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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> | |
edc9e748 | 58 | #include <linux/netconf.h> |
1da177e4 | 59 | |
14c85021 | 60 | #include <net/arp.h> |
1da177e4 LT |
61 | #include <net/ip.h> |
62 | #include <net/route.h> | |
63 | #include <net/ip_fib.h> | |
63f3444f | 64 | #include <net/rtnetlink.h> |
752d14dc | 65 | #include <net/net_namespace.h> |
5c766d64 | 66 | #include <net/addrconf.h> |
1da177e4 | 67 | |
406b6f97 DM |
68 | #include "fib_lookup.h" |
69 | ||
0027ba84 | 70 | static struct ipv4_devconf ipv4_devconf = { |
42f811b8 | 71 | .data = { |
02291680 EB |
72 | [IPV4_DEVCONF_ACCEPT_REDIRECTS - 1] = 1, |
73 | [IPV4_DEVCONF_SEND_REDIRECTS - 1] = 1, | |
74 | [IPV4_DEVCONF_SECURE_REDIRECTS - 1] = 1, | |
75 | [IPV4_DEVCONF_SHARED_MEDIA - 1] = 1, | |
2690048c WM |
76 | [IPV4_DEVCONF_IGMPV2_UNSOLICITED_REPORT_INTERVAL - 1] = 10000 /*ms*/, |
77 | [IPV4_DEVCONF_IGMPV3_UNSOLICITED_REPORT_INTERVAL - 1] = 1000 /*ms*/, | |
42f811b8 | 78 | }, |
1da177e4 LT |
79 | }; |
80 | ||
81 | static struct ipv4_devconf ipv4_devconf_dflt = { | |
42f811b8 | 82 | .data = { |
02291680 EB |
83 | [IPV4_DEVCONF_ACCEPT_REDIRECTS - 1] = 1, |
84 | [IPV4_DEVCONF_SEND_REDIRECTS - 1] = 1, | |
85 | [IPV4_DEVCONF_SECURE_REDIRECTS - 1] = 1, | |
86 | [IPV4_DEVCONF_SHARED_MEDIA - 1] = 1, | |
87 | [IPV4_DEVCONF_ACCEPT_SOURCE_ROUTE - 1] = 1, | |
2690048c WM |
88 | [IPV4_DEVCONF_IGMPV2_UNSOLICITED_REPORT_INTERVAL - 1] = 10000 /*ms*/, |
89 | [IPV4_DEVCONF_IGMPV3_UNSOLICITED_REPORT_INTERVAL - 1] = 1000 /*ms*/, | |
42f811b8 | 90 | }, |
1da177e4 LT |
91 | }; |
92 | ||
9355bbd6 PE |
93 | #define IPV4_DEVCONF_DFLT(net, attr) \ |
94 | IPV4_DEVCONF((*net->ipv4.devconf_dflt), attr) | |
42f811b8 | 95 | |
ef7c79ed | 96 | static const struct nla_policy ifa_ipv4_policy[IFA_MAX+1] = { |
5c753978 TG |
97 | [IFA_LOCAL] = { .type = NLA_U32 }, |
98 | [IFA_ADDRESS] = { .type = NLA_U32 }, | |
99 | [IFA_BROADCAST] = { .type = NLA_U32 }, | |
5176f91e | 100 | [IFA_LABEL] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, |
5c766d64 | 101 | [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, |
ad6c8135 | 102 | [IFA_FLAGS] = { .type = NLA_U32 }, |
5c753978 TG |
103 | }; |
104 | ||
40384999 ED |
105 | #define IN4_ADDR_HSIZE_SHIFT 8 |
106 | #define IN4_ADDR_HSIZE (1U << IN4_ADDR_HSIZE_SHIFT) | |
107 | ||
fd23c3b3 | 108 | static struct hlist_head inet_addr_lst[IN4_ADDR_HSIZE]; |
fd23c3b3 | 109 | |
6eada011 | 110 | static u32 inet_addr_hash(const struct net *net, __be32 addr) |
fd23c3b3 | 111 | { |
40384999 | 112 | u32 val = (__force u32) addr ^ net_hash_mix(net); |
fd23c3b3 | 113 | |
40384999 | 114 | return hash_32(val, IN4_ADDR_HSIZE_SHIFT); |
fd23c3b3 DM |
115 | } |
116 | ||
117 | static void inet_hash_insert(struct net *net, struct in_ifaddr *ifa) | |
118 | { | |
40384999 | 119 | u32 hash = inet_addr_hash(net, ifa->ifa_local); |
fd23c3b3 | 120 | |
32a4be48 | 121 | ASSERT_RTNL(); |
fd23c3b3 | 122 | hlist_add_head_rcu(&ifa->hash, &inet_addr_lst[hash]); |
fd23c3b3 DM |
123 | } |
124 | ||
125 | static void inet_hash_remove(struct in_ifaddr *ifa) | |
126 | { | |
32a4be48 | 127 | ASSERT_RTNL(); |
fd23c3b3 | 128 | hlist_del_init_rcu(&ifa->hash); |
fd23c3b3 DM |
129 | } |
130 | ||
9435eb1c DM |
131 | /** |
132 | * __ip_dev_find - find the first device with a given source address. | |
133 | * @net: the net namespace | |
134 | * @addr: the source address | |
135 | * @devref: if true, take a reference on the found device | |
136 | * | |
137 | * If a caller uses devref=false, it should be protected by RCU, or RTNL | |
138 | */ | |
139 | struct net_device *__ip_dev_find(struct net *net, __be32 addr, bool devref) | |
140 | { | |
40384999 | 141 | u32 hash = inet_addr_hash(net, addr); |
9435eb1c DM |
142 | struct net_device *result = NULL; |
143 | struct in_ifaddr *ifa; | |
9435eb1c DM |
144 | |
145 | rcu_read_lock(); | |
b67bfe0d | 146 | hlist_for_each_entry_rcu(ifa, &inet_addr_lst[hash], hash) { |
e066008b | 147 | if (ifa->ifa_local == addr) { |
40384999 ED |
148 | struct net_device *dev = ifa->ifa_dev->dev; |
149 | ||
150 | if (!net_eq(dev_net(dev), net)) | |
151 | continue; | |
9435eb1c DM |
152 | result = dev; |
153 | break; | |
154 | } | |
155 | } | |
406b6f97 DM |
156 | if (!result) { |
157 | struct flowi4 fl4 = { .daddr = addr }; | |
158 | struct fib_result res = { 0 }; | |
159 | struct fib_table *local; | |
160 | ||
161 | /* Fallback to FIB local table so that communication | |
162 | * over loopback subnets work. | |
163 | */ | |
164 | local = fib_get_table(net, RT_TABLE_LOCAL); | |
165 | if (local && | |
166 | !fib_table_lookup(local, &fl4, &res, FIB_LOOKUP_NOREF) && | |
167 | res.type == RTN_LOCAL) | |
168 | result = FIB_RES_DEV(res); | |
169 | } | |
9435eb1c DM |
170 | if (result && devref) |
171 | dev_hold(result); | |
172 | rcu_read_unlock(); | |
173 | return result; | |
174 | } | |
175 | EXPORT_SYMBOL(__ip_dev_find); | |
176 | ||
d6062cbb | 177 | static void rtmsg_ifa(int event, struct in_ifaddr *, struct nlmsghdr *, u32); |
1da177e4 | 178 | |
e041c683 | 179 | static BLOCKING_NOTIFIER_HEAD(inetaddr_chain); |
1da177e4 LT |
180 | static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap, |
181 | int destroy); | |
182 | #ifdef CONFIG_SYSCTL | |
20e61da7 | 183 | static int devinet_sysctl_register(struct in_device *idev); |
51602b2a PE |
184 | static void devinet_sysctl_unregister(struct in_device *idev); |
185 | #else | |
20e61da7 | 186 | static int devinet_sysctl_register(struct in_device *idev) |
51602b2a | 187 | { |
20e61da7 | 188 | return 0; |
51602b2a | 189 | } |
40384999 | 190 | static void devinet_sysctl_unregister(struct in_device *idev) |
51602b2a PE |
191 | { |
192 | } | |
1da177e4 LT |
193 | #endif |
194 | ||
195 | /* Locks all the inet devices. */ | |
196 | ||
197 | static struct in_ifaddr *inet_alloc_ifa(void) | |
198 | { | |
93adcc80 | 199 | return kzalloc(sizeof(struct in_ifaddr), GFP_KERNEL); |
1da177e4 LT |
200 | } |
201 | ||
202 | static void inet_rcu_free_ifa(struct rcu_head *head) | |
203 | { | |
204 | struct in_ifaddr *ifa = container_of(head, struct in_ifaddr, rcu_head); | |
205 | if (ifa->ifa_dev) | |
206 | in_dev_put(ifa->ifa_dev); | |
207 | kfree(ifa); | |
208 | } | |
209 | ||
40384999 | 210 | static void inet_free_ifa(struct in_ifaddr *ifa) |
1da177e4 LT |
211 | { |
212 | call_rcu(&ifa->rcu_head, inet_rcu_free_ifa); | |
213 | } | |
214 | ||
215 | void in_dev_finish_destroy(struct in_device *idev) | |
216 | { | |
217 | struct net_device *dev = idev->dev; | |
218 | ||
547b792c IJ |
219 | WARN_ON(idev->ifa_list); |
220 | WARN_ON(idev->mc_list); | |
e9897071 | 221 | kfree(rcu_dereference_protected(idev->mc_hash, 1)); |
1da177e4 | 222 | #ifdef NET_REFCNT_DEBUG |
91df42be | 223 | pr_debug("%s: %p=%s\n", __func__, idev, dev ? dev->name : "NIL"); |
1da177e4 LT |
224 | #endif |
225 | dev_put(dev); | |
226 | if (!idev->dead) | |
9f9354b9 ED |
227 | pr_err("Freeing alive in_device %p\n", idev); |
228 | else | |
1da177e4 | 229 | kfree(idev); |
1da177e4 | 230 | } |
9f9354b9 | 231 | EXPORT_SYMBOL(in_dev_finish_destroy); |
1da177e4 | 232 | |
71e27da9 | 233 | static struct in_device *inetdev_init(struct net_device *dev) |
1da177e4 LT |
234 | { |
235 | struct in_device *in_dev; | |
20e61da7 | 236 | int err = -ENOMEM; |
1da177e4 LT |
237 | |
238 | ASSERT_RTNL(); | |
239 | ||
0da974f4 | 240 | in_dev = kzalloc(sizeof(*in_dev), GFP_KERNEL); |
1da177e4 LT |
241 | if (!in_dev) |
242 | goto out; | |
c346dca1 | 243 | memcpy(&in_dev->cnf, dev_net(dev)->ipv4.devconf_dflt, |
9355bbd6 | 244 | sizeof(in_dev->cnf)); |
1da177e4 LT |
245 | in_dev->cnf.sysctl = NULL; |
246 | in_dev->dev = dev; | |
9f9354b9 ED |
247 | in_dev->arp_parms = neigh_parms_alloc(dev, &arp_tbl); |
248 | if (!in_dev->arp_parms) | |
1da177e4 | 249 | goto out_kfree; |
0187bdfb BH |
250 | if (IPV4_DEVCONF(in_dev->cnf, FORWARDING)) |
251 | dev_disable_lro(dev); | |
1da177e4 LT |
252 | /* Reference in_dev->dev */ |
253 | dev_hold(dev); | |
30c4cf57 | 254 | /* Account for reference dev->ip_ptr (below) */ |
1da177e4 | 255 | in_dev_hold(in_dev); |
1da177e4 | 256 | |
20e61da7 WC |
257 | err = devinet_sysctl_register(in_dev); |
258 | if (err) { | |
259 | in_dev->dead = 1; | |
260 | in_dev_put(in_dev); | |
261 | in_dev = NULL; | |
262 | goto out; | |
263 | } | |
1da177e4 LT |
264 | ip_mc_init_dev(in_dev); |
265 | if (dev->flags & IFF_UP) | |
266 | ip_mc_up(in_dev); | |
483479ec | 267 | |
30c4cf57 | 268 | /* we can receive as soon as ip_ptr is set -- do this last */ |
cf778b00 | 269 | rcu_assign_pointer(dev->ip_ptr, in_dev); |
483479ec | 270 | out: |
20e61da7 | 271 | return in_dev ?: ERR_PTR(err); |
1da177e4 LT |
272 | out_kfree: |
273 | kfree(in_dev); | |
274 | in_dev = NULL; | |
275 | goto out; | |
276 | } | |
277 | ||
278 | static void in_dev_rcu_put(struct rcu_head *head) | |
279 | { | |
280 | struct in_device *idev = container_of(head, struct in_device, rcu_head); | |
281 | in_dev_put(idev); | |
282 | } | |
283 | ||
284 | static void inetdev_destroy(struct in_device *in_dev) | |
285 | { | |
286 | struct in_ifaddr *ifa; | |
287 | struct net_device *dev; | |
288 | ||
289 | ASSERT_RTNL(); | |
290 | ||
291 | dev = in_dev->dev; | |
1da177e4 LT |
292 | |
293 | in_dev->dead = 1; | |
294 | ||
295 | ip_mc_destroy_dev(in_dev); | |
296 | ||
297 | while ((ifa = in_dev->ifa_list) != NULL) { | |
298 | inet_del_ifa(in_dev, &in_dev->ifa_list, 0); | |
299 | inet_free_ifa(ifa); | |
300 | } | |
301 | ||
a9b3cd7f | 302 | RCU_INIT_POINTER(dev->ip_ptr, NULL); |
1da177e4 | 303 | |
51602b2a | 304 | devinet_sysctl_unregister(in_dev); |
1da177e4 LT |
305 | neigh_parms_release(&arp_tbl, in_dev->arp_parms); |
306 | arp_ifdown(dev); | |
307 | ||
308 | call_rcu(&in_dev->rcu_head, in_dev_rcu_put); | |
309 | } | |
310 | ||
ff428d72 | 311 | int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b) |
1da177e4 LT |
312 | { |
313 | rcu_read_lock(); | |
314 | for_primary_ifa(in_dev) { | |
315 | if (inet_ifa_match(a, ifa)) { | |
316 | if (!b || inet_ifa_match(b, ifa)) { | |
317 | rcu_read_unlock(); | |
318 | return 1; | |
319 | } | |
320 | } | |
321 | } endfor_ifa(in_dev); | |
322 | rcu_read_unlock(); | |
323 | return 0; | |
324 | } | |
325 | ||
d6062cbb | 326 | static void __inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap, |
15e47304 | 327 | int destroy, struct nlmsghdr *nlh, u32 portid) |
1da177e4 | 328 | { |
8f937c60 | 329 | struct in_ifaddr *promote = NULL; |
0ff60a45 JHS |
330 | struct in_ifaddr *ifa, *ifa1 = *ifap; |
331 | struct in_ifaddr *last_prim = in_dev->ifa_list; | |
332 | struct in_ifaddr *prev_prom = NULL; | |
333 | int do_promote = IN_DEV_PROMOTE_SECONDARIES(in_dev); | |
1da177e4 LT |
334 | |
335 | ASSERT_RTNL(); | |
336 | ||
fbd40ea0 DM |
337 | if (in_dev->dead) |
338 | goto no_promotions; | |
339 | ||
e905a9ed | 340 | /* 1. Deleting primary ifaddr forces deletion all secondaries |
8f937c60 HW |
341 | * unless alias promotion is set |
342 | **/ | |
1da177e4 LT |
343 | |
344 | if (!(ifa1->ifa_flags & IFA_F_SECONDARY)) { | |
1da177e4 LT |
345 | struct in_ifaddr **ifap1 = &ifa1->ifa_next; |
346 | ||
347 | while ((ifa = *ifap1) != NULL) { | |
e905a9ed | 348 | if (!(ifa->ifa_flags & IFA_F_SECONDARY) && |
0ff60a45 JHS |
349 | ifa1->ifa_scope <= ifa->ifa_scope) |
350 | last_prim = ifa; | |
351 | ||
1da177e4 LT |
352 | if (!(ifa->ifa_flags & IFA_F_SECONDARY) || |
353 | ifa1->ifa_mask != ifa->ifa_mask || | |
354 | !inet_ifa_match(ifa1->ifa_address, ifa)) { | |
355 | ifap1 = &ifa->ifa_next; | |
0ff60a45 | 356 | prev_prom = ifa; |
1da177e4 LT |
357 | continue; |
358 | } | |
359 | ||
0ff60a45 | 360 | if (!do_promote) { |
fd23c3b3 | 361 | inet_hash_remove(ifa); |
8f937c60 | 362 | *ifap1 = ifa->ifa_next; |
1da177e4 | 363 | |
15e47304 | 364 | rtmsg_ifa(RTM_DELADDR, ifa, nlh, portid); |
e041c683 AS |
365 | blocking_notifier_call_chain(&inetaddr_chain, |
366 | NETDEV_DOWN, ifa); | |
8f937c60 HW |
367 | inet_free_ifa(ifa); |
368 | } else { | |
369 | promote = ifa; | |
370 | break; | |
371 | } | |
1da177e4 LT |
372 | } |
373 | } | |
374 | ||
2d230e2b JA |
375 | /* On promotion all secondaries from subnet are changing |
376 | * the primary IP, we must remove all their routes silently | |
377 | * and later to add them back with new prefsrc. Do this | |
378 | * while all addresses are on the device list. | |
379 | */ | |
380 | for (ifa = promote; ifa; ifa = ifa->ifa_next) { | |
381 | if (ifa1->ifa_mask == ifa->ifa_mask && | |
382 | inet_ifa_match(ifa1->ifa_address, ifa)) | |
383 | fib_del_ifaddr(ifa, ifa1); | |
384 | } | |
385 | ||
fbd40ea0 | 386 | no_promotions: |
1da177e4 LT |
387 | /* 2. Unlink it */ |
388 | ||
389 | *ifap = ifa1->ifa_next; | |
fd23c3b3 | 390 | inet_hash_remove(ifa1); |
1da177e4 LT |
391 | |
392 | /* 3. Announce address deletion */ | |
393 | ||
394 | /* Send message first, then call notifier. | |
395 | At first sight, FIB update triggered by notifier | |
396 | will refer to already deleted ifaddr, that could confuse | |
397 | netlink listeners. It is not true: look, gated sees | |
398 | that route deleted and if it still thinks that ifaddr | |
399 | is valid, it will try to restore deleted routes... Grr. | |
400 | So that, this order is correct. | |
401 | */ | |
15e47304 | 402 | rtmsg_ifa(RTM_DELADDR, ifa1, nlh, portid); |
e041c683 | 403 | blocking_notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa1); |
1da177e4 | 404 | |
0ff60a45 | 405 | if (promote) { |
04024b93 | 406 | struct in_ifaddr *next_sec = promote->ifa_next; |
0ff60a45 JHS |
407 | |
408 | if (prev_prom) { | |
409 | prev_prom->ifa_next = promote->ifa_next; | |
410 | promote->ifa_next = last_prim->ifa_next; | |
411 | last_prim->ifa_next = promote; | |
412 | } | |
8f937c60 | 413 | |
8f937c60 | 414 | promote->ifa_flags &= ~IFA_F_SECONDARY; |
15e47304 | 415 | rtmsg_ifa(RTM_NEWADDR, promote, nlh, portid); |
e041c683 AS |
416 | blocking_notifier_call_chain(&inetaddr_chain, |
417 | NETDEV_UP, promote); | |
04024b93 | 418 | for (ifa = next_sec; ifa; ifa = ifa->ifa_next) { |
0ff60a45 JHS |
419 | if (ifa1->ifa_mask != ifa->ifa_mask || |
420 | !inet_ifa_match(ifa1->ifa_address, ifa)) | |
421 | continue; | |
422 | fib_add_ifaddr(ifa); | |
423 | } | |
424 | ||
425 | } | |
6363097c | 426 | if (destroy) |
0ff60a45 | 427 | inet_free_ifa(ifa1); |
1da177e4 LT |
428 | } |
429 | ||
d6062cbb TG |
430 | static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap, |
431 | int destroy) | |
432 | { | |
433 | __inet_del_ifa(in_dev, ifap, destroy, NULL, 0); | |
434 | } | |
435 | ||
5c766d64 JP |
436 | static void check_lifetime(struct work_struct *work); |
437 | ||
438 | static DECLARE_DELAYED_WORK(check_lifetime_work, check_lifetime); | |
439 | ||
d6062cbb | 440 | static int __inet_insert_ifa(struct in_ifaddr *ifa, struct nlmsghdr *nlh, |
15e47304 | 441 | u32 portid) |
1da177e4 LT |
442 | { |
443 | struct in_device *in_dev = ifa->ifa_dev; | |
444 | struct in_ifaddr *ifa1, **ifap, **last_primary; | |
445 | ||
446 | ASSERT_RTNL(); | |
447 | ||
448 | if (!ifa->ifa_local) { | |
449 | inet_free_ifa(ifa); | |
450 | return 0; | |
451 | } | |
452 | ||
453 | ifa->ifa_flags &= ~IFA_F_SECONDARY; | |
454 | last_primary = &in_dev->ifa_list; | |
455 | ||
456 | for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL; | |
457 | ifap = &ifa1->ifa_next) { | |
458 | if (!(ifa1->ifa_flags & IFA_F_SECONDARY) && | |
459 | ifa->ifa_scope <= ifa1->ifa_scope) | |
460 | last_primary = &ifa1->ifa_next; | |
461 | if (ifa1->ifa_mask == ifa->ifa_mask && | |
462 | inet_ifa_match(ifa1->ifa_address, ifa)) { | |
463 | if (ifa1->ifa_local == ifa->ifa_local) { | |
464 | inet_free_ifa(ifa); | |
465 | return -EEXIST; | |
466 | } | |
467 | if (ifa1->ifa_scope != ifa->ifa_scope) { | |
468 | inet_free_ifa(ifa); | |
469 | return -EINVAL; | |
470 | } | |
471 | ifa->ifa_flags |= IFA_F_SECONDARY; | |
472 | } | |
473 | } | |
474 | ||
475 | if (!(ifa->ifa_flags & IFA_F_SECONDARY)) { | |
63862b5b | 476 | prandom_seed((__force u32) ifa->ifa_local); |
1da177e4 LT |
477 | ifap = last_primary; |
478 | } | |
479 | ||
480 | ifa->ifa_next = *ifap; | |
481 | *ifap = ifa; | |
482 | ||
fd23c3b3 DM |
483 | inet_hash_insert(dev_net(in_dev->dev), ifa); |
484 | ||
5c766d64 | 485 | cancel_delayed_work(&check_lifetime_work); |
906e073f | 486 | queue_delayed_work(system_power_efficient_wq, &check_lifetime_work, 0); |
5c766d64 | 487 | |
1da177e4 LT |
488 | /* Send message first, then call notifier. |
489 | Notifier will trigger FIB update, so that | |
490 | listeners of netlink will know about new ifaddr */ | |
15e47304 | 491 | rtmsg_ifa(RTM_NEWADDR, ifa, nlh, portid); |
e041c683 | 492 | blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa); |
1da177e4 LT |
493 | |
494 | return 0; | |
495 | } | |
496 | ||
d6062cbb TG |
497 | static int inet_insert_ifa(struct in_ifaddr *ifa) |
498 | { | |
499 | return __inet_insert_ifa(ifa, NULL, 0); | |
500 | } | |
501 | ||
1da177e4 LT |
502 | static int inet_set_ifa(struct net_device *dev, struct in_ifaddr *ifa) |
503 | { | |
e5ed6399 | 504 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
1da177e4 LT |
505 | |
506 | ASSERT_RTNL(); | |
507 | ||
508 | if (!in_dev) { | |
71e27da9 HX |
509 | inet_free_ifa(ifa); |
510 | return -ENOBUFS; | |
1da177e4 | 511 | } |
71e27da9 | 512 | ipv4_devconf_setall(in_dev); |
1d4c8c29 | 513 | neigh_parms_data_state_setall(in_dev->arp_parms); |
1da177e4 | 514 | if (ifa->ifa_dev != in_dev) { |
547b792c | 515 | WARN_ON(ifa->ifa_dev); |
1da177e4 LT |
516 | in_dev_hold(in_dev); |
517 | ifa->ifa_dev = in_dev; | |
518 | } | |
f97c1e0c | 519 | if (ipv4_is_loopback(ifa->ifa_local)) |
1da177e4 LT |
520 | ifa->ifa_scope = RT_SCOPE_HOST; |
521 | return inet_insert_ifa(ifa); | |
522 | } | |
523 | ||
8723e1b4 ED |
524 | /* Caller must hold RCU or RTNL : |
525 | * We dont take a reference on found in_device | |
526 | */ | |
7fee0ca2 | 527 | struct in_device *inetdev_by_index(struct net *net, int ifindex) |
1da177e4 LT |
528 | { |
529 | struct net_device *dev; | |
530 | struct in_device *in_dev = NULL; | |
c148fc2e ED |
531 | |
532 | rcu_read_lock(); | |
533 | dev = dev_get_by_index_rcu(net, ifindex); | |
1da177e4 | 534 | if (dev) |
8723e1b4 | 535 | in_dev = rcu_dereference_rtnl(dev->ip_ptr); |
c148fc2e | 536 | rcu_read_unlock(); |
1da177e4 LT |
537 | return in_dev; |
538 | } | |
9f9354b9 | 539 | EXPORT_SYMBOL(inetdev_by_index); |
1da177e4 LT |
540 | |
541 | /* Called only from RTNL semaphored context. No locks. */ | |
542 | ||
60cad5da AV |
543 | struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix, |
544 | __be32 mask) | |
1da177e4 LT |
545 | { |
546 | ASSERT_RTNL(); | |
547 | ||
548 | for_primary_ifa(in_dev) { | |
549 | if (ifa->ifa_mask == mask && inet_ifa_match(prefix, ifa)) | |
550 | return ifa; | |
551 | } endfor_ifa(in_dev); | |
552 | return NULL; | |
553 | } | |
554 | ||
93a714d6 MC |
555 | static int ip_mc_config(struct sock *sk, bool join, const struct in_ifaddr *ifa) |
556 | { | |
557 | struct ip_mreqn mreq = { | |
558 | .imr_multiaddr.s_addr = ifa->ifa_address, | |
559 | .imr_ifindex = ifa->ifa_dev->dev->ifindex, | |
560 | }; | |
561 | int ret; | |
562 | ||
563 | ASSERT_RTNL(); | |
564 | ||
565 | lock_sock(sk); | |
566 | if (join) | |
54ff9ef3 | 567 | ret = ip_mc_join_group(sk, &mreq); |
93a714d6 | 568 | else |
54ff9ef3 | 569 | ret = ip_mc_leave_group(sk, &mreq); |
93a714d6 MC |
570 | release_sock(sk); |
571 | ||
572 | return ret; | |
573 | } | |
574 | ||
661d2967 | 575 | static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh) |
1da177e4 | 576 | { |
3b1e0a65 | 577 | struct net *net = sock_net(skb->sk); |
dfdd5fd4 | 578 | struct nlattr *tb[IFA_MAX+1]; |
1da177e4 | 579 | struct in_device *in_dev; |
dfdd5fd4 | 580 | struct ifaddrmsg *ifm; |
1da177e4 | 581 | struct in_ifaddr *ifa, **ifap; |
dfdd5fd4 | 582 | int err = -EINVAL; |
1da177e4 LT |
583 | |
584 | ASSERT_RTNL(); | |
585 | ||
dfdd5fd4 TG |
586 | err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy); |
587 | if (err < 0) | |
588 | goto errout; | |
589 | ||
590 | ifm = nlmsg_data(nlh); | |
7fee0ca2 | 591 | in_dev = inetdev_by_index(net, ifm->ifa_index); |
51456b29 | 592 | if (!in_dev) { |
dfdd5fd4 TG |
593 | err = -ENODEV; |
594 | goto errout; | |
595 | } | |
596 | ||
1da177e4 LT |
597 | for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; |
598 | ifap = &ifa->ifa_next) { | |
dfdd5fd4 | 599 | if (tb[IFA_LOCAL] && |
67b61f6c | 600 | ifa->ifa_local != nla_get_in_addr(tb[IFA_LOCAL])) |
dfdd5fd4 TG |
601 | continue; |
602 | ||
603 | if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label)) | |
1da177e4 | 604 | continue; |
dfdd5fd4 TG |
605 | |
606 | if (tb[IFA_ADDRESS] && | |
607 | (ifm->ifa_prefixlen != ifa->ifa_prefixlen || | |
67b61f6c | 608 | !inet_ifa_match(nla_get_in_addr(tb[IFA_ADDRESS]), ifa))) |
dfdd5fd4 TG |
609 | continue; |
610 | ||
93a714d6 MC |
611 | if (ipv4_is_multicast(ifa->ifa_address)) |
612 | ip_mc_config(net->ipv4.mc_autojoin_sk, false, ifa); | |
15e47304 | 613 | __inet_del_ifa(in_dev, ifap, 1, nlh, NETLINK_CB(skb).portid); |
1da177e4 LT |
614 | return 0; |
615 | } | |
dfdd5fd4 TG |
616 | |
617 | err = -EADDRNOTAVAIL; | |
618 | errout: | |
619 | return err; | |
1da177e4 LT |
620 | } |
621 | ||
5c766d64 JP |
622 | #define INFINITY_LIFE_TIME 0xFFFFFFFF |
623 | ||
624 | static void check_lifetime(struct work_struct *work) | |
625 | { | |
626 | unsigned long now, next, next_sec, next_sched; | |
627 | struct in_ifaddr *ifa; | |
c988d1e8 | 628 | struct hlist_node *n; |
5c766d64 JP |
629 | int i; |
630 | ||
631 | now = jiffies; | |
632 | next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); | |
633 | ||
5c766d64 | 634 | for (i = 0; i < IN4_ADDR_HSIZE; i++) { |
c988d1e8 JP |
635 | bool change_needed = false; |
636 | ||
637 | rcu_read_lock(); | |
b67bfe0d | 638 | hlist_for_each_entry_rcu(ifa, &inet_addr_lst[i], hash) { |
5c766d64 JP |
639 | unsigned long age; |
640 | ||
641 | if (ifa->ifa_flags & IFA_F_PERMANENT) | |
642 | continue; | |
643 | ||
644 | /* We try to batch several events at once. */ | |
645 | age = (now - ifa->ifa_tstamp + | |
646 | ADDRCONF_TIMER_FUZZ_MINUS) / HZ; | |
647 | ||
648 | if (ifa->ifa_valid_lft != INFINITY_LIFE_TIME && | |
649 | age >= ifa->ifa_valid_lft) { | |
c988d1e8 | 650 | change_needed = true; |
5c766d64 JP |
651 | } else if (ifa->ifa_preferred_lft == |
652 | INFINITY_LIFE_TIME) { | |
653 | continue; | |
654 | } else if (age >= ifa->ifa_preferred_lft) { | |
655 | if (time_before(ifa->ifa_tstamp + | |
656 | ifa->ifa_valid_lft * HZ, next)) | |
657 | next = ifa->ifa_tstamp + | |
658 | ifa->ifa_valid_lft * HZ; | |
659 | ||
c988d1e8 JP |
660 | if (!(ifa->ifa_flags & IFA_F_DEPRECATED)) |
661 | change_needed = true; | |
5c766d64 JP |
662 | } else if (time_before(ifa->ifa_tstamp + |
663 | ifa->ifa_preferred_lft * HZ, | |
664 | next)) { | |
665 | next = ifa->ifa_tstamp + | |
666 | ifa->ifa_preferred_lft * HZ; | |
667 | } | |
668 | } | |
c988d1e8 JP |
669 | rcu_read_unlock(); |
670 | if (!change_needed) | |
671 | continue; | |
672 | rtnl_lock(); | |
673 | hlist_for_each_entry_safe(ifa, n, &inet_addr_lst[i], hash) { | |
674 | unsigned long age; | |
675 | ||
676 | if (ifa->ifa_flags & IFA_F_PERMANENT) | |
677 | continue; | |
678 | ||
679 | /* We try to batch several events at once. */ | |
680 | age = (now - ifa->ifa_tstamp + | |
681 | ADDRCONF_TIMER_FUZZ_MINUS) / HZ; | |
682 | ||
683 | if (ifa->ifa_valid_lft != INFINITY_LIFE_TIME && | |
684 | age >= ifa->ifa_valid_lft) { | |
685 | struct in_ifaddr **ifap; | |
686 | ||
687 | for (ifap = &ifa->ifa_dev->ifa_list; | |
688 | *ifap != NULL; ifap = &(*ifap)->ifa_next) { | |
689 | if (*ifap == ifa) { | |
690 | inet_del_ifa(ifa->ifa_dev, | |
691 | ifap, 1); | |
692 | break; | |
693 | } | |
694 | } | |
695 | } else if (ifa->ifa_preferred_lft != | |
696 | INFINITY_LIFE_TIME && | |
697 | age >= ifa->ifa_preferred_lft && | |
698 | !(ifa->ifa_flags & IFA_F_DEPRECATED)) { | |
699 | ifa->ifa_flags |= IFA_F_DEPRECATED; | |
700 | rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0); | |
701 | } | |
702 | } | |
703 | rtnl_unlock(); | |
5c766d64 | 704 | } |
5c766d64 JP |
705 | |
706 | next_sec = round_jiffies_up(next); | |
707 | next_sched = next; | |
708 | ||
709 | /* If rounded timeout is accurate enough, accept it. */ | |
710 | if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) | |
711 | next_sched = next_sec; | |
712 | ||
713 | now = jiffies; | |
714 | /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ | |
715 | if (time_before(next_sched, now + ADDRCONF_TIMER_FUZZ_MAX)) | |
716 | next_sched = now + ADDRCONF_TIMER_FUZZ_MAX; | |
717 | ||
906e073f VK |
718 | queue_delayed_work(system_power_efficient_wq, &check_lifetime_work, |
719 | next_sched - now); | |
5c766d64 JP |
720 | } |
721 | ||
722 | static void set_ifa_lifetime(struct in_ifaddr *ifa, __u32 valid_lft, | |
723 | __u32 prefered_lft) | |
724 | { | |
725 | unsigned long timeout; | |
726 | ||
727 | ifa->ifa_flags &= ~(IFA_F_PERMANENT | IFA_F_DEPRECATED); | |
728 | ||
729 | timeout = addrconf_timeout_fixup(valid_lft, HZ); | |
730 | if (addrconf_finite_timeout(timeout)) | |
731 | ifa->ifa_valid_lft = timeout; | |
732 | else | |
733 | ifa->ifa_flags |= IFA_F_PERMANENT; | |
734 | ||
735 | timeout = addrconf_timeout_fixup(prefered_lft, HZ); | |
736 | if (addrconf_finite_timeout(timeout)) { | |
737 | if (timeout == 0) | |
738 | ifa->ifa_flags |= IFA_F_DEPRECATED; | |
739 | ifa->ifa_preferred_lft = timeout; | |
740 | } | |
741 | ifa->ifa_tstamp = jiffies; | |
742 | if (!ifa->ifa_cstamp) | |
743 | ifa->ifa_cstamp = ifa->ifa_tstamp; | |
744 | } | |
745 | ||
746 | static struct in_ifaddr *rtm_to_ifaddr(struct net *net, struct nlmsghdr *nlh, | |
747 | __u32 *pvalid_lft, __u32 *pprefered_lft) | |
1da177e4 | 748 | { |
5c753978 TG |
749 | struct nlattr *tb[IFA_MAX+1]; |
750 | struct in_ifaddr *ifa; | |
751 | struct ifaddrmsg *ifm; | |
1da177e4 LT |
752 | struct net_device *dev; |
753 | struct in_device *in_dev; | |
7b218574 | 754 | int err; |
1da177e4 | 755 | |
5c753978 TG |
756 | err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy); |
757 | if (err < 0) | |
758 | goto errout; | |
1da177e4 | 759 | |
5c753978 | 760 | ifm = nlmsg_data(nlh); |
7b218574 | 761 | err = -EINVAL; |
51456b29 | 762 | if (ifm->ifa_prefixlen > 32 || !tb[IFA_LOCAL]) |
5c753978 | 763 | goto errout; |
1da177e4 | 764 | |
4b8aa9ab | 765 | dev = __dev_get_by_index(net, ifm->ifa_index); |
7b218574 | 766 | err = -ENODEV; |
51456b29 | 767 | if (!dev) |
5c753978 | 768 | goto errout; |
1da177e4 | 769 | |
5c753978 | 770 | in_dev = __in_dev_get_rtnl(dev); |
7b218574 | 771 | err = -ENOBUFS; |
51456b29 | 772 | if (!in_dev) |
71e27da9 | 773 | goto errout; |
1da177e4 | 774 | |
5c753978 | 775 | ifa = inet_alloc_ifa(); |
51456b29 | 776 | if (!ifa) |
5c753978 TG |
777 | /* |
778 | * A potential indev allocation can be left alive, it stays | |
779 | * assigned to its device and is destroy with it. | |
780 | */ | |
5c753978 | 781 | goto errout; |
5c753978 | 782 | |
a4e65d36 | 783 | ipv4_devconf_setall(in_dev); |
1d4c8c29 | 784 | neigh_parms_data_state_setall(in_dev->arp_parms); |
5c753978 TG |
785 | in_dev_hold(in_dev); |
786 | ||
51456b29 | 787 | if (!tb[IFA_ADDRESS]) |
5c753978 | 788 | tb[IFA_ADDRESS] = tb[IFA_LOCAL]; |
1da177e4 | 789 | |
fd23c3b3 | 790 | INIT_HLIST_NODE(&ifa->hash); |
1da177e4 LT |
791 | ifa->ifa_prefixlen = ifm->ifa_prefixlen; |
792 | ifa->ifa_mask = inet_make_mask(ifm->ifa_prefixlen); | |
ad6c8135 JP |
793 | ifa->ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : |
794 | ifm->ifa_flags; | |
1da177e4 | 795 | ifa->ifa_scope = ifm->ifa_scope; |
5c753978 TG |
796 | ifa->ifa_dev = in_dev; |
797 | ||
67b61f6c JB |
798 | ifa->ifa_local = nla_get_in_addr(tb[IFA_LOCAL]); |
799 | ifa->ifa_address = nla_get_in_addr(tb[IFA_ADDRESS]); | |
5c753978 TG |
800 | |
801 | if (tb[IFA_BROADCAST]) | |
67b61f6c | 802 | ifa->ifa_broadcast = nla_get_in_addr(tb[IFA_BROADCAST]); |
5c753978 | 803 | |
5c753978 TG |
804 | if (tb[IFA_LABEL]) |
805 | nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ); | |
1da177e4 LT |
806 | else |
807 | memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); | |
808 | ||
5c766d64 JP |
809 | if (tb[IFA_CACHEINFO]) { |
810 | struct ifa_cacheinfo *ci; | |
811 | ||
812 | ci = nla_data(tb[IFA_CACHEINFO]); | |
813 | if (!ci->ifa_valid || ci->ifa_prefered > ci->ifa_valid) { | |
814 | err = -EINVAL; | |
446266b0 | 815 | goto errout_free; |
5c766d64 JP |
816 | } |
817 | *pvalid_lft = ci->ifa_valid; | |
818 | *pprefered_lft = ci->ifa_prefered; | |
819 | } | |
820 | ||
5c753978 TG |
821 | return ifa; |
822 | ||
446266b0 DB |
823 | errout_free: |
824 | inet_free_ifa(ifa); | |
5c753978 TG |
825 | errout: |
826 | return ERR_PTR(err); | |
827 | } | |
828 | ||
5c766d64 JP |
829 | static struct in_ifaddr *find_matching_ifa(struct in_ifaddr *ifa) |
830 | { | |
831 | struct in_device *in_dev = ifa->ifa_dev; | |
832 | struct in_ifaddr *ifa1, **ifap; | |
833 | ||
834 | if (!ifa->ifa_local) | |
835 | return NULL; | |
836 | ||
837 | for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL; | |
838 | ifap = &ifa1->ifa_next) { | |
839 | if (ifa1->ifa_mask == ifa->ifa_mask && | |
840 | inet_ifa_match(ifa1->ifa_address, ifa) && | |
841 | ifa1->ifa_local == ifa->ifa_local) | |
842 | return ifa1; | |
843 | } | |
844 | return NULL; | |
845 | } | |
846 | ||
661d2967 | 847 | static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh) |
5c753978 | 848 | { |
3b1e0a65 | 849 | struct net *net = sock_net(skb->sk); |
5c753978 | 850 | struct in_ifaddr *ifa; |
5c766d64 JP |
851 | struct in_ifaddr *ifa_existing; |
852 | __u32 valid_lft = INFINITY_LIFE_TIME; | |
853 | __u32 prefered_lft = INFINITY_LIFE_TIME; | |
5c753978 TG |
854 | |
855 | ASSERT_RTNL(); | |
856 | ||
5c766d64 | 857 | ifa = rtm_to_ifaddr(net, nlh, &valid_lft, &prefered_lft); |
5c753978 TG |
858 | if (IS_ERR(ifa)) |
859 | return PTR_ERR(ifa); | |
860 | ||
5c766d64 JP |
861 | ifa_existing = find_matching_ifa(ifa); |
862 | if (!ifa_existing) { | |
863 | /* It would be best to check for !NLM_F_CREATE here but | |
614d056c | 864 | * userspace already relies on not having to provide this. |
5c766d64 JP |
865 | */ |
866 | set_ifa_lifetime(ifa, valid_lft, prefered_lft); | |
93a714d6 MC |
867 | if (ifa->ifa_flags & IFA_F_MCAUTOJOIN) { |
868 | int ret = ip_mc_config(net->ipv4.mc_autojoin_sk, | |
869 | true, ifa); | |
870 | ||
871 | if (ret < 0) { | |
872 | inet_free_ifa(ifa); | |
873 | return ret; | |
874 | } | |
875 | } | |
5c766d64 JP |
876 | return __inet_insert_ifa(ifa, nlh, NETLINK_CB(skb).portid); |
877 | } else { | |
878 | inet_free_ifa(ifa); | |
879 | ||
880 | if (nlh->nlmsg_flags & NLM_F_EXCL || | |
881 | !(nlh->nlmsg_flags & NLM_F_REPLACE)) | |
882 | return -EEXIST; | |
34e2ed34 JP |
883 | ifa = ifa_existing; |
884 | set_ifa_lifetime(ifa, valid_lft, prefered_lft); | |
05a324b9 | 885 | cancel_delayed_work(&check_lifetime_work); |
906e073f VK |
886 | queue_delayed_work(system_power_efficient_wq, |
887 | &check_lifetime_work, 0); | |
34e2ed34 | 888 | rtmsg_ifa(RTM_NEWADDR, ifa, nlh, NETLINK_CB(skb).portid); |
5c766d64 JP |
889 | } |
890 | return 0; | |
1da177e4 LT |
891 | } |
892 | ||
893 | /* | |
894 | * Determine a default network mask, based on the IP address. | |
895 | */ | |
896 | ||
40384999 | 897 | static int inet_abc_len(__be32 addr) |
1da177e4 LT |
898 | { |
899 | int rc = -1; /* Something else, probably a multicast. */ | |
900 | ||
f97c1e0c | 901 | if (ipv4_is_zeronet(addr)) |
e905a9ed | 902 | rc = 0; |
1da177e4 | 903 | else { |
714e85be | 904 | __u32 haddr = ntohl(addr); |
1da177e4 | 905 | |
714e85be | 906 | if (IN_CLASSA(haddr)) |
1da177e4 | 907 | rc = 8; |
714e85be | 908 | else if (IN_CLASSB(haddr)) |
1da177e4 | 909 | rc = 16; |
714e85be | 910 | else if (IN_CLASSC(haddr)) |
1da177e4 LT |
911 | rc = 24; |
912 | } | |
913 | ||
e905a9ed | 914 | return rc; |
1da177e4 LT |
915 | } |
916 | ||
917 | ||
e5b13cb1 | 918 | int devinet_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
1da177e4 LT |
919 | { |
920 | struct ifreq ifr; | |
921 | struct sockaddr_in sin_orig; | |
922 | struct sockaddr_in *sin = (struct sockaddr_in *)&ifr.ifr_addr; | |
923 | struct in_device *in_dev; | |
924 | struct in_ifaddr **ifap = NULL; | |
925 | struct in_ifaddr *ifa = NULL; | |
926 | struct net_device *dev; | |
927 | char *colon; | |
928 | int ret = -EFAULT; | |
929 | int tryaddrmatch = 0; | |
930 | ||
931 | /* | |
932 | * Fetch the caller's info block into kernel space | |
933 | */ | |
934 | ||
935 | if (copy_from_user(&ifr, arg, sizeof(struct ifreq))) | |
936 | goto out; | |
937 | ifr.ifr_name[IFNAMSIZ - 1] = 0; | |
938 | ||
939 | /* save original address for comparison */ | |
940 | memcpy(&sin_orig, sin, sizeof(*sin)); | |
941 | ||
942 | colon = strchr(ifr.ifr_name, ':'); | |
943 | if (colon) | |
944 | *colon = 0; | |
945 | ||
e5b13cb1 | 946 | dev_load(net, ifr.ifr_name); |
1da177e4 | 947 | |
132adf54 | 948 | switch (cmd) { |
1da177e4 LT |
949 | case SIOCGIFADDR: /* Get interface address */ |
950 | case SIOCGIFBRDADDR: /* Get the broadcast address */ | |
951 | case SIOCGIFDSTADDR: /* Get the destination address */ | |
952 | case SIOCGIFNETMASK: /* Get the netmask for the interface */ | |
953 | /* Note that these ioctls will not sleep, | |
954 | so that we do not impose a lock. | |
955 | One day we will be forced to put shlock here (I mean SMP) | |
956 | */ | |
957 | tryaddrmatch = (sin_orig.sin_family == AF_INET); | |
958 | memset(sin, 0, sizeof(*sin)); | |
959 | sin->sin_family = AF_INET; | |
960 | break; | |
961 | ||
962 | case SIOCSIFFLAGS: | |
bf5b30b8 | 963 | ret = -EPERM; |
52e804c6 | 964 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
965 | goto out; |
966 | break; | |
967 | case SIOCSIFADDR: /* Set interface address (and family) */ | |
968 | case SIOCSIFBRDADDR: /* Set the broadcast address */ | |
969 | case SIOCSIFDSTADDR: /* Set the destination address */ | |
970 | case SIOCSIFNETMASK: /* Set the netmask for the interface */ | |
bf5b30b8 | 971 | ret = -EPERM; |
52e804c6 | 972 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
973 | goto out; |
974 | ret = -EINVAL; | |
975 | if (sin->sin_family != AF_INET) | |
976 | goto out; | |
977 | break; | |
978 | default: | |
979 | ret = -EINVAL; | |
980 | goto out; | |
981 | } | |
982 | ||
983 | rtnl_lock(); | |
984 | ||
985 | ret = -ENODEV; | |
9f9354b9 ED |
986 | dev = __dev_get_by_name(net, ifr.ifr_name); |
987 | if (!dev) | |
1da177e4 LT |
988 | goto done; |
989 | ||
990 | if (colon) | |
991 | *colon = ':'; | |
992 | ||
9f9354b9 ED |
993 | in_dev = __in_dev_get_rtnl(dev); |
994 | if (in_dev) { | |
1da177e4 LT |
995 | if (tryaddrmatch) { |
996 | /* Matthias Andree */ | |
997 | /* compare label and address (4.4BSD style) */ | |
998 | /* note: we only do this for a limited set of ioctls | |
999 | and only if the original address family was AF_INET. | |
1000 | This is checked above. */ | |
1001 | for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; | |
1002 | ifap = &ifa->ifa_next) { | |
1003 | if (!strcmp(ifr.ifr_name, ifa->ifa_label) && | |
1004 | sin_orig.sin_addr.s_addr == | |
6c91afe1 | 1005 | ifa->ifa_local) { |
1da177e4 LT |
1006 | break; /* found */ |
1007 | } | |
1008 | } | |
1009 | } | |
1010 | /* we didn't get a match, maybe the application is | |
1011 | 4.3BSD-style and passed in junk so we fall back to | |
1012 | comparing just the label */ | |
1013 | if (!ifa) { | |
1014 | for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; | |
1015 | ifap = &ifa->ifa_next) | |
1016 | if (!strcmp(ifr.ifr_name, ifa->ifa_label)) | |
1017 | break; | |
1018 | } | |
1019 | } | |
1020 | ||
1021 | ret = -EADDRNOTAVAIL; | |
1022 | if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS) | |
1023 | goto done; | |
1024 | ||
132adf54 | 1025 | switch (cmd) { |
1da177e4 LT |
1026 | case SIOCGIFADDR: /* Get interface address */ |
1027 | sin->sin_addr.s_addr = ifa->ifa_local; | |
1028 | goto rarok; | |
1029 | ||
1030 | case SIOCGIFBRDADDR: /* Get the broadcast address */ | |
1031 | sin->sin_addr.s_addr = ifa->ifa_broadcast; | |
1032 | goto rarok; | |
1033 | ||
1034 | case SIOCGIFDSTADDR: /* Get the destination address */ | |
1035 | sin->sin_addr.s_addr = ifa->ifa_address; | |
1036 | goto rarok; | |
1037 | ||
1038 | case SIOCGIFNETMASK: /* Get the netmask for the interface */ | |
1039 | sin->sin_addr.s_addr = ifa->ifa_mask; | |
1040 | goto rarok; | |
1041 | ||
1042 | case SIOCSIFFLAGS: | |
1043 | if (colon) { | |
1044 | ret = -EADDRNOTAVAIL; | |
1045 | if (!ifa) | |
1046 | break; | |
1047 | ret = 0; | |
1048 | if (!(ifr.ifr_flags & IFF_UP)) | |
1049 | inet_del_ifa(in_dev, ifap, 1); | |
1050 | break; | |
1051 | } | |
1052 | ret = dev_change_flags(dev, ifr.ifr_flags); | |
1053 | break; | |
1054 | ||
1055 | case SIOCSIFADDR: /* Set interface address (and family) */ | |
1056 | ret = -EINVAL; | |
1057 | if (inet_abc_len(sin->sin_addr.s_addr) < 0) | |
1058 | break; | |
1059 | ||
1060 | if (!ifa) { | |
1061 | ret = -ENOBUFS; | |
9f9354b9 ED |
1062 | ifa = inet_alloc_ifa(); |
1063 | if (!ifa) | |
1da177e4 | 1064 | break; |
c7e2e1d7 | 1065 | INIT_HLIST_NODE(&ifa->hash); |
1da177e4 LT |
1066 | if (colon) |
1067 | memcpy(ifa->ifa_label, ifr.ifr_name, IFNAMSIZ); | |
1068 | else | |
1069 | memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); | |
1070 | } else { | |
1071 | ret = 0; | |
1072 | if (ifa->ifa_local == sin->sin_addr.s_addr) | |
1073 | break; | |
1074 | inet_del_ifa(in_dev, ifap, 0); | |
1075 | ifa->ifa_broadcast = 0; | |
148f9729 | 1076 | ifa->ifa_scope = 0; |
1da177e4 LT |
1077 | } |
1078 | ||
1079 | ifa->ifa_address = ifa->ifa_local = sin->sin_addr.s_addr; | |
1080 | ||
1081 | if (!(dev->flags & IFF_POINTOPOINT)) { | |
1082 | ifa->ifa_prefixlen = inet_abc_len(ifa->ifa_address); | |
1083 | ifa->ifa_mask = inet_make_mask(ifa->ifa_prefixlen); | |
1084 | if ((dev->flags & IFF_BROADCAST) && | |
1085 | ifa->ifa_prefixlen < 31) | |
1086 | ifa->ifa_broadcast = ifa->ifa_address | | |
1087 | ~ifa->ifa_mask; | |
1088 | } else { | |
1089 | ifa->ifa_prefixlen = 32; | |
1090 | ifa->ifa_mask = inet_make_mask(32); | |
1091 | } | |
5c766d64 | 1092 | set_ifa_lifetime(ifa, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); |
1da177e4 LT |
1093 | ret = inet_set_ifa(dev, ifa); |
1094 | break; | |
1095 | ||
1096 | case SIOCSIFBRDADDR: /* Set the broadcast address */ | |
1097 | ret = 0; | |
1098 | if (ifa->ifa_broadcast != sin->sin_addr.s_addr) { | |
1099 | inet_del_ifa(in_dev, ifap, 0); | |
1100 | ifa->ifa_broadcast = sin->sin_addr.s_addr; | |
1101 | inet_insert_ifa(ifa); | |
1102 | } | |
1103 | break; | |
1104 | ||
1105 | case SIOCSIFDSTADDR: /* Set the destination address */ | |
1106 | ret = 0; | |
1107 | if (ifa->ifa_address == sin->sin_addr.s_addr) | |
1108 | break; | |
1109 | ret = -EINVAL; | |
1110 | if (inet_abc_len(sin->sin_addr.s_addr) < 0) | |
1111 | break; | |
1112 | ret = 0; | |
1113 | inet_del_ifa(in_dev, ifap, 0); | |
1114 | ifa->ifa_address = sin->sin_addr.s_addr; | |
1115 | inet_insert_ifa(ifa); | |
1116 | break; | |
1117 | ||
1118 | case SIOCSIFNETMASK: /* Set the netmask for the interface */ | |
1119 | ||
1120 | /* | |
1121 | * The mask we set must be legal. | |
1122 | */ | |
1123 | ret = -EINVAL; | |
1124 | if (bad_mask(sin->sin_addr.s_addr, 0)) | |
1125 | break; | |
1126 | ret = 0; | |
1127 | if (ifa->ifa_mask != sin->sin_addr.s_addr) { | |
a144ea4b | 1128 | __be32 old_mask = ifa->ifa_mask; |
1da177e4 LT |
1129 | inet_del_ifa(in_dev, ifap, 0); |
1130 | ifa->ifa_mask = sin->sin_addr.s_addr; | |
1131 | ifa->ifa_prefixlen = inet_mask_len(ifa->ifa_mask); | |
1132 | ||
1133 | /* See if current broadcast address matches | |
1134 | * with current netmask, then recalculate | |
1135 | * the broadcast address. Otherwise it's a | |
1136 | * funny address, so don't touch it since | |
1137 | * the user seems to know what (s)he's doing... | |
1138 | */ | |
1139 | if ((dev->flags & IFF_BROADCAST) && | |
1140 | (ifa->ifa_prefixlen < 31) && | |
1141 | (ifa->ifa_broadcast == | |
dcab5e1e | 1142 | (ifa->ifa_local|~old_mask))) { |
1da177e4 LT |
1143 | ifa->ifa_broadcast = (ifa->ifa_local | |
1144 | ~sin->sin_addr.s_addr); | |
1145 | } | |
1146 | inet_insert_ifa(ifa); | |
1147 | } | |
1148 | break; | |
1149 | } | |
1150 | done: | |
1151 | rtnl_unlock(); | |
1152 | out: | |
1153 | return ret; | |
1154 | rarok: | |
1155 | rtnl_unlock(); | |
1156 | ret = copy_to_user(arg, &ifr, sizeof(struct ifreq)) ? -EFAULT : 0; | |
1157 | goto out; | |
1158 | } | |
1159 | ||
1160 | static int inet_gifconf(struct net_device *dev, char __user *buf, int len) | |
1161 | { | |
e5ed6399 | 1162 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
1da177e4 LT |
1163 | struct in_ifaddr *ifa; |
1164 | struct ifreq ifr; | |
1165 | int done = 0; | |
1166 | ||
9f9354b9 | 1167 | if (!in_dev) |
1da177e4 LT |
1168 | goto out; |
1169 | ||
9f9354b9 | 1170 | for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { |
1da177e4 LT |
1171 | if (!buf) { |
1172 | done += sizeof(ifr); | |
1173 | continue; | |
1174 | } | |
1175 | if (len < (int) sizeof(ifr)) | |
1176 | break; | |
1177 | memset(&ifr, 0, sizeof(struct ifreq)); | |
4299c8a9 | 1178 | strcpy(ifr.ifr_name, ifa->ifa_label); |
1da177e4 LT |
1179 | |
1180 | (*(struct sockaddr_in *)&ifr.ifr_addr).sin_family = AF_INET; | |
1181 | (*(struct sockaddr_in *)&ifr.ifr_addr).sin_addr.s_addr = | |
1182 | ifa->ifa_local; | |
1183 | ||
1184 | if (copy_to_user(buf, &ifr, sizeof(struct ifreq))) { | |
1185 | done = -EFAULT; | |
1186 | break; | |
1187 | } | |
1188 | buf += sizeof(struct ifreq); | |
1189 | len -= sizeof(struct ifreq); | |
1190 | done += sizeof(struct ifreq); | |
1191 | } | |
1192 | out: | |
1193 | return done; | |
1194 | } | |
1195 | ||
a61ced5d | 1196 | __be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope) |
1da177e4 | 1197 | { |
a61ced5d | 1198 | __be32 addr = 0; |
1da177e4 | 1199 | struct in_device *in_dev; |
c346dca1 | 1200 | struct net *net = dev_net(dev); |
3f2fb9a8 | 1201 | int master_idx; |
1da177e4 LT |
1202 | |
1203 | rcu_read_lock(); | |
e5ed6399 | 1204 | in_dev = __in_dev_get_rcu(dev); |
1da177e4 LT |
1205 | if (!in_dev) |
1206 | goto no_in_dev; | |
1207 | ||
1208 | for_primary_ifa(in_dev) { | |
1209 | if (ifa->ifa_scope > scope) | |
1210 | continue; | |
1211 | if (!dst || inet_ifa_match(dst, ifa)) { | |
1212 | addr = ifa->ifa_local; | |
1213 | break; | |
1214 | } | |
1215 | if (!addr) | |
1216 | addr = ifa->ifa_local; | |
1217 | } endfor_ifa(in_dev); | |
1da177e4 LT |
1218 | |
1219 | if (addr) | |
c6d14c84 | 1220 | goto out_unlock; |
9f9354b9 | 1221 | no_in_dev: |
3f2fb9a8 | 1222 | master_idx = l3mdev_master_ifindex_rcu(dev); |
1da177e4 | 1223 | |
17b693cd DL |
1224 | /* For VRFs, the VRF device takes the place of the loopback device, |
1225 | * with addresses on it being preferred. Note in such cases the | |
1226 | * loopback device will be among the devices that fail the master_idx | |
1227 | * equality check in the loop below. | |
1228 | */ | |
1229 | if (master_idx && | |
1230 | (dev = dev_get_by_index_rcu(net, master_idx)) && | |
1231 | (in_dev = __in_dev_get_rcu(dev))) { | |
1232 | for_primary_ifa(in_dev) { | |
1233 | if (ifa->ifa_scope != RT_SCOPE_LINK && | |
1234 | ifa->ifa_scope <= scope) { | |
1235 | addr = ifa->ifa_local; | |
1236 | goto out_unlock; | |
1237 | } | |
1238 | } endfor_ifa(in_dev); | |
1239 | } | |
1240 | ||
1da177e4 | 1241 | /* Not loopback addresses on loopback should be preferred |
ca9f1fd2 | 1242 | in this case. It is important that lo is the first interface |
1da177e4 LT |
1243 | in dev_base list. |
1244 | */ | |
c6d14c84 | 1245 | for_each_netdev_rcu(net, dev) { |
3f2fb9a8 DA |
1246 | if (l3mdev_master_ifindex_rcu(dev) != master_idx) |
1247 | continue; | |
1248 | ||
9f9354b9 ED |
1249 | in_dev = __in_dev_get_rcu(dev); |
1250 | if (!in_dev) | |
1da177e4 LT |
1251 | continue; |
1252 | ||
1253 | for_primary_ifa(in_dev) { | |
1254 | if (ifa->ifa_scope != RT_SCOPE_LINK && | |
1255 | ifa->ifa_scope <= scope) { | |
1256 | addr = ifa->ifa_local; | |
c6d14c84 | 1257 | goto out_unlock; |
1da177e4 LT |
1258 | } |
1259 | } endfor_ifa(in_dev); | |
1260 | } | |
c6d14c84 | 1261 | out_unlock: |
1da177e4 | 1262 | rcu_read_unlock(); |
1da177e4 LT |
1263 | return addr; |
1264 | } | |
9f9354b9 | 1265 | EXPORT_SYMBOL(inet_select_addr); |
1da177e4 | 1266 | |
60cad5da AV |
1267 | static __be32 confirm_addr_indev(struct in_device *in_dev, __be32 dst, |
1268 | __be32 local, int scope) | |
1da177e4 LT |
1269 | { |
1270 | int same = 0; | |
a144ea4b | 1271 | __be32 addr = 0; |
1da177e4 LT |
1272 | |
1273 | for_ifa(in_dev) { | |
1274 | if (!addr && | |
1275 | (local == ifa->ifa_local || !local) && | |
1276 | ifa->ifa_scope <= scope) { | |
1277 | addr = ifa->ifa_local; | |
1278 | if (same) | |
1279 | break; | |
1280 | } | |
1281 | if (!same) { | |
1282 | same = (!local || inet_ifa_match(local, ifa)) && | |
1283 | (!dst || inet_ifa_match(dst, ifa)); | |
1284 | if (same && addr) { | |
1285 | if (local || !dst) | |
1286 | break; | |
1287 | /* Is the selected addr into dst subnet? */ | |
1288 | if (inet_ifa_match(addr, ifa)) | |
1289 | break; | |
1290 | /* No, then can we use new local src? */ | |
1291 | if (ifa->ifa_scope <= scope) { | |
1292 | addr = ifa->ifa_local; | |
1293 | break; | |
1294 | } | |
1295 | /* search for large dst subnet for addr */ | |
1296 | same = 0; | |
1297 | } | |
1298 | } | |
1299 | } endfor_ifa(in_dev); | |
1300 | ||
9f9354b9 | 1301 | return same ? addr : 0; |
1da177e4 LT |
1302 | } |
1303 | ||
1304 | /* | |
1305 | * Confirm that local IP address exists using wildcards: | |
b601fa19 ND |
1306 | * - net: netns to check, cannot be NULL |
1307 | * - in_dev: only on this interface, NULL=any interface | |
1da177e4 LT |
1308 | * - dst: only in the same subnet as dst, 0=any dst |
1309 | * - local: address, 0=autoselect the local address | |
1310 | * - scope: maximum allowed scope value for the local address | |
1311 | */ | |
b601fa19 | 1312 | __be32 inet_confirm_addr(struct net *net, struct in_device *in_dev, |
9bd85e32 | 1313 | __be32 dst, __be32 local, int scope) |
1da177e4 | 1314 | { |
60cad5da | 1315 | __be32 addr = 0; |
9bd85e32 | 1316 | struct net_device *dev; |
1da177e4 | 1317 | |
00db4124 | 1318 | if (in_dev) |
9bd85e32 | 1319 | return confirm_addr_indev(in_dev, dst, local, scope); |
1da177e4 | 1320 | |
1da177e4 | 1321 | rcu_read_lock(); |
c6d14c84 | 1322 | for_each_netdev_rcu(net, dev) { |
9f9354b9 ED |
1323 | in_dev = __in_dev_get_rcu(dev); |
1324 | if (in_dev) { | |
1da177e4 LT |
1325 | addr = confirm_addr_indev(in_dev, dst, local, scope); |
1326 | if (addr) | |
1327 | break; | |
1328 | } | |
1329 | } | |
1330 | rcu_read_unlock(); | |
1da177e4 LT |
1331 | |
1332 | return addr; | |
1333 | } | |
eaddcd76 | 1334 | EXPORT_SYMBOL(inet_confirm_addr); |
1da177e4 LT |
1335 | |
1336 | /* | |
1337 | * Device notifier | |
1338 | */ | |
1339 | ||
1340 | int register_inetaddr_notifier(struct notifier_block *nb) | |
1341 | { | |
e041c683 | 1342 | return blocking_notifier_chain_register(&inetaddr_chain, nb); |
1da177e4 | 1343 | } |
9f9354b9 | 1344 | EXPORT_SYMBOL(register_inetaddr_notifier); |
1da177e4 LT |
1345 | |
1346 | int unregister_inetaddr_notifier(struct notifier_block *nb) | |
1347 | { | |
e041c683 | 1348 | return blocking_notifier_chain_unregister(&inetaddr_chain, nb); |
1da177e4 | 1349 | } |
9f9354b9 | 1350 | EXPORT_SYMBOL(unregister_inetaddr_notifier); |
1da177e4 | 1351 | |
9f9354b9 ED |
1352 | /* Rename ifa_labels for a device name change. Make some effort to preserve |
1353 | * existing alias numbering and to create unique labels if possible. | |
1da177e4 LT |
1354 | */ |
1355 | static void inetdev_changename(struct net_device *dev, struct in_device *in_dev) | |
e905a9ed | 1356 | { |
1da177e4 LT |
1357 | struct in_ifaddr *ifa; |
1358 | int named = 0; | |
1359 | ||
e905a9ed YH |
1360 | for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { |
1361 | char old[IFNAMSIZ], *dot; | |
1da177e4 LT |
1362 | |
1363 | memcpy(old, ifa->ifa_label, IFNAMSIZ); | |
e905a9ed | 1364 | memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); |
1da177e4 | 1365 | if (named++ == 0) |
573bf470 | 1366 | goto skip; |
44344b2a | 1367 | dot = strchr(old, ':'); |
51456b29 | 1368 | if (!dot) { |
e905a9ed | 1369 | sprintf(old, ":%d", named); |
1da177e4 LT |
1370 | dot = old; |
1371 | } | |
9f9354b9 | 1372 | if (strlen(dot) + strlen(dev->name) < IFNAMSIZ) |
e905a9ed | 1373 | strcat(ifa->ifa_label, dot); |
9f9354b9 | 1374 | else |
e905a9ed | 1375 | strcpy(ifa->ifa_label + (IFNAMSIZ - strlen(dot) - 1), dot); |
573bf470 TG |
1376 | skip: |
1377 | rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0); | |
e905a9ed YH |
1378 | } |
1379 | } | |
1da177e4 | 1380 | |
40384999 | 1381 | static bool inetdev_valid_mtu(unsigned int mtu) |
06770843 BL |
1382 | { |
1383 | return mtu >= 68; | |
1384 | } | |
1385 | ||
d11327ad IC |
1386 | static void inetdev_send_gratuitous_arp(struct net_device *dev, |
1387 | struct in_device *in_dev) | |
1388 | ||
1389 | { | |
b76d0789 | 1390 | struct in_ifaddr *ifa; |
d11327ad | 1391 | |
b76d0789 ZK |
1392 | for (ifa = in_dev->ifa_list; ifa; |
1393 | ifa = ifa->ifa_next) { | |
1394 | arp_send(ARPOP_REQUEST, ETH_P_ARP, | |
1395 | ifa->ifa_local, dev, | |
1396 | ifa->ifa_local, NULL, | |
1397 | dev->dev_addr, NULL); | |
1398 | } | |
d11327ad IC |
1399 | } |
1400 | ||
1da177e4 LT |
1401 | /* Called only under RTNL semaphore */ |
1402 | ||
1403 | static int inetdev_event(struct notifier_block *this, unsigned long event, | |
1404 | void *ptr) | |
1405 | { | |
351638e7 | 1406 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
748e2d93 | 1407 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
0115e8e3 | 1408 | |
1da177e4 LT |
1409 | ASSERT_RTNL(); |
1410 | ||
1411 | if (!in_dev) { | |
8030f544 | 1412 | if (event == NETDEV_REGISTER) { |
1da177e4 | 1413 | in_dev = inetdev_init(dev); |
20e61da7 WC |
1414 | if (IS_ERR(in_dev)) |
1415 | return notifier_from_errno(PTR_ERR(in_dev)); | |
0cc217e1 | 1416 | if (dev->flags & IFF_LOOPBACK) { |
42f811b8 HX |
1417 | IN_DEV_CONF_SET(in_dev, NOXFRM, 1); |
1418 | IN_DEV_CONF_SET(in_dev, NOPOLICY, 1); | |
8030f544 | 1419 | } |
06770843 BL |
1420 | } else if (event == NETDEV_CHANGEMTU) { |
1421 | /* Re-enabling IP */ | |
1422 | if (inetdev_valid_mtu(dev->mtu)) | |
1423 | in_dev = inetdev_init(dev); | |
1da177e4 LT |
1424 | } |
1425 | goto out; | |
1426 | } | |
1427 | ||
1428 | switch (event) { | |
1429 | case NETDEV_REGISTER: | |
91df42be | 1430 | pr_debug("%s: bug\n", __func__); |
a9b3cd7f | 1431 | RCU_INIT_POINTER(dev->ip_ptr, NULL); |
1da177e4 LT |
1432 | break; |
1433 | case NETDEV_UP: | |
06770843 | 1434 | if (!inetdev_valid_mtu(dev->mtu)) |
1da177e4 | 1435 | break; |
0cc217e1 | 1436 | if (dev->flags & IFF_LOOPBACK) { |
9f9354b9 ED |
1437 | struct in_ifaddr *ifa = inet_alloc_ifa(); |
1438 | ||
1439 | if (ifa) { | |
fd23c3b3 | 1440 | INIT_HLIST_NODE(&ifa->hash); |
1da177e4 LT |
1441 | ifa->ifa_local = |
1442 | ifa->ifa_address = htonl(INADDR_LOOPBACK); | |
1443 | ifa->ifa_prefixlen = 8; | |
1444 | ifa->ifa_mask = inet_make_mask(8); | |
1445 | in_dev_hold(in_dev); | |
1446 | ifa->ifa_dev = in_dev; | |
1447 | ifa->ifa_scope = RT_SCOPE_HOST; | |
1448 | memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); | |
5c766d64 JP |
1449 | set_ifa_lifetime(ifa, INFINITY_LIFE_TIME, |
1450 | INFINITY_LIFE_TIME); | |
dfd1582d JP |
1451 | ipv4_devconf_setall(in_dev); |
1452 | neigh_parms_data_state_setall(in_dev->arp_parms); | |
1da177e4 LT |
1453 | inet_insert_ifa(ifa); |
1454 | } | |
1455 | } | |
1456 | ip_mc_up(in_dev); | |
eefef1cf SH |
1457 | /* fall through */ |
1458 | case NETDEV_CHANGEADDR: | |
d11327ad IC |
1459 | if (!IN_DEV_ARP_NOTIFY(in_dev)) |
1460 | break; | |
1461 | /* fall through */ | |
1462 | case NETDEV_NOTIFY_PEERS: | |
a21090cf | 1463 | /* Send gratuitous ARP to notify of link change */ |
d11327ad | 1464 | inetdev_send_gratuitous_arp(dev, in_dev); |
1da177e4 LT |
1465 | break; |
1466 | case NETDEV_DOWN: | |
1467 | ip_mc_down(in_dev); | |
1468 | break; | |
93d9b7d7 | 1469 | case NETDEV_PRE_TYPE_CHANGE: |
75c78500 MS |
1470 | ip_mc_unmap(in_dev); |
1471 | break; | |
93d9b7d7 | 1472 | case NETDEV_POST_TYPE_CHANGE: |
75c78500 MS |
1473 | ip_mc_remap(in_dev); |
1474 | break; | |
1da177e4 | 1475 | case NETDEV_CHANGEMTU: |
06770843 | 1476 | if (inetdev_valid_mtu(dev->mtu)) |
1da177e4 | 1477 | break; |
06770843 | 1478 | /* disable IP when MTU is not enough */ |
1da177e4 LT |
1479 | case NETDEV_UNREGISTER: |
1480 | inetdev_destroy(in_dev); | |
1481 | break; | |
1482 | case NETDEV_CHANGENAME: | |
1483 | /* Do not notify about label change, this event is | |
1484 | * not interesting to applications using netlink. | |
1485 | */ | |
1486 | inetdev_changename(dev, in_dev); | |
1487 | ||
51602b2a | 1488 | devinet_sysctl_unregister(in_dev); |
66f27a52 | 1489 | devinet_sysctl_register(in_dev); |
1da177e4 LT |
1490 | break; |
1491 | } | |
1492 | out: | |
1493 | return NOTIFY_DONE; | |
1494 | } | |
1495 | ||
1496 | static struct notifier_block ip_netdev_notifier = { | |
539afedf | 1497 | .notifier_call = inetdev_event, |
1da177e4 LT |
1498 | }; |
1499 | ||
40384999 | 1500 | static size_t inet_nlmsg_size(void) |
339bf98f TG |
1501 | { |
1502 | return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) | |
1503 | + nla_total_size(4) /* IFA_ADDRESS */ | |
1504 | + nla_total_size(4) /* IFA_LOCAL */ | |
1505 | + nla_total_size(4) /* IFA_BROADCAST */ | |
ad6c8135 | 1506 | + nla_total_size(IFNAMSIZ) /* IFA_LABEL */ |
63b5f152 GU |
1507 | + nla_total_size(4) /* IFA_FLAGS */ |
1508 | + nla_total_size(sizeof(struct ifa_cacheinfo)); /* IFA_CACHEINFO */ | |
339bf98f TG |
1509 | } |
1510 | ||
5c766d64 JP |
1511 | static inline u32 cstamp_delta(unsigned long cstamp) |
1512 | { | |
1513 | return (cstamp - INITIAL_JIFFIES) * 100UL / HZ; | |
1514 | } | |
1515 | ||
1516 | static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, | |
1517 | unsigned long tstamp, u32 preferred, u32 valid) | |
1518 | { | |
1519 | struct ifa_cacheinfo ci; | |
1520 | ||
1521 | ci.cstamp = cstamp_delta(cstamp); | |
1522 | ci.tstamp = cstamp_delta(tstamp); | |
1523 | ci.ifa_prefered = preferred; | |
1524 | ci.ifa_valid = valid; | |
1525 | ||
1526 | return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); | |
1527 | } | |
1528 | ||
1da177e4 | 1529 | static int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa, |
15e47304 | 1530 | u32 portid, u32 seq, int event, unsigned int flags) |
1da177e4 LT |
1531 | { |
1532 | struct ifaddrmsg *ifm; | |
1533 | struct nlmsghdr *nlh; | |
5c766d64 | 1534 | u32 preferred, valid; |
1da177e4 | 1535 | |
15e47304 | 1536 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*ifm), flags); |
51456b29 | 1537 | if (!nlh) |
26932566 | 1538 | return -EMSGSIZE; |
47f68512 TG |
1539 | |
1540 | ifm = nlmsg_data(nlh); | |
1da177e4 LT |
1541 | ifm->ifa_family = AF_INET; |
1542 | ifm->ifa_prefixlen = ifa->ifa_prefixlen; | |
5c766d64 | 1543 | ifm->ifa_flags = ifa->ifa_flags; |
1da177e4 LT |
1544 | ifm->ifa_scope = ifa->ifa_scope; |
1545 | ifm->ifa_index = ifa->ifa_dev->dev->ifindex; | |
47f68512 | 1546 | |
5c766d64 JP |
1547 | if (!(ifm->ifa_flags & IFA_F_PERMANENT)) { |
1548 | preferred = ifa->ifa_preferred_lft; | |
1549 | valid = ifa->ifa_valid_lft; | |
1550 | if (preferred != INFINITY_LIFE_TIME) { | |
1551 | long tval = (jiffies - ifa->ifa_tstamp) / HZ; | |
1552 | ||
1553 | if (preferred > tval) | |
1554 | preferred -= tval; | |
1555 | else | |
1556 | preferred = 0; | |
1557 | if (valid != INFINITY_LIFE_TIME) { | |
1558 | if (valid > tval) | |
1559 | valid -= tval; | |
1560 | else | |
1561 | valid = 0; | |
1562 | } | |
1563 | } | |
1564 | } else { | |
1565 | preferred = INFINITY_LIFE_TIME; | |
1566 | valid = INFINITY_LIFE_TIME; | |
1567 | } | |
f3756b79 | 1568 | if ((ifa->ifa_address && |
930345ea | 1569 | nla_put_in_addr(skb, IFA_ADDRESS, ifa->ifa_address)) || |
f3756b79 | 1570 | (ifa->ifa_local && |
930345ea | 1571 | nla_put_in_addr(skb, IFA_LOCAL, ifa->ifa_local)) || |
f3756b79 | 1572 | (ifa->ifa_broadcast && |
930345ea | 1573 | nla_put_in_addr(skb, IFA_BROADCAST, ifa->ifa_broadcast)) || |
f3756b79 | 1574 | (ifa->ifa_label[0] && |
5c766d64 | 1575 | nla_put_string(skb, IFA_LABEL, ifa->ifa_label)) || |
ad6c8135 | 1576 | nla_put_u32(skb, IFA_FLAGS, ifa->ifa_flags) || |
5c766d64 JP |
1577 | put_cacheinfo(skb, ifa->ifa_cstamp, ifa->ifa_tstamp, |
1578 | preferred, valid)) | |
f3756b79 | 1579 | goto nla_put_failure; |
1da177e4 | 1580 | |
053c095a JB |
1581 | nlmsg_end(skb, nlh); |
1582 | return 0; | |
47f68512 TG |
1583 | |
1584 | nla_put_failure: | |
26932566 PM |
1585 | nlmsg_cancel(skb, nlh); |
1586 | return -EMSGSIZE; | |
1da177e4 LT |
1587 | } |
1588 | ||
1589 | static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) | |
1590 | { | |
3b1e0a65 | 1591 | struct net *net = sock_net(skb->sk); |
eec4df98 ED |
1592 | int h, s_h; |
1593 | int idx, s_idx; | |
1594 | int ip_idx, s_ip_idx; | |
1da177e4 LT |
1595 | struct net_device *dev; |
1596 | struct in_device *in_dev; | |
1597 | struct in_ifaddr *ifa; | |
eec4df98 | 1598 | struct hlist_head *head; |
1da177e4 | 1599 | |
eec4df98 ED |
1600 | s_h = cb->args[0]; |
1601 | s_idx = idx = cb->args[1]; | |
1602 | s_ip_idx = ip_idx = cb->args[2]; | |
1603 | ||
1604 | for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { | |
1605 | idx = 0; | |
1606 | head = &net->dev_index_head[h]; | |
1607 | rcu_read_lock(); | |
0465277f ND |
1608 | cb->seq = atomic_read(&net->ipv4.dev_addr_genid) ^ |
1609 | net->dev_base_seq; | |
b67bfe0d | 1610 | hlist_for_each_entry_rcu(dev, head, index_hlist) { |
eec4df98 ED |
1611 | if (idx < s_idx) |
1612 | goto cont; | |
4b97efdf | 1613 | if (h > s_h || idx > s_idx) |
eec4df98 ED |
1614 | s_ip_idx = 0; |
1615 | in_dev = __in_dev_get_rcu(dev); | |
1616 | if (!in_dev) | |
1617 | goto cont; | |
1da177e4 | 1618 | |
eec4df98 ED |
1619 | for (ifa = in_dev->ifa_list, ip_idx = 0; ifa; |
1620 | ifa = ifa->ifa_next, ip_idx++) { | |
1621 | if (ip_idx < s_ip_idx) | |
1622 | continue; | |
1623 | if (inet_fill_ifaddr(skb, ifa, | |
15e47304 | 1624 | NETLINK_CB(cb->skb).portid, |
1da177e4 | 1625 | cb->nlh->nlmsg_seq, |
053c095a | 1626 | RTM_NEWADDR, NLM_F_MULTI) < 0) { |
eec4df98 ED |
1627 | rcu_read_unlock(); |
1628 | goto done; | |
1629 | } | |
0465277f | 1630 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); |
eec4df98 | 1631 | } |
7562f876 | 1632 | cont: |
eec4df98 ED |
1633 | idx++; |
1634 | } | |
1635 | rcu_read_unlock(); | |
1da177e4 LT |
1636 | } |
1637 | ||
1638 | done: | |
eec4df98 ED |
1639 | cb->args[0] = h; |
1640 | cb->args[1] = idx; | |
1641 | cb->args[2] = ip_idx; | |
1da177e4 LT |
1642 | |
1643 | return skb->len; | |
1644 | } | |
1645 | ||
539afedf | 1646 | static void rtmsg_ifa(int event, struct in_ifaddr *ifa, struct nlmsghdr *nlh, |
15e47304 | 1647 | u32 portid) |
1da177e4 | 1648 | { |
47f68512 | 1649 | struct sk_buff *skb; |
d6062cbb TG |
1650 | u32 seq = nlh ? nlh->nlmsg_seq : 0; |
1651 | int err = -ENOBUFS; | |
4b8aa9ab | 1652 | struct net *net; |
1da177e4 | 1653 | |
c346dca1 | 1654 | net = dev_net(ifa->ifa_dev->dev); |
339bf98f | 1655 | skb = nlmsg_new(inet_nlmsg_size(), GFP_KERNEL); |
51456b29 | 1656 | if (!skb) |
d6062cbb TG |
1657 | goto errout; |
1658 | ||
15e47304 | 1659 | err = inet_fill_ifaddr(skb, ifa, portid, seq, event, 0); |
26932566 PM |
1660 | if (err < 0) { |
1661 | /* -EMSGSIZE implies BUG in inet_nlmsg_size() */ | |
1662 | WARN_ON(err == -EMSGSIZE); | |
1663 | kfree_skb(skb); | |
1664 | goto errout; | |
1665 | } | |
15e47304 | 1666 | rtnl_notify(skb, net, portid, RTNLGRP_IPV4_IFADDR, nlh, GFP_KERNEL); |
1ce85fe4 | 1667 | return; |
d6062cbb TG |
1668 | errout: |
1669 | if (err < 0) | |
4b8aa9ab | 1670 | rtnl_set_sk_err(net, RTNLGRP_IPV4_IFADDR, err); |
1da177e4 LT |
1671 | } |
1672 | ||
b1974ed0 AR |
1673 | static size_t inet_get_link_af_size(const struct net_device *dev, |
1674 | u32 ext_filter_mask) | |
9f0f7272 | 1675 | { |
1fc19aff | 1676 | struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr); |
9f0f7272 TG |
1677 | |
1678 | if (!in_dev) | |
1679 | return 0; | |
1680 | ||
1681 | return nla_total_size(IPV4_DEVCONF_MAX * 4); /* IFLA_INET_CONF */ | |
1682 | } | |
1683 | ||
d5566fd7 SV |
1684 | static int inet_fill_link_af(struct sk_buff *skb, const struct net_device *dev, |
1685 | u32 ext_filter_mask) | |
9f0f7272 | 1686 | { |
1fc19aff | 1687 | struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr); |
9f0f7272 TG |
1688 | struct nlattr *nla; |
1689 | int i; | |
1690 | ||
1691 | if (!in_dev) | |
1692 | return -ENODATA; | |
1693 | ||
1694 | nla = nla_reserve(skb, IFLA_INET_CONF, IPV4_DEVCONF_MAX * 4); | |
51456b29 | 1695 | if (!nla) |
9f0f7272 TG |
1696 | return -EMSGSIZE; |
1697 | ||
1698 | for (i = 0; i < IPV4_DEVCONF_MAX; i++) | |
1699 | ((u32 *) nla_data(nla))[i] = in_dev->cnf.data[i]; | |
1700 | ||
1701 | return 0; | |
1702 | } | |
1703 | ||
1704 | static const struct nla_policy inet_af_policy[IFLA_INET_MAX+1] = { | |
1705 | [IFLA_INET_CONF] = { .type = NLA_NESTED }, | |
1706 | }; | |
1707 | ||
cf7afbfe TG |
1708 | static int inet_validate_link_af(const struct net_device *dev, |
1709 | const struct nlattr *nla) | |
9f0f7272 | 1710 | { |
9f0f7272 TG |
1711 | struct nlattr *a, *tb[IFLA_INET_MAX+1]; |
1712 | int err, rem; | |
1713 | ||
f7fce74e | 1714 | if (dev && !__in_dev_get_rtnl(dev)) |
cf7afbfe | 1715 | return -EAFNOSUPPORT; |
9f0f7272 TG |
1716 | |
1717 | err = nla_parse_nested(tb, IFLA_INET_MAX, nla, inet_af_policy); | |
1718 | if (err < 0) | |
1719 | return err; | |
1720 | ||
1721 | if (tb[IFLA_INET_CONF]) { | |
1722 | nla_for_each_nested(a, tb[IFLA_INET_CONF], rem) { | |
1723 | int cfgid = nla_type(a); | |
1724 | ||
1725 | if (nla_len(a) < 4) | |
1726 | return -EINVAL; | |
1727 | ||
1728 | if (cfgid <= 0 || cfgid > IPV4_DEVCONF_MAX) | |
1729 | return -EINVAL; | |
1730 | } | |
1731 | } | |
1732 | ||
cf7afbfe TG |
1733 | return 0; |
1734 | } | |
1735 | ||
1736 | static int inet_set_link_af(struct net_device *dev, const struct nlattr *nla) | |
1737 | { | |
f7fce74e | 1738 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
cf7afbfe TG |
1739 | struct nlattr *a, *tb[IFLA_INET_MAX+1]; |
1740 | int rem; | |
1741 | ||
1742 | if (!in_dev) | |
1743 | return -EAFNOSUPPORT; | |
1744 | ||
1745 | if (nla_parse_nested(tb, IFLA_INET_MAX, nla, NULL) < 0) | |
1746 | BUG(); | |
1747 | ||
9f0f7272 TG |
1748 | if (tb[IFLA_INET_CONF]) { |
1749 | nla_for_each_nested(a, tb[IFLA_INET_CONF], rem) | |
1750 | ipv4_devconf_set(in_dev, nla_type(a), nla_get_u32(a)); | |
1751 | } | |
1752 | ||
1753 | return 0; | |
1754 | } | |
1755 | ||
edc9e748 ND |
1756 | static int inet_netconf_msgsize_devconf(int type) |
1757 | { | |
1758 | int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) | |
1759 | + nla_total_size(4); /* NETCONFA_IFINDEX */ | |
136ba622 | 1760 | bool all = false; |
edc9e748 | 1761 | |
136ba622 ZS |
1762 | if (type == NETCONFA_ALL) |
1763 | all = true; | |
1764 | ||
1765 | if (all || type == NETCONFA_FORWARDING) | |
edc9e748 | 1766 | size += nla_total_size(4); |
136ba622 | 1767 | if (all || type == NETCONFA_RP_FILTER) |
cc535dfb | 1768 | size += nla_total_size(4); |
136ba622 | 1769 | if (all || type == NETCONFA_MC_FORWARDING) |
d67b8c61 | 1770 | size += nla_total_size(4); |
136ba622 | 1771 | if (all || type == NETCONFA_PROXY_NEIGH) |
f085ff1c | 1772 | size += nla_total_size(4); |
136ba622 | 1773 | if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) |
974d7af5 | 1774 | size += nla_total_size(4); |
edc9e748 ND |
1775 | |
1776 | return size; | |
1777 | } | |
1778 | ||
1779 | static int inet_netconf_fill_devconf(struct sk_buff *skb, int ifindex, | |
1780 | struct ipv4_devconf *devconf, u32 portid, | |
1781 | u32 seq, int event, unsigned int flags, | |
1782 | int type) | |
1783 | { | |
1784 | struct nlmsghdr *nlh; | |
1785 | struct netconfmsg *ncm; | |
136ba622 | 1786 | bool all = false; |
edc9e748 ND |
1787 | |
1788 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), | |
1789 | flags); | |
51456b29 | 1790 | if (!nlh) |
edc9e748 ND |
1791 | return -EMSGSIZE; |
1792 | ||
136ba622 ZS |
1793 | if (type == NETCONFA_ALL) |
1794 | all = true; | |
1795 | ||
edc9e748 ND |
1796 | ncm = nlmsg_data(nlh); |
1797 | ncm->ncm_family = AF_INET; | |
1798 | ||
1799 | if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0) | |
1800 | goto nla_put_failure; | |
1801 | ||
136ba622 | 1802 | if ((all || type == NETCONFA_FORWARDING) && |
edc9e748 ND |
1803 | nla_put_s32(skb, NETCONFA_FORWARDING, |
1804 | IPV4_DEVCONF(*devconf, FORWARDING)) < 0) | |
1805 | goto nla_put_failure; | |
136ba622 | 1806 | if ((all || type == NETCONFA_RP_FILTER) && |
cc535dfb ND |
1807 | nla_put_s32(skb, NETCONFA_RP_FILTER, |
1808 | IPV4_DEVCONF(*devconf, RP_FILTER)) < 0) | |
1809 | goto nla_put_failure; | |
136ba622 | 1810 | if ((all || type == NETCONFA_MC_FORWARDING) && |
d67b8c61 ND |
1811 | nla_put_s32(skb, NETCONFA_MC_FORWARDING, |
1812 | IPV4_DEVCONF(*devconf, MC_FORWARDING)) < 0) | |
1813 | goto nla_put_failure; | |
136ba622 | 1814 | if ((all || type == NETCONFA_PROXY_NEIGH) && |
09aea5df | 1815 | nla_put_s32(skb, NETCONFA_PROXY_NEIGH, |
f085ff1c | 1816 | IPV4_DEVCONF(*devconf, PROXY_ARP)) < 0) |
1817 | goto nla_put_failure; | |
136ba622 | 1818 | if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) && |
974d7af5 AG |
1819 | nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, |
1820 | IPV4_DEVCONF(*devconf, IGNORE_ROUTES_WITH_LINKDOWN)) < 0) | |
1821 | goto nla_put_failure; | |
edc9e748 | 1822 | |
053c095a JB |
1823 | nlmsg_end(skb, nlh); |
1824 | return 0; | |
edc9e748 ND |
1825 | |
1826 | nla_put_failure: | |
1827 | nlmsg_cancel(skb, nlh); | |
1828 | return -EMSGSIZE; | |
1829 | } | |
1830 | ||
d67b8c61 ND |
1831 | void inet_netconf_notify_devconf(struct net *net, int type, int ifindex, |
1832 | struct ipv4_devconf *devconf) | |
edc9e748 ND |
1833 | { |
1834 | struct sk_buff *skb; | |
1835 | int err = -ENOBUFS; | |
1836 | ||
fa17806c | 1837 | skb = nlmsg_new(inet_netconf_msgsize_devconf(type), GFP_KERNEL); |
51456b29 | 1838 | if (!skb) |
edc9e748 ND |
1839 | goto errout; |
1840 | ||
1841 | err = inet_netconf_fill_devconf(skb, ifindex, devconf, 0, 0, | |
1842 | RTM_NEWNETCONF, 0, type); | |
1843 | if (err < 0) { | |
1844 | /* -EMSGSIZE implies BUG in inet_netconf_msgsize_devconf() */ | |
1845 | WARN_ON(err == -EMSGSIZE); | |
1846 | kfree_skb(skb); | |
1847 | goto errout; | |
1848 | } | |
fa17806c | 1849 | rtnl_notify(skb, net, 0, RTNLGRP_IPV4_NETCONF, NULL, GFP_KERNEL); |
edc9e748 ND |
1850 | return; |
1851 | errout: | |
1852 | if (err < 0) | |
1853 | rtnl_set_sk_err(net, RTNLGRP_IPV4_NETCONF, err); | |
1854 | } | |
1855 | ||
9e551110 ND |
1856 | static const struct nla_policy devconf_ipv4_policy[NETCONFA_MAX+1] = { |
1857 | [NETCONFA_IFINDEX] = { .len = sizeof(int) }, | |
1858 | [NETCONFA_FORWARDING] = { .len = sizeof(int) }, | |
cc535dfb | 1859 | [NETCONFA_RP_FILTER] = { .len = sizeof(int) }, |
09aea5df | 1860 | [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) }, |
974d7af5 | 1861 | [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) }, |
9e551110 ND |
1862 | }; |
1863 | ||
1864 | static int inet_netconf_get_devconf(struct sk_buff *in_skb, | |
661d2967 | 1865 | struct nlmsghdr *nlh) |
9e551110 ND |
1866 | { |
1867 | struct net *net = sock_net(in_skb->sk); | |
1868 | struct nlattr *tb[NETCONFA_MAX+1]; | |
1869 | struct netconfmsg *ncm; | |
1870 | struct sk_buff *skb; | |
1871 | struct ipv4_devconf *devconf; | |
1872 | struct in_device *in_dev; | |
1873 | struct net_device *dev; | |
1874 | int ifindex; | |
1875 | int err; | |
1876 | ||
1877 | err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX, | |
1878 | devconf_ipv4_policy); | |
1879 | if (err < 0) | |
1880 | goto errout; | |
1881 | ||
a97eb33f | 1882 | err = -EINVAL; |
9e551110 ND |
1883 | if (!tb[NETCONFA_IFINDEX]) |
1884 | goto errout; | |
1885 | ||
1886 | ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); | |
1887 | switch (ifindex) { | |
1888 | case NETCONFA_IFINDEX_ALL: | |
1889 | devconf = net->ipv4.devconf_all; | |
1890 | break; | |
1891 | case NETCONFA_IFINDEX_DEFAULT: | |
1892 | devconf = net->ipv4.devconf_dflt; | |
1893 | break; | |
1894 | default: | |
1895 | dev = __dev_get_by_index(net, ifindex); | |
51456b29 | 1896 | if (!dev) |
9e551110 ND |
1897 | goto errout; |
1898 | in_dev = __in_dev_get_rtnl(dev); | |
51456b29 | 1899 | if (!in_dev) |
9e551110 ND |
1900 | goto errout; |
1901 | devconf = &in_dev->cnf; | |
1902 | break; | |
1903 | } | |
1904 | ||
1905 | err = -ENOBUFS; | |
fa17806c | 1906 | skb = nlmsg_new(inet_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL); |
51456b29 | 1907 | if (!skb) |
9e551110 ND |
1908 | goto errout; |
1909 | ||
1910 | err = inet_netconf_fill_devconf(skb, ifindex, devconf, | |
1911 | NETLINK_CB(in_skb).portid, | |
1912 | nlh->nlmsg_seq, RTM_NEWNETCONF, 0, | |
136ba622 | 1913 | NETCONFA_ALL); |
9e551110 ND |
1914 | if (err < 0) { |
1915 | /* -EMSGSIZE implies BUG in inet_netconf_msgsize_devconf() */ | |
1916 | WARN_ON(err == -EMSGSIZE); | |
1917 | kfree_skb(skb); | |
1918 | goto errout; | |
1919 | } | |
1920 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); | |
1921 | errout: | |
1922 | return err; | |
1923 | } | |
1924 | ||
7a674200 ND |
1925 | static int inet_netconf_dump_devconf(struct sk_buff *skb, |
1926 | struct netlink_callback *cb) | |
1927 | { | |
1928 | struct net *net = sock_net(skb->sk); | |
1929 | int h, s_h; | |
1930 | int idx, s_idx; | |
1931 | struct net_device *dev; | |
1932 | struct in_device *in_dev; | |
1933 | struct hlist_head *head; | |
1934 | ||
1935 | s_h = cb->args[0]; | |
1936 | s_idx = idx = cb->args[1]; | |
1937 | ||
1938 | for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { | |
1939 | idx = 0; | |
1940 | head = &net->dev_index_head[h]; | |
1941 | rcu_read_lock(); | |
0465277f ND |
1942 | cb->seq = atomic_read(&net->ipv4.dev_addr_genid) ^ |
1943 | net->dev_base_seq; | |
7a674200 ND |
1944 | hlist_for_each_entry_rcu(dev, head, index_hlist) { |
1945 | if (idx < s_idx) | |
1946 | goto cont; | |
1947 | in_dev = __in_dev_get_rcu(dev); | |
1948 | if (!in_dev) | |
1949 | goto cont; | |
1950 | ||
1951 | if (inet_netconf_fill_devconf(skb, dev->ifindex, | |
1952 | &in_dev->cnf, | |
1953 | NETLINK_CB(cb->skb).portid, | |
1954 | cb->nlh->nlmsg_seq, | |
1955 | RTM_NEWNETCONF, | |
1956 | NLM_F_MULTI, | |
136ba622 | 1957 | NETCONFA_ALL) < 0) { |
7a674200 ND |
1958 | rcu_read_unlock(); |
1959 | goto done; | |
1960 | } | |
0465277f | 1961 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); |
7a674200 ND |
1962 | cont: |
1963 | idx++; | |
1964 | } | |
1965 | rcu_read_unlock(); | |
1966 | } | |
1967 | if (h == NETDEV_HASHENTRIES) { | |
1968 | if (inet_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL, | |
1969 | net->ipv4.devconf_all, | |
1970 | NETLINK_CB(cb->skb).portid, | |
1971 | cb->nlh->nlmsg_seq, | |
1972 | RTM_NEWNETCONF, NLM_F_MULTI, | |
136ba622 | 1973 | NETCONFA_ALL) < 0) |
7a674200 ND |
1974 | goto done; |
1975 | else | |
1976 | h++; | |
1977 | } | |
1978 | if (h == NETDEV_HASHENTRIES + 1) { | |
1979 | if (inet_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT, | |
1980 | net->ipv4.devconf_dflt, | |
1981 | NETLINK_CB(cb->skb).portid, | |
1982 | cb->nlh->nlmsg_seq, | |
1983 | RTM_NEWNETCONF, NLM_F_MULTI, | |
136ba622 | 1984 | NETCONFA_ALL) < 0) |
7a674200 ND |
1985 | goto done; |
1986 | else | |
1987 | h++; | |
1988 | } | |
1989 | done: | |
1990 | cb->args[0] = h; | |
1991 | cb->args[1] = idx; | |
1992 | ||
1993 | return skb->len; | |
1994 | } | |
1995 | ||
1da177e4 LT |
1996 | #ifdef CONFIG_SYSCTL |
1997 | ||
c0ce9fb3 | 1998 | static void devinet_copy_dflt_conf(struct net *net, int i) |
31be3085 HX |
1999 | { |
2000 | struct net_device *dev; | |
2001 | ||
c6d14c84 ED |
2002 | rcu_read_lock(); |
2003 | for_each_netdev_rcu(net, dev) { | |
31be3085 | 2004 | struct in_device *in_dev; |
c6d14c84 | 2005 | |
31be3085 HX |
2006 | in_dev = __in_dev_get_rcu(dev); |
2007 | if (in_dev && !test_bit(i, in_dev->cnf.state)) | |
9355bbd6 | 2008 | in_dev->cnf.data[i] = net->ipv4.devconf_dflt->data[i]; |
31be3085 | 2009 | } |
c6d14c84 | 2010 | rcu_read_unlock(); |
31be3085 HX |
2011 | } |
2012 | ||
c6d14c84 | 2013 | /* called with RTNL locked */ |
c0ce9fb3 | 2014 | static void inet_forward_change(struct net *net) |
68dd299b PE |
2015 | { |
2016 | struct net_device *dev; | |
586f1211 | 2017 | int on = IPV4_DEVCONF_ALL(net, FORWARDING); |
68dd299b | 2018 | |
586f1211 | 2019 | IPV4_DEVCONF_ALL(net, ACCEPT_REDIRECTS) = !on; |
9355bbd6 | 2020 | IPV4_DEVCONF_DFLT(net, FORWARDING) = on; |
edc9e748 ND |
2021 | inet_netconf_notify_devconf(net, NETCONFA_FORWARDING, |
2022 | NETCONFA_IFINDEX_ALL, | |
2023 | net->ipv4.devconf_all); | |
2024 | inet_netconf_notify_devconf(net, NETCONFA_FORWARDING, | |
2025 | NETCONFA_IFINDEX_DEFAULT, | |
2026 | net->ipv4.devconf_dflt); | |
68dd299b | 2027 | |
c0ce9fb3 | 2028 | for_each_netdev(net, dev) { |
68dd299b | 2029 | struct in_device *in_dev; |
fa17806c | 2030 | |
0187bdfb BH |
2031 | if (on) |
2032 | dev_disable_lro(dev); | |
fa17806c ED |
2033 | |
2034 | in_dev = __in_dev_get_rtnl(dev); | |
edc9e748 | 2035 | if (in_dev) { |
68dd299b | 2036 | IN_DEV_CONF_SET(in_dev, FORWARDING, on); |
edc9e748 ND |
2037 | inet_netconf_notify_devconf(net, NETCONFA_FORWARDING, |
2038 | dev->ifindex, &in_dev->cnf); | |
2039 | } | |
68dd299b | 2040 | } |
68dd299b PE |
2041 | } |
2042 | ||
f085ff1c | 2043 | static int devinet_conf_ifindex(struct net *net, struct ipv4_devconf *cnf) |
2044 | { | |
2045 | if (cnf == net->ipv4.devconf_dflt) | |
2046 | return NETCONFA_IFINDEX_DEFAULT; | |
2047 | else if (cnf == net->ipv4.devconf_all) | |
2048 | return NETCONFA_IFINDEX_ALL; | |
2049 | else { | |
2050 | struct in_device *idev | |
2051 | = container_of(cnf, struct in_device, cnf); | |
2052 | return idev->dev->ifindex; | |
2053 | } | |
2054 | } | |
2055 | ||
fe2c6338 | 2056 | static int devinet_conf_proc(struct ctl_table *ctl, int write, |
8d65af78 | 2057 | void __user *buffer, |
31be3085 HX |
2058 | size_t *lenp, loff_t *ppos) |
2059 | { | |
d01ff0a0 | 2060 | int old_value = *(int *)ctl->data; |
8d65af78 | 2061 | int ret = proc_dointvec(ctl, write, buffer, lenp, ppos); |
d01ff0a0 | 2062 | int new_value = *(int *)ctl->data; |
31be3085 HX |
2063 | |
2064 | if (write) { | |
2065 | struct ipv4_devconf *cnf = ctl->extra1; | |
c0ce9fb3 | 2066 | struct net *net = ctl->extra2; |
31be3085 | 2067 | int i = (int *)ctl->data - cnf->data; |
f085ff1c | 2068 | int ifindex; |
31be3085 HX |
2069 | |
2070 | set_bit(i, cnf->state); | |
2071 | ||
9355bbd6 | 2072 | if (cnf == net->ipv4.devconf_dflt) |
c0ce9fb3 | 2073 | devinet_copy_dflt_conf(net, i); |
d0daebc3 TG |
2074 | if (i == IPV4_DEVCONF_ACCEPT_LOCAL - 1 || |
2075 | i == IPV4_DEVCONF_ROUTE_LOCALNET - 1) | |
d01ff0a0 | 2076 | if ((new_value == 0) && (old_value != 0)) |
4ccfe6d4 | 2077 | rt_cache_flush(net); |
f085ff1c | 2078 | |
cc535dfb ND |
2079 | if (i == IPV4_DEVCONF_RP_FILTER - 1 && |
2080 | new_value != old_value) { | |
f085ff1c | 2081 | ifindex = devinet_conf_ifindex(net, cnf); |
cc535dfb ND |
2082 | inet_netconf_notify_devconf(net, NETCONFA_RP_FILTER, |
2083 | ifindex, cnf); | |
2084 | } | |
f085ff1c | 2085 | if (i == IPV4_DEVCONF_PROXY_ARP - 1 && |
2086 | new_value != old_value) { | |
2087 | ifindex = devinet_conf_ifindex(net, cnf); | |
09aea5df | 2088 | inet_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH, |
f085ff1c | 2089 | ifindex, cnf); |
2090 | } | |
974d7af5 AG |
2091 | if (i == IPV4_DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN - 1 && |
2092 | new_value != old_value) { | |
2093 | ifindex = devinet_conf_ifindex(net, cnf); | |
2094 | inet_netconf_notify_devconf(net, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, | |
2095 | ifindex, cnf); | |
2096 | } | |
31be3085 HX |
2097 | } |
2098 | ||
2099 | return ret; | |
2100 | } | |
2101 | ||
fe2c6338 | 2102 | static int devinet_sysctl_forward(struct ctl_table *ctl, int write, |
8d65af78 | 2103 | void __user *buffer, |
1da177e4 LT |
2104 | size_t *lenp, loff_t *ppos) |
2105 | { | |
2106 | int *valp = ctl->data; | |
2107 | int val = *valp; | |
88af182e | 2108 | loff_t pos = *ppos; |
8d65af78 | 2109 | int ret = proc_dointvec(ctl, write, buffer, lenp, ppos); |
1da177e4 LT |
2110 | |
2111 | if (write && *valp != val) { | |
c0ce9fb3 PE |
2112 | struct net *net = ctl->extra2; |
2113 | ||
0187bdfb | 2114 | if (valp != &IPV4_DEVCONF_DFLT(net, FORWARDING)) { |
88af182e EB |
2115 | if (!rtnl_trylock()) { |
2116 | /* Restore the original values before restarting */ | |
2117 | *valp = val; | |
2118 | *ppos = pos; | |
9b8adb5e | 2119 | return restart_syscall(); |
88af182e | 2120 | } |
0187bdfb BH |
2121 | if (valp == &IPV4_DEVCONF_ALL(net, FORWARDING)) { |
2122 | inet_forward_change(net); | |
edc9e748 | 2123 | } else { |
0187bdfb BH |
2124 | struct ipv4_devconf *cnf = ctl->extra1; |
2125 | struct in_device *idev = | |
2126 | container_of(cnf, struct in_device, cnf); | |
edc9e748 ND |
2127 | if (*valp) |
2128 | dev_disable_lro(idev->dev); | |
2129 | inet_netconf_notify_devconf(net, | |
2130 | NETCONFA_FORWARDING, | |
2131 | idev->dev->ifindex, | |
2132 | cnf); | |
0187bdfb BH |
2133 | } |
2134 | rtnl_unlock(); | |
4ccfe6d4 | 2135 | rt_cache_flush(net); |
edc9e748 ND |
2136 | } else |
2137 | inet_netconf_notify_devconf(net, NETCONFA_FORWARDING, | |
2138 | NETCONFA_IFINDEX_DEFAULT, | |
2139 | net->ipv4.devconf_dflt); | |
1da177e4 LT |
2140 | } |
2141 | ||
2142 | return ret; | |
2143 | } | |
2144 | ||
fe2c6338 | 2145 | static int ipv4_doint_and_flush(struct ctl_table *ctl, int write, |
323e126f DM |
2146 | void __user *buffer, |
2147 | size_t *lenp, loff_t *ppos) | |
1da177e4 LT |
2148 | { |
2149 | int *valp = ctl->data; | |
2150 | int val = *valp; | |
8d65af78 | 2151 | int ret = proc_dointvec(ctl, write, buffer, lenp, ppos); |
76e6ebfb | 2152 | struct net *net = ctl->extra2; |
1da177e4 LT |
2153 | |
2154 | if (write && *valp != val) | |
4ccfe6d4 | 2155 | rt_cache_flush(net); |
1da177e4 LT |
2156 | |
2157 | return ret; | |
2158 | } | |
2159 | ||
f8572d8f | 2160 | #define DEVINET_SYSCTL_ENTRY(attr, name, mval, proc) \ |
42f811b8 | 2161 | { \ |
42f811b8 HX |
2162 | .procname = name, \ |
2163 | .data = ipv4_devconf.data + \ | |
02291680 | 2164 | IPV4_DEVCONF_ ## attr - 1, \ |
42f811b8 HX |
2165 | .maxlen = sizeof(int), \ |
2166 | .mode = mval, \ | |
2167 | .proc_handler = proc, \ | |
31be3085 | 2168 | .extra1 = &ipv4_devconf, \ |
42f811b8 HX |
2169 | } |
2170 | ||
2171 | #define DEVINET_SYSCTL_RW_ENTRY(attr, name) \ | |
f8572d8f | 2172 | DEVINET_SYSCTL_ENTRY(attr, name, 0644, devinet_conf_proc) |
42f811b8 HX |
2173 | |
2174 | #define DEVINET_SYSCTL_RO_ENTRY(attr, name) \ | |
f8572d8f | 2175 | DEVINET_SYSCTL_ENTRY(attr, name, 0444, devinet_conf_proc) |
42f811b8 | 2176 | |
f8572d8f EB |
2177 | #define DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, proc) \ |
2178 | DEVINET_SYSCTL_ENTRY(attr, name, 0644, proc) | |
42f811b8 HX |
2179 | |
2180 | #define DEVINET_SYSCTL_FLUSHING_ENTRY(attr, name) \ | |
f8572d8f | 2181 | DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, ipv4_doint_and_flush) |
42f811b8 | 2182 | |
1da177e4 LT |
2183 | static struct devinet_sysctl_table { |
2184 | struct ctl_table_header *sysctl_header; | |
02291680 | 2185 | struct ctl_table devinet_vars[__IPV4_DEVCONF_MAX]; |
1da177e4 LT |
2186 | } devinet_sysctl = { |
2187 | .devinet_vars = { | |
42f811b8 | 2188 | DEVINET_SYSCTL_COMPLEX_ENTRY(FORWARDING, "forwarding", |
f8572d8f | 2189 | devinet_sysctl_forward), |
42f811b8 HX |
2190 | DEVINET_SYSCTL_RO_ENTRY(MC_FORWARDING, "mc_forwarding"), |
2191 | ||
2192 | DEVINET_SYSCTL_RW_ENTRY(ACCEPT_REDIRECTS, "accept_redirects"), | |
2193 | DEVINET_SYSCTL_RW_ENTRY(SECURE_REDIRECTS, "secure_redirects"), | |
2194 | DEVINET_SYSCTL_RW_ENTRY(SHARED_MEDIA, "shared_media"), | |
2195 | DEVINET_SYSCTL_RW_ENTRY(RP_FILTER, "rp_filter"), | |
2196 | DEVINET_SYSCTL_RW_ENTRY(SEND_REDIRECTS, "send_redirects"), | |
2197 | DEVINET_SYSCTL_RW_ENTRY(ACCEPT_SOURCE_ROUTE, | |
2198 | "accept_source_route"), | |
8153a10c | 2199 | DEVINET_SYSCTL_RW_ENTRY(ACCEPT_LOCAL, "accept_local"), |
28f6aeea | 2200 | DEVINET_SYSCTL_RW_ENTRY(SRC_VMARK, "src_valid_mark"), |
42f811b8 HX |
2201 | DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP, "proxy_arp"), |
2202 | DEVINET_SYSCTL_RW_ENTRY(MEDIUM_ID, "medium_id"), | |
2203 | DEVINET_SYSCTL_RW_ENTRY(BOOTP_RELAY, "bootp_relay"), | |
2204 | DEVINET_SYSCTL_RW_ENTRY(LOG_MARTIANS, "log_martians"), | |
2205 | DEVINET_SYSCTL_RW_ENTRY(TAG, "tag"), | |
2206 | DEVINET_SYSCTL_RW_ENTRY(ARPFILTER, "arp_filter"), | |
2207 | DEVINET_SYSCTL_RW_ENTRY(ARP_ANNOUNCE, "arp_announce"), | |
2208 | DEVINET_SYSCTL_RW_ENTRY(ARP_IGNORE, "arp_ignore"), | |
2209 | DEVINET_SYSCTL_RW_ENTRY(ARP_ACCEPT, "arp_accept"), | |
eefef1cf | 2210 | DEVINET_SYSCTL_RW_ENTRY(ARP_NOTIFY, "arp_notify"), |
65324144 | 2211 | DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP_PVLAN, "proxy_arp_pvlan"), |
5c6fe01c WM |
2212 | DEVINET_SYSCTL_RW_ENTRY(FORCE_IGMP_VERSION, |
2213 | "force_igmp_version"), | |
2690048c WM |
2214 | DEVINET_SYSCTL_RW_ENTRY(IGMPV2_UNSOLICITED_REPORT_INTERVAL, |
2215 | "igmpv2_unsolicited_report_interval"), | |
2216 | DEVINET_SYSCTL_RW_ENTRY(IGMPV3_UNSOLICITED_REPORT_INTERVAL, | |
2217 | "igmpv3_unsolicited_report_interval"), | |
0eeb075f AG |
2218 | DEVINET_SYSCTL_RW_ENTRY(IGNORE_ROUTES_WITH_LINKDOWN, |
2219 | "ignore_routes_with_linkdown"), | |
97daf331 JB |
2220 | DEVINET_SYSCTL_RW_ENTRY(DROP_GRATUITOUS_ARP, |
2221 | "drop_gratuitous_arp"), | |
42f811b8 HX |
2222 | |
2223 | DEVINET_SYSCTL_FLUSHING_ENTRY(NOXFRM, "disable_xfrm"), | |
2224 | DEVINET_SYSCTL_FLUSHING_ENTRY(NOPOLICY, "disable_policy"), | |
42f811b8 HX |
2225 | DEVINET_SYSCTL_FLUSHING_ENTRY(PROMOTE_SECONDARIES, |
2226 | "promote_secondaries"), | |
d0daebc3 TG |
2227 | DEVINET_SYSCTL_FLUSHING_ENTRY(ROUTE_LOCALNET, |
2228 | "route_localnet"), | |
12b74dfa JB |
2229 | DEVINET_SYSCTL_FLUSHING_ENTRY(DROP_UNICAST_IN_L2_MULTICAST, |
2230 | "drop_unicast_in_l2_multicast"), | |
1da177e4 | 2231 | }, |
1da177e4 LT |
2232 | }; |
2233 | ||
ea40b324 | 2234 | static int __devinet_sysctl_register(struct net *net, char *dev_name, |
f8572d8f | 2235 | struct ipv4_devconf *p) |
1da177e4 LT |
2236 | { |
2237 | int i; | |
9fa89642 | 2238 | struct devinet_sysctl_table *t; |
8607ddb8 | 2239 | char path[sizeof("net/ipv4/conf/") + IFNAMSIZ]; |
bfada697 | 2240 | |
9fa89642 | 2241 | t = kmemdup(&devinet_sysctl, sizeof(*t), GFP_KERNEL); |
1da177e4 | 2242 | if (!t) |
9fa89642 PE |
2243 | goto out; |
2244 | ||
1da177e4 LT |
2245 | for (i = 0; i < ARRAY_SIZE(t->devinet_vars) - 1; i++) { |
2246 | t->devinet_vars[i].data += (char *)p - (char *)&ipv4_devconf; | |
31be3085 | 2247 | t->devinet_vars[i].extra1 = p; |
c0ce9fb3 | 2248 | t->devinet_vars[i].extra2 = net; |
1da177e4 LT |
2249 | } |
2250 | ||
8607ddb8 | 2251 | snprintf(path, sizeof(path), "net/ipv4/conf/%s", dev_name); |
1da177e4 | 2252 | |
8607ddb8 | 2253 | t->sysctl_header = register_net_sysctl(net, path, t->devinet_vars); |
1da177e4 | 2254 | if (!t->sysctl_header) |
8607ddb8 | 2255 | goto free; |
1da177e4 LT |
2256 | |
2257 | p->sysctl = t; | |
ea40b324 | 2258 | return 0; |
1da177e4 | 2259 | |
9fa89642 | 2260 | free: |
1da177e4 | 2261 | kfree(t); |
9fa89642 | 2262 | out: |
ea40b324 | 2263 | return -ENOBUFS; |
1da177e4 LT |
2264 | } |
2265 | ||
51602b2a PE |
2266 | static void __devinet_sysctl_unregister(struct ipv4_devconf *cnf) |
2267 | { | |
2268 | struct devinet_sysctl_table *t = cnf->sysctl; | |
2269 | ||
51456b29 | 2270 | if (!t) |
51602b2a PE |
2271 | return; |
2272 | ||
2273 | cnf->sysctl = NULL; | |
ff538818 | 2274 | unregister_net_sysctl_table(t->sysctl_header); |
51602b2a PE |
2275 | kfree(t); |
2276 | } | |
2277 | ||
20e61da7 | 2278 | static int devinet_sysctl_register(struct in_device *idev) |
66f27a52 | 2279 | { |
20e61da7 WC |
2280 | int err; |
2281 | ||
2282 | if (!sysctl_dev_name_is_allowed(idev->dev->name)) | |
2283 | return -EINVAL; | |
2284 | ||
2285 | err = neigh_sysctl_register(idev->dev, idev->arp_parms, NULL); | |
2286 | if (err) | |
2287 | return err; | |
2288 | err = __devinet_sysctl_register(dev_net(idev->dev), idev->dev->name, | |
f8572d8f | 2289 | &idev->cnf); |
20e61da7 WC |
2290 | if (err) |
2291 | neigh_sysctl_unregister(idev->arp_parms); | |
2292 | return err; | |
66f27a52 PE |
2293 | } |
2294 | ||
51602b2a | 2295 | static void devinet_sysctl_unregister(struct in_device *idev) |
1da177e4 | 2296 | { |
51602b2a PE |
2297 | __devinet_sysctl_unregister(&idev->cnf); |
2298 | neigh_sysctl_unregister(idev->arp_parms); | |
1da177e4 | 2299 | } |
1da177e4 | 2300 | |
68dd299b PE |
2301 | static struct ctl_table ctl_forward_entry[] = { |
2302 | { | |
68dd299b PE |
2303 | .procname = "ip_forward", |
2304 | .data = &ipv4_devconf.data[ | |
02291680 | 2305 | IPV4_DEVCONF_FORWARDING - 1], |
68dd299b PE |
2306 | .maxlen = sizeof(int), |
2307 | .mode = 0644, | |
2308 | .proc_handler = devinet_sysctl_forward, | |
68dd299b | 2309 | .extra1 = &ipv4_devconf, |
c0ce9fb3 | 2310 | .extra2 = &init_net, |
68dd299b PE |
2311 | }, |
2312 | { }, | |
2313 | }; | |
2a75de0c | 2314 | #endif |
68dd299b | 2315 | |
752d14dc PE |
2316 | static __net_init int devinet_init_net(struct net *net) |
2317 | { | |
2318 | int err; | |
752d14dc | 2319 | struct ipv4_devconf *all, *dflt; |
2a75de0c ED |
2320 | #ifdef CONFIG_SYSCTL |
2321 | struct ctl_table *tbl = ctl_forward_entry; | |
752d14dc | 2322 | struct ctl_table_header *forw_hdr; |
2a75de0c | 2323 | #endif |
752d14dc PE |
2324 | |
2325 | err = -ENOMEM; | |
2326 | all = &ipv4_devconf; | |
2327 | dflt = &ipv4_devconf_dflt; | |
752d14dc | 2328 | |
09ad9bc7 | 2329 | if (!net_eq(net, &init_net)) { |
752d14dc | 2330 | all = kmemdup(all, sizeof(ipv4_devconf), GFP_KERNEL); |
51456b29 | 2331 | if (!all) |
752d14dc PE |
2332 | goto err_alloc_all; |
2333 | ||
2334 | dflt = kmemdup(dflt, sizeof(ipv4_devconf_dflt), GFP_KERNEL); | |
51456b29 | 2335 | if (!dflt) |
752d14dc PE |
2336 | goto err_alloc_dflt; |
2337 | ||
2a75de0c | 2338 | #ifdef CONFIG_SYSCTL |
752d14dc | 2339 | tbl = kmemdup(tbl, sizeof(ctl_forward_entry), GFP_KERNEL); |
51456b29 | 2340 | if (!tbl) |
752d14dc PE |
2341 | goto err_alloc_ctl; |
2342 | ||
02291680 | 2343 | tbl[0].data = &all->data[IPV4_DEVCONF_FORWARDING - 1]; |
752d14dc PE |
2344 | tbl[0].extra1 = all; |
2345 | tbl[0].extra2 = net; | |
2a75de0c | 2346 | #endif |
752d14dc PE |
2347 | } |
2348 | ||
2349 | #ifdef CONFIG_SYSCTL | |
f8572d8f | 2350 | err = __devinet_sysctl_register(net, "all", all); |
752d14dc PE |
2351 | if (err < 0) |
2352 | goto err_reg_all; | |
2353 | ||
f8572d8f | 2354 | err = __devinet_sysctl_register(net, "default", dflt); |
752d14dc PE |
2355 | if (err < 0) |
2356 | goto err_reg_dflt; | |
2357 | ||
2358 | err = -ENOMEM; | |
8607ddb8 | 2359 | forw_hdr = register_net_sysctl(net, "net/ipv4", tbl); |
51456b29 | 2360 | if (!forw_hdr) |
752d14dc | 2361 | goto err_reg_ctl; |
2a75de0c | 2362 | net->ipv4.forw_hdr = forw_hdr; |
752d14dc PE |
2363 | #endif |
2364 | ||
752d14dc PE |
2365 | net->ipv4.devconf_all = all; |
2366 | net->ipv4.devconf_dflt = dflt; | |
2367 | return 0; | |
2368 | ||
2369 | #ifdef CONFIG_SYSCTL | |
2370 | err_reg_ctl: | |
2371 | __devinet_sysctl_unregister(dflt); | |
2372 | err_reg_dflt: | |
2373 | __devinet_sysctl_unregister(all); | |
2374 | err_reg_all: | |
2375 | if (tbl != ctl_forward_entry) | |
2376 | kfree(tbl); | |
752d14dc | 2377 | err_alloc_ctl: |
2a75de0c | 2378 | #endif |
752d14dc PE |
2379 | if (dflt != &ipv4_devconf_dflt) |
2380 | kfree(dflt); | |
2381 | err_alloc_dflt: | |
2382 | if (all != &ipv4_devconf) | |
2383 | kfree(all); | |
2384 | err_alloc_all: | |
2385 | return err; | |
2386 | } | |
2387 | ||
2388 | static __net_exit void devinet_exit_net(struct net *net) | |
2389 | { | |
2a75de0c | 2390 | #ifdef CONFIG_SYSCTL |
752d14dc PE |
2391 | struct ctl_table *tbl; |
2392 | ||
2393 | tbl = net->ipv4.forw_hdr->ctl_table_arg; | |
752d14dc PE |
2394 | unregister_net_sysctl_table(net->ipv4.forw_hdr); |
2395 | __devinet_sysctl_unregister(net->ipv4.devconf_dflt); | |
2396 | __devinet_sysctl_unregister(net->ipv4.devconf_all); | |
752d14dc | 2397 | kfree(tbl); |
2a75de0c | 2398 | #endif |
752d14dc PE |
2399 | kfree(net->ipv4.devconf_dflt); |
2400 | kfree(net->ipv4.devconf_all); | |
2401 | } | |
2402 | ||
2403 | static __net_initdata struct pernet_operations devinet_ops = { | |
2404 | .init = devinet_init_net, | |
2405 | .exit = devinet_exit_net, | |
2406 | }; | |
2407 | ||
207895fd | 2408 | static struct rtnl_af_ops inet_af_ops __read_mostly = { |
9f0f7272 TG |
2409 | .family = AF_INET, |
2410 | .fill_link_af = inet_fill_link_af, | |
2411 | .get_link_af_size = inet_get_link_af_size, | |
cf7afbfe TG |
2412 | .validate_link_af = inet_validate_link_af, |
2413 | .set_link_af = inet_set_link_af, | |
9f0f7272 TG |
2414 | }; |
2415 | ||
1da177e4 LT |
2416 | void __init devinet_init(void) |
2417 | { | |
fd23c3b3 DM |
2418 | int i; |
2419 | ||
2420 | for (i = 0; i < IN4_ADDR_HSIZE; i++) | |
2421 | INIT_HLIST_HEAD(&inet_addr_lst[i]); | |
2422 | ||
752d14dc PE |
2423 | register_pernet_subsys(&devinet_ops); |
2424 | ||
1da177e4 LT |
2425 | register_gifconf(PF_INET, inet_gifconf); |
2426 | register_netdevice_notifier(&ip_netdev_notifier); | |
63f3444f | 2427 | |
906e073f | 2428 | queue_delayed_work(system_power_efficient_wq, &check_lifetime_work, 0); |
5c766d64 | 2429 | |
9f0f7272 TG |
2430 | rtnl_af_register(&inet_af_ops); |
2431 | ||
c7ac8679 GR |
2432 | rtnl_register(PF_INET, RTM_NEWADDR, inet_rtm_newaddr, NULL, NULL); |
2433 | rtnl_register(PF_INET, RTM_DELADDR, inet_rtm_deladdr, NULL, NULL); | |
2434 | rtnl_register(PF_INET, RTM_GETADDR, NULL, inet_dump_ifaddr, NULL); | |
9e551110 | 2435 | rtnl_register(PF_INET, RTM_GETNETCONF, inet_netconf_get_devconf, |
7a674200 | 2436 | inet_netconf_dump_devconf, NULL); |
1da177e4 | 2437 | } |