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Merge branch 'for-3.17' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/libata
[deliverable/linux.git] / net / ipv4 / devinet.c
CommitLineData
1da177e4
LT		 1/*
2 * NET3 IP device support routines.
3 *
1da177e4
LT		 4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
8 *
9 * Derived from the IP parts of dev.c 1.0.19
02c30a84 10 * Authors: Ross Biro
1da177e4
LT		 11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 * Mark Evans, <evansmp@uhura.aston.ac.uk>
13 *
14 * Additional Authors:
15 * Alan Cox, <gw4pts@gw4pts.ampr.org>
16 * Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
17 *
18 * Changes:
19 * Alexey Kuznetsov: pa_* fields are replaced with ifaddr
20 * lists.
21 * Cyrus Durgin: updated for kmod
22 * Matthias Andree: in devinet_ioctl, compare label and
23 * address (4.4BSD alias style support),
24 * fall back to comparing just the label
25 * if no match found.
26 */
27
1da177e4
LT		 28
29#include <asm/uaccess.h>
1da177e4 30#include <linux/bitops.h>
4fc268d2 31#include <linux/capability.h>
1da177e4
LT		 32#include <linux/module.h>
33#include <linux/types.h>
34#include <linux/kernel.h>
1da177e4
LT		 35#include <linux/string.h>
36#include <linux/mm.h>
37#include <linux/socket.h>
38#include <linux/sockios.h>
39#include <linux/in.h>
40#include <linux/errno.h>
41#include <linux/interrupt.h>
1823730f 42#include <linux/if_addr.h>
1da177e4
LT		 43#include <linux/if_ether.h>
44#include <linux/inet.h>
45#include <linux/netdevice.h>
46#include <linux/etherdevice.h>
47#include <linux/skbuff.h>
1da177e4
LT		 48#include <linux/init.h>
49#include <linux/notifier.h>
50#include <linux/inetdevice.h>
51#include <linux/igmp.h>
5a0e3ad6 52#include <linux/slab.h>
fd23c3b3 53#include <linux/hash.h>
1da177e4
LT		 54#ifdef CONFIG_SYSCTL
55#include <linux/sysctl.h>
56#endif
57#include <linux/kmod.h>
edc9e748 58#include <linux/netconf.h>
1da177e4 59
14c85021 60#include <net/arp.h>
1da177e4
LT		 61#include <net/ip.h>
62#include <net/route.h>
63#include <net/ip_fib.h>
63f3444f 64#include <net/rtnetlink.h>
752d14dc 65#include <net/net_namespace.h>
5c766d64 66#include <net/addrconf.h>
1da177e4 67
406b6f97
DM		 68#include "fib_lookup.h"
69
0027ba84 70static struct ipv4_devconf ipv4_devconf = {
42f811b8 71 .data = {
02291680
EB		 72 [IPV4_DEVCONF_ACCEPT_REDIRECTS - 1] = 1,
73 [IPV4_DEVCONF_SEND_REDIRECTS - 1] = 1,
74 [IPV4_DEVCONF_SECURE_REDIRECTS - 1] = 1,
75 [IPV4_DEVCONF_SHARED_MEDIA - 1] = 1,
2690048c
WM		 76 [IPV4_DEVCONF_IGMPV2_UNSOLICITED_REPORT_INTERVAL - 1] = 10000 /*ms*/,
77 [IPV4_DEVCONF_IGMPV3_UNSOLICITED_REPORT_INTERVAL - 1] = 1000 /*ms*/,
42f811b8 78 },
1da177e4
LT		 79};
80
81static struct ipv4_devconf ipv4_devconf_dflt = {
42f811b8 82 .data = {
02291680
EB		 83 [IPV4_DEVCONF_ACCEPT_REDIRECTS - 1] = 1,
84 [IPV4_DEVCONF_SEND_REDIRECTS - 1] = 1,
85 [IPV4_DEVCONF_SECURE_REDIRECTS - 1] = 1,
86 [IPV4_DEVCONF_SHARED_MEDIA - 1] = 1,
87 [IPV4_DEVCONF_ACCEPT_SOURCE_ROUTE - 1] = 1,
2690048c
WM		 88 [IPV4_DEVCONF_IGMPV2_UNSOLICITED_REPORT_INTERVAL - 1] = 10000 /*ms*/,
89 [IPV4_DEVCONF_IGMPV3_UNSOLICITED_REPORT_INTERVAL - 1] = 1000 /*ms*/,
42f811b8 90 },
1da177e4
LT		 91};
92
9355bbd6
PE		 93#define IPV4_DEVCONF_DFLT(net, attr) \
94 IPV4_DEVCONF((*net->ipv4.devconf_dflt), attr)
42f811b8 95
ef7c79ed 96static const struct nla_policy ifa_ipv4_policy[IFA_MAX+1] = {
5c753978
TG		 97 [IFA_LOCAL] = { .type = NLA_U32 },
98 [IFA_ADDRESS] = { .type = NLA_U32 },
99 [IFA_BROADCAST] = { .type = NLA_U32 },
5176f91e 100 [IFA_LABEL] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 },
5c766d64 101 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
ad6c8135 102 [IFA_FLAGS] = { .type = NLA_U32 },
5c753978
TG		 103};
104
40384999
ED		 105#define IN4_ADDR_HSIZE_SHIFT 8
106#define IN4_ADDR_HSIZE (1U << IN4_ADDR_HSIZE_SHIFT)
107
fd23c3b3 108static struct hlist_head inet_addr_lst[IN4_ADDR_HSIZE];
fd23c3b3 109
40384999 110static u32 inet_addr_hash(struct net *net, __be32 addr)
fd23c3b3 111{
40384999 112 u32 val = (__force u32) addr ^ net_hash_mix(net);
fd23c3b3 113
40384999 114 return hash_32(val, IN4_ADDR_HSIZE_SHIFT);
fd23c3b3
DM		 115}
116
117static void inet_hash_insert(struct net *net, struct in_ifaddr *ifa)
118{
40384999 119 u32 hash = inet_addr_hash(net, ifa->ifa_local);
fd23c3b3 120
32a4be48 121 ASSERT_RTNL();
fd23c3b3 122 hlist_add_head_rcu(&ifa->hash, &inet_addr_lst[hash]);
fd23c3b3
DM		 123}
124
125static void inet_hash_remove(struct in_ifaddr *ifa)
126{
32a4be48 127 ASSERT_RTNL();
fd23c3b3 128 hlist_del_init_rcu(&ifa->hash);
fd23c3b3
DM		 129}
130
9435eb1c
DM		 131/**
132 * __ip_dev_find - find the first device with a given source address.
133 * @net: the net namespace
134 * @addr: the source address
135 * @devref: if true, take a reference on the found device
136 *
137 * If a caller uses devref=false, it should be protected by RCU, or RTNL
138 */
139struct net_device *__ip_dev_find(struct net *net, __be32 addr, bool devref)
140{
40384999 141 u32 hash = inet_addr_hash(net, addr);
9435eb1c
DM		 142 struct net_device *result = NULL;
143 struct in_ifaddr *ifa;
9435eb1c
DM		 144
145 rcu_read_lock();
b67bfe0d 146 hlist_for_each_entry_rcu(ifa, &inet_addr_lst[hash], hash) {
e066008b 147 if (ifa->ifa_local == addr) {
40384999
ED		 148 struct net_device *dev = ifa->ifa_dev->dev;
149
150 if (!net_eq(dev_net(dev), net))
151 continue;
9435eb1c
DM		 152 result = dev;
153 break;
154 }
155 }
406b6f97
DM		 156 if (!result) {
157 struct flowi4 fl4 = { .daddr = addr };
158 struct fib_result res = { 0 };
159 struct fib_table *local;
160
161 /* Fallback to FIB local table so that communication
162 * over loopback subnets work.
163 */
164 local = fib_get_table(net, RT_TABLE_LOCAL);
165 if (local &&
166 !fib_table_lookup(local, &fl4, &res, FIB_LOOKUP_NOREF) &&
167 res.type == RTN_LOCAL)
168 result = FIB_RES_DEV(res);
169 }
9435eb1c
DM		 170 if (result && devref)
171 dev_hold(result);
172 rcu_read_unlock();
173 return result;
174}
175EXPORT_SYMBOL(__ip_dev_find);
176
d6062cbb 177static void rtmsg_ifa(int event, struct in_ifaddr *, struct nlmsghdr *, u32);
1da177e4 178
e041c683 179static BLOCKING_NOTIFIER_HEAD(inetaddr_chain);
1da177e4
LT		 180static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
181 int destroy);
182#ifdef CONFIG_SYSCTL
66f27a52 183static void devinet_sysctl_register(struct in_device *idev);
51602b2a
PE		 184static void devinet_sysctl_unregister(struct in_device *idev);
185#else
40384999 186static void devinet_sysctl_register(struct in_device *idev)
51602b2a
PE		 187{
188}
40384999 189static void devinet_sysctl_unregister(struct in_device *idev)
51602b2a
PE		 190{
191}
1da177e4
LT		 192#endif
193
194/* Locks all the inet devices. */
195
196static struct in_ifaddr *inet_alloc_ifa(void)
197{
93adcc80 198 return kzalloc(sizeof(struct in_ifaddr), GFP_KERNEL);
1da177e4
LT		 199}
200
201static void inet_rcu_free_ifa(struct rcu_head *head)
202{
203 struct in_ifaddr *ifa = container_of(head, struct in_ifaddr, rcu_head);
204 if (ifa->ifa_dev)
205 in_dev_put(ifa->ifa_dev);
206 kfree(ifa);
207}
208
40384999 209static void inet_free_ifa(struct in_ifaddr *ifa)
1da177e4
LT		 210{
211 call_rcu(&ifa->rcu_head, inet_rcu_free_ifa);
212}
213
214void in_dev_finish_destroy(struct in_device *idev)
215{
216 struct net_device *dev = idev->dev;
217
547b792c
IJ		 218 WARN_ON(idev->ifa_list);
219 WARN_ON(idev->mc_list);
e9897071 220 kfree(rcu_dereference_protected(idev->mc_hash, 1));
1da177e4 221#ifdef NET_REFCNT_DEBUG
91df42be 222 pr_debug("%s: %p=%s\n", __func__, idev, dev ? dev->name : "NIL");
1da177e4
LT		 223#endif
224 dev_put(dev);
225 if (!idev->dead)
9f9354b9
ED		 226 pr_err("Freeing alive in_device %p\n", idev);
227 else
1da177e4 228 kfree(idev);
1da177e4 229}
9f9354b9 230EXPORT_SYMBOL(in_dev_finish_destroy);
1da177e4 231
71e27da9 232static struct in_device *inetdev_init(struct net_device *dev)
1da177e4
LT		 233{
234 struct in_device *in_dev;
235
236 ASSERT_RTNL();
237
0da974f4 238 in_dev = kzalloc(sizeof(*in_dev), GFP_KERNEL);
1da177e4
LT		 239 if (!in_dev)
240 goto out;
c346dca1 241 memcpy(&in_dev->cnf, dev_net(dev)->ipv4.devconf_dflt,
9355bbd6 242 sizeof(in_dev->cnf));
1da177e4
LT		 243 in_dev->cnf.sysctl = NULL;
244 in_dev->dev = dev;
9f9354b9
ED		 245 in_dev->arp_parms = neigh_parms_alloc(dev, &arp_tbl);
246 if (!in_dev->arp_parms)
1da177e4 247 goto out_kfree;
0187bdfb
BH		 248 if (IPV4_DEVCONF(in_dev->cnf, FORWARDING))
249 dev_disable_lro(dev);
1da177e4
LT		 250 /* Reference in_dev->dev */
251 dev_hold(dev);
30c4cf57 252 /* Account for reference dev->ip_ptr (below) */
1da177e4 253 in_dev_hold(in_dev);
1da177e4 254
66f27a52 255 devinet_sysctl_register(in_dev);
1da177e4
LT		 256 ip_mc_init_dev(in_dev);
257 if (dev->flags & IFF_UP)
258 ip_mc_up(in_dev);
483479ec 259
30c4cf57 260 /* we can receive as soon as ip_ptr is set -- do this last */
cf778b00 261 rcu_assign_pointer(dev->ip_ptr, in_dev);
483479ec 262out:
1da177e4
LT		 263 return in_dev;
264out_kfree:
265 kfree(in_dev);
266 in_dev = NULL;
267 goto out;
268}
269
270static void in_dev_rcu_put(struct rcu_head *head)
271{
272 struct in_device *idev = container_of(head, struct in_device, rcu_head);
273 in_dev_put(idev);
274}
275
276static void inetdev_destroy(struct in_device *in_dev)
277{
278 struct in_ifaddr *ifa;
279 struct net_device *dev;
280
281 ASSERT_RTNL();
282
283 dev = in_dev->dev;
1da177e4
LT		 284
285 in_dev->dead = 1;
286
287 ip_mc_destroy_dev(in_dev);
288
289 while ((ifa = in_dev->ifa_list) != NULL) {
290 inet_del_ifa(in_dev, &in_dev->ifa_list, 0);
291 inet_free_ifa(ifa);
292 }
293
a9b3cd7f 294 RCU_INIT_POINTER(dev->ip_ptr, NULL);
1da177e4 295
51602b2a 296 devinet_sysctl_unregister(in_dev);
1da177e4
LT		 297 neigh_parms_release(&arp_tbl, in_dev->arp_parms);
298 arp_ifdown(dev);
299
300 call_rcu(&in_dev->rcu_head, in_dev_rcu_put);
301}
302
ff428d72 303int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b)
1da177e4
LT		 304{
305 rcu_read_lock();
306 for_primary_ifa(in_dev) {
307 if (inet_ifa_match(a, ifa)) {
308 if (!b || inet_ifa_match(b, ifa)) {
309 rcu_read_unlock();
310 return 1;
311 }
312 }
313 } endfor_ifa(in_dev);
314 rcu_read_unlock();
315 return 0;
316}
317
d6062cbb 318static void __inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
15e47304 319 int destroy, struct nlmsghdr *nlh, u32 portid)
1da177e4 320{
8f937c60 321 struct in_ifaddr *promote = NULL;
0ff60a45
JHS		 322 struct in_ifaddr *ifa, *ifa1 = *ifap;
323 struct in_ifaddr *last_prim = in_dev->ifa_list;
324 struct in_ifaddr *prev_prom = NULL;
325 int do_promote = IN_DEV_PROMOTE_SECONDARIES(in_dev);
1da177e4
LT		 326
327 ASSERT_RTNL();
328
e905a9ed 329 /* 1. Deleting primary ifaddr forces deletion all secondaries
8f937c60
HW		 330 * unless alias promotion is set
331 **/
1da177e4
LT		 332
333 if (!(ifa1->ifa_flags & IFA_F_SECONDARY)) {
1da177e4
LT		 334 struct in_ifaddr **ifap1 = &ifa1->ifa_next;
335
336 while ((ifa = *ifap1) != NULL) {
e905a9ed 337 if (!(ifa->ifa_flags & IFA_F_SECONDARY) &&
0ff60a45
JHS		 338 ifa1->ifa_scope <= ifa->ifa_scope)
339 last_prim = ifa;
340
1da177e4
LT		 341 if (!(ifa->ifa_flags & IFA_F_SECONDARY) ||
342 ifa1->ifa_mask != ifa->ifa_mask ||
343 !inet_ifa_match(ifa1->ifa_address, ifa)) {
344 ifap1 = &ifa->ifa_next;
0ff60a45 345 prev_prom = ifa;
1da177e4
LT		 346 continue;
347 }
348
0ff60a45 349 if (!do_promote) {
fd23c3b3 350 inet_hash_remove(ifa);
8f937c60 351 *ifap1 = ifa->ifa_next;
1da177e4 352
15e47304 353 rtmsg_ifa(RTM_DELADDR, ifa, nlh, portid);
e041c683
AS		 354 blocking_notifier_call_chain(&inetaddr_chain,
355 NETDEV_DOWN, ifa);
8f937c60
HW		 356 inet_free_ifa(ifa);
357 } else {
358 promote = ifa;
359 break;
360 }
1da177e4
LT		 361 }
362 }
363
2d230e2b
JA		 364 /* On promotion all secondaries from subnet are changing
365 * the primary IP, we must remove all their routes silently
366 * and later to add them back with new prefsrc. Do this
367 * while all addresses are on the device list.
368 */
369 for (ifa = promote; ifa; ifa = ifa->ifa_next) {
370 if (ifa1->ifa_mask == ifa->ifa_mask &&
371 inet_ifa_match(ifa1->ifa_address, ifa))
372 fib_del_ifaddr(ifa, ifa1);
373 }
374
1da177e4
LT		 375 /* 2. Unlink it */
376
377 *ifap = ifa1->ifa_next;
fd23c3b3 378 inet_hash_remove(ifa1);
1da177e4
LT		 379
380 /* 3. Announce address deletion */
381
382 /* Send message first, then call notifier.
383 At first sight, FIB update triggered by notifier
384 will refer to already deleted ifaddr, that could confuse
385 netlink listeners. It is not true: look, gated sees
386 that route deleted and if it still thinks that ifaddr
387 is valid, it will try to restore deleted routes... Grr.
388 So that, this order is correct.
389 */
15e47304 390 rtmsg_ifa(RTM_DELADDR, ifa1, nlh, portid);
e041c683 391 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa1);
1da177e4 392
0ff60a45 393 if (promote) {
04024b93 394 struct in_ifaddr *next_sec = promote->ifa_next;
0ff60a45
JHS		 395
396 if (prev_prom) {
397 prev_prom->ifa_next = promote->ifa_next;
398 promote->ifa_next = last_prim->ifa_next;
399 last_prim->ifa_next = promote;
400 }
8f937c60 401
8f937c60 402 promote->ifa_flags &= ~IFA_F_SECONDARY;
15e47304 403 rtmsg_ifa(RTM_NEWADDR, promote, nlh, portid);
e041c683
AS		 404 blocking_notifier_call_chain(&inetaddr_chain,
405 NETDEV_UP, promote);
04024b93 406 for (ifa = next_sec; ifa; ifa = ifa->ifa_next) {
0ff60a45
JHS		 407 if (ifa1->ifa_mask != ifa->ifa_mask ||
408 !inet_ifa_match(ifa1->ifa_address, ifa))
409 continue;
410 fib_add_ifaddr(ifa);
411 }
412
413 }
6363097c 414 if (destroy)
0ff60a45 415 inet_free_ifa(ifa1);
1da177e4
LT		 416}
417
d6062cbb
TG		 418static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
419 int destroy)
420{
421 __inet_del_ifa(in_dev, ifap, destroy, NULL, 0);
422}
423
5c766d64
JP		 424static void check_lifetime(struct work_struct *work);
425
426static DECLARE_DELAYED_WORK(check_lifetime_work, check_lifetime);
427
d6062cbb 428static int __inet_insert_ifa(struct in_ifaddr *ifa, struct nlmsghdr *nlh,
15e47304 429 u32 portid)
1da177e4
LT		 430{
431 struct in_device *in_dev = ifa->ifa_dev;
432 struct in_ifaddr *ifa1, **ifap, **last_primary;
433
434 ASSERT_RTNL();
435
436 if (!ifa->ifa_local) {
437 inet_free_ifa(ifa);
438 return 0;
439 }
440
441 ifa->ifa_flags &= ~IFA_F_SECONDARY;
442 last_primary = &in_dev->ifa_list;
443
444 for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL;
445 ifap = &ifa1->ifa_next) {
446 if (!(ifa1->ifa_flags & IFA_F_SECONDARY) &&
447 ifa->ifa_scope <= ifa1->ifa_scope)
448 last_primary = &ifa1->ifa_next;
449 if (ifa1->ifa_mask == ifa->ifa_mask &&
450 inet_ifa_match(ifa1->ifa_address, ifa)) {
451 if (ifa1->ifa_local == ifa->ifa_local) {
452 inet_free_ifa(ifa);
453 return -EEXIST;
454 }
455 if (ifa1->ifa_scope != ifa->ifa_scope) {
456 inet_free_ifa(ifa);
457 return -EINVAL;
458 }
459 ifa->ifa_flags |= IFA_F_SECONDARY;
460 }
461 }
462
463 if (!(ifa->ifa_flags & IFA_F_SECONDARY)) {
63862b5b 464 prandom_seed((__force u32) ifa->ifa_local);
1da177e4
LT		 465 ifap = last_primary;
466 }
467
468 ifa->ifa_next = *ifap;
469 *ifap = ifa;
470
fd23c3b3
DM		 471 inet_hash_insert(dev_net(in_dev->dev), ifa);
472
5c766d64 473 cancel_delayed_work(&check_lifetime_work);
906e073f 474 queue_delayed_work(system_power_efficient_wq, &check_lifetime_work, 0);
5c766d64 475
1da177e4
LT		 476 /* Send message first, then call notifier.
477 Notifier will trigger FIB update, so that
478 listeners of netlink will know about new ifaddr */
15e47304 479 rtmsg_ifa(RTM_NEWADDR, ifa, nlh, portid);
e041c683 480 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa);
1da177e4
LT		 481
482 return 0;
483}
484
d6062cbb
TG		 485static int inet_insert_ifa(struct in_ifaddr *ifa)
486{
487 return __inet_insert_ifa(ifa, NULL, 0);
488}
489
1da177e4
LT		 490static int inet_set_ifa(struct net_device *dev, struct in_ifaddr *ifa)
491{
e5ed6399 492 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1da177e4
LT		 493
494 ASSERT_RTNL();
495
496 if (!in_dev) {
71e27da9
HX		 497 inet_free_ifa(ifa);
498 return -ENOBUFS;
1da177e4 499 }
71e27da9 500 ipv4_devconf_setall(in_dev);
1d4c8c29 501 neigh_parms_data_state_setall(in_dev->arp_parms);
1da177e4 502 if (ifa->ifa_dev != in_dev) {
547b792c 503 WARN_ON(ifa->ifa_dev);
1da177e4
LT		 504 in_dev_hold(in_dev);
505 ifa->ifa_dev = in_dev;
506 }
f97c1e0c 507 if (ipv4_is_loopback(ifa->ifa_local))
1da177e4
LT		 508 ifa->ifa_scope = RT_SCOPE_HOST;
509 return inet_insert_ifa(ifa);
510}
511
8723e1b4
ED		 512/* Caller must hold RCU or RTNL :
513 * We dont take a reference on found in_device
514 */
7fee0ca2 515struct in_device *inetdev_by_index(struct net *net, int ifindex)
1da177e4
LT		 516{
517 struct net_device *dev;
518 struct in_device *in_dev = NULL;
c148fc2e
ED		 519
520 rcu_read_lock();
521 dev = dev_get_by_index_rcu(net, ifindex);
1da177e4 522 if (dev)
8723e1b4 523 in_dev = rcu_dereference_rtnl(dev->ip_ptr);
c148fc2e 524 rcu_read_unlock();
1da177e4
LT		 525 return in_dev;
526}
9f9354b9 527EXPORT_SYMBOL(inetdev_by_index);
1da177e4
LT		 528
529/* Called only from RTNL semaphored context. No locks. */
530
60cad5da
AV		 531struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix,
532 __be32 mask)
1da177e4
LT		 533{
534 ASSERT_RTNL();
535
536 for_primary_ifa(in_dev) {
537 if (ifa->ifa_mask == mask && inet_ifa_match(prefix, ifa))
538 return ifa;
539 } endfor_ifa(in_dev);
540 return NULL;
541}
542
661d2967 543static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 544{
3b1e0a65 545 struct net *net = sock_net(skb->sk);
dfdd5fd4 546 struct nlattr *tb[IFA_MAX+1];
1da177e4 547 struct in_device *in_dev;
dfdd5fd4 548 struct ifaddrmsg *ifm;
1da177e4 549 struct in_ifaddr *ifa, **ifap;
dfdd5fd4 550 int err = -EINVAL;
1da177e4
LT		 551
552 ASSERT_RTNL();
553
dfdd5fd4
TG		 554 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy);
555 if (err < 0)
556 goto errout;
557
558 ifm = nlmsg_data(nlh);
7fee0ca2 559 in_dev = inetdev_by_index(net, ifm->ifa_index);
dfdd5fd4
TG		 560 if (in_dev == NULL) {
561 err = -ENODEV;
562 goto errout;
563 }
564
1da177e4
LT		 565 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
566 ifap = &ifa->ifa_next) {
dfdd5fd4 567 if (tb[IFA_LOCAL] &&
a7a628c4 568 ifa->ifa_local != nla_get_be32(tb[IFA_LOCAL]))
dfdd5fd4
TG		 569 continue;
570
571 if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label))
1da177e4 572 continue;
dfdd5fd4
TG		 573
574 if (tb[IFA_ADDRESS] &&
575 (ifm->ifa_prefixlen != ifa->ifa_prefixlen ||
a7a628c4 576 !inet_ifa_match(nla_get_be32(tb[IFA_ADDRESS]), ifa)))
dfdd5fd4
TG		 577 continue;
578
15e47304 579 __inet_del_ifa(in_dev, ifap, 1, nlh, NETLINK_CB(skb).portid);
1da177e4
LT		 580 return 0;
581 }
dfdd5fd4
TG		 582
583 err = -EADDRNOTAVAIL;
584errout:
585 return err;
1da177e4
LT		 586}
587
5c766d64
JP		 588#define INFINITY_LIFE_TIME 0xFFFFFFFF
589
590static void check_lifetime(struct work_struct *work)
591{
592 unsigned long now, next, next_sec, next_sched;
593 struct in_ifaddr *ifa;
c988d1e8 594 struct hlist_node *n;
5c766d64
JP		 595 int i;
596
597 now = jiffies;
598 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
599
5c766d64 600 for (i = 0; i < IN4_ADDR_HSIZE; i++) {
c988d1e8
JP		 601 bool change_needed = false;
602
603 rcu_read_lock();
b67bfe0d 604 hlist_for_each_entry_rcu(ifa, &inet_addr_lst[i], hash) {
5c766d64
JP		 605 unsigned long age;
606
607 if (ifa->ifa_flags & IFA_F_PERMANENT)
608 continue;
609
610 /* We try to batch several events at once. */
611 age = (now - ifa->ifa_tstamp +
612 ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
613
614 if (ifa->ifa_valid_lft != INFINITY_LIFE_TIME &&
615 age >= ifa->ifa_valid_lft) {
c988d1e8 616 change_needed = true;
5c766d64
JP		 617 } else if (ifa->ifa_preferred_lft ==
618 INFINITY_LIFE_TIME) {
619 continue;
620 } else if (age >= ifa->ifa_preferred_lft) {
621 if (time_before(ifa->ifa_tstamp +
622 ifa->ifa_valid_lft * HZ, next))
623 next = ifa->ifa_tstamp +
624 ifa->ifa_valid_lft * HZ;
625
c988d1e8
JP		 626 if (!(ifa->ifa_flags & IFA_F_DEPRECATED))
627 change_needed = true;
5c766d64
JP		 628 } else if (time_before(ifa->ifa_tstamp +
629 ifa->ifa_preferred_lft * HZ,
630 next)) {
631 next = ifa->ifa_tstamp +
632 ifa->ifa_preferred_lft * HZ;
633 }
634 }
c988d1e8
JP		 635 rcu_read_unlock();
636 if (!change_needed)
637 continue;
638 rtnl_lock();
639 hlist_for_each_entry_safe(ifa, n, &inet_addr_lst[i], hash) {
640 unsigned long age;
641
642 if (ifa->ifa_flags & IFA_F_PERMANENT)
643 continue;
644
645 /* We try to batch several events at once. */
646 age = (now - ifa->ifa_tstamp +
647 ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
648
649 if (ifa->ifa_valid_lft != INFINITY_LIFE_TIME &&
650 age >= ifa->ifa_valid_lft) {
651 struct in_ifaddr **ifap;
652
653 for (ifap = &ifa->ifa_dev->ifa_list;
654 *ifap != NULL; ifap = &(*ifap)->ifa_next) {
655 if (*ifap == ifa) {
656 inet_del_ifa(ifa->ifa_dev,
657 ifap, 1);
658 break;
659 }
660 }
661 } else if (ifa->ifa_preferred_lft !=
662 INFINITY_LIFE_TIME &&
663 age >= ifa->ifa_preferred_lft &&
664 !(ifa->ifa_flags & IFA_F_DEPRECATED)) {
665 ifa->ifa_flags |= IFA_F_DEPRECATED;
666 rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0);
667 }
668 }
669 rtnl_unlock();
5c766d64 670 }
5c766d64
JP		 671
672 next_sec = round_jiffies_up(next);
673 next_sched = next;
674
675 /* If rounded timeout is accurate enough, accept it. */
676 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
677 next_sched = next_sec;
678
679 now = jiffies;
680 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
681 if (time_before(next_sched, now + ADDRCONF_TIMER_FUZZ_MAX))
682 next_sched = now + ADDRCONF_TIMER_FUZZ_MAX;
683
906e073f 684 queue_delayed_work(system_power_efficient_wq, &check_lifetime_work,
685 next_sched - now);
5c766d64
JP		 686}
687
688static void set_ifa_lifetime(struct in_ifaddr *ifa, __u32 valid_lft,
689 __u32 prefered_lft)
690{
691 unsigned long timeout;
692
693 ifa->ifa_flags &= ~(IFA_F_PERMANENT | IFA_F_DEPRECATED);
694
695 timeout = addrconf_timeout_fixup(valid_lft, HZ);
696 if (addrconf_finite_timeout(timeout))
697 ifa->ifa_valid_lft = timeout;
698 else
699 ifa->ifa_flags |= IFA_F_PERMANENT;
700
701 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
702 if (addrconf_finite_timeout(timeout)) {
703 if (timeout == 0)
704 ifa->ifa_flags |= IFA_F_DEPRECATED;
705 ifa->ifa_preferred_lft = timeout;
706 }
707 ifa->ifa_tstamp = jiffies;
708 if (!ifa->ifa_cstamp)
709 ifa->ifa_cstamp = ifa->ifa_tstamp;
710}
711
712static struct in_ifaddr *rtm_to_ifaddr(struct net *net, struct nlmsghdr *nlh,
713 __u32 *pvalid_lft, __u32 *pprefered_lft)
1da177e4 714{
5c753978
TG		 715 struct nlattr *tb[IFA_MAX+1];
716 struct in_ifaddr *ifa;
717 struct ifaddrmsg *ifm;
1da177e4
LT		 718 struct net_device *dev;
719 struct in_device *in_dev;
7b218574 720 int err;
1da177e4 721
5c753978
TG		 722 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy);
723 if (err < 0)
724 goto errout;
1da177e4 725
5c753978 726 ifm = nlmsg_data(nlh);
7b218574
DL		 727 err = -EINVAL;
728 if (ifm->ifa_prefixlen > 32 || tb[IFA_LOCAL] == NULL)
5c753978 729 goto errout;
1da177e4 730
4b8aa9ab 731 dev = __dev_get_by_index(net, ifm->ifa_index);
7b218574
DL		 732 err = -ENODEV;
733 if (dev == NULL)
5c753978 734 goto errout;
1da177e4 735
5c753978 736 in_dev = __in_dev_get_rtnl(dev);
7b218574
DL		 737 err = -ENOBUFS;
738 if (in_dev == NULL)
71e27da9 739 goto errout;
1da177e4 740
5c753978 741 ifa = inet_alloc_ifa();
7b218574 742 if (ifa == NULL)
5c753978
TG		 743 /*
744 * A potential indev allocation can be left alive, it stays
745 * assigned to its device and is destroy with it.
746 */
5c753978 747 goto errout;
5c753978 748
a4e65d36 749 ipv4_devconf_setall(in_dev);
1d4c8c29 750 neigh_parms_data_state_setall(in_dev->arp_parms);
5c753978
TG		 751 in_dev_hold(in_dev);
752
753 if (tb[IFA_ADDRESS] == NULL)
754 tb[IFA_ADDRESS] = tb[IFA_LOCAL];
1da177e4 755
fd23c3b3 756 INIT_HLIST_NODE(&ifa->hash);
1da177e4
LT		 757 ifa->ifa_prefixlen = ifm->ifa_prefixlen;
758 ifa->ifa_mask = inet_make_mask(ifm->ifa_prefixlen);
ad6c8135
JP		 759 ifa->ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) :
760 ifm->ifa_flags;
1da177e4 761 ifa->ifa_scope = ifm->ifa_scope;
5c753978
TG		 762 ifa->ifa_dev = in_dev;
763
a7a628c4
AV		 764 ifa->ifa_local = nla_get_be32(tb[IFA_LOCAL]);
765 ifa->ifa_address = nla_get_be32(tb[IFA_ADDRESS]);
5c753978
TG		 766
767 if (tb[IFA_BROADCAST])
a7a628c4 768 ifa->ifa_broadcast = nla_get_be32(tb[IFA_BROADCAST]);
5c753978 769
5c753978
TG		 770 if (tb[IFA_LABEL])
771 nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ);
1da177e4
LT		 772 else
773 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
774
5c766d64
JP		 775 if (tb[IFA_CACHEINFO]) {
776 struct ifa_cacheinfo *ci;
777
778 ci = nla_data(tb[IFA_CACHEINFO]);
779 if (!ci->ifa_valid || ci->ifa_prefered > ci->ifa_valid) {
780 err = -EINVAL;
446266b0 781 goto errout_free;
5c766d64
JP		 782 }
783 *pvalid_lft = ci->ifa_valid;
784 *pprefered_lft = ci->ifa_prefered;
785 }
786
5c753978
TG		 787 return ifa;
788
446266b0
DB		 789errout_free:
790 inet_free_ifa(ifa);
5c753978
TG		 791errout:
792 return ERR_PTR(err);
793}
794
5c766d64
JP		 795static struct in_ifaddr *find_matching_ifa(struct in_ifaddr *ifa)
796{
797 struct in_device *in_dev = ifa->ifa_dev;
798 struct in_ifaddr *ifa1, **ifap;
799
800 if (!ifa->ifa_local)
801 return NULL;
802
803 for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL;
804 ifap = &ifa1->ifa_next) {
805 if (ifa1->ifa_mask == ifa->ifa_mask &&
806 inet_ifa_match(ifa1->ifa_address, ifa) &&
807 ifa1->ifa_local == ifa->ifa_local)
808 return ifa1;
809 }
810 return NULL;
811}
812
661d2967 813static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
5c753978 814{
3b1e0a65 815 struct net *net = sock_net(skb->sk);
5c753978 816 struct in_ifaddr *ifa;
5c766d64
JP		 817 struct in_ifaddr *ifa_existing;
818 __u32 valid_lft = INFINITY_LIFE_TIME;
819 __u32 prefered_lft = INFINITY_LIFE_TIME;
5c753978
TG		 820
821 ASSERT_RTNL();
822
5c766d64 823 ifa = rtm_to_ifaddr(net, nlh, &valid_lft, &prefered_lft);
5c753978
TG		 824 if (IS_ERR(ifa))
825 return PTR_ERR(ifa);
826
5c766d64
JP		 827 ifa_existing = find_matching_ifa(ifa);
828 if (!ifa_existing) {
829 /* It would be best to check for !NLM_F_CREATE here but
614d056c 830 * userspace already relies on not having to provide this.
5c766d64
JP		 831 */
832 set_ifa_lifetime(ifa, valid_lft, prefered_lft);
833 return __inet_insert_ifa(ifa, nlh, NETLINK_CB(skb).portid);
834 } else {
835 inet_free_ifa(ifa);
836
837 if (nlh->nlmsg_flags & NLM_F_EXCL ||
838 !(nlh->nlmsg_flags & NLM_F_REPLACE))
839 return -EEXIST;
34e2ed34
JP		 840 ifa = ifa_existing;
841 set_ifa_lifetime(ifa, valid_lft, prefered_lft);
05a324b9 842 cancel_delayed_work(&check_lifetime_work);
906e073f 843 queue_delayed_work(system_power_efficient_wq,
844 &check_lifetime_work, 0);
34e2ed34
JP		 845 rtmsg_ifa(RTM_NEWADDR, ifa, nlh, NETLINK_CB(skb).portid);
846 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa);
5c766d64
JP		 847 }
848 return 0;
1da177e4
LT		 849}
850
851/*
852 * Determine a default network mask, based on the IP address.
853 */
854
40384999 855static int inet_abc_len(__be32 addr)
1da177e4
LT		 856{
857 int rc = -1; /* Something else, probably a multicast. */
858
f97c1e0c 859 if (ipv4_is_zeronet(addr))
e905a9ed 860 rc = 0;
1da177e4 861 else {
714e85be 862 __u32 haddr = ntohl(addr);
1da177e4 863
714e85be 864 if (IN_CLASSA(haddr))
1da177e4 865 rc = 8;
714e85be 866 else if (IN_CLASSB(haddr))
1da177e4 867 rc = 16;
714e85be 868 else if (IN_CLASSC(haddr))
1da177e4
LT		 869 rc = 24;
870 }
871
e905a9ed 872 return rc;
1da177e4
LT		 873}
874
875
e5b13cb1 876int devinet_ioctl(struct net *net, unsigned int cmd, void __user *arg)
1da177e4
LT		 877{
878 struct ifreq ifr;
879 struct sockaddr_in sin_orig;
880 struct sockaddr_in *sin = (struct sockaddr_in *)&ifr.ifr_addr;
881 struct in_device *in_dev;
882 struct in_ifaddr **ifap = NULL;
883 struct in_ifaddr *ifa = NULL;
884 struct net_device *dev;
885 char *colon;
886 int ret = -EFAULT;
887 int tryaddrmatch = 0;
888
889 /*
890 * Fetch the caller's info block into kernel space
891 */
892
893 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
894 goto out;
895 ifr.ifr_name[IFNAMSIZ - 1] = 0;
896
897 /* save original address for comparison */
898 memcpy(&sin_orig, sin, sizeof(*sin));
899
900 colon = strchr(ifr.ifr_name, ':');
901 if (colon)
902 *colon = 0;
903
e5b13cb1 904 dev_load(net, ifr.ifr_name);
1da177e4 905
132adf54 906 switch (cmd) {
1da177e4
LT		 907 case SIOCGIFADDR: /* Get interface address */
908 case SIOCGIFBRDADDR: /* Get the broadcast address */
909 case SIOCGIFDSTADDR: /* Get the destination address */
910 case SIOCGIFNETMASK: /* Get the netmask for the interface */
911 /* Note that these ioctls will not sleep,
912 so that we do not impose a lock.
913 One day we will be forced to put shlock here (I mean SMP)
914 */
915 tryaddrmatch = (sin_orig.sin_family == AF_INET);
916 memset(sin, 0, sizeof(*sin));
917 sin->sin_family = AF_INET;
918 break;
919
920 case SIOCSIFFLAGS:
bf5b30b8 921 ret = -EPERM;
52e804c6 922 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 923 goto out;
924 break;
925 case SIOCSIFADDR: /* Set interface address (and family) */
926 case SIOCSIFBRDADDR: /* Set the broadcast address */
927 case SIOCSIFDSTADDR: /* Set the destination address */
928 case SIOCSIFNETMASK: /* Set the netmask for the interface */
bf5b30b8 929 ret = -EPERM;
52e804c6 930 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 931 goto out;
932 ret = -EINVAL;
933 if (sin->sin_family != AF_INET)
934 goto out;
935 break;
936 default:
937 ret = -EINVAL;
938 goto out;
939 }
940
941 rtnl_lock();
942
943 ret = -ENODEV;
9f9354b9
ED		 944 dev = __dev_get_by_name(net, ifr.ifr_name);
945 if (!dev)
1da177e4
LT		 946 goto done;
947
948 if (colon)
949 *colon = ':';
950
9f9354b9
ED		 951 in_dev = __in_dev_get_rtnl(dev);
952 if (in_dev) {
1da177e4
LT		 953 if (tryaddrmatch) {
954 /* Matthias Andree */
955 /* compare label and address (4.4BSD style) */
956 /* note: we only do this for a limited set of ioctls
957 and only if the original address family was AF_INET.
958 This is checked above. */
959 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
960 ifap = &ifa->ifa_next) {
961 if (!strcmp(ifr.ifr_name, ifa->ifa_label) &&
962 sin_orig.sin_addr.s_addr ==
6c91afe1 963 ifa->ifa_local) {
1da177e4
LT		 964 break; /* found */
965 }
966 }
967 }
968 /* we didn't get a match, maybe the application is
969 4.3BSD-style and passed in junk so we fall back to
970 comparing just the label */
971 if (!ifa) {
972 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
973 ifap = &ifa->ifa_next)
974 if (!strcmp(ifr.ifr_name, ifa->ifa_label))
975 break;
976 }
977 }
978
979 ret = -EADDRNOTAVAIL;
980 if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS)
981 goto done;
982
132adf54 983 switch (cmd) {
1da177e4
LT		 984 case SIOCGIFADDR: /* Get interface address */
985 sin->sin_addr.s_addr = ifa->ifa_local;
986 goto rarok;
987
988 case SIOCGIFBRDADDR: /* Get the broadcast address */
989 sin->sin_addr.s_addr = ifa->ifa_broadcast;
990 goto rarok;
991
992 case SIOCGIFDSTADDR: /* Get the destination address */
993 sin->sin_addr.s_addr = ifa->ifa_address;
994 goto rarok;
995
996 case SIOCGIFNETMASK: /* Get the netmask for the interface */
997 sin->sin_addr.s_addr = ifa->ifa_mask;
998 goto rarok;
999
1000 case SIOCSIFFLAGS:
1001 if (colon) {
1002 ret = -EADDRNOTAVAIL;
1003 if (!ifa)
1004 break;
1005 ret = 0;
1006 if (!(ifr.ifr_flags & IFF_UP))
1007 inet_del_ifa(in_dev, ifap, 1);
1008 break;
1009 }
1010 ret = dev_change_flags(dev, ifr.ifr_flags);
1011 break;
1012
1013 case SIOCSIFADDR: /* Set interface address (and family) */
1014 ret = -EINVAL;
1015 if (inet_abc_len(sin->sin_addr.s_addr) < 0)
1016 break;
1017
1018 if (!ifa) {
1019 ret = -ENOBUFS;
9f9354b9
ED		 1020 ifa = inet_alloc_ifa();
1021 if (!ifa)
1da177e4 1022 break;
c7e2e1d7 1023 INIT_HLIST_NODE(&ifa->hash);
1da177e4
LT		 1024 if (colon)
1025 memcpy(ifa->ifa_label, ifr.ifr_name, IFNAMSIZ);
1026 else
1027 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1028 } else {
1029 ret = 0;
1030 if (ifa->ifa_local == sin->sin_addr.s_addr)
1031 break;
1032 inet_del_ifa(in_dev, ifap, 0);
1033 ifa->ifa_broadcast = 0;
148f9729 1034 ifa->ifa_scope = 0;
1da177e4
LT		 1035 }
1036
1037 ifa->ifa_address = ifa->ifa_local = sin->sin_addr.s_addr;
1038
1039 if (!(dev->flags & IFF_POINTOPOINT)) {
1040 ifa->ifa_prefixlen = inet_abc_len(ifa->ifa_address);
1041 ifa->ifa_mask = inet_make_mask(ifa->ifa_prefixlen);
1042 if ((dev->flags & IFF_BROADCAST) &&
1043 ifa->ifa_prefixlen < 31)
1044 ifa->ifa_broadcast = ifa->ifa_address |
1045 ~ifa->ifa_mask;
1046 } else {
1047 ifa->ifa_prefixlen = 32;
1048 ifa->ifa_mask = inet_make_mask(32);
1049 }
5c766d64 1050 set_ifa_lifetime(ifa, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 1051 ret = inet_set_ifa(dev, ifa);
1052 break;
1053
1054 case SIOCSIFBRDADDR: /* Set the broadcast address */
1055 ret = 0;
1056 if (ifa->ifa_broadcast != sin->sin_addr.s_addr) {
1057 inet_del_ifa(in_dev, ifap, 0);
1058 ifa->ifa_broadcast = sin->sin_addr.s_addr;
1059 inet_insert_ifa(ifa);
1060 }
1061 break;
1062
1063 case SIOCSIFDSTADDR: /* Set the destination address */
1064 ret = 0;
1065 if (ifa->ifa_address == sin->sin_addr.s_addr)
1066 break;
1067 ret = -EINVAL;
1068 if (inet_abc_len(sin->sin_addr.s_addr) < 0)
1069 break;
1070 ret = 0;
1071 inet_del_ifa(in_dev, ifap, 0);
1072 ifa->ifa_address = sin->sin_addr.s_addr;
1073 inet_insert_ifa(ifa);
1074 break;
1075
1076 case SIOCSIFNETMASK: /* Set the netmask for the interface */
1077
1078 /*
1079 * The mask we set must be legal.
1080 */
1081 ret = -EINVAL;
1082 if (bad_mask(sin->sin_addr.s_addr, 0))
1083 break;
1084 ret = 0;
1085 if (ifa->ifa_mask != sin->sin_addr.s_addr) {
a144ea4b 1086 __be32 old_mask = ifa->ifa_mask;
1da177e4
LT		 1087 inet_del_ifa(in_dev, ifap, 0);
1088 ifa->ifa_mask = sin->sin_addr.s_addr;
1089 ifa->ifa_prefixlen = inet_mask_len(ifa->ifa_mask);
1090
1091 /* See if current broadcast address matches
1092 * with current netmask, then recalculate
1093 * the broadcast address. Otherwise it's a
1094 * funny address, so don't touch it since
1095 * the user seems to know what (s)he's doing...
1096 */
1097 if ((dev->flags & IFF_BROADCAST) &&
1098 (ifa->ifa_prefixlen < 31) &&
1099 (ifa->ifa_broadcast ==
dcab5e1e 1100 (ifa->ifa_local|~old_mask))) {
1da177e4
LT		 1101 ifa->ifa_broadcast = (ifa->ifa_local |
1102 ~sin->sin_addr.s_addr);
1103 }
1104 inet_insert_ifa(ifa);
1105 }
1106 break;
1107 }
1108done:
1109 rtnl_unlock();
1110out:
1111 return ret;
1112rarok:
1113 rtnl_unlock();
1114 ret = copy_to_user(arg, &ifr, sizeof(struct ifreq)) ? -EFAULT : 0;
1115 goto out;
1116}
1117
1118static int inet_gifconf(struct net_device *dev, char __user *buf, int len)
1119{
e5ed6399 1120 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1da177e4
LT		 1121 struct in_ifaddr *ifa;
1122 struct ifreq ifr;
1123 int done = 0;
1124
9f9354b9 1125 if (!in_dev)
1da177e4
LT		 1126 goto out;
1127
9f9354b9 1128 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1da177e4
LT		 1129 if (!buf) {
1130 done += sizeof(ifr);
1131 continue;
1132 }
1133 if (len < (int) sizeof(ifr))
1134 break;
1135 memset(&ifr, 0, sizeof(struct ifreq));
4299c8a9 1136 strcpy(ifr.ifr_name, ifa->ifa_label);
1da177e4
LT		 1137
1138 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_family = AF_INET;
1139 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_addr.s_addr =
1140 ifa->ifa_local;
1141
1142 if (copy_to_user(buf, &ifr, sizeof(struct ifreq))) {
1143 done = -EFAULT;
1144 break;
1145 }
1146 buf += sizeof(struct ifreq);
1147 len -= sizeof(struct ifreq);
1148 done += sizeof(struct ifreq);
1149 }
1150out:
1151 return done;
1152}
1153
a61ced5d 1154__be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope)
1da177e4 1155{
a61ced5d 1156 __be32 addr = 0;
1da177e4 1157 struct in_device *in_dev;
c346dca1 1158 struct net *net = dev_net(dev);
1da177e4
LT		 1159
1160 rcu_read_lock();
e5ed6399 1161 in_dev = __in_dev_get_rcu(dev);
1da177e4
LT		 1162 if (!in_dev)
1163 goto no_in_dev;
1164
1165 for_primary_ifa(in_dev) {
1166 if (ifa->ifa_scope > scope)
1167 continue;
1168 if (!dst || inet_ifa_match(dst, ifa)) {
1169 addr = ifa->ifa_local;
1170 break;
1171 }
1172 if (!addr)
1173 addr = ifa->ifa_local;
1174 } endfor_ifa(in_dev);
1da177e4
LT		 1175
1176 if (addr)
c6d14c84 1177 goto out_unlock;
9f9354b9 1178no_in_dev:
1da177e4
LT		 1179
1180 /* Not loopback addresses on loopback should be preferred
1181 in this case. It is importnat that lo is the first interface
1182 in dev_base list.
1183 */
c6d14c84 1184 for_each_netdev_rcu(net, dev) {
9f9354b9
ED		 1185 in_dev = __in_dev_get_rcu(dev);
1186 if (!in_dev)
1da177e4
LT		 1187 continue;
1188
1189 for_primary_ifa(in_dev) {
1190 if (ifa->ifa_scope != RT_SCOPE_LINK &&
1191 ifa->ifa_scope <= scope) {
1192 addr = ifa->ifa_local;
c6d14c84 1193 goto out_unlock;
1da177e4
LT		 1194 }
1195 } endfor_ifa(in_dev);
1196 }
c6d14c84 1197out_unlock:
1da177e4 1198 rcu_read_unlock();
1da177e4
LT		 1199 return addr;
1200}
9f9354b9 1201EXPORT_SYMBOL(inet_select_addr);
1da177e4 1202
60cad5da
AV		 1203static __be32 confirm_addr_indev(struct in_device *in_dev, __be32 dst,
1204 __be32 local, int scope)
1da177e4
LT		 1205{
1206 int same = 0;
a144ea4b 1207 __be32 addr = 0;
1da177e4
LT		 1208
1209 for_ifa(in_dev) {
1210 if (!addr &&
1211 (local == ifa->ifa_local || !local) &&
1212 ifa->ifa_scope <= scope) {
1213 addr = ifa->ifa_local;
1214 if (same)
1215 break;
1216 }
1217 if (!same) {
1218 same = (!local || inet_ifa_match(local, ifa)) &&
1219 (!dst || inet_ifa_match(dst, ifa));
1220 if (same && addr) {
1221 if (local || !dst)
1222 break;
1223 /* Is the selected addr into dst subnet? */
1224 if (inet_ifa_match(addr, ifa))
1225 break;
1226 /* No, then can we use new local src? */
1227 if (ifa->ifa_scope <= scope) {
1228 addr = ifa->ifa_local;
1229 break;
1230 }
1231 /* search for large dst subnet for addr */
1232 same = 0;
1233 }
1234 }
1235 } endfor_ifa(in_dev);
1236
9f9354b9 1237 return same ? addr : 0;
1da177e4
LT		 1238}
1239
1240/*
1241 * Confirm that local IP address exists using wildcards:
b601fa19
ND		 1242 * - net: netns to check, cannot be NULL
1243 * - in_dev: only on this interface, NULL=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 */
b601fa19 1248__be32 inet_confirm_addr(struct net *net, struct in_device *in_dev,
9bd85e32 1249 __be32 dst, __be32 local, int scope)
1da177e4 1250{
60cad5da 1251 __be32 addr = 0;
9bd85e32 1252 struct net_device *dev;
1da177e4 1253
b601fa19 1254 if (in_dev != NULL)
9bd85e32 1255 return confirm_addr_indev(in_dev, dst, local, scope);
1da177e4 1256
1da177e4 1257 rcu_read_lock();
c6d14c84 1258 for_each_netdev_rcu(net, dev) {
9f9354b9
ED		 1259 in_dev = __in_dev_get_rcu(dev);
1260 if (in_dev) {
1da177e4
LT		 1261 addr = confirm_addr_indev(in_dev, dst, local, scope);
1262 if (addr)
1263 break;
1264 }
1265 }
1266 rcu_read_unlock();
1da177e4
LT		 1267
1268 return addr;
1269}
eaddcd76 1270EXPORT_SYMBOL(inet_confirm_addr);
1da177e4
LT		 1271
1272/*
1273 * Device notifier
1274 */
1275
1276int register_inetaddr_notifier(struct notifier_block *nb)
1277{
e041c683 1278 return blocking_notifier_chain_register(&inetaddr_chain, nb);
1da177e4 1279}
9f9354b9 1280EXPORT_SYMBOL(register_inetaddr_notifier);
1da177e4
LT		 1281
1282int unregister_inetaddr_notifier(struct notifier_block *nb)
1283{
e041c683 1284 return blocking_notifier_chain_unregister(&inetaddr_chain, nb);
1da177e4 1285}
9f9354b9 1286EXPORT_SYMBOL(unregister_inetaddr_notifier);
1da177e4 1287
9f9354b9
ED		 1288/* Rename ifa_labels for a device name change. Make some effort to preserve
1289 * existing alias numbering and to create unique labels if possible.
1da177e4
LT		 1290*/
1291static void inetdev_changename(struct net_device *dev, struct in_device *in_dev)
e905a9ed 1292{
1da177e4
LT		 1293 struct in_ifaddr *ifa;
1294 int named = 0;
1295
e905a9ed
YH		 1296 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1297 char old[IFNAMSIZ], *dot;
1da177e4
LT		 1298
1299 memcpy(old, ifa->ifa_label, IFNAMSIZ);
e905a9ed 1300 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1da177e4 1301 if (named++ == 0)
573bf470 1302 goto skip;
44344b2a 1303 dot = strchr(old, ':');
e905a9ed
YH		 1304 if (dot == NULL) {
1305 sprintf(old, ":%d", named);
1da177e4
LT		 1306 dot = old;
1307 }
9f9354b9 1308 if (strlen(dot) + strlen(dev->name) < IFNAMSIZ)
e905a9ed 1309 strcat(ifa->ifa_label, dot);
9f9354b9 1310 else
e905a9ed 1311 strcpy(ifa->ifa_label + (IFNAMSIZ - strlen(dot) - 1), dot);
573bf470
TG		 1312skip:
1313 rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0);
e905a9ed
YH		 1314 }
1315}
1da177e4 1316
40384999 1317static bool inetdev_valid_mtu(unsigned int mtu)
06770843
BL		 1318{
1319 return mtu >= 68;
1320}
1321
d11327ad
IC		 1322static void inetdev_send_gratuitous_arp(struct net_device *dev,
1323 struct in_device *in_dev)
1324
1325{
b76d0789 1326 struct in_ifaddr *ifa;
d11327ad 1327
b76d0789
ZK		 1328 for (ifa = in_dev->ifa_list; ifa;
1329 ifa = ifa->ifa_next) {
1330 arp_send(ARPOP_REQUEST, ETH_P_ARP,
1331 ifa->ifa_local, dev,
1332 ifa->ifa_local, NULL,
1333 dev->dev_addr, NULL);
1334 }
d11327ad
IC		 1335}
1336
1da177e4
LT		 1337/* Called only under RTNL semaphore */
1338
1339static int inetdev_event(struct notifier_block *this, unsigned long event,
1340 void *ptr)
1341{
351638e7 1342 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
748e2d93 1343 struct in_device *in_dev = __in_dev_get_rtnl(dev);
0115e8e3 1344
1da177e4
LT		 1345 ASSERT_RTNL();
1346
1347 if (!in_dev) {
8030f544 1348 if (event == NETDEV_REGISTER) {
1da177e4 1349 in_dev = inetdev_init(dev);
b217d616
HX		 1350 if (!in_dev)
1351 return notifier_from_errno(-ENOMEM);
0cc217e1 1352 if (dev->flags & IFF_LOOPBACK) {
42f811b8
HX		 1353 IN_DEV_CONF_SET(in_dev, NOXFRM, 1);
1354 IN_DEV_CONF_SET(in_dev, NOPOLICY, 1);
8030f544 1355 }
06770843
BL		 1356 } else if (event == NETDEV_CHANGEMTU) {
1357 /* Re-enabling IP */
1358 if (inetdev_valid_mtu(dev->mtu))
1359 in_dev = inetdev_init(dev);
1da177e4
LT		 1360 }
1361 goto out;
1362 }
1363
1364 switch (event) {
1365 case NETDEV_REGISTER:
91df42be 1366 pr_debug("%s: bug\n", __func__);
a9b3cd7f 1367 RCU_INIT_POINTER(dev->ip_ptr, NULL);
1da177e4
LT		 1368 break;
1369 case NETDEV_UP:
06770843 1370 if (!inetdev_valid_mtu(dev->mtu))
1da177e4 1371 break;
0cc217e1 1372 if (dev->flags & IFF_LOOPBACK) {
9f9354b9
ED		 1373 struct in_ifaddr *ifa = inet_alloc_ifa();
1374
1375 if (ifa) {
fd23c3b3 1376 INIT_HLIST_NODE(&ifa->hash);
1da177e4
LT		 1377 ifa->ifa_local =
1378 ifa->ifa_address = htonl(INADDR_LOOPBACK);
1379 ifa->ifa_prefixlen = 8;
1380 ifa->ifa_mask = inet_make_mask(8);
1381 in_dev_hold(in_dev);
1382 ifa->ifa_dev = in_dev;
1383 ifa->ifa_scope = RT_SCOPE_HOST;
1384 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
5c766d64
JP		 1385 set_ifa_lifetime(ifa, INFINITY_LIFE_TIME,
1386 INFINITY_LIFE_TIME);
dfd1582d
JP		 1387 ipv4_devconf_setall(in_dev);
1388 neigh_parms_data_state_setall(in_dev->arp_parms);
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 */
ad6c8135 1442 + nla_total_size(IFNAMSIZ) /* IFA_LABEL */
63b5f152
GU		 1443 + nla_total_size(4) /* IFA_FLAGS */
1444 + nla_total_size(sizeof(struct ifa_cacheinfo)); /* IFA_CACHEINFO */
339bf98f
TG		 1445}
1446
5c766d64
JP		 1447static inline u32 cstamp_delta(unsigned long cstamp)
1448{
1449 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
1450}
1451
1452static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
1453 unsigned long tstamp, u32 preferred, u32 valid)
1454{
1455 struct ifa_cacheinfo ci;
1456
1457 ci.cstamp = cstamp_delta(cstamp);
1458 ci.tstamp = cstamp_delta(tstamp);
1459 ci.ifa_prefered = preferred;
1460 ci.ifa_valid = valid;
1461
1462 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
1463}
1464
1da177e4 1465static int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa,
15e47304 1466 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4
LT		 1467{
1468 struct ifaddrmsg *ifm;
1469 struct nlmsghdr *nlh;
5c766d64 1470 u32 preferred, valid;
1da177e4 1471
15e47304 1472 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*ifm), flags);
47f68512 1473 if (nlh == NULL)
26932566 1474 return -EMSGSIZE;
47f68512
TG		 1475
1476 ifm = nlmsg_data(nlh);
1da177e4
LT		 1477 ifm->ifa_family = AF_INET;
1478 ifm->ifa_prefixlen = ifa->ifa_prefixlen;
5c766d64 1479 ifm->ifa_flags = ifa->ifa_flags;
1da177e4
LT		 1480 ifm->ifa_scope = ifa->ifa_scope;
1481 ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
47f68512 1482
5c766d64
JP		 1483 if (!(ifm->ifa_flags & IFA_F_PERMANENT)) {
1484 preferred = ifa->ifa_preferred_lft;
1485 valid = ifa->ifa_valid_lft;
1486 if (preferred != INFINITY_LIFE_TIME) {
1487 long tval = (jiffies - ifa->ifa_tstamp) / HZ;
1488
1489 if (preferred > tval)
1490 preferred -= tval;
1491 else
1492 preferred = 0;
1493 if (valid != INFINITY_LIFE_TIME) {
1494 if (valid > tval)
1495 valid -= tval;
1496 else
1497 valid = 0;
1498 }
1499 }
1500 } else {
1501 preferred = INFINITY_LIFE_TIME;
1502 valid = INFINITY_LIFE_TIME;
1503 }
f3756b79
DM		 1504 if ((ifa->ifa_address &&
1505 nla_put_be32(skb, IFA_ADDRESS, ifa->ifa_address)) ||
1506 (ifa->ifa_local &&
1507 nla_put_be32(skb, IFA_LOCAL, ifa->ifa_local)) ||
1508 (ifa->ifa_broadcast &&
1509 nla_put_be32(skb, IFA_BROADCAST, ifa->ifa_broadcast)) ||
1510 (ifa->ifa_label[0] &&
5c766d64 1511 nla_put_string(skb, IFA_LABEL, ifa->ifa_label)) ||
ad6c8135 1512 nla_put_u32(skb, IFA_FLAGS, ifa->ifa_flags) ||
5c766d64
JP		 1513 put_cacheinfo(skb, ifa->ifa_cstamp, ifa->ifa_tstamp,
1514 preferred, valid))
f3756b79 1515 goto nla_put_failure;
1da177e4 1516
47f68512
TG		 1517 return nlmsg_end(skb, nlh);
1518
1519nla_put_failure:
26932566
PM		 1520 nlmsg_cancel(skb, nlh);
1521 return -EMSGSIZE;
1da177e4
LT		 1522}
1523
1524static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
1525{
3b1e0a65 1526 struct net *net = sock_net(skb->sk);
eec4df98
ED		 1527 int h, s_h;
1528 int idx, s_idx;
1529 int ip_idx, s_ip_idx;
1da177e4
LT		 1530 struct net_device *dev;
1531 struct in_device *in_dev;
1532 struct in_ifaddr *ifa;
eec4df98 1533 struct hlist_head *head;
1da177e4 1534
eec4df98
ED		 1535 s_h = cb->args[0];
1536 s_idx = idx = cb->args[1];
1537 s_ip_idx = ip_idx = cb->args[2];
1538
1539 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1540 idx = 0;
1541 head = &net->dev_index_head[h];
1542 rcu_read_lock();
0465277f
ND		 1543 cb->seq = atomic_read(&net->ipv4.dev_addr_genid) ^
1544 net->dev_base_seq;
b67bfe0d 1545 hlist_for_each_entry_rcu(dev, head, index_hlist) {
eec4df98
ED		 1546 if (idx < s_idx)
1547 goto cont;
4b97efdf 1548 if (h > s_h || idx > s_idx)
eec4df98
ED		 1549 s_ip_idx = 0;
1550 in_dev = __in_dev_get_rcu(dev);
1551 if (!in_dev)
1552 goto cont;
1da177e4 1553
eec4df98
ED		 1554 for (ifa = in_dev->ifa_list, ip_idx = 0; ifa;
1555 ifa = ifa->ifa_next, ip_idx++) {
1556 if (ip_idx < s_ip_idx)
1557 continue;
1558 if (inet_fill_ifaddr(skb, ifa,
15e47304 1559 NETLINK_CB(cb->skb).portid,
1da177e4 1560 cb->nlh->nlmsg_seq,
eec4df98
ED		 1561 RTM_NEWADDR, NLM_F_MULTI) <= 0) {
1562 rcu_read_unlock();
1563 goto done;
1564 }
0465277f 1565 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
eec4df98 1566 }
7562f876 1567cont:
eec4df98
ED		 1568 idx++;
1569 }
1570 rcu_read_unlock();
1da177e4
LT		 1571 }
1572
1573done:
eec4df98
ED		 1574 cb->args[0] = h;
1575 cb->args[1] = idx;
1576 cb->args[2] = ip_idx;
1da177e4
LT		 1577
1578 return skb->len;
1579}
1580
539afedf 1581static void rtmsg_ifa(int event, struct in_ifaddr *ifa, struct nlmsghdr *nlh,
15e47304 1582 u32 portid)
1da177e4 1583{
47f68512 1584 struct sk_buff *skb;
d6062cbb
TG		 1585 u32 seq = nlh ? nlh->nlmsg_seq : 0;
1586 int err = -ENOBUFS;
4b8aa9ab 1587 struct net *net;
1da177e4 1588
c346dca1 1589 net = dev_net(ifa->ifa_dev->dev);
339bf98f 1590 skb = nlmsg_new(inet_nlmsg_size(), GFP_KERNEL);
47f68512 1591 if (skb == NULL)
d6062cbb
TG		 1592 goto errout;
1593
15e47304 1594 err = inet_fill_ifaddr(skb, ifa, portid, seq, event, 0);
26932566
PM		 1595 if (err < 0) {
1596 /* -EMSGSIZE implies BUG in inet_nlmsg_size() */
1597 WARN_ON(err == -EMSGSIZE);
1598 kfree_skb(skb);
1599 goto errout;
1600 }
15e47304 1601 rtnl_notify(skb, net, portid, RTNLGRP_IPV4_IFADDR, nlh, GFP_KERNEL);
1ce85fe4 1602 return;
d6062cbb
TG		 1603errout:
1604 if (err < 0)
4b8aa9ab 1605 rtnl_set_sk_err(net, RTNLGRP_IPV4_IFADDR, err);
1da177e4
LT		 1606}
1607
9f0f7272
TG		 1608static size_t inet_get_link_af_size(const struct net_device *dev)
1609{
1fc19aff 1610 struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr);
9f0f7272
TG		 1611
1612 if (!in_dev)
1613 return 0;
1614
1615 return nla_total_size(IPV4_DEVCONF_MAX * 4); /* IFLA_INET_CONF */
1616}
1617
1618static int inet_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
1619{
1fc19aff 1620 struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr);
9f0f7272
TG		 1621 struct nlattr *nla;
1622 int i;
1623
1624 if (!in_dev)
1625 return -ENODATA;
1626
1627 nla = nla_reserve(skb, IFLA_INET_CONF, IPV4_DEVCONF_MAX * 4);
1628 if (nla == NULL)
1629 return -EMSGSIZE;
1630
1631 for (i = 0; i < IPV4_DEVCONF_MAX; i++)
1632 ((u32 *) nla_data(nla))[i] = in_dev->cnf.data[i];
1633
1634 return 0;
1635}
1636
1637static const struct nla_policy inet_af_policy[IFLA_INET_MAX+1] = {
1638 [IFLA_INET_CONF] = { .type = NLA_NESTED },
1639};
1640
cf7afbfe
TG		 1641static int inet_validate_link_af(const struct net_device *dev,
1642 const struct nlattr *nla)
9f0f7272 1643{
9f0f7272
TG		 1644 struct nlattr *a, *tb[IFLA_INET_MAX+1];
1645 int err, rem;
1646
f7fce74e 1647 if (dev && !__in_dev_get_rtnl(dev))
cf7afbfe 1648 return -EAFNOSUPPORT;
9f0f7272
TG		 1649
1650 err = nla_parse_nested(tb, IFLA_INET_MAX, nla, inet_af_policy);
1651 if (err < 0)
1652 return err;
1653
1654 if (tb[IFLA_INET_CONF]) {
1655 nla_for_each_nested(a, tb[IFLA_INET_CONF], rem) {
1656 int cfgid = nla_type(a);
1657
1658 if (nla_len(a) < 4)
1659 return -EINVAL;
1660
1661 if (cfgid <= 0 || cfgid > IPV4_DEVCONF_MAX)
1662 return -EINVAL;
1663 }
1664 }
1665
cf7afbfe
TG		 1666 return 0;
1667}
1668
1669static int inet_set_link_af(struct net_device *dev, const struct nlattr *nla)
1670{
f7fce74e 1671 struct in_device *in_dev = __in_dev_get_rtnl(dev);
cf7afbfe
TG		 1672 struct nlattr *a, *tb[IFLA_INET_MAX+1];
1673 int rem;
1674
1675 if (!in_dev)
1676 return -EAFNOSUPPORT;
1677
1678 if (nla_parse_nested(tb, IFLA_INET_MAX, nla, NULL) < 0)
1679 BUG();
1680
9f0f7272
TG		 1681 if (tb[IFLA_INET_CONF]) {
1682 nla_for_each_nested(a, tb[IFLA_INET_CONF], rem)
1683 ipv4_devconf_set(in_dev, nla_type(a), nla_get_u32(a));
1684 }
1685
1686 return 0;
1687}
1688
edc9e748
ND		 1689static int inet_netconf_msgsize_devconf(int type)
1690{
1691 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
1692 + nla_total_size(4); /* NETCONFA_IFINDEX */
1693
9e551110
ND		 1694 /* type -1 is used for ALL */
1695 if (type == -1 || type == NETCONFA_FORWARDING)
edc9e748 1696 size += nla_total_size(4);
cc535dfb
ND		 1697 if (type == -1 || type == NETCONFA_RP_FILTER)
1698 size += nla_total_size(4);
d67b8c61
ND		 1699 if (type == -1 || type == NETCONFA_MC_FORWARDING)
1700 size += nla_total_size(4);
09aea5df 1701 if (type == -1 || type == NETCONFA_PROXY_NEIGH)
f085ff1c 1702 size += nla_total_size(4);
edc9e748
ND		 1703
1704 return size;
1705}
1706
1707static int inet_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
1708 struct ipv4_devconf *devconf, u32 portid,
1709 u32 seq, int event, unsigned int flags,
1710 int type)
1711{
1712 struct nlmsghdr *nlh;
1713 struct netconfmsg *ncm;
1714
1715 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
1716 flags);
1717 if (nlh == NULL)
1718 return -EMSGSIZE;
1719
1720 ncm = nlmsg_data(nlh);
1721 ncm->ncm_family = AF_INET;
1722
1723 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
1724 goto nla_put_failure;
1725
9e551110
ND		 1726 /* type -1 is used for ALL */
1727 if ((type == -1 || type == NETCONFA_FORWARDING) &&
edc9e748
ND		 1728 nla_put_s32(skb, NETCONFA_FORWARDING,
1729 IPV4_DEVCONF(*devconf, FORWARDING)) < 0)
1730 goto nla_put_failure;
cc535dfb
ND		 1731 if ((type == -1 || type == NETCONFA_RP_FILTER) &&
1732 nla_put_s32(skb, NETCONFA_RP_FILTER,
1733 IPV4_DEVCONF(*devconf, RP_FILTER)) < 0)
1734 goto nla_put_failure;
d67b8c61
ND		 1735 if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
1736 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
1737 IPV4_DEVCONF(*devconf, MC_FORWARDING)) < 0)
1738 goto nla_put_failure;
09aea5df 1739 if ((type == -1 || type == NETCONFA_PROXY_NEIGH) &&
1740 nla_put_s32(skb, NETCONFA_PROXY_NEIGH,
f085ff1c 1741 IPV4_DEVCONF(*devconf, PROXY_ARP)) < 0)
1742 goto nla_put_failure;
edc9e748
ND		 1743
1744 return nlmsg_end(skb, nlh);
1745
1746nla_put_failure:
1747 nlmsg_cancel(skb, nlh);
1748 return -EMSGSIZE;
1749}
1750
d67b8c61
ND		 1751void inet_netconf_notify_devconf(struct net *net, int type, int ifindex,
1752 struct ipv4_devconf *devconf)
edc9e748
ND		 1753{
1754 struct sk_buff *skb;
1755 int err = -ENOBUFS;
1756
1757 skb = nlmsg_new(inet_netconf_msgsize_devconf(type), GFP_ATOMIC);
1758 if (skb == NULL)
1759 goto errout;
1760
1761 err = inet_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
1762 RTM_NEWNETCONF, 0, type);
1763 if (err < 0) {
1764 /* -EMSGSIZE implies BUG in inet_netconf_msgsize_devconf() */
1765 WARN_ON(err == -EMSGSIZE);
1766 kfree_skb(skb);
1767 goto errout;
1768 }
1769 rtnl_notify(skb, net, 0, RTNLGRP_IPV4_NETCONF, NULL, GFP_ATOMIC);
1770 return;
1771errout:
1772 if (err < 0)
1773 rtnl_set_sk_err(net, RTNLGRP_IPV4_NETCONF, err);
1774}
1775
9e551110
ND		 1776static const struct nla_policy devconf_ipv4_policy[NETCONFA_MAX+1] = {
1777 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
1778 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
cc535dfb 1779 [NETCONFA_RP_FILTER] = { .len = sizeof(int) },
09aea5df 1780 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
9e551110
ND		 1781};
1782
1783static int inet_netconf_get_devconf(struct sk_buff *in_skb,
661d2967 1784 struct nlmsghdr *nlh)
9e551110
ND		 1785{
1786 struct net *net = sock_net(in_skb->sk);
1787 struct nlattr *tb[NETCONFA_MAX+1];
1788 struct netconfmsg *ncm;
1789 struct sk_buff *skb;
1790 struct ipv4_devconf *devconf;
1791 struct in_device *in_dev;
1792 struct net_device *dev;
1793 int ifindex;
1794 int err;
1795
1796 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
1797 devconf_ipv4_policy);
1798 if (err < 0)
1799 goto errout;
1800
1801 err = EINVAL;
1802 if (!tb[NETCONFA_IFINDEX])
1803 goto errout;
1804
1805 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
1806 switch (ifindex) {
1807 case NETCONFA_IFINDEX_ALL:
1808 devconf = net->ipv4.devconf_all;
1809 break;
1810 case NETCONFA_IFINDEX_DEFAULT:
1811 devconf = net->ipv4.devconf_dflt;
1812 break;
1813 default:
1814 dev = __dev_get_by_index(net, ifindex);
1815 if (dev == NULL)
1816 goto errout;
1817 in_dev = __in_dev_get_rtnl(dev);
1818 if (in_dev == NULL)
1819 goto errout;
1820 devconf = &in_dev->cnf;
1821 break;
1822 }
1823
1824 err = -ENOBUFS;
1825 skb = nlmsg_new(inet_netconf_msgsize_devconf(-1), GFP_ATOMIC);
1826 if (skb == NULL)
1827 goto errout;
1828
1829 err = inet_netconf_fill_devconf(skb, ifindex, devconf,
1830 NETLINK_CB(in_skb).portid,
1831 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
1832 -1);
1833 if (err < 0) {
1834 /* -EMSGSIZE implies BUG in inet_netconf_msgsize_devconf() */
1835 WARN_ON(err == -EMSGSIZE);
1836 kfree_skb(skb);
1837 goto errout;
1838 }
1839 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
1840errout:
1841 return err;
1842}
1843
7a674200
ND		 1844static int inet_netconf_dump_devconf(struct sk_buff *skb,
1845 struct netlink_callback *cb)
1846{
1847 struct net *net = sock_net(skb->sk);
1848 int h, s_h;
1849 int idx, s_idx;
1850 struct net_device *dev;
1851 struct in_device *in_dev;
1852 struct hlist_head *head;
1853
1854 s_h = cb->args[0];
1855 s_idx = idx = cb->args[1];
1856
1857 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1858 idx = 0;
1859 head = &net->dev_index_head[h];
1860 rcu_read_lock();
0465277f
ND		 1861 cb->seq = atomic_read(&net->ipv4.dev_addr_genid) ^
1862 net->dev_base_seq;
7a674200
ND		 1863 hlist_for_each_entry_rcu(dev, head, index_hlist) {
1864 if (idx < s_idx)
1865 goto cont;
1866 in_dev = __in_dev_get_rcu(dev);
1867 if (!in_dev)
1868 goto cont;
1869
1870 if (inet_netconf_fill_devconf(skb, dev->ifindex,
1871 &in_dev->cnf,
1872 NETLINK_CB(cb->skb).portid,
1873 cb->nlh->nlmsg_seq,
1874 RTM_NEWNETCONF,
1875 NLM_F_MULTI,
1876 -1) <= 0) {
1877 rcu_read_unlock();
1878 goto done;
1879 }
0465277f 1880 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7a674200
ND		 1881cont:
1882 idx++;
1883 }
1884 rcu_read_unlock();
1885 }
1886 if (h == NETDEV_HASHENTRIES) {
1887 if (inet_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
1888 net->ipv4.devconf_all,
1889 NETLINK_CB(cb->skb).portid,
1890 cb->nlh->nlmsg_seq,
1891 RTM_NEWNETCONF, NLM_F_MULTI,
1892 -1) <= 0)
1893 goto done;
1894 else
1895 h++;
1896 }
1897 if (h == NETDEV_HASHENTRIES + 1) {
1898 if (inet_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
1899 net->ipv4.devconf_dflt,
1900 NETLINK_CB(cb->skb).portid,
1901 cb->nlh->nlmsg_seq,
1902 RTM_NEWNETCONF, NLM_F_MULTI,
1903 -1) <= 0)
1904 goto done;
1905 else
1906 h++;
1907 }
1908done:
1909 cb->args[0] = h;
1910 cb->args[1] = idx;
1911
1912 return skb->len;
1913}
1914
1da177e4
LT		 1915#ifdef CONFIG_SYSCTL
1916
c0ce9fb3 1917static void devinet_copy_dflt_conf(struct net *net, int i)
31be3085
HX		 1918{
1919 struct net_device *dev;
1920
c6d14c84
ED		 1921 rcu_read_lock();
1922 for_each_netdev_rcu(net, dev) {
31be3085 1923 struct in_device *in_dev;
c6d14c84 1924
31be3085
HX		 1925 in_dev = __in_dev_get_rcu(dev);
1926 if (in_dev && !test_bit(i, in_dev->cnf.state))
9355bbd6 1927 in_dev->cnf.data[i] = net->ipv4.devconf_dflt->data[i];
31be3085 1928 }
c6d14c84 1929 rcu_read_unlock();
31be3085
HX		 1930}
1931
c6d14c84 1932/* called with RTNL locked */
c0ce9fb3 1933static void inet_forward_change(struct net *net)
68dd299b
PE		 1934{
1935 struct net_device *dev;
586f1211 1936 int on = IPV4_DEVCONF_ALL(net, FORWARDING);
68dd299b 1937
586f1211 1938 IPV4_DEVCONF_ALL(net, ACCEPT_REDIRECTS) = !on;
9355bbd6 1939 IPV4_DEVCONF_DFLT(net, FORWARDING) = on;
edc9e748
ND		 1940 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING,
1941 NETCONFA_IFINDEX_ALL,
1942 net->ipv4.devconf_all);
1943 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING,
1944 NETCONFA_IFINDEX_DEFAULT,
1945 net->ipv4.devconf_dflt);
68dd299b 1946
c0ce9fb3 1947 for_each_netdev(net, dev) {
68dd299b 1948 struct in_device *in_dev;
0187bdfb
BH		 1949 if (on)
1950 dev_disable_lro(dev);
68dd299b
PE		 1951 rcu_read_lock();
1952 in_dev = __in_dev_get_rcu(dev);
edc9e748 1953 if (in_dev) {
68dd299b 1954 IN_DEV_CONF_SET(in_dev, FORWARDING, on);
edc9e748
ND		 1955 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING,
1956 dev->ifindex, &in_dev->cnf);
1957 }
68dd299b
PE		 1958 rcu_read_unlock();
1959 }
68dd299b
PE		 1960}
1961
f085ff1c 1962static int devinet_conf_ifindex(struct net *net, struct ipv4_devconf *cnf)
1963{
1964 if (cnf == net->ipv4.devconf_dflt)
1965 return NETCONFA_IFINDEX_DEFAULT;
1966 else if (cnf == net->ipv4.devconf_all)
1967 return NETCONFA_IFINDEX_ALL;
1968 else {
1969 struct in_device *idev
1970 = container_of(cnf, struct in_device, cnf);
1971 return idev->dev->ifindex;
1972 }
1973}
1974
fe2c6338 1975static int devinet_conf_proc(struct ctl_table *ctl, int write,
8d65af78 1976 void __user *buffer,
31be3085
HX		 1977 size_t *lenp, loff_t *ppos)
1978{
d01ff0a0 1979 int old_value = *(int *)ctl->data;
8d65af78 1980 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
d01ff0a0 1981 int new_value = *(int *)ctl->data;
31be3085
HX		 1982
1983 if (write) {
1984 struct ipv4_devconf *cnf = ctl->extra1;
c0ce9fb3 1985 struct net *net = ctl->extra2;
31be3085 1986 int i = (int *)ctl->data - cnf->data;
f085ff1c 1987 int ifindex;
31be3085
HX		 1988
1989 set_bit(i, cnf->state);
1990
9355bbd6 1991 if (cnf == net->ipv4.devconf_dflt)
c0ce9fb3 1992 devinet_copy_dflt_conf(net, i);
d0daebc3
TG		 1993 if (i == IPV4_DEVCONF_ACCEPT_LOCAL - 1 ||
1994 i == IPV4_DEVCONF_ROUTE_LOCALNET - 1)
d01ff0a0 1995 if ((new_value == 0) && (old_value != 0))
4ccfe6d4 1996 rt_cache_flush(net);
f085ff1c 1997
cc535dfb
ND		 1998 if (i == IPV4_DEVCONF_RP_FILTER - 1 &&
1999 new_value != old_value) {
f085ff1c 2000 ifindex = devinet_conf_ifindex(net, cnf);
cc535dfb
ND		 2001 inet_netconf_notify_devconf(net, NETCONFA_RP_FILTER,
2002 ifindex, cnf);
2003 }
f085ff1c 2004 if (i == IPV4_DEVCONF_PROXY_ARP - 1 &&
2005 new_value != old_value) {
2006 ifindex = devinet_conf_ifindex(net, cnf);
09aea5df 2007 inet_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
f085ff1c 2008 ifindex, cnf);
2009 }
31be3085
HX		 2010 }
2011
2012 return ret;
2013}
2014
fe2c6338 2015static int devinet_sysctl_forward(struct ctl_table *ctl, int write,
8d65af78 2016 void __user *buffer,
1da177e4
LT		 2017 size_t *lenp, loff_t *ppos)
2018{
2019 int *valp = ctl->data;
2020 int val = *valp;
88af182e 2021 loff_t pos = *ppos;
8d65af78 2022 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
1da177e4
LT		 2023
2024 if (write && *valp != val) {
c0ce9fb3
PE		 2025 struct net *net = ctl->extra2;
2026
0187bdfb 2027 if (valp != &IPV4_DEVCONF_DFLT(net, FORWARDING)) {
88af182e
EB		 2028 if (!rtnl_trylock()) {
2029 /* Restore the original values before restarting */
2030 *valp = val;
2031 *ppos = pos;
9b8adb5e 2032 return restart_syscall();
88af182e 2033 }
0187bdfb
BH		 2034 if (valp == &IPV4_DEVCONF_ALL(net, FORWARDING)) {
2035 inet_forward_change(net);
edc9e748 2036 } else {
0187bdfb
BH		 2037 struct ipv4_devconf *cnf = ctl->extra1;
2038 struct in_device *idev =
2039 container_of(cnf, struct in_device, cnf);
edc9e748
ND		 2040 if (*valp)
2041 dev_disable_lro(idev->dev);
2042 inet_netconf_notify_devconf(net,
2043 NETCONFA_FORWARDING,
2044 idev->dev->ifindex,
2045 cnf);
0187bdfb
BH		 2046 }
2047 rtnl_unlock();
4ccfe6d4 2048 rt_cache_flush(net);
edc9e748
ND		 2049 } else
2050 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING,
2051 NETCONFA_IFINDEX_DEFAULT,
2052 net->ipv4.devconf_dflt);
1da177e4
LT		 2053 }
2054
2055 return ret;
2056}
2057
fe2c6338 2058static int ipv4_doint_and_flush(struct ctl_table *ctl, int write,
323e126f
DM		 2059 void __user *buffer,
2060 size_t *lenp, loff_t *ppos)
1da177e4
LT		 2061{
2062 int *valp = ctl->data;
2063 int val = *valp;
8d65af78 2064 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
76e6ebfb 2065 struct net *net = ctl->extra2;
1da177e4
LT		 2066
2067 if (write && *valp != val)
4ccfe6d4 2068 rt_cache_flush(net);
1da177e4
LT		 2069
2070 return ret;
2071}
2072
f8572d8f 2073#define DEVINET_SYSCTL_ENTRY(attr, name, mval, proc) \
42f811b8 2074 { \
42f811b8
HX		 2075 .procname = name, \
2076 .data = ipv4_devconf.data + \
02291680 2077 IPV4_DEVCONF_ ## attr - 1, \
42f811b8
HX		 2078 .maxlen = sizeof(int), \
2079 .mode = mval, \
2080 .proc_handler = proc, \
31be3085 2081 .extra1 = &ipv4_devconf, \
42f811b8
HX		 2082 }
2083
2084#define DEVINET_SYSCTL_RW_ENTRY(attr, name) \
f8572d8f 2085 DEVINET_SYSCTL_ENTRY(attr, name, 0644, devinet_conf_proc)
42f811b8
HX		 2086
2087#define DEVINET_SYSCTL_RO_ENTRY(attr, name) \
f8572d8f 2088 DEVINET_SYSCTL_ENTRY(attr, name, 0444, devinet_conf_proc)
42f811b8 2089
f8572d8f
EB		 2090#define DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, proc) \
2091 DEVINET_SYSCTL_ENTRY(attr, name, 0644, proc)
42f811b8
HX		 2092
2093#define DEVINET_SYSCTL_FLUSHING_ENTRY(attr, name) \
f8572d8f 2094 DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, ipv4_doint_and_flush)
42f811b8 2095
1da177e4
LT		 2096static struct devinet_sysctl_table {
2097 struct ctl_table_header *sysctl_header;
02291680 2098 struct ctl_table devinet_vars[__IPV4_DEVCONF_MAX];
1da177e4
LT		 2099} devinet_sysctl = {
2100 .devinet_vars = {
42f811b8 2101 DEVINET_SYSCTL_COMPLEX_ENTRY(FORWARDING, "forwarding",
f8572d8f 2102 devinet_sysctl_forward),
42f811b8
HX		 2103 DEVINET_SYSCTL_RO_ENTRY(MC_FORWARDING, "mc_forwarding"),
2104
2105 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_REDIRECTS, "accept_redirects"),
2106 DEVINET_SYSCTL_RW_ENTRY(SECURE_REDIRECTS, "secure_redirects"),
2107 DEVINET_SYSCTL_RW_ENTRY(SHARED_MEDIA, "shared_media"),
2108 DEVINET_SYSCTL_RW_ENTRY(RP_FILTER, "rp_filter"),
2109 DEVINET_SYSCTL_RW_ENTRY(SEND_REDIRECTS, "send_redirects"),
2110 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_SOURCE_ROUTE,
2111 "accept_source_route"),
8153a10c 2112 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_LOCAL, "accept_local"),
28f6aeea 2113 DEVINET_SYSCTL_RW_ENTRY(SRC_VMARK, "src_valid_mark"),
42f811b8
HX		 2114 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP, "proxy_arp"),
2115 DEVINET_SYSCTL_RW_ENTRY(MEDIUM_ID, "medium_id"),
2116 DEVINET_SYSCTL_RW_ENTRY(BOOTP_RELAY, "bootp_relay"),
2117 DEVINET_SYSCTL_RW_ENTRY(LOG_MARTIANS, "log_martians"),
2118 DEVINET_SYSCTL_RW_ENTRY(TAG, "tag"),
2119 DEVINET_SYSCTL_RW_ENTRY(ARPFILTER, "arp_filter"),
2120 DEVINET_SYSCTL_RW_ENTRY(ARP_ANNOUNCE, "arp_announce"),
2121 DEVINET_SYSCTL_RW_ENTRY(ARP_IGNORE, "arp_ignore"),
2122 DEVINET_SYSCTL_RW_ENTRY(ARP_ACCEPT, "arp_accept"),
eefef1cf 2123 DEVINET_SYSCTL_RW_ENTRY(ARP_NOTIFY, "arp_notify"),
65324144 2124 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP_PVLAN, "proxy_arp_pvlan"),
5c6fe01c
WM		 2125 DEVINET_SYSCTL_RW_ENTRY(FORCE_IGMP_VERSION,
2126 "force_igmp_version"),
2690048c
WM		 2127 DEVINET_SYSCTL_RW_ENTRY(IGMPV2_UNSOLICITED_REPORT_INTERVAL,
2128 "igmpv2_unsolicited_report_interval"),
2129 DEVINET_SYSCTL_RW_ENTRY(IGMPV3_UNSOLICITED_REPORT_INTERVAL,
2130 "igmpv3_unsolicited_report_interval"),
42f811b8
HX		 2131
2132 DEVINET_SYSCTL_FLUSHING_ENTRY(NOXFRM, "disable_xfrm"),
2133 DEVINET_SYSCTL_FLUSHING_ENTRY(NOPOLICY, "disable_policy"),
42f811b8
HX		 2134 DEVINET_SYSCTL_FLUSHING_ENTRY(PROMOTE_SECONDARIES,
2135 "promote_secondaries"),
d0daebc3
TG		 2136 DEVINET_SYSCTL_FLUSHING_ENTRY(ROUTE_LOCALNET,
2137 "route_localnet"),
1da177e4 2138 },
1da177e4
LT		 2139};
2140
ea40b324 2141static int __devinet_sysctl_register(struct net *net, char *dev_name,
f8572d8f 2142 struct ipv4_devconf *p)
1da177e4
LT		 2143{
2144 int i;
9fa89642 2145 struct devinet_sysctl_table *t;
8607ddb8 2146 char path[sizeof("net/ipv4/conf/") + IFNAMSIZ];
bfada697 2147
9fa89642 2148 t = kmemdup(&devinet_sysctl, sizeof(*t), GFP_KERNEL);
1da177e4 2149 if (!t)
9fa89642
PE		 2150 goto out;
2151
1da177e4
LT		 2152 for (i = 0; i < ARRAY_SIZE(t->devinet_vars) - 1; i++) {
2153 t->devinet_vars[i].data += (char *)p - (char *)&ipv4_devconf;
31be3085 2154 t->devinet_vars[i].extra1 = p;
c0ce9fb3 2155 t->devinet_vars[i].extra2 = net;
1da177e4
LT		 2156 }
2157
8607ddb8 2158 snprintf(path, sizeof(path), "net/ipv4/conf/%s", dev_name);
1da177e4 2159
8607ddb8 2160 t->sysctl_header = register_net_sysctl(net, path, t->devinet_vars);
1da177e4 2161 if (!t->sysctl_header)
8607ddb8 2162 goto free;
1da177e4
LT		 2163
2164 p->sysctl = t;
ea40b324 2165 return 0;
1da177e4 2166
9fa89642 2167free:
1da177e4 2168 kfree(t);
9fa89642 2169out:
ea40b324 2170 return -ENOBUFS;
1da177e4
LT		 2171}
2172
51602b2a
PE		 2173static void __devinet_sysctl_unregister(struct ipv4_devconf *cnf)
2174{
2175 struct devinet_sysctl_table *t = cnf->sysctl;
2176
2177 if (t == NULL)
2178 return;
2179
2180 cnf->sysctl = NULL;
ff538818 2181 unregister_net_sysctl_table(t->sysctl_header);
51602b2a
PE		 2182 kfree(t);
2183}
2184
66f27a52
PE		 2185static void devinet_sysctl_register(struct in_device *idev)
2186{
73af614a 2187 neigh_sysctl_register(idev->dev, idev->arp_parms, NULL);
c346dca1 2188 __devinet_sysctl_register(dev_net(idev->dev), idev->dev->name,
f8572d8f 2189 &idev->cnf);
66f27a52
PE		 2190}
2191
51602b2a 2192static void devinet_sysctl_unregister(struct in_device *idev)
1da177e4 2193{
51602b2a
PE		 2194 __devinet_sysctl_unregister(&idev->cnf);
2195 neigh_sysctl_unregister(idev->arp_parms);
1da177e4 2196}
1da177e4 2197
68dd299b
PE		 2198static struct ctl_table ctl_forward_entry[] = {
2199 {
68dd299b
PE		 2200 .procname = "ip_forward",
2201 .data = &ipv4_devconf.data[
02291680 2202 IPV4_DEVCONF_FORWARDING - 1],
68dd299b
PE		 2203 .maxlen = sizeof(int),
2204 .mode = 0644,
2205 .proc_handler = devinet_sysctl_forward,
68dd299b 2206 .extra1 = &ipv4_devconf,
c0ce9fb3 2207 .extra2 = &init_net,
68dd299b
PE		 2208 },
2209 { },
2210};
2a75de0c 2211#endif
68dd299b 2212
752d14dc
PE		 2213static __net_init int devinet_init_net(struct net *net)
2214{
2215 int err;
752d14dc 2216 struct ipv4_devconf *all, *dflt;
2a75de0c
ED		 2217#ifdef CONFIG_SYSCTL
2218 struct ctl_table *tbl = ctl_forward_entry;
752d14dc 2219 struct ctl_table_header *forw_hdr;
2a75de0c 2220#endif
752d14dc
PE		 2221
2222 err = -ENOMEM;
2223 all = &ipv4_devconf;
2224 dflt = &ipv4_devconf_dflt;
752d14dc 2225
09ad9bc7 2226 if (!net_eq(net, &init_net)) {
752d14dc
PE		 2227 all = kmemdup(all, sizeof(ipv4_devconf), GFP_KERNEL);
2228 if (all == NULL)
2229 goto err_alloc_all;
2230
2231 dflt = kmemdup(dflt, sizeof(ipv4_devconf_dflt), GFP_KERNEL);
2232 if (dflt == NULL)
2233 goto err_alloc_dflt;
2234
2a75de0c 2235#ifdef CONFIG_SYSCTL
752d14dc
PE		 2236 tbl = kmemdup(tbl, sizeof(ctl_forward_entry), GFP_KERNEL);
2237 if (tbl == NULL)
2238 goto err_alloc_ctl;
2239
02291680 2240 tbl[0].data = &all->data[IPV4_DEVCONF_FORWARDING - 1];
752d14dc
PE		 2241 tbl[0].extra1 = all;
2242 tbl[0].extra2 = net;
2a75de0c 2243#endif
752d14dc
PE		 2244 }
2245
2246#ifdef CONFIG_SYSCTL
f8572d8f 2247 err = __devinet_sysctl_register(net, "all", all);
752d14dc
PE		 2248 if (err < 0)
2249 goto err_reg_all;
2250
f8572d8f 2251 err = __devinet_sysctl_register(net, "default", dflt);
752d14dc
PE		 2252 if (err < 0)
2253 goto err_reg_dflt;
2254
2255 err = -ENOMEM;
8607ddb8 2256 forw_hdr = register_net_sysctl(net, "net/ipv4", tbl);
752d14dc
PE		 2257 if (forw_hdr == NULL)
2258 goto err_reg_ctl;
2a75de0c 2259 net->ipv4.forw_hdr = forw_hdr;
752d14dc
PE		 2260#endif
2261
752d14dc
PE		 2262 net->ipv4.devconf_all = all;
2263 net->ipv4.devconf_dflt = dflt;
2264 return 0;
2265
2266#ifdef CONFIG_SYSCTL
2267err_reg_ctl:
2268 __devinet_sysctl_unregister(dflt);
2269err_reg_dflt:
2270 __devinet_sysctl_unregister(all);
2271err_reg_all:
2272 if (tbl != ctl_forward_entry)
2273 kfree(tbl);
752d14dc 2274err_alloc_ctl:
2a75de0c 2275#endif
752d14dc
PE		 2276 if (dflt != &ipv4_devconf_dflt)
2277 kfree(dflt);
2278err_alloc_dflt:
2279 if (all != &ipv4_devconf)
2280 kfree(all);
2281err_alloc_all:
2282 return err;
2283}
2284
2285static __net_exit void devinet_exit_net(struct net *net)
2286{
2a75de0c 2287#ifdef CONFIG_SYSCTL
752d14dc
PE		 2288 struct ctl_table *tbl;
2289
2290 tbl = net->ipv4.forw_hdr->ctl_table_arg;
752d14dc
PE		 2291 unregister_net_sysctl_table(net->ipv4.forw_hdr);
2292 __devinet_sysctl_unregister(net->ipv4.devconf_dflt);
2293 __devinet_sysctl_unregister(net->ipv4.devconf_all);
752d14dc 2294 kfree(tbl);
2a75de0c 2295#endif
752d14dc
PE		 2296 kfree(net->ipv4.devconf_dflt);
2297 kfree(net->ipv4.devconf_all);
2298}
2299
2300static __net_initdata struct pernet_operations devinet_ops = {
2301 .init = devinet_init_net,
2302 .exit = devinet_exit_net,
2303};
2304
9f0f7272
TG		 2305static struct rtnl_af_ops inet_af_ops = {
2306 .family = AF_INET,
2307 .fill_link_af = inet_fill_link_af,
2308 .get_link_af_size = inet_get_link_af_size,
cf7afbfe
TG		 2309 .validate_link_af = inet_validate_link_af,
2310 .set_link_af = inet_set_link_af,
9f0f7272
TG		 2311};
2312
1da177e4
LT		 2313void __init devinet_init(void)
2314{
fd23c3b3
DM		 2315 int i;
2316
2317 for (i = 0; i < IN4_ADDR_HSIZE; i++)
2318 INIT_HLIST_HEAD(&inet_addr_lst[i]);
2319
752d14dc
PE		 2320 register_pernet_subsys(&devinet_ops);
2321
1da177e4
LT		 2322 register_gifconf(PF_INET, inet_gifconf);
2323 register_netdevice_notifier(&ip_netdev_notifier);
63f3444f 2324
906e073f 2325 queue_delayed_work(system_power_efficient_wq, &check_lifetime_work, 0);
5c766d64 2326
9f0f7272
TG		 2327 rtnl_af_register(&inet_af_ops);
2328
c7ac8679
GR		 2329 rtnl_register(PF_INET, RTM_NEWADDR, inet_rtm_newaddr, NULL, NULL);
2330 rtnl_register(PF_INET, RTM_DELADDR, inet_rtm_deladdr, NULL, NULL);
2331 rtnl_register(PF_INET, RTM_GETADDR, NULL, inet_dump_ifaddr, NULL);
9e551110 2332 rtnl_register(PF_INET, RTM_GETNETCONF, inet_netconf_get_devconf,
7a674200 2333 inet_netconf_dump_devconf, NULL);
1da177e4
LT		 2334}
2335
Linux kernel - Deliverables
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