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cdc: Fix build warning.
[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)
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);
1da177e4
LT		 1197
1198 rcu_read_lock();
e5ed6399 1199 in_dev = __in_dev_get_rcu(dev);
1da177e4
LT		 1200 if (!in_dev)
1201 goto no_in_dev;
1202
1203 for_primary_ifa(in_dev) {
1204 if (ifa->ifa_scope > scope)
1205 continue;
1206 if (!dst || inet_ifa_match(dst, ifa)) {
1207 addr = ifa->ifa_local;
1208 break;
1209 }
1210 if (!addr)
1211 addr = ifa->ifa_local;
1212 } endfor_ifa(in_dev);
1da177e4
LT		 1213
1214 if (addr)
c6d14c84 1215 goto out_unlock;
9f9354b9 1216no_in_dev:
1da177e4
LT		 1217
1218 /* Not loopback addresses on loopback should be preferred
ca9f1fd2 1219 in this case. It is important that lo is the first interface
1da177e4
LT		 1220 in dev_base list.
1221 */
c6d14c84 1222 for_each_netdev_rcu(net, dev) {
9f9354b9
ED		 1223 in_dev = __in_dev_get_rcu(dev);
1224 if (!in_dev)
1da177e4
LT		 1225 continue;
1226
1227 for_primary_ifa(in_dev) {
1228 if (ifa->ifa_scope != RT_SCOPE_LINK &&
1229 ifa->ifa_scope <= scope) {
1230 addr = ifa->ifa_local;
c6d14c84 1231 goto out_unlock;
1da177e4
LT		 1232 }
1233 } endfor_ifa(in_dev);
1234 }
c6d14c84 1235out_unlock:
1da177e4 1236 rcu_read_unlock();
1da177e4
LT		 1237 return addr;
1238}
9f9354b9 1239EXPORT_SYMBOL(inet_select_addr);
1da177e4 1240
60cad5da
AV		 1241static __be32 confirm_addr_indev(struct in_device *in_dev, __be32 dst,
1242 __be32 local, int scope)
1da177e4
LT		 1243{
1244 int same = 0;
a144ea4b 1245 __be32 addr = 0;
1da177e4
LT		 1246
1247 for_ifa(in_dev) {
1248 if (!addr &&
1249 (local == ifa->ifa_local || !local) &&
1250 ifa->ifa_scope <= scope) {
1251 addr = ifa->ifa_local;
1252 if (same)
1253 break;
1254 }
1255 if (!same) {
1256 same = (!local || inet_ifa_match(local, ifa)) &&
1257 (!dst || inet_ifa_match(dst, ifa));
1258 if (same && addr) {
1259 if (local || !dst)
1260 break;
1261 /* Is the selected addr into dst subnet? */
1262 if (inet_ifa_match(addr, ifa))
1263 break;
1264 /* No, then can we use new local src? */
1265 if (ifa->ifa_scope <= scope) {
1266 addr = ifa->ifa_local;
1267 break;
1268 }
1269 /* search for large dst subnet for addr */
1270 same = 0;
1271 }
1272 }
1273 } endfor_ifa(in_dev);
1274
9f9354b9 1275 return same ? addr : 0;
1da177e4
LT		 1276}
1277
1278/*
1279 * Confirm that local IP address exists using wildcards:
b601fa19
ND		 1280 * - net: netns to check, cannot be NULL
1281 * - in_dev: only on this interface, NULL=any interface
1da177e4
LT		 1282 * - dst: only in the same subnet as dst, 0=any dst
1283 * - local: address, 0=autoselect the local address
1284 * - scope: maximum allowed scope value for the local address
1285 */
b601fa19 1286__be32 inet_confirm_addr(struct net *net, struct in_device *in_dev,
9bd85e32 1287 __be32 dst, __be32 local, int scope)
1da177e4 1288{
60cad5da 1289 __be32 addr = 0;
9bd85e32 1290 struct net_device *dev;
1da177e4 1291
00db4124 1292 if (in_dev)
9bd85e32 1293 return confirm_addr_indev(in_dev, dst, local, scope);
1da177e4 1294
1da177e4 1295 rcu_read_lock();
c6d14c84 1296 for_each_netdev_rcu(net, dev) {
9f9354b9
ED		 1297 in_dev = __in_dev_get_rcu(dev);
1298 if (in_dev) {
1da177e4
LT		 1299 addr = confirm_addr_indev(in_dev, dst, local, scope);
1300 if (addr)
1301 break;
1302 }
1303 }
1304 rcu_read_unlock();
1da177e4
LT		 1305
1306 return addr;
1307}
eaddcd76 1308EXPORT_SYMBOL(inet_confirm_addr);
1da177e4
LT		 1309
1310/*
1311 * Device notifier
1312 */
1313
1314int register_inetaddr_notifier(struct notifier_block *nb)
1315{
e041c683 1316 return blocking_notifier_chain_register(&inetaddr_chain, nb);
1da177e4 1317}
9f9354b9 1318EXPORT_SYMBOL(register_inetaddr_notifier);
1da177e4
LT		 1319
1320int unregister_inetaddr_notifier(struct notifier_block *nb)
1321{
e041c683 1322 return blocking_notifier_chain_unregister(&inetaddr_chain, nb);
1da177e4 1323}
9f9354b9 1324EXPORT_SYMBOL(unregister_inetaddr_notifier);
1da177e4 1325
9f9354b9
ED		 1326/* Rename ifa_labels for a device name change. Make some effort to preserve
1327 * existing alias numbering and to create unique labels if possible.
1da177e4
LT		 1328*/
1329static void inetdev_changename(struct net_device *dev, struct in_device *in_dev)
e905a9ed 1330{
1da177e4
LT		 1331 struct in_ifaddr *ifa;
1332 int named = 0;
1333
e905a9ed
YH		 1334 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1335 char old[IFNAMSIZ], *dot;
1da177e4
LT		 1336
1337 memcpy(old, ifa->ifa_label, IFNAMSIZ);
e905a9ed 1338 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1da177e4 1339 if (named++ == 0)
573bf470 1340 goto skip;
44344b2a 1341 dot = strchr(old, ':');
51456b29 1342 if (!dot) {
e905a9ed 1343 sprintf(old, ":%d", named);
1da177e4
LT		 1344 dot = old;
1345 }
9f9354b9 1346 if (strlen(dot) + strlen(dev->name) < IFNAMSIZ)
e905a9ed 1347 strcat(ifa->ifa_label, dot);
9f9354b9 1348 else
e905a9ed 1349 strcpy(ifa->ifa_label + (IFNAMSIZ - strlen(dot) - 1), dot);
573bf470
TG		 1350skip:
1351 rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0);
e905a9ed
YH		 1352 }
1353}
1da177e4 1354
40384999 1355static bool inetdev_valid_mtu(unsigned int mtu)
06770843
BL		 1356{
1357 return mtu >= 68;
1358}
1359
d11327ad
IC		 1360static void inetdev_send_gratuitous_arp(struct net_device *dev,
1361 struct in_device *in_dev)
1362
1363{
b76d0789 1364 struct in_ifaddr *ifa;
d11327ad 1365
b76d0789
ZK		 1366 for (ifa = in_dev->ifa_list; ifa;
1367 ifa = ifa->ifa_next) {
1368 arp_send(ARPOP_REQUEST, ETH_P_ARP,
1369 ifa->ifa_local, dev,
1370 ifa->ifa_local, NULL,
1371 dev->dev_addr, NULL);
1372 }
d11327ad
IC		 1373}
1374
1da177e4
LT		 1375/* Called only under RTNL semaphore */
1376
1377static int inetdev_event(struct notifier_block *this, unsigned long event,
1378 void *ptr)
1379{
351638e7 1380 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
748e2d93 1381 struct in_device *in_dev = __in_dev_get_rtnl(dev);
0115e8e3 1382
1da177e4
LT		 1383 ASSERT_RTNL();
1384
1385 if (!in_dev) {
8030f544 1386 if (event == NETDEV_REGISTER) {
1da177e4 1387 in_dev = inetdev_init(dev);
20e61da7
WC		 1388 if (IS_ERR(in_dev))
1389 return notifier_from_errno(PTR_ERR(in_dev));
0cc217e1 1390 if (dev->flags & IFF_LOOPBACK) {
42f811b8
HX		 1391 IN_DEV_CONF_SET(in_dev, NOXFRM, 1);
1392 IN_DEV_CONF_SET(in_dev, NOPOLICY, 1);
8030f544 1393 }
06770843
BL		 1394 } else if (event == NETDEV_CHANGEMTU) {
1395 /* Re-enabling IP */
1396 if (inetdev_valid_mtu(dev->mtu))
1397 in_dev = inetdev_init(dev);
1da177e4
LT		 1398 }
1399 goto out;
1400 }
1401
1402 switch (event) {
1403 case NETDEV_REGISTER:
91df42be 1404 pr_debug("%s: bug\n", __func__);
a9b3cd7f 1405 RCU_INIT_POINTER(dev->ip_ptr, NULL);
1da177e4
LT		 1406 break;
1407 case NETDEV_UP:
06770843 1408 if (!inetdev_valid_mtu(dev->mtu))
1da177e4 1409 break;
0cc217e1 1410 if (dev->flags & IFF_LOOPBACK) {
9f9354b9
ED		 1411 struct in_ifaddr *ifa = inet_alloc_ifa();
1412
1413 if (ifa) {
fd23c3b3 1414 INIT_HLIST_NODE(&ifa->hash);
1da177e4
LT		 1415 ifa->ifa_local =
1416 ifa->ifa_address = htonl(INADDR_LOOPBACK);
1417 ifa->ifa_prefixlen = 8;
1418 ifa->ifa_mask = inet_make_mask(8);
1419 in_dev_hold(in_dev);
1420 ifa->ifa_dev = in_dev;
1421 ifa->ifa_scope = RT_SCOPE_HOST;
1422 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
5c766d64
JP		 1423 set_ifa_lifetime(ifa, INFINITY_LIFE_TIME,
1424 INFINITY_LIFE_TIME);
dfd1582d
JP		 1425 ipv4_devconf_setall(in_dev);
1426 neigh_parms_data_state_setall(in_dev->arp_parms);
1da177e4
LT		 1427 inet_insert_ifa(ifa);
1428 }
1429 }
1430 ip_mc_up(in_dev);
eefef1cf
SH		 1431 /* fall through */
1432 case NETDEV_CHANGEADDR:
d11327ad
IC		 1433 if (!IN_DEV_ARP_NOTIFY(in_dev))
1434 break;
1435 /* fall through */
1436 case NETDEV_NOTIFY_PEERS:
a21090cf 1437 /* Send gratuitous ARP to notify of link change */
d11327ad 1438 inetdev_send_gratuitous_arp(dev, in_dev);
1da177e4
LT		 1439 break;
1440 case NETDEV_DOWN:
1441 ip_mc_down(in_dev);
1442 break;
93d9b7d7 1443 case NETDEV_PRE_TYPE_CHANGE:
75c78500
MS		 1444 ip_mc_unmap(in_dev);
1445 break;
93d9b7d7 1446 case NETDEV_POST_TYPE_CHANGE:
75c78500
MS		 1447 ip_mc_remap(in_dev);
1448 break;
1da177e4 1449 case NETDEV_CHANGEMTU:
06770843 1450 if (inetdev_valid_mtu(dev->mtu))
1da177e4 1451 break;
06770843 1452 /* disable IP when MTU is not enough */
1da177e4
LT		 1453 case NETDEV_UNREGISTER:
1454 inetdev_destroy(in_dev);
1455 break;
1456 case NETDEV_CHANGENAME:
1457 /* Do not notify about label change, this event is
1458 * not interesting to applications using netlink.
1459 */
1460 inetdev_changename(dev, in_dev);
1461
51602b2a 1462 devinet_sysctl_unregister(in_dev);
66f27a52 1463 devinet_sysctl_register(in_dev);
1da177e4
LT		 1464 break;
1465 }
1466out:
1467 return NOTIFY_DONE;
1468}
1469
1470static struct notifier_block ip_netdev_notifier = {
539afedf 1471 .notifier_call = inetdev_event,
1da177e4
LT		 1472};
1473
40384999 1474static size_t inet_nlmsg_size(void)
339bf98f
TG		 1475{
1476 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
1477 + nla_total_size(4) /* IFA_ADDRESS */
1478 + nla_total_size(4) /* IFA_LOCAL */
1479 + nla_total_size(4) /* IFA_BROADCAST */
ad6c8135 1480 + nla_total_size(IFNAMSIZ) /* IFA_LABEL */
63b5f152
GU		 1481 + nla_total_size(4) /* IFA_FLAGS */
1482 + nla_total_size(sizeof(struct ifa_cacheinfo)); /* IFA_CACHEINFO */
339bf98f
TG		 1483}
1484
5c766d64
JP		 1485static inline u32 cstamp_delta(unsigned long cstamp)
1486{
1487 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
1488}
1489
1490static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
1491 unsigned long tstamp, u32 preferred, u32 valid)
1492{
1493 struct ifa_cacheinfo ci;
1494
1495 ci.cstamp = cstamp_delta(cstamp);
1496 ci.tstamp = cstamp_delta(tstamp);
1497 ci.ifa_prefered = preferred;
1498 ci.ifa_valid = valid;
1499
1500 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
1501}
1502
1da177e4 1503static int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa,
15e47304 1504 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4
LT		 1505{
1506 struct ifaddrmsg *ifm;
1507 struct nlmsghdr *nlh;
5c766d64 1508 u32 preferred, valid;
1da177e4 1509
15e47304 1510 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*ifm), flags);
51456b29 1511 if (!nlh)
26932566 1512 return -EMSGSIZE;
47f68512
TG		 1513
1514 ifm = nlmsg_data(nlh);
1da177e4
LT		 1515 ifm->ifa_family = AF_INET;
1516 ifm->ifa_prefixlen = ifa->ifa_prefixlen;
5c766d64 1517 ifm->ifa_flags = ifa->ifa_flags;
1da177e4
LT		 1518 ifm->ifa_scope = ifa->ifa_scope;
1519 ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
47f68512 1520
5c766d64
JP		 1521 if (!(ifm->ifa_flags & IFA_F_PERMANENT)) {
1522 preferred = ifa->ifa_preferred_lft;
1523 valid = ifa->ifa_valid_lft;
1524 if (preferred != INFINITY_LIFE_TIME) {
1525 long tval = (jiffies - ifa->ifa_tstamp) / HZ;
1526
1527 if (preferred > tval)
1528 preferred -= tval;
1529 else
1530 preferred = 0;
1531 if (valid != INFINITY_LIFE_TIME) {
1532 if (valid > tval)
1533 valid -= tval;
1534 else
1535 valid = 0;
1536 }
1537 }
1538 } else {
1539 preferred = INFINITY_LIFE_TIME;
1540 valid = INFINITY_LIFE_TIME;
1541 }
f3756b79 1542 if ((ifa->ifa_address &&
930345ea 1543 nla_put_in_addr(skb, IFA_ADDRESS, ifa->ifa_address)) ||
f3756b79 1544 (ifa->ifa_local &&
930345ea 1545 nla_put_in_addr(skb, IFA_LOCAL, ifa->ifa_local)) ||
f3756b79 1546 (ifa->ifa_broadcast &&
930345ea 1547 nla_put_in_addr(skb, IFA_BROADCAST, ifa->ifa_broadcast)) ||
f3756b79 1548 (ifa->ifa_label[0] &&
5c766d64 1549 nla_put_string(skb, IFA_LABEL, ifa->ifa_label)) ||
ad6c8135 1550 nla_put_u32(skb, IFA_FLAGS, ifa->ifa_flags) ||
5c766d64
JP		 1551 put_cacheinfo(skb, ifa->ifa_cstamp, ifa->ifa_tstamp,
1552 preferred, valid))
f3756b79 1553 goto nla_put_failure;
1da177e4 1554
053c095a
JB		 1555 nlmsg_end(skb, nlh);
1556 return 0;
47f68512
TG		 1557
1558nla_put_failure:
26932566
PM		 1559 nlmsg_cancel(skb, nlh);
1560 return -EMSGSIZE;
1da177e4
LT		 1561}
1562
1563static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
1564{
3b1e0a65 1565 struct net *net = sock_net(skb->sk);
eec4df98
ED		 1566 int h, s_h;
1567 int idx, s_idx;
1568 int ip_idx, s_ip_idx;
1da177e4
LT		 1569 struct net_device *dev;
1570 struct in_device *in_dev;
1571 struct in_ifaddr *ifa;
eec4df98 1572 struct hlist_head *head;
1da177e4 1573
eec4df98
ED		 1574 s_h = cb->args[0];
1575 s_idx = idx = cb->args[1];
1576 s_ip_idx = ip_idx = cb->args[2];
1577
1578 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1579 idx = 0;
1580 head = &net->dev_index_head[h];
1581 rcu_read_lock();
0465277f
ND		 1582 cb->seq = atomic_read(&net->ipv4.dev_addr_genid) ^
1583 net->dev_base_seq;
b67bfe0d 1584 hlist_for_each_entry_rcu(dev, head, index_hlist) {
eec4df98
ED		 1585 if (idx < s_idx)
1586 goto cont;
4b97efdf 1587 if (h > s_h || idx > s_idx)
eec4df98
ED		 1588 s_ip_idx = 0;
1589 in_dev = __in_dev_get_rcu(dev);
1590 if (!in_dev)
1591 goto cont;
1da177e4 1592
eec4df98
ED		 1593 for (ifa = in_dev->ifa_list, ip_idx = 0; ifa;
1594 ifa = ifa->ifa_next, ip_idx++) {
1595 if (ip_idx < s_ip_idx)
1596 continue;
1597 if (inet_fill_ifaddr(skb, ifa,
15e47304 1598 NETLINK_CB(cb->skb).portid,
1da177e4 1599 cb->nlh->nlmsg_seq,
053c095a 1600 RTM_NEWADDR, NLM_F_MULTI) < 0) {
eec4df98
ED		 1601 rcu_read_unlock();
1602 goto done;
1603 }
0465277f 1604 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
eec4df98 1605 }
7562f876 1606cont:
eec4df98
ED		 1607 idx++;
1608 }
1609 rcu_read_unlock();
1da177e4
LT		 1610 }
1611
1612done:
eec4df98
ED		 1613 cb->args[0] = h;
1614 cb->args[1] = idx;
1615 cb->args[2] = ip_idx;
1da177e4
LT		 1616
1617 return skb->len;
1618}
1619
539afedf 1620static void rtmsg_ifa(int event, struct in_ifaddr *ifa, struct nlmsghdr *nlh,
15e47304 1621 u32 portid)
1da177e4 1622{
47f68512 1623 struct sk_buff *skb;
d6062cbb
TG		 1624 u32 seq = nlh ? nlh->nlmsg_seq : 0;
1625 int err = -ENOBUFS;
4b8aa9ab 1626 struct net *net;
1da177e4 1627
c346dca1 1628 net = dev_net(ifa->ifa_dev->dev);
339bf98f 1629 skb = nlmsg_new(inet_nlmsg_size(), GFP_KERNEL);
51456b29 1630 if (!skb)
d6062cbb
TG		 1631 goto errout;
1632
15e47304 1633 err = inet_fill_ifaddr(skb, ifa, portid, seq, event, 0);
26932566
PM		 1634 if (err < 0) {
1635 /* -EMSGSIZE implies BUG in inet_nlmsg_size() */
1636 WARN_ON(err == -EMSGSIZE);
1637 kfree_skb(skb);
1638 goto errout;
1639 }
15e47304 1640 rtnl_notify(skb, net, portid, RTNLGRP_IPV4_IFADDR, nlh, GFP_KERNEL);
1ce85fe4 1641 return;
d6062cbb
TG		 1642errout:
1643 if (err < 0)
4b8aa9ab 1644 rtnl_set_sk_err(net, RTNLGRP_IPV4_IFADDR, err);
1da177e4
LT		 1645}
1646
9f0f7272
TG		 1647static size_t inet_get_link_af_size(const struct net_device *dev)
1648{
1fc19aff 1649 struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr);
9f0f7272
TG		 1650
1651 if (!in_dev)
1652 return 0;
1653
1654 return nla_total_size(IPV4_DEVCONF_MAX * 4); /* IFLA_INET_CONF */
1655}
1656
1657static int inet_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
1658{
1fc19aff 1659 struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr);
9f0f7272
TG		 1660 struct nlattr *nla;
1661 int i;
1662
1663 if (!in_dev)
1664 return -ENODATA;
1665
1666 nla = nla_reserve(skb, IFLA_INET_CONF, IPV4_DEVCONF_MAX * 4);
51456b29 1667 if (!nla)
9f0f7272
TG		 1668 return -EMSGSIZE;
1669
1670 for (i = 0; i < IPV4_DEVCONF_MAX; i++)
1671 ((u32 *) nla_data(nla))[i] = in_dev->cnf.data[i];
1672
1673 return 0;
1674}
1675
1676static const struct nla_policy inet_af_policy[IFLA_INET_MAX+1] = {
1677 [IFLA_INET_CONF] = { .type = NLA_NESTED },
1678};
1679
cf7afbfe
TG		 1680static int inet_validate_link_af(const struct net_device *dev,
1681 const struct nlattr *nla)
9f0f7272 1682{
9f0f7272
TG		 1683 struct nlattr *a, *tb[IFLA_INET_MAX+1];
1684 int err, rem;
1685
f7fce74e 1686 if (dev && !__in_dev_get_rtnl(dev))
cf7afbfe 1687 return -EAFNOSUPPORT;
9f0f7272
TG		 1688
1689 err = nla_parse_nested(tb, IFLA_INET_MAX, nla, inet_af_policy);
1690 if (err < 0)
1691 return err;
1692
1693 if (tb[IFLA_INET_CONF]) {
1694 nla_for_each_nested(a, tb[IFLA_INET_CONF], rem) {
1695 int cfgid = nla_type(a);
1696
1697 if (nla_len(a) < 4)
1698 return -EINVAL;
1699
1700 if (cfgid <= 0 || cfgid > IPV4_DEVCONF_MAX)
1701 return -EINVAL;
1702 }
1703 }
1704
cf7afbfe
TG		 1705 return 0;
1706}
1707
1708static int inet_set_link_af(struct net_device *dev, const struct nlattr *nla)
1709{
f7fce74e 1710 struct in_device *in_dev = __in_dev_get_rtnl(dev);
cf7afbfe
TG		 1711 struct nlattr *a, *tb[IFLA_INET_MAX+1];
1712 int rem;
1713
1714 if (!in_dev)
1715 return -EAFNOSUPPORT;
1716
1717 if (nla_parse_nested(tb, IFLA_INET_MAX, nla, NULL) < 0)
1718 BUG();
1719
9f0f7272
TG		 1720 if (tb[IFLA_INET_CONF]) {
1721 nla_for_each_nested(a, tb[IFLA_INET_CONF], rem)
1722 ipv4_devconf_set(in_dev, nla_type(a), nla_get_u32(a));
1723 }
1724
1725 return 0;
1726}
1727
edc9e748
ND		 1728static int inet_netconf_msgsize_devconf(int type)
1729{
1730 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
1731 + nla_total_size(4); /* NETCONFA_IFINDEX */
1732
9e551110
ND		 1733 /* type -1 is used for ALL */
1734 if (type == -1 || type == NETCONFA_FORWARDING)
edc9e748 1735 size += nla_total_size(4);
cc535dfb
ND		 1736 if (type == -1 || type == NETCONFA_RP_FILTER)
1737 size += nla_total_size(4);
d67b8c61
ND		 1738 if (type == -1 || type == NETCONFA_MC_FORWARDING)
1739 size += nla_total_size(4);
09aea5df 1740 if (type == -1 || type == NETCONFA_PROXY_NEIGH)
f085ff1c 1741 size += nla_total_size(4);
974d7af5
AG		 1742 if (type == -1 || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
1743 size += nla_total_size(4);
edc9e748
ND		 1744
1745 return size;
1746}
1747
1748static int inet_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
1749 struct ipv4_devconf *devconf, u32 portid,
1750 u32 seq, int event, unsigned int flags,
1751 int type)
1752{
1753 struct nlmsghdr *nlh;
1754 struct netconfmsg *ncm;
1755
1756 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
1757 flags);
51456b29 1758 if (!nlh)
edc9e748
ND		 1759 return -EMSGSIZE;
1760
1761 ncm = nlmsg_data(nlh);
1762 ncm->ncm_family = AF_INET;
1763
1764 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
1765 goto nla_put_failure;
1766
9e551110
ND		 1767 /* type -1 is used for ALL */
1768 if ((type == -1 || type == NETCONFA_FORWARDING) &&
edc9e748
ND		 1769 nla_put_s32(skb, NETCONFA_FORWARDING,
1770 IPV4_DEVCONF(*devconf, FORWARDING)) < 0)
1771 goto nla_put_failure;
cc535dfb
ND		 1772 if ((type == -1 || type == NETCONFA_RP_FILTER) &&
1773 nla_put_s32(skb, NETCONFA_RP_FILTER,
1774 IPV4_DEVCONF(*devconf, RP_FILTER)) < 0)
1775 goto nla_put_failure;
d67b8c61
ND		 1776 if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
1777 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
1778 IPV4_DEVCONF(*devconf, MC_FORWARDING)) < 0)
1779 goto nla_put_failure;
09aea5df 1780 if ((type == -1 || type == NETCONFA_PROXY_NEIGH) &&
1781 nla_put_s32(skb, NETCONFA_PROXY_NEIGH,
f085ff1c 1782 IPV4_DEVCONF(*devconf, PROXY_ARP)) < 0)
1783 goto nla_put_failure;
974d7af5
AG		 1784 if ((type == -1 || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
1785 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
1786 IPV4_DEVCONF(*devconf, IGNORE_ROUTES_WITH_LINKDOWN)) < 0)
1787 goto nla_put_failure;
edc9e748 1788
053c095a
JB		 1789 nlmsg_end(skb, nlh);
1790 return 0;
edc9e748
ND		 1791
1792nla_put_failure:
1793 nlmsg_cancel(skb, nlh);
1794 return -EMSGSIZE;
1795}
1796
d67b8c61
ND		 1797void inet_netconf_notify_devconf(struct net *net, int type, int ifindex,
1798 struct ipv4_devconf *devconf)
edc9e748
ND		 1799{
1800 struct sk_buff *skb;
1801 int err = -ENOBUFS;
1802
1803 skb = nlmsg_new(inet_netconf_msgsize_devconf(type), GFP_ATOMIC);
51456b29 1804 if (!skb)
edc9e748
ND		 1805 goto errout;
1806
1807 err = inet_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
1808 RTM_NEWNETCONF, 0, type);
1809 if (err < 0) {
1810 /* -EMSGSIZE implies BUG in inet_netconf_msgsize_devconf() */
1811 WARN_ON(err == -EMSGSIZE);
1812 kfree_skb(skb);
1813 goto errout;
1814 }
1815 rtnl_notify(skb, net, 0, RTNLGRP_IPV4_NETCONF, NULL, GFP_ATOMIC);
1816 return;
1817errout:
1818 if (err < 0)
1819 rtnl_set_sk_err(net, RTNLGRP_IPV4_NETCONF, err);
1820}
1821
9e551110
ND		 1822static const struct nla_policy devconf_ipv4_policy[NETCONFA_MAX+1] = {
1823 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
1824 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
cc535dfb 1825 [NETCONFA_RP_FILTER] = { .len = sizeof(int) },
09aea5df 1826 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
974d7af5 1827 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
9e551110
ND		 1828};
1829
1830static int inet_netconf_get_devconf(struct sk_buff *in_skb,
661d2967 1831 struct nlmsghdr *nlh)
9e551110
ND		 1832{
1833 struct net *net = sock_net(in_skb->sk);
1834 struct nlattr *tb[NETCONFA_MAX+1];
1835 struct netconfmsg *ncm;
1836 struct sk_buff *skb;
1837 struct ipv4_devconf *devconf;
1838 struct in_device *in_dev;
1839 struct net_device *dev;
1840 int ifindex;
1841 int err;
1842
1843 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
1844 devconf_ipv4_policy);
1845 if (err < 0)
1846 goto errout;
1847
1848 err = EINVAL;
1849 if (!tb[NETCONFA_IFINDEX])
1850 goto errout;
1851
1852 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
1853 switch (ifindex) {
1854 case NETCONFA_IFINDEX_ALL:
1855 devconf = net->ipv4.devconf_all;
1856 break;
1857 case NETCONFA_IFINDEX_DEFAULT:
1858 devconf = net->ipv4.devconf_dflt;
1859 break;
1860 default:
1861 dev = __dev_get_by_index(net, ifindex);
51456b29 1862 if (!dev)
9e551110
ND		 1863 goto errout;
1864 in_dev = __in_dev_get_rtnl(dev);
51456b29 1865 if (!in_dev)
9e551110
ND		 1866 goto errout;
1867 devconf = &in_dev->cnf;
1868 break;
1869 }
1870
1871 err = -ENOBUFS;
1872 skb = nlmsg_new(inet_netconf_msgsize_devconf(-1), GFP_ATOMIC);
51456b29 1873 if (!skb)
9e551110
ND		 1874 goto errout;
1875
1876 err = inet_netconf_fill_devconf(skb, ifindex, devconf,
1877 NETLINK_CB(in_skb).portid,
1878 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
1879 -1);
1880 if (err < 0) {
1881 /* -EMSGSIZE implies BUG in inet_netconf_msgsize_devconf() */
1882 WARN_ON(err == -EMSGSIZE);
1883 kfree_skb(skb);
1884 goto errout;
1885 }
1886 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
1887errout:
1888 return err;
1889}
1890
7a674200
ND		 1891static int inet_netconf_dump_devconf(struct sk_buff *skb,
1892 struct netlink_callback *cb)
1893{
1894 struct net *net = sock_net(skb->sk);
1895 int h, s_h;
1896 int idx, s_idx;
1897 struct net_device *dev;
1898 struct in_device *in_dev;
1899 struct hlist_head *head;
1900
1901 s_h = cb->args[0];
1902 s_idx = idx = cb->args[1];
1903
1904 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1905 idx = 0;
1906 head = &net->dev_index_head[h];
1907 rcu_read_lock();
0465277f
ND		 1908 cb->seq = atomic_read(&net->ipv4.dev_addr_genid) ^
1909 net->dev_base_seq;
7a674200
ND		 1910 hlist_for_each_entry_rcu(dev, head, index_hlist) {
1911 if (idx < s_idx)
1912 goto cont;
1913 in_dev = __in_dev_get_rcu(dev);
1914 if (!in_dev)
1915 goto cont;
1916
1917 if (inet_netconf_fill_devconf(skb, dev->ifindex,
1918 &in_dev->cnf,
1919 NETLINK_CB(cb->skb).portid,
1920 cb->nlh->nlmsg_seq,
1921 RTM_NEWNETCONF,
1922 NLM_F_MULTI,
7b46a644 1923 -1) < 0) {
7a674200
ND		 1924 rcu_read_unlock();
1925 goto done;
1926 }
0465277f 1927 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7a674200
ND		 1928cont:
1929 idx++;
1930 }
1931 rcu_read_unlock();
1932 }
1933 if (h == NETDEV_HASHENTRIES) {
1934 if (inet_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
1935 net->ipv4.devconf_all,
1936 NETLINK_CB(cb->skb).portid,
1937 cb->nlh->nlmsg_seq,
1938 RTM_NEWNETCONF, NLM_F_MULTI,
7b46a644 1939 -1) < 0)
7a674200
ND		 1940 goto done;
1941 else
1942 h++;
1943 }
1944 if (h == NETDEV_HASHENTRIES + 1) {
1945 if (inet_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
1946 net->ipv4.devconf_dflt,
1947 NETLINK_CB(cb->skb).portid,
1948 cb->nlh->nlmsg_seq,
1949 RTM_NEWNETCONF, NLM_F_MULTI,
7b46a644 1950 -1) < 0)
7a674200
ND		 1951 goto done;
1952 else
1953 h++;
1954 }
1955done:
1956 cb->args[0] = h;
1957 cb->args[1] = idx;
1958
1959 return skb->len;
1960}
1961
1da177e4
LT		 1962#ifdef CONFIG_SYSCTL
1963
c0ce9fb3 1964static void devinet_copy_dflt_conf(struct net *net, int i)
31be3085
HX		 1965{
1966 struct net_device *dev;
1967
c6d14c84
ED		 1968 rcu_read_lock();
1969 for_each_netdev_rcu(net, dev) {
31be3085 1970 struct in_device *in_dev;
c6d14c84 1971
31be3085
HX		 1972 in_dev = __in_dev_get_rcu(dev);
1973 if (in_dev && !test_bit(i, in_dev->cnf.state))
9355bbd6 1974 in_dev->cnf.data[i] = net->ipv4.devconf_dflt->data[i];
31be3085 1975 }
c6d14c84 1976 rcu_read_unlock();
31be3085
HX		 1977}
1978
c6d14c84 1979/* called with RTNL locked */
c0ce9fb3 1980static void inet_forward_change(struct net *net)
68dd299b
PE		 1981{
1982 struct net_device *dev;
586f1211 1983 int on = IPV4_DEVCONF_ALL(net, FORWARDING);
68dd299b 1984
586f1211 1985 IPV4_DEVCONF_ALL(net, ACCEPT_REDIRECTS) = !on;
9355bbd6 1986 IPV4_DEVCONF_DFLT(net, FORWARDING) = on;
edc9e748
ND		 1987 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING,
1988 NETCONFA_IFINDEX_ALL,
1989 net->ipv4.devconf_all);
1990 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING,
1991 NETCONFA_IFINDEX_DEFAULT,
1992 net->ipv4.devconf_dflt);
68dd299b 1993
c0ce9fb3 1994 for_each_netdev(net, dev) {
68dd299b 1995 struct in_device *in_dev;
0187bdfb
BH		 1996 if (on)
1997 dev_disable_lro(dev);
68dd299b
PE		 1998 rcu_read_lock();
1999 in_dev = __in_dev_get_rcu(dev);
edc9e748 2000 if (in_dev) {
68dd299b 2001 IN_DEV_CONF_SET(in_dev, FORWARDING, on);
edc9e748
ND		 2002 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING,
2003 dev->ifindex, &in_dev->cnf);
2004 }
68dd299b
PE		 2005 rcu_read_unlock();
2006 }
68dd299b
PE		 2007}
2008
f085ff1c 2009static int devinet_conf_ifindex(struct net *net, struct ipv4_devconf *cnf)
2010{
2011 if (cnf == net->ipv4.devconf_dflt)
2012 return NETCONFA_IFINDEX_DEFAULT;
2013 else if (cnf == net->ipv4.devconf_all)
2014 return NETCONFA_IFINDEX_ALL;
2015 else {
2016 struct in_device *idev
2017 = container_of(cnf, struct in_device, cnf);
2018 return idev->dev->ifindex;
2019 }
2020}
2021
fe2c6338 2022static int devinet_conf_proc(struct ctl_table *ctl, int write,
8d65af78 2023 void __user *buffer,
31be3085
HX		 2024 size_t *lenp, loff_t *ppos)
2025{
d01ff0a0 2026 int old_value = *(int *)ctl->data;
8d65af78 2027 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
d01ff0a0 2028 int new_value = *(int *)ctl->data;
31be3085
HX		 2029
2030 if (write) {
2031 struct ipv4_devconf *cnf = ctl->extra1;
c0ce9fb3 2032 struct net *net = ctl->extra2;
31be3085 2033 int i = (int *)ctl->data - cnf->data;
f085ff1c 2034 int ifindex;
31be3085
HX		 2035
2036 set_bit(i, cnf->state);
2037
9355bbd6 2038 if (cnf == net->ipv4.devconf_dflt)
c0ce9fb3 2039 devinet_copy_dflt_conf(net, i);
d0daebc3
TG		 2040 if (i == IPV4_DEVCONF_ACCEPT_LOCAL - 1 ||
2041 i == IPV4_DEVCONF_ROUTE_LOCALNET - 1)
d01ff0a0 2042 if ((new_value == 0) && (old_value != 0))
4ccfe6d4 2043 rt_cache_flush(net);
f085ff1c 2044
cc535dfb
ND		 2045 if (i == IPV4_DEVCONF_RP_FILTER - 1 &&
2046 new_value != old_value) {
f085ff1c 2047 ifindex = devinet_conf_ifindex(net, cnf);
cc535dfb
ND		 2048 inet_netconf_notify_devconf(net, NETCONFA_RP_FILTER,
2049 ifindex, cnf);
2050 }
f085ff1c 2051 if (i == IPV4_DEVCONF_PROXY_ARP - 1 &&
2052 new_value != old_value) {
2053 ifindex = devinet_conf_ifindex(net, cnf);
09aea5df 2054 inet_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
f085ff1c 2055 ifindex, cnf);
2056 }
974d7af5
AG		 2057 if (i == IPV4_DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN - 1 &&
2058 new_value != old_value) {
2059 ifindex = devinet_conf_ifindex(net, cnf);
2060 inet_netconf_notify_devconf(net, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
2061 ifindex, cnf);
2062 }
31be3085
HX		 2063 }
2064
2065 return ret;
2066}
2067
fe2c6338 2068static int devinet_sysctl_forward(struct ctl_table *ctl, int write,
8d65af78 2069 void __user *buffer,
1da177e4
LT		 2070 size_t *lenp, loff_t *ppos)
2071{
2072 int *valp = ctl->data;
2073 int val = *valp;
88af182e 2074 loff_t pos = *ppos;
8d65af78 2075 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
1da177e4
LT		 2076
2077 if (write && *valp != val) {
c0ce9fb3
PE		 2078 struct net *net = ctl->extra2;
2079
0187bdfb 2080 if (valp != &IPV4_DEVCONF_DFLT(net, FORWARDING)) {
88af182e
EB		 2081 if (!rtnl_trylock()) {
2082 /* Restore the original values before restarting */
2083 *valp = val;
2084 *ppos = pos;
9b8adb5e 2085 return restart_syscall();
88af182e 2086 }
0187bdfb
BH		 2087 if (valp == &IPV4_DEVCONF_ALL(net, FORWARDING)) {
2088 inet_forward_change(net);
edc9e748 2089 } else {
0187bdfb
BH		 2090 struct ipv4_devconf *cnf = ctl->extra1;
2091 struct in_device *idev =
2092 container_of(cnf, struct in_device, cnf);
edc9e748
ND		 2093 if (*valp)
2094 dev_disable_lro(idev->dev);
2095 inet_netconf_notify_devconf(net,
2096 NETCONFA_FORWARDING,
2097 idev->dev->ifindex,
2098 cnf);
0187bdfb
BH		 2099 }
2100 rtnl_unlock();
4ccfe6d4 2101 rt_cache_flush(net);
edc9e748
ND		 2102 } else
2103 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING,
2104 NETCONFA_IFINDEX_DEFAULT,
2105 net->ipv4.devconf_dflt);
1da177e4
LT		 2106 }
2107
2108 return ret;
2109}
2110
fe2c6338 2111static int ipv4_doint_and_flush(struct ctl_table *ctl, int write,
323e126f
DM		 2112 void __user *buffer,
2113 size_t *lenp, loff_t *ppos)
1da177e4
LT		 2114{
2115 int *valp = ctl->data;
2116 int val = *valp;
8d65af78 2117 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
76e6ebfb 2118 struct net *net = ctl->extra2;
1da177e4
LT		 2119
2120 if (write && *valp != val)
4ccfe6d4 2121 rt_cache_flush(net);
1da177e4
LT		 2122
2123 return ret;
2124}
2125
f8572d8f 2126#define DEVINET_SYSCTL_ENTRY(attr, name, mval, proc) \
42f811b8 2127 { \
42f811b8
HX		 2128 .procname = name, \
2129 .data = ipv4_devconf.data + \
02291680 2130 IPV4_DEVCONF_ ## attr - 1, \
42f811b8
HX		 2131 .maxlen = sizeof(int), \
2132 .mode = mval, \
2133 .proc_handler = proc, \
31be3085 2134 .extra1 = &ipv4_devconf, \
42f811b8
HX		 2135 }
2136
2137#define DEVINET_SYSCTL_RW_ENTRY(attr, name) \
f8572d8f 2138 DEVINET_SYSCTL_ENTRY(attr, name, 0644, devinet_conf_proc)
42f811b8
HX		 2139
2140#define DEVINET_SYSCTL_RO_ENTRY(attr, name) \
f8572d8f 2141 DEVINET_SYSCTL_ENTRY(attr, name, 0444, devinet_conf_proc)
42f811b8 2142
f8572d8f
EB		 2143#define DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, proc) \
2144 DEVINET_SYSCTL_ENTRY(attr, name, 0644, proc)
42f811b8
HX		 2145
2146#define DEVINET_SYSCTL_FLUSHING_ENTRY(attr, name) \
f8572d8f 2147 DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, ipv4_doint_and_flush)
42f811b8 2148
1da177e4
LT		 2149static struct devinet_sysctl_table {
2150 struct ctl_table_header *sysctl_header;
02291680 2151 struct ctl_table devinet_vars[__IPV4_DEVCONF_MAX];
1da177e4
LT		 2152} devinet_sysctl = {
2153 .devinet_vars = {
42f811b8 2154 DEVINET_SYSCTL_COMPLEX_ENTRY(FORWARDING, "forwarding",
f8572d8f 2155 devinet_sysctl_forward),
42f811b8
HX		 2156 DEVINET_SYSCTL_RO_ENTRY(MC_FORWARDING, "mc_forwarding"),
2157
2158 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_REDIRECTS, "accept_redirects"),
2159 DEVINET_SYSCTL_RW_ENTRY(SECURE_REDIRECTS, "secure_redirects"),
2160 DEVINET_SYSCTL_RW_ENTRY(SHARED_MEDIA, "shared_media"),
2161 DEVINET_SYSCTL_RW_ENTRY(RP_FILTER, "rp_filter"),
2162 DEVINET_SYSCTL_RW_ENTRY(SEND_REDIRECTS, "send_redirects"),
2163 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_SOURCE_ROUTE,
2164 "accept_source_route"),
8153a10c 2165 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_LOCAL, "accept_local"),
28f6aeea 2166 DEVINET_SYSCTL_RW_ENTRY(SRC_VMARK, "src_valid_mark"),
42f811b8
HX		 2167 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP, "proxy_arp"),
2168 DEVINET_SYSCTL_RW_ENTRY(MEDIUM_ID, "medium_id"),
2169 DEVINET_SYSCTL_RW_ENTRY(BOOTP_RELAY, "bootp_relay"),
2170 DEVINET_SYSCTL_RW_ENTRY(LOG_MARTIANS, "log_martians"),
2171 DEVINET_SYSCTL_RW_ENTRY(TAG, "tag"),
2172 DEVINET_SYSCTL_RW_ENTRY(ARPFILTER, "arp_filter"),
2173 DEVINET_SYSCTL_RW_ENTRY(ARP_ANNOUNCE, "arp_announce"),
2174 DEVINET_SYSCTL_RW_ENTRY(ARP_IGNORE, "arp_ignore"),
2175 DEVINET_SYSCTL_RW_ENTRY(ARP_ACCEPT, "arp_accept"),
eefef1cf 2176 DEVINET_SYSCTL_RW_ENTRY(ARP_NOTIFY, "arp_notify"),
65324144 2177 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP_PVLAN, "proxy_arp_pvlan"),
5c6fe01c
WM		 2178 DEVINET_SYSCTL_RW_ENTRY(FORCE_IGMP_VERSION,
2179 "force_igmp_version"),
2690048c
WM		 2180 DEVINET_SYSCTL_RW_ENTRY(IGMPV2_UNSOLICITED_REPORT_INTERVAL,
2181 "igmpv2_unsolicited_report_interval"),
2182 DEVINET_SYSCTL_RW_ENTRY(IGMPV3_UNSOLICITED_REPORT_INTERVAL,
2183 "igmpv3_unsolicited_report_interval"),
0eeb075f
AG		 2184 DEVINET_SYSCTL_RW_ENTRY(IGNORE_ROUTES_WITH_LINKDOWN,
2185 "ignore_routes_with_linkdown"),
42f811b8
HX		 2186
2187 DEVINET_SYSCTL_FLUSHING_ENTRY(NOXFRM, "disable_xfrm"),
2188 DEVINET_SYSCTL_FLUSHING_ENTRY(NOPOLICY, "disable_policy"),
42f811b8
HX		 2189 DEVINET_SYSCTL_FLUSHING_ENTRY(PROMOTE_SECONDARIES,
2190 "promote_secondaries"),
d0daebc3
TG		 2191 DEVINET_SYSCTL_FLUSHING_ENTRY(ROUTE_LOCALNET,
2192 "route_localnet"),
1da177e4 2193 },
1da177e4
LT		 2194};
2195
ea40b324 2196static int __devinet_sysctl_register(struct net *net, char *dev_name,
f8572d8f 2197 struct ipv4_devconf *p)
1da177e4
LT		 2198{
2199 int i;
9fa89642 2200 struct devinet_sysctl_table *t;
8607ddb8 2201 char path[sizeof("net/ipv4/conf/") + IFNAMSIZ];
bfada697 2202
9fa89642 2203 t = kmemdup(&devinet_sysctl, sizeof(*t), GFP_KERNEL);
1da177e4 2204 if (!t)
9fa89642
PE		 2205 goto out;
2206
1da177e4
LT		 2207 for (i = 0; i < ARRAY_SIZE(t->devinet_vars) - 1; i++) {
2208 t->devinet_vars[i].data += (char *)p - (char *)&ipv4_devconf;
31be3085 2209 t->devinet_vars[i].extra1 = p;
c0ce9fb3 2210 t->devinet_vars[i].extra2 = net;
1da177e4
LT		 2211 }
2212
8607ddb8 2213 snprintf(path, sizeof(path), "net/ipv4/conf/%s", dev_name);
1da177e4 2214
8607ddb8 2215 t->sysctl_header = register_net_sysctl(net, path, t->devinet_vars);
1da177e4 2216 if (!t->sysctl_header)
8607ddb8 2217 goto free;
1da177e4
LT		 2218
2219 p->sysctl = t;
ea40b324 2220 return 0;
1da177e4 2221
9fa89642 2222free:
1da177e4 2223 kfree(t);
9fa89642 2224out:
ea40b324 2225 return -ENOBUFS;
1da177e4
LT		 2226}
2227
51602b2a
PE		 2228static void __devinet_sysctl_unregister(struct ipv4_devconf *cnf)
2229{
2230 struct devinet_sysctl_table *t = cnf->sysctl;
2231
51456b29 2232 if (!t)
51602b2a
PE		 2233 return;
2234
2235 cnf->sysctl = NULL;
ff538818 2236 unregister_net_sysctl_table(t->sysctl_header);
51602b2a
PE		 2237 kfree(t);
2238}
2239
20e61da7 2240static int devinet_sysctl_register(struct in_device *idev)
66f27a52 2241{
20e61da7
WC		 2242 int err;
2243
2244 if (!sysctl_dev_name_is_allowed(idev->dev->name))
2245 return -EINVAL;
2246
2247 err = neigh_sysctl_register(idev->dev, idev->arp_parms, NULL);
2248 if (err)
2249 return err;
2250 err = __devinet_sysctl_register(dev_net(idev->dev), idev->dev->name,
f8572d8f 2251 &idev->cnf);
20e61da7
WC		 2252 if (err)
2253 neigh_sysctl_unregister(idev->arp_parms);
2254 return err;
66f27a52
PE		 2255}
2256
51602b2a 2257static void devinet_sysctl_unregister(struct in_device *idev)
1da177e4 2258{
51602b2a
PE		 2259 __devinet_sysctl_unregister(&idev->cnf);
2260 neigh_sysctl_unregister(idev->arp_parms);
1da177e4 2261}
1da177e4 2262
68dd299b
PE		 2263static struct ctl_table ctl_forward_entry[] = {
2264 {
68dd299b
PE		 2265 .procname = "ip_forward",
2266 .data = &ipv4_devconf.data[
02291680 2267 IPV4_DEVCONF_FORWARDING - 1],
68dd299b
PE		 2268 .maxlen = sizeof(int),
2269 .mode = 0644,
2270 .proc_handler = devinet_sysctl_forward,
68dd299b 2271 .extra1 = &ipv4_devconf,
c0ce9fb3 2272 .extra2 = &init_net,
68dd299b
PE		 2273 },
2274 { },
2275};
2a75de0c 2276#endif
68dd299b 2277
752d14dc
PE		 2278static __net_init int devinet_init_net(struct net *net)
2279{
2280 int err;
752d14dc 2281 struct ipv4_devconf *all, *dflt;
2a75de0c
ED		 2282#ifdef CONFIG_SYSCTL
2283 struct ctl_table *tbl = ctl_forward_entry;
752d14dc 2284 struct ctl_table_header *forw_hdr;
2a75de0c 2285#endif
752d14dc
PE		 2286
2287 err = -ENOMEM;
2288 all = &ipv4_devconf;
2289 dflt = &ipv4_devconf_dflt;
752d14dc 2290
09ad9bc7 2291 if (!net_eq(net, &init_net)) {
752d14dc 2292 all = kmemdup(all, sizeof(ipv4_devconf), GFP_KERNEL);
51456b29 2293 if (!all)
752d14dc
PE		 2294 goto err_alloc_all;
2295
2296 dflt = kmemdup(dflt, sizeof(ipv4_devconf_dflt), GFP_KERNEL);
51456b29 2297 if (!dflt)
752d14dc
PE		 2298 goto err_alloc_dflt;
2299
2a75de0c 2300#ifdef CONFIG_SYSCTL
752d14dc 2301 tbl = kmemdup(tbl, sizeof(ctl_forward_entry), GFP_KERNEL);
51456b29 2302 if (!tbl)
752d14dc
PE		 2303 goto err_alloc_ctl;
2304
02291680 2305 tbl[0].data = &all->data[IPV4_DEVCONF_FORWARDING - 1];
752d14dc
PE		 2306 tbl[0].extra1 = all;
2307 tbl[0].extra2 = net;
2a75de0c 2308#endif
752d14dc
PE		 2309 }
2310
2311#ifdef CONFIG_SYSCTL
f8572d8f 2312 err = __devinet_sysctl_register(net, "all", all);
752d14dc
PE		 2313 if (err < 0)
2314 goto err_reg_all;
2315
f8572d8f 2316 err = __devinet_sysctl_register(net, "default", dflt);
752d14dc
PE		 2317 if (err < 0)
2318 goto err_reg_dflt;
2319
2320 err = -ENOMEM;
8607ddb8 2321 forw_hdr = register_net_sysctl(net, "net/ipv4", tbl);
51456b29 2322 if (!forw_hdr)
752d14dc 2323 goto err_reg_ctl;
2a75de0c 2324 net->ipv4.forw_hdr = forw_hdr;
752d14dc
PE		 2325#endif
2326
752d14dc
PE		 2327 net->ipv4.devconf_all = all;
2328 net->ipv4.devconf_dflt = dflt;
2329 return 0;
2330
2331#ifdef CONFIG_SYSCTL
2332err_reg_ctl:
2333 __devinet_sysctl_unregister(dflt);
2334err_reg_dflt:
2335 __devinet_sysctl_unregister(all);
2336err_reg_all:
2337 if (tbl != ctl_forward_entry)
2338 kfree(tbl);
752d14dc 2339err_alloc_ctl:
2a75de0c 2340#endif
752d14dc
PE		 2341 if (dflt != &ipv4_devconf_dflt)
2342 kfree(dflt);
2343err_alloc_dflt:
2344 if (all != &ipv4_devconf)
2345 kfree(all);
2346err_alloc_all:
2347 return err;
2348}
2349
2350static __net_exit void devinet_exit_net(struct net *net)
2351{
2a75de0c 2352#ifdef CONFIG_SYSCTL
752d14dc
PE		 2353 struct ctl_table *tbl;
2354
2355 tbl = net->ipv4.forw_hdr->ctl_table_arg;
752d14dc
PE		 2356 unregister_net_sysctl_table(net->ipv4.forw_hdr);
2357 __devinet_sysctl_unregister(net->ipv4.devconf_dflt);
2358 __devinet_sysctl_unregister(net->ipv4.devconf_all);
752d14dc 2359 kfree(tbl);
2a75de0c 2360#endif
752d14dc
PE		 2361 kfree(net->ipv4.devconf_dflt);
2362 kfree(net->ipv4.devconf_all);
2363}
2364
2365static __net_initdata struct pernet_operations devinet_ops = {
2366 .init = devinet_init_net,
2367 .exit = devinet_exit_net,
2368};
2369
207895fd 2370static struct rtnl_af_ops inet_af_ops __read_mostly = {
9f0f7272
TG		 2371 .family = AF_INET,
2372 .fill_link_af = inet_fill_link_af,
2373 .get_link_af_size = inet_get_link_af_size,
cf7afbfe
TG		 2374 .validate_link_af = inet_validate_link_af,
2375 .set_link_af = inet_set_link_af,
9f0f7272
TG		 2376};
2377
1da177e4
LT		 2378void __init devinet_init(void)
2379{
fd23c3b3
DM		 2380 int i;
2381
2382 for (i = 0; i < IN4_ADDR_HSIZE; i++)
2383 INIT_HLIST_HEAD(&inet_addr_lst[i]);
2384
752d14dc
PE		 2385 register_pernet_subsys(&devinet_ops);
2386
1da177e4
LT		 2387 register_gifconf(PF_INET, inet_gifconf);
2388 register_netdevice_notifier(&ip_netdev_notifier);
63f3444f 2389
906e073f 2390 queue_delayed_work(system_power_efficient_wq, &check_lifetime_work, 0);
5c766d64 2391
9f0f7272
TG		 2392 rtnl_af_register(&inet_af_ops);
2393
c7ac8679
GR		 2394 rtnl_register(PF_INET, RTM_NEWADDR, inet_rtm_newaddr, NULL, NULL);
2395 rtnl_register(PF_INET, RTM_DELADDR, inet_rtm_deladdr, NULL, NULL);
2396 rtnl_register(PF_INET, RTM_GETADDR, NULL, inet_dump_ifaddr, NULL);
9e551110 2397 rtnl_register(PF_INET, RTM_GETNETCONF, inet_netconf_get_devconf,
7a674200 2398 inet_netconf_dump_devconf, NULL);
1da177e4
LT		 2399}
2400
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