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Merge branch 'for-3.11' of git://linux-nfs.org/~bfields/linux
[linux-2.6.git] / net / ipv4 / devinet.c
blob8d48c392adccec6dc1f2ca8e3c8fd5a6750283e5
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 },
77 };
78
79 static struct ipv4_devconf ipv4_devconf_dflt = {
80 .data = {
81 [IPV4_DEVCONF_ACCEPT_REDIRECTS - 1] = 1,
82 [IPV4_DEVCONF_SEND_REDIRECTS - 1] = 1,
83 [IPV4_DEVCONF_SECURE_REDIRECTS - 1] = 1,
84 [IPV4_DEVCONF_SHARED_MEDIA - 1] = 1,
85 [IPV4_DEVCONF_ACCEPT_SOURCE_ROUTE - 1] = 1,
86 },
87 };
88
89 #define IPV4_DEVCONF_DFLT(net, attr) \
90 IPV4_DEVCONF((*net->ipv4.devconf_dflt), attr)
91
92 static const struct nla_policy ifa_ipv4_policy[IFA_MAX+1] = {
93 [IFA_LOCAL] = { .type = NLA_U32 },
94 [IFA_ADDRESS] = { .type = NLA_U32 },
95 [IFA_BROADCAST] = { .type = NLA_U32 },
96 [IFA_LABEL] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 },
97 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
98 };
99
100 #define IN4_ADDR_HSIZE_SHIFT 8
101 #define IN4_ADDR_HSIZE (1U << IN4_ADDR_HSIZE_SHIFT)
102
103 static struct hlist_head inet_addr_lst[IN4_ADDR_HSIZE];
104 static DEFINE_SPINLOCK(inet_addr_hash_lock);
105
106 static u32 inet_addr_hash(struct net *net, __be32 addr)
107 {
108 u32 val = (__force u32) addr ^ net_hash_mix(net);
109
110 return hash_32(val, IN4_ADDR_HSIZE_SHIFT);
111 }
112
113 static void inet_hash_insert(struct net *net, struct in_ifaddr *ifa)
114 {
115 u32 hash = inet_addr_hash(net, ifa->ifa_local);
116
117 spin_lock(&inet_addr_hash_lock);
118 hlist_add_head_rcu(&ifa->hash, &inet_addr_lst[hash]);
119 spin_unlock(&inet_addr_hash_lock);
120 }
121
122 static void inet_hash_remove(struct in_ifaddr *ifa)
123 {
124 spin_lock(&inet_addr_hash_lock);
125 hlist_del_init_rcu(&ifa->hash);
126 spin_unlock(&inet_addr_hash_lock);
127 }
128
129 /**
130 * __ip_dev_find - find the first device with a given source address.
131 * @net: the net namespace
132 * @addr: the source address
133 * @devref: if true, take a reference on the found device
134 *
135 * If a caller uses devref=false, it should be protected by RCU, or RTNL
136 */
137 struct net_device *__ip_dev_find(struct net *net, __be32 addr, bool devref)
138 {
139 u32 hash = inet_addr_hash(net, addr);
140 struct net_device *result = NULL;
141 struct in_ifaddr *ifa;
142
143 rcu_read_lock();
144 hlist_for_each_entry_rcu(ifa, &inet_addr_lst[hash], hash) {
145 if (ifa->ifa_local == addr) {
146 struct net_device *dev = ifa->ifa_dev->dev;
147
148 if (!net_eq(dev_net(dev), net))
149 continue;
150 result = dev;
151 break;
152 }
153 }
154 if (!result) {
155 struct flowi4 fl4 = { .daddr = addr };
156 struct fib_result res = { 0 };
157 struct fib_table *local;
158
159 /* Fallback to FIB local table so that communication
160 * over loopback subnets work.
161 */
162 local = fib_get_table(net, RT_TABLE_LOCAL);
163 if (local &&
164 !fib_table_lookup(local, &fl4, &res, FIB_LOOKUP_NOREF) &&
165 res.type == RTN_LOCAL)
166 result = FIB_RES_DEV(res);
167 }
168 if (result && devref)
169 dev_hold(result);
170 rcu_read_unlock();
171 return result;
172 }
173 EXPORT_SYMBOL(__ip_dev_find);
174
175 static void rtmsg_ifa(int event, struct in_ifaddr *, struct nlmsghdr *, u32);
176
177 static BLOCKING_NOTIFIER_HEAD(inetaddr_chain);
178 static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
179 int destroy);
180 #ifdef CONFIG_SYSCTL
181 static void devinet_sysctl_register(struct in_device *idev);
182 static void devinet_sysctl_unregister(struct in_device *idev);
183 #else
184 static void devinet_sysctl_register(struct in_device *idev)
185 {
186 }
187 static void devinet_sysctl_unregister(struct in_device *idev)
188 {
189 }
190 #endif
191
192 /* Locks all the inet devices. */
193
194 static struct in_ifaddr *inet_alloc_ifa(void)
195 {
196 return kzalloc(sizeof(struct in_ifaddr), GFP_KERNEL);
197 }
198
199 static void inet_rcu_free_ifa(struct rcu_head *head)
200 {
201 struct in_ifaddr *ifa = container_of(head, struct in_ifaddr, rcu_head);
202 if (ifa->ifa_dev)
203 in_dev_put(ifa->ifa_dev);
204 kfree(ifa);
205 }
206
207 static void inet_free_ifa(struct in_ifaddr *ifa)
208 {
209 call_rcu(&ifa->rcu_head, inet_rcu_free_ifa);
210 }
211
212 void in_dev_finish_destroy(struct in_device *idev)
213 {
214 struct net_device *dev = idev->dev;
215
216 WARN_ON(idev->ifa_list);
217 WARN_ON(idev->mc_list);
218 kfree(rcu_dereference_protected(idev->mc_hash, 1));
219 #ifdef NET_REFCNT_DEBUG
220 pr_debug("%s: %p=%s\n", __func__, idev, dev ? dev->name : "NIL");
221 #endif
222 dev_put(dev);
223 if (!idev->dead)
224 pr_err("Freeing alive in_device %p\n", idev);
225 else
226 kfree(idev);
227 }
228 EXPORT_SYMBOL(in_dev_finish_destroy);
229
230 static struct in_device *inetdev_init(struct net_device *dev)
231 {
232 struct in_device *in_dev;
233
234 ASSERT_RTNL();
235
236 in_dev = kzalloc(sizeof(*in_dev), GFP_KERNEL);
237 if (!in_dev)
238 goto out;
239 memcpy(&in_dev->cnf, dev_net(dev)->ipv4.devconf_dflt,
240 sizeof(in_dev->cnf));
241 in_dev->cnf.sysctl = NULL;
242 in_dev->dev = dev;
243 in_dev->arp_parms = neigh_parms_alloc(dev, &arp_tbl);
244 if (!in_dev->arp_parms)
245 goto out_kfree;
246 if (IPV4_DEVCONF(in_dev->cnf, FORWARDING))
247 dev_disable_lro(dev);
248 /* Reference in_dev->dev */
249 dev_hold(dev);
250 /* Account for reference dev->ip_ptr (below) */
251 in_dev_hold(in_dev);
252
253 devinet_sysctl_register(in_dev);
254 ip_mc_init_dev(in_dev);
255 if (dev->flags & IFF_UP)
256 ip_mc_up(in_dev);
257
258 /* we can receive as soon as ip_ptr is set -- do this last */
259 rcu_assign_pointer(dev->ip_ptr, in_dev);
260 out:
261 return in_dev;
262 out_kfree:
263 kfree(in_dev);
264 in_dev = NULL;
265 goto out;
266 }
267
268 static void in_dev_rcu_put(struct rcu_head *head)
269 {
270 struct in_device *idev = container_of(head, struct in_device, rcu_head);
271 in_dev_put(idev);
272 }
273
274 static void inetdev_destroy(struct in_device *in_dev)
275 {
276 struct in_ifaddr *ifa;
277 struct net_device *dev;
278
279 ASSERT_RTNL();
280
281 dev = in_dev->dev;
282
283 in_dev->dead = 1;
284
285 ip_mc_destroy_dev(in_dev);
286
287 while ((ifa = in_dev->ifa_list) != NULL) {
288 inet_del_ifa(in_dev, &in_dev->ifa_list, 0);
289 inet_free_ifa(ifa);
290 }
291
292 RCU_INIT_POINTER(dev->ip_ptr, NULL);
293
294 devinet_sysctl_unregister(in_dev);
295 neigh_parms_release(&arp_tbl, in_dev->arp_parms);
296 arp_ifdown(dev);
297
298 call_rcu(&in_dev->rcu_head, in_dev_rcu_put);
299 }
300
301 int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b)
302 {
303 rcu_read_lock();
304 for_primary_ifa(in_dev) {
305 if (inet_ifa_match(a, ifa)) {
306 if (!b || inet_ifa_match(b, ifa)) {
307 rcu_read_unlock();
308 return 1;
309 }
310 }
311 } endfor_ifa(in_dev);
312 rcu_read_unlock();
313 return 0;
314 }
315
316 static void __inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
317 int destroy, struct nlmsghdr *nlh, u32 portid)
318 {
319 struct in_ifaddr *promote = NULL;
320 struct in_ifaddr *ifa, *ifa1 = *ifap;
321 struct in_ifaddr *last_prim = in_dev->ifa_list;
322 struct in_ifaddr *prev_prom = NULL;
323 int do_promote = IN_DEV_PROMOTE_SECONDARIES(in_dev);
324
325 ASSERT_RTNL();
326
327 /* 1. Deleting primary ifaddr forces deletion all secondaries
328 * unless alias promotion is set
329 **/
330
331 if (!(ifa1->ifa_flags & IFA_F_SECONDARY)) {
332 struct in_ifaddr **ifap1 = &ifa1->ifa_next;
333
334 while ((ifa = *ifap1) != NULL) {
335 if (!(ifa->ifa_flags & IFA_F_SECONDARY) &&
336 ifa1->ifa_scope <= ifa->ifa_scope)
337 last_prim = ifa;
338
339 if (!(ifa->ifa_flags & IFA_F_SECONDARY) ||
340 ifa1->ifa_mask != ifa->ifa_mask ||
341 !inet_ifa_match(ifa1->ifa_address, ifa)) {
342 ifap1 = &ifa->ifa_next;
343 prev_prom = ifa;
344 continue;
345 }
346
347 if (!do_promote) {
348 inet_hash_remove(ifa);
349 *ifap1 = ifa->ifa_next;
350
351 rtmsg_ifa(RTM_DELADDR, ifa, nlh, portid);
352 blocking_notifier_call_chain(&inetaddr_chain,
353 NETDEV_DOWN, ifa);
354 inet_free_ifa(ifa);
355 } else {
356 promote = ifa;
357 break;
358 }
359 }
360 }
361
362 /* On promotion all secondaries from subnet are changing
363 * the primary IP, we must remove all their routes silently
364 * and later to add them back with new prefsrc. Do this
365 * while all addresses are on the device list.
366 */
367 for (ifa = promote; ifa; ifa = ifa->ifa_next) {
368 if (ifa1->ifa_mask == ifa->ifa_mask &&
369 inet_ifa_match(ifa1->ifa_address, ifa))
370 fib_del_ifaddr(ifa, ifa1);
371 }
372
373 /* 2. Unlink it */
374
375 *ifap = ifa1->ifa_next;
376 inet_hash_remove(ifa1);
377
378 /* 3. Announce address deletion */
379
380 /* Send message first, then call notifier.
381 At first sight, FIB update triggered by notifier
382 will refer to already deleted ifaddr, that could confuse
383 netlink listeners. It is not true: look, gated sees
384 that route deleted and if it still thinks that ifaddr
385 is valid, it will try to restore deleted routes... Grr.
386 So that, this order is correct.
387 */
388 rtmsg_ifa(RTM_DELADDR, ifa1, nlh, portid);
389 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa1);
390
391 if (promote) {
392 struct in_ifaddr *next_sec = promote->ifa_next;
393
394 if (prev_prom) {
395 prev_prom->ifa_next = promote->ifa_next;
396 promote->ifa_next = last_prim->ifa_next;
397 last_prim->ifa_next = promote;
398 }
399
400 promote->ifa_flags &= ~IFA_F_SECONDARY;
401 rtmsg_ifa(RTM_NEWADDR, promote, nlh, portid);
402 blocking_notifier_call_chain(&inetaddr_chain,
403 NETDEV_UP, promote);
404 for (ifa = next_sec; ifa; ifa = ifa->ifa_next) {
405 if (ifa1->ifa_mask != ifa->ifa_mask ||
406 !inet_ifa_match(ifa1->ifa_address, ifa))
407 continue;
408 fib_add_ifaddr(ifa);
409 }
410
411 }
412 if (destroy)
413 inet_free_ifa(ifa1);
414 }
415
416 static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
417 int destroy)
418 {
419 __inet_del_ifa(in_dev, ifap, destroy, NULL, 0);
420 }
421
422 static void check_lifetime(struct work_struct *work);
423
424 static DECLARE_DELAYED_WORK(check_lifetime_work, check_lifetime);
425
426 static int __inet_insert_ifa(struct in_ifaddr *ifa, struct nlmsghdr *nlh,
427 u32 portid)
428 {
429 struct in_device *in_dev = ifa->ifa_dev;
430 struct in_ifaddr *ifa1, **ifap, **last_primary;
431
432 ASSERT_RTNL();
433
434 if (!ifa->ifa_local) {
435 inet_free_ifa(ifa);
436 return 0;
437 }
438
439 ifa->ifa_flags &= ~IFA_F_SECONDARY;
440 last_primary = &in_dev->ifa_list;
441
442 for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL;
443 ifap = &ifa1->ifa_next) {
444 if (!(ifa1->ifa_flags & IFA_F_SECONDARY) &&
445 ifa->ifa_scope <= ifa1->ifa_scope)
446 last_primary = &ifa1->ifa_next;
447 if (ifa1->ifa_mask == ifa->ifa_mask &&
448 inet_ifa_match(ifa1->ifa_address, ifa)) {
449 if (ifa1->ifa_local == ifa->ifa_local) {
450 inet_free_ifa(ifa);
451 return -EEXIST;
452 }
453 if (ifa1->ifa_scope != ifa->ifa_scope) {
454 inet_free_ifa(ifa);
455 return -EINVAL;
456 }
457 ifa->ifa_flags |= IFA_F_SECONDARY;
458 }
459 }
460
461 if (!(ifa->ifa_flags & IFA_F_SECONDARY)) {
462 net_srandom(ifa->ifa_local);
463 ifap = last_primary;
464 }
465
466 ifa->ifa_next = *ifap;
467 *ifap = ifa;
468
469 inet_hash_insert(dev_net(in_dev->dev), ifa);
470
471 cancel_delayed_work(&check_lifetime_work);
472 schedule_delayed_work(&check_lifetime_work, 0);
473
474 /* Send message first, then call notifier.
475 Notifier will trigger FIB update, so that
476 listeners of netlink will know about new ifaddr */
477 rtmsg_ifa(RTM_NEWADDR, ifa, nlh, portid);
478 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa);
479
480 return 0;
481 }
482
483 static int inet_insert_ifa(struct in_ifaddr *ifa)
484 {
485 return __inet_insert_ifa(ifa, NULL, 0);
486 }
487
488 static int inet_set_ifa(struct net_device *dev, struct in_ifaddr *ifa)
489 {
490 struct in_device *in_dev = __in_dev_get_rtnl(dev);
491
492 ASSERT_RTNL();
493
494 if (!in_dev) {
495 inet_free_ifa(ifa);
496 return -ENOBUFS;
497 }
498 ipv4_devconf_setall(in_dev);
499 if (ifa->ifa_dev != in_dev) {
500 WARN_ON(ifa->ifa_dev);
501 in_dev_hold(in_dev);
502 ifa->ifa_dev = in_dev;
503 }
504 if (ipv4_is_loopback(ifa->ifa_local))
505 ifa->ifa_scope = RT_SCOPE_HOST;
506 return inet_insert_ifa(ifa);
507 }
508
509 /* Caller must hold RCU or RTNL :
510 * We dont take a reference on found in_device
511 */
512 struct in_device *inetdev_by_index(struct net *net, int ifindex)
513 {
514 struct net_device *dev;
515 struct in_device *in_dev = NULL;
516
517 rcu_read_lock();
518 dev = dev_get_by_index_rcu(net, ifindex);
519 if (dev)
520 in_dev = rcu_dereference_rtnl(dev->ip_ptr);
521 rcu_read_unlock();
522 return in_dev;
523 }
524 EXPORT_SYMBOL(inetdev_by_index);
525
526 /* Called only from RTNL semaphored context. No locks. */
527
528 struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix,
529 __be32 mask)
530 {
531 ASSERT_RTNL();
532
533 for_primary_ifa(in_dev) {
534 if (ifa->ifa_mask == mask && inet_ifa_match(prefix, ifa))
535 return ifa;
536 } endfor_ifa(in_dev);
537 return NULL;
538 }
539
540 static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
541 {
542 struct net *net = sock_net(skb->sk);
543 struct nlattr *tb[IFA_MAX+1];
544 struct in_device *in_dev;
545 struct ifaddrmsg *ifm;
546 struct in_ifaddr *ifa, **ifap;
547 int err = -EINVAL;
548
549 ASSERT_RTNL();
550
551 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy);
552 if (err < 0)
553 goto errout;
554
555 ifm = nlmsg_data(nlh);
556 in_dev = inetdev_by_index(net, ifm->ifa_index);
557 if (in_dev == NULL) {
558 err = -ENODEV;
559 goto errout;
560 }
561
562 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
563 ifap = &ifa->ifa_next) {
564 if (tb[IFA_LOCAL] &&
565 ifa->ifa_local != nla_get_be32(tb[IFA_LOCAL]))
566 continue;
567
568 if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label))
569 continue;
570
571 if (tb[IFA_ADDRESS] &&
572 (ifm->ifa_prefixlen != ifa->ifa_prefixlen ||
573 !inet_ifa_match(nla_get_be32(tb[IFA_ADDRESS]), ifa)))
574 continue;
575
576 __inet_del_ifa(in_dev, ifap, 1, nlh, NETLINK_CB(skb).portid);
577 return 0;
578 }
579
580 err = -EADDRNOTAVAIL;
581 errout:
582 return err;
583 }
584
585 #define INFINITY_LIFE_TIME 0xFFFFFFFF
586
587 static void check_lifetime(struct work_struct *work)
588 {
589 unsigned long now, next, next_sec, next_sched;
590 struct in_ifaddr *ifa;
591 struct hlist_node *n;
592 int i;
593
594 now = jiffies;
595 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
596
597 for (i = 0; i < IN4_ADDR_HSIZE; i++) {
598 bool change_needed = false;
599
600 rcu_read_lock();
601 hlist_for_each_entry_rcu(ifa, &inet_addr_lst[i], hash) {
602 unsigned long age;
603
604 if (ifa->ifa_flags & IFA_F_PERMANENT)
605 continue;
606
607 /* We try to batch several events at once. */
608 age = (now - ifa->ifa_tstamp +
609 ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
610
611 if (ifa->ifa_valid_lft != INFINITY_LIFE_TIME &&
612 age >= ifa->ifa_valid_lft) {
613 change_needed = true;
614 } else if (ifa->ifa_preferred_lft ==
615 INFINITY_LIFE_TIME) {
616 continue;
617 } else if (age >= ifa->ifa_preferred_lft) {
618 if (time_before(ifa->ifa_tstamp +
619 ifa->ifa_valid_lft * HZ, next))
620 next = ifa->ifa_tstamp +
621 ifa->ifa_valid_lft * HZ;
622
623 if (!(ifa->ifa_flags & IFA_F_DEPRECATED))
624 change_needed = true;
625 } else if (time_before(ifa->ifa_tstamp +
626 ifa->ifa_preferred_lft * HZ,
627 next)) {
628 next = ifa->ifa_tstamp +
629 ifa->ifa_preferred_lft * HZ;
630 }
631 }
632 rcu_read_unlock();
633 if (!change_needed)
634 continue;
635 rtnl_lock();
636 hlist_for_each_entry_safe(ifa, n, &inet_addr_lst[i], hash) {
637 unsigned long age;
638
639 if (ifa->ifa_flags & IFA_F_PERMANENT)
640 continue;
641
642 /* We try to batch several events at once. */
643 age = (now - ifa->ifa_tstamp +
644 ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
645
646 if (ifa->ifa_valid_lft != INFINITY_LIFE_TIME &&
647 age >= ifa->ifa_valid_lft) {
648 struct in_ifaddr **ifap;
649
650 for (ifap = &ifa->ifa_dev->ifa_list;
651 *ifap != NULL; ifap = &(*ifap)->ifa_next) {
652 if (*ifap == ifa) {
653 inet_del_ifa(ifa->ifa_dev,
654 ifap, 1);
655 break;
656 }
657 }
658 } else if (ifa->ifa_preferred_lft !=
659 INFINITY_LIFE_TIME &&
660 age >= ifa->ifa_preferred_lft &&
661 !(ifa->ifa_flags & IFA_F_DEPRECATED)) {
662 ifa->ifa_flags |= IFA_F_DEPRECATED;
663 rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0);
664 }
665 }
666 rtnl_unlock();
667 }
668
669 next_sec = round_jiffies_up(next);
670 next_sched = next;
671
672 /* If rounded timeout is accurate enough, accept it. */
673 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
674 next_sched = next_sec;
675
676 now = jiffies;
677 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
678 if (time_before(next_sched, now + ADDRCONF_TIMER_FUZZ_MAX))
679 next_sched = now + ADDRCONF_TIMER_FUZZ_MAX;
680
681 schedule_delayed_work(&check_lifetime_work, next_sched - now);
682 }
683
684 static void set_ifa_lifetime(struct in_ifaddr *ifa, __u32 valid_lft,
685 __u32 prefered_lft)
686 {
687 unsigned long timeout;
688
689 ifa->ifa_flags &= ~(IFA_F_PERMANENT | IFA_F_DEPRECATED);
690
691 timeout = addrconf_timeout_fixup(valid_lft, HZ);
692 if (addrconf_finite_timeout(timeout))
693 ifa->ifa_valid_lft = timeout;
694 else
695 ifa->ifa_flags |= IFA_F_PERMANENT;
696
697 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
698 if (addrconf_finite_timeout(timeout)) {
699 if (timeout == 0)
700 ifa->ifa_flags |= IFA_F_DEPRECATED;
701 ifa->ifa_preferred_lft = timeout;
702 }
703 ifa->ifa_tstamp = jiffies;
704 if (!ifa->ifa_cstamp)
705 ifa->ifa_cstamp = ifa->ifa_tstamp;
706 }
707
708 static struct in_ifaddr *rtm_to_ifaddr(struct net *net, struct nlmsghdr *nlh,
709 __u32 *pvalid_lft, __u32 *pprefered_lft)
710 {
711 struct nlattr *tb[IFA_MAX+1];
712 struct in_ifaddr *ifa;
713 struct ifaddrmsg *ifm;
714 struct net_device *dev;
715 struct in_device *in_dev;
716 int err;
717
718 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy);
719 if (err < 0)
720 goto errout;
721
722 ifm = nlmsg_data(nlh);
723 err = -EINVAL;
724 if (ifm->ifa_prefixlen > 32 || tb[IFA_LOCAL] == NULL)
725 goto errout;
726
727 dev = __dev_get_by_index(net, ifm->ifa_index);
728 err = -ENODEV;
729 if (dev == NULL)
730 goto errout;
731
732 in_dev = __in_dev_get_rtnl(dev);
733 err = -ENOBUFS;
734 if (in_dev == NULL)
735 goto errout;
736
737 ifa = inet_alloc_ifa();
738 if (ifa == NULL)
739 /*
740 * A potential indev allocation can be left alive, it stays
741 * assigned to its device and is destroy with it.
742 */
743 goto errout;
744
745 ipv4_devconf_setall(in_dev);
746 in_dev_hold(in_dev);
747
748 if (tb[IFA_ADDRESS] == NULL)
749 tb[IFA_ADDRESS] = tb[IFA_LOCAL];
750
751 INIT_HLIST_NODE(&ifa->hash);
752 ifa->ifa_prefixlen = ifm->ifa_prefixlen;
753 ifa->ifa_mask = inet_make_mask(ifm->ifa_prefixlen);
754 ifa->ifa_flags = ifm->ifa_flags;
755 ifa->ifa_scope = ifm->ifa_scope;
756 ifa->ifa_dev = in_dev;
757
758 ifa->ifa_local = nla_get_be32(tb[IFA_LOCAL]);
759 ifa->ifa_address = nla_get_be32(tb[IFA_ADDRESS]);
760
761 if (tb[IFA_BROADCAST])
762 ifa->ifa_broadcast = nla_get_be32(tb[IFA_BROADCAST]);
763
764 if (tb[IFA_LABEL])
765 nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ);
766 else
767 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
768
769 if (tb[IFA_CACHEINFO]) {
770 struct ifa_cacheinfo *ci;
771
772 ci = nla_data(tb[IFA_CACHEINFO]);
773 if (!ci->ifa_valid || ci->ifa_prefered > ci->ifa_valid) {
774 err = -EINVAL;
775 goto errout;
776 }
777 *pvalid_lft = ci->ifa_valid;
778 *pprefered_lft = ci->ifa_prefered;
779 }
780
781 return ifa;
782
783 errout:
784 return ERR_PTR(err);
785 }
786
787 static struct in_ifaddr *find_matching_ifa(struct in_ifaddr *ifa)
788 {
789 struct in_device *in_dev = ifa->ifa_dev;
790 struct in_ifaddr *ifa1, **ifap;
791
792 if (!ifa->ifa_local)
793 return NULL;
794
795 for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL;
796 ifap = &ifa1->ifa_next) {
797 if (ifa1->ifa_mask == ifa->ifa_mask &&
798 inet_ifa_match(ifa1->ifa_address, ifa) &&
799 ifa1->ifa_local == ifa->ifa_local)
800 return ifa1;
801 }
802 return NULL;
803 }
804
805 static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
806 {
807 struct net *net = sock_net(skb->sk);
808 struct in_ifaddr *ifa;
809 struct in_ifaddr *ifa_existing;
810 __u32 valid_lft = INFINITY_LIFE_TIME;
811 __u32 prefered_lft = INFINITY_LIFE_TIME;
812
813 ASSERT_RTNL();
814
815 ifa = rtm_to_ifaddr(net, nlh, &valid_lft, &prefered_lft);
816 if (IS_ERR(ifa))
817 return PTR_ERR(ifa);
818
819 ifa_existing = find_matching_ifa(ifa);
820 if (!ifa_existing) {
821 /* It would be best to check for !NLM_F_CREATE here but
822 * userspace alreay relies on not having to provide this.
823 */
824 set_ifa_lifetime(ifa, valid_lft, prefered_lft);
825 return __inet_insert_ifa(ifa, nlh, NETLINK_CB(skb).portid);
826 } else {
827 inet_free_ifa(ifa);
828
829 if (nlh->nlmsg_flags & NLM_F_EXCL ||
830 !(nlh->nlmsg_flags & NLM_F_REPLACE))
831 return -EEXIST;
832 ifa = ifa_existing;
833 set_ifa_lifetime(ifa, valid_lft, prefered_lft);
834 cancel_delayed_work(&check_lifetime_work);
835 schedule_delayed_work(&check_lifetime_work, 0);
836 rtmsg_ifa(RTM_NEWADDR, ifa, nlh, NETLINK_CB(skb).portid);
837 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa);
838 }
839 return 0;
840 }
841
842 /*
843 * Determine a default network mask, based on the IP address.
844 */
845
846 static int inet_abc_len(__be32 addr)
847 {
848 int rc = -1; /* Something else, probably a multicast. */
849
850 if (ipv4_is_zeronet(addr))
851 rc = 0;
852 else {
853 __u32 haddr = ntohl(addr);
854
855 if (IN_CLASSA(haddr))
856 rc = 8;
857 else if (IN_CLASSB(haddr))
858 rc = 16;
859 else if (IN_CLASSC(haddr))
860 rc = 24;
861 }
862
863 return rc;
864 }
865
866
867 int devinet_ioctl(struct net *net, unsigned int cmd, void __user *arg)
868 {
869 struct ifreq ifr;
870 struct sockaddr_in sin_orig;
871 struct sockaddr_in *sin = (struct sockaddr_in *)&ifr.ifr_addr;
872 struct in_device *in_dev;
873 struct in_ifaddr **ifap = NULL;
874 struct in_ifaddr *ifa = NULL;
875 struct net_device *dev;
876 char *colon;
877 int ret = -EFAULT;
878 int tryaddrmatch = 0;
879
880 /*
881 * Fetch the caller's info block into kernel space
882 */
883
884 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
885 goto out;
886 ifr.ifr_name[IFNAMSIZ - 1] = 0;
887
888 /* save original address for comparison */
889 memcpy(&sin_orig, sin, sizeof(*sin));
890
891 colon = strchr(ifr.ifr_name, ':');
892 if (colon)
893 *colon = 0;
894
895 dev_load(net, ifr.ifr_name);
896
897 switch (cmd) {
898 case SIOCGIFADDR: /* Get interface address */
899 case SIOCGIFBRDADDR: /* Get the broadcast address */
900 case SIOCGIFDSTADDR: /* Get the destination address */
901 case SIOCGIFNETMASK: /* Get the netmask for the interface */
902 /* Note that these ioctls will not sleep,
903 so that we do not impose a lock.
904 One day we will be forced to put shlock here (I mean SMP)
905 */
906 tryaddrmatch = (sin_orig.sin_family == AF_INET);
907 memset(sin, 0, sizeof(*sin));
908 sin->sin_family = AF_INET;
909 break;
910
911 case SIOCSIFFLAGS:
912 ret = -EPERM;
913 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
914 goto out;
915 break;
916 case SIOCSIFADDR: /* Set interface address (and family) */
917 case SIOCSIFBRDADDR: /* Set the broadcast address */
918 case SIOCSIFDSTADDR: /* Set the destination address */
919 case SIOCSIFNETMASK: /* Set the netmask for the interface */
920 ret = -EPERM;
921 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
922 goto out;
923 ret = -EINVAL;
924 if (sin->sin_family != AF_INET)
925 goto out;
926 break;
927 default:
928 ret = -EINVAL;
929 goto out;
930 }
931
932 rtnl_lock();
933
934 ret = -ENODEV;
935 dev = __dev_get_by_name(net, ifr.ifr_name);
936 if (!dev)
937 goto done;
938
939 if (colon)
940 *colon = ':';
941
942 in_dev = __in_dev_get_rtnl(dev);
943 if (in_dev) {
944 if (tryaddrmatch) {
945 /* Matthias Andree */
946 /* compare label and address (4.4BSD style) */
947 /* note: we only do this for a limited set of ioctls
948 and only if the original address family was AF_INET.
949 This is checked above. */
950 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
951 ifap = &ifa->ifa_next) {
952 if (!strcmp(ifr.ifr_name, ifa->ifa_label) &&
953 sin_orig.sin_addr.s_addr ==
954 ifa->ifa_local) {
955 break; /* found */
956 }
957 }
958 }
959 /* we didn't get a match, maybe the application is
960 4.3BSD-style and passed in junk so we fall back to
961 comparing just the label */
962 if (!ifa) {
963 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
964 ifap = &ifa->ifa_next)
965 if (!strcmp(ifr.ifr_name, ifa->ifa_label))
966 break;
967 }
968 }
969
970 ret = -EADDRNOTAVAIL;
971 if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS)
972 goto done;
973
974 switch (cmd) {
975 case SIOCGIFADDR: /* Get interface address */
976 sin->sin_addr.s_addr = ifa->ifa_local;
977 goto rarok;
978
979 case SIOCGIFBRDADDR: /* Get the broadcast address */
980 sin->sin_addr.s_addr = ifa->ifa_broadcast;
981 goto rarok;
982
983 case SIOCGIFDSTADDR: /* Get the destination address */
984 sin->sin_addr.s_addr = ifa->ifa_address;
985 goto rarok;
986
987 case SIOCGIFNETMASK: /* Get the netmask for the interface */
988 sin->sin_addr.s_addr = ifa->ifa_mask;
989 goto rarok;
990
991 case SIOCSIFFLAGS:
992 if (colon) {
993 ret = -EADDRNOTAVAIL;
994 if (!ifa)
995 break;
996 ret = 0;
997 if (!(ifr.ifr_flags & IFF_UP))
998 inet_del_ifa(in_dev, ifap, 1);
999 break;
1000 }
1001 ret = dev_change_flags(dev, ifr.ifr_flags);
1002 break;
1003
1004 case SIOCSIFADDR: /* Set interface address (and family) */
1005 ret = -EINVAL;
1006 if (inet_abc_len(sin->sin_addr.s_addr) < 0)
1007 break;
1008
1009 if (!ifa) {
1010 ret = -ENOBUFS;
1011 ifa = inet_alloc_ifa();
1012 if (!ifa)
1013 break;
1014 INIT_HLIST_NODE(&ifa->hash);
1015 if (colon)
1016 memcpy(ifa->ifa_label, ifr.ifr_name, IFNAMSIZ);
1017 else
1018 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1019 } else {
1020 ret = 0;
1021 if (ifa->ifa_local == sin->sin_addr.s_addr)
1022 break;
1023 inet_del_ifa(in_dev, ifap, 0);
1024 ifa->ifa_broadcast = 0;
1025 ifa->ifa_scope = 0;
1026 }
1027
1028 ifa->ifa_address = ifa->ifa_local = sin->sin_addr.s_addr;
1029
1030 if (!(dev->flags & IFF_POINTOPOINT)) {
1031 ifa->ifa_prefixlen = inet_abc_len(ifa->ifa_address);
1032 ifa->ifa_mask = inet_make_mask(ifa->ifa_prefixlen);
1033 if ((dev->flags & IFF_BROADCAST) &&
1034 ifa->ifa_prefixlen < 31)
1035 ifa->ifa_broadcast = ifa->ifa_address |
1036 ~ifa->ifa_mask;
1037 } else {
1038 ifa->ifa_prefixlen = 32;
1039 ifa->ifa_mask = inet_make_mask(32);
1040 }
1041 set_ifa_lifetime(ifa, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1042 ret = inet_set_ifa(dev, ifa);
1043 break;
1044
1045 case SIOCSIFBRDADDR: /* Set the broadcast address */
1046 ret = 0;
1047 if (ifa->ifa_broadcast != sin->sin_addr.s_addr) {
1048 inet_del_ifa(in_dev, ifap, 0);
1049 ifa->ifa_broadcast = sin->sin_addr.s_addr;
1050 inet_insert_ifa(ifa);
1051 }
1052 break;
1053
1054 case SIOCSIFDSTADDR: /* Set the destination address */
1055 ret = 0;
1056 if (ifa->ifa_address == sin->sin_addr.s_addr)
1057 break;
1058 ret = -EINVAL;
1059 if (inet_abc_len(sin->sin_addr.s_addr) < 0)
1060 break;
1061 ret = 0;
1062 inet_del_ifa(in_dev, ifap, 0);
1063 ifa->ifa_address = sin->sin_addr.s_addr;
1064 inet_insert_ifa(ifa);
1065 break;
1066
1067 case SIOCSIFNETMASK: /* Set the netmask for the interface */
1068
1069 /*
1070 * The mask we set must be legal.
1071 */
1072 ret = -EINVAL;
1073 if (bad_mask(sin->sin_addr.s_addr, 0))
1074 break;
1075 ret = 0;
1076 if (ifa->ifa_mask != sin->sin_addr.s_addr) {
1077 __be32 old_mask = ifa->ifa_mask;
1078 inet_del_ifa(in_dev, ifap, 0);
1079 ifa->ifa_mask = sin->sin_addr.s_addr;
1080 ifa->ifa_prefixlen = inet_mask_len(ifa->ifa_mask);
1081
1082 /* See if current broadcast address matches
1083 * with current netmask, then recalculate
1084 * the broadcast address. Otherwise it's a
1085 * funny address, so don't touch it since
1086 * the user seems to know what (s)he's doing...
1087 */
1088 if ((dev->flags & IFF_BROADCAST) &&
1089 (ifa->ifa_prefixlen < 31) &&
1090 (ifa->ifa_broadcast ==
1091 (ifa->ifa_local|~old_mask))) {
1092 ifa->ifa_broadcast = (ifa->ifa_local |
1093 ~sin->sin_addr.s_addr);
1094 }
1095 inet_insert_ifa(ifa);
1096 }
1097 break;
1098 }
1099 done:
1100 rtnl_unlock();
1101 out:
1102 return ret;
1103 rarok:
1104 rtnl_unlock();
1105 ret = copy_to_user(arg, &ifr, sizeof(struct ifreq)) ? -EFAULT : 0;
1106 goto out;
1107 }
1108
1109 static int inet_gifconf(struct net_device *dev, char __user *buf, int len)
1110 {
1111 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1112 struct in_ifaddr *ifa;
1113 struct ifreq ifr;
1114 int done = 0;
1115
1116 if (!in_dev)
1117 goto out;
1118
1119 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1120 if (!buf) {
1121 done += sizeof(ifr);
1122 continue;
1123 }
1124 if (len < (int) sizeof(ifr))
1125 break;
1126 memset(&ifr, 0, sizeof(struct ifreq));
1127 if (ifa->ifa_label)
1128 strcpy(ifr.ifr_name, ifa->ifa_label);
1129 else
1130 strcpy(ifr.ifr_name, dev->name);
1131
1132 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_family = AF_INET;
1133 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_addr.s_addr =
1134 ifa->ifa_local;
1135
1136 if (copy_to_user(buf, &ifr, sizeof(struct ifreq))) {
1137 done = -EFAULT;
1138 break;
1139 }
1140 buf += sizeof(struct ifreq);
1141 len -= sizeof(struct ifreq);
1142 done += sizeof(struct ifreq);
1143 }
1144 out:
1145 return done;
1146 }
1147
1148 __be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope)
1149 {
1150 __be32 addr = 0;
1151 struct in_device *in_dev;
1152 struct net *net = dev_net(dev);
1153
1154 rcu_read_lock();
1155 in_dev = __in_dev_get_rcu(dev);
1156 if (!in_dev)
1157 goto no_in_dev;
1158
1159 for_primary_ifa(in_dev) {
1160 if (ifa->ifa_scope > scope)
1161 continue;
1162 if (!dst || inet_ifa_match(dst, ifa)) {
1163 addr = ifa->ifa_local;
1164 break;
1165 }
1166 if (!addr)
1167 addr = ifa->ifa_local;
1168 } endfor_ifa(in_dev);
1169
1170 if (addr)
1171 goto out_unlock;
1172 no_in_dev:
1173
1174 /* Not loopback addresses on loopback should be preferred
1175 in this case. It is importnat that lo is the first interface
1176 in dev_base list.
1177 */
1178 for_each_netdev_rcu(net, dev) {
1179 in_dev = __in_dev_get_rcu(dev);
1180 if (!in_dev)
1181 continue;
1182
1183 for_primary_ifa(in_dev) {
1184 if (ifa->ifa_scope != RT_SCOPE_LINK &&
1185 ifa->ifa_scope <= scope) {
1186 addr = ifa->ifa_local;
1187 goto out_unlock;
1188 }
1189 } endfor_ifa(in_dev);
1190 }
1191 out_unlock:
1192 rcu_read_unlock();
1193 return addr;
1194 }
1195 EXPORT_SYMBOL(inet_select_addr);
1196
1197 static __be32 confirm_addr_indev(struct in_device *in_dev, __be32 dst,
1198 __be32 local, int scope)
1199 {
1200 int same = 0;
1201 __be32 addr = 0;
1202
1203 for_ifa(in_dev) {
1204 if (!addr &&
1205 (local == ifa->ifa_local || !local) &&
1206 ifa->ifa_scope <= scope) {
1207 addr = ifa->ifa_local;
1208 if (same)
1209 break;
1210 }
1211 if (!same) {
1212 same = (!local || inet_ifa_match(local, ifa)) &&
1213 (!dst || inet_ifa_match(dst, ifa));
1214 if (same && addr) {
1215 if (local || !dst)
1216 break;
1217 /* Is the selected addr into dst subnet? */
1218 if (inet_ifa_match(addr, ifa))
1219 break;
1220 /* No, then can we use new local src? */
1221 if (ifa->ifa_scope <= scope) {
1222 addr = ifa->ifa_local;
1223 break;
1224 }
1225 /* search for large dst subnet for addr */
1226 same = 0;
1227 }
1228 }
1229 } endfor_ifa(in_dev);
1230
1231 return same ? addr : 0;
1232 }
1233
1234 /*
1235 * Confirm that local IP address exists using wildcards:
1236 * - in_dev: only on this interface, 0=any interface
1237 * - dst: only in the same subnet as dst, 0=any dst
1238 * - local: address, 0=autoselect the local address
1239 * - scope: maximum allowed scope value for the local address
1240 */
1241 __be32 inet_confirm_addr(struct in_device *in_dev,
1242 __be32 dst, __be32 local, int scope)
1243 {
1244 __be32 addr = 0;
1245 struct net_device *dev;
1246 struct net *net;
1247
1248 if (scope != RT_SCOPE_LINK)
1249 return confirm_addr_indev(in_dev, dst, local, scope);
1250
1251 net = dev_net(in_dev->dev);
1252 rcu_read_lock();
1253 for_each_netdev_rcu(net, dev) {
1254 in_dev = __in_dev_get_rcu(dev);
1255 if (in_dev) {
1256 addr = confirm_addr_indev(in_dev, dst, local, scope);
1257 if (addr)
1258 break;
1259 }
1260 }
1261 rcu_read_unlock();
1262
1263 return addr;
1264 }
1265 EXPORT_SYMBOL(inet_confirm_addr);
1266
1267 /*
1268 * Device notifier
1269 */
1270
1271 int register_inetaddr_notifier(struct notifier_block *nb)
1272 {
1273 return blocking_notifier_chain_register(&inetaddr_chain, nb);
1274 }
1275 EXPORT_SYMBOL(register_inetaddr_notifier);
1276
1277 int unregister_inetaddr_notifier(struct notifier_block *nb)
1278 {
1279 return blocking_notifier_chain_unregister(&inetaddr_chain, nb);
1280 }
1281 EXPORT_SYMBOL(unregister_inetaddr_notifier);
1282
1283 /* Rename ifa_labels for a device name change. Make some effort to preserve
1284 * existing alias numbering and to create unique labels if possible.
1285 */
1286 static void inetdev_changename(struct net_device *dev, struct in_device *in_dev)
1287 {
1288 struct in_ifaddr *ifa;
1289 int named = 0;
1290
1291 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1292 char old[IFNAMSIZ], *dot;
1293
1294 memcpy(old, ifa->ifa_label, IFNAMSIZ);
1295 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1296 if (named++ == 0)
1297 goto skip;
1298 dot = strchr(old, ':');
1299 if (dot == NULL) {
1300 sprintf(old, ":%d", named);
1301 dot = old;
1302 }
1303 if (strlen(dot) + strlen(dev->name) < IFNAMSIZ)
1304 strcat(ifa->ifa_label, dot);
1305 else
1306 strcpy(ifa->ifa_label + (IFNAMSIZ - strlen(dot) - 1), dot);
1307 skip:
1308 rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0);
1309 }
1310 }
1311
1312 static bool inetdev_valid_mtu(unsigned int mtu)
1313 {
1314 return mtu >= 68;
1315 }
1316
1317 static void inetdev_send_gratuitous_arp(struct net_device *dev,
1318 struct in_device *in_dev)
1319
1320 {
1321 struct in_ifaddr *ifa;
1322
1323 for (ifa = in_dev->ifa_list; ifa;
1324 ifa = ifa->ifa_next) {
1325 arp_send(ARPOP_REQUEST, ETH_P_ARP,
1326 ifa->ifa_local, dev,
1327 ifa->ifa_local, NULL,
1328 dev->dev_addr, NULL);
1329 }
1330 }
1331
1332 /* Called only under RTNL semaphore */
1333
1334 static int inetdev_event(struct notifier_block *this, unsigned long event,
1335 void *ptr)
1336 {
1337 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1338 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1339
1340 ASSERT_RTNL();
1341
1342 if (!in_dev) {
1343 if (event == NETDEV_REGISTER) {
1344 in_dev = inetdev_init(dev);
1345 if (!in_dev)
1346 return notifier_from_errno(-ENOMEM);
1347 if (dev->flags & IFF_LOOPBACK) {
1348 IN_DEV_CONF_SET(in_dev, NOXFRM, 1);
1349 IN_DEV_CONF_SET(in_dev, NOPOLICY, 1);
1350 }
1351 } else if (event == NETDEV_CHANGEMTU) {
1352 /* Re-enabling IP */
1353 if (inetdev_valid_mtu(dev->mtu))
1354 in_dev = inetdev_init(dev);
1355 }
1356 goto out;
1357 }
1358
1359 switch (event) {
1360 case NETDEV_REGISTER:
1361 pr_debug("%s: bug\n", __func__);
1362 RCU_INIT_POINTER(dev->ip_ptr, NULL);
1363 break;
1364 case NETDEV_UP:
1365 if (!inetdev_valid_mtu(dev->mtu))
1366 break;
1367 if (dev->flags & IFF_LOOPBACK) {
1368 struct in_ifaddr *ifa = inet_alloc_ifa();
1369
1370 if (ifa) {
1371 INIT_HLIST_NODE(&ifa->hash);
1372 ifa->ifa_local =
1373 ifa->ifa_address = htonl(INADDR_LOOPBACK);
1374 ifa->ifa_prefixlen = 8;
1375 ifa->ifa_mask = inet_make_mask(8);
1376 in_dev_hold(in_dev);
1377 ifa->ifa_dev = in_dev;
1378 ifa->ifa_scope = RT_SCOPE_HOST;
1379 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1380 set_ifa_lifetime(ifa, INFINITY_LIFE_TIME,
1381 INFINITY_LIFE_TIME);
1382 inet_insert_ifa(ifa);
1383 }
1384 }
1385 ip_mc_up(in_dev);
1386 /* fall through */
1387 case NETDEV_CHANGEADDR:
1388 if (!IN_DEV_ARP_NOTIFY(in_dev))
1389 break;
1390 /* fall through */
1391 case NETDEV_NOTIFY_PEERS:
1392 /* Send gratuitous ARP to notify of link change */
1393 inetdev_send_gratuitous_arp(dev, in_dev);
1394 break;
1395 case NETDEV_DOWN:
1396 ip_mc_down(in_dev);
1397 break;
1398 case NETDEV_PRE_TYPE_CHANGE:
1399 ip_mc_unmap(in_dev);
1400 break;
1401 case NETDEV_POST_TYPE_CHANGE:
1402 ip_mc_remap(in_dev);
1403 break;
1404 case NETDEV_CHANGEMTU:
1405 if (inetdev_valid_mtu(dev->mtu))
1406 break;
1407 /* disable IP when MTU is not enough */
1408 case NETDEV_UNREGISTER:
1409 inetdev_destroy(in_dev);
1410 break;
1411 case NETDEV_CHANGENAME:
1412 /* Do not notify about label change, this event is
1413 * not interesting to applications using netlink.
1414 */
1415 inetdev_changename(dev, in_dev);
1416
1417 devinet_sysctl_unregister(in_dev);
1418 devinet_sysctl_register(in_dev);
1419 break;
1420 }
1421 out:
1422 return NOTIFY_DONE;
1423 }
1424
1425 static struct notifier_block ip_netdev_notifier = {
1426 .notifier_call = inetdev_event,
1427 };
1428
1429 static size_t inet_nlmsg_size(void)
1430 {
1431 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
1432 + nla_total_size(4) /* IFA_ADDRESS */
1433 + nla_total_size(4) /* IFA_LOCAL */
1434 + nla_total_size(4) /* IFA_BROADCAST */
1435 + nla_total_size(IFNAMSIZ); /* IFA_LABEL */
1436 }
1437
1438 static inline u32 cstamp_delta(unsigned long cstamp)
1439 {
1440 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
1441 }
1442
1443 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
1444 unsigned long tstamp, u32 preferred, u32 valid)
1445 {
1446 struct ifa_cacheinfo ci;
1447
1448 ci.cstamp = cstamp_delta(cstamp);
1449 ci.tstamp = cstamp_delta(tstamp);
1450 ci.ifa_prefered = preferred;
1451 ci.ifa_valid = valid;
1452
1453 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
1454 }
1455
1456 static int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa,
1457 u32 portid, u32 seq, int event, unsigned int flags)
1458 {
1459 struct ifaddrmsg *ifm;
1460 struct nlmsghdr *nlh;
1461 u32 preferred, valid;
1462
1463 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*ifm), flags);
1464 if (nlh == NULL)
1465 return -EMSGSIZE;
1466
1467 ifm = nlmsg_data(nlh);
1468 ifm->ifa_family = AF_INET;
1469 ifm->ifa_prefixlen = ifa->ifa_prefixlen;
1470 ifm->ifa_flags = ifa->ifa_flags;
1471 ifm->ifa_scope = ifa->ifa_scope;
1472 ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
1473
1474 if (!(ifm->ifa_flags & IFA_F_PERMANENT)) {
1475 preferred = ifa->ifa_preferred_lft;
1476 valid = ifa->ifa_valid_lft;
1477 if (preferred != INFINITY_LIFE_TIME) {
1478 long tval = (jiffies - ifa->ifa_tstamp) / HZ;
1479
1480 if (preferred > tval)
1481 preferred -= tval;
1482 else
1483 preferred = 0;
1484 if (valid != INFINITY_LIFE_TIME) {
1485 if (valid > tval)
1486 valid -= tval;
1487 else
1488 valid = 0;
1489 }
1490 }
1491 } else {
1492 preferred = INFINITY_LIFE_TIME;
1493 valid = INFINITY_LIFE_TIME;
1494 }
1495 if ((ifa->ifa_address &&
1496 nla_put_be32(skb, IFA_ADDRESS, ifa->ifa_address)) ||
1497 (ifa->ifa_local &&
1498 nla_put_be32(skb, IFA_LOCAL, ifa->ifa_local)) ||
1499 (ifa->ifa_broadcast &&
1500 nla_put_be32(skb, IFA_BROADCAST, ifa->ifa_broadcast)) ||
1501 (ifa->ifa_label[0] &&
1502 nla_put_string(skb, IFA_LABEL, ifa->ifa_label)) ||
1503 put_cacheinfo(skb, ifa->ifa_cstamp, ifa->ifa_tstamp,
1504 preferred, valid))
1505 goto nla_put_failure;
1506
1507 return nlmsg_end(skb, nlh);
1508
1509 nla_put_failure:
1510 nlmsg_cancel(skb, nlh);
1511 return -EMSGSIZE;
1512 }
1513
1514 static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
1515 {
1516 struct net *net = sock_net(skb->sk);
1517 int h, s_h;
1518 int idx, s_idx;
1519 int ip_idx, s_ip_idx;
1520 struct net_device *dev;
1521 struct in_device *in_dev;
1522 struct in_ifaddr *ifa;
1523 struct hlist_head *head;
1524
1525 s_h = cb->args[0];
1526 s_idx = idx = cb->args[1];
1527 s_ip_idx = ip_idx = cb->args[2];
1528
1529 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1530 idx = 0;
1531 head = &net->dev_index_head[h];
1532 rcu_read_lock();
1533 cb->seq = atomic_read(&net->ipv4.dev_addr_genid) ^
1534 net->dev_base_seq;
1535 hlist_for_each_entry_rcu(dev, head, index_hlist) {
1536 if (idx < s_idx)
1537 goto cont;
1538 if (h > s_h || idx > s_idx)
1539 s_ip_idx = 0;
1540 in_dev = __in_dev_get_rcu(dev);
1541 if (!in_dev)
1542 goto cont;
1543
1544 for (ifa = in_dev->ifa_list, ip_idx = 0; ifa;
1545 ifa = ifa->ifa_next, ip_idx++) {
1546 if (ip_idx < s_ip_idx)
1547 continue;
1548 if (inet_fill_ifaddr(skb, ifa,
1549 NETLINK_CB(cb->skb).portid,
1550 cb->nlh->nlmsg_seq,
1551 RTM_NEWADDR, NLM_F_MULTI) <= 0) {
1552 rcu_read_unlock();
1553 goto done;
1554 }
1555 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1556 }
1557 cont:
1558 idx++;
1559 }
1560 rcu_read_unlock();
1561 }
1562
1563 done:
1564 cb->args[0] = h;
1565 cb->args[1] = idx;
1566 cb->args[2] = ip_idx;
1567
1568 return skb->len;
1569 }
1570
1571 static void rtmsg_ifa(int event, struct in_ifaddr *ifa, struct nlmsghdr *nlh,
1572 u32 portid)
1573 {
1574 struct sk_buff *skb;
1575 u32 seq = nlh ? nlh->nlmsg_seq : 0;
1576 int err = -ENOBUFS;
1577 struct net *net;
1578
1579 net = dev_net(ifa->ifa_dev->dev);
1580 skb = nlmsg_new(inet_nlmsg_size(), GFP_KERNEL);
1581 if (skb == NULL)
1582 goto errout;
1583
1584 err = inet_fill_ifaddr(skb, ifa, portid, seq, event, 0);
1585 if (err < 0) {
1586 /* -EMSGSIZE implies BUG in inet_nlmsg_size() */
1587 WARN_ON(err == -EMSGSIZE);
1588 kfree_skb(skb);
1589 goto errout;
1590 }
1591 rtnl_notify(skb, net, portid, RTNLGRP_IPV4_IFADDR, nlh, GFP_KERNEL);
1592 return;
1593 errout:
1594 if (err < 0)
1595 rtnl_set_sk_err(net, RTNLGRP_IPV4_IFADDR, err);
1596 }
1597
1598 static size_t inet_get_link_af_size(const struct net_device *dev)
1599 {
1600 struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr);
1601
1602 if (!in_dev)
1603 return 0;
1604
1605 return nla_total_size(IPV4_DEVCONF_MAX * 4); /* IFLA_INET_CONF */
1606 }
1607
1608 static int inet_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
1609 {
1610 struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr);
1611 struct nlattr *nla;
1612 int i;
1613
1614 if (!in_dev)
1615 return -ENODATA;
1616
1617 nla = nla_reserve(skb, IFLA_INET_CONF, IPV4_DEVCONF_MAX * 4);
1618 if (nla == NULL)
1619 return -EMSGSIZE;
1620
1621 for (i = 0; i < IPV4_DEVCONF_MAX; i++)
1622 ((u32 *) nla_data(nla))[i] = in_dev->cnf.data[i];
1623
1624 return 0;
1625 }
1626
1627 static const struct nla_policy inet_af_policy[IFLA_INET_MAX+1] = {
1628 [IFLA_INET_CONF] = { .type = NLA_NESTED },
1629 };
1630
1631 static int inet_validate_link_af(const struct net_device *dev,
1632 const struct nlattr *nla)
1633 {
1634 struct nlattr *a, *tb[IFLA_INET_MAX+1];
1635 int err, rem;
1636
1637 if (dev && !__in_dev_get_rtnl(dev))
1638 return -EAFNOSUPPORT;
1639
1640 err = nla_parse_nested(tb, IFLA_INET_MAX, nla, inet_af_policy);
1641 if (err < 0)
1642 return err;
1643
1644 if (tb[IFLA_INET_CONF]) {
1645 nla_for_each_nested(a, tb[IFLA_INET_CONF], rem) {
1646 int cfgid = nla_type(a);
1647
1648 if (nla_len(a) < 4)
1649 return -EINVAL;
1650
1651 if (cfgid <= 0 || cfgid > IPV4_DEVCONF_MAX)
1652 return -EINVAL;
1653 }
1654 }
1655
1656 return 0;
1657 }
1658
1659 static int inet_set_link_af(struct net_device *dev, const struct nlattr *nla)
1660 {
1661 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1662 struct nlattr *a, *tb[IFLA_INET_MAX+1];
1663 int rem;
1664
1665 if (!in_dev)
1666 return -EAFNOSUPPORT;
1667
1668 if (nla_parse_nested(tb, IFLA_INET_MAX, nla, NULL) < 0)
1669 BUG();
1670
1671 if (tb[IFLA_INET_CONF]) {
1672 nla_for_each_nested(a, tb[IFLA_INET_CONF], rem)
1673 ipv4_devconf_set(in_dev, nla_type(a), nla_get_u32(a));
1674 }
1675
1676 return 0;
1677 }
1678
1679 static int inet_netconf_msgsize_devconf(int type)
1680 {
1681 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
1682 + nla_total_size(4); /* NETCONFA_IFINDEX */
1683
1684 /* type -1 is used for ALL */
1685 if (type == -1 || type == NETCONFA_FORWARDING)
1686 size += nla_total_size(4);
1687 if (type == -1 || type == NETCONFA_RP_FILTER)
1688 size += nla_total_size(4);
1689 if (type == -1 || type == NETCONFA_MC_FORWARDING)
1690 size += nla_total_size(4);
1691
1692 return size;
1693 }
1694
1695 static int inet_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
1696 struct ipv4_devconf *devconf, u32 portid,
1697 u32 seq, int event, unsigned int flags,
1698 int type)
1699 {
1700 struct nlmsghdr *nlh;
1701 struct netconfmsg *ncm;
1702
1703 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
1704 flags);
1705 if (nlh == NULL)
1706 return -EMSGSIZE;
1707
1708 ncm = nlmsg_data(nlh);
1709 ncm->ncm_family = AF_INET;
1710
1711 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
1712 goto nla_put_failure;
1713
1714 /* type -1 is used for ALL */
1715 if ((type == -1 || type == NETCONFA_FORWARDING) &&
1716 nla_put_s32(skb, NETCONFA_FORWARDING,
1717 IPV4_DEVCONF(*devconf, FORWARDING)) < 0)
1718 goto nla_put_failure;
1719 if ((type == -1 || type == NETCONFA_RP_FILTER) &&
1720 nla_put_s32(skb, NETCONFA_RP_FILTER,
1721 IPV4_DEVCONF(*devconf, RP_FILTER)) < 0)
1722 goto nla_put_failure;
1723 if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
1724 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
1725 IPV4_DEVCONF(*devconf, MC_FORWARDING)) < 0)
1726 goto nla_put_failure;
1727
1728 return nlmsg_end(skb, nlh);
1729
1730 nla_put_failure:
1731 nlmsg_cancel(skb, nlh);
1732 return -EMSGSIZE;
1733 }
1734
1735 void inet_netconf_notify_devconf(struct net *net, int type, int ifindex,
1736 struct ipv4_devconf *devconf)
1737 {
1738 struct sk_buff *skb;
1739 int err = -ENOBUFS;
1740
1741 skb = nlmsg_new(inet_netconf_msgsize_devconf(type), GFP_ATOMIC);
1742 if (skb == NULL)
1743 goto errout;
1744
1745 err = inet_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
1746 RTM_NEWNETCONF, 0, type);
1747 if (err < 0) {
1748 /* -EMSGSIZE implies BUG in inet_netconf_msgsize_devconf() */
1749 WARN_ON(err == -EMSGSIZE);
1750 kfree_skb(skb);
1751 goto errout;
1752 }
1753 rtnl_notify(skb, net, 0, RTNLGRP_IPV4_NETCONF, NULL, GFP_ATOMIC);
1754 return;
1755 errout:
1756 if (err < 0)
1757 rtnl_set_sk_err(net, RTNLGRP_IPV4_NETCONF, err);
1758 }
1759
1760 static const struct nla_policy devconf_ipv4_policy[NETCONFA_MAX+1] = {
1761 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
1762 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
1763 [NETCONFA_RP_FILTER] = { .len = sizeof(int) },
1764 };
1765
1766 static int inet_netconf_get_devconf(struct sk_buff *in_skb,
1767 struct nlmsghdr *nlh)
1768 {
1769 struct net *net = sock_net(in_skb->sk);
1770 struct nlattr *tb[NETCONFA_MAX+1];
1771 struct netconfmsg *ncm;
1772 struct sk_buff *skb;
1773 struct ipv4_devconf *devconf;
1774 struct in_device *in_dev;
1775 struct net_device *dev;
1776 int ifindex;
1777 int err;
1778
1779 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
1780 devconf_ipv4_policy);
1781 if (err < 0)
1782 goto errout;
1783
1784 err = EINVAL;
1785 if (!tb[NETCONFA_IFINDEX])
1786 goto errout;
1787
1788 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
1789 switch (ifindex) {
1790 case NETCONFA_IFINDEX_ALL:
1791 devconf = net->ipv4.devconf_all;
1792 break;
1793 case NETCONFA_IFINDEX_DEFAULT:
1794 devconf = net->ipv4.devconf_dflt;
1795 break;
1796 default:
1797 dev = __dev_get_by_index(net, ifindex);
1798 if (dev == NULL)
1799 goto errout;
1800 in_dev = __in_dev_get_rtnl(dev);
1801 if (in_dev == NULL)
1802 goto errout;
1803 devconf = &in_dev->cnf;
1804 break;
1805 }
1806
1807 err = -ENOBUFS;
1808 skb = nlmsg_new(inet_netconf_msgsize_devconf(-1), GFP_ATOMIC);
1809 if (skb == NULL)
1810 goto errout;
1811
1812 err = inet_netconf_fill_devconf(skb, ifindex, devconf,
1813 NETLINK_CB(in_skb).portid,
1814 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
1815 -1);
1816 if (err < 0) {
1817 /* -EMSGSIZE implies BUG in inet_netconf_msgsize_devconf() */
1818 WARN_ON(err == -EMSGSIZE);
1819 kfree_skb(skb);
1820 goto errout;
1821 }
1822 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
1823 errout:
1824 return err;
1825 }
1826
1827 static int inet_netconf_dump_devconf(struct sk_buff *skb,
1828 struct netlink_callback *cb)
1829 {
1830 struct net *net = sock_net(skb->sk);
1831 int h, s_h;
1832 int idx, s_idx;
1833 struct net_device *dev;
1834 struct in_device *in_dev;
1835 struct hlist_head *head;
1836
1837 s_h = cb->args[0];
1838 s_idx = idx = cb->args[1];
1839
1840 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1841 idx = 0;
1842 head = &net->dev_index_head[h];
1843 rcu_read_lock();
1844 cb->seq = atomic_read(&net->ipv4.dev_addr_genid) ^
1845 net->dev_base_seq;
1846 hlist_for_each_entry_rcu(dev, head, index_hlist) {
1847 if (idx < s_idx)
1848 goto cont;
1849 in_dev = __in_dev_get_rcu(dev);
1850 if (!in_dev)
1851 goto cont;
1852
1853 if (inet_netconf_fill_devconf(skb, dev->ifindex,
1854 &in_dev->cnf,
1855 NETLINK_CB(cb->skb).portid,
1856 cb->nlh->nlmsg_seq,
1857 RTM_NEWNETCONF,
1858 NLM_F_MULTI,
1859 -1) <= 0) {
1860 rcu_read_unlock();
1861 goto done;
1862 }
1863 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1864 cont:
1865 idx++;
1866 }
1867 rcu_read_unlock();
1868 }
1869 if (h == NETDEV_HASHENTRIES) {
1870 if (inet_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
1871 net->ipv4.devconf_all,
1872 NETLINK_CB(cb->skb).portid,
1873 cb->nlh->nlmsg_seq,
1874 RTM_NEWNETCONF, NLM_F_MULTI,
1875 -1) <= 0)
1876 goto done;
1877 else
1878 h++;
1879 }
1880 if (h == NETDEV_HASHENTRIES + 1) {
1881 if (inet_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
1882 net->ipv4.devconf_dflt,
1883 NETLINK_CB(cb->skb).portid,
1884 cb->nlh->nlmsg_seq,
1885 RTM_NEWNETCONF, NLM_F_MULTI,
1886 -1) <= 0)
1887 goto done;
1888 else
1889 h++;
1890 }
1891 done:
1892 cb->args[0] = h;
1893 cb->args[1] = idx;
1894
1895 return skb->len;
1896 }
1897
1898 #ifdef CONFIG_SYSCTL
1899
1900 static void devinet_copy_dflt_conf(struct net *net, int i)
1901 {
1902 struct net_device *dev;
1903
1904 rcu_read_lock();
1905 for_each_netdev_rcu(net, dev) {
1906 struct in_device *in_dev;
1907
1908 in_dev = __in_dev_get_rcu(dev);
1909 if (in_dev && !test_bit(i, in_dev->cnf.state))
1910 in_dev->cnf.data[i] = net->ipv4.devconf_dflt->data[i];
1911 }
1912 rcu_read_unlock();
1913 }
1914
1915 /* called with RTNL locked */
1916 static void inet_forward_change(struct net *net)
1917 {
1918 struct net_device *dev;
1919 int on = IPV4_DEVCONF_ALL(net, FORWARDING);
1920
1921 IPV4_DEVCONF_ALL(net, ACCEPT_REDIRECTS) = !on;
1922 IPV4_DEVCONF_DFLT(net, FORWARDING) = on;
1923 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING,
1924 NETCONFA_IFINDEX_ALL,
1925 net->ipv4.devconf_all);
1926 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING,
1927 NETCONFA_IFINDEX_DEFAULT,
1928 net->ipv4.devconf_dflt);
1929
1930 for_each_netdev(net, dev) {
1931 struct in_device *in_dev;
1932 if (on)
1933 dev_disable_lro(dev);
1934 rcu_read_lock();
1935 in_dev = __in_dev_get_rcu(dev);
1936 if (in_dev) {
1937 IN_DEV_CONF_SET(in_dev, FORWARDING, on);
1938 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING,
1939 dev->ifindex, &in_dev->cnf);
1940 }
1941 rcu_read_unlock();
1942 }
1943 }
1944
1945 static int devinet_conf_proc(struct ctl_table *ctl, int write,
1946 void __user *buffer,
1947 size_t *lenp, loff_t *ppos)
1948 {
1949 int old_value = *(int *)ctl->data;
1950 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
1951 int new_value = *(int *)ctl->data;
1952
1953 if (write) {
1954 struct ipv4_devconf *cnf = ctl->extra1;
1955 struct net *net = ctl->extra2;
1956 int i = (int *)ctl->data - cnf->data;
1957
1958 set_bit(i, cnf->state);
1959
1960 if (cnf == net->ipv4.devconf_dflt)
1961 devinet_copy_dflt_conf(net, i);
1962 if (i == IPV4_DEVCONF_ACCEPT_LOCAL - 1 ||
1963 i == IPV4_DEVCONF_ROUTE_LOCALNET - 1)
1964 if ((new_value == 0) && (old_value != 0))
1965 rt_cache_flush(net);
1966 if (i == IPV4_DEVCONF_RP_FILTER - 1 &&
1967 new_value != old_value) {
1968 int ifindex;
1969
1970 if (cnf == net->ipv4.devconf_dflt)
1971 ifindex = NETCONFA_IFINDEX_DEFAULT;
1972 else if (cnf == net->ipv4.devconf_all)
1973 ifindex = NETCONFA_IFINDEX_ALL;
1974 else {
1975 struct in_device *idev =
1976 container_of(cnf, struct in_device,
1977 cnf);
1978 ifindex = idev->dev->ifindex;
1979 }
1980 inet_netconf_notify_devconf(net, NETCONFA_RP_FILTER,
1981 ifindex, cnf);
1982 }
1983 }
1984
1985 return ret;
1986 }
1987
1988 static int devinet_sysctl_forward(struct ctl_table *ctl, int write,
1989 void __user *buffer,
1990 size_t *lenp, loff_t *ppos)
1991 {
1992 int *valp = ctl->data;
1993 int val = *valp;
1994 loff_t pos = *ppos;
1995 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
1996
1997 if (write && *valp != val) {
1998 struct net *net = ctl->extra2;
1999
2000 if (valp != &IPV4_DEVCONF_DFLT(net, FORWARDING)) {
2001 if (!rtnl_trylock()) {
2002 /* Restore the original values before restarting */
2003 *valp = val;
2004 *ppos = pos;
2005 return restart_syscall();
2006 }
2007 if (valp == &IPV4_DEVCONF_ALL(net, FORWARDING)) {
2008 inet_forward_change(net);
2009 } else {
2010 struct ipv4_devconf *cnf = ctl->extra1;
2011 struct in_device *idev =
2012 container_of(cnf, struct in_device, cnf);
2013 if (*valp)
2014 dev_disable_lro(idev->dev);
2015 inet_netconf_notify_devconf(net,
2016 NETCONFA_FORWARDING,
2017 idev->dev->ifindex,
2018 cnf);
2019 }
2020 rtnl_unlock();
2021 rt_cache_flush(net);
2022 } else
2023 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING,
2024 NETCONFA_IFINDEX_DEFAULT,
2025 net->ipv4.devconf_dflt);
2026 }
2027
2028 return ret;
2029 }
2030
2031 static int ipv4_doint_and_flush(struct ctl_table *ctl, int write,
2032 void __user *buffer,
2033 size_t *lenp, loff_t *ppos)
2034 {
2035 int *valp = ctl->data;
2036 int val = *valp;
2037 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
2038 struct net *net = ctl->extra2;
2039
2040 if (write && *valp != val)
2041 rt_cache_flush(net);
2042
2043 return ret;
2044 }
2045
2046 #define DEVINET_SYSCTL_ENTRY(attr, name, mval, proc) \
2047 { \
2048 .procname = name, \
2049 .data = ipv4_devconf.data + \
2050 IPV4_DEVCONF_ ## attr - 1, \
2051 .maxlen = sizeof(int), \
2052 .mode = mval, \
2053 .proc_handler = proc, \
2054 .extra1 = &ipv4_devconf, \
2055 }
2056
2057 #define DEVINET_SYSCTL_RW_ENTRY(attr, name) \
2058 DEVINET_SYSCTL_ENTRY(attr, name, 0644, devinet_conf_proc)
2059
2060 #define DEVINET_SYSCTL_RO_ENTRY(attr, name) \
2061 DEVINET_SYSCTL_ENTRY(attr, name, 0444, devinet_conf_proc)
2062
2063 #define DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, proc) \
2064 DEVINET_SYSCTL_ENTRY(attr, name, 0644, proc)
2065
2066 #define DEVINET_SYSCTL_FLUSHING_ENTRY(attr, name) \
2067 DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, ipv4_doint_and_flush)
2068
2069 static struct devinet_sysctl_table {
2070 struct ctl_table_header *sysctl_header;
2071 struct ctl_table devinet_vars[__IPV4_DEVCONF_MAX];
2072 } devinet_sysctl = {
2073 .devinet_vars = {
2074 DEVINET_SYSCTL_COMPLEX_ENTRY(FORWARDING, "forwarding",
2075 devinet_sysctl_forward),
2076 DEVINET_SYSCTL_RO_ENTRY(MC_FORWARDING, "mc_forwarding"),
2077
2078 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_REDIRECTS, "accept_redirects"),
2079 DEVINET_SYSCTL_RW_ENTRY(SECURE_REDIRECTS, "secure_redirects"),
2080 DEVINET_SYSCTL_RW_ENTRY(SHARED_MEDIA, "shared_media"),
2081 DEVINET_SYSCTL_RW_ENTRY(RP_FILTER, "rp_filter"),
2082 DEVINET_SYSCTL_RW_ENTRY(SEND_REDIRECTS, "send_redirects"),
2083 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_SOURCE_ROUTE,
2084 "accept_source_route"),
2085 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_LOCAL, "accept_local"),
2086 DEVINET_SYSCTL_RW_ENTRY(SRC_VMARK, "src_valid_mark"),
2087 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP, "proxy_arp"),
2088 DEVINET_SYSCTL_RW_ENTRY(MEDIUM_ID, "medium_id"),
2089 DEVINET_SYSCTL_RW_ENTRY(BOOTP_RELAY, "bootp_relay"),
2090 DEVINET_SYSCTL_RW_ENTRY(LOG_MARTIANS, "log_martians"),
2091 DEVINET_SYSCTL_RW_ENTRY(TAG, "tag"),
2092 DEVINET_SYSCTL_RW_ENTRY(ARPFILTER, "arp_filter"),
2093 DEVINET_SYSCTL_RW_ENTRY(ARP_ANNOUNCE, "arp_announce"),
2094 DEVINET_SYSCTL_RW_ENTRY(ARP_IGNORE, "arp_ignore"),
2095 DEVINET_SYSCTL_RW_ENTRY(ARP_ACCEPT, "arp_accept"),
2096 DEVINET_SYSCTL_RW_ENTRY(ARP_NOTIFY, "arp_notify"),
2097 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP_PVLAN, "proxy_arp_pvlan"),
2098
2099 DEVINET_SYSCTL_FLUSHING_ENTRY(NOXFRM, "disable_xfrm"),
2100 DEVINET_SYSCTL_FLUSHING_ENTRY(NOPOLICY, "disable_policy"),
2101 DEVINET_SYSCTL_FLUSHING_ENTRY(FORCE_IGMP_VERSION,
2102 "force_igmp_version"),
2103 DEVINET_SYSCTL_FLUSHING_ENTRY(PROMOTE_SECONDARIES,
2104 "promote_secondaries"),
2105 DEVINET_SYSCTL_FLUSHING_ENTRY(ROUTE_LOCALNET,
2106 "route_localnet"),
2107 },
2108 };
2109
2110 static int __devinet_sysctl_register(struct net *net, char *dev_name,
2111 struct ipv4_devconf *p)
2112 {
2113 int i;
2114 struct devinet_sysctl_table *t;
2115 char path[sizeof("net/ipv4/conf/") + IFNAMSIZ];
2116
2117 t = kmemdup(&devinet_sysctl, sizeof(*t), GFP_KERNEL);
2118 if (!t)
2119 goto out;
2120
2121 for (i = 0; i < ARRAY_SIZE(t->devinet_vars) - 1; i++) {
2122 t->devinet_vars[i].data += (char *)p - (char *)&ipv4_devconf;
2123 t->devinet_vars[i].extra1 = p;
2124 t->devinet_vars[i].extra2 = net;
2125 }
2126
2127 snprintf(path, sizeof(path), "net/ipv4/conf/%s", dev_name);
2128
2129 t->sysctl_header = register_net_sysctl(net, path, t->devinet_vars);
2130 if (!t->sysctl_header)
2131 goto free;
2132
2133 p->sysctl = t;
2134 return 0;
2135
2136 free:
2137 kfree(t);
2138 out:
2139 return -ENOBUFS;
2140 }
2141
2142 static void __devinet_sysctl_unregister(struct ipv4_devconf *cnf)
2143 {
2144 struct devinet_sysctl_table *t = cnf->sysctl;
2145
2146 if (t == NULL)
2147 return;
2148
2149 cnf->sysctl = NULL;
2150 unregister_net_sysctl_table(t->sysctl_header);
2151 kfree(t);
2152 }
2153
2154 static void devinet_sysctl_register(struct in_device *idev)
2155 {
2156 neigh_sysctl_register(idev->dev, idev->arp_parms, "ipv4", NULL);
2157 __devinet_sysctl_register(dev_net(idev->dev), idev->dev->name,
2158 &idev->cnf);
2159 }
2160
2161 static void devinet_sysctl_unregister(struct in_device *idev)
2162 {
2163 __devinet_sysctl_unregister(&idev->cnf);
2164 neigh_sysctl_unregister(idev->arp_parms);
2165 }
2166
2167 static struct ctl_table ctl_forward_entry[] = {
2168 {
2169 .procname = "ip_forward",
2170 .data = &ipv4_devconf.data[
2171 IPV4_DEVCONF_FORWARDING - 1],
2172 .maxlen = sizeof(int),
2173 .mode = 0644,
2174 .proc_handler = devinet_sysctl_forward,
2175 .extra1 = &ipv4_devconf,
2176 .extra2 = &init_net,
2177 },
2178 { },
2179 };
2180 #endif
2181
2182 static __net_init int devinet_init_net(struct net *net)
2183 {
2184 int err;
2185 struct ipv4_devconf *all, *dflt;
2186 #ifdef CONFIG_SYSCTL
2187 struct ctl_table *tbl = ctl_forward_entry;
2188 struct ctl_table_header *forw_hdr;
2189 #endif
2190
2191 err = -ENOMEM;
2192 all = &ipv4_devconf;
2193 dflt = &ipv4_devconf_dflt;
2194
2195 if (!net_eq(net, &init_net)) {
2196 all = kmemdup(all, sizeof(ipv4_devconf), GFP_KERNEL);
2197 if (all == NULL)
2198 goto err_alloc_all;
2199
2200 dflt = kmemdup(dflt, sizeof(ipv4_devconf_dflt), GFP_KERNEL);
2201 if (dflt == NULL)
2202 goto err_alloc_dflt;
2203
2204 #ifdef CONFIG_SYSCTL
2205 tbl = kmemdup(tbl, sizeof(ctl_forward_entry), GFP_KERNEL);
2206 if (tbl == NULL)
2207 goto err_alloc_ctl;
2208
2209 tbl[0].data = &all->data[IPV4_DEVCONF_FORWARDING - 1];
2210 tbl[0].extra1 = all;
2211 tbl[0].extra2 = net;
2212 #endif
2213 }
2214
2215 #ifdef CONFIG_SYSCTL
2216 err = __devinet_sysctl_register(net, "all", all);
2217 if (err < 0)
2218 goto err_reg_all;
2219
2220 err = __devinet_sysctl_register(net, "default", dflt);
2221 if (err < 0)
2222 goto err_reg_dflt;
2223
2224 err = -ENOMEM;
2225 forw_hdr = register_net_sysctl(net, "net/ipv4", tbl);
2226 if (forw_hdr == NULL)
2227 goto err_reg_ctl;
2228 net->ipv4.forw_hdr = forw_hdr;
2229 #endif
2230
2231 net->ipv4.devconf_all = all;
2232 net->ipv4.devconf_dflt = dflt;
2233 return 0;
2234
2235 #ifdef CONFIG_SYSCTL
2236 err_reg_ctl:
2237 __devinet_sysctl_unregister(dflt);
2238 err_reg_dflt:
2239 __devinet_sysctl_unregister(all);
2240 err_reg_all:
2241 if (tbl != ctl_forward_entry)
2242 kfree(tbl);
2243 err_alloc_ctl:
2244 #endif
2245 if (dflt != &ipv4_devconf_dflt)
2246 kfree(dflt);
2247 err_alloc_dflt:
2248 if (all != &ipv4_devconf)
2249 kfree(all);
2250 err_alloc_all:
2251 return err;
2252 }
2253
2254 static __net_exit void devinet_exit_net(struct net *net)
2255 {
2256 #ifdef CONFIG_SYSCTL
2257 struct ctl_table *tbl;
2258
2259 tbl = net->ipv4.forw_hdr->ctl_table_arg;
2260 unregister_net_sysctl_table(net->ipv4.forw_hdr);
2261 __devinet_sysctl_unregister(net->ipv4.devconf_dflt);
2262 __devinet_sysctl_unregister(net->ipv4.devconf_all);
2263 kfree(tbl);
2264 #endif
2265 kfree(net->ipv4.devconf_dflt);
2266 kfree(net->ipv4.devconf_all);
2267 }
2268
2269 static __net_initdata struct pernet_operations devinet_ops = {
2270 .init = devinet_init_net,
2271 .exit = devinet_exit_net,
2272 };
2273
2274 static struct rtnl_af_ops inet_af_ops = {
2275 .family = AF_INET,
2276 .fill_link_af = inet_fill_link_af,
2277 .get_link_af_size = inet_get_link_af_size,
2278 .validate_link_af = inet_validate_link_af,
2279 .set_link_af = inet_set_link_af,
2280 };
2281
2282 void __init devinet_init(void)
2283 {
2284 int i;
2285
2286 for (i = 0; i < IN4_ADDR_HSIZE; i++)
2287 INIT_HLIST_HEAD(&inet_addr_lst[i]);
2288
2289 register_pernet_subsys(&devinet_ops);
2290
2291 register_gifconf(PF_INET, inet_gifconf);
2292 register_netdevice_notifier(&ip_netdev_notifier);
2293
2294 schedule_delayed_work(&check_lifetime_work, 0);
2295
2296 rtnl_af_register(&inet_af_ops);
2297
2298 rtnl_register(PF_INET, RTM_NEWADDR, inet_rtm_newaddr, NULL, NULL);
2299 rtnl_register(PF_INET, RTM_DELADDR, inet_rtm_deladdr, NULL, NULL);
2300 rtnl_register(PF_INET, RTM_GETADDR, NULL, inet_dump_ifaddr, NULL);
2301 rtnl_register(PF_INET, RTM_GETNETCONF, inet_netconf_get_devconf,
2302 inet_netconf_dump_devconf, NULL);
2303 }
2304
Linus' kernel tree