]> git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blame - net/ipv4/devinet.c
projects / mirror_ubuntu-bionic-kernel.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
IPv6: add the option to use anycast addresses as source addresses in echo reply
[mirror_ubuntu-bionic-kernel.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
DM		 108static struct hlist_head inet_addr_lst[IN4_ADDR_HSIZE];
109static DEFINE_SPINLOCK(inet_addr_hash_lock);
110
40384999 111static u32 inet_addr_hash(struct net *net, __be32 addr)
fd23c3b3 112{
40384999 113 u32 val = (__force u32) addr ^ net_hash_mix(net);
fd23c3b3 114
40384999 115 return hash_32(val, IN4_ADDR_HSIZE_SHIFT);
fd23c3b3
DM		 116}
117
118static void inet_hash_insert(struct net *net, struct in_ifaddr *ifa)
119{
40384999 120 u32 hash = inet_addr_hash(net, ifa->ifa_local);
fd23c3b3
DM		 121
122 spin_lock(&inet_addr_hash_lock);
123 hlist_add_head_rcu(&ifa->hash, &inet_addr_lst[hash]);
124 spin_unlock(&inet_addr_hash_lock);
125}
126
127static void inet_hash_remove(struct in_ifaddr *ifa)
128{
129 spin_lock(&inet_addr_hash_lock);
130 hlist_del_init_rcu(&ifa->hash);
131 spin_unlock(&inet_addr_hash_lock);
132}
133
9435eb1c
DM		 134/**
135 * __ip_dev_find - find the first device with a given source address.
136 * @net: the net namespace
137 * @addr: the source address
138 * @devref: if true, take a reference on the found device
139 *
140 * If a caller uses devref=false, it should be protected by RCU, or RTNL
141 */
142struct net_device *__ip_dev_find(struct net *net, __be32 addr, bool devref)
143{
40384999 144 u32 hash = inet_addr_hash(net, addr);
9435eb1c
DM		 145 struct net_device *result = NULL;
146 struct in_ifaddr *ifa;
9435eb1c
DM		 147
148 rcu_read_lock();
b67bfe0d 149 hlist_for_each_entry_rcu(ifa, &inet_addr_lst[hash], hash) {
e066008b 150 if (ifa->ifa_local == addr) {
40384999
ED		 151 struct net_device *dev = ifa->ifa_dev->dev;
152
153 if (!net_eq(dev_net(dev), net))
154 continue;
9435eb1c
DM		 155 result = dev;
156 break;
157 }
158 }
406b6f97
DM		 159 if (!result) {
160 struct flowi4 fl4 = { .daddr = addr };
161 struct fib_result res = { 0 };
162 struct fib_table *local;
163
164 /* Fallback to FIB local table so that communication
165 * over loopback subnets work.
166 */
167 local = fib_get_table(net, RT_TABLE_LOCAL);
168 if (local &&
169 !fib_table_lookup(local, &fl4, &res, FIB_LOOKUP_NOREF) &&
170 res.type == RTN_LOCAL)
171 result = FIB_RES_DEV(res);
172 }
9435eb1c
DM		 173 if (result && devref)
174 dev_hold(result);
175 rcu_read_unlock();
176 return result;
177}
178EXPORT_SYMBOL(__ip_dev_find);
179
d6062cbb 180static void rtmsg_ifa(int event, struct in_ifaddr *, struct nlmsghdr *, u32);
1da177e4 181
e041c683 182static BLOCKING_NOTIFIER_HEAD(inetaddr_chain);
1da177e4
LT		 183static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
184 int destroy);
185#ifdef CONFIG_SYSCTL
66f27a52 186static void devinet_sysctl_register(struct in_device *idev);
51602b2a
PE		 187static void devinet_sysctl_unregister(struct in_device *idev);
188#else
40384999 189static void devinet_sysctl_register(struct in_device *idev)
51602b2a
PE		 190{
191}
40384999 192static void devinet_sysctl_unregister(struct in_device *idev)
51602b2a
PE		 193{
194}
1da177e4
LT		 195#endif
196
197/* Locks all the inet devices. */
198
199static struct in_ifaddr *inet_alloc_ifa(void)
200{
93adcc80 201 return kzalloc(sizeof(struct in_ifaddr), GFP_KERNEL);
1da177e4
LT		 202}
203
204static void inet_rcu_free_ifa(struct rcu_head *head)
205{
206 struct in_ifaddr *ifa = container_of(head, struct in_ifaddr, rcu_head);
207 if (ifa->ifa_dev)
208 in_dev_put(ifa->ifa_dev);
209 kfree(ifa);
210}
211
40384999 212static void inet_free_ifa(struct in_ifaddr *ifa)
1da177e4
LT		 213{
214 call_rcu(&ifa->rcu_head, inet_rcu_free_ifa);
215}
216
217void in_dev_finish_destroy(struct in_device *idev)
218{
219 struct net_device *dev = idev->dev;
220
547b792c
IJ		 221 WARN_ON(idev->ifa_list);
222 WARN_ON(idev->mc_list);
e9897071 223 kfree(rcu_dereference_protected(idev->mc_hash, 1));
1da177e4 224#ifdef NET_REFCNT_DEBUG
91df42be 225 pr_debug("%s: %p=%s\n", __func__, idev, dev ? dev->name : "NIL");
1da177e4
LT		 226#endif
227 dev_put(dev);
228 if (!idev->dead)
9f9354b9
ED		 229 pr_err("Freeing alive in_device %p\n", idev);
230 else
1da177e4 231 kfree(idev);
1da177e4 232}
9f9354b9 233EXPORT_SYMBOL(in_dev_finish_destroy);
1da177e4 234
71e27da9 235static struct in_device *inetdev_init(struct net_device *dev)
1da177e4
LT		 236{
237 struct in_device *in_dev;
238
239 ASSERT_RTNL();
240
0da974f4 241 in_dev = kzalloc(sizeof(*in_dev), GFP_KERNEL);
1da177e4
LT		 242 if (!in_dev)
243 goto out;
c346dca1 244 memcpy(&in_dev->cnf, dev_net(dev)->ipv4.devconf_dflt,
9355bbd6 245 sizeof(in_dev->cnf));
1da177e4
LT		 246 in_dev->cnf.sysctl = NULL;
247 in_dev->dev = dev;
9f9354b9
ED		 248 in_dev->arp_parms = neigh_parms_alloc(dev, &arp_tbl);
249 if (!in_dev->arp_parms)
1da177e4 250 goto out_kfree;
0187bdfb
BH		 251 if (IPV4_DEVCONF(in_dev->cnf, FORWARDING))
252 dev_disable_lro(dev);
1da177e4
LT		 253 /* Reference in_dev->dev */
254 dev_hold(dev);
30c4cf57 255 /* Account for reference dev->ip_ptr (below) */
1da177e4 256 in_dev_hold(in_dev);
1da177e4 257
66f27a52 258 devinet_sysctl_register(in_dev);
1da177e4
LT		 259 ip_mc_init_dev(in_dev);
260 if (dev->flags & IFF_UP)
261 ip_mc_up(in_dev);
483479ec 262
30c4cf57 263 /* we can receive as soon as ip_ptr is set -- do this last */
cf778b00 264 rcu_assign_pointer(dev->ip_ptr, in_dev);
483479ec 265out:
1da177e4
LT		 266 return in_dev;
267out_kfree:
268 kfree(in_dev);
269 in_dev = NULL;
270 goto out;
271}
272
273static void in_dev_rcu_put(struct rcu_head *head)
274{
275 struct in_device *idev = container_of(head, struct in_device, rcu_head);
276 in_dev_put(idev);
277}
278
279static void inetdev_destroy(struct in_device *in_dev)
280{
281 struct in_ifaddr *ifa;
282 struct net_device *dev;
283
284 ASSERT_RTNL();
285
286 dev = in_dev->dev;
1da177e4
LT		 287
288 in_dev->dead = 1;
289
290 ip_mc_destroy_dev(in_dev);
291
292 while ((ifa = in_dev->ifa_list) != NULL) {
293 inet_del_ifa(in_dev, &in_dev->ifa_list, 0);
294 inet_free_ifa(ifa);
295 }
296
a9b3cd7f 297 RCU_INIT_POINTER(dev->ip_ptr, NULL);
1da177e4 298
51602b2a 299 devinet_sysctl_unregister(in_dev);
1da177e4
LT		 300 neigh_parms_release(&arp_tbl, in_dev->arp_parms);
301 arp_ifdown(dev);
302
303 call_rcu(&in_dev->rcu_head, in_dev_rcu_put);
304}
305
ff428d72 306int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b)
1da177e4
LT		 307{
308 rcu_read_lock();
309 for_primary_ifa(in_dev) {
310 if (inet_ifa_match(a, ifa)) {
311 if (!b || inet_ifa_match(b, ifa)) {
312 rcu_read_unlock();
313 return 1;
314 }
315 }
316 } endfor_ifa(in_dev);
317 rcu_read_unlock();
318 return 0;
319}
320
d6062cbb 321static void __inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
15e47304 322 int destroy, struct nlmsghdr *nlh, u32 portid)
1da177e4 323{
8f937c60 324 struct in_ifaddr *promote = NULL;
0ff60a45
JHS		 325 struct in_ifaddr *ifa, *ifa1 = *ifap;
326 struct in_ifaddr *last_prim = in_dev->ifa_list;
327 struct in_ifaddr *prev_prom = NULL;
328 int do_promote = IN_DEV_PROMOTE_SECONDARIES(in_dev);
1da177e4
LT		 329
330 ASSERT_RTNL();
331
e905a9ed 332 /* 1. Deleting primary ifaddr forces deletion all secondaries
8f937c60
HW		 333 * unless alias promotion is set
334 **/
1da177e4
LT		 335
336 if (!(ifa1->ifa_flags & IFA_F_SECONDARY)) {
1da177e4
LT		 337 struct in_ifaddr **ifap1 = &ifa1->ifa_next;
338
339 while ((ifa = *ifap1) != NULL) {
e905a9ed 340 if (!(ifa->ifa_flags & IFA_F_SECONDARY) &&
0ff60a45
JHS		 341 ifa1->ifa_scope <= ifa->ifa_scope)
342 last_prim = ifa;
343
1da177e4
LT		 344 if (!(ifa->ifa_flags & IFA_F_SECONDARY) ||
345 ifa1->ifa_mask != ifa->ifa_mask ||
346 !inet_ifa_match(ifa1->ifa_address, ifa)) {
347 ifap1 = &ifa->ifa_next;
0ff60a45 348 prev_prom = ifa;
1da177e4
LT		 349 continue;
350 }
351
0ff60a45 352 if (!do_promote) {
fd23c3b3 353 inet_hash_remove(ifa);
8f937c60 354 *ifap1 = ifa->ifa_next;
1da177e4 355
15e47304 356 rtmsg_ifa(RTM_DELADDR, ifa, nlh, portid);
e041c683
AS		 357 blocking_notifier_call_chain(&inetaddr_chain,
358 NETDEV_DOWN, ifa);
8f937c60
HW		 359 inet_free_ifa(ifa);
360 } else {
361 promote = ifa;
362 break;
363 }
1da177e4
LT		 364 }
365 }
366
2d230e2b
JA		 367 /* On promotion all secondaries from subnet are changing
368 * the primary IP, we must remove all their routes silently
369 * and later to add them back with new prefsrc. Do this
370 * while all addresses are on the device list.
371 */
372 for (ifa = promote; ifa; ifa = ifa->ifa_next) {
373 if (ifa1->ifa_mask == ifa->ifa_mask &&
374 inet_ifa_match(ifa1->ifa_address, ifa))
375 fib_del_ifaddr(ifa, ifa1);
376 }
377
1da177e4
LT		 378 /* 2. Unlink it */
379
380 *ifap = ifa1->ifa_next;
fd23c3b3 381 inet_hash_remove(ifa1);
1da177e4
LT		 382
383 /* 3. Announce address deletion */
384
385 /* Send message first, then call notifier.
386 At first sight, FIB update triggered by notifier
387 will refer to already deleted ifaddr, that could confuse
388 netlink listeners. It is not true: look, gated sees
389 that route deleted and if it still thinks that ifaddr
390 is valid, it will try to restore deleted routes... Grr.
391 So that, this order is correct.
392 */
15e47304 393 rtmsg_ifa(RTM_DELADDR, ifa1, nlh, portid);
e041c683 394 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa1);
1da177e4 395
0ff60a45 396 if (promote) {
04024b93 397 struct in_ifaddr *next_sec = promote->ifa_next;
0ff60a45
JHS		 398
399 if (prev_prom) {
400 prev_prom->ifa_next = promote->ifa_next;
401 promote->ifa_next = last_prim->ifa_next;
402 last_prim->ifa_next = promote;
403 }
8f937c60 404
8f937c60 405 promote->ifa_flags &= ~IFA_F_SECONDARY;
15e47304 406 rtmsg_ifa(RTM_NEWADDR, promote, nlh, portid);
e041c683
AS		 407 blocking_notifier_call_chain(&inetaddr_chain,
408 NETDEV_UP, promote);
04024b93 409 for (ifa = next_sec; ifa; ifa = ifa->ifa_next) {
0ff60a45
JHS		 410 if (ifa1->ifa_mask != ifa->ifa_mask ||
411 !inet_ifa_match(ifa1->ifa_address, ifa))
412 continue;
413 fib_add_ifaddr(ifa);
414 }
415
416 }
6363097c 417 if (destroy)
0ff60a45 418 inet_free_ifa(ifa1);
1da177e4
LT		 419}
420
d6062cbb
TG		 421static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
422 int destroy)
423{
424 __inet_del_ifa(in_dev, ifap, destroy, NULL, 0);
425}
426
5c766d64
JP		 427static void check_lifetime(struct work_struct *work);
428
429static DECLARE_DELAYED_WORK(check_lifetime_work, check_lifetime);
430
d6062cbb 431static int __inet_insert_ifa(struct in_ifaddr *ifa, struct nlmsghdr *nlh,
15e47304 432 u32 portid)
1da177e4
LT		 433{
434 struct in_device *in_dev = ifa->ifa_dev;
435 struct in_ifaddr *ifa1, **ifap, **last_primary;
436
437 ASSERT_RTNL();
438
439 if (!ifa->ifa_local) {
440 inet_free_ifa(ifa);
441 return 0;
442 }
443
444 ifa->ifa_flags &= ~IFA_F_SECONDARY;
445 last_primary = &in_dev->ifa_list;
446
447 for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL;
448 ifap = &ifa1->ifa_next) {
449 if (!(ifa1->ifa_flags & IFA_F_SECONDARY) &&
450 ifa->ifa_scope <= ifa1->ifa_scope)
451 last_primary = &ifa1->ifa_next;
452 if (ifa1->ifa_mask == ifa->ifa_mask &&
453 inet_ifa_match(ifa1->ifa_address, ifa)) {
454 if (ifa1->ifa_local == ifa->ifa_local) {
455 inet_free_ifa(ifa);
456 return -EEXIST;
457 }
458 if (ifa1->ifa_scope != ifa->ifa_scope) {
459 inet_free_ifa(ifa);
460 return -EINVAL;
461 }
462 ifa->ifa_flags |= IFA_F_SECONDARY;
463 }
464 }
465
466 if (!(ifa->ifa_flags & IFA_F_SECONDARY)) {
467 net_srandom(ifa->ifa_local);
468 ifap = last_primary;
469 }
470
471 ifa->ifa_next = *ifap;
472 *ifap = ifa;
473
fd23c3b3
DM		 474 inet_hash_insert(dev_net(in_dev->dev), ifa);
475
5c766d64
JP		 476 cancel_delayed_work(&check_lifetime_work);
477 schedule_delayed_work(&check_lifetime_work, 0);
478
1da177e4
LT		 479 /* Send message first, then call notifier.
480 Notifier will trigger FIB update, so that
481 listeners of netlink will know about new ifaddr */
15e47304 482 rtmsg_ifa(RTM_NEWADDR, ifa, nlh, portid);
e041c683 483 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa);
1da177e4
LT		 484
485 return 0;
486}
487
d6062cbb
TG		 488static int inet_insert_ifa(struct in_ifaddr *ifa)
489{
490 return __inet_insert_ifa(ifa, NULL, 0);
491}
492
1da177e4
LT		 493static int inet_set_ifa(struct net_device *dev, struct in_ifaddr *ifa)
494{
e5ed6399 495 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1da177e4
LT		 496
497 ASSERT_RTNL();
498
499 if (!in_dev) {
71e27da9
HX		 500 inet_free_ifa(ifa);
501 return -ENOBUFS;
1da177e4 502 }
71e27da9 503 ipv4_devconf_setall(in_dev);
1d4c8c29 504 neigh_parms_data_state_setall(in_dev->arp_parms);
1da177e4 505 if (ifa->ifa_dev != in_dev) {
547b792c 506 WARN_ON(ifa->ifa_dev);
1da177e4
LT		 507 in_dev_hold(in_dev);
508 ifa->ifa_dev = in_dev;
509 }
f97c1e0c 510 if (ipv4_is_loopback(ifa->ifa_local))
1da177e4
LT		 511 ifa->ifa_scope = RT_SCOPE_HOST;
512 return inet_insert_ifa(ifa);
513}
514
8723e1b4
ED		 515/* Caller must hold RCU or RTNL :
516 * We dont take a reference on found in_device
517 */
7fee0ca2 518struct in_device *inetdev_by_index(struct net *net, int ifindex)
1da177e4
LT		 519{
520 struct net_device *dev;
521 struct in_device *in_dev = NULL;
c148fc2e
ED		 522
523 rcu_read_lock();
524 dev = dev_get_by_index_rcu(net, ifindex);
1da177e4 525 if (dev)
8723e1b4 526 in_dev = rcu_dereference_rtnl(dev->ip_ptr);
c148fc2e 527 rcu_read_unlock();
1da177e4
LT		 528 return in_dev;
529}
9f9354b9 530EXPORT_SYMBOL(inetdev_by_index);
1da177e4
LT		 531
532/* Called only from RTNL semaphored context. No locks. */
533
60cad5da
AV		 534struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix,
535 __be32 mask)
1da177e4
LT		 536{
537 ASSERT_RTNL();
538
539 for_primary_ifa(in_dev) {
540 if (ifa->ifa_mask == mask && inet_ifa_match(prefix, ifa))
541 return ifa;
542 } endfor_ifa(in_dev);
543 return NULL;
544}
545
661d2967 546static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 547{
3b1e0a65 548 struct net *net = sock_net(skb->sk);
dfdd5fd4 549 struct nlattr *tb[IFA_MAX+1];
1da177e4 550 struct in_device *in_dev;
dfdd5fd4 551 struct ifaddrmsg *ifm;
1da177e4 552 struct in_ifaddr *ifa, **ifap;
dfdd5fd4 553 int err = -EINVAL;
1da177e4
LT		 554
555 ASSERT_RTNL();
556
dfdd5fd4
TG		 557 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy);
558 if (err < 0)
559 goto errout;
560
561 ifm = nlmsg_data(nlh);
7fee0ca2 562 in_dev = inetdev_by_index(net, ifm->ifa_index);
dfdd5fd4
TG		 563 if (in_dev == NULL) {
564 err = -ENODEV;
565 goto errout;
566 }
567
1da177e4
LT		 568 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
569 ifap = &ifa->ifa_next) {
dfdd5fd4 570 if (tb[IFA_LOCAL] &&
a7a628c4 571 ifa->ifa_local != nla_get_be32(tb[IFA_LOCAL]))
dfdd5fd4
TG		 572 continue;
573
574 if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label))
1da177e4 575 continue;
dfdd5fd4
TG		 576
577 if (tb[IFA_ADDRESS] &&
578 (ifm->ifa_prefixlen != ifa->ifa_prefixlen ||
a7a628c4 579 !inet_ifa_match(nla_get_be32(tb[IFA_ADDRESS]), ifa)))
dfdd5fd4
TG		 580 continue;
581
15e47304 582 __inet_del_ifa(in_dev, ifap, 1, nlh, NETLINK_CB(skb).portid);
1da177e4
LT		 583 return 0;
584 }
dfdd5fd4
TG		 585
586 err = -EADDRNOTAVAIL;
587errout:
588 return err;
1da177e4
LT		 589}
590
5c766d64
JP		 591#define INFINITY_LIFE_TIME 0xFFFFFFFF
592
593static void check_lifetime(struct work_struct *work)
594{
595 unsigned long now, next, next_sec, next_sched;
596 struct in_ifaddr *ifa;
c988d1e8 597 struct hlist_node *n;
5c766d64
JP		 598 int i;
599
600 now = jiffies;
601 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
602
5c766d64 603 for (i = 0; i < IN4_ADDR_HSIZE; i++) {
c988d1e8
JP		 604 bool change_needed = false;
605
606 rcu_read_lock();
b67bfe0d 607 hlist_for_each_entry_rcu(ifa, &inet_addr_lst[i], hash) {
5c766d64
JP		 608 unsigned long age;
609
610 if (ifa->ifa_flags & IFA_F_PERMANENT)
611 continue;
612
613 /* We try to batch several events at once. */
614 age = (now - ifa->ifa_tstamp +
615 ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
616
617 if (ifa->ifa_valid_lft != INFINITY_LIFE_TIME &&
618 age >= ifa->ifa_valid_lft) {
c988d1e8 619 change_needed = true;
5c766d64
JP		 620 } else if (ifa->ifa_preferred_lft ==
621 INFINITY_LIFE_TIME) {
622 continue;
623 } else if (age >= ifa->ifa_preferred_lft) {
624 if (time_before(ifa->ifa_tstamp +
625 ifa->ifa_valid_lft * HZ, next))
626 next = ifa->ifa_tstamp +
627 ifa->ifa_valid_lft * HZ;
628
c988d1e8
JP		 629 if (!(ifa->ifa_flags & IFA_F_DEPRECATED))
630 change_needed = true;
5c766d64
JP		 631 } else if (time_before(ifa->ifa_tstamp +
632 ifa->ifa_preferred_lft * HZ,
633 next)) {
634 next = ifa->ifa_tstamp +
635 ifa->ifa_preferred_lft * HZ;
636 }
637 }
c988d1e8
JP		 638 rcu_read_unlock();
639 if (!change_needed)
640 continue;
641 rtnl_lock();
642 hlist_for_each_entry_safe(ifa, n, &inet_addr_lst[i], hash) {
643 unsigned long age;
644
645 if (ifa->ifa_flags & IFA_F_PERMANENT)
646 continue;
647
648 /* We try to batch several events at once. */
649 age = (now - ifa->ifa_tstamp +
650 ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
651
652 if (ifa->ifa_valid_lft != INFINITY_LIFE_TIME &&
653 age >= ifa->ifa_valid_lft) {
654 struct in_ifaddr **ifap;
655
656 for (ifap = &ifa->ifa_dev->ifa_list;
657 *ifap != NULL; ifap = &(*ifap)->ifa_next) {
658 if (*ifap == ifa) {
659 inet_del_ifa(ifa->ifa_dev,
660 ifap, 1);
661 break;
662 }
663 }
664 } else if (ifa->ifa_preferred_lft !=
665 INFINITY_LIFE_TIME &&
666 age >= ifa->ifa_preferred_lft &&
667 !(ifa->ifa_flags & IFA_F_DEPRECATED)) {
668 ifa->ifa_flags |= IFA_F_DEPRECATED;
669 rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0);
670 }
671 }
672 rtnl_unlock();
5c766d64 673 }
5c766d64
JP		 674
675 next_sec = round_jiffies_up(next);
676 next_sched = next;
677
678 /* If rounded timeout is accurate enough, accept it. */
679 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
680 next_sched = next_sec;
681
682 now = jiffies;
683 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
684 if (time_before(next_sched, now + ADDRCONF_TIMER_FUZZ_MAX))
685 next_sched = now + ADDRCONF_TIMER_FUZZ_MAX;
686
687 schedule_delayed_work(&check_lifetime_work, next_sched - now);
688}
689
690static void set_ifa_lifetime(struct in_ifaddr *ifa, __u32 valid_lft,
691 __u32 prefered_lft)
692{
693 unsigned long timeout;
694
695 ifa->ifa_flags &= ~(IFA_F_PERMANENT | IFA_F_DEPRECATED);
696
697 timeout = addrconf_timeout_fixup(valid_lft, HZ);
698 if (addrconf_finite_timeout(timeout))
699 ifa->ifa_valid_lft = timeout;
700 else
701 ifa->ifa_flags |= IFA_F_PERMANENT;
702
703 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
704 if (addrconf_finite_timeout(timeout)) {
705 if (timeout == 0)
706 ifa->ifa_flags |= IFA_F_DEPRECATED;
707 ifa->ifa_preferred_lft = timeout;
708 }
709 ifa->ifa_tstamp = jiffies;
710 if (!ifa->ifa_cstamp)
711 ifa->ifa_cstamp = ifa->ifa_tstamp;
712}
713
714static struct in_ifaddr *rtm_to_ifaddr(struct net *net, struct nlmsghdr *nlh,
715 __u32 *pvalid_lft, __u32 *pprefered_lft)
1da177e4 716{
5c753978
TG		 717 struct nlattr *tb[IFA_MAX+1];
718 struct in_ifaddr *ifa;
719 struct ifaddrmsg *ifm;
1da177e4
LT		 720 struct net_device *dev;
721 struct in_device *in_dev;
7b218574 722 int err;
1da177e4 723
5c753978
TG		 724 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy);
725 if (err < 0)
726 goto errout;
1da177e4 727
5c753978 728 ifm = nlmsg_data(nlh);
7b218574
DL		 729 err = -EINVAL;
730 if (ifm->ifa_prefixlen > 32 || tb[IFA_LOCAL] == NULL)
5c753978 731 goto errout;
1da177e4 732
4b8aa9ab 733 dev = __dev_get_by_index(net, ifm->ifa_index);
7b218574
DL		 734 err = -ENODEV;
735 if (dev == NULL)
5c753978 736 goto errout;
1da177e4 737
5c753978 738 in_dev = __in_dev_get_rtnl(dev);
7b218574
DL		 739 err = -ENOBUFS;
740 if (in_dev == NULL)
71e27da9 741 goto errout;
1da177e4 742
5c753978 743 ifa = inet_alloc_ifa();
7b218574 744 if (ifa == NULL)
5c753978
TG		 745 /*
746 * A potential indev allocation can be left alive, it stays
747 * assigned to its device and is destroy with it.
748 */
5c753978 749 goto errout;
5c753978 750
a4e65d36 751 ipv4_devconf_setall(in_dev);
1d4c8c29 752 neigh_parms_data_state_setall(in_dev->arp_parms);
5c753978
TG		 753 in_dev_hold(in_dev);
754
755 if (tb[IFA_ADDRESS] == NULL)
756 tb[IFA_ADDRESS] = tb[IFA_LOCAL];
1da177e4 757
fd23c3b3 758 INIT_HLIST_NODE(&ifa->hash);
1da177e4
LT		 759 ifa->ifa_prefixlen = ifm->ifa_prefixlen;
760 ifa->ifa_mask = inet_make_mask(ifm->ifa_prefixlen);
ad6c8135
JP		 761 ifa->ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) :
762 ifm->ifa_flags;
1da177e4 763 ifa->ifa_scope = ifm->ifa_scope;
5c753978
TG		 764 ifa->ifa_dev = in_dev;
765
a7a628c4
AV		 766 ifa->ifa_local = nla_get_be32(tb[IFA_LOCAL]);
767 ifa->ifa_address = nla_get_be32(tb[IFA_ADDRESS]);
5c753978
TG		 768
769 if (tb[IFA_BROADCAST])
a7a628c4 770 ifa->ifa_broadcast = nla_get_be32(tb[IFA_BROADCAST]);
5c753978 771
5c753978
TG		 772 if (tb[IFA_LABEL])
773 nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ);
1da177e4
LT		 774 else
775 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
776
5c766d64
JP		 777 if (tb[IFA_CACHEINFO]) {
778 struct ifa_cacheinfo *ci;
779
780 ci = nla_data(tb[IFA_CACHEINFO]);
781 if (!ci->ifa_valid || ci->ifa_prefered > ci->ifa_valid) {
782 err = -EINVAL;
446266b0 783 goto errout_free;
5c766d64
JP		 784 }
785 *pvalid_lft = ci->ifa_valid;
786 *pprefered_lft = ci->ifa_prefered;
787 }
788
5c753978
TG		 789 return ifa;
790
446266b0
DB		 791errout_free:
792 inet_free_ifa(ifa);
5c753978
TG		 793errout:
794 return ERR_PTR(err);
795}
796
5c766d64
JP		 797static struct in_ifaddr *find_matching_ifa(struct in_ifaddr *ifa)
798{
799 struct in_device *in_dev = ifa->ifa_dev;
800 struct in_ifaddr *ifa1, **ifap;
801
802 if (!ifa->ifa_local)
803 return NULL;
804
805 for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL;
806 ifap = &ifa1->ifa_next) {
807 if (ifa1->ifa_mask == ifa->ifa_mask &&
808 inet_ifa_match(ifa1->ifa_address, ifa) &&
809 ifa1->ifa_local == ifa->ifa_local)
810 return ifa1;
811 }
812 return NULL;
813}
814
661d2967 815static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
5c753978 816{
3b1e0a65 817 struct net *net = sock_net(skb->sk);
5c753978 818 struct in_ifaddr *ifa;
5c766d64
JP		 819 struct in_ifaddr *ifa_existing;
820 __u32 valid_lft = INFINITY_LIFE_TIME;
821 __u32 prefered_lft = INFINITY_LIFE_TIME;
5c753978
TG		 822
823 ASSERT_RTNL();
824
5c766d64 825 ifa = rtm_to_ifaddr(net, nlh, &valid_lft, &prefered_lft);
5c753978
TG		 826 if (IS_ERR(ifa))
827 return PTR_ERR(ifa);
828
5c766d64
JP		 829 ifa_existing = find_matching_ifa(ifa);
830 if (!ifa_existing) {
831 /* It would be best to check for !NLM_F_CREATE here but
832 * userspace alreay relies on not having to provide this.
833 */
834 set_ifa_lifetime(ifa, valid_lft, prefered_lft);
835 return __inet_insert_ifa(ifa, nlh, NETLINK_CB(skb).portid);
836 } else {
837 inet_free_ifa(ifa);
838
839 if (nlh->nlmsg_flags & NLM_F_EXCL ||
840 !(nlh->nlmsg_flags & NLM_F_REPLACE))
841 return -EEXIST;
34e2ed34
JP		 842 ifa = ifa_existing;
843 set_ifa_lifetime(ifa, valid_lft, prefered_lft);
05a324b9
JP		 844 cancel_delayed_work(&check_lifetime_work);
845 schedule_delayed_work(&check_lifetime_work, 0);
34e2ed34
JP		 846 rtmsg_ifa(RTM_NEWADDR, ifa, nlh, NETLINK_CB(skb).portid);
847 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa);
5c766d64
JP		 848 }
849 return 0;
1da177e4
LT		 850}
851
852/*
853 * Determine a default network mask, based on the IP address.
854 */
855
40384999 856static int inet_abc_len(__be32 addr)
1da177e4
LT		 857{
858 int rc = -1; /* Something else, probably a multicast. */
859
f97c1e0c 860 if (ipv4_is_zeronet(addr))
e905a9ed 861 rc = 0;
1da177e4 862 else {
714e85be 863 __u32 haddr = ntohl(addr);
1da177e4 864
714e85be 865 if (IN_CLASSA(haddr))
1da177e4 866 rc = 8;
714e85be 867 else if (IN_CLASSB(haddr))
1da177e4 868 rc = 16;
714e85be 869 else if (IN_CLASSC(haddr))
1da177e4
LT		 870 rc = 24;
871 }
872
e905a9ed 873 return rc;
1da177e4
LT		 874}
875
876
e5b13cb1 877int devinet_ioctl(struct net *net, unsigned int cmd, void __user *arg)
1da177e4
LT		 878{
879 struct ifreq ifr;
880 struct sockaddr_in sin_orig;
881 struct sockaddr_in *sin = (struct sockaddr_in *)&ifr.ifr_addr;
882 struct in_device *in_dev;
883 struct in_ifaddr **ifap = NULL;
884 struct in_ifaddr *ifa = NULL;
885 struct net_device *dev;
886 char *colon;
887 int ret = -EFAULT;
888 int tryaddrmatch = 0;
889
890 /*
891 * Fetch the caller's info block into kernel space
892 */
893
894 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
895 goto out;
896 ifr.ifr_name[IFNAMSIZ - 1] = 0;
897
898 /* save original address for comparison */
899 memcpy(&sin_orig, sin, sizeof(*sin));
900
901 colon = strchr(ifr.ifr_name, ':');
902 if (colon)
903 *colon = 0;
904
e5b13cb1 905 dev_load(net, ifr.ifr_name);
1da177e4 906
132adf54 907 switch (cmd) {
1da177e4
LT		 908 case SIOCGIFADDR: /* Get interface address */
909 case SIOCGIFBRDADDR: /* Get the broadcast address */
910 case SIOCGIFDSTADDR: /* Get the destination address */
911 case SIOCGIFNETMASK: /* Get the netmask for the interface */
912 /* Note that these ioctls will not sleep,
913 so that we do not impose a lock.
914 One day we will be forced to put shlock here (I mean SMP)
915 */
916 tryaddrmatch = (sin_orig.sin_family == AF_INET);
917 memset(sin, 0, sizeof(*sin));
918 sin->sin_family = AF_INET;
919 break;
920
921 case SIOCSIFFLAGS:
bf5b30b8 922 ret = -EPERM;
52e804c6 923 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 924 goto out;
925 break;
926 case SIOCSIFADDR: /* Set interface address (and family) */
927 case SIOCSIFBRDADDR: /* Set the broadcast address */
928 case SIOCSIFDSTADDR: /* Set the destination address */
929 case SIOCSIFNETMASK: /* Set the netmask for the interface */
bf5b30b8 930 ret = -EPERM;
52e804c6 931 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 932 goto out;
933 ret = -EINVAL;
934 if (sin->sin_family != AF_INET)
935 goto out;
936 break;
937 default:
938 ret = -EINVAL;
939 goto out;
940 }
941
942 rtnl_lock();
943
944 ret = -ENODEV;
9f9354b9
ED		 945 dev = __dev_get_by_name(net, ifr.ifr_name);
946 if (!dev)
1da177e4
LT		 947 goto done;
948
949 if (colon)
950 *colon = ':';
951
9f9354b9
ED		 952 in_dev = __in_dev_get_rtnl(dev);
953 if (in_dev) {
1da177e4
LT		 954 if (tryaddrmatch) {
955 /* Matthias Andree */
956 /* compare label and address (4.4BSD style) */
957 /* note: we only do this for a limited set of ioctls
958 and only if the original address family was AF_INET.
959 This is checked above. */
960 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
961 ifap = &ifa->ifa_next) {
962 if (!strcmp(ifr.ifr_name, ifa->ifa_label) &&
963 sin_orig.sin_addr.s_addr ==
6c91afe1 964 ifa->ifa_local) {
1da177e4
LT		 965 break; /* found */
966 }
967 }
968 }
969 /* we didn't get a match, maybe the application is
970 4.3BSD-style and passed in junk so we fall back to
971 comparing just the label */
972 if (!ifa) {
973 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
974 ifap = &ifa->ifa_next)
975 if (!strcmp(ifr.ifr_name, ifa->ifa_label))
976 break;
977 }
978 }
979
980 ret = -EADDRNOTAVAIL;
981 if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS)
982 goto done;
983
132adf54 984 switch (cmd) {
1da177e4
LT		 985 case SIOCGIFADDR: /* Get interface address */
986 sin->sin_addr.s_addr = ifa->ifa_local;
987 goto rarok;
988
989 case SIOCGIFBRDADDR: /* Get the broadcast address */
990 sin->sin_addr.s_addr = ifa->ifa_broadcast;
991 goto rarok;
992
993 case SIOCGIFDSTADDR: /* Get the destination address */
994 sin->sin_addr.s_addr = ifa->ifa_address;
995 goto rarok;
996
997 case SIOCGIFNETMASK: /* Get the netmask for the interface */
998 sin->sin_addr.s_addr = ifa->ifa_mask;
999 goto rarok;
1000
1001 case SIOCSIFFLAGS:
1002 if (colon) {
1003 ret = -EADDRNOTAVAIL;
1004 if (!ifa)
1005 break;
1006 ret = 0;
1007 if (!(ifr.ifr_flags & IFF_UP))
1008 inet_del_ifa(in_dev, ifap, 1);
1009 break;
1010 }
1011 ret = dev_change_flags(dev, ifr.ifr_flags);
1012 break;
1013
1014 case SIOCSIFADDR: /* Set interface address (and family) */
1015 ret = -EINVAL;
1016 if (inet_abc_len(sin->sin_addr.s_addr) < 0)
1017 break;
1018
1019 if (!ifa) {
1020 ret = -ENOBUFS;
9f9354b9
ED		 1021 ifa = inet_alloc_ifa();
1022 if (!ifa)
1da177e4 1023 break;
c7e2e1d7 1024 INIT_HLIST_NODE(&ifa->hash);
1da177e4
LT		 1025 if (colon)
1026 memcpy(ifa->ifa_label, ifr.ifr_name, IFNAMSIZ);
1027 else
1028 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1029 } else {
1030 ret = 0;
1031 if (ifa->ifa_local == sin->sin_addr.s_addr)
1032 break;
1033 inet_del_ifa(in_dev, ifap, 0);
1034 ifa->ifa_broadcast = 0;
148f9729 1035 ifa->ifa_scope = 0;
1da177e4
LT		 1036 }
1037
1038 ifa->ifa_address = ifa->ifa_local = sin->sin_addr.s_addr;
1039
1040 if (!(dev->flags & IFF_POINTOPOINT)) {
1041 ifa->ifa_prefixlen = inet_abc_len(ifa->ifa_address);
1042 ifa->ifa_mask = inet_make_mask(ifa->ifa_prefixlen);
1043 if ((dev->flags & IFF_BROADCAST) &&
1044 ifa->ifa_prefixlen < 31)
1045 ifa->ifa_broadcast = ifa->ifa_address |
1046 ~ifa->ifa_mask;
1047 } else {
1048 ifa->ifa_prefixlen = 32;
1049 ifa->ifa_mask = inet_make_mask(32);
1050 }
5c766d64 1051 set_ifa_lifetime(ifa, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 1052 ret = inet_set_ifa(dev, ifa);
1053 break;
1054
1055 case SIOCSIFBRDADDR: /* Set the broadcast address */
1056 ret = 0;
1057 if (ifa->ifa_broadcast != sin->sin_addr.s_addr) {
1058 inet_del_ifa(in_dev, ifap, 0);
1059 ifa->ifa_broadcast = sin->sin_addr.s_addr;
1060 inet_insert_ifa(ifa);
1061 }
1062 break;
1063
1064 case SIOCSIFDSTADDR: /* Set the destination address */
1065 ret = 0;
1066 if (ifa->ifa_address == sin->sin_addr.s_addr)
1067 break;
1068 ret = -EINVAL;
1069 if (inet_abc_len(sin->sin_addr.s_addr) < 0)
1070 break;
1071 ret = 0;
1072 inet_del_ifa(in_dev, ifap, 0);
1073 ifa->ifa_address = sin->sin_addr.s_addr;
1074 inet_insert_ifa(ifa);
1075 break;
1076
1077 case SIOCSIFNETMASK: /* Set the netmask for the interface */
1078
1079 /*
1080 * The mask we set must be legal.
1081 */
1082 ret = -EINVAL;
1083 if (bad_mask(sin->sin_addr.s_addr, 0))
1084 break;
1085 ret = 0;
1086 if (ifa->ifa_mask != sin->sin_addr.s_addr) {
a144ea4b 1087 __be32 old_mask = ifa->ifa_mask;
1da177e4
LT		 1088 inet_del_ifa(in_dev, ifap, 0);
1089 ifa->ifa_mask = sin->sin_addr.s_addr;
1090 ifa->ifa_prefixlen = inet_mask_len(ifa->ifa_mask);
1091
1092 /* See if current broadcast address matches
1093 * with current netmask, then recalculate
1094 * the broadcast address. Otherwise it's a
1095 * funny address, so don't touch it since
1096 * the user seems to know what (s)he's doing...
1097 */
1098 if ((dev->flags & IFF_BROADCAST) &&
1099 (ifa->ifa_prefixlen < 31) &&
1100 (ifa->ifa_broadcast ==
dcab5e1e 1101 (ifa->ifa_local|~old_mask))) {
1da177e4
LT		 1102 ifa->ifa_broadcast = (ifa->ifa_local |
1103 ~sin->sin_addr.s_addr);
1104 }
1105 inet_insert_ifa(ifa);
1106 }
1107 break;
1108 }
1109done:
1110 rtnl_unlock();
1111out:
1112 return ret;
1113rarok:
1114 rtnl_unlock();
1115 ret = copy_to_user(arg, &ifr, sizeof(struct ifreq)) ? -EFAULT : 0;
1116 goto out;
1117}
1118
1119static int inet_gifconf(struct net_device *dev, char __user *buf, int len)
1120{
e5ed6399 1121 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1da177e4
LT		 1122 struct in_ifaddr *ifa;
1123 struct ifreq ifr;
1124 int done = 0;
1125
9f9354b9 1126 if (!in_dev)
1da177e4
LT		 1127 goto out;
1128
9f9354b9 1129 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1da177e4
LT		 1130 if (!buf) {
1131 done += sizeof(ifr);
1132 continue;
1133 }
1134 if (len < (int) sizeof(ifr))
1135 break;
1136 memset(&ifr, 0, sizeof(struct ifreq));
4299c8a9 1137 strcpy(ifr.ifr_name, ifa->ifa_label);
1da177e4
LT		 1138
1139 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_family = AF_INET;
1140 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_addr.s_addr =
1141 ifa->ifa_local;
1142
1143 if (copy_to_user(buf, &ifr, sizeof(struct ifreq))) {
1144 done = -EFAULT;
1145 break;
1146 }
1147 buf += sizeof(struct ifreq);
1148 len -= sizeof(struct ifreq);
1149 done += sizeof(struct ifreq);
1150 }
1151out:
1152 return done;
1153}
1154
a61ced5d 1155__be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope)
1da177e4 1156{
a61ced5d 1157 __be32 addr = 0;
1da177e4 1158 struct in_device *in_dev;
c346dca1 1159 struct net *net = dev_net(dev);
1da177e4
LT		 1160
1161 rcu_read_lock();
e5ed6399 1162 in_dev = __in_dev_get_rcu(dev);
1da177e4
LT		 1163 if (!in_dev)
1164 goto no_in_dev;
1165
1166 for_primary_ifa(in_dev) {
1167 if (ifa->ifa_scope > scope)
1168 continue;
1169 if (!dst || inet_ifa_match(dst, ifa)) {
1170 addr = ifa->ifa_local;
1171 break;
1172 }
1173 if (!addr)
1174 addr = ifa->ifa_local;
1175 } endfor_ifa(in_dev);
1da177e4
LT		 1176
1177 if (addr)
c6d14c84 1178 goto out_unlock;
9f9354b9 1179no_in_dev:
1da177e4
LT		 1180
1181 /* Not loopback addresses on loopback should be preferred
1182 in this case. It is importnat that lo is the first interface
1183 in dev_base list.
1184 */
c6d14c84 1185 for_each_netdev_rcu(net, dev) {
9f9354b9
ED		 1186 in_dev = __in_dev_get_rcu(dev);
1187 if (!in_dev)
1da177e4
LT		 1188 continue;
1189
1190 for_primary_ifa(in_dev) {
1191 if (ifa->ifa_scope != RT_SCOPE_LINK &&
1192 ifa->ifa_scope <= scope) {
1193 addr = ifa->ifa_local;
c6d14c84 1194 goto out_unlock;
1da177e4
LT		 1195 }
1196 } endfor_ifa(in_dev);
1197 }
c6d14c84 1198out_unlock:
1da177e4 1199 rcu_read_unlock();
1da177e4
LT		 1200 return addr;
1201}
9f9354b9 1202EXPORT_SYMBOL(inet_select_addr);
1da177e4 1203
60cad5da
AV		 1204static __be32 confirm_addr_indev(struct in_device *in_dev, __be32 dst,
1205 __be32 local, int scope)
1da177e4
LT		 1206{
1207 int same = 0;
a144ea4b 1208 __be32 addr = 0;
1da177e4
LT		 1209
1210 for_ifa(in_dev) {
1211 if (!addr &&
1212 (local == ifa->ifa_local || !local) &&
1213 ifa->ifa_scope <= scope) {
1214 addr = ifa->ifa_local;
1215 if (same)
1216 break;
1217 }
1218 if (!same) {
1219 same = (!local || inet_ifa_match(local, ifa)) &&
1220 (!dst || inet_ifa_match(dst, ifa));
1221 if (same && addr) {
1222 if (local || !dst)
1223 break;
1224 /* Is the selected addr into dst subnet? */
1225 if (inet_ifa_match(addr, ifa))
1226 break;
1227 /* No, then can we use new local src? */
1228 if (ifa->ifa_scope <= scope) {
1229 addr = ifa->ifa_local;
1230 break;
1231 }
1232 /* search for large dst subnet for addr */
1233 same = 0;
1234 }
1235 }
1236 } endfor_ifa(in_dev);
1237
9f9354b9 1238 return same ? addr : 0;
1da177e4
LT		 1239}
1240
1241/*
1242 * Confirm that local IP address exists using wildcards:
b601fa19
ND		 1243 * - net: netns to check, cannot be NULL
1244 * - in_dev: only on this interface, NULL=any interface
1da177e4
LT		 1245 * - dst: only in the same subnet as dst, 0=any dst
1246 * - local: address, 0=autoselect the local address
1247 * - scope: maximum allowed scope value for the local address
1248 */
b601fa19 1249__be32 inet_confirm_addr(struct net *net, struct in_device *in_dev,
9bd85e32 1250 __be32 dst, __be32 local, int scope)
1da177e4 1251{
60cad5da 1252 __be32 addr = 0;
9bd85e32 1253 struct net_device *dev;
1da177e4 1254
b601fa19 1255 if (in_dev != NULL)
9bd85e32 1256 return confirm_addr_indev(in_dev, dst, local, scope);
1da177e4 1257
1da177e4 1258 rcu_read_lock();
c6d14c84 1259 for_each_netdev_rcu(net, dev) {
9f9354b9
ED		 1260 in_dev = __in_dev_get_rcu(dev);
1261 if (in_dev) {
1da177e4
LT		 1262 addr = confirm_addr_indev(in_dev, dst, local, scope);
1263 if (addr)
1264 break;
1265 }
1266 }
1267 rcu_read_unlock();
1da177e4
LT		 1268
1269 return addr;
1270}
eaddcd76 1271EXPORT_SYMBOL(inet_confirm_addr);
1da177e4
LT		 1272
1273/*
1274 * Device notifier
1275 */
1276
1277int register_inetaddr_notifier(struct notifier_block *nb)
1278{
e041c683 1279 return blocking_notifier_chain_register(&inetaddr_chain, nb);
1da177e4 1280}
9f9354b9 1281EXPORT_SYMBOL(register_inetaddr_notifier);
1da177e4
LT		 1282
1283int unregister_inetaddr_notifier(struct notifier_block *nb)
1284{
e041c683 1285 return blocking_notifier_chain_unregister(&inetaddr_chain, nb);
1da177e4 1286}
9f9354b9 1287EXPORT_SYMBOL(unregister_inetaddr_notifier);
1da177e4 1288
9f9354b9
ED		 1289/* Rename ifa_labels for a device name change. Make some effort to preserve
1290 * existing alias numbering and to create unique labels if possible.
1da177e4
LT		 1291*/
1292static void inetdev_changename(struct net_device *dev, struct in_device *in_dev)
e905a9ed 1293{
1da177e4
LT		 1294 struct in_ifaddr *ifa;
1295 int named = 0;
1296
e905a9ed
YH		 1297 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1298 char old[IFNAMSIZ], *dot;
1da177e4
LT		 1299
1300 memcpy(old, ifa->ifa_label, IFNAMSIZ);
e905a9ed 1301 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1da177e4 1302 if (named++ == 0)
573bf470 1303 goto skip;
44344b2a 1304 dot = strchr(old, ':');
e905a9ed
YH		 1305 if (dot == NULL) {
1306 sprintf(old, ":%d", named);
1da177e4
LT		 1307 dot = old;
1308 }
9f9354b9 1309 if (strlen(dot) + strlen(dev->name) < IFNAMSIZ)
e905a9ed 1310 strcat(ifa->ifa_label, dot);
9f9354b9 1311 else
e905a9ed 1312 strcpy(ifa->ifa_label + (IFNAMSIZ - strlen(dot) - 1), dot);
573bf470
TG		 1313skip:
1314 rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0);
e905a9ed
YH		 1315 }
1316}
1da177e4 1317
40384999 1318static bool inetdev_valid_mtu(unsigned int mtu)
06770843
BL		 1319{
1320 return mtu >= 68;
1321}
1322
d11327ad
IC		 1323static void inetdev_send_gratuitous_arp(struct net_device *dev,
1324 struct in_device *in_dev)
1325
1326{
b76d0789 1327 struct in_ifaddr *ifa;
d11327ad 1328
b76d0789
ZK		 1329 for (ifa = in_dev->ifa_list; ifa;
1330 ifa = ifa->ifa_next) {
1331 arp_send(ARPOP_REQUEST, ETH_P_ARP,
1332 ifa->ifa_local, dev,
1333 ifa->ifa_local, NULL,
1334 dev->dev_addr, NULL);
1335 }
d11327ad
IC		 1336}
1337
1da177e4
LT		 1338/* Called only under RTNL semaphore */
1339
1340static int inetdev_event(struct notifier_block *this, unsigned long event,
1341 void *ptr)
1342{
351638e7 1343 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
748e2d93 1344 struct in_device *in_dev = __in_dev_get_rtnl(dev);
0115e8e3 1345
1da177e4
LT		 1346 ASSERT_RTNL();
1347
1348 if (!in_dev) {
8030f544 1349 if (event == NETDEV_REGISTER) {
1da177e4 1350 in_dev = inetdev_init(dev);
b217d616
HX		 1351 if (!in_dev)
1352 return notifier_from_errno(-ENOMEM);
0cc217e1 1353 if (dev->flags & IFF_LOOPBACK) {
42f811b8
HX		 1354 IN_DEV_CONF_SET(in_dev, NOXFRM, 1);
1355 IN_DEV_CONF_SET(in_dev, NOPOLICY, 1);
8030f544 1356 }
06770843
BL		 1357 } else if (event == NETDEV_CHANGEMTU) {
1358 /* Re-enabling IP */
1359 if (inetdev_valid_mtu(dev->mtu))
1360 in_dev = inetdev_init(dev);
1da177e4
LT		 1361 }
1362 goto out;
1363 }
1364
1365 switch (event) {
1366 case NETDEV_REGISTER:
91df42be 1367 pr_debug("%s: bug\n", __func__);
a9b3cd7f 1368 RCU_INIT_POINTER(dev->ip_ptr, NULL);
1da177e4
LT		 1369 break;
1370 case NETDEV_UP:
06770843 1371 if (!inetdev_valid_mtu(dev->mtu))
1da177e4 1372 break;
0cc217e1 1373 if (dev->flags & IFF_LOOPBACK) {
9f9354b9
ED		 1374 struct in_ifaddr *ifa = inet_alloc_ifa();
1375
1376 if (ifa) {
fd23c3b3 1377 INIT_HLIST_NODE(&ifa->hash);
1da177e4
LT		 1378 ifa->ifa_local =
1379 ifa->ifa_address = htonl(INADDR_LOOPBACK);
1380 ifa->ifa_prefixlen = 8;
1381 ifa->ifa_mask = inet_make_mask(8);
1382 in_dev_hold(in_dev);
1383 ifa->ifa_dev = in_dev;
1384 ifa->ifa_scope = RT_SCOPE_HOST;
1385 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
5c766d64
JP		 1386 set_ifa_lifetime(ifa, INFINITY_LIFE_TIME,
1387 INFINITY_LIFE_TIME);
1da177e4
LT		 1388 inet_insert_ifa(ifa);
1389 }
1390 }
1391 ip_mc_up(in_dev);
eefef1cf
SH		 1392 /* fall through */
1393 case NETDEV_CHANGEADDR:
d11327ad
IC		 1394 if (!IN_DEV_ARP_NOTIFY(in_dev))
1395 break;
1396 /* fall through */
1397 case NETDEV_NOTIFY_PEERS:
a21090cf 1398 /* Send gratuitous ARP to notify of link change */
d11327ad 1399 inetdev_send_gratuitous_arp(dev, in_dev);
1da177e4
LT		 1400 break;
1401 case NETDEV_DOWN:
1402 ip_mc_down(in_dev);
1403 break;
93d9b7d7 1404 case NETDEV_PRE_TYPE_CHANGE:
75c78500
MS		 1405 ip_mc_unmap(in_dev);
1406 break;
93d9b7d7 1407 case NETDEV_POST_TYPE_CHANGE:
75c78500
MS		 1408 ip_mc_remap(in_dev);
1409 break;
1da177e4 1410 case NETDEV_CHANGEMTU:
06770843 1411 if (inetdev_valid_mtu(dev->mtu))
1da177e4 1412 break;
06770843 1413 /* disable IP when MTU is not enough */
1da177e4
LT		 1414 case NETDEV_UNREGISTER:
1415 inetdev_destroy(in_dev);
1416 break;
1417 case NETDEV_CHANGENAME:
1418 /* Do not notify about label change, this event is
1419 * not interesting to applications using netlink.
1420 */
1421 inetdev_changename(dev, in_dev);
1422
51602b2a 1423 devinet_sysctl_unregister(in_dev);
66f27a52 1424 devinet_sysctl_register(in_dev);
1da177e4
LT		 1425 break;
1426 }
1427out:
1428 return NOTIFY_DONE;
1429}
1430
1431static struct notifier_block ip_netdev_notifier = {
539afedf 1432 .notifier_call = inetdev_event,
1da177e4
LT		 1433};
1434
40384999 1435static size_t inet_nlmsg_size(void)
339bf98f
TG		 1436{
1437 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
1438 + nla_total_size(4) /* IFA_ADDRESS */
1439 + nla_total_size(4) /* IFA_LOCAL */
1440 + nla_total_size(4) /* IFA_BROADCAST */
ad6c8135
JP		 1441 + nla_total_size(IFNAMSIZ) /* IFA_LABEL */
1442 + nla_total_size(4); /* IFA_FLAGS */
339bf98f
TG		 1443}
1444
5c766d64
JP		 1445static inline u32 cstamp_delta(unsigned long cstamp)
1446{
1447 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
1448}
1449
1450static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
1451 unsigned long tstamp, u32 preferred, u32 valid)
1452{
1453 struct ifa_cacheinfo ci;
1454
1455 ci.cstamp = cstamp_delta(cstamp);
1456 ci.tstamp = cstamp_delta(tstamp);
1457 ci.ifa_prefered = preferred;
1458 ci.ifa_valid = valid;
1459
1460 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
1461}
1462
1da177e4 1463static int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa,
15e47304 1464 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4
LT		 1465{
1466 struct ifaddrmsg *ifm;
1467 struct nlmsghdr *nlh;
5c766d64 1468 u32 preferred, valid;
1da177e4 1469
15e47304 1470 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*ifm), flags);
47f68512 1471 if (nlh == NULL)
26932566 1472 return -EMSGSIZE;
47f68512
TG		 1473
1474 ifm = nlmsg_data(nlh);
1da177e4
LT		 1475 ifm->ifa_family = AF_INET;
1476 ifm->ifa_prefixlen = ifa->ifa_prefixlen;
5c766d64 1477 ifm->ifa_flags = ifa->ifa_flags;
1da177e4
LT		 1478 ifm->ifa_scope = ifa->ifa_scope;
1479 ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
47f68512 1480
5c766d64
JP		 1481 if (!(ifm->ifa_flags & IFA_F_PERMANENT)) {
1482 preferred = ifa->ifa_preferred_lft;
1483 valid = ifa->ifa_valid_lft;
1484 if (preferred != INFINITY_LIFE_TIME) {
1485 long tval = (jiffies - ifa->ifa_tstamp) / HZ;
1486
1487 if (preferred > tval)
1488 preferred -= tval;
1489 else
1490 preferred = 0;
1491 if (valid != INFINITY_LIFE_TIME) {
1492 if (valid > tval)
1493 valid -= tval;
1494 else
1495 valid = 0;
1496 }
1497 }
1498 } else {
1499 preferred = INFINITY_LIFE_TIME;
1500 valid = INFINITY_LIFE_TIME;
1501 }
f3756b79
DM		 1502 if ((ifa->ifa_address &&
1503 nla_put_be32(skb, IFA_ADDRESS, ifa->ifa_address)) ||
1504 (ifa->ifa_local &&
1505 nla_put_be32(skb, IFA_LOCAL, ifa->ifa_local)) ||
1506 (ifa->ifa_broadcast &&
1507 nla_put_be32(skb, IFA_BROADCAST, ifa->ifa_broadcast)) ||
1508 (ifa->ifa_label[0] &&
5c766d64 1509 nla_put_string(skb, IFA_LABEL, ifa->ifa_label)) ||
ad6c8135 1510 nla_put_u32(skb, IFA_FLAGS, ifa->ifa_flags) ||
5c766d64
JP		 1511 put_cacheinfo(skb, ifa->ifa_cstamp, ifa->ifa_tstamp,
1512 preferred, valid))
f3756b79 1513 goto nla_put_failure;
1da177e4 1514
47f68512
TG		 1515 return nlmsg_end(skb, nlh);
1516
1517nla_put_failure:
26932566
PM		 1518 nlmsg_cancel(skb, nlh);
1519 return -EMSGSIZE;
1da177e4
LT		 1520}
1521
1522static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
1523{
3b1e0a65 1524 struct net *net = sock_net(skb->sk);
eec4df98
ED		 1525 int h, s_h;
1526 int idx, s_idx;
1527 int ip_idx, s_ip_idx;
1da177e4
LT		 1528 struct net_device *dev;
1529 struct in_device *in_dev;
1530 struct in_ifaddr *ifa;
eec4df98 1531 struct hlist_head *head;
1da177e4 1532
eec4df98
ED		 1533 s_h = cb->args[0];
1534 s_idx = idx = cb->args[1];
1535 s_ip_idx = ip_idx = cb->args[2];
1536
1537 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1538 idx = 0;
1539 head = &net->dev_index_head[h];
1540 rcu_read_lock();
0465277f
ND		 1541 cb->seq = atomic_read(&net->ipv4.dev_addr_genid) ^
1542 net->dev_base_seq;
b67bfe0d 1543 hlist_for_each_entry_rcu(dev, head, index_hlist) {
eec4df98
ED		 1544 if (idx < s_idx)
1545 goto cont;
4b97efdf 1546 if (h > s_h || idx > s_idx)
eec4df98
ED		 1547 s_ip_idx = 0;
1548 in_dev = __in_dev_get_rcu(dev);
1549 if (!in_dev)
1550 goto cont;
1da177e4 1551
eec4df98
ED		 1552 for (ifa = in_dev->ifa_list, ip_idx = 0; ifa;
1553 ifa = ifa->ifa_next, ip_idx++) {
1554 if (ip_idx < s_ip_idx)
1555 continue;
1556 if (inet_fill_ifaddr(skb, ifa,
15e47304 1557 NETLINK_CB(cb->skb).portid,
1da177e4 1558 cb->nlh->nlmsg_seq,
eec4df98
ED		 1559 RTM_NEWADDR, NLM_F_MULTI) <= 0) {
1560 rcu_read_unlock();
1561 goto done;
1562 }
0465277f 1563 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
eec4df98 1564 }
7562f876 1565cont:
eec4df98
ED		 1566 idx++;
1567 }
1568 rcu_read_unlock();
1da177e4
LT		 1569 }
1570
1571done:
eec4df98
ED		 1572 cb->args[0] = h;
1573 cb->args[1] = idx;
1574 cb->args[2] = ip_idx;
1da177e4
LT		 1575
1576 return skb->len;
1577}
1578
539afedf 1579static void rtmsg_ifa(int event, struct in_ifaddr *ifa, struct nlmsghdr *nlh,
15e47304 1580 u32 portid)
1da177e4 1581{
47f68512 1582 struct sk_buff *skb;
d6062cbb
TG		 1583 u32 seq = nlh ? nlh->nlmsg_seq : 0;
1584 int err = -ENOBUFS;
4b8aa9ab 1585 struct net *net;
1da177e4 1586
c346dca1 1587 net = dev_net(ifa->ifa_dev->dev);
339bf98f 1588 skb = nlmsg_new(inet_nlmsg_size(), GFP_KERNEL);
47f68512 1589 if (skb == NULL)
d6062cbb
TG		 1590 goto errout;
1591
15e47304 1592 err = inet_fill_ifaddr(skb, ifa, portid, seq, event, 0);
26932566
PM		 1593 if (err < 0) {
1594 /* -EMSGSIZE implies BUG in inet_nlmsg_size() */
1595 WARN_ON(err == -EMSGSIZE);
1596 kfree_skb(skb);
1597 goto errout;
1598 }
15e47304 1599 rtnl_notify(skb, net, portid, RTNLGRP_IPV4_IFADDR, nlh, GFP_KERNEL);
1ce85fe4 1600 return;
d6062cbb
TG		 1601errout:
1602 if (err < 0)
4b8aa9ab 1603 rtnl_set_sk_err(net, RTNLGRP_IPV4_IFADDR, err);
1da177e4
LT		 1604}
1605
9f0f7272
TG		 1606static size_t inet_get_link_af_size(const struct net_device *dev)
1607{
1fc19aff 1608 struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr);
9f0f7272
TG		 1609
1610 if (!in_dev)
1611 return 0;
1612
1613 return nla_total_size(IPV4_DEVCONF_MAX * 4); /* IFLA_INET_CONF */
1614}
1615
1616static int inet_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
1617{
1fc19aff 1618 struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr);
9f0f7272
TG		 1619 struct nlattr *nla;
1620 int i;
1621
1622 if (!in_dev)
1623 return -ENODATA;
1624
1625 nla = nla_reserve(skb, IFLA_INET_CONF, IPV4_DEVCONF_MAX * 4);
1626 if (nla == NULL)
1627 return -EMSGSIZE;
1628
1629 for (i = 0; i < IPV4_DEVCONF_MAX; i++)
1630 ((u32 *) nla_data(nla))[i] = in_dev->cnf.data[i];
1631
1632 return 0;
1633}
1634
1635static const struct nla_policy inet_af_policy[IFLA_INET_MAX+1] = {
1636 [IFLA_INET_CONF] = { .type = NLA_NESTED },
1637};
1638
cf7afbfe
TG		 1639static int inet_validate_link_af(const struct net_device *dev,
1640 const struct nlattr *nla)
9f0f7272 1641{
9f0f7272
TG		 1642 struct nlattr *a, *tb[IFLA_INET_MAX+1];
1643 int err, rem;
1644
f7fce74e 1645 if (dev && !__in_dev_get_rtnl(dev))
cf7afbfe 1646 return -EAFNOSUPPORT;
9f0f7272
TG		 1647
1648 err = nla_parse_nested(tb, IFLA_INET_MAX, nla, inet_af_policy);
1649 if (err < 0)
1650 return err;
1651
1652 if (tb[IFLA_INET_CONF]) {
1653 nla_for_each_nested(a, tb[IFLA_INET_CONF], rem) {
1654 int cfgid = nla_type(a);
1655
1656 if (nla_len(a) < 4)
1657 return -EINVAL;
1658
1659 if (cfgid <= 0 || cfgid > IPV4_DEVCONF_MAX)
1660 return -EINVAL;
1661 }
1662 }
1663
cf7afbfe
TG		 1664 return 0;
1665}
1666
1667static int inet_set_link_af(struct net_device *dev, const struct nlattr *nla)
1668{
f7fce74e 1669 struct in_device *in_dev = __in_dev_get_rtnl(dev);
cf7afbfe
TG		 1670 struct nlattr *a, *tb[IFLA_INET_MAX+1];
1671 int rem;
1672
1673 if (!in_dev)
1674 return -EAFNOSUPPORT;
1675
1676 if (nla_parse_nested(tb, IFLA_INET_MAX, nla, NULL) < 0)
1677 BUG();
1678
9f0f7272
TG		 1679 if (tb[IFLA_INET_CONF]) {
1680 nla_for_each_nested(a, tb[IFLA_INET_CONF], rem)
1681 ipv4_devconf_set(in_dev, nla_type(a), nla_get_u32(a));
1682 }
1683
1684 return 0;
1685}
1686
edc9e748
ND		 1687static int inet_netconf_msgsize_devconf(int type)
1688{
1689 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
1690 + nla_total_size(4); /* NETCONFA_IFINDEX */
1691
9e551110
ND		 1692 /* type -1 is used for ALL */
1693 if (type == -1 || type == NETCONFA_FORWARDING)
edc9e748 1694 size += nla_total_size(4);
cc535dfb
ND		 1695 if (type == -1 || type == NETCONFA_RP_FILTER)
1696 size += nla_total_size(4);
d67b8c61
ND		 1697 if (type == -1 || type == NETCONFA_MC_FORWARDING)
1698 size += nla_total_size(4);
09aea5df 1699 if (type == -1 || type == NETCONFA_PROXY_NEIGH)
f085ff1c 1700 size += nla_total_size(4);
edc9e748
ND		 1701
1702 return size;
1703}
1704
1705static int inet_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
1706 struct ipv4_devconf *devconf, u32 portid,
1707 u32 seq, int event, unsigned int flags,
1708 int type)
1709{
1710 struct nlmsghdr *nlh;
1711 struct netconfmsg *ncm;
1712
1713 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
1714 flags);
1715 if (nlh == NULL)
1716 return -EMSGSIZE;
1717
1718 ncm = nlmsg_data(nlh);
1719 ncm->ncm_family = AF_INET;
1720
1721 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
1722 goto nla_put_failure;
1723
9e551110
ND		 1724 /* type -1 is used for ALL */
1725 if ((type == -1 || type == NETCONFA_FORWARDING) &&
edc9e748
ND		 1726 nla_put_s32(skb, NETCONFA_FORWARDING,
1727 IPV4_DEVCONF(*devconf, FORWARDING)) < 0)
1728 goto nla_put_failure;
cc535dfb
ND		 1729 if ((type == -1 || type == NETCONFA_RP_FILTER) &&
1730 nla_put_s32(skb, NETCONFA_RP_FILTER,
1731 IPV4_DEVCONF(*devconf, RP_FILTER)) < 0)
1732 goto nla_put_failure;
d67b8c61
ND		 1733 if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
1734 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
1735 IPV4_DEVCONF(*devconf, MC_FORWARDING)) < 0)
1736 goto nla_put_failure;
09aea5df 1737 if ((type == -1 || type == NETCONFA_PROXY_NEIGH) &&
1738 nla_put_s32(skb, NETCONFA_PROXY_NEIGH,
f085ff1c 1739 IPV4_DEVCONF(*devconf, PROXY_ARP)) < 0)
1740 goto nla_put_failure;
edc9e748
ND		 1741
1742 return nlmsg_end(skb, nlh);
1743
1744nla_put_failure:
1745 nlmsg_cancel(skb, nlh);
1746 return -EMSGSIZE;
1747}
1748
d67b8c61
ND		 1749void inet_netconf_notify_devconf(struct net *net, int type, int ifindex,
1750 struct ipv4_devconf *devconf)
edc9e748
ND		 1751{
1752 struct sk_buff *skb;
1753 int err = -ENOBUFS;
1754
1755 skb = nlmsg_new(inet_netconf_msgsize_devconf(type), GFP_ATOMIC);
1756 if (skb == NULL)
1757 goto errout;
1758
1759 err = inet_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
1760 RTM_NEWNETCONF, 0, type);
1761 if (err < 0) {
1762 /* -EMSGSIZE implies BUG in inet_netconf_msgsize_devconf() */
1763 WARN_ON(err == -EMSGSIZE);
1764 kfree_skb(skb);
1765 goto errout;
1766 }
1767 rtnl_notify(skb, net, 0, RTNLGRP_IPV4_NETCONF, NULL, GFP_ATOMIC);
1768 return;
1769errout:
1770 if (err < 0)
1771 rtnl_set_sk_err(net, RTNLGRP_IPV4_NETCONF, err);
1772}
1773
9e551110
ND		 1774static const struct nla_policy devconf_ipv4_policy[NETCONFA_MAX+1] = {
1775 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
1776 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
cc535dfb 1777 [NETCONFA_RP_FILTER] = { .len = sizeof(int) },
09aea5df 1778 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
9e551110
ND		 1779};
1780
1781static int inet_netconf_get_devconf(struct sk_buff *in_skb,
661d2967 1782 struct nlmsghdr *nlh)
9e551110
ND		 1783{
1784 struct net *net = sock_net(in_skb->sk);
1785 struct nlattr *tb[NETCONFA_MAX+1];
1786 struct netconfmsg *ncm;
1787 struct sk_buff *skb;
1788 struct ipv4_devconf *devconf;
1789 struct in_device *in_dev;
1790 struct net_device *dev;
1791 int ifindex;
1792 int err;
1793
1794 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
1795 devconf_ipv4_policy);
1796 if (err < 0)
1797 goto errout;
1798
1799 err = EINVAL;
1800 if (!tb[NETCONFA_IFINDEX])
1801 goto errout;
1802
1803 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
1804 switch (ifindex) {
1805 case NETCONFA_IFINDEX_ALL:
1806 devconf = net->ipv4.devconf_all;
1807 break;
1808 case NETCONFA_IFINDEX_DEFAULT:
1809 devconf = net->ipv4.devconf_dflt;
1810 break;
1811 default:
1812 dev = __dev_get_by_index(net, ifindex);
1813 if (dev == NULL)
1814 goto errout;
1815 in_dev = __in_dev_get_rtnl(dev);
1816 if (in_dev == NULL)
1817 goto errout;
1818 devconf = &in_dev->cnf;
1819 break;
1820 }
1821
1822 err = -ENOBUFS;
1823 skb = nlmsg_new(inet_netconf_msgsize_devconf(-1), GFP_ATOMIC);
1824 if (skb == NULL)
1825 goto errout;
1826
1827 err = inet_netconf_fill_devconf(skb, ifindex, devconf,
1828 NETLINK_CB(in_skb).portid,
1829 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
1830 -1);
1831 if (err < 0) {
1832 /* -EMSGSIZE implies BUG in inet_netconf_msgsize_devconf() */
1833 WARN_ON(err == -EMSGSIZE);
1834 kfree_skb(skb);
1835 goto errout;
1836 }
1837 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
1838errout:
1839 return err;
1840}
1841
7a674200
ND		 1842static int inet_netconf_dump_devconf(struct sk_buff *skb,
1843 struct netlink_callback *cb)
1844{
1845 struct net *net = sock_net(skb->sk);
1846 int h, s_h;
1847 int idx, s_idx;
1848 struct net_device *dev;
1849 struct in_device *in_dev;
1850 struct hlist_head *head;
1851
1852 s_h = cb->args[0];
1853 s_idx = idx = cb->args[1];
1854
1855 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1856 idx = 0;
1857 head = &net->dev_index_head[h];
1858 rcu_read_lock();
0465277f
ND		 1859 cb->seq = atomic_read(&net->ipv4.dev_addr_genid) ^
1860 net->dev_base_seq;
7a674200
ND		 1861 hlist_for_each_entry_rcu(dev, head, index_hlist) {
1862 if (idx < s_idx)
1863 goto cont;
1864 in_dev = __in_dev_get_rcu(dev);
1865 if (!in_dev)
1866 goto cont;
1867
1868 if (inet_netconf_fill_devconf(skb, dev->ifindex,
1869 &in_dev->cnf,
1870 NETLINK_CB(cb->skb).portid,
1871 cb->nlh->nlmsg_seq,
1872 RTM_NEWNETCONF,
1873 NLM_F_MULTI,
1874 -1) <= 0) {
1875 rcu_read_unlock();
1876 goto done;
1877 }
0465277f 1878 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7a674200
ND		 1879cont:
1880 idx++;
1881 }
1882 rcu_read_unlock();
1883 }
1884 if (h == NETDEV_HASHENTRIES) {
1885 if (inet_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
1886 net->ipv4.devconf_all,
1887 NETLINK_CB(cb->skb).portid,
1888 cb->nlh->nlmsg_seq,
1889 RTM_NEWNETCONF, NLM_F_MULTI,
1890 -1) <= 0)
1891 goto done;
1892 else
1893 h++;
1894 }
1895 if (h == NETDEV_HASHENTRIES + 1) {
1896 if (inet_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
1897 net->ipv4.devconf_dflt,
1898 NETLINK_CB(cb->skb).portid,
1899 cb->nlh->nlmsg_seq,
1900 RTM_NEWNETCONF, NLM_F_MULTI,
1901 -1) <= 0)
1902 goto done;
1903 else
1904 h++;
1905 }
1906done:
1907 cb->args[0] = h;
1908 cb->args[1] = idx;
1909
1910 return skb->len;
1911}
1912
1da177e4
LT		 1913#ifdef CONFIG_SYSCTL
1914
c0ce9fb3 1915static void devinet_copy_dflt_conf(struct net *net, int i)
31be3085
HX		 1916{
1917 struct net_device *dev;
1918
c6d14c84
ED		 1919 rcu_read_lock();
1920 for_each_netdev_rcu(net, dev) {
31be3085 1921 struct in_device *in_dev;
c6d14c84 1922
31be3085
HX		 1923 in_dev = __in_dev_get_rcu(dev);
1924 if (in_dev && !test_bit(i, in_dev->cnf.state))
9355bbd6 1925 in_dev->cnf.data[i] = net->ipv4.devconf_dflt->data[i];
31be3085 1926 }
c6d14c84 1927 rcu_read_unlock();
31be3085
HX		 1928}
1929
c6d14c84 1930/* called with RTNL locked */
c0ce9fb3 1931static void inet_forward_change(struct net *net)
68dd299b
PE		 1932{
1933 struct net_device *dev;
586f1211 1934 int on = IPV4_DEVCONF_ALL(net, FORWARDING);
68dd299b 1935
586f1211 1936 IPV4_DEVCONF_ALL(net, ACCEPT_REDIRECTS) = !on;
9355bbd6 1937 IPV4_DEVCONF_DFLT(net, FORWARDING) = on;
edc9e748
ND		 1938 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING,
1939 NETCONFA_IFINDEX_ALL,
1940 net->ipv4.devconf_all);
1941 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING,
1942 NETCONFA_IFINDEX_DEFAULT,
1943 net->ipv4.devconf_dflt);
68dd299b 1944
c0ce9fb3 1945 for_each_netdev(net, dev) {
68dd299b 1946 struct in_device *in_dev;
0187bdfb
BH		 1947 if (on)
1948 dev_disable_lro(dev);
68dd299b
PE		 1949 rcu_read_lock();
1950 in_dev = __in_dev_get_rcu(dev);
edc9e748 1951 if (in_dev) {
68dd299b 1952 IN_DEV_CONF_SET(in_dev, FORWARDING, on);
edc9e748
ND		 1953 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING,
1954 dev->ifindex, &in_dev->cnf);
1955 }
68dd299b
PE		 1956 rcu_read_unlock();
1957 }
68dd299b
PE		 1958}
1959
f085ff1c 1960static int devinet_conf_ifindex(struct net *net, struct ipv4_devconf *cnf)
1961{
1962 if (cnf == net->ipv4.devconf_dflt)
1963 return NETCONFA_IFINDEX_DEFAULT;
1964 else if (cnf == net->ipv4.devconf_all)
1965 return NETCONFA_IFINDEX_ALL;
1966 else {
1967 struct in_device *idev
1968 = container_of(cnf, struct in_device, cnf);
1969 return idev->dev->ifindex;
1970 }
1971}
1972
fe2c6338 1973static int devinet_conf_proc(struct ctl_table *ctl, int write,
8d65af78 1974 void __user *buffer,
31be3085
HX		 1975 size_t *lenp, loff_t *ppos)
1976{
d01ff0a0 1977 int old_value = *(int *)ctl->data;
8d65af78 1978 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
d01ff0a0 1979 int new_value = *(int *)ctl->data;
31be3085
HX		 1980
1981 if (write) {
1982 struct ipv4_devconf *cnf = ctl->extra1;
c0ce9fb3 1983 struct net *net = ctl->extra2;
31be3085 1984 int i = (int *)ctl->data - cnf->data;
f085ff1c 1985 int ifindex;
31be3085
HX		 1986
1987 set_bit(i, cnf->state);
1988
9355bbd6 1989 if (cnf == net->ipv4.devconf_dflt)
c0ce9fb3 1990 devinet_copy_dflt_conf(net, i);
d0daebc3
TG		 1991 if (i == IPV4_DEVCONF_ACCEPT_LOCAL - 1 ||
1992 i == IPV4_DEVCONF_ROUTE_LOCALNET - 1)
d01ff0a0 1993 if ((new_value == 0) && (old_value != 0))
4ccfe6d4 1994 rt_cache_flush(net);
f085ff1c 1995
cc535dfb
ND		 1996 if (i == IPV4_DEVCONF_RP_FILTER - 1 &&
1997 new_value != old_value) {
f085ff1c 1998 ifindex = devinet_conf_ifindex(net, cnf);
cc535dfb
ND		 1999 inet_netconf_notify_devconf(net, NETCONFA_RP_FILTER,
2000 ifindex, cnf);
2001 }
f085ff1c 2002 if (i == IPV4_DEVCONF_PROXY_ARP - 1 &&
2003 new_value != old_value) {
2004 ifindex = devinet_conf_ifindex(net, cnf);
09aea5df 2005 inet_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
f085ff1c 2006 ifindex, cnf);
2007 }
31be3085
HX		 2008 }
2009
2010 return ret;
2011}
2012
fe2c6338 2013static int devinet_sysctl_forward(struct ctl_table *ctl, int write,
8d65af78 2014 void __user *buffer,
1da177e4
LT		 2015 size_t *lenp, loff_t *ppos)
2016{
2017 int *valp = ctl->data;
2018 int val = *valp;
88af182e 2019 loff_t pos = *ppos;
8d65af78 2020 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
1da177e4
LT		 2021
2022 if (write && *valp != val) {
c0ce9fb3
PE		 2023 struct net *net = ctl->extra2;
2024
0187bdfb 2025 if (valp != &IPV4_DEVCONF_DFLT(net, FORWARDING)) {
88af182e
EB		 2026 if (!rtnl_trylock()) {
2027 /* Restore the original values before restarting */
2028 *valp = val;
2029 *ppos = pos;
9b8adb5e 2030 return restart_syscall();
88af182e 2031 }
0187bdfb
BH		 2032 if (valp == &IPV4_DEVCONF_ALL(net, FORWARDING)) {
2033 inet_forward_change(net);
edc9e748 2034 } else {
0187bdfb
BH		 2035 struct ipv4_devconf *cnf = ctl->extra1;
2036 struct in_device *idev =
2037 container_of(cnf, struct in_device, cnf);
edc9e748
ND		 2038 if (*valp)
2039 dev_disable_lro(idev->dev);
2040 inet_netconf_notify_devconf(net,
2041 NETCONFA_FORWARDING,
2042 idev->dev->ifindex,
2043 cnf);
0187bdfb
BH		 2044 }
2045 rtnl_unlock();
4ccfe6d4 2046 rt_cache_flush(net);
edc9e748
ND		 2047 } else
2048 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING,
2049 NETCONFA_IFINDEX_DEFAULT,
2050 net->ipv4.devconf_dflt);
1da177e4
LT		 2051 }
2052
2053 return ret;
2054}
2055
fe2c6338 2056static int ipv4_doint_and_flush(struct ctl_table *ctl, int write,
323e126f
DM		 2057 void __user *buffer,
2058 size_t *lenp, loff_t *ppos)
1da177e4
LT		 2059{
2060 int *valp = ctl->data;
2061 int val = *valp;
8d65af78 2062 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
76e6ebfb 2063 struct net *net = ctl->extra2;
1da177e4
LT		 2064
2065 if (write && *valp != val)
4ccfe6d4 2066 rt_cache_flush(net);
1da177e4
LT		 2067
2068 return ret;
2069}
2070
f8572d8f 2071#define DEVINET_SYSCTL_ENTRY(attr, name, mval, proc) \
42f811b8 2072 { \
42f811b8
HX		 2073 .procname = name, \
2074 .data = ipv4_devconf.data + \
02291680 2075 IPV4_DEVCONF_ ## attr - 1, \
42f811b8
HX		 2076 .maxlen = sizeof(int), \
2077 .mode = mval, \
2078 .proc_handler = proc, \
31be3085 2079 .extra1 = &ipv4_devconf, \
42f811b8
HX		 2080 }
2081
2082#define DEVINET_SYSCTL_RW_ENTRY(attr, name) \
f8572d8f 2083 DEVINET_SYSCTL_ENTRY(attr, name, 0644, devinet_conf_proc)
42f811b8
HX		 2084
2085#define DEVINET_SYSCTL_RO_ENTRY(attr, name) \
f8572d8f 2086 DEVINET_SYSCTL_ENTRY(attr, name, 0444, devinet_conf_proc)
42f811b8 2087
f8572d8f
EB		 2088#define DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, proc) \
2089 DEVINET_SYSCTL_ENTRY(attr, name, 0644, proc)
42f811b8
HX		 2090
2091#define DEVINET_SYSCTL_FLUSHING_ENTRY(attr, name) \
f8572d8f 2092 DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, ipv4_doint_and_flush)
42f811b8 2093
1da177e4
LT		 2094static struct devinet_sysctl_table {
2095 struct ctl_table_header *sysctl_header;
02291680 2096 struct ctl_table devinet_vars[__IPV4_DEVCONF_MAX];
1da177e4
LT		 2097} devinet_sysctl = {
2098 .devinet_vars = {
42f811b8 2099 DEVINET_SYSCTL_COMPLEX_ENTRY(FORWARDING, "forwarding",
f8572d8f 2100 devinet_sysctl_forward),
42f811b8
HX		 2101 DEVINET_SYSCTL_RO_ENTRY(MC_FORWARDING, "mc_forwarding"),
2102
2103 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_REDIRECTS, "accept_redirects"),
2104 DEVINET_SYSCTL_RW_ENTRY(SECURE_REDIRECTS, "secure_redirects"),
2105 DEVINET_SYSCTL_RW_ENTRY(SHARED_MEDIA, "shared_media"),
2106 DEVINET_SYSCTL_RW_ENTRY(RP_FILTER, "rp_filter"),
2107 DEVINET_SYSCTL_RW_ENTRY(SEND_REDIRECTS, "send_redirects"),
2108 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_SOURCE_ROUTE,
2109 "accept_source_route"),
8153a10c 2110 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_LOCAL, "accept_local"),
28f6aeea 2111 DEVINET_SYSCTL_RW_ENTRY(SRC_VMARK, "src_valid_mark"),
42f811b8
HX		 2112 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP, "proxy_arp"),
2113 DEVINET_SYSCTL_RW_ENTRY(MEDIUM_ID, "medium_id"),
2114 DEVINET_SYSCTL_RW_ENTRY(BOOTP_RELAY, "bootp_relay"),
2115 DEVINET_SYSCTL_RW_ENTRY(LOG_MARTIANS, "log_martians"),
2116 DEVINET_SYSCTL_RW_ENTRY(TAG, "tag"),
2117 DEVINET_SYSCTL_RW_ENTRY(ARPFILTER, "arp_filter"),
2118 DEVINET_SYSCTL_RW_ENTRY(ARP_ANNOUNCE, "arp_announce"),
2119 DEVINET_SYSCTL_RW_ENTRY(ARP_IGNORE, "arp_ignore"),
2120 DEVINET_SYSCTL_RW_ENTRY(ARP_ACCEPT, "arp_accept"),
eefef1cf 2121 DEVINET_SYSCTL_RW_ENTRY(ARP_NOTIFY, "arp_notify"),
65324144 2122 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP_PVLAN, "proxy_arp_pvlan"),
5c6fe01c
WM		 2123 DEVINET_SYSCTL_RW_ENTRY(FORCE_IGMP_VERSION,
2124 "force_igmp_version"),
2690048c
WM		 2125 DEVINET_SYSCTL_RW_ENTRY(IGMPV2_UNSOLICITED_REPORT_INTERVAL,
2126 "igmpv2_unsolicited_report_interval"),
2127 DEVINET_SYSCTL_RW_ENTRY(IGMPV3_UNSOLICITED_REPORT_INTERVAL,
2128 "igmpv3_unsolicited_report_interval"),
42f811b8
HX		 2129
2130 DEVINET_SYSCTL_FLUSHING_ENTRY(NOXFRM, "disable_xfrm"),
2131 DEVINET_SYSCTL_FLUSHING_ENTRY(NOPOLICY, "disable_policy"),
42f811b8
HX		 2132 DEVINET_SYSCTL_FLUSHING_ENTRY(PROMOTE_SECONDARIES,
2133 "promote_secondaries"),
d0daebc3
TG		 2134 DEVINET_SYSCTL_FLUSHING_ENTRY(ROUTE_LOCALNET,
2135 "route_localnet"),
1da177e4 2136 },
1da177e4
LT		 2137};
2138
ea40b324 2139static int __devinet_sysctl_register(struct net *net, char *dev_name,
f8572d8f 2140 struct ipv4_devconf *p)
1da177e4
LT		 2141{
2142 int i;
9fa89642 2143 struct devinet_sysctl_table *t;
8607ddb8 2144 char path[sizeof("net/ipv4/conf/") + IFNAMSIZ];
bfada697 2145
9fa89642 2146 t = kmemdup(&devinet_sysctl, sizeof(*t), GFP_KERNEL);
1da177e4 2147 if (!t)
9fa89642
PE		 2148 goto out;
2149
1da177e4
LT		 2150 for (i = 0; i < ARRAY_SIZE(t->devinet_vars) - 1; i++) {
2151 t->devinet_vars[i].data += (char *)p - (char *)&ipv4_devconf;
31be3085 2152 t->devinet_vars[i].extra1 = p;
c0ce9fb3 2153 t->devinet_vars[i].extra2 = net;
1da177e4
LT		 2154 }
2155
8607ddb8 2156 snprintf(path, sizeof(path), "net/ipv4/conf/%s", dev_name);
1da177e4 2157
8607ddb8 2158 t->sysctl_header = register_net_sysctl(net, path, t->devinet_vars);
1da177e4 2159 if (!t->sysctl_header)
8607ddb8 2160 goto free;
1da177e4
LT		 2161
2162 p->sysctl = t;
ea40b324 2163 return 0;
1da177e4 2164
9fa89642 2165free:
1da177e4 2166 kfree(t);
9fa89642 2167out:
ea40b324 2168 return -ENOBUFS;
1da177e4
LT		 2169}
2170
51602b2a
PE		 2171static void __devinet_sysctl_unregister(struct ipv4_devconf *cnf)
2172{
2173 struct devinet_sysctl_table *t = cnf->sysctl;
2174
2175 if (t == NULL)
2176 return;
2177
2178 cnf->sysctl = NULL;
ff538818 2179 unregister_net_sysctl_table(t->sysctl_header);
51602b2a
PE		 2180 kfree(t);
2181}
2182
66f27a52
PE		 2183static void devinet_sysctl_register(struct in_device *idev)
2184{
73af614a 2185 neigh_sysctl_register(idev->dev, idev->arp_parms, NULL);
c346dca1 2186 __devinet_sysctl_register(dev_net(idev->dev), idev->dev->name,
f8572d8f 2187 &idev->cnf);
66f27a52
PE		 2188}
2189
51602b2a 2190static void devinet_sysctl_unregister(struct in_device *idev)
1da177e4 2191{
51602b2a
PE		 2192 __devinet_sysctl_unregister(&idev->cnf);
2193 neigh_sysctl_unregister(idev->arp_parms);
1da177e4 2194}
1da177e4 2195
68dd299b
PE		 2196static struct ctl_table ctl_forward_entry[] = {
2197 {
68dd299b
PE		 2198 .procname = "ip_forward",
2199 .data = &ipv4_devconf.data[
02291680 2200 IPV4_DEVCONF_FORWARDING - 1],
68dd299b
PE		 2201 .maxlen = sizeof(int),
2202 .mode = 0644,
2203 .proc_handler = devinet_sysctl_forward,
68dd299b 2204 .extra1 = &ipv4_devconf,
c0ce9fb3 2205 .extra2 = &init_net,
68dd299b
PE		 2206 },
2207 { },
2208};
2a75de0c 2209#endif
68dd299b 2210
752d14dc
PE		 2211static __net_init int devinet_init_net(struct net *net)
2212{
2213 int err;
752d14dc 2214 struct ipv4_devconf *all, *dflt;
2a75de0c
ED		 2215#ifdef CONFIG_SYSCTL
2216 struct ctl_table *tbl = ctl_forward_entry;
752d14dc 2217 struct ctl_table_header *forw_hdr;
2a75de0c 2218#endif
752d14dc
PE		 2219
2220 err = -ENOMEM;
2221 all = &ipv4_devconf;
2222 dflt = &ipv4_devconf_dflt;
752d14dc 2223
09ad9bc7 2224 if (!net_eq(net, &init_net)) {
752d14dc
PE		 2225 all = kmemdup(all, sizeof(ipv4_devconf), GFP_KERNEL);
2226 if (all == NULL)
2227 goto err_alloc_all;
2228
2229 dflt = kmemdup(dflt, sizeof(ipv4_devconf_dflt), GFP_KERNEL);
2230 if (dflt == NULL)
2231 goto err_alloc_dflt;
2232
2a75de0c 2233#ifdef CONFIG_SYSCTL
752d14dc
PE		 2234 tbl = kmemdup(tbl, sizeof(ctl_forward_entry), GFP_KERNEL);
2235 if (tbl == NULL)
2236 goto err_alloc_ctl;
2237
02291680 2238 tbl[0].data = &all->data[IPV4_DEVCONF_FORWARDING - 1];
752d14dc
PE		 2239 tbl[0].extra1 = all;
2240 tbl[0].extra2 = net;
2a75de0c 2241#endif
752d14dc
PE		 2242 }
2243
2244#ifdef CONFIG_SYSCTL
f8572d8f 2245 err = __devinet_sysctl_register(net, "all", all);
752d14dc
PE		 2246 if (err < 0)
2247 goto err_reg_all;
2248
f8572d8f 2249 err = __devinet_sysctl_register(net, "default", dflt);
752d14dc
PE		 2250 if (err < 0)
2251 goto err_reg_dflt;
2252
2253 err = -ENOMEM;
8607ddb8 2254 forw_hdr = register_net_sysctl(net, "net/ipv4", tbl);
752d14dc
PE		 2255 if (forw_hdr == NULL)
2256 goto err_reg_ctl;
2a75de0c 2257 net->ipv4.forw_hdr = forw_hdr;
752d14dc
PE		 2258#endif
2259
752d14dc
PE		 2260 net->ipv4.devconf_all = all;
2261 net->ipv4.devconf_dflt = dflt;
2262 return 0;
2263
2264#ifdef CONFIG_SYSCTL
2265err_reg_ctl:
2266 __devinet_sysctl_unregister(dflt);
2267err_reg_dflt:
2268 __devinet_sysctl_unregister(all);
2269err_reg_all:
2270 if (tbl != ctl_forward_entry)
2271 kfree(tbl);
752d14dc 2272err_alloc_ctl:
2a75de0c 2273#endif
752d14dc
PE		 2274 if (dflt != &ipv4_devconf_dflt)
2275 kfree(dflt);
2276err_alloc_dflt:
2277 if (all != &ipv4_devconf)
2278 kfree(all);
2279err_alloc_all:
2280 return err;
2281}
2282
2283static __net_exit void devinet_exit_net(struct net *net)
2284{
2a75de0c 2285#ifdef CONFIG_SYSCTL
752d14dc
PE		 2286 struct ctl_table *tbl;
2287
2288 tbl = net->ipv4.forw_hdr->ctl_table_arg;
752d14dc
PE		 2289 unregister_net_sysctl_table(net->ipv4.forw_hdr);
2290 __devinet_sysctl_unregister(net->ipv4.devconf_dflt);
2291 __devinet_sysctl_unregister(net->ipv4.devconf_all);
752d14dc 2292 kfree(tbl);
2a75de0c 2293#endif
752d14dc
PE		 2294 kfree(net->ipv4.devconf_dflt);
2295 kfree(net->ipv4.devconf_all);
2296}
2297
2298static __net_initdata struct pernet_operations devinet_ops = {
2299 .init = devinet_init_net,
2300 .exit = devinet_exit_net,
2301};
2302
9f0f7272
TG		 2303static struct rtnl_af_ops inet_af_ops = {
2304 .family = AF_INET,
2305 .fill_link_af = inet_fill_link_af,
2306 .get_link_af_size = inet_get_link_af_size,
cf7afbfe
TG		 2307 .validate_link_af = inet_validate_link_af,
2308 .set_link_af = inet_set_link_af,
9f0f7272
TG		 2309};
2310
1da177e4
LT		 2311void __init devinet_init(void)
2312{
fd23c3b3
DM		 2313 int i;
2314
2315 for (i = 0; i < IN4_ADDR_HSIZE; i++)
2316 INIT_HLIST_HEAD(&inet_addr_lst[i]);
2317
752d14dc
PE		 2318 register_pernet_subsys(&devinet_ops);
2319
1da177e4
LT		 2320 register_gifconf(PF_INET, inet_gifconf);
2321 register_netdevice_notifier(&ip_netdev_notifier);
63f3444f 2322
5c766d64
JP		 2323 schedule_delayed_work(&check_lifetime_work, 0);
2324
9f0f7272
TG		 2325 rtnl_af_register(&inet_af_ops);
2326
c7ac8679
GR		 2327 rtnl_register(PF_INET, RTM_NEWADDR, inet_rtm_newaddr, NULL, NULL);
2328 rtnl_register(PF_INET, RTM_DELADDR, inet_rtm_deladdr, NULL, NULL);
2329 rtnl_register(PF_INET, RTM_GETADDR, NULL, inet_dump_ifaddr, NULL);
9e551110 2330 rtnl_register(PF_INET, RTM_GETNETCONF, inet_netconf_get_devconf,
7a674200 2331 inet_netconf_dump_devconf, NULL);
1da177e4
LT		 2332}
2333
ubuntu-bionic-kernel mirror