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coresight: fix comment in of_coresight.c
[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
47f68512
TG		 1525 return nlmsg_end(skb, nlh);
1526
1527nla_put_failure:
26932566
PM		 1528 nlmsg_cancel(skb, nlh);
1529 return -EMSGSIZE;
1da177e4
LT		 1530}
1531
1532static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
1533{
3b1e0a65 1534 struct net *net = sock_net(skb->sk);
eec4df98
ED		 1535 int h, s_h;
1536 int idx, s_idx;
1537 int ip_idx, s_ip_idx;
1da177e4
LT		 1538 struct net_device *dev;
1539 struct in_device *in_dev;
1540 struct in_ifaddr *ifa;
eec4df98 1541 struct hlist_head *head;
1da177e4 1542
eec4df98
ED		 1543 s_h = cb->args[0];
1544 s_idx = idx = cb->args[1];
1545 s_ip_idx = ip_idx = cb->args[2];
1546
1547 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1548 idx = 0;
1549 head = &net->dev_index_head[h];
1550 rcu_read_lock();
0465277f
ND		 1551 cb->seq = atomic_read(&net->ipv4.dev_addr_genid) ^
1552 net->dev_base_seq;
b67bfe0d 1553 hlist_for_each_entry_rcu(dev, head, index_hlist) {
eec4df98
ED		 1554 if (idx < s_idx)
1555 goto cont;
4b97efdf 1556 if (h > s_h || idx > s_idx)
eec4df98
ED		 1557 s_ip_idx = 0;
1558 in_dev = __in_dev_get_rcu(dev);
1559 if (!in_dev)
1560 goto cont;
1da177e4 1561
eec4df98
ED		 1562 for (ifa = in_dev->ifa_list, ip_idx = 0; ifa;
1563 ifa = ifa->ifa_next, ip_idx++) {
1564 if (ip_idx < s_ip_idx)
1565 continue;
1566 if (inet_fill_ifaddr(skb, ifa,
15e47304 1567 NETLINK_CB(cb->skb).portid,
1da177e4 1568 cb->nlh->nlmsg_seq,
eec4df98
ED		 1569 RTM_NEWADDR, NLM_F_MULTI) <= 0) {
1570 rcu_read_unlock();
1571 goto done;
1572 }
0465277f 1573 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
eec4df98 1574 }
7562f876 1575cont:
eec4df98
ED		 1576 idx++;
1577 }
1578 rcu_read_unlock();
1da177e4
LT		 1579 }
1580
1581done:
eec4df98
ED		 1582 cb->args[0] = h;
1583 cb->args[1] = idx;
1584 cb->args[2] = ip_idx;
1da177e4
LT		 1585
1586 return skb->len;
1587}
1588
539afedf 1589static void rtmsg_ifa(int event, struct in_ifaddr *ifa, struct nlmsghdr *nlh,
15e47304 1590 u32 portid)
1da177e4 1591{
47f68512 1592 struct sk_buff *skb;
d6062cbb
TG		 1593 u32 seq = nlh ? nlh->nlmsg_seq : 0;
1594 int err = -ENOBUFS;
4b8aa9ab 1595 struct net *net;
1da177e4 1596
c346dca1 1597 net = dev_net(ifa->ifa_dev->dev);
339bf98f 1598 skb = nlmsg_new(inet_nlmsg_size(), GFP_KERNEL);
47f68512 1599 if (skb == NULL)
d6062cbb
TG		 1600 goto errout;
1601
15e47304 1602 err = inet_fill_ifaddr(skb, ifa, portid, seq, event, 0);
26932566
PM		 1603 if (err < 0) {
1604 /* -EMSGSIZE implies BUG in inet_nlmsg_size() */
1605 WARN_ON(err == -EMSGSIZE);
1606 kfree_skb(skb);
1607 goto errout;
1608 }
15e47304 1609 rtnl_notify(skb, net, portid, RTNLGRP_IPV4_IFADDR, nlh, GFP_KERNEL);
1ce85fe4 1610 return;
d6062cbb
TG		 1611errout:
1612 if (err < 0)
4b8aa9ab 1613 rtnl_set_sk_err(net, RTNLGRP_IPV4_IFADDR, err);
1da177e4
LT		 1614}
1615
9f0f7272
TG		 1616static size_t inet_get_link_af_size(const struct net_device *dev)
1617{
1fc19aff 1618 struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr);
9f0f7272
TG		 1619
1620 if (!in_dev)
1621 return 0;
1622
1623 return nla_total_size(IPV4_DEVCONF_MAX * 4); /* IFLA_INET_CONF */
1624}
1625
1626static int inet_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
1627{
1fc19aff 1628 struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr);
9f0f7272
TG		 1629 struct nlattr *nla;
1630 int i;
1631
1632 if (!in_dev)
1633 return -ENODATA;
1634
1635 nla = nla_reserve(skb, IFLA_INET_CONF, IPV4_DEVCONF_MAX * 4);
1636 if (nla == NULL)
1637 return -EMSGSIZE;
1638
1639 for (i = 0; i < IPV4_DEVCONF_MAX; i++)
1640 ((u32 *) nla_data(nla))[i] = in_dev->cnf.data[i];
1641
1642 return 0;
1643}
1644
1645static const struct nla_policy inet_af_policy[IFLA_INET_MAX+1] = {
1646 [IFLA_INET_CONF] = { .type = NLA_NESTED },
1647};
1648
cf7afbfe
TG		 1649static int inet_validate_link_af(const struct net_device *dev,
1650 const struct nlattr *nla)
9f0f7272 1651{
9f0f7272
TG		 1652 struct nlattr *a, *tb[IFLA_INET_MAX+1];
1653 int err, rem;
1654
f7fce74e 1655 if (dev && !__in_dev_get_rtnl(dev))
cf7afbfe 1656 return -EAFNOSUPPORT;
9f0f7272
TG		 1657
1658 err = nla_parse_nested(tb, IFLA_INET_MAX, nla, inet_af_policy);
1659 if (err < 0)
1660 return err;
1661
1662 if (tb[IFLA_INET_CONF]) {
1663 nla_for_each_nested(a, tb[IFLA_INET_CONF], rem) {
1664 int cfgid = nla_type(a);
1665
1666 if (nla_len(a) < 4)
1667 return -EINVAL;
1668
1669 if (cfgid <= 0 || cfgid > IPV4_DEVCONF_MAX)
1670 return -EINVAL;
1671 }
1672 }
1673
cf7afbfe
TG		 1674 return 0;
1675}
1676
1677static int inet_set_link_af(struct net_device *dev, const struct nlattr *nla)
1678{
f7fce74e 1679 struct in_device *in_dev = __in_dev_get_rtnl(dev);
cf7afbfe
TG		 1680 struct nlattr *a, *tb[IFLA_INET_MAX+1];
1681 int rem;
1682
1683 if (!in_dev)
1684 return -EAFNOSUPPORT;
1685
1686 if (nla_parse_nested(tb, IFLA_INET_MAX, nla, NULL) < 0)
1687 BUG();
1688
9f0f7272
TG		 1689 if (tb[IFLA_INET_CONF]) {
1690 nla_for_each_nested(a, tb[IFLA_INET_CONF], rem)
1691 ipv4_devconf_set(in_dev, nla_type(a), nla_get_u32(a));
1692 }
1693
1694 return 0;
1695}
1696
edc9e748
ND		 1697static int inet_netconf_msgsize_devconf(int type)
1698{
1699 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
1700 + nla_total_size(4); /* NETCONFA_IFINDEX */
1701
9e551110
ND		 1702 /* type -1 is used for ALL */
1703 if (type == -1 || type == NETCONFA_FORWARDING)
edc9e748 1704 size += nla_total_size(4);
cc535dfb
ND		 1705 if (type == -1 || type == NETCONFA_RP_FILTER)
1706 size += nla_total_size(4);
d67b8c61
ND		 1707 if (type == -1 || type == NETCONFA_MC_FORWARDING)
1708 size += nla_total_size(4);
09aea5df 1709 if (type == -1 || type == NETCONFA_PROXY_NEIGH)
f085ff1c 1710 size += nla_total_size(4);
edc9e748
ND		 1711
1712 return size;
1713}
1714
1715static int inet_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
1716 struct ipv4_devconf *devconf, u32 portid,
1717 u32 seq, int event, unsigned int flags,
1718 int type)
1719{
1720 struct nlmsghdr *nlh;
1721 struct netconfmsg *ncm;
1722
1723 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
1724 flags);
1725 if (nlh == NULL)
1726 return -EMSGSIZE;
1727
1728 ncm = nlmsg_data(nlh);
1729 ncm->ncm_family = AF_INET;
1730
1731 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
1732 goto nla_put_failure;
1733
9e551110
ND		 1734 /* type -1 is used for ALL */
1735 if ((type == -1 || type == NETCONFA_FORWARDING) &&
edc9e748
ND		 1736 nla_put_s32(skb, NETCONFA_FORWARDING,
1737 IPV4_DEVCONF(*devconf, FORWARDING)) < 0)
1738 goto nla_put_failure;
cc535dfb
ND		 1739 if ((type == -1 || type == NETCONFA_RP_FILTER) &&
1740 nla_put_s32(skb, NETCONFA_RP_FILTER,
1741 IPV4_DEVCONF(*devconf, RP_FILTER)) < 0)
1742 goto nla_put_failure;
d67b8c61
ND		 1743 if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
1744 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
1745 IPV4_DEVCONF(*devconf, MC_FORWARDING)) < 0)
1746 goto nla_put_failure;
09aea5df 1747 if ((type == -1 || type == NETCONFA_PROXY_NEIGH) &&
1748 nla_put_s32(skb, NETCONFA_PROXY_NEIGH,
f085ff1c 1749 IPV4_DEVCONF(*devconf, PROXY_ARP)) < 0)
1750 goto nla_put_failure;
edc9e748
ND		 1751
1752 return nlmsg_end(skb, nlh);
1753
1754nla_put_failure:
1755 nlmsg_cancel(skb, nlh);
1756 return -EMSGSIZE;
1757}
1758
d67b8c61
ND		 1759void inet_netconf_notify_devconf(struct net *net, int type, int ifindex,
1760 struct ipv4_devconf *devconf)
edc9e748
ND		 1761{
1762 struct sk_buff *skb;
1763 int err = -ENOBUFS;
1764
1765 skb = nlmsg_new(inet_netconf_msgsize_devconf(type), GFP_ATOMIC);
1766 if (skb == NULL)
1767 goto errout;
1768
1769 err = inet_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
1770 RTM_NEWNETCONF, 0, type);
1771 if (err < 0) {
1772 /* -EMSGSIZE implies BUG in inet_netconf_msgsize_devconf() */
1773 WARN_ON(err == -EMSGSIZE);
1774 kfree_skb(skb);
1775 goto errout;
1776 }
1777 rtnl_notify(skb, net, 0, RTNLGRP_IPV4_NETCONF, NULL, GFP_ATOMIC);
1778 return;
1779errout:
1780 if (err < 0)
1781 rtnl_set_sk_err(net, RTNLGRP_IPV4_NETCONF, err);
1782}
1783
9e551110
ND		 1784static const struct nla_policy devconf_ipv4_policy[NETCONFA_MAX+1] = {
1785 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
1786 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
cc535dfb 1787 [NETCONFA_RP_FILTER] = { .len = sizeof(int) },
09aea5df 1788 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
9e551110
ND		 1789};
1790
1791static int inet_netconf_get_devconf(struct sk_buff *in_skb,
661d2967 1792 struct nlmsghdr *nlh)
9e551110
ND		 1793{
1794 struct net *net = sock_net(in_skb->sk);
1795 struct nlattr *tb[NETCONFA_MAX+1];
1796 struct netconfmsg *ncm;
1797 struct sk_buff *skb;
1798 struct ipv4_devconf *devconf;
1799 struct in_device *in_dev;
1800 struct net_device *dev;
1801 int ifindex;
1802 int err;
1803
1804 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
1805 devconf_ipv4_policy);
1806 if (err < 0)
1807 goto errout;
1808
1809 err = EINVAL;
1810 if (!tb[NETCONFA_IFINDEX])
1811 goto errout;
1812
1813 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
1814 switch (ifindex) {
1815 case NETCONFA_IFINDEX_ALL:
1816 devconf = net->ipv4.devconf_all;
1817 break;
1818 case NETCONFA_IFINDEX_DEFAULT:
1819 devconf = net->ipv4.devconf_dflt;
1820 break;
1821 default:
1822 dev = __dev_get_by_index(net, ifindex);
1823 if (dev == NULL)
1824 goto errout;
1825 in_dev = __in_dev_get_rtnl(dev);
1826 if (in_dev == NULL)
1827 goto errout;
1828 devconf = &in_dev->cnf;
1829 break;
1830 }
1831
1832 err = -ENOBUFS;
1833 skb = nlmsg_new(inet_netconf_msgsize_devconf(-1), GFP_ATOMIC);
1834 if (skb == NULL)
1835 goto errout;
1836
1837 err = inet_netconf_fill_devconf(skb, ifindex, devconf,
1838 NETLINK_CB(in_skb).portid,
1839 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
1840 -1);
1841 if (err < 0) {
1842 /* -EMSGSIZE implies BUG in inet_netconf_msgsize_devconf() */
1843 WARN_ON(err == -EMSGSIZE);
1844 kfree_skb(skb);
1845 goto errout;
1846 }
1847 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
1848errout:
1849 return err;
1850}
1851
7a674200
ND		 1852static int inet_netconf_dump_devconf(struct sk_buff *skb,
1853 struct netlink_callback *cb)
1854{
1855 struct net *net = sock_net(skb->sk);
1856 int h, s_h;
1857 int idx, s_idx;
1858 struct net_device *dev;
1859 struct in_device *in_dev;
1860 struct hlist_head *head;
1861
1862 s_h = cb->args[0];
1863 s_idx = idx = cb->args[1];
1864
1865 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1866 idx = 0;
1867 head = &net->dev_index_head[h];
1868 rcu_read_lock();
0465277f
ND		 1869 cb->seq = atomic_read(&net->ipv4.dev_addr_genid) ^
1870 net->dev_base_seq;
7a674200
ND		 1871 hlist_for_each_entry_rcu(dev, head, index_hlist) {
1872 if (idx < s_idx)
1873 goto cont;
1874 in_dev = __in_dev_get_rcu(dev);
1875 if (!in_dev)
1876 goto cont;
1877
1878 if (inet_netconf_fill_devconf(skb, dev->ifindex,
1879 &in_dev->cnf,
1880 NETLINK_CB(cb->skb).portid,
1881 cb->nlh->nlmsg_seq,
1882 RTM_NEWNETCONF,
1883 NLM_F_MULTI,
1884 -1) <= 0) {
1885 rcu_read_unlock();
1886 goto done;
1887 }
0465277f 1888 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7a674200
ND		 1889cont:
1890 idx++;
1891 }
1892 rcu_read_unlock();
1893 }
1894 if (h == NETDEV_HASHENTRIES) {
1895 if (inet_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
1896 net->ipv4.devconf_all,
1897 NETLINK_CB(cb->skb).portid,
1898 cb->nlh->nlmsg_seq,
1899 RTM_NEWNETCONF, NLM_F_MULTI,
1900 -1) <= 0)
1901 goto done;
1902 else
1903 h++;
1904 }
1905 if (h == NETDEV_HASHENTRIES + 1) {
1906 if (inet_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
1907 net->ipv4.devconf_dflt,
1908 NETLINK_CB(cb->skb).portid,
1909 cb->nlh->nlmsg_seq,
1910 RTM_NEWNETCONF, NLM_F_MULTI,
1911 -1) <= 0)
1912 goto done;
1913 else
1914 h++;
1915 }
1916done:
1917 cb->args[0] = h;
1918 cb->args[1] = idx;
1919
1920 return skb->len;
1921}
1922
1da177e4
LT		 1923#ifdef CONFIG_SYSCTL
1924
c0ce9fb3 1925static void devinet_copy_dflt_conf(struct net *net, int i)
31be3085
HX		 1926{
1927 struct net_device *dev;
1928
c6d14c84
ED		 1929 rcu_read_lock();
1930 for_each_netdev_rcu(net, dev) {
31be3085 1931 struct in_device *in_dev;
c6d14c84 1932
31be3085
HX		 1933 in_dev = __in_dev_get_rcu(dev);
1934 if (in_dev && !test_bit(i, in_dev->cnf.state))
9355bbd6 1935 in_dev->cnf.data[i] = net->ipv4.devconf_dflt->data[i];
31be3085 1936 }
c6d14c84 1937 rcu_read_unlock();
31be3085
HX		 1938}
1939
c6d14c84 1940/* called with RTNL locked */
c0ce9fb3 1941static void inet_forward_change(struct net *net)
68dd299b
PE		 1942{
1943 struct net_device *dev;
586f1211 1944 int on = IPV4_DEVCONF_ALL(net, FORWARDING);
68dd299b 1945
586f1211 1946 IPV4_DEVCONF_ALL(net, ACCEPT_REDIRECTS) = !on;
9355bbd6 1947 IPV4_DEVCONF_DFLT(net, FORWARDING) = on;
edc9e748
ND		 1948 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING,
1949 NETCONFA_IFINDEX_ALL,
1950 net->ipv4.devconf_all);
1951 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING,
1952 NETCONFA_IFINDEX_DEFAULT,
1953 net->ipv4.devconf_dflt);
68dd299b 1954
c0ce9fb3 1955 for_each_netdev(net, dev) {
68dd299b 1956 struct in_device *in_dev;
0187bdfb
BH		 1957 if (on)
1958 dev_disable_lro(dev);
68dd299b
PE		 1959 rcu_read_lock();
1960 in_dev = __in_dev_get_rcu(dev);
edc9e748 1961 if (in_dev) {
68dd299b 1962 IN_DEV_CONF_SET(in_dev, FORWARDING, on);
edc9e748
ND		 1963 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING,
1964 dev->ifindex, &in_dev->cnf);
1965 }
68dd299b
PE		 1966 rcu_read_unlock();
1967 }
68dd299b
PE		 1968}
1969
f085ff1c 1970static int devinet_conf_ifindex(struct net *net, struct ipv4_devconf *cnf)
1971{
1972 if (cnf == net->ipv4.devconf_dflt)
1973 return NETCONFA_IFINDEX_DEFAULT;
1974 else if (cnf == net->ipv4.devconf_all)
1975 return NETCONFA_IFINDEX_ALL;
1976 else {
1977 struct in_device *idev
1978 = container_of(cnf, struct in_device, cnf);
1979 return idev->dev->ifindex;
1980 }
1981}
1982
fe2c6338 1983static int devinet_conf_proc(struct ctl_table *ctl, int write,
8d65af78 1984 void __user *buffer,
31be3085
HX		 1985 size_t *lenp, loff_t *ppos)
1986{
d01ff0a0 1987 int old_value = *(int *)ctl->data;
8d65af78 1988 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
d01ff0a0 1989 int new_value = *(int *)ctl->data;
31be3085
HX		 1990
1991 if (write) {
1992 struct ipv4_devconf *cnf = ctl->extra1;
c0ce9fb3 1993 struct net *net = ctl->extra2;
31be3085 1994 int i = (int *)ctl->data - cnf->data;
f085ff1c 1995 int ifindex;
31be3085
HX		 1996
1997 set_bit(i, cnf->state);
1998
9355bbd6 1999 if (cnf == net->ipv4.devconf_dflt)
c0ce9fb3 2000 devinet_copy_dflt_conf(net, i);
d0daebc3
TG		 2001 if (i == IPV4_DEVCONF_ACCEPT_LOCAL - 1 ||
2002 i == IPV4_DEVCONF_ROUTE_LOCALNET - 1)
d01ff0a0 2003 if ((new_value == 0) && (old_value != 0))
4ccfe6d4 2004 rt_cache_flush(net);
f085ff1c 2005
cc535dfb
ND		 2006 if (i == IPV4_DEVCONF_RP_FILTER - 1 &&
2007 new_value != old_value) {
f085ff1c 2008 ifindex = devinet_conf_ifindex(net, cnf);
cc535dfb
ND		 2009 inet_netconf_notify_devconf(net, NETCONFA_RP_FILTER,
2010 ifindex, cnf);
2011 }
f085ff1c 2012 if (i == IPV4_DEVCONF_PROXY_ARP - 1 &&
2013 new_value != old_value) {
2014 ifindex = devinet_conf_ifindex(net, cnf);
09aea5df 2015 inet_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
f085ff1c 2016 ifindex, cnf);
2017 }
31be3085
HX		 2018 }
2019
2020 return ret;
2021}
2022
fe2c6338 2023static int devinet_sysctl_forward(struct ctl_table *ctl, int write,
8d65af78 2024 void __user *buffer,
1da177e4
LT		 2025 size_t *lenp, loff_t *ppos)
2026{
2027 int *valp = ctl->data;
2028 int val = *valp;
88af182e 2029 loff_t pos = *ppos;
8d65af78 2030 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
1da177e4
LT		 2031
2032 if (write && *valp != val) {
c0ce9fb3
PE		 2033 struct net *net = ctl->extra2;
2034
0187bdfb 2035 if (valp != &IPV4_DEVCONF_DFLT(net, FORWARDING)) {
88af182e
EB		 2036 if (!rtnl_trylock()) {
2037 /* Restore the original values before restarting */
2038 *valp = val;
2039 *ppos = pos;
9b8adb5e 2040 return restart_syscall();
88af182e 2041 }
0187bdfb
BH		 2042 if (valp == &IPV4_DEVCONF_ALL(net, FORWARDING)) {
2043 inet_forward_change(net);
edc9e748 2044 } else {
0187bdfb
BH		 2045 struct ipv4_devconf *cnf = ctl->extra1;
2046 struct in_device *idev =
2047 container_of(cnf, struct in_device, cnf);
edc9e748
ND		 2048 if (*valp)
2049 dev_disable_lro(idev->dev);
2050 inet_netconf_notify_devconf(net,
2051 NETCONFA_FORWARDING,
2052 idev->dev->ifindex,
2053 cnf);
0187bdfb
BH		 2054 }
2055 rtnl_unlock();
4ccfe6d4 2056 rt_cache_flush(net);
edc9e748
ND		 2057 } else
2058 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING,
2059 NETCONFA_IFINDEX_DEFAULT,
2060 net->ipv4.devconf_dflt);
1da177e4
LT		 2061 }
2062
2063 return ret;
2064}
2065
fe2c6338 2066static int ipv4_doint_and_flush(struct ctl_table *ctl, int write,
323e126f
DM		 2067 void __user *buffer,
2068 size_t *lenp, loff_t *ppos)
1da177e4
LT		 2069{
2070 int *valp = ctl->data;
2071 int val = *valp;
8d65af78 2072 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
76e6ebfb 2073 struct net *net = ctl->extra2;
1da177e4
LT		 2074
2075 if (write && *valp != val)
4ccfe6d4 2076 rt_cache_flush(net);
1da177e4
LT		 2077
2078 return ret;
2079}
2080
f8572d8f 2081#define DEVINET_SYSCTL_ENTRY(attr, name, mval, proc) \
42f811b8 2082 { \
42f811b8
HX		 2083 .procname = name, \
2084 .data = ipv4_devconf.data + \
02291680 2085 IPV4_DEVCONF_ ## attr - 1, \
42f811b8
HX		 2086 .maxlen = sizeof(int), \
2087 .mode = mval, \
2088 .proc_handler = proc, \
31be3085 2089 .extra1 = &ipv4_devconf, \
42f811b8
HX		 2090 }
2091
2092#define DEVINET_SYSCTL_RW_ENTRY(attr, name) \
f8572d8f 2093 DEVINET_SYSCTL_ENTRY(attr, name, 0644, devinet_conf_proc)
42f811b8
HX		 2094
2095#define DEVINET_SYSCTL_RO_ENTRY(attr, name) \
f8572d8f 2096 DEVINET_SYSCTL_ENTRY(attr, name, 0444, devinet_conf_proc)
42f811b8 2097
f8572d8f
EB		 2098#define DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, proc) \
2099 DEVINET_SYSCTL_ENTRY(attr, name, 0644, proc)
42f811b8
HX		 2100
2101#define DEVINET_SYSCTL_FLUSHING_ENTRY(attr, name) \
f8572d8f 2102 DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, ipv4_doint_and_flush)
42f811b8 2103
1da177e4
LT		 2104static struct devinet_sysctl_table {
2105 struct ctl_table_header *sysctl_header;
02291680 2106 struct ctl_table devinet_vars[__IPV4_DEVCONF_MAX];
1da177e4
LT		 2107} devinet_sysctl = {
2108 .devinet_vars = {
42f811b8 2109 DEVINET_SYSCTL_COMPLEX_ENTRY(FORWARDING, "forwarding",
f8572d8f 2110 devinet_sysctl_forward),
42f811b8
HX		 2111 DEVINET_SYSCTL_RO_ENTRY(MC_FORWARDING, "mc_forwarding"),
2112
2113 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_REDIRECTS, "accept_redirects"),
2114 DEVINET_SYSCTL_RW_ENTRY(SECURE_REDIRECTS, "secure_redirects"),
2115 DEVINET_SYSCTL_RW_ENTRY(SHARED_MEDIA, "shared_media"),
2116 DEVINET_SYSCTL_RW_ENTRY(RP_FILTER, "rp_filter"),
2117 DEVINET_SYSCTL_RW_ENTRY(SEND_REDIRECTS, "send_redirects"),
2118 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_SOURCE_ROUTE,
2119 "accept_source_route"),
8153a10c 2120 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_LOCAL, "accept_local"),
28f6aeea 2121 DEVINET_SYSCTL_RW_ENTRY(SRC_VMARK, "src_valid_mark"),
42f811b8
HX		 2122 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP, "proxy_arp"),
2123 DEVINET_SYSCTL_RW_ENTRY(MEDIUM_ID, "medium_id"),
2124 DEVINET_SYSCTL_RW_ENTRY(BOOTP_RELAY, "bootp_relay"),
2125 DEVINET_SYSCTL_RW_ENTRY(LOG_MARTIANS, "log_martians"),
2126 DEVINET_SYSCTL_RW_ENTRY(TAG, "tag"),
2127 DEVINET_SYSCTL_RW_ENTRY(ARPFILTER, "arp_filter"),
2128 DEVINET_SYSCTL_RW_ENTRY(ARP_ANNOUNCE, "arp_announce"),
2129 DEVINET_SYSCTL_RW_ENTRY(ARP_IGNORE, "arp_ignore"),
2130 DEVINET_SYSCTL_RW_ENTRY(ARP_ACCEPT, "arp_accept"),
eefef1cf 2131 DEVINET_SYSCTL_RW_ENTRY(ARP_NOTIFY, "arp_notify"),
65324144 2132 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP_PVLAN, "proxy_arp_pvlan"),
5c6fe01c
WM		 2133 DEVINET_SYSCTL_RW_ENTRY(FORCE_IGMP_VERSION,
2134 "force_igmp_version"),
2690048c
WM		 2135 DEVINET_SYSCTL_RW_ENTRY(IGMPV2_UNSOLICITED_REPORT_INTERVAL,
2136 "igmpv2_unsolicited_report_interval"),
2137 DEVINET_SYSCTL_RW_ENTRY(IGMPV3_UNSOLICITED_REPORT_INTERVAL,
2138 "igmpv3_unsolicited_report_interval"),
42f811b8
HX		 2139
2140 DEVINET_SYSCTL_FLUSHING_ENTRY(NOXFRM, "disable_xfrm"),
2141 DEVINET_SYSCTL_FLUSHING_ENTRY(NOPOLICY, "disable_policy"),
42f811b8
HX		 2142 DEVINET_SYSCTL_FLUSHING_ENTRY(PROMOTE_SECONDARIES,
2143 "promote_secondaries"),
d0daebc3
TG		 2144 DEVINET_SYSCTL_FLUSHING_ENTRY(ROUTE_LOCALNET,
2145 "route_localnet"),
1da177e4 2146 },
1da177e4
LT		 2147};
2148
ea40b324 2149static int __devinet_sysctl_register(struct net *net, char *dev_name,
f8572d8f 2150 struct ipv4_devconf *p)
1da177e4
LT		 2151{
2152 int i;
9fa89642 2153 struct devinet_sysctl_table *t;
8607ddb8 2154 char path[sizeof("net/ipv4/conf/") + IFNAMSIZ];
bfada697 2155
9fa89642 2156 t = kmemdup(&devinet_sysctl, sizeof(*t), GFP_KERNEL);
1da177e4 2157 if (!t)
9fa89642
PE		 2158 goto out;
2159
1da177e4
LT		 2160 for (i = 0; i < ARRAY_SIZE(t->devinet_vars) - 1; i++) {
2161 t->devinet_vars[i].data += (char *)p - (char *)&ipv4_devconf;
31be3085 2162 t->devinet_vars[i].extra1 = p;
c0ce9fb3 2163 t->devinet_vars[i].extra2 = net;
1da177e4
LT		 2164 }
2165
8607ddb8 2166 snprintf(path, sizeof(path), "net/ipv4/conf/%s", dev_name);
1da177e4 2167
8607ddb8 2168 t->sysctl_header = register_net_sysctl(net, path, t->devinet_vars);
1da177e4 2169 if (!t->sysctl_header)
8607ddb8 2170 goto free;
1da177e4
LT		 2171
2172 p->sysctl = t;
ea40b324 2173 return 0;
1da177e4 2174
9fa89642 2175free:
1da177e4 2176 kfree(t);
9fa89642 2177out:
ea40b324 2178 return -ENOBUFS;
1da177e4
LT		 2179}
2180
51602b2a
PE		 2181static void __devinet_sysctl_unregister(struct ipv4_devconf *cnf)
2182{
2183 struct devinet_sysctl_table *t = cnf->sysctl;
2184
2185 if (t == NULL)
2186 return;
2187
2188 cnf->sysctl = NULL;
ff538818 2189 unregister_net_sysctl_table(t->sysctl_header);
51602b2a
PE		 2190 kfree(t);
2191}
2192
20e61da7 2193static int devinet_sysctl_register(struct in_device *idev)
66f27a52 2194{
20e61da7
WC		 2195 int err;
2196
2197 if (!sysctl_dev_name_is_allowed(idev->dev->name))
2198 return -EINVAL;
2199
2200 err = neigh_sysctl_register(idev->dev, idev->arp_parms, NULL);
2201 if (err)
2202 return err;
2203 err = __devinet_sysctl_register(dev_net(idev->dev), idev->dev->name,
f8572d8f 2204 &idev->cnf);
20e61da7
WC		 2205 if (err)
2206 neigh_sysctl_unregister(idev->arp_parms);
2207 return err;
66f27a52
PE		 2208}
2209
51602b2a 2210static void devinet_sysctl_unregister(struct in_device *idev)
1da177e4 2211{
51602b2a
PE		 2212 __devinet_sysctl_unregister(&idev->cnf);
2213 neigh_sysctl_unregister(idev->arp_parms);
1da177e4 2214}
1da177e4 2215
68dd299b
PE		 2216static struct ctl_table ctl_forward_entry[] = {
2217 {
68dd299b
PE		 2218 .procname = "ip_forward",
2219 .data = &ipv4_devconf.data[
02291680 2220 IPV4_DEVCONF_FORWARDING - 1],
68dd299b
PE		 2221 .maxlen = sizeof(int),
2222 .mode = 0644,
2223 .proc_handler = devinet_sysctl_forward,
68dd299b 2224 .extra1 = &ipv4_devconf,
c0ce9fb3 2225 .extra2 = &init_net,
68dd299b
PE		 2226 },
2227 { },
2228};
2a75de0c 2229#endif
68dd299b 2230
752d14dc
PE		 2231static __net_init int devinet_init_net(struct net *net)
2232{
2233 int err;
752d14dc 2234 struct ipv4_devconf *all, *dflt;
2a75de0c
ED		 2235#ifdef CONFIG_SYSCTL
2236 struct ctl_table *tbl = ctl_forward_entry;
752d14dc 2237 struct ctl_table_header *forw_hdr;
2a75de0c 2238#endif
752d14dc
PE		 2239
2240 err = -ENOMEM;
2241 all = &ipv4_devconf;
2242 dflt = &ipv4_devconf_dflt;
752d14dc 2243
09ad9bc7 2244 if (!net_eq(net, &init_net)) {
752d14dc
PE		 2245 all = kmemdup(all, sizeof(ipv4_devconf), GFP_KERNEL);
2246 if (all == NULL)
2247 goto err_alloc_all;
2248
2249 dflt = kmemdup(dflt, sizeof(ipv4_devconf_dflt), GFP_KERNEL);
2250 if (dflt == NULL)
2251 goto err_alloc_dflt;
2252
2a75de0c 2253#ifdef CONFIG_SYSCTL
752d14dc
PE		 2254 tbl = kmemdup(tbl, sizeof(ctl_forward_entry), GFP_KERNEL);
2255 if (tbl == NULL)
2256 goto err_alloc_ctl;
2257
02291680 2258 tbl[0].data = &all->data[IPV4_DEVCONF_FORWARDING - 1];
752d14dc
PE		 2259 tbl[0].extra1 = all;
2260 tbl[0].extra2 = net;
2a75de0c 2261#endif
752d14dc
PE		 2262 }
2263
2264#ifdef CONFIG_SYSCTL
f8572d8f 2265 err = __devinet_sysctl_register(net, "all", all);
752d14dc
PE		 2266 if (err < 0)
2267 goto err_reg_all;
2268
f8572d8f 2269 err = __devinet_sysctl_register(net, "default", dflt);
752d14dc
PE		 2270 if (err < 0)
2271 goto err_reg_dflt;
2272
2273 err = -ENOMEM;
8607ddb8 2274 forw_hdr = register_net_sysctl(net, "net/ipv4", tbl);
752d14dc
PE		 2275 if (forw_hdr == NULL)
2276 goto err_reg_ctl;
2a75de0c 2277 net->ipv4.forw_hdr = forw_hdr;
752d14dc
PE		 2278#endif
2279
752d14dc
PE		 2280 net->ipv4.devconf_all = all;
2281 net->ipv4.devconf_dflt = dflt;
2282 return 0;
2283
2284#ifdef CONFIG_SYSCTL
2285err_reg_ctl:
2286 __devinet_sysctl_unregister(dflt);
2287err_reg_dflt:
2288 __devinet_sysctl_unregister(all);
2289err_reg_all:
2290 if (tbl != ctl_forward_entry)
2291 kfree(tbl);
752d14dc 2292err_alloc_ctl:
2a75de0c 2293#endif
752d14dc
PE		 2294 if (dflt != &ipv4_devconf_dflt)
2295 kfree(dflt);
2296err_alloc_dflt:
2297 if (all != &ipv4_devconf)
2298 kfree(all);
2299err_alloc_all:
2300 return err;
2301}
2302
2303static __net_exit void devinet_exit_net(struct net *net)
2304{
2a75de0c 2305#ifdef CONFIG_SYSCTL
752d14dc
PE		 2306 struct ctl_table *tbl;
2307
2308 tbl = net->ipv4.forw_hdr->ctl_table_arg;
752d14dc
PE		 2309 unregister_net_sysctl_table(net->ipv4.forw_hdr);
2310 __devinet_sysctl_unregister(net->ipv4.devconf_dflt);
2311 __devinet_sysctl_unregister(net->ipv4.devconf_all);
752d14dc 2312 kfree(tbl);
2a75de0c 2313#endif
752d14dc
PE		 2314 kfree(net->ipv4.devconf_dflt);
2315 kfree(net->ipv4.devconf_all);
2316}
2317
2318static __net_initdata struct pernet_operations devinet_ops = {
2319 .init = devinet_init_net,
2320 .exit = devinet_exit_net,
2321};
2322
9f0f7272
TG		 2323static struct rtnl_af_ops inet_af_ops = {
2324 .family = AF_INET,
2325 .fill_link_af = inet_fill_link_af,
2326 .get_link_af_size = inet_get_link_af_size,
cf7afbfe
TG		 2327 .validate_link_af = inet_validate_link_af,
2328 .set_link_af = inet_set_link_af,
9f0f7272
TG		 2329};
2330
1da177e4
LT		 2331void __init devinet_init(void)
2332{
fd23c3b3
DM		 2333 int i;
2334
2335 for (i = 0; i < IN4_ADDR_HSIZE; i++)
2336 INIT_HLIST_HEAD(&inet_addr_lst[i]);
2337
752d14dc
PE		 2338 register_pernet_subsys(&devinet_ops);
2339
1da177e4
LT		 2340 register_gifconf(PF_INET, inet_gifconf);
2341 register_netdevice_notifier(&ip_netdev_notifier);
63f3444f 2342
906e073f 2343 queue_delayed_work(system_power_efficient_wq, &check_lifetime_work, 0);
5c766d64 2344
9f0f7272
TG		 2345 rtnl_af_register(&inet_af_ops);
2346
c7ac8679
GR		 2347 rtnl_register(PF_INET, RTM_NEWADDR, inet_rtm_newaddr, NULL, NULL);
2348 rtnl_register(PF_INET, RTM_DELADDR, inet_rtm_deladdr, NULL, NULL);
2349 rtnl_register(PF_INET, RTM_GETADDR, NULL, inet_dump_ifaddr, NULL);
9e551110 2350 rtnl_register(PF_INET, RTM_GETNETCONF, inet_netconf_get_devconf,
7a674200 2351 inet_netconf_dump_devconf, NULL);
1da177e4
LT		 2352}
2353
Linux 6.x block layer and io_uring tree(s)