Commit | Line | Data |
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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> | |
58 | ||
14c85021 | 59 | #include <net/arp.h> |
1da177e4 LT |
60 | #include <net/ip.h> |
61 | #include <net/route.h> | |
62 | #include <net/ip_fib.h> | |
63f3444f | 63 | #include <net/rtnetlink.h> |
752d14dc | 64 | #include <net/net_namespace.h> |
1da177e4 | 65 | |
406b6f97 DM |
66 | #include "fib_lookup.h" |
67 | ||
0027ba84 | 68 | static struct ipv4_devconf ipv4_devconf = { |
42f811b8 | 69 | .data = { |
02291680 EB |
70 | [IPV4_DEVCONF_ACCEPT_REDIRECTS - 1] = 1, |
71 | [IPV4_DEVCONF_SEND_REDIRECTS - 1] = 1, | |
72 | [IPV4_DEVCONF_SECURE_REDIRECTS - 1] = 1, | |
73 | [IPV4_DEVCONF_SHARED_MEDIA - 1] = 1, | |
42f811b8 | 74 | }, |
1da177e4 LT |
75 | }; |
76 | ||
77 | static struct ipv4_devconf ipv4_devconf_dflt = { | |
42f811b8 | 78 | .data = { |
02291680 EB |
79 | [IPV4_DEVCONF_ACCEPT_REDIRECTS - 1] = 1, |
80 | [IPV4_DEVCONF_SEND_REDIRECTS - 1] = 1, | |
81 | [IPV4_DEVCONF_SECURE_REDIRECTS - 1] = 1, | |
82 | [IPV4_DEVCONF_SHARED_MEDIA - 1] = 1, | |
83 | [IPV4_DEVCONF_ACCEPT_SOURCE_ROUTE - 1] = 1, | |
42f811b8 | 84 | }, |
1da177e4 LT |
85 | }; |
86 | ||
9355bbd6 PE |
87 | #define IPV4_DEVCONF_DFLT(net, attr) \ |
88 | IPV4_DEVCONF((*net->ipv4.devconf_dflt), attr) | |
42f811b8 | 89 | |
ef7c79ed | 90 | static const struct nla_policy ifa_ipv4_policy[IFA_MAX+1] = { |
5c753978 TG |
91 | [IFA_LOCAL] = { .type = NLA_U32 }, |
92 | [IFA_ADDRESS] = { .type = NLA_U32 }, | |
93 | [IFA_BROADCAST] = { .type = NLA_U32 }, | |
5176f91e | 94 | [IFA_LABEL] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, |
5c753978 TG |
95 | }; |
96 | ||
fd23c3b3 DM |
97 | /* inet_addr_hash's shifting is dependent upon this IN4_ADDR_HSIZE |
98 | * value. So if you change this define, make appropriate changes to | |
99 | * inet_addr_hash as well. | |
100 | */ | |
101 | #define IN4_ADDR_HSIZE 256 | |
102 | static struct hlist_head inet_addr_lst[IN4_ADDR_HSIZE]; | |
103 | static DEFINE_SPINLOCK(inet_addr_hash_lock); | |
104 | ||
105 | static inline unsigned int inet_addr_hash(struct net *net, __be32 addr) | |
106 | { | |
107 | u32 val = (__force u32) addr ^ hash_ptr(net, 8); | |
108 | ||
109 | return ((val ^ (val >> 8) ^ (val >> 16) ^ (val >> 24)) & | |
110 | (IN4_ADDR_HSIZE - 1)); | |
111 | } | |
112 | ||
113 | static void inet_hash_insert(struct net *net, struct in_ifaddr *ifa) | |
114 | { | |
e066008b | 115 | unsigned int hash = inet_addr_hash(net, ifa->ifa_local); |
fd23c3b3 DM |
116 | |
117 | spin_lock(&inet_addr_hash_lock); | |
118 | hlist_add_head_rcu(&ifa->hash, &inet_addr_lst[hash]); | |
119 | spin_unlock(&inet_addr_hash_lock); | |
120 | } | |
121 | ||
122 | static void inet_hash_remove(struct in_ifaddr *ifa) | |
123 | { | |
124 | spin_lock(&inet_addr_hash_lock); | |
125 | hlist_del_init_rcu(&ifa->hash); | |
126 | spin_unlock(&inet_addr_hash_lock); | |
127 | } | |
128 | ||
9435eb1c DM |
129 | /** |
130 | * __ip_dev_find - find the first device with a given source address. | |
131 | * @net: the net namespace | |
132 | * @addr: the source address | |
133 | * @devref: if true, take a reference on the found device | |
134 | * | |
135 | * If a caller uses devref=false, it should be protected by RCU, or RTNL | |
136 | */ | |
137 | struct net_device *__ip_dev_find(struct net *net, __be32 addr, bool devref) | |
138 | { | |
139 | unsigned int hash = inet_addr_hash(net, addr); | |
140 | struct net_device *result = NULL; | |
141 | struct in_ifaddr *ifa; | |
142 | struct hlist_node *node; | |
143 | ||
144 | rcu_read_lock(); | |
145 | hlist_for_each_entry_rcu(ifa, node, &inet_addr_lst[hash], hash) { | |
146 | struct net_device *dev = ifa->ifa_dev->dev; | |
147 | ||
148 | if (!net_eq(dev_net(dev), net)) | |
149 | continue; | |
e066008b | 150 | if (ifa->ifa_local == addr) { |
9435eb1c DM |
151 | result = dev; |
152 | break; | |
153 | } | |
154 | } | |
406b6f97 DM |
155 | if (!result) { |
156 | struct flowi4 fl4 = { .daddr = addr }; | |
157 | struct fib_result res = { 0 }; | |
158 | struct fib_table *local; | |
159 | ||
160 | /* Fallback to FIB local table so that communication | |
161 | * over loopback subnets work. | |
162 | */ | |
163 | local = fib_get_table(net, RT_TABLE_LOCAL); | |
164 | if (local && | |
165 | !fib_table_lookup(local, &fl4, &res, FIB_LOOKUP_NOREF) && | |
166 | res.type == RTN_LOCAL) | |
167 | result = FIB_RES_DEV(res); | |
168 | } | |
9435eb1c DM |
169 | if (result && devref) |
170 | dev_hold(result); | |
171 | rcu_read_unlock(); | |
172 | return result; | |
173 | } | |
174 | EXPORT_SYMBOL(__ip_dev_find); | |
175 | ||
d6062cbb | 176 | static void rtmsg_ifa(int event, struct in_ifaddr *, struct nlmsghdr *, u32); |
1da177e4 | 177 | |
e041c683 | 178 | static BLOCKING_NOTIFIER_HEAD(inetaddr_chain); |
1da177e4 LT |
179 | static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap, |
180 | int destroy); | |
181 | #ifdef CONFIG_SYSCTL | |
66f27a52 | 182 | static void devinet_sysctl_register(struct in_device *idev); |
51602b2a PE |
183 | static void devinet_sysctl_unregister(struct in_device *idev); |
184 | #else | |
185 | static inline void devinet_sysctl_register(struct in_device *idev) | |
186 | { | |
187 | } | |
188 | static inline void devinet_sysctl_unregister(struct in_device *idev) | |
189 | { | |
190 | } | |
1da177e4 LT |
191 | #endif |
192 | ||
193 | /* Locks all the inet devices. */ | |
194 | ||
195 | static struct in_ifaddr *inet_alloc_ifa(void) | |
196 | { | |
93adcc80 | 197 | return kzalloc(sizeof(struct in_ifaddr), GFP_KERNEL); |
1da177e4 LT |
198 | } |
199 | ||
200 | static void inet_rcu_free_ifa(struct rcu_head *head) | |
201 | { | |
202 | struct in_ifaddr *ifa = container_of(head, struct in_ifaddr, rcu_head); | |
203 | if (ifa->ifa_dev) | |
204 | in_dev_put(ifa->ifa_dev); | |
205 | kfree(ifa); | |
206 | } | |
207 | ||
208 | static inline void inet_free_ifa(struct in_ifaddr *ifa) | |
209 | { | |
210 | call_rcu(&ifa->rcu_head, inet_rcu_free_ifa); | |
211 | } | |
212 | ||
213 | void in_dev_finish_destroy(struct in_device *idev) | |
214 | { | |
215 | struct net_device *dev = idev->dev; | |
216 | ||
547b792c IJ |
217 | WARN_ON(idev->ifa_list); |
218 | WARN_ON(idev->mc_list); | |
1da177e4 LT |
219 | #ifdef NET_REFCNT_DEBUG |
220 | printk(KERN_DEBUG "in_dev_finish_destroy: %p=%s\n", | |
221 | idev, dev ? dev->name : "NIL"); | |
222 | #endif | |
223 | dev_put(dev); | |
224 | if (!idev->dead) | |
9f9354b9 ED |
225 | pr_err("Freeing alive in_device %p\n", idev); |
226 | else | |
1da177e4 | 227 | kfree(idev); |
1da177e4 | 228 | } |
9f9354b9 | 229 | EXPORT_SYMBOL(in_dev_finish_destroy); |
1da177e4 | 230 | |
71e27da9 | 231 | static struct in_device *inetdev_init(struct net_device *dev) |
1da177e4 LT |
232 | { |
233 | struct in_device *in_dev; | |
234 | ||
235 | ASSERT_RTNL(); | |
236 | ||
0da974f4 | 237 | in_dev = kzalloc(sizeof(*in_dev), GFP_KERNEL); |
1da177e4 LT |
238 | if (!in_dev) |
239 | goto out; | |
c346dca1 | 240 | memcpy(&in_dev->cnf, dev_net(dev)->ipv4.devconf_dflt, |
9355bbd6 | 241 | sizeof(in_dev->cnf)); |
1da177e4 LT |
242 | in_dev->cnf.sysctl = NULL; |
243 | in_dev->dev = dev; | |
9f9354b9 ED |
244 | in_dev->arp_parms = neigh_parms_alloc(dev, &arp_tbl); |
245 | if (!in_dev->arp_parms) | |
1da177e4 | 246 | goto out_kfree; |
0187bdfb BH |
247 | if (IPV4_DEVCONF(in_dev->cnf, FORWARDING)) |
248 | dev_disable_lro(dev); | |
1da177e4 LT |
249 | /* Reference in_dev->dev */ |
250 | dev_hold(dev); | |
30c4cf57 | 251 | /* Account for reference dev->ip_ptr (below) */ |
1da177e4 | 252 | in_dev_hold(in_dev); |
1da177e4 | 253 | |
66f27a52 | 254 | devinet_sysctl_register(in_dev); |
1da177e4 LT |
255 | ip_mc_init_dev(in_dev); |
256 | if (dev->flags & IFF_UP) | |
257 | ip_mc_up(in_dev); | |
483479ec | 258 | |
30c4cf57 | 259 | /* we can receive as soon as ip_ptr is set -- do this last */ |
cf778b00 | 260 | rcu_assign_pointer(dev->ip_ptr, in_dev); |
483479ec | 261 | out: |
1da177e4 LT |
262 | return in_dev; |
263 | out_kfree: | |
264 | kfree(in_dev); | |
265 | in_dev = NULL; | |
266 | goto out; | |
267 | } | |
268 | ||
269 | static void in_dev_rcu_put(struct rcu_head *head) | |
270 | { | |
271 | struct in_device *idev = container_of(head, struct in_device, rcu_head); | |
272 | in_dev_put(idev); | |
273 | } | |
274 | ||
275 | static void inetdev_destroy(struct in_device *in_dev) | |
276 | { | |
277 | struct in_ifaddr *ifa; | |
278 | struct net_device *dev; | |
279 | ||
280 | ASSERT_RTNL(); | |
281 | ||
282 | dev = in_dev->dev; | |
1da177e4 LT |
283 | |
284 | in_dev->dead = 1; | |
285 | ||
286 | ip_mc_destroy_dev(in_dev); | |
287 | ||
288 | while ((ifa = in_dev->ifa_list) != NULL) { | |
289 | inet_del_ifa(in_dev, &in_dev->ifa_list, 0); | |
290 | inet_free_ifa(ifa); | |
291 | } | |
292 | ||
a9b3cd7f | 293 | RCU_INIT_POINTER(dev->ip_ptr, NULL); |
1da177e4 | 294 | |
51602b2a | 295 | devinet_sysctl_unregister(in_dev); |
1da177e4 LT |
296 | neigh_parms_release(&arp_tbl, in_dev->arp_parms); |
297 | arp_ifdown(dev); | |
298 | ||
299 | call_rcu(&in_dev->rcu_head, in_dev_rcu_put); | |
300 | } | |
301 | ||
ff428d72 | 302 | int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b) |
1da177e4 LT |
303 | { |
304 | rcu_read_lock(); | |
305 | for_primary_ifa(in_dev) { | |
306 | if (inet_ifa_match(a, ifa)) { | |
307 | if (!b || inet_ifa_match(b, ifa)) { | |
308 | rcu_read_unlock(); | |
309 | return 1; | |
310 | } | |
311 | } | |
312 | } endfor_ifa(in_dev); | |
313 | rcu_read_unlock(); | |
314 | return 0; | |
315 | } | |
316 | ||
d6062cbb TG |
317 | static void __inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap, |
318 | int destroy, struct nlmsghdr *nlh, u32 pid) | |
1da177e4 | 319 | { |
8f937c60 | 320 | struct in_ifaddr *promote = NULL; |
0ff60a45 JHS |
321 | struct in_ifaddr *ifa, *ifa1 = *ifap; |
322 | struct in_ifaddr *last_prim = in_dev->ifa_list; | |
323 | struct in_ifaddr *prev_prom = NULL; | |
324 | int do_promote = IN_DEV_PROMOTE_SECONDARIES(in_dev); | |
1da177e4 LT |
325 | |
326 | ASSERT_RTNL(); | |
327 | ||
e905a9ed | 328 | /* 1. Deleting primary ifaddr forces deletion all secondaries |
8f937c60 HW |
329 | * unless alias promotion is set |
330 | **/ | |
1da177e4 LT |
331 | |
332 | if (!(ifa1->ifa_flags & IFA_F_SECONDARY)) { | |
1da177e4 LT |
333 | struct in_ifaddr **ifap1 = &ifa1->ifa_next; |
334 | ||
335 | while ((ifa = *ifap1) != NULL) { | |
e905a9ed | 336 | if (!(ifa->ifa_flags & IFA_F_SECONDARY) && |
0ff60a45 JHS |
337 | ifa1->ifa_scope <= ifa->ifa_scope) |
338 | last_prim = ifa; | |
339 | ||
1da177e4 LT |
340 | if (!(ifa->ifa_flags & IFA_F_SECONDARY) || |
341 | ifa1->ifa_mask != ifa->ifa_mask || | |
342 | !inet_ifa_match(ifa1->ifa_address, ifa)) { | |
343 | ifap1 = &ifa->ifa_next; | |
0ff60a45 | 344 | prev_prom = ifa; |
1da177e4 LT |
345 | continue; |
346 | } | |
347 | ||
0ff60a45 | 348 | if (!do_promote) { |
fd23c3b3 | 349 | inet_hash_remove(ifa); |
8f937c60 | 350 | *ifap1 = ifa->ifa_next; |
1da177e4 | 351 | |
d6062cbb | 352 | rtmsg_ifa(RTM_DELADDR, ifa, nlh, pid); |
e041c683 AS |
353 | blocking_notifier_call_chain(&inetaddr_chain, |
354 | NETDEV_DOWN, ifa); | |
8f937c60 HW |
355 | inet_free_ifa(ifa); |
356 | } else { | |
357 | promote = ifa; | |
358 | break; | |
359 | } | |
1da177e4 LT |
360 | } |
361 | } | |
362 | ||
2d230e2b JA |
363 | /* On promotion all secondaries from subnet are changing |
364 | * the primary IP, we must remove all their routes silently | |
365 | * and later to add them back with new prefsrc. Do this | |
366 | * while all addresses are on the device list. | |
367 | */ | |
368 | for (ifa = promote; ifa; ifa = ifa->ifa_next) { | |
369 | if (ifa1->ifa_mask == ifa->ifa_mask && | |
370 | inet_ifa_match(ifa1->ifa_address, ifa)) | |
371 | fib_del_ifaddr(ifa, ifa1); | |
372 | } | |
373 | ||
1da177e4 LT |
374 | /* 2. Unlink it */ |
375 | ||
376 | *ifap = ifa1->ifa_next; | |
fd23c3b3 | 377 | inet_hash_remove(ifa1); |
1da177e4 LT |
378 | |
379 | /* 3. Announce address deletion */ | |
380 | ||
381 | /* Send message first, then call notifier. | |
382 | At first sight, FIB update triggered by notifier | |
383 | will refer to already deleted ifaddr, that could confuse | |
384 | netlink listeners. It is not true: look, gated sees | |
385 | that route deleted and if it still thinks that ifaddr | |
386 | is valid, it will try to restore deleted routes... Grr. | |
387 | So that, this order is correct. | |
388 | */ | |
d6062cbb | 389 | rtmsg_ifa(RTM_DELADDR, ifa1, nlh, pid); |
e041c683 | 390 | blocking_notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa1); |
1da177e4 | 391 | |
0ff60a45 | 392 | if (promote) { |
04024b93 | 393 | struct in_ifaddr *next_sec = promote->ifa_next; |
0ff60a45 JHS |
394 | |
395 | if (prev_prom) { | |
396 | prev_prom->ifa_next = promote->ifa_next; | |
397 | promote->ifa_next = last_prim->ifa_next; | |
398 | last_prim->ifa_next = promote; | |
399 | } | |
8f937c60 | 400 | |
8f937c60 | 401 | promote->ifa_flags &= ~IFA_F_SECONDARY; |
d6062cbb | 402 | rtmsg_ifa(RTM_NEWADDR, promote, nlh, pid); |
e041c683 AS |
403 | blocking_notifier_call_chain(&inetaddr_chain, |
404 | NETDEV_UP, promote); | |
04024b93 | 405 | for (ifa = next_sec; ifa; ifa = ifa->ifa_next) { |
0ff60a45 JHS |
406 | if (ifa1->ifa_mask != ifa->ifa_mask || |
407 | !inet_ifa_match(ifa1->ifa_address, ifa)) | |
408 | continue; | |
409 | fib_add_ifaddr(ifa); | |
410 | } | |
411 | ||
412 | } | |
6363097c | 413 | if (destroy) |
0ff60a45 | 414 | inet_free_ifa(ifa1); |
1da177e4 LT |
415 | } |
416 | ||
d6062cbb TG |
417 | static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap, |
418 | int destroy) | |
419 | { | |
420 | __inet_del_ifa(in_dev, ifap, destroy, NULL, 0); | |
421 | } | |
422 | ||
423 | static int __inet_insert_ifa(struct in_ifaddr *ifa, struct nlmsghdr *nlh, | |
424 | u32 pid) | |
1da177e4 LT |
425 | { |
426 | struct in_device *in_dev = ifa->ifa_dev; | |
427 | struct in_ifaddr *ifa1, **ifap, **last_primary; | |
428 | ||
429 | ASSERT_RTNL(); | |
430 | ||
431 | if (!ifa->ifa_local) { | |
432 | inet_free_ifa(ifa); | |
433 | return 0; | |
434 | } | |
435 | ||
436 | ifa->ifa_flags &= ~IFA_F_SECONDARY; | |
437 | last_primary = &in_dev->ifa_list; | |
438 | ||
439 | for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL; | |
440 | ifap = &ifa1->ifa_next) { | |
441 | if (!(ifa1->ifa_flags & IFA_F_SECONDARY) && | |
442 | ifa->ifa_scope <= ifa1->ifa_scope) | |
443 | last_primary = &ifa1->ifa_next; | |
444 | if (ifa1->ifa_mask == ifa->ifa_mask && | |
445 | inet_ifa_match(ifa1->ifa_address, ifa)) { | |
446 | if (ifa1->ifa_local == ifa->ifa_local) { | |
447 | inet_free_ifa(ifa); | |
448 | return -EEXIST; | |
449 | } | |
450 | if (ifa1->ifa_scope != ifa->ifa_scope) { | |
451 | inet_free_ifa(ifa); | |
452 | return -EINVAL; | |
453 | } | |
454 | ifa->ifa_flags |= IFA_F_SECONDARY; | |
455 | } | |
456 | } | |
457 | ||
458 | if (!(ifa->ifa_flags & IFA_F_SECONDARY)) { | |
459 | net_srandom(ifa->ifa_local); | |
460 | ifap = last_primary; | |
461 | } | |
462 | ||
463 | ifa->ifa_next = *ifap; | |
464 | *ifap = ifa; | |
465 | ||
fd23c3b3 DM |
466 | inet_hash_insert(dev_net(in_dev->dev), ifa); |
467 | ||
1da177e4 LT |
468 | /* Send message first, then call notifier. |
469 | Notifier will trigger FIB update, so that | |
470 | listeners of netlink will know about new ifaddr */ | |
d6062cbb | 471 | rtmsg_ifa(RTM_NEWADDR, ifa, nlh, pid); |
e041c683 | 472 | blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa); |
1da177e4 LT |
473 | |
474 | return 0; | |
475 | } | |
476 | ||
d6062cbb TG |
477 | static int inet_insert_ifa(struct in_ifaddr *ifa) |
478 | { | |
479 | return __inet_insert_ifa(ifa, NULL, 0); | |
480 | } | |
481 | ||
1da177e4 LT |
482 | static int inet_set_ifa(struct net_device *dev, struct in_ifaddr *ifa) |
483 | { | |
e5ed6399 | 484 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
1da177e4 LT |
485 | |
486 | ASSERT_RTNL(); | |
487 | ||
488 | if (!in_dev) { | |
71e27da9 HX |
489 | inet_free_ifa(ifa); |
490 | return -ENOBUFS; | |
1da177e4 | 491 | } |
71e27da9 | 492 | ipv4_devconf_setall(in_dev); |
1da177e4 | 493 | if (ifa->ifa_dev != in_dev) { |
547b792c | 494 | WARN_ON(ifa->ifa_dev); |
1da177e4 LT |
495 | in_dev_hold(in_dev); |
496 | ifa->ifa_dev = in_dev; | |
497 | } | |
f97c1e0c | 498 | if (ipv4_is_loopback(ifa->ifa_local)) |
1da177e4 LT |
499 | ifa->ifa_scope = RT_SCOPE_HOST; |
500 | return inet_insert_ifa(ifa); | |
501 | } | |
502 | ||
8723e1b4 ED |
503 | /* Caller must hold RCU or RTNL : |
504 | * We dont take a reference on found in_device | |
505 | */ | |
7fee0ca2 | 506 | struct in_device *inetdev_by_index(struct net *net, int ifindex) |
1da177e4 LT |
507 | { |
508 | struct net_device *dev; | |
509 | struct in_device *in_dev = NULL; | |
c148fc2e ED |
510 | |
511 | rcu_read_lock(); | |
512 | dev = dev_get_by_index_rcu(net, ifindex); | |
1da177e4 | 513 | if (dev) |
8723e1b4 | 514 | in_dev = rcu_dereference_rtnl(dev->ip_ptr); |
c148fc2e | 515 | rcu_read_unlock(); |
1da177e4 LT |
516 | return in_dev; |
517 | } | |
9f9354b9 | 518 | EXPORT_SYMBOL(inetdev_by_index); |
1da177e4 LT |
519 | |
520 | /* Called only from RTNL semaphored context. No locks. */ | |
521 | ||
60cad5da AV |
522 | struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix, |
523 | __be32 mask) | |
1da177e4 LT |
524 | { |
525 | ASSERT_RTNL(); | |
526 | ||
527 | for_primary_ifa(in_dev) { | |
528 | if (ifa->ifa_mask == mask && inet_ifa_match(prefix, ifa)) | |
529 | return ifa; | |
530 | } endfor_ifa(in_dev); | |
531 | return NULL; | |
532 | } | |
533 | ||
534 | static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) | |
535 | { | |
3b1e0a65 | 536 | struct net *net = sock_net(skb->sk); |
dfdd5fd4 | 537 | struct nlattr *tb[IFA_MAX+1]; |
1da177e4 | 538 | struct in_device *in_dev; |
dfdd5fd4 | 539 | struct ifaddrmsg *ifm; |
1da177e4 | 540 | struct in_ifaddr *ifa, **ifap; |
dfdd5fd4 | 541 | int err = -EINVAL; |
1da177e4 LT |
542 | |
543 | ASSERT_RTNL(); | |
544 | ||
dfdd5fd4 TG |
545 | err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy); |
546 | if (err < 0) | |
547 | goto errout; | |
548 | ||
549 | ifm = nlmsg_data(nlh); | |
7fee0ca2 | 550 | in_dev = inetdev_by_index(net, ifm->ifa_index); |
dfdd5fd4 TG |
551 | if (in_dev == NULL) { |
552 | err = -ENODEV; | |
553 | goto errout; | |
554 | } | |
555 | ||
1da177e4 LT |
556 | for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; |
557 | ifap = &ifa->ifa_next) { | |
dfdd5fd4 | 558 | if (tb[IFA_LOCAL] && |
a7a628c4 | 559 | ifa->ifa_local != nla_get_be32(tb[IFA_LOCAL])) |
dfdd5fd4 TG |
560 | continue; |
561 | ||
562 | if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label)) | |
1da177e4 | 563 | continue; |
dfdd5fd4 TG |
564 | |
565 | if (tb[IFA_ADDRESS] && | |
566 | (ifm->ifa_prefixlen != ifa->ifa_prefixlen || | |
a7a628c4 | 567 | !inet_ifa_match(nla_get_be32(tb[IFA_ADDRESS]), ifa))) |
dfdd5fd4 TG |
568 | continue; |
569 | ||
d6062cbb | 570 | __inet_del_ifa(in_dev, ifap, 1, nlh, NETLINK_CB(skb).pid); |
1da177e4 LT |
571 | return 0; |
572 | } | |
dfdd5fd4 TG |
573 | |
574 | err = -EADDRNOTAVAIL; | |
575 | errout: | |
576 | return err; | |
1da177e4 LT |
577 | } |
578 | ||
4b8aa9ab | 579 | static struct in_ifaddr *rtm_to_ifaddr(struct net *net, struct nlmsghdr *nlh) |
1da177e4 | 580 | { |
5c753978 TG |
581 | struct nlattr *tb[IFA_MAX+1]; |
582 | struct in_ifaddr *ifa; | |
583 | struct ifaddrmsg *ifm; | |
1da177e4 LT |
584 | struct net_device *dev; |
585 | struct in_device *in_dev; | |
7b218574 | 586 | int err; |
1da177e4 | 587 | |
5c753978 TG |
588 | err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy); |
589 | if (err < 0) | |
590 | goto errout; | |
1da177e4 | 591 | |
5c753978 | 592 | ifm = nlmsg_data(nlh); |
7b218574 DL |
593 | err = -EINVAL; |
594 | if (ifm->ifa_prefixlen > 32 || tb[IFA_LOCAL] == NULL) | |
5c753978 | 595 | goto errout; |
1da177e4 | 596 | |
4b8aa9ab | 597 | dev = __dev_get_by_index(net, ifm->ifa_index); |
7b218574 DL |
598 | err = -ENODEV; |
599 | if (dev == NULL) | |
5c753978 | 600 | goto errout; |
1da177e4 | 601 | |
5c753978 | 602 | in_dev = __in_dev_get_rtnl(dev); |
7b218574 DL |
603 | err = -ENOBUFS; |
604 | if (in_dev == NULL) | |
71e27da9 | 605 | goto errout; |
1da177e4 | 606 | |
5c753978 | 607 | ifa = inet_alloc_ifa(); |
7b218574 | 608 | if (ifa == NULL) |
5c753978 TG |
609 | /* |
610 | * A potential indev allocation can be left alive, it stays | |
611 | * assigned to its device and is destroy with it. | |
612 | */ | |
5c753978 | 613 | goto errout; |
5c753978 | 614 | |
a4e65d36 | 615 | ipv4_devconf_setall(in_dev); |
5c753978 TG |
616 | in_dev_hold(in_dev); |
617 | ||
618 | if (tb[IFA_ADDRESS] == NULL) | |
619 | tb[IFA_ADDRESS] = tb[IFA_LOCAL]; | |
1da177e4 | 620 | |
fd23c3b3 | 621 | INIT_HLIST_NODE(&ifa->hash); |
1da177e4 LT |
622 | ifa->ifa_prefixlen = ifm->ifa_prefixlen; |
623 | ifa->ifa_mask = inet_make_mask(ifm->ifa_prefixlen); | |
1da177e4 LT |
624 | ifa->ifa_flags = ifm->ifa_flags; |
625 | ifa->ifa_scope = ifm->ifa_scope; | |
5c753978 TG |
626 | ifa->ifa_dev = in_dev; |
627 | ||
a7a628c4 AV |
628 | ifa->ifa_local = nla_get_be32(tb[IFA_LOCAL]); |
629 | ifa->ifa_address = nla_get_be32(tb[IFA_ADDRESS]); | |
5c753978 TG |
630 | |
631 | if (tb[IFA_BROADCAST]) | |
a7a628c4 | 632 | ifa->ifa_broadcast = nla_get_be32(tb[IFA_BROADCAST]); |
5c753978 | 633 | |
5c753978 TG |
634 | if (tb[IFA_LABEL]) |
635 | nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ); | |
1da177e4 LT |
636 | else |
637 | memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); | |
638 | ||
5c753978 TG |
639 | return ifa; |
640 | ||
641 | errout: | |
642 | return ERR_PTR(err); | |
643 | } | |
644 | ||
645 | static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) | |
646 | { | |
3b1e0a65 | 647 | struct net *net = sock_net(skb->sk); |
5c753978 TG |
648 | struct in_ifaddr *ifa; |
649 | ||
650 | ASSERT_RTNL(); | |
651 | ||
4b8aa9ab | 652 | ifa = rtm_to_ifaddr(net, nlh); |
5c753978 TG |
653 | if (IS_ERR(ifa)) |
654 | return PTR_ERR(ifa); | |
655 | ||
d6062cbb | 656 | return __inet_insert_ifa(ifa, nlh, NETLINK_CB(skb).pid); |
1da177e4 LT |
657 | } |
658 | ||
659 | /* | |
660 | * Determine a default network mask, based on the IP address. | |
661 | */ | |
662 | ||
9f9354b9 | 663 | static inline int inet_abc_len(__be32 addr) |
1da177e4 LT |
664 | { |
665 | int rc = -1; /* Something else, probably a multicast. */ | |
666 | ||
f97c1e0c | 667 | if (ipv4_is_zeronet(addr)) |
e905a9ed | 668 | rc = 0; |
1da177e4 | 669 | else { |
714e85be | 670 | __u32 haddr = ntohl(addr); |
1da177e4 | 671 | |
714e85be | 672 | if (IN_CLASSA(haddr)) |
1da177e4 | 673 | rc = 8; |
714e85be | 674 | else if (IN_CLASSB(haddr)) |
1da177e4 | 675 | rc = 16; |
714e85be | 676 | else if (IN_CLASSC(haddr)) |
1da177e4 LT |
677 | rc = 24; |
678 | } | |
679 | ||
e905a9ed | 680 | return rc; |
1da177e4 LT |
681 | } |
682 | ||
683 | ||
e5b13cb1 | 684 | int devinet_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
1da177e4 LT |
685 | { |
686 | struct ifreq ifr; | |
687 | struct sockaddr_in sin_orig; | |
688 | struct sockaddr_in *sin = (struct sockaddr_in *)&ifr.ifr_addr; | |
689 | struct in_device *in_dev; | |
690 | struct in_ifaddr **ifap = NULL; | |
691 | struct in_ifaddr *ifa = NULL; | |
692 | struct net_device *dev; | |
693 | char *colon; | |
694 | int ret = -EFAULT; | |
695 | int tryaddrmatch = 0; | |
696 | ||
697 | /* | |
698 | * Fetch the caller's info block into kernel space | |
699 | */ | |
700 | ||
701 | if (copy_from_user(&ifr, arg, sizeof(struct ifreq))) | |
702 | goto out; | |
703 | ifr.ifr_name[IFNAMSIZ - 1] = 0; | |
704 | ||
705 | /* save original address for comparison */ | |
706 | memcpy(&sin_orig, sin, sizeof(*sin)); | |
707 | ||
708 | colon = strchr(ifr.ifr_name, ':'); | |
709 | if (colon) | |
710 | *colon = 0; | |
711 | ||
e5b13cb1 | 712 | dev_load(net, ifr.ifr_name); |
1da177e4 | 713 | |
132adf54 | 714 | switch (cmd) { |
1da177e4 LT |
715 | case SIOCGIFADDR: /* Get interface address */ |
716 | case SIOCGIFBRDADDR: /* Get the broadcast address */ | |
717 | case SIOCGIFDSTADDR: /* Get the destination address */ | |
718 | case SIOCGIFNETMASK: /* Get the netmask for the interface */ | |
719 | /* Note that these ioctls will not sleep, | |
720 | so that we do not impose a lock. | |
721 | One day we will be forced to put shlock here (I mean SMP) | |
722 | */ | |
723 | tryaddrmatch = (sin_orig.sin_family == AF_INET); | |
724 | memset(sin, 0, sizeof(*sin)); | |
725 | sin->sin_family = AF_INET; | |
726 | break; | |
727 | ||
728 | case SIOCSIFFLAGS: | |
729 | ret = -EACCES; | |
730 | if (!capable(CAP_NET_ADMIN)) | |
731 | goto out; | |
732 | break; | |
733 | case SIOCSIFADDR: /* Set interface address (and family) */ | |
734 | case SIOCSIFBRDADDR: /* Set the broadcast address */ | |
735 | case SIOCSIFDSTADDR: /* Set the destination address */ | |
736 | case SIOCSIFNETMASK: /* Set the netmask for the interface */ | |
737 | ret = -EACCES; | |
738 | if (!capable(CAP_NET_ADMIN)) | |
739 | goto out; | |
740 | ret = -EINVAL; | |
741 | if (sin->sin_family != AF_INET) | |
742 | goto out; | |
743 | break; | |
744 | default: | |
745 | ret = -EINVAL; | |
746 | goto out; | |
747 | } | |
748 | ||
749 | rtnl_lock(); | |
750 | ||
751 | ret = -ENODEV; | |
9f9354b9 ED |
752 | dev = __dev_get_by_name(net, ifr.ifr_name); |
753 | if (!dev) | |
1da177e4 LT |
754 | goto done; |
755 | ||
756 | if (colon) | |
757 | *colon = ':'; | |
758 | ||
9f9354b9 ED |
759 | in_dev = __in_dev_get_rtnl(dev); |
760 | if (in_dev) { | |
1da177e4 LT |
761 | if (tryaddrmatch) { |
762 | /* Matthias Andree */ | |
763 | /* compare label and address (4.4BSD style) */ | |
764 | /* note: we only do this for a limited set of ioctls | |
765 | and only if the original address family was AF_INET. | |
766 | This is checked above. */ | |
767 | for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; | |
768 | ifap = &ifa->ifa_next) { | |
769 | if (!strcmp(ifr.ifr_name, ifa->ifa_label) && | |
770 | sin_orig.sin_addr.s_addr == | |
6c91afe1 | 771 | ifa->ifa_local) { |
1da177e4 LT |
772 | break; /* found */ |
773 | } | |
774 | } | |
775 | } | |
776 | /* we didn't get a match, maybe the application is | |
777 | 4.3BSD-style and passed in junk so we fall back to | |
778 | comparing just the label */ | |
779 | if (!ifa) { | |
780 | for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; | |
781 | ifap = &ifa->ifa_next) | |
782 | if (!strcmp(ifr.ifr_name, ifa->ifa_label)) | |
783 | break; | |
784 | } | |
785 | } | |
786 | ||
787 | ret = -EADDRNOTAVAIL; | |
788 | if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS) | |
789 | goto done; | |
790 | ||
132adf54 | 791 | switch (cmd) { |
1da177e4 LT |
792 | case SIOCGIFADDR: /* Get interface address */ |
793 | sin->sin_addr.s_addr = ifa->ifa_local; | |
794 | goto rarok; | |
795 | ||
796 | case SIOCGIFBRDADDR: /* Get the broadcast address */ | |
797 | sin->sin_addr.s_addr = ifa->ifa_broadcast; | |
798 | goto rarok; | |
799 | ||
800 | case SIOCGIFDSTADDR: /* Get the destination address */ | |
801 | sin->sin_addr.s_addr = ifa->ifa_address; | |
802 | goto rarok; | |
803 | ||
804 | case SIOCGIFNETMASK: /* Get the netmask for the interface */ | |
805 | sin->sin_addr.s_addr = ifa->ifa_mask; | |
806 | goto rarok; | |
807 | ||
808 | case SIOCSIFFLAGS: | |
809 | if (colon) { | |
810 | ret = -EADDRNOTAVAIL; | |
811 | if (!ifa) | |
812 | break; | |
813 | ret = 0; | |
814 | if (!(ifr.ifr_flags & IFF_UP)) | |
815 | inet_del_ifa(in_dev, ifap, 1); | |
816 | break; | |
817 | } | |
818 | ret = dev_change_flags(dev, ifr.ifr_flags); | |
819 | break; | |
820 | ||
821 | case SIOCSIFADDR: /* Set interface address (and family) */ | |
822 | ret = -EINVAL; | |
823 | if (inet_abc_len(sin->sin_addr.s_addr) < 0) | |
824 | break; | |
825 | ||
826 | if (!ifa) { | |
827 | ret = -ENOBUFS; | |
9f9354b9 | 828 | ifa = inet_alloc_ifa(); |
fd23c3b3 | 829 | INIT_HLIST_NODE(&ifa->hash); |
9f9354b9 | 830 | if (!ifa) |
1da177e4 LT |
831 | break; |
832 | if (colon) | |
833 | memcpy(ifa->ifa_label, ifr.ifr_name, IFNAMSIZ); | |
834 | else | |
835 | memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); | |
836 | } else { | |
837 | ret = 0; | |
838 | if (ifa->ifa_local == sin->sin_addr.s_addr) | |
839 | break; | |
840 | inet_del_ifa(in_dev, ifap, 0); | |
841 | ifa->ifa_broadcast = 0; | |
148f9729 | 842 | ifa->ifa_scope = 0; |
1da177e4 LT |
843 | } |
844 | ||
845 | ifa->ifa_address = ifa->ifa_local = sin->sin_addr.s_addr; | |
846 | ||
847 | if (!(dev->flags & IFF_POINTOPOINT)) { | |
848 | ifa->ifa_prefixlen = inet_abc_len(ifa->ifa_address); | |
849 | ifa->ifa_mask = inet_make_mask(ifa->ifa_prefixlen); | |
850 | if ((dev->flags & IFF_BROADCAST) && | |
851 | ifa->ifa_prefixlen < 31) | |
852 | ifa->ifa_broadcast = ifa->ifa_address | | |
853 | ~ifa->ifa_mask; | |
854 | } else { | |
855 | ifa->ifa_prefixlen = 32; | |
856 | ifa->ifa_mask = inet_make_mask(32); | |
857 | } | |
858 | ret = inet_set_ifa(dev, ifa); | |
859 | break; | |
860 | ||
861 | case SIOCSIFBRDADDR: /* Set the broadcast address */ | |
862 | ret = 0; | |
863 | if (ifa->ifa_broadcast != sin->sin_addr.s_addr) { | |
864 | inet_del_ifa(in_dev, ifap, 0); | |
865 | ifa->ifa_broadcast = sin->sin_addr.s_addr; | |
866 | inet_insert_ifa(ifa); | |
867 | } | |
868 | break; | |
869 | ||
870 | case SIOCSIFDSTADDR: /* Set the destination address */ | |
871 | ret = 0; | |
872 | if (ifa->ifa_address == sin->sin_addr.s_addr) | |
873 | break; | |
874 | ret = -EINVAL; | |
875 | if (inet_abc_len(sin->sin_addr.s_addr) < 0) | |
876 | break; | |
877 | ret = 0; | |
878 | inet_del_ifa(in_dev, ifap, 0); | |
879 | ifa->ifa_address = sin->sin_addr.s_addr; | |
880 | inet_insert_ifa(ifa); | |
881 | break; | |
882 | ||
883 | case SIOCSIFNETMASK: /* Set the netmask for the interface */ | |
884 | ||
885 | /* | |
886 | * The mask we set must be legal. | |
887 | */ | |
888 | ret = -EINVAL; | |
889 | if (bad_mask(sin->sin_addr.s_addr, 0)) | |
890 | break; | |
891 | ret = 0; | |
892 | if (ifa->ifa_mask != sin->sin_addr.s_addr) { | |
a144ea4b | 893 | __be32 old_mask = ifa->ifa_mask; |
1da177e4 LT |
894 | inet_del_ifa(in_dev, ifap, 0); |
895 | ifa->ifa_mask = sin->sin_addr.s_addr; | |
896 | ifa->ifa_prefixlen = inet_mask_len(ifa->ifa_mask); | |
897 | ||
898 | /* See if current broadcast address matches | |
899 | * with current netmask, then recalculate | |
900 | * the broadcast address. Otherwise it's a | |
901 | * funny address, so don't touch it since | |
902 | * the user seems to know what (s)he's doing... | |
903 | */ | |
904 | if ((dev->flags & IFF_BROADCAST) && | |
905 | (ifa->ifa_prefixlen < 31) && | |
906 | (ifa->ifa_broadcast == | |
dcab5e1e | 907 | (ifa->ifa_local|~old_mask))) { |
1da177e4 LT |
908 | ifa->ifa_broadcast = (ifa->ifa_local | |
909 | ~sin->sin_addr.s_addr); | |
910 | } | |
911 | inet_insert_ifa(ifa); | |
912 | } | |
913 | break; | |
914 | } | |
915 | done: | |
916 | rtnl_unlock(); | |
917 | out: | |
918 | return ret; | |
919 | rarok: | |
920 | rtnl_unlock(); | |
921 | ret = copy_to_user(arg, &ifr, sizeof(struct ifreq)) ? -EFAULT : 0; | |
922 | goto out; | |
923 | } | |
924 | ||
925 | static int inet_gifconf(struct net_device *dev, char __user *buf, int len) | |
926 | { | |
e5ed6399 | 927 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
1da177e4 LT |
928 | struct in_ifaddr *ifa; |
929 | struct ifreq ifr; | |
930 | int done = 0; | |
931 | ||
9f9354b9 | 932 | if (!in_dev) |
1da177e4 LT |
933 | goto out; |
934 | ||
9f9354b9 | 935 | for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { |
1da177e4 LT |
936 | if (!buf) { |
937 | done += sizeof(ifr); | |
938 | continue; | |
939 | } | |
940 | if (len < (int) sizeof(ifr)) | |
941 | break; | |
942 | memset(&ifr, 0, sizeof(struct ifreq)); | |
943 | if (ifa->ifa_label) | |
944 | strcpy(ifr.ifr_name, ifa->ifa_label); | |
945 | else | |
946 | strcpy(ifr.ifr_name, dev->name); | |
947 | ||
948 | (*(struct sockaddr_in *)&ifr.ifr_addr).sin_family = AF_INET; | |
949 | (*(struct sockaddr_in *)&ifr.ifr_addr).sin_addr.s_addr = | |
950 | ifa->ifa_local; | |
951 | ||
952 | if (copy_to_user(buf, &ifr, sizeof(struct ifreq))) { | |
953 | done = -EFAULT; | |
954 | break; | |
955 | } | |
956 | buf += sizeof(struct ifreq); | |
957 | len -= sizeof(struct ifreq); | |
958 | done += sizeof(struct ifreq); | |
959 | } | |
960 | out: | |
961 | return done; | |
962 | } | |
963 | ||
a61ced5d | 964 | __be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope) |
1da177e4 | 965 | { |
a61ced5d | 966 | __be32 addr = 0; |
1da177e4 | 967 | struct in_device *in_dev; |
c346dca1 | 968 | struct net *net = dev_net(dev); |
1da177e4 LT |
969 | |
970 | rcu_read_lock(); | |
e5ed6399 | 971 | in_dev = __in_dev_get_rcu(dev); |
1da177e4 LT |
972 | if (!in_dev) |
973 | goto no_in_dev; | |
974 | ||
975 | for_primary_ifa(in_dev) { | |
976 | if (ifa->ifa_scope > scope) | |
977 | continue; | |
978 | if (!dst || inet_ifa_match(dst, ifa)) { | |
979 | addr = ifa->ifa_local; | |
980 | break; | |
981 | } | |
982 | if (!addr) | |
983 | addr = ifa->ifa_local; | |
984 | } endfor_ifa(in_dev); | |
1da177e4 LT |
985 | |
986 | if (addr) | |
c6d14c84 | 987 | goto out_unlock; |
9f9354b9 | 988 | no_in_dev: |
1da177e4 LT |
989 | |
990 | /* Not loopback addresses on loopback should be preferred | |
991 | in this case. It is importnat that lo is the first interface | |
992 | in dev_base list. | |
993 | */ | |
c6d14c84 | 994 | for_each_netdev_rcu(net, dev) { |
9f9354b9 ED |
995 | in_dev = __in_dev_get_rcu(dev); |
996 | if (!in_dev) | |
1da177e4 LT |
997 | continue; |
998 | ||
999 | for_primary_ifa(in_dev) { | |
1000 | if (ifa->ifa_scope != RT_SCOPE_LINK && | |
1001 | ifa->ifa_scope <= scope) { | |
1002 | addr = ifa->ifa_local; | |
c6d14c84 | 1003 | goto out_unlock; |
1da177e4 LT |
1004 | } |
1005 | } endfor_ifa(in_dev); | |
1006 | } | |
c6d14c84 | 1007 | out_unlock: |
1da177e4 | 1008 | rcu_read_unlock(); |
1da177e4 LT |
1009 | return addr; |
1010 | } | |
9f9354b9 | 1011 | EXPORT_SYMBOL(inet_select_addr); |
1da177e4 | 1012 | |
60cad5da AV |
1013 | static __be32 confirm_addr_indev(struct in_device *in_dev, __be32 dst, |
1014 | __be32 local, int scope) | |
1da177e4 LT |
1015 | { |
1016 | int same = 0; | |
a144ea4b | 1017 | __be32 addr = 0; |
1da177e4 LT |
1018 | |
1019 | for_ifa(in_dev) { | |
1020 | if (!addr && | |
1021 | (local == ifa->ifa_local || !local) && | |
1022 | ifa->ifa_scope <= scope) { | |
1023 | addr = ifa->ifa_local; | |
1024 | if (same) | |
1025 | break; | |
1026 | } | |
1027 | if (!same) { | |
1028 | same = (!local || inet_ifa_match(local, ifa)) && | |
1029 | (!dst || inet_ifa_match(dst, ifa)); | |
1030 | if (same && addr) { | |
1031 | if (local || !dst) | |
1032 | break; | |
1033 | /* Is the selected addr into dst subnet? */ | |
1034 | if (inet_ifa_match(addr, ifa)) | |
1035 | break; | |
1036 | /* No, then can we use new local src? */ | |
1037 | if (ifa->ifa_scope <= scope) { | |
1038 | addr = ifa->ifa_local; | |
1039 | break; | |
1040 | } | |
1041 | /* search for large dst subnet for addr */ | |
1042 | same = 0; | |
1043 | } | |
1044 | } | |
1045 | } endfor_ifa(in_dev); | |
1046 | ||
9f9354b9 | 1047 | return same ? addr : 0; |
1da177e4 LT |
1048 | } |
1049 | ||
1050 | /* | |
1051 | * Confirm that local IP address exists using wildcards: | |
9bd85e32 | 1052 | * - in_dev: only on this interface, 0=any interface |
1da177e4 LT |
1053 | * - dst: only in the same subnet as dst, 0=any dst |
1054 | * - local: address, 0=autoselect the local address | |
1055 | * - scope: maximum allowed scope value for the local address | |
1056 | */ | |
9bd85e32 DL |
1057 | __be32 inet_confirm_addr(struct in_device *in_dev, |
1058 | __be32 dst, __be32 local, int scope) | |
1da177e4 | 1059 | { |
60cad5da | 1060 | __be32 addr = 0; |
9bd85e32 | 1061 | struct net_device *dev; |
39a6d063 | 1062 | struct net *net; |
1da177e4 | 1063 | |
39a6d063 | 1064 | if (scope != RT_SCOPE_LINK) |
9bd85e32 | 1065 | return confirm_addr_indev(in_dev, dst, local, scope); |
1da177e4 | 1066 | |
c346dca1 | 1067 | net = dev_net(in_dev->dev); |
1da177e4 | 1068 | rcu_read_lock(); |
c6d14c84 | 1069 | for_each_netdev_rcu(net, dev) { |
9f9354b9 ED |
1070 | in_dev = __in_dev_get_rcu(dev); |
1071 | if (in_dev) { | |
1da177e4 LT |
1072 | addr = confirm_addr_indev(in_dev, dst, local, scope); |
1073 | if (addr) | |
1074 | break; | |
1075 | } | |
1076 | } | |
1077 | rcu_read_unlock(); | |
1da177e4 LT |
1078 | |
1079 | return addr; | |
1080 | } | |
eaddcd76 | 1081 | EXPORT_SYMBOL(inet_confirm_addr); |
1da177e4 LT |
1082 | |
1083 | /* | |
1084 | * Device notifier | |
1085 | */ | |
1086 | ||
1087 | int register_inetaddr_notifier(struct notifier_block *nb) | |
1088 | { | |
e041c683 | 1089 | return blocking_notifier_chain_register(&inetaddr_chain, nb); |
1da177e4 | 1090 | } |
9f9354b9 | 1091 | EXPORT_SYMBOL(register_inetaddr_notifier); |
1da177e4 LT |
1092 | |
1093 | int unregister_inetaddr_notifier(struct notifier_block *nb) | |
1094 | { | |
e041c683 | 1095 | return blocking_notifier_chain_unregister(&inetaddr_chain, nb); |
1da177e4 | 1096 | } |
9f9354b9 | 1097 | EXPORT_SYMBOL(unregister_inetaddr_notifier); |
1da177e4 | 1098 | |
9f9354b9 ED |
1099 | /* Rename ifa_labels for a device name change. Make some effort to preserve |
1100 | * existing alias numbering and to create unique labels if possible. | |
1da177e4 LT |
1101 | */ |
1102 | static void inetdev_changename(struct net_device *dev, struct in_device *in_dev) | |
e905a9ed | 1103 | { |
1da177e4 LT |
1104 | struct in_ifaddr *ifa; |
1105 | int named = 0; | |
1106 | ||
e905a9ed YH |
1107 | for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { |
1108 | char old[IFNAMSIZ], *dot; | |
1da177e4 LT |
1109 | |
1110 | memcpy(old, ifa->ifa_label, IFNAMSIZ); | |
e905a9ed | 1111 | memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); |
1da177e4 | 1112 | if (named++ == 0) |
573bf470 | 1113 | goto skip; |
44344b2a | 1114 | dot = strchr(old, ':'); |
e905a9ed YH |
1115 | if (dot == NULL) { |
1116 | sprintf(old, ":%d", named); | |
1da177e4 LT |
1117 | dot = old; |
1118 | } | |
9f9354b9 | 1119 | if (strlen(dot) + strlen(dev->name) < IFNAMSIZ) |
e905a9ed | 1120 | strcat(ifa->ifa_label, dot); |
9f9354b9 | 1121 | else |
e905a9ed | 1122 | strcpy(ifa->ifa_label + (IFNAMSIZ - strlen(dot) - 1), dot); |
573bf470 TG |
1123 | skip: |
1124 | rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0); | |
e905a9ed YH |
1125 | } |
1126 | } | |
1da177e4 | 1127 | |
06770843 BL |
1128 | static inline bool inetdev_valid_mtu(unsigned mtu) |
1129 | { | |
1130 | return mtu >= 68; | |
1131 | } | |
1132 | ||
d11327ad IC |
1133 | static void inetdev_send_gratuitous_arp(struct net_device *dev, |
1134 | struct in_device *in_dev) | |
1135 | ||
1136 | { | |
b76d0789 | 1137 | struct in_ifaddr *ifa; |
d11327ad | 1138 | |
b76d0789 ZK |
1139 | for (ifa = in_dev->ifa_list; ifa; |
1140 | ifa = ifa->ifa_next) { | |
1141 | arp_send(ARPOP_REQUEST, ETH_P_ARP, | |
1142 | ifa->ifa_local, dev, | |
1143 | ifa->ifa_local, NULL, | |
1144 | dev->dev_addr, NULL); | |
1145 | } | |
d11327ad IC |
1146 | } |
1147 | ||
1da177e4 LT |
1148 | /* Called only under RTNL semaphore */ |
1149 | ||
1150 | static int inetdev_event(struct notifier_block *this, unsigned long event, | |
1151 | void *ptr) | |
1152 | { | |
1153 | struct net_device *dev = ptr; | |
e5ed6399 | 1154 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
1da177e4 LT |
1155 | |
1156 | ASSERT_RTNL(); | |
1157 | ||
1158 | if (!in_dev) { | |
8030f544 | 1159 | if (event == NETDEV_REGISTER) { |
1da177e4 | 1160 | in_dev = inetdev_init(dev); |
b217d616 HX |
1161 | if (!in_dev) |
1162 | return notifier_from_errno(-ENOMEM); | |
0cc217e1 | 1163 | if (dev->flags & IFF_LOOPBACK) { |
42f811b8 HX |
1164 | IN_DEV_CONF_SET(in_dev, NOXFRM, 1); |
1165 | IN_DEV_CONF_SET(in_dev, NOPOLICY, 1); | |
8030f544 | 1166 | } |
06770843 BL |
1167 | } else if (event == NETDEV_CHANGEMTU) { |
1168 | /* Re-enabling IP */ | |
1169 | if (inetdev_valid_mtu(dev->mtu)) | |
1170 | in_dev = inetdev_init(dev); | |
1da177e4 LT |
1171 | } |
1172 | goto out; | |
1173 | } | |
1174 | ||
1175 | switch (event) { | |
1176 | case NETDEV_REGISTER: | |
1177 | printk(KERN_DEBUG "inetdev_event: bug\n"); | |
a9b3cd7f | 1178 | RCU_INIT_POINTER(dev->ip_ptr, NULL); |
1da177e4 LT |
1179 | break; |
1180 | case NETDEV_UP: | |
06770843 | 1181 | if (!inetdev_valid_mtu(dev->mtu)) |
1da177e4 | 1182 | break; |
0cc217e1 | 1183 | if (dev->flags & IFF_LOOPBACK) { |
9f9354b9 ED |
1184 | struct in_ifaddr *ifa = inet_alloc_ifa(); |
1185 | ||
1186 | if (ifa) { | |
fd23c3b3 | 1187 | INIT_HLIST_NODE(&ifa->hash); |
1da177e4 LT |
1188 | ifa->ifa_local = |
1189 | ifa->ifa_address = htonl(INADDR_LOOPBACK); | |
1190 | ifa->ifa_prefixlen = 8; | |
1191 | ifa->ifa_mask = inet_make_mask(8); | |
1192 | in_dev_hold(in_dev); | |
1193 | ifa->ifa_dev = in_dev; | |
1194 | ifa->ifa_scope = RT_SCOPE_HOST; | |
1195 | memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); | |
1196 | inet_insert_ifa(ifa); | |
1197 | } | |
1198 | } | |
1199 | ip_mc_up(in_dev); | |
eefef1cf SH |
1200 | /* fall through */ |
1201 | case NETDEV_CHANGEADDR: | |
d11327ad IC |
1202 | if (!IN_DEV_ARP_NOTIFY(in_dev)) |
1203 | break; | |
1204 | /* fall through */ | |
1205 | case NETDEV_NOTIFY_PEERS: | |
a21090cf | 1206 | /* Send gratuitous ARP to notify of link change */ |
d11327ad | 1207 | inetdev_send_gratuitous_arp(dev, in_dev); |
1da177e4 LT |
1208 | break; |
1209 | case NETDEV_DOWN: | |
1210 | ip_mc_down(in_dev); | |
1211 | break; | |
93d9b7d7 | 1212 | case NETDEV_PRE_TYPE_CHANGE: |
75c78500 MS |
1213 | ip_mc_unmap(in_dev); |
1214 | break; | |
93d9b7d7 | 1215 | case NETDEV_POST_TYPE_CHANGE: |
75c78500 MS |
1216 | ip_mc_remap(in_dev); |
1217 | break; | |
1da177e4 | 1218 | case NETDEV_CHANGEMTU: |
06770843 | 1219 | if (inetdev_valid_mtu(dev->mtu)) |
1da177e4 | 1220 | break; |
06770843 | 1221 | /* disable IP when MTU is not enough */ |
1da177e4 LT |
1222 | case NETDEV_UNREGISTER: |
1223 | inetdev_destroy(in_dev); | |
1224 | break; | |
1225 | case NETDEV_CHANGENAME: | |
1226 | /* Do not notify about label change, this event is | |
1227 | * not interesting to applications using netlink. | |
1228 | */ | |
1229 | inetdev_changename(dev, in_dev); | |
1230 | ||
51602b2a | 1231 | devinet_sysctl_unregister(in_dev); |
66f27a52 | 1232 | devinet_sysctl_register(in_dev); |
1da177e4 LT |
1233 | break; |
1234 | } | |
1235 | out: | |
1236 | return NOTIFY_DONE; | |
1237 | } | |
1238 | ||
1239 | static struct notifier_block ip_netdev_notifier = { | |
539afedf | 1240 | .notifier_call = inetdev_event, |
1da177e4 LT |
1241 | }; |
1242 | ||
339bf98f TG |
1243 | static inline size_t inet_nlmsg_size(void) |
1244 | { | |
1245 | return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) | |
1246 | + nla_total_size(4) /* IFA_ADDRESS */ | |
1247 | + nla_total_size(4) /* IFA_LOCAL */ | |
1248 | + nla_total_size(4) /* IFA_BROADCAST */ | |
339bf98f TG |
1249 | + nla_total_size(IFNAMSIZ); /* IFA_LABEL */ |
1250 | } | |
1251 | ||
1da177e4 | 1252 | static int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa, |
b6544c0b | 1253 | u32 pid, u32 seq, int event, unsigned int flags) |
1da177e4 LT |
1254 | { |
1255 | struct ifaddrmsg *ifm; | |
1256 | struct nlmsghdr *nlh; | |
1da177e4 | 1257 | |
47f68512 TG |
1258 | nlh = nlmsg_put(skb, pid, seq, event, sizeof(*ifm), flags); |
1259 | if (nlh == NULL) | |
26932566 | 1260 | return -EMSGSIZE; |
47f68512 TG |
1261 | |
1262 | ifm = nlmsg_data(nlh); | |
1da177e4 LT |
1263 | ifm->ifa_family = AF_INET; |
1264 | ifm->ifa_prefixlen = ifa->ifa_prefixlen; | |
1265 | ifm->ifa_flags = ifa->ifa_flags|IFA_F_PERMANENT; | |
1266 | ifm->ifa_scope = ifa->ifa_scope; | |
1267 | ifm->ifa_index = ifa->ifa_dev->dev->ifindex; | |
47f68512 | 1268 | |
1da177e4 | 1269 | if (ifa->ifa_address) |
a7a628c4 | 1270 | NLA_PUT_BE32(skb, IFA_ADDRESS, ifa->ifa_address); |
47f68512 | 1271 | |
1da177e4 | 1272 | if (ifa->ifa_local) |
a7a628c4 | 1273 | NLA_PUT_BE32(skb, IFA_LOCAL, ifa->ifa_local); |
47f68512 | 1274 | |
1da177e4 | 1275 | if (ifa->ifa_broadcast) |
a7a628c4 | 1276 | NLA_PUT_BE32(skb, IFA_BROADCAST, ifa->ifa_broadcast); |
47f68512 | 1277 | |
1da177e4 | 1278 | if (ifa->ifa_label[0]) |
47f68512 | 1279 | NLA_PUT_STRING(skb, IFA_LABEL, ifa->ifa_label); |
1da177e4 | 1280 | |
47f68512 TG |
1281 | return nlmsg_end(skb, nlh); |
1282 | ||
1283 | nla_put_failure: | |
26932566 PM |
1284 | nlmsg_cancel(skb, nlh); |
1285 | return -EMSGSIZE; | |
1da177e4 LT |
1286 | } |
1287 | ||
1288 | static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) | |
1289 | { | |
3b1e0a65 | 1290 | struct net *net = sock_net(skb->sk); |
eec4df98 ED |
1291 | int h, s_h; |
1292 | int idx, s_idx; | |
1293 | int ip_idx, s_ip_idx; | |
1da177e4 LT |
1294 | struct net_device *dev; |
1295 | struct in_device *in_dev; | |
1296 | struct in_ifaddr *ifa; | |
eec4df98 ED |
1297 | struct hlist_head *head; |
1298 | struct hlist_node *node; | |
1da177e4 | 1299 | |
eec4df98 ED |
1300 | s_h = cb->args[0]; |
1301 | s_idx = idx = cb->args[1]; | |
1302 | s_ip_idx = ip_idx = cb->args[2]; | |
1303 | ||
1304 | for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { | |
1305 | idx = 0; | |
1306 | head = &net->dev_index_head[h]; | |
1307 | rcu_read_lock(); | |
1308 | hlist_for_each_entry_rcu(dev, node, head, index_hlist) { | |
1309 | if (idx < s_idx) | |
1310 | goto cont; | |
4b97efdf | 1311 | if (h > s_h || idx > s_idx) |
eec4df98 ED |
1312 | s_ip_idx = 0; |
1313 | in_dev = __in_dev_get_rcu(dev); | |
1314 | if (!in_dev) | |
1315 | goto cont; | |
1da177e4 | 1316 | |
eec4df98 ED |
1317 | for (ifa = in_dev->ifa_list, ip_idx = 0; ifa; |
1318 | ifa = ifa->ifa_next, ip_idx++) { | |
1319 | if (ip_idx < s_ip_idx) | |
1320 | continue; | |
1321 | if (inet_fill_ifaddr(skb, ifa, | |
1322 | NETLINK_CB(cb->skb).pid, | |
1da177e4 | 1323 | cb->nlh->nlmsg_seq, |
eec4df98 ED |
1324 | RTM_NEWADDR, NLM_F_MULTI) <= 0) { |
1325 | rcu_read_unlock(); | |
1326 | goto done; | |
1327 | } | |
1328 | } | |
7562f876 | 1329 | cont: |
eec4df98 ED |
1330 | idx++; |
1331 | } | |
1332 | rcu_read_unlock(); | |
1da177e4 LT |
1333 | } |
1334 | ||
1335 | done: | |
eec4df98 ED |
1336 | cb->args[0] = h; |
1337 | cb->args[1] = idx; | |
1338 | cb->args[2] = ip_idx; | |
1da177e4 LT |
1339 | |
1340 | return skb->len; | |
1341 | } | |
1342 | ||
539afedf | 1343 | static void rtmsg_ifa(int event, struct in_ifaddr *ifa, struct nlmsghdr *nlh, |
d6062cbb | 1344 | u32 pid) |
1da177e4 | 1345 | { |
47f68512 | 1346 | struct sk_buff *skb; |
d6062cbb TG |
1347 | u32 seq = nlh ? nlh->nlmsg_seq : 0; |
1348 | int err = -ENOBUFS; | |
4b8aa9ab | 1349 | struct net *net; |
1da177e4 | 1350 | |
c346dca1 | 1351 | net = dev_net(ifa->ifa_dev->dev); |
339bf98f | 1352 | skb = nlmsg_new(inet_nlmsg_size(), GFP_KERNEL); |
47f68512 | 1353 | if (skb == NULL) |
d6062cbb TG |
1354 | goto errout; |
1355 | ||
1356 | err = inet_fill_ifaddr(skb, ifa, pid, seq, event, 0); | |
26932566 PM |
1357 | if (err < 0) { |
1358 | /* -EMSGSIZE implies BUG in inet_nlmsg_size() */ | |
1359 | WARN_ON(err == -EMSGSIZE); | |
1360 | kfree_skb(skb); | |
1361 | goto errout; | |
1362 | } | |
1ce85fe4 PNA |
1363 | rtnl_notify(skb, net, pid, RTNLGRP_IPV4_IFADDR, nlh, GFP_KERNEL); |
1364 | return; | |
d6062cbb TG |
1365 | errout: |
1366 | if (err < 0) | |
4b8aa9ab | 1367 | rtnl_set_sk_err(net, RTNLGRP_IPV4_IFADDR, err); |
1da177e4 LT |
1368 | } |
1369 | ||
9f0f7272 TG |
1370 | static size_t inet_get_link_af_size(const struct net_device *dev) |
1371 | { | |
1fc19aff | 1372 | struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr); |
9f0f7272 TG |
1373 | |
1374 | if (!in_dev) | |
1375 | return 0; | |
1376 | ||
1377 | return nla_total_size(IPV4_DEVCONF_MAX * 4); /* IFLA_INET_CONF */ | |
1378 | } | |
1379 | ||
1380 | static int inet_fill_link_af(struct sk_buff *skb, const struct net_device *dev) | |
1381 | { | |
1fc19aff | 1382 | struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr); |
9f0f7272 TG |
1383 | struct nlattr *nla; |
1384 | int i; | |
1385 | ||
1386 | if (!in_dev) | |
1387 | return -ENODATA; | |
1388 | ||
1389 | nla = nla_reserve(skb, IFLA_INET_CONF, IPV4_DEVCONF_MAX * 4); | |
1390 | if (nla == NULL) | |
1391 | return -EMSGSIZE; | |
1392 | ||
1393 | for (i = 0; i < IPV4_DEVCONF_MAX; i++) | |
1394 | ((u32 *) nla_data(nla))[i] = in_dev->cnf.data[i]; | |
1395 | ||
1396 | return 0; | |
1397 | } | |
1398 | ||
1399 | static const struct nla_policy inet_af_policy[IFLA_INET_MAX+1] = { | |
1400 | [IFLA_INET_CONF] = { .type = NLA_NESTED }, | |
1401 | }; | |
1402 | ||
cf7afbfe TG |
1403 | static int inet_validate_link_af(const struct net_device *dev, |
1404 | const struct nlattr *nla) | |
9f0f7272 | 1405 | { |
9f0f7272 TG |
1406 | struct nlattr *a, *tb[IFLA_INET_MAX+1]; |
1407 | int err, rem; | |
1408 | ||
f7fce74e | 1409 | if (dev && !__in_dev_get_rtnl(dev)) |
cf7afbfe | 1410 | return -EAFNOSUPPORT; |
9f0f7272 TG |
1411 | |
1412 | err = nla_parse_nested(tb, IFLA_INET_MAX, nla, inet_af_policy); | |
1413 | if (err < 0) | |
1414 | return err; | |
1415 | ||
1416 | if (tb[IFLA_INET_CONF]) { | |
1417 | nla_for_each_nested(a, tb[IFLA_INET_CONF], rem) { | |
1418 | int cfgid = nla_type(a); | |
1419 | ||
1420 | if (nla_len(a) < 4) | |
1421 | return -EINVAL; | |
1422 | ||
1423 | if (cfgid <= 0 || cfgid > IPV4_DEVCONF_MAX) | |
1424 | return -EINVAL; | |
1425 | } | |
1426 | } | |
1427 | ||
cf7afbfe TG |
1428 | return 0; |
1429 | } | |
1430 | ||
1431 | static int inet_set_link_af(struct net_device *dev, const struct nlattr *nla) | |
1432 | { | |
f7fce74e | 1433 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
cf7afbfe TG |
1434 | struct nlattr *a, *tb[IFLA_INET_MAX+1]; |
1435 | int rem; | |
1436 | ||
1437 | if (!in_dev) | |
1438 | return -EAFNOSUPPORT; | |
1439 | ||
1440 | if (nla_parse_nested(tb, IFLA_INET_MAX, nla, NULL) < 0) | |
1441 | BUG(); | |
1442 | ||
9f0f7272 TG |
1443 | if (tb[IFLA_INET_CONF]) { |
1444 | nla_for_each_nested(a, tb[IFLA_INET_CONF], rem) | |
1445 | ipv4_devconf_set(in_dev, nla_type(a), nla_get_u32(a)); | |
1446 | } | |
1447 | ||
1448 | return 0; | |
1449 | } | |
1450 | ||
1da177e4 LT |
1451 | #ifdef CONFIG_SYSCTL |
1452 | ||
c0ce9fb3 | 1453 | static void devinet_copy_dflt_conf(struct net *net, int i) |
31be3085 HX |
1454 | { |
1455 | struct net_device *dev; | |
1456 | ||
c6d14c84 ED |
1457 | rcu_read_lock(); |
1458 | for_each_netdev_rcu(net, dev) { | |
31be3085 | 1459 | struct in_device *in_dev; |
c6d14c84 | 1460 | |
31be3085 HX |
1461 | in_dev = __in_dev_get_rcu(dev); |
1462 | if (in_dev && !test_bit(i, in_dev->cnf.state)) | |
9355bbd6 | 1463 | in_dev->cnf.data[i] = net->ipv4.devconf_dflt->data[i]; |
31be3085 | 1464 | } |
c6d14c84 | 1465 | rcu_read_unlock(); |
31be3085 HX |
1466 | } |
1467 | ||
c6d14c84 | 1468 | /* called with RTNL locked */ |
c0ce9fb3 | 1469 | static void inet_forward_change(struct net *net) |
68dd299b PE |
1470 | { |
1471 | struct net_device *dev; | |
586f1211 | 1472 | int on = IPV4_DEVCONF_ALL(net, FORWARDING); |
68dd299b | 1473 | |
586f1211 | 1474 | IPV4_DEVCONF_ALL(net, ACCEPT_REDIRECTS) = !on; |
9355bbd6 | 1475 | IPV4_DEVCONF_DFLT(net, FORWARDING) = on; |
68dd299b | 1476 | |
c0ce9fb3 | 1477 | for_each_netdev(net, dev) { |
68dd299b | 1478 | struct in_device *in_dev; |
0187bdfb BH |
1479 | if (on) |
1480 | dev_disable_lro(dev); | |
68dd299b PE |
1481 | rcu_read_lock(); |
1482 | in_dev = __in_dev_get_rcu(dev); | |
1483 | if (in_dev) | |
1484 | IN_DEV_CONF_SET(in_dev, FORWARDING, on); | |
1485 | rcu_read_unlock(); | |
1486 | } | |
68dd299b PE |
1487 | } |
1488 | ||
31be3085 | 1489 | static int devinet_conf_proc(ctl_table *ctl, int write, |
8d65af78 | 1490 | void __user *buffer, |
31be3085 HX |
1491 | size_t *lenp, loff_t *ppos) |
1492 | { | |
d01ff0a0 | 1493 | int old_value = *(int *)ctl->data; |
8d65af78 | 1494 | int ret = proc_dointvec(ctl, write, buffer, lenp, ppos); |
d01ff0a0 | 1495 | int new_value = *(int *)ctl->data; |
31be3085 HX |
1496 | |
1497 | if (write) { | |
1498 | struct ipv4_devconf *cnf = ctl->extra1; | |
c0ce9fb3 | 1499 | struct net *net = ctl->extra2; |
31be3085 HX |
1500 | int i = (int *)ctl->data - cnf->data; |
1501 | ||
1502 | set_bit(i, cnf->state); | |
1503 | ||
9355bbd6 | 1504 | if (cnf == net->ipv4.devconf_dflt) |
c0ce9fb3 | 1505 | devinet_copy_dflt_conf(net, i); |
d01ff0a0 PP |
1506 | if (i == IPV4_DEVCONF_ACCEPT_LOCAL - 1) |
1507 | if ((new_value == 0) && (old_value != 0)) | |
1508 | rt_cache_flush(net, 0); | |
31be3085 HX |
1509 | } |
1510 | ||
1511 | return ret; | |
1512 | } | |
1513 | ||
1da177e4 | 1514 | static int devinet_sysctl_forward(ctl_table *ctl, int write, |
8d65af78 | 1515 | void __user *buffer, |
1da177e4 LT |
1516 | size_t *lenp, loff_t *ppos) |
1517 | { | |
1518 | int *valp = ctl->data; | |
1519 | int val = *valp; | |
88af182e | 1520 | loff_t pos = *ppos; |
8d65af78 | 1521 | int ret = proc_dointvec(ctl, write, buffer, lenp, ppos); |
1da177e4 LT |
1522 | |
1523 | if (write && *valp != val) { | |
c0ce9fb3 PE |
1524 | struct net *net = ctl->extra2; |
1525 | ||
0187bdfb | 1526 | if (valp != &IPV4_DEVCONF_DFLT(net, FORWARDING)) { |
88af182e EB |
1527 | if (!rtnl_trylock()) { |
1528 | /* Restore the original values before restarting */ | |
1529 | *valp = val; | |
1530 | *ppos = pos; | |
9b8adb5e | 1531 | return restart_syscall(); |
88af182e | 1532 | } |
0187bdfb BH |
1533 | if (valp == &IPV4_DEVCONF_ALL(net, FORWARDING)) { |
1534 | inet_forward_change(net); | |
1535 | } else if (*valp) { | |
1536 | struct ipv4_devconf *cnf = ctl->extra1; | |
1537 | struct in_device *idev = | |
1538 | container_of(cnf, struct in_device, cnf); | |
1539 | dev_disable_lro(idev->dev); | |
1540 | } | |
1541 | rtnl_unlock(); | |
76e6ebfb | 1542 | rt_cache_flush(net, 0); |
0187bdfb | 1543 | } |
1da177e4 LT |
1544 | } |
1545 | ||
1546 | return ret; | |
1547 | } | |
1548 | ||
323e126f DM |
1549 | static int ipv4_doint_and_flush(ctl_table *ctl, int write, |
1550 | void __user *buffer, | |
1551 | size_t *lenp, loff_t *ppos) | |
1da177e4 LT |
1552 | { |
1553 | int *valp = ctl->data; | |
1554 | int val = *valp; | |
8d65af78 | 1555 | int ret = proc_dointvec(ctl, write, buffer, lenp, ppos); |
76e6ebfb | 1556 | struct net *net = ctl->extra2; |
1da177e4 LT |
1557 | |
1558 | if (write && *valp != val) | |
76e6ebfb | 1559 | rt_cache_flush(net, 0); |
1da177e4 LT |
1560 | |
1561 | return ret; | |
1562 | } | |
1563 | ||
f8572d8f | 1564 | #define DEVINET_SYSCTL_ENTRY(attr, name, mval, proc) \ |
42f811b8 | 1565 | { \ |
42f811b8 HX |
1566 | .procname = name, \ |
1567 | .data = ipv4_devconf.data + \ | |
02291680 | 1568 | IPV4_DEVCONF_ ## attr - 1, \ |
42f811b8 HX |
1569 | .maxlen = sizeof(int), \ |
1570 | .mode = mval, \ | |
1571 | .proc_handler = proc, \ | |
31be3085 | 1572 | .extra1 = &ipv4_devconf, \ |
42f811b8 HX |
1573 | } |
1574 | ||
1575 | #define DEVINET_SYSCTL_RW_ENTRY(attr, name) \ | |
f8572d8f | 1576 | DEVINET_SYSCTL_ENTRY(attr, name, 0644, devinet_conf_proc) |
42f811b8 HX |
1577 | |
1578 | #define DEVINET_SYSCTL_RO_ENTRY(attr, name) \ | |
f8572d8f | 1579 | DEVINET_SYSCTL_ENTRY(attr, name, 0444, devinet_conf_proc) |
42f811b8 | 1580 | |
f8572d8f EB |
1581 | #define DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, proc) \ |
1582 | DEVINET_SYSCTL_ENTRY(attr, name, 0644, proc) | |
42f811b8 HX |
1583 | |
1584 | #define DEVINET_SYSCTL_FLUSHING_ENTRY(attr, name) \ | |
f8572d8f | 1585 | DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, ipv4_doint_and_flush) |
42f811b8 | 1586 | |
1da177e4 LT |
1587 | static struct devinet_sysctl_table { |
1588 | struct ctl_table_header *sysctl_header; | |
02291680 | 1589 | struct ctl_table devinet_vars[__IPV4_DEVCONF_MAX]; |
bfada697 | 1590 | char *dev_name; |
1da177e4 LT |
1591 | } devinet_sysctl = { |
1592 | .devinet_vars = { | |
42f811b8 | 1593 | DEVINET_SYSCTL_COMPLEX_ENTRY(FORWARDING, "forwarding", |
f8572d8f | 1594 | devinet_sysctl_forward), |
42f811b8 HX |
1595 | DEVINET_SYSCTL_RO_ENTRY(MC_FORWARDING, "mc_forwarding"), |
1596 | ||
1597 | DEVINET_SYSCTL_RW_ENTRY(ACCEPT_REDIRECTS, "accept_redirects"), | |
1598 | DEVINET_SYSCTL_RW_ENTRY(SECURE_REDIRECTS, "secure_redirects"), | |
1599 | DEVINET_SYSCTL_RW_ENTRY(SHARED_MEDIA, "shared_media"), | |
1600 | DEVINET_SYSCTL_RW_ENTRY(RP_FILTER, "rp_filter"), | |
1601 | DEVINET_SYSCTL_RW_ENTRY(SEND_REDIRECTS, "send_redirects"), | |
1602 | DEVINET_SYSCTL_RW_ENTRY(ACCEPT_SOURCE_ROUTE, | |
1603 | "accept_source_route"), | |
8153a10c | 1604 | DEVINET_SYSCTL_RW_ENTRY(ACCEPT_LOCAL, "accept_local"), |
28f6aeea | 1605 | DEVINET_SYSCTL_RW_ENTRY(SRC_VMARK, "src_valid_mark"), |
42f811b8 HX |
1606 | DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP, "proxy_arp"), |
1607 | DEVINET_SYSCTL_RW_ENTRY(MEDIUM_ID, "medium_id"), | |
1608 | DEVINET_SYSCTL_RW_ENTRY(BOOTP_RELAY, "bootp_relay"), | |
1609 | DEVINET_SYSCTL_RW_ENTRY(LOG_MARTIANS, "log_martians"), | |
1610 | DEVINET_SYSCTL_RW_ENTRY(TAG, "tag"), | |
1611 | DEVINET_SYSCTL_RW_ENTRY(ARPFILTER, "arp_filter"), | |
1612 | DEVINET_SYSCTL_RW_ENTRY(ARP_ANNOUNCE, "arp_announce"), | |
1613 | DEVINET_SYSCTL_RW_ENTRY(ARP_IGNORE, "arp_ignore"), | |
1614 | DEVINET_SYSCTL_RW_ENTRY(ARP_ACCEPT, "arp_accept"), | |
eefef1cf | 1615 | DEVINET_SYSCTL_RW_ENTRY(ARP_NOTIFY, "arp_notify"), |
65324144 | 1616 | DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP_PVLAN, "proxy_arp_pvlan"), |
42f811b8 HX |
1617 | |
1618 | DEVINET_SYSCTL_FLUSHING_ENTRY(NOXFRM, "disable_xfrm"), | |
1619 | DEVINET_SYSCTL_FLUSHING_ENTRY(NOPOLICY, "disable_policy"), | |
1620 | DEVINET_SYSCTL_FLUSHING_ENTRY(FORCE_IGMP_VERSION, | |
1621 | "force_igmp_version"), | |
1622 | DEVINET_SYSCTL_FLUSHING_ENTRY(PROMOTE_SECONDARIES, | |
1623 | "promote_secondaries"), | |
1da177e4 | 1624 | }, |
1da177e4 LT |
1625 | }; |
1626 | ||
ea40b324 | 1627 | static int __devinet_sysctl_register(struct net *net, char *dev_name, |
f8572d8f | 1628 | struct ipv4_devconf *p) |
1da177e4 LT |
1629 | { |
1630 | int i; | |
9fa89642 | 1631 | struct devinet_sysctl_table *t; |
1da177e4 | 1632 | |
bfada697 PE |
1633 | #define DEVINET_CTL_PATH_DEV 3 |
1634 | ||
1635 | struct ctl_path devinet_ctl_path[] = { | |
f8572d8f EB |
1636 | { .procname = "net", }, |
1637 | { .procname = "ipv4", }, | |
1638 | { .procname = "conf", }, | |
bfada697 PE |
1639 | { /* to be set */ }, |
1640 | { }, | |
1641 | }; | |
1642 | ||
9fa89642 | 1643 | t = kmemdup(&devinet_sysctl, sizeof(*t), GFP_KERNEL); |
1da177e4 | 1644 | if (!t) |
9fa89642 PE |
1645 | goto out; |
1646 | ||
1da177e4 LT |
1647 | for (i = 0; i < ARRAY_SIZE(t->devinet_vars) - 1; i++) { |
1648 | t->devinet_vars[i].data += (char *)p - (char *)&ipv4_devconf; | |
31be3085 | 1649 | t->devinet_vars[i].extra1 = p; |
c0ce9fb3 | 1650 | t->devinet_vars[i].extra2 = net; |
1da177e4 LT |
1651 | } |
1652 | ||
e905a9ed YH |
1653 | /* |
1654 | * Make a copy of dev_name, because '.procname' is regarded as const | |
1da177e4 LT |
1655 | * by sysctl and we wouldn't want anyone to change it under our feet |
1656 | * (see SIOCSIFNAME). | |
e905a9ed | 1657 | */ |
bfada697 PE |
1658 | t->dev_name = kstrdup(dev_name, GFP_KERNEL); |
1659 | if (!t->dev_name) | |
9fa89642 | 1660 | goto free; |
1da177e4 | 1661 | |
bfada697 | 1662 | devinet_ctl_path[DEVINET_CTL_PATH_DEV].procname = t->dev_name; |
1da177e4 | 1663 | |
752d14dc | 1664 | t->sysctl_header = register_net_sysctl_table(net, devinet_ctl_path, |
bfada697 | 1665 | t->devinet_vars); |
1da177e4 | 1666 | if (!t->sysctl_header) |
9fa89642 | 1667 | goto free_procname; |
1da177e4 LT |
1668 | |
1669 | p->sysctl = t; | |
ea40b324 | 1670 | return 0; |
1da177e4 | 1671 | |
9fa89642 | 1672 | free_procname: |
bfada697 | 1673 | kfree(t->dev_name); |
9fa89642 | 1674 | free: |
1da177e4 | 1675 | kfree(t); |
9fa89642 | 1676 | out: |
ea40b324 | 1677 | return -ENOBUFS; |
1da177e4 LT |
1678 | } |
1679 | ||
51602b2a PE |
1680 | static void __devinet_sysctl_unregister(struct ipv4_devconf *cnf) |
1681 | { | |
1682 | struct devinet_sysctl_table *t = cnf->sysctl; | |
1683 | ||
1684 | if (t == NULL) | |
1685 | return; | |
1686 | ||
1687 | cnf->sysctl = NULL; | |
ff538818 | 1688 | unregister_net_sysctl_table(t->sysctl_header); |
51602b2a PE |
1689 | kfree(t->dev_name); |
1690 | kfree(t); | |
1691 | } | |
1692 | ||
66f27a52 PE |
1693 | static void devinet_sysctl_register(struct in_device *idev) |
1694 | { | |
54716e3b | 1695 | neigh_sysctl_register(idev->dev, idev->arp_parms, "ipv4", NULL); |
c346dca1 | 1696 | __devinet_sysctl_register(dev_net(idev->dev), idev->dev->name, |
f8572d8f | 1697 | &idev->cnf); |
66f27a52 PE |
1698 | } |
1699 | ||
51602b2a | 1700 | static void devinet_sysctl_unregister(struct in_device *idev) |
1da177e4 | 1701 | { |
51602b2a PE |
1702 | __devinet_sysctl_unregister(&idev->cnf); |
1703 | neigh_sysctl_unregister(idev->arp_parms); | |
1da177e4 | 1704 | } |
1da177e4 | 1705 | |
68dd299b PE |
1706 | static struct ctl_table ctl_forward_entry[] = { |
1707 | { | |
68dd299b PE |
1708 | .procname = "ip_forward", |
1709 | .data = &ipv4_devconf.data[ | |
02291680 | 1710 | IPV4_DEVCONF_FORWARDING - 1], |
68dd299b PE |
1711 | .maxlen = sizeof(int), |
1712 | .mode = 0644, | |
1713 | .proc_handler = devinet_sysctl_forward, | |
68dd299b | 1714 | .extra1 = &ipv4_devconf, |
c0ce9fb3 | 1715 | .extra2 = &init_net, |
68dd299b PE |
1716 | }, |
1717 | { }, | |
1718 | }; | |
1719 | ||
752d14dc | 1720 | static __net_initdata struct ctl_path net_ipv4_path[] = { |
f8572d8f EB |
1721 | { .procname = "net", }, |
1722 | { .procname = "ipv4", }, | |
68dd299b PE |
1723 | { }, |
1724 | }; | |
2a75de0c | 1725 | #endif |
68dd299b | 1726 | |
752d14dc PE |
1727 | static __net_init int devinet_init_net(struct net *net) |
1728 | { | |
1729 | int err; | |
752d14dc | 1730 | struct ipv4_devconf *all, *dflt; |
2a75de0c ED |
1731 | #ifdef CONFIG_SYSCTL |
1732 | struct ctl_table *tbl = ctl_forward_entry; | |
752d14dc | 1733 | struct ctl_table_header *forw_hdr; |
2a75de0c | 1734 | #endif |
752d14dc PE |
1735 | |
1736 | err = -ENOMEM; | |
1737 | all = &ipv4_devconf; | |
1738 | dflt = &ipv4_devconf_dflt; | |
752d14dc | 1739 | |
09ad9bc7 | 1740 | if (!net_eq(net, &init_net)) { |
752d14dc PE |
1741 | all = kmemdup(all, sizeof(ipv4_devconf), GFP_KERNEL); |
1742 | if (all == NULL) | |
1743 | goto err_alloc_all; | |
1744 | ||
1745 | dflt = kmemdup(dflt, sizeof(ipv4_devconf_dflt), GFP_KERNEL); | |
1746 | if (dflt == NULL) | |
1747 | goto err_alloc_dflt; | |
1748 | ||
2a75de0c | 1749 | #ifdef CONFIG_SYSCTL |
752d14dc PE |
1750 | tbl = kmemdup(tbl, sizeof(ctl_forward_entry), GFP_KERNEL); |
1751 | if (tbl == NULL) | |
1752 | goto err_alloc_ctl; | |
1753 | ||
02291680 | 1754 | tbl[0].data = &all->data[IPV4_DEVCONF_FORWARDING - 1]; |
752d14dc PE |
1755 | tbl[0].extra1 = all; |
1756 | tbl[0].extra2 = net; | |
2a75de0c | 1757 | #endif |
752d14dc PE |
1758 | } |
1759 | ||
1760 | #ifdef CONFIG_SYSCTL | |
f8572d8f | 1761 | err = __devinet_sysctl_register(net, "all", all); |
752d14dc PE |
1762 | if (err < 0) |
1763 | goto err_reg_all; | |
1764 | ||
f8572d8f | 1765 | err = __devinet_sysctl_register(net, "default", dflt); |
752d14dc PE |
1766 | if (err < 0) |
1767 | goto err_reg_dflt; | |
1768 | ||
1769 | err = -ENOMEM; | |
1770 | forw_hdr = register_net_sysctl_table(net, net_ipv4_path, tbl); | |
1771 | if (forw_hdr == NULL) | |
1772 | goto err_reg_ctl; | |
2a75de0c | 1773 | net->ipv4.forw_hdr = forw_hdr; |
752d14dc PE |
1774 | #endif |
1775 | ||
752d14dc PE |
1776 | net->ipv4.devconf_all = all; |
1777 | net->ipv4.devconf_dflt = dflt; | |
1778 | return 0; | |
1779 | ||
1780 | #ifdef CONFIG_SYSCTL | |
1781 | err_reg_ctl: | |
1782 | __devinet_sysctl_unregister(dflt); | |
1783 | err_reg_dflt: | |
1784 | __devinet_sysctl_unregister(all); | |
1785 | err_reg_all: | |
1786 | if (tbl != ctl_forward_entry) | |
1787 | kfree(tbl); | |
752d14dc | 1788 | err_alloc_ctl: |
2a75de0c | 1789 | #endif |
752d14dc PE |
1790 | if (dflt != &ipv4_devconf_dflt) |
1791 | kfree(dflt); | |
1792 | err_alloc_dflt: | |
1793 | if (all != &ipv4_devconf) | |
1794 | kfree(all); | |
1795 | err_alloc_all: | |
1796 | return err; | |
1797 | } | |
1798 | ||
1799 | static __net_exit void devinet_exit_net(struct net *net) | |
1800 | { | |
2a75de0c | 1801 | #ifdef CONFIG_SYSCTL |
752d14dc PE |
1802 | struct ctl_table *tbl; |
1803 | ||
1804 | tbl = net->ipv4.forw_hdr->ctl_table_arg; | |
752d14dc PE |
1805 | unregister_net_sysctl_table(net->ipv4.forw_hdr); |
1806 | __devinet_sysctl_unregister(net->ipv4.devconf_dflt); | |
1807 | __devinet_sysctl_unregister(net->ipv4.devconf_all); | |
752d14dc | 1808 | kfree(tbl); |
2a75de0c | 1809 | #endif |
752d14dc PE |
1810 | kfree(net->ipv4.devconf_dflt); |
1811 | kfree(net->ipv4.devconf_all); | |
1812 | } | |
1813 | ||
1814 | static __net_initdata struct pernet_operations devinet_ops = { | |
1815 | .init = devinet_init_net, | |
1816 | .exit = devinet_exit_net, | |
1817 | }; | |
1818 | ||
9f0f7272 TG |
1819 | static struct rtnl_af_ops inet_af_ops = { |
1820 | .family = AF_INET, | |
1821 | .fill_link_af = inet_fill_link_af, | |
1822 | .get_link_af_size = inet_get_link_af_size, | |
cf7afbfe TG |
1823 | .validate_link_af = inet_validate_link_af, |
1824 | .set_link_af = inet_set_link_af, | |
9f0f7272 TG |
1825 | }; |
1826 | ||
1da177e4 LT |
1827 | void __init devinet_init(void) |
1828 | { | |
fd23c3b3 DM |
1829 | int i; |
1830 | ||
1831 | for (i = 0; i < IN4_ADDR_HSIZE; i++) | |
1832 | INIT_HLIST_HEAD(&inet_addr_lst[i]); | |
1833 | ||
752d14dc PE |
1834 | register_pernet_subsys(&devinet_ops); |
1835 | ||
1da177e4 LT |
1836 | register_gifconf(PF_INET, inet_gifconf); |
1837 | register_netdevice_notifier(&ip_netdev_notifier); | |
63f3444f | 1838 | |
9f0f7272 TG |
1839 | rtnl_af_register(&inet_af_ops); |
1840 | ||
c7ac8679 GR |
1841 | rtnl_register(PF_INET, RTM_NEWADDR, inet_rtm_newaddr, NULL, NULL); |
1842 | rtnl_register(PF_INET, RTM_DELADDR, inet_rtm_deladdr, NULL, NULL); | |
1843 | rtnl_register(PF_INET, RTM_GETADDR, NULL, inet_dump_ifaddr, NULL); | |
1da177e4 LT |
1844 | } |
1845 |