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> | |
30 | #include <asm/system.h> | |
31 | #include <linux/bitops.h> | |
4fc268d2 | 32 | #include <linux/capability.h> |
1da177e4 LT |
33 | #include <linux/module.h> |
34 | #include <linux/types.h> | |
35 | #include <linux/kernel.h> | |
1da177e4 LT |
36 | #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> | |
1823730f | 43 | #include <linux/if_addr.h> |
1da177e4 LT |
44 | #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> | |
1da177e4 LT |
49 | #include <linux/init.h> |
50 | #include <linux/notifier.h> | |
51 | #include <linux/inetdevice.h> | |
52 | #include <linux/igmp.h> | |
5a0e3ad6 | 53 | #include <linux/slab.h> |
fd23c3b3 | 54 | #include <linux/hash.h> |
1da177e4 LT |
55 | #ifdef CONFIG_SYSCTL |
56 | #include <linux/sysctl.h> | |
57 | #endif | |
58 | #include <linux/kmod.h> | |
59 | ||
14c85021 | 60 | #include <net/arp.h> |
1da177e4 LT |
61 | #include <net/ip.h> |
62 | #include <net/route.h> | |
63 | #include <net/ip_fib.h> | |
63f3444f | 64 | #include <net/rtnetlink.h> |
752d14dc | 65 | #include <net/net_namespace.h> |
1da177e4 | 66 | |
0027ba84 | 67 | static struct ipv4_devconf ipv4_devconf = { |
42f811b8 | 68 | .data = { |
02291680 EB |
69 | [IPV4_DEVCONF_ACCEPT_REDIRECTS - 1] = 1, |
70 | [IPV4_DEVCONF_SEND_REDIRECTS - 1] = 1, | |
71 | [IPV4_DEVCONF_SECURE_REDIRECTS - 1] = 1, | |
72 | [IPV4_DEVCONF_SHARED_MEDIA - 1] = 1, | |
42f811b8 | 73 | }, |
1da177e4 LT |
74 | }; |
75 | ||
76 | static struct ipv4_devconf ipv4_devconf_dflt = { | |
42f811b8 | 77 | .data = { |
02291680 EB |
78 | [IPV4_DEVCONF_ACCEPT_REDIRECTS - 1] = 1, |
79 | [IPV4_DEVCONF_SEND_REDIRECTS - 1] = 1, | |
80 | [IPV4_DEVCONF_SECURE_REDIRECTS - 1] = 1, | |
81 | [IPV4_DEVCONF_SHARED_MEDIA - 1] = 1, | |
82 | [IPV4_DEVCONF_ACCEPT_SOURCE_ROUTE - 1] = 1, | |
42f811b8 | 83 | }, |
1da177e4 LT |
84 | }; |
85 | ||
9355bbd6 PE |
86 | #define IPV4_DEVCONF_DFLT(net, attr) \ |
87 | IPV4_DEVCONF((*net->ipv4.devconf_dflt), attr) | |
42f811b8 | 88 | |
ef7c79ed | 89 | static const struct nla_policy ifa_ipv4_policy[IFA_MAX+1] = { |
5c753978 TG |
90 | [IFA_LOCAL] = { .type = NLA_U32 }, |
91 | [IFA_ADDRESS] = { .type = NLA_U32 }, | |
92 | [IFA_BROADCAST] = { .type = NLA_U32 }, | |
5176f91e | 93 | [IFA_LABEL] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, |
5c753978 TG |
94 | }; |
95 | ||
fd23c3b3 DM |
96 | /* inet_addr_hash's shifting is dependent upon this IN4_ADDR_HSIZE |
97 | * value. So if you change this define, make appropriate changes to | |
98 | * inet_addr_hash as well. | |
99 | */ | |
100 | #define IN4_ADDR_HSIZE 256 | |
101 | static struct hlist_head inet_addr_lst[IN4_ADDR_HSIZE]; | |
102 | static DEFINE_SPINLOCK(inet_addr_hash_lock); | |
103 | ||
104 | static inline unsigned int inet_addr_hash(struct net *net, __be32 addr) | |
105 | { | |
106 | u32 val = (__force u32) addr ^ hash_ptr(net, 8); | |
107 | ||
108 | return ((val ^ (val >> 8) ^ (val >> 16) ^ (val >> 24)) & | |
109 | (IN4_ADDR_HSIZE - 1)); | |
110 | } | |
111 | ||
112 | static void inet_hash_insert(struct net *net, struct in_ifaddr *ifa) | |
113 | { | |
114 | unsigned int hash = inet_addr_hash(net, ifa->ifa_address); | |
115 | ||
116 | spin_lock(&inet_addr_hash_lock); | |
117 | hlist_add_head_rcu(&ifa->hash, &inet_addr_lst[hash]); | |
118 | spin_unlock(&inet_addr_hash_lock); | |
119 | } | |
120 | ||
121 | static void inet_hash_remove(struct in_ifaddr *ifa) | |
122 | { | |
123 | spin_lock(&inet_addr_hash_lock); | |
124 | hlist_del_init_rcu(&ifa->hash); | |
125 | spin_unlock(&inet_addr_hash_lock); | |
126 | } | |
127 | ||
9435eb1c DM |
128 | /** |
129 | * __ip_dev_find - find the first device with a given source address. | |
130 | * @net: the net namespace | |
131 | * @addr: the source address | |
132 | * @devref: if true, take a reference on the found device | |
133 | * | |
134 | * If a caller uses devref=false, it should be protected by RCU, or RTNL | |
135 | */ | |
136 | struct net_device *__ip_dev_find(struct net *net, __be32 addr, bool devref) | |
137 | { | |
138 | unsigned int hash = inet_addr_hash(net, addr); | |
139 | struct net_device *result = NULL; | |
140 | struct in_ifaddr *ifa; | |
141 | struct hlist_node *node; | |
142 | ||
143 | rcu_read_lock(); | |
144 | hlist_for_each_entry_rcu(ifa, node, &inet_addr_lst[hash], hash) { | |
145 | struct net_device *dev = ifa->ifa_dev->dev; | |
146 | ||
147 | if (!net_eq(dev_net(dev), net)) | |
148 | continue; | |
149 | if (ifa->ifa_address == addr) { | |
150 | result = dev; | |
151 | break; | |
152 | } | |
153 | } | |
154 | if (result && devref) | |
155 | dev_hold(result); | |
156 | rcu_read_unlock(); | |
157 | return result; | |
158 | } | |
159 | EXPORT_SYMBOL(__ip_dev_find); | |
160 | ||
d6062cbb | 161 | static void rtmsg_ifa(int event, struct in_ifaddr *, struct nlmsghdr *, u32); |
1da177e4 | 162 | |
e041c683 | 163 | static BLOCKING_NOTIFIER_HEAD(inetaddr_chain); |
1da177e4 LT |
164 | static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap, |
165 | int destroy); | |
166 | #ifdef CONFIG_SYSCTL | |
66f27a52 | 167 | static void devinet_sysctl_register(struct in_device *idev); |
51602b2a PE |
168 | static void devinet_sysctl_unregister(struct in_device *idev); |
169 | #else | |
170 | static inline void devinet_sysctl_register(struct in_device *idev) | |
171 | { | |
172 | } | |
173 | static inline void devinet_sysctl_unregister(struct in_device *idev) | |
174 | { | |
175 | } | |
1da177e4 LT |
176 | #endif |
177 | ||
178 | /* Locks all the inet devices. */ | |
179 | ||
180 | static struct in_ifaddr *inet_alloc_ifa(void) | |
181 | { | |
93adcc80 | 182 | return kzalloc(sizeof(struct in_ifaddr), GFP_KERNEL); |
1da177e4 LT |
183 | } |
184 | ||
185 | static void inet_rcu_free_ifa(struct rcu_head *head) | |
186 | { | |
187 | struct in_ifaddr *ifa = container_of(head, struct in_ifaddr, rcu_head); | |
188 | if (ifa->ifa_dev) | |
189 | in_dev_put(ifa->ifa_dev); | |
190 | kfree(ifa); | |
191 | } | |
192 | ||
193 | static inline void inet_free_ifa(struct in_ifaddr *ifa) | |
194 | { | |
195 | call_rcu(&ifa->rcu_head, inet_rcu_free_ifa); | |
196 | } | |
197 | ||
198 | void in_dev_finish_destroy(struct in_device *idev) | |
199 | { | |
200 | struct net_device *dev = idev->dev; | |
201 | ||
547b792c IJ |
202 | WARN_ON(idev->ifa_list); |
203 | WARN_ON(idev->mc_list); | |
1da177e4 LT |
204 | #ifdef NET_REFCNT_DEBUG |
205 | printk(KERN_DEBUG "in_dev_finish_destroy: %p=%s\n", | |
206 | idev, dev ? dev->name : "NIL"); | |
207 | #endif | |
208 | dev_put(dev); | |
209 | if (!idev->dead) | |
9f9354b9 ED |
210 | pr_err("Freeing alive in_device %p\n", idev); |
211 | else | |
1da177e4 | 212 | kfree(idev); |
1da177e4 | 213 | } |
9f9354b9 | 214 | EXPORT_SYMBOL(in_dev_finish_destroy); |
1da177e4 | 215 | |
71e27da9 | 216 | static struct in_device *inetdev_init(struct net_device *dev) |
1da177e4 LT |
217 | { |
218 | struct in_device *in_dev; | |
219 | ||
220 | ASSERT_RTNL(); | |
221 | ||
0da974f4 | 222 | in_dev = kzalloc(sizeof(*in_dev), GFP_KERNEL); |
1da177e4 LT |
223 | if (!in_dev) |
224 | goto out; | |
c346dca1 | 225 | memcpy(&in_dev->cnf, dev_net(dev)->ipv4.devconf_dflt, |
9355bbd6 | 226 | sizeof(in_dev->cnf)); |
1da177e4 LT |
227 | in_dev->cnf.sysctl = NULL; |
228 | in_dev->dev = dev; | |
9f9354b9 ED |
229 | in_dev->arp_parms = neigh_parms_alloc(dev, &arp_tbl); |
230 | if (!in_dev->arp_parms) | |
1da177e4 | 231 | goto out_kfree; |
0187bdfb BH |
232 | if (IPV4_DEVCONF(in_dev->cnf, FORWARDING)) |
233 | dev_disable_lro(dev); | |
1da177e4 LT |
234 | /* Reference in_dev->dev */ |
235 | dev_hold(dev); | |
30c4cf57 | 236 | /* Account for reference dev->ip_ptr (below) */ |
1da177e4 | 237 | in_dev_hold(in_dev); |
1da177e4 | 238 | |
66f27a52 | 239 | devinet_sysctl_register(in_dev); |
1da177e4 LT |
240 | ip_mc_init_dev(in_dev); |
241 | if (dev->flags & IFF_UP) | |
242 | ip_mc_up(in_dev); | |
483479ec | 243 | |
30c4cf57 DS |
244 | /* we can receive as soon as ip_ptr is set -- do this last */ |
245 | rcu_assign_pointer(dev->ip_ptr, in_dev); | |
483479ec | 246 | out: |
1da177e4 LT |
247 | return in_dev; |
248 | out_kfree: | |
249 | kfree(in_dev); | |
250 | in_dev = NULL; | |
251 | goto out; | |
252 | } | |
253 | ||
254 | static void in_dev_rcu_put(struct rcu_head *head) | |
255 | { | |
256 | struct in_device *idev = container_of(head, struct in_device, rcu_head); | |
257 | in_dev_put(idev); | |
258 | } | |
259 | ||
260 | static void inetdev_destroy(struct in_device *in_dev) | |
261 | { | |
262 | struct in_ifaddr *ifa; | |
263 | struct net_device *dev; | |
264 | ||
265 | ASSERT_RTNL(); | |
266 | ||
267 | dev = in_dev->dev; | |
1da177e4 LT |
268 | |
269 | in_dev->dead = 1; | |
270 | ||
271 | ip_mc_destroy_dev(in_dev); | |
272 | ||
273 | while ((ifa = in_dev->ifa_list) != NULL) { | |
274 | inet_del_ifa(in_dev, &in_dev->ifa_list, 0); | |
275 | inet_free_ifa(ifa); | |
276 | } | |
277 | ||
95ae6b22 | 278 | rcu_assign_pointer(dev->ip_ptr, NULL); |
1da177e4 | 279 | |
51602b2a | 280 | devinet_sysctl_unregister(in_dev); |
1da177e4 LT |
281 | neigh_parms_release(&arp_tbl, in_dev->arp_parms); |
282 | arp_ifdown(dev); | |
283 | ||
284 | call_rcu(&in_dev->rcu_head, in_dev_rcu_put); | |
285 | } | |
286 | ||
ff428d72 | 287 | int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b) |
1da177e4 LT |
288 | { |
289 | rcu_read_lock(); | |
290 | for_primary_ifa(in_dev) { | |
291 | if (inet_ifa_match(a, ifa)) { | |
292 | if (!b || inet_ifa_match(b, ifa)) { | |
293 | rcu_read_unlock(); | |
294 | return 1; | |
295 | } | |
296 | } | |
297 | } endfor_ifa(in_dev); | |
298 | rcu_read_unlock(); | |
299 | return 0; | |
300 | } | |
301 | ||
d6062cbb TG |
302 | static void __inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap, |
303 | int destroy, struct nlmsghdr *nlh, u32 pid) | |
1da177e4 | 304 | { |
8f937c60 | 305 | struct in_ifaddr *promote = NULL; |
0ff60a45 JHS |
306 | struct in_ifaddr *ifa, *ifa1 = *ifap; |
307 | struct in_ifaddr *last_prim = in_dev->ifa_list; | |
308 | struct in_ifaddr *prev_prom = NULL; | |
309 | int do_promote = IN_DEV_PROMOTE_SECONDARIES(in_dev); | |
1da177e4 LT |
310 | |
311 | ASSERT_RTNL(); | |
312 | ||
e905a9ed | 313 | /* 1. Deleting primary ifaddr forces deletion all secondaries |
8f937c60 HW |
314 | * unless alias promotion is set |
315 | **/ | |
1da177e4 LT |
316 | |
317 | if (!(ifa1->ifa_flags & IFA_F_SECONDARY)) { | |
1da177e4 LT |
318 | struct in_ifaddr **ifap1 = &ifa1->ifa_next; |
319 | ||
320 | while ((ifa = *ifap1) != NULL) { | |
e905a9ed | 321 | if (!(ifa->ifa_flags & IFA_F_SECONDARY) && |
0ff60a45 JHS |
322 | ifa1->ifa_scope <= ifa->ifa_scope) |
323 | last_prim = ifa; | |
324 | ||
1da177e4 LT |
325 | if (!(ifa->ifa_flags & IFA_F_SECONDARY) || |
326 | ifa1->ifa_mask != ifa->ifa_mask || | |
327 | !inet_ifa_match(ifa1->ifa_address, ifa)) { | |
328 | ifap1 = &ifa->ifa_next; | |
0ff60a45 | 329 | prev_prom = ifa; |
1da177e4 LT |
330 | continue; |
331 | } | |
332 | ||
0ff60a45 | 333 | if (!do_promote) { |
fd23c3b3 | 334 | inet_hash_remove(ifa); |
8f937c60 | 335 | *ifap1 = ifa->ifa_next; |
1da177e4 | 336 | |
d6062cbb | 337 | rtmsg_ifa(RTM_DELADDR, ifa, nlh, pid); |
e041c683 AS |
338 | blocking_notifier_call_chain(&inetaddr_chain, |
339 | NETDEV_DOWN, ifa); | |
8f937c60 HW |
340 | inet_free_ifa(ifa); |
341 | } else { | |
342 | promote = ifa; | |
343 | break; | |
344 | } | |
1da177e4 LT |
345 | } |
346 | } | |
347 | ||
348 | /* 2. Unlink it */ | |
349 | ||
350 | *ifap = ifa1->ifa_next; | |
fd23c3b3 | 351 | inet_hash_remove(ifa1); |
1da177e4 LT |
352 | |
353 | /* 3. Announce address deletion */ | |
354 | ||
355 | /* Send message first, then call notifier. | |
356 | At first sight, FIB update triggered by notifier | |
357 | will refer to already deleted ifaddr, that could confuse | |
358 | netlink listeners. It is not true: look, gated sees | |
359 | that route deleted and if it still thinks that ifaddr | |
360 | is valid, it will try to restore deleted routes... Grr. | |
361 | So that, this order is correct. | |
362 | */ | |
d6062cbb | 363 | rtmsg_ifa(RTM_DELADDR, ifa1, nlh, pid); |
e041c683 | 364 | blocking_notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa1); |
1da177e4 | 365 | |
0ff60a45 JHS |
366 | if (promote) { |
367 | ||
368 | if (prev_prom) { | |
369 | prev_prom->ifa_next = promote->ifa_next; | |
370 | promote->ifa_next = last_prim->ifa_next; | |
371 | last_prim->ifa_next = promote; | |
372 | } | |
8f937c60 | 373 | |
8f937c60 | 374 | promote->ifa_flags &= ~IFA_F_SECONDARY; |
d6062cbb | 375 | rtmsg_ifa(RTM_NEWADDR, promote, nlh, pid); |
e041c683 AS |
376 | blocking_notifier_call_chain(&inetaddr_chain, |
377 | NETDEV_UP, promote); | |
0ff60a45 JHS |
378 | for (ifa = promote->ifa_next; ifa; ifa = ifa->ifa_next) { |
379 | if (ifa1->ifa_mask != ifa->ifa_mask || | |
380 | !inet_ifa_match(ifa1->ifa_address, ifa)) | |
381 | continue; | |
382 | fib_add_ifaddr(ifa); | |
383 | } | |
384 | ||
385 | } | |
6363097c | 386 | if (destroy) |
0ff60a45 | 387 | inet_free_ifa(ifa1); |
1da177e4 LT |
388 | } |
389 | ||
d6062cbb TG |
390 | static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap, |
391 | int destroy) | |
392 | { | |
393 | __inet_del_ifa(in_dev, ifap, destroy, NULL, 0); | |
394 | } | |
395 | ||
396 | static int __inet_insert_ifa(struct in_ifaddr *ifa, struct nlmsghdr *nlh, | |
397 | u32 pid) | |
1da177e4 LT |
398 | { |
399 | struct in_device *in_dev = ifa->ifa_dev; | |
400 | struct in_ifaddr *ifa1, **ifap, **last_primary; | |
401 | ||
402 | ASSERT_RTNL(); | |
403 | ||
404 | if (!ifa->ifa_local) { | |
405 | inet_free_ifa(ifa); | |
406 | return 0; | |
407 | } | |
408 | ||
409 | ifa->ifa_flags &= ~IFA_F_SECONDARY; | |
410 | last_primary = &in_dev->ifa_list; | |
411 | ||
412 | for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL; | |
413 | ifap = &ifa1->ifa_next) { | |
414 | if (!(ifa1->ifa_flags & IFA_F_SECONDARY) && | |
415 | ifa->ifa_scope <= ifa1->ifa_scope) | |
416 | last_primary = &ifa1->ifa_next; | |
417 | if (ifa1->ifa_mask == ifa->ifa_mask && | |
418 | inet_ifa_match(ifa1->ifa_address, ifa)) { | |
419 | if (ifa1->ifa_local == ifa->ifa_local) { | |
420 | inet_free_ifa(ifa); | |
421 | return -EEXIST; | |
422 | } | |
423 | if (ifa1->ifa_scope != ifa->ifa_scope) { | |
424 | inet_free_ifa(ifa); | |
425 | return -EINVAL; | |
426 | } | |
427 | ifa->ifa_flags |= IFA_F_SECONDARY; | |
428 | } | |
429 | } | |
430 | ||
431 | if (!(ifa->ifa_flags & IFA_F_SECONDARY)) { | |
432 | net_srandom(ifa->ifa_local); | |
433 | ifap = last_primary; | |
434 | } | |
435 | ||
436 | ifa->ifa_next = *ifap; | |
437 | *ifap = ifa; | |
438 | ||
fd23c3b3 DM |
439 | inet_hash_insert(dev_net(in_dev->dev), ifa); |
440 | ||
1da177e4 LT |
441 | /* Send message first, then call notifier. |
442 | Notifier will trigger FIB update, so that | |
443 | listeners of netlink will know about new ifaddr */ | |
d6062cbb | 444 | rtmsg_ifa(RTM_NEWADDR, ifa, nlh, pid); |
e041c683 | 445 | blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa); |
1da177e4 LT |
446 | |
447 | return 0; | |
448 | } | |
449 | ||
d6062cbb TG |
450 | static int inet_insert_ifa(struct in_ifaddr *ifa) |
451 | { | |
452 | return __inet_insert_ifa(ifa, NULL, 0); | |
453 | } | |
454 | ||
1da177e4 LT |
455 | static int inet_set_ifa(struct net_device *dev, struct in_ifaddr *ifa) |
456 | { | |
e5ed6399 | 457 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
1da177e4 LT |
458 | |
459 | ASSERT_RTNL(); | |
460 | ||
461 | if (!in_dev) { | |
71e27da9 HX |
462 | inet_free_ifa(ifa); |
463 | return -ENOBUFS; | |
1da177e4 | 464 | } |
71e27da9 | 465 | ipv4_devconf_setall(in_dev); |
1da177e4 | 466 | if (ifa->ifa_dev != in_dev) { |
547b792c | 467 | WARN_ON(ifa->ifa_dev); |
1da177e4 LT |
468 | in_dev_hold(in_dev); |
469 | ifa->ifa_dev = in_dev; | |
470 | } | |
f97c1e0c | 471 | if (ipv4_is_loopback(ifa->ifa_local)) |
1da177e4 LT |
472 | ifa->ifa_scope = RT_SCOPE_HOST; |
473 | return inet_insert_ifa(ifa); | |
474 | } | |
475 | ||
8723e1b4 ED |
476 | /* Caller must hold RCU or RTNL : |
477 | * We dont take a reference on found in_device | |
478 | */ | |
7fee0ca2 | 479 | struct in_device *inetdev_by_index(struct net *net, int ifindex) |
1da177e4 LT |
480 | { |
481 | struct net_device *dev; | |
482 | struct in_device *in_dev = NULL; | |
c148fc2e ED |
483 | |
484 | rcu_read_lock(); | |
485 | dev = dev_get_by_index_rcu(net, ifindex); | |
1da177e4 | 486 | if (dev) |
8723e1b4 | 487 | in_dev = rcu_dereference_rtnl(dev->ip_ptr); |
c148fc2e | 488 | rcu_read_unlock(); |
1da177e4 LT |
489 | return in_dev; |
490 | } | |
9f9354b9 | 491 | EXPORT_SYMBOL(inetdev_by_index); |
1da177e4 LT |
492 | |
493 | /* Called only from RTNL semaphored context. No locks. */ | |
494 | ||
60cad5da AV |
495 | struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix, |
496 | __be32 mask) | |
1da177e4 LT |
497 | { |
498 | ASSERT_RTNL(); | |
499 | ||
500 | for_primary_ifa(in_dev) { | |
501 | if (ifa->ifa_mask == mask && inet_ifa_match(prefix, ifa)) | |
502 | return ifa; | |
503 | } endfor_ifa(in_dev); | |
504 | return NULL; | |
505 | } | |
506 | ||
507 | static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) | |
508 | { | |
3b1e0a65 | 509 | struct net *net = sock_net(skb->sk); |
dfdd5fd4 | 510 | struct nlattr *tb[IFA_MAX+1]; |
1da177e4 | 511 | struct in_device *in_dev; |
dfdd5fd4 | 512 | struct ifaddrmsg *ifm; |
1da177e4 | 513 | struct in_ifaddr *ifa, **ifap; |
dfdd5fd4 | 514 | int err = -EINVAL; |
1da177e4 LT |
515 | |
516 | ASSERT_RTNL(); | |
517 | ||
dfdd5fd4 TG |
518 | err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy); |
519 | if (err < 0) | |
520 | goto errout; | |
521 | ||
522 | ifm = nlmsg_data(nlh); | |
7fee0ca2 | 523 | in_dev = inetdev_by_index(net, ifm->ifa_index); |
dfdd5fd4 TG |
524 | if (in_dev == NULL) { |
525 | err = -ENODEV; | |
526 | goto errout; | |
527 | } | |
528 | ||
1da177e4 LT |
529 | for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; |
530 | ifap = &ifa->ifa_next) { | |
dfdd5fd4 | 531 | if (tb[IFA_LOCAL] && |
a7a628c4 | 532 | ifa->ifa_local != nla_get_be32(tb[IFA_LOCAL])) |
dfdd5fd4 TG |
533 | continue; |
534 | ||
535 | if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label)) | |
1da177e4 | 536 | continue; |
dfdd5fd4 TG |
537 | |
538 | if (tb[IFA_ADDRESS] && | |
539 | (ifm->ifa_prefixlen != ifa->ifa_prefixlen || | |
a7a628c4 | 540 | !inet_ifa_match(nla_get_be32(tb[IFA_ADDRESS]), ifa))) |
dfdd5fd4 TG |
541 | continue; |
542 | ||
d6062cbb | 543 | __inet_del_ifa(in_dev, ifap, 1, nlh, NETLINK_CB(skb).pid); |
1da177e4 LT |
544 | return 0; |
545 | } | |
dfdd5fd4 TG |
546 | |
547 | err = -EADDRNOTAVAIL; | |
548 | errout: | |
549 | return err; | |
1da177e4 LT |
550 | } |
551 | ||
4b8aa9ab | 552 | static struct in_ifaddr *rtm_to_ifaddr(struct net *net, struct nlmsghdr *nlh) |
1da177e4 | 553 | { |
5c753978 TG |
554 | struct nlattr *tb[IFA_MAX+1]; |
555 | struct in_ifaddr *ifa; | |
556 | struct ifaddrmsg *ifm; | |
1da177e4 LT |
557 | struct net_device *dev; |
558 | struct in_device *in_dev; | |
7b218574 | 559 | int err; |
1da177e4 | 560 | |
5c753978 TG |
561 | err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy); |
562 | if (err < 0) | |
563 | goto errout; | |
1da177e4 | 564 | |
5c753978 | 565 | ifm = nlmsg_data(nlh); |
7b218574 DL |
566 | err = -EINVAL; |
567 | if (ifm->ifa_prefixlen > 32 || tb[IFA_LOCAL] == NULL) | |
5c753978 | 568 | goto errout; |
1da177e4 | 569 | |
4b8aa9ab | 570 | dev = __dev_get_by_index(net, ifm->ifa_index); |
7b218574 DL |
571 | err = -ENODEV; |
572 | if (dev == NULL) | |
5c753978 | 573 | goto errout; |
1da177e4 | 574 | |
5c753978 | 575 | in_dev = __in_dev_get_rtnl(dev); |
7b218574 DL |
576 | err = -ENOBUFS; |
577 | if (in_dev == NULL) | |
71e27da9 | 578 | goto errout; |
1da177e4 | 579 | |
5c753978 | 580 | ifa = inet_alloc_ifa(); |
7b218574 | 581 | if (ifa == NULL) |
5c753978 TG |
582 | /* |
583 | * A potential indev allocation can be left alive, it stays | |
584 | * assigned to its device and is destroy with it. | |
585 | */ | |
5c753978 | 586 | goto errout; |
5c753978 | 587 | |
a4e65d36 | 588 | ipv4_devconf_setall(in_dev); |
5c753978 TG |
589 | in_dev_hold(in_dev); |
590 | ||
591 | if (tb[IFA_ADDRESS] == NULL) | |
592 | tb[IFA_ADDRESS] = tb[IFA_LOCAL]; | |
1da177e4 | 593 | |
fd23c3b3 | 594 | INIT_HLIST_NODE(&ifa->hash); |
1da177e4 LT |
595 | ifa->ifa_prefixlen = ifm->ifa_prefixlen; |
596 | ifa->ifa_mask = inet_make_mask(ifm->ifa_prefixlen); | |
1da177e4 LT |
597 | ifa->ifa_flags = ifm->ifa_flags; |
598 | ifa->ifa_scope = ifm->ifa_scope; | |
5c753978 TG |
599 | ifa->ifa_dev = in_dev; |
600 | ||
a7a628c4 AV |
601 | ifa->ifa_local = nla_get_be32(tb[IFA_LOCAL]); |
602 | ifa->ifa_address = nla_get_be32(tb[IFA_ADDRESS]); | |
5c753978 TG |
603 | |
604 | if (tb[IFA_BROADCAST]) | |
a7a628c4 | 605 | ifa->ifa_broadcast = nla_get_be32(tb[IFA_BROADCAST]); |
5c753978 | 606 | |
5c753978 TG |
607 | if (tb[IFA_LABEL]) |
608 | nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ); | |
1da177e4 LT |
609 | else |
610 | memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); | |
611 | ||
5c753978 TG |
612 | return ifa; |
613 | ||
614 | errout: | |
615 | return ERR_PTR(err); | |
616 | } | |
617 | ||
618 | static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) | |
619 | { | |
3b1e0a65 | 620 | struct net *net = sock_net(skb->sk); |
5c753978 TG |
621 | struct in_ifaddr *ifa; |
622 | ||
623 | ASSERT_RTNL(); | |
624 | ||
4b8aa9ab | 625 | ifa = rtm_to_ifaddr(net, nlh); |
5c753978 TG |
626 | if (IS_ERR(ifa)) |
627 | return PTR_ERR(ifa); | |
628 | ||
d6062cbb | 629 | return __inet_insert_ifa(ifa, nlh, NETLINK_CB(skb).pid); |
1da177e4 LT |
630 | } |
631 | ||
632 | /* | |
633 | * Determine a default network mask, based on the IP address. | |
634 | */ | |
635 | ||
9f9354b9 | 636 | static inline int inet_abc_len(__be32 addr) |
1da177e4 LT |
637 | { |
638 | int rc = -1; /* Something else, probably a multicast. */ | |
639 | ||
f97c1e0c | 640 | if (ipv4_is_zeronet(addr)) |
e905a9ed | 641 | rc = 0; |
1da177e4 | 642 | else { |
714e85be | 643 | __u32 haddr = ntohl(addr); |
1da177e4 | 644 | |
714e85be | 645 | if (IN_CLASSA(haddr)) |
1da177e4 | 646 | rc = 8; |
714e85be | 647 | else if (IN_CLASSB(haddr)) |
1da177e4 | 648 | rc = 16; |
714e85be | 649 | else if (IN_CLASSC(haddr)) |
1da177e4 LT |
650 | rc = 24; |
651 | } | |
652 | ||
e905a9ed | 653 | return rc; |
1da177e4 LT |
654 | } |
655 | ||
656 | ||
e5b13cb1 | 657 | int devinet_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
1da177e4 LT |
658 | { |
659 | struct ifreq ifr; | |
660 | struct sockaddr_in sin_orig; | |
661 | struct sockaddr_in *sin = (struct sockaddr_in *)&ifr.ifr_addr; | |
662 | struct in_device *in_dev; | |
663 | struct in_ifaddr **ifap = NULL; | |
664 | struct in_ifaddr *ifa = NULL; | |
665 | struct net_device *dev; | |
666 | char *colon; | |
667 | int ret = -EFAULT; | |
668 | int tryaddrmatch = 0; | |
669 | ||
670 | /* | |
671 | * Fetch the caller's info block into kernel space | |
672 | */ | |
673 | ||
674 | if (copy_from_user(&ifr, arg, sizeof(struct ifreq))) | |
675 | goto out; | |
676 | ifr.ifr_name[IFNAMSIZ - 1] = 0; | |
677 | ||
678 | /* save original address for comparison */ | |
679 | memcpy(&sin_orig, sin, sizeof(*sin)); | |
680 | ||
681 | colon = strchr(ifr.ifr_name, ':'); | |
682 | if (colon) | |
683 | *colon = 0; | |
684 | ||
e5b13cb1 | 685 | dev_load(net, ifr.ifr_name); |
1da177e4 | 686 | |
132adf54 | 687 | switch (cmd) { |
1da177e4 LT |
688 | case SIOCGIFADDR: /* Get interface address */ |
689 | case SIOCGIFBRDADDR: /* Get the broadcast address */ | |
690 | case SIOCGIFDSTADDR: /* Get the destination address */ | |
691 | case SIOCGIFNETMASK: /* Get the netmask for the interface */ | |
692 | /* Note that these ioctls will not sleep, | |
693 | so that we do not impose a lock. | |
694 | One day we will be forced to put shlock here (I mean SMP) | |
695 | */ | |
696 | tryaddrmatch = (sin_orig.sin_family == AF_INET); | |
697 | memset(sin, 0, sizeof(*sin)); | |
698 | sin->sin_family = AF_INET; | |
699 | break; | |
700 | ||
701 | case SIOCSIFFLAGS: | |
702 | ret = -EACCES; | |
703 | if (!capable(CAP_NET_ADMIN)) | |
704 | goto out; | |
705 | break; | |
706 | case SIOCSIFADDR: /* Set interface address (and family) */ | |
707 | case SIOCSIFBRDADDR: /* Set the broadcast address */ | |
708 | case SIOCSIFDSTADDR: /* Set the destination address */ | |
709 | case SIOCSIFNETMASK: /* Set the netmask for the interface */ | |
710 | ret = -EACCES; | |
711 | if (!capable(CAP_NET_ADMIN)) | |
712 | goto out; | |
713 | ret = -EINVAL; | |
714 | if (sin->sin_family != AF_INET) | |
715 | goto out; | |
716 | break; | |
717 | default: | |
718 | ret = -EINVAL; | |
719 | goto out; | |
720 | } | |
721 | ||
722 | rtnl_lock(); | |
723 | ||
724 | ret = -ENODEV; | |
9f9354b9 ED |
725 | dev = __dev_get_by_name(net, ifr.ifr_name); |
726 | if (!dev) | |
1da177e4 LT |
727 | goto done; |
728 | ||
729 | if (colon) | |
730 | *colon = ':'; | |
731 | ||
9f9354b9 ED |
732 | in_dev = __in_dev_get_rtnl(dev); |
733 | if (in_dev) { | |
1da177e4 LT |
734 | if (tryaddrmatch) { |
735 | /* Matthias Andree */ | |
736 | /* compare label and address (4.4BSD style) */ | |
737 | /* note: we only do this for a limited set of ioctls | |
738 | and only if the original address family was AF_INET. | |
739 | This is checked above. */ | |
740 | for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; | |
741 | ifap = &ifa->ifa_next) { | |
742 | if (!strcmp(ifr.ifr_name, ifa->ifa_label) && | |
743 | sin_orig.sin_addr.s_addr == | |
744 | ifa->ifa_address) { | |
745 | break; /* found */ | |
746 | } | |
747 | } | |
748 | } | |
749 | /* we didn't get a match, maybe the application is | |
750 | 4.3BSD-style and passed in junk so we fall back to | |
751 | comparing just the label */ | |
752 | if (!ifa) { | |
753 | for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; | |
754 | ifap = &ifa->ifa_next) | |
755 | if (!strcmp(ifr.ifr_name, ifa->ifa_label)) | |
756 | break; | |
757 | } | |
758 | } | |
759 | ||
760 | ret = -EADDRNOTAVAIL; | |
761 | if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS) | |
762 | goto done; | |
763 | ||
132adf54 | 764 | switch (cmd) { |
1da177e4 LT |
765 | case SIOCGIFADDR: /* Get interface address */ |
766 | sin->sin_addr.s_addr = ifa->ifa_local; | |
767 | goto rarok; | |
768 | ||
769 | case SIOCGIFBRDADDR: /* Get the broadcast address */ | |
770 | sin->sin_addr.s_addr = ifa->ifa_broadcast; | |
771 | goto rarok; | |
772 | ||
773 | case SIOCGIFDSTADDR: /* Get the destination address */ | |
774 | sin->sin_addr.s_addr = ifa->ifa_address; | |
775 | goto rarok; | |
776 | ||
777 | case SIOCGIFNETMASK: /* Get the netmask for the interface */ | |
778 | sin->sin_addr.s_addr = ifa->ifa_mask; | |
779 | goto rarok; | |
780 | ||
781 | case SIOCSIFFLAGS: | |
782 | if (colon) { | |
783 | ret = -EADDRNOTAVAIL; | |
784 | if (!ifa) | |
785 | break; | |
786 | ret = 0; | |
787 | if (!(ifr.ifr_flags & IFF_UP)) | |
788 | inet_del_ifa(in_dev, ifap, 1); | |
789 | break; | |
790 | } | |
791 | ret = dev_change_flags(dev, ifr.ifr_flags); | |
792 | break; | |
793 | ||
794 | case SIOCSIFADDR: /* Set interface address (and family) */ | |
795 | ret = -EINVAL; | |
796 | if (inet_abc_len(sin->sin_addr.s_addr) < 0) | |
797 | break; | |
798 | ||
799 | if (!ifa) { | |
800 | ret = -ENOBUFS; | |
9f9354b9 | 801 | ifa = inet_alloc_ifa(); |
fd23c3b3 | 802 | INIT_HLIST_NODE(&ifa->hash); |
9f9354b9 | 803 | if (!ifa) |
1da177e4 LT |
804 | break; |
805 | if (colon) | |
806 | memcpy(ifa->ifa_label, ifr.ifr_name, IFNAMSIZ); | |
807 | else | |
808 | memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); | |
809 | } else { | |
810 | ret = 0; | |
811 | if (ifa->ifa_local == sin->sin_addr.s_addr) | |
812 | break; | |
813 | inet_del_ifa(in_dev, ifap, 0); | |
814 | ifa->ifa_broadcast = 0; | |
148f9729 | 815 | ifa->ifa_scope = 0; |
1da177e4 LT |
816 | } |
817 | ||
818 | ifa->ifa_address = ifa->ifa_local = sin->sin_addr.s_addr; | |
819 | ||
820 | if (!(dev->flags & IFF_POINTOPOINT)) { | |
821 | ifa->ifa_prefixlen = inet_abc_len(ifa->ifa_address); | |
822 | ifa->ifa_mask = inet_make_mask(ifa->ifa_prefixlen); | |
823 | if ((dev->flags & IFF_BROADCAST) && | |
824 | ifa->ifa_prefixlen < 31) | |
825 | ifa->ifa_broadcast = ifa->ifa_address | | |
826 | ~ifa->ifa_mask; | |
827 | } else { | |
828 | ifa->ifa_prefixlen = 32; | |
829 | ifa->ifa_mask = inet_make_mask(32); | |
830 | } | |
831 | ret = inet_set_ifa(dev, ifa); | |
832 | break; | |
833 | ||
834 | case SIOCSIFBRDADDR: /* Set the broadcast address */ | |
835 | ret = 0; | |
836 | if (ifa->ifa_broadcast != sin->sin_addr.s_addr) { | |
837 | inet_del_ifa(in_dev, ifap, 0); | |
838 | ifa->ifa_broadcast = sin->sin_addr.s_addr; | |
839 | inet_insert_ifa(ifa); | |
840 | } | |
841 | break; | |
842 | ||
843 | case SIOCSIFDSTADDR: /* Set the destination address */ | |
844 | ret = 0; | |
845 | if (ifa->ifa_address == sin->sin_addr.s_addr) | |
846 | break; | |
847 | ret = -EINVAL; | |
848 | if (inet_abc_len(sin->sin_addr.s_addr) < 0) | |
849 | break; | |
850 | ret = 0; | |
851 | inet_del_ifa(in_dev, ifap, 0); | |
852 | ifa->ifa_address = sin->sin_addr.s_addr; | |
853 | inet_insert_ifa(ifa); | |
854 | break; | |
855 | ||
856 | case SIOCSIFNETMASK: /* Set the netmask for the interface */ | |
857 | ||
858 | /* | |
859 | * The mask we set must be legal. | |
860 | */ | |
861 | ret = -EINVAL; | |
862 | if (bad_mask(sin->sin_addr.s_addr, 0)) | |
863 | break; | |
864 | ret = 0; | |
865 | if (ifa->ifa_mask != sin->sin_addr.s_addr) { | |
a144ea4b | 866 | __be32 old_mask = ifa->ifa_mask; |
1da177e4 LT |
867 | inet_del_ifa(in_dev, ifap, 0); |
868 | ifa->ifa_mask = sin->sin_addr.s_addr; | |
869 | ifa->ifa_prefixlen = inet_mask_len(ifa->ifa_mask); | |
870 | ||
871 | /* See if current broadcast address matches | |
872 | * with current netmask, then recalculate | |
873 | * the broadcast address. Otherwise it's a | |
874 | * funny address, so don't touch it since | |
875 | * the user seems to know what (s)he's doing... | |
876 | */ | |
877 | if ((dev->flags & IFF_BROADCAST) && | |
878 | (ifa->ifa_prefixlen < 31) && | |
879 | (ifa->ifa_broadcast == | |
dcab5e1e | 880 | (ifa->ifa_local|~old_mask))) { |
1da177e4 LT |
881 | ifa->ifa_broadcast = (ifa->ifa_local | |
882 | ~sin->sin_addr.s_addr); | |
883 | } | |
884 | inet_insert_ifa(ifa); | |
885 | } | |
886 | break; | |
887 | } | |
888 | done: | |
889 | rtnl_unlock(); | |
890 | out: | |
891 | return ret; | |
892 | rarok: | |
893 | rtnl_unlock(); | |
894 | ret = copy_to_user(arg, &ifr, sizeof(struct ifreq)) ? -EFAULT : 0; | |
895 | goto out; | |
896 | } | |
897 | ||
898 | static int inet_gifconf(struct net_device *dev, char __user *buf, int len) | |
899 | { | |
e5ed6399 | 900 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
1da177e4 LT |
901 | struct in_ifaddr *ifa; |
902 | struct ifreq ifr; | |
903 | int done = 0; | |
904 | ||
9f9354b9 | 905 | if (!in_dev) |
1da177e4 LT |
906 | goto out; |
907 | ||
9f9354b9 | 908 | for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { |
1da177e4 LT |
909 | if (!buf) { |
910 | done += sizeof(ifr); | |
911 | continue; | |
912 | } | |
913 | if (len < (int) sizeof(ifr)) | |
914 | break; | |
915 | memset(&ifr, 0, sizeof(struct ifreq)); | |
916 | if (ifa->ifa_label) | |
917 | strcpy(ifr.ifr_name, ifa->ifa_label); | |
918 | else | |
919 | strcpy(ifr.ifr_name, dev->name); | |
920 | ||
921 | (*(struct sockaddr_in *)&ifr.ifr_addr).sin_family = AF_INET; | |
922 | (*(struct sockaddr_in *)&ifr.ifr_addr).sin_addr.s_addr = | |
923 | ifa->ifa_local; | |
924 | ||
925 | if (copy_to_user(buf, &ifr, sizeof(struct ifreq))) { | |
926 | done = -EFAULT; | |
927 | break; | |
928 | } | |
929 | buf += sizeof(struct ifreq); | |
930 | len -= sizeof(struct ifreq); | |
931 | done += sizeof(struct ifreq); | |
932 | } | |
933 | out: | |
934 | return done; | |
935 | } | |
936 | ||
a61ced5d | 937 | __be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope) |
1da177e4 | 938 | { |
a61ced5d | 939 | __be32 addr = 0; |
1da177e4 | 940 | struct in_device *in_dev; |
c346dca1 | 941 | struct net *net = dev_net(dev); |
1da177e4 LT |
942 | |
943 | rcu_read_lock(); | |
e5ed6399 | 944 | in_dev = __in_dev_get_rcu(dev); |
1da177e4 LT |
945 | if (!in_dev) |
946 | goto no_in_dev; | |
947 | ||
948 | for_primary_ifa(in_dev) { | |
949 | if (ifa->ifa_scope > scope) | |
950 | continue; | |
951 | if (!dst || inet_ifa_match(dst, ifa)) { | |
952 | addr = ifa->ifa_local; | |
953 | break; | |
954 | } | |
955 | if (!addr) | |
956 | addr = ifa->ifa_local; | |
957 | } endfor_ifa(in_dev); | |
1da177e4 LT |
958 | |
959 | if (addr) | |
c6d14c84 | 960 | goto out_unlock; |
9f9354b9 | 961 | no_in_dev: |
1da177e4 LT |
962 | |
963 | /* Not loopback addresses on loopback should be preferred | |
964 | in this case. It is importnat that lo is the first interface | |
965 | in dev_base list. | |
966 | */ | |
c6d14c84 | 967 | for_each_netdev_rcu(net, dev) { |
9f9354b9 ED |
968 | in_dev = __in_dev_get_rcu(dev); |
969 | if (!in_dev) | |
1da177e4 LT |
970 | continue; |
971 | ||
972 | for_primary_ifa(in_dev) { | |
973 | if (ifa->ifa_scope != RT_SCOPE_LINK && | |
974 | ifa->ifa_scope <= scope) { | |
975 | addr = ifa->ifa_local; | |
c6d14c84 | 976 | goto out_unlock; |
1da177e4 LT |
977 | } |
978 | } endfor_ifa(in_dev); | |
979 | } | |
c6d14c84 | 980 | out_unlock: |
1da177e4 | 981 | rcu_read_unlock(); |
1da177e4 LT |
982 | return addr; |
983 | } | |
9f9354b9 | 984 | EXPORT_SYMBOL(inet_select_addr); |
1da177e4 | 985 | |
60cad5da AV |
986 | static __be32 confirm_addr_indev(struct in_device *in_dev, __be32 dst, |
987 | __be32 local, int scope) | |
1da177e4 LT |
988 | { |
989 | int same = 0; | |
a144ea4b | 990 | __be32 addr = 0; |
1da177e4 LT |
991 | |
992 | for_ifa(in_dev) { | |
993 | if (!addr && | |
994 | (local == ifa->ifa_local || !local) && | |
995 | ifa->ifa_scope <= scope) { | |
996 | addr = ifa->ifa_local; | |
997 | if (same) | |
998 | break; | |
999 | } | |
1000 | if (!same) { | |
1001 | same = (!local || inet_ifa_match(local, ifa)) && | |
1002 | (!dst || inet_ifa_match(dst, ifa)); | |
1003 | if (same && addr) { | |
1004 | if (local || !dst) | |
1005 | break; | |
1006 | /* Is the selected addr into dst subnet? */ | |
1007 | if (inet_ifa_match(addr, ifa)) | |
1008 | break; | |
1009 | /* No, then can we use new local src? */ | |
1010 | if (ifa->ifa_scope <= scope) { | |
1011 | addr = ifa->ifa_local; | |
1012 | break; | |
1013 | } | |
1014 | /* search for large dst subnet for addr */ | |
1015 | same = 0; | |
1016 | } | |
1017 | } | |
1018 | } endfor_ifa(in_dev); | |
1019 | ||
9f9354b9 | 1020 | return same ? addr : 0; |
1da177e4 LT |
1021 | } |
1022 | ||
1023 | /* | |
1024 | * Confirm that local IP address exists using wildcards: | |
9bd85e32 | 1025 | * - in_dev: only on this interface, 0=any interface |
1da177e4 LT |
1026 | * - dst: only in the same subnet as dst, 0=any dst |
1027 | * - local: address, 0=autoselect the local address | |
1028 | * - scope: maximum allowed scope value for the local address | |
1029 | */ | |
9bd85e32 DL |
1030 | __be32 inet_confirm_addr(struct in_device *in_dev, |
1031 | __be32 dst, __be32 local, int scope) | |
1da177e4 | 1032 | { |
60cad5da | 1033 | __be32 addr = 0; |
9bd85e32 | 1034 | struct net_device *dev; |
39a6d063 | 1035 | struct net *net; |
1da177e4 | 1036 | |
39a6d063 | 1037 | if (scope != RT_SCOPE_LINK) |
9bd85e32 | 1038 | return confirm_addr_indev(in_dev, dst, local, scope); |
1da177e4 | 1039 | |
c346dca1 | 1040 | net = dev_net(in_dev->dev); |
1da177e4 | 1041 | rcu_read_lock(); |
c6d14c84 | 1042 | for_each_netdev_rcu(net, dev) { |
9f9354b9 ED |
1043 | in_dev = __in_dev_get_rcu(dev); |
1044 | if (in_dev) { | |
1da177e4 LT |
1045 | addr = confirm_addr_indev(in_dev, dst, local, scope); |
1046 | if (addr) | |
1047 | break; | |
1048 | } | |
1049 | } | |
1050 | rcu_read_unlock(); | |
1da177e4 LT |
1051 | |
1052 | return addr; | |
1053 | } | |
1054 | ||
1055 | /* | |
1056 | * Device notifier | |
1057 | */ | |
1058 | ||
1059 | int register_inetaddr_notifier(struct notifier_block *nb) | |
1060 | { | |
e041c683 | 1061 | return blocking_notifier_chain_register(&inetaddr_chain, nb); |
1da177e4 | 1062 | } |
9f9354b9 | 1063 | EXPORT_SYMBOL(register_inetaddr_notifier); |
1da177e4 LT |
1064 | |
1065 | int unregister_inetaddr_notifier(struct notifier_block *nb) | |
1066 | { | |
e041c683 | 1067 | return blocking_notifier_chain_unregister(&inetaddr_chain, nb); |
1da177e4 | 1068 | } |
9f9354b9 | 1069 | EXPORT_SYMBOL(unregister_inetaddr_notifier); |
1da177e4 | 1070 | |
9f9354b9 ED |
1071 | /* Rename ifa_labels for a device name change. Make some effort to preserve |
1072 | * existing alias numbering and to create unique labels if possible. | |
1da177e4 LT |
1073 | */ |
1074 | static void inetdev_changename(struct net_device *dev, struct in_device *in_dev) | |
e905a9ed | 1075 | { |
1da177e4 LT |
1076 | struct in_ifaddr *ifa; |
1077 | int named = 0; | |
1078 | ||
e905a9ed YH |
1079 | for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { |
1080 | char old[IFNAMSIZ], *dot; | |
1da177e4 LT |
1081 | |
1082 | memcpy(old, ifa->ifa_label, IFNAMSIZ); | |
e905a9ed | 1083 | memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); |
1da177e4 | 1084 | if (named++ == 0) |
573bf470 | 1085 | goto skip; |
44344b2a | 1086 | dot = strchr(old, ':'); |
e905a9ed YH |
1087 | if (dot == NULL) { |
1088 | sprintf(old, ":%d", named); | |
1da177e4 LT |
1089 | dot = old; |
1090 | } | |
9f9354b9 | 1091 | if (strlen(dot) + strlen(dev->name) < IFNAMSIZ) |
e905a9ed | 1092 | strcat(ifa->ifa_label, dot); |
9f9354b9 | 1093 | else |
e905a9ed | 1094 | strcpy(ifa->ifa_label + (IFNAMSIZ - strlen(dot) - 1), dot); |
573bf470 TG |
1095 | skip: |
1096 | rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0); | |
e905a9ed YH |
1097 | } |
1098 | } | |
1da177e4 | 1099 | |
06770843 BL |
1100 | static inline bool inetdev_valid_mtu(unsigned mtu) |
1101 | { | |
1102 | return mtu >= 68; | |
1103 | } | |
1104 | ||
1da177e4 LT |
1105 | /* Called only under RTNL semaphore */ |
1106 | ||
1107 | static int inetdev_event(struct notifier_block *this, unsigned long event, | |
1108 | void *ptr) | |
1109 | { | |
1110 | struct net_device *dev = ptr; | |
e5ed6399 | 1111 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
1da177e4 LT |
1112 | |
1113 | ASSERT_RTNL(); | |
1114 | ||
1115 | if (!in_dev) { | |
8030f544 | 1116 | if (event == NETDEV_REGISTER) { |
1da177e4 | 1117 | in_dev = inetdev_init(dev); |
b217d616 HX |
1118 | if (!in_dev) |
1119 | return notifier_from_errno(-ENOMEM); | |
0cc217e1 | 1120 | if (dev->flags & IFF_LOOPBACK) { |
42f811b8 HX |
1121 | IN_DEV_CONF_SET(in_dev, NOXFRM, 1); |
1122 | IN_DEV_CONF_SET(in_dev, NOPOLICY, 1); | |
8030f544 | 1123 | } |
06770843 BL |
1124 | } else if (event == NETDEV_CHANGEMTU) { |
1125 | /* Re-enabling IP */ | |
1126 | if (inetdev_valid_mtu(dev->mtu)) | |
1127 | in_dev = inetdev_init(dev); | |
1da177e4 LT |
1128 | } |
1129 | goto out; | |
1130 | } | |
1131 | ||
1132 | switch (event) { | |
1133 | case NETDEV_REGISTER: | |
1134 | printk(KERN_DEBUG "inetdev_event: bug\n"); | |
95ae6b22 | 1135 | rcu_assign_pointer(dev->ip_ptr, NULL); |
1da177e4 LT |
1136 | break; |
1137 | case NETDEV_UP: | |
06770843 | 1138 | if (!inetdev_valid_mtu(dev->mtu)) |
1da177e4 | 1139 | break; |
0cc217e1 | 1140 | if (dev->flags & IFF_LOOPBACK) { |
9f9354b9 ED |
1141 | struct in_ifaddr *ifa = inet_alloc_ifa(); |
1142 | ||
1143 | if (ifa) { | |
fd23c3b3 | 1144 | INIT_HLIST_NODE(&ifa->hash); |
1da177e4 LT |
1145 | ifa->ifa_local = |
1146 | ifa->ifa_address = htonl(INADDR_LOOPBACK); | |
1147 | ifa->ifa_prefixlen = 8; | |
1148 | ifa->ifa_mask = inet_make_mask(8); | |
1149 | in_dev_hold(in_dev); | |
1150 | ifa->ifa_dev = in_dev; | |
1151 | ifa->ifa_scope = RT_SCOPE_HOST; | |
1152 | memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); | |
1153 | inet_insert_ifa(ifa); | |
1154 | } | |
1155 | } | |
1156 | ip_mc_up(in_dev); | |
eefef1cf | 1157 | /* fall through */ |
06c4648d | 1158 | case NETDEV_NOTIFY_PEERS: |
eefef1cf | 1159 | case NETDEV_CHANGEADDR: |
a21090cf SH |
1160 | /* Send gratuitous ARP to notify of link change */ |
1161 | if (IN_DEV_ARP_NOTIFY(in_dev)) { | |
1162 | struct in_ifaddr *ifa = in_dev->ifa_list; | |
1163 | ||
1164 | if (ifa) | |
1165 | arp_send(ARPOP_REQUEST, ETH_P_ARP, | |
1166 | ifa->ifa_address, dev, | |
1167 | ifa->ifa_address, NULL, | |
1168 | dev->dev_addr, NULL); | |
1169 | } | |
1da177e4 LT |
1170 | break; |
1171 | case NETDEV_DOWN: | |
1172 | ip_mc_down(in_dev); | |
1173 | break; | |
93d9b7d7 | 1174 | case NETDEV_PRE_TYPE_CHANGE: |
75c78500 MS |
1175 | ip_mc_unmap(in_dev); |
1176 | break; | |
93d9b7d7 | 1177 | case NETDEV_POST_TYPE_CHANGE: |
75c78500 MS |
1178 | ip_mc_remap(in_dev); |
1179 | break; | |
1da177e4 | 1180 | case NETDEV_CHANGEMTU: |
06770843 | 1181 | if (inetdev_valid_mtu(dev->mtu)) |
1da177e4 | 1182 | break; |
06770843 | 1183 | /* disable IP when MTU is not enough */ |
1da177e4 LT |
1184 | case NETDEV_UNREGISTER: |
1185 | inetdev_destroy(in_dev); | |
1186 | break; | |
1187 | case NETDEV_CHANGENAME: | |
1188 | /* Do not notify about label change, this event is | |
1189 | * not interesting to applications using netlink. | |
1190 | */ | |
1191 | inetdev_changename(dev, in_dev); | |
1192 | ||
51602b2a | 1193 | devinet_sysctl_unregister(in_dev); |
66f27a52 | 1194 | devinet_sysctl_register(in_dev); |
1da177e4 LT |
1195 | break; |
1196 | } | |
1197 | out: | |
1198 | return NOTIFY_DONE; | |
1199 | } | |
1200 | ||
1201 | static struct notifier_block ip_netdev_notifier = { | |
539afedf | 1202 | .notifier_call = inetdev_event, |
1da177e4 LT |
1203 | }; |
1204 | ||
339bf98f TG |
1205 | static inline size_t inet_nlmsg_size(void) |
1206 | { | |
1207 | return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) | |
1208 | + nla_total_size(4) /* IFA_ADDRESS */ | |
1209 | + nla_total_size(4) /* IFA_LOCAL */ | |
1210 | + nla_total_size(4) /* IFA_BROADCAST */ | |
339bf98f TG |
1211 | + nla_total_size(IFNAMSIZ); /* IFA_LABEL */ |
1212 | } | |
1213 | ||
1da177e4 | 1214 | static int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa, |
b6544c0b | 1215 | u32 pid, u32 seq, int event, unsigned int flags) |
1da177e4 LT |
1216 | { |
1217 | struct ifaddrmsg *ifm; | |
1218 | struct nlmsghdr *nlh; | |
1da177e4 | 1219 | |
47f68512 TG |
1220 | nlh = nlmsg_put(skb, pid, seq, event, sizeof(*ifm), flags); |
1221 | if (nlh == NULL) | |
26932566 | 1222 | return -EMSGSIZE; |
47f68512 TG |
1223 | |
1224 | ifm = nlmsg_data(nlh); | |
1da177e4 LT |
1225 | ifm->ifa_family = AF_INET; |
1226 | ifm->ifa_prefixlen = ifa->ifa_prefixlen; | |
1227 | ifm->ifa_flags = ifa->ifa_flags|IFA_F_PERMANENT; | |
1228 | ifm->ifa_scope = ifa->ifa_scope; | |
1229 | ifm->ifa_index = ifa->ifa_dev->dev->ifindex; | |
47f68512 | 1230 | |
1da177e4 | 1231 | if (ifa->ifa_address) |
a7a628c4 | 1232 | NLA_PUT_BE32(skb, IFA_ADDRESS, ifa->ifa_address); |
47f68512 | 1233 | |
1da177e4 | 1234 | if (ifa->ifa_local) |
a7a628c4 | 1235 | NLA_PUT_BE32(skb, IFA_LOCAL, ifa->ifa_local); |
47f68512 | 1236 | |
1da177e4 | 1237 | if (ifa->ifa_broadcast) |
a7a628c4 | 1238 | NLA_PUT_BE32(skb, IFA_BROADCAST, ifa->ifa_broadcast); |
47f68512 | 1239 | |
1da177e4 | 1240 | if (ifa->ifa_label[0]) |
47f68512 | 1241 | NLA_PUT_STRING(skb, IFA_LABEL, ifa->ifa_label); |
1da177e4 | 1242 | |
47f68512 TG |
1243 | return nlmsg_end(skb, nlh); |
1244 | ||
1245 | nla_put_failure: | |
26932566 PM |
1246 | nlmsg_cancel(skb, nlh); |
1247 | return -EMSGSIZE; | |
1da177e4 LT |
1248 | } |
1249 | ||
1250 | static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) | |
1251 | { | |
3b1e0a65 | 1252 | struct net *net = sock_net(skb->sk); |
eec4df98 ED |
1253 | int h, s_h; |
1254 | int idx, s_idx; | |
1255 | int ip_idx, s_ip_idx; | |
1da177e4 LT |
1256 | struct net_device *dev; |
1257 | struct in_device *in_dev; | |
1258 | struct in_ifaddr *ifa; | |
eec4df98 ED |
1259 | struct hlist_head *head; |
1260 | struct hlist_node *node; | |
1da177e4 | 1261 | |
eec4df98 ED |
1262 | s_h = cb->args[0]; |
1263 | s_idx = idx = cb->args[1]; | |
1264 | s_ip_idx = ip_idx = cb->args[2]; | |
1265 | ||
1266 | for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { | |
1267 | idx = 0; | |
1268 | head = &net->dev_index_head[h]; | |
1269 | rcu_read_lock(); | |
1270 | hlist_for_each_entry_rcu(dev, node, head, index_hlist) { | |
1271 | if (idx < s_idx) | |
1272 | goto cont; | |
4b97efdf | 1273 | if (h > s_h || idx > s_idx) |
eec4df98 ED |
1274 | s_ip_idx = 0; |
1275 | in_dev = __in_dev_get_rcu(dev); | |
1276 | if (!in_dev) | |
1277 | goto cont; | |
1da177e4 | 1278 | |
eec4df98 ED |
1279 | for (ifa = in_dev->ifa_list, ip_idx = 0; ifa; |
1280 | ifa = ifa->ifa_next, ip_idx++) { | |
1281 | if (ip_idx < s_ip_idx) | |
1282 | continue; | |
1283 | if (inet_fill_ifaddr(skb, ifa, | |
1284 | NETLINK_CB(cb->skb).pid, | |
1da177e4 | 1285 | cb->nlh->nlmsg_seq, |
eec4df98 ED |
1286 | RTM_NEWADDR, NLM_F_MULTI) <= 0) { |
1287 | rcu_read_unlock(); | |
1288 | goto done; | |
1289 | } | |
1290 | } | |
7562f876 | 1291 | cont: |
eec4df98 ED |
1292 | idx++; |
1293 | } | |
1294 | rcu_read_unlock(); | |
1da177e4 LT |
1295 | } |
1296 | ||
1297 | done: | |
eec4df98 ED |
1298 | cb->args[0] = h; |
1299 | cb->args[1] = idx; | |
1300 | cb->args[2] = ip_idx; | |
1da177e4 LT |
1301 | |
1302 | return skb->len; | |
1303 | } | |
1304 | ||
539afedf | 1305 | static void rtmsg_ifa(int event, struct in_ifaddr *ifa, struct nlmsghdr *nlh, |
d6062cbb | 1306 | u32 pid) |
1da177e4 | 1307 | { |
47f68512 | 1308 | struct sk_buff *skb; |
d6062cbb TG |
1309 | u32 seq = nlh ? nlh->nlmsg_seq : 0; |
1310 | int err = -ENOBUFS; | |
4b8aa9ab | 1311 | struct net *net; |
1da177e4 | 1312 | |
c346dca1 | 1313 | net = dev_net(ifa->ifa_dev->dev); |
339bf98f | 1314 | skb = nlmsg_new(inet_nlmsg_size(), GFP_KERNEL); |
47f68512 | 1315 | if (skb == NULL) |
d6062cbb TG |
1316 | goto errout; |
1317 | ||
1318 | err = inet_fill_ifaddr(skb, ifa, pid, seq, event, 0); | |
26932566 PM |
1319 | if (err < 0) { |
1320 | /* -EMSGSIZE implies BUG in inet_nlmsg_size() */ | |
1321 | WARN_ON(err == -EMSGSIZE); | |
1322 | kfree_skb(skb); | |
1323 | goto errout; | |
1324 | } | |
1ce85fe4 PNA |
1325 | rtnl_notify(skb, net, pid, RTNLGRP_IPV4_IFADDR, nlh, GFP_KERNEL); |
1326 | return; | |
d6062cbb TG |
1327 | errout: |
1328 | if (err < 0) | |
4b8aa9ab | 1329 | rtnl_set_sk_err(net, RTNLGRP_IPV4_IFADDR, err); |
1da177e4 LT |
1330 | } |
1331 | ||
9f0f7272 TG |
1332 | static size_t inet_get_link_af_size(const struct net_device *dev) |
1333 | { | |
f7fce74e | 1334 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
9f0f7272 TG |
1335 | |
1336 | if (!in_dev) | |
1337 | return 0; | |
1338 | ||
1339 | return nla_total_size(IPV4_DEVCONF_MAX * 4); /* IFLA_INET_CONF */ | |
1340 | } | |
1341 | ||
1342 | static int inet_fill_link_af(struct sk_buff *skb, const struct net_device *dev) | |
1343 | { | |
f7fce74e | 1344 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
9f0f7272 TG |
1345 | struct nlattr *nla; |
1346 | int i; | |
1347 | ||
1348 | if (!in_dev) | |
1349 | return -ENODATA; | |
1350 | ||
1351 | nla = nla_reserve(skb, IFLA_INET_CONF, IPV4_DEVCONF_MAX * 4); | |
1352 | if (nla == NULL) | |
1353 | return -EMSGSIZE; | |
1354 | ||
1355 | for (i = 0; i < IPV4_DEVCONF_MAX; i++) | |
1356 | ((u32 *) nla_data(nla))[i] = in_dev->cnf.data[i]; | |
1357 | ||
1358 | return 0; | |
1359 | } | |
1360 | ||
1361 | static const struct nla_policy inet_af_policy[IFLA_INET_MAX+1] = { | |
1362 | [IFLA_INET_CONF] = { .type = NLA_NESTED }, | |
1363 | }; | |
1364 | ||
cf7afbfe TG |
1365 | static int inet_validate_link_af(const struct net_device *dev, |
1366 | const struct nlattr *nla) | |
9f0f7272 | 1367 | { |
9f0f7272 TG |
1368 | struct nlattr *a, *tb[IFLA_INET_MAX+1]; |
1369 | int err, rem; | |
1370 | ||
f7fce74e | 1371 | if (dev && !__in_dev_get_rtnl(dev)) |
cf7afbfe | 1372 | return -EAFNOSUPPORT; |
9f0f7272 TG |
1373 | |
1374 | err = nla_parse_nested(tb, IFLA_INET_MAX, nla, inet_af_policy); | |
1375 | if (err < 0) | |
1376 | return err; | |
1377 | ||
1378 | if (tb[IFLA_INET_CONF]) { | |
1379 | nla_for_each_nested(a, tb[IFLA_INET_CONF], rem) { | |
1380 | int cfgid = nla_type(a); | |
1381 | ||
1382 | if (nla_len(a) < 4) | |
1383 | return -EINVAL; | |
1384 | ||
1385 | if (cfgid <= 0 || cfgid > IPV4_DEVCONF_MAX) | |
1386 | return -EINVAL; | |
1387 | } | |
1388 | } | |
1389 | ||
cf7afbfe TG |
1390 | return 0; |
1391 | } | |
1392 | ||
1393 | static int inet_set_link_af(struct net_device *dev, const struct nlattr *nla) | |
1394 | { | |
f7fce74e | 1395 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
cf7afbfe TG |
1396 | struct nlattr *a, *tb[IFLA_INET_MAX+1]; |
1397 | int rem; | |
1398 | ||
1399 | if (!in_dev) | |
1400 | return -EAFNOSUPPORT; | |
1401 | ||
1402 | if (nla_parse_nested(tb, IFLA_INET_MAX, nla, NULL) < 0) | |
1403 | BUG(); | |
1404 | ||
9f0f7272 TG |
1405 | if (tb[IFLA_INET_CONF]) { |
1406 | nla_for_each_nested(a, tb[IFLA_INET_CONF], rem) | |
1407 | ipv4_devconf_set(in_dev, nla_type(a), nla_get_u32(a)); | |
1408 | } | |
1409 | ||
1410 | return 0; | |
1411 | } | |
1412 | ||
1da177e4 LT |
1413 | #ifdef CONFIG_SYSCTL |
1414 | ||
c0ce9fb3 | 1415 | static void devinet_copy_dflt_conf(struct net *net, int i) |
31be3085 HX |
1416 | { |
1417 | struct net_device *dev; | |
1418 | ||
c6d14c84 ED |
1419 | rcu_read_lock(); |
1420 | for_each_netdev_rcu(net, dev) { | |
31be3085 | 1421 | struct in_device *in_dev; |
c6d14c84 | 1422 | |
31be3085 HX |
1423 | in_dev = __in_dev_get_rcu(dev); |
1424 | if (in_dev && !test_bit(i, in_dev->cnf.state)) | |
9355bbd6 | 1425 | in_dev->cnf.data[i] = net->ipv4.devconf_dflt->data[i]; |
31be3085 | 1426 | } |
c6d14c84 | 1427 | rcu_read_unlock(); |
31be3085 HX |
1428 | } |
1429 | ||
c6d14c84 | 1430 | /* called with RTNL locked */ |
c0ce9fb3 | 1431 | static void inet_forward_change(struct net *net) |
68dd299b PE |
1432 | { |
1433 | struct net_device *dev; | |
586f1211 | 1434 | int on = IPV4_DEVCONF_ALL(net, FORWARDING); |
68dd299b | 1435 | |
586f1211 | 1436 | IPV4_DEVCONF_ALL(net, ACCEPT_REDIRECTS) = !on; |
9355bbd6 | 1437 | IPV4_DEVCONF_DFLT(net, FORWARDING) = on; |
68dd299b | 1438 | |
c0ce9fb3 | 1439 | for_each_netdev(net, dev) { |
68dd299b | 1440 | struct in_device *in_dev; |
0187bdfb BH |
1441 | if (on) |
1442 | dev_disable_lro(dev); | |
68dd299b PE |
1443 | rcu_read_lock(); |
1444 | in_dev = __in_dev_get_rcu(dev); | |
1445 | if (in_dev) | |
1446 | IN_DEV_CONF_SET(in_dev, FORWARDING, on); | |
1447 | rcu_read_unlock(); | |
1448 | } | |
68dd299b PE |
1449 | } |
1450 | ||
31be3085 | 1451 | static int devinet_conf_proc(ctl_table *ctl, int write, |
8d65af78 | 1452 | void __user *buffer, |
31be3085 HX |
1453 | size_t *lenp, loff_t *ppos) |
1454 | { | |
8d65af78 | 1455 | int ret = proc_dointvec(ctl, write, buffer, lenp, ppos); |
31be3085 HX |
1456 | |
1457 | if (write) { | |
1458 | struct ipv4_devconf *cnf = ctl->extra1; | |
c0ce9fb3 | 1459 | struct net *net = ctl->extra2; |
31be3085 HX |
1460 | int i = (int *)ctl->data - cnf->data; |
1461 | ||
1462 | set_bit(i, cnf->state); | |
1463 | ||
9355bbd6 | 1464 | if (cnf == net->ipv4.devconf_dflt) |
c0ce9fb3 | 1465 | devinet_copy_dflt_conf(net, i); |
31be3085 HX |
1466 | } |
1467 | ||
1468 | return ret; | |
1469 | } | |
1470 | ||
1da177e4 | 1471 | static int devinet_sysctl_forward(ctl_table *ctl, int write, |
8d65af78 | 1472 | void __user *buffer, |
1da177e4 LT |
1473 | size_t *lenp, loff_t *ppos) |
1474 | { | |
1475 | int *valp = ctl->data; | |
1476 | int val = *valp; | |
88af182e | 1477 | loff_t pos = *ppos; |
8d65af78 | 1478 | int ret = proc_dointvec(ctl, write, buffer, lenp, ppos); |
1da177e4 LT |
1479 | |
1480 | if (write && *valp != val) { | |
c0ce9fb3 PE |
1481 | struct net *net = ctl->extra2; |
1482 | ||
0187bdfb | 1483 | if (valp != &IPV4_DEVCONF_DFLT(net, FORWARDING)) { |
88af182e EB |
1484 | if (!rtnl_trylock()) { |
1485 | /* Restore the original values before restarting */ | |
1486 | *valp = val; | |
1487 | *ppos = pos; | |
9b8adb5e | 1488 | return restart_syscall(); |
88af182e | 1489 | } |
0187bdfb BH |
1490 | if (valp == &IPV4_DEVCONF_ALL(net, FORWARDING)) { |
1491 | inet_forward_change(net); | |
1492 | } else if (*valp) { | |
1493 | struct ipv4_devconf *cnf = ctl->extra1; | |
1494 | struct in_device *idev = | |
1495 | container_of(cnf, struct in_device, cnf); | |
1496 | dev_disable_lro(idev->dev); | |
1497 | } | |
1498 | rtnl_unlock(); | |
76e6ebfb | 1499 | rt_cache_flush(net, 0); |
0187bdfb | 1500 | } |
1da177e4 LT |
1501 | } |
1502 | ||
1503 | return ret; | |
1504 | } | |
1505 | ||
323e126f DM |
1506 | static int ipv4_doint_and_flush(ctl_table *ctl, int write, |
1507 | void __user *buffer, | |
1508 | size_t *lenp, loff_t *ppos) | |
1da177e4 LT |
1509 | { |
1510 | int *valp = ctl->data; | |
1511 | int val = *valp; | |
8d65af78 | 1512 | int ret = proc_dointvec(ctl, write, buffer, lenp, ppos); |
76e6ebfb | 1513 | struct net *net = ctl->extra2; |
1da177e4 LT |
1514 | |
1515 | if (write && *valp != val) | |
76e6ebfb | 1516 | rt_cache_flush(net, 0); |
1da177e4 LT |
1517 | |
1518 | return ret; | |
1519 | } | |
1520 | ||
f8572d8f | 1521 | #define DEVINET_SYSCTL_ENTRY(attr, name, mval, proc) \ |
42f811b8 | 1522 | { \ |
42f811b8 HX |
1523 | .procname = name, \ |
1524 | .data = ipv4_devconf.data + \ | |
02291680 | 1525 | IPV4_DEVCONF_ ## attr - 1, \ |
42f811b8 HX |
1526 | .maxlen = sizeof(int), \ |
1527 | .mode = mval, \ | |
1528 | .proc_handler = proc, \ | |
31be3085 | 1529 | .extra1 = &ipv4_devconf, \ |
42f811b8 HX |
1530 | } |
1531 | ||
1532 | #define DEVINET_SYSCTL_RW_ENTRY(attr, name) \ | |
f8572d8f | 1533 | DEVINET_SYSCTL_ENTRY(attr, name, 0644, devinet_conf_proc) |
42f811b8 HX |
1534 | |
1535 | #define DEVINET_SYSCTL_RO_ENTRY(attr, name) \ | |
f8572d8f | 1536 | DEVINET_SYSCTL_ENTRY(attr, name, 0444, devinet_conf_proc) |
42f811b8 | 1537 | |
f8572d8f EB |
1538 | #define DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, proc) \ |
1539 | DEVINET_SYSCTL_ENTRY(attr, name, 0644, proc) | |
42f811b8 HX |
1540 | |
1541 | #define DEVINET_SYSCTL_FLUSHING_ENTRY(attr, name) \ | |
f8572d8f | 1542 | DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, ipv4_doint_and_flush) |
42f811b8 | 1543 | |
1da177e4 LT |
1544 | static struct devinet_sysctl_table { |
1545 | struct ctl_table_header *sysctl_header; | |
02291680 | 1546 | struct ctl_table devinet_vars[__IPV4_DEVCONF_MAX]; |
bfada697 | 1547 | char *dev_name; |
1da177e4 LT |
1548 | } devinet_sysctl = { |
1549 | .devinet_vars = { | |
42f811b8 | 1550 | DEVINET_SYSCTL_COMPLEX_ENTRY(FORWARDING, "forwarding", |
f8572d8f | 1551 | devinet_sysctl_forward), |
42f811b8 HX |
1552 | DEVINET_SYSCTL_RO_ENTRY(MC_FORWARDING, "mc_forwarding"), |
1553 | ||
1554 | DEVINET_SYSCTL_RW_ENTRY(ACCEPT_REDIRECTS, "accept_redirects"), | |
1555 | DEVINET_SYSCTL_RW_ENTRY(SECURE_REDIRECTS, "secure_redirects"), | |
1556 | DEVINET_SYSCTL_RW_ENTRY(SHARED_MEDIA, "shared_media"), | |
1557 | DEVINET_SYSCTL_RW_ENTRY(RP_FILTER, "rp_filter"), | |
1558 | DEVINET_SYSCTL_RW_ENTRY(SEND_REDIRECTS, "send_redirects"), | |
1559 | DEVINET_SYSCTL_RW_ENTRY(ACCEPT_SOURCE_ROUTE, | |
1560 | "accept_source_route"), | |
8153a10c | 1561 | DEVINET_SYSCTL_RW_ENTRY(ACCEPT_LOCAL, "accept_local"), |
28f6aeea | 1562 | DEVINET_SYSCTL_RW_ENTRY(SRC_VMARK, "src_valid_mark"), |
42f811b8 HX |
1563 | DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP, "proxy_arp"), |
1564 | DEVINET_SYSCTL_RW_ENTRY(MEDIUM_ID, "medium_id"), | |
1565 | DEVINET_SYSCTL_RW_ENTRY(BOOTP_RELAY, "bootp_relay"), | |
1566 | DEVINET_SYSCTL_RW_ENTRY(LOG_MARTIANS, "log_martians"), | |
1567 | DEVINET_SYSCTL_RW_ENTRY(TAG, "tag"), | |
1568 | DEVINET_SYSCTL_RW_ENTRY(ARPFILTER, "arp_filter"), | |
1569 | DEVINET_SYSCTL_RW_ENTRY(ARP_ANNOUNCE, "arp_announce"), | |
1570 | DEVINET_SYSCTL_RW_ENTRY(ARP_IGNORE, "arp_ignore"), | |
1571 | DEVINET_SYSCTL_RW_ENTRY(ARP_ACCEPT, "arp_accept"), | |
eefef1cf | 1572 | DEVINET_SYSCTL_RW_ENTRY(ARP_NOTIFY, "arp_notify"), |
65324144 | 1573 | DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP_PVLAN, "proxy_arp_pvlan"), |
42f811b8 HX |
1574 | |
1575 | DEVINET_SYSCTL_FLUSHING_ENTRY(NOXFRM, "disable_xfrm"), | |
1576 | DEVINET_SYSCTL_FLUSHING_ENTRY(NOPOLICY, "disable_policy"), | |
1577 | DEVINET_SYSCTL_FLUSHING_ENTRY(FORCE_IGMP_VERSION, | |
1578 | "force_igmp_version"), | |
1579 | DEVINET_SYSCTL_FLUSHING_ENTRY(PROMOTE_SECONDARIES, | |
1580 | "promote_secondaries"), | |
1da177e4 | 1581 | }, |
1da177e4 LT |
1582 | }; |
1583 | ||
ea40b324 | 1584 | static int __devinet_sysctl_register(struct net *net, char *dev_name, |
f8572d8f | 1585 | struct ipv4_devconf *p) |
1da177e4 LT |
1586 | { |
1587 | int i; | |
9fa89642 | 1588 | struct devinet_sysctl_table *t; |
1da177e4 | 1589 | |
bfada697 PE |
1590 | #define DEVINET_CTL_PATH_DEV 3 |
1591 | ||
1592 | struct ctl_path devinet_ctl_path[] = { | |
f8572d8f EB |
1593 | { .procname = "net", }, |
1594 | { .procname = "ipv4", }, | |
1595 | { .procname = "conf", }, | |
bfada697 PE |
1596 | { /* to be set */ }, |
1597 | { }, | |
1598 | }; | |
1599 | ||
9fa89642 | 1600 | t = kmemdup(&devinet_sysctl, sizeof(*t), GFP_KERNEL); |
1da177e4 | 1601 | if (!t) |
9fa89642 PE |
1602 | goto out; |
1603 | ||
1da177e4 LT |
1604 | for (i = 0; i < ARRAY_SIZE(t->devinet_vars) - 1; i++) { |
1605 | t->devinet_vars[i].data += (char *)p - (char *)&ipv4_devconf; | |
31be3085 | 1606 | t->devinet_vars[i].extra1 = p; |
c0ce9fb3 | 1607 | t->devinet_vars[i].extra2 = net; |
1da177e4 LT |
1608 | } |
1609 | ||
e905a9ed YH |
1610 | /* |
1611 | * Make a copy of dev_name, because '.procname' is regarded as const | |
1da177e4 LT |
1612 | * by sysctl and we wouldn't want anyone to change it under our feet |
1613 | * (see SIOCSIFNAME). | |
e905a9ed | 1614 | */ |
bfada697 PE |
1615 | t->dev_name = kstrdup(dev_name, GFP_KERNEL); |
1616 | if (!t->dev_name) | |
9fa89642 | 1617 | goto free; |
1da177e4 | 1618 | |
bfada697 | 1619 | devinet_ctl_path[DEVINET_CTL_PATH_DEV].procname = t->dev_name; |
1da177e4 | 1620 | |
752d14dc | 1621 | t->sysctl_header = register_net_sysctl_table(net, devinet_ctl_path, |
bfada697 | 1622 | t->devinet_vars); |
1da177e4 | 1623 | if (!t->sysctl_header) |
9fa89642 | 1624 | goto free_procname; |
1da177e4 LT |
1625 | |
1626 | p->sysctl = t; | |
ea40b324 | 1627 | return 0; |
1da177e4 | 1628 | |
9fa89642 | 1629 | free_procname: |
bfada697 | 1630 | kfree(t->dev_name); |
9fa89642 | 1631 | free: |
1da177e4 | 1632 | kfree(t); |
9fa89642 | 1633 | out: |
ea40b324 | 1634 | return -ENOBUFS; |
1da177e4 LT |
1635 | } |
1636 | ||
51602b2a PE |
1637 | static void __devinet_sysctl_unregister(struct ipv4_devconf *cnf) |
1638 | { | |
1639 | struct devinet_sysctl_table *t = cnf->sysctl; | |
1640 | ||
1641 | if (t == NULL) | |
1642 | return; | |
1643 | ||
1644 | cnf->sysctl = NULL; | |
1645 | unregister_sysctl_table(t->sysctl_header); | |
1646 | kfree(t->dev_name); | |
1647 | kfree(t); | |
1648 | } | |
1649 | ||
66f27a52 PE |
1650 | static void devinet_sysctl_register(struct in_device *idev) |
1651 | { | |
54716e3b | 1652 | neigh_sysctl_register(idev->dev, idev->arp_parms, "ipv4", NULL); |
c346dca1 | 1653 | __devinet_sysctl_register(dev_net(idev->dev), idev->dev->name, |
f8572d8f | 1654 | &idev->cnf); |
66f27a52 PE |
1655 | } |
1656 | ||
51602b2a | 1657 | static void devinet_sysctl_unregister(struct in_device *idev) |
1da177e4 | 1658 | { |
51602b2a PE |
1659 | __devinet_sysctl_unregister(&idev->cnf); |
1660 | neigh_sysctl_unregister(idev->arp_parms); | |
1da177e4 | 1661 | } |
1da177e4 | 1662 | |
68dd299b PE |
1663 | static struct ctl_table ctl_forward_entry[] = { |
1664 | { | |
68dd299b PE |
1665 | .procname = "ip_forward", |
1666 | .data = &ipv4_devconf.data[ | |
02291680 | 1667 | IPV4_DEVCONF_FORWARDING - 1], |
68dd299b PE |
1668 | .maxlen = sizeof(int), |
1669 | .mode = 0644, | |
1670 | .proc_handler = devinet_sysctl_forward, | |
68dd299b | 1671 | .extra1 = &ipv4_devconf, |
c0ce9fb3 | 1672 | .extra2 = &init_net, |
68dd299b PE |
1673 | }, |
1674 | { }, | |
1675 | }; | |
1676 | ||
752d14dc | 1677 | static __net_initdata struct ctl_path net_ipv4_path[] = { |
f8572d8f EB |
1678 | { .procname = "net", }, |
1679 | { .procname = "ipv4", }, | |
68dd299b PE |
1680 | { }, |
1681 | }; | |
2a75de0c | 1682 | #endif |
68dd299b | 1683 | |
752d14dc PE |
1684 | static __net_init int devinet_init_net(struct net *net) |
1685 | { | |
1686 | int err; | |
752d14dc | 1687 | struct ipv4_devconf *all, *dflt; |
2a75de0c ED |
1688 | #ifdef CONFIG_SYSCTL |
1689 | struct ctl_table *tbl = ctl_forward_entry; | |
752d14dc | 1690 | struct ctl_table_header *forw_hdr; |
2a75de0c | 1691 | #endif |
752d14dc PE |
1692 | |
1693 | err = -ENOMEM; | |
1694 | all = &ipv4_devconf; | |
1695 | dflt = &ipv4_devconf_dflt; | |
752d14dc | 1696 | |
09ad9bc7 | 1697 | if (!net_eq(net, &init_net)) { |
752d14dc PE |
1698 | all = kmemdup(all, sizeof(ipv4_devconf), GFP_KERNEL); |
1699 | if (all == NULL) | |
1700 | goto err_alloc_all; | |
1701 | ||
1702 | dflt = kmemdup(dflt, sizeof(ipv4_devconf_dflt), GFP_KERNEL); | |
1703 | if (dflt == NULL) | |
1704 | goto err_alloc_dflt; | |
1705 | ||
2a75de0c | 1706 | #ifdef CONFIG_SYSCTL |
752d14dc PE |
1707 | tbl = kmemdup(tbl, sizeof(ctl_forward_entry), GFP_KERNEL); |
1708 | if (tbl == NULL) | |
1709 | goto err_alloc_ctl; | |
1710 | ||
02291680 | 1711 | tbl[0].data = &all->data[IPV4_DEVCONF_FORWARDING - 1]; |
752d14dc PE |
1712 | tbl[0].extra1 = all; |
1713 | tbl[0].extra2 = net; | |
2a75de0c | 1714 | #endif |
752d14dc PE |
1715 | } |
1716 | ||
1717 | #ifdef CONFIG_SYSCTL | |
f8572d8f | 1718 | err = __devinet_sysctl_register(net, "all", all); |
752d14dc PE |
1719 | if (err < 0) |
1720 | goto err_reg_all; | |
1721 | ||
f8572d8f | 1722 | err = __devinet_sysctl_register(net, "default", dflt); |
752d14dc PE |
1723 | if (err < 0) |
1724 | goto err_reg_dflt; | |
1725 | ||
1726 | err = -ENOMEM; | |
1727 | forw_hdr = register_net_sysctl_table(net, net_ipv4_path, tbl); | |
1728 | if (forw_hdr == NULL) | |
1729 | goto err_reg_ctl; | |
2a75de0c | 1730 | net->ipv4.forw_hdr = forw_hdr; |
752d14dc PE |
1731 | #endif |
1732 | ||
752d14dc PE |
1733 | net->ipv4.devconf_all = all; |
1734 | net->ipv4.devconf_dflt = dflt; | |
1735 | return 0; | |
1736 | ||
1737 | #ifdef CONFIG_SYSCTL | |
1738 | err_reg_ctl: | |
1739 | __devinet_sysctl_unregister(dflt); | |
1740 | err_reg_dflt: | |
1741 | __devinet_sysctl_unregister(all); | |
1742 | err_reg_all: | |
1743 | if (tbl != ctl_forward_entry) | |
1744 | kfree(tbl); | |
752d14dc | 1745 | err_alloc_ctl: |
2a75de0c | 1746 | #endif |
752d14dc PE |
1747 | if (dflt != &ipv4_devconf_dflt) |
1748 | kfree(dflt); | |
1749 | err_alloc_dflt: | |
1750 | if (all != &ipv4_devconf) | |
1751 | kfree(all); | |
1752 | err_alloc_all: | |
1753 | return err; | |
1754 | } | |
1755 | ||
1756 | static __net_exit void devinet_exit_net(struct net *net) | |
1757 | { | |
2a75de0c | 1758 | #ifdef CONFIG_SYSCTL |
752d14dc PE |
1759 | struct ctl_table *tbl; |
1760 | ||
1761 | tbl = net->ipv4.forw_hdr->ctl_table_arg; | |
752d14dc PE |
1762 | unregister_net_sysctl_table(net->ipv4.forw_hdr); |
1763 | __devinet_sysctl_unregister(net->ipv4.devconf_dflt); | |
1764 | __devinet_sysctl_unregister(net->ipv4.devconf_all); | |
752d14dc | 1765 | kfree(tbl); |
2a75de0c | 1766 | #endif |
752d14dc PE |
1767 | kfree(net->ipv4.devconf_dflt); |
1768 | kfree(net->ipv4.devconf_all); | |
1769 | } | |
1770 | ||
1771 | static __net_initdata struct pernet_operations devinet_ops = { | |
1772 | .init = devinet_init_net, | |
1773 | .exit = devinet_exit_net, | |
1774 | }; | |
1775 | ||
9f0f7272 TG |
1776 | static struct rtnl_af_ops inet_af_ops = { |
1777 | .family = AF_INET, | |
1778 | .fill_link_af = inet_fill_link_af, | |
1779 | .get_link_af_size = inet_get_link_af_size, | |
cf7afbfe TG |
1780 | .validate_link_af = inet_validate_link_af, |
1781 | .set_link_af = inet_set_link_af, | |
9f0f7272 TG |
1782 | }; |
1783 | ||
1da177e4 LT |
1784 | void __init devinet_init(void) |
1785 | { | |
fd23c3b3 DM |
1786 | int i; |
1787 | ||
1788 | for (i = 0; i < IN4_ADDR_HSIZE; i++) | |
1789 | INIT_HLIST_HEAD(&inet_addr_lst[i]); | |
1790 | ||
752d14dc PE |
1791 | register_pernet_subsys(&devinet_ops); |
1792 | ||
1da177e4 LT |
1793 | register_gifconf(PF_INET, inet_gifconf); |
1794 | register_netdevice_notifier(&ip_netdev_notifier); | |
63f3444f | 1795 | |
9f0f7272 TG |
1796 | rtnl_af_register(&inet_af_ops); |
1797 | ||
63f3444f TG |
1798 | rtnl_register(PF_INET, RTM_NEWADDR, inet_rtm_newaddr, NULL); |
1799 | rtnl_register(PF_INET, RTM_DELADDR, inet_rtm_deladdr, NULL); | |
1800 | rtnl_register(PF_INET, RTM_GETADDR, NULL, inet_dump_ifaddr); | |
1da177e4 LT |
1801 | } |
1802 |