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