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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 | 219 | #ifdef NET_REFCNT_DEBUG |
91df42be | 220 | pr_debug("%s: %p=%s\n", __func__, idev, dev ? dev->name : "NIL"); |
1da177e4 LT |
221 | #endif |
222 | dev_put(dev); | |
223 | if (!idev->dead) | |
9f9354b9 ED |
224 | pr_err("Freeing alive in_device %p\n", idev); |
225 | else | |
1da177e4 | 226 | kfree(idev); |
1da177e4 | 227 | } |
9f9354b9 | 228 | EXPORT_SYMBOL(in_dev_finish_destroy); |
1da177e4 | 229 | |
71e27da9 | 230 | static struct in_device *inetdev_init(struct net_device *dev) |
1da177e4 LT |
231 | { |
232 | struct in_device *in_dev; | |
233 | ||
234 | ASSERT_RTNL(); | |
235 | ||
0da974f4 | 236 | in_dev = kzalloc(sizeof(*in_dev), GFP_KERNEL); |
1da177e4 LT |
237 | if (!in_dev) |
238 | goto out; | |
c346dca1 | 239 | memcpy(&in_dev->cnf, dev_net(dev)->ipv4.devconf_dflt, |
9355bbd6 | 240 | sizeof(in_dev->cnf)); |
1da177e4 LT |
241 | in_dev->cnf.sysctl = NULL; |
242 | in_dev->dev = dev; | |
9f9354b9 ED |
243 | in_dev->arp_parms = neigh_parms_alloc(dev, &arp_tbl); |
244 | if (!in_dev->arp_parms) | |
1da177e4 | 245 | goto out_kfree; |
0187bdfb BH |
246 | if (IPV4_DEVCONF(in_dev->cnf, FORWARDING)) |
247 | dev_disable_lro(dev); | |
1da177e4 LT |
248 | /* Reference in_dev->dev */ |
249 | dev_hold(dev); | |
30c4cf57 | 250 | /* Account for reference dev->ip_ptr (below) */ |
1da177e4 | 251 | in_dev_hold(in_dev); |
1da177e4 | 252 | |
66f27a52 | 253 | devinet_sysctl_register(in_dev); |
1da177e4 LT |
254 | ip_mc_init_dev(in_dev); |
255 | if (dev->flags & IFF_UP) | |
256 | ip_mc_up(in_dev); | |
483479ec | 257 | |
30c4cf57 | 258 | /* we can receive as soon as ip_ptr is set -- do this last */ |
cf778b00 | 259 | rcu_assign_pointer(dev->ip_ptr, in_dev); |
483479ec | 260 | out: |
1da177e4 LT |
261 | return in_dev; |
262 | out_kfree: | |
263 | kfree(in_dev); | |
264 | in_dev = NULL; | |
265 | goto out; | |
266 | } | |
267 | ||
268 | static void in_dev_rcu_put(struct rcu_head *head) | |
269 | { | |
270 | struct in_device *idev = container_of(head, struct in_device, rcu_head); | |
271 | in_dev_put(idev); | |
272 | } | |
273 | ||
274 | static void inetdev_destroy(struct in_device *in_dev) | |
275 | { | |
276 | struct in_ifaddr *ifa; | |
277 | struct net_device *dev; | |
278 | ||
279 | ASSERT_RTNL(); | |
280 | ||
281 | dev = in_dev->dev; | |
1da177e4 LT |
282 | |
283 | in_dev->dead = 1; | |
284 | ||
285 | ip_mc_destroy_dev(in_dev); | |
286 | ||
287 | while ((ifa = in_dev->ifa_list) != NULL) { | |
288 | inet_del_ifa(in_dev, &in_dev->ifa_list, 0); | |
289 | inet_free_ifa(ifa); | |
290 | } | |
291 | ||
a9b3cd7f | 292 | RCU_INIT_POINTER(dev->ip_ptr, NULL); |
1da177e4 | 293 | |
51602b2a | 294 | devinet_sysctl_unregister(in_dev); |
1da177e4 LT |
295 | neigh_parms_release(&arp_tbl, in_dev->arp_parms); |
296 | arp_ifdown(dev); | |
297 | ||
298 | call_rcu(&in_dev->rcu_head, in_dev_rcu_put); | |
299 | } | |
300 | ||
ff428d72 | 301 | int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b) |
1da177e4 LT |
302 | { |
303 | rcu_read_lock(); | |
304 | for_primary_ifa(in_dev) { | |
305 | if (inet_ifa_match(a, ifa)) { | |
306 | if (!b || inet_ifa_match(b, ifa)) { | |
307 | rcu_read_unlock(); | |
308 | return 1; | |
309 | } | |
310 | } | |
311 | } endfor_ifa(in_dev); | |
312 | rcu_read_unlock(); | |
313 | return 0; | |
314 | } | |
315 | ||
d6062cbb TG |
316 | static void __inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap, |
317 | int destroy, struct nlmsghdr *nlh, u32 pid) | |
1da177e4 | 318 | { |
8f937c60 | 319 | struct in_ifaddr *promote = NULL; |
0ff60a45 JHS |
320 | struct in_ifaddr *ifa, *ifa1 = *ifap; |
321 | struct in_ifaddr *last_prim = in_dev->ifa_list; | |
322 | struct in_ifaddr *prev_prom = NULL; | |
323 | int do_promote = IN_DEV_PROMOTE_SECONDARIES(in_dev); | |
1da177e4 LT |
324 | |
325 | ASSERT_RTNL(); | |
326 | ||
e905a9ed | 327 | /* 1. Deleting primary ifaddr forces deletion all secondaries |
8f937c60 HW |
328 | * unless alias promotion is set |
329 | **/ | |
1da177e4 LT |
330 | |
331 | if (!(ifa1->ifa_flags & IFA_F_SECONDARY)) { | |
1da177e4 LT |
332 | struct in_ifaddr **ifap1 = &ifa1->ifa_next; |
333 | ||
334 | while ((ifa = *ifap1) != NULL) { | |
e905a9ed | 335 | if (!(ifa->ifa_flags & IFA_F_SECONDARY) && |
0ff60a45 JHS |
336 | ifa1->ifa_scope <= ifa->ifa_scope) |
337 | last_prim = ifa; | |
338 | ||
1da177e4 LT |
339 | if (!(ifa->ifa_flags & IFA_F_SECONDARY) || |
340 | ifa1->ifa_mask != ifa->ifa_mask || | |
341 | !inet_ifa_match(ifa1->ifa_address, ifa)) { | |
342 | ifap1 = &ifa->ifa_next; | |
0ff60a45 | 343 | prev_prom = ifa; |
1da177e4 LT |
344 | continue; |
345 | } | |
346 | ||
0ff60a45 | 347 | if (!do_promote) { |
fd23c3b3 | 348 | inet_hash_remove(ifa); |
8f937c60 | 349 | *ifap1 = ifa->ifa_next; |
1da177e4 | 350 | |
d6062cbb | 351 | rtmsg_ifa(RTM_DELADDR, ifa, nlh, pid); |
e041c683 AS |
352 | blocking_notifier_call_chain(&inetaddr_chain, |
353 | NETDEV_DOWN, ifa); | |
8f937c60 HW |
354 | inet_free_ifa(ifa); |
355 | } else { | |
356 | promote = ifa; | |
357 | break; | |
358 | } | |
1da177e4 LT |
359 | } |
360 | } | |
361 | ||
2d230e2b JA |
362 | /* On promotion all secondaries from subnet are changing |
363 | * the primary IP, we must remove all their routes silently | |
364 | * and later to add them back with new prefsrc. Do this | |
365 | * while all addresses are on the device list. | |
366 | */ | |
367 | for (ifa = promote; ifa; ifa = ifa->ifa_next) { | |
368 | if (ifa1->ifa_mask == ifa->ifa_mask && | |
369 | inet_ifa_match(ifa1->ifa_address, ifa)) | |
370 | fib_del_ifaddr(ifa, ifa1); | |
371 | } | |
372 | ||
1da177e4 LT |
373 | /* 2. Unlink it */ |
374 | ||
375 | *ifap = ifa1->ifa_next; | |
fd23c3b3 | 376 | inet_hash_remove(ifa1); |
1da177e4 LT |
377 | |
378 | /* 3. Announce address deletion */ | |
379 | ||
380 | /* Send message first, then call notifier. | |
381 | At first sight, FIB update triggered by notifier | |
382 | will refer to already deleted ifaddr, that could confuse | |
383 | netlink listeners. It is not true: look, gated sees | |
384 | that route deleted and if it still thinks that ifaddr | |
385 | is valid, it will try to restore deleted routes... Grr. | |
386 | So that, this order is correct. | |
387 | */ | |
d6062cbb | 388 | rtmsg_ifa(RTM_DELADDR, ifa1, nlh, pid); |
e041c683 | 389 | blocking_notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa1); |
1da177e4 | 390 | |
0ff60a45 | 391 | if (promote) { |
04024b93 | 392 | struct in_ifaddr *next_sec = promote->ifa_next; |
0ff60a45 JHS |
393 | |
394 | if (prev_prom) { | |
395 | prev_prom->ifa_next = promote->ifa_next; | |
396 | promote->ifa_next = last_prim->ifa_next; | |
397 | last_prim->ifa_next = promote; | |
398 | } | |
8f937c60 | 399 | |
8f937c60 | 400 | promote->ifa_flags &= ~IFA_F_SECONDARY; |
d6062cbb | 401 | rtmsg_ifa(RTM_NEWADDR, promote, nlh, pid); |
e041c683 AS |
402 | blocking_notifier_call_chain(&inetaddr_chain, |
403 | NETDEV_UP, promote); | |
04024b93 | 404 | for (ifa = next_sec; ifa; ifa = ifa->ifa_next) { |
0ff60a45 JHS |
405 | if (ifa1->ifa_mask != ifa->ifa_mask || |
406 | !inet_ifa_match(ifa1->ifa_address, ifa)) | |
407 | continue; | |
408 | fib_add_ifaddr(ifa); | |
409 | } | |
410 | ||
411 | } | |
6363097c | 412 | if (destroy) |
0ff60a45 | 413 | inet_free_ifa(ifa1); |
1da177e4 LT |
414 | } |
415 | ||
d6062cbb TG |
416 | static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap, |
417 | int destroy) | |
418 | { | |
419 | __inet_del_ifa(in_dev, ifap, destroy, NULL, 0); | |
420 | } | |
421 | ||
422 | static int __inet_insert_ifa(struct in_ifaddr *ifa, struct nlmsghdr *nlh, | |
423 | u32 pid) | |
1da177e4 LT |
424 | { |
425 | struct in_device *in_dev = ifa->ifa_dev; | |
426 | struct in_ifaddr *ifa1, **ifap, **last_primary; | |
427 | ||
428 | ASSERT_RTNL(); | |
429 | ||
430 | if (!ifa->ifa_local) { | |
431 | inet_free_ifa(ifa); | |
432 | return 0; | |
433 | } | |
434 | ||
435 | ifa->ifa_flags &= ~IFA_F_SECONDARY; | |
436 | last_primary = &in_dev->ifa_list; | |
437 | ||
438 | for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL; | |
439 | ifap = &ifa1->ifa_next) { | |
440 | if (!(ifa1->ifa_flags & IFA_F_SECONDARY) && | |
441 | ifa->ifa_scope <= ifa1->ifa_scope) | |
442 | last_primary = &ifa1->ifa_next; | |
443 | if (ifa1->ifa_mask == ifa->ifa_mask && | |
444 | inet_ifa_match(ifa1->ifa_address, ifa)) { | |
445 | if (ifa1->ifa_local == ifa->ifa_local) { | |
446 | inet_free_ifa(ifa); | |
447 | return -EEXIST; | |
448 | } | |
449 | if (ifa1->ifa_scope != ifa->ifa_scope) { | |
450 | inet_free_ifa(ifa); | |
451 | return -EINVAL; | |
452 | } | |
453 | ifa->ifa_flags |= IFA_F_SECONDARY; | |
454 | } | |
455 | } | |
456 | ||
457 | if (!(ifa->ifa_flags & IFA_F_SECONDARY)) { | |
458 | net_srandom(ifa->ifa_local); | |
459 | ifap = last_primary; | |
460 | } | |
461 | ||
462 | ifa->ifa_next = *ifap; | |
463 | *ifap = ifa; | |
464 | ||
fd23c3b3 DM |
465 | inet_hash_insert(dev_net(in_dev->dev), ifa); |
466 | ||
1da177e4 LT |
467 | /* Send message first, then call notifier. |
468 | Notifier will trigger FIB update, so that | |
469 | listeners of netlink will know about new ifaddr */ | |
d6062cbb | 470 | rtmsg_ifa(RTM_NEWADDR, ifa, nlh, pid); |
e041c683 | 471 | blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa); |
1da177e4 LT |
472 | |
473 | return 0; | |
474 | } | |
475 | ||
d6062cbb TG |
476 | static int inet_insert_ifa(struct in_ifaddr *ifa) |
477 | { | |
478 | return __inet_insert_ifa(ifa, NULL, 0); | |
479 | } | |
480 | ||
1da177e4 LT |
481 | static int inet_set_ifa(struct net_device *dev, struct in_ifaddr *ifa) |
482 | { | |
e5ed6399 | 483 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
1da177e4 LT |
484 | |
485 | ASSERT_RTNL(); | |
486 | ||
487 | if (!in_dev) { | |
71e27da9 HX |
488 | inet_free_ifa(ifa); |
489 | return -ENOBUFS; | |
1da177e4 | 490 | } |
71e27da9 | 491 | ipv4_devconf_setall(in_dev); |
1da177e4 | 492 | if (ifa->ifa_dev != in_dev) { |
547b792c | 493 | WARN_ON(ifa->ifa_dev); |
1da177e4 LT |
494 | in_dev_hold(in_dev); |
495 | ifa->ifa_dev = in_dev; | |
496 | } | |
f97c1e0c | 497 | if (ipv4_is_loopback(ifa->ifa_local)) |
1da177e4 LT |
498 | ifa->ifa_scope = RT_SCOPE_HOST; |
499 | return inet_insert_ifa(ifa); | |
500 | } | |
501 | ||
8723e1b4 ED |
502 | /* Caller must hold RCU or RTNL : |
503 | * We dont take a reference on found in_device | |
504 | */ | |
7fee0ca2 | 505 | struct in_device *inetdev_by_index(struct net *net, int ifindex) |
1da177e4 LT |
506 | { |
507 | struct net_device *dev; | |
508 | struct in_device *in_dev = NULL; | |
c148fc2e ED |
509 | |
510 | rcu_read_lock(); | |
511 | dev = dev_get_by_index_rcu(net, ifindex); | |
1da177e4 | 512 | if (dev) |
8723e1b4 | 513 | in_dev = rcu_dereference_rtnl(dev->ip_ptr); |
c148fc2e | 514 | rcu_read_unlock(); |
1da177e4 LT |
515 | return in_dev; |
516 | } | |
9f9354b9 | 517 | EXPORT_SYMBOL(inetdev_by_index); |
1da177e4 LT |
518 | |
519 | /* Called only from RTNL semaphored context. No locks. */ | |
520 | ||
60cad5da AV |
521 | struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix, |
522 | __be32 mask) | |
1da177e4 LT |
523 | { |
524 | ASSERT_RTNL(); | |
525 | ||
526 | for_primary_ifa(in_dev) { | |
527 | if (ifa->ifa_mask == mask && inet_ifa_match(prefix, ifa)) | |
528 | return ifa; | |
529 | } endfor_ifa(in_dev); | |
530 | return NULL; | |
531 | } | |
532 | ||
533 | static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) | |
534 | { | |
3b1e0a65 | 535 | struct net *net = sock_net(skb->sk); |
dfdd5fd4 | 536 | struct nlattr *tb[IFA_MAX+1]; |
1da177e4 | 537 | struct in_device *in_dev; |
dfdd5fd4 | 538 | struct ifaddrmsg *ifm; |
1da177e4 | 539 | struct in_ifaddr *ifa, **ifap; |
dfdd5fd4 | 540 | int err = -EINVAL; |
1da177e4 LT |
541 | |
542 | ASSERT_RTNL(); | |
543 | ||
dfdd5fd4 TG |
544 | err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy); |
545 | if (err < 0) | |
546 | goto errout; | |
547 | ||
548 | ifm = nlmsg_data(nlh); | |
7fee0ca2 | 549 | in_dev = inetdev_by_index(net, ifm->ifa_index); |
dfdd5fd4 TG |
550 | if (in_dev == NULL) { |
551 | err = -ENODEV; | |
552 | goto errout; | |
553 | } | |
554 | ||
1da177e4 LT |
555 | for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; |
556 | ifap = &ifa->ifa_next) { | |
dfdd5fd4 | 557 | if (tb[IFA_LOCAL] && |
a7a628c4 | 558 | ifa->ifa_local != nla_get_be32(tb[IFA_LOCAL])) |
dfdd5fd4 TG |
559 | continue; |
560 | ||
561 | if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label)) | |
1da177e4 | 562 | continue; |
dfdd5fd4 TG |
563 | |
564 | if (tb[IFA_ADDRESS] && | |
565 | (ifm->ifa_prefixlen != ifa->ifa_prefixlen || | |
a7a628c4 | 566 | !inet_ifa_match(nla_get_be32(tb[IFA_ADDRESS]), ifa))) |
dfdd5fd4 TG |
567 | continue; |
568 | ||
d6062cbb | 569 | __inet_del_ifa(in_dev, ifap, 1, nlh, NETLINK_CB(skb).pid); |
1da177e4 LT |
570 | return 0; |
571 | } | |
dfdd5fd4 TG |
572 | |
573 | err = -EADDRNOTAVAIL; | |
574 | errout: | |
575 | return err; | |
1da177e4 LT |
576 | } |
577 | ||
4b8aa9ab | 578 | static struct in_ifaddr *rtm_to_ifaddr(struct net *net, struct nlmsghdr *nlh) |
1da177e4 | 579 | { |
5c753978 TG |
580 | struct nlattr *tb[IFA_MAX+1]; |
581 | struct in_ifaddr *ifa; | |
582 | struct ifaddrmsg *ifm; | |
1da177e4 LT |
583 | struct net_device *dev; |
584 | struct in_device *in_dev; | |
7b218574 | 585 | int err; |
1da177e4 | 586 | |
5c753978 TG |
587 | err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy); |
588 | if (err < 0) | |
589 | goto errout; | |
1da177e4 | 590 | |
5c753978 | 591 | ifm = nlmsg_data(nlh); |
7b218574 DL |
592 | err = -EINVAL; |
593 | if (ifm->ifa_prefixlen > 32 || tb[IFA_LOCAL] == NULL) | |
5c753978 | 594 | goto errout; |
1da177e4 | 595 | |
4b8aa9ab | 596 | dev = __dev_get_by_index(net, ifm->ifa_index); |
7b218574 DL |
597 | err = -ENODEV; |
598 | if (dev == NULL) | |
5c753978 | 599 | goto errout; |
1da177e4 | 600 | |
5c753978 | 601 | in_dev = __in_dev_get_rtnl(dev); |
7b218574 DL |
602 | err = -ENOBUFS; |
603 | if (in_dev == NULL) | |
71e27da9 | 604 | goto errout; |
1da177e4 | 605 | |
5c753978 | 606 | ifa = inet_alloc_ifa(); |
7b218574 | 607 | if (ifa == NULL) |
5c753978 TG |
608 | /* |
609 | * A potential indev allocation can be left alive, it stays | |
610 | * assigned to its device and is destroy with it. | |
611 | */ | |
5c753978 | 612 | goto errout; |
5c753978 | 613 | |
a4e65d36 | 614 | ipv4_devconf_setall(in_dev); |
5c753978 TG |
615 | in_dev_hold(in_dev); |
616 | ||
617 | if (tb[IFA_ADDRESS] == NULL) | |
618 | tb[IFA_ADDRESS] = tb[IFA_LOCAL]; | |
1da177e4 | 619 | |
fd23c3b3 | 620 | INIT_HLIST_NODE(&ifa->hash); |
1da177e4 LT |
621 | ifa->ifa_prefixlen = ifm->ifa_prefixlen; |
622 | ifa->ifa_mask = inet_make_mask(ifm->ifa_prefixlen); | |
1da177e4 LT |
623 | ifa->ifa_flags = ifm->ifa_flags; |
624 | ifa->ifa_scope = ifm->ifa_scope; | |
5c753978 TG |
625 | ifa->ifa_dev = in_dev; |
626 | ||
a7a628c4 AV |
627 | ifa->ifa_local = nla_get_be32(tb[IFA_LOCAL]); |
628 | ifa->ifa_address = nla_get_be32(tb[IFA_ADDRESS]); | |
5c753978 TG |
629 | |
630 | if (tb[IFA_BROADCAST]) | |
a7a628c4 | 631 | ifa->ifa_broadcast = nla_get_be32(tb[IFA_BROADCAST]); |
5c753978 | 632 | |
5c753978 TG |
633 | if (tb[IFA_LABEL]) |
634 | nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ); | |
1da177e4 LT |
635 | else |
636 | memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); | |
637 | ||
5c753978 TG |
638 | return ifa; |
639 | ||
640 | errout: | |
641 | return ERR_PTR(err); | |
642 | } | |
643 | ||
644 | static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) | |
645 | { | |
3b1e0a65 | 646 | struct net *net = sock_net(skb->sk); |
5c753978 TG |
647 | struct in_ifaddr *ifa; |
648 | ||
649 | ASSERT_RTNL(); | |
650 | ||
4b8aa9ab | 651 | ifa = rtm_to_ifaddr(net, nlh); |
5c753978 TG |
652 | if (IS_ERR(ifa)) |
653 | return PTR_ERR(ifa); | |
654 | ||
d6062cbb | 655 | return __inet_insert_ifa(ifa, nlh, NETLINK_CB(skb).pid); |
1da177e4 LT |
656 | } |
657 | ||
658 | /* | |
659 | * Determine a default network mask, based on the IP address. | |
660 | */ | |
661 | ||
9f9354b9 | 662 | static inline int inet_abc_len(__be32 addr) |
1da177e4 LT |
663 | { |
664 | int rc = -1; /* Something else, probably a multicast. */ | |
665 | ||
f97c1e0c | 666 | if (ipv4_is_zeronet(addr)) |
e905a9ed | 667 | rc = 0; |
1da177e4 | 668 | else { |
714e85be | 669 | __u32 haddr = ntohl(addr); |
1da177e4 | 670 | |
714e85be | 671 | if (IN_CLASSA(haddr)) |
1da177e4 | 672 | rc = 8; |
714e85be | 673 | else if (IN_CLASSB(haddr)) |
1da177e4 | 674 | rc = 16; |
714e85be | 675 | else if (IN_CLASSC(haddr)) |
1da177e4 LT |
676 | rc = 24; |
677 | } | |
678 | ||
e905a9ed | 679 | return rc; |
1da177e4 LT |
680 | } |
681 | ||
682 | ||
e5b13cb1 | 683 | int devinet_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
1da177e4 LT |
684 | { |
685 | struct ifreq ifr; | |
686 | struct sockaddr_in sin_orig; | |
687 | struct sockaddr_in *sin = (struct sockaddr_in *)&ifr.ifr_addr; | |
688 | struct in_device *in_dev; | |
689 | struct in_ifaddr **ifap = NULL; | |
690 | struct in_ifaddr *ifa = NULL; | |
691 | struct net_device *dev; | |
692 | char *colon; | |
693 | int ret = -EFAULT; | |
694 | int tryaddrmatch = 0; | |
695 | ||
696 | /* | |
697 | * Fetch the caller's info block into kernel space | |
698 | */ | |
699 | ||
700 | if (copy_from_user(&ifr, arg, sizeof(struct ifreq))) | |
701 | goto out; | |
702 | ifr.ifr_name[IFNAMSIZ - 1] = 0; | |
703 | ||
704 | /* save original address for comparison */ | |
705 | memcpy(&sin_orig, sin, sizeof(*sin)); | |
706 | ||
707 | colon = strchr(ifr.ifr_name, ':'); | |
708 | if (colon) | |
709 | *colon = 0; | |
710 | ||
e5b13cb1 | 711 | dev_load(net, ifr.ifr_name); |
1da177e4 | 712 | |
132adf54 | 713 | switch (cmd) { |
1da177e4 LT |
714 | case SIOCGIFADDR: /* Get interface address */ |
715 | case SIOCGIFBRDADDR: /* Get the broadcast address */ | |
716 | case SIOCGIFDSTADDR: /* Get the destination address */ | |
717 | case SIOCGIFNETMASK: /* Get the netmask for the interface */ | |
718 | /* Note that these ioctls will not sleep, | |
719 | so that we do not impose a lock. | |
720 | One day we will be forced to put shlock here (I mean SMP) | |
721 | */ | |
722 | tryaddrmatch = (sin_orig.sin_family == AF_INET); | |
723 | memset(sin, 0, sizeof(*sin)); | |
724 | sin->sin_family = AF_INET; | |
725 | break; | |
726 | ||
727 | case SIOCSIFFLAGS: | |
728 | ret = -EACCES; | |
729 | if (!capable(CAP_NET_ADMIN)) | |
730 | goto out; | |
731 | break; | |
732 | case SIOCSIFADDR: /* Set interface address (and family) */ | |
733 | case SIOCSIFBRDADDR: /* Set the broadcast address */ | |
734 | case SIOCSIFDSTADDR: /* Set the destination address */ | |
735 | case SIOCSIFNETMASK: /* Set the netmask for the interface */ | |
736 | ret = -EACCES; | |
737 | if (!capable(CAP_NET_ADMIN)) | |
738 | goto out; | |
739 | ret = -EINVAL; | |
740 | if (sin->sin_family != AF_INET) | |
741 | goto out; | |
742 | break; | |
743 | default: | |
744 | ret = -EINVAL; | |
745 | goto out; | |
746 | } | |
747 | ||
748 | rtnl_lock(); | |
749 | ||
750 | ret = -ENODEV; | |
9f9354b9 ED |
751 | dev = __dev_get_by_name(net, ifr.ifr_name); |
752 | if (!dev) | |
1da177e4 LT |
753 | goto done; |
754 | ||
755 | if (colon) | |
756 | *colon = ':'; | |
757 | ||
9f9354b9 ED |
758 | in_dev = __in_dev_get_rtnl(dev); |
759 | if (in_dev) { | |
1da177e4 LT |
760 | if (tryaddrmatch) { |
761 | /* Matthias Andree */ | |
762 | /* compare label and address (4.4BSD style) */ | |
763 | /* note: we only do this for a limited set of ioctls | |
764 | and only if the original address family was AF_INET. | |
765 | This is checked above. */ | |
766 | for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; | |
767 | ifap = &ifa->ifa_next) { | |
768 | if (!strcmp(ifr.ifr_name, ifa->ifa_label) && | |
769 | sin_orig.sin_addr.s_addr == | |
6c91afe1 | 770 | ifa->ifa_local) { |
1da177e4 LT |
771 | break; /* found */ |
772 | } | |
773 | } | |
774 | } | |
775 | /* we didn't get a match, maybe the application is | |
776 | 4.3BSD-style and passed in junk so we fall back to | |
777 | comparing just the label */ | |
778 | if (!ifa) { | |
779 | for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; | |
780 | ifap = &ifa->ifa_next) | |
781 | if (!strcmp(ifr.ifr_name, ifa->ifa_label)) | |
782 | break; | |
783 | } | |
784 | } | |
785 | ||
786 | ret = -EADDRNOTAVAIL; | |
787 | if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS) | |
788 | goto done; | |
789 | ||
132adf54 | 790 | switch (cmd) { |
1da177e4 LT |
791 | case SIOCGIFADDR: /* Get interface address */ |
792 | sin->sin_addr.s_addr = ifa->ifa_local; | |
793 | goto rarok; | |
794 | ||
795 | case SIOCGIFBRDADDR: /* Get the broadcast address */ | |
796 | sin->sin_addr.s_addr = ifa->ifa_broadcast; | |
797 | goto rarok; | |
798 | ||
799 | case SIOCGIFDSTADDR: /* Get the destination address */ | |
800 | sin->sin_addr.s_addr = ifa->ifa_address; | |
801 | goto rarok; | |
802 | ||
803 | case SIOCGIFNETMASK: /* Get the netmask for the interface */ | |
804 | sin->sin_addr.s_addr = ifa->ifa_mask; | |
805 | goto rarok; | |
806 | ||
807 | case SIOCSIFFLAGS: | |
808 | if (colon) { | |
809 | ret = -EADDRNOTAVAIL; | |
810 | if (!ifa) | |
811 | break; | |
812 | ret = 0; | |
813 | if (!(ifr.ifr_flags & IFF_UP)) | |
814 | inet_del_ifa(in_dev, ifap, 1); | |
815 | break; | |
816 | } | |
817 | ret = dev_change_flags(dev, ifr.ifr_flags); | |
818 | break; | |
819 | ||
820 | case SIOCSIFADDR: /* Set interface address (and family) */ | |
821 | ret = -EINVAL; | |
822 | if (inet_abc_len(sin->sin_addr.s_addr) < 0) | |
823 | break; | |
824 | ||
825 | if (!ifa) { | |
826 | ret = -ENOBUFS; | |
9f9354b9 | 827 | ifa = inet_alloc_ifa(); |
fd23c3b3 | 828 | INIT_HLIST_NODE(&ifa->hash); |
9f9354b9 | 829 | if (!ifa) |
1da177e4 LT |
830 | break; |
831 | if (colon) | |
832 | memcpy(ifa->ifa_label, ifr.ifr_name, IFNAMSIZ); | |
833 | else | |
834 | memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); | |
835 | } else { | |
836 | ret = 0; | |
837 | if (ifa->ifa_local == sin->sin_addr.s_addr) | |
838 | break; | |
839 | inet_del_ifa(in_dev, ifap, 0); | |
840 | ifa->ifa_broadcast = 0; | |
148f9729 | 841 | ifa->ifa_scope = 0; |
1da177e4 LT |
842 | } |
843 | ||
844 | ifa->ifa_address = ifa->ifa_local = sin->sin_addr.s_addr; | |
845 | ||
846 | if (!(dev->flags & IFF_POINTOPOINT)) { | |
847 | ifa->ifa_prefixlen = inet_abc_len(ifa->ifa_address); | |
848 | ifa->ifa_mask = inet_make_mask(ifa->ifa_prefixlen); | |
849 | if ((dev->flags & IFF_BROADCAST) && | |
850 | ifa->ifa_prefixlen < 31) | |
851 | ifa->ifa_broadcast = ifa->ifa_address | | |
852 | ~ifa->ifa_mask; | |
853 | } else { | |
854 | ifa->ifa_prefixlen = 32; | |
855 | ifa->ifa_mask = inet_make_mask(32); | |
856 | } | |
857 | ret = inet_set_ifa(dev, ifa); | |
858 | break; | |
859 | ||
860 | case SIOCSIFBRDADDR: /* Set the broadcast address */ | |
861 | ret = 0; | |
862 | if (ifa->ifa_broadcast != sin->sin_addr.s_addr) { | |
863 | inet_del_ifa(in_dev, ifap, 0); | |
864 | ifa->ifa_broadcast = sin->sin_addr.s_addr; | |
865 | inet_insert_ifa(ifa); | |
866 | } | |
867 | break; | |
868 | ||
869 | case SIOCSIFDSTADDR: /* Set the destination address */ | |
870 | ret = 0; | |
871 | if (ifa->ifa_address == sin->sin_addr.s_addr) | |
872 | break; | |
873 | ret = -EINVAL; | |
874 | if (inet_abc_len(sin->sin_addr.s_addr) < 0) | |
875 | break; | |
876 | ret = 0; | |
877 | inet_del_ifa(in_dev, ifap, 0); | |
878 | ifa->ifa_address = sin->sin_addr.s_addr; | |
879 | inet_insert_ifa(ifa); | |
880 | break; | |
881 | ||
882 | case SIOCSIFNETMASK: /* Set the netmask for the interface */ | |
883 | ||
884 | /* | |
885 | * The mask we set must be legal. | |
886 | */ | |
887 | ret = -EINVAL; | |
888 | if (bad_mask(sin->sin_addr.s_addr, 0)) | |
889 | break; | |
890 | ret = 0; | |
891 | if (ifa->ifa_mask != sin->sin_addr.s_addr) { | |
a144ea4b | 892 | __be32 old_mask = ifa->ifa_mask; |
1da177e4 LT |
893 | inet_del_ifa(in_dev, ifap, 0); |
894 | ifa->ifa_mask = sin->sin_addr.s_addr; | |
895 | ifa->ifa_prefixlen = inet_mask_len(ifa->ifa_mask); | |
896 | ||
897 | /* See if current broadcast address matches | |
898 | * with current netmask, then recalculate | |
899 | * the broadcast address. Otherwise it's a | |
900 | * funny address, so don't touch it since | |
901 | * the user seems to know what (s)he's doing... | |
902 | */ | |
903 | if ((dev->flags & IFF_BROADCAST) && | |
904 | (ifa->ifa_prefixlen < 31) && | |
905 | (ifa->ifa_broadcast == | |
dcab5e1e | 906 | (ifa->ifa_local|~old_mask))) { |
1da177e4 LT |
907 | ifa->ifa_broadcast = (ifa->ifa_local | |
908 | ~sin->sin_addr.s_addr); | |
909 | } | |
910 | inet_insert_ifa(ifa); | |
911 | } | |
912 | break; | |
913 | } | |
914 | done: | |
915 | rtnl_unlock(); | |
916 | out: | |
917 | return ret; | |
918 | rarok: | |
919 | rtnl_unlock(); | |
920 | ret = copy_to_user(arg, &ifr, sizeof(struct ifreq)) ? -EFAULT : 0; | |
921 | goto out; | |
922 | } | |
923 | ||
924 | static int inet_gifconf(struct net_device *dev, char __user *buf, int len) | |
925 | { | |
e5ed6399 | 926 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
1da177e4 LT |
927 | struct in_ifaddr *ifa; |
928 | struct ifreq ifr; | |
929 | int done = 0; | |
930 | ||
9f9354b9 | 931 | if (!in_dev) |
1da177e4 LT |
932 | goto out; |
933 | ||
9f9354b9 | 934 | for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { |
1da177e4 LT |
935 | if (!buf) { |
936 | done += sizeof(ifr); | |
937 | continue; | |
938 | } | |
939 | if (len < (int) sizeof(ifr)) | |
940 | break; | |
941 | memset(&ifr, 0, sizeof(struct ifreq)); | |
942 | if (ifa->ifa_label) | |
943 | strcpy(ifr.ifr_name, ifa->ifa_label); | |
944 | else | |
945 | strcpy(ifr.ifr_name, dev->name); | |
946 | ||
947 | (*(struct sockaddr_in *)&ifr.ifr_addr).sin_family = AF_INET; | |
948 | (*(struct sockaddr_in *)&ifr.ifr_addr).sin_addr.s_addr = | |
949 | ifa->ifa_local; | |
950 | ||
951 | if (copy_to_user(buf, &ifr, sizeof(struct ifreq))) { | |
952 | done = -EFAULT; | |
953 | break; | |
954 | } | |
955 | buf += sizeof(struct ifreq); | |
956 | len -= sizeof(struct ifreq); | |
957 | done += sizeof(struct ifreq); | |
958 | } | |
959 | out: | |
960 | return done; | |
961 | } | |
962 | ||
a61ced5d | 963 | __be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope) |
1da177e4 | 964 | { |
a61ced5d | 965 | __be32 addr = 0; |
1da177e4 | 966 | struct in_device *in_dev; |
c346dca1 | 967 | struct net *net = dev_net(dev); |
1da177e4 LT |
968 | |
969 | rcu_read_lock(); | |
e5ed6399 | 970 | in_dev = __in_dev_get_rcu(dev); |
1da177e4 LT |
971 | if (!in_dev) |
972 | goto no_in_dev; | |
973 | ||
974 | for_primary_ifa(in_dev) { | |
975 | if (ifa->ifa_scope > scope) | |
976 | continue; | |
977 | if (!dst || inet_ifa_match(dst, ifa)) { | |
978 | addr = ifa->ifa_local; | |
979 | break; | |
980 | } | |
981 | if (!addr) | |
982 | addr = ifa->ifa_local; | |
983 | } endfor_ifa(in_dev); | |
1da177e4 LT |
984 | |
985 | if (addr) | |
c6d14c84 | 986 | goto out_unlock; |
9f9354b9 | 987 | no_in_dev: |
1da177e4 LT |
988 | |
989 | /* Not loopback addresses on loopback should be preferred | |
990 | in this case. It is importnat that lo is the first interface | |
991 | in dev_base list. | |
992 | */ | |
c6d14c84 | 993 | for_each_netdev_rcu(net, dev) { |
9f9354b9 ED |
994 | in_dev = __in_dev_get_rcu(dev); |
995 | if (!in_dev) | |
1da177e4 LT |
996 | continue; |
997 | ||
998 | for_primary_ifa(in_dev) { | |
999 | if (ifa->ifa_scope != RT_SCOPE_LINK && | |
1000 | ifa->ifa_scope <= scope) { | |
1001 | addr = ifa->ifa_local; | |
c6d14c84 | 1002 | goto out_unlock; |
1da177e4 LT |
1003 | } |
1004 | } endfor_ifa(in_dev); | |
1005 | } | |
c6d14c84 | 1006 | out_unlock: |
1da177e4 | 1007 | rcu_read_unlock(); |
1da177e4 LT |
1008 | return addr; |
1009 | } | |
9f9354b9 | 1010 | EXPORT_SYMBOL(inet_select_addr); |
1da177e4 | 1011 | |
60cad5da AV |
1012 | static __be32 confirm_addr_indev(struct in_device *in_dev, __be32 dst, |
1013 | __be32 local, int scope) | |
1da177e4 LT |
1014 | { |
1015 | int same = 0; | |
a144ea4b | 1016 | __be32 addr = 0; |
1da177e4 LT |
1017 | |
1018 | for_ifa(in_dev) { | |
1019 | if (!addr && | |
1020 | (local == ifa->ifa_local || !local) && | |
1021 | ifa->ifa_scope <= scope) { | |
1022 | addr = ifa->ifa_local; | |
1023 | if (same) | |
1024 | break; | |
1025 | } | |
1026 | if (!same) { | |
1027 | same = (!local || inet_ifa_match(local, ifa)) && | |
1028 | (!dst || inet_ifa_match(dst, ifa)); | |
1029 | if (same && addr) { | |
1030 | if (local || !dst) | |
1031 | break; | |
1032 | /* Is the selected addr into dst subnet? */ | |
1033 | if (inet_ifa_match(addr, ifa)) | |
1034 | break; | |
1035 | /* No, then can we use new local src? */ | |
1036 | if (ifa->ifa_scope <= scope) { | |
1037 | addr = ifa->ifa_local; | |
1038 | break; | |
1039 | } | |
1040 | /* search for large dst subnet for addr */ | |
1041 | same = 0; | |
1042 | } | |
1043 | } | |
1044 | } endfor_ifa(in_dev); | |
1045 | ||
9f9354b9 | 1046 | return same ? addr : 0; |
1da177e4 LT |
1047 | } |
1048 | ||
1049 | /* | |
1050 | * Confirm that local IP address exists using wildcards: | |
9bd85e32 | 1051 | * - in_dev: only on this interface, 0=any interface |
1da177e4 LT |
1052 | * - dst: only in the same subnet as dst, 0=any dst |
1053 | * - local: address, 0=autoselect the local address | |
1054 | * - scope: maximum allowed scope value for the local address | |
1055 | */ | |
9bd85e32 DL |
1056 | __be32 inet_confirm_addr(struct in_device *in_dev, |
1057 | __be32 dst, __be32 local, int scope) | |
1da177e4 | 1058 | { |
60cad5da | 1059 | __be32 addr = 0; |
9bd85e32 | 1060 | struct net_device *dev; |
39a6d063 | 1061 | struct net *net; |
1da177e4 | 1062 | |
39a6d063 | 1063 | if (scope != RT_SCOPE_LINK) |
9bd85e32 | 1064 | return confirm_addr_indev(in_dev, dst, local, scope); |
1da177e4 | 1065 | |
c346dca1 | 1066 | net = dev_net(in_dev->dev); |
1da177e4 | 1067 | rcu_read_lock(); |
c6d14c84 | 1068 | for_each_netdev_rcu(net, dev) { |
9f9354b9 ED |
1069 | in_dev = __in_dev_get_rcu(dev); |
1070 | if (in_dev) { | |
1da177e4 LT |
1071 | addr = confirm_addr_indev(in_dev, dst, local, scope); |
1072 | if (addr) | |
1073 | break; | |
1074 | } | |
1075 | } | |
1076 | rcu_read_unlock(); | |
1da177e4 LT |
1077 | |
1078 | return addr; | |
1079 | } | |
eaddcd76 | 1080 | EXPORT_SYMBOL(inet_confirm_addr); |
1da177e4 LT |
1081 | |
1082 | /* | |
1083 | * Device notifier | |
1084 | */ | |
1085 | ||
1086 | int register_inetaddr_notifier(struct notifier_block *nb) | |
1087 | { | |
e041c683 | 1088 | return blocking_notifier_chain_register(&inetaddr_chain, nb); |
1da177e4 | 1089 | } |
9f9354b9 | 1090 | EXPORT_SYMBOL(register_inetaddr_notifier); |
1da177e4 LT |
1091 | |
1092 | int unregister_inetaddr_notifier(struct notifier_block *nb) | |
1093 | { | |
e041c683 | 1094 | return blocking_notifier_chain_unregister(&inetaddr_chain, nb); |
1da177e4 | 1095 | } |
9f9354b9 | 1096 | EXPORT_SYMBOL(unregister_inetaddr_notifier); |
1da177e4 | 1097 | |
9f9354b9 ED |
1098 | /* Rename ifa_labels for a device name change. Make some effort to preserve |
1099 | * existing alias numbering and to create unique labels if possible. | |
1da177e4 LT |
1100 | */ |
1101 | static void inetdev_changename(struct net_device *dev, struct in_device *in_dev) | |
e905a9ed | 1102 | { |
1da177e4 LT |
1103 | struct in_ifaddr *ifa; |
1104 | int named = 0; | |
1105 | ||
e905a9ed YH |
1106 | for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { |
1107 | char old[IFNAMSIZ], *dot; | |
1da177e4 LT |
1108 | |
1109 | memcpy(old, ifa->ifa_label, IFNAMSIZ); | |
e905a9ed | 1110 | memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); |
1da177e4 | 1111 | if (named++ == 0) |
573bf470 | 1112 | goto skip; |
44344b2a | 1113 | dot = strchr(old, ':'); |
e905a9ed YH |
1114 | if (dot == NULL) { |
1115 | sprintf(old, ":%d", named); | |
1da177e4 LT |
1116 | dot = old; |
1117 | } | |
9f9354b9 | 1118 | if (strlen(dot) + strlen(dev->name) < IFNAMSIZ) |
e905a9ed | 1119 | strcat(ifa->ifa_label, dot); |
9f9354b9 | 1120 | else |
e905a9ed | 1121 | strcpy(ifa->ifa_label + (IFNAMSIZ - strlen(dot) - 1), dot); |
573bf470 TG |
1122 | skip: |
1123 | rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0); | |
e905a9ed YH |
1124 | } |
1125 | } | |
1da177e4 | 1126 | |
95c96174 | 1127 | static inline bool inetdev_valid_mtu(unsigned int mtu) |
06770843 BL |
1128 | { |
1129 | return mtu >= 68; | |
1130 | } | |
1131 | ||
d11327ad IC |
1132 | static void inetdev_send_gratuitous_arp(struct net_device *dev, |
1133 | struct in_device *in_dev) | |
1134 | ||
1135 | { | |
b76d0789 | 1136 | struct in_ifaddr *ifa; |
d11327ad | 1137 | |
b76d0789 ZK |
1138 | for (ifa = in_dev->ifa_list; ifa; |
1139 | ifa = ifa->ifa_next) { | |
1140 | arp_send(ARPOP_REQUEST, ETH_P_ARP, | |
1141 | ifa->ifa_local, dev, | |
1142 | ifa->ifa_local, NULL, | |
1143 | dev->dev_addr, NULL); | |
1144 | } | |
d11327ad IC |
1145 | } |
1146 | ||
1da177e4 LT |
1147 | /* Called only under RTNL semaphore */ |
1148 | ||
1149 | static int inetdev_event(struct notifier_block *this, unsigned long event, | |
1150 | void *ptr) | |
1151 | { | |
1152 | struct net_device *dev = ptr; | |
e5ed6399 | 1153 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
1da177e4 LT |
1154 | |
1155 | ASSERT_RTNL(); | |
1156 | ||
1157 | if (!in_dev) { | |
8030f544 | 1158 | if (event == NETDEV_REGISTER) { |
1da177e4 | 1159 | in_dev = inetdev_init(dev); |
b217d616 HX |
1160 | if (!in_dev) |
1161 | return notifier_from_errno(-ENOMEM); | |
0cc217e1 | 1162 | if (dev->flags & IFF_LOOPBACK) { |
42f811b8 HX |
1163 | IN_DEV_CONF_SET(in_dev, NOXFRM, 1); |
1164 | IN_DEV_CONF_SET(in_dev, NOPOLICY, 1); | |
8030f544 | 1165 | } |
06770843 BL |
1166 | } else if (event == NETDEV_CHANGEMTU) { |
1167 | /* Re-enabling IP */ | |
1168 | if (inetdev_valid_mtu(dev->mtu)) | |
1169 | in_dev = inetdev_init(dev); | |
1da177e4 LT |
1170 | } |
1171 | goto out; | |
1172 | } | |
1173 | ||
1174 | switch (event) { | |
1175 | case NETDEV_REGISTER: | |
91df42be | 1176 | pr_debug("%s: bug\n", __func__); |
a9b3cd7f | 1177 | RCU_INIT_POINTER(dev->ip_ptr, NULL); |
1da177e4 LT |
1178 | break; |
1179 | case NETDEV_UP: | |
06770843 | 1180 | if (!inetdev_valid_mtu(dev->mtu)) |
1da177e4 | 1181 | break; |
0cc217e1 | 1182 | if (dev->flags & IFF_LOOPBACK) { |
9f9354b9 ED |
1183 | struct in_ifaddr *ifa = inet_alloc_ifa(); |
1184 | ||
1185 | if (ifa) { | |
fd23c3b3 | 1186 | INIT_HLIST_NODE(&ifa->hash); |
1da177e4 LT |
1187 | ifa->ifa_local = |
1188 | ifa->ifa_address = htonl(INADDR_LOOPBACK); | |
1189 | ifa->ifa_prefixlen = 8; | |
1190 | ifa->ifa_mask = inet_make_mask(8); | |
1191 | in_dev_hold(in_dev); | |
1192 | ifa->ifa_dev = in_dev; | |
1193 | ifa->ifa_scope = RT_SCOPE_HOST; | |
1194 | memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); | |
1195 | inet_insert_ifa(ifa); | |
1196 | } | |
1197 | } | |
1198 | ip_mc_up(in_dev); | |
eefef1cf SH |
1199 | /* fall through */ |
1200 | case NETDEV_CHANGEADDR: | |
d11327ad IC |
1201 | if (!IN_DEV_ARP_NOTIFY(in_dev)) |
1202 | break; | |
1203 | /* fall through */ | |
1204 | case NETDEV_NOTIFY_PEERS: | |
a21090cf | 1205 | /* Send gratuitous ARP to notify of link change */ |
d11327ad | 1206 | inetdev_send_gratuitous_arp(dev, in_dev); |
1da177e4 LT |
1207 | break; |
1208 | case NETDEV_DOWN: | |
1209 | ip_mc_down(in_dev); | |
1210 | break; | |
93d9b7d7 | 1211 | case NETDEV_PRE_TYPE_CHANGE: |
75c78500 MS |
1212 | ip_mc_unmap(in_dev); |
1213 | break; | |
93d9b7d7 | 1214 | case NETDEV_POST_TYPE_CHANGE: |
75c78500 MS |
1215 | ip_mc_remap(in_dev); |
1216 | break; | |
1da177e4 | 1217 | case NETDEV_CHANGEMTU: |
06770843 | 1218 | if (inetdev_valid_mtu(dev->mtu)) |
1da177e4 | 1219 | break; |
06770843 | 1220 | /* disable IP when MTU is not enough */ |
1da177e4 LT |
1221 | case NETDEV_UNREGISTER: |
1222 | inetdev_destroy(in_dev); | |
1223 | break; | |
1224 | case NETDEV_CHANGENAME: | |
1225 | /* Do not notify about label change, this event is | |
1226 | * not interesting to applications using netlink. | |
1227 | */ | |
1228 | inetdev_changename(dev, in_dev); | |
1229 | ||
51602b2a | 1230 | devinet_sysctl_unregister(in_dev); |
66f27a52 | 1231 | devinet_sysctl_register(in_dev); |
1da177e4 LT |
1232 | break; |
1233 | } | |
1234 | out: | |
1235 | return NOTIFY_DONE; | |
1236 | } | |
1237 | ||
1238 | static struct notifier_block ip_netdev_notifier = { | |
539afedf | 1239 | .notifier_call = inetdev_event, |
1da177e4 LT |
1240 | }; |
1241 | ||
339bf98f TG |
1242 | static inline size_t inet_nlmsg_size(void) |
1243 | { | |
1244 | return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) | |
1245 | + nla_total_size(4) /* IFA_ADDRESS */ | |
1246 | + nla_total_size(4) /* IFA_LOCAL */ | |
1247 | + nla_total_size(4) /* IFA_BROADCAST */ | |
339bf98f TG |
1248 | + nla_total_size(IFNAMSIZ); /* IFA_LABEL */ |
1249 | } | |
1250 | ||
1da177e4 | 1251 | static int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa, |
b6544c0b | 1252 | u32 pid, u32 seq, int event, unsigned int flags) |
1da177e4 LT |
1253 | { |
1254 | struct ifaddrmsg *ifm; | |
1255 | struct nlmsghdr *nlh; | |
1da177e4 | 1256 | |
47f68512 TG |
1257 | nlh = nlmsg_put(skb, pid, seq, event, sizeof(*ifm), flags); |
1258 | if (nlh == NULL) | |
26932566 | 1259 | return -EMSGSIZE; |
47f68512 TG |
1260 | |
1261 | ifm = nlmsg_data(nlh); | |
1da177e4 LT |
1262 | ifm->ifa_family = AF_INET; |
1263 | ifm->ifa_prefixlen = ifa->ifa_prefixlen; | |
1264 | ifm->ifa_flags = ifa->ifa_flags|IFA_F_PERMANENT; | |
1265 | ifm->ifa_scope = ifa->ifa_scope; | |
1266 | ifm->ifa_index = ifa->ifa_dev->dev->ifindex; | |
47f68512 | 1267 | |
f3756b79 DM |
1268 | if ((ifa->ifa_address && |
1269 | nla_put_be32(skb, IFA_ADDRESS, ifa->ifa_address)) || | |
1270 | (ifa->ifa_local && | |
1271 | nla_put_be32(skb, IFA_LOCAL, ifa->ifa_local)) || | |
1272 | (ifa->ifa_broadcast && | |
1273 | nla_put_be32(skb, IFA_BROADCAST, ifa->ifa_broadcast)) || | |
1274 | (ifa->ifa_label[0] && | |
1275 | nla_put_string(skb, IFA_LABEL, ifa->ifa_label))) | |
1276 | goto nla_put_failure; | |
1da177e4 | 1277 | |
47f68512 TG |
1278 | return nlmsg_end(skb, nlh); |
1279 | ||
1280 | nla_put_failure: | |
26932566 PM |
1281 | nlmsg_cancel(skb, nlh); |
1282 | return -EMSGSIZE; | |
1da177e4 LT |
1283 | } |
1284 | ||
1285 | static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) | |
1286 | { | |
3b1e0a65 | 1287 | struct net *net = sock_net(skb->sk); |
eec4df98 ED |
1288 | int h, s_h; |
1289 | int idx, s_idx; | |
1290 | int ip_idx, s_ip_idx; | |
1da177e4 LT |
1291 | struct net_device *dev; |
1292 | struct in_device *in_dev; | |
1293 | struct in_ifaddr *ifa; | |
eec4df98 ED |
1294 | struct hlist_head *head; |
1295 | struct hlist_node *node; | |
1da177e4 | 1296 | |
eec4df98 ED |
1297 | s_h = cb->args[0]; |
1298 | s_idx = idx = cb->args[1]; | |
1299 | s_ip_idx = ip_idx = cb->args[2]; | |
1300 | ||
1301 | for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { | |
1302 | idx = 0; | |
1303 | head = &net->dev_index_head[h]; | |
1304 | rcu_read_lock(); | |
1305 | hlist_for_each_entry_rcu(dev, node, head, index_hlist) { | |
1306 | if (idx < s_idx) | |
1307 | goto cont; | |
4b97efdf | 1308 | if (h > s_h || idx > s_idx) |
eec4df98 ED |
1309 | s_ip_idx = 0; |
1310 | in_dev = __in_dev_get_rcu(dev); | |
1311 | if (!in_dev) | |
1312 | goto cont; | |
1da177e4 | 1313 | |
eec4df98 ED |
1314 | for (ifa = in_dev->ifa_list, ip_idx = 0; ifa; |
1315 | ifa = ifa->ifa_next, ip_idx++) { | |
1316 | if (ip_idx < s_ip_idx) | |
1317 | continue; | |
1318 | if (inet_fill_ifaddr(skb, ifa, | |
1319 | NETLINK_CB(cb->skb).pid, | |
1da177e4 | 1320 | cb->nlh->nlmsg_seq, |
eec4df98 ED |
1321 | RTM_NEWADDR, NLM_F_MULTI) <= 0) { |
1322 | rcu_read_unlock(); | |
1323 | goto done; | |
1324 | } | |
1325 | } | |
7562f876 | 1326 | cont: |
eec4df98 ED |
1327 | idx++; |
1328 | } | |
1329 | rcu_read_unlock(); | |
1da177e4 LT |
1330 | } |
1331 | ||
1332 | done: | |
eec4df98 ED |
1333 | cb->args[0] = h; |
1334 | cb->args[1] = idx; | |
1335 | cb->args[2] = ip_idx; | |
1da177e4 LT |
1336 | |
1337 | return skb->len; | |
1338 | } | |
1339 | ||
539afedf | 1340 | static void rtmsg_ifa(int event, struct in_ifaddr *ifa, struct nlmsghdr *nlh, |
d6062cbb | 1341 | u32 pid) |
1da177e4 | 1342 | { |
47f68512 | 1343 | struct sk_buff *skb; |
d6062cbb TG |
1344 | u32 seq = nlh ? nlh->nlmsg_seq : 0; |
1345 | int err = -ENOBUFS; | |
4b8aa9ab | 1346 | struct net *net; |
1da177e4 | 1347 | |
c346dca1 | 1348 | net = dev_net(ifa->ifa_dev->dev); |
339bf98f | 1349 | skb = nlmsg_new(inet_nlmsg_size(), GFP_KERNEL); |
47f68512 | 1350 | if (skb == NULL) |
d6062cbb TG |
1351 | goto errout; |
1352 | ||
1353 | err = inet_fill_ifaddr(skb, ifa, pid, seq, event, 0); | |
26932566 PM |
1354 | if (err < 0) { |
1355 | /* -EMSGSIZE implies BUG in inet_nlmsg_size() */ | |
1356 | WARN_ON(err == -EMSGSIZE); | |
1357 | kfree_skb(skb); | |
1358 | goto errout; | |
1359 | } | |
1ce85fe4 PNA |
1360 | rtnl_notify(skb, net, pid, RTNLGRP_IPV4_IFADDR, nlh, GFP_KERNEL); |
1361 | return; | |
d6062cbb TG |
1362 | errout: |
1363 | if (err < 0) | |
4b8aa9ab | 1364 | rtnl_set_sk_err(net, RTNLGRP_IPV4_IFADDR, err); |
1da177e4 LT |
1365 | } |
1366 | ||
9f0f7272 TG |
1367 | static size_t inet_get_link_af_size(const struct net_device *dev) |
1368 | { | |
1fc19aff | 1369 | struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr); |
9f0f7272 TG |
1370 | |
1371 | if (!in_dev) | |
1372 | return 0; | |
1373 | ||
1374 | return nla_total_size(IPV4_DEVCONF_MAX * 4); /* IFLA_INET_CONF */ | |
1375 | } | |
1376 | ||
1377 | static int inet_fill_link_af(struct sk_buff *skb, const struct net_device *dev) | |
1378 | { | |
1fc19aff | 1379 | struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr); |
9f0f7272 TG |
1380 | struct nlattr *nla; |
1381 | int i; | |
1382 | ||
1383 | if (!in_dev) | |
1384 | return -ENODATA; | |
1385 | ||
1386 | nla = nla_reserve(skb, IFLA_INET_CONF, IPV4_DEVCONF_MAX * 4); | |
1387 | if (nla == NULL) | |
1388 | return -EMSGSIZE; | |
1389 | ||
1390 | for (i = 0; i < IPV4_DEVCONF_MAX; i++) | |
1391 | ((u32 *) nla_data(nla))[i] = in_dev->cnf.data[i]; | |
1392 | ||
1393 | return 0; | |
1394 | } | |
1395 | ||
1396 | static const struct nla_policy inet_af_policy[IFLA_INET_MAX+1] = { | |
1397 | [IFLA_INET_CONF] = { .type = NLA_NESTED }, | |
1398 | }; | |
1399 | ||
cf7afbfe TG |
1400 | static int inet_validate_link_af(const struct net_device *dev, |
1401 | const struct nlattr *nla) | |
9f0f7272 | 1402 | { |
9f0f7272 TG |
1403 | struct nlattr *a, *tb[IFLA_INET_MAX+1]; |
1404 | int err, rem; | |
1405 | ||
f7fce74e | 1406 | if (dev && !__in_dev_get_rtnl(dev)) |
cf7afbfe | 1407 | return -EAFNOSUPPORT; |
9f0f7272 TG |
1408 | |
1409 | err = nla_parse_nested(tb, IFLA_INET_MAX, nla, inet_af_policy); | |
1410 | if (err < 0) | |
1411 | return err; | |
1412 | ||
1413 | if (tb[IFLA_INET_CONF]) { | |
1414 | nla_for_each_nested(a, tb[IFLA_INET_CONF], rem) { | |
1415 | int cfgid = nla_type(a); | |
1416 | ||
1417 | if (nla_len(a) < 4) | |
1418 | return -EINVAL; | |
1419 | ||
1420 | if (cfgid <= 0 || cfgid > IPV4_DEVCONF_MAX) | |
1421 | return -EINVAL; | |
1422 | } | |
1423 | } | |
1424 | ||
cf7afbfe TG |
1425 | return 0; |
1426 | } | |
1427 | ||
1428 | static int inet_set_link_af(struct net_device *dev, const struct nlattr *nla) | |
1429 | { | |
f7fce74e | 1430 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
cf7afbfe TG |
1431 | struct nlattr *a, *tb[IFLA_INET_MAX+1]; |
1432 | int rem; | |
1433 | ||
1434 | if (!in_dev) | |
1435 | return -EAFNOSUPPORT; | |
1436 | ||
1437 | if (nla_parse_nested(tb, IFLA_INET_MAX, nla, NULL) < 0) | |
1438 | BUG(); | |
1439 | ||
9f0f7272 TG |
1440 | if (tb[IFLA_INET_CONF]) { |
1441 | nla_for_each_nested(a, tb[IFLA_INET_CONF], rem) | |
1442 | ipv4_devconf_set(in_dev, nla_type(a), nla_get_u32(a)); | |
1443 | } | |
1444 | ||
1445 | return 0; | |
1446 | } | |
1447 | ||
1da177e4 LT |
1448 | #ifdef CONFIG_SYSCTL |
1449 | ||
c0ce9fb3 | 1450 | static void devinet_copy_dflt_conf(struct net *net, int i) |
31be3085 HX |
1451 | { |
1452 | struct net_device *dev; | |
1453 | ||
c6d14c84 ED |
1454 | rcu_read_lock(); |
1455 | for_each_netdev_rcu(net, dev) { | |
31be3085 | 1456 | struct in_device *in_dev; |
c6d14c84 | 1457 | |
31be3085 HX |
1458 | in_dev = __in_dev_get_rcu(dev); |
1459 | if (in_dev && !test_bit(i, in_dev->cnf.state)) | |
9355bbd6 | 1460 | in_dev->cnf.data[i] = net->ipv4.devconf_dflt->data[i]; |
31be3085 | 1461 | } |
c6d14c84 | 1462 | rcu_read_unlock(); |
31be3085 HX |
1463 | } |
1464 | ||
c6d14c84 | 1465 | /* called with RTNL locked */ |
c0ce9fb3 | 1466 | static void inet_forward_change(struct net *net) |
68dd299b PE |
1467 | { |
1468 | struct net_device *dev; | |
586f1211 | 1469 | int on = IPV4_DEVCONF_ALL(net, FORWARDING); |
68dd299b | 1470 | |
586f1211 | 1471 | IPV4_DEVCONF_ALL(net, ACCEPT_REDIRECTS) = !on; |
9355bbd6 | 1472 | IPV4_DEVCONF_DFLT(net, FORWARDING) = on; |
68dd299b | 1473 | |
c0ce9fb3 | 1474 | for_each_netdev(net, dev) { |
68dd299b | 1475 | struct in_device *in_dev; |
0187bdfb BH |
1476 | if (on) |
1477 | dev_disable_lro(dev); | |
68dd299b PE |
1478 | rcu_read_lock(); |
1479 | in_dev = __in_dev_get_rcu(dev); | |
1480 | if (in_dev) | |
1481 | IN_DEV_CONF_SET(in_dev, FORWARDING, on); | |
1482 | rcu_read_unlock(); | |
1483 | } | |
68dd299b PE |
1484 | } |
1485 | ||
31be3085 | 1486 | static int devinet_conf_proc(ctl_table *ctl, int write, |
8d65af78 | 1487 | void __user *buffer, |
31be3085 HX |
1488 | size_t *lenp, loff_t *ppos) |
1489 | { | |
d01ff0a0 | 1490 | int old_value = *(int *)ctl->data; |
8d65af78 | 1491 | int ret = proc_dointvec(ctl, write, buffer, lenp, ppos); |
d01ff0a0 | 1492 | int new_value = *(int *)ctl->data; |
31be3085 HX |
1493 | |
1494 | if (write) { | |
1495 | struct ipv4_devconf *cnf = ctl->extra1; | |
c0ce9fb3 | 1496 | struct net *net = ctl->extra2; |
31be3085 HX |
1497 | int i = (int *)ctl->data - cnf->data; |
1498 | ||
1499 | set_bit(i, cnf->state); | |
1500 | ||
9355bbd6 | 1501 | if (cnf == net->ipv4.devconf_dflt) |
c0ce9fb3 | 1502 | devinet_copy_dflt_conf(net, i); |
d0daebc3 TG |
1503 | if (i == IPV4_DEVCONF_ACCEPT_LOCAL - 1 || |
1504 | i == IPV4_DEVCONF_ROUTE_LOCALNET - 1) | |
d01ff0a0 | 1505 | if ((new_value == 0) && (old_value != 0)) |
bafa6d9d | 1506 | rt_cache_flush(net); |
31be3085 HX |
1507 | } |
1508 | ||
1509 | return ret; | |
1510 | } | |
1511 | ||
1da177e4 | 1512 | static int devinet_sysctl_forward(ctl_table *ctl, int write, |
8d65af78 | 1513 | void __user *buffer, |
1da177e4 LT |
1514 | size_t *lenp, loff_t *ppos) |
1515 | { | |
1516 | int *valp = ctl->data; | |
1517 | int val = *valp; | |
88af182e | 1518 | loff_t pos = *ppos; |
8d65af78 | 1519 | int ret = proc_dointvec(ctl, write, buffer, lenp, ppos); |
1da177e4 LT |
1520 | |
1521 | if (write && *valp != val) { | |
c0ce9fb3 PE |
1522 | struct net *net = ctl->extra2; |
1523 | ||
0187bdfb | 1524 | if (valp != &IPV4_DEVCONF_DFLT(net, FORWARDING)) { |
88af182e EB |
1525 | if (!rtnl_trylock()) { |
1526 | /* Restore the original values before restarting */ | |
1527 | *valp = val; | |
1528 | *ppos = pos; | |
9b8adb5e | 1529 | return restart_syscall(); |
88af182e | 1530 | } |
0187bdfb BH |
1531 | if (valp == &IPV4_DEVCONF_ALL(net, FORWARDING)) { |
1532 | inet_forward_change(net); | |
1533 | } else if (*valp) { | |
1534 | struct ipv4_devconf *cnf = ctl->extra1; | |
1535 | struct in_device *idev = | |
1536 | container_of(cnf, struct in_device, cnf); | |
1537 | dev_disable_lro(idev->dev); | |
1538 | } | |
1539 | rtnl_unlock(); | |
bafa6d9d | 1540 | rt_cache_flush(net); |
0187bdfb | 1541 | } |
1da177e4 LT |
1542 | } |
1543 | ||
1544 | return ret; | |
1545 | } | |
1546 | ||
323e126f DM |
1547 | static int ipv4_doint_and_flush(ctl_table *ctl, int write, |
1548 | void __user *buffer, | |
1549 | size_t *lenp, loff_t *ppos) | |
1da177e4 LT |
1550 | { |
1551 | int *valp = ctl->data; | |
1552 | int val = *valp; | |
8d65af78 | 1553 | int ret = proc_dointvec(ctl, write, buffer, lenp, ppos); |
76e6ebfb | 1554 | struct net *net = ctl->extra2; |
1da177e4 LT |
1555 | |
1556 | if (write && *valp != val) | |
bafa6d9d | 1557 | rt_cache_flush(net); |
1da177e4 LT |
1558 | |
1559 | return ret; | |
1560 | } | |
1561 | ||
f8572d8f | 1562 | #define DEVINET_SYSCTL_ENTRY(attr, name, mval, proc) \ |
42f811b8 | 1563 | { \ |
42f811b8 HX |
1564 | .procname = name, \ |
1565 | .data = ipv4_devconf.data + \ | |
02291680 | 1566 | IPV4_DEVCONF_ ## attr - 1, \ |
42f811b8 HX |
1567 | .maxlen = sizeof(int), \ |
1568 | .mode = mval, \ | |
1569 | .proc_handler = proc, \ | |
31be3085 | 1570 | .extra1 = &ipv4_devconf, \ |
42f811b8 HX |
1571 | } |
1572 | ||
1573 | #define DEVINET_SYSCTL_RW_ENTRY(attr, name) \ | |
f8572d8f | 1574 | DEVINET_SYSCTL_ENTRY(attr, name, 0644, devinet_conf_proc) |
42f811b8 HX |
1575 | |
1576 | #define DEVINET_SYSCTL_RO_ENTRY(attr, name) \ | |
f8572d8f | 1577 | DEVINET_SYSCTL_ENTRY(attr, name, 0444, devinet_conf_proc) |
42f811b8 | 1578 | |
f8572d8f EB |
1579 | #define DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, proc) \ |
1580 | DEVINET_SYSCTL_ENTRY(attr, name, 0644, proc) | |
42f811b8 HX |
1581 | |
1582 | #define DEVINET_SYSCTL_FLUSHING_ENTRY(attr, name) \ | |
f8572d8f | 1583 | DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, ipv4_doint_and_flush) |
42f811b8 | 1584 | |
1da177e4 LT |
1585 | static struct devinet_sysctl_table { |
1586 | struct ctl_table_header *sysctl_header; | |
02291680 | 1587 | struct ctl_table devinet_vars[__IPV4_DEVCONF_MAX]; |
1da177e4 LT |
1588 | } devinet_sysctl = { |
1589 | .devinet_vars = { | |
42f811b8 | 1590 | DEVINET_SYSCTL_COMPLEX_ENTRY(FORWARDING, "forwarding", |
f8572d8f | 1591 | devinet_sysctl_forward), |
42f811b8 HX |
1592 | DEVINET_SYSCTL_RO_ENTRY(MC_FORWARDING, "mc_forwarding"), |
1593 | ||
1594 | DEVINET_SYSCTL_RW_ENTRY(ACCEPT_REDIRECTS, "accept_redirects"), | |
1595 | DEVINET_SYSCTL_RW_ENTRY(SECURE_REDIRECTS, "secure_redirects"), | |
1596 | DEVINET_SYSCTL_RW_ENTRY(SHARED_MEDIA, "shared_media"), | |
1597 | DEVINET_SYSCTL_RW_ENTRY(RP_FILTER, "rp_filter"), | |
1598 | DEVINET_SYSCTL_RW_ENTRY(SEND_REDIRECTS, "send_redirects"), | |
1599 | DEVINET_SYSCTL_RW_ENTRY(ACCEPT_SOURCE_ROUTE, | |
1600 | "accept_source_route"), | |
8153a10c | 1601 | DEVINET_SYSCTL_RW_ENTRY(ACCEPT_LOCAL, "accept_local"), |
28f6aeea | 1602 | DEVINET_SYSCTL_RW_ENTRY(SRC_VMARK, "src_valid_mark"), |
42f811b8 HX |
1603 | DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP, "proxy_arp"), |
1604 | DEVINET_SYSCTL_RW_ENTRY(MEDIUM_ID, "medium_id"), | |
1605 | DEVINET_SYSCTL_RW_ENTRY(BOOTP_RELAY, "bootp_relay"), | |
1606 | DEVINET_SYSCTL_RW_ENTRY(LOG_MARTIANS, "log_martians"), | |
1607 | DEVINET_SYSCTL_RW_ENTRY(TAG, "tag"), | |
1608 | DEVINET_SYSCTL_RW_ENTRY(ARPFILTER, "arp_filter"), | |
1609 | DEVINET_SYSCTL_RW_ENTRY(ARP_ANNOUNCE, "arp_announce"), | |
1610 | DEVINET_SYSCTL_RW_ENTRY(ARP_IGNORE, "arp_ignore"), | |
1611 | DEVINET_SYSCTL_RW_ENTRY(ARP_ACCEPT, "arp_accept"), | |
eefef1cf | 1612 | DEVINET_SYSCTL_RW_ENTRY(ARP_NOTIFY, "arp_notify"), |
65324144 | 1613 | DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP_PVLAN, "proxy_arp_pvlan"), |
42f811b8 HX |
1614 | |
1615 | DEVINET_SYSCTL_FLUSHING_ENTRY(NOXFRM, "disable_xfrm"), | |
1616 | DEVINET_SYSCTL_FLUSHING_ENTRY(NOPOLICY, "disable_policy"), | |
1617 | DEVINET_SYSCTL_FLUSHING_ENTRY(FORCE_IGMP_VERSION, | |
1618 | "force_igmp_version"), | |
1619 | DEVINET_SYSCTL_FLUSHING_ENTRY(PROMOTE_SECONDARIES, | |
1620 | "promote_secondaries"), | |
d0daebc3 TG |
1621 | DEVINET_SYSCTL_FLUSHING_ENTRY(ROUTE_LOCALNET, |
1622 | "route_localnet"), | |
1da177e4 | 1623 | }, |
1da177e4 LT |
1624 | }; |
1625 | ||
ea40b324 | 1626 | static int __devinet_sysctl_register(struct net *net, char *dev_name, |
f8572d8f | 1627 | struct ipv4_devconf *p) |
1da177e4 LT |
1628 | { |
1629 | int i; | |
9fa89642 | 1630 | struct devinet_sysctl_table *t; |
8607ddb8 | 1631 | char path[sizeof("net/ipv4/conf/") + IFNAMSIZ]; |
bfada697 | 1632 | |
9fa89642 | 1633 | t = kmemdup(&devinet_sysctl, sizeof(*t), GFP_KERNEL); |
1da177e4 | 1634 | if (!t) |
9fa89642 PE |
1635 | goto out; |
1636 | ||
1da177e4 LT |
1637 | for (i = 0; i < ARRAY_SIZE(t->devinet_vars) - 1; i++) { |
1638 | t->devinet_vars[i].data += (char *)p - (char *)&ipv4_devconf; | |
31be3085 | 1639 | t->devinet_vars[i].extra1 = p; |
c0ce9fb3 | 1640 | t->devinet_vars[i].extra2 = net; |
1da177e4 LT |
1641 | } |
1642 | ||
8607ddb8 | 1643 | snprintf(path, sizeof(path), "net/ipv4/conf/%s", dev_name); |
1da177e4 | 1644 | |
8607ddb8 | 1645 | t->sysctl_header = register_net_sysctl(net, path, t->devinet_vars); |
1da177e4 | 1646 | if (!t->sysctl_header) |
8607ddb8 | 1647 | goto free; |
1da177e4 LT |
1648 | |
1649 | p->sysctl = t; | |
ea40b324 | 1650 | return 0; |
1da177e4 | 1651 | |
9fa89642 | 1652 | free: |
1da177e4 | 1653 | kfree(t); |
9fa89642 | 1654 | out: |
ea40b324 | 1655 | return -ENOBUFS; |
1da177e4 LT |
1656 | } |
1657 | ||
51602b2a PE |
1658 | static void __devinet_sysctl_unregister(struct ipv4_devconf *cnf) |
1659 | { | |
1660 | struct devinet_sysctl_table *t = cnf->sysctl; | |
1661 | ||
1662 | if (t == NULL) | |
1663 | return; | |
1664 | ||
1665 | cnf->sysctl = NULL; | |
ff538818 | 1666 | unregister_net_sysctl_table(t->sysctl_header); |
51602b2a PE |
1667 | kfree(t); |
1668 | } | |
1669 | ||
66f27a52 PE |
1670 | static void devinet_sysctl_register(struct in_device *idev) |
1671 | { | |
54716e3b | 1672 | neigh_sysctl_register(idev->dev, idev->arp_parms, "ipv4", NULL); |
c346dca1 | 1673 | __devinet_sysctl_register(dev_net(idev->dev), idev->dev->name, |
f8572d8f | 1674 | &idev->cnf); |
66f27a52 PE |
1675 | } |
1676 | ||
51602b2a | 1677 | static void devinet_sysctl_unregister(struct in_device *idev) |
1da177e4 | 1678 | { |
51602b2a PE |
1679 | __devinet_sysctl_unregister(&idev->cnf); |
1680 | neigh_sysctl_unregister(idev->arp_parms); | |
1da177e4 | 1681 | } |
1da177e4 | 1682 | |
68dd299b PE |
1683 | static struct ctl_table ctl_forward_entry[] = { |
1684 | { | |
68dd299b PE |
1685 | .procname = "ip_forward", |
1686 | .data = &ipv4_devconf.data[ | |
02291680 | 1687 | IPV4_DEVCONF_FORWARDING - 1], |
68dd299b PE |
1688 | .maxlen = sizeof(int), |
1689 | .mode = 0644, | |
1690 | .proc_handler = devinet_sysctl_forward, | |
68dd299b | 1691 | .extra1 = &ipv4_devconf, |
c0ce9fb3 | 1692 | .extra2 = &init_net, |
68dd299b PE |
1693 | }, |
1694 | { }, | |
1695 | }; | |
2a75de0c | 1696 | #endif |
68dd299b | 1697 | |
752d14dc PE |
1698 | static __net_init int devinet_init_net(struct net *net) |
1699 | { | |
1700 | int err; | |
752d14dc | 1701 | struct ipv4_devconf *all, *dflt; |
2a75de0c ED |
1702 | #ifdef CONFIG_SYSCTL |
1703 | struct ctl_table *tbl = ctl_forward_entry; | |
752d14dc | 1704 | struct ctl_table_header *forw_hdr; |
2a75de0c | 1705 | #endif |
752d14dc PE |
1706 | |
1707 | err = -ENOMEM; | |
1708 | all = &ipv4_devconf; | |
1709 | dflt = &ipv4_devconf_dflt; | |
752d14dc | 1710 | |
09ad9bc7 | 1711 | if (!net_eq(net, &init_net)) { |
752d14dc PE |
1712 | all = kmemdup(all, sizeof(ipv4_devconf), GFP_KERNEL); |
1713 | if (all == NULL) | |
1714 | goto err_alloc_all; | |
1715 | ||
1716 | dflt = kmemdup(dflt, sizeof(ipv4_devconf_dflt), GFP_KERNEL); | |
1717 | if (dflt == NULL) | |
1718 | goto err_alloc_dflt; | |
1719 | ||
2a75de0c | 1720 | #ifdef CONFIG_SYSCTL |
752d14dc PE |
1721 | tbl = kmemdup(tbl, sizeof(ctl_forward_entry), GFP_KERNEL); |
1722 | if (tbl == NULL) | |
1723 | goto err_alloc_ctl; | |
1724 | ||
02291680 | 1725 | tbl[0].data = &all->data[IPV4_DEVCONF_FORWARDING - 1]; |
752d14dc PE |
1726 | tbl[0].extra1 = all; |
1727 | tbl[0].extra2 = net; | |
2a75de0c | 1728 | #endif |
752d14dc PE |
1729 | } |
1730 | ||
1731 | #ifdef CONFIG_SYSCTL | |
f8572d8f | 1732 | err = __devinet_sysctl_register(net, "all", all); |
752d14dc PE |
1733 | if (err < 0) |
1734 | goto err_reg_all; | |
1735 | ||
f8572d8f | 1736 | err = __devinet_sysctl_register(net, "default", dflt); |
752d14dc PE |
1737 | if (err < 0) |
1738 | goto err_reg_dflt; | |
1739 | ||
1740 | err = -ENOMEM; | |
8607ddb8 | 1741 | forw_hdr = register_net_sysctl(net, "net/ipv4", tbl); |
752d14dc PE |
1742 | if (forw_hdr == NULL) |
1743 | goto err_reg_ctl; | |
2a75de0c | 1744 | net->ipv4.forw_hdr = forw_hdr; |
752d14dc PE |
1745 | #endif |
1746 | ||
752d14dc PE |
1747 | net->ipv4.devconf_all = all; |
1748 | net->ipv4.devconf_dflt = dflt; | |
1749 | return 0; | |
1750 | ||
1751 | #ifdef CONFIG_SYSCTL | |
1752 | err_reg_ctl: | |
1753 | __devinet_sysctl_unregister(dflt); | |
1754 | err_reg_dflt: | |
1755 | __devinet_sysctl_unregister(all); | |
1756 | err_reg_all: | |
1757 | if (tbl != ctl_forward_entry) | |
1758 | kfree(tbl); | |
752d14dc | 1759 | err_alloc_ctl: |
2a75de0c | 1760 | #endif |
752d14dc PE |
1761 | if (dflt != &ipv4_devconf_dflt) |
1762 | kfree(dflt); | |
1763 | err_alloc_dflt: | |
1764 | if (all != &ipv4_devconf) | |
1765 | kfree(all); | |
1766 | err_alloc_all: | |
1767 | return err; | |
1768 | } | |
1769 | ||
1770 | static __net_exit void devinet_exit_net(struct net *net) | |
1771 | { | |
2a75de0c | 1772 | #ifdef CONFIG_SYSCTL |
752d14dc PE |
1773 | struct ctl_table *tbl; |
1774 | ||
1775 | tbl = net->ipv4.forw_hdr->ctl_table_arg; | |
752d14dc PE |
1776 | unregister_net_sysctl_table(net->ipv4.forw_hdr); |
1777 | __devinet_sysctl_unregister(net->ipv4.devconf_dflt); | |
1778 | __devinet_sysctl_unregister(net->ipv4.devconf_all); | |
752d14dc | 1779 | kfree(tbl); |
2a75de0c | 1780 | #endif |
752d14dc PE |
1781 | kfree(net->ipv4.devconf_dflt); |
1782 | kfree(net->ipv4.devconf_all); | |
1783 | } | |
1784 | ||
1785 | static __net_initdata struct pernet_operations devinet_ops = { | |
1786 | .init = devinet_init_net, | |
1787 | .exit = devinet_exit_net, | |
1788 | }; | |
1789 | ||
9f0f7272 TG |
1790 | static struct rtnl_af_ops inet_af_ops = { |
1791 | .family = AF_INET, | |
1792 | .fill_link_af = inet_fill_link_af, | |
1793 | .get_link_af_size = inet_get_link_af_size, | |
cf7afbfe TG |
1794 | .validate_link_af = inet_validate_link_af, |
1795 | .set_link_af = inet_set_link_af, | |
9f0f7272 TG |
1796 | }; |
1797 | ||
1da177e4 LT |
1798 | void __init devinet_init(void) |
1799 | { | |
fd23c3b3 DM |
1800 | int i; |
1801 | ||
1802 | for (i = 0; i < IN4_ADDR_HSIZE; i++) | |
1803 | INIT_HLIST_HEAD(&inet_addr_lst[i]); | |
1804 | ||
752d14dc PE |
1805 | register_pernet_subsys(&devinet_ops); |
1806 | ||
1da177e4 LT |
1807 | register_gifconf(PF_INET, inet_gifconf); |
1808 | register_netdevice_notifier(&ip_netdev_notifier); | |
63f3444f | 1809 | |
9f0f7272 TG |
1810 | rtnl_af_register(&inet_af_ops); |
1811 | ||
c7ac8679 GR |
1812 | rtnl_register(PF_INET, RTM_NEWADDR, inet_rtm_newaddr, NULL, NULL); |
1813 | rtnl_register(PF_INET, RTM_DELADDR, inet_rtm_deladdr, NULL, NULL); | |
1814 | rtnl_register(PF_INET, RTM_GETADDR, NULL, inet_dump_ifaddr, NULL); | |
1da177e4 LT |
1815 | } |
1816 |