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 | { | |
9435eb1c DM |
140 | struct net_device *result = NULL; |
141 | struct in_ifaddr *ifa; | |
9435eb1c DM |
142 | |
143 | rcu_read_lock(); | |
6e617de8 PA |
144 | ifa = inet_lookup_ifaddr_rcu(net, addr); |
145 | if (!ifa) { | |
406b6f97 DM |
146 | struct flowi4 fl4 = { .daddr = addr }; |
147 | struct fib_result res = { 0 }; | |
148 | struct fib_table *local; | |
149 | ||
150 | /* Fallback to FIB local table so that communication | |
151 | * over loopback subnets work. | |
152 | */ | |
153 | local = fib_get_table(net, RT_TABLE_LOCAL); | |
154 | if (local && | |
155 | !fib_table_lookup(local, &fl4, &res, FIB_LOOKUP_NOREF) && | |
156 | res.type == RTN_LOCAL) | |
157 | result = FIB_RES_DEV(res); | |
6e617de8 PA |
158 | } else { |
159 | result = ifa->ifa_dev->dev; | |
406b6f97 | 160 | } |
9435eb1c DM |
161 | if (result && devref) |
162 | dev_hold(result); | |
163 | rcu_read_unlock(); | |
164 | return result; | |
165 | } | |
166 | EXPORT_SYMBOL(__ip_dev_find); | |
167 | ||
6e617de8 PA |
168 | /* called under RCU lock */ |
169 | struct in_ifaddr *inet_lookup_ifaddr_rcu(struct net *net, __be32 addr) | |
170 | { | |
171 | u32 hash = inet_addr_hash(net, addr); | |
172 | struct in_ifaddr *ifa; | |
173 | ||
174 | hlist_for_each_entry_rcu(ifa, &inet_addr_lst[hash], hash) | |
175 | if (ifa->ifa_local == addr && | |
176 | net_eq(dev_net(ifa->ifa_dev->dev), net)) | |
177 | return ifa; | |
178 | ||
179 | return NULL; | |
180 | } | |
181 | ||
d6062cbb | 182 | static void rtmsg_ifa(int event, struct in_ifaddr *, struct nlmsghdr *, u32); |
1da177e4 | 183 | |
e041c683 | 184 | static BLOCKING_NOTIFIER_HEAD(inetaddr_chain); |
3ad7d246 | 185 | static BLOCKING_NOTIFIER_HEAD(inetaddr_validator_chain); |
1da177e4 LT |
186 | static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap, |
187 | int destroy); | |
188 | #ifdef CONFIG_SYSCTL | |
20e61da7 | 189 | static int devinet_sysctl_register(struct in_device *idev); |
51602b2a PE |
190 | static void devinet_sysctl_unregister(struct in_device *idev); |
191 | #else | |
20e61da7 | 192 | static int devinet_sysctl_register(struct in_device *idev) |
51602b2a | 193 | { |
20e61da7 | 194 | return 0; |
51602b2a | 195 | } |
40384999 | 196 | static void devinet_sysctl_unregister(struct in_device *idev) |
51602b2a PE |
197 | { |
198 | } | |
1da177e4 LT |
199 | #endif |
200 | ||
201 | /* Locks all the inet devices. */ | |
202 | ||
203 | static struct in_ifaddr *inet_alloc_ifa(void) | |
204 | { | |
93adcc80 | 205 | return kzalloc(sizeof(struct in_ifaddr), GFP_KERNEL); |
1da177e4 LT |
206 | } |
207 | ||
208 | static void inet_rcu_free_ifa(struct rcu_head *head) | |
209 | { | |
210 | struct in_ifaddr *ifa = container_of(head, struct in_ifaddr, rcu_head); | |
211 | if (ifa->ifa_dev) | |
212 | in_dev_put(ifa->ifa_dev); | |
213 | kfree(ifa); | |
214 | } | |
215 | ||
40384999 | 216 | static void inet_free_ifa(struct in_ifaddr *ifa) |
1da177e4 LT |
217 | { |
218 | call_rcu(&ifa->rcu_head, inet_rcu_free_ifa); | |
219 | } | |
220 | ||
221 | void in_dev_finish_destroy(struct in_device *idev) | |
222 | { | |
223 | struct net_device *dev = idev->dev; | |
224 | ||
547b792c IJ |
225 | WARN_ON(idev->ifa_list); |
226 | WARN_ON(idev->mc_list); | |
e9897071 | 227 | kfree(rcu_dereference_protected(idev->mc_hash, 1)); |
1da177e4 | 228 | #ifdef NET_REFCNT_DEBUG |
91df42be | 229 | pr_debug("%s: %p=%s\n", __func__, idev, dev ? dev->name : "NIL"); |
1da177e4 LT |
230 | #endif |
231 | dev_put(dev); | |
232 | if (!idev->dead) | |
9f9354b9 ED |
233 | pr_err("Freeing alive in_device %p\n", idev); |
234 | else | |
1da177e4 | 235 | kfree(idev); |
1da177e4 | 236 | } |
9f9354b9 | 237 | EXPORT_SYMBOL(in_dev_finish_destroy); |
1da177e4 | 238 | |
71e27da9 | 239 | static struct in_device *inetdev_init(struct net_device *dev) |
1da177e4 LT |
240 | { |
241 | struct in_device *in_dev; | |
20e61da7 | 242 | int err = -ENOMEM; |
1da177e4 LT |
243 | |
244 | ASSERT_RTNL(); | |
245 | ||
0da974f4 | 246 | in_dev = kzalloc(sizeof(*in_dev), GFP_KERNEL); |
1da177e4 LT |
247 | if (!in_dev) |
248 | goto out; | |
c346dca1 | 249 | memcpy(&in_dev->cnf, dev_net(dev)->ipv4.devconf_dflt, |
9355bbd6 | 250 | sizeof(in_dev->cnf)); |
1da177e4 LT |
251 | in_dev->cnf.sysctl = NULL; |
252 | in_dev->dev = dev; | |
9f9354b9 ED |
253 | in_dev->arp_parms = neigh_parms_alloc(dev, &arp_tbl); |
254 | if (!in_dev->arp_parms) | |
1da177e4 | 255 | goto out_kfree; |
0187bdfb BH |
256 | if (IPV4_DEVCONF(in_dev->cnf, FORWARDING)) |
257 | dev_disable_lro(dev); | |
1da177e4 LT |
258 | /* Reference in_dev->dev */ |
259 | dev_hold(dev); | |
30c4cf57 | 260 | /* Account for reference dev->ip_ptr (below) */ |
7658b36f | 261 | refcount_set(&in_dev->refcnt, 1); |
1da177e4 | 262 | |
20e61da7 WC |
263 | err = devinet_sysctl_register(in_dev); |
264 | if (err) { | |
265 | in_dev->dead = 1; | |
266 | in_dev_put(in_dev); | |
267 | in_dev = NULL; | |
268 | goto out; | |
269 | } | |
1da177e4 LT |
270 | ip_mc_init_dev(in_dev); |
271 | if (dev->flags & IFF_UP) | |
272 | ip_mc_up(in_dev); | |
483479ec | 273 | |
30c4cf57 | 274 | /* we can receive as soon as ip_ptr is set -- do this last */ |
cf778b00 | 275 | rcu_assign_pointer(dev->ip_ptr, in_dev); |
483479ec | 276 | out: |
20e61da7 | 277 | return in_dev ?: ERR_PTR(err); |
1da177e4 LT |
278 | out_kfree: |
279 | kfree(in_dev); | |
280 | in_dev = NULL; | |
281 | goto out; | |
282 | } | |
283 | ||
284 | static void in_dev_rcu_put(struct rcu_head *head) | |
285 | { | |
286 | struct in_device *idev = container_of(head, struct in_device, rcu_head); | |
287 | in_dev_put(idev); | |
288 | } | |
289 | ||
290 | static void inetdev_destroy(struct in_device *in_dev) | |
291 | { | |
292 | struct in_ifaddr *ifa; | |
293 | struct net_device *dev; | |
294 | ||
295 | ASSERT_RTNL(); | |
296 | ||
297 | dev = in_dev->dev; | |
1da177e4 LT |
298 | |
299 | in_dev->dead = 1; | |
300 | ||
301 | ip_mc_destroy_dev(in_dev); | |
302 | ||
303 | while ((ifa = in_dev->ifa_list) != NULL) { | |
304 | inet_del_ifa(in_dev, &in_dev->ifa_list, 0); | |
305 | inet_free_ifa(ifa); | |
306 | } | |
307 | ||
a9b3cd7f | 308 | RCU_INIT_POINTER(dev->ip_ptr, NULL); |
1da177e4 | 309 | |
51602b2a | 310 | devinet_sysctl_unregister(in_dev); |
1da177e4 LT |
311 | neigh_parms_release(&arp_tbl, in_dev->arp_parms); |
312 | arp_ifdown(dev); | |
313 | ||
314 | call_rcu(&in_dev->rcu_head, in_dev_rcu_put); | |
315 | } | |
316 | ||
ff428d72 | 317 | int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b) |
1da177e4 LT |
318 | { |
319 | rcu_read_lock(); | |
320 | for_primary_ifa(in_dev) { | |
321 | if (inet_ifa_match(a, ifa)) { | |
322 | if (!b || inet_ifa_match(b, ifa)) { | |
323 | rcu_read_unlock(); | |
324 | return 1; | |
325 | } | |
326 | } | |
327 | } endfor_ifa(in_dev); | |
328 | rcu_read_unlock(); | |
329 | return 0; | |
330 | } | |
331 | ||
d6062cbb | 332 | static void __inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap, |
15e47304 | 333 | int destroy, struct nlmsghdr *nlh, u32 portid) |
1da177e4 | 334 | { |
8f937c60 | 335 | struct in_ifaddr *promote = NULL; |
0ff60a45 JHS |
336 | struct in_ifaddr *ifa, *ifa1 = *ifap; |
337 | struct in_ifaddr *last_prim = in_dev->ifa_list; | |
338 | struct in_ifaddr *prev_prom = NULL; | |
339 | int do_promote = IN_DEV_PROMOTE_SECONDARIES(in_dev); | |
1da177e4 LT |
340 | |
341 | ASSERT_RTNL(); | |
342 | ||
fbd40ea0 DM |
343 | if (in_dev->dead) |
344 | goto no_promotions; | |
345 | ||
e905a9ed | 346 | /* 1. Deleting primary ifaddr forces deletion all secondaries |
8f937c60 HW |
347 | * unless alias promotion is set |
348 | **/ | |
1da177e4 LT |
349 | |
350 | if (!(ifa1->ifa_flags & IFA_F_SECONDARY)) { | |
1da177e4 LT |
351 | struct in_ifaddr **ifap1 = &ifa1->ifa_next; |
352 | ||
353 | while ((ifa = *ifap1) != NULL) { | |
e905a9ed | 354 | if (!(ifa->ifa_flags & IFA_F_SECONDARY) && |
0ff60a45 JHS |
355 | ifa1->ifa_scope <= ifa->ifa_scope) |
356 | last_prim = ifa; | |
357 | ||
1da177e4 LT |
358 | if (!(ifa->ifa_flags & IFA_F_SECONDARY) || |
359 | ifa1->ifa_mask != ifa->ifa_mask || | |
360 | !inet_ifa_match(ifa1->ifa_address, ifa)) { | |
361 | ifap1 = &ifa->ifa_next; | |
0ff60a45 | 362 | prev_prom = ifa; |
1da177e4 LT |
363 | continue; |
364 | } | |
365 | ||
0ff60a45 | 366 | if (!do_promote) { |
fd23c3b3 | 367 | inet_hash_remove(ifa); |
8f937c60 | 368 | *ifap1 = ifa->ifa_next; |
1da177e4 | 369 | |
15e47304 | 370 | rtmsg_ifa(RTM_DELADDR, ifa, nlh, portid); |
e041c683 AS |
371 | blocking_notifier_call_chain(&inetaddr_chain, |
372 | NETDEV_DOWN, ifa); | |
8f937c60 HW |
373 | inet_free_ifa(ifa); |
374 | } else { | |
375 | promote = ifa; | |
376 | break; | |
377 | } | |
1da177e4 LT |
378 | } |
379 | } | |
380 | ||
2d230e2b JA |
381 | /* On promotion all secondaries from subnet are changing |
382 | * the primary IP, we must remove all their routes silently | |
383 | * and later to add them back with new prefsrc. Do this | |
384 | * while all addresses are on the device list. | |
385 | */ | |
386 | for (ifa = promote; ifa; ifa = ifa->ifa_next) { | |
387 | if (ifa1->ifa_mask == ifa->ifa_mask && | |
388 | inet_ifa_match(ifa1->ifa_address, ifa)) | |
389 | fib_del_ifaddr(ifa, ifa1); | |
390 | } | |
391 | ||
fbd40ea0 | 392 | no_promotions: |
1da177e4 LT |
393 | /* 2. Unlink it */ |
394 | ||
395 | *ifap = ifa1->ifa_next; | |
fd23c3b3 | 396 | inet_hash_remove(ifa1); |
1da177e4 LT |
397 | |
398 | /* 3. Announce address deletion */ | |
399 | ||
400 | /* Send message first, then call notifier. | |
401 | At first sight, FIB update triggered by notifier | |
402 | will refer to already deleted ifaddr, that could confuse | |
403 | netlink listeners. It is not true: look, gated sees | |
404 | that route deleted and if it still thinks that ifaddr | |
405 | is valid, it will try to restore deleted routes... Grr. | |
406 | So that, this order is correct. | |
407 | */ | |
15e47304 | 408 | rtmsg_ifa(RTM_DELADDR, ifa1, nlh, portid); |
e041c683 | 409 | blocking_notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa1); |
1da177e4 | 410 | |
0ff60a45 | 411 | if (promote) { |
04024b93 | 412 | struct in_ifaddr *next_sec = promote->ifa_next; |
0ff60a45 JHS |
413 | |
414 | if (prev_prom) { | |
415 | prev_prom->ifa_next = promote->ifa_next; | |
416 | promote->ifa_next = last_prim->ifa_next; | |
417 | last_prim->ifa_next = promote; | |
418 | } | |
8f937c60 | 419 | |
8f937c60 | 420 | promote->ifa_flags &= ~IFA_F_SECONDARY; |
15e47304 | 421 | rtmsg_ifa(RTM_NEWADDR, promote, nlh, portid); |
e041c683 AS |
422 | blocking_notifier_call_chain(&inetaddr_chain, |
423 | NETDEV_UP, promote); | |
04024b93 | 424 | for (ifa = next_sec; ifa; ifa = ifa->ifa_next) { |
0ff60a45 JHS |
425 | if (ifa1->ifa_mask != ifa->ifa_mask || |
426 | !inet_ifa_match(ifa1->ifa_address, ifa)) | |
427 | continue; | |
428 | fib_add_ifaddr(ifa); | |
429 | } | |
430 | ||
431 | } | |
6363097c | 432 | if (destroy) |
0ff60a45 | 433 | inet_free_ifa(ifa1); |
1da177e4 LT |
434 | } |
435 | ||
d6062cbb TG |
436 | static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap, |
437 | int destroy) | |
438 | { | |
439 | __inet_del_ifa(in_dev, ifap, destroy, NULL, 0); | |
440 | } | |
441 | ||
5c766d64 JP |
442 | static void check_lifetime(struct work_struct *work); |
443 | ||
444 | static DECLARE_DELAYED_WORK(check_lifetime_work, check_lifetime); | |
445 | ||
d6062cbb | 446 | static int __inet_insert_ifa(struct in_ifaddr *ifa, struct nlmsghdr *nlh, |
15e47304 | 447 | u32 portid) |
1da177e4 LT |
448 | { |
449 | struct in_device *in_dev = ifa->ifa_dev; | |
450 | struct in_ifaddr *ifa1, **ifap, **last_primary; | |
3ad7d246 KJ |
451 | struct in_validator_info ivi; |
452 | int ret; | |
1da177e4 LT |
453 | |
454 | ASSERT_RTNL(); | |
455 | ||
456 | if (!ifa->ifa_local) { | |
457 | inet_free_ifa(ifa); | |
458 | return 0; | |
459 | } | |
460 | ||
461 | ifa->ifa_flags &= ~IFA_F_SECONDARY; | |
462 | last_primary = &in_dev->ifa_list; | |
463 | ||
464 | for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL; | |
465 | ifap = &ifa1->ifa_next) { | |
466 | if (!(ifa1->ifa_flags & IFA_F_SECONDARY) && | |
467 | ifa->ifa_scope <= ifa1->ifa_scope) | |
468 | last_primary = &ifa1->ifa_next; | |
469 | if (ifa1->ifa_mask == ifa->ifa_mask && | |
470 | inet_ifa_match(ifa1->ifa_address, ifa)) { | |
471 | if (ifa1->ifa_local == ifa->ifa_local) { | |
472 | inet_free_ifa(ifa); | |
473 | return -EEXIST; | |
474 | } | |
475 | if (ifa1->ifa_scope != ifa->ifa_scope) { | |
476 | inet_free_ifa(ifa); | |
477 | return -EINVAL; | |
478 | } | |
479 | ifa->ifa_flags |= IFA_F_SECONDARY; | |
480 | } | |
481 | } | |
482 | ||
3ad7d246 KJ |
483 | /* Allow any devices that wish to register ifaddr validtors to weigh |
484 | * in now, before changes are committed. The rntl lock is serializing | |
485 | * access here, so the state should not change between a validator call | |
486 | * and a final notify on commit. This isn't invoked on promotion under | |
487 | * the assumption that validators are checking the address itself, and | |
488 | * not the flags. | |
489 | */ | |
490 | ivi.ivi_addr = ifa->ifa_address; | |
491 | ivi.ivi_dev = ifa->ifa_dev; | |
492 | ret = blocking_notifier_call_chain(&inetaddr_validator_chain, | |
493 | NETDEV_UP, &ivi); | |
494 | ret = notifier_to_errno(ret); | |
495 | if (ret) { | |
496 | inet_free_ifa(ifa); | |
497 | return ret; | |
498 | } | |
499 | ||
1da177e4 | 500 | if (!(ifa->ifa_flags & IFA_F_SECONDARY)) { |
63862b5b | 501 | prandom_seed((__force u32) ifa->ifa_local); |
1da177e4 LT |
502 | ifap = last_primary; |
503 | } | |
504 | ||
505 | ifa->ifa_next = *ifap; | |
506 | *ifap = ifa; | |
507 | ||
fd23c3b3 DM |
508 | inet_hash_insert(dev_net(in_dev->dev), ifa); |
509 | ||
5c766d64 | 510 | cancel_delayed_work(&check_lifetime_work); |
906e073f | 511 | queue_delayed_work(system_power_efficient_wq, &check_lifetime_work, 0); |
5c766d64 | 512 | |
1da177e4 LT |
513 | /* Send message first, then call notifier. |
514 | Notifier will trigger FIB update, so that | |
515 | listeners of netlink will know about new ifaddr */ | |
15e47304 | 516 | rtmsg_ifa(RTM_NEWADDR, ifa, nlh, portid); |
e041c683 | 517 | blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa); |
1da177e4 LT |
518 | |
519 | return 0; | |
520 | } | |
521 | ||
d6062cbb TG |
522 | static int inet_insert_ifa(struct in_ifaddr *ifa) |
523 | { | |
524 | return __inet_insert_ifa(ifa, NULL, 0); | |
525 | } | |
526 | ||
1da177e4 LT |
527 | static int inet_set_ifa(struct net_device *dev, struct in_ifaddr *ifa) |
528 | { | |
e5ed6399 | 529 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
1da177e4 LT |
530 | |
531 | ASSERT_RTNL(); | |
532 | ||
533 | if (!in_dev) { | |
71e27da9 HX |
534 | inet_free_ifa(ifa); |
535 | return -ENOBUFS; | |
1da177e4 | 536 | } |
71e27da9 | 537 | ipv4_devconf_setall(in_dev); |
1d4c8c29 | 538 | neigh_parms_data_state_setall(in_dev->arp_parms); |
1da177e4 | 539 | if (ifa->ifa_dev != in_dev) { |
547b792c | 540 | WARN_ON(ifa->ifa_dev); |
1da177e4 LT |
541 | in_dev_hold(in_dev); |
542 | ifa->ifa_dev = in_dev; | |
543 | } | |
f97c1e0c | 544 | if (ipv4_is_loopback(ifa->ifa_local)) |
1da177e4 LT |
545 | ifa->ifa_scope = RT_SCOPE_HOST; |
546 | return inet_insert_ifa(ifa); | |
547 | } | |
548 | ||
8723e1b4 ED |
549 | /* Caller must hold RCU or RTNL : |
550 | * We dont take a reference on found in_device | |
551 | */ | |
7fee0ca2 | 552 | struct in_device *inetdev_by_index(struct net *net, int ifindex) |
1da177e4 LT |
553 | { |
554 | struct net_device *dev; | |
555 | struct in_device *in_dev = NULL; | |
c148fc2e ED |
556 | |
557 | rcu_read_lock(); | |
558 | dev = dev_get_by_index_rcu(net, ifindex); | |
1da177e4 | 559 | if (dev) |
8723e1b4 | 560 | in_dev = rcu_dereference_rtnl(dev->ip_ptr); |
c148fc2e | 561 | rcu_read_unlock(); |
1da177e4 LT |
562 | return in_dev; |
563 | } | |
9f9354b9 | 564 | EXPORT_SYMBOL(inetdev_by_index); |
1da177e4 LT |
565 | |
566 | /* Called only from RTNL semaphored context. No locks. */ | |
567 | ||
60cad5da AV |
568 | struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix, |
569 | __be32 mask) | |
1da177e4 LT |
570 | { |
571 | ASSERT_RTNL(); | |
572 | ||
573 | for_primary_ifa(in_dev) { | |
574 | if (ifa->ifa_mask == mask && inet_ifa_match(prefix, ifa)) | |
575 | return ifa; | |
576 | } endfor_ifa(in_dev); | |
577 | return NULL; | |
578 | } | |
579 | ||
93a714d6 MC |
580 | static int ip_mc_config(struct sock *sk, bool join, const struct in_ifaddr *ifa) |
581 | { | |
582 | struct ip_mreqn mreq = { | |
583 | .imr_multiaddr.s_addr = ifa->ifa_address, | |
584 | .imr_ifindex = ifa->ifa_dev->dev->ifindex, | |
585 | }; | |
586 | int ret; | |
587 | ||
588 | ASSERT_RTNL(); | |
589 | ||
590 | lock_sock(sk); | |
591 | if (join) | |
54ff9ef3 | 592 | ret = ip_mc_join_group(sk, &mreq); |
93a714d6 | 593 | else |
54ff9ef3 | 594 | ret = ip_mc_leave_group(sk, &mreq); |
93a714d6 MC |
595 | release_sock(sk); |
596 | ||
597 | return ret; | |
598 | } | |
599 | ||
c21ef3e3 DA |
600 | static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, |
601 | struct netlink_ext_ack *extack) | |
1da177e4 | 602 | { |
3b1e0a65 | 603 | struct net *net = sock_net(skb->sk); |
dfdd5fd4 | 604 | struct nlattr *tb[IFA_MAX+1]; |
1da177e4 | 605 | struct in_device *in_dev; |
dfdd5fd4 | 606 | struct ifaddrmsg *ifm; |
1da177e4 | 607 | struct in_ifaddr *ifa, **ifap; |
dfdd5fd4 | 608 | int err = -EINVAL; |
1da177e4 LT |
609 | |
610 | ASSERT_RTNL(); | |
611 | ||
fceb6435 | 612 | err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy, |
c21ef3e3 | 613 | extack); |
dfdd5fd4 TG |
614 | if (err < 0) |
615 | goto errout; | |
616 | ||
617 | ifm = nlmsg_data(nlh); | |
7fee0ca2 | 618 | in_dev = inetdev_by_index(net, ifm->ifa_index); |
51456b29 | 619 | if (!in_dev) { |
dfdd5fd4 TG |
620 | err = -ENODEV; |
621 | goto errout; | |
622 | } | |
623 | ||
1da177e4 LT |
624 | for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; |
625 | ifap = &ifa->ifa_next) { | |
dfdd5fd4 | 626 | if (tb[IFA_LOCAL] && |
67b61f6c | 627 | ifa->ifa_local != nla_get_in_addr(tb[IFA_LOCAL])) |
dfdd5fd4 TG |
628 | continue; |
629 | ||
630 | if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label)) | |
1da177e4 | 631 | continue; |
dfdd5fd4 TG |
632 | |
633 | if (tb[IFA_ADDRESS] && | |
634 | (ifm->ifa_prefixlen != ifa->ifa_prefixlen || | |
67b61f6c | 635 | !inet_ifa_match(nla_get_in_addr(tb[IFA_ADDRESS]), ifa))) |
dfdd5fd4 TG |
636 | continue; |
637 | ||
93a714d6 MC |
638 | if (ipv4_is_multicast(ifa->ifa_address)) |
639 | ip_mc_config(net->ipv4.mc_autojoin_sk, false, ifa); | |
15e47304 | 640 | __inet_del_ifa(in_dev, ifap, 1, nlh, NETLINK_CB(skb).portid); |
1da177e4 LT |
641 | return 0; |
642 | } | |
dfdd5fd4 TG |
643 | |
644 | err = -EADDRNOTAVAIL; | |
645 | errout: | |
646 | return err; | |
1da177e4 LT |
647 | } |
648 | ||
5c766d64 JP |
649 | #define INFINITY_LIFE_TIME 0xFFFFFFFF |
650 | ||
651 | static void check_lifetime(struct work_struct *work) | |
652 | { | |
653 | unsigned long now, next, next_sec, next_sched; | |
654 | struct in_ifaddr *ifa; | |
c988d1e8 | 655 | struct hlist_node *n; |
5c766d64 JP |
656 | int i; |
657 | ||
658 | now = jiffies; | |
659 | next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); | |
660 | ||
5c766d64 | 661 | for (i = 0; i < IN4_ADDR_HSIZE; i++) { |
c988d1e8 JP |
662 | bool change_needed = false; |
663 | ||
664 | rcu_read_lock(); | |
b67bfe0d | 665 | hlist_for_each_entry_rcu(ifa, &inet_addr_lst[i], hash) { |
5c766d64 JP |
666 | unsigned long age; |
667 | ||
668 | if (ifa->ifa_flags & IFA_F_PERMANENT) | |
669 | continue; | |
670 | ||
671 | /* We try to batch several events at once. */ | |
672 | age = (now - ifa->ifa_tstamp + | |
673 | ADDRCONF_TIMER_FUZZ_MINUS) / HZ; | |
674 | ||
675 | if (ifa->ifa_valid_lft != INFINITY_LIFE_TIME && | |
676 | age >= ifa->ifa_valid_lft) { | |
c988d1e8 | 677 | change_needed = true; |
5c766d64 JP |
678 | } else if (ifa->ifa_preferred_lft == |
679 | INFINITY_LIFE_TIME) { | |
680 | continue; | |
681 | } else if (age >= ifa->ifa_preferred_lft) { | |
682 | if (time_before(ifa->ifa_tstamp + | |
683 | ifa->ifa_valid_lft * HZ, next)) | |
684 | next = ifa->ifa_tstamp + | |
685 | ifa->ifa_valid_lft * HZ; | |
686 | ||
c988d1e8 JP |
687 | if (!(ifa->ifa_flags & IFA_F_DEPRECATED)) |
688 | change_needed = true; | |
5c766d64 JP |
689 | } else if (time_before(ifa->ifa_tstamp + |
690 | ifa->ifa_preferred_lft * HZ, | |
691 | next)) { | |
692 | next = ifa->ifa_tstamp + | |
693 | ifa->ifa_preferred_lft * HZ; | |
694 | } | |
695 | } | |
c988d1e8 JP |
696 | rcu_read_unlock(); |
697 | if (!change_needed) | |
698 | continue; | |
699 | rtnl_lock(); | |
700 | hlist_for_each_entry_safe(ifa, n, &inet_addr_lst[i], hash) { | |
701 | unsigned long age; | |
702 | ||
703 | if (ifa->ifa_flags & IFA_F_PERMANENT) | |
704 | continue; | |
705 | ||
706 | /* We try to batch several events at once. */ | |
707 | age = (now - ifa->ifa_tstamp + | |
708 | ADDRCONF_TIMER_FUZZ_MINUS) / HZ; | |
709 | ||
710 | if (ifa->ifa_valid_lft != INFINITY_LIFE_TIME && | |
711 | age >= ifa->ifa_valid_lft) { | |
712 | struct in_ifaddr **ifap; | |
713 | ||
714 | for (ifap = &ifa->ifa_dev->ifa_list; | |
715 | *ifap != NULL; ifap = &(*ifap)->ifa_next) { | |
716 | if (*ifap == ifa) { | |
717 | inet_del_ifa(ifa->ifa_dev, | |
718 | ifap, 1); | |
719 | break; | |
720 | } | |
721 | } | |
722 | } else if (ifa->ifa_preferred_lft != | |
723 | INFINITY_LIFE_TIME && | |
724 | age >= ifa->ifa_preferred_lft && | |
725 | !(ifa->ifa_flags & IFA_F_DEPRECATED)) { | |
726 | ifa->ifa_flags |= IFA_F_DEPRECATED; | |
727 | rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0); | |
728 | } | |
729 | } | |
730 | rtnl_unlock(); | |
5c766d64 | 731 | } |
5c766d64 JP |
732 | |
733 | next_sec = round_jiffies_up(next); | |
734 | next_sched = next; | |
735 | ||
736 | /* If rounded timeout is accurate enough, accept it. */ | |
737 | if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) | |
738 | next_sched = next_sec; | |
739 | ||
740 | now = jiffies; | |
741 | /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ | |
742 | if (time_before(next_sched, now + ADDRCONF_TIMER_FUZZ_MAX)) | |
743 | next_sched = now + ADDRCONF_TIMER_FUZZ_MAX; | |
744 | ||
906e073f | 745 | queue_delayed_work(system_power_efficient_wq, &check_lifetime_work, |
746 | next_sched - now); | |
5c766d64 JP |
747 | } |
748 | ||
749 | static void set_ifa_lifetime(struct in_ifaddr *ifa, __u32 valid_lft, | |
750 | __u32 prefered_lft) | |
751 | { | |
752 | unsigned long timeout; | |
753 | ||
754 | ifa->ifa_flags &= ~(IFA_F_PERMANENT | IFA_F_DEPRECATED); | |
755 | ||
756 | timeout = addrconf_timeout_fixup(valid_lft, HZ); | |
757 | if (addrconf_finite_timeout(timeout)) | |
758 | ifa->ifa_valid_lft = timeout; | |
759 | else | |
760 | ifa->ifa_flags |= IFA_F_PERMANENT; | |
761 | ||
762 | timeout = addrconf_timeout_fixup(prefered_lft, HZ); | |
763 | if (addrconf_finite_timeout(timeout)) { | |
764 | if (timeout == 0) | |
765 | ifa->ifa_flags |= IFA_F_DEPRECATED; | |
766 | ifa->ifa_preferred_lft = timeout; | |
767 | } | |
768 | ifa->ifa_tstamp = jiffies; | |
769 | if (!ifa->ifa_cstamp) | |
770 | ifa->ifa_cstamp = ifa->ifa_tstamp; | |
771 | } | |
772 | ||
773 | static struct in_ifaddr *rtm_to_ifaddr(struct net *net, struct nlmsghdr *nlh, | |
774 | __u32 *pvalid_lft, __u32 *pprefered_lft) | |
1da177e4 | 775 | { |
5c753978 TG |
776 | struct nlattr *tb[IFA_MAX+1]; |
777 | struct in_ifaddr *ifa; | |
778 | struct ifaddrmsg *ifm; | |
1da177e4 LT |
779 | struct net_device *dev; |
780 | struct in_device *in_dev; | |
7b218574 | 781 | int err; |
1da177e4 | 782 | |
fceb6435 JB |
783 | err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy, |
784 | NULL); | |
5c753978 TG |
785 | if (err < 0) |
786 | goto errout; | |
1da177e4 | 787 | |
5c753978 | 788 | ifm = nlmsg_data(nlh); |
7b218574 | 789 | err = -EINVAL; |
51456b29 | 790 | if (ifm->ifa_prefixlen > 32 || !tb[IFA_LOCAL]) |
5c753978 | 791 | goto errout; |
1da177e4 | 792 | |
4b8aa9ab | 793 | dev = __dev_get_by_index(net, ifm->ifa_index); |
7b218574 | 794 | err = -ENODEV; |
51456b29 | 795 | if (!dev) |
5c753978 | 796 | goto errout; |
1da177e4 | 797 | |
5c753978 | 798 | in_dev = __in_dev_get_rtnl(dev); |
7b218574 | 799 | err = -ENOBUFS; |
51456b29 | 800 | if (!in_dev) |
71e27da9 | 801 | goto errout; |
1da177e4 | 802 | |
5c753978 | 803 | ifa = inet_alloc_ifa(); |
51456b29 | 804 | if (!ifa) |
5c753978 TG |
805 | /* |
806 | * A potential indev allocation can be left alive, it stays | |
807 | * assigned to its device and is destroy with it. | |
808 | */ | |
5c753978 | 809 | goto errout; |
5c753978 | 810 | |
a4e65d36 | 811 | ipv4_devconf_setall(in_dev); |
1d4c8c29 | 812 | neigh_parms_data_state_setall(in_dev->arp_parms); |
5c753978 TG |
813 | in_dev_hold(in_dev); |
814 | ||
51456b29 | 815 | if (!tb[IFA_ADDRESS]) |
5c753978 | 816 | tb[IFA_ADDRESS] = tb[IFA_LOCAL]; |
1da177e4 | 817 | |
fd23c3b3 | 818 | INIT_HLIST_NODE(&ifa->hash); |
1da177e4 LT |
819 | ifa->ifa_prefixlen = ifm->ifa_prefixlen; |
820 | ifa->ifa_mask = inet_make_mask(ifm->ifa_prefixlen); | |
ad6c8135 JP |
821 | ifa->ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : |
822 | ifm->ifa_flags; | |
1da177e4 | 823 | ifa->ifa_scope = ifm->ifa_scope; |
5c753978 TG |
824 | ifa->ifa_dev = in_dev; |
825 | ||
67b61f6c JB |
826 | ifa->ifa_local = nla_get_in_addr(tb[IFA_LOCAL]); |
827 | ifa->ifa_address = nla_get_in_addr(tb[IFA_ADDRESS]); | |
5c753978 TG |
828 | |
829 | if (tb[IFA_BROADCAST]) | |
67b61f6c | 830 | ifa->ifa_broadcast = nla_get_in_addr(tb[IFA_BROADCAST]); |
5c753978 | 831 | |
5c753978 TG |
832 | if (tb[IFA_LABEL]) |
833 | nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ); | |
1da177e4 LT |
834 | else |
835 | memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); | |
836 | ||
5c766d64 JP |
837 | if (tb[IFA_CACHEINFO]) { |
838 | struct ifa_cacheinfo *ci; | |
839 | ||
840 | ci = nla_data(tb[IFA_CACHEINFO]); | |
841 | if (!ci->ifa_valid || ci->ifa_prefered > ci->ifa_valid) { | |
842 | err = -EINVAL; | |
446266b0 | 843 | goto errout_free; |
5c766d64 JP |
844 | } |
845 | *pvalid_lft = ci->ifa_valid; | |
846 | *pprefered_lft = ci->ifa_prefered; | |
847 | } | |
848 | ||
5c753978 TG |
849 | return ifa; |
850 | ||
446266b0 DB |
851 | errout_free: |
852 | inet_free_ifa(ifa); | |
5c753978 TG |
853 | errout: |
854 | return ERR_PTR(err); | |
855 | } | |
856 | ||
5c766d64 JP |
857 | static struct in_ifaddr *find_matching_ifa(struct in_ifaddr *ifa) |
858 | { | |
859 | struct in_device *in_dev = ifa->ifa_dev; | |
860 | struct in_ifaddr *ifa1, **ifap; | |
861 | ||
862 | if (!ifa->ifa_local) | |
863 | return NULL; | |
864 | ||
865 | for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL; | |
866 | ifap = &ifa1->ifa_next) { | |
867 | if (ifa1->ifa_mask == ifa->ifa_mask && | |
868 | inet_ifa_match(ifa1->ifa_address, ifa) && | |
869 | ifa1->ifa_local == ifa->ifa_local) | |
870 | return ifa1; | |
871 | } | |
872 | return NULL; | |
873 | } | |
874 | ||
c21ef3e3 DA |
875 | static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, |
876 | struct netlink_ext_ack *extack) | |
5c753978 | 877 | { |
3b1e0a65 | 878 | struct net *net = sock_net(skb->sk); |
5c753978 | 879 | struct in_ifaddr *ifa; |
5c766d64 JP |
880 | struct in_ifaddr *ifa_existing; |
881 | __u32 valid_lft = INFINITY_LIFE_TIME; | |
882 | __u32 prefered_lft = INFINITY_LIFE_TIME; | |
5c753978 TG |
883 | |
884 | ASSERT_RTNL(); | |
885 | ||
5c766d64 | 886 | ifa = rtm_to_ifaddr(net, nlh, &valid_lft, &prefered_lft); |
5c753978 TG |
887 | if (IS_ERR(ifa)) |
888 | return PTR_ERR(ifa); | |
889 | ||
5c766d64 JP |
890 | ifa_existing = find_matching_ifa(ifa); |
891 | if (!ifa_existing) { | |
892 | /* It would be best to check for !NLM_F_CREATE here but | |
614d056c | 893 | * userspace already relies on not having to provide this. |
5c766d64 JP |
894 | */ |
895 | set_ifa_lifetime(ifa, valid_lft, prefered_lft); | |
93a714d6 MC |
896 | if (ifa->ifa_flags & IFA_F_MCAUTOJOIN) { |
897 | int ret = ip_mc_config(net->ipv4.mc_autojoin_sk, | |
898 | true, ifa); | |
899 | ||
900 | if (ret < 0) { | |
901 | inet_free_ifa(ifa); | |
902 | return ret; | |
903 | } | |
904 | } | |
5c766d64 JP |
905 | return __inet_insert_ifa(ifa, nlh, NETLINK_CB(skb).portid); |
906 | } else { | |
907 | inet_free_ifa(ifa); | |
908 | ||
909 | if (nlh->nlmsg_flags & NLM_F_EXCL || | |
910 | !(nlh->nlmsg_flags & NLM_F_REPLACE)) | |
911 | return -EEXIST; | |
34e2ed34 JP |
912 | ifa = ifa_existing; |
913 | set_ifa_lifetime(ifa, valid_lft, prefered_lft); | |
05a324b9 | 914 | cancel_delayed_work(&check_lifetime_work); |
906e073f | 915 | queue_delayed_work(system_power_efficient_wq, |
916 | &check_lifetime_work, 0); | |
34e2ed34 | 917 | rtmsg_ifa(RTM_NEWADDR, ifa, nlh, NETLINK_CB(skb).portid); |
5c766d64 JP |
918 | } |
919 | return 0; | |
1da177e4 LT |
920 | } |
921 | ||
922 | /* | |
923 | * Determine a default network mask, based on the IP address. | |
924 | */ | |
925 | ||
40384999 | 926 | static int inet_abc_len(__be32 addr) |
1da177e4 LT |
927 | { |
928 | int rc = -1; /* Something else, probably a multicast. */ | |
929 | ||
f97c1e0c | 930 | if (ipv4_is_zeronet(addr)) |
e905a9ed | 931 | rc = 0; |
1da177e4 | 932 | else { |
714e85be | 933 | __u32 haddr = ntohl(addr); |
1da177e4 | 934 | |
714e85be | 935 | if (IN_CLASSA(haddr)) |
1da177e4 | 936 | rc = 8; |
714e85be | 937 | else if (IN_CLASSB(haddr)) |
1da177e4 | 938 | rc = 16; |
714e85be | 939 | else if (IN_CLASSC(haddr)) |
1da177e4 LT |
940 | rc = 24; |
941 | } | |
942 | ||
e905a9ed | 943 | return rc; |
1da177e4 LT |
944 | } |
945 | ||
946 | ||
e5b13cb1 | 947 | int devinet_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
1da177e4 LT |
948 | { |
949 | struct ifreq ifr; | |
950 | struct sockaddr_in sin_orig; | |
951 | struct sockaddr_in *sin = (struct sockaddr_in *)&ifr.ifr_addr; | |
952 | struct in_device *in_dev; | |
953 | struct in_ifaddr **ifap = NULL; | |
954 | struct in_ifaddr *ifa = NULL; | |
955 | struct net_device *dev; | |
956 | char *colon; | |
957 | int ret = -EFAULT; | |
958 | int tryaddrmatch = 0; | |
959 | ||
960 | /* | |
961 | * Fetch the caller's info block into kernel space | |
962 | */ | |
963 | ||
964 | if (copy_from_user(&ifr, arg, sizeof(struct ifreq))) | |
965 | goto out; | |
966 | ifr.ifr_name[IFNAMSIZ - 1] = 0; | |
967 | ||
968 | /* save original address for comparison */ | |
969 | memcpy(&sin_orig, sin, sizeof(*sin)); | |
970 | ||
971 | colon = strchr(ifr.ifr_name, ':'); | |
972 | if (colon) | |
973 | *colon = 0; | |
974 | ||
e5b13cb1 | 975 | dev_load(net, ifr.ifr_name); |
1da177e4 | 976 | |
132adf54 | 977 | switch (cmd) { |
1da177e4 LT |
978 | case SIOCGIFADDR: /* Get interface address */ |
979 | case SIOCGIFBRDADDR: /* Get the broadcast address */ | |
980 | case SIOCGIFDSTADDR: /* Get the destination address */ | |
981 | case SIOCGIFNETMASK: /* Get the netmask for the interface */ | |
982 | /* Note that these ioctls will not sleep, | |
983 | so that we do not impose a lock. | |
984 | One day we will be forced to put shlock here (I mean SMP) | |
985 | */ | |
986 | tryaddrmatch = (sin_orig.sin_family == AF_INET); | |
987 | memset(sin, 0, sizeof(*sin)); | |
988 | sin->sin_family = AF_INET; | |
989 | break; | |
990 | ||
991 | case SIOCSIFFLAGS: | |
bf5b30b8 | 992 | ret = -EPERM; |
52e804c6 | 993 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
994 | goto out; |
995 | break; | |
996 | case SIOCSIFADDR: /* Set interface address (and family) */ | |
997 | case SIOCSIFBRDADDR: /* Set the broadcast address */ | |
998 | case SIOCSIFDSTADDR: /* Set the destination address */ | |
999 | case SIOCSIFNETMASK: /* Set the netmask for the interface */ | |
bf5b30b8 | 1000 | ret = -EPERM; |
52e804c6 | 1001 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
1002 | goto out; |
1003 | ret = -EINVAL; | |
1004 | if (sin->sin_family != AF_INET) | |
1005 | goto out; | |
1006 | break; | |
1007 | default: | |
1008 | ret = -EINVAL; | |
1009 | goto out; | |
1010 | } | |
1011 | ||
1012 | rtnl_lock(); | |
1013 | ||
1014 | ret = -ENODEV; | |
9f9354b9 ED |
1015 | dev = __dev_get_by_name(net, ifr.ifr_name); |
1016 | if (!dev) | |
1da177e4 LT |
1017 | goto done; |
1018 | ||
1019 | if (colon) | |
1020 | *colon = ':'; | |
1021 | ||
9f9354b9 ED |
1022 | in_dev = __in_dev_get_rtnl(dev); |
1023 | if (in_dev) { | |
1da177e4 LT |
1024 | if (tryaddrmatch) { |
1025 | /* Matthias Andree */ | |
1026 | /* compare label and address (4.4BSD style) */ | |
1027 | /* note: we only do this for a limited set of ioctls | |
1028 | and only if the original address family was AF_INET. | |
1029 | This is checked above. */ | |
1030 | for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; | |
1031 | ifap = &ifa->ifa_next) { | |
1032 | if (!strcmp(ifr.ifr_name, ifa->ifa_label) && | |
1033 | sin_orig.sin_addr.s_addr == | |
6c91afe1 | 1034 | ifa->ifa_local) { |
1da177e4 LT |
1035 | break; /* found */ |
1036 | } | |
1037 | } | |
1038 | } | |
1039 | /* we didn't get a match, maybe the application is | |
1040 | 4.3BSD-style and passed in junk so we fall back to | |
1041 | comparing just the label */ | |
1042 | if (!ifa) { | |
1043 | for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; | |
1044 | ifap = &ifa->ifa_next) | |
1045 | if (!strcmp(ifr.ifr_name, ifa->ifa_label)) | |
1046 | break; | |
1047 | } | |
1048 | } | |
1049 | ||
1050 | ret = -EADDRNOTAVAIL; | |
1051 | if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS) | |
1052 | goto done; | |
1053 | ||
132adf54 | 1054 | switch (cmd) { |
1da177e4 LT |
1055 | case SIOCGIFADDR: /* Get interface address */ |
1056 | sin->sin_addr.s_addr = ifa->ifa_local; | |
1057 | goto rarok; | |
1058 | ||
1059 | case SIOCGIFBRDADDR: /* Get the broadcast address */ | |
1060 | sin->sin_addr.s_addr = ifa->ifa_broadcast; | |
1061 | goto rarok; | |
1062 | ||
1063 | case SIOCGIFDSTADDR: /* Get the destination address */ | |
1064 | sin->sin_addr.s_addr = ifa->ifa_address; | |
1065 | goto rarok; | |
1066 | ||
1067 | case SIOCGIFNETMASK: /* Get the netmask for the interface */ | |
1068 | sin->sin_addr.s_addr = ifa->ifa_mask; | |
1069 | goto rarok; | |
1070 | ||
1071 | case SIOCSIFFLAGS: | |
1072 | if (colon) { | |
1073 | ret = -EADDRNOTAVAIL; | |
1074 | if (!ifa) | |
1075 | break; | |
1076 | ret = 0; | |
1077 | if (!(ifr.ifr_flags & IFF_UP)) | |
1078 | inet_del_ifa(in_dev, ifap, 1); | |
1079 | break; | |
1080 | } | |
1081 | ret = dev_change_flags(dev, ifr.ifr_flags); | |
1082 | break; | |
1083 | ||
1084 | case SIOCSIFADDR: /* Set interface address (and family) */ | |
1085 | ret = -EINVAL; | |
1086 | if (inet_abc_len(sin->sin_addr.s_addr) < 0) | |
1087 | break; | |
1088 | ||
1089 | if (!ifa) { | |
1090 | ret = -ENOBUFS; | |
9f9354b9 ED |
1091 | ifa = inet_alloc_ifa(); |
1092 | if (!ifa) | |
1da177e4 | 1093 | break; |
c7e2e1d7 | 1094 | INIT_HLIST_NODE(&ifa->hash); |
1da177e4 LT |
1095 | if (colon) |
1096 | memcpy(ifa->ifa_label, ifr.ifr_name, IFNAMSIZ); | |
1097 | else | |
1098 | memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); | |
1099 | } else { | |
1100 | ret = 0; | |
1101 | if (ifa->ifa_local == sin->sin_addr.s_addr) | |
1102 | break; | |
1103 | inet_del_ifa(in_dev, ifap, 0); | |
1104 | ifa->ifa_broadcast = 0; | |
148f9729 | 1105 | ifa->ifa_scope = 0; |
1da177e4 LT |
1106 | } |
1107 | ||
1108 | ifa->ifa_address = ifa->ifa_local = sin->sin_addr.s_addr; | |
1109 | ||
1110 | if (!(dev->flags & IFF_POINTOPOINT)) { | |
1111 | ifa->ifa_prefixlen = inet_abc_len(ifa->ifa_address); | |
1112 | ifa->ifa_mask = inet_make_mask(ifa->ifa_prefixlen); | |
1113 | if ((dev->flags & IFF_BROADCAST) && | |
1114 | ifa->ifa_prefixlen < 31) | |
1115 | ifa->ifa_broadcast = ifa->ifa_address | | |
1116 | ~ifa->ifa_mask; | |
1117 | } else { | |
1118 | ifa->ifa_prefixlen = 32; | |
1119 | ifa->ifa_mask = inet_make_mask(32); | |
1120 | } | |
5c766d64 | 1121 | set_ifa_lifetime(ifa, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); |
1da177e4 LT |
1122 | ret = inet_set_ifa(dev, ifa); |
1123 | break; | |
1124 | ||
1125 | case SIOCSIFBRDADDR: /* Set the broadcast address */ | |
1126 | ret = 0; | |
1127 | if (ifa->ifa_broadcast != sin->sin_addr.s_addr) { | |
1128 | inet_del_ifa(in_dev, ifap, 0); | |
1129 | ifa->ifa_broadcast = sin->sin_addr.s_addr; | |
1130 | inet_insert_ifa(ifa); | |
1131 | } | |
1132 | break; | |
1133 | ||
1134 | case SIOCSIFDSTADDR: /* Set the destination address */ | |
1135 | ret = 0; | |
1136 | if (ifa->ifa_address == sin->sin_addr.s_addr) | |
1137 | break; | |
1138 | ret = -EINVAL; | |
1139 | if (inet_abc_len(sin->sin_addr.s_addr) < 0) | |
1140 | break; | |
1141 | ret = 0; | |
1142 | inet_del_ifa(in_dev, ifap, 0); | |
1143 | ifa->ifa_address = sin->sin_addr.s_addr; | |
1144 | inet_insert_ifa(ifa); | |
1145 | break; | |
1146 | ||
1147 | case SIOCSIFNETMASK: /* Set the netmask for the interface */ | |
1148 | ||
1149 | /* | |
1150 | * The mask we set must be legal. | |
1151 | */ | |
1152 | ret = -EINVAL; | |
1153 | if (bad_mask(sin->sin_addr.s_addr, 0)) | |
1154 | break; | |
1155 | ret = 0; | |
1156 | if (ifa->ifa_mask != sin->sin_addr.s_addr) { | |
a144ea4b | 1157 | __be32 old_mask = ifa->ifa_mask; |
1da177e4 LT |
1158 | inet_del_ifa(in_dev, ifap, 0); |
1159 | ifa->ifa_mask = sin->sin_addr.s_addr; | |
1160 | ifa->ifa_prefixlen = inet_mask_len(ifa->ifa_mask); | |
1161 | ||
1162 | /* See if current broadcast address matches | |
1163 | * with current netmask, then recalculate | |
1164 | * the broadcast address. Otherwise it's a | |
1165 | * funny address, so don't touch it since | |
1166 | * the user seems to know what (s)he's doing... | |
1167 | */ | |
1168 | if ((dev->flags & IFF_BROADCAST) && | |
1169 | (ifa->ifa_prefixlen < 31) && | |
1170 | (ifa->ifa_broadcast == | |
dcab5e1e | 1171 | (ifa->ifa_local|~old_mask))) { |
1da177e4 LT |
1172 | ifa->ifa_broadcast = (ifa->ifa_local | |
1173 | ~sin->sin_addr.s_addr); | |
1174 | } | |
1175 | inet_insert_ifa(ifa); | |
1176 | } | |
1177 | break; | |
1178 | } | |
1179 | done: | |
1180 | rtnl_unlock(); | |
1181 | out: | |
1182 | return ret; | |
1183 | rarok: | |
1184 | rtnl_unlock(); | |
1185 | ret = copy_to_user(arg, &ifr, sizeof(struct ifreq)) ? -EFAULT : 0; | |
1186 | goto out; | |
1187 | } | |
1188 | ||
1189 | static int inet_gifconf(struct net_device *dev, char __user *buf, int len) | |
1190 | { | |
e5ed6399 | 1191 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
1da177e4 LT |
1192 | struct in_ifaddr *ifa; |
1193 | struct ifreq ifr; | |
1194 | int done = 0; | |
1195 | ||
9f9354b9 | 1196 | if (!in_dev) |
1da177e4 LT |
1197 | goto out; |
1198 | ||
9f9354b9 | 1199 | for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { |
1da177e4 LT |
1200 | if (!buf) { |
1201 | done += sizeof(ifr); | |
1202 | continue; | |
1203 | } | |
1204 | if (len < (int) sizeof(ifr)) | |
1205 | break; | |
1206 | memset(&ifr, 0, sizeof(struct ifreq)); | |
4299c8a9 | 1207 | strcpy(ifr.ifr_name, ifa->ifa_label); |
1da177e4 LT |
1208 | |
1209 | (*(struct sockaddr_in *)&ifr.ifr_addr).sin_family = AF_INET; | |
1210 | (*(struct sockaddr_in *)&ifr.ifr_addr).sin_addr.s_addr = | |
1211 | ifa->ifa_local; | |
1212 | ||
1213 | if (copy_to_user(buf, &ifr, sizeof(struct ifreq))) { | |
1214 | done = -EFAULT; | |
1215 | break; | |
1216 | } | |
1217 | buf += sizeof(struct ifreq); | |
1218 | len -= sizeof(struct ifreq); | |
1219 | done += sizeof(struct ifreq); | |
1220 | } | |
1221 | out: | |
1222 | return done; | |
1223 | } | |
1224 | ||
8b57fd1e GF |
1225 | static __be32 in_dev_select_addr(const struct in_device *in_dev, |
1226 | int scope) | |
1227 | { | |
1228 | for_primary_ifa(in_dev) { | |
1229 | if (ifa->ifa_scope != RT_SCOPE_LINK && | |
1230 | ifa->ifa_scope <= scope) | |
1231 | return ifa->ifa_local; | |
1232 | } endfor_ifa(in_dev); | |
1233 | ||
1234 | return 0; | |
1235 | } | |
1236 | ||
a61ced5d | 1237 | __be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope) |
1da177e4 | 1238 | { |
a61ced5d | 1239 | __be32 addr = 0; |
1da177e4 | 1240 | struct in_device *in_dev; |
c346dca1 | 1241 | struct net *net = dev_net(dev); |
3f2fb9a8 | 1242 | int master_idx; |
1da177e4 LT |
1243 | |
1244 | rcu_read_lock(); | |
e5ed6399 | 1245 | in_dev = __in_dev_get_rcu(dev); |
1da177e4 LT |
1246 | if (!in_dev) |
1247 | goto no_in_dev; | |
1248 | ||
1249 | for_primary_ifa(in_dev) { | |
1250 | if (ifa->ifa_scope > scope) | |
1251 | continue; | |
1252 | if (!dst || inet_ifa_match(dst, ifa)) { | |
1253 | addr = ifa->ifa_local; | |
1254 | break; | |
1255 | } | |
1256 | if (!addr) | |
1257 | addr = ifa->ifa_local; | |
1258 | } endfor_ifa(in_dev); | |
1da177e4 LT |
1259 | |
1260 | if (addr) | |
c6d14c84 | 1261 | goto out_unlock; |
9f9354b9 | 1262 | no_in_dev: |
3f2fb9a8 | 1263 | master_idx = l3mdev_master_ifindex_rcu(dev); |
1da177e4 | 1264 | |
17b693cd DL |
1265 | /* For VRFs, the VRF device takes the place of the loopback device, |
1266 | * with addresses on it being preferred. Note in such cases the | |
1267 | * loopback device will be among the devices that fail the master_idx | |
1268 | * equality check in the loop below. | |
1269 | */ | |
1270 | if (master_idx && | |
1271 | (dev = dev_get_by_index_rcu(net, master_idx)) && | |
1272 | (in_dev = __in_dev_get_rcu(dev))) { | |
8b57fd1e GF |
1273 | addr = in_dev_select_addr(in_dev, scope); |
1274 | if (addr) | |
1275 | goto out_unlock; | |
17b693cd DL |
1276 | } |
1277 | ||
1da177e4 | 1278 | /* Not loopback addresses on loopback should be preferred |
ca9f1fd2 | 1279 | in this case. It is important that lo is the first interface |
1da177e4 LT |
1280 | in dev_base list. |
1281 | */ | |
c6d14c84 | 1282 | for_each_netdev_rcu(net, dev) { |
3f2fb9a8 DA |
1283 | if (l3mdev_master_ifindex_rcu(dev) != master_idx) |
1284 | continue; | |
1285 | ||
9f9354b9 ED |
1286 | in_dev = __in_dev_get_rcu(dev); |
1287 | if (!in_dev) | |
1da177e4 LT |
1288 | continue; |
1289 | ||
8b57fd1e GF |
1290 | addr = in_dev_select_addr(in_dev, scope); |
1291 | if (addr) | |
1292 | goto out_unlock; | |
1da177e4 | 1293 | } |
c6d14c84 | 1294 | out_unlock: |
1da177e4 | 1295 | rcu_read_unlock(); |
1da177e4 LT |
1296 | return addr; |
1297 | } | |
9f9354b9 | 1298 | EXPORT_SYMBOL(inet_select_addr); |
1da177e4 | 1299 | |
60cad5da AV |
1300 | static __be32 confirm_addr_indev(struct in_device *in_dev, __be32 dst, |
1301 | __be32 local, int scope) | |
1da177e4 LT |
1302 | { |
1303 | int same = 0; | |
a144ea4b | 1304 | __be32 addr = 0; |
1da177e4 LT |
1305 | |
1306 | for_ifa(in_dev) { | |
1307 | if (!addr && | |
1308 | (local == ifa->ifa_local || !local) && | |
1309 | ifa->ifa_scope <= scope) { | |
1310 | addr = ifa->ifa_local; | |
1311 | if (same) | |
1312 | break; | |
1313 | } | |
1314 | if (!same) { | |
1315 | same = (!local || inet_ifa_match(local, ifa)) && | |
1316 | (!dst || inet_ifa_match(dst, ifa)); | |
1317 | if (same && addr) { | |
1318 | if (local || !dst) | |
1319 | break; | |
1320 | /* Is the selected addr into dst subnet? */ | |
1321 | if (inet_ifa_match(addr, ifa)) | |
1322 | break; | |
1323 | /* No, then can we use new local src? */ | |
1324 | if (ifa->ifa_scope <= scope) { | |
1325 | addr = ifa->ifa_local; | |
1326 | break; | |
1327 | } | |
1328 | /* search for large dst subnet for addr */ | |
1329 | same = 0; | |
1330 | } | |
1331 | } | |
1332 | } endfor_ifa(in_dev); | |
1333 | ||
9f9354b9 | 1334 | return same ? addr : 0; |
1da177e4 LT |
1335 | } |
1336 | ||
1337 | /* | |
1338 | * Confirm that local IP address exists using wildcards: | |
b601fa19 ND |
1339 | * - net: netns to check, cannot be NULL |
1340 | * - in_dev: only on this interface, NULL=any interface | |
1da177e4 LT |
1341 | * - dst: only in the same subnet as dst, 0=any dst |
1342 | * - local: address, 0=autoselect the local address | |
1343 | * - scope: maximum allowed scope value for the local address | |
1344 | */ | |
b601fa19 | 1345 | __be32 inet_confirm_addr(struct net *net, struct in_device *in_dev, |
9bd85e32 | 1346 | __be32 dst, __be32 local, int scope) |
1da177e4 | 1347 | { |
60cad5da | 1348 | __be32 addr = 0; |
9bd85e32 | 1349 | struct net_device *dev; |
1da177e4 | 1350 | |
00db4124 | 1351 | if (in_dev) |
9bd85e32 | 1352 | return confirm_addr_indev(in_dev, dst, local, scope); |
1da177e4 | 1353 | |
1da177e4 | 1354 | rcu_read_lock(); |
c6d14c84 | 1355 | for_each_netdev_rcu(net, dev) { |
9f9354b9 ED |
1356 | in_dev = __in_dev_get_rcu(dev); |
1357 | if (in_dev) { | |
1da177e4 LT |
1358 | addr = confirm_addr_indev(in_dev, dst, local, scope); |
1359 | if (addr) | |
1360 | break; | |
1361 | } | |
1362 | } | |
1363 | rcu_read_unlock(); | |
1da177e4 LT |
1364 | |
1365 | return addr; | |
1366 | } | |
eaddcd76 | 1367 | EXPORT_SYMBOL(inet_confirm_addr); |
1da177e4 LT |
1368 | |
1369 | /* | |
1370 | * Device notifier | |
1371 | */ | |
1372 | ||
1373 | int register_inetaddr_notifier(struct notifier_block *nb) | |
1374 | { | |
e041c683 | 1375 | return blocking_notifier_chain_register(&inetaddr_chain, nb); |
1da177e4 | 1376 | } |
9f9354b9 | 1377 | EXPORT_SYMBOL(register_inetaddr_notifier); |
1da177e4 LT |
1378 | |
1379 | int unregister_inetaddr_notifier(struct notifier_block *nb) | |
1380 | { | |
e041c683 | 1381 | return blocking_notifier_chain_unregister(&inetaddr_chain, nb); |
1da177e4 | 1382 | } |
9f9354b9 | 1383 | EXPORT_SYMBOL(unregister_inetaddr_notifier); |
1da177e4 | 1384 | |
3ad7d246 KJ |
1385 | int register_inetaddr_validator_notifier(struct notifier_block *nb) |
1386 | { | |
1387 | return blocking_notifier_chain_register(&inetaddr_validator_chain, nb); | |
1388 | } | |
1389 | EXPORT_SYMBOL(register_inetaddr_validator_notifier); | |
1390 | ||
1391 | int unregister_inetaddr_validator_notifier(struct notifier_block *nb) | |
1392 | { | |
1393 | return blocking_notifier_chain_unregister(&inetaddr_validator_chain, | |
1394 | nb); | |
1395 | } | |
1396 | EXPORT_SYMBOL(unregister_inetaddr_validator_notifier); | |
1397 | ||
9f9354b9 ED |
1398 | /* Rename ifa_labels for a device name change. Make some effort to preserve |
1399 | * existing alias numbering and to create unique labels if possible. | |
1da177e4 LT |
1400 | */ |
1401 | static void inetdev_changename(struct net_device *dev, struct in_device *in_dev) | |
e905a9ed | 1402 | { |
1da177e4 LT |
1403 | struct in_ifaddr *ifa; |
1404 | int named = 0; | |
1405 | ||
e905a9ed YH |
1406 | for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { |
1407 | char old[IFNAMSIZ], *dot; | |
1da177e4 LT |
1408 | |
1409 | memcpy(old, ifa->ifa_label, IFNAMSIZ); | |
e905a9ed | 1410 | memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); |
1da177e4 | 1411 | if (named++ == 0) |
573bf470 | 1412 | goto skip; |
44344b2a | 1413 | dot = strchr(old, ':'); |
51456b29 | 1414 | if (!dot) { |
e905a9ed | 1415 | sprintf(old, ":%d", named); |
1da177e4 LT |
1416 | dot = old; |
1417 | } | |
9f9354b9 | 1418 | if (strlen(dot) + strlen(dev->name) < IFNAMSIZ) |
e905a9ed | 1419 | strcat(ifa->ifa_label, dot); |
9f9354b9 | 1420 | else |
e905a9ed | 1421 | strcpy(ifa->ifa_label + (IFNAMSIZ - strlen(dot) - 1), dot); |
573bf470 TG |
1422 | skip: |
1423 | rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0); | |
e905a9ed YH |
1424 | } |
1425 | } | |
1da177e4 | 1426 | |
40384999 | 1427 | static bool inetdev_valid_mtu(unsigned int mtu) |
06770843 BL |
1428 | { |
1429 | return mtu >= 68; | |
1430 | } | |
1431 | ||
d11327ad IC |
1432 | static void inetdev_send_gratuitous_arp(struct net_device *dev, |
1433 | struct in_device *in_dev) | |
1434 | ||
1435 | { | |
b76d0789 | 1436 | struct in_ifaddr *ifa; |
d11327ad | 1437 | |
b76d0789 ZK |
1438 | for (ifa = in_dev->ifa_list; ifa; |
1439 | ifa = ifa->ifa_next) { | |
1440 | arp_send(ARPOP_REQUEST, ETH_P_ARP, | |
1441 | ifa->ifa_local, dev, | |
1442 | ifa->ifa_local, NULL, | |
1443 | dev->dev_addr, NULL); | |
1444 | } | |
d11327ad IC |
1445 | } |
1446 | ||
1da177e4 LT |
1447 | /* Called only under RTNL semaphore */ |
1448 | ||
1449 | static int inetdev_event(struct notifier_block *this, unsigned long event, | |
1450 | void *ptr) | |
1451 | { | |
351638e7 | 1452 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
748e2d93 | 1453 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
0115e8e3 | 1454 | |
1da177e4 LT |
1455 | ASSERT_RTNL(); |
1456 | ||
1457 | if (!in_dev) { | |
8030f544 | 1458 | if (event == NETDEV_REGISTER) { |
1da177e4 | 1459 | in_dev = inetdev_init(dev); |
20e61da7 WC |
1460 | if (IS_ERR(in_dev)) |
1461 | return notifier_from_errno(PTR_ERR(in_dev)); | |
0cc217e1 | 1462 | if (dev->flags & IFF_LOOPBACK) { |
42f811b8 HX |
1463 | IN_DEV_CONF_SET(in_dev, NOXFRM, 1); |
1464 | IN_DEV_CONF_SET(in_dev, NOPOLICY, 1); | |
8030f544 | 1465 | } |
06770843 BL |
1466 | } else if (event == NETDEV_CHANGEMTU) { |
1467 | /* Re-enabling IP */ | |
1468 | if (inetdev_valid_mtu(dev->mtu)) | |
1469 | in_dev = inetdev_init(dev); | |
1da177e4 LT |
1470 | } |
1471 | goto out; | |
1472 | } | |
1473 | ||
1474 | switch (event) { | |
1475 | case NETDEV_REGISTER: | |
91df42be | 1476 | pr_debug("%s: bug\n", __func__); |
a9b3cd7f | 1477 | RCU_INIT_POINTER(dev->ip_ptr, NULL); |
1da177e4 LT |
1478 | break; |
1479 | case NETDEV_UP: | |
06770843 | 1480 | if (!inetdev_valid_mtu(dev->mtu)) |
1da177e4 | 1481 | break; |
0cc217e1 | 1482 | if (dev->flags & IFF_LOOPBACK) { |
9f9354b9 ED |
1483 | struct in_ifaddr *ifa = inet_alloc_ifa(); |
1484 | ||
1485 | if (ifa) { | |
fd23c3b3 | 1486 | INIT_HLIST_NODE(&ifa->hash); |
1da177e4 LT |
1487 | ifa->ifa_local = |
1488 | ifa->ifa_address = htonl(INADDR_LOOPBACK); | |
1489 | ifa->ifa_prefixlen = 8; | |
1490 | ifa->ifa_mask = inet_make_mask(8); | |
1491 | in_dev_hold(in_dev); | |
1492 | ifa->ifa_dev = in_dev; | |
1493 | ifa->ifa_scope = RT_SCOPE_HOST; | |
1494 | memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); | |
5c766d64 JP |
1495 | set_ifa_lifetime(ifa, INFINITY_LIFE_TIME, |
1496 | INFINITY_LIFE_TIME); | |
dfd1582d JP |
1497 | ipv4_devconf_setall(in_dev); |
1498 | neigh_parms_data_state_setall(in_dev->arp_parms); | |
1da177e4 LT |
1499 | inet_insert_ifa(ifa); |
1500 | } | |
1501 | } | |
1502 | ip_mc_up(in_dev); | |
eefef1cf SH |
1503 | /* fall through */ |
1504 | case NETDEV_CHANGEADDR: | |
d11327ad IC |
1505 | if (!IN_DEV_ARP_NOTIFY(in_dev)) |
1506 | break; | |
1507 | /* fall through */ | |
1508 | case NETDEV_NOTIFY_PEERS: | |
a21090cf | 1509 | /* Send gratuitous ARP to notify of link change */ |
d11327ad | 1510 | inetdev_send_gratuitous_arp(dev, in_dev); |
1da177e4 LT |
1511 | break; |
1512 | case NETDEV_DOWN: | |
1513 | ip_mc_down(in_dev); | |
1514 | break; | |
93d9b7d7 | 1515 | case NETDEV_PRE_TYPE_CHANGE: |
75c78500 MS |
1516 | ip_mc_unmap(in_dev); |
1517 | break; | |
93d9b7d7 | 1518 | case NETDEV_POST_TYPE_CHANGE: |
75c78500 MS |
1519 | ip_mc_remap(in_dev); |
1520 | break; | |
1da177e4 | 1521 | case NETDEV_CHANGEMTU: |
06770843 | 1522 | if (inetdev_valid_mtu(dev->mtu)) |
1da177e4 | 1523 | break; |
06770843 | 1524 | /* disable IP when MTU is not enough */ |
1da177e4 LT |
1525 | case NETDEV_UNREGISTER: |
1526 | inetdev_destroy(in_dev); | |
1527 | break; | |
1528 | case NETDEV_CHANGENAME: | |
1529 | /* Do not notify about label change, this event is | |
1530 | * not interesting to applications using netlink. | |
1531 | */ | |
1532 | inetdev_changename(dev, in_dev); | |
1533 | ||
51602b2a | 1534 | devinet_sysctl_unregister(in_dev); |
66f27a52 | 1535 | devinet_sysctl_register(in_dev); |
1da177e4 LT |
1536 | break; |
1537 | } | |
1538 | out: | |
1539 | return NOTIFY_DONE; | |
1540 | } | |
1541 | ||
1542 | static struct notifier_block ip_netdev_notifier = { | |
539afedf | 1543 | .notifier_call = inetdev_event, |
1da177e4 LT |
1544 | }; |
1545 | ||
40384999 | 1546 | static size_t inet_nlmsg_size(void) |
339bf98f TG |
1547 | { |
1548 | return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) | |
1549 | + nla_total_size(4) /* IFA_ADDRESS */ | |
1550 | + nla_total_size(4) /* IFA_LOCAL */ | |
1551 | + nla_total_size(4) /* IFA_BROADCAST */ | |
ad6c8135 | 1552 | + nla_total_size(IFNAMSIZ) /* IFA_LABEL */ |
63b5f152 GU |
1553 | + nla_total_size(4) /* IFA_FLAGS */ |
1554 | + nla_total_size(sizeof(struct ifa_cacheinfo)); /* IFA_CACHEINFO */ | |
339bf98f TG |
1555 | } |
1556 | ||
5c766d64 JP |
1557 | static inline u32 cstamp_delta(unsigned long cstamp) |
1558 | { | |
1559 | return (cstamp - INITIAL_JIFFIES) * 100UL / HZ; | |
1560 | } | |
1561 | ||
1562 | static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, | |
1563 | unsigned long tstamp, u32 preferred, u32 valid) | |
1564 | { | |
1565 | struct ifa_cacheinfo ci; | |
1566 | ||
1567 | ci.cstamp = cstamp_delta(cstamp); | |
1568 | ci.tstamp = cstamp_delta(tstamp); | |
1569 | ci.ifa_prefered = preferred; | |
1570 | ci.ifa_valid = valid; | |
1571 | ||
1572 | return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); | |
1573 | } | |
1574 | ||
1da177e4 | 1575 | static int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa, |
15e47304 | 1576 | u32 portid, u32 seq, int event, unsigned int flags) |
1da177e4 LT |
1577 | { |
1578 | struct ifaddrmsg *ifm; | |
1579 | struct nlmsghdr *nlh; | |
5c766d64 | 1580 | u32 preferred, valid; |
1da177e4 | 1581 | |
15e47304 | 1582 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*ifm), flags); |
51456b29 | 1583 | if (!nlh) |
26932566 | 1584 | return -EMSGSIZE; |
47f68512 TG |
1585 | |
1586 | ifm = nlmsg_data(nlh); | |
1da177e4 LT |
1587 | ifm->ifa_family = AF_INET; |
1588 | ifm->ifa_prefixlen = ifa->ifa_prefixlen; | |
5c766d64 | 1589 | ifm->ifa_flags = ifa->ifa_flags; |
1da177e4 LT |
1590 | ifm->ifa_scope = ifa->ifa_scope; |
1591 | ifm->ifa_index = ifa->ifa_dev->dev->ifindex; | |
47f68512 | 1592 | |
5c766d64 JP |
1593 | if (!(ifm->ifa_flags & IFA_F_PERMANENT)) { |
1594 | preferred = ifa->ifa_preferred_lft; | |
1595 | valid = ifa->ifa_valid_lft; | |
1596 | if (preferred != INFINITY_LIFE_TIME) { | |
1597 | long tval = (jiffies - ifa->ifa_tstamp) / HZ; | |
1598 | ||
1599 | if (preferred > tval) | |
1600 | preferred -= tval; | |
1601 | else | |
1602 | preferred = 0; | |
1603 | if (valid != INFINITY_LIFE_TIME) { | |
1604 | if (valid > tval) | |
1605 | valid -= tval; | |
1606 | else | |
1607 | valid = 0; | |
1608 | } | |
1609 | } | |
1610 | } else { | |
1611 | preferred = INFINITY_LIFE_TIME; | |
1612 | valid = INFINITY_LIFE_TIME; | |
1613 | } | |
f3756b79 | 1614 | if ((ifa->ifa_address && |
930345ea | 1615 | nla_put_in_addr(skb, IFA_ADDRESS, ifa->ifa_address)) || |
f3756b79 | 1616 | (ifa->ifa_local && |
930345ea | 1617 | nla_put_in_addr(skb, IFA_LOCAL, ifa->ifa_local)) || |
f3756b79 | 1618 | (ifa->ifa_broadcast && |
930345ea | 1619 | nla_put_in_addr(skb, IFA_BROADCAST, ifa->ifa_broadcast)) || |
f3756b79 | 1620 | (ifa->ifa_label[0] && |
5c766d64 | 1621 | nla_put_string(skb, IFA_LABEL, ifa->ifa_label)) || |
ad6c8135 | 1622 | nla_put_u32(skb, IFA_FLAGS, ifa->ifa_flags) || |
5c766d64 JP |
1623 | put_cacheinfo(skb, ifa->ifa_cstamp, ifa->ifa_tstamp, |
1624 | preferred, valid)) | |
f3756b79 | 1625 | goto nla_put_failure; |
1da177e4 | 1626 | |
053c095a JB |
1627 | nlmsg_end(skb, nlh); |
1628 | return 0; | |
47f68512 TG |
1629 | |
1630 | nla_put_failure: | |
26932566 PM |
1631 | nlmsg_cancel(skb, nlh); |
1632 | return -EMSGSIZE; | |
1da177e4 LT |
1633 | } |
1634 | ||
1635 | static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) | |
1636 | { | |
3b1e0a65 | 1637 | struct net *net = sock_net(skb->sk); |
eec4df98 ED |
1638 | int h, s_h; |
1639 | int idx, s_idx; | |
1640 | int ip_idx, s_ip_idx; | |
1da177e4 LT |
1641 | struct net_device *dev; |
1642 | struct in_device *in_dev; | |
1643 | struct in_ifaddr *ifa; | |
eec4df98 | 1644 | struct hlist_head *head; |
1da177e4 | 1645 | |
eec4df98 ED |
1646 | s_h = cb->args[0]; |
1647 | s_idx = idx = cb->args[1]; | |
1648 | s_ip_idx = ip_idx = cb->args[2]; | |
1649 | ||
1650 | for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { | |
1651 | idx = 0; | |
1652 | head = &net->dev_index_head[h]; | |
1653 | rcu_read_lock(); | |
0465277f ND |
1654 | cb->seq = atomic_read(&net->ipv4.dev_addr_genid) ^ |
1655 | net->dev_base_seq; | |
b67bfe0d | 1656 | hlist_for_each_entry_rcu(dev, head, index_hlist) { |
eec4df98 ED |
1657 | if (idx < s_idx) |
1658 | goto cont; | |
4b97efdf | 1659 | if (h > s_h || idx > s_idx) |
eec4df98 ED |
1660 | s_ip_idx = 0; |
1661 | in_dev = __in_dev_get_rcu(dev); | |
1662 | if (!in_dev) | |
1663 | goto cont; | |
1da177e4 | 1664 | |
eec4df98 ED |
1665 | for (ifa = in_dev->ifa_list, ip_idx = 0; ifa; |
1666 | ifa = ifa->ifa_next, ip_idx++) { | |
1667 | if (ip_idx < s_ip_idx) | |
1668 | continue; | |
1669 | if (inet_fill_ifaddr(skb, ifa, | |
15e47304 | 1670 | NETLINK_CB(cb->skb).portid, |
1da177e4 | 1671 | cb->nlh->nlmsg_seq, |
053c095a | 1672 | RTM_NEWADDR, NLM_F_MULTI) < 0) { |
eec4df98 ED |
1673 | rcu_read_unlock(); |
1674 | goto done; | |
1675 | } | |
0465277f | 1676 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); |
eec4df98 | 1677 | } |
7562f876 | 1678 | cont: |
eec4df98 ED |
1679 | idx++; |
1680 | } | |
1681 | rcu_read_unlock(); | |
1da177e4 LT |
1682 | } |
1683 | ||
1684 | done: | |
eec4df98 ED |
1685 | cb->args[0] = h; |
1686 | cb->args[1] = idx; | |
1687 | cb->args[2] = ip_idx; | |
1da177e4 LT |
1688 | |
1689 | return skb->len; | |
1690 | } | |
1691 | ||
539afedf | 1692 | static void rtmsg_ifa(int event, struct in_ifaddr *ifa, struct nlmsghdr *nlh, |
15e47304 | 1693 | u32 portid) |
1da177e4 | 1694 | { |
47f68512 | 1695 | struct sk_buff *skb; |
d6062cbb TG |
1696 | u32 seq = nlh ? nlh->nlmsg_seq : 0; |
1697 | int err = -ENOBUFS; | |
4b8aa9ab | 1698 | struct net *net; |
1da177e4 | 1699 | |
c346dca1 | 1700 | net = dev_net(ifa->ifa_dev->dev); |
339bf98f | 1701 | skb = nlmsg_new(inet_nlmsg_size(), GFP_KERNEL); |
51456b29 | 1702 | if (!skb) |
d6062cbb TG |
1703 | goto errout; |
1704 | ||
15e47304 | 1705 | err = inet_fill_ifaddr(skb, ifa, portid, seq, event, 0); |
26932566 PM |
1706 | if (err < 0) { |
1707 | /* -EMSGSIZE implies BUG in inet_nlmsg_size() */ | |
1708 | WARN_ON(err == -EMSGSIZE); | |
1709 | kfree_skb(skb); | |
1710 | goto errout; | |
1711 | } | |
15e47304 | 1712 | rtnl_notify(skb, net, portid, RTNLGRP_IPV4_IFADDR, nlh, GFP_KERNEL); |
1ce85fe4 | 1713 | return; |
d6062cbb TG |
1714 | errout: |
1715 | if (err < 0) | |
4b8aa9ab | 1716 | rtnl_set_sk_err(net, RTNLGRP_IPV4_IFADDR, err); |
1da177e4 LT |
1717 | } |
1718 | ||
b1974ed0 AR |
1719 | static size_t inet_get_link_af_size(const struct net_device *dev, |
1720 | u32 ext_filter_mask) | |
9f0f7272 | 1721 | { |
1fc19aff | 1722 | struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr); |
9f0f7272 TG |
1723 | |
1724 | if (!in_dev) | |
1725 | return 0; | |
1726 | ||
1727 | return nla_total_size(IPV4_DEVCONF_MAX * 4); /* IFLA_INET_CONF */ | |
1728 | } | |
1729 | ||
d5566fd7 SV |
1730 | static int inet_fill_link_af(struct sk_buff *skb, const struct net_device *dev, |
1731 | u32 ext_filter_mask) | |
9f0f7272 | 1732 | { |
1fc19aff | 1733 | struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr); |
9f0f7272 TG |
1734 | struct nlattr *nla; |
1735 | int i; | |
1736 | ||
1737 | if (!in_dev) | |
1738 | return -ENODATA; | |
1739 | ||
1740 | nla = nla_reserve(skb, IFLA_INET_CONF, IPV4_DEVCONF_MAX * 4); | |
51456b29 | 1741 | if (!nla) |
9f0f7272 TG |
1742 | return -EMSGSIZE; |
1743 | ||
1744 | for (i = 0; i < IPV4_DEVCONF_MAX; i++) | |
1745 | ((u32 *) nla_data(nla))[i] = in_dev->cnf.data[i]; | |
1746 | ||
1747 | return 0; | |
1748 | } | |
1749 | ||
1750 | static const struct nla_policy inet_af_policy[IFLA_INET_MAX+1] = { | |
1751 | [IFLA_INET_CONF] = { .type = NLA_NESTED }, | |
1752 | }; | |
1753 | ||
cf7afbfe TG |
1754 | static int inet_validate_link_af(const struct net_device *dev, |
1755 | const struct nlattr *nla) | |
9f0f7272 | 1756 | { |
9f0f7272 TG |
1757 | struct nlattr *a, *tb[IFLA_INET_MAX+1]; |
1758 | int err, rem; | |
1759 | ||
f7fce74e | 1760 | if (dev && !__in_dev_get_rtnl(dev)) |
cf7afbfe | 1761 | return -EAFNOSUPPORT; |
9f0f7272 | 1762 | |
fceb6435 | 1763 | err = nla_parse_nested(tb, IFLA_INET_MAX, nla, inet_af_policy, NULL); |
9f0f7272 TG |
1764 | if (err < 0) |
1765 | return err; | |
1766 | ||
1767 | if (tb[IFLA_INET_CONF]) { | |
1768 | nla_for_each_nested(a, tb[IFLA_INET_CONF], rem) { | |
1769 | int cfgid = nla_type(a); | |
1770 | ||
1771 | if (nla_len(a) < 4) | |
1772 | return -EINVAL; | |
1773 | ||
1774 | if (cfgid <= 0 || cfgid > IPV4_DEVCONF_MAX) | |
1775 | return -EINVAL; | |
1776 | } | |
1777 | } | |
1778 | ||
cf7afbfe TG |
1779 | return 0; |
1780 | } | |
1781 | ||
1782 | static int inet_set_link_af(struct net_device *dev, const struct nlattr *nla) | |
1783 | { | |
f7fce74e | 1784 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
cf7afbfe TG |
1785 | struct nlattr *a, *tb[IFLA_INET_MAX+1]; |
1786 | int rem; | |
1787 | ||
1788 | if (!in_dev) | |
1789 | return -EAFNOSUPPORT; | |
1790 | ||
fceb6435 | 1791 | if (nla_parse_nested(tb, IFLA_INET_MAX, nla, NULL, NULL) < 0) |
cf7afbfe TG |
1792 | BUG(); |
1793 | ||
9f0f7272 TG |
1794 | if (tb[IFLA_INET_CONF]) { |
1795 | nla_for_each_nested(a, tb[IFLA_INET_CONF], rem) | |
1796 | ipv4_devconf_set(in_dev, nla_type(a), nla_get_u32(a)); | |
1797 | } | |
1798 | ||
1799 | return 0; | |
1800 | } | |
1801 | ||
edc9e748 ND |
1802 | static int inet_netconf_msgsize_devconf(int type) |
1803 | { | |
1804 | int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) | |
1805 | + nla_total_size(4); /* NETCONFA_IFINDEX */ | |
136ba622 | 1806 | bool all = false; |
edc9e748 | 1807 | |
136ba622 ZS |
1808 | if (type == NETCONFA_ALL) |
1809 | all = true; | |
1810 | ||
1811 | if (all || type == NETCONFA_FORWARDING) | |
edc9e748 | 1812 | size += nla_total_size(4); |
136ba622 | 1813 | if (all || type == NETCONFA_RP_FILTER) |
cc535dfb | 1814 | size += nla_total_size(4); |
136ba622 | 1815 | if (all || type == NETCONFA_MC_FORWARDING) |
d67b8c61 | 1816 | size += nla_total_size(4); |
136ba622 | 1817 | if (all || type == NETCONFA_PROXY_NEIGH) |
f085ff1c | 1818 | size += nla_total_size(4); |
136ba622 | 1819 | if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) |
974d7af5 | 1820 | size += nla_total_size(4); |
edc9e748 ND |
1821 | |
1822 | return size; | |
1823 | } | |
1824 | ||
1825 | static int inet_netconf_fill_devconf(struct sk_buff *skb, int ifindex, | |
1826 | struct ipv4_devconf *devconf, u32 portid, | |
1827 | u32 seq, int event, unsigned int flags, | |
1828 | int type) | |
1829 | { | |
1830 | struct nlmsghdr *nlh; | |
1831 | struct netconfmsg *ncm; | |
136ba622 | 1832 | bool all = false; |
edc9e748 ND |
1833 | |
1834 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), | |
1835 | flags); | |
51456b29 | 1836 | if (!nlh) |
edc9e748 ND |
1837 | return -EMSGSIZE; |
1838 | ||
136ba622 ZS |
1839 | if (type == NETCONFA_ALL) |
1840 | all = true; | |
1841 | ||
edc9e748 ND |
1842 | ncm = nlmsg_data(nlh); |
1843 | ncm->ncm_family = AF_INET; | |
1844 | ||
1845 | if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0) | |
1846 | goto nla_put_failure; | |
1847 | ||
b5c9641d DA |
1848 | if (!devconf) |
1849 | goto out; | |
1850 | ||
136ba622 | 1851 | if ((all || type == NETCONFA_FORWARDING) && |
edc9e748 ND |
1852 | nla_put_s32(skb, NETCONFA_FORWARDING, |
1853 | IPV4_DEVCONF(*devconf, FORWARDING)) < 0) | |
1854 | goto nla_put_failure; | |
136ba622 | 1855 | if ((all || type == NETCONFA_RP_FILTER) && |
cc535dfb ND |
1856 | nla_put_s32(skb, NETCONFA_RP_FILTER, |
1857 | IPV4_DEVCONF(*devconf, RP_FILTER)) < 0) | |
1858 | goto nla_put_failure; | |
136ba622 | 1859 | if ((all || type == NETCONFA_MC_FORWARDING) && |
d67b8c61 ND |
1860 | nla_put_s32(skb, NETCONFA_MC_FORWARDING, |
1861 | IPV4_DEVCONF(*devconf, MC_FORWARDING)) < 0) | |
1862 | goto nla_put_failure; | |
136ba622 | 1863 | if ((all || type == NETCONFA_PROXY_NEIGH) && |
09aea5df | 1864 | nla_put_s32(skb, NETCONFA_PROXY_NEIGH, |
f085ff1c | 1865 | IPV4_DEVCONF(*devconf, PROXY_ARP)) < 0) |
1866 | goto nla_put_failure; | |
136ba622 | 1867 | if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) && |
974d7af5 AG |
1868 | nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, |
1869 | IPV4_DEVCONF(*devconf, IGNORE_ROUTES_WITH_LINKDOWN)) < 0) | |
1870 | goto nla_put_failure; | |
edc9e748 | 1871 | |
b5c9641d | 1872 | out: |
053c095a JB |
1873 | nlmsg_end(skb, nlh); |
1874 | return 0; | |
edc9e748 ND |
1875 | |
1876 | nla_put_failure: | |
1877 | nlmsg_cancel(skb, nlh); | |
1878 | return -EMSGSIZE; | |
1879 | } | |
1880 | ||
3b022865 DA |
1881 | void inet_netconf_notify_devconf(struct net *net, int event, int type, |
1882 | int ifindex, struct ipv4_devconf *devconf) | |
edc9e748 ND |
1883 | { |
1884 | struct sk_buff *skb; | |
1885 | int err = -ENOBUFS; | |
1886 | ||
fa17806c | 1887 | skb = nlmsg_new(inet_netconf_msgsize_devconf(type), GFP_KERNEL); |
51456b29 | 1888 | if (!skb) |
edc9e748 ND |
1889 | goto errout; |
1890 | ||
1891 | err = inet_netconf_fill_devconf(skb, ifindex, devconf, 0, 0, | |
3b022865 | 1892 | event, 0, type); |
edc9e748 ND |
1893 | if (err < 0) { |
1894 | /* -EMSGSIZE implies BUG in inet_netconf_msgsize_devconf() */ | |
1895 | WARN_ON(err == -EMSGSIZE); | |
1896 | kfree_skb(skb); | |
1897 | goto errout; | |
1898 | } | |
fa17806c | 1899 | rtnl_notify(skb, net, 0, RTNLGRP_IPV4_NETCONF, NULL, GFP_KERNEL); |
edc9e748 ND |
1900 | return; |
1901 | errout: | |
1902 | if (err < 0) | |
1903 | rtnl_set_sk_err(net, RTNLGRP_IPV4_NETCONF, err); | |
1904 | } | |
1905 | ||
9e551110 ND |
1906 | static const struct nla_policy devconf_ipv4_policy[NETCONFA_MAX+1] = { |
1907 | [NETCONFA_IFINDEX] = { .len = sizeof(int) }, | |
1908 | [NETCONFA_FORWARDING] = { .len = sizeof(int) }, | |
cc535dfb | 1909 | [NETCONFA_RP_FILTER] = { .len = sizeof(int) }, |
09aea5df | 1910 | [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) }, |
974d7af5 | 1911 | [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) }, |
9e551110 ND |
1912 | }; |
1913 | ||
1914 | static int inet_netconf_get_devconf(struct sk_buff *in_skb, | |
c21ef3e3 DA |
1915 | struct nlmsghdr *nlh, |
1916 | struct netlink_ext_ack *extack) | |
9e551110 ND |
1917 | { |
1918 | struct net *net = sock_net(in_skb->sk); | |
1919 | struct nlattr *tb[NETCONFA_MAX+1]; | |
1920 | struct netconfmsg *ncm; | |
1921 | struct sk_buff *skb; | |
1922 | struct ipv4_devconf *devconf; | |
1923 | struct in_device *in_dev; | |
1924 | struct net_device *dev; | |
1925 | int ifindex; | |
1926 | int err; | |
1927 | ||
1928 | err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX, | |
c21ef3e3 | 1929 | devconf_ipv4_policy, extack); |
9e551110 ND |
1930 | if (err < 0) |
1931 | goto errout; | |
1932 | ||
a97eb33f | 1933 | err = -EINVAL; |
9e551110 ND |
1934 | if (!tb[NETCONFA_IFINDEX]) |
1935 | goto errout; | |
1936 | ||
1937 | ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); | |
1938 | switch (ifindex) { | |
1939 | case NETCONFA_IFINDEX_ALL: | |
1940 | devconf = net->ipv4.devconf_all; | |
1941 | break; | |
1942 | case NETCONFA_IFINDEX_DEFAULT: | |
1943 | devconf = net->ipv4.devconf_dflt; | |
1944 | break; | |
1945 | default: | |
1946 | dev = __dev_get_by_index(net, ifindex); | |
51456b29 | 1947 | if (!dev) |
9e551110 ND |
1948 | goto errout; |
1949 | in_dev = __in_dev_get_rtnl(dev); | |
51456b29 | 1950 | if (!in_dev) |
9e551110 ND |
1951 | goto errout; |
1952 | devconf = &in_dev->cnf; | |
1953 | break; | |
1954 | } | |
1955 | ||
1956 | err = -ENOBUFS; | |
fa17806c | 1957 | skb = nlmsg_new(inet_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL); |
51456b29 | 1958 | if (!skb) |
9e551110 ND |
1959 | goto errout; |
1960 | ||
1961 | err = inet_netconf_fill_devconf(skb, ifindex, devconf, | |
1962 | NETLINK_CB(in_skb).portid, | |
1963 | nlh->nlmsg_seq, RTM_NEWNETCONF, 0, | |
136ba622 | 1964 | NETCONFA_ALL); |
9e551110 ND |
1965 | if (err < 0) { |
1966 | /* -EMSGSIZE implies BUG in inet_netconf_msgsize_devconf() */ | |
1967 | WARN_ON(err == -EMSGSIZE); | |
1968 | kfree_skb(skb); | |
1969 | goto errout; | |
1970 | } | |
1971 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); | |
1972 | errout: | |
1973 | return err; | |
1974 | } | |
1975 | ||
7a674200 ND |
1976 | static int inet_netconf_dump_devconf(struct sk_buff *skb, |
1977 | struct netlink_callback *cb) | |
1978 | { | |
1979 | struct net *net = sock_net(skb->sk); | |
1980 | int h, s_h; | |
1981 | int idx, s_idx; | |
1982 | struct net_device *dev; | |
1983 | struct in_device *in_dev; | |
1984 | struct hlist_head *head; | |
1985 | ||
1986 | s_h = cb->args[0]; | |
1987 | s_idx = idx = cb->args[1]; | |
1988 | ||
1989 | for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { | |
1990 | idx = 0; | |
1991 | head = &net->dev_index_head[h]; | |
1992 | rcu_read_lock(); | |
0465277f ND |
1993 | cb->seq = atomic_read(&net->ipv4.dev_addr_genid) ^ |
1994 | net->dev_base_seq; | |
7a674200 ND |
1995 | hlist_for_each_entry_rcu(dev, head, index_hlist) { |
1996 | if (idx < s_idx) | |
1997 | goto cont; | |
1998 | in_dev = __in_dev_get_rcu(dev); | |
1999 | if (!in_dev) | |
2000 | goto cont; | |
2001 | ||
2002 | if (inet_netconf_fill_devconf(skb, dev->ifindex, | |
2003 | &in_dev->cnf, | |
2004 | NETLINK_CB(cb->skb).portid, | |
2005 | cb->nlh->nlmsg_seq, | |
2006 | RTM_NEWNETCONF, | |
2007 | NLM_F_MULTI, | |
136ba622 | 2008 | NETCONFA_ALL) < 0) { |
7a674200 ND |
2009 | rcu_read_unlock(); |
2010 | goto done; | |
2011 | } | |
0465277f | 2012 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); |
7a674200 ND |
2013 | cont: |
2014 | idx++; | |
2015 | } | |
2016 | rcu_read_unlock(); | |
2017 | } | |
2018 | if (h == NETDEV_HASHENTRIES) { | |
2019 | if (inet_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL, | |
2020 | net->ipv4.devconf_all, | |
2021 | NETLINK_CB(cb->skb).portid, | |
2022 | cb->nlh->nlmsg_seq, | |
2023 | RTM_NEWNETCONF, NLM_F_MULTI, | |
136ba622 | 2024 | NETCONFA_ALL) < 0) |
7a674200 ND |
2025 | goto done; |
2026 | else | |
2027 | h++; | |
2028 | } | |
2029 | if (h == NETDEV_HASHENTRIES + 1) { | |
2030 | if (inet_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT, | |
2031 | net->ipv4.devconf_dflt, | |
2032 | NETLINK_CB(cb->skb).portid, | |
2033 | cb->nlh->nlmsg_seq, | |
2034 | RTM_NEWNETCONF, NLM_F_MULTI, | |
136ba622 | 2035 | NETCONFA_ALL) < 0) |
7a674200 ND |
2036 | goto done; |
2037 | else | |
2038 | h++; | |
2039 | } | |
2040 | done: | |
2041 | cb->args[0] = h; | |
2042 | cb->args[1] = idx; | |
2043 | ||
2044 | return skb->len; | |
2045 | } | |
2046 | ||
1da177e4 LT |
2047 | #ifdef CONFIG_SYSCTL |
2048 | ||
c0ce9fb3 | 2049 | static void devinet_copy_dflt_conf(struct net *net, int i) |
31be3085 HX |
2050 | { |
2051 | struct net_device *dev; | |
2052 | ||
c6d14c84 ED |
2053 | rcu_read_lock(); |
2054 | for_each_netdev_rcu(net, dev) { | |
31be3085 | 2055 | struct in_device *in_dev; |
c6d14c84 | 2056 | |
31be3085 HX |
2057 | in_dev = __in_dev_get_rcu(dev); |
2058 | if (in_dev && !test_bit(i, in_dev->cnf.state)) | |
9355bbd6 | 2059 | in_dev->cnf.data[i] = net->ipv4.devconf_dflt->data[i]; |
31be3085 | 2060 | } |
c6d14c84 | 2061 | rcu_read_unlock(); |
31be3085 HX |
2062 | } |
2063 | ||
c6d14c84 | 2064 | /* called with RTNL locked */ |
c0ce9fb3 | 2065 | static void inet_forward_change(struct net *net) |
68dd299b PE |
2066 | { |
2067 | struct net_device *dev; | |
586f1211 | 2068 | int on = IPV4_DEVCONF_ALL(net, FORWARDING); |
68dd299b | 2069 | |
586f1211 | 2070 | IPV4_DEVCONF_ALL(net, ACCEPT_REDIRECTS) = !on; |
9355bbd6 | 2071 | IPV4_DEVCONF_DFLT(net, FORWARDING) = on; |
3b022865 DA |
2072 | inet_netconf_notify_devconf(net, RTM_NEWNETCONF, |
2073 | NETCONFA_FORWARDING, | |
edc9e748 ND |
2074 | NETCONFA_IFINDEX_ALL, |
2075 | net->ipv4.devconf_all); | |
3b022865 DA |
2076 | inet_netconf_notify_devconf(net, RTM_NEWNETCONF, |
2077 | NETCONFA_FORWARDING, | |
edc9e748 ND |
2078 | NETCONFA_IFINDEX_DEFAULT, |
2079 | net->ipv4.devconf_dflt); | |
68dd299b | 2080 | |
c0ce9fb3 | 2081 | for_each_netdev(net, dev) { |
68dd299b | 2082 | struct in_device *in_dev; |
fa17806c | 2083 | |
0187bdfb BH |
2084 | if (on) |
2085 | dev_disable_lro(dev); | |
fa17806c ED |
2086 | |
2087 | in_dev = __in_dev_get_rtnl(dev); | |
edc9e748 | 2088 | if (in_dev) { |
68dd299b | 2089 | IN_DEV_CONF_SET(in_dev, FORWARDING, on); |
3b022865 DA |
2090 | inet_netconf_notify_devconf(net, RTM_NEWNETCONF, |
2091 | NETCONFA_FORWARDING, | |
edc9e748 ND |
2092 | dev->ifindex, &in_dev->cnf); |
2093 | } | |
68dd299b | 2094 | } |
68dd299b PE |
2095 | } |
2096 | ||
f085ff1c | 2097 | static int devinet_conf_ifindex(struct net *net, struct ipv4_devconf *cnf) |
2098 | { | |
2099 | if (cnf == net->ipv4.devconf_dflt) | |
2100 | return NETCONFA_IFINDEX_DEFAULT; | |
2101 | else if (cnf == net->ipv4.devconf_all) | |
2102 | return NETCONFA_IFINDEX_ALL; | |
2103 | else { | |
2104 | struct in_device *idev | |
2105 | = container_of(cnf, struct in_device, cnf); | |
2106 | return idev->dev->ifindex; | |
2107 | } | |
2108 | } | |
2109 | ||
fe2c6338 | 2110 | static int devinet_conf_proc(struct ctl_table *ctl, int write, |
8d65af78 | 2111 | void __user *buffer, |
31be3085 HX |
2112 | size_t *lenp, loff_t *ppos) |
2113 | { | |
d01ff0a0 | 2114 | int old_value = *(int *)ctl->data; |
8d65af78 | 2115 | int ret = proc_dointvec(ctl, write, buffer, lenp, ppos); |
d01ff0a0 | 2116 | int new_value = *(int *)ctl->data; |
31be3085 HX |
2117 | |
2118 | if (write) { | |
2119 | struct ipv4_devconf *cnf = ctl->extra1; | |
c0ce9fb3 | 2120 | struct net *net = ctl->extra2; |
31be3085 | 2121 | int i = (int *)ctl->data - cnf->data; |
f085ff1c | 2122 | int ifindex; |
31be3085 HX |
2123 | |
2124 | set_bit(i, cnf->state); | |
2125 | ||
9355bbd6 | 2126 | if (cnf == net->ipv4.devconf_dflt) |
c0ce9fb3 | 2127 | devinet_copy_dflt_conf(net, i); |
d0daebc3 TG |
2128 | if (i == IPV4_DEVCONF_ACCEPT_LOCAL - 1 || |
2129 | i == IPV4_DEVCONF_ROUTE_LOCALNET - 1) | |
d01ff0a0 | 2130 | if ((new_value == 0) && (old_value != 0)) |
4ccfe6d4 | 2131 | rt_cache_flush(net); |
f085ff1c | 2132 | |
cc535dfb ND |
2133 | if (i == IPV4_DEVCONF_RP_FILTER - 1 && |
2134 | new_value != old_value) { | |
f085ff1c | 2135 | ifindex = devinet_conf_ifindex(net, cnf); |
3b022865 DA |
2136 | inet_netconf_notify_devconf(net, RTM_NEWNETCONF, |
2137 | NETCONFA_RP_FILTER, | |
cc535dfb ND |
2138 | ifindex, cnf); |
2139 | } | |
f085ff1c | 2140 | if (i == IPV4_DEVCONF_PROXY_ARP - 1 && |
2141 | new_value != old_value) { | |
2142 | ifindex = devinet_conf_ifindex(net, cnf); | |
3b022865 DA |
2143 | inet_netconf_notify_devconf(net, RTM_NEWNETCONF, |
2144 | NETCONFA_PROXY_NEIGH, | |
f085ff1c | 2145 | ifindex, cnf); |
2146 | } | |
974d7af5 AG |
2147 | if (i == IPV4_DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN - 1 && |
2148 | new_value != old_value) { | |
2149 | ifindex = devinet_conf_ifindex(net, cnf); | |
3b022865 DA |
2150 | inet_netconf_notify_devconf(net, RTM_NEWNETCONF, |
2151 | NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, | |
974d7af5 AG |
2152 | ifindex, cnf); |
2153 | } | |
31be3085 HX |
2154 | } |
2155 | ||
2156 | return ret; | |
2157 | } | |
2158 | ||
fe2c6338 | 2159 | static int devinet_sysctl_forward(struct ctl_table *ctl, int write, |
8d65af78 | 2160 | void __user *buffer, |
1da177e4 LT |
2161 | size_t *lenp, loff_t *ppos) |
2162 | { | |
2163 | int *valp = ctl->data; | |
2164 | int val = *valp; | |
88af182e | 2165 | loff_t pos = *ppos; |
8d65af78 | 2166 | int ret = proc_dointvec(ctl, write, buffer, lenp, ppos); |
1da177e4 LT |
2167 | |
2168 | if (write && *valp != val) { | |
c0ce9fb3 PE |
2169 | struct net *net = ctl->extra2; |
2170 | ||
0187bdfb | 2171 | if (valp != &IPV4_DEVCONF_DFLT(net, FORWARDING)) { |
88af182e EB |
2172 | if (!rtnl_trylock()) { |
2173 | /* Restore the original values before restarting */ | |
2174 | *valp = val; | |
2175 | *ppos = pos; | |
9b8adb5e | 2176 | return restart_syscall(); |
88af182e | 2177 | } |
0187bdfb BH |
2178 | if (valp == &IPV4_DEVCONF_ALL(net, FORWARDING)) { |
2179 | inet_forward_change(net); | |
edc9e748 | 2180 | } else { |
0187bdfb BH |
2181 | struct ipv4_devconf *cnf = ctl->extra1; |
2182 | struct in_device *idev = | |
2183 | container_of(cnf, struct in_device, cnf); | |
edc9e748 ND |
2184 | if (*valp) |
2185 | dev_disable_lro(idev->dev); | |
3b022865 | 2186 | inet_netconf_notify_devconf(net, RTM_NEWNETCONF, |
edc9e748 ND |
2187 | NETCONFA_FORWARDING, |
2188 | idev->dev->ifindex, | |
2189 | cnf); | |
0187bdfb BH |
2190 | } |
2191 | rtnl_unlock(); | |
4ccfe6d4 | 2192 | rt_cache_flush(net); |
edc9e748 | 2193 | } else |
3b022865 DA |
2194 | inet_netconf_notify_devconf(net, RTM_NEWNETCONF, |
2195 | NETCONFA_FORWARDING, | |
edc9e748 ND |
2196 | NETCONFA_IFINDEX_DEFAULT, |
2197 | net->ipv4.devconf_dflt); | |
1da177e4 LT |
2198 | } |
2199 | ||
2200 | return ret; | |
2201 | } | |
2202 | ||
fe2c6338 | 2203 | static int ipv4_doint_and_flush(struct ctl_table *ctl, int write, |
323e126f DM |
2204 | void __user *buffer, |
2205 | size_t *lenp, loff_t *ppos) | |
1da177e4 LT |
2206 | { |
2207 | int *valp = ctl->data; | |
2208 | int val = *valp; | |
8d65af78 | 2209 | int ret = proc_dointvec(ctl, write, buffer, lenp, ppos); |
76e6ebfb | 2210 | struct net *net = ctl->extra2; |
1da177e4 LT |
2211 | |
2212 | if (write && *valp != val) | |
4ccfe6d4 | 2213 | rt_cache_flush(net); |
1da177e4 LT |
2214 | |
2215 | return ret; | |
2216 | } | |
2217 | ||
f8572d8f | 2218 | #define DEVINET_SYSCTL_ENTRY(attr, name, mval, proc) \ |
42f811b8 | 2219 | { \ |
42f811b8 HX |
2220 | .procname = name, \ |
2221 | .data = ipv4_devconf.data + \ | |
02291680 | 2222 | IPV4_DEVCONF_ ## attr - 1, \ |
42f811b8 HX |
2223 | .maxlen = sizeof(int), \ |
2224 | .mode = mval, \ | |
2225 | .proc_handler = proc, \ | |
31be3085 | 2226 | .extra1 = &ipv4_devconf, \ |
42f811b8 HX |
2227 | } |
2228 | ||
2229 | #define DEVINET_SYSCTL_RW_ENTRY(attr, name) \ | |
f8572d8f | 2230 | DEVINET_SYSCTL_ENTRY(attr, name, 0644, devinet_conf_proc) |
42f811b8 HX |
2231 | |
2232 | #define DEVINET_SYSCTL_RO_ENTRY(attr, name) \ | |
f8572d8f | 2233 | DEVINET_SYSCTL_ENTRY(attr, name, 0444, devinet_conf_proc) |
42f811b8 | 2234 | |
f8572d8f EB |
2235 | #define DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, proc) \ |
2236 | DEVINET_SYSCTL_ENTRY(attr, name, 0644, proc) | |
42f811b8 HX |
2237 | |
2238 | #define DEVINET_SYSCTL_FLUSHING_ENTRY(attr, name) \ | |
f8572d8f | 2239 | DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, ipv4_doint_and_flush) |
42f811b8 | 2240 | |
1da177e4 LT |
2241 | static struct devinet_sysctl_table { |
2242 | struct ctl_table_header *sysctl_header; | |
02291680 | 2243 | struct ctl_table devinet_vars[__IPV4_DEVCONF_MAX]; |
1da177e4 LT |
2244 | } devinet_sysctl = { |
2245 | .devinet_vars = { | |
42f811b8 | 2246 | DEVINET_SYSCTL_COMPLEX_ENTRY(FORWARDING, "forwarding", |
f8572d8f | 2247 | devinet_sysctl_forward), |
42f811b8 HX |
2248 | DEVINET_SYSCTL_RO_ENTRY(MC_FORWARDING, "mc_forwarding"), |
2249 | ||
2250 | DEVINET_SYSCTL_RW_ENTRY(ACCEPT_REDIRECTS, "accept_redirects"), | |
2251 | DEVINET_SYSCTL_RW_ENTRY(SECURE_REDIRECTS, "secure_redirects"), | |
2252 | DEVINET_SYSCTL_RW_ENTRY(SHARED_MEDIA, "shared_media"), | |
2253 | DEVINET_SYSCTL_RW_ENTRY(RP_FILTER, "rp_filter"), | |
2254 | DEVINET_SYSCTL_RW_ENTRY(SEND_REDIRECTS, "send_redirects"), | |
2255 | DEVINET_SYSCTL_RW_ENTRY(ACCEPT_SOURCE_ROUTE, | |
2256 | "accept_source_route"), | |
8153a10c | 2257 | DEVINET_SYSCTL_RW_ENTRY(ACCEPT_LOCAL, "accept_local"), |
28f6aeea | 2258 | DEVINET_SYSCTL_RW_ENTRY(SRC_VMARK, "src_valid_mark"), |
42f811b8 HX |
2259 | DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP, "proxy_arp"), |
2260 | DEVINET_SYSCTL_RW_ENTRY(MEDIUM_ID, "medium_id"), | |
2261 | DEVINET_SYSCTL_RW_ENTRY(BOOTP_RELAY, "bootp_relay"), | |
2262 | DEVINET_SYSCTL_RW_ENTRY(LOG_MARTIANS, "log_martians"), | |
2263 | DEVINET_SYSCTL_RW_ENTRY(TAG, "tag"), | |
2264 | DEVINET_SYSCTL_RW_ENTRY(ARPFILTER, "arp_filter"), | |
2265 | DEVINET_SYSCTL_RW_ENTRY(ARP_ANNOUNCE, "arp_announce"), | |
2266 | DEVINET_SYSCTL_RW_ENTRY(ARP_IGNORE, "arp_ignore"), | |
2267 | DEVINET_SYSCTL_RW_ENTRY(ARP_ACCEPT, "arp_accept"), | |
eefef1cf | 2268 | DEVINET_SYSCTL_RW_ENTRY(ARP_NOTIFY, "arp_notify"), |
65324144 | 2269 | DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP_PVLAN, "proxy_arp_pvlan"), |
5c6fe01c WM |
2270 | DEVINET_SYSCTL_RW_ENTRY(FORCE_IGMP_VERSION, |
2271 | "force_igmp_version"), | |
2690048c WM |
2272 | DEVINET_SYSCTL_RW_ENTRY(IGMPV2_UNSOLICITED_REPORT_INTERVAL, |
2273 | "igmpv2_unsolicited_report_interval"), | |
2274 | DEVINET_SYSCTL_RW_ENTRY(IGMPV3_UNSOLICITED_REPORT_INTERVAL, | |
2275 | "igmpv3_unsolicited_report_interval"), | |
0eeb075f AG |
2276 | DEVINET_SYSCTL_RW_ENTRY(IGNORE_ROUTES_WITH_LINKDOWN, |
2277 | "ignore_routes_with_linkdown"), | |
97daf331 JB |
2278 | DEVINET_SYSCTL_RW_ENTRY(DROP_GRATUITOUS_ARP, |
2279 | "drop_gratuitous_arp"), | |
42f811b8 HX |
2280 | |
2281 | DEVINET_SYSCTL_FLUSHING_ENTRY(NOXFRM, "disable_xfrm"), | |
2282 | DEVINET_SYSCTL_FLUSHING_ENTRY(NOPOLICY, "disable_policy"), | |
42f811b8 HX |
2283 | DEVINET_SYSCTL_FLUSHING_ENTRY(PROMOTE_SECONDARIES, |
2284 | "promote_secondaries"), | |
d0daebc3 TG |
2285 | DEVINET_SYSCTL_FLUSHING_ENTRY(ROUTE_LOCALNET, |
2286 | "route_localnet"), | |
12b74dfa JB |
2287 | DEVINET_SYSCTL_FLUSHING_ENTRY(DROP_UNICAST_IN_L2_MULTICAST, |
2288 | "drop_unicast_in_l2_multicast"), | |
1da177e4 | 2289 | }, |
1da177e4 LT |
2290 | }; |
2291 | ||
ea40b324 | 2292 | static int __devinet_sysctl_register(struct net *net, char *dev_name, |
29c994e3 | 2293 | int ifindex, struct ipv4_devconf *p) |
1da177e4 LT |
2294 | { |
2295 | int i; | |
9fa89642 | 2296 | struct devinet_sysctl_table *t; |
8607ddb8 | 2297 | char path[sizeof("net/ipv4/conf/") + IFNAMSIZ]; |
bfada697 | 2298 | |
9fa89642 | 2299 | t = kmemdup(&devinet_sysctl, sizeof(*t), GFP_KERNEL); |
1da177e4 | 2300 | if (!t) |
9fa89642 PE |
2301 | goto out; |
2302 | ||
1da177e4 LT |
2303 | for (i = 0; i < ARRAY_SIZE(t->devinet_vars) - 1; i++) { |
2304 | t->devinet_vars[i].data += (char *)p - (char *)&ipv4_devconf; | |
31be3085 | 2305 | t->devinet_vars[i].extra1 = p; |
c0ce9fb3 | 2306 | t->devinet_vars[i].extra2 = net; |
1da177e4 LT |
2307 | } |
2308 | ||
8607ddb8 | 2309 | snprintf(path, sizeof(path), "net/ipv4/conf/%s", dev_name); |
1da177e4 | 2310 | |
8607ddb8 | 2311 | t->sysctl_header = register_net_sysctl(net, path, t->devinet_vars); |
1da177e4 | 2312 | if (!t->sysctl_header) |
8607ddb8 | 2313 | goto free; |
1da177e4 LT |
2314 | |
2315 | p->sysctl = t; | |
29c994e3 | 2316 | |
3b022865 DA |
2317 | inet_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL, |
2318 | ifindex, p); | |
ea40b324 | 2319 | return 0; |
1da177e4 | 2320 | |
9fa89642 | 2321 | free: |
1da177e4 | 2322 | kfree(t); |
9fa89642 | 2323 | out: |
ea40b324 | 2324 | return -ENOBUFS; |
1da177e4 LT |
2325 | } |
2326 | ||
b5c9641d DA |
2327 | static void __devinet_sysctl_unregister(struct net *net, |
2328 | struct ipv4_devconf *cnf, int ifindex) | |
51602b2a PE |
2329 | { |
2330 | struct devinet_sysctl_table *t = cnf->sysctl; | |
2331 | ||
b5c9641d DA |
2332 | if (t) { |
2333 | cnf->sysctl = NULL; | |
2334 | unregister_net_sysctl_table(t->sysctl_header); | |
2335 | kfree(t); | |
2336 | } | |
51602b2a | 2337 | |
b5c9641d | 2338 | inet_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL); |
51602b2a PE |
2339 | } |
2340 | ||
20e61da7 | 2341 | static int devinet_sysctl_register(struct in_device *idev) |
66f27a52 | 2342 | { |
20e61da7 WC |
2343 | int err; |
2344 | ||
2345 | if (!sysctl_dev_name_is_allowed(idev->dev->name)) | |
2346 | return -EINVAL; | |
2347 | ||
2348 | err = neigh_sysctl_register(idev->dev, idev->arp_parms, NULL); | |
2349 | if (err) | |
2350 | return err; | |
2351 | err = __devinet_sysctl_register(dev_net(idev->dev), idev->dev->name, | |
29c994e3 | 2352 | idev->dev->ifindex, &idev->cnf); |
20e61da7 WC |
2353 | if (err) |
2354 | neigh_sysctl_unregister(idev->arp_parms); | |
2355 | return err; | |
66f27a52 PE |
2356 | } |
2357 | ||
51602b2a | 2358 | static void devinet_sysctl_unregister(struct in_device *idev) |
1da177e4 | 2359 | { |
b5c9641d DA |
2360 | struct net *net = dev_net(idev->dev); |
2361 | ||
2362 | __devinet_sysctl_unregister(net, &idev->cnf, idev->dev->ifindex); | |
51602b2a | 2363 | neigh_sysctl_unregister(idev->arp_parms); |
1da177e4 | 2364 | } |
1da177e4 | 2365 | |
68dd299b PE |
2366 | static struct ctl_table ctl_forward_entry[] = { |
2367 | { | |
68dd299b PE |
2368 | .procname = "ip_forward", |
2369 | .data = &ipv4_devconf.data[ | |
02291680 | 2370 | IPV4_DEVCONF_FORWARDING - 1], |
68dd299b PE |
2371 | .maxlen = sizeof(int), |
2372 | .mode = 0644, | |
2373 | .proc_handler = devinet_sysctl_forward, | |
68dd299b | 2374 | .extra1 = &ipv4_devconf, |
c0ce9fb3 | 2375 | .extra2 = &init_net, |
68dd299b PE |
2376 | }, |
2377 | { }, | |
2378 | }; | |
2a75de0c | 2379 | #endif |
68dd299b | 2380 | |
752d14dc PE |
2381 | static __net_init int devinet_init_net(struct net *net) |
2382 | { | |
2383 | int err; | |
752d14dc | 2384 | struct ipv4_devconf *all, *dflt; |
2a75de0c ED |
2385 | #ifdef CONFIG_SYSCTL |
2386 | struct ctl_table *tbl = ctl_forward_entry; | |
752d14dc | 2387 | struct ctl_table_header *forw_hdr; |
2a75de0c | 2388 | #endif |
752d14dc PE |
2389 | |
2390 | err = -ENOMEM; | |
2391 | all = &ipv4_devconf; | |
2392 | dflt = &ipv4_devconf_dflt; | |
752d14dc | 2393 | |
09ad9bc7 | 2394 | if (!net_eq(net, &init_net)) { |
752d14dc | 2395 | all = kmemdup(all, sizeof(ipv4_devconf), GFP_KERNEL); |
51456b29 | 2396 | if (!all) |
752d14dc PE |
2397 | goto err_alloc_all; |
2398 | ||
2399 | dflt = kmemdup(dflt, sizeof(ipv4_devconf_dflt), GFP_KERNEL); | |
51456b29 | 2400 | if (!dflt) |
752d14dc PE |
2401 | goto err_alloc_dflt; |
2402 | ||
2a75de0c | 2403 | #ifdef CONFIG_SYSCTL |
752d14dc | 2404 | tbl = kmemdup(tbl, sizeof(ctl_forward_entry), GFP_KERNEL); |
51456b29 | 2405 | if (!tbl) |
752d14dc PE |
2406 | goto err_alloc_ctl; |
2407 | ||
02291680 | 2408 | tbl[0].data = &all->data[IPV4_DEVCONF_FORWARDING - 1]; |
752d14dc PE |
2409 | tbl[0].extra1 = all; |
2410 | tbl[0].extra2 = net; | |
2a75de0c | 2411 | #endif |
752d14dc PE |
2412 | } |
2413 | ||
2414 | #ifdef CONFIG_SYSCTL | |
29c994e3 | 2415 | err = __devinet_sysctl_register(net, "all", NETCONFA_IFINDEX_ALL, all); |
752d14dc PE |
2416 | if (err < 0) |
2417 | goto err_reg_all; | |
2418 | ||
29c994e3 ND |
2419 | err = __devinet_sysctl_register(net, "default", |
2420 | NETCONFA_IFINDEX_DEFAULT, dflt); | |
752d14dc PE |
2421 | if (err < 0) |
2422 | goto err_reg_dflt; | |
2423 | ||
2424 | err = -ENOMEM; | |
8607ddb8 | 2425 | forw_hdr = register_net_sysctl(net, "net/ipv4", tbl); |
51456b29 | 2426 | if (!forw_hdr) |
752d14dc | 2427 | goto err_reg_ctl; |
2a75de0c | 2428 | net->ipv4.forw_hdr = forw_hdr; |
752d14dc PE |
2429 | #endif |
2430 | ||
752d14dc PE |
2431 | net->ipv4.devconf_all = all; |
2432 | net->ipv4.devconf_dflt = dflt; | |
2433 | return 0; | |
2434 | ||
2435 | #ifdef CONFIG_SYSCTL | |
2436 | err_reg_ctl: | |
b5c9641d | 2437 | __devinet_sysctl_unregister(net, dflt, NETCONFA_IFINDEX_DEFAULT); |
752d14dc | 2438 | err_reg_dflt: |
b5c9641d | 2439 | __devinet_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL); |
752d14dc PE |
2440 | err_reg_all: |
2441 | if (tbl != ctl_forward_entry) | |
2442 | kfree(tbl); | |
752d14dc | 2443 | err_alloc_ctl: |
2a75de0c | 2444 | #endif |
752d14dc PE |
2445 | if (dflt != &ipv4_devconf_dflt) |
2446 | kfree(dflt); | |
2447 | err_alloc_dflt: | |
2448 | if (all != &ipv4_devconf) | |
2449 | kfree(all); | |
2450 | err_alloc_all: | |
2451 | return err; | |
2452 | } | |
2453 | ||
2454 | static __net_exit void devinet_exit_net(struct net *net) | |
2455 | { | |
2a75de0c | 2456 | #ifdef CONFIG_SYSCTL |
752d14dc PE |
2457 | struct ctl_table *tbl; |
2458 | ||
2459 | tbl = net->ipv4.forw_hdr->ctl_table_arg; | |
752d14dc | 2460 | unregister_net_sysctl_table(net->ipv4.forw_hdr); |
b5c9641d DA |
2461 | __devinet_sysctl_unregister(net, net->ipv4.devconf_dflt, |
2462 | NETCONFA_IFINDEX_DEFAULT); | |
2463 | __devinet_sysctl_unregister(net, net->ipv4.devconf_all, | |
2464 | NETCONFA_IFINDEX_ALL); | |
752d14dc | 2465 | kfree(tbl); |
2a75de0c | 2466 | #endif |
752d14dc PE |
2467 | kfree(net->ipv4.devconf_dflt); |
2468 | kfree(net->ipv4.devconf_all); | |
2469 | } | |
2470 | ||
2471 | static __net_initdata struct pernet_operations devinet_ops = { | |
2472 | .init = devinet_init_net, | |
2473 | .exit = devinet_exit_net, | |
2474 | }; | |
2475 | ||
207895fd | 2476 | static struct rtnl_af_ops inet_af_ops __read_mostly = { |
9f0f7272 TG |
2477 | .family = AF_INET, |
2478 | .fill_link_af = inet_fill_link_af, | |
2479 | .get_link_af_size = inet_get_link_af_size, | |
cf7afbfe TG |
2480 | .validate_link_af = inet_validate_link_af, |
2481 | .set_link_af = inet_set_link_af, | |
9f0f7272 TG |
2482 | }; |
2483 | ||
1da177e4 LT |
2484 | void __init devinet_init(void) |
2485 | { | |
fd23c3b3 DM |
2486 | int i; |
2487 | ||
2488 | for (i = 0; i < IN4_ADDR_HSIZE; i++) | |
2489 | INIT_HLIST_HEAD(&inet_addr_lst[i]); | |
2490 | ||
752d14dc PE |
2491 | register_pernet_subsys(&devinet_ops); |
2492 | ||
1da177e4 LT |
2493 | register_gifconf(PF_INET, inet_gifconf); |
2494 | register_netdevice_notifier(&ip_netdev_notifier); | |
63f3444f | 2495 | |
906e073f | 2496 | queue_delayed_work(system_power_efficient_wq, &check_lifetime_work, 0); |
5c766d64 | 2497 | |
9f0f7272 TG |
2498 | rtnl_af_register(&inet_af_ops); |
2499 | ||
b97bac64 FW |
2500 | rtnl_register(PF_INET, RTM_NEWADDR, inet_rtm_newaddr, NULL, 0); |
2501 | rtnl_register(PF_INET, RTM_DELADDR, inet_rtm_deladdr, NULL, 0); | |
2502 | rtnl_register(PF_INET, RTM_GETADDR, NULL, inet_dump_ifaddr, 0); | |
9e551110 | 2503 | rtnl_register(PF_INET, RTM_GETNETCONF, inet_netconf_get_devconf, |
b97bac64 | 2504 | inet_netconf_dump_devconf, 0); |
1da177e4 | 2505 | } |