projects / linux-2.6-block.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
switchdev: fix typo in inline function definition
[linux-2.6-block.git] / net / ipv4 / devinet.c
CommitLineData
1da177e4
LT		 1/*
2 * NET3 IP device support routines.
3 *
1da177e4
LT		 4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
8 *
9 * Derived from the IP parts of dev.c 1.0.19
02c30a84 10 * Authors: Ross Biro
1da177e4
LT		 11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 * Mark Evans, <evansmp@uhura.aston.ac.uk>
13 *
14 * Additional Authors:
15 * Alan Cox, <gw4pts@gw4pts.ampr.org>
16 * Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
17 *
18 * Changes:
19 * Alexey Kuznetsov: pa_* fields are replaced with ifaddr
20 * lists.
21 * Cyrus Durgin: updated for kmod
22 * Matthias Andree: in devinet_ioctl, compare label and
23 * address (4.4BSD alias style support),
24 * fall back to comparing just the label
25 * if no match found.
26 */
27
1da177e4
LT		 28
29#include <asm/uaccess.h>
1da177e4 30#include <linux/bitops.h>
4fc268d2 31#include <linux/capability.h>
1da177e4
LT		 32#include <linux/module.h>
33#include <linux/types.h>
34#include <linux/kernel.h>
1da177e4
LT		 35#include <linux/string.h>
36#include <linux/mm.h>
37#include <linux/socket.h>
38#include <linux/sockios.h>
39#include <linux/in.h>
40#include <linux/errno.h>
41#include <linux/interrupt.h>
1823730f 42#include <linux/if_addr.h>
1da177e4
LT		 43#include <linux/if_ether.h>
44#include <linux/inet.h>
45#include <linux/netdevice.h>
46#include <linux/etherdevice.h>
47#include <linux/skbuff.h>
1da177e4
LT		 48#include <linux/init.h>
49#include <linux/notifier.h>
50#include <linux/inetdevice.h>
51#include <linux/igmp.h>
5a0e3ad6 52#include <linux/slab.h>
fd23c3b3 53#include <linux/hash.h>
1da177e4
LT		 54#ifdef CONFIG_SYSCTL
55#include <linux/sysctl.h>
56#endif
57#include <linux/kmod.h>
edc9e748 58#include <linux/netconf.h>
1da177e4 59
14c85021 60#include <net/arp.h>
1da177e4
LT		 61#include <net/ip.h>
62#include <net/route.h>
63#include <net/ip_fib.h>
63f3444f 64#include <net/rtnetlink.h>
752d14dc 65#include <net/net_namespace.h>
5c766d64 66#include <net/addrconf.h>
1da177e4 67
406b6f97
DM		 68#include "fib_lookup.h"
69
0027ba84 70static struct ipv4_devconf ipv4_devconf = {
42f811b8 71 .data = {
02291680
EB		 72 [IPV4_DEVCONF_ACCEPT_REDIRECTS - 1] = 1,
73 [IPV4_DEVCONF_SEND_REDIRECTS - 1] = 1,
74 [IPV4_DEVCONF_SECURE_REDIRECTS - 1] = 1,
75 [IPV4_DEVCONF_SHARED_MEDIA - 1] = 1,
2690048c
WM		 76 [IPV4_DEVCONF_IGMPV2_UNSOLICITED_REPORT_INTERVAL - 1] = 10000 /*ms*/,
77 [IPV4_DEVCONF_IGMPV3_UNSOLICITED_REPORT_INTERVAL - 1] = 1000 /*ms*/,
42f811b8 78 },
1da177e4
LT		 79};
80
81static struct ipv4_devconf ipv4_devconf_dflt = {
42f811b8 82 .data = {
02291680
EB		 83 [IPV4_DEVCONF_ACCEPT_REDIRECTS - 1] = 1,
84 [IPV4_DEVCONF_SEND_REDIRECTS - 1] = 1,
85 [IPV4_DEVCONF_SECURE_REDIRECTS - 1] = 1,
86 [IPV4_DEVCONF_SHARED_MEDIA - 1] = 1,
87 [IPV4_DEVCONF_ACCEPT_SOURCE_ROUTE - 1] = 1,
2690048c
WM		 88 [IPV4_DEVCONF_IGMPV2_UNSOLICITED_REPORT_INTERVAL - 1] = 10000 /*ms*/,
89 [IPV4_DEVCONF_IGMPV3_UNSOLICITED_REPORT_INTERVAL - 1] = 1000 /*ms*/,
42f811b8 90 },
1da177e4
LT		 91};
92
9355bbd6
PE		 93#define IPV4_DEVCONF_DFLT(net, attr) \
94 IPV4_DEVCONF((*net->ipv4.devconf_dflt), attr)
42f811b8 95
ef7c79ed 96static const struct nla_policy ifa_ipv4_policy[IFA_MAX+1] = {
5c753978
TG		 97 [IFA_LOCAL] = { .type = NLA_U32 },
98 [IFA_ADDRESS] = { .type = NLA_U32 },
99 [IFA_BROADCAST] = { .type = NLA_U32 },
5176f91e 100 [IFA_LABEL] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 },
5c766d64 101 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
ad6c8135 102 [IFA_FLAGS] = { .type = NLA_U32 },
5c753978
TG		 103};
104
40384999
ED		 105#define IN4_ADDR_HSIZE_SHIFT 8
106#define IN4_ADDR_HSIZE (1U << IN4_ADDR_HSIZE_SHIFT)
107
fd23c3b3 108static struct hlist_head inet_addr_lst[IN4_ADDR_HSIZE];
fd23c3b3 109
40384999 110static u32 inet_addr_hash(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
661d2967 551static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 552{
3b1e0a65 553 struct net *net = sock_net(skb->sk);
dfdd5fd4 554 struct nlattr *tb[IFA_MAX+1];
1da177e4 555 struct in_device *in_dev;
dfdd5fd4 556 struct ifaddrmsg *ifm;
1da177e4 557 struct in_ifaddr *ifa, **ifap;
dfdd5fd4 558 int err = -EINVAL;
1da177e4
LT		 559
560 ASSERT_RTNL();
561
dfdd5fd4
TG		 562 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy);
563 if (err < 0)
564 goto errout;
565
566 ifm = nlmsg_data(nlh);
7fee0ca2 567 in_dev = inetdev_by_index(net, ifm->ifa_index);
dfdd5fd4
TG		 568 if (in_dev == NULL) {
569 err = -ENODEV;
570 goto errout;
571 }
572
1da177e4
LT		 573 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
574 ifap = &ifa->ifa_next) {
dfdd5fd4 575 if (tb[IFA_LOCAL] &&
a7a628c4 576 ifa->ifa_local != nla_get_be32(tb[IFA_LOCAL]))
dfdd5fd4
TG		 577 continue;
578
579 if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label))
1da177e4 580 continue;
dfdd5fd4
TG		 581
582 if (tb[IFA_ADDRESS] &&
583 (ifm->ifa_prefixlen != ifa->ifa_prefixlen ||
a7a628c4 584 !inet_ifa_match(nla_get_be32(tb[IFA_ADDRESS]), ifa)))
dfdd5fd4
TG		 585 continue;
586
15e47304 587 __inet_del_ifa(in_dev, ifap, 1, nlh, NETLINK_CB(skb).portid);
1da177e4
LT		 588 return 0;
589 }
dfdd5fd4
TG		 590
591 err = -EADDRNOTAVAIL;
592errout:
593 return err;
1da177e4
LT		 594}
595
5c766d64
JP		 596#define INFINITY_LIFE_TIME 0xFFFFFFFF
597
598static void check_lifetime(struct work_struct *work)
599{
600 unsigned long now, next, next_sec, next_sched;
601 struct in_ifaddr *ifa;
c988d1e8 602 struct hlist_node *n;
5c766d64
JP		 603 int i;
604
605 now = jiffies;
606 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
607
5c766d64 608 for (i = 0; i < IN4_ADDR_HSIZE; i++) {
c988d1e8
JP		 609 bool change_needed = false;
610
611 rcu_read_lock();
b67bfe0d 612 hlist_for_each_entry_rcu(ifa, &inet_addr_lst[i], hash) {
5c766d64
JP		 613 unsigned long age;
614
615 if (ifa->ifa_flags & IFA_F_PERMANENT)
616 continue;
617
618 /* We try to batch several events at once. */
619 age = (now - ifa->ifa_tstamp +
620 ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
621
622 if (ifa->ifa_valid_lft != INFINITY_LIFE_TIME &&
623 age >= ifa->ifa_valid_lft) {
c988d1e8 624 change_needed = true;
5c766d64
JP		 625 } else if (ifa->ifa_preferred_lft ==
626 INFINITY_LIFE_TIME) {
627 continue;
628 } else if (age >= ifa->ifa_preferred_lft) {
629 if (time_before(ifa->ifa_tstamp +
630 ifa->ifa_valid_lft * HZ, next))
631 next = ifa->ifa_tstamp +
632 ifa->ifa_valid_lft * HZ;
633
c988d1e8
JP		 634 if (!(ifa->ifa_flags & IFA_F_DEPRECATED))
635 change_needed = true;
5c766d64
JP		 636 } else if (time_before(ifa->ifa_tstamp +
637 ifa->ifa_preferred_lft * HZ,
638 next)) {
639 next = ifa->ifa_tstamp +
640 ifa->ifa_preferred_lft * HZ;
641 }
642 }
c988d1e8
JP		 643 rcu_read_unlock();
644 if (!change_needed)
645 continue;
646 rtnl_lock();
647 hlist_for_each_entry_safe(ifa, n, &inet_addr_lst[i], hash) {
648 unsigned long age;
649
650 if (ifa->ifa_flags & IFA_F_PERMANENT)
651 continue;
652
653 /* We try to batch several events at once. */
654 age = (now - ifa->ifa_tstamp +
655 ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
656
657 if (ifa->ifa_valid_lft != INFINITY_LIFE_TIME &&
658 age >= ifa->ifa_valid_lft) {
659 struct in_ifaddr **ifap;
660
661 for (ifap = &ifa->ifa_dev->ifa_list;
662 *ifap != NULL; ifap = &(*ifap)->ifa_next) {
663 if (*ifap == ifa) {
664 inet_del_ifa(ifa->ifa_dev,
665 ifap, 1);
666 break;
667 }
668 }
669 } else if (ifa->ifa_preferred_lft !=
670 INFINITY_LIFE_TIME &&
671 age >= ifa->ifa_preferred_lft &&
672 !(ifa->ifa_flags & IFA_F_DEPRECATED)) {
673 ifa->ifa_flags |= IFA_F_DEPRECATED;
674 rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0);
675 }
676 }
677 rtnl_unlock();
5c766d64 678 }
5c766d64
JP		 679
680 next_sec = round_jiffies_up(next);
681 next_sched = next;
682
683 /* If rounded timeout is accurate enough, accept it. */
684 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
685 next_sched = next_sec;
686
687 now = jiffies;
688 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
689 if (time_before(next_sched, now + ADDRCONF_TIMER_FUZZ_MAX))
690 next_sched = now + ADDRCONF_TIMER_FUZZ_MAX;
691
906e073f 692 queue_delayed_work(system_power_efficient_wq, &check_lifetime_work,
693 next_sched - now);
5c766d64
JP		 694}
695
696static void set_ifa_lifetime(struct in_ifaddr *ifa, __u32 valid_lft,
697 __u32 prefered_lft)
698{
699 unsigned long timeout;
700
701 ifa->ifa_flags &= ~(IFA_F_PERMANENT | IFA_F_DEPRECATED);
702
703 timeout = addrconf_timeout_fixup(valid_lft, HZ);
704 if (addrconf_finite_timeout(timeout))
705 ifa->ifa_valid_lft = timeout;
706 else
707 ifa->ifa_flags |= IFA_F_PERMANENT;
708
709 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
710 if (addrconf_finite_timeout(timeout)) {
711 if (timeout == 0)
712 ifa->ifa_flags |= IFA_F_DEPRECATED;
713 ifa->ifa_preferred_lft = timeout;
714 }
715 ifa->ifa_tstamp = jiffies;
716 if (!ifa->ifa_cstamp)
717 ifa->ifa_cstamp = ifa->ifa_tstamp;
718}
719
720static struct in_ifaddr *rtm_to_ifaddr(struct net *net, struct nlmsghdr *nlh,
721 __u32 *pvalid_lft, __u32 *pprefered_lft)
1da177e4 722{
5c753978
TG		 723 struct nlattr *tb[IFA_MAX+1];
724 struct in_ifaddr *ifa;
725 struct ifaddrmsg *ifm;
1da177e4
LT		 726 struct net_device *dev;
727 struct in_device *in_dev;
7b218574 728 int err;
1da177e4 729
5c753978
TG		 730 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy);
731 if (err < 0)
732 goto errout;
1da177e4 733
5c753978 734 ifm = nlmsg_data(nlh);
7b218574
DL		 735 err = -EINVAL;
736 if (ifm->ifa_prefixlen > 32 || tb[IFA_LOCAL] == NULL)
5c753978 737 goto errout;
1da177e4 738
4b8aa9ab 739 dev = __dev_get_by_index(net, ifm->ifa_index);
7b218574
DL		 740 err = -ENODEV;
741 if (dev == NULL)
5c753978 742 goto errout;
1da177e4 743
5c753978 744 in_dev = __in_dev_get_rtnl(dev);
7b218574
DL		 745 err = -ENOBUFS;
746 if (in_dev == NULL)
71e27da9 747 goto errout;
1da177e4 748
5c753978 749 ifa = inet_alloc_ifa();
7b218574 750 if (ifa == NULL)
5c753978
TG		 751 /*
752 * A potential indev allocation can be left alive, it stays
753 * assigned to its device and is destroy with it.
754 */
5c753978 755 goto errout;
5c753978 756
a4e65d36 757 ipv4_devconf_setall(in_dev);
1d4c8c29 758 neigh_parms_data_state_setall(in_dev->arp_parms);
5c753978
TG		 759 in_dev_hold(in_dev);
760
761 if (tb[IFA_ADDRESS] == NULL)
762 tb[IFA_ADDRESS] = tb[IFA_LOCAL];
1da177e4 763
fd23c3b3 764 INIT_HLIST_NODE(&ifa->hash);
1da177e4
LT		 765 ifa->ifa_prefixlen = ifm->ifa_prefixlen;
766 ifa->ifa_mask = inet_make_mask(ifm->ifa_prefixlen);
ad6c8135
JP		 767 ifa->ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) :
768 ifm->ifa_flags;
1da177e4 769 ifa->ifa_scope = ifm->ifa_scope;
5c753978
TG		 770 ifa->ifa_dev = in_dev;
771
a7a628c4
AV		 772 ifa->ifa_local = nla_get_be32(tb[IFA_LOCAL]);
773 ifa->ifa_address = nla_get_be32(tb[IFA_ADDRESS]);
5c753978
TG		 774
775 if (tb[IFA_BROADCAST])
a7a628c4 776 ifa->ifa_broadcast = nla_get_be32(tb[IFA_BROADCAST]);
5c753978 777
5c753978
TG		 778 if (tb[IFA_LABEL])
779 nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ);
1da177e4
LT		 780 else
781 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
782
5c766d64
JP		 783 if (tb[IFA_CACHEINFO]) {
784 struct ifa_cacheinfo *ci;
785
786 ci = nla_data(tb[IFA_CACHEINFO]);
787 if (!ci->ifa_valid || ci->ifa_prefered > ci->ifa_valid) {
788 err = -EINVAL;
446266b0 789 goto errout_free;
5c766d64
JP		 790 }
791 *pvalid_lft = ci->ifa_valid;
792 *pprefered_lft = ci->ifa_prefered;
793 }
794
5c753978
TG		 795 return ifa;
796
446266b0
DB		 797errout_free:
798 inet_free_ifa(ifa);
5c753978
TG		 799errout:
800 return ERR_PTR(err);
801}
802
5c766d64
JP		 803static struct in_ifaddr *find_matching_ifa(struct in_ifaddr *ifa)
804{
805 struct in_device *in_dev = ifa->ifa_dev;
806 struct in_ifaddr *ifa1, **ifap;
807
808 if (!ifa->ifa_local)
809 return NULL;
810
811 for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL;
812 ifap = &ifa1->ifa_next) {
813 if (ifa1->ifa_mask == ifa->ifa_mask &&
814 inet_ifa_match(ifa1->ifa_address, ifa) &&
815 ifa1->ifa_local == ifa->ifa_local)
816 return ifa1;
817 }
818 return NULL;
819}
820
661d2967 821static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
5c753978 822{
3b1e0a65 823 struct net *net = sock_net(skb->sk);
5c753978 824 struct in_ifaddr *ifa;
5c766d64
JP		 825 struct in_ifaddr *ifa_existing;
826 __u32 valid_lft = INFINITY_LIFE_TIME;
827 __u32 prefered_lft = INFINITY_LIFE_TIME;
5c753978
TG		 828
829 ASSERT_RTNL();
830
5c766d64 831 ifa = rtm_to_ifaddr(net, nlh, &valid_lft, &prefered_lft);
5c753978
TG		 832 if (IS_ERR(ifa))
833 return PTR_ERR(ifa);
834
5c766d64
JP		 835 ifa_existing = find_matching_ifa(ifa);
836 if (!ifa_existing) {
837 /* It would be best to check for !NLM_F_CREATE here but
614d056c 838 * userspace already relies on not having to provide this.
5c766d64
JP		 839 */
840 set_ifa_lifetime(ifa, valid_lft, prefered_lft);
841 return __inet_insert_ifa(ifa, nlh, NETLINK_CB(skb).portid);
842 } else {
843 inet_free_ifa(ifa);
844
845 if (nlh->nlmsg_flags & NLM_F_EXCL ||
846 !(nlh->nlmsg_flags & NLM_F_REPLACE))
847 return -EEXIST;
34e2ed34
JP		 848 ifa = ifa_existing;
849 set_ifa_lifetime(ifa, valid_lft, prefered_lft);
05a324b9 850 cancel_delayed_work(&check_lifetime_work);
906e073f 851 queue_delayed_work(system_power_efficient_wq,
852 &check_lifetime_work, 0);
34e2ed34
JP		 853 rtmsg_ifa(RTM_NEWADDR, ifa, nlh, NETLINK_CB(skb).portid);
854 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa);
5c766d64
JP		 855 }
856 return 0;
1da177e4
LT		 857}
858
859/*
860 * Determine a default network mask, based on the IP address.
861 */
862
40384999 863static int inet_abc_len(__be32 addr)
1da177e4
LT		 864{
865 int rc = -1; /* Something else, probably a multicast. */
866
f97c1e0c 867 if (ipv4_is_zeronet(addr))
e905a9ed 868 rc = 0;
1da177e4 869 else {
714e85be 870 __u32 haddr = ntohl(addr);
1da177e4 871
714e85be 872 if (IN_CLASSA(haddr))
1da177e4 873 rc = 8;
714e85be 874 else if (IN_CLASSB(haddr))
1da177e4 875 rc = 16;
714e85be 876 else if (IN_CLASSC(haddr))
1da177e4
LT		 877 rc = 24;
878 }
879
e905a9ed 880 return rc;
1da177e4
LT		 881}
882
883
e5b13cb1 884int devinet_ioctl(struct net *net, unsigned int cmd, void __user *arg)
1da177e4
LT		 885{
886 struct ifreq ifr;
887 struct sockaddr_in sin_orig;
888 struct sockaddr_in *sin = (struct sockaddr_in *)&ifr.ifr_addr;
889 struct in_device *in_dev;
890 struct in_ifaddr **ifap = NULL;
891 struct in_ifaddr *ifa = NULL;
892 struct net_device *dev;
893 char *colon;
894 int ret = -EFAULT;
895 int tryaddrmatch = 0;
896
897 /*
898 * Fetch the caller's info block into kernel space
899 */
900
901 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
902 goto out;
903 ifr.ifr_name[IFNAMSIZ - 1] = 0;
904
905 /* save original address for comparison */
906 memcpy(&sin_orig, sin, sizeof(*sin));
907
908 colon = strchr(ifr.ifr_name, ':');
909 if (colon)
910 *colon = 0;
911
e5b13cb1 912 dev_load(net, ifr.ifr_name);
1da177e4 913
132adf54 914 switch (cmd) {
1da177e4
LT		 915 case SIOCGIFADDR: /* Get interface address */
916 case SIOCGIFBRDADDR: /* Get the broadcast address */
917 case SIOCGIFDSTADDR: /* Get the destination address */
918 case SIOCGIFNETMASK: /* Get the netmask for the interface */
919 /* Note that these ioctls will not sleep,
920 so that we do not impose a lock.
921 One day we will be forced to put shlock here (I mean SMP)
922 */
923 tryaddrmatch = (sin_orig.sin_family == AF_INET);
924 memset(sin, 0, sizeof(*sin));
925 sin->sin_family = AF_INET;
926 break;
927
928 case SIOCSIFFLAGS:
bf5b30b8 929 ret = -EPERM;
52e804c6 930 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 931 goto out;
932 break;
933 case SIOCSIFADDR: /* Set interface address (and family) */
934 case SIOCSIFBRDADDR: /* Set the broadcast address */
935 case SIOCSIFDSTADDR: /* Set the destination address */
936 case SIOCSIFNETMASK: /* Set the netmask for the interface */
bf5b30b8 937 ret = -EPERM;
52e804c6 938 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 939 goto out;
940 ret = -EINVAL;
941 if (sin->sin_family != AF_INET)
942 goto out;
943 break;
944 default:
945 ret = -EINVAL;
946 goto out;
947 }
948
949 rtnl_lock();
950
951 ret = -ENODEV;
9f9354b9
ED		 952 dev = __dev_get_by_name(net, ifr.ifr_name);
953 if (!dev)
1da177e4
LT		 954 goto done;
955
956 if (colon)
957 *colon = ':';
958
9f9354b9
ED		 959 in_dev = __in_dev_get_rtnl(dev);
960 if (in_dev) {
1da177e4
LT		 961 if (tryaddrmatch) {
962 /* Matthias Andree */
963 /* compare label and address (4.4BSD style) */
964 /* note: we only do this for a limited set of ioctls
965 and only if the original address family was AF_INET.
966 This is checked above. */
967 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
968 ifap = &ifa->ifa_next) {
969 if (!strcmp(ifr.ifr_name, ifa->ifa_label) &&
970 sin_orig.sin_addr.s_addr ==
6c91afe1 971 ifa->ifa_local) {
1da177e4
LT		 972 break; /* found */
973 }
974 }
975 }
976 /* we didn't get a match, maybe the application is
977 4.3BSD-style and passed in junk so we fall back to
978 comparing just the label */
979 if (!ifa) {
980 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
981 ifap = &ifa->ifa_next)
982 if (!strcmp(ifr.ifr_name, ifa->ifa_label))
983 break;
984 }
985 }
986
987 ret = -EADDRNOTAVAIL;
988 if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS)
989 goto done;
990
132adf54 991 switch (cmd) {
1da177e4
LT		 992 case SIOCGIFADDR: /* Get interface address */
993 sin->sin_addr.s_addr = ifa->ifa_local;
994 goto rarok;
995
996 case SIOCGIFBRDADDR: /* Get the broadcast address */
997 sin->sin_addr.s_addr = ifa->ifa_broadcast;
998 goto rarok;
999
1000 case SIOCGIFDSTADDR: /* Get the destination address */
1001 sin->sin_addr.s_addr = ifa->ifa_address;
1002 goto rarok;
1003
1004 case SIOCGIFNETMASK: /* Get the netmask for the interface */
1005 sin->sin_addr.s_addr = ifa->ifa_mask;
1006 goto rarok;
1007
1008 case SIOCSIFFLAGS:
1009 if (colon) {
1010 ret = -EADDRNOTAVAIL;
1011 if (!ifa)
1012 break;
1013 ret = 0;
1014 if (!(ifr.ifr_flags & IFF_UP))
1015 inet_del_ifa(in_dev, ifap, 1);
1016 break;
1017 }
1018 ret = dev_change_flags(dev, ifr.ifr_flags);
1019 break;
1020
1021 case SIOCSIFADDR: /* Set interface address (and family) */
1022 ret = -EINVAL;
1023 if (inet_abc_len(sin->sin_addr.s_addr) < 0)
1024 break;
1025
1026 if (!ifa) {
1027 ret = -ENOBUFS;
9f9354b9
ED		 1028 ifa = inet_alloc_ifa();
1029 if (!ifa)
1da177e4 1030 break;
c7e2e1d7 1031 INIT_HLIST_NODE(&ifa->hash);
1da177e4
LT		 1032 if (colon)
1033 memcpy(ifa->ifa_label, ifr.ifr_name, IFNAMSIZ);
1034 else
1035 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1036 } else {
1037 ret = 0;
1038 if (ifa->ifa_local == sin->sin_addr.s_addr)
1039 break;
1040 inet_del_ifa(in_dev, ifap, 0);
1041 ifa->ifa_broadcast = 0;
148f9729 1042 ifa->ifa_scope = 0;
1da177e4
LT		 1043 }
1044
1045 ifa->ifa_address = ifa->ifa_local = sin->sin_addr.s_addr;
1046
1047 if (!(dev->flags & IFF_POINTOPOINT)) {
1048 ifa->ifa_prefixlen = inet_abc_len(ifa->ifa_address);
1049 ifa->ifa_mask = inet_make_mask(ifa->ifa_prefixlen);
1050 if ((dev->flags & IFF_BROADCAST) &&
1051 ifa->ifa_prefixlen < 31)
1052 ifa->ifa_broadcast = ifa->ifa_address |
1053 ~ifa->ifa_mask;
1054 } else {
1055 ifa->ifa_prefixlen = 32;
1056 ifa->ifa_mask = inet_make_mask(32);
1057 }
5c766d64 1058 set_ifa_lifetime(ifa, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 1059 ret = inet_set_ifa(dev, ifa);
1060 break;
1061
1062 case SIOCSIFBRDADDR: /* Set the broadcast address */
1063 ret = 0;
1064 if (ifa->ifa_broadcast != sin->sin_addr.s_addr) {
1065 inet_del_ifa(in_dev, ifap, 0);
1066 ifa->ifa_broadcast = sin->sin_addr.s_addr;
1067 inet_insert_ifa(ifa);
1068 }
1069 break;
1070
1071 case SIOCSIFDSTADDR: /* Set the destination address */
1072 ret = 0;
1073 if (ifa->ifa_address == sin->sin_addr.s_addr)
1074 break;
1075 ret = -EINVAL;
1076 if (inet_abc_len(sin->sin_addr.s_addr) < 0)
1077 break;
1078 ret = 0;
1079 inet_del_ifa(in_dev, ifap, 0);
1080 ifa->ifa_address = sin->sin_addr.s_addr;
1081 inet_insert_ifa(ifa);
1082 break;
1083
1084 case SIOCSIFNETMASK: /* Set the netmask for the interface */
1085
1086 /*
1087 * The mask we set must be legal.
1088 */
1089 ret = -EINVAL;
1090 if (bad_mask(sin->sin_addr.s_addr, 0))
1091 break;
1092 ret = 0;
1093 if (ifa->ifa_mask != sin->sin_addr.s_addr) {
a144ea4b 1094 __be32 old_mask = ifa->ifa_mask;
1da177e4
LT		 1095 inet_del_ifa(in_dev, ifap, 0);
1096 ifa->ifa_mask = sin->sin_addr.s_addr;
1097 ifa->ifa_prefixlen = inet_mask_len(ifa->ifa_mask);
1098
1099 /* See if current broadcast address matches
1100 * with current netmask, then recalculate
1101 * the broadcast address. Otherwise it's a
1102 * funny address, so don't touch it since
1103 * the user seems to know what (s)he's doing...
1104 */
1105 if ((dev->flags & IFF_BROADCAST) &&
1106 (ifa->ifa_prefixlen < 31) &&
1107 (ifa->ifa_broadcast ==
dcab5e1e 1108 (ifa->ifa_local|~old_mask))) {
1da177e4
LT		 1109 ifa->ifa_broadcast = (ifa->ifa_local |
1110 ~sin->sin_addr.s_addr);
1111 }
1112 inet_insert_ifa(ifa);
1113 }
1114 break;
1115 }
1116done:
1117 rtnl_unlock();
1118out:
1119 return ret;
1120rarok:
1121 rtnl_unlock();
1122 ret = copy_to_user(arg, &ifr, sizeof(struct ifreq)) ? -EFAULT : 0;
1123 goto out;
1124}
1125
1126static int inet_gifconf(struct net_device *dev, char __user *buf, int len)
1127{
e5ed6399 1128 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1da177e4
LT		 1129 struct in_ifaddr *ifa;
1130 struct ifreq ifr;
1131 int done = 0;
1132
9f9354b9 1133 if (!in_dev)
1da177e4
LT		 1134 goto out;
1135
9f9354b9 1136 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1da177e4
LT		 1137 if (!buf) {
1138 done += sizeof(ifr);
1139 continue;
1140 }
1141 if (len < (int) sizeof(ifr))
1142 break;
1143 memset(&ifr, 0, sizeof(struct ifreq));
4299c8a9 1144 strcpy(ifr.ifr_name, ifa->ifa_label);
1da177e4
LT		 1145
1146 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_family = AF_INET;
1147 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_addr.s_addr =
1148 ifa->ifa_local;
1149
1150 if (copy_to_user(buf, &ifr, sizeof(struct ifreq))) {
1151 done = -EFAULT;
1152 break;
1153 }
1154 buf += sizeof(struct ifreq);
1155 len -= sizeof(struct ifreq);
1156 done += sizeof(struct ifreq);
1157 }
1158out:
1159 return done;
1160}
1161
a61ced5d 1162__be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope)
1da177e4 1163{
a61ced5d 1164 __be32 addr = 0;
1da177e4 1165 struct in_device *in_dev;
c346dca1 1166 struct net *net = dev_net(dev);
1da177e4
LT		 1167
1168 rcu_read_lock();
e5ed6399 1169 in_dev = __in_dev_get_rcu(dev);
1da177e4
LT		 1170 if (!in_dev)
1171 goto no_in_dev;
1172
1173 for_primary_ifa(in_dev) {
1174 if (ifa->ifa_scope > scope)
1175 continue;
1176 if (!dst || inet_ifa_match(dst, ifa)) {
1177 addr = ifa->ifa_local;
1178 break;
1179 }
1180 if (!addr)
1181 addr = ifa->ifa_local;
1182 } endfor_ifa(in_dev);
1da177e4
LT		 1183
1184 if (addr)
c6d14c84 1185 goto out_unlock;
9f9354b9 1186no_in_dev:
1da177e4
LT		 1187
1188 /* Not loopback addresses on loopback should be preferred
1189 in this case. It is importnat that lo is the first interface
1190 in dev_base list.
1191 */
c6d14c84 1192 for_each_netdev_rcu(net, dev) {
9f9354b9
ED		 1193 in_dev = __in_dev_get_rcu(dev);
1194 if (!in_dev)
1da177e4
LT		 1195 continue;
1196
1197 for_primary_ifa(in_dev) {
1198 if (ifa->ifa_scope != RT_SCOPE_LINK &&
1199 ifa->ifa_scope <= scope) {
1200 addr = ifa->ifa_local;
c6d14c84 1201 goto out_unlock;
1da177e4
LT		 1202 }
1203 } endfor_ifa(in_dev);
1204 }
c6d14c84 1205out_unlock:
1da177e4 1206 rcu_read_unlock();
1da177e4
LT		 1207 return addr;
1208}
9f9354b9 1209EXPORT_SYMBOL(inet_select_addr);
1da177e4 1210
60cad5da
AV		 1211static __be32 confirm_addr_indev(struct in_device *in_dev, __be32 dst,
1212 __be32 local, int scope)
1da177e4
LT		 1213{
1214 int same = 0;
a144ea4b 1215 __be32 addr = 0;
1da177e4
LT		 1216
1217 for_ifa(in_dev) {
1218 if (!addr &&
1219 (local == ifa->ifa_local || !local) &&
1220 ifa->ifa_scope <= scope) {
1221 addr = ifa->ifa_local;
1222 if (same)
1223 break;
1224 }
1225 if (!same) {
1226 same = (!local || inet_ifa_match(local, ifa)) &&
1227 (!dst || inet_ifa_match(dst, ifa));
1228 if (same && addr) {
1229 if (local || !dst)
1230 break;
1231 /* Is the selected addr into dst subnet? */
1232 if (inet_ifa_match(addr, ifa))
1233 break;
1234 /* No, then can we use new local src? */
1235 if (ifa->ifa_scope <= scope) {
1236 addr = ifa->ifa_local;
1237 break;
1238 }
1239 /* search for large dst subnet for addr */
1240 same = 0;
1241 }
1242 }
1243 } endfor_ifa(in_dev);
1244
9f9354b9 1245 return same ? addr : 0;
1da177e4
LT		 1246}
1247
1248/*
1249 * Confirm that local IP address exists using wildcards:
b601fa19
ND		 1250 * - net: netns to check, cannot be NULL
1251 * - in_dev: only on this interface, NULL=any interface
1da177e4
LT		 1252 * - dst: only in the same subnet as dst, 0=any dst
1253 * - local: address, 0=autoselect the local address
1254 * - scope: maximum allowed scope value for the local address
1255 */
b601fa19 1256__be32 inet_confirm_addr(struct net *net, struct in_device *in_dev,
9bd85e32 1257 __be32 dst, __be32 local, int scope)
1da177e4 1258{
60cad5da 1259 __be32 addr = 0;
9bd85e32 1260 struct net_device *dev;
1da177e4 1261
b601fa19 1262 if (in_dev != NULL)
9bd85e32 1263 return confirm_addr_indev(in_dev, dst, local, scope);
1da177e4 1264
1da177e4 1265 rcu_read_lock();
c6d14c84 1266 for_each_netdev_rcu(net, dev) {
9f9354b9
ED		 1267 in_dev = __in_dev_get_rcu(dev);
1268 if (in_dev) {
1da177e4
LT		 1269 addr = confirm_addr_indev(in_dev, dst, local, scope);
1270 if (addr)
1271 break;
1272 }
1273 }
1274 rcu_read_unlock();
1da177e4
LT		 1275
1276 return addr;
1277}
eaddcd76 1278EXPORT_SYMBOL(inet_confirm_addr);
1da177e4
LT		 1279
1280/*
1281 * Device notifier
1282 */
1283
1284int register_inetaddr_notifier(struct notifier_block *nb)
1285{
e041c683 1286 return blocking_notifier_chain_register(&inetaddr_chain, nb);
1da177e4 1287}
9f9354b9 1288EXPORT_SYMBOL(register_inetaddr_notifier);
1da177e4
LT		 1289
1290int unregister_inetaddr_notifier(struct notifier_block *nb)
1291{
e041c683 1292 return blocking_notifier_chain_unregister(&inetaddr_chain, nb);
1da177e4 1293}
9f9354b9 1294EXPORT_SYMBOL(unregister_inetaddr_notifier);
1da177e4 1295
9f9354b9
ED		 1296/* Rename ifa_labels for a device name change. Make some effort to preserve
1297 * existing alias numbering and to create unique labels if possible.
1da177e4
LT		 1298*/
1299static void inetdev_changename(struct net_device *dev, struct in_device *in_dev)
e905a9ed 1300{
1da177e4
LT		 1301 struct in_ifaddr *ifa;
1302 int named = 0;
1303
e905a9ed
YH		 1304 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1305 char old[IFNAMSIZ], *dot;
1da177e4
LT		 1306
1307 memcpy(old, ifa->ifa_label, IFNAMSIZ);
e905a9ed 1308 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1da177e4 1309 if (named++ == 0)
573bf470 1310 goto skip;
44344b2a 1311 dot = strchr(old, ':');
e905a9ed
YH		 1312 if (dot == NULL) {
1313 sprintf(old, ":%d", named);
1da177e4
LT		 1314 dot = old;
1315 }
9f9354b9 1316 if (strlen(dot) + strlen(dev->name) < IFNAMSIZ)
e905a9ed 1317 strcat(ifa->ifa_label, dot);
9f9354b9 1318 else
e905a9ed 1319 strcpy(ifa->ifa_label + (IFNAMSIZ - strlen(dot) - 1), dot);
573bf470
TG		 1320skip:
1321 rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0);
e905a9ed
YH		 1322 }
1323}
1da177e4 1324
40384999 1325static bool inetdev_valid_mtu(unsigned int mtu)
06770843
BL		 1326{
1327 return mtu >= 68;
1328}
1329
d11327ad
IC		 1330static void inetdev_send_gratuitous_arp(struct net_device *dev,
1331 struct in_device *in_dev)
1332
1333{
b76d0789 1334 struct in_ifaddr *ifa;
d11327ad 1335
b76d0789
ZK		 1336 for (ifa = in_dev->ifa_list; ifa;
1337 ifa = ifa->ifa_next) {
1338 arp_send(ARPOP_REQUEST, ETH_P_ARP,
1339 ifa->ifa_local, dev,
1340 ifa->ifa_local, NULL,
1341 dev->dev_addr, NULL);
1342 }
d11327ad
IC		 1343}
1344
1da177e4
LT		 1345/* Called only under RTNL semaphore */
1346
1347static int inetdev_event(struct notifier_block *this, unsigned long event,
1348 void *ptr)
1349{
351638e7 1350 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
748e2d93 1351 struct in_device *in_dev = __in_dev_get_rtnl(dev);
0115e8e3 1352
1da177e4
LT		 1353 ASSERT_RTNL();
1354
1355 if (!in_dev) {
8030f544 1356 if (event == NETDEV_REGISTER) {
1da177e4 1357 in_dev = inetdev_init(dev);
20e61da7
WC		 1358 if (IS_ERR(in_dev))
1359 return notifier_from_errno(PTR_ERR(in_dev));
0cc217e1 1360 if (dev->flags & IFF_LOOPBACK) {
42f811b8
HX		 1361 IN_DEV_CONF_SET(in_dev, NOXFRM, 1);
1362 IN_DEV_CONF_SET(in_dev, NOPOLICY, 1);
8030f544 1363 }
06770843
BL		 1364 } else if (event == NETDEV_CHANGEMTU) {
1365 /* Re-enabling IP */
1366 if (inetdev_valid_mtu(dev->mtu))
1367 in_dev = inetdev_init(dev);
1da177e4
LT		 1368 }
1369 goto out;
1370 }
1371
1372 switch (event) {
1373 case NETDEV_REGISTER:
91df42be 1374 pr_debug("%s: bug\n", __func__);
a9b3cd7f 1375 RCU_INIT_POINTER(dev->ip_ptr, NULL);
1da177e4
LT		 1376 break;
1377 case NETDEV_UP:
06770843 1378 if (!inetdev_valid_mtu(dev->mtu))
1da177e4 1379 break;
0cc217e1 1380 if (dev->flags & IFF_LOOPBACK) {
9f9354b9
ED		 1381 struct in_ifaddr *ifa = inet_alloc_ifa();
1382
1383 if (ifa) {
fd23c3b3 1384 INIT_HLIST_NODE(&ifa->hash);
1da177e4
LT		 1385 ifa->ifa_local =
1386 ifa->ifa_address = htonl(INADDR_LOOPBACK);
1387 ifa->ifa_prefixlen = 8;
1388 ifa->ifa_mask = inet_make_mask(8);
1389 in_dev_hold(in_dev);
1390 ifa->ifa_dev = in_dev;
1391 ifa->ifa_scope = RT_SCOPE_HOST;
1392 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
5c766d64
JP		 1393 set_ifa_lifetime(ifa, INFINITY_LIFE_TIME,
1394 INFINITY_LIFE_TIME);
dfd1582d
JP		 1395 ipv4_devconf_setall(in_dev);
1396 neigh_parms_data_state_setall(in_dev->arp_parms);
1da177e4
LT		 1397 inet_insert_ifa(ifa);
1398 }
1399 }
1400 ip_mc_up(in_dev);
eefef1cf
SH		 1401 /* fall through */
1402 case NETDEV_CHANGEADDR:
d11327ad
IC		 1403 if (!IN_DEV_ARP_NOTIFY(in_dev))
1404 break;
1405 /* fall through */
1406 case NETDEV_NOTIFY_PEERS:
a21090cf 1407 /* Send gratuitous ARP to notify of link change */
d11327ad 1408 inetdev_send_gratuitous_arp(dev, in_dev);
1da177e4
LT		 1409 break;
1410 case NETDEV_DOWN:
1411 ip_mc_down(in_dev);
1412 break;
93d9b7d7 1413 case NETDEV_PRE_TYPE_CHANGE:
75c78500
MS		 1414 ip_mc_unmap(in_dev);
1415 break;
93d9b7d7 1416 case NETDEV_POST_TYPE_CHANGE:
75c78500
MS		 1417 ip_mc_remap(in_dev);
1418 break;
1da177e4 1419 case NETDEV_CHANGEMTU:
06770843 1420 if (inetdev_valid_mtu(dev->mtu))
1da177e4 1421 break;
06770843 1422 /* disable IP when MTU is not enough */
1da177e4
LT		 1423 case NETDEV_UNREGISTER:
1424 inetdev_destroy(in_dev);
1425 break;
1426 case NETDEV_CHANGENAME:
1427 /* Do not notify about label change, this event is
1428 * not interesting to applications using netlink.
1429 */
1430 inetdev_changename(dev, in_dev);
1431
51602b2a 1432 devinet_sysctl_unregister(in_dev);
66f27a52 1433 devinet_sysctl_register(in_dev);
1da177e4
LT		 1434 break;
1435 }
1436out:
1437 return NOTIFY_DONE;
1438}
1439
1440static struct notifier_block ip_netdev_notifier = {
539afedf 1441 .notifier_call = inetdev_event,
1da177e4
LT		 1442};
1443
40384999 1444static size_t inet_nlmsg_size(void)
339bf98f
TG		 1445{
1446 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
1447 + nla_total_size(4) /* IFA_ADDRESS */
1448 + nla_total_size(4) /* IFA_LOCAL */
1449 + nla_total_size(4) /* IFA_BROADCAST */
ad6c8135 1450 + nla_total_size(IFNAMSIZ) /* IFA_LABEL */
63b5f152
GU		 1451 + nla_total_size(4) /* IFA_FLAGS */
1452 + nla_total_size(sizeof(struct ifa_cacheinfo)); /* IFA_CACHEINFO */
339bf98f
TG		 1453}
1454
5c766d64
JP		 1455static inline u32 cstamp_delta(unsigned long cstamp)
1456{
1457 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
1458}
1459
1460static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
1461 unsigned long tstamp, u32 preferred, u32 valid)
1462{
1463 struct ifa_cacheinfo ci;
1464
1465 ci.cstamp = cstamp_delta(cstamp);
1466 ci.tstamp = cstamp_delta(tstamp);
1467 ci.ifa_prefered = preferred;
1468 ci.ifa_valid = valid;
1469
1470 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
1471}
1472
1da177e4 1473static int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa,
15e47304 1474 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4
LT		 1475{
1476 struct ifaddrmsg *ifm;
1477 struct nlmsghdr *nlh;
5c766d64 1478 u32 preferred, valid;
1da177e4 1479
15e47304 1480 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*ifm), flags);
47f68512 1481 if (nlh == NULL)
26932566 1482 return -EMSGSIZE;
47f68512
TG		 1483
1484 ifm = nlmsg_data(nlh);
1da177e4
LT		 1485 ifm->ifa_family = AF_INET;
1486 ifm->ifa_prefixlen = ifa->ifa_prefixlen;
5c766d64 1487 ifm->ifa_flags = ifa->ifa_flags;
1da177e4
LT		 1488 ifm->ifa_scope = ifa->ifa_scope;
1489 ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
47f68512 1490
5c766d64
JP		 1491 if (!(ifm->ifa_flags & IFA_F_PERMANENT)) {
1492 preferred = ifa->ifa_preferred_lft;
1493 valid = ifa->ifa_valid_lft;
1494 if (preferred != INFINITY_LIFE_TIME) {
1495 long tval = (jiffies - ifa->ifa_tstamp) / HZ;
1496
1497 if (preferred > tval)
1498 preferred -= tval;
1499 else
1500 preferred = 0;
1501 if (valid != INFINITY_LIFE_TIME) {
1502 if (valid > tval)
1503 valid -= tval;
1504 else
1505 valid = 0;
1506 }
1507 }
1508 } else {
1509 preferred = INFINITY_LIFE_TIME;
1510 valid = INFINITY_LIFE_TIME;
1511 }
f3756b79
DM		 1512 if ((ifa->ifa_address &&
1513 nla_put_be32(skb, IFA_ADDRESS, ifa->ifa_address)) ||
1514 (ifa->ifa_local &&
1515 nla_put_be32(skb, IFA_LOCAL, ifa->ifa_local)) ||
1516 (ifa->ifa_broadcast &&
1517 nla_put_be32(skb, IFA_BROADCAST, ifa->ifa_broadcast)) ||
1518 (ifa->ifa_label[0] &&
5c766d64 1519 nla_put_string(skb, IFA_LABEL, ifa->ifa_label)) ||
ad6c8135 1520 nla_put_u32(skb, IFA_FLAGS, ifa->ifa_flags) ||
5c766d64
JP		 1521 put_cacheinfo(skb, ifa->ifa_cstamp, ifa->ifa_tstamp,
1522 preferred, valid))
f3756b79 1523 goto nla_put_failure;
1da177e4 1524
053c095a
JB		 1525 nlmsg_end(skb, nlh);
1526 return 0;
47f68512
TG		 1527
1528nla_put_failure:
26932566
PM		 1529 nlmsg_cancel(skb, nlh);
1530 return -EMSGSIZE;
1da177e4
LT		 1531}
1532
1533static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
1534{
3b1e0a65 1535 struct net *net = sock_net(skb->sk);
eec4df98
ED		 1536 int h, s_h;
1537 int idx, s_idx;
1538 int ip_idx, s_ip_idx;
1da177e4
LT		 1539 struct net_device *dev;
1540 struct in_device *in_dev;
1541 struct in_ifaddr *ifa;
eec4df98 1542 struct hlist_head *head;
1da177e4 1543
eec4df98
ED		 1544 s_h = cb->args[0];
1545 s_idx = idx = cb->args[1];
1546 s_ip_idx = ip_idx = cb->args[2];
1547
1548 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1549 idx = 0;
1550 head = &net->dev_index_head[h];
1551 rcu_read_lock();
0465277f
ND		 1552 cb->seq = atomic_read(&net->ipv4.dev_addr_genid) ^
1553 net->dev_base_seq;
b67bfe0d 1554 hlist_for_each_entry_rcu(dev, head, index_hlist) {
eec4df98
ED		 1555 if (idx < s_idx)
1556 goto cont;
4b97efdf 1557 if (h > s_h || idx > s_idx)
eec4df98
ED		 1558 s_ip_idx = 0;
1559 in_dev = __in_dev_get_rcu(dev);
1560 if (!in_dev)
1561 goto cont;
1da177e4 1562
eec4df98
ED		 1563 for (ifa = in_dev->ifa_list, ip_idx = 0; ifa;
1564 ifa = ifa->ifa_next, ip_idx++) {
1565 if (ip_idx < s_ip_idx)
1566 continue;
1567 if (inet_fill_ifaddr(skb, ifa,
15e47304 1568 NETLINK_CB(cb->skb).portid,
1da177e4 1569 cb->nlh->nlmsg_seq,
053c095a 1570 RTM_NEWADDR, NLM_F_MULTI) < 0) {
eec4df98
ED		 1571 rcu_read_unlock();
1572 goto done;
1573 }
0465277f 1574 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
eec4df98 1575 }
7562f876 1576cont:
eec4df98
ED		 1577 idx++;
1578 }
1579 rcu_read_unlock();
1da177e4
LT		 1580 }
1581
1582done:
eec4df98
ED		 1583 cb->args[0] = h;
1584 cb->args[1] = idx;
1585 cb->args[2] = ip_idx;
1da177e4
LT		 1586
1587 return skb->len;
1588}
1589
539afedf 1590static void rtmsg_ifa(int event, struct in_ifaddr *ifa, struct nlmsghdr *nlh,
15e47304 1591 u32 portid)
1da177e4 1592{
47f68512 1593 struct sk_buff *skb;
d6062cbb
TG		 1594 u32 seq = nlh ? nlh->nlmsg_seq : 0;
1595 int err = -ENOBUFS;
4b8aa9ab 1596 struct net *net;
1da177e4 1597
c346dca1 1598 net = dev_net(ifa->ifa_dev->dev);
339bf98f 1599 skb = nlmsg_new(inet_nlmsg_size(), GFP_KERNEL);
47f68512 1600 if (skb == NULL)
d6062cbb
TG		 1601 goto errout;
1602
15e47304 1603 err = inet_fill_ifaddr(skb, ifa, portid, seq, event, 0);
26932566
PM		 1604 if (err < 0) {
1605 /* -EMSGSIZE implies BUG in inet_nlmsg_size() */
1606 WARN_ON(err == -EMSGSIZE);
1607 kfree_skb(skb);
1608 goto errout;
1609 }
15e47304 1610 rtnl_notify(skb, net, portid, RTNLGRP_IPV4_IFADDR, nlh, GFP_KERNEL);
1ce85fe4 1611 return;
d6062cbb
TG		 1612errout:
1613 if (err < 0)
4b8aa9ab 1614 rtnl_set_sk_err(net, RTNLGRP_IPV4_IFADDR, err);
1da177e4
LT		 1615}
1616
9f0f7272
TG		 1617static size_t inet_get_link_af_size(const struct net_device *dev)
1618{
1fc19aff 1619 struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr);
9f0f7272
TG		 1620
1621 if (!in_dev)
1622 return 0;
1623
1624 return nla_total_size(IPV4_DEVCONF_MAX * 4); /* IFLA_INET_CONF */
1625}
1626
1627static int inet_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
1628{
1fc19aff 1629 struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr);
9f0f7272
TG		 1630 struct nlattr *nla;
1631 int i;
1632
1633 if (!in_dev)
1634 return -ENODATA;
1635
1636 nla = nla_reserve(skb, IFLA_INET_CONF, IPV4_DEVCONF_MAX * 4);
1637 if (nla == NULL)
1638 return -EMSGSIZE;
1639
1640 for (i = 0; i < IPV4_DEVCONF_MAX; i++)
1641 ((u32 *) nla_data(nla))[i] = in_dev->cnf.data[i];
1642
1643 return 0;
1644}
1645
1646static const struct nla_policy inet_af_policy[IFLA_INET_MAX+1] = {
1647 [IFLA_INET_CONF] = { .type = NLA_NESTED },
1648};
1649
cf7afbfe
TG		 1650static int inet_validate_link_af(const struct net_device *dev,
1651 const struct nlattr *nla)
9f0f7272 1652{
9f0f7272
TG		 1653 struct nlattr *a, *tb[IFLA_INET_MAX+1];
1654 int err, rem;
1655
f7fce74e 1656 if (dev && !__in_dev_get_rtnl(dev))
cf7afbfe 1657 return -EAFNOSUPPORT;
9f0f7272
TG		 1658
1659 err = nla_parse_nested(tb, IFLA_INET_MAX, nla, inet_af_policy);
1660 if (err < 0)
1661 return err;
1662
1663 if (tb[IFLA_INET_CONF]) {
1664 nla_for_each_nested(a, tb[IFLA_INET_CONF], rem) {
1665 int cfgid = nla_type(a);
1666
1667 if (nla_len(a) < 4)
1668 return -EINVAL;
1669
1670 if (cfgid <= 0 || cfgid > IPV4_DEVCONF_MAX)
1671 return -EINVAL;
1672 }
1673 }
1674
cf7afbfe
TG		 1675 return 0;
1676}
1677
1678static int inet_set_link_af(struct net_device *dev, const struct nlattr *nla)
1679{
f7fce74e 1680 struct in_device *in_dev = __in_dev_get_rtnl(dev);
cf7afbfe
TG		 1681 struct nlattr *a, *tb[IFLA_INET_MAX+1];
1682 int rem;
1683
1684 if (!in_dev)
1685 return -EAFNOSUPPORT;
1686
1687 if (nla_parse_nested(tb, IFLA_INET_MAX, nla, NULL) < 0)
1688 BUG();
1689
9f0f7272
TG		 1690 if (tb[IFLA_INET_CONF]) {
1691 nla_for_each_nested(a, tb[IFLA_INET_CONF], rem)
1692 ipv4_devconf_set(in_dev, nla_type(a), nla_get_u32(a));
1693 }
1694
1695 return 0;
1696}
1697
edc9e748
ND		 1698static int inet_netconf_msgsize_devconf(int type)
1699{
1700 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
1701 + nla_total_size(4); /* NETCONFA_IFINDEX */
1702
9e551110
ND		 1703 /* type -1 is used for ALL */
1704 if (type == -1 || type == NETCONFA_FORWARDING)
edc9e748 1705 size += nla_total_size(4);
cc535dfb
ND		 1706 if (type == -1 || type == NETCONFA_RP_FILTER)
1707 size += nla_total_size(4);
d67b8c61
ND		 1708 if (type == -1 || type == NETCONFA_MC_FORWARDING)
1709 size += nla_total_size(4);
09aea5df 1710 if (type == -1 || type == NETCONFA_PROXY_NEIGH)
f085ff1c 1711 size += nla_total_size(4);
edc9e748
ND		 1712
1713 return size;
1714}
1715
1716static int inet_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
1717 struct ipv4_devconf *devconf, u32 portid,
1718 u32 seq, int event, unsigned int flags,
1719 int type)
1720{
1721 struct nlmsghdr *nlh;
1722 struct netconfmsg *ncm;
1723
1724 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
1725 flags);
1726 if (nlh == NULL)
1727 return -EMSGSIZE;
1728
1729 ncm = nlmsg_data(nlh);
1730 ncm->ncm_family = AF_INET;
1731
1732 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
1733 goto nla_put_failure;
1734
9e551110
ND		 1735 /* type -1 is used for ALL */
1736 if ((type == -1 || type == NETCONFA_FORWARDING) &&
edc9e748
ND		 1737 nla_put_s32(skb, NETCONFA_FORWARDING,
1738 IPV4_DEVCONF(*devconf, FORWARDING)) < 0)
1739 goto nla_put_failure;
cc535dfb
ND		 1740 if ((type == -1 || type == NETCONFA_RP_FILTER) &&
1741 nla_put_s32(skb, NETCONFA_RP_FILTER,
1742 IPV4_DEVCONF(*devconf, RP_FILTER)) < 0)
1743 goto nla_put_failure;
d67b8c61
ND		 1744 if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
1745 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
1746 IPV4_DEVCONF(*devconf, MC_FORWARDING)) < 0)
1747 goto nla_put_failure;
09aea5df 1748 if ((type == -1 || type == NETCONFA_PROXY_NEIGH) &&
1749 nla_put_s32(skb, NETCONFA_PROXY_NEIGH,
f085ff1c 1750 IPV4_DEVCONF(*devconf, PROXY_ARP)) < 0)
1751 goto nla_put_failure;
edc9e748 1752
053c095a
JB		 1753 nlmsg_end(skb, nlh);
1754 return 0;
edc9e748
ND		 1755
1756nla_put_failure:
1757 nlmsg_cancel(skb, nlh);
1758 return -EMSGSIZE;
1759}
1760
d67b8c61
ND		 1761void inet_netconf_notify_devconf(struct net *net, int type, int ifindex,
1762 struct ipv4_devconf *devconf)
edc9e748
ND		 1763{
1764 struct sk_buff *skb;
1765 int err = -ENOBUFS;
1766
1767 skb = nlmsg_new(inet_netconf_msgsize_devconf(type), GFP_ATOMIC);
1768 if (skb == NULL)
1769 goto errout;
1770
1771 err = inet_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
1772 RTM_NEWNETCONF, 0, type);
1773 if (err < 0) {
1774 /* -EMSGSIZE implies BUG in inet_netconf_msgsize_devconf() */
1775 WARN_ON(err == -EMSGSIZE);
1776 kfree_skb(skb);
1777 goto errout;
1778 }
1779 rtnl_notify(skb, net, 0, RTNLGRP_IPV4_NETCONF, NULL, GFP_ATOMIC);
1780 return;
1781errout:
1782 if (err < 0)
1783 rtnl_set_sk_err(net, RTNLGRP_IPV4_NETCONF, err);
1784}
1785
9e551110
ND		 1786static const struct nla_policy devconf_ipv4_policy[NETCONFA_MAX+1] = {
1787 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
1788 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
cc535dfb 1789 [NETCONFA_RP_FILTER] = { .len = sizeof(int) },
09aea5df 1790 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
9e551110
ND		 1791};
1792
1793static int inet_netconf_get_devconf(struct sk_buff *in_skb,
661d2967 1794 struct nlmsghdr *nlh)
9e551110
ND		 1795{
1796 struct net *net = sock_net(in_skb->sk);
1797 struct nlattr *tb[NETCONFA_MAX+1];
1798 struct netconfmsg *ncm;
1799 struct sk_buff *skb;
1800 struct ipv4_devconf *devconf;
1801 struct in_device *in_dev;
1802 struct net_device *dev;
1803 int ifindex;
1804 int err;
1805
1806 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
1807 devconf_ipv4_policy);
1808 if (err < 0)
1809 goto errout;
1810
1811 err = EINVAL;
1812 if (!tb[NETCONFA_IFINDEX])
1813 goto errout;
1814
1815 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
1816 switch (ifindex) {
1817 case NETCONFA_IFINDEX_ALL:
1818 devconf = net->ipv4.devconf_all;
1819 break;
1820 case NETCONFA_IFINDEX_DEFAULT:
1821 devconf = net->ipv4.devconf_dflt;
1822 break;
1823 default:
1824 dev = __dev_get_by_index(net, ifindex);
1825 if (dev == NULL)
1826 goto errout;
1827 in_dev = __in_dev_get_rtnl(dev);
1828 if (in_dev == NULL)
1829 goto errout;
1830 devconf = &in_dev->cnf;
1831 break;
1832 }
1833
1834 err = -ENOBUFS;
1835 skb = nlmsg_new(inet_netconf_msgsize_devconf(-1), GFP_ATOMIC);
1836 if (skb == NULL)
1837 goto errout;
1838
1839 err = inet_netconf_fill_devconf(skb, ifindex, devconf,
1840 NETLINK_CB(in_skb).portid,
1841 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
1842 -1);
1843 if (err < 0) {
1844 /* -EMSGSIZE implies BUG in inet_netconf_msgsize_devconf() */
1845 WARN_ON(err == -EMSGSIZE);
1846 kfree_skb(skb);
1847 goto errout;
1848 }
1849 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
1850errout:
1851 return err;
1852}
1853
7a674200
ND		 1854static int inet_netconf_dump_devconf(struct sk_buff *skb,
1855 struct netlink_callback *cb)
1856{
1857 struct net *net = sock_net(skb->sk);
1858 int h, s_h;
1859 int idx, s_idx;
1860 struct net_device *dev;
1861 struct in_device *in_dev;
1862 struct hlist_head *head;
1863
1864 s_h = cb->args[0];
1865 s_idx = idx = cb->args[1];
1866
1867 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1868 idx = 0;
1869 head = &net->dev_index_head[h];
1870 rcu_read_lock();
0465277f
ND		 1871 cb->seq = atomic_read(&net->ipv4.dev_addr_genid) ^
1872 net->dev_base_seq;
7a674200
ND		 1873 hlist_for_each_entry_rcu(dev, head, index_hlist) {
1874 if (idx < s_idx)
1875 goto cont;
1876 in_dev = __in_dev_get_rcu(dev);
1877 if (!in_dev)
1878 goto cont;
1879
1880 if (inet_netconf_fill_devconf(skb, dev->ifindex,
1881 &in_dev->cnf,
1882 NETLINK_CB(cb->skb).portid,
1883 cb->nlh->nlmsg_seq,
1884 RTM_NEWNETCONF,
1885 NLM_F_MULTI,
1886 -1) <= 0) {
1887 rcu_read_unlock();
1888 goto done;
1889 }
0465277f 1890 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7a674200
ND		 1891cont:
1892 idx++;
1893 }
1894 rcu_read_unlock();
1895 }
1896 if (h == NETDEV_HASHENTRIES) {
1897 if (inet_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
1898 net->ipv4.devconf_all,
1899 NETLINK_CB(cb->skb).portid,
1900 cb->nlh->nlmsg_seq,
1901 RTM_NEWNETCONF, NLM_F_MULTI,
1902 -1) <= 0)
1903 goto done;
1904 else
1905 h++;
1906 }
1907 if (h == NETDEV_HASHENTRIES + 1) {
1908 if (inet_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
1909 net->ipv4.devconf_dflt,
1910 NETLINK_CB(cb->skb).portid,
1911 cb->nlh->nlmsg_seq,
1912 RTM_NEWNETCONF, NLM_F_MULTI,
1913 -1) <= 0)
1914 goto done;
1915 else
1916 h++;
1917 }
1918done:
1919 cb->args[0] = h;
1920 cb->args[1] = idx;
1921
1922 return skb->len;
1923}
1924
1da177e4
LT		 1925#ifdef CONFIG_SYSCTL
1926
c0ce9fb3 1927static void devinet_copy_dflt_conf(struct net *net, int i)
31be3085
HX		 1928{
1929 struct net_device *dev;
1930
c6d14c84
ED		 1931 rcu_read_lock();
1932 for_each_netdev_rcu(net, dev) {
31be3085 1933 struct in_device *in_dev;
c6d14c84 1934
31be3085
HX		 1935 in_dev = __in_dev_get_rcu(dev);
1936 if (in_dev && !test_bit(i, in_dev->cnf.state))
9355bbd6 1937 in_dev->cnf.data[i] = net->ipv4.devconf_dflt->data[i];
31be3085 1938 }
c6d14c84 1939 rcu_read_unlock();
31be3085
HX		 1940}
1941
c6d14c84 1942/* called with RTNL locked */
c0ce9fb3 1943static void inet_forward_change(struct net *net)
68dd299b
PE		 1944{
1945 struct net_device *dev;
586f1211 1946 int on = IPV4_DEVCONF_ALL(net, FORWARDING);
68dd299b 1947
586f1211 1948 IPV4_DEVCONF_ALL(net, ACCEPT_REDIRECTS) = !on;
9355bbd6 1949 IPV4_DEVCONF_DFLT(net, FORWARDING) = on;
edc9e748
ND		 1950 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING,
1951 NETCONFA_IFINDEX_ALL,
1952 net->ipv4.devconf_all);
1953 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING,
1954 NETCONFA_IFINDEX_DEFAULT,
1955 net->ipv4.devconf_dflt);
68dd299b 1956
c0ce9fb3 1957 for_each_netdev(net, dev) {
68dd299b 1958 struct in_device *in_dev;
0187bdfb
BH		 1959 if (on)
1960 dev_disable_lro(dev);
68dd299b
PE		 1961 rcu_read_lock();
1962 in_dev = __in_dev_get_rcu(dev);
edc9e748 1963 if (in_dev) {
68dd299b 1964 IN_DEV_CONF_SET(in_dev, FORWARDING, on);
edc9e748
ND		 1965 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING,
1966 dev->ifindex, &in_dev->cnf);
1967 }
68dd299b
PE		 1968 rcu_read_unlock();
1969 }
68dd299b
PE		 1970}
1971
f085ff1c 1972static int devinet_conf_ifindex(struct net *net, struct ipv4_devconf *cnf)
1973{
1974 if (cnf == net->ipv4.devconf_dflt)
1975 return NETCONFA_IFINDEX_DEFAULT;
1976 else if (cnf == net->ipv4.devconf_all)
1977 return NETCONFA_IFINDEX_ALL;
1978 else {
1979 struct in_device *idev
1980 = container_of(cnf, struct in_device, cnf);
1981 return idev->dev->ifindex;
1982 }
1983}
1984
fe2c6338 1985static int devinet_conf_proc(struct ctl_table *ctl, int write,
8d65af78 1986 void __user *buffer,
31be3085
HX		 1987 size_t *lenp, loff_t *ppos)
1988{
d01ff0a0 1989 int old_value = *(int *)ctl->data;
8d65af78 1990 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
d01ff0a0 1991 int new_value = *(int *)ctl->data;
31be3085
HX		 1992
1993 if (write) {
1994 struct ipv4_devconf *cnf = ctl->extra1;
c0ce9fb3 1995 struct net *net = ctl->extra2;
31be3085 1996 int i = (int *)ctl->data - cnf->data;
f085ff1c 1997 int ifindex;
31be3085
HX		 1998
1999 set_bit(i, cnf->state);
2000
9355bbd6 2001 if (cnf == net->ipv4.devconf_dflt)
c0ce9fb3 2002 devinet_copy_dflt_conf(net, i);
d0daebc3
TG		 2003 if (i == IPV4_DEVCONF_ACCEPT_LOCAL - 1 ||
2004 i == IPV4_DEVCONF_ROUTE_LOCALNET - 1)
d01ff0a0 2005 if ((new_value == 0) && (old_value != 0))
4ccfe6d4 2006 rt_cache_flush(net);
f085ff1c 2007
cc535dfb
ND		 2008 if (i == IPV4_DEVCONF_RP_FILTER - 1 &&
2009 new_value != old_value) {
f085ff1c 2010 ifindex = devinet_conf_ifindex(net, cnf);
cc535dfb
ND		 2011 inet_netconf_notify_devconf(net, NETCONFA_RP_FILTER,
2012 ifindex, cnf);
2013 }
f085ff1c 2014 if (i == IPV4_DEVCONF_PROXY_ARP - 1 &&
2015 new_value != old_value) {
2016 ifindex = devinet_conf_ifindex(net, cnf);
09aea5df 2017 inet_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
f085ff1c 2018 ifindex, cnf);
2019 }
31be3085
HX		 2020 }
2021
2022 return ret;
2023}
2024
fe2c6338 2025static int devinet_sysctl_forward(struct ctl_table *ctl, int write,
8d65af78 2026 void __user *buffer,
1da177e4
LT		 2027 size_t *lenp, loff_t *ppos)
2028{
2029 int *valp = ctl->data;
2030 int val = *valp;
88af182e 2031 loff_t pos = *ppos;
8d65af78 2032 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
1da177e4
LT		 2033
2034 if (write && *valp != val) {
c0ce9fb3
PE		 2035 struct net *net = ctl->extra2;
2036
0187bdfb 2037 if (valp != &IPV4_DEVCONF_DFLT(net, FORWARDING)) {
88af182e
EB		 2038 if (!rtnl_trylock()) {
2039 /* Restore the original values before restarting */
2040 *valp = val;
2041 *ppos = pos;
9b8adb5e 2042 return restart_syscall();
88af182e 2043 }
0187bdfb
BH		 2044 if (valp == &IPV4_DEVCONF_ALL(net, FORWARDING)) {
2045 inet_forward_change(net);
edc9e748 2046 } else {
0187bdfb
BH		 2047 struct ipv4_devconf *cnf = ctl->extra1;
2048 struct in_device *idev =
2049 container_of(cnf, struct in_device, cnf);
edc9e748
ND		 2050 if (*valp)
2051 dev_disable_lro(idev->dev);
2052 inet_netconf_notify_devconf(net,
2053 NETCONFA_FORWARDING,
2054 idev->dev->ifindex,
2055 cnf);
0187bdfb
BH		 2056 }
2057 rtnl_unlock();
4ccfe6d4 2058 rt_cache_flush(net);
edc9e748
ND		 2059 } else
2060 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING,
2061 NETCONFA_IFINDEX_DEFAULT,
2062 net->ipv4.devconf_dflt);
1da177e4
LT		 2063 }
2064
2065 return ret;
2066}
2067
fe2c6338 2068static int ipv4_doint_and_flush(struct ctl_table *ctl, int write,
323e126f
DM		 2069 void __user *buffer,
2070 size_t *lenp, loff_t *ppos)
1da177e4
LT		 2071{
2072 int *valp = ctl->data;
2073 int val = *valp;
8d65af78 2074 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
76e6ebfb 2075 struct net *net = ctl->extra2;
1da177e4
LT		 2076
2077 if (write && *valp != val)
4ccfe6d4 2078 rt_cache_flush(net);
1da177e4
LT		 2079
2080 return ret;
2081}
2082
f8572d8f 2083#define DEVINET_SYSCTL_ENTRY(attr, name, mval, proc) \
42f811b8 2084 { \
42f811b8
HX		 2085 .procname = name, \
2086 .data = ipv4_devconf.data + \
02291680 2087 IPV4_DEVCONF_ ## attr - 1, \
42f811b8
HX		 2088 .maxlen = sizeof(int), \
2089 .mode = mval, \
2090 .proc_handler = proc, \
31be3085 2091 .extra1 = &ipv4_devconf, \
42f811b8
HX		 2092 }
2093
2094#define DEVINET_SYSCTL_RW_ENTRY(attr, name) \
f8572d8f 2095 DEVINET_SYSCTL_ENTRY(attr, name, 0644, devinet_conf_proc)
42f811b8
HX		 2096
2097#define DEVINET_SYSCTL_RO_ENTRY(attr, name) \
f8572d8f 2098 DEVINET_SYSCTL_ENTRY(attr, name, 0444, devinet_conf_proc)
42f811b8 2099
f8572d8f
EB		 2100#define DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, proc) \
2101 DEVINET_SYSCTL_ENTRY(attr, name, 0644, proc)
42f811b8
HX		 2102
2103#define DEVINET_SYSCTL_FLUSHING_ENTRY(attr, name) \
f8572d8f 2104 DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, ipv4_doint_and_flush)
42f811b8 2105
1da177e4
LT		 2106static struct devinet_sysctl_table {
2107 struct ctl_table_header *sysctl_header;
02291680 2108 struct ctl_table devinet_vars[__IPV4_DEVCONF_MAX];
1da177e4
LT		 2109} devinet_sysctl = {
2110 .devinet_vars = {
42f811b8 2111 DEVINET_SYSCTL_COMPLEX_ENTRY(FORWARDING, "forwarding",
f8572d8f 2112 devinet_sysctl_forward),
42f811b8
HX		 2113 DEVINET_SYSCTL_RO_ENTRY(MC_FORWARDING, "mc_forwarding"),
2114
2115 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_REDIRECTS, "accept_redirects"),
2116 DEVINET_SYSCTL_RW_ENTRY(SECURE_REDIRECTS, "secure_redirects"),
2117 DEVINET_SYSCTL_RW_ENTRY(SHARED_MEDIA, "shared_media"),
2118 DEVINET_SYSCTL_RW_ENTRY(RP_FILTER, "rp_filter"),
2119 DEVINET_SYSCTL_RW_ENTRY(SEND_REDIRECTS, "send_redirects"),
2120 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_SOURCE_ROUTE,
2121 "accept_source_route"),
8153a10c 2122 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_LOCAL, "accept_local"),
28f6aeea 2123 DEVINET_SYSCTL_RW_ENTRY(SRC_VMARK, "src_valid_mark"),
42f811b8
HX		 2124 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP, "proxy_arp"),
2125 DEVINET_SYSCTL_RW_ENTRY(MEDIUM_ID, "medium_id"),
2126 DEVINET_SYSCTL_RW_ENTRY(BOOTP_RELAY, "bootp_relay"),
2127 DEVINET_SYSCTL_RW_ENTRY(LOG_MARTIANS, "log_martians"),
2128 DEVINET_SYSCTL_RW_ENTRY(TAG, "tag"),
2129 DEVINET_SYSCTL_RW_ENTRY(ARPFILTER, "arp_filter"),
2130 DEVINET_SYSCTL_RW_ENTRY(ARP_ANNOUNCE, "arp_announce"),
2131 DEVINET_SYSCTL_RW_ENTRY(ARP_IGNORE, "arp_ignore"),
2132 DEVINET_SYSCTL_RW_ENTRY(ARP_ACCEPT, "arp_accept"),
eefef1cf 2133 DEVINET_SYSCTL_RW_ENTRY(ARP_NOTIFY, "arp_notify"),
65324144 2134 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP_PVLAN, "proxy_arp_pvlan"),
5c6fe01c
WM		 2135 DEVINET_SYSCTL_RW_ENTRY(FORCE_IGMP_VERSION,
2136 "force_igmp_version"),
2690048c
WM		 2137 DEVINET_SYSCTL_RW_ENTRY(IGMPV2_UNSOLICITED_REPORT_INTERVAL,
2138 "igmpv2_unsolicited_report_interval"),
2139 DEVINET_SYSCTL_RW_ENTRY(IGMPV3_UNSOLICITED_REPORT_INTERVAL,
2140 "igmpv3_unsolicited_report_interval"),
42f811b8
HX		 2141
2142 DEVINET_SYSCTL_FLUSHING_ENTRY(NOXFRM, "disable_xfrm"),
2143 DEVINET_SYSCTL_FLUSHING_ENTRY(NOPOLICY, "disable_policy"),
42f811b8
HX		 2144 DEVINET_SYSCTL_FLUSHING_ENTRY(PROMOTE_SECONDARIES,
2145 "promote_secondaries"),
d0daebc3
TG		 2146 DEVINET_SYSCTL_FLUSHING_ENTRY(ROUTE_LOCALNET,
2147 "route_localnet"),
1da177e4 2148 },
1da177e4
LT		 2149};
2150
ea40b324 2151static int __devinet_sysctl_register(struct net *net, char *dev_name,
f8572d8f 2152 struct ipv4_devconf *p)
1da177e4
LT		 2153{
2154 int i;
9fa89642 2155 struct devinet_sysctl_table *t;
8607ddb8 2156 char path[sizeof("net/ipv4/conf/") + IFNAMSIZ];
bfada697 2157
9fa89642 2158 t = kmemdup(&devinet_sysctl, sizeof(*t), GFP_KERNEL);
1da177e4 2159 if (!t)
9fa89642
PE		 2160 goto out;
2161
1da177e4
LT		 2162 for (i = 0; i < ARRAY_SIZE(t->devinet_vars) - 1; i++) {
2163 t->devinet_vars[i].data += (char *)p - (char *)&ipv4_devconf;
31be3085 2164 t->devinet_vars[i].extra1 = p;
c0ce9fb3 2165 t->devinet_vars[i].extra2 = net;
1da177e4
LT		 2166 }
2167
8607ddb8 2168 snprintf(path, sizeof(path), "net/ipv4/conf/%s", dev_name);
1da177e4 2169
8607ddb8 2170 t->sysctl_header = register_net_sysctl(net, path, t->devinet_vars);
1da177e4 2171 if (!t->sysctl_header)
8607ddb8 2172 goto free;
1da177e4
LT		 2173
2174 p->sysctl = t;
ea40b324 2175 return 0;
1da177e4 2176
9fa89642 2177free:
1da177e4 2178 kfree(t);
9fa89642 2179out:
ea40b324 2180 return -ENOBUFS;
1da177e4
LT		 2181}
2182
51602b2a
PE		 2183static void __devinet_sysctl_unregister(struct ipv4_devconf *cnf)
2184{
2185 struct devinet_sysctl_table *t = cnf->sysctl;
2186
2187 if (t == NULL)
2188 return;
2189
2190 cnf->sysctl = NULL;
ff538818 2191 unregister_net_sysctl_table(t->sysctl_header);
51602b2a
PE		 2192 kfree(t);
2193}
2194
20e61da7 2195static int devinet_sysctl_register(struct in_device *idev)
66f27a52 2196{
20e61da7
WC		 2197 int err;
2198
2199 if (!sysctl_dev_name_is_allowed(idev->dev->name))
2200 return -EINVAL;
2201
2202 err = neigh_sysctl_register(idev->dev, idev->arp_parms, NULL);
2203 if (err)
2204 return err;
2205 err = __devinet_sysctl_register(dev_net(idev->dev), idev->dev->name,
f8572d8f 2206 &idev->cnf);
20e61da7
WC		 2207 if (err)
2208 neigh_sysctl_unregister(idev->arp_parms);
2209 return err;
66f27a52
PE		 2210}
2211
51602b2a 2212static void devinet_sysctl_unregister(struct in_device *idev)
1da177e4 2213{
51602b2a
PE		 2214 __devinet_sysctl_unregister(&idev->cnf);
2215 neigh_sysctl_unregister(idev->arp_parms);
1da177e4 2216}
1da177e4 2217
68dd299b
PE		 2218static struct ctl_table ctl_forward_entry[] = {
2219 {
68dd299b
PE		 2220 .procname = "ip_forward",
2221 .data = &ipv4_devconf.data[
02291680 2222 IPV4_DEVCONF_FORWARDING - 1],
68dd299b
PE		 2223 .maxlen = sizeof(int),
2224 .mode = 0644,
2225 .proc_handler = devinet_sysctl_forward,
68dd299b 2226 .extra1 = &ipv4_devconf,
c0ce9fb3 2227 .extra2 = &init_net,
68dd299b
PE		 2228 },
2229 { },
2230};
2a75de0c 2231#endif
68dd299b 2232
752d14dc
PE		 2233static __net_init int devinet_init_net(struct net *net)
2234{
2235 int err;
752d14dc 2236 struct ipv4_devconf *all, *dflt;
2a75de0c
ED		 2237#ifdef CONFIG_SYSCTL
2238 struct ctl_table *tbl = ctl_forward_entry;
752d14dc 2239 struct ctl_table_header *forw_hdr;
2a75de0c 2240#endif
752d14dc
PE		 2241
2242 err = -ENOMEM;
2243 all = &ipv4_devconf;
2244 dflt = &ipv4_devconf_dflt;
752d14dc 2245
09ad9bc7 2246 if (!net_eq(net, &init_net)) {
752d14dc
PE		 2247 all = kmemdup(all, sizeof(ipv4_devconf), GFP_KERNEL);
2248 if (all == NULL)
2249 goto err_alloc_all;
2250
2251 dflt = kmemdup(dflt, sizeof(ipv4_devconf_dflt), GFP_KERNEL);
2252 if (dflt == NULL)
2253 goto err_alloc_dflt;
2254
2a75de0c 2255#ifdef CONFIG_SYSCTL
752d14dc
PE		 2256 tbl = kmemdup(tbl, sizeof(ctl_forward_entry), GFP_KERNEL);
2257 if (tbl == NULL)
2258 goto err_alloc_ctl;
2259
02291680 2260 tbl[0].data = &all->data[IPV4_DEVCONF_FORWARDING - 1];
752d14dc
PE		 2261 tbl[0].extra1 = all;
2262 tbl[0].extra2 = net;
2a75de0c 2263#endif
752d14dc
PE		 2264 }
2265
2266#ifdef CONFIG_SYSCTL
f8572d8f 2267 err = __devinet_sysctl_register(net, "all", all);
752d14dc
PE		 2268 if (err < 0)
2269 goto err_reg_all;
2270
f8572d8f 2271 err = __devinet_sysctl_register(net, "default", dflt);
752d14dc
PE		 2272 if (err < 0)
2273 goto err_reg_dflt;
2274
2275 err = -ENOMEM;
8607ddb8 2276 forw_hdr = register_net_sysctl(net, "net/ipv4", tbl);
752d14dc
PE		 2277 if (forw_hdr == NULL)
2278 goto err_reg_ctl;
2a75de0c 2279 net->ipv4.forw_hdr = forw_hdr;
752d14dc
PE		 2280#endif
2281
752d14dc
PE		 2282 net->ipv4.devconf_all = all;
2283 net->ipv4.devconf_dflt = dflt;
2284 return 0;
2285
2286#ifdef CONFIG_SYSCTL
2287err_reg_ctl:
2288 __devinet_sysctl_unregister(dflt);
2289err_reg_dflt:
2290 __devinet_sysctl_unregister(all);
2291err_reg_all:
2292 if (tbl != ctl_forward_entry)
2293 kfree(tbl);
752d14dc 2294err_alloc_ctl:
2a75de0c 2295#endif
752d14dc
PE		 2296 if (dflt != &ipv4_devconf_dflt)
2297 kfree(dflt);
2298err_alloc_dflt:
2299 if (all != &ipv4_devconf)
2300 kfree(all);
2301err_alloc_all:
2302 return err;
2303}
2304
2305static __net_exit void devinet_exit_net(struct net *net)
2306{
2a75de0c 2307#ifdef CONFIG_SYSCTL
752d14dc
PE		 2308 struct ctl_table *tbl;
2309
2310 tbl = net->ipv4.forw_hdr->ctl_table_arg;
752d14dc
PE		 2311 unregister_net_sysctl_table(net->ipv4.forw_hdr);
2312 __devinet_sysctl_unregister(net->ipv4.devconf_dflt);
2313 __devinet_sysctl_unregister(net->ipv4.devconf_all);
752d14dc 2314 kfree(tbl);
2a75de0c 2315#endif
752d14dc
PE		 2316 kfree(net->ipv4.devconf_dflt);
2317 kfree(net->ipv4.devconf_all);
2318}
2319
2320static __net_initdata struct pernet_operations devinet_ops = {
2321 .init = devinet_init_net,
2322 .exit = devinet_exit_net,
2323};
2324
9f0f7272
TG		 2325static struct rtnl_af_ops inet_af_ops = {
2326 .family = AF_INET,
2327 .fill_link_af = inet_fill_link_af,
2328 .get_link_af_size = inet_get_link_af_size,
cf7afbfe
TG		 2329 .validate_link_af = inet_validate_link_af,
2330 .set_link_af = inet_set_link_af,
9f0f7272
TG		 2331};
2332
1da177e4
LT		 2333void __init devinet_init(void)
2334{
fd23c3b3
DM		 2335 int i;
2336
2337 for (i = 0; i < IN4_ADDR_HSIZE; i++)
2338 INIT_HLIST_HEAD(&inet_addr_lst[i]);
2339
752d14dc
PE		 2340 register_pernet_subsys(&devinet_ops);
2341
1da177e4
LT		 2342 register_gifconf(PF_INET, inet_gifconf);
2343 register_netdevice_notifier(&ip_netdev_notifier);
63f3444f 2344
906e073f 2345 queue_delayed_work(system_power_efficient_wq, &check_lifetime_work, 0);
5c766d64 2346
9f0f7272
TG		 2347 rtnl_af_register(&inet_af_ops);
2348
c7ac8679
GR		 2349 rtnl_register(PF_INET, RTM_NEWADDR, inet_rtm_newaddr, NULL, NULL);
2350 rtnl_register(PF_INET, RTM_DELADDR, inet_rtm_deladdr, NULL, NULL);
2351 rtnl_register(PF_INET, RTM_GETADDR, NULL, inet_dump_ifaddr, NULL);
9e551110 2352 rtnl_register(PF_INET, RTM_GETNETCONF, inet_netconf_get_devconf,
7a674200 2353 inet_netconf_dump_devconf, NULL);
1da177e4
LT		 2354}
2355
Linux 6.x block layer and io_uring tree(s)