Loading...
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 },
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 in_dev_put(in_dev);
280 in_dev = NULL;
281 goto out;
282 }
283 ip_mc_init_dev(in_dev);
284 if (dev->flags & IFF_UP)
285 ip_mc_up(in_dev);
286
287 /* we can receive as soon as ip_ptr is set -- do this last */
288 rcu_assign_pointer(dev->ip_ptr, in_dev);
289out:
290 return in_dev ?: ERR_PTR(err);
291out_kfree:
292 kfree(in_dev);
293 in_dev = NULL;
294 goto out;
295}
296
297static void in_dev_rcu_put(struct rcu_head *head)
298{
299 struct in_device *idev = container_of(head, struct in_device, rcu_head);
300 in_dev_put(idev);
301}
302
303static void inetdev_destroy(struct in_device *in_dev)
304{
305 struct net_device *dev;
306 struct in_ifaddr *ifa;
307
308 ASSERT_RTNL();
309
310 dev = in_dev->dev;
311
312 in_dev->dead = 1;
313
314 ip_mc_destroy_dev(in_dev);
315
316 while ((ifa = rtnl_dereference(in_dev->ifa_list)) != NULL) {
317 inet_del_ifa(in_dev, &in_dev->ifa_list, 0);
318 inet_free_ifa(ifa);
319 }
320
321 RCU_INIT_POINTER(dev->ip_ptr, NULL);
322
323 devinet_sysctl_unregister(in_dev);
324 neigh_parms_release(&arp_tbl, in_dev->arp_parms);
325 arp_ifdown(dev);
326
327 call_rcu(&in_dev->rcu_head, in_dev_rcu_put);
328}
329
330int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b)
331{
332 const struct in_ifaddr *ifa;
333
334 rcu_read_lock();
335 in_dev_for_each_ifa_rcu(ifa, in_dev) {
336 if (inet_ifa_match(a, ifa)) {
337 if (!b || inet_ifa_match(b, ifa)) {
338 rcu_read_unlock();
339 return 1;
340 }
341 }
342 }
343 rcu_read_unlock();
344 return 0;
345}
346
347static void __inet_del_ifa(struct in_device *in_dev,
348 struct in_ifaddr __rcu **ifap,
349 int destroy, struct nlmsghdr *nlh, u32 portid)
350{
351 struct in_ifaddr *promote = NULL;
352 struct in_ifaddr *ifa, *ifa1;
353 struct in_ifaddr *last_prim;
354 struct in_ifaddr *prev_prom = NULL;
355 int do_promote = IN_DEV_PROMOTE_SECONDARIES(in_dev);
356
357 ASSERT_RTNL();
358
359 ifa1 = rtnl_dereference(*ifap);
360 last_prim = rtnl_dereference(in_dev->ifa_list);
361 if (in_dev->dead)
362 goto no_promotions;
363
364 /* 1. Deleting primary ifaddr forces deletion all secondaries
365 * unless alias promotion is set
366 **/
367
368 if (!(ifa1->ifa_flags & IFA_F_SECONDARY)) {
369 struct in_ifaddr __rcu **ifap1 = &ifa1->ifa_next;
370
371 while ((ifa = rtnl_dereference(*ifap1)) != NULL) {
372 if (!(ifa->ifa_flags & IFA_F_SECONDARY) &&
373 ifa1->ifa_scope <= ifa->ifa_scope)
374 last_prim = ifa;
375
376 if (!(ifa->ifa_flags & IFA_F_SECONDARY) ||
377 ifa1->ifa_mask != ifa->ifa_mask ||
378 !inet_ifa_match(ifa1->ifa_address, ifa)) {
379 ifap1 = &ifa->ifa_next;
380 prev_prom = ifa;
381 continue;
382 }
383
384 if (!do_promote) {
385 inet_hash_remove(ifa);
386 *ifap1 = ifa->ifa_next;
387
388 rtmsg_ifa(RTM_DELADDR, ifa, nlh, portid);
389 blocking_notifier_call_chain(&inetaddr_chain,
390 NETDEV_DOWN, ifa);
391 inet_free_ifa(ifa);
392 } else {
393 promote = ifa;
394 break;
395 }
396 }
397 }
398
399 /* On promotion all secondaries from subnet are changing
400 * the primary IP, we must remove all their routes silently
401 * and later to add them back with new prefsrc. Do this
402 * while all addresses are on the device list.
403 */
404 for (ifa = promote; ifa; ifa = rtnl_dereference(ifa->ifa_next)) {
405 if (ifa1->ifa_mask == ifa->ifa_mask &&
406 inet_ifa_match(ifa1->ifa_address, ifa))
407 fib_del_ifaddr(ifa, ifa1);
408 }
409
410no_promotions:
411 /* 2. Unlink it */
412
413 *ifap = ifa1->ifa_next;
414 inet_hash_remove(ifa1);
415
416 /* 3. Announce address deletion */
417
418 /* Send message first, then call notifier.
419 At first sight, FIB update triggered by notifier
420 will refer to already deleted ifaddr, that could confuse
421 netlink listeners. It is not true: look, gated sees
422 that route deleted and if it still thinks that ifaddr
423 is valid, it will try to restore deleted routes... Grr.
424 So that, this order is correct.
425 */
426 rtmsg_ifa(RTM_DELADDR, ifa1, nlh, portid);
427 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa1);
428
429 if (promote) {
430 struct in_ifaddr *next_sec;
431
432 next_sec = rtnl_dereference(promote->ifa_next);
433 if (prev_prom) {
434 struct in_ifaddr *last_sec;
435
436 rcu_assign_pointer(prev_prom->ifa_next, next_sec);
437
438 last_sec = rtnl_dereference(last_prim->ifa_next);
439 rcu_assign_pointer(promote->ifa_next, last_sec);
440 rcu_assign_pointer(last_prim->ifa_next, promote);
441 }
442
443 promote->ifa_flags &= ~IFA_F_SECONDARY;
444 rtmsg_ifa(RTM_NEWADDR, promote, nlh, portid);
445 blocking_notifier_call_chain(&inetaddr_chain,
446 NETDEV_UP, promote);
447 for (ifa = next_sec; ifa;
448 ifa = rtnl_dereference(ifa->ifa_next)) {
449 if (ifa1->ifa_mask != ifa->ifa_mask ||
450 !inet_ifa_match(ifa1->ifa_address, ifa))
451 continue;
452 fib_add_ifaddr(ifa);
453 }
454
455 }
456 if (destroy)
457 inet_free_ifa(ifa1);
458}
459
460static void inet_del_ifa(struct in_device *in_dev,
461 struct in_ifaddr __rcu **ifap,
462 int destroy)
463{
464 __inet_del_ifa(in_dev, ifap, destroy, NULL, 0);
465}
466
467static void check_lifetime(struct work_struct *work);
468
469static DECLARE_DELAYED_WORK(check_lifetime_work, check_lifetime);
470
471static int __inet_insert_ifa(struct in_ifaddr *ifa, struct nlmsghdr *nlh,
472 u32 portid, struct netlink_ext_ack *extack)
473{
474 struct in_ifaddr __rcu **last_primary, **ifap;
475 struct in_device *in_dev = ifa->ifa_dev;
476 struct in_validator_info ivi;
477 struct in_ifaddr *ifa1;
478 int ret;
479
480 ASSERT_RTNL();
481
482 if (!ifa->ifa_local) {
483 inet_free_ifa(ifa);
484 return 0;
485 }
486
487 ifa->ifa_flags &= ~IFA_F_SECONDARY;
488 last_primary = &in_dev->ifa_list;
489
490 /* Don't set IPv6 only flags to IPv4 addresses */
491 ifa->ifa_flags &= ~IPV6ONLY_FLAGS;
492
493 ifap = &in_dev->ifa_list;
494 ifa1 = rtnl_dereference(*ifap);
495
496 while (ifa1) {
497 if (!(ifa1->ifa_flags & IFA_F_SECONDARY) &&
498 ifa->ifa_scope <= ifa1->ifa_scope)
499 last_primary = &ifa1->ifa_next;
500 if (ifa1->ifa_mask == ifa->ifa_mask &&
501 inet_ifa_match(ifa1->ifa_address, ifa)) {
502 if (ifa1->ifa_local == ifa->ifa_local) {
503 inet_free_ifa(ifa);
504 return -EEXIST;
505 }
506 if (ifa1->ifa_scope != ifa->ifa_scope) {
507 inet_free_ifa(ifa);
508 return -EINVAL;
509 }
510 ifa->ifa_flags |= IFA_F_SECONDARY;
511 }
512
513 ifap = &ifa1->ifa_next;
514 ifa1 = rtnl_dereference(*ifap);
515 }
516
517 /* Allow any devices that wish to register ifaddr validtors to weigh
518 * in now, before changes are committed. The rntl lock is serializing
519 * access here, so the state should not change between a validator call
520 * and a final notify on commit. This isn't invoked on promotion under
521 * the assumption that validators are checking the address itself, and
522 * not the flags.
523 */
524 ivi.ivi_addr = ifa->ifa_address;
525 ivi.ivi_dev = ifa->ifa_dev;
526 ivi.extack = extack;
527 ret = blocking_notifier_call_chain(&inetaddr_validator_chain,
528 NETDEV_UP, &ivi);
529 ret = notifier_to_errno(ret);
530 if (ret) {
531 inet_free_ifa(ifa);
532 return ret;
533 }
534
535 if (!(ifa->ifa_flags & IFA_F_SECONDARY)) {
536 prandom_seed((__force u32) ifa->ifa_local);
537 ifap = last_primary;
538 }
539
540 rcu_assign_pointer(ifa->ifa_next, *ifap);
541 rcu_assign_pointer(*ifap, ifa);
542
543 inet_hash_insert(dev_net(in_dev->dev), ifa);
544
545 cancel_delayed_work(&check_lifetime_work);
546 queue_delayed_work(system_power_efficient_wq, &check_lifetime_work, 0);
547
548 /* Send message first, then call notifier.
549 Notifier will trigger FIB update, so that
550 listeners of netlink will know about new ifaddr */
551 rtmsg_ifa(RTM_NEWADDR, ifa, nlh, portid);
552 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa);
553
554 return 0;
555}
556
557static int inet_insert_ifa(struct in_ifaddr *ifa)
558{
559 return __inet_insert_ifa(ifa, NULL, 0, NULL);
560}
561
562static int inet_set_ifa(struct net_device *dev, struct in_ifaddr *ifa)
563{
564 struct in_device *in_dev = __in_dev_get_rtnl(dev);
565
566 ASSERT_RTNL();
567
568 if (!in_dev) {
569 inet_free_ifa(ifa);
570 return -ENOBUFS;
571 }
572 ipv4_devconf_setall(in_dev);
573 neigh_parms_data_state_setall(in_dev->arp_parms);
574 if (ifa->ifa_dev != in_dev) {
575 WARN_ON(ifa->ifa_dev);
576 in_dev_hold(in_dev);
577 ifa->ifa_dev = in_dev;
578 }
579 if (ipv4_is_loopback(ifa->ifa_local))
580 ifa->ifa_scope = RT_SCOPE_HOST;
581 return inet_insert_ifa(ifa);
582}
583
584/* Caller must hold RCU or RTNL :
585 * We dont take a reference on found in_device
586 */
587struct in_device *inetdev_by_index(struct net *net, int ifindex)
588{
589 struct net_device *dev;
590 struct in_device *in_dev = NULL;
591
592 rcu_read_lock();
593 dev = dev_get_by_index_rcu(net, ifindex);
594 if (dev)
595 in_dev = rcu_dereference_rtnl(dev->ip_ptr);
596 rcu_read_unlock();
597 return in_dev;
598}
599EXPORT_SYMBOL(inetdev_by_index);
600
601/* Called only from RTNL semaphored context. No locks. */
602
603struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix,
604 __be32 mask)
605{
606 struct in_ifaddr *ifa;
607
608 ASSERT_RTNL();
609
610 in_dev_for_each_ifa_rtnl(ifa, in_dev) {
611 if (ifa->ifa_mask == mask && inet_ifa_match(prefix, ifa))
612 return ifa;
613 }
614 return NULL;
615}
616
617static int ip_mc_config(struct sock *sk, bool join, const struct in_ifaddr *ifa)
618{
619 struct ip_mreqn mreq = {
620 .imr_multiaddr.s_addr = ifa->ifa_address,
621 .imr_ifindex = ifa->ifa_dev->dev->ifindex,
622 };
623 int ret;
624
625 ASSERT_RTNL();
626
627 lock_sock(sk);
628 if (join)
629 ret = ip_mc_join_group(sk, &mreq);
630 else
631 ret = ip_mc_leave_group(sk, &mreq);
632 release_sock(sk);
633
634 return ret;
635}
636
637static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
638 struct netlink_ext_ack *extack)
639{
640 struct net *net = sock_net(skb->sk);
641 struct in_ifaddr __rcu **ifap;
642 struct nlattr *tb[IFA_MAX+1];
643 struct in_device *in_dev;
644 struct ifaddrmsg *ifm;
645 struct in_ifaddr *ifa;
646
647 int err = -EINVAL;
648
649 ASSERT_RTNL();
650
651 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
652 ifa_ipv4_policy, extack);
653 if (err < 0)
654 goto errout;
655
656 ifm = nlmsg_data(nlh);
657 in_dev = inetdev_by_index(net, ifm->ifa_index);
658 if (!in_dev) {
659 err = -ENODEV;
660 goto errout;
661 }
662
663 for (ifap = &in_dev->ifa_list; (ifa = rtnl_dereference(*ifap)) != NULL;
664 ifap = &ifa->ifa_next) {
665 if (tb[IFA_LOCAL] &&
666 ifa->ifa_local != nla_get_in_addr(tb[IFA_LOCAL]))
667 continue;
668
669 if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label))
670 continue;
671
672 if (tb[IFA_ADDRESS] &&
673 (ifm->ifa_prefixlen != ifa->ifa_prefixlen ||
674 !inet_ifa_match(nla_get_in_addr(tb[IFA_ADDRESS]), ifa)))
675 continue;
676
677 if (ipv4_is_multicast(ifa->ifa_address))
678 ip_mc_config(net->ipv4.mc_autojoin_sk, false, ifa);
679 __inet_del_ifa(in_dev, ifap, 1, nlh, NETLINK_CB(skb).portid);
680 return 0;
681 }
682
683 err = -EADDRNOTAVAIL;
684errout:
685 return err;
686}
687
688#define INFINITY_LIFE_TIME 0xFFFFFFFF
689
690static void check_lifetime(struct work_struct *work)
691{
692 unsigned long now, next, next_sec, next_sched;
693 struct in_ifaddr *ifa;
694 struct hlist_node *n;
695 int i;
696
697 now = jiffies;
698 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
699
700 for (i = 0; i < IN4_ADDR_HSIZE; i++) {
701 bool change_needed = false;
702
703 rcu_read_lock();
704 hlist_for_each_entry_rcu(ifa, &inet_addr_lst[i], hash) {
705 unsigned long age;
706
707 if (ifa->ifa_flags & IFA_F_PERMANENT)
708 continue;
709
710 /* We try to batch several events at once. */
711 age = (now - ifa->ifa_tstamp +
712 ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
713
714 if (ifa->ifa_valid_lft != INFINITY_LIFE_TIME &&
715 age >= ifa->ifa_valid_lft) {
716 change_needed = true;
717 } else if (ifa->ifa_preferred_lft ==
718 INFINITY_LIFE_TIME) {
719 continue;
720 } else if (age >= ifa->ifa_preferred_lft) {
721 if (time_before(ifa->ifa_tstamp +
722 ifa->ifa_valid_lft * HZ, next))
723 next = ifa->ifa_tstamp +
724 ifa->ifa_valid_lft * HZ;
725
726 if (!(ifa->ifa_flags & IFA_F_DEPRECATED))
727 change_needed = true;
728 } else if (time_before(ifa->ifa_tstamp +
729 ifa->ifa_preferred_lft * HZ,
730 next)) {
731 next = ifa->ifa_tstamp +
732 ifa->ifa_preferred_lft * HZ;
733 }
734 }
735 rcu_read_unlock();
736 if (!change_needed)
737 continue;
738 rtnl_lock();
739 hlist_for_each_entry_safe(ifa, n, &inet_addr_lst[i], hash) {
740 unsigned long age;
741
742 if (ifa->ifa_flags & IFA_F_PERMANENT)
743 continue;
744
745 /* We try to batch several events at once. */
746 age = (now - ifa->ifa_tstamp +
747 ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
748
749 if (ifa->ifa_valid_lft != INFINITY_LIFE_TIME &&
750 age >= ifa->ifa_valid_lft) {
751 struct in_ifaddr __rcu **ifap;
752 struct in_ifaddr *tmp;
753
754 ifap = &ifa->ifa_dev->ifa_list;
755 tmp = rtnl_dereference(*ifap);
756 while (tmp) {
757 if (tmp == ifa) {
758 inet_del_ifa(ifa->ifa_dev,
759 ifap, 1);
760 break;
761 }
762 ifap = &tmp->ifa_next;
763 tmp = rtnl_dereference(*ifap);
764 }
765 } else if (ifa->ifa_preferred_lft !=
766 INFINITY_LIFE_TIME &&
767 age >= ifa->ifa_preferred_lft &&
768 !(ifa->ifa_flags & IFA_F_DEPRECATED)) {
769 ifa->ifa_flags |= IFA_F_DEPRECATED;
770 rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0);
771 }
772 }
773 rtnl_unlock();
774 }
775
776 next_sec = round_jiffies_up(next);
777 next_sched = next;
778
779 /* If rounded timeout is accurate enough, accept it. */
780 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
781 next_sched = next_sec;
782
783 now = jiffies;
784 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
785 if (time_before(next_sched, now + ADDRCONF_TIMER_FUZZ_MAX))
786 next_sched = now + ADDRCONF_TIMER_FUZZ_MAX;
787
788 queue_delayed_work(system_power_efficient_wq, &check_lifetime_work,
789 next_sched - now);
790}
791
792static void set_ifa_lifetime(struct in_ifaddr *ifa, __u32 valid_lft,
793 __u32 prefered_lft)
794{
795 unsigned long timeout;
796
797 ifa->ifa_flags &= ~(IFA_F_PERMANENT | IFA_F_DEPRECATED);
798
799 timeout = addrconf_timeout_fixup(valid_lft, HZ);
800 if (addrconf_finite_timeout(timeout))
801 ifa->ifa_valid_lft = timeout;
802 else
803 ifa->ifa_flags |= IFA_F_PERMANENT;
804
805 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
806 if (addrconf_finite_timeout(timeout)) {
807 if (timeout == 0)
808 ifa->ifa_flags |= IFA_F_DEPRECATED;
809 ifa->ifa_preferred_lft = timeout;
810 }
811 ifa->ifa_tstamp = jiffies;
812 if (!ifa->ifa_cstamp)
813 ifa->ifa_cstamp = ifa->ifa_tstamp;
814}
815
816static struct in_ifaddr *rtm_to_ifaddr(struct net *net, struct nlmsghdr *nlh,
817 __u32 *pvalid_lft, __u32 *pprefered_lft,
818 struct netlink_ext_ack *extack)
819{
820 struct nlattr *tb[IFA_MAX+1];
821 struct in_ifaddr *ifa;
822 struct ifaddrmsg *ifm;
823 struct net_device *dev;
824 struct in_device *in_dev;
825 int err;
826
827 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
828 ifa_ipv4_policy, extack);
829 if (err < 0)
830 goto errout;
831
832 ifm = nlmsg_data(nlh);
833 err = -EINVAL;
834 if (ifm->ifa_prefixlen > 32 || !tb[IFA_LOCAL])
835 goto errout;
836
837 dev = __dev_get_by_index(net, ifm->ifa_index);
838 err = -ENODEV;
839 if (!dev)
840 goto errout;
841
842 in_dev = __in_dev_get_rtnl(dev);
843 err = -ENOBUFS;
844 if (!in_dev)
845 goto errout;
846
847 ifa = inet_alloc_ifa();
848 if (!ifa)
849 /*
850 * A potential indev allocation can be left alive, it stays
851 * assigned to its device and is destroy with it.
852 */
853 goto errout;
854
855 ipv4_devconf_setall(in_dev);
856 neigh_parms_data_state_setall(in_dev->arp_parms);
857 in_dev_hold(in_dev);
858
859 if (!tb[IFA_ADDRESS])
860 tb[IFA_ADDRESS] = tb[IFA_LOCAL];
861
862 INIT_HLIST_NODE(&ifa->hash);
863 ifa->ifa_prefixlen = ifm->ifa_prefixlen;
864 ifa->ifa_mask = inet_make_mask(ifm->ifa_prefixlen);
865 ifa->ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) :
866 ifm->ifa_flags;
867 ifa->ifa_scope = ifm->ifa_scope;
868 ifa->ifa_dev = in_dev;
869
870 ifa->ifa_local = nla_get_in_addr(tb[IFA_LOCAL]);
871 ifa->ifa_address = nla_get_in_addr(tb[IFA_ADDRESS]);
872
873 if (tb[IFA_BROADCAST])
874 ifa->ifa_broadcast = nla_get_in_addr(tb[IFA_BROADCAST]);
875
876 if (tb[IFA_LABEL])
877 nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ);
878 else
879 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
880
881 if (tb[IFA_RT_PRIORITY])
882 ifa->ifa_rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]);
883
884 if (tb[IFA_CACHEINFO]) {
885 struct ifa_cacheinfo *ci;
886
887 ci = nla_data(tb[IFA_CACHEINFO]);
888 if (!ci->ifa_valid || ci->ifa_prefered > ci->ifa_valid) {
889 err = -EINVAL;
890 goto errout_free;
891 }
892 *pvalid_lft = ci->ifa_valid;
893 *pprefered_lft = ci->ifa_prefered;
894 }
895
896 return ifa;
897
898errout_free:
899 inet_free_ifa(ifa);
900errout:
901 return ERR_PTR(err);
902}
903
904static struct in_ifaddr *find_matching_ifa(struct in_ifaddr *ifa)
905{
906 struct in_device *in_dev = ifa->ifa_dev;
907 struct in_ifaddr *ifa1;
908
909 if (!ifa->ifa_local)
910 return NULL;
911
912 in_dev_for_each_ifa_rtnl(ifa1, in_dev) {
913 if (ifa1->ifa_mask == ifa->ifa_mask &&
914 inet_ifa_match(ifa1->ifa_address, ifa) &&
915 ifa1->ifa_local == ifa->ifa_local)
916 return ifa1;
917 }
918 return NULL;
919}
920
921static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
922 struct netlink_ext_ack *extack)
923{
924 struct net *net = sock_net(skb->sk);
925 struct in_ifaddr *ifa;
926 struct in_ifaddr *ifa_existing;
927 __u32 valid_lft = INFINITY_LIFE_TIME;
928 __u32 prefered_lft = INFINITY_LIFE_TIME;
929
930 ASSERT_RTNL();
931
932 ifa = rtm_to_ifaddr(net, nlh, &valid_lft, &prefered_lft, extack);
933 if (IS_ERR(ifa))
934 return PTR_ERR(ifa);
935
936 ifa_existing = find_matching_ifa(ifa);
937 if (!ifa_existing) {
938 /* It would be best to check for !NLM_F_CREATE here but
939 * userspace already relies on not having to provide this.
940 */
941 set_ifa_lifetime(ifa, valid_lft, prefered_lft);
942 if (ifa->ifa_flags & IFA_F_MCAUTOJOIN) {
943 int ret = ip_mc_config(net->ipv4.mc_autojoin_sk,
944 true, ifa);
945
946 if (ret < 0) {
947 inet_free_ifa(ifa);
948 return ret;
949 }
950 }
951 return __inet_insert_ifa(ifa, nlh, NETLINK_CB(skb).portid,
952 extack);
953 } else {
954 u32 new_metric = ifa->ifa_rt_priority;
955
956 inet_free_ifa(ifa);
957
958 if (nlh->nlmsg_flags & NLM_F_EXCL ||
959 !(nlh->nlmsg_flags & NLM_F_REPLACE))
960 return -EEXIST;
961 ifa = ifa_existing;
962
963 if (ifa->ifa_rt_priority != new_metric) {
964 fib_modify_prefix_metric(ifa, new_metric);
965 ifa->ifa_rt_priority = new_metric;
966 }
967
968 set_ifa_lifetime(ifa, valid_lft, prefered_lft);
969 cancel_delayed_work(&check_lifetime_work);
970 queue_delayed_work(system_power_efficient_wq,
971 &check_lifetime_work, 0);
972 rtmsg_ifa(RTM_NEWADDR, ifa, nlh, NETLINK_CB(skb).portid);
973 }
974 return 0;
975}
976
977/*
978 * Determine a default network mask, based on the IP address.
979 */
980
981static int inet_abc_len(__be32 addr)
982{
983 int rc = -1; /* Something else, probably a multicast. */
984
985 if (ipv4_is_zeronet(addr) || ipv4_is_lbcast(addr))
986 rc = 0;
987 else {
988 __u32 haddr = ntohl(addr);
989 if (IN_CLASSA(haddr))
990 rc = 8;
991 else if (IN_CLASSB(haddr))
992 rc = 16;
993 else if (IN_CLASSC(haddr))
994 rc = 24;
995 else if (IN_CLASSE(haddr))
996 rc = 32;
997 }
998
999 return rc;
1000}
1001
1002
1003int devinet_ioctl(struct net *net, unsigned int cmd, struct ifreq *ifr)
1004{
1005 struct sockaddr_in sin_orig;
1006 struct sockaddr_in *sin = (struct sockaddr_in *)&ifr->ifr_addr;
1007 struct in_ifaddr __rcu **ifap = NULL;
1008 struct in_device *in_dev;
1009 struct in_ifaddr *ifa = NULL;
1010 struct net_device *dev;
1011 char *colon;
1012 int ret = -EFAULT;
1013 int tryaddrmatch = 0;
1014
1015 ifr->ifr_name[IFNAMSIZ - 1] = 0;
1016
1017 /* save original address for comparison */
1018 memcpy(&sin_orig, sin, sizeof(*sin));
1019
1020 colon = strchr(ifr->ifr_name, ':');
1021 if (colon)
1022 *colon = 0;
1023
1024 dev_load(net, ifr->ifr_name);
1025
1026 switch (cmd) {
1027 case SIOCGIFADDR: /* Get interface address */
1028 case SIOCGIFBRDADDR: /* Get the broadcast address */
1029 case SIOCGIFDSTADDR: /* Get the destination address */
1030 case SIOCGIFNETMASK: /* Get the netmask for the interface */
1031 /* Note that these ioctls will not sleep,
1032 so that we do not impose a lock.
1033 One day we will be forced to put shlock here (I mean SMP)
1034 */
1035 tryaddrmatch = (sin_orig.sin_family == AF_INET);
1036 memset(sin, 0, sizeof(*sin));
1037 sin->sin_family = AF_INET;
1038 break;
1039
1040 case SIOCSIFFLAGS:
1041 ret = -EPERM;
1042 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1043 goto out;
1044 break;
1045 case SIOCSIFADDR: /* Set interface address (and family) */
1046 case SIOCSIFBRDADDR: /* Set the broadcast address */
1047 case SIOCSIFDSTADDR: /* Set the destination address */
1048 case SIOCSIFNETMASK: /* Set the netmask for the interface */
1049 ret = -EPERM;
1050 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1051 goto out;
1052 ret = -EINVAL;
1053 if (sin->sin_family != AF_INET)
1054 goto out;
1055 break;
1056 default:
1057 ret = -EINVAL;
1058 goto out;
1059 }
1060
1061 rtnl_lock();
1062
1063 ret = -ENODEV;
1064 dev = __dev_get_by_name(net, ifr->ifr_name);
1065 if (!dev)
1066 goto done;
1067
1068 if (colon)
1069 *colon = ':';
1070
1071 in_dev = __in_dev_get_rtnl(dev);
1072 if (in_dev) {
1073 if (tryaddrmatch) {
1074 /* Matthias Andree */
1075 /* compare label and address (4.4BSD style) */
1076 /* note: we only do this for a limited set of ioctls
1077 and only if the original address family was AF_INET.
1078 This is checked above. */
1079
1080 for (ifap = &in_dev->ifa_list;
1081 (ifa = rtnl_dereference(*ifap)) != NULL;
1082 ifap = &ifa->ifa_next) {
1083 if (!strcmp(ifr->ifr_name, ifa->ifa_label) &&
1084 sin_orig.sin_addr.s_addr ==
1085 ifa->ifa_local) {
1086 break; /* found */
1087 }
1088 }
1089 }
1090 /* we didn't get a match, maybe the application is
1091 4.3BSD-style and passed in junk so we fall back to
1092 comparing just the label */
1093 if (!ifa) {
1094 for (ifap = &in_dev->ifa_list;
1095 (ifa = rtnl_dereference(*ifap)) != NULL;
1096 ifap = &ifa->ifa_next)
1097 if (!strcmp(ifr->ifr_name, ifa->ifa_label))
1098 break;
1099 }
1100 }
1101
1102 ret = -EADDRNOTAVAIL;
1103 if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS)
1104 goto done;
1105
1106 switch (cmd) {
1107 case SIOCGIFADDR: /* Get interface address */
1108 ret = 0;
1109 sin->sin_addr.s_addr = ifa->ifa_local;
1110 break;
1111
1112 case SIOCGIFBRDADDR: /* Get the broadcast address */
1113 ret = 0;
1114 sin->sin_addr.s_addr = ifa->ifa_broadcast;
1115 break;
1116
1117 case SIOCGIFDSTADDR: /* Get the destination address */
1118 ret = 0;
1119 sin->sin_addr.s_addr = ifa->ifa_address;
1120 break;
1121
1122 case SIOCGIFNETMASK: /* Get the netmask for the interface */
1123 ret = 0;
1124 sin->sin_addr.s_addr = ifa->ifa_mask;
1125 break;
1126
1127 case SIOCSIFFLAGS:
1128 if (colon) {
1129 ret = -EADDRNOTAVAIL;
1130 if (!ifa)
1131 break;
1132 ret = 0;
1133 if (!(ifr->ifr_flags & IFF_UP))
1134 inet_del_ifa(in_dev, ifap, 1);
1135 break;
1136 }
1137 ret = dev_change_flags(dev, ifr->ifr_flags, NULL);
1138 break;
1139
1140 case SIOCSIFADDR: /* Set interface address (and family) */
1141 ret = -EINVAL;
1142 if (inet_abc_len(sin->sin_addr.s_addr) < 0)
1143 break;
1144
1145 if (!ifa) {
1146 ret = -ENOBUFS;
1147 ifa = inet_alloc_ifa();
1148 if (!ifa)
1149 break;
1150 INIT_HLIST_NODE(&ifa->hash);
1151 if (colon)
1152 memcpy(ifa->ifa_label, ifr->ifr_name, IFNAMSIZ);
1153 else
1154 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1155 } else {
1156 ret = 0;
1157 if (ifa->ifa_local == sin->sin_addr.s_addr)
1158 break;
1159 inet_del_ifa(in_dev, ifap, 0);
1160 ifa->ifa_broadcast = 0;
1161 ifa->ifa_scope = 0;
1162 }
1163
1164 ifa->ifa_address = ifa->ifa_local = sin->sin_addr.s_addr;
1165
1166 if (!(dev->flags & IFF_POINTOPOINT)) {
1167 ifa->ifa_prefixlen = inet_abc_len(ifa->ifa_address);
1168 ifa->ifa_mask = inet_make_mask(ifa->ifa_prefixlen);
1169 if ((dev->flags & IFF_BROADCAST) &&
1170 ifa->ifa_prefixlen < 31)
1171 ifa->ifa_broadcast = ifa->ifa_address |
1172 ~ifa->ifa_mask;
1173 } else {
1174 ifa->ifa_prefixlen = 32;
1175 ifa->ifa_mask = inet_make_mask(32);
1176 }
1177 set_ifa_lifetime(ifa, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1178 ret = inet_set_ifa(dev, ifa);
1179 break;
1180
1181 case SIOCSIFBRDADDR: /* Set the broadcast address */
1182 ret = 0;
1183 if (ifa->ifa_broadcast != sin->sin_addr.s_addr) {
1184 inet_del_ifa(in_dev, ifap, 0);
1185 ifa->ifa_broadcast = sin->sin_addr.s_addr;
1186 inet_insert_ifa(ifa);
1187 }
1188 break;
1189
1190 case SIOCSIFDSTADDR: /* Set the destination address */
1191 ret = 0;
1192 if (ifa->ifa_address == sin->sin_addr.s_addr)
1193 break;
1194 ret = -EINVAL;
1195 if (inet_abc_len(sin->sin_addr.s_addr) < 0)
1196 break;
1197 ret = 0;
1198 inet_del_ifa(in_dev, ifap, 0);
1199 ifa->ifa_address = sin->sin_addr.s_addr;
1200 inet_insert_ifa(ifa);
1201 break;
1202
1203 case SIOCSIFNETMASK: /* Set the netmask for the interface */
1204
1205 /*
1206 * The mask we set must be legal.
1207 */
1208 ret = -EINVAL;
1209 if (bad_mask(sin->sin_addr.s_addr, 0))
1210 break;
1211 ret = 0;
1212 if (ifa->ifa_mask != sin->sin_addr.s_addr) {
1213 __be32 old_mask = ifa->ifa_mask;
1214 inet_del_ifa(in_dev, ifap, 0);
1215 ifa->ifa_mask = sin->sin_addr.s_addr;
1216 ifa->ifa_prefixlen = inet_mask_len(ifa->ifa_mask);
1217
1218 /* See if current broadcast address matches
1219 * with current netmask, then recalculate
1220 * the broadcast address. Otherwise it's a
1221 * funny address, so don't touch it since
1222 * the user seems to know what (s)he's doing...
1223 */
1224 if ((dev->flags & IFF_BROADCAST) &&
1225 (ifa->ifa_prefixlen < 31) &&
1226 (ifa->ifa_broadcast ==
1227 (ifa->ifa_local|~old_mask))) {
1228 ifa->ifa_broadcast = (ifa->ifa_local |
1229 ~sin->sin_addr.s_addr);
1230 }
1231 inet_insert_ifa(ifa);
1232 }
1233 break;
1234 }
1235done:
1236 rtnl_unlock();
1237out:
1238 return ret;
1239}
1240
1241static int inet_gifconf(struct net_device *dev, char __user *buf, int len, int size)
1242{
1243 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1244 const struct in_ifaddr *ifa;
1245 struct ifreq ifr;
1246 int done = 0;
1247
1248 if (WARN_ON(size > sizeof(struct ifreq)))
1249 goto out;
1250
1251 if (!in_dev)
1252 goto out;
1253
1254 in_dev_for_each_ifa_rtnl(ifa, in_dev) {
1255 if (!buf) {
1256 done += size;
1257 continue;
1258 }
1259 if (len < size)
1260 break;
1261 memset(&ifr, 0, sizeof(struct ifreq));
1262 strcpy(ifr.ifr_name, ifa->ifa_label);
1263
1264 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_family = AF_INET;
1265 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_addr.s_addr =
1266 ifa->ifa_local;
1267
1268 if (copy_to_user(buf + done, &ifr, size)) {
1269 done = -EFAULT;
1270 break;
1271 }
1272 len -= size;
1273 done += size;
1274 }
1275out:
1276 return done;
1277}
1278
1279static __be32 in_dev_select_addr(const struct in_device *in_dev,
1280 int scope)
1281{
1282 const struct in_ifaddr *ifa;
1283
1284 in_dev_for_each_ifa_rcu(ifa, in_dev) {
1285 if (ifa->ifa_flags & IFA_F_SECONDARY)
1286 continue;
1287 if (ifa->ifa_scope != RT_SCOPE_LINK &&
1288 ifa->ifa_scope <= scope)
1289 return ifa->ifa_local;
1290 }
1291
1292 return 0;
1293}
1294
1295__be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope)
1296{
1297 const struct in_ifaddr *ifa;
1298 __be32 addr = 0;
1299 unsigned char localnet_scope = RT_SCOPE_HOST;
1300 struct in_device *in_dev;
1301 struct net *net = dev_net(dev);
1302 int master_idx;
1303
1304 rcu_read_lock();
1305 in_dev = __in_dev_get_rcu(dev);
1306 if (!in_dev)
1307 goto no_in_dev;
1308
1309 if (unlikely(IN_DEV_ROUTE_LOCALNET(in_dev)))
1310 localnet_scope = RT_SCOPE_LINK;
1311
1312 in_dev_for_each_ifa_rcu(ifa, in_dev) {
1313 if (ifa->ifa_flags & IFA_F_SECONDARY)
1314 continue;
1315 if (min(ifa->ifa_scope, localnet_scope) > scope)
1316 continue;
1317 if (!dst || inet_ifa_match(dst, ifa)) {
1318 addr = ifa->ifa_local;
1319 break;
1320 }
1321 if (!addr)
1322 addr = ifa->ifa_local;
1323 }
1324
1325 if (addr)
1326 goto out_unlock;
1327no_in_dev:
1328 master_idx = l3mdev_master_ifindex_rcu(dev);
1329
1330 /* For VRFs, the VRF device takes the place of the loopback device,
1331 * with addresses on it being preferred. Note in such cases the
1332 * loopback device will be among the devices that fail the master_idx
1333 * equality check in the loop below.
1334 */
1335 if (master_idx &&
1336 (dev = dev_get_by_index_rcu(net, master_idx)) &&
1337 (in_dev = __in_dev_get_rcu(dev))) {
1338 addr = in_dev_select_addr(in_dev, scope);
1339 if (addr)
1340 goto out_unlock;
1341 }
1342
1343 /* Not loopback addresses on loopback should be preferred
1344 in this case. It is important that lo is the first interface
1345 in dev_base list.
1346 */
1347 for_each_netdev_rcu(net, dev) {
1348 if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1349 continue;
1350
1351 in_dev = __in_dev_get_rcu(dev);
1352 if (!in_dev)
1353 continue;
1354
1355 addr = in_dev_select_addr(in_dev, scope);
1356 if (addr)
1357 goto out_unlock;
1358 }
1359out_unlock:
1360 rcu_read_unlock();
1361 return addr;
1362}
1363EXPORT_SYMBOL(inet_select_addr);
1364
1365static __be32 confirm_addr_indev(struct in_device *in_dev, __be32 dst,
1366 __be32 local, int scope)
1367{
1368 unsigned char localnet_scope = RT_SCOPE_HOST;
1369 const struct in_ifaddr *ifa;
1370 __be32 addr = 0;
1371 int same = 0;
1372
1373 if (unlikely(IN_DEV_ROUTE_LOCALNET(in_dev)))
1374 localnet_scope = RT_SCOPE_LINK;
1375
1376 in_dev_for_each_ifa_rcu(ifa, in_dev) {
1377 unsigned char min_scope = min(ifa->ifa_scope, localnet_scope);
1378
1379 if (!addr &&
1380 (local == ifa->ifa_local || !local) &&
1381 min_scope <= scope) {
1382 addr = ifa->ifa_local;
1383 if (same)
1384 break;
1385 }
1386 if (!same) {
1387 same = (!local || inet_ifa_match(local, ifa)) &&
1388 (!dst || inet_ifa_match(dst, ifa));
1389 if (same && addr) {
1390 if (local || !dst)
1391 break;
1392 /* Is the selected addr into dst subnet? */
1393 if (inet_ifa_match(addr, ifa))
1394 break;
1395 /* No, then can we use new local src? */
1396 if (min_scope <= scope) {
1397 addr = ifa->ifa_local;
1398 break;
1399 }
1400 /* search for large dst subnet for addr */
1401 same = 0;
1402 }
1403 }
1404 }
1405
1406 return same ? addr : 0;
1407}
1408
1409/*
1410 * Confirm that local IP address exists using wildcards:
1411 * - net: netns to check, cannot be NULL
1412 * - in_dev: only on this interface, NULL=any interface
1413 * - dst: only in the same subnet as dst, 0=any dst
1414 * - local: address, 0=autoselect the local address
1415 * - scope: maximum allowed scope value for the local address
1416 */
1417__be32 inet_confirm_addr(struct net *net, struct in_device *in_dev,
1418 __be32 dst, __be32 local, int scope)
1419{
1420 __be32 addr = 0;
1421 struct net_device *dev;
1422
1423 if (in_dev)
1424 return confirm_addr_indev(in_dev, dst, local, scope);
1425
1426 rcu_read_lock();
1427 for_each_netdev_rcu(net, dev) {
1428 in_dev = __in_dev_get_rcu(dev);
1429 if (in_dev) {
1430 addr = confirm_addr_indev(in_dev, dst, local, scope);
1431 if (addr)
1432 break;
1433 }
1434 }
1435 rcu_read_unlock();
1436
1437 return addr;
1438}
1439EXPORT_SYMBOL(inet_confirm_addr);
1440
1441/*
1442 * Device notifier
1443 */
1444
1445int register_inetaddr_notifier(struct notifier_block *nb)
1446{
1447 return blocking_notifier_chain_register(&inetaddr_chain, nb);
1448}
1449EXPORT_SYMBOL(register_inetaddr_notifier);
1450
1451int unregister_inetaddr_notifier(struct notifier_block *nb)
1452{
1453 return blocking_notifier_chain_unregister(&inetaddr_chain, nb);
1454}
1455EXPORT_SYMBOL(unregister_inetaddr_notifier);
1456
1457int register_inetaddr_validator_notifier(struct notifier_block *nb)
1458{
1459 return blocking_notifier_chain_register(&inetaddr_validator_chain, nb);
1460}
1461EXPORT_SYMBOL(register_inetaddr_validator_notifier);
1462
1463int unregister_inetaddr_validator_notifier(struct notifier_block *nb)
1464{
1465 return blocking_notifier_chain_unregister(&inetaddr_validator_chain,
1466 nb);
1467}
1468EXPORT_SYMBOL(unregister_inetaddr_validator_notifier);
1469
1470/* Rename ifa_labels for a device name change. Make some effort to preserve
1471 * existing alias numbering and to create unique labels if possible.
1472*/
1473static void inetdev_changename(struct net_device *dev, struct in_device *in_dev)
1474{
1475 struct in_ifaddr *ifa;
1476 int named = 0;
1477
1478 in_dev_for_each_ifa_rtnl(ifa, in_dev) {
1479 char old[IFNAMSIZ], *dot;
1480
1481 memcpy(old, ifa->ifa_label, IFNAMSIZ);
1482 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1483 if (named++ == 0)
1484 goto skip;
1485 dot = strchr(old, ':');
1486 if (!dot) {
1487 sprintf(old, ":%d", named);
1488 dot = old;
1489 }
1490 if (strlen(dot) + strlen(dev->name) < IFNAMSIZ)
1491 strcat(ifa->ifa_label, dot);
1492 else
1493 strcpy(ifa->ifa_label + (IFNAMSIZ - strlen(dot) - 1), dot);
1494skip:
1495 rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0);
1496 }
1497}
1498
1499static bool inetdev_valid_mtu(unsigned int mtu)
1500{
1501 return mtu >= IPV4_MIN_MTU;
1502}
1503
1504static void inetdev_send_gratuitous_arp(struct net_device *dev,
1505 struct in_device *in_dev)
1506
1507{
1508 const struct in_ifaddr *ifa;
1509
1510 in_dev_for_each_ifa_rtnl(ifa, in_dev) {
1511 arp_send(ARPOP_REQUEST, ETH_P_ARP,
1512 ifa->ifa_local, dev,
1513 ifa->ifa_local, NULL,
1514 dev->dev_addr, NULL);
1515 }
1516}
1517
1518/* Called only under RTNL semaphore */
1519
1520static int inetdev_event(struct notifier_block *this, unsigned long event,
1521 void *ptr)
1522{
1523 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1524 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1525
1526 ASSERT_RTNL();
1527
1528 if (!in_dev) {
1529 if (event == NETDEV_REGISTER) {
1530 in_dev = inetdev_init(dev);
1531 if (IS_ERR(in_dev))
1532 return notifier_from_errno(PTR_ERR(in_dev));
1533 if (dev->flags & IFF_LOOPBACK) {
1534 IN_DEV_CONF_SET(in_dev, NOXFRM, 1);
1535 IN_DEV_CONF_SET(in_dev, NOPOLICY, 1);
1536 }
1537 } else if (event == NETDEV_CHANGEMTU) {
1538 /* Re-enabling IP */
1539 if (inetdev_valid_mtu(dev->mtu))
1540 in_dev = inetdev_init(dev);
1541 }
1542 goto out;
1543 }
1544
1545 switch (event) {
1546 case NETDEV_REGISTER:
1547 pr_debug("%s: bug\n", __func__);
1548 RCU_INIT_POINTER(dev->ip_ptr, NULL);
1549 break;
1550 case NETDEV_UP:
1551 if (!inetdev_valid_mtu(dev->mtu))
1552 break;
1553 if (dev->flags & IFF_LOOPBACK) {
1554 struct in_ifaddr *ifa = inet_alloc_ifa();
1555
1556 if (ifa) {
1557 INIT_HLIST_NODE(&ifa->hash);
1558 ifa->ifa_local =
1559 ifa->ifa_address = htonl(INADDR_LOOPBACK);
1560 ifa->ifa_prefixlen = 8;
1561 ifa->ifa_mask = inet_make_mask(8);
1562 in_dev_hold(in_dev);
1563 ifa->ifa_dev = in_dev;
1564 ifa->ifa_scope = RT_SCOPE_HOST;
1565 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1566 set_ifa_lifetime(ifa, INFINITY_LIFE_TIME,
1567 INFINITY_LIFE_TIME);
1568 ipv4_devconf_setall(in_dev);
1569 neigh_parms_data_state_setall(in_dev->arp_parms);
1570 inet_insert_ifa(ifa);
1571 }
1572 }
1573 ip_mc_up(in_dev);
1574 /* fall through */
1575 case NETDEV_CHANGEADDR:
1576 if (!IN_DEV_ARP_NOTIFY(in_dev))
1577 break;
1578 /* fall through */
1579 case NETDEV_NOTIFY_PEERS:
1580 /* Send gratuitous ARP to notify of link change */
1581 inetdev_send_gratuitous_arp(dev, in_dev);
1582 break;
1583 case NETDEV_DOWN:
1584 ip_mc_down(in_dev);
1585 break;
1586 case NETDEV_PRE_TYPE_CHANGE:
1587 ip_mc_unmap(in_dev);
1588 break;
1589 case NETDEV_POST_TYPE_CHANGE:
1590 ip_mc_remap(in_dev);
1591 break;
1592 case NETDEV_CHANGEMTU:
1593 if (inetdev_valid_mtu(dev->mtu))
1594 break;
1595 /* disable IP when MTU is not enough */
1596 /* fall through */
1597 case NETDEV_UNREGISTER:
1598 inetdev_destroy(in_dev);
1599 break;
1600 case NETDEV_CHANGENAME:
1601 /* Do not notify about label change, this event is
1602 * not interesting to applications using netlink.
1603 */
1604 inetdev_changename(dev, in_dev);
1605
1606 devinet_sysctl_unregister(in_dev);
1607 devinet_sysctl_register(in_dev);
1608 break;
1609 }
1610out:
1611 return NOTIFY_DONE;
1612}
1613
1614static struct notifier_block ip_netdev_notifier = {
1615 .notifier_call = inetdev_event,
1616};
1617
1618static size_t inet_nlmsg_size(void)
1619{
1620 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
1621 + nla_total_size(4) /* IFA_ADDRESS */
1622 + nla_total_size(4) /* IFA_LOCAL */
1623 + nla_total_size(4) /* IFA_BROADCAST */
1624 + nla_total_size(IFNAMSIZ) /* IFA_LABEL */
1625 + nla_total_size(4) /* IFA_FLAGS */
1626 + nla_total_size(4) /* IFA_RT_PRIORITY */
1627 + nla_total_size(sizeof(struct ifa_cacheinfo)); /* IFA_CACHEINFO */
1628}
1629
1630static inline u32 cstamp_delta(unsigned long cstamp)
1631{
1632 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
1633}
1634
1635static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
1636 unsigned long tstamp, u32 preferred, u32 valid)
1637{
1638 struct ifa_cacheinfo ci;
1639
1640 ci.cstamp = cstamp_delta(cstamp);
1641 ci.tstamp = cstamp_delta(tstamp);
1642 ci.ifa_prefered = preferred;
1643 ci.ifa_valid = valid;
1644
1645 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
1646}
1647
1648static int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa,
1649 struct inet_fill_args *args)
1650{
1651 struct ifaddrmsg *ifm;
1652 struct nlmsghdr *nlh;
1653 u32 preferred, valid;
1654
1655 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, sizeof(*ifm),
1656 args->flags);
1657 if (!nlh)
1658 return -EMSGSIZE;
1659
1660 ifm = nlmsg_data(nlh);
1661 ifm->ifa_family = AF_INET;
1662 ifm->ifa_prefixlen = ifa->ifa_prefixlen;
1663 ifm->ifa_flags = ifa->ifa_flags;
1664 ifm->ifa_scope = ifa->ifa_scope;
1665 ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
1666
1667 if (args->netnsid >= 0 &&
1668 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid))
1669 goto nla_put_failure;
1670
1671 if (!(ifm->ifa_flags & IFA_F_PERMANENT)) {
1672 preferred = ifa->ifa_preferred_lft;
1673 valid = ifa->ifa_valid_lft;
1674 if (preferred != INFINITY_LIFE_TIME) {
1675 long tval = (jiffies - ifa->ifa_tstamp) / HZ;
1676
1677 if (preferred > tval)
1678 preferred -= tval;
1679 else
1680 preferred = 0;
1681 if (valid != INFINITY_LIFE_TIME) {
1682 if (valid > tval)
1683 valid -= tval;
1684 else
1685 valid = 0;
1686 }
1687 }
1688 } else {
1689 preferred = INFINITY_LIFE_TIME;
1690 valid = INFINITY_LIFE_TIME;
1691 }
1692 if ((ifa->ifa_address &&
1693 nla_put_in_addr(skb, IFA_ADDRESS, ifa->ifa_address)) ||
1694 (ifa->ifa_local &&
1695 nla_put_in_addr(skb, IFA_LOCAL, ifa->ifa_local)) ||
1696 (ifa->ifa_broadcast &&
1697 nla_put_in_addr(skb, IFA_BROADCAST, ifa->ifa_broadcast)) ||
1698 (ifa->ifa_label[0] &&
1699 nla_put_string(skb, IFA_LABEL, ifa->ifa_label)) ||
1700 nla_put_u32(skb, IFA_FLAGS, ifa->ifa_flags) ||
1701 (ifa->ifa_rt_priority &&
1702 nla_put_u32(skb, IFA_RT_PRIORITY, ifa->ifa_rt_priority)) ||
1703 put_cacheinfo(skb, ifa->ifa_cstamp, ifa->ifa_tstamp,
1704 preferred, valid))
1705 goto nla_put_failure;
1706
1707 nlmsg_end(skb, nlh);
1708 return 0;
1709
1710nla_put_failure:
1711 nlmsg_cancel(skb, nlh);
1712 return -EMSGSIZE;
1713}
1714
1715static int inet_valid_dump_ifaddr_req(const struct nlmsghdr *nlh,
1716 struct inet_fill_args *fillargs,
1717 struct net **tgt_net, struct sock *sk,
1718 struct netlink_callback *cb)
1719{
1720 struct netlink_ext_ack *extack = cb->extack;
1721 struct nlattr *tb[IFA_MAX+1];
1722 struct ifaddrmsg *ifm;
1723 int err, i;
1724
1725 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
1726 NL_SET_ERR_MSG(extack, "ipv4: Invalid header for address dump request");
1727 return -EINVAL;
1728 }
1729
1730 ifm = nlmsg_data(nlh);
1731 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
1732 NL_SET_ERR_MSG(extack, "ipv4: Invalid values in header for address dump request");
1733 return -EINVAL;
1734 }
1735
1736 fillargs->ifindex = ifm->ifa_index;
1737 if (fillargs->ifindex) {
1738 cb->answer_flags |= NLM_F_DUMP_FILTERED;
1739 fillargs->flags |= NLM_F_DUMP_FILTERED;
1740 }
1741
1742 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
1743 ifa_ipv4_policy, extack);
1744 if (err < 0)
1745 return err;
1746
1747 for (i = 0; i <= IFA_MAX; ++i) {
1748 if (!tb[i])
1749 continue;
1750
1751 if (i == IFA_TARGET_NETNSID) {
1752 struct net *net;
1753
1754 fillargs->netnsid = nla_get_s32(tb[i]);
1755
1756 net = rtnl_get_net_ns_capable(sk, fillargs->netnsid);
1757 if (IS_ERR(net)) {
1758 fillargs->netnsid = -1;
1759 NL_SET_ERR_MSG(extack, "ipv4: Invalid target network namespace id");
1760 return PTR_ERR(net);
1761 }
1762 *tgt_net = net;
1763 } else {
1764 NL_SET_ERR_MSG(extack, "ipv4: Unsupported attribute in dump request");
1765 return -EINVAL;
1766 }
1767 }
1768
1769 return 0;
1770}
1771
1772static int in_dev_dump_addr(struct in_device *in_dev, struct sk_buff *skb,
1773 struct netlink_callback *cb, int s_ip_idx,
1774 struct inet_fill_args *fillargs)
1775{
1776 struct in_ifaddr *ifa;
1777 int ip_idx = 0;
1778 int err;
1779
1780 in_dev_for_each_ifa_rtnl(ifa, in_dev) {
1781 if (ip_idx < s_ip_idx) {
1782 ip_idx++;
1783 continue;
1784 }
1785 err = inet_fill_ifaddr(skb, ifa, fillargs);
1786 if (err < 0)
1787 goto done;
1788
1789 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1790 ip_idx++;
1791 }
1792 err = 0;
1793
1794done:
1795 cb->args[2] = ip_idx;
1796
1797 return err;
1798}
1799
1800static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
1801{
1802 const struct nlmsghdr *nlh = cb->nlh;
1803 struct inet_fill_args fillargs = {
1804 .portid = NETLINK_CB(cb->skb).portid,
1805 .seq = nlh->nlmsg_seq,
1806 .event = RTM_NEWADDR,
1807 .flags = NLM_F_MULTI,
1808 .netnsid = -1,
1809 };
1810 struct net *net = sock_net(skb->sk);
1811 struct net *tgt_net = net;
1812 int h, s_h;
1813 int idx, s_idx;
1814 int s_ip_idx;
1815 struct net_device *dev;
1816 struct in_device *in_dev;
1817 struct hlist_head *head;
1818 int err = 0;
1819
1820 s_h = cb->args[0];
1821 s_idx = idx = cb->args[1];
1822 s_ip_idx = cb->args[2];
1823
1824 if (cb->strict_check) {
1825 err = inet_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net,
1826 skb->sk, cb);
1827 if (err < 0)
1828 goto put_tgt_net;
1829
1830 err = 0;
1831 if (fillargs.ifindex) {
1832 dev = __dev_get_by_index(tgt_net, fillargs.ifindex);
1833 if (!dev) {
1834 err = -ENODEV;
1835 goto put_tgt_net;
1836 }
1837
1838 in_dev = __in_dev_get_rtnl(dev);
1839 if (in_dev) {
1840 err = in_dev_dump_addr(in_dev, skb, cb, s_ip_idx,
1841 &fillargs);
1842 }
1843 goto put_tgt_net;
1844 }
1845 }
1846
1847 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1848 idx = 0;
1849 head = &tgt_net->dev_index_head[h];
1850 rcu_read_lock();
1851 cb->seq = atomic_read(&tgt_net->ipv4.dev_addr_genid) ^
1852 tgt_net->dev_base_seq;
1853 hlist_for_each_entry_rcu(dev, head, index_hlist) {
1854 if (idx < s_idx)
1855 goto cont;
1856 if (h > s_h || idx > s_idx)
1857 s_ip_idx = 0;
1858 in_dev = __in_dev_get_rcu(dev);
1859 if (!in_dev)
1860 goto cont;
1861
1862 err = in_dev_dump_addr(in_dev, skb, cb, s_ip_idx,
1863 &fillargs);
1864 if (err < 0) {
1865 rcu_read_unlock();
1866 goto done;
1867 }
1868cont:
1869 idx++;
1870 }
1871 rcu_read_unlock();
1872 }
1873
1874done:
1875 cb->args[0] = h;
1876 cb->args[1] = idx;
1877put_tgt_net:
1878 if (fillargs.netnsid >= 0)
1879 put_net(tgt_net);
1880
1881 return skb->len ? : err;
1882}
1883
1884static void rtmsg_ifa(int event, struct in_ifaddr *ifa, struct nlmsghdr *nlh,
1885 u32 portid)
1886{
1887 struct inet_fill_args fillargs = {
1888 .portid = portid,
1889 .seq = nlh ? nlh->nlmsg_seq : 0,
1890 .event = event,
1891 .flags = 0,
1892 .netnsid = -1,
1893 };
1894 struct sk_buff *skb;
1895 int err = -ENOBUFS;
1896 struct net *net;
1897
1898 net = dev_net(ifa->ifa_dev->dev);
1899 skb = nlmsg_new(inet_nlmsg_size(), GFP_KERNEL);
1900 if (!skb)
1901 goto errout;
1902
1903 err = inet_fill_ifaddr(skb, ifa, &fillargs);
1904 if (err < 0) {
1905 /* -EMSGSIZE implies BUG in inet_nlmsg_size() */
1906 WARN_ON(err == -EMSGSIZE);
1907 kfree_skb(skb);
1908 goto errout;
1909 }
1910 rtnl_notify(skb, net, portid, RTNLGRP_IPV4_IFADDR, nlh, GFP_KERNEL);
1911 return;
1912errout:
1913 if (err < 0)
1914 rtnl_set_sk_err(net, RTNLGRP_IPV4_IFADDR, err);
1915}
1916
1917static size_t inet_get_link_af_size(const struct net_device *dev,
1918 u32 ext_filter_mask)
1919{
1920 struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr);
1921
1922 if (!in_dev)
1923 return 0;
1924
1925 return nla_total_size(IPV4_DEVCONF_MAX * 4); /* IFLA_INET_CONF */
1926}
1927
1928static int inet_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
1929 u32 ext_filter_mask)
1930{
1931 struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr);
1932 struct nlattr *nla;
1933 int i;
1934
1935 if (!in_dev)
1936 return -ENODATA;
1937
1938 nla = nla_reserve(skb, IFLA_INET_CONF, IPV4_DEVCONF_MAX * 4);
1939 if (!nla)
1940 return -EMSGSIZE;
1941
1942 for (i = 0; i < IPV4_DEVCONF_MAX; i++)
1943 ((u32 *) nla_data(nla))[i] = in_dev->cnf.data[i];
1944
1945 return 0;
1946}
1947
1948static const struct nla_policy inet_af_policy[IFLA_INET_MAX+1] = {
1949 [IFLA_INET_CONF] = { .type = NLA_NESTED },
1950};
1951
1952static int inet_validate_link_af(const struct net_device *dev,
1953 const struct nlattr *nla)
1954{
1955 struct nlattr *a, *tb[IFLA_INET_MAX+1];
1956 int err, rem;
1957
1958 if (dev && !__in_dev_get_rcu(dev))
1959 return -EAFNOSUPPORT;
1960
1961 err = nla_parse_nested_deprecated(tb, IFLA_INET_MAX, nla,
1962 inet_af_policy, NULL);
1963 if (err < 0)
1964 return err;
1965
1966 if (tb[IFLA_INET_CONF]) {
1967 nla_for_each_nested(a, tb[IFLA_INET_CONF], rem) {
1968 int cfgid = nla_type(a);
1969
1970 if (nla_len(a) < 4)
1971 return -EINVAL;
1972
1973 if (cfgid <= 0 || cfgid > IPV4_DEVCONF_MAX)
1974 return -EINVAL;
1975 }
1976 }
1977
1978 return 0;
1979}
1980
1981static int inet_set_link_af(struct net_device *dev, const struct nlattr *nla)
1982{
1983 struct in_device *in_dev = __in_dev_get_rcu(dev);
1984 struct nlattr *a, *tb[IFLA_INET_MAX+1];
1985 int rem;
1986
1987 if (!in_dev)
1988 return -EAFNOSUPPORT;
1989
1990 if (nla_parse_nested_deprecated(tb, IFLA_INET_MAX, nla, NULL, NULL) < 0)
1991 BUG();
1992
1993 if (tb[IFLA_INET_CONF]) {
1994 nla_for_each_nested(a, tb[IFLA_INET_CONF], rem)
1995 ipv4_devconf_set(in_dev, nla_type(a), nla_get_u32(a));
1996 }
1997
1998 return 0;
1999}
2000
2001static int inet_netconf_msgsize_devconf(int type)
2002{
2003 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
2004 + nla_total_size(4); /* NETCONFA_IFINDEX */
2005 bool all = false;
2006
2007 if (type == NETCONFA_ALL)
2008 all = true;
2009
2010 if (all || type == NETCONFA_FORWARDING)
2011 size += nla_total_size(4);
2012 if (all || type == NETCONFA_RP_FILTER)
2013 size += nla_total_size(4);
2014 if (all || type == NETCONFA_MC_FORWARDING)
2015 size += nla_total_size(4);
2016 if (all || type == NETCONFA_BC_FORWARDING)
2017 size += nla_total_size(4);
2018 if (all || type == NETCONFA_PROXY_NEIGH)
2019 size += nla_total_size(4);
2020 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
2021 size += nla_total_size(4);
2022
2023 return size;
2024}
2025
2026static int inet_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
2027 struct ipv4_devconf *devconf, u32 portid,
2028 u32 seq, int event, unsigned int flags,
2029 int type)
2030{
2031 struct nlmsghdr *nlh;
2032 struct netconfmsg *ncm;
2033 bool all = false;
2034
2035 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
2036 flags);
2037 if (!nlh)
2038 return -EMSGSIZE;
2039
2040 if (type == NETCONFA_ALL)
2041 all = true;
2042
2043 ncm = nlmsg_data(nlh);
2044 ncm->ncm_family = AF_INET;
2045
2046 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
2047 goto nla_put_failure;
2048
2049 if (!devconf)
2050 goto out;
2051
2052 if ((all || type == NETCONFA_FORWARDING) &&
2053 nla_put_s32(skb, NETCONFA_FORWARDING,
2054 IPV4_DEVCONF(*devconf, FORWARDING)) < 0)
2055 goto nla_put_failure;
2056 if ((all || type == NETCONFA_RP_FILTER) &&
2057 nla_put_s32(skb, NETCONFA_RP_FILTER,
2058 IPV4_DEVCONF(*devconf, RP_FILTER)) < 0)
2059 goto nla_put_failure;
2060 if ((all || type == NETCONFA_MC_FORWARDING) &&
2061 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
2062 IPV4_DEVCONF(*devconf, MC_FORWARDING)) < 0)
2063 goto nla_put_failure;
2064 if ((all || type == NETCONFA_BC_FORWARDING) &&
2065 nla_put_s32(skb, NETCONFA_BC_FORWARDING,
2066 IPV4_DEVCONF(*devconf, BC_FORWARDING)) < 0)
2067 goto nla_put_failure;
2068 if ((all || type == NETCONFA_PROXY_NEIGH) &&
2069 nla_put_s32(skb, NETCONFA_PROXY_NEIGH,
2070 IPV4_DEVCONF(*devconf, PROXY_ARP)) < 0)
2071 goto nla_put_failure;
2072 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
2073 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
2074 IPV4_DEVCONF(*devconf, IGNORE_ROUTES_WITH_LINKDOWN)) < 0)
2075 goto nla_put_failure;
2076
2077out:
2078 nlmsg_end(skb, nlh);
2079 return 0;
2080
2081nla_put_failure:
2082 nlmsg_cancel(skb, nlh);
2083 return -EMSGSIZE;
2084}
2085
2086void inet_netconf_notify_devconf(struct net *net, int event, int type,
2087 int ifindex, struct ipv4_devconf *devconf)
2088{
2089 struct sk_buff *skb;
2090 int err = -ENOBUFS;
2091
2092 skb = nlmsg_new(inet_netconf_msgsize_devconf(type), GFP_KERNEL);
2093 if (!skb)
2094 goto errout;
2095
2096 err = inet_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
2097 event, 0, type);
2098 if (err < 0) {
2099 /* -EMSGSIZE implies BUG in inet_netconf_msgsize_devconf() */
2100 WARN_ON(err == -EMSGSIZE);
2101 kfree_skb(skb);
2102 goto errout;
2103 }
2104 rtnl_notify(skb, net, 0, RTNLGRP_IPV4_NETCONF, NULL, GFP_KERNEL);
2105 return;
2106errout:
2107 if (err < 0)
2108 rtnl_set_sk_err(net, RTNLGRP_IPV4_NETCONF, err);
2109}
2110
2111static const struct nla_policy devconf_ipv4_policy[NETCONFA_MAX+1] = {
2112 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
2113 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
2114 [NETCONFA_RP_FILTER] = { .len = sizeof(int) },
2115 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
2116 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
2117};
2118
2119static int inet_netconf_valid_get_req(struct sk_buff *skb,
2120 const struct nlmsghdr *nlh,
2121 struct nlattr **tb,
2122 struct netlink_ext_ack *extack)
2123{
2124 int i, err;
2125
2126 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) {
2127 NL_SET_ERR_MSG(extack, "ipv4: Invalid header for netconf get request");
2128 return -EINVAL;
2129 }
2130
2131 if (!netlink_strict_get_check(skb))
2132 return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg),
2133 tb, NETCONFA_MAX,
2134 devconf_ipv4_policy, extack);
2135
2136 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg),
2137 tb, NETCONFA_MAX,
2138 devconf_ipv4_policy, extack);
2139 if (err)
2140 return err;
2141
2142 for (i = 0; i <= NETCONFA_MAX; i++) {
2143 if (!tb[i])
2144 continue;
2145
2146 switch (i) {
2147 case NETCONFA_IFINDEX:
2148 break;
2149 default:
2150 NL_SET_ERR_MSG(extack, "ipv4: Unsupported attribute in netconf get request");
2151 return -EINVAL;
2152 }
2153 }
2154
2155 return 0;
2156}
2157
2158static int inet_netconf_get_devconf(struct sk_buff *in_skb,
2159 struct nlmsghdr *nlh,
2160 struct netlink_ext_ack *extack)
2161{
2162 struct net *net = sock_net(in_skb->sk);
2163 struct nlattr *tb[NETCONFA_MAX+1];
2164 struct sk_buff *skb;
2165 struct ipv4_devconf *devconf;
2166 struct in_device *in_dev;
2167 struct net_device *dev;
2168 int ifindex;
2169 int err;
2170
2171 err = inet_netconf_valid_get_req(in_skb, nlh, tb, extack);
2172 if (err)
2173 goto errout;
2174
2175 err = -EINVAL;
2176 if (!tb[NETCONFA_IFINDEX])
2177 goto errout;
2178
2179 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
2180 switch (ifindex) {
2181 case NETCONFA_IFINDEX_ALL:
2182 devconf = net->ipv4.devconf_all;
2183 break;
2184 case NETCONFA_IFINDEX_DEFAULT:
2185 devconf = net->ipv4.devconf_dflt;
2186 break;
2187 default:
2188 dev = __dev_get_by_index(net, ifindex);
2189 if (!dev)
2190 goto errout;
2191 in_dev = __in_dev_get_rtnl(dev);
2192 if (!in_dev)
2193 goto errout;
2194 devconf = &in_dev->cnf;
2195 break;
2196 }
2197
2198 err = -ENOBUFS;
2199 skb = nlmsg_new(inet_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL);
2200 if (!skb)
2201 goto errout;
2202
2203 err = inet_netconf_fill_devconf(skb, ifindex, devconf,
2204 NETLINK_CB(in_skb).portid,
2205 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
2206 NETCONFA_ALL);
2207 if (err < 0) {
2208 /* -EMSGSIZE implies BUG in inet_netconf_msgsize_devconf() */
2209 WARN_ON(err == -EMSGSIZE);
2210 kfree_skb(skb);
2211 goto errout;
2212 }
2213 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
2214errout:
2215 return err;
2216}
2217
2218static int inet_netconf_dump_devconf(struct sk_buff *skb,
2219 struct netlink_callback *cb)
2220{
2221 const struct nlmsghdr *nlh = cb->nlh;
2222 struct net *net = sock_net(skb->sk);
2223 int h, s_h;
2224 int idx, s_idx;
2225 struct net_device *dev;
2226 struct in_device *in_dev;
2227 struct hlist_head *head;
2228
2229 if (cb->strict_check) {
2230 struct netlink_ext_ack *extack = cb->extack;
2231 struct netconfmsg *ncm;
2232
2233 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) {
2234 NL_SET_ERR_MSG(extack, "ipv4: Invalid header for netconf dump request");
2235 return -EINVAL;
2236 }
2237
2238 if (nlmsg_attrlen(nlh, sizeof(*ncm))) {
2239 NL_SET_ERR_MSG(extack, "ipv4: Invalid data after header in netconf dump request");
2240 return -EINVAL;
2241 }
2242 }
2243
2244 s_h = cb->args[0];
2245 s_idx = idx = cb->args[1];
2246
2247 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
2248 idx = 0;
2249 head = &net->dev_index_head[h];
2250 rcu_read_lock();
2251 cb->seq = atomic_read(&net->ipv4.dev_addr_genid) ^
2252 net->dev_base_seq;
2253 hlist_for_each_entry_rcu(dev, head, index_hlist) {
2254 if (idx < s_idx)
2255 goto cont;
2256 in_dev = __in_dev_get_rcu(dev);
2257 if (!in_dev)
2258 goto cont;
2259
2260 if (inet_netconf_fill_devconf(skb, dev->ifindex,
2261 &in_dev->cnf,
2262 NETLINK_CB(cb->skb).portid,
2263 nlh->nlmsg_seq,
2264 RTM_NEWNETCONF,
2265 NLM_F_MULTI,
2266 NETCONFA_ALL) < 0) {
2267 rcu_read_unlock();
2268 goto done;
2269 }
2270 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2271cont:
2272 idx++;
2273 }
2274 rcu_read_unlock();
2275 }
2276 if (h == NETDEV_HASHENTRIES) {
2277 if (inet_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
2278 net->ipv4.devconf_all,
2279 NETLINK_CB(cb->skb).portid,
2280 nlh->nlmsg_seq,
2281 RTM_NEWNETCONF, NLM_F_MULTI,
2282 NETCONFA_ALL) < 0)
2283 goto done;
2284 else
2285 h++;
2286 }
2287 if (h == NETDEV_HASHENTRIES + 1) {
2288 if (inet_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
2289 net->ipv4.devconf_dflt,
2290 NETLINK_CB(cb->skb).portid,
2291 nlh->nlmsg_seq,
2292 RTM_NEWNETCONF, NLM_F_MULTI,
2293 NETCONFA_ALL) < 0)
2294 goto done;
2295 else
2296 h++;
2297 }
2298done:
2299 cb->args[0] = h;
2300 cb->args[1] = idx;
2301
2302 return skb->len;
2303}
2304
2305#ifdef CONFIG_SYSCTL
2306
2307static void devinet_copy_dflt_conf(struct net *net, int i)
2308{
2309 struct net_device *dev;
2310
2311 rcu_read_lock();
2312 for_each_netdev_rcu(net, dev) {
2313 struct in_device *in_dev;
2314
2315 in_dev = __in_dev_get_rcu(dev);
2316 if (in_dev && !test_bit(i, in_dev->cnf.state))
2317 in_dev->cnf.data[i] = net->ipv4.devconf_dflt->data[i];
2318 }
2319 rcu_read_unlock();
2320}
2321
2322/* called with RTNL locked */
2323static void inet_forward_change(struct net *net)
2324{
2325 struct net_device *dev;
2326 int on = IPV4_DEVCONF_ALL(net, FORWARDING);
2327
2328 IPV4_DEVCONF_ALL(net, ACCEPT_REDIRECTS) = !on;
2329 IPV4_DEVCONF_DFLT(net, FORWARDING) = on;
2330 inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
2331 NETCONFA_FORWARDING,
2332 NETCONFA_IFINDEX_ALL,
2333 net->ipv4.devconf_all);
2334 inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
2335 NETCONFA_FORWARDING,
2336 NETCONFA_IFINDEX_DEFAULT,
2337 net->ipv4.devconf_dflt);
2338
2339 for_each_netdev(net, dev) {
2340 struct in_device *in_dev;
2341
2342 if (on)
2343 dev_disable_lro(dev);
2344
2345 in_dev = __in_dev_get_rtnl(dev);
2346 if (in_dev) {
2347 IN_DEV_CONF_SET(in_dev, FORWARDING, on);
2348 inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
2349 NETCONFA_FORWARDING,
2350 dev->ifindex, &in_dev->cnf);
2351 }
2352 }
2353}
2354
2355static int devinet_conf_ifindex(struct net *net, struct ipv4_devconf *cnf)
2356{
2357 if (cnf == net->ipv4.devconf_dflt)
2358 return NETCONFA_IFINDEX_DEFAULT;
2359 else if (cnf == net->ipv4.devconf_all)
2360 return NETCONFA_IFINDEX_ALL;
2361 else {
2362 struct in_device *idev
2363 = container_of(cnf, struct in_device, cnf);
2364 return idev->dev->ifindex;
2365 }
2366}
2367
2368static int devinet_conf_proc(struct ctl_table *ctl, int write,
2369 void __user *buffer,
2370 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 __user *buffer,
2423 size_t *lenp, loff_t *ppos)
2424{
2425 int *valp = ctl->data;
2426 int val = *valp;
2427 loff_t pos = *ppos;
2428 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
2429
2430 if (write && *valp != val) {
2431 struct net *net = ctl->extra2;
2432
2433 if (valp != &IPV4_DEVCONF_DFLT(net, FORWARDING)) {
2434 if (!rtnl_trylock()) {
2435 /* Restore the original values before restarting */
2436 *valp = val;
2437 *ppos = pos;
2438 return restart_syscall();
2439 }
2440 if (valp == &IPV4_DEVCONF_ALL(net, FORWARDING)) {
2441 inet_forward_change(net);
2442 } else {
2443 struct ipv4_devconf *cnf = ctl->extra1;
2444 struct in_device *idev =
2445 container_of(cnf, struct in_device, cnf);
2446 if (*valp)
2447 dev_disable_lro(idev->dev);
2448 inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
2449 NETCONFA_FORWARDING,
2450 idev->dev->ifindex,
2451 cnf);
2452 }
2453 rtnl_unlock();
2454 rt_cache_flush(net);
2455 } else
2456 inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
2457 NETCONFA_FORWARDING,
2458 NETCONFA_IFINDEX_DEFAULT,
2459 net->ipv4.devconf_dflt);
2460 }
2461
2462 return ret;
2463}
2464
2465static int ipv4_doint_and_flush(struct ctl_table *ctl, int write,
2466 void __user *buffer,
2467 size_t *lenp, loff_t *ppos)
2468{
2469 int *valp = ctl->data;
2470 int val = *valp;
2471 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
2472 struct net *net = ctl->extra2;
2473
2474 if (write && *valp != val)
2475 rt_cache_flush(net);
2476
2477 return ret;
2478}
2479
2480#define DEVINET_SYSCTL_ENTRY(attr, name, mval, proc) \
2481 { \
2482 .procname = name, \
2483 .data = ipv4_devconf.data + \
2484 IPV4_DEVCONF_ ## attr - 1, \
2485 .maxlen = sizeof(int), \
2486 .mode = mval, \
2487 .proc_handler = proc, \
2488 .extra1 = &ipv4_devconf, \
2489 }
2490
2491#define DEVINET_SYSCTL_RW_ENTRY(attr, name) \
2492 DEVINET_SYSCTL_ENTRY(attr, name, 0644, devinet_conf_proc)
2493
2494#define DEVINET_SYSCTL_RO_ENTRY(attr, name) \
2495 DEVINET_SYSCTL_ENTRY(attr, name, 0444, devinet_conf_proc)
2496
2497#define DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, proc) \
2498 DEVINET_SYSCTL_ENTRY(attr, name, 0644, proc)
2499
2500#define DEVINET_SYSCTL_FLUSHING_ENTRY(attr, name) \
2501 DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, ipv4_doint_and_flush)
2502
2503static struct devinet_sysctl_table {
2504 struct ctl_table_header *sysctl_header;
2505 struct ctl_table devinet_vars[__IPV4_DEVCONF_MAX];
2506} devinet_sysctl = {
2507 .devinet_vars = {
2508 DEVINET_SYSCTL_COMPLEX_ENTRY(FORWARDING, "forwarding",
2509 devinet_sysctl_forward),
2510 DEVINET_SYSCTL_RO_ENTRY(MC_FORWARDING, "mc_forwarding"),
2511 DEVINET_SYSCTL_RW_ENTRY(BC_FORWARDING, "bc_forwarding"),
2512
2513 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_REDIRECTS, "accept_redirects"),
2514 DEVINET_SYSCTL_RW_ENTRY(SECURE_REDIRECTS, "secure_redirects"),
2515 DEVINET_SYSCTL_RW_ENTRY(SHARED_MEDIA, "shared_media"),
2516 DEVINET_SYSCTL_RW_ENTRY(RP_FILTER, "rp_filter"),
2517 DEVINET_SYSCTL_RW_ENTRY(SEND_REDIRECTS, "send_redirects"),
2518 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_SOURCE_ROUTE,
2519 "accept_source_route"),
2520 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_LOCAL, "accept_local"),
2521 DEVINET_SYSCTL_RW_ENTRY(SRC_VMARK, "src_valid_mark"),
2522 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP, "proxy_arp"),
2523 DEVINET_SYSCTL_RW_ENTRY(MEDIUM_ID, "medium_id"),
2524 DEVINET_SYSCTL_RW_ENTRY(BOOTP_RELAY, "bootp_relay"),
2525 DEVINET_SYSCTL_RW_ENTRY(LOG_MARTIANS, "log_martians"),
2526 DEVINET_SYSCTL_RW_ENTRY(TAG, "tag"),
2527 DEVINET_SYSCTL_RW_ENTRY(ARPFILTER, "arp_filter"),
2528 DEVINET_SYSCTL_RW_ENTRY(ARP_ANNOUNCE, "arp_announce"),
2529 DEVINET_SYSCTL_RW_ENTRY(ARP_IGNORE, "arp_ignore"),
2530 DEVINET_SYSCTL_RW_ENTRY(ARP_ACCEPT, "arp_accept"),
2531 DEVINET_SYSCTL_RW_ENTRY(ARP_NOTIFY, "arp_notify"),
2532 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP_PVLAN, "proxy_arp_pvlan"),
2533 DEVINET_SYSCTL_RW_ENTRY(FORCE_IGMP_VERSION,
2534 "force_igmp_version"),
2535 DEVINET_SYSCTL_RW_ENTRY(IGMPV2_UNSOLICITED_REPORT_INTERVAL,
2536 "igmpv2_unsolicited_report_interval"),
2537 DEVINET_SYSCTL_RW_ENTRY(IGMPV3_UNSOLICITED_REPORT_INTERVAL,
2538 "igmpv3_unsolicited_report_interval"),
2539 DEVINET_SYSCTL_RW_ENTRY(IGNORE_ROUTES_WITH_LINKDOWN,
2540 "ignore_routes_with_linkdown"),
2541 DEVINET_SYSCTL_RW_ENTRY(DROP_GRATUITOUS_ARP,
2542 "drop_gratuitous_arp"),
2543
2544 DEVINET_SYSCTL_FLUSHING_ENTRY(NOXFRM, "disable_xfrm"),
2545 DEVINET_SYSCTL_FLUSHING_ENTRY(NOPOLICY, "disable_policy"),
2546 DEVINET_SYSCTL_FLUSHING_ENTRY(PROMOTE_SECONDARIES,
2547 "promote_secondaries"),
2548 DEVINET_SYSCTL_FLUSHING_ENTRY(ROUTE_LOCALNET,
2549 "route_localnet"),
2550 DEVINET_SYSCTL_FLUSHING_ENTRY(DROP_UNICAST_IN_L2_MULTICAST,
2551 "drop_unicast_in_l2_multicast"),
2552 },
2553};
2554
2555static int __devinet_sysctl_register(struct net *net, char *dev_name,
2556 int ifindex, struct ipv4_devconf *p)
2557{
2558 int i;
2559 struct devinet_sysctl_table *t;
2560 char path[sizeof("net/ipv4/conf/") + IFNAMSIZ];
2561
2562 t = kmemdup(&devinet_sysctl, sizeof(*t), GFP_KERNEL);
2563 if (!t)
2564 goto out;
2565
2566 for (i = 0; i < ARRAY_SIZE(t->devinet_vars) - 1; i++) {
2567 t->devinet_vars[i].data += (char *)p - (char *)&ipv4_devconf;
2568 t->devinet_vars[i].extra1 = p;
2569 t->devinet_vars[i].extra2 = net;
2570 }
2571
2572 snprintf(path, sizeof(path), "net/ipv4/conf/%s", dev_name);
2573
2574 t->sysctl_header = register_net_sysctl(net, path, t->devinet_vars);
2575 if (!t->sysctl_header)
2576 goto free;
2577
2578 p->sysctl = t;
2579
2580 inet_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
2581 ifindex, p);
2582 return 0;
2583
2584free:
2585 kfree(t);
2586out:
2587 return -ENOBUFS;
2588}
2589
2590static void __devinet_sysctl_unregister(struct net *net,
2591 struct ipv4_devconf *cnf, int ifindex)
2592{
2593 struct devinet_sysctl_table *t = cnf->sysctl;
2594
2595 if (t) {
2596 cnf->sysctl = NULL;
2597 unregister_net_sysctl_table(t->sysctl_header);
2598 kfree(t);
2599 }
2600
2601 inet_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
2602}
2603
2604static int devinet_sysctl_register(struct in_device *idev)
2605{
2606 int err;
2607
2608 if (!sysctl_dev_name_is_allowed(idev->dev->name))
2609 return -EINVAL;
2610
2611 err = neigh_sysctl_register(idev->dev, idev->arp_parms, NULL);
2612 if (err)
2613 return err;
2614 err = __devinet_sysctl_register(dev_net(idev->dev), idev->dev->name,
2615 idev->dev->ifindex, &idev->cnf);
2616 if (err)
2617 neigh_sysctl_unregister(idev->arp_parms);
2618 return err;
2619}
2620
2621static void devinet_sysctl_unregister(struct in_device *idev)
2622{
2623 struct net *net = dev_net(idev->dev);
2624
2625 __devinet_sysctl_unregister(net, &idev->cnf, idev->dev->ifindex);
2626 neigh_sysctl_unregister(idev->arp_parms);
2627}
2628
2629static struct ctl_table ctl_forward_entry[] = {
2630 {
2631 .procname = "ip_forward",
2632 .data = &ipv4_devconf.data[
2633 IPV4_DEVCONF_FORWARDING - 1],
2634 .maxlen = sizeof(int),
2635 .mode = 0644,
2636 .proc_handler = devinet_sysctl_forward,
2637 .extra1 = &ipv4_devconf,
2638 .extra2 = &init_net,
2639 },
2640 { },
2641};
2642#endif
2643
2644static __net_init int devinet_init_net(struct net *net)
2645{
2646 int err;
2647 struct ipv4_devconf *all, *dflt;
2648#ifdef CONFIG_SYSCTL
2649 struct ctl_table *tbl;
2650 struct ctl_table_header *forw_hdr;
2651#endif
2652
2653 err = -ENOMEM;
2654 all = kmemdup(&ipv4_devconf, sizeof(ipv4_devconf), GFP_KERNEL);
2655 if (!all)
2656 goto err_alloc_all;
2657
2658 dflt = kmemdup(&ipv4_devconf_dflt, sizeof(ipv4_devconf_dflt), GFP_KERNEL);
2659 if (!dflt)
2660 goto err_alloc_dflt;
2661
2662#ifdef CONFIG_SYSCTL
2663 tbl = kmemdup(ctl_forward_entry, sizeof(ctl_forward_entry), GFP_KERNEL);
2664 if (!tbl)
2665 goto err_alloc_ctl;
2666
2667 tbl[0].data = &all->data[IPV4_DEVCONF_FORWARDING - 1];
2668 tbl[0].extra1 = all;
2669 tbl[0].extra2 = net;
2670#endif
2671
2672 if ((!IS_ENABLED(CONFIG_SYSCTL) ||
2673 sysctl_devconf_inherit_init_net != 2) &&
2674 !net_eq(net, &init_net)) {
2675 memcpy(all, init_net.ipv4.devconf_all, sizeof(ipv4_devconf));
2676 memcpy(dflt, init_net.ipv4.devconf_dflt, sizeof(ipv4_devconf_dflt));
2677 }
2678
2679#ifdef CONFIG_SYSCTL
2680 err = __devinet_sysctl_register(net, "all", NETCONFA_IFINDEX_ALL, all);
2681 if (err < 0)
2682 goto err_reg_all;
2683
2684 err = __devinet_sysctl_register(net, "default",
2685 NETCONFA_IFINDEX_DEFAULT, dflt);
2686 if (err < 0)
2687 goto err_reg_dflt;
2688
2689 err = -ENOMEM;
2690 forw_hdr = register_net_sysctl(net, "net/ipv4", tbl);
2691 if (!forw_hdr)
2692 goto err_reg_ctl;
2693 net->ipv4.forw_hdr = forw_hdr;
2694#endif
2695
2696 net->ipv4.devconf_all = all;
2697 net->ipv4.devconf_dflt = dflt;
2698 return 0;
2699
2700#ifdef CONFIG_SYSCTL
2701err_reg_ctl:
2702 __devinet_sysctl_unregister(net, dflt, NETCONFA_IFINDEX_DEFAULT);
2703err_reg_dflt:
2704 __devinet_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL);
2705err_reg_all:
2706 kfree(tbl);
2707err_alloc_ctl:
2708#endif
2709 kfree(dflt);
2710err_alloc_dflt:
2711 kfree(all);
2712err_alloc_all:
2713 return err;
2714}
2715
2716static __net_exit void devinet_exit_net(struct net *net)
2717{
2718#ifdef CONFIG_SYSCTL
2719 struct ctl_table *tbl;
2720
2721 tbl = net->ipv4.forw_hdr->ctl_table_arg;
2722 unregister_net_sysctl_table(net->ipv4.forw_hdr);
2723 __devinet_sysctl_unregister(net, net->ipv4.devconf_dflt,
2724 NETCONFA_IFINDEX_DEFAULT);
2725 __devinet_sysctl_unregister(net, net->ipv4.devconf_all,
2726 NETCONFA_IFINDEX_ALL);
2727 kfree(tbl);
2728#endif
2729 kfree(net->ipv4.devconf_dflt);
2730 kfree(net->ipv4.devconf_all);
2731}
2732
2733static __net_initdata struct pernet_operations devinet_ops = {
2734 .init = devinet_init_net,
2735 .exit = devinet_exit_net,
2736};
2737
2738static struct rtnl_af_ops inet_af_ops __read_mostly = {
2739 .family = AF_INET,
2740 .fill_link_af = inet_fill_link_af,
2741 .get_link_af_size = inet_get_link_af_size,
2742 .validate_link_af = inet_validate_link_af,
2743 .set_link_af = inet_set_link_af,
2744};
2745
2746void __init devinet_init(void)
2747{
2748 int i;
2749
2750 for (i = 0; i < IN4_ADDR_HSIZE; i++)
2751 INIT_HLIST_HEAD(&inet_addr_lst[i]);
2752
2753 register_pernet_subsys(&devinet_ops);
2754
2755 register_gifconf(PF_INET, inet_gifconf);
2756 register_netdevice_notifier(&ip_netdev_notifier);
2757
2758 queue_delayed_work(system_power_efficient_wq, &check_lifetime_work, 0);
2759
2760 rtnl_af_register(&inet_af_ops);
2761
2762 rtnl_register(PF_INET, RTM_NEWADDR, inet_rtm_newaddr, NULL, 0);
2763 rtnl_register(PF_INET, RTM_DELADDR, inet_rtm_deladdr, NULL, 0);
2764 rtnl_register(PF_INET, RTM_GETADDR, NULL, inet_dump_ifaddr, 0);
2765 rtnl_register(PF_INET, RTM_GETNETCONF, inet_netconf_get_devconf,
2766 inet_netconf_dump_devconf, 0);
2767}