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net: Don't export sysctls to unprivileged users
[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
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>
1da177e4 66
406b6f97
DM		 67#include "fib_lookup.h"
68
0027ba84 69static struct ipv4_devconf ipv4_devconf = {
42f811b8 70 .data = {
02291680
EB		 71 [IPV4_DEVCONF_ACCEPT_REDIRECTS - 1] = 1,
72 [IPV4_DEVCONF_SEND_REDIRECTS - 1] = 1,
73 [IPV4_DEVCONF_SECURE_REDIRECTS - 1] = 1,
74 [IPV4_DEVCONF_SHARED_MEDIA - 1] = 1,
42f811b8 75 },
1da177e4
LT		 76};
77
78static struct ipv4_devconf ipv4_devconf_dflt = {
42f811b8 79 .data = {
02291680
EB		 80 [IPV4_DEVCONF_ACCEPT_REDIRECTS - 1] = 1,
81 [IPV4_DEVCONF_SEND_REDIRECTS - 1] = 1,
82 [IPV4_DEVCONF_SECURE_REDIRECTS - 1] = 1,
83 [IPV4_DEVCONF_SHARED_MEDIA - 1] = 1,
84 [IPV4_DEVCONF_ACCEPT_SOURCE_ROUTE - 1] = 1,
42f811b8 85 },
1da177e4
LT		 86};
87
9355bbd6
PE		 88#define IPV4_DEVCONF_DFLT(net, attr) \
89 IPV4_DEVCONF((*net->ipv4.devconf_dflt), attr)
42f811b8 90
ef7c79ed 91static const struct nla_policy ifa_ipv4_policy[IFA_MAX+1] = {
5c753978
TG		 92 [IFA_LOCAL] = { .type = NLA_U32 },
93 [IFA_ADDRESS] = { .type = NLA_U32 },
94 [IFA_BROADCAST] = { .type = NLA_U32 },
5176f91e 95 [IFA_LABEL] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 },
5c753978
TG		 96};
97
40384999
ED		 98#define IN4_ADDR_HSIZE_SHIFT 8
99#define IN4_ADDR_HSIZE (1U << IN4_ADDR_HSIZE_SHIFT)
100
fd23c3b3
DM		 101static struct hlist_head inet_addr_lst[IN4_ADDR_HSIZE];
102static DEFINE_SPINLOCK(inet_addr_hash_lock);
103
40384999 104static u32 inet_addr_hash(struct net *net, __be32 addr)
fd23c3b3 105{
40384999 106 u32 val = (__force u32) addr ^ net_hash_mix(net);
fd23c3b3 107
40384999 108 return hash_32(val, IN4_ADDR_HSIZE_SHIFT);
fd23c3b3
DM		 109}
110
111static void inet_hash_insert(struct net *net, struct in_ifaddr *ifa)
112{
40384999 113 u32 hash = inet_addr_hash(net, ifa->ifa_local);
fd23c3b3
DM		 114
115 spin_lock(&inet_addr_hash_lock);
116 hlist_add_head_rcu(&ifa->hash, &inet_addr_lst[hash]);
117 spin_unlock(&inet_addr_hash_lock);
118}
119
120static void inet_hash_remove(struct in_ifaddr *ifa)
121{
122 spin_lock(&inet_addr_hash_lock);
123 hlist_del_init_rcu(&ifa->hash);
124 spin_unlock(&inet_addr_hash_lock);
125}
126
9435eb1c
DM		 127/**
128 * __ip_dev_find - find the first device with a given source address.
129 * @net: the net namespace
130 * @addr: the source address
131 * @devref: if true, take a reference on the found device
132 *
133 * If a caller uses devref=false, it should be protected by RCU, or RTNL
134 */
135struct net_device *__ip_dev_find(struct net *net, __be32 addr, bool devref)
136{
40384999 137 u32 hash = inet_addr_hash(net, addr);
9435eb1c
DM		 138 struct net_device *result = NULL;
139 struct in_ifaddr *ifa;
140 struct hlist_node *node;
141
142 rcu_read_lock();
143 hlist_for_each_entry_rcu(ifa, node, &inet_addr_lst[hash], hash) {
e066008b 144 if (ifa->ifa_local == addr) {
40384999
ED		 145 struct net_device *dev = ifa->ifa_dev->dev;
146
147 if (!net_eq(dev_net(dev), net))
148 continue;
9435eb1c
DM		 149 result = dev;
150 break;
151 }
152 }
406b6f97
DM		 153 if (!result) {
154 struct flowi4 fl4 = { .daddr = addr };
155 struct fib_result res = { 0 };
156 struct fib_table *local;
157
158 /* Fallback to FIB local table so that communication
159 * over loopback subnets work.
160 */
161 local = fib_get_table(net, RT_TABLE_LOCAL);
162 if (local &&
163 !fib_table_lookup(local, &fl4, &res, FIB_LOOKUP_NOREF) &&
164 res.type == RTN_LOCAL)
165 result = FIB_RES_DEV(res);
166 }
9435eb1c
DM		 167 if (result && devref)
168 dev_hold(result);
169 rcu_read_unlock();
170 return result;
171}
172EXPORT_SYMBOL(__ip_dev_find);
173
d6062cbb 174static void rtmsg_ifa(int event, struct in_ifaddr *, struct nlmsghdr *, u32);
1da177e4 175
e041c683 176static BLOCKING_NOTIFIER_HEAD(inetaddr_chain);
1da177e4
LT		 177static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
178 int destroy);
179#ifdef CONFIG_SYSCTL
66f27a52 180static void devinet_sysctl_register(struct in_device *idev);
51602b2a
PE		 181static void devinet_sysctl_unregister(struct in_device *idev);
182#else
40384999 183static void devinet_sysctl_register(struct in_device *idev)
51602b2a
PE		 184{
185}
40384999 186static void devinet_sysctl_unregister(struct in_device *idev)
51602b2a
PE		 187{
188}
1da177e4
LT		 189#endif
190
191/* Locks all the inet devices. */
192
193static struct in_ifaddr *inet_alloc_ifa(void)
194{
93adcc80 195 return kzalloc(sizeof(struct in_ifaddr), GFP_KERNEL);
1da177e4
LT		 196}
197
198static void inet_rcu_free_ifa(struct rcu_head *head)
199{
200 struct in_ifaddr *ifa = container_of(head, struct in_ifaddr, rcu_head);
201 if (ifa->ifa_dev)
202 in_dev_put(ifa->ifa_dev);
203 kfree(ifa);
204}
205
40384999 206static void inet_free_ifa(struct in_ifaddr *ifa)
1da177e4
LT		 207{
208 call_rcu(&ifa->rcu_head, inet_rcu_free_ifa);
209}
210
211void in_dev_finish_destroy(struct in_device *idev)
212{
213 struct net_device *dev = idev->dev;
214
547b792c
IJ		 215 WARN_ON(idev->ifa_list);
216 WARN_ON(idev->mc_list);
1da177e4 217#ifdef NET_REFCNT_DEBUG
91df42be 218 pr_debug("%s: %p=%s\n", __func__, idev, dev ? dev->name : "NIL");
1da177e4
LT		 219#endif
220 dev_put(dev);
221 if (!idev->dead)
9f9354b9
ED		 222 pr_err("Freeing alive in_device %p\n", idev);
223 else
1da177e4 224 kfree(idev);
1da177e4 225}
9f9354b9 226EXPORT_SYMBOL(in_dev_finish_destroy);
1da177e4 227
71e27da9 228static struct in_device *inetdev_init(struct net_device *dev)
1da177e4
LT		 229{
230 struct in_device *in_dev;
231
232 ASSERT_RTNL();
233
0da974f4 234 in_dev = kzalloc(sizeof(*in_dev), GFP_KERNEL);
1da177e4
LT		 235 if (!in_dev)
236 goto out;
c346dca1 237 memcpy(&in_dev->cnf, dev_net(dev)->ipv4.devconf_dflt,
9355bbd6 238 sizeof(in_dev->cnf));
1da177e4
LT		 239 in_dev->cnf.sysctl = NULL;
240 in_dev->dev = dev;
9f9354b9
ED		 241 in_dev->arp_parms = neigh_parms_alloc(dev, &arp_tbl);
242 if (!in_dev->arp_parms)
1da177e4 243 goto out_kfree;
0187bdfb
BH		 244 if (IPV4_DEVCONF(in_dev->cnf, FORWARDING))
245 dev_disable_lro(dev);
1da177e4
LT		 246 /* Reference in_dev->dev */
247 dev_hold(dev);
30c4cf57 248 /* Account for reference dev->ip_ptr (below) */
1da177e4 249 in_dev_hold(in_dev);
1da177e4 250
66f27a52 251 devinet_sysctl_register(in_dev);
1da177e4
LT		 252 ip_mc_init_dev(in_dev);
253 if (dev->flags & IFF_UP)
254 ip_mc_up(in_dev);
483479ec 255
30c4cf57 256 /* we can receive as soon as ip_ptr is set -- do this last */
cf778b00 257 rcu_assign_pointer(dev->ip_ptr, in_dev);
483479ec 258out:
1da177e4
LT		 259 return in_dev;
260out_kfree:
261 kfree(in_dev);
262 in_dev = NULL;
263 goto out;
264}
265
266static void in_dev_rcu_put(struct rcu_head *head)
267{
268 struct in_device *idev = container_of(head, struct in_device, rcu_head);
269 in_dev_put(idev);
270}
271
272static void inetdev_destroy(struct in_device *in_dev)
273{
274 struct in_ifaddr *ifa;
275 struct net_device *dev;
276
277 ASSERT_RTNL();
278
279 dev = in_dev->dev;
1da177e4
LT		 280
281 in_dev->dead = 1;
282
283 ip_mc_destroy_dev(in_dev);
284
285 while ((ifa = in_dev->ifa_list) != NULL) {
286 inet_del_ifa(in_dev, &in_dev->ifa_list, 0);
287 inet_free_ifa(ifa);
288 }
289
a9b3cd7f 290 RCU_INIT_POINTER(dev->ip_ptr, NULL);
1da177e4 291
51602b2a 292 devinet_sysctl_unregister(in_dev);
1da177e4
LT		 293 neigh_parms_release(&arp_tbl, in_dev->arp_parms);
294 arp_ifdown(dev);
295
296 call_rcu(&in_dev->rcu_head, in_dev_rcu_put);
297}
298
ff428d72 299int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b)
1da177e4
LT		 300{
301 rcu_read_lock();
302 for_primary_ifa(in_dev) {
303 if (inet_ifa_match(a, ifa)) {
304 if (!b || inet_ifa_match(b, ifa)) {
305 rcu_read_unlock();
306 return 1;
307 }
308 }
309 } endfor_ifa(in_dev);
310 rcu_read_unlock();
311 return 0;
312}
313
d6062cbb 314static void __inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
15e47304 315 int destroy, struct nlmsghdr *nlh, u32 portid)
1da177e4 316{
8f937c60 317 struct in_ifaddr *promote = NULL;
0ff60a45
JHS		 318 struct in_ifaddr *ifa, *ifa1 = *ifap;
319 struct in_ifaddr *last_prim = in_dev->ifa_list;
320 struct in_ifaddr *prev_prom = NULL;
321 int do_promote = IN_DEV_PROMOTE_SECONDARIES(in_dev);
1da177e4
LT		 322
323 ASSERT_RTNL();
324
e905a9ed 325 /* 1. Deleting primary ifaddr forces deletion all secondaries
8f937c60
HW		 326 * unless alias promotion is set
327 **/
1da177e4
LT		 328
329 if (!(ifa1->ifa_flags & IFA_F_SECONDARY)) {
1da177e4
LT		 330 struct in_ifaddr **ifap1 = &ifa1->ifa_next;
331
332 while ((ifa = *ifap1) != NULL) {
e905a9ed 333 if (!(ifa->ifa_flags & IFA_F_SECONDARY) &&
0ff60a45
JHS		 334 ifa1->ifa_scope <= ifa->ifa_scope)
335 last_prim = ifa;
336
1da177e4
LT		 337 if (!(ifa->ifa_flags & IFA_F_SECONDARY) ||
338 ifa1->ifa_mask != ifa->ifa_mask ||
339 !inet_ifa_match(ifa1->ifa_address, ifa)) {
340 ifap1 = &ifa->ifa_next;
0ff60a45 341 prev_prom = ifa;
1da177e4
LT		 342 continue;
343 }
344
0ff60a45 345 if (!do_promote) {
fd23c3b3 346 inet_hash_remove(ifa);
8f937c60 347 *ifap1 = ifa->ifa_next;
1da177e4 348
15e47304 349 rtmsg_ifa(RTM_DELADDR, ifa, nlh, portid);
e041c683
AS		 350 blocking_notifier_call_chain(&inetaddr_chain,
351 NETDEV_DOWN, ifa);
8f937c60
HW		 352 inet_free_ifa(ifa);
353 } else {
354 promote = ifa;
355 break;
356 }
1da177e4
LT		 357 }
358 }
359
2d230e2b
JA		 360 /* On promotion all secondaries from subnet are changing
361 * the primary IP, we must remove all their routes silently
362 * and later to add them back with new prefsrc. Do this
363 * while all addresses are on the device list.
364 */
365 for (ifa = promote; ifa; ifa = ifa->ifa_next) {
366 if (ifa1->ifa_mask == ifa->ifa_mask &&
367 inet_ifa_match(ifa1->ifa_address, ifa))
368 fib_del_ifaddr(ifa, ifa1);
369 }
370
1da177e4
LT		 371 /* 2. Unlink it */
372
373 *ifap = ifa1->ifa_next;
fd23c3b3 374 inet_hash_remove(ifa1);
1da177e4
LT		 375
376 /* 3. Announce address deletion */
377
378 /* Send message first, then call notifier.
379 At first sight, FIB update triggered by notifier
380 will refer to already deleted ifaddr, that could confuse
381 netlink listeners. It is not true: look, gated sees
382 that route deleted and if it still thinks that ifaddr
383 is valid, it will try to restore deleted routes... Grr.
384 So that, this order is correct.
385 */
15e47304 386 rtmsg_ifa(RTM_DELADDR, ifa1, nlh, portid);
e041c683 387 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa1);
1da177e4 388
0ff60a45 389 if (promote) {
04024b93 390 struct in_ifaddr *next_sec = promote->ifa_next;
0ff60a45
JHS		 391
392 if (prev_prom) {
393 prev_prom->ifa_next = promote->ifa_next;
394 promote->ifa_next = last_prim->ifa_next;
395 last_prim->ifa_next = promote;
396 }
8f937c60 397
8f937c60 398 promote->ifa_flags &= ~IFA_F_SECONDARY;
15e47304 399 rtmsg_ifa(RTM_NEWADDR, promote, nlh, portid);
e041c683
AS		 400 blocking_notifier_call_chain(&inetaddr_chain,
401 NETDEV_UP, promote);
04024b93 402 for (ifa = next_sec; ifa; ifa = ifa->ifa_next) {
0ff60a45
JHS		 403 if (ifa1->ifa_mask != ifa->ifa_mask ||
404 !inet_ifa_match(ifa1->ifa_address, ifa))
405 continue;
406 fib_add_ifaddr(ifa);
407 }
408
409 }
6363097c 410 if (destroy)
0ff60a45 411 inet_free_ifa(ifa1);
1da177e4
LT		 412}
413
d6062cbb
TG		 414static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
415 int destroy)
416{
417 __inet_del_ifa(in_dev, ifap, destroy, NULL, 0);
418}
419
420static int __inet_insert_ifa(struct in_ifaddr *ifa, struct nlmsghdr *nlh,
15e47304 421 u32 portid)
1da177e4
LT		 422{
423 struct in_device *in_dev = ifa->ifa_dev;
424 struct in_ifaddr *ifa1, **ifap, **last_primary;
425
426 ASSERT_RTNL();
427
428 if (!ifa->ifa_local) {
429 inet_free_ifa(ifa);
430 return 0;
431 }
432
433 ifa->ifa_flags &= ~IFA_F_SECONDARY;
434 last_primary = &in_dev->ifa_list;
435
436 for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL;
437 ifap = &ifa1->ifa_next) {
438 if (!(ifa1->ifa_flags & IFA_F_SECONDARY) &&
439 ifa->ifa_scope <= ifa1->ifa_scope)
440 last_primary = &ifa1->ifa_next;
441 if (ifa1->ifa_mask == ifa->ifa_mask &&
442 inet_ifa_match(ifa1->ifa_address, ifa)) {
443 if (ifa1->ifa_local == ifa->ifa_local) {
444 inet_free_ifa(ifa);
445 return -EEXIST;
446 }
447 if (ifa1->ifa_scope != ifa->ifa_scope) {
448 inet_free_ifa(ifa);
449 return -EINVAL;
450 }
451 ifa->ifa_flags |= IFA_F_SECONDARY;
452 }
453 }
454
455 if (!(ifa->ifa_flags & IFA_F_SECONDARY)) {
456 net_srandom(ifa->ifa_local);
457 ifap = last_primary;
458 }
459
460 ifa->ifa_next = *ifap;
461 *ifap = ifa;
462
fd23c3b3
DM		 463 inet_hash_insert(dev_net(in_dev->dev), ifa);
464
1da177e4
LT		 465 /* Send message first, then call notifier.
466 Notifier will trigger FIB update, so that
467 listeners of netlink will know about new ifaddr */
15e47304 468 rtmsg_ifa(RTM_NEWADDR, ifa, nlh, portid);
e041c683 469 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa);
1da177e4
LT		 470
471 return 0;
472}
473
d6062cbb
TG		 474static int inet_insert_ifa(struct in_ifaddr *ifa)
475{
476 return __inet_insert_ifa(ifa, NULL, 0);
477}
478
1da177e4
LT		 479static int inet_set_ifa(struct net_device *dev, struct in_ifaddr *ifa)
480{
e5ed6399 481 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1da177e4
LT		 482
483 ASSERT_RTNL();
484
485 if (!in_dev) {
71e27da9
HX		 486 inet_free_ifa(ifa);
487 return -ENOBUFS;
1da177e4 488 }
71e27da9 489 ipv4_devconf_setall(in_dev);
1da177e4 490 if (ifa->ifa_dev != in_dev) {
547b792c 491 WARN_ON(ifa->ifa_dev);
1da177e4
LT		 492 in_dev_hold(in_dev);
493 ifa->ifa_dev = in_dev;
494 }
f97c1e0c 495 if (ipv4_is_loopback(ifa->ifa_local))
1da177e4
LT		 496 ifa->ifa_scope = RT_SCOPE_HOST;
497 return inet_insert_ifa(ifa);
498}
499
8723e1b4
ED		 500/* Caller must hold RCU or RTNL :
501 * We dont take a reference on found in_device
502 */
7fee0ca2 503struct in_device *inetdev_by_index(struct net *net, int ifindex)
1da177e4
LT		 504{
505 struct net_device *dev;
506 struct in_device *in_dev = NULL;
c148fc2e
ED		 507
508 rcu_read_lock();
509 dev = dev_get_by_index_rcu(net, ifindex);
1da177e4 510 if (dev)
8723e1b4 511 in_dev = rcu_dereference_rtnl(dev->ip_ptr);
c148fc2e 512 rcu_read_unlock();
1da177e4
LT		 513 return in_dev;
514}
9f9354b9 515EXPORT_SYMBOL(inetdev_by_index);
1da177e4
LT		 516
517/* Called only from RTNL semaphored context. No locks. */
518
60cad5da
AV		 519struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix,
520 __be32 mask)
1da177e4
LT		 521{
522 ASSERT_RTNL();
523
524 for_primary_ifa(in_dev) {
525 if (ifa->ifa_mask == mask && inet_ifa_match(prefix, ifa))
526 return ifa;
527 } endfor_ifa(in_dev);
528 return NULL;
529}
530
531static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
532{
3b1e0a65 533 struct net *net = sock_net(skb->sk);
dfdd5fd4 534 struct nlattr *tb[IFA_MAX+1];
1da177e4 535 struct in_device *in_dev;
dfdd5fd4 536 struct ifaddrmsg *ifm;
1da177e4 537 struct in_ifaddr *ifa, **ifap;
dfdd5fd4 538 int err = -EINVAL;
1da177e4
LT		 539
540 ASSERT_RTNL();
541
dfdd5fd4
TG		 542 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy);
543 if (err < 0)
544 goto errout;
545
546 ifm = nlmsg_data(nlh);
7fee0ca2 547 in_dev = inetdev_by_index(net, ifm->ifa_index);
dfdd5fd4
TG		 548 if (in_dev == NULL) {
549 err = -ENODEV;
550 goto errout;
551 }
552
1da177e4
LT		 553 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
554 ifap = &ifa->ifa_next) {
dfdd5fd4 555 if (tb[IFA_LOCAL] &&
a7a628c4 556 ifa->ifa_local != nla_get_be32(tb[IFA_LOCAL]))
dfdd5fd4
TG		 557 continue;
558
559 if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label))
1da177e4 560 continue;
dfdd5fd4
TG		 561
562 if (tb[IFA_ADDRESS] &&
563 (ifm->ifa_prefixlen != ifa->ifa_prefixlen ||
a7a628c4 564 !inet_ifa_match(nla_get_be32(tb[IFA_ADDRESS]), ifa)))
dfdd5fd4
TG		 565 continue;
566
15e47304 567 __inet_del_ifa(in_dev, ifap, 1, nlh, NETLINK_CB(skb).portid);
1da177e4
LT		 568 return 0;
569 }
dfdd5fd4
TG		 570
571 err = -EADDRNOTAVAIL;
572errout:
573 return err;
1da177e4
LT		 574}
575
4b8aa9ab 576static struct in_ifaddr *rtm_to_ifaddr(struct net *net, struct nlmsghdr *nlh)
1da177e4 577{
5c753978
TG		 578 struct nlattr *tb[IFA_MAX+1];
579 struct in_ifaddr *ifa;
580 struct ifaddrmsg *ifm;
1da177e4
LT		 581 struct net_device *dev;
582 struct in_device *in_dev;
7b218574 583 int err;
1da177e4 584
5c753978
TG		 585 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy);
586 if (err < 0)
587 goto errout;
1da177e4 588
5c753978 589 ifm = nlmsg_data(nlh);
7b218574
DL		 590 err = -EINVAL;
591 if (ifm->ifa_prefixlen > 32 || tb[IFA_LOCAL] == NULL)
5c753978 592 goto errout;
1da177e4 593
4b8aa9ab 594 dev = __dev_get_by_index(net, ifm->ifa_index);
7b218574
DL		 595 err = -ENODEV;
596 if (dev == NULL)
5c753978 597 goto errout;
1da177e4 598
5c753978 599 in_dev = __in_dev_get_rtnl(dev);
7b218574
DL		 600 err = -ENOBUFS;
601 if (in_dev == NULL)
71e27da9 602 goto errout;
1da177e4 603
5c753978 604 ifa = inet_alloc_ifa();
7b218574 605 if (ifa == NULL)
5c753978
TG		 606 /*
607 * A potential indev allocation can be left alive, it stays
608 * assigned to its device and is destroy with it.
609 */
5c753978 610 goto errout;
5c753978 611
a4e65d36 612 ipv4_devconf_setall(in_dev);
5c753978
TG		 613 in_dev_hold(in_dev);
614
615 if (tb[IFA_ADDRESS] == NULL)
616 tb[IFA_ADDRESS] = tb[IFA_LOCAL];
1da177e4 617
fd23c3b3 618 INIT_HLIST_NODE(&ifa->hash);
1da177e4
LT		 619 ifa->ifa_prefixlen = ifm->ifa_prefixlen;
620 ifa->ifa_mask = inet_make_mask(ifm->ifa_prefixlen);
1da177e4
LT		 621 ifa->ifa_flags = ifm->ifa_flags;
622 ifa->ifa_scope = ifm->ifa_scope;
5c753978
TG		 623 ifa->ifa_dev = in_dev;
624
a7a628c4
AV		 625 ifa->ifa_local = nla_get_be32(tb[IFA_LOCAL]);
626 ifa->ifa_address = nla_get_be32(tb[IFA_ADDRESS]);
5c753978
TG		 627
628 if (tb[IFA_BROADCAST])
a7a628c4 629 ifa->ifa_broadcast = nla_get_be32(tb[IFA_BROADCAST]);
5c753978 630
5c753978
TG		 631 if (tb[IFA_LABEL])
632 nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ);
1da177e4
LT		 633 else
634 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
635
5c753978
TG		 636 return ifa;
637
638errout:
639 return ERR_PTR(err);
640}
641
642static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
643{
3b1e0a65 644 struct net *net = sock_net(skb->sk);
5c753978
TG		 645 struct in_ifaddr *ifa;
646
647 ASSERT_RTNL();
648
4b8aa9ab 649 ifa = rtm_to_ifaddr(net, nlh);
5c753978
TG		 650 if (IS_ERR(ifa))
651 return PTR_ERR(ifa);
652
15e47304 653 return __inet_insert_ifa(ifa, nlh, NETLINK_CB(skb).portid);
1da177e4
LT		 654}
655
656/*
657 * Determine a default network mask, based on the IP address.
658 */
659
40384999 660static int inet_abc_len(__be32 addr)
1da177e4
LT		 661{
662 int rc = -1; /* Something else, probably a multicast. */
663
f97c1e0c 664 if (ipv4_is_zeronet(addr))
e905a9ed 665 rc = 0;
1da177e4 666 else {
714e85be 667 __u32 haddr = ntohl(addr);
1da177e4 668
714e85be 669 if (IN_CLASSA(haddr))
1da177e4 670 rc = 8;
714e85be 671 else if (IN_CLASSB(haddr))
1da177e4 672 rc = 16;
714e85be 673 else if (IN_CLASSC(haddr))
1da177e4
LT		 674 rc = 24;
675 }
676
e905a9ed 677 return rc;
1da177e4
LT		 678}
679
680
e5b13cb1 681int devinet_ioctl(struct net *net, unsigned int cmd, void __user *arg)
1da177e4
LT		 682{
683 struct ifreq ifr;
684 struct sockaddr_in sin_orig;
685 struct sockaddr_in *sin = (struct sockaddr_in *)&ifr.ifr_addr;
686 struct in_device *in_dev;
687 struct in_ifaddr **ifap = NULL;
688 struct in_ifaddr *ifa = NULL;
689 struct net_device *dev;
690 char *colon;
691 int ret = -EFAULT;
692 int tryaddrmatch = 0;
693
694 /*
695 * Fetch the caller's info block into kernel space
696 */
697
698 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
699 goto out;
700 ifr.ifr_name[IFNAMSIZ - 1] = 0;
701
702 /* save original address for comparison */
703 memcpy(&sin_orig, sin, sizeof(*sin));
704
705 colon = strchr(ifr.ifr_name, ':');
706 if (colon)
707 *colon = 0;
708
e5b13cb1 709 dev_load(net, ifr.ifr_name);
1da177e4 710
132adf54 711 switch (cmd) {
1da177e4
LT		 712 case SIOCGIFADDR: /* Get interface address */
713 case SIOCGIFBRDADDR: /* Get the broadcast address */
714 case SIOCGIFDSTADDR: /* Get the destination address */
715 case SIOCGIFNETMASK: /* Get the netmask for the interface */
716 /* Note that these ioctls will not sleep,
717 so that we do not impose a lock.
718 One day we will be forced to put shlock here (I mean SMP)
719 */
720 tryaddrmatch = (sin_orig.sin_family == AF_INET);
721 memset(sin, 0, sizeof(*sin));
722 sin->sin_family = AF_INET;
723 break;
724
725 case SIOCSIFFLAGS:
bf5b30b8 726 ret = -EPERM;
1da177e4
LT		 727 if (!capable(CAP_NET_ADMIN))
728 goto out;
729 break;
730 case SIOCSIFADDR: /* Set interface address (and family) */
731 case SIOCSIFBRDADDR: /* Set the broadcast address */
732 case SIOCSIFDSTADDR: /* Set the destination address */
733 case SIOCSIFNETMASK: /* Set the netmask for the interface */
bf5b30b8 734 ret = -EPERM;
1da177e4
LT		 735 if (!capable(CAP_NET_ADMIN))
736 goto out;
737 ret = -EINVAL;
738 if (sin->sin_family != AF_INET)
739 goto out;
740 break;
741 default:
742 ret = -EINVAL;
743 goto out;
744 }
745
746 rtnl_lock();
747
748 ret = -ENODEV;
9f9354b9
ED		 749 dev = __dev_get_by_name(net, ifr.ifr_name);
750 if (!dev)
1da177e4
LT		 751 goto done;
752
753 if (colon)
754 *colon = ':';
755
9f9354b9
ED		 756 in_dev = __in_dev_get_rtnl(dev);
757 if (in_dev) {
1da177e4
LT		 758 if (tryaddrmatch) {
759 /* Matthias Andree */
760 /* compare label and address (4.4BSD style) */
761 /* note: we only do this for a limited set of ioctls
762 and only if the original address family was AF_INET.
763 This is checked above. */
764 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
765 ifap = &ifa->ifa_next) {
766 if (!strcmp(ifr.ifr_name, ifa->ifa_label) &&
767 sin_orig.sin_addr.s_addr ==
6c91afe1 768 ifa->ifa_local) {
1da177e4
LT		 769 break; /* found */
770 }
771 }
772 }
773 /* we didn't get a match, maybe the application is
774 4.3BSD-style and passed in junk so we fall back to
775 comparing just the label */
776 if (!ifa) {
777 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
778 ifap = &ifa->ifa_next)
779 if (!strcmp(ifr.ifr_name, ifa->ifa_label))
780 break;
781 }
782 }
783
784 ret = -EADDRNOTAVAIL;
785 if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS)
786 goto done;
787
132adf54 788 switch (cmd) {
1da177e4
LT		 789 case SIOCGIFADDR: /* Get interface address */
790 sin->sin_addr.s_addr = ifa->ifa_local;
791 goto rarok;
792
793 case SIOCGIFBRDADDR: /* Get the broadcast address */
794 sin->sin_addr.s_addr = ifa->ifa_broadcast;
795 goto rarok;
796
797 case SIOCGIFDSTADDR: /* Get the destination address */
798 sin->sin_addr.s_addr = ifa->ifa_address;
799 goto rarok;
800
801 case SIOCGIFNETMASK: /* Get the netmask for the interface */
802 sin->sin_addr.s_addr = ifa->ifa_mask;
803 goto rarok;
804
805 case SIOCSIFFLAGS:
806 if (colon) {
807 ret = -EADDRNOTAVAIL;
808 if (!ifa)
809 break;
810 ret = 0;
811 if (!(ifr.ifr_flags & IFF_UP))
812 inet_del_ifa(in_dev, ifap, 1);
813 break;
814 }
815 ret = dev_change_flags(dev, ifr.ifr_flags);
816 break;
817
818 case SIOCSIFADDR: /* Set interface address (and family) */
819 ret = -EINVAL;
820 if (inet_abc_len(sin->sin_addr.s_addr) < 0)
821 break;
822
823 if (!ifa) {
824 ret = -ENOBUFS;
9f9354b9 825 ifa = inet_alloc_ifa();
fd23c3b3 826 INIT_HLIST_NODE(&ifa->hash);
9f9354b9 827 if (!ifa)
1da177e4
LT		 828 break;
829 if (colon)
830 memcpy(ifa->ifa_label, ifr.ifr_name, IFNAMSIZ);
831 else
832 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
833 } else {
834 ret = 0;
835 if (ifa->ifa_local == sin->sin_addr.s_addr)
836 break;
837 inet_del_ifa(in_dev, ifap, 0);
838 ifa->ifa_broadcast = 0;
148f9729 839 ifa->ifa_scope = 0;
1da177e4
LT		 840 }
841
842 ifa->ifa_address = ifa->ifa_local = sin->sin_addr.s_addr;
843
844 if (!(dev->flags & IFF_POINTOPOINT)) {
845 ifa->ifa_prefixlen = inet_abc_len(ifa->ifa_address);
846 ifa->ifa_mask = inet_make_mask(ifa->ifa_prefixlen);
847 if ((dev->flags & IFF_BROADCAST) &&
848 ifa->ifa_prefixlen < 31)
849 ifa->ifa_broadcast = ifa->ifa_address |
850 ~ifa->ifa_mask;
851 } else {
852 ifa->ifa_prefixlen = 32;
853 ifa->ifa_mask = inet_make_mask(32);
854 }
855 ret = inet_set_ifa(dev, ifa);
856 break;
857
858 case SIOCSIFBRDADDR: /* Set the broadcast address */
859 ret = 0;
860 if (ifa->ifa_broadcast != sin->sin_addr.s_addr) {
861 inet_del_ifa(in_dev, ifap, 0);
862 ifa->ifa_broadcast = sin->sin_addr.s_addr;
863 inet_insert_ifa(ifa);
864 }
865 break;
866
867 case SIOCSIFDSTADDR: /* Set the destination address */
868 ret = 0;
869 if (ifa->ifa_address == sin->sin_addr.s_addr)
870 break;
871 ret = -EINVAL;
872 if (inet_abc_len(sin->sin_addr.s_addr) < 0)
873 break;
874 ret = 0;
875 inet_del_ifa(in_dev, ifap, 0);
876 ifa->ifa_address = sin->sin_addr.s_addr;
877 inet_insert_ifa(ifa);
878 break;
879
880 case SIOCSIFNETMASK: /* Set the netmask for the interface */
881
882 /*
883 * The mask we set must be legal.
884 */
885 ret = -EINVAL;
886 if (bad_mask(sin->sin_addr.s_addr, 0))
887 break;
888 ret = 0;
889 if (ifa->ifa_mask != sin->sin_addr.s_addr) {
a144ea4b 890 __be32 old_mask = ifa->ifa_mask;
1da177e4
LT		 891 inet_del_ifa(in_dev, ifap, 0);
892 ifa->ifa_mask = sin->sin_addr.s_addr;
893 ifa->ifa_prefixlen = inet_mask_len(ifa->ifa_mask);
894
895 /* See if current broadcast address matches
896 * with current netmask, then recalculate
897 * the broadcast address. Otherwise it's a
898 * funny address, so don't touch it since
899 * the user seems to know what (s)he's doing...
900 */
901 if ((dev->flags & IFF_BROADCAST) &&
902 (ifa->ifa_prefixlen < 31) &&
903 (ifa->ifa_broadcast ==
dcab5e1e 904 (ifa->ifa_local|~old_mask))) {
1da177e4
LT		 905 ifa->ifa_broadcast = (ifa->ifa_local |
906 ~sin->sin_addr.s_addr);
907 }
908 inet_insert_ifa(ifa);
909 }
910 break;
911 }
912done:
913 rtnl_unlock();
914out:
915 return ret;
916rarok:
917 rtnl_unlock();
918 ret = copy_to_user(arg, &ifr, sizeof(struct ifreq)) ? -EFAULT : 0;
919 goto out;
920}
921
922static int inet_gifconf(struct net_device *dev, char __user *buf, int len)
923{
e5ed6399 924 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1da177e4
LT		 925 struct in_ifaddr *ifa;
926 struct ifreq ifr;
927 int done = 0;
928
9f9354b9 929 if (!in_dev)
1da177e4
LT		 930 goto out;
931
9f9354b9 932 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1da177e4
LT		 933 if (!buf) {
934 done += sizeof(ifr);
935 continue;
936 }
937 if (len < (int) sizeof(ifr))
938 break;
939 memset(&ifr, 0, sizeof(struct ifreq));
940 if (ifa->ifa_label)
941 strcpy(ifr.ifr_name, ifa->ifa_label);
942 else
943 strcpy(ifr.ifr_name, dev->name);
944
945 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_family = AF_INET;
946 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_addr.s_addr =
947 ifa->ifa_local;
948
949 if (copy_to_user(buf, &ifr, sizeof(struct ifreq))) {
950 done = -EFAULT;
951 break;
952 }
953 buf += sizeof(struct ifreq);
954 len -= sizeof(struct ifreq);
955 done += sizeof(struct ifreq);
956 }
957out:
958 return done;
959}
960
a61ced5d 961__be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope)
1da177e4 962{
a61ced5d 963 __be32 addr = 0;
1da177e4 964 struct in_device *in_dev;
c346dca1 965 struct net *net = dev_net(dev);
1da177e4
LT		 966
967 rcu_read_lock();
e5ed6399 968 in_dev = __in_dev_get_rcu(dev);
1da177e4
LT		 969 if (!in_dev)
970 goto no_in_dev;
971
972 for_primary_ifa(in_dev) {
973 if (ifa->ifa_scope > scope)
974 continue;
975 if (!dst || inet_ifa_match(dst, ifa)) {
976 addr = ifa->ifa_local;
977 break;
978 }
979 if (!addr)
980 addr = ifa->ifa_local;
981 } endfor_ifa(in_dev);
1da177e4
LT		 982
983 if (addr)
c6d14c84 984 goto out_unlock;
9f9354b9 985no_in_dev:
1da177e4
LT		 986
987 /* Not loopback addresses on loopback should be preferred
988 in this case. It is importnat that lo is the first interface
989 in dev_base list.
990 */
c6d14c84 991 for_each_netdev_rcu(net, dev) {
9f9354b9
ED		 992 in_dev = __in_dev_get_rcu(dev);
993 if (!in_dev)
1da177e4
LT		 994 continue;
995
996 for_primary_ifa(in_dev) {
997 if (ifa->ifa_scope != RT_SCOPE_LINK &&
998 ifa->ifa_scope <= scope) {
999 addr = ifa->ifa_local;
c6d14c84 1000 goto out_unlock;
1da177e4
LT		 1001 }
1002 } endfor_ifa(in_dev);
1003 }
c6d14c84 1004out_unlock:
1da177e4 1005 rcu_read_unlock();
1da177e4
LT		 1006 return addr;
1007}
9f9354b9 1008EXPORT_SYMBOL(inet_select_addr);
1da177e4 1009
60cad5da
AV		 1010static __be32 confirm_addr_indev(struct in_device *in_dev, __be32 dst,
1011 __be32 local, int scope)
1da177e4
LT		 1012{
1013 int same = 0;
a144ea4b 1014 __be32 addr = 0;
1da177e4
LT		 1015
1016 for_ifa(in_dev) {
1017 if (!addr &&
1018 (local == ifa->ifa_local || !local) &&
1019 ifa->ifa_scope <= scope) {
1020 addr = ifa->ifa_local;
1021 if (same)
1022 break;
1023 }
1024 if (!same) {
1025 same = (!local || inet_ifa_match(local, ifa)) &&
1026 (!dst || inet_ifa_match(dst, ifa));
1027 if (same && addr) {
1028 if (local || !dst)
1029 break;
1030 /* Is the selected addr into dst subnet? */
1031 if (inet_ifa_match(addr, ifa))
1032 break;
1033 /* No, then can we use new local src? */
1034 if (ifa->ifa_scope <= scope) {
1035 addr = ifa->ifa_local;
1036 break;
1037 }
1038 /* search for large dst subnet for addr */
1039 same = 0;
1040 }
1041 }
1042 } endfor_ifa(in_dev);
1043
9f9354b9 1044 return same ? addr : 0;
1da177e4
LT		 1045}
1046
1047/*
1048 * Confirm that local IP address exists using wildcards:
9bd85e32 1049 * - in_dev: only on this interface, 0=any interface
1da177e4
LT		 1050 * - dst: only in the same subnet as dst, 0=any dst
1051 * - local: address, 0=autoselect the local address
1052 * - scope: maximum allowed scope value for the local address
1053 */
9bd85e32
DL		 1054__be32 inet_confirm_addr(struct in_device *in_dev,
1055 __be32 dst, __be32 local, int scope)
1da177e4 1056{
60cad5da 1057 __be32 addr = 0;
9bd85e32 1058 struct net_device *dev;
39a6d063 1059 struct net *net;
1da177e4 1060
39a6d063 1061 if (scope != RT_SCOPE_LINK)
9bd85e32 1062 return confirm_addr_indev(in_dev, dst, local, scope);
1da177e4 1063
c346dca1 1064 net = dev_net(in_dev->dev);
1da177e4 1065 rcu_read_lock();
c6d14c84 1066 for_each_netdev_rcu(net, dev) {
9f9354b9
ED		 1067 in_dev = __in_dev_get_rcu(dev);
1068 if (in_dev) {
1da177e4
LT		 1069 addr = confirm_addr_indev(in_dev, dst, local, scope);
1070 if (addr)
1071 break;
1072 }
1073 }
1074 rcu_read_unlock();
1da177e4
LT		 1075
1076 return addr;
1077}
eaddcd76 1078EXPORT_SYMBOL(inet_confirm_addr);
1da177e4
LT		 1079
1080/*
1081 * Device notifier
1082 */
1083
1084int register_inetaddr_notifier(struct notifier_block *nb)
1085{
e041c683 1086 return blocking_notifier_chain_register(&inetaddr_chain, nb);
1da177e4 1087}
9f9354b9 1088EXPORT_SYMBOL(register_inetaddr_notifier);
1da177e4
LT		 1089
1090int unregister_inetaddr_notifier(struct notifier_block *nb)
1091{
e041c683 1092 return blocking_notifier_chain_unregister(&inetaddr_chain, nb);
1da177e4 1093}
9f9354b9 1094EXPORT_SYMBOL(unregister_inetaddr_notifier);
1da177e4 1095
9f9354b9
ED		 1096/* Rename ifa_labels for a device name change. Make some effort to preserve
1097 * existing alias numbering and to create unique labels if possible.
1da177e4
LT		 1098*/
1099static void inetdev_changename(struct net_device *dev, struct in_device *in_dev)
e905a9ed 1100{
1da177e4
LT		 1101 struct in_ifaddr *ifa;
1102 int named = 0;
1103
e905a9ed
YH		 1104 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1105 char old[IFNAMSIZ], *dot;
1da177e4
LT		 1106
1107 memcpy(old, ifa->ifa_label, IFNAMSIZ);
e905a9ed 1108 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1da177e4 1109 if (named++ == 0)
573bf470 1110 goto skip;
44344b2a 1111 dot = strchr(old, ':');
e905a9ed
YH		 1112 if (dot == NULL) {
1113 sprintf(old, ":%d", named);
1da177e4
LT		 1114 dot = old;
1115 }
9f9354b9 1116 if (strlen(dot) + strlen(dev->name) < IFNAMSIZ)
e905a9ed 1117 strcat(ifa->ifa_label, dot);
9f9354b9 1118 else
e905a9ed 1119 strcpy(ifa->ifa_label + (IFNAMSIZ - strlen(dot) - 1), dot);
573bf470
TG		 1120skip:
1121 rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0);
e905a9ed
YH		 1122 }
1123}
1da177e4 1124
40384999 1125static bool inetdev_valid_mtu(unsigned int mtu)
06770843
BL		 1126{
1127 return mtu >= 68;
1128}
1129
d11327ad
IC		 1130static void inetdev_send_gratuitous_arp(struct net_device *dev,
1131 struct in_device *in_dev)
1132
1133{
b76d0789 1134 struct in_ifaddr *ifa;
d11327ad 1135
b76d0789
ZK		 1136 for (ifa = in_dev->ifa_list; ifa;
1137 ifa = ifa->ifa_next) {
1138 arp_send(ARPOP_REQUEST, ETH_P_ARP,
1139 ifa->ifa_local, dev,
1140 ifa->ifa_local, NULL,
1141 dev->dev_addr, NULL);
1142 }
d11327ad
IC		 1143}
1144
1da177e4
LT		 1145/* Called only under RTNL semaphore */
1146
1147static int inetdev_event(struct notifier_block *this, unsigned long event,
1148 void *ptr)
1149{
1150 struct net_device *dev = ptr;
748e2d93 1151 struct in_device *in_dev = __in_dev_get_rtnl(dev);
0115e8e3 1152
1da177e4
LT		 1153 ASSERT_RTNL();
1154
1155 if (!in_dev) {
8030f544 1156 if (event == NETDEV_REGISTER) {
1da177e4 1157 in_dev = inetdev_init(dev);
b217d616
HX		 1158 if (!in_dev)
1159 return notifier_from_errno(-ENOMEM);
0cc217e1 1160 if (dev->flags & IFF_LOOPBACK) {
42f811b8
HX		 1161 IN_DEV_CONF_SET(in_dev, NOXFRM, 1);
1162 IN_DEV_CONF_SET(in_dev, NOPOLICY, 1);
8030f544 1163 }
06770843
BL		 1164 } else if (event == NETDEV_CHANGEMTU) {
1165 /* Re-enabling IP */
1166 if (inetdev_valid_mtu(dev->mtu))
1167 in_dev = inetdev_init(dev);
1da177e4
LT		 1168 }
1169 goto out;
1170 }
1171
1172 switch (event) {
1173 case NETDEV_REGISTER:
91df42be 1174 pr_debug("%s: bug\n", __func__);
a9b3cd7f 1175 RCU_INIT_POINTER(dev->ip_ptr, NULL);
1da177e4
LT		 1176 break;
1177 case NETDEV_UP:
06770843 1178 if (!inetdev_valid_mtu(dev->mtu))
1da177e4 1179 break;
0cc217e1 1180 if (dev->flags & IFF_LOOPBACK) {
9f9354b9
ED		 1181 struct in_ifaddr *ifa = inet_alloc_ifa();
1182
1183 if (ifa) {
fd23c3b3 1184 INIT_HLIST_NODE(&ifa->hash);
1da177e4
LT		 1185 ifa->ifa_local =
1186 ifa->ifa_address = htonl(INADDR_LOOPBACK);
1187 ifa->ifa_prefixlen = 8;
1188 ifa->ifa_mask = inet_make_mask(8);
1189 in_dev_hold(in_dev);
1190 ifa->ifa_dev = in_dev;
1191 ifa->ifa_scope = RT_SCOPE_HOST;
1192 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1193 inet_insert_ifa(ifa);
1194 }
1195 }
1196 ip_mc_up(in_dev);
eefef1cf
SH		 1197 /* fall through */
1198 case NETDEV_CHANGEADDR:
d11327ad
IC		 1199 if (!IN_DEV_ARP_NOTIFY(in_dev))
1200 break;
1201 /* fall through */
1202 case NETDEV_NOTIFY_PEERS:
a21090cf 1203 /* Send gratuitous ARP to notify of link change */
d11327ad 1204 inetdev_send_gratuitous_arp(dev, in_dev);
1da177e4
LT		 1205 break;
1206 case NETDEV_DOWN:
1207 ip_mc_down(in_dev);
1208 break;
93d9b7d7 1209 case NETDEV_PRE_TYPE_CHANGE:
75c78500
MS		 1210 ip_mc_unmap(in_dev);
1211 break;
93d9b7d7 1212 case NETDEV_POST_TYPE_CHANGE:
75c78500
MS		 1213 ip_mc_remap(in_dev);
1214 break;
1da177e4 1215 case NETDEV_CHANGEMTU:
06770843 1216 if (inetdev_valid_mtu(dev->mtu))
1da177e4 1217 break;
06770843 1218 /* disable IP when MTU is not enough */
1da177e4
LT		 1219 case NETDEV_UNREGISTER:
1220 inetdev_destroy(in_dev);
1221 break;
1222 case NETDEV_CHANGENAME:
1223 /* Do not notify about label change, this event is
1224 * not interesting to applications using netlink.
1225 */
1226 inetdev_changename(dev, in_dev);
1227
51602b2a 1228 devinet_sysctl_unregister(in_dev);
66f27a52 1229 devinet_sysctl_register(in_dev);
1da177e4
LT		 1230 break;
1231 }
1232out:
1233 return NOTIFY_DONE;
1234}
1235
1236static struct notifier_block ip_netdev_notifier = {
539afedf 1237 .notifier_call = inetdev_event,
1da177e4
LT		 1238};
1239
40384999 1240static size_t inet_nlmsg_size(void)
339bf98f
TG		 1241{
1242 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
1243 + nla_total_size(4) /* IFA_ADDRESS */
1244 + nla_total_size(4) /* IFA_LOCAL */
1245 + nla_total_size(4) /* IFA_BROADCAST */
339bf98f
TG		 1246 + nla_total_size(IFNAMSIZ); /* IFA_LABEL */
1247}
1248
1da177e4 1249static int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa,
15e47304 1250 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4
LT		 1251{
1252 struct ifaddrmsg *ifm;
1253 struct nlmsghdr *nlh;
1da177e4 1254
15e47304 1255 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*ifm), flags);
47f68512 1256 if (nlh == NULL)
26932566 1257 return -EMSGSIZE;
47f68512
TG		 1258
1259 ifm = nlmsg_data(nlh);
1da177e4
LT		 1260 ifm->ifa_family = AF_INET;
1261 ifm->ifa_prefixlen = ifa->ifa_prefixlen;
1262 ifm->ifa_flags = ifa->ifa_flags|IFA_F_PERMANENT;
1263 ifm->ifa_scope = ifa->ifa_scope;
1264 ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
47f68512 1265
f3756b79
DM		 1266 if ((ifa->ifa_address &&
1267 nla_put_be32(skb, IFA_ADDRESS, ifa->ifa_address)) ||
1268 (ifa->ifa_local &&
1269 nla_put_be32(skb, IFA_LOCAL, ifa->ifa_local)) ||
1270 (ifa->ifa_broadcast &&
1271 nla_put_be32(skb, IFA_BROADCAST, ifa->ifa_broadcast)) ||
1272 (ifa->ifa_label[0] &&
1273 nla_put_string(skb, IFA_LABEL, ifa->ifa_label)))
1274 goto nla_put_failure;
1da177e4 1275
47f68512
TG		 1276 return nlmsg_end(skb, nlh);
1277
1278nla_put_failure:
26932566
PM		 1279 nlmsg_cancel(skb, nlh);
1280 return -EMSGSIZE;
1da177e4
LT		 1281}
1282
1283static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
1284{
3b1e0a65 1285 struct net *net = sock_net(skb->sk);
eec4df98
ED		 1286 int h, s_h;
1287 int idx, s_idx;
1288 int ip_idx, s_ip_idx;
1da177e4
LT		 1289 struct net_device *dev;
1290 struct in_device *in_dev;
1291 struct in_ifaddr *ifa;
eec4df98
ED		 1292 struct hlist_head *head;
1293 struct hlist_node *node;
1da177e4 1294
eec4df98
ED		 1295 s_h = cb->args[0];
1296 s_idx = idx = cb->args[1];
1297 s_ip_idx = ip_idx = cb->args[2];
1298
1299 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1300 idx = 0;
1301 head = &net->dev_index_head[h];
1302 rcu_read_lock();
1303 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
1304 if (idx < s_idx)
1305 goto cont;
4b97efdf 1306 if (h > s_h || idx > s_idx)
eec4df98
ED		 1307 s_ip_idx = 0;
1308 in_dev = __in_dev_get_rcu(dev);
1309 if (!in_dev)
1310 goto cont;
1da177e4 1311
eec4df98
ED		 1312 for (ifa = in_dev->ifa_list, ip_idx = 0; ifa;
1313 ifa = ifa->ifa_next, ip_idx++) {
1314 if (ip_idx < s_ip_idx)
1315 continue;
1316 if (inet_fill_ifaddr(skb, ifa,
15e47304 1317 NETLINK_CB(cb->skb).portid,
1da177e4 1318 cb->nlh->nlmsg_seq,
eec4df98
ED		 1319 RTM_NEWADDR, NLM_F_MULTI) <= 0) {
1320 rcu_read_unlock();
1321 goto done;
1322 }
1323 }
7562f876 1324cont:
eec4df98
ED		 1325 idx++;
1326 }
1327 rcu_read_unlock();
1da177e4
LT		 1328 }
1329
1330done:
eec4df98
ED		 1331 cb->args[0] = h;
1332 cb->args[1] = idx;
1333 cb->args[2] = ip_idx;
1da177e4
LT		 1334
1335 return skb->len;
1336}
1337
539afedf 1338static void rtmsg_ifa(int event, struct in_ifaddr *ifa, struct nlmsghdr *nlh,
15e47304 1339 u32 portid)
1da177e4 1340{
47f68512 1341 struct sk_buff *skb;
d6062cbb
TG		 1342 u32 seq = nlh ? nlh->nlmsg_seq : 0;
1343 int err = -ENOBUFS;
4b8aa9ab 1344 struct net *net;
1da177e4 1345
c346dca1 1346 net = dev_net(ifa->ifa_dev->dev);
339bf98f 1347 skb = nlmsg_new(inet_nlmsg_size(), GFP_KERNEL);
47f68512 1348 if (skb == NULL)
d6062cbb
TG		 1349 goto errout;
1350
15e47304 1351 err = inet_fill_ifaddr(skb, ifa, portid, seq, event, 0);
26932566
PM		 1352 if (err < 0) {
1353 /* -EMSGSIZE implies BUG in inet_nlmsg_size() */
1354 WARN_ON(err == -EMSGSIZE);
1355 kfree_skb(skb);
1356 goto errout;
1357 }
15e47304 1358 rtnl_notify(skb, net, portid, RTNLGRP_IPV4_IFADDR, nlh, GFP_KERNEL);
1ce85fe4 1359 return;
d6062cbb
TG		 1360errout:
1361 if (err < 0)
4b8aa9ab 1362 rtnl_set_sk_err(net, RTNLGRP_IPV4_IFADDR, err);
1da177e4
LT		 1363}
1364
9f0f7272
TG		 1365static size_t inet_get_link_af_size(const struct net_device *dev)
1366{
1fc19aff 1367 struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr);
9f0f7272
TG		 1368
1369 if (!in_dev)
1370 return 0;
1371
1372 return nla_total_size(IPV4_DEVCONF_MAX * 4); /* IFLA_INET_CONF */
1373}
1374
1375static int inet_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
1376{
1fc19aff 1377 struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr);
9f0f7272
TG		 1378 struct nlattr *nla;
1379 int i;
1380
1381 if (!in_dev)
1382 return -ENODATA;
1383
1384 nla = nla_reserve(skb, IFLA_INET_CONF, IPV4_DEVCONF_MAX * 4);
1385 if (nla == NULL)
1386 return -EMSGSIZE;
1387
1388 for (i = 0; i < IPV4_DEVCONF_MAX; i++)
1389 ((u32 *) nla_data(nla))[i] = in_dev->cnf.data[i];
1390
1391 return 0;
1392}
1393
1394static const struct nla_policy inet_af_policy[IFLA_INET_MAX+1] = {
1395 [IFLA_INET_CONF] = { .type = NLA_NESTED },
1396};
1397
cf7afbfe
TG		 1398static int inet_validate_link_af(const struct net_device *dev,
1399 const struct nlattr *nla)
9f0f7272 1400{
9f0f7272
TG		 1401 struct nlattr *a, *tb[IFLA_INET_MAX+1];
1402 int err, rem;
1403
f7fce74e 1404 if (dev && !__in_dev_get_rtnl(dev))
cf7afbfe 1405 return -EAFNOSUPPORT;
9f0f7272
TG		 1406
1407 err = nla_parse_nested(tb, IFLA_INET_MAX, nla, inet_af_policy);
1408 if (err < 0)
1409 return err;
1410
1411 if (tb[IFLA_INET_CONF]) {
1412 nla_for_each_nested(a, tb[IFLA_INET_CONF], rem) {
1413 int cfgid = nla_type(a);
1414
1415 if (nla_len(a) < 4)
1416 return -EINVAL;
1417
1418 if (cfgid <= 0 || cfgid > IPV4_DEVCONF_MAX)
1419 return -EINVAL;
1420 }
1421 }
1422
cf7afbfe
TG		 1423 return 0;
1424}
1425
1426static int inet_set_link_af(struct net_device *dev, const struct nlattr *nla)
1427{
f7fce74e 1428 struct in_device *in_dev = __in_dev_get_rtnl(dev);
cf7afbfe
TG		 1429 struct nlattr *a, *tb[IFLA_INET_MAX+1];
1430 int rem;
1431
1432 if (!in_dev)
1433 return -EAFNOSUPPORT;
1434
1435 if (nla_parse_nested(tb, IFLA_INET_MAX, nla, NULL) < 0)
1436 BUG();
1437
9f0f7272
TG		 1438 if (tb[IFLA_INET_CONF]) {
1439 nla_for_each_nested(a, tb[IFLA_INET_CONF], rem)
1440 ipv4_devconf_set(in_dev, nla_type(a), nla_get_u32(a));
1441 }
1442
1443 return 0;
1444}
1445
edc9e748
ND		 1446static int inet_netconf_msgsize_devconf(int type)
1447{
1448 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
1449 + nla_total_size(4); /* NETCONFA_IFINDEX */
1450
9e551110
ND		 1451 /* type -1 is used for ALL */
1452 if (type == -1 || type == NETCONFA_FORWARDING)
edc9e748 1453 size += nla_total_size(4);
cc535dfb
ND		 1454 if (type == -1 || type == NETCONFA_RP_FILTER)
1455 size += nla_total_size(4);
edc9e748
ND		 1456
1457 return size;
1458}
1459
1460static int inet_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
1461 struct ipv4_devconf *devconf, u32 portid,
1462 u32 seq, int event, unsigned int flags,
1463 int type)
1464{
1465 struct nlmsghdr *nlh;
1466 struct netconfmsg *ncm;
1467
1468 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
1469 flags);
1470 if (nlh == NULL)
1471 return -EMSGSIZE;
1472
1473 ncm = nlmsg_data(nlh);
1474 ncm->ncm_family = AF_INET;
1475
1476 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
1477 goto nla_put_failure;
1478
9e551110
ND		 1479 /* type -1 is used for ALL */
1480 if ((type == -1 || type == NETCONFA_FORWARDING) &&
edc9e748
ND		 1481 nla_put_s32(skb, NETCONFA_FORWARDING,
1482 IPV4_DEVCONF(*devconf, FORWARDING)) < 0)
1483 goto nla_put_failure;
cc535dfb
ND		 1484 if ((type == -1 || type == NETCONFA_RP_FILTER) &&
1485 nla_put_s32(skb, NETCONFA_RP_FILTER,
1486 IPV4_DEVCONF(*devconf, RP_FILTER)) < 0)
1487 goto nla_put_failure;
edc9e748
ND		 1488
1489 return nlmsg_end(skb, nlh);
1490
1491nla_put_failure:
1492 nlmsg_cancel(skb, nlh);
1493 return -EMSGSIZE;
1494}
1495
1496static void inet_netconf_notify_devconf(struct net *net, int type, int ifindex,
1497 struct ipv4_devconf *devconf)
1498{
1499 struct sk_buff *skb;
1500 int err = -ENOBUFS;
1501
1502 skb = nlmsg_new(inet_netconf_msgsize_devconf(type), GFP_ATOMIC);
1503 if (skb == NULL)
1504 goto errout;
1505
1506 err = inet_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
1507 RTM_NEWNETCONF, 0, type);
1508 if (err < 0) {
1509 /* -EMSGSIZE implies BUG in inet_netconf_msgsize_devconf() */
1510 WARN_ON(err == -EMSGSIZE);
1511 kfree_skb(skb);
1512 goto errout;
1513 }
1514 rtnl_notify(skb, net, 0, RTNLGRP_IPV4_NETCONF, NULL, GFP_ATOMIC);
1515 return;
1516errout:
1517 if (err < 0)
1518 rtnl_set_sk_err(net, RTNLGRP_IPV4_NETCONF, err);
1519}
1520
9e551110
ND		 1521static const struct nla_policy devconf_ipv4_policy[NETCONFA_MAX+1] = {
1522 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
1523 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
cc535dfb 1524 [NETCONFA_RP_FILTER] = { .len = sizeof(int) },
9e551110
ND		 1525};
1526
1527static int inet_netconf_get_devconf(struct sk_buff *in_skb,
1528 struct nlmsghdr *nlh,
1529 void *arg)
1530{
1531 struct net *net = sock_net(in_skb->sk);
1532 struct nlattr *tb[NETCONFA_MAX+1];
1533 struct netconfmsg *ncm;
1534 struct sk_buff *skb;
1535 struct ipv4_devconf *devconf;
1536 struct in_device *in_dev;
1537 struct net_device *dev;
1538 int ifindex;
1539 int err;
1540
1541 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
1542 devconf_ipv4_policy);
1543 if (err < 0)
1544 goto errout;
1545
1546 err = EINVAL;
1547 if (!tb[NETCONFA_IFINDEX])
1548 goto errout;
1549
1550 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
1551 switch (ifindex) {
1552 case NETCONFA_IFINDEX_ALL:
1553 devconf = net->ipv4.devconf_all;
1554 break;
1555 case NETCONFA_IFINDEX_DEFAULT:
1556 devconf = net->ipv4.devconf_dflt;
1557 break;
1558 default:
1559 dev = __dev_get_by_index(net, ifindex);
1560 if (dev == NULL)
1561 goto errout;
1562 in_dev = __in_dev_get_rtnl(dev);
1563 if (in_dev == NULL)
1564 goto errout;
1565 devconf = &in_dev->cnf;
1566 break;
1567 }
1568
1569 err = -ENOBUFS;
1570 skb = nlmsg_new(inet_netconf_msgsize_devconf(-1), GFP_ATOMIC);
1571 if (skb == NULL)
1572 goto errout;
1573
1574 err = inet_netconf_fill_devconf(skb, ifindex, devconf,
1575 NETLINK_CB(in_skb).portid,
1576 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
1577 -1);
1578 if (err < 0) {
1579 /* -EMSGSIZE implies BUG in inet_netconf_msgsize_devconf() */
1580 WARN_ON(err == -EMSGSIZE);
1581 kfree_skb(skb);
1582 goto errout;
1583 }
1584 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
1585errout:
1586 return err;
1587}
1588
1da177e4
LT		 1589#ifdef CONFIG_SYSCTL
1590
c0ce9fb3 1591static void devinet_copy_dflt_conf(struct net *net, int i)
31be3085
HX		 1592{
1593 struct net_device *dev;
1594
c6d14c84
ED		 1595 rcu_read_lock();
1596 for_each_netdev_rcu(net, dev) {
31be3085 1597 struct in_device *in_dev;
c6d14c84 1598
31be3085
HX		 1599 in_dev = __in_dev_get_rcu(dev);
1600 if (in_dev && !test_bit(i, in_dev->cnf.state))
9355bbd6 1601 in_dev->cnf.data[i] = net->ipv4.devconf_dflt->data[i];
31be3085 1602 }
c6d14c84 1603 rcu_read_unlock();
31be3085
HX		 1604}
1605
c6d14c84 1606/* called with RTNL locked */
c0ce9fb3 1607static void inet_forward_change(struct net *net)
68dd299b
PE		 1608{
1609 struct net_device *dev;
586f1211 1610 int on = IPV4_DEVCONF_ALL(net, FORWARDING);
68dd299b 1611
586f1211 1612 IPV4_DEVCONF_ALL(net, ACCEPT_REDIRECTS) = !on;
9355bbd6 1613 IPV4_DEVCONF_DFLT(net, FORWARDING) = on;
edc9e748
ND		 1614 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING,
1615 NETCONFA_IFINDEX_ALL,
1616 net->ipv4.devconf_all);
1617 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING,
1618 NETCONFA_IFINDEX_DEFAULT,
1619 net->ipv4.devconf_dflt);
68dd299b 1620
c0ce9fb3 1621 for_each_netdev(net, dev) {
68dd299b 1622 struct in_device *in_dev;
0187bdfb
BH		 1623 if (on)
1624 dev_disable_lro(dev);
68dd299b
PE		 1625 rcu_read_lock();
1626 in_dev = __in_dev_get_rcu(dev);
edc9e748 1627 if (in_dev) {
68dd299b 1628 IN_DEV_CONF_SET(in_dev, FORWARDING, on);
edc9e748
ND		 1629 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING,
1630 dev->ifindex, &in_dev->cnf);
1631 }
68dd299b
PE		 1632 rcu_read_unlock();
1633 }
68dd299b
PE		 1634}
1635
31be3085 1636static int devinet_conf_proc(ctl_table *ctl, int write,
8d65af78 1637 void __user *buffer,
31be3085
HX		 1638 size_t *lenp, loff_t *ppos)
1639{
d01ff0a0 1640 int old_value = *(int *)ctl->data;
8d65af78 1641 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
d01ff0a0 1642 int new_value = *(int *)ctl->data;
31be3085
HX		 1643
1644 if (write) {
1645 struct ipv4_devconf *cnf = ctl->extra1;
c0ce9fb3 1646 struct net *net = ctl->extra2;
31be3085
HX		 1647 int i = (int *)ctl->data - cnf->data;
1648
1649 set_bit(i, cnf->state);
1650
9355bbd6 1651 if (cnf == net->ipv4.devconf_dflt)
c0ce9fb3 1652 devinet_copy_dflt_conf(net, i);
d0daebc3
TG		 1653 if (i == IPV4_DEVCONF_ACCEPT_LOCAL - 1 ||
1654 i == IPV4_DEVCONF_ROUTE_LOCALNET - 1)
d01ff0a0 1655 if ((new_value == 0) && (old_value != 0))
4ccfe6d4 1656 rt_cache_flush(net);
cc535dfb
ND		 1657 if (i == IPV4_DEVCONF_RP_FILTER - 1 &&
1658 new_value != old_value) {
1659 int ifindex;
1660
1661 if (cnf == net->ipv4.devconf_dflt)
1662 ifindex = NETCONFA_IFINDEX_DEFAULT;
1663 else if (cnf == net->ipv4.devconf_all)
1664 ifindex = NETCONFA_IFINDEX_ALL;
1665 else {
1666 struct in_device *idev =
1667 container_of(cnf, struct in_device,
1668 cnf);
1669 ifindex = idev->dev->ifindex;
1670 }
1671 inet_netconf_notify_devconf(net, NETCONFA_RP_FILTER,
1672 ifindex, cnf);
1673 }
31be3085
HX		 1674 }
1675
1676 return ret;
1677}
1678
1da177e4 1679static int devinet_sysctl_forward(ctl_table *ctl, int write,
8d65af78 1680 void __user *buffer,
1da177e4
LT		 1681 size_t *lenp, loff_t *ppos)
1682{
1683 int *valp = ctl->data;
1684 int val = *valp;
88af182e 1685 loff_t pos = *ppos;
8d65af78 1686 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
1da177e4
LT		 1687
1688 if (write && *valp != val) {
c0ce9fb3
PE		 1689 struct net *net = ctl->extra2;
1690
0187bdfb 1691 if (valp != &IPV4_DEVCONF_DFLT(net, FORWARDING)) {
88af182e
EB		 1692 if (!rtnl_trylock()) {
1693 /* Restore the original values before restarting */
1694 *valp = val;
1695 *ppos = pos;
9b8adb5e 1696 return restart_syscall();
88af182e 1697 }
0187bdfb
BH		 1698 if (valp == &IPV4_DEVCONF_ALL(net, FORWARDING)) {
1699 inet_forward_change(net);
edc9e748 1700 } else {
0187bdfb
BH		 1701 struct ipv4_devconf *cnf = ctl->extra1;
1702 struct in_device *idev =
1703 container_of(cnf, struct in_device, cnf);
edc9e748
ND		 1704 if (*valp)
1705 dev_disable_lro(idev->dev);
1706 inet_netconf_notify_devconf(net,
1707 NETCONFA_FORWARDING,
1708 idev->dev->ifindex,
1709 cnf);
0187bdfb
BH		 1710 }
1711 rtnl_unlock();
4ccfe6d4 1712 rt_cache_flush(net);
edc9e748
ND		 1713 } else
1714 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING,
1715 NETCONFA_IFINDEX_DEFAULT,
1716 net->ipv4.devconf_dflt);
1da177e4
LT		 1717 }
1718
1719 return ret;
1720}
1721
323e126f
DM		 1722static int ipv4_doint_and_flush(ctl_table *ctl, int write,
1723 void __user *buffer,
1724 size_t *lenp, loff_t *ppos)
1da177e4
LT		 1725{
1726 int *valp = ctl->data;
1727 int val = *valp;
8d65af78 1728 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
76e6ebfb 1729 struct net *net = ctl->extra2;
1da177e4
LT		 1730
1731 if (write && *valp != val)
4ccfe6d4 1732 rt_cache_flush(net);
1da177e4
LT		 1733
1734 return ret;
1735}
1736
f8572d8f 1737#define DEVINET_SYSCTL_ENTRY(attr, name, mval, proc) \
42f811b8 1738 { \
42f811b8
HX		 1739 .procname = name, \
1740 .data = ipv4_devconf.data + \
02291680 1741 IPV4_DEVCONF_ ## attr - 1, \
42f811b8
HX		 1742 .maxlen = sizeof(int), \
1743 .mode = mval, \
1744 .proc_handler = proc, \
31be3085 1745 .extra1 = &ipv4_devconf, \
42f811b8
HX		 1746 }
1747
1748#define DEVINET_SYSCTL_RW_ENTRY(attr, name) \
f8572d8f 1749 DEVINET_SYSCTL_ENTRY(attr, name, 0644, devinet_conf_proc)
42f811b8
HX		 1750
1751#define DEVINET_SYSCTL_RO_ENTRY(attr, name) \
f8572d8f 1752 DEVINET_SYSCTL_ENTRY(attr, name, 0444, devinet_conf_proc)
42f811b8 1753
f8572d8f
EB		 1754#define DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, proc) \
1755 DEVINET_SYSCTL_ENTRY(attr, name, 0644, proc)
42f811b8
HX		 1756
1757#define DEVINET_SYSCTL_FLUSHING_ENTRY(attr, name) \
f8572d8f 1758 DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, ipv4_doint_and_flush)
42f811b8 1759
1da177e4
LT		 1760static struct devinet_sysctl_table {
1761 struct ctl_table_header *sysctl_header;
02291680 1762 struct ctl_table devinet_vars[__IPV4_DEVCONF_MAX];
1da177e4
LT		 1763} devinet_sysctl = {
1764 .devinet_vars = {
42f811b8 1765 DEVINET_SYSCTL_COMPLEX_ENTRY(FORWARDING, "forwarding",
f8572d8f 1766 devinet_sysctl_forward),
42f811b8
HX		 1767 DEVINET_SYSCTL_RO_ENTRY(MC_FORWARDING, "mc_forwarding"),
1768
1769 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_REDIRECTS, "accept_redirects"),
1770 DEVINET_SYSCTL_RW_ENTRY(SECURE_REDIRECTS, "secure_redirects"),
1771 DEVINET_SYSCTL_RW_ENTRY(SHARED_MEDIA, "shared_media"),
1772 DEVINET_SYSCTL_RW_ENTRY(RP_FILTER, "rp_filter"),
1773 DEVINET_SYSCTL_RW_ENTRY(SEND_REDIRECTS, "send_redirects"),
1774 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_SOURCE_ROUTE,
1775 "accept_source_route"),
8153a10c 1776 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_LOCAL, "accept_local"),
28f6aeea 1777 DEVINET_SYSCTL_RW_ENTRY(SRC_VMARK, "src_valid_mark"),
42f811b8
HX		 1778 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP, "proxy_arp"),
1779 DEVINET_SYSCTL_RW_ENTRY(MEDIUM_ID, "medium_id"),
1780 DEVINET_SYSCTL_RW_ENTRY(BOOTP_RELAY, "bootp_relay"),
1781 DEVINET_SYSCTL_RW_ENTRY(LOG_MARTIANS, "log_martians"),
1782 DEVINET_SYSCTL_RW_ENTRY(TAG, "tag"),
1783 DEVINET_SYSCTL_RW_ENTRY(ARPFILTER, "arp_filter"),
1784 DEVINET_SYSCTL_RW_ENTRY(ARP_ANNOUNCE, "arp_announce"),
1785 DEVINET_SYSCTL_RW_ENTRY(ARP_IGNORE, "arp_ignore"),
1786 DEVINET_SYSCTL_RW_ENTRY(ARP_ACCEPT, "arp_accept"),
eefef1cf 1787 DEVINET_SYSCTL_RW_ENTRY(ARP_NOTIFY, "arp_notify"),
65324144 1788 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP_PVLAN, "proxy_arp_pvlan"),
42f811b8
HX		 1789
1790 DEVINET_SYSCTL_FLUSHING_ENTRY(NOXFRM, "disable_xfrm"),
1791 DEVINET_SYSCTL_FLUSHING_ENTRY(NOPOLICY, "disable_policy"),
1792 DEVINET_SYSCTL_FLUSHING_ENTRY(FORCE_IGMP_VERSION,
1793 "force_igmp_version"),
1794 DEVINET_SYSCTL_FLUSHING_ENTRY(PROMOTE_SECONDARIES,
1795 "promote_secondaries"),
d0daebc3
TG		 1796 DEVINET_SYSCTL_FLUSHING_ENTRY(ROUTE_LOCALNET,
1797 "route_localnet"),
1da177e4 1798 },
1da177e4
LT		 1799};
1800
ea40b324 1801static int __devinet_sysctl_register(struct net *net, char *dev_name,
f8572d8f 1802 struct ipv4_devconf *p)
1da177e4
LT		 1803{
1804 int i;
9fa89642 1805 struct devinet_sysctl_table *t;
8607ddb8 1806 char path[sizeof("net/ipv4/conf/") + IFNAMSIZ];
bfada697 1807
9fa89642 1808 t = kmemdup(&devinet_sysctl, sizeof(*t), GFP_KERNEL);
1da177e4 1809 if (!t)
9fa89642
PE		 1810 goto out;
1811
1da177e4
LT		 1812 for (i = 0; i < ARRAY_SIZE(t->devinet_vars) - 1; i++) {
1813 t->devinet_vars[i].data += (char *)p - (char *)&ipv4_devconf;
31be3085 1814 t->devinet_vars[i].extra1 = p;
c0ce9fb3 1815 t->devinet_vars[i].extra2 = net;
1da177e4
LT		 1816 }
1817
464dc801
EB		 1818 /* Don't export sysctls to unprivileged users */
1819 if (net->user_ns != &init_user_ns)
1820 t->devinet_vars[0].procname = NULL;
1821
8607ddb8 1822 snprintf(path, sizeof(path), "net/ipv4/conf/%s", dev_name);
1da177e4 1823
8607ddb8 1824 t->sysctl_header = register_net_sysctl(net, path, t->devinet_vars);
1da177e4 1825 if (!t->sysctl_header)
8607ddb8 1826 goto free;
1da177e4
LT		 1827
1828 p->sysctl = t;
ea40b324 1829 return 0;
1da177e4 1830
9fa89642 1831free:
1da177e4 1832 kfree(t);
9fa89642 1833out:
ea40b324 1834 return -ENOBUFS;
1da177e4
LT		 1835}
1836
51602b2a
PE		 1837static void __devinet_sysctl_unregister(struct ipv4_devconf *cnf)
1838{
1839 struct devinet_sysctl_table *t = cnf->sysctl;
1840
1841 if (t == NULL)
1842 return;
1843
1844 cnf->sysctl = NULL;
ff538818 1845 unregister_net_sysctl_table(t->sysctl_header);
51602b2a
PE		 1846 kfree(t);
1847}
1848
66f27a52
PE		 1849static void devinet_sysctl_register(struct in_device *idev)
1850{
54716e3b 1851 neigh_sysctl_register(idev->dev, idev->arp_parms, "ipv4", NULL);
c346dca1 1852 __devinet_sysctl_register(dev_net(idev->dev), idev->dev->name,
f8572d8f 1853 &idev->cnf);
66f27a52
PE		 1854}
1855
51602b2a 1856static void devinet_sysctl_unregister(struct in_device *idev)
1da177e4 1857{
51602b2a
PE		 1858 __devinet_sysctl_unregister(&idev->cnf);
1859 neigh_sysctl_unregister(idev->arp_parms);
1da177e4 1860}
1da177e4 1861
68dd299b
PE		 1862static struct ctl_table ctl_forward_entry[] = {
1863 {
68dd299b
PE		 1864 .procname = "ip_forward",
1865 .data = &ipv4_devconf.data[
02291680 1866 IPV4_DEVCONF_FORWARDING - 1],
68dd299b
PE		 1867 .maxlen = sizeof(int),
1868 .mode = 0644,
1869 .proc_handler = devinet_sysctl_forward,
68dd299b 1870 .extra1 = &ipv4_devconf,
c0ce9fb3 1871 .extra2 = &init_net,
68dd299b
PE		 1872 },
1873 { },
1874};
2a75de0c 1875#endif
68dd299b 1876
752d14dc
PE		 1877static __net_init int devinet_init_net(struct net *net)
1878{
1879 int err;
752d14dc 1880 struct ipv4_devconf *all, *dflt;
2a75de0c
ED		 1881#ifdef CONFIG_SYSCTL
1882 struct ctl_table *tbl = ctl_forward_entry;
752d14dc 1883 struct ctl_table_header *forw_hdr;
2a75de0c 1884#endif
752d14dc
PE		 1885
1886 err = -ENOMEM;
1887 all = &ipv4_devconf;
1888 dflt = &ipv4_devconf_dflt;
752d14dc 1889
09ad9bc7 1890 if (!net_eq(net, &init_net)) {
752d14dc
PE		 1891 all = kmemdup(all, sizeof(ipv4_devconf), GFP_KERNEL);
1892 if (all == NULL)
1893 goto err_alloc_all;
1894
1895 dflt = kmemdup(dflt, sizeof(ipv4_devconf_dflt), GFP_KERNEL);
1896 if (dflt == NULL)
1897 goto err_alloc_dflt;
1898
2a75de0c 1899#ifdef CONFIG_SYSCTL
752d14dc
PE		 1900 tbl = kmemdup(tbl, sizeof(ctl_forward_entry), GFP_KERNEL);
1901 if (tbl == NULL)
1902 goto err_alloc_ctl;
1903
02291680 1904 tbl[0].data = &all->data[IPV4_DEVCONF_FORWARDING - 1];
752d14dc
PE		 1905 tbl[0].extra1 = all;
1906 tbl[0].extra2 = net;
464dc801
EB		 1907
1908 /* Don't export sysctls to unprivileged users */
1909 if (net->user_ns != &init_user_ns)
1910 tbl[0].procname = NULL;
2a75de0c 1911#endif
752d14dc
PE		 1912 }
1913
1914#ifdef CONFIG_SYSCTL
f8572d8f 1915 err = __devinet_sysctl_register(net, "all", all);
752d14dc
PE		 1916 if (err < 0)
1917 goto err_reg_all;
1918
f8572d8f 1919 err = __devinet_sysctl_register(net, "default", dflt);
752d14dc
PE		 1920 if (err < 0)
1921 goto err_reg_dflt;
1922
1923 err = -ENOMEM;
8607ddb8 1924 forw_hdr = register_net_sysctl(net, "net/ipv4", tbl);
752d14dc
PE		 1925 if (forw_hdr == NULL)
1926 goto err_reg_ctl;
2a75de0c 1927 net->ipv4.forw_hdr = forw_hdr;
752d14dc
PE		 1928#endif
1929
752d14dc
PE		 1930 net->ipv4.devconf_all = all;
1931 net->ipv4.devconf_dflt = dflt;
1932 return 0;
1933
1934#ifdef CONFIG_SYSCTL
1935err_reg_ctl:
1936 __devinet_sysctl_unregister(dflt);
1937err_reg_dflt:
1938 __devinet_sysctl_unregister(all);
1939err_reg_all:
1940 if (tbl != ctl_forward_entry)
1941 kfree(tbl);
752d14dc 1942err_alloc_ctl:
2a75de0c 1943#endif
752d14dc
PE		 1944 if (dflt != &ipv4_devconf_dflt)
1945 kfree(dflt);
1946err_alloc_dflt:
1947 if (all != &ipv4_devconf)
1948 kfree(all);
1949err_alloc_all:
1950 return err;
1951}
1952
1953static __net_exit void devinet_exit_net(struct net *net)
1954{
2a75de0c 1955#ifdef CONFIG_SYSCTL
752d14dc
PE		 1956 struct ctl_table *tbl;
1957
1958 tbl = net->ipv4.forw_hdr->ctl_table_arg;
752d14dc
PE		 1959 unregister_net_sysctl_table(net->ipv4.forw_hdr);
1960 __devinet_sysctl_unregister(net->ipv4.devconf_dflt);
1961 __devinet_sysctl_unregister(net->ipv4.devconf_all);
752d14dc 1962 kfree(tbl);
2a75de0c 1963#endif
752d14dc
PE		 1964 kfree(net->ipv4.devconf_dflt);
1965 kfree(net->ipv4.devconf_all);
1966}
1967
1968static __net_initdata struct pernet_operations devinet_ops = {
1969 .init = devinet_init_net,
1970 .exit = devinet_exit_net,
1971};
1972
9f0f7272
TG		 1973static struct rtnl_af_ops inet_af_ops = {
1974 .family = AF_INET,
1975 .fill_link_af = inet_fill_link_af,
1976 .get_link_af_size = inet_get_link_af_size,
cf7afbfe
TG		 1977 .validate_link_af = inet_validate_link_af,
1978 .set_link_af = inet_set_link_af,
9f0f7272
TG		 1979};
1980
1da177e4
LT		 1981void __init devinet_init(void)
1982{
fd23c3b3
DM		 1983 int i;
1984
1985 for (i = 0; i < IN4_ADDR_HSIZE; i++)
1986 INIT_HLIST_HEAD(&inet_addr_lst[i]);
1987
752d14dc
PE		 1988 register_pernet_subsys(&devinet_ops);
1989
1da177e4
LT		 1990 register_gifconf(PF_INET, inet_gifconf);
1991 register_netdevice_notifier(&ip_netdev_notifier);
63f3444f 1992
9f0f7272
TG		 1993 rtnl_af_register(&inet_af_ops);
1994
c7ac8679
GR		 1995 rtnl_register(PF_INET, RTM_NEWADDR, inet_rtm_newaddr, NULL, NULL);
1996 rtnl_register(PF_INET, RTM_DELADDR, inet_rtm_deladdr, NULL, NULL);
1997 rtnl_register(PF_INET, RTM_GETADDR, NULL, inet_dump_ifaddr, NULL);
9e551110
ND		 1998 rtnl_register(PF_INET, RTM_GETNETCONF, inet_netconf_get_devconf,
1999 NULL, NULL);
1da177e4
LT		 2000}
2001
kernel source for telekom puls (alcatel/mediatek)