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mfd: wm8350-i2c: Make sure the i2c regmap functions are compiled
[linux/fpc-iii.git] / net / ipv4 / devinet.c
blob6678bebb82c8a67a6db5712fd21368277affb77d
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 };
103
104 #define IN4_ADDR_HSIZE_SHIFT 8
105 #define IN4_ADDR_HSIZE (1U << IN4_ADDR_HSIZE_SHIFT)
106
107 static struct hlist_head inet_addr_lst[IN4_ADDR_HSIZE];
108 static DEFINE_SPINLOCK(inet_addr_hash_lock);
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 spin_lock(&inet_addr_hash_lock);
122 hlist_add_head_rcu(&ifa->hash, &inet_addr_lst[hash]);
123 spin_unlock(&inet_addr_hash_lock);
124 }
125
126 static void inet_hash_remove(struct in_ifaddr *ifa)
127 {
128 spin_lock(&inet_addr_hash_lock);
129 hlist_del_init_rcu(&ifa->hash);
130 spin_unlock(&inet_addr_hash_lock);
131 }
132
133 /**
134 * __ip_dev_find - find the first device with a given source address.
135 * @net: the net namespace
136 * @addr: the source address
137 * @devref: if true, take a reference on the found device
138 *
139 * If a caller uses devref=false, it should be protected by RCU, or RTNL
140 */
141 struct net_device *__ip_dev_find(struct net *net, __be32 addr, bool devref)
142 {
143 u32 hash = inet_addr_hash(net, addr);
144 struct net_device *result = NULL;
145 struct in_ifaddr *ifa;
146
147 rcu_read_lock();
148 hlist_for_each_entry_rcu(ifa, &inet_addr_lst[hash], hash) {
149 if (ifa->ifa_local == addr) {
150 struct net_device *dev = ifa->ifa_dev->dev;
151
152 if (!net_eq(dev_net(dev), net))
153 continue;
154 result = dev;
155 break;
156 }
157 }
158 if (!result) {
159 struct flowi4 fl4 = { .daddr = addr };
160 struct fib_result res = { 0 };
161 struct fib_table *local;
162
163 /* Fallback to FIB local table so that communication
164 * over loopback subnets work.
165 */
166 local = fib_get_table(net, RT_TABLE_LOCAL);
167 if (local &&
168 !fib_table_lookup(local, &fl4, &res, FIB_LOOKUP_NOREF) &&
169 res.type == RTN_LOCAL)
170 result = FIB_RES_DEV(res);
171 }
172 if (result && devref)
173 dev_hold(result);
174 rcu_read_unlock();
175 return result;
176 }
177 EXPORT_SYMBOL(__ip_dev_find);
178
179 static void rtmsg_ifa(int event, struct in_ifaddr *, struct nlmsghdr *, u32);
180
181 static BLOCKING_NOTIFIER_HEAD(inetaddr_chain);
182 static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
183 int destroy);
184 #ifdef CONFIG_SYSCTL
185 static void devinet_sysctl_register(struct in_device *idev);
186 static void devinet_sysctl_unregister(struct in_device *idev);
187 #else
188 static void devinet_sysctl_register(struct in_device *idev)
189 {
190 }
191 static void devinet_sysctl_unregister(struct in_device *idev)
192 {
193 }
194 #endif
195
196 /* Locks all the inet devices. */
197
198 static struct in_ifaddr *inet_alloc_ifa(void)
199 {
200 return kzalloc(sizeof(struct in_ifaddr), GFP_KERNEL);
201 }
202
203 static void inet_rcu_free_ifa(struct rcu_head *head)
204 {
205 struct in_ifaddr *ifa = container_of(head, struct in_ifaddr, rcu_head);
206 if (ifa->ifa_dev)
207 in_dev_put(ifa->ifa_dev);
208 kfree(ifa);
209 }
210
211 static void inet_free_ifa(struct in_ifaddr *ifa)
212 {
213 call_rcu(&ifa->rcu_head, inet_rcu_free_ifa);
214 }
215
216 void in_dev_finish_destroy(struct in_device *idev)
217 {
218 struct net_device *dev = idev->dev;
219
220 WARN_ON(idev->ifa_list);
221 WARN_ON(idev->mc_list);
222 kfree(rcu_dereference_protected(idev->mc_hash, 1));
223 #ifdef NET_REFCNT_DEBUG
224 pr_debug("%s: %p=%s\n", __func__, idev, dev ? dev->name : "NIL");
225 #endif
226 dev_put(dev);
227 if (!idev->dead)
228 pr_err("Freeing alive in_device %p\n", idev);
229 else
230 kfree(idev);
231 }
232 EXPORT_SYMBOL(in_dev_finish_destroy);
233
234 static struct in_device *inetdev_init(struct net_device *dev)
235 {
236 struct in_device *in_dev;
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 devinet_sysctl_register(in_dev);
258 ip_mc_init_dev(in_dev);
259 if (dev->flags & IFF_UP)
260 ip_mc_up(in_dev);
261
262 /* we can receive as soon as ip_ptr is set -- do this last */
263 rcu_assign_pointer(dev->ip_ptr, in_dev);
264 out:
265 return in_dev;
266 out_kfree:
267 kfree(in_dev);
268 in_dev = NULL;
269 goto out;
270 }
271
272 static void in_dev_rcu_put(struct rcu_head *head)
273 {
274 struct in_device *idev = container_of(head, struct in_device, rcu_head);
275 in_dev_put(idev);
276 }
277
278 static void inetdev_destroy(struct in_device *in_dev)
279 {
280 struct in_ifaddr *ifa;
281 struct net_device *dev;
282
283 ASSERT_RTNL();
284
285 dev = in_dev->dev;
286
287 in_dev->dead = 1;
288
289 ip_mc_destroy_dev(in_dev);
290
291 while ((ifa = in_dev->ifa_list) != NULL) {
292 inet_del_ifa(in_dev, &in_dev->ifa_list, 0);
293 inet_free_ifa(ifa);
294 }
295
296 RCU_INIT_POINTER(dev->ip_ptr, NULL);
297
298 devinet_sysctl_unregister(in_dev);
299 neigh_parms_release(&arp_tbl, in_dev->arp_parms);
300 arp_ifdown(dev);
301
302 call_rcu(&in_dev->rcu_head, in_dev_rcu_put);
303 }
304
305 int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b)
306 {
307 rcu_read_lock();
308 for_primary_ifa(in_dev) {
309 if (inet_ifa_match(a, ifa)) {
310 if (!b || inet_ifa_match(b, ifa)) {
311 rcu_read_unlock();
312 return 1;
313 }
314 }
315 } endfor_ifa(in_dev);
316 rcu_read_unlock();
317 return 0;
318 }
319
320 static void __inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
321 int destroy, struct nlmsghdr *nlh, u32 portid)
322 {
323 struct in_ifaddr *promote = NULL;
324 struct in_ifaddr *ifa, *ifa1 = *ifap;
325 struct in_ifaddr *last_prim = in_dev->ifa_list;
326 struct in_ifaddr *prev_prom = NULL;
327 int do_promote = IN_DEV_PROMOTE_SECONDARIES(in_dev);
328
329 ASSERT_RTNL();
330
331 if (in_dev->dead)
332 goto no_promotions;
333
334 /* 1. Deleting primary ifaddr forces deletion all secondaries
335 * unless alias promotion is set
336 **/
337
338 if (!(ifa1->ifa_flags & IFA_F_SECONDARY)) {
339 struct in_ifaddr **ifap1 = &ifa1->ifa_next;
340
341 while ((ifa = *ifap1) != NULL) {
342 if (!(ifa->ifa_flags & IFA_F_SECONDARY) &&
343 ifa1->ifa_scope <= ifa->ifa_scope)
344 last_prim = ifa;
345
346 if (!(ifa->ifa_flags & IFA_F_SECONDARY) ||
347 ifa1->ifa_mask != ifa->ifa_mask ||
348 !inet_ifa_match(ifa1->ifa_address, ifa)) {
349 ifap1 = &ifa->ifa_next;
350 prev_prom = ifa;
351 continue;
352 }
353
354 if (!do_promote) {
355 inet_hash_remove(ifa);
356 *ifap1 = ifa->ifa_next;
357
358 rtmsg_ifa(RTM_DELADDR, ifa, nlh, portid);
359 blocking_notifier_call_chain(&inetaddr_chain,
360 NETDEV_DOWN, ifa);
361 inet_free_ifa(ifa);
362 } else {
363 promote = ifa;
364 break;
365 }
366 }
367 }
368
369 /* On promotion all secondaries from subnet are changing
370 * the primary IP, we must remove all their routes silently
371 * and later to add them back with new prefsrc. Do this
372 * while all addresses are on the device list.
373 */
374 for (ifa = promote; ifa; ifa = ifa->ifa_next) {
375 if (ifa1->ifa_mask == ifa->ifa_mask &&
376 inet_ifa_match(ifa1->ifa_address, ifa))
377 fib_del_ifaddr(ifa, ifa1);
378 }
379
380 no_promotions:
381 /* 2. Unlink it */
382
383 *ifap = ifa1->ifa_next;
384 inet_hash_remove(ifa1);
385
386 /* 3. Announce address deletion */
387
388 /* Send message first, then call notifier.
389 At first sight, FIB update triggered by notifier
390 will refer to already deleted ifaddr, that could confuse
391 netlink listeners. It is not true: look, gated sees
392 that route deleted and if it still thinks that ifaddr
393 is valid, it will try to restore deleted routes... Grr.
394 So that, this order is correct.
395 */
396 rtmsg_ifa(RTM_DELADDR, ifa1, nlh, portid);
397 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa1);
398
399 if (promote) {
400 struct in_ifaddr *next_sec = promote->ifa_next;
401
402 if (prev_prom) {
403 prev_prom->ifa_next = promote->ifa_next;
404 promote->ifa_next = last_prim->ifa_next;
405 last_prim->ifa_next = promote;
406 }
407
408 promote->ifa_flags &= ~IFA_F_SECONDARY;
409 rtmsg_ifa(RTM_NEWADDR, promote, nlh, portid);
410 blocking_notifier_call_chain(&inetaddr_chain,
411 NETDEV_UP, promote);
412 for (ifa = next_sec; ifa; ifa = ifa->ifa_next) {
413 if (ifa1->ifa_mask != ifa->ifa_mask ||
414 !inet_ifa_match(ifa1->ifa_address, ifa))
415 continue;
416 fib_add_ifaddr(ifa);
417 }
418
419 }
420 if (destroy)
421 inet_free_ifa(ifa1);
422 }
423
424 static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
425 int destroy)
426 {
427 __inet_del_ifa(in_dev, ifap, destroy, NULL, 0);
428 }
429
430 static void check_lifetime(struct work_struct *work);
431
432 static DECLARE_DELAYED_WORK(check_lifetime_work, check_lifetime);
433
434 static int __inet_insert_ifa(struct in_ifaddr *ifa, struct nlmsghdr *nlh,
435 u32 portid)
436 {
437 struct in_device *in_dev = ifa->ifa_dev;
438 struct in_ifaddr *ifa1, **ifap, **last_primary;
439
440 ASSERT_RTNL();
441
442 if (!ifa->ifa_local) {
443 inet_free_ifa(ifa);
444 return 0;
445 }
446
447 ifa->ifa_flags &= ~IFA_F_SECONDARY;
448 last_primary = &in_dev->ifa_list;
449
450 for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL;
451 ifap = &ifa1->ifa_next) {
452 if (!(ifa1->ifa_flags & IFA_F_SECONDARY) &&
453 ifa->ifa_scope <= ifa1->ifa_scope)
454 last_primary = &ifa1->ifa_next;
455 if (ifa1->ifa_mask == ifa->ifa_mask &&
456 inet_ifa_match(ifa1->ifa_address, ifa)) {
457 if (ifa1->ifa_local == ifa->ifa_local) {
458 inet_free_ifa(ifa);
459 return -EEXIST;
460 }
461 if (ifa1->ifa_scope != ifa->ifa_scope) {
462 inet_free_ifa(ifa);
463 return -EINVAL;
464 }
465 ifa->ifa_flags |= IFA_F_SECONDARY;
466 }
467 }
468
469 if (!(ifa->ifa_flags & IFA_F_SECONDARY)) {
470 net_srandom(ifa->ifa_local);
471 ifap = last_primary;
472 }
473
474 ifa->ifa_next = *ifap;
475 *ifap = ifa;
476
477 inet_hash_insert(dev_net(in_dev->dev), ifa);
478
479 cancel_delayed_work(&check_lifetime_work);
480 schedule_delayed_work(&check_lifetime_work, 0);
481
482 /* Send message first, then call notifier.
483 Notifier will trigger FIB update, so that
484 listeners of netlink will know about new ifaddr */
485 rtmsg_ifa(RTM_NEWADDR, ifa, nlh, portid);
486 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa);
487
488 return 0;
489 }
490
491 static int inet_insert_ifa(struct in_ifaddr *ifa)
492 {
493 return __inet_insert_ifa(ifa, NULL, 0);
494 }
495
496 static int inet_set_ifa(struct net_device *dev, struct in_ifaddr *ifa)
497 {
498 struct in_device *in_dev = __in_dev_get_rtnl(dev);
499
500 ASSERT_RTNL();
501
502 if (!in_dev) {
503 inet_free_ifa(ifa);
504 return -ENOBUFS;
505 }
506 ipv4_devconf_setall(in_dev);
507 if (ifa->ifa_dev != in_dev) {
508 WARN_ON(ifa->ifa_dev);
509 in_dev_hold(in_dev);
510 ifa->ifa_dev = in_dev;
511 }
512 if (ipv4_is_loopback(ifa->ifa_local))
513 ifa->ifa_scope = RT_SCOPE_HOST;
514 return inet_insert_ifa(ifa);
515 }
516
517 /* Caller must hold RCU or RTNL :
518 * We dont take a reference on found in_device
519 */
520 struct in_device *inetdev_by_index(struct net *net, int ifindex)
521 {
522 struct net_device *dev;
523 struct in_device *in_dev = NULL;
524
525 rcu_read_lock();
526 dev = dev_get_by_index_rcu(net, ifindex);
527 if (dev)
528 in_dev = rcu_dereference_rtnl(dev->ip_ptr);
529 rcu_read_unlock();
530 return in_dev;
531 }
532 EXPORT_SYMBOL(inetdev_by_index);
533
534 /* Called only from RTNL semaphored context. No locks. */
535
536 struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix,
537 __be32 mask)
538 {
539 ASSERT_RTNL();
540
541 for_primary_ifa(in_dev) {
542 if (ifa->ifa_mask == mask && inet_ifa_match(prefix, ifa))
543 return ifa;
544 } endfor_ifa(in_dev);
545 return NULL;
546 }
547
548 static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
549 {
550 struct net *net = sock_net(skb->sk);
551 struct nlattr *tb[IFA_MAX+1];
552 struct in_device *in_dev;
553 struct ifaddrmsg *ifm;
554 struct in_ifaddr *ifa, **ifap;
555 int err = -EINVAL;
556
557 ASSERT_RTNL();
558
559 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy);
560 if (err < 0)
561 goto errout;
562
563 ifm = nlmsg_data(nlh);
564 in_dev = inetdev_by_index(net, ifm->ifa_index);
565 if (in_dev == NULL) {
566 err = -ENODEV;
567 goto errout;
568 }
569
570 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
571 ifap = &ifa->ifa_next) {
572 if (tb[IFA_LOCAL] &&
573 ifa->ifa_local != nla_get_be32(tb[IFA_LOCAL]))
574 continue;
575
576 if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label))
577 continue;
578
579 if (tb[IFA_ADDRESS] &&
580 (ifm->ifa_prefixlen != ifa->ifa_prefixlen ||
581 !inet_ifa_match(nla_get_be32(tb[IFA_ADDRESS]), ifa)))
582 continue;
583
584 __inet_del_ifa(in_dev, ifap, 1, nlh, NETLINK_CB(skb).portid);
585 return 0;
586 }
587
588 err = -EADDRNOTAVAIL;
589 errout:
590 return err;
591 }
592
593 #define INFINITY_LIFE_TIME 0xFFFFFFFF
594
595 static void check_lifetime(struct work_struct *work)
596 {
597 unsigned long now, next, next_sec, next_sched;
598 struct in_ifaddr *ifa;
599 struct hlist_node *n;
600 int i;
601
602 now = jiffies;
603 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
604
605 for (i = 0; i < IN4_ADDR_HSIZE; i++) {
606 bool change_needed = false;
607
608 rcu_read_lock();
609 hlist_for_each_entry_rcu(ifa, &inet_addr_lst[i], hash) {
610 unsigned long age;
611
612 if (ifa->ifa_flags & IFA_F_PERMANENT)
613 continue;
614
615 /* We try to batch several events at once. */
616 age = (now - ifa->ifa_tstamp +
617 ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
618
619 if (ifa->ifa_valid_lft != INFINITY_LIFE_TIME &&
620 age >= ifa->ifa_valid_lft) {
621 change_needed = true;
622 } else if (ifa->ifa_preferred_lft ==
623 INFINITY_LIFE_TIME) {
624 continue;
625 } else if (age >= ifa->ifa_preferred_lft) {
626 if (time_before(ifa->ifa_tstamp +
627 ifa->ifa_valid_lft * HZ, next))
628 next = ifa->ifa_tstamp +
629 ifa->ifa_valid_lft * HZ;
630
631 if (!(ifa->ifa_flags & IFA_F_DEPRECATED))
632 change_needed = true;
633 } else if (time_before(ifa->ifa_tstamp +
634 ifa->ifa_preferred_lft * HZ,
635 next)) {
636 next = ifa->ifa_tstamp +
637 ifa->ifa_preferred_lft * HZ;
638 }
639 }
640 rcu_read_unlock();
641 if (!change_needed)
642 continue;
643 rtnl_lock();
644 hlist_for_each_entry_safe(ifa, n, &inet_addr_lst[i], hash) {
645 unsigned long age;
646
647 if (ifa->ifa_flags & IFA_F_PERMANENT)
648 continue;
649
650 /* We try to batch several events at once. */
651 age = (now - ifa->ifa_tstamp +
652 ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
653
654 if (ifa->ifa_valid_lft != INFINITY_LIFE_TIME &&
655 age >= ifa->ifa_valid_lft) {
656 struct in_ifaddr **ifap;
657
658 for (ifap = &ifa->ifa_dev->ifa_list;
659 *ifap != NULL; ifap = &(*ifap)->ifa_next) {
660 if (*ifap == ifa) {
661 inet_del_ifa(ifa->ifa_dev,
662 ifap, 1);
663 break;
664 }
665 }
666 } else if (ifa->ifa_preferred_lft !=
667 INFINITY_LIFE_TIME &&
668 age >= ifa->ifa_preferred_lft &&
669 !(ifa->ifa_flags & IFA_F_DEPRECATED)) {
670 ifa->ifa_flags |= IFA_F_DEPRECATED;
671 rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0);
672 }
673 }
674 rtnl_unlock();
675 }
676
677 next_sec = round_jiffies_up(next);
678 next_sched = next;
679
680 /* If rounded timeout is accurate enough, accept it. */
681 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
682 next_sched = next_sec;
683
684 now = jiffies;
685 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
686 if (time_before(next_sched, now + ADDRCONF_TIMER_FUZZ_MAX))
687 next_sched = now + ADDRCONF_TIMER_FUZZ_MAX;
688
689 schedule_delayed_work(&check_lifetime_work, next_sched - now);
690 }
691
692 static void set_ifa_lifetime(struct in_ifaddr *ifa, __u32 valid_lft,
693 __u32 prefered_lft)
694 {
695 unsigned long timeout;
696
697 ifa->ifa_flags &= ~(IFA_F_PERMANENT | IFA_F_DEPRECATED);
698
699 timeout = addrconf_timeout_fixup(valid_lft, HZ);
700 if (addrconf_finite_timeout(timeout))
701 ifa->ifa_valid_lft = timeout;
702 else
703 ifa->ifa_flags |= IFA_F_PERMANENT;
704
705 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
706 if (addrconf_finite_timeout(timeout)) {
707 if (timeout == 0)
708 ifa->ifa_flags |= IFA_F_DEPRECATED;
709 ifa->ifa_preferred_lft = timeout;
710 }
711 ifa->ifa_tstamp = jiffies;
712 if (!ifa->ifa_cstamp)
713 ifa->ifa_cstamp = ifa->ifa_tstamp;
714 }
715
716 static struct in_ifaddr *rtm_to_ifaddr(struct net *net, struct nlmsghdr *nlh,
717 __u32 *pvalid_lft, __u32 *pprefered_lft)
718 {
719 struct nlattr *tb[IFA_MAX+1];
720 struct in_ifaddr *ifa;
721 struct ifaddrmsg *ifm;
722 struct net_device *dev;
723 struct in_device *in_dev;
724 int err;
725
726 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy);
727 if (err < 0)
728 goto errout;
729
730 ifm = nlmsg_data(nlh);
731 err = -EINVAL;
732 if (ifm->ifa_prefixlen > 32 || tb[IFA_LOCAL] == NULL)
733 goto errout;
734
735 dev = __dev_get_by_index(net, ifm->ifa_index);
736 err = -ENODEV;
737 if (dev == NULL)
738 goto errout;
739
740 in_dev = __in_dev_get_rtnl(dev);
741 err = -ENOBUFS;
742 if (in_dev == NULL)
743 goto errout;
744
745 ifa = inet_alloc_ifa();
746 if (ifa == NULL)
747 /*
748 * A potential indev allocation can be left alive, it stays
749 * assigned to its device and is destroy with it.
750 */
751 goto errout;
752
753 ipv4_devconf_setall(in_dev);
754 in_dev_hold(in_dev);
755
756 if (tb[IFA_ADDRESS] == NULL)
757 tb[IFA_ADDRESS] = tb[IFA_LOCAL];
758
759 INIT_HLIST_NODE(&ifa->hash);
760 ifa->ifa_prefixlen = ifm->ifa_prefixlen;
761 ifa->ifa_mask = inet_make_mask(ifm->ifa_prefixlen);
762 ifa->ifa_flags = ifm->ifa_flags;
763 ifa->ifa_scope = ifm->ifa_scope;
764 ifa->ifa_dev = in_dev;
765
766 ifa->ifa_local = nla_get_be32(tb[IFA_LOCAL]);
767 ifa->ifa_address = nla_get_be32(tb[IFA_ADDRESS]);
768
769 if (tb[IFA_BROADCAST])
770 ifa->ifa_broadcast = nla_get_be32(tb[IFA_BROADCAST]);
771
772 if (tb[IFA_LABEL])
773 nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ);
774 else
775 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
776
777 if (tb[IFA_CACHEINFO]) {
778 struct ifa_cacheinfo *ci;
779
780 ci = nla_data(tb[IFA_CACHEINFO]);
781 if (!ci->ifa_valid || ci->ifa_prefered > ci->ifa_valid) {
782 err = -EINVAL;
783 goto errout_free;
784 }
785 *pvalid_lft = ci->ifa_valid;
786 *pprefered_lft = ci->ifa_prefered;
787 }
788
789 return ifa;
790
791 errout_free:
792 inet_free_ifa(ifa);
793 errout:
794 return ERR_PTR(err);
795 }
796
797 static struct in_ifaddr *find_matching_ifa(struct in_ifaddr *ifa)
798 {
799 struct in_device *in_dev = ifa->ifa_dev;
800 struct in_ifaddr *ifa1, **ifap;
801
802 if (!ifa->ifa_local)
803 return NULL;
804
805 for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL;
806 ifap = &ifa1->ifa_next) {
807 if (ifa1->ifa_mask == ifa->ifa_mask &&
808 inet_ifa_match(ifa1->ifa_address, ifa) &&
809 ifa1->ifa_local == ifa->ifa_local)
810 return ifa1;
811 }
812 return NULL;
813 }
814
815 static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
816 {
817 struct net *net = sock_net(skb->sk);
818 struct in_ifaddr *ifa;
819 struct in_ifaddr *ifa_existing;
820 __u32 valid_lft = INFINITY_LIFE_TIME;
821 __u32 prefered_lft = INFINITY_LIFE_TIME;
822
823 ASSERT_RTNL();
824
825 ifa = rtm_to_ifaddr(net, nlh, &valid_lft, &prefered_lft);
826 if (IS_ERR(ifa))
827 return PTR_ERR(ifa);
828
829 ifa_existing = find_matching_ifa(ifa);
830 if (!ifa_existing) {
831 /* It would be best to check for !NLM_F_CREATE here but
832 * userspace alreay relies on not having to provide this.
833 */
834 set_ifa_lifetime(ifa, valid_lft, prefered_lft);
835 return __inet_insert_ifa(ifa, nlh, NETLINK_CB(skb).portid);
836 } else {
837 inet_free_ifa(ifa);
838
839 if (nlh->nlmsg_flags & NLM_F_EXCL ||
840 !(nlh->nlmsg_flags & NLM_F_REPLACE))
841 return -EEXIST;
842 ifa = ifa_existing;
843 set_ifa_lifetime(ifa, valid_lft, prefered_lft);
844 cancel_delayed_work(&check_lifetime_work);
845 schedule_delayed_work(&check_lifetime_work, 0);
846 rtmsg_ifa(RTM_NEWADDR, ifa, nlh, NETLINK_CB(skb).portid);
847 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa);
848 }
849 return 0;
850 }
851
852 /*
853 * Determine a default network mask, based on the IP address.
854 */
855
856 static int inet_abc_len(__be32 addr)
857 {
858 int rc = -1; /* Something else, probably a multicast. */
859
860 if (ipv4_is_zeronet(addr))
861 rc = 0;
862 else {
863 __u32 haddr = ntohl(addr);
864
865 if (IN_CLASSA(haddr))
866 rc = 8;
867 else if (IN_CLASSB(haddr))
868 rc = 16;
869 else if (IN_CLASSC(haddr))
870 rc = 24;
871 }
872
873 return rc;
874 }
875
876
877 int devinet_ioctl(struct net *net, unsigned int cmd, void __user *arg)
878 {
879 struct ifreq ifr;
880 struct sockaddr_in sin_orig;
881 struct sockaddr_in *sin = (struct sockaddr_in *)&ifr.ifr_addr;
882 struct in_device *in_dev;
883 struct in_ifaddr **ifap = NULL;
884 struct in_ifaddr *ifa = NULL;
885 struct net_device *dev;
886 char *colon;
887 int ret = -EFAULT;
888 int tryaddrmatch = 0;
889
890 /*
891 * Fetch the caller's info block into kernel space
892 */
893
894 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
895 goto out;
896 ifr.ifr_name[IFNAMSIZ - 1] = 0;
897
898 /* save original address for comparison */
899 memcpy(&sin_orig, sin, sizeof(*sin));
900
901 colon = strchr(ifr.ifr_name, ':');
902 if (colon)
903 *colon = 0;
904
905 dev_load(net, ifr.ifr_name);
906
907 switch (cmd) {
908 case SIOCGIFADDR: /* Get interface address */
909 case SIOCGIFBRDADDR: /* Get the broadcast address */
910 case SIOCGIFDSTADDR: /* Get the destination address */
911 case SIOCGIFNETMASK: /* Get the netmask for the interface */
912 /* Note that these ioctls will not sleep,
913 so that we do not impose a lock.
914 One day we will be forced to put shlock here (I mean SMP)
915 */
916 tryaddrmatch = (sin_orig.sin_family == AF_INET);
917 memset(sin, 0, sizeof(*sin));
918 sin->sin_family = AF_INET;
919 break;
920
921 case SIOCSIFFLAGS:
922 ret = -EPERM;
923 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
924 goto out;
925 break;
926 case SIOCSIFADDR: /* Set interface address (and family) */
927 case SIOCSIFBRDADDR: /* Set the broadcast address */
928 case SIOCSIFDSTADDR: /* Set the destination address */
929 case SIOCSIFNETMASK: /* Set the netmask for the interface */
930 ret = -EPERM;
931 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
932 goto out;
933 ret = -EINVAL;
934 if (sin->sin_family != AF_INET)
935 goto out;
936 break;
937 default:
938 ret = -EINVAL;
939 goto out;
940 }
941
942 rtnl_lock();
943
944 ret = -ENODEV;
945 dev = __dev_get_by_name(net, ifr.ifr_name);
946 if (!dev)
947 goto done;
948
949 if (colon)
950 *colon = ':';
951
952 in_dev = __in_dev_get_rtnl(dev);
953 if (in_dev) {
954 if (tryaddrmatch) {
955 /* Matthias Andree */
956 /* compare label and address (4.4BSD style) */
957 /* note: we only do this for a limited set of ioctls
958 and only if the original address family was AF_INET.
959 This is checked above. */
960 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
961 ifap = &ifa->ifa_next) {
962 if (!strcmp(ifr.ifr_name, ifa->ifa_label) &&
963 sin_orig.sin_addr.s_addr ==
964 ifa->ifa_local) {
965 break; /* found */
966 }
967 }
968 }
969 /* we didn't get a match, maybe the application is
970 4.3BSD-style and passed in junk so we fall back to
971 comparing just the label */
972 if (!ifa) {
973 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
974 ifap = &ifa->ifa_next)
975 if (!strcmp(ifr.ifr_name, ifa->ifa_label))
976 break;
977 }
978 }
979
980 ret = -EADDRNOTAVAIL;
981 if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS)
982 goto done;
983
984 switch (cmd) {
985 case SIOCGIFADDR: /* Get interface address */
986 sin->sin_addr.s_addr = ifa->ifa_local;
987 goto rarok;
988
989 case SIOCGIFBRDADDR: /* Get the broadcast address */
990 sin->sin_addr.s_addr = ifa->ifa_broadcast;
991 goto rarok;
992
993 case SIOCGIFDSTADDR: /* Get the destination address */
994 sin->sin_addr.s_addr = ifa->ifa_address;
995 goto rarok;
996
997 case SIOCGIFNETMASK: /* Get the netmask for the interface */
998 sin->sin_addr.s_addr = ifa->ifa_mask;
999 goto rarok;
1000
1001 case SIOCSIFFLAGS:
1002 if (colon) {
1003 ret = -EADDRNOTAVAIL;
1004 if (!ifa)
1005 break;
1006 ret = 0;
1007 if (!(ifr.ifr_flags & IFF_UP))
1008 inet_del_ifa(in_dev, ifap, 1);
1009 break;
1010 }
1011 ret = dev_change_flags(dev, ifr.ifr_flags);
1012 break;
1013
1014 case SIOCSIFADDR: /* Set interface address (and family) */
1015 ret = -EINVAL;
1016 if (inet_abc_len(sin->sin_addr.s_addr) < 0)
1017 break;
1018
1019 if (!ifa) {
1020 ret = -ENOBUFS;
1021 ifa = inet_alloc_ifa();
1022 if (!ifa)
1023 break;
1024 INIT_HLIST_NODE(&ifa->hash);
1025 if (colon)
1026 memcpy(ifa->ifa_label, ifr.ifr_name, IFNAMSIZ);
1027 else
1028 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1029 } else {
1030 ret = 0;
1031 if (ifa->ifa_local == sin->sin_addr.s_addr)
1032 break;
1033 inet_del_ifa(in_dev, ifap, 0);
1034 ifa->ifa_broadcast = 0;
1035 ifa->ifa_scope = 0;
1036 }
1037
1038 ifa->ifa_address = ifa->ifa_local = sin->sin_addr.s_addr;
1039
1040 if (!(dev->flags & IFF_POINTOPOINT)) {
1041 ifa->ifa_prefixlen = inet_abc_len(ifa->ifa_address);
1042 ifa->ifa_mask = inet_make_mask(ifa->ifa_prefixlen);
1043 if ((dev->flags & IFF_BROADCAST) &&
1044 ifa->ifa_prefixlen < 31)
1045 ifa->ifa_broadcast = ifa->ifa_address |
1046 ~ifa->ifa_mask;
1047 } else {
1048 ifa->ifa_prefixlen = 32;
1049 ifa->ifa_mask = inet_make_mask(32);
1050 }
1051 set_ifa_lifetime(ifa, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1052 ret = inet_set_ifa(dev, ifa);
1053 break;
1054
1055 case SIOCSIFBRDADDR: /* Set the broadcast address */
1056 ret = 0;
1057 if (ifa->ifa_broadcast != sin->sin_addr.s_addr) {
1058 inet_del_ifa(in_dev, ifap, 0);
1059 ifa->ifa_broadcast = sin->sin_addr.s_addr;
1060 inet_insert_ifa(ifa);
1061 }
1062 break;
1063
1064 case SIOCSIFDSTADDR: /* Set the destination address */
1065 ret = 0;
1066 if (ifa->ifa_address == sin->sin_addr.s_addr)
1067 break;
1068 ret = -EINVAL;
1069 if (inet_abc_len(sin->sin_addr.s_addr) < 0)
1070 break;
1071 ret = 0;
1072 inet_del_ifa(in_dev, ifap, 0);
1073 ifa->ifa_address = sin->sin_addr.s_addr;
1074 inet_insert_ifa(ifa);
1075 break;
1076
1077 case SIOCSIFNETMASK: /* Set the netmask for the interface */
1078
1079 /*
1080 * The mask we set must be legal.
1081 */
1082 ret = -EINVAL;
1083 if (bad_mask(sin->sin_addr.s_addr, 0))
1084 break;
1085 ret = 0;
1086 if (ifa->ifa_mask != sin->sin_addr.s_addr) {
1087 __be32 old_mask = ifa->ifa_mask;
1088 inet_del_ifa(in_dev, ifap, 0);
1089 ifa->ifa_mask = sin->sin_addr.s_addr;
1090 ifa->ifa_prefixlen = inet_mask_len(ifa->ifa_mask);
1091
1092 /* See if current broadcast address matches
1093 * with current netmask, then recalculate
1094 * the broadcast address. Otherwise it's a
1095 * funny address, so don't touch it since
1096 * the user seems to know what (s)he's doing...
1097 */
1098 if ((dev->flags & IFF_BROADCAST) &&
1099 (ifa->ifa_prefixlen < 31) &&
1100 (ifa->ifa_broadcast ==
1101 (ifa->ifa_local|~old_mask))) {
1102 ifa->ifa_broadcast = (ifa->ifa_local |
1103 ~sin->sin_addr.s_addr);
1104 }
1105 inet_insert_ifa(ifa);
1106 }
1107 break;
1108 }
1109 done:
1110 rtnl_unlock();
1111 out:
1112 return ret;
1113 rarok:
1114 rtnl_unlock();
1115 ret = copy_to_user(arg, &ifr, sizeof(struct ifreq)) ? -EFAULT : 0;
1116 goto out;
1117 }
1118
1119 static int inet_gifconf(struct net_device *dev, char __user *buf, int len)
1120 {
1121 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1122 struct in_ifaddr *ifa;
1123 struct ifreq ifr;
1124 int done = 0;
1125
1126 if (!in_dev)
1127 goto out;
1128
1129 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1130 if (!buf) {
1131 done += sizeof(ifr);
1132 continue;
1133 }
1134 if (len < (int) sizeof(ifr))
1135 break;
1136 memset(&ifr, 0, sizeof(struct ifreq));
1137 strcpy(ifr.ifr_name, ifa->ifa_label);
1138
1139 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_family = AF_INET;
1140 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_addr.s_addr =
1141 ifa->ifa_local;
1142
1143 if (copy_to_user(buf, &ifr, sizeof(struct ifreq))) {
1144 done = -EFAULT;
1145 break;
1146 }
1147 buf += sizeof(struct ifreq);
1148 len -= sizeof(struct ifreq);
1149 done += sizeof(struct ifreq);
1150 }
1151 out:
1152 return done;
1153 }
1154
1155 __be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope)
1156 {
1157 __be32 addr = 0;
1158 struct in_device *in_dev;
1159 struct net *net = dev_net(dev);
1160
1161 rcu_read_lock();
1162 in_dev = __in_dev_get_rcu(dev);
1163 if (!in_dev)
1164 goto no_in_dev;
1165
1166 for_primary_ifa(in_dev) {
1167 if (ifa->ifa_scope > scope)
1168 continue;
1169 if (!dst || inet_ifa_match(dst, ifa)) {
1170 addr = ifa->ifa_local;
1171 break;
1172 }
1173 if (!addr)
1174 addr = ifa->ifa_local;
1175 } endfor_ifa(in_dev);
1176
1177 if (addr)
1178 goto out_unlock;
1179 no_in_dev:
1180
1181 /* Not loopback addresses on loopback should be preferred
1182 in this case. It is importnat that lo is the first interface
1183 in dev_base list.
1184 */
1185 for_each_netdev_rcu(net, dev) {
1186 in_dev = __in_dev_get_rcu(dev);
1187 if (!in_dev)
1188 continue;
1189
1190 for_primary_ifa(in_dev) {
1191 if (ifa->ifa_scope != RT_SCOPE_LINK &&
1192 ifa->ifa_scope <= scope) {
1193 addr = ifa->ifa_local;
1194 goto out_unlock;
1195 }
1196 } endfor_ifa(in_dev);
1197 }
1198 out_unlock:
1199 rcu_read_unlock();
1200 return addr;
1201 }
1202 EXPORT_SYMBOL(inet_select_addr);
1203
1204 static __be32 confirm_addr_indev(struct in_device *in_dev, __be32 dst,
1205 __be32 local, int scope)
1206 {
1207 int same = 0;
1208 __be32 addr = 0;
1209
1210 for_ifa(in_dev) {
1211 if (!addr &&
1212 (local == ifa->ifa_local || !local) &&
1213 ifa->ifa_scope <= scope) {
1214 addr = ifa->ifa_local;
1215 if (same)
1216 break;
1217 }
1218 if (!same) {
1219 same = (!local || inet_ifa_match(local, ifa)) &&
1220 (!dst || inet_ifa_match(dst, ifa));
1221 if (same && addr) {
1222 if (local || !dst)
1223 break;
1224 /* Is the selected addr into dst subnet? */
1225 if (inet_ifa_match(addr, ifa))
1226 break;
1227 /* No, then can we use new local src? */
1228 if (ifa->ifa_scope <= scope) {
1229 addr = ifa->ifa_local;
1230 break;
1231 }
1232 /* search for large dst subnet for addr */
1233 same = 0;
1234 }
1235 }
1236 } endfor_ifa(in_dev);
1237
1238 return same ? addr : 0;
1239 }
1240
1241 /*
1242 * Confirm that local IP address exists using wildcards:
1243 * - in_dev: only on this interface, 0=any interface
1244 * - dst: only in the same subnet as dst, 0=any dst
1245 * - local: address, 0=autoselect the local address
1246 * - scope: maximum allowed scope value for the local address
1247 */
1248 __be32 inet_confirm_addr(struct in_device *in_dev,
1249 __be32 dst, __be32 local, int scope)
1250 {
1251 __be32 addr = 0;
1252 struct net_device *dev;
1253 struct net *net;
1254
1255 if (scope != RT_SCOPE_LINK)
1256 return confirm_addr_indev(in_dev, dst, local, scope);
1257
1258 net = dev_net(in_dev->dev);
1259 rcu_read_lock();
1260 for_each_netdev_rcu(net, dev) {
1261 in_dev = __in_dev_get_rcu(dev);
1262 if (in_dev) {
1263 addr = confirm_addr_indev(in_dev, dst, local, scope);
1264 if (addr)
1265 break;
1266 }
1267 }
1268 rcu_read_unlock();
1269
1270 return addr;
1271 }
1272 EXPORT_SYMBOL(inet_confirm_addr);
1273
1274 /*
1275 * Device notifier
1276 */
1277
1278 int register_inetaddr_notifier(struct notifier_block *nb)
1279 {
1280 return blocking_notifier_chain_register(&inetaddr_chain, nb);
1281 }
1282 EXPORT_SYMBOL(register_inetaddr_notifier);
1283
1284 int unregister_inetaddr_notifier(struct notifier_block *nb)
1285 {
1286 return blocking_notifier_chain_unregister(&inetaddr_chain, nb);
1287 }
1288 EXPORT_SYMBOL(unregister_inetaddr_notifier);
1289
1290 /* Rename ifa_labels for a device name change. Make some effort to preserve
1291 * existing alias numbering and to create unique labels if possible.
1292 */
1293 static void inetdev_changename(struct net_device *dev, struct in_device *in_dev)
1294 {
1295 struct in_ifaddr *ifa;
1296 int named = 0;
1297
1298 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1299 char old[IFNAMSIZ], *dot;
1300
1301 memcpy(old, ifa->ifa_label, IFNAMSIZ);
1302 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1303 if (named++ == 0)
1304 goto skip;
1305 dot = strchr(old, ':');
1306 if (dot == NULL) {
1307 sprintf(old, ":%d", named);
1308 dot = old;
1309 }
1310 if (strlen(dot) + strlen(dev->name) < IFNAMSIZ)
1311 strcat(ifa->ifa_label, dot);
1312 else
1313 strcpy(ifa->ifa_label + (IFNAMSIZ - strlen(dot) - 1), dot);
1314 skip:
1315 rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0);
1316 }
1317 }
1318
1319 static bool inetdev_valid_mtu(unsigned int mtu)
1320 {
1321 return mtu >= 68;
1322 }
1323
1324 static void inetdev_send_gratuitous_arp(struct net_device *dev,
1325 struct in_device *in_dev)
1326
1327 {
1328 struct in_ifaddr *ifa;
1329
1330 for (ifa = in_dev->ifa_list; ifa;
1331 ifa = ifa->ifa_next) {
1332 arp_send(ARPOP_REQUEST, ETH_P_ARP,
1333 ifa->ifa_local, dev,
1334 ifa->ifa_local, NULL,
1335 dev->dev_addr, NULL);
1336 }
1337 }
1338
1339 /* Called only under RTNL semaphore */
1340
1341 static int inetdev_event(struct notifier_block *this, unsigned long event,
1342 void *ptr)
1343 {
1344 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1345 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1346
1347 ASSERT_RTNL();
1348
1349 if (!in_dev) {
1350 if (event == NETDEV_REGISTER) {
1351 in_dev = inetdev_init(dev);
1352 if (!in_dev)
1353 return notifier_from_errno(-ENOMEM);
1354 if (dev->flags & IFF_LOOPBACK) {
1355 IN_DEV_CONF_SET(in_dev, NOXFRM, 1);
1356 IN_DEV_CONF_SET(in_dev, NOPOLICY, 1);
1357 }
1358 } else if (event == NETDEV_CHANGEMTU) {
1359 /* Re-enabling IP */
1360 if (inetdev_valid_mtu(dev->mtu))
1361 in_dev = inetdev_init(dev);
1362 }
1363 goto out;
1364 }
1365
1366 switch (event) {
1367 case NETDEV_REGISTER:
1368 pr_debug("%s: bug\n", __func__);
1369 RCU_INIT_POINTER(dev->ip_ptr, NULL);
1370 break;
1371 case NETDEV_UP:
1372 if (!inetdev_valid_mtu(dev->mtu))
1373 break;
1374 if (dev->flags & IFF_LOOPBACK) {
1375 struct in_ifaddr *ifa = inet_alloc_ifa();
1376
1377 if (ifa) {
1378 INIT_HLIST_NODE(&ifa->hash);
1379 ifa->ifa_local =
1380 ifa->ifa_address = htonl(INADDR_LOOPBACK);
1381 ifa->ifa_prefixlen = 8;
1382 ifa->ifa_mask = inet_make_mask(8);
1383 in_dev_hold(in_dev);
1384 ifa->ifa_dev = in_dev;
1385 ifa->ifa_scope = RT_SCOPE_HOST;
1386 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1387 set_ifa_lifetime(ifa, INFINITY_LIFE_TIME,
1388 INFINITY_LIFE_TIME);
1389 inet_insert_ifa(ifa);
1390 }
1391 }
1392 ip_mc_up(in_dev);
1393 /* fall through */
1394 case NETDEV_CHANGEADDR:
1395 if (!IN_DEV_ARP_NOTIFY(in_dev))
1396 break;
1397 /* fall through */
1398 case NETDEV_NOTIFY_PEERS:
1399 /* Send gratuitous ARP to notify of link change */
1400 inetdev_send_gratuitous_arp(dev, in_dev);
1401 break;
1402 case NETDEV_DOWN:
1403 ip_mc_down(in_dev);
1404 break;
1405 case NETDEV_PRE_TYPE_CHANGE:
1406 ip_mc_unmap(in_dev);
1407 break;
1408 case NETDEV_POST_TYPE_CHANGE:
1409 ip_mc_remap(in_dev);
1410 break;
1411 case NETDEV_CHANGEMTU:
1412 if (inetdev_valid_mtu(dev->mtu))
1413 break;
1414 /* disable IP when MTU is not enough */
1415 case NETDEV_UNREGISTER:
1416 inetdev_destroy(in_dev);
1417 break;
1418 case NETDEV_CHANGENAME:
1419 /* Do not notify about label change, this event is
1420 * not interesting to applications using netlink.
1421 */
1422 inetdev_changename(dev, in_dev);
1423
1424 devinet_sysctl_unregister(in_dev);
1425 devinet_sysctl_register(in_dev);
1426 break;
1427 }
1428 out:
1429 return NOTIFY_DONE;
1430 }
1431
1432 static struct notifier_block ip_netdev_notifier = {
1433 .notifier_call = inetdev_event,
1434 };
1435
1436 static size_t inet_nlmsg_size(void)
1437 {
1438 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
1439 + nla_total_size(4) /* IFA_ADDRESS */
1440 + nla_total_size(4) /* IFA_LOCAL */
1441 + nla_total_size(4) /* IFA_BROADCAST */
1442 + nla_total_size(IFNAMSIZ) /* IFA_LABEL */
1443 + nla_total_size(sizeof(struct ifa_cacheinfo)); /* IFA_CACHEINFO */
1444 }
1445
1446 static inline u32 cstamp_delta(unsigned long cstamp)
1447 {
1448 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
1449 }
1450
1451 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
1452 unsigned long tstamp, u32 preferred, u32 valid)
1453 {
1454 struct ifa_cacheinfo ci;
1455
1456 ci.cstamp = cstamp_delta(cstamp);
1457 ci.tstamp = cstamp_delta(tstamp);
1458 ci.ifa_prefered = preferred;
1459 ci.ifa_valid = valid;
1460
1461 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
1462 }
1463
1464 static int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa,
1465 u32 portid, u32 seq, int event, unsigned int flags)
1466 {
1467 struct ifaddrmsg *ifm;
1468 struct nlmsghdr *nlh;
1469 u32 preferred, valid;
1470
1471 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*ifm), flags);
1472 if (nlh == NULL)
1473 return -EMSGSIZE;
1474
1475 ifm = nlmsg_data(nlh);
1476 ifm->ifa_family = AF_INET;
1477 ifm->ifa_prefixlen = ifa->ifa_prefixlen;
1478 ifm->ifa_flags = ifa->ifa_flags;
1479 ifm->ifa_scope = ifa->ifa_scope;
1480 ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
1481
1482 if (!(ifm->ifa_flags & IFA_F_PERMANENT)) {
1483 preferred = ifa->ifa_preferred_lft;
1484 valid = ifa->ifa_valid_lft;
1485 if (preferred != INFINITY_LIFE_TIME) {
1486 long tval = (jiffies - ifa->ifa_tstamp) / HZ;
1487
1488 if (preferred > tval)
1489 preferred -= tval;
1490 else
1491 preferred = 0;
1492 if (valid != INFINITY_LIFE_TIME) {
1493 if (valid > tval)
1494 valid -= tval;
1495 else
1496 valid = 0;
1497 }
1498 }
1499 } else {
1500 preferred = INFINITY_LIFE_TIME;
1501 valid = INFINITY_LIFE_TIME;
1502 }
1503 if ((ifa->ifa_address &&
1504 nla_put_be32(skb, IFA_ADDRESS, ifa->ifa_address)) ||
1505 (ifa->ifa_local &&
1506 nla_put_be32(skb, IFA_LOCAL, ifa->ifa_local)) ||
1507 (ifa->ifa_broadcast &&
1508 nla_put_be32(skb, IFA_BROADCAST, ifa->ifa_broadcast)) ||
1509 (ifa->ifa_label[0] &&
1510 nla_put_string(skb, IFA_LABEL, ifa->ifa_label)) ||
1511 put_cacheinfo(skb, ifa->ifa_cstamp, ifa->ifa_tstamp,
1512 preferred, valid))
1513 goto nla_put_failure;
1514
1515 return nlmsg_end(skb, nlh);
1516
1517 nla_put_failure:
1518 nlmsg_cancel(skb, nlh);
1519 return -EMSGSIZE;
1520 }
1521
1522 static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
1523 {
1524 struct net *net = sock_net(skb->sk);
1525 int h, s_h;
1526 int idx, s_idx;
1527 int ip_idx, s_ip_idx;
1528 struct net_device *dev;
1529 struct in_device *in_dev;
1530 struct in_ifaddr *ifa;
1531 struct hlist_head *head;
1532
1533 s_h = cb->args[0];
1534 s_idx = idx = cb->args[1];
1535 s_ip_idx = ip_idx = cb->args[2];
1536
1537 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1538 idx = 0;
1539 head = &net->dev_index_head[h];
1540 rcu_read_lock();
1541 cb->seq = atomic_read(&net->ipv4.dev_addr_genid) ^
1542 net->dev_base_seq;
1543 hlist_for_each_entry_rcu(dev, head, index_hlist) {
1544 if (idx < s_idx)
1545 goto cont;
1546 if (h > s_h || idx > s_idx)
1547 s_ip_idx = 0;
1548 in_dev = __in_dev_get_rcu(dev);
1549 if (!in_dev)
1550 goto cont;
1551
1552 for (ifa = in_dev->ifa_list, ip_idx = 0; ifa;
1553 ifa = ifa->ifa_next, ip_idx++) {
1554 if (ip_idx < s_ip_idx)
1555 continue;
1556 if (inet_fill_ifaddr(skb, ifa,
1557 NETLINK_CB(cb->skb).portid,
1558 cb->nlh->nlmsg_seq,
1559 RTM_NEWADDR, NLM_F_MULTI) <= 0) {
1560 rcu_read_unlock();
1561 goto done;
1562 }
1563 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1564 }
1565 cont:
1566 idx++;
1567 }
1568 rcu_read_unlock();
1569 }
1570
1571 done:
1572 cb->args[0] = h;
1573 cb->args[1] = idx;
1574 cb->args[2] = ip_idx;
1575
1576 return skb->len;
1577 }
1578
1579 static void rtmsg_ifa(int event, struct in_ifaddr *ifa, struct nlmsghdr *nlh,
1580 u32 portid)
1581 {
1582 struct sk_buff *skb;
1583 u32 seq = nlh ? nlh->nlmsg_seq : 0;
1584 int err = -ENOBUFS;
1585 struct net *net;
1586
1587 net = dev_net(ifa->ifa_dev->dev);
1588 skb = nlmsg_new(inet_nlmsg_size(), GFP_KERNEL);
1589 if (skb == NULL)
1590 goto errout;
1591
1592 err = inet_fill_ifaddr(skb, ifa, portid, seq, event, 0);
1593 if (err < 0) {
1594 /* -EMSGSIZE implies BUG in inet_nlmsg_size() */
1595 WARN_ON(err == -EMSGSIZE);
1596 kfree_skb(skb);
1597 goto errout;
1598 }
1599 rtnl_notify(skb, net, portid, RTNLGRP_IPV4_IFADDR, nlh, GFP_KERNEL);
1600 return;
1601 errout:
1602 if (err < 0)
1603 rtnl_set_sk_err(net, RTNLGRP_IPV4_IFADDR, err);
1604 }
1605
1606 static size_t inet_get_link_af_size(const struct net_device *dev)
1607 {
1608 struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr);
1609
1610 if (!in_dev)
1611 return 0;
1612
1613 return nla_total_size(IPV4_DEVCONF_MAX * 4); /* IFLA_INET_CONF */
1614 }
1615
1616 static int inet_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
1617 {
1618 struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr);
1619 struct nlattr *nla;
1620 int i;
1621
1622 if (!in_dev)
1623 return -ENODATA;
1624
1625 nla = nla_reserve(skb, IFLA_INET_CONF, IPV4_DEVCONF_MAX * 4);
1626 if (nla == NULL)
1627 return -EMSGSIZE;
1628
1629 for (i = 0; i < IPV4_DEVCONF_MAX; i++)
1630 ((u32 *) nla_data(nla))[i] = in_dev->cnf.data[i];
1631
1632 return 0;
1633 }
1634
1635 static const struct nla_policy inet_af_policy[IFLA_INET_MAX+1] = {
1636 [IFLA_INET_CONF] = { .type = NLA_NESTED },
1637 };
1638
1639 static int inet_validate_link_af(const struct net_device *dev,
1640 const struct nlattr *nla)
1641 {
1642 struct nlattr *a, *tb[IFLA_INET_MAX+1];
1643 int err, rem;
1644
1645 if (dev && !__in_dev_get_rtnl(dev))
1646 return -EAFNOSUPPORT;
1647
1648 err = nla_parse_nested(tb, IFLA_INET_MAX, nla, inet_af_policy);
1649 if (err < 0)
1650 return err;
1651
1652 if (tb[IFLA_INET_CONF]) {
1653 nla_for_each_nested(a, tb[IFLA_INET_CONF], rem) {
1654 int cfgid = nla_type(a);
1655
1656 if (nla_len(a) < 4)
1657 return -EINVAL;
1658
1659 if (cfgid <= 0 || cfgid > IPV4_DEVCONF_MAX)
1660 return -EINVAL;
1661 }
1662 }
1663
1664 return 0;
1665 }
1666
1667 static int inet_set_link_af(struct net_device *dev, const struct nlattr *nla)
1668 {
1669 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1670 struct nlattr *a, *tb[IFLA_INET_MAX+1];
1671 int rem;
1672
1673 if (!in_dev)
1674 return -EAFNOSUPPORT;
1675
1676 if (nla_parse_nested(tb, IFLA_INET_MAX, nla, NULL) < 0)
1677 BUG();
1678
1679 if (tb[IFLA_INET_CONF]) {
1680 nla_for_each_nested(a, tb[IFLA_INET_CONF], rem)
1681 ipv4_devconf_set(in_dev, nla_type(a), nla_get_u32(a));
1682 }
1683
1684 return 0;
1685 }
1686
1687 static int inet_netconf_msgsize_devconf(int type)
1688 {
1689 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
1690 + nla_total_size(4); /* NETCONFA_IFINDEX */
1691
1692 /* type -1 is used for ALL */
1693 if (type == -1 || type == NETCONFA_FORWARDING)
1694 size += nla_total_size(4);
1695 if (type == -1 || type == NETCONFA_RP_FILTER)
1696 size += nla_total_size(4);
1697 if (type == -1 || type == NETCONFA_MC_FORWARDING)
1698 size += nla_total_size(4);
1699
1700 return size;
1701 }
1702
1703 static int inet_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
1704 struct ipv4_devconf *devconf, u32 portid,
1705 u32 seq, int event, unsigned int flags,
1706 int type)
1707 {
1708 struct nlmsghdr *nlh;
1709 struct netconfmsg *ncm;
1710
1711 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
1712 flags);
1713 if (nlh == NULL)
1714 return -EMSGSIZE;
1715
1716 ncm = nlmsg_data(nlh);
1717 ncm->ncm_family = AF_INET;
1718
1719 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
1720 goto nla_put_failure;
1721
1722 /* type -1 is used for ALL */
1723 if ((type == -1 || type == NETCONFA_FORWARDING) &&
1724 nla_put_s32(skb, NETCONFA_FORWARDING,
1725 IPV4_DEVCONF(*devconf, FORWARDING)) < 0)
1726 goto nla_put_failure;
1727 if ((type == -1 || type == NETCONFA_RP_FILTER) &&
1728 nla_put_s32(skb, NETCONFA_RP_FILTER,
1729 IPV4_DEVCONF(*devconf, RP_FILTER)) < 0)
1730 goto nla_put_failure;
1731 if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
1732 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
1733 IPV4_DEVCONF(*devconf, MC_FORWARDING)) < 0)
1734 goto nla_put_failure;
1735
1736 return nlmsg_end(skb, nlh);
1737
1738 nla_put_failure:
1739 nlmsg_cancel(skb, nlh);
1740 return -EMSGSIZE;
1741 }
1742
1743 void inet_netconf_notify_devconf(struct net *net, int type, int ifindex,
1744 struct ipv4_devconf *devconf)
1745 {
1746 struct sk_buff *skb;
1747 int err = -ENOBUFS;
1748
1749 skb = nlmsg_new(inet_netconf_msgsize_devconf(type), GFP_ATOMIC);
1750 if (skb == NULL)
1751 goto errout;
1752
1753 err = inet_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
1754 RTM_NEWNETCONF, 0, type);
1755 if (err < 0) {
1756 /* -EMSGSIZE implies BUG in inet_netconf_msgsize_devconf() */
1757 WARN_ON(err == -EMSGSIZE);
1758 kfree_skb(skb);
1759 goto errout;
1760 }
1761 rtnl_notify(skb, net, 0, RTNLGRP_IPV4_NETCONF, NULL, GFP_ATOMIC);
1762 return;
1763 errout:
1764 if (err < 0)
1765 rtnl_set_sk_err(net, RTNLGRP_IPV4_NETCONF, err);
1766 }
1767
1768 static const struct nla_policy devconf_ipv4_policy[NETCONFA_MAX+1] = {
1769 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
1770 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
1771 [NETCONFA_RP_FILTER] = { .len = sizeof(int) },
1772 };
1773
1774 static int inet_netconf_get_devconf(struct sk_buff *in_skb,
1775 struct nlmsghdr *nlh)
1776 {
1777 struct net *net = sock_net(in_skb->sk);
1778 struct nlattr *tb[NETCONFA_MAX+1];
1779 struct netconfmsg *ncm;
1780 struct sk_buff *skb;
1781 struct ipv4_devconf *devconf;
1782 struct in_device *in_dev;
1783 struct net_device *dev;
1784 int ifindex;
1785 int err;
1786
1787 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
1788 devconf_ipv4_policy);
1789 if (err < 0)
1790 goto errout;
1791
1792 err = -EINVAL;
1793 if (!tb[NETCONFA_IFINDEX])
1794 goto errout;
1795
1796 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
1797 switch (ifindex) {
1798 case NETCONFA_IFINDEX_ALL:
1799 devconf = net->ipv4.devconf_all;
1800 break;
1801 case NETCONFA_IFINDEX_DEFAULT:
1802 devconf = net->ipv4.devconf_dflt;
1803 break;
1804 default:
1805 dev = __dev_get_by_index(net, ifindex);
1806 if (dev == NULL)
1807 goto errout;
1808 in_dev = __in_dev_get_rtnl(dev);
1809 if (in_dev == NULL)
1810 goto errout;
1811 devconf = &in_dev->cnf;
1812 break;
1813 }
1814
1815 err = -ENOBUFS;
1816 skb = nlmsg_new(inet_netconf_msgsize_devconf(-1), GFP_ATOMIC);
1817 if (skb == NULL)
1818 goto errout;
1819
1820 err = inet_netconf_fill_devconf(skb, ifindex, devconf,
1821 NETLINK_CB(in_skb).portid,
1822 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
1823 -1);
1824 if (err < 0) {
1825 /* -EMSGSIZE implies BUG in inet_netconf_msgsize_devconf() */
1826 WARN_ON(err == -EMSGSIZE);
1827 kfree_skb(skb);
1828 goto errout;
1829 }
1830 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
1831 errout:
1832 return err;
1833 }
1834
1835 static int inet_netconf_dump_devconf(struct sk_buff *skb,
1836 struct netlink_callback *cb)
1837 {
1838 struct net *net = sock_net(skb->sk);
1839 int h, s_h;
1840 int idx, s_idx;
1841 struct net_device *dev;
1842 struct in_device *in_dev;
1843 struct hlist_head *head;
1844
1845 s_h = cb->args[0];
1846 s_idx = idx = cb->args[1];
1847
1848 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1849 idx = 0;
1850 head = &net->dev_index_head[h];
1851 rcu_read_lock();
1852 cb->seq = atomic_read(&net->ipv4.dev_addr_genid) ^
1853 net->dev_base_seq;
1854 hlist_for_each_entry_rcu(dev, head, index_hlist) {
1855 if (idx < s_idx)
1856 goto cont;
1857 in_dev = __in_dev_get_rcu(dev);
1858 if (!in_dev)
1859 goto cont;
1860
1861 if (inet_netconf_fill_devconf(skb, dev->ifindex,
1862 &in_dev->cnf,
1863 NETLINK_CB(cb->skb).portid,
1864 cb->nlh->nlmsg_seq,
1865 RTM_NEWNETCONF,
1866 NLM_F_MULTI,
1867 -1) <= 0) {
1868 rcu_read_unlock();
1869 goto done;
1870 }
1871 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1872 cont:
1873 idx++;
1874 }
1875 rcu_read_unlock();
1876 }
1877 if (h == NETDEV_HASHENTRIES) {
1878 if (inet_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
1879 net->ipv4.devconf_all,
1880 NETLINK_CB(cb->skb).portid,
1881 cb->nlh->nlmsg_seq,
1882 RTM_NEWNETCONF, NLM_F_MULTI,
1883 -1) <= 0)
1884 goto done;
1885 else
1886 h++;
1887 }
1888 if (h == NETDEV_HASHENTRIES + 1) {
1889 if (inet_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
1890 net->ipv4.devconf_dflt,
1891 NETLINK_CB(cb->skb).portid,
1892 cb->nlh->nlmsg_seq,
1893 RTM_NEWNETCONF, NLM_F_MULTI,
1894 -1) <= 0)
1895 goto done;
1896 else
1897 h++;
1898 }
1899 done:
1900 cb->args[0] = h;
1901 cb->args[1] = idx;
1902
1903 return skb->len;
1904 }
1905
1906 #ifdef CONFIG_SYSCTL
1907
1908 static void devinet_copy_dflt_conf(struct net *net, int i)
1909 {
1910 struct net_device *dev;
1911
1912 rcu_read_lock();
1913 for_each_netdev_rcu(net, dev) {
1914 struct in_device *in_dev;
1915
1916 in_dev = __in_dev_get_rcu(dev);
1917 if (in_dev && !test_bit(i, in_dev->cnf.state))
1918 in_dev->cnf.data[i] = net->ipv4.devconf_dflt->data[i];
1919 }
1920 rcu_read_unlock();
1921 }
1922
1923 /* called with RTNL locked */
1924 static void inet_forward_change(struct net *net)
1925 {
1926 struct net_device *dev;
1927 int on = IPV4_DEVCONF_ALL(net, FORWARDING);
1928
1929 IPV4_DEVCONF_ALL(net, ACCEPT_REDIRECTS) = !on;
1930 IPV4_DEVCONF_DFLT(net, FORWARDING) = on;
1931 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING,
1932 NETCONFA_IFINDEX_ALL,
1933 net->ipv4.devconf_all);
1934 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING,
1935 NETCONFA_IFINDEX_DEFAULT,
1936 net->ipv4.devconf_dflt);
1937
1938 for_each_netdev(net, dev) {
1939 struct in_device *in_dev;
1940 if (on)
1941 dev_disable_lro(dev);
1942 rcu_read_lock();
1943 in_dev = __in_dev_get_rcu(dev);
1944 if (in_dev) {
1945 IN_DEV_CONF_SET(in_dev, FORWARDING, on);
1946 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING,
1947 dev->ifindex, &in_dev->cnf);
1948 }
1949 rcu_read_unlock();
1950 }
1951 }
1952
1953 static int devinet_conf_proc(struct ctl_table *ctl, int write,
1954 void __user *buffer,
1955 size_t *lenp, loff_t *ppos)
1956 {
1957 int old_value = *(int *)ctl->data;
1958 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
1959 int new_value = *(int *)ctl->data;
1960
1961 if (write) {
1962 struct ipv4_devconf *cnf = ctl->extra1;
1963 struct net *net = ctl->extra2;
1964 int i = (int *)ctl->data - cnf->data;
1965
1966 set_bit(i, cnf->state);
1967
1968 if (cnf == net->ipv4.devconf_dflt)
1969 devinet_copy_dflt_conf(net, i);
1970 if (i == IPV4_DEVCONF_ACCEPT_LOCAL - 1 ||
1971 i == IPV4_DEVCONF_ROUTE_LOCALNET - 1)
1972 if ((new_value == 0) && (old_value != 0))
1973 rt_cache_flush(net);
1974 if (i == IPV4_DEVCONF_RP_FILTER - 1 &&
1975 new_value != old_value) {
1976 int ifindex;
1977
1978 if (cnf == net->ipv4.devconf_dflt)
1979 ifindex = NETCONFA_IFINDEX_DEFAULT;
1980 else if (cnf == net->ipv4.devconf_all)
1981 ifindex = NETCONFA_IFINDEX_ALL;
1982 else {
1983 struct in_device *idev =
1984 container_of(cnf, struct in_device,
1985 cnf);
1986 ifindex = idev->dev->ifindex;
1987 }
1988 inet_netconf_notify_devconf(net, NETCONFA_RP_FILTER,
1989 ifindex, cnf);
1990 }
1991 }
1992
1993 return ret;
1994 }
1995
1996 static int devinet_sysctl_forward(struct ctl_table *ctl, int write,
1997 void __user *buffer,
1998 size_t *lenp, loff_t *ppos)
1999 {
2000 int *valp = ctl->data;
2001 int val = *valp;
2002 loff_t pos = *ppos;
2003 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
2004
2005 if (write && *valp != val) {
2006 struct net *net = ctl->extra2;
2007
2008 if (valp != &IPV4_DEVCONF_DFLT(net, FORWARDING)) {
2009 if (!rtnl_trylock()) {
2010 /* Restore the original values before restarting */
2011 *valp = val;
2012 *ppos = pos;
2013 return restart_syscall();
2014 }
2015 if (valp == &IPV4_DEVCONF_ALL(net, FORWARDING)) {
2016 inet_forward_change(net);
2017 } else {
2018 struct ipv4_devconf *cnf = ctl->extra1;
2019 struct in_device *idev =
2020 container_of(cnf, struct in_device, cnf);
2021 if (*valp)
2022 dev_disable_lro(idev->dev);
2023 inet_netconf_notify_devconf(net,
2024 NETCONFA_FORWARDING,
2025 idev->dev->ifindex,
2026 cnf);
2027 }
2028 rtnl_unlock();
2029 rt_cache_flush(net);
2030 } else
2031 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING,
2032 NETCONFA_IFINDEX_DEFAULT,
2033 net->ipv4.devconf_dflt);
2034 }
2035
2036 return ret;
2037 }
2038
2039 static int ipv4_doint_and_flush(struct ctl_table *ctl, int write,
2040 void __user *buffer,
2041 size_t *lenp, loff_t *ppos)
2042 {
2043 int *valp = ctl->data;
2044 int val = *valp;
2045 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
2046 struct net *net = ctl->extra2;
2047
2048 if (write && *valp != val)
2049 rt_cache_flush(net);
2050
2051 return ret;
2052 }
2053
2054 #define DEVINET_SYSCTL_ENTRY(attr, name, mval, proc) \
2055 { \
2056 .procname = name, \
2057 .data = ipv4_devconf.data + \
2058 IPV4_DEVCONF_ ## attr - 1, \
2059 .maxlen = sizeof(int), \
2060 .mode = mval, \
2061 .proc_handler = proc, \
2062 .extra1 = &ipv4_devconf, \
2063 }
2064
2065 #define DEVINET_SYSCTL_RW_ENTRY(attr, name) \
2066 DEVINET_SYSCTL_ENTRY(attr, name, 0644, devinet_conf_proc)
2067
2068 #define DEVINET_SYSCTL_RO_ENTRY(attr, name) \
2069 DEVINET_SYSCTL_ENTRY(attr, name, 0444, devinet_conf_proc)
2070
2071 #define DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, proc) \
2072 DEVINET_SYSCTL_ENTRY(attr, name, 0644, proc)
2073
2074 #define DEVINET_SYSCTL_FLUSHING_ENTRY(attr, name) \
2075 DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, ipv4_doint_and_flush)
2076
2077 static struct devinet_sysctl_table {
2078 struct ctl_table_header *sysctl_header;
2079 struct ctl_table devinet_vars[__IPV4_DEVCONF_MAX];
2080 } devinet_sysctl = {
2081 .devinet_vars = {
2082 DEVINET_SYSCTL_COMPLEX_ENTRY(FORWARDING, "forwarding",
2083 devinet_sysctl_forward),
2084 DEVINET_SYSCTL_RO_ENTRY(MC_FORWARDING, "mc_forwarding"),
2085
2086 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_REDIRECTS, "accept_redirects"),
2087 DEVINET_SYSCTL_RW_ENTRY(SECURE_REDIRECTS, "secure_redirects"),
2088 DEVINET_SYSCTL_RW_ENTRY(SHARED_MEDIA, "shared_media"),
2089 DEVINET_SYSCTL_RW_ENTRY(RP_FILTER, "rp_filter"),
2090 DEVINET_SYSCTL_RW_ENTRY(SEND_REDIRECTS, "send_redirects"),
2091 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_SOURCE_ROUTE,
2092 "accept_source_route"),
2093 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_LOCAL, "accept_local"),
2094 DEVINET_SYSCTL_RW_ENTRY(SRC_VMARK, "src_valid_mark"),
2095 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP, "proxy_arp"),
2096 DEVINET_SYSCTL_RW_ENTRY(MEDIUM_ID, "medium_id"),
2097 DEVINET_SYSCTL_RW_ENTRY(BOOTP_RELAY, "bootp_relay"),
2098 DEVINET_SYSCTL_RW_ENTRY(LOG_MARTIANS, "log_martians"),
2099 DEVINET_SYSCTL_RW_ENTRY(TAG, "tag"),
2100 DEVINET_SYSCTL_RW_ENTRY(ARPFILTER, "arp_filter"),
2101 DEVINET_SYSCTL_RW_ENTRY(ARP_ANNOUNCE, "arp_announce"),
2102 DEVINET_SYSCTL_RW_ENTRY(ARP_IGNORE, "arp_ignore"),
2103 DEVINET_SYSCTL_RW_ENTRY(ARP_ACCEPT, "arp_accept"),
2104 DEVINET_SYSCTL_RW_ENTRY(ARP_NOTIFY, "arp_notify"),
2105 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP_PVLAN, "proxy_arp_pvlan"),
2106 DEVINET_SYSCTL_RW_ENTRY(FORCE_IGMP_VERSION,
2107 "force_igmp_version"),
2108 DEVINET_SYSCTL_RW_ENTRY(IGMPV2_UNSOLICITED_REPORT_INTERVAL,
2109 "igmpv2_unsolicited_report_interval"),
2110 DEVINET_SYSCTL_RW_ENTRY(IGMPV3_UNSOLICITED_REPORT_INTERVAL,
2111 "igmpv3_unsolicited_report_interval"),
2112
2113 DEVINET_SYSCTL_FLUSHING_ENTRY(NOXFRM, "disable_xfrm"),
2114 DEVINET_SYSCTL_FLUSHING_ENTRY(NOPOLICY, "disable_policy"),
2115 DEVINET_SYSCTL_FLUSHING_ENTRY(PROMOTE_SECONDARIES,
2116 "promote_secondaries"),
2117 DEVINET_SYSCTL_FLUSHING_ENTRY(ROUTE_LOCALNET,
2118 "route_localnet"),
2119 },
2120 };
2121
2122 static int __devinet_sysctl_register(struct net *net, char *dev_name,
2123 struct ipv4_devconf *p)
2124 {
2125 int i;
2126 struct devinet_sysctl_table *t;
2127 char path[sizeof("net/ipv4/conf/") + IFNAMSIZ];
2128
2129 t = kmemdup(&devinet_sysctl, sizeof(*t), GFP_KERNEL);
2130 if (!t)
2131 goto out;
2132
2133 for (i = 0; i < ARRAY_SIZE(t->devinet_vars) - 1; i++) {
2134 t->devinet_vars[i].data += (char *)p - (char *)&ipv4_devconf;
2135 t->devinet_vars[i].extra1 = p;
2136 t->devinet_vars[i].extra2 = net;
2137 }
2138
2139 snprintf(path, sizeof(path), "net/ipv4/conf/%s", dev_name);
2140
2141 t->sysctl_header = register_net_sysctl(net, path, t->devinet_vars);
2142 if (!t->sysctl_header)
2143 goto free;
2144
2145 p->sysctl = t;
2146 return 0;
2147
2148 free:
2149 kfree(t);
2150 out:
2151 return -ENOBUFS;
2152 }
2153
2154 static void __devinet_sysctl_unregister(struct ipv4_devconf *cnf)
2155 {
2156 struct devinet_sysctl_table *t = cnf->sysctl;
2157
2158 if (t == NULL)
2159 return;
2160
2161 cnf->sysctl = NULL;
2162 unregister_net_sysctl_table(t->sysctl_header);
2163 kfree(t);
2164 }
2165
2166 static void devinet_sysctl_register(struct in_device *idev)
2167 {
2168 neigh_sysctl_register(idev->dev, idev->arp_parms, "ipv4", NULL);
2169 __devinet_sysctl_register(dev_net(idev->dev), idev->dev->name,
2170 &idev->cnf);
2171 }
2172
2173 static void devinet_sysctl_unregister(struct in_device *idev)
2174 {
2175 __devinet_sysctl_unregister(&idev->cnf);
2176 neigh_sysctl_unregister(idev->arp_parms);
2177 }
2178
2179 static struct ctl_table ctl_forward_entry[] = {
2180 {
2181 .procname = "ip_forward",
2182 .data = &ipv4_devconf.data[
2183 IPV4_DEVCONF_FORWARDING - 1],
2184 .maxlen = sizeof(int),
2185 .mode = 0644,
2186 .proc_handler = devinet_sysctl_forward,
2187 .extra1 = &ipv4_devconf,
2188 .extra2 = &init_net,
2189 },
2190 { },
2191 };
2192 #endif
2193
2194 static __net_init int devinet_init_net(struct net *net)
2195 {
2196 int err;
2197 struct ipv4_devconf *all, *dflt;
2198 #ifdef CONFIG_SYSCTL
2199 struct ctl_table *tbl = ctl_forward_entry;
2200 struct ctl_table_header *forw_hdr;
2201 #endif
2202
2203 err = -ENOMEM;
2204 all = &ipv4_devconf;
2205 dflt = &ipv4_devconf_dflt;
2206
2207 if (!net_eq(net, &init_net)) {
2208 all = kmemdup(all, sizeof(ipv4_devconf), GFP_KERNEL);
2209 if (all == NULL)
2210 goto err_alloc_all;
2211
2212 dflt = kmemdup(dflt, sizeof(ipv4_devconf_dflt), GFP_KERNEL);
2213 if (dflt == NULL)
2214 goto err_alloc_dflt;
2215
2216 #ifdef CONFIG_SYSCTL
2217 tbl = kmemdup(tbl, sizeof(ctl_forward_entry), GFP_KERNEL);
2218 if (tbl == NULL)
2219 goto err_alloc_ctl;
2220
2221 tbl[0].data = &all->data[IPV4_DEVCONF_FORWARDING - 1];
2222 tbl[0].extra1 = all;
2223 tbl[0].extra2 = net;
2224 #endif
2225 }
2226
2227 #ifdef CONFIG_SYSCTL
2228 err = __devinet_sysctl_register(net, "all", all);
2229 if (err < 0)
2230 goto err_reg_all;
2231
2232 err = __devinet_sysctl_register(net, "default", dflt);
2233 if (err < 0)
2234 goto err_reg_dflt;
2235
2236 err = -ENOMEM;
2237 forw_hdr = register_net_sysctl(net, "net/ipv4", tbl);
2238 if (forw_hdr == NULL)
2239 goto err_reg_ctl;
2240 net->ipv4.forw_hdr = forw_hdr;
2241 #endif
2242
2243 net->ipv4.devconf_all = all;
2244 net->ipv4.devconf_dflt = dflt;
2245 return 0;
2246
2247 #ifdef CONFIG_SYSCTL
2248 err_reg_ctl:
2249 __devinet_sysctl_unregister(dflt);
2250 err_reg_dflt:
2251 __devinet_sysctl_unregister(all);
2252 err_reg_all:
2253 if (tbl != ctl_forward_entry)
2254 kfree(tbl);
2255 err_alloc_ctl:
2256 #endif
2257 if (dflt != &ipv4_devconf_dflt)
2258 kfree(dflt);
2259 err_alloc_dflt:
2260 if (all != &ipv4_devconf)
2261 kfree(all);
2262 err_alloc_all:
2263 return err;
2264 }
2265
2266 static __net_exit void devinet_exit_net(struct net *net)
2267 {
2268 #ifdef CONFIG_SYSCTL
2269 struct ctl_table *tbl;
2270
2271 tbl = net->ipv4.forw_hdr->ctl_table_arg;
2272 unregister_net_sysctl_table(net->ipv4.forw_hdr);
2273 __devinet_sysctl_unregister(net->ipv4.devconf_dflt);
2274 __devinet_sysctl_unregister(net->ipv4.devconf_all);
2275 kfree(tbl);
2276 #endif
2277 kfree(net->ipv4.devconf_dflt);
2278 kfree(net->ipv4.devconf_all);
2279 }
2280
2281 static __net_initdata struct pernet_operations devinet_ops = {
2282 .init = devinet_init_net,
2283 .exit = devinet_exit_net,
2284 };
2285
2286 static struct rtnl_af_ops inet_af_ops = {
2287 .family = AF_INET,
2288 .fill_link_af = inet_fill_link_af,
2289 .get_link_af_size = inet_get_link_af_size,
2290 .validate_link_af = inet_validate_link_af,
2291 .set_link_af = inet_set_link_af,
2292 };
2293
2294 void __init devinet_init(void)
2295 {
2296 int i;
2297
2298 for (i = 0; i < IN4_ADDR_HSIZE; i++)
2299 INIT_HLIST_HEAD(&inet_addr_lst[i]);
2300
2301 register_pernet_subsys(&devinet_ops);
2302
2303 register_gifconf(PF_INET, inet_gifconf);
2304 register_netdevice_notifier(&ip_netdev_notifier);
2305
2306 schedule_delayed_work(&check_lifetime_work, 0);
2307
2308 rtnl_af_register(&inet_af_ops);
2309
2310 rtnl_register(PF_INET, RTM_NEWADDR, inet_rtm_newaddr, NULL, NULL);
2311 rtnl_register(PF_INET, RTM_DELADDR, inet_rtm_deladdr, NULL, NULL);
2312 rtnl_register(PF_INET, RTM_GETADDR, NULL, inet_dump_ifaddr, NULL);
2313 rtnl_register(PF_INET, RTM_GETNETCONF, inet_netconf_get_devconf,
2314 inet_netconf_dump_devconf, NULL);
2315 }
2316
Linux with added FPC-III support