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5f344eb3fc25a6e3844e6fe1ae79d61c7ab04cc1
[deliverable/linux.git] / net / ipv4 / devinet.c
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(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 /* 1. Deleting primary ifaddr forces deletion all secondaries
338 * unless alias promotion is set
339 **/
340
341 if (!(ifa1->ifa_flags & IFA_F_SECONDARY)) {
342 struct in_ifaddr **ifap1 = &ifa1->ifa_next;
343
344 while ((ifa = *ifap1) != NULL) {
345 if (!(ifa->ifa_flags & IFA_F_SECONDARY) &&
346 ifa1->ifa_scope <= ifa->ifa_scope)
347 last_prim = ifa;
348
349 if (!(ifa->ifa_flags & IFA_F_SECONDARY) ||
350 ifa1->ifa_mask != ifa->ifa_mask ||
351 !inet_ifa_match(ifa1->ifa_address, ifa)) {
352 ifap1 = &ifa->ifa_next;
353 prev_prom = ifa;
354 continue;
355 }
356
357 if (!do_promote) {
358 inet_hash_remove(ifa);
359 *ifap1 = ifa->ifa_next;
360
361 rtmsg_ifa(RTM_DELADDR, ifa, nlh, portid);
362 blocking_notifier_call_chain(&inetaddr_chain,
363 NETDEV_DOWN, ifa);
364 inet_free_ifa(ifa);
365 } else {
366 promote = ifa;
367 break;
368 }
369 }
370 }
371
372 /* On promotion all secondaries from subnet are changing
373 * the primary IP, we must remove all their routes silently
374 * and later to add them back with new prefsrc. Do this
375 * while all addresses are on the device list.
376 */
377 for (ifa = promote; ifa; ifa = ifa->ifa_next) {
378 if (ifa1->ifa_mask == ifa->ifa_mask &&
379 inet_ifa_match(ifa1->ifa_address, ifa))
380 fib_del_ifaddr(ifa, ifa1);
381 }
382
383 /* 2. Unlink it */
384
385 *ifap = ifa1->ifa_next;
386 inet_hash_remove(ifa1);
387
388 /* 3. Announce address deletion */
389
390 /* Send message first, then call notifier.
391 At first sight, FIB update triggered by notifier
392 will refer to already deleted ifaddr, that could confuse
393 netlink listeners. It is not true: look, gated sees
394 that route deleted and if it still thinks that ifaddr
395 is valid, it will try to restore deleted routes... Grr.
396 So that, this order is correct.
397 */
398 rtmsg_ifa(RTM_DELADDR, ifa1, nlh, portid);
399 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa1);
400
401 if (promote) {
402 struct in_ifaddr *next_sec = promote->ifa_next;
403
404 if (prev_prom) {
405 prev_prom->ifa_next = promote->ifa_next;
406 promote->ifa_next = last_prim->ifa_next;
407 last_prim->ifa_next = promote;
408 }
409
410 promote->ifa_flags &= ~IFA_F_SECONDARY;
411 rtmsg_ifa(RTM_NEWADDR, promote, nlh, portid);
412 blocking_notifier_call_chain(&inetaddr_chain,
413 NETDEV_UP, promote);
414 for (ifa = next_sec; ifa; ifa = ifa->ifa_next) {
415 if (ifa1->ifa_mask != ifa->ifa_mask ||
416 !inet_ifa_match(ifa1->ifa_address, ifa))
417 continue;
418 fib_add_ifaddr(ifa);
419 }
420
421 }
422 if (destroy)
423 inet_free_ifa(ifa1);
424 }
425
426 static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
427 int destroy)
428 {
429 __inet_del_ifa(in_dev, ifap, destroy, NULL, 0);
430 }
431
432 static void check_lifetime(struct work_struct *work);
433
434 static DECLARE_DELAYED_WORK(check_lifetime_work, check_lifetime);
435
436 static int __inet_insert_ifa(struct in_ifaddr *ifa, struct nlmsghdr *nlh,
437 u32 portid)
438 {
439 struct in_device *in_dev = ifa->ifa_dev;
440 struct in_ifaddr *ifa1, **ifap, **last_primary;
441
442 ASSERT_RTNL();
443
444 if (!ifa->ifa_local) {
445 inet_free_ifa(ifa);
446 return 0;
447 }
448
449 ifa->ifa_flags &= ~IFA_F_SECONDARY;
450 last_primary = &in_dev->ifa_list;
451
452 for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL;
453 ifap = &ifa1->ifa_next) {
454 if (!(ifa1->ifa_flags & IFA_F_SECONDARY) &&
455 ifa->ifa_scope <= ifa1->ifa_scope)
456 last_primary = &ifa1->ifa_next;
457 if (ifa1->ifa_mask == ifa->ifa_mask &&
458 inet_ifa_match(ifa1->ifa_address, ifa)) {
459 if (ifa1->ifa_local == ifa->ifa_local) {
460 inet_free_ifa(ifa);
461 return -EEXIST;
462 }
463 if (ifa1->ifa_scope != ifa->ifa_scope) {
464 inet_free_ifa(ifa);
465 return -EINVAL;
466 }
467 ifa->ifa_flags |= IFA_F_SECONDARY;
468 }
469 }
470
471 if (!(ifa->ifa_flags & IFA_F_SECONDARY)) {
472 prandom_seed((__force u32) ifa->ifa_local);
473 ifap = last_primary;
474 }
475
476 ifa->ifa_next = *ifap;
477 *ifap = ifa;
478
479 inet_hash_insert(dev_net(in_dev->dev), ifa);
480
481 cancel_delayed_work(&check_lifetime_work);
482 queue_delayed_work(system_power_efficient_wq, &check_lifetime_work, 0);
483
484 /* Send message first, then call notifier.
485 Notifier will trigger FIB update, so that
486 listeners of netlink will know about new ifaddr */
487 rtmsg_ifa(RTM_NEWADDR, ifa, nlh, portid);
488 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa);
489
490 return 0;
491 }
492
493 static int inet_insert_ifa(struct in_ifaddr *ifa)
494 {
495 return __inet_insert_ifa(ifa, NULL, 0);
496 }
497
498 static int inet_set_ifa(struct net_device *dev, struct in_ifaddr *ifa)
499 {
500 struct in_device *in_dev = __in_dev_get_rtnl(dev);
501
502 ASSERT_RTNL();
503
504 if (!in_dev) {
505 inet_free_ifa(ifa);
506 return -ENOBUFS;
507 }
508 ipv4_devconf_setall(in_dev);
509 neigh_parms_data_state_setall(in_dev->arp_parms);
510 if (ifa->ifa_dev != in_dev) {
511 WARN_ON(ifa->ifa_dev);
512 in_dev_hold(in_dev);
513 ifa->ifa_dev = in_dev;
514 }
515 if (ipv4_is_loopback(ifa->ifa_local))
516 ifa->ifa_scope = RT_SCOPE_HOST;
517 return inet_insert_ifa(ifa);
518 }
519
520 /* Caller must hold RCU or RTNL :
521 * We dont take a reference on found in_device
522 */
523 struct in_device *inetdev_by_index(struct net *net, int ifindex)
524 {
525 struct net_device *dev;
526 struct in_device *in_dev = NULL;
527
528 rcu_read_lock();
529 dev = dev_get_by_index_rcu(net, ifindex);
530 if (dev)
531 in_dev = rcu_dereference_rtnl(dev->ip_ptr);
532 rcu_read_unlock();
533 return in_dev;
534 }
535 EXPORT_SYMBOL(inetdev_by_index);
536
537 /* Called only from RTNL semaphored context. No locks. */
538
539 struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix,
540 __be32 mask)
541 {
542 ASSERT_RTNL();
543
544 for_primary_ifa(in_dev) {
545 if (ifa->ifa_mask == mask && inet_ifa_match(prefix, ifa))
546 return ifa;
547 } endfor_ifa(in_dev);
548 return NULL;
549 }
550
551 static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
552 {
553 struct net *net = sock_net(skb->sk);
554 struct nlattr *tb[IFA_MAX+1];
555 struct in_device *in_dev;
556 struct ifaddrmsg *ifm;
557 struct in_ifaddr *ifa, **ifap;
558 int err = -EINVAL;
559
560 ASSERT_RTNL();
561
562 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy);
563 if (err < 0)
564 goto errout;
565
566 ifm = nlmsg_data(nlh);
567 in_dev = inetdev_by_index(net, ifm->ifa_index);
568 if (in_dev == NULL) {
569 err = -ENODEV;
570 goto errout;
571 }
572
573 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
574 ifap = &ifa->ifa_next) {
575 if (tb[IFA_LOCAL] &&
576 ifa->ifa_local != nla_get_be32(tb[IFA_LOCAL]))
577 continue;
578
579 if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label))
580 continue;
581
582 if (tb[IFA_ADDRESS] &&
583 (ifm->ifa_prefixlen != ifa->ifa_prefixlen ||
584 !inet_ifa_match(nla_get_be32(tb[IFA_ADDRESS]), ifa)))
585 continue;
586
587 __inet_del_ifa(in_dev, ifap, 1, nlh, NETLINK_CB(skb).portid);
588 return 0;
589 }
590
591 err = -EADDRNOTAVAIL;
592 errout:
593 return err;
594 }
595
596 #define INFINITY_LIFE_TIME 0xFFFFFFFF
597
598 static void check_lifetime(struct work_struct *work)
599 {
600 unsigned long now, next, next_sec, next_sched;
601 struct in_ifaddr *ifa;
602 struct hlist_node *n;
603 int i;
604
605 now = jiffies;
606 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
607
608 for (i = 0; i < IN4_ADDR_HSIZE; i++) {
609 bool change_needed = false;
610
611 rcu_read_lock();
612 hlist_for_each_entry_rcu(ifa, &inet_addr_lst[i], hash) {
613 unsigned long age;
614
615 if (ifa->ifa_flags & IFA_F_PERMANENT)
616 continue;
617
618 /* We try to batch several events at once. */
619 age = (now - ifa->ifa_tstamp +
620 ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
621
622 if (ifa->ifa_valid_lft != INFINITY_LIFE_TIME &&
623 age >= ifa->ifa_valid_lft) {
624 change_needed = true;
625 } else if (ifa->ifa_preferred_lft ==
626 INFINITY_LIFE_TIME) {
627 continue;
628 } else if (age >= ifa->ifa_preferred_lft) {
629 if (time_before(ifa->ifa_tstamp +
630 ifa->ifa_valid_lft * HZ, next))
631 next = ifa->ifa_tstamp +
632 ifa->ifa_valid_lft * HZ;
633
634 if (!(ifa->ifa_flags & IFA_F_DEPRECATED))
635 change_needed = true;
636 } else if (time_before(ifa->ifa_tstamp +
637 ifa->ifa_preferred_lft * HZ,
638 next)) {
639 next = ifa->ifa_tstamp +
640 ifa->ifa_preferred_lft * HZ;
641 }
642 }
643 rcu_read_unlock();
644 if (!change_needed)
645 continue;
646 rtnl_lock();
647 hlist_for_each_entry_safe(ifa, n, &inet_addr_lst[i], hash) {
648 unsigned long age;
649
650 if (ifa->ifa_flags & IFA_F_PERMANENT)
651 continue;
652
653 /* We try to batch several events at once. */
654 age = (now - ifa->ifa_tstamp +
655 ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
656
657 if (ifa->ifa_valid_lft != INFINITY_LIFE_TIME &&
658 age >= ifa->ifa_valid_lft) {
659 struct in_ifaddr **ifap;
660
661 for (ifap = &ifa->ifa_dev->ifa_list;
662 *ifap != NULL; ifap = &(*ifap)->ifa_next) {
663 if (*ifap == ifa) {
664 inet_del_ifa(ifa->ifa_dev,
665 ifap, 1);
666 break;
667 }
668 }
669 } else if (ifa->ifa_preferred_lft !=
670 INFINITY_LIFE_TIME &&
671 age >= ifa->ifa_preferred_lft &&
672 !(ifa->ifa_flags & IFA_F_DEPRECATED)) {
673 ifa->ifa_flags |= IFA_F_DEPRECATED;
674 rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0);
675 }
676 }
677 rtnl_unlock();
678 }
679
680 next_sec = round_jiffies_up(next);
681 next_sched = next;
682
683 /* If rounded timeout is accurate enough, accept it. */
684 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
685 next_sched = next_sec;
686
687 now = jiffies;
688 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
689 if (time_before(next_sched, now + ADDRCONF_TIMER_FUZZ_MAX))
690 next_sched = now + ADDRCONF_TIMER_FUZZ_MAX;
691
692 queue_delayed_work(system_power_efficient_wq, &check_lifetime_work,
693 next_sched - now);
694 }
695
696 static void set_ifa_lifetime(struct in_ifaddr *ifa, __u32 valid_lft,
697 __u32 prefered_lft)
698 {
699 unsigned long timeout;
700
701 ifa->ifa_flags &= ~(IFA_F_PERMANENT | IFA_F_DEPRECATED);
702
703 timeout = addrconf_timeout_fixup(valid_lft, HZ);
704 if (addrconf_finite_timeout(timeout))
705 ifa->ifa_valid_lft = timeout;
706 else
707 ifa->ifa_flags |= IFA_F_PERMANENT;
708
709 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
710 if (addrconf_finite_timeout(timeout)) {
711 if (timeout == 0)
712 ifa->ifa_flags |= IFA_F_DEPRECATED;
713 ifa->ifa_preferred_lft = timeout;
714 }
715 ifa->ifa_tstamp = jiffies;
716 if (!ifa->ifa_cstamp)
717 ifa->ifa_cstamp = ifa->ifa_tstamp;
718 }
719
720 static struct in_ifaddr *rtm_to_ifaddr(struct net *net, struct nlmsghdr *nlh,
721 __u32 *pvalid_lft, __u32 *pprefered_lft)
722 {
723 struct nlattr *tb[IFA_MAX+1];
724 struct in_ifaddr *ifa;
725 struct ifaddrmsg *ifm;
726 struct net_device *dev;
727 struct in_device *in_dev;
728 int err;
729
730 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy);
731 if (err < 0)
732 goto errout;
733
734 ifm = nlmsg_data(nlh);
735 err = -EINVAL;
736 if (ifm->ifa_prefixlen > 32 || tb[IFA_LOCAL] == NULL)
737 goto errout;
738
739 dev = __dev_get_by_index(net, ifm->ifa_index);
740 err = -ENODEV;
741 if (dev == NULL)
742 goto errout;
743
744 in_dev = __in_dev_get_rtnl(dev);
745 err = -ENOBUFS;
746 if (in_dev == NULL)
747 goto errout;
748
749 ifa = inet_alloc_ifa();
750 if (ifa == NULL)
751 /*
752 * A potential indev allocation can be left alive, it stays
753 * assigned to its device and is destroy with it.
754 */
755 goto errout;
756
757 ipv4_devconf_setall(in_dev);
758 neigh_parms_data_state_setall(in_dev->arp_parms);
759 in_dev_hold(in_dev);
760
761 if (tb[IFA_ADDRESS] == NULL)
762 tb[IFA_ADDRESS] = tb[IFA_LOCAL];
763
764 INIT_HLIST_NODE(&ifa->hash);
765 ifa->ifa_prefixlen = ifm->ifa_prefixlen;
766 ifa->ifa_mask = inet_make_mask(ifm->ifa_prefixlen);
767 ifa->ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) :
768 ifm->ifa_flags;
769 ifa->ifa_scope = ifm->ifa_scope;
770 ifa->ifa_dev = in_dev;
771
772 ifa->ifa_local = nla_get_be32(tb[IFA_LOCAL]);
773 ifa->ifa_address = nla_get_be32(tb[IFA_ADDRESS]);
774
775 if (tb[IFA_BROADCAST])
776 ifa->ifa_broadcast = nla_get_be32(tb[IFA_BROADCAST]);
777
778 if (tb[IFA_LABEL])
779 nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ);
780 else
781 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
782
783 if (tb[IFA_CACHEINFO]) {
784 struct ifa_cacheinfo *ci;
785
786 ci = nla_data(tb[IFA_CACHEINFO]);
787 if (!ci->ifa_valid || ci->ifa_prefered > ci->ifa_valid) {
788 err = -EINVAL;
789 goto errout_free;
790 }
791 *pvalid_lft = ci->ifa_valid;
792 *pprefered_lft = ci->ifa_prefered;
793 }
794
795 return ifa;
796
797 errout_free:
798 inet_free_ifa(ifa);
799 errout:
800 return ERR_PTR(err);
801 }
802
803 static struct in_ifaddr *find_matching_ifa(struct in_ifaddr *ifa)
804 {
805 struct in_device *in_dev = ifa->ifa_dev;
806 struct in_ifaddr *ifa1, **ifap;
807
808 if (!ifa->ifa_local)
809 return NULL;
810
811 for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL;
812 ifap = &ifa1->ifa_next) {
813 if (ifa1->ifa_mask == ifa->ifa_mask &&
814 inet_ifa_match(ifa1->ifa_address, ifa) &&
815 ifa1->ifa_local == ifa->ifa_local)
816 return ifa1;
817 }
818 return NULL;
819 }
820
821 static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
822 {
823 struct net *net = sock_net(skb->sk);
824 struct in_ifaddr *ifa;
825 struct in_ifaddr *ifa_existing;
826 __u32 valid_lft = INFINITY_LIFE_TIME;
827 __u32 prefered_lft = INFINITY_LIFE_TIME;
828
829 ASSERT_RTNL();
830
831 ifa = rtm_to_ifaddr(net, nlh, &valid_lft, &prefered_lft);
832 if (IS_ERR(ifa))
833 return PTR_ERR(ifa);
834
835 ifa_existing = find_matching_ifa(ifa);
836 if (!ifa_existing) {
837 /* It would be best to check for !NLM_F_CREATE here but
838 * userspace already relies on not having to provide this.
839 */
840 set_ifa_lifetime(ifa, valid_lft, prefered_lft);
841 return __inet_insert_ifa(ifa, nlh, NETLINK_CB(skb).portid);
842 } else {
843 inet_free_ifa(ifa);
844
845 if (nlh->nlmsg_flags & NLM_F_EXCL ||
846 !(nlh->nlmsg_flags & NLM_F_REPLACE))
847 return -EEXIST;
848 ifa = ifa_existing;
849 set_ifa_lifetime(ifa, valid_lft, prefered_lft);
850 cancel_delayed_work(&check_lifetime_work);
851 queue_delayed_work(system_power_efficient_wq,
852 &check_lifetime_work, 0);
853 rtmsg_ifa(RTM_NEWADDR, ifa, nlh, NETLINK_CB(skb).portid);
854 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa);
855 }
856 return 0;
857 }
858
859 /*
860 * Determine a default network mask, based on the IP address.
861 */
862
863 static int inet_abc_len(__be32 addr)
864 {
865 int rc = -1; /* Something else, probably a multicast. */
866
867 if (ipv4_is_zeronet(addr))
868 rc = 0;
869 else {
870 __u32 haddr = ntohl(addr);
871
872 if (IN_CLASSA(haddr))
873 rc = 8;
874 else if (IN_CLASSB(haddr))
875 rc = 16;
876 else if (IN_CLASSC(haddr))
877 rc = 24;
878 }
879
880 return rc;
881 }
882
883
884 int devinet_ioctl(struct net *net, unsigned int cmd, void __user *arg)
885 {
886 struct ifreq ifr;
887 struct sockaddr_in sin_orig;
888 struct sockaddr_in *sin = (struct sockaddr_in *)&ifr.ifr_addr;
889 struct in_device *in_dev;
890 struct in_ifaddr **ifap = NULL;
891 struct in_ifaddr *ifa = NULL;
892 struct net_device *dev;
893 char *colon;
894 int ret = -EFAULT;
895 int tryaddrmatch = 0;
896
897 /*
898 * Fetch the caller's info block into kernel space
899 */
900
901 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
902 goto out;
903 ifr.ifr_name[IFNAMSIZ - 1] = 0;
904
905 /* save original address for comparison */
906 memcpy(&sin_orig, sin, sizeof(*sin));
907
908 colon = strchr(ifr.ifr_name, ':');
909 if (colon)
910 *colon = 0;
911
912 dev_load(net, ifr.ifr_name);
913
914 switch (cmd) {
915 case SIOCGIFADDR: /* Get interface address */
916 case SIOCGIFBRDADDR: /* Get the broadcast address */
917 case SIOCGIFDSTADDR: /* Get the destination address */
918 case SIOCGIFNETMASK: /* Get the netmask for the interface */
919 /* Note that these ioctls will not sleep,
920 so that we do not impose a lock.
921 One day we will be forced to put shlock here (I mean SMP)
922 */
923 tryaddrmatch = (sin_orig.sin_family == AF_INET);
924 memset(sin, 0, sizeof(*sin));
925 sin->sin_family = AF_INET;
926 break;
927
928 case SIOCSIFFLAGS:
929 ret = -EPERM;
930 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
931 goto out;
932 break;
933 case SIOCSIFADDR: /* Set interface address (and family) */
934 case SIOCSIFBRDADDR: /* Set the broadcast address */
935 case SIOCSIFDSTADDR: /* Set the destination address */
936 case SIOCSIFNETMASK: /* Set the netmask for the interface */
937 ret = -EPERM;
938 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
939 goto out;
940 ret = -EINVAL;
941 if (sin->sin_family != AF_INET)
942 goto out;
943 break;
944 default:
945 ret = -EINVAL;
946 goto out;
947 }
948
949 rtnl_lock();
950
951 ret = -ENODEV;
952 dev = __dev_get_by_name(net, ifr.ifr_name);
953 if (!dev)
954 goto done;
955
956 if (colon)
957 *colon = ':';
958
959 in_dev = __in_dev_get_rtnl(dev);
960 if (in_dev) {
961 if (tryaddrmatch) {
962 /* Matthias Andree */
963 /* compare label and address (4.4BSD style) */
964 /* note: we only do this for a limited set of ioctls
965 and only if the original address family was AF_INET.
966 This is checked above. */
967 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
968 ifap = &ifa->ifa_next) {
969 if (!strcmp(ifr.ifr_name, ifa->ifa_label) &&
970 sin_orig.sin_addr.s_addr ==
971 ifa->ifa_local) {
972 break; /* found */
973 }
974 }
975 }
976 /* we didn't get a match, maybe the application is
977 4.3BSD-style and passed in junk so we fall back to
978 comparing just the label */
979 if (!ifa) {
980 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
981 ifap = &ifa->ifa_next)
982 if (!strcmp(ifr.ifr_name, ifa->ifa_label))
983 break;
984 }
985 }
986
987 ret = -EADDRNOTAVAIL;
988 if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS)
989 goto done;
990
991 switch (cmd) {
992 case SIOCGIFADDR: /* Get interface address */
993 sin->sin_addr.s_addr = ifa->ifa_local;
994 goto rarok;
995
996 case SIOCGIFBRDADDR: /* Get the broadcast address */
997 sin->sin_addr.s_addr = ifa->ifa_broadcast;
998 goto rarok;
999
1000 case SIOCGIFDSTADDR: /* Get the destination address */
1001 sin->sin_addr.s_addr = ifa->ifa_address;
1002 goto rarok;
1003
1004 case SIOCGIFNETMASK: /* Get the netmask for the interface */
1005 sin->sin_addr.s_addr = ifa->ifa_mask;
1006 goto rarok;
1007
1008 case SIOCSIFFLAGS:
1009 if (colon) {
1010 ret = -EADDRNOTAVAIL;
1011 if (!ifa)
1012 break;
1013 ret = 0;
1014 if (!(ifr.ifr_flags & IFF_UP))
1015 inet_del_ifa(in_dev, ifap, 1);
1016 break;
1017 }
1018 ret = dev_change_flags(dev, ifr.ifr_flags);
1019 break;
1020
1021 case SIOCSIFADDR: /* Set interface address (and family) */
1022 ret = -EINVAL;
1023 if (inet_abc_len(sin->sin_addr.s_addr) < 0)
1024 break;
1025
1026 if (!ifa) {
1027 ret = -ENOBUFS;
1028 ifa = inet_alloc_ifa();
1029 if (!ifa)
1030 break;
1031 INIT_HLIST_NODE(&ifa->hash);
1032 if (colon)
1033 memcpy(ifa->ifa_label, ifr.ifr_name, IFNAMSIZ);
1034 else
1035 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1036 } else {
1037 ret = 0;
1038 if (ifa->ifa_local == sin->sin_addr.s_addr)
1039 break;
1040 inet_del_ifa(in_dev, ifap, 0);
1041 ifa->ifa_broadcast = 0;
1042 ifa->ifa_scope = 0;
1043 }
1044
1045 ifa->ifa_address = ifa->ifa_local = sin->sin_addr.s_addr;
1046
1047 if (!(dev->flags & IFF_POINTOPOINT)) {
1048 ifa->ifa_prefixlen = inet_abc_len(ifa->ifa_address);
1049 ifa->ifa_mask = inet_make_mask(ifa->ifa_prefixlen);
1050 if ((dev->flags & IFF_BROADCAST) &&
1051 ifa->ifa_prefixlen < 31)
1052 ifa->ifa_broadcast = ifa->ifa_address |
1053 ~ifa->ifa_mask;
1054 } else {
1055 ifa->ifa_prefixlen = 32;
1056 ifa->ifa_mask = inet_make_mask(32);
1057 }
1058 set_ifa_lifetime(ifa, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1059 ret = inet_set_ifa(dev, ifa);
1060 break;
1061
1062 case SIOCSIFBRDADDR: /* Set the broadcast address */
1063 ret = 0;
1064 if (ifa->ifa_broadcast != sin->sin_addr.s_addr) {
1065 inet_del_ifa(in_dev, ifap, 0);
1066 ifa->ifa_broadcast = sin->sin_addr.s_addr;
1067 inet_insert_ifa(ifa);
1068 }
1069 break;
1070
1071 case SIOCSIFDSTADDR: /* Set the destination address */
1072 ret = 0;
1073 if (ifa->ifa_address == sin->sin_addr.s_addr)
1074 break;
1075 ret = -EINVAL;
1076 if (inet_abc_len(sin->sin_addr.s_addr) < 0)
1077 break;
1078 ret = 0;
1079 inet_del_ifa(in_dev, ifap, 0);
1080 ifa->ifa_address = sin->sin_addr.s_addr;
1081 inet_insert_ifa(ifa);
1082 break;
1083
1084 case SIOCSIFNETMASK: /* Set the netmask for the interface */
1085
1086 /*
1087 * The mask we set must be legal.
1088 */
1089 ret = -EINVAL;
1090 if (bad_mask(sin->sin_addr.s_addr, 0))
1091 break;
1092 ret = 0;
1093 if (ifa->ifa_mask != sin->sin_addr.s_addr) {
1094 __be32 old_mask = ifa->ifa_mask;
1095 inet_del_ifa(in_dev, ifap, 0);
1096 ifa->ifa_mask = sin->sin_addr.s_addr;
1097 ifa->ifa_prefixlen = inet_mask_len(ifa->ifa_mask);
1098
1099 /* See if current broadcast address matches
1100 * with current netmask, then recalculate
1101 * the broadcast address. Otherwise it's a
1102 * funny address, so don't touch it since
1103 * the user seems to know what (s)he's doing...
1104 */
1105 if ((dev->flags & IFF_BROADCAST) &&
1106 (ifa->ifa_prefixlen < 31) &&
1107 (ifa->ifa_broadcast ==
1108 (ifa->ifa_local|~old_mask))) {
1109 ifa->ifa_broadcast = (ifa->ifa_local |
1110 ~sin->sin_addr.s_addr);
1111 }
1112 inet_insert_ifa(ifa);
1113 }
1114 break;
1115 }
1116 done:
1117 rtnl_unlock();
1118 out:
1119 return ret;
1120 rarok:
1121 rtnl_unlock();
1122 ret = copy_to_user(arg, &ifr, sizeof(struct ifreq)) ? -EFAULT : 0;
1123 goto out;
1124 }
1125
1126 static int inet_gifconf(struct net_device *dev, char __user *buf, int len)
1127 {
1128 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1129 struct in_ifaddr *ifa;
1130 struct ifreq ifr;
1131 int done = 0;
1132
1133 if (!in_dev)
1134 goto out;
1135
1136 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1137 if (!buf) {
1138 done += sizeof(ifr);
1139 continue;
1140 }
1141 if (len < (int) sizeof(ifr))
1142 break;
1143 memset(&ifr, 0, sizeof(struct ifreq));
1144 strcpy(ifr.ifr_name, ifa->ifa_label);
1145
1146 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_family = AF_INET;
1147 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_addr.s_addr =
1148 ifa->ifa_local;
1149
1150 if (copy_to_user(buf, &ifr, sizeof(struct ifreq))) {
1151 done = -EFAULT;
1152 break;
1153 }
1154 buf += sizeof(struct ifreq);
1155 len -= sizeof(struct ifreq);
1156 done += sizeof(struct ifreq);
1157 }
1158 out:
1159 return done;
1160 }
1161
1162 __be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope)
1163 {
1164 __be32 addr = 0;
1165 struct in_device *in_dev;
1166 struct net *net = dev_net(dev);
1167
1168 rcu_read_lock();
1169 in_dev = __in_dev_get_rcu(dev);
1170 if (!in_dev)
1171 goto no_in_dev;
1172
1173 for_primary_ifa(in_dev) {
1174 if (ifa->ifa_scope > scope)
1175 continue;
1176 if (!dst || inet_ifa_match(dst, ifa)) {
1177 addr = ifa->ifa_local;
1178 break;
1179 }
1180 if (!addr)
1181 addr = ifa->ifa_local;
1182 } endfor_ifa(in_dev);
1183
1184 if (addr)
1185 goto out_unlock;
1186 no_in_dev:
1187
1188 /* Not loopback addresses on loopback should be preferred
1189 in this case. It is importnat that lo is the first interface
1190 in dev_base list.
1191 */
1192 for_each_netdev_rcu(net, dev) {
1193 in_dev = __in_dev_get_rcu(dev);
1194 if (!in_dev)
1195 continue;
1196
1197 for_primary_ifa(in_dev) {
1198 if (ifa->ifa_scope != RT_SCOPE_LINK &&
1199 ifa->ifa_scope <= scope) {
1200 addr = ifa->ifa_local;
1201 goto out_unlock;
1202 }
1203 } endfor_ifa(in_dev);
1204 }
1205 out_unlock:
1206 rcu_read_unlock();
1207 return addr;
1208 }
1209 EXPORT_SYMBOL(inet_select_addr);
1210
1211 static __be32 confirm_addr_indev(struct in_device *in_dev, __be32 dst,
1212 __be32 local, int scope)
1213 {
1214 int same = 0;
1215 __be32 addr = 0;
1216
1217 for_ifa(in_dev) {
1218 if (!addr &&
1219 (local == ifa->ifa_local || !local) &&
1220 ifa->ifa_scope <= scope) {
1221 addr = ifa->ifa_local;
1222 if (same)
1223 break;
1224 }
1225 if (!same) {
1226 same = (!local || inet_ifa_match(local, ifa)) &&
1227 (!dst || inet_ifa_match(dst, ifa));
1228 if (same && addr) {
1229 if (local || !dst)
1230 break;
1231 /* Is the selected addr into dst subnet? */
1232 if (inet_ifa_match(addr, ifa))
1233 break;
1234 /* No, then can we use new local src? */
1235 if (ifa->ifa_scope <= scope) {
1236 addr = ifa->ifa_local;
1237 break;
1238 }
1239 /* search for large dst subnet for addr */
1240 same = 0;
1241 }
1242 }
1243 } endfor_ifa(in_dev);
1244
1245 return same ? addr : 0;
1246 }
1247
1248 /*
1249 * Confirm that local IP address exists using wildcards:
1250 * - net: netns to check, cannot be NULL
1251 * - in_dev: only on this interface, NULL=any interface
1252 * - dst: only in the same subnet as dst, 0=any dst
1253 * - local: address, 0=autoselect the local address
1254 * - scope: maximum allowed scope value for the local address
1255 */
1256 __be32 inet_confirm_addr(struct net *net, struct in_device *in_dev,
1257 __be32 dst, __be32 local, int scope)
1258 {
1259 __be32 addr = 0;
1260 struct net_device *dev;
1261
1262 if (in_dev != NULL)
1263 return confirm_addr_indev(in_dev, dst, local, scope);
1264
1265 rcu_read_lock();
1266 for_each_netdev_rcu(net, dev) {
1267 in_dev = __in_dev_get_rcu(dev);
1268 if (in_dev) {
1269 addr = confirm_addr_indev(in_dev, dst, local, scope);
1270 if (addr)
1271 break;
1272 }
1273 }
1274 rcu_read_unlock();
1275
1276 return addr;
1277 }
1278 EXPORT_SYMBOL(inet_confirm_addr);
1279
1280 /*
1281 * Device notifier
1282 */
1283
1284 int register_inetaddr_notifier(struct notifier_block *nb)
1285 {
1286 return blocking_notifier_chain_register(&inetaddr_chain, nb);
1287 }
1288 EXPORT_SYMBOL(register_inetaddr_notifier);
1289
1290 int unregister_inetaddr_notifier(struct notifier_block *nb)
1291 {
1292 return blocking_notifier_chain_unregister(&inetaddr_chain, nb);
1293 }
1294 EXPORT_SYMBOL(unregister_inetaddr_notifier);
1295
1296 /* Rename ifa_labels for a device name change. Make some effort to preserve
1297 * existing alias numbering and to create unique labels if possible.
1298 */
1299 static void inetdev_changename(struct net_device *dev, struct in_device *in_dev)
1300 {
1301 struct in_ifaddr *ifa;
1302 int named = 0;
1303
1304 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1305 char old[IFNAMSIZ], *dot;
1306
1307 memcpy(old, ifa->ifa_label, IFNAMSIZ);
1308 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1309 if (named++ == 0)
1310 goto skip;
1311 dot = strchr(old, ':');
1312 if (dot == NULL) {
1313 sprintf(old, ":%d", named);
1314 dot = old;
1315 }
1316 if (strlen(dot) + strlen(dev->name) < IFNAMSIZ)
1317 strcat(ifa->ifa_label, dot);
1318 else
1319 strcpy(ifa->ifa_label + (IFNAMSIZ - strlen(dot) - 1), dot);
1320 skip:
1321 rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0);
1322 }
1323 }
1324
1325 static bool inetdev_valid_mtu(unsigned int mtu)
1326 {
1327 return mtu >= 68;
1328 }
1329
1330 static void inetdev_send_gratuitous_arp(struct net_device *dev,
1331 struct in_device *in_dev)
1332
1333 {
1334 struct in_ifaddr *ifa;
1335
1336 for (ifa = in_dev->ifa_list; ifa;
1337 ifa = ifa->ifa_next) {
1338 arp_send(ARPOP_REQUEST, ETH_P_ARP,
1339 ifa->ifa_local, dev,
1340 ifa->ifa_local, NULL,
1341 dev->dev_addr, NULL);
1342 }
1343 }
1344
1345 /* Called only under RTNL semaphore */
1346
1347 static int inetdev_event(struct notifier_block *this, unsigned long event,
1348 void *ptr)
1349 {
1350 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1351 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1352
1353 ASSERT_RTNL();
1354
1355 if (!in_dev) {
1356 if (event == NETDEV_REGISTER) {
1357 in_dev = inetdev_init(dev);
1358 if (IS_ERR(in_dev))
1359 return notifier_from_errno(PTR_ERR(in_dev));
1360 if (dev->flags & IFF_LOOPBACK) {
1361 IN_DEV_CONF_SET(in_dev, NOXFRM, 1);
1362 IN_DEV_CONF_SET(in_dev, NOPOLICY, 1);
1363 }
1364 } else if (event == NETDEV_CHANGEMTU) {
1365 /* Re-enabling IP */
1366 if (inetdev_valid_mtu(dev->mtu))
1367 in_dev = inetdev_init(dev);
1368 }
1369 goto out;
1370 }
1371
1372 switch (event) {
1373 case NETDEV_REGISTER:
1374 pr_debug("%s: bug\n", __func__);
1375 RCU_INIT_POINTER(dev->ip_ptr, NULL);
1376 break;
1377 case NETDEV_UP:
1378 if (!inetdev_valid_mtu(dev->mtu))
1379 break;
1380 if (dev->flags & IFF_LOOPBACK) {
1381 struct in_ifaddr *ifa = inet_alloc_ifa();
1382
1383 if (ifa) {
1384 INIT_HLIST_NODE(&ifa->hash);
1385 ifa->ifa_local =
1386 ifa->ifa_address = htonl(INADDR_LOOPBACK);
1387 ifa->ifa_prefixlen = 8;
1388 ifa->ifa_mask = inet_make_mask(8);
1389 in_dev_hold(in_dev);
1390 ifa->ifa_dev = in_dev;
1391 ifa->ifa_scope = RT_SCOPE_HOST;
1392 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1393 set_ifa_lifetime(ifa, INFINITY_LIFE_TIME,
1394 INFINITY_LIFE_TIME);
1395 ipv4_devconf_setall(in_dev);
1396 neigh_parms_data_state_setall(in_dev->arp_parms);
1397 inet_insert_ifa(ifa);
1398 }
1399 }
1400 ip_mc_up(in_dev);
1401 /* fall through */
1402 case NETDEV_CHANGEADDR:
1403 if (!IN_DEV_ARP_NOTIFY(in_dev))
1404 break;
1405 /* fall through */
1406 case NETDEV_NOTIFY_PEERS:
1407 /* Send gratuitous ARP to notify of link change */
1408 inetdev_send_gratuitous_arp(dev, in_dev);
1409 break;
1410 case NETDEV_DOWN:
1411 ip_mc_down(in_dev);
1412 break;
1413 case NETDEV_PRE_TYPE_CHANGE:
1414 ip_mc_unmap(in_dev);
1415 break;
1416 case NETDEV_POST_TYPE_CHANGE:
1417 ip_mc_remap(in_dev);
1418 break;
1419 case NETDEV_CHANGEMTU:
1420 if (inetdev_valid_mtu(dev->mtu))
1421 break;
1422 /* disable IP when MTU is not enough */
1423 case NETDEV_UNREGISTER:
1424 inetdev_destroy(in_dev);
1425 break;
1426 case NETDEV_CHANGENAME:
1427 /* Do not notify about label change, this event is
1428 * not interesting to applications using netlink.
1429 */
1430 inetdev_changename(dev, in_dev);
1431
1432 devinet_sysctl_unregister(in_dev);
1433 devinet_sysctl_register(in_dev);
1434 break;
1435 }
1436 out:
1437 return NOTIFY_DONE;
1438 }
1439
1440 static struct notifier_block ip_netdev_notifier = {
1441 .notifier_call = inetdev_event,
1442 };
1443
1444 static size_t inet_nlmsg_size(void)
1445 {
1446 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
1447 + nla_total_size(4) /* IFA_ADDRESS */
1448 + nla_total_size(4) /* IFA_LOCAL */
1449 + nla_total_size(4) /* IFA_BROADCAST */
1450 + nla_total_size(IFNAMSIZ) /* IFA_LABEL */
1451 + nla_total_size(4) /* IFA_FLAGS */
1452 + nla_total_size(sizeof(struct ifa_cacheinfo)); /* IFA_CACHEINFO */
1453 }
1454
1455 static inline u32 cstamp_delta(unsigned long cstamp)
1456 {
1457 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
1458 }
1459
1460 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
1461 unsigned long tstamp, u32 preferred, u32 valid)
1462 {
1463 struct ifa_cacheinfo ci;
1464
1465 ci.cstamp = cstamp_delta(cstamp);
1466 ci.tstamp = cstamp_delta(tstamp);
1467 ci.ifa_prefered = preferred;
1468 ci.ifa_valid = valid;
1469
1470 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
1471 }
1472
1473 static int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa,
1474 u32 portid, u32 seq, int event, unsigned int flags)
1475 {
1476 struct ifaddrmsg *ifm;
1477 struct nlmsghdr *nlh;
1478 u32 preferred, valid;
1479
1480 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*ifm), flags);
1481 if (nlh == NULL)
1482 return -EMSGSIZE;
1483
1484 ifm = nlmsg_data(nlh);
1485 ifm->ifa_family = AF_INET;
1486 ifm->ifa_prefixlen = ifa->ifa_prefixlen;
1487 ifm->ifa_flags = ifa->ifa_flags;
1488 ifm->ifa_scope = ifa->ifa_scope;
1489 ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
1490
1491 if (!(ifm->ifa_flags & IFA_F_PERMANENT)) {
1492 preferred = ifa->ifa_preferred_lft;
1493 valid = ifa->ifa_valid_lft;
1494 if (preferred != INFINITY_LIFE_TIME) {
1495 long tval = (jiffies - ifa->ifa_tstamp) / HZ;
1496
1497 if (preferred > tval)
1498 preferred -= tval;
1499 else
1500 preferred = 0;
1501 if (valid != INFINITY_LIFE_TIME) {
1502 if (valid > tval)
1503 valid -= tval;
1504 else
1505 valid = 0;
1506 }
1507 }
1508 } else {
1509 preferred = INFINITY_LIFE_TIME;
1510 valid = INFINITY_LIFE_TIME;
1511 }
1512 if ((ifa->ifa_address &&
1513 nla_put_be32(skb, IFA_ADDRESS, ifa->ifa_address)) ||
1514 (ifa->ifa_local &&
1515 nla_put_be32(skb, IFA_LOCAL, ifa->ifa_local)) ||
1516 (ifa->ifa_broadcast &&
1517 nla_put_be32(skb, IFA_BROADCAST, ifa->ifa_broadcast)) ||
1518 (ifa->ifa_label[0] &&
1519 nla_put_string(skb, IFA_LABEL, ifa->ifa_label)) ||
1520 nla_put_u32(skb, IFA_FLAGS, ifa->ifa_flags) ||
1521 put_cacheinfo(skb, ifa->ifa_cstamp, ifa->ifa_tstamp,
1522 preferred, valid))
1523 goto nla_put_failure;
1524
1525 nlmsg_end(skb, nlh);
1526 return 0;
1527
1528 nla_put_failure:
1529 nlmsg_cancel(skb, nlh);
1530 return -EMSGSIZE;
1531 }
1532
1533 static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
1534 {
1535 struct net *net = sock_net(skb->sk);
1536 int h, s_h;
1537 int idx, s_idx;
1538 int ip_idx, s_ip_idx;
1539 struct net_device *dev;
1540 struct in_device *in_dev;
1541 struct in_ifaddr *ifa;
1542 struct hlist_head *head;
1543
1544 s_h = cb->args[0];
1545 s_idx = idx = cb->args[1];
1546 s_ip_idx = ip_idx = cb->args[2];
1547
1548 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1549 idx = 0;
1550 head = &net->dev_index_head[h];
1551 rcu_read_lock();
1552 cb->seq = atomic_read(&net->ipv4.dev_addr_genid) ^
1553 net->dev_base_seq;
1554 hlist_for_each_entry_rcu(dev, head, index_hlist) {
1555 if (idx < s_idx)
1556 goto cont;
1557 if (h > s_h || idx > s_idx)
1558 s_ip_idx = 0;
1559 in_dev = __in_dev_get_rcu(dev);
1560 if (!in_dev)
1561 goto cont;
1562
1563 for (ifa = in_dev->ifa_list, ip_idx = 0; ifa;
1564 ifa = ifa->ifa_next, ip_idx++) {
1565 if (ip_idx < s_ip_idx)
1566 continue;
1567 if (inet_fill_ifaddr(skb, ifa,
1568 NETLINK_CB(cb->skb).portid,
1569 cb->nlh->nlmsg_seq,
1570 RTM_NEWADDR, NLM_F_MULTI) < 0) {
1571 rcu_read_unlock();
1572 goto done;
1573 }
1574 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1575 }
1576 cont:
1577 idx++;
1578 }
1579 rcu_read_unlock();
1580 }
1581
1582 done:
1583 cb->args[0] = h;
1584 cb->args[1] = idx;
1585 cb->args[2] = ip_idx;
1586
1587 return skb->len;
1588 }
1589
1590 static void rtmsg_ifa(int event, struct in_ifaddr *ifa, struct nlmsghdr *nlh,
1591 u32 portid)
1592 {
1593 struct sk_buff *skb;
1594 u32 seq = nlh ? nlh->nlmsg_seq : 0;
1595 int err = -ENOBUFS;
1596 struct net *net;
1597
1598 net = dev_net(ifa->ifa_dev->dev);
1599 skb = nlmsg_new(inet_nlmsg_size(), GFP_KERNEL);
1600 if (skb == NULL)
1601 goto errout;
1602
1603 err = inet_fill_ifaddr(skb, ifa, portid, seq, event, 0);
1604 if (err < 0) {
1605 /* -EMSGSIZE implies BUG in inet_nlmsg_size() */
1606 WARN_ON(err == -EMSGSIZE);
1607 kfree_skb(skb);
1608 goto errout;
1609 }
1610 rtnl_notify(skb, net, portid, RTNLGRP_IPV4_IFADDR, nlh, GFP_KERNEL);
1611 return;
1612 errout:
1613 if (err < 0)
1614 rtnl_set_sk_err(net, RTNLGRP_IPV4_IFADDR, err);
1615 }
1616
1617 static size_t inet_get_link_af_size(const struct net_device *dev)
1618 {
1619 struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr);
1620
1621 if (!in_dev)
1622 return 0;
1623
1624 return nla_total_size(IPV4_DEVCONF_MAX * 4); /* IFLA_INET_CONF */
1625 }
1626
1627 static int inet_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
1628 {
1629 struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr);
1630 struct nlattr *nla;
1631 int i;
1632
1633 if (!in_dev)
1634 return -ENODATA;
1635
1636 nla = nla_reserve(skb, IFLA_INET_CONF, IPV4_DEVCONF_MAX * 4);
1637 if (nla == NULL)
1638 return -EMSGSIZE;
1639
1640 for (i = 0; i < IPV4_DEVCONF_MAX; i++)
1641 ((u32 *) nla_data(nla))[i] = in_dev->cnf.data[i];
1642
1643 return 0;
1644 }
1645
1646 static const struct nla_policy inet_af_policy[IFLA_INET_MAX+1] = {
1647 [IFLA_INET_CONF] = { .type = NLA_NESTED },
1648 };
1649
1650 static int inet_validate_link_af(const struct net_device *dev,
1651 const struct nlattr *nla)
1652 {
1653 struct nlattr *a, *tb[IFLA_INET_MAX+1];
1654 int err, rem;
1655
1656 if (dev && !__in_dev_get_rtnl(dev))
1657 return -EAFNOSUPPORT;
1658
1659 err = nla_parse_nested(tb, IFLA_INET_MAX, nla, inet_af_policy);
1660 if (err < 0)
1661 return err;
1662
1663 if (tb[IFLA_INET_CONF]) {
1664 nla_for_each_nested(a, tb[IFLA_INET_CONF], rem) {
1665 int cfgid = nla_type(a);
1666
1667 if (nla_len(a) < 4)
1668 return -EINVAL;
1669
1670 if (cfgid <= 0 || cfgid > IPV4_DEVCONF_MAX)
1671 return -EINVAL;
1672 }
1673 }
1674
1675 return 0;
1676 }
1677
1678 static int inet_set_link_af(struct net_device *dev, const struct nlattr *nla)
1679 {
1680 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1681 struct nlattr *a, *tb[IFLA_INET_MAX+1];
1682 int rem;
1683
1684 if (!in_dev)
1685 return -EAFNOSUPPORT;
1686
1687 if (nla_parse_nested(tb, IFLA_INET_MAX, nla, NULL) < 0)
1688 BUG();
1689
1690 if (tb[IFLA_INET_CONF]) {
1691 nla_for_each_nested(a, tb[IFLA_INET_CONF], rem)
1692 ipv4_devconf_set(in_dev, nla_type(a), nla_get_u32(a));
1693 }
1694
1695 return 0;
1696 }
1697
1698 static int inet_netconf_msgsize_devconf(int type)
1699 {
1700 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
1701 + nla_total_size(4); /* NETCONFA_IFINDEX */
1702
1703 /* type -1 is used for ALL */
1704 if (type == -1 || type == NETCONFA_FORWARDING)
1705 size += nla_total_size(4);
1706 if (type == -1 || type == NETCONFA_RP_FILTER)
1707 size += nla_total_size(4);
1708 if (type == -1 || type == NETCONFA_MC_FORWARDING)
1709 size += nla_total_size(4);
1710 if (type == -1 || type == NETCONFA_PROXY_NEIGH)
1711 size += nla_total_size(4);
1712
1713 return size;
1714 }
1715
1716 static int inet_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
1717 struct ipv4_devconf *devconf, u32 portid,
1718 u32 seq, int event, unsigned int flags,
1719 int type)
1720 {
1721 struct nlmsghdr *nlh;
1722 struct netconfmsg *ncm;
1723
1724 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
1725 flags);
1726 if (nlh == NULL)
1727 return -EMSGSIZE;
1728
1729 ncm = nlmsg_data(nlh);
1730 ncm->ncm_family = AF_INET;
1731
1732 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
1733 goto nla_put_failure;
1734
1735 /* type -1 is used for ALL */
1736 if ((type == -1 || type == NETCONFA_FORWARDING) &&
1737 nla_put_s32(skb, NETCONFA_FORWARDING,
1738 IPV4_DEVCONF(*devconf, FORWARDING)) < 0)
1739 goto nla_put_failure;
1740 if ((type == -1 || type == NETCONFA_RP_FILTER) &&
1741 nla_put_s32(skb, NETCONFA_RP_FILTER,
1742 IPV4_DEVCONF(*devconf, RP_FILTER)) < 0)
1743 goto nla_put_failure;
1744 if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
1745 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
1746 IPV4_DEVCONF(*devconf, MC_FORWARDING)) < 0)
1747 goto nla_put_failure;
1748 if ((type == -1 || type == NETCONFA_PROXY_NEIGH) &&
1749 nla_put_s32(skb, NETCONFA_PROXY_NEIGH,
1750 IPV4_DEVCONF(*devconf, PROXY_ARP)) < 0)
1751 goto nla_put_failure;
1752
1753 nlmsg_end(skb, nlh);
1754 return 0;
1755
1756 nla_put_failure:
1757 nlmsg_cancel(skb, nlh);
1758 return -EMSGSIZE;
1759 }
1760
1761 void inet_netconf_notify_devconf(struct net *net, int type, int ifindex,
1762 struct ipv4_devconf *devconf)
1763 {
1764 struct sk_buff *skb;
1765 int err = -ENOBUFS;
1766
1767 skb = nlmsg_new(inet_netconf_msgsize_devconf(type), GFP_ATOMIC);
1768 if (skb == NULL)
1769 goto errout;
1770
1771 err = inet_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
1772 RTM_NEWNETCONF, 0, type);
1773 if (err < 0) {
1774 /* -EMSGSIZE implies BUG in inet_netconf_msgsize_devconf() */
1775 WARN_ON(err == -EMSGSIZE);
1776 kfree_skb(skb);
1777 goto errout;
1778 }
1779 rtnl_notify(skb, net, 0, RTNLGRP_IPV4_NETCONF, NULL, GFP_ATOMIC);
1780 return;
1781 errout:
1782 if (err < 0)
1783 rtnl_set_sk_err(net, RTNLGRP_IPV4_NETCONF, err);
1784 }
1785
1786 static const struct nla_policy devconf_ipv4_policy[NETCONFA_MAX+1] = {
1787 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
1788 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
1789 [NETCONFA_RP_FILTER] = { .len = sizeof(int) },
1790 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
1791 };
1792
1793 static int inet_netconf_get_devconf(struct sk_buff *in_skb,
1794 struct nlmsghdr *nlh)
1795 {
1796 struct net *net = sock_net(in_skb->sk);
1797 struct nlattr *tb[NETCONFA_MAX+1];
1798 struct netconfmsg *ncm;
1799 struct sk_buff *skb;
1800 struct ipv4_devconf *devconf;
1801 struct in_device *in_dev;
1802 struct net_device *dev;
1803 int ifindex;
1804 int err;
1805
1806 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
1807 devconf_ipv4_policy);
1808 if (err < 0)
1809 goto errout;
1810
1811 err = EINVAL;
1812 if (!tb[NETCONFA_IFINDEX])
1813 goto errout;
1814
1815 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
1816 switch (ifindex) {
1817 case NETCONFA_IFINDEX_ALL:
1818 devconf = net->ipv4.devconf_all;
1819 break;
1820 case NETCONFA_IFINDEX_DEFAULT:
1821 devconf = net->ipv4.devconf_dflt;
1822 break;
1823 default:
1824 dev = __dev_get_by_index(net, ifindex);
1825 if (dev == NULL)
1826 goto errout;
1827 in_dev = __in_dev_get_rtnl(dev);
1828 if (in_dev == NULL)
1829 goto errout;
1830 devconf = &in_dev->cnf;
1831 break;
1832 }
1833
1834 err = -ENOBUFS;
1835 skb = nlmsg_new(inet_netconf_msgsize_devconf(-1), GFP_ATOMIC);
1836 if (skb == NULL)
1837 goto errout;
1838
1839 err = inet_netconf_fill_devconf(skb, ifindex, devconf,
1840 NETLINK_CB(in_skb).portid,
1841 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
1842 -1);
1843 if (err < 0) {
1844 /* -EMSGSIZE implies BUG in inet_netconf_msgsize_devconf() */
1845 WARN_ON(err == -EMSGSIZE);
1846 kfree_skb(skb);
1847 goto errout;
1848 }
1849 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
1850 errout:
1851 return err;
1852 }
1853
1854 static int inet_netconf_dump_devconf(struct sk_buff *skb,
1855 struct netlink_callback *cb)
1856 {
1857 struct net *net = sock_net(skb->sk);
1858 int h, s_h;
1859 int idx, s_idx;
1860 struct net_device *dev;
1861 struct in_device *in_dev;
1862 struct hlist_head *head;
1863
1864 s_h = cb->args[0];
1865 s_idx = idx = cb->args[1];
1866
1867 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1868 idx = 0;
1869 head = &net->dev_index_head[h];
1870 rcu_read_lock();
1871 cb->seq = atomic_read(&net->ipv4.dev_addr_genid) ^
1872 net->dev_base_seq;
1873 hlist_for_each_entry_rcu(dev, head, index_hlist) {
1874 if (idx < s_idx)
1875 goto cont;
1876 in_dev = __in_dev_get_rcu(dev);
1877 if (!in_dev)
1878 goto cont;
1879
1880 if (inet_netconf_fill_devconf(skb, dev->ifindex,
1881 &in_dev->cnf,
1882 NETLINK_CB(cb->skb).portid,
1883 cb->nlh->nlmsg_seq,
1884 RTM_NEWNETCONF,
1885 NLM_F_MULTI,
1886 -1) <= 0) {
1887 rcu_read_unlock();
1888 goto done;
1889 }
1890 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1891 cont:
1892 idx++;
1893 }
1894 rcu_read_unlock();
1895 }
1896 if (h == NETDEV_HASHENTRIES) {
1897 if (inet_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
1898 net->ipv4.devconf_all,
1899 NETLINK_CB(cb->skb).portid,
1900 cb->nlh->nlmsg_seq,
1901 RTM_NEWNETCONF, NLM_F_MULTI,
1902 -1) <= 0)
1903 goto done;
1904 else
1905 h++;
1906 }
1907 if (h == NETDEV_HASHENTRIES + 1) {
1908 if (inet_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
1909 net->ipv4.devconf_dflt,
1910 NETLINK_CB(cb->skb).portid,
1911 cb->nlh->nlmsg_seq,
1912 RTM_NEWNETCONF, NLM_F_MULTI,
1913 -1) <= 0)
1914 goto done;
1915 else
1916 h++;
1917 }
1918 done:
1919 cb->args[0] = h;
1920 cb->args[1] = idx;
1921
1922 return skb->len;
1923 }
1924
1925 #ifdef CONFIG_SYSCTL
1926
1927 static void devinet_copy_dflt_conf(struct net *net, int i)
1928 {
1929 struct net_device *dev;
1930
1931 rcu_read_lock();
1932 for_each_netdev_rcu(net, dev) {
1933 struct in_device *in_dev;
1934
1935 in_dev = __in_dev_get_rcu(dev);
1936 if (in_dev && !test_bit(i, in_dev->cnf.state))
1937 in_dev->cnf.data[i] = net->ipv4.devconf_dflt->data[i];
1938 }
1939 rcu_read_unlock();
1940 }
1941
1942 /* called with RTNL locked */
1943 static void inet_forward_change(struct net *net)
1944 {
1945 struct net_device *dev;
1946 int on = IPV4_DEVCONF_ALL(net, FORWARDING);
1947
1948 IPV4_DEVCONF_ALL(net, ACCEPT_REDIRECTS) = !on;
1949 IPV4_DEVCONF_DFLT(net, FORWARDING) = on;
1950 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING,
1951 NETCONFA_IFINDEX_ALL,
1952 net->ipv4.devconf_all);
1953 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING,
1954 NETCONFA_IFINDEX_DEFAULT,
1955 net->ipv4.devconf_dflt);
1956
1957 for_each_netdev(net, dev) {
1958 struct in_device *in_dev;
1959 if (on)
1960 dev_disable_lro(dev);
1961 rcu_read_lock();
1962 in_dev = __in_dev_get_rcu(dev);
1963 if (in_dev) {
1964 IN_DEV_CONF_SET(in_dev, FORWARDING, on);
1965 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING,
1966 dev->ifindex, &in_dev->cnf);
1967 }
1968 rcu_read_unlock();
1969 }
1970 }
1971
1972 static int devinet_conf_ifindex(struct net *net, struct ipv4_devconf *cnf)
1973 {
1974 if (cnf == net->ipv4.devconf_dflt)
1975 return NETCONFA_IFINDEX_DEFAULT;
1976 else if (cnf == net->ipv4.devconf_all)
1977 return NETCONFA_IFINDEX_ALL;
1978 else {
1979 struct in_device *idev
1980 = container_of(cnf, struct in_device, cnf);
1981 return idev->dev->ifindex;
1982 }
1983 }
1984
1985 static int devinet_conf_proc(struct ctl_table *ctl, int write,
1986 void __user *buffer,
1987 size_t *lenp, loff_t *ppos)
1988 {
1989 int old_value = *(int *)ctl->data;
1990 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
1991 int new_value = *(int *)ctl->data;
1992
1993 if (write) {
1994 struct ipv4_devconf *cnf = ctl->extra1;
1995 struct net *net = ctl->extra2;
1996 int i = (int *)ctl->data - cnf->data;
1997 int ifindex;
1998
1999 set_bit(i, cnf->state);
2000
2001 if (cnf == net->ipv4.devconf_dflt)
2002 devinet_copy_dflt_conf(net, i);
2003 if (i == IPV4_DEVCONF_ACCEPT_LOCAL - 1 ||
2004 i == IPV4_DEVCONF_ROUTE_LOCALNET - 1)
2005 if ((new_value == 0) && (old_value != 0))
2006 rt_cache_flush(net);
2007
2008 if (i == IPV4_DEVCONF_RP_FILTER - 1 &&
2009 new_value != old_value) {
2010 ifindex = devinet_conf_ifindex(net, cnf);
2011 inet_netconf_notify_devconf(net, NETCONFA_RP_FILTER,
2012 ifindex, cnf);
2013 }
2014 if (i == IPV4_DEVCONF_PROXY_ARP - 1 &&
2015 new_value != old_value) {
2016 ifindex = devinet_conf_ifindex(net, cnf);
2017 inet_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
2018 ifindex, cnf);
2019 }
2020 }
2021
2022 return ret;
2023 }
2024
2025 static int devinet_sysctl_forward(struct ctl_table *ctl, int write,
2026 void __user *buffer,
2027 size_t *lenp, loff_t *ppos)
2028 {
2029 int *valp = ctl->data;
2030 int val = *valp;
2031 loff_t pos = *ppos;
2032 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
2033
2034 if (write && *valp != val) {
2035 struct net *net = ctl->extra2;
2036
2037 if (valp != &IPV4_DEVCONF_DFLT(net, FORWARDING)) {
2038 if (!rtnl_trylock()) {
2039 /* Restore the original values before restarting */
2040 *valp = val;
2041 *ppos = pos;
2042 return restart_syscall();
2043 }
2044 if (valp == &IPV4_DEVCONF_ALL(net, FORWARDING)) {
2045 inet_forward_change(net);
2046 } else {
2047 struct ipv4_devconf *cnf = ctl->extra1;
2048 struct in_device *idev =
2049 container_of(cnf, struct in_device, cnf);
2050 if (*valp)
2051 dev_disable_lro(idev->dev);
2052 inet_netconf_notify_devconf(net,
2053 NETCONFA_FORWARDING,
2054 idev->dev->ifindex,
2055 cnf);
2056 }
2057 rtnl_unlock();
2058 rt_cache_flush(net);
2059 } else
2060 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING,
2061 NETCONFA_IFINDEX_DEFAULT,
2062 net->ipv4.devconf_dflt);
2063 }
2064
2065 return ret;
2066 }
2067
2068 static int ipv4_doint_and_flush(struct ctl_table *ctl, int write,
2069 void __user *buffer,
2070 size_t *lenp, loff_t *ppos)
2071 {
2072 int *valp = ctl->data;
2073 int val = *valp;
2074 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
2075 struct net *net = ctl->extra2;
2076
2077 if (write && *valp != val)
2078 rt_cache_flush(net);
2079
2080 return ret;
2081 }
2082
2083 #define DEVINET_SYSCTL_ENTRY(attr, name, mval, proc) \
2084 { \
2085 .procname = name, \
2086 .data = ipv4_devconf.data + \
2087 IPV4_DEVCONF_ ## attr - 1, \
2088 .maxlen = sizeof(int), \
2089 .mode = mval, \
2090 .proc_handler = proc, \
2091 .extra1 = &ipv4_devconf, \
2092 }
2093
2094 #define DEVINET_SYSCTL_RW_ENTRY(attr, name) \
2095 DEVINET_SYSCTL_ENTRY(attr, name, 0644, devinet_conf_proc)
2096
2097 #define DEVINET_SYSCTL_RO_ENTRY(attr, name) \
2098 DEVINET_SYSCTL_ENTRY(attr, name, 0444, devinet_conf_proc)
2099
2100 #define DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, proc) \
2101 DEVINET_SYSCTL_ENTRY(attr, name, 0644, proc)
2102
2103 #define DEVINET_SYSCTL_FLUSHING_ENTRY(attr, name) \
2104 DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, ipv4_doint_and_flush)
2105
2106 static struct devinet_sysctl_table {
2107 struct ctl_table_header *sysctl_header;
2108 struct ctl_table devinet_vars[__IPV4_DEVCONF_MAX];
2109 } devinet_sysctl = {
2110 .devinet_vars = {
2111 DEVINET_SYSCTL_COMPLEX_ENTRY(FORWARDING, "forwarding",
2112 devinet_sysctl_forward),
2113 DEVINET_SYSCTL_RO_ENTRY(MC_FORWARDING, "mc_forwarding"),
2114
2115 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_REDIRECTS, "accept_redirects"),
2116 DEVINET_SYSCTL_RW_ENTRY(SECURE_REDIRECTS, "secure_redirects"),
2117 DEVINET_SYSCTL_RW_ENTRY(SHARED_MEDIA, "shared_media"),
2118 DEVINET_SYSCTL_RW_ENTRY(RP_FILTER, "rp_filter"),
2119 DEVINET_SYSCTL_RW_ENTRY(SEND_REDIRECTS, "send_redirects"),
2120 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_SOURCE_ROUTE,
2121 "accept_source_route"),
2122 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_LOCAL, "accept_local"),
2123 DEVINET_SYSCTL_RW_ENTRY(SRC_VMARK, "src_valid_mark"),
2124 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP, "proxy_arp"),
2125 DEVINET_SYSCTL_RW_ENTRY(MEDIUM_ID, "medium_id"),
2126 DEVINET_SYSCTL_RW_ENTRY(BOOTP_RELAY, "bootp_relay"),
2127 DEVINET_SYSCTL_RW_ENTRY(LOG_MARTIANS, "log_martians"),
2128 DEVINET_SYSCTL_RW_ENTRY(TAG, "tag"),
2129 DEVINET_SYSCTL_RW_ENTRY(ARPFILTER, "arp_filter"),
2130 DEVINET_SYSCTL_RW_ENTRY(ARP_ANNOUNCE, "arp_announce"),
2131 DEVINET_SYSCTL_RW_ENTRY(ARP_IGNORE, "arp_ignore"),
2132 DEVINET_SYSCTL_RW_ENTRY(ARP_ACCEPT, "arp_accept"),
2133 DEVINET_SYSCTL_RW_ENTRY(ARP_NOTIFY, "arp_notify"),
2134 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP_PVLAN, "proxy_arp_pvlan"),
2135 DEVINET_SYSCTL_RW_ENTRY(FORCE_IGMP_VERSION,
2136 "force_igmp_version"),
2137 DEVINET_SYSCTL_RW_ENTRY(IGMPV2_UNSOLICITED_REPORT_INTERVAL,
2138 "igmpv2_unsolicited_report_interval"),
2139 DEVINET_SYSCTL_RW_ENTRY(IGMPV3_UNSOLICITED_REPORT_INTERVAL,
2140 "igmpv3_unsolicited_report_interval"),
2141
2142 DEVINET_SYSCTL_FLUSHING_ENTRY(NOXFRM, "disable_xfrm"),
2143 DEVINET_SYSCTL_FLUSHING_ENTRY(NOPOLICY, "disable_policy"),
2144 DEVINET_SYSCTL_FLUSHING_ENTRY(PROMOTE_SECONDARIES,
2145 "promote_secondaries"),
2146 DEVINET_SYSCTL_FLUSHING_ENTRY(ROUTE_LOCALNET,
2147 "route_localnet"),
2148 },
2149 };
2150
2151 static int __devinet_sysctl_register(struct net *net, char *dev_name,
2152 struct ipv4_devconf *p)
2153 {
2154 int i;
2155 struct devinet_sysctl_table *t;
2156 char path[sizeof("net/ipv4/conf/") + IFNAMSIZ];
2157
2158 t = kmemdup(&devinet_sysctl, sizeof(*t), GFP_KERNEL);
2159 if (!t)
2160 goto out;
2161
2162 for (i = 0; i < ARRAY_SIZE(t->devinet_vars) - 1; i++) {
2163 t->devinet_vars[i].data += (char *)p - (char *)&ipv4_devconf;
2164 t->devinet_vars[i].extra1 = p;
2165 t->devinet_vars[i].extra2 = net;
2166 }
2167
2168 snprintf(path, sizeof(path), "net/ipv4/conf/%s", dev_name);
2169
2170 t->sysctl_header = register_net_sysctl(net, path, t->devinet_vars);
2171 if (!t->sysctl_header)
2172 goto free;
2173
2174 p->sysctl = t;
2175 return 0;
2176
2177 free:
2178 kfree(t);
2179 out:
2180 return -ENOBUFS;
2181 }
2182
2183 static void __devinet_sysctl_unregister(struct ipv4_devconf *cnf)
2184 {
2185 struct devinet_sysctl_table *t = cnf->sysctl;
2186
2187 if (t == NULL)
2188 return;
2189
2190 cnf->sysctl = NULL;
2191 unregister_net_sysctl_table(t->sysctl_header);
2192 kfree(t);
2193 }
2194
2195 static int devinet_sysctl_register(struct in_device *idev)
2196 {
2197 int err;
2198
2199 if (!sysctl_dev_name_is_allowed(idev->dev->name))
2200 return -EINVAL;
2201
2202 err = neigh_sysctl_register(idev->dev, idev->arp_parms, NULL);
2203 if (err)
2204 return err;
2205 err = __devinet_sysctl_register(dev_net(idev->dev), idev->dev->name,
2206 &idev->cnf);
2207 if (err)
2208 neigh_sysctl_unregister(idev->arp_parms);
2209 return err;
2210 }
2211
2212 static void devinet_sysctl_unregister(struct in_device *idev)
2213 {
2214 __devinet_sysctl_unregister(&idev->cnf);
2215 neigh_sysctl_unregister(idev->arp_parms);
2216 }
2217
2218 static struct ctl_table ctl_forward_entry[] = {
2219 {
2220 .procname = "ip_forward",
2221 .data = &ipv4_devconf.data[
2222 IPV4_DEVCONF_FORWARDING - 1],
2223 .maxlen = sizeof(int),
2224 .mode = 0644,
2225 .proc_handler = devinet_sysctl_forward,
2226 .extra1 = &ipv4_devconf,
2227 .extra2 = &init_net,
2228 },
2229 { },
2230 };
2231 #endif
2232
2233 static __net_init int devinet_init_net(struct net *net)
2234 {
2235 int err;
2236 struct ipv4_devconf *all, *dflt;
2237 #ifdef CONFIG_SYSCTL
2238 struct ctl_table *tbl = ctl_forward_entry;
2239 struct ctl_table_header *forw_hdr;
2240 #endif
2241
2242 err = -ENOMEM;
2243 all = &ipv4_devconf;
2244 dflt = &ipv4_devconf_dflt;
2245
2246 if (!net_eq(net, &init_net)) {
2247 all = kmemdup(all, sizeof(ipv4_devconf), GFP_KERNEL);
2248 if (all == NULL)
2249 goto err_alloc_all;
2250
2251 dflt = kmemdup(dflt, sizeof(ipv4_devconf_dflt), GFP_KERNEL);
2252 if (dflt == NULL)
2253 goto err_alloc_dflt;
2254
2255 #ifdef CONFIG_SYSCTL
2256 tbl = kmemdup(tbl, sizeof(ctl_forward_entry), GFP_KERNEL);
2257 if (tbl == NULL)
2258 goto err_alloc_ctl;
2259
2260 tbl[0].data = &all->data[IPV4_DEVCONF_FORWARDING - 1];
2261 tbl[0].extra1 = all;
2262 tbl[0].extra2 = net;
2263 #endif
2264 }
2265
2266 #ifdef CONFIG_SYSCTL
2267 err = __devinet_sysctl_register(net, "all", all);
2268 if (err < 0)
2269 goto err_reg_all;
2270
2271 err = __devinet_sysctl_register(net, "default", dflt);
2272 if (err < 0)
2273 goto err_reg_dflt;
2274
2275 err = -ENOMEM;
2276 forw_hdr = register_net_sysctl(net, "net/ipv4", tbl);
2277 if (forw_hdr == NULL)
2278 goto err_reg_ctl;
2279 net->ipv4.forw_hdr = forw_hdr;
2280 #endif
2281
2282 net->ipv4.devconf_all = all;
2283 net->ipv4.devconf_dflt = dflt;
2284 return 0;
2285
2286 #ifdef CONFIG_SYSCTL
2287 err_reg_ctl:
2288 __devinet_sysctl_unregister(dflt);
2289 err_reg_dflt:
2290 __devinet_sysctl_unregister(all);
2291 err_reg_all:
2292 if (tbl != ctl_forward_entry)
2293 kfree(tbl);
2294 err_alloc_ctl:
2295 #endif
2296 if (dflt != &ipv4_devconf_dflt)
2297 kfree(dflt);
2298 err_alloc_dflt:
2299 if (all != &ipv4_devconf)
2300 kfree(all);
2301 err_alloc_all:
2302 return err;
2303 }
2304
2305 static __net_exit void devinet_exit_net(struct net *net)
2306 {
2307 #ifdef CONFIG_SYSCTL
2308 struct ctl_table *tbl;
2309
2310 tbl = net->ipv4.forw_hdr->ctl_table_arg;
2311 unregister_net_sysctl_table(net->ipv4.forw_hdr);
2312 __devinet_sysctl_unregister(net->ipv4.devconf_dflt);
2313 __devinet_sysctl_unregister(net->ipv4.devconf_all);
2314 kfree(tbl);
2315 #endif
2316 kfree(net->ipv4.devconf_dflt);
2317 kfree(net->ipv4.devconf_all);
2318 }
2319
2320 static __net_initdata struct pernet_operations devinet_ops = {
2321 .init = devinet_init_net,
2322 .exit = devinet_exit_net,
2323 };
2324
2325 static struct rtnl_af_ops inet_af_ops = {
2326 .family = AF_INET,
2327 .fill_link_af = inet_fill_link_af,
2328 .get_link_af_size = inet_get_link_af_size,
2329 .validate_link_af = inet_validate_link_af,
2330 .set_link_af = inet_set_link_af,
2331 };
2332
2333 void __init devinet_init(void)
2334 {
2335 int i;
2336
2337 for (i = 0; i < IN4_ADDR_HSIZE; i++)
2338 INIT_HLIST_HEAD(&inet_addr_lst[i]);
2339
2340 register_pernet_subsys(&devinet_ops);
2341
2342 register_gifconf(PF_INET, inet_gifconf);
2343 register_netdevice_notifier(&ip_netdev_notifier);
2344
2345 queue_delayed_work(system_power_efficient_wq, &check_lifetime_work, 0);
2346
2347 rtnl_af_register(&inet_af_ops);
2348
2349 rtnl_register(PF_INET, RTM_NEWADDR, inet_rtm_newaddr, NULL, NULL);
2350 rtnl_register(PF_INET, RTM_DELADDR, inet_rtm_deladdr, NULL, NULL);
2351 rtnl_register(PF_INET, RTM_GETADDR, NULL, inet_dump_ifaddr, NULL);
2352 rtnl_register(PF_INET, RTM_GETNETCONF, inet_netconf_get_devconf,
2353 inet_netconf_dump_devconf, NULL);
2354 }
2355
Linux kernel - Deliverables
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