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
inet_addr_hash(const struct net * net,__be32 addr)121 static u32 inet_addr_hash(const struct net *net, __be32 addr)
122 {
123 u32 val = (__force u32) addr ^ net_hash_mix(net);
124
125 return hash_32(val, IN4_ADDR_HSIZE_SHIFT);
126 }
127
inet_hash_insert(struct net * net,struct in_ifaddr * ifa)128 static void inet_hash_insert(struct net *net, struct in_ifaddr *ifa)
129 {
130 u32 hash = inet_addr_hash(net, ifa->ifa_local);
131
132 ASSERT_RTNL();
133 hlist_add_head_rcu(&ifa->hash, &inet_addr_lst[hash]);
134 }
135
inet_hash_remove(struct in_ifaddr * ifa)136 static void inet_hash_remove(struct in_ifaddr *ifa)
137 {
138 ASSERT_RTNL();
139 hlist_del_init_rcu(&ifa->hash);
140 }
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 */
__ip_dev_find(struct net * net,__be32 addr,bool devref)150 struct net_device *__ip_dev_find(struct net *net, __be32 addr, bool devref)
151 {
152 struct net_device *result = NULL;
153 struct in_ifaddr *ifa;
154
155 rcu_read_lock();
156 ifa = inet_lookup_ifaddr_rcu(net, addr);
157 if (!ifa) {
158 struct flowi4 fl4 = { .daddr = addr };
159 struct fib_result res = { 0 };
160 struct fib_table *local;
161
162 /* Fallback to FIB local table so that communication
163 * over loopback subnets work.
164 */
165 local = fib_get_table(net, RT_TABLE_LOCAL);
166 if (local &&
167 !fib_table_lookup(local, &fl4, &res, FIB_LOOKUP_NOREF) &&
168 res.type == RTN_LOCAL)
169 result = FIB_RES_DEV(res);
170 } else {
171 result = ifa->ifa_dev->dev;
172 }
173 if (result && devref)
174 dev_hold(result);
175 rcu_read_unlock();
176 return result;
177 }
178 EXPORT_SYMBOL(__ip_dev_find);
179
180 /* called under RCU lock */
inet_lookup_ifaddr_rcu(struct net * net,__be32 addr)181 struct in_ifaddr *inet_lookup_ifaddr_rcu(struct net *net, __be32 addr)
182 {
183 u32 hash = inet_addr_hash(net, addr);
184 struct in_ifaddr *ifa;
185
186 hlist_for_each_entry_rcu(ifa, &inet_addr_lst[hash], hash)
187 if (ifa->ifa_local == addr &&
188 net_eq(dev_net(ifa->ifa_dev->dev), net))
189 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
devinet_sysctl_register(struct in_device * idev)205 static int devinet_sysctl_register(struct in_device *idev)
206 {
207 return 0;
208 }
devinet_sysctl_unregister(struct in_device * idev)209 static void devinet_sysctl_unregister(struct in_device *idev)
210 {
211 }
212 #endif
213
214 /* Locks all the inet devices. */
215
inet_alloc_ifa(void)216 static struct in_ifaddr *inet_alloc_ifa(void)
217 {
218 return kzalloc(sizeof(struct in_ifaddr), GFP_KERNEL);
219 }
220
inet_rcu_free_ifa(struct rcu_head * head)221 static void inet_rcu_free_ifa(struct rcu_head *head)
222 {
223 struct in_ifaddr *ifa = container_of(head, struct in_ifaddr, rcu_head);
224 if (ifa->ifa_dev)
225 in_dev_put(ifa->ifa_dev);
226 kfree(ifa);
227 }
228
inet_free_ifa(struct in_ifaddr * ifa)229 static void inet_free_ifa(struct in_ifaddr *ifa)
230 {
231 call_rcu(&ifa->rcu_head, inet_rcu_free_ifa);
232 }
233
in_dev_finish_destroy(struct in_device * idev)234 void in_dev_finish_destroy(struct in_device *idev)
235 {
236 struct net_device *dev = idev->dev;
237
238 WARN_ON(idev->ifa_list);
239 WARN_ON(idev->mc_list);
240 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 dev_put(dev);
245 if (!idev->dead)
246 pr_err("Freeing alive in_device %p\n", idev);
247 else
248 kfree(idev);
249 }
250 EXPORT_SYMBOL(in_dev_finish_destroy);
251
inetdev_init(struct net_device * dev)252 static struct in_device *inetdev_init(struct net_device *dev)
253 {
254 struct in_device *in_dev;
255 int err = -ENOMEM;
256
257 ASSERT_RTNL();
258
259 in_dev = kzalloc(sizeof(*in_dev), GFP_KERNEL);
260 if (!in_dev)
261 goto out;
262 memcpy(&in_dev->cnf, dev_net(dev)->ipv4.devconf_dflt,
263 sizeof(in_dev->cnf));
264 in_dev->cnf.sysctl = NULL;
265 in_dev->dev = dev;
266 in_dev->arp_parms = neigh_parms_alloc(dev, &arp_tbl);
267 if (!in_dev->arp_parms)
268 goto out_kfree;
269 if (IPV4_DEVCONF(in_dev->cnf, FORWARDING))
270 dev_disable_lro(dev);
271 /* Reference in_dev->dev */
272 dev_hold(dev);
273 /* Account for reference dev->ip_ptr (below) */
274 refcount_set(&in_dev->refcnt, 1);
275
276 err = devinet_sysctl_register(in_dev);
277 if (err) {
278 in_dev->dead = 1;
279 neigh_parms_release(&arp_tbl, in_dev->arp_parms);
280 in_dev_put(in_dev);
281 in_dev = NULL;
282 goto out;
283 }
284 ip_mc_init_dev(in_dev);
285 if (dev->flags & IFF_UP)
286 ip_mc_up(in_dev);
287
288 /* we can receive as soon as ip_ptr is set -- do this last */
289 rcu_assign_pointer(dev->ip_ptr, in_dev);
290 out:
291 return in_dev ?: ERR_PTR(err);
292 out_kfree:
293 kfree(in_dev);
294 in_dev = NULL;
295 goto out;
296 }
297
in_dev_rcu_put(struct rcu_head * head)298 static void in_dev_rcu_put(struct rcu_head *head)
299 {
300 struct in_device *idev = container_of(head, struct in_device, rcu_head);
301 in_dev_put(idev);
302 }
303
inetdev_destroy(struct in_device * in_dev)304 static void inetdev_destroy(struct in_device *in_dev)
305 {
306 struct net_device *dev;
307 struct in_ifaddr *ifa;
308
309 ASSERT_RTNL();
310
311 dev = in_dev->dev;
312
313 in_dev->dead = 1;
314
315 ip_mc_destroy_dev(in_dev);
316
317 while ((ifa = rtnl_dereference(in_dev->ifa_list)) != NULL) {
318 inet_del_ifa(in_dev, &in_dev->ifa_list, 0);
319 inet_free_ifa(ifa);
320 }
321
322 RCU_INIT_POINTER(dev->ip_ptr, NULL);
323
324 devinet_sysctl_unregister(in_dev);
325 neigh_parms_release(&arp_tbl, in_dev->arp_parms);
326 arp_ifdown(dev);
327
328 call_rcu(&in_dev->rcu_head, in_dev_rcu_put);
329 }
330
inet_addr_onlink(struct in_device * in_dev,__be32 a,__be32 b)331 int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b)
332 {
333 const struct in_ifaddr *ifa;
334
335 rcu_read_lock();
336 in_dev_for_each_ifa_rcu(ifa, in_dev) {
337 if (inet_ifa_match(a, ifa)) {
338 if (!b || inet_ifa_match(b, ifa)) {
339 rcu_read_unlock();
340 return 1;
341 }
342 }
343 }
344 rcu_read_unlock();
345 return 0;
346 }
347
__inet_del_ifa(struct in_device * in_dev,struct in_ifaddr __rcu ** ifap,int destroy,struct nlmsghdr * nlh,u32 portid)348 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 struct in_ifaddr *promote = NULL;
353 struct in_ifaddr *ifa, *ifa1;
354 struct in_ifaddr __rcu **last_prim;
355 struct in_ifaddr *prev_prom = NULL;
356 int do_promote = IN_DEV_PROMOTE_SECONDARIES(in_dev);
357
358 ASSERT_RTNL();
359
360 ifa1 = rtnl_dereference(*ifap);
361 last_prim = ifap;
362 if (in_dev->dead)
363 goto no_promotions;
364
365 /* 1. Deleting primary ifaddr forces deletion all secondaries
366 * unless alias promotion is set
367 **/
368
369 if (!(ifa1->ifa_flags & IFA_F_SECONDARY)) {
370 struct in_ifaddr __rcu **ifap1 = &ifa1->ifa_next;
371
372 while ((ifa = rtnl_dereference(*ifap1)) != NULL) {
373 if (!(ifa->ifa_flags & IFA_F_SECONDARY) &&
374 ifa1->ifa_scope <= ifa->ifa_scope)
375 last_prim = &ifa->ifa_next;
376
377 if (!(ifa->ifa_flags & IFA_F_SECONDARY) ||
378 ifa1->ifa_mask != ifa->ifa_mask ||
379 !inet_ifa_match(ifa1->ifa_address, ifa)) {
380 ifap1 = &ifa->ifa_next;
381 prev_prom = ifa;
382 continue;
383 }
384
385 if (!do_promote) {
386 inet_hash_remove(ifa);
387 *ifap1 = ifa->ifa_next;
388
389 rtmsg_ifa(RTM_DELADDR, ifa, nlh, portid);
390 blocking_notifier_call_chain(&inetaddr_chain,
391 NETDEV_DOWN, ifa);
392 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 for (ifa = promote; ifa; ifa = rtnl_dereference(ifa->ifa_next)) {
406 if (ifa1->ifa_mask == ifa->ifa_mask &&
407 inet_ifa_match(ifa1->ifa_address, ifa))
408 fib_del_ifaddr(ifa, ifa1);
409 }
410
411 no_promotions:
412 /* 2. Unlink it */
413
414 *ifap = ifa1->ifa_next;
415 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 rtmsg_ifa(RTM_DELADDR, ifa1, nlh, portid);
428 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa1);
429
430 if (promote) {
431 struct in_ifaddr *next_sec;
432
433 next_sec = rtnl_dereference(promote->ifa_next);
434 if (prev_prom) {
435 struct in_ifaddr *last_sec;
436
437 rcu_assign_pointer(prev_prom->ifa_next, next_sec);
438
439 last_sec = rtnl_dereference(*last_prim);
440 rcu_assign_pointer(promote->ifa_next, last_sec);
441 rcu_assign_pointer(*last_prim, promote);
442 }
443
444 promote->ifa_flags &= ~IFA_F_SECONDARY;
445 rtmsg_ifa(RTM_NEWADDR, promote, nlh, portid);
446 blocking_notifier_call_chain(&inetaddr_chain,
447 NETDEV_UP, promote);
448 for (ifa = next_sec; ifa;
449 ifa = rtnl_dereference(ifa->ifa_next)) {
450 if (ifa1->ifa_mask != ifa->ifa_mask ||
451 !inet_ifa_match(ifa1->ifa_address, ifa))
452 continue;
453 fib_add_ifaddr(ifa);
454 }
455
456 }
457 if (destroy)
458 inet_free_ifa(ifa1);
459 }
460
inet_del_ifa(struct in_device * in_dev,struct in_ifaddr __rcu ** ifap,int destroy)461 static void inet_del_ifa(struct in_device *in_dev,
462 struct in_ifaddr __rcu **ifap,
463 int destroy)
464 {
465 __inet_del_ifa(in_dev, ifap, destroy, NULL, 0);
466 }
467
468 static void check_lifetime(struct work_struct *work);
469
470 static DECLARE_DELAYED_WORK(check_lifetime_work, check_lifetime);
471
__inet_insert_ifa(struct in_ifaddr * ifa,struct nlmsghdr * nlh,u32 portid,struct netlink_ext_ack * extack)472 static int __inet_insert_ifa(struct in_ifaddr *ifa, struct nlmsghdr *nlh,
473 u32 portid, struct netlink_ext_ack *extack)
474 {
475 struct in_ifaddr __rcu **last_primary, **ifap;
476 struct in_device *in_dev = ifa->ifa_dev;
477 struct in_validator_info ivi;
478 struct in_ifaddr *ifa1;
479 int ret;
480
481 ASSERT_RTNL();
482
483 if (!ifa->ifa_local) {
484 inet_free_ifa(ifa);
485 return 0;
486 }
487
488 ifa->ifa_flags &= ~IFA_F_SECONDARY;
489 last_primary = &in_dev->ifa_list;
490
491 /* Don't set IPv6 only flags to IPv4 addresses */
492 ifa->ifa_flags &= ~IPV6ONLY_FLAGS;
493
494 ifap = &in_dev->ifa_list;
495 ifa1 = rtnl_dereference(*ifap);
496
497 while (ifa1) {
498 if (!(ifa1->ifa_flags & IFA_F_SECONDARY) &&
499 ifa->ifa_scope <= ifa1->ifa_scope)
500 last_primary = &ifa1->ifa_next;
501 if (ifa1->ifa_mask == ifa->ifa_mask &&
502 inet_ifa_match(ifa1->ifa_address, ifa)) {
503 if (ifa1->ifa_local == ifa->ifa_local) {
504 inet_free_ifa(ifa);
505 return -EEXIST;
506 }
507 if (ifa1->ifa_scope != ifa->ifa_scope) {
508 inet_free_ifa(ifa);
509 return -EINVAL;
510 }
511 ifa->ifa_flags |= IFA_F_SECONDARY;
512 }
513
514 ifap = &ifa1->ifa_next;
515 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 ivi.ivi_addr = ifa->ifa_address;
526 ivi.ivi_dev = ifa->ifa_dev;
527 ivi.extack = extack;
528 ret = blocking_notifier_call_chain(&inetaddr_validator_chain,
529 NETDEV_UP, &ivi);
530 ret = notifier_to_errno(ret);
531 if (ret) {
532 inet_free_ifa(ifa);
533 return ret;
534 }
535
536 if (!(ifa->ifa_flags & IFA_F_SECONDARY)) {
537 prandom_seed((__force u32) ifa->ifa_local);
538 ifap = last_primary;
539 }
540
541 rcu_assign_pointer(ifa->ifa_next, *ifap);
542 rcu_assign_pointer(*ifap, ifa);
543
544 inet_hash_insert(dev_net(in_dev->dev), ifa);
545
546 cancel_delayed_work(&check_lifetime_work);
547 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 rtmsg_ifa(RTM_NEWADDR, ifa, nlh, portid);
553 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa);
554
555 return 0;
556 }
557
inet_insert_ifa(struct in_ifaddr * ifa)558 static int inet_insert_ifa(struct in_ifaddr *ifa)
559 {
560 return __inet_insert_ifa(ifa, NULL, 0, NULL);
561 }
562
inet_set_ifa(struct net_device * dev,struct in_ifaddr * ifa)563 static int inet_set_ifa(struct net_device *dev, struct in_ifaddr *ifa)
564 {
565 struct in_device *in_dev = __in_dev_get_rtnl(dev);
566
567 ASSERT_RTNL();
568
569 if (!in_dev) {
570 inet_free_ifa(ifa);
571 return -ENOBUFS;
572 }
573 ipv4_devconf_setall(in_dev);
574 neigh_parms_data_state_setall(in_dev->arp_parms);
575 if (ifa->ifa_dev != in_dev) {
576 WARN_ON(ifa->ifa_dev);
577 in_dev_hold(in_dev);
578 ifa->ifa_dev = in_dev;
579 }
580 if (ipv4_is_loopback(ifa->ifa_local))
581 ifa->ifa_scope = RT_SCOPE_HOST;
582 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 */
inetdev_by_index(struct net * net,int ifindex)588 struct in_device *inetdev_by_index(struct net *net, int ifindex)
589 {
590 struct net_device *dev;
591 struct in_device *in_dev = NULL;
592
593 rcu_read_lock();
594 dev = dev_get_by_index_rcu(net, ifindex);
595 if (dev)
596 in_dev = rcu_dereference_rtnl(dev->ip_ptr);
597 rcu_read_unlock();
598 return in_dev;
599 }
600 EXPORT_SYMBOL(inetdev_by_index);
601
602 /* Called only from RTNL semaphored context. No locks. */
603
inet_ifa_byprefix(struct in_device * in_dev,__be32 prefix,__be32 mask)604 struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix,
605 __be32 mask)
606 {
607 struct in_ifaddr *ifa;
608
609 ASSERT_RTNL();
610
611 in_dev_for_each_ifa_rtnl(ifa, in_dev) {
612 if (ifa->ifa_mask == mask && inet_ifa_match(prefix, ifa))
613 return ifa;
614 }
615 return NULL;
616 }
617
ip_mc_autojoin_config(struct net * net,bool join,const struct in_ifaddr * ifa)618 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 return -EOPNOTSUPP;
641 #endif
642 }
643
inet_rtm_deladdr(struct sk_buff * skb,struct nlmsghdr * nlh,struct netlink_ext_ack * extack)644 static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
645 struct netlink_ext_ack *extack)
646 {
647 struct net *net = sock_net(skb->sk);
648 struct in_ifaddr __rcu **ifap;
649 struct nlattr *tb[IFA_MAX+1];
650 struct in_device *in_dev;
651 struct ifaddrmsg *ifm;
652 struct in_ifaddr *ifa;
653
654 int err = -EINVAL;
655
656 ASSERT_RTNL();
657
658 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
659 ifa_ipv4_policy, extack);
660 if (err < 0)
661 goto errout;
662
663 ifm = nlmsg_data(nlh);
664 in_dev = inetdev_by_index(net, ifm->ifa_index);
665 if (!in_dev) {
666 err = -ENODEV;
667 goto errout;
668 }
669
670 for (ifap = &in_dev->ifa_list; (ifa = rtnl_dereference(*ifap)) != NULL;
671 ifap = &ifa->ifa_next) {
672 if (tb[IFA_LOCAL] &&
673 ifa->ifa_local != nla_get_in_addr(tb[IFA_LOCAL]))
674 continue;
675
676 if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label))
677 continue;
678
679 if (tb[IFA_ADDRESS] &&
680 (ifm->ifa_prefixlen != ifa->ifa_prefixlen ||
681 !inet_ifa_match(nla_get_in_addr(tb[IFA_ADDRESS]), ifa)))
682 continue;
683
684 if (ipv4_is_multicast(ifa->ifa_address))
685 ip_mc_autojoin_config(net, false, ifa);
686 __inet_del_ifa(in_dev, ifap, 1, nlh, NETLINK_CB(skb).portid);
687 return 0;
688 }
689
690 err = -EADDRNOTAVAIL;
691 errout:
692 return err;
693 }
694
695 #define INFINITY_LIFE_TIME 0xFFFFFFFF
696
check_lifetime(struct work_struct * work)697 static void check_lifetime(struct work_struct *work)
698 {
699 unsigned long now, next, next_sec, next_sched;
700 struct in_ifaddr *ifa;
701 struct hlist_node *n;
702 int i;
703
704 now = jiffies;
705 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
706
707 for (i = 0; i < IN4_ADDR_HSIZE; i++) {
708 bool change_needed = false;
709
710 rcu_read_lock();
711 hlist_for_each_entry_rcu(ifa, &inet_addr_lst[i], hash) {
712 unsigned long age;
713
714 if (ifa->ifa_flags & IFA_F_PERMANENT)
715 continue;
716
717 /* We try to batch several events at once. */
718 age = (now - ifa->ifa_tstamp +
719 ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
720
721 if (ifa->ifa_valid_lft != INFINITY_LIFE_TIME &&
722 age >= ifa->ifa_valid_lft) {
723 change_needed = true;
724 } else if (ifa->ifa_preferred_lft ==
725 INFINITY_LIFE_TIME) {
726 continue;
727 } else if (age >= ifa->ifa_preferred_lft) {
728 if (time_before(ifa->ifa_tstamp +
729 ifa->ifa_valid_lft * HZ, next))
730 next = ifa->ifa_tstamp +
731 ifa->ifa_valid_lft * HZ;
732
733 if (!(ifa->ifa_flags & IFA_F_DEPRECATED))
734 change_needed = true;
735 } else if (time_before(ifa->ifa_tstamp +
736 ifa->ifa_preferred_lft * HZ,
737 next)) {
738 next = ifa->ifa_tstamp +
739 ifa->ifa_preferred_lft * HZ;
740 }
741 }
742 rcu_read_unlock();
743 if (!change_needed)
744 continue;
745 rtnl_lock();
746 hlist_for_each_entry_safe(ifa, n, &inet_addr_lst[i], hash) {
747 unsigned long age;
748
749 if (ifa->ifa_flags & IFA_F_PERMANENT)
750 continue;
751
752 /* We try to batch several events at once. */
753 age = (now - ifa->ifa_tstamp +
754 ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
755
756 if (ifa->ifa_valid_lft != INFINITY_LIFE_TIME &&
757 age >= ifa->ifa_valid_lft) {
758 struct in_ifaddr __rcu **ifap;
759 struct in_ifaddr *tmp;
760
761 ifap = &ifa->ifa_dev->ifa_list;
762 tmp = rtnl_dereference(*ifap);
763 while (tmp) {
764 if (tmp == ifa) {
765 inet_del_ifa(ifa->ifa_dev,
766 ifap, 1);
767 break;
768 }
769 ifap = &tmp->ifa_next;
770 tmp = rtnl_dereference(*ifap);
771 }
772 } else if (ifa->ifa_preferred_lft !=
773 INFINITY_LIFE_TIME &&
774 age >= ifa->ifa_preferred_lft &&
775 !(ifa->ifa_flags & IFA_F_DEPRECATED)) {
776 ifa->ifa_flags |= IFA_F_DEPRECATED;
777 rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0);
778 }
779 }
780 rtnl_unlock();
781 }
782
783 next_sec = round_jiffies_up(next);
784 next_sched = next;
785
786 /* If rounded timeout is accurate enough, accept it. */
787 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
788 next_sched = next_sec;
789
790 now = jiffies;
791 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
792 if (time_before(next_sched, now + ADDRCONF_TIMER_FUZZ_MAX))
793 next_sched = now + ADDRCONF_TIMER_FUZZ_MAX;
794
795 queue_delayed_work(system_power_efficient_wq, &check_lifetime_work,
796 next_sched - now);
797 }
798
set_ifa_lifetime(struct in_ifaddr * ifa,__u32 valid_lft,__u32 prefered_lft)799 static void set_ifa_lifetime(struct in_ifaddr *ifa, __u32 valid_lft,
800 __u32 prefered_lft)
801 {
802 unsigned long timeout;
803
804 ifa->ifa_flags &= ~(IFA_F_PERMANENT | IFA_F_DEPRECATED);
805
806 timeout = addrconf_timeout_fixup(valid_lft, HZ);
807 if (addrconf_finite_timeout(timeout))
808 ifa->ifa_valid_lft = timeout;
809 else
810 ifa->ifa_flags |= IFA_F_PERMANENT;
811
812 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
813 if (addrconf_finite_timeout(timeout)) {
814 if (timeout == 0)
815 ifa->ifa_flags |= IFA_F_DEPRECATED;
816 ifa->ifa_preferred_lft = timeout;
817 }
818 ifa->ifa_tstamp = jiffies;
819 if (!ifa->ifa_cstamp)
820 ifa->ifa_cstamp = ifa->ifa_tstamp;
821 }
822
rtm_to_ifaddr(struct net * net,struct nlmsghdr * nlh,__u32 * pvalid_lft,__u32 * pprefered_lft,struct netlink_ext_ack * extack)823 static struct in_ifaddr *rtm_to_ifaddr(struct net *net, struct nlmsghdr *nlh,
824 __u32 *pvalid_lft, __u32 *pprefered_lft,
825 struct netlink_ext_ack *extack)
826 {
827 struct nlattr *tb[IFA_MAX+1];
828 struct in_ifaddr *ifa;
829 struct ifaddrmsg *ifm;
830 struct net_device *dev;
831 struct in_device *in_dev;
832 int err;
833
834 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
835 ifa_ipv4_policy, extack);
836 if (err < 0)
837 goto errout;
838
839 ifm = nlmsg_data(nlh);
840 err = -EINVAL;
841 if (ifm->ifa_prefixlen > 32 || !tb[IFA_LOCAL])
842 goto errout;
843
844 dev = __dev_get_by_index(net, ifm->ifa_index);
845 err = -ENODEV;
846 if (!dev)
847 goto errout;
848
849 in_dev = __in_dev_get_rtnl(dev);
850 err = -ENOBUFS;
851 if (!in_dev)
852 goto errout;
853
854 ifa = inet_alloc_ifa();
855 if (!ifa)
856 /*
857 * A potential indev allocation can be left alive, it stays
858 * assigned to its device and is destroy with it.
859 */
860 goto errout;
861
862 ipv4_devconf_setall(in_dev);
863 neigh_parms_data_state_setall(in_dev->arp_parms);
864 in_dev_hold(in_dev);
865
866 if (!tb[IFA_ADDRESS])
867 tb[IFA_ADDRESS] = tb[IFA_LOCAL];
868
869 INIT_HLIST_NODE(&ifa->hash);
870 ifa->ifa_prefixlen = ifm->ifa_prefixlen;
871 ifa->ifa_mask = inet_make_mask(ifm->ifa_prefixlen);
872 ifa->ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) :
873 ifm->ifa_flags;
874 ifa->ifa_scope = ifm->ifa_scope;
875 ifa->ifa_dev = in_dev;
876
877 ifa->ifa_local = nla_get_in_addr(tb[IFA_LOCAL]);
878 ifa->ifa_address = nla_get_in_addr(tb[IFA_ADDRESS]);
879
880 if (tb[IFA_BROADCAST])
881 ifa->ifa_broadcast = nla_get_in_addr(tb[IFA_BROADCAST]);
882
883 if (tb[IFA_LABEL])
884 nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ);
885 else
886 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
887
888 if (tb[IFA_RT_PRIORITY])
889 ifa->ifa_rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]);
890
891 if (tb[IFA_CACHEINFO]) {
892 struct ifa_cacheinfo *ci;
893
894 ci = nla_data(tb[IFA_CACHEINFO]);
895 if (!ci->ifa_valid || ci->ifa_prefered > ci->ifa_valid) {
896 err = -EINVAL;
897 goto errout_free;
898 }
899 *pvalid_lft = ci->ifa_valid;
900 *pprefered_lft = ci->ifa_prefered;
901 }
902
903 return ifa;
904
905 errout_free:
906 inet_free_ifa(ifa);
907 errout:
908 return ERR_PTR(err);
909 }
910
find_matching_ifa(struct in_ifaddr * ifa)911 static struct in_ifaddr *find_matching_ifa(struct in_ifaddr *ifa)
912 {
913 struct in_device *in_dev = ifa->ifa_dev;
914 struct in_ifaddr *ifa1;
915
916 if (!ifa->ifa_local)
917 return NULL;
918
919 in_dev_for_each_ifa_rtnl(ifa1, in_dev) {
920 if (ifa1->ifa_mask == ifa->ifa_mask &&
921 inet_ifa_match(ifa1->ifa_address, ifa) &&
922 ifa1->ifa_local == ifa->ifa_local)
923 return ifa1;
924 }
925 return NULL;
926 }
927
inet_rtm_newaddr(struct sk_buff * skb,struct nlmsghdr * nlh,struct netlink_ext_ack * extack)928 static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
929 struct netlink_ext_ack *extack)
930 {
931 struct net *net = sock_net(skb->sk);
932 struct in_ifaddr *ifa;
933 struct in_ifaddr *ifa_existing;
934 __u32 valid_lft = INFINITY_LIFE_TIME;
935 __u32 prefered_lft = INFINITY_LIFE_TIME;
936
937 ASSERT_RTNL();
938
939 ifa = rtm_to_ifaddr(net, nlh, &valid_lft, &prefered_lft, extack);
940 if (IS_ERR(ifa))
941 return PTR_ERR(ifa);
942
943 ifa_existing = find_matching_ifa(ifa);
944 if (!ifa_existing) {
945 /* It would be best to check for !NLM_F_CREATE here but
946 * userspace already relies on not having to provide this.
947 */
948 set_ifa_lifetime(ifa, valid_lft, prefered_lft);
949 if (ifa->ifa_flags & IFA_F_MCAUTOJOIN) {
950 int ret = ip_mc_autojoin_config(net, true, ifa);
951
952 if (ret < 0) {
953 inet_free_ifa(ifa);
954 return ret;
955 }
956 }
957 return __inet_insert_ifa(ifa, nlh, NETLINK_CB(skb).portid,
958 extack);
959 } else {
960 u32 new_metric = ifa->ifa_rt_priority;
961
962 inet_free_ifa(ifa);
963
964 if (nlh->nlmsg_flags & NLM_F_EXCL ||
965 !(nlh->nlmsg_flags & NLM_F_REPLACE))
966 return -EEXIST;
967 ifa = ifa_existing;
968
969 if (ifa->ifa_rt_priority != new_metric) {
970 fib_modify_prefix_metric(ifa, new_metric);
971 ifa->ifa_rt_priority = new_metric;
972 }
973
974 set_ifa_lifetime(ifa, valid_lft, prefered_lft);
975 cancel_delayed_work(&check_lifetime_work);
976 queue_delayed_work(system_power_efficient_wq,
977 &check_lifetime_work, 0);
978 rtmsg_ifa(RTM_NEWADDR, ifa, nlh, NETLINK_CB(skb).portid);
979 }
980 return 0;
981 }
982
983 /*
984 * Determine a default network mask, based on the IP address.
985 */
986
inet_abc_len(__be32 addr)987 static int inet_abc_len(__be32 addr)
988 {
989 int rc = -1; /* Something else, probably a multicast. */
990
991 if (ipv4_is_zeronet(addr) || ipv4_is_lbcast(addr))
992 rc = 0;
993 else {
994 __u32 haddr = ntohl(addr);
995 if (IN_CLASSA(haddr))
996 rc = 8;
997 else if (IN_CLASSB(haddr))
998 rc = 16;
999 else if (IN_CLASSC(haddr))
1000 rc = 24;
1001 else if (IN_CLASSE(haddr))
1002 rc = 32;
1003 }
1004
1005 return rc;
1006 }
1007
1008
devinet_ioctl(struct net * net,unsigned int cmd,struct ifreq * ifr)1009 int devinet_ioctl(struct net *net, unsigned int cmd, struct ifreq *ifr)
1010 {
1011 struct sockaddr_in sin_orig;
1012 struct sockaddr_in *sin = (struct sockaddr_in *)&ifr->ifr_addr;
1013 struct in_ifaddr __rcu **ifap = NULL;
1014 struct in_device *in_dev;
1015 struct in_ifaddr *ifa = NULL;
1016 struct net_device *dev;
1017 char *colon;
1018 int ret = -EFAULT;
1019 int tryaddrmatch = 0;
1020
1021 ifr->ifr_name[IFNAMSIZ - 1] = 0;
1022
1023 /* save original address for comparison */
1024 memcpy(&sin_orig, sin, sizeof(*sin));
1025
1026 colon = strchr(ifr->ifr_name, ':');
1027 if (colon)
1028 *colon = 0;
1029
1030 dev_load(net, ifr->ifr_name);
1031
1032 switch (cmd) {
1033 case SIOCGIFADDR: /* Get interface address */
1034 case SIOCGIFBRDADDR: /* Get the broadcast address */
1035 case SIOCGIFDSTADDR: /* Get the destination address */
1036 case SIOCGIFNETMASK: /* Get the netmask for the interface */
1037 /* Note that these ioctls will not sleep,
1038 so that we do not impose a lock.
1039 One day we will be forced to put shlock here (I mean SMP)
1040 */
1041 tryaddrmatch = (sin_orig.sin_family == AF_INET);
1042 memset(sin, 0, sizeof(*sin));
1043 sin->sin_family = AF_INET;
1044 break;
1045
1046 case SIOCSIFFLAGS:
1047 ret = -EPERM;
1048 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1049 goto out;
1050 break;
1051 case SIOCSIFADDR: /* Set interface address (and family) */
1052 case SIOCSIFBRDADDR: /* Set the broadcast address */
1053 case SIOCSIFDSTADDR: /* Set the destination address */
1054 case SIOCSIFNETMASK: /* Set the netmask for the interface */
1055 ret = -EPERM;
1056 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1057 goto out;
1058 ret = -EINVAL;
1059 if (sin->sin_family != AF_INET)
1060 goto out;
1061 break;
1062 default:
1063 ret = -EINVAL;
1064 goto out;
1065 }
1066
1067 rtnl_lock();
1068
1069 ret = -ENODEV;
1070 dev = __dev_get_by_name(net, ifr->ifr_name);
1071 if (!dev)
1072 goto done;
1073
1074 if (colon)
1075 *colon = ':';
1076
1077 in_dev = __in_dev_get_rtnl(dev);
1078 if (in_dev) {
1079 if (tryaddrmatch) {
1080 /* Matthias Andree */
1081 /* compare label and address (4.4BSD style) */
1082 /* note: we only do this for a limited set of ioctls
1083 and only if the original address family was AF_INET.
1084 This is checked above. */
1085
1086 for (ifap = &in_dev->ifa_list;
1087 (ifa = rtnl_dereference(*ifap)) != NULL;
1088 ifap = &ifa->ifa_next) {
1089 if (!strcmp(ifr->ifr_name, ifa->ifa_label) &&
1090 sin_orig.sin_addr.s_addr ==
1091 ifa->ifa_local) {
1092 break; /* found */
1093 }
1094 }
1095 }
1096 /* we didn't get a match, maybe the application is
1097 4.3BSD-style and passed in junk so we fall back to
1098 comparing just the label */
1099 if (!ifa) {
1100 for (ifap = &in_dev->ifa_list;
1101 (ifa = rtnl_dereference(*ifap)) != NULL;
1102 ifap = &ifa->ifa_next)
1103 if (!strcmp(ifr->ifr_name, ifa->ifa_label))
1104 break;
1105 }
1106 }
1107
1108 ret = -EADDRNOTAVAIL;
1109 if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS)
1110 goto done;
1111
1112 switch (cmd) {
1113 case SIOCGIFADDR: /* Get interface address */
1114 ret = 0;
1115 sin->sin_addr.s_addr = ifa->ifa_local;
1116 break;
1117
1118 case SIOCGIFBRDADDR: /* Get the broadcast address */
1119 ret = 0;
1120 sin->sin_addr.s_addr = ifa->ifa_broadcast;
1121 break;
1122
1123 case SIOCGIFDSTADDR: /* Get the destination address */
1124 ret = 0;
1125 sin->sin_addr.s_addr = ifa->ifa_address;
1126 break;
1127
1128 case SIOCGIFNETMASK: /* Get the netmask for the interface */
1129 ret = 0;
1130 sin->sin_addr.s_addr = ifa->ifa_mask;
1131 break;
1132
1133 case SIOCSIFFLAGS:
1134 if (colon) {
1135 ret = -EADDRNOTAVAIL;
1136 if (!ifa)
1137 break;
1138 ret = 0;
1139 if (!(ifr->ifr_flags & IFF_UP))
1140 inet_del_ifa(in_dev, ifap, 1);
1141 break;
1142 }
1143 ret = dev_change_flags(dev, ifr->ifr_flags, NULL);
1144 break;
1145
1146 case SIOCSIFADDR: /* Set interface address (and family) */
1147 ret = -EINVAL;
1148 if (inet_abc_len(sin->sin_addr.s_addr) < 0)
1149 break;
1150
1151 if (!ifa) {
1152 ret = -ENOBUFS;
1153 ifa = inet_alloc_ifa();
1154 if (!ifa)
1155 break;
1156 INIT_HLIST_NODE(&ifa->hash);
1157 if (colon)
1158 memcpy(ifa->ifa_label, ifr->ifr_name, IFNAMSIZ);
1159 else
1160 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1161 } else {
1162 ret = 0;
1163 if (ifa->ifa_local == sin->sin_addr.s_addr)
1164 break;
1165 inet_del_ifa(in_dev, ifap, 0);
1166 ifa->ifa_broadcast = 0;
1167 ifa->ifa_scope = 0;
1168 }
1169
1170 ifa->ifa_address = ifa->ifa_local = sin->sin_addr.s_addr;
1171
1172 if (!(dev->flags & IFF_POINTOPOINT)) {
1173 ifa->ifa_prefixlen = inet_abc_len(ifa->ifa_address);
1174 ifa->ifa_mask = inet_make_mask(ifa->ifa_prefixlen);
1175 if ((dev->flags & IFF_BROADCAST) &&
1176 ifa->ifa_prefixlen < 31)
1177 ifa->ifa_broadcast = ifa->ifa_address |
1178 ~ifa->ifa_mask;
1179 } else {
1180 ifa->ifa_prefixlen = 32;
1181 ifa->ifa_mask = inet_make_mask(32);
1182 }
1183 set_ifa_lifetime(ifa, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1184 ret = inet_set_ifa(dev, ifa);
1185 break;
1186
1187 case SIOCSIFBRDADDR: /* Set the broadcast address */
1188 ret = 0;
1189 if (ifa->ifa_broadcast != sin->sin_addr.s_addr) {
1190 inet_del_ifa(in_dev, ifap, 0);
1191 ifa->ifa_broadcast = sin->sin_addr.s_addr;
1192 inet_insert_ifa(ifa);
1193 }
1194 break;
1195
1196 case SIOCSIFDSTADDR: /* Set the destination address */
1197 ret = 0;
1198 if (ifa->ifa_address == sin->sin_addr.s_addr)
1199 break;
1200 ret = -EINVAL;
1201 if (inet_abc_len(sin->sin_addr.s_addr) < 0)
1202 break;
1203 ret = 0;
1204 inet_del_ifa(in_dev, ifap, 0);
1205 ifa->ifa_address = sin->sin_addr.s_addr;
1206 inet_insert_ifa(ifa);
1207 break;
1208
1209 case SIOCSIFNETMASK: /* Set the netmask for the interface */
1210
1211 /*
1212 * The mask we set must be legal.
1213 */
1214 ret = -EINVAL;
1215 if (bad_mask(sin->sin_addr.s_addr, 0))
1216 break;
1217 ret = 0;
1218 if (ifa->ifa_mask != sin->sin_addr.s_addr) {
1219 __be32 old_mask = ifa->ifa_mask;
1220 inet_del_ifa(in_dev, ifap, 0);
1221 ifa->ifa_mask = sin->sin_addr.s_addr;
1222 ifa->ifa_prefixlen = inet_mask_len(ifa->ifa_mask);
1223
1224 /* See if current broadcast address matches
1225 * with current netmask, then recalculate
1226 * the broadcast address. Otherwise it's a
1227 * funny address, so don't touch it since
1228 * the user seems to know what (s)he's doing...
1229 */
1230 if ((dev->flags & IFF_BROADCAST) &&
1231 (ifa->ifa_prefixlen < 31) &&
1232 (ifa->ifa_broadcast ==
1233 (ifa->ifa_local|~old_mask))) {
1234 ifa->ifa_broadcast = (ifa->ifa_local |
1235 ~sin->sin_addr.s_addr);
1236 }
1237 inet_insert_ifa(ifa);
1238 }
1239 break;
1240 }
1241 done:
1242 rtnl_unlock();
1243 out:
1244 return ret;
1245 }
1246
inet_gifconf(struct net_device * dev,char __user * buf,int len,int size)1247 int inet_gifconf(struct net_device *dev, char __user *buf, int len, int size)
1248 {
1249 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1250 const struct in_ifaddr *ifa;
1251 struct ifreq ifr;
1252 int done = 0;
1253
1254 if (WARN_ON(size > sizeof(struct ifreq)))
1255 goto out;
1256
1257 if (!in_dev)
1258 goto out;
1259
1260 in_dev_for_each_ifa_rtnl(ifa, in_dev) {
1261 if (!buf) {
1262 done += size;
1263 continue;
1264 }
1265 if (len < size)
1266 break;
1267 memset(&ifr, 0, sizeof(struct ifreq));
1268 strcpy(ifr.ifr_name, ifa->ifa_label);
1269
1270 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_family = AF_INET;
1271 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_addr.s_addr =
1272 ifa->ifa_local;
1273
1274 if (copy_to_user(buf + done, &ifr, size)) {
1275 done = -EFAULT;
1276 break;
1277 }
1278 len -= size;
1279 done += size;
1280 }
1281 out:
1282 return done;
1283 }
1284
in_dev_select_addr(const struct in_device * in_dev,int scope)1285 static __be32 in_dev_select_addr(const struct in_device *in_dev,
1286 int scope)
1287 {
1288 const struct in_ifaddr *ifa;
1289
1290 in_dev_for_each_ifa_rcu(ifa, in_dev) {
1291 if (ifa->ifa_flags & IFA_F_SECONDARY)
1292 continue;
1293 if (ifa->ifa_scope != RT_SCOPE_LINK &&
1294 ifa->ifa_scope <= scope)
1295 return ifa->ifa_local;
1296 }
1297
1298 return 0;
1299 }
1300
inet_select_addr(const struct net_device * dev,__be32 dst,int scope)1301 __be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope)
1302 {
1303 const struct in_ifaddr *ifa;
1304 __be32 addr = 0;
1305 unsigned char localnet_scope = RT_SCOPE_HOST;
1306 struct in_device *in_dev;
1307 struct net *net = dev_net(dev);
1308 int master_idx;
1309
1310 rcu_read_lock();
1311 in_dev = __in_dev_get_rcu(dev);
1312 if (!in_dev)
1313 goto no_in_dev;
1314
1315 if (unlikely(IN_DEV_ROUTE_LOCALNET(in_dev)))
1316 localnet_scope = RT_SCOPE_LINK;
1317
1318 in_dev_for_each_ifa_rcu(ifa, in_dev) {
1319 if (ifa->ifa_flags & IFA_F_SECONDARY)
1320 continue;
1321 if (min(ifa->ifa_scope, localnet_scope) > scope)
1322 continue;
1323 if (!dst || inet_ifa_match(dst, ifa)) {
1324 addr = ifa->ifa_local;
1325 break;
1326 }
1327 if (!addr)
1328 addr = ifa->ifa_local;
1329 }
1330
1331 if (addr)
1332 goto out_unlock;
1333 no_in_dev:
1334 master_idx = l3mdev_master_ifindex_rcu(dev);
1335
1336 /* For VRFs, the VRF device takes the place of the loopback device,
1337 * with addresses on it being preferred. Note in such cases the
1338 * loopback device will be among the devices that fail the master_idx
1339 * equality check in the loop below.
1340 */
1341 if (master_idx &&
1342 (dev = dev_get_by_index_rcu(net, master_idx)) &&
1343 (in_dev = __in_dev_get_rcu(dev))) {
1344 addr = in_dev_select_addr(in_dev, scope);
1345 if (addr)
1346 goto out_unlock;
1347 }
1348
1349 /* Not loopback addresses on loopback should be preferred
1350 in this case. It is important that lo is the first interface
1351 in dev_base list.
1352 */
1353 for_each_netdev_rcu(net, dev) {
1354 if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1355 continue;
1356
1357 in_dev = __in_dev_get_rcu(dev);
1358 if (!in_dev)
1359 continue;
1360
1361 addr = in_dev_select_addr(in_dev, scope);
1362 if (addr)
1363 goto out_unlock;
1364 }
1365 out_unlock:
1366 rcu_read_unlock();
1367 return addr;
1368 }
1369 EXPORT_SYMBOL(inet_select_addr);
1370
confirm_addr_indev(struct in_device * in_dev,__be32 dst,__be32 local,int scope)1371 static __be32 confirm_addr_indev(struct in_device *in_dev, __be32 dst,
1372 __be32 local, int scope)
1373 {
1374 unsigned char localnet_scope = RT_SCOPE_HOST;
1375 const struct in_ifaddr *ifa;
1376 __be32 addr = 0;
1377 int same = 0;
1378
1379 if (unlikely(IN_DEV_ROUTE_LOCALNET(in_dev)))
1380 localnet_scope = RT_SCOPE_LINK;
1381
1382 in_dev_for_each_ifa_rcu(ifa, in_dev) {
1383 unsigned char min_scope = min(ifa->ifa_scope, localnet_scope);
1384
1385 if (!addr &&
1386 (local == ifa->ifa_local || !local) &&
1387 min_scope <= scope) {
1388 addr = ifa->ifa_local;
1389 if (same)
1390 break;
1391 }
1392 if (!same) {
1393 same = (!local || inet_ifa_match(local, ifa)) &&
1394 (!dst || inet_ifa_match(dst, ifa));
1395 if (same && addr) {
1396 if (local || !dst)
1397 break;
1398 /* Is the selected addr into dst subnet? */
1399 if (inet_ifa_match(addr, ifa))
1400 break;
1401 /* No, then can we use new local src? */
1402 if (min_scope <= scope) {
1403 addr = ifa->ifa_local;
1404 break;
1405 }
1406 /* search for large dst subnet for addr */
1407 same = 0;
1408 }
1409 }
1410 }
1411
1412 return same ? addr : 0;
1413 }
1414
1415 /*
1416 * Confirm that local IP address exists using wildcards:
1417 * - net: netns to check, cannot be NULL
1418 * - in_dev: only on this interface, NULL=any interface
1419 * - dst: only in the same subnet as dst, 0=any dst
1420 * - local: address, 0=autoselect the local address
1421 * - scope: maximum allowed scope value for the local address
1422 */
inet_confirm_addr(struct net * net,struct in_device * in_dev,__be32 dst,__be32 local,int scope)1423 __be32 inet_confirm_addr(struct net *net, struct in_device *in_dev,
1424 __be32 dst, __be32 local, int scope)
1425 {
1426 __be32 addr = 0;
1427 struct net_device *dev;
1428
1429 if (in_dev)
1430 return confirm_addr_indev(in_dev, dst, local, scope);
1431
1432 rcu_read_lock();
1433 for_each_netdev_rcu(net, dev) {
1434 in_dev = __in_dev_get_rcu(dev);
1435 if (in_dev) {
1436 addr = confirm_addr_indev(in_dev, dst, local, scope);
1437 if (addr)
1438 break;
1439 }
1440 }
1441 rcu_read_unlock();
1442
1443 return addr;
1444 }
1445 EXPORT_SYMBOL(inet_confirm_addr);
1446
1447 /*
1448 * Device notifier
1449 */
1450
register_inetaddr_notifier(struct notifier_block * nb)1451 int register_inetaddr_notifier(struct notifier_block *nb)
1452 {
1453 return blocking_notifier_chain_register(&inetaddr_chain, nb);
1454 }
1455 EXPORT_SYMBOL(register_inetaddr_notifier);
1456
unregister_inetaddr_notifier(struct notifier_block * nb)1457 int unregister_inetaddr_notifier(struct notifier_block *nb)
1458 {
1459 return blocking_notifier_chain_unregister(&inetaddr_chain, nb);
1460 }
1461 EXPORT_SYMBOL(unregister_inetaddr_notifier);
1462
register_inetaddr_validator_notifier(struct notifier_block * nb)1463 int register_inetaddr_validator_notifier(struct notifier_block *nb)
1464 {
1465 return blocking_notifier_chain_register(&inetaddr_validator_chain, nb);
1466 }
1467 EXPORT_SYMBOL(register_inetaddr_validator_notifier);
1468
unregister_inetaddr_validator_notifier(struct notifier_block * nb)1469 int unregister_inetaddr_validator_notifier(struct notifier_block *nb)
1470 {
1471 return blocking_notifier_chain_unregister(&inetaddr_validator_chain,
1472 nb);
1473 }
1474 EXPORT_SYMBOL(unregister_inetaddr_validator_notifier);
1475
1476 /* Rename ifa_labels for a device name change. Make some effort to preserve
1477 * existing alias numbering and to create unique labels if possible.
1478 */
inetdev_changename(struct net_device * dev,struct in_device * in_dev)1479 static void inetdev_changename(struct net_device *dev, struct in_device *in_dev)
1480 {
1481 struct in_ifaddr *ifa;
1482 int named = 0;
1483
1484 in_dev_for_each_ifa_rtnl(ifa, in_dev) {
1485 char old[IFNAMSIZ], *dot;
1486
1487 memcpy(old, ifa->ifa_label, IFNAMSIZ);
1488 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1489 if (named++ == 0)
1490 goto skip;
1491 dot = strchr(old, ':');
1492 if (!dot) {
1493 sprintf(old, ":%d", named);
1494 dot = old;
1495 }
1496 if (strlen(dot) + strlen(dev->name) < IFNAMSIZ)
1497 strcat(ifa->ifa_label, dot);
1498 else
1499 strcpy(ifa->ifa_label + (IFNAMSIZ - strlen(dot) - 1), dot);
1500 skip:
1501 rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0);
1502 }
1503 }
1504
inetdev_send_gratuitous_arp(struct net_device * dev,struct in_device * in_dev)1505 static void inetdev_send_gratuitous_arp(struct net_device *dev,
1506 struct in_device *in_dev)
1507
1508 {
1509 const struct in_ifaddr *ifa;
1510
1511 in_dev_for_each_ifa_rtnl(ifa, in_dev) {
1512 arp_send(ARPOP_REQUEST, ETH_P_ARP,
1513 ifa->ifa_local, dev,
1514 ifa->ifa_local, NULL,
1515 dev->dev_addr, NULL);
1516 }
1517 }
1518
1519 /* Called only under RTNL semaphore */
1520
inetdev_event(struct notifier_block * this,unsigned long event,void * ptr)1521 static int inetdev_event(struct notifier_block *this, unsigned long event,
1522 void *ptr)
1523 {
1524 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1525 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1526
1527 ASSERT_RTNL();
1528
1529 if (!in_dev) {
1530 if (event == NETDEV_REGISTER) {
1531 in_dev = inetdev_init(dev);
1532 if (IS_ERR(in_dev))
1533 return notifier_from_errno(PTR_ERR(in_dev));
1534 if (dev->flags & IFF_LOOPBACK) {
1535 IN_DEV_CONF_SET(in_dev, NOXFRM, 1);
1536 IN_DEV_CONF_SET(in_dev, NOPOLICY, 1);
1537 }
1538 } else if (event == NETDEV_CHANGEMTU) {
1539 /* Re-enabling IP */
1540 if (inetdev_valid_mtu(dev->mtu))
1541 in_dev = inetdev_init(dev);
1542 }
1543 goto out;
1544 }
1545
1546 switch (event) {
1547 case NETDEV_REGISTER:
1548 pr_debug("%s: bug\n", __func__);
1549 RCU_INIT_POINTER(dev->ip_ptr, NULL);
1550 break;
1551 case NETDEV_UP:
1552 if (!inetdev_valid_mtu(dev->mtu))
1553 break;
1554 if (dev->flags & IFF_LOOPBACK) {
1555 struct in_ifaddr *ifa = inet_alloc_ifa();
1556
1557 if (ifa) {
1558 INIT_HLIST_NODE(&ifa->hash);
1559 ifa->ifa_local =
1560 ifa->ifa_address = htonl(INADDR_LOOPBACK);
1561 ifa->ifa_prefixlen = 8;
1562 ifa->ifa_mask = inet_make_mask(8);
1563 in_dev_hold(in_dev);
1564 ifa->ifa_dev = in_dev;
1565 ifa->ifa_scope = RT_SCOPE_HOST;
1566 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1567 set_ifa_lifetime(ifa, INFINITY_LIFE_TIME,
1568 INFINITY_LIFE_TIME);
1569 ipv4_devconf_setall(in_dev);
1570 neigh_parms_data_state_setall(in_dev->arp_parms);
1571 inet_insert_ifa(ifa);
1572 }
1573 }
1574 ip_mc_up(in_dev);
1575 fallthrough;
1576 case NETDEV_CHANGEADDR:
1577 if (!IN_DEV_ARP_NOTIFY(in_dev))
1578 break;
1579 fallthrough;
1580 case NETDEV_NOTIFY_PEERS:
1581 /* Send gratuitous ARP to notify of link change */
1582 inetdev_send_gratuitous_arp(dev, in_dev);
1583 break;
1584 case NETDEV_DOWN:
1585 ip_mc_down(in_dev);
1586 break;
1587 case NETDEV_PRE_TYPE_CHANGE:
1588 ip_mc_unmap(in_dev);
1589 break;
1590 case NETDEV_POST_TYPE_CHANGE:
1591 ip_mc_remap(in_dev);
1592 break;
1593 case NETDEV_CHANGEMTU:
1594 if (inetdev_valid_mtu(dev->mtu))
1595 break;
1596 /* disable IP when MTU is not enough */
1597 fallthrough;
1598 case NETDEV_UNREGISTER:
1599 inetdev_destroy(in_dev);
1600 break;
1601 case NETDEV_CHANGENAME:
1602 /* Do not notify about label change, this event is
1603 * not interesting to applications using netlink.
1604 */
1605 inetdev_changename(dev, in_dev);
1606
1607 devinet_sysctl_unregister(in_dev);
1608 devinet_sysctl_register(in_dev);
1609 break;
1610 }
1611 out:
1612 return NOTIFY_DONE;
1613 }
1614
1615 static struct notifier_block ip_netdev_notifier = {
1616 .notifier_call = inetdev_event,
1617 };
1618
inet_nlmsg_size(void)1619 static size_t inet_nlmsg_size(void)
1620 {
1621 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
1622 + nla_total_size(4) /* IFA_ADDRESS */
1623 + nla_total_size(4) /* IFA_LOCAL */
1624 + nla_total_size(4) /* IFA_BROADCAST */
1625 + nla_total_size(IFNAMSIZ) /* IFA_LABEL */
1626 + nla_total_size(4) /* IFA_FLAGS */
1627 + nla_total_size(4) /* IFA_RT_PRIORITY */
1628 + nla_total_size(sizeof(struct ifa_cacheinfo)); /* IFA_CACHEINFO */
1629 }
1630
cstamp_delta(unsigned long cstamp)1631 static inline u32 cstamp_delta(unsigned long cstamp)
1632 {
1633 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
1634 }
1635
put_cacheinfo(struct sk_buff * skb,unsigned long cstamp,unsigned long tstamp,u32 preferred,u32 valid)1636 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
1637 unsigned long tstamp, u32 preferred, u32 valid)
1638 {
1639 struct ifa_cacheinfo ci;
1640
1641 ci.cstamp = cstamp_delta(cstamp);
1642 ci.tstamp = cstamp_delta(tstamp);
1643 ci.ifa_prefered = preferred;
1644 ci.ifa_valid = valid;
1645
1646 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
1647 }
1648
inet_fill_ifaddr(struct sk_buff * skb,struct in_ifaddr * ifa,struct inet_fill_args * args)1649 static int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa,
1650 struct inet_fill_args *args)
1651 {
1652 struct ifaddrmsg *ifm;
1653 struct nlmsghdr *nlh;
1654 u32 preferred, valid;
1655
1656 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, sizeof(*ifm),
1657 args->flags);
1658 if (!nlh)
1659 return -EMSGSIZE;
1660
1661 ifm = nlmsg_data(nlh);
1662 ifm->ifa_family = AF_INET;
1663 ifm->ifa_prefixlen = ifa->ifa_prefixlen;
1664 ifm->ifa_flags = ifa->ifa_flags;
1665 ifm->ifa_scope = ifa->ifa_scope;
1666 ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
1667
1668 if (args->netnsid >= 0 &&
1669 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid))
1670 goto nla_put_failure;
1671
1672 if (!(ifm->ifa_flags & IFA_F_PERMANENT)) {
1673 preferred = ifa->ifa_preferred_lft;
1674 valid = ifa->ifa_valid_lft;
1675 if (preferred != INFINITY_LIFE_TIME) {
1676 long tval = (jiffies - ifa->ifa_tstamp) / HZ;
1677
1678 if (preferred > tval)
1679 preferred -= tval;
1680 else
1681 preferred = 0;
1682 if (valid != INFINITY_LIFE_TIME) {
1683 if (valid > tval)
1684 valid -= tval;
1685 else
1686 valid = 0;
1687 }
1688 }
1689 } else {
1690 preferred = INFINITY_LIFE_TIME;
1691 valid = INFINITY_LIFE_TIME;
1692 }
1693 if ((ifa->ifa_address &&
1694 nla_put_in_addr(skb, IFA_ADDRESS, ifa->ifa_address)) ||
1695 (ifa->ifa_local &&
1696 nla_put_in_addr(skb, IFA_LOCAL, ifa->ifa_local)) ||
1697 (ifa->ifa_broadcast &&
1698 nla_put_in_addr(skb, IFA_BROADCAST, ifa->ifa_broadcast)) ||
1699 (ifa->ifa_label[0] &&
1700 nla_put_string(skb, IFA_LABEL, ifa->ifa_label)) ||
1701 nla_put_u32(skb, IFA_FLAGS, ifa->ifa_flags) ||
1702 (ifa->ifa_rt_priority &&
1703 nla_put_u32(skb, IFA_RT_PRIORITY, ifa->ifa_rt_priority)) ||
1704 put_cacheinfo(skb, ifa->ifa_cstamp, ifa->ifa_tstamp,
1705 preferred, valid))
1706 goto nla_put_failure;
1707
1708 nlmsg_end(skb, nlh);
1709 return 0;
1710
1711 nla_put_failure:
1712 nlmsg_cancel(skb, nlh);
1713 return -EMSGSIZE;
1714 }
1715
inet_valid_dump_ifaddr_req(const struct nlmsghdr * nlh,struct inet_fill_args * fillargs,struct net ** tgt_net,struct sock * sk,struct netlink_callback * cb)1716 static int inet_valid_dump_ifaddr_req(const struct nlmsghdr *nlh,
1717 struct inet_fill_args *fillargs,
1718 struct net **tgt_net, struct sock *sk,
1719 struct netlink_callback *cb)
1720 {
1721 struct netlink_ext_ack *extack = cb->extack;
1722 struct nlattr *tb[IFA_MAX+1];
1723 struct ifaddrmsg *ifm;
1724 int err, i;
1725
1726 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
1727 NL_SET_ERR_MSG(extack, "ipv4: Invalid header for address dump request");
1728 return -EINVAL;
1729 }
1730
1731 ifm = nlmsg_data(nlh);
1732 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
1733 NL_SET_ERR_MSG(extack, "ipv4: Invalid values in header for address dump request");
1734 return -EINVAL;
1735 }
1736
1737 fillargs->ifindex = ifm->ifa_index;
1738 if (fillargs->ifindex) {
1739 cb->answer_flags |= NLM_F_DUMP_FILTERED;
1740 fillargs->flags |= NLM_F_DUMP_FILTERED;
1741 }
1742
1743 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
1744 ifa_ipv4_policy, extack);
1745 if (err < 0)
1746 return err;
1747
1748 for (i = 0; i <= IFA_MAX; ++i) {
1749 if (!tb[i])
1750 continue;
1751
1752 if (i == IFA_TARGET_NETNSID) {
1753 struct net *net;
1754
1755 fillargs->netnsid = nla_get_s32(tb[i]);
1756
1757 net = rtnl_get_net_ns_capable(sk, fillargs->netnsid);
1758 if (IS_ERR(net)) {
1759 fillargs->netnsid = -1;
1760 NL_SET_ERR_MSG(extack, "ipv4: Invalid target network namespace id");
1761 return PTR_ERR(net);
1762 }
1763 *tgt_net = net;
1764 } else {
1765 NL_SET_ERR_MSG(extack, "ipv4: Unsupported attribute in dump request");
1766 return -EINVAL;
1767 }
1768 }
1769
1770 return 0;
1771 }
1772
in_dev_dump_addr(struct in_device * in_dev,struct sk_buff * skb,struct netlink_callback * cb,int s_ip_idx,struct inet_fill_args * fillargs)1773 static int in_dev_dump_addr(struct in_device *in_dev, struct sk_buff *skb,
1774 struct netlink_callback *cb, int s_ip_idx,
1775 struct inet_fill_args *fillargs)
1776 {
1777 struct in_ifaddr *ifa;
1778 int ip_idx = 0;
1779 int err;
1780
1781 in_dev_for_each_ifa_rtnl(ifa, in_dev) {
1782 if (ip_idx < s_ip_idx) {
1783 ip_idx++;
1784 continue;
1785 }
1786 err = inet_fill_ifaddr(skb, ifa, fillargs);
1787 if (err < 0)
1788 goto done;
1789
1790 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1791 ip_idx++;
1792 }
1793 err = 0;
1794
1795 done:
1796 cb->args[2] = ip_idx;
1797
1798 return err;
1799 }
1800
1801 /* Combine dev_addr_genid and dev_base_seq to detect changes.
1802 */
inet_base_seq(const struct net * net)1803 static u32 inet_base_seq(const struct net *net)
1804 {
1805 u32 res = atomic_read(&net->ipv4.dev_addr_genid) +
1806 net->dev_base_seq;
1807
1808 /* Must not return 0 (see nl_dump_check_consistent()).
1809 * Chose a value far away from 0.
1810 */
1811 if (!res)
1812 res = 0x80000000;
1813 return res;
1814 }
1815
inet_dump_ifaddr(struct sk_buff * skb,struct netlink_callback * cb)1816 static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
1817 {
1818 const struct nlmsghdr *nlh = cb->nlh;
1819 struct inet_fill_args fillargs = {
1820 .portid = NETLINK_CB(cb->skb).portid,
1821 .seq = nlh->nlmsg_seq,
1822 .event = RTM_NEWADDR,
1823 .flags = NLM_F_MULTI,
1824 .netnsid = -1,
1825 };
1826 struct net *net = sock_net(skb->sk);
1827 struct net *tgt_net = net;
1828 int h, s_h;
1829 int idx, s_idx;
1830 int s_ip_idx;
1831 struct net_device *dev;
1832 struct in_device *in_dev;
1833 struct hlist_head *head;
1834 int err = 0;
1835
1836 s_h = cb->args[0];
1837 s_idx = idx = cb->args[1];
1838 s_ip_idx = cb->args[2];
1839
1840 if (cb->strict_check) {
1841 err = inet_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net,
1842 skb->sk, cb);
1843 if (err < 0)
1844 goto put_tgt_net;
1845
1846 err = 0;
1847 if (fillargs.ifindex) {
1848 dev = __dev_get_by_index(tgt_net, fillargs.ifindex);
1849 if (!dev) {
1850 err = -ENODEV;
1851 goto put_tgt_net;
1852 }
1853
1854 in_dev = __in_dev_get_rtnl(dev);
1855 if (in_dev) {
1856 err = in_dev_dump_addr(in_dev, skb, cb, s_ip_idx,
1857 &fillargs);
1858 }
1859 goto put_tgt_net;
1860 }
1861 }
1862
1863 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1864 idx = 0;
1865 head = &tgt_net->dev_index_head[h];
1866 rcu_read_lock();
1867 cb->seq = inet_base_seq(tgt_net);
1868 hlist_for_each_entry_rcu(dev, head, index_hlist) {
1869 if (idx < s_idx)
1870 goto cont;
1871 if (h > s_h || idx > s_idx)
1872 s_ip_idx = 0;
1873 in_dev = __in_dev_get_rcu(dev);
1874 if (!in_dev)
1875 goto cont;
1876
1877 err = in_dev_dump_addr(in_dev, skb, cb, s_ip_idx,
1878 &fillargs);
1879 if (err < 0) {
1880 rcu_read_unlock();
1881 goto done;
1882 }
1883 cont:
1884 idx++;
1885 }
1886 rcu_read_unlock();
1887 }
1888
1889 done:
1890 cb->args[0] = h;
1891 cb->args[1] = idx;
1892 put_tgt_net:
1893 if (fillargs.netnsid >= 0)
1894 put_net(tgt_net);
1895
1896 return skb->len ? : err;
1897 }
1898
rtmsg_ifa(int event,struct in_ifaddr * ifa,struct nlmsghdr * nlh,u32 portid)1899 static void rtmsg_ifa(int event, struct in_ifaddr *ifa, struct nlmsghdr *nlh,
1900 u32 portid)
1901 {
1902 struct inet_fill_args fillargs = {
1903 .portid = portid,
1904 .seq = nlh ? nlh->nlmsg_seq : 0,
1905 .event = event,
1906 .flags = 0,
1907 .netnsid = -1,
1908 };
1909 struct sk_buff *skb;
1910 int err = -ENOBUFS;
1911 struct net *net;
1912
1913 net = dev_net(ifa->ifa_dev->dev);
1914 skb = nlmsg_new(inet_nlmsg_size(), GFP_KERNEL);
1915 if (!skb)
1916 goto errout;
1917
1918 err = inet_fill_ifaddr(skb, ifa, &fillargs);
1919 if (err < 0) {
1920 /* -EMSGSIZE implies BUG in inet_nlmsg_size() */
1921 WARN_ON(err == -EMSGSIZE);
1922 kfree_skb(skb);
1923 goto errout;
1924 }
1925 rtnl_notify(skb, net, portid, RTNLGRP_IPV4_IFADDR, nlh, GFP_KERNEL);
1926 return;
1927 errout:
1928 if (err < 0)
1929 rtnl_set_sk_err(net, RTNLGRP_IPV4_IFADDR, err);
1930 }
1931
inet_get_link_af_size(const struct net_device * dev,u32 ext_filter_mask)1932 static size_t inet_get_link_af_size(const struct net_device *dev,
1933 u32 ext_filter_mask)
1934 {
1935 struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr);
1936
1937 if (!in_dev)
1938 return 0;
1939
1940 return nla_total_size(IPV4_DEVCONF_MAX * 4); /* IFLA_INET_CONF */
1941 }
1942
inet_fill_link_af(struct sk_buff * skb,const struct net_device * dev,u32 ext_filter_mask)1943 static int inet_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
1944 u32 ext_filter_mask)
1945 {
1946 struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr);
1947 struct nlattr *nla;
1948 int i;
1949
1950 if (!in_dev)
1951 return -ENODATA;
1952
1953 nla = nla_reserve(skb, IFLA_INET_CONF, IPV4_DEVCONF_MAX * 4);
1954 if (!nla)
1955 return -EMSGSIZE;
1956
1957 for (i = 0; i < IPV4_DEVCONF_MAX; i++)
1958 ((u32 *) nla_data(nla))[i] = in_dev->cnf.data[i];
1959
1960 return 0;
1961 }
1962
1963 static const struct nla_policy inet_af_policy[IFLA_INET_MAX+1] = {
1964 [IFLA_INET_CONF] = { .type = NLA_NESTED },
1965 };
1966
inet_validate_link_af(const struct net_device * dev,const struct nlattr * nla)1967 static int inet_validate_link_af(const struct net_device *dev,
1968 const struct nlattr *nla)
1969 {
1970 struct nlattr *a, *tb[IFLA_INET_MAX+1];
1971 int err, rem;
1972
1973 if (dev && !__in_dev_get_rcu(dev))
1974 return -EAFNOSUPPORT;
1975
1976 err = nla_parse_nested_deprecated(tb, IFLA_INET_MAX, nla,
1977 inet_af_policy, NULL);
1978 if (err < 0)
1979 return err;
1980
1981 if (tb[IFLA_INET_CONF]) {
1982 nla_for_each_nested(a, tb[IFLA_INET_CONF], rem) {
1983 int cfgid = nla_type(a);
1984
1985 if (nla_len(a) < 4)
1986 return -EINVAL;
1987
1988 if (cfgid <= 0 || cfgid > IPV4_DEVCONF_MAX)
1989 return -EINVAL;
1990 }
1991 }
1992
1993 return 0;
1994 }
1995
inet_set_link_af(struct net_device * dev,const struct nlattr * nla)1996 static int inet_set_link_af(struct net_device *dev, const struct nlattr *nla)
1997 {
1998 struct in_device *in_dev = __in_dev_get_rcu(dev);
1999 struct nlattr *a, *tb[IFLA_INET_MAX+1];
2000 int rem;
2001
2002 if (!in_dev)
2003 return -EAFNOSUPPORT;
2004
2005 if (nla_parse_nested_deprecated(tb, IFLA_INET_MAX, nla, NULL, NULL) < 0)
2006 return -EINVAL;
2007
2008 if (tb[IFLA_INET_CONF]) {
2009 nla_for_each_nested(a, tb[IFLA_INET_CONF], rem)
2010 ipv4_devconf_set(in_dev, nla_type(a), nla_get_u32(a));
2011 }
2012
2013 return 0;
2014 }
2015
inet_netconf_msgsize_devconf(int type)2016 static int inet_netconf_msgsize_devconf(int type)
2017 {
2018 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
2019 + nla_total_size(4); /* NETCONFA_IFINDEX */
2020 bool all = false;
2021
2022 if (type == NETCONFA_ALL)
2023 all = true;
2024
2025 if (all || type == NETCONFA_FORWARDING)
2026 size += nla_total_size(4);
2027 if (all || type == NETCONFA_RP_FILTER)
2028 size += nla_total_size(4);
2029 if (all || type == NETCONFA_MC_FORWARDING)
2030 size += nla_total_size(4);
2031 if (all || type == NETCONFA_BC_FORWARDING)
2032 size += nla_total_size(4);
2033 if (all || type == NETCONFA_PROXY_NEIGH)
2034 size += nla_total_size(4);
2035 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
2036 size += nla_total_size(4);
2037
2038 return size;
2039 }
2040
inet_netconf_fill_devconf(struct sk_buff * skb,int ifindex,struct ipv4_devconf * devconf,u32 portid,u32 seq,int event,unsigned int flags,int type)2041 static int inet_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
2042 struct ipv4_devconf *devconf, u32 portid,
2043 u32 seq, int event, unsigned int flags,
2044 int type)
2045 {
2046 struct nlmsghdr *nlh;
2047 struct netconfmsg *ncm;
2048 bool all = false;
2049
2050 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
2051 flags);
2052 if (!nlh)
2053 return -EMSGSIZE;
2054
2055 if (type == NETCONFA_ALL)
2056 all = true;
2057
2058 ncm = nlmsg_data(nlh);
2059 ncm->ncm_family = AF_INET;
2060
2061 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
2062 goto nla_put_failure;
2063
2064 if (!devconf)
2065 goto out;
2066
2067 if ((all || type == NETCONFA_FORWARDING) &&
2068 nla_put_s32(skb, NETCONFA_FORWARDING,
2069 IPV4_DEVCONF(*devconf, FORWARDING)) < 0)
2070 goto nla_put_failure;
2071 if ((all || type == NETCONFA_RP_FILTER) &&
2072 nla_put_s32(skb, NETCONFA_RP_FILTER,
2073 IPV4_DEVCONF(*devconf, RP_FILTER)) < 0)
2074 goto nla_put_failure;
2075 if ((all || type == NETCONFA_MC_FORWARDING) &&
2076 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
2077 IPV4_DEVCONF(*devconf, MC_FORWARDING)) < 0)
2078 goto nla_put_failure;
2079 if ((all || type == NETCONFA_BC_FORWARDING) &&
2080 nla_put_s32(skb, NETCONFA_BC_FORWARDING,
2081 IPV4_DEVCONF(*devconf, BC_FORWARDING)) < 0)
2082 goto nla_put_failure;
2083 if ((all || type == NETCONFA_PROXY_NEIGH) &&
2084 nla_put_s32(skb, NETCONFA_PROXY_NEIGH,
2085 IPV4_DEVCONF(*devconf, PROXY_ARP)) < 0)
2086 goto nla_put_failure;
2087 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
2088 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
2089 IPV4_DEVCONF(*devconf, IGNORE_ROUTES_WITH_LINKDOWN)) < 0)
2090 goto nla_put_failure;
2091
2092 out:
2093 nlmsg_end(skb, nlh);
2094 return 0;
2095
2096 nla_put_failure:
2097 nlmsg_cancel(skb, nlh);
2098 return -EMSGSIZE;
2099 }
2100
inet_netconf_notify_devconf(struct net * net,int event,int type,int ifindex,struct ipv4_devconf * devconf)2101 void inet_netconf_notify_devconf(struct net *net, int event, int type,
2102 int ifindex, struct ipv4_devconf *devconf)
2103 {
2104 struct sk_buff *skb;
2105 int err = -ENOBUFS;
2106
2107 skb = nlmsg_new(inet_netconf_msgsize_devconf(type), GFP_KERNEL);
2108 if (!skb)
2109 goto errout;
2110
2111 err = inet_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
2112 event, 0, type);
2113 if (err < 0) {
2114 /* -EMSGSIZE implies BUG in inet_netconf_msgsize_devconf() */
2115 WARN_ON(err == -EMSGSIZE);
2116 kfree_skb(skb);
2117 goto errout;
2118 }
2119 rtnl_notify(skb, net, 0, RTNLGRP_IPV4_NETCONF, NULL, GFP_KERNEL);
2120 return;
2121 errout:
2122 if (err < 0)
2123 rtnl_set_sk_err(net, RTNLGRP_IPV4_NETCONF, err);
2124 }
2125
2126 static const struct nla_policy devconf_ipv4_policy[NETCONFA_MAX+1] = {
2127 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
2128 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
2129 [NETCONFA_RP_FILTER] = { .len = sizeof(int) },
2130 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
2131 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
2132 };
2133
inet_netconf_valid_get_req(struct sk_buff * skb,const struct nlmsghdr * nlh,struct nlattr ** tb,struct netlink_ext_ack * extack)2134 static int inet_netconf_valid_get_req(struct sk_buff *skb,
2135 const struct nlmsghdr *nlh,
2136 struct nlattr **tb,
2137 struct netlink_ext_ack *extack)
2138 {
2139 int i, err;
2140
2141 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) {
2142 NL_SET_ERR_MSG(extack, "ipv4: Invalid header for netconf get request");
2143 return -EINVAL;
2144 }
2145
2146 if (!netlink_strict_get_check(skb))
2147 return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg),
2148 tb, NETCONFA_MAX,
2149 devconf_ipv4_policy, extack);
2150
2151 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg),
2152 tb, NETCONFA_MAX,
2153 devconf_ipv4_policy, extack);
2154 if (err)
2155 return err;
2156
2157 for (i = 0; i <= NETCONFA_MAX; i++) {
2158 if (!tb[i])
2159 continue;
2160
2161 switch (i) {
2162 case NETCONFA_IFINDEX:
2163 break;
2164 default:
2165 NL_SET_ERR_MSG(extack, "ipv4: Unsupported attribute in netconf get request");
2166 return -EINVAL;
2167 }
2168 }
2169
2170 return 0;
2171 }
2172
inet_netconf_get_devconf(struct sk_buff * in_skb,struct nlmsghdr * nlh,struct netlink_ext_ack * extack)2173 static int inet_netconf_get_devconf(struct sk_buff *in_skb,
2174 struct nlmsghdr *nlh,
2175 struct netlink_ext_ack *extack)
2176 {
2177 struct net *net = sock_net(in_skb->sk);
2178 struct nlattr *tb[NETCONFA_MAX+1];
2179 struct sk_buff *skb;
2180 struct ipv4_devconf *devconf;
2181 struct in_device *in_dev;
2182 struct net_device *dev;
2183 int ifindex;
2184 int err;
2185
2186 err = inet_netconf_valid_get_req(in_skb, nlh, tb, extack);
2187 if (err)
2188 goto errout;
2189
2190 err = -EINVAL;
2191 if (!tb[NETCONFA_IFINDEX])
2192 goto errout;
2193
2194 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
2195 switch (ifindex) {
2196 case NETCONFA_IFINDEX_ALL:
2197 devconf = net->ipv4.devconf_all;
2198 break;
2199 case NETCONFA_IFINDEX_DEFAULT:
2200 devconf = net->ipv4.devconf_dflt;
2201 break;
2202 default:
2203 dev = __dev_get_by_index(net, ifindex);
2204 if (!dev)
2205 goto errout;
2206 in_dev = __in_dev_get_rtnl(dev);
2207 if (!in_dev)
2208 goto errout;
2209 devconf = &in_dev->cnf;
2210 break;
2211 }
2212
2213 err = -ENOBUFS;
2214 skb = nlmsg_new(inet_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL);
2215 if (!skb)
2216 goto errout;
2217
2218 err = inet_netconf_fill_devconf(skb, ifindex, devconf,
2219 NETLINK_CB(in_skb).portid,
2220 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
2221 NETCONFA_ALL);
2222 if (err < 0) {
2223 /* -EMSGSIZE implies BUG in inet_netconf_msgsize_devconf() */
2224 WARN_ON(err == -EMSGSIZE);
2225 kfree_skb(skb);
2226 goto errout;
2227 }
2228 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
2229 errout:
2230 return err;
2231 }
2232
inet_netconf_dump_devconf(struct sk_buff * skb,struct netlink_callback * cb)2233 static int inet_netconf_dump_devconf(struct sk_buff *skb,
2234 struct netlink_callback *cb)
2235 {
2236 const struct nlmsghdr *nlh = cb->nlh;
2237 struct net *net = sock_net(skb->sk);
2238 int h, s_h;
2239 int idx, s_idx;
2240 struct net_device *dev;
2241 struct in_device *in_dev;
2242 struct hlist_head *head;
2243
2244 if (cb->strict_check) {
2245 struct netlink_ext_ack *extack = cb->extack;
2246 struct netconfmsg *ncm;
2247
2248 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) {
2249 NL_SET_ERR_MSG(extack, "ipv4: Invalid header for netconf dump request");
2250 return -EINVAL;
2251 }
2252
2253 if (nlmsg_attrlen(nlh, sizeof(*ncm))) {
2254 NL_SET_ERR_MSG(extack, "ipv4: Invalid data after header in netconf dump request");
2255 return -EINVAL;
2256 }
2257 }
2258
2259 s_h = cb->args[0];
2260 s_idx = idx = cb->args[1];
2261
2262 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
2263 idx = 0;
2264 head = &net->dev_index_head[h];
2265 rcu_read_lock();
2266 cb->seq = inet_base_seq(net);
2267 hlist_for_each_entry_rcu(dev, head, index_hlist) {
2268 if (idx < s_idx)
2269 goto cont;
2270 in_dev = __in_dev_get_rcu(dev);
2271 if (!in_dev)
2272 goto cont;
2273
2274 if (inet_netconf_fill_devconf(skb, dev->ifindex,
2275 &in_dev->cnf,
2276 NETLINK_CB(cb->skb).portid,
2277 nlh->nlmsg_seq,
2278 RTM_NEWNETCONF,
2279 NLM_F_MULTI,
2280 NETCONFA_ALL) < 0) {
2281 rcu_read_unlock();
2282 goto done;
2283 }
2284 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2285 cont:
2286 idx++;
2287 }
2288 rcu_read_unlock();
2289 }
2290 if (h == NETDEV_HASHENTRIES) {
2291 if (inet_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
2292 net->ipv4.devconf_all,
2293 NETLINK_CB(cb->skb).portid,
2294 nlh->nlmsg_seq,
2295 RTM_NEWNETCONF, NLM_F_MULTI,
2296 NETCONFA_ALL) < 0)
2297 goto done;
2298 else
2299 h++;
2300 }
2301 if (h == NETDEV_HASHENTRIES + 1) {
2302 if (inet_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
2303 net->ipv4.devconf_dflt,
2304 NETLINK_CB(cb->skb).portid,
2305 nlh->nlmsg_seq,
2306 RTM_NEWNETCONF, NLM_F_MULTI,
2307 NETCONFA_ALL) < 0)
2308 goto done;
2309 else
2310 h++;
2311 }
2312 done:
2313 cb->args[0] = h;
2314 cb->args[1] = idx;
2315
2316 return skb->len;
2317 }
2318
2319 #ifdef CONFIG_SYSCTL
2320
devinet_copy_dflt_conf(struct net * net,int i)2321 static void devinet_copy_dflt_conf(struct net *net, int i)
2322 {
2323 struct net_device *dev;
2324
2325 rcu_read_lock();
2326 for_each_netdev_rcu(net, dev) {
2327 struct in_device *in_dev;
2328
2329 in_dev = __in_dev_get_rcu(dev);
2330 if (in_dev && !test_bit(i, in_dev->cnf.state))
2331 in_dev->cnf.data[i] = net->ipv4.devconf_dflt->data[i];
2332 }
2333 rcu_read_unlock();
2334 }
2335
2336 /* called with RTNL locked */
inet_forward_change(struct net * net)2337 static void inet_forward_change(struct net *net)
2338 {
2339 struct net_device *dev;
2340 int on = IPV4_DEVCONF_ALL(net, FORWARDING);
2341
2342 IPV4_DEVCONF_ALL(net, ACCEPT_REDIRECTS) = !on;
2343 IPV4_DEVCONF_DFLT(net, FORWARDING) = on;
2344 inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
2345 NETCONFA_FORWARDING,
2346 NETCONFA_IFINDEX_ALL,
2347 net->ipv4.devconf_all);
2348 inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
2349 NETCONFA_FORWARDING,
2350 NETCONFA_IFINDEX_DEFAULT,
2351 net->ipv4.devconf_dflt);
2352
2353 for_each_netdev(net, dev) {
2354 struct in_device *in_dev;
2355
2356 if (on)
2357 dev_disable_lro(dev);
2358
2359 in_dev = __in_dev_get_rtnl(dev);
2360 if (in_dev) {
2361 IN_DEV_CONF_SET(in_dev, FORWARDING, on);
2362 inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
2363 NETCONFA_FORWARDING,
2364 dev->ifindex, &in_dev->cnf);
2365 }
2366 }
2367 }
2368
devinet_conf_ifindex(struct net * net,struct ipv4_devconf * cnf)2369 static int devinet_conf_ifindex(struct net *net, struct ipv4_devconf *cnf)
2370 {
2371 if (cnf == net->ipv4.devconf_dflt)
2372 return NETCONFA_IFINDEX_DEFAULT;
2373 else if (cnf == net->ipv4.devconf_all)
2374 return NETCONFA_IFINDEX_ALL;
2375 else {
2376 struct in_device *idev
2377 = container_of(cnf, struct in_device, cnf);
2378 return idev->dev->ifindex;
2379 }
2380 }
2381
devinet_conf_proc(struct ctl_table * ctl,int write,void * buffer,size_t * lenp,loff_t * ppos)2382 static int devinet_conf_proc(struct ctl_table *ctl, int write,
2383 void *buffer, size_t *lenp, loff_t *ppos)
2384 {
2385 int old_value = *(int *)ctl->data;
2386 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
2387 int new_value = *(int *)ctl->data;
2388
2389 if (write) {
2390 struct ipv4_devconf *cnf = ctl->extra1;
2391 struct net *net = ctl->extra2;
2392 int i = (int *)ctl->data - cnf->data;
2393 int ifindex;
2394
2395 set_bit(i, cnf->state);
2396
2397 if (cnf == net->ipv4.devconf_dflt)
2398 devinet_copy_dflt_conf(net, i);
2399 if (i == IPV4_DEVCONF_ACCEPT_LOCAL - 1 ||
2400 i == IPV4_DEVCONF_ROUTE_LOCALNET - 1)
2401 if ((new_value == 0) && (old_value != 0))
2402 rt_cache_flush(net);
2403
2404 if (i == IPV4_DEVCONF_BC_FORWARDING - 1 &&
2405 new_value != old_value)
2406 rt_cache_flush(net);
2407
2408 if (i == IPV4_DEVCONF_RP_FILTER - 1 &&
2409 new_value != old_value) {
2410 ifindex = devinet_conf_ifindex(net, cnf);
2411 inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
2412 NETCONFA_RP_FILTER,
2413 ifindex, cnf);
2414 }
2415 if (i == IPV4_DEVCONF_PROXY_ARP - 1 &&
2416 new_value != old_value) {
2417 ifindex = devinet_conf_ifindex(net, cnf);
2418 inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
2419 NETCONFA_PROXY_NEIGH,
2420 ifindex, cnf);
2421 }
2422 if (i == IPV4_DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN - 1 &&
2423 new_value != old_value) {
2424 ifindex = devinet_conf_ifindex(net, cnf);
2425 inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
2426 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
2427 ifindex, cnf);
2428 }
2429 }
2430
2431 return ret;
2432 }
2433
devinet_sysctl_forward(struct ctl_table * ctl,int write,void * buffer,size_t * lenp,loff_t * ppos)2434 static int devinet_sysctl_forward(struct ctl_table *ctl, int write,
2435 void *buffer, size_t *lenp, loff_t *ppos)
2436 {
2437 int *valp = ctl->data;
2438 int val = *valp;
2439 loff_t pos = *ppos;
2440 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
2441
2442 if (write && *valp != val) {
2443 struct net *net = ctl->extra2;
2444
2445 if (valp != &IPV4_DEVCONF_DFLT(net, FORWARDING)) {
2446 if (!rtnl_trylock()) {
2447 /* Restore the original values before restarting */
2448 *valp = val;
2449 *ppos = pos;
2450 return restart_syscall();
2451 }
2452 if (valp == &IPV4_DEVCONF_ALL(net, FORWARDING)) {
2453 inet_forward_change(net);
2454 } else {
2455 struct ipv4_devconf *cnf = ctl->extra1;
2456 struct in_device *idev =
2457 container_of(cnf, struct in_device, cnf);
2458 if (*valp)
2459 dev_disable_lro(idev->dev);
2460 inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
2461 NETCONFA_FORWARDING,
2462 idev->dev->ifindex,
2463 cnf);
2464 }
2465 rtnl_unlock();
2466 rt_cache_flush(net);
2467 } else
2468 inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
2469 NETCONFA_FORWARDING,
2470 NETCONFA_IFINDEX_DEFAULT,
2471 net->ipv4.devconf_dflt);
2472 }
2473
2474 return ret;
2475 }
2476
ipv4_doint_and_flush(struct ctl_table * ctl,int write,void * buffer,size_t * lenp,loff_t * ppos)2477 static int ipv4_doint_and_flush(struct ctl_table *ctl, int write,
2478 void *buffer, size_t *lenp, loff_t *ppos)
2479 {
2480 int *valp = ctl->data;
2481 int val = *valp;
2482 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
2483 struct net *net = ctl->extra2;
2484
2485 if (write && *valp != val)
2486 rt_cache_flush(net);
2487
2488 return ret;
2489 }
2490
2491 #define DEVINET_SYSCTL_ENTRY(attr, name, mval, proc) \
2492 { \
2493 .procname = name, \
2494 .data = ipv4_devconf.data + \
2495 IPV4_DEVCONF_ ## attr - 1, \
2496 .maxlen = sizeof(int), \
2497 .mode = mval, \
2498 .proc_handler = proc, \
2499 .extra1 = &ipv4_devconf, \
2500 }
2501
2502 #define DEVINET_SYSCTL_RW_ENTRY(attr, name) \
2503 DEVINET_SYSCTL_ENTRY(attr, name, 0644, devinet_conf_proc)
2504
2505 #define DEVINET_SYSCTL_RO_ENTRY(attr, name) \
2506 DEVINET_SYSCTL_ENTRY(attr, name, 0444, devinet_conf_proc)
2507
2508 #define DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, proc) \
2509 DEVINET_SYSCTL_ENTRY(attr, name, 0644, proc)
2510
2511 #define DEVINET_SYSCTL_FLUSHING_ENTRY(attr, name) \
2512 DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, ipv4_doint_and_flush)
2513
2514 static struct devinet_sysctl_table {
2515 struct ctl_table_header *sysctl_header;
2516 struct ctl_table devinet_vars[__IPV4_DEVCONF_MAX];
2517 } devinet_sysctl = {
2518 .devinet_vars = {
2519 DEVINET_SYSCTL_COMPLEX_ENTRY(FORWARDING, "forwarding",
2520 devinet_sysctl_forward),
2521 DEVINET_SYSCTL_RO_ENTRY(MC_FORWARDING, "mc_forwarding"),
2522 DEVINET_SYSCTL_RW_ENTRY(BC_FORWARDING, "bc_forwarding"),
2523
2524 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_REDIRECTS, "accept_redirects"),
2525 DEVINET_SYSCTL_RW_ENTRY(SECURE_REDIRECTS, "secure_redirects"),
2526 DEVINET_SYSCTL_RW_ENTRY(SHARED_MEDIA, "shared_media"),
2527 DEVINET_SYSCTL_RW_ENTRY(RP_FILTER, "rp_filter"),
2528 DEVINET_SYSCTL_RW_ENTRY(SEND_REDIRECTS, "send_redirects"),
2529 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_SOURCE_ROUTE,
2530 "accept_source_route"),
2531 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_LOCAL, "accept_local"),
2532 DEVINET_SYSCTL_RW_ENTRY(SRC_VMARK, "src_valid_mark"),
2533 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP, "proxy_arp"),
2534 DEVINET_SYSCTL_RW_ENTRY(MEDIUM_ID, "medium_id"),
2535 DEVINET_SYSCTL_RW_ENTRY(BOOTP_RELAY, "bootp_relay"),
2536 DEVINET_SYSCTL_RW_ENTRY(LOG_MARTIANS, "log_martians"),
2537 DEVINET_SYSCTL_RW_ENTRY(TAG, "tag"),
2538 DEVINET_SYSCTL_RW_ENTRY(ARPFILTER, "arp_filter"),
2539 DEVINET_SYSCTL_RW_ENTRY(ARP_ANNOUNCE, "arp_announce"),
2540 DEVINET_SYSCTL_RW_ENTRY(ARP_IGNORE, "arp_ignore"),
2541 DEVINET_SYSCTL_RW_ENTRY(ARP_ACCEPT, "arp_accept"),
2542 DEVINET_SYSCTL_RW_ENTRY(ARP_NOTIFY, "arp_notify"),
2543 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP_PVLAN, "proxy_arp_pvlan"),
2544 DEVINET_SYSCTL_RW_ENTRY(FORCE_IGMP_VERSION,
2545 "force_igmp_version"),
2546 DEVINET_SYSCTL_RW_ENTRY(IGMPV2_UNSOLICITED_REPORT_INTERVAL,
2547 "igmpv2_unsolicited_report_interval"),
2548 DEVINET_SYSCTL_RW_ENTRY(IGMPV3_UNSOLICITED_REPORT_INTERVAL,
2549 "igmpv3_unsolicited_report_interval"),
2550 DEVINET_SYSCTL_RW_ENTRY(IGNORE_ROUTES_WITH_LINKDOWN,
2551 "ignore_routes_with_linkdown"),
2552 DEVINET_SYSCTL_RW_ENTRY(DROP_GRATUITOUS_ARP,
2553 "drop_gratuitous_arp"),
2554
2555 DEVINET_SYSCTL_FLUSHING_ENTRY(NOXFRM, "disable_xfrm"),
2556 DEVINET_SYSCTL_FLUSHING_ENTRY(NOPOLICY, "disable_policy"),
2557 DEVINET_SYSCTL_FLUSHING_ENTRY(PROMOTE_SECONDARIES,
2558 "promote_secondaries"),
2559 DEVINET_SYSCTL_FLUSHING_ENTRY(ROUTE_LOCALNET,
2560 "route_localnet"),
2561 DEVINET_SYSCTL_FLUSHING_ENTRY(DROP_UNICAST_IN_L2_MULTICAST,
2562 "drop_unicast_in_l2_multicast"),
2563 },
2564 };
2565
__devinet_sysctl_register(struct net * net,char * dev_name,int ifindex,struct ipv4_devconf * p)2566 static int __devinet_sysctl_register(struct net *net, char *dev_name,
2567 int ifindex, struct ipv4_devconf *p)
2568 {
2569 int i;
2570 struct devinet_sysctl_table *t;
2571 char path[sizeof("net/ipv4/conf/") + IFNAMSIZ];
2572
2573 t = kmemdup(&devinet_sysctl, sizeof(*t), GFP_KERNEL);
2574 if (!t)
2575 goto out;
2576
2577 for (i = 0; i < ARRAY_SIZE(t->devinet_vars) - 1; i++) {
2578 t->devinet_vars[i].data += (char *)p - (char *)&ipv4_devconf;
2579 t->devinet_vars[i].extra1 = p;
2580 t->devinet_vars[i].extra2 = net;
2581 }
2582
2583 snprintf(path, sizeof(path), "net/ipv4/conf/%s", dev_name);
2584
2585 t->sysctl_header = register_net_sysctl(net, path, t->devinet_vars);
2586 if (!t->sysctl_header)
2587 goto free;
2588
2589 p->sysctl = t;
2590
2591 inet_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
2592 ifindex, p);
2593 return 0;
2594
2595 free:
2596 kfree(t);
2597 out:
2598 return -ENOMEM;
2599 }
2600
__devinet_sysctl_unregister(struct net * net,struct ipv4_devconf * cnf,int ifindex)2601 static void __devinet_sysctl_unregister(struct net *net,
2602 struct ipv4_devconf *cnf, int ifindex)
2603 {
2604 struct devinet_sysctl_table *t = cnf->sysctl;
2605
2606 if (t) {
2607 cnf->sysctl = NULL;
2608 unregister_net_sysctl_table(t->sysctl_header);
2609 kfree(t);
2610 }
2611
2612 inet_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
2613 }
2614
devinet_sysctl_register(struct in_device * idev)2615 static int devinet_sysctl_register(struct in_device *idev)
2616 {
2617 int err;
2618
2619 if (!sysctl_dev_name_is_allowed(idev->dev->name))
2620 return -EINVAL;
2621
2622 err = neigh_sysctl_register(idev->dev, idev->arp_parms, NULL);
2623 if (err)
2624 return err;
2625 err = __devinet_sysctl_register(dev_net(idev->dev), idev->dev->name,
2626 idev->dev->ifindex, &idev->cnf);
2627 if (err)
2628 neigh_sysctl_unregister(idev->arp_parms);
2629 return err;
2630 }
2631
devinet_sysctl_unregister(struct in_device * idev)2632 static void devinet_sysctl_unregister(struct in_device *idev)
2633 {
2634 struct net *net = dev_net(idev->dev);
2635
2636 __devinet_sysctl_unregister(net, &idev->cnf, idev->dev->ifindex);
2637 neigh_sysctl_unregister(idev->arp_parms);
2638 }
2639
2640 static struct ctl_table ctl_forward_entry[] = {
2641 {
2642 .procname = "ip_forward",
2643 .data = &ipv4_devconf.data[
2644 IPV4_DEVCONF_FORWARDING - 1],
2645 .maxlen = sizeof(int),
2646 .mode = 0644,
2647 .proc_handler = devinet_sysctl_forward,
2648 .extra1 = &ipv4_devconf,
2649 .extra2 = &init_net,
2650 },
2651 { },
2652 };
2653 #endif
2654
devinet_init_net(struct net * net)2655 static __net_init int devinet_init_net(struct net *net)
2656 {
2657 int err;
2658 struct ipv4_devconf *all, *dflt;
2659 #ifdef CONFIG_SYSCTL
2660 struct ctl_table *tbl;
2661 struct ctl_table_header *forw_hdr;
2662 #endif
2663
2664 err = -ENOMEM;
2665 all = kmemdup(&ipv4_devconf, sizeof(ipv4_devconf), GFP_KERNEL);
2666 if (!all)
2667 goto err_alloc_all;
2668
2669 dflt = kmemdup(&ipv4_devconf_dflt, sizeof(ipv4_devconf_dflt), GFP_KERNEL);
2670 if (!dflt)
2671 goto err_alloc_dflt;
2672
2673 #ifdef CONFIG_SYSCTL
2674 tbl = kmemdup(ctl_forward_entry, sizeof(ctl_forward_entry), GFP_KERNEL);
2675 if (!tbl)
2676 goto err_alloc_ctl;
2677
2678 tbl[0].data = &all->data[IPV4_DEVCONF_FORWARDING - 1];
2679 tbl[0].extra1 = all;
2680 tbl[0].extra2 = net;
2681 #endif
2682
2683 if (!net_eq(net, &init_net)) {
2684 switch (net_inherit_devconf()) {
2685 case 3:
2686 /* copy from the current netns */
2687 memcpy(all, current->nsproxy->net_ns->ipv4.devconf_all,
2688 sizeof(ipv4_devconf));
2689 memcpy(dflt,
2690 current->nsproxy->net_ns->ipv4.devconf_dflt,
2691 sizeof(ipv4_devconf_dflt));
2692 break;
2693 case 0:
2694 case 1:
2695 /* copy from init_net */
2696 memcpy(all, init_net.ipv4.devconf_all,
2697 sizeof(ipv4_devconf));
2698 memcpy(dflt, init_net.ipv4.devconf_dflt,
2699 sizeof(ipv4_devconf_dflt));
2700 break;
2701 case 2:
2702 /* use compiled values */
2703 break;
2704 }
2705 }
2706
2707 #ifdef CONFIG_SYSCTL
2708 err = __devinet_sysctl_register(net, "all", NETCONFA_IFINDEX_ALL, all);
2709 if (err < 0)
2710 goto err_reg_all;
2711
2712 err = __devinet_sysctl_register(net, "default",
2713 NETCONFA_IFINDEX_DEFAULT, dflt);
2714 if (err < 0)
2715 goto err_reg_dflt;
2716
2717 err = -ENOMEM;
2718 forw_hdr = register_net_sysctl(net, "net/ipv4", tbl);
2719 if (!forw_hdr)
2720 goto err_reg_ctl;
2721 net->ipv4.forw_hdr = forw_hdr;
2722 #endif
2723
2724 net->ipv4.devconf_all = all;
2725 net->ipv4.devconf_dflt = dflt;
2726 return 0;
2727
2728 #ifdef CONFIG_SYSCTL
2729 err_reg_ctl:
2730 __devinet_sysctl_unregister(net, dflt, NETCONFA_IFINDEX_DEFAULT);
2731 err_reg_dflt:
2732 __devinet_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL);
2733 err_reg_all:
2734 kfree(tbl);
2735 err_alloc_ctl:
2736 #endif
2737 kfree(dflt);
2738 err_alloc_dflt:
2739 kfree(all);
2740 err_alloc_all:
2741 return err;
2742 }
2743
devinet_exit_net(struct net * net)2744 static __net_exit void devinet_exit_net(struct net *net)
2745 {
2746 #ifdef CONFIG_SYSCTL
2747 struct ctl_table *tbl;
2748
2749 tbl = net->ipv4.forw_hdr->ctl_table_arg;
2750 unregister_net_sysctl_table(net->ipv4.forw_hdr);
2751 __devinet_sysctl_unregister(net, net->ipv4.devconf_dflt,
2752 NETCONFA_IFINDEX_DEFAULT);
2753 __devinet_sysctl_unregister(net, net->ipv4.devconf_all,
2754 NETCONFA_IFINDEX_ALL);
2755 kfree(tbl);
2756 #endif
2757 kfree(net->ipv4.devconf_dflt);
2758 kfree(net->ipv4.devconf_all);
2759 }
2760
2761 static __net_initdata struct pernet_operations devinet_ops = {
2762 .init = devinet_init_net,
2763 .exit = devinet_exit_net,
2764 };
2765
2766 static struct rtnl_af_ops inet_af_ops __read_mostly = {
2767 .family = AF_INET,
2768 .fill_link_af = inet_fill_link_af,
2769 .get_link_af_size = inet_get_link_af_size,
2770 .validate_link_af = inet_validate_link_af,
2771 .set_link_af = inet_set_link_af,
2772 };
2773
devinet_init(void)2774 void __init devinet_init(void)
2775 {
2776 int i;
2777
2778 for (i = 0; i < IN4_ADDR_HSIZE; i++)
2779 INIT_HLIST_HEAD(&inet_addr_lst[i]);
2780
2781 register_pernet_subsys(&devinet_ops);
2782 register_netdevice_notifier(&ip_netdev_notifier);
2783
2784 queue_delayed_work(system_power_efficient_wq, &check_lifetime_work, 0);
2785
2786 rtnl_af_register(&inet_af_ops);
2787
2788 rtnl_register(PF_INET, RTM_NEWADDR, inet_rtm_newaddr, NULL, 0);
2789 rtnl_register(PF_INET, RTM_DELADDR, inet_rtm_deladdr, NULL, 0);
2790 rtnl_register(PF_INET, RTM_GETADDR, NULL, inet_dump_ifaddr, 0);
2791 rtnl_register(PF_INET, RTM_GETNETCONF, inet_netconf_get_devconf,
2792 inet_netconf_dump_devconf, 0);
2793 }
2794