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 | 28 | |
7c0f6ba6 | 29 | #include <linux/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> | |
174cd4b1 | 35 | #include <linux/sched/signal.h> |
1da177e4 LT |
36 | #include <linux/string.h> |
37 | #include <linux/mm.h> | |
38 | #include <linux/socket.h> | |
39 | #include <linux/sockios.h> | |
40 | #include <linux/in.h> | |
41 | #include <linux/errno.h> | |
42 | #include <linux/interrupt.h> | |
1823730f | 43 | #include <linux/if_addr.h> |
1da177e4 LT |
44 | #include <linux/if_ether.h> |
45 | #include <linux/inet.h> | |
46 | #include <linux/netdevice.h> | |
47 | #include <linux/etherdevice.h> | |
48 | #include <linux/skbuff.h> | |
1da177e4 LT |
49 | #include <linux/init.h> |
50 | #include <linux/notifier.h> | |
51 | #include <linux/inetdevice.h> | |
52 | #include <linux/igmp.h> | |
5a0e3ad6 | 53 | #include <linux/slab.h> |
fd23c3b3 | 54 | #include <linux/hash.h> |
1da177e4 LT |
55 | #ifdef CONFIG_SYSCTL |
56 | #include <linux/sysctl.h> | |
57 | #endif | |
58 | #include <linux/kmod.h> | |
edc9e748 | 59 | #include <linux/netconf.h> |
1da177e4 | 60 | |
14c85021 | 61 | #include <net/arp.h> |
1da177e4 LT |
62 | #include <net/ip.h> |
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 | |
0027ba84 | 69 | static struct ipv4_devconf ipv4_devconf = { |
42f811b8 | 70 | .data = { |
02291680 EB |
71 | [IPV4_DEVCONF_ACCEPT_REDIRECTS - 1] = 1, |
72 | [IPV4_DEVCONF_SEND_REDIRECTS - 1] = 1, | |
73 | [IPV4_DEVCONF_SECURE_REDIRECTS - 1] = 1, | |
74 | [IPV4_DEVCONF_SHARED_MEDIA - 1] = 1, | |
2690048c WM |
75 | [IPV4_DEVCONF_IGMPV2_UNSOLICITED_REPORT_INTERVAL - 1] = 10000 /*ms*/, |
76 | [IPV4_DEVCONF_IGMPV3_UNSOLICITED_REPORT_INTERVAL - 1] = 1000 /*ms*/, | |
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, | |
2690048c WM |
87 | [IPV4_DEVCONF_IGMPV2_UNSOLICITED_REPORT_INTERVAL - 1] = 10000 /*ms*/, |
88 | [IPV4_DEVCONF_IGMPV3_UNSOLICITED_REPORT_INTERVAL - 1] = 1000 /*ms*/, | |
42f811b8 | 89 | }, |
1da177e4 LT |
90 | }; |
91 | ||
9355bbd6 PE |
92 | #define IPV4_DEVCONF_DFLT(net, attr) \ |
93 | IPV4_DEVCONF((*net->ipv4.devconf_dflt), attr) | |
42f811b8 | 94 | |
ef7c79ed | 95 | static const struct nla_policy ifa_ipv4_policy[IFA_MAX+1] = { |
5c753978 TG |
96 | [IFA_LOCAL] = { .type = NLA_U32 }, |
97 | [IFA_ADDRESS] = { .type = NLA_U32 }, | |
98 | [IFA_BROADCAST] = { .type = NLA_U32 }, | |
5176f91e | 99 | [IFA_LABEL] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, |
5c766d64 | 100 | [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, |
ad6c8135 | 101 | [IFA_FLAGS] = { .type = NLA_U32 }, |
5c753978 TG |
102 | }; |
103 | ||
40384999 ED |
104 | #define IN4_ADDR_HSIZE_SHIFT 8 |
105 | #define IN4_ADDR_HSIZE (1U << IN4_ADDR_HSIZE_SHIFT) | |
106 | ||
fd23c3b3 | 107 | static struct hlist_head inet_addr_lst[IN4_ADDR_HSIZE]; |
fd23c3b3 | 108 | |
6eada011 | 109 | static u32 inet_addr_hash(const struct net *net, __be32 addr) |
fd23c3b3 | 110 | { |
40384999 | 111 | u32 val = (__force u32) addr ^ net_hash_mix(net); |
fd23c3b3 | 112 | |
40384999 | 113 | return hash_32(val, IN4_ADDR_HSIZE_SHIFT); |
fd23c3b3 DM |
114 | } |
115 | ||
116 | static void inet_hash_insert(struct net *net, struct in_ifaddr *ifa) | |
117 | { | |
40384999 | 118 | u32 hash = inet_addr_hash(net, ifa->ifa_local); |
fd23c3b3 | 119 | |
32a4be48 | 120 | ASSERT_RTNL(); |
fd23c3b3 | 121 | hlist_add_head_rcu(&ifa->hash, &inet_addr_lst[hash]); |
fd23c3b3 DM |
122 | } |
123 | ||
124 | static void inet_hash_remove(struct in_ifaddr *ifa) | |
125 | { | |
32a4be48 | 126 | ASSERT_RTNL(); |
fd23c3b3 | 127 | hlist_del_init_rcu(&ifa->hash); |
fd23c3b3 DM |
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); |
3ad7d246 | 179 | static BLOCKING_NOTIFIER_HEAD(inetaddr_validator_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; | |
3ad7d246 KJ |
445 | struct in_validator_info ivi; |
446 | int ret; | |
1da177e4 LT |
447 | |
448 | ASSERT_RTNL(); | |
449 | ||
450 | if (!ifa->ifa_local) { | |
451 | inet_free_ifa(ifa); | |
452 | return 0; | |
453 | } | |
454 | ||
455 | ifa->ifa_flags &= ~IFA_F_SECONDARY; | |
456 | last_primary = &in_dev->ifa_list; | |
457 | ||
458 | for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL; | |
459 | ifap = &ifa1->ifa_next) { | |
460 | if (!(ifa1->ifa_flags & IFA_F_SECONDARY) && | |
461 | ifa->ifa_scope <= ifa1->ifa_scope) | |
462 | last_primary = &ifa1->ifa_next; | |
463 | if (ifa1->ifa_mask == ifa->ifa_mask && | |
464 | inet_ifa_match(ifa1->ifa_address, ifa)) { | |
465 | if (ifa1->ifa_local == ifa->ifa_local) { | |
466 | inet_free_ifa(ifa); | |
467 | return -EEXIST; | |
468 | } | |
469 | if (ifa1->ifa_scope != ifa->ifa_scope) { | |
470 | inet_free_ifa(ifa); | |
471 | return -EINVAL; | |
472 | } | |
473 | ifa->ifa_flags |= IFA_F_SECONDARY; | |
474 | } | |
475 | } | |
476 | ||
3ad7d246 KJ |
477 | /* Allow any devices that wish to register ifaddr validtors to weigh |
478 | * in now, before changes are committed. The rntl lock is serializing | |
479 | * access here, so the state should not change between a validator call | |
480 | * and a final notify on commit. This isn't invoked on promotion under | |
481 | * the assumption that validators are checking the address itself, and | |
482 | * not the flags. | |
483 | */ | |
484 | ivi.ivi_addr = ifa->ifa_address; | |
485 | ivi.ivi_dev = ifa->ifa_dev; | |
486 | ret = blocking_notifier_call_chain(&inetaddr_validator_chain, | |
487 | NETDEV_UP, &ivi); | |
488 | ret = notifier_to_errno(ret); | |
489 | if (ret) { | |
490 | inet_free_ifa(ifa); | |
491 | return ret; | |
492 | } | |
493 | ||
1da177e4 | 494 | if (!(ifa->ifa_flags & IFA_F_SECONDARY)) { |
63862b5b | 495 | prandom_seed((__force u32) ifa->ifa_local); |
1da177e4 LT |
496 | ifap = last_primary; |
497 | } | |
498 | ||
499 | ifa->ifa_next = *ifap; | |
500 | *ifap = ifa; | |
501 | ||
fd23c3b3 DM |
502 | inet_hash_insert(dev_net(in_dev->dev), ifa); |
503 | ||
5c766d64 | 504 | cancel_delayed_work(&check_lifetime_work); |
906e073f | 505 | queue_delayed_work(system_power_efficient_wq, &check_lifetime_work, 0); |
5c766d64 | 506 | |
1da177e4 LT |
507 | /* Send message first, then call notifier. |
508 | Notifier will trigger FIB update, so that | |
509 | listeners of netlink will know about new ifaddr */ | |
15e47304 | 510 | rtmsg_ifa(RTM_NEWADDR, ifa, nlh, portid); |
e041c683 | 511 | blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa); |
1da177e4 LT |
512 | |
513 | return 0; | |
514 | } | |
515 | ||
d6062cbb TG |
516 | static int inet_insert_ifa(struct in_ifaddr *ifa) |
517 | { | |
518 | return __inet_insert_ifa(ifa, NULL, 0); | |
519 | } | |
520 | ||
1da177e4 LT |
521 | static int inet_set_ifa(struct net_device *dev, struct in_ifaddr *ifa) |
522 | { | |
e5ed6399 | 523 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
1da177e4 LT |
524 | |
525 | ASSERT_RTNL(); | |
526 | ||
527 | if (!in_dev) { | |
71e27da9 HX |
528 | inet_free_ifa(ifa); |
529 | return -ENOBUFS; | |
1da177e4 | 530 | } |
71e27da9 | 531 | ipv4_devconf_setall(in_dev); |
1d4c8c29 | 532 | neigh_parms_data_state_setall(in_dev->arp_parms); |
1da177e4 | 533 | if (ifa->ifa_dev != in_dev) { |
547b792c | 534 | WARN_ON(ifa->ifa_dev); |
1da177e4 LT |
535 | in_dev_hold(in_dev); |
536 | ifa->ifa_dev = in_dev; | |
537 | } | |
f97c1e0c | 538 | if (ipv4_is_loopback(ifa->ifa_local)) |
1da177e4 LT |
539 | ifa->ifa_scope = RT_SCOPE_HOST; |
540 | return inet_insert_ifa(ifa); | |
541 | } | |
542 | ||
8723e1b4 ED |
543 | /* Caller must hold RCU or RTNL : |
544 | * We dont take a reference on found in_device | |
545 | */ | |
7fee0ca2 | 546 | struct in_device *inetdev_by_index(struct net *net, int ifindex) |
1da177e4 LT |
547 | { |
548 | struct net_device *dev; | |
549 | struct in_device *in_dev = NULL; | |
c148fc2e ED |
550 | |
551 | rcu_read_lock(); | |
552 | dev = dev_get_by_index_rcu(net, ifindex); | |
1da177e4 | 553 | if (dev) |
8723e1b4 | 554 | in_dev = rcu_dereference_rtnl(dev->ip_ptr); |
c148fc2e | 555 | rcu_read_unlock(); |
1da177e4 LT |
556 | return in_dev; |
557 | } | |
9f9354b9 | 558 | EXPORT_SYMBOL(inetdev_by_index); |
1da177e4 LT |
559 | |
560 | /* Called only from RTNL semaphored context. No locks. */ | |
561 | ||
60cad5da AV |
562 | struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix, |
563 | __be32 mask) | |
1da177e4 LT |
564 | { |
565 | ASSERT_RTNL(); | |
566 | ||
567 | for_primary_ifa(in_dev) { | |
568 | if (ifa->ifa_mask == mask && inet_ifa_match(prefix, ifa)) | |
569 | return ifa; | |
570 | } endfor_ifa(in_dev); | |
571 | return NULL; | |
572 | } | |
573 | ||
93a714d6 MC |
574 | static int ip_mc_config(struct sock *sk, bool join, const struct in_ifaddr *ifa) |
575 | { | |
576 | struct ip_mreqn mreq = { | |
577 | .imr_multiaddr.s_addr = ifa->ifa_address, | |
578 | .imr_ifindex = ifa->ifa_dev->dev->ifindex, | |
579 | }; | |
580 | int ret; | |
581 | ||
582 | ASSERT_RTNL(); | |
583 | ||
584 | lock_sock(sk); | |
585 | if (join) | |
54ff9ef3 | 586 | ret = ip_mc_join_group(sk, &mreq); |
93a714d6 | 587 | else |
54ff9ef3 | 588 | ret = ip_mc_leave_group(sk, &mreq); |
93a714d6 MC |
589 | release_sock(sk); |
590 | ||
591 | return ret; | |
592 | } | |
593 | ||
c21ef3e3 DA |
594 | static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, |
595 | struct netlink_ext_ack *extack) | |
1da177e4 | 596 | { |
3b1e0a65 | 597 | struct net *net = sock_net(skb->sk); |
dfdd5fd4 | 598 | struct nlattr *tb[IFA_MAX+1]; |
1da177e4 | 599 | struct in_device *in_dev; |
dfdd5fd4 | 600 | struct ifaddrmsg *ifm; |
1da177e4 | 601 | struct in_ifaddr *ifa, **ifap; |
dfdd5fd4 | 602 | int err = -EINVAL; |
1da177e4 LT |
603 | |
604 | ASSERT_RTNL(); | |
605 | ||
fceb6435 | 606 | err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy, |
c21ef3e3 | 607 | extack); |
dfdd5fd4 TG |
608 | if (err < 0) |
609 | goto errout; | |
610 | ||
611 | ifm = nlmsg_data(nlh); | |
7fee0ca2 | 612 | in_dev = inetdev_by_index(net, ifm->ifa_index); |
51456b29 | 613 | if (!in_dev) { |
dfdd5fd4 TG |
614 | err = -ENODEV; |
615 | goto errout; | |
616 | } | |
617 | ||
1da177e4 LT |
618 | for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; |
619 | ifap = &ifa->ifa_next) { | |
dfdd5fd4 | 620 | if (tb[IFA_LOCAL] && |
67b61f6c | 621 | ifa->ifa_local != nla_get_in_addr(tb[IFA_LOCAL])) |
dfdd5fd4 TG |
622 | continue; |
623 | ||
624 | if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label)) | |
1da177e4 | 625 | continue; |
dfdd5fd4 TG |
626 | |
627 | if (tb[IFA_ADDRESS] && | |
628 | (ifm->ifa_prefixlen != ifa->ifa_prefixlen || | |
67b61f6c | 629 | !inet_ifa_match(nla_get_in_addr(tb[IFA_ADDRESS]), ifa))) |
dfdd5fd4 TG |
630 | continue; |
631 | ||
93a714d6 MC |
632 | if (ipv4_is_multicast(ifa->ifa_address)) |
633 | ip_mc_config(net->ipv4.mc_autojoin_sk, false, ifa); | |
15e47304 | 634 | __inet_del_ifa(in_dev, ifap, 1, nlh, NETLINK_CB(skb).portid); |
1da177e4 LT |
635 | return 0; |
636 | } | |
dfdd5fd4 TG |
637 | |
638 | err = -EADDRNOTAVAIL; | |
639 | errout: | |
640 | return err; | |
1da177e4 LT |
641 | } |
642 | ||
5c766d64 JP |
643 | #define INFINITY_LIFE_TIME 0xFFFFFFFF |
644 | ||
645 | static void check_lifetime(struct work_struct *work) | |
646 | { | |
647 | unsigned long now, next, next_sec, next_sched; | |
648 | struct in_ifaddr *ifa; | |
c988d1e8 | 649 | struct hlist_node *n; |
5c766d64 JP |
650 | int i; |
651 | ||
652 | now = jiffies; | |
653 | next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); | |
654 | ||
5c766d64 | 655 | for (i = 0; i < IN4_ADDR_HSIZE; i++) { |
c988d1e8 JP |
656 | bool change_needed = false; |
657 | ||
658 | rcu_read_lock(); | |
b67bfe0d | 659 | hlist_for_each_entry_rcu(ifa, &inet_addr_lst[i], hash) { |
5c766d64 JP |
660 | unsigned long age; |
661 | ||
662 | if (ifa->ifa_flags & IFA_F_PERMANENT) | |
663 | continue; | |
664 | ||
665 | /* We try to batch several events at once. */ | |
666 | age = (now - ifa->ifa_tstamp + | |
667 | ADDRCONF_TIMER_FUZZ_MINUS) / HZ; | |
668 | ||
669 | if (ifa->ifa_valid_lft != INFINITY_LIFE_TIME && | |
670 | age >= ifa->ifa_valid_lft) { | |
c988d1e8 | 671 | change_needed = true; |
5c766d64 JP |
672 | } else if (ifa->ifa_preferred_lft == |
673 | INFINITY_LIFE_TIME) { | |
674 | continue; | |
675 | } else if (age >= ifa->ifa_preferred_lft) { | |
676 | if (time_before(ifa->ifa_tstamp + | |
677 | ifa->ifa_valid_lft * HZ, next)) | |
678 | next = ifa->ifa_tstamp + | |
679 | ifa->ifa_valid_lft * HZ; | |
680 | ||
c988d1e8 JP |
681 | if (!(ifa->ifa_flags & IFA_F_DEPRECATED)) |
682 | change_needed = true; | |
5c766d64 JP |
683 | } else if (time_before(ifa->ifa_tstamp + |
684 | ifa->ifa_preferred_lft * HZ, | |
685 | next)) { | |
686 | next = ifa->ifa_tstamp + | |
687 | ifa->ifa_preferred_lft * HZ; | |
688 | } | |
689 | } | |
c988d1e8 JP |
690 | rcu_read_unlock(); |
691 | if (!change_needed) | |
692 | continue; | |
693 | rtnl_lock(); | |
694 | hlist_for_each_entry_safe(ifa, n, &inet_addr_lst[i], hash) { | |
695 | unsigned long age; | |
696 | ||
697 | if (ifa->ifa_flags & IFA_F_PERMANENT) | |
698 | continue; | |
699 | ||
700 | /* We try to batch several events at once. */ | |
701 | age = (now - ifa->ifa_tstamp + | |
702 | ADDRCONF_TIMER_FUZZ_MINUS) / HZ; | |
703 | ||
704 | if (ifa->ifa_valid_lft != INFINITY_LIFE_TIME && | |
705 | age >= ifa->ifa_valid_lft) { | |
706 | struct in_ifaddr **ifap; | |
707 | ||
708 | for (ifap = &ifa->ifa_dev->ifa_list; | |
709 | *ifap != NULL; ifap = &(*ifap)->ifa_next) { | |
710 | if (*ifap == ifa) { | |
711 | inet_del_ifa(ifa->ifa_dev, | |
712 | ifap, 1); | |
713 | break; | |
714 | } | |
715 | } | |
716 | } else if (ifa->ifa_preferred_lft != | |
717 | INFINITY_LIFE_TIME && | |
718 | age >= ifa->ifa_preferred_lft && | |
719 | !(ifa->ifa_flags & IFA_F_DEPRECATED)) { | |
720 | ifa->ifa_flags |= IFA_F_DEPRECATED; | |
721 | rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0); | |
722 | } | |
723 | } | |
724 | rtnl_unlock(); | |
5c766d64 | 725 | } |
5c766d64 JP |
726 | |
727 | next_sec = round_jiffies_up(next); | |
728 | next_sched = next; | |
729 | ||
730 | /* If rounded timeout is accurate enough, accept it. */ | |
731 | if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) | |
732 | next_sched = next_sec; | |
733 | ||
734 | now = jiffies; | |
735 | /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ | |
736 | if (time_before(next_sched, now + ADDRCONF_TIMER_FUZZ_MAX)) | |
737 | next_sched = now + ADDRCONF_TIMER_FUZZ_MAX; | |
738 | ||
906e073f | 739 | queue_delayed_work(system_power_efficient_wq, &check_lifetime_work, |
740 | next_sched - now); | |
5c766d64 JP |
741 | } |
742 | ||
743 | static void set_ifa_lifetime(struct in_ifaddr *ifa, __u32 valid_lft, | |
744 | __u32 prefered_lft) | |
745 | { | |
746 | unsigned long timeout; | |
747 | ||
748 | ifa->ifa_flags &= ~(IFA_F_PERMANENT | IFA_F_DEPRECATED); | |
749 | ||
750 | timeout = addrconf_timeout_fixup(valid_lft, HZ); | |
751 | if (addrconf_finite_timeout(timeout)) | |
752 | ifa->ifa_valid_lft = timeout; | |
753 | else | |
754 | ifa->ifa_flags |= IFA_F_PERMANENT; | |
755 | ||
756 | timeout = addrconf_timeout_fixup(prefered_lft, HZ); | |
757 | if (addrconf_finite_timeout(timeout)) { | |
758 | if (timeout == 0) | |
759 | ifa->ifa_flags |= IFA_F_DEPRECATED; | |
760 | ifa->ifa_preferred_lft = timeout; | |
761 | } | |
762 | ifa->ifa_tstamp = jiffies; | |
763 | if (!ifa->ifa_cstamp) | |
764 | ifa->ifa_cstamp = ifa->ifa_tstamp; | |
765 | } | |
766 | ||
767 | static struct in_ifaddr *rtm_to_ifaddr(struct net *net, struct nlmsghdr *nlh, | |
768 | __u32 *pvalid_lft, __u32 *pprefered_lft) | |
1da177e4 | 769 | { |
5c753978 TG |
770 | struct nlattr *tb[IFA_MAX+1]; |
771 | struct in_ifaddr *ifa; | |
772 | struct ifaddrmsg *ifm; | |
1da177e4 LT |
773 | struct net_device *dev; |
774 | struct in_device *in_dev; | |
7b218574 | 775 | int err; |
1da177e4 | 776 | |
fceb6435 JB |
777 | err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy, |
778 | NULL); | |
5c753978 TG |
779 | if (err < 0) |
780 | goto errout; | |
1da177e4 | 781 | |
5c753978 | 782 | ifm = nlmsg_data(nlh); |
7b218574 | 783 | err = -EINVAL; |
51456b29 | 784 | if (ifm->ifa_prefixlen > 32 || !tb[IFA_LOCAL]) |
5c753978 | 785 | goto errout; |
1da177e4 | 786 | |
4b8aa9ab | 787 | dev = __dev_get_by_index(net, ifm->ifa_index); |
7b218574 | 788 | err = -ENODEV; |
51456b29 | 789 | if (!dev) |
5c753978 | 790 | goto errout; |
1da177e4 | 791 | |
5c753978 | 792 | in_dev = __in_dev_get_rtnl(dev); |
7b218574 | 793 | err = -ENOBUFS; |
51456b29 | 794 | if (!in_dev) |
71e27da9 | 795 | goto errout; |
1da177e4 | 796 | |
5c753978 | 797 | ifa = inet_alloc_ifa(); |
51456b29 | 798 | if (!ifa) |
5c753978 TG |
799 | /* |
800 | * A potential indev allocation can be left alive, it stays | |
801 | * assigned to its device and is destroy with it. | |
802 | */ | |
5c753978 | 803 | goto errout; |
5c753978 | 804 | |
a4e65d36 | 805 | ipv4_devconf_setall(in_dev); |
1d4c8c29 | 806 | neigh_parms_data_state_setall(in_dev->arp_parms); |
5c753978 TG |
807 | in_dev_hold(in_dev); |
808 | ||
51456b29 | 809 | if (!tb[IFA_ADDRESS]) |
5c753978 | 810 | tb[IFA_ADDRESS] = tb[IFA_LOCAL]; |
1da177e4 | 811 | |
fd23c3b3 | 812 | INIT_HLIST_NODE(&ifa->hash); |
1da177e4 LT |
813 | ifa->ifa_prefixlen = ifm->ifa_prefixlen; |
814 | ifa->ifa_mask = inet_make_mask(ifm->ifa_prefixlen); | |
ad6c8135 JP |
815 | ifa->ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : |
816 | ifm->ifa_flags; | |
1da177e4 | 817 | ifa->ifa_scope = ifm->ifa_scope; |
5c753978 TG |
818 | ifa->ifa_dev = in_dev; |
819 | ||
67b61f6c JB |
820 | ifa->ifa_local = nla_get_in_addr(tb[IFA_LOCAL]); |
821 | ifa->ifa_address = nla_get_in_addr(tb[IFA_ADDRESS]); | |
5c753978 TG |
822 | |
823 | if (tb[IFA_BROADCAST]) | |
67b61f6c | 824 | ifa->ifa_broadcast = nla_get_in_addr(tb[IFA_BROADCAST]); |
5c753978 | 825 | |
5c753978 TG |
826 | if (tb[IFA_LABEL]) |
827 | nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ); | |
1da177e4 LT |
828 | else |
829 | memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); | |
830 | ||
5c766d64 JP |
831 | if (tb[IFA_CACHEINFO]) { |
832 | struct ifa_cacheinfo *ci; | |
833 | ||
834 | ci = nla_data(tb[IFA_CACHEINFO]); | |
835 | if (!ci->ifa_valid || ci->ifa_prefered > ci->ifa_valid) { | |
836 | err = -EINVAL; | |
446266b0 | 837 | goto errout_free; |
5c766d64 JP |
838 | } |
839 | *pvalid_lft = ci->ifa_valid; | |
840 | *pprefered_lft = ci->ifa_prefered; | |
841 | } | |
842 | ||
5c753978 TG |
843 | return ifa; |
844 | ||
446266b0 DB |
845 | errout_free: |
846 | inet_free_ifa(ifa); | |
5c753978 TG |
847 | errout: |
848 | return ERR_PTR(err); | |
849 | } | |
850 | ||
5c766d64 JP |
851 | static struct in_ifaddr *find_matching_ifa(struct in_ifaddr *ifa) |
852 | { | |
853 | struct in_device *in_dev = ifa->ifa_dev; | |
854 | struct in_ifaddr *ifa1, **ifap; | |
855 | ||
856 | if (!ifa->ifa_local) | |
857 | return NULL; | |
858 | ||
859 | for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL; | |
860 | ifap = &ifa1->ifa_next) { | |
861 | if (ifa1->ifa_mask == ifa->ifa_mask && | |
862 | inet_ifa_match(ifa1->ifa_address, ifa) && | |
863 | ifa1->ifa_local == ifa->ifa_local) | |
864 | return ifa1; | |
865 | } | |
866 | return NULL; | |
867 | } | |
868 | ||
c21ef3e3 DA |
869 | static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, |
870 | struct netlink_ext_ack *extack) | |
5c753978 | 871 | { |
3b1e0a65 | 872 | struct net *net = sock_net(skb->sk); |
5c753978 | 873 | struct in_ifaddr *ifa; |
5c766d64 JP |
874 | struct in_ifaddr *ifa_existing; |
875 | __u32 valid_lft = INFINITY_LIFE_TIME; | |
876 | __u32 prefered_lft = INFINITY_LIFE_TIME; | |
5c753978 TG |
877 | |
878 | ASSERT_RTNL(); | |
879 | ||
5c766d64 | 880 | ifa = rtm_to_ifaddr(net, nlh, &valid_lft, &prefered_lft); |
5c753978 TG |
881 | if (IS_ERR(ifa)) |
882 | return PTR_ERR(ifa); | |
883 | ||
5c766d64 JP |
884 | ifa_existing = find_matching_ifa(ifa); |
885 | if (!ifa_existing) { | |
886 | /* It would be best to check for !NLM_F_CREATE here but | |
614d056c | 887 | * userspace already relies on not having to provide this. |
5c766d64 JP |
888 | */ |
889 | set_ifa_lifetime(ifa, valid_lft, prefered_lft); | |
93a714d6 MC |
890 | if (ifa->ifa_flags & IFA_F_MCAUTOJOIN) { |
891 | int ret = ip_mc_config(net->ipv4.mc_autojoin_sk, | |
892 | true, ifa); | |
893 | ||
894 | if (ret < 0) { | |
895 | inet_free_ifa(ifa); | |
896 | return ret; | |
897 | } | |
898 | } | |
5c766d64 JP |
899 | return __inet_insert_ifa(ifa, nlh, NETLINK_CB(skb).portid); |
900 | } else { | |
901 | inet_free_ifa(ifa); | |
902 | ||
903 | if (nlh->nlmsg_flags & NLM_F_EXCL || | |
904 | !(nlh->nlmsg_flags & NLM_F_REPLACE)) | |
905 | return -EEXIST; | |
34e2ed34 JP |
906 | ifa = ifa_existing; |
907 | set_ifa_lifetime(ifa, valid_lft, prefered_lft); | |
05a324b9 | 908 | cancel_delayed_work(&check_lifetime_work); |
906e073f | 909 | queue_delayed_work(system_power_efficient_wq, |
910 | &check_lifetime_work, 0); | |
34e2ed34 | 911 | rtmsg_ifa(RTM_NEWADDR, ifa, nlh, NETLINK_CB(skb).portid); |
5c766d64 JP |
912 | } |
913 | return 0; | |
1da177e4 LT |
914 | } |
915 | ||
916 | /* | |
917 | * Determine a default network mask, based on the IP address. | |
918 | */ | |
919 | ||
40384999 | 920 | static int inet_abc_len(__be32 addr) |
1da177e4 LT |
921 | { |
922 | int rc = -1; /* Something else, probably a multicast. */ | |
923 | ||
f97c1e0c | 924 | if (ipv4_is_zeronet(addr)) |
e905a9ed | 925 | rc = 0; |
1da177e4 | 926 | else { |
714e85be | 927 | __u32 haddr = ntohl(addr); |
1da177e4 | 928 | |
714e85be | 929 | if (IN_CLASSA(haddr)) |
1da177e4 | 930 | rc = 8; |
714e85be | 931 | else if (IN_CLASSB(haddr)) |
1da177e4 | 932 | rc = 16; |
714e85be | 933 | else if (IN_CLASSC(haddr)) |
1da177e4 LT |
934 | rc = 24; |
935 | } | |
936 | ||
e905a9ed | 937 | return rc; |
1da177e4 LT |
938 | } |
939 | ||
940 | ||
e5b13cb1 | 941 | int devinet_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
1da177e4 LT |
942 | { |
943 | struct ifreq ifr; | |
944 | struct sockaddr_in sin_orig; | |
945 | struct sockaddr_in *sin = (struct sockaddr_in *)&ifr.ifr_addr; | |
946 | struct in_device *in_dev; | |
947 | struct in_ifaddr **ifap = NULL; | |
948 | struct in_ifaddr *ifa = NULL; | |
949 | struct net_device *dev; | |
950 | char *colon; | |
951 | int ret = -EFAULT; | |
952 | int tryaddrmatch = 0; | |
953 | ||
954 | /* | |
955 | * Fetch the caller's info block into kernel space | |
956 | */ | |
957 | ||
958 | if (copy_from_user(&ifr, arg, sizeof(struct ifreq))) | |
959 | goto out; | |
960 | ifr.ifr_name[IFNAMSIZ - 1] = 0; | |
961 | ||
962 | /* save original address for comparison */ | |
963 | memcpy(&sin_orig, sin, sizeof(*sin)); | |
964 | ||
965 | colon = strchr(ifr.ifr_name, ':'); | |
966 | if (colon) | |
967 | *colon = 0; | |
968 | ||
e5b13cb1 | 969 | dev_load(net, ifr.ifr_name); |
1da177e4 | 970 | |
132adf54 | 971 | switch (cmd) { |
1da177e4 LT |
972 | case SIOCGIFADDR: /* Get interface address */ |
973 | case SIOCGIFBRDADDR: /* Get the broadcast address */ | |
974 | case SIOCGIFDSTADDR: /* Get the destination address */ | |
975 | case SIOCGIFNETMASK: /* Get the netmask for the interface */ | |
976 | /* Note that these ioctls will not sleep, | |
977 | so that we do not impose a lock. | |
978 | One day we will be forced to put shlock here (I mean SMP) | |
979 | */ | |
980 | tryaddrmatch = (sin_orig.sin_family == AF_INET); | |
981 | memset(sin, 0, sizeof(*sin)); | |
982 | sin->sin_family = AF_INET; | |
983 | break; | |
984 | ||
985 | case SIOCSIFFLAGS: | |
bf5b30b8 | 986 | ret = -EPERM; |
52e804c6 | 987 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
988 | goto out; |
989 | break; | |
990 | case SIOCSIFADDR: /* Set interface address (and family) */ | |
991 | case SIOCSIFBRDADDR: /* Set the broadcast address */ | |
992 | case SIOCSIFDSTADDR: /* Set the destination address */ | |
993 | case SIOCSIFNETMASK: /* Set the netmask for the interface */ | |
bf5b30b8 | 994 | ret = -EPERM; |
52e804c6 | 995 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
996 | goto out; |
997 | ret = -EINVAL; | |
998 | if (sin->sin_family != AF_INET) | |
999 | goto out; | |
1000 | break; | |
1001 | default: | |
1002 | ret = -EINVAL; | |
1003 | goto out; | |
1004 | } | |
1005 | ||
1006 | rtnl_lock(); | |
1007 | ||
1008 | ret = -ENODEV; | |
9f9354b9 ED |
1009 | dev = __dev_get_by_name(net, ifr.ifr_name); |
1010 | if (!dev) | |
1da177e4 LT |
1011 | goto done; |
1012 | ||
1013 | if (colon) | |
1014 | *colon = ':'; | |
1015 | ||
9f9354b9 ED |
1016 | in_dev = __in_dev_get_rtnl(dev); |
1017 | if (in_dev) { | |
1da177e4 LT |
1018 | if (tryaddrmatch) { |
1019 | /* Matthias Andree */ | |
1020 | /* compare label and address (4.4BSD style) */ | |
1021 | /* note: we only do this for a limited set of ioctls | |
1022 | and only if the original address family was AF_INET. | |
1023 | This is checked above. */ | |
1024 | for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; | |
1025 | ifap = &ifa->ifa_next) { | |
1026 | if (!strcmp(ifr.ifr_name, ifa->ifa_label) && | |
1027 | sin_orig.sin_addr.s_addr == | |
6c91afe1 | 1028 | ifa->ifa_local) { |
1da177e4 LT |
1029 | break; /* found */ |
1030 | } | |
1031 | } | |
1032 | } | |
1033 | /* we didn't get a match, maybe the application is | |
1034 | 4.3BSD-style and passed in junk so we fall back to | |
1035 | comparing just the label */ | |
1036 | if (!ifa) { | |
1037 | for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; | |
1038 | ifap = &ifa->ifa_next) | |
1039 | if (!strcmp(ifr.ifr_name, ifa->ifa_label)) | |
1040 | break; | |
1041 | } | |
1042 | } | |
1043 | ||
1044 | ret = -EADDRNOTAVAIL; | |
1045 | if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS) | |
1046 | goto done; | |
1047 | ||
132adf54 | 1048 | switch (cmd) { |
1da177e4 LT |
1049 | case SIOCGIFADDR: /* Get interface address */ |
1050 | sin->sin_addr.s_addr = ifa->ifa_local; | |
1051 | goto rarok; | |
1052 | ||
1053 | case SIOCGIFBRDADDR: /* Get the broadcast address */ | |
1054 | sin->sin_addr.s_addr = ifa->ifa_broadcast; | |
1055 | goto rarok; | |
1056 | ||
1057 | case SIOCGIFDSTADDR: /* Get the destination address */ | |
1058 | sin->sin_addr.s_addr = ifa->ifa_address; | |
1059 | goto rarok; | |
1060 | ||
1061 | case SIOCGIFNETMASK: /* Get the netmask for the interface */ | |
1062 | sin->sin_addr.s_addr = ifa->ifa_mask; | |
1063 | goto rarok; | |
1064 | ||
1065 | case SIOCSIFFLAGS: | |
1066 | if (colon) { | |
1067 | ret = -EADDRNOTAVAIL; | |
1068 | if (!ifa) | |
1069 | break; | |
1070 | ret = 0; | |
1071 | if (!(ifr.ifr_flags & IFF_UP)) | |
1072 | inet_del_ifa(in_dev, ifap, 1); | |
1073 | break; | |
1074 | } | |
1075 | ret = dev_change_flags(dev, ifr.ifr_flags); | |
1076 | break; | |
1077 | ||
1078 | case SIOCSIFADDR: /* Set interface address (and family) */ | |
1079 | ret = -EINVAL; | |
1080 | if (inet_abc_len(sin->sin_addr.s_addr) < 0) | |
1081 | break; | |
1082 | ||
1083 | if (!ifa) { | |
1084 | ret = -ENOBUFS; | |
9f9354b9 ED |
1085 | ifa = inet_alloc_ifa(); |
1086 | if (!ifa) | |
1da177e4 | 1087 | break; |
c7e2e1d7 | 1088 | INIT_HLIST_NODE(&ifa->hash); |
1da177e4 LT |
1089 | if (colon) |
1090 | memcpy(ifa->ifa_label, ifr.ifr_name, IFNAMSIZ); | |
1091 | else | |
1092 | memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); | |
1093 | } else { | |
1094 | ret = 0; | |
1095 | if (ifa->ifa_local == sin->sin_addr.s_addr) | |
1096 | break; | |
1097 | inet_del_ifa(in_dev, ifap, 0); | |
1098 | ifa->ifa_broadcast = 0; | |
148f9729 | 1099 | ifa->ifa_scope = 0; |
1da177e4 LT |
1100 | } |
1101 | ||
1102 | ifa->ifa_address = ifa->ifa_local = sin->sin_addr.s_addr; | |
1103 | ||
1104 | if (!(dev->flags & IFF_POINTOPOINT)) { | |
1105 | ifa->ifa_prefixlen = inet_abc_len(ifa->ifa_address); | |
1106 | ifa->ifa_mask = inet_make_mask(ifa->ifa_prefixlen); | |
1107 | if ((dev->flags & IFF_BROADCAST) && | |
1108 | ifa->ifa_prefixlen < 31) | |
1109 | ifa->ifa_broadcast = ifa->ifa_address | | |
1110 | ~ifa->ifa_mask; | |
1111 | } else { | |
1112 | ifa->ifa_prefixlen = 32; | |
1113 | ifa->ifa_mask = inet_make_mask(32); | |
1114 | } | |
5c766d64 | 1115 | set_ifa_lifetime(ifa, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); |
1da177e4 LT |
1116 | ret = inet_set_ifa(dev, ifa); |
1117 | break; | |
1118 | ||
1119 | case SIOCSIFBRDADDR: /* Set the broadcast address */ | |
1120 | ret = 0; | |
1121 | if (ifa->ifa_broadcast != sin->sin_addr.s_addr) { | |
1122 | inet_del_ifa(in_dev, ifap, 0); | |
1123 | ifa->ifa_broadcast = sin->sin_addr.s_addr; | |
1124 | inet_insert_ifa(ifa); | |
1125 | } | |
1126 | break; | |
1127 | ||
1128 | case SIOCSIFDSTADDR: /* Set the destination address */ | |
1129 | ret = 0; | |
1130 | if (ifa->ifa_address == sin->sin_addr.s_addr) | |
1131 | break; | |
1132 | ret = -EINVAL; | |
1133 | if (inet_abc_len(sin->sin_addr.s_addr) < 0) | |
1134 | break; | |
1135 | ret = 0; | |
1136 | inet_del_ifa(in_dev, ifap, 0); | |
1137 | ifa->ifa_address = sin->sin_addr.s_addr; | |
1138 | inet_insert_ifa(ifa); | |
1139 | break; | |
1140 | ||
1141 | case SIOCSIFNETMASK: /* Set the netmask for the interface */ | |
1142 | ||
1143 | /* | |
1144 | * The mask we set must be legal. | |
1145 | */ | |
1146 | ret = -EINVAL; | |
1147 | if (bad_mask(sin->sin_addr.s_addr, 0)) | |
1148 | break; | |
1149 | ret = 0; | |
1150 | if (ifa->ifa_mask != sin->sin_addr.s_addr) { | |
a144ea4b | 1151 | __be32 old_mask = ifa->ifa_mask; |
1da177e4 LT |
1152 | inet_del_ifa(in_dev, ifap, 0); |
1153 | ifa->ifa_mask = sin->sin_addr.s_addr; | |
1154 | ifa->ifa_prefixlen = inet_mask_len(ifa->ifa_mask); | |
1155 | ||
1156 | /* See if current broadcast address matches | |
1157 | * with current netmask, then recalculate | |
1158 | * the broadcast address. Otherwise it's a | |
1159 | * funny address, so don't touch it since | |
1160 | * the user seems to know what (s)he's doing... | |
1161 | */ | |
1162 | if ((dev->flags & IFF_BROADCAST) && | |
1163 | (ifa->ifa_prefixlen < 31) && | |
1164 | (ifa->ifa_broadcast == | |
dcab5e1e | 1165 | (ifa->ifa_local|~old_mask))) { |
1da177e4 LT |
1166 | ifa->ifa_broadcast = (ifa->ifa_local | |
1167 | ~sin->sin_addr.s_addr); | |
1168 | } | |
1169 | inet_insert_ifa(ifa); | |
1170 | } | |
1171 | break; | |
1172 | } | |
1173 | done: | |
1174 | rtnl_unlock(); | |
1175 | out: | |
1176 | return ret; | |
1177 | rarok: | |
1178 | rtnl_unlock(); | |
1179 | ret = copy_to_user(arg, &ifr, sizeof(struct ifreq)) ? -EFAULT : 0; | |
1180 | goto out; | |
1181 | } | |
1182 | ||
1183 | static int inet_gifconf(struct net_device *dev, char __user *buf, int len) | |
1184 | { | |
e5ed6399 | 1185 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
1da177e4 LT |
1186 | struct in_ifaddr *ifa; |
1187 | struct ifreq ifr; | |
1188 | int done = 0; | |
1189 | ||
9f9354b9 | 1190 | if (!in_dev) |
1da177e4 LT |
1191 | goto out; |
1192 | ||
9f9354b9 | 1193 | for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { |
1da177e4 LT |
1194 | if (!buf) { |
1195 | done += sizeof(ifr); | |
1196 | continue; | |
1197 | } | |
1198 | if (len < (int) sizeof(ifr)) | |
1199 | break; | |
1200 | memset(&ifr, 0, sizeof(struct ifreq)); | |
4299c8a9 | 1201 | strcpy(ifr.ifr_name, ifa->ifa_label); |
1da177e4 LT |
1202 | |
1203 | (*(struct sockaddr_in *)&ifr.ifr_addr).sin_family = AF_INET; | |
1204 | (*(struct sockaddr_in *)&ifr.ifr_addr).sin_addr.s_addr = | |
1205 | ifa->ifa_local; | |
1206 | ||
1207 | if (copy_to_user(buf, &ifr, sizeof(struct ifreq))) { | |
1208 | done = -EFAULT; | |
1209 | break; | |
1210 | } | |
1211 | buf += sizeof(struct ifreq); | |
1212 | len -= sizeof(struct ifreq); | |
1213 | done += sizeof(struct ifreq); | |
1214 | } | |
1215 | out: | |
1216 | return done; | |
1217 | } | |
1218 | ||
8b57fd1e GF |
1219 | static __be32 in_dev_select_addr(const struct in_device *in_dev, |
1220 | int scope) | |
1221 | { | |
1222 | for_primary_ifa(in_dev) { | |
1223 | if (ifa->ifa_scope != RT_SCOPE_LINK && | |
1224 | ifa->ifa_scope <= scope) | |
1225 | return ifa->ifa_local; | |
1226 | } endfor_ifa(in_dev); | |
1227 | ||
1228 | return 0; | |
1229 | } | |
1230 | ||
a61ced5d | 1231 | __be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope) |
1da177e4 | 1232 | { |
a61ced5d | 1233 | __be32 addr = 0; |
1da177e4 | 1234 | struct in_device *in_dev; |
c346dca1 | 1235 | struct net *net = dev_net(dev); |
3f2fb9a8 | 1236 | int master_idx; |
1da177e4 LT |
1237 | |
1238 | rcu_read_lock(); | |
e5ed6399 | 1239 | in_dev = __in_dev_get_rcu(dev); |
1da177e4 LT |
1240 | if (!in_dev) |
1241 | goto no_in_dev; | |
1242 | ||
1243 | for_primary_ifa(in_dev) { | |
1244 | if (ifa->ifa_scope > scope) | |
1245 | continue; | |
1246 | if (!dst || inet_ifa_match(dst, ifa)) { | |
1247 | addr = ifa->ifa_local; | |
1248 | break; | |
1249 | } | |
1250 | if (!addr) | |
1251 | addr = ifa->ifa_local; | |
1252 | } endfor_ifa(in_dev); | |
1da177e4 LT |
1253 | |
1254 | if (addr) | |
c6d14c84 | 1255 | goto out_unlock; |
9f9354b9 | 1256 | no_in_dev: |
3f2fb9a8 | 1257 | master_idx = l3mdev_master_ifindex_rcu(dev); |
1da177e4 | 1258 | |
17b693cd DL |
1259 | /* For VRFs, the VRF device takes the place of the loopback device, |
1260 | * with addresses on it being preferred. Note in such cases the | |
1261 | * loopback device will be among the devices that fail the master_idx | |
1262 | * equality check in the loop below. | |
1263 | */ | |
1264 | if (master_idx && | |
1265 | (dev = dev_get_by_index_rcu(net, master_idx)) && | |
1266 | (in_dev = __in_dev_get_rcu(dev))) { | |
8b57fd1e GF |
1267 | addr = in_dev_select_addr(in_dev, scope); |
1268 | if (addr) | |
1269 | goto out_unlock; | |
17b693cd DL |
1270 | } |
1271 | ||
1da177e4 | 1272 | /* Not loopback addresses on loopback should be preferred |
ca9f1fd2 | 1273 | in this case. It is important that lo is the first interface |
1da177e4 LT |
1274 | in dev_base list. |
1275 | */ | |
c6d14c84 | 1276 | for_each_netdev_rcu(net, dev) { |
3f2fb9a8 DA |
1277 | if (l3mdev_master_ifindex_rcu(dev) != master_idx) |
1278 | continue; | |
1279 | ||
9f9354b9 ED |
1280 | in_dev = __in_dev_get_rcu(dev); |
1281 | if (!in_dev) | |
1da177e4 LT |
1282 | continue; |
1283 | ||
8b57fd1e GF |
1284 | addr = in_dev_select_addr(in_dev, scope); |
1285 | if (addr) | |
1286 | goto out_unlock; | |
1da177e4 | 1287 | } |
c6d14c84 | 1288 | out_unlock: |
1da177e4 | 1289 | rcu_read_unlock(); |
1da177e4 LT |
1290 | return addr; |
1291 | } | |
9f9354b9 | 1292 | EXPORT_SYMBOL(inet_select_addr); |
1da177e4 | 1293 | |
60cad5da AV |
1294 | static __be32 confirm_addr_indev(struct in_device *in_dev, __be32 dst, |
1295 | __be32 local, int scope) | |
1da177e4 LT |
1296 | { |
1297 | int same = 0; | |
a144ea4b | 1298 | __be32 addr = 0; |
1da177e4 LT |
1299 | |
1300 | for_ifa(in_dev) { | |
1301 | if (!addr && | |
1302 | (local == ifa->ifa_local || !local) && | |
1303 | ifa->ifa_scope <= scope) { | |
1304 | addr = ifa->ifa_local; | |
1305 | if (same) | |
1306 | break; | |
1307 | } | |
1308 | if (!same) { | |
1309 | same = (!local || inet_ifa_match(local, ifa)) && | |
1310 | (!dst || inet_ifa_match(dst, ifa)); | |
1311 | if (same && addr) { | |
1312 | if (local || !dst) | |
1313 | break; | |
1314 | /* Is the selected addr into dst subnet? */ | |
1315 | if (inet_ifa_match(addr, ifa)) | |
1316 | break; | |
1317 | /* No, then can we use new local src? */ | |
1318 | if (ifa->ifa_scope <= scope) { | |
1319 | addr = ifa->ifa_local; | |
1320 | break; | |
1321 | } | |
1322 | /* search for large dst subnet for addr */ | |
1323 | same = 0; | |
1324 | } | |
1325 | } | |
1326 | } endfor_ifa(in_dev); | |
1327 | ||
9f9354b9 | 1328 | return same ? addr : 0; |
1da177e4 LT |
1329 | } |
1330 | ||
1331 | /* | |
1332 | * Confirm that local IP address exists using wildcards: | |
b601fa19 ND |
1333 | * - net: netns to check, cannot be NULL |
1334 | * - in_dev: only on this interface, NULL=any interface | |
1da177e4 LT |
1335 | * - dst: only in the same subnet as dst, 0=any dst |
1336 | * - local: address, 0=autoselect the local address | |
1337 | * - scope: maximum allowed scope value for the local address | |
1338 | */ | |
b601fa19 | 1339 | __be32 inet_confirm_addr(struct net *net, struct in_device *in_dev, |
9bd85e32 | 1340 | __be32 dst, __be32 local, int scope) |
1da177e4 | 1341 | { |
60cad5da | 1342 | __be32 addr = 0; |
9bd85e32 | 1343 | struct net_device *dev; |
1da177e4 | 1344 | |
00db4124 | 1345 | if (in_dev) |
9bd85e32 | 1346 | return confirm_addr_indev(in_dev, dst, local, scope); |
1da177e4 | 1347 | |
1da177e4 | 1348 | rcu_read_lock(); |
c6d14c84 | 1349 | for_each_netdev_rcu(net, dev) { |
9f9354b9 ED |
1350 | in_dev = __in_dev_get_rcu(dev); |
1351 | if (in_dev) { | |
1da177e4 LT |
1352 | addr = confirm_addr_indev(in_dev, dst, local, scope); |
1353 | if (addr) | |
1354 | break; | |
1355 | } | |
1356 | } | |
1357 | rcu_read_unlock(); | |
1da177e4 LT |
1358 | |
1359 | return addr; | |
1360 | } | |
eaddcd76 | 1361 | EXPORT_SYMBOL(inet_confirm_addr); |
1da177e4 LT |
1362 | |
1363 | /* | |
1364 | * Device notifier | |
1365 | */ | |
1366 | ||
1367 | int register_inetaddr_notifier(struct notifier_block *nb) | |
1368 | { | |
e041c683 | 1369 | return blocking_notifier_chain_register(&inetaddr_chain, nb); |
1da177e4 | 1370 | } |
9f9354b9 | 1371 | EXPORT_SYMBOL(register_inetaddr_notifier); |
1da177e4 LT |
1372 | |
1373 | int unregister_inetaddr_notifier(struct notifier_block *nb) | |
1374 | { | |
e041c683 | 1375 | return blocking_notifier_chain_unregister(&inetaddr_chain, nb); |
1da177e4 | 1376 | } |
9f9354b9 | 1377 | EXPORT_SYMBOL(unregister_inetaddr_notifier); |
1da177e4 | 1378 | |
3ad7d246 KJ |
1379 | int register_inetaddr_validator_notifier(struct notifier_block *nb) |
1380 | { | |
1381 | return blocking_notifier_chain_register(&inetaddr_validator_chain, nb); | |
1382 | } | |
1383 | EXPORT_SYMBOL(register_inetaddr_validator_notifier); | |
1384 | ||
1385 | int unregister_inetaddr_validator_notifier(struct notifier_block *nb) | |
1386 | { | |
1387 | return blocking_notifier_chain_unregister(&inetaddr_validator_chain, | |
1388 | nb); | |
1389 | } | |
1390 | EXPORT_SYMBOL(unregister_inetaddr_validator_notifier); | |
1391 | ||
9f9354b9 ED |
1392 | /* Rename ifa_labels for a device name change. Make some effort to preserve |
1393 | * existing alias numbering and to create unique labels if possible. | |
1da177e4 LT |
1394 | */ |
1395 | static void inetdev_changename(struct net_device *dev, struct in_device *in_dev) | |
e905a9ed | 1396 | { |
1da177e4 LT |
1397 | struct in_ifaddr *ifa; |
1398 | int named = 0; | |
1399 | ||
e905a9ed YH |
1400 | for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { |
1401 | char old[IFNAMSIZ], *dot; | |
1da177e4 LT |
1402 | |
1403 | memcpy(old, ifa->ifa_label, IFNAMSIZ); | |
e905a9ed | 1404 | memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); |
1da177e4 | 1405 | if (named++ == 0) |
573bf470 | 1406 | goto skip; |
44344b2a | 1407 | dot = strchr(old, ':'); |
51456b29 | 1408 | if (!dot) { |
e905a9ed | 1409 | sprintf(old, ":%d", named); |
1da177e4 LT |
1410 | dot = old; |
1411 | } | |
9f9354b9 | 1412 | if (strlen(dot) + strlen(dev->name) < IFNAMSIZ) |
e905a9ed | 1413 | strcat(ifa->ifa_label, dot); |
9f9354b9 | 1414 | else |
e905a9ed | 1415 | strcpy(ifa->ifa_label + (IFNAMSIZ - strlen(dot) - 1), dot); |
573bf470 TG |
1416 | skip: |
1417 | rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0); | |
e905a9ed YH |
1418 | } |
1419 | } | |
1da177e4 | 1420 | |
40384999 | 1421 | static bool inetdev_valid_mtu(unsigned int mtu) |
06770843 BL |
1422 | { |
1423 | return mtu >= 68; | |
1424 | } | |
1425 | ||
d11327ad IC |
1426 | static void inetdev_send_gratuitous_arp(struct net_device *dev, |
1427 | struct in_device *in_dev) | |
1428 | ||
1429 | { | |
b76d0789 | 1430 | struct in_ifaddr *ifa; |
d11327ad | 1431 | |
b76d0789 ZK |
1432 | for (ifa = in_dev->ifa_list; ifa; |
1433 | ifa = ifa->ifa_next) { | |
1434 | arp_send(ARPOP_REQUEST, ETH_P_ARP, | |
1435 | ifa->ifa_local, dev, | |
1436 | ifa->ifa_local, NULL, | |
1437 | dev->dev_addr, NULL); | |
1438 | } | |
d11327ad IC |
1439 | } |
1440 | ||
1da177e4 LT |
1441 | /* Called only under RTNL semaphore */ |
1442 | ||
1443 | static int inetdev_event(struct notifier_block *this, unsigned long event, | |
1444 | void *ptr) | |
1445 | { | |
351638e7 | 1446 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
748e2d93 | 1447 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
0115e8e3 | 1448 | |
1da177e4 LT |
1449 | ASSERT_RTNL(); |
1450 | ||
1451 | if (!in_dev) { | |
8030f544 | 1452 | if (event == NETDEV_REGISTER) { |
1da177e4 | 1453 | in_dev = inetdev_init(dev); |
20e61da7 WC |
1454 | if (IS_ERR(in_dev)) |
1455 | return notifier_from_errno(PTR_ERR(in_dev)); | |
0cc217e1 | 1456 | if (dev->flags & IFF_LOOPBACK) { |
42f811b8 HX |
1457 | IN_DEV_CONF_SET(in_dev, NOXFRM, 1); |
1458 | IN_DEV_CONF_SET(in_dev, NOPOLICY, 1); | |
8030f544 | 1459 | } |
06770843 BL |
1460 | } else if (event == NETDEV_CHANGEMTU) { |
1461 | /* Re-enabling IP */ | |
1462 | if (inetdev_valid_mtu(dev->mtu)) | |
1463 | in_dev = inetdev_init(dev); | |
1da177e4 LT |
1464 | } |
1465 | goto out; | |
1466 | } | |
1467 | ||
1468 | switch (event) { | |
1469 | case NETDEV_REGISTER: | |
91df42be | 1470 | pr_debug("%s: bug\n", __func__); |
a9b3cd7f | 1471 | RCU_INIT_POINTER(dev->ip_ptr, NULL); |
1da177e4 LT |
1472 | break; |
1473 | case NETDEV_UP: | |
06770843 | 1474 | if (!inetdev_valid_mtu(dev->mtu)) |
1da177e4 | 1475 | break; |
0cc217e1 | 1476 | if (dev->flags & IFF_LOOPBACK) { |
9f9354b9 ED |
1477 | struct in_ifaddr *ifa = inet_alloc_ifa(); |
1478 | ||
1479 | if (ifa) { | |
fd23c3b3 | 1480 | INIT_HLIST_NODE(&ifa->hash); |
1da177e4 LT |
1481 | ifa->ifa_local = |
1482 | ifa->ifa_address = htonl(INADDR_LOOPBACK); | |
1483 | ifa->ifa_prefixlen = 8; | |
1484 | ifa->ifa_mask = inet_make_mask(8); | |
1485 | in_dev_hold(in_dev); | |
1486 | ifa->ifa_dev = in_dev; | |
1487 | ifa->ifa_scope = RT_SCOPE_HOST; | |
1488 | memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); | |
5c766d64 JP |
1489 | set_ifa_lifetime(ifa, INFINITY_LIFE_TIME, |
1490 | INFINITY_LIFE_TIME); | |
dfd1582d JP |
1491 | ipv4_devconf_setall(in_dev); |
1492 | neigh_parms_data_state_setall(in_dev->arp_parms); | |
1da177e4 LT |
1493 | inet_insert_ifa(ifa); |
1494 | } | |
1495 | } | |
1496 | ip_mc_up(in_dev); | |
eefef1cf SH |
1497 | /* fall through */ |
1498 | case NETDEV_CHANGEADDR: | |
d11327ad IC |
1499 | if (!IN_DEV_ARP_NOTIFY(in_dev)) |
1500 | break; | |
1501 | /* fall through */ | |
1502 | case NETDEV_NOTIFY_PEERS: | |
a21090cf | 1503 | /* Send gratuitous ARP to notify of link change */ |
d11327ad | 1504 | inetdev_send_gratuitous_arp(dev, in_dev); |
1da177e4 LT |
1505 | break; |
1506 | case NETDEV_DOWN: | |
1507 | ip_mc_down(in_dev); | |
1508 | break; | |
93d9b7d7 | 1509 | case NETDEV_PRE_TYPE_CHANGE: |
75c78500 MS |
1510 | ip_mc_unmap(in_dev); |
1511 | break; | |
93d9b7d7 | 1512 | case NETDEV_POST_TYPE_CHANGE: |
75c78500 MS |
1513 | ip_mc_remap(in_dev); |
1514 | break; | |
1da177e4 | 1515 | case NETDEV_CHANGEMTU: |
06770843 | 1516 | if (inetdev_valid_mtu(dev->mtu)) |
1da177e4 | 1517 | break; |
06770843 | 1518 | /* disable IP when MTU is not enough */ |
1da177e4 LT |
1519 | case NETDEV_UNREGISTER: |
1520 | inetdev_destroy(in_dev); | |
1521 | break; | |
1522 | case NETDEV_CHANGENAME: | |
1523 | /* Do not notify about label change, this event is | |
1524 | * not interesting to applications using netlink. | |
1525 | */ | |
1526 | inetdev_changename(dev, in_dev); | |
1527 | ||
51602b2a | 1528 | devinet_sysctl_unregister(in_dev); |
66f27a52 | 1529 | devinet_sysctl_register(in_dev); |
1da177e4 LT |
1530 | break; |
1531 | } | |
1532 | out: | |
1533 | return NOTIFY_DONE; | |
1534 | } | |
1535 | ||
1536 | static struct notifier_block ip_netdev_notifier = { | |
539afedf | 1537 | .notifier_call = inetdev_event, |
1da177e4 LT |
1538 | }; |
1539 | ||
40384999 | 1540 | static size_t inet_nlmsg_size(void) |
339bf98f TG |
1541 | { |
1542 | return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) | |
1543 | + nla_total_size(4) /* IFA_ADDRESS */ | |
1544 | + nla_total_size(4) /* IFA_LOCAL */ | |
1545 | + nla_total_size(4) /* IFA_BROADCAST */ | |
ad6c8135 | 1546 | + nla_total_size(IFNAMSIZ) /* IFA_LABEL */ |
63b5f152 GU |
1547 | + nla_total_size(4) /* IFA_FLAGS */ |
1548 | + nla_total_size(sizeof(struct ifa_cacheinfo)); /* IFA_CACHEINFO */ | |
339bf98f TG |
1549 | } |
1550 | ||
5c766d64 JP |
1551 | static inline u32 cstamp_delta(unsigned long cstamp) |
1552 | { | |
1553 | return (cstamp - INITIAL_JIFFIES) * 100UL / HZ; | |
1554 | } | |
1555 | ||
1556 | static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, | |
1557 | unsigned long tstamp, u32 preferred, u32 valid) | |
1558 | { | |
1559 | struct ifa_cacheinfo ci; | |
1560 | ||
1561 | ci.cstamp = cstamp_delta(cstamp); | |
1562 | ci.tstamp = cstamp_delta(tstamp); | |
1563 | ci.ifa_prefered = preferred; | |
1564 | ci.ifa_valid = valid; | |
1565 | ||
1566 | return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); | |
1567 | } | |
1568 | ||
1da177e4 | 1569 | static int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa, |
15e47304 | 1570 | u32 portid, u32 seq, int event, unsigned int flags) |
1da177e4 LT |
1571 | { |
1572 | struct ifaddrmsg *ifm; | |
1573 | struct nlmsghdr *nlh; | |
5c766d64 | 1574 | u32 preferred, valid; |
1da177e4 | 1575 | |
15e47304 | 1576 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*ifm), flags); |
51456b29 | 1577 | if (!nlh) |
26932566 | 1578 | return -EMSGSIZE; |
47f68512 TG |
1579 | |
1580 | ifm = nlmsg_data(nlh); | |
1da177e4 LT |
1581 | ifm->ifa_family = AF_INET; |
1582 | ifm->ifa_prefixlen = ifa->ifa_prefixlen; | |
5c766d64 | 1583 | ifm->ifa_flags = ifa->ifa_flags; |
1da177e4 LT |
1584 | ifm->ifa_scope = ifa->ifa_scope; |
1585 | ifm->ifa_index = ifa->ifa_dev->dev->ifindex; | |
47f68512 | 1586 | |
5c766d64 JP |
1587 | if (!(ifm->ifa_flags & IFA_F_PERMANENT)) { |
1588 | preferred = ifa->ifa_preferred_lft; | |
1589 | valid = ifa->ifa_valid_lft; | |
1590 | if (preferred != INFINITY_LIFE_TIME) { | |
1591 | long tval = (jiffies - ifa->ifa_tstamp) / HZ; | |
1592 | ||
1593 | if (preferred > tval) | |
1594 | preferred -= tval; | |
1595 | else | |
1596 | preferred = 0; | |
1597 | if (valid != INFINITY_LIFE_TIME) { | |
1598 | if (valid > tval) | |
1599 | valid -= tval; | |
1600 | else | |
1601 | valid = 0; | |
1602 | } | |
1603 | } | |
1604 | } else { | |
1605 | preferred = INFINITY_LIFE_TIME; | |
1606 | valid = INFINITY_LIFE_TIME; | |
1607 | } | |
f3756b79 | 1608 | if ((ifa->ifa_address && |
930345ea | 1609 | nla_put_in_addr(skb, IFA_ADDRESS, ifa->ifa_address)) || |
f3756b79 | 1610 | (ifa->ifa_local && |
930345ea | 1611 | nla_put_in_addr(skb, IFA_LOCAL, ifa->ifa_local)) || |
f3756b79 | 1612 | (ifa->ifa_broadcast && |
930345ea | 1613 | nla_put_in_addr(skb, IFA_BROADCAST, ifa->ifa_broadcast)) || |
f3756b79 | 1614 | (ifa->ifa_label[0] && |
5c766d64 | 1615 | nla_put_string(skb, IFA_LABEL, ifa->ifa_label)) || |
ad6c8135 | 1616 | nla_put_u32(skb, IFA_FLAGS, ifa->ifa_flags) || |
5c766d64 JP |
1617 | put_cacheinfo(skb, ifa->ifa_cstamp, ifa->ifa_tstamp, |
1618 | preferred, valid)) | |
f3756b79 | 1619 | goto nla_put_failure; |
1da177e4 | 1620 | |
053c095a JB |
1621 | nlmsg_end(skb, nlh); |
1622 | return 0; | |
47f68512 TG |
1623 | |
1624 | nla_put_failure: | |
26932566 PM |
1625 | nlmsg_cancel(skb, nlh); |
1626 | return -EMSGSIZE; | |
1da177e4 LT |
1627 | } |
1628 | ||
1629 | static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) | |
1630 | { | |
3b1e0a65 | 1631 | struct net *net = sock_net(skb->sk); |
eec4df98 ED |
1632 | int h, s_h; |
1633 | int idx, s_idx; | |
1634 | int ip_idx, s_ip_idx; | |
1da177e4 LT |
1635 | struct net_device *dev; |
1636 | struct in_device *in_dev; | |
1637 | struct in_ifaddr *ifa; | |
eec4df98 | 1638 | struct hlist_head *head; |
1da177e4 | 1639 | |
eec4df98 ED |
1640 | s_h = cb->args[0]; |
1641 | s_idx = idx = cb->args[1]; | |
1642 | s_ip_idx = ip_idx = cb->args[2]; | |
1643 | ||
1644 | for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { | |
1645 | idx = 0; | |
1646 | head = &net->dev_index_head[h]; | |
1647 | rcu_read_lock(); | |
0465277f ND |
1648 | cb->seq = atomic_read(&net->ipv4.dev_addr_genid) ^ |
1649 | net->dev_base_seq; | |
b67bfe0d | 1650 | hlist_for_each_entry_rcu(dev, head, index_hlist) { |
eec4df98 ED |
1651 | if (idx < s_idx) |
1652 | goto cont; | |
4b97efdf | 1653 | if (h > s_h || idx > s_idx) |
eec4df98 ED |
1654 | s_ip_idx = 0; |
1655 | in_dev = __in_dev_get_rcu(dev); | |
1656 | if (!in_dev) | |
1657 | goto cont; | |
1da177e4 | 1658 | |
eec4df98 ED |
1659 | for (ifa = in_dev->ifa_list, ip_idx = 0; ifa; |
1660 | ifa = ifa->ifa_next, ip_idx++) { | |
1661 | if (ip_idx < s_ip_idx) | |
1662 | continue; | |
1663 | if (inet_fill_ifaddr(skb, ifa, | |
15e47304 | 1664 | NETLINK_CB(cb->skb).portid, |
1da177e4 | 1665 | cb->nlh->nlmsg_seq, |
053c095a | 1666 | RTM_NEWADDR, NLM_F_MULTI) < 0) { |
eec4df98 ED |
1667 | rcu_read_unlock(); |
1668 | goto done; | |
1669 | } | |
0465277f | 1670 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); |
eec4df98 | 1671 | } |
7562f876 | 1672 | cont: |
eec4df98 ED |
1673 | idx++; |
1674 | } | |
1675 | rcu_read_unlock(); | |
1da177e4 LT |
1676 | } |
1677 | ||
1678 | done: | |
eec4df98 ED |
1679 | cb->args[0] = h; |
1680 | cb->args[1] = idx; | |
1681 | cb->args[2] = ip_idx; | |
1da177e4 LT |
1682 | |
1683 | return skb->len; | |
1684 | } | |
1685 | ||
539afedf | 1686 | static void rtmsg_ifa(int event, struct in_ifaddr *ifa, struct nlmsghdr *nlh, |
15e47304 | 1687 | u32 portid) |
1da177e4 | 1688 | { |
47f68512 | 1689 | struct sk_buff *skb; |
d6062cbb TG |
1690 | u32 seq = nlh ? nlh->nlmsg_seq : 0; |
1691 | int err = -ENOBUFS; | |
4b8aa9ab | 1692 | struct net *net; |
1da177e4 | 1693 | |
c346dca1 | 1694 | net = dev_net(ifa->ifa_dev->dev); |
339bf98f | 1695 | skb = nlmsg_new(inet_nlmsg_size(), GFP_KERNEL); |
51456b29 | 1696 | if (!skb) |
d6062cbb TG |
1697 | goto errout; |
1698 | ||
15e47304 | 1699 | err = inet_fill_ifaddr(skb, ifa, portid, seq, event, 0); |
26932566 PM |
1700 | if (err < 0) { |
1701 | /* -EMSGSIZE implies BUG in inet_nlmsg_size() */ | |
1702 | WARN_ON(err == -EMSGSIZE); | |
1703 | kfree_skb(skb); | |
1704 | goto errout; | |
1705 | } | |
15e47304 | 1706 | rtnl_notify(skb, net, portid, RTNLGRP_IPV4_IFADDR, nlh, GFP_KERNEL); |
1ce85fe4 | 1707 | return; |
d6062cbb TG |
1708 | errout: |
1709 | if (err < 0) | |
4b8aa9ab | 1710 | rtnl_set_sk_err(net, RTNLGRP_IPV4_IFADDR, err); |
1da177e4 LT |
1711 | } |
1712 | ||
b1974ed0 AR |
1713 | static size_t inet_get_link_af_size(const struct net_device *dev, |
1714 | u32 ext_filter_mask) | |
9f0f7272 | 1715 | { |
1fc19aff | 1716 | struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr); |
9f0f7272 TG |
1717 | |
1718 | if (!in_dev) | |
1719 | return 0; | |
1720 | ||
1721 | return nla_total_size(IPV4_DEVCONF_MAX * 4); /* IFLA_INET_CONF */ | |
1722 | } | |
1723 | ||
d5566fd7 SV |
1724 | static int inet_fill_link_af(struct sk_buff *skb, const struct net_device *dev, |
1725 | u32 ext_filter_mask) | |
9f0f7272 | 1726 | { |
1fc19aff | 1727 | struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr); |
9f0f7272 TG |
1728 | struct nlattr *nla; |
1729 | int i; | |
1730 | ||
1731 | if (!in_dev) | |
1732 | return -ENODATA; | |
1733 | ||
1734 | nla = nla_reserve(skb, IFLA_INET_CONF, IPV4_DEVCONF_MAX * 4); | |
51456b29 | 1735 | if (!nla) |
9f0f7272 TG |
1736 | return -EMSGSIZE; |
1737 | ||
1738 | for (i = 0; i < IPV4_DEVCONF_MAX; i++) | |
1739 | ((u32 *) nla_data(nla))[i] = in_dev->cnf.data[i]; | |
1740 | ||
1741 | return 0; | |
1742 | } | |
1743 | ||
1744 | static const struct nla_policy inet_af_policy[IFLA_INET_MAX+1] = { | |
1745 | [IFLA_INET_CONF] = { .type = NLA_NESTED }, | |
1746 | }; | |
1747 | ||
cf7afbfe TG |
1748 | static int inet_validate_link_af(const struct net_device *dev, |
1749 | const struct nlattr *nla) | |
9f0f7272 | 1750 | { |
9f0f7272 TG |
1751 | struct nlattr *a, *tb[IFLA_INET_MAX+1]; |
1752 | int err, rem; | |
1753 | ||
f7fce74e | 1754 | if (dev && !__in_dev_get_rtnl(dev)) |
cf7afbfe | 1755 | return -EAFNOSUPPORT; |
9f0f7272 | 1756 | |
fceb6435 | 1757 | err = nla_parse_nested(tb, IFLA_INET_MAX, nla, inet_af_policy, NULL); |
9f0f7272 TG |
1758 | if (err < 0) |
1759 | return err; | |
1760 | ||
1761 | if (tb[IFLA_INET_CONF]) { | |
1762 | nla_for_each_nested(a, tb[IFLA_INET_CONF], rem) { | |
1763 | int cfgid = nla_type(a); | |
1764 | ||
1765 | if (nla_len(a) < 4) | |
1766 | return -EINVAL; | |
1767 | ||
1768 | if (cfgid <= 0 || cfgid > IPV4_DEVCONF_MAX) | |
1769 | return -EINVAL; | |
1770 | } | |
1771 | } | |
1772 | ||
cf7afbfe TG |
1773 | return 0; |
1774 | } | |
1775 | ||
1776 | static int inet_set_link_af(struct net_device *dev, const struct nlattr *nla) | |
1777 | { | |
f7fce74e | 1778 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
cf7afbfe TG |
1779 | struct nlattr *a, *tb[IFLA_INET_MAX+1]; |
1780 | int rem; | |
1781 | ||
1782 | if (!in_dev) | |
1783 | return -EAFNOSUPPORT; | |
1784 | ||
fceb6435 | 1785 | if (nla_parse_nested(tb, IFLA_INET_MAX, nla, NULL, NULL) < 0) |
cf7afbfe TG |
1786 | BUG(); |
1787 | ||
9f0f7272 TG |
1788 | if (tb[IFLA_INET_CONF]) { |
1789 | nla_for_each_nested(a, tb[IFLA_INET_CONF], rem) | |
1790 | ipv4_devconf_set(in_dev, nla_type(a), nla_get_u32(a)); | |
1791 | } | |
1792 | ||
1793 | return 0; | |
1794 | } | |
1795 | ||
edc9e748 ND |
1796 | static int inet_netconf_msgsize_devconf(int type) |
1797 | { | |
1798 | int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) | |
1799 | + nla_total_size(4); /* NETCONFA_IFINDEX */ | |
136ba622 | 1800 | bool all = false; |
edc9e748 | 1801 | |
136ba622 ZS |
1802 | if (type == NETCONFA_ALL) |
1803 | all = true; | |
1804 | ||
1805 | if (all || type == NETCONFA_FORWARDING) | |
edc9e748 | 1806 | size += nla_total_size(4); |
136ba622 | 1807 | if (all || type == NETCONFA_RP_FILTER) |
cc535dfb | 1808 | size += nla_total_size(4); |
136ba622 | 1809 | if (all || type == NETCONFA_MC_FORWARDING) |
d67b8c61 | 1810 | size += nla_total_size(4); |
136ba622 | 1811 | if (all || type == NETCONFA_PROXY_NEIGH) |
f085ff1c | 1812 | size += nla_total_size(4); |
136ba622 | 1813 | if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) |
974d7af5 | 1814 | size += nla_total_size(4); |
edc9e748 ND |
1815 | |
1816 | return size; | |
1817 | } | |
1818 | ||
1819 | static int inet_netconf_fill_devconf(struct sk_buff *skb, int ifindex, | |
1820 | struct ipv4_devconf *devconf, u32 portid, | |
1821 | u32 seq, int event, unsigned int flags, | |
1822 | int type) | |
1823 | { | |
1824 | struct nlmsghdr *nlh; | |
1825 | struct netconfmsg *ncm; | |
136ba622 | 1826 | bool all = false; |
edc9e748 ND |
1827 | |
1828 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), | |
1829 | flags); | |
51456b29 | 1830 | if (!nlh) |
edc9e748 ND |
1831 | return -EMSGSIZE; |
1832 | ||
136ba622 ZS |
1833 | if (type == NETCONFA_ALL) |
1834 | all = true; | |
1835 | ||
edc9e748 ND |
1836 | ncm = nlmsg_data(nlh); |
1837 | ncm->ncm_family = AF_INET; | |
1838 | ||
1839 | if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0) | |
1840 | goto nla_put_failure; | |
1841 | ||
b5c9641d DA |
1842 | if (!devconf) |
1843 | goto out; | |
1844 | ||
136ba622 | 1845 | if ((all || type == NETCONFA_FORWARDING) && |
edc9e748 ND |
1846 | nla_put_s32(skb, NETCONFA_FORWARDING, |
1847 | IPV4_DEVCONF(*devconf, FORWARDING)) < 0) | |
1848 | goto nla_put_failure; | |
136ba622 | 1849 | if ((all || type == NETCONFA_RP_FILTER) && |
cc535dfb ND |
1850 | nla_put_s32(skb, NETCONFA_RP_FILTER, |
1851 | IPV4_DEVCONF(*devconf, RP_FILTER)) < 0) | |
1852 | goto nla_put_failure; | |
136ba622 | 1853 | if ((all || type == NETCONFA_MC_FORWARDING) && |
d67b8c61 ND |
1854 | nla_put_s32(skb, NETCONFA_MC_FORWARDING, |
1855 | IPV4_DEVCONF(*devconf, MC_FORWARDING)) < 0) | |
1856 | goto nla_put_failure; | |
136ba622 | 1857 | if ((all || type == NETCONFA_PROXY_NEIGH) && |
09aea5df | 1858 | nla_put_s32(skb, NETCONFA_PROXY_NEIGH, |
f085ff1c | 1859 | IPV4_DEVCONF(*devconf, PROXY_ARP)) < 0) |
1860 | goto nla_put_failure; | |
136ba622 | 1861 | if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) && |
974d7af5 AG |
1862 | nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, |
1863 | IPV4_DEVCONF(*devconf, IGNORE_ROUTES_WITH_LINKDOWN)) < 0) | |
1864 | goto nla_put_failure; | |
edc9e748 | 1865 | |
b5c9641d | 1866 | out: |
053c095a JB |
1867 | nlmsg_end(skb, nlh); |
1868 | return 0; | |
edc9e748 ND |
1869 | |
1870 | nla_put_failure: | |
1871 | nlmsg_cancel(skb, nlh); | |
1872 | return -EMSGSIZE; | |
1873 | } | |
1874 | ||
3b022865 DA |
1875 | void inet_netconf_notify_devconf(struct net *net, int event, int type, |
1876 | int ifindex, struct ipv4_devconf *devconf) | |
edc9e748 ND |
1877 | { |
1878 | struct sk_buff *skb; | |
1879 | int err = -ENOBUFS; | |
1880 | ||
fa17806c | 1881 | skb = nlmsg_new(inet_netconf_msgsize_devconf(type), GFP_KERNEL); |
51456b29 | 1882 | if (!skb) |
edc9e748 ND |
1883 | goto errout; |
1884 | ||
1885 | err = inet_netconf_fill_devconf(skb, ifindex, devconf, 0, 0, | |
3b022865 | 1886 | event, 0, type); |
edc9e748 ND |
1887 | if (err < 0) { |
1888 | /* -EMSGSIZE implies BUG in inet_netconf_msgsize_devconf() */ | |
1889 | WARN_ON(err == -EMSGSIZE); | |
1890 | kfree_skb(skb); | |
1891 | goto errout; | |
1892 | } | |
fa17806c | 1893 | rtnl_notify(skb, net, 0, RTNLGRP_IPV4_NETCONF, NULL, GFP_KERNEL); |
edc9e748 ND |
1894 | return; |
1895 | errout: | |
1896 | if (err < 0) | |
1897 | rtnl_set_sk_err(net, RTNLGRP_IPV4_NETCONF, err); | |
1898 | } | |
1899 | ||
9e551110 ND |
1900 | static const struct nla_policy devconf_ipv4_policy[NETCONFA_MAX+1] = { |
1901 | [NETCONFA_IFINDEX] = { .len = sizeof(int) }, | |
1902 | [NETCONFA_FORWARDING] = { .len = sizeof(int) }, | |
cc535dfb | 1903 | [NETCONFA_RP_FILTER] = { .len = sizeof(int) }, |
09aea5df | 1904 | [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) }, |
974d7af5 | 1905 | [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) }, |
9e551110 ND |
1906 | }; |
1907 | ||
1908 | static int inet_netconf_get_devconf(struct sk_buff *in_skb, | |
c21ef3e3 DA |
1909 | struct nlmsghdr *nlh, |
1910 | struct netlink_ext_ack *extack) | |
9e551110 ND |
1911 | { |
1912 | struct net *net = sock_net(in_skb->sk); | |
1913 | struct nlattr *tb[NETCONFA_MAX+1]; | |
1914 | struct netconfmsg *ncm; | |
1915 | struct sk_buff *skb; | |
1916 | struct ipv4_devconf *devconf; | |
1917 | struct in_device *in_dev; | |
1918 | struct net_device *dev; | |
1919 | int ifindex; | |
1920 | int err; | |
1921 | ||
1922 | err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX, | |
c21ef3e3 | 1923 | devconf_ipv4_policy, extack); |
9e551110 ND |
1924 | if (err < 0) |
1925 | goto errout; | |
1926 | ||
a97eb33f | 1927 | err = -EINVAL; |
9e551110 ND |
1928 | if (!tb[NETCONFA_IFINDEX]) |
1929 | goto errout; | |
1930 | ||
1931 | ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); | |
1932 | switch (ifindex) { | |
1933 | case NETCONFA_IFINDEX_ALL: | |
1934 | devconf = net->ipv4.devconf_all; | |
1935 | break; | |
1936 | case NETCONFA_IFINDEX_DEFAULT: | |
1937 | devconf = net->ipv4.devconf_dflt; | |
1938 | break; | |
1939 | default: | |
1940 | dev = __dev_get_by_index(net, ifindex); | |
51456b29 | 1941 | if (!dev) |
9e551110 ND |
1942 | goto errout; |
1943 | in_dev = __in_dev_get_rtnl(dev); | |
51456b29 | 1944 | if (!in_dev) |
9e551110 ND |
1945 | goto errout; |
1946 | devconf = &in_dev->cnf; | |
1947 | break; | |
1948 | } | |
1949 | ||
1950 | err = -ENOBUFS; | |
fa17806c | 1951 | skb = nlmsg_new(inet_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL); |
51456b29 | 1952 | if (!skb) |
9e551110 ND |
1953 | goto errout; |
1954 | ||
1955 | err = inet_netconf_fill_devconf(skb, ifindex, devconf, | |
1956 | NETLINK_CB(in_skb).portid, | |
1957 | nlh->nlmsg_seq, RTM_NEWNETCONF, 0, | |
136ba622 | 1958 | NETCONFA_ALL); |
9e551110 ND |
1959 | if (err < 0) { |
1960 | /* -EMSGSIZE implies BUG in inet_netconf_msgsize_devconf() */ | |
1961 | WARN_ON(err == -EMSGSIZE); | |
1962 | kfree_skb(skb); | |
1963 | goto errout; | |
1964 | } | |
1965 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); | |
1966 | errout: | |
1967 | return err; | |
1968 | } | |
1969 | ||
7a674200 ND |
1970 | static int inet_netconf_dump_devconf(struct sk_buff *skb, |
1971 | struct netlink_callback *cb) | |
1972 | { | |
1973 | struct net *net = sock_net(skb->sk); | |
1974 | int h, s_h; | |
1975 | int idx, s_idx; | |
1976 | struct net_device *dev; | |
1977 | struct in_device *in_dev; | |
1978 | struct hlist_head *head; | |
1979 | ||
1980 | s_h = cb->args[0]; | |
1981 | s_idx = idx = cb->args[1]; | |
1982 | ||
1983 | for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { | |
1984 | idx = 0; | |
1985 | head = &net->dev_index_head[h]; | |
1986 | rcu_read_lock(); | |
0465277f ND |
1987 | cb->seq = atomic_read(&net->ipv4.dev_addr_genid) ^ |
1988 | net->dev_base_seq; | |
7a674200 ND |
1989 | hlist_for_each_entry_rcu(dev, head, index_hlist) { |
1990 | if (idx < s_idx) | |
1991 | goto cont; | |
1992 | in_dev = __in_dev_get_rcu(dev); | |
1993 | if (!in_dev) | |
1994 | goto cont; | |
1995 | ||
1996 | if (inet_netconf_fill_devconf(skb, dev->ifindex, | |
1997 | &in_dev->cnf, | |
1998 | NETLINK_CB(cb->skb).portid, | |
1999 | cb->nlh->nlmsg_seq, | |
2000 | RTM_NEWNETCONF, | |
2001 | NLM_F_MULTI, | |
136ba622 | 2002 | NETCONFA_ALL) < 0) { |
7a674200 ND |
2003 | rcu_read_unlock(); |
2004 | goto done; | |
2005 | } | |
0465277f | 2006 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); |
7a674200 ND |
2007 | cont: |
2008 | idx++; | |
2009 | } | |
2010 | rcu_read_unlock(); | |
2011 | } | |
2012 | if (h == NETDEV_HASHENTRIES) { | |
2013 | if (inet_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL, | |
2014 | net->ipv4.devconf_all, | |
2015 | NETLINK_CB(cb->skb).portid, | |
2016 | cb->nlh->nlmsg_seq, | |
2017 | RTM_NEWNETCONF, NLM_F_MULTI, | |
136ba622 | 2018 | NETCONFA_ALL) < 0) |
7a674200 ND |
2019 | goto done; |
2020 | else | |
2021 | h++; | |
2022 | } | |
2023 | if (h == NETDEV_HASHENTRIES + 1) { | |
2024 | if (inet_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT, | |
2025 | net->ipv4.devconf_dflt, | |
2026 | NETLINK_CB(cb->skb).portid, | |
2027 | cb->nlh->nlmsg_seq, | |
2028 | RTM_NEWNETCONF, NLM_F_MULTI, | |
136ba622 | 2029 | NETCONFA_ALL) < 0) |
7a674200 ND |
2030 | goto done; |
2031 | else | |
2032 | h++; | |
2033 | } | |
2034 | done: | |
2035 | cb->args[0] = h; | |
2036 | cb->args[1] = idx; | |
2037 | ||
2038 | return skb->len; | |
2039 | } | |
2040 | ||
1da177e4 LT |
2041 | #ifdef CONFIG_SYSCTL |
2042 | ||
c0ce9fb3 | 2043 | static void devinet_copy_dflt_conf(struct net *net, int i) |
31be3085 HX |
2044 | { |
2045 | struct net_device *dev; | |
2046 | ||
c6d14c84 ED |
2047 | rcu_read_lock(); |
2048 | for_each_netdev_rcu(net, dev) { | |
31be3085 | 2049 | struct in_device *in_dev; |
c6d14c84 | 2050 | |
31be3085 HX |
2051 | in_dev = __in_dev_get_rcu(dev); |
2052 | if (in_dev && !test_bit(i, in_dev->cnf.state)) | |
9355bbd6 | 2053 | in_dev->cnf.data[i] = net->ipv4.devconf_dflt->data[i]; |
31be3085 | 2054 | } |
c6d14c84 | 2055 | rcu_read_unlock(); |
31be3085 HX |
2056 | } |
2057 | ||
c6d14c84 | 2058 | /* called with RTNL locked */ |
c0ce9fb3 | 2059 | static void inet_forward_change(struct net *net) |
68dd299b PE |
2060 | { |
2061 | struct net_device *dev; | |
586f1211 | 2062 | int on = IPV4_DEVCONF_ALL(net, FORWARDING); |
68dd299b | 2063 | |
586f1211 | 2064 | IPV4_DEVCONF_ALL(net, ACCEPT_REDIRECTS) = !on; |
9355bbd6 | 2065 | IPV4_DEVCONF_DFLT(net, FORWARDING) = on; |
3b022865 DA |
2066 | inet_netconf_notify_devconf(net, RTM_NEWNETCONF, |
2067 | NETCONFA_FORWARDING, | |
edc9e748 ND |
2068 | NETCONFA_IFINDEX_ALL, |
2069 | net->ipv4.devconf_all); | |
3b022865 DA |
2070 | inet_netconf_notify_devconf(net, RTM_NEWNETCONF, |
2071 | NETCONFA_FORWARDING, | |
edc9e748 ND |
2072 | NETCONFA_IFINDEX_DEFAULT, |
2073 | net->ipv4.devconf_dflt); | |
68dd299b | 2074 | |
c0ce9fb3 | 2075 | for_each_netdev(net, dev) { |
68dd299b | 2076 | struct in_device *in_dev; |
fa17806c | 2077 | |
0187bdfb BH |
2078 | if (on) |
2079 | dev_disable_lro(dev); | |
fa17806c ED |
2080 | |
2081 | in_dev = __in_dev_get_rtnl(dev); | |
edc9e748 | 2082 | if (in_dev) { |
68dd299b | 2083 | IN_DEV_CONF_SET(in_dev, FORWARDING, on); |
3b022865 DA |
2084 | inet_netconf_notify_devconf(net, RTM_NEWNETCONF, |
2085 | NETCONFA_FORWARDING, | |
edc9e748 ND |
2086 | dev->ifindex, &in_dev->cnf); |
2087 | } | |
68dd299b | 2088 | } |
68dd299b PE |
2089 | } |
2090 | ||
f085ff1c | 2091 | static int devinet_conf_ifindex(struct net *net, struct ipv4_devconf *cnf) |
2092 | { | |
2093 | if (cnf == net->ipv4.devconf_dflt) | |
2094 | return NETCONFA_IFINDEX_DEFAULT; | |
2095 | else if (cnf == net->ipv4.devconf_all) | |
2096 | return NETCONFA_IFINDEX_ALL; | |
2097 | else { | |
2098 | struct in_device *idev | |
2099 | = container_of(cnf, struct in_device, cnf); | |
2100 | return idev->dev->ifindex; | |
2101 | } | |
2102 | } | |
2103 | ||
fe2c6338 | 2104 | static int devinet_conf_proc(struct ctl_table *ctl, int write, |
8d65af78 | 2105 | void __user *buffer, |
31be3085 HX |
2106 | size_t *lenp, loff_t *ppos) |
2107 | { | |
d01ff0a0 | 2108 | int old_value = *(int *)ctl->data; |
8d65af78 | 2109 | int ret = proc_dointvec(ctl, write, buffer, lenp, ppos); |
d01ff0a0 | 2110 | int new_value = *(int *)ctl->data; |
31be3085 HX |
2111 | |
2112 | if (write) { | |
2113 | struct ipv4_devconf *cnf = ctl->extra1; | |
c0ce9fb3 | 2114 | struct net *net = ctl->extra2; |
31be3085 | 2115 | int i = (int *)ctl->data - cnf->data; |
f085ff1c | 2116 | int ifindex; |
31be3085 HX |
2117 | |
2118 | set_bit(i, cnf->state); | |
2119 | ||
9355bbd6 | 2120 | if (cnf == net->ipv4.devconf_dflt) |
c0ce9fb3 | 2121 | devinet_copy_dflt_conf(net, i); |
d0daebc3 TG |
2122 | if (i == IPV4_DEVCONF_ACCEPT_LOCAL - 1 || |
2123 | i == IPV4_DEVCONF_ROUTE_LOCALNET - 1) | |
d01ff0a0 | 2124 | if ((new_value == 0) && (old_value != 0)) |
4ccfe6d4 | 2125 | rt_cache_flush(net); |
f085ff1c | 2126 | |
cc535dfb ND |
2127 | if (i == IPV4_DEVCONF_RP_FILTER - 1 && |
2128 | new_value != old_value) { | |
f085ff1c | 2129 | ifindex = devinet_conf_ifindex(net, cnf); |
3b022865 DA |
2130 | inet_netconf_notify_devconf(net, RTM_NEWNETCONF, |
2131 | NETCONFA_RP_FILTER, | |
cc535dfb ND |
2132 | ifindex, cnf); |
2133 | } | |
f085ff1c | 2134 | if (i == IPV4_DEVCONF_PROXY_ARP - 1 && |
2135 | new_value != old_value) { | |
2136 | ifindex = devinet_conf_ifindex(net, cnf); | |
3b022865 DA |
2137 | inet_netconf_notify_devconf(net, RTM_NEWNETCONF, |
2138 | NETCONFA_PROXY_NEIGH, | |
f085ff1c | 2139 | ifindex, cnf); |
2140 | } | |
974d7af5 AG |
2141 | if (i == IPV4_DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN - 1 && |
2142 | new_value != old_value) { | |
2143 | ifindex = devinet_conf_ifindex(net, cnf); | |
3b022865 DA |
2144 | inet_netconf_notify_devconf(net, RTM_NEWNETCONF, |
2145 | NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, | |
974d7af5 AG |
2146 | ifindex, cnf); |
2147 | } | |
31be3085 HX |
2148 | } |
2149 | ||
2150 | return ret; | |
2151 | } | |
2152 | ||
fe2c6338 | 2153 | static int devinet_sysctl_forward(struct ctl_table *ctl, int write, |
8d65af78 | 2154 | void __user *buffer, |
1da177e4 LT |
2155 | size_t *lenp, loff_t *ppos) |
2156 | { | |
2157 | int *valp = ctl->data; | |
2158 | int val = *valp; | |
88af182e | 2159 | loff_t pos = *ppos; |
8d65af78 | 2160 | int ret = proc_dointvec(ctl, write, buffer, lenp, ppos); |
1da177e4 LT |
2161 | |
2162 | if (write && *valp != val) { | |
c0ce9fb3 PE |
2163 | struct net *net = ctl->extra2; |
2164 | ||
0187bdfb | 2165 | if (valp != &IPV4_DEVCONF_DFLT(net, FORWARDING)) { |
88af182e EB |
2166 | if (!rtnl_trylock()) { |
2167 | /* Restore the original values before restarting */ | |
2168 | *valp = val; | |
2169 | *ppos = pos; | |
9b8adb5e | 2170 | return restart_syscall(); |
88af182e | 2171 | } |
0187bdfb BH |
2172 | if (valp == &IPV4_DEVCONF_ALL(net, FORWARDING)) { |
2173 | inet_forward_change(net); | |
edc9e748 | 2174 | } else { |
0187bdfb BH |
2175 | struct ipv4_devconf *cnf = ctl->extra1; |
2176 | struct in_device *idev = | |
2177 | container_of(cnf, struct in_device, cnf); | |
edc9e748 ND |
2178 | if (*valp) |
2179 | dev_disable_lro(idev->dev); | |
3b022865 | 2180 | inet_netconf_notify_devconf(net, RTM_NEWNETCONF, |
edc9e748 ND |
2181 | NETCONFA_FORWARDING, |
2182 | idev->dev->ifindex, | |
2183 | cnf); | |
0187bdfb BH |
2184 | } |
2185 | rtnl_unlock(); | |
4ccfe6d4 | 2186 | rt_cache_flush(net); |
edc9e748 | 2187 | } else |
3b022865 DA |
2188 | inet_netconf_notify_devconf(net, RTM_NEWNETCONF, |
2189 | NETCONFA_FORWARDING, | |
edc9e748 ND |
2190 | NETCONFA_IFINDEX_DEFAULT, |
2191 | net->ipv4.devconf_dflt); | |
1da177e4 LT |
2192 | } |
2193 | ||
2194 | return ret; | |
2195 | } | |
2196 | ||
fe2c6338 | 2197 | static int ipv4_doint_and_flush(struct ctl_table *ctl, int write, |
323e126f DM |
2198 | void __user *buffer, |
2199 | size_t *lenp, loff_t *ppos) | |
1da177e4 LT |
2200 | { |
2201 | int *valp = ctl->data; | |
2202 | int val = *valp; | |
8d65af78 | 2203 | int ret = proc_dointvec(ctl, write, buffer, lenp, ppos); |
76e6ebfb | 2204 | struct net *net = ctl->extra2; |
1da177e4 LT |
2205 | |
2206 | if (write && *valp != val) | |
4ccfe6d4 | 2207 | rt_cache_flush(net); |
1da177e4 LT |
2208 | |
2209 | return ret; | |
2210 | } | |
2211 | ||
f8572d8f | 2212 | #define DEVINET_SYSCTL_ENTRY(attr, name, mval, proc) \ |
42f811b8 | 2213 | { \ |
42f811b8 HX |
2214 | .procname = name, \ |
2215 | .data = ipv4_devconf.data + \ | |
02291680 | 2216 | IPV4_DEVCONF_ ## attr - 1, \ |
42f811b8 HX |
2217 | .maxlen = sizeof(int), \ |
2218 | .mode = mval, \ | |
2219 | .proc_handler = proc, \ | |
31be3085 | 2220 | .extra1 = &ipv4_devconf, \ |
42f811b8 HX |
2221 | } |
2222 | ||
2223 | #define DEVINET_SYSCTL_RW_ENTRY(attr, name) \ | |
f8572d8f | 2224 | DEVINET_SYSCTL_ENTRY(attr, name, 0644, devinet_conf_proc) |
42f811b8 HX |
2225 | |
2226 | #define DEVINET_SYSCTL_RO_ENTRY(attr, name) \ | |
f8572d8f | 2227 | DEVINET_SYSCTL_ENTRY(attr, name, 0444, devinet_conf_proc) |
42f811b8 | 2228 | |
f8572d8f EB |
2229 | #define DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, proc) \ |
2230 | DEVINET_SYSCTL_ENTRY(attr, name, 0644, proc) | |
42f811b8 HX |
2231 | |
2232 | #define DEVINET_SYSCTL_FLUSHING_ENTRY(attr, name) \ | |
f8572d8f | 2233 | DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, ipv4_doint_and_flush) |
42f811b8 | 2234 | |
1da177e4 LT |
2235 | static struct devinet_sysctl_table { |
2236 | struct ctl_table_header *sysctl_header; | |
02291680 | 2237 | struct ctl_table devinet_vars[__IPV4_DEVCONF_MAX]; |
1da177e4 LT |
2238 | } devinet_sysctl = { |
2239 | .devinet_vars = { | |
42f811b8 | 2240 | DEVINET_SYSCTL_COMPLEX_ENTRY(FORWARDING, "forwarding", |
f8572d8f | 2241 | devinet_sysctl_forward), |
42f811b8 HX |
2242 | DEVINET_SYSCTL_RO_ENTRY(MC_FORWARDING, "mc_forwarding"), |
2243 | ||
2244 | DEVINET_SYSCTL_RW_ENTRY(ACCEPT_REDIRECTS, "accept_redirects"), | |
2245 | DEVINET_SYSCTL_RW_ENTRY(SECURE_REDIRECTS, "secure_redirects"), | |
2246 | DEVINET_SYSCTL_RW_ENTRY(SHARED_MEDIA, "shared_media"), | |
2247 | DEVINET_SYSCTL_RW_ENTRY(RP_FILTER, "rp_filter"), | |
2248 | DEVINET_SYSCTL_RW_ENTRY(SEND_REDIRECTS, "send_redirects"), | |
2249 | DEVINET_SYSCTL_RW_ENTRY(ACCEPT_SOURCE_ROUTE, | |
2250 | "accept_source_route"), | |
8153a10c | 2251 | DEVINET_SYSCTL_RW_ENTRY(ACCEPT_LOCAL, "accept_local"), |
28f6aeea | 2252 | DEVINET_SYSCTL_RW_ENTRY(SRC_VMARK, "src_valid_mark"), |
42f811b8 HX |
2253 | DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP, "proxy_arp"), |
2254 | DEVINET_SYSCTL_RW_ENTRY(MEDIUM_ID, "medium_id"), | |
2255 | DEVINET_SYSCTL_RW_ENTRY(BOOTP_RELAY, "bootp_relay"), | |
2256 | DEVINET_SYSCTL_RW_ENTRY(LOG_MARTIANS, "log_martians"), | |
2257 | DEVINET_SYSCTL_RW_ENTRY(TAG, "tag"), | |
2258 | DEVINET_SYSCTL_RW_ENTRY(ARPFILTER, "arp_filter"), | |
2259 | DEVINET_SYSCTL_RW_ENTRY(ARP_ANNOUNCE, "arp_announce"), | |
2260 | DEVINET_SYSCTL_RW_ENTRY(ARP_IGNORE, "arp_ignore"), | |
2261 | DEVINET_SYSCTL_RW_ENTRY(ARP_ACCEPT, "arp_accept"), | |
eefef1cf | 2262 | DEVINET_SYSCTL_RW_ENTRY(ARP_NOTIFY, "arp_notify"), |
65324144 | 2263 | DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP_PVLAN, "proxy_arp_pvlan"), |
5c6fe01c WM |
2264 | DEVINET_SYSCTL_RW_ENTRY(FORCE_IGMP_VERSION, |
2265 | "force_igmp_version"), | |
2690048c WM |
2266 | DEVINET_SYSCTL_RW_ENTRY(IGMPV2_UNSOLICITED_REPORT_INTERVAL, |
2267 | "igmpv2_unsolicited_report_interval"), | |
2268 | DEVINET_SYSCTL_RW_ENTRY(IGMPV3_UNSOLICITED_REPORT_INTERVAL, | |
2269 | "igmpv3_unsolicited_report_interval"), | |
0eeb075f AG |
2270 | DEVINET_SYSCTL_RW_ENTRY(IGNORE_ROUTES_WITH_LINKDOWN, |
2271 | "ignore_routes_with_linkdown"), | |
97daf331 JB |
2272 | DEVINET_SYSCTL_RW_ENTRY(DROP_GRATUITOUS_ARP, |
2273 | "drop_gratuitous_arp"), | |
42f811b8 HX |
2274 | |
2275 | DEVINET_SYSCTL_FLUSHING_ENTRY(NOXFRM, "disable_xfrm"), | |
2276 | DEVINET_SYSCTL_FLUSHING_ENTRY(NOPOLICY, "disable_policy"), | |
42f811b8 HX |
2277 | DEVINET_SYSCTL_FLUSHING_ENTRY(PROMOTE_SECONDARIES, |
2278 | "promote_secondaries"), | |
d0daebc3 TG |
2279 | DEVINET_SYSCTL_FLUSHING_ENTRY(ROUTE_LOCALNET, |
2280 | "route_localnet"), | |
12b74dfa JB |
2281 | DEVINET_SYSCTL_FLUSHING_ENTRY(DROP_UNICAST_IN_L2_MULTICAST, |
2282 | "drop_unicast_in_l2_multicast"), | |
1da177e4 | 2283 | }, |
1da177e4 LT |
2284 | }; |
2285 | ||
ea40b324 | 2286 | static int __devinet_sysctl_register(struct net *net, char *dev_name, |
29c994e3 | 2287 | int ifindex, struct ipv4_devconf *p) |
1da177e4 LT |
2288 | { |
2289 | int i; | |
9fa89642 | 2290 | struct devinet_sysctl_table *t; |
8607ddb8 | 2291 | char path[sizeof("net/ipv4/conf/") + IFNAMSIZ]; |
bfada697 | 2292 | |
9fa89642 | 2293 | t = kmemdup(&devinet_sysctl, sizeof(*t), GFP_KERNEL); |
1da177e4 | 2294 | if (!t) |
9fa89642 PE |
2295 | goto out; |
2296 | ||
1da177e4 LT |
2297 | for (i = 0; i < ARRAY_SIZE(t->devinet_vars) - 1; i++) { |
2298 | t->devinet_vars[i].data += (char *)p - (char *)&ipv4_devconf; | |
31be3085 | 2299 | t->devinet_vars[i].extra1 = p; |
c0ce9fb3 | 2300 | t->devinet_vars[i].extra2 = net; |
1da177e4 LT |
2301 | } |
2302 | ||
8607ddb8 | 2303 | snprintf(path, sizeof(path), "net/ipv4/conf/%s", dev_name); |
1da177e4 | 2304 | |
8607ddb8 | 2305 | t->sysctl_header = register_net_sysctl(net, path, t->devinet_vars); |
1da177e4 | 2306 | if (!t->sysctl_header) |
8607ddb8 | 2307 | goto free; |
1da177e4 LT |
2308 | |
2309 | p->sysctl = t; | |
29c994e3 | 2310 | |
3b022865 DA |
2311 | inet_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL, |
2312 | ifindex, p); | |
ea40b324 | 2313 | return 0; |
1da177e4 | 2314 | |
9fa89642 | 2315 | free: |
1da177e4 | 2316 | kfree(t); |
9fa89642 | 2317 | out: |
ea40b324 | 2318 | return -ENOBUFS; |
1da177e4 LT |
2319 | } |
2320 | ||
b5c9641d DA |
2321 | static void __devinet_sysctl_unregister(struct net *net, |
2322 | struct ipv4_devconf *cnf, int ifindex) | |
51602b2a PE |
2323 | { |
2324 | struct devinet_sysctl_table *t = cnf->sysctl; | |
2325 | ||
b5c9641d DA |
2326 | if (t) { |
2327 | cnf->sysctl = NULL; | |
2328 | unregister_net_sysctl_table(t->sysctl_header); | |
2329 | kfree(t); | |
2330 | } | |
51602b2a | 2331 | |
b5c9641d | 2332 | inet_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL); |
51602b2a PE |
2333 | } |
2334 | ||
20e61da7 | 2335 | static int devinet_sysctl_register(struct in_device *idev) |
66f27a52 | 2336 | { |
20e61da7 WC |
2337 | int err; |
2338 | ||
2339 | if (!sysctl_dev_name_is_allowed(idev->dev->name)) | |
2340 | return -EINVAL; | |
2341 | ||
2342 | err = neigh_sysctl_register(idev->dev, idev->arp_parms, NULL); | |
2343 | if (err) | |
2344 | return err; | |
2345 | err = __devinet_sysctl_register(dev_net(idev->dev), idev->dev->name, | |
29c994e3 | 2346 | idev->dev->ifindex, &idev->cnf); |
20e61da7 WC |
2347 | if (err) |
2348 | neigh_sysctl_unregister(idev->arp_parms); | |
2349 | return err; | |
66f27a52 PE |
2350 | } |
2351 | ||
51602b2a | 2352 | static void devinet_sysctl_unregister(struct in_device *idev) |
1da177e4 | 2353 | { |
b5c9641d DA |
2354 | struct net *net = dev_net(idev->dev); |
2355 | ||
2356 | __devinet_sysctl_unregister(net, &idev->cnf, idev->dev->ifindex); | |
51602b2a | 2357 | neigh_sysctl_unregister(idev->arp_parms); |
1da177e4 | 2358 | } |
1da177e4 | 2359 | |
68dd299b PE |
2360 | static struct ctl_table ctl_forward_entry[] = { |
2361 | { | |
68dd299b PE |
2362 | .procname = "ip_forward", |
2363 | .data = &ipv4_devconf.data[ | |
02291680 | 2364 | IPV4_DEVCONF_FORWARDING - 1], |
68dd299b PE |
2365 | .maxlen = sizeof(int), |
2366 | .mode = 0644, | |
2367 | .proc_handler = devinet_sysctl_forward, | |
68dd299b | 2368 | .extra1 = &ipv4_devconf, |
c0ce9fb3 | 2369 | .extra2 = &init_net, |
68dd299b PE |
2370 | }, |
2371 | { }, | |
2372 | }; | |
2a75de0c | 2373 | #endif |
68dd299b | 2374 | |
752d14dc PE |
2375 | static __net_init int devinet_init_net(struct net *net) |
2376 | { | |
2377 | int err; | |
752d14dc | 2378 | struct ipv4_devconf *all, *dflt; |
2a75de0c ED |
2379 | #ifdef CONFIG_SYSCTL |
2380 | struct ctl_table *tbl = ctl_forward_entry; | |
752d14dc | 2381 | struct ctl_table_header *forw_hdr; |
2a75de0c | 2382 | #endif |
752d14dc PE |
2383 | |
2384 | err = -ENOMEM; | |
2385 | all = &ipv4_devconf; | |
2386 | dflt = &ipv4_devconf_dflt; | |
752d14dc | 2387 | |
09ad9bc7 | 2388 | if (!net_eq(net, &init_net)) { |
752d14dc | 2389 | all = kmemdup(all, sizeof(ipv4_devconf), GFP_KERNEL); |
51456b29 | 2390 | if (!all) |
752d14dc PE |
2391 | goto err_alloc_all; |
2392 | ||
2393 | dflt = kmemdup(dflt, sizeof(ipv4_devconf_dflt), GFP_KERNEL); | |
51456b29 | 2394 | if (!dflt) |
752d14dc PE |
2395 | goto err_alloc_dflt; |
2396 | ||
2a75de0c | 2397 | #ifdef CONFIG_SYSCTL |
752d14dc | 2398 | tbl = kmemdup(tbl, sizeof(ctl_forward_entry), GFP_KERNEL); |
51456b29 | 2399 | if (!tbl) |
752d14dc PE |
2400 | goto err_alloc_ctl; |
2401 | ||
02291680 | 2402 | tbl[0].data = &all->data[IPV4_DEVCONF_FORWARDING - 1]; |
752d14dc PE |
2403 | tbl[0].extra1 = all; |
2404 | tbl[0].extra2 = net; | |
2a75de0c | 2405 | #endif |
752d14dc PE |
2406 | } |
2407 | ||
2408 | #ifdef CONFIG_SYSCTL | |
29c994e3 | 2409 | err = __devinet_sysctl_register(net, "all", NETCONFA_IFINDEX_ALL, all); |
752d14dc PE |
2410 | if (err < 0) |
2411 | goto err_reg_all; | |
2412 | ||
29c994e3 ND |
2413 | err = __devinet_sysctl_register(net, "default", |
2414 | NETCONFA_IFINDEX_DEFAULT, dflt); | |
752d14dc PE |
2415 | if (err < 0) |
2416 | goto err_reg_dflt; | |
2417 | ||
2418 | err = -ENOMEM; | |
8607ddb8 | 2419 | forw_hdr = register_net_sysctl(net, "net/ipv4", tbl); |
51456b29 | 2420 | if (!forw_hdr) |
752d14dc | 2421 | goto err_reg_ctl; |
2a75de0c | 2422 | net->ipv4.forw_hdr = forw_hdr; |
752d14dc PE |
2423 | #endif |
2424 | ||
752d14dc PE |
2425 | net->ipv4.devconf_all = all; |
2426 | net->ipv4.devconf_dflt = dflt; | |
2427 | return 0; | |
2428 | ||
2429 | #ifdef CONFIG_SYSCTL | |
2430 | err_reg_ctl: | |
b5c9641d | 2431 | __devinet_sysctl_unregister(net, dflt, NETCONFA_IFINDEX_DEFAULT); |
752d14dc | 2432 | err_reg_dflt: |
b5c9641d | 2433 | __devinet_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL); |
752d14dc PE |
2434 | err_reg_all: |
2435 | if (tbl != ctl_forward_entry) | |
2436 | kfree(tbl); | |
752d14dc | 2437 | err_alloc_ctl: |
2a75de0c | 2438 | #endif |
752d14dc PE |
2439 | if (dflt != &ipv4_devconf_dflt) |
2440 | kfree(dflt); | |
2441 | err_alloc_dflt: | |
2442 | if (all != &ipv4_devconf) | |
2443 | kfree(all); | |
2444 | err_alloc_all: | |
2445 | return err; | |
2446 | } | |
2447 | ||
2448 | static __net_exit void devinet_exit_net(struct net *net) | |
2449 | { | |
2a75de0c | 2450 | #ifdef CONFIG_SYSCTL |
752d14dc PE |
2451 | struct ctl_table *tbl; |
2452 | ||
2453 | tbl = net->ipv4.forw_hdr->ctl_table_arg; | |
752d14dc | 2454 | unregister_net_sysctl_table(net->ipv4.forw_hdr); |
b5c9641d DA |
2455 | __devinet_sysctl_unregister(net, net->ipv4.devconf_dflt, |
2456 | NETCONFA_IFINDEX_DEFAULT); | |
2457 | __devinet_sysctl_unregister(net, net->ipv4.devconf_all, | |
2458 | NETCONFA_IFINDEX_ALL); | |
752d14dc | 2459 | kfree(tbl); |
2a75de0c | 2460 | #endif |
752d14dc PE |
2461 | kfree(net->ipv4.devconf_dflt); |
2462 | kfree(net->ipv4.devconf_all); | |
2463 | } | |
2464 | ||
2465 | static __net_initdata struct pernet_operations devinet_ops = { | |
2466 | .init = devinet_init_net, | |
2467 | .exit = devinet_exit_net, | |
2468 | }; | |
2469 | ||
207895fd | 2470 | static struct rtnl_af_ops inet_af_ops __read_mostly = { |
9f0f7272 TG |
2471 | .family = AF_INET, |
2472 | .fill_link_af = inet_fill_link_af, | |
2473 | .get_link_af_size = inet_get_link_af_size, | |
cf7afbfe TG |
2474 | .validate_link_af = inet_validate_link_af, |
2475 | .set_link_af = inet_set_link_af, | |
9f0f7272 TG |
2476 | }; |
2477 | ||
1da177e4 LT |
2478 | void __init devinet_init(void) |
2479 | { | |
fd23c3b3 DM |
2480 | int i; |
2481 | ||
2482 | for (i = 0; i < IN4_ADDR_HSIZE; i++) | |
2483 | INIT_HLIST_HEAD(&inet_addr_lst[i]); | |
2484 | ||
752d14dc PE |
2485 | register_pernet_subsys(&devinet_ops); |
2486 | ||
1da177e4 LT |
2487 | register_gifconf(PF_INET, inet_gifconf); |
2488 | register_netdevice_notifier(&ip_netdev_notifier); | |
63f3444f | 2489 | |
906e073f | 2490 | queue_delayed_work(system_power_efficient_wq, &check_lifetime_work, 0); |
5c766d64 | 2491 | |
9f0f7272 TG |
2492 | rtnl_af_register(&inet_af_ops); |
2493 | ||
c7ac8679 GR |
2494 | rtnl_register(PF_INET, RTM_NEWADDR, inet_rtm_newaddr, NULL, NULL); |
2495 | rtnl_register(PF_INET, RTM_DELADDR, inet_rtm_deladdr, NULL, NULL); | |
2496 | rtnl_register(PF_INET, RTM_GETADDR, NULL, inet_dump_ifaddr, NULL); | |
9e551110 | 2497 | rtnl_register(PF_INET, RTM_GETNETCONF, inet_netconf_get_devconf, |
7a674200 | 2498 | inet_netconf_dump_devconf, NULL); |
1da177e4 | 2499 | } |