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ALSA: usb-audio: Fix an out-of-bound read in create_composite_quirks
[linux/fpc-iii.git] / net / ipv4 / devinet.c
blob63f99e9a821b0d4c2692e6061454023322c50973
1 /*
2 * NET3 IP device support routines.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
8 *
9 * Derived from the IP parts of dev.c 1.0.19
10 * Authors: Ross Biro
11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 * Mark Evans, <evansmp@uhura.aston.ac.uk>
13 *
14 * Additional Authors:
15 * Alan Cox, <gw4pts@gw4pts.ampr.org>
16 * Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
17 *
18 * Changes:
19 * Alexey Kuznetsov: pa_* fields are replaced with ifaddr
20 * lists.
21 * Cyrus Durgin: updated for kmod
22 * Matthias Andree: in devinet_ioctl, compare label and
23 * address (4.4BSD alias style support),
24 * fall back to comparing just the label
25 * if no match found.
26 */
27
28
29 #include <asm/uaccess.h>
30 #include <linux/bitops.h>
31 #include <linux/capability.h>
32 #include <linux/module.h>
33 #include <linux/types.h>
34 #include <linux/kernel.h>
35 #include <linux/string.h>
36 #include <linux/mm.h>
37 #include <linux/socket.h>
38 #include <linux/sockios.h>
39 #include <linux/in.h>
40 #include <linux/errno.h>
41 #include <linux/interrupt.h>
42 #include <linux/if_addr.h>
43 #include <linux/if_ether.h>
44 #include <linux/inet.h>
45 #include <linux/netdevice.h>
46 #include <linux/etherdevice.h>
47 #include <linux/skbuff.h>
48 #include <linux/init.h>
49 #include <linux/notifier.h>
50 #include <linux/inetdevice.h>
51 #include <linux/igmp.h>
52 #include <linux/slab.h>
53 #include <linux/hash.h>
54 #ifdef CONFIG_SYSCTL
55 #include <linux/sysctl.h>
56 #endif
57 #include <linux/kmod.h>
58 #include <linux/netconf.h>
59
60 #include <net/arp.h>
61 #include <net/ip.h>
62 #include <net/route.h>
63 #include <net/ip_fib.h>
64 #include <net/rtnetlink.h>
65 #include <net/net_namespace.h>
66 #include <net/addrconf.h>
67
68 #include "fib_lookup.h"
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 };
104
105 #define IN4_ADDR_HSIZE_SHIFT 8
106 #define IN4_ADDR_HSIZE (1U << IN4_ADDR_HSIZE_SHIFT)
107
108 static struct hlist_head inet_addr_lst[IN4_ADDR_HSIZE];
109
110 static u32 inet_addr_hash(const struct net *net, __be32 addr)
111 {
112 u32 val = (__force u32) addr ^ net_hash_mix(net);
113
114 return hash_32(val, IN4_ADDR_HSIZE_SHIFT);
115 }
116
117 static void inet_hash_insert(struct net *net, struct in_ifaddr *ifa)
118 {
119 u32 hash = inet_addr_hash(net, ifa->ifa_local);
120
121 ASSERT_RTNL();
122 hlist_add_head_rcu(&ifa->hash, &inet_addr_lst[hash]);
123 }
124
125 static void inet_hash_remove(struct in_ifaddr *ifa)
126 {
127 ASSERT_RTNL();
128 hlist_del_init_rcu(&ifa->hash);
129 }
130
131 /**
132 * __ip_dev_find - find the first device with a given source address.
133 * @net: the net namespace
134 * @addr: the source address
135 * @devref: if true, take a reference on the found device
136 *
137 * If a caller uses devref=false, it should be protected by RCU, or RTNL
138 */
139 struct net_device *__ip_dev_find(struct net *net, __be32 addr, bool devref)
140 {
141 u32 hash = inet_addr_hash(net, addr);
142 struct net_device *result = NULL;
143 struct in_ifaddr *ifa;
144
145 rcu_read_lock();
146 hlist_for_each_entry_rcu(ifa, &inet_addr_lst[hash], hash) {
147 if (ifa->ifa_local == addr) {
148 struct net_device *dev = ifa->ifa_dev->dev;
149
150 if (!net_eq(dev_net(dev), net))
151 continue;
152 result = dev;
153 break;
154 }
155 }
156 if (!result) {
157 struct flowi4 fl4 = { .daddr = addr };
158 struct fib_result res = { 0 };
159 struct fib_table *local;
160
161 /* Fallback to FIB local table so that communication
162 * over loopback subnets work.
163 */
164 local = fib_get_table(net, RT_TABLE_LOCAL);
165 if (local &&
166 !fib_table_lookup(local, &fl4, &res, FIB_LOOKUP_NOREF) &&
167 res.type == RTN_LOCAL)
168 result = FIB_RES_DEV(res);
169 }
170 if (result && devref)
171 dev_hold(result);
172 rcu_read_unlock();
173 return result;
174 }
175 EXPORT_SYMBOL(__ip_dev_find);
176
177 static void rtmsg_ifa(int event, struct in_ifaddr *, struct nlmsghdr *, u32);
178
179 static BLOCKING_NOTIFIER_HEAD(inetaddr_chain);
180 static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
181 int destroy);
182 #ifdef CONFIG_SYSCTL
183 static int devinet_sysctl_register(struct in_device *idev);
184 static void devinet_sysctl_unregister(struct in_device *idev);
185 #else
186 static int devinet_sysctl_register(struct in_device *idev)
187 {
188 return 0;
189 }
190 static void devinet_sysctl_unregister(struct in_device *idev)
191 {
192 }
193 #endif
194
195 /* Locks all the inet devices. */
196
197 static struct in_ifaddr *inet_alloc_ifa(void)
198 {
199 return kzalloc(sizeof(struct in_ifaddr), GFP_KERNEL);
200 }
201
202 static void inet_rcu_free_ifa(struct rcu_head *head)
203 {
204 struct in_ifaddr *ifa = container_of(head, struct in_ifaddr, rcu_head);
205 if (ifa->ifa_dev)
206 in_dev_put(ifa->ifa_dev);
207 kfree(ifa);
208 }
209
210 static void inet_free_ifa(struct in_ifaddr *ifa)
211 {
212 call_rcu(&ifa->rcu_head, inet_rcu_free_ifa);
213 }
214
215 void in_dev_finish_destroy(struct in_device *idev)
216 {
217 struct net_device *dev = idev->dev;
218
219 WARN_ON(idev->ifa_list);
220 WARN_ON(idev->mc_list);
221 kfree(rcu_dereference_protected(idev->mc_hash, 1));
222 #ifdef NET_REFCNT_DEBUG
223 pr_debug("%s: %p=%s\n", __func__, idev, dev ? dev->name : "NIL");
224 #endif
225 dev_put(dev);
226 if (!idev->dead)
227 pr_err("Freeing alive in_device %p\n", idev);
228 else
229 kfree(idev);
230 }
231 EXPORT_SYMBOL(in_dev_finish_destroy);
232
233 static struct in_device *inetdev_init(struct net_device *dev)
234 {
235 struct in_device *in_dev;
236 int err = -ENOMEM;
237
238 ASSERT_RTNL();
239
240 in_dev = kzalloc(sizeof(*in_dev), GFP_KERNEL);
241 if (!in_dev)
242 goto out;
243 memcpy(&in_dev->cnf, dev_net(dev)->ipv4.devconf_dflt,
244 sizeof(in_dev->cnf));
245 in_dev->cnf.sysctl = NULL;
246 in_dev->dev = dev;
247 in_dev->arp_parms = neigh_parms_alloc(dev, &arp_tbl);
248 if (!in_dev->arp_parms)
249 goto out_kfree;
250 if (IPV4_DEVCONF(in_dev->cnf, FORWARDING))
251 dev_disable_lro(dev);
252 /* Reference in_dev->dev */
253 dev_hold(dev);
254 /* Account for reference dev->ip_ptr (below) */
255 in_dev_hold(in_dev);
256
257 err = devinet_sysctl_register(in_dev);
258 if (err) {
259 in_dev->dead = 1;
260 in_dev_put(in_dev);
261 in_dev = NULL;
262 goto out;
263 }
264 ip_mc_init_dev(in_dev);
265 if (dev->flags & IFF_UP)
266 ip_mc_up(in_dev);
267
268 /* we can receive as soon as ip_ptr is set -- do this last */
269 rcu_assign_pointer(dev->ip_ptr, in_dev);
270 out:
271 return in_dev ?: ERR_PTR(err);
272 out_kfree:
273 kfree(in_dev);
274 in_dev = NULL;
275 goto out;
276 }
277
278 static void in_dev_rcu_put(struct rcu_head *head)
279 {
280 struct in_device *idev = container_of(head, struct in_device, rcu_head);
281 in_dev_put(idev);
282 }
283
284 static void inetdev_destroy(struct in_device *in_dev)
285 {
286 struct in_ifaddr *ifa;
287 struct net_device *dev;
288
289 ASSERT_RTNL();
290
291 dev = in_dev->dev;
292
293 in_dev->dead = 1;
294
295 ip_mc_destroy_dev(in_dev);
296
297 while ((ifa = in_dev->ifa_list) != NULL) {
298 inet_del_ifa(in_dev, &in_dev->ifa_list, 0);
299 inet_free_ifa(ifa);
300 }
301
302 RCU_INIT_POINTER(dev->ip_ptr, NULL);
303
304 devinet_sysctl_unregister(in_dev);
305 neigh_parms_release(&arp_tbl, in_dev->arp_parms);
306 arp_ifdown(dev);
307
308 call_rcu(&in_dev->rcu_head, in_dev_rcu_put);
309 }
310
311 int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b)
312 {
313 rcu_read_lock();
314 for_primary_ifa(in_dev) {
315 if (inet_ifa_match(a, ifa)) {
316 if (!b || inet_ifa_match(b, ifa)) {
317 rcu_read_unlock();
318 return 1;
319 }
320 }
321 } endfor_ifa(in_dev);
322 rcu_read_unlock();
323 return 0;
324 }
325
326 static void __inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
327 int destroy, struct nlmsghdr *nlh, u32 portid)
328 {
329 struct in_ifaddr *promote = NULL;
330 struct in_ifaddr *ifa, *ifa1 = *ifap;
331 struct in_ifaddr *last_prim = in_dev->ifa_list;
332 struct in_ifaddr *prev_prom = NULL;
333 int do_promote = IN_DEV_PROMOTE_SECONDARIES(in_dev);
334
335 ASSERT_RTNL();
336
337 if (in_dev->dead)
338 goto no_promotions;
339
340 /* 1. Deleting primary ifaddr forces deletion all secondaries
341 * unless alias promotion is set
342 **/
343
344 if (!(ifa1->ifa_flags & IFA_F_SECONDARY)) {
345 struct in_ifaddr **ifap1 = &ifa1->ifa_next;
346
347 while ((ifa = *ifap1) != NULL) {
348 if (!(ifa->ifa_flags & IFA_F_SECONDARY) &&
349 ifa1->ifa_scope <= ifa->ifa_scope)
350 last_prim = ifa;
351
352 if (!(ifa->ifa_flags & IFA_F_SECONDARY) ||
353 ifa1->ifa_mask != ifa->ifa_mask ||
354 !inet_ifa_match(ifa1->ifa_address, ifa)) {
355 ifap1 = &ifa->ifa_next;
356 prev_prom = ifa;
357 continue;
358 }
359
360 if (!do_promote) {
361 inet_hash_remove(ifa);
362 *ifap1 = ifa->ifa_next;
363
364 rtmsg_ifa(RTM_DELADDR, ifa, nlh, portid);
365 blocking_notifier_call_chain(&inetaddr_chain,
366 NETDEV_DOWN, ifa);
367 inet_free_ifa(ifa);
368 } else {
369 promote = ifa;
370 break;
371 }
372 }
373 }
374
375 /* On promotion all secondaries from subnet are changing
376 * the primary IP, we must remove all their routes silently
377 * and later to add them back with new prefsrc. Do this
378 * while all addresses are on the device list.
379 */
380 for (ifa = promote; ifa; ifa = ifa->ifa_next) {
381 if (ifa1->ifa_mask == ifa->ifa_mask &&
382 inet_ifa_match(ifa1->ifa_address, ifa))
383 fib_del_ifaddr(ifa, ifa1);
384 }
385
386 no_promotions:
387 /* 2. Unlink it */
388
389 *ifap = ifa1->ifa_next;
390 inet_hash_remove(ifa1);
391
392 /* 3. Announce address deletion */
393
394 /* Send message first, then call notifier.
395 At first sight, FIB update triggered by notifier
396 will refer to already deleted ifaddr, that could confuse
397 netlink listeners. It is not true: look, gated sees
398 that route deleted and if it still thinks that ifaddr
399 is valid, it will try to restore deleted routes... Grr.
400 So that, this order is correct.
401 */
402 rtmsg_ifa(RTM_DELADDR, ifa1, nlh, portid);
403 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa1);
404
405 if (promote) {
406 struct in_ifaddr *next_sec = promote->ifa_next;
407
408 if (prev_prom) {
409 prev_prom->ifa_next = promote->ifa_next;
410 promote->ifa_next = last_prim->ifa_next;
411 last_prim->ifa_next = promote;
412 }
413
414 promote->ifa_flags &= ~IFA_F_SECONDARY;
415 rtmsg_ifa(RTM_NEWADDR, promote, nlh, portid);
416 blocking_notifier_call_chain(&inetaddr_chain,
417 NETDEV_UP, promote);
418 for (ifa = next_sec; ifa; ifa = ifa->ifa_next) {
419 if (ifa1->ifa_mask != ifa->ifa_mask ||
420 !inet_ifa_match(ifa1->ifa_address, ifa))
421 continue;
422 fib_add_ifaddr(ifa);
423 }
424
425 }
426 if (destroy)
427 inet_free_ifa(ifa1);
428 }
429
430 static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
431 int destroy)
432 {
433 __inet_del_ifa(in_dev, ifap, destroy, NULL, 0);
434 }
435
436 static void check_lifetime(struct work_struct *work);
437
438 static DECLARE_DELAYED_WORK(check_lifetime_work, check_lifetime);
439
440 static int __inet_insert_ifa(struct in_ifaddr *ifa, struct nlmsghdr *nlh,
441 u32 portid)
442 {
443 struct in_device *in_dev = ifa->ifa_dev;
444 struct in_ifaddr *ifa1, **ifap, **last_primary;
445
446 ASSERT_RTNL();
447
448 if (!ifa->ifa_local) {
449 inet_free_ifa(ifa);
450 return 0;
451 }
452
453 ifa->ifa_flags &= ~IFA_F_SECONDARY;
454 last_primary = &in_dev->ifa_list;
455
456 for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL;
457 ifap = &ifa1->ifa_next) {
458 if (!(ifa1->ifa_flags & IFA_F_SECONDARY) &&
459 ifa->ifa_scope <= ifa1->ifa_scope)
460 last_primary = &ifa1->ifa_next;
461 if (ifa1->ifa_mask == ifa->ifa_mask &&
462 inet_ifa_match(ifa1->ifa_address, ifa)) {
463 if (ifa1->ifa_local == ifa->ifa_local) {
464 inet_free_ifa(ifa);
465 return -EEXIST;
466 }
467 if (ifa1->ifa_scope != ifa->ifa_scope) {
468 inet_free_ifa(ifa);
469 return -EINVAL;
470 }
471 ifa->ifa_flags |= IFA_F_SECONDARY;
472 }
473 }
474
475 if (!(ifa->ifa_flags & IFA_F_SECONDARY)) {
476 prandom_seed((__force u32) ifa->ifa_local);
477 ifap = last_primary;
478 }
479
480 ifa->ifa_next = *ifap;
481 *ifap = ifa;
482
483 inet_hash_insert(dev_net(in_dev->dev), ifa);
484
485 cancel_delayed_work(&check_lifetime_work);
486 queue_delayed_work(system_power_efficient_wq, &check_lifetime_work, 0);
487
488 /* Send message first, then call notifier.
489 Notifier will trigger FIB update, so that
490 listeners of netlink will know about new ifaddr */
491 rtmsg_ifa(RTM_NEWADDR, ifa, nlh, portid);
492 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa);
493
494 return 0;
495 }
496
497 static int inet_insert_ifa(struct in_ifaddr *ifa)
498 {
499 return __inet_insert_ifa(ifa, NULL, 0);
500 }
501
502 static int inet_set_ifa(struct net_device *dev, struct in_ifaddr *ifa)
503 {
504 struct in_device *in_dev = __in_dev_get_rtnl(dev);
505
506 ASSERT_RTNL();
507
508 if (!in_dev) {
509 inet_free_ifa(ifa);
510 return -ENOBUFS;
511 }
512 ipv4_devconf_setall(in_dev);
513 neigh_parms_data_state_setall(in_dev->arp_parms);
514 if (ifa->ifa_dev != in_dev) {
515 WARN_ON(ifa->ifa_dev);
516 in_dev_hold(in_dev);
517 ifa->ifa_dev = in_dev;
518 }
519 if (ipv4_is_loopback(ifa->ifa_local))
520 ifa->ifa_scope = RT_SCOPE_HOST;
521 return inet_insert_ifa(ifa);
522 }
523
524 /* Caller must hold RCU or RTNL :
525 * We dont take a reference on found in_device
526 */
527 struct in_device *inetdev_by_index(struct net *net, int ifindex)
528 {
529 struct net_device *dev;
530 struct in_device *in_dev = NULL;
531
532 rcu_read_lock();
533 dev = dev_get_by_index_rcu(net, ifindex);
534 if (dev)
535 in_dev = rcu_dereference_rtnl(dev->ip_ptr);
536 rcu_read_unlock();
537 return in_dev;
538 }
539 EXPORT_SYMBOL(inetdev_by_index);
540
541 /* Called only from RTNL semaphored context. No locks. */
542
543 struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix,
544 __be32 mask)
545 {
546 ASSERT_RTNL();
547
548 for_primary_ifa(in_dev) {
549 if (ifa->ifa_mask == mask && inet_ifa_match(prefix, ifa))
550 return ifa;
551 } endfor_ifa(in_dev);
552 return NULL;
553 }
554
555 static int ip_mc_config(struct sock *sk, bool join, const struct in_ifaddr *ifa)
556 {
557 struct ip_mreqn mreq = {
558 .imr_multiaddr.s_addr = ifa->ifa_address,
559 .imr_ifindex = ifa->ifa_dev->dev->ifindex,
560 };
561 int ret;
562
563 ASSERT_RTNL();
564
565 lock_sock(sk);
566 if (join)
567 ret = ip_mc_join_group(sk, &mreq);
568 else
569 ret = ip_mc_leave_group(sk, &mreq);
570 release_sock(sk);
571
572 return ret;
573 }
574
575 static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
576 {
577 struct net *net = sock_net(skb->sk);
578 struct nlattr *tb[IFA_MAX+1];
579 struct in_device *in_dev;
580 struct ifaddrmsg *ifm;
581 struct in_ifaddr *ifa, **ifap;
582 int err = -EINVAL;
583
584 ASSERT_RTNL();
585
586 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy);
587 if (err < 0)
588 goto errout;
589
590 ifm = nlmsg_data(nlh);
591 in_dev = inetdev_by_index(net, ifm->ifa_index);
592 if (!in_dev) {
593 err = -ENODEV;
594 goto errout;
595 }
596
597 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
598 ifap = &ifa->ifa_next) {
599 if (tb[IFA_LOCAL] &&
600 ifa->ifa_local != nla_get_in_addr(tb[IFA_LOCAL]))
601 continue;
602
603 if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label))
604 continue;
605
606 if (tb[IFA_ADDRESS] &&
607 (ifm->ifa_prefixlen != ifa->ifa_prefixlen ||
608 !inet_ifa_match(nla_get_in_addr(tb[IFA_ADDRESS]), ifa)))
609 continue;
610
611 if (ipv4_is_multicast(ifa->ifa_address))
612 ip_mc_config(net->ipv4.mc_autojoin_sk, false, ifa);
613 __inet_del_ifa(in_dev, ifap, 1, nlh, NETLINK_CB(skb).portid);
614 return 0;
615 }
616
617 err = -EADDRNOTAVAIL;
618 errout:
619 return err;
620 }
621
622 #define INFINITY_LIFE_TIME 0xFFFFFFFF
623
624 static void check_lifetime(struct work_struct *work)
625 {
626 unsigned long now, next, next_sec, next_sched;
627 struct in_ifaddr *ifa;
628 struct hlist_node *n;
629 int i;
630
631 now = jiffies;
632 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
633
634 for (i = 0; i < IN4_ADDR_HSIZE; i++) {
635 bool change_needed = false;
636
637 rcu_read_lock();
638 hlist_for_each_entry_rcu(ifa, &inet_addr_lst[i], hash) {
639 unsigned long age;
640
641 if (ifa->ifa_flags & IFA_F_PERMANENT)
642 continue;
643
644 /* We try to batch several events at once. */
645 age = (now - ifa->ifa_tstamp +
646 ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
647
648 if (ifa->ifa_valid_lft != INFINITY_LIFE_TIME &&
649 age >= ifa->ifa_valid_lft) {
650 change_needed = true;
651 } else if (ifa->ifa_preferred_lft ==
652 INFINITY_LIFE_TIME) {
653 continue;
654 } else if (age >= ifa->ifa_preferred_lft) {
655 if (time_before(ifa->ifa_tstamp +
656 ifa->ifa_valid_lft * HZ, next))
657 next = ifa->ifa_tstamp +
658 ifa->ifa_valid_lft * HZ;
659
660 if (!(ifa->ifa_flags & IFA_F_DEPRECATED))
661 change_needed = true;
662 } else if (time_before(ifa->ifa_tstamp +
663 ifa->ifa_preferred_lft * HZ,
664 next)) {
665 next = ifa->ifa_tstamp +
666 ifa->ifa_preferred_lft * HZ;
667 }
668 }
669 rcu_read_unlock();
670 if (!change_needed)
671 continue;
672 rtnl_lock();
673 hlist_for_each_entry_safe(ifa, n, &inet_addr_lst[i], hash) {
674 unsigned long age;
675
676 if (ifa->ifa_flags & IFA_F_PERMANENT)
677 continue;
678
679 /* We try to batch several events at once. */
680 age = (now - ifa->ifa_tstamp +
681 ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
682
683 if (ifa->ifa_valid_lft != INFINITY_LIFE_TIME &&
684 age >= ifa->ifa_valid_lft) {
685 struct in_ifaddr **ifap;
686
687 for (ifap = &ifa->ifa_dev->ifa_list;
688 *ifap != NULL; ifap = &(*ifap)->ifa_next) {
689 if (*ifap == ifa) {
690 inet_del_ifa(ifa->ifa_dev,
691 ifap, 1);
692 break;
693 }
694 }
695 } else if (ifa->ifa_preferred_lft !=
696 INFINITY_LIFE_TIME &&
697 age >= ifa->ifa_preferred_lft &&
698 !(ifa->ifa_flags & IFA_F_DEPRECATED)) {
699 ifa->ifa_flags |= IFA_F_DEPRECATED;
700 rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0);
701 }
702 }
703 rtnl_unlock();
704 }
705
706 next_sec = round_jiffies_up(next);
707 next_sched = next;
708
709 /* If rounded timeout is accurate enough, accept it. */
710 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
711 next_sched = next_sec;
712
713 now = jiffies;
714 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
715 if (time_before(next_sched, now + ADDRCONF_TIMER_FUZZ_MAX))
716 next_sched = now + ADDRCONF_TIMER_FUZZ_MAX;
717
718 queue_delayed_work(system_power_efficient_wq, &check_lifetime_work,
719 next_sched - now);
720 }
721
722 static void set_ifa_lifetime(struct in_ifaddr *ifa, __u32 valid_lft,
723 __u32 prefered_lft)
724 {
725 unsigned long timeout;
726
727 ifa->ifa_flags &= ~(IFA_F_PERMANENT | IFA_F_DEPRECATED);
728
729 timeout = addrconf_timeout_fixup(valid_lft, HZ);
730 if (addrconf_finite_timeout(timeout))
731 ifa->ifa_valid_lft = timeout;
732 else
733 ifa->ifa_flags |= IFA_F_PERMANENT;
734
735 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
736 if (addrconf_finite_timeout(timeout)) {
737 if (timeout == 0)
738 ifa->ifa_flags |= IFA_F_DEPRECATED;
739 ifa->ifa_preferred_lft = timeout;
740 }
741 ifa->ifa_tstamp = jiffies;
742 if (!ifa->ifa_cstamp)
743 ifa->ifa_cstamp = ifa->ifa_tstamp;
744 }
745
746 static struct in_ifaddr *rtm_to_ifaddr(struct net *net, struct nlmsghdr *nlh,
747 __u32 *pvalid_lft, __u32 *pprefered_lft)
748 {
749 struct nlattr *tb[IFA_MAX+1];
750 struct in_ifaddr *ifa;
751 struct ifaddrmsg *ifm;
752 struct net_device *dev;
753 struct in_device *in_dev;
754 int err;
755
756 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy);
757 if (err < 0)
758 goto errout;
759
760 ifm = nlmsg_data(nlh);
761 err = -EINVAL;
762 if (ifm->ifa_prefixlen > 32 || !tb[IFA_LOCAL])
763 goto errout;
764
765 dev = __dev_get_by_index(net, ifm->ifa_index);
766 err = -ENODEV;
767 if (!dev)
768 goto errout;
769
770 in_dev = __in_dev_get_rtnl(dev);
771 err = -ENOBUFS;
772 if (!in_dev)
773 goto errout;
774
775 ifa = inet_alloc_ifa();
776 if (!ifa)
777 /*
778 * A potential indev allocation can be left alive, it stays
779 * assigned to its device and is destroy with it.
780 */
781 goto errout;
782
783 ipv4_devconf_setall(in_dev);
784 neigh_parms_data_state_setall(in_dev->arp_parms);
785 in_dev_hold(in_dev);
786
787 if (!tb[IFA_ADDRESS])
788 tb[IFA_ADDRESS] = tb[IFA_LOCAL];
789
790 INIT_HLIST_NODE(&ifa->hash);
791 ifa->ifa_prefixlen = ifm->ifa_prefixlen;
792 ifa->ifa_mask = inet_make_mask(ifm->ifa_prefixlen);
793 ifa->ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) :
794 ifm->ifa_flags;
795 ifa->ifa_scope = ifm->ifa_scope;
796 ifa->ifa_dev = in_dev;
797
798 ifa->ifa_local = nla_get_in_addr(tb[IFA_LOCAL]);
799 ifa->ifa_address = nla_get_in_addr(tb[IFA_ADDRESS]);
800
801 if (tb[IFA_BROADCAST])
802 ifa->ifa_broadcast = nla_get_in_addr(tb[IFA_BROADCAST]);
803
804 if (tb[IFA_LABEL])
805 nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ);
806 else
807 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
808
809 if (tb[IFA_CACHEINFO]) {
810 struct ifa_cacheinfo *ci;
811
812 ci = nla_data(tb[IFA_CACHEINFO]);
813 if (!ci->ifa_valid || ci->ifa_prefered > ci->ifa_valid) {
814 err = -EINVAL;
815 goto errout_free;
816 }
817 *pvalid_lft = ci->ifa_valid;
818 *pprefered_lft = ci->ifa_prefered;
819 }
820
821 return ifa;
822
823 errout_free:
824 inet_free_ifa(ifa);
825 errout:
826 return ERR_PTR(err);
827 }
828
829 static struct in_ifaddr *find_matching_ifa(struct in_ifaddr *ifa)
830 {
831 struct in_device *in_dev = ifa->ifa_dev;
832 struct in_ifaddr *ifa1, **ifap;
833
834 if (!ifa->ifa_local)
835 return NULL;
836
837 for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL;
838 ifap = &ifa1->ifa_next) {
839 if (ifa1->ifa_mask == ifa->ifa_mask &&
840 inet_ifa_match(ifa1->ifa_address, ifa) &&
841 ifa1->ifa_local == ifa->ifa_local)
842 return ifa1;
843 }
844 return NULL;
845 }
846
847 static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
848 {
849 struct net *net = sock_net(skb->sk);
850 struct in_ifaddr *ifa;
851 struct in_ifaddr *ifa_existing;
852 __u32 valid_lft = INFINITY_LIFE_TIME;
853 __u32 prefered_lft = INFINITY_LIFE_TIME;
854
855 ASSERT_RTNL();
856
857 ifa = rtm_to_ifaddr(net, nlh, &valid_lft, &prefered_lft);
858 if (IS_ERR(ifa))
859 return PTR_ERR(ifa);
860
861 ifa_existing = find_matching_ifa(ifa);
862 if (!ifa_existing) {
863 /* It would be best to check for !NLM_F_CREATE here but
864 * userspace already relies on not having to provide this.
865 */
866 set_ifa_lifetime(ifa, valid_lft, prefered_lft);
867 if (ifa->ifa_flags & IFA_F_MCAUTOJOIN) {
868 int ret = ip_mc_config(net->ipv4.mc_autojoin_sk,
869 true, ifa);
870
871 if (ret < 0) {
872 inet_free_ifa(ifa);
873 return ret;
874 }
875 }
876 return __inet_insert_ifa(ifa, nlh, NETLINK_CB(skb).portid);
877 } else {
878 inet_free_ifa(ifa);
879
880 if (nlh->nlmsg_flags & NLM_F_EXCL ||
881 !(nlh->nlmsg_flags & NLM_F_REPLACE))
882 return -EEXIST;
883 ifa = ifa_existing;
884 set_ifa_lifetime(ifa, valid_lft, prefered_lft);
885 cancel_delayed_work(&check_lifetime_work);
886 queue_delayed_work(system_power_efficient_wq,
887 &check_lifetime_work, 0);
888 rtmsg_ifa(RTM_NEWADDR, ifa, nlh, NETLINK_CB(skb).portid);
889 }
890 return 0;
891 }
892
893 /*
894 * Determine a default network mask, based on the IP address.
895 */
896
897 static int inet_abc_len(__be32 addr)
898 {
899 int rc = -1; /* Something else, probably a multicast. */
900
901 if (ipv4_is_zeronet(addr))
902 rc = 0;
903 else {
904 __u32 haddr = ntohl(addr);
905
906 if (IN_CLASSA(haddr))
907 rc = 8;
908 else if (IN_CLASSB(haddr))
909 rc = 16;
910 else if (IN_CLASSC(haddr))
911 rc = 24;
912 }
913
914 return rc;
915 }
916
917
918 int devinet_ioctl(struct net *net, unsigned int cmd, void __user *arg)
919 {
920 struct ifreq ifr;
921 struct sockaddr_in sin_orig;
922 struct sockaddr_in *sin = (struct sockaddr_in *)&ifr.ifr_addr;
923 struct in_device *in_dev;
924 struct in_ifaddr **ifap = NULL;
925 struct in_ifaddr *ifa = NULL;
926 struct net_device *dev;
927 char *colon;
928 int ret = -EFAULT;
929 int tryaddrmatch = 0;
930
931 /*
932 * Fetch the caller's info block into kernel space
933 */
934
935 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
936 goto out;
937 ifr.ifr_name[IFNAMSIZ - 1] = 0;
938
939 /* save original address for comparison */
940 memcpy(&sin_orig, sin, sizeof(*sin));
941
942 colon = strchr(ifr.ifr_name, ':');
943 if (colon)
944 *colon = 0;
945
946 dev_load(net, ifr.ifr_name);
947
948 switch (cmd) {
949 case SIOCGIFADDR: /* Get interface address */
950 case SIOCGIFBRDADDR: /* Get the broadcast address */
951 case SIOCGIFDSTADDR: /* Get the destination address */
952 case SIOCGIFNETMASK: /* Get the netmask for the interface */
953 /* Note that these ioctls will not sleep,
954 so that we do not impose a lock.
955 One day we will be forced to put shlock here (I mean SMP)
956 */
957 tryaddrmatch = (sin_orig.sin_family == AF_INET);
958 memset(sin, 0, sizeof(*sin));
959 sin->sin_family = AF_INET;
960 break;
961
962 case SIOCSIFFLAGS:
963 ret = -EPERM;
964 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
965 goto out;
966 break;
967 case SIOCSIFADDR: /* Set interface address (and family) */
968 case SIOCSIFBRDADDR: /* Set the broadcast address */
969 case SIOCSIFDSTADDR: /* Set the destination address */
970 case SIOCSIFNETMASK: /* Set the netmask for the interface */
971 ret = -EPERM;
972 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
973 goto out;
974 ret = -EINVAL;
975 if (sin->sin_family != AF_INET)
976 goto out;
977 break;
978 default:
979 ret = -EINVAL;
980 goto out;
981 }
982
983 rtnl_lock();
984
985 ret = -ENODEV;
986 dev = __dev_get_by_name(net, ifr.ifr_name);
987 if (!dev)
988 goto done;
989
990 if (colon)
991 *colon = ':';
992
993 in_dev = __in_dev_get_rtnl(dev);
994 if (in_dev) {
995 if (tryaddrmatch) {
996 /* Matthias Andree */
997 /* compare label and address (4.4BSD style) */
998 /* note: we only do this for a limited set of ioctls
999 and only if the original address family was AF_INET.
1000 This is checked above. */
1001 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
1002 ifap = &ifa->ifa_next) {
1003 if (!strcmp(ifr.ifr_name, ifa->ifa_label) &&
1004 sin_orig.sin_addr.s_addr ==
1005 ifa->ifa_local) {
1006 break; /* found */
1007 }
1008 }
1009 }
1010 /* we didn't get a match, maybe the application is
1011 4.3BSD-style and passed in junk so we fall back to
1012 comparing just the label */
1013 if (!ifa) {
1014 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
1015 ifap = &ifa->ifa_next)
1016 if (!strcmp(ifr.ifr_name, ifa->ifa_label))
1017 break;
1018 }
1019 }
1020
1021 ret = -EADDRNOTAVAIL;
1022 if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS)
1023 goto done;
1024
1025 switch (cmd) {
1026 case SIOCGIFADDR: /* Get interface address */
1027 sin->sin_addr.s_addr = ifa->ifa_local;
1028 goto rarok;
1029
1030 case SIOCGIFBRDADDR: /* Get the broadcast address */
1031 sin->sin_addr.s_addr = ifa->ifa_broadcast;
1032 goto rarok;
1033
1034 case SIOCGIFDSTADDR: /* Get the destination address */
1035 sin->sin_addr.s_addr = ifa->ifa_address;
1036 goto rarok;
1037
1038 case SIOCGIFNETMASK: /* Get the netmask for the interface */
1039 sin->sin_addr.s_addr = ifa->ifa_mask;
1040 goto rarok;
1041
1042 case SIOCSIFFLAGS:
1043 if (colon) {
1044 ret = -EADDRNOTAVAIL;
1045 if (!ifa)
1046 break;
1047 ret = 0;
1048 if (!(ifr.ifr_flags & IFF_UP))
1049 inet_del_ifa(in_dev, ifap, 1);
1050 break;
1051 }
1052 ret = dev_change_flags(dev, ifr.ifr_flags);
1053 break;
1054
1055 case SIOCSIFADDR: /* Set interface address (and family) */
1056 ret = -EINVAL;
1057 if (inet_abc_len(sin->sin_addr.s_addr) < 0)
1058 break;
1059
1060 if (!ifa) {
1061 ret = -ENOBUFS;
1062 ifa = inet_alloc_ifa();
1063 if (!ifa)
1064 break;
1065 INIT_HLIST_NODE(&ifa->hash);
1066 if (colon)
1067 memcpy(ifa->ifa_label, ifr.ifr_name, IFNAMSIZ);
1068 else
1069 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1070 } else {
1071 ret = 0;
1072 if (ifa->ifa_local == sin->sin_addr.s_addr)
1073 break;
1074 inet_del_ifa(in_dev, ifap, 0);
1075 ifa->ifa_broadcast = 0;
1076 ifa->ifa_scope = 0;
1077 }
1078
1079 ifa->ifa_address = ifa->ifa_local = sin->sin_addr.s_addr;
1080
1081 if (!(dev->flags & IFF_POINTOPOINT)) {
1082 ifa->ifa_prefixlen = inet_abc_len(ifa->ifa_address);
1083 ifa->ifa_mask = inet_make_mask(ifa->ifa_prefixlen);
1084 if ((dev->flags & IFF_BROADCAST) &&
1085 ifa->ifa_prefixlen < 31)
1086 ifa->ifa_broadcast = ifa->ifa_address |
1087 ~ifa->ifa_mask;
1088 } else {
1089 ifa->ifa_prefixlen = 32;
1090 ifa->ifa_mask = inet_make_mask(32);
1091 }
1092 set_ifa_lifetime(ifa, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1093 ret = inet_set_ifa(dev, ifa);
1094 break;
1095
1096 case SIOCSIFBRDADDR: /* Set the broadcast address */
1097 ret = 0;
1098 if (ifa->ifa_broadcast != sin->sin_addr.s_addr) {
1099 inet_del_ifa(in_dev, ifap, 0);
1100 ifa->ifa_broadcast = sin->sin_addr.s_addr;
1101 inet_insert_ifa(ifa);
1102 }
1103 break;
1104
1105 case SIOCSIFDSTADDR: /* Set the destination address */
1106 ret = 0;
1107 if (ifa->ifa_address == sin->sin_addr.s_addr)
1108 break;
1109 ret = -EINVAL;
1110 if (inet_abc_len(sin->sin_addr.s_addr) < 0)
1111 break;
1112 ret = 0;
1113 inet_del_ifa(in_dev, ifap, 0);
1114 ifa->ifa_address = sin->sin_addr.s_addr;
1115 inet_insert_ifa(ifa);
1116 break;
1117
1118 case SIOCSIFNETMASK: /* Set the netmask for the interface */
1119
1120 /*
1121 * The mask we set must be legal.
1122 */
1123 ret = -EINVAL;
1124 if (bad_mask(sin->sin_addr.s_addr, 0))
1125 break;
1126 ret = 0;
1127 if (ifa->ifa_mask != sin->sin_addr.s_addr) {
1128 __be32 old_mask = ifa->ifa_mask;
1129 inet_del_ifa(in_dev, ifap, 0);
1130 ifa->ifa_mask = sin->sin_addr.s_addr;
1131 ifa->ifa_prefixlen = inet_mask_len(ifa->ifa_mask);
1132
1133 /* See if current broadcast address matches
1134 * with current netmask, then recalculate
1135 * the broadcast address. Otherwise it's a
1136 * funny address, so don't touch it since
1137 * the user seems to know what (s)he's doing...
1138 */
1139 if ((dev->flags & IFF_BROADCAST) &&
1140 (ifa->ifa_prefixlen < 31) &&
1141 (ifa->ifa_broadcast ==
1142 (ifa->ifa_local|~old_mask))) {
1143 ifa->ifa_broadcast = (ifa->ifa_local |
1144 ~sin->sin_addr.s_addr);
1145 }
1146 inet_insert_ifa(ifa);
1147 }
1148 break;
1149 }
1150 done:
1151 rtnl_unlock();
1152 out:
1153 return ret;
1154 rarok:
1155 rtnl_unlock();
1156 ret = copy_to_user(arg, &ifr, sizeof(struct ifreq)) ? -EFAULT : 0;
1157 goto out;
1158 }
1159
1160 static int inet_gifconf(struct net_device *dev, char __user *buf, int len)
1161 {
1162 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1163 struct in_ifaddr *ifa;
1164 struct ifreq ifr;
1165 int done = 0;
1166
1167 if (!in_dev)
1168 goto out;
1169
1170 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1171 if (!buf) {
1172 done += sizeof(ifr);
1173 continue;
1174 }
1175 if (len < (int) sizeof(ifr))
1176 break;
1177 memset(&ifr, 0, sizeof(struct ifreq));
1178 strcpy(ifr.ifr_name, ifa->ifa_label);
1179
1180 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_family = AF_INET;
1181 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_addr.s_addr =
1182 ifa->ifa_local;
1183
1184 if (copy_to_user(buf, &ifr, sizeof(struct ifreq))) {
1185 done = -EFAULT;
1186 break;
1187 }
1188 buf += sizeof(struct ifreq);
1189 len -= sizeof(struct ifreq);
1190 done += sizeof(struct ifreq);
1191 }
1192 out:
1193 return done;
1194 }
1195
1196 __be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope)
1197 {
1198 __be32 addr = 0;
1199 struct in_device *in_dev;
1200 struct net *net = dev_net(dev);
1201
1202 rcu_read_lock();
1203 in_dev = __in_dev_get_rcu(dev);
1204 if (!in_dev)
1205 goto no_in_dev;
1206
1207 for_primary_ifa(in_dev) {
1208 if (ifa->ifa_scope > scope)
1209 continue;
1210 if (!dst || inet_ifa_match(dst, ifa)) {
1211 addr = ifa->ifa_local;
1212 break;
1213 }
1214 if (!addr)
1215 addr = ifa->ifa_local;
1216 } endfor_ifa(in_dev);
1217
1218 if (addr)
1219 goto out_unlock;
1220 no_in_dev:
1221
1222 /* Not loopback addresses on loopback should be preferred
1223 in this case. It is important that lo is the first interface
1224 in dev_base list.
1225 */
1226 for_each_netdev_rcu(net, dev) {
1227 in_dev = __in_dev_get_rcu(dev);
1228 if (!in_dev)
1229 continue;
1230
1231 for_primary_ifa(in_dev) {
1232 if (ifa->ifa_scope != RT_SCOPE_LINK &&
1233 ifa->ifa_scope <= scope) {
1234 addr = ifa->ifa_local;
1235 goto out_unlock;
1236 }
1237 } endfor_ifa(in_dev);
1238 }
1239 out_unlock:
1240 rcu_read_unlock();
1241 return addr;
1242 }
1243 EXPORT_SYMBOL(inet_select_addr);
1244
1245 static __be32 confirm_addr_indev(struct in_device *in_dev, __be32 dst,
1246 __be32 local, int scope)
1247 {
1248 int same = 0;
1249 __be32 addr = 0;
1250
1251 for_ifa(in_dev) {
1252 if (!addr &&
1253 (local == ifa->ifa_local || !local) &&
1254 ifa->ifa_scope <= scope) {
1255 addr = ifa->ifa_local;
1256 if (same)
1257 break;
1258 }
1259 if (!same) {
1260 same = (!local || inet_ifa_match(local, ifa)) &&
1261 (!dst || inet_ifa_match(dst, ifa));
1262 if (same && addr) {
1263 if (local || !dst)
1264 break;
1265 /* Is the selected addr into dst subnet? */
1266 if (inet_ifa_match(addr, ifa))
1267 break;
1268 /* No, then can we use new local src? */
1269 if (ifa->ifa_scope <= scope) {
1270 addr = ifa->ifa_local;
1271 break;
1272 }
1273 /* search for large dst subnet for addr */
1274 same = 0;
1275 }
1276 }
1277 } endfor_ifa(in_dev);
1278
1279 return same ? addr : 0;
1280 }
1281
1282 /*
1283 * Confirm that local IP address exists using wildcards:
1284 * - net: netns to check, cannot be NULL
1285 * - in_dev: only on this interface, NULL=any interface
1286 * - dst: only in the same subnet as dst, 0=any dst
1287 * - local: address, 0=autoselect the local address
1288 * - scope: maximum allowed scope value for the local address
1289 */
1290 __be32 inet_confirm_addr(struct net *net, struct in_device *in_dev,
1291 __be32 dst, __be32 local, int scope)
1292 {
1293 __be32 addr = 0;
1294 struct net_device *dev;
1295
1296 if (in_dev)
1297 return confirm_addr_indev(in_dev, dst, local, scope);
1298
1299 rcu_read_lock();
1300 for_each_netdev_rcu(net, dev) {
1301 in_dev = __in_dev_get_rcu(dev);
1302 if (in_dev) {
1303 addr = confirm_addr_indev(in_dev, dst, local, scope);
1304 if (addr)
1305 break;
1306 }
1307 }
1308 rcu_read_unlock();
1309
1310 return addr;
1311 }
1312 EXPORT_SYMBOL(inet_confirm_addr);
1313
1314 /*
1315 * Device notifier
1316 */
1317
1318 int register_inetaddr_notifier(struct notifier_block *nb)
1319 {
1320 return blocking_notifier_chain_register(&inetaddr_chain, nb);
1321 }
1322 EXPORT_SYMBOL(register_inetaddr_notifier);
1323
1324 int unregister_inetaddr_notifier(struct notifier_block *nb)
1325 {
1326 return blocking_notifier_chain_unregister(&inetaddr_chain, nb);
1327 }
1328 EXPORT_SYMBOL(unregister_inetaddr_notifier);
1329
1330 /* Rename ifa_labels for a device name change. Make some effort to preserve
1331 * existing alias numbering and to create unique labels if possible.
1332 */
1333 static void inetdev_changename(struct net_device *dev, struct in_device *in_dev)
1334 {
1335 struct in_ifaddr *ifa;
1336 int named = 0;
1337
1338 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1339 char old[IFNAMSIZ], *dot;
1340
1341 memcpy(old, ifa->ifa_label, IFNAMSIZ);
1342 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1343 if (named++ == 0)
1344 goto skip;
1345 dot = strchr(old, ':');
1346 if (!dot) {
1347 sprintf(old, ":%d", named);
1348 dot = old;
1349 }
1350 if (strlen(dot) + strlen(dev->name) < IFNAMSIZ)
1351 strcat(ifa->ifa_label, dot);
1352 else
1353 strcpy(ifa->ifa_label + (IFNAMSIZ - strlen(dot) - 1), dot);
1354 skip:
1355 rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0);
1356 }
1357 }
1358
1359 static bool inetdev_valid_mtu(unsigned int mtu)
1360 {
1361 return mtu >= IPV4_MIN_MTU;
1362 }
1363
1364 static void inetdev_send_gratuitous_arp(struct net_device *dev,
1365 struct in_device *in_dev)
1366
1367 {
1368 struct in_ifaddr *ifa;
1369
1370 for (ifa = in_dev->ifa_list; ifa;
1371 ifa = ifa->ifa_next) {
1372 arp_send(ARPOP_REQUEST, ETH_P_ARP,
1373 ifa->ifa_local, dev,
1374 ifa->ifa_local, NULL,
1375 dev->dev_addr, NULL);
1376 }
1377 }
1378
1379 /* Called only under RTNL semaphore */
1380
1381 static int inetdev_event(struct notifier_block *this, unsigned long event,
1382 void *ptr)
1383 {
1384 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1385 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1386
1387 ASSERT_RTNL();
1388
1389 if (!in_dev) {
1390 if (event == NETDEV_REGISTER) {
1391 in_dev = inetdev_init(dev);
1392 if (IS_ERR(in_dev))
1393 return notifier_from_errno(PTR_ERR(in_dev));
1394 if (dev->flags & IFF_LOOPBACK) {
1395 IN_DEV_CONF_SET(in_dev, NOXFRM, 1);
1396 IN_DEV_CONF_SET(in_dev, NOPOLICY, 1);
1397 }
1398 } else if (event == NETDEV_CHANGEMTU) {
1399 /* Re-enabling IP */
1400 if (inetdev_valid_mtu(dev->mtu))
1401 in_dev = inetdev_init(dev);
1402 }
1403 goto out;
1404 }
1405
1406 switch (event) {
1407 case NETDEV_REGISTER:
1408 pr_debug("%s: bug\n", __func__);
1409 RCU_INIT_POINTER(dev->ip_ptr, NULL);
1410 break;
1411 case NETDEV_UP:
1412 if (!inetdev_valid_mtu(dev->mtu))
1413 break;
1414 if (dev->flags & IFF_LOOPBACK) {
1415 struct in_ifaddr *ifa = inet_alloc_ifa();
1416
1417 if (ifa) {
1418 INIT_HLIST_NODE(&ifa->hash);
1419 ifa->ifa_local =
1420 ifa->ifa_address = htonl(INADDR_LOOPBACK);
1421 ifa->ifa_prefixlen = 8;
1422 ifa->ifa_mask = inet_make_mask(8);
1423 in_dev_hold(in_dev);
1424 ifa->ifa_dev = in_dev;
1425 ifa->ifa_scope = RT_SCOPE_HOST;
1426 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1427 set_ifa_lifetime(ifa, INFINITY_LIFE_TIME,
1428 INFINITY_LIFE_TIME);
1429 ipv4_devconf_setall(in_dev);
1430 neigh_parms_data_state_setall(in_dev->arp_parms);
1431 inet_insert_ifa(ifa);
1432 }
1433 }
1434 ip_mc_up(in_dev);
1435 /* fall through */
1436 case NETDEV_CHANGEADDR:
1437 if (!IN_DEV_ARP_NOTIFY(in_dev))
1438 break;
1439 /* fall through */
1440 case NETDEV_NOTIFY_PEERS:
1441 /* Send gratuitous ARP to notify of link change */
1442 inetdev_send_gratuitous_arp(dev, in_dev);
1443 break;
1444 case NETDEV_DOWN:
1445 ip_mc_down(in_dev);
1446 break;
1447 case NETDEV_PRE_TYPE_CHANGE:
1448 ip_mc_unmap(in_dev);
1449 break;
1450 case NETDEV_POST_TYPE_CHANGE:
1451 ip_mc_remap(in_dev);
1452 break;
1453 case NETDEV_CHANGEMTU:
1454 if (inetdev_valid_mtu(dev->mtu))
1455 break;
1456 /* disable IP when MTU is not enough */
1457 case NETDEV_UNREGISTER:
1458 inetdev_destroy(in_dev);
1459 break;
1460 case NETDEV_CHANGENAME:
1461 /* Do not notify about label change, this event is
1462 * not interesting to applications using netlink.
1463 */
1464 inetdev_changename(dev, in_dev);
1465
1466 devinet_sysctl_unregister(in_dev);
1467 devinet_sysctl_register(in_dev);
1468 break;
1469 }
1470 out:
1471 return NOTIFY_DONE;
1472 }
1473
1474 static struct notifier_block ip_netdev_notifier = {
1475 .notifier_call = inetdev_event,
1476 };
1477
1478 static size_t inet_nlmsg_size(void)
1479 {
1480 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
1481 + nla_total_size(4) /* IFA_ADDRESS */
1482 + nla_total_size(4) /* IFA_LOCAL */
1483 + nla_total_size(4) /* IFA_BROADCAST */
1484 + nla_total_size(IFNAMSIZ) /* IFA_LABEL */
1485 + nla_total_size(4) /* IFA_FLAGS */
1486 + nla_total_size(sizeof(struct ifa_cacheinfo)); /* IFA_CACHEINFO */
1487 }
1488
1489 static inline u32 cstamp_delta(unsigned long cstamp)
1490 {
1491 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
1492 }
1493
1494 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
1495 unsigned long tstamp, u32 preferred, u32 valid)
1496 {
1497 struct ifa_cacheinfo ci;
1498
1499 ci.cstamp = cstamp_delta(cstamp);
1500 ci.tstamp = cstamp_delta(tstamp);
1501 ci.ifa_prefered = preferred;
1502 ci.ifa_valid = valid;
1503
1504 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
1505 }
1506
1507 static int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa,
1508 u32 portid, u32 seq, int event, unsigned int flags)
1509 {
1510 struct ifaddrmsg *ifm;
1511 struct nlmsghdr *nlh;
1512 u32 preferred, valid;
1513
1514 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*ifm), flags);
1515 if (!nlh)
1516 return -EMSGSIZE;
1517
1518 ifm = nlmsg_data(nlh);
1519 ifm->ifa_family = AF_INET;
1520 ifm->ifa_prefixlen = ifa->ifa_prefixlen;
1521 ifm->ifa_flags = ifa->ifa_flags;
1522 ifm->ifa_scope = ifa->ifa_scope;
1523 ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
1524
1525 if (!(ifm->ifa_flags & IFA_F_PERMANENT)) {
1526 preferred = ifa->ifa_preferred_lft;
1527 valid = ifa->ifa_valid_lft;
1528 if (preferred != INFINITY_LIFE_TIME) {
1529 long tval = (jiffies - ifa->ifa_tstamp) / HZ;
1530
1531 if (preferred > tval)
1532 preferred -= tval;
1533 else
1534 preferred = 0;
1535 if (valid != INFINITY_LIFE_TIME) {
1536 if (valid > tval)
1537 valid -= tval;
1538 else
1539 valid = 0;
1540 }
1541 }
1542 } else {
1543 preferred = INFINITY_LIFE_TIME;
1544 valid = INFINITY_LIFE_TIME;
1545 }
1546 if ((ifa->ifa_address &&
1547 nla_put_in_addr(skb, IFA_ADDRESS, ifa->ifa_address)) ||
1548 (ifa->ifa_local &&
1549 nla_put_in_addr(skb, IFA_LOCAL, ifa->ifa_local)) ||
1550 (ifa->ifa_broadcast &&
1551 nla_put_in_addr(skb, IFA_BROADCAST, ifa->ifa_broadcast)) ||
1552 (ifa->ifa_label[0] &&
1553 nla_put_string(skb, IFA_LABEL, ifa->ifa_label)) ||
1554 nla_put_u32(skb, IFA_FLAGS, ifa->ifa_flags) ||
1555 put_cacheinfo(skb, ifa->ifa_cstamp, ifa->ifa_tstamp,
1556 preferred, valid))
1557 goto nla_put_failure;
1558
1559 nlmsg_end(skb, nlh);
1560 return 0;
1561
1562 nla_put_failure:
1563 nlmsg_cancel(skb, nlh);
1564 return -EMSGSIZE;
1565 }
1566
1567 static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
1568 {
1569 struct net *net = sock_net(skb->sk);
1570 int h, s_h;
1571 int idx, s_idx;
1572 int ip_idx, s_ip_idx;
1573 struct net_device *dev;
1574 struct in_device *in_dev;
1575 struct in_ifaddr *ifa;
1576 struct hlist_head *head;
1577
1578 s_h = cb->args[0];
1579 s_idx = idx = cb->args[1];
1580 s_ip_idx = ip_idx = cb->args[2];
1581
1582 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1583 idx = 0;
1584 head = &net->dev_index_head[h];
1585 rcu_read_lock();
1586 cb->seq = atomic_read(&net->ipv4.dev_addr_genid) ^
1587 net->dev_base_seq;
1588 hlist_for_each_entry_rcu(dev, head, index_hlist) {
1589 if (idx < s_idx)
1590 goto cont;
1591 if (h > s_h || idx > s_idx)
1592 s_ip_idx = 0;
1593 in_dev = __in_dev_get_rcu(dev);
1594 if (!in_dev)
1595 goto cont;
1596
1597 for (ifa = in_dev->ifa_list, ip_idx = 0; ifa;
1598 ifa = ifa->ifa_next, ip_idx++) {
1599 if (ip_idx < s_ip_idx)
1600 continue;
1601 if (inet_fill_ifaddr(skb, ifa,
1602 NETLINK_CB(cb->skb).portid,
1603 cb->nlh->nlmsg_seq,
1604 RTM_NEWADDR, NLM_F_MULTI) < 0) {
1605 rcu_read_unlock();
1606 goto done;
1607 }
1608 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1609 }
1610 cont:
1611 idx++;
1612 }
1613 rcu_read_unlock();
1614 }
1615
1616 done:
1617 cb->args[0] = h;
1618 cb->args[1] = idx;
1619 cb->args[2] = ip_idx;
1620
1621 return skb->len;
1622 }
1623
1624 static void rtmsg_ifa(int event, struct in_ifaddr *ifa, struct nlmsghdr *nlh,
1625 u32 portid)
1626 {
1627 struct sk_buff *skb;
1628 u32 seq = nlh ? nlh->nlmsg_seq : 0;
1629 int err = -ENOBUFS;
1630 struct net *net;
1631
1632 net = dev_net(ifa->ifa_dev->dev);
1633 skb = nlmsg_new(inet_nlmsg_size(), GFP_KERNEL);
1634 if (!skb)
1635 goto errout;
1636
1637 err = inet_fill_ifaddr(skb, ifa, portid, seq, event, 0);
1638 if (err < 0) {
1639 /* -EMSGSIZE implies BUG in inet_nlmsg_size() */
1640 WARN_ON(err == -EMSGSIZE);
1641 kfree_skb(skb);
1642 goto errout;
1643 }
1644 rtnl_notify(skb, net, portid, RTNLGRP_IPV4_IFADDR, nlh, GFP_KERNEL);
1645 return;
1646 errout:
1647 if (err < 0)
1648 rtnl_set_sk_err(net, RTNLGRP_IPV4_IFADDR, err);
1649 }
1650
1651 static size_t inet_get_link_af_size(const struct net_device *dev,
1652 u32 ext_filter_mask)
1653 {
1654 struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr);
1655
1656 if (!in_dev)
1657 return 0;
1658
1659 return nla_total_size(IPV4_DEVCONF_MAX * 4); /* IFLA_INET_CONF */
1660 }
1661
1662 static int inet_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
1663 u32 ext_filter_mask)
1664 {
1665 struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr);
1666 struct nlattr *nla;
1667 int i;
1668
1669 if (!in_dev)
1670 return -ENODATA;
1671
1672 nla = nla_reserve(skb, IFLA_INET_CONF, IPV4_DEVCONF_MAX * 4);
1673 if (!nla)
1674 return -EMSGSIZE;
1675
1676 for (i = 0; i < IPV4_DEVCONF_MAX; i++)
1677 ((u32 *) nla_data(nla))[i] = in_dev->cnf.data[i];
1678
1679 return 0;
1680 }
1681
1682 static const struct nla_policy inet_af_policy[IFLA_INET_MAX+1] = {
1683 [IFLA_INET_CONF] = { .type = NLA_NESTED },
1684 };
1685
1686 static int inet_validate_link_af(const struct net_device *dev,
1687 const struct nlattr *nla)
1688 {
1689 struct nlattr *a, *tb[IFLA_INET_MAX+1];
1690 int err, rem;
1691
1692 if (dev && !__in_dev_get_rtnl(dev))
1693 return -EAFNOSUPPORT;
1694
1695 err = nla_parse_nested(tb, IFLA_INET_MAX, nla, inet_af_policy);
1696 if (err < 0)
1697 return err;
1698
1699 if (tb[IFLA_INET_CONF]) {
1700 nla_for_each_nested(a, tb[IFLA_INET_CONF], rem) {
1701 int cfgid = nla_type(a);
1702
1703 if (nla_len(a) < 4)
1704 return -EINVAL;
1705
1706 if (cfgid <= 0 || cfgid > IPV4_DEVCONF_MAX)
1707 return -EINVAL;
1708 }
1709 }
1710
1711 return 0;
1712 }
1713
1714 static int inet_set_link_af(struct net_device *dev, const struct nlattr *nla)
1715 {
1716 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1717 struct nlattr *a, *tb[IFLA_INET_MAX+1];
1718 int rem;
1719
1720 if (!in_dev)
1721 return -EAFNOSUPPORT;
1722
1723 if (nla_parse_nested(tb, IFLA_INET_MAX, nla, NULL) < 0)
1724 BUG();
1725
1726 if (tb[IFLA_INET_CONF]) {
1727 nla_for_each_nested(a, tb[IFLA_INET_CONF], rem)
1728 ipv4_devconf_set(in_dev, nla_type(a), nla_get_u32(a));
1729 }
1730
1731 return 0;
1732 }
1733
1734 static int inet_netconf_msgsize_devconf(int type)
1735 {
1736 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
1737 + nla_total_size(4); /* NETCONFA_IFINDEX */
1738
1739 /* type -1 is used for ALL */
1740 if (type == -1 || type == NETCONFA_FORWARDING)
1741 size += nla_total_size(4);
1742 if (type == -1 || type == NETCONFA_RP_FILTER)
1743 size += nla_total_size(4);
1744 if (type == -1 || type == NETCONFA_MC_FORWARDING)
1745 size += nla_total_size(4);
1746 if (type == -1 || type == NETCONFA_PROXY_NEIGH)
1747 size += nla_total_size(4);
1748 if (type == -1 || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
1749 size += nla_total_size(4);
1750
1751 return size;
1752 }
1753
1754 static int inet_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
1755 struct ipv4_devconf *devconf, u32 portid,
1756 u32 seq, int event, unsigned int flags,
1757 int type)
1758 {
1759 struct nlmsghdr *nlh;
1760 struct netconfmsg *ncm;
1761
1762 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
1763 flags);
1764 if (!nlh)
1765 return -EMSGSIZE;
1766
1767 ncm = nlmsg_data(nlh);
1768 ncm->ncm_family = AF_INET;
1769
1770 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
1771 goto nla_put_failure;
1772
1773 /* type -1 is used for ALL */
1774 if ((type == -1 || type == NETCONFA_FORWARDING) &&
1775 nla_put_s32(skb, NETCONFA_FORWARDING,
1776 IPV4_DEVCONF(*devconf, FORWARDING)) < 0)
1777 goto nla_put_failure;
1778 if ((type == -1 || type == NETCONFA_RP_FILTER) &&
1779 nla_put_s32(skb, NETCONFA_RP_FILTER,
1780 IPV4_DEVCONF(*devconf, RP_FILTER)) < 0)
1781 goto nla_put_failure;
1782 if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
1783 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
1784 IPV4_DEVCONF(*devconf, MC_FORWARDING)) < 0)
1785 goto nla_put_failure;
1786 if ((type == -1 || type == NETCONFA_PROXY_NEIGH) &&
1787 nla_put_s32(skb, NETCONFA_PROXY_NEIGH,
1788 IPV4_DEVCONF(*devconf, PROXY_ARP)) < 0)
1789 goto nla_put_failure;
1790 if ((type == -1 || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
1791 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
1792 IPV4_DEVCONF(*devconf, IGNORE_ROUTES_WITH_LINKDOWN)) < 0)
1793 goto nla_put_failure;
1794
1795 nlmsg_end(skb, nlh);
1796 return 0;
1797
1798 nla_put_failure:
1799 nlmsg_cancel(skb, nlh);
1800 return -EMSGSIZE;
1801 }
1802
1803 void inet_netconf_notify_devconf(struct net *net, int type, int ifindex,
1804 struct ipv4_devconf *devconf)
1805 {
1806 struct sk_buff *skb;
1807 int err = -ENOBUFS;
1808
1809 skb = nlmsg_new(inet_netconf_msgsize_devconf(type), GFP_ATOMIC);
1810 if (!skb)
1811 goto errout;
1812
1813 err = inet_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
1814 RTM_NEWNETCONF, 0, type);
1815 if (err < 0) {
1816 /* -EMSGSIZE implies BUG in inet_netconf_msgsize_devconf() */
1817 WARN_ON(err == -EMSGSIZE);
1818 kfree_skb(skb);
1819 goto errout;
1820 }
1821 rtnl_notify(skb, net, 0, RTNLGRP_IPV4_NETCONF, NULL, GFP_ATOMIC);
1822 return;
1823 errout:
1824 if (err < 0)
1825 rtnl_set_sk_err(net, RTNLGRP_IPV4_NETCONF, err);
1826 }
1827
1828 static const struct nla_policy devconf_ipv4_policy[NETCONFA_MAX+1] = {
1829 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
1830 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
1831 [NETCONFA_RP_FILTER] = { .len = sizeof(int) },
1832 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
1833 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
1834 };
1835
1836 static int inet_netconf_get_devconf(struct sk_buff *in_skb,
1837 struct nlmsghdr *nlh)
1838 {
1839 struct net *net = sock_net(in_skb->sk);
1840 struct nlattr *tb[NETCONFA_MAX+1];
1841 struct netconfmsg *ncm;
1842 struct sk_buff *skb;
1843 struct ipv4_devconf *devconf;
1844 struct in_device *in_dev;
1845 struct net_device *dev;
1846 int ifindex;
1847 int err;
1848
1849 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
1850 devconf_ipv4_policy);
1851 if (err < 0)
1852 goto errout;
1853
1854 err = -EINVAL;
1855 if (!tb[NETCONFA_IFINDEX])
1856 goto errout;
1857
1858 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
1859 switch (ifindex) {
1860 case NETCONFA_IFINDEX_ALL:
1861 devconf = net->ipv4.devconf_all;
1862 break;
1863 case NETCONFA_IFINDEX_DEFAULT:
1864 devconf = net->ipv4.devconf_dflt;
1865 break;
1866 default:
1867 dev = __dev_get_by_index(net, ifindex);
1868 if (!dev)
1869 goto errout;
1870 in_dev = __in_dev_get_rtnl(dev);
1871 if (!in_dev)
1872 goto errout;
1873 devconf = &in_dev->cnf;
1874 break;
1875 }
1876
1877 err = -ENOBUFS;
1878 skb = nlmsg_new(inet_netconf_msgsize_devconf(-1), GFP_ATOMIC);
1879 if (!skb)
1880 goto errout;
1881
1882 err = inet_netconf_fill_devconf(skb, ifindex, devconf,
1883 NETLINK_CB(in_skb).portid,
1884 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
1885 -1);
1886 if (err < 0) {
1887 /* -EMSGSIZE implies BUG in inet_netconf_msgsize_devconf() */
1888 WARN_ON(err == -EMSGSIZE);
1889 kfree_skb(skb);
1890 goto errout;
1891 }
1892 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
1893 errout:
1894 return err;
1895 }
1896
1897 static int inet_netconf_dump_devconf(struct sk_buff *skb,
1898 struct netlink_callback *cb)
1899 {
1900 struct net *net = sock_net(skb->sk);
1901 int h, s_h;
1902 int idx, s_idx;
1903 struct net_device *dev;
1904 struct in_device *in_dev;
1905 struct hlist_head *head;
1906
1907 s_h = cb->args[0];
1908 s_idx = idx = cb->args[1];
1909
1910 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1911 idx = 0;
1912 head = &net->dev_index_head[h];
1913 rcu_read_lock();
1914 cb->seq = atomic_read(&net->ipv4.dev_addr_genid) ^
1915 net->dev_base_seq;
1916 hlist_for_each_entry_rcu(dev, head, index_hlist) {
1917 if (idx < s_idx)
1918 goto cont;
1919 in_dev = __in_dev_get_rcu(dev);
1920 if (!in_dev)
1921 goto cont;
1922
1923 if (inet_netconf_fill_devconf(skb, dev->ifindex,
1924 &in_dev->cnf,
1925 NETLINK_CB(cb->skb).portid,
1926 cb->nlh->nlmsg_seq,
1927 RTM_NEWNETCONF,
1928 NLM_F_MULTI,
1929 -1) < 0) {
1930 rcu_read_unlock();
1931 goto done;
1932 }
1933 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1934 cont:
1935 idx++;
1936 }
1937 rcu_read_unlock();
1938 }
1939 if (h == NETDEV_HASHENTRIES) {
1940 if (inet_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
1941 net->ipv4.devconf_all,
1942 NETLINK_CB(cb->skb).portid,
1943 cb->nlh->nlmsg_seq,
1944 RTM_NEWNETCONF, NLM_F_MULTI,
1945 -1) < 0)
1946 goto done;
1947 else
1948 h++;
1949 }
1950 if (h == NETDEV_HASHENTRIES + 1) {
1951 if (inet_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
1952 net->ipv4.devconf_dflt,
1953 NETLINK_CB(cb->skb).portid,
1954 cb->nlh->nlmsg_seq,
1955 RTM_NEWNETCONF, NLM_F_MULTI,
1956 -1) < 0)
1957 goto done;
1958 else
1959 h++;
1960 }
1961 done:
1962 cb->args[0] = h;
1963 cb->args[1] = idx;
1964
1965 return skb->len;
1966 }
1967
1968 #ifdef CONFIG_SYSCTL
1969
1970 static void devinet_copy_dflt_conf(struct net *net, int i)
1971 {
1972 struct net_device *dev;
1973
1974 rcu_read_lock();
1975 for_each_netdev_rcu(net, dev) {
1976 struct in_device *in_dev;
1977
1978 in_dev = __in_dev_get_rcu(dev);
1979 if (in_dev && !test_bit(i, in_dev->cnf.state))
1980 in_dev->cnf.data[i] = net->ipv4.devconf_dflt->data[i];
1981 }
1982 rcu_read_unlock();
1983 }
1984
1985 /* called with RTNL locked */
1986 static void inet_forward_change(struct net *net)
1987 {
1988 struct net_device *dev;
1989 int on = IPV4_DEVCONF_ALL(net, FORWARDING);
1990
1991 IPV4_DEVCONF_ALL(net, ACCEPT_REDIRECTS) = !on;
1992 IPV4_DEVCONF_DFLT(net, FORWARDING) = on;
1993 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING,
1994 NETCONFA_IFINDEX_ALL,
1995 net->ipv4.devconf_all);
1996 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING,
1997 NETCONFA_IFINDEX_DEFAULT,
1998 net->ipv4.devconf_dflt);
1999
2000 for_each_netdev(net, dev) {
2001 struct in_device *in_dev;
2002 if (on)
2003 dev_disable_lro(dev);
2004 rcu_read_lock();
2005 in_dev = __in_dev_get_rcu(dev);
2006 if (in_dev) {
2007 IN_DEV_CONF_SET(in_dev, FORWARDING, on);
2008 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING,
2009 dev->ifindex, &in_dev->cnf);
2010 }
2011 rcu_read_unlock();
2012 }
2013 }
2014
2015 static int devinet_conf_ifindex(struct net *net, struct ipv4_devconf *cnf)
2016 {
2017 if (cnf == net->ipv4.devconf_dflt)
2018 return NETCONFA_IFINDEX_DEFAULT;
2019 else if (cnf == net->ipv4.devconf_all)
2020 return NETCONFA_IFINDEX_ALL;
2021 else {
2022 struct in_device *idev
2023 = container_of(cnf, struct in_device, cnf);
2024 return idev->dev->ifindex;
2025 }
2026 }
2027
2028 static int devinet_conf_proc(struct ctl_table *ctl, int write,
2029 void __user *buffer,
2030 size_t *lenp, loff_t *ppos)
2031 {
2032 int old_value = *(int *)ctl->data;
2033 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
2034 int new_value = *(int *)ctl->data;
2035
2036 if (write) {
2037 struct ipv4_devconf *cnf = ctl->extra1;
2038 struct net *net = ctl->extra2;
2039 int i = (int *)ctl->data - cnf->data;
2040 int ifindex;
2041
2042 set_bit(i, cnf->state);
2043
2044 if (cnf == net->ipv4.devconf_dflt)
2045 devinet_copy_dflt_conf(net, i);
2046 if (i == IPV4_DEVCONF_ACCEPT_LOCAL - 1 ||
2047 i == IPV4_DEVCONF_ROUTE_LOCALNET - 1)
2048 if ((new_value == 0) && (old_value != 0))
2049 rt_cache_flush(net);
2050
2051 if (i == IPV4_DEVCONF_RP_FILTER - 1 &&
2052 new_value != old_value) {
2053 ifindex = devinet_conf_ifindex(net, cnf);
2054 inet_netconf_notify_devconf(net, NETCONFA_RP_FILTER,
2055 ifindex, cnf);
2056 }
2057 if (i == IPV4_DEVCONF_PROXY_ARP - 1 &&
2058 new_value != old_value) {
2059 ifindex = devinet_conf_ifindex(net, cnf);
2060 inet_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
2061 ifindex, cnf);
2062 }
2063 if (i == IPV4_DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN - 1 &&
2064 new_value != old_value) {
2065 ifindex = devinet_conf_ifindex(net, cnf);
2066 inet_netconf_notify_devconf(net, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
2067 ifindex, cnf);
2068 }
2069 }
2070
2071 return ret;
2072 }
2073
2074 static int devinet_sysctl_forward(struct ctl_table *ctl, int write,
2075 void __user *buffer,
2076 size_t *lenp, loff_t *ppos)
2077 {
2078 int *valp = ctl->data;
2079 int val = *valp;
2080 loff_t pos = *ppos;
2081 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
2082
2083 if (write && *valp != val) {
2084 struct net *net = ctl->extra2;
2085
2086 if (valp != &IPV4_DEVCONF_DFLT(net, FORWARDING)) {
2087 if (!rtnl_trylock()) {
2088 /* Restore the original values before restarting */
2089 *valp = val;
2090 *ppos = pos;
2091 return restart_syscall();
2092 }
2093 if (valp == &IPV4_DEVCONF_ALL(net, FORWARDING)) {
2094 inet_forward_change(net);
2095 } else {
2096 struct ipv4_devconf *cnf = ctl->extra1;
2097 struct in_device *idev =
2098 container_of(cnf, struct in_device, cnf);
2099 if (*valp)
2100 dev_disable_lro(idev->dev);
2101 inet_netconf_notify_devconf(net,
2102 NETCONFA_FORWARDING,
2103 idev->dev->ifindex,
2104 cnf);
2105 }
2106 rtnl_unlock();
2107 rt_cache_flush(net);
2108 } else
2109 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING,
2110 NETCONFA_IFINDEX_DEFAULT,
2111 net->ipv4.devconf_dflt);
2112 }
2113
2114 return ret;
2115 }
2116
2117 static int ipv4_doint_and_flush(struct ctl_table *ctl, int write,
2118 void __user *buffer,
2119 size_t *lenp, loff_t *ppos)
2120 {
2121 int *valp = ctl->data;
2122 int val = *valp;
2123 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
2124 struct net *net = ctl->extra2;
2125
2126 if (write && *valp != val)
2127 rt_cache_flush(net);
2128
2129 return ret;
2130 }
2131
2132 #define DEVINET_SYSCTL_ENTRY(attr, name, mval, proc) \
2133 { \
2134 .procname = name, \
2135 .data = ipv4_devconf.data + \
2136 IPV4_DEVCONF_ ## attr - 1, \
2137 .maxlen = sizeof(int), \
2138 .mode = mval, \
2139 .proc_handler = proc, \
2140 .extra1 = &ipv4_devconf, \
2141 }
2142
2143 #define DEVINET_SYSCTL_RW_ENTRY(attr, name) \
2144 DEVINET_SYSCTL_ENTRY(attr, name, 0644, devinet_conf_proc)
2145
2146 #define DEVINET_SYSCTL_RO_ENTRY(attr, name) \
2147 DEVINET_SYSCTL_ENTRY(attr, name, 0444, devinet_conf_proc)
2148
2149 #define DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, proc) \
2150 DEVINET_SYSCTL_ENTRY(attr, name, 0644, proc)
2151
2152 #define DEVINET_SYSCTL_FLUSHING_ENTRY(attr, name) \
2153 DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, ipv4_doint_and_flush)
2154
2155 static struct devinet_sysctl_table {
2156 struct ctl_table_header *sysctl_header;
2157 struct ctl_table devinet_vars[__IPV4_DEVCONF_MAX];
2158 } devinet_sysctl = {
2159 .devinet_vars = {
2160 DEVINET_SYSCTL_COMPLEX_ENTRY(FORWARDING, "forwarding",
2161 devinet_sysctl_forward),
2162 DEVINET_SYSCTL_RO_ENTRY(MC_FORWARDING, "mc_forwarding"),
2163
2164 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_REDIRECTS, "accept_redirects"),
2165 DEVINET_SYSCTL_RW_ENTRY(SECURE_REDIRECTS, "secure_redirects"),
2166 DEVINET_SYSCTL_RW_ENTRY(SHARED_MEDIA, "shared_media"),
2167 DEVINET_SYSCTL_RW_ENTRY(RP_FILTER, "rp_filter"),
2168 DEVINET_SYSCTL_RW_ENTRY(SEND_REDIRECTS, "send_redirects"),
2169 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_SOURCE_ROUTE,
2170 "accept_source_route"),
2171 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_LOCAL, "accept_local"),
2172 DEVINET_SYSCTL_RW_ENTRY(SRC_VMARK, "src_valid_mark"),
2173 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP, "proxy_arp"),
2174 DEVINET_SYSCTL_RW_ENTRY(MEDIUM_ID, "medium_id"),
2175 DEVINET_SYSCTL_RW_ENTRY(BOOTP_RELAY, "bootp_relay"),
2176 DEVINET_SYSCTL_RW_ENTRY(LOG_MARTIANS, "log_martians"),
2177 DEVINET_SYSCTL_RW_ENTRY(TAG, "tag"),
2178 DEVINET_SYSCTL_RW_ENTRY(ARPFILTER, "arp_filter"),
2179 DEVINET_SYSCTL_RW_ENTRY(ARP_ANNOUNCE, "arp_announce"),
2180 DEVINET_SYSCTL_RW_ENTRY(ARP_IGNORE, "arp_ignore"),
2181 DEVINET_SYSCTL_RW_ENTRY(ARP_ACCEPT, "arp_accept"),
2182 DEVINET_SYSCTL_RW_ENTRY(ARP_NOTIFY, "arp_notify"),
2183 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP_PVLAN, "proxy_arp_pvlan"),
2184 DEVINET_SYSCTL_RW_ENTRY(FORCE_IGMP_VERSION,
2185 "force_igmp_version"),
2186 DEVINET_SYSCTL_RW_ENTRY(IGMPV2_UNSOLICITED_REPORT_INTERVAL,
2187 "igmpv2_unsolicited_report_interval"),
2188 DEVINET_SYSCTL_RW_ENTRY(IGMPV3_UNSOLICITED_REPORT_INTERVAL,
2189 "igmpv3_unsolicited_report_interval"),
2190 DEVINET_SYSCTL_RW_ENTRY(IGNORE_ROUTES_WITH_LINKDOWN,
2191 "ignore_routes_with_linkdown"),
2192
2193 DEVINET_SYSCTL_FLUSHING_ENTRY(NOXFRM, "disable_xfrm"),
2194 DEVINET_SYSCTL_FLUSHING_ENTRY(NOPOLICY, "disable_policy"),
2195 DEVINET_SYSCTL_FLUSHING_ENTRY(PROMOTE_SECONDARIES,
2196 "promote_secondaries"),
2197 DEVINET_SYSCTL_FLUSHING_ENTRY(ROUTE_LOCALNET,
2198 "route_localnet"),
2199 },
2200 };
2201
2202 static int __devinet_sysctl_register(struct net *net, char *dev_name,
2203 struct ipv4_devconf *p)
2204 {
2205 int i;
2206 struct devinet_sysctl_table *t;
2207 char path[sizeof("net/ipv4/conf/") + IFNAMSIZ];
2208
2209 t = kmemdup(&devinet_sysctl, sizeof(*t), GFP_KERNEL);
2210 if (!t)
2211 goto out;
2212
2213 for (i = 0; i < ARRAY_SIZE(t->devinet_vars) - 1; i++) {
2214 t->devinet_vars[i].data += (char *)p - (char *)&ipv4_devconf;
2215 t->devinet_vars[i].extra1 = p;
2216 t->devinet_vars[i].extra2 = net;
2217 }
2218
2219 snprintf(path, sizeof(path), "net/ipv4/conf/%s", dev_name);
2220
2221 t->sysctl_header = register_net_sysctl(net, path, t->devinet_vars);
2222 if (!t->sysctl_header)
2223 goto free;
2224
2225 p->sysctl = t;
2226 return 0;
2227
2228 free:
2229 kfree(t);
2230 out:
2231 return -ENOBUFS;
2232 }
2233
2234 static void __devinet_sysctl_unregister(struct ipv4_devconf *cnf)
2235 {
2236 struct devinet_sysctl_table *t = cnf->sysctl;
2237
2238 if (!t)
2239 return;
2240
2241 cnf->sysctl = NULL;
2242 unregister_net_sysctl_table(t->sysctl_header);
2243 kfree(t);
2244 }
2245
2246 static int devinet_sysctl_register(struct in_device *idev)
2247 {
2248 int err;
2249
2250 if (!sysctl_dev_name_is_allowed(idev->dev->name))
2251 return -EINVAL;
2252
2253 err = neigh_sysctl_register(idev->dev, idev->arp_parms, NULL);
2254 if (err)
2255 return err;
2256 err = __devinet_sysctl_register(dev_net(idev->dev), idev->dev->name,
2257 &idev->cnf);
2258 if (err)
2259 neigh_sysctl_unregister(idev->arp_parms);
2260 return err;
2261 }
2262
2263 static void devinet_sysctl_unregister(struct in_device *idev)
2264 {
2265 __devinet_sysctl_unregister(&idev->cnf);
2266 neigh_sysctl_unregister(idev->arp_parms);
2267 }
2268
2269 static struct ctl_table ctl_forward_entry[] = {
2270 {
2271 .procname = "ip_forward",
2272 .data = &ipv4_devconf.data[
2273 IPV4_DEVCONF_FORWARDING - 1],
2274 .maxlen = sizeof(int),
2275 .mode = 0644,
2276 .proc_handler = devinet_sysctl_forward,
2277 .extra1 = &ipv4_devconf,
2278 .extra2 = &init_net,
2279 },
2280 { },
2281 };
2282 #endif
2283
2284 static __net_init int devinet_init_net(struct net *net)
2285 {
2286 int err;
2287 struct ipv4_devconf *all, *dflt;
2288 #ifdef CONFIG_SYSCTL
2289 struct ctl_table *tbl = ctl_forward_entry;
2290 struct ctl_table_header *forw_hdr;
2291 #endif
2292
2293 err = -ENOMEM;
2294 all = &ipv4_devconf;
2295 dflt = &ipv4_devconf_dflt;
2296
2297 if (!net_eq(net, &init_net)) {
2298 all = kmemdup(all, sizeof(ipv4_devconf), GFP_KERNEL);
2299 if (!all)
2300 goto err_alloc_all;
2301
2302 dflt = kmemdup(dflt, sizeof(ipv4_devconf_dflt), GFP_KERNEL);
2303 if (!dflt)
2304 goto err_alloc_dflt;
2305
2306 #ifdef CONFIG_SYSCTL
2307 tbl = kmemdup(tbl, sizeof(ctl_forward_entry), GFP_KERNEL);
2308 if (!tbl)
2309 goto err_alloc_ctl;
2310
2311 tbl[0].data = &all->data[IPV4_DEVCONF_FORWARDING - 1];
2312 tbl[0].extra1 = all;
2313 tbl[0].extra2 = net;
2314 #endif
2315 }
2316
2317 #ifdef CONFIG_SYSCTL
2318 err = __devinet_sysctl_register(net, "all", all);
2319 if (err < 0)
2320 goto err_reg_all;
2321
2322 err = __devinet_sysctl_register(net, "default", dflt);
2323 if (err < 0)
2324 goto err_reg_dflt;
2325
2326 err = -ENOMEM;
2327 forw_hdr = register_net_sysctl(net, "net/ipv4", tbl);
2328 if (!forw_hdr)
2329 goto err_reg_ctl;
2330 net->ipv4.forw_hdr = forw_hdr;
2331 #endif
2332
2333 net->ipv4.devconf_all = all;
2334 net->ipv4.devconf_dflt = dflt;
2335 return 0;
2336
2337 #ifdef CONFIG_SYSCTL
2338 err_reg_ctl:
2339 __devinet_sysctl_unregister(dflt);
2340 err_reg_dflt:
2341 __devinet_sysctl_unregister(all);
2342 err_reg_all:
2343 if (tbl != ctl_forward_entry)
2344 kfree(tbl);
2345 err_alloc_ctl:
2346 #endif
2347 if (dflt != &ipv4_devconf_dflt)
2348 kfree(dflt);
2349 err_alloc_dflt:
2350 if (all != &ipv4_devconf)
2351 kfree(all);
2352 err_alloc_all:
2353 return err;
2354 }
2355
2356 static __net_exit void devinet_exit_net(struct net *net)
2357 {
2358 #ifdef CONFIG_SYSCTL
2359 struct ctl_table *tbl;
2360
2361 tbl = net->ipv4.forw_hdr->ctl_table_arg;
2362 unregister_net_sysctl_table(net->ipv4.forw_hdr);
2363 __devinet_sysctl_unregister(net->ipv4.devconf_dflt);
2364 __devinet_sysctl_unregister(net->ipv4.devconf_all);
2365 kfree(tbl);
2366 #endif
2367 kfree(net->ipv4.devconf_dflt);
2368 kfree(net->ipv4.devconf_all);
2369 }
2370
2371 static __net_initdata struct pernet_operations devinet_ops = {
2372 .init = devinet_init_net,
2373 .exit = devinet_exit_net,
2374 };
2375
2376 static struct rtnl_af_ops inet_af_ops __read_mostly = {
2377 .family = AF_INET,
2378 .fill_link_af = inet_fill_link_af,
2379 .get_link_af_size = inet_get_link_af_size,
2380 .validate_link_af = inet_validate_link_af,
2381 .set_link_af = inet_set_link_af,
2382 };
2383
2384 void __init devinet_init(void)
2385 {
2386 int i;
2387
2388 for (i = 0; i < IN4_ADDR_HSIZE; i++)
2389 INIT_HLIST_HEAD(&inet_addr_lst[i]);
2390
2391 register_pernet_subsys(&devinet_ops);
2392
2393 register_gifconf(PF_INET, inet_gifconf);
2394 register_netdevice_notifier(&ip_netdev_notifier);
2395
2396 queue_delayed_work(system_power_efficient_wq, &check_lifetime_work, 0);
2397
2398 rtnl_af_register(&inet_af_ops);
2399
2400 rtnl_register(PF_INET, RTM_NEWADDR, inet_rtm_newaddr, NULL, NULL);
2401 rtnl_register(PF_INET, RTM_DELADDR, inet_rtm_deladdr, NULL, NULL);
2402 rtnl_register(PF_INET, RTM_GETADDR, NULL, inet_dump_ifaddr, NULL);
2403 rtnl_register(PF_INET, RTM_GETNETCONF, inet_netconf_get_devconf,
2404 inet_netconf_dump_devconf, NULL);
2405 }
Linux with added FPC-III support