Line data Source code
1 : // SPDX-License-Identifier: GPL-2.0-or-later
2 : /*
3 : * NET3 IP device support routines.
4 : *
5 : * Derived from the IP parts of dev.c 1.0.19
6 : * Authors: Ross Biro
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 :
24 :
25 : #include <linux/uaccess.h>
26 : #include <linux/bitops.h>
27 : #include <linux/capability.h>
28 : #include <linux/module.h>
29 : #include <linux/types.h>
30 : #include <linux/kernel.h>
31 : #include <linux/sched/signal.h>
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>
39 : #include <linux/if_addr.h>
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>
45 : #include <linux/init.h>
46 : #include <linux/notifier.h>
47 : #include <linux/inetdevice.h>
48 : #include <linux/igmp.h>
49 : #include <linux/slab.h>
50 : #include <linux/hash.h>
51 : #ifdef CONFIG_SYSCTL
52 : #include <linux/sysctl.h>
53 : #endif
54 : #include <linux/kmod.h>
55 : #include <linux/netconf.h>
56 :
57 : #include <net/arp.h>
58 : #include <net/ip.h>
59 : #include <net/route.h>
60 : #include <net/ip_fib.h>
61 : #include <net/rtnetlink.h>
62 : #include <net/net_namespace.h>
63 : #include <net/addrconf.h>
64 :
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 :
70 : static struct ipv4_devconf ipv4_devconf = {
71 : .data = {
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,
76 : [IPV4_DEVCONF_IGMPV2_UNSOLICITED_REPORT_INTERVAL - 1] = 10000 /*ms*/,
77 : [IPV4_DEVCONF_IGMPV3_UNSOLICITED_REPORT_INTERVAL - 1] = 1000 /*ms*/,
78 : },
79 : };
80 :
81 : static struct ipv4_devconf ipv4_devconf_dflt = {
82 : .data = {
83 : [IPV4_DEVCONF_ACCEPT_REDIRECTS - 1] = 1,
84 : [IPV4_DEVCONF_SEND_REDIRECTS - 1] = 1,
85 : [IPV4_DEVCONF_SECURE_REDIRECTS - 1] = 1,
86 : [IPV4_DEVCONF_SHARED_MEDIA - 1] = 1,
87 : [IPV4_DEVCONF_ACCEPT_SOURCE_ROUTE - 1] = 1,
88 : [IPV4_DEVCONF_IGMPV2_UNSOLICITED_REPORT_INTERVAL - 1] = 10000 /*ms*/,
89 : [IPV4_DEVCONF_IGMPV3_UNSOLICITED_REPORT_INTERVAL - 1] = 1000 /*ms*/,
90 : },
91 : };
92 :
93 : #define IPV4_DEVCONF_DFLT(net, attr) \
94 : IPV4_DEVCONF((*net->ipv4.devconf_dflt), attr)
95 :
96 : static const struct nla_policy ifa_ipv4_policy[IFA_MAX+1] = {
97 : [IFA_LOCAL] = { .type = NLA_U32 },
98 : [IFA_ADDRESS] = { .type = NLA_U32 },
99 : [IFA_BROADCAST] = { .type = NLA_U32 },
100 : [IFA_LABEL] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 },
101 : [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
102 : [IFA_FLAGS] = { .type = NLA_U32 },
103 : [IFA_RT_PRIORITY] = { .type = NLA_U32 },
104 : [IFA_TARGET_NETNSID] = { .type = NLA_S32 },
105 : };
106 :
107 : struct inet_fill_args {
108 : u32 portid;
109 : u32 seq;
110 : int event;
111 : unsigned int flags;
112 : int netnsid;
113 : int ifindex;
114 : };
115 :
116 : #define IN4_ADDR_HSIZE_SHIFT 8
117 : #define IN4_ADDR_HSIZE (1U << IN4_ADDR_HSIZE_SHIFT)
118 :
119 : static struct hlist_head inet_addr_lst[IN4_ADDR_HSIZE];
120 :
121 100 : static u32 inet_addr_hash(const struct net *net, __be32 addr)
122 : {
123 100 : u32 val = (__force u32) addr ^ net_hash_mix(net);
124 :
125 100 : return hash_32(val, IN4_ADDR_HSIZE_SHIFT);
126 : }
127 :
128 2 : static void inet_hash_insert(struct net *net, struct in_ifaddr *ifa)
129 : {
130 2 : u32 hash = inet_addr_hash(net, ifa->ifa_local);
131 :
132 2 : ASSERT_RTNL();
133 2 : hlist_add_head_rcu(&ifa->hash, &inet_addr_lst[hash]);
134 2 : }
135 :
136 0 : static void inet_hash_remove(struct in_ifaddr *ifa)
137 : {
138 0 : ASSERT_RTNL();
139 0 : hlist_del_init_rcu(&ifa->hash);
140 0 : }
141 :
142 : /**
143 : * __ip_dev_find - find the first device with a given source address.
144 : * @net: the net namespace
145 : * @addr: the source address
146 : * @devref: if true, take a reference on the found device
147 : *
148 : * If a caller uses devref=false, it should be protected by RCU, or RTNL
149 : */
150 25 : struct net_device *__ip_dev_find(struct net *net, __be32 addr, bool devref)
151 : {
152 25 : struct net_device *result = NULL;
153 25 : struct in_ifaddr *ifa;
154 :
155 25 : rcu_read_lock();
156 25 : ifa = inet_lookup_ifaddr_rcu(net, addr);
157 25 : if (!ifa) {
158 0 : struct flowi4 fl4 = { .daddr = addr };
159 0 : struct fib_result res = { 0 };
160 0 : struct fib_table *local;
161 :
162 : /* Fallback to FIB local table so that communication
163 : * over loopback subnets work.
164 : */
165 0 : local = fib_get_table(net, RT_TABLE_LOCAL);
166 0 : if (local &&
167 0 : !fib_table_lookup(local, &fl4, &res, FIB_LOOKUP_NOREF) &&
168 0 : res.type == RTN_LOCAL)
169 0 : result = FIB_RES_DEV(res);
170 : } else {
171 25 : result = ifa->ifa_dev->dev;
172 : }
173 25 : if (result && devref)
174 0 : dev_hold(result);
175 25 : rcu_read_unlock();
176 25 : return result;
177 : }
178 : EXPORT_SYMBOL(__ip_dev_find);
179 :
180 : /* called under RCU lock */
181 98 : struct in_ifaddr *inet_lookup_ifaddr_rcu(struct net *net, __be32 addr)
182 : {
183 98 : u32 hash = inet_addr_hash(net, addr);
184 98 : struct in_ifaddr *ifa;
185 :
186 196 : hlist_for_each_entry_rcu(ifa, &inet_addr_lst[hash], hash)
187 25 : if (ifa->ifa_local == addr &&
188 25 : net_eq(dev_net(ifa->ifa_dev->dev), net))
189 25 : return ifa;
190 :
191 : return NULL;
192 : }
193 :
194 : static void rtmsg_ifa(int event, struct in_ifaddr *, struct nlmsghdr *, u32);
195 :
196 : static BLOCKING_NOTIFIER_HEAD(inetaddr_chain);
197 : static BLOCKING_NOTIFIER_HEAD(inetaddr_validator_chain);
198 : static void inet_del_ifa(struct in_device *in_dev,
199 : struct in_ifaddr __rcu **ifap,
200 : int destroy);
201 : #ifdef CONFIG_SYSCTL
202 : static int devinet_sysctl_register(struct in_device *idev);
203 : static void devinet_sysctl_unregister(struct in_device *idev);
204 : #else
205 : static int devinet_sysctl_register(struct in_device *idev)
206 : {
207 : return 0;
208 : }
209 : static void devinet_sysctl_unregister(struct in_device *idev)
210 : {
211 : }
212 : #endif
213 :
214 : /* Locks all the inet devices. */
215 :
216 3 : static struct in_ifaddr *inet_alloc_ifa(void)
217 : {
218 3 : return kzalloc(sizeof(struct in_ifaddr), GFP_KERNEL);
219 : }
220 :
221 1 : static void inet_rcu_free_ifa(struct rcu_head *head)
222 : {
223 1 : struct in_ifaddr *ifa = container_of(head, struct in_ifaddr, rcu_head);
224 1 : if (ifa->ifa_dev)
225 1 : in_dev_put(ifa->ifa_dev);
226 1 : kfree(ifa);
227 1 : }
228 :
229 1 : static void inet_free_ifa(struct in_ifaddr *ifa)
230 : {
231 1 : call_rcu(&ifa->rcu_head, inet_rcu_free_ifa);
232 0 : }
233 :
234 0 : void in_dev_finish_destroy(struct in_device *idev)
235 : {
236 0 : struct net_device *dev = idev->dev;
237 :
238 0 : WARN_ON(idev->ifa_list);
239 0 : WARN_ON(idev->mc_list);
240 0 : kfree(rcu_dereference_protected(idev->mc_hash, 1));
241 : #ifdef NET_REFCNT_DEBUG
242 : pr_debug("%s: %p=%s\n", __func__, idev, dev ? dev->name : "NIL");
243 : #endif
244 0 : dev_put(dev);
245 0 : if (!idev->dead)
246 0 : pr_err("Freeing alive in_device %p\n", idev);
247 : else
248 0 : kfree(idev);
249 0 : }
250 : EXPORT_SYMBOL(in_dev_finish_destroy);
251 :
252 2 : static struct in_device *inetdev_init(struct net_device *dev)
253 : {
254 2 : struct in_device *in_dev;
255 2 : int err = -ENOMEM;
256 :
257 2 : ASSERT_RTNL();
258 :
259 2 : in_dev = kzalloc(sizeof(*in_dev), GFP_KERNEL);
260 2 : if (!in_dev)
261 0 : goto out;
262 2 : memcpy(&in_dev->cnf, dev_net(dev)->ipv4.devconf_dflt,
263 : sizeof(in_dev->cnf));
264 2 : in_dev->cnf.sysctl = NULL;
265 2 : in_dev->dev = dev;
266 2 : in_dev->arp_parms = neigh_parms_alloc(dev, &arp_tbl);
267 2 : if (!in_dev->arp_parms)
268 0 : goto out_kfree;
269 2 : if (IPV4_DEVCONF(in_dev->cnf, FORWARDING))
270 0 : dev_disable_lro(dev);
271 : /* Reference in_dev->dev */
272 2 : dev_hold(dev);
273 : /* Account for reference dev->ip_ptr (below) */
274 2 : refcount_set(&in_dev->refcnt, 1);
275 :
276 2 : err = devinet_sysctl_register(in_dev);
277 2 : if (err) {
278 0 : in_dev->dead = 1;
279 0 : neigh_parms_release(&arp_tbl, in_dev->arp_parms);
280 0 : in_dev_put(in_dev);
281 0 : in_dev = NULL;
282 0 : goto out;
283 : }
284 2 : ip_mc_init_dev(in_dev);
285 2 : if (dev->flags & IFF_UP)
286 0 : ip_mc_up(in_dev);
287 :
288 : /* we can receive as soon as ip_ptr is set -- do this last */
289 2 : rcu_assign_pointer(dev->ip_ptr, in_dev);
290 2 : out:
291 2 : return in_dev ?: ERR_PTR(err);
292 0 : out_kfree:
293 0 : kfree(in_dev);
294 0 : in_dev = NULL;
295 0 : goto out;
296 : }
297 :
298 0 : static void in_dev_rcu_put(struct rcu_head *head)
299 : {
300 0 : struct in_device *idev = container_of(head, struct in_device, rcu_head);
301 0 : in_dev_put(idev);
302 0 : }
303 :
304 0 : static void inetdev_destroy(struct in_device *in_dev)
305 : {
306 0 : struct net_device *dev;
307 0 : struct in_ifaddr *ifa;
308 :
309 0 : ASSERT_RTNL();
310 :
311 0 : dev = in_dev->dev;
312 :
313 0 : in_dev->dead = 1;
314 :
315 0 : ip_mc_destroy_dev(in_dev);
316 :
317 0 : while ((ifa = rtnl_dereference(in_dev->ifa_list)) != NULL) {
318 0 : inet_del_ifa(in_dev, &in_dev->ifa_list, 0);
319 0 : inet_free_ifa(ifa);
320 : }
321 :
322 0 : RCU_INIT_POINTER(dev->ip_ptr, NULL);
323 :
324 0 : devinet_sysctl_unregister(in_dev);
325 0 : neigh_parms_release(&arp_tbl, in_dev->arp_parms);
326 0 : arp_ifdown(dev);
327 :
328 0 : call_rcu(&in_dev->rcu_head, in_dev_rcu_put);
329 0 : }
330 :
331 0 : int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b)
332 : {
333 0 : const struct in_ifaddr *ifa;
334 :
335 0 : rcu_read_lock();
336 0 : in_dev_for_each_ifa_rcu(ifa, in_dev) {
337 0 : if (inet_ifa_match(a, ifa)) {
338 0 : if (!b || inet_ifa_match(b, ifa)) {
339 0 : rcu_read_unlock();
340 0 : return 1;
341 : }
342 : }
343 : }
344 0 : rcu_read_unlock();
345 0 : return 0;
346 : }
347 :
348 0 : static void __inet_del_ifa(struct in_device *in_dev,
349 : struct in_ifaddr __rcu **ifap,
350 : int destroy, struct nlmsghdr *nlh, u32 portid)
351 : {
352 0 : struct in_ifaddr *promote = NULL;
353 0 : struct in_ifaddr *ifa, *ifa1;
354 0 : struct in_ifaddr *last_prim;
355 0 : struct in_ifaddr *prev_prom = NULL;
356 0 : int do_promote = IN_DEV_PROMOTE_SECONDARIES(in_dev);
357 :
358 0 : ASSERT_RTNL();
359 :
360 0 : ifa1 = rtnl_dereference(*ifap);
361 0 : last_prim = rtnl_dereference(in_dev->ifa_list);
362 0 : if (in_dev->dead)
363 0 : goto no_promotions;
364 :
365 : /* 1. Deleting primary ifaddr forces deletion all secondaries
366 : * unless alias promotion is set
367 : **/
368 :
369 0 : if (!(ifa1->ifa_flags & IFA_F_SECONDARY)) {
370 0 : struct in_ifaddr __rcu **ifap1 = &ifa1->ifa_next;
371 :
372 0 : while ((ifa = rtnl_dereference(*ifap1)) != NULL) {
373 0 : if (!(ifa->ifa_flags & IFA_F_SECONDARY) &&
374 0 : ifa1->ifa_scope <= ifa->ifa_scope)
375 0 : last_prim = ifa;
376 :
377 0 : if (!(ifa->ifa_flags & IFA_F_SECONDARY) ||
378 0 : ifa1->ifa_mask != ifa->ifa_mask ||
379 0 : !inet_ifa_match(ifa1->ifa_address, ifa)) {
380 0 : ifap1 = &ifa->ifa_next;
381 0 : prev_prom = ifa;
382 0 : continue;
383 : }
384 :
385 0 : if (!do_promote) {
386 0 : inet_hash_remove(ifa);
387 0 : *ifap1 = ifa->ifa_next;
388 :
389 0 : rtmsg_ifa(RTM_DELADDR, ifa, nlh, portid);
390 0 : blocking_notifier_call_chain(&inetaddr_chain,
391 : NETDEV_DOWN, ifa);
392 0 : inet_free_ifa(ifa);
393 : } else {
394 : promote = ifa;
395 : break;
396 : }
397 : }
398 : }
399 :
400 : /* On promotion all secondaries from subnet are changing
401 : * the primary IP, we must remove all their routes silently
402 : * and later to add them back with new prefsrc. Do this
403 : * while all addresses are on the device list.
404 : */
405 0 : for (ifa = promote; ifa; ifa = rtnl_dereference(ifa->ifa_next)) {
406 0 : if (ifa1->ifa_mask == ifa->ifa_mask &&
407 0 : inet_ifa_match(ifa1->ifa_address, ifa))
408 0 : fib_del_ifaddr(ifa, ifa1);
409 : }
410 :
411 0 : no_promotions:
412 : /* 2. Unlink it */
413 :
414 0 : *ifap = ifa1->ifa_next;
415 0 : inet_hash_remove(ifa1);
416 :
417 : /* 3. Announce address deletion */
418 :
419 : /* Send message first, then call notifier.
420 : At first sight, FIB update triggered by notifier
421 : will refer to already deleted ifaddr, that could confuse
422 : netlink listeners. It is not true: look, gated sees
423 : that route deleted and if it still thinks that ifaddr
424 : is valid, it will try to restore deleted routes... Grr.
425 : So that, this order is correct.
426 : */
427 0 : rtmsg_ifa(RTM_DELADDR, ifa1, nlh, portid);
428 0 : blocking_notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa1);
429 :
430 0 : if (promote) {
431 0 : struct in_ifaddr *next_sec;
432 :
433 0 : next_sec = rtnl_dereference(promote->ifa_next);
434 0 : if (prev_prom) {
435 0 : struct in_ifaddr *last_sec;
436 :
437 0 : rcu_assign_pointer(prev_prom->ifa_next, next_sec);
438 :
439 0 : last_sec = rtnl_dereference(last_prim->ifa_next);
440 0 : rcu_assign_pointer(promote->ifa_next, last_sec);
441 0 : rcu_assign_pointer(last_prim->ifa_next, promote);
442 : }
443 :
444 0 : promote->ifa_flags &= ~IFA_F_SECONDARY;
445 0 : rtmsg_ifa(RTM_NEWADDR, promote, nlh, portid);
446 0 : blocking_notifier_call_chain(&inetaddr_chain,
447 : NETDEV_UP, promote);
448 0 : for (ifa = next_sec; ifa;
449 0 : ifa = rtnl_dereference(ifa->ifa_next)) {
450 0 : if (ifa1->ifa_mask != ifa->ifa_mask ||
451 0 : !inet_ifa_match(ifa1->ifa_address, ifa))
452 0 : continue;
453 0 : fib_add_ifaddr(ifa);
454 : }
455 :
456 : }
457 0 : if (destroy)
458 0 : inet_free_ifa(ifa1);
459 0 : }
460 :
461 0 : static void inet_del_ifa(struct in_device *in_dev,
462 : struct in_ifaddr __rcu **ifap,
463 : int destroy)
464 : {
465 0 : __inet_del_ifa(in_dev, ifap, destroy, NULL, 0);
466 0 : }
467 :
468 : static void check_lifetime(struct work_struct *work);
469 :
470 : static DECLARE_DELAYED_WORK(check_lifetime_work, check_lifetime);
471 :
472 3 : static int __inet_insert_ifa(struct in_ifaddr *ifa, struct nlmsghdr *nlh,
473 : u32 portid, struct netlink_ext_ack *extack)
474 : {
475 3 : struct in_ifaddr __rcu **last_primary, **ifap;
476 3 : struct in_device *in_dev = ifa->ifa_dev;
477 3 : struct in_validator_info ivi;
478 3 : struct in_ifaddr *ifa1;
479 3 : int ret;
480 :
481 3 : ASSERT_RTNL();
482 :
483 3 : if (!ifa->ifa_local) {
484 0 : inet_free_ifa(ifa);
485 0 : return 0;
486 : }
487 :
488 3 : ifa->ifa_flags &= ~IFA_F_SECONDARY;
489 3 : last_primary = &in_dev->ifa_list;
490 :
491 : /* Don't set IPv6 only flags to IPv4 addresses */
492 3 : ifa->ifa_flags &= ~IPV6ONLY_FLAGS;
493 :
494 3 : ifap = &in_dev->ifa_list;
495 3 : ifa1 = rtnl_dereference(*ifap);
496 :
497 3 : while (ifa1) {
498 1 : if (!(ifa1->ifa_flags & IFA_F_SECONDARY) &&
499 1 : ifa->ifa_scope <= ifa1->ifa_scope)
500 1 : last_primary = &ifa1->ifa_next;
501 1 : if (ifa1->ifa_mask == ifa->ifa_mask &&
502 1 : inet_ifa_match(ifa1->ifa_address, ifa)) {
503 1 : if (ifa1->ifa_local == ifa->ifa_local) {
504 1 : inet_free_ifa(ifa);
505 1 : return -EEXIST;
506 : }
507 0 : if (ifa1->ifa_scope != ifa->ifa_scope) {
508 0 : inet_free_ifa(ifa);
509 0 : return -EINVAL;
510 : }
511 0 : ifa->ifa_flags |= IFA_F_SECONDARY;
512 : }
513 :
514 0 : ifap = &ifa1->ifa_next;
515 0 : ifa1 = rtnl_dereference(*ifap);
516 : }
517 :
518 : /* Allow any devices that wish to register ifaddr validtors to weigh
519 : * in now, before changes are committed. The rntl lock is serializing
520 : * access here, so the state should not change between a validator call
521 : * and a final notify on commit. This isn't invoked on promotion under
522 : * the assumption that validators are checking the address itself, and
523 : * not the flags.
524 : */
525 2 : ivi.ivi_addr = ifa->ifa_address;
526 2 : ivi.ivi_dev = ifa->ifa_dev;
527 2 : ivi.extack = extack;
528 2 : ret = blocking_notifier_call_chain(&inetaddr_validator_chain,
529 : NETDEV_UP, &ivi);
530 2 : ret = notifier_to_errno(ret);
531 0 : if (ret) {
532 0 : inet_free_ifa(ifa);
533 0 : return ret;
534 : }
535 :
536 2 : if (!(ifa->ifa_flags & IFA_F_SECONDARY)) {
537 2 : prandom_seed((__force u32) ifa->ifa_local);
538 2 : ifap = last_primary;
539 : }
540 :
541 2 : rcu_assign_pointer(ifa->ifa_next, *ifap);
542 2 : rcu_assign_pointer(*ifap, ifa);
543 :
544 2 : inet_hash_insert(dev_net(in_dev->dev), ifa);
545 :
546 2 : cancel_delayed_work(&check_lifetime_work);
547 2 : queue_delayed_work(system_power_efficient_wq, &check_lifetime_work, 0);
548 :
549 : /* Send message first, then call notifier.
550 : Notifier will trigger FIB update, so that
551 : listeners of netlink will know about new ifaddr */
552 2 : rtmsg_ifa(RTM_NEWADDR, ifa, nlh, portid);
553 2 : blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa);
554 :
555 2 : return 0;
556 : }
557 :
558 1 : static int inet_insert_ifa(struct in_ifaddr *ifa)
559 : {
560 1 : return __inet_insert_ifa(ifa, NULL, 0, NULL);
561 : }
562 :
563 0 : static int inet_set_ifa(struct net_device *dev, struct in_ifaddr *ifa)
564 : {
565 0 : struct in_device *in_dev = __in_dev_get_rtnl(dev);
566 :
567 0 : ASSERT_RTNL();
568 :
569 0 : if (!in_dev) {
570 0 : inet_free_ifa(ifa);
571 0 : return -ENOBUFS;
572 : }
573 0 : ipv4_devconf_setall(in_dev);
574 0 : neigh_parms_data_state_setall(in_dev->arp_parms);
575 0 : if (ifa->ifa_dev != in_dev) {
576 0 : WARN_ON(ifa->ifa_dev);
577 0 : in_dev_hold(in_dev);
578 0 : ifa->ifa_dev = in_dev;
579 : }
580 0 : if (ipv4_is_loopback(ifa->ifa_local))
581 0 : ifa->ifa_scope = RT_SCOPE_HOST;
582 0 : return inet_insert_ifa(ifa);
583 : }
584 :
585 : /* Caller must hold RCU or RTNL :
586 : * We dont take a reference on found in_device
587 : */
588 7 : struct in_device *inetdev_by_index(struct net *net, int ifindex)
589 : {
590 7 : struct net_device *dev;
591 7 : struct in_device *in_dev = NULL;
592 :
593 7 : rcu_read_lock();
594 7 : dev = dev_get_by_index_rcu(net, ifindex);
595 7 : if (dev)
596 7 : in_dev = rcu_dereference_rtnl(dev->ip_ptr);
597 7 : rcu_read_unlock();
598 7 : return in_dev;
599 : }
600 : EXPORT_SYMBOL(inetdev_by_index);
601 :
602 : /* Called only from RTNL semaphored context. No locks. */
603 :
604 0 : struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix,
605 : __be32 mask)
606 : {
607 0 : struct in_ifaddr *ifa;
608 :
609 0 : ASSERT_RTNL();
610 :
611 0 : in_dev_for_each_ifa_rtnl(ifa, in_dev) {
612 0 : if (ifa->ifa_mask == mask && inet_ifa_match(prefix, ifa))
613 0 : return ifa;
614 : }
615 : return NULL;
616 : }
617 :
618 0 : static int ip_mc_autojoin_config(struct net *net, bool join,
619 : const struct in_ifaddr *ifa)
620 : {
621 : #if defined(CONFIG_IP_MULTICAST)
622 : struct ip_mreqn mreq = {
623 : .imr_multiaddr.s_addr = ifa->ifa_address,
624 : .imr_ifindex = ifa->ifa_dev->dev->ifindex,
625 : };
626 : struct sock *sk = net->ipv4.mc_autojoin_sk;
627 : int ret;
628 :
629 : ASSERT_RTNL();
630 :
631 : lock_sock(sk);
632 : if (join)
633 : ret = ip_mc_join_group(sk, &mreq);
634 : else
635 : ret = ip_mc_leave_group(sk, &mreq);
636 : release_sock(sk);
637 :
638 : return ret;
639 : #else
640 0 : return -EOPNOTSUPP;
641 : #endif
642 : }
643 :
644 0 : static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
645 : struct netlink_ext_ack *extack)
646 : {
647 0 : struct net *net = sock_net(skb->sk);
648 0 : struct in_ifaddr __rcu **ifap;
649 0 : struct nlattr *tb[IFA_MAX+1];
650 0 : struct in_device *in_dev;
651 0 : struct ifaddrmsg *ifm;
652 0 : struct in_ifaddr *ifa;
653 0 : int err;
654 :
655 0 : ASSERT_RTNL();
656 :
657 0 : err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
658 : ifa_ipv4_policy, extack);
659 0 : if (err < 0)
660 0 : goto errout;
661 :
662 0 : ifm = nlmsg_data(nlh);
663 0 : in_dev = inetdev_by_index(net, ifm->ifa_index);
664 0 : if (!in_dev) {
665 0 : err = -ENODEV;
666 0 : goto errout;
667 : }
668 :
669 0 : for (ifap = &in_dev->ifa_list; (ifa = rtnl_dereference(*ifap)) != NULL;
670 0 : ifap = &ifa->ifa_next) {
671 0 : if (tb[IFA_LOCAL] &&
672 0 : ifa->ifa_local != nla_get_in_addr(tb[IFA_LOCAL]))
673 0 : continue;
674 :
675 0 : if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label))
676 0 : continue;
677 :
678 0 : if (tb[IFA_ADDRESS] &&
679 0 : (ifm->ifa_prefixlen != ifa->ifa_prefixlen ||
680 0 : !inet_ifa_match(nla_get_in_addr(tb[IFA_ADDRESS]), ifa)))
681 0 : continue;
682 :
683 0 : if (ipv4_is_multicast(ifa->ifa_address))
684 0 : ip_mc_autojoin_config(net, false, ifa);
685 0 : __inet_del_ifa(in_dev, ifap, 1, nlh, NETLINK_CB(skb).portid);
686 0 : return 0;
687 : }
688 :
689 : err = -EADDRNOTAVAIL;
690 : errout:
691 : return err;
692 : }
693 :
694 : #define INFINITY_LIFE_TIME 0xFFFFFFFF
695 :
696 3 : static void check_lifetime(struct work_struct *work)
697 : {
698 3 : unsigned long now, next, next_sec, next_sched;
699 3 : struct in_ifaddr *ifa;
700 3 : struct hlist_node *n;
701 3 : int i;
702 :
703 3 : now = jiffies;
704 3 : next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
705 :
706 774 : for (i = 0; i < IN4_ADDR_HSIZE; i++) {
707 768 : bool change_needed = false;
708 :
709 768 : rcu_read_lock();
710 1542 : hlist_for_each_entry_rcu(ifa, &inet_addr_lst[i], hash) {
711 3 : unsigned long age;
712 :
713 3 : if (ifa->ifa_flags & IFA_F_PERMANENT)
714 2 : continue;
715 :
716 : /* We try to batch several events at once. */
717 1 : age = (now - ifa->ifa_tstamp +
718 : ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
719 :
720 1 : if (ifa->ifa_valid_lft != INFINITY_LIFE_TIME &&
721 1 : age >= ifa->ifa_valid_lft) {
722 : change_needed = true;
723 1 : } else if (ifa->ifa_preferred_lft ==
724 : INFINITY_LIFE_TIME) {
725 0 : continue;
726 1 : } else if (age >= ifa->ifa_preferred_lft) {
727 0 : if (time_before(ifa->ifa_tstamp +
728 : ifa->ifa_valid_lft * HZ, next))
729 0 : next = ifa->ifa_tstamp +
730 : ifa->ifa_valid_lft * HZ;
731 :
732 0 : if (!(ifa->ifa_flags & IFA_F_DEPRECATED))
733 0 : change_needed = true;
734 1 : } else if (time_before(ifa->ifa_tstamp +
735 : ifa->ifa_preferred_lft * HZ,
736 : next)) {
737 0 : next = ifa->ifa_tstamp +
738 : ifa->ifa_preferred_lft * HZ;
739 : }
740 : }
741 768 : rcu_read_unlock();
742 768 : if (!change_needed)
743 768 : continue;
744 0 : rtnl_lock();
745 0 : hlist_for_each_entry_safe(ifa, n, &inet_addr_lst[i], hash) {
746 0 : unsigned long age;
747 :
748 0 : if (ifa->ifa_flags & IFA_F_PERMANENT)
749 0 : continue;
750 :
751 : /* We try to batch several events at once. */
752 0 : age = (now - ifa->ifa_tstamp +
753 : ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
754 :
755 0 : if (ifa->ifa_valid_lft != INFINITY_LIFE_TIME &&
756 0 : age >= ifa->ifa_valid_lft) {
757 0 : struct in_ifaddr __rcu **ifap;
758 0 : struct in_ifaddr *tmp;
759 :
760 0 : ifap = &ifa->ifa_dev->ifa_list;
761 0 : tmp = rtnl_dereference(*ifap);
762 0 : while (tmp) {
763 0 : if (tmp == ifa) {
764 0 : inet_del_ifa(ifa->ifa_dev,
765 : ifap, 1);
766 : break;
767 : }
768 0 : ifap = &tmp->ifa_next;
769 0 : tmp = rtnl_dereference(*ifap);
770 : }
771 0 : } else if (ifa->ifa_preferred_lft !=
772 0 : INFINITY_LIFE_TIME &&
773 0 : age >= ifa->ifa_preferred_lft &&
774 0 : !(ifa->ifa_flags & IFA_F_DEPRECATED)) {
775 0 : ifa->ifa_flags |= IFA_F_DEPRECATED;
776 0 : rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0);
777 : }
778 : }
779 0 : rtnl_unlock();
780 : }
781 :
782 3 : next_sec = round_jiffies_up(next);
783 3 : next_sched = next;
784 :
785 : /* If rounded timeout is accurate enough, accept it. */
786 3 : if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
787 0 : next_sched = next_sec;
788 :
789 3 : now = jiffies;
790 : /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
791 3 : if (time_before(next_sched, now + ADDRCONF_TIMER_FUZZ_MAX))
792 0 : next_sched = now + ADDRCONF_TIMER_FUZZ_MAX;
793 :
794 3 : queue_delayed_work(system_power_efficient_wq, &check_lifetime_work,
795 : next_sched - now);
796 3 : }
797 :
798 3 : static void set_ifa_lifetime(struct in_ifaddr *ifa, __u32 valid_lft,
799 : __u32 prefered_lft)
800 : {
801 3 : unsigned long timeout;
802 :
803 3 : ifa->ifa_flags &= ~(IFA_F_PERMANENT | IFA_F_DEPRECATED);
804 :
805 3 : timeout = addrconf_timeout_fixup(valid_lft, HZ);
806 3 : if (addrconf_finite_timeout(timeout))
807 1 : ifa->ifa_valid_lft = timeout;
808 : else
809 2 : ifa->ifa_flags |= IFA_F_PERMANENT;
810 :
811 3 : timeout = addrconf_timeout_fixup(prefered_lft, HZ);
812 3 : if (addrconf_finite_timeout(timeout)) {
813 1 : if (timeout == 0)
814 0 : ifa->ifa_flags |= IFA_F_DEPRECATED;
815 1 : ifa->ifa_preferred_lft = timeout;
816 : }
817 3 : ifa->ifa_tstamp = jiffies;
818 3 : if (!ifa->ifa_cstamp)
819 3 : ifa->ifa_cstamp = ifa->ifa_tstamp;
820 3 : }
821 :
822 2 : static struct in_ifaddr *rtm_to_ifaddr(struct net *net, struct nlmsghdr *nlh,
823 : __u32 *pvalid_lft, __u32 *pprefered_lft,
824 : struct netlink_ext_ack *extack)
825 : {
826 2 : struct nlattr *tb[IFA_MAX+1];
827 2 : struct in_ifaddr *ifa;
828 2 : struct ifaddrmsg *ifm;
829 2 : struct net_device *dev;
830 2 : struct in_device *in_dev;
831 2 : int err;
832 :
833 2 : err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
834 : ifa_ipv4_policy, extack);
835 2 : if (err < 0)
836 0 : goto errout;
837 :
838 2 : ifm = nlmsg_data(nlh);
839 2 : err = -EINVAL;
840 2 : if (ifm->ifa_prefixlen > 32 || !tb[IFA_LOCAL])
841 0 : goto errout;
842 :
843 2 : dev = __dev_get_by_index(net, ifm->ifa_index);
844 2 : err = -ENODEV;
845 2 : if (!dev)
846 0 : goto errout;
847 :
848 2 : in_dev = __in_dev_get_rtnl(dev);
849 2 : err = -ENOBUFS;
850 2 : if (!in_dev)
851 0 : goto errout;
852 :
853 2 : ifa = inet_alloc_ifa();
854 2 : if (!ifa)
855 : /*
856 : * A potential indev allocation can be left alive, it stays
857 : * assigned to its device and is destroy with it.
858 : */
859 0 : goto errout;
860 :
861 2 : ipv4_devconf_setall(in_dev);
862 2 : neigh_parms_data_state_setall(in_dev->arp_parms);
863 2 : in_dev_hold(in_dev);
864 :
865 2 : if (!tb[IFA_ADDRESS])
866 1 : tb[IFA_ADDRESS] = tb[IFA_LOCAL];
867 :
868 2 : INIT_HLIST_NODE(&ifa->hash);
869 2 : ifa->ifa_prefixlen = ifm->ifa_prefixlen;
870 2 : ifa->ifa_mask = inet_make_mask(ifm->ifa_prefixlen);
871 2 : ifa->ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) :
872 2 : ifm->ifa_flags;
873 2 : ifa->ifa_scope = ifm->ifa_scope;
874 2 : ifa->ifa_dev = in_dev;
875 :
876 2 : ifa->ifa_local = nla_get_in_addr(tb[IFA_LOCAL]);
877 2 : ifa->ifa_address = nla_get_in_addr(tb[IFA_ADDRESS]);
878 :
879 2 : if (tb[IFA_BROADCAST])
880 1 : ifa->ifa_broadcast = nla_get_in_addr(tb[IFA_BROADCAST]);
881 :
882 2 : if (tb[IFA_LABEL])
883 1 : nla_strscpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ);
884 : else
885 1 : memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
886 :
887 2 : if (tb[IFA_RT_PRIORITY])
888 0 : ifa->ifa_rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]);
889 :
890 2 : if (tb[IFA_CACHEINFO]) {
891 1 : struct ifa_cacheinfo *ci;
892 :
893 1 : ci = nla_data(tb[IFA_CACHEINFO]);
894 1 : if (!ci->ifa_valid || ci->ifa_prefered > ci->ifa_valid) {
895 0 : err = -EINVAL;
896 0 : goto errout_free;
897 : }
898 1 : *pvalid_lft = ci->ifa_valid;
899 1 : *pprefered_lft = ci->ifa_prefered;
900 : }
901 :
902 : return ifa;
903 :
904 0 : errout_free:
905 0 : inet_free_ifa(ifa);
906 0 : errout:
907 0 : return ERR_PTR(err);
908 : }
909 :
910 2 : static struct in_ifaddr *find_matching_ifa(struct in_ifaddr *ifa)
911 : {
912 2 : struct in_device *in_dev = ifa->ifa_dev;
913 2 : struct in_ifaddr *ifa1;
914 :
915 2 : if (!ifa->ifa_local)
916 : return NULL;
917 :
918 2 : in_dev_for_each_ifa_rtnl(ifa1, in_dev) {
919 0 : if (ifa1->ifa_mask == ifa->ifa_mask &&
920 0 : inet_ifa_match(ifa1->ifa_address, ifa) &&
921 0 : ifa1->ifa_local == ifa->ifa_local)
922 0 : return ifa1;
923 : }
924 : return NULL;
925 : }
926 :
927 2 : static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
928 : struct netlink_ext_ack *extack)
929 : {
930 2 : struct net *net = sock_net(skb->sk);
931 2 : struct in_ifaddr *ifa;
932 2 : struct in_ifaddr *ifa_existing;
933 2 : __u32 valid_lft = INFINITY_LIFE_TIME;
934 2 : __u32 prefered_lft = INFINITY_LIFE_TIME;
935 :
936 2 : ASSERT_RTNL();
937 :
938 2 : ifa = rtm_to_ifaddr(net, nlh, &valid_lft, &prefered_lft, extack);
939 2 : if (IS_ERR(ifa))
940 0 : return PTR_ERR(ifa);
941 :
942 2 : ifa_existing = find_matching_ifa(ifa);
943 2 : if (!ifa_existing) {
944 : /* It would be best to check for !NLM_F_CREATE here but
945 : * userspace already relies on not having to provide this.
946 : */
947 2 : set_ifa_lifetime(ifa, valid_lft, prefered_lft);
948 2 : if (ifa->ifa_flags & IFA_F_MCAUTOJOIN) {
949 0 : int ret = ip_mc_autojoin_config(net, true, ifa);
950 :
951 0 : if (ret < 0) {
952 0 : inet_free_ifa(ifa);
953 0 : return ret;
954 : }
955 : }
956 2 : return __inet_insert_ifa(ifa, nlh, NETLINK_CB(skb).portid,
957 : extack);
958 : } else {
959 0 : u32 new_metric = ifa->ifa_rt_priority;
960 :
961 0 : inet_free_ifa(ifa);
962 :
963 0 : if (nlh->nlmsg_flags & NLM_F_EXCL ||
964 : !(nlh->nlmsg_flags & NLM_F_REPLACE))
965 : return -EEXIST;
966 0 : ifa = ifa_existing;
967 :
968 0 : if (ifa->ifa_rt_priority != new_metric) {
969 0 : fib_modify_prefix_metric(ifa, new_metric);
970 0 : ifa->ifa_rt_priority = new_metric;
971 : }
972 :
973 0 : set_ifa_lifetime(ifa, valid_lft, prefered_lft);
974 0 : cancel_delayed_work(&check_lifetime_work);
975 0 : queue_delayed_work(system_power_efficient_wq,
976 : &check_lifetime_work, 0);
977 0 : rtmsg_ifa(RTM_NEWADDR, ifa, nlh, NETLINK_CB(skb).portid);
978 : }
979 0 : return 0;
980 : }
981 :
982 : /*
983 : * Determine a default network mask, based on the IP address.
984 : */
985 :
986 0 : static int inet_abc_len(__be32 addr)
987 : {
988 0 : int rc = -1; /* Something else, probably a multicast. */
989 :
990 0 : if (ipv4_is_zeronet(addr) || ipv4_is_lbcast(addr))
991 : rc = 0;
992 : else {
993 0 : __u32 haddr = ntohl(addr);
994 0 : if (IN_CLASSA(haddr))
995 : rc = 8;
996 0 : else if (IN_CLASSB(haddr))
997 : rc = 16;
998 0 : else if (IN_CLASSC(haddr))
999 : rc = 24;
1000 0 : else if (IN_CLASSE(haddr))
1001 0 : rc = 32;
1002 : }
1003 :
1004 0 : return rc;
1005 : }
1006 :
1007 :
1008 0 : int devinet_ioctl(struct net *net, unsigned int cmd, struct ifreq *ifr)
1009 : {
1010 0 : struct sockaddr_in sin_orig;
1011 0 : struct sockaddr_in *sin = (struct sockaddr_in *)&ifr->ifr_addr;
1012 0 : struct in_ifaddr __rcu **ifap = NULL;
1013 0 : struct in_device *in_dev;
1014 0 : struct in_ifaddr *ifa = NULL;
1015 0 : struct net_device *dev;
1016 0 : char *colon;
1017 0 : int ret = -EFAULT;
1018 0 : int tryaddrmatch = 0;
1019 :
1020 0 : ifr->ifr_name[IFNAMSIZ - 1] = 0;
1021 :
1022 : /* save original address for comparison */
1023 0 : memcpy(&sin_orig, sin, sizeof(*sin));
1024 :
1025 0 : colon = strchr(ifr->ifr_name, ':');
1026 0 : if (colon)
1027 0 : *colon = 0;
1028 :
1029 0 : dev_load(net, ifr->ifr_name);
1030 :
1031 0 : switch (cmd) {
1032 0 : case SIOCGIFADDR: /* Get interface address */
1033 : case SIOCGIFBRDADDR: /* Get the broadcast address */
1034 : case SIOCGIFDSTADDR: /* Get the destination address */
1035 : case SIOCGIFNETMASK: /* Get the netmask for the interface */
1036 : /* Note that these ioctls will not sleep,
1037 : so that we do not impose a lock.
1038 : One day we will be forced to put shlock here (I mean SMP)
1039 : */
1040 0 : tryaddrmatch = (sin_orig.sin_family == AF_INET);
1041 0 : memset(sin, 0, sizeof(*sin));
1042 0 : sin->sin_family = AF_INET;
1043 0 : break;
1044 :
1045 0 : case SIOCSIFFLAGS:
1046 0 : ret = -EPERM;
1047 0 : if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1048 0 : goto out;
1049 : break;
1050 0 : case SIOCSIFADDR: /* Set interface address (and family) */
1051 : case SIOCSIFBRDADDR: /* Set the broadcast address */
1052 : case SIOCSIFDSTADDR: /* Set the destination address */
1053 : case SIOCSIFNETMASK: /* Set the netmask for the interface */
1054 0 : ret = -EPERM;
1055 0 : if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1056 0 : goto out;
1057 0 : ret = -EINVAL;
1058 0 : if (sin->sin_family != AF_INET)
1059 0 : goto out;
1060 : break;
1061 0 : default:
1062 0 : ret = -EINVAL;
1063 0 : goto out;
1064 : }
1065 :
1066 0 : rtnl_lock();
1067 :
1068 0 : ret = -ENODEV;
1069 0 : dev = __dev_get_by_name(net, ifr->ifr_name);
1070 0 : if (!dev)
1071 0 : goto done;
1072 :
1073 0 : if (colon)
1074 0 : *colon = ':';
1075 :
1076 0 : in_dev = __in_dev_get_rtnl(dev);
1077 0 : if (in_dev) {
1078 0 : if (tryaddrmatch) {
1079 : /* Matthias Andree */
1080 : /* compare label and address (4.4BSD style) */
1081 : /* note: we only do this for a limited set of ioctls
1082 : and only if the original address family was AF_INET.
1083 : This is checked above. */
1084 :
1085 0 : for (ifap = &in_dev->ifa_list;
1086 0 : (ifa = rtnl_dereference(*ifap)) != NULL;
1087 0 : ifap = &ifa->ifa_next) {
1088 0 : if (!strcmp(ifr->ifr_name, ifa->ifa_label) &&
1089 : sin_orig.sin_addr.s_addr ==
1090 0 : ifa->ifa_local) {
1091 : break; /* found */
1092 : }
1093 : }
1094 : }
1095 : /* we didn't get a match, maybe the application is
1096 : 4.3BSD-style and passed in junk so we fall back to
1097 : comparing just the label */
1098 0 : if (!ifa) {
1099 0 : for (ifap = &in_dev->ifa_list;
1100 0 : (ifa = rtnl_dereference(*ifap)) != NULL;
1101 0 : ifap = &ifa->ifa_next)
1102 0 : if (!strcmp(ifr->ifr_name, ifa->ifa_label))
1103 : break;
1104 : }
1105 : }
1106 :
1107 0 : ret = -EADDRNOTAVAIL;
1108 0 : if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS)
1109 0 : goto done;
1110 :
1111 0 : switch (cmd) {
1112 0 : case SIOCGIFADDR: /* Get interface address */
1113 0 : ret = 0;
1114 0 : sin->sin_addr.s_addr = ifa->ifa_local;
1115 0 : break;
1116 :
1117 0 : case SIOCGIFBRDADDR: /* Get the broadcast address */
1118 0 : ret = 0;
1119 0 : sin->sin_addr.s_addr = ifa->ifa_broadcast;
1120 0 : break;
1121 :
1122 0 : case SIOCGIFDSTADDR: /* Get the destination address */
1123 0 : ret = 0;
1124 0 : sin->sin_addr.s_addr = ifa->ifa_address;
1125 0 : break;
1126 :
1127 0 : case SIOCGIFNETMASK: /* Get the netmask for the interface */
1128 0 : ret = 0;
1129 0 : sin->sin_addr.s_addr = ifa->ifa_mask;
1130 0 : break;
1131 :
1132 0 : case SIOCSIFFLAGS:
1133 0 : if (colon) {
1134 0 : ret = -EADDRNOTAVAIL;
1135 0 : if (!ifa)
1136 : break;
1137 0 : ret = 0;
1138 0 : if (!(ifr->ifr_flags & IFF_UP))
1139 0 : inet_del_ifa(in_dev, ifap, 1);
1140 : break;
1141 : }
1142 0 : ret = dev_change_flags(dev, ifr->ifr_flags, NULL);
1143 0 : break;
1144 :
1145 0 : case SIOCSIFADDR: /* Set interface address (and family) */
1146 0 : ret = -EINVAL;
1147 0 : if (inet_abc_len(sin->sin_addr.s_addr) < 0)
1148 : break;
1149 :
1150 0 : if (!ifa) {
1151 0 : ret = -ENOBUFS;
1152 0 : ifa = inet_alloc_ifa();
1153 0 : if (!ifa)
1154 : break;
1155 0 : INIT_HLIST_NODE(&ifa->hash);
1156 0 : if (colon)
1157 0 : memcpy(ifa->ifa_label, ifr->ifr_name, IFNAMSIZ);
1158 : else
1159 0 : memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1160 : } else {
1161 0 : ret = 0;
1162 0 : if (ifa->ifa_local == sin->sin_addr.s_addr)
1163 : break;
1164 0 : inet_del_ifa(in_dev, ifap, 0);
1165 0 : ifa->ifa_broadcast = 0;
1166 0 : ifa->ifa_scope = 0;
1167 : }
1168 :
1169 0 : ifa->ifa_address = ifa->ifa_local = sin->sin_addr.s_addr;
1170 :
1171 0 : if (!(dev->flags & IFF_POINTOPOINT)) {
1172 0 : ifa->ifa_prefixlen = inet_abc_len(ifa->ifa_address);
1173 0 : ifa->ifa_mask = inet_make_mask(ifa->ifa_prefixlen);
1174 0 : if ((dev->flags & IFF_BROADCAST) &&
1175 : ifa->ifa_prefixlen < 31)
1176 0 : ifa->ifa_broadcast = ifa->ifa_address |
1177 0 : ~ifa->ifa_mask;
1178 : } else {
1179 0 : ifa->ifa_prefixlen = 32;
1180 0 : ifa->ifa_mask = inet_make_mask(32);
1181 : }
1182 0 : set_ifa_lifetime(ifa, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1183 0 : ret = inet_set_ifa(dev, ifa);
1184 0 : break;
1185 :
1186 0 : case SIOCSIFBRDADDR: /* Set the broadcast address */
1187 0 : ret = 0;
1188 0 : if (ifa->ifa_broadcast != sin->sin_addr.s_addr) {
1189 0 : inet_del_ifa(in_dev, ifap, 0);
1190 0 : ifa->ifa_broadcast = sin->sin_addr.s_addr;
1191 0 : inet_insert_ifa(ifa);
1192 : }
1193 : break;
1194 :
1195 0 : case SIOCSIFDSTADDR: /* Set the destination address */
1196 0 : ret = 0;
1197 0 : if (ifa->ifa_address == sin->sin_addr.s_addr)
1198 : break;
1199 0 : ret = -EINVAL;
1200 0 : if (inet_abc_len(sin->sin_addr.s_addr) < 0)
1201 : break;
1202 0 : ret = 0;
1203 0 : inet_del_ifa(in_dev, ifap, 0);
1204 0 : ifa->ifa_address = sin->sin_addr.s_addr;
1205 0 : inet_insert_ifa(ifa);
1206 0 : break;
1207 :
1208 0 : case SIOCSIFNETMASK: /* Set the netmask for the interface */
1209 :
1210 : /*
1211 : * The mask we set must be legal.
1212 : */
1213 0 : ret = -EINVAL;
1214 0 : if (bad_mask(sin->sin_addr.s_addr, 0))
1215 : break;
1216 0 : ret = 0;
1217 0 : if (ifa->ifa_mask != sin->sin_addr.s_addr) {
1218 0 : __be32 old_mask = ifa->ifa_mask;
1219 0 : inet_del_ifa(in_dev, ifap, 0);
1220 0 : ifa->ifa_mask = sin->sin_addr.s_addr;
1221 0 : ifa->ifa_prefixlen = inet_mask_len(ifa->ifa_mask);
1222 :
1223 : /* See if current broadcast address matches
1224 : * with current netmask, then recalculate
1225 : * the broadcast address. Otherwise it's a
1226 : * funny address, so don't touch it since
1227 : * the user seems to know what (s)he's doing...
1228 : */
1229 0 : if ((dev->flags & IFF_BROADCAST) &&
1230 0 : (ifa->ifa_prefixlen < 31) &&
1231 0 : (ifa->ifa_broadcast ==
1232 0 : (ifa->ifa_local|~old_mask))) {
1233 0 : ifa->ifa_broadcast = (ifa->ifa_local |
1234 0 : ~sin->sin_addr.s_addr);
1235 : }
1236 0 : inet_insert_ifa(ifa);
1237 : }
1238 : break;
1239 : }
1240 0 : done:
1241 0 : rtnl_unlock();
1242 0 : out:
1243 0 : return ret;
1244 : }
1245 :
1246 0 : static int inet_gifconf(struct net_device *dev, char __user *buf, int len, int size)
1247 : {
1248 0 : struct in_device *in_dev = __in_dev_get_rtnl(dev);
1249 0 : const struct in_ifaddr *ifa;
1250 0 : struct ifreq ifr;
1251 0 : int done = 0;
1252 :
1253 0 : if (WARN_ON(size > sizeof(struct ifreq)))
1254 0 : goto out;
1255 :
1256 0 : if (!in_dev)
1257 0 : goto out;
1258 :
1259 0 : in_dev_for_each_ifa_rtnl(ifa, in_dev) {
1260 0 : if (!buf) {
1261 0 : done += size;
1262 0 : continue;
1263 : }
1264 0 : if (len < size)
1265 : break;
1266 0 : memset(&ifr, 0, sizeof(struct ifreq));
1267 0 : strcpy(ifr.ifr_name, ifa->ifa_label);
1268 :
1269 0 : (*(struct sockaddr_in *)&ifr.ifr_addr).sin_family = AF_INET;
1270 0 : (*(struct sockaddr_in *)&ifr.ifr_addr).sin_addr.s_addr =
1271 0 : ifa->ifa_local;
1272 :
1273 0 : if (copy_to_user(buf + done, &ifr, size)) {
1274 : done = -EFAULT;
1275 : break;
1276 : }
1277 0 : len -= size;
1278 0 : done += size;
1279 : }
1280 0 : out:
1281 0 : return done;
1282 : }
1283 :
1284 4 : static __be32 in_dev_select_addr(const struct in_device *in_dev,
1285 : int scope)
1286 : {
1287 4 : const struct in_ifaddr *ifa;
1288 :
1289 12 : in_dev_for_each_ifa_rcu(ifa, in_dev) {
1290 2 : if (ifa->ifa_flags & IFA_F_SECONDARY)
1291 0 : continue;
1292 2 : if (ifa->ifa_scope != RT_SCOPE_LINK &&
1293 2 : ifa->ifa_scope <= scope)
1294 0 : return ifa->ifa_local;
1295 : }
1296 :
1297 : return 0;
1298 : }
1299 :
1300 14 : __be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope)
1301 : {
1302 14 : const struct in_ifaddr *ifa;
1303 14 : __be32 addr = 0;
1304 14 : unsigned char localnet_scope = RT_SCOPE_HOST;
1305 14 : struct in_device *in_dev;
1306 14 : struct net *net = dev_net(dev);
1307 14 : int master_idx;
1308 :
1309 14 : rcu_read_lock();
1310 14 : in_dev = __in_dev_get_rcu(dev);
1311 14 : if (!in_dev)
1312 0 : goto no_in_dev;
1313 :
1314 14 : if (unlikely(IN_DEV_ROUTE_LOCALNET(in_dev)))
1315 : localnet_scope = RT_SCOPE_LINK;
1316 :
1317 32 : in_dev_for_each_ifa_rcu(ifa, in_dev) {
1318 14 : if (ifa->ifa_flags & IFA_F_SECONDARY)
1319 0 : continue;
1320 14 : if (min(ifa->ifa_scope, localnet_scope) > scope)
1321 2 : continue;
1322 12 : if (!dst || inet_ifa_match(dst, ifa)) {
1323 12 : addr = ifa->ifa_local;
1324 12 : break;
1325 : }
1326 0 : if (!addr)
1327 0 : addr = ifa->ifa_local;
1328 : }
1329 :
1330 14 : if (addr)
1331 12 : goto out_unlock;
1332 2 : no_in_dev:
1333 2 : master_idx = l3mdev_master_ifindex_rcu(dev);
1334 :
1335 : /* For VRFs, the VRF device takes the place of the loopback device,
1336 : * with addresses on it being preferred. Note in such cases the
1337 : * loopback device will be among the devices that fail the master_idx
1338 : * equality check in the loop below.
1339 : */
1340 2 : if (master_idx &&
1341 : (dev = dev_get_by_index_rcu(net, master_idx)) &&
1342 : (in_dev = __in_dev_get_rcu(dev))) {
1343 : addr = in_dev_select_addr(in_dev, scope);
1344 : if (addr)
1345 : goto out_unlock;
1346 : }
1347 :
1348 : /* Not loopback addresses on loopback should be preferred
1349 : in this case. It is important that lo is the first interface
1350 : in dev_base list.
1351 : */
1352 6 : for_each_netdev_rcu(net, dev) {
1353 4 : if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1354 : continue;
1355 :
1356 4 : in_dev = __in_dev_get_rcu(dev);
1357 4 : if (!in_dev)
1358 0 : continue;
1359 :
1360 4 : addr = in_dev_select_addr(in_dev, scope);
1361 4 : if (addr)
1362 0 : goto out_unlock;
1363 : }
1364 2 : out_unlock:
1365 14 : rcu_read_unlock();
1366 14 : return addr;
1367 : }
1368 : EXPORT_SYMBOL(inet_select_addr);
1369 :
1370 0 : static __be32 confirm_addr_indev(struct in_device *in_dev, __be32 dst,
1371 : __be32 local, int scope)
1372 : {
1373 0 : unsigned char localnet_scope = RT_SCOPE_HOST;
1374 0 : const struct in_ifaddr *ifa;
1375 0 : __be32 addr = 0;
1376 0 : int same = 0;
1377 :
1378 0 : if (unlikely(IN_DEV_ROUTE_LOCALNET(in_dev)))
1379 : localnet_scope = RT_SCOPE_LINK;
1380 :
1381 0 : in_dev_for_each_ifa_rcu(ifa, in_dev) {
1382 0 : unsigned char min_scope = min(ifa->ifa_scope, localnet_scope);
1383 :
1384 0 : if (!addr &&
1385 0 : (local == ifa->ifa_local || !local) &&
1386 : min_scope <= scope) {
1387 0 : addr = ifa->ifa_local;
1388 0 : if (same)
1389 : break;
1390 : }
1391 0 : if (!same) {
1392 0 : same = (!local || inet_ifa_match(local, ifa)) &&
1393 0 : (!dst || inet_ifa_match(dst, ifa));
1394 0 : if (same && addr) {
1395 0 : if (local || !dst)
1396 : break;
1397 : /* Is the selected addr into dst subnet? */
1398 0 : if (inet_ifa_match(addr, ifa))
1399 : break;
1400 : /* No, then can we use new local src? */
1401 0 : if (min_scope <= scope) {
1402 0 : addr = ifa->ifa_local;
1403 0 : break;
1404 : }
1405 : /* search for large dst subnet for addr */
1406 : same = 0;
1407 : }
1408 : }
1409 : }
1410 :
1411 0 : return same ? addr : 0;
1412 : }
1413 :
1414 : /*
1415 : * Confirm that local IP address exists using wildcards:
1416 : * - net: netns to check, cannot be NULL
1417 : * - in_dev: only on this interface, NULL=any interface
1418 : * - dst: only in the same subnet as dst, 0=any dst
1419 : * - local: address, 0=autoselect the local address
1420 : * - scope: maximum allowed scope value for the local address
1421 : */
1422 0 : __be32 inet_confirm_addr(struct net *net, struct in_device *in_dev,
1423 : __be32 dst, __be32 local, int scope)
1424 : {
1425 0 : __be32 addr = 0;
1426 0 : struct net_device *dev;
1427 :
1428 0 : if (in_dev)
1429 0 : return confirm_addr_indev(in_dev, dst, local, scope);
1430 :
1431 0 : rcu_read_lock();
1432 0 : for_each_netdev_rcu(net, dev) {
1433 0 : in_dev = __in_dev_get_rcu(dev);
1434 0 : if (in_dev) {
1435 0 : addr = confirm_addr_indev(in_dev, dst, local, scope);
1436 0 : if (addr)
1437 : break;
1438 : }
1439 : }
1440 0 : rcu_read_unlock();
1441 :
1442 0 : return addr;
1443 : }
1444 : EXPORT_SYMBOL(inet_confirm_addr);
1445 :
1446 : /*
1447 : * Device notifier
1448 : */
1449 :
1450 1 : int register_inetaddr_notifier(struct notifier_block *nb)
1451 : {
1452 1 : return blocking_notifier_chain_register(&inetaddr_chain, nb);
1453 : }
1454 : EXPORT_SYMBOL(register_inetaddr_notifier);
1455 :
1456 0 : int unregister_inetaddr_notifier(struct notifier_block *nb)
1457 : {
1458 0 : return blocking_notifier_chain_unregister(&inetaddr_chain, nb);
1459 : }
1460 : EXPORT_SYMBOL(unregister_inetaddr_notifier);
1461 :
1462 0 : int register_inetaddr_validator_notifier(struct notifier_block *nb)
1463 : {
1464 0 : return blocking_notifier_chain_register(&inetaddr_validator_chain, nb);
1465 : }
1466 : EXPORT_SYMBOL(register_inetaddr_validator_notifier);
1467 :
1468 0 : int unregister_inetaddr_validator_notifier(struct notifier_block *nb)
1469 : {
1470 0 : return blocking_notifier_chain_unregister(&inetaddr_validator_chain,
1471 : nb);
1472 : }
1473 : EXPORT_SYMBOL(unregister_inetaddr_validator_notifier);
1474 :
1475 : /* Rename ifa_labels for a device name change. Make some effort to preserve
1476 : * existing alias numbering and to create unique labels if possible.
1477 : */
1478 0 : static void inetdev_changename(struct net_device *dev, struct in_device *in_dev)
1479 : {
1480 0 : struct in_ifaddr *ifa;
1481 0 : int named = 0;
1482 :
1483 0 : in_dev_for_each_ifa_rtnl(ifa, in_dev) {
1484 0 : char old[IFNAMSIZ], *dot;
1485 :
1486 0 : memcpy(old, ifa->ifa_label, IFNAMSIZ);
1487 0 : memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1488 0 : if (named++ == 0)
1489 0 : goto skip;
1490 0 : dot = strchr(old, ':');
1491 0 : if (!dot) {
1492 0 : sprintf(old, ":%d", named);
1493 0 : dot = old;
1494 : }
1495 0 : if (strlen(dot) + strlen(dev->name) < IFNAMSIZ)
1496 0 : strcat(ifa->ifa_label, dot);
1497 : else
1498 0 : strcpy(ifa->ifa_label + (IFNAMSIZ - strlen(dot) - 1), dot);
1499 0 : skip:
1500 0 : rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0);
1501 : }
1502 0 : }
1503 :
1504 0 : static void inetdev_send_gratuitous_arp(struct net_device *dev,
1505 : struct in_device *in_dev)
1506 :
1507 : {
1508 0 : const struct in_ifaddr *ifa;
1509 :
1510 0 : in_dev_for_each_ifa_rtnl(ifa, in_dev) {
1511 0 : arp_send(ARPOP_REQUEST, ETH_P_ARP,
1512 : ifa->ifa_local, dev,
1513 : ifa->ifa_local, NULL,
1514 0 : dev->dev_addr, NULL);
1515 : }
1516 0 : }
1517 :
1518 : /* Called only under RTNL semaphore */
1519 :
1520 7 : static int inetdev_event(struct notifier_block *this, unsigned long event,
1521 : void *ptr)
1522 : {
1523 7 : struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1524 7 : struct in_device *in_dev = __in_dev_get_rtnl(dev);
1525 :
1526 7 : ASSERT_RTNL();
1527 :
1528 7 : if (!in_dev) {
1529 3 : if (event == NETDEV_REGISTER) {
1530 2 : in_dev = inetdev_init(dev);
1531 2 : if (IS_ERR(in_dev))
1532 0 : return notifier_from_errno(PTR_ERR(in_dev));
1533 2 : if (dev->flags & IFF_LOOPBACK) {
1534 1 : IN_DEV_CONF_SET(in_dev, NOXFRM, 1);
1535 1 : IN_DEV_CONF_SET(in_dev, NOPOLICY, 1);
1536 : }
1537 1 : } else if (event == NETDEV_CHANGEMTU) {
1538 : /* Re-enabling IP */
1539 0 : if (inetdev_valid_mtu(dev->mtu))
1540 0 : in_dev = inetdev_init(dev);
1541 : }
1542 3 : goto out;
1543 : }
1544 :
1545 4 : switch (event) {
1546 : case NETDEV_REGISTER:
1547 0 : pr_debug("%s: bug\n", __func__);
1548 0 : RCU_INIT_POINTER(dev->ip_ptr, NULL);
1549 0 : break;
1550 2 : case NETDEV_UP:
1551 2 : if (!inetdev_valid_mtu(dev->mtu))
1552 : break;
1553 2 : if (dev->flags & IFF_LOOPBACK) {
1554 1 : struct in_ifaddr *ifa = inet_alloc_ifa();
1555 :
1556 1 : if (ifa) {
1557 1 : INIT_HLIST_NODE(&ifa->hash);
1558 1 : ifa->ifa_local =
1559 1 : ifa->ifa_address = htonl(INADDR_LOOPBACK);
1560 1 : ifa->ifa_prefixlen = 8;
1561 1 : ifa->ifa_mask = inet_make_mask(8);
1562 1 : in_dev_hold(in_dev);
1563 1 : ifa->ifa_dev = in_dev;
1564 1 : ifa->ifa_scope = RT_SCOPE_HOST;
1565 1 : memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1566 1 : set_ifa_lifetime(ifa, INFINITY_LIFE_TIME,
1567 : INFINITY_LIFE_TIME);
1568 1 : ipv4_devconf_setall(in_dev);
1569 1 : neigh_parms_data_state_setall(in_dev->arp_parms);
1570 1 : inet_insert_ifa(ifa);
1571 : }
1572 : }
1573 2 : ip_mc_up(in_dev);
1574 2 : fallthrough;
1575 2 : case NETDEV_CHANGEADDR:
1576 2 : if (!IN_DEV_ARP_NOTIFY(in_dev))
1577 : break;
1578 0 : fallthrough;
1579 : case NETDEV_NOTIFY_PEERS:
1580 : /* Send gratuitous ARP to notify of link change */
1581 0 : inetdev_send_gratuitous_arp(dev, in_dev);
1582 0 : break;
1583 0 : case NETDEV_DOWN:
1584 0 : ip_mc_down(in_dev);
1585 0 : break;
1586 0 : case NETDEV_PRE_TYPE_CHANGE:
1587 0 : ip_mc_unmap(in_dev);
1588 0 : break;
1589 0 : case NETDEV_POST_TYPE_CHANGE:
1590 0 : ip_mc_remap(in_dev);
1591 0 : break;
1592 0 : case NETDEV_CHANGEMTU:
1593 0 : if (inetdev_valid_mtu(dev->mtu))
1594 : break;
1595 : /* disable IP when MTU is not enough */
1596 0 : fallthrough;
1597 : case NETDEV_UNREGISTER:
1598 0 : inetdev_destroy(in_dev);
1599 0 : break;
1600 0 : case NETDEV_CHANGENAME:
1601 : /* Do not notify about label change, this event is
1602 : * not interesting to applications using netlink.
1603 : */
1604 0 : inetdev_changename(dev, in_dev);
1605 :
1606 0 : devinet_sysctl_unregister(in_dev);
1607 0 : devinet_sysctl_register(in_dev);
1608 0 : break;
1609 : }
1610 2 : out:
1611 : return NOTIFY_DONE;
1612 : }
1613 :
1614 : static struct notifier_block ip_netdev_notifier = {
1615 : .notifier_call = inetdev_event,
1616 : };
1617 :
1618 2 : static size_t inet_nlmsg_size(void)
1619 : {
1620 2 : return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
1621 2 : + nla_total_size(4) /* IFA_ADDRESS */
1622 2 : + nla_total_size(4) /* IFA_LOCAL */
1623 2 : + nla_total_size(4) /* IFA_BROADCAST */
1624 2 : + nla_total_size(IFNAMSIZ) /* IFA_LABEL */
1625 2 : + nla_total_size(4) /* IFA_FLAGS */
1626 2 : + nla_total_size(4) /* IFA_RT_PRIORITY */
1627 2 : + nla_total_size(sizeof(struct ifa_cacheinfo)); /* IFA_CACHEINFO */
1628 : }
1629 :
1630 38 : static inline u32 cstamp_delta(unsigned long cstamp)
1631 : {
1632 38 : return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
1633 : }
1634 :
1635 38 : static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
1636 : unsigned long tstamp, u32 preferred, u32 valid)
1637 : {
1638 38 : struct ifa_cacheinfo ci;
1639 :
1640 38 : ci.cstamp = cstamp_delta(cstamp);
1641 38 : ci.tstamp = cstamp_delta(tstamp);
1642 38 : ci.ifa_prefered = preferred;
1643 38 : ci.ifa_valid = valid;
1644 :
1645 38 : return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
1646 : }
1647 :
1648 38 : static int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa,
1649 : struct inet_fill_args *args)
1650 : {
1651 38 : struct ifaddrmsg *ifm;
1652 38 : struct nlmsghdr *nlh;
1653 38 : u32 preferred, valid;
1654 :
1655 76 : nlh = nlmsg_put(skb, args->portid, args->seq, args->event, sizeof(*ifm),
1656 38 : args->flags);
1657 38 : if (!nlh)
1658 : return -EMSGSIZE;
1659 :
1660 38 : ifm = nlmsg_data(nlh);
1661 38 : ifm->ifa_family = AF_INET;
1662 38 : ifm->ifa_prefixlen = ifa->ifa_prefixlen;
1663 38 : ifm->ifa_flags = ifa->ifa_flags;
1664 38 : ifm->ifa_scope = ifa->ifa_scope;
1665 38 : ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
1666 :
1667 38 : if (args->netnsid >= 0 &&
1668 0 : nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid))
1669 0 : goto nla_put_failure;
1670 :
1671 38 : if (!(ifm->ifa_flags & IFA_F_PERMANENT)) {
1672 11 : preferred = ifa->ifa_preferred_lft;
1673 11 : valid = ifa->ifa_valid_lft;
1674 11 : if (preferred != INFINITY_LIFE_TIME) {
1675 11 : long tval = (jiffies - ifa->ifa_tstamp) / HZ;
1676 :
1677 11 : if (preferred > tval)
1678 11 : preferred -= tval;
1679 : else
1680 : preferred = 0;
1681 11 : if (valid != INFINITY_LIFE_TIME) {
1682 11 : if (valid > tval)
1683 11 : valid -= tval;
1684 : else
1685 : valid = 0;
1686 : }
1687 : }
1688 : } else {
1689 : preferred = INFINITY_LIFE_TIME;
1690 : valid = INFINITY_LIFE_TIME;
1691 : }
1692 38 : if ((ifa->ifa_address &&
1693 38 : nla_put_in_addr(skb, IFA_ADDRESS, ifa->ifa_address)) ||
1694 38 : (ifa->ifa_local &&
1695 38 : nla_put_in_addr(skb, IFA_LOCAL, ifa->ifa_local)) ||
1696 38 : (ifa->ifa_broadcast &&
1697 11 : nla_put_in_addr(skb, IFA_BROADCAST, ifa->ifa_broadcast)) ||
1698 76 : (ifa->ifa_label[0] &&
1699 38 : nla_put_string(skb, IFA_LABEL, ifa->ifa_label)) ||
1700 38 : nla_put_u32(skb, IFA_FLAGS, ifa->ifa_flags) ||
1701 38 : (ifa->ifa_rt_priority &&
1702 38 : nla_put_u32(skb, IFA_RT_PRIORITY, ifa->ifa_rt_priority)) ||
1703 38 : put_cacheinfo(skb, ifa->ifa_cstamp, ifa->ifa_tstamp,
1704 : preferred, valid))
1705 0 : goto nla_put_failure;
1706 :
1707 38 : nlmsg_end(skb, nlh);
1708 38 : return 0;
1709 :
1710 0 : nla_put_failure:
1711 0 : nlmsg_cancel(skb, nlh);
1712 0 : return -EMSGSIZE;
1713 : }
1714 :
1715 0 : static int inet_valid_dump_ifaddr_req(const struct nlmsghdr *nlh,
1716 : struct inet_fill_args *fillargs,
1717 : struct net **tgt_net, struct sock *sk,
1718 : struct netlink_callback *cb)
1719 : {
1720 0 : struct netlink_ext_ack *extack = cb->extack;
1721 0 : struct nlattr *tb[IFA_MAX+1];
1722 0 : struct ifaddrmsg *ifm;
1723 0 : int err, i;
1724 :
1725 0 : if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
1726 0 : NL_SET_ERR_MSG(extack, "ipv4: Invalid header for address dump request");
1727 0 : return -EINVAL;
1728 : }
1729 :
1730 0 : ifm = nlmsg_data(nlh);
1731 0 : if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
1732 0 : NL_SET_ERR_MSG(extack, "ipv4: Invalid values in header for address dump request");
1733 0 : return -EINVAL;
1734 : }
1735 :
1736 0 : fillargs->ifindex = ifm->ifa_index;
1737 0 : if (fillargs->ifindex) {
1738 0 : cb->answer_flags |= NLM_F_DUMP_FILTERED;
1739 0 : fillargs->flags |= NLM_F_DUMP_FILTERED;
1740 : }
1741 :
1742 0 : err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
1743 : ifa_ipv4_policy, extack);
1744 0 : if (err < 0)
1745 : return err;
1746 :
1747 0 : for (i = 0; i <= IFA_MAX; ++i) {
1748 0 : if (!tb[i])
1749 0 : continue;
1750 :
1751 0 : if (i == IFA_TARGET_NETNSID) {
1752 0 : struct net *net;
1753 :
1754 0 : fillargs->netnsid = nla_get_s32(tb[i]);
1755 :
1756 0 : net = rtnl_get_net_ns_capable(sk, fillargs->netnsid);
1757 0 : if (IS_ERR(net)) {
1758 0 : fillargs->netnsid = -1;
1759 0 : NL_SET_ERR_MSG(extack, "ipv4: Invalid target network namespace id");
1760 0 : return PTR_ERR(net);
1761 : }
1762 0 : *tgt_net = net;
1763 : } else {
1764 0 : NL_SET_ERR_MSG(extack, "ipv4: Unsupported attribute in dump request");
1765 0 : return -EINVAL;
1766 : }
1767 : }
1768 :
1769 : return 0;
1770 : }
1771 :
1772 52 : static int in_dev_dump_addr(struct in_device *in_dev, struct sk_buff *skb,
1773 : struct netlink_callback *cb, int s_ip_idx,
1774 : struct inet_fill_args *fillargs)
1775 : {
1776 52 : struct in_ifaddr *ifa;
1777 52 : int ip_idx = 0;
1778 52 : int err;
1779 :
1780 88 : in_dev_for_each_ifa_rtnl(ifa, in_dev) {
1781 36 : if (ip_idx < s_ip_idx) {
1782 0 : ip_idx++;
1783 0 : continue;
1784 : }
1785 36 : err = inet_fill_ifaddr(skb, ifa, fillargs);
1786 36 : if (err < 0)
1787 0 : goto done;
1788 :
1789 36 : nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1790 36 : ip_idx++;
1791 : }
1792 : err = 0;
1793 :
1794 52 : done:
1795 52 : cb->args[2] = ip_idx;
1796 :
1797 52 : return err;
1798 : }
1799 :
1800 52 : static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
1801 : {
1802 52 : const struct nlmsghdr *nlh = cb->nlh;
1803 52 : struct inet_fill_args fillargs = {
1804 52 : .portid = NETLINK_CB(cb->skb).portid,
1805 52 : .seq = nlh->nlmsg_seq,
1806 : .event = RTM_NEWADDR,
1807 : .flags = NLM_F_MULTI,
1808 : .netnsid = -1,
1809 : };
1810 52 : struct net *net = sock_net(skb->sk);
1811 52 : struct net *tgt_net = net;
1812 52 : int h, s_h;
1813 52 : int idx, s_idx;
1814 52 : int s_ip_idx;
1815 52 : struct net_device *dev;
1816 52 : struct in_device *in_dev;
1817 52 : struct hlist_head *head;
1818 52 : int err = 0;
1819 :
1820 52 : s_h = cb->args[0];
1821 52 : s_idx = idx = cb->args[1];
1822 52 : s_ip_idx = cb->args[2];
1823 :
1824 52 : if (cb->strict_check) {
1825 0 : err = inet_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net,
1826 : skb->sk, cb);
1827 0 : if (err < 0)
1828 0 : goto put_tgt_net;
1829 :
1830 0 : err = 0;
1831 0 : if (fillargs.ifindex) {
1832 0 : dev = __dev_get_by_index(tgt_net, fillargs.ifindex);
1833 0 : if (!dev) {
1834 0 : err = -ENODEV;
1835 0 : goto put_tgt_net;
1836 : }
1837 :
1838 0 : in_dev = __in_dev_get_rtnl(dev);
1839 0 : if (in_dev) {
1840 0 : err = in_dev_dump_addr(in_dev, skb, cb, s_ip_idx,
1841 : &fillargs);
1842 : }
1843 0 : goto put_tgt_net;
1844 : }
1845 : }
1846 :
1847 6708 : for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1848 6656 : idx = 0;
1849 6656 : head = &tgt_net->dev_index_head[h];
1850 6656 : rcu_read_lock();
1851 6656 : cb->seq = atomic_read(&tgt_net->ipv4.dev_addr_genid) ^
1852 6656 : tgt_net->dev_base_seq;
1853 13364 : hlist_for_each_entry_rcu(dev, head, index_hlist) {
1854 52 : if (idx < s_idx)
1855 0 : goto cont;
1856 52 : if (h > s_h || idx > s_idx)
1857 52 : s_ip_idx = 0;
1858 52 : in_dev = __in_dev_get_rcu(dev);
1859 52 : if (!in_dev)
1860 0 : goto cont;
1861 :
1862 52 : err = in_dev_dump_addr(in_dev, skb, cb, s_ip_idx,
1863 : &fillargs);
1864 52 : if (err < 0) {
1865 0 : rcu_read_unlock();
1866 0 : goto done;
1867 : }
1868 52 : cont:
1869 52 : idx++;
1870 : }
1871 6656 : rcu_read_unlock();
1872 : }
1873 :
1874 52 : done:
1875 52 : cb->args[0] = h;
1876 52 : cb->args[1] = idx;
1877 52 : put_tgt_net:
1878 52 : if (fillargs.netnsid >= 0)
1879 52 : put_net(tgt_net);
1880 :
1881 52 : return skb->len ? : err;
1882 : }
1883 :
1884 2 : static void rtmsg_ifa(int event, struct in_ifaddr *ifa, struct nlmsghdr *nlh,
1885 : u32 portid)
1886 : {
1887 4 : struct inet_fill_args fillargs = {
1888 : .portid = portid,
1889 2 : .seq = nlh ? nlh->nlmsg_seq : 0,
1890 : .event = event,
1891 : .flags = 0,
1892 : .netnsid = -1,
1893 : };
1894 2 : struct sk_buff *skb;
1895 2 : int err = -ENOBUFS;
1896 2 : struct net *net;
1897 :
1898 2 : net = dev_net(ifa->ifa_dev->dev);
1899 2 : skb = nlmsg_new(inet_nlmsg_size(), GFP_KERNEL);
1900 2 : if (!skb)
1901 0 : goto errout;
1902 :
1903 2 : err = inet_fill_ifaddr(skb, ifa, &fillargs);
1904 2 : if (err < 0) {
1905 : /* -EMSGSIZE implies BUG in inet_nlmsg_size() */
1906 0 : WARN_ON(err == -EMSGSIZE);
1907 0 : kfree_skb(skb);
1908 0 : goto errout;
1909 : }
1910 2 : rtnl_notify(skb, net, portid, RTNLGRP_IPV4_IFADDR, nlh, GFP_KERNEL);
1911 2 : return;
1912 0 : errout:
1913 0 : if (err < 0)
1914 0 : rtnl_set_sk_err(net, RTNLGRP_IPV4_IFADDR, err);
1915 : }
1916 :
1917 3 : static size_t inet_get_link_af_size(const struct net_device *dev,
1918 : u32 ext_filter_mask)
1919 : {
1920 3 : struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr);
1921 :
1922 3 : if (!in_dev)
1923 0 : return 0;
1924 :
1925 3 : return nla_total_size(IPV4_DEVCONF_MAX * 4); /* IFLA_INET_CONF */
1926 : }
1927 :
1928 15 : static int inet_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
1929 : u32 ext_filter_mask)
1930 : {
1931 15 : struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr);
1932 15 : struct nlattr *nla;
1933 15 : int i;
1934 :
1935 15 : if (!in_dev)
1936 : return -ENODATA;
1937 :
1938 15 : nla = nla_reserve(skb, IFLA_INET_CONF, IPV4_DEVCONF_MAX * 4);
1939 15 : if (!nla)
1940 : return -EMSGSIZE;
1941 :
1942 495 : for (i = 0; i < IPV4_DEVCONF_MAX; i++)
1943 480 : ((u32 *) nla_data(nla))[i] = in_dev->cnf.data[i];
1944 :
1945 : return 0;
1946 : }
1947 :
1948 : static const struct nla_policy inet_af_policy[IFLA_INET_MAX+1] = {
1949 : [IFLA_INET_CONF] = { .type = NLA_NESTED },
1950 : };
1951 :
1952 0 : static int inet_validate_link_af(const struct net_device *dev,
1953 : const struct nlattr *nla)
1954 : {
1955 0 : struct nlattr *a, *tb[IFLA_INET_MAX+1];
1956 0 : int err, rem;
1957 :
1958 0 : if (dev && !__in_dev_get_rcu(dev))
1959 : return -EAFNOSUPPORT;
1960 :
1961 0 : err = nla_parse_nested_deprecated(tb, IFLA_INET_MAX, nla,
1962 : inet_af_policy, NULL);
1963 0 : if (err < 0)
1964 : return err;
1965 :
1966 0 : if (tb[IFLA_INET_CONF]) {
1967 0 : nla_for_each_nested(a, tb[IFLA_INET_CONF], rem) {
1968 0 : int cfgid = nla_type(a);
1969 :
1970 0 : if (nla_len(a) < 4)
1971 : return -EINVAL;
1972 :
1973 0 : if (cfgid <= 0 || cfgid > IPV4_DEVCONF_MAX)
1974 : return -EINVAL;
1975 : }
1976 : }
1977 :
1978 : return 0;
1979 : }
1980 :
1981 0 : static int inet_set_link_af(struct net_device *dev, const struct nlattr *nla)
1982 : {
1983 0 : struct in_device *in_dev = __in_dev_get_rcu(dev);
1984 0 : struct nlattr *a, *tb[IFLA_INET_MAX+1];
1985 0 : int rem;
1986 :
1987 0 : if (!in_dev)
1988 : return -EAFNOSUPPORT;
1989 :
1990 0 : if (nla_parse_nested_deprecated(tb, IFLA_INET_MAX, nla, NULL, NULL) < 0)
1991 0 : BUG();
1992 :
1993 0 : if (tb[IFLA_INET_CONF]) {
1994 0 : nla_for_each_nested(a, tb[IFLA_INET_CONF], rem)
1995 0 : ipv4_devconf_set(in_dev, nla_type(a), nla_get_u32(a));
1996 : }
1997 :
1998 : return 0;
1999 : }
2000 :
2001 4 : static int inet_netconf_msgsize_devconf(int type)
2002 : {
2003 4 : int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
2004 4 : + nla_total_size(4); /* NETCONFA_IFINDEX */
2005 4 : bool all = false;
2006 :
2007 4 : if (type == NETCONFA_ALL)
2008 4 : all = true;
2009 :
2010 4 : if (all || type == NETCONFA_FORWARDING)
2011 4 : size += nla_total_size(4);
2012 4 : if (all || type == NETCONFA_RP_FILTER)
2013 4 : size += nla_total_size(4);
2014 4 : if (all || type == NETCONFA_MC_FORWARDING)
2015 4 : size += nla_total_size(4);
2016 4 : if (all || type == NETCONFA_BC_FORWARDING)
2017 4 : size += nla_total_size(4);
2018 4 : if (all || type == NETCONFA_PROXY_NEIGH)
2019 4 : size += nla_total_size(4);
2020 4 : if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
2021 4 : size += nla_total_size(4);
2022 :
2023 0 : return size;
2024 : }
2025 :
2026 4 : static int inet_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
2027 : struct ipv4_devconf *devconf, u32 portid,
2028 : u32 seq, int event, unsigned int flags,
2029 : int type)
2030 : {
2031 4 : struct nlmsghdr *nlh;
2032 4 : struct netconfmsg *ncm;
2033 4 : bool all = false;
2034 :
2035 4 : nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
2036 : flags);
2037 4 : if (!nlh)
2038 : return -EMSGSIZE;
2039 :
2040 4 : if (type == NETCONFA_ALL)
2041 4 : all = true;
2042 :
2043 4 : ncm = nlmsg_data(nlh);
2044 4 : ncm->ncm_family = AF_INET;
2045 :
2046 4 : if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
2047 0 : goto nla_put_failure;
2048 :
2049 4 : if (!devconf)
2050 0 : goto out;
2051 :
2052 4 : if ((all || type == NETCONFA_FORWARDING) &&
2053 4 : nla_put_s32(skb, NETCONFA_FORWARDING,
2054 : IPV4_DEVCONF(*devconf, FORWARDING)) < 0)
2055 0 : goto nla_put_failure;
2056 4 : if ((all || type == NETCONFA_RP_FILTER) &&
2057 4 : nla_put_s32(skb, NETCONFA_RP_FILTER,
2058 : IPV4_DEVCONF(*devconf, RP_FILTER)) < 0)
2059 0 : goto nla_put_failure;
2060 4 : if ((all || type == NETCONFA_MC_FORWARDING) &&
2061 4 : nla_put_s32(skb, NETCONFA_MC_FORWARDING,
2062 : IPV4_DEVCONF(*devconf, MC_FORWARDING)) < 0)
2063 0 : goto nla_put_failure;
2064 4 : if ((all || type == NETCONFA_BC_FORWARDING) &&
2065 4 : nla_put_s32(skb, NETCONFA_BC_FORWARDING,
2066 : IPV4_DEVCONF(*devconf, BC_FORWARDING)) < 0)
2067 0 : goto nla_put_failure;
2068 4 : if ((all || type == NETCONFA_PROXY_NEIGH) &&
2069 4 : nla_put_s32(skb, NETCONFA_PROXY_NEIGH,
2070 : IPV4_DEVCONF(*devconf, PROXY_ARP)) < 0)
2071 0 : goto nla_put_failure;
2072 4 : if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
2073 4 : nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
2074 : IPV4_DEVCONF(*devconf, IGNORE_ROUTES_WITH_LINKDOWN)) < 0)
2075 0 : goto nla_put_failure;
2076 :
2077 4 : out:
2078 4 : nlmsg_end(skb, nlh);
2079 4 : return 0;
2080 :
2081 0 : nla_put_failure:
2082 0 : nlmsg_cancel(skb, nlh);
2083 0 : return -EMSGSIZE;
2084 : }
2085 :
2086 4 : void inet_netconf_notify_devconf(struct net *net, int event, int type,
2087 : int ifindex, struct ipv4_devconf *devconf)
2088 : {
2089 4 : struct sk_buff *skb;
2090 4 : int err = -ENOBUFS;
2091 :
2092 4 : skb = nlmsg_new(inet_netconf_msgsize_devconf(type), GFP_KERNEL);
2093 4 : if (!skb)
2094 0 : goto errout;
2095 :
2096 4 : err = inet_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
2097 : event, 0, type);
2098 4 : if (err < 0) {
2099 : /* -EMSGSIZE implies BUG in inet_netconf_msgsize_devconf() */
2100 0 : WARN_ON(err == -EMSGSIZE);
2101 0 : kfree_skb(skb);
2102 0 : goto errout;
2103 : }
2104 4 : rtnl_notify(skb, net, 0, RTNLGRP_IPV4_NETCONF, NULL, GFP_KERNEL);
2105 4 : return;
2106 0 : errout:
2107 0 : if (err < 0)
2108 0 : rtnl_set_sk_err(net, RTNLGRP_IPV4_NETCONF, err);
2109 : }
2110 :
2111 : static const struct nla_policy devconf_ipv4_policy[NETCONFA_MAX+1] = {
2112 : [NETCONFA_IFINDEX] = { .len = sizeof(int) },
2113 : [NETCONFA_FORWARDING] = { .len = sizeof(int) },
2114 : [NETCONFA_RP_FILTER] = { .len = sizeof(int) },
2115 : [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
2116 : [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
2117 : };
2118 :
2119 0 : static int inet_netconf_valid_get_req(struct sk_buff *skb,
2120 : const struct nlmsghdr *nlh,
2121 : struct nlattr **tb,
2122 : struct netlink_ext_ack *extack)
2123 : {
2124 0 : int i, err;
2125 :
2126 0 : if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) {
2127 0 : NL_SET_ERR_MSG(extack, "ipv4: Invalid header for netconf get request");
2128 0 : return -EINVAL;
2129 : }
2130 :
2131 0 : if (!netlink_strict_get_check(skb))
2132 0 : return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg),
2133 : tb, NETCONFA_MAX,
2134 : devconf_ipv4_policy, extack);
2135 :
2136 0 : err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg),
2137 : tb, NETCONFA_MAX,
2138 : devconf_ipv4_policy, extack);
2139 0 : if (err)
2140 : return err;
2141 :
2142 0 : for (i = 0; i <= NETCONFA_MAX; i++) {
2143 0 : if (!tb[i])
2144 0 : continue;
2145 :
2146 0 : switch (i) {
2147 : case NETCONFA_IFINDEX:
2148 : break;
2149 0 : default:
2150 0 : NL_SET_ERR_MSG(extack, "ipv4: Unsupported attribute in netconf get request");
2151 : return -EINVAL;
2152 : }
2153 : }
2154 :
2155 : return 0;
2156 : }
2157 :
2158 0 : static int inet_netconf_get_devconf(struct sk_buff *in_skb,
2159 : struct nlmsghdr *nlh,
2160 : struct netlink_ext_ack *extack)
2161 : {
2162 0 : struct net *net = sock_net(in_skb->sk);
2163 0 : struct nlattr *tb[NETCONFA_MAX+1];
2164 0 : struct sk_buff *skb;
2165 0 : struct ipv4_devconf *devconf;
2166 0 : struct in_device *in_dev;
2167 0 : struct net_device *dev;
2168 0 : int ifindex;
2169 0 : int err;
2170 :
2171 0 : err = inet_netconf_valid_get_req(in_skb, nlh, tb, extack);
2172 0 : if (err)
2173 0 : goto errout;
2174 :
2175 0 : err = -EINVAL;
2176 0 : if (!tb[NETCONFA_IFINDEX])
2177 0 : goto errout;
2178 :
2179 0 : ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
2180 0 : switch (ifindex) {
2181 0 : case NETCONFA_IFINDEX_ALL:
2182 0 : devconf = net->ipv4.devconf_all;
2183 0 : break;
2184 0 : case NETCONFA_IFINDEX_DEFAULT:
2185 0 : devconf = net->ipv4.devconf_dflt;
2186 0 : break;
2187 0 : default:
2188 0 : dev = __dev_get_by_index(net, ifindex);
2189 0 : if (!dev)
2190 0 : goto errout;
2191 0 : in_dev = __in_dev_get_rtnl(dev);
2192 0 : if (!in_dev)
2193 0 : goto errout;
2194 0 : devconf = &in_dev->cnf;
2195 0 : break;
2196 : }
2197 :
2198 0 : err = -ENOBUFS;
2199 0 : skb = nlmsg_new(inet_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL);
2200 0 : if (!skb)
2201 0 : goto errout;
2202 :
2203 0 : err = inet_netconf_fill_devconf(skb, ifindex, devconf,
2204 : NETLINK_CB(in_skb).portid,
2205 : nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
2206 : NETCONFA_ALL);
2207 0 : if (err < 0) {
2208 : /* -EMSGSIZE implies BUG in inet_netconf_msgsize_devconf() */
2209 0 : WARN_ON(err == -EMSGSIZE);
2210 0 : kfree_skb(skb);
2211 0 : goto errout;
2212 : }
2213 0 : err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
2214 0 : errout:
2215 0 : return err;
2216 : }
2217 :
2218 0 : static int inet_netconf_dump_devconf(struct sk_buff *skb,
2219 : struct netlink_callback *cb)
2220 : {
2221 0 : const struct nlmsghdr *nlh = cb->nlh;
2222 0 : struct net *net = sock_net(skb->sk);
2223 0 : int h, s_h;
2224 0 : int idx, s_idx;
2225 0 : struct net_device *dev;
2226 0 : struct in_device *in_dev;
2227 0 : struct hlist_head *head;
2228 :
2229 0 : if (cb->strict_check) {
2230 0 : struct netlink_ext_ack *extack = cb->extack;
2231 0 : struct netconfmsg *ncm;
2232 :
2233 0 : if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) {
2234 0 : NL_SET_ERR_MSG(extack, "ipv4: Invalid header for netconf dump request");
2235 0 : return -EINVAL;
2236 : }
2237 :
2238 0 : if (nlmsg_attrlen(nlh, sizeof(*ncm))) {
2239 0 : NL_SET_ERR_MSG(extack, "ipv4: Invalid data after header in netconf dump request");
2240 0 : return -EINVAL;
2241 : }
2242 : }
2243 :
2244 0 : s_h = cb->args[0];
2245 0 : s_idx = idx = cb->args[1];
2246 :
2247 0 : for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
2248 0 : idx = 0;
2249 0 : head = &net->dev_index_head[h];
2250 0 : rcu_read_lock();
2251 0 : cb->seq = atomic_read(&net->ipv4.dev_addr_genid) ^
2252 0 : net->dev_base_seq;
2253 0 : hlist_for_each_entry_rcu(dev, head, index_hlist) {
2254 0 : if (idx < s_idx)
2255 0 : goto cont;
2256 0 : in_dev = __in_dev_get_rcu(dev);
2257 0 : if (!in_dev)
2258 0 : goto cont;
2259 :
2260 0 : if (inet_netconf_fill_devconf(skb, dev->ifindex,
2261 : &in_dev->cnf,
2262 0 : NETLINK_CB(cb->skb).portid,
2263 : nlh->nlmsg_seq,
2264 : RTM_NEWNETCONF,
2265 : NLM_F_MULTI,
2266 : NETCONFA_ALL) < 0) {
2267 0 : rcu_read_unlock();
2268 0 : goto done;
2269 : }
2270 0 : nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2271 0 : cont:
2272 0 : idx++;
2273 : }
2274 0 : rcu_read_unlock();
2275 : }
2276 0 : if (h == NETDEV_HASHENTRIES) {
2277 0 : if (inet_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
2278 : net->ipv4.devconf_all,
2279 0 : NETLINK_CB(cb->skb).portid,
2280 : nlh->nlmsg_seq,
2281 : RTM_NEWNETCONF, NLM_F_MULTI,
2282 : NETCONFA_ALL) < 0)
2283 0 : goto done;
2284 : else
2285 : h++;
2286 : }
2287 0 : if (h == NETDEV_HASHENTRIES + 1) {
2288 0 : if (inet_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
2289 : net->ipv4.devconf_dflt,
2290 0 : NETLINK_CB(cb->skb).portid,
2291 : nlh->nlmsg_seq,
2292 : RTM_NEWNETCONF, NLM_F_MULTI,
2293 : NETCONFA_ALL) < 0)
2294 0 : goto done;
2295 : else
2296 : h++;
2297 : }
2298 0 : done:
2299 0 : cb->args[0] = h;
2300 0 : cb->args[1] = idx;
2301 :
2302 0 : return skb->len;
2303 : }
2304 :
2305 : #ifdef CONFIG_SYSCTL
2306 :
2307 0 : static void devinet_copy_dflt_conf(struct net *net, int i)
2308 : {
2309 0 : struct net_device *dev;
2310 :
2311 0 : rcu_read_lock();
2312 0 : for_each_netdev_rcu(net, dev) {
2313 0 : struct in_device *in_dev;
2314 :
2315 0 : in_dev = __in_dev_get_rcu(dev);
2316 0 : if (in_dev && !test_bit(i, in_dev->cnf.state))
2317 0 : in_dev->cnf.data[i] = net->ipv4.devconf_dflt->data[i];
2318 : }
2319 0 : rcu_read_unlock();
2320 0 : }
2321 :
2322 : /* called with RTNL locked */
2323 0 : static void inet_forward_change(struct net *net)
2324 : {
2325 0 : struct net_device *dev;
2326 0 : int on = IPV4_DEVCONF_ALL(net, FORWARDING);
2327 :
2328 0 : IPV4_DEVCONF_ALL(net, ACCEPT_REDIRECTS) = !on;
2329 0 : IPV4_DEVCONF_DFLT(net, FORWARDING) = on;
2330 0 : inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
2331 : NETCONFA_FORWARDING,
2332 : NETCONFA_IFINDEX_ALL,
2333 : net->ipv4.devconf_all);
2334 0 : inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
2335 : NETCONFA_FORWARDING,
2336 : NETCONFA_IFINDEX_DEFAULT,
2337 : net->ipv4.devconf_dflt);
2338 :
2339 0 : for_each_netdev(net, dev) {
2340 0 : struct in_device *in_dev;
2341 :
2342 0 : if (on)
2343 0 : dev_disable_lro(dev);
2344 :
2345 0 : in_dev = __in_dev_get_rtnl(dev);
2346 0 : if (in_dev) {
2347 0 : IN_DEV_CONF_SET(in_dev, FORWARDING, on);
2348 0 : inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
2349 : NETCONFA_FORWARDING,
2350 : dev->ifindex, &in_dev->cnf);
2351 : }
2352 : }
2353 0 : }
2354 :
2355 0 : static int devinet_conf_ifindex(struct net *net, struct ipv4_devconf *cnf)
2356 : {
2357 0 : if (cnf == net->ipv4.devconf_dflt)
2358 : return NETCONFA_IFINDEX_DEFAULT;
2359 0 : else if (cnf == net->ipv4.devconf_all)
2360 : return NETCONFA_IFINDEX_ALL;
2361 : else {
2362 0 : struct in_device *idev
2363 0 : = container_of(cnf, struct in_device, cnf);
2364 0 : return idev->dev->ifindex;
2365 : }
2366 : }
2367 :
2368 0 : static int devinet_conf_proc(struct ctl_table *ctl, int write,
2369 : void *buffer, size_t *lenp, loff_t *ppos)
2370 : {
2371 0 : int old_value = *(int *)ctl->data;
2372 0 : int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
2373 0 : int new_value = *(int *)ctl->data;
2374 :
2375 0 : if (write) {
2376 0 : struct ipv4_devconf *cnf = ctl->extra1;
2377 0 : struct net *net = ctl->extra2;
2378 0 : int i = (int *)ctl->data - cnf->data;
2379 0 : int ifindex;
2380 :
2381 0 : set_bit(i, cnf->state);
2382 :
2383 0 : if (cnf == net->ipv4.devconf_dflt)
2384 0 : devinet_copy_dflt_conf(net, i);
2385 0 : if (i == IPV4_DEVCONF_ACCEPT_LOCAL - 1 ||
2386 0 : i == IPV4_DEVCONF_ROUTE_LOCALNET - 1)
2387 0 : if ((new_value == 0) && (old_value != 0))
2388 0 : rt_cache_flush(net);
2389 :
2390 0 : if (i == IPV4_DEVCONF_BC_FORWARDING - 1 &&
2391 0 : new_value != old_value)
2392 0 : rt_cache_flush(net);
2393 :
2394 0 : if (i == IPV4_DEVCONF_RP_FILTER - 1 &&
2395 : new_value != old_value) {
2396 0 : ifindex = devinet_conf_ifindex(net, cnf);
2397 0 : inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
2398 : NETCONFA_RP_FILTER,
2399 : ifindex, cnf);
2400 : }
2401 0 : if (i == IPV4_DEVCONF_PROXY_ARP - 1 &&
2402 : new_value != old_value) {
2403 0 : ifindex = devinet_conf_ifindex(net, cnf);
2404 0 : inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
2405 : NETCONFA_PROXY_NEIGH,
2406 : ifindex, cnf);
2407 : }
2408 0 : if (i == IPV4_DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN - 1 &&
2409 : new_value != old_value) {
2410 0 : ifindex = devinet_conf_ifindex(net, cnf);
2411 0 : inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
2412 : NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
2413 : ifindex, cnf);
2414 : }
2415 : }
2416 :
2417 0 : return ret;
2418 : }
2419 :
2420 0 : static int devinet_sysctl_forward(struct ctl_table *ctl, int write,
2421 : void *buffer, size_t *lenp, loff_t *ppos)
2422 : {
2423 0 : int *valp = ctl->data;
2424 0 : int val = *valp;
2425 0 : loff_t pos = *ppos;
2426 0 : int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
2427 :
2428 0 : if (write && *valp != val) {
2429 0 : struct net *net = ctl->extra2;
2430 :
2431 0 : if (valp != &IPV4_DEVCONF_DFLT(net, FORWARDING)) {
2432 0 : if (!rtnl_trylock()) {
2433 : /* Restore the original values before restarting */
2434 0 : *valp = val;
2435 0 : *ppos = pos;
2436 0 : return restart_syscall();
2437 : }
2438 0 : if (valp == &IPV4_DEVCONF_ALL(net, FORWARDING)) {
2439 0 : inet_forward_change(net);
2440 : } else {
2441 0 : struct ipv4_devconf *cnf = ctl->extra1;
2442 0 : struct in_device *idev =
2443 0 : container_of(cnf, struct in_device, cnf);
2444 0 : if (*valp)
2445 0 : dev_disable_lro(idev->dev);
2446 0 : inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
2447 : NETCONFA_FORWARDING,
2448 0 : idev->dev->ifindex,
2449 : cnf);
2450 : }
2451 0 : rtnl_unlock();
2452 0 : rt_cache_flush(net);
2453 : } else
2454 0 : inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
2455 : NETCONFA_FORWARDING,
2456 : NETCONFA_IFINDEX_DEFAULT,
2457 : net->ipv4.devconf_dflt);
2458 : }
2459 :
2460 : return ret;
2461 : }
2462 :
2463 0 : static int ipv4_doint_and_flush(struct ctl_table *ctl, int write,
2464 : void *buffer, size_t *lenp, loff_t *ppos)
2465 : {
2466 0 : int *valp = ctl->data;
2467 0 : int val = *valp;
2468 0 : int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
2469 0 : struct net *net = ctl->extra2;
2470 :
2471 0 : if (write && *valp != val)
2472 0 : rt_cache_flush(net);
2473 :
2474 0 : return ret;
2475 : }
2476 :
2477 : #define DEVINET_SYSCTL_ENTRY(attr, name, mval, proc) \
2478 : { \
2479 : .procname = name, \
2480 : .data = ipv4_devconf.data + \
2481 : IPV4_DEVCONF_ ## attr - 1, \
2482 : .maxlen = sizeof(int), \
2483 : .mode = mval, \
2484 : .proc_handler = proc, \
2485 : .extra1 = &ipv4_devconf, \
2486 : }
2487 :
2488 : #define DEVINET_SYSCTL_RW_ENTRY(attr, name) \
2489 : DEVINET_SYSCTL_ENTRY(attr, name, 0644, devinet_conf_proc)
2490 :
2491 : #define DEVINET_SYSCTL_RO_ENTRY(attr, name) \
2492 : DEVINET_SYSCTL_ENTRY(attr, name, 0444, devinet_conf_proc)
2493 :
2494 : #define DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, proc) \
2495 : DEVINET_SYSCTL_ENTRY(attr, name, 0644, proc)
2496 :
2497 : #define DEVINET_SYSCTL_FLUSHING_ENTRY(attr, name) \
2498 : DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, ipv4_doint_and_flush)
2499 :
2500 : static struct devinet_sysctl_table {
2501 : struct ctl_table_header *sysctl_header;
2502 : struct ctl_table devinet_vars[__IPV4_DEVCONF_MAX];
2503 : } devinet_sysctl = {
2504 : .devinet_vars = {
2505 : DEVINET_SYSCTL_COMPLEX_ENTRY(FORWARDING, "forwarding",
2506 : devinet_sysctl_forward),
2507 : DEVINET_SYSCTL_RO_ENTRY(MC_FORWARDING, "mc_forwarding"),
2508 : DEVINET_SYSCTL_RW_ENTRY(BC_FORWARDING, "bc_forwarding"),
2509 :
2510 : DEVINET_SYSCTL_RW_ENTRY(ACCEPT_REDIRECTS, "accept_redirects"),
2511 : DEVINET_SYSCTL_RW_ENTRY(SECURE_REDIRECTS, "secure_redirects"),
2512 : DEVINET_SYSCTL_RW_ENTRY(SHARED_MEDIA, "shared_media"),
2513 : DEVINET_SYSCTL_RW_ENTRY(RP_FILTER, "rp_filter"),
2514 : DEVINET_SYSCTL_RW_ENTRY(SEND_REDIRECTS, "send_redirects"),
2515 : DEVINET_SYSCTL_RW_ENTRY(ACCEPT_SOURCE_ROUTE,
2516 : "accept_source_route"),
2517 : DEVINET_SYSCTL_RW_ENTRY(ACCEPT_LOCAL, "accept_local"),
2518 : DEVINET_SYSCTL_RW_ENTRY(SRC_VMARK, "src_valid_mark"),
2519 : DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP, "proxy_arp"),
2520 : DEVINET_SYSCTL_RW_ENTRY(MEDIUM_ID, "medium_id"),
2521 : DEVINET_SYSCTL_RW_ENTRY(BOOTP_RELAY, "bootp_relay"),
2522 : DEVINET_SYSCTL_RW_ENTRY(LOG_MARTIANS, "log_martians"),
2523 : DEVINET_SYSCTL_RW_ENTRY(TAG, "tag"),
2524 : DEVINET_SYSCTL_RW_ENTRY(ARPFILTER, "arp_filter"),
2525 : DEVINET_SYSCTL_RW_ENTRY(ARP_ANNOUNCE, "arp_announce"),
2526 : DEVINET_SYSCTL_RW_ENTRY(ARP_IGNORE, "arp_ignore"),
2527 : DEVINET_SYSCTL_RW_ENTRY(ARP_ACCEPT, "arp_accept"),
2528 : DEVINET_SYSCTL_RW_ENTRY(ARP_NOTIFY, "arp_notify"),
2529 : DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP_PVLAN, "proxy_arp_pvlan"),
2530 : DEVINET_SYSCTL_RW_ENTRY(FORCE_IGMP_VERSION,
2531 : "force_igmp_version"),
2532 : DEVINET_SYSCTL_RW_ENTRY(IGMPV2_UNSOLICITED_REPORT_INTERVAL,
2533 : "igmpv2_unsolicited_report_interval"),
2534 : DEVINET_SYSCTL_RW_ENTRY(IGMPV3_UNSOLICITED_REPORT_INTERVAL,
2535 : "igmpv3_unsolicited_report_interval"),
2536 : DEVINET_SYSCTL_RW_ENTRY(IGNORE_ROUTES_WITH_LINKDOWN,
2537 : "ignore_routes_with_linkdown"),
2538 : DEVINET_SYSCTL_RW_ENTRY(DROP_GRATUITOUS_ARP,
2539 : "drop_gratuitous_arp"),
2540 :
2541 : DEVINET_SYSCTL_FLUSHING_ENTRY(NOXFRM, "disable_xfrm"),
2542 : DEVINET_SYSCTL_FLUSHING_ENTRY(NOPOLICY, "disable_policy"),
2543 : DEVINET_SYSCTL_FLUSHING_ENTRY(PROMOTE_SECONDARIES,
2544 : "promote_secondaries"),
2545 : DEVINET_SYSCTL_FLUSHING_ENTRY(ROUTE_LOCALNET,
2546 : "route_localnet"),
2547 : DEVINET_SYSCTL_FLUSHING_ENTRY(DROP_UNICAST_IN_L2_MULTICAST,
2548 : "drop_unicast_in_l2_multicast"),
2549 : },
2550 : };
2551 :
2552 4 : static int __devinet_sysctl_register(struct net *net, char *dev_name,
2553 : int ifindex, struct ipv4_devconf *p)
2554 : {
2555 4 : int i;
2556 4 : struct devinet_sysctl_table *t;
2557 4 : char path[sizeof("net/ipv4/conf/") + IFNAMSIZ];
2558 :
2559 4 : t = kmemdup(&devinet_sysctl, sizeof(*t), GFP_KERNEL);
2560 4 : if (!t)
2561 0 : goto out;
2562 :
2563 132 : for (i = 0; i < ARRAY_SIZE(t->devinet_vars) - 1; i++) {
2564 128 : t->devinet_vars[i].data += (char *)p - (char *)&ipv4_devconf;
2565 128 : t->devinet_vars[i].extra1 = p;
2566 128 : t->devinet_vars[i].extra2 = net;
2567 : }
2568 :
2569 4 : snprintf(path, sizeof(path), "net/ipv4/conf/%s", dev_name);
2570 :
2571 4 : t->sysctl_header = register_net_sysctl(net, path, t->devinet_vars);
2572 4 : if (!t->sysctl_header)
2573 0 : goto free;
2574 :
2575 4 : p->sysctl = t;
2576 :
2577 4 : inet_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
2578 : ifindex, p);
2579 4 : return 0;
2580 :
2581 0 : free:
2582 0 : kfree(t);
2583 : out:
2584 : return -ENOBUFS;
2585 : }
2586 :
2587 0 : static void __devinet_sysctl_unregister(struct net *net,
2588 : struct ipv4_devconf *cnf, int ifindex)
2589 : {
2590 0 : struct devinet_sysctl_table *t = cnf->sysctl;
2591 :
2592 0 : if (t) {
2593 0 : cnf->sysctl = NULL;
2594 0 : unregister_net_sysctl_table(t->sysctl_header);
2595 0 : kfree(t);
2596 : }
2597 :
2598 0 : inet_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
2599 0 : }
2600 :
2601 2 : static int devinet_sysctl_register(struct in_device *idev)
2602 : {
2603 2 : int err;
2604 :
2605 2 : if (!sysctl_dev_name_is_allowed(idev->dev->name))
2606 : return -EINVAL;
2607 :
2608 2 : err = neigh_sysctl_register(idev->dev, idev->arp_parms, NULL);
2609 2 : if (err)
2610 : return err;
2611 4 : err = __devinet_sysctl_register(dev_net(idev->dev), idev->dev->name,
2612 2 : idev->dev->ifindex, &idev->cnf);
2613 2 : if (err)
2614 0 : neigh_sysctl_unregister(idev->arp_parms);
2615 : return err;
2616 : }
2617 :
2618 0 : static void devinet_sysctl_unregister(struct in_device *idev)
2619 : {
2620 0 : struct net *net = dev_net(idev->dev);
2621 :
2622 0 : __devinet_sysctl_unregister(net, &idev->cnf, idev->dev->ifindex);
2623 0 : neigh_sysctl_unregister(idev->arp_parms);
2624 0 : }
2625 :
2626 : static struct ctl_table ctl_forward_entry[] = {
2627 : {
2628 : .procname = "ip_forward",
2629 : .data = &ipv4_devconf.data[
2630 : IPV4_DEVCONF_FORWARDING - 1],
2631 : .maxlen = sizeof(int),
2632 : .mode = 0644,
2633 : .proc_handler = devinet_sysctl_forward,
2634 : .extra1 = &ipv4_devconf,
2635 : .extra2 = &init_net,
2636 : },
2637 : { },
2638 : };
2639 : #endif
2640 :
2641 1 : static __net_init int devinet_init_net(struct net *net)
2642 : {
2643 1 : int err;
2644 1 : struct ipv4_devconf *all, *dflt;
2645 : #ifdef CONFIG_SYSCTL
2646 1 : struct ctl_table *tbl;
2647 1 : struct ctl_table_header *forw_hdr;
2648 : #endif
2649 :
2650 1 : err = -ENOMEM;
2651 1 : all = kmemdup(&ipv4_devconf, sizeof(ipv4_devconf), GFP_KERNEL);
2652 1 : if (!all)
2653 0 : goto err_alloc_all;
2654 :
2655 1 : dflt = kmemdup(&ipv4_devconf_dflt, sizeof(ipv4_devconf_dflt), GFP_KERNEL);
2656 1 : if (!dflt)
2657 0 : goto err_alloc_dflt;
2658 :
2659 : #ifdef CONFIG_SYSCTL
2660 1 : tbl = kmemdup(ctl_forward_entry, sizeof(ctl_forward_entry), GFP_KERNEL);
2661 1 : if (!tbl)
2662 0 : goto err_alloc_ctl;
2663 :
2664 1 : tbl[0].data = &all->data[IPV4_DEVCONF_FORWARDING - 1];
2665 1 : tbl[0].extra1 = all;
2666 1 : tbl[0].extra2 = net;
2667 : #endif
2668 :
2669 1 : if (!net_eq(net, &init_net)) {
2670 : if (IS_ENABLED(CONFIG_SYSCTL) &&
2671 : sysctl_devconf_inherit_init_net == 3) {
2672 : /* copy from the current netns */
2673 : memcpy(all, current->nsproxy->net_ns->ipv4.devconf_all,
2674 : sizeof(ipv4_devconf));
2675 : memcpy(dflt,
2676 : current->nsproxy->net_ns->ipv4.devconf_dflt,
2677 : sizeof(ipv4_devconf_dflt));
2678 : } else if (!IS_ENABLED(CONFIG_SYSCTL) ||
2679 : sysctl_devconf_inherit_init_net != 2) {
2680 : /* inherit == 0 or 1: copy from init_net */
2681 : memcpy(all, init_net.ipv4.devconf_all,
2682 : sizeof(ipv4_devconf));
2683 : memcpy(dflt, init_net.ipv4.devconf_dflt,
2684 : sizeof(ipv4_devconf_dflt));
2685 : }
2686 : /* else inherit == 2: use compiled values */
2687 : }
2688 :
2689 : #ifdef CONFIG_SYSCTL
2690 1 : err = __devinet_sysctl_register(net, "all", NETCONFA_IFINDEX_ALL, all);
2691 1 : if (err < 0)
2692 0 : goto err_reg_all;
2693 :
2694 1 : err = __devinet_sysctl_register(net, "default",
2695 : NETCONFA_IFINDEX_DEFAULT, dflt);
2696 1 : if (err < 0)
2697 0 : goto err_reg_dflt;
2698 :
2699 1 : err = -ENOMEM;
2700 1 : forw_hdr = register_net_sysctl(net, "net/ipv4", tbl);
2701 1 : if (!forw_hdr)
2702 0 : goto err_reg_ctl;
2703 1 : net->ipv4.forw_hdr = forw_hdr;
2704 : #endif
2705 :
2706 1 : net->ipv4.devconf_all = all;
2707 1 : net->ipv4.devconf_dflt = dflt;
2708 1 : return 0;
2709 :
2710 : #ifdef CONFIG_SYSCTL
2711 0 : err_reg_ctl:
2712 0 : __devinet_sysctl_unregister(net, dflt, NETCONFA_IFINDEX_DEFAULT);
2713 0 : err_reg_dflt:
2714 0 : __devinet_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL);
2715 0 : err_reg_all:
2716 0 : kfree(tbl);
2717 0 : err_alloc_ctl:
2718 : #endif
2719 0 : kfree(dflt);
2720 0 : err_alloc_dflt:
2721 0 : kfree(all);
2722 : err_alloc_all:
2723 : return err;
2724 : }
2725 :
2726 0 : static __net_exit void devinet_exit_net(struct net *net)
2727 : {
2728 : #ifdef CONFIG_SYSCTL
2729 0 : struct ctl_table *tbl;
2730 :
2731 0 : tbl = net->ipv4.forw_hdr->ctl_table_arg;
2732 0 : unregister_net_sysctl_table(net->ipv4.forw_hdr);
2733 0 : __devinet_sysctl_unregister(net, net->ipv4.devconf_dflt,
2734 : NETCONFA_IFINDEX_DEFAULT);
2735 0 : __devinet_sysctl_unregister(net, net->ipv4.devconf_all,
2736 : NETCONFA_IFINDEX_ALL);
2737 0 : kfree(tbl);
2738 : #endif
2739 0 : kfree(net->ipv4.devconf_dflt);
2740 0 : kfree(net->ipv4.devconf_all);
2741 0 : }
2742 :
2743 : static __net_initdata struct pernet_operations devinet_ops = {
2744 : .init = devinet_init_net,
2745 : .exit = devinet_exit_net,
2746 : };
2747 :
2748 : static struct rtnl_af_ops inet_af_ops __read_mostly = {
2749 : .family = AF_INET,
2750 : .fill_link_af = inet_fill_link_af,
2751 : .get_link_af_size = inet_get_link_af_size,
2752 : .validate_link_af = inet_validate_link_af,
2753 : .set_link_af = inet_set_link_af,
2754 : };
2755 :
2756 1 : void __init devinet_init(void)
2757 : {
2758 1 : int i;
2759 :
2760 257 : for (i = 0; i < IN4_ADDR_HSIZE; i++)
2761 256 : INIT_HLIST_HEAD(&inet_addr_lst[i]);
2762 :
2763 1 : register_pernet_subsys(&devinet_ops);
2764 :
2765 1 : register_gifconf(PF_INET, inet_gifconf);
2766 1 : register_netdevice_notifier(&ip_netdev_notifier);
2767 :
2768 1 : queue_delayed_work(system_power_efficient_wq, &check_lifetime_work, 0);
2769 :
2770 1 : rtnl_af_register(&inet_af_ops);
2771 :
2772 1 : rtnl_register(PF_INET, RTM_NEWADDR, inet_rtm_newaddr, NULL, 0);
2773 1 : rtnl_register(PF_INET, RTM_DELADDR, inet_rtm_deladdr, NULL, 0);
2774 1 : rtnl_register(PF_INET, RTM_GETADDR, NULL, inet_dump_ifaddr, 0);
2775 1 : rtnl_register(PF_INET, RTM_GETNETCONF, inet_netconf_get_devconf,
2776 : inet_netconf_dump_devconf, 0);
2777 1 : }
|
