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drivers: power: report battery voltage in AOSP compatible format
[GitHub/mt8127/android_kernel_alcatel_ttab.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 61#include <net/ip.h>
6fa3eb70 62#include <net/tcp.h>
1da177e4
LT		 63#include <net/route.h>
64#include <net/ip_fib.h>
63f3444f 65#include <net/rtnetlink.h>
752d14dc 66#include <net/net_namespace.h>
5c766d64 67#include <net/addrconf.h>
1da177e4 68
406b6f97
DM		 69#include "fib_lookup.h"
70
0027ba84 71static struct ipv4_devconf ipv4_devconf = {
42f811b8 72 .data = {
02291680
EB		 73 [IPV4_DEVCONF_ACCEPT_REDIRECTS - 1] = 1,
74 [IPV4_DEVCONF_SEND_REDIRECTS - 1] = 1,
75 [IPV4_DEVCONF_SECURE_REDIRECTS - 1] = 1,
76 [IPV4_DEVCONF_SHARED_MEDIA - 1] = 1,
42f811b8 77 },
1da177e4
LT		 78};
79
80static struct ipv4_devconf ipv4_devconf_dflt = {
42f811b8 81 .data = {
02291680
EB		 82 [IPV4_DEVCONF_ACCEPT_REDIRECTS - 1] = 1,
83 [IPV4_DEVCONF_SEND_REDIRECTS - 1] = 1,
84 [IPV4_DEVCONF_SECURE_REDIRECTS - 1] = 1,
85 [IPV4_DEVCONF_SHARED_MEDIA - 1] = 1,
86 [IPV4_DEVCONF_ACCEPT_SOURCE_ROUTE - 1] = 1,
42f811b8 87 },
1da177e4
LT		 88};
89
9355bbd6
PE		 90#define IPV4_DEVCONF_DFLT(net, attr) \
91 IPV4_DEVCONF((*net->ipv4.devconf_dflt), attr)
42f811b8 92
ef7c79ed 93static const struct nla_policy ifa_ipv4_policy[IFA_MAX+1] = {
5c753978
TG		 94 [IFA_LOCAL] = { .type = NLA_U32 },
95 [IFA_ADDRESS] = { .type = NLA_U32 },
96 [IFA_BROADCAST] = { .type = NLA_U32 },
5176f91e 97 [IFA_LABEL] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 },
5c766d64 98 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
5c753978
TG		 99};
100
40384999
ED		 101#define IN4_ADDR_HSIZE_SHIFT 8
102#define IN4_ADDR_HSIZE (1U << IN4_ADDR_HSIZE_SHIFT)
103
fd23c3b3
DM		 104static struct hlist_head inet_addr_lst[IN4_ADDR_HSIZE];
105static DEFINE_SPINLOCK(inet_addr_hash_lock);
106
40384999 107static u32 inet_addr_hash(struct net *net, __be32 addr)
fd23c3b3 108{
40384999 109 u32 val = (__force u32) addr ^ net_hash_mix(net);
fd23c3b3 110
40384999 111 return hash_32(val, IN4_ADDR_HSIZE_SHIFT);
fd23c3b3
DM		 112}
113
114static void inet_hash_insert(struct net *net, struct in_ifaddr *ifa)
115{
40384999 116 u32 hash = inet_addr_hash(net, ifa->ifa_local);
fd23c3b3
DM		 117
118 spin_lock(&inet_addr_hash_lock);
119 hlist_add_head_rcu(&ifa->hash, &inet_addr_lst[hash]);
120 spin_unlock(&inet_addr_hash_lock);
121}
122
123static void inet_hash_remove(struct in_ifaddr *ifa)
124{
125 spin_lock(&inet_addr_hash_lock);
126 hlist_del_init_rcu(&ifa->hash);
127 spin_unlock(&inet_addr_hash_lock);
128}
129
9435eb1c
DM		 130/**
131 * __ip_dev_find - find the first device with a given source address.
132 * @net: the net namespace
133 * @addr: the source address
134 * @devref: if true, take a reference on the found device
135 *
136 * If a caller uses devref=false, it should be protected by RCU, or RTNL
137 */
138struct net_device *__ip_dev_find(struct net *net, __be32 addr, bool devref)
139{
40384999 140 u32 hash = inet_addr_hash(net, addr);
9435eb1c
DM		 141 struct net_device *result = NULL;
142 struct in_ifaddr *ifa;
9435eb1c
DM		 143
144 rcu_read_lock();
b67bfe0d 145 hlist_for_each_entry_rcu(ifa, &inet_addr_lst[hash], hash) {
e066008b 146 if (ifa->ifa_local == addr) {
40384999
ED		 147 struct net_device *dev = ifa->ifa_dev->dev;
148
149 if (!net_eq(dev_net(dev), net))
150 continue;
9435eb1c
DM		 151 result = dev;
152 break;
153 }
154 }
406b6f97
DM		 155 if (!result) {
156 struct flowi4 fl4 = { .daddr = addr };
157 struct fib_result res = { 0 };
158 struct fib_table *local;
159
160 /* Fallback to FIB local table so that communication
161 * over loopback subnets work.
162 */
163 local = fib_get_table(net, RT_TABLE_LOCAL);
164 if (local &&
165 !fib_table_lookup(local, &fl4, &res, FIB_LOOKUP_NOREF) &&
166 res.type == RTN_LOCAL)
167 result = FIB_RES_DEV(res);
168 }
9435eb1c
DM		 169 if (result && devref)
170 dev_hold(result);
171 rcu_read_unlock();
172 return result;
173}
174EXPORT_SYMBOL(__ip_dev_find);
175
d6062cbb 176static void rtmsg_ifa(int event, struct in_ifaddr *, struct nlmsghdr *, u32);
1da177e4 177
e041c683 178static BLOCKING_NOTIFIER_HEAD(inetaddr_chain);
1da177e4
LT		 179static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
180 int destroy);
181#ifdef CONFIG_SYSCTL
66f27a52 182static void devinet_sysctl_register(struct in_device *idev);
51602b2a
PE		 183static void devinet_sysctl_unregister(struct in_device *idev);
184#else
40384999 185static void devinet_sysctl_register(struct in_device *idev)
51602b2a
PE		 186{
187}
40384999 188static void devinet_sysctl_unregister(struct in_device *idev)
51602b2a
PE		 189{
190}
1da177e4
LT		 191#endif
192
193/* Locks all the inet devices. */
194
195static struct in_ifaddr *inet_alloc_ifa(void)
196{
93adcc80 197 return kzalloc(sizeof(struct in_ifaddr), GFP_KERNEL);
1da177e4
LT		 198}
199
200static void inet_rcu_free_ifa(struct rcu_head *head)
201{
202 struct in_ifaddr *ifa = container_of(head, struct in_ifaddr, rcu_head);
203 if (ifa->ifa_dev)
204 in_dev_put(ifa->ifa_dev);
205 kfree(ifa);
206}
207
40384999 208static void inet_free_ifa(struct in_ifaddr *ifa)
1da177e4
LT		 209{
210 call_rcu(&ifa->rcu_head, inet_rcu_free_ifa);
211}
212
213void in_dev_finish_destroy(struct in_device *idev)
214{
215 struct net_device *dev = idev->dev;
216
547b792c
IJ		 217 WARN_ON(idev->ifa_list);
218 WARN_ON(idev->mc_list);
1da177e4 219#ifdef NET_REFCNT_DEBUG
91df42be 220 pr_debug("%s: %p=%s\n", __func__, idev, dev ? dev->name : "NIL");
1da177e4
LT		 221#endif
222 dev_put(dev);
223 if (!idev->dead)
9f9354b9
ED		 224 pr_err("Freeing alive in_device %p\n", idev);
225 else
1da177e4 226 kfree(idev);
1da177e4 227}
9f9354b9 228EXPORT_SYMBOL(in_dev_finish_destroy);
1da177e4 229
71e27da9 230static struct in_device *inetdev_init(struct net_device *dev)
1da177e4
LT		 231{
232 struct in_device *in_dev;
233
234 ASSERT_RTNL();
235
0da974f4 236 in_dev = kzalloc(sizeof(*in_dev), GFP_KERNEL);
1da177e4
LT		 237 if (!in_dev)
238 goto out;
c346dca1 239 memcpy(&in_dev->cnf, dev_net(dev)->ipv4.devconf_dflt,
9355bbd6 240 sizeof(in_dev->cnf));
1da177e4
LT		 241 in_dev->cnf.sysctl = NULL;
242 in_dev->dev = dev;
9f9354b9
ED		 243 in_dev->arp_parms = neigh_parms_alloc(dev, &arp_tbl);
244 if (!in_dev->arp_parms)
1da177e4 245 goto out_kfree;
0187bdfb
BH		 246 if (IPV4_DEVCONF(in_dev->cnf, FORWARDING))
247 dev_disable_lro(dev);
1da177e4
LT		 248 /* Reference in_dev->dev */
249 dev_hold(dev);
30c4cf57 250 /* Account for reference dev->ip_ptr (below) */
1da177e4 251 in_dev_hold(in_dev);
1da177e4 252
66f27a52 253 devinet_sysctl_register(in_dev);
1da177e4
LT		 254 ip_mc_init_dev(in_dev);
255 if (dev->flags & IFF_UP)
256 ip_mc_up(in_dev);
483479ec 257
30c4cf57 258 /* we can receive as soon as ip_ptr is set -- do this last */
cf778b00 259 rcu_assign_pointer(dev->ip_ptr, in_dev);
483479ec 260out:
1da177e4
LT		 261 return in_dev;
262out_kfree:
263 kfree(in_dev);
264 in_dev = NULL;
265 goto out;
266}
267
268static void in_dev_rcu_put(struct rcu_head *head)
269{
270 struct in_device *idev = container_of(head, struct in_device, rcu_head);
271 in_dev_put(idev);
272}
273
274static void inetdev_destroy(struct in_device *in_dev)
275{
276 struct in_ifaddr *ifa;
277 struct net_device *dev;
278
279 ASSERT_RTNL();
280
281 dev = in_dev->dev;
1da177e4
LT		 282
283 in_dev->dead = 1;
284
285 ip_mc_destroy_dev(in_dev);
286
287 while ((ifa = in_dev->ifa_list) != NULL) {
288 inet_del_ifa(in_dev, &in_dev->ifa_list, 0);
289 inet_free_ifa(ifa);
290 }
291
a9b3cd7f 292 RCU_INIT_POINTER(dev->ip_ptr, NULL);
1da177e4 293
51602b2a 294 devinet_sysctl_unregister(in_dev);
1da177e4
LT		 295 neigh_parms_release(&arp_tbl, in_dev->arp_parms);
296 arp_ifdown(dev);
297
298 call_rcu(&in_dev->rcu_head, in_dev_rcu_put);
299}
300
ff428d72 301int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b)
1da177e4
LT		 302{
303 rcu_read_lock();
304 for_primary_ifa(in_dev) {
305 if (inet_ifa_match(a, ifa)) {
306 if (!b || inet_ifa_match(b, ifa)) {
307 rcu_read_unlock();
308 return 1;
309 }
310 }
311 } endfor_ifa(in_dev);
312 rcu_read_unlock();
313 return 0;
314}
315
d6062cbb 316static void __inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
15e47304 317 int destroy, struct nlmsghdr *nlh, u32 portid)
1da177e4 318{
8f937c60 319 struct in_ifaddr *promote = NULL;
0ff60a45
JHS		 320 struct in_ifaddr *ifa, *ifa1 = *ifap;
321 struct in_ifaddr *last_prim = in_dev->ifa_list;
322 struct in_ifaddr *prev_prom = NULL;
323 int do_promote = IN_DEV_PROMOTE_SECONDARIES(in_dev);
1da177e4
LT		 324
325 ASSERT_RTNL();
326
e905a9ed 327 /* 1. Deleting primary ifaddr forces deletion all secondaries
8f937c60
HW		 328 * unless alias promotion is set
329 **/
1da177e4
LT		 330
331 if (!(ifa1->ifa_flags & IFA_F_SECONDARY)) {
1da177e4
LT		 332 struct in_ifaddr **ifap1 = &ifa1->ifa_next;
333
334 while ((ifa = *ifap1) != NULL) {
e905a9ed 335 if (!(ifa->ifa_flags & IFA_F_SECONDARY) &&
0ff60a45
JHS		 336 ifa1->ifa_scope <= ifa->ifa_scope)
337 last_prim = ifa;
338
1da177e4
LT		 339 if (!(ifa->ifa_flags & IFA_F_SECONDARY) ||
340 ifa1->ifa_mask != ifa->ifa_mask ||
341 !inet_ifa_match(ifa1->ifa_address, ifa)) {
342 ifap1 = &ifa->ifa_next;
0ff60a45 343 prev_prom = ifa;
1da177e4
LT		 344 continue;
345 }
346
0ff60a45 347 if (!do_promote) {
fd23c3b3 348 inet_hash_remove(ifa);
8f937c60 349 *ifap1 = ifa->ifa_next;
1da177e4 350
15e47304 351 rtmsg_ifa(RTM_DELADDR, ifa, nlh, portid);
e041c683
AS		 352 blocking_notifier_call_chain(&inetaddr_chain,
353 NETDEV_DOWN, ifa);
8f937c60
HW		 354 inet_free_ifa(ifa);
355 } else {
356 promote = ifa;
357 break;
358 }
1da177e4
LT		 359 }
360 }
361
2d230e2b
JA		 362 /* On promotion all secondaries from subnet are changing
363 * the primary IP, we must remove all their routes silently
364 * and later to add them back with new prefsrc. Do this
365 * while all addresses are on the device list.
366 */
367 for (ifa = promote; ifa; ifa = ifa->ifa_next) {
368 if (ifa1->ifa_mask == ifa->ifa_mask &&
369 inet_ifa_match(ifa1->ifa_address, ifa))
370 fib_del_ifaddr(ifa, ifa1);
371 }
372
1da177e4
LT		 373 /* 2. Unlink it */
374
375 *ifap = ifa1->ifa_next;
fd23c3b3 376 inet_hash_remove(ifa1);
1da177e4
LT		 377
378 /* 3. Announce address deletion */
379
380 /* Send message first, then call notifier.
381 At first sight, FIB update triggered by notifier
382 will refer to already deleted ifaddr, that could confuse
383 netlink listeners. It is not true: look, gated sees
384 that route deleted and if it still thinks that ifaddr
385 is valid, it will try to restore deleted routes... Grr.
386 So that, this order is correct.
387 */
15e47304 388 rtmsg_ifa(RTM_DELADDR, ifa1, nlh, portid);
e041c683 389 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa1);
1da177e4 390
0ff60a45 391 if (promote) {
04024b93 392 struct in_ifaddr *next_sec = promote->ifa_next;
0ff60a45
JHS		 393
394 if (prev_prom) {
395 prev_prom->ifa_next = promote->ifa_next;
396 promote->ifa_next = last_prim->ifa_next;
397 last_prim->ifa_next = promote;
398 }
8f937c60 399
8f937c60 400 promote->ifa_flags &= ~IFA_F_SECONDARY;
15e47304 401 rtmsg_ifa(RTM_NEWADDR, promote, nlh, portid);
e041c683
AS		 402 blocking_notifier_call_chain(&inetaddr_chain,
403 NETDEV_UP, promote);
04024b93 404 for (ifa = next_sec; ifa; ifa = ifa->ifa_next) {
0ff60a45
JHS		 405 if (ifa1->ifa_mask != ifa->ifa_mask ||
406 !inet_ifa_match(ifa1->ifa_address, ifa))
407 continue;
408 fib_add_ifaddr(ifa);
409 }
410
411 }
6363097c 412 if (destroy)
0ff60a45 413 inet_free_ifa(ifa1);
1da177e4
LT		 414}
415
d6062cbb
TG		 416static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
417 int destroy)
418{
419 __inet_del_ifa(in_dev, ifap, destroy, NULL, 0);
420}
421
5c766d64
JP		 422static void check_lifetime(struct work_struct *work);
423
424static DECLARE_DELAYED_WORK(check_lifetime_work, check_lifetime);
425
d6062cbb 426static int __inet_insert_ifa(struct in_ifaddr *ifa, struct nlmsghdr *nlh,
15e47304 427 u32 portid)
1da177e4
LT		 428{
429 struct in_device *in_dev = ifa->ifa_dev;
430 struct in_ifaddr *ifa1, **ifap, **last_primary;
431
432 ASSERT_RTNL();
433
434 if (!ifa->ifa_local) {
435 inet_free_ifa(ifa);
436 return 0;
437 }
438
439 ifa->ifa_flags &= ~IFA_F_SECONDARY;
440 last_primary = &in_dev->ifa_list;
441
442 for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL;
443 ifap = &ifa1->ifa_next) {
444 if (!(ifa1->ifa_flags & IFA_F_SECONDARY) &&
445 ifa->ifa_scope <= ifa1->ifa_scope)
446 last_primary = &ifa1->ifa_next;
447 if (ifa1->ifa_mask == ifa->ifa_mask &&
448 inet_ifa_match(ifa1->ifa_address, ifa)) {
449 if (ifa1->ifa_local == ifa->ifa_local) {
450 inet_free_ifa(ifa);
451 return -EEXIST;
452 }
453 if (ifa1->ifa_scope != ifa->ifa_scope) {
454 inet_free_ifa(ifa);
455 return -EINVAL;
456 }
457 ifa->ifa_flags |= IFA_F_SECONDARY;
458 }
459 }
460
461 if (!(ifa->ifa_flags & IFA_F_SECONDARY)) {
462 net_srandom(ifa->ifa_local);
463 ifap = last_primary;
464 }
465
466 ifa->ifa_next = *ifap;
467 *ifap = ifa;
468
fd23c3b3
DM		 469 inet_hash_insert(dev_net(in_dev->dev), ifa);
470
5c766d64
JP		 471 cancel_delayed_work(&check_lifetime_work);
472 schedule_delayed_work(&check_lifetime_work, 0);
473
1da177e4
LT		 474 /* Send message first, then call notifier.
475 Notifier will trigger FIB update, so that
476 listeners of netlink will know about new ifaddr */
15e47304 477 rtmsg_ifa(RTM_NEWADDR, ifa, nlh, portid);
e041c683 478 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa);
1da177e4
LT		 479
480 return 0;
481}
482
d6062cbb
TG		 483static int inet_insert_ifa(struct in_ifaddr *ifa)
484{
485 return __inet_insert_ifa(ifa, NULL, 0);
486}
487
1da177e4
LT		 488static int inet_set_ifa(struct net_device *dev, struct in_ifaddr *ifa)
489{
e5ed6399 490 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1da177e4
LT		 491
492 ASSERT_RTNL();
493
494 if (!in_dev) {
71e27da9
HX		 495 inet_free_ifa(ifa);
496 return -ENOBUFS;
1da177e4 497 }
71e27da9 498 ipv4_devconf_setall(in_dev);
1da177e4 499 if (ifa->ifa_dev != in_dev) {
547b792c 500 WARN_ON(ifa->ifa_dev);
1da177e4
LT		 501 in_dev_hold(in_dev);
502 ifa->ifa_dev = in_dev;
503 }
f97c1e0c 504 if (ipv4_is_loopback(ifa->ifa_local))
1da177e4
LT		 505 ifa->ifa_scope = RT_SCOPE_HOST;
506 return inet_insert_ifa(ifa);
507}
508
8723e1b4
ED		 509/* Caller must hold RCU or RTNL :
510 * We dont take a reference on found in_device
511 */
7fee0ca2 512struct in_device *inetdev_by_index(struct net *net, int ifindex)
1da177e4
LT		 513{
514 struct net_device *dev;
515 struct in_device *in_dev = NULL;
c148fc2e
ED		 516
517 rcu_read_lock();
518 dev = dev_get_by_index_rcu(net, ifindex);
1da177e4 519 if (dev)
8723e1b4 520 in_dev = rcu_dereference_rtnl(dev->ip_ptr);
c148fc2e 521 rcu_read_unlock();
1da177e4
LT		 522 return in_dev;
523}
9f9354b9 524EXPORT_SYMBOL(inetdev_by_index);
1da177e4
LT		 525
526/* Called only from RTNL semaphored context. No locks. */
527
60cad5da
AV		 528struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix,
529 __be32 mask)
1da177e4
LT		 530{
531 ASSERT_RTNL();
532
533 for_primary_ifa(in_dev) {
534 if (ifa->ifa_mask == mask && inet_ifa_match(prefix, ifa))
535 return ifa;
536 } endfor_ifa(in_dev);
537 return NULL;
538}
539
661d2967 540static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 541{
3b1e0a65 542 struct net *net = sock_net(skb->sk);
dfdd5fd4 543 struct nlattr *tb[IFA_MAX+1];
1da177e4 544 struct in_device *in_dev;
dfdd5fd4 545 struct ifaddrmsg *ifm;
1da177e4 546 struct in_ifaddr *ifa, **ifap;
dfdd5fd4 547 int err = -EINVAL;
1da177e4
LT		 548
549 ASSERT_RTNL();
550
dfdd5fd4
TG		 551 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy);
552 if (err < 0)
553 goto errout;
554
555 ifm = nlmsg_data(nlh);
7fee0ca2 556 in_dev = inetdev_by_index(net, ifm->ifa_index);
dfdd5fd4
TG		 557 if (in_dev == NULL) {
558 err = -ENODEV;
559 goto errout;
560 }
561
1da177e4
LT		 562 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
563 ifap = &ifa->ifa_next) {
dfdd5fd4 564 if (tb[IFA_LOCAL] &&
a7a628c4 565 ifa->ifa_local != nla_get_be32(tb[IFA_LOCAL]))
dfdd5fd4
TG		 566 continue;
567
568 if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label))
1da177e4 569 continue;
dfdd5fd4
TG		 570
571 if (tb[IFA_ADDRESS] &&
572 (ifm->ifa_prefixlen != ifa->ifa_prefixlen ||
a7a628c4 573 !inet_ifa_match(nla_get_be32(tb[IFA_ADDRESS]), ifa)))
dfdd5fd4
TG		 574 continue;
575
15e47304 576 __inet_del_ifa(in_dev, ifap, 1, nlh, NETLINK_CB(skb).portid);
1da177e4
LT		 577 return 0;
578 }
dfdd5fd4
TG		 579
580 err = -EADDRNOTAVAIL;
581errout:
582 return err;
1da177e4
LT		 583}
584
5c766d64
JP		 585#define INFINITY_LIFE_TIME 0xFFFFFFFF
586
587static void check_lifetime(struct work_struct *work)
588{
589 unsigned long now, next, next_sec, next_sched;
590 struct in_ifaddr *ifa;
c988d1e8 591 struct hlist_node *n;
5c766d64
JP		 592 int i;
593
594 now = jiffies;
595 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
596
5c766d64 597 for (i = 0; i < IN4_ADDR_HSIZE; i++) {
c988d1e8
JP		 598 bool change_needed = false;
599
600 rcu_read_lock();
b67bfe0d 601 hlist_for_each_entry_rcu(ifa, &inet_addr_lst[i], hash) {
5c766d64
JP		 602 unsigned long age;
603
604 if (ifa->ifa_flags & IFA_F_PERMANENT)
605 continue;
606
607 /* We try to batch several events at once. */
608 age = (now - ifa->ifa_tstamp +
609 ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
610
611 if (ifa->ifa_valid_lft != INFINITY_LIFE_TIME &&
612 age >= ifa->ifa_valid_lft) {
c988d1e8 613 change_needed = true;
5c766d64
JP		 614 } else if (ifa->ifa_preferred_lft ==
615 INFINITY_LIFE_TIME) {
616 continue;
617 } else if (age >= ifa->ifa_preferred_lft) {
618 if (time_before(ifa->ifa_tstamp +
619 ifa->ifa_valid_lft * HZ, next))
620 next = ifa->ifa_tstamp +
621 ifa->ifa_valid_lft * HZ;
622
c988d1e8
JP		 623 if (!(ifa->ifa_flags & IFA_F_DEPRECATED))
624 change_needed = true;
5c766d64
JP		 625 } else if (time_before(ifa->ifa_tstamp +
626 ifa->ifa_preferred_lft * HZ,
627 next)) {
628 next = ifa->ifa_tstamp +
629 ifa->ifa_preferred_lft * HZ;
630 }
631 }
c988d1e8
JP		 632 rcu_read_unlock();
633 if (!change_needed)
634 continue;
635 rtnl_lock();
636 hlist_for_each_entry_safe(ifa, n, &inet_addr_lst[i], hash) {
637 unsigned long age;
638
639 if (ifa->ifa_flags & IFA_F_PERMANENT)
640 continue;
641
642 /* We try to batch several events at once. */
643 age = (now - ifa->ifa_tstamp +
644 ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
645
646 if (ifa->ifa_valid_lft != INFINITY_LIFE_TIME &&
647 age >= ifa->ifa_valid_lft) {
648 struct in_ifaddr **ifap;
649
650 for (ifap = &ifa->ifa_dev->ifa_list;
651 *ifap != NULL; ifap = &(*ifap)->ifa_next) {
652 if (*ifap == ifa) {
653 inet_del_ifa(ifa->ifa_dev,
654 ifap, 1);
655 break;
656 }
657 }
658 } else if (ifa->ifa_preferred_lft !=
659 INFINITY_LIFE_TIME &&
660 age >= ifa->ifa_preferred_lft &&
661 !(ifa->ifa_flags & IFA_F_DEPRECATED)) {
662 ifa->ifa_flags |= IFA_F_DEPRECATED;
663 rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0);
664 }
665 }
666 rtnl_unlock();
5c766d64 667 }
5c766d64
JP		 668
669 next_sec = round_jiffies_up(next);
670 next_sched = next;
671
672 /* If rounded timeout is accurate enough, accept it. */
673 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
674 next_sched = next_sec;
675
676 now = jiffies;
677 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
678 if (time_before(next_sched, now + ADDRCONF_TIMER_FUZZ_MAX))
679 next_sched = now + ADDRCONF_TIMER_FUZZ_MAX;
680
681 schedule_delayed_work(&check_lifetime_work, next_sched - now);
682}
683
684static void set_ifa_lifetime(struct in_ifaddr *ifa, __u32 valid_lft,
685 __u32 prefered_lft)
686{
687 unsigned long timeout;
688
689 ifa->ifa_flags &= ~(IFA_F_PERMANENT | IFA_F_DEPRECATED);
690
691 timeout = addrconf_timeout_fixup(valid_lft, HZ);
692 if (addrconf_finite_timeout(timeout))
693 ifa->ifa_valid_lft = timeout;
694 else
695 ifa->ifa_flags |= IFA_F_PERMANENT;
696
697 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
698 if (addrconf_finite_timeout(timeout)) {
699 if (timeout == 0)
700 ifa->ifa_flags |= IFA_F_DEPRECATED;
701 ifa->ifa_preferred_lft = timeout;
702 }
703 ifa->ifa_tstamp = jiffies;
704 if (!ifa->ifa_cstamp)
705 ifa->ifa_cstamp = ifa->ifa_tstamp;
706}
707
708static struct in_ifaddr *rtm_to_ifaddr(struct net *net, struct nlmsghdr *nlh,
709 __u32 *pvalid_lft, __u32 *pprefered_lft)
1da177e4 710{
5c753978
TG		 711 struct nlattr *tb[IFA_MAX+1];
712 struct in_ifaddr *ifa;
713 struct ifaddrmsg *ifm;
1da177e4
LT		 714 struct net_device *dev;
715 struct in_device *in_dev;
7b218574 716 int err;
1da177e4 717
5c753978
TG		 718 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy);
719 if (err < 0)
720 goto errout;
1da177e4 721
5c753978 722 ifm = nlmsg_data(nlh);
7b218574
DL		 723 err = -EINVAL;
724 if (ifm->ifa_prefixlen > 32 || tb[IFA_LOCAL] == NULL)
5c753978 725 goto errout;
1da177e4 726
4b8aa9ab 727 dev = __dev_get_by_index(net, ifm->ifa_index);
7b218574
DL		 728 err = -ENODEV;
729 if (dev == NULL)
5c753978 730 goto errout;
1da177e4 731
5c753978 732 in_dev = __in_dev_get_rtnl(dev);
7b218574
DL		 733 err = -ENOBUFS;
734 if (in_dev == NULL)
71e27da9 735 goto errout;
1da177e4 736
5c753978 737 ifa = inet_alloc_ifa();
7b218574 738 if (ifa == NULL)
5c753978
TG		 739 /*
740 * A potential indev allocation can be left alive, it stays
741 * assigned to its device and is destroy with it.
742 */
5c753978 743 goto errout;
5c753978 744
a4e65d36 745 ipv4_devconf_setall(in_dev);
5c753978
TG		 746 in_dev_hold(in_dev);
747
748 if (tb[IFA_ADDRESS] == NULL)
749 tb[IFA_ADDRESS] = tb[IFA_LOCAL];
1da177e4 750
fd23c3b3 751 INIT_HLIST_NODE(&ifa->hash);
1da177e4
LT		 752 ifa->ifa_prefixlen = ifm->ifa_prefixlen;
753 ifa->ifa_mask = inet_make_mask(ifm->ifa_prefixlen);
1da177e4
LT		 754 ifa->ifa_flags = ifm->ifa_flags;
755 ifa->ifa_scope = ifm->ifa_scope;
5c753978
TG		 756 ifa->ifa_dev = in_dev;
757
a7a628c4
AV		 758 ifa->ifa_local = nla_get_be32(tb[IFA_LOCAL]);
759 ifa->ifa_address = nla_get_be32(tb[IFA_ADDRESS]);
5c753978
TG		 760
761 if (tb[IFA_BROADCAST])
a7a628c4 762 ifa->ifa_broadcast = nla_get_be32(tb[IFA_BROADCAST]);
5c753978 763
5c753978
TG		 764 if (tb[IFA_LABEL])
765 nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ);
1da177e4
LT		 766 else
767 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
768
5c766d64
JP		 769 if (tb[IFA_CACHEINFO]) {
770 struct ifa_cacheinfo *ci;
771
772 ci = nla_data(tb[IFA_CACHEINFO]);
773 if (!ci->ifa_valid || ci->ifa_prefered > ci->ifa_valid) {
774 err = -EINVAL;
b4f55925 775 goto errout_free;
5c766d64
JP		 776 }
777 *pvalid_lft = ci->ifa_valid;
778 *pprefered_lft = ci->ifa_prefered;
779 }
780
5c753978
TG		 781 return ifa;
782
b4f55925
DB		 783errout_free:
784 inet_free_ifa(ifa);
5c753978
TG		 785errout:
786 return ERR_PTR(err);
787}
788
5c766d64
JP		 789static struct in_ifaddr *find_matching_ifa(struct in_ifaddr *ifa)
790{
791 struct in_device *in_dev = ifa->ifa_dev;
792 struct in_ifaddr *ifa1, **ifap;
793
794 if (!ifa->ifa_local)
795 return NULL;
796
797 for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL;
798 ifap = &ifa1->ifa_next) {
799 if (ifa1->ifa_mask == ifa->ifa_mask &&
800 inet_ifa_match(ifa1->ifa_address, ifa) &&
801 ifa1->ifa_local == ifa->ifa_local)
802 return ifa1;
803 }
804 return NULL;
805}
806
661d2967 807static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
5c753978 808{
3b1e0a65 809 struct net *net = sock_net(skb->sk);
5c753978 810 struct in_ifaddr *ifa;
5c766d64
JP		 811 struct in_ifaddr *ifa_existing;
812 __u32 valid_lft = INFINITY_LIFE_TIME;
813 __u32 prefered_lft = INFINITY_LIFE_TIME;
5c753978
TG		 814
815 ASSERT_RTNL();
816
5c766d64 817 ifa = rtm_to_ifaddr(net, nlh, &valid_lft, &prefered_lft);
5c753978
TG		 818 if (IS_ERR(ifa))
819 return PTR_ERR(ifa);
820
5c766d64
JP		 821 ifa_existing = find_matching_ifa(ifa);
822 if (!ifa_existing) {
823 /* It would be best to check for !NLM_F_CREATE here but
824 * userspace alreay relies on not having to provide this.
825 */
826 set_ifa_lifetime(ifa, valid_lft, prefered_lft);
827 return __inet_insert_ifa(ifa, nlh, NETLINK_CB(skb).portid);
828 } else {
829 inet_free_ifa(ifa);
830
831 if (nlh->nlmsg_flags & NLM_F_EXCL ||
832 !(nlh->nlmsg_flags & NLM_F_REPLACE))
833 return -EEXIST;
34e2ed34
JP		 834 ifa = ifa_existing;
835 set_ifa_lifetime(ifa, valid_lft, prefered_lft);
05a324b9
JP		 836 cancel_delayed_work(&check_lifetime_work);
837 schedule_delayed_work(&check_lifetime_work, 0);
34e2ed34
JP		 838 rtmsg_ifa(RTM_NEWADDR, ifa, nlh, NETLINK_CB(skb).portid);
839 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa);
5c766d64
JP		 840 }
841 return 0;
1da177e4
LT		 842}
843
844/*
845 * Determine a default network mask, based on the IP address.
846 */
847
40384999 848static int inet_abc_len(__be32 addr)
1da177e4
LT		 849{
850 int rc = -1; /* Something else, probably a multicast. */
851
f97c1e0c 852 if (ipv4_is_zeronet(addr))
e905a9ed 853 rc = 0;
1da177e4 854 else {
714e85be 855 __u32 haddr = ntohl(addr);
1da177e4 856
714e85be 857 if (IN_CLASSA(haddr))
1da177e4 858 rc = 8;
714e85be 859 else if (IN_CLASSB(haddr))
1da177e4 860 rc = 16;
714e85be 861 else if (IN_CLASSC(haddr))
1da177e4
LT		 862 rc = 24;
863 }
864
e905a9ed 865 return rc;
1da177e4
LT		 866}
867
868
e5b13cb1 869int devinet_ioctl(struct net *net, unsigned int cmd, void __user *arg)
1da177e4
LT		 870{
871 struct ifreq ifr;
872 struct sockaddr_in sin_orig;
873 struct sockaddr_in *sin = (struct sockaddr_in *)&ifr.ifr_addr;
874 struct in_device *in_dev;
875 struct in_ifaddr **ifap = NULL;
876 struct in_ifaddr *ifa = NULL;
877 struct net_device *dev;
878 char *colon;
879 int ret = -EFAULT;
880 int tryaddrmatch = 0;
881
882 /*
883 * Fetch the caller's info block into kernel space
884 */
885
886 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
887 goto out;
888 ifr.ifr_name[IFNAMSIZ - 1] = 0;
889
890 /* save original address for comparison */
891 memcpy(&sin_orig, sin, sizeof(*sin));
892
893 colon = strchr(ifr.ifr_name, ':');
894 if (colon)
895 *colon = 0;
896
e5b13cb1 897 dev_load(net, ifr.ifr_name);
1da177e4 898
132adf54 899 switch (cmd) {
1da177e4
LT		 900 case SIOCGIFADDR: /* Get interface address */
901 case SIOCGIFBRDADDR: /* Get the broadcast address */
902 case SIOCGIFDSTADDR: /* Get the destination address */
903 case SIOCGIFNETMASK: /* Get the netmask for the interface */
904 /* Note that these ioctls will not sleep,
905 so that we do not impose a lock.
906 One day we will be forced to put shlock here (I mean SMP)
907 */
908 tryaddrmatch = (sin_orig.sin_family == AF_INET);
909 memset(sin, 0, sizeof(*sin));
910 sin->sin_family = AF_INET;
911 break;
912
913 case SIOCSIFFLAGS:
bf5b30b8 914 ret = -EPERM;
52e804c6 915 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 916 goto out;
917 break;
918 case SIOCSIFADDR: /* Set interface address (and family) */
919 case SIOCSIFBRDADDR: /* Set the broadcast address */
920 case SIOCSIFDSTADDR: /* Set the destination address */
921 case SIOCSIFNETMASK: /* Set the netmask for the interface */
6fa3eb70 922 case SIOCKILLADDR: /* Nuke all sockets on this address */
bf5b30b8 923 ret = -EPERM;
52e804c6 924 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 925 goto out;
926 ret = -EINVAL;
927 if (sin->sin_family != AF_INET)
928 goto out;
929 break;
930 default:
931 ret = -EINVAL;
932 goto out;
933 }
934
935 rtnl_lock();
936
937 ret = -ENODEV;
9f9354b9
ED		 938 dev = __dev_get_by_name(net, ifr.ifr_name);
939 if (!dev)
1da177e4
LT		 940 goto done;
941
942 if (colon)
943 *colon = ':';
944
9f9354b9
ED		 945 in_dev = __in_dev_get_rtnl(dev);
946 if (in_dev) {
1da177e4
LT		 947 if (tryaddrmatch) {
948 /* Matthias Andree */
949 /* compare label and address (4.4BSD style) */
950 /* note: we only do this for a limited set of ioctls
951 and only if the original address family was AF_INET.
952 This is checked above. */
953 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
954 ifap = &ifa->ifa_next) {
955 if (!strcmp(ifr.ifr_name, ifa->ifa_label) &&
956 sin_orig.sin_addr.s_addr ==
6c91afe1 957 ifa->ifa_local) {
1da177e4
LT		 958 break; /* found */
959 }
960 }
961 }
962 /* we didn't get a match, maybe the application is
963 4.3BSD-style and passed in junk so we fall back to
964 comparing just the label */
965 if (!ifa) {
966 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
967 ifap = &ifa->ifa_next)
968 if (!strcmp(ifr.ifr_name, ifa->ifa_label))
969 break;
970 }
971 }
972
973 ret = -EADDRNOTAVAIL;
6fa3eb70
S		 974 if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS
975 && cmd != SIOCKILLADDR)
1da177e4
LT		 976 goto done;
977
132adf54 978 switch (cmd) {
1da177e4
LT		 979 case SIOCGIFADDR: /* Get interface address */
980 sin->sin_addr.s_addr = ifa->ifa_local;
981 goto rarok;
982
983 case SIOCGIFBRDADDR: /* Get the broadcast address */
984 sin->sin_addr.s_addr = ifa->ifa_broadcast;
985 goto rarok;
986
987 case SIOCGIFDSTADDR: /* Get the destination address */
988 sin->sin_addr.s_addr = ifa->ifa_address;
989 goto rarok;
990
991 case SIOCGIFNETMASK: /* Get the netmask for the interface */
992 sin->sin_addr.s_addr = ifa->ifa_mask;
993 goto rarok;
994
995 case SIOCSIFFLAGS:
996 if (colon) {
997 ret = -EADDRNOTAVAIL;
998 if (!ifa)
999 break;
1000 ret = 0;
1001 if (!(ifr.ifr_flags & IFF_UP))
1002 inet_del_ifa(in_dev, ifap, 1);
1003 break;
1004 }
1005 ret = dev_change_flags(dev, ifr.ifr_flags);
1006 break;
1007
1008 case SIOCSIFADDR: /* Set interface address (and family) */
1009 ret = -EINVAL;
1010 if (inet_abc_len(sin->sin_addr.s_addr) < 0)
1011 break;
1012
1013 if (!ifa) {
1014 ret = -ENOBUFS;
9f9354b9
ED		 1015 ifa = inet_alloc_ifa();
1016 if (!ifa)
1da177e4 1017 break;
c7e2e1d7 1018 INIT_HLIST_NODE(&ifa->hash);
1da177e4
LT		 1019 if (colon)
1020 memcpy(ifa->ifa_label, ifr.ifr_name, IFNAMSIZ);
1021 else
1022 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1023 } else {
1024 ret = 0;
1025 if (ifa->ifa_local == sin->sin_addr.s_addr)
1026 break;
1027 inet_del_ifa(in_dev, ifap, 0);
1028 ifa->ifa_broadcast = 0;
148f9729 1029 ifa->ifa_scope = 0;
1da177e4
LT		 1030 }
1031
1032 ifa->ifa_address = ifa->ifa_local = sin->sin_addr.s_addr;
1033
1034 if (!(dev->flags & IFF_POINTOPOINT)) {
1035 ifa->ifa_prefixlen = inet_abc_len(ifa->ifa_address);
1036 ifa->ifa_mask = inet_make_mask(ifa->ifa_prefixlen);
1037 if ((dev->flags & IFF_BROADCAST) &&
1038 ifa->ifa_prefixlen < 31)
1039 ifa->ifa_broadcast = ifa->ifa_address |
1040 ~ifa->ifa_mask;
1041 } else {
1042 ifa->ifa_prefixlen = 32;
1043 ifa->ifa_mask = inet_make_mask(32);
1044 }
5c766d64 1045 set_ifa_lifetime(ifa, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 1046 ret = inet_set_ifa(dev, ifa);
1047 break;
1048
1049 case SIOCSIFBRDADDR: /* Set the broadcast address */
1050 ret = 0;
1051 if (ifa->ifa_broadcast != sin->sin_addr.s_addr) {
1052 inet_del_ifa(in_dev, ifap, 0);
1053 ifa->ifa_broadcast = sin->sin_addr.s_addr;
1054 inet_insert_ifa(ifa);
1055 }
1056 break;
1057
1058 case SIOCSIFDSTADDR: /* Set the destination address */
1059 ret = 0;
1060 if (ifa->ifa_address == sin->sin_addr.s_addr)
1061 break;
1062 ret = -EINVAL;
1063 if (inet_abc_len(sin->sin_addr.s_addr) < 0)
1064 break;
1065 ret = 0;
1066 inet_del_ifa(in_dev, ifap, 0);
1067 ifa->ifa_address = sin->sin_addr.s_addr;
1068 inet_insert_ifa(ifa);
1069 break;
1070
1071 case SIOCSIFNETMASK: /* Set the netmask for the interface */
1072
1073 /*
1074 * The mask we set must be legal.
1075 */
1076 ret = -EINVAL;
1077 if (bad_mask(sin->sin_addr.s_addr, 0))
1078 break;
1079 ret = 0;
1080 if (ifa->ifa_mask != sin->sin_addr.s_addr) {
a144ea4b 1081 __be32 old_mask = ifa->ifa_mask;
1da177e4
LT		 1082 inet_del_ifa(in_dev, ifap, 0);
1083 ifa->ifa_mask = sin->sin_addr.s_addr;
1084 ifa->ifa_prefixlen = inet_mask_len(ifa->ifa_mask);
1085
1086 /* See if current broadcast address matches
1087 * with current netmask, then recalculate
1088 * the broadcast address. Otherwise it's a
1089 * funny address, so don't touch it since
1090 * the user seems to know what (s)he's doing...
1091 */
1092 if ((dev->flags & IFF_BROADCAST) &&
1093 (ifa->ifa_prefixlen < 31) &&
1094 (ifa->ifa_broadcast ==
dcab5e1e 1095 (ifa->ifa_local|~old_mask))) {
1da177e4
LT		 1096 ifa->ifa_broadcast = (ifa->ifa_local |
1097 ~sin->sin_addr.s_addr);
1098 }
1099 inet_insert_ifa(ifa);
1100 }
1101 break;
6fa3eb70
S		 1102 case SIOCKILLADDR: /* Nuke all connections on this address */
1103 ret = tcp_nuke_addr(net, (struct sockaddr *) sin);
1104 break;
1da177e4
LT		 1105 }
1106done:
1107 rtnl_unlock();
1108out:
1109 return ret;
1110rarok:
1111 rtnl_unlock();
1112 ret = copy_to_user(arg, &ifr, sizeof(struct ifreq)) ? -EFAULT : 0;
1113 goto out;
1114}
1115
1116static int inet_gifconf(struct net_device *dev, char __user *buf, int len)
1117{
e5ed6399 1118 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1da177e4
LT		 1119 struct in_ifaddr *ifa;
1120 struct ifreq ifr;
1121 int done = 0;
1122
9f9354b9 1123 if (!in_dev)
1da177e4
LT		 1124 goto out;
1125
9f9354b9 1126 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1da177e4
LT		 1127 if (!buf) {
1128 done += sizeof(ifr);
1129 continue;
1130 }
1131 if (len < (int) sizeof(ifr))
1132 break;
1133 memset(&ifr, 0, sizeof(struct ifreq));
1134 if (ifa->ifa_label)
1135 strcpy(ifr.ifr_name, ifa->ifa_label);
1136 else
1137 strcpy(ifr.ifr_name, dev->name);
1138
1139 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_family = AF_INET;
1140 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_addr.s_addr =
1141 ifa->ifa_local;
1142
1143 if (copy_to_user(buf, &ifr, sizeof(struct ifreq))) {
1144 done = -EFAULT;
1145 break;
1146 }
1147 buf += sizeof(struct ifreq);
1148 len -= sizeof(struct ifreq);
1149 done += sizeof(struct ifreq);
1150 }
1151out:
1152 return done;
1153}
1154
a61ced5d 1155__be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope)
1da177e4 1156{
a61ced5d 1157 __be32 addr = 0;
1da177e4 1158 struct in_device *in_dev;
c346dca1 1159 struct net *net = dev_net(dev);
1da177e4
LT		 1160
1161 rcu_read_lock();
e5ed6399 1162 in_dev = __in_dev_get_rcu(dev);
1da177e4
LT		 1163 if (!in_dev)
1164 goto no_in_dev;
1165
1166 for_primary_ifa(in_dev) {
1167 if (ifa->ifa_scope > scope)
1168 continue;
1169 if (!dst || inet_ifa_match(dst, ifa)) {
1170 addr = ifa->ifa_local;
1171 break;
1172 }
1173 if (!addr)
1174 addr = ifa->ifa_local;
1175 } endfor_ifa(in_dev);
1da177e4
LT		 1176
1177 if (addr)
c6d14c84 1178 goto out_unlock;
9f9354b9 1179no_in_dev:
1da177e4
LT		 1180
1181 /* Not loopback addresses on loopback should be preferred
1182 in this case. It is importnat that lo is the first interface
1183 in dev_base list.
1184 */
c6d14c84 1185 for_each_netdev_rcu(net, dev) {
9f9354b9
ED		 1186 in_dev = __in_dev_get_rcu(dev);
1187 if (!in_dev)
1da177e4
LT		 1188 continue;
1189
1190 for_primary_ifa(in_dev) {
1191 if (ifa->ifa_scope != RT_SCOPE_LINK &&
1192 ifa->ifa_scope <= scope) {
1193 addr = ifa->ifa_local;
c6d14c84 1194 goto out_unlock;
1da177e4
LT		 1195 }
1196 } endfor_ifa(in_dev);
1197 }
c6d14c84 1198out_unlock:
1da177e4 1199 rcu_read_unlock();
1da177e4
LT		 1200 return addr;
1201}
9f9354b9 1202EXPORT_SYMBOL(inet_select_addr);
1da177e4 1203
60cad5da
AV		 1204static __be32 confirm_addr_indev(struct in_device *in_dev, __be32 dst,
1205 __be32 local, int scope)
1da177e4
LT		 1206{
1207 int same = 0;
a144ea4b 1208 __be32 addr = 0;
1da177e4
LT		 1209
1210 for_ifa(in_dev) {
1211 if (!addr &&
1212 (local == ifa->ifa_local || !local) &&
1213 ifa->ifa_scope <= scope) {
1214 addr = ifa->ifa_local;
1215 if (same)
1216 break;
1217 }
1218 if (!same) {
1219 same = (!local || inet_ifa_match(local, ifa)) &&
1220 (!dst || inet_ifa_match(dst, ifa));
1221 if (same && addr) {
1222 if (local || !dst)
1223 break;
1224 /* Is the selected addr into dst subnet? */
1225 if (inet_ifa_match(addr, ifa))
1226 break;
1227 /* No, then can we use new local src? */
1228 if (ifa->ifa_scope <= scope) {
1229 addr = ifa->ifa_local;
1230 break;
1231 }
1232 /* search for large dst subnet for addr */
1233 same = 0;
1234 }
1235 }
1236 } endfor_ifa(in_dev);
1237
9f9354b9 1238 return same ? addr : 0;
1da177e4
LT		 1239}
1240
1241/*
1242 * Confirm that local IP address exists using wildcards:
9bd85e32 1243 * - in_dev: only on this interface, 0=any interface
1da177e4
LT		 1244 * - dst: only in the same subnet as dst, 0=any dst
1245 * - local: address, 0=autoselect the local address
1246 * - scope: maximum allowed scope value for the local address
1247 */
9bd85e32
DL		 1248__be32 inet_confirm_addr(struct in_device *in_dev,
1249 __be32 dst, __be32 local, int scope)
1da177e4 1250{
60cad5da 1251 __be32 addr = 0;
9bd85e32 1252 struct net_device *dev;
39a6d063 1253 struct net *net;
1da177e4 1254
39a6d063 1255 if (scope != RT_SCOPE_LINK)
9bd85e32 1256 return confirm_addr_indev(in_dev, dst, local, scope);
1da177e4 1257
c346dca1 1258 net = dev_net(in_dev->dev);
1da177e4 1259 rcu_read_lock();
c6d14c84 1260 for_each_netdev_rcu(net, dev) {
9f9354b9
ED		 1261 in_dev = __in_dev_get_rcu(dev);
1262 if (in_dev) {
1da177e4
LT		 1263 addr = confirm_addr_indev(in_dev, dst, local, scope);
1264 if (addr)
1265 break;
1266 }
1267 }
1268 rcu_read_unlock();
1da177e4
LT		 1269
1270 return addr;
1271}
eaddcd76 1272EXPORT_SYMBOL(inet_confirm_addr);
1da177e4
LT		 1273
1274/*
1275 * Device notifier
1276 */
1277
1278int register_inetaddr_notifier(struct notifier_block *nb)
1279{
e041c683 1280 return blocking_notifier_chain_register(&inetaddr_chain, nb);
1da177e4 1281}
9f9354b9 1282EXPORT_SYMBOL(register_inetaddr_notifier);
1da177e4
LT		 1283
1284int unregister_inetaddr_notifier(struct notifier_block *nb)
1285{
e041c683 1286 return blocking_notifier_chain_unregister(&inetaddr_chain, nb);
1da177e4 1287}
9f9354b9 1288EXPORT_SYMBOL(unregister_inetaddr_notifier);
1da177e4 1289
9f9354b9
ED		 1290/* Rename ifa_labels for a device name change. Make some effort to preserve
1291 * existing alias numbering and to create unique labels if possible.
1da177e4
LT		 1292*/
1293static void inetdev_changename(struct net_device *dev, struct in_device *in_dev)
e905a9ed 1294{
1da177e4
LT		 1295 struct in_ifaddr *ifa;
1296 int named = 0;
1297
e905a9ed
YH		 1298 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1299 char old[IFNAMSIZ], *dot;
1da177e4
LT		 1300
1301 memcpy(old, ifa->ifa_label, IFNAMSIZ);
e905a9ed 1302 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1da177e4 1303 if (named++ == 0)
573bf470 1304 goto skip;
44344b2a 1305 dot = strchr(old, ':');
e905a9ed
YH		 1306 if (dot == NULL) {
1307 sprintf(old, ":%d", named);
1da177e4
LT		 1308 dot = old;
1309 }
9f9354b9 1310 if (strlen(dot) + strlen(dev->name) < IFNAMSIZ)
e905a9ed 1311 strcat(ifa->ifa_label, dot);
9f9354b9 1312 else
e905a9ed 1313 strcpy(ifa->ifa_label + (IFNAMSIZ - strlen(dot) - 1), dot);
573bf470
TG		 1314skip:
1315 rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0);
e905a9ed
YH		 1316 }
1317}
1da177e4 1318
40384999 1319static bool inetdev_valid_mtu(unsigned int mtu)
06770843
BL		 1320{
1321 return mtu >= 68;
1322}
1323
d11327ad
IC		 1324static void inetdev_send_gratuitous_arp(struct net_device *dev,
1325 struct in_device *in_dev)
1326
1327{
b76d0789 1328 struct in_ifaddr *ifa;
d11327ad 1329
b76d0789
ZK		 1330 for (ifa = in_dev->ifa_list; ifa;
1331 ifa = ifa->ifa_next) {
1332 arp_send(ARPOP_REQUEST, ETH_P_ARP,
1333 ifa->ifa_local, dev,
1334 ifa->ifa_local, NULL,
1335 dev->dev_addr, NULL);
1336 }
d11327ad
IC		 1337}
1338
1da177e4
LT		 1339/* Called only under RTNL semaphore */
1340
1341static int inetdev_event(struct notifier_block *this, unsigned long event,
1342 void *ptr)
1343{
1344 struct net_device *dev = ptr;
748e2d93 1345 struct in_device *in_dev = __in_dev_get_rtnl(dev);
0115e8e3 1346
1da177e4
LT		 1347 ASSERT_RTNL();
1348
1349 if (!in_dev) {
8030f544 1350 if (event == NETDEV_REGISTER) {
1da177e4 1351 in_dev = inetdev_init(dev);
b217d616
HX		 1352 if (!in_dev)
1353 return notifier_from_errno(-ENOMEM);
0cc217e1 1354 if (dev->flags & IFF_LOOPBACK) {
42f811b8
HX		 1355 IN_DEV_CONF_SET(in_dev, NOXFRM, 1);
1356 IN_DEV_CONF_SET(in_dev, NOPOLICY, 1);
8030f544 1357 }
06770843
BL		 1358 } else if (event == NETDEV_CHANGEMTU) {
1359 /* Re-enabling IP */
1360 if (inetdev_valid_mtu(dev->mtu))
1361 in_dev = inetdev_init(dev);
1da177e4
LT		 1362 }
1363 goto out;
1364 }
1365
1366 switch (event) {
1367 case NETDEV_REGISTER:
91df42be 1368 pr_debug("%s: bug\n", __func__);
a9b3cd7f 1369 RCU_INIT_POINTER(dev->ip_ptr, NULL);
1da177e4
LT		 1370 break;
1371 case NETDEV_UP:
06770843 1372 if (!inetdev_valid_mtu(dev->mtu))
1da177e4 1373 break;
0cc217e1 1374 if (dev->flags & IFF_LOOPBACK) {
9f9354b9
ED		 1375 struct in_ifaddr *ifa = inet_alloc_ifa();
1376
1377 if (ifa) {
fd23c3b3 1378 INIT_HLIST_NODE(&ifa->hash);
1da177e4
LT		 1379 ifa->ifa_local =
1380 ifa->ifa_address = htonl(INADDR_LOOPBACK);
1381 ifa->ifa_prefixlen = 8;
1382 ifa->ifa_mask = inet_make_mask(8);
1383 in_dev_hold(in_dev);
1384 ifa->ifa_dev = in_dev;
1385 ifa->ifa_scope = RT_SCOPE_HOST;
1386 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
5c766d64
JP		 1387 set_ifa_lifetime(ifa, INFINITY_LIFE_TIME,
1388 INFINITY_LIFE_TIME);
1da177e4
LT		 1389 inet_insert_ifa(ifa);
1390 }
1391 }
1392 ip_mc_up(in_dev);
eefef1cf
SH		 1393 /* fall through */
1394 case NETDEV_CHANGEADDR:
d11327ad
IC		 1395 if (!IN_DEV_ARP_NOTIFY(in_dev))
1396 break;
1397 /* fall through */
1398 case NETDEV_NOTIFY_PEERS:
a21090cf 1399 /* Send gratuitous ARP to notify of link change */
d11327ad 1400 inetdev_send_gratuitous_arp(dev, in_dev);
1da177e4
LT		 1401 break;
1402 case NETDEV_DOWN:
1403 ip_mc_down(in_dev);
1404 break;
93d9b7d7 1405 case NETDEV_PRE_TYPE_CHANGE:
75c78500
MS		 1406 ip_mc_unmap(in_dev);
1407 break;
93d9b7d7 1408 case NETDEV_POST_TYPE_CHANGE:
75c78500
MS		 1409 ip_mc_remap(in_dev);
1410 break;
1da177e4 1411 case NETDEV_CHANGEMTU:
06770843 1412 if (inetdev_valid_mtu(dev->mtu))
1da177e4 1413 break;
06770843 1414 /* disable IP when MTU is not enough */
1da177e4
LT		 1415 case NETDEV_UNREGISTER:
1416 inetdev_destroy(in_dev);
1417 break;
1418 case NETDEV_CHANGENAME:
1419 /* Do not notify about label change, this event is
1420 * not interesting to applications using netlink.
1421 */
1422 inetdev_changename(dev, in_dev);
1423
51602b2a 1424 devinet_sysctl_unregister(in_dev);
66f27a52 1425 devinet_sysctl_register(in_dev);
1da177e4
LT		 1426 break;
1427 }
1428out:
1429 return NOTIFY_DONE;
1430}
1431
1432static struct notifier_block ip_netdev_notifier = {
539afedf 1433 .notifier_call = inetdev_event,
1da177e4
LT		 1434};
1435
40384999 1436static size_t inet_nlmsg_size(void)
339bf98f
TG		 1437{
1438 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
1439 + nla_total_size(4) /* IFA_ADDRESS */
1440 + nla_total_size(4) /* IFA_LOCAL */
1441 + nla_total_size(4) /* IFA_BROADCAST */
cb58d094
GU		 1442 + nla_total_size(IFNAMSIZ) /* IFA_LABEL */
1443 + nla_total_size(sizeof(struct ifa_cacheinfo)); /* IFA_CACHEINFO */
339bf98f
TG		 1444}
1445
5c766d64
JP		 1446static inline u32 cstamp_delta(unsigned long cstamp)
1447{
1448 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
1449}
1450
1451static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
1452 unsigned long tstamp, u32 preferred, u32 valid)
1453{
1454 struct ifa_cacheinfo ci;
1455
1456 ci.cstamp = cstamp_delta(cstamp);
1457 ci.tstamp = cstamp_delta(tstamp);
1458 ci.ifa_prefered = preferred;
1459 ci.ifa_valid = valid;
1460
1461 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
1462}
1463
1da177e4 1464static int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa,
15e47304 1465 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4
LT		 1466{
1467 struct ifaddrmsg *ifm;
1468 struct nlmsghdr *nlh;
5c766d64 1469 u32 preferred, valid;
1da177e4 1470
15e47304 1471 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*ifm), flags);
47f68512 1472 if (nlh == NULL)
26932566 1473 return -EMSGSIZE;
47f68512
TG		 1474
1475 ifm = nlmsg_data(nlh);
1da177e4
LT		 1476 ifm->ifa_family = AF_INET;
1477 ifm->ifa_prefixlen = ifa->ifa_prefixlen;
5c766d64 1478 ifm->ifa_flags = ifa->ifa_flags;
1da177e4
LT		 1479 ifm->ifa_scope = ifa->ifa_scope;
1480 ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
47f68512 1481
5c766d64
JP		 1482 if (!(ifm->ifa_flags & IFA_F_PERMANENT)) {
1483 preferred = ifa->ifa_preferred_lft;
1484 valid = ifa->ifa_valid_lft;
1485 if (preferred != INFINITY_LIFE_TIME) {
1486 long tval = (jiffies - ifa->ifa_tstamp) / HZ;
1487
1488 if (preferred > tval)
1489 preferred -= tval;
1490 else
1491 preferred = 0;
1492 if (valid != INFINITY_LIFE_TIME) {
1493 if (valid > tval)
1494 valid -= tval;
1495 else
1496 valid = 0;
1497 }
1498 }
1499 } else {
1500 preferred = INFINITY_LIFE_TIME;
1501 valid = INFINITY_LIFE_TIME;
1502 }
f3756b79
DM		 1503 if ((ifa->ifa_address &&
1504 nla_put_be32(skb, IFA_ADDRESS, ifa->ifa_address)) ||
1505 (ifa->ifa_local &&
1506 nla_put_be32(skb, IFA_LOCAL, ifa->ifa_local)) ||
1507 (ifa->ifa_broadcast &&
1508 nla_put_be32(skb, IFA_BROADCAST, ifa->ifa_broadcast)) ||
1509 (ifa->ifa_label[0] &&
5c766d64
JP		 1510 nla_put_string(skb, IFA_LABEL, ifa->ifa_label)) ||
1511 put_cacheinfo(skb, ifa->ifa_cstamp, ifa->ifa_tstamp,
1512 preferred, valid))
f3756b79 1513 goto nla_put_failure;
1da177e4 1514
47f68512
TG		 1515 return nlmsg_end(skb, nlh);
1516
1517nla_put_failure:
26932566
PM		 1518 nlmsg_cancel(skb, nlh);
1519 return -EMSGSIZE;
1da177e4
LT		 1520}
1521
1522static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
1523{
3b1e0a65 1524 struct net *net = sock_net(skb->sk);
eec4df98
ED		 1525 int h, s_h;
1526 int idx, s_idx;
1527 int ip_idx, s_ip_idx;
1da177e4
LT		 1528 struct net_device *dev;
1529 struct in_device *in_dev;
1530 struct in_ifaddr *ifa;
eec4df98 1531 struct hlist_head *head;
1da177e4 1532
eec4df98
ED		 1533 s_h = cb->args[0];
1534 s_idx = idx = cb->args[1];
1535 s_ip_idx = ip_idx = cb->args[2];
1536
1537 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1538 idx = 0;
1539 head = &net->dev_index_head[h];
1540 rcu_read_lock();
0465277f
ND		 1541 cb->seq = atomic_read(&net->ipv4.dev_addr_genid) ^
1542 net->dev_base_seq;
b67bfe0d 1543 hlist_for_each_entry_rcu(dev, head, index_hlist) {
eec4df98
ED		 1544 if (idx < s_idx)
1545 goto cont;
4b97efdf 1546 if (h > s_h || idx > s_idx)
eec4df98
ED		 1547 s_ip_idx = 0;
1548 in_dev = __in_dev_get_rcu(dev);
1549 if (!in_dev)
1550 goto cont;
1da177e4 1551
eec4df98
ED		 1552 for (ifa = in_dev->ifa_list, ip_idx = 0; ifa;
1553 ifa = ifa->ifa_next, ip_idx++) {
1554 if (ip_idx < s_ip_idx)
1555 continue;
1556 if (inet_fill_ifaddr(skb, ifa,
15e47304 1557 NETLINK_CB(cb->skb).portid,
1da177e4 1558 cb->nlh->nlmsg_seq,
eec4df98
ED		 1559 RTM_NEWADDR, NLM_F_MULTI) <= 0) {
1560 rcu_read_unlock();
1561 goto done;
1562 }
0465277f 1563 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
eec4df98 1564 }
7562f876 1565cont:
eec4df98
ED		 1566 idx++;
1567 }
1568 rcu_read_unlock();
1da177e4
LT		 1569 }
1570
1571done:
eec4df98
ED		 1572 cb->args[0] = h;
1573 cb->args[1] = idx;
1574 cb->args[2] = ip_idx;
1da177e4
LT		 1575
1576 return skb->len;
1577}
1578
539afedf 1579static void rtmsg_ifa(int event, struct in_ifaddr *ifa, struct nlmsghdr *nlh,
15e47304 1580 u32 portid)
1da177e4 1581{
47f68512 1582 struct sk_buff *skb;
d6062cbb
TG		 1583 u32 seq = nlh ? nlh->nlmsg_seq : 0;
1584 int err = -ENOBUFS;
4b8aa9ab 1585 struct net *net;
1da177e4 1586
c346dca1 1587 net = dev_net(ifa->ifa_dev->dev);
339bf98f 1588 skb = nlmsg_new(inet_nlmsg_size(), GFP_KERNEL);
47f68512 1589 if (skb == NULL)
d6062cbb
TG		 1590 goto errout;
1591
15e47304 1592 err = inet_fill_ifaddr(skb, ifa, portid, seq, event, 0);
26932566
PM		 1593 if (err < 0) {
1594 /* -EMSGSIZE implies BUG in inet_nlmsg_size() */
1595 WARN_ON(err == -EMSGSIZE);
1596 kfree_skb(skb);
1597 goto errout;
1598 }
15e47304 1599 rtnl_notify(skb, net, portid, RTNLGRP_IPV4_IFADDR, nlh, GFP_KERNEL);
1ce85fe4 1600 return;
d6062cbb
TG		 1601errout:
1602 if (err < 0)
4b8aa9ab 1603 rtnl_set_sk_err(net, RTNLGRP_IPV4_IFADDR, err);
1da177e4
LT		 1604}
1605
9f0f7272
TG		 1606static size_t inet_get_link_af_size(const struct net_device *dev)
1607{
1fc19aff 1608 struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr);
9f0f7272
TG		 1609
1610 if (!in_dev)
1611 return 0;
1612
1613 return nla_total_size(IPV4_DEVCONF_MAX * 4); /* IFLA_INET_CONF */
1614}
1615
1616static int inet_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
1617{
1fc19aff 1618 struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr);
9f0f7272
TG		 1619 struct nlattr *nla;
1620 int i;
1621
1622 if (!in_dev)
1623 return -ENODATA;
1624
1625 nla = nla_reserve(skb, IFLA_INET_CONF, IPV4_DEVCONF_MAX * 4);
1626 if (nla == NULL)
1627 return -EMSGSIZE;
1628
1629 for (i = 0; i < IPV4_DEVCONF_MAX; i++)
1630 ((u32 *) nla_data(nla))[i] = in_dev->cnf.data[i];
1631
1632 return 0;
1633}
1634
1635static const struct nla_policy inet_af_policy[IFLA_INET_MAX+1] = {
1636 [IFLA_INET_CONF] = { .type = NLA_NESTED },
1637};
1638
cf7afbfe
TG		 1639static int inet_validate_link_af(const struct net_device *dev,
1640 const struct nlattr *nla)
9f0f7272 1641{
9f0f7272
TG		 1642 struct nlattr *a, *tb[IFLA_INET_MAX+1];
1643 int err, rem;
1644
f7fce74e 1645 if (dev && !__in_dev_get_rtnl(dev))
cf7afbfe 1646 return -EAFNOSUPPORT;
9f0f7272
TG		 1647
1648 err = nla_parse_nested(tb, IFLA_INET_MAX, nla, inet_af_policy);
1649 if (err < 0)
1650 return err;
1651
1652 if (tb[IFLA_INET_CONF]) {
1653 nla_for_each_nested(a, tb[IFLA_INET_CONF], rem) {
1654 int cfgid = nla_type(a);
1655
1656 if (nla_len(a) < 4)
1657 return -EINVAL;
1658
1659 if (cfgid <= 0 || cfgid > IPV4_DEVCONF_MAX)
1660 return -EINVAL;
1661 }
1662 }
1663
cf7afbfe
TG		 1664 return 0;
1665}
1666
1667static int inet_set_link_af(struct net_device *dev, const struct nlattr *nla)
1668{
f7fce74e 1669 struct in_device *in_dev = __in_dev_get_rtnl(dev);
cf7afbfe
TG		 1670 struct nlattr *a, *tb[IFLA_INET_MAX+1];
1671 int rem;
1672
1673 if (!in_dev)
1674 return -EAFNOSUPPORT;
1675
1676 if (nla_parse_nested(tb, IFLA_INET_MAX, nla, NULL) < 0)
1677 BUG();
1678
9f0f7272
TG		 1679 if (tb[IFLA_INET_CONF]) {
1680 nla_for_each_nested(a, tb[IFLA_INET_CONF], rem)
1681 ipv4_devconf_set(in_dev, nla_type(a), nla_get_u32(a));
1682 }
1683
1684 return 0;
1685}
1686
edc9e748
ND		 1687static int inet_netconf_msgsize_devconf(int type)
1688{
1689 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
1690 + nla_total_size(4); /* NETCONFA_IFINDEX */
1691
9e551110
ND		 1692 /* type -1 is used for ALL */
1693 if (type == -1 || type == NETCONFA_FORWARDING)
edc9e748 1694 size += nla_total_size(4);
cc535dfb
ND		 1695 if (type == -1 || type == NETCONFA_RP_FILTER)
1696 size += nla_total_size(4);
d67b8c61
ND		 1697 if (type == -1 || type == NETCONFA_MC_FORWARDING)
1698 size += nla_total_size(4);
edc9e748
ND		 1699
1700 return size;
1701}
1702
1703static int inet_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
1704 struct ipv4_devconf *devconf, u32 portid,
1705 u32 seq, int event, unsigned int flags,
1706 int type)
1707{
1708 struct nlmsghdr *nlh;
1709 struct netconfmsg *ncm;
1710
1711 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
1712 flags);
1713 if (nlh == NULL)
1714 return -EMSGSIZE;
1715
1716 ncm = nlmsg_data(nlh);
1717 ncm->ncm_family = AF_INET;
1718
1719 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
1720 goto nla_put_failure;
1721
9e551110
ND		 1722 /* type -1 is used for ALL */
1723 if ((type == -1 || type == NETCONFA_FORWARDING) &&
edc9e748
ND		 1724 nla_put_s32(skb, NETCONFA_FORWARDING,
1725 IPV4_DEVCONF(*devconf, FORWARDING)) < 0)
1726 goto nla_put_failure;
cc535dfb
ND		 1727 if ((type == -1 || type == NETCONFA_RP_FILTER) &&
1728 nla_put_s32(skb, NETCONFA_RP_FILTER,
1729 IPV4_DEVCONF(*devconf, RP_FILTER)) < 0)
1730 goto nla_put_failure;
d67b8c61
ND		 1731 if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
1732 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
1733 IPV4_DEVCONF(*devconf, MC_FORWARDING)) < 0)
1734 goto nla_put_failure;
edc9e748
ND		 1735
1736 return nlmsg_end(skb, nlh);
1737
1738nla_put_failure:
1739 nlmsg_cancel(skb, nlh);
1740 return -EMSGSIZE;
1741}
1742
d67b8c61
ND		 1743void inet_netconf_notify_devconf(struct net *net, int type, int ifindex,
1744 struct ipv4_devconf *devconf)
edc9e748
ND		 1745{
1746 struct sk_buff *skb;
1747 int err = -ENOBUFS;
1748
1749 skb = nlmsg_new(inet_netconf_msgsize_devconf(type), GFP_ATOMIC);
1750 if (skb == NULL)
1751 goto errout;
1752
1753 err = inet_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
1754 RTM_NEWNETCONF, 0, type);
1755 if (err < 0) {
1756 /* -EMSGSIZE implies BUG in inet_netconf_msgsize_devconf() */
1757 WARN_ON(err == -EMSGSIZE);
1758 kfree_skb(skb);
1759 goto errout;
1760 }
1761 rtnl_notify(skb, net, 0, RTNLGRP_IPV4_NETCONF, NULL, GFP_ATOMIC);
1762 return;
1763errout:
1764 if (err < 0)
1765 rtnl_set_sk_err(net, RTNLGRP_IPV4_NETCONF, err);
1766}
1767
9e551110
ND		 1768static const struct nla_policy devconf_ipv4_policy[NETCONFA_MAX+1] = {
1769 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
1770 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
cc535dfb 1771 [NETCONFA_RP_FILTER] = { .len = sizeof(int) },
9e551110
ND		 1772};
1773
1774static int inet_netconf_get_devconf(struct sk_buff *in_skb,
661d2967 1775 struct nlmsghdr *nlh)
9e551110
ND		 1776{
1777 struct net *net = sock_net(in_skb->sk);
1778 struct nlattr *tb[NETCONFA_MAX+1];
1779 struct netconfmsg *ncm;
1780 struct sk_buff *skb;
1781 struct ipv4_devconf *devconf;
1782 struct in_device *in_dev;
1783 struct net_device *dev;
1784 int ifindex;
1785 int err;
1786
1787 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
1788 devconf_ipv4_policy);
1789 if (err < 0)
1790 goto errout;
1791
1792 err = EINVAL;
1793 if (!tb[NETCONFA_IFINDEX])
1794 goto errout;
1795
1796 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
1797 switch (ifindex) {
1798 case NETCONFA_IFINDEX_ALL:
1799 devconf = net->ipv4.devconf_all;
1800 break;
1801 case NETCONFA_IFINDEX_DEFAULT:
1802 devconf = net->ipv4.devconf_dflt;
1803 break;
1804 default:
1805 dev = __dev_get_by_index(net, ifindex);
1806 if (dev == NULL)
1807 goto errout;
1808 in_dev = __in_dev_get_rtnl(dev);
1809 if (in_dev == NULL)
1810 goto errout;
1811 devconf = &in_dev->cnf;
1812 break;
1813 }
1814
1815 err = -ENOBUFS;
1816 skb = nlmsg_new(inet_netconf_msgsize_devconf(-1), GFP_ATOMIC);
1817 if (skb == NULL)
1818 goto errout;
1819
1820 err = inet_netconf_fill_devconf(skb, ifindex, devconf,
1821 NETLINK_CB(in_skb).portid,
1822 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
1823 -1);
1824 if (err < 0) {
1825 /* -EMSGSIZE implies BUG in inet_netconf_msgsize_devconf() */
1826 WARN_ON(err == -EMSGSIZE);
1827 kfree_skb(skb);
1828 goto errout;
1829 }
1830 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
1831errout:
1832 return err;
1833}
1834
7a674200
ND		 1835static int inet_netconf_dump_devconf(struct sk_buff *skb,
1836 struct netlink_callback *cb)
1837{
1838 struct net *net = sock_net(skb->sk);
1839 int h, s_h;
1840 int idx, s_idx;
1841 struct net_device *dev;
1842 struct in_device *in_dev;
1843 struct hlist_head *head;
1844
1845 s_h = cb->args[0];
1846 s_idx = idx = cb->args[1];
1847
1848 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1849 idx = 0;
1850 head = &net->dev_index_head[h];
1851 rcu_read_lock();
0465277f
ND		 1852 cb->seq = atomic_read(&net->ipv4.dev_addr_genid) ^
1853 net->dev_base_seq;
7a674200
ND		 1854 hlist_for_each_entry_rcu(dev, head, index_hlist) {
1855 if (idx < s_idx)
1856 goto cont;
1857 in_dev = __in_dev_get_rcu(dev);
1858 if (!in_dev)
1859 goto cont;
1860
1861 if (inet_netconf_fill_devconf(skb, dev->ifindex,
1862 &in_dev->cnf,
1863 NETLINK_CB(cb->skb).portid,
1864 cb->nlh->nlmsg_seq,
1865 RTM_NEWNETCONF,
1866 NLM_F_MULTI,
1867 -1) <= 0) {
1868 rcu_read_unlock();
1869 goto done;
1870 }
0465277f 1871 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7a674200
ND		 1872cont:
1873 idx++;
1874 }
1875 rcu_read_unlock();
1876 }
1877 if (h == NETDEV_HASHENTRIES) {
1878 if (inet_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
1879 net->ipv4.devconf_all,
1880 NETLINK_CB(cb->skb).portid,
1881 cb->nlh->nlmsg_seq,
1882 RTM_NEWNETCONF, NLM_F_MULTI,
1883 -1) <= 0)
1884 goto done;
1885 else
1886 h++;
1887 }
1888 if (h == NETDEV_HASHENTRIES + 1) {
1889 if (inet_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
1890 net->ipv4.devconf_dflt,
1891 NETLINK_CB(cb->skb).portid,
1892 cb->nlh->nlmsg_seq,
1893 RTM_NEWNETCONF, NLM_F_MULTI,
1894 -1) <= 0)
1895 goto done;
1896 else
1897 h++;
1898 }
1899done:
1900 cb->args[0] = h;
1901 cb->args[1] = idx;
1902
1903 return skb->len;
1904}
1905
1da177e4
LT		 1906#ifdef CONFIG_SYSCTL
1907
c0ce9fb3 1908static void devinet_copy_dflt_conf(struct net *net, int i)
31be3085
HX		 1909{
1910 struct net_device *dev;
1911
c6d14c84
ED		 1912 rcu_read_lock();
1913 for_each_netdev_rcu(net, dev) {
31be3085 1914 struct in_device *in_dev;
c6d14c84 1915
31be3085
HX		 1916 in_dev = __in_dev_get_rcu(dev);
1917 if (in_dev && !test_bit(i, in_dev->cnf.state))
9355bbd6 1918 in_dev->cnf.data[i] = net->ipv4.devconf_dflt->data[i];
31be3085 1919 }
c6d14c84 1920 rcu_read_unlock();
31be3085
HX		 1921}
1922
c6d14c84 1923/* called with RTNL locked */
c0ce9fb3 1924static void inet_forward_change(struct net *net)
68dd299b
PE		 1925{
1926 struct net_device *dev;
586f1211 1927 int on = IPV4_DEVCONF_ALL(net, FORWARDING);
68dd299b 1928
586f1211 1929 IPV4_DEVCONF_ALL(net, ACCEPT_REDIRECTS) = !on;
9355bbd6 1930 IPV4_DEVCONF_DFLT(net, FORWARDING) = on;
edc9e748
ND		 1931 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING,
1932 NETCONFA_IFINDEX_ALL,
1933 net->ipv4.devconf_all);
1934 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING,
1935 NETCONFA_IFINDEX_DEFAULT,
1936 net->ipv4.devconf_dflt);
68dd299b 1937
c0ce9fb3 1938 for_each_netdev(net, dev) {
68dd299b 1939 struct in_device *in_dev;
0187bdfb
BH		 1940 if (on)
1941 dev_disable_lro(dev);
68dd299b
PE		 1942 rcu_read_lock();
1943 in_dev = __in_dev_get_rcu(dev);
edc9e748 1944 if (in_dev) {
68dd299b 1945 IN_DEV_CONF_SET(in_dev, FORWARDING, on);
edc9e748
ND		 1946 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING,
1947 dev->ifindex, &in_dev->cnf);
1948 }
68dd299b
PE		 1949 rcu_read_unlock();
1950 }
68dd299b
PE		 1951}
1952
31be3085 1953static int devinet_conf_proc(ctl_table *ctl, int write,
8d65af78 1954 void __user *buffer,
31be3085
HX		 1955 size_t *lenp, loff_t *ppos)
1956{
d01ff0a0 1957 int old_value = *(int *)ctl->data;
8d65af78 1958 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
d01ff0a0 1959 int new_value = *(int *)ctl->data;
31be3085
HX		 1960
1961 if (write) {
1962 struct ipv4_devconf *cnf = ctl->extra1;
c0ce9fb3 1963 struct net *net = ctl->extra2;
31be3085
HX		 1964 int i = (int *)ctl->data - cnf->data;
1965
1966 set_bit(i, cnf->state);
1967
9355bbd6 1968 if (cnf == net->ipv4.devconf_dflt)
c0ce9fb3 1969 devinet_copy_dflt_conf(net, i);
d0daebc3
TG		 1970 if (i == IPV4_DEVCONF_ACCEPT_LOCAL - 1 ||
1971 i == IPV4_DEVCONF_ROUTE_LOCALNET - 1)
d01ff0a0 1972 if ((new_value == 0) && (old_value != 0))
4ccfe6d4 1973 rt_cache_flush(net);
cc535dfb
ND		 1974 if (i == IPV4_DEVCONF_RP_FILTER - 1 &&
1975 new_value != old_value) {
1976 int ifindex;
1977
1978 if (cnf == net->ipv4.devconf_dflt)
1979 ifindex = NETCONFA_IFINDEX_DEFAULT;
1980 else if (cnf == net->ipv4.devconf_all)
1981 ifindex = NETCONFA_IFINDEX_ALL;
1982 else {
1983 struct in_device *idev =
1984 container_of(cnf, struct in_device,
1985 cnf);
1986 ifindex = idev->dev->ifindex;
1987 }
1988 inet_netconf_notify_devconf(net, NETCONFA_RP_FILTER,
1989 ifindex, cnf);
1990 }
31be3085
HX		 1991 }
1992
1993 return ret;
1994}
1995
1da177e4 1996static int devinet_sysctl_forward(ctl_table *ctl, int write,
8d65af78 1997 void __user *buffer,
1da177e4
LT		 1998 size_t *lenp, loff_t *ppos)
1999{
2000 int *valp = ctl->data;
2001 int val = *valp;
88af182e 2002 loff_t pos = *ppos;
8d65af78 2003 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
1da177e4
LT		 2004
2005 if (write && *valp != val) {
c0ce9fb3
PE		 2006 struct net *net = ctl->extra2;
2007
0187bdfb 2008 if (valp != &IPV4_DEVCONF_DFLT(net, FORWARDING)) {
88af182e
EB		 2009 if (!rtnl_trylock()) {
2010 /* Restore the original values before restarting */
2011 *valp = val;
2012 *ppos = pos;
9b8adb5e 2013 return restart_syscall();
88af182e 2014 }
0187bdfb
BH		 2015 if (valp == &IPV4_DEVCONF_ALL(net, FORWARDING)) {
2016 inet_forward_change(net);
edc9e748 2017 } else {
0187bdfb
BH		 2018 struct ipv4_devconf *cnf = ctl->extra1;
2019 struct in_device *idev =
2020 container_of(cnf, struct in_device, cnf);
edc9e748
ND		 2021 if (*valp)
2022 dev_disable_lro(idev->dev);
2023 inet_netconf_notify_devconf(net,
2024 NETCONFA_FORWARDING,
2025 idev->dev->ifindex,
2026 cnf);
0187bdfb
BH		 2027 }
2028 rtnl_unlock();
4ccfe6d4 2029 rt_cache_flush(net);
edc9e748
ND		 2030 } else
2031 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING,
2032 NETCONFA_IFINDEX_DEFAULT,
2033 net->ipv4.devconf_dflt);
1da177e4
LT		 2034 }
2035
2036 return ret;
2037}
2038
323e126f
DM		 2039static int ipv4_doint_and_flush(ctl_table *ctl, int write,
2040 void __user *buffer,
2041 size_t *lenp, loff_t *ppos)
1da177e4
LT		 2042{
2043 int *valp = ctl->data;
2044 int val = *valp;
8d65af78 2045 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
76e6ebfb 2046 struct net *net = ctl->extra2;
1da177e4
LT		 2047
2048 if (write && *valp != val)
4ccfe6d4 2049 rt_cache_flush(net);
1da177e4
LT		 2050
2051 return ret;
2052}
2053
f8572d8f 2054#define DEVINET_SYSCTL_ENTRY(attr, name, mval, proc) \
42f811b8 2055 { \
42f811b8
HX		 2056 .procname = name, \
2057 .data = ipv4_devconf.data + \
02291680 2058 IPV4_DEVCONF_ ## attr - 1, \
42f811b8
HX		 2059 .maxlen = sizeof(int), \
2060 .mode = mval, \
2061 .proc_handler = proc, \
31be3085 2062 .extra1 = &ipv4_devconf, \
42f811b8
HX		 2063 }
2064
2065#define DEVINET_SYSCTL_RW_ENTRY(attr, name) \
f8572d8f 2066 DEVINET_SYSCTL_ENTRY(attr, name, 0644, devinet_conf_proc)
42f811b8
HX		 2067
2068#define DEVINET_SYSCTL_RO_ENTRY(attr, name) \
f8572d8f 2069 DEVINET_SYSCTL_ENTRY(attr, name, 0444, devinet_conf_proc)
42f811b8 2070
f8572d8f
EB		 2071#define DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, proc) \
2072 DEVINET_SYSCTL_ENTRY(attr, name, 0644, proc)
42f811b8
HX		 2073
2074#define DEVINET_SYSCTL_FLUSHING_ENTRY(attr, name) \
f8572d8f 2075 DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, ipv4_doint_and_flush)
42f811b8 2076
1da177e4
LT		 2077static struct devinet_sysctl_table {
2078 struct ctl_table_header *sysctl_header;
02291680 2079 struct ctl_table devinet_vars[__IPV4_DEVCONF_MAX];
1da177e4
LT		 2080} devinet_sysctl = {
2081 .devinet_vars = {
42f811b8 2082 DEVINET_SYSCTL_COMPLEX_ENTRY(FORWARDING, "forwarding",
f8572d8f 2083 devinet_sysctl_forward),
42f811b8
HX		 2084 DEVINET_SYSCTL_RO_ENTRY(MC_FORWARDING, "mc_forwarding"),
2085
2086 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_REDIRECTS, "accept_redirects"),
2087 DEVINET_SYSCTL_RW_ENTRY(SECURE_REDIRECTS, "secure_redirects"),
2088 DEVINET_SYSCTL_RW_ENTRY(SHARED_MEDIA, "shared_media"),
2089 DEVINET_SYSCTL_RW_ENTRY(RP_FILTER, "rp_filter"),
2090 DEVINET_SYSCTL_RW_ENTRY(SEND_REDIRECTS, "send_redirects"),
2091 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_SOURCE_ROUTE,
2092 "accept_source_route"),
8153a10c 2093 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_LOCAL, "accept_local"),
28f6aeea 2094 DEVINET_SYSCTL_RW_ENTRY(SRC_VMARK, "src_valid_mark"),
42f811b8
HX		 2095 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP, "proxy_arp"),
2096 DEVINET_SYSCTL_RW_ENTRY(MEDIUM_ID, "medium_id"),
2097 DEVINET_SYSCTL_RW_ENTRY(BOOTP_RELAY, "bootp_relay"),
2098 DEVINET_SYSCTL_RW_ENTRY(LOG_MARTIANS, "log_martians"),
2099 DEVINET_SYSCTL_RW_ENTRY(TAG, "tag"),
2100 DEVINET_SYSCTL_RW_ENTRY(ARPFILTER, "arp_filter"),
2101 DEVINET_SYSCTL_RW_ENTRY(ARP_ANNOUNCE, "arp_announce"),
2102 DEVINET_SYSCTL_RW_ENTRY(ARP_IGNORE, "arp_ignore"),
2103 DEVINET_SYSCTL_RW_ENTRY(ARP_ACCEPT, "arp_accept"),
eefef1cf 2104 DEVINET_SYSCTL_RW_ENTRY(ARP_NOTIFY, "arp_notify"),
65324144 2105 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP_PVLAN, "proxy_arp_pvlan"),
42f811b8
HX		 2106
2107 DEVINET_SYSCTL_FLUSHING_ENTRY(NOXFRM, "disable_xfrm"),
2108 DEVINET_SYSCTL_FLUSHING_ENTRY(NOPOLICY, "disable_policy"),
2109 DEVINET_SYSCTL_FLUSHING_ENTRY(FORCE_IGMP_VERSION,
2110 "force_igmp_version"),
2111 DEVINET_SYSCTL_FLUSHING_ENTRY(PROMOTE_SECONDARIES,
2112 "promote_secondaries"),
d0daebc3
TG		 2113 DEVINET_SYSCTL_FLUSHING_ENTRY(ROUTE_LOCALNET,
2114 "route_localnet"),
1da177e4 2115 },
1da177e4
LT		 2116};
2117
ea40b324 2118static int __devinet_sysctl_register(struct net *net, char *dev_name,
f8572d8f 2119 struct ipv4_devconf *p)
1da177e4
LT		 2120{
2121 int i;
9fa89642 2122 struct devinet_sysctl_table *t;
8607ddb8 2123 char path[sizeof("net/ipv4/conf/") + IFNAMSIZ];
bfada697 2124
9fa89642 2125 t = kmemdup(&devinet_sysctl, sizeof(*t), GFP_KERNEL);
1da177e4 2126 if (!t)
9fa89642
PE		 2127 goto out;
2128
1da177e4
LT		 2129 for (i = 0; i < ARRAY_SIZE(t->devinet_vars) - 1; i++) {
2130 t->devinet_vars[i].data += (char *)p - (char *)&ipv4_devconf;
31be3085 2131 t->devinet_vars[i].extra1 = p;
c0ce9fb3 2132 t->devinet_vars[i].extra2 = net;
1da177e4
LT		 2133 }
2134
8607ddb8 2135 snprintf(path, sizeof(path), "net/ipv4/conf/%s", dev_name);
1da177e4 2136
8607ddb8 2137 t->sysctl_header = register_net_sysctl(net, path, t->devinet_vars);
1da177e4 2138 if (!t->sysctl_header)
8607ddb8 2139 goto free;
1da177e4
LT		 2140
2141 p->sysctl = t;
ea40b324 2142 return 0;
1da177e4 2143
9fa89642 2144free:
1da177e4 2145 kfree(t);
9fa89642 2146out:
ea40b324 2147 return -ENOBUFS;
1da177e4
LT		 2148}
2149
51602b2a
PE		 2150static void __devinet_sysctl_unregister(struct ipv4_devconf *cnf)
2151{
2152 struct devinet_sysctl_table *t = cnf->sysctl;
2153
2154 if (t == NULL)
2155 return;
2156
2157 cnf->sysctl = NULL;
ff538818 2158 unregister_net_sysctl_table(t->sysctl_header);
51602b2a
PE		 2159 kfree(t);
2160}
2161
66f27a52
PE		 2162static void devinet_sysctl_register(struct in_device *idev)
2163{
54716e3b 2164 neigh_sysctl_register(idev->dev, idev->arp_parms, "ipv4", NULL);
c346dca1 2165 __devinet_sysctl_register(dev_net(idev->dev), idev->dev->name,
f8572d8f 2166 &idev->cnf);
66f27a52
PE		 2167}
2168
51602b2a 2169static void devinet_sysctl_unregister(struct in_device *idev)
1da177e4 2170{
51602b2a
PE		 2171 __devinet_sysctl_unregister(&idev->cnf);
2172 neigh_sysctl_unregister(idev->arp_parms);
1da177e4 2173}
1da177e4 2174
68dd299b
PE		 2175static struct ctl_table ctl_forward_entry[] = {
2176 {
68dd299b
PE		 2177 .procname = "ip_forward",
2178 .data = &ipv4_devconf.data[
02291680 2179 IPV4_DEVCONF_FORWARDING - 1],
68dd299b
PE		 2180 .maxlen = sizeof(int),
2181 .mode = 0644,
2182 .proc_handler = devinet_sysctl_forward,
68dd299b 2183 .extra1 = &ipv4_devconf,
c0ce9fb3 2184 .extra2 = &init_net,
68dd299b
PE		 2185 },
2186 { },
2187};
2a75de0c 2188#endif
68dd299b 2189
752d14dc
PE		 2190static __net_init int devinet_init_net(struct net *net)
2191{
2192 int err;
752d14dc 2193 struct ipv4_devconf *all, *dflt;
2a75de0c
ED		 2194#ifdef CONFIG_SYSCTL
2195 struct ctl_table *tbl = ctl_forward_entry;
752d14dc 2196 struct ctl_table_header *forw_hdr;
2a75de0c 2197#endif
752d14dc
PE		 2198
2199 err = -ENOMEM;
2200 all = &ipv4_devconf;
2201 dflt = &ipv4_devconf_dflt;
752d14dc 2202
09ad9bc7 2203 if (!net_eq(net, &init_net)) {
752d14dc
PE		 2204 all = kmemdup(all, sizeof(ipv4_devconf), GFP_KERNEL);
2205 if (all == NULL)
2206 goto err_alloc_all;
2207
2208 dflt = kmemdup(dflt, sizeof(ipv4_devconf_dflt), GFP_KERNEL);
2209 if (dflt == NULL)
2210 goto err_alloc_dflt;
2211
2a75de0c 2212#ifdef CONFIG_SYSCTL
752d14dc
PE		 2213 tbl = kmemdup(tbl, sizeof(ctl_forward_entry), GFP_KERNEL);
2214 if (tbl == NULL)
2215 goto err_alloc_ctl;
2216
02291680 2217 tbl[0].data = &all->data[IPV4_DEVCONF_FORWARDING - 1];
752d14dc
PE		 2218 tbl[0].extra1 = all;
2219 tbl[0].extra2 = net;
2a75de0c 2220#endif
752d14dc
PE		 2221 }
2222
2223#ifdef CONFIG_SYSCTL
f8572d8f 2224 err = __devinet_sysctl_register(net, "all", all);
752d14dc
PE		 2225 if (err < 0)
2226 goto err_reg_all;
2227
f8572d8f 2228 err = __devinet_sysctl_register(net, "default", dflt);
752d14dc
PE		 2229 if (err < 0)
2230 goto err_reg_dflt;
2231
2232 err = -ENOMEM;
8607ddb8 2233 forw_hdr = register_net_sysctl(net, "net/ipv4", tbl);
752d14dc
PE		 2234 if (forw_hdr == NULL)
2235 goto err_reg_ctl;
2a75de0c 2236 net->ipv4.forw_hdr = forw_hdr;
752d14dc
PE		 2237#endif
2238
752d14dc
PE		 2239 net->ipv4.devconf_all = all;
2240 net->ipv4.devconf_dflt = dflt;
2241 return 0;
2242
2243#ifdef CONFIG_SYSCTL
2244err_reg_ctl:
2245 __devinet_sysctl_unregister(dflt);
2246err_reg_dflt:
2247 __devinet_sysctl_unregister(all);
2248err_reg_all:
2249 if (tbl != ctl_forward_entry)
2250 kfree(tbl);
752d14dc 2251err_alloc_ctl:
2a75de0c 2252#endif
752d14dc
PE		 2253 if (dflt != &ipv4_devconf_dflt)
2254 kfree(dflt);
2255err_alloc_dflt:
2256 if (all != &ipv4_devconf)
2257 kfree(all);
2258err_alloc_all:
2259 return err;
2260}
2261
2262static __net_exit void devinet_exit_net(struct net *net)
2263{
2a75de0c 2264#ifdef CONFIG_SYSCTL
752d14dc
PE		 2265 struct ctl_table *tbl;
2266
2267 tbl = net->ipv4.forw_hdr->ctl_table_arg;
752d14dc
PE		 2268 unregister_net_sysctl_table(net->ipv4.forw_hdr);
2269 __devinet_sysctl_unregister(net->ipv4.devconf_dflt);
2270 __devinet_sysctl_unregister(net->ipv4.devconf_all);
752d14dc 2271 kfree(tbl);
2a75de0c 2272#endif
752d14dc
PE		 2273 kfree(net->ipv4.devconf_dflt);
2274 kfree(net->ipv4.devconf_all);
2275}
2276
2277static __net_initdata struct pernet_operations devinet_ops = {
2278 .init = devinet_init_net,
2279 .exit = devinet_exit_net,
2280};
2281
9f0f7272
TG		 2282static struct rtnl_af_ops inet_af_ops = {
2283 .family = AF_INET,
2284 .fill_link_af = inet_fill_link_af,
2285 .get_link_af_size = inet_get_link_af_size,
cf7afbfe
TG		 2286 .validate_link_af = inet_validate_link_af,
2287 .set_link_af = inet_set_link_af,
9f0f7272
TG		 2288};
2289
1da177e4
LT		 2290void __init devinet_init(void)
2291{
fd23c3b3
DM		 2292 int i;
2293
2294 for (i = 0; i < IN4_ADDR_HSIZE; i++)
2295 INIT_HLIST_HEAD(&inet_addr_lst[i]);
2296
752d14dc
PE		 2297 register_pernet_subsys(&devinet_ops);
2298
1da177e4
LT		 2299 register_gifconf(PF_INET, inet_gifconf);
2300 register_netdevice_notifier(&ip_netdev_notifier);
63f3444f 2301
5c766d64
JP		 2302 schedule_delayed_work(&check_lifetime_work, 0);
2303
9f0f7272
TG		 2304 rtnl_af_register(&inet_af_ops);
2305
c7ac8679
GR		 2306 rtnl_register(PF_INET, RTM_NEWADDR, inet_rtm_newaddr, NULL, NULL);
2307 rtnl_register(PF_INET, RTM_DELADDR, inet_rtm_deladdr, NULL, NULL);
2308 rtnl_register(PF_INET, RTM_GETADDR, NULL, inet_dump_ifaddr, NULL);
9e551110 2309 rtnl_register(PF_INET, RTM_GETNETCONF, inet_netconf_get_devconf,
7a674200 2310 inet_netconf_dump_devconf, NULL);
1da177e4
LT		 2311}
2312
kernel source for telekom puls (alcatel/mediatek)