blob: 2e667e2f90df2e3c97845e7eee59cabd180c55de [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * NET3 IP device support routines.
3 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07004 * 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
Jesper Juhl02c30a82005-05-05 16:16:16 -070010 * Authors: Ross Biro
Linus Torvalds1da177e2005-04-16 15:20:36 -070011 * 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070028
29#include <asm/uaccess.h>
30#include <asm/system.h>
31#include <linux/bitops.h>
Randy Dunlap4fc268d2006-01-11 12:17:47 -080032#include <linux/capability.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070033#include <linux/module.h>
34#include <linux/types.h>
35#include <linux/kernel.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070036#include <linux/string.h>
37#include <linux/mm.h>
38#include <linux/socket.h>
39#include <linux/sockios.h>
40#include <linux/in.h>
41#include <linux/errno.h>
42#include <linux/interrupt.h>
Thomas Graf18237302006-08-04 23:04:54 -070043#include <linux/if_addr.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070044#include <linux/if_ether.h>
45#include <linux/inet.h>
46#include <linux/netdevice.h>
47#include <linux/etherdevice.h>
48#include <linux/skbuff.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070049#include <linux/init.h>
50#include <linux/notifier.h>
51#include <linux/inetdevice.h>
52#include <linux/igmp.h>
53#ifdef CONFIG_SYSCTL
54#include <linux/sysctl.h>
55#endif
56#include <linux/kmod.h>
57
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020058#include <net/arp.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070059#include <net/ip.h>
60#include <net/route.h>
61#include <net/ip_fib.h>
Thomas Graf63f34442007-03-22 11:55:17 -070062#include <net/rtnetlink.h>
Pavel Emelyanov752d14d2007-12-16 13:31:47 -080063#include <net/net_namespace.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070064
Adrian Bunk0027ba82008-01-31 17:17:31 -080065static struct ipv4_devconf ipv4_devconf = {
Herbert Xu42f811b2007-06-04 23:34:44 -070066 .data = {
67 [NET_IPV4_CONF_ACCEPT_REDIRECTS - 1] = 1,
68 [NET_IPV4_CONF_SEND_REDIRECTS - 1] = 1,
69 [NET_IPV4_CONF_SECURE_REDIRECTS - 1] = 1,
70 [NET_IPV4_CONF_SHARED_MEDIA - 1] = 1,
71 },
Linus Torvalds1da177e2005-04-16 15:20:36 -070072};
73
74static struct ipv4_devconf ipv4_devconf_dflt = {
Herbert Xu42f811b2007-06-04 23:34:44 -070075 .data = {
76 [NET_IPV4_CONF_ACCEPT_REDIRECTS - 1] = 1,
77 [NET_IPV4_CONF_SEND_REDIRECTS - 1] = 1,
78 [NET_IPV4_CONF_SECURE_REDIRECTS - 1] = 1,
79 [NET_IPV4_CONF_SHARED_MEDIA - 1] = 1,
80 [NET_IPV4_CONF_ACCEPT_SOURCE_ROUTE - 1] = 1,
81 },
Linus Torvalds1da177e2005-04-16 15:20:36 -070082};
83
Pavel Emelyanov9355bbd2007-12-16 13:32:16 -080084#define IPV4_DEVCONF_DFLT(net, attr) \
85 IPV4_DEVCONF((*net->ipv4.devconf_dflt), attr)
Herbert Xu42f811b2007-06-04 23:34:44 -070086
Patrick McHardyef7c79e2007-06-05 12:38:30 -070087static const struct nla_policy ifa_ipv4_policy[IFA_MAX+1] = {
Thomas Graf5c753972006-08-04 23:03:53 -070088 [IFA_LOCAL] = { .type = NLA_U32 },
89 [IFA_ADDRESS] = { .type = NLA_U32 },
90 [IFA_BROADCAST] = { .type = NLA_U32 },
Thomas Graf5176f912006-08-26 20:13:18 -070091 [IFA_LABEL] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 },
Thomas Graf5c753972006-08-04 23:03:53 -070092};
93
Thomas Grafd6062cb2006-08-15 00:33:59 -070094static void rtmsg_ifa(int event, struct in_ifaddr *, struct nlmsghdr *, u32);
Linus Torvalds1da177e2005-04-16 15:20:36 -070095
Alan Sterne041c682006-03-27 01:16:30 -080096static BLOCKING_NOTIFIER_HEAD(inetaddr_chain);
Linus Torvalds1da177e2005-04-16 15:20:36 -070097static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
98 int destroy);
99#ifdef CONFIG_SYSCTL
Pavel Emelyanov66f27a52007-12-02 00:55:54 +1100100static void devinet_sysctl_register(struct in_device *idev);
Pavel Emelyanov51602b22007-12-11 02:17:40 -0800101static void devinet_sysctl_unregister(struct in_device *idev);
102#else
103static inline void devinet_sysctl_register(struct in_device *idev)
104{
105}
106static inline void devinet_sysctl_unregister(struct in_device *idev)
107{
108}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109#endif
110
111/* Locks all the inet devices. */
112
113static struct in_ifaddr *inet_alloc_ifa(void)
114{
Panagiotis Issaris0da974f2006-07-21 14:51:30 -0700115 struct in_ifaddr *ifa = kzalloc(sizeof(*ifa), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116
117 if (ifa) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118 INIT_RCU_HEAD(&ifa->rcu_head);
119 }
120
121 return ifa;
122}
123
124static void inet_rcu_free_ifa(struct rcu_head *head)
125{
126 struct in_ifaddr *ifa = container_of(head, struct in_ifaddr, rcu_head);
127 if (ifa->ifa_dev)
128 in_dev_put(ifa->ifa_dev);
129 kfree(ifa);
130}
131
132static inline void inet_free_ifa(struct in_ifaddr *ifa)
133{
134 call_rcu(&ifa->rcu_head, inet_rcu_free_ifa);
135}
136
137void in_dev_finish_destroy(struct in_device *idev)
138{
139 struct net_device *dev = idev->dev;
140
141 BUG_TRAP(!idev->ifa_list);
142 BUG_TRAP(!idev->mc_list);
143#ifdef NET_REFCNT_DEBUG
144 printk(KERN_DEBUG "in_dev_finish_destroy: %p=%s\n",
145 idev, dev ? dev->name : "NIL");
146#endif
147 dev_put(dev);
148 if (!idev->dead)
149 printk("Freeing alive in_device %p\n", idev);
150 else {
151 kfree(idev);
152 }
153}
154
Herbert Xu71e27da2007-06-04 23:36:06 -0700155static struct in_device *inetdev_init(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156{
157 struct in_device *in_dev;
158
159 ASSERT_RTNL();
160
Panagiotis Issaris0da974f2006-07-21 14:51:30 -0700161 in_dev = kzalloc(sizeof(*in_dev), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162 if (!in_dev)
163 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 INIT_RCU_HEAD(&in_dev->rcu_head);
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +0900165 memcpy(&in_dev->cnf, dev_net(dev)->ipv4.devconf_dflt,
Pavel Emelyanov9355bbd2007-12-16 13:32:16 -0800166 sizeof(in_dev->cnf));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167 in_dev->cnf.sysctl = NULL;
168 in_dev->dev = dev;
169 if ((in_dev->arp_parms = neigh_parms_alloc(dev, &arp_tbl)) == NULL)
170 goto out_kfree;
Ben Hutchings0187bdf2008-06-19 16:15:47 -0700171 if (IPV4_DEVCONF(in_dev->cnf, FORWARDING))
172 dev_disable_lro(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173 /* Reference in_dev->dev */
174 dev_hold(dev);
David L Stevens30c4cf52007-01-04 12:31:14 -0800175 /* Account for reference dev->ip_ptr (below) */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176 in_dev_hold(in_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177
Pavel Emelyanov66f27a52007-12-02 00:55:54 +1100178 devinet_sysctl_register(in_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179 ip_mc_init_dev(in_dev);
180 if (dev->flags & IFF_UP)
181 ip_mc_up(in_dev);
Jarek Poplawski483479e2007-01-09 14:38:31 -0800182
David L Stevens30c4cf52007-01-04 12:31:14 -0800183 /* we can receive as soon as ip_ptr is set -- do this last */
184 rcu_assign_pointer(dev->ip_ptr, in_dev);
Jarek Poplawski483479e2007-01-09 14:38:31 -0800185out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186 return in_dev;
187out_kfree:
188 kfree(in_dev);
189 in_dev = NULL;
190 goto out;
191}
192
193static void in_dev_rcu_put(struct rcu_head *head)
194{
195 struct in_device *idev = container_of(head, struct in_device, rcu_head);
196 in_dev_put(idev);
197}
198
199static void inetdev_destroy(struct in_device *in_dev)
200{
201 struct in_ifaddr *ifa;
202 struct net_device *dev;
203
204 ASSERT_RTNL();
205
206 dev = in_dev->dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207
208 in_dev->dead = 1;
209
210 ip_mc_destroy_dev(in_dev);
211
212 while ((ifa = in_dev->ifa_list) != NULL) {
213 inet_del_ifa(in_dev, &in_dev->ifa_list, 0);
214 inet_free_ifa(ifa);
215 }
216
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217 dev->ip_ptr = NULL;
218
Pavel Emelyanov51602b22007-12-11 02:17:40 -0800219 devinet_sysctl_unregister(in_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220 neigh_parms_release(&arp_tbl, in_dev->arp_parms);
221 arp_ifdown(dev);
222
223 call_rcu(&in_dev->rcu_head, in_dev_rcu_put);
224}
225
Al Viroff428d72006-09-26 22:13:35 -0700226int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227{
228 rcu_read_lock();
229 for_primary_ifa(in_dev) {
230 if (inet_ifa_match(a, ifa)) {
231 if (!b || inet_ifa_match(b, ifa)) {
232 rcu_read_unlock();
233 return 1;
234 }
235 }
236 } endfor_ifa(in_dev);
237 rcu_read_unlock();
238 return 0;
239}
240
Thomas Grafd6062cb2006-08-15 00:33:59 -0700241static void __inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
242 int destroy, struct nlmsghdr *nlh, u32 pid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243{
Harald Welte8f937c62005-05-29 20:23:46 -0700244 struct in_ifaddr *promote = NULL;
Jamal Hadi Salim0ff60a42005-11-22 14:47:37 -0800245 struct in_ifaddr *ifa, *ifa1 = *ifap;
246 struct in_ifaddr *last_prim = in_dev->ifa_list;
247 struct in_ifaddr *prev_prom = NULL;
248 int do_promote = IN_DEV_PROMOTE_SECONDARIES(in_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249
250 ASSERT_RTNL();
251
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900252 /* 1. Deleting primary ifaddr forces deletion all secondaries
Harald Welte8f937c62005-05-29 20:23:46 -0700253 * unless alias promotion is set
254 **/
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255
256 if (!(ifa1->ifa_flags & IFA_F_SECONDARY)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257 struct in_ifaddr **ifap1 = &ifa1->ifa_next;
258
259 while ((ifa = *ifap1) != NULL) {
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900260 if (!(ifa->ifa_flags & IFA_F_SECONDARY) &&
Jamal Hadi Salim0ff60a42005-11-22 14:47:37 -0800261 ifa1->ifa_scope <= ifa->ifa_scope)
262 last_prim = ifa;
263
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264 if (!(ifa->ifa_flags & IFA_F_SECONDARY) ||
265 ifa1->ifa_mask != ifa->ifa_mask ||
266 !inet_ifa_match(ifa1->ifa_address, ifa)) {
267 ifap1 = &ifa->ifa_next;
Jamal Hadi Salim0ff60a42005-11-22 14:47:37 -0800268 prev_prom = ifa;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269 continue;
270 }
271
Jamal Hadi Salim0ff60a42005-11-22 14:47:37 -0800272 if (!do_promote) {
Harald Welte8f937c62005-05-29 20:23:46 -0700273 *ifap1 = ifa->ifa_next;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274
Thomas Grafd6062cb2006-08-15 00:33:59 -0700275 rtmsg_ifa(RTM_DELADDR, ifa, nlh, pid);
Alan Sterne041c682006-03-27 01:16:30 -0800276 blocking_notifier_call_chain(&inetaddr_chain,
277 NETDEV_DOWN, ifa);
Harald Welte8f937c62005-05-29 20:23:46 -0700278 inet_free_ifa(ifa);
279 } else {
280 promote = ifa;
281 break;
282 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283 }
284 }
285
286 /* 2. Unlink it */
287
288 *ifap = ifa1->ifa_next;
289
290 /* 3. Announce address deletion */
291
292 /* Send message first, then call notifier.
293 At first sight, FIB update triggered by notifier
294 will refer to already deleted ifaddr, that could confuse
295 netlink listeners. It is not true: look, gated sees
296 that route deleted and if it still thinks that ifaddr
297 is valid, it will try to restore deleted routes... Grr.
298 So that, this order is correct.
299 */
Thomas Grafd6062cb2006-08-15 00:33:59 -0700300 rtmsg_ifa(RTM_DELADDR, ifa1, nlh, pid);
Alan Sterne041c682006-03-27 01:16:30 -0800301 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa1);
Jamal Hadi Salim0ff60a42005-11-22 14:47:37 -0800302
303 if (promote) {
304
305 if (prev_prom) {
306 prev_prom->ifa_next = promote->ifa_next;
307 promote->ifa_next = last_prim->ifa_next;
308 last_prim->ifa_next = promote;
309 }
310
311 promote->ifa_flags &= ~IFA_F_SECONDARY;
Thomas Grafd6062cb2006-08-15 00:33:59 -0700312 rtmsg_ifa(RTM_NEWADDR, promote, nlh, pid);
Alan Sterne041c682006-03-27 01:16:30 -0800313 blocking_notifier_call_chain(&inetaddr_chain,
314 NETDEV_UP, promote);
Jamal Hadi Salim0ff60a42005-11-22 14:47:37 -0800315 for (ifa = promote->ifa_next; ifa; ifa = ifa->ifa_next) {
316 if (ifa1->ifa_mask != ifa->ifa_mask ||
317 !inet_ifa_match(ifa1->ifa_address, ifa))
318 continue;
319 fib_add_ifaddr(ifa);
320 }
321
322 }
Herbert Xu63630972007-06-07 18:35:38 -0700323 if (destroy)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324 inet_free_ifa(ifa1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325}
326
Thomas Grafd6062cb2006-08-15 00:33:59 -0700327static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
328 int destroy)
329{
330 __inet_del_ifa(in_dev, ifap, destroy, NULL, 0);
331}
332
333static int __inet_insert_ifa(struct in_ifaddr *ifa, struct nlmsghdr *nlh,
334 u32 pid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335{
336 struct in_device *in_dev = ifa->ifa_dev;
337 struct in_ifaddr *ifa1, **ifap, **last_primary;
338
339 ASSERT_RTNL();
340
341 if (!ifa->ifa_local) {
342 inet_free_ifa(ifa);
343 return 0;
344 }
345
346 ifa->ifa_flags &= ~IFA_F_SECONDARY;
347 last_primary = &in_dev->ifa_list;
348
349 for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL;
350 ifap = &ifa1->ifa_next) {
351 if (!(ifa1->ifa_flags & IFA_F_SECONDARY) &&
352 ifa->ifa_scope <= ifa1->ifa_scope)
353 last_primary = &ifa1->ifa_next;
354 if (ifa1->ifa_mask == ifa->ifa_mask &&
355 inet_ifa_match(ifa1->ifa_address, ifa)) {
356 if (ifa1->ifa_local == ifa->ifa_local) {
357 inet_free_ifa(ifa);
358 return -EEXIST;
359 }
360 if (ifa1->ifa_scope != ifa->ifa_scope) {
361 inet_free_ifa(ifa);
362 return -EINVAL;
363 }
364 ifa->ifa_flags |= IFA_F_SECONDARY;
365 }
366 }
367
368 if (!(ifa->ifa_flags & IFA_F_SECONDARY)) {
369 net_srandom(ifa->ifa_local);
370 ifap = last_primary;
371 }
372
373 ifa->ifa_next = *ifap;
374 *ifap = ifa;
375
376 /* Send message first, then call notifier.
377 Notifier will trigger FIB update, so that
378 listeners of netlink will know about new ifaddr */
Thomas Grafd6062cb2006-08-15 00:33:59 -0700379 rtmsg_ifa(RTM_NEWADDR, ifa, nlh, pid);
Alan Sterne041c682006-03-27 01:16:30 -0800380 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381
382 return 0;
383}
384
Thomas Grafd6062cb2006-08-15 00:33:59 -0700385static int inet_insert_ifa(struct in_ifaddr *ifa)
386{
387 return __inet_insert_ifa(ifa, NULL, 0);
388}
389
Linus Torvalds1da177e2005-04-16 15:20:36 -0700390static int inet_set_ifa(struct net_device *dev, struct in_ifaddr *ifa)
391{
Herbert Xue5ed6392005-10-03 14:35:55 -0700392 struct in_device *in_dev = __in_dev_get_rtnl(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393
394 ASSERT_RTNL();
395
396 if (!in_dev) {
Herbert Xu71e27da2007-06-04 23:36:06 -0700397 inet_free_ifa(ifa);
398 return -ENOBUFS;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399 }
Herbert Xu71e27da2007-06-04 23:36:06 -0700400 ipv4_devconf_setall(in_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401 if (ifa->ifa_dev != in_dev) {
402 BUG_TRAP(!ifa->ifa_dev);
403 in_dev_hold(in_dev);
404 ifa->ifa_dev = in_dev;
405 }
Joe Perchesf97c1e02007-12-16 13:45:43 -0800406 if (ipv4_is_loopback(ifa->ifa_local))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407 ifa->ifa_scope = RT_SCOPE_HOST;
408 return inet_insert_ifa(ifa);
409}
410
Denis V. Lunev7fee0ca2008-01-21 17:32:38 -0800411struct in_device *inetdev_by_index(struct net *net, int ifindex)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412{
413 struct net_device *dev;
414 struct in_device *in_dev = NULL;
415 read_lock(&dev_base_lock);
Denis V. Lunev7fee0ca2008-01-21 17:32:38 -0800416 dev = __dev_get_by_index(net, ifindex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417 if (dev)
418 in_dev = in_dev_get(dev);
419 read_unlock(&dev_base_lock);
420 return in_dev;
421}
422
423/* Called only from RTNL semaphored context. No locks. */
424
Al Viro60cad5d2006-09-26 22:17:09 -0700425struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix,
426 __be32 mask)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427{
428 ASSERT_RTNL();
429
430 for_primary_ifa(in_dev) {
431 if (ifa->ifa_mask == mask && inet_ifa_match(prefix, ifa))
432 return ifa;
433 } endfor_ifa(in_dev);
434 return NULL;
435}
436
437static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
438{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900439 struct net *net = sock_net(skb->sk);
Thomas Grafdfdd5fd2006-08-04 23:04:17 -0700440 struct nlattr *tb[IFA_MAX+1];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441 struct in_device *in_dev;
Thomas Grafdfdd5fd2006-08-04 23:04:17 -0700442 struct ifaddrmsg *ifm;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443 struct in_ifaddr *ifa, **ifap;
Thomas Grafdfdd5fd2006-08-04 23:04:17 -0700444 int err = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445
446 ASSERT_RTNL();
447
Thomas Grafdfdd5fd2006-08-04 23:04:17 -0700448 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy);
449 if (err < 0)
450 goto errout;
451
452 ifm = nlmsg_data(nlh);
Denis V. Lunev7fee0ca2008-01-21 17:32:38 -0800453 in_dev = inetdev_by_index(net, ifm->ifa_index);
Thomas Grafdfdd5fd2006-08-04 23:04:17 -0700454 if (in_dev == NULL) {
455 err = -ENODEV;
456 goto errout;
457 }
458
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459 __in_dev_put(in_dev);
460
461 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
462 ifap = &ifa->ifa_next) {
Thomas Grafdfdd5fd2006-08-04 23:04:17 -0700463 if (tb[IFA_LOCAL] &&
Al Viroa7a628c2006-09-26 22:16:43 -0700464 ifa->ifa_local != nla_get_be32(tb[IFA_LOCAL]))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465 continue;
Thomas Grafdfdd5fd2006-08-04 23:04:17 -0700466
467 if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label))
468 continue;
469
470 if (tb[IFA_ADDRESS] &&
471 (ifm->ifa_prefixlen != ifa->ifa_prefixlen ||
Al Viroa7a628c2006-09-26 22:16:43 -0700472 !inet_ifa_match(nla_get_be32(tb[IFA_ADDRESS]), ifa)))
Thomas Grafdfdd5fd2006-08-04 23:04:17 -0700473 continue;
474
Thomas Grafd6062cb2006-08-15 00:33:59 -0700475 __inet_del_ifa(in_dev, ifap, 1, nlh, NETLINK_CB(skb).pid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476 return 0;
477 }
Thomas Grafdfdd5fd2006-08-04 23:04:17 -0700478
479 err = -EADDRNOTAVAIL;
480errout:
481 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482}
483
Denis V. Lunev4b8aa9a2008-01-31 18:47:40 -0800484static struct in_ifaddr *rtm_to_ifaddr(struct net *net, struct nlmsghdr *nlh)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485{
Thomas Graf5c753972006-08-04 23:03:53 -0700486 struct nlattr *tb[IFA_MAX+1];
487 struct in_ifaddr *ifa;
488 struct ifaddrmsg *ifm;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489 struct net_device *dev;
490 struct in_device *in_dev;
Denis V. Lunev7b218572008-01-31 18:47:00 -0800491 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700492
Thomas Graf5c753972006-08-04 23:03:53 -0700493 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy);
494 if (err < 0)
495 goto errout;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496
Thomas Graf5c753972006-08-04 23:03:53 -0700497 ifm = nlmsg_data(nlh);
Denis V. Lunev7b218572008-01-31 18:47:00 -0800498 err = -EINVAL;
499 if (ifm->ifa_prefixlen > 32 || tb[IFA_LOCAL] == NULL)
Thomas Graf5c753972006-08-04 23:03:53 -0700500 goto errout;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501
Denis V. Lunev4b8aa9a2008-01-31 18:47:40 -0800502 dev = __dev_get_by_index(net, ifm->ifa_index);
Denis V. Lunev7b218572008-01-31 18:47:00 -0800503 err = -ENODEV;
504 if (dev == NULL)
Thomas Graf5c753972006-08-04 23:03:53 -0700505 goto errout;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506
Thomas Graf5c753972006-08-04 23:03:53 -0700507 in_dev = __in_dev_get_rtnl(dev);
Denis V. Lunev7b218572008-01-31 18:47:00 -0800508 err = -ENOBUFS;
509 if (in_dev == NULL)
Herbert Xu71e27da2007-06-04 23:36:06 -0700510 goto errout;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700511
Thomas Graf5c753972006-08-04 23:03:53 -0700512 ifa = inet_alloc_ifa();
Denis V. Lunev7b218572008-01-31 18:47:00 -0800513 if (ifa == NULL)
Thomas Graf5c753972006-08-04 23:03:53 -0700514 /*
515 * A potential indev allocation can be left alive, it stays
516 * assigned to its device and is destroy with it.
517 */
Thomas Graf5c753972006-08-04 23:03:53 -0700518 goto errout;
Thomas Graf5c753972006-08-04 23:03:53 -0700519
Pavel Emelyanova4e65d32007-12-07 23:55:43 -0800520 ipv4_devconf_setall(in_dev);
Thomas Graf5c753972006-08-04 23:03:53 -0700521 in_dev_hold(in_dev);
522
523 if (tb[IFA_ADDRESS] == NULL)
524 tb[IFA_ADDRESS] = tb[IFA_LOCAL];
525
Linus Torvalds1da177e2005-04-16 15:20:36 -0700526 ifa->ifa_prefixlen = ifm->ifa_prefixlen;
527 ifa->ifa_mask = inet_make_mask(ifm->ifa_prefixlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528 ifa->ifa_flags = ifm->ifa_flags;
529 ifa->ifa_scope = ifm->ifa_scope;
Thomas Graf5c753972006-08-04 23:03:53 -0700530 ifa->ifa_dev = in_dev;
531
Al Viroa7a628c2006-09-26 22:16:43 -0700532 ifa->ifa_local = nla_get_be32(tb[IFA_LOCAL]);
533 ifa->ifa_address = nla_get_be32(tb[IFA_ADDRESS]);
Thomas Graf5c753972006-08-04 23:03:53 -0700534
535 if (tb[IFA_BROADCAST])
Al Viroa7a628c2006-09-26 22:16:43 -0700536 ifa->ifa_broadcast = nla_get_be32(tb[IFA_BROADCAST]);
Thomas Graf5c753972006-08-04 23:03:53 -0700537
Thomas Graf5c753972006-08-04 23:03:53 -0700538 if (tb[IFA_LABEL])
539 nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540 else
541 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
542
Thomas Graf5c753972006-08-04 23:03:53 -0700543 return ifa;
544
545errout:
546 return ERR_PTR(err);
547}
548
549static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
550{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900551 struct net *net = sock_net(skb->sk);
Thomas Graf5c753972006-08-04 23:03:53 -0700552 struct in_ifaddr *ifa;
553
554 ASSERT_RTNL();
555
Denis V. Lunev4b8aa9a2008-01-31 18:47:40 -0800556 ifa = rtm_to_ifaddr(net, nlh);
Thomas Graf5c753972006-08-04 23:03:53 -0700557 if (IS_ERR(ifa))
558 return PTR_ERR(ifa);
559
Thomas Grafd6062cb2006-08-15 00:33:59 -0700560 return __inet_insert_ifa(ifa, nlh, NETLINK_CB(skb).pid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561}
562
563/*
564 * Determine a default network mask, based on the IP address.
565 */
566
Al Viro714e85b2006-11-14 20:51:49 -0800567static __inline__ int inet_abc_len(__be32 addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568{
569 int rc = -1; /* Something else, probably a multicast. */
570
Joe Perchesf97c1e02007-12-16 13:45:43 -0800571 if (ipv4_is_zeronet(addr))
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900572 rc = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573 else {
Al Viro714e85b2006-11-14 20:51:49 -0800574 __u32 haddr = ntohl(addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700575
Al Viro714e85b2006-11-14 20:51:49 -0800576 if (IN_CLASSA(haddr))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700577 rc = 8;
Al Viro714e85b2006-11-14 20:51:49 -0800578 else if (IN_CLASSB(haddr))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700579 rc = 16;
Al Viro714e85b2006-11-14 20:51:49 -0800580 else if (IN_CLASSC(haddr))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700581 rc = 24;
582 }
583
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900584 return rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700585}
586
587
Denis V. Luneve5b13cb2008-02-28 20:51:43 -0800588int devinet_ioctl(struct net *net, unsigned int cmd, void __user *arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700589{
590 struct ifreq ifr;
591 struct sockaddr_in sin_orig;
592 struct sockaddr_in *sin = (struct sockaddr_in *)&ifr.ifr_addr;
593 struct in_device *in_dev;
594 struct in_ifaddr **ifap = NULL;
595 struct in_ifaddr *ifa = NULL;
596 struct net_device *dev;
597 char *colon;
598 int ret = -EFAULT;
599 int tryaddrmatch = 0;
600
601 /*
602 * Fetch the caller's info block into kernel space
603 */
604
605 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
606 goto out;
607 ifr.ifr_name[IFNAMSIZ - 1] = 0;
608
609 /* save original address for comparison */
610 memcpy(&sin_orig, sin, sizeof(*sin));
611
612 colon = strchr(ifr.ifr_name, ':');
613 if (colon)
614 *colon = 0;
615
616#ifdef CONFIG_KMOD
Denis V. Luneve5b13cb2008-02-28 20:51:43 -0800617 dev_load(net, ifr.ifr_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618#endif
619
Stephen Hemminger132adf52007-03-08 20:44:43 -0800620 switch (cmd) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700621 case SIOCGIFADDR: /* Get interface address */
622 case SIOCGIFBRDADDR: /* Get the broadcast address */
623 case SIOCGIFDSTADDR: /* Get the destination address */
624 case SIOCGIFNETMASK: /* Get the netmask for the interface */
625 /* Note that these ioctls will not sleep,
626 so that we do not impose a lock.
627 One day we will be forced to put shlock here (I mean SMP)
628 */
629 tryaddrmatch = (sin_orig.sin_family == AF_INET);
630 memset(sin, 0, sizeof(*sin));
631 sin->sin_family = AF_INET;
632 break;
633
634 case SIOCSIFFLAGS:
635 ret = -EACCES;
636 if (!capable(CAP_NET_ADMIN))
637 goto out;
638 break;
639 case SIOCSIFADDR: /* Set interface address (and family) */
640 case SIOCSIFBRDADDR: /* Set the broadcast address */
641 case SIOCSIFDSTADDR: /* Set the destination address */
642 case SIOCSIFNETMASK: /* Set the netmask for the interface */
643 ret = -EACCES;
644 if (!capable(CAP_NET_ADMIN))
645 goto out;
646 ret = -EINVAL;
647 if (sin->sin_family != AF_INET)
648 goto out;
649 break;
650 default:
651 ret = -EINVAL;
652 goto out;
653 }
654
655 rtnl_lock();
656
657 ret = -ENODEV;
Denis V. Luneve5b13cb2008-02-28 20:51:43 -0800658 if ((dev = __dev_get_by_name(net, ifr.ifr_name)) == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700659 goto done;
660
661 if (colon)
662 *colon = ':';
663
Herbert Xue5ed6392005-10-03 14:35:55 -0700664 if ((in_dev = __in_dev_get_rtnl(dev)) != NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700665 if (tryaddrmatch) {
666 /* Matthias Andree */
667 /* compare label and address (4.4BSD style) */
668 /* note: we only do this for a limited set of ioctls
669 and only if the original address family was AF_INET.
670 This is checked above. */
671 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
672 ifap = &ifa->ifa_next) {
673 if (!strcmp(ifr.ifr_name, ifa->ifa_label) &&
674 sin_orig.sin_addr.s_addr ==
675 ifa->ifa_address) {
676 break; /* found */
677 }
678 }
679 }
680 /* we didn't get a match, maybe the application is
681 4.3BSD-style and passed in junk so we fall back to
682 comparing just the label */
683 if (!ifa) {
684 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
685 ifap = &ifa->ifa_next)
686 if (!strcmp(ifr.ifr_name, ifa->ifa_label))
687 break;
688 }
689 }
690
691 ret = -EADDRNOTAVAIL;
692 if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS)
693 goto done;
694
Stephen Hemminger132adf52007-03-08 20:44:43 -0800695 switch (cmd) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700696 case SIOCGIFADDR: /* Get interface address */
697 sin->sin_addr.s_addr = ifa->ifa_local;
698 goto rarok;
699
700 case SIOCGIFBRDADDR: /* Get the broadcast address */
701 sin->sin_addr.s_addr = ifa->ifa_broadcast;
702 goto rarok;
703
704 case SIOCGIFDSTADDR: /* Get the destination address */
705 sin->sin_addr.s_addr = ifa->ifa_address;
706 goto rarok;
707
708 case SIOCGIFNETMASK: /* Get the netmask for the interface */
709 sin->sin_addr.s_addr = ifa->ifa_mask;
710 goto rarok;
711
712 case SIOCSIFFLAGS:
713 if (colon) {
714 ret = -EADDRNOTAVAIL;
715 if (!ifa)
716 break;
717 ret = 0;
718 if (!(ifr.ifr_flags & IFF_UP))
719 inet_del_ifa(in_dev, ifap, 1);
720 break;
721 }
722 ret = dev_change_flags(dev, ifr.ifr_flags);
723 break;
724
725 case SIOCSIFADDR: /* Set interface address (and family) */
726 ret = -EINVAL;
727 if (inet_abc_len(sin->sin_addr.s_addr) < 0)
728 break;
729
730 if (!ifa) {
731 ret = -ENOBUFS;
732 if ((ifa = inet_alloc_ifa()) == NULL)
733 break;
734 if (colon)
735 memcpy(ifa->ifa_label, ifr.ifr_name, IFNAMSIZ);
736 else
737 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
738 } else {
739 ret = 0;
740 if (ifa->ifa_local == sin->sin_addr.s_addr)
741 break;
742 inet_del_ifa(in_dev, ifap, 0);
743 ifa->ifa_broadcast = 0;
Bjorn Mork148f9722008-02-26 18:17:53 -0800744 ifa->ifa_scope = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700745 }
746
747 ifa->ifa_address = ifa->ifa_local = sin->sin_addr.s_addr;
748
749 if (!(dev->flags & IFF_POINTOPOINT)) {
750 ifa->ifa_prefixlen = inet_abc_len(ifa->ifa_address);
751 ifa->ifa_mask = inet_make_mask(ifa->ifa_prefixlen);
752 if ((dev->flags & IFF_BROADCAST) &&
753 ifa->ifa_prefixlen < 31)
754 ifa->ifa_broadcast = ifa->ifa_address |
755 ~ifa->ifa_mask;
756 } else {
757 ifa->ifa_prefixlen = 32;
758 ifa->ifa_mask = inet_make_mask(32);
759 }
760 ret = inet_set_ifa(dev, ifa);
761 break;
762
763 case SIOCSIFBRDADDR: /* Set the broadcast address */
764 ret = 0;
765 if (ifa->ifa_broadcast != sin->sin_addr.s_addr) {
766 inet_del_ifa(in_dev, ifap, 0);
767 ifa->ifa_broadcast = sin->sin_addr.s_addr;
768 inet_insert_ifa(ifa);
769 }
770 break;
771
772 case SIOCSIFDSTADDR: /* Set the destination address */
773 ret = 0;
774 if (ifa->ifa_address == sin->sin_addr.s_addr)
775 break;
776 ret = -EINVAL;
777 if (inet_abc_len(sin->sin_addr.s_addr) < 0)
778 break;
779 ret = 0;
780 inet_del_ifa(in_dev, ifap, 0);
781 ifa->ifa_address = sin->sin_addr.s_addr;
782 inet_insert_ifa(ifa);
783 break;
784
785 case SIOCSIFNETMASK: /* Set the netmask for the interface */
786
787 /*
788 * The mask we set must be legal.
789 */
790 ret = -EINVAL;
791 if (bad_mask(sin->sin_addr.s_addr, 0))
792 break;
793 ret = 0;
794 if (ifa->ifa_mask != sin->sin_addr.s_addr) {
Al Viroa144ea42006-09-28 18:00:55 -0700795 __be32 old_mask = ifa->ifa_mask;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700796 inet_del_ifa(in_dev, ifap, 0);
797 ifa->ifa_mask = sin->sin_addr.s_addr;
798 ifa->ifa_prefixlen = inet_mask_len(ifa->ifa_mask);
799
800 /* See if current broadcast address matches
801 * with current netmask, then recalculate
802 * the broadcast address. Otherwise it's a
803 * funny address, so don't touch it since
804 * the user seems to know what (s)he's doing...
805 */
806 if ((dev->flags & IFF_BROADCAST) &&
807 (ifa->ifa_prefixlen < 31) &&
808 (ifa->ifa_broadcast ==
David Engeldcab5e12005-10-21 22:09:16 -0500809 (ifa->ifa_local|~old_mask))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700810 ifa->ifa_broadcast = (ifa->ifa_local |
811 ~sin->sin_addr.s_addr);
812 }
813 inet_insert_ifa(ifa);
814 }
815 break;
816 }
817done:
818 rtnl_unlock();
819out:
820 return ret;
821rarok:
822 rtnl_unlock();
823 ret = copy_to_user(arg, &ifr, sizeof(struct ifreq)) ? -EFAULT : 0;
824 goto out;
825}
826
827static int inet_gifconf(struct net_device *dev, char __user *buf, int len)
828{
Herbert Xue5ed6392005-10-03 14:35:55 -0700829 struct in_device *in_dev = __in_dev_get_rtnl(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700830 struct in_ifaddr *ifa;
831 struct ifreq ifr;
832 int done = 0;
833
834 if (!in_dev || (ifa = in_dev->ifa_list) == NULL)
835 goto out;
836
837 for (; ifa; ifa = ifa->ifa_next) {
838 if (!buf) {
839 done += sizeof(ifr);
840 continue;
841 }
842 if (len < (int) sizeof(ifr))
843 break;
844 memset(&ifr, 0, sizeof(struct ifreq));
845 if (ifa->ifa_label)
846 strcpy(ifr.ifr_name, ifa->ifa_label);
847 else
848 strcpy(ifr.ifr_name, dev->name);
849
850 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_family = AF_INET;
851 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_addr.s_addr =
852 ifa->ifa_local;
853
854 if (copy_to_user(buf, &ifr, sizeof(struct ifreq))) {
855 done = -EFAULT;
856 break;
857 }
858 buf += sizeof(struct ifreq);
859 len -= sizeof(struct ifreq);
860 done += sizeof(struct ifreq);
861 }
862out:
863 return done;
864}
865
Al Viroa61ced52006-09-26 21:27:54 -0700866__be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700867{
Al Viroa61ced52006-09-26 21:27:54 -0700868 __be32 addr = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700869 struct in_device *in_dev;
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +0900870 struct net *net = dev_net(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700871
872 rcu_read_lock();
Herbert Xue5ed6392005-10-03 14:35:55 -0700873 in_dev = __in_dev_get_rcu(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700874 if (!in_dev)
875 goto no_in_dev;
876
877 for_primary_ifa(in_dev) {
878 if (ifa->ifa_scope > scope)
879 continue;
880 if (!dst || inet_ifa_match(dst, ifa)) {
881 addr = ifa->ifa_local;
882 break;
883 }
884 if (!addr)
885 addr = ifa->ifa_local;
886 } endfor_ifa(in_dev);
887no_in_dev:
888 rcu_read_unlock();
889
890 if (addr)
891 goto out;
892
893 /* Not loopback addresses on loopback should be preferred
894 in this case. It is importnat that lo is the first interface
895 in dev_base list.
896 */
897 read_lock(&dev_base_lock);
898 rcu_read_lock();
Denis V. Lunevc4544c72008-02-28 20:52:54 -0800899 for_each_netdev(net, dev) {
Herbert Xue5ed6392005-10-03 14:35:55 -0700900 if ((in_dev = __in_dev_get_rcu(dev)) == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700901 continue;
902
903 for_primary_ifa(in_dev) {
904 if (ifa->ifa_scope != RT_SCOPE_LINK &&
905 ifa->ifa_scope <= scope) {
906 addr = ifa->ifa_local;
907 goto out_unlock_both;
908 }
909 } endfor_ifa(in_dev);
910 }
911out_unlock_both:
912 read_unlock(&dev_base_lock);
913 rcu_read_unlock();
914out:
915 return addr;
916}
917
Al Viro60cad5d2006-09-26 22:17:09 -0700918static __be32 confirm_addr_indev(struct in_device *in_dev, __be32 dst,
919 __be32 local, int scope)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700920{
921 int same = 0;
Al Viroa144ea42006-09-28 18:00:55 -0700922 __be32 addr = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700923
924 for_ifa(in_dev) {
925 if (!addr &&
926 (local == ifa->ifa_local || !local) &&
927 ifa->ifa_scope <= scope) {
928 addr = ifa->ifa_local;
929 if (same)
930 break;
931 }
932 if (!same) {
933 same = (!local || inet_ifa_match(local, ifa)) &&
934 (!dst || inet_ifa_match(dst, ifa));
935 if (same && addr) {
936 if (local || !dst)
937 break;
938 /* Is the selected addr into dst subnet? */
939 if (inet_ifa_match(addr, ifa))
940 break;
941 /* No, then can we use new local src? */
942 if (ifa->ifa_scope <= scope) {
943 addr = ifa->ifa_local;
944 break;
945 }
946 /* search for large dst subnet for addr */
947 same = 0;
948 }
949 }
950 } endfor_ifa(in_dev);
951
952 return same? addr : 0;
953}
954
955/*
956 * Confirm that local IP address exists using wildcards:
Denis V. Lunev9bd85e32008-01-14 23:05:55 -0800957 * - in_dev: only on this interface, 0=any interface
Linus Torvalds1da177e2005-04-16 15:20:36 -0700958 * - dst: only in the same subnet as dst, 0=any dst
959 * - local: address, 0=autoselect the local address
960 * - scope: maximum allowed scope value for the local address
961 */
Denis V. Lunev9bd85e32008-01-14 23:05:55 -0800962__be32 inet_confirm_addr(struct in_device *in_dev,
963 __be32 dst, __be32 local, int scope)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700964{
Al Viro60cad5d2006-09-26 22:17:09 -0700965 __be32 addr = 0;
Denis V. Lunev9bd85e32008-01-14 23:05:55 -0800966 struct net_device *dev;
Denis V. Lunev39a6d062008-01-14 23:06:19 -0800967 struct net *net;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700968
Denis V. Lunev39a6d062008-01-14 23:06:19 -0800969 if (scope != RT_SCOPE_LINK)
Denis V. Lunev9bd85e32008-01-14 23:05:55 -0800970 return confirm_addr_indev(in_dev, dst, local, scope);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700971
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +0900972 net = dev_net(in_dev->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700973 read_lock(&dev_base_lock);
974 rcu_read_lock();
Denis V. Lunev39a6d062008-01-14 23:06:19 -0800975 for_each_netdev(net, dev) {
Herbert Xue5ed6392005-10-03 14:35:55 -0700976 if ((in_dev = __in_dev_get_rcu(dev))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700977 addr = confirm_addr_indev(in_dev, dst, local, scope);
978 if (addr)
979 break;
980 }
981 }
982 rcu_read_unlock();
983 read_unlock(&dev_base_lock);
984
985 return addr;
986}
987
988/*
989 * Device notifier
990 */
991
992int register_inetaddr_notifier(struct notifier_block *nb)
993{
Alan Sterne041c682006-03-27 01:16:30 -0800994 return blocking_notifier_chain_register(&inetaddr_chain, nb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700995}
996
997int unregister_inetaddr_notifier(struct notifier_block *nb)
998{
Alan Sterne041c682006-03-27 01:16:30 -0800999 return blocking_notifier_chain_unregister(&inetaddr_chain, nb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001000}
1001
1002/* Rename ifa_labels for a device name change. Make some effort to preserve existing
1003 * alias numbering and to create unique labels if possible.
1004*/
1005static void inetdev_changename(struct net_device *dev, struct in_device *in_dev)
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001006{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001007 struct in_ifaddr *ifa;
1008 int named = 0;
1009
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001010 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1011 char old[IFNAMSIZ], *dot;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001012
1013 memcpy(old, ifa->ifa_label, IFNAMSIZ);
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001014 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001015 if (named++ == 0)
Thomas Graf573bf472008-06-10 15:40:04 -07001016 goto skip;
Mark McLoughlin44344b22008-01-04 00:56:25 -08001017 dot = strchr(old, ':');
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001018 if (dot == NULL) {
1019 sprintf(old, ":%d", named);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001020 dot = old;
1021 }
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001022 if (strlen(dot) + strlen(dev->name) < IFNAMSIZ) {
1023 strcat(ifa->ifa_label, dot);
1024 } else {
1025 strcpy(ifa->ifa_label + (IFNAMSIZ - strlen(dot) - 1), dot);
1026 }
Thomas Graf573bf472008-06-10 15:40:04 -07001027skip:
1028 rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0);
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001029 }
1030}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001031
1032/* Called only under RTNL semaphore */
1033
1034static int inetdev_event(struct notifier_block *this, unsigned long event,
1035 void *ptr)
1036{
1037 struct net_device *dev = ptr;
Herbert Xue5ed6392005-10-03 14:35:55 -07001038 struct in_device *in_dev = __in_dev_get_rtnl(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001039
1040 ASSERT_RTNL();
1041
1042 if (!in_dev) {
Herbert Xu8030f542007-02-22 01:53:47 +09001043 if (event == NETDEV_REGISTER) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001044 in_dev = inetdev_init(dev);
Herbert Xub217d612007-07-30 17:04:52 -07001045 if (!in_dev)
1046 return notifier_from_errno(-ENOMEM);
Eric W. Biederman0cc217e2007-09-26 22:10:06 -07001047 if (dev->flags & IFF_LOOPBACK) {
Herbert Xu42f811b2007-06-04 23:34:44 -07001048 IN_DEV_CONF_SET(in_dev, NOXFRM, 1);
1049 IN_DEV_CONF_SET(in_dev, NOPOLICY, 1);
Herbert Xu8030f542007-02-22 01:53:47 +09001050 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001051 }
1052 goto out;
1053 }
1054
1055 switch (event) {
1056 case NETDEV_REGISTER:
1057 printk(KERN_DEBUG "inetdev_event: bug\n");
1058 dev->ip_ptr = NULL;
1059 break;
1060 case NETDEV_UP:
1061 if (dev->mtu < 68)
1062 break;
Eric W. Biederman0cc217e2007-09-26 22:10:06 -07001063 if (dev->flags & IFF_LOOPBACK) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001064 struct in_ifaddr *ifa;
1065 if ((ifa = inet_alloc_ifa()) != NULL) {
1066 ifa->ifa_local =
1067 ifa->ifa_address = htonl(INADDR_LOOPBACK);
1068 ifa->ifa_prefixlen = 8;
1069 ifa->ifa_mask = inet_make_mask(8);
1070 in_dev_hold(in_dev);
1071 ifa->ifa_dev = in_dev;
1072 ifa->ifa_scope = RT_SCOPE_HOST;
1073 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1074 inet_insert_ifa(ifa);
1075 }
1076 }
1077 ip_mc_up(in_dev);
1078 break;
1079 case NETDEV_DOWN:
1080 ip_mc_down(in_dev);
1081 break;
1082 case NETDEV_CHANGEMTU:
1083 if (dev->mtu >= 68)
1084 break;
1085 /* MTU falled under 68, disable IP */
1086 case NETDEV_UNREGISTER:
1087 inetdev_destroy(in_dev);
1088 break;
1089 case NETDEV_CHANGENAME:
1090 /* Do not notify about label change, this event is
1091 * not interesting to applications using netlink.
1092 */
1093 inetdev_changename(dev, in_dev);
1094
Pavel Emelyanov51602b22007-12-11 02:17:40 -08001095 devinet_sysctl_unregister(in_dev);
Pavel Emelyanov66f27a52007-12-02 00:55:54 +11001096 devinet_sysctl_register(in_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001097 break;
1098 }
1099out:
1100 return NOTIFY_DONE;
1101}
1102
1103static struct notifier_block ip_netdev_notifier = {
1104 .notifier_call =inetdev_event,
1105};
1106
Thomas Graf339bf982006-11-10 14:10:15 -08001107static inline size_t inet_nlmsg_size(void)
1108{
1109 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
1110 + nla_total_size(4) /* IFA_ADDRESS */
1111 + nla_total_size(4) /* IFA_LOCAL */
1112 + nla_total_size(4) /* IFA_BROADCAST */
Thomas Graf339bf982006-11-10 14:10:15 -08001113 + nla_total_size(IFNAMSIZ); /* IFA_LABEL */
1114}
1115
Linus Torvalds1da177e2005-04-16 15:20:36 -07001116static int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa,
Jamal Hadi Salimb6544c02005-06-18 22:54:12 -07001117 u32 pid, u32 seq, int event, unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001118{
1119 struct ifaddrmsg *ifm;
1120 struct nlmsghdr *nlh;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001121
Thomas Graf47f68512006-08-04 23:04:36 -07001122 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*ifm), flags);
1123 if (nlh == NULL)
Patrick McHardy26932562007-01-31 23:16:40 -08001124 return -EMSGSIZE;
Thomas Graf47f68512006-08-04 23:04:36 -07001125
1126 ifm = nlmsg_data(nlh);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001127 ifm->ifa_family = AF_INET;
1128 ifm->ifa_prefixlen = ifa->ifa_prefixlen;
1129 ifm->ifa_flags = ifa->ifa_flags|IFA_F_PERMANENT;
1130 ifm->ifa_scope = ifa->ifa_scope;
1131 ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001132
Thomas Graf47f68512006-08-04 23:04:36 -07001133 if (ifa->ifa_address)
Al Viroa7a628c2006-09-26 22:16:43 -07001134 NLA_PUT_BE32(skb, IFA_ADDRESS, ifa->ifa_address);
Thomas Graf47f68512006-08-04 23:04:36 -07001135
1136 if (ifa->ifa_local)
Al Viroa7a628c2006-09-26 22:16:43 -07001137 NLA_PUT_BE32(skb, IFA_LOCAL, ifa->ifa_local);
Thomas Graf47f68512006-08-04 23:04:36 -07001138
1139 if (ifa->ifa_broadcast)
Al Viroa7a628c2006-09-26 22:16:43 -07001140 NLA_PUT_BE32(skb, IFA_BROADCAST, ifa->ifa_broadcast);
Thomas Graf47f68512006-08-04 23:04:36 -07001141
Thomas Graf47f68512006-08-04 23:04:36 -07001142 if (ifa->ifa_label[0])
1143 NLA_PUT_STRING(skb, IFA_LABEL, ifa->ifa_label);
1144
1145 return nlmsg_end(skb, nlh);
1146
1147nla_put_failure:
Patrick McHardy26932562007-01-31 23:16:40 -08001148 nlmsg_cancel(skb, nlh);
1149 return -EMSGSIZE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001150}
1151
1152static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
1153{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +09001154 struct net *net = sock_net(skb->sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001155 int idx, ip_idx;
1156 struct net_device *dev;
1157 struct in_device *in_dev;
1158 struct in_ifaddr *ifa;
1159 int s_ip_idx, s_idx = cb->args[0];
1160
1161 s_ip_idx = ip_idx = cb->args[1];
Pavel Emelianov7562f872007-05-03 15:13:45 -07001162 idx = 0;
Denis V. Lunev4b8aa9a2008-01-31 18:47:40 -08001163 for_each_netdev(net, dev) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001164 if (idx < s_idx)
Pavel Emelianov7562f872007-05-03 15:13:45 -07001165 goto cont;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001166 if (idx > s_idx)
1167 s_ip_idx = 0;
Patrick McHardy6313c1e2007-04-16 17:00:53 -07001168 if ((in_dev = __in_dev_get_rtnl(dev)) == NULL)
Pavel Emelianov7562f872007-05-03 15:13:45 -07001169 goto cont;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001170
1171 for (ifa = in_dev->ifa_list, ip_idx = 0; ifa;
1172 ifa = ifa->ifa_next, ip_idx++) {
1173 if (ip_idx < s_ip_idx)
Stephen Hemminger596e4152007-09-11 10:41:04 +02001174 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001175 if (inet_fill_ifaddr(skb, ifa, NETLINK_CB(cb->skb).pid,
1176 cb->nlh->nlmsg_seq,
Patrick McHardy6313c1e2007-04-16 17:00:53 -07001177 RTM_NEWADDR, NLM_F_MULTI) <= 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001178 goto done;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001179 }
Pavel Emelianov7562f872007-05-03 15:13:45 -07001180cont:
1181 idx++;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001182 }
1183
1184done:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001185 cb->args[0] = idx;
1186 cb->args[1] = ip_idx;
1187
1188 return skb->len;
1189}
1190
Thomas Grafd6062cb2006-08-15 00:33:59 -07001191static void rtmsg_ifa(int event, struct in_ifaddr* ifa, struct nlmsghdr *nlh,
1192 u32 pid)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001193{
Thomas Graf47f68512006-08-04 23:04:36 -07001194 struct sk_buff *skb;
Thomas Grafd6062cb2006-08-15 00:33:59 -07001195 u32 seq = nlh ? nlh->nlmsg_seq : 0;
1196 int err = -ENOBUFS;
Denis V. Lunev4b8aa9a2008-01-31 18:47:40 -08001197 struct net *net;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001198
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +09001199 net = dev_net(ifa->ifa_dev->dev);
Thomas Graf339bf982006-11-10 14:10:15 -08001200 skb = nlmsg_new(inet_nlmsg_size(), GFP_KERNEL);
Thomas Graf47f68512006-08-04 23:04:36 -07001201 if (skb == NULL)
Thomas Grafd6062cb2006-08-15 00:33:59 -07001202 goto errout;
1203
1204 err = inet_fill_ifaddr(skb, ifa, pid, seq, event, 0);
Patrick McHardy26932562007-01-31 23:16:40 -08001205 if (err < 0) {
1206 /* -EMSGSIZE implies BUG in inet_nlmsg_size() */
1207 WARN_ON(err == -EMSGSIZE);
1208 kfree_skb(skb);
1209 goto errout;
1210 }
Denis V. Lunev4b8aa9a2008-01-31 18:47:40 -08001211 err = rtnl_notify(skb, net, pid, RTNLGRP_IPV4_IFADDR, nlh, GFP_KERNEL);
Thomas Grafd6062cb2006-08-15 00:33:59 -07001212errout:
1213 if (err < 0)
Denis V. Lunev4b8aa9a2008-01-31 18:47:40 -08001214 rtnl_set_sk_err(net, RTNLGRP_IPV4_IFADDR, err);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001215}
1216
Linus Torvalds1da177e2005-04-16 15:20:36 -07001217#ifdef CONFIG_SYSCTL
1218
Pavel Emelyanovc0ce9fb2007-12-16 13:31:14 -08001219static void devinet_copy_dflt_conf(struct net *net, int i)
Herbert Xu31be3082007-06-04 23:35:37 -07001220{
1221 struct net_device *dev;
1222
1223 read_lock(&dev_base_lock);
Pavel Emelyanovc0ce9fb2007-12-16 13:31:14 -08001224 for_each_netdev(net, dev) {
Herbert Xu31be3082007-06-04 23:35:37 -07001225 struct in_device *in_dev;
1226 rcu_read_lock();
1227 in_dev = __in_dev_get_rcu(dev);
1228 if (in_dev && !test_bit(i, in_dev->cnf.state))
Pavel Emelyanov9355bbd2007-12-16 13:32:16 -08001229 in_dev->cnf.data[i] = net->ipv4.devconf_dflt->data[i];
Herbert Xu31be3082007-06-04 23:35:37 -07001230 rcu_read_unlock();
1231 }
1232 read_unlock(&dev_base_lock);
1233}
1234
Pavel Emelyanovc0ce9fb2007-12-16 13:31:14 -08001235static void inet_forward_change(struct net *net)
Pavel Emelyanov68dd2992007-12-05 01:44:58 -08001236{
1237 struct net_device *dev;
Pavel Emelyanov586f1212007-12-16 13:32:48 -08001238 int on = IPV4_DEVCONF_ALL(net, FORWARDING);
Pavel Emelyanov68dd2992007-12-05 01:44:58 -08001239
Pavel Emelyanov586f1212007-12-16 13:32:48 -08001240 IPV4_DEVCONF_ALL(net, ACCEPT_REDIRECTS) = !on;
Pavel Emelyanov9355bbd2007-12-16 13:32:16 -08001241 IPV4_DEVCONF_DFLT(net, FORWARDING) = on;
Pavel Emelyanov68dd2992007-12-05 01:44:58 -08001242
1243 read_lock(&dev_base_lock);
Pavel Emelyanovc0ce9fb2007-12-16 13:31:14 -08001244 for_each_netdev(net, dev) {
Pavel Emelyanov68dd2992007-12-05 01:44:58 -08001245 struct in_device *in_dev;
Ben Hutchings0187bdf2008-06-19 16:15:47 -07001246 if (on)
1247 dev_disable_lro(dev);
Pavel Emelyanov68dd2992007-12-05 01:44:58 -08001248 rcu_read_lock();
1249 in_dev = __in_dev_get_rcu(dev);
1250 if (in_dev)
1251 IN_DEV_CONF_SET(in_dev, FORWARDING, on);
1252 rcu_read_unlock();
1253 }
1254 read_unlock(&dev_base_lock);
Pavel Emelyanov68dd2992007-12-05 01:44:58 -08001255}
1256
Herbert Xu31be3082007-06-04 23:35:37 -07001257static int devinet_conf_proc(ctl_table *ctl, int write,
1258 struct file* filp, void __user *buffer,
1259 size_t *lenp, loff_t *ppos)
1260{
1261 int ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
1262
1263 if (write) {
1264 struct ipv4_devconf *cnf = ctl->extra1;
Pavel Emelyanovc0ce9fb2007-12-16 13:31:14 -08001265 struct net *net = ctl->extra2;
Herbert Xu31be3082007-06-04 23:35:37 -07001266 int i = (int *)ctl->data - cnf->data;
1267
1268 set_bit(i, cnf->state);
1269
Pavel Emelyanov9355bbd2007-12-16 13:32:16 -08001270 if (cnf == net->ipv4.devconf_dflt)
Pavel Emelyanovc0ce9fb2007-12-16 13:31:14 -08001271 devinet_copy_dflt_conf(net, i);
Herbert Xu31be3082007-06-04 23:35:37 -07001272 }
1273
1274 return ret;
1275}
1276
1277static int devinet_conf_sysctl(ctl_table *table, int __user *name, int nlen,
1278 void __user *oldval, size_t __user *oldlenp,
1279 void __user *newval, size_t newlen)
1280{
1281 struct ipv4_devconf *cnf;
Pavel Emelyanovc0ce9fb2007-12-16 13:31:14 -08001282 struct net *net;
Herbert Xu31be3082007-06-04 23:35:37 -07001283 int *valp = table->data;
1284 int new;
1285 int i;
1286
1287 if (!newval || !newlen)
1288 return 0;
1289
1290 if (newlen != sizeof(int))
1291 return -EINVAL;
1292
1293 if (get_user(new, (int __user *)newval))
1294 return -EFAULT;
1295
1296 if (new == *valp)
1297 return 0;
1298
1299 if (oldval && oldlenp) {
1300 size_t len;
1301
1302 if (get_user(len, oldlenp))
1303 return -EFAULT;
1304
1305 if (len) {
1306 if (len > table->maxlen)
1307 len = table->maxlen;
1308 if (copy_to_user(oldval, valp, len))
1309 return -EFAULT;
1310 if (put_user(len, oldlenp))
1311 return -EFAULT;
1312 }
1313 }
1314
1315 *valp = new;
1316
1317 cnf = table->extra1;
Pavel Emelyanovc0ce9fb2007-12-16 13:31:14 -08001318 net = table->extra2;
Herbert Xu31be3082007-06-04 23:35:37 -07001319 i = (int *)table->data - cnf->data;
1320
1321 set_bit(i, cnf->state);
1322
Pavel Emelyanov9355bbd2007-12-16 13:32:16 -08001323 if (cnf == net->ipv4.devconf_dflt)
Pavel Emelyanovc0ce9fb2007-12-16 13:31:14 -08001324 devinet_copy_dflt_conf(net, i);
Herbert Xu31be3082007-06-04 23:35:37 -07001325
1326 return 1;
1327}
1328
Linus Torvalds1da177e2005-04-16 15:20:36 -07001329static int devinet_sysctl_forward(ctl_table *ctl, int write,
1330 struct file* filp, void __user *buffer,
1331 size_t *lenp, loff_t *ppos)
1332{
1333 int *valp = ctl->data;
1334 int val = *valp;
1335 int ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
1336
1337 if (write && *valp != val) {
Pavel Emelyanovc0ce9fb2007-12-16 13:31:14 -08001338 struct net *net = ctl->extra2;
1339
Ben Hutchings0187bdf2008-06-19 16:15:47 -07001340 if (valp != &IPV4_DEVCONF_DFLT(net, FORWARDING)) {
1341 rtnl_lock();
1342 if (valp == &IPV4_DEVCONF_ALL(net, FORWARDING)) {
1343 inet_forward_change(net);
1344 } else if (*valp) {
1345 struct ipv4_devconf *cnf = ctl->extra1;
1346 struct in_device *idev =
1347 container_of(cnf, struct in_device, cnf);
1348 dev_disable_lro(idev->dev);
1349 }
1350 rtnl_unlock();
Denis V. Lunev76e6ebf2008-07-05 19:00:44 -07001351 rt_cache_flush(net, 0);
Ben Hutchings0187bdf2008-06-19 16:15:47 -07001352 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001353 }
1354
1355 return ret;
1356}
1357
1358int ipv4_doint_and_flush(ctl_table *ctl, int write,
1359 struct file* filp, void __user *buffer,
1360 size_t *lenp, loff_t *ppos)
1361{
1362 int *valp = ctl->data;
1363 int val = *valp;
1364 int ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
Denis V. Lunev76e6ebf2008-07-05 19:00:44 -07001365 struct net *net = ctl->extra2;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001366
1367 if (write && *valp != val)
Denis V. Lunev76e6ebf2008-07-05 19:00:44 -07001368 rt_cache_flush(net, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001369
1370 return ret;
1371}
1372
1373int ipv4_doint_and_flush_strategy(ctl_table *table, int __user *name, int nlen,
1374 void __user *oldval, size_t __user *oldlenp,
Alexey Dobriyan1f29bcd2006-12-10 02:19:10 -08001375 void __user *newval, size_t newlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001376{
Herbert Xu31be3082007-06-04 23:35:37 -07001377 int ret = devinet_conf_sysctl(table, name, nlen, oldval, oldlenp,
1378 newval, newlen);
Denis V. Lunev76e6ebf2008-07-05 19:00:44 -07001379 struct net *net = table->extra2;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001380
Herbert Xu31be3082007-06-04 23:35:37 -07001381 if (ret == 1)
Denis V. Lunev76e6ebf2008-07-05 19:00:44 -07001382 rt_cache_flush(net, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001383
Herbert Xu31be3082007-06-04 23:35:37 -07001384 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001385}
1386
1387
Herbert Xu42f811b2007-06-04 23:34:44 -07001388#define DEVINET_SYSCTL_ENTRY(attr, name, mval, proc, sysctl) \
1389 { \
1390 .ctl_name = NET_IPV4_CONF_ ## attr, \
1391 .procname = name, \
1392 .data = ipv4_devconf.data + \
1393 NET_IPV4_CONF_ ## attr - 1, \
1394 .maxlen = sizeof(int), \
1395 .mode = mval, \
1396 .proc_handler = proc, \
1397 .strategy = sysctl, \
Herbert Xu31be3082007-06-04 23:35:37 -07001398 .extra1 = &ipv4_devconf, \
Herbert Xu42f811b2007-06-04 23:34:44 -07001399 }
1400
1401#define DEVINET_SYSCTL_RW_ENTRY(attr, name) \
Herbert Xu31be3082007-06-04 23:35:37 -07001402 DEVINET_SYSCTL_ENTRY(attr, name, 0644, devinet_conf_proc, \
1403 devinet_conf_sysctl)
Herbert Xu42f811b2007-06-04 23:34:44 -07001404
1405#define DEVINET_SYSCTL_RO_ENTRY(attr, name) \
Herbert Xu31be3082007-06-04 23:35:37 -07001406 DEVINET_SYSCTL_ENTRY(attr, name, 0444, devinet_conf_proc, \
1407 devinet_conf_sysctl)
Herbert Xu42f811b2007-06-04 23:34:44 -07001408
1409#define DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, proc, sysctl) \
1410 DEVINET_SYSCTL_ENTRY(attr, name, 0644, proc, sysctl)
1411
1412#define DEVINET_SYSCTL_FLUSHING_ENTRY(attr, name) \
1413 DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, ipv4_doint_and_flush, \
1414 ipv4_doint_and_flush_strategy)
1415
Linus Torvalds1da177e2005-04-16 15:20:36 -07001416static struct devinet_sysctl_table {
1417 struct ctl_table_header *sysctl_header;
Pavel Emelyanovbfada692007-12-02 00:57:08 +11001418 struct ctl_table devinet_vars[__NET_IPV4_CONF_MAX];
1419 char *dev_name;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001420} devinet_sysctl = {
1421 .devinet_vars = {
Herbert Xu42f811b2007-06-04 23:34:44 -07001422 DEVINET_SYSCTL_COMPLEX_ENTRY(FORWARDING, "forwarding",
Herbert Xu31be3082007-06-04 23:35:37 -07001423 devinet_sysctl_forward,
1424 devinet_conf_sysctl),
Herbert Xu42f811b2007-06-04 23:34:44 -07001425 DEVINET_SYSCTL_RO_ENTRY(MC_FORWARDING, "mc_forwarding"),
1426
1427 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_REDIRECTS, "accept_redirects"),
1428 DEVINET_SYSCTL_RW_ENTRY(SECURE_REDIRECTS, "secure_redirects"),
1429 DEVINET_SYSCTL_RW_ENTRY(SHARED_MEDIA, "shared_media"),
1430 DEVINET_SYSCTL_RW_ENTRY(RP_FILTER, "rp_filter"),
1431 DEVINET_SYSCTL_RW_ENTRY(SEND_REDIRECTS, "send_redirects"),
1432 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_SOURCE_ROUTE,
1433 "accept_source_route"),
1434 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP, "proxy_arp"),
1435 DEVINET_SYSCTL_RW_ENTRY(MEDIUM_ID, "medium_id"),
1436 DEVINET_SYSCTL_RW_ENTRY(BOOTP_RELAY, "bootp_relay"),
1437 DEVINET_SYSCTL_RW_ENTRY(LOG_MARTIANS, "log_martians"),
1438 DEVINET_SYSCTL_RW_ENTRY(TAG, "tag"),
1439 DEVINET_SYSCTL_RW_ENTRY(ARPFILTER, "arp_filter"),
1440 DEVINET_SYSCTL_RW_ENTRY(ARP_ANNOUNCE, "arp_announce"),
1441 DEVINET_SYSCTL_RW_ENTRY(ARP_IGNORE, "arp_ignore"),
1442 DEVINET_SYSCTL_RW_ENTRY(ARP_ACCEPT, "arp_accept"),
1443
1444 DEVINET_SYSCTL_FLUSHING_ENTRY(NOXFRM, "disable_xfrm"),
1445 DEVINET_SYSCTL_FLUSHING_ENTRY(NOPOLICY, "disable_policy"),
1446 DEVINET_SYSCTL_FLUSHING_ENTRY(FORCE_IGMP_VERSION,
1447 "force_igmp_version"),
1448 DEVINET_SYSCTL_FLUSHING_ENTRY(PROMOTE_SECONDARIES,
1449 "promote_secondaries"),
Linus Torvalds1da177e2005-04-16 15:20:36 -07001450 },
Linus Torvalds1da177e2005-04-16 15:20:36 -07001451};
1452
Pavel Emelyanovea40b322007-12-16 13:30:07 -08001453static int __devinet_sysctl_register(struct net *net, char *dev_name,
1454 int ctl_name, struct ipv4_devconf *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001455{
1456 int i;
Pavel Emelyanov9fa89642007-12-02 00:17:46 +11001457 struct devinet_sysctl_table *t;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001458
Pavel Emelyanovbfada692007-12-02 00:57:08 +11001459#define DEVINET_CTL_PATH_DEV 3
1460
1461 struct ctl_path devinet_ctl_path[] = {
1462 { .procname = "net", .ctl_name = CTL_NET, },
1463 { .procname = "ipv4", .ctl_name = NET_IPV4, },
1464 { .procname = "conf", .ctl_name = NET_IPV4_CONF, },
1465 { /* to be set */ },
1466 { },
1467 };
1468
Pavel Emelyanov9fa89642007-12-02 00:17:46 +11001469 t = kmemdup(&devinet_sysctl, sizeof(*t), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001470 if (!t)
Pavel Emelyanov9fa89642007-12-02 00:17:46 +11001471 goto out;
1472
Linus Torvalds1da177e2005-04-16 15:20:36 -07001473 for (i = 0; i < ARRAY_SIZE(t->devinet_vars) - 1; i++) {
1474 t->devinet_vars[i].data += (char *)p - (char *)&ipv4_devconf;
Herbert Xu31be3082007-06-04 23:35:37 -07001475 t->devinet_vars[i].extra1 = p;
Pavel Emelyanovc0ce9fb2007-12-16 13:31:14 -08001476 t->devinet_vars[i].extra2 = net;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001477 }
1478
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001479 /*
1480 * Make a copy of dev_name, because '.procname' is regarded as const
Linus Torvalds1da177e2005-04-16 15:20:36 -07001481 * by sysctl and we wouldn't want anyone to change it under our feet
1482 * (see SIOCSIFNAME).
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001483 */
Pavel Emelyanovbfada692007-12-02 00:57:08 +11001484 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
1485 if (!t->dev_name)
Pavel Emelyanov9fa89642007-12-02 00:17:46 +11001486 goto free;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001487
Pavel Emelyanovbfada692007-12-02 00:57:08 +11001488 devinet_ctl_path[DEVINET_CTL_PATH_DEV].procname = t->dev_name;
1489 devinet_ctl_path[DEVINET_CTL_PATH_DEV].ctl_name = ctl_name;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001490
Pavel Emelyanov752d14d2007-12-16 13:31:47 -08001491 t->sysctl_header = register_net_sysctl_table(net, devinet_ctl_path,
Pavel Emelyanovbfada692007-12-02 00:57:08 +11001492 t->devinet_vars);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001493 if (!t->sysctl_header)
Pavel Emelyanov9fa89642007-12-02 00:17:46 +11001494 goto free_procname;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001495
1496 p->sysctl = t;
Pavel Emelyanovea40b322007-12-16 13:30:07 -08001497 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001498
Pavel Emelyanov9fa89642007-12-02 00:17:46 +11001499free_procname:
Pavel Emelyanovbfada692007-12-02 00:57:08 +11001500 kfree(t->dev_name);
Pavel Emelyanov9fa89642007-12-02 00:17:46 +11001501free:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001502 kfree(t);
Pavel Emelyanov9fa89642007-12-02 00:17:46 +11001503out:
Pavel Emelyanovea40b322007-12-16 13:30:07 -08001504 return -ENOBUFS;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001505}
1506
Pavel Emelyanov51602b22007-12-11 02:17:40 -08001507static void __devinet_sysctl_unregister(struct ipv4_devconf *cnf)
1508{
1509 struct devinet_sysctl_table *t = cnf->sysctl;
1510
1511 if (t == NULL)
1512 return;
1513
1514 cnf->sysctl = NULL;
1515 unregister_sysctl_table(t->sysctl_header);
1516 kfree(t->dev_name);
1517 kfree(t);
1518}
1519
Pavel Emelyanov66f27a52007-12-02 00:55:54 +11001520static void devinet_sysctl_register(struct in_device *idev)
1521{
Pavel Emelyanov51602b22007-12-11 02:17:40 -08001522 neigh_sysctl_register(idev->dev, idev->arp_parms, NET_IPV4,
1523 NET_IPV4_NEIGH, "ipv4", NULL, NULL);
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +09001524 __devinet_sysctl_register(dev_net(idev->dev), idev->dev->name,
Pavel Emelyanovc0ce9fb2007-12-16 13:31:14 -08001525 idev->dev->ifindex, &idev->cnf);
Pavel Emelyanov66f27a52007-12-02 00:55:54 +11001526}
1527
Pavel Emelyanov51602b22007-12-11 02:17:40 -08001528static void devinet_sysctl_unregister(struct in_device *idev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001529{
Pavel Emelyanov51602b22007-12-11 02:17:40 -08001530 __devinet_sysctl_unregister(&idev->cnf);
1531 neigh_sysctl_unregister(idev->arp_parms);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001532}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001533
Pavel Emelyanov68dd2992007-12-05 01:44:58 -08001534static struct ctl_table ctl_forward_entry[] = {
1535 {
1536 .ctl_name = NET_IPV4_FORWARD,
1537 .procname = "ip_forward",
1538 .data = &ipv4_devconf.data[
1539 NET_IPV4_CONF_FORWARDING - 1],
1540 .maxlen = sizeof(int),
1541 .mode = 0644,
1542 .proc_handler = devinet_sysctl_forward,
1543 .strategy = devinet_conf_sysctl,
1544 .extra1 = &ipv4_devconf,
Pavel Emelyanovc0ce9fb2007-12-16 13:31:14 -08001545 .extra2 = &init_net,
Pavel Emelyanov68dd2992007-12-05 01:44:58 -08001546 },
1547 { },
1548};
1549
Pavel Emelyanov752d14d2007-12-16 13:31:47 -08001550static __net_initdata struct ctl_path net_ipv4_path[] = {
Pavel Emelyanov68dd2992007-12-05 01:44:58 -08001551 { .procname = "net", .ctl_name = CTL_NET, },
1552 { .procname = "ipv4", .ctl_name = NET_IPV4, },
1553 { },
1554};
Eric Dumazet2a75de02008-01-05 23:08:49 -08001555#endif
Pavel Emelyanov68dd2992007-12-05 01:44:58 -08001556
Pavel Emelyanov752d14d2007-12-16 13:31:47 -08001557static __net_init int devinet_init_net(struct net *net)
1558{
1559 int err;
Pavel Emelyanov752d14d2007-12-16 13:31:47 -08001560 struct ipv4_devconf *all, *dflt;
Eric Dumazet2a75de02008-01-05 23:08:49 -08001561#ifdef CONFIG_SYSCTL
1562 struct ctl_table *tbl = ctl_forward_entry;
Pavel Emelyanov752d14d2007-12-16 13:31:47 -08001563 struct ctl_table_header *forw_hdr;
Eric Dumazet2a75de02008-01-05 23:08:49 -08001564#endif
Pavel Emelyanov752d14d2007-12-16 13:31:47 -08001565
1566 err = -ENOMEM;
1567 all = &ipv4_devconf;
1568 dflt = &ipv4_devconf_dflt;
Pavel Emelyanov752d14d2007-12-16 13:31:47 -08001569
1570 if (net != &init_net) {
1571 all = kmemdup(all, sizeof(ipv4_devconf), GFP_KERNEL);
1572 if (all == NULL)
1573 goto err_alloc_all;
1574
1575 dflt = kmemdup(dflt, sizeof(ipv4_devconf_dflt), GFP_KERNEL);
1576 if (dflt == NULL)
1577 goto err_alloc_dflt;
1578
Eric Dumazet2a75de02008-01-05 23:08:49 -08001579#ifdef CONFIG_SYSCTL
Pavel Emelyanov752d14d2007-12-16 13:31:47 -08001580 tbl = kmemdup(tbl, sizeof(ctl_forward_entry), GFP_KERNEL);
1581 if (tbl == NULL)
1582 goto err_alloc_ctl;
1583
1584 tbl[0].data = &all->data[NET_IPV4_CONF_FORWARDING - 1];
1585 tbl[0].extra1 = all;
1586 tbl[0].extra2 = net;
Eric Dumazet2a75de02008-01-05 23:08:49 -08001587#endif
Pavel Emelyanov752d14d2007-12-16 13:31:47 -08001588 }
1589
1590#ifdef CONFIG_SYSCTL
1591 err = __devinet_sysctl_register(net, "all",
1592 NET_PROTO_CONF_ALL, all);
1593 if (err < 0)
1594 goto err_reg_all;
1595
1596 err = __devinet_sysctl_register(net, "default",
1597 NET_PROTO_CONF_DEFAULT, dflt);
1598 if (err < 0)
1599 goto err_reg_dflt;
1600
1601 err = -ENOMEM;
1602 forw_hdr = register_net_sysctl_table(net, net_ipv4_path, tbl);
1603 if (forw_hdr == NULL)
1604 goto err_reg_ctl;
Eric Dumazet2a75de02008-01-05 23:08:49 -08001605 net->ipv4.forw_hdr = forw_hdr;
Pavel Emelyanov752d14d2007-12-16 13:31:47 -08001606#endif
1607
Pavel Emelyanov752d14d2007-12-16 13:31:47 -08001608 net->ipv4.devconf_all = all;
1609 net->ipv4.devconf_dflt = dflt;
1610 return 0;
1611
1612#ifdef CONFIG_SYSCTL
1613err_reg_ctl:
1614 __devinet_sysctl_unregister(dflt);
1615err_reg_dflt:
1616 __devinet_sysctl_unregister(all);
1617err_reg_all:
1618 if (tbl != ctl_forward_entry)
1619 kfree(tbl);
Pavel Emelyanov752d14d2007-12-16 13:31:47 -08001620err_alloc_ctl:
Eric Dumazet2a75de02008-01-05 23:08:49 -08001621#endif
Pavel Emelyanov752d14d2007-12-16 13:31:47 -08001622 if (dflt != &ipv4_devconf_dflt)
1623 kfree(dflt);
1624err_alloc_dflt:
1625 if (all != &ipv4_devconf)
1626 kfree(all);
1627err_alloc_all:
1628 return err;
1629}
1630
1631static __net_exit void devinet_exit_net(struct net *net)
1632{
Eric Dumazet2a75de02008-01-05 23:08:49 -08001633#ifdef CONFIG_SYSCTL
Pavel Emelyanov752d14d2007-12-16 13:31:47 -08001634 struct ctl_table *tbl;
1635
1636 tbl = net->ipv4.forw_hdr->ctl_table_arg;
Pavel Emelyanov752d14d2007-12-16 13:31:47 -08001637 unregister_net_sysctl_table(net->ipv4.forw_hdr);
1638 __devinet_sysctl_unregister(net->ipv4.devconf_dflt);
1639 __devinet_sysctl_unregister(net->ipv4.devconf_all);
Pavel Emelyanov752d14d2007-12-16 13:31:47 -08001640 kfree(tbl);
Eric Dumazet2a75de02008-01-05 23:08:49 -08001641#endif
Pavel Emelyanov752d14d2007-12-16 13:31:47 -08001642 kfree(net->ipv4.devconf_dflt);
1643 kfree(net->ipv4.devconf_all);
1644}
1645
1646static __net_initdata struct pernet_operations devinet_ops = {
1647 .init = devinet_init_net,
1648 .exit = devinet_exit_net,
1649};
1650
Linus Torvalds1da177e2005-04-16 15:20:36 -07001651void __init devinet_init(void)
1652{
Pavel Emelyanov752d14d2007-12-16 13:31:47 -08001653 register_pernet_subsys(&devinet_ops);
1654
Linus Torvalds1da177e2005-04-16 15:20:36 -07001655 register_gifconf(PF_INET, inet_gifconf);
1656 register_netdevice_notifier(&ip_netdev_notifier);
Thomas Graf63f34442007-03-22 11:55:17 -07001657
1658 rtnl_register(PF_INET, RTM_NEWADDR, inet_rtm_newaddr, NULL);
1659 rtnl_register(PF_INET, RTM_DELADDR, inet_rtm_deladdr, NULL);
1660 rtnl_register(PF_INET, RTM_GETADDR, NULL, inet_dump_ifaddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001661}
1662
Linus Torvalds1da177e2005-04-16 15:20:36 -07001663EXPORT_SYMBOL(in_dev_finish_destroy);
1664EXPORT_SYMBOL(inet_select_addr);
1665EXPORT_SYMBOL(inetdev_by_index);
1666EXPORT_SYMBOL(register_inetaddr_notifier);
1667EXPORT_SYMBOL(unregister_inetaddr_notifier);