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ipv4,ipv6: grab rtnl before locking the socket
[mirror_ubuntu-bionic-kernel.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)
563 ret = __ip_mc_join_group(sk, &mreq);
564 else
565 ret = __ip_mc_leave_group(sk, &mreq);
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);
dfdd5fd4
TG		 588 if (in_dev == NULL) {
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] &&
a7a628c4 596 ifa->ifa_local != nla_get_be32(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 ||
a7a628c4 604 !inet_ifa_match(nla_get_be32(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
DL		 757 err = -EINVAL;
758 if (ifm->ifa_prefixlen > 32 || tb[IFA_LOCAL] == NULL)
5c753978 759 goto errout;
1da177e4 760
4b8aa9ab 761 dev = __dev_get_by_index(net, ifm->ifa_index);
7b218574
DL		 762 err = -ENODEV;
763 if (dev == NULL)
5c753978 764 goto errout;
1da177e4 765
5c753978 766 in_dev = __in_dev_get_rtnl(dev);
7b218574
DL		 767 err = -ENOBUFS;
768 if (in_dev == NULL)
71e27da9 769 goto errout;
1da177e4 770
5c753978 771 ifa = inet_alloc_ifa();
7b218574 772 if (ifa == NULL)
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
783 if (tb[IFA_ADDRESS] == NULL)
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
a7a628c4
AV		 794 ifa->ifa_local = nla_get_be32(tb[IFA_LOCAL]);
795 ifa->ifa_address = nla_get_be32(tb[IFA_ADDRESS]);
5c753978
TG		 796
797 if (tb[IFA_BROADCAST])
a7a628c4 798 ifa->ifa_broadcast = nla_get_be32(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
JP		 884 rtmsg_ifa(RTM_NEWADDR, ifa, nlh, NETLINK_CB(skb).portid);
885 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa);
5c766d64
JP		 886 }
887 return 0;
1da177e4
LT		 888}
889
890/*
891 * Determine a default network mask, based on the IP address.
892 */
893
40384999 894static int inet_abc_len(__be32 addr)
1da177e4
LT		 895{
896 int rc = -1; /* Something else, probably a multicast. */
897
f97c1e0c 898 if (ipv4_is_zeronet(addr))
e905a9ed 899 rc = 0;
1da177e4 900 else {
714e85be 901 __u32 haddr = ntohl(addr);
1da177e4 902
714e85be 903 if (IN_CLASSA(haddr))
1da177e4 904 rc = 8;
714e85be 905 else if (IN_CLASSB(haddr))
1da177e4 906 rc = 16;
714e85be 907 else if (IN_CLASSC(haddr))
1da177e4
LT		 908 rc = 24;
909 }
910
e905a9ed 911 return rc;
1da177e4
LT		 912}
913
914
e5b13cb1 915int devinet_ioctl(struct net *net, unsigned int cmd, void __user *arg)
1da177e4
LT		 916{
917 struct ifreq ifr;
918 struct sockaddr_in sin_orig;
919 struct sockaddr_in *sin = (struct sockaddr_in *)&ifr.ifr_addr;
920 struct in_device *in_dev;
921 struct in_ifaddr **ifap = NULL;
922 struct in_ifaddr *ifa = NULL;
923 struct net_device *dev;
924 char *colon;
925 int ret = -EFAULT;
926 int tryaddrmatch = 0;
927
928 /*
929 * Fetch the caller's info block into kernel space
930 */
931
932 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
933 goto out;
934 ifr.ifr_name[IFNAMSIZ - 1] = 0;
935
936 /* save original address for comparison */
937 memcpy(&sin_orig, sin, sizeof(*sin));
938
939 colon = strchr(ifr.ifr_name, ':');
940 if (colon)
941 *colon = 0;
942
e5b13cb1 943 dev_load(net, ifr.ifr_name);
1da177e4 944
132adf54 945 switch (cmd) {
1da177e4
LT		 946 case SIOCGIFADDR: /* Get interface address */
947 case SIOCGIFBRDADDR: /* Get the broadcast address */
948 case SIOCGIFDSTADDR: /* Get the destination address */
949 case SIOCGIFNETMASK: /* Get the netmask for the interface */
950 /* Note that these ioctls will not sleep,
951 so that we do not impose a lock.
952 One day we will be forced to put shlock here (I mean SMP)
953 */
954 tryaddrmatch = (sin_orig.sin_family == AF_INET);
955 memset(sin, 0, sizeof(*sin));
956 sin->sin_family = AF_INET;
957 break;
958
959 case SIOCSIFFLAGS:
bf5b30b8 960 ret = -EPERM;
52e804c6 961 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 962 goto out;
963 break;
964 case SIOCSIFADDR: /* Set interface address (and family) */
965 case SIOCSIFBRDADDR: /* Set the broadcast address */
966 case SIOCSIFDSTADDR: /* Set the destination address */
967 case SIOCSIFNETMASK: /* Set the netmask for the interface */
bf5b30b8 968 ret = -EPERM;
52e804c6 969 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 970 goto out;
971 ret = -EINVAL;
972 if (sin->sin_family != AF_INET)
973 goto out;
974 break;
975 default:
976 ret = -EINVAL;
977 goto out;
978 }
979
980 rtnl_lock();
981
982 ret = -ENODEV;
9f9354b9
ED		 983 dev = __dev_get_by_name(net, ifr.ifr_name);
984 if (!dev)
1da177e4
LT		 985 goto done;
986
987 if (colon)
988 *colon = ':';
989
9f9354b9
ED		 990 in_dev = __in_dev_get_rtnl(dev);
991 if (in_dev) {
1da177e4
LT		 992 if (tryaddrmatch) {
993 /* Matthias Andree */
994 /* compare label and address (4.4BSD style) */
995 /* note: we only do this for a limited set of ioctls
996 and only if the original address family was AF_INET.
997 This is checked above. */
998 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
999 ifap = &ifa->ifa_next) {
1000 if (!strcmp(ifr.ifr_name, ifa->ifa_label) &&
1001 sin_orig.sin_addr.s_addr ==
6c91afe1 1002 ifa->ifa_local) {
1da177e4
LT		 1003 break; /* found */
1004 }
1005 }
1006 }
1007 /* we didn't get a match, maybe the application is
1008 4.3BSD-style and passed in junk so we fall back to
1009 comparing just the label */
1010 if (!ifa) {
1011 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
1012 ifap = &ifa->ifa_next)
1013 if (!strcmp(ifr.ifr_name, ifa->ifa_label))
1014 break;
1015 }
1016 }
1017
1018 ret = -EADDRNOTAVAIL;
1019 if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS)
1020 goto done;
1021
132adf54 1022 switch (cmd) {
1da177e4
LT		 1023 case SIOCGIFADDR: /* Get interface address */
1024 sin->sin_addr.s_addr = ifa->ifa_local;
1025 goto rarok;
1026
1027 case SIOCGIFBRDADDR: /* Get the broadcast address */
1028 sin->sin_addr.s_addr = ifa->ifa_broadcast;
1029 goto rarok;
1030
1031 case SIOCGIFDSTADDR: /* Get the destination address */
1032 sin->sin_addr.s_addr = ifa->ifa_address;
1033 goto rarok;
1034
1035 case SIOCGIFNETMASK: /* Get the netmask for the interface */
1036 sin->sin_addr.s_addr = ifa->ifa_mask;
1037 goto rarok;
1038
1039 case SIOCSIFFLAGS:
1040 if (colon) {
1041 ret = -EADDRNOTAVAIL;
1042 if (!ifa)
1043 break;
1044 ret = 0;
1045 if (!(ifr.ifr_flags & IFF_UP))
1046 inet_del_ifa(in_dev, ifap, 1);
1047 break;
1048 }
1049 ret = dev_change_flags(dev, ifr.ifr_flags);
1050 break;
1051
1052 case SIOCSIFADDR: /* Set interface address (and family) */
1053 ret = -EINVAL;
1054 if (inet_abc_len(sin->sin_addr.s_addr) < 0)
1055 break;
1056
1057 if (!ifa) {
1058 ret = -ENOBUFS;
9f9354b9
ED		 1059 ifa = inet_alloc_ifa();
1060 if (!ifa)
1da177e4 1061 break;
c7e2e1d7 1062 INIT_HLIST_NODE(&ifa->hash);
1da177e4
LT		 1063 if (colon)
1064 memcpy(ifa->ifa_label, ifr.ifr_name, IFNAMSIZ);
1065 else
1066 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1067 } else {
1068 ret = 0;
1069 if (ifa->ifa_local == sin->sin_addr.s_addr)
1070 break;
1071 inet_del_ifa(in_dev, ifap, 0);
1072 ifa->ifa_broadcast = 0;
148f9729 1073 ifa->ifa_scope = 0;
1da177e4
LT		 1074 }
1075
1076 ifa->ifa_address = ifa->ifa_local = sin->sin_addr.s_addr;
1077
1078 if (!(dev->flags & IFF_POINTOPOINT)) {
1079 ifa->ifa_prefixlen = inet_abc_len(ifa->ifa_address);
1080 ifa->ifa_mask = inet_make_mask(ifa->ifa_prefixlen);
1081 if ((dev->flags & IFF_BROADCAST) &&
1082 ifa->ifa_prefixlen < 31)
1083 ifa->ifa_broadcast = ifa->ifa_address |
1084 ~ifa->ifa_mask;
1085 } else {
1086 ifa->ifa_prefixlen = 32;
1087 ifa->ifa_mask = inet_make_mask(32);
1088 }
5c766d64 1089 set_ifa_lifetime(ifa, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 1090 ret = inet_set_ifa(dev, ifa);
1091 break;
1092
1093 case SIOCSIFBRDADDR: /* Set the broadcast address */
1094 ret = 0;
1095 if (ifa->ifa_broadcast != sin->sin_addr.s_addr) {
1096 inet_del_ifa(in_dev, ifap, 0);
1097 ifa->ifa_broadcast = sin->sin_addr.s_addr;
1098 inet_insert_ifa(ifa);
1099 }
1100 break;
1101
1102 case SIOCSIFDSTADDR: /* Set the destination address */
1103 ret = 0;
1104 if (ifa->ifa_address == sin->sin_addr.s_addr)
1105 break;
1106 ret = -EINVAL;
1107 if (inet_abc_len(sin->sin_addr.s_addr) < 0)
1108 break;
1109 ret = 0;
1110 inet_del_ifa(in_dev, ifap, 0);
1111 ifa->ifa_address = sin->sin_addr.s_addr;
1112 inet_insert_ifa(ifa);
1113 break;
1114
1115 case SIOCSIFNETMASK: /* Set the netmask for the interface */
1116
1117 /*
1118 * The mask we set must be legal.
1119 */
1120 ret = -EINVAL;
1121 if (bad_mask(sin->sin_addr.s_addr, 0))
1122 break;
1123 ret = 0;
1124 if (ifa->ifa_mask != sin->sin_addr.s_addr) {
a144ea4b 1125 __be32 old_mask = ifa->ifa_mask;
1da177e4
LT		 1126 inet_del_ifa(in_dev, ifap, 0);
1127 ifa->ifa_mask = sin->sin_addr.s_addr;
1128 ifa->ifa_prefixlen = inet_mask_len(ifa->ifa_mask);
1129
1130 /* See if current broadcast address matches
1131 * with current netmask, then recalculate
1132 * the broadcast address. Otherwise it's a
1133 * funny address, so don't touch it since
1134 * the user seems to know what (s)he's doing...
1135 */
1136 if ((dev->flags & IFF_BROADCAST) &&
1137 (ifa->ifa_prefixlen < 31) &&
1138 (ifa->ifa_broadcast ==
dcab5e1e 1139 (ifa->ifa_local|~old_mask))) {
1da177e4
LT		 1140 ifa->ifa_broadcast = (ifa->ifa_local |
1141 ~sin->sin_addr.s_addr);
1142 }
1143 inet_insert_ifa(ifa);
1144 }
1145 break;
1146 }
1147done:
1148 rtnl_unlock();
1149out:
1150 return ret;
1151rarok:
1152 rtnl_unlock();
1153 ret = copy_to_user(arg, &ifr, sizeof(struct ifreq)) ? -EFAULT : 0;
1154 goto out;
1155}
1156
1157static int inet_gifconf(struct net_device *dev, char __user *buf, int len)
1158{
e5ed6399 1159 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1da177e4
LT		 1160 struct in_ifaddr *ifa;
1161 struct ifreq ifr;
1162 int done = 0;
1163
9f9354b9 1164 if (!in_dev)
1da177e4
LT		 1165 goto out;
1166
9f9354b9 1167 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1da177e4
LT		 1168 if (!buf) {
1169 done += sizeof(ifr);
1170 continue;
1171 }
1172 if (len < (int) sizeof(ifr))
1173 break;
1174 memset(&ifr, 0, sizeof(struct ifreq));
4299c8a9 1175 strcpy(ifr.ifr_name, ifa->ifa_label);
1da177e4
LT		 1176
1177 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_family = AF_INET;
1178 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_addr.s_addr =
1179 ifa->ifa_local;
1180
1181 if (copy_to_user(buf, &ifr, sizeof(struct ifreq))) {
1182 done = -EFAULT;
1183 break;
1184 }
1185 buf += sizeof(struct ifreq);
1186 len -= sizeof(struct ifreq);
1187 done += sizeof(struct ifreq);
1188 }
1189out:
1190 return done;
1191}
1192
a61ced5d 1193__be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope)
1da177e4 1194{
a61ced5d 1195 __be32 addr = 0;
1da177e4 1196 struct in_device *in_dev;
c346dca1 1197 struct net *net = dev_net(dev);
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:
1da177e4
LT		 1218
1219 /* Not loopback addresses on loopback should be preferred
ca9f1fd2 1220 in this case. It is important that lo is the first interface
1da177e4
LT		 1221 in dev_base list.
1222 */
c6d14c84 1223 for_each_netdev_rcu(net, dev) {
9f9354b9
ED		 1224 in_dev = __in_dev_get_rcu(dev);
1225 if (!in_dev)
1da177e4
LT		 1226 continue;
1227
1228 for_primary_ifa(in_dev) {
1229 if (ifa->ifa_scope != RT_SCOPE_LINK &&
1230 ifa->ifa_scope <= scope) {
1231 addr = ifa->ifa_local;
c6d14c84 1232 goto out_unlock;
1da177e4
LT		 1233 }
1234 } endfor_ifa(in_dev);
1235 }
c6d14c84 1236out_unlock:
1da177e4 1237 rcu_read_unlock();
1da177e4
LT		 1238 return addr;
1239}
9f9354b9 1240EXPORT_SYMBOL(inet_select_addr);
1da177e4 1241
60cad5da
AV		 1242static __be32 confirm_addr_indev(struct in_device *in_dev, __be32 dst,
1243 __be32 local, int scope)
1da177e4
LT		 1244{
1245 int same = 0;
a144ea4b 1246 __be32 addr = 0;
1da177e4
LT		 1247
1248 for_ifa(in_dev) {
1249 if (!addr &&
1250 (local == ifa->ifa_local || !local) &&
1251 ifa->ifa_scope <= scope) {
1252 addr = ifa->ifa_local;
1253 if (same)
1254 break;
1255 }
1256 if (!same) {
1257 same = (!local || inet_ifa_match(local, ifa)) &&
1258 (!dst || inet_ifa_match(dst, ifa));
1259 if (same && addr) {
1260 if (local || !dst)
1261 break;
1262 /* Is the selected addr into dst subnet? */
1263 if (inet_ifa_match(addr, ifa))
1264 break;
1265 /* No, then can we use new local src? */
1266 if (ifa->ifa_scope <= scope) {
1267 addr = ifa->ifa_local;
1268 break;
1269 }
1270 /* search for large dst subnet for addr */
1271 same = 0;
1272 }
1273 }
1274 } endfor_ifa(in_dev);
1275
9f9354b9 1276 return same ? addr : 0;
1da177e4
LT		 1277}
1278
1279/*
1280 * Confirm that local IP address exists using wildcards:
b601fa19
ND		 1281 * - net: netns to check, cannot be NULL
1282 * - in_dev: only on this interface, NULL=any interface
1da177e4
LT		 1283 * - dst: only in the same subnet as dst, 0=any dst
1284 * - local: address, 0=autoselect the local address
1285 * - scope: maximum allowed scope value for the local address
1286 */
b601fa19 1287__be32 inet_confirm_addr(struct net *net, struct in_device *in_dev,
9bd85e32 1288 __be32 dst, __be32 local, int scope)
1da177e4 1289{
60cad5da 1290 __be32 addr = 0;
9bd85e32 1291 struct net_device *dev;
1da177e4 1292
b601fa19 1293 if (in_dev != NULL)
9bd85e32 1294 return confirm_addr_indev(in_dev, dst, local, scope);
1da177e4 1295
1da177e4 1296 rcu_read_lock();
c6d14c84 1297 for_each_netdev_rcu(net, dev) {
9f9354b9
ED		 1298 in_dev = __in_dev_get_rcu(dev);
1299 if (in_dev) {
1da177e4
LT		 1300 addr = confirm_addr_indev(in_dev, dst, local, scope);
1301 if (addr)
1302 break;
1303 }
1304 }
1305 rcu_read_unlock();
1da177e4
LT		 1306
1307 return addr;
1308}
eaddcd76 1309EXPORT_SYMBOL(inet_confirm_addr);
1da177e4
LT		 1310
1311/*
1312 * Device notifier
1313 */
1314
1315int register_inetaddr_notifier(struct notifier_block *nb)
1316{
e041c683 1317 return blocking_notifier_chain_register(&inetaddr_chain, nb);
1da177e4 1318}
9f9354b9 1319EXPORT_SYMBOL(register_inetaddr_notifier);
1da177e4
LT		 1320
1321int unregister_inetaddr_notifier(struct notifier_block *nb)
1322{
e041c683 1323 return blocking_notifier_chain_unregister(&inetaddr_chain, nb);
1da177e4 1324}
9f9354b9 1325EXPORT_SYMBOL(unregister_inetaddr_notifier);
1da177e4 1326
9f9354b9
ED		 1327/* Rename ifa_labels for a device name change. Make some effort to preserve
1328 * existing alias numbering and to create unique labels if possible.
1da177e4
LT		 1329*/
1330static void inetdev_changename(struct net_device *dev, struct in_device *in_dev)
e905a9ed 1331{
1da177e4
LT		 1332 struct in_ifaddr *ifa;
1333 int named = 0;
1334
e905a9ed
YH		 1335 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1336 char old[IFNAMSIZ], *dot;
1da177e4
LT		 1337
1338 memcpy(old, ifa->ifa_label, IFNAMSIZ);
e905a9ed 1339 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1da177e4 1340 if (named++ == 0)
573bf470 1341 goto skip;
44344b2a 1342 dot = strchr(old, ':');
e905a9ed
YH		 1343 if (dot == NULL) {
1344 sprintf(old, ":%d", named);
1da177e4
LT		 1345 dot = old;
1346 }
9f9354b9 1347 if (strlen(dot) + strlen(dev->name) < IFNAMSIZ)
e905a9ed 1348 strcat(ifa->ifa_label, dot);
9f9354b9 1349 else
e905a9ed 1350 strcpy(ifa->ifa_label + (IFNAMSIZ - strlen(dot) - 1), dot);
573bf470
TG		 1351skip:
1352 rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0);
e905a9ed
YH		 1353 }
1354}
1da177e4 1355
40384999 1356static bool inetdev_valid_mtu(unsigned int mtu)
06770843
BL		 1357{
1358 return mtu >= 68;
1359}
1360
d11327ad
IC		 1361static void inetdev_send_gratuitous_arp(struct net_device *dev,
1362 struct in_device *in_dev)
1363
1364{
b76d0789 1365 struct in_ifaddr *ifa;
d11327ad 1366
b76d0789
ZK		 1367 for (ifa = in_dev->ifa_list; ifa;
1368 ifa = ifa->ifa_next) {
1369 arp_send(ARPOP_REQUEST, ETH_P_ARP,
1370 ifa->ifa_local, dev,
1371 ifa->ifa_local, NULL,
1372 dev->dev_addr, NULL);
1373 }
d11327ad
IC		 1374}
1375
1da177e4
LT		 1376/* Called only under RTNL semaphore */
1377
1378static int inetdev_event(struct notifier_block *this, unsigned long event,
1379 void *ptr)
1380{
351638e7 1381 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
748e2d93 1382 struct in_device *in_dev = __in_dev_get_rtnl(dev);
0115e8e3 1383
1da177e4
LT		 1384 ASSERT_RTNL();
1385
1386 if (!in_dev) {
8030f544 1387 if (event == NETDEV_REGISTER) {
1da177e4 1388 in_dev = inetdev_init(dev);
20e61da7
WC		 1389 if (IS_ERR(in_dev))
1390 return notifier_from_errno(PTR_ERR(in_dev));
0cc217e1 1391 if (dev->flags & IFF_LOOPBACK) {
42f811b8
HX		 1392 IN_DEV_CONF_SET(in_dev, NOXFRM, 1);
1393 IN_DEV_CONF_SET(in_dev, NOPOLICY, 1);
8030f544 1394 }
06770843
BL		 1395 } else if (event == NETDEV_CHANGEMTU) {
1396 /* Re-enabling IP */
1397 if (inetdev_valid_mtu(dev->mtu))
1398 in_dev = inetdev_init(dev);
1da177e4
LT		 1399 }
1400 goto out;
1401 }
1402
1403 switch (event) {
1404 case NETDEV_REGISTER:
91df42be 1405 pr_debug("%s: bug\n", __func__);
a9b3cd7f 1406 RCU_INIT_POINTER(dev->ip_ptr, NULL);
1da177e4
LT		 1407 break;
1408 case NETDEV_UP:
06770843 1409 if (!inetdev_valid_mtu(dev->mtu))
1da177e4 1410 break;
0cc217e1 1411 if (dev->flags & IFF_LOOPBACK) {
9f9354b9
ED		 1412 struct in_ifaddr *ifa = inet_alloc_ifa();
1413
1414 if (ifa) {
fd23c3b3 1415 INIT_HLIST_NODE(&ifa->hash);
1da177e4
LT		 1416 ifa->ifa_local =
1417 ifa->ifa_address = htonl(INADDR_LOOPBACK);
1418 ifa->ifa_prefixlen = 8;
1419 ifa->ifa_mask = inet_make_mask(8);
1420 in_dev_hold(in_dev);
1421 ifa->ifa_dev = in_dev;
1422 ifa->ifa_scope = RT_SCOPE_HOST;
1423 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
5c766d64
JP		 1424 set_ifa_lifetime(ifa, INFINITY_LIFE_TIME,
1425 INFINITY_LIFE_TIME);
dfd1582d
JP		 1426 ipv4_devconf_setall(in_dev);
1427 neigh_parms_data_state_setall(in_dev->arp_parms);
1da177e4
LT		 1428 inet_insert_ifa(ifa);
1429 }
1430 }
1431 ip_mc_up(in_dev);
eefef1cf
SH		 1432 /* fall through */
1433 case NETDEV_CHANGEADDR:
d11327ad
IC		 1434 if (!IN_DEV_ARP_NOTIFY(in_dev))
1435 break;
1436 /* fall through */
1437 case NETDEV_NOTIFY_PEERS:
a21090cf 1438 /* Send gratuitous ARP to notify of link change */
d11327ad 1439 inetdev_send_gratuitous_arp(dev, in_dev);
1da177e4
LT		 1440 break;
1441 case NETDEV_DOWN:
1442 ip_mc_down(in_dev);
1443 break;
93d9b7d7 1444 case NETDEV_PRE_TYPE_CHANGE:
75c78500
MS		 1445 ip_mc_unmap(in_dev);
1446 break;
93d9b7d7 1447 case NETDEV_POST_TYPE_CHANGE:
75c78500
MS		 1448 ip_mc_remap(in_dev);
1449 break;
1da177e4 1450 case NETDEV_CHANGEMTU:
06770843 1451 if (inetdev_valid_mtu(dev->mtu))
1da177e4 1452 break;
06770843 1453 /* disable IP when MTU is not enough */
1da177e4
LT		 1454 case NETDEV_UNREGISTER:
1455 inetdev_destroy(in_dev);
1456 break;
1457 case NETDEV_CHANGENAME:
1458 /* Do not notify about label change, this event is
1459 * not interesting to applications using netlink.
1460 */
1461 inetdev_changename(dev, in_dev);
1462
51602b2a 1463 devinet_sysctl_unregister(in_dev);
66f27a52 1464 devinet_sysctl_register(in_dev);
1da177e4
LT		 1465 break;
1466 }
1467out:
1468 return NOTIFY_DONE;
1469}
1470
1471static struct notifier_block ip_netdev_notifier = {
539afedf 1472 .notifier_call = inetdev_event,
1da177e4
LT		 1473};
1474
40384999 1475static size_t inet_nlmsg_size(void)
339bf98f
TG		 1476{
1477 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
1478 + nla_total_size(4) /* IFA_ADDRESS */
1479 + nla_total_size(4) /* IFA_LOCAL */
1480 + nla_total_size(4) /* IFA_BROADCAST */
ad6c8135 1481 + nla_total_size(IFNAMSIZ) /* IFA_LABEL */
63b5f152
GU		 1482 + nla_total_size(4) /* IFA_FLAGS */
1483 + nla_total_size(sizeof(struct ifa_cacheinfo)); /* IFA_CACHEINFO */
339bf98f
TG		 1484}
1485
5c766d64
JP		 1486static inline u32 cstamp_delta(unsigned long cstamp)
1487{
1488 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
1489}
1490
1491static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
1492 unsigned long tstamp, u32 preferred, u32 valid)
1493{
1494 struct ifa_cacheinfo ci;
1495
1496 ci.cstamp = cstamp_delta(cstamp);
1497 ci.tstamp = cstamp_delta(tstamp);
1498 ci.ifa_prefered = preferred;
1499 ci.ifa_valid = valid;
1500
1501 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
1502}
1503
1da177e4 1504static int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa,
15e47304 1505 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4
LT		 1506{
1507 struct ifaddrmsg *ifm;
1508 struct nlmsghdr *nlh;
5c766d64 1509 u32 preferred, valid;
1da177e4 1510
15e47304 1511 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*ifm), flags);
47f68512 1512 if (nlh == NULL)
26932566 1513 return -EMSGSIZE;
47f68512
TG		 1514
1515 ifm = nlmsg_data(nlh);
1da177e4
LT		 1516 ifm->ifa_family = AF_INET;
1517 ifm->ifa_prefixlen = ifa->ifa_prefixlen;
5c766d64 1518 ifm->ifa_flags = ifa->ifa_flags;
1da177e4
LT		 1519 ifm->ifa_scope = ifa->ifa_scope;
1520 ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
47f68512 1521
5c766d64
JP		 1522 if (!(ifm->ifa_flags & IFA_F_PERMANENT)) {
1523 preferred = ifa->ifa_preferred_lft;
1524 valid = ifa->ifa_valid_lft;
1525 if (preferred != INFINITY_LIFE_TIME) {
1526 long tval = (jiffies - ifa->ifa_tstamp) / HZ;
1527
1528 if (preferred > tval)
1529 preferred -= tval;
1530 else
1531 preferred = 0;
1532 if (valid != INFINITY_LIFE_TIME) {
1533 if (valid > tval)
1534 valid -= tval;
1535 else
1536 valid = 0;
1537 }
1538 }
1539 } else {
1540 preferred = INFINITY_LIFE_TIME;
1541 valid = INFINITY_LIFE_TIME;
1542 }
f3756b79
DM		 1543 if ((ifa->ifa_address &&
1544 nla_put_be32(skb, IFA_ADDRESS, ifa->ifa_address)) ||
1545 (ifa->ifa_local &&
1546 nla_put_be32(skb, IFA_LOCAL, ifa->ifa_local)) ||
1547 (ifa->ifa_broadcast &&
1548 nla_put_be32(skb, IFA_BROADCAST, ifa->ifa_broadcast)) ||
1549 (ifa->ifa_label[0] &&
5c766d64 1550 nla_put_string(skb, IFA_LABEL, ifa->ifa_label)) ||
ad6c8135 1551 nla_put_u32(skb, IFA_FLAGS, ifa->ifa_flags) ||
5c766d64
JP		 1552 put_cacheinfo(skb, ifa->ifa_cstamp, ifa->ifa_tstamp,
1553 preferred, valid))
f3756b79 1554 goto nla_put_failure;
1da177e4 1555
053c095a
JB		 1556 nlmsg_end(skb, nlh);
1557 return 0;
47f68512
TG		 1558
1559nla_put_failure:
26932566
PM		 1560 nlmsg_cancel(skb, nlh);
1561 return -EMSGSIZE;
1da177e4
LT		 1562}
1563
1564static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
1565{
3b1e0a65 1566 struct net *net = sock_net(skb->sk);
eec4df98
ED		 1567 int h, s_h;
1568 int idx, s_idx;
1569 int ip_idx, s_ip_idx;
1da177e4
LT		 1570 struct net_device *dev;
1571 struct in_device *in_dev;
1572 struct in_ifaddr *ifa;
eec4df98 1573 struct hlist_head *head;
1da177e4 1574
eec4df98
ED		 1575 s_h = cb->args[0];
1576 s_idx = idx = cb->args[1];
1577 s_ip_idx = ip_idx = cb->args[2];
1578
1579 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1580 idx = 0;
1581 head = &net->dev_index_head[h];
1582 rcu_read_lock();
0465277f
ND		 1583 cb->seq = atomic_read(&net->ipv4.dev_addr_genid) ^
1584 net->dev_base_seq;
b67bfe0d 1585 hlist_for_each_entry_rcu(dev, head, index_hlist) {
eec4df98
ED		 1586 if (idx < s_idx)
1587 goto cont;
4b97efdf 1588 if (h > s_h || idx > s_idx)
eec4df98
ED		 1589 s_ip_idx = 0;
1590 in_dev = __in_dev_get_rcu(dev);
1591 if (!in_dev)
1592 goto cont;
1da177e4 1593
eec4df98
ED		 1594 for (ifa = in_dev->ifa_list, ip_idx = 0; ifa;
1595 ifa = ifa->ifa_next, ip_idx++) {
1596 if (ip_idx < s_ip_idx)
1597 continue;
1598 if (inet_fill_ifaddr(skb, ifa,
15e47304 1599 NETLINK_CB(cb->skb).portid,
1da177e4 1600 cb->nlh->nlmsg_seq,
053c095a 1601 RTM_NEWADDR, NLM_F_MULTI) < 0) {
eec4df98
ED		 1602 rcu_read_unlock();
1603 goto done;
1604 }
0465277f 1605 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
eec4df98 1606 }
7562f876 1607cont:
eec4df98
ED		 1608 idx++;
1609 }
1610 rcu_read_unlock();
1da177e4
LT		 1611 }
1612
1613done:
eec4df98
ED		 1614 cb->args[0] = h;
1615 cb->args[1] = idx;
1616 cb->args[2] = ip_idx;
1da177e4
LT		 1617
1618 return skb->len;
1619}
1620
539afedf 1621static void rtmsg_ifa(int event, struct in_ifaddr *ifa, struct nlmsghdr *nlh,
15e47304 1622 u32 portid)
1da177e4 1623{
47f68512 1624 struct sk_buff *skb;
d6062cbb
TG		 1625 u32 seq = nlh ? nlh->nlmsg_seq : 0;
1626 int err = -ENOBUFS;
4b8aa9ab 1627 struct net *net;
1da177e4 1628
c346dca1 1629 net = dev_net(ifa->ifa_dev->dev);
339bf98f 1630 skb = nlmsg_new(inet_nlmsg_size(), GFP_KERNEL);
47f68512 1631 if (skb == NULL)
d6062cbb
TG		 1632 goto errout;
1633
15e47304 1634 err = inet_fill_ifaddr(skb, ifa, portid, seq, event, 0);
26932566
PM		 1635 if (err < 0) {
1636 /* -EMSGSIZE implies BUG in inet_nlmsg_size() */
1637 WARN_ON(err == -EMSGSIZE);
1638 kfree_skb(skb);
1639 goto errout;
1640 }
15e47304 1641 rtnl_notify(skb, net, portid, RTNLGRP_IPV4_IFADDR, nlh, GFP_KERNEL);
1ce85fe4 1642 return;
d6062cbb
TG		 1643errout:
1644 if (err < 0)
4b8aa9ab 1645 rtnl_set_sk_err(net, RTNLGRP_IPV4_IFADDR, err);
1da177e4
LT		 1646}
1647
9f0f7272
TG		 1648static size_t inet_get_link_af_size(const struct net_device *dev)
1649{
1fc19aff 1650 struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr);
9f0f7272
TG		 1651
1652 if (!in_dev)
1653 return 0;
1654
1655 return nla_total_size(IPV4_DEVCONF_MAX * 4); /* IFLA_INET_CONF */
1656}
1657
1658static int inet_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
1659{
1fc19aff 1660 struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr);
9f0f7272
TG		 1661 struct nlattr *nla;
1662 int i;
1663
1664 if (!in_dev)
1665 return -ENODATA;
1666
1667 nla = nla_reserve(skb, IFLA_INET_CONF, IPV4_DEVCONF_MAX * 4);
1668 if (nla == NULL)
1669 return -EMSGSIZE;
1670
1671 for (i = 0; i < IPV4_DEVCONF_MAX; i++)
1672 ((u32 *) nla_data(nla))[i] = in_dev->cnf.data[i];
1673
1674 return 0;
1675}
1676
1677static const struct nla_policy inet_af_policy[IFLA_INET_MAX+1] = {
1678 [IFLA_INET_CONF] = { .type = NLA_NESTED },
1679};
1680
cf7afbfe
TG		 1681static int inet_validate_link_af(const struct net_device *dev,
1682 const struct nlattr *nla)
9f0f7272 1683{
9f0f7272
TG		 1684 struct nlattr *a, *tb[IFLA_INET_MAX+1];
1685 int err, rem;
1686
f7fce74e 1687 if (dev && !__in_dev_get_rtnl(dev))
cf7afbfe 1688 return -EAFNOSUPPORT;
9f0f7272
TG		 1689
1690 err = nla_parse_nested(tb, IFLA_INET_MAX, nla, inet_af_policy);
1691 if (err < 0)
1692 return err;
1693
1694 if (tb[IFLA_INET_CONF]) {
1695 nla_for_each_nested(a, tb[IFLA_INET_CONF], rem) {
1696 int cfgid = nla_type(a);
1697
1698 if (nla_len(a) < 4)
1699 return -EINVAL;
1700
1701 if (cfgid <= 0 || cfgid > IPV4_DEVCONF_MAX)
1702 return -EINVAL;
1703 }
1704 }
1705
cf7afbfe
TG		 1706 return 0;
1707}
1708
1709static int inet_set_link_af(struct net_device *dev, const struct nlattr *nla)
1710{
f7fce74e 1711 struct in_device *in_dev = __in_dev_get_rtnl(dev);
cf7afbfe
TG		 1712 struct nlattr *a, *tb[IFLA_INET_MAX+1];
1713 int rem;
1714
1715 if (!in_dev)
1716 return -EAFNOSUPPORT;
1717
1718 if (nla_parse_nested(tb, IFLA_INET_MAX, nla, NULL) < 0)
1719 BUG();
1720
9f0f7272
TG		 1721 if (tb[IFLA_INET_CONF]) {
1722 nla_for_each_nested(a, tb[IFLA_INET_CONF], rem)
1723 ipv4_devconf_set(in_dev, nla_type(a), nla_get_u32(a));
1724 }
1725
1726 return 0;
1727}
1728
edc9e748
ND		 1729static int inet_netconf_msgsize_devconf(int type)
1730{
1731 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
1732 + nla_total_size(4); /* NETCONFA_IFINDEX */
1733
9e551110
ND		 1734 /* type -1 is used for ALL */
1735 if (type == -1 || type == NETCONFA_FORWARDING)
edc9e748 1736 size += nla_total_size(4);
cc535dfb
ND		 1737 if (type == -1 || type == NETCONFA_RP_FILTER)
1738 size += nla_total_size(4);
d67b8c61
ND		 1739 if (type == -1 || type == NETCONFA_MC_FORWARDING)
1740 size += nla_total_size(4);
09aea5df 1741 if (type == -1 || type == NETCONFA_PROXY_NEIGH)
f085ff1c 1742 size += nla_total_size(4);
edc9e748
ND		 1743
1744 return size;
1745}
1746
1747static int inet_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
1748 struct ipv4_devconf *devconf, u32 portid,
1749 u32 seq, int event, unsigned int flags,
1750 int type)
1751{
1752 struct nlmsghdr *nlh;
1753 struct netconfmsg *ncm;
1754
1755 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
1756 flags);
1757 if (nlh == NULL)
1758 return -EMSGSIZE;
1759
1760 ncm = nlmsg_data(nlh);
1761 ncm->ncm_family = AF_INET;
1762
1763 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
1764 goto nla_put_failure;
1765
9e551110
ND		 1766 /* type -1 is used for ALL */
1767 if ((type == -1 || type == NETCONFA_FORWARDING) &&
edc9e748
ND		 1768 nla_put_s32(skb, NETCONFA_FORWARDING,
1769 IPV4_DEVCONF(*devconf, FORWARDING)) < 0)
1770 goto nla_put_failure;
cc535dfb
ND		 1771 if ((type == -1 || type == NETCONFA_RP_FILTER) &&
1772 nla_put_s32(skb, NETCONFA_RP_FILTER,
1773 IPV4_DEVCONF(*devconf, RP_FILTER)) < 0)
1774 goto nla_put_failure;
d67b8c61
ND		 1775 if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
1776 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
1777 IPV4_DEVCONF(*devconf, MC_FORWARDING)) < 0)
1778 goto nla_put_failure;
09aea5df 1779 if ((type == -1 || type == NETCONFA_PROXY_NEIGH) &&
1780 nla_put_s32(skb, NETCONFA_PROXY_NEIGH,
f085ff1c 1781 IPV4_DEVCONF(*devconf, PROXY_ARP)) < 0)
1782 goto nla_put_failure;
edc9e748 1783
053c095a
JB		 1784 nlmsg_end(skb, nlh);
1785 return 0;
edc9e748
ND		 1786
1787nla_put_failure:
1788 nlmsg_cancel(skb, nlh);
1789 return -EMSGSIZE;
1790}
1791
d67b8c61
ND		 1792void inet_netconf_notify_devconf(struct net *net, int type, int ifindex,
1793 struct ipv4_devconf *devconf)
edc9e748
ND		 1794{
1795 struct sk_buff *skb;
1796 int err = -ENOBUFS;
1797
1798 skb = nlmsg_new(inet_netconf_msgsize_devconf(type), GFP_ATOMIC);
1799 if (skb == NULL)
1800 goto errout;
1801
1802 err = inet_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
1803 RTM_NEWNETCONF, 0, type);
1804 if (err < 0) {
1805 /* -EMSGSIZE implies BUG in inet_netconf_msgsize_devconf() */
1806 WARN_ON(err == -EMSGSIZE);
1807 kfree_skb(skb);
1808 goto errout;
1809 }
1810 rtnl_notify(skb, net, 0, RTNLGRP_IPV4_NETCONF, NULL, GFP_ATOMIC);
1811 return;
1812errout:
1813 if (err < 0)
1814 rtnl_set_sk_err(net, RTNLGRP_IPV4_NETCONF, err);
1815}
1816
9e551110
ND		 1817static const struct nla_policy devconf_ipv4_policy[NETCONFA_MAX+1] = {
1818 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
1819 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
cc535dfb 1820 [NETCONFA_RP_FILTER] = { .len = sizeof(int) },
09aea5df 1821 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
9e551110
ND		 1822};
1823
1824static int inet_netconf_get_devconf(struct sk_buff *in_skb,
661d2967 1825 struct nlmsghdr *nlh)
9e551110
ND		 1826{
1827 struct net *net = sock_net(in_skb->sk);
1828 struct nlattr *tb[NETCONFA_MAX+1];
1829 struct netconfmsg *ncm;
1830 struct sk_buff *skb;
1831 struct ipv4_devconf *devconf;
1832 struct in_device *in_dev;
1833 struct net_device *dev;
1834 int ifindex;
1835 int err;
1836
1837 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
1838 devconf_ipv4_policy);
1839 if (err < 0)
1840 goto errout;
1841
1842 err = EINVAL;
1843 if (!tb[NETCONFA_IFINDEX])
1844 goto errout;
1845
1846 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
1847 switch (ifindex) {
1848 case NETCONFA_IFINDEX_ALL:
1849 devconf = net->ipv4.devconf_all;
1850 break;
1851 case NETCONFA_IFINDEX_DEFAULT:
1852 devconf = net->ipv4.devconf_dflt;
1853 break;
1854 default:
1855 dev = __dev_get_by_index(net, ifindex);
1856 if (dev == NULL)
1857 goto errout;
1858 in_dev = __in_dev_get_rtnl(dev);
1859 if (in_dev == NULL)
1860 goto errout;
1861 devconf = &in_dev->cnf;
1862 break;
1863 }
1864
1865 err = -ENOBUFS;
1866 skb = nlmsg_new(inet_netconf_msgsize_devconf(-1), GFP_ATOMIC);
1867 if (skb == NULL)
1868 goto errout;
1869
1870 err = inet_netconf_fill_devconf(skb, ifindex, devconf,
1871 NETLINK_CB(in_skb).portid,
1872 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
1873 -1);
1874 if (err < 0) {
1875 /* -EMSGSIZE implies BUG in inet_netconf_msgsize_devconf() */
1876 WARN_ON(err == -EMSGSIZE);
1877 kfree_skb(skb);
1878 goto errout;
1879 }
1880 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
1881errout:
1882 return err;
1883}
1884
7a674200
ND		 1885static int inet_netconf_dump_devconf(struct sk_buff *skb,
1886 struct netlink_callback *cb)
1887{
1888 struct net *net = sock_net(skb->sk);
1889 int h, s_h;
1890 int idx, s_idx;
1891 struct net_device *dev;
1892 struct in_device *in_dev;
1893 struct hlist_head *head;
1894
1895 s_h = cb->args[0];
1896 s_idx = idx = cb->args[1];
1897
1898 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1899 idx = 0;
1900 head = &net->dev_index_head[h];
1901 rcu_read_lock();
0465277f
ND		 1902 cb->seq = atomic_read(&net->ipv4.dev_addr_genid) ^
1903 net->dev_base_seq;
7a674200
ND		 1904 hlist_for_each_entry_rcu(dev, head, index_hlist) {
1905 if (idx < s_idx)
1906 goto cont;
1907 in_dev = __in_dev_get_rcu(dev);
1908 if (!in_dev)
1909 goto cont;
1910
1911 if (inet_netconf_fill_devconf(skb, dev->ifindex,
1912 &in_dev->cnf,
1913 NETLINK_CB(cb->skb).portid,
1914 cb->nlh->nlmsg_seq,
1915 RTM_NEWNETCONF,
1916 NLM_F_MULTI,
7b46a644 1917 -1) < 0) {
7a674200
ND		 1918 rcu_read_unlock();
1919 goto done;
1920 }
0465277f 1921 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7a674200
ND		 1922cont:
1923 idx++;
1924 }
1925 rcu_read_unlock();
1926 }
1927 if (h == NETDEV_HASHENTRIES) {
1928 if (inet_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
1929 net->ipv4.devconf_all,
1930 NETLINK_CB(cb->skb).portid,
1931 cb->nlh->nlmsg_seq,
1932 RTM_NEWNETCONF, NLM_F_MULTI,
7b46a644 1933 -1) < 0)
7a674200
ND		 1934 goto done;
1935 else
1936 h++;
1937 }
1938 if (h == NETDEV_HASHENTRIES + 1) {
1939 if (inet_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
1940 net->ipv4.devconf_dflt,
1941 NETLINK_CB(cb->skb).portid,
1942 cb->nlh->nlmsg_seq,
1943 RTM_NEWNETCONF, NLM_F_MULTI,
7b46a644 1944 -1) < 0)
7a674200
ND		 1945 goto done;
1946 else
1947 h++;
1948 }
1949done:
1950 cb->args[0] = h;
1951 cb->args[1] = idx;
1952
1953 return skb->len;
1954}
1955
1da177e4
LT		 1956#ifdef CONFIG_SYSCTL
1957
c0ce9fb3 1958static void devinet_copy_dflt_conf(struct net *net, int i)
31be3085
HX		 1959{
1960 struct net_device *dev;
1961
c6d14c84
ED		 1962 rcu_read_lock();
1963 for_each_netdev_rcu(net, dev) {
31be3085 1964 struct in_device *in_dev;
c6d14c84 1965
31be3085
HX		 1966 in_dev = __in_dev_get_rcu(dev);
1967 if (in_dev && !test_bit(i, in_dev->cnf.state))
9355bbd6 1968 in_dev->cnf.data[i] = net->ipv4.devconf_dflt->data[i];
31be3085 1969 }
c6d14c84 1970 rcu_read_unlock();
31be3085
HX		 1971}
1972
c6d14c84 1973/* called with RTNL locked */
c0ce9fb3 1974static void inet_forward_change(struct net *net)
68dd299b
PE		 1975{
1976 struct net_device *dev;
586f1211 1977 int on = IPV4_DEVCONF_ALL(net, FORWARDING);
68dd299b 1978
586f1211 1979 IPV4_DEVCONF_ALL(net, ACCEPT_REDIRECTS) = !on;
9355bbd6 1980 IPV4_DEVCONF_DFLT(net, FORWARDING) = on;
edc9e748
ND		 1981 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING,
1982 NETCONFA_IFINDEX_ALL,
1983 net->ipv4.devconf_all);
1984 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING,
1985 NETCONFA_IFINDEX_DEFAULT,
1986 net->ipv4.devconf_dflt);
68dd299b 1987
c0ce9fb3 1988 for_each_netdev(net, dev) {
68dd299b 1989 struct in_device *in_dev;
0187bdfb
BH		 1990 if (on)
1991 dev_disable_lro(dev);
68dd299b
PE		 1992 rcu_read_lock();
1993 in_dev = __in_dev_get_rcu(dev);
edc9e748 1994 if (in_dev) {
68dd299b 1995 IN_DEV_CONF_SET(in_dev, FORWARDING, on);
edc9e748
ND		 1996 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING,
1997 dev->ifindex, &in_dev->cnf);
1998 }
68dd299b
PE		 1999 rcu_read_unlock();
2000 }
68dd299b
PE		 2001}
2002
f085ff1c 2003static int devinet_conf_ifindex(struct net *net, struct ipv4_devconf *cnf)
2004{
2005 if (cnf == net->ipv4.devconf_dflt)
2006 return NETCONFA_IFINDEX_DEFAULT;
2007 else if (cnf == net->ipv4.devconf_all)
2008 return NETCONFA_IFINDEX_ALL;
2009 else {
2010 struct in_device *idev
2011 = container_of(cnf, struct in_device, cnf);
2012 return idev->dev->ifindex;
2013 }
2014}
2015
fe2c6338 2016static int devinet_conf_proc(struct ctl_table *ctl, int write,
8d65af78 2017 void __user *buffer,
31be3085
HX		 2018 size_t *lenp, loff_t *ppos)
2019{
d01ff0a0 2020 int old_value = *(int *)ctl->data;
8d65af78 2021 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
d01ff0a0 2022 int new_value = *(int *)ctl->data;
31be3085
HX		 2023
2024 if (write) {
2025 struct ipv4_devconf *cnf = ctl->extra1;
c0ce9fb3 2026 struct net *net = ctl->extra2;
31be3085 2027 int i = (int *)ctl->data - cnf->data;
f085ff1c 2028 int ifindex;
31be3085
HX		 2029
2030 set_bit(i, cnf->state);
2031
9355bbd6 2032 if (cnf == net->ipv4.devconf_dflt)
c0ce9fb3 2033 devinet_copy_dflt_conf(net, i);
d0daebc3
TG		 2034 if (i == IPV4_DEVCONF_ACCEPT_LOCAL - 1 ||
2035 i == IPV4_DEVCONF_ROUTE_LOCALNET - 1)
d01ff0a0 2036 if ((new_value == 0) && (old_value != 0))
4ccfe6d4 2037 rt_cache_flush(net);
f085ff1c 2038
cc535dfb
ND		 2039 if (i == IPV4_DEVCONF_RP_FILTER - 1 &&
2040 new_value != old_value) {
f085ff1c 2041 ifindex = devinet_conf_ifindex(net, cnf);
cc535dfb
ND		 2042 inet_netconf_notify_devconf(net, NETCONFA_RP_FILTER,
2043 ifindex, cnf);
2044 }
f085ff1c 2045 if (i == IPV4_DEVCONF_PROXY_ARP - 1 &&
2046 new_value != old_value) {
2047 ifindex = devinet_conf_ifindex(net, cnf);
09aea5df 2048 inet_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
f085ff1c 2049 ifindex, cnf);
2050 }
31be3085
HX		 2051 }
2052
2053 return ret;
2054}
2055
fe2c6338 2056static int devinet_sysctl_forward(struct ctl_table *ctl, int write,
8d65af78 2057 void __user *buffer,
1da177e4
LT		 2058 size_t *lenp, loff_t *ppos)
2059{
2060 int *valp = ctl->data;
2061 int val = *valp;
88af182e 2062 loff_t pos = *ppos;
8d65af78 2063 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
1da177e4
LT		 2064
2065 if (write && *valp != val) {
c0ce9fb3
PE		 2066 struct net *net = ctl->extra2;
2067
0187bdfb 2068 if (valp != &IPV4_DEVCONF_DFLT(net, FORWARDING)) {
88af182e
EB		 2069 if (!rtnl_trylock()) {
2070 /* Restore the original values before restarting */
2071 *valp = val;
2072 *ppos = pos;
9b8adb5e 2073 return restart_syscall();
88af182e 2074 }
0187bdfb
BH		 2075 if (valp == &IPV4_DEVCONF_ALL(net, FORWARDING)) {
2076 inet_forward_change(net);
edc9e748 2077 } else {
0187bdfb
BH		 2078 struct ipv4_devconf *cnf = ctl->extra1;
2079 struct in_device *idev =
2080 container_of(cnf, struct in_device, cnf);
edc9e748
ND		 2081 if (*valp)
2082 dev_disable_lro(idev->dev);
2083 inet_netconf_notify_devconf(net,
2084 NETCONFA_FORWARDING,
2085 idev->dev->ifindex,
2086 cnf);
0187bdfb
BH		 2087 }
2088 rtnl_unlock();
4ccfe6d4 2089 rt_cache_flush(net);
edc9e748
ND		 2090 } else
2091 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING,
2092 NETCONFA_IFINDEX_DEFAULT,
2093 net->ipv4.devconf_dflt);
1da177e4
LT		 2094 }
2095
2096 return ret;
2097}
2098
fe2c6338 2099static int ipv4_doint_and_flush(struct ctl_table *ctl, int write,
323e126f
DM		 2100 void __user *buffer,
2101 size_t *lenp, loff_t *ppos)
1da177e4
LT		 2102{
2103 int *valp = ctl->data;
2104 int val = *valp;
8d65af78 2105 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
76e6ebfb 2106 struct net *net = ctl->extra2;
1da177e4
LT		 2107
2108 if (write && *valp != val)
4ccfe6d4 2109 rt_cache_flush(net);
1da177e4
LT		 2110
2111 return ret;
2112}
2113
f8572d8f 2114#define DEVINET_SYSCTL_ENTRY(attr, name, mval, proc) \
42f811b8 2115 { \
42f811b8
HX		 2116 .procname = name, \
2117 .data = ipv4_devconf.data + \
02291680 2118 IPV4_DEVCONF_ ## attr - 1, \
42f811b8
HX		 2119 .maxlen = sizeof(int), \
2120 .mode = mval, \
2121 .proc_handler = proc, \
31be3085 2122 .extra1 = &ipv4_devconf, \
42f811b8
HX		 2123 }
2124
2125#define DEVINET_SYSCTL_RW_ENTRY(attr, name) \
f8572d8f 2126 DEVINET_SYSCTL_ENTRY(attr, name, 0644, devinet_conf_proc)
42f811b8
HX		 2127
2128#define DEVINET_SYSCTL_RO_ENTRY(attr, name) \
f8572d8f 2129 DEVINET_SYSCTL_ENTRY(attr, name, 0444, devinet_conf_proc)
42f811b8 2130
f8572d8f
EB		 2131#define DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, proc) \
2132 DEVINET_SYSCTL_ENTRY(attr, name, 0644, proc)
42f811b8
HX		 2133
2134#define DEVINET_SYSCTL_FLUSHING_ENTRY(attr, name) \
f8572d8f 2135 DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, ipv4_doint_and_flush)
42f811b8 2136
1da177e4
LT		 2137static struct devinet_sysctl_table {
2138 struct ctl_table_header *sysctl_header;
02291680 2139 struct ctl_table devinet_vars[__IPV4_DEVCONF_MAX];
1da177e4
LT		 2140} devinet_sysctl = {
2141 .devinet_vars = {
42f811b8 2142 DEVINET_SYSCTL_COMPLEX_ENTRY(FORWARDING, "forwarding",
f8572d8f 2143 devinet_sysctl_forward),
42f811b8
HX		 2144 DEVINET_SYSCTL_RO_ENTRY(MC_FORWARDING, "mc_forwarding"),
2145
2146 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_REDIRECTS, "accept_redirects"),
2147 DEVINET_SYSCTL_RW_ENTRY(SECURE_REDIRECTS, "secure_redirects"),
2148 DEVINET_SYSCTL_RW_ENTRY(SHARED_MEDIA, "shared_media"),
2149 DEVINET_SYSCTL_RW_ENTRY(RP_FILTER, "rp_filter"),
2150 DEVINET_SYSCTL_RW_ENTRY(SEND_REDIRECTS, "send_redirects"),
2151 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_SOURCE_ROUTE,
2152 "accept_source_route"),
8153a10c 2153 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_LOCAL, "accept_local"),
28f6aeea 2154 DEVINET_SYSCTL_RW_ENTRY(SRC_VMARK, "src_valid_mark"),
42f811b8
HX		 2155 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP, "proxy_arp"),
2156 DEVINET_SYSCTL_RW_ENTRY(MEDIUM_ID, "medium_id"),
2157 DEVINET_SYSCTL_RW_ENTRY(BOOTP_RELAY, "bootp_relay"),
2158 DEVINET_SYSCTL_RW_ENTRY(LOG_MARTIANS, "log_martians"),
2159 DEVINET_SYSCTL_RW_ENTRY(TAG, "tag"),
2160 DEVINET_SYSCTL_RW_ENTRY(ARPFILTER, "arp_filter"),
2161 DEVINET_SYSCTL_RW_ENTRY(ARP_ANNOUNCE, "arp_announce"),
2162 DEVINET_SYSCTL_RW_ENTRY(ARP_IGNORE, "arp_ignore"),
2163 DEVINET_SYSCTL_RW_ENTRY(ARP_ACCEPT, "arp_accept"),
eefef1cf 2164 DEVINET_SYSCTL_RW_ENTRY(ARP_NOTIFY, "arp_notify"),
65324144 2165 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP_PVLAN, "proxy_arp_pvlan"),
5c6fe01c
WM		 2166 DEVINET_SYSCTL_RW_ENTRY(FORCE_IGMP_VERSION,
2167 "force_igmp_version"),
2690048c
WM		 2168 DEVINET_SYSCTL_RW_ENTRY(IGMPV2_UNSOLICITED_REPORT_INTERVAL,
2169 "igmpv2_unsolicited_report_interval"),
2170 DEVINET_SYSCTL_RW_ENTRY(IGMPV3_UNSOLICITED_REPORT_INTERVAL,
2171 "igmpv3_unsolicited_report_interval"),
42f811b8
HX		 2172
2173 DEVINET_SYSCTL_FLUSHING_ENTRY(NOXFRM, "disable_xfrm"),
2174 DEVINET_SYSCTL_FLUSHING_ENTRY(NOPOLICY, "disable_policy"),
42f811b8
HX		 2175 DEVINET_SYSCTL_FLUSHING_ENTRY(PROMOTE_SECONDARIES,
2176 "promote_secondaries"),
d0daebc3
TG		 2177 DEVINET_SYSCTL_FLUSHING_ENTRY(ROUTE_LOCALNET,
2178 "route_localnet"),
1da177e4 2179 },
1da177e4
LT		 2180};
2181
ea40b324 2182static int __devinet_sysctl_register(struct net *net, char *dev_name,
f8572d8f 2183 struct ipv4_devconf *p)
1da177e4
LT		 2184{
2185 int i;
9fa89642 2186 struct devinet_sysctl_table *t;
8607ddb8 2187 char path[sizeof("net/ipv4/conf/") + IFNAMSIZ];
bfada697 2188
9fa89642 2189 t = kmemdup(&devinet_sysctl, sizeof(*t), GFP_KERNEL);
1da177e4 2190 if (!t)
9fa89642
PE		 2191 goto out;
2192
1da177e4
LT		 2193 for (i = 0; i < ARRAY_SIZE(t->devinet_vars) - 1; i++) {
2194 t->devinet_vars[i].data += (char *)p - (char *)&ipv4_devconf;
31be3085 2195 t->devinet_vars[i].extra1 = p;
c0ce9fb3 2196 t->devinet_vars[i].extra2 = net;
1da177e4
LT		 2197 }
2198
8607ddb8 2199 snprintf(path, sizeof(path), "net/ipv4/conf/%s", dev_name);
1da177e4 2200
8607ddb8 2201 t->sysctl_header = register_net_sysctl(net, path, t->devinet_vars);
1da177e4 2202 if (!t->sysctl_header)
8607ddb8 2203 goto free;
1da177e4
LT		 2204
2205 p->sysctl = t;
ea40b324 2206 return 0;
1da177e4 2207
9fa89642 2208free:
1da177e4 2209 kfree(t);
9fa89642 2210out:
ea40b324 2211 return -ENOBUFS;
1da177e4
LT		 2212}
2213
51602b2a
PE		 2214static void __devinet_sysctl_unregister(struct ipv4_devconf *cnf)
2215{
2216 struct devinet_sysctl_table *t = cnf->sysctl;
2217
2218 if (t == NULL)
2219 return;
2220
2221 cnf->sysctl = NULL;
ff538818 2222 unregister_net_sysctl_table(t->sysctl_header);
51602b2a
PE		 2223 kfree(t);
2224}
2225
20e61da7 2226static int devinet_sysctl_register(struct in_device *idev)
66f27a52 2227{
20e61da7
WC		 2228 int err;
2229
2230 if (!sysctl_dev_name_is_allowed(idev->dev->name))
2231 return -EINVAL;
2232
2233 err = neigh_sysctl_register(idev->dev, idev->arp_parms, NULL);
2234 if (err)
2235 return err;
2236 err = __devinet_sysctl_register(dev_net(idev->dev), idev->dev->name,
f8572d8f 2237 &idev->cnf);
20e61da7
WC		 2238 if (err)
2239 neigh_sysctl_unregister(idev->arp_parms);
2240 return err;
66f27a52
PE		 2241}
2242
51602b2a 2243static void devinet_sysctl_unregister(struct in_device *idev)
1da177e4 2244{
51602b2a
PE		 2245 __devinet_sysctl_unregister(&idev->cnf);
2246 neigh_sysctl_unregister(idev->arp_parms);
1da177e4 2247}
1da177e4 2248
68dd299b
PE		 2249static struct ctl_table ctl_forward_entry[] = {
2250 {
68dd299b
PE		 2251 .procname = "ip_forward",
2252 .data = &ipv4_devconf.data[
02291680 2253 IPV4_DEVCONF_FORWARDING - 1],
68dd299b
PE		 2254 .maxlen = sizeof(int),
2255 .mode = 0644,
2256 .proc_handler = devinet_sysctl_forward,
68dd299b 2257 .extra1 = &ipv4_devconf,
c0ce9fb3 2258 .extra2 = &init_net,
68dd299b
PE		 2259 },
2260 { },
2261};
2a75de0c 2262#endif
68dd299b 2263
752d14dc
PE		 2264static __net_init int devinet_init_net(struct net *net)
2265{
2266 int err;
752d14dc 2267 struct ipv4_devconf *all, *dflt;
2a75de0c
ED		 2268#ifdef CONFIG_SYSCTL
2269 struct ctl_table *tbl = ctl_forward_entry;
752d14dc 2270 struct ctl_table_header *forw_hdr;
2a75de0c 2271#endif
752d14dc
PE		 2272
2273 err = -ENOMEM;
2274 all = &ipv4_devconf;
2275 dflt = &ipv4_devconf_dflt;
752d14dc 2276
09ad9bc7 2277 if (!net_eq(net, &init_net)) {
752d14dc
PE		 2278 all = kmemdup(all, sizeof(ipv4_devconf), GFP_KERNEL);
2279 if (all == NULL)
2280 goto err_alloc_all;
2281
2282 dflt = kmemdup(dflt, sizeof(ipv4_devconf_dflt), GFP_KERNEL);
2283 if (dflt == NULL)
2284 goto err_alloc_dflt;
2285
2a75de0c 2286#ifdef CONFIG_SYSCTL
752d14dc
PE		 2287 tbl = kmemdup(tbl, sizeof(ctl_forward_entry), GFP_KERNEL);
2288 if (tbl == NULL)
2289 goto err_alloc_ctl;
2290
02291680 2291 tbl[0].data = &all->data[IPV4_DEVCONF_FORWARDING - 1];
752d14dc
PE		 2292 tbl[0].extra1 = all;
2293 tbl[0].extra2 = net;
2a75de0c 2294#endif
752d14dc
PE		 2295 }
2296
2297#ifdef CONFIG_SYSCTL
f8572d8f 2298 err = __devinet_sysctl_register(net, "all", all);
752d14dc
PE		 2299 if (err < 0)
2300 goto err_reg_all;
2301
f8572d8f 2302 err = __devinet_sysctl_register(net, "default", dflt);
752d14dc
PE		 2303 if (err < 0)
2304 goto err_reg_dflt;
2305
2306 err = -ENOMEM;
8607ddb8 2307 forw_hdr = register_net_sysctl(net, "net/ipv4", tbl);
752d14dc
PE		 2308 if (forw_hdr == NULL)
2309 goto err_reg_ctl;
2a75de0c 2310 net->ipv4.forw_hdr = forw_hdr;
752d14dc
PE		 2311#endif
2312
752d14dc
PE		 2313 net->ipv4.devconf_all = all;
2314 net->ipv4.devconf_dflt = dflt;
2315 return 0;
2316
2317#ifdef CONFIG_SYSCTL
2318err_reg_ctl:
2319 __devinet_sysctl_unregister(dflt);
2320err_reg_dflt:
2321 __devinet_sysctl_unregister(all);
2322err_reg_all:
2323 if (tbl != ctl_forward_entry)
2324 kfree(tbl);
752d14dc 2325err_alloc_ctl:
2a75de0c 2326#endif
752d14dc
PE		 2327 if (dflt != &ipv4_devconf_dflt)
2328 kfree(dflt);
2329err_alloc_dflt:
2330 if (all != &ipv4_devconf)
2331 kfree(all);
2332err_alloc_all:
2333 return err;
2334}
2335
2336static __net_exit void devinet_exit_net(struct net *net)
2337{
2a75de0c 2338#ifdef CONFIG_SYSCTL
752d14dc
PE		 2339 struct ctl_table *tbl;
2340
2341 tbl = net->ipv4.forw_hdr->ctl_table_arg;
752d14dc
PE		 2342 unregister_net_sysctl_table(net->ipv4.forw_hdr);
2343 __devinet_sysctl_unregister(net->ipv4.devconf_dflt);
2344 __devinet_sysctl_unregister(net->ipv4.devconf_all);
752d14dc 2345 kfree(tbl);
2a75de0c 2346#endif
752d14dc
PE		 2347 kfree(net->ipv4.devconf_dflt);
2348 kfree(net->ipv4.devconf_all);
2349}
2350
2351static __net_initdata struct pernet_operations devinet_ops = {
2352 .init = devinet_init_net,
2353 .exit = devinet_exit_net,
2354};
2355
207895fd 2356static struct rtnl_af_ops inet_af_ops __read_mostly = {
9f0f7272
TG		 2357 .family = AF_INET,
2358 .fill_link_af = inet_fill_link_af,
2359 .get_link_af_size = inet_get_link_af_size,
cf7afbfe
TG		 2360 .validate_link_af = inet_validate_link_af,
2361 .set_link_af = inet_set_link_af,
9f0f7272
TG		 2362};
2363
1da177e4
LT		 2364void __init devinet_init(void)
2365{
fd23c3b3
DM		 2366 int i;
2367
2368 for (i = 0; i < IN4_ADDR_HSIZE; i++)
2369 INIT_HLIST_HEAD(&inet_addr_lst[i]);
2370
752d14dc
PE		 2371 register_pernet_subsys(&devinet_ops);
2372
1da177e4
LT		 2373 register_gifconf(PF_INET, inet_gifconf);
2374 register_netdevice_notifier(&ip_netdev_notifier);
63f3444f 2375
906e073f 2376 queue_delayed_work(system_power_efficient_wq, &check_lifetime_work, 0);
5c766d64 2377
9f0f7272
TG		 2378 rtnl_af_register(&inet_af_ops);
2379
c7ac8679
GR		 2380 rtnl_register(PF_INET, RTM_NEWADDR, inet_rtm_newaddr, NULL, NULL);
2381 rtnl_register(PF_INET, RTM_DELADDR, inet_rtm_deladdr, NULL, NULL);
2382 rtnl_register(PF_INET, RTM_GETADDR, NULL, inet_dump_ifaddr, NULL);
9e551110 2383 rtnl_register(PF_INET, RTM_GETNETCONF, inet_netconf_get_devconf,
7a674200 2384 inet_netconf_dump_devconf, NULL);
1da177e4
LT		 2385}
2386
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