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Merge tag 'nfc-next-4.6-1' of git://git.kernel.org/pub/scm/linux/kernel/git/sameo...
[linux-2.6-block.git] / net / ipv4 / devinet.c
CommitLineData
1da177e4
LT		 1/*
2 * NET3 IP device support routines.
3 *
1da177e4
LT		 4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
8 *
9 * Derived from the IP parts of dev.c 1.0.19
02c30a84 10 * Authors: Ross Biro
1da177e4
LT		 11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 * Mark Evans, <evansmp@uhura.aston.ac.uk>
13 *
14 * Additional Authors:
15 * Alan Cox, <gw4pts@gw4pts.ampr.org>
16 * Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
17 *
18 * Changes:
19 * Alexey Kuznetsov: pa_* fields are replaced with ifaddr
20 * lists.
21 * Cyrus Durgin: updated for kmod
22 * Matthias Andree: in devinet_ioctl, compare label and
23 * address (4.4BSD alias style support),
24 * fall back to comparing just the label
25 * if no match found.
26 */
27
1da177e4
LT		 28
29#include <asm/uaccess.h>
1da177e4 30#include <linux/bitops.h>
4fc268d2 31#include <linux/capability.h>
1da177e4
LT		 32#include <linux/module.h>
33#include <linux/types.h>
34#include <linux/kernel.h>
1da177e4
LT		 35#include <linux/string.h>
36#include <linux/mm.h>
37#include <linux/socket.h>
38#include <linux/sockios.h>
39#include <linux/in.h>
40#include <linux/errno.h>
41#include <linux/interrupt.h>
1823730f 42#include <linux/if_addr.h>
1da177e4
LT		 43#include <linux/if_ether.h>
44#include <linux/inet.h>
45#include <linux/netdevice.h>
46#include <linux/etherdevice.h>
47#include <linux/skbuff.h>
1da177e4
LT		 48#include <linux/init.h>
49#include <linux/notifier.h>
50#include <linux/inetdevice.h>
51#include <linux/igmp.h>
5a0e3ad6 52#include <linux/slab.h>
fd23c3b3 53#include <linux/hash.h>
1da177e4
LT		 54#ifdef CONFIG_SYSCTL
55#include <linux/sysctl.h>
56#endif
57#include <linux/kmod.h>
edc9e748 58#include <linux/netconf.h>
1da177e4 59
14c85021 60#include <net/arp.h>
1da177e4
LT		 61#include <net/ip.h>
62#include <net/route.h>
63#include <net/ip_fib.h>
63f3444f 64#include <net/rtnetlink.h>
752d14dc 65#include <net/net_namespace.h>
5c766d64 66#include <net/addrconf.h>
1da177e4 67
406b6f97
DM		 68#include "fib_lookup.h"
69
0027ba84 70static struct ipv4_devconf ipv4_devconf = {
42f811b8 71 .data = {
02291680
EB		 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,
2690048c
WM		 76 [IPV4_DEVCONF_IGMPV2_UNSOLICITED_REPORT_INTERVAL - 1] = 10000 /*ms*/,
77 [IPV4_DEVCONF_IGMPV3_UNSOLICITED_REPORT_INTERVAL - 1] = 1000 /*ms*/,
42f811b8 78 },
1da177e4
LT		 79};
80
81static struct ipv4_devconf ipv4_devconf_dflt = {
42f811b8 82 .data = {
02291680
EB		 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,
2690048c
WM		 88 [IPV4_DEVCONF_IGMPV2_UNSOLICITED_REPORT_INTERVAL - 1] = 10000 /*ms*/,
89 [IPV4_DEVCONF_IGMPV3_UNSOLICITED_REPORT_INTERVAL - 1] = 1000 /*ms*/,
42f811b8 90 },
1da177e4
LT		 91};
92
9355bbd6
PE		 93#define IPV4_DEVCONF_DFLT(net, attr) \
94 IPV4_DEVCONF((*net->ipv4.devconf_dflt), attr)
42f811b8 95
ef7c79ed 96static const struct nla_policy ifa_ipv4_policy[IFA_MAX+1] = {
5c753978
TG		 97 [IFA_LOCAL] = { .type = NLA_U32 },
98 [IFA_ADDRESS] = { .type = NLA_U32 },
99 [IFA_BROADCAST] = { .type = NLA_U32 },
5176f91e 100 [IFA_LABEL] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 },
5c766d64 101 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
ad6c8135 102 [IFA_FLAGS] = { .type = NLA_U32 },
5c753978
TG		 103};
104
40384999
ED		 105#define IN4_ADDR_HSIZE_SHIFT 8
106#define IN4_ADDR_HSIZE (1U << IN4_ADDR_HSIZE_SHIFT)
107
fd23c3b3 108static struct hlist_head inet_addr_lst[IN4_ADDR_HSIZE];
fd23c3b3 109
6eada011 110static u32 inet_addr_hash(const struct net *net, __be32 addr)
fd23c3b3 111{
40384999 112 u32 val = (__force u32) addr ^ net_hash_mix(net);
fd23c3b3 113
40384999 114 return hash_32(val, IN4_ADDR_HSIZE_SHIFT);
fd23c3b3
DM		 115}
116
117static void inet_hash_insert(struct net *net, struct in_ifaddr *ifa)
118{
40384999 119 u32 hash = inet_addr_hash(net, ifa->ifa_local);
fd23c3b3 120
32a4be48 121 ASSERT_RTNL();
fd23c3b3 122 hlist_add_head_rcu(&ifa->hash, &inet_addr_lst[hash]);
fd23c3b3
DM		 123}
124
125static void inet_hash_remove(struct in_ifaddr *ifa)
126{
32a4be48 127 ASSERT_RTNL();
fd23c3b3 128 hlist_del_init_rcu(&ifa->hash);
fd23c3b3
DM		 129}
130
9435eb1c
DM		 131/**
132 * __ip_dev_find - find the first device with a given source address.
133 * @net: the net namespace
134 * @addr: the source address
135 * @devref: if true, take a reference on the found device
136 *
137 * If a caller uses devref=false, it should be protected by RCU, or RTNL
138 */
139struct net_device *__ip_dev_find(struct net *net, __be32 addr, bool devref)
140{
40384999 141 u32 hash = inet_addr_hash(net, addr);
9435eb1c
DM		 142 struct net_device *result = NULL;
143 struct in_ifaddr *ifa;
9435eb1c
DM		 144
145 rcu_read_lock();
b67bfe0d 146 hlist_for_each_entry_rcu(ifa, &inet_addr_lst[hash], hash) {
e066008b 147 if (ifa->ifa_local == addr) {
40384999
ED		 148 struct net_device *dev = ifa->ifa_dev->dev;
149
150 if (!net_eq(dev_net(dev), net))
151 continue;
9435eb1c
DM		 152 result = dev;
153 break;
154 }
155 }
406b6f97
DM		 156 if (!result) {
157 struct flowi4 fl4 = { .daddr = addr };
158 struct fib_result res = { 0 };
159 struct fib_table *local;
160
161 /* Fallback to FIB local table so that communication
162 * over loopback subnets work.
163 */
164 local = fib_get_table(net, RT_TABLE_LOCAL);
165 if (local &&
166 !fib_table_lookup(local, &fl4, &res, FIB_LOOKUP_NOREF) &&
167 res.type == RTN_LOCAL)
168 result = FIB_RES_DEV(res);
169 }
9435eb1c
DM		 170 if (result && devref)
171 dev_hold(result);
172 rcu_read_unlock();
173 return result;
174}
175EXPORT_SYMBOL(__ip_dev_find);
176
d6062cbb 177static void rtmsg_ifa(int event, struct in_ifaddr *, struct nlmsghdr *, u32);
1da177e4 178
e041c683 179static BLOCKING_NOTIFIER_HEAD(inetaddr_chain);
1da177e4
LT		 180static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
181 int destroy);
182#ifdef CONFIG_SYSCTL
20e61da7 183static int devinet_sysctl_register(struct in_device *idev);
51602b2a
PE		 184static void devinet_sysctl_unregister(struct in_device *idev);
185#else
20e61da7 186static int devinet_sysctl_register(struct in_device *idev)
51602b2a 187{
20e61da7 188 return 0;
51602b2a 189}
40384999 190static void devinet_sysctl_unregister(struct in_device *idev)
51602b2a
PE		 191{
192}
1da177e4
LT		 193#endif
194
195/* Locks all the inet devices. */
196
197static struct in_ifaddr *inet_alloc_ifa(void)
198{
93adcc80 199 return kzalloc(sizeof(struct in_ifaddr), GFP_KERNEL);
1da177e4
LT		 200}
201
202static void inet_rcu_free_ifa(struct rcu_head *head)
203{
204 struct in_ifaddr *ifa = container_of(head, struct in_ifaddr, rcu_head);
205 if (ifa->ifa_dev)
206 in_dev_put(ifa->ifa_dev);
207 kfree(ifa);
208}
209
40384999 210static void inet_free_ifa(struct in_ifaddr *ifa)
1da177e4
LT		 211{
212 call_rcu(&ifa->rcu_head, inet_rcu_free_ifa);
213}
214
215void in_dev_finish_destroy(struct in_device *idev)
216{
217 struct net_device *dev = idev->dev;
218
547b792c
IJ		 219 WARN_ON(idev->ifa_list);
220 WARN_ON(idev->mc_list);
e9897071 221 kfree(rcu_dereference_protected(idev->mc_hash, 1));
1da177e4 222#ifdef NET_REFCNT_DEBUG
91df42be 223 pr_debug("%s: %p=%s\n", __func__, idev, dev ? dev->name : "NIL");
1da177e4
LT		 224#endif
225 dev_put(dev);
226 if (!idev->dead)
9f9354b9
ED		 227 pr_err("Freeing alive in_device %p\n", idev);
228 else
1da177e4 229 kfree(idev);
1da177e4 230}
9f9354b9 231EXPORT_SYMBOL(in_dev_finish_destroy);
1da177e4 232
71e27da9 233static struct in_device *inetdev_init(struct net_device *dev)
1da177e4
LT		 234{
235 struct in_device *in_dev;
20e61da7 236 int err = -ENOMEM;
1da177e4
LT		 237
238 ASSERT_RTNL();
239
0da974f4 240 in_dev = kzalloc(sizeof(*in_dev), GFP_KERNEL);
1da177e4
LT		 241 if (!in_dev)
242 goto out;
c346dca1 243 memcpy(&in_dev->cnf, dev_net(dev)->ipv4.devconf_dflt,
9355bbd6 244 sizeof(in_dev->cnf));
1da177e4
LT		 245 in_dev->cnf.sysctl = NULL;
246 in_dev->dev = dev;
9f9354b9
ED		 247 in_dev->arp_parms = neigh_parms_alloc(dev, &arp_tbl);
248 if (!in_dev->arp_parms)
1da177e4 249 goto out_kfree;
0187bdfb
BH		 250 if (IPV4_DEVCONF(in_dev->cnf, FORWARDING))
251 dev_disable_lro(dev);
1da177e4
LT		 252 /* Reference in_dev->dev */
253 dev_hold(dev);
30c4cf57 254 /* Account for reference dev->ip_ptr (below) */
1da177e4 255 in_dev_hold(in_dev);
1da177e4 256
20e61da7
WC		 257 err = devinet_sysctl_register(in_dev);
258 if (err) {
259 in_dev->dead = 1;
260 in_dev_put(in_dev);
261 in_dev = NULL;
262 goto out;
263 }
1da177e4
LT		 264 ip_mc_init_dev(in_dev);
265 if (dev->flags & IFF_UP)
266 ip_mc_up(in_dev);
483479ec 267
30c4cf57 268 /* we can receive as soon as ip_ptr is set -- do this last */
cf778b00 269 rcu_assign_pointer(dev->ip_ptr, in_dev);
483479ec 270out:
20e61da7 271 return in_dev ?: ERR_PTR(err);
1da177e4
LT		 272out_kfree:
273 kfree(in_dev);
274 in_dev = NULL;
275 goto out;
276}
277
278static void in_dev_rcu_put(struct rcu_head *head)
279{
280 struct in_device *idev = container_of(head, struct in_device, rcu_head);
281 in_dev_put(idev);
282}
283
284static void inetdev_destroy(struct in_device *in_dev)
285{
286 struct in_ifaddr *ifa;
287 struct net_device *dev;
288
289 ASSERT_RTNL();
290
291 dev = in_dev->dev;
1da177e4
LT		 292
293 in_dev->dead = 1;
294
295 ip_mc_destroy_dev(in_dev);
296
297 while ((ifa = in_dev->ifa_list) != NULL) {
298 inet_del_ifa(in_dev, &in_dev->ifa_list, 0);
299 inet_free_ifa(ifa);
300 }
301
a9b3cd7f 302 RCU_INIT_POINTER(dev->ip_ptr, NULL);
1da177e4 303
51602b2a 304 devinet_sysctl_unregister(in_dev);
1da177e4
LT		 305 neigh_parms_release(&arp_tbl, in_dev->arp_parms);
306 arp_ifdown(dev);
307
308 call_rcu(&in_dev->rcu_head, in_dev_rcu_put);
309}
310
ff428d72 311int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b)
1da177e4
LT		 312{
313 rcu_read_lock();
314 for_primary_ifa(in_dev) {
315 if (inet_ifa_match(a, ifa)) {
316 if (!b || inet_ifa_match(b, ifa)) {
317 rcu_read_unlock();
318 return 1;
319 }
320 }
321 } endfor_ifa(in_dev);
322 rcu_read_unlock();
323 return 0;
324}
325
d6062cbb 326static void __inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
15e47304 327 int destroy, struct nlmsghdr *nlh, u32 portid)
1da177e4 328{
8f937c60 329 struct in_ifaddr *promote = NULL;
0ff60a45
JHS		 330 struct in_ifaddr *ifa, *ifa1 = *ifap;
331 struct in_ifaddr *last_prim = in_dev->ifa_list;
332 struct in_ifaddr *prev_prom = NULL;
333 int do_promote = IN_DEV_PROMOTE_SECONDARIES(in_dev);
1da177e4
LT		 334
335 ASSERT_RTNL();
336
e905a9ed 337 /* 1. Deleting primary ifaddr forces deletion all secondaries
8f937c60
HW		 338 * unless alias promotion is set
339 **/
1da177e4
LT		 340
341 if (!(ifa1->ifa_flags & IFA_F_SECONDARY)) {
1da177e4
LT		 342 struct in_ifaddr **ifap1 = &ifa1->ifa_next;
343
344 while ((ifa = *ifap1) != NULL) {
e905a9ed 345 if (!(ifa->ifa_flags & IFA_F_SECONDARY) &&
0ff60a45
JHS		 346 ifa1->ifa_scope <= ifa->ifa_scope)
347 last_prim = ifa;
348
1da177e4
LT		 349 if (!(ifa->ifa_flags & IFA_F_SECONDARY) ||
350 ifa1->ifa_mask != ifa->ifa_mask ||
351 !inet_ifa_match(ifa1->ifa_address, ifa)) {
352 ifap1 = &ifa->ifa_next;
0ff60a45 353 prev_prom = ifa;
1da177e4
LT		 354 continue;
355 }
356
0ff60a45 357 if (!do_promote) {
fd23c3b3 358 inet_hash_remove(ifa);
8f937c60 359 *ifap1 = ifa->ifa_next;
1da177e4 360
15e47304 361 rtmsg_ifa(RTM_DELADDR, ifa, nlh, portid);
e041c683
AS		 362 blocking_notifier_call_chain(&inetaddr_chain,
363 NETDEV_DOWN, ifa);
8f937c60
HW		 364 inet_free_ifa(ifa);
365 } else {
366 promote = ifa;
367 break;
368 }
1da177e4
LT		 369 }
370 }
371
2d230e2b
JA		 372 /* On promotion all secondaries from subnet are changing
373 * the primary IP, we must remove all their routes silently
374 * and later to add them back with new prefsrc. Do this
375 * while all addresses are on the device list.
376 */
377 for (ifa = promote; ifa; ifa = ifa->ifa_next) {
378 if (ifa1->ifa_mask == ifa->ifa_mask &&
379 inet_ifa_match(ifa1->ifa_address, ifa))
380 fib_del_ifaddr(ifa, ifa1);
381 }
382
1da177e4
LT		 383 /* 2. Unlink it */
384
385 *ifap = ifa1->ifa_next;
fd23c3b3 386 inet_hash_remove(ifa1);
1da177e4
LT		 387
388 /* 3. Announce address deletion */
389
390 /* Send message first, then call notifier.
391 At first sight, FIB update triggered by notifier
392 will refer to already deleted ifaddr, that could confuse
393 netlink listeners. It is not true: look, gated sees
394 that route deleted and if it still thinks that ifaddr
395 is valid, it will try to restore deleted routes... Grr.
396 So that, this order is correct.
397 */
15e47304 398 rtmsg_ifa(RTM_DELADDR, ifa1, nlh, portid);
e041c683 399 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa1);
1da177e4 400
0ff60a45 401 if (promote) {
04024b93 402 struct in_ifaddr *next_sec = promote->ifa_next;
0ff60a45
JHS		 403
404 if (prev_prom) {
405 prev_prom->ifa_next = promote->ifa_next;
406 promote->ifa_next = last_prim->ifa_next;
407 last_prim->ifa_next = promote;
408 }
8f937c60 409
8f937c60 410 promote->ifa_flags &= ~IFA_F_SECONDARY;
15e47304 411 rtmsg_ifa(RTM_NEWADDR, promote, nlh, portid);
e041c683
AS		 412 blocking_notifier_call_chain(&inetaddr_chain,
413 NETDEV_UP, promote);
04024b93 414 for (ifa = next_sec; ifa; ifa = ifa->ifa_next) {
0ff60a45
JHS		 415 if (ifa1->ifa_mask != ifa->ifa_mask ||
416 !inet_ifa_match(ifa1->ifa_address, ifa))
417 continue;
418 fib_add_ifaddr(ifa);
419 }
420
421 }
6363097c 422 if (destroy)
0ff60a45 423 inet_free_ifa(ifa1);
1da177e4
LT		 424}
425
d6062cbb
TG		 426static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
427 int destroy)
428{
429 __inet_del_ifa(in_dev, ifap, destroy, NULL, 0);
430}
431
5c766d64
JP		 432static void check_lifetime(struct work_struct *work);
433
434static DECLARE_DELAYED_WORK(check_lifetime_work, check_lifetime);
435
d6062cbb 436static int __inet_insert_ifa(struct in_ifaddr *ifa, struct nlmsghdr *nlh,
15e47304 437 u32 portid)
1da177e4
LT		 438{
439 struct in_device *in_dev = ifa->ifa_dev;
440 struct in_ifaddr *ifa1, **ifap, **last_primary;
441
442 ASSERT_RTNL();
443
444 if (!ifa->ifa_local) {
445 inet_free_ifa(ifa);
446 return 0;
447 }
448
449 ifa->ifa_flags &= ~IFA_F_SECONDARY;
450 last_primary = &in_dev->ifa_list;
451
452 for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL;
453 ifap = &ifa1->ifa_next) {
454 if (!(ifa1->ifa_flags & IFA_F_SECONDARY) &&
455 ifa->ifa_scope <= ifa1->ifa_scope)
456 last_primary = &ifa1->ifa_next;
457 if (ifa1->ifa_mask == ifa->ifa_mask &&
458 inet_ifa_match(ifa1->ifa_address, ifa)) {
459 if (ifa1->ifa_local == ifa->ifa_local) {
460 inet_free_ifa(ifa);
461 return -EEXIST;
462 }
463 if (ifa1->ifa_scope != ifa->ifa_scope) {
464 inet_free_ifa(ifa);
465 return -EINVAL;
466 }
467 ifa->ifa_flags |= IFA_F_SECONDARY;
468 }
469 }
470
471 if (!(ifa->ifa_flags & IFA_F_SECONDARY)) {
63862b5b 472 prandom_seed((__force u32) ifa->ifa_local);
1da177e4
LT		 473 ifap = last_primary;
474 }
475
476 ifa->ifa_next = *ifap;
477 *ifap = ifa;
478
fd23c3b3
DM		 479 inet_hash_insert(dev_net(in_dev->dev), ifa);
480
5c766d64 481 cancel_delayed_work(&check_lifetime_work);
906e073f 482 queue_delayed_work(system_power_efficient_wq, &check_lifetime_work, 0);
5c766d64 483
1da177e4
LT		 484 /* Send message first, then call notifier.
485 Notifier will trigger FIB update, so that
486 listeners of netlink will know about new ifaddr */
15e47304 487 rtmsg_ifa(RTM_NEWADDR, ifa, nlh, portid);
e041c683 488 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa);
1da177e4
LT		 489
490 return 0;
491}
492
d6062cbb
TG		 493static int inet_insert_ifa(struct in_ifaddr *ifa)
494{
495 return __inet_insert_ifa(ifa, NULL, 0);
496}
497
1da177e4
LT		 498static int inet_set_ifa(struct net_device *dev, struct in_ifaddr *ifa)
499{
e5ed6399 500 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1da177e4
LT		 501
502 ASSERT_RTNL();
503
504 if (!in_dev) {
71e27da9
HX		 505 inet_free_ifa(ifa);
506 return -ENOBUFS;
1da177e4 507 }
71e27da9 508 ipv4_devconf_setall(in_dev);
1d4c8c29 509 neigh_parms_data_state_setall(in_dev->arp_parms);
1da177e4 510 if (ifa->ifa_dev != in_dev) {
547b792c 511 WARN_ON(ifa->ifa_dev);
1da177e4
LT		 512 in_dev_hold(in_dev);
513 ifa->ifa_dev = in_dev;
514 }
f97c1e0c 515 if (ipv4_is_loopback(ifa->ifa_local))
1da177e4
LT		 516 ifa->ifa_scope = RT_SCOPE_HOST;
517 return inet_insert_ifa(ifa);
518}
519
8723e1b4
ED		 520/* Caller must hold RCU or RTNL :
521 * We dont take a reference on found in_device
522 */
7fee0ca2 523struct in_device *inetdev_by_index(struct net *net, int ifindex)
1da177e4
LT		 524{
525 struct net_device *dev;
526 struct in_device *in_dev = NULL;
c148fc2e
ED		 527
528 rcu_read_lock();
529 dev = dev_get_by_index_rcu(net, ifindex);
1da177e4 530 if (dev)
8723e1b4 531 in_dev = rcu_dereference_rtnl(dev->ip_ptr);
c148fc2e 532 rcu_read_unlock();
1da177e4
LT		 533 return in_dev;
534}
9f9354b9 535EXPORT_SYMBOL(inetdev_by_index);
1da177e4
LT		 536
537/* Called only from RTNL semaphored context. No locks. */
538
60cad5da
AV		 539struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix,
540 __be32 mask)
1da177e4
LT		 541{
542 ASSERT_RTNL();
543
544 for_primary_ifa(in_dev) {
545 if (ifa->ifa_mask == mask && inet_ifa_match(prefix, ifa))
546 return ifa;
547 } endfor_ifa(in_dev);
548 return NULL;
549}
550
93a714d6
MC		 551static int ip_mc_config(struct sock *sk, bool join, const struct in_ifaddr *ifa)
552{
553 struct ip_mreqn mreq = {
554 .imr_multiaddr.s_addr = ifa->ifa_address,
555 .imr_ifindex = ifa->ifa_dev->dev->ifindex,
556 };
557 int ret;
558
559 ASSERT_RTNL();
560
561 lock_sock(sk);
562 if (join)
54ff9ef3 563 ret = ip_mc_join_group(sk, &mreq);
93a714d6 564 else
54ff9ef3 565 ret = ip_mc_leave_group(sk, &mreq);
93a714d6
MC		 566 release_sock(sk);
567
568 return ret;
569}
570
661d2967 571static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 572{
3b1e0a65 573 struct net *net = sock_net(skb->sk);
dfdd5fd4 574 struct nlattr *tb[IFA_MAX+1];
1da177e4 575 struct in_device *in_dev;
dfdd5fd4 576 struct ifaddrmsg *ifm;
1da177e4 577 struct in_ifaddr *ifa, **ifap;
dfdd5fd4 578 int err = -EINVAL;
1da177e4
LT		 579
580 ASSERT_RTNL();
581
dfdd5fd4
TG		 582 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy);
583 if (err < 0)
584 goto errout;
585
586 ifm = nlmsg_data(nlh);
7fee0ca2 587 in_dev = inetdev_by_index(net, ifm->ifa_index);
51456b29 588 if (!in_dev) {
dfdd5fd4
TG		 589 err = -ENODEV;
590 goto errout;
591 }
592
1da177e4
LT		 593 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
594 ifap = &ifa->ifa_next) {
dfdd5fd4 595 if (tb[IFA_LOCAL] &&
67b61f6c 596 ifa->ifa_local != nla_get_in_addr(tb[IFA_LOCAL]))
dfdd5fd4
TG		 597 continue;
598
599 if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label))
1da177e4 600 continue;
dfdd5fd4
TG		 601
602 if (tb[IFA_ADDRESS] &&
603 (ifm->ifa_prefixlen != ifa->ifa_prefixlen ||
67b61f6c 604 !inet_ifa_match(nla_get_in_addr(tb[IFA_ADDRESS]), ifa)))
dfdd5fd4
TG		 605 continue;
606
93a714d6
MC		 607 if (ipv4_is_multicast(ifa->ifa_address))
608 ip_mc_config(net->ipv4.mc_autojoin_sk, false, ifa);
15e47304 609 __inet_del_ifa(in_dev, ifap, 1, nlh, NETLINK_CB(skb).portid);
1da177e4
LT		 610 return 0;
611 }
dfdd5fd4
TG		 612
613 err = -EADDRNOTAVAIL;
614errout:
615 return err;
1da177e4
LT		 616}
617
5c766d64
JP		 618#define INFINITY_LIFE_TIME 0xFFFFFFFF
619
620static void check_lifetime(struct work_struct *work)
621{
622 unsigned long now, next, next_sec, next_sched;
623 struct in_ifaddr *ifa;
c988d1e8 624 struct hlist_node *n;
5c766d64
JP		 625 int i;
626
627 now = jiffies;
628 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
629
5c766d64 630 for (i = 0; i < IN4_ADDR_HSIZE; i++) {
c988d1e8
JP		 631 bool change_needed = false;
632
633 rcu_read_lock();
b67bfe0d 634 hlist_for_each_entry_rcu(ifa, &inet_addr_lst[i], hash) {
5c766d64
JP		 635 unsigned long age;
636
637 if (ifa->ifa_flags & IFA_F_PERMANENT)
638 continue;
639
640 /* We try to batch several events at once. */
641 age = (now - ifa->ifa_tstamp +
642 ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
643
644 if (ifa->ifa_valid_lft != INFINITY_LIFE_TIME &&
645 age >= ifa->ifa_valid_lft) {
c988d1e8 646 change_needed = true;
5c766d64
JP		 647 } else if (ifa->ifa_preferred_lft ==
648 INFINITY_LIFE_TIME) {
649 continue;
650 } else if (age >= ifa->ifa_preferred_lft) {
651 if (time_before(ifa->ifa_tstamp +
652 ifa->ifa_valid_lft * HZ, next))
653 next = ifa->ifa_tstamp +
654 ifa->ifa_valid_lft * HZ;
655
c988d1e8
JP		 656 if (!(ifa->ifa_flags & IFA_F_DEPRECATED))
657 change_needed = true;
5c766d64
JP		 658 } else if (time_before(ifa->ifa_tstamp +
659 ifa->ifa_preferred_lft * HZ,
660 next)) {
661 next = ifa->ifa_tstamp +
662 ifa->ifa_preferred_lft * HZ;
663 }
664 }
c988d1e8
JP		 665 rcu_read_unlock();
666 if (!change_needed)
667 continue;
668 rtnl_lock();
669 hlist_for_each_entry_safe(ifa, n, &inet_addr_lst[i], hash) {
670 unsigned long age;
671
672 if (ifa->ifa_flags & IFA_F_PERMANENT)
673 continue;
674
675 /* We try to batch several events at once. */
676 age = (now - ifa->ifa_tstamp +
677 ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
678
679 if (ifa->ifa_valid_lft != INFINITY_LIFE_TIME &&
680 age >= ifa->ifa_valid_lft) {
681 struct in_ifaddr **ifap;
682
683 for (ifap = &ifa->ifa_dev->ifa_list;
684 *ifap != NULL; ifap = &(*ifap)->ifa_next) {
685 if (*ifap == ifa) {
686 inet_del_ifa(ifa->ifa_dev,
687 ifap, 1);
688 break;
689 }
690 }
691 } else if (ifa->ifa_preferred_lft !=
692 INFINITY_LIFE_TIME &&
693 age >= ifa->ifa_preferred_lft &&
694 !(ifa->ifa_flags & IFA_F_DEPRECATED)) {
695 ifa->ifa_flags |= IFA_F_DEPRECATED;
696 rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0);
697 }
698 }
699 rtnl_unlock();
5c766d64 700 }
5c766d64
JP		 701
702 next_sec = round_jiffies_up(next);
703 next_sched = next;
704
705 /* If rounded timeout is accurate enough, accept it. */
706 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
707 next_sched = next_sec;
708
709 now = jiffies;
710 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
711 if (time_before(next_sched, now + ADDRCONF_TIMER_FUZZ_MAX))
712 next_sched = now + ADDRCONF_TIMER_FUZZ_MAX;
713
906e073f 714 queue_delayed_work(system_power_efficient_wq, &check_lifetime_work,
715 next_sched - now);
5c766d64
JP		 716}
717
718static void set_ifa_lifetime(struct in_ifaddr *ifa, __u32 valid_lft,
719 __u32 prefered_lft)
720{
721 unsigned long timeout;
722
723 ifa->ifa_flags &= ~(IFA_F_PERMANENT | IFA_F_DEPRECATED);
724
725 timeout = addrconf_timeout_fixup(valid_lft, HZ);
726 if (addrconf_finite_timeout(timeout))
727 ifa->ifa_valid_lft = timeout;
728 else
729 ifa->ifa_flags |= IFA_F_PERMANENT;
730
731 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
732 if (addrconf_finite_timeout(timeout)) {
733 if (timeout == 0)
734 ifa->ifa_flags |= IFA_F_DEPRECATED;
735 ifa->ifa_preferred_lft = timeout;
736 }
737 ifa->ifa_tstamp = jiffies;
738 if (!ifa->ifa_cstamp)
739 ifa->ifa_cstamp = ifa->ifa_tstamp;
740}
741
742static struct in_ifaddr *rtm_to_ifaddr(struct net *net, struct nlmsghdr *nlh,
743 __u32 *pvalid_lft, __u32 *pprefered_lft)
1da177e4 744{
5c753978
TG		 745 struct nlattr *tb[IFA_MAX+1];
746 struct in_ifaddr *ifa;
747 struct ifaddrmsg *ifm;
1da177e4
LT		 748 struct net_device *dev;
749 struct in_device *in_dev;
7b218574 750 int err;
1da177e4 751
5c753978
TG		 752 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy);
753 if (err < 0)
754 goto errout;
1da177e4 755
5c753978 756 ifm = nlmsg_data(nlh);
7b218574 757 err = -EINVAL;
51456b29 758 if (ifm->ifa_prefixlen > 32 || !tb[IFA_LOCAL])
5c753978 759 goto errout;
1da177e4 760
4b8aa9ab 761 dev = __dev_get_by_index(net, ifm->ifa_index);
7b218574 762 err = -ENODEV;
51456b29 763 if (!dev)
5c753978 764 goto errout;
1da177e4 765
5c753978 766 in_dev = __in_dev_get_rtnl(dev);
7b218574 767 err = -ENOBUFS;
51456b29 768 if (!in_dev)
71e27da9 769 goto errout;
1da177e4 770
5c753978 771 ifa = inet_alloc_ifa();
51456b29 772 if (!ifa)
5c753978
TG		 773 /*
774 * A potential indev allocation can be left alive, it stays
775 * assigned to its device and is destroy with it.
776 */
5c753978 777 goto errout;
5c753978 778
a4e65d36 779 ipv4_devconf_setall(in_dev);
1d4c8c29 780 neigh_parms_data_state_setall(in_dev->arp_parms);
5c753978
TG		 781 in_dev_hold(in_dev);
782
51456b29 783 if (!tb[IFA_ADDRESS])
5c753978 784 tb[IFA_ADDRESS] = tb[IFA_LOCAL];
1da177e4 785
fd23c3b3 786 INIT_HLIST_NODE(&ifa->hash);
1da177e4
LT		 787 ifa->ifa_prefixlen = ifm->ifa_prefixlen;
788 ifa->ifa_mask = inet_make_mask(ifm->ifa_prefixlen);
ad6c8135
JP		 789 ifa->ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) :
790 ifm->ifa_flags;
1da177e4 791 ifa->ifa_scope = ifm->ifa_scope;
5c753978
TG		 792 ifa->ifa_dev = in_dev;
793
67b61f6c
JB		 794 ifa->ifa_local = nla_get_in_addr(tb[IFA_LOCAL]);
795 ifa->ifa_address = nla_get_in_addr(tb[IFA_ADDRESS]);
5c753978
TG		 796
797 if (tb[IFA_BROADCAST])
67b61f6c 798 ifa->ifa_broadcast = nla_get_in_addr(tb[IFA_BROADCAST]);
5c753978 799
5c753978
TG		 800 if (tb[IFA_LABEL])
801 nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ);
1da177e4
LT		 802 else
803 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
804
5c766d64
JP		 805 if (tb[IFA_CACHEINFO]) {
806 struct ifa_cacheinfo *ci;
807
808 ci = nla_data(tb[IFA_CACHEINFO]);
809 if (!ci->ifa_valid || ci->ifa_prefered > ci->ifa_valid) {
810 err = -EINVAL;
446266b0 811 goto errout_free;
5c766d64
JP		 812 }
813 *pvalid_lft = ci->ifa_valid;
814 *pprefered_lft = ci->ifa_prefered;
815 }
816
5c753978
TG		 817 return ifa;
818
446266b0
DB		 819errout_free:
820 inet_free_ifa(ifa);
5c753978
TG		 821errout:
822 return ERR_PTR(err);
823}
824
5c766d64
JP		 825static struct in_ifaddr *find_matching_ifa(struct in_ifaddr *ifa)
826{
827 struct in_device *in_dev = ifa->ifa_dev;
828 struct in_ifaddr *ifa1, **ifap;
829
830 if (!ifa->ifa_local)
831 return NULL;
832
833 for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL;
834 ifap = &ifa1->ifa_next) {
835 if (ifa1->ifa_mask == ifa->ifa_mask &&
836 inet_ifa_match(ifa1->ifa_address, ifa) &&
837 ifa1->ifa_local == ifa->ifa_local)
838 return ifa1;
839 }
840 return NULL;
841}
842
661d2967 843static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
5c753978 844{
3b1e0a65 845 struct net *net = sock_net(skb->sk);
5c753978 846 struct in_ifaddr *ifa;
5c766d64
JP		 847 struct in_ifaddr *ifa_existing;
848 __u32 valid_lft = INFINITY_LIFE_TIME;
849 __u32 prefered_lft = INFINITY_LIFE_TIME;
5c753978
TG		 850
851 ASSERT_RTNL();
852
5c766d64 853 ifa = rtm_to_ifaddr(net, nlh, &valid_lft, &prefered_lft);
5c753978
TG		 854 if (IS_ERR(ifa))
855 return PTR_ERR(ifa);
856
5c766d64
JP		 857 ifa_existing = find_matching_ifa(ifa);
858 if (!ifa_existing) {
859 /* It would be best to check for !NLM_F_CREATE here but
614d056c 860 * userspace already relies on not having to provide this.
5c766d64
JP		 861 */
862 set_ifa_lifetime(ifa, valid_lft, prefered_lft);
93a714d6
MC		 863 if (ifa->ifa_flags & IFA_F_MCAUTOJOIN) {
864 int ret = ip_mc_config(net->ipv4.mc_autojoin_sk,
865 true, ifa);
866
867 if (ret < 0) {
868 inet_free_ifa(ifa);
869 return ret;
870 }
871 }
5c766d64
JP		 872 return __inet_insert_ifa(ifa, nlh, NETLINK_CB(skb).portid);
873 } else {
874 inet_free_ifa(ifa);
875
876 if (nlh->nlmsg_flags & NLM_F_EXCL ||
877 !(nlh->nlmsg_flags & NLM_F_REPLACE))
878 return -EEXIST;
34e2ed34
JP		 879 ifa = ifa_existing;
880 set_ifa_lifetime(ifa, valid_lft, prefered_lft);
05a324b9 881 cancel_delayed_work(&check_lifetime_work);
906e073f 882 queue_delayed_work(system_power_efficient_wq,
883 &check_lifetime_work, 0);
34e2ed34 884 rtmsg_ifa(RTM_NEWADDR, ifa, nlh, NETLINK_CB(skb).portid);
5c766d64
JP		 885 }
886 return 0;
1da177e4
LT		 887}
888
889/*
890 * Determine a default network mask, based on the IP address.
891 */
892
40384999 893static int inet_abc_len(__be32 addr)
1da177e4
LT		 894{
895 int rc = -1; /* Something else, probably a multicast. */
896
f97c1e0c 897 if (ipv4_is_zeronet(addr))
e905a9ed 898 rc = 0;
1da177e4 899 else {
714e85be 900 __u32 haddr = ntohl(addr);
1da177e4 901
714e85be 902 if (IN_CLASSA(haddr))
1da177e4 903 rc = 8;
714e85be 904 else if (IN_CLASSB(haddr))
1da177e4 905 rc = 16;
714e85be 906 else if (IN_CLASSC(haddr))
1da177e4
LT		 907 rc = 24;
908 }
909
e905a9ed 910 return rc;
1da177e4
LT		 911}
912
913
e5b13cb1 914int devinet_ioctl(struct net *net, unsigned int cmd, void __user *arg)
1da177e4
LT		 915{
916 struct ifreq ifr;
917 struct sockaddr_in sin_orig;
918 struct sockaddr_in *sin = (struct sockaddr_in *)&ifr.ifr_addr;
919 struct in_device *in_dev;
920 struct in_ifaddr **ifap = NULL;
921 struct in_ifaddr *ifa = NULL;
922 struct net_device *dev;
923 char *colon;
924 int ret = -EFAULT;
925 int tryaddrmatch = 0;
926
927 /*
928 * Fetch the caller's info block into kernel space
929 */
930
931 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
932 goto out;
933 ifr.ifr_name[IFNAMSIZ - 1] = 0;
934
935 /* save original address for comparison */
936 memcpy(&sin_orig, sin, sizeof(*sin));
937
938 colon = strchr(ifr.ifr_name, ':');
939 if (colon)
940 *colon = 0;
941
e5b13cb1 942 dev_load(net, ifr.ifr_name);
1da177e4 943
132adf54 944 switch (cmd) {
1da177e4
LT		 945 case SIOCGIFADDR: /* Get interface address */
946 case SIOCGIFBRDADDR: /* Get the broadcast address */
947 case SIOCGIFDSTADDR: /* Get the destination address */
948 case SIOCGIFNETMASK: /* Get the netmask for the interface */
949 /* Note that these ioctls will not sleep,
950 so that we do not impose a lock.
951 One day we will be forced to put shlock here (I mean SMP)
952 */
953 tryaddrmatch = (sin_orig.sin_family == AF_INET);
954 memset(sin, 0, sizeof(*sin));
955 sin->sin_family = AF_INET;
956 break;
957
958 case SIOCSIFFLAGS:
bf5b30b8 959 ret = -EPERM;
52e804c6 960 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 961 goto out;
962 break;
963 case SIOCSIFADDR: /* Set interface address (and family) */
964 case SIOCSIFBRDADDR: /* Set the broadcast address */
965 case SIOCSIFDSTADDR: /* Set the destination address */
966 case SIOCSIFNETMASK: /* Set the netmask for the interface */
bf5b30b8 967 ret = -EPERM;
52e804c6 968 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 969 goto out;
970 ret = -EINVAL;
971 if (sin->sin_family != AF_INET)
972 goto out;
973 break;
974 default:
975 ret = -EINVAL;
976 goto out;
977 }
978
979 rtnl_lock();
980
981 ret = -ENODEV;
9f9354b9
ED		 982 dev = __dev_get_by_name(net, ifr.ifr_name);
983 if (!dev)
1da177e4
LT		 984 goto done;
985
986 if (colon)
987 *colon = ':';
988
9f9354b9
ED		 989 in_dev = __in_dev_get_rtnl(dev);
990 if (in_dev) {
1da177e4
LT		 991 if (tryaddrmatch) {
992 /* Matthias Andree */
993 /* compare label and address (4.4BSD style) */
994 /* note: we only do this for a limited set of ioctls
995 and only if the original address family was AF_INET.
996 This is checked above. */
997 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
998 ifap = &ifa->ifa_next) {
999 if (!strcmp(ifr.ifr_name, ifa->ifa_label) &&
1000 sin_orig.sin_addr.s_addr ==
6c91afe1 1001 ifa->ifa_local) {
1da177e4
LT		 1002 break; /* found */
1003 }
1004 }
1005 }
1006 /* we didn't get a match, maybe the application is
1007 4.3BSD-style and passed in junk so we fall back to
1008 comparing just the label */
1009 if (!ifa) {
1010 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
1011 ifap = &ifa->ifa_next)
1012 if (!strcmp(ifr.ifr_name, ifa->ifa_label))
1013 break;
1014 }
1015 }
1016
1017 ret = -EADDRNOTAVAIL;
1018 if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS)
1019 goto done;
1020
132adf54 1021 switch (cmd) {
1da177e4
LT		 1022 case SIOCGIFADDR: /* Get interface address */
1023 sin->sin_addr.s_addr = ifa->ifa_local;
1024 goto rarok;
1025
1026 case SIOCGIFBRDADDR: /* Get the broadcast address */
1027 sin->sin_addr.s_addr = ifa->ifa_broadcast;
1028 goto rarok;
1029
1030 case SIOCGIFDSTADDR: /* Get the destination address */
1031 sin->sin_addr.s_addr = ifa->ifa_address;
1032 goto rarok;
1033
1034 case SIOCGIFNETMASK: /* Get the netmask for the interface */
1035 sin->sin_addr.s_addr = ifa->ifa_mask;
1036 goto rarok;
1037
1038 case SIOCSIFFLAGS:
1039 if (colon) {
1040 ret = -EADDRNOTAVAIL;
1041 if (!ifa)
1042 break;
1043 ret = 0;
1044 if (!(ifr.ifr_flags & IFF_UP))
1045 inet_del_ifa(in_dev, ifap, 1);
1046 break;
1047 }
1048 ret = dev_change_flags(dev, ifr.ifr_flags);
1049 break;
1050
1051 case SIOCSIFADDR: /* Set interface address (and family) */
1052 ret = -EINVAL;
1053 if (inet_abc_len(sin->sin_addr.s_addr) < 0)
1054 break;
1055
1056 if (!ifa) {
1057 ret = -ENOBUFS;
9f9354b9
ED		 1058 ifa = inet_alloc_ifa();
1059 if (!ifa)
1da177e4 1060 break;
c7e2e1d7 1061 INIT_HLIST_NODE(&ifa->hash);
1da177e4
LT		 1062 if (colon)
1063 memcpy(ifa->ifa_label, ifr.ifr_name, IFNAMSIZ);
1064 else
1065 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1066 } else {
1067 ret = 0;
1068 if (ifa->ifa_local == sin->sin_addr.s_addr)
1069 break;
1070 inet_del_ifa(in_dev, ifap, 0);
1071 ifa->ifa_broadcast = 0;
148f9729 1072 ifa->ifa_scope = 0;
1da177e4
LT		 1073 }
1074
1075 ifa->ifa_address = ifa->ifa_local = sin->sin_addr.s_addr;
1076
1077 if (!(dev->flags & IFF_POINTOPOINT)) {
1078 ifa->ifa_prefixlen = inet_abc_len(ifa->ifa_address);
1079 ifa->ifa_mask = inet_make_mask(ifa->ifa_prefixlen);
1080 if ((dev->flags & IFF_BROADCAST) &&
1081 ifa->ifa_prefixlen < 31)
1082 ifa->ifa_broadcast = ifa->ifa_address |
1083 ~ifa->ifa_mask;
1084 } else {
1085 ifa->ifa_prefixlen = 32;
1086 ifa->ifa_mask = inet_make_mask(32);
1087 }
5c766d64 1088 set_ifa_lifetime(ifa, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 1089 ret = inet_set_ifa(dev, ifa);
1090 break;
1091
1092 case SIOCSIFBRDADDR: /* Set the broadcast address */
1093 ret = 0;
1094 if (ifa->ifa_broadcast != sin->sin_addr.s_addr) {
1095 inet_del_ifa(in_dev, ifap, 0);
1096 ifa->ifa_broadcast = sin->sin_addr.s_addr;
1097 inet_insert_ifa(ifa);
1098 }
1099 break;
1100
1101 case SIOCSIFDSTADDR: /* Set the destination address */
1102 ret = 0;
1103 if (ifa->ifa_address == sin->sin_addr.s_addr)
1104 break;
1105 ret = -EINVAL;
1106 if (inet_abc_len(sin->sin_addr.s_addr) < 0)
1107 break;
1108 ret = 0;
1109 inet_del_ifa(in_dev, ifap, 0);
1110 ifa->ifa_address = sin->sin_addr.s_addr;
1111 inet_insert_ifa(ifa);
1112 break;
1113
1114 case SIOCSIFNETMASK: /* Set the netmask for the interface */
1115
1116 /*
1117 * The mask we set must be legal.
1118 */
1119 ret = -EINVAL;
1120 if (bad_mask(sin->sin_addr.s_addr, 0))
1121 break;
1122 ret = 0;
1123 if (ifa->ifa_mask != sin->sin_addr.s_addr) {
a144ea4b 1124 __be32 old_mask = ifa->ifa_mask;
1da177e4
LT		 1125 inet_del_ifa(in_dev, ifap, 0);
1126 ifa->ifa_mask = sin->sin_addr.s_addr;
1127 ifa->ifa_prefixlen = inet_mask_len(ifa->ifa_mask);
1128
1129 /* See if current broadcast address matches
1130 * with current netmask, then recalculate
1131 * the broadcast address. Otherwise it's a
1132 * funny address, so don't touch it since
1133 * the user seems to know what (s)he's doing...
1134 */
1135 if ((dev->flags & IFF_BROADCAST) &&
1136 (ifa->ifa_prefixlen < 31) &&
1137 (ifa->ifa_broadcast ==
dcab5e1e 1138 (ifa->ifa_local|~old_mask))) {
1da177e4
LT		 1139 ifa->ifa_broadcast = (ifa->ifa_local |
1140 ~sin->sin_addr.s_addr);
1141 }
1142 inet_insert_ifa(ifa);
1143 }
1144 break;
1145 }
1146done:
1147 rtnl_unlock();
1148out:
1149 return ret;
1150rarok:
1151 rtnl_unlock();
1152 ret = copy_to_user(arg, &ifr, sizeof(struct ifreq)) ? -EFAULT : 0;
1153 goto out;
1154}
1155
1156static int inet_gifconf(struct net_device *dev, char __user *buf, int len)
1157{
e5ed6399 1158 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1da177e4
LT		 1159 struct in_ifaddr *ifa;
1160 struct ifreq ifr;
1161 int done = 0;
1162
9f9354b9 1163 if (!in_dev)
1da177e4
LT		 1164 goto out;
1165
9f9354b9 1166 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1da177e4
LT		 1167 if (!buf) {
1168 done += sizeof(ifr);
1169 continue;
1170 }
1171 if (len < (int) sizeof(ifr))
1172 break;
1173 memset(&ifr, 0, sizeof(struct ifreq));
4299c8a9 1174 strcpy(ifr.ifr_name, ifa->ifa_label);
1da177e4
LT		 1175
1176 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_family = AF_INET;
1177 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_addr.s_addr =
1178 ifa->ifa_local;
1179
1180 if (copy_to_user(buf, &ifr, sizeof(struct ifreq))) {
1181 done = -EFAULT;
1182 break;
1183 }
1184 buf += sizeof(struct ifreq);
1185 len -= sizeof(struct ifreq);
1186 done += sizeof(struct ifreq);
1187 }
1188out:
1189 return done;
1190}
1191
a61ced5d 1192__be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope)
1da177e4 1193{
a61ced5d 1194 __be32 addr = 0;
1da177e4 1195 struct in_device *in_dev;
c346dca1 1196 struct net *net = dev_net(dev);
3f2fb9a8 1197 int master_idx;
1da177e4
LT		 1198
1199 rcu_read_lock();
e5ed6399 1200 in_dev = __in_dev_get_rcu(dev);
1da177e4
LT		 1201 if (!in_dev)
1202 goto no_in_dev;
1203
1204 for_primary_ifa(in_dev) {
1205 if (ifa->ifa_scope > scope)
1206 continue;
1207 if (!dst || inet_ifa_match(dst, ifa)) {
1208 addr = ifa->ifa_local;
1209 break;
1210 }
1211 if (!addr)
1212 addr = ifa->ifa_local;
1213 } endfor_ifa(in_dev);
1da177e4
LT		 1214
1215 if (addr)
c6d14c84 1216 goto out_unlock;
9f9354b9 1217no_in_dev:
3f2fb9a8 1218 master_idx = l3mdev_master_ifindex_rcu(dev);
1da177e4 1219
17b693cd
DL		 1220 /* For VRFs, the VRF device takes the place of the loopback device,
1221 * with addresses on it being preferred. Note in such cases the
1222 * loopback device will be among the devices that fail the master_idx
1223 * equality check in the loop below.
1224 */
1225 if (master_idx &&
1226 (dev = dev_get_by_index_rcu(net, master_idx)) &&
1227 (in_dev = __in_dev_get_rcu(dev))) {
1228 for_primary_ifa(in_dev) {
1229 if (ifa->ifa_scope != RT_SCOPE_LINK &&
1230 ifa->ifa_scope <= scope) {
1231 addr = ifa->ifa_local;
1232 goto out_unlock;
1233 }
1234 } endfor_ifa(in_dev);
1235 }
1236
1da177e4 1237 /* Not loopback addresses on loopback should be preferred
ca9f1fd2 1238 in this case. It is important that lo is the first interface
1da177e4
LT		 1239 in dev_base list.
1240 */
c6d14c84 1241 for_each_netdev_rcu(net, dev) {
3f2fb9a8
DA		 1242 if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1243 continue;
1244
9f9354b9
ED		 1245 in_dev = __in_dev_get_rcu(dev);
1246 if (!in_dev)
1da177e4
LT		 1247 continue;
1248
1249 for_primary_ifa(in_dev) {
1250 if (ifa->ifa_scope != RT_SCOPE_LINK &&
1251 ifa->ifa_scope <= scope) {
1252 addr = ifa->ifa_local;
c6d14c84 1253 goto out_unlock;
1da177e4
LT		 1254 }
1255 } endfor_ifa(in_dev);
1256 }
c6d14c84 1257out_unlock:
1da177e4 1258 rcu_read_unlock();
1da177e4
LT		 1259 return addr;
1260}
9f9354b9 1261EXPORT_SYMBOL(inet_select_addr);
1da177e4 1262
60cad5da
AV		 1263static __be32 confirm_addr_indev(struct in_device *in_dev, __be32 dst,
1264 __be32 local, int scope)
1da177e4
LT		 1265{
1266 int same = 0;
a144ea4b 1267 __be32 addr = 0;
1da177e4
LT		 1268
1269 for_ifa(in_dev) {
1270 if (!addr &&
1271 (local == ifa->ifa_local || !local) &&
1272 ifa->ifa_scope <= scope) {
1273 addr = ifa->ifa_local;
1274 if (same)
1275 break;
1276 }
1277 if (!same) {
1278 same = (!local || inet_ifa_match(local, ifa)) &&
1279 (!dst || inet_ifa_match(dst, ifa));
1280 if (same && addr) {
1281 if (local || !dst)
1282 break;
1283 /* Is the selected addr into dst subnet? */
1284 if (inet_ifa_match(addr, ifa))
1285 break;
1286 /* No, then can we use new local src? */
1287 if (ifa->ifa_scope <= scope) {
1288 addr = ifa->ifa_local;
1289 break;
1290 }
1291 /* search for large dst subnet for addr */
1292 same = 0;
1293 }
1294 }
1295 } endfor_ifa(in_dev);
1296
9f9354b9 1297 return same ? addr : 0;
1da177e4
LT		 1298}
1299
1300/*
1301 * Confirm that local IP address exists using wildcards:
b601fa19
ND		 1302 * - net: netns to check, cannot be NULL
1303 * - in_dev: only on this interface, NULL=any interface
1da177e4
LT		 1304 * - dst: only in the same subnet as dst, 0=any dst
1305 * - local: address, 0=autoselect the local address
1306 * - scope: maximum allowed scope value for the local address
1307 */
b601fa19 1308__be32 inet_confirm_addr(struct net *net, struct in_device *in_dev,
9bd85e32 1309 __be32 dst, __be32 local, int scope)
1da177e4 1310{
60cad5da 1311 __be32 addr = 0;
9bd85e32 1312 struct net_device *dev;
1da177e4 1313
00db4124 1314 if (in_dev)
9bd85e32 1315 return confirm_addr_indev(in_dev, dst, local, scope);
1da177e4 1316
1da177e4 1317 rcu_read_lock();
c6d14c84 1318 for_each_netdev_rcu(net, dev) {
9f9354b9
ED		 1319 in_dev = __in_dev_get_rcu(dev);
1320 if (in_dev) {
1da177e4
LT		 1321 addr = confirm_addr_indev(in_dev, dst, local, scope);
1322 if (addr)
1323 break;
1324 }
1325 }
1326 rcu_read_unlock();
1da177e4
LT		 1327
1328 return addr;
1329}
eaddcd76 1330EXPORT_SYMBOL(inet_confirm_addr);
1da177e4
LT		 1331
1332/*
1333 * Device notifier
1334 */
1335
1336int register_inetaddr_notifier(struct notifier_block *nb)
1337{
e041c683 1338 return blocking_notifier_chain_register(&inetaddr_chain, nb);
1da177e4 1339}
9f9354b9 1340EXPORT_SYMBOL(register_inetaddr_notifier);
1da177e4
LT		 1341
1342int unregister_inetaddr_notifier(struct notifier_block *nb)
1343{
e041c683 1344 return blocking_notifier_chain_unregister(&inetaddr_chain, nb);
1da177e4 1345}
9f9354b9 1346EXPORT_SYMBOL(unregister_inetaddr_notifier);
1da177e4 1347
9f9354b9
ED		 1348/* Rename ifa_labels for a device name change. Make some effort to preserve
1349 * existing alias numbering and to create unique labels if possible.
1da177e4
LT		 1350*/
1351static void inetdev_changename(struct net_device *dev, struct in_device *in_dev)
e905a9ed 1352{
1da177e4
LT		 1353 struct in_ifaddr *ifa;
1354 int named = 0;
1355
e905a9ed
YH		 1356 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1357 char old[IFNAMSIZ], *dot;
1da177e4
LT		 1358
1359 memcpy(old, ifa->ifa_label, IFNAMSIZ);
e905a9ed 1360 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1da177e4 1361 if (named++ == 0)
573bf470 1362 goto skip;
44344b2a 1363 dot = strchr(old, ':');
51456b29 1364 if (!dot) {
e905a9ed 1365 sprintf(old, ":%d", named);
1da177e4
LT		 1366 dot = old;
1367 }
9f9354b9 1368 if (strlen(dot) + strlen(dev->name) < IFNAMSIZ)
e905a9ed 1369 strcat(ifa->ifa_label, dot);
9f9354b9 1370 else
e905a9ed 1371 strcpy(ifa->ifa_label + (IFNAMSIZ - strlen(dot) - 1), dot);
573bf470
TG		 1372skip:
1373 rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0);
e905a9ed
YH		 1374 }
1375}
1da177e4 1376
40384999 1377static bool inetdev_valid_mtu(unsigned int mtu)
06770843
BL		 1378{
1379 return mtu >= 68;
1380}
1381
d11327ad
IC		 1382static void inetdev_send_gratuitous_arp(struct net_device *dev,
1383 struct in_device *in_dev)
1384
1385{
b76d0789 1386 struct in_ifaddr *ifa;
d11327ad 1387
b76d0789
ZK		 1388 for (ifa = in_dev->ifa_list; ifa;
1389 ifa = ifa->ifa_next) {
1390 arp_send(ARPOP_REQUEST, ETH_P_ARP,
1391 ifa->ifa_local, dev,
1392 ifa->ifa_local, NULL,
1393 dev->dev_addr, NULL);
1394 }
d11327ad
IC		 1395}
1396
1da177e4
LT		 1397/* Called only under RTNL semaphore */
1398
1399static int inetdev_event(struct notifier_block *this, unsigned long event,
1400 void *ptr)
1401{
351638e7 1402 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
748e2d93 1403 struct in_device *in_dev = __in_dev_get_rtnl(dev);
0115e8e3 1404
1da177e4
LT		 1405 ASSERT_RTNL();
1406
1407 if (!in_dev) {
8030f544 1408 if (event == NETDEV_REGISTER) {
1da177e4 1409 in_dev = inetdev_init(dev);
20e61da7
WC		 1410 if (IS_ERR(in_dev))
1411 return notifier_from_errno(PTR_ERR(in_dev));
0cc217e1 1412 if (dev->flags & IFF_LOOPBACK) {
42f811b8
HX		 1413 IN_DEV_CONF_SET(in_dev, NOXFRM, 1);
1414 IN_DEV_CONF_SET(in_dev, NOPOLICY, 1);
8030f544 1415 }
06770843
BL		 1416 } else if (event == NETDEV_CHANGEMTU) {
1417 /* Re-enabling IP */
1418 if (inetdev_valid_mtu(dev->mtu))
1419 in_dev = inetdev_init(dev);
1da177e4
LT		 1420 }
1421 goto out;
1422 }
1423
1424 switch (event) {
1425 case NETDEV_REGISTER:
91df42be 1426 pr_debug("%s: bug\n", __func__);
a9b3cd7f 1427 RCU_INIT_POINTER(dev->ip_ptr, NULL);
1da177e4
LT		 1428 break;
1429 case NETDEV_UP:
06770843 1430 if (!inetdev_valid_mtu(dev->mtu))
1da177e4 1431 break;
0cc217e1 1432 if (dev->flags & IFF_LOOPBACK) {
9f9354b9
ED		 1433 struct in_ifaddr *ifa = inet_alloc_ifa();
1434
1435 if (ifa) {
fd23c3b3 1436 INIT_HLIST_NODE(&ifa->hash);
1da177e4
LT		 1437 ifa->ifa_local =
1438 ifa->ifa_address = htonl(INADDR_LOOPBACK);
1439 ifa->ifa_prefixlen = 8;
1440 ifa->ifa_mask = inet_make_mask(8);
1441 in_dev_hold(in_dev);
1442 ifa->ifa_dev = in_dev;
1443 ifa->ifa_scope = RT_SCOPE_HOST;
1444 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
5c766d64
JP		 1445 set_ifa_lifetime(ifa, INFINITY_LIFE_TIME,
1446 INFINITY_LIFE_TIME);
dfd1582d
JP		 1447 ipv4_devconf_setall(in_dev);
1448 neigh_parms_data_state_setall(in_dev->arp_parms);
1da177e4
LT		 1449 inet_insert_ifa(ifa);
1450 }
1451 }
1452 ip_mc_up(in_dev);
eefef1cf
SH		 1453 /* fall through */
1454 case NETDEV_CHANGEADDR:
d11327ad
IC		 1455 if (!IN_DEV_ARP_NOTIFY(in_dev))
1456 break;
1457 /* fall through */
1458 case NETDEV_NOTIFY_PEERS:
a21090cf 1459 /* Send gratuitous ARP to notify of link change */
d11327ad 1460 inetdev_send_gratuitous_arp(dev, in_dev);
1da177e4
LT		 1461 break;
1462 case NETDEV_DOWN:
1463 ip_mc_down(in_dev);
1464 break;
93d9b7d7 1465 case NETDEV_PRE_TYPE_CHANGE:
75c78500
MS		 1466 ip_mc_unmap(in_dev);
1467 break;
93d9b7d7 1468 case NETDEV_POST_TYPE_CHANGE:
75c78500
MS		 1469 ip_mc_remap(in_dev);
1470 break;
1da177e4 1471 case NETDEV_CHANGEMTU:
06770843 1472 if (inetdev_valid_mtu(dev->mtu))
1da177e4 1473 break;
06770843 1474 /* disable IP when MTU is not enough */
1da177e4
LT		 1475 case NETDEV_UNREGISTER:
1476 inetdev_destroy(in_dev);
1477 break;
1478 case NETDEV_CHANGENAME:
1479 /* Do not notify about label change, this event is
1480 * not interesting to applications using netlink.
1481 */
1482 inetdev_changename(dev, in_dev);
1483
51602b2a 1484 devinet_sysctl_unregister(in_dev);
66f27a52 1485 devinet_sysctl_register(in_dev);
1da177e4
LT		 1486 break;
1487 }
1488out:
1489 return NOTIFY_DONE;
1490}
1491
1492static struct notifier_block ip_netdev_notifier = {
539afedf 1493 .notifier_call = inetdev_event,
1da177e4
LT		 1494};
1495
40384999 1496static size_t inet_nlmsg_size(void)
339bf98f
TG		 1497{
1498 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
1499 + nla_total_size(4) /* IFA_ADDRESS */
1500 + nla_total_size(4) /* IFA_LOCAL */
1501 + nla_total_size(4) /* IFA_BROADCAST */
ad6c8135 1502 + nla_total_size(IFNAMSIZ) /* IFA_LABEL */
63b5f152
GU		 1503 + nla_total_size(4) /* IFA_FLAGS */
1504 + nla_total_size(sizeof(struct ifa_cacheinfo)); /* IFA_CACHEINFO */
339bf98f
TG		 1505}
1506
5c766d64
JP		 1507static inline u32 cstamp_delta(unsigned long cstamp)
1508{
1509 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
1510}
1511
1512static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
1513 unsigned long tstamp, u32 preferred, u32 valid)
1514{
1515 struct ifa_cacheinfo ci;
1516
1517 ci.cstamp = cstamp_delta(cstamp);
1518 ci.tstamp = cstamp_delta(tstamp);
1519 ci.ifa_prefered = preferred;
1520 ci.ifa_valid = valid;
1521
1522 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
1523}
1524
1da177e4 1525static int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa,
15e47304 1526 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4
LT		 1527{
1528 struct ifaddrmsg *ifm;
1529 struct nlmsghdr *nlh;
5c766d64 1530 u32 preferred, valid;
1da177e4 1531
15e47304 1532 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*ifm), flags);
51456b29 1533 if (!nlh)
26932566 1534 return -EMSGSIZE;
47f68512
TG		 1535
1536 ifm = nlmsg_data(nlh);
1da177e4
LT		 1537 ifm->ifa_family = AF_INET;
1538 ifm->ifa_prefixlen = ifa->ifa_prefixlen;
5c766d64 1539 ifm->ifa_flags = ifa->ifa_flags;
1da177e4
LT		 1540 ifm->ifa_scope = ifa->ifa_scope;
1541 ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
47f68512 1542
5c766d64
JP		 1543 if (!(ifm->ifa_flags & IFA_F_PERMANENT)) {
1544 preferred = ifa->ifa_preferred_lft;
1545 valid = ifa->ifa_valid_lft;
1546 if (preferred != INFINITY_LIFE_TIME) {
1547 long tval = (jiffies - ifa->ifa_tstamp) / HZ;
1548
1549 if (preferred > tval)
1550 preferred -= tval;
1551 else
1552 preferred = 0;
1553 if (valid != INFINITY_LIFE_TIME) {
1554 if (valid > tval)
1555 valid -= tval;
1556 else
1557 valid = 0;
1558 }
1559 }
1560 } else {
1561 preferred = INFINITY_LIFE_TIME;
1562 valid = INFINITY_LIFE_TIME;
1563 }
f3756b79 1564 if ((ifa->ifa_address &&
930345ea 1565 nla_put_in_addr(skb, IFA_ADDRESS, ifa->ifa_address)) ||
f3756b79 1566 (ifa->ifa_local &&
930345ea 1567 nla_put_in_addr(skb, IFA_LOCAL, ifa->ifa_local)) ||
f3756b79 1568 (ifa->ifa_broadcast &&
930345ea 1569 nla_put_in_addr(skb, IFA_BROADCAST, ifa->ifa_broadcast)) ||
f3756b79 1570 (ifa->ifa_label[0] &&
5c766d64 1571 nla_put_string(skb, IFA_LABEL, ifa->ifa_label)) ||
ad6c8135 1572 nla_put_u32(skb, IFA_FLAGS, ifa->ifa_flags) ||
5c766d64
JP		 1573 put_cacheinfo(skb, ifa->ifa_cstamp, ifa->ifa_tstamp,
1574 preferred, valid))
f3756b79 1575 goto nla_put_failure;
1da177e4 1576
053c095a
JB		 1577 nlmsg_end(skb, nlh);
1578 return 0;
47f68512
TG		 1579
1580nla_put_failure:
26932566
PM		 1581 nlmsg_cancel(skb, nlh);
1582 return -EMSGSIZE;
1da177e4
LT		 1583}
1584
1585static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
1586{
3b1e0a65 1587 struct net *net = sock_net(skb->sk);
eec4df98
ED		 1588 int h, s_h;
1589 int idx, s_idx;
1590 int ip_idx, s_ip_idx;
1da177e4
LT		 1591 struct net_device *dev;
1592 struct in_device *in_dev;
1593 struct in_ifaddr *ifa;
eec4df98 1594 struct hlist_head *head;
1da177e4 1595
eec4df98
ED		 1596 s_h = cb->args[0];
1597 s_idx = idx = cb->args[1];
1598 s_ip_idx = ip_idx = cb->args[2];
1599
1600 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1601 idx = 0;
1602 head = &net->dev_index_head[h];
1603 rcu_read_lock();
0465277f
ND		 1604 cb->seq = atomic_read(&net->ipv4.dev_addr_genid) ^
1605 net->dev_base_seq;
b67bfe0d 1606 hlist_for_each_entry_rcu(dev, head, index_hlist) {
eec4df98
ED		 1607 if (idx < s_idx)
1608 goto cont;
4b97efdf 1609 if (h > s_h || idx > s_idx)
eec4df98
ED		 1610 s_ip_idx = 0;
1611 in_dev = __in_dev_get_rcu(dev);
1612 if (!in_dev)
1613 goto cont;
1da177e4 1614
eec4df98
ED		 1615 for (ifa = in_dev->ifa_list, ip_idx = 0; ifa;
1616 ifa = ifa->ifa_next, ip_idx++) {
1617 if (ip_idx < s_ip_idx)
1618 continue;
1619 if (inet_fill_ifaddr(skb, ifa,
15e47304 1620 NETLINK_CB(cb->skb).portid,
1da177e4 1621 cb->nlh->nlmsg_seq,
053c095a 1622 RTM_NEWADDR, NLM_F_MULTI) < 0) {
eec4df98
ED		 1623 rcu_read_unlock();
1624 goto done;
1625 }
0465277f 1626 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
eec4df98 1627 }
7562f876 1628cont:
eec4df98
ED		 1629 idx++;
1630 }
1631 rcu_read_unlock();
1da177e4
LT		 1632 }
1633
1634done:
eec4df98
ED		 1635 cb->args[0] = h;
1636 cb->args[1] = idx;
1637 cb->args[2] = ip_idx;
1da177e4
LT		 1638
1639 return skb->len;
1640}
1641
539afedf 1642static void rtmsg_ifa(int event, struct in_ifaddr *ifa, struct nlmsghdr *nlh,
15e47304 1643 u32 portid)
1da177e4 1644{
47f68512 1645 struct sk_buff *skb;
d6062cbb
TG		 1646 u32 seq = nlh ? nlh->nlmsg_seq : 0;
1647 int err = -ENOBUFS;
4b8aa9ab 1648 struct net *net;
1da177e4 1649
c346dca1 1650 net = dev_net(ifa->ifa_dev->dev);
339bf98f 1651 skb = nlmsg_new(inet_nlmsg_size(), GFP_KERNEL);
51456b29 1652 if (!skb)
d6062cbb
TG		 1653 goto errout;
1654
15e47304 1655 err = inet_fill_ifaddr(skb, ifa, portid, seq, event, 0);
26932566
PM		 1656 if (err < 0) {
1657 /* -EMSGSIZE implies BUG in inet_nlmsg_size() */
1658 WARN_ON(err == -EMSGSIZE);
1659 kfree_skb(skb);
1660 goto errout;
1661 }
15e47304 1662 rtnl_notify(skb, net, portid, RTNLGRP_IPV4_IFADDR, nlh, GFP_KERNEL);
1ce85fe4 1663 return;
d6062cbb
TG		 1664errout:
1665 if (err < 0)
4b8aa9ab 1666 rtnl_set_sk_err(net, RTNLGRP_IPV4_IFADDR, err);
1da177e4
LT		 1667}
1668
b1974ed0
AR		 1669static size_t inet_get_link_af_size(const struct net_device *dev,
1670 u32 ext_filter_mask)
9f0f7272 1671{
1fc19aff 1672 struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr);
9f0f7272
TG		 1673
1674 if (!in_dev)
1675 return 0;
1676
1677 return nla_total_size(IPV4_DEVCONF_MAX * 4); /* IFLA_INET_CONF */
1678}
1679
d5566fd7
SV		 1680static int inet_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
1681 u32 ext_filter_mask)
9f0f7272 1682{
1fc19aff 1683 struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr);
9f0f7272
TG		 1684 struct nlattr *nla;
1685 int i;
1686
1687 if (!in_dev)
1688 return -ENODATA;
1689
1690 nla = nla_reserve(skb, IFLA_INET_CONF, IPV4_DEVCONF_MAX * 4);
51456b29 1691 if (!nla)
9f0f7272
TG		 1692 return -EMSGSIZE;
1693
1694 for (i = 0; i < IPV4_DEVCONF_MAX; i++)
1695 ((u32 *) nla_data(nla))[i] = in_dev->cnf.data[i];
1696
1697 return 0;
1698}
1699
1700static const struct nla_policy inet_af_policy[IFLA_INET_MAX+1] = {
1701 [IFLA_INET_CONF] = { .type = NLA_NESTED },
1702};
1703
cf7afbfe
TG		 1704static int inet_validate_link_af(const struct net_device *dev,
1705 const struct nlattr *nla)
9f0f7272 1706{
9f0f7272
TG		 1707 struct nlattr *a, *tb[IFLA_INET_MAX+1];
1708 int err, rem;
1709
f7fce74e 1710 if (dev && !__in_dev_get_rtnl(dev))
cf7afbfe 1711 return -EAFNOSUPPORT;
9f0f7272
TG		 1712
1713 err = nla_parse_nested(tb, IFLA_INET_MAX, nla, inet_af_policy);
1714 if (err < 0)
1715 return err;
1716
1717 if (tb[IFLA_INET_CONF]) {
1718 nla_for_each_nested(a, tb[IFLA_INET_CONF], rem) {
1719 int cfgid = nla_type(a);
1720
1721 if (nla_len(a) < 4)
1722 return -EINVAL;
1723
1724 if (cfgid <= 0 || cfgid > IPV4_DEVCONF_MAX)
1725 return -EINVAL;
1726 }
1727 }
1728
cf7afbfe
TG		 1729 return 0;
1730}
1731
1732static int inet_set_link_af(struct net_device *dev, const struct nlattr *nla)
1733{
f7fce74e 1734 struct in_device *in_dev = __in_dev_get_rtnl(dev);
cf7afbfe
TG		 1735 struct nlattr *a, *tb[IFLA_INET_MAX+1];
1736 int rem;
1737
1738 if (!in_dev)
1739 return -EAFNOSUPPORT;
1740
1741 if (nla_parse_nested(tb, IFLA_INET_MAX, nla, NULL) < 0)
1742 BUG();
1743
9f0f7272
TG		 1744 if (tb[IFLA_INET_CONF]) {
1745 nla_for_each_nested(a, tb[IFLA_INET_CONF], rem)
1746 ipv4_devconf_set(in_dev, nla_type(a), nla_get_u32(a));
1747 }
1748
1749 return 0;
1750}
1751
edc9e748
ND		 1752static int inet_netconf_msgsize_devconf(int type)
1753{
1754 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
1755 + nla_total_size(4); /* NETCONFA_IFINDEX */
136ba622 1756 bool all = false;
edc9e748 1757
136ba622
ZS		 1758 if (type == NETCONFA_ALL)
1759 all = true;
1760
1761 if (all || type == NETCONFA_FORWARDING)
edc9e748 1762 size += nla_total_size(4);
136ba622 1763 if (all || type == NETCONFA_RP_FILTER)
cc535dfb 1764 size += nla_total_size(4);
136ba622 1765 if (all || type == NETCONFA_MC_FORWARDING)
d67b8c61 1766 size += nla_total_size(4);
136ba622 1767 if (all || type == NETCONFA_PROXY_NEIGH)
f085ff1c 1768 size += nla_total_size(4);
136ba622 1769 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
974d7af5 1770 size += nla_total_size(4);
edc9e748
ND		 1771
1772 return size;
1773}
1774
1775static int inet_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
1776 struct ipv4_devconf *devconf, u32 portid,
1777 u32 seq, int event, unsigned int flags,
1778 int type)
1779{
1780 struct nlmsghdr *nlh;
1781 struct netconfmsg *ncm;
136ba622 1782 bool all = false;
edc9e748
ND		 1783
1784 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
1785 flags);
51456b29 1786 if (!nlh)
edc9e748
ND		 1787 return -EMSGSIZE;
1788
136ba622
ZS		 1789 if (type == NETCONFA_ALL)
1790 all = true;
1791
edc9e748
ND		 1792 ncm = nlmsg_data(nlh);
1793 ncm->ncm_family = AF_INET;
1794
1795 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
1796 goto nla_put_failure;
1797
136ba622 1798 if ((all || type == NETCONFA_FORWARDING) &&
edc9e748
ND		 1799 nla_put_s32(skb, NETCONFA_FORWARDING,
1800 IPV4_DEVCONF(*devconf, FORWARDING)) < 0)
1801 goto nla_put_failure;
136ba622 1802 if ((all || type == NETCONFA_RP_FILTER) &&
cc535dfb
ND		 1803 nla_put_s32(skb, NETCONFA_RP_FILTER,
1804 IPV4_DEVCONF(*devconf, RP_FILTER)) < 0)
1805 goto nla_put_failure;
136ba622 1806 if ((all || type == NETCONFA_MC_FORWARDING) &&
d67b8c61
ND		 1807 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
1808 IPV4_DEVCONF(*devconf, MC_FORWARDING)) < 0)
1809 goto nla_put_failure;
136ba622 1810 if ((all || type == NETCONFA_PROXY_NEIGH) &&
09aea5df 1811 nla_put_s32(skb, NETCONFA_PROXY_NEIGH,
f085ff1c 1812 IPV4_DEVCONF(*devconf, PROXY_ARP)) < 0)
1813 goto nla_put_failure;
136ba622 1814 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
974d7af5
AG		 1815 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
1816 IPV4_DEVCONF(*devconf, IGNORE_ROUTES_WITH_LINKDOWN)) < 0)
1817 goto nla_put_failure;
edc9e748 1818
053c095a
JB		 1819 nlmsg_end(skb, nlh);
1820 return 0;
edc9e748
ND		 1821
1822nla_put_failure:
1823 nlmsg_cancel(skb, nlh);
1824 return -EMSGSIZE;
1825}
1826
d67b8c61
ND		 1827void inet_netconf_notify_devconf(struct net *net, int type, int ifindex,
1828 struct ipv4_devconf *devconf)
edc9e748
ND		 1829{
1830 struct sk_buff *skb;
1831 int err = -ENOBUFS;
1832
1833 skb = nlmsg_new(inet_netconf_msgsize_devconf(type), GFP_ATOMIC);
51456b29 1834 if (!skb)
edc9e748
ND		 1835 goto errout;
1836
1837 err = inet_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
1838 RTM_NEWNETCONF, 0, type);
1839 if (err < 0) {
1840 /* -EMSGSIZE implies BUG in inet_netconf_msgsize_devconf() */
1841 WARN_ON(err == -EMSGSIZE);
1842 kfree_skb(skb);
1843 goto errout;
1844 }
1845 rtnl_notify(skb, net, 0, RTNLGRP_IPV4_NETCONF, NULL, GFP_ATOMIC);
1846 return;
1847errout:
1848 if (err < 0)
1849 rtnl_set_sk_err(net, RTNLGRP_IPV4_NETCONF, err);
1850}
1851
9e551110
ND		 1852static const struct nla_policy devconf_ipv4_policy[NETCONFA_MAX+1] = {
1853 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
1854 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
cc535dfb 1855 [NETCONFA_RP_FILTER] = { .len = sizeof(int) },
09aea5df 1856 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
974d7af5 1857 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
9e551110
ND		 1858};
1859
1860static int inet_netconf_get_devconf(struct sk_buff *in_skb,
661d2967 1861 struct nlmsghdr *nlh)
9e551110
ND		 1862{
1863 struct net *net = sock_net(in_skb->sk);
1864 struct nlattr *tb[NETCONFA_MAX+1];
1865 struct netconfmsg *ncm;
1866 struct sk_buff *skb;
1867 struct ipv4_devconf *devconf;
1868 struct in_device *in_dev;
1869 struct net_device *dev;
1870 int ifindex;
1871 int err;
1872
1873 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
1874 devconf_ipv4_policy);
1875 if (err < 0)
1876 goto errout;
1877
a97eb33f 1878 err = -EINVAL;
9e551110
ND		 1879 if (!tb[NETCONFA_IFINDEX])
1880 goto errout;
1881
1882 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
1883 switch (ifindex) {
1884 case NETCONFA_IFINDEX_ALL:
1885 devconf = net->ipv4.devconf_all;
1886 break;
1887 case NETCONFA_IFINDEX_DEFAULT:
1888 devconf = net->ipv4.devconf_dflt;
1889 break;
1890 default:
1891 dev = __dev_get_by_index(net, ifindex);
51456b29 1892 if (!dev)
9e551110
ND		 1893 goto errout;
1894 in_dev = __in_dev_get_rtnl(dev);
51456b29 1895 if (!in_dev)
9e551110
ND		 1896 goto errout;
1897 devconf = &in_dev->cnf;
1898 break;
1899 }
1900
1901 err = -ENOBUFS;
136ba622 1902 skb = nlmsg_new(inet_netconf_msgsize_devconf(NETCONFA_ALL), GFP_ATOMIC);
51456b29 1903 if (!skb)
9e551110
ND		 1904 goto errout;
1905
1906 err = inet_netconf_fill_devconf(skb, ifindex, devconf,
1907 NETLINK_CB(in_skb).portid,
1908 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
136ba622 1909 NETCONFA_ALL);
9e551110
ND		 1910 if (err < 0) {
1911 /* -EMSGSIZE implies BUG in inet_netconf_msgsize_devconf() */
1912 WARN_ON(err == -EMSGSIZE);
1913 kfree_skb(skb);
1914 goto errout;
1915 }
1916 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
1917errout:
1918 return err;
1919}
1920
7a674200
ND		 1921static int inet_netconf_dump_devconf(struct sk_buff *skb,
1922 struct netlink_callback *cb)
1923{
1924 struct net *net = sock_net(skb->sk);
1925 int h, s_h;
1926 int idx, s_idx;
1927 struct net_device *dev;
1928 struct in_device *in_dev;
1929 struct hlist_head *head;
1930
1931 s_h = cb->args[0];
1932 s_idx = idx = cb->args[1];
1933
1934 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1935 idx = 0;
1936 head = &net->dev_index_head[h];
1937 rcu_read_lock();
0465277f
ND		 1938 cb->seq = atomic_read(&net->ipv4.dev_addr_genid) ^
1939 net->dev_base_seq;
7a674200
ND		 1940 hlist_for_each_entry_rcu(dev, head, index_hlist) {
1941 if (idx < s_idx)
1942 goto cont;
1943 in_dev = __in_dev_get_rcu(dev);
1944 if (!in_dev)
1945 goto cont;
1946
1947 if (inet_netconf_fill_devconf(skb, dev->ifindex,
1948 &in_dev->cnf,
1949 NETLINK_CB(cb->skb).portid,
1950 cb->nlh->nlmsg_seq,
1951 RTM_NEWNETCONF,
1952 NLM_F_MULTI,
136ba622 1953 NETCONFA_ALL) < 0) {
7a674200
ND		 1954 rcu_read_unlock();
1955 goto done;
1956 }
0465277f 1957 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7a674200
ND		 1958cont:
1959 idx++;
1960 }
1961 rcu_read_unlock();
1962 }
1963 if (h == NETDEV_HASHENTRIES) {
1964 if (inet_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
1965 net->ipv4.devconf_all,
1966 NETLINK_CB(cb->skb).portid,
1967 cb->nlh->nlmsg_seq,
1968 RTM_NEWNETCONF, NLM_F_MULTI,
136ba622 1969 NETCONFA_ALL) < 0)
7a674200
ND		 1970 goto done;
1971 else
1972 h++;
1973 }
1974 if (h == NETDEV_HASHENTRIES + 1) {
1975 if (inet_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
1976 net->ipv4.devconf_dflt,
1977 NETLINK_CB(cb->skb).portid,
1978 cb->nlh->nlmsg_seq,
1979 RTM_NEWNETCONF, NLM_F_MULTI,
136ba622 1980 NETCONFA_ALL) < 0)
7a674200
ND		 1981 goto done;
1982 else
1983 h++;
1984 }
1985done:
1986 cb->args[0] = h;
1987 cb->args[1] = idx;
1988
1989 return skb->len;
1990}
1991
1da177e4
LT		 1992#ifdef CONFIG_SYSCTL
1993
c0ce9fb3 1994static void devinet_copy_dflt_conf(struct net *net, int i)
31be3085
HX		 1995{
1996 struct net_device *dev;
1997
c6d14c84
ED		 1998 rcu_read_lock();
1999 for_each_netdev_rcu(net, dev) {
31be3085 2000 struct in_device *in_dev;
c6d14c84 2001
31be3085
HX		 2002 in_dev = __in_dev_get_rcu(dev);
2003 if (in_dev && !test_bit(i, in_dev->cnf.state))
9355bbd6 2004 in_dev->cnf.data[i] = net->ipv4.devconf_dflt->data[i];
31be3085 2005 }
c6d14c84 2006 rcu_read_unlock();
31be3085
HX		 2007}
2008
c6d14c84 2009/* called with RTNL locked */
c0ce9fb3 2010static void inet_forward_change(struct net *net)
68dd299b
PE		 2011{
2012 struct net_device *dev;
586f1211 2013 int on = IPV4_DEVCONF_ALL(net, FORWARDING);
68dd299b 2014
586f1211 2015 IPV4_DEVCONF_ALL(net, ACCEPT_REDIRECTS) = !on;
9355bbd6 2016 IPV4_DEVCONF_DFLT(net, FORWARDING) = on;
edc9e748
ND		 2017 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING,
2018 NETCONFA_IFINDEX_ALL,
2019 net->ipv4.devconf_all);
2020 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING,
2021 NETCONFA_IFINDEX_DEFAULT,
2022 net->ipv4.devconf_dflt);
68dd299b 2023
c0ce9fb3 2024 for_each_netdev(net, dev) {
68dd299b 2025 struct in_device *in_dev;
0187bdfb
BH		 2026 if (on)
2027 dev_disable_lro(dev);
68dd299b
PE		 2028 rcu_read_lock();
2029 in_dev = __in_dev_get_rcu(dev);
edc9e748 2030 if (in_dev) {
68dd299b 2031 IN_DEV_CONF_SET(in_dev, FORWARDING, on);
edc9e748
ND		 2032 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING,
2033 dev->ifindex, &in_dev->cnf);
2034 }
68dd299b
PE		 2035 rcu_read_unlock();
2036 }
68dd299b
PE		 2037}
2038
f085ff1c 2039static int devinet_conf_ifindex(struct net *net, struct ipv4_devconf *cnf)
2040{
2041 if (cnf == net->ipv4.devconf_dflt)
2042 return NETCONFA_IFINDEX_DEFAULT;
2043 else if (cnf == net->ipv4.devconf_all)
2044 return NETCONFA_IFINDEX_ALL;
2045 else {
2046 struct in_device *idev
2047 = container_of(cnf, struct in_device, cnf);
2048 return idev->dev->ifindex;
2049 }
2050}
2051
fe2c6338 2052static int devinet_conf_proc(struct ctl_table *ctl, int write,
8d65af78 2053 void __user *buffer,
31be3085
HX		 2054 size_t *lenp, loff_t *ppos)
2055{
d01ff0a0 2056 int old_value = *(int *)ctl->data;
8d65af78 2057 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
d01ff0a0 2058 int new_value = *(int *)ctl->data;
31be3085
HX		 2059
2060 if (write) {
2061 struct ipv4_devconf *cnf = ctl->extra1;
c0ce9fb3 2062 struct net *net = ctl->extra2;
31be3085 2063 int i = (int *)ctl->data - cnf->data;
f085ff1c 2064 int ifindex;
31be3085
HX		 2065
2066 set_bit(i, cnf->state);
2067
9355bbd6 2068 if (cnf == net->ipv4.devconf_dflt)
c0ce9fb3 2069 devinet_copy_dflt_conf(net, i);
d0daebc3
TG		 2070 if (i == IPV4_DEVCONF_ACCEPT_LOCAL - 1 ||
2071 i == IPV4_DEVCONF_ROUTE_LOCALNET - 1)
d01ff0a0 2072 if ((new_value == 0) && (old_value != 0))
4ccfe6d4 2073 rt_cache_flush(net);
f085ff1c 2074
cc535dfb
ND		 2075 if (i == IPV4_DEVCONF_RP_FILTER - 1 &&
2076 new_value != old_value) {
f085ff1c 2077 ifindex = devinet_conf_ifindex(net, cnf);
cc535dfb
ND		 2078 inet_netconf_notify_devconf(net, NETCONFA_RP_FILTER,
2079 ifindex, cnf);
2080 }
f085ff1c 2081 if (i == IPV4_DEVCONF_PROXY_ARP - 1 &&
2082 new_value != old_value) {
2083 ifindex = devinet_conf_ifindex(net, cnf);
09aea5df 2084 inet_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
f085ff1c 2085 ifindex, cnf);
2086 }
974d7af5
AG		 2087 if (i == IPV4_DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN - 1 &&
2088 new_value != old_value) {
2089 ifindex = devinet_conf_ifindex(net, cnf);
2090 inet_netconf_notify_devconf(net, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
2091 ifindex, cnf);
2092 }
31be3085
HX		 2093 }
2094
2095 return ret;
2096}
2097
fe2c6338 2098static int devinet_sysctl_forward(struct ctl_table *ctl, int write,
8d65af78 2099 void __user *buffer,
1da177e4
LT		 2100 size_t *lenp, loff_t *ppos)
2101{
2102 int *valp = ctl->data;
2103 int val = *valp;
88af182e 2104 loff_t pos = *ppos;
8d65af78 2105 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
1da177e4
LT		 2106
2107 if (write && *valp != val) {
c0ce9fb3
PE		 2108 struct net *net = ctl->extra2;
2109
0187bdfb 2110 if (valp != &IPV4_DEVCONF_DFLT(net, FORWARDING)) {
88af182e
EB		 2111 if (!rtnl_trylock()) {
2112 /* Restore the original values before restarting */
2113 *valp = val;
2114 *ppos = pos;
9b8adb5e 2115 return restart_syscall();
88af182e 2116 }
0187bdfb
BH		 2117 if (valp == &IPV4_DEVCONF_ALL(net, FORWARDING)) {
2118 inet_forward_change(net);
edc9e748 2119 } else {
0187bdfb
BH		 2120 struct ipv4_devconf *cnf = ctl->extra1;
2121 struct in_device *idev =
2122 container_of(cnf, struct in_device, cnf);
edc9e748
ND		 2123 if (*valp)
2124 dev_disable_lro(idev->dev);
2125 inet_netconf_notify_devconf(net,
2126 NETCONFA_FORWARDING,
2127 idev->dev->ifindex,
2128 cnf);
0187bdfb
BH		 2129 }
2130 rtnl_unlock();
4ccfe6d4 2131 rt_cache_flush(net);
edc9e748
ND		 2132 } else
2133 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING,
2134 NETCONFA_IFINDEX_DEFAULT,
2135 net->ipv4.devconf_dflt);
1da177e4
LT		 2136 }
2137
2138 return ret;
2139}
2140
fe2c6338 2141static int ipv4_doint_and_flush(struct ctl_table *ctl, int write,
323e126f
DM		 2142 void __user *buffer,
2143 size_t *lenp, loff_t *ppos)
1da177e4
LT		 2144{
2145 int *valp = ctl->data;
2146 int val = *valp;
8d65af78 2147 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
76e6ebfb 2148 struct net *net = ctl->extra2;
1da177e4
LT		 2149
2150 if (write && *valp != val)
4ccfe6d4 2151 rt_cache_flush(net);
1da177e4
LT		 2152
2153 return ret;
2154}
2155
f8572d8f 2156#define DEVINET_SYSCTL_ENTRY(attr, name, mval, proc) \
42f811b8 2157 { \
42f811b8
HX		 2158 .procname = name, \
2159 .data = ipv4_devconf.data + \
02291680 2160 IPV4_DEVCONF_ ## attr - 1, \
42f811b8
HX		 2161 .maxlen = sizeof(int), \
2162 .mode = mval, \
2163 .proc_handler = proc, \
31be3085 2164 .extra1 = &ipv4_devconf, \
42f811b8
HX		 2165 }
2166
2167#define DEVINET_SYSCTL_RW_ENTRY(attr, name) \
f8572d8f 2168 DEVINET_SYSCTL_ENTRY(attr, name, 0644, devinet_conf_proc)
42f811b8
HX		 2169
2170#define DEVINET_SYSCTL_RO_ENTRY(attr, name) \
f8572d8f 2171 DEVINET_SYSCTL_ENTRY(attr, name, 0444, devinet_conf_proc)
42f811b8 2172
f8572d8f
EB		 2173#define DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, proc) \
2174 DEVINET_SYSCTL_ENTRY(attr, name, 0644, proc)
42f811b8
HX		 2175
2176#define DEVINET_SYSCTL_FLUSHING_ENTRY(attr, name) \
f8572d8f 2177 DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, ipv4_doint_and_flush)
42f811b8 2178
1da177e4
LT		 2179static struct devinet_sysctl_table {
2180 struct ctl_table_header *sysctl_header;
02291680 2181 struct ctl_table devinet_vars[__IPV4_DEVCONF_MAX];
1da177e4
LT		 2182} devinet_sysctl = {
2183 .devinet_vars = {
42f811b8 2184 DEVINET_SYSCTL_COMPLEX_ENTRY(FORWARDING, "forwarding",
f8572d8f 2185 devinet_sysctl_forward),
42f811b8
HX		 2186 DEVINET_SYSCTL_RO_ENTRY(MC_FORWARDING, "mc_forwarding"),
2187
2188 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_REDIRECTS, "accept_redirects"),
2189 DEVINET_SYSCTL_RW_ENTRY(SECURE_REDIRECTS, "secure_redirects"),
2190 DEVINET_SYSCTL_RW_ENTRY(SHARED_MEDIA, "shared_media"),
2191 DEVINET_SYSCTL_RW_ENTRY(RP_FILTER, "rp_filter"),
2192 DEVINET_SYSCTL_RW_ENTRY(SEND_REDIRECTS, "send_redirects"),
2193 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_SOURCE_ROUTE,
2194 "accept_source_route"),
8153a10c 2195 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_LOCAL, "accept_local"),
28f6aeea 2196 DEVINET_SYSCTL_RW_ENTRY(SRC_VMARK, "src_valid_mark"),
42f811b8
HX		 2197 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP, "proxy_arp"),
2198 DEVINET_SYSCTL_RW_ENTRY(MEDIUM_ID, "medium_id"),
2199 DEVINET_SYSCTL_RW_ENTRY(BOOTP_RELAY, "bootp_relay"),
2200 DEVINET_SYSCTL_RW_ENTRY(LOG_MARTIANS, "log_martians"),
2201 DEVINET_SYSCTL_RW_ENTRY(TAG, "tag"),
2202 DEVINET_SYSCTL_RW_ENTRY(ARPFILTER, "arp_filter"),
2203 DEVINET_SYSCTL_RW_ENTRY(ARP_ANNOUNCE, "arp_announce"),
2204 DEVINET_SYSCTL_RW_ENTRY(ARP_IGNORE, "arp_ignore"),
2205 DEVINET_SYSCTL_RW_ENTRY(ARP_ACCEPT, "arp_accept"),
eefef1cf 2206 DEVINET_SYSCTL_RW_ENTRY(ARP_NOTIFY, "arp_notify"),
65324144 2207 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP_PVLAN, "proxy_arp_pvlan"),
5c6fe01c
WM		 2208 DEVINET_SYSCTL_RW_ENTRY(FORCE_IGMP_VERSION,
2209 "force_igmp_version"),
2690048c
WM		 2210 DEVINET_SYSCTL_RW_ENTRY(IGMPV2_UNSOLICITED_REPORT_INTERVAL,
2211 "igmpv2_unsolicited_report_interval"),
2212 DEVINET_SYSCTL_RW_ENTRY(IGMPV3_UNSOLICITED_REPORT_INTERVAL,
2213 "igmpv3_unsolicited_report_interval"),
0eeb075f
AG		 2214 DEVINET_SYSCTL_RW_ENTRY(IGNORE_ROUTES_WITH_LINKDOWN,
2215 "ignore_routes_with_linkdown"),
97daf331
JB		 2216 DEVINET_SYSCTL_RW_ENTRY(DROP_GRATUITOUS_ARP,
2217 "drop_gratuitous_arp"),
42f811b8
HX		 2218
2219 DEVINET_SYSCTL_FLUSHING_ENTRY(NOXFRM, "disable_xfrm"),
2220 DEVINET_SYSCTL_FLUSHING_ENTRY(NOPOLICY, "disable_policy"),
42f811b8
HX		 2221 DEVINET_SYSCTL_FLUSHING_ENTRY(PROMOTE_SECONDARIES,
2222 "promote_secondaries"),
d0daebc3
TG		 2223 DEVINET_SYSCTL_FLUSHING_ENTRY(ROUTE_LOCALNET,
2224 "route_localnet"),
12b74dfa
JB		 2225 DEVINET_SYSCTL_FLUSHING_ENTRY(DROP_UNICAST_IN_L2_MULTICAST,
2226 "drop_unicast_in_l2_multicast"),
1da177e4 2227 },
1da177e4
LT		 2228};
2229
ea40b324 2230static int __devinet_sysctl_register(struct net *net, char *dev_name,
f8572d8f 2231 struct ipv4_devconf *p)
1da177e4
LT		 2232{
2233 int i;
9fa89642 2234 struct devinet_sysctl_table *t;
8607ddb8 2235 char path[sizeof("net/ipv4/conf/") + IFNAMSIZ];
bfada697 2236
9fa89642 2237 t = kmemdup(&devinet_sysctl, sizeof(*t), GFP_KERNEL);
1da177e4 2238 if (!t)
9fa89642
PE		 2239 goto out;
2240
1da177e4
LT		 2241 for (i = 0; i < ARRAY_SIZE(t->devinet_vars) - 1; i++) {
2242 t->devinet_vars[i].data += (char *)p - (char *)&ipv4_devconf;
31be3085 2243 t->devinet_vars[i].extra1 = p;
c0ce9fb3 2244 t->devinet_vars[i].extra2 = net;
1da177e4
LT		 2245 }
2246
8607ddb8 2247 snprintf(path, sizeof(path), "net/ipv4/conf/%s", dev_name);
1da177e4 2248
8607ddb8 2249 t->sysctl_header = register_net_sysctl(net, path, t->devinet_vars);
1da177e4 2250 if (!t->sysctl_header)
8607ddb8 2251 goto free;
1da177e4
LT		 2252
2253 p->sysctl = t;
ea40b324 2254 return 0;
1da177e4 2255
9fa89642 2256free:
1da177e4 2257 kfree(t);
9fa89642 2258out:
ea40b324 2259 return -ENOBUFS;
1da177e4
LT		 2260}
2261
51602b2a
PE		 2262static void __devinet_sysctl_unregister(struct ipv4_devconf *cnf)
2263{
2264 struct devinet_sysctl_table *t = cnf->sysctl;
2265
51456b29 2266 if (!t)
51602b2a
PE		 2267 return;
2268
2269 cnf->sysctl = NULL;
ff538818 2270 unregister_net_sysctl_table(t->sysctl_header);
51602b2a
PE		 2271 kfree(t);
2272}
2273
20e61da7 2274static int devinet_sysctl_register(struct in_device *idev)
66f27a52 2275{
20e61da7
WC		 2276 int err;
2277
2278 if (!sysctl_dev_name_is_allowed(idev->dev->name))
2279 return -EINVAL;
2280
2281 err = neigh_sysctl_register(idev->dev, idev->arp_parms, NULL);
2282 if (err)
2283 return err;
2284 err = __devinet_sysctl_register(dev_net(idev->dev), idev->dev->name,
f8572d8f 2285 &idev->cnf);
20e61da7
WC		 2286 if (err)
2287 neigh_sysctl_unregister(idev->arp_parms);
2288 return err;
66f27a52
PE		 2289}
2290
51602b2a 2291static void devinet_sysctl_unregister(struct in_device *idev)
1da177e4 2292{
51602b2a
PE		 2293 __devinet_sysctl_unregister(&idev->cnf);
2294 neigh_sysctl_unregister(idev->arp_parms);
1da177e4 2295}
1da177e4 2296
68dd299b
PE		 2297static struct ctl_table ctl_forward_entry[] = {
2298 {
68dd299b
PE		 2299 .procname = "ip_forward",
2300 .data = &ipv4_devconf.data[
02291680 2301 IPV4_DEVCONF_FORWARDING - 1],
68dd299b
PE		 2302 .maxlen = sizeof(int),
2303 .mode = 0644,
2304 .proc_handler = devinet_sysctl_forward,
68dd299b 2305 .extra1 = &ipv4_devconf,
c0ce9fb3 2306 .extra2 = &init_net,
68dd299b
PE		 2307 },
2308 { },
2309};
2a75de0c 2310#endif
68dd299b 2311
752d14dc
PE		 2312static __net_init int devinet_init_net(struct net *net)
2313{
2314 int err;
752d14dc 2315 struct ipv4_devconf *all, *dflt;
2a75de0c
ED		 2316#ifdef CONFIG_SYSCTL
2317 struct ctl_table *tbl = ctl_forward_entry;
752d14dc 2318 struct ctl_table_header *forw_hdr;
2a75de0c 2319#endif
752d14dc
PE		 2320
2321 err = -ENOMEM;
2322 all = &ipv4_devconf;
2323 dflt = &ipv4_devconf_dflt;
752d14dc 2324
09ad9bc7 2325 if (!net_eq(net, &init_net)) {
752d14dc 2326 all = kmemdup(all, sizeof(ipv4_devconf), GFP_KERNEL);
51456b29 2327 if (!all)
752d14dc
PE		 2328 goto err_alloc_all;
2329
2330 dflt = kmemdup(dflt, sizeof(ipv4_devconf_dflt), GFP_KERNEL);
51456b29 2331 if (!dflt)
752d14dc
PE		 2332 goto err_alloc_dflt;
2333
2a75de0c 2334#ifdef CONFIG_SYSCTL
752d14dc 2335 tbl = kmemdup(tbl, sizeof(ctl_forward_entry), GFP_KERNEL);
51456b29 2336 if (!tbl)
752d14dc
PE		 2337 goto err_alloc_ctl;
2338
02291680 2339 tbl[0].data = &all->data[IPV4_DEVCONF_FORWARDING - 1];
752d14dc
PE		 2340 tbl[0].extra1 = all;
2341 tbl[0].extra2 = net;
2a75de0c 2342#endif
752d14dc
PE		 2343 }
2344
2345#ifdef CONFIG_SYSCTL
f8572d8f 2346 err = __devinet_sysctl_register(net, "all", all);
752d14dc
PE		 2347 if (err < 0)
2348 goto err_reg_all;
2349
f8572d8f 2350 err = __devinet_sysctl_register(net, "default", dflt);
752d14dc
PE		 2351 if (err < 0)
2352 goto err_reg_dflt;
2353
2354 err = -ENOMEM;
8607ddb8 2355 forw_hdr = register_net_sysctl(net, "net/ipv4", tbl);
51456b29 2356 if (!forw_hdr)
752d14dc 2357 goto err_reg_ctl;
2a75de0c 2358 net->ipv4.forw_hdr = forw_hdr;
752d14dc
PE		 2359#endif
2360
752d14dc
PE		 2361 net->ipv4.devconf_all = all;
2362 net->ipv4.devconf_dflt = dflt;
2363 return 0;
2364
2365#ifdef CONFIG_SYSCTL
2366err_reg_ctl:
2367 __devinet_sysctl_unregister(dflt);
2368err_reg_dflt:
2369 __devinet_sysctl_unregister(all);
2370err_reg_all:
2371 if (tbl != ctl_forward_entry)
2372 kfree(tbl);
752d14dc 2373err_alloc_ctl:
2a75de0c 2374#endif
752d14dc
PE		 2375 if (dflt != &ipv4_devconf_dflt)
2376 kfree(dflt);
2377err_alloc_dflt:
2378 if (all != &ipv4_devconf)
2379 kfree(all);
2380err_alloc_all:
2381 return err;
2382}
2383
2384static __net_exit void devinet_exit_net(struct net *net)
2385{
2a75de0c 2386#ifdef CONFIG_SYSCTL
752d14dc
PE		 2387 struct ctl_table *tbl;
2388
2389 tbl = net->ipv4.forw_hdr->ctl_table_arg;
752d14dc
PE		 2390 unregister_net_sysctl_table(net->ipv4.forw_hdr);
2391 __devinet_sysctl_unregister(net->ipv4.devconf_dflt);
2392 __devinet_sysctl_unregister(net->ipv4.devconf_all);
752d14dc 2393 kfree(tbl);
2a75de0c 2394#endif
752d14dc
PE		 2395 kfree(net->ipv4.devconf_dflt);
2396 kfree(net->ipv4.devconf_all);
2397}
2398
2399static __net_initdata struct pernet_operations devinet_ops = {
2400 .init = devinet_init_net,
2401 .exit = devinet_exit_net,
2402};
2403
207895fd 2404static struct rtnl_af_ops inet_af_ops __read_mostly = {
9f0f7272
TG		 2405 .family = AF_INET,
2406 .fill_link_af = inet_fill_link_af,
2407 .get_link_af_size = inet_get_link_af_size,
cf7afbfe
TG		 2408 .validate_link_af = inet_validate_link_af,
2409 .set_link_af = inet_set_link_af,
9f0f7272
TG		 2410};
2411
1da177e4
LT		 2412void __init devinet_init(void)
2413{
fd23c3b3
DM		 2414 int i;
2415
2416 for (i = 0; i < IN4_ADDR_HSIZE; i++)
2417 INIT_HLIST_HEAD(&inet_addr_lst[i]);
2418
752d14dc
PE		 2419 register_pernet_subsys(&devinet_ops);
2420
1da177e4
LT		 2421 register_gifconf(PF_INET, inet_gifconf);
2422 register_netdevice_notifier(&ip_netdev_notifier);
63f3444f 2423
906e073f 2424 queue_delayed_work(system_power_efficient_wq, &check_lifetime_work, 0);
5c766d64 2425
9f0f7272
TG		 2426 rtnl_af_register(&inet_af_ops);
2427
c7ac8679
GR		 2428 rtnl_register(PF_INET, RTM_NEWADDR, inet_rtm_newaddr, NULL, NULL);
2429 rtnl_register(PF_INET, RTM_DELADDR, inet_rtm_deladdr, NULL, NULL);
2430 rtnl_register(PF_INET, RTM_GETADDR, NULL, inet_dump_ifaddr, NULL);
9e551110 2431 rtnl_register(PF_INET, RTM_GETNETCONF, inet_netconf_get_devconf,
7a674200 2432 inet_netconf_dump_devconf, NULL);
1da177e4 2433}
Linux 6.x block layer and io_uring tree(s)