIZE;
2085}
2086
2087void inet_netconf_notify_devconf(struct net *net, int event, int type,
2088 int ifindex, struct ipv4_devconf *devconf)
2089{
2090 struct sk_buff *skb;
2091 int err = -ENOBUFS;
2092
2093 skb = nlmsg_new(inet_netconf_msgsize_devconf(type), GFP_KERNEL);
2094 if (!skb)
2095 goto errout;
2096
2097 err = inet_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
2098 event, 0, type);
2099 if (err < 0) {
2100 /* -EMSGSIZE implies BUG in inet_netconf_msgsize_devconf() */
2101 WARN_ON(err == -EMSGSIZE);
2102 kfree_skb(skb);
2103 goto errout;
2104 }
2105 rtnl_notify(skb, net, 0, RTNLGRP_IPV4_NETCONF, NULL, GFP_KERNEL);
2106 return;
2107errout:
2108 if (err < 0)
2109 rtnl_set_sk_err(net, RTNLGRP_IPV4_NETCONF, err);
2110}
2111
2112static const struct nla_policy devconf_ipv4_policy[NETCONFA_MAX+1] = {
2113 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
2114 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
2115 [NETCONFA_RP_FILTER] = { .len = sizeof(int) },
2116 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
2117 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
2118};
2119
2120static int inet_netconf_valid_get_req(struct sk_buff *skb,
2121 const struct nlmsghdr *nlh,
2122 struct nlattr **tb,
2123 struct netlink_ext_ack *extack)
2124{
2125 int i, err;
2126
2127 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) {
2128 NL_SET_ERR_MSG(extack, "ipv4: Invalid header for netconf get request");
2129 return -EINVAL;
2130 }
2131
2132 if (!netlink_strict_get_check(skb))
2133 return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg),
2134 tb, NETCONFA_MAX,
2135 devconf_ipv4_policy, extack);
2136
2137 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg),
2138 tb, NETCONFA_MAX,
2139 devconf_ipv4_policy, extack);
2140 if (err)
2141 return err;
2142
2143 for (i = 0; i <= NETCONFA_MAX; i++) {
2144 if (!tb[i])
2145 continue;
2146
2147 switch (i) {
2148 case NETCONFA_IFINDEX:
2149 break;
2150 default:
2151 NL_SET_ERR_MSG(extack, "ipv4: Unsupported attribute in netconf get request");
2152 return -EINVAL;
2153 }
2154 }
2155
2156 return 0;
2157}
2158
2159static int inet_netconf_get_devconf(struct sk_buff *in_skb,
2160 struct nlmsghdr *nlh,
2161 struct netlink_ext_ack *extack)
2162{
2163 struct net *net = sock_net(in_skb->sk);
2164 struct nlattr *tb[NETCONFA_MAX+1];
2165 struct sk_buff *skb;
2166 struct ipv4_devconf *devconf;
2167 struct in_device *in_dev;
2168 struct net_device *dev;
2169 int ifindex;
2170 int err;
2171
2172 err = inet_netconf_valid_get_req(in_skb, nlh, tb, extack);
2173 if (err)
2174 goto errout;
2175
2176 err = -EINVAL;
2177 if (!tb[NETCONFA_IFINDEX])
2178 goto errout;
2179
2180 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
2181 switch (ifindex) {
2182 case NETCONFA_IFINDEX_ALL:
2183 devconf = net->ipv4.devconf_all;
2184 break;
2185 case NETCONFA_IFINDEX_DEFAULT:
2186 devconf = net->ipv4.devconf_dflt;
2187 break;
2188 default:
2189 dev = __dev_get_by_index(net, ifindex);
2190 if (!dev)
2191 goto errout;
2192 in_dev = __in_dev_get_rtnl(dev);
2193 if (!in_dev)
2194 goto errout;
2195 devconf = &in_dev->cnf;
2196 break;
2197 }
2198
2199 err = -ENOBUFS;
2200 skb = nlmsg_new(inet_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL);
2201 if (!skb)
2202 goto errout;
2203
2204 err = inet_netconf_fill_devconf(skb, ifindex, devconf,
2205 NETLINK_CB(in_skb).portid,
2206 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
2207 NETCONFA_ALL);
2208 if (err < 0) {
2209 /* -EMSGSIZE implies BUG in inet_netconf_msgsize_devconf() */
2210 WARN_ON(err == -EMSGSIZE);
2211 kfree_skb(skb);
2212 goto errout;
2213 }
2214 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
2215errout:
2216 return err;
2217}
2218
2219static int inet_netconf_dump_devconf(struct sk_buff *skb,
2220 struct netlink_callback *cb)
2221{
2222 const struct nlmsghdr *nlh = cb->nlh;
2223 struct net *net = sock_net(skb->sk);
2224 int h, s_h;
2225 int idx, s_idx;
2226 struct net_device *dev;
2227 struct in_device *in_dev;
2228 struct hlist_head *head;
2229
2230 if (cb->strict_check) {
2231 struct netlink_ext_ack *extack = cb->extack;
2232 struct netconfmsg *ncm;
2233
2234 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) {
2235 NL_SET_ERR_MSG(extack, "ipv4: Invalid header for netconf dump request");
2236 return -EINVAL;
2237 }
2238
2239 if (nlmsg_attrlen(nlh, sizeof(*ncm))) {
2240 NL_SET_ERR_MSG(extack, "ipv4: Invalid data after header in netconf dump request");
2241 return -EINVAL;
2242 }
2243 }
2244
2245 s_h = cb->args[0];
2246 s_idx = idx = cb->args[1];
2247
2248 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
2249 idx = 0;
2250 head = &net->dev_index_head[h];
2251 rcu_read_lock();
2252 cb->seq = atomic_read(&net->ipv4.dev_addr_genid) ^
2253 net->dev_base_seq;
2254 hlist_for_each_entry_rcu(dev, head, index_hlist) {
2255 if (idx < s_idx)
2256 goto cont;
2257 in_dev = __in_dev_get_rcu(dev);
2258 if (!in_dev)
2259 goto cont;
2260
2261 if (inet_netconf_fill_devconf(skb, dev->ifindex,
2262 &in_dev->cnf,
2263 NETLINK_CB(cb->skb).portid,
2264 nlh->nlmsg_seq,
2265 RTM_NEWNETCONF,
2266 NLM_F_MULTI,
2267 NETCONFA_ALL) < 0) {
2268 rcu_read_unlock();
2269 goto done;
2270 }
2271 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2272cont:
2273 idx++;
2274 }
2275 rcu_read_unlock();
2276 }
2277 if (h == NETDEV_HASHENTRIES) {
2278 if (inet_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
2279 net->ipv4.devconf_all,
2280 NETLINK_CB(cb->skb).portid,
2281 nlh->nlmsg_seq,
2282 RTM_NEWNETCONF, NLM_F_MULTI,
2283 NETCONFA_ALL) < 0)
2284 goto done;
2285 else
2286 h++;
2287 }
2288 if (h == NETDEV_HASHENTRIES + 1) {
2289 if (inet_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
2290 net->ipv4.devconf_dflt,
2291 NETLINK_CB(cb->skb).portid,
2292 nlh->nlmsg_seq,
2293 RTM_NEWNETCONF, NLM_F_MULTI,
2294 NETCONFA_ALL) < 0)
2295 goto done;
2296 else
2297 h++;
2298 }
2299done:
2300 cb->args[0] = h;
2301 cb->args[1] = idx;
2302
2303 return skb->len;
2304}
2305
2306#ifdef CONFIG_SYSCTL
2307
2308static void devinet_copy_dflt_conf(struct net *net, int i)
2309{
2310 struct net_device *dev;
2311
2312 rcu_read_lock();
2313 for_each_netdev_rcu(net, dev) {
2314 struct in_device *in_dev;
2315
2316 in_dev = __in_dev_get_rcu(dev);
2317 if (in_dev && !test_bit(i, in_dev->cnf.state))
2318 in_dev->cnf.data[i] = net->ipv4.devconf_dflt->data[i];
2319 }
2320 rcu_read_unlock();
2321}
2322
2323/* called with RTNL locked */
2324static void inet_forward_change(struct net *net)
2325{
2326 struct net_device *dev;
2327 int on = IPV4_DEVCONF_ALL(net, FORWARDING);
2328
2329 IPV4_DEVCONF_ALL(net, ACCEPT_REDIRECTS) = !on;
2330 IPV4_DEVCONF_DFLT(net, FORWARDING) = on;
2331 inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
2332 NETCONFA_FORWARDING,
2333 NETCONFA_IFINDEX_ALL,
2334 net->ipv4.devconf_all);
2335 inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
2336 NETCONFA_FORWARDING,
2337 NETCONFA_IFINDEX_DEFAULT,
2338 net->ipv4.devconf_dflt);
2339
2340 for_each_netdev(net, dev) {
2341 struct in_device *in_dev;
2342
2343 if (on)
2344 dev_disable_lro(dev);
2345
2346 in_dev = __in_dev_get_rtnl(dev);
2347 if (in_dev) {
2348 IN_DEV_CONF_SET(in_dev, FORWARDING, on);
2349 inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
2350 NETCONFA_FORWARDING,
2351 dev->ifindex, &in_dev->cnf);
2352 }
2353 }
2354}
2355
2356static int devinet_conf_ifindex(struct net *net, struct ipv4_devconf *cnf)
2357{
2358 if (cnf == net->ipv4.devconf_dflt)
2359 return NETCONFA_IFINDEX_DEFAULT;
2360 else if (cnf == net->ipv4.devconf_all)
2361 return NETCONFA_IFINDEX_ALL;
2362 else {
2363 struct in_device *idev
2364 = container_of(cnf, struct in_device, cnf);
2365 return idev->dev->ifindex;
2366 }
2367}
2368
2369static int devinet_conf_proc(struct ctl_table *ctl, int write,
2370 void *buffer, size_t *lenp, loff_t *ppos)
2371{
2372 int old_value = *(int *)ctl->data;
2373 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
2374 int new_value = *(int *)ctl->data;
2375
2376 if (write) {
2377 struct ipv4_devconf *cnf = ctl->extra1;
2378 struct net *net = ctl->extra2;
2379 int i = (int *)ctl->data - cnf->data;
2380 int ifindex;
2381
2382 set_bit(i, cnf->state);
2383
2384 if (cnf == net->ipv4.devconf_dflt)
2385 devinet_copy_dflt_conf(net, i);
2386 if (i == IPV4_DEVCONF_ACCEPT_LOCAL - 1 ||
2387 i == IPV4_DEVCONF_ROUTE_LOCALNET - 1)
2388 if ((new_value == 0) && (old_value != 0))
2389 rt_cache_flush(net);
2390
2391 if (i == IPV4_DEVCONF_BC_FORWARDING - 1 &&
2392 new_value != old_value)
2393 rt_cache_flush(net);
2394
2395 if (i == IPV4_DEVCONF_RP_FILTER - 1 &&
2396 new_value != old_value) {
2397 ifindex = devinet_conf_ifindex(net, cnf);
2398 inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
2399 NETCONFA_RP_FILTER,
2400 ifindex, cnf);
2401 }
2402 if (i == IPV4_DEVCONF_PROXY_ARP - 1 &&
2403 new_value != old_value) {
2404 ifindex = devinet_conf_ifindex(net, cnf);
2405 inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
2406 NETCONFA_PROXY_NEIGH,
2407 ifindex, cnf);
2408 }
2409 if (i == IPV4_DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN - 1 &&
2410 new_value != old_value) {
2411 ifindex = devinet_conf_ifindex(net, cnf);
2412 inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
2413 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
2414 ifindex, cnf);
2415 }
2416 }
2417
2418 return ret;
2419}
2420
2421static int devinet_sysctl_forward(struct ctl_table *ctl, int write,
2422 void *buffer, size_t *lenp, loff_t *ppos)
2423{
2424 int *valp = ctl->data;
2425 int val = *valp;
2426 loff_t pos = *ppos;
2427 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
2428
2429 if (write && *valp != val) {
2430 struct net *net = ctl->extra2;
2431
2432 if (valp != &IPV4_DEVCONF_DFLT(net, FORWARDING)) {
2433 if (!rtnl_trylock()) {
2434 /* Restore the original values before restarting */
2435 *valp = val;
2436 *ppos = pos;
2437 return restart_syscall();
2438 }
2439 if (valp == &IPV4_DEVCONF_ALL(net, FORWARDING)) {
2440 inet_forward_change(net);
2441 } else {
2442 struct ipv4_devconf *cnf = ctl->extra1;
2443 struct in_device *idev =
2444 container_of(cnf, struct in_device, cnf);
2445 if (*valp)
2446 dev_disable_lro(idev->dev);
2447 inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
2448 NETCONFA_FORWARDING,
2449 idev->dev->ifindex,
2450 cnf);
2451 }
2452 rtnl_unlock();
2453 rt_cache_flush(net);
2454 } else
2455 inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
2456 NETCONFA_FORWARDING,
2457 NETCONFA_IFINDEX_DEFAULT,
2458 net->ipv4.devconf_dflt);
2459 }
2460
2461 return ret;
2462}
2463
2464static int ipv4_doint_and_flush(struct ctl_table *ctl, int write,
2465 void *buffer, size_t *lenp, loff_t *ppos)
2466{
2467 int *valp = ctl->data;
2468 int val = *valp;
2469 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
2470 struct net *net = ctl->extra2;
2471
2472 if (write && *valp != val)
2473 rt_cache_flush(net);
2474
2475 return ret;
2476}
2477
2478#define DEVINET_SYSCTL_ENTRY(attr, name, mval, proc) \
2479 { \
2480 .procname = name, \
2481 .data = ipv4_devconf.data + \
2482 IPV4_DEVCONF_ ## attr - 1, \
2483 .maxlen = sizeof(int), \
2484 .mode = mval, \
2485 .proc_handler = proc, \
2486 .extra1 = &ipv4_devconf, \
2487 }
2488
2489#define DEVINET_SYSCTL_RW_ENTRY(attr, name) \
2490 DEVINET_SYSCTL_ENTRY(attr, name, 0644, devinet_conf_proc)
2491
2492#define DEVINET_SYSCTL_RO_ENTRY(attr, name) \
2493 DEVINET_SYSCTL_ENTRY(attr, name, 0444, devinet_conf_proc)
2494
2495#define DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, proc) \
2496 DEVINET_SYSCTL_ENTRY(attr, name, 0644, proc)
2497
2498#define DEVINET_SYSCTL_FLUSHING_ENTRY(attr, name) \
2499 DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, ipv4_doint_and_flush)
2500
2501static struct devinet_sysctl_table {
2502 struct ctl_table_header *sysctl_header;
2503 struct ctl_table devinet_vars[__IPV4_DEVCONF_MAX];
2504} devinet_sysctl = {
2505 .devinet_vars = {
2506 DEVINET_SYSCTL_COMPLEX_ENTRY(FORWARDING, "forwarding",
2507 devinet_sysctl_forward),
2508 DEVINET_SYSCTL_RO_ENTRY(MC_FORWARDING, "mc_forwarding"),
2509 DEVINET_SYSCTL_RW_ENTRY(BC_FORWARDING, "bc_forwarding"),
2510
2511 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_REDIRECTS, "accept_redirects"),
2512 DEVINET_SYSCTL_RW_ENTRY(SECURE_REDIRECTS, "secure_redirects"),
2513 DEVINET_SYSCTL_RW_ENTRY(SHARED_MEDIA, "shared_media"),
2514 DEVINET_SYSCTL_RW_ENTRY(RP_FILTER, "rp_filter"),
2515 DEVINET_SYSCTL_RW_ENTRY(SEND_REDIRECTS, "send_redirects"),
2516 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_SOURCE_ROUTE,
2517 "accept_source_route"),
2518 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_LOCAL, "accept_local"),
2519 DEVINET_SYSCTL_RW_ENTRY(SRC_VMARK, "src_valid_mark"),
2520 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP, "proxy_arp"),
2521 DEVINET_SYSCTL_RW_ENTRY(MEDIUM_ID, "medium_id"),
2522 DEVINET_SYSCTL_RW_ENTRY(BOOTP_RELAY, "bootp_relay"),
2523 DEVINET_SYSCTL_RW_ENTRY(LOG_MARTIANS, "log_martians"),
2524 DEVINET_SYSCTL_RW_ENTRY(TAG, "tag"),
2525 DEVINET_SYSCTL_RW_ENTRY(ARPFILTER, "arp_filter"),
2526 DEVINET_SYSCTL_RW_ENTRY(ARP_ANNOUNCE, "arp_announce"),
2527 DEVINET_SYSCTL_RW_ENTRY(ARP_IGNORE, "arp_ignore"),
2528 DEVINET_SYSCTL_RW_ENTRY(ARP_ACCEPT, "arp_accept"),
2529 DEVINET_SYSCTL_RW_ENTRY(ARP_NOTIFY, "arp_notify"),
2530 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP_PVLAN, "proxy_arp_pvlan"),
2531 DEVINET_SYSCTL_RW_ENTRY(FORCE_IGMP_VERSION,
2532 "force_igmp_version"),
2533 DEVINET_SYSCTL_RW_ENTRY(IGMPV2_UNSOLICITED_REPORT_INTERVAL,
2534 "igmpv2_unsolicited_report_interval"),
2535 DEVINET_SYSCTL_RW_ENTRY(IGMPV3_UNSOLICITED_REPORT_INTERVAL,
2536 "igmpv3_unsolicited_report_interval"),
2537 DEVINET_SYSCTL_RW_ENTRY(IGNORE_ROUTES_WITH_LINKDOWN,
2538 "ignore_routes_with_linkdown"),
2539 DEVINET_SYSCTL_RW_ENTRY(DROP_GRATUITOUS_ARP,
2540 "drop_gratuitous_arp"),
2541
2542 DEVINET_SYSCTL_FLUSHING_ENTRY(NOXFRM, "disable_xfrm"),
2543 DEVINET_SYSCTL_FLUSHING_ENTRY(NOPOLICY, "disable_policy"),
2544 DEVINET_SYSCTL_FLUSHING_ENTRY(PROMOTE_SECONDARIES,
2545 "promote_secondaries"),
2546 DEVINET_SYSCTL_FLUSHING_ENTRY(ROUTE_LOCALNET,
2547 "route_localnet"),
2548 DEVINET_SYSCTL_FLUSHING_ENTRY(DROP_UNICAST_IN_L2_MULTICAST,
2549 "drop_unicast_in_l2_multicast"),
2550 },
2551};
2552
2553static int __devinet_sysctl_register(struct net *net, char *dev_name,
2554 int ifindex, struct ipv4_devconf *p)
2555{
2556 int i;
2557 struct devinet_sysctl_table *t;
2558 char path[sizeof("net/ipv4/conf/") + IFNAMSIZ];
2559
2560 t = kmemdup(&devinet_sysctl, sizeof(*t), GFP_KERNEL);
2561 if (!t)
2562 goto out;
2563
2564 for (i = 0; i < ARRAY_SIZE(t->devinet_vars) - 1; i++) {
2565 t->devinet_vars[i].data += (char *)p - (char *)&ipv4_devconf;
2566 t->devinet_vars[i].extra1 = p;
2567 t->devinet_vars[i].extra2 = net;
2568 }
2569
2570 snprintf(path, sizeof(path), "net/ipv4/conf/%s", dev_name);
2571
2572 t->sysctl_header = register_net_sysctl(net, path, t->devinet_vars);
2573 if (!t->sysctl_header)
2574 goto free;
2575
2576 p->sysctl = t;
2577
2578 inet_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
2579 ifindex, p);
2580 return 0;
2581
2582free:
2583 kfree(t);
2584out:
2585 return -ENOBUFS;
2586}
2587
2588static void __devinet_sysctl_unregister(struct net *net,
2589 struct ipv4_devconf *cnf, int ifindex)
2590{
2591 struct devinet_sysctl_table *t = cnf->sysctl;
2592
2593 if (t) {
2594 cnf->sysctl = NULL;
2595 unregister_net_sysctl_table(t->sysctl_header);
2596 kfree(t);
2597 }
2598
2599 inet_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
2600}
2601
2602static int devinet_sysctl_register(struct in_device *idev)
2603{
2604 int err;
2605
2606 if (!sysctl_dev_name_is_allowed(idev->dev->name))
2607 return -EINVAL;
2608
2609 err = neigh_sysctl_register(idev->dev, idev->arp_parms, NULL);
2610 if (err)
2611 return err;
2612 err = __devinet_sysctl_register(dev_net(idev->dev), idev->dev->name,
2613 idev->dev->ifindex, &idev->cnf);
2614 if (err)
2615 neigh_sysctl_unregister(idev->arp_parms);
2616 return err;
2617}
2618
2619static void devinet_sysctl_unregister(struct in_device *idev)
2620{
2621 struct net *net = dev_net(idev->dev);
2622
2623 __devinet_sysctl_unregister(net, &idev->cnf, idev->dev->ifindex);
2624 neigh_sysctl_unregister(idev->arp_parms);
2625}
2626
2627static struct ctl_table ctl_forward_entry[] = {
2628 {
2629 .procname = "ip_forward",
2630 .data = &ipv4_devconf.data[
2631 IPV4_DEVCONF_FORWARDING - 1],
2632 .maxlen = sizeof(int),
2633 .mode = 0644,
2634 .proc_handler = devinet_sysctl_forward,
2635 .extra1 = &ipv4_devconf,
2636 .extra2 = &init_net,
2637 },
2638 { },
2639};
2640#endif
2641
2642static __net_init int devinet_init_net(struct net *net)
2643{
2644 int err;
2645 struct ipv4_devconf *all, *dflt;
2646#ifdef CONFIG_SYSCTL
2647 struct ctl_table *tbl;
2648 struct ctl_table_header *forw_hdr;
2649#endif
2650
2651 err = -ENOMEM;
2652 all = kmemdup(&ipv4_devconf, sizeof(ipv4_devconf), GFP_KERNEL);
2653 if (!all)
2654 goto err_alloc_all;
2655
2656 dflt = kmemdup(&ipv4_devconf_dflt, sizeof(ipv4_devconf_dflt), GFP_KERNEL);
2657 if (!dflt)
2658 goto err_alloc_dflt;
2659
2660#ifdef CONFIG_SYSCTL
2661 tbl = kmemdup(ctl_forward_entry, sizeof(ctl_forward_entry), GFP_KERNEL);
2662 if (!tbl)
2663 goto err_alloc_ctl;
2664
2665 tbl[0].data = &all->data[IPV4_DEVCONF_FORWARDING - 1];
2666 tbl[0].extra1 = all;
2667 tbl[0].extra2 = net;
2668#endif
2669
2670 if (!net_eq(net, &init_net)) {
2671 if (IS_ENABLED(CONFIG_SYSCTL) &&
2672 sysctl_devconf_inherit_init_net == 3) {
2673 /* copy from the current netns */
2674 memcpy(all, current->nsproxy->net_ns->ipv4.devconf_all,
2675 sizeof(ipv4_devconf));
2676 memcpy(dflt,
2677 current->nsproxy->net_ns->ipv4.devconf_dflt,
2678 sizeof(ipv4_devconf_dflt));
2679 } else if (!IS_ENABLED(CONFIG_SYSCTL) ||
2680 sysctl_devconf_inherit_init_net != 2) {
2681 /* inherit == 0 or 1: copy from init_net */
2682 memcpy(all, init_net.ipv4.devconf_all,
2683 sizeof(ipv4_devconf));
2684 memcpy(dflt, init_net.ipv4.devconf_dflt,
2685 sizeof(ipv4_devconf_dflt));
2686 }
2687 /* else inherit == 2: use compiled values */
2688 }
2689
2690#ifdef CONFIG_SYSCTL
2691 err = __devinet_sysctl_register(net, "all", NETCONFA_IFINDEX_ALL, all);
2692 if (err < 0)
2693 goto err_reg_all;
2694
2695 err = __devinet_sysctl_register(net, "default",
2696 NETCONFA_IFINDEX_DEFAULT, dflt);
2697 if (err < 0)
2698 goto err_reg_dflt;
2699
2700 err = -ENOMEM;
2701 forw_hdr = register_net_sysctl(net, "net/ipv4", tbl);
2702 if (!forw_hdr)
2703 goto err_reg_ctl;
2704 net->ipv4.forw_hdr = forw_hdr;
2705#endif
2706
2707 net->ipv4.devconf_all = all;
2708 net->ipv4.devconf_dflt = dflt;
2709 return 0;
2710
2711#ifdef CONFIG_SYSCTL
2712err_reg_ctl:
2713 __devinet_sysctl_unregister(net, dflt, NETCONFA_IFINDEX_DEFAULT);
2714err_reg_dflt:
2715 __devinet_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL);
2716err_reg_all:
2717 kfree(tbl);
2718err_alloc_ctl:
2719#endif
2720 kfree(dflt);
2721err_alloc_dflt:
2722 kfree(all);
2723err_alloc_all:
2724 return err;
2725}
2726
2727static __net_exit void devinet_exit_net(struct net *net)
2728{
2729#ifdef CONFIG_SYSCTL
2730 struct ctl_table *tbl;
2731
2732 tbl = net->ipv4.forw_hdr->ctl_table_arg;
2733 unregister_net_sysctl_table(net->ipv4.forw_hdr);
2734 __devinet_sysctl_unregister(net, net->ipv4.devconf_dflt,
2735 NETCONFA_IFINDEX_DEFAULT);
2736 __devinet_sysctl_unregister(net, net->ipv4.devconf_all,
2737 NETCONFA_IFINDEX_ALL);
2738 kfree(tbl);
2739#endif
2740 kfree(net->ipv4.devconf_dflt);
2741 kfree(net->ipv4.devconf_all);
2742}
2743
2744static __net_initdata struct pernet_operations devinet_ops = {
2745 .init = devinet_init_net,
2746 .exit = devinet_exit_net,
2747};
2748
2749static struct rtnl_af_ops inet_af_ops __read_mostly = {
2750 .family = AF_INET,
2751 .fill_link_af = inet_fill_link_af,
2752 .get_link_af_size = inet_get_link_af_size,
2753 .validate_link_af = inet_validate_link_af,
2754 .set_link_af = inet_set_link_af,
2755};
2756
2757void __init devinet_init(void)
2758{
2759 int i;
2760
2761 for (i = 0; i < IN4_ADDR_HSIZE; i++)
2762 INIT_HLIST_HEAD(&inet_addr_lst[i]);
2763
2764 register_pernet_subsys(&devinet_ops);
2765
2766 register_gifconf(PF_INET, inet_gifconf);
2767 register_netdevice_notifier(&ip_netdev_notifier);
2768
2769 queue_delayed_work(system_power_efficient_wq, &check_lifetime_work, 0);
2770
2771 rtnl_af_register(&inet_af_ops);
2772
2773 rtnl_register(PF_INET, RTM_NEWADDR, inet_rtm_newaddr, NULL, 0);
2774 rtnl_register(PF_INET, RTM_DELADDR, inet_rtm_deladdr, NULL, 0);
2775 rtnl_register(PF_INET, RTM_GETADDR, NULL, inet_dump_ifaddr, 0);
2776 rtnl_register(PF_INET, RTM_GETNETCONF, inet_netconf_get_devconf,
2777 inet_netconf_dump_devconf, 0);
2778}
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * NET3 IP device support routines.
4 *
5 * Derived from the IP parts of dev.c 1.0.19
6 * Authors: Ross Biro
7 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
8 * Mark Evans, <evansmp@uhura.aston.ac.uk>
9 *
10 * Additional Authors:
11 * Alan Cox, <gw4pts@gw4pts.ampr.org>
12 * Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
13 *
14 * Changes:
15 * Alexey Kuznetsov: pa_* fields are replaced with ifaddr
16 * lists.
17 * Cyrus Durgin: updated for kmod
18 * Matthias Andree: in devinet_ioctl, compare label and
19 * address (4.4BSD alias style support),
20 * fall back to comparing just the label
21 * if no match found.
22 */
23
24
25#include <linux/uaccess.h>
26#include <linux/bitops.h>
27#include <linux/capability.h>
28#include <linux/module.h>
29#include <linux/types.h>
30#include <linux/kernel.h>
31#include <linux/sched/signal.h>
32#include <linux/string.h>
33#include <linux/mm.h>
34#include <linux/socket.h>
35#include <linux/sockios.h>
36#include <linux/in.h>
37#include <linux/errno.h>
38#include <linux/interrupt.h>
39#include <linux/if_addr.h>
40#include <linux/if_ether.h>
41#include <linux/inet.h>
42#include <linux/netdevice.h>
43#include <linux/etherdevice.h>
44#include <linux/skbuff.h>
45#include <linux/init.h>
46#include <linux/notifier.h>
47#include <linux/inetdevice.h>
48#include <linux/igmp.h>
49#include <linux/slab.h>
50#include <linux/hash.h>
51#ifdef CONFIG_SYSCTL
52#include <linux/sysctl.h>
53#endif
54#include <linux/kmod.h>
55#include <linux/netconf.h>
56
57#include <net/arp.h>
58#include <net/ip.h>
59#include <net/route.h>
60#include <net/ip_fib.h>
61#include <net/rtnetlink.h>
62#include <net/net_namespace.h>
63#include <net/addrconf.h>
64
65#define IPV6ONLY_FLAGS \
66 (IFA_F_NODAD | IFA_F_OPTIMISTIC | IFA_F_DADFAILED | \
67 IFA_F_HOMEADDRESS | IFA_F_TENTATIVE | \
68 IFA_F_MANAGETEMPADDR | IFA_F_STABLE_PRIVACY)
69
70static struct ipv4_devconf ipv4_devconf = {
71 .data = {
72 [IPV4_DEVCONF_ACCEPT_REDIRECTS - 1] = 1,
73 [IPV4_DEVCONF_SEND_REDIRECTS - 1] = 1,
74 [IPV4_DEVCONF_SECURE_REDIRECTS - 1] = 1,
75 [IPV4_DEVCONF_SHARED_MEDIA - 1] = 1,
76 [IPV4_DEVCONF_IGMPV2_UNSOLICITED_REPORT_INTERVAL - 1] = 10000 /*ms*/,
77 [IPV4_DEVCONF_IGMPV3_UNSOLICITED_REPORT_INTERVAL - 1] = 1000 /*ms*/,
78 [IPV4_DEVCONF_ARP_EVICT_NOCARRIER - 1] = 1,
79 },
80};
81
82static struct ipv4_devconf ipv4_devconf_dflt = {
83 .data = {
84 [IPV4_DEVCONF_ACCEPT_REDIRECTS - 1] = 1,
85 [IPV4_DEVCONF_SEND_REDIRECTS - 1] = 1,
86 [IPV4_DEVCONF_SECURE_REDIRECTS - 1] = 1,
87 [IPV4_DEVCONF_SHARED_MEDIA - 1] = 1,
88 [IPV4_DEVCONF_ACCEPT_SOURCE_ROUTE - 1] = 1,
89 [IPV4_DEVCONF_IGMPV2_UNSOLICITED_REPORT_INTERVAL - 1] = 10000 /*ms*/,
90 [IPV4_DEVCONF_IGMPV3_UNSOLICITED_REPORT_INTERVAL - 1] = 1000 /*ms*/,
91 [IPV4_DEVCONF_ARP_EVICT_NOCARRIER - 1] = 1,
92 },
93};
94
95#define IPV4_DEVCONF_DFLT(net, attr) \
96 IPV4_DEVCONF((*net->ipv4.devconf_dflt), attr)
97
98static const struct nla_policy ifa_ipv4_policy[IFA_MAX+1] = {
99 [IFA_LOCAL] = { .type = NLA_U32 },
100 [IFA_ADDRESS] = { .type = NLA_U32 },
101 [IFA_BROADCAST] = { .type = NLA_U32 },
102 [IFA_LABEL] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 },
103 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
104 [IFA_FLAGS] = { .type = NLA_U32 },
105 [IFA_RT_PRIORITY] = { .type = NLA_U32 },
106 [IFA_TARGET_NETNSID] = { .type = NLA_S32 },
107 [IFA_PROTO] = { .type = NLA_U8 },
108};
109
110struct inet_fill_args {
111 u32 portid;
112 u32 seq;
113 int event;
114 unsigned int flags;
115 int netnsid;
116 int ifindex;
117};
118
119#define IN4_ADDR_HSIZE_SHIFT 8
120#define IN4_ADDR_HSIZE (1U << IN4_ADDR_HSIZE_SHIFT)
121
122static struct hlist_head inet_addr_lst[IN4_ADDR_HSIZE];
123
124static u32 inet_addr_hash(const struct net *net, __be32 addr)
125{
126 u32 val = (__force u32) addr ^ net_hash_mix(net);
127
128 return hash_32(val, IN4_ADDR_HSIZE_SHIFT);
129}
130
131static void inet_hash_insert(struct net *net, struct in_ifaddr *ifa)
132{
133 u32 hash = inet_addr_hash(net, ifa->ifa_local);
134
135 ASSERT_RTNL();
136 hlist_add_head_rcu(&ifa->hash, &inet_addr_lst[hash]);
137}
138
139static void inet_hash_remove(struct in_ifaddr *ifa)
140{
141 ASSERT_RTNL();
142 hlist_del_init_rcu(&ifa->hash);
143}
144
145/**
146 * __ip_dev_find - find the first device with a given source address.
147 * @net: the net namespace
148 * @addr: the source address
149 * @devref: if true, take a reference on the found device
150 *
151 * If a caller uses devref=false, it should be protected by RCU, or RTNL
152 */
153struct net_device *__ip_dev_find(struct net *net, __be32 addr, bool devref)
154{
155 struct net_device *result = NULL;
156 struct in_ifaddr *ifa;
157
158 rcu_read_lock();
159 ifa = inet_lookup_ifaddr_rcu(net, addr);
160 if (!ifa) {
161 struct flowi4 fl4 = { .daddr = addr };
162 struct fib_result res = { 0 };
163 struct fib_table *local;
164
165 /* Fallback to FIB local table so that communication
166 * over loopback subnets work.
167 */
168 local = fib_get_table(net, RT_TABLE_LOCAL);
169 if (local &&
170 !fib_table_lookup(local, &fl4, &res, FIB_LOOKUP_NOREF) &&
171 res.type == RTN_LOCAL)
172 result = FIB_RES_DEV(res);
173 } else {
174 result = ifa->ifa_dev->dev;
175 }
176 if (result && devref)
177 dev_hold(result);
178 rcu_read_unlock();
179 return result;
180}
181EXPORT_SYMBOL(__ip_dev_find);
182
183/* called under RCU lock */
184struct in_ifaddr *inet_lookup_ifaddr_rcu(struct net *net, __be32 addr)
185{
186 u32 hash = inet_addr_hash(net, addr);
187 struct in_ifaddr *ifa;
188
189 hlist_for_each_entry_rcu(ifa, &inet_addr_lst[hash], hash)
190 if (ifa->ifa_local == addr &&
191 net_eq(dev_net(ifa->ifa_dev->dev), net))
192 return ifa;
193
194 return NULL;
195}
196
197static void rtmsg_ifa(int event, struct in_ifaddr *, struct nlmsghdr *, u32);
198
199static BLOCKING_NOTIFIER_HEAD(inetaddr_chain);
200static BLOCKING_NOTIFIER_HEAD(inetaddr_validator_chain);
201static void inet_del_ifa(struct in_device *in_dev,
202 struct in_ifaddr __rcu **ifap,
203 int destroy);
204#ifdef CONFIG_SYSCTL
205static int devinet_sysctl_register(struct in_device *idev);
206static void devinet_sysctl_unregister(struct in_device *idev);
207#else
208static int devinet_sysctl_register(struct in_device *idev)
209{
210 return 0;
211}
212static void devinet_sysctl_unregister(struct in_device *idev)
213{
214}
215#endif
216
217/* Locks all the inet devices. */
218
219static struct in_ifaddr *inet_alloc_ifa(void)
220{
221 return kzalloc(sizeof(struct in_ifaddr), GFP_KERNEL_ACCOUNT);
222}
223
224static void inet_rcu_free_ifa(struct rcu_head *head)
225{
226 struct in_ifaddr *ifa = container_of(head, struct in_ifaddr, rcu_head);
227 if (ifa->ifa_dev)
228 in_dev_put(ifa->ifa_dev);
229 kfree(ifa);
230}
231
232static void inet_free_ifa(struct in_ifaddr *ifa)
233{
234 call_rcu(&ifa->rcu_head, inet_rcu_free_ifa);
235}
236
237static void in_dev_free_rcu(struct rcu_head *head)
238{
239 struct in_device *idev = container_of(head, struct in_device, rcu_head);
240
241 kfree(rcu_dereference_protected(idev->mc_hash, 1));
242 kfree(idev);
243}
244
245void in_dev_finish_destroy(struct in_device *idev)
246{
247 struct net_device *dev = idev->dev;
248
249 WARN_ON(idev->ifa_list);
250 WARN_ON(idev->mc_list);
251#ifdef NET_REFCNT_DEBUG
252 pr_debug("%s: %p=%s\n", __func__, idev, dev ? dev->name : "NIL");
253#endif
254 netdev_put(dev, &idev->dev_tracker);
255 if (!idev->dead)
256 pr_err("Freeing alive in_device %p\n", idev);
257 else
258 call_rcu(&idev->rcu_head, in_dev_free_rcu);
259}
260EXPORT_SYMBOL(in_dev_finish_destroy);
261
262static struct in_device *inetdev_init(struct net_device *dev)
263{
264 struct in_device *in_dev;
265 int err = -ENOMEM;
266
267 ASSERT_RTNL();
268
269 in_dev = kzalloc(sizeof(*in_dev), GFP_KERNEL);
270 if (!in_dev)
271 goto out;
272 memcpy(&in_dev->cnf, dev_net(dev)->ipv4.devconf_dflt,
273 sizeof(in_dev->cnf));
274 in_dev->cnf.sysctl = NULL;
275 in_dev->dev = dev;
276 in_dev->arp_parms = neigh_parms_alloc(dev, &arp_tbl);
277 if (!in_dev->arp_parms)
278 goto out_kfree;
279 if (IPV4_DEVCONF(in_dev->cnf, FORWARDING))
280 dev_disable_lro(dev);
281 /* Reference in_dev->dev */
282 netdev_hold(dev, &in_dev->dev_tracker, GFP_KERNEL);
283 /* Account for reference dev->ip_ptr (below) */
284 refcount_set(&in_dev->refcnt, 1);
285
286 err = devinet_sysctl_register(in_dev);
287 if (err) {
288 in_dev->dead = 1;
289 neigh_parms_release(&arp_tbl, in_dev->arp_parms);
290 in_dev_put(in_dev);
291 in_dev = NULL;
292 goto out;
293 }
294 ip_mc_init_dev(in_dev);
295 if (dev->flags & IFF_UP)
296 ip_mc_up(in_dev);
297
298 /* we can receive as soon as ip_ptr is set -- do this last */
299 rcu_assign_pointer(dev->ip_ptr, in_dev);
300out:
301 return in_dev ?: ERR_PTR(err);
302out_kfree:
303 kfree(in_dev);
304 in_dev = NULL;
305 goto out;
306}
307
308static void inetdev_destroy(struct in_device *in_dev)
309{
310 struct net_device *dev;
311 struct in_ifaddr *ifa;
312
313 ASSERT_RTNL();
314
315 dev = in_dev->dev;
316
317 in_dev->dead = 1;
318
319 ip_mc_destroy_dev(in_dev);
320
321 while ((ifa = rtnl_dereference(in_dev->ifa_list)) != NULL) {
322 inet_del_ifa(in_dev, &in_dev->ifa_list, 0);
323 inet_free_ifa(ifa);
324 }
325
326 RCU_INIT_POINTER(dev->ip_ptr, NULL);
327
328 devinet_sysctl_unregister(in_dev);
329 neigh_parms_release(&arp_tbl, in_dev->arp_parms);
330 arp_ifdown(dev);
331
332 in_dev_put(in_dev);
333}
334
335int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b)
336{
337 const struct in_ifaddr *ifa;
338
339 rcu_read_lock();
340 in_dev_for_each_ifa_rcu(ifa, in_dev) {
341 if (inet_ifa_match(a, ifa)) {
342 if (!b || inet_ifa_match(b, ifa)) {
343 rcu_read_unlock();
344 return 1;
345 }
346 }
347 }
348 rcu_read_unlock();
349 return 0;
350}
351
352static void __inet_del_ifa(struct in_device *in_dev,
353 struct in_ifaddr __rcu **ifap,
354 int destroy, struct nlmsghdr *nlh, u32 portid)
355{
356 struct in_ifaddr *promote = NULL;
357 struct in_ifaddr *ifa, *ifa1;
358 struct in_ifaddr __rcu **last_prim;
359 struct in_ifaddr *prev_prom = NULL;
360 int do_promote = IN_DEV_PROMOTE_SECONDARIES(in_dev);
361
362 ASSERT_RTNL();
363
364 ifa1 = rtnl_dereference(*ifap);
365 last_prim = ifap;
366 if (in_dev->dead)
367 goto no_promotions;
368
369 /* 1. Deleting primary ifaddr forces deletion all secondaries
370 * unless alias promotion is set
371 **/
372
373 if (!(ifa1->ifa_flags & IFA_F_SECONDARY)) {
374 struct in_ifaddr __rcu **ifap1 = &ifa1->ifa_next;
375
376 while ((ifa = rtnl_dereference(*ifap1)) != NULL) {
377 if (!(ifa->ifa_flags & IFA_F_SECONDARY) &&
378 ifa1->ifa_scope <= ifa->ifa_scope)
379 last_prim = &ifa->ifa_next;
380
381 if (!(ifa->ifa_flags & IFA_F_SECONDARY) ||
382 ifa1->ifa_mask != ifa->ifa_mask ||
383 !inet_ifa_match(ifa1->ifa_address, ifa)) {
384 ifap1 = &ifa->ifa_next;
385 prev_prom = ifa;
386 continue;
387 }
388
389 if (!do_promote) {
390 inet_hash_remove(ifa);
391 *ifap1 = ifa->ifa_next;
392
393 rtmsg_ifa(RTM_DELADDR, ifa, nlh, portid);
394 blocking_notifier_call_chain(&inetaddr_chain,
395 NETDEV_DOWN, ifa);
396 inet_free_ifa(ifa);
397 } else {
398 promote = ifa;
399 break;
400 }
401 }
402 }
403
404 /* On promotion all secondaries from subnet are changing
405 * the primary IP, we must remove all their routes silently
406 * and later to add them back with new prefsrc. Do this
407 * while all addresses are on the device list.
408 */
409 for (ifa = promote; ifa; ifa = rtnl_dereference(ifa->ifa_next)) {
410 if (ifa1->ifa_mask == ifa->ifa_mask &&
411 inet_ifa_match(ifa1->ifa_address, ifa))
412 fib_del_ifaddr(ifa, ifa1);
413 }
414
415no_promotions:
416 /* 2. Unlink it */
417
418 *ifap = ifa1->ifa_next;
419 inet_hash_remove(ifa1);
420
421 /* 3. Announce address deletion */
422
423 /* Send message first, then call notifier.
424 At first sight, FIB update triggered by notifier
425 will refer to already deleted ifaddr, that could confuse
426 netlink listeners. It is not true: look, gated sees
427 that route deleted and if it still thinks that ifaddr
428 is valid, it will try to restore deleted routes... Grr.
429 So that, this order is correct.
430 */
431 rtmsg_ifa(RTM_DELADDR, ifa1, nlh, portid);
432 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa1);
433
434 if (promote) {
435 struct in_ifaddr *next_sec;
436
437 next_sec = rtnl_dereference(promote->ifa_next);
438 if (prev_prom) {
439 struct in_ifaddr *last_sec;
440
441 rcu_assign_pointer(prev_prom->ifa_next, next_sec);
442
443 last_sec = rtnl_dereference(*last_prim);
444 rcu_assign_pointer(promote->ifa_next, last_sec);
445 rcu_assign_pointer(*last_prim, promote);
446 }
447
448 promote->ifa_flags &= ~IFA_F_SECONDARY;
449 rtmsg_ifa(RTM_NEWADDR, promote, nlh, portid);
450 blocking_notifier_call_chain(&inetaddr_chain,
451 NETDEV_UP, promote);
452 for (ifa = next_sec; ifa;
453 ifa = rtnl_dereference(ifa->ifa_next)) {
454 if (ifa1->ifa_mask != ifa->ifa_mask ||
455 !inet_ifa_match(ifa1->ifa_address, ifa))
456 continue;
457 fib_add_ifaddr(ifa);
458 }
459
460 }
461 if (destroy)
462 inet_free_ifa(ifa1);
463}
464
465static void inet_del_ifa(struct in_device *in_dev,
466 struct in_ifaddr __rcu **ifap,
467 int destroy)
468{
469 __inet_del_ifa(in_dev, ifap, destroy, NULL, 0);
470}
471
472static void check_lifetime(struct work_struct *work);
473
474static DECLARE_DELAYED_WORK(check_lifetime_work, check_lifetime);
475
476static int __inet_insert_ifa(struct in_ifaddr *ifa, struct nlmsghdr *nlh,
477 u32 portid, struct netlink_ext_ack *extack)
478{
479 struct in_ifaddr __rcu **last_primary, **ifap;
480 struct in_device *in_dev = ifa->ifa_dev;
481 struct in_validator_info ivi;
482 struct in_ifaddr *ifa1;
483 int ret;
484
485 ASSERT_RTNL();
486
487 if (!ifa->ifa_local) {
488 inet_free_ifa(ifa);
489 return 0;
490 }
491
492 ifa->ifa_flags &= ~IFA_F_SECONDARY;
493 last_primary = &in_dev->ifa_list;
494
495 /* Don't set IPv6 only flags to IPv4 addresses */
496 ifa->ifa_flags &= ~IPV6ONLY_FLAGS;
497
498 ifap = &in_dev->ifa_list;
499 ifa1 = rtnl_dereference(*ifap);
500
501 while (ifa1) {
502 if (!(ifa1->ifa_flags & IFA_F_SECONDARY) &&
503 ifa->ifa_scope <= ifa1->ifa_scope)
504 last_primary = &ifa1->ifa_next;
505 if (ifa1->ifa_mask == ifa->ifa_mask &&
506 inet_ifa_match(ifa1->ifa_address, ifa)) {
507 if (ifa1->ifa_local == ifa->ifa_local) {
508 inet_free_ifa(ifa);
509 return -EEXIST;
510 }
511 if (ifa1->ifa_scope != ifa->ifa_scope) {
512 NL_SET_ERR_MSG(extack, "ipv4: Invalid scope value");
513 inet_free_ifa(ifa);
514 return -EINVAL;
515 }
516 ifa->ifa_flags |= IFA_F_SECONDARY;
517 }
518
519 ifap = &ifa1->ifa_next;
520 ifa1 = rtnl_dereference(*ifap);
521 }
522
523 /* Allow any devices that wish to register ifaddr validtors to weigh
524 * in now, before changes are committed. The rntl lock is serializing
525 * access here, so the state should not change between a validator call
526 * and a final notify on commit. This isn't invoked on promotion under
527 * the assumption that validators are checking the address itself, and
528 * not the flags.
529 */
530 ivi.ivi_addr = ifa->ifa_address;
531 ivi.ivi_dev = ifa->ifa_dev;
532 ivi.extack = extack;
533 ret = blocking_notifier_call_chain(&inetaddr_validator_chain,
534 NETDEV_UP, &ivi);
535 ret = notifier_to_errno(ret);
536 if (ret) {
537 inet_free_ifa(ifa);
538 return ret;
539 }
540
541 if (!(ifa->ifa_flags & IFA_F_SECONDARY))
542 ifap = last_primary;
543
544 rcu_assign_pointer(ifa->ifa_next, *ifap);
545 rcu_assign_pointer(*ifap, ifa);
546
547 inet_hash_insert(dev_net(in_dev->dev), ifa);
548
549 cancel_delayed_work(&check_lifetime_work);
550 queue_delayed_work(system_power_efficient_wq, &check_lifetime_work, 0);
551
552 /* Send message first, then call notifier.
553 Notifier will trigger FIB update, so that
554 listeners of netlink will know about new ifaddr */
555 rtmsg_ifa(RTM_NEWADDR, ifa, nlh, portid);
556 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa);
557
558 return 0;
559}
560
561static int inet_insert_ifa(struct in_ifaddr *ifa)
562{
563 return __inet_insert_ifa(ifa, NULL, 0, NULL);
564}
565
566static int inet_set_ifa(struct net_device *dev, struct in_ifaddr *ifa)
567{
568 struct in_device *in_dev = __in_dev_get_rtnl(dev);
569
570 ASSERT_RTNL();
571
572 if (!in_dev) {
573 inet_free_ifa(ifa);
574 return -ENOBUFS;
575 }
576 ipv4_devconf_setall(in_dev);
577 neigh_parms_data_state_setall(in_dev->arp_parms);
578 if (ifa->ifa_dev != in_dev) {
579 WARN_ON(ifa->ifa_dev);
580 in_dev_hold(in_dev);
581 ifa->ifa_dev = in_dev;
582 }
583 if (ipv4_is_loopback(ifa->ifa_local))
584 ifa->ifa_scope = RT_SCOPE_HOST;
585 return inet_insert_ifa(ifa);
586}
587
588/* Caller must hold RCU or RTNL :
589 * We dont take a reference on found in_device
590 */
591struct in_device *inetdev_by_index(struct net *net, int ifindex)
592{
593 struct net_device *dev;
594 struct in_device *in_dev = NULL;
595
596 rcu_read_lock();
597 dev = dev_get_by_index_rcu(net, ifindex);
598 if (dev)
599 in_dev = rcu_dereference_rtnl(dev->ip_ptr);
600 rcu_read_unlock();
601 return in_dev;
602}
603EXPORT_SYMBOL(inetdev_by_index);
604
605/* Called only from RTNL semaphored context. No locks. */
606
607struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix,
608 __be32 mask)
609{
610 struct in_ifaddr *ifa;
611
612 ASSERT_RTNL();
613
614 in_dev_for_each_ifa_rtnl(ifa, in_dev) {
615 if (ifa->ifa_mask == mask && inet_ifa_match(prefix, ifa))
616 return ifa;
617 }
618 return NULL;
619}
620
621static int ip_mc_autojoin_config(struct net *net, bool join,
622 const struct in_ifaddr *ifa)
623{
624#if defined(CONFIG_IP_MULTICAST)
625 struct ip_mreqn mreq = {
626 .imr_multiaddr.s_addr = ifa->ifa_address,
627 .imr_ifindex = ifa->ifa_dev->dev->ifindex,
628 };
629 struct sock *sk = net->ipv4.mc_autojoin_sk;
630 int ret;
631
632 ASSERT_RTNL();
633
634 lock_sock(sk);
635 if (join)
636 ret = ip_mc_join_group(sk, &mreq);
637 else
638 ret = ip_mc_leave_group(sk, &mreq);
639 release_sock(sk);
640
641 return ret;
642#else
643 return -EOPNOTSUPP;
644#endif
645}
646
647static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
648 struct netlink_ext_ack *extack)
649{
650 struct net *net = sock_net(skb->sk);
651 struct in_ifaddr __rcu **ifap;
652 struct nlattr *tb[IFA_MAX+1];
653 struct in_device *in_dev;
654 struct ifaddrmsg *ifm;
655 struct in_ifaddr *ifa;
656 int err;
657
658 ASSERT_RTNL();
659
660 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
661 ifa_ipv4_policy, extack);
662 if (err < 0)
663 goto errout;
664
665 ifm = nlmsg_data(nlh);
666 in_dev = inetdev_by_index(net, ifm->ifa_index);
667 if (!in_dev) {
668 NL_SET_ERR_MSG(extack, "ipv4: Device not found");
669 err = -ENODEV;
670 goto errout;
671 }
672
673 for (ifap = &in_dev->ifa_list; (ifa = rtnl_dereference(*ifap)) != NULL;
674 ifap = &ifa->ifa_next) {
675 if (tb[IFA_LOCAL] &&
676 ifa->ifa_local != nla_get_in_addr(tb[IFA_LOCAL]))
677 continue;
678
679 if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label))
680 continue;
681
682 if (tb[IFA_ADDRESS] &&
683 (ifm->ifa_prefixlen != ifa->ifa_prefixlen ||
684 !inet_ifa_match(nla_get_in_addr(tb[IFA_ADDRESS]), ifa)))
685 continue;
686
687 if (ipv4_is_multicast(ifa->ifa_address))
688 ip_mc_autojoin_config(net, false, ifa);
689 __inet_del_ifa(in_dev, ifap, 1, nlh, NETLINK_CB(skb).portid);
690 return 0;
691 }
692
693 NL_SET_ERR_MSG(extack, "ipv4: Address not found");
694 err = -EADDRNOTAVAIL;
695errout:
696 return err;
697}
698
699#define INFINITY_LIFE_TIME 0xFFFFFFFF
700
701static void check_lifetime(struct work_struct *work)
702{
703 unsigned long now, next, next_sec, next_sched;
704 struct in_ifaddr *ifa;
705 struct hlist_node *n;
706 int i;
707
708 now = jiffies;
709 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
710
711 for (i = 0; i < IN4_ADDR_HSIZE; i++) {
712 bool change_needed = false;
713
714 rcu_read_lock();
715 hlist_for_each_entry_rcu(ifa, &inet_addr_lst[i], hash) {
716 unsigned long age, tstamp;
717 u32 preferred_lft;
718 u32 valid_lft;
719 u32 flags;
720
721 flags = READ_ONCE(ifa->ifa_flags);
722 if (flags & IFA_F_PERMANENT)
723 continue;
724
725 preferred_lft = READ_ONCE(ifa->ifa_preferred_lft);
726 valid_lft = READ_ONCE(ifa->ifa_valid_lft);
727 tstamp = READ_ONCE(ifa->ifa_tstamp);
728 /* We try to batch several events at once. */
729 age = (now - tstamp +
730 ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
731
732 if (valid_lft != INFINITY_LIFE_TIME &&
733 age >= valid_lft) {
734 change_needed = true;
735 } else if (preferred_lft ==
736 INFINITY_LIFE_TIME) {
737 continue;
738 } else if (age >= preferred_lft) {
739 if (time_before(tstamp + valid_lft * HZ, next))
740 next = tstamp + valid_lft * HZ;
741
742 if (!(flags & IFA_F_DEPRECATED))
743 change_needed = true;
744 } else if (time_before(tstamp + preferred_lft * HZ,
745 next)) {
746 next = tstamp + preferred_lft * HZ;
747 }
748 }
749 rcu_read_unlock();
750 if (!change_needed)
751 continue;
752 rtnl_lock();
753 hlist_for_each_entry_safe(ifa, n, &inet_addr_lst[i], hash) {
754 unsigned long age;
755
756 if (ifa->ifa_flags & IFA_F_PERMANENT)
757 continue;
758
759 /* We try to batch several events at once. */
760 age = (now - ifa->ifa_tstamp +
761 ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
762
763 if (ifa->ifa_valid_lft != INFINITY_LIFE_TIME &&
764 age >= ifa->ifa_valid_lft) {
765 struct in_ifaddr __rcu **ifap;
766 struct in_ifaddr *tmp;
767
768 ifap = &ifa->ifa_dev->ifa_list;
769 tmp = rtnl_dereference(*ifap);
770 while (tmp) {
771 if (tmp == ifa) {
772 inet_del_ifa(ifa->ifa_dev,
773 ifap, 1);
774 break;
775 }
776 ifap = &tmp->ifa_next;
777 tmp = rtnl_dereference(*ifap);
778 }
779 } else if (ifa->ifa_preferred_lft !=
780 INFINITY_LIFE_TIME &&
781 age >= ifa->ifa_preferred_lft &&
782 !(ifa->ifa_flags & IFA_F_DEPRECATED)) {
783 ifa->ifa_flags |= IFA_F_DEPRECATED;
784 rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0);
785 }
786 }
787 rtnl_unlock();
788 }
789
790 next_sec = round_jiffies_up(next);
791 next_sched = next;
792
793 /* If rounded timeout is accurate enough, accept it. */
794 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
795 next_sched = next_sec;
796
797 now = jiffies;
798 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
799 if (time_before(next_sched, now + ADDRCONF_TIMER_FUZZ_MAX))
800 next_sched = now + ADDRCONF_TIMER_FUZZ_MAX;
801
802 queue_delayed_work(system_power_efficient_wq, &check_lifetime_work,
803 next_sched - now);
804}
805
806static void set_ifa_lifetime(struct in_ifaddr *ifa, __u32 valid_lft,
807 __u32 prefered_lft)
808{
809 unsigned long timeout;
810 u32 flags;
811
812 flags = ifa->ifa_flags & ~(IFA_F_PERMANENT | IFA_F_DEPRECATED);
813
814 timeout = addrconf_timeout_fixup(valid_lft, HZ);
815 if (addrconf_finite_timeout(timeout))
816 WRITE_ONCE(ifa->ifa_valid_lft, timeout);
817 else
818 flags |= IFA_F_PERMANENT;
819
820 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
821 if (addrconf_finite_timeout(timeout)) {
822 if (timeout == 0)
823 flags |= IFA_F_DEPRECATED;
824 WRITE_ONCE(ifa->ifa_preferred_lft, timeout);
825 }
826 WRITE_ONCE(ifa->ifa_flags, flags);
827 WRITE_ONCE(ifa->ifa_tstamp, jiffies);
828 if (!ifa->ifa_cstamp)
829 WRITE_ONCE(ifa->ifa_cstamp, ifa->ifa_tstamp);
830}
831
832static struct in_ifaddr *rtm_to_ifaddr(struct net *net, struct nlmsghdr *nlh,
833 __u32 *pvalid_lft, __u32 *pprefered_lft,
834 struct netlink_ext_ack *extack)
835{
836 struct nlattr *tb[IFA_MAX+1];
837 struct in_ifaddr *ifa;
838 struct ifaddrmsg *ifm;
839 struct net_device *dev;
840 struct in_device *in_dev;
841 int err;
842
843 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
844 ifa_ipv4_policy, extack);
845 if (err < 0)
846 goto errout;
847
848 ifm = nlmsg_data(nlh);
849 err = -EINVAL;
850
851 if (ifm->ifa_prefixlen > 32) {
852 NL_SET_ERR_MSG(extack, "ipv4: Invalid prefix length");
853 goto errout;
854 }
855
856 if (!tb[IFA_LOCAL]) {
857 NL_SET_ERR_MSG(extack, "ipv4: Local address is not supplied");
858 goto errout;
859 }
860
861 dev = __dev_get_by_index(net, ifm->ifa_index);
862 err = -ENODEV;
863 if (!dev) {
864 NL_SET_ERR_MSG(extack, "ipv4: Device not found");
865 goto errout;
866 }
867
868 in_dev = __in_dev_get_rtnl(dev);
869 err = -ENOBUFS;
870 if (!in_dev)
871 goto errout;
872
873 ifa = inet_alloc_ifa();
874 if (!ifa)
875 /*
876 * A potential indev allocation can be left alive, it stays
877 * assigned to its device and is destroy with it.
878 */
879 goto errout;
880
881 ipv4_devconf_setall(in_dev);
882 neigh_parms_data_state_setall(in_dev->arp_parms);
883 in_dev_hold(in_dev);
884
885 if (!tb[IFA_ADDRESS])
886 tb[IFA_ADDRESS] = tb[IFA_LOCAL];
887
888 INIT_HLIST_NODE(&ifa->hash);
889 ifa->ifa_prefixlen = ifm->ifa_prefixlen;
890 ifa->ifa_mask = inet_make_mask(ifm->ifa_prefixlen);
891 ifa->ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) :
892 ifm->ifa_flags;
893 ifa->ifa_scope = ifm->ifa_scope;
894 ifa->ifa_dev = in_dev;
895
896 ifa->ifa_local = nla_get_in_addr(tb[IFA_LOCAL]);
897 ifa->ifa_address = nla_get_in_addr(tb[IFA_ADDRESS]);
898
899 if (tb[IFA_BROADCAST])
900 ifa->ifa_broadcast = nla_get_in_addr(tb[IFA_BROADCAST]);
901
902 if (tb[IFA_LABEL])
903 nla_strscpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ);
904 else
905 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
906
907 if (tb[IFA_RT_PRIORITY])
908 ifa->ifa_rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]);
909
910 if (tb[IFA_PROTO])
911 ifa->ifa_proto = nla_get_u8(tb[IFA_PROTO]);
912
913 if (tb[IFA_CACHEINFO]) {
914 struct ifa_cacheinfo *ci;
915
916 ci = nla_data(tb[IFA_CACHEINFO]);
917 if (!ci->ifa_valid || ci->ifa_prefered > ci->ifa_valid) {
918 NL_SET_ERR_MSG(extack, "ipv4: address lifetime invalid");
919 err = -EINVAL;
920 goto errout_free;
921 }
922 *pvalid_lft = ci->ifa_valid;
923 *pprefered_lft = ci->ifa_prefered;
924 }
925
926 return ifa;
927
928errout_free:
929 inet_free_ifa(ifa);
930errout:
931 return ERR_PTR(err);
932}
933
934static struct in_ifaddr *find_matching_ifa(struct in_ifaddr *ifa)
935{
936 struct in_device *in_dev = ifa->ifa_dev;
937 struct in_ifaddr *ifa1;
938
939 if (!ifa->ifa_local)
940 return NULL;
941
942 in_dev_for_each_ifa_rtnl(ifa1, in_dev) {
943 if (ifa1->ifa_mask == ifa->ifa_mask &&
944 inet_ifa_match(ifa1->ifa_address, ifa) &&
945 ifa1->ifa_local == ifa->ifa_local)
946 return ifa1;
947 }
948 return NULL;
949}
950
951static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
952 struct netlink_ext_ack *extack)
953{
954 struct net *net = sock_net(skb->sk);
955 struct in_ifaddr *ifa;
956 struct in_ifaddr *ifa_existing;
957 __u32 valid_lft = INFINITY_LIFE_TIME;
958 __u32 prefered_lft = INFINITY_LIFE_TIME;
959
960 ASSERT_RTNL();
961
962 ifa = rtm_to_ifaddr(net, nlh, &valid_lft, &prefered_lft, extack);
963 if (IS_ERR(ifa))
964 return PTR_ERR(ifa);
965
966 ifa_existing = find_matching_ifa(ifa);
967 if (!ifa_existing) {
968 /* It would be best to check for !NLM_F_CREATE here but
969 * userspace already relies on not having to provide this.
970 */
971 set_ifa_lifetime(ifa, valid_lft, prefered_lft);
972 if (ifa->ifa_flags & IFA_F_MCAUTOJOIN) {
973 int ret = ip_mc_autojoin_config(net, true, ifa);
974
975 if (ret < 0) {
976 NL_SET_ERR_MSG(extack, "ipv4: Multicast auto join failed");
977 inet_free_ifa(ifa);
978 return ret;
979 }
980 }
981 return __inet_insert_ifa(ifa, nlh, NETLINK_CB(skb).portid,
982 extack);
983 } else {
984 u32 new_metric = ifa->ifa_rt_priority;
985 u8 new_proto = ifa->ifa_proto;
986
987 inet_free_ifa(ifa);
988
989 if (nlh->nlmsg_flags & NLM_F_EXCL ||
990 !(nlh->nlmsg_flags & NLM_F_REPLACE)) {
991 NL_SET_ERR_MSG(extack, "ipv4: Address already assigned");
992 return -EEXIST;
993 }
994 ifa = ifa_existing;
995
996 if (ifa->ifa_rt_priority != new_metric) {
997 fib_modify_prefix_metric(ifa, new_metric);
998 ifa->ifa_rt_priority = new_metric;
999 }
1000
1001 ifa->ifa_proto = new_proto;
1002
1003 set_ifa_lifetime(ifa, valid_lft, prefered_lft);
1004 cancel_delayed_work(&check_lifetime_work);
1005 queue_delayed_work(system_power_efficient_wq,
1006 &check_lifetime_work, 0);
1007 rtmsg_ifa(RTM_NEWADDR, ifa, nlh, NETLINK_CB(skb).portid);
1008 }
1009 return 0;
1010}
1011
1012/*
1013 * Determine a default network mask, based on the IP address.
1014 */
1015
1016static int inet_abc_len(__be32 addr)
1017{
1018 int rc = -1; /* Something else, probably a multicast. */
1019
1020 if (ipv4_is_zeronet(addr) || ipv4_is_lbcast(addr))
1021 rc = 0;
1022 else {
1023 __u32 haddr = ntohl(addr);
1024 if (IN_CLASSA(haddr))
1025 rc = 8;
1026 else if (IN_CLASSB(haddr))
1027 rc = 16;
1028 else if (IN_CLASSC(haddr))
1029 rc = 24;
1030 else if (IN_CLASSE(haddr))
1031 rc = 32;
1032 }
1033
1034 return rc;
1035}
1036
1037
1038int devinet_ioctl(struct net *net, unsigned int cmd, struct ifreq *ifr)
1039{
1040 struct sockaddr_in sin_orig;
1041 struct sockaddr_in *sin = (struct sockaddr_in *)&ifr->ifr_addr;
1042 struct in_ifaddr __rcu **ifap = NULL;
1043 struct in_device *in_dev;
1044 struct in_ifaddr *ifa = NULL;
1045 struct net_device *dev;
1046 char *colon;
1047 int ret = -EFAULT;
1048 int tryaddrmatch = 0;
1049
1050 ifr->ifr_name[IFNAMSIZ - 1] = 0;
1051
1052 /* save original address for comparison */
1053 memcpy(&sin_orig, sin, sizeof(*sin));
1054
1055 colon = strchr(ifr->ifr_name, ':');
1056 if (colon)
1057 *colon = 0;
1058
1059 dev_load(net, ifr->ifr_name);
1060
1061 switch (cmd) {
1062 case SIOCGIFADDR: /* Get interface address */
1063 case SIOCGIFBRDADDR: /* Get the broadcast address */
1064 case SIOCGIFDSTADDR: /* Get the destination address */
1065 case SIOCGIFNETMASK: /* Get the netmask for the interface */
1066 /* Note that these ioctls will not sleep,
1067 so that we do not impose a lock.
1068 One day we will be forced to put shlock here (I mean SMP)
1069 */
1070 tryaddrmatch = (sin_orig.sin_family == AF_INET);
1071 memset(sin, 0, sizeof(*sin));
1072 sin->sin_family = AF_INET;
1073 break;
1074
1075 case SIOCSIFFLAGS:
1076 ret = -EPERM;
1077 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1078 goto out;
1079 break;
1080 case SIOCSIFADDR: /* Set interface address (and family) */
1081 case SIOCSIFBRDADDR: /* Set the broadcast address */
1082 case SIOCSIFDSTADDR: /* Set the destination address */
1083 case SIOCSIFNETMASK: /* Set the netmask for the interface */
1084 ret = -EPERM;
1085 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1086 goto out;
1087 ret = -EINVAL;
1088 if (sin->sin_family != AF_INET)
1089 goto out;
1090 break;
1091 default:
1092 ret = -EINVAL;
1093 goto out;
1094 }
1095
1096 rtnl_lock();
1097
1098 ret = -ENODEV;
1099 dev = __dev_get_by_name(net, ifr->ifr_name);
1100 if (!dev)
1101 goto done;
1102
1103 if (colon)
1104 *colon = ':';
1105
1106 in_dev = __in_dev_get_rtnl(dev);
1107 if (in_dev) {
1108 if (tryaddrmatch) {
1109 /* Matthias Andree */
1110 /* compare label and address (4.4BSD style) */
1111 /* note: we only do this for a limited set of ioctls
1112 and only if the original address family was AF_INET.
1113 This is checked above. */
1114
1115 for (ifap = &in_dev->ifa_list;
1116 (ifa = rtnl_dereference(*ifap)) != NULL;
1117 ifap = &ifa->ifa_next) {
1118 if (!strcmp(ifr->ifr_name, ifa->ifa_label) &&
1119 sin_orig.sin_addr.s_addr ==
1120 ifa->ifa_local) {
1121 break; /* found */
1122 }
1123 }
1124 }
1125 /* we didn't get a match, maybe the application is
1126 4.3BSD-style and passed in junk so we fall back to
1127 comparing just the label */
1128 if (!ifa) {
1129 for (ifap = &in_dev->ifa_list;
1130 (ifa = rtnl_dereference(*ifap)) != NULL;
1131 ifap = &ifa->ifa_next)
1132 if (!strcmp(ifr->ifr_name, ifa->ifa_label))
1133 break;
1134 }
1135 }
1136
1137 ret = -EADDRNOTAVAIL;
1138 if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS)
1139 goto done;
1140
1141 switch (cmd) {
1142 case SIOCGIFADDR: /* Get interface address */
1143 ret = 0;
1144 sin->sin_addr.s_addr = ifa->ifa_local;
1145 break;
1146
1147 case SIOCGIFBRDADDR: /* Get the broadcast address */
1148 ret = 0;
1149 sin->sin_addr.s_addr = ifa->ifa_broadcast;
1150 break;
1151
1152 case SIOCGIFDSTADDR: /* Get the destination address */
1153 ret = 0;
1154 sin->sin_addr.s_addr = ifa->ifa_address;
1155 break;
1156
1157 case SIOCGIFNETMASK: /* Get the netmask for the interface */
1158 ret = 0;
1159 sin->sin_addr.s_addr = ifa->ifa_mask;
1160 break;
1161
1162 case SIOCSIFFLAGS:
1163 if (colon) {
1164 ret = -EADDRNOTAVAIL;
1165 if (!ifa)
1166 break;
1167 ret = 0;
1168 if (!(ifr->ifr_flags & IFF_UP))
1169 inet_del_ifa(in_dev, ifap, 1);
1170 break;
1171 }
1172 ret = dev_change_flags(dev, ifr->ifr_flags, NULL);
1173 break;
1174
1175 case SIOCSIFADDR: /* Set interface address (and family) */
1176 ret = -EINVAL;
1177 if (inet_abc_len(sin->sin_addr.s_addr) < 0)
1178 break;
1179
1180 if (!ifa) {
1181 ret = -ENOBUFS;
1182 ifa = inet_alloc_ifa();
1183 if (!ifa)
1184 break;
1185 INIT_HLIST_NODE(&ifa->hash);
1186 if (colon)
1187 memcpy(ifa->ifa_label, ifr->ifr_name, IFNAMSIZ);
1188 else
1189 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1190 } else {
1191 ret = 0;
1192 if (ifa->ifa_local == sin->sin_addr.s_addr)
1193 break;
1194 inet_del_ifa(in_dev, ifap, 0);
1195 ifa->ifa_broadcast = 0;
1196 ifa->ifa_scope = 0;
1197 }
1198
1199 ifa->ifa_address = ifa->ifa_local = sin->sin_addr.s_addr;
1200
1201 if (!(dev->flags & IFF_POINTOPOINT)) {
1202 ifa->ifa_prefixlen = inet_abc_len(ifa->ifa_address);
1203 ifa->ifa_mask = inet_make_mask(ifa->ifa_prefixlen);
1204 if ((dev->flags & IFF_BROADCAST) &&
1205 ifa->ifa_prefixlen < 31)
1206 ifa->ifa_broadcast = ifa->ifa_address |
1207 ~ifa->ifa_mask;
1208 } else {
1209 ifa->ifa_prefixlen = 32;
1210 ifa->ifa_mask = inet_make_mask(32);
1211 }
1212 set_ifa_lifetime(ifa, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1213 ret = inet_set_ifa(dev, ifa);
1214 break;
1215
1216 case SIOCSIFBRDADDR: /* Set the broadcast address */
1217 ret = 0;
1218 if (ifa->ifa_broadcast != sin->sin_addr.s_addr) {
1219 inet_del_ifa(in_dev, ifap, 0);
1220 ifa->ifa_broadcast = sin->sin_addr.s_addr;
1221 inet_insert_ifa(ifa);
1222 }
1223 break;
1224
1225 case SIOCSIFDSTADDR: /* Set the destination address */
1226 ret = 0;
1227 if (ifa->ifa_address == sin->sin_addr.s_addr)
1228 break;
1229 ret = -EINVAL;
1230 if (inet_abc_len(sin->sin_addr.s_addr) < 0)
1231 break;
1232 ret = 0;
1233 inet_del_ifa(in_dev, ifap, 0);
1234 ifa->ifa_address = sin->sin_addr.s_addr;
1235 inet_insert_ifa(ifa);
1236 break;
1237
1238 case SIOCSIFNETMASK: /* Set the netmask for the interface */
1239
1240 /*
1241 * The mask we set must be legal.
1242 */
1243 ret = -EINVAL;
1244 if (bad_mask(sin->sin_addr.s_addr, 0))
1245 break;
1246 ret = 0;
1247 if (ifa->ifa_mask != sin->sin_addr.s_addr) {
1248 __be32 old_mask = ifa->ifa_mask;
1249 inet_del_ifa(in_dev, ifap, 0);
1250 ifa->ifa_mask = sin->sin_addr.s_addr;
1251 ifa->ifa_prefixlen = inet_mask_len(ifa->ifa_mask);
1252
1253 /* See if current broadcast address matches
1254 * with current netmask, then recalculate
1255 * the broadcast address. Otherwise it's a
1256 * funny address, so don't touch it since
1257 * the user seems to know what (s)he's doing...
1258 */
1259 if ((dev->flags & IFF_BROADCAST) &&
1260 (ifa->ifa_prefixlen < 31) &&
1261 (ifa->ifa_broadcast ==
1262 (ifa->ifa_local|~old_mask))) {
1263 ifa->ifa_broadcast = (ifa->ifa_local |
1264 ~sin->sin_addr.s_addr);
1265 }
1266 inet_insert_ifa(ifa);
1267 }
1268 break;
1269 }
1270done:
1271 rtnl_unlock();
1272out:
1273 return ret;
1274}
1275
1276int inet_gifconf(struct net_device *dev, char __user *buf, int len, int size)
1277{
1278 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1279 const struct in_ifaddr *ifa;
1280 struct ifreq ifr;
1281 int done = 0;
1282
1283 if (WARN_ON(size > sizeof(struct ifreq)))
1284 goto out;
1285
1286 if (!in_dev)
1287 goto out;
1288
1289 in_dev_for_each_ifa_rtnl(ifa, in_dev) {
1290 if (!buf) {
1291 done += size;
1292 continue;
1293 }
1294 if (len < size)
1295 break;
1296 memset(&ifr, 0, sizeof(struct ifreq));
1297 strcpy(ifr.ifr_name, ifa->ifa_label);
1298
1299 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_family = AF_INET;
1300 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_addr.s_addr =
1301 ifa->ifa_local;
1302
1303 if (copy_to_user(buf + done, &ifr, size)) {
1304 done = -EFAULT;
1305 break;
1306 }
1307 len -= size;
1308 done += size;
1309 }
1310out:
1311 return done;
1312}
1313
1314static __be32 in_dev_select_addr(const struct in_device *in_dev,
1315 int scope)
1316{
1317 const struct in_ifaddr *ifa;
1318
1319 in_dev_for_each_ifa_rcu(ifa, in_dev) {
1320 if (READ_ONCE(ifa->ifa_flags) & IFA_F_SECONDARY)
1321 continue;
1322 if (ifa->ifa_scope != RT_SCOPE_LINK &&
1323 ifa->ifa_scope <= scope)
1324 return ifa->ifa_local;
1325 }
1326
1327 return 0;
1328}
1329
1330__be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope)
1331{
1332 const struct in_ifaddr *ifa;
1333 __be32 addr = 0;
1334 unsigned char localnet_scope = RT_SCOPE_HOST;
1335 struct in_device *in_dev;
1336 struct net *net = dev_net(dev);
1337 int master_idx;
1338
1339 rcu_read_lock();
1340 in_dev = __in_dev_get_rcu(dev);
1341 if (!in_dev)
1342 goto no_in_dev;
1343
1344 if (unlikely(IN_DEV_ROUTE_LOCALNET(in_dev)))
1345 localnet_scope = RT_SCOPE_LINK;
1346
1347 in_dev_for_each_ifa_rcu(ifa, in_dev) {
1348 if (READ_ONCE(ifa->ifa_flags) & IFA_F_SECONDARY)
1349 continue;
1350 if (min(ifa->ifa_scope, localnet_scope) > scope)
1351 continue;
1352 if (!dst || inet_ifa_match(dst, ifa)) {
1353 addr = ifa->ifa_local;
1354 break;
1355 }
1356 if (!addr)
1357 addr = ifa->ifa_local;
1358 }
1359
1360 if (addr)
1361 goto out_unlock;
1362no_in_dev:
1363 master_idx = l3mdev_master_ifindex_rcu(dev);
1364
1365 /* For VRFs, the VRF device takes the place of the loopback device,
1366 * with addresses on it being preferred. Note in such cases the
1367 * loopback device will be among the devices that fail the master_idx
1368 * equality check in the loop below.
1369 */
1370 if (master_idx &&
1371 (dev = dev_get_by_index_rcu(net, master_idx)) &&
1372 (in_dev = __in_dev_get_rcu(dev))) {
1373 addr = in_dev_select_addr(in_dev, scope);
1374 if (addr)
1375 goto out_unlock;
1376 }
1377
1378 /* Not loopback addresses on loopback should be preferred
1379 in this case. It is important that lo is the first interface
1380 in dev_base list.
1381 */
1382 for_each_netdev_rcu(net, dev) {
1383 if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1384 continue;
1385
1386 in_dev = __in_dev_get_rcu(dev);
1387 if (!in_dev)
1388 continue;
1389
1390 addr = in_dev_select_addr(in_dev, scope);
1391 if (addr)
1392 goto out_unlock;
1393 }
1394out_unlock:
1395 rcu_read_unlock();
1396 return addr;
1397}
1398EXPORT_SYMBOL(inet_select_addr);
1399
1400static __be32 confirm_addr_indev(struct in_device *in_dev, __be32 dst,
1401 __be32 local, int scope)
1402{
1403 unsigned char localnet_scope = RT_SCOPE_HOST;
1404 const struct in_ifaddr *ifa;
1405 __be32 addr = 0;
1406 int same = 0;
1407
1408 if (unlikely(IN_DEV_ROUTE_LOCALNET(in_dev)))
1409 localnet_scope = RT_SCOPE_LINK;
1410
1411 in_dev_for_each_ifa_rcu(ifa, in_dev) {
1412 unsigned char min_scope = min(ifa->ifa_scope, localnet_scope);
1413
1414 if (!addr &&
1415 (local == ifa->ifa_local || !local) &&
1416 min_scope <= scope) {
1417 addr = ifa->ifa_local;
1418 if (same)
1419 break;
1420 }
1421 if (!same) {
1422 same = (!local || inet_ifa_match(local, ifa)) &&
1423 (!dst || inet_ifa_match(dst, ifa));
1424 if (same && addr) {
1425 if (local || !dst)
1426 break;
1427 /* Is the selected addr into dst subnet? */
1428 if (inet_ifa_match(addr, ifa))
1429 break;
1430 /* No, then can we use new local src? */
1431 if (min_scope <= scope) {
1432 addr = ifa->ifa_local;
1433 break;
1434 }
1435 /* search for large dst subnet for addr */
1436 same = 0;
1437 }
1438 }
1439 }
1440
1441 return same ? addr : 0;
1442}
1443
1444/*
1445 * Confirm that local IP address exists using wildcards:
1446 * - net: netns to check, cannot be NULL
1447 * - in_dev: only on this interface, NULL=any interface
1448 * - dst: only in the same subnet as dst, 0=any dst
1449 * - local: address, 0=autoselect the local address
1450 * - scope: maximum allowed scope value for the local address
1451 */
1452__be32 inet_confirm_addr(struct net *net, struct in_device *in_dev,
1453 __be32 dst, __be32 local, int scope)
1454{
1455 __be32 addr = 0;
1456 struct net_device *dev;
1457
1458 if (in_dev)
1459 return confirm_addr_indev(in_dev, dst, local, scope);
1460
1461 rcu_read_lock();
1462 for_each_netdev_rcu(net, dev) {
1463 in_dev = __in_dev_get_rcu(dev);
1464 if (in_dev) {
1465 addr = confirm_addr_indev(in_dev, dst, local, scope);
1466 if (addr)
1467 break;
1468 }
1469 }
1470 rcu_read_unlock();
1471
1472 return addr;
1473}
1474EXPORT_SYMBOL(inet_confirm_addr);
1475
1476/*
1477 * Device notifier
1478 */
1479
1480int register_inetaddr_notifier(struct notifier_block *nb)
1481{
1482 return blocking_notifier_chain_register(&inetaddr_chain, nb);
1483}
1484EXPORT_SYMBOL(register_inetaddr_notifier);
1485
1486int unregister_inetaddr_notifier(struct notifier_block *nb)
1487{
1488 return blocking_notifier_chain_unregister(&inetaddr_chain, nb);
1489}
1490EXPORT_SYMBOL(unregister_inetaddr_notifier);
1491
1492int register_inetaddr_validator_notifier(struct notifier_block *nb)
1493{
1494 return blocking_notifier_chain_register(&inetaddr_validator_chain, nb);
1495}
1496EXPORT_SYMBOL(register_inetaddr_validator_notifier);
1497
1498int unregister_inetaddr_validator_notifier(struct notifier_block *nb)
1499{
1500 return blocking_notifier_chain_unregister(&inetaddr_validator_chain,
1501 nb);
1502}
1503EXPORT_SYMBOL(unregister_inetaddr_validator_notifier);
1504
1505/* Rename ifa_labels for a device name change. Make some effort to preserve
1506 * existing alias numbering and to create unique labels if possible.
1507*/
1508static void inetdev_changename(struct net_device *dev, struct in_device *in_dev)
1509{
1510 struct in_ifaddr *ifa;
1511 int named = 0;
1512
1513 in_dev_for_each_ifa_rtnl(ifa, in_dev) {
1514 char old[IFNAMSIZ], *dot;
1515
1516 memcpy(old, ifa->ifa_label, IFNAMSIZ);
1517 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1518 if (named++ == 0)
1519 goto skip;
1520 dot = strchr(old, ':');
1521 if (!dot) {
1522 sprintf(old, ":%d", named);
1523 dot = old;
1524 }
1525 if (strlen(dot) + strlen(dev->name) < IFNAMSIZ)
1526 strcat(ifa->ifa_label, dot);
1527 else
1528 strcpy(ifa->ifa_label + (IFNAMSIZ - strlen(dot) - 1), dot);
1529skip:
1530 rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0);
1531 }
1532}
1533
1534static void inetdev_send_gratuitous_arp(struct net_device *dev,
1535 struct in_device *in_dev)
1536
1537{
1538 const struct in_ifaddr *ifa;
1539
1540 in_dev_for_each_ifa_rtnl(ifa, in_dev) {
1541 arp_send(ARPOP_REQUEST, ETH_P_ARP,
1542 ifa->ifa_local, dev,
1543 ifa->ifa_local, NULL,
1544 dev->dev_addr, NULL);
1545 }
1546}
1547
1548/* Called only under RTNL semaphore */
1549
1550static int inetdev_event(struct notifier_block *this, unsigned long event,
1551 void *ptr)
1552{
1553 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1554 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1555
1556 ASSERT_RTNL();
1557
1558 if (!in_dev) {
1559 if (event == NETDEV_REGISTER) {
1560 in_dev = inetdev_init(dev);
1561 if (IS_ERR(in_dev))
1562 return notifier_from_errno(PTR_ERR(in_dev));
1563 if (dev->flags & IFF_LOOPBACK) {
1564 IN_DEV_CONF_SET(in_dev, NOXFRM, 1);
1565 IN_DEV_CONF_SET(in_dev, NOPOLICY, 1);
1566 }
1567 } else if (event == NETDEV_CHANGEMTU) {
1568 /* Re-enabling IP */
1569 if (inetdev_valid_mtu(dev->mtu))
1570 in_dev = inetdev_init(dev);
1571 }
1572 goto out;
1573 }
1574
1575 switch (event) {
1576 case NETDEV_REGISTER:
1577 pr_debug("%s: bug\n", __func__);
1578 RCU_INIT_POINTER(dev->ip_ptr, NULL);
1579 break;
1580 case NETDEV_UP:
1581 if (!inetdev_valid_mtu(dev->mtu))
1582 break;
1583 if (dev->flags & IFF_LOOPBACK) {
1584 struct in_ifaddr *ifa = inet_alloc_ifa();
1585
1586 if (ifa) {
1587 INIT_HLIST_NODE(&ifa->hash);
1588 ifa->ifa_local =
1589 ifa->ifa_address = htonl(INADDR_LOOPBACK);
1590 ifa->ifa_prefixlen = 8;
1591 ifa->ifa_mask = inet_make_mask(8);
1592 in_dev_hold(in_dev);
1593 ifa->ifa_dev = in_dev;
1594 ifa->ifa_scope = RT_SCOPE_HOST;
1595 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1596 set_ifa_lifetime(ifa, INFINITY_LIFE_TIME,
1597 INFINITY_LIFE_TIME);
1598 ipv4_devconf_setall(in_dev);
1599 neigh_parms_data_state_setall(in_dev->arp_parms);
1600 inet_insert_ifa(ifa);
1601 }
1602 }
1603 ip_mc_up(in_dev);
1604 fallthrough;
1605 case NETDEV_CHANGEADDR:
1606 if (!IN_DEV_ARP_NOTIFY(in_dev))
1607 break;
1608 fallthrough;
1609 case NETDEV_NOTIFY_PEERS:
1610 /* Send gratuitous ARP to notify of link change */
1611 inetdev_send_gratuitous_arp(dev, in_dev);
1612 break;
1613 case NETDEV_DOWN:
1614 ip_mc_down(in_dev);
1615 break;
1616 case NETDEV_PRE_TYPE_CHANGE:
1617 ip_mc_unmap(in_dev);
1618 break;
1619 case NETDEV_POST_TYPE_CHANGE:
1620 ip_mc_remap(in_dev);
1621 break;
1622 case NETDEV_CHANGEMTU:
1623 if (inetdev_valid_mtu(dev->mtu))
1624 break;
1625 /* disable IP when MTU is not enough */
1626 fallthrough;
1627 case NETDEV_UNREGISTER:
1628 inetdev_destroy(in_dev);
1629 break;
1630 case NETDEV_CHANGENAME:
1631 /* Do not notify about label change, this event is
1632 * not interesting to applications using netlink.
1633 */
1634 inetdev_changename(dev, in_dev);
1635
1636 devinet_sysctl_unregister(in_dev);
1637 devinet_sysctl_register(in_dev);
1638 break;
1639 }
1640out:
1641 return NOTIFY_DONE;
1642}
1643
1644static struct notifier_block ip_netdev_notifier = {
1645 .notifier_call = inetdev_event,
1646};
1647
1648static size_t inet_nlmsg_size(void)
1649{
1650 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
1651 + nla_total_size(4) /* IFA_ADDRESS */
1652 + nla_total_size(4) /* IFA_LOCAL */
1653 + nla_total_size(4) /* IFA_BROADCAST */
1654 + nla_total_size(IFNAMSIZ) /* IFA_LABEL */
1655 + nla_total_size(4) /* IFA_FLAGS */
1656 + nla_total_size(1) /* IFA_PROTO */
1657 + nla_total_size(4) /* IFA_RT_PRIORITY */
1658 + nla_total_size(sizeof(struct ifa_cacheinfo)); /* IFA_CACHEINFO */
1659}
1660
1661static inline u32 cstamp_delta(unsigned long cstamp)
1662{
1663 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
1664}
1665
1666static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
1667 unsigned long tstamp, u32 preferred, u32 valid)
1668{
1669 struct ifa_cacheinfo ci;
1670
1671 ci.cstamp = cstamp_delta(cstamp);
1672 ci.tstamp = cstamp_delta(tstamp);
1673 ci.ifa_prefered = preferred;
1674 ci.ifa_valid = valid;
1675
1676 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
1677}
1678
1679static int inet_fill_ifaddr(struct sk_buff *skb, const struct in_ifaddr *ifa,
1680 struct inet_fill_args *args)
1681{
1682 struct ifaddrmsg *ifm;
1683 struct nlmsghdr *nlh;
1684 unsigned long tstamp;
1685 u32 preferred, valid;
1686 u32 flags;
1687
1688 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, sizeof(*ifm),
1689 args->flags);
1690 if (!nlh)
1691 return -EMSGSIZE;
1692
1693 ifm = nlmsg_data(nlh);
1694 ifm->ifa_family = AF_INET;
1695 ifm->ifa_prefixlen = ifa->ifa_prefixlen;
1696
1697 flags = READ_ONCE(ifa->ifa_flags);
1698 /* Warning : ifm->ifa_flags is an __u8, it holds only 8 bits.
1699 * The 32bit value is given in IFA_FLAGS attribute.
1700 */
1701 ifm->ifa_flags = (__u8)flags;
1702
1703 ifm->ifa_scope = ifa->ifa_scope;
1704 ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
1705
1706 if (args->netnsid >= 0 &&
1707 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid))
1708 goto nla_put_failure;
1709
1710 tstamp = READ_ONCE(ifa->ifa_tstamp);
1711 if (!(flags & IFA_F_PERMANENT)) {
1712 preferred = READ_ONCE(ifa->ifa_preferred_lft);
1713 valid = READ_ONCE(ifa->ifa_valid_lft);
1714 if (preferred != INFINITY_LIFE_TIME) {
1715 long tval = (jiffies - tstamp) / HZ;
1716
1717 if (preferred > tval)
1718 preferred -= tval;
1719 else
1720 preferred = 0;
1721 if (valid != INFINITY_LIFE_TIME) {
1722 if (valid > tval)
1723 valid -= tval;
1724 else
1725 valid = 0;
1726 }
1727 }
1728 } else {
1729 preferred = INFINITY_LIFE_TIME;
1730 valid = INFINITY_LIFE_TIME;
1731 }
1732 if ((ifa->ifa_address &&
1733 nla_put_in_addr(skb, IFA_ADDRESS, ifa->ifa_address)) ||
1734 (ifa->ifa_local &&
1735 nla_put_in_addr(skb, IFA_LOCAL, ifa->ifa_local)) ||
1736 (ifa->ifa_broadcast &&
1737 nla_put_in_addr(skb, IFA_BROADCAST, ifa->ifa_broadcast)) ||
1738 (ifa->ifa_label[0] &&
1739 nla_put_string(skb, IFA_LABEL, ifa->ifa_label)) ||
1740 (ifa->ifa_proto &&
1741 nla_put_u8(skb, IFA_PROTO, ifa->ifa_proto)) ||
1742 nla_put_u32(skb, IFA_FLAGS, flags) ||
1743 (ifa->ifa_rt_priority &&
1744 nla_put_u32(skb, IFA_RT_PRIORITY, ifa->ifa_rt_priority)) ||
1745 put_cacheinfo(skb, READ_ONCE(ifa->ifa_cstamp), tstamp,
1746 preferred, valid))
1747 goto nla_put_failure;
1748
1749 nlmsg_end(skb, nlh);
1750 return 0;
1751
1752nla_put_failure:
1753 nlmsg_cancel(skb, nlh);
1754 return -EMSGSIZE;
1755}
1756
1757static int inet_valid_dump_ifaddr_req(const struct nlmsghdr *nlh,
1758 struct inet_fill_args *fillargs,
1759 struct net **tgt_net, struct sock *sk,
1760 struct netlink_callback *cb)
1761{
1762 struct netlink_ext_ack *extack = cb->extack;
1763 struct nlattr *tb[IFA_MAX+1];
1764 struct ifaddrmsg *ifm;
1765 int err, i;
1766
1767 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
1768 NL_SET_ERR_MSG(extack, "ipv4: Invalid header for address dump request");
1769 return -EINVAL;
1770 }
1771
1772 ifm = nlmsg_data(nlh);
1773 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
1774 NL_SET_ERR_MSG(extack, "ipv4: Invalid values in header for address dump request");
1775 return -EINVAL;
1776 }
1777
1778 fillargs->ifindex = ifm->ifa_index;
1779 if (fillargs->ifindex) {
1780 cb->answer_flags |= NLM_F_DUMP_FILTERED;
1781 fillargs->flags |= NLM_F_DUMP_FILTERED;
1782 }
1783
1784 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
1785 ifa_ipv4_policy, extack);
1786 if (err < 0)
1787 return err;
1788
1789 for (i = 0; i <= IFA_MAX; ++i) {
1790 if (!tb[i])
1791 continue;
1792
1793 if (i == IFA_TARGET_NETNSID) {
1794 struct net *net;
1795
1796 fillargs->netnsid = nla_get_s32(tb[i]);
1797
1798 net = rtnl_get_net_ns_capable(sk, fillargs->netnsid);
1799 if (IS_ERR(net)) {
1800 fillargs->netnsid = -1;
1801 NL_SET_ERR_MSG(extack, "ipv4: Invalid target network namespace id");
1802 return PTR_ERR(net);
1803 }
1804 *tgt_net = net;
1805 } else {
1806 NL_SET_ERR_MSG(extack, "ipv4: Unsupported attribute in dump request");
1807 return -EINVAL;
1808 }
1809 }
1810
1811 return 0;
1812}
1813
1814static int in_dev_dump_addr(struct in_device *in_dev, struct sk_buff *skb,
1815 struct netlink_callback *cb, int *s_ip_idx,
1816 struct inet_fill_args *fillargs)
1817{
1818 struct in_ifaddr *ifa;
1819 int ip_idx = 0;
1820 int err;
1821
1822 in_dev_for_each_ifa_rcu(ifa, in_dev) {
1823 if (ip_idx < *s_ip_idx) {
1824 ip_idx++;
1825 continue;
1826 }
1827 err = inet_fill_ifaddr(skb, ifa, fillargs);
1828 if (err < 0)
1829 goto done;
1830
1831 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1832 ip_idx++;
1833 }
1834 err = 0;
1835 ip_idx = 0;
1836done:
1837 *s_ip_idx = ip_idx;
1838
1839 return err;
1840}
1841
1842/* Combine dev_addr_genid and dev_base_seq to detect changes.
1843 */
1844static u32 inet_base_seq(const struct net *net)
1845{
1846 u32 res = atomic_read(&net->ipv4.dev_addr_genid) +
1847 READ_ONCE(net->dev_base_seq);
1848
1849 /* Must not return 0 (see nl_dump_check_consistent()).
1850 * Chose a value far away from 0.
1851 */
1852 if (!res)
1853 res = 0x80000000;
1854 return res;
1855}
1856
1857static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
1858{
1859 const struct nlmsghdr *nlh = cb->nlh;
1860 struct inet_fill_args fillargs = {
1861 .portid = NETLINK_CB(cb->skb).portid,
1862 .seq = nlh->nlmsg_seq,
1863 .event = RTM_NEWADDR,
1864 .flags = NLM_F_MULTI,
1865 .netnsid = -1,
1866 };
1867 struct net *net = sock_net(skb->sk);
1868 struct net *tgt_net = net;
1869 struct {
1870 unsigned long ifindex;
1871 int ip_idx;
1872 } *ctx = (void *)cb->ctx;
1873 struct in_device *in_dev;
1874 struct net_device *dev;
1875 int err = 0;
1876
1877 rcu_read_lock();
1878 if (cb->strict_check) {
1879 err = inet_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net,
1880 skb->sk, cb);
1881 if (err < 0)
1882 goto done;
1883
1884 if (fillargs.ifindex) {
1885 dev = dev_get_by_index_rcu(tgt_net, fillargs.ifindex);
1886 if (!dev) {
1887 err = -ENODEV;
1888 goto done;
1889 }
1890 in_dev = __in_dev_get_rcu(dev);
1891 if (!in_dev)
1892 goto done;
1893 err = in_dev_dump_addr(in_dev, skb, cb, &ctx->ip_idx,
1894 &fillargs);
1895 goto done;
1896 }
1897 }
1898
1899 cb->seq = inet_base_seq(tgt_net);
1900
1901 for_each_netdev_dump(tgt_net, dev, ctx->ifindex) {
1902 in_dev = __in_dev_get_rcu(dev);
1903 if (!in_dev)
1904 continue;
1905 err = in_dev_dump_addr(in_dev, skb, cb, &ctx->ip_idx,
1906 &fillargs);
1907 if (err < 0)
1908 goto done;
1909 }
1910done:
1911 if (fillargs.netnsid >= 0)
1912 put_net(tgt_net);
1913 rcu_read_unlock();
1914 return err;
1915}
1916
1917static void rtmsg_ifa(int event, struct in_ifaddr *ifa, struct nlmsghdr *nlh,
1918 u32 portid)
1919{
1920 struct inet_fill_args fillargs = {
1921 .portid = portid,
1922 .seq = nlh ? nlh->nlmsg_seq : 0,
1923 .event = event,
1924 .flags = 0,
1925 .netnsid = -1,
1926 };
1927 struct sk_buff *skb;
1928 int err = -ENOBUFS;
1929 struct net *net;
1930
1931 net = dev_net(ifa->ifa_dev->dev);
1932 skb = nlmsg_new(inet_nlmsg_size(), GFP_KERNEL);
1933 if (!skb)
1934 goto errout;
1935
1936 err = inet_fill_ifaddr(skb, ifa, &fillargs);
1937 if (err < 0) {
1938 /* -EMSGSIZE implies BUG in inet_nlmsg_size() */
1939 WARN_ON(err == -EMSGSIZE);
1940 kfree_skb(skb);
1941 goto errout;
1942 }
1943 rtnl_notify(skb, net, portid, RTNLGRP_IPV4_IFADDR, nlh, GFP_KERNEL);
1944 return;
1945errout:
1946 if (err < 0)
1947 rtnl_set_sk_err(net, RTNLGRP_IPV4_IFADDR, err);
1948}
1949
1950static size_t inet_get_link_af_size(const struct net_device *dev,
1951 u32 ext_filter_mask)
1952{
1953 struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr);
1954
1955 if (!in_dev)
1956 return 0;
1957
1958 return nla_total_size(IPV4_DEVCONF_MAX * 4); /* IFLA_INET_CONF */
1959}
1960
1961static int inet_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
1962 u32 ext_filter_mask)
1963{
1964 struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr);
1965 struct nlattr *nla;
1966 int i;
1967
1968 if (!in_dev)
1969 return -ENODATA;
1970
1971 nla = nla_reserve(skb, IFLA_INET_CONF, IPV4_DEVCONF_MAX * 4);
1972 if (!nla)
1973 return -EMSGSIZE;
1974
1975 for (i = 0; i < IPV4_DEVCONF_MAX; i++)
1976 ((u32 *) nla_data(nla))[i] = READ_ONCE(in_dev->cnf.data[i]);
1977
1978 return 0;
1979}
1980
1981static const struct nla_policy inet_af_policy[IFLA_INET_MAX+1] = {
1982 [IFLA_INET_CONF] = { .type = NLA_NESTED },
1983};
1984
1985static int inet_validate_link_af(const struct net_device *dev,
1986 const struct nlattr *nla,
1987 struct netlink_ext_ack *extack)
1988{
1989 struct nlattr *a, *tb[IFLA_INET_MAX+1];
1990 int err, rem;
1991
1992 if (dev && !__in_dev_get_rtnl(dev))
1993 return -EAFNOSUPPORT;
1994
1995 err = nla_parse_nested_deprecated(tb, IFLA_INET_MAX, nla,
1996 inet_af_policy, extack);
1997 if (err < 0)
1998 return err;
1999
2000 if (tb[IFLA_INET_CONF]) {
2001 nla_for_each_nested(a, tb[IFLA_INET_CONF], rem) {
2002 int cfgid = nla_type(a);
2003
2004 if (nla_len(a) < 4)
2005 return -EINVAL;
2006
2007 if (cfgid <= 0 || cfgid > IPV4_DEVCONF_MAX)
2008 return -EINVAL;
2009 }
2010 }
2011
2012 return 0;
2013}
2014
2015static int inet_set_link_af(struct net_device *dev, const struct nlattr *nla,
2016 struct netlink_ext_ack *extack)
2017{
2018 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2019 struct nlattr *a, *tb[IFLA_INET_MAX+1];
2020 int rem;
2021
2022 if (!in_dev)
2023 return -EAFNOSUPPORT;
2024
2025 if (nla_parse_nested_deprecated(tb, IFLA_INET_MAX, nla, NULL, NULL) < 0)
2026 return -EINVAL;
2027
2028 if (tb[IFLA_INET_CONF]) {
2029 nla_for_each_nested(a, tb[IFLA_INET_CONF], rem)
2030 ipv4_devconf_set(in_dev, nla_type(a), nla_get_u32(a));
2031 }
2032
2033 return 0;
2034}
2035
2036static int inet_netconf_msgsize_devconf(int type)
2037{
2038 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
2039 + nla_total_size(4); /* NETCONFA_IFINDEX */
2040 bool all = false;
2041
2042 if (type == NETCONFA_ALL)
2043 all = true;
2044
2045 if (all || type == NETCONFA_FORWARDING)
2046 size += nla_total_size(4);
2047 if (all || type == NETCONFA_RP_FILTER)
2048 size += nla_total_size(4);
2049 if (all || type == NETCONFA_MC_FORWARDING)
2050 size += nla_total_size(4);
2051 if (all || type == NETCONFA_BC_FORWARDING)
2052 size += nla_total_size(4);
2053 if (all || type == NETCONFA_PROXY_NEIGH)
2054 size += nla_total_size(4);
2055 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
2056 size += nla_total_size(4);
2057
2058 return size;
2059}
2060
2061static int inet_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
2062 const struct ipv4_devconf *devconf,
2063 u32 portid, u32 seq, int event,
2064 unsigned int flags, int type)
2065{
2066 struct nlmsghdr *nlh;
2067 struct netconfmsg *ncm;
2068 bool all = false;
2069
2070 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
2071 flags);
2072 if (!nlh)
2073 return -EMSGSIZE;
2074
2075 if (type == NETCONFA_ALL)
2076 all = true;
2077
2078 ncm = nlmsg_data(nlh);
2079 ncm->ncm_family = AF_INET;
2080
2081 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
2082 goto nla_put_failure;
2083
2084 if (!devconf)
2085 goto out;
2086
2087 if ((all || type == NETCONFA_FORWARDING) &&
2088 nla_put_s32(skb, NETCONFA_FORWARDING,
2089 IPV4_DEVCONF_RO(*devconf, FORWARDING)) < 0)
2090 goto nla_put_failure;
2091 if ((all || type == NETCONFA_RP_FILTER) &&
2092 nla_put_s32(skb, NETCONFA_RP_FILTER,
2093 IPV4_DEVCONF_RO(*devconf, RP_FILTER)) < 0)
2094 goto nla_put_failure;
2095 if ((all || type == NETCONFA_MC_FORWARDING) &&
2096 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
2097 IPV4_DEVCONF_RO(*devconf, MC_FORWARDING)) < 0)
2098 goto nla_put_failure;
2099 if ((all || type == NETCONFA_BC_FORWARDING) &&
2100 nla_put_s32(skb, NETCONFA_BC_FORWARDING,
2101 IPV4_DEVCONF_RO(*devconf, BC_FORWARDING)) < 0)
2102 goto nla_put_failure;
2103 if ((all || type == NETCONFA_PROXY_NEIGH) &&
2104 nla_put_s32(skb, NETCONFA_PROXY_NEIGH,
2105 IPV4_DEVCONF_RO(*devconf, PROXY_ARP)) < 0)
2106 goto nla_put_failure;
2107 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
2108 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
2109 IPV4_DEVCONF_RO(*devconf,
2110 IGNORE_ROUTES_WITH_LINKDOWN)) < 0)
2111 goto nla_put_failure;
2112
2113out:
2114 nlmsg_end(skb, nlh);
2115 return 0;
2116
2117nla_put_failure:
2118 nlmsg_cancel(skb, nlh);
2119 return -EMSGSIZE;
2120}
2121
2122void inet_netconf_notify_devconf(struct net *net, int event, int type,
2123 int ifindex, struct ipv4_devconf *devconf)
2124{
2125 struct sk_buff *skb;
2126 int err = -ENOBUFS;
2127
2128 skb = nlmsg_new(inet_netconf_msgsize_devconf(type), GFP_KERNEL);
2129 if (!skb)
2130 goto errout;
2131
2132 err = inet_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
2133 event, 0, type);
2134 if (err < 0) {
2135 /* -EMSGSIZE implies BUG in inet_netconf_msgsize_devconf() */
2136 WARN_ON(err == -EMSGSIZE);
2137 kfree_skb(skb);
2138 goto errout;
2139 }
2140 rtnl_notify(skb, net, 0, RTNLGRP_IPV4_NETCONF, NULL, GFP_KERNEL);
2141 return;
2142errout:
2143 if (err < 0)
2144 rtnl_set_sk_err(net, RTNLGRP_IPV4_NETCONF, err);
2145}
2146
2147static const struct nla_policy devconf_ipv4_policy[NETCONFA_MAX+1] = {
2148 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
2149 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
2150 [NETCONFA_RP_FILTER] = { .len = sizeof(int) },
2151 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
2152 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
2153};
2154
2155static int inet_netconf_valid_get_req(struct sk_buff *skb,
2156 const struct nlmsghdr *nlh,
2157 struct nlattr **tb,
2158 struct netlink_ext_ack *extack)
2159{
2160 int i, err;
2161
2162 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) {
2163 NL_SET_ERR_MSG(extack, "ipv4: Invalid header for netconf get request");
2164 return -EINVAL;
2165 }
2166
2167 if (!netlink_strict_get_check(skb))
2168 return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg),
2169 tb, NETCONFA_MAX,
2170 devconf_ipv4_policy, extack);
2171
2172 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg),
2173 tb, NETCONFA_MAX,
2174 devconf_ipv4_policy, extack);
2175 if (err)
2176 return err;
2177
2178 for (i = 0; i <= NETCONFA_MAX; i++) {
2179 if (!tb[i])
2180 continue;
2181
2182 switch (i) {
2183 case NETCONFA_IFINDEX:
2184 break;
2185 default:
2186 NL_SET_ERR_MSG(extack, "ipv4: Unsupported attribute in netconf get request");
2187 return -EINVAL;
2188 }
2189 }
2190
2191 return 0;
2192}
2193
2194static int inet_netconf_get_devconf(struct sk_buff *in_skb,
2195 struct nlmsghdr *nlh,
2196 struct netlink_ext_ack *extack)
2197{
2198 struct net *net = sock_net(in_skb->sk);
2199 struct nlattr *tb[NETCONFA_MAX + 1];
2200 const struct ipv4_devconf *devconf;
2201 struct in_device *in_dev = NULL;
2202 struct net_device *dev = NULL;
2203 struct sk_buff *skb;
2204 int ifindex;
2205 int err;
2206
2207 err = inet_netconf_valid_get_req(in_skb, nlh, tb, extack);
2208 if (err)
2209 return err;
2210
2211 if (!tb[NETCONFA_IFINDEX])
2212 return -EINVAL;
2213
2214 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
2215 switch (ifindex) {
2216 case NETCONFA_IFINDEX_ALL:
2217 devconf = net->ipv4.devconf_all;
2218 break;
2219 case NETCONFA_IFINDEX_DEFAULT:
2220 devconf = net->ipv4.devconf_dflt;
2221 break;
2222 default:
2223 err = -ENODEV;
2224 dev = dev_get_by_index(net, ifindex);
2225 if (dev)
2226 in_dev = in_dev_get(dev);
2227 if (!in_dev)
2228 goto errout;
2229 devconf = &in_dev->cnf;
2230 break;
2231 }
2232
2233 err = -ENOBUFS;
2234 skb = nlmsg_new(inet_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL);
2235 if (!skb)
2236 goto errout;
2237
2238 err = inet_netconf_fill_devconf(skb, ifindex, devconf,
2239 NETLINK_CB(in_skb).portid,
2240 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
2241 NETCONFA_ALL);
2242 if (err < 0) {
2243 /* -EMSGSIZE implies BUG in inet_netconf_msgsize_devconf() */
2244 WARN_ON(err == -EMSGSIZE);
2245 kfree_skb(skb);
2246 goto errout;
2247 }
2248 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
2249errout:
2250 if (in_dev)
2251 in_dev_put(in_dev);
2252 dev_put(dev);
2253 return err;
2254}
2255
2256static int inet_netconf_dump_devconf(struct sk_buff *skb,
2257 struct netlink_callback *cb)
2258{
2259 const struct nlmsghdr *nlh = cb->nlh;
2260 struct net *net = sock_net(skb->sk);
2261 struct {
2262 unsigned long ifindex;
2263 unsigned int all_default;
2264 } *ctx = (void *)cb->ctx;
2265 const struct in_device *in_dev;
2266 struct net_device *dev;
2267 int err = 0;
2268
2269 if (cb->strict_check) {
2270 struct netlink_ext_ack *extack = cb->extack;
2271 struct netconfmsg *ncm;
2272
2273 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) {
2274 NL_SET_ERR_MSG(extack, "ipv4: Invalid header for netconf dump request");
2275 return -EINVAL;
2276 }
2277
2278 if (nlmsg_attrlen(nlh, sizeof(*ncm))) {
2279 NL_SET_ERR_MSG(extack, "ipv4: Invalid data after header in netconf dump request");
2280 return -EINVAL;
2281 }
2282 }
2283
2284 rcu_read_lock();
2285 for_each_netdev_dump(net, dev, ctx->ifindex) {
2286 in_dev = __in_dev_get_rcu(dev);
2287 if (!in_dev)
2288 continue;
2289 err = inet_netconf_fill_devconf(skb, dev->ifindex,
2290 &in_dev->cnf,
2291 NETLINK_CB(cb->skb).portid,
2292 nlh->nlmsg_seq,
2293 RTM_NEWNETCONF, NLM_F_MULTI,
2294 NETCONFA_ALL);
2295 if (err < 0)
2296 goto done;
2297 }
2298 if (ctx->all_default == 0) {
2299 err = inet_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
2300 net->ipv4.devconf_all,
2301 NETLINK_CB(cb->skb).portid,
2302 nlh->nlmsg_seq,
2303 RTM_NEWNETCONF, NLM_F_MULTI,
2304 NETCONFA_ALL);
2305 if (err < 0)
2306 goto done;
2307 ctx->all_default++;
2308 }
2309 if (ctx->all_default == 1) {
2310 err = inet_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
2311 net->ipv4.devconf_dflt,
2312 NETLINK_CB(cb->skb).portid,
2313 nlh->nlmsg_seq,
2314 RTM_NEWNETCONF, NLM_F_MULTI,
2315 NETCONFA_ALL);
2316 if (err < 0)
2317 goto done;
2318 ctx->all_default++;
2319 }
2320done:
2321 rcu_read_unlock();
2322 return err;
2323}
2324
2325#ifdef CONFIG_SYSCTL
2326
2327static void devinet_copy_dflt_conf(struct net *net, int i)
2328{
2329 struct net_device *dev;
2330
2331 rcu_read_lock();
2332 for_each_netdev_rcu(net, dev) {
2333 struct in_device *in_dev;
2334
2335 in_dev = __in_dev_get_rcu(dev);
2336 if (in_dev && !test_bit(i, in_dev->cnf.state))
2337 in_dev->cnf.data[i] = net->ipv4.devconf_dflt->data[i];
2338 }
2339 rcu_read_unlock();
2340}
2341
2342/* called with RTNL locked */
2343static void inet_forward_change(struct net *net)
2344{
2345 struct net_device *dev;
2346 int on = IPV4_DEVCONF_ALL(net, FORWARDING);
2347
2348 IPV4_DEVCONF_ALL(net, ACCEPT_REDIRECTS) = !on;
2349 IPV4_DEVCONF_DFLT(net, FORWARDING) = on;
2350 inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
2351 NETCONFA_FORWARDING,
2352 NETCONFA_IFINDEX_ALL,
2353 net->ipv4.devconf_all);
2354 inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
2355 NETCONFA_FORWARDING,
2356 NETCONFA_IFINDEX_DEFAULT,
2357 net->ipv4.devconf_dflt);
2358
2359 for_each_netdev(net, dev) {
2360 struct in_device *in_dev;
2361
2362 if (on)
2363 dev_disable_lro(dev);
2364
2365 in_dev = __in_dev_get_rtnl(dev);
2366 if (in_dev) {
2367 IN_DEV_CONF_SET(in_dev, FORWARDING, on);
2368 inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
2369 NETCONFA_FORWARDING,
2370 dev->ifindex, &in_dev->cnf);
2371 }
2372 }
2373}
2374
2375static int devinet_conf_ifindex(struct net *net, struct ipv4_devconf *cnf)
2376{
2377 if (cnf == net->ipv4.devconf_dflt)
2378 return NETCONFA_IFINDEX_DEFAULT;
2379 else if (cnf == net->ipv4.devconf_all)
2380 return NETCONFA_IFINDEX_ALL;
2381 else {
2382 struct in_device *idev
2383 = container_of(cnf, struct in_device, cnf);
2384 return idev->dev->ifindex;
2385 }
2386}
2387
2388static int devinet_conf_proc(struct ctl_table *ctl, int write,
2389 void *buffer, size_t *lenp, loff_t *ppos)
2390{
2391 int old_value = *(int *)ctl->data;
2392 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
2393 int new_value = *(int *)ctl->data;
2394
2395 if (write) {
2396 struct ipv4_devconf *cnf = ctl->extra1;
2397 struct net *net = ctl->extra2;
2398 int i = (int *)ctl->data - cnf->data;
2399 int ifindex;
2400
2401 set_bit(i, cnf->state);
2402
2403 if (cnf == net->ipv4.devconf_dflt)
2404 devinet_copy_dflt_conf(net, i);
2405 if (i == IPV4_DEVCONF_ACCEPT_LOCAL - 1 ||
2406 i == IPV4_DEVCONF_ROUTE_LOCALNET - 1)
2407 if ((new_value == 0) && (old_value != 0))
2408 rt_cache_flush(net);
2409
2410 if (i == IPV4_DEVCONF_BC_FORWARDING - 1 &&
2411 new_value != old_value)
2412 rt_cache_flush(net);
2413
2414 if (i == IPV4_DEVCONF_RP_FILTER - 1 &&
2415 new_value != old_value) {
2416 ifindex = devinet_conf_ifindex(net, cnf);
2417 inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
2418 NETCONFA_RP_FILTER,
2419 ifindex, cnf);
2420 }
2421 if (i == IPV4_DEVCONF_PROXY_ARP - 1 &&
2422 new_value != old_value) {
2423 ifindex = devinet_conf_ifindex(net, cnf);
2424 inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
2425 NETCONFA_PROXY_NEIGH,
2426 ifindex, cnf);
2427 }
2428 if (i == IPV4_DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN - 1 &&
2429 new_value != old_value) {
2430 ifindex = devinet_conf_ifindex(net, cnf);
2431 inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
2432 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
2433 ifindex, cnf);
2434 }
2435 }
2436
2437 return ret;
2438}
2439
2440static int devinet_sysctl_forward(struct ctl_table *ctl, int write,
2441 void *buffer, size_t *lenp, loff_t *ppos)
2442{
2443 int *valp = ctl->data;
2444 int val = *valp;
2445 loff_t pos = *ppos;
2446 struct net *net = ctl->extra2;
2447 int ret;
2448
2449 if (write && !ns_capable(net->user_ns, CAP_NET_ADMIN))
2450 return -EPERM;
2451
2452 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
2453
2454 if (write && *valp != val) {
2455 if (valp != &IPV4_DEVCONF_DFLT(net, FORWARDING)) {
2456 if (!rtnl_trylock()) {
2457 /* Restore the original values before restarting */
2458 *valp = val;
2459 *ppos = pos;
2460 return restart_syscall();
2461 }
2462 if (valp == &IPV4_DEVCONF_ALL(net, FORWARDING)) {
2463 inet_forward_change(net);
2464 } else {
2465 struct ipv4_devconf *cnf = ctl->extra1;
2466 struct in_device *idev =
2467 container_of(cnf, struct in_device, cnf);
2468 if (*valp)
2469 dev_disable_lro(idev->dev);
2470 inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
2471 NETCONFA_FORWARDING,
2472 idev->dev->ifindex,
2473 cnf);
2474 }
2475 rtnl_unlock();
2476 rt_cache_flush(net);
2477 } else
2478 inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
2479 NETCONFA_FORWARDING,
2480 NETCONFA_IFINDEX_DEFAULT,
2481 net->ipv4.devconf_dflt);
2482 }
2483
2484 return ret;
2485}
2486
2487static int ipv4_doint_and_flush(struct ctl_table *ctl, int write,
2488 void *buffer, size_t *lenp, loff_t *ppos)
2489{
2490 int *valp = ctl->data;
2491 int val = *valp;
2492 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
2493 struct net *net = ctl->extra2;
2494
2495 if (write && *valp != val)
2496 rt_cache_flush(net);
2497
2498 return ret;
2499}
2500
2501#define DEVINET_SYSCTL_ENTRY(attr, name, mval, proc) \
2502 { \
2503 .procname = name, \
2504 .data = ipv4_devconf.data + \
2505 IPV4_DEVCONF_ ## attr - 1, \
2506 .maxlen = sizeof(int), \
2507 .mode = mval, \
2508 .proc_handler = proc, \
2509 .extra1 = &ipv4_devconf, \
2510 }
2511
2512#define DEVINET_SYSCTL_RW_ENTRY(attr, name) \
2513 DEVINET_SYSCTL_ENTRY(attr, name, 0644, devinet_conf_proc)
2514
2515#define DEVINET_SYSCTL_RO_ENTRY(attr, name) \
2516 DEVINET_SYSCTL_ENTRY(attr, name, 0444, devinet_conf_proc)
2517
2518#define DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, proc) \
2519 DEVINET_SYSCTL_ENTRY(attr, name, 0644, proc)
2520
2521#define DEVINET_SYSCTL_FLUSHING_ENTRY(attr, name) \
2522 DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, ipv4_doint_and_flush)
2523
2524static struct devinet_sysctl_table {
2525 struct ctl_table_header *sysctl_header;
2526 struct ctl_table devinet_vars[__IPV4_DEVCONF_MAX];
2527} devinet_sysctl = {
2528 .devinet_vars = {
2529 DEVINET_SYSCTL_COMPLEX_ENTRY(FORWARDING, "forwarding",
2530 devinet_sysctl_forward),
2531 DEVINET_SYSCTL_RO_ENTRY(MC_FORWARDING, "mc_forwarding"),
2532 DEVINET_SYSCTL_RW_ENTRY(BC_FORWARDING, "bc_forwarding"),
2533
2534 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_REDIRECTS, "accept_redirects"),
2535 DEVINET_SYSCTL_RW_ENTRY(SECURE_REDIRECTS, "secure_redirects"),
2536 DEVINET_SYSCTL_RW_ENTRY(SHARED_MEDIA, "shared_media"),
2537 DEVINET_SYSCTL_RW_ENTRY(RP_FILTER, "rp_filter"),
2538 DEVINET_SYSCTL_RW_ENTRY(SEND_REDIRECTS, "send_redirects"),
2539 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_SOURCE_ROUTE,
2540 "accept_source_route"),
2541 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_LOCAL, "accept_local"),
2542 DEVINET_SYSCTL_RW_ENTRY(SRC_VMARK, "src_valid_mark"),
2543 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP, "proxy_arp"),
2544 DEVINET_SYSCTL_RW_ENTRY(MEDIUM_ID, "medium_id"),
2545 DEVINET_SYSCTL_RW_ENTRY(BOOTP_RELAY, "bootp_relay"),
2546 DEVINET_SYSCTL_RW_ENTRY(LOG_MARTIANS, "log_martians"),
2547 DEVINET_SYSCTL_RW_ENTRY(TAG, "tag"),
2548 DEVINET_SYSCTL_RW_ENTRY(ARPFILTER, "arp_filter"),
2549 DEVINET_SYSCTL_RW_ENTRY(ARP_ANNOUNCE, "arp_announce"),
2550 DEVINET_SYSCTL_RW_ENTRY(ARP_IGNORE, "arp_ignore"),
2551 DEVINET_SYSCTL_RW_ENTRY(ARP_ACCEPT, "arp_accept"),
2552 DEVINET_SYSCTL_RW_ENTRY(ARP_NOTIFY, "arp_notify"),
2553 DEVINET_SYSCTL_RW_ENTRY(ARP_EVICT_NOCARRIER,
2554 "arp_evict_nocarrier"),
2555 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP_PVLAN, "proxy_arp_pvlan"),
2556 DEVINET_SYSCTL_RW_ENTRY(FORCE_IGMP_VERSION,
2557 "force_igmp_version"),
2558 DEVINET_SYSCTL_RW_ENTRY(IGMPV2_UNSOLICITED_REPORT_INTERVAL,
2559 "igmpv2_unsolicited_report_interval"),
2560 DEVINET_SYSCTL_RW_ENTRY(IGMPV3_UNSOLICITED_REPORT_INTERVAL,
2561 "igmpv3_unsolicited_report_interval"),
2562 DEVINET_SYSCTL_RW_ENTRY(IGNORE_ROUTES_WITH_LINKDOWN,
2563 "ignore_routes_with_linkdown"),
2564 DEVINET_SYSCTL_RW_ENTRY(DROP_GRATUITOUS_ARP,
2565 "drop_gratuitous_arp"),
2566
2567 DEVINET_SYSCTL_FLUSHING_ENTRY(NOXFRM, "disable_xfrm"),
2568 DEVINET_SYSCTL_FLUSHING_ENTRY(NOPOLICY, "disable_policy"),
2569 DEVINET_SYSCTL_FLUSHING_ENTRY(PROMOTE_SECONDARIES,
2570 "promote_secondaries"),
2571 DEVINET_SYSCTL_FLUSHING_ENTRY(ROUTE_LOCALNET,
2572 "route_localnet"),
2573 DEVINET_SYSCTL_FLUSHING_ENTRY(DROP_UNICAST_IN_L2_MULTICAST,
2574 "drop_unicast_in_l2_multicast"),
2575 },
2576};
2577
2578static int __devinet_sysctl_register(struct net *net, char *dev_name,
2579 int ifindex, struct ipv4_devconf *p)
2580{
2581 int i;
2582 struct devinet_sysctl_table *t;
2583 char path[sizeof("net/ipv4/conf/") + IFNAMSIZ];
2584
2585 t = kmemdup(&devinet_sysctl, sizeof(*t), GFP_KERNEL_ACCOUNT);
2586 if (!t)
2587 goto out;
2588
2589 for (i = 0; i < ARRAY_SIZE(t->devinet_vars) - 1; i++) {
2590 t->devinet_vars[i].data += (char *)p - (char *)&ipv4_devconf;
2591 t->devinet_vars[i].extra1 = p;
2592 t->devinet_vars[i].extra2 = net;
2593 }
2594
2595 snprintf(path, sizeof(path), "net/ipv4/conf/%s", dev_name);
2596
2597 t->sysctl_header = register_net_sysctl(net, path, t->devinet_vars);
2598 if (!t->sysctl_header)
2599 goto free;
2600
2601 p->sysctl = t;
2602
2603 inet_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
2604 ifindex, p);
2605 return 0;
2606
2607free:
2608 kfree(t);
2609out:
2610 return -ENOMEM;
2611}
2612
2613static void __devinet_sysctl_unregister(struct net *net,
2614 struct ipv4_devconf *cnf, int ifindex)
2615{
2616 struct devinet_sysctl_table *t = cnf->sysctl;
2617
2618 if (t) {
2619 cnf->sysctl = NULL;
2620 unregister_net_sysctl_table(t->sysctl_header);
2621 kfree(t);
2622 }
2623
2624 inet_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
2625}
2626
2627static int devinet_sysctl_register(struct in_device *idev)
2628{
2629 int err;
2630
2631 if (!sysctl_dev_name_is_allowed(idev->dev->name))
2632 return -EINVAL;
2633
2634 err = neigh_sysctl_register(idev->dev, idev->arp_parms, NULL);
2635 if (err)
2636 return err;
2637 err = __devinet_sysctl_register(dev_net(idev->dev), idev->dev->name,
2638 idev->dev->ifindex, &idev->cnf);
2639 if (err)
2640 neigh_sysctl_unregister(idev->arp_parms);
2641 return err;
2642}
2643
2644static void devinet_sysctl_unregister(struct in_device *idev)
2645{
2646 struct net *net = dev_net(idev->dev);
2647
2648 __devinet_sysctl_unregister(net, &idev->cnf, idev->dev->ifindex);
2649 neigh_sysctl_unregister(idev->arp_parms);
2650}
2651
2652static struct ctl_table ctl_forward_entry[] = {
2653 {
2654 .procname = "ip_forward",
2655 .data = &ipv4_devconf.data[
2656 IPV4_DEVCONF_FORWARDING - 1],
2657 .maxlen = sizeof(int),
2658 .mode = 0644,
2659 .proc_handler = devinet_sysctl_forward,
2660 .extra1 = &ipv4_devconf,
2661 .extra2 = &init_net,
2662 },
2663 { },
2664};
2665#endif
2666
2667static __net_init int devinet_init_net(struct net *net)
2668{
2669 int err;
2670 struct ipv4_devconf *all, *dflt;
2671#ifdef CONFIG_SYSCTL
2672 struct ctl_table *tbl;
2673 struct ctl_table_header *forw_hdr;
2674#endif
2675
2676 err = -ENOMEM;
2677 all = kmemdup(&ipv4_devconf, sizeof(ipv4_devconf), GFP_KERNEL);
2678 if (!all)
2679 goto err_alloc_all;
2680
2681 dflt = kmemdup(&ipv4_devconf_dflt, sizeof(ipv4_devconf_dflt), GFP_KERNEL);
2682 if (!dflt)
2683 goto err_alloc_dflt;
2684
2685#ifdef CONFIG_SYSCTL
2686 tbl = kmemdup(ctl_forward_entry, sizeof(ctl_forward_entry), GFP_KERNEL);
2687 if (!tbl)
2688 goto err_alloc_ctl;
2689
2690 tbl[0].data = &all->data[IPV4_DEVCONF_FORWARDING - 1];
2691 tbl[0].extra1 = all;
2692 tbl[0].extra2 = net;
2693#endif
2694
2695 if (!net_eq(net, &init_net)) {
2696 switch (net_inherit_devconf()) {
2697 case 3:
2698 /* copy from the current netns */
2699 memcpy(all, current->nsproxy->net_ns->ipv4.devconf_all,
2700 sizeof(ipv4_devconf));
2701 memcpy(dflt,
2702 current->nsproxy->net_ns->ipv4.devconf_dflt,
2703 sizeof(ipv4_devconf_dflt));
2704 break;
2705 case 0:
2706 case 1:
2707 /* copy from init_net */
2708 memcpy(all, init_net.ipv4.devconf_all,
2709 sizeof(ipv4_devconf));
2710 memcpy(dflt, init_net.ipv4.devconf_dflt,
2711 sizeof(ipv4_devconf_dflt));
2712 break;
2713 case 2:
2714 /* use compiled values */
2715 break;
2716 }
2717 }
2718
2719#ifdef CONFIG_SYSCTL
2720 err = __devinet_sysctl_register(net, "all", NETCONFA_IFINDEX_ALL, all);
2721 if (err < 0)
2722 goto err_reg_all;
2723
2724 err = __devinet_sysctl_register(net, "default",
2725 NETCONFA_IFINDEX_DEFAULT, dflt);
2726 if (err < 0)
2727 goto err_reg_dflt;
2728
2729 err = -ENOMEM;
2730 forw_hdr = register_net_sysctl_sz(net, "net/ipv4", tbl,
2731 ARRAY_SIZE(ctl_forward_entry));
2732 if (!forw_hdr)
2733 goto err_reg_ctl;
2734 net->ipv4.forw_hdr = forw_hdr;
2735#endif
2736
2737 net->ipv4.devconf_all = all;
2738 net->ipv4.devconf_dflt = dflt;
2739 return 0;
2740
2741#ifdef CONFIG_SYSCTL
2742err_reg_ctl:
2743 __devinet_sysctl_unregister(net, dflt, NETCONFA_IFINDEX_DEFAULT);
2744err_reg_dflt:
2745 __devinet_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL);
2746err_reg_all:
2747 kfree(tbl);
2748err_alloc_ctl:
2749#endif
2750 kfree(dflt);
2751err_alloc_dflt:
2752 kfree(all);
2753err_alloc_all:
2754 return err;
2755}
2756
2757static __net_exit void devinet_exit_net(struct net *net)
2758{
2759#ifdef CONFIG_SYSCTL
2760 struct ctl_table *tbl;
2761
2762 tbl = net->ipv4.forw_hdr->ctl_table_arg;
2763 unregister_net_sysctl_table(net->ipv4.forw_hdr);
2764 __devinet_sysctl_unregister(net, net->ipv4.devconf_dflt,
2765 NETCONFA_IFINDEX_DEFAULT);
2766 __devinet_sysctl_unregister(net, net->ipv4.devconf_all,
2767 NETCONFA_IFINDEX_ALL);
2768 kfree(tbl);
2769#endif
2770 kfree(net->ipv4.devconf_dflt);
2771 kfree(net->ipv4.devconf_all);
2772}
2773
2774static __net_initdata struct pernet_operations devinet_ops = {
2775 .init = devinet_init_net,
2776 .exit = devinet_exit_net,
2777};
2778
2779static struct rtnl_af_ops inet_af_ops __read_mostly = {
2780 .family = AF_INET,
2781 .fill_link_af = inet_fill_link_af,
2782 .get_link_af_size = inet_get_link_af_size,
2783 .validate_link_af = inet_validate_link_af,
2784 .set_link_af = inet_set_link_af,
2785};
2786
2787void __init devinet_init(void)
2788{
2789 int i;
2790
2791 for (i = 0; i < IN4_ADDR_HSIZE; i++)
2792 INIT_HLIST_HEAD(&inet_addr_lst[i]);
2793
2794 register_pernet_subsys(&devinet_ops);
2795 register_netdevice_notifier(&ip_netdev_notifier);
2796
2797 queue_delayed_work(system_power_efficient_wq, &check_lifetime_work, 0);
2798
2799 rtnl_af_register(&inet_af_ops);
2800
2801 rtnl_register(PF_INET, RTM_NEWADDR, inet_rtm_newaddr, NULL, 0);
2802 rtnl_register(PF_INET, RTM_DELADDR, inet_rtm_deladdr, NULL, 0);
2803 rtnl_register(PF_INET, RTM_GETADDR, NULL, inet_dump_ifaddr,
2804 RTNL_FLAG_DUMP_UNLOCKED);
2805 rtnl_register(PF_INET, RTM_GETNETCONF, inet_netconf_get_devconf,
2806 inet_netconf_dump_devconf,
2807 RTNL_FLAG_DOIT_UNLOCKED | RTNL_FLAG_DUMP_UNLOCKED);
2808}