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> | |
edc9e748 | 58 | #include <linux/netconf.h> |
1da177e4 | 59 | |
14c85021 | 60 | #include <net/arp.h> |
1da177e4 | 61 | #include <net/ip.h> |
6fa3eb70 | 62 | #include <net/tcp.h> |
1da177e4 LT |
63 | #include <net/route.h> |
64 | #include <net/ip_fib.h> | |
63f3444f | 65 | #include <net/rtnetlink.h> |
752d14dc | 66 | #include <net/net_namespace.h> |
5c766d64 | 67 | #include <net/addrconf.h> |
1da177e4 | 68 | |
406b6f97 DM |
69 | #include "fib_lookup.h" |
70 | ||
0027ba84 | 71 | static struct ipv4_devconf ipv4_devconf = { |
42f811b8 | 72 | .data = { |
02291680 EB |
73 | [IPV4_DEVCONF_ACCEPT_REDIRECTS - 1] = 1, |
74 | [IPV4_DEVCONF_SEND_REDIRECTS - 1] = 1, | |
75 | [IPV4_DEVCONF_SECURE_REDIRECTS - 1] = 1, | |
76 | [IPV4_DEVCONF_SHARED_MEDIA - 1] = 1, | |
42f811b8 | 77 | }, |
1da177e4 LT |
78 | }; |
79 | ||
80 | static struct ipv4_devconf ipv4_devconf_dflt = { | |
42f811b8 | 81 | .data = { |
02291680 EB |
82 | [IPV4_DEVCONF_ACCEPT_REDIRECTS - 1] = 1, |
83 | [IPV4_DEVCONF_SEND_REDIRECTS - 1] = 1, | |
84 | [IPV4_DEVCONF_SECURE_REDIRECTS - 1] = 1, | |
85 | [IPV4_DEVCONF_SHARED_MEDIA - 1] = 1, | |
86 | [IPV4_DEVCONF_ACCEPT_SOURCE_ROUTE - 1] = 1, | |
42f811b8 | 87 | }, |
1da177e4 LT |
88 | }; |
89 | ||
9355bbd6 PE |
90 | #define IPV4_DEVCONF_DFLT(net, attr) \ |
91 | IPV4_DEVCONF((*net->ipv4.devconf_dflt), attr) | |
42f811b8 | 92 | |
ef7c79ed | 93 | static const struct nla_policy ifa_ipv4_policy[IFA_MAX+1] = { |
5c753978 TG |
94 | [IFA_LOCAL] = { .type = NLA_U32 }, |
95 | [IFA_ADDRESS] = { .type = NLA_U32 }, | |
96 | [IFA_BROADCAST] = { .type = NLA_U32 }, | |
5176f91e | 97 | [IFA_LABEL] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, |
5c766d64 | 98 | [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, |
5c753978 TG |
99 | }; |
100 | ||
40384999 ED |
101 | #define IN4_ADDR_HSIZE_SHIFT 8 |
102 | #define IN4_ADDR_HSIZE (1U << IN4_ADDR_HSIZE_SHIFT) | |
103 | ||
fd23c3b3 DM |
104 | static struct hlist_head inet_addr_lst[IN4_ADDR_HSIZE]; |
105 | static DEFINE_SPINLOCK(inet_addr_hash_lock); | |
106 | ||
40384999 | 107 | static u32 inet_addr_hash(struct net *net, __be32 addr) |
fd23c3b3 | 108 | { |
40384999 | 109 | u32 val = (__force u32) addr ^ net_hash_mix(net); |
fd23c3b3 | 110 | |
40384999 | 111 | return hash_32(val, IN4_ADDR_HSIZE_SHIFT); |
fd23c3b3 DM |
112 | } |
113 | ||
114 | static void inet_hash_insert(struct net *net, struct in_ifaddr *ifa) | |
115 | { | |
40384999 | 116 | u32 hash = inet_addr_hash(net, ifa->ifa_local); |
fd23c3b3 DM |
117 | |
118 | spin_lock(&inet_addr_hash_lock); | |
119 | hlist_add_head_rcu(&ifa->hash, &inet_addr_lst[hash]); | |
120 | spin_unlock(&inet_addr_hash_lock); | |
121 | } | |
122 | ||
123 | static void inet_hash_remove(struct in_ifaddr *ifa) | |
124 | { | |
125 | spin_lock(&inet_addr_hash_lock); | |
126 | hlist_del_init_rcu(&ifa->hash); | |
127 | spin_unlock(&inet_addr_hash_lock); | |
128 | } | |
129 | ||
9435eb1c DM |
130 | /** |
131 | * __ip_dev_find - find the first device with a given source address. | |
132 | * @net: the net namespace | |
133 | * @addr: the source address | |
134 | * @devref: if true, take a reference on the found device | |
135 | * | |
136 | * If a caller uses devref=false, it should be protected by RCU, or RTNL | |
137 | */ | |
138 | struct net_device *__ip_dev_find(struct net *net, __be32 addr, bool devref) | |
139 | { | |
40384999 | 140 | u32 hash = inet_addr_hash(net, addr); |
9435eb1c DM |
141 | struct net_device *result = NULL; |
142 | struct in_ifaddr *ifa; | |
9435eb1c DM |
143 | |
144 | rcu_read_lock(); | |
b67bfe0d | 145 | hlist_for_each_entry_rcu(ifa, &inet_addr_lst[hash], hash) { |
e066008b | 146 | if (ifa->ifa_local == addr) { |
40384999 ED |
147 | struct net_device *dev = ifa->ifa_dev->dev; |
148 | ||
149 | if (!net_eq(dev_net(dev), net)) | |
150 | continue; | |
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 | |
40384999 | 185 | static void devinet_sysctl_register(struct in_device *idev) |
51602b2a PE |
186 | { |
187 | } | |
40384999 | 188 | static void devinet_sysctl_unregister(struct in_device *idev) |
51602b2a PE |
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 | ||
40384999 | 208 | static void inet_free_ifa(struct in_ifaddr *ifa) |
1da177e4 LT |
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 | 316 | static void __inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap, |
15e47304 | 317 | int destroy, struct nlmsghdr *nlh, u32 portid) |
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 | |
15e47304 | 351 | rtmsg_ifa(RTM_DELADDR, ifa, nlh, portid); |
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 | */ | |
15e47304 | 388 | rtmsg_ifa(RTM_DELADDR, ifa1, nlh, portid); |
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; |
15e47304 | 401 | rtmsg_ifa(RTM_NEWADDR, promote, nlh, portid); |
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 | ||
5c766d64 JP |
422 | static void check_lifetime(struct work_struct *work); |
423 | ||
424 | static DECLARE_DELAYED_WORK(check_lifetime_work, check_lifetime); | |
425 | ||
d6062cbb | 426 | static int __inet_insert_ifa(struct in_ifaddr *ifa, struct nlmsghdr *nlh, |
15e47304 | 427 | u32 portid) |
1da177e4 LT |
428 | { |
429 | struct in_device *in_dev = ifa->ifa_dev; | |
430 | struct in_ifaddr *ifa1, **ifap, **last_primary; | |
431 | ||
432 | ASSERT_RTNL(); | |
433 | ||
434 | if (!ifa->ifa_local) { | |
435 | inet_free_ifa(ifa); | |
436 | return 0; | |
437 | } | |
438 | ||
439 | ifa->ifa_flags &= ~IFA_F_SECONDARY; | |
440 | last_primary = &in_dev->ifa_list; | |
441 | ||
442 | for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL; | |
443 | ifap = &ifa1->ifa_next) { | |
444 | if (!(ifa1->ifa_flags & IFA_F_SECONDARY) && | |
445 | ifa->ifa_scope <= ifa1->ifa_scope) | |
446 | last_primary = &ifa1->ifa_next; | |
447 | if (ifa1->ifa_mask == ifa->ifa_mask && | |
448 | inet_ifa_match(ifa1->ifa_address, ifa)) { | |
449 | if (ifa1->ifa_local == ifa->ifa_local) { | |
450 | inet_free_ifa(ifa); | |
451 | return -EEXIST; | |
452 | } | |
453 | if (ifa1->ifa_scope != ifa->ifa_scope) { | |
454 | inet_free_ifa(ifa); | |
455 | return -EINVAL; | |
456 | } | |
457 | ifa->ifa_flags |= IFA_F_SECONDARY; | |
458 | } | |
459 | } | |
460 | ||
461 | if (!(ifa->ifa_flags & IFA_F_SECONDARY)) { | |
462 | net_srandom(ifa->ifa_local); | |
463 | ifap = last_primary; | |
464 | } | |
465 | ||
466 | ifa->ifa_next = *ifap; | |
467 | *ifap = ifa; | |
468 | ||
fd23c3b3 DM |
469 | inet_hash_insert(dev_net(in_dev->dev), ifa); |
470 | ||
5c766d64 JP |
471 | cancel_delayed_work(&check_lifetime_work); |
472 | schedule_delayed_work(&check_lifetime_work, 0); | |
473 | ||
1da177e4 LT |
474 | /* Send message first, then call notifier. |
475 | Notifier will trigger FIB update, so that | |
476 | listeners of netlink will know about new ifaddr */ | |
15e47304 | 477 | rtmsg_ifa(RTM_NEWADDR, ifa, nlh, portid); |
e041c683 | 478 | blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa); |
1da177e4 LT |
479 | |
480 | return 0; | |
481 | } | |
482 | ||
d6062cbb TG |
483 | static int inet_insert_ifa(struct in_ifaddr *ifa) |
484 | { | |
485 | return __inet_insert_ifa(ifa, NULL, 0); | |
486 | } | |
487 | ||
1da177e4 LT |
488 | static int inet_set_ifa(struct net_device *dev, struct in_ifaddr *ifa) |
489 | { | |
e5ed6399 | 490 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
1da177e4 LT |
491 | |
492 | ASSERT_RTNL(); | |
493 | ||
494 | if (!in_dev) { | |
71e27da9 HX |
495 | inet_free_ifa(ifa); |
496 | return -ENOBUFS; | |
1da177e4 | 497 | } |
71e27da9 | 498 | ipv4_devconf_setall(in_dev); |
1da177e4 | 499 | if (ifa->ifa_dev != in_dev) { |
547b792c | 500 | WARN_ON(ifa->ifa_dev); |
1da177e4 LT |
501 | in_dev_hold(in_dev); |
502 | ifa->ifa_dev = in_dev; | |
503 | } | |
f97c1e0c | 504 | if (ipv4_is_loopback(ifa->ifa_local)) |
1da177e4 LT |
505 | ifa->ifa_scope = RT_SCOPE_HOST; |
506 | return inet_insert_ifa(ifa); | |
507 | } | |
508 | ||
8723e1b4 ED |
509 | /* Caller must hold RCU or RTNL : |
510 | * We dont take a reference on found in_device | |
511 | */ | |
7fee0ca2 | 512 | struct in_device *inetdev_by_index(struct net *net, int ifindex) |
1da177e4 LT |
513 | { |
514 | struct net_device *dev; | |
515 | struct in_device *in_dev = NULL; | |
c148fc2e ED |
516 | |
517 | rcu_read_lock(); | |
518 | dev = dev_get_by_index_rcu(net, ifindex); | |
1da177e4 | 519 | if (dev) |
8723e1b4 | 520 | in_dev = rcu_dereference_rtnl(dev->ip_ptr); |
c148fc2e | 521 | rcu_read_unlock(); |
1da177e4 LT |
522 | return in_dev; |
523 | } | |
9f9354b9 | 524 | EXPORT_SYMBOL(inetdev_by_index); |
1da177e4 LT |
525 | |
526 | /* Called only from RTNL semaphored context. No locks. */ | |
527 | ||
60cad5da AV |
528 | struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix, |
529 | __be32 mask) | |
1da177e4 LT |
530 | { |
531 | ASSERT_RTNL(); | |
532 | ||
533 | for_primary_ifa(in_dev) { | |
534 | if (ifa->ifa_mask == mask && inet_ifa_match(prefix, ifa)) | |
535 | return ifa; | |
536 | } endfor_ifa(in_dev); | |
537 | return NULL; | |
538 | } | |
539 | ||
661d2967 | 540 | static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh) |
1da177e4 | 541 | { |
3b1e0a65 | 542 | struct net *net = sock_net(skb->sk); |
dfdd5fd4 | 543 | struct nlattr *tb[IFA_MAX+1]; |
1da177e4 | 544 | struct in_device *in_dev; |
dfdd5fd4 | 545 | struct ifaddrmsg *ifm; |
1da177e4 | 546 | struct in_ifaddr *ifa, **ifap; |
dfdd5fd4 | 547 | int err = -EINVAL; |
1da177e4 LT |
548 | |
549 | ASSERT_RTNL(); | |
550 | ||
dfdd5fd4 TG |
551 | err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy); |
552 | if (err < 0) | |
553 | goto errout; | |
554 | ||
555 | ifm = nlmsg_data(nlh); | |
7fee0ca2 | 556 | in_dev = inetdev_by_index(net, ifm->ifa_index); |
dfdd5fd4 TG |
557 | if (in_dev == NULL) { |
558 | err = -ENODEV; | |
559 | goto errout; | |
560 | } | |
561 | ||
1da177e4 LT |
562 | for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; |
563 | ifap = &ifa->ifa_next) { | |
dfdd5fd4 | 564 | if (tb[IFA_LOCAL] && |
a7a628c4 | 565 | ifa->ifa_local != nla_get_be32(tb[IFA_LOCAL])) |
dfdd5fd4 TG |
566 | continue; |
567 | ||
568 | if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label)) | |
1da177e4 | 569 | continue; |
dfdd5fd4 TG |
570 | |
571 | if (tb[IFA_ADDRESS] && | |
572 | (ifm->ifa_prefixlen != ifa->ifa_prefixlen || | |
a7a628c4 | 573 | !inet_ifa_match(nla_get_be32(tb[IFA_ADDRESS]), ifa))) |
dfdd5fd4 TG |
574 | continue; |
575 | ||
15e47304 | 576 | __inet_del_ifa(in_dev, ifap, 1, nlh, NETLINK_CB(skb).portid); |
1da177e4 LT |
577 | return 0; |
578 | } | |
dfdd5fd4 TG |
579 | |
580 | err = -EADDRNOTAVAIL; | |
581 | errout: | |
582 | return err; | |
1da177e4 LT |
583 | } |
584 | ||
5c766d64 JP |
585 | #define INFINITY_LIFE_TIME 0xFFFFFFFF |
586 | ||
587 | static void check_lifetime(struct work_struct *work) | |
588 | { | |
589 | unsigned long now, next, next_sec, next_sched; | |
590 | struct in_ifaddr *ifa; | |
c988d1e8 | 591 | struct hlist_node *n; |
5c766d64 JP |
592 | int i; |
593 | ||
594 | now = jiffies; | |
595 | next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); | |
596 | ||
5c766d64 | 597 | for (i = 0; i < IN4_ADDR_HSIZE; i++) { |
c988d1e8 JP |
598 | bool change_needed = false; |
599 | ||
600 | rcu_read_lock(); | |
b67bfe0d | 601 | hlist_for_each_entry_rcu(ifa, &inet_addr_lst[i], hash) { |
5c766d64 JP |
602 | unsigned long age; |
603 | ||
604 | if (ifa->ifa_flags & IFA_F_PERMANENT) | |
605 | continue; | |
606 | ||
607 | /* We try to batch several events at once. */ | |
608 | age = (now - ifa->ifa_tstamp + | |
609 | ADDRCONF_TIMER_FUZZ_MINUS) / HZ; | |
610 | ||
611 | if (ifa->ifa_valid_lft != INFINITY_LIFE_TIME && | |
612 | age >= ifa->ifa_valid_lft) { | |
c988d1e8 | 613 | change_needed = true; |
5c766d64 JP |
614 | } else if (ifa->ifa_preferred_lft == |
615 | INFINITY_LIFE_TIME) { | |
616 | continue; | |
617 | } else if (age >= ifa->ifa_preferred_lft) { | |
618 | if (time_before(ifa->ifa_tstamp + | |
619 | ifa->ifa_valid_lft * HZ, next)) | |
620 | next = ifa->ifa_tstamp + | |
621 | ifa->ifa_valid_lft * HZ; | |
622 | ||
c988d1e8 JP |
623 | if (!(ifa->ifa_flags & IFA_F_DEPRECATED)) |
624 | change_needed = true; | |
5c766d64 JP |
625 | } else if (time_before(ifa->ifa_tstamp + |
626 | ifa->ifa_preferred_lft * HZ, | |
627 | next)) { | |
628 | next = ifa->ifa_tstamp + | |
629 | ifa->ifa_preferred_lft * HZ; | |
630 | } | |
631 | } | |
c988d1e8 JP |
632 | rcu_read_unlock(); |
633 | if (!change_needed) | |
634 | continue; | |
635 | rtnl_lock(); | |
636 | hlist_for_each_entry_safe(ifa, n, &inet_addr_lst[i], hash) { | |
637 | unsigned long age; | |
638 | ||
639 | if (ifa->ifa_flags & IFA_F_PERMANENT) | |
640 | continue; | |
641 | ||
642 | /* We try to batch several events at once. */ | |
643 | age = (now - ifa->ifa_tstamp + | |
644 | ADDRCONF_TIMER_FUZZ_MINUS) / HZ; | |
645 | ||
646 | if (ifa->ifa_valid_lft != INFINITY_LIFE_TIME && | |
647 | age >= ifa->ifa_valid_lft) { | |
648 | struct in_ifaddr **ifap; | |
649 | ||
650 | for (ifap = &ifa->ifa_dev->ifa_list; | |
651 | *ifap != NULL; ifap = &(*ifap)->ifa_next) { | |
652 | if (*ifap == ifa) { | |
653 | inet_del_ifa(ifa->ifa_dev, | |
654 | ifap, 1); | |
655 | break; | |
656 | } | |
657 | } | |
658 | } else if (ifa->ifa_preferred_lft != | |
659 | INFINITY_LIFE_TIME && | |
660 | age >= ifa->ifa_preferred_lft && | |
661 | !(ifa->ifa_flags & IFA_F_DEPRECATED)) { | |
662 | ifa->ifa_flags |= IFA_F_DEPRECATED; | |
663 | rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0); | |
664 | } | |
665 | } | |
666 | rtnl_unlock(); | |
5c766d64 | 667 | } |
5c766d64 JP |
668 | |
669 | next_sec = round_jiffies_up(next); | |
670 | next_sched = next; | |
671 | ||
672 | /* If rounded timeout is accurate enough, accept it. */ | |
673 | if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) | |
674 | next_sched = next_sec; | |
675 | ||
676 | now = jiffies; | |
677 | /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ | |
678 | if (time_before(next_sched, now + ADDRCONF_TIMER_FUZZ_MAX)) | |
679 | next_sched = now + ADDRCONF_TIMER_FUZZ_MAX; | |
680 | ||
681 | schedule_delayed_work(&check_lifetime_work, next_sched - now); | |
682 | } | |
683 | ||
684 | static void set_ifa_lifetime(struct in_ifaddr *ifa, __u32 valid_lft, | |
685 | __u32 prefered_lft) | |
686 | { | |
687 | unsigned long timeout; | |
688 | ||
689 | ifa->ifa_flags &= ~(IFA_F_PERMANENT | IFA_F_DEPRECATED); | |
690 | ||
691 | timeout = addrconf_timeout_fixup(valid_lft, HZ); | |
692 | if (addrconf_finite_timeout(timeout)) | |
693 | ifa->ifa_valid_lft = timeout; | |
694 | else | |
695 | ifa->ifa_flags |= IFA_F_PERMANENT; | |
696 | ||
697 | timeout = addrconf_timeout_fixup(prefered_lft, HZ); | |
698 | if (addrconf_finite_timeout(timeout)) { | |
699 | if (timeout == 0) | |
700 | ifa->ifa_flags |= IFA_F_DEPRECATED; | |
701 | ifa->ifa_preferred_lft = timeout; | |
702 | } | |
703 | ifa->ifa_tstamp = jiffies; | |
704 | if (!ifa->ifa_cstamp) | |
705 | ifa->ifa_cstamp = ifa->ifa_tstamp; | |
706 | } | |
707 | ||
708 | static struct in_ifaddr *rtm_to_ifaddr(struct net *net, struct nlmsghdr *nlh, | |
709 | __u32 *pvalid_lft, __u32 *pprefered_lft) | |
1da177e4 | 710 | { |
5c753978 TG |
711 | struct nlattr *tb[IFA_MAX+1]; |
712 | struct in_ifaddr *ifa; | |
713 | struct ifaddrmsg *ifm; | |
1da177e4 LT |
714 | struct net_device *dev; |
715 | struct in_device *in_dev; | |
7b218574 | 716 | int err; |
1da177e4 | 717 | |
5c753978 TG |
718 | err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy); |
719 | if (err < 0) | |
720 | goto errout; | |
1da177e4 | 721 | |
5c753978 | 722 | ifm = nlmsg_data(nlh); |
7b218574 DL |
723 | err = -EINVAL; |
724 | if (ifm->ifa_prefixlen > 32 || tb[IFA_LOCAL] == NULL) | |
5c753978 | 725 | goto errout; |
1da177e4 | 726 | |
4b8aa9ab | 727 | dev = __dev_get_by_index(net, ifm->ifa_index); |
7b218574 DL |
728 | err = -ENODEV; |
729 | if (dev == NULL) | |
5c753978 | 730 | goto errout; |
1da177e4 | 731 | |
5c753978 | 732 | in_dev = __in_dev_get_rtnl(dev); |
7b218574 DL |
733 | err = -ENOBUFS; |
734 | if (in_dev == NULL) | |
71e27da9 | 735 | goto errout; |
1da177e4 | 736 | |
5c753978 | 737 | ifa = inet_alloc_ifa(); |
7b218574 | 738 | if (ifa == NULL) |
5c753978 TG |
739 | /* |
740 | * A potential indev allocation can be left alive, it stays | |
741 | * assigned to its device and is destroy with it. | |
742 | */ | |
5c753978 | 743 | goto errout; |
5c753978 | 744 | |
a4e65d36 | 745 | ipv4_devconf_setall(in_dev); |
5c753978 TG |
746 | in_dev_hold(in_dev); |
747 | ||
748 | if (tb[IFA_ADDRESS] == NULL) | |
749 | tb[IFA_ADDRESS] = tb[IFA_LOCAL]; | |
1da177e4 | 750 | |
fd23c3b3 | 751 | INIT_HLIST_NODE(&ifa->hash); |
1da177e4 LT |
752 | ifa->ifa_prefixlen = ifm->ifa_prefixlen; |
753 | ifa->ifa_mask = inet_make_mask(ifm->ifa_prefixlen); | |
1da177e4 LT |
754 | ifa->ifa_flags = ifm->ifa_flags; |
755 | ifa->ifa_scope = ifm->ifa_scope; | |
5c753978 TG |
756 | ifa->ifa_dev = in_dev; |
757 | ||
a7a628c4 AV |
758 | ifa->ifa_local = nla_get_be32(tb[IFA_LOCAL]); |
759 | ifa->ifa_address = nla_get_be32(tb[IFA_ADDRESS]); | |
5c753978 TG |
760 | |
761 | if (tb[IFA_BROADCAST]) | |
a7a628c4 | 762 | ifa->ifa_broadcast = nla_get_be32(tb[IFA_BROADCAST]); |
5c753978 | 763 | |
5c753978 TG |
764 | if (tb[IFA_LABEL]) |
765 | nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ); | |
1da177e4 LT |
766 | else |
767 | memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); | |
768 | ||
5c766d64 JP |
769 | if (tb[IFA_CACHEINFO]) { |
770 | struct ifa_cacheinfo *ci; | |
771 | ||
772 | ci = nla_data(tb[IFA_CACHEINFO]); | |
773 | if (!ci->ifa_valid || ci->ifa_prefered > ci->ifa_valid) { | |
774 | err = -EINVAL; | |
b4f55925 | 775 | goto errout_free; |
5c766d64 JP |
776 | } |
777 | *pvalid_lft = ci->ifa_valid; | |
778 | *pprefered_lft = ci->ifa_prefered; | |
779 | } | |
780 | ||
5c753978 TG |
781 | return ifa; |
782 | ||
b4f55925 DB |
783 | errout_free: |
784 | inet_free_ifa(ifa); | |
5c753978 TG |
785 | errout: |
786 | return ERR_PTR(err); | |
787 | } | |
788 | ||
5c766d64 JP |
789 | static struct in_ifaddr *find_matching_ifa(struct in_ifaddr *ifa) |
790 | { | |
791 | struct in_device *in_dev = ifa->ifa_dev; | |
792 | struct in_ifaddr *ifa1, **ifap; | |
793 | ||
794 | if (!ifa->ifa_local) | |
795 | return NULL; | |
796 | ||
797 | for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL; | |
798 | ifap = &ifa1->ifa_next) { | |
799 | if (ifa1->ifa_mask == ifa->ifa_mask && | |
800 | inet_ifa_match(ifa1->ifa_address, ifa) && | |
801 | ifa1->ifa_local == ifa->ifa_local) | |
802 | return ifa1; | |
803 | } | |
804 | return NULL; | |
805 | } | |
806 | ||
661d2967 | 807 | static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh) |
5c753978 | 808 | { |
3b1e0a65 | 809 | struct net *net = sock_net(skb->sk); |
5c753978 | 810 | struct in_ifaddr *ifa; |
5c766d64 JP |
811 | struct in_ifaddr *ifa_existing; |
812 | __u32 valid_lft = INFINITY_LIFE_TIME; | |
813 | __u32 prefered_lft = INFINITY_LIFE_TIME; | |
5c753978 TG |
814 | |
815 | ASSERT_RTNL(); | |
816 | ||
5c766d64 | 817 | ifa = rtm_to_ifaddr(net, nlh, &valid_lft, &prefered_lft); |
5c753978 TG |
818 | if (IS_ERR(ifa)) |
819 | return PTR_ERR(ifa); | |
820 | ||
5c766d64 JP |
821 | ifa_existing = find_matching_ifa(ifa); |
822 | if (!ifa_existing) { | |
823 | /* It would be best to check for !NLM_F_CREATE here but | |
824 | * userspace alreay relies on not having to provide this. | |
825 | */ | |
826 | set_ifa_lifetime(ifa, valid_lft, prefered_lft); | |
827 | return __inet_insert_ifa(ifa, nlh, NETLINK_CB(skb).portid); | |
828 | } else { | |
829 | inet_free_ifa(ifa); | |
830 | ||
831 | if (nlh->nlmsg_flags & NLM_F_EXCL || | |
832 | !(nlh->nlmsg_flags & NLM_F_REPLACE)) | |
833 | return -EEXIST; | |
34e2ed34 JP |
834 | ifa = ifa_existing; |
835 | set_ifa_lifetime(ifa, valid_lft, prefered_lft); | |
05a324b9 JP |
836 | cancel_delayed_work(&check_lifetime_work); |
837 | schedule_delayed_work(&check_lifetime_work, 0); | |
34e2ed34 JP |
838 | rtmsg_ifa(RTM_NEWADDR, ifa, nlh, NETLINK_CB(skb).portid); |
839 | blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa); | |
5c766d64 JP |
840 | } |
841 | return 0; | |
1da177e4 LT |
842 | } |
843 | ||
844 | /* | |
845 | * Determine a default network mask, based on the IP address. | |
846 | */ | |
847 | ||
40384999 | 848 | static int inet_abc_len(__be32 addr) |
1da177e4 LT |
849 | { |
850 | int rc = -1; /* Something else, probably a multicast. */ | |
851 | ||
f97c1e0c | 852 | if (ipv4_is_zeronet(addr)) |
e905a9ed | 853 | rc = 0; |
1da177e4 | 854 | else { |
714e85be | 855 | __u32 haddr = ntohl(addr); |
1da177e4 | 856 | |
714e85be | 857 | if (IN_CLASSA(haddr)) |
1da177e4 | 858 | rc = 8; |
714e85be | 859 | else if (IN_CLASSB(haddr)) |
1da177e4 | 860 | rc = 16; |
714e85be | 861 | else if (IN_CLASSC(haddr)) |
1da177e4 LT |
862 | rc = 24; |
863 | } | |
864 | ||
e905a9ed | 865 | return rc; |
1da177e4 LT |
866 | } |
867 | ||
868 | ||
e5b13cb1 | 869 | int devinet_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
1da177e4 LT |
870 | { |
871 | struct ifreq ifr; | |
872 | struct sockaddr_in sin_orig; | |
873 | struct sockaddr_in *sin = (struct sockaddr_in *)&ifr.ifr_addr; | |
874 | struct in_device *in_dev; | |
875 | struct in_ifaddr **ifap = NULL; | |
876 | struct in_ifaddr *ifa = NULL; | |
877 | struct net_device *dev; | |
878 | char *colon; | |
879 | int ret = -EFAULT; | |
880 | int tryaddrmatch = 0; | |
881 | ||
882 | /* | |
883 | * Fetch the caller's info block into kernel space | |
884 | */ | |
885 | ||
886 | if (copy_from_user(&ifr, arg, sizeof(struct ifreq))) | |
887 | goto out; | |
888 | ifr.ifr_name[IFNAMSIZ - 1] = 0; | |
889 | ||
890 | /* save original address for comparison */ | |
891 | memcpy(&sin_orig, sin, sizeof(*sin)); | |
892 | ||
893 | colon = strchr(ifr.ifr_name, ':'); | |
894 | if (colon) | |
895 | *colon = 0; | |
896 | ||
e5b13cb1 | 897 | dev_load(net, ifr.ifr_name); |
1da177e4 | 898 | |
132adf54 | 899 | switch (cmd) { |
1da177e4 LT |
900 | case SIOCGIFADDR: /* Get interface address */ |
901 | case SIOCGIFBRDADDR: /* Get the broadcast address */ | |
902 | case SIOCGIFDSTADDR: /* Get the destination address */ | |
903 | case SIOCGIFNETMASK: /* Get the netmask for the interface */ | |
904 | /* Note that these ioctls will not sleep, | |
905 | so that we do not impose a lock. | |
906 | One day we will be forced to put shlock here (I mean SMP) | |
907 | */ | |
908 | tryaddrmatch = (sin_orig.sin_family == AF_INET); | |
909 | memset(sin, 0, sizeof(*sin)); | |
910 | sin->sin_family = AF_INET; | |
911 | break; | |
912 | ||
913 | case SIOCSIFFLAGS: | |
bf5b30b8 | 914 | ret = -EPERM; |
52e804c6 | 915 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
916 | goto out; |
917 | break; | |
918 | case SIOCSIFADDR: /* Set interface address (and family) */ | |
919 | case SIOCSIFBRDADDR: /* Set the broadcast address */ | |
920 | case SIOCSIFDSTADDR: /* Set the destination address */ | |
921 | case SIOCSIFNETMASK: /* Set the netmask for the interface */ | |
6fa3eb70 | 922 | case SIOCKILLADDR: /* Nuke all sockets on this address */ |
bf5b30b8 | 923 | ret = -EPERM; |
52e804c6 | 924 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
925 | goto out; |
926 | ret = -EINVAL; | |
927 | if (sin->sin_family != AF_INET) | |
928 | goto out; | |
929 | break; | |
930 | default: | |
931 | ret = -EINVAL; | |
932 | goto out; | |
933 | } | |
934 | ||
935 | rtnl_lock(); | |
936 | ||
937 | ret = -ENODEV; | |
9f9354b9 ED |
938 | dev = __dev_get_by_name(net, ifr.ifr_name); |
939 | if (!dev) | |
1da177e4 LT |
940 | goto done; |
941 | ||
942 | if (colon) | |
943 | *colon = ':'; | |
944 | ||
9f9354b9 ED |
945 | in_dev = __in_dev_get_rtnl(dev); |
946 | if (in_dev) { | |
1da177e4 LT |
947 | if (tryaddrmatch) { |
948 | /* Matthias Andree */ | |
949 | /* compare label and address (4.4BSD style) */ | |
950 | /* note: we only do this for a limited set of ioctls | |
951 | and only if the original address family was AF_INET. | |
952 | This is checked above. */ | |
953 | for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; | |
954 | ifap = &ifa->ifa_next) { | |
955 | if (!strcmp(ifr.ifr_name, ifa->ifa_label) && | |
956 | sin_orig.sin_addr.s_addr == | |
6c91afe1 | 957 | ifa->ifa_local) { |
1da177e4 LT |
958 | break; /* found */ |
959 | } | |
960 | } | |
961 | } | |
962 | /* we didn't get a match, maybe the application is | |
963 | 4.3BSD-style and passed in junk so we fall back to | |
964 | comparing just the label */ | |
965 | if (!ifa) { | |
966 | for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; | |
967 | ifap = &ifa->ifa_next) | |
968 | if (!strcmp(ifr.ifr_name, ifa->ifa_label)) | |
969 | break; | |
970 | } | |
971 | } | |
972 | ||
973 | ret = -EADDRNOTAVAIL; | |
6fa3eb70 S |
974 | if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS |
975 | && cmd != SIOCKILLADDR) | |
1da177e4 LT |
976 | goto done; |
977 | ||
132adf54 | 978 | switch (cmd) { |
1da177e4 LT |
979 | case SIOCGIFADDR: /* Get interface address */ |
980 | sin->sin_addr.s_addr = ifa->ifa_local; | |
981 | goto rarok; | |
982 | ||
983 | case SIOCGIFBRDADDR: /* Get the broadcast address */ | |
984 | sin->sin_addr.s_addr = ifa->ifa_broadcast; | |
985 | goto rarok; | |
986 | ||
987 | case SIOCGIFDSTADDR: /* Get the destination address */ | |
988 | sin->sin_addr.s_addr = ifa->ifa_address; | |
989 | goto rarok; | |
990 | ||
991 | case SIOCGIFNETMASK: /* Get the netmask for the interface */ | |
992 | sin->sin_addr.s_addr = ifa->ifa_mask; | |
993 | goto rarok; | |
994 | ||
995 | case SIOCSIFFLAGS: | |
996 | if (colon) { | |
997 | ret = -EADDRNOTAVAIL; | |
998 | if (!ifa) | |
999 | break; | |
1000 | ret = 0; | |
1001 | if (!(ifr.ifr_flags & IFF_UP)) | |
1002 | inet_del_ifa(in_dev, ifap, 1); | |
1003 | break; | |
1004 | } | |
1005 | ret = dev_change_flags(dev, ifr.ifr_flags); | |
1006 | break; | |
1007 | ||
1008 | case SIOCSIFADDR: /* Set interface address (and family) */ | |
1009 | ret = -EINVAL; | |
1010 | if (inet_abc_len(sin->sin_addr.s_addr) < 0) | |
1011 | break; | |
1012 | ||
1013 | if (!ifa) { | |
1014 | ret = -ENOBUFS; | |
9f9354b9 ED |
1015 | ifa = inet_alloc_ifa(); |
1016 | if (!ifa) | |
1da177e4 | 1017 | break; |
c7e2e1d7 | 1018 | INIT_HLIST_NODE(&ifa->hash); |
1da177e4 LT |
1019 | if (colon) |
1020 | memcpy(ifa->ifa_label, ifr.ifr_name, IFNAMSIZ); | |
1021 | else | |
1022 | memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); | |
1023 | } else { | |
1024 | ret = 0; | |
1025 | if (ifa->ifa_local == sin->sin_addr.s_addr) | |
1026 | break; | |
1027 | inet_del_ifa(in_dev, ifap, 0); | |
1028 | ifa->ifa_broadcast = 0; | |
148f9729 | 1029 | ifa->ifa_scope = 0; |
1da177e4 LT |
1030 | } |
1031 | ||
1032 | ifa->ifa_address = ifa->ifa_local = sin->sin_addr.s_addr; | |
1033 | ||
1034 | if (!(dev->flags & IFF_POINTOPOINT)) { | |
1035 | ifa->ifa_prefixlen = inet_abc_len(ifa->ifa_address); | |
1036 | ifa->ifa_mask = inet_make_mask(ifa->ifa_prefixlen); | |
1037 | if ((dev->flags & IFF_BROADCAST) && | |
1038 | ifa->ifa_prefixlen < 31) | |
1039 | ifa->ifa_broadcast = ifa->ifa_address | | |
1040 | ~ifa->ifa_mask; | |
1041 | } else { | |
1042 | ifa->ifa_prefixlen = 32; | |
1043 | ifa->ifa_mask = inet_make_mask(32); | |
1044 | } | |
5c766d64 | 1045 | set_ifa_lifetime(ifa, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); |
1da177e4 LT |
1046 | ret = inet_set_ifa(dev, ifa); |
1047 | break; | |
1048 | ||
1049 | case SIOCSIFBRDADDR: /* Set the broadcast address */ | |
1050 | ret = 0; | |
1051 | if (ifa->ifa_broadcast != sin->sin_addr.s_addr) { | |
1052 | inet_del_ifa(in_dev, ifap, 0); | |
1053 | ifa->ifa_broadcast = sin->sin_addr.s_addr; | |
1054 | inet_insert_ifa(ifa); | |
1055 | } | |
1056 | break; | |
1057 | ||
1058 | case SIOCSIFDSTADDR: /* Set the destination address */ | |
1059 | ret = 0; | |
1060 | if (ifa->ifa_address == sin->sin_addr.s_addr) | |
1061 | break; | |
1062 | ret = -EINVAL; | |
1063 | if (inet_abc_len(sin->sin_addr.s_addr) < 0) | |
1064 | break; | |
1065 | ret = 0; | |
1066 | inet_del_ifa(in_dev, ifap, 0); | |
1067 | ifa->ifa_address = sin->sin_addr.s_addr; | |
1068 | inet_insert_ifa(ifa); | |
1069 | break; | |
1070 | ||
1071 | case SIOCSIFNETMASK: /* Set the netmask for the interface */ | |
1072 | ||
1073 | /* | |
1074 | * The mask we set must be legal. | |
1075 | */ | |
1076 | ret = -EINVAL; | |
1077 | if (bad_mask(sin->sin_addr.s_addr, 0)) | |
1078 | break; | |
1079 | ret = 0; | |
1080 | if (ifa->ifa_mask != sin->sin_addr.s_addr) { | |
a144ea4b | 1081 | __be32 old_mask = ifa->ifa_mask; |
1da177e4 LT |
1082 | inet_del_ifa(in_dev, ifap, 0); |
1083 | ifa->ifa_mask = sin->sin_addr.s_addr; | |
1084 | ifa->ifa_prefixlen = inet_mask_len(ifa->ifa_mask); | |
1085 | ||
1086 | /* See if current broadcast address matches | |
1087 | * with current netmask, then recalculate | |
1088 | * the broadcast address. Otherwise it's a | |
1089 | * funny address, so don't touch it since | |
1090 | * the user seems to know what (s)he's doing... | |
1091 | */ | |
1092 | if ((dev->flags & IFF_BROADCAST) && | |
1093 | (ifa->ifa_prefixlen < 31) && | |
1094 | (ifa->ifa_broadcast == | |
dcab5e1e | 1095 | (ifa->ifa_local|~old_mask))) { |
1da177e4 LT |
1096 | ifa->ifa_broadcast = (ifa->ifa_local | |
1097 | ~sin->sin_addr.s_addr); | |
1098 | } | |
1099 | inet_insert_ifa(ifa); | |
1100 | } | |
1101 | break; | |
6fa3eb70 S |
1102 | case SIOCKILLADDR: /* Nuke all connections on this address */ |
1103 | ret = tcp_nuke_addr(net, (struct sockaddr *) sin); | |
1104 | break; | |
1da177e4 LT |
1105 | } |
1106 | done: | |
1107 | rtnl_unlock(); | |
1108 | out: | |
1109 | return ret; | |
1110 | rarok: | |
1111 | rtnl_unlock(); | |
1112 | ret = copy_to_user(arg, &ifr, sizeof(struct ifreq)) ? -EFAULT : 0; | |
1113 | goto out; | |
1114 | } | |
1115 | ||
1116 | static int inet_gifconf(struct net_device *dev, char __user *buf, int len) | |
1117 | { | |
e5ed6399 | 1118 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
1da177e4 LT |
1119 | struct in_ifaddr *ifa; |
1120 | struct ifreq ifr; | |
1121 | int done = 0; | |
1122 | ||
9f9354b9 | 1123 | if (!in_dev) |
1da177e4 LT |
1124 | goto out; |
1125 | ||
9f9354b9 | 1126 | for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { |
1da177e4 LT |
1127 | if (!buf) { |
1128 | done += sizeof(ifr); | |
1129 | continue; | |
1130 | } | |
1131 | if (len < (int) sizeof(ifr)) | |
1132 | break; | |
1133 | memset(&ifr, 0, sizeof(struct ifreq)); | |
1134 | if (ifa->ifa_label) | |
1135 | strcpy(ifr.ifr_name, ifa->ifa_label); | |
1136 | else | |
1137 | strcpy(ifr.ifr_name, dev->name); | |
1138 | ||
1139 | (*(struct sockaddr_in *)&ifr.ifr_addr).sin_family = AF_INET; | |
1140 | (*(struct sockaddr_in *)&ifr.ifr_addr).sin_addr.s_addr = | |
1141 | ifa->ifa_local; | |
1142 | ||
1143 | if (copy_to_user(buf, &ifr, sizeof(struct ifreq))) { | |
1144 | done = -EFAULT; | |
1145 | break; | |
1146 | } | |
1147 | buf += sizeof(struct ifreq); | |
1148 | len -= sizeof(struct ifreq); | |
1149 | done += sizeof(struct ifreq); | |
1150 | } | |
1151 | out: | |
1152 | return done; | |
1153 | } | |
1154 | ||
a61ced5d | 1155 | __be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope) |
1da177e4 | 1156 | { |
a61ced5d | 1157 | __be32 addr = 0; |
1da177e4 | 1158 | struct in_device *in_dev; |
c346dca1 | 1159 | struct net *net = dev_net(dev); |
1da177e4 LT |
1160 | |
1161 | rcu_read_lock(); | |
e5ed6399 | 1162 | in_dev = __in_dev_get_rcu(dev); |
1da177e4 LT |
1163 | if (!in_dev) |
1164 | goto no_in_dev; | |
1165 | ||
1166 | for_primary_ifa(in_dev) { | |
1167 | if (ifa->ifa_scope > scope) | |
1168 | continue; | |
1169 | if (!dst || inet_ifa_match(dst, ifa)) { | |
1170 | addr = ifa->ifa_local; | |
1171 | break; | |
1172 | } | |
1173 | if (!addr) | |
1174 | addr = ifa->ifa_local; | |
1175 | } endfor_ifa(in_dev); | |
1da177e4 LT |
1176 | |
1177 | if (addr) | |
c6d14c84 | 1178 | goto out_unlock; |
9f9354b9 | 1179 | no_in_dev: |
1da177e4 LT |
1180 | |
1181 | /* Not loopback addresses on loopback should be preferred | |
1182 | in this case. It is importnat that lo is the first interface | |
1183 | in dev_base list. | |
1184 | */ | |
c6d14c84 | 1185 | for_each_netdev_rcu(net, dev) { |
9f9354b9 ED |
1186 | in_dev = __in_dev_get_rcu(dev); |
1187 | if (!in_dev) | |
1da177e4 LT |
1188 | continue; |
1189 | ||
1190 | for_primary_ifa(in_dev) { | |
1191 | if (ifa->ifa_scope != RT_SCOPE_LINK && | |
1192 | ifa->ifa_scope <= scope) { | |
1193 | addr = ifa->ifa_local; | |
c6d14c84 | 1194 | goto out_unlock; |
1da177e4 LT |
1195 | } |
1196 | } endfor_ifa(in_dev); | |
1197 | } | |
c6d14c84 | 1198 | out_unlock: |
1da177e4 | 1199 | rcu_read_unlock(); |
1da177e4 LT |
1200 | return addr; |
1201 | } | |
9f9354b9 | 1202 | EXPORT_SYMBOL(inet_select_addr); |
1da177e4 | 1203 | |
60cad5da AV |
1204 | static __be32 confirm_addr_indev(struct in_device *in_dev, __be32 dst, |
1205 | __be32 local, int scope) | |
1da177e4 LT |
1206 | { |
1207 | int same = 0; | |
a144ea4b | 1208 | __be32 addr = 0; |
1da177e4 LT |
1209 | |
1210 | for_ifa(in_dev) { | |
1211 | if (!addr && | |
1212 | (local == ifa->ifa_local || !local) && | |
1213 | ifa->ifa_scope <= scope) { | |
1214 | addr = ifa->ifa_local; | |
1215 | if (same) | |
1216 | break; | |
1217 | } | |
1218 | if (!same) { | |
1219 | same = (!local || inet_ifa_match(local, ifa)) && | |
1220 | (!dst || inet_ifa_match(dst, ifa)); | |
1221 | if (same && addr) { | |
1222 | if (local || !dst) | |
1223 | break; | |
1224 | /* Is the selected addr into dst subnet? */ | |
1225 | if (inet_ifa_match(addr, ifa)) | |
1226 | break; | |
1227 | /* No, then can we use new local src? */ | |
1228 | if (ifa->ifa_scope <= scope) { | |
1229 | addr = ifa->ifa_local; | |
1230 | break; | |
1231 | } | |
1232 | /* search for large dst subnet for addr */ | |
1233 | same = 0; | |
1234 | } | |
1235 | } | |
1236 | } endfor_ifa(in_dev); | |
1237 | ||
9f9354b9 | 1238 | return same ? addr : 0; |
1da177e4 LT |
1239 | } |
1240 | ||
1241 | /* | |
1242 | * Confirm that local IP address exists using wildcards: | |
9bd85e32 | 1243 | * - in_dev: only on this interface, 0=any interface |
1da177e4 LT |
1244 | * - dst: only in the same subnet as dst, 0=any dst |
1245 | * - local: address, 0=autoselect the local address | |
1246 | * - scope: maximum allowed scope value for the local address | |
1247 | */ | |
9bd85e32 DL |
1248 | __be32 inet_confirm_addr(struct in_device *in_dev, |
1249 | __be32 dst, __be32 local, int scope) | |
1da177e4 | 1250 | { |
60cad5da | 1251 | __be32 addr = 0; |
9bd85e32 | 1252 | struct net_device *dev; |
39a6d063 | 1253 | struct net *net; |
1da177e4 | 1254 | |
39a6d063 | 1255 | if (scope != RT_SCOPE_LINK) |
9bd85e32 | 1256 | return confirm_addr_indev(in_dev, dst, local, scope); |
1da177e4 | 1257 | |
c346dca1 | 1258 | net = dev_net(in_dev->dev); |
1da177e4 | 1259 | rcu_read_lock(); |
c6d14c84 | 1260 | for_each_netdev_rcu(net, dev) { |
9f9354b9 ED |
1261 | in_dev = __in_dev_get_rcu(dev); |
1262 | if (in_dev) { | |
1da177e4 LT |
1263 | addr = confirm_addr_indev(in_dev, dst, local, scope); |
1264 | if (addr) | |
1265 | break; | |
1266 | } | |
1267 | } | |
1268 | rcu_read_unlock(); | |
1da177e4 LT |
1269 | |
1270 | return addr; | |
1271 | } | |
eaddcd76 | 1272 | EXPORT_SYMBOL(inet_confirm_addr); |
1da177e4 LT |
1273 | |
1274 | /* | |
1275 | * Device notifier | |
1276 | */ | |
1277 | ||
1278 | int register_inetaddr_notifier(struct notifier_block *nb) | |
1279 | { | |
e041c683 | 1280 | return blocking_notifier_chain_register(&inetaddr_chain, nb); |
1da177e4 | 1281 | } |
9f9354b9 | 1282 | EXPORT_SYMBOL(register_inetaddr_notifier); |
1da177e4 LT |
1283 | |
1284 | int unregister_inetaddr_notifier(struct notifier_block *nb) | |
1285 | { | |
e041c683 | 1286 | return blocking_notifier_chain_unregister(&inetaddr_chain, nb); |
1da177e4 | 1287 | } |
9f9354b9 | 1288 | EXPORT_SYMBOL(unregister_inetaddr_notifier); |
1da177e4 | 1289 | |
9f9354b9 ED |
1290 | /* Rename ifa_labels for a device name change. Make some effort to preserve |
1291 | * existing alias numbering and to create unique labels if possible. | |
1da177e4 LT |
1292 | */ |
1293 | static void inetdev_changename(struct net_device *dev, struct in_device *in_dev) | |
e905a9ed | 1294 | { |
1da177e4 LT |
1295 | struct in_ifaddr *ifa; |
1296 | int named = 0; | |
1297 | ||
e905a9ed YH |
1298 | for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { |
1299 | char old[IFNAMSIZ], *dot; | |
1da177e4 LT |
1300 | |
1301 | memcpy(old, ifa->ifa_label, IFNAMSIZ); | |
e905a9ed | 1302 | memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); |
1da177e4 | 1303 | if (named++ == 0) |
573bf470 | 1304 | goto skip; |
44344b2a | 1305 | dot = strchr(old, ':'); |
e905a9ed YH |
1306 | if (dot == NULL) { |
1307 | sprintf(old, ":%d", named); | |
1da177e4 LT |
1308 | dot = old; |
1309 | } | |
9f9354b9 | 1310 | if (strlen(dot) + strlen(dev->name) < IFNAMSIZ) |
e905a9ed | 1311 | strcat(ifa->ifa_label, dot); |
9f9354b9 | 1312 | else |
e905a9ed | 1313 | strcpy(ifa->ifa_label + (IFNAMSIZ - strlen(dot) - 1), dot); |
573bf470 TG |
1314 | skip: |
1315 | rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0); | |
e905a9ed YH |
1316 | } |
1317 | } | |
1da177e4 | 1318 | |
40384999 | 1319 | static bool inetdev_valid_mtu(unsigned int mtu) |
06770843 BL |
1320 | { |
1321 | return mtu >= 68; | |
1322 | } | |
1323 | ||
d11327ad IC |
1324 | static void inetdev_send_gratuitous_arp(struct net_device *dev, |
1325 | struct in_device *in_dev) | |
1326 | ||
1327 | { | |
b76d0789 | 1328 | struct in_ifaddr *ifa; |
d11327ad | 1329 | |
b76d0789 ZK |
1330 | for (ifa = in_dev->ifa_list; ifa; |
1331 | ifa = ifa->ifa_next) { | |
1332 | arp_send(ARPOP_REQUEST, ETH_P_ARP, | |
1333 | ifa->ifa_local, dev, | |
1334 | ifa->ifa_local, NULL, | |
1335 | dev->dev_addr, NULL); | |
1336 | } | |
d11327ad IC |
1337 | } |
1338 | ||
1da177e4 LT |
1339 | /* Called only under RTNL semaphore */ |
1340 | ||
1341 | static int inetdev_event(struct notifier_block *this, unsigned long event, | |
1342 | void *ptr) | |
1343 | { | |
1344 | struct net_device *dev = ptr; | |
748e2d93 | 1345 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
0115e8e3 | 1346 | |
1da177e4 LT |
1347 | ASSERT_RTNL(); |
1348 | ||
1349 | if (!in_dev) { | |
8030f544 | 1350 | if (event == NETDEV_REGISTER) { |
1da177e4 | 1351 | in_dev = inetdev_init(dev); |
b217d616 HX |
1352 | if (!in_dev) |
1353 | return notifier_from_errno(-ENOMEM); | |
0cc217e1 | 1354 | if (dev->flags & IFF_LOOPBACK) { |
42f811b8 HX |
1355 | IN_DEV_CONF_SET(in_dev, NOXFRM, 1); |
1356 | IN_DEV_CONF_SET(in_dev, NOPOLICY, 1); | |
8030f544 | 1357 | } |
06770843 BL |
1358 | } else if (event == NETDEV_CHANGEMTU) { |
1359 | /* Re-enabling IP */ | |
1360 | if (inetdev_valid_mtu(dev->mtu)) | |
1361 | in_dev = inetdev_init(dev); | |
1da177e4 LT |
1362 | } |
1363 | goto out; | |
1364 | } | |
1365 | ||
1366 | switch (event) { | |
1367 | case NETDEV_REGISTER: | |
91df42be | 1368 | pr_debug("%s: bug\n", __func__); |
a9b3cd7f | 1369 | RCU_INIT_POINTER(dev->ip_ptr, NULL); |
1da177e4 LT |
1370 | break; |
1371 | case NETDEV_UP: | |
06770843 | 1372 | if (!inetdev_valid_mtu(dev->mtu)) |
1da177e4 | 1373 | break; |
0cc217e1 | 1374 | if (dev->flags & IFF_LOOPBACK) { |
9f9354b9 ED |
1375 | struct in_ifaddr *ifa = inet_alloc_ifa(); |
1376 | ||
1377 | if (ifa) { | |
fd23c3b3 | 1378 | INIT_HLIST_NODE(&ifa->hash); |
1da177e4 LT |
1379 | ifa->ifa_local = |
1380 | ifa->ifa_address = htonl(INADDR_LOOPBACK); | |
1381 | ifa->ifa_prefixlen = 8; | |
1382 | ifa->ifa_mask = inet_make_mask(8); | |
1383 | in_dev_hold(in_dev); | |
1384 | ifa->ifa_dev = in_dev; | |
1385 | ifa->ifa_scope = RT_SCOPE_HOST; | |
1386 | memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); | |
5c766d64 JP |
1387 | set_ifa_lifetime(ifa, INFINITY_LIFE_TIME, |
1388 | INFINITY_LIFE_TIME); | |
1da177e4 LT |
1389 | inet_insert_ifa(ifa); |
1390 | } | |
1391 | } | |
1392 | ip_mc_up(in_dev); | |
eefef1cf SH |
1393 | /* fall through */ |
1394 | case NETDEV_CHANGEADDR: | |
d11327ad IC |
1395 | if (!IN_DEV_ARP_NOTIFY(in_dev)) |
1396 | break; | |
1397 | /* fall through */ | |
1398 | case NETDEV_NOTIFY_PEERS: | |
a21090cf | 1399 | /* Send gratuitous ARP to notify of link change */ |
d11327ad | 1400 | inetdev_send_gratuitous_arp(dev, in_dev); |
1da177e4 LT |
1401 | break; |
1402 | case NETDEV_DOWN: | |
1403 | ip_mc_down(in_dev); | |
1404 | break; | |
93d9b7d7 | 1405 | case NETDEV_PRE_TYPE_CHANGE: |
75c78500 MS |
1406 | ip_mc_unmap(in_dev); |
1407 | break; | |
93d9b7d7 | 1408 | case NETDEV_POST_TYPE_CHANGE: |
75c78500 MS |
1409 | ip_mc_remap(in_dev); |
1410 | break; | |
1da177e4 | 1411 | case NETDEV_CHANGEMTU: |
06770843 | 1412 | if (inetdev_valid_mtu(dev->mtu)) |
1da177e4 | 1413 | break; |
06770843 | 1414 | /* disable IP when MTU is not enough */ |
1da177e4 LT |
1415 | case NETDEV_UNREGISTER: |
1416 | inetdev_destroy(in_dev); | |
1417 | break; | |
1418 | case NETDEV_CHANGENAME: | |
1419 | /* Do not notify about label change, this event is | |
1420 | * not interesting to applications using netlink. | |
1421 | */ | |
1422 | inetdev_changename(dev, in_dev); | |
1423 | ||
51602b2a | 1424 | devinet_sysctl_unregister(in_dev); |
66f27a52 | 1425 | devinet_sysctl_register(in_dev); |
1da177e4 LT |
1426 | break; |
1427 | } | |
1428 | out: | |
1429 | return NOTIFY_DONE; | |
1430 | } | |
1431 | ||
1432 | static struct notifier_block ip_netdev_notifier = { | |
539afedf | 1433 | .notifier_call = inetdev_event, |
1da177e4 LT |
1434 | }; |
1435 | ||
40384999 | 1436 | static size_t inet_nlmsg_size(void) |
339bf98f TG |
1437 | { |
1438 | return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) | |
1439 | + nla_total_size(4) /* IFA_ADDRESS */ | |
1440 | + nla_total_size(4) /* IFA_LOCAL */ | |
1441 | + nla_total_size(4) /* IFA_BROADCAST */ | |
cb58d094 GU |
1442 | + nla_total_size(IFNAMSIZ) /* IFA_LABEL */ |
1443 | + nla_total_size(sizeof(struct ifa_cacheinfo)); /* IFA_CACHEINFO */ | |
339bf98f TG |
1444 | } |
1445 | ||
5c766d64 JP |
1446 | static inline u32 cstamp_delta(unsigned long cstamp) |
1447 | { | |
1448 | return (cstamp - INITIAL_JIFFIES) * 100UL / HZ; | |
1449 | } | |
1450 | ||
1451 | static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, | |
1452 | unsigned long tstamp, u32 preferred, u32 valid) | |
1453 | { | |
1454 | struct ifa_cacheinfo ci; | |
1455 | ||
1456 | ci.cstamp = cstamp_delta(cstamp); | |
1457 | ci.tstamp = cstamp_delta(tstamp); | |
1458 | ci.ifa_prefered = preferred; | |
1459 | ci.ifa_valid = valid; | |
1460 | ||
1461 | return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); | |
1462 | } | |
1463 | ||
1da177e4 | 1464 | static int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa, |
15e47304 | 1465 | u32 portid, u32 seq, int event, unsigned int flags) |
1da177e4 LT |
1466 | { |
1467 | struct ifaddrmsg *ifm; | |
1468 | struct nlmsghdr *nlh; | |
5c766d64 | 1469 | u32 preferred, valid; |
1da177e4 | 1470 | |
15e47304 | 1471 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*ifm), flags); |
47f68512 | 1472 | if (nlh == NULL) |
26932566 | 1473 | return -EMSGSIZE; |
47f68512 TG |
1474 | |
1475 | ifm = nlmsg_data(nlh); | |
1da177e4 LT |
1476 | ifm->ifa_family = AF_INET; |
1477 | ifm->ifa_prefixlen = ifa->ifa_prefixlen; | |
5c766d64 | 1478 | ifm->ifa_flags = ifa->ifa_flags; |
1da177e4 LT |
1479 | ifm->ifa_scope = ifa->ifa_scope; |
1480 | ifm->ifa_index = ifa->ifa_dev->dev->ifindex; | |
47f68512 | 1481 | |
5c766d64 JP |
1482 | if (!(ifm->ifa_flags & IFA_F_PERMANENT)) { |
1483 | preferred = ifa->ifa_preferred_lft; | |
1484 | valid = ifa->ifa_valid_lft; | |
1485 | if (preferred != INFINITY_LIFE_TIME) { | |
1486 | long tval = (jiffies - ifa->ifa_tstamp) / HZ; | |
1487 | ||
1488 | if (preferred > tval) | |
1489 | preferred -= tval; | |
1490 | else | |
1491 | preferred = 0; | |
1492 | if (valid != INFINITY_LIFE_TIME) { | |
1493 | if (valid > tval) | |
1494 | valid -= tval; | |
1495 | else | |
1496 | valid = 0; | |
1497 | } | |
1498 | } | |
1499 | } else { | |
1500 | preferred = INFINITY_LIFE_TIME; | |
1501 | valid = INFINITY_LIFE_TIME; | |
1502 | } | |
f3756b79 DM |
1503 | if ((ifa->ifa_address && |
1504 | nla_put_be32(skb, IFA_ADDRESS, ifa->ifa_address)) || | |
1505 | (ifa->ifa_local && | |
1506 | nla_put_be32(skb, IFA_LOCAL, ifa->ifa_local)) || | |
1507 | (ifa->ifa_broadcast && | |
1508 | nla_put_be32(skb, IFA_BROADCAST, ifa->ifa_broadcast)) || | |
1509 | (ifa->ifa_label[0] && | |
5c766d64 JP |
1510 | nla_put_string(skb, IFA_LABEL, ifa->ifa_label)) || |
1511 | put_cacheinfo(skb, ifa->ifa_cstamp, ifa->ifa_tstamp, | |
1512 | preferred, valid)) | |
f3756b79 | 1513 | goto nla_put_failure; |
1da177e4 | 1514 | |
47f68512 TG |
1515 | return nlmsg_end(skb, nlh); |
1516 | ||
1517 | nla_put_failure: | |
26932566 PM |
1518 | nlmsg_cancel(skb, nlh); |
1519 | return -EMSGSIZE; | |
1da177e4 LT |
1520 | } |
1521 | ||
1522 | static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) | |
1523 | { | |
3b1e0a65 | 1524 | struct net *net = sock_net(skb->sk); |
eec4df98 ED |
1525 | int h, s_h; |
1526 | int idx, s_idx; | |
1527 | int ip_idx, s_ip_idx; | |
1da177e4 LT |
1528 | struct net_device *dev; |
1529 | struct in_device *in_dev; | |
1530 | struct in_ifaddr *ifa; | |
eec4df98 | 1531 | struct hlist_head *head; |
1da177e4 | 1532 | |
eec4df98 ED |
1533 | s_h = cb->args[0]; |
1534 | s_idx = idx = cb->args[1]; | |
1535 | s_ip_idx = ip_idx = cb->args[2]; | |
1536 | ||
1537 | for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { | |
1538 | idx = 0; | |
1539 | head = &net->dev_index_head[h]; | |
1540 | rcu_read_lock(); | |
0465277f ND |
1541 | cb->seq = atomic_read(&net->ipv4.dev_addr_genid) ^ |
1542 | net->dev_base_seq; | |
b67bfe0d | 1543 | hlist_for_each_entry_rcu(dev, head, index_hlist) { |
eec4df98 ED |
1544 | if (idx < s_idx) |
1545 | goto cont; | |
4b97efdf | 1546 | if (h > s_h || idx > s_idx) |
eec4df98 ED |
1547 | s_ip_idx = 0; |
1548 | in_dev = __in_dev_get_rcu(dev); | |
1549 | if (!in_dev) | |
1550 | goto cont; | |
1da177e4 | 1551 | |
eec4df98 ED |
1552 | for (ifa = in_dev->ifa_list, ip_idx = 0; ifa; |
1553 | ifa = ifa->ifa_next, ip_idx++) { | |
1554 | if (ip_idx < s_ip_idx) | |
1555 | continue; | |
1556 | if (inet_fill_ifaddr(skb, ifa, | |
15e47304 | 1557 | NETLINK_CB(cb->skb).portid, |
1da177e4 | 1558 | cb->nlh->nlmsg_seq, |
eec4df98 ED |
1559 | RTM_NEWADDR, NLM_F_MULTI) <= 0) { |
1560 | rcu_read_unlock(); | |
1561 | goto done; | |
1562 | } | |
0465277f | 1563 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); |
eec4df98 | 1564 | } |
7562f876 | 1565 | cont: |
eec4df98 ED |
1566 | idx++; |
1567 | } | |
1568 | rcu_read_unlock(); | |
1da177e4 LT |
1569 | } |
1570 | ||
1571 | done: | |
eec4df98 ED |
1572 | cb->args[0] = h; |
1573 | cb->args[1] = idx; | |
1574 | cb->args[2] = ip_idx; | |
1da177e4 LT |
1575 | |
1576 | return skb->len; | |
1577 | } | |
1578 | ||
539afedf | 1579 | static void rtmsg_ifa(int event, struct in_ifaddr *ifa, struct nlmsghdr *nlh, |
15e47304 | 1580 | u32 portid) |
1da177e4 | 1581 | { |
47f68512 | 1582 | struct sk_buff *skb; |
d6062cbb TG |
1583 | u32 seq = nlh ? nlh->nlmsg_seq : 0; |
1584 | int err = -ENOBUFS; | |
4b8aa9ab | 1585 | struct net *net; |
1da177e4 | 1586 | |
c346dca1 | 1587 | net = dev_net(ifa->ifa_dev->dev); |
339bf98f | 1588 | skb = nlmsg_new(inet_nlmsg_size(), GFP_KERNEL); |
47f68512 | 1589 | if (skb == NULL) |
d6062cbb TG |
1590 | goto errout; |
1591 | ||
15e47304 | 1592 | err = inet_fill_ifaddr(skb, ifa, portid, seq, event, 0); |
26932566 PM |
1593 | if (err < 0) { |
1594 | /* -EMSGSIZE implies BUG in inet_nlmsg_size() */ | |
1595 | WARN_ON(err == -EMSGSIZE); | |
1596 | kfree_skb(skb); | |
1597 | goto errout; | |
1598 | } | |
15e47304 | 1599 | rtnl_notify(skb, net, portid, RTNLGRP_IPV4_IFADDR, nlh, GFP_KERNEL); |
1ce85fe4 | 1600 | return; |
d6062cbb TG |
1601 | errout: |
1602 | if (err < 0) | |
4b8aa9ab | 1603 | rtnl_set_sk_err(net, RTNLGRP_IPV4_IFADDR, err); |
1da177e4 LT |
1604 | } |
1605 | ||
9f0f7272 TG |
1606 | static size_t inet_get_link_af_size(const struct net_device *dev) |
1607 | { | |
1fc19aff | 1608 | struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr); |
9f0f7272 TG |
1609 | |
1610 | if (!in_dev) | |
1611 | return 0; | |
1612 | ||
1613 | return nla_total_size(IPV4_DEVCONF_MAX * 4); /* IFLA_INET_CONF */ | |
1614 | } | |
1615 | ||
1616 | static int inet_fill_link_af(struct sk_buff *skb, const struct net_device *dev) | |
1617 | { | |
1fc19aff | 1618 | struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr); |
9f0f7272 TG |
1619 | struct nlattr *nla; |
1620 | int i; | |
1621 | ||
1622 | if (!in_dev) | |
1623 | return -ENODATA; | |
1624 | ||
1625 | nla = nla_reserve(skb, IFLA_INET_CONF, IPV4_DEVCONF_MAX * 4); | |
1626 | if (nla == NULL) | |
1627 | return -EMSGSIZE; | |
1628 | ||
1629 | for (i = 0; i < IPV4_DEVCONF_MAX; i++) | |
1630 | ((u32 *) nla_data(nla))[i] = in_dev->cnf.data[i]; | |
1631 | ||
1632 | return 0; | |
1633 | } | |
1634 | ||
1635 | static const struct nla_policy inet_af_policy[IFLA_INET_MAX+1] = { | |
1636 | [IFLA_INET_CONF] = { .type = NLA_NESTED }, | |
1637 | }; | |
1638 | ||
cf7afbfe TG |
1639 | static int inet_validate_link_af(const struct net_device *dev, |
1640 | const struct nlattr *nla) | |
9f0f7272 | 1641 | { |
9f0f7272 TG |
1642 | struct nlattr *a, *tb[IFLA_INET_MAX+1]; |
1643 | int err, rem; | |
1644 | ||
f7fce74e | 1645 | if (dev && !__in_dev_get_rtnl(dev)) |
cf7afbfe | 1646 | return -EAFNOSUPPORT; |
9f0f7272 TG |
1647 | |
1648 | err = nla_parse_nested(tb, IFLA_INET_MAX, nla, inet_af_policy); | |
1649 | if (err < 0) | |
1650 | return err; | |
1651 | ||
1652 | if (tb[IFLA_INET_CONF]) { | |
1653 | nla_for_each_nested(a, tb[IFLA_INET_CONF], rem) { | |
1654 | int cfgid = nla_type(a); | |
1655 | ||
1656 | if (nla_len(a) < 4) | |
1657 | return -EINVAL; | |
1658 | ||
1659 | if (cfgid <= 0 || cfgid > IPV4_DEVCONF_MAX) | |
1660 | return -EINVAL; | |
1661 | } | |
1662 | } | |
1663 | ||
cf7afbfe TG |
1664 | return 0; |
1665 | } | |
1666 | ||
1667 | static int inet_set_link_af(struct net_device *dev, const struct nlattr *nla) | |
1668 | { | |
f7fce74e | 1669 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
cf7afbfe TG |
1670 | struct nlattr *a, *tb[IFLA_INET_MAX+1]; |
1671 | int rem; | |
1672 | ||
1673 | if (!in_dev) | |
1674 | return -EAFNOSUPPORT; | |
1675 | ||
1676 | if (nla_parse_nested(tb, IFLA_INET_MAX, nla, NULL) < 0) | |
1677 | BUG(); | |
1678 | ||
9f0f7272 TG |
1679 | if (tb[IFLA_INET_CONF]) { |
1680 | nla_for_each_nested(a, tb[IFLA_INET_CONF], rem) | |
1681 | ipv4_devconf_set(in_dev, nla_type(a), nla_get_u32(a)); | |
1682 | } | |
1683 | ||
1684 | return 0; | |
1685 | } | |
1686 | ||
edc9e748 ND |
1687 | static int inet_netconf_msgsize_devconf(int type) |
1688 | { | |
1689 | int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) | |
1690 | + nla_total_size(4); /* NETCONFA_IFINDEX */ | |
1691 | ||
9e551110 ND |
1692 | /* type -1 is used for ALL */ |
1693 | if (type == -1 || type == NETCONFA_FORWARDING) | |
edc9e748 | 1694 | size += nla_total_size(4); |
cc535dfb ND |
1695 | if (type == -1 || type == NETCONFA_RP_FILTER) |
1696 | size += nla_total_size(4); | |
d67b8c61 ND |
1697 | if (type == -1 || type == NETCONFA_MC_FORWARDING) |
1698 | size += nla_total_size(4); | |
edc9e748 ND |
1699 | |
1700 | return size; | |
1701 | } | |
1702 | ||
1703 | static int inet_netconf_fill_devconf(struct sk_buff *skb, int ifindex, | |
1704 | struct ipv4_devconf *devconf, u32 portid, | |
1705 | u32 seq, int event, unsigned int flags, | |
1706 | int type) | |
1707 | { | |
1708 | struct nlmsghdr *nlh; | |
1709 | struct netconfmsg *ncm; | |
1710 | ||
1711 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), | |
1712 | flags); | |
1713 | if (nlh == NULL) | |
1714 | return -EMSGSIZE; | |
1715 | ||
1716 | ncm = nlmsg_data(nlh); | |
1717 | ncm->ncm_family = AF_INET; | |
1718 | ||
1719 | if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0) | |
1720 | goto nla_put_failure; | |
1721 | ||
9e551110 ND |
1722 | /* type -1 is used for ALL */ |
1723 | if ((type == -1 || type == NETCONFA_FORWARDING) && | |
edc9e748 ND |
1724 | nla_put_s32(skb, NETCONFA_FORWARDING, |
1725 | IPV4_DEVCONF(*devconf, FORWARDING)) < 0) | |
1726 | goto nla_put_failure; | |
cc535dfb ND |
1727 | if ((type == -1 || type == NETCONFA_RP_FILTER) && |
1728 | nla_put_s32(skb, NETCONFA_RP_FILTER, | |
1729 | IPV4_DEVCONF(*devconf, RP_FILTER)) < 0) | |
1730 | goto nla_put_failure; | |
d67b8c61 ND |
1731 | if ((type == -1 || type == NETCONFA_MC_FORWARDING) && |
1732 | nla_put_s32(skb, NETCONFA_MC_FORWARDING, | |
1733 | IPV4_DEVCONF(*devconf, MC_FORWARDING)) < 0) | |
1734 | goto nla_put_failure; | |
edc9e748 ND |
1735 | |
1736 | return nlmsg_end(skb, nlh); | |
1737 | ||
1738 | nla_put_failure: | |
1739 | nlmsg_cancel(skb, nlh); | |
1740 | return -EMSGSIZE; | |
1741 | } | |
1742 | ||
d67b8c61 ND |
1743 | void inet_netconf_notify_devconf(struct net *net, int type, int ifindex, |
1744 | struct ipv4_devconf *devconf) | |
edc9e748 ND |
1745 | { |
1746 | struct sk_buff *skb; | |
1747 | int err = -ENOBUFS; | |
1748 | ||
1749 | skb = nlmsg_new(inet_netconf_msgsize_devconf(type), GFP_ATOMIC); | |
1750 | if (skb == NULL) | |
1751 | goto errout; | |
1752 | ||
1753 | err = inet_netconf_fill_devconf(skb, ifindex, devconf, 0, 0, | |
1754 | RTM_NEWNETCONF, 0, type); | |
1755 | if (err < 0) { | |
1756 | /* -EMSGSIZE implies BUG in inet_netconf_msgsize_devconf() */ | |
1757 | WARN_ON(err == -EMSGSIZE); | |
1758 | kfree_skb(skb); | |
1759 | goto errout; | |
1760 | } | |
1761 | rtnl_notify(skb, net, 0, RTNLGRP_IPV4_NETCONF, NULL, GFP_ATOMIC); | |
1762 | return; | |
1763 | errout: | |
1764 | if (err < 0) | |
1765 | rtnl_set_sk_err(net, RTNLGRP_IPV4_NETCONF, err); | |
1766 | } | |
1767 | ||
9e551110 ND |
1768 | static const struct nla_policy devconf_ipv4_policy[NETCONFA_MAX+1] = { |
1769 | [NETCONFA_IFINDEX] = { .len = sizeof(int) }, | |
1770 | [NETCONFA_FORWARDING] = { .len = sizeof(int) }, | |
cc535dfb | 1771 | [NETCONFA_RP_FILTER] = { .len = sizeof(int) }, |
9e551110 ND |
1772 | }; |
1773 | ||
1774 | static int inet_netconf_get_devconf(struct sk_buff *in_skb, | |
661d2967 | 1775 | struct nlmsghdr *nlh) |
9e551110 ND |
1776 | { |
1777 | struct net *net = sock_net(in_skb->sk); | |
1778 | struct nlattr *tb[NETCONFA_MAX+1]; | |
1779 | struct netconfmsg *ncm; | |
1780 | struct sk_buff *skb; | |
1781 | struct ipv4_devconf *devconf; | |
1782 | struct in_device *in_dev; | |
1783 | struct net_device *dev; | |
1784 | int ifindex; | |
1785 | int err; | |
1786 | ||
1787 | err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX, | |
1788 | devconf_ipv4_policy); | |
1789 | if (err < 0) | |
1790 | goto errout; | |
1791 | ||
1792 | err = EINVAL; | |
1793 | if (!tb[NETCONFA_IFINDEX]) | |
1794 | goto errout; | |
1795 | ||
1796 | ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); | |
1797 | switch (ifindex) { | |
1798 | case NETCONFA_IFINDEX_ALL: | |
1799 | devconf = net->ipv4.devconf_all; | |
1800 | break; | |
1801 | case NETCONFA_IFINDEX_DEFAULT: | |
1802 | devconf = net->ipv4.devconf_dflt; | |
1803 | break; | |
1804 | default: | |
1805 | dev = __dev_get_by_index(net, ifindex); | |
1806 | if (dev == NULL) | |
1807 | goto errout; | |
1808 | in_dev = __in_dev_get_rtnl(dev); | |
1809 | if (in_dev == NULL) | |
1810 | goto errout; | |
1811 | devconf = &in_dev->cnf; | |
1812 | break; | |
1813 | } | |
1814 | ||
1815 | err = -ENOBUFS; | |
1816 | skb = nlmsg_new(inet_netconf_msgsize_devconf(-1), GFP_ATOMIC); | |
1817 | if (skb == NULL) | |
1818 | goto errout; | |
1819 | ||
1820 | err = inet_netconf_fill_devconf(skb, ifindex, devconf, | |
1821 | NETLINK_CB(in_skb).portid, | |
1822 | nlh->nlmsg_seq, RTM_NEWNETCONF, 0, | |
1823 | -1); | |
1824 | if (err < 0) { | |
1825 | /* -EMSGSIZE implies BUG in inet_netconf_msgsize_devconf() */ | |
1826 | WARN_ON(err == -EMSGSIZE); | |
1827 | kfree_skb(skb); | |
1828 | goto errout; | |
1829 | } | |
1830 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); | |
1831 | errout: | |
1832 | return err; | |
1833 | } | |
1834 | ||
7a674200 ND |
1835 | static int inet_netconf_dump_devconf(struct sk_buff *skb, |
1836 | struct netlink_callback *cb) | |
1837 | { | |
1838 | struct net *net = sock_net(skb->sk); | |
1839 | int h, s_h; | |
1840 | int idx, s_idx; | |
1841 | struct net_device *dev; | |
1842 | struct in_device *in_dev; | |
1843 | struct hlist_head *head; | |
1844 | ||
1845 | s_h = cb->args[0]; | |
1846 | s_idx = idx = cb->args[1]; | |
1847 | ||
1848 | for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { | |
1849 | idx = 0; | |
1850 | head = &net->dev_index_head[h]; | |
1851 | rcu_read_lock(); | |
0465277f ND |
1852 | cb->seq = atomic_read(&net->ipv4.dev_addr_genid) ^ |
1853 | net->dev_base_seq; | |
7a674200 ND |
1854 | hlist_for_each_entry_rcu(dev, head, index_hlist) { |
1855 | if (idx < s_idx) | |
1856 | goto cont; | |
1857 | in_dev = __in_dev_get_rcu(dev); | |
1858 | if (!in_dev) | |
1859 | goto cont; | |
1860 | ||
1861 | if (inet_netconf_fill_devconf(skb, dev->ifindex, | |
1862 | &in_dev->cnf, | |
1863 | NETLINK_CB(cb->skb).portid, | |
1864 | cb->nlh->nlmsg_seq, | |
1865 | RTM_NEWNETCONF, | |
1866 | NLM_F_MULTI, | |
1867 | -1) <= 0) { | |
1868 | rcu_read_unlock(); | |
1869 | goto done; | |
1870 | } | |
0465277f | 1871 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); |
7a674200 ND |
1872 | cont: |
1873 | idx++; | |
1874 | } | |
1875 | rcu_read_unlock(); | |
1876 | } | |
1877 | if (h == NETDEV_HASHENTRIES) { | |
1878 | if (inet_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL, | |
1879 | net->ipv4.devconf_all, | |
1880 | NETLINK_CB(cb->skb).portid, | |
1881 | cb->nlh->nlmsg_seq, | |
1882 | RTM_NEWNETCONF, NLM_F_MULTI, | |
1883 | -1) <= 0) | |
1884 | goto done; | |
1885 | else | |
1886 | h++; | |
1887 | } | |
1888 | if (h == NETDEV_HASHENTRIES + 1) { | |
1889 | if (inet_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT, | |
1890 | net->ipv4.devconf_dflt, | |
1891 | NETLINK_CB(cb->skb).portid, | |
1892 | cb->nlh->nlmsg_seq, | |
1893 | RTM_NEWNETCONF, NLM_F_MULTI, | |
1894 | -1) <= 0) | |
1895 | goto done; | |
1896 | else | |
1897 | h++; | |
1898 | } | |
1899 | done: | |
1900 | cb->args[0] = h; | |
1901 | cb->args[1] = idx; | |
1902 | ||
1903 | return skb->len; | |
1904 | } | |
1905 | ||
1da177e4 LT |
1906 | #ifdef CONFIG_SYSCTL |
1907 | ||
c0ce9fb3 | 1908 | static void devinet_copy_dflt_conf(struct net *net, int i) |
31be3085 HX |
1909 | { |
1910 | struct net_device *dev; | |
1911 | ||
c6d14c84 ED |
1912 | rcu_read_lock(); |
1913 | for_each_netdev_rcu(net, dev) { | |
31be3085 | 1914 | struct in_device *in_dev; |
c6d14c84 | 1915 | |
31be3085 HX |
1916 | in_dev = __in_dev_get_rcu(dev); |
1917 | if (in_dev && !test_bit(i, in_dev->cnf.state)) | |
9355bbd6 | 1918 | in_dev->cnf.data[i] = net->ipv4.devconf_dflt->data[i]; |
31be3085 | 1919 | } |
c6d14c84 | 1920 | rcu_read_unlock(); |
31be3085 HX |
1921 | } |
1922 | ||
c6d14c84 | 1923 | /* called with RTNL locked */ |
c0ce9fb3 | 1924 | static void inet_forward_change(struct net *net) |
68dd299b PE |
1925 | { |
1926 | struct net_device *dev; | |
586f1211 | 1927 | int on = IPV4_DEVCONF_ALL(net, FORWARDING); |
68dd299b | 1928 | |
586f1211 | 1929 | IPV4_DEVCONF_ALL(net, ACCEPT_REDIRECTS) = !on; |
9355bbd6 | 1930 | IPV4_DEVCONF_DFLT(net, FORWARDING) = on; |
edc9e748 ND |
1931 | inet_netconf_notify_devconf(net, NETCONFA_FORWARDING, |
1932 | NETCONFA_IFINDEX_ALL, | |
1933 | net->ipv4.devconf_all); | |
1934 | inet_netconf_notify_devconf(net, NETCONFA_FORWARDING, | |
1935 | NETCONFA_IFINDEX_DEFAULT, | |
1936 | net->ipv4.devconf_dflt); | |
68dd299b | 1937 | |
c0ce9fb3 | 1938 | for_each_netdev(net, dev) { |
68dd299b | 1939 | struct in_device *in_dev; |
0187bdfb BH |
1940 | if (on) |
1941 | dev_disable_lro(dev); | |
68dd299b PE |
1942 | rcu_read_lock(); |
1943 | in_dev = __in_dev_get_rcu(dev); | |
edc9e748 | 1944 | if (in_dev) { |
68dd299b | 1945 | IN_DEV_CONF_SET(in_dev, FORWARDING, on); |
edc9e748 ND |
1946 | inet_netconf_notify_devconf(net, NETCONFA_FORWARDING, |
1947 | dev->ifindex, &in_dev->cnf); | |
1948 | } | |
68dd299b PE |
1949 | rcu_read_unlock(); |
1950 | } | |
68dd299b PE |
1951 | } |
1952 | ||
31be3085 | 1953 | static int devinet_conf_proc(ctl_table *ctl, int write, |
8d65af78 | 1954 | void __user *buffer, |
31be3085 HX |
1955 | size_t *lenp, loff_t *ppos) |
1956 | { | |
d01ff0a0 | 1957 | int old_value = *(int *)ctl->data; |
8d65af78 | 1958 | int ret = proc_dointvec(ctl, write, buffer, lenp, ppos); |
d01ff0a0 | 1959 | int new_value = *(int *)ctl->data; |
31be3085 HX |
1960 | |
1961 | if (write) { | |
1962 | struct ipv4_devconf *cnf = ctl->extra1; | |
c0ce9fb3 | 1963 | struct net *net = ctl->extra2; |
31be3085 HX |
1964 | int i = (int *)ctl->data - cnf->data; |
1965 | ||
1966 | set_bit(i, cnf->state); | |
1967 | ||
9355bbd6 | 1968 | if (cnf == net->ipv4.devconf_dflt) |
c0ce9fb3 | 1969 | devinet_copy_dflt_conf(net, i); |
d0daebc3 TG |
1970 | if (i == IPV4_DEVCONF_ACCEPT_LOCAL - 1 || |
1971 | i == IPV4_DEVCONF_ROUTE_LOCALNET - 1) | |
d01ff0a0 | 1972 | if ((new_value == 0) && (old_value != 0)) |
4ccfe6d4 | 1973 | rt_cache_flush(net); |
cc535dfb ND |
1974 | if (i == IPV4_DEVCONF_RP_FILTER - 1 && |
1975 | new_value != old_value) { | |
1976 | int ifindex; | |
1977 | ||
1978 | if (cnf == net->ipv4.devconf_dflt) | |
1979 | ifindex = NETCONFA_IFINDEX_DEFAULT; | |
1980 | else if (cnf == net->ipv4.devconf_all) | |
1981 | ifindex = NETCONFA_IFINDEX_ALL; | |
1982 | else { | |
1983 | struct in_device *idev = | |
1984 | container_of(cnf, struct in_device, | |
1985 | cnf); | |
1986 | ifindex = idev->dev->ifindex; | |
1987 | } | |
1988 | inet_netconf_notify_devconf(net, NETCONFA_RP_FILTER, | |
1989 | ifindex, cnf); | |
1990 | } | |
31be3085 HX |
1991 | } |
1992 | ||
1993 | return ret; | |
1994 | } | |
1995 | ||
1da177e4 | 1996 | static int devinet_sysctl_forward(ctl_table *ctl, int write, |
8d65af78 | 1997 | void __user *buffer, |
1da177e4 LT |
1998 | size_t *lenp, loff_t *ppos) |
1999 | { | |
2000 | int *valp = ctl->data; | |
2001 | int val = *valp; | |
88af182e | 2002 | loff_t pos = *ppos; |
8d65af78 | 2003 | int ret = proc_dointvec(ctl, write, buffer, lenp, ppos); |
1da177e4 LT |
2004 | |
2005 | if (write && *valp != val) { | |
c0ce9fb3 PE |
2006 | struct net *net = ctl->extra2; |
2007 | ||
0187bdfb | 2008 | if (valp != &IPV4_DEVCONF_DFLT(net, FORWARDING)) { |
88af182e EB |
2009 | if (!rtnl_trylock()) { |
2010 | /* Restore the original values before restarting */ | |
2011 | *valp = val; | |
2012 | *ppos = pos; | |
9b8adb5e | 2013 | return restart_syscall(); |
88af182e | 2014 | } |
0187bdfb BH |
2015 | if (valp == &IPV4_DEVCONF_ALL(net, FORWARDING)) { |
2016 | inet_forward_change(net); | |
edc9e748 | 2017 | } else { |
0187bdfb BH |
2018 | struct ipv4_devconf *cnf = ctl->extra1; |
2019 | struct in_device *idev = | |
2020 | container_of(cnf, struct in_device, cnf); | |
edc9e748 ND |
2021 | if (*valp) |
2022 | dev_disable_lro(idev->dev); | |
2023 | inet_netconf_notify_devconf(net, | |
2024 | NETCONFA_FORWARDING, | |
2025 | idev->dev->ifindex, | |
2026 | cnf); | |
0187bdfb BH |
2027 | } |
2028 | rtnl_unlock(); | |
4ccfe6d4 | 2029 | rt_cache_flush(net); |
edc9e748 ND |
2030 | } else |
2031 | inet_netconf_notify_devconf(net, NETCONFA_FORWARDING, | |
2032 | NETCONFA_IFINDEX_DEFAULT, | |
2033 | net->ipv4.devconf_dflt); | |
1da177e4 LT |
2034 | } |
2035 | ||
2036 | return ret; | |
2037 | } | |
2038 | ||
323e126f DM |
2039 | static int ipv4_doint_and_flush(ctl_table *ctl, int write, |
2040 | void __user *buffer, | |
2041 | size_t *lenp, loff_t *ppos) | |
1da177e4 LT |
2042 | { |
2043 | int *valp = ctl->data; | |
2044 | int val = *valp; | |
8d65af78 | 2045 | int ret = proc_dointvec(ctl, write, buffer, lenp, ppos); |
76e6ebfb | 2046 | struct net *net = ctl->extra2; |
1da177e4 LT |
2047 | |
2048 | if (write && *valp != val) | |
4ccfe6d4 | 2049 | rt_cache_flush(net); |
1da177e4 LT |
2050 | |
2051 | return ret; | |
2052 | } | |
2053 | ||
f8572d8f | 2054 | #define DEVINET_SYSCTL_ENTRY(attr, name, mval, proc) \ |
42f811b8 | 2055 | { \ |
42f811b8 HX |
2056 | .procname = name, \ |
2057 | .data = ipv4_devconf.data + \ | |
02291680 | 2058 | IPV4_DEVCONF_ ## attr - 1, \ |
42f811b8 HX |
2059 | .maxlen = sizeof(int), \ |
2060 | .mode = mval, \ | |
2061 | .proc_handler = proc, \ | |
31be3085 | 2062 | .extra1 = &ipv4_devconf, \ |
42f811b8 HX |
2063 | } |
2064 | ||
2065 | #define DEVINET_SYSCTL_RW_ENTRY(attr, name) \ | |
f8572d8f | 2066 | DEVINET_SYSCTL_ENTRY(attr, name, 0644, devinet_conf_proc) |
42f811b8 HX |
2067 | |
2068 | #define DEVINET_SYSCTL_RO_ENTRY(attr, name) \ | |
f8572d8f | 2069 | DEVINET_SYSCTL_ENTRY(attr, name, 0444, devinet_conf_proc) |
42f811b8 | 2070 | |
f8572d8f EB |
2071 | #define DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, proc) \ |
2072 | DEVINET_SYSCTL_ENTRY(attr, name, 0644, proc) | |
42f811b8 HX |
2073 | |
2074 | #define DEVINET_SYSCTL_FLUSHING_ENTRY(attr, name) \ | |
f8572d8f | 2075 | DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, ipv4_doint_and_flush) |
42f811b8 | 2076 | |
1da177e4 LT |
2077 | static struct devinet_sysctl_table { |
2078 | struct ctl_table_header *sysctl_header; | |
02291680 | 2079 | struct ctl_table devinet_vars[__IPV4_DEVCONF_MAX]; |
1da177e4 LT |
2080 | } devinet_sysctl = { |
2081 | .devinet_vars = { | |
42f811b8 | 2082 | DEVINET_SYSCTL_COMPLEX_ENTRY(FORWARDING, "forwarding", |
f8572d8f | 2083 | devinet_sysctl_forward), |
42f811b8 HX |
2084 | DEVINET_SYSCTL_RO_ENTRY(MC_FORWARDING, "mc_forwarding"), |
2085 | ||
2086 | DEVINET_SYSCTL_RW_ENTRY(ACCEPT_REDIRECTS, "accept_redirects"), | |
2087 | DEVINET_SYSCTL_RW_ENTRY(SECURE_REDIRECTS, "secure_redirects"), | |
2088 | DEVINET_SYSCTL_RW_ENTRY(SHARED_MEDIA, "shared_media"), | |
2089 | DEVINET_SYSCTL_RW_ENTRY(RP_FILTER, "rp_filter"), | |
2090 | DEVINET_SYSCTL_RW_ENTRY(SEND_REDIRECTS, "send_redirects"), | |
2091 | DEVINET_SYSCTL_RW_ENTRY(ACCEPT_SOURCE_ROUTE, | |
2092 | "accept_source_route"), | |
8153a10c | 2093 | DEVINET_SYSCTL_RW_ENTRY(ACCEPT_LOCAL, "accept_local"), |
28f6aeea | 2094 | DEVINET_SYSCTL_RW_ENTRY(SRC_VMARK, "src_valid_mark"), |
42f811b8 HX |
2095 | DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP, "proxy_arp"), |
2096 | DEVINET_SYSCTL_RW_ENTRY(MEDIUM_ID, "medium_id"), | |
2097 | DEVINET_SYSCTL_RW_ENTRY(BOOTP_RELAY, "bootp_relay"), | |
2098 | DEVINET_SYSCTL_RW_ENTRY(LOG_MARTIANS, "log_martians"), | |
2099 | DEVINET_SYSCTL_RW_ENTRY(TAG, "tag"), | |
2100 | DEVINET_SYSCTL_RW_ENTRY(ARPFILTER, "arp_filter"), | |
2101 | DEVINET_SYSCTL_RW_ENTRY(ARP_ANNOUNCE, "arp_announce"), | |
2102 | DEVINET_SYSCTL_RW_ENTRY(ARP_IGNORE, "arp_ignore"), | |
2103 | DEVINET_SYSCTL_RW_ENTRY(ARP_ACCEPT, "arp_accept"), | |
eefef1cf | 2104 | DEVINET_SYSCTL_RW_ENTRY(ARP_NOTIFY, "arp_notify"), |
65324144 | 2105 | DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP_PVLAN, "proxy_arp_pvlan"), |
42f811b8 HX |
2106 | |
2107 | DEVINET_SYSCTL_FLUSHING_ENTRY(NOXFRM, "disable_xfrm"), | |
2108 | DEVINET_SYSCTL_FLUSHING_ENTRY(NOPOLICY, "disable_policy"), | |
2109 | DEVINET_SYSCTL_FLUSHING_ENTRY(FORCE_IGMP_VERSION, | |
2110 | "force_igmp_version"), | |
2111 | DEVINET_SYSCTL_FLUSHING_ENTRY(PROMOTE_SECONDARIES, | |
2112 | "promote_secondaries"), | |
d0daebc3 TG |
2113 | DEVINET_SYSCTL_FLUSHING_ENTRY(ROUTE_LOCALNET, |
2114 | "route_localnet"), | |
1da177e4 | 2115 | }, |
1da177e4 LT |
2116 | }; |
2117 | ||
ea40b324 | 2118 | static int __devinet_sysctl_register(struct net *net, char *dev_name, |
f8572d8f | 2119 | struct ipv4_devconf *p) |
1da177e4 LT |
2120 | { |
2121 | int i; | |
9fa89642 | 2122 | struct devinet_sysctl_table *t; |
8607ddb8 | 2123 | char path[sizeof("net/ipv4/conf/") + IFNAMSIZ]; |
bfada697 | 2124 | |
9fa89642 | 2125 | t = kmemdup(&devinet_sysctl, sizeof(*t), GFP_KERNEL); |
1da177e4 | 2126 | if (!t) |
9fa89642 PE |
2127 | goto out; |
2128 | ||
1da177e4 LT |
2129 | for (i = 0; i < ARRAY_SIZE(t->devinet_vars) - 1; i++) { |
2130 | t->devinet_vars[i].data += (char *)p - (char *)&ipv4_devconf; | |
31be3085 | 2131 | t->devinet_vars[i].extra1 = p; |
c0ce9fb3 | 2132 | t->devinet_vars[i].extra2 = net; |
1da177e4 LT |
2133 | } |
2134 | ||
8607ddb8 | 2135 | snprintf(path, sizeof(path), "net/ipv4/conf/%s", dev_name); |
1da177e4 | 2136 | |
8607ddb8 | 2137 | t->sysctl_header = register_net_sysctl(net, path, t->devinet_vars); |
1da177e4 | 2138 | if (!t->sysctl_header) |
8607ddb8 | 2139 | goto free; |
1da177e4 LT |
2140 | |
2141 | p->sysctl = t; | |
ea40b324 | 2142 | return 0; |
1da177e4 | 2143 | |
9fa89642 | 2144 | free: |
1da177e4 | 2145 | kfree(t); |
9fa89642 | 2146 | out: |
ea40b324 | 2147 | return -ENOBUFS; |
1da177e4 LT |
2148 | } |
2149 | ||
51602b2a PE |
2150 | static void __devinet_sysctl_unregister(struct ipv4_devconf *cnf) |
2151 | { | |
2152 | struct devinet_sysctl_table *t = cnf->sysctl; | |
2153 | ||
2154 | if (t == NULL) | |
2155 | return; | |
2156 | ||
2157 | cnf->sysctl = NULL; | |
ff538818 | 2158 | unregister_net_sysctl_table(t->sysctl_header); |
51602b2a PE |
2159 | kfree(t); |
2160 | } | |
2161 | ||
66f27a52 PE |
2162 | static void devinet_sysctl_register(struct in_device *idev) |
2163 | { | |
54716e3b | 2164 | neigh_sysctl_register(idev->dev, idev->arp_parms, "ipv4", NULL); |
c346dca1 | 2165 | __devinet_sysctl_register(dev_net(idev->dev), idev->dev->name, |
f8572d8f | 2166 | &idev->cnf); |
66f27a52 PE |
2167 | } |
2168 | ||
51602b2a | 2169 | static void devinet_sysctl_unregister(struct in_device *idev) |
1da177e4 | 2170 | { |
51602b2a PE |
2171 | __devinet_sysctl_unregister(&idev->cnf); |
2172 | neigh_sysctl_unregister(idev->arp_parms); | |
1da177e4 | 2173 | } |
1da177e4 | 2174 | |
68dd299b PE |
2175 | static struct ctl_table ctl_forward_entry[] = { |
2176 | { | |
68dd299b PE |
2177 | .procname = "ip_forward", |
2178 | .data = &ipv4_devconf.data[ | |
02291680 | 2179 | IPV4_DEVCONF_FORWARDING - 1], |
68dd299b PE |
2180 | .maxlen = sizeof(int), |
2181 | .mode = 0644, | |
2182 | .proc_handler = devinet_sysctl_forward, | |
68dd299b | 2183 | .extra1 = &ipv4_devconf, |
c0ce9fb3 | 2184 | .extra2 = &init_net, |
68dd299b PE |
2185 | }, |
2186 | { }, | |
2187 | }; | |
2a75de0c | 2188 | #endif |
68dd299b | 2189 | |
752d14dc PE |
2190 | static __net_init int devinet_init_net(struct net *net) |
2191 | { | |
2192 | int err; | |
752d14dc | 2193 | struct ipv4_devconf *all, *dflt; |
2a75de0c ED |
2194 | #ifdef CONFIG_SYSCTL |
2195 | struct ctl_table *tbl = ctl_forward_entry; | |
752d14dc | 2196 | struct ctl_table_header *forw_hdr; |
2a75de0c | 2197 | #endif |
752d14dc PE |
2198 | |
2199 | err = -ENOMEM; | |
2200 | all = &ipv4_devconf; | |
2201 | dflt = &ipv4_devconf_dflt; | |
752d14dc | 2202 | |
09ad9bc7 | 2203 | if (!net_eq(net, &init_net)) { |
752d14dc PE |
2204 | all = kmemdup(all, sizeof(ipv4_devconf), GFP_KERNEL); |
2205 | if (all == NULL) | |
2206 | goto err_alloc_all; | |
2207 | ||
2208 | dflt = kmemdup(dflt, sizeof(ipv4_devconf_dflt), GFP_KERNEL); | |
2209 | if (dflt == NULL) | |
2210 | goto err_alloc_dflt; | |
2211 | ||
2a75de0c | 2212 | #ifdef CONFIG_SYSCTL |
752d14dc PE |
2213 | tbl = kmemdup(tbl, sizeof(ctl_forward_entry), GFP_KERNEL); |
2214 | if (tbl == NULL) | |
2215 | goto err_alloc_ctl; | |
2216 | ||
02291680 | 2217 | tbl[0].data = &all->data[IPV4_DEVCONF_FORWARDING - 1]; |
752d14dc PE |
2218 | tbl[0].extra1 = all; |
2219 | tbl[0].extra2 = net; | |
2a75de0c | 2220 | #endif |
752d14dc PE |
2221 | } |
2222 | ||
2223 | #ifdef CONFIG_SYSCTL | |
f8572d8f | 2224 | err = __devinet_sysctl_register(net, "all", all); |
752d14dc PE |
2225 | if (err < 0) |
2226 | goto err_reg_all; | |
2227 | ||
f8572d8f | 2228 | err = __devinet_sysctl_register(net, "default", dflt); |
752d14dc PE |
2229 | if (err < 0) |
2230 | goto err_reg_dflt; | |
2231 | ||
2232 | err = -ENOMEM; | |
8607ddb8 | 2233 | forw_hdr = register_net_sysctl(net, "net/ipv4", tbl); |
752d14dc PE |
2234 | if (forw_hdr == NULL) |
2235 | goto err_reg_ctl; | |
2a75de0c | 2236 | net->ipv4.forw_hdr = forw_hdr; |
752d14dc PE |
2237 | #endif |
2238 | ||
752d14dc PE |
2239 | net->ipv4.devconf_all = all; |
2240 | net->ipv4.devconf_dflt = dflt; | |
2241 | return 0; | |
2242 | ||
2243 | #ifdef CONFIG_SYSCTL | |
2244 | err_reg_ctl: | |
2245 | __devinet_sysctl_unregister(dflt); | |
2246 | err_reg_dflt: | |
2247 | __devinet_sysctl_unregister(all); | |
2248 | err_reg_all: | |
2249 | if (tbl != ctl_forward_entry) | |
2250 | kfree(tbl); | |
752d14dc | 2251 | err_alloc_ctl: |
2a75de0c | 2252 | #endif |
752d14dc PE |
2253 | if (dflt != &ipv4_devconf_dflt) |
2254 | kfree(dflt); | |
2255 | err_alloc_dflt: | |
2256 | if (all != &ipv4_devconf) | |
2257 | kfree(all); | |
2258 | err_alloc_all: | |
2259 | return err; | |
2260 | } | |
2261 | ||
2262 | static __net_exit void devinet_exit_net(struct net *net) | |
2263 | { | |
2a75de0c | 2264 | #ifdef CONFIG_SYSCTL |
752d14dc PE |
2265 | struct ctl_table *tbl; |
2266 | ||
2267 | tbl = net->ipv4.forw_hdr->ctl_table_arg; | |
752d14dc PE |
2268 | unregister_net_sysctl_table(net->ipv4.forw_hdr); |
2269 | __devinet_sysctl_unregister(net->ipv4.devconf_dflt); | |
2270 | __devinet_sysctl_unregister(net->ipv4.devconf_all); | |
752d14dc | 2271 | kfree(tbl); |
2a75de0c | 2272 | #endif |
752d14dc PE |
2273 | kfree(net->ipv4.devconf_dflt); |
2274 | kfree(net->ipv4.devconf_all); | |
2275 | } | |
2276 | ||
2277 | static __net_initdata struct pernet_operations devinet_ops = { | |
2278 | .init = devinet_init_net, | |
2279 | .exit = devinet_exit_net, | |
2280 | }; | |
2281 | ||
9f0f7272 TG |
2282 | static struct rtnl_af_ops inet_af_ops = { |
2283 | .family = AF_INET, | |
2284 | .fill_link_af = inet_fill_link_af, | |
2285 | .get_link_af_size = inet_get_link_af_size, | |
cf7afbfe TG |
2286 | .validate_link_af = inet_validate_link_af, |
2287 | .set_link_af = inet_set_link_af, | |
9f0f7272 TG |
2288 | }; |
2289 | ||
1da177e4 LT |
2290 | void __init devinet_init(void) |
2291 | { | |
fd23c3b3 DM |
2292 | int i; |
2293 | ||
2294 | for (i = 0; i < IN4_ADDR_HSIZE; i++) | |
2295 | INIT_HLIST_HEAD(&inet_addr_lst[i]); | |
2296 | ||
752d14dc PE |
2297 | register_pernet_subsys(&devinet_ops); |
2298 | ||
1da177e4 LT |
2299 | register_gifconf(PF_INET, inet_gifconf); |
2300 | register_netdevice_notifier(&ip_netdev_notifier); | |
63f3444f | 2301 | |
5c766d64 JP |
2302 | schedule_delayed_work(&check_lifetime_work, 0); |
2303 | ||
9f0f7272 TG |
2304 | rtnl_af_register(&inet_af_ops); |
2305 | ||
c7ac8679 GR |
2306 | rtnl_register(PF_INET, RTM_NEWADDR, inet_rtm_newaddr, NULL, NULL); |
2307 | rtnl_register(PF_INET, RTM_DELADDR, inet_rtm_deladdr, NULL, NULL); | |
2308 | rtnl_register(PF_INET, RTM_GETADDR, NULL, inet_dump_ifaddr, NULL); | |
9e551110 | 2309 | rtnl_register(PF_INET, RTM_GETNETCONF, inet_netconf_get_devconf, |
7a674200 | 2310 | inet_netconf_dump_devconf, NULL); |
1da177e4 LT |
2311 | } |
2312 |