Commit | Line | Data |
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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | * NET3 IP device support routines. | |
4 | * | |
1da177e4 | 5 | * Derived from the IP parts of dev.c 1.0.19 |
02c30a84 | 6 | * Authors: Ross Biro |
1da177e4 LT |
7 | * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
8 | * Mark Evans, <evansmp@uhura.aston.ac.uk> | |
9 | * | |
10 | * Additional Authors: | |
11 | * Alan Cox, <gw4pts@gw4pts.ampr.org> | |
12 | * Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> | |
13 | * | |
14 | * Changes: | |
15 | * Alexey Kuznetsov: pa_* fields are replaced with ifaddr | |
16 | * lists. | |
17 | * Cyrus Durgin: updated for kmod | |
18 | * Matthias Andree: in devinet_ioctl, compare label and | |
19 | * address (4.4BSD alias style support), | |
20 | * fall back to comparing just the label | |
21 | * if no match found. | |
22 | */ | |
23 | ||
1da177e4 | 24 | |
7c0f6ba6 | 25 | #include <linux/uaccess.h> |
1da177e4 | 26 | #include <linux/bitops.h> |
4fc268d2 | 27 | #include <linux/capability.h> |
1da177e4 LT |
28 | #include <linux/module.h> |
29 | #include <linux/types.h> | |
30 | #include <linux/kernel.h> | |
174cd4b1 | 31 | #include <linux/sched/signal.h> |
1da177e4 LT |
32 | #include <linux/string.h> |
33 | #include <linux/mm.h> | |
34 | #include <linux/socket.h> | |
35 | #include <linux/sockios.h> | |
36 | #include <linux/in.h> | |
37 | #include <linux/errno.h> | |
38 | #include <linux/interrupt.h> | |
1823730f | 39 | #include <linux/if_addr.h> |
1da177e4 LT |
40 | #include <linux/if_ether.h> |
41 | #include <linux/inet.h> | |
42 | #include <linux/netdevice.h> | |
43 | #include <linux/etherdevice.h> | |
44 | #include <linux/skbuff.h> | |
1da177e4 LT |
45 | #include <linux/init.h> |
46 | #include <linux/notifier.h> | |
47 | #include <linux/inetdevice.h> | |
48 | #include <linux/igmp.h> | |
5a0e3ad6 | 49 | #include <linux/slab.h> |
fd23c3b3 | 50 | #include <linux/hash.h> |
1da177e4 LT |
51 | #ifdef CONFIG_SYSCTL |
52 | #include <linux/sysctl.h> | |
53 | #endif | |
54 | #include <linux/kmod.h> | |
edc9e748 | 55 | #include <linux/netconf.h> |
1da177e4 | 56 | |
14c85021 | 57 | #include <net/arp.h> |
1da177e4 LT |
58 | #include <net/ip.h> |
59 | #include <net/route.h> | |
60 | #include <net/ip_fib.h> | |
63f3444f | 61 | #include <net/rtnetlink.h> |
752d14dc | 62 | #include <net/net_namespace.h> |
5c766d64 | 63 | #include <net/addrconf.h> |
1da177e4 | 64 | |
2e605463 MC |
65 | #define IPV6ONLY_FLAGS \ |
66 | (IFA_F_NODAD | IFA_F_OPTIMISTIC | IFA_F_DADFAILED | \ | |
67 | IFA_F_HOMEADDRESS | IFA_F_TENTATIVE | \ | |
68 | IFA_F_MANAGETEMPADDR | IFA_F_STABLE_PRIVACY) | |
69 | ||
0027ba84 | 70 | static struct ipv4_devconf ipv4_devconf = { |
42f811b8 | 71 | .data = { |
02291680 EB |
72 | [IPV4_DEVCONF_ACCEPT_REDIRECTS - 1] = 1, |
73 | [IPV4_DEVCONF_SEND_REDIRECTS - 1] = 1, | |
74 | [IPV4_DEVCONF_SECURE_REDIRECTS - 1] = 1, | |
75 | [IPV4_DEVCONF_SHARED_MEDIA - 1] = 1, | |
2690048c WM |
76 | [IPV4_DEVCONF_IGMPV2_UNSOLICITED_REPORT_INTERVAL - 1] = 10000 /*ms*/, |
77 | [IPV4_DEVCONF_IGMPV3_UNSOLICITED_REPORT_INTERVAL - 1] = 1000 /*ms*/, | |
fcdb44d0 | 78 | [IPV4_DEVCONF_ARP_EVICT_NOCARRIER - 1] = 1, |
42f811b8 | 79 | }, |
1da177e4 LT |
80 | }; |
81 | ||
82 | static struct ipv4_devconf ipv4_devconf_dflt = { | |
42f811b8 | 83 | .data = { |
02291680 EB |
84 | [IPV4_DEVCONF_ACCEPT_REDIRECTS - 1] = 1, |
85 | [IPV4_DEVCONF_SEND_REDIRECTS - 1] = 1, | |
86 | [IPV4_DEVCONF_SECURE_REDIRECTS - 1] = 1, | |
87 | [IPV4_DEVCONF_SHARED_MEDIA - 1] = 1, | |
88 | [IPV4_DEVCONF_ACCEPT_SOURCE_ROUTE - 1] = 1, | |
2690048c WM |
89 | [IPV4_DEVCONF_IGMPV2_UNSOLICITED_REPORT_INTERVAL - 1] = 10000 /*ms*/, |
90 | [IPV4_DEVCONF_IGMPV3_UNSOLICITED_REPORT_INTERVAL - 1] = 1000 /*ms*/, | |
fcdb44d0 | 91 | [IPV4_DEVCONF_ARP_EVICT_NOCARRIER - 1] = 1, |
42f811b8 | 92 | }, |
1da177e4 LT |
93 | }; |
94 | ||
9355bbd6 PE |
95 | #define IPV4_DEVCONF_DFLT(net, attr) \ |
96 | IPV4_DEVCONF((*net->ipv4.devconf_dflt), attr) | |
42f811b8 | 97 | |
ef7c79ed | 98 | static const struct nla_policy ifa_ipv4_policy[IFA_MAX+1] = { |
5c753978 TG |
99 | [IFA_LOCAL] = { .type = NLA_U32 }, |
100 | [IFA_ADDRESS] = { .type = NLA_U32 }, | |
101 | [IFA_BROADCAST] = { .type = NLA_U32 }, | |
5176f91e | 102 | [IFA_LABEL] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, |
5c766d64 | 103 | [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, |
ad6c8135 | 104 | [IFA_FLAGS] = { .type = NLA_U32 }, |
af4d768a | 105 | [IFA_RT_PRIORITY] = { .type = NLA_U32 }, |
d3807145 | 106 | [IFA_TARGET_NETNSID] = { .type = NLA_S32 }, |
5c753978 TG |
107 | }; |
108 | ||
978a46fa CB |
109 | struct inet_fill_args { |
110 | u32 portid; | |
111 | u32 seq; | |
112 | int event; | |
113 | unsigned int flags; | |
114 | int netnsid; | |
5fcd266a | 115 | int ifindex; |
978a46fa CB |
116 | }; |
117 | ||
40384999 ED |
118 | #define IN4_ADDR_HSIZE_SHIFT 8 |
119 | #define IN4_ADDR_HSIZE (1U << IN4_ADDR_HSIZE_SHIFT) | |
120 | ||
fd23c3b3 | 121 | static struct hlist_head inet_addr_lst[IN4_ADDR_HSIZE]; |
fd23c3b3 | 122 | |
6eada011 | 123 | static u32 inet_addr_hash(const struct net *net, __be32 addr) |
fd23c3b3 | 124 | { |
40384999 | 125 | u32 val = (__force u32) addr ^ net_hash_mix(net); |
fd23c3b3 | 126 | |
40384999 | 127 | return hash_32(val, IN4_ADDR_HSIZE_SHIFT); |
fd23c3b3 DM |
128 | } |
129 | ||
130 | static void inet_hash_insert(struct net *net, struct in_ifaddr *ifa) | |
131 | { | |
40384999 | 132 | u32 hash = inet_addr_hash(net, ifa->ifa_local); |
fd23c3b3 | 133 | |
32a4be48 | 134 | ASSERT_RTNL(); |
fd23c3b3 | 135 | hlist_add_head_rcu(&ifa->hash, &inet_addr_lst[hash]); |
fd23c3b3 DM |
136 | } |
137 | ||
138 | static void inet_hash_remove(struct in_ifaddr *ifa) | |
139 | { | |
32a4be48 | 140 | ASSERT_RTNL(); |
fd23c3b3 | 141 | hlist_del_init_rcu(&ifa->hash); |
fd23c3b3 DM |
142 | } |
143 | ||
9435eb1c DM |
144 | /** |
145 | * __ip_dev_find - find the first device with a given source address. | |
146 | * @net: the net namespace | |
147 | * @addr: the source address | |
148 | * @devref: if true, take a reference on the found device | |
149 | * | |
150 | * If a caller uses devref=false, it should be protected by RCU, or RTNL | |
151 | */ | |
152 | struct net_device *__ip_dev_find(struct net *net, __be32 addr, bool devref) | |
153 | { | |
9435eb1c DM |
154 | struct net_device *result = NULL; |
155 | struct in_ifaddr *ifa; | |
9435eb1c DM |
156 | |
157 | rcu_read_lock(); | |
6e617de8 PA |
158 | ifa = inet_lookup_ifaddr_rcu(net, addr); |
159 | if (!ifa) { | |
406b6f97 DM |
160 | struct flowi4 fl4 = { .daddr = addr }; |
161 | struct fib_result res = { 0 }; | |
162 | struct fib_table *local; | |
163 | ||
164 | /* Fallback to FIB local table so that communication | |
165 | * over loopback subnets work. | |
166 | */ | |
167 | local = fib_get_table(net, RT_TABLE_LOCAL); | |
168 | if (local && | |
169 | !fib_table_lookup(local, &fl4, &res, FIB_LOOKUP_NOREF) && | |
170 | res.type == RTN_LOCAL) | |
171 | result = FIB_RES_DEV(res); | |
6e617de8 PA |
172 | } else { |
173 | result = ifa->ifa_dev->dev; | |
406b6f97 | 174 | } |
9435eb1c DM |
175 | if (result && devref) |
176 | dev_hold(result); | |
177 | rcu_read_unlock(); | |
178 | return result; | |
179 | } | |
180 | EXPORT_SYMBOL(__ip_dev_find); | |
181 | ||
6e617de8 PA |
182 | /* called under RCU lock */ |
183 | struct in_ifaddr *inet_lookup_ifaddr_rcu(struct net *net, __be32 addr) | |
184 | { | |
185 | u32 hash = inet_addr_hash(net, addr); | |
186 | struct in_ifaddr *ifa; | |
187 | ||
188 | hlist_for_each_entry_rcu(ifa, &inet_addr_lst[hash], hash) | |
189 | if (ifa->ifa_local == addr && | |
190 | net_eq(dev_net(ifa->ifa_dev->dev), net)) | |
191 | return ifa; | |
192 | ||
193 | return NULL; | |
194 | } | |
195 | ||
d6062cbb | 196 | static void rtmsg_ifa(int event, struct in_ifaddr *, struct nlmsghdr *, u32); |
1da177e4 | 197 | |
e041c683 | 198 | static BLOCKING_NOTIFIER_HEAD(inetaddr_chain); |
3ad7d246 | 199 | static BLOCKING_NOTIFIER_HEAD(inetaddr_validator_chain); |
2638eb8b FW |
200 | static void inet_del_ifa(struct in_device *in_dev, |
201 | struct in_ifaddr __rcu **ifap, | |
1da177e4 LT |
202 | int destroy); |
203 | #ifdef CONFIG_SYSCTL | |
20e61da7 | 204 | static int devinet_sysctl_register(struct in_device *idev); |
51602b2a PE |
205 | static void devinet_sysctl_unregister(struct in_device *idev); |
206 | #else | |
20e61da7 | 207 | static int devinet_sysctl_register(struct in_device *idev) |
51602b2a | 208 | { |
20e61da7 | 209 | return 0; |
51602b2a | 210 | } |
40384999 | 211 | static void devinet_sysctl_unregister(struct in_device *idev) |
51602b2a PE |
212 | { |
213 | } | |
1da177e4 LT |
214 | #endif |
215 | ||
216 | /* Locks all the inet devices. */ | |
217 | ||
218 | static struct in_ifaddr *inet_alloc_ifa(void) | |
219 | { | |
6126891c | 220 | return kzalloc(sizeof(struct in_ifaddr), GFP_KERNEL_ACCOUNT); |
1da177e4 LT |
221 | } |
222 | ||
223 | static void inet_rcu_free_ifa(struct rcu_head *head) | |
224 | { | |
225 | struct in_ifaddr *ifa = container_of(head, struct in_ifaddr, rcu_head); | |
226 | if (ifa->ifa_dev) | |
227 | in_dev_put(ifa->ifa_dev); | |
228 | kfree(ifa); | |
229 | } | |
230 | ||
40384999 | 231 | static void inet_free_ifa(struct in_ifaddr *ifa) |
1da177e4 LT |
232 | { |
233 | call_rcu(&ifa->rcu_head, inet_rcu_free_ifa); | |
234 | } | |
235 | ||
236 | void in_dev_finish_destroy(struct in_device *idev) | |
237 | { | |
238 | struct net_device *dev = idev->dev; | |
239 | ||
547b792c IJ |
240 | WARN_ON(idev->ifa_list); |
241 | WARN_ON(idev->mc_list); | |
e9897071 | 242 | kfree(rcu_dereference_protected(idev->mc_hash, 1)); |
1da177e4 | 243 | #ifdef NET_REFCNT_DEBUG |
91df42be | 244 | pr_debug("%s: %p=%s\n", __func__, idev, dev ? dev->name : "NIL"); |
1da177e4 LT |
245 | #endif |
246 | dev_put(dev); | |
247 | if (!idev->dead) | |
9f9354b9 ED |
248 | pr_err("Freeing alive in_device %p\n", idev); |
249 | else | |
1da177e4 | 250 | kfree(idev); |
1da177e4 | 251 | } |
9f9354b9 | 252 | EXPORT_SYMBOL(in_dev_finish_destroy); |
1da177e4 | 253 | |
71e27da9 | 254 | static struct in_device *inetdev_init(struct net_device *dev) |
1da177e4 LT |
255 | { |
256 | struct in_device *in_dev; | |
20e61da7 | 257 | int err = -ENOMEM; |
1da177e4 LT |
258 | |
259 | ASSERT_RTNL(); | |
260 | ||
0da974f4 | 261 | in_dev = kzalloc(sizeof(*in_dev), GFP_KERNEL); |
1da177e4 LT |
262 | if (!in_dev) |
263 | goto out; | |
c346dca1 | 264 | memcpy(&in_dev->cnf, dev_net(dev)->ipv4.devconf_dflt, |
9355bbd6 | 265 | sizeof(in_dev->cnf)); |
1da177e4 LT |
266 | in_dev->cnf.sysctl = NULL; |
267 | in_dev->dev = dev; | |
9f9354b9 ED |
268 | in_dev->arp_parms = neigh_parms_alloc(dev, &arp_tbl); |
269 | if (!in_dev->arp_parms) | |
1da177e4 | 270 | goto out_kfree; |
0187bdfb BH |
271 | if (IPV4_DEVCONF(in_dev->cnf, FORWARDING)) |
272 | dev_disable_lro(dev); | |
1da177e4 LT |
273 | /* Reference in_dev->dev */ |
274 | dev_hold(dev); | |
30c4cf57 | 275 | /* Account for reference dev->ip_ptr (below) */ |
7658b36f | 276 | refcount_set(&in_dev->refcnt, 1); |
1da177e4 | 277 | |
20e61da7 WC |
278 | err = devinet_sysctl_register(in_dev); |
279 | if (err) { | |
280 | in_dev->dead = 1; | |
1b49cd71 | 281 | neigh_parms_release(&arp_tbl, in_dev->arp_parms); |
20e61da7 WC |
282 | in_dev_put(in_dev); |
283 | in_dev = NULL; | |
284 | goto out; | |
285 | } | |
1da177e4 LT |
286 | ip_mc_init_dev(in_dev); |
287 | if (dev->flags & IFF_UP) | |
288 | ip_mc_up(in_dev); | |
483479ec | 289 | |
30c4cf57 | 290 | /* we can receive as soon as ip_ptr is set -- do this last */ |
cf778b00 | 291 | rcu_assign_pointer(dev->ip_ptr, in_dev); |
483479ec | 292 | out: |
20e61da7 | 293 | return in_dev ?: ERR_PTR(err); |
1da177e4 LT |
294 | out_kfree: |
295 | kfree(in_dev); | |
296 | in_dev = NULL; | |
297 | goto out; | |
298 | } | |
299 | ||
300 | static void in_dev_rcu_put(struct rcu_head *head) | |
301 | { | |
302 | struct in_device *idev = container_of(head, struct in_device, rcu_head); | |
303 | in_dev_put(idev); | |
304 | } | |
305 | ||
306 | static void inetdev_destroy(struct in_device *in_dev) | |
307 | { | |
1da177e4 | 308 | struct net_device *dev; |
2638eb8b | 309 | struct in_ifaddr *ifa; |
1da177e4 LT |
310 | |
311 | ASSERT_RTNL(); | |
312 | ||
313 | dev = in_dev->dev; | |
1da177e4 LT |
314 | |
315 | in_dev->dead = 1; | |
316 | ||
317 | ip_mc_destroy_dev(in_dev); | |
318 | ||
2638eb8b | 319 | while ((ifa = rtnl_dereference(in_dev->ifa_list)) != NULL) { |
1da177e4 LT |
320 | inet_del_ifa(in_dev, &in_dev->ifa_list, 0); |
321 | inet_free_ifa(ifa); | |
322 | } | |
323 | ||
a9b3cd7f | 324 | RCU_INIT_POINTER(dev->ip_ptr, NULL); |
1da177e4 | 325 | |
51602b2a | 326 | devinet_sysctl_unregister(in_dev); |
1da177e4 LT |
327 | neigh_parms_release(&arp_tbl, in_dev->arp_parms); |
328 | arp_ifdown(dev); | |
329 | ||
330 | call_rcu(&in_dev->rcu_head, in_dev_rcu_put); | |
331 | } | |
332 | ||
ff428d72 | 333 | int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b) |
1da177e4 | 334 | { |
d519e870 FW |
335 | const struct in_ifaddr *ifa; |
336 | ||
1da177e4 | 337 | rcu_read_lock(); |
d519e870 | 338 | in_dev_for_each_ifa_rcu(ifa, in_dev) { |
1da177e4 LT |
339 | if (inet_ifa_match(a, ifa)) { |
340 | if (!b || inet_ifa_match(b, ifa)) { | |
341 | rcu_read_unlock(); | |
342 | return 1; | |
343 | } | |
344 | } | |
d519e870 | 345 | } |
1da177e4 LT |
346 | rcu_read_unlock(); |
347 | return 0; | |
348 | } | |
349 | ||
2638eb8b FW |
350 | static void __inet_del_ifa(struct in_device *in_dev, |
351 | struct in_ifaddr __rcu **ifap, | |
352 | int destroy, struct nlmsghdr *nlh, u32 portid) | |
1da177e4 | 353 | { |
8f937c60 | 354 | struct in_ifaddr *promote = NULL; |
2638eb8b FW |
355 | struct in_ifaddr *ifa, *ifa1; |
356 | struct in_ifaddr *last_prim; | |
0ff60a45 JHS |
357 | struct in_ifaddr *prev_prom = NULL; |
358 | int do_promote = IN_DEV_PROMOTE_SECONDARIES(in_dev); | |
1da177e4 LT |
359 | |
360 | ASSERT_RTNL(); | |
361 | ||
2638eb8b FW |
362 | ifa1 = rtnl_dereference(*ifap); |
363 | last_prim = rtnl_dereference(in_dev->ifa_list); | |
fbd40ea0 DM |
364 | if (in_dev->dead) |
365 | goto no_promotions; | |
366 | ||
e905a9ed | 367 | /* 1. Deleting primary ifaddr forces deletion all secondaries |
8f937c60 HW |
368 | * unless alias promotion is set |
369 | **/ | |
1da177e4 LT |
370 | |
371 | if (!(ifa1->ifa_flags & IFA_F_SECONDARY)) { | |
2638eb8b | 372 | struct in_ifaddr __rcu **ifap1 = &ifa1->ifa_next; |
1da177e4 | 373 | |
2638eb8b | 374 | while ((ifa = rtnl_dereference(*ifap1)) != NULL) { |
e905a9ed | 375 | if (!(ifa->ifa_flags & IFA_F_SECONDARY) && |
0ff60a45 JHS |
376 | ifa1->ifa_scope <= ifa->ifa_scope) |
377 | last_prim = ifa; | |
378 | ||
1da177e4 LT |
379 | if (!(ifa->ifa_flags & IFA_F_SECONDARY) || |
380 | ifa1->ifa_mask != ifa->ifa_mask || | |
381 | !inet_ifa_match(ifa1->ifa_address, ifa)) { | |
382 | ifap1 = &ifa->ifa_next; | |
0ff60a45 | 383 | prev_prom = ifa; |
1da177e4 LT |
384 | continue; |
385 | } | |
386 | ||
0ff60a45 | 387 | if (!do_promote) { |
fd23c3b3 | 388 | inet_hash_remove(ifa); |
8f937c60 | 389 | *ifap1 = ifa->ifa_next; |
1da177e4 | 390 | |
15e47304 | 391 | rtmsg_ifa(RTM_DELADDR, ifa, nlh, portid); |
e041c683 AS |
392 | blocking_notifier_call_chain(&inetaddr_chain, |
393 | NETDEV_DOWN, ifa); | |
8f937c60 HW |
394 | inet_free_ifa(ifa); |
395 | } else { | |
396 | promote = ifa; | |
397 | break; | |
398 | } | |
1da177e4 LT |
399 | } |
400 | } | |
401 | ||
2d230e2b JA |
402 | /* On promotion all secondaries from subnet are changing |
403 | * the primary IP, we must remove all their routes silently | |
404 | * and later to add them back with new prefsrc. Do this | |
405 | * while all addresses are on the device list. | |
406 | */ | |
2638eb8b | 407 | for (ifa = promote; ifa; ifa = rtnl_dereference(ifa->ifa_next)) { |
2d230e2b JA |
408 | if (ifa1->ifa_mask == ifa->ifa_mask && |
409 | inet_ifa_match(ifa1->ifa_address, ifa)) | |
410 | fib_del_ifaddr(ifa, ifa1); | |
411 | } | |
412 | ||
fbd40ea0 | 413 | no_promotions: |
1da177e4 LT |
414 | /* 2. Unlink it */ |
415 | ||
416 | *ifap = ifa1->ifa_next; | |
fd23c3b3 | 417 | inet_hash_remove(ifa1); |
1da177e4 LT |
418 | |
419 | /* 3. Announce address deletion */ | |
420 | ||
421 | /* Send message first, then call notifier. | |
422 | At first sight, FIB update triggered by notifier | |
423 | will refer to already deleted ifaddr, that could confuse | |
424 | netlink listeners. It is not true: look, gated sees | |
425 | that route deleted and if it still thinks that ifaddr | |
426 | is valid, it will try to restore deleted routes... Grr. | |
427 | So that, this order is correct. | |
428 | */ | |
15e47304 | 429 | rtmsg_ifa(RTM_DELADDR, ifa1, nlh, portid); |
e041c683 | 430 | blocking_notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa1); |
1da177e4 | 431 | |
0ff60a45 | 432 | if (promote) { |
2638eb8b | 433 | struct in_ifaddr *next_sec; |
0ff60a45 | 434 | |
2638eb8b | 435 | next_sec = rtnl_dereference(promote->ifa_next); |
0ff60a45 | 436 | if (prev_prom) { |
2638eb8b FW |
437 | struct in_ifaddr *last_sec; |
438 | ||
2638eb8b | 439 | rcu_assign_pointer(prev_prom->ifa_next, next_sec); |
6a9e9cea FW |
440 | |
441 | last_sec = rtnl_dereference(last_prim->ifa_next); | |
2638eb8b FW |
442 | rcu_assign_pointer(promote->ifa_next, last_sec); |
443 | rcu_assign_pointer(last_prim->ifa_next, promote); | |
0ff60a45 | 444 | } |
8f937c60 | 445 | |
8f937c60 | 446 | promote->ifa_flags &= ~IFA_F_SECONDARY; |
15e47304 | 447 | rtmsg_ifa(RTM_NEWADDR, promote, nlh, portid); |
e041c683 AS |
448 | blocking_notifier_call_chain(&inetaddr_chain, |
449 | NETDEV_UP, promote); | |
2638eb8b FW |
450 | for (ifa = next_sec; ifa; |
451 | ifa = rtnl_dereference(ifa->ifa_next)) { | |
0ff60a45 JHS |
452 | if (ifa1->ifa_mask != ifa->ifa_mask || |
453 | !inet_ifa_match(ifa1->ifa_address, ifa)) | |
454 | continue; | |
455 | fib_add_ifaddr(ifa); | |
456 | } | |
457 | ||
458 | } | |
6363097c | 459 | if (destroy) |
0ff60a45 | 460 | inet_free_ifa(ifa1); |
1da177e4 LT |
461 | } |
462 | ||
2638eb8b FW |
463 | static void inet_del_ifa(struct in_device *in_dev, |
464 | struct in_ifaddr __rcu **ifap, | |
d6062cbb TG |
465 | int destroy) |
466 | { | |
467 | __inet_del_ifa(in_dev, ifap, destroy, NULL, 0); | |
468 | } | |
469 | ||
5c766d64 JP |
470 | static void check_lifetime(struct work_struct *work); |
471 | ||
472 | static DECLARE_DELAYED_WORK(check_lifetime_work, check_lifetime); | |
473 | ||
d6062cbb | 474 | static int __inet_insert_ifa(struct in_ifaddr *ifa, struct nlmsghdr *nlh, |
de95e047 | 475 | u32 portid, struct netlink_ext_ack *extack) |
1da177e4 | 476 | { |
2638eb8b | 477 | struct in_ifaddr __rcu **last_primary, **ifap; |
1da177e4 | 478 | struct in_device *in_dev = ifa->ifa_dev; |
3ad7d246 | 479 | struct in_validator_info ivi; |
2638eb8b | 480 | struct in_ifaddr *ifa1; |
3ad7d246 | 481 | int ret; |
1da177e4 LT |
482 | |
483 | ASSERT_RTNL(); | |
484 | ||
485 | if (!ifa->ifa_local) { | |
486 | inet_free_ifa(ifa); | |
487 | return 0; | |
488 | } | |
489 | ||
490 | ifa->ifa_flags &= ~IFA_F_SECONDARY; | |
491 | last_primary = &in_dev->ifa_list; | |
492 | ||
2e605463 MC |
493 | /* Don't set IPv6 only flags to IPv4 addresses */ |
494 | ifa->ifa_flags &= ~IPV6ONLY_FLAGS; | |
495 | ||
2638eb8b FW |
496 | ifap = &in_dev->ifa_list; |
497 | ifa1 = rtnl_dereference(*ifap); | |
498 | ||
499 | while (ifa1) { | |
1da177e4 LT |
500 | if (!(ifa1->ifa_flags & IFA_F_SECONDARY) && |
501 | ifa->ifa_scope <= ifa1->ifa_scope) | |
502 | last_primary = &ifa1->ifa_next; | |
503 | if (ifa1->ifa_mask == ifa->ifa_mask && | |
504 | inet_ifa_match(ifa1->ifa_address, ifa)) { | |
505 | if (ifa1->ifa_local == ifa->ifa_local) { | |
506 | inet_free_ifa(ifa); | |
507 | return -EEXIST; | |
508 | } | |
509 | if (ifa1->ifa_scope != ifa->ifa_scope) { | |
510 | inet_free_ifa(ifa); | |
511 | return -EINVAL; | |
512 | } | |
513 | ifa->ifa_flags |= IFA_F_SECONDARY; | |
514 | } | |
2638eb8b FW |
515 | |
516 | ifap = &ifa1->ifa_next; | |
517 | ifa1 = rtnl_dereference(*ifap); | |
1da177e4 LT |
518 | } |
519 | ||
3ad7d246 KJ |
520 | /* Allow any devices that wish to register ifaddr validtors to weigh |
521 | * in now, before changes are committed. The rntl lock is serializing | |
522 | * access here, so the state should not change between a validator call | |
523 | * and a final notify on commit. This isn't invoked on promotion under | |
524 | * the assumption that validators are checking the address itself, and | |
525 | * not the flags. | |
526 | */ | |
527 | ivi.ivi_addr = ifa->ifa_address; | |
528 | ivi.ivi_dev = ifa->ifa_dev; | |
de95e047 | 529 | ivi.extack = extack; |
3ad7d246 KJ |
530 | ret = blocking_notifier_call_chain(&inetaddr_validator_chain, |
531 | NETDEV_UP, &ivi); | |
532 | ret = notifier_to_errno(ret); | |
533 | if (ret) { | |
534 | inet_free_ifa(ifa); | |
535 | return ret; | |
536 | } | |
537 | ||
1da177e4 | 538 | if (!(ifa->ifa_flags & IFA_F_SECONDARY)) { |
63862b5b | 539 | prandom_seed((__force u32) ifa->ifa_local); |
1da177e4 LT |
540 | ifap = last_primary; |
541 | } | |
542 | ||
2638eb8b FW |
543 | rcu_assign_pointer(ifa->ifa_next, *ifap); |
544 | rcu_assign_pointer(*ifap, ifa); | |
1da177e4 | 545 | |
fd23c3b3 DM |
546 | inet_hash_insert(dev_net(in_dev->dev), ifa); |
547 | ||
5c766d64 | 548 | cancel_delayed_work(&check_lifetime_work); |
906e073f | 549 | queue_delayed_work(system_power_efficient_wq, &check_lifetime_work, 0); |
5c766d64 | 550 | |
1da177e4 LT |
551 | /* Send message first, then call notifier. |
552 | Notifier will trigger FIB update, so that | |
553 | listeners of netlink will know about new ifaddr */ | |
15e47304 | 554 | rtmsg_ifa(RTM_NEWADDR, ifa, nlh, portid); |
e041c683 | 555 | blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa); |
1da177e4 LT |
556 | |
557 | return 0; | |
558 | } | |
559 | ||
d6062cbb TG |
560 | static int inet_insert_ifa(struct in_ifaddr *ifa) |
561 | { | |
de95e047 | 562 | return __inet_insert_ifa(ifa, NULL, 0, NULL); |
d6062cbb TG |
563 | } |
564 | ||
1da177e4 LT |
565 | static int inet_set_ifa(struct net_device *dev, struct in_ifaddr *ifa) |
566 | { | |
e5ed6399 | 567 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
1da177e4 LT |
568 | |
569 | ASSERT_RTNL(); | |
570 | ||
571 | if (!in_dev) { | |
71e27da9 HX |
572 | inet_free_ifa(ifa); |
573 | return -ENOBUFS; | |
1da177e4 | 574 | } |
71e27da9 | 575 | ipv4_devconf_setall(in_dev); |
1d4c8c29 | 576 | neigh_parms_data_state_setall(in_dev->arp_parms); |
1da177e4 | 577 | if (ifa->ifa_dev != in_dev) { |
547b792c | 578 | WARN_ON(ifa->ifa_dev); |
1da177e4 LT |
579 | in_dev_hold(in_dev); |
580 | ifa->ifa_dev = in_dev; | |
581 | } | |
f97c1e0c | 582 | if (ipv4_is_loopback(ifa->ifa_local)) |
1da177e4 LT |
583 | ifa->ifa_scope = RT_SCOPE_HOST; |
584 | return inet_insert_ifa(ifa); | |
585 | } | |
586 | ||
8723e1b4 ED |
587 | /* Caller must hold RCU or RTNL : |
588 | * We dont take a reference on found in_device | |
589 | */ | |
7fee0ca2 | 590 | struct in_device *inetdev_by_index(struct net *net, int ifindex) |
1da177e4 LT |
591 | { |
592 | struct net_device *dev; | |
593 | struct in_device *in_dev = NULL; | |
c148fc2e ED |
594 | |
595 | rcu_read_lock(); | |
596 | dev = dev_get_by_index_rcu(net, ifindex); | |
1da177e4 | 597 | if (dev) |
8723e1b4 | 598 | in_dev = rcu_dereference_rtnl(dev->ip_ptr); |
c148fc2e | 599 | rcu_read_unlock(); |
1da177e4 LT |
600 | return in_dev; |
601 | } | |
9f9354b9 | 602 | EXPORT_SYMBOL(inetdev_by_index); |
1da177e4 LT |
603 | |
604 | /* Called only from RTNL semaphored context. No locks. */ | |
605 | ||
60cad5da AV |
606 | struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix, |
607 | __be32 mask) | |
1da177e4 | 608 | { |
d519e870 FW |
609 | struct in_ifaddr *ifa; |
610 | ||
1da177e4 LT |
611 | ASSERT_RTNL(); |
612 | ||
d519e870 | 613 | in_dev_for_each_ifa_rtnl(ifa, in_dev) { |
1da177e4 LT |
614 | if (ifa->ifa_mask == mask && inet_ifa_match(prefix, ifa)) |
615 | return ifa; | |
d519e870 | 616 | } |
1da177e4 LT |
617 | return NULL; |
618 | } | |
619 | ||
690cc863 TC |
620 | static int ip_mc_autojoin_config(struct net *net, bool join, |
621 | const struct in_ifaddr *ifa) | |
93a714d6 | 622 | { |
690cc863 | 623 | #if defined(CONFIG_IP_MULTICAST) |
93a714d6 MC |
624 | struct ip_mreqn mreq = { |
625 | .imr_multiaddr.s_addr = ifa->ifa_address, | |
626 | .imr_ifindex = ifa->ifa_dev->dev->ifindex, | |
627 | }; | |
690cc863 | 628 | struct sock *sk = net->ipv4.mc_autojoin_sk; |
93a714d6 MC |
629 | int ret; |
630 | ||
631 | ASSERT_RTNL(); | |
632 | ||
633 | lock_sock(sk); | |
634 | if (join) | |
54ff9ef3 | 635 | ret = ip_mc_join_group(sk, &mreq); |
93a714d6 | 636 | else |
54ff9ef3 | 637 | ret = ip_mc_leave_group(sk, &mreq); |
93a714d6 MC |
638 | release_sock(sk); |
639 | ||
640 | return ret; | |
690cc863 TC |
641 | #else |
642 | return -EOPNOTSUPP; | |
643 | #endif | |
93a714d6 MC |
644 | } |
645 | ||
c21ef3e3 DA |
646 | static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, |
647 | struct netlink_ext_ack *extack) | |
1da177e4 | 648 | { |
3b1e0a65 | 649 | struct net *net = sock_net(skb->sk); |
2638eb8b | 650 | struct in_ifaddr __rcu **ifap; |
dfdd5fd4 | 651 | struct nlattr *tb[IFA_MAX+1]; |
1da177e4 | 652 | struct in_device *in_dev; |
dfdd5fd4 | 653 | struct ifaddrmsg *ifm; |
2638eb8b | 654 | struct in_ifaddr *ifa; |
30e2379e | 655 | int err; |
1da177e4 LT |
656 | |
657 | ASSERT_RTNL(); | |
658 | ||
8cb08174 JB |
659 | err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, |
660 | ifa_ipv4_policy, extack); | |
dfdd5fd4 TG |
661 | if (err < 0) |
662 | goto errout; | |
663 | ||
664 | ifm = nlmsg_data(nlh); | |
7fee0ca2 | 665 | in_dev = inetdev_by_index(net, ifm->ifa_index); |
51456b29 | 666 | if (!in_dev) { |
dfdd5fd4 TG |
667 | err = -ENODEV; |
668 | goto errout; | |
669 | } | |
670 | ||
2638eb8b | 671 | for (ifap = &in_dev->ifa_list; (ifa = rtnl_dereference(*ifap)) != NULL; |
1da177e4 | 672 | ifap = &ifa->ifa_next) { |
dfdd5fd4 | 673 | if (tb[IFA_LOCAL] && |
67b61f6c | 674 | ifa->ifa_local != nla_get_in_addr(tb[IFA_LOCAL])) |
dfdd5fd4 TG |
675 | continue; |
676 | ||
677 | if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label)) | |
1da177e4 | 678 | continue; |
dfdd5fd4 TG |
679 | |
680 | if (tb[IFA_ADDRESS] && | |
681 | (ifm->ifa_prefixlen != ifa->ifa_prefixlen || | |
67b61f6c | 682 | !inet_ifa_match(nla_get_in_addr(tb[IFA_ADDRESS]), ifa))) |
dfdd5fd4 TG |
683 | continue; |
684 | ||
93a714d6 | 685 | if (ipv4_is_multicast(ifa->ifa_address)) |
690cc863 | 686 | ip_mc_autojoin_config(net, false, ifa); |
15e47304 | 687 | __inet_del_ifa(in_dev, ifap, 1, nlh, NETLINK_CB(skb).portid); |
1da177e4 LT |
688 | return 0; |
689 | } | |
dfdd5fd4 TG |
690 | |
691 | err = -EADDRNOTAVAIL; | |
692 | errout: | |
693 | return err; | |
1da177e4 LT |
694 | } |
695 | ||
5c766d64 JP |
696 | #define INFINITY_LIFE_TIME 0xFFFFFFFF |
697 | ||
698 | static void check_lifetime(struct work_struct *work) | |
699 | { | |
700 | unsigned long now, next, next_sec, next_sched; | |
701 | struct in_ifaddr *ifa; | |
c988d1e8 | 702 | struct hlist_node *n; |
5c766d64 JP |
703 | int i; |
704 | ||
705 | now = jiffies; | |
706 | next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); | |
707 | ||
5c766d64 | 708 | for (i = 0; i < IN4_ADDR_HSIZE; i++) { |
c988d1e8 JP |
709 | bool change_needed = false; |
710 | ||
711 | rcu_read_lock(); | |
b67bfe0d | 712 | hlist_for_each_entry_rcu(ifa, &inet_addr_lst[i], hash) { |
5c766d64 JP |
713 | unsigned long age; |
714 | ||
715 | if (ifa->ifa_flags & IFA_F_PERMANENT) | |
716 | continue; | |
717 | ||
718 | /* We try to batch several events at once. */ | |
719 | age = (now - ifa->ifa_tstamp + | |
720 | ADDRCONF_TIMER_FUZZ_MINUS) / HZ; | |
721 | ||
722 | if (ifa->ifa_valid_lft != INFINITY_LIFE_TIME && | |
723 | age >= ifa->ifa_valid_lft) { | |
c988d1e8 | 724 | change_needed = true; |
5c766d64 JP |
725 | } else if (ifa->ifa_preferred_lft == |
726 | INFINITY_LIFE_TIME) { | |
727 | continue; | |
728 | } else if (age >= ifa->ifa_preferred_lft) { | |
729 | if (time_before(ifa->ifa_tstamp + | |
730 | ifa->ifa_valid_lft * HZ, next)) | |
731 | next = ifa->ifa_tstamp + | |
732 | ifa->ifa_valid_lft * HZ; | |
733 | ||
c988d1e8 JP |
734 | if (!(ifa->ifa_flags & IFA_F_DEPRECATED)) |
735 | change_needed = true; | |
5c766d64 JP |
736 | } else if (time_before(ifa->ifa_tstamp + |
737 | ifa->ifa_preferred_lft * HZ, | |
738 | next)) { | |
739 | next = ifa->ifa_tstamp + | |
740 | ifa->ifa_preferred_lft * HZ; | |
741 | } | |
742 | } | |
c988d1e8 JP |
743 | rcu_read_unlock(); |
744 | if (!change_needed) | |
745 | continue; | |
746 | rtnl_lock(); | |
747 | hlist_for_each_entry_safe(ifa, n, &inet_addr_lst[i], hash) { | |
748 | unsigned long age; | |
749 | ||
750 | if (ifa->ifa_flags & IFA_F_PERMANENT) | |
751 | continue; | |
752 | ||
753 | /* We try to batch several events at once. */ | |
754 | age = (now - ifa->ifa_tstamp + | |
755 | ADDRCONF_TIMER_FUZZ_MINUS) / HZ; | |
756 | ||
757 | if (ifa->ifa_valid_lft != INFINITY_LIFE_TIME && | |
758 | age >= ifa->ifa_valid_lft) { | |
2638eb8b FW |
759 | struct in_ifaddr __rcu **ifap; |
760 | struct in_ifaddr *tmp; | |
761 | ||
762 | ifap = &ifa->ifa_dev->ifa_list; | |
763 | tmp = rtnl_dereference(*ifap); | |
764 | while (tmp) { | |
40008e92 | 765 | if (tmp == ifa) { |
c988d1e8 JP |
766 | inet_del_ifa(ifa->ifa_dev, |
767 | ifap, 1); | |
768 | break; | |
769 | } | |
2638eb8b FW |
770 | ifap = &tmp->ifa_next; |
771 | tmp = rtnl_dereference(*ifap); | |
c988d1e8 JP |
772 | } |
773 | } else if (ifa->ifa_preferred_lft != | |
774 | INFINITY_LIFE_TIME && | |
775 | age >= ifa->ifa_preferred_lft && | |
776 | !(ifa->ifa_flags & IFA_F_DEPRECATED)) { | |
777 | ifa->ifa_flags |= IFA_F_DEPRECATED; | |
778 | rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0); | |
779 | } | |
780 | } | |
781 | rtnl_unlock(); | |
5c766d64 | 782 | } |
5c766d64 JP |
783 | |
784 | next_sec = round_jiffies_up(next); | |
785 | next_sched = next; | |
786 | ||
787 | /* If rounded timeout is accurate enough, accept it. */ | |
788 | if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) | |
789 | next_sched = next_sec; | |
790 | ||
791 | now = jiffies; | |
792 | /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ | |
793 | if (time_before(next_sched, now + ADDRCONF_TIMER_FUZZ_MAX)) | |
794 | next_sched = now + ADDRCONF_TIMER_FUZZ_MAX; | |
795 | ||
906e073f | 796 | queue_delayed_work(system_power_efficient_wq, &check_lifetime_work, |
797 | next_sched - now); | |
5c766d64 JP |
798 | } |
799 | ||
800 | static void set_ifa_lifetime(struct in_ifaddr *ifa, __u32 valid_lft, | |
801 | __u32 prefered_lft) | |
802 | { | |
803 | unsigned long timeout; | |
804 | ||
805 | ifa->ifa_flags &= ~(IFA_F_PERMANENT | IFA_F_DEPRECATED); | |
806 | ||
807 | timeout = addrconf_timeout_fixup(valid_lft, HZ); | |
808 | if (addrconf_finite_timeout(timeout)) | |
809 | ifa->ifa_valid_lft = timeout; | |
810 | else | |
811 | ifa->ifa_flags |= IFA_F_PERMANENT; | |
812 | ||
813 | timeout = addrconf_timeout_fixup(prefered_lft, HZ); | |
814 | if (addrconf_finite_timeout(timeout)) { | |
815 | if (timeout == 0) | |
816 | ifa->ifa_flags |= IFA_F_DEPRECATED; | |
817 | ifa->ifa_preferred_lft = timeout; | |
818 | } | |
819 | ifa->ifa_tstamp = jiffies; | |
820 | if (!ifa->ifa_cstamp) | |
821 | ifa->ifa_cstamp = ifa->ifa_tstamp; | |
822 | } | |
823 | ||
824 | static struct in_ifaddr *rtm_to_ifaddr(struct net *net, struct nlmsghdr *nlh, | |
dac9c979 DA |
825 | __u32 *pvalid_lft, __u32 *pprefered_lft, |
826 | struct netlink_ext_ack *extack) | |
1da177e4 | 827 | { |
5c753978 TG |
828 | struct nlattr *tb[IFA_MAX+1]; |
829 | struct in_ifaddr *ifa; | |
830 | struct ifaddrmsg *ifm; | |
1da177e4 LT |
831 | struct net_device *dev; |
832 | struct in_device *in_dev; | |
7b218574 | 833 | int err; |
1da177e4 | 834 | |
8cb08174 JB |
835 | err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, |
836 | ifa_ipv4_policy, extack); | |
5c753978 TG |
837 | if (err < 0) |
838 | goto errout; | |
1da177e4 | 839 | |
5c753978 | 840 | ifm = nlmsg_data(nlh); |
7b218574 | 841 | err = -EINVAL; |
51456b29 | 842 | if (ifm->ifa_prefixlen > 32 || !tb[IFA_LOCAL]) |
5c753978 | 843 | goto errout; |
1da177e4 | 844 | |
4b8aa9ab | 845 | dev = __dev_get_by_index(net, ifm->ifa_index); |
7b218574 | 846 | err = -ENODEV; |
51456b29 | 847 | if (!dev) |
5c753978 | 848 | goto errout; |
1da177e4 | 849 | |
5c753978 | 850 | in_dev = __in_dev_get_rtnl(dev); |
7b218574 | 851 | err = -ENOBUFS; |
51456b29 | 852 | if (!in_dev) |
71e27da9 | 853 | goto errout; |
1da177e4 | 854 | |
5c753978 | 855 | ifa = inet_alloc_ifa(); |
51456b29 | 856 | if (!ifa) |
5c753978 TG |
857 | /* |
858 | * A potential indev allocation can be left alive, it stays | |
859 | * assigned to its device and is destroy with it. | |
860 | */ | |
5c753978 | 861 | goto errout; |
5c753978 | 862 | |
a4e65d36 | 863 | ipv4_devconf_setall(in_dev); |
1d4c8c29 | 864 | neigh_parms_data_state_setall(in_dev->arp_parms); |
5c753978 TG |
865 | in_dev_hold(in_dev); |
866 | ||
51456b29 | 867 | if (!tb[IFA_ADDRESS]) |
5c753978 | 868 | tb[IFA_ADDRESS] = tb[IFA_LOCAL]; |
1da177e4 | 869 | |
fd23c3b3 | 870 | INIT_HLIST_NODE(&ifa->hash); |
1da177e4 LT |
871 | ifa->ifa_prefixlen = ifm->ifa_prefixlen; |
872 | ifa->ifa_mask = inet_make_mask(ifm->ifa_prefixlen); | |
ad6c8135 JP |
873 | ifa->ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : |
874 | ifm->ifa_flags; | |
1da177e4 | 875 | ifa->ifa_scope = ifm->ifa_scope; |
5c753978 TG |
876 | ifa->ifa_dev = in_dev; |
877 | ||
67b61f6c JB |
878 | ifa->ifa_local = nla_get_in_addr(tb[IFA_LOCAL]); |
879 | ifa->ifa_address = nla_get_in_addr(tb[IFA_ADDRESS]); | |
5c753978 TG |
880 | |
881 | if (tb[IFA_BROADCAST]) | |
67b61f6c | 882 | ifa->ifa_broadcast = nla_get_in_addr(tb[IFA_BROADCAST]); |
5c753978 | 883 | |
5c753978 | 884 | if (tb[IFA_LABEL]) |
872f6903 | 885 | nla_strscpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ); |
1da177e4 LT |
886 | else |
887 | memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); | |
888 | ||
af4d768a DA |
889 | if (tb[IFA_RT_PRIORITY]) |
890 | ifa->ifa_rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]); | |
891 | ||
5c766d64 JP |
892 | if (tb[IFA_CACHEINFO]) { |
893 | struct ifa_cacheinfo *ci; | |
894 | ||
895 | ci = nla_data(tb[IFA_CACHEINFO]); | |
896 | if (!ci->ifa_valid || ci->ifa_prefered > ci->ifa_valid) { | |
897 | err = -EINVAL; | |
446266b0 | 898 | goto errout_free; |
5c766d64 JP |
899 | } |
900 | *pvalid_lft = ci->ifa_valid; | |
901 | *pprefered_lft = ci->ifa_prefered; | |
902 | } | |
903 | ||
5c753978 TG |
904 | return ifa; |
905 | ||
446266b0 DB |
906 | errout_free: |
907 | inet_free_ifa(ifa); | |
5c753978 TG |
908 | errout: |
909 | return ERR_PTR(err); | |
910 | } | |
911 | ||
5c766d64 JP |
912 | static struct in_ifaddr *find_matching_ifa(struct in_ifaddr *ifa) |
913 | { | |
914 | struct in_device *in_dev = ifa->ifa_dev; | |
ef11db33 | 915 | struct in_ifaddr *ifa1; |
5c766d64 JP |
916 | |
917 | if (!ifa->ifa_local) | |
918 | return NULL; | |
919 | ||
ef11db33 | 920 | in_dev_for_each_ifa_rtnl(ifa1, in_dev) { |
5c766d64 JP |
921 | if (ifa1->ifa_mask == ifa->ifa_mask && |
922 | inet_ifa_match(ifa1->ifa_address, ifa) && | |
923 | ifa1->ifa_local == ifa->ifa_local) | |
924 | return ifa1; | |
925 | } | |
926 | return NULL; | |
927 | } | |
928 | ||
c21ef3e3 DA |
929 | static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, |
930 | struct netlink_ext_ack *extack) | |
5c753978 | 931 | { |
3b1e0a65 | 932 | struct net *net = sock_net(skb->sk); |
5c753978 | 933 | struct in_ifaddr *ifa; |
5c766d64 JP |
934 | struct in_ifaddr *ifa_existing; |
935 | __u32 valid_lft = INFINITY_LIFE_TIME; | |
936 | __u32 prefered_lft = INFINITY_LIFE_TIME; | |
5c753978 TG |
937 | |
938 | ASSERT_RTNL(); | |
939 | ||
dac9c979 | 940 | ifa = rtm_to_ifaddr(net, nlh, &valid_lft, &prefered_lft, extack); |
5c753978 TG |
941 | if (IS_ERR(ifa)) |
942 | return PTR_ERR(ifa); | |
943 | ||
5c766d64 JP |
944 | ifa_existing = find_matching_ifa(ifa); |
945 | if (!ifa_existing) { | |
946 | /* It would be best to check for !NLM_F_CREATE here but | |
614d056c | 947 | * userspace already relies on not having to provide this. |
5c766d64 JP |
948 | */ |
949 | set_ifa_lifetime(ifa, valid_lft, prefered_lft); | |
93a714d6 | 950 | if (ifa->ifa_flags & IFA_F_MCAUTOJOIN) { |
690cc863 | 951 | int ret = ip_mc_autojoin_config(net, true, ifa); |
93a714d6 MC |
952 | |
953 | if (ret < 0) { | |
954 | inet_free_ifa(ifa); | |
955 | return ret; | |
956 | } | |
957 | } | |
de95e047 DA |
958 | return __inet_insert_ifa(ifa, nlh, NETLINK_CB(skb).portid, |
959 | extack); | |
5c766d64 | 960 | } else { |
af4d768a DA |
961 | u32 new_metric = ifa->ifa_rt_priority; |
962 | ||
5c766d64 JP |
963 | inet_free_ifa(ifa); |
964 | ||
965 | if (nlh->nlmsg_flags & NLM_F_EXCL || | |
966 | !(nlh->nlmsg_flags & NLM_F_REPLACE)) | |
967 | return -EEXIST; | |
34e2ed34 | 968 | ifa = ifa_existing; |
af4d768a DA |
969 | |
970 | if (ifa->ifa_rt_priority != new_metric) { | |
971 | fib_modify_prefix_metric(ifa, new_metric); | |
972 | ifa->ifa_rt_priority = new_metric; | |
973 | } | |
974 | ||
34e2ed34 | 975 | set_ifa_lifetime(ifa, valid_lft, prefered_lft); |
05a324b9 | 976 | cancel_delayed_work(&check_lifetime_work); |
906e073f | 977 | queue_delayed_work(system_power_efficient_wq, |
978 | &check_lifetime_work, 0); | |
34e2ed34 | 979 | rtmsg_ifa(RTM_NEWADDR, ifa, nlh, NETLINK_CB(skb).portid); |
5c766d64 JP |
980 | } |
981 | return 0; | |
1da177e4 LT |
982 | } |
983 | ||
984 | /* | |
985 | * Determine a default network mask, based on the IP address. | |
986 | */ | |
987 | ||
40384999 | 988 | static int inet_abc_len(__be32 addr) |
1da177e4 LT |
989 | { |
990 | int rc = -1; /* Something else, probably a multicast. */ | |
991 | ||
65cab850 | 992 | if (ipv4_is_zeronet(addr) || ipv4_is_lbcast(addr)) |
e905a9ed | 993 | rc = 0; |
1da177e4 | 994 | else { |
714e85be | 995 | __u32 haddr = ntohl(addr); |
714e85be | 996 | if (IN_CLASSA(haddr)) |
1da177e4 | 997 | rc = 8; |
714e85be | 998 | else if (IN_CLASSB(haddr)) |
1da177e4 | 999 | rc = 16; |
714e85be | 1000 | else if (IN_CLASSC(haddr)) |
1da177e4 | 1001 | rc = 24; |
65cab850 DT |
1002 | else if (IN_CLASSE(haddr)) |
1003 | rc = 32; | |
1da177e4 LT |
1004 | } |
1005 | ||
e905a9ed | 1006 | return rc; |
1da177e4 LT |
1007 | } |
1008 | ||
1009 | ||
03aef17b | 1010 | int devinet_ioctl(struct net *net, unsigned int cmd, struct ifreq *ifr) |
1da177e4 | 1011 | { |
1da177e4 | 1012 | struct sockaddr_in sin_orig; |
03aef17b | 1013 | struct sockaddr_in *sin = (struct sockaddr_in *)&ifr->ifr_addr; |
2638eb8b | 1014 | struct in_ifaddr __rcu **ifap = NULL; |
1da177e4 | 1015 | struct in_device *in_dev; |
1da177e4 LT |
1016 | struct in_ifaddr *ifa = NULL; |
1017 | struct net_device *dev; | |
1018 | char *colon; | |
1019 | int ret = -EFAULT; | |
1020 | int tryaddrmatch = 0; | |
1021 | ||
03aef17b | 1022 | ifr->ifr_name[IFNAMSIZ - 1] = 0; |
1da177e4 LT |
1023 | |
1024 | /* save original address for comparison */ | |
1025 | memcpy(&sin_orig, sin, sizeof(*sin)); | |
1026 | ||
03aef17b | 1027 | colon = strchr(ifr->ifr_name, ':'); |
1da177e4 LT |
1028 | if (colon) |
1029 | *colon = 0; | |
1030 | ||
03aef17b | 1031 | dev_load(net, ifr->ifr_name); |
1da177e4 | 1032 | |
132adf54 | 1033 | switch (cmd) { |
1da177e4 LT |
1034 | case SIOCGIFADDR: /* Get interface address */ |
1035 | case SIOCGIFBRDADDR: /* Get the broadcast address */ | |
1036 | case SIOCGIFDSTADDR: /* Get the destination address */ | |
1037 | case SIOCGIFNETMASK: /* Get the netmask for the interface */ | |
1038 | /* Note that these ioctls will not sleep, | |
1039 | so that we do not impose a lock. | |
1040 | One day we will be forced to put shlock here (I mean SMP) | |
1041 | */ | |
1042 | tryaddrmatch = (sin_orig.sin_family == AF_INET); | |
1043 | memset(sin, 0, sizeof(*sin)); | |
1044 | sin->sin_family = AF_INET; | |
1045 | break; | |
1046 | ||
1047 | case SIOCSIFFLAGS: | |
bf5b30b8 | 1048 | ret = -EPERM; |
52e804c6 | 1049 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
1050 | goto out; |
1051 | break; | |
1052 | case SIOCSIFADDR: /* Set interface address (and family) */ | |
1053 | case SIOCSIFBRDADDR: /* Set the broadcast address */ | |
1054 | case SIOCSIFDSTADDR: /* Set the destination address */ | |
1055 | case SIOCSIFNETMASK: /* Set the netmask for the interface */ | |
bf5b30b8 | 1056 | ret = -EPERM; |
52e804c6 | 1057 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
1058 | goto out; |
1059 | ret = -EINVAL; | |
1060 | if (sin->sin_family != AF_INET) | |
1061 | goto out; | |
1062 | break; | |
1063 | default: | |
1064 | ret = -EINVAL; | |
1065 | goto out; | |
1066 | } | |
1067 | ||
1068 | rtnl_lock(); | |
1069 | ||
1070 | ret = -ENODEV; | |
03aef17b | 1071 | dev = __dev_get_by_name(net, ifr->ifr_name); |
9f9354b9 | 1072 | if (!dev) |
1da177e4 LT |
1073 | goto done; |
1074 | ||
1075 | if (colon) | |
1076 | *colon = ':'; | |
1077 | ||
9f9354b9 ED |
1078 | in_dev = __in_dev_get_rtnl(dev); |
1079 | if (in_dev) { | |
1da177e4 LT |
1080 | if (tryaddrmatch) { |
1081 | /* Matthias Andree */ | |
1082 | /* compare label and address (4.4BSD style) */ | |
1083 | /* note: we only do this for a limited set of ioctls | |
1084 | and only if the original address family was AF_INET. | |
1085 | This is checked above. */ | |
2638eb8b FW |
1086 | |
1087 | for (ifap = &in_dev->ifa_list; | |
1088 | (ifa = rtnl_dereference(*ifap)) != NULL; | |
1da177e4 | 1089 | ifap = &ifa->ifa_next) { |
03aef17b | 1090 | if (!strcmp(ifr->ifr_name, ifa->ifa_label) && |
1da177e4 | 1091 | sin_orig.sin_addr.s_addr == |
6c91afe1 | 1092 | ifa->ifa_local) { |
1da177e4 LT |
1093 | break; /* found */ |
1094 | } | |
1095 | } | |
1096 | } | |
1097 | /* we didn't get a match, maybe the application is | |
1098 | 4.3BSD-style and passed in junk so we fall back to | |
1099 | comparing just the label */ | |
1100 | if (!ifa) { | |
2638eb8b FW |
1101 | for (ifap = &in_dev->ifa_list; |
1102 | (ifa = rtnl_dereference(*ifap)) != NULL; | |
1da177e4 | 1103 | ifap = &ifa->ifa_next) |
03aef17b | 1104 | if (!strcmp(ifr->ifr_name, ifa->ifa_label)) |
1da177e4 LT |
1105 | break; |
1106 | } | |
1107 | } | |
1108 | ||
1109 | ret = -EADDRNOTAVAIL; | |
1110 | if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS) | |
1111 | goto done; | |
1112 | ||
132adf54 | 1113 | switch (cmd) { |
1da177e4 | 1114 | case SIOCGIFADDR: /* Get interface address */ |
30e948a3 | 1115 | ret = 0; |
1da177e4 | 1116 | sin->sin_addr.s_addr = ifa->ifa_local; |
03aef17b | 1117 | break; |
1da177e4 LT |
1118 | |
1119 | case SIOCGIFBRDADDR: /* Get the broadcast address */ | |
30e948a3 | 1120 | ret = 0; |
1da177e4 | 1121 | sin->sin_addr.s_addr = ifa->ifa_broadcast; |
03aef17b | 1122 | break; |
1da177e4 LT |
1123 | |
1124 | case SIOCGIFDSTADDR: /* Get the destination address */ | |
30e948a3 | 1125 | ret = 0; |
1da177e4 | 1126 | sin->sin_addr.s_addr = ifa->ifa_address; |
03aef17b | 1127 | break; |
1da177e4 LT |
1128 | |
1129 | case SIOCGIFNETMASK: /* Get the netmask for the interface */ | |
30e948a3 | 1130 | ret = 0; |
1da177e4 | 1131 | sin->sin_addr.s_addr = ifa->ifa_mask; |
03aef17b | 1132 | break; |
1da177e4 LT |
1133 | |
1134 | case SIOCSIFFLAGS: | |
1135 | if (colon) { | |
1136 | ret = -EADDRNOTAVAIL; | |
1137 | if (!ifa) | |
1138 | break; | |
1139 | ret = 0; | |
03aef17b | 1140 | if (!(ifr->ifr_flags & IFF_UP)) |
1da177e4 LT |
1141 | inet_del_ifa(in_dev, ifap, 1); |
1142 | break; | |
1143 | } | |
567c5e13 | 1144 | ret = dev_change_flags(dev, ifr->ifr_flags, NULL); |
1da177e4 LT |
1145 | break; |
1146 | ||
1147 | case SIOCSIFADDR: /* Set interface address (and family) */ | |
1148 | ret = -EINVAL; | |
1149 | if (inet_abc_len(sin->sin_addr.s_addr) < 0) | |
1150 | break; | |
1151 | ||
1152 | if (!ifa) { | |
1153 | ret = -ENOBUFS; | |
9f9354b9 ED |
1154 | ifa = inet_alloc_ifa(); |
1155 | if (!ifa) | |
1da177e4 | 1156 | break; |
c7e2e1d7 | 1157 | INIT_HLIST_NODE(&ifa->hash); |
1da177e4 | 1158 | if (colon) |
03aef17b | 1159 | memcpy(ifa->ifa_label, ifr->ifr_name, IFNAMSIZ); |
1da177e4 LT |
1160 | else |
1161 | memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); | |
1162 | } else { | |
1163 | ret = 0; | |
1164 | if (ifa->ifa_local == sin->sin_addr.s_addr) | |
1165 | break; | |
1166 | inet_del_ifa(in_dev, ifap, 0); | |
1167 | ifa->ifa_broadcast = 0; | |
148f9729 | 1168 | ifa->ifa_scope = 0; |
1da177e4 LT |
1169 | } |
1170 | ||
1171 | ifa->ifa_address = ifa->ifa_local = sin->sin_addr.s_addr; | |
1172 | ||
1173 | if (!(dev->flags & IFF_POINTOPOINT)) { | |
1174 | ifa->ifa_prefixlen = inet_abc_len(ifa->ifa_address); | |
1175 | ifa->ifa_mask = inet_make_mask(ifa->ifa_prefixlen); | |
1176 | if ((dev->flags & IFF_BROADCAST) && | |
1177 | ifa->ifa_prefixlen < 31) | |
1178 | ifa->ifa_broadcast = ifa->ifa_address | | |
1179 | ~ifa->ifa_mask; | |
1180 | } else { | |
1181 | ifa->ifa_prefixlen = 32; | |
1182 | ifa->ifa_mask = inet_make_mask(32); | |
1183 | } | |
5c766d64 | 1184 | set_ifa_lifetime(ifa, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); |
1da177e4 LT |
1185 | ret = inet_set_ifa(dev, ifa); |
1186 | break; | |
1187 | ||
1188 | case SIOCSIFBRDADDR: /* Set the broadcast address */ | |
1189 | ret = 0; | |
1190 | if (ifa->ifa_broadcast != sin->sin_addr.s_addr) { | |
1191 | inet_del_ifa(in_dev, ifap, 0); | |
1192 | ifa->ifa_broadcast = sin->sin_addr.s_addr; | |
1193 | inet_insert_ifa(ifa); | |
1194 | } | |
1195 | break; | |
1196 | ||
1197 | case SIOCSIFDSTADDR: /* Set the destination address */ | |
1198 | ret = 0; | |
1199 | if (ifa->ifa_address == sin->sin_addr.s_addr) | |
1200 | break; | |
1201 | ret = -EINVAL; | |
1202 | if (inet_abc_len(sin->sin_addr.s_addr) < 0) | |
1203 | break; | |
1204 | ret = 0; | |
1205 | inet_del_ifa(in_dev, ifap, 0); | |
1206 | ifa->ifa_address = sin->sin_addr.s_addr; | |
1207 | inet_insert_ifa(ifa); | |
1208 | break; | |
1209 | ||
1210 | case SIOCSIFNETMASK: /* Set the netmask for the interface */ | |
1211 | ||
1212 | /* | |
1213 | * The mask we set must be legal. | |
1214 | */ | |
1215 | ret = -EINVAL; | |
1216 | if (bad_mask(sin->sin_addr.s_addr, 0)) | |
1217 | break; | |
1218 | ret = 0; | |
1219 | if (ifa->ifa_mask != sin->sin_addr.s_addr) { | |
a144ea4b | 1220 | __be32 old_mask = ifa->ifa_mask; |
1da177e4 LT |
1221 | inet_del_ifa(in_dev, ifap, 0); |
1222 | ifa->ifa_mask = sin->sin_addr.s_addr; | |
1223 | ifa->ifa_prefixlen = inet_mask_len(ifa->ifa_mask); | |
1224 | ||
1225 | /* See if current broadcast address matches | |
1226 | * with current netmask, then recalculate | |
1227 | * the broadcast address. Otherwise it's a | |
1228 | * funny address, so don't touch it since | |
1229 | * the user seems to know what (s)he's doing... | |
1230 | */ | |
1231 | if ((dev->flags & IFF_BROADCAST) && | |
1232 | (ifa->ifa_prefixlen < 31) && | |
1233 | (ifa->ifa_broadcast == | |
dcab5e1e | 1234 | (ifa->ifa_local|~old_mask))) { |
1da177e4 LT |
1235 | ifa->ifa_broadcast = (ifa->ifa_local | |
1236 | ~sin->sin_addr.s_addr); | |
1237 | } | |
1238 | inet_insert_ifa(ifa); | |
1239 | } | |
1240 | break; | |
1241 | } | |
1242 | done: | |
1243 | rtnl_unlock(); | |
1244 | out: | |
1245 | return ret; | |
1da177e4 LT |
1246 | } |
1247 | ||
b0e99d03 | 1248 | int inet_gifconf(struct net_device *dev, char __user *buf, int len, int size) |
1da177e4 | 1249 | { |
e5ed6399 | 1250 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
ef11db33 | 1251 | const struct in_ifaddr *ifa; |
1da177e4 LT |
1252 | struct ifreq ifr; |
1253 | int done = 0; | |
1254 | ||
36fd633e AV |
1255 | if (WARN_ON(size > sizeof(struct ifreq))) |
1256 | goto out; | |
1257 | ||
9f9354b9 | 1258 | if (!in_dev) |
1da177e4 LT |
1259 | goto out; |
1260 | ||
ef11db33 | 1261 | in_dev_for_each_ifa_rtnl(ifa, in_dev) { |
1da177e4 | 1262 | if (!buf) { |
36fd633e | 1263 | done += size; |
1da177e4 LT |
1264 | continue; |
1265 | } | |
36fd633e | 1266 | if (len < size) |
1da177e4 LT |
1267 | break; |
1268 | memset(&ifr, 0, sizeof(struct ifreq)); | |
4299c8a9 | 1269 | strcpy(ifr.ifr_name, ifa->ifa_label); |
1da177e4 LT |
1270 | |
1271 | (*(struct sockaddr_in *)&ifr.ifr_addr).sin_family = AF_INET; | |
1272 | (*(struct sockaddr_in *)&ifr.ifr_addr).sin_addr.s_addr = | |
1273 | ifa->ifa_local; | |
1274 | ||
36fd633e | 1275 | if (copy_to_user(buf + done, &ifr, size)) { |
1da177e4 LT |
1276 | done = -EFAULT; |
1277 | break; | |
1278 | } | |
36fd633e AV |
1279 | len -= size; |
1280 | done += size; | |
1da177e4 LT |
1281 | } |
1282 | out: | |
1283 | return done; | |
1284 | } | |
1285 | ||
8b57fd1e GF |
1286 | static __be32 in_dev_select_addr(const struct in_device *in_dev, |
1287 | int scope) | |
1288 | { | |
d519e870 FW |
1289 | const struct in_ifaddr *ifa; |
1290 | ||
1291 | in_dev_for_each_ifa_rcu(ifa, in_dev) { | |
1292 | if (ifa->ifa_flags & IFA_F_SECONDARY) | |
1293 | continue; | |
8b57fd1e GF |
1294 | if (ifa->ifa_scope != RT_SCOPE_LINK && |
1295 | ifa->ifa_scope <= scope) | |
1296 | return ifa->ifa_local; | |
d519e870 | 1297 | } |
8b57fd1e GF |
1298 | |
1299 | return 0; | |
1300 | } | |
1301 | ||
a61ced5d | 1302 | __be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope) |
1da177e4 | 1303 | { |
d519e870 | 1304 | const struct in_ifaddr *ifa; |
a61ced5d | 1305 | __be32 addr = 0; |
d8c444d5 | 1306 | unsigned char localnet_scope = RT_SCOPE_HOST; |
1da177e4 | 1307 | struct in_device *in_dev; |
c346dca1 | 1308 | struct net *net = dev_net(dev); |
3f2fb9a8 | 1309 | int master_idx; |
1da177e4 LT |
1310 | |
1311 | rcu_read_lock(); | |
e5ed6399 | 1312 | in_dev = __in_dev_get_rcu(dev); |
1da177e4 LT |
1313 | if (!in_dev) |
1314 | goto no_in_dev; | |
1315 | ||
d8c444d5 SL |
1316 | if (unlikely(IN_DEV_ROUTE_LOCALNET(in_dev))) |
1317 | localnet_scope = RT_SCOPE_LINK; | |
1318 | ||
d519e870 FW |
1319 | in_dev_for_each_ifa_rcu(ifa, in_dev) { |
1320 | if (ifa->ifa_flags & IFA_F_SECONDARY) | |
1321 | continue; | |
d8c444d5 | 1322 | if (min(ifa->ifa_scope, localnet_scope) > scope) |
1da177e4 LT |
1323 | continue; |
1324 | if (!dst || inet_ifa_match(dst, ifa)) { | |
1325 | addr = ifa->ifa_local; | |
1326 | break; | |
1327 | } | |
1328 | if (!addr) | |
1329 | addr = ifa->ifa_local; | |
d519e870 | 1330 | } |
1da177e4 LT |
1331 | |
1332 | if (addr) | |
c6d14c84 | 1333 | goto out_unlock; |
9f9354b9 | 1334 | no_in_dev: |
3f2fb9a8 | 1335 | master_idx = l3mdev_master_ifindex_rcu(dev); |
1da177e4 | 1336 | |
17b693cd DL |
1337 | /* For VRFs, the VRF device takes the place of the loopback device, |
1338 | * with addresses on it being preferred. Note in such cases the | |
1339 | * loopback device will be among the devices that fail the master_idx | |
1340 | * equality check in the loop below. | |
1341 | */ | |
1342 | if (master_idx && | |
1343 | (dev = dev_get_by_index_rcu(net, master_idx)) && | |
1344 | (in_dev = __in_dev_get_rcu(dev))) { | |
8b57fd1e GF |
1345 | addr = in_dev_select_addr(in_dev, scope); |
1346 | if (addr) | |
1347 | goto out_unlock; | |
17b693cd DL |
1348 | } |
1349 | ||
1da177e4 | 1350 | /* Not loopback addresses on loopback should be preferred |
ca9f1fd2 | 1351 | in this case. It is important that lo is the first interface |
1da177e4 LT |
1352 | in dev_base list. |
1353 | */ | |
c6d14c84 | 1354 | for_each_netdev_rcu(net, dev) { |
3f2fb9a8 DA |
1355 | if (l3mdev_master_ifindex_rcu(dev) != master_idx) |
1356 | continue; | |
1357 | ||
9f9354b9 ED |
1358 | in_dev = __in_dev_get_rcu(dev); |
1359 | if (!in_dev) | |
1da177e4 LT |
1360 | continue; |
1361 | ||
8b57fd1e GF |
1362 | addr = in_dev_select_addr(in_dev, scope); |
1363 | if (addr) | |
1364 | goto out_unlock; | |
1da177e4 | 1365 | } |
c6d14c84 | 1366 | out_unlock: |
1da177e4 | 1367 | rcu_read_unlock(); |
1da177e4 LT |
1368 | return addr; |
1369 | } | |
9f9354b9 | 1370 | EXPORT_SYMBOL(inet_select_addr); |
1da177e4 | 1371 | |
60cad5da AV |
1372 | static __be32 confirm_addr_indev(struct in_device *in_dev, __be32 dst, |
1373 | __be32 local, int scope) | |
1da177e4 | 1374 | { |
650638a7 | 1375 | unsigned char localnet_scope = RT_SCOPE_HOST; |
ef11db33 | 1376 | const struct in_ifaddr *ifa; |
a144ea4b | 1377 | __be32 addr = 0; |
ef11db33 | 1378 | int same = 0; |
1da177e4 | 1379 | |
650638a7 SL |
1380 | if (unlikely(IN_DEV_ROUTE_LOCALNET(in_dev))) |
1381 | localnet_scope = RT_SCOPE_LINK; | |
1382 | ||
ef11db33 | 1383 | in_dev_for_each_ifa_rcu(ifa, in_dev) { |
650638a7 SL |
1384 | unsigned char min_scope = min(ifa->ifa_scope, localnet_scope); |
1385 | ||
1da177e4 LT |
1386 | if (!addr && |
1387 | (local == ifa->ifa_local || !local) && | |
650638a7 | 1388 | min_scope <= scope) { |
1da177e4 LT |
1389 | addr = ifa->ifa_local; |
1390 | if (same) | |
1391 | break; | |
1392 | } | |
1393 | if (!same) { | |
1394 | same = (!local || inet_ifa_match(local, ifa)) && | |
1395 | (!dst || inet_ifa_match(dst, ifa)); | |
1396 | if (same && addr) { | |
1397 | if (local || !dst) | |
1398 | break; | |
1399 | /* Is the selected addr into dst subnet? */ | |
1400 | if (inet_ifa_match(addr, ifa)) | |
1401 | break; | |
1402 | /* No, then can we use new local src? */ | |
650638a7 | 1403 | if (min_scope <= scope) { |
1da177e4 LT |
1404 | addr = ifa->ifa_local; |
1405 | break; | |
1406 | } | |
1407 | /* search for large dst subnet for addr */ | |
1408 | same = 0; | |
1409 | } | |
1410 | } | |
ef11db33 | 1411 | } |
1da177e4 | 1412 | |
9f9354b9 | 1413 | return same ? addr : 0; |
1da177e4 LT |
1414 | } |
1415 | ||
1416 | /* | |
1417 | * Confirm that local IP address exists using wildcards: | |
b601fa19 ND |
1418 | * - net: netns to check, cannot be NULL |
1419 | * - in_dev: only on this interface, NULL=any interface | |
1da177e4 LT |
1420 | * - dst: only in the same subnet as dst, 0=any dst |
1421 | * - local: address, 0=autoselect the local address | |
1422 | * - scope: maximum allowed scope value for the local address | |
1423 | */ | |
b601fa19 | 1424 | __be32 inet_confirm_addr(struct net *net, struct in_device *in_dev, |
9bd85e32 | 1425 | __be32 dst, __be32 local, int scope) |
1da177e4 | 1426 | { |
60cad5da | 1427 | __be32 addr = 0; |
9bd85e32 | 1428 | struct net_device *dev; |
1da177e4 | 1429 | |
00db4124 | 1430 | if (in_dev) |
9bd85e32 | 1431 | return confirm_addr_indev(in_dev, dst, local, scope); |
1da177e4 | 1432 | |
1da177e4 | 1433 | rcu_read_lock(); |
c6d14c84 | 1434 | for_each_netdev_rcu(net, dev) { |
9f9354b9 ED |
1435 | in_dev = __in_dev_get_rcu(dev); |
1436 | if (in_dev) { | |
1da177e4 LT |
1437 | addr = confirm_addr_indev(in_dev, dst, local, scope); |
1438 | if (addr) | |
1439 | break; | |
1440 | } | |
1441 | } | |
1442 | rcu_read_unlock(); | |
1da177e4 LT |
1443 | |
1444 | return addr; | |
1445 | } | |
eaddcd76 | 1446 | EXPORT_SYMBOL(inet_confirm_addr); |
1da177e4 LT |
1447 | |
1448 | /* | |
1449 | * Device notifier | |
1450 | */ | |
1451 | ||
1452 | int register_inetaddr_notifier(struct notifier_block *nb) | |
1453 | { | |
e041c683 | 1454 | return blocking_notifier_chain_register(&inetaddr_chain, nb); |
1da177e4 | 1455 | } |
9f9354b9 | 1456 | EXPORT_SYMBOL(register_inetaddr_notifier); |
1da177e4 LT |
1457 | |
1458 | int unregister_inetaddr_notifier(struct notifier_block *nb) | |
1459 | { | |
e041c683 | 1460 | return blocking_notifier_chain_unregister(&inetaddr_chain, nb); |
1da177e4 | 1461 | } |
9f9354b9 | 1462 | EXPORT_SYMBOL(unregister_inetaddr_notifier); |
1da177e4 | 1463 | |
3ad7d246 KJ |
1464 | int register_inetaddr_validator_notifier(struct notifier_block *nb) |
1465 | { | |
1466 | return blocking_notifier_chain_register(&inetaddr_validator_chain, nb); | |
1467 | } | |
1468 | EXPORT_SYMBOL(register_inetaddr_validator_notifier); | |
1469 | ||
1470 | int unregister_inetaddr_validator_notifier(struct notifier_block *nb) | |
1471 | { | |
1472 | return blocking_notifier_chain_unregister(&inetaddr_validator_chain, | |
1473 | nb); | |
1474 | } | |
1475 | EXPORT_SYMBOL(unregister_inetaddr_validator_notifier); | |
1476 | ||
9f9354b9 ED |
1477 | /* Rename ifa_labels for a device name change. Make some effort to preserve |
1478 | * existing alias numbering and to create unique labels if possible. | |
1da177e4 LT |
1479 | */ |
1480 | static void inetdev_changename(struct net_device *dev, struct in_device *in_dev) | |
e905a9ed | 1481 | { |
1da177e4 LT |
1482 | struct in_ifaddr *ifa; |
1483 | int named = 0; | |
1484 | ||
ef11db33 | 1485 | in_dev_for_each_ifa_rtnl(ifa, in_dev) { |
e905a9ed | 1486 | char old[IFNAMSIZ], *dot; |
1da177e4 LT |
1487 | |
1488 | memcpy(old, ifa->ifa_label, IFNAMSIZ); | |
e905a9ed | 1489 | memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); |
1da177e4 | 1490 | if (named++ == 0) |
573bf470 | 1491 | goto skip; |
44344b2a | 1492 | dot = strchr(old, ':'); |
51456b29 | 1493 | if (!dot) { |
e905a9ed | 1494 | sprintf(old, ":%d", named); |
1da177e4 LT |
1495 | dot = old; |
1496 | } | |
9f9354b9 | 1497 | if (strlen(dot) + strlen(dev->name) < IFNAMSIZ) |
e905a9ed | 1498 | strcat(ifa->ifa_label, dot); |
9f9354b9 | 1499 | else |
e905a9ed | 1500 | strcpy(ifa->ifa_label + (IFNAMSIZ - strlen(dot) - 1), dot); |
573bf470 TG |
1501 | skip: |
1502 | rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0); | |
e905a9ed YH |
1503 | } |
1504 | } | |
1da177e4 | 1505 | |
d11327ad IC |
1506 | static void inetdev_send_gratuitous_arp(struct net_device *dev, |
1507 | struct in_device *in_dev) | |
1508 | ||
1509 | { | |
ef11db33 | 1510 | const struct in_ifaddr *ifa; |
d11327ad | 1511 | |
ef11db33 | 1512 | in_dev_for_each_ifa_rtnl(ifa, in_dev) { |
b76d0789 ZK |
1513 | arp_send(ARPOP_REQUEST, ETH_P_ARP, |
1514 | ifa->ifa_local, dev, | |
1515 | ifa->ifa_local, NULL, | |
1516 | dev->dev_addr, NULL); | |
1517 | } | |
d11327ad IC |
1518 | } |
1519 | ||
1da177e4 LT |
1520 | /* Called only under RTNL semaphore */ |
1521 | ||
1522 | static int inetdev_event(struct notifier_block *this, unsigned long event, | |
1523 | void *ptr) | |
1524 | { | |
351638e7 | 1525 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
748e2d93 | 1526 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
0115e8e3 | 1527 | |
1da177e4 LT |
1528 | ASSERT_RTNL(); |
1529 | ||
1530 | if (!in_dev) { | |
8030f544 | 1531 | if (event == NETDEV_REGISTER) { |
1da177e4 | 1532 | in_dev = inetdev_init(dev); |
20e61da7 WC |
1533 | if (IS_ERR(in_dev)) |
1534 | return notifier_from_errno(PTR_ERR(in_dev)); | |
0cc217e1 | 1535 | if (dev->flags & IFF_LOOPBACK) { |
42f811b8 HX |
1536 | IN_DEV_CONF_SET(in_dev, NOXFRM, 1); |
1537 | IN_DEV_CONF_SET(in_dev, NOPOLICY, 1); | |
8030f544 | 1538 | } |
06770843 BL |
1539 | } else if (event == NETDEV_CHANGEMTU) { |
1540 | /* Re-enabling IP */ | |
1541 | if (inetdev_valid_mtu(dev->mtu)) | |
1542 | in_dev = inetdev_init(dev); | |
1da177e4 LT |
1543 | } |
1544 | goto out; | |
1545 | } | |
1546 | ||
1547 | switch (event) { | |
1548 | case NETDEV_REGISTER: | |
91df42be | 1549 | pr_debug("%s: bug\n", __func__); |
a9b3cd7f | 1550 | RCU_INIT_POINTER(dev->ip_ptr, NULL); |
1da177e4 LT |
1551 | break; |
1552 | case NETDEV_UP: | |
06770843 | 1553 | if (!inetdev_valid_mtu(dev->mtu)) |
1da177e4 | 1554 | break; |
0cc217e1 | 1555 | if (dev->flags & IFF_LOOPBACK) { |
9f9354b9 ED |
1556 | struct in_ifaddr *ifa = inet_alloc_ifa(); |
1557 | ||
1558 | if (ifa) { | |
fd23c3b3 | 1559 | INIT_HLIST_NODE(&ifa->hash); |
1da177e4 LT |
1560 | ifa->ifa_local = |
1561 | ifa->ifa_address = htonl(INADDR_LOOPBACK); | |
1562 | ifa->ifa_prefixlen = 8; | |
1563 | ifa->ifa_mask = inet_make_mask(8); | |
1564 | in_dev_hold(in_dev); | |
1565 | ifa->ifa_dev = in_dev; | |
1566 | ifa->ifa_scope = RT_SCOPE_HOST; | |
1567 | memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); | |
5c766d64 JP |
1568 | set_ifa_lifetime(ifa, INFINITY_LIFE_TIME, |
1569 | INFINITY_LIFE_TIME); | |
dfd1582d JP |
1570 | ipv4_devconf_setall(in_dev); |
1571 | neigh_parms_data_state_setall(in_dev->arp_parms); | |
1da177e4 LT |
1572 | inet_insert_ifa(ifa); |
1573 | } | |
1574 | } | |
1575 | ip_mc_up(in_dev); | |
a8eceea8 | 1576 | fallthrough; |
eefef1cf | 1577 | case NETDEV_CHANGEADDR: |
d11327ad IC |
1578 | if (!IN_DEV_ARP_NOTIFY(in_dev)) |
1579 | break; | |
a8eceea8 | 1580 | fallthrough; |
d11327ad | 1581 | case NETDEV_NOTIFY_PEERS: |
a21090cf | 1582 | /* Send gratuitous ARP to notify of link change */ |
d11327ad | 1583 | inetdev_send_gratuitous_arp(dev, in_dev); |
1da177e4 LT |
1584 | break; |
1585 | case NETDEV_DOWN: | |
1586 | ip_mc_down(in_dev); | |
1587 | break; | |
93d9b7d7 | 1588 | case NETDEV_PRE_TYPE_CHANGE: |
75c78500 MS |
1589 | ip_mc_unmap(in_dev); |
1590 | break; | |
93d9b7d7 | 1591 | case NETDEV_POST_TYPE_CHANGE: |
75c78500 MS |
1592 | ip_mc_remap(in_dev); |
1593 | break; | |
1da177e4 | 1594 | case NETDEV_CHANGEMTU: |
06770843 | 1595 | if (inetdev_valid_mtu(dev->mtu)) |
1da177e4 | 1596 | break; |
06770843 | 1597 | /* disable IP when MTU is not enough */ |
a8eceea8 | 1598 | fallthrough; |
1da177e4 LT |
1599 | case NETDEV_UNREGISTER: |
1600 | inetdev_destroy(in_dev); | |
1601 | break; | |
1602 | case NETDEV_CHANGENAME: | |
1603 | /* Do not notify about label change, this event is | |
1604 | * not interesting to applications using netlink. | |
1605 | */ | |
1606 | inetdev_changename(dev, in_dev); | |
1607 | ||
51602b2a | 1608 | devinet_sysctl_unregister(in_dev); |
66f27a52 | 1609 | devinet_sysctl_register(in_dev); |
1da177e4 LT |
1610 | break; |
1611 | } | |
1612 | out: | |
1613 | return NOTIFY_DONE; | |
1614 | } | |
1615 | ||
1616 | static struct notifier_block ip_netdev_notifier = { | |
539afedf | 1617 | .notifier_call = inetdev_event, |
1da177e4 LT |
1618 | }; |
1619 | ||
40384999 | 1620 | static size_t inet_nlmsg_size(void) |
339bf98f TG |
1621 | { |
1622 | return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) | |
1623 | + nla_total_size(4) /* IFA_ADDRESS */ | |
1624 | + nla_total_size(4) /* IFA_LOCAL */ | |
1625 | + nla_total_size(4) /* IFA_BROADCAST */ | |
ad6c8135 | 1626 | + nla_total_size(IFNAMSIZ) /* IFA_LABEL */ |
63b5f152 | 1627 | + nla_total_size(4) /* IFA_FLAGS */ |
af4d768a | 1628 | + nla_total_size(4) /* IFA_RT_PRIORITY */ |
63b5f152 | 1629 | + nla_total_size(sizeof(struct ifa_cacheinfo)); /* IFA_CACHEINFO */ |
339bf98f TG |
1630 | } |
1631 | ||
5c766d64 JP |
1632 | static inline u32 cstamp_delta(unsigned long cstamp) |
1633 | { | |
1634 | return (cstamp - INITIAL_JIFFIES) * 100UL / HZ; | |
1635 | } | |
1636 | ||
1637 | static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, | |
1638 | unsigned long tstamp, u32 preferred, u32 valid) | |
1639 | { | |
1640 | struct ifa_cacheinfo ci; | |
1641 | ||
1642 | ci.cstamp = cstamp_delta(cstamp); | |
1643 | ci.tstamp = cstamp_delta(tstamp); | |
1644 | ci.ifa_prefered = preferred; | |
1645 | ci.ifa_valid = valid; | |
1646 | ||
1647 | return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); | |
1648 | } | |
1649 | ||
1da177e4 | 1650 | static int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa, |
978a46fa | 1651 | struct inet_fill_args *args) |
1da177e4 LT |
1652 | { |
1653 | struct ifaddrmsg *ifm; | |
1654 | struct nlmsghdr *nlh; | |
5c766d64 | 1655 | u32 preferred, valid; |
1da177e4 | 1656 | |
978a46fa CB |
1657 | nlh = nlmsg_put(skb, args->portid, args->seq, args->event, sizeof(*ifm), |
1658 | args->flags); | |
51456b29 | 1659 | if (!nlh) |
26932566 | 1660 | return -EMSGSIZE; |
47f68512 TG |
1661 | |
1662 | ifm = nlmsg_data(nlh); | |
1da177e4 LT |
1663 | ifm->ifa_family = AF_INET; |
1664 | ifm->ifa_prefixlen = ifa->ifa_prefixlen; | |
5c766d64 | 1665 | ifm->ifa_flags = ifa->ifa_flags; |
1da177e4 LT |
1666 | ifm->ifa_scope = ifa->ifa_scope; |
1667 | ifm->ifa_index = ifa->ifa_dev->dev->ifindex; | |
47f68512 | 1668 | |
978a46fa CB |
1669 | if (args->netnsid >= 0 && |
1670 | nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) | |
d3807145 CB |
1671 | goto nla_put_failure; |
1672 | ||
5c766d64 JP |
1673 | if (!(ifm->ifa_flags & IFA_F_PERMANENT)) { |
1674 | preferred = ifa->ifa_preferred_lft; | |
1675 | valid = ifa->ifa_valid_lft; | |
1676 | if (preferred != INFINITY_LIFE_TIME) { | |
1677 | long tval = (jiffies - ifa->ifa_tstamp) / HZ; | |
1678 | ||
1679 | if (preferred > tval) | |
1680 | preferred -= tval; | |
1681 | else | |
1682 | preferred = 0; | |
1683 | if (valid != INFINITY_LIFE_TIME) { | |
1684 | if (valid > tval) | |
1685 | valid -= tval; | |
1686 | else | |
1687 | valid = 0; | |
1688 | } | |
1689 | } | |
1690 | } else { | |
1691 | preferred = INFINITY_LIFE_TIME; | |
1692 | valid = INFINITY_LIFE_TIME; | |
1693 | } | |
f3756b79 | 1694 | if ((ifa->ifa_address && |
930345ea | 1695 | nla_put_in_addr(skb, IFA_ADDRESS, ifa->ifa_address)) || |
f3756b79 | 1696 | (ifa->ifa_local && |
930345ea | 1697 | nla_put_in_addr(skb, IFA_LOCAL, ifa->ifa_local)) || |
f3756b79 | 1698 | (ifa->ifa_broadcast && |
930345ea | 1699 | nla_put_in_addr(skb, IFA_BROADCAST, ifa->ifa_broadcast)) || |
f3756b79 | 1700 | (ifa->ifa_label[0] && |
5c766d64 | 1701 | nla_put_string(skb, IFA_LABEL, ifa->ifa_label)) || |
ad6c8135 | 1702 | nla_put_u32(skb, IFA_FLAGS, ifa->ifa_flags) || |
af4d768a DA |
1703 | (ifa->ifa_rt_priority && |
1704 | nla_put_u32(skb, IFA_RT_PRIORITY, ifa->ifa_rt_priority)) || | |
5c766d64 JP |
1705 | put_cacheinfo(skb, ifa->ifa_cstamp, ifa->ifa_tstamp, |
1706 | preferred, valid)) | |
f3756b79 | 1707 | goto nla_put_failure; |
1da177e4 | 1708 | |
053c095a JB |
1709 | nlmsg_end(skb, nlh); |
1710 | return 0; | |
47f68512 TG |
1711 | |
1712 | nla_put_failure: | |
26932566 PM |
1713 | nlmsg_cancel(skb, nlh); |
1714 | return -EMSGSIZE; | |
1da177e4 LT |
1715 | } |
1716 | ||
c33078e3 DA |
1717 | static int inet_valid_dump_ifaddr_req(const struct nlmsghdr *nlh, |
1718 | struct inet_fill_args *fillargs, | |
1719 | struct net **tgt_net, struct sock *sk, | |
5fcd266a | 1720 | struct netlink_callback *cb) |
c33078e3 | 1721 | { |
5fcd266a | 1722 | struct netlink_ext_ack *extack = cb->extack; |
c33078e3 DA |
1723 | struct nlattr *tb[IFA_MAX+1]; |
1724 | struct ifaddrmsg *ifm; | |
1725 | int err, i; | |
1726 | ||
1727 | if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { | |
1728 | NL_SET_ERR_MSG(extack, "ipv4: Invalid header for address dump request"); | |
1729 | return -EINVAL; | |
1730 | } | |
1731 | ||
1732 | ifm = nlmsg_data(nlh); | |
1733 | if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) { | |
1734 | NL_SET_ERR_MSG(extack, "ipv4: Invalid values in header for address dump request"); | |
1735 | return -EINVAL; | |
1736 | } | |
5fcd266a DA |
1737 | |
1738 | fillargs->ifindex = ifm->ifa_index; | |
1739 | if (fillargs->ifindex) { | |
1740 | cb->answer_flags |= NLM_F_DUMP_FILTERED; | |
1741 | fillargs->flags |= NLM_F_DUMP_FILTERED; | |
c33078e3 DA |
1742 | } |
1743 | ||
8cb08174 JB |
1744 | err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX, |
1745 | ifa_ipv4_policy, extack); | |
c33078e3 DA |
1746 | if (err < 0) |
1747 | return err; | |
1748 | ||
1749 | for (i = 0; i <= IFA_MAX; ++i) { | |
1750 | if (!tb[i]) | |
1751 | continue; | |
1752 | ||
1753 | if (i == IFA_TARGET_NETNSID) { | |
1754 | struct net *net; | |
1755 | ||
1756 | fillargs->netnsid = nla_get_s32(tb[i]); | |
1757 | ||
1758 | net = rtnl_get_net_ns_capable(sk, fillargs->netnsid); | |
1759 | if (IS_ERR(net)) { | |
bf4cc40e | 1760 | fillargs->netnsid = -1; |
c33078e3 DA |
1761 | NL_SET_ERR_MSG(extack, "ipv4: Invalid target network namespace id"); |
1762 | return PTR_ERR(net); | |
1763 | } | |
1764 | *tgt_net = net; | |
1765 | } else { | |
1766 | NL_SET_ERR_MSG(extack, "ipv4: Unsupported attribute in dump request"); | |
1767 | return -EINVAL; | |
1768 | } | |
1769 | } | |
1770 | ||
1771 | return 0; | |
1772 | } | |
1773 | ||
1c98eca4 DA |
1774 | static int in_dev_dump_addr(struct in_device *in_dev, struct sk_buff *skb, |
1775 | struct netlink_callback *cb, int s_ip_idx, | |
1776 | struct inet_fill_args *fillargs) | |
1777 | { | |
1778 | struct in_ifaddr *ifa; | |
1779 | int ip_idx = 0; | |
1780 | int err; | |
1781 | ||
d3e6e285 | 1782 | in_dev_for_each_ifa_rtnl(ifa, in_dev) { |
ef11db33 FW |
1783 | if (ip_idx < s_ip_idx) { |
1784 | ip_idx++; | |
1c98eca4 | 1785 | continue; |
ef11db33 | 1786 | } |
1c98eca4 DA |
1787 | err = inet_fill_ifaddr(skb, ifa, fillargs); |
1788 | if (err < 0) | |
1789 | goto done; | |
1790 | ||
1791 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); | |
ef11db33 | 1792 | ip_idx++; |
1c98eca4 DA |
1793 | } |
1794 | err = 0; | |
1795 | ||
1796 | done: | |
1797 | cb->args[2] = ip_idx; | |
1798 | ||
1799 | return err; | |
1800 | } | |
1801 | ||
1da177e4 LT |
1802 | static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) |
1803 | { | |
c33078e3 | 1804 | const struct nlmsghdr *nlh = cb->nlh; |
978a46fa CB |
1805 | struct inet_fill_args fillargs = { |
1806 | .portid = NETLINK_CB(cb->skb).portid, | |
c33078e3 | 1807 | .seq = nlh->nlmsg_seq, |
978a46fa CB |
1808 | .event = RTM_NEWADDR, |
1809 | .flags = NLM_F_MULTI, | |
1810 | .netnsid = -1, | |
1811 | }; | |
3b1e0a65 | 1812 | struct net *net = sock_net(skb->sk); |
d3807145 | 1813 | struct net *tgt_net = net; |
eec4df98 ED |
1814 | int h, s_h; |
1815 | int idx, s_idx; | |
1c98eca4 | 1816 | int s_ip_idx; |
1da177e4 LT |
1817 | struct net_device *dev; |
1818 | struct in_device *in_dev; | |
eec4df98 | 1819 | struct hlist_head *head; |
d7e38611 | 1820 | int err = 0; |
1da177e4 | 1821 | |
eec4df98 ED |
1822 | s_h = cb->args[0]; |
1823 | s_idx = idx = cb->args[1]; | |
1c98eca4 | 1824 | s_ip_idx = cb->args[2]; |
eec4df98 | 1825 | |
c33078e3 | 1826 | if (cb->strict_check) { |
c33078e3 | 1827 | err = inet_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net, |
5fcd266a | 1828 | skb->sk, cb); |
c33078e3 | 1829 | if (err < 0) |
d7e38611 | 1830 | goto put_tgt_net; |
5fcd266a | 1831 | |
d7e38611 | 1832 | err = 0; |
5fcd266a DA |
1833 | if (fillargs.ifindex) { |
1834 | dev = __dev_get_by_index(tgt_net, fillargs.ifindex); | |
d7e38611 DA |
1835 | if (!dev) { |
1836 | err = -ENODEV; | |
1837 | goto put_tgt_net; | |
1838 | } | |
5fcd266a DA |
1839 | |
1840 | in_dev = __in_dev_get_rtnl(dev); | |
1841 | if (in_dev) { | |
1842 | err = in_dev_dump_addr(in_dev, skb, cb, s_ip_idx, | |
1843 | &fillargs); | |
1844 | } | |
1845 | goto put_tgt_net; | |
1846 | } | |
d3807145 CB |
1847 | } |
1848 | ||
eec4df98 ED |
1849 | for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { |
1850 | idx = 0; | |
d3807145 | 1851 | head = &tgt_net->dev_index_head[h]; |
eec4df98 | 1852 | rcu_read_lock(); |
d3807145 CB |
1853 | cb->seq = atomic_read(&tgt_net->ipv4.dev_addr_genid) ^ |
1854 | tgt_net->dev_base_seq; | |
b67bfe0d | 1855 | hlist_for_each_entry_rcu(dev, head, index_hlist) { |
eec4df98 ED |
1856 | if (idx < s_idx) |
1857 | goto cont; | |
4b97efdf | 1858 | if (h > s_h || idx > s_idx) |
eec4df98 ED |
1859 | s_ip_idx = 0; |
1860 | in_dev = __in_dev_get_rcu(dev); | |
1861 | if (!in_dev) | |
1862 | goto cont; | |
1da177e4 | 1863 | |
1c98eca4 DA |
1864 | err = in_dev_dump_addr(in_dev, skb, cb, s_ip_idx, |
1865 | &fillargs); | |
1866 | if (err < 0) { | |
1867 | rcu_read_unlock(); | |
1868 | goto done; | |
eec4df98 | 1869 | } |
7562f876 | 1870 | cont: |
eec4df98 ED |
1871 | idx++; |
1872 | } | |
1873 | rcu_read_unlock(); | |
1da177e4 LT |
1874 | } |
1875 | ||
1876 | done: | |
eec4df98 ED |
1877 | cb->args[0] = h; |
1878 | cb->args[1] = idx; | |
5fcd266a | 1879 | put_tgt_net: |
978a46fa | 1880 | if (fillargs.netnsid >= 0) |
d3807145 | 1881 | put_net(tgt_net); |
1da177e4 | 1882 | |
7c1e8a38 | 1883 | return skb->len ? : err; |
1da177e4 LT |
1884 | } |
1885 | ||
539afedf | 1886 | static void rtmsg_ifa(int event, struct in_ifaddr *ifa, struct nlmsghdr *nlh, |
15e47304 | 1887 | u32 portid) |
1da177e4 | 1888 | { |
978a46fa CB |
1889 | struct inet_fill_args fillargs = { |
1890 | .portid = portid, | |
1891 | .seq = nlh ? nlh->nlmsg_seq : 0, | |
1892 | .event = event, | |
1893 | .flags = 0, | |
1894 | .netnsid = -1, | |
1895 | }; | |
47f68512 | 1896 | struct sk_buff *skb; |
d6062cbb | 1897 | int err = -ENOBUFS; |
4b8aa9ab | 1898 | struct net *net; |
1da177e4 | 1899 | |
c346dca1 | 1900 | net = dev_net(ifa->ifa_dev->dev); |
339bf98f | 1901 | skb = nlmsg_new(inet_nlmsg_size(), GFP_KERNEL); |
51456b29 | 1902 | if (!skb) |
d6062cbb TG |
1903 | goto errout; |
1904 | ||
978a46fa | 1905 | err = inet_fill_ifaddr(skb, ifa, &fillargs); |
26932566 PM |
1906 | if (err < 0) { |
1907 | /* -EMSGSIZE implies BUG in inet_nlmsg_size() */ | |
1908 | WARN_ON(err == -EMSGSIZE); | |
1909 | kfree_skb(skb); | |
1910 | goto errout; | |
1911 | } | |
15e47304 | 1912 | rtnl_notify(skb, net, portid, RTNLGRP_IPV4_IFADDR, nlh, GFP_KERNEL); |
1ce85fe4 | 1913 | return; |
d6062cbb TG |
1914 | errout: |
1915 | if (err < 0) | |
4b8aa9ab | 1916 | rtnl_set_sk_err(net, RTNLGRP_IPV4_IFADDR, err); |
1da177e4 LT |
1917 | } |
1918 | ||
b1974ed0 AR |
1919 | static size_t inet_get_link_af_size(const struct net_device *dev, |
1920 | u32 ext_filter_mask) | |
9f0f7272 | 1921 | { |
1fc19aff | 1922 | struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr); |
9f0f7272 TG |
1923 | |
1924 | if (!in_dev) | |
1925 | return 0; | |
1926 | ||
1927 | return nla_total_size(IPV4_DEVCONF_MAX * 4); /* IFLA_INET_CONF */ | |
1928 | } | |
1929 | ||
d5566fd7 SV |
1930 | static int inet_fill_link_af(struct sk_buff *skb, const struct net_device *dev, |
1931 | u32 ext_filter_mask) | |
9f0f7272 | 1932 | { |
1fc19aff | 1933 | struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr); |
9f0f7272 TG |
1934 | struct nlattr *nla; |
1935 | int i; | |
1936 | ||
1937 | if (!in_dev) | |
1938 | return -ENODATA; | |
1939 | ||
1940 | nla = nla_reserve(skb, IFLA_INET_CONF, IPV4_DEVCONF_MAX * 4); | |
51456b29 | 1941 | if (!nla) |
9f0f7272 TG |
1942 | return -EMSGSIZE; |
1943 | ||
1944 | for (i = 0; i < IPV4_DEVCONF_MAX; i++) | |
1945 | ((u32 *) nla_data(nla))[i] = in_dev->cnf.data[i]; | |
1946 | ||
1947 | return 0; | |
1948 | } | |
1949 | ||
1950 | static const struct nla_policy inet_af_policy[IFLA_INET_MAX+1] = { | |
1951 | [IFLA_INET_CONF] = { .type = NLA_NESTED }, | |
1952 | }; | |
1953 | ||
cf7afbfe | 1954 | static int inet_validate_link_af(const struct net_device *dev, |
8679c31e RY |
1955 | const struct nlattr *nla, |
1956 | struct netlink_ext_ack *extack) | |
9f0f7272 | 1957 | { |
9f0f7272 TG |
1958 | struct nlattr *a, *tb[IFLA_INET_MAX+1]; |
1959 | int err, rem; | |
1960 | ||
a100243d | 1961 | if (dev && !__in_dev_get_rtnl(dev)) |
cf7afbfe | 1962 | return -EAFNOSUPPORT; |
9f0f7272 | 1963 | |
8cb08174 | 1964 | err = nla_parse_nested_deprecated(tb, IFLA_INET_MAX, nla, |
8679c31e | 1965 | inet_af_policy, extack); |
9f0f7272 TG |
1966 | if (err < 0) |
1967 | return err; | |
1968 | ||
1969 | if (tb[IFLA_INET_CONF]) { | |
1970 | nla_for_each_nested(a, tb[IFLA_INET_CONF], rem) { | |
1971 | int cfgid = nla_type(a); | |
1972 | ||
1973 | if (nla_len(a) < 4) | |
1974 | return -EINVAL; | |
1975 | ||
1976 | if (cfgid <= 0 || cfgid > IPV4_DEVCONF_MAX) | |
1977 | return -EINVAL; | |
1978 | } | |
1979 | } | |
1980 | ||
cf7afbfe TG |
1981 | return 0; |
1982 | } | |
1983 | ||
3583a4e8 SH |
1984 | static int inet_set_link_af(struct net_device *dev, const struct nlattr *nla, |
1985 | struct netlink_ext_ack *extack) | |
cf7afbfe | 1986 | { |
a100243d | 1987 | struct in_device *in_dev = __in_dev_get_rtnl(dev); |
cf7afbfe TG |
1988 | struct nlattr *a, *tb[IFLA_INET_MAX+1]; |
1989 | int rem; | |
1990 | ||
1991 | if (!in_dev) | |
1992 | return -EAFNOSUPPORT; | |
1993 | ||
8cb08174 | 1994 | if (nla_parse_nested_deprecated(tb, IFLA_INET_MAX, nla, NULL, NULL) < 0) |
5ac6b198 | 1995 | return -EINVAL; |
cf7afbfe | 1996 | |
9f0f7272 TG |
1997 | if (tb[IFLA_INET_CONF]) { |
1998 | nla_for_each_nested(a, tb[IFLA_INET_CONF], rem) | |
1999 | ipv4_devconf_set(in_dev, nla_type(a), nla_get_u32(a)); | |
2000 | } | |
2001 | ||
2002 | return 0; | |
2003 | } | |
2004 | ||
edc9e748 ND |
2005 | static int inet_netconf_msgsize_devconf(int type) |
2006 | { | |
2007 | int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) | |
2008 | + nla_total_size(4); /* NETCONFA_IFINDEX */ | |
136ba622 | 2009 | bool all = false; |
edc9e748 | 2010 | |
136ba622 ZS |
2011 | if (type == NETCONFA_ALL) |
2012 | all = true; | |
2013 | ||
2014 | if (all || type == NETCONFA_FORWARDING) | |
edc9e748 | 2015 | size += nla_total_size(4); |
136ba622 | 2016 | if (all || type == NETCONFA_RP_FILTER) |
cc535dfb | 2017 | size += nla_total_size(4); |
136ba622 | 2018 | if (all || type == NETCONFA_MC_FORWARDING) |
d67b8c61 | 2019 | size += nla_total_size(4); |
5cbf777c XL |
2020 | if (all || type == NETCONFA_BC_FORWARDING) |
2021 | size += nla_total_size(4); | |
136ba622 | 2022 | if (all || type == NETCONFA_PROXY_NEIGH) |
f085ff1c | 2023 | size += nla_total_size(4); |
136ba622 | 2024 | if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) |
974d7af5 | 2025 | size += nla_total_size(4); |
edc9e748 ND |
2026 | |
2027 | return size; | |
2028 | } | |
2029 | ||
2030 | static int inet_netconf_fill_devconf(struct sk_buff *skb, int ifindex, | |
2031 | struct ipv4_devconf *devconf, u32 portid, | |
2032 | u32 seq, int event, unsigned int flags, | |
2033 | int type) | |
2034 | { | |
2035 | struct nlmsghdr *nlh; | |
2036 | struct netconfmsg *ncm; | |
136ba622 | 2037 | bool all = false; |
edc9e748 ND |
2038 | |
2039 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), | |
2040 | flags); | |
51456b29 | 2041 | if (!nlh) |
edc9e748 ND |
2042 | return -EMSGSIZE; |
2043 | ||
136ba622 ZS |
2044 | if (type == NETCONFA_ALL) |
2045 | all = true; | |
2046 | ||
edc9e748 ND |
2047 | ncm = nlmsg_data(nlh); |
2048 | ncm->ncm_family = AF_INET; | |
2049 | ||
2050 | if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0) | |
2051 | goto nla_put_failure; | |
2052 | ||
b5c9641d DA |
2053 | if (!devconf) |
2054 | goto out; | |
2055 | ||
136ba622 | 2056 | if ((all || type == NETCONFA_FORWARDING) && |
edc9e748 ND |
2057 | nla_put_s32(skb, NETCONFA_FORWARDING, |
2058 | IPV4_DEVCONF(*devconf, FORWARDING)) < 0) | |
2059 | goto nla_put_failure; | |
136ba622 | 2060 | if ((all || type == NETCONFA_RP_FILTER) && |
cc535dfb ND |
2061 | nla_put_s32(skb, NETCONFA_RP_FILTER, |
2062 | IPV4_DEVCONF(*devconf, RP_FILTER)) < 0) | |
2063 | goto nla_put_failure; | |
136ba622 | 2064 | if ((all || type == NETCONFA_MC_FORWARDING) && |
d67b8c61 ND |
2065 | nla_put_s32(skb, NETCONFA_MC_FORWARDING, |
2066 | IPV4_DEVCONF(*devconf, MC_FORWARDING)) < 0) | |
2067 | goto nla_put_failure; | |
5cbf777c XL |
2068 | if ((all || type == NETCONFA_BC_FORWARDING) && |
2069 | nla_put_s32(skb, NETCONFA_BC_FORWARDING, | |
2070 | IPV4_DEVCONF(*devconf, BC_FORWARDING)) < 0) | |
2071 | goto nla_put_failure; | |
136ba622 | 2072 | if ((all || type == NETCONFA_PROXY_NEIGH) && |
09aea5df | 2073 | nla_put_s32(skb, NETCONFA_PROXY_NEIGH, |
f085ff1c | 2074 | IPV4_DEVCONF(*devconf, PROXY_ARP)) < 0) |
2075 | goto nla_put_failure; | |
136ba622 | 2076 | if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) && |
974d7af5 AG |
2077 | nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, |
2078 | IPV4_DEVCONF(*devconf, IGNORE_ROUTES_WITH_LINKDOWN)) < 0) | |
2079 | goto nla_put_failure; | |
edc9e748 | 2080 | |
b5c9641d | 2081 | out: |
053c095a JB |
2082 | nlmsg_end(skb, nlh); |
2083 | return 0; | |
edc9e748 ND |
2084 | |
2085 | nla_put_failure: | |
2086 | nlmsg_cancel(skb, nlh); | |
2087 | return -EMSGSIZE; | |
2088 | } | |
2089 | ||
3b022865 DA |
2090 | void inet_netconf_notify_devconf(struct net *net, int event, int type, |
2091 | int ifindex, struct ipv4_devconf *devconf) | |
edc9e748 ND |
2092 | { |
2093 | struct sk_buff *skb; | |
2094 | int err = -ENOBUFS; | |
2095 | ||
fa17806c | 2096 | skb = nlmsg_new(inet_netconf_msgsize_devconf(type), GFP_KERNEL); |
51456b29 | 2097 | if (!skb) |
edc9e748 ND |
2098 | goto errout; |
2099 | ||
2100 | err = inet_netconf_fill_devconf(skb, ifindex, devconf, 0, 0, | |
3b022865 | 2101 | event, 0, type); |
edc9e748 ND |
2102 | if (err < 0) { |
2103 | /* -EMSGSIZE implies BUG in inet_netconf_msgsize_devconf() */ | |
2104 | WARN_ON(err == -EMSGSIZE); | |
2105 | kfree_skb(skb); | |
2106 | goto errout; | |
2107 | } | |
fa17806c | 2108 | rtnl_notify(skb, net, 0, RTNLGRP_IPV4_NETCONF, NULL, GFP_KERNEL); |
edc9e748 ND |
2109 | return; |
2110 | errout: | |
2111 | if (err < 0) | |
2112 | rtnl_set_sk_err(net, RTNLGRP_IPV4_NETCONF, err); | |
2113 | } | |
2114 | ||
9e551110 ND |
2115 | static const struct nla_policy devconf_ipv4_policy[NETCONFA_MAX+1] = { |
2116 | [NETCONFA_IFINDEX] = { .len = sizeof(int) }, | |
2117 | [NETCONFA_FORWARDING] = { .len = sizeof(int) }, | |
cc535dfb | 2118 | [NETCONFA_RP_FILTER] = { .len = sizeof(int) }, |
09aea5df | 2119 | [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) }, |
974d7af5 | 2120 | [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) }, |
9e551110 ND |
2121 | }; |
2122 | ||
eede370d JK |
2123 | static int inet_netconf_valid_get_req(struct sk_buff *skb, |
2124 | const struct nlmsghdr *nlh, | |
2125 | struct nlattr **tb, | |
2126 | struct netlink_ext_ack *extack) | |
2127 | { | |
2128 | int i, err; | |
2129 | ||
2130 | if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) { | |
2131 | NL_SET_ERR_MSG(extack, "ipv4: Invalid header for netconf get request"); | |
2132 | return -EINVAL; | |
2133 | } | |
2134 | ||
2135 | if (!netlink_strict_get_check(skb)) | |
8cb08174 JB |
2136 | return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg), |
2137 | tb, NETCONFA_MAX, | |
2138 | devconf_ipv4_policy, extack); | |
eede370d | 2139 | |
8cb08174 JB |
2140 | err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg), |
2141 | tb, NETCONFA_MAX, | |
2142 | devconf_ipv4_policy, extack); | |
eede370d JK |
2143 | if (err) |
2144 | return err; | |
2145 | ||
2146 | for (i = 0; i <= NETCONFA_MAX; i++) { | |
2147 | if (!tb[i]) | |
2148 | continue; | |
2149 | ||
2150 | switch (i) { | |
2151 | case NETCONFA_IFINDEX: | |
2152 | break; | |
2153 | default: | |
2154 | NL_SET_ERR_MSG(extack, "ipv4: Unsupported attribute in netconf get request"); | |
2155 | return -EINVAL; | |
2156 | } | |
2157 | } | |
2158 | ||
2159 | return 0; | |
2160 | } | |
2161 | ||
9e551110 | 2162 | static int inet_netconf_get_devconf(struct sk_buff *in_skb, |
c21ef3e3 DA |
2163 | struct nlmsghdr *nlh, |
2164 | struct netlink_ext_ack *extack) | |
9e551110 ND |
2165 | { |
2166 | struct net *net = sock_net(in_skb->sk); | |
2167 | struct nlattr *tb[NETCONFA_MAX+1]; | |
9e551110 ND |
2168 | struct sk_buff *skb; |
2169 | struct ipv4_devconf *devconf; | |
2170 | struct in_device *in_dev; | |
2171 | struct net_device *dev; | |
2172 | int ifindex; | |
2173 | int err; | |
2174 | ||
eede370d JK |
2175 | err = inet_netconf_valid_get_req(in_skb, nlh, tb, extack); |
2176 | if (err) | |
9e551110 ND |
2177 | goto errout; |
2178 | ||
a97eb33f | 2179 | err = -EINVAL; |
9e551110 ND |
2180 | if (!tb[NETCONFA_IFINDEX]) |
2181 | goto errout; | |
2182 | ||
2183 | ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); | |
2184 | switch (ifindex) { | |
2185 | case NETCONFA_IFINDEX_ALL: | |
2186 | devconf = net->ipv4.devconf_all; | |
2187 | break; | |
2188 | case NETCONFA_IFINDEX_DEFAULT: | |
2189 | devconf = net->ipv4.devconf_dflt; | |
2190 | break; | |
2191 | default: | |
2192 | dev = __dev_get_by_index(net, ifindex); | |
51456b29 | 2193 | if (!dev) |
9e551110 ND |
2194 | goto errout; |
2195 | in_dev = __in_dev_get_rtnl(dev); | |
51456b29 | 2196 | if (!in_dev) |
9e551110 ND |
2197 | goto errout; |
2198 | devconf = &in_dev->cnf; | |
2199 | break; | |
2200 | } | |
2201 | ||
2202 | err = -ENOBUFS; | |
fa17806c | 2203 | skb = nlmsg_new(inet_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL); |
51456b29 | 2204 | if (!skb) |
9e551110 ND |
2205 | goto errout; |
2206 | ||
2207 | err = inet_netconf_fill_devconf(skb, ifindex, devconf, | |
2208 | NETLINK_CB(in_skb).portid, | |
2209 | nlh->nlmsg_seq, RTM_NEWNETCONF, 0, | |
136ba622 | 2210 | NETCONFA_ALL); |
9e551110 ND |
2211 | if (err < 0) { |
2212 | /* -EMSGSIZE implies BUG in inet_netconf_msgsize_devconf() */ | |
2213 | WARN_ON(err == -EMSGSIZE); | |
2214 | kfree_skb(skb); | |
2215 | goto errout; | |
2216 | } | |
2217 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); | |
2218 | errout: | |
2219 | return err; | |
2220 | } | |
2221 | ||
7a674200 ND |
2222 | static int inet_netconf_dump_devconf(struct sk_buff *skb, |
2223 | struct netlink_callback *cb) | |
2224 | { | |
addd383f | 2225 | const struct nlmsghdr *nlh = cb->nlh; |
7a674200 ND |
2226 | struct net *net = sock_net(skb->sk); |
2227 | int h, s_h; | |
2228 | int idx, s_idx; | |
2229 | struct net_device *dev; | |
2230 | struct in_device *in_dev; | |
2231 | struct hlist_head *head; | |
2232 | ||
addd383f DA |
2233 | if (cb->strict_check) { |
2234 | struct netlink_ext_ack *extack = cb->extack; | |
2235 | struct netconfmsg *ncm; | |
2236 | ||
2237 | if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) { | |
2238 | NL_SET_ERR_MSG(extack, "ipv4: Invalid header for netconf dump request"); | |
2239 | return -EINVAL; | |
2240 | } | |
2241 | ||
2242 | if (nlmsg_attrlen(nlh, sizeof(*ncm))) { | |
2243 | NL_SET_ERR_MSG(extack, "ipv4: Invalid data after header in netconf dump request"); | |
2244 | return -EINVAL; | |
2245 | } | |
2246 | } | |
2247 | ||
7a674200 ND |
2248 | s_h = cb->args[0]; |
2249 | s_idx = idx = cb->args[1]; | |
2250 | ||
2251 | for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { | |
2252 | idx = 0; | |
2253 | head = &net->dev_index_head[h]; | |
2254 | rcu_read_lock(); | |
0465277f ND |
2255 | cb->seq = atomic_read(&net->ipv4.dev_addr_genid) ^ |
2256 | net->dev_base_seq; | |
7a674200 ND |
2257 | hlist_for_each_entry_rcu(dev, head, index_hlist) { |
2258 | if (idx < s_idx) | |
2259 | goto cont; | |
2260 | in_dev = __in_dev_get_rcu(dev); | |
2261 | if (!in_dev) | |
2262 | goto cont; | |
2263 | ||
2264 | if (inet_netconf_fill_devconf(skb, dev->ifindex, | |
2265 | &in_dev->cnf, | |
2266 | NETLINK_CB(cb->skb).portid, | |
addd383f | 2267 | nlh->nlmsg_seq, |
7a674200 ND |
2268 | RTM_NEWNETCONF, |
2269 | NLM_F_MULTI, | |
136ba622 | 2270 | NETCONFA_ALL) < 0) { |
7a674200 ND |
2271 | rcu_read_unlock(); |
2272 | goto done; | |
2273 | } | |
0465277f | 2274 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); |
7a674200 ND |
2275 | cont: |
2276 | idx++; | |
2277 | } | |
2278 | rcu_read_unlock(); | |
2279 | } | |
2280 | if (h == NETDEV_HASHENTRIES) { | |
2281 | if (inet_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL, | |
2282 | net->ipv4.devconf_all, | |
2283 | NETLINK_CB(cb->skb).portid, | |
addd383f | 2284 | nlh->nlmsg_seq, |
7a674200 | 2285 | RTM_NEWNETCONF, NLM_F_MULTI, |
136ba622 | 2286 | NETCONFA_ALL) < 0) |
7a674200 ND |
2287 | goto done; |
2288 | else | |
2289 | h++; | |
2290 | } | |
2291 | if (h == NETDEV_HASHENTRIES + 1) { | |
2292 | if (inet_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT, | |
2293 | net->ipv4.devconf_dflt, | |
2294 | NETLINK_CB(cb->skb).portid, | |
addd383f | 2295 | nlh->nlmsg_seq, |
7a674200 | 2296 | RTM_NEWNETCONF, NLM_F_MULTI, |
136ba622 | 2297 | NETCONFA_ALL) < 0) |
7a674200 ND |
2298 | goto done; |
2299 | else | |
2300 | h++; | |
2301 | } | |
2302 | done: | |
2303 | cb->args[0] = h; | |
2304 | cb->args[1] = idx; | |
2305 | ||
2306 | return skb->len; | |
2307 | } | |
2308 | ||
1da177e4 LT |
2309 | #ifdef CONFIG_SYSCTL |
2310 | ||
c0ce9fb3 | 2311 | static void devinet_copy_dflt_conf(struct net *net, int i) |
31be3085 HX |
2312 | { |
2313 | struct net_device *dev; | |
2314 | ||
c6d14c84 ED |
2315 | rcu_read_lock(); |
2316 | for_each_netdev_rcu(net, dev) { | |
31be3085 | 2317 | struct in_device *in_dev; |
c6d14c84 | 2318 | |
31be3085 HX |
2319 | in_dev = __in_dev_get_rcu(dev); |
2320 | if (in_dev && !test_bit(i, in_dev->cnf.state)) | |
9355bbd6 | 2321 | in_dev->cnf.data[i] = net->ipv4.devconf_dflt->data[i]; |
31be3085 | 2322 | } |
c6d14c84 | 2323 | rcu_read_unlock(); |
31be3085 HX |
2324 | } |
2325 | ||
c6d14c84 | 2326 | /* called with RTNL locked */ |
c0ce9fb3 | 2327 | static void inet_forward_change(struct net *net) |
68dd299b PE |
2328 | { |
2329 | struct net_device *dev; | |
586f1211 | 2330 | int on = IPV4_DEVCONF_ALL(net, FORWARDING); |
68dd299b | 2331 | |
586f1211 | 2332 | IPV4_DEVCONF_ALL(net, ACCEPT_REDIRECTS) = !on; |
9355bbd6 | 2333 | IPV4_DEVCONF_DFLT(net, FORWARDING) = on; |
3b022865 DA |
2334 | inet_netconf_notify_devconf(net, RTM_NEWNETCONF, |
2335 | NETCONFA_FORWARDING, | |
edc9e748 ND |
2336 | NETCONFA_IFINDEX_ALL, |
2337 | net->ipv4.devconf_all); | |
3b022865 DA |
2338 | inet_netconf_notify_devconf(net, RTM_NEWNETCONF, |
2339 | NETCONFA_FORWARDING, | |
edc9e748 ND |
2340 | NETCONFA_IFINDEX_DEFAULT, |
2341 | net->ipv4.devconf_dflt); | |
68dd299b | 2342 | |
c0ce9fb3 | 2343 | for_each_netdev(net, dev) { |
68dd299b | 2344 | struct in_device *in_dev; |
fa17806c | 2345 | |
0187bdfb BH |
2346 | if (on) |
2347 | dev_disable_lro(dev); | |
fa17806c ED |
2348 | |
2349 | in_dev = __in_dev_get_rtnl(dev); | |
edc9e748 | 2350 | if (in_dev) { |
68dd299b | 2351 | IN_DEV_CONF_SET(in_dev, FORWARDING, on); |
3b022865 DA |
2352 | inet_netconf_notify_devconf(net, RTM_NEWNETCONF, |
2353 | NETCONFA_FORWARDING, | |
edc9e748 ND |
2354 | dev->ifindex, &in_dev->cnf); |
2355 | } | |
68dd299b | 2356 | } |
68dd299b PE |
2357 | } |
2358 | ||
f085ff1c | 2359 | static int devinet_conf_ifindex(struct net *net, struct ipv4_devconf *cnf) |
2360 | { | |
2361 | if (cnf == net->ipv4.devconf_dflt) | |
2362 | return NETCONFA_IFINDEX_DEFAULT; | |
2363 | else if (cnf == net->ipv4.devconf_all) | |
2364 | return NETCONFA_IFINDEX_ALL; | |
2365 | else { | |
2366 | struct in_device *idev | |
2367 | = container_of(cnf, struct in_device, cnf); | |
2368 | return idev->dev->ifindex; | |
2369 | } | |
2370 | } | |
2371 | ||
fe2c6338 | 2372 | static int devinet_conf_proc(struct ctl_table *ctl, int write, |
32927393 | 2373 | void *buffer, size_t *lenp, loff_t *ppos) |
31be3085 | 2374 | { |
d01ff0a0 | 2375 | int old_value = *(int *)ctl->data; |
8d65af78 | 2376 | int ret = proc_dointvec(ctl, write, buffer, lenp, ppos); |
d01ff0a0 | 2377 | int new_value = *(int *)ctl->data; |
31be3085 HX |
2378 | |
2379 | if (write) { | |
2380 | struct ipv4_devconf *cnf = ctl->extra1; | |
c0ce9fb3 | 2381 | struct net *net = ctl->extra2; |
31be3085 | 2382 | int i = (int *)ctl->data - cnf->data; |
f085ff1c | 2383 | int ifindex; |
31be3085 HX |
2384 | |
2385 | set_bit(i, cnf->state); | |
2386 | ||
9355bbd6 | 2387 | if (cnf == net->ipv4.devconf_dflt) |
c0ce9fb3 | 2388 | devinet_copy_dflt_conf(net, i); |
d0daebc3 TG |
2389 | if (i == IPV4_DEVCONF_ACCEPT_LOCAL - 1 || |
2390 | i == IPV4_DEVCONF_ROUTE_LOCALNET - 1) | |
d01ff0a0 | 2391 | if ((new_value == 0) && (old_value != 0)) |
4ccfe6d4 | 2392 | rt_cache_flush(net); |
f085ff1c | 2393 | |
5cbf777c XL |
2394 | if (i == IPV4_DEVCONF_BC_FORWARDING - 1 && |
2395 | new_value != old_value) | |
2396 | rt_cache_flush(net); | |
2397 | ||
cc535dfb ND |
2398 | if (i == IPV4_DEVCONF_RP_FILTER - 1 && |
2399 | new_value != old_value) { | |
f085ff1c | 2400 | ifindex = devinet_conf_ifindex(net, cnf); |
3b022865 DA |
2401 | inet_netconf_notify_devconf(net, RTM_NEWNETCONF, |
2402 | NETCONFA_RP_FILTER, | |
cc535dfb ND |
2403 | ifindex, cnf); |
2404 | } | |
f085ff1c | 2405 | if (i == IPV4_DEVCONF_PROXY_ARP - 1 && |
2406 | new_value != old_value) { | |
2407 | ifindex = devinet_conf_ifindex(net, cnf); | |
3b022865 DA |
2408 | inet_netconf_notify_devconf(net, RTM_NEWNETCONF, |
2409 | NETCONFA_PROXY_NEIGH, | |
f085ff1c | 2410 | ifindex, cnf); |
2411 | } | |
974d7af5 AG |
2412 | if (i == IPV4_DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN - 1 && |
2413 | new_value != old_value) { | |
2414 | ifindex = devinet_conf_ifindex(net, cnf); | |
3b022865 DA |
2415 | inet_netconf_notify_devconf(net, RTM_NEWNETCONF, |
2416 | NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, | |
974d7af5 AG |
2417 | ifindex, cnf); |
2418 | } | |
31be3085 HX |
2419 | } |
2420 | ||
2421 | return ret; | |
2422 | } | |
2423 | ||
fe2c6338 | 2424 | static int devinet_sysctl_forward(struct ctl_table *ctl, int write, |
32927393 | 2425 | void *buffer, size_t *lenp, loff_t *ppos) |
1da177e4 LT |
2426 | { |
2427 | int *valp = ctl->data; | |
2428 | int val = *valp; | |
88af182e | 2429 | loff_t pos = *ppos; |
8292d7f6 YY |
2430 | struct net *net = ctl->extra2; |
2431 | int ret; | |
1da177e4 | 2432 | |
8292d7f6 YY |
2433 | if (write && !ns_capable(net->user_ns, CAP_NET_ADMIN)) |
2434 | return -EPERM; | |
2435 | ||
2436 | ret = proc_dointvec(ctl, write, buffer, lenp, ppos); | |
c0ce9fb3 | 2437 | |
8292d7f6 | 2438 | if (write && *valp != val) { |
0187bdfb | 2439 | if (valp != &IPV4_DEVCONF_DFLT(net, FORWARDING)) { |
88af182e EB |
2440 | if (!rtnl_trylock()) { |
2441 | /* Restore the original values before restarting */ | |
2442 | *valp = val; | |
2443 | *ppos = pos; | |
9b8adb5e | 2444 | return restart_syscall(); |
88af182e | 2445 | } |
0187bdfb BH |
2446 | if (valp == &IPV4_DEVCONF_ALL(net, FORWARDING)) { |
2447 | inet_forward_change(net); | |
edc9e748 | 2448 | } else { |
0187bdfb BH |
2449 | struct ipv4_devconf *cnf = ctl->extra1; |
2450 | struct in_device *idev = | |
2451 | container_of(cnf, struct in_device, cnf); | |
edc9e748 ND |
2452 | if (*valp) |
2453 | dev_disable_lro(idev->dev); | |
3b022865 | 2454 | inet_netconf_notify_devconf(net, RTM_NEWNETCONF, |
edc9e748 ND |
2455 | NETCONFA_FORWARDING, |
2456 | idev->dev->ifindex, | |
2457 | cnf); | |
0187bdfb BH |
2458 | } |
2459 | rtnl_unlock(); | |
4ccfe6d4 | 2460 | rt_cache_flush(net); |
edc9e748 | 2461 | } else |
3b022865 DA |
2462 | inet_netconf_notify_devconf(net, RTM_NEWNETCONF, |
2463 | NETCONFA_FORWARDING, | |
edc9e748 ND |
2464 | NETCONFA_IFINDEX_DEFAULT, |
2465 | net->ipv4.devconf_dflt); | |
1da177e4 LT |
2466 | } |
2467 | ||
2468 | return ret; | |
2469 | } | |
2470 | ||
fe2c6338 | 2471 | static int ipv4_doint_and_flush(struct ctl_table *ctl, int write, |
32927393 | 2472 | void *buffer, size_t *lenp, loff_t *ppos) |
1da177e4 LT |
2473 | { |
2474 | int *valp = ctl->data; | |
2475 | int val = *valp; | |
8d65af78 | 2476 | int ret = proc_dointvec(ctl, write, buffer, lenp, ppos); |
76e6ebfb | 2477 | struct net *net = ctl->extra2; |
1da177e4 LT |
2478 | |
2479 | if (write && *valp != val) | |
4ccfe6d4 | 2480 | rt_cache_flush(net); |
1da177e4 LT |
2481 | |
2482 | return ret; | |
2483 | } | |
2484 | ||
f8572d8f | 2485 | #define DEVINET_SYSCTL_ENTRY(attr, name, mval, proc) \ |
42f811b8 | 2486 | { \ |
42f811b8 HX |
2487 | .procname = name, \ |
2488 | .data = ipv4_devconf.data + \ | |
02291680 | 2489 | IPV4_DEVCONF_ ## attr - 1, \ |
42f811b8 HX |
2490 | .maxlen = sizeof(int), \ |
2491 | .mode = mval, \ | |
2492 | .proc_handler = proc, \ | |
31be3085 | 2493 | .extra1 = &ipv4_devconf, \ |
42f811b8 HX |
2494 | } |
2495 | ||
2496 | #define DEVINET_SYSCTL_RW_ENTRY(attr, name) \ | |
f8572d8f | 2497 | DEVINET_SYSCTL_ENTRY(attr, name, 0644, devinet_conf_proc) |
42f811b8 HX |
2498 | |
2499 | #define DEVINET_SYSCTL_RO_ENTRY(attr, name) \ | |
f8572d8f | 2500 | DEVINET_SYSCTL_ENTRY(attr, name, 0444, devinet_conf_proc) |
42f811b8 | 2501 | |
f8572d8f EB |
2502 | #define DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, proc) \ |
2503 | DEVINET_SYSCTL_ENTRY(attr, name, 0644, proc) | |
42f811b8 HX |
2504 | |
2505 | #define DEVINET_SYSCTL_FLUSHING_ENTRY(attr, name) \ | |
f8572d8f | 2506 | DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, ipv4_doint_and_flush) |
42f811b8 | 2507 | |
1da177e4 LT |
2508 | static struct devinet_sysctl_table { |
2509 | struct ctl_table_header *sysctl_header; | |
02291680 | 2510 | struct ctl_table devinet_vars[__IPV4_DEVCONF_MAX]; |
1da177e4 LT |
2511 | } devinet_sysctl = { |
2512 | .devinet_vars = { | |
42f811b8 | 2513 | DEVINET_SYSCTL_COMPLEX_ENTRY(FORWARDING, "forwarding", |
f8572d8f | 2514 | devinet_sysctl_forward), |
42f811b8 | 2515 | DEVINET_SYSCTL_RO_ENTRY(MC_FORWARDING, "mc_forwarding"), |
5cbf777c | 2516 | DEVINET_SYSCTL_RW_ENTRY(BC_FORWARDING, "bc_forwarding"), |
42f811b8 HX |
2517 | |
2518 | DEVINET_SYSCTL_RW_ENTRY(ACCEPT_REDIRECTS, "accept_redirects"), | |
2519 | DEVINET_SYSCTL_RW_ENTRY(SECURE_REDIRECTS, "secure_redirects"), | |
2520 | DEVINET_SYSCTL_RW_ENTRY(SHARED_MEDIA, "shared_media"), | |
2521 | DEVINET_SYSCTL_RW_ENTRY(RP_FILTER, "rp_filter"), | |
2522 | DEVINET_SYSCTL_RW_ENTRY(SEND_REDIRECTS, "send_redirects"), | |
2523 | DEVINET_SYSCTL_RW_ENTRY(ACCEPT_SOURCE_ROUTE, | |
2524 | "accept_source_route"), | |
8153a10c | 2525 | DEVINET_SYSCTL_RW_ENTRY(ACCEPT_LOCAL, "accept_local"), |
28f6aeea | 2526 | DEVINET_SYSCTL_RW_ENTRY(SRC_VMARK, "src_valid_mark"), |
42f811b8 HX |
2527 | DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP, "proxy_arp"), |
2528 | DEVINET_SYSCTL_RW_ENTRY(MEDIUM_ID, "medium_id"), | |
2529 | DEVINET_SYSCTL_RW_ENTRY(BOOTP_RELAY, "bootp_relay"), | |
2530 | DEVINET_SYSCTL_RW_ENTRY(LOG_MARTIANS, "log_martians"), | |
2531 | DEVINET_SYSCTL_RW_ENTRY(TAG, "tag"), | |
2532 | DEVINET_SYSCTL_RW_ENTRY(ARPFILTER, "arp_filter"), | |
2533 | DEVINET_SYSCTL_RW_ENTRY(ARP_ANNOUNCE, "arp_announce"), | |
2534 | DEVINET_SYSCTL_RW_ENTRY(ARP_IGNORE, "arp_ignore"), | |
2535 | DEVINET_SYSCTL_RW_ENTRY(ARP_ACCEPT, "arp_accept"), | |
eefef1cf | 2536 | DEVINET_SYSCTL_RW_ENTRY(ARP_NOTIFY, "arp_notify"), |
fcdb44d0 JP |
2537 | DEVINET_SYSCTL_RW_ENTRY(ARP_EVICT_NOCARRIER, |
2538 | "arp_evict_nocarrier"), | |
65324144 | 2539 | DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP_PVLAN, "proxy_arp_pvlan"), |
5c6fe01c WM |
2540 | DEVINET_SYSCTL_RW_ENTRY(FORCE_IGMP_VERSION, |
2541 | "force_igmp_version"), | |
2690048c WM |
2542 | DEVINET_SYSCTL_RW_ENTRY(IGMPV2_UNSOLICITED_REPORT_INTERVAL, |
2543 | "igmpv2_unsolicited_report_interval"), | |
2544 | DEVINET_SYSCTL_RW_ENTRY(IGMPV3_UNSOLICITED_REPORT_INTERVAL, | |
2545 | "igmpv3_unsolicited_report_interval"), | |
0eeb075f AG |
2546 | DEVINET_SYSCTL_RW_ENTRY(IGNORE_ROUTES_WITH_LINKDOWN, |
2547 | "ignore_routes_with_linkdown"), | |
97daf331 JB |
2548 | DEVINET_SYSCTL_RW_ENTRY(DROP_GRATUITOUS_ARP, |
2549 | "drop_gratuitous_arp"), | |
42f811b8 HX |
2550 | |
2551 | DEVINET_SYSCTL_FLUSHING_ENTRY(NOXFRM, "disable_xfrm"), | |
2552 | DEVINET_SYSCTL_FLUSHING_ENTRY(NOPOLICY, "disable_policy"), | |
42f811b8 HX |
2553 | DEVINET_SYSCTL_FLUSHING_ENTRY(PROMOTE_SECONDARIES, |
2554 | "promote_secondaries"), | |
d0daebc3 TG |
2555 | DEVINET_SYSCTL_FLUSHING_ENTRY(ROUTE_LOCALNET, |
2556 | "route_localnet"), | |
12b74dfa JB |
2557 | DEVINET_SYSCTL_FLUSHING_ENTRY(DROP_UNICAST_IN_L2_MULTICAST, |
2558 | "drop_unicast_in_l2_multicast"), | |
1da177e4 | 2559 | }, |
1da177e4 LT |
2560 | }; |
2561 | ||
ea40b324 | 2562 | static int __devinet_sysctl_register(struct net *net, char *dev_name, |
29c994e3 | 2563 | int ifindex, struct ipv4_devconf *p) |
1da177e4 LT |
2564 | { |
2565 | int i; | |
9fa89642 | 2566 | struct devinet_sysctl_table *t; |
8607ddb8 | 2567 | char path[sizeof("net/ipv4/conf/") + IFNAMSIZ]; |
bfada697 | 2568 | |
9fa89642 | 2569 | t = kmemdup(&devinet_sysctl, sizeof(*t), GFP_KERNEL); |
1da177e4 | 2570 | if (!t) |
9fa89642 PE |
2571 | goto out; |
2572 | ||
1da177e4 LT |
2573 | for (i = 0; i < ARRAY_SIZE(t->devinet_vars) - 1; i++) { |
2574 | t->devinet_vars[i].data += (char *)p - (char *)&ipv4_devconf; | |
31be3085 | 2575 | t->devinet_vars[i].extra1 = p; |
c0ce9fb3 | 2576 | t->devinet_vars[i].extra2 = net; |
1da177e4 LT |
2577 | } |
2578 | ||
8607ddb8 | 2579 | snprintf(path, sizeof(path), "net/ipv4/conf/%s", dev_name); |
1da177e4 | 2580 | |
8607ddb8 | 2581 | t->sysctl_header = register_net_sysctl(net, path, t->devinet_vars); |
1da177e4 | 2582 | if (!t->sysctl_header) |
8607ddb8 | 2583 | goto free; |
1da177e4 LT |
2584 | |
2585 | p->sysctl = t; | |
29c994e3 | 2586 | |
3b022865 DA |
2587 | inet_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL, |
2588 | ifindex, p); | |
ea40b324 | 2589 | return 0; |
1da177e4 | 2590 | |
9fa89642 | 2591 | free: |
1da177e4 | 2592 | kfree(t); |
9fa89642 | 2593 | out: |
ea40b324 | 2594 | return -ENOBUFS; |
1da177e4 LT |
2595 | } |
2596 | ||
b5c9641d DA |
2597 | static void __devinet_sysctl_unregister(struct net *net, |
2598 | struct ipv4_devconf *cnf, int ifindex) | |
51602b2a PE |
2599 | { |
2600 | struct devinet_sysctl_table *t = cnf->sysctl; | |
2601 | ||
b5c9641d DA |
2602 | if (t) { |
2603 | cnf->sysctl = NULL; | |
2604 | unregister_net_sysctl_table(t->sysctl_header); | |
2605 | kfree(t); | |
2606 | } | |
51602b2a | 2607 | |
b5c9641d | 2608 | inet_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL); |
51602b2a PE |
2609 | } |
2610 | ||
20e61da7 | 2611 | static int devinet_sysctl_register(struct in_device *idev) |
66f27a52 | 2612 | { |
20e61da7 WC |
2613 | int err; |
2614 | ||
2615 | if (!sysctl_dev_name_is_allowed(idev->dev->name)) | |
2616 | return -EINVAL; | |
2617 | ||
2618 | err = neigh_sysctl_register(idev->dev, idev->arp_parms, NULL); | |
2619 | if (err) | |
2620 | return err; | |
2621 | err = __devinet_sysctl_register(dev_net(idev->dev), idev->dev->name, | |
29c994e3 | 2622 | idev->dev->ifindex, &idev->cnf); |
20e61da7 WC |
2623 | if (err) |
2624 | neigh_sysctl_unregister(idev->arp_parms); | |
2625 | return err; | |
66f27a52 PE |
2626 | } |
2627 | ||
51602b2a | 2628 | static void devinet_sysctl_unregister(struct in_device *idev) |
1da177e4 | 2629 | { |
b5c9641d DA |
2630 | struct net *net = dev_net(idev->dev); |
2631 | ||
2632 | __devinet_sysctl_unregister(net, &idev->cnf, idev->dev->ifindex); | |
51602b2a | 2633 | neigh_sysctl_unregister(idev->arp_parms); |
1da177e4 | 2634 | } |
1da177e4 | 2635 | |
68dd299b PE |
2636 | static struct ctl_table ctl_forward_entry[] = { |
2637 | { | |
68dd299b PE |
2638 | .procname = "ip_forward", |
2639 | .data = &ipv4_devconf.data[ | |
02291680 | 2640 | IPV4_DEVCONF_FORWARDING - 1], |
68dd299b PE |
2641 | .maxlen = sizeof(int), |
2642 | .mode = 0644, | |
2643 | .proc_handler = devinet_sysctl_forward, | |
68dd299b | 2644 | .extra1 = &ipv4_devconf, |
c0ce9fb3 | 2645 | .extra2 = &init_net, |
68dd299b PE |
2646 | }, |
2647 | { }, | |
2648 | }; | |
2a75de0c | 2649 | #endif |
68dd299b | 2650 | |
752d14dc PE |
2651 | static __net_init int devinet_init_net(struct net *net) |
2652 | { | |
2653 | int err; | |
752d14dc | 2654 | struct ipv4_devconf *all, *dflt; |
2a75de0c | 2655 | #ifdef CONFIG_SYSCTL |
856c395c | 2656 | struct ctl_table *tbl; |
752d14dc | 2657 | struct ctl_table_header *forw_hdr; |
2a75de0c | 2658 | #endif |
752d14dc PE |
2659 | |
2660 | err = -ENOMEM; | |
856c395c CW |
2661 | all = kmemdup(&ipv4_devconf, sizeof(ipv4_devconf), GFP_KERNEL); |
2662 | if (!all) | |
2663 | goto err_alloc_all; | |
752d14dc | 2664 | |
856c395c CW |
2665 | dflt = kmemdup(&ipv4_devconf_dflt, sizeof(ipv4_devconf_dflt), GFP_KERNEL); |
2666 | if (!dflt) | |
2667 | goto err_alloc_dflt; | |
752d14dc | 2668 | |
2a75de0c | 2669 | #ifdef CONFIG_SYSCTL |
856c395c CW |
2670 | tbl = kmemdup(ctl_forward_entry, sizeof(ctl_forward_entry), GFP_KERNEL); |
2671 | if (!tbl) | |
2672 | goto err_alloc_ctl; | |
752d14dc | 2673 | |
856c395c CW |
2674 | tbl[0].data = &all->data[IPV4_DEVCONF_FORWARDING - 1]; |
2675 | tbl[0].extra1 = all; | |
2676 | tbl[0].extra2 = net; | |
2a75de0c | 2677 | #endif |
856c395c | 2678 | |
9efd6a3c ND |
2679 | if (!net_eq(net, &init_net)) { |
2680 | if (IS_ENABLED(CONFIG_SYSCTL) && | |
2681 | sysctl_devconf_inherit_init_net == 3) { | |
2682 | /* copy from the current netns */ | |
2683 | memcpy(all, current->nsproxy->net_ns->ipv4.devconf_all, | |
2684 | sizeof(ipv4_devconf)); | |
2685 | memcpy(dflt, | |
2686 | current->nsproxy->net_ns->ipv4.devconf_dflt, | |
2687 | sizeof(ipv4_devconf_dflt)); | |
2688 | } else if (!IS_ENABLED(CONFIG_SYSCTL) || | |
2689 | sysctl_devconf_inherit_init_net != 2) { | |
2690 | /* inherit == 0 or 1: copy from init_net */ | |
2691 | memcpy(all, init_net.ipv4.devconf_all, | |
2692 | sizeof(ipv4_devconf)); | |
2693 | memcpy(dflt, init_net.ipv4.devconf_dflt, | |
2694 | sizeof(ipv4_devconf_dflt)); | |
2695 | } | |
2696 | /* else inherit == 2: use compiled values */ | |
752d14dc PE |
2697 | } |
2698 | ||
2699 | #ifdef CONFIG_SYSCTL | |
29c994e3 | 2700 | err = __devinet_sysctl_register(net, "all", NETCONFA_IFINDEX_ALL, all); |
752d14dc PE |
2701 | if (err < 0) |
2702 | goto err_reg_all; | |
2703 | ||
29c994e3 ND |
2704 | err = __devinet_sysctl_register(net, "default", |
2705 | NETCONFA_IFINDEX_DEFAULT, dflt); | |
752d14dc PE |
2706 | if (err < 0) |
2707 | goto err_reg_dflt; | |
2708 | ||
2709 | err = -ENOMEM; | |
8607ddb8 | 2710 | forw_hdr = register_net_sysctl(net, "net/ipv4", tbl); |
51456b29 | 2711 | if (!forw_hdr) |
752d14dc | 2712 | goto err_reg_ctl; |
2a75de0c | 2713 | net->ipv4.forw_hdr = forw_hdr; |
752d14dc PE |
2714 | #endif |
2715 | ||
752d14dc PE |
2716 | net->ipv4.devconf_all = all; |
2717 | net->ipv4.devconf_dflt = dflt; | |
2718 | return 0; | |
2719 | ||
2720 | #ifdef CONFIG_SYSCTL | |
2721 | err_reg_ctl: | |
b5c9641d | 2722 | __devinet_sysctl_unregister(net, dflt, NETCONFA_IFINDEX_DEFAULT); |
752d14dc | 2723 | err_reg_dflt: |
b5c9641d | 2724 | __devinet_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL); |
752d14dc | 2725 | err_reg_all: |
856c395c | 2726 | kfree(tbl); |
752d14dc | 2727 | err_alloc_ctl: |
2a75de0c | 2728 | #endif |
856c395c | 2729 | kfree(dflt); |
752d14dc | 2730 | err_alloc_dflt: |
856c395c | 2731 | kfree(all); |
752d14dc PE |
2732 | err_alloc_all: |
2733 | return err; | |
2734 | } | |
2735 | ||
2736 | static __net_exit void devinet_exit_net(struct net *net) | |
2737 | { | |
2a75de0c | 2738 | #ifdef CONFIG_SYSCTL |
752d14dc PE |
2739 | struct ctl_table *tbl; |
2740 | ||
2741 | tbl = net->ipv4.forw_hdr->ctl_table_arg; | |
752d14dc | 2742 | unregister_net_sysctl_table(net->ipv4.forw_hdr); |
b5c9641d DA |
2743 | __devinet_sysctl_unregister(net, net->ipv4.devconf_dflt, |
2744 | NETCONFA_IFINDEX_DEFAULT); | |
2745 | __devinet_sysctl_unregister(net, net->ipv4.devconf_all, | |
2746 | NETCONFA_IFINDEX_ALL); | |
752d14dc | 2747 | kfree(tbl); |
2a75de0c | 2748 | #endif |
752d14dc PE |
2749 | kfree(net->ipv4.devconf_dflt); |
2750 | kfree(net->ipv4.devconf_all); | |
2751 | } | |
2752 | ||
2753 | static __net_initdata struct pernet_operations devinet_ops = { | |
2754 | .init = devinet_init_net, | |
2755 | .exit = devinet_exit_net, | |
2756 | }; | |
2757 | ||
207895fd | 2758 | static struct rtnl_af_ops inet_af_ops __read_mostly = { |
9f0f7272 TG |
2759 | .family = AF_INET, |
2760 | .fill_link_af = inet_fill_link_af, | |
2761 | .get_link_af_size = inet_get_link_af_size, | |
cf7afbfe TG |
2762 | .validate_link_af = inet_validate_link_af, |
2763 | .set_link_af = inet_set_link_af, | |
9f0f7272 TG |
2764 | }; |
2765 | ||
1da177e4 LT |
2766 | void __init devinet_init(void) |
2767 | { | |
fd23c3b3 DM |
2768 | int i; |
2769 | ||
2770 | for (i = 0; i < IN4_ADDR_HSIZE; i++) | |
2771 | INIT_HLIST_HEAD(&inet_addr_lst[i]); | |
2772 | ||
752d14dc | 2773 | register_pernet_subsys(&devinet_ops); |
1da177e4 | 2774 | register_netdevice_notifier(&ip_netdev_notifier); |
63f3444f | 2775 | |
906e073f | 2776 | queue_delayed_work(system_power_efficient_wq, &check_lifetime_work, 0); |
5c766d64 | 2777 | |
9f0f7272 TG |
2778 | rtnl_af_register(&inet_af_ops); |
2779 | ||
b97bac64 FW |
2780 | rtnl_register(PF_INET, RTM_NEWADDR, inet_rtm_newaddr, NULL, 0); |
2781 | rtnl_register(PF_INET, RTM_DELADDR, inet_rtm_deladdr, NULL, 0); | |
2782 | rtnl_register(PF_INET, RTM_GETADDR, NULL, inet_dump_ifaddr, 0); | |
9e551110 | 2783 | rtnl_register(PF_INET, RTM_GETNETCONF, inet_netconf_get_devconf, |
b97bac64 | 2784 | inet_netconf_dump_devconf, 0); |
1da177e4 | 2785 | } |