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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 <asm/system.h>
31#include <linux/bitops.h>
32#include <linux/capability.h>
33#include <linux/module.h>
34#include <linux/types.h>
35#include <linux/kernel.h>
36#include <linux/string.h>
37#include <linux/mm.h>
38#include <linux/socket.h>
39#include <linux/sockios.h>
40#include <linux/in.h>
41#include <linux/errno.h>
42#include <linux/interrupt.h>
43#include <linux/if_addr.h>
44#include <linux/if_ether.h>
45#include <linux/inet.h>
46#include <linux/netdevice.h>
47#include <linux/etherdevice.h>
48#include <linux/skbuff.h>
49#include <linux/init.h>
50#include <linux/notifier.h>
51#include <linux/inetdevice.h>
52#include <linux/igmp.h>
53#include <linux/slab.h>
54#include <linux/hash.h>
55#ifdef CONFIG_SYSCTL
56#include <linux/sysctl.h>
57#endif
58#include <linux/kmod.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
67#include "fib_lookup.h"
68
69static struct ipv4_devconf ipv4_devconf = {
70 .data = {
71 [IPV4_DEVCONF_ACCEPT_REDIRECTS - 1] = 1,
72 [IPV4_DEVCONF_SEND_REDIRECTS - 1] = 1,
73 [IPV4_DEVCONF_SECURE_REDIRECTS - 1] = 1,
74 [IPV4_DEVCONF_SHARED_MEDIA - 1] = 1,
75 },
76};
77
78static struct ipv4_devconf ipv4_devconf_dflt = {
79 .data = {
80 [IPV4_DEVCONF_ACCEPT_REDIRECTS - 1] = 1,
81 [IPV4_DEVCONF_SEND_REDIRECTS - 1] = 1,
82 [IPV4_DEVCONF_SECURE_REDIRECTS - 1] = 1,
83 [IPV4_DEVCONF_SHARED_MEDIA - 1] = 1,
84 [IPV4_DEVCONF_ACCEPT_SOURCE_ROUTE - 1] = 1,
85 },
86};
87
88#define IPV4_DEVCONF_DFLT(net, attr) \
89 IPV4_DEVCONF((*net->ipv4.devconf_dflt), attr)
90
91static const struct nla_policy ifa_ipv4_policy[IFA_MAX+1] = {
92 [IFA_LOCAL] = { .type = NLA_U32 },
93 [IFA_ADDRESS] = { .type = NLA_U32 },
94 [IFA_BROADCAST] = { .type = NLA_U32 },
95 [IFA_LABEL] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 },
96};
97
98/* inet_addr_hash's shifting is dependent upon this IN4_ADDR_HSIZE
99 * value. So if you change this define, make appropriate changes to
100 * inet_addr_hash as well.
101 */
102#define IN4_ADDR_HSIZE 256
103static struct hlist_head inet_addr_lst[IN4_ADDR_HSIZE];
104static DEFINE_SPINLOCK(inet_addr_hash_lock);
105
106static inline unsigned int inet_addr_hash(struct net *net, __be32 addr)
107{
108 u32 val = (__force u32) addr ^ hash_ptr(net, 8);
109
110 return ((val ^ (val >> 8) ^ (val >> 16) ^ (val >> 24)) &
111 (IN4_ADDR_HSIZE - 1));
112}
113
114static void inet_hash_insert(struct net *net, struct in_ifaddr *ifa)
115{
116 unsigned int hash = inet_addr_hash(net, ifa->ifa_local);
117
118 spin_lock(&inet_addr_hash_lock);
119 hlist_add_head_rcu(&ifa->hash, &inet_addr_lst[hash]);
120 spin_unlock(&inet_addr_hash_lock);
121}
122
123static void inet_hash_remove(struct in_ifaddr *ifa)
124{
125 spin_lock(&inet_addr_hash_lock);
126 hlist_del_init_rcu(&ifa->hash);
127 spin_unlock(&inet_addr_hash_lock);
128}
129
130/**
131 * __ip_dev_find - find the first device with a given source address.
132 * @net: the net namespace
133 * @addr: the source address
134 * @devref: if true, take a reference on the found device
135 *
136 * If a caller uses devref=false, it should be protected by RCU, or RTNL
137 */
138struct net_device *__ip_dev_find(struct net *net, __be32 addr, bool devref)
139{
140 unsigned int hash = inet_addr_hash(net, addr);
141 struct net_device *result = NULL;
142 struct in_ifaddr *ifa;
143 struct hlist_node *node;
144
145 rcu_read_lock();
146 hlist_for_each_entry_rcu(ifa, node, &inet_addr_lst[hash], hash) {
147 struct net_device *dev = ifa->ifa_dev->dev;
148
149 if (!net_eq(dev_net(dev), net))
150 continue;
151 if (ifa->ifa_local == addr) {
152 result = dev;
153 break;
154 }
155 }
156 if (!result) {
157 struct flowi4 fl4 = { .daddr = addr };
158 struct fib_result res = { 0 };
159 struct fib_table *local;
160
161 /* Fallback to FIB local table so that communication
162 * over loopback subnets work.
163 */
164 local = fib_get_table(net, RT_TABLE_LOCAL);
165 if (local &&
166 !fib_table_lookup(local, &fl4, &res, FIB_LOOKUP_NOREF) &&
167 res.type == RTN_LOCAL)
168 result = FIB_RES_DEV(res);
169 }
170 if (result && devref)
171 dev_hold(result);
172 rcu_read_unlock();
173 return result;
174}
175EXPORT_SYMBOL(__ip_dev_find);
176
177static void rtmsg_ifa(int event, struct in_ifaddr *, struct nlmsghdr *, u32);
178
179static BLOCKING_NOTIFIER_HEAD(inetaddr_chain);
180static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
181 int destroy);
182#ifdef CONFIG_SYSCTL
183static void devinet_sysctl_register(struct in_device *idev);
184static void devinet_sysctl_unregister(struct in_device *idev);
185#else
186static inline void devinet_sysctl_register(struct in_device *idev)
187{
188}
189static inline void devinet_sysctl_unregister(struct in_device *idev)
190{
191}
192#endif
193
194/* Locks all the inet devices. */
195
196static struct in_ifaddr *inet_alloc_ifa(void)
197{
198 return kzalloc(sizeof(struct in_ifaddr), GFP_KERNEL);
199}
200
201static void inet_rcu_free_ifa(struct rcu_head *head)
202{
203 struct in_ifaddr *ifa = container_of(head, struct in_ifaddr, rcu_head);
204 if (ifa->ifa_dev)
205 in_dev_put(ifa->ifa_dev);
206 kfree(ifa);
207}
208
209static inline void inet_free_ifa(struct in_ifaddr *ifa)
210{
211 call_rcu(&ifa->rcu_head, inet_rcu_free_ifa);
212}
213
214void in_dev_finish_destroy(struct in_device *idev)
215{
216 struct net_device *dev = idev->dev;
217
218 WARN_ON(idev->ifa_list);
219 WARN_ON(idev->mc_list);
220#ifdef NET_REFCNT_DEBUG
221 printk(KERN_DEBUG "in_dev_finish_destroy: %p=%s\n",
222 idev, dev ? dev->name : "NIL");
223#endif
224 dev_put(dev);
225 if (!idev->dead)
226 pr_err("Freeing alive in_device %p\n", idev);
227 else
228 kfree(idev);
229}
230EXPORT_SYMBOL(in_dev_finish_destroy);
231
232static struct in_device *inetdev_init(struct net_device *dev)
233{
234 struct in_device *in_dev;
235
236 ASSERT_RTNL();
237
238 in_dev = kzalloc(sizeof(*in_dev), GFP_KERNEL);
239 if (!in_dev)
240 goto out;
241 memcpy(&in_dev->cnf, dev_net(dev)->ipv4.devconf_dflt,
242 sizeof(in_dev->cnf));
243 in_dev->cnf.sysctl = NULL;
244 in_dev->dev = dev;
245 in_dev->arp_parms = neigh_parms_alloc(dev, &arp_tbl);
246 if (!in_dev->arp_parms)
247 goto out_kfree;
248 if (IPV4_DEVCONF(in_dev->cnf, FORWARDING))
249 dev_disable_lro(dev);
250 /* Reference in_dev->dev */
251 dev_hold(dev);
252 /* Account for reference dev->ip_ptr (below) */
253 in_dev_hold(in_dev);
254
255 devinet_sysctl_register(in_dev);
256 ip_mc_init_dev(in_dev);
257 if (dev->flags & IFF_UP)
258 ip_mc_up(in_dev);
259
260 /* we can receive as soon as ip_ptr is set -- do this last */
261 rcu_assign_pointer(dev->ip_ptr, in_dev);
262out:
263 return in_dev;
264out_kfree:
265 kfree(in_dev);
266 in_dev = NULL;
267 goto out;
268}
269
270static void in_dev_rcu_put(struct rcu_head *head)
271{
272 struct in_device *idev = container_of(head, struct in_device, rcu_head);
273 in_dev_put(idev);
274}
275
276static void inetdev_destroy(struct in_device *in_dev)
277{
278 struct in_ifaddr *ifa;
279 struct net_device *dev;
280
281 ASSERT_RTNL();
282
283 dev = in_dev->dev;
284
285 in_dev->dead = 1;
286
287 ip_mc_destroy_dev(in_dev);
288
289 while ((ifa = in_dev->ifa_list) != NULL) {
290 inet_del_ifa(in_dev, &in_dev->ifa_list, 0);
291 inet_free_ifa(ifa);
292 }
293
294 rcu_assign_pointer(dev->ip_ptr, NULL);
295
296 devinet_sysctl_unregister(in_dev);
297 neigh_parms_release(&arp_tbl, in_dev->arp_parms);
298 arp_ifdown(dev);
299
300 call_rcu(&in_dev->rcu_head, in_dev_rcu_put);
301}
302
303int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b)
304{
305 rcu_read_lock();
306 for_primary_ifa(in_dev) {
307 if (inet_ifa_match(a, ifa)) {
308 if (!b || inet_ifa_match(b, ifa)) {
309 rcu_read_unlock();
310 return 1;
311 }
312 }
313 } endfor_ifa(in_dev);
314 rcu_read_unlock();
315 return 0;
316}
317
318static void __inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
319 int destroy, struct nlmsghdr *nlh, u32 pid)
320{
321 struct in_ifaddr *promote = NULL;
322 struct in_ifaddr *ifa, *ifa1 = *ifap;
323 struct in_ifaddr *last_prim = in_dev->ifa_list;
324 struct in_ifaddr *prev_prom = NULL;
325 int do_promote = IN_DEV_PROMOTE_SECONDARIES(in_dev);
326
327 ASSERT_RTNL();
328
329 /* 1. Deleting primary ifaddr forces deletion all secondaries
330 * unless alias promotion is set
331 **/
332
333 if (!(ifa1->ifa_flags & IFA_F_SECONDARY)) {
334 struct in_ifaddr **ifap1 = &ifa1->ifa_next;
335
336 while ((ifa = *ifap1) != NULL) {
337 if (!(ifa->ifa_flags & IFA_F_SECONDARY) &&
338 ifa1->ifa_scope <= ifa->ifa_scope)
339 last_prim = ifa;
340
341 if (!(ifa->ifa_flags & IFA_F_SECONDARY) ||
342 ifa1->ifa_mask != ifa->ifa_mask ||
343 !inet_ifa_match(ifa1->ifa_address, ifa)) {
344 ifap1 = &ifa->ifa_next;
345 prev_prom = ifa;
346 continue;
347 }
348
349 if (!do_promote) {
350 inet_hash_remove(ifa);
351 *ifap1 = ifa->ifa_next;
352
353 rtmsg_ifa(RTM_DELADDR, ifa, nlh, pid);
354 blocking_notifier_call_chain(&inetaddr_chain,
355 NETDEV_DOWN, ifa);
356 inet_free_ifa(ifa);
357 } else {
358 promote = ifa;
359 break;
360 }
361 }
362 }
363
364 /* On promotion all secondaries from subnet are changing
365 * the primary IP, we must remove all their routes silently
366 * and later to add them back with new prefsrc. Do this
367 * while all addresses are on the device list.
368 */
369 for (ifa = promote; ifa; ifa = ifa->ifa_next) {
370 if (ifa1->ifa_mask == ifa->ifa_mask &&
371 inet_ifa_match(ifa1->ifa_address, ifa))
372 fib_del_ifaddr(ifa, ifa1);
373 }
374
375 /* 2. Unlink it */
376
377 *ifap = ifa1->ifa_next;
378 inet_hash_remove(ifa1);
379
380 /* 3. Announce address deletion */
381
382 /* Send message first, then call notifier.
383 At first sight, FIB update triggered by notifier
384 will refer to already deleted ifaddr, that could confuse
385 netlink listeners. It is not true: look, gated sees
386 that route deleted and if it still thinks that ifaddr
387 is valid, it will try to restore deleted routes... Grr.
388 So that, this order is correct.
389 */
390 rtmsg_ifa(RTM_DELADDR, ifa1, nlh, pid);
391 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa1);
392
393 if (promote) {
394 struct in_ifaddr *next_sec = promote->ifa_next;
395
396 if (prev_prom) {
397 prev_prom->ifa_next = promote->ifa_next;
398 promote->ifa_next = last_prim->ifa_next;
399 last_prim->ifa_next = promote;
400 }
401
402 promote->ifa_flags &= ~IFA_F_SECONDARY;
403 rtmsg_ifa(RTM_NEWADDR, promote, nlh, pid);
404 blocking_notifier_call_chain(&inetaddr_chain,
405 NETDEV_UP, promote);
406 for (ifa = next_sec; ifa; ifa = ifa->ifa_next) {
407 if (ifa1->ifa_mask != ifa->ifa_mask ||
408 !inet_ifa_match(ifa1->ifa_address, ifa))
409 continue;
410 fib_add_ifaddr(ifa);
411 }
412
413 }
414 if (destroy)
415 inet_free_ifa(ifa1);
416}
417
418static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
419 int destroy)
420{
421 __inet_del_ifa(in_dev, ifap, destroy, NULL, 0);
422}
423
424static int __inet_insert_ifa(struct in_ifaddr *ifa, struct nlmsghdr *nlh,
425 u32 pid)
426{
427 struct in_device *in_dev = ifa->ifa_dev;
428 struct in_ifaddr *ifa1, **ifap, **last_primary;
429
430 ASSERT_RTNL();
431
432 if (!ifa->ifa_local) {
433 inet_free_ifa(ifa);
434 return 0;
435 }
436
437 ifa->ifa_flags &= ~IFA_F_SECONDARY;
438 last_primary = &in_dev->ifa_list;
439
440 for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL;
441 ifap = &ifa1->ifa_next) {
442 if (!(ifa1->ifa_flags & IFA_F_SECONDARY) &&
443 ifa->ifa_scope <= ifa1->ifa_scope)
444 last_primary = &ifa1->ifa_next;
445 if (ifa1->ifa_mask == ifa->ifa_mask &&
446 inet_ifa_match(ifa1->ifa_address, ifa)) {
447 if (ifa1->ifa_local == ifa->ifa_local) {
448 inet_free_ifa(ifa);
449 return -EEXIST;
450 }
451 if (ifa1->ifa_scope != ifa->ifa_scope) {
452 inet_free_ifa(ifa);
453 return -EINVAL;
454 }
455 ifa->ifa_flags |= IFA_F_SECONDARY;
456 }
457 }
458
459 if (!(ifa->ifa_flags & IFA_F_SECONDARY)) {
460 net_srandom(ifa->ifa_local);
461 ifap = last_primary;
462 }
463
464 ifa->ifa_next = *ifap;
465 *ifap = ifa;
466
467 inet_hash_insert(dev_net(in_dev->dev), ifa);
468
469 /* Send message first, then call notifier.
470 Notifier will trigger FIB update, so that
471 listeners of netlink will know about new ifaddr */
472 rtmsg_ifa(RTM_NEWADDR, ifa, nlh, pid);
473 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa);
474
475 return 0;
476}
477
478static int inet_insert_ifa(struct in_ifaddr *ifa)
479{
480 return __inet_insert_ifa(ifa, NULL, 0);
481}
482
483static int inet_set_ifa(struct net_device *dev, struct in_ifaddr *ifa)
484{
485 struct in_device *in_dev = __in_dev_get_rtnl(dev);
486
487 ASSERT_RTNL();
488
489 if (!in_dev) {
490 inet_free_ifa(ifa);
491 return -ENOBUFS;
492 }
493 ipv4_devconf_setall(in_dev);
494 if (ifa->ifa_dev != in_dev) {
495 WARN_ON(ifa->ifa_dev);
496 in_dev_hold(in_dev);
497 ifa->ifa_dev = in_dev;
498 }
499 if (ipv4_is_loopback(ifa->ifa_local))
500 ifa->ifa_scope = RT_SCOPE_HOST;
501 return inet_insert_ifa(ifa);
502}
503
504/* Caller must hold RCU or RTNL :
505 * We dont take a reference on found in_device
506 */
507struct in_device *inetdev_by_index(struct net *net, int ifindex)
508{
509 struct net_device *dev;
510 struct in_device *in_dev = NULL;
511
512 rcu_read_lock();
513 dev = dev_get_by_index_rcu(net, ifindex);
514 if (dev)
515 in_dev = rcu_dereference_rtnl(dev->ip_ptr);
516 rcu_read_unlock();
517 return in_dev;
518}
519EXPORT_SYMBOL(inetdev_by_index);
520
521/* Called only from RTNL semaphored context. No locks. */
522
523struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix,
524 __be32 mask)
525{
526 ASSERT_RTNL();
527
528 for_primary_ifa(in_dev) {
529 if (ifa->ifa_mask == mask && inet_ifa_match(prefix, ifa))
530 return ifa;
531 } endfor_ifa(in_dev);
532 return NULL;
533}
534
535static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
536{
537 struct net *net = sock_net(skb->sk);
538 struct nlattr *tb[IFA_MAX+1];
539 struct in_device *in_dev;
540 struct ifaddrmsg *ifm;
541 struct in_ifaddr *ifa, **ifap;
542 int err = -EINVAL;
543
544 ASSERT_RTNL();
545
546 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy);
547 if (err < 0)
548 goto errout;
549
550 ifm = nlmsg_data(nlh);
551 in_dev = inetdev_by_index(net, ifm->ifa_index);
552 if (in_dev == NULL) {
553 err = -ENODEV;
554 goto errout;
555 }
556
557 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
558 ifap = &ifa->ifa_next) {
559 if (tb[IFA_LOCAL] &&
560 ifa->ifa_local != nla_get_be32(tb[IFA_LOCAL]))
561 continue;
562
563 if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label))
564 continue;
565
566 if (tb[IFA_ADDRESS] &&
567 (ifm->ifa_prefixlen != ifa->ifa_prefixlen ||
568 !inet_ifa_match(nla_get_be32(tb[IFA_ADDRESS]), ifa)))
569 continue;
570
571 __inet_del_ifa(in_dev, ifap, 1, nlh, NETLINK_CB(skb).pid);
572 return 0;
573 }
574
575 err = -EADDRNOTAVAIL;
576errout:
577 return err;
578}
579
580static struct in_ifaddr *rtm_to_ifaddr(struct net *net, struct nlmsghdr *nlh)
581{
582 struct nlattr *tb[IFA_MAX+1];
583 struct in_ifaddr *ifa;
584 struct ifaddrmsg *ifm;
585 struct net_device *dev;
586 struct in_device *in_dev;
587 int err;
588
589 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy);
590 if (err < 0)
591 goto errout;
592
593 ifm = nlmsg_data(nlh);
594 err = -EINVAL;
595 if (ifm->ifa_prefixlen > 32 || tb[IFA_LOCAL] == NULL)
596 goto errout;
597
598 dev = __dev_get_by_index(net, ifm->ifa_index);
599 err = -ENODEV;
600 if (dev == NULL)
601 goto errout;
602
603 in_dev = __in_dev_get_rtnl(dev);
604 err = -ENOBUFS;
605 if (in_dev == NULL)
606 goto errout;
607
608 ifa = inet_alloc_ifa();
609 if (ifa == NULL)
610 /*
611 * A potential indev allocation can be left alive, it stays
612 * assigned to its device and is destroy with it.
613 */
614 goto errout;
615
616 ipv4_devconf_setall(in_dev);
617 in_dev_hold(in_dev);
618
619 if (tb[IFA_ADDRESS] == NULL)
620 tb[IFA_ADDRESS] = tb[IFA_LOCAL];
621
622 INIT_HLIST_NODE(&ifa->hash);
623 ifa->ifa_prefixlen = ifm->ifa_prefixlen;
624 ifa->ifa_mask = inet_make_mask(ifm->ifa_prefixlen);
625 ifa->ifa_flags = ifm->ifa_flags;
626 ifa->ifa_scope = ifm->ifa_scope;
627 ifa->ifa_dev = in_dev;
628
629 ifa->ifa_local = nla_get_be32(tb[IFA_LOCAL]);
630 ifa->ifa_address = nla_get_be32(tb[IFA_ADDRESS]);
631
632 if (tb[IFA_BROADCAST])
633 ifa->ifa_broadcast = nla_get_be32(tb[IFA_BROADCAST]);
634
635 if (tb[IFA_LABEL])
636 nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ);
637 else
638 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
639
640 return ifa;
641
642errout:
643 return ERR_PTR(err);
644}
645
646static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
647{
648 struct net *net = sock_net(skb->sk);
649 struct in_ifaddr *ifa;
650
651 ASSERT_RTNL();
652
653 ifa = rtm_to_ifaddr(net, nlh);
654 if (IS_ERR(ifa))
655 return PTR_ERR(ifa);
656
657 return __inet_insert_ifa(ifa, nlh, NETLINK_CB(skb).pid);
658}
659
660/*
661 * Determine a default network mask, based on the IP address.
662 */
663
664static inline int inet_abc_len(__be32 addr)
665{
666 int rc = -1; /* Something else, probably a multicast. */
667
668 if (ipv4_is_zeronet(addr))
669 rc = 0;
670 else {
671 __u32 haddr = ntohl(addr);
672
673 if (IN_CLASSA(haddr))
674 rc = 8;
675 else if (IN_CLASSB(haddr))
676 rc = 16;
677 else if (IN_CLASSC(haddr))
678 rc = 24;
679 }
680
681 return rc;
682}
683
684
685int devinet_ioctl(struct net *net, unsigned int cmd, void __user *arg)
686{
687 struct ifreq ifr;
688 struct sockaddr_in sin_orig;
689 struct sockaddr_in *sin = (struct sockaddr_in *)&ifr.ifr_addr;
690 struct in_device *in_dev;
691 struct in_ifaddr **ifap = NULL;
692 struct in_ifaddr *ifa = NULL;
693 struct net_device *dev;
694 char *colon;
695 int ret = -EFAULT;
696 int tryaddrmatch = 0;
697
698 /*
699 * Fetch the caller's info block into kernel space
700 */
701
702 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
703 goto out;
704 ifr.ifr_name[IFNAMSIZ - 1] = 0;
705
706 /* save original address for comparison */
707 memcpy(&sin_orig, sin, sizeof(*sin));
708
709 colon = strchr(ifr.ifr_name, ':');
710 if (colon)
711 *colon = 0;
712
713 dev_load(net, ifr.ifr_name);
714
715 switch (cmd) {
716 case SIOCGIFADDR: /* Get interface address */
717 case SIOCGIFBRDADDR: /* Get the broadcast address */
718 case SIOCGIFDSTADDR: /* Get the destination address */
719 case SIOCGIFNETMASK: /* Get the netmask for the interface */
720 /* Note that these ioctls will not sleep,
721 so that we do not impose a lock.
722 One day we will be forced to put shlock here (I mean SMP)
723 */
724 tryaddrmatch = (sin_orig.sin_family == AF_INET);
725 memset(sin, 0, sizeof(*sin));
726 sin->sin_family = AF_INET;
727 break;
728
729 case SIOCSIFFLAGS:
730 ret = -EACCES;
731 if (!capable(CAP_NET_ADMIN))
732 goto out;
733 break;
734 case SIOCSIFADDR: /* Set interface address (and family) */
735 case SIOCSIFBRDADDR: /* Set the broadcast address */
736 case SIOCSIFDSTADDR: /* Set the destination address */
737 case SIOCSIFNETMASK: /* Set the netmask for the interface */
738 ret = -EACCES;
739 if (!capable(CAP_NET_ADMIN))
740 goto out;
741 ret = -EINVAL;
742 if (sin->sin_family != AF_INET)
743 goto out;
744 break;
745 default:
746 ret = -EINVAL;
747 goto out;
748 }
749
750 rtnl_lock();
751
752 ret = -ENODEV;
753 dev = __dev_get_by_name(net, ifr.ifr_name);
754 if (!dev)
755 goto done;
756
757 if (colon)
758 *colon = ':';
759
760 in_dev = __in_dev_get_rtnl(dev);
761 if (in_dev) {
762 if (tryaddrmatch) {
763 /* Matthias Andree */
764 /* compare label and address (4.4BSD style) */
765 /* note: we only do this for a limited set of ioctls
766 and only if the original address family was AF_INET.
767 This is checked above. */
768 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
769 ifap = &ifa->ifa_next) {
770 if (!strcmp(ifr.ifr_name, ifa->ifa_label) &&
771 sin_orig.sin_addr.s_addr ==
772 ifa->ifa_local) {
773 break; /* found */
774 }
775 }
776 }
777 /* we didn't get a match, maybe the application is
778 4.3BSD-style and passed in junk so we fall back to
779 comparing just the label */
780 if (!ifa) {
781 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
782 ifap = &ifa->ifa_next)
783 if (!strcmp(ifr.ifr_name, ifa->ifa_label))
784 break;
785 }
786 }
787
788 ret = -EADDRNOTAVAIL;
789 if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS)
790 goto done;
791
792 switch (cmd) {
793 case SIOCGIFADDR: /* Get interface address */
794 sin->sin_addr.s_addr = ifa->ifa_local;
795 goto rarok;
796
797 case SIOCGIFBRDADDR: /* Get the broadcast address */
798 sin->sin_addr.s_addr = ifa->ifa_broadcast;
799 goto rarok;
800
801 case SIOCGIFDSTADDR: /* Get the destination address */
802 sin->sin_addr.s_addr = ifa->ifa_address;
803 goto rarok;
804
805 case SIOCGIFNETMASK: /* Get the netmask for the interface */
806 sin->sin_addr.s_addr = ifa->ifa_mask;
807 goto rarok;
808
809 case SIOCSIFFLAGS:
810 if (colon) {
811 ret = -EADDRNOTAVAIL;
812 if (!ifa)
813 break;
814 ret = 0;
815 if (!(ifr.ifr_flags & IFF_UP))
816 inet_del_ifa(in_dev, ifap, 1);
817 break;
818 }
819 ret = dev_change_flags(dev, ifr.ifr_flags);
820 break;
821
822 case SIOCSIFADDR: /* Set interface address (and family) */
823 ret = -EINVAL;
824 if (inet_abc_len(sin->sin_addr.s_addr) < 0)
825 break;
826
827 if (!ifa) {
828 ret = -ENOBUFS;
829 ifa = inet_alloc_ifa();
830 INIT_HLIST_NODE(&ifa->hash);
831 if (!ifa)
832 break;
833 if (colon)
834 memcpy(ifa->ifa_label, ifr.ifr_name, IFNAMSIZ);
835 else
836 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
837 } else {
838 ret = 0;
839 if (ifa->ifa_local == sin->sin_addr.s_addr)
840 break;
841 inet_del_ifa(in_dev, ifap, 0);
842 ifa->ifa_broadcast = 0;
843 ifa->ifa_scope = 0;
844 }
845
846 ifa->ifa_address = ifa->ifa_local = sin->sin_addr.s_addr;
847
848 if (!(dev->flags & IFF_POINTOPOINT)) {
849 ifa->ifa_prefixlen = inet_abc_len(ifa->ifa_address);
850 ifa->ifa_mask = inet_make_mask(ifa->ifa_prefixlen);
851 if ((dev->flags & IFF_BROADCAST) &&
852 ifa->ifa_prefixlen < 31)
853 ifa->ifa_broadcast = ifa->ifa_address |
854 ~ifa->ifa_mask;
855 } else {
856 ifa->ifa_prefixlen = 32;
857 ifa->ifa_mask = inet_make_mask(32);
858 }
859 ret = inet_set_ifa(dev, ifa);
860 break;
861
862 case SIOCSIFBRDADDR: /* Set the broadcast address */
863 ret = 0;
864 if (ifa->ifa_broadcast != sin->sin_addr.s_addr) {
865 inet_del_ifa(in_dev, ifap, 0);
866 ifa->ifa_broadcast = sin->sin_addr.s_addr;
867 inet_insert_ifa(ifa);
868 }
869 break;
870
871 case SIOCSIFDSTADDR: /* Set the destination address */
872 ret = 0;
873 if (ifa->ifa_address == sin->sin_addr.s_addr)
874 break;
875 ret = -EINVAL;
876 if (inet_abc_len(sin->sin_addr.s_addr) < 0)
877 break;
878 ret = 0;
879 inet_del_ifa(in_dev, ifap, 0);
880 ifa->ifa_address = sin->sin_addr.s_addr;
881 inet_insert_ifa(ifa);
882 break;
883
884 case SIOCSIFNETMASK: /* Set the netmask for the interface */
885
886 /*
887 * The mask we set must be legal.
888 */
889 ret = -EINVAL;
890 if (bad_mask(sin->sin_addr.s_addr, 0))
891 break;
892 ret = 0;
893 if (ifa->ifa_mask != sin->sin_addr.s_addr) {
894 __be32 old_mask = ifa->ifa_mask;
895 inet_del_ifa(in_dev, ifap, 0);
896 ifa->ifa_mask = sin->sin_addr.s_addr;
897 ifa->ifa_prefixlen = inet_mask_len(ifa->ifa_mask);
898
899 /* See if current broadcast address matches
900 * with current netmask, then recalculate
901 * the broadcast address. Otherwise it's a
902 * funny address, so don't touch it since
903 * the user seems to know what (s)he's doing...
904 */
905 if ((dev->flags & IFF_BROADCAST) &&
906 (ifa->ifa_prefixlen < 31) &&
907 (ifa->ifa_broadcast ==
908 (ifa->ifa_local|~old_mask))) {
909 ifa->ifa_broadcast = (ifa->ifa_local |
910 ~sin->sin_addr.s_addr);
911 }
912 inet_insert_ifa(ifa);
913 }
914 break;
915 }
916done:
917 rtnl_unlock();
918out:
919 return ret;
920rarok:
921 rtnl_unlock();
922 ret = copy_to_user(arg, &ifr, sizeof(struct ifreq)) ? -EFAULT : 0;
923 goto out;
924}
925
926static int inet_gifconf(struct net_device *dev, char __user *buf, int len)
927{
928 struct in_device *in_dev = __in_dev_get_rtnl(dev);
929 struct in_ifaddr *ifa;
930 struct ifreq ifr;
931 int done = 0;
932
933 if (!in_dev)
934 goto out;
935
936 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
937 if (!buf) {
938 done += sizeof(ifr);
939 continue;
940 }
941 if (len < (int) sizeof(ifr))
942 break;
943 memset(&ifr, 0, sizeof(struct ifreq));
944 if (ifa->ifa_label)
945 strcpy(ifr.ifr_name, ifa->ifa_label);
946 else
947 strcpy(ifr.ifr_name, dev->name);
948
949 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_family = AF_INET;
950 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_addr.s_addr =
951 ifa->ifa_local;
952
953 if (copy_to_user(buf, &ifr, sizeof(struct ifreq))) {
954 done = -EFAULT;
955 break;
956 }
957 buf += sizeof(struct ifreq);
958 len -= sizeof(struct ifreq);
959 done += sizeof(struct ifreq);
960 }
961out:
962 return done;
963}
964
965__be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope)
966{
967 __be32 addr = 0;
968 struct in_device *in_dev;
969 struct net *net = dev_net(dev);
970
971 rcu_read_lock();
972 in_dev = __in_dev_get_rcu(dev);
973 if (!in_dev)
974 goto no_in_dev;
975
976 for_primary_ifa(in_dev) {
977 if (ifa->ifa_scope > scope)
978 continue;
979 if (!dst || inet_ifa_match(dst, ifa)) {
980 addr = ifa->ifa_local;
981 break;
982 }
983 if (!addr)
984 addr = ifa->ifa_local;
985 } endfor_ifa(in_dev);
986
987 if (addr)
988 goto out_unlock;
989no_in_dev:
990
991 /* Not loopback addresses on loopback should be preferred
992 in this case. It is importnat that lo is the first interface
993 in dev_base list.
994 */
995 for_each_netdev_rcu(net, dev) {
996 in_dev = __in_dev_get_rcu(dev);
997 if (!in_dev)
998 continue;
999
1000 for_primary_ifa(in_dev) {
1001 if (ifa->ifa_scope != RT_SCOPE_LINK &&
1002 ifa->ifa_scope <= scope) {
1003 addr = ifa->ifa_local;
1004 goto out_unlock;
1005 }
1006 } endfor_ifa(in_dev);
1007 }
1008out_unlock:
1009 rcu_read_unlock();
1010 return addr;
1011}
1012EXPORT_SYMBOL(inet_select_addr);
1013
1014static __be32 confirm_addr_indev(struct in_device *in_dev, __be32 dst,
1015 __be32 local, int scope)
1016{
1017 int same = 0;
1018 __be32 addr = 0;
1019
1020 for_ifa(in_dev) {
1021 if (!addr &&
1022 (local == ifa->ifa_local || !local) &&
1023 ifa->ifa_scope <= scope) {
1024 addr = ifa->ifa_local;
1025 if (same)
1026 break;
1027 }
1028 if (!same) {
1029 same = (!local || inet_ifa_match(local, ifa)) &&
1030 (!dst || inet_ifa_match(dst, ifa));
1031 if (same && addr) {
1032 if (local || !dst)
1033 break;
1034 /* Is the selected addr into dst subnet? */
1035 if (inet_ifa_match(addr, ifa))
1036 break;
1037 /* No, then can we use new local src? */
1038 if (ifa->ifa_scope <= scope) {
1039 addr = ifa->ifa_local;
1040 break;
1041 }
1042 /* search for large dst subnet for addr */
1043 same = 0;
1044 }
1045 }
1046 } endfor_ifa(in_dev);
1047
1048 return same ? addr : 0;
1049}
1050
1051/*
1052 * Confirm that local IP address exists using wildcards:
1053 * - in_dev: only on this interface, 0=any interface
1054 * - dst: only in the same subnet as dst, 0=any dst
1055 * - local: address, 0=autoselect the local address
1056 * - scope: maximum allowed scope value for the local address
1057 */
1058__be32 inet_confirm_addr(struct in_device *in_dev,
1059 __be32 dst, __be32 local, int scope)
1060{
1061 __be32 addr = 0;
1062 struct net_device *dev;
1063 struct net *net;
1064
1065 if (scope != RT_SCOPE_LINK)
1066 return confirm_addr_indev(in_dev, dst, local, scope);
1067
1068 net = dev_net(in_dev->dev);
1069 rcu_read_lock();
1070 for_each_netdev_rcu(net, dev) {
1071 in_dev = __in_dev_get_rcu(dev);
1072 if (in_dev) {
1073 addr = confirm_addr_indev(in_dev, dst, local, scope);
1074 if (addr)
1075 break;
1076 }
1077 }
1078 rcu_read_unlock();
1079
1080 return addr;
1081}
1082
1083/*
1084 * Device notifier
1085 */
1086
1087int register_inetaddr_notifier(struct notifier_block *nb)
1088{
1089 return blocking_notifier_chain_register(&inetaddr_chain, nb);
1090}
1091EXPORT_SYMBOL(register_inetaddr_notifier);
1092
1093int unregister_inetaddr_notifier(struct notifier_block *nb)
1094{
1095 return blocking_notifier_chain_unregister(&inetaddr_chain, nb);
1096}
1097EXPORT_SYMBOL(unregister_inetaddr_notifier);
1098
1099/* Rename ifa_labels for a device name change. Make some effort to preserve
1100 * existing alias numbering and to create unique labels if possible.
1101*/
1102static void inetdev_changename(struct net_device *dev, struct in_device *in_dev)
1103{
1104 struct in_ifaddr *ifa;
1105 int named = 0;
1106
1107 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1108 char old[IFNAMSIZ], *dot;
1109
1110 memcpy(old, ifa->ifa_label, IFNAMSIZ);
1111 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1112 if (named++ == 0)
1113 goto skip;
1114 dot = strchr(old, ':');
1115 if (dot == NULL) {
1116 sprintf(old, ":%d", named);
1117 dot = old;
1118 }
1119 if (strlen(dot) + strlen(dev->name) < IFNAMSIZ)
1120 strcat(ifa->ifa_label, dot);
1121 else
1122 strcpy(ifa->ifa_label + (IFNAMSIZ - strlen(dot) - 1), dot);
1123skip:
1124 rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0);
1125 }
1126}
1127
1128static inline bool inetdev_valid_mtu(unsigned mtu)
1129{
1130 return mtu >= 68;
1131}
1132
1133static void inetdev_send_gratuitous_arp(struct net_device *dev,
1134 struct in_device *in_dev)
1135
1136{
1137 struct in_ifaddr *ifa;
1138
1139 for (ifa = in_dev->ifa_list; ifa;
1140 ifa = ifa->ifa_next) {
1141 arp_send(ARPOP_REQUEST, ETH_P_ARP,
1142 ifa->ifa_local, dev,
1143 ifa->ifa_local, NULL,
1144 dev->dev_addr, NULL);
1145 }
1146}
1147
1148/* Called only under RTNL semaphore */
1149
1150static int inetdev_event(struct notifier_block *this, unsigned long event,
1151 void *ptr)
1152{
1153 struct net_device *dev = ptr;
1154 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1155
1156 ASSERT_RTNL();
1157
1158 if (!in_dev) {
1159 if (event == NETDEV_REGISTER) {
1160 in_dev = inetdev_init(dev);
1161 if (!in_dev)
1162 return notifier_from_errno(-ENOMEM);
1163 if (dev->flags & IFF_LOOPBACK) {
1164 IN_DEV_CONF_SET(in_dev, NOXFRM, 1);
1165 IN_DEV_CONF_SET(in_dev, NOPOLICY, 1);
1166 }
1167 } else if (event == NETDEV_CHANGEMTU) {
1168 /* Re-enabling IP */
1169 if (inetdev_valid_mtu(dev->mtu))
1170 in_dev = inetdev_init(dev);
1171 }
1172 goto out;
1173 }
1174
1175 switch (event) {
1176 case NETDEV_REGISTER:
1177 printk(KERN_DEBUG "inetdev_event: bug\n");
1178 rcu_assign_pointer(dev->ip_ptr, NULL);
1179 break;
1180 case NETDEV_UP:
1181 if (!inetdev_valid_mtu(dev->mtu))
1182 break;
1183 if (dev->flags & IFF_LOOPBACK) {
1184 struct in_ifaddr *ifa = inet_alloc_ifa();
1185
1186 if (ifa) {
1187 INIT_HLIST_NODE(&ifa->hash);
1188 ifa->ifa_local =
1189 ifa->ifa_address = htonl(INADDR_LOOPBACK);
1190 ifa->ifa_prefixlen = 8;
1191 ifa->ifa_mask = inet_make_mask(8);
1192 in_dev_hold(in_dev);
1193 ifa->ifa_dev = in_dev;
1194 ifa->ifa_scope = RT_SCOPE_HOST;
1195 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1196 inet_insert_ifa(ifa);
1197 }
1198 }
1199 ip_mc_up(in_dev);
1200 /* fall through */
1201 case NETDEV_CHANGEADDR:
1202 if (!IN_DEV_ARP_NOTIFY(in_dev))
1203 break;
1204 /* fall through */
1205 case NETDEV_NOTIFY_PEERS:
1206 /* Send gratuitous ARP to notify of link change */
1207 inetdev_send_gratuitous_arp(dev, in_dev);
1208 break;
1209 case NETDEV_DOWN:
1210 ip_mc_down(in_dev);
1211 break;
1212 case NETDEV_PRE_TYPE_CHANGE:
1213 ip_mc_unmap(in_dev);
1214 break;
1215 case NETDEV_POST_TYPE_CHANGE:
1216 ip_mc_remap(in_dev);
1217 break;
1218 case NETDEV_CHANGEMTU:
1219 if (inetdev_valid_mtu(dev->mtu))
1220 break;
1221 /* disable IP when MTU is not enough */
1222 case NETDEV_UNREGISTER:
1223 inetdev_destroy(in_dev);
1224 break;
1225 case NETDEV_CHANGENAME:
1226 /* Do not notify about label change, this event is
1227 * not interesting to applications using netlink.
1228 */
1229 inetdev_changename(dev, in_dev);
1230
1231 devinet_sysctl_unregister(in_dev);
1232 devinet_sysctl_register(in_dev);
1233 break;
1234 }
1235out:
1236 return NOTIFY_DONE;
1237}
1238
1239static struct notifier_block ip_netdev_notifier = {
1240 .notifier_call = inetdev_event,
1241};
1242
1243static inline size_t inet_nlmsg_size(void)
1244{
1245 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
1246 + nla_total_size(4) /* IFA_ADDRESS */
1247 + nla_total_size(4) /* IFA_LOCAL */
1248 + nla_total_size(4) /* IFA_BROADCAST */
1249 + nla_total_size(IFNAMSIZ); /* IFA_LABEL */
1250}
1251
1252static int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa,
1253 u32 pid, u32 seq, int event, unsigned int flags)
1254{
1255 struct ifaddrmsg *ifm;
1256 struct nlmsghdr *nlh;
1257
1258 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*ifm), flags);
1259 if (nlh == NULL)
1260 return -EMSGSIZE;
1261
1262 ifm = nlmsg_data(nlh);
1263 ifm->ifa_family = AF_INET;
1264 ifm->ifa_prefixlen = ifa->ifa_prefixlen;
1265 ifm->ifa_flags = ifa->ifa_flags|IFA_F_PERMANENT;
1266 ifm->ifa_scope = ifa->ifa_scope;
1267 ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
1268
1269 if (ifa->ifa_address)
1270 NLA_PUT_BE32(skb, IFA_ADDRESS, ifa->ifa_address);
1271
1272 if (ifa->ifa_local)
1273 NLA_PUT_BE32(skb, IFA_LOCAL, ifa->ifa_local);
1274
1275 if (ifa->ifa_broadcast)
1276 NLA_PUT_BE32(skb, IFA_BROADCAST, ifa->ifa_broadcast);
1277
1278 if (ifa->ifa_label[0])
1279 NLA_PUT_STRING(skb, IFA_LABEL, ifa->ifa_label);
1280
1281 return nlmsg_end(skb, nlh);
1282
1283nla_put_failure:
1284 nlmsg_cancel(skb, nlh);
1285 return -EMSGSIZE;
1286}
1287
1288static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
1289{
1290 struct net *net = sock_net(skb->sk);
1291 int h, s_h;
1292 int idx, s_idx;
1293 int ip_idx, s_ip_idx;
1294 struct net_device *dev;
1295 struct in_device *in_dev;
1296 struct in_ifaddr *ifa;
1297 struct hlist_head *head;
1298 struct hlist_node *node;
1299
1300 s_h = cb->args[0];
1301 s_idx = idx = cb->args[1];
1302 s_ip_idx = ip_idx = cb->args[2];
1303
1304 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1305 idx = 0;
1306 head = &net->dev_index_head[h];
1307 rcu_read_lock();
1308 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
1309 if (idx < s_idx)
1310 goto cont;
1311 if (h > s_h || idx > s_idx)
1312 s_ip_idx = 0;
1313 in_dev = __in_dev_get_rcu(dev);
1314 if (!in_dev)
1315 goto cont;
1316
1317 for (ifa = in_dev->ifa_list, ip_idx = 0; ifa;
1318 ifa = ifa->ifa_next, ip_idx++) {
1319 if (ip_idx < s_ip_idx)
1320 continue;
1321 if (inet_fill_ifaddr(skb, ifa,
1322 NETLINK_CB(cb->skb).pid,
1323 cb->nlh->nlmsg_seq,
1324 RTM_NEWADDR, NLM_F_MULTI) <= 0) {
1325 rcu_read_unlock();
1326 goto done;
1327 }
1328 }
1329cont:
1330 idx++;
1331 }
1332 rcu_read_unlock();
1333 }
1334
1335done:
1336 cb->args[0] = h;
1337 cb->args[1] = idx;
1338 cb->args[2] = ip_idx;
1339
1340 return skb->len;
1341}
1342
1343static void rtmsg_ifa(int event, struct in_ifaddr *ifa, struct nlmsghdr *nlh,
1344 u32 pid)
1345{
1346 struct sk_buff *skb;
1347 u32 seq = nlh ? nlh->nlmsg_seq : 0;
1348 int err = -ENOBUFS;
1349 struct net *net;
1350
1351 net = dev_net(ifa->ifa_dev->dev);
1352 skb = nlmsg_new(inet_nlmsg_size(), GFP_KERNEL);
1353 if (skb == NULL)
1354 goto errout;
1355
1356 err = inet_fill_ifaddr(skb, ifa, pid, seq, event, 0);
1357 if (err < 0) {
1358 /* -EMSGSIZE implies BUG in inet_nlmsg_size() */
1359 WARN_ON(err == -EMSGSIZE);
1360 kfree_skb(skb);
1361 goto errout;
1362 }
1363 rtnl_notify(skb, net, pid, RTNLGRP_IPV4_IFADDR, nlh, GFP_KERNEL);
1364 return;
1365errout:
1366 if (err < 0)
1367 rtnl_set_sk_err(net, RTNLGRP_IPV4_IFADDR, err);
1368}
1369
1370static size_t inet_get_link_af_size(const struct net_device *dev)
1371{
1372 struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr);
1373
1374 if (!in_dev)
1375 return 0;
1376
1377 return nla_total_size(IPV4_DEVCONF_MAX * 4); /* IFLA_INET_CONF */
1378}
1379
1380static int inet_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
1381{
1382 struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr);
1383 struct nlattr *nla;
1384 int i;
1385
1386 if (!in_dev)
1387 return -ENODATA;
1388
1389 nla = nla_reserve(skb, IFLA_INET_CONF, IPV4_DEVCONF_MAX * 4);
1390 if (nla == NULL)
1391 return -EMSGSIZE;
1392
1393 for (i = 0; i < IPV4_DEVCONF_MAX; i++)
1394 ((u32 *) nla_data(nla))[i] = in_dev->cnf.data[i];
1395
1396 return 0;
1397}
1398
1399static const struct nla_policy inet_af_policy[IFLA_INET_MAX+1] = {
1400 [IFLA_INET_CONF] = { .type = NLA_NESTED },
1401};
1402
1403static int inet_validate_link_af(const struct net_device *dev,
1404 const struct nlattr *nla)
1405{
1406 struct nlattr *a, *tb[IFLA_INET_MAX+1];
1407 int err, rem;
1408
1409 if (dev && !__in_dev_get_rtnl(dev))
1410 return -EAFNOSUPPORT;
1411
1412 err = nla_parse_nested(tb, IFLA_INET_MAX, nla, inet_af_policy);
1413 if (err < 0)
1414 return err;
1415
1416 if (tb[IFLA_INET_CONF]) {
1417 nla_for_each_nested(a, tb[IFLA_INET_CONF], rem) {
1418 int cfgid = nla_type(a);
1419
1420 if (nla_len(a) < 4)
1421 return -EINVAL;
1422
1423 if (cfgid <= 0 || cfgid > IPV4_DEVCONF_MAX)
1424 return -EINVAL;
1425 }
1426 }
1427
1428 return 0;
1429}
1430
1431static int inet_set_link_af(struct net_device *dev, const struct nlattr *nla)
1432{
1433 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1434 struct nlattr *a, *tb[IFLA_INET_MAX+1];
1435 int rem;
1436
1437 if (!in_dev)
1438 return -EAFNOSUPPORT;
1439
1440 if (nla_parse_nested(tb, IFLA_INET_MAX, nla, NULL) < 0)
1441 BUG();
1442
1443 if (tb[IFLA_INET_CONF]) {
1444 nla_for_each_nested(a, tb[IFLA_INET_CONF], rem)
1445 ipv4_devconf_set(in_dev, nla_type(a), nla_get_u32(a));
1446 }
1447
1448 return 0;
1449}
1450
1451#ifdef CONFIG_SYSCTL
1452
1453static void devinet_copy_dflt_conf(struct net *net, int i)
1454{
1455 struct net_device *dev;
1456
1457 rcu_read_lock();
1458 for_each_netdev_rcu(net, dev) {
1459 struct in_device *in_dev;
1460
1461 in_dev = __in_dev_get_rcu(dev);
1462 if (in_dev && !test_bit(i, in_dev->cnf.state))
1463 in_dev->cnf.data[i] = net->ipv4.devconf_dflt->data[i];
1464 }
1465 rcu_read_unlock();
1466}
1467
1468/* called with RTNL locked */
1469static void inet_forward_change(struct net *net)
1470{
1471 struct net_device *dev;
1472 int on = IPV4_DEVCONF_ALL(net, FORWARDING);
1473
1474 IPV4_DEVCONF_ALL(net, ACCEPT_REDIRECTS) = !on;
1475 IPV4_DEVCONF_DFLT(net, FORWARDING) = on;
1476
1477 for_each_netdev(net, dev) {
1478 struct in_device *in_dev;
1479 if (on)
1480 dev_disable_lro(dev);
1481 rcu_read_lock();
1482 in_dev = __in_dev_get_rcu(dev);
1483 if (in_dev)
1484 IN_DEV_CONF_SET(in_dev, FORWARDING, on);
1485 rcu_read_unlock();
1486 }
1487}
1488
1489static int devinet_conf_proc(ctl_table *ctl, int write,
1490 void __user *buffer,
1491 size_t *lenp, loff_t *ppos)
1492{
1493 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
1494
1495 if (write) {
1496 struct ipv4_devconf *cnf = ctl->extra1;
1497 struct net *net = ctl->extra2;
1498 int i = (int *)ctl->data - cnf->data;
1499
1500 set_bit(i, cnf->state);
1501
1502 if (cnf == net->ipv4.devconf_dflt)
1503 devinet_copy_dflt_conf(net, i);
1504 }
1505
1506 return ret;
1507}
1508
1509static int devinet_sysctl_forward(ctl_table *ctl, int write,
1510 void __user *buffer,
1511 size_t *lenp, loff_t *ppos)
1512{
1513 int *valp = ctl->data;
1514 int val = *valp;
1515 loff_t pos = *ppos;
1516 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
1517
1518 if (write && *valp != val) {
1519 struct net *net = ctl->extra2;
1520
1521 if (valp != &IPV4_DEVCONF_DFLT(net, FORWARDING)) {
1522 if (!rtnl_trylock()) {
1523 /* Restore the original values before restarting */
1524 *valp = val;
1525 *ppos = pos;
1526 return restart_syscall();
1527 }
1528 if (valp == &IPV4_DEVCONF_ALL(net, FORWARDING)) {
1529 inet_forward_change(net);
1530 } else if (*valp) {
1531 struct ipv4_devconf *cnf = ctl->extra1;
1532 struct in_device *idev =
1533 container_of(cnf, struct in_device, cnf);
1534 dev_disable_lro(idev->dev);
1535 }
1536 rtnl_unlock();
1537 rt_cache_flush(net, 0);
1538 }
1539 }
1540
1541 return ret;
1542}
1543
1544static int ipv4_doint_and_flush(ctl_table *ctl, int write,
1545 void __user *buffer,
1546 size_t *lenp, loff_t *ppos)
1547{
1548 int *valp = ctl->data;
1549 int val = *valp;
1550 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
1551 struct net *net = ctl->extra2;
1552
1553 if (write && *valp != val)
1554 rt_cache_flush(net, 0);
1555
1556 return ret;
1557}
1558
1559#define DEVINET_SYSCTL_ENTRY(attr, name, mval, proc) \
1560 { \
1561 .procname = name, \
1562 .data = ipv4_devconf.data + \
1563 IPV4_DEVCONF_ ## attr - 1, \
1564 .maxlen = sizeof(int), \
1565 .mode = mval, \
1566 .proc_handler = proc, \
1567 .extra1 = &ipv4_devconf, \
1568 }
1569
1570#define DEVINET_SYSCTL_RW_ENTRY(attr, name) \
1571 DEVINET_SYSCTL_ENTRY(attr, name, 0644, devinet_conf_proc)
1572
1573#define DEVINET_SYSCTL_RO_ENTRY(attr, name) \
1574 DEVINET_SYSCTL_ENTRY(attr, name, 0444, devinet_conf_proc)
1575
1576#define DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, proc) \
1577 DEVINET_SYSCTL_ENTRY(attr, name, 0644, proc)
1578
1579#define DEVINET_SYSCTL_FLUSHING_ENTRY(attr, name) \
1580 DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, ipv4_doint_and_flush)
1581
1582static struct devinet_sysctl_table {
1583 struct ctl_table_header *sysctl_header;
1584 struct ctl_table devinet_vars[__IPV4_DEVCONF_MAX];
1585 char *dev_name;
1586} devinet_sysctl = {
1587 .devinet_vars = {
1588 DEVINET_SYSCTL_COMPLEX_ENTRY(FORWARDING, "forwarding",
1589 devinet_sysctl_forward),
1590 DEVINET_SYSCTL_RO_ENTRY(MC_FORWARDING, "mc_forwarding"),
1591
1592 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_REDIRECTS, "accept_redirects"),
1593 DEVINET_SYSCTL_RW_ENTRY(SECURE_REDIRECTS, "secure_redirects"),
1594 DEVINET_SYSCTL_RW_ENTRY(SHARED_MEDIA, "shared_media"),
1595 DEVINET_SYSCTL_RW_ENTRY(RP_FILTER, "rp_filter"),
1596 DEVINET_SYSCTL_RW_ENTRY(SEND_REDIRECTS, "send_redirects"),
1597 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_SOURCE_ROUTE,
1598 "accept_source_route"),
1599 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_LOCAL, "accept_local"),
1600 DEVINET_SYSCTL_RW_ENTRY(SRC_VMARK, "src_valid_mark"),
1601 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP, "proxy_arp"),
1602 DEVINET_SYSCTL_RW_ENTRY(MEDIUM_ID, "medium_id"),
1603 DEVINET_SYSCTL_RW_ENTRY(BOOTP_RELAY, "bootp_relay"),
1604 DEVINET_SYSCTL_RW_ENTRY(LOG_MARTIANS, "log_martians"),
1605 DEVINET_SYSCTL_RW_ENTRY(TAG, "tag"),
1606 DEVINET_SYSCTL_RW_ENTRY(ARPFILTER, "arp_filter"),
1607 DEVINET_SYSCTL_RW_ENTRY(ARP_ANNOUNCE, "arp_announce"),
1608 DEVINET_SYSCTL_RW_ENTRY(ARP_IGNORE, "arp_ignore"),
1609 DEVINET_SYSCTL_RW_ENTRY(ARP_ACCEPT, "arp_accept"),
1610 DEVINET_SYSCTL_RW_ENTRY(ARP_NOTIFY, "arp_notify"),
1611 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP_PVLAN, "proxy_arp_pvlan"),
1612
1613 DEVINET_SYSCTL_FLUSHING_ENTRY(NOXFRM, "disable_xfrm"),
1614 DEVINET_SYSCTL_FLUSHING_ENTRY(NOPOLICY, "disable_policy"),
1615 DEVINET_SYSCTL_FLUSHING_ENTRY(FORCE_IGMP_VERSION,
1616 "force_igmp_version"),
1617 DEVINET_SYSCTL_FLUSHING_ENTRY(PROMOTE_SECONDARIES,
1618 "promote_secondaries"),
1619 },
1620};
1621
1622static int __devinet_sysctl_register(struct net *net, char *dev_name,
1623 struct ipv4_devconf *p)
1624{
1625 int i;
1626 struct devinet_sysctl_table *t;
1627
1628#define DEVINET_CTL_PATH_DEV 3
1629
1630 struct ctl_path devinet_ctl_path[] = {
1631 { .procname = "net", },
1632 { .procname = "ipv4", },
1633 { .procname = "conf", },
1634 { /* to be set */ },
1635 { },
1636 };
1637
1638 t = kmemdup(&devinet_sysctl, sizeof(*t), GFP_KERNEL);
1639 if (!t)
1640 goto out;
1641
1642 for (i = 0; i < ARRAY_SIZE(t->devinet_vars) - 1; i++) {
1643 t->devinet_vars[i].data += (char *)p - (char *)&ipv4_devconf;
1644 t->devinet_vars[i].extra1 = p;
1645 t->devinet_vars[i].extra2 = net;
1646 }
1647
1648 /*
1649 * Make a copy of dev_name, because '.procname' is regarded as const
1650 * by sysctl and we wouldn't want anyone to change it under our feet
1651 * (see SIOCSIFNAME).
1652 */
1653 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
1654 if (!t->dev_name)
1655 goto free;
1656
1657 devinet_ctl_path[DEVINET_CTL_PATH_DEV].procname = t->dev_name;
1658
1659 t->sysctl_header = register_net_sysctl_table(net, devinet_ctl_path,
1660 t->devinet_vars);
1661 if (!t->sysctl_header)
1662 goto free_procname;
1663
1664 p->sysctl = t;
1665 return 0;
1666
1667free_procname:
1668 kfree(t->dev_name);
1669free:
1670 kfree(t);
1671out:
1672 return -ENOBUFS;
1673}
1674
1675static void __devinet_sysctl_unregister(struct ipv4_devconf *cnf)
1676{
1677 struct devinet_sysctl_table *t = cnf->sysctl;
1678
1679 if (t == NULL)
1680 return;
1681
1682 cnf->sysctl = NULL;
1683 unregister_net_sysctl_table(t->sysctl_header);
1684 kfree(t->dev_name);
1685 kfree(t);
1686}
1687
1688static void devinet_sysctl_register(struct in_device *idev)
1689{
1690 neigh_sysctl_register(idev->dev, idev->arp_parms, "ipv4", NULL);
1691 __devinet_sysctl_register(dev_net(idev->dev), idev->dev->name,
1692 &idev->cnf);
1693}
1694
1695static void devinet_sysctl_unregister(struct in_device *idev)
1696{
1697 __devinet_sysctl_unregister(&idev->cnf);
1698 neigh_sysctl_unregister(idev->arp_parms);
1699}
1700
1701static struct ctl_table ctl_forward_entry[] = {
1702 {
1703 .procname = "ip_forward",
1704 .data = &ipv4_devconf.data[
1705 IPV4_DEVCONF_FORWARDING - 1],
1706 .maxlen = sizeof(int),
1707 .mode = 0644,
1708 .proc_handler = devinet_sysctl_forward,
1709 .extra1 = &ipv4_devconf,
1710 .extra2 = &init_net,
1711 },
1712 { },
1713};
1714
1715static __net_initdata struct ctl_path net_ipv4_path[] = {
1716 { .procname = "net", },
1717 { .procname = "ipv4", },
1718 { },
1719};
1720#endif
1721
1722static __net_init int devinet_init_net(struct net *net)
1723{
1724 int err;
1725 struct ipv4_devconf *all, *dflt;
1726#ifdef CONFIG_SYSCTL
1727 struct ctl_table *tbl = ctl_forward_entry;
1728 struct ctl_table_header *forw_hdr;
1729#endif
1730
1731 err = -ENOMEM;
1732 all = &ipv4_devconf;
1733 dflt = &ipv4_devconf_dflt;
1734
1735 if (!net_eq(net, &init_net)) {
1736 all = kmemdup(all, sizeof(ipv4_devconf), GFP_KERNEL);
1737 if (all == NULL)
1738 goto err_alloc_all;
1739
1740 dflt = kmemdup(dflt, sizeof(ipv4_devconf_dflt), GFP_KERNEL);
1741 if (dflt == NULL)
1742 goto err_alloc_dflt;
1743
1744#ifdef CONFIG_SYSCTL
1745 tbl = kmemdup(tbl, sizeof(ctl_forward_entry), GFP_KERNEL);
1746 if (tbl == NULL)
1747 goto err_alloc_ctl;
1748
1749 tbl[0].data = &all->data[IPV4_DEVCONF_FORWARDING - 1];
1750 tbl[0].extra1 = all;
1751 tbl[0].extra2 = net;
1752#endif
1753 }
1754
1755#ifdef CONFIG_SYSCTL
1756 err = __devinet_sysctl_register(net, "all", all);
1757 if (err < 0)
1758 goto err_reg_all;
1759
1760 err = __devinet_sysctl_register(net, "default", dflt);
1761 if (err < 0)
1762 goto err_reg_dflt;
1763
1764 err = -ENOMEM;
1765 forw_hdr = register_net_sysctl_table(net, net_ipv4_path, tbl);
1766 if (forw_hdr == NULL)
1767 goto err_reg_ctl;
1768 net->ipv4.forw_hdr = forw_hdr;
1769#endif
1770
1771 net->ipv4.devconf_all = all;
1772 net->ipv4.devconf_dflt = dflt;
1773 return 0;
1774
1775#ifdef CONFIG_SYSCTL
1776err_reg_ctl:
1777 __devinet_sysctl_unregister(dflt);
1778err_reg_dflt:
1779 __devinet_sysctl_unregister(all);
1780err_reg_all:
1781 if (tbl != ctl_forward_entry)
1782 kfree(tbl);
1783err_alloc_ctl:
1784#endif
1785 if (dflt != &ipv4_devconf_dflt)
1786 kfree(dflt);
1787err_alloc_dflt:
1788 if (all != &ipv4_devconf)
1789 kfree(all);
1790err_alloc_all:
1791 return err;
1792}
1793
1794static __net_exit void devinet_exit_net(struct net *net)
1795{
1796#ifdef CONFIG_SYSCTL
1797 struct ctl_table *tbl;
1798
1799 tbl = net->ipv4.forw_hdr->ctl_table_arg;
1800 unregister_net_sysctl_table(net->ipv4.forw_hdr);
1801 __devinet_sysctl_unregister(net->ipv4.devconf_dflt);
1802 __devinet_sysctl_unregister(net->ipv4.devconf_all);
1803 kfree(tbl);
1804#endif
1805 kfree(net->ipv4.devconf_dflt);
1806 kfree(net->ipv4.devconf_all);
1807}
1808
1809static __net_initdata struct pernet_operations devinet_ops = {
1810 .init = devinet_init_net,
1811 .exit = devinet_exit_net,
1812};
1813
1814static struct rtnl_af_ops inet_af_ops = {
1815 .family = AF_INET,
1816 .fill_link_af = inet_fill_link_af,
1817 .get_link_af_size = inet_get_link_af_size,
1818 .validate_link_af = inet_validate_link_af,
1819 .set_link_af = inet_set_link_af,
1820};
1821
1822void __init devinet_init(void)
1823{
1824 int i;
1825
1826 for (i = 0; i < IN4_ADDR_HSIZE; i++)
1827 INIT_HLIST_HEAD(&inet_addr_lst[i]);
1828
1829 register_pernet_subsys(&devinet_ops);
1830
1831 register_gifconf(PF_INET, inet_gifconf);
1832 register_netdevice_notifier(&ip_netdev_notifier);
1833
1834 rtnl_af_register(&inet_af_ops);
1835
1836 rtnl_register(PF_INET, RTM_NEWADDR, inet_rtm_newaddr, NULL, NULL);
1837 rtnl_register(PF_INET, RTM_DELADDR, inet_rtm_deladdr, NULL, NULL);
1838 rtnl_register(PF_INET, RTM_GETADDR, NULL, inet_dump_ifaddr, NULL);
1839}
1840
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 <linux/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/sched/signal.h>
36#include <linux/string.h>
37#include <linux/mm.h>
38#include <linux/socket.h>
39#include <linux/sockios.h>
40#include <linux/in.h>
41#include <linux/errno.h>
42#include <linux/interrupt.h>
43#include <linux/if_addr.h>
44#include <linux/if_ether.h>
45#include <linux/inet.h>
46#include <linux/netdevice.h>
47#include <linux/etherdevice.h>
48#include <linux/skbuff.h>
49#include <linux/init.h>
50#include <linux/notifier.h>
51#include <linux/inetdevice.h>
52#include <linux/igmp.h>
53#include <linux/slab.h>
54#include <linux/hash.h>
55#ifdef CONFIG_SYSCTL
56#include <linux/sysctl.h>
57#endif
58#include <linux/kmod.h>
59#include <linux/netconf.h>
60
61#include <net/arp.h>
62#include <net/ip.h>
63#include <net/route.h>
64#include <net/ip_fib.h>
65#include <net/rtnetlink.h>
66#include <net/net_namespace.h>
67#include <net/addrconf.h>
68
69static struct ipv4_devconf ipv4_devconf = {
70 .data = {
71 [IPV4_DEVCONF_ACCEPT_REDIRECTS - 1] = 1,
72 [IPV4_DEVCONF_SEND_REDIRECTS - 1] = 1,
73 [IPV4_DEVCONF_SECURE_REDIRECTS - 1] = 1,
74 [IPV4_DEVCONF_SHARED_MEDIA - 1] = 1,
75 [IPV4_DEVCONF_IGMPV2_UNSOLICITED_REPORT_INTERVAL - 1] = 10000 /*ms*/,
76 [IPV4_DEVCONF_IGMPV3_UNSOLICITED_REPORT_INTERVAL - 1] = 1000 /*ms*/,
77 },
78};
79
80static struct ipv4_devconf ipv4_devconf_dflt = {
81 .data = {
82 [IPV4_DEVCONF_ACCEPT_REDIRECTS - 1] = 1,
83 [IPV4_DEVCONF_SEND_REDIRECTS - 1] = 1,
84 [IPV4_DEVCONF_SECURE_REDIRECTS - 1] = 1,
85 [IPV4_DEVCONF_SHARED_MEDIA - 1] = 1,
86 [IPV4_DEVCONF_ACCEPT_SOURCE_ROUTE - 1] = 1,
87 [IPV4_DEVCONF_IGMPV2_UNSOLICITED_REPORT_INTERVAL - 1] = 10000 /*ms*/,
88 [IPV4_DEVCONF_IGMPV3_UNSOLICITED_REPORT_INTERVAL - 1] = 1000 /*ms*/,
89 },
90};
91
92#define IPV4_DEVCONF_DFLT(net, attr) \
93 IPV4_DEVCONF((*net->ipv4.devconf_dflt), attr)
94
95static const struct nla_policy ifa_ipv4_policy[IFA_MAX+1] = {
96 [IFA_LOCAL] = { .type = NLA_U32 },
97 [IFA_ADDRESS] = { .type = NLA_U32 },
98 [IFA_BROADCAST] = { .type = NLA_U32 },
99 [IFA_LABEL] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 },
100 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
101 [IFA_FLAGS] = { .type = NLA_U32 },
102};
103
104#define IN4_ADDR_HSIZE_SHIFT 8
105#define IN4_ADDR_HSIZE (1U << IN4_ADDR_HSIZE_SHIFT)
106
107static struct hlist_head inet_addr_lst[IN4_ADDR_HSIZE];
108
109static u32 inet_addr_hash(const struct net *net, __be32 addr)
110{
111 u32 val = (__force u32) addr ^ net_hash_mix(net);
112
113 return hash_32(val, IN4_ADDR_HSIZE_SHIFT);
114}
115
116static void inet_hash_insert(struct net *net, struct in_ifaddr *ifa)
117{
118 u32 hash = inet_addr_hash(net, ifa->ifa_local);
119
120 ASSERT_RTNL();
121 hlist_add_head_rcu(&ifa->hash, &inet_addr_lst[hash]);
122}
123
124static void inet_hash_remove(struct in_ifaddr *ifa)
125{
126 ASSERT_RTNL();
127 hlist_del_init_rcu(&ifa->hash);
128}
129
130/**
131 * __ip_dev_find - find the first device with a given source address.
132 * @net: the net namespace
133 * @addr: the source address
134 * @devref: if true, take a reference on the found device
135 *
136 * If a caller uses devref=false, it should be protected by RCU, or RTNL
137 */
138struct net_device *__ip_dev_find(struct net *net, __be32 addr, bool devref)
139{
140 struct net_device *result = NULL;
141 struct in_ifaddr *ifa;
142
143 rcu_read_lock();
144 ifa = inet_lookup_ifaddr_rcu(net, addr);
145 if (!ifa) {
146 struct flowi4 fl4 = { .daddr = addr };
147 struct fib_result res = { 0 };
148 struct fib_table *local;
149
150 /* Fallback to FIB local table so that communication
151 * over loopback subnets work.
152 */
153 local = fib_get_table(net, RT_TABLE_LOCAL);
154 if (local &&
155 !fib_table_lookup(local, &fl4, &res, FIB_LOOKUP_NOREF) &&
156 res.type == RTN_LOCAL)
157 result = FIB_RES_DEV(res);
158 } else {
159 result = ifa->ifa_dev->dev;
160 }
161 if (result && devref)
162 dev_hold(result);
163 rcu_read_unlock();
164 return result;
165}
166EXPORT_SYMBOL(__ip_dev_find);
167
168/* called under RCU lock */
169struct in_ifaddr *inet_lookup_ifaddr_rcu(struct net *net, __be32 addr)
170{
171 u32 hash = inet_addr_hash(net, addr);
172 struct in_ifaddr *ifa;
173
174 hlist_for_each_entry_rcu(ifa, &inet_addr_lst[hash], hash)
175 if (ifa->ifa_local == addr &&
176 net_eq(dev_net(ifa->ifa_dev->dev), net))
177 return ifa;
178
179 return NULL;
180}
181
182static void rtmsg_ifa(int event, struct in_ifaddr *, struct nlmsghdr *, u32);
183
184static BLOCKING_NOTIFIER_HEAD(inetaddr_chain);
185static BLOCKING_NOTIFIER_HEAD(inetaddr_validator_chain);
186static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
187 int destroy);
188#ifdef CONFIG_SYSCTL
189static int devinet_sysctl_register(struct in_device *idev);
190static void devinet_sysctl_unregister(struct in_device *idev);
191#else
192static int devinet_sysctl_register(struct in_device *idev)
193{
194 return 0;
195}
196static void devinet_sysctl_unregister(struct in_device *idev)
197{
198}
199#endif
200
201/* Locks all the inet devices. */
202
203static struct in_ifaddr *inet_alloc_ifa(void)
204{
205 return kzalloc(sizeof(struct in_ifaddr), GFP_KERNEL);
206}
207
208static void inet_rcu_free_ifa(struct rcu_head *head)
209{
210 struct in_ifaddr *ifa = container_of(head, struct in_ifaddr, rcu_head);
211 if (ifa->ifa_dev)
212 in_dev_put(ifa->ifa_dev);
213 kfree(ifa);
214}
215
216static void inet_free_ifa(struct in_ifaddr *ifa)
217{
218 call_rcu(&ifa->rcu_head, inet_rcu_free_ifa);
219}
220
221void in_dev_finish_destroy(struct in_device *idev)
222{
223 struct net_device *dev = idev->dev;
224
225 WARN_ON(idev->ifa_list);
226 WARN_ON(idev->mc_list);
227 kfree(rcu_dereference_protected(idev->mc_hash, 1));
228#ifdef NET_REFCNT_DEBUG
229 pr_debug("%s: %p=%s\n", __func__, idev, dev ? dev->name : "NIL");
230#endif
231 dev_put(dev);
232 if (!idev->dead)
233 pr_err("Freeing alive in_device %p\n", idev);
234 else
235 kfree(idev);
236}
237EXPORT_SYMBOL(in_dev_finish_destroy);
238
239static struct in_device *inetdev_init(struct net_device *dev)
240{
241 struct in_device *in_dev;
242 int err = -ENOMEM;
243
244 ASSERT_RTNL();
245
246 in_dev = kzalloc(sizeof(*in_dev), GFP_KERNEL);
247 if (!in_dev)
248 goto out;
249 memcpy(&in_dev->cnf, dev_net(dev)->ipv4.devconf_dflt,
250 sizeof(in_dev->cnf));
251 in_dev->cnf.sysctl = NULL;
252 in_dev->dev = dev;
253 in_dev->arp_parms = neigh_parms_alloc(dev, &arp_tbl);
254 if (!in_dev->arp_parms)
255 goto out_kfree;
256 if (IPV4_DEVCONF(in_dev->cnf, FORWARDING))
257 dev_disable_lro(dev);
258 /* Reference in_dev->dev */
259 dev_hold(dev);
260 /* Account for reference dev->ip_ptr (below) */
261 refcount_set(&in_dev->refcnt, 1);
262
263 err = devinet_sysctl_register(in_dev);
264 if (err) {
265 in_dev->dead = 1;
266 in_dev_put(in_dev);
267 in_dev = NULL;
268 goto out;
269 }
270 ip_mc_init_dev(in_dev);
271 if (dev->flags & IFF_UP)
272 ip_mc_up(in_dev);
273
274 /* we can receive as soon as ip_ptr is set -- do this last */
275 rcu_assign_pointer(dev->ip_ptr, in_dev);
276out:
277 return in_dev ?: ERR_PTR(err);
278out_kfree:
279 kfree(in_dev);
280 in_dev = NULL;
281 goto out;
282}
283
284static void in_dev_rcu_put(struct rcu_head *head)
285{
286 struct in_device *idev = container_of(head, struct in_device, rcu_head);
287 in_dev_put(idev);
288}
289
290static void inetdev_destroy(struct in_device *in_dev)
291{
292 struct in_ifaddr *ifa;
293 struct net_device *dev;
294
295 ASSERT_RTNL();
296
297 dev = in_dev->dev;
298
299 in_dev->dead = 1;
300
301 ip_mc_destroy_dev(in_dev);
302
303 while ((ifa = in_dev->ifa_list) != NULL) {
304 inet_del_ifa(in_dev, &in_dev->ifa_list, 0);
305 inet_free_ifa(ifa);
306 }
307
308 RCU_INIT_POINTER(dev->ip_ptr, NULL);
309
310 devinet_sysctl_unregister(in_dev);
311 neigh_parms_release(&arp_tbl, in_dev->arp_parms);
312 arp_ifdown(dev);
313
314 call_rcu(&in_dev->rcu_head, in_dev_rcu_put);
315}
316
317int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b)
318{
319 rcu_read_lock();
320 for_primary_ifa(in_dev) {
321 if (inet_ifa_match(a, ifa)) {
322 if (!b || inet_ifa_match(b, ifa)) {
323 rcu_read_unlock();
324 return 1;
325 }
326 }
327 } endfor_ifa(in_dev);
328 rcu_read_unlock();
329 return 0;
330}
331
332static void __inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
333 int destroy, struct nlmsghdr *nlh, u32 portid)
334{
335 struct in_ifaddr *promote = NULL;
336 struct in_ifaddr *ifa, *ifa1 = *ifap;
337 struct in_ifaddr *last_prim = in_dev->ifa_list;
338 struct in_ifaddr *prev_prom = NULL;
339 int do_promote = IN_DEV_PROMOTE_SECONDARIES(in_dev);
340
341 ASSERT_RTNL();
342
343 if (in_dev->dead)
344 goto no_promotions;
345
346 /* 1. Deleting primary ifaddr forces deletion all secondaries
347 * unless alias promotion is set
348 **/
349
350 if (!(ifa1->ifa_flags & IFA_F_SECONDARY)) {
351 struct in_ifaddr **ifap1 = &ifa1->ifa_next;
352
353 while ((ifa = *ifap1) != NULL) {
354 if (!(ifa->ifa_flags & IFA_F_SECONDARY) &&
355 ifa1->ifa_scope <= ifa->ifa_scope)
356 last_prim = ifa;
357
358 if (!(ifa->ifa_flags & IFA_F_SECONDARY) ||
359 ifa1->ifa_mask != ifa->ifa_mask ||
360 !inet_ifa_match(ifa1->ifa_address, ifa)) {
361 ifap1 = &ifa->ifa_next;
362 prev_prom = ifa;
363 continue;
364 }
365
366 if (!do_promote) {
367 inet_hash_remove(ifa);
368 *ifap1 = ifa->ifa_next;
369
370 rtmsg_ifa(RTM_DELADDR, ifa, nlh, portid);
371 blocking_notifier_call_chain(&inetaddr_chain,
372 NETDEV_DOWN, ifa);
373 inet_free_ifa(ifa);
374 } else {
375 promote = ifa;
376 break;
377 }
378 }
379 }
380
381 /* On promotion all secondaries from subnet are changing
382 * the primary IP, we must remove all their routes silently
383 * and later to add them back with new prefsrc. Do this
384 * while all addresses are on the device list.
385 */
386 for (ifa = promote; ifa; ifa = ifa->ifa_next) {
387 if (ifa1->ifa_mask == ifa->ifa_mask &&
388 inet_ifa_match(ifa1->ifa_address, ifa))
389 fib_del_ifaddr(ifa, ifa1);
390 }
391
392no_promotions:
393 /* 2. Unlink it */
394
395 *ifap = ifa1->ifa_next;
396 inet_hash_remove(ifa1);
397
398 /* 3. Announce address deletion */
399
400 /* Send message first, then call notifier.
401 At first sight, FIB update triggered by notifier
402 will refer to already deleted ifaddr, that could confuse
403 netlink listeners. It is not true: look, gated sees
404 that route deleted and if it still thinks that ifaddr
405 is valid, it will try to restore deleted routes... Grr.
406 So that, this order is correct.
407 */
408 rtmsg_ifa(RTM_DELADDR, ifa1, nlh, portid);
409 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa1);
410
411 if (promote) {
412 struct in_ifaddr *next_sec = promote->ifa_next;
413
414 if (prev_prom) {
415 prev_prom->ifa_next = promote->ifa_next;
416 promote->ifa_next = last_prim->ifa_next;
417 last_prim->ifa_next = promote;
418 }
419
420 promote->ifa_flags &= ~IFA_F_SECONDARY;
421 rtmsg_ifa(RTM_NEWADDR, promote, nlh, portid);
422 blocking_notifier_call_chain(&inetaddr_chain,
423 NETDEV_UP, promote);
424 for (ifa = next_sec; ifa; ifa = ifa->ifa_next) {
425 if (ifa1->ifa_mask != ifa->ifa_mask ||
426 !inet_ifa_match(ifa1->ifa_address, ifa))
427 continue;
428 fib_add_ifaddr(ifa);
429 }
430
431 }
432 if (destroy)
433 inet_free_ifa(ifa1);
434}
435
436static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
437 int destroy)
438{
439 __inet_del_ifa(in_dev, ifap, destroy, NULL, 0);
440}
441
442static void check_lifetime(struct work_struct *work);
443
444static DECLARE_DELAYED_WORK(check_lifetime_work, check_lifetime);
445
446static int __inet_insert_ifa(struct in_ifaddr *ifa, struct nlmsghdr *nlh,
447 u32 portid, struct netlink_ext_ack *extack)
448{
449 struct in_device *in_dev = ifa->ifa_dev;
450 struct in_ifaddr *ifa1, **ifap, **last_primary;
451 struct in_validator_info ivi;
452 int ret;
453
454 ASSERT_RTNL();
455
456 if (!ifa->ifa_local) {
457 inet_free_ifa(ifa);
458 return 0;
459 }
460
461 ifa->ifa_flags &= ~IFA_F_SECONDARY;
462 last_primary = &in_dev->ifa_list;
463
464 for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL;
465 ifap = &ifa1->ifa_next) {
466 if (!(ifa1->ifa_flags & IFA_F_SECONDARY) &&
467 ifa->ifa_scope <= ifa1->ifa_scope)
468 last_primary = &ifa1->ifa_next;
469 if (ifa1->ifa_mask == ifa->ifa_mask &&
470 inet_ifa_match(ifa1->ifa_address, ifa)) {
471 if (ifa1->ifa_local == ifa->ifa_local) {
472 inet_free_ifa(ifa);
473 return -EEXIST;
474 }
475 if (ifa1->ifa_scope != ifa->ifa_scope) {
476 inet_free_ifa(ifa);
477 return -EINVAL;
478 }
479 ifa->ifa_flags |= IFA_F_SECONDARY;
480 }
481 }
482
483 /* Allow any devices that wish to register ifaddr validtors to weigh
484 * in now, before changes are committed. The rntl lock is serializing
485 * access here, so the state should not change between a validator call
486 * and a final notify on commit. This isn't invoked on promotion under
487 * the assumption that validators are checking the address itself, and
488 * not the flags.
489 */
490 ivi.ivi_addr = ifa->ifa_address;
491 ivi.ivi_dev = ifa->ifa_dev;
492 ivi.extack = extack;
493 ret = blocking_notifier_call_chain(&inetaddr_validator_chain,
494 NETDEV_UP, &ivi);
495 ret = notifier_to_errno(ret);
496 if (ret) {
497 inet_free_ifa(ifa);
498 return ret;
499 }
500
501 if (!(ifa->ifa_flags & IFA_F_SECONDARY)) {
502 prandom_seed((__force u32) ifa->ifa_local);
503 ifap = last_primary;
504 }
505
506 ifa->ifa_next = *ifap;
507 *ifap = ifa;
508
509 inet_hash_insert(dev_net(in_dev->dev), ifa);
510
511 cancel_delayed_work(&check_lifetime_work);
512 queue_delayed_work(system_power_efficient_wq, &check_lifetime_work, 0);
513
514 /* Send message first, then call notifier.
515 Notifier will trigger FIB update, so that
516 listeners of netlink will know about new ifaddr */
517 rtmsg_ifa(RTM_NEWADDR, ifa, nlh, portid);
518 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa);
519
520 return 0;
521}
522
523static int inet_insert_ifa(struct in_ifaddr *ifa)
524{
525 return __inet_insert_ifa(ifa, NULL, 0, NULL);
526}
527
528static int inet_set_ifa(struct net_device *dev, struct in_ifaddr *ifa)
529{
530 struct in_device *in_dev = __in_dev_get_rtnl(dev);
531
532 ASSERT_RTNL();
533
534 if (!in_dev) {
535 inet_free_ifa(ifa);
536 return -ENOBUFS;
537 }
538 ipv4_devconf_setall(in_dev);
539 neigh_parms_data_state_setall(in_dev->arp_parms);
540 if (ifa->ifa_dev != in_dev) {
541 WARN_ON(ifa->ifa_dev);
542 in_dev_hold(in_dev);
543 ifa->ifa_dev = in_dev;
544 }
545 if (ipv4_is_loopback(ifa->ifa_local))
546 ifa->ifa_scope = RT_SCOPE_HOST;
547 return inet_insert_ifa(ifa);
548}
549
550/* Caller must hold RCU or RTNL :
551 * We dont take a reference on found in_device
552 */
553struct in_device *inetdev_by_index(struct net *net, int ifindex)
554{
555 struct net_device *dev;
556 struct in_device *in_dev = NULL;
557
558 rcu_read_lock();
559 dev = dev_get_by_index_rcu(net, ifindex);
560 if (dev)
561 in_dev = rcu_dereference_rtnl(dev->ip_ptr);
562 rcu_read_unlock();
563 return in_dev;
564}
565EXPORT_SYMBOL(inetdev_by_index);
566
567/* Called only from RTNL semaphored context. No locks. */
568
569struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix,
570 __be32 mask)
571{
572 ASSERT_RTNL();
573
574 for_primary_ifa(in_dev) {
575 if (ifa->ifa_mask == mask && inet_ifa_match(prefix, ifa))
576 return ifa;
577 } endfor_ifa(in_dev);
578 return NULL;
579}
580
581static int ip_mc_config(struct sock *sk, bool join, const struct in_ifaddr *ifa)
582{
583 struct ip_mreqn mreq = {
584 .imr_multiaddr.s_addr = ifa->ifa_address,
585 .imr_ifindex = ifa->ifa_dev->dev->ifindex,
586 };
587 int ret;
588
589 ASSERT_RTNL();
590
591 lock_sock(sk);
592 if (join)
593 ret = ip_mc_join_group(sk, &mreq);
594 else
595 ret = ip_mc_leave_group(sk, &mreq);
596 release_sock(sk);
597
598 return ret;
599}
600
601static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
602 struct netlink_ext_ack *extack)
603{
604 struct net *net = sock_net(skb->sk);
605 struct nlattr *tb[IFA_MAX+1];
606 struct in_device *in_dev;
607 struct ifaddrmsg *ifm;
608 struct in_ifaddr *ifa, **ifap;
609 int err = -EINVAL;
610
611 ASSERT_RTNL();
612
613 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy,
614 extack);
615 if (err < 0)
616 goto errout;
617
618 ifm = nlmsg_data(nlh);
619 in_dev = inetdev_by_index(net, ifm->ifa_index);
620 if (!in_dev) {
621 err = -ENODEV;
622 goto errout;
623 }
624
625 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
626 ifap = &ifa->ifa_next) {
627 if (tb[IFA_LOCAL] &&
628 ifa->ifa_local != nla_get_in_addr(tb[IFA_LOCAL]))
629 continue;
630
631 if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label))
632 continue;
633
634 if (tb[IFA_ADDRESS] &&
635 (ifm->ifa_prefixlen != ifa->ifa_prefixlen ||
636 !inet_ifa_match(nla_get_in_addr(tb[IFA_ADDRESS]), ifa)))
637 continue;
638
639 if (ipv4_is_multicast(ifa->ifa_address))
640 ip_mc_config(net->ipv4.mc_autojoin_sk, false, ifa);
641 __inet_del_ifa(in_dev, ifap, 1, nlh, NETLINK_CB(skb).portid);
642 return 0;
643 }
644
645 err = -EADDRNOTAVAIL;
646errout:
647 return err;
648}
649
650#define INFINITY_LIFE_TIME 0xFFFFFFFF
651
652static void check_lifetime(struct work_struct *work)
653{
654 unsigned long now, next, next_sec, next_sched;
655 struct in_ifaddr *ifa;
656 struct hlist_node *n;
657 int i;
658
659 now = jiffies;
660 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
661
662 for (i = 0; i < IN4_ADDR_HSIZE; i++) {
663 bool change_needed = false;
664
665 rcu_read_lock();
666 hlist_for_each_entry_rcu(ifa, &inet_addr_lst[i], hash) {
667 unsigned long age;
668
669 if (ifa->ifa_flags & IFA_F_PERMANENT)
670 continue;
671
672 /* We try to batch several events at once. */
673 age = (now - ifa->ifa_tstamp +
674 ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
675
676 if (ifa->ifa_valid_lft != INFINITY_LIFE_TIME &&
677 age >= ifa->ifa_valid_lft) {
678 change_needed = true;
679 } else if (ifa->ifa_preferred_lft ==
680 INFINITY_LIFE_TIME) {
681 continue;
682 } else if (age >= ifa->ifa_preferred_lft) {
683 if (time_before(ifa->ifa_tstamp +
684 ifa->ifa_valid_lft * HZ, next))
685 next = ifa->ifa_tstamp +
686 ifa->ifa_valid_lft * HZ;
687
688 if (!(ifa->ifa_flags & IFA_F_DEPRECATED))
689 change_needed = true;
690 } else if (time_before(ifa->ifa_tstamp +
691 ifa->ifa_preferred_lft * HZ,
692 next)) {
693 next = ifa->ifa_tstamp +
694 ifa->ifa_preferred_lft * HZ;
695 }
696 }
697 rcu_read_unlock();
698 if (!change_needed)
699 continue;
700 rtnl_lock();
701 hlist_for_each_entry_safe(ifa, n, &inet_addr_lst[i], hash) {
702 unsigned long age;
703
704 if (ifa->ifa_flags & IFA_F_PERMANENT)
705 continue;
706
707 /* We try to batch several events at once. */
708 age = (now - ifa->ifa_tstamp +
709 ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
710
711 if (ifa->ifa_valid_lft != INFINITY_LIFE_TIME &&
712 age >= ifa->ifa_valid_lft) {
713 struct in_ifaddr **ifap;
714
715 for (ifap = &ifa->ifa_dev->ifa_list;
716 *ifap != NULL; ifap = &(*ifap)->ifa_next) {
717 if (*ifap == ifa) {
718 inet_del_ifa(ifa->ifa_dev,
719 ifap, 1);
720 break;
721 }
722 }
723 } else if (ifa->ifa_preferred_lft !=
724 INFINITY_LIFE_TIME &&
725 age >= ifa->ifa_preferred_lft &&
726 !(ifa->ifa_flags & IFA_F_DEPRECATED)) {
727 ifa->ifa_flags |= IFA_F_DEPRECATED;
728 rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0);
729 }
730 }
731 rtnl_unlock();
732 }
733
734 next_sec = round_jiffies_up(next);
735 next_sched = next;
736
737 /* If rounded timeout is accurate enough, accept it. */
738 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
739 next_sched = next_sec;
740
741 now = jiffies;
742 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
743 if (time_before(next_sched, now + ADDRCONF_TIMER_FUZZ_MAX))
744 next_sched = now + ADDRCONF_TIMER_FUZZ_MAX;
745
746 queue_delayed_work(system_power_efficient_wq, &check_lifetime_work,
747 next_sched - now);
748}
749
750static void set_ifa_lifetime(struct in_ifaddr *ifa, __u32 valid_lft,
751 __u32 prefered_lft)
752{
753 unsigned long timeout;
754
755 ifa->ifa_flags &= ~(IFA_F_PERMANENT | IFA_F_DEPRECATED);
756
757 timeout = addrconf_timeout_fixup(valid_lft, HZ);
758 if (addrconf_finite_timeout(timeout))
759 ifa->ifa_valid_lft = timeout;
760 else
761 ifa->ifa_flags |= IFA_F_PERMANENT;
762
763 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
764 if (addrconf_finite_timeout(timeout)) {
765 if (timeout == 0)
766 ifa->ifa_flags |= IFA_F_DEPRECATED;
767 ifa->ifa_preferred_lft = timeout;
768 }
769 ifa->ifa_tstamp = jiffies;
770 if (!ifa->ifa_cstamp)
771 ifa->ifa_cstamp = ifa->ifa_tstamp;
772}
773
774static struct in_ifaddr *rtm_to_ifaddr(struct net *net, struct nlmsghdr *nlh,
775 __u32 *pvalid_lft, __u32 *pprefered_lft)
776{
777 struct nlattr *tb[IFA_MAX+1];
778 struct in_ifaddr *ifa;
779 struct ifaddrmsg *ifm;
780 struct net_device *dev;
781 struct in_device *in_dev;
782 int err;
783
784 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy,
785 NULL);
786 if (err < 0)
787 goto errout;
788
789 ifm = nlmsg_data(nlh);
790 err = -EINVAL;
791 if (ifm->ifa_prefixlen > 32 || !tb[IFA_LOCAL])
792 goto errout;
793
794 dev = __dev_get_by_index(net, ifm->ifa_index);
795 err = -ENODEV;
796 if (!dev)
797 goto errout;
798
799 in_dev = __in_dev_get_rtnl(dev);
800 err = -ENOBUFS;
801 if (!in_dev)
802 goto errout;
803
804 ifa = inet_alloc_ifa();
805 if (!ifa)
806 /*
807 * A potential indev allocation can be left alive, it stays
808 * assigned to its device and is destroy with it.
809 */
810 goto errout;
811
812 ipv4_devconf_setall(in_dev);
813 neigh_parms_data_state_setall(in_dev->arp_parms);
814 in_dev_hold(in_dev);
815
816 if (!tb[IFA_ADDRESS])
817 tb[IFA_ADDRESS] = tb[IFA_LOCAL];
818
819 INIT_HLIST_NODE(&ifa->hash);
820 ifa->ifa_prefixlen = ifm->ifa_prefixlen;
821 ifa->ifa_mask = inet_make_mask(ifm->ifa_prefixlen);
822 ifa->ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) :
823 ifm->ifa_flags;
824 ifa->ifa_scope = ifm->ifa_scope;
825 ifa->ifa_dev = in_dev;
826
827 ifa->ifa_local = nla_get_in_addr(tb[IFA_LOCAL]);
828 ifa->ifa_address = nla_get_in_addr(tb[IFA_ADDRESS]);
829
830 if (tb[IFA_BROADCAST])
831 ifa->ifa_broadcast = nla_get_in_addr(tb[IFA_BROADCAST]);
832
833 if (tb[IFA_LABEL])
834 nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ);
835 else
836 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
837
838 if (tb[IFA_CACHEINFO]) {
839 struct ifa_cacheinfo *ci;
840
841 ci = nla_data(tb[IFA_CACHEINFO]);
842 if (!ci->ifa_valid || ci->ifa_prefered > ci->ifa_valid) {
843 err = -EINVAL;
844 goto errout_free;
845 }
846 *pvalid_lft = ci->ifa_valid;
847 *pprefered_lft = ci->ifa_prefered;
848 }
849
850 return ifa;
851
852errout_free:
853 inet_free_ifa(ifa);
854errout:
855 return ERR_PTR(err);
856}
857
858static struct in_ifaddr *find_matching_ifa(struct in_ifaddr *ifa)
859{
860 struct in_device *in_dev = ifa->ifa_dev;
861 struct in_ifaddr *ifa1, **ifap;
862
863 if (!ifa->ifa_local)
864 return NULL;
865
866 for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL;
867 ifap = &ifa1->ifa_next) {
868 if (ifa1->ifa_mask == ifa->ifa_mask &&
869 inet_ifa_match(ifa1->ifa_address, ifa) &&
870 ifa1->ifa_local == ifa->ifa_local)
871 return ifa1;
872 }
873 return NULL;
874}
875
876static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
877 struct netlink_ext_ack *extack)
878{
879 struct net *net = sock_net(skb->sk);
880 struct in_ifaddr *ifa;
881 struct in_ifaddr *ifa_existing;
882 __u32 valid_lft = INFINITY_LIFE_TIME;
883 __u32 prefered_lft = INFINITY_LIFE_TIME;
884
885 ASSERT_RTNL();
886
887 ifa = rtm_to_ifaddr(net, nlh, &valid_lft, &prefered_lft);
888 if (IS_ERR(ifa))
889 return PTR_ERR(ifa);
890
891 ifa_existing = find_matching_ifa(ifa);
892 if (!ifa_existing) {
893 /* It would be best to check for !NLM_F_CREATE here but
894 * userspace already relies on not having to provide this.
895 */
896 set_ifa_lifetime(ifa, valid_lft, prefered_lft);
897 if (ifa->ifa_flags & IFA_F_MCAUTOJOIN) {
898 int ret = ip_mc_config(net->ipv4.mc_autojoin_sk,
899 true, ifa);
900
901 if (ret < 0) {
902 inet_free_ifa(ifa);
903 return ret;
904 }
905 }
906 return __inet_insert_ifa(ifa, nlh, NETLINK_CB(skb).portid,
907 extack);
908 } else {
909 inet_free_ifa(ifa);
910
911 if (nlh->nlmsg_flags & NLM_F_EXCL ||
912 !(nlh->nlmsg_flags & NLM_F_REPLACE))
913 return -EEXIST;
914 ifa = ifa_existing;
915 set_ifa_lifetime(ifa, valid_lft, prefered_lft);
916 cancel_delayed_work(&check_lifetime_work);
917 queue_delayed_work(system_power_efficient_wq,
918 &check_lifetime_work, 0);
919 rtmsg_ifa(RTM_NEWADDR, ifa, nlh, NETLINK_CB(skb).portid);
920 }
921 return 0;
922}
923
924/*
925 * Determine a default network mask, based on the IP address.
926 */
927
928static int inet_abc_len(__be32 addr)
929{
930 int rc = -1; /* Something else, probably a multicast. */
931
932 if (ipv4_is_zeronet(addr))
933 rc = 0;
934 else {
935 __u32 haddr = ntohl(addr);
936
937 if (IN_CLASSA(haddr))
938 rc = 8;
939 else if (IN_CLASSB(haddr))
940 rc = 16;
941 else if (IN_CLASSC(haddr))
942 rc = 24;
943 }
944
945 return rc;
946}
947
948
949int devinet_ioctl(struct net *net, unsigned int cmd, struct ifreq *ifr)
950{
951 struct sockaddr_in sin_orig;
952 struct sockaddr_in *sin = (struct sockaddr_in *)&ifr->ifr_addr;
953 struct in_device *in_dev;
954 struct in_ifaddr **ifap = NULL;
955 struct in_ifaddr *ifa = NULL;
956 struct net_device *dev;
957 char *colon;
958 int ret = -EFAULT;
959 int tryaddrmatch = 0;
960
961 ifr->ifr_name[IFNAMSIZ - 1] = 0;
962
963 /* save original address for comparison */
964 memcpy(&sin_orig, sin, sizeof(*sin));
965
966 colon = strchr(ifr->ifr_name, ':');
967 if (colon)
968 *colon = 0;
969
970 dev_load(net, ifr->ifr_name);
971
972 switch (cmd) {
973 case SIOCGIFADDR: /* Get interface address */
974 case SIOCGIFBRDADDR: /* Get the broadcast address */
975 case SIOCGIFDSTADDR: /* Get the destination address */
976 case SIOCGIFNETMASK: /* Get the netmask for the interface */
977 /* Note that these ioctls will not sleep,
978 so that we do not impose a lock.
979 One day we will be forced to put shlock here (I mean SMP)
980 */
981 tryaddrmatch = (sin_orig.sin_family == AF_INET);
982 memset(sin, 0, sizeof(*sin));
983 sin->sin_family = AF_INET;
984 break;
985
986 case SIOCSIFFLAGS:
987 ret = -EPERM;
988 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
989 goto out;
990 break;
991 case SIOCSIFADDR: /* Set interface address (and family) */
992 case SIOCSIFBRDADDR: /* Set the broadcast address */
993 case SIOCSIFDSTADDR: /* Set the destination address */
994 case SIOCSIFNETMASK: /* Set the netmask for the interface */
995 ret = -EPERM;
996 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
997 goto out;
998 ret = -EINVAL;
999 if (sin->sin_family != AF_INET)
1000 goto out;
1001 break;
1002 default:
1003 ret = -EINVAL;
1004 goto out;
1005 }
1006
1007 rtnl_lock();
1008
1009 ret = -ENODEV;
1010 dev = __dev_get_by_name(net, ifr->ifr_name);
1011 if (!dev)
1012 goto done;
1013
1014 if (colon)
1015 *colon = ':';
1016
1017 in_dev = __in_dev_get_rtnl(dev);
1018 if (in_dev) {
1019 if (tryaddrmatch) {
1020 /* Matthias Andree */
1021 /* compare label and address (4.4BSD style) */
1022 /* note: we only do this for a limited set of ioctls
1023 and only if the original address family was AF_INET.
1024 This is checked above. */
1025 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
1026 ifap = &ifa->ifa_next) {
1027 if (!strcmp(ifr->ifr_name, ifa->ifa_label) &&
1028 sin_orig.sin_addr.s_addr ==
1029 ifa->ifa_local) {
1030 break; /* found */
1031 }
1032 }
1033 }
1034 /* we didn't get a match, maybe the application is
1035 4.3BSD-style and passed in junk so we fall back to
1036 comparing just the label */
1037 if (!ifa) {
1038 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
1039 ifap = &ifa->ifa_next)
1040 if (!strcmp(ifr->ifr_name, ifa->ifa_label))
1041 break;
1042 }
1043 }
1044
1045 ret = -EADDRNOTAVAIL;
1046 if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS)
1047 goto done;
1048
1049 switch (cmd) {
1050 case SIOCGIFADDR: /* Get interface address */
1051 ret = 0;
1052 sin->sin_addr.s_addr = ifa->ifa_local;
1053 break;
1054
1055 case SIOCGIFBRDADDR: /* Get the broadcast address */
1056 ret = 0;
1057 sin->sin_addr.s_addr = ifa->ifa_broadcast;
1058 break;
1059
1060 case SIOCGIFDSTADDR: /* Get the destination address */
1061 ret = 0;
1062 sin->sin_addr.s_addr = ifa->ifa_address;
1063 break;
1064
1065 case SIOCGIFNETMASK: /* Get the netmask for the interface */
1066 ret = 0;
1067 sin->sin_addr.s_addr = ifa->ifa_mask;
1068 break;
1069
1070 case SIOCSIFFLAGS:
1071 if (colon) {
1072 ret = -EADDRNOTAVAIL;
1073 if (!ifa)
1074 break;
1075 ret = 0;
1076 if (!(ifr->ifr_flags & IFF_UP))
1077 inet_del_ifa(in_dev, ifap, 1);
1078 break;
1079 }
1080 ret = dev_change_flags(dev, ifr->ifr_flags);
1081 break;
1082
1083 case SIOCSIFADDR: /* Set interface address (and family) */
1084 ret = -EINVAL;
1085 if (inet_abc_len(sin->sin_addr.s_addr) < 0)
1086 break;
1087
1088 if (!ifa) {
1089 ret = -ENOBUFS;
1090 ifa = inet_alloc_ifa();
1091 if (!ifa)
1092 break;
1093 INIT_HLIST_NODE(&ifa->hash);
1094 if (colon)
1095 memcpy(ifa->ifa_label, ifr->ifr_name, IFNAMSIZ);
1096 else
1097 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1098 } else {
1099 ret = 0;
1100 if (ifa->ifa_local == sin->sin_addr.s_addr)
1101 break;
1102 inet_del_ifa(in_dev, ifap, 0);
1103 ifa->ifa_broadcast = 0;
1104 ifa->ifa_scope = 0;
1105 }
1106
1107 ifa->ifa_address = ifa->ifa_local = sin->sin_addr.s_addr;
1108
1109 if (!(dev->flags & IFF_POINTOPOINT)) {
1110 ifa->ifa_prefixlen = inet_abc_len(ifa->ifa_address);
1111 ifa->ifa_mask = inet_make_mask(ifa->ifa_prefixlen);
1112 if ((dev->flags & IFF_BROADCAST) &&
1113 ifa->ifa_prefixlen < 31)
1114 ifa->ifa_broadcast = ifa->ifa_address |
1115 ~ifa->ifa_mask;
1116 } else {
1117 ifa->ifa_prefixlen = 32;
1118 ifa->ifa_mask = inet_make_mask(32);
1119 }
1120 set_ifa_lifetime(ifa, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1121 ret = inet_set_ifa(dev, ifa);
1122 break;
1123
1124 case SIOCSIFBRDADDR: /* Set the broadcast address */
1125 ret = 0;
1126 if (ifa->ifa_broadcast != sin->sin_addr.s_addr) {
1127 inet_del_ifa(in_dev, ifap, 0);
1128 ifa->ifa_broadcast = sin->sin_addr.s_addr;
1129 inet_insert_ifa(ifa);
1130 }
1131 break;
1132
1133 case SIOCSIFDSTADDR: /* Set the destination address */
1134 ret = 0;
1135 if (ifa->ifa_address == sin->sin_addr.s_addr)
1136 break;
1137 ret = -EINVAL;
1138 if (inet_abc_len(sin->sin_addr.s_addr) < 0)
1139 break;
1140 ret = 0;
1141 inet_del_ifa(in_dev, ifap, 0);
1142 ifa->ifa_address = sin->sin_addr.s_addr;
1143 inet_insert_ifa(ifa);
1144 break;
1145
1146 case SIOCSIFNETMASK: /* Set the netmask for the interface */
1147
1148 /*
1149 * The mask we set must be legal.
1150 */
1151 ret = -EINVAL;
1152 if (bad_mask(sin->sin_addr.s_addr, 0))
1153 break;
1154 ret = 0;
1155 if (ifa->ifa_mask != sin->sin_addr.s_addr) {
1156 __be32 old_mask = ifa->ifa_mask;
1157 inet_del_ifa(in_dev, ifap, 0);
1158 ifa->ifa_mask = sin->sin_addr.s_addr;
1159 ifa->ifa_prefixlen = inet_mask_len(ifa->ifa_mask);
1160
1161 /* See if current broadcast address matches
1162 * with current netmask, then recalculate
1163 * the broadcast address. Otherwise it's a
1164 * funny address, so don't touch it since
1165 * the user seems to know what (s)he's doing...
1166 */
1167 if ((dev->flags & IFF_BROADCAST) &&
1168 (ifa->ifa_prefixlen < 31) &&
1169 (ifa->ifa_broadcast ==
1170 (ifa->ifa_local|~old_mask))) {
1171 ifa->ifa_broadcast = (ifa->ifa_local |
1172 ~sin->sin_addr.s_addr);
1173 }
1174 inet_insert_ifa(ifa);
1175 }
1176 break;
1177 }
1178done:
1179 rtnl_unlock();
1180out:
1181 return ret;
1182}
1183
1184static int inet_gifconf(struct net_device *dev, char __user *buf, int len, int size)
1185{
1186 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1187 struct in_ifaddr *ifa;
1188 struct ifreq ifr;
1189 int done = 0;
1190
1191 if (WARN_ON(size > sizeof(struct ifreq)))
1192 goto out;
1193
1194 if (!in_dev)
1195 goto out;
1196
1197 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1198 if (!buf) {
1199 done += size;
1200 continue;
1201 }
1202 if (len < size)
1203 break;
1204 memset(&ifr, 0, sizeof(struct ifreq));
1205 strcpy(ifr.ifr_name, ifa->ifa_label);
1206
1207 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_family = AF_INET;
1208 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_addr.s_addr =
1209 ifa->ifa_local;
1210
1211 if (copy_to_user(buf + done, &ifr, size)) {
1212 done = -EFAULT;
1213 break;
1214 }
1215 len -= size;
1216 done += size;
1217 }
1218out:
1219 return done;
1220}
1221
1222static __be32 in_dev_select_addr(const struct in_device *in_dev,
1223 int scope)
1224{
1225 for_primary_ifa(in_dev) {
1226 if (ifa->ifa_scope != RT_SCOPE_LINK &&
1227 ifa->ifa_scope <= scope)
1228 return ifa->ifa_local;
1229 } endfor_ifa(in_dev);
1230
1231 return 0;
1232}
1233
1234__be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope)
1235{
1236 __be32 addr = 0;
1237 struct in_device *in_dev;
1238 struct net *net = dev_net(dev);
1239 int master_idx;
1240
1241 rcu_read_lock();
1242 in_dev = __in_dev_get_rcu(dev);
1243 if (!in_dev)
1244 goto no_in_dev;
1245
1246 for_primary_ifa(in_dev) {
1247 if (ifa->ifa_scope > scope)
1248 continue;
1249 if (!dst || inet_ifa_match(dst, ifa)) {
1250 addr = ifa->ifa_local;
1251 break;
1252 }
1253 if (!addr)
1254 addr = ifa->ifa_local;
1255 } endfor_ifa(in_dev);
1256
1257 if (addr)
1258 goto out_unlock;
1259no_in_dev:
1260 master_idx = l3mdev_master_ifindex_rcu(dev);
1261
1262 /* For VRFs, the VRF device takes the place of the loopback device,
1263 * with addresses on it being preferred. Note in such cases the
1264 * loopback device will be among the devices that fail the master_idx
1265 * equality check in the loop below.
1266 */
1267 if (master_idx &&
1268 (dev = dev_get_by_index_rcu(net, master_idx)) &&
1269 (in_dev = __in_dev_get_rcu(dev))) {
1270 addr = in_dev_select_addr(in_dev, scope);
1271 if (addr)
1272 goto out_unlock;
1273 }
1274
1275 /* Not loopback addresses on loopback should be preferred
1276 in this case. It is important that lo is the first interface
1277 in dev_base list.
1278 */
1279 for_each_netdev_rcu(net, dev) {
1280 if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1281 continue;
1282
1283 in_dev = __in_dev_get_rcu(dev);
1284 if (!in_dev)
1285 continue;
1286
1287 addr = in_dev_select_addr(in_dev, scope);
1288 if (addr)
1289 goto out_unlock;
1290 }
1291out_unlock:
1292 rcu_read_unlock();
1293 return addr;
1294}
1295EXPORT_SYMBOL(inet_select_addr);
1296
1297static __be32 confirm_addr_indev(struct in_device *in_dev, __be32 dst,
1298 __be32 local, int scope)
1299{
1300 int same = 0;
1301 __be32 addr = 0;
1302
1303 for_ifa(in_dev) {
1304 if (!addr &&
1305 (local == ifa->ifa_local || !local) &&
1306 ifa->ifa_scope <= scope) {
1307 addr = ifa->ifa_local;
1308 if (same)
1309 break;
1310 }
1311 if (!same) {
1312 same = (!local || inet_ifa_match(local, ifa)) &&
1313 (!dst || inet_ifa_match(dst, ifa));
1314 if (same && addr) {
1315 if (local || !dst)
1316 break;
1317 /* Is the selected addr into dst subnet? */
1318 if (inet_ifa_match(addr, ifa))
1319 break;
1320 /* No, then can we use new local src? */
1321 if (ifa->ifa_scope <= scope) {
1322 addr = ifa->ifa_local;
1323 break;
1324 }
1325 /* search for large dst subnet for addr */
1326 same = 0;
1327 }
1328 }
1329 } endfor_ifa(in_dev);
1330
1331 return same ? addr : 0;
1332}
1333
1334/*
1335 * Confirm that local IP address exists using wildcards:
1336 * - net: netns to check, cannot be NULL
1337 * - in_dev: only on this interface, NULL=any interface
1338 * - dst: only in the same subnet as dst, 0=any dst
1339 * - local: address, 0=autoselect the local address
1340 * - scope: maximum allowed scope value for the local address
1341 */
1342__be32 inet_confirm_addr(struct net *net, struct in_device *in_dev,
1343 __be32 dst, __be32 local, int scope)
1344{
1345 __be32 addr = 0;
1346 struct net_device *dev;
1347
1348 if (in_dev)
1349 return confirm_addr_indev(in_dev, dst, local, scope);
1350
1351 rcu_read_lock();
1352 for_each_netdev_rcu(net, dev) {
1353 in_dev = __in_dev_get_rcu(dev);
1354 if (in_dev) {
1355 addr = confirm_addr_indev(in_dev, dst, local, scope);
1356 if (addr)
1357 break;
1358 }
1359 }
1360 rcu_read_unlock();
1361
1362 return addr;
1363}
1364EXPORT_SYMBOL(inet_confirm_addr);
1365
1366/*
1367 * Device notifier
1368 */
1369
1370int register_inetaddr_notifier(struct notifier_block *nb)
1371{
1372 return blocking_notifier_chain_register(&inetaddr_chain, nb);
1373}
1374EXPORT_SYMBOL(register_inetaddr_notifier);
1375
1376int unregister_inetaddr_notifier(struct notifier_block *nb)
1377{
1378 return blocking_notifier_chain_unregister(&inetaddr_chain, nb);
1379}
1380EXPORT_SYMBOL(unregister_inetaddr_notifier);
1381
1382int register_inetaddr_validator_notifier(struct notifier_block *nb)
1383{
1384 return blocking_notifier_chain_register(&inetaddr_validator_chain, nb);
1385}
1386EXPORT_SYMBOL(register_inetaddr_validator_notifier);
1387
1388int unregister_inetaddr_validator_notifier(struct notifier_block *nb)
1389{
1390 return blocking_notifier_chain_unregister(&inetaddr_validator_chain,
1391 nb);
1392}
1393EXPORT_SYMBOL(unregister_inetaddr_validator_notifier);
1394
1395/* Rename ifa_labels for a device name change. Make some effort to preserve
1396 * existing alias numbering and to create unique labels if possible.
1397*/
1398static void inetdev_changename(struct net_device *dev, struct in_device *in_dev)
1399{
1400 struct in_ifaddr *ifa;
1401 int named = 0;
1402
1403 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1404 char old[IFNAMSIZ], *dot;
1405
1406 memcpy(old, ifa->ifa_label, IFNAMSIZ);
1407 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1408 if (named++ == 0)
1409 goto skip;
1410 dot = strchr(old, ':');
1411 if (!dot) {
1412 sprintf(old, ":%d", named);
1413 dot = old;
1414 }
1415 if (strlen(dot) + strlen(dev->name) < IFNAMSIZ)
1416 strcat(ifa->ifa_label, dot);
1417 else
1418 strcpy(ifa->ifa_label + (IFNAMSIZ - strlen(dot) - 1), dot);
1419skip:
1420 rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0);
1421 }
1422}
1423
1424static bool inetdev_valid_mtu(unsigned int mtu)
1425{
1426 return mtu >= IPV4_MIN_MTU;
1427}
1428
1429static void inetdev_send_gratuitous_arp(struct net_device *dev,
1430 struct in_device *in_dev)
1431
1432{
1433 struct in_ifaddr *ifa;
1434
1435 for (ifa = in_dev->ifa_list; ifa;
1436 ifa = ifa->ifa_next) {
1437 arp_send(ARPOP_REQUEST, ETH_P_ARP,
1438 ifa->ifa_local, dev,
1439 ifa->ifa_local, NULL,
1440 dev->dev_addr, NULL);
1441 }
1442}
1443
1444/* Called only under RTNL semaphore */
1445
1446static int inetdev_event(struct notifier_block *this, unsigned long event,
1447 void *ptr)
1448{
1449 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1450 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1451
1452 ASSERT_RTNL();
1453
1454 if (!in_dev) {
1455 if (event == NETDEV_REGISTER) {
1456 in_dev = inetdev_init(dev);
1457 if (IS_ERR(in_dev))
1458 return notifier_from_errno(PTR_ERR(in_dev));
1459 if (dev->flags & IFF_LOOPBACK) {
1460 IN_DEV_CONF_SET(in_dev, NOXFRM, 1);
1461 IN_DEV_CONF_SET(in_dev, NOPOLICY, 1);
1462 }
1463 } else if (event == NETDEV_CHANGEMTU) {
1464 /* Re-enabling IP */
1465 if (inetdev_valid_mtu(dev->mtu))
1466 in_dev = inetdev_init(dev);
1467 }
1468 goto out;
1469 }
1470
1471 switch (event) {
1472 case NETDEV_REGISTER:
1473 pr_debug("%s: bug\n", __func__);
1474 RCU_INIT_POINTER(dev->ip_ptr, NULL);
1475 break;
1476 case NETDEV_UP:
1477 if (!inetdev_valid_mtu(dev->mtu))
1478 break;
1479 if (dev->flags & IFF_LOOPBACK) {
1480 struct in_ifaddr *ifa = inet_alloc_ifa();
1481
1482 if (ifa) {
1483 INIT_HLIST_NODE(&ifa->hash);
1484 ifa->ifa_local =
1485 ifa->ifa_address = htonl(INADDR_LOOPBACK);
1486 ifa->ifa_prefixlen = 8;
1487 ifa->ifa_mask = inet_make_mask(8);
1488 in_dev_hold(in_dev);
1489 ifa->ifa_dev = in_dev;
1490 ifa->ifa_scope = RT_SCOPE_HOST;
1491 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1492 set_ifa_lifetime(ifa, INFINITY_LIFE_TIME,
1493 INFINITY_LIFE_TIME);
1494 ipv4_devconf_setall(in_dev);
1495 neigh_parms_data_state_setall(in_dev->arp_parms);
1496 inet_insert_ifa(ifa);
1497 }
1498 }
1499 ip_mc_up(in_dev);
1500 /* fall through */
1501 case NETDEV_CHANGEADDR:
1502 if (!IN_DEV_ARP_NOTIFY(in_dev))
1503 break;
1504 /* fall through */
1505 case NETDEV_NOTIFY_PEERS:
1506 /* Send gratuitous ARP to notify of link change */
1507 inetdev_send_gratuitous_arp(dev, in_dev);
1508 break;
1509 case NETDEV_DOWN:
1510 ip_mc_down(in_dev);
1511 break;
1512 case NETDEV_PRE_TYPE_CHANGE:
1513 ip_mc_unmap(in_dev);
1514 break;
1515 case NETDEV_POST_TYPE_CHANGE:
1516 ip_mc_remap(in_dev);
1517 break;
1518 case NETDEV_CHANGEMTU:
1519 if (inetdev_valid_mtu(dev->mtu))
1520 break;
1521 /* disable IP when MTU is not enough */
1522 /* fall through */
1523 case NETDEV_UNREGISTER:
1524 inetdev_destroy(in_dev);
1525 break;
1526 case NETDEV_CHANGENAME:
1527 /* Do not notify about label change, this event is
1528 * not interesting to applications using netlink.
1529 */
1530 inetdev_changename(dev, in_dev);
1531
1532 devinet_sysctl_unregister(in_dev);
1533 devinet_sysctl_register(in_dev);
1534 break;
1535 }
1536out:
1537 return NOTIFY_DONE;
1538}
1539
1540static struct notifier_block ip_netdev_notifier = {
1541 .notifier_call = inetdev_event,
1542};
1543
1544static size_t inet_nlmsg_size(void)
1545{
1546 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
1547 + nla_total_size(4) /* IFA_ADDRESS */
1548 + nla_total_size(4) /* IFA_LOCAL */
1549 + nla_total_size(4) /* IFA_BROADCAST */
1550 + nla_total_size(IFNAMSIZ) /* IFA_LABEL */
1551 + nla_total_size(4) /* IFA_FLAGS */
1552 + nla_total_size(sizeof(struct ifa_cacheinfo)); /* IFA_CACHEINFO */
1553}
1554
1555static inline u32 cstamp_delta(unsigned long cstamp)
1556{
1557 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
1558}
1559
1560static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
1561 unsigned long tstamp, u32 preferred, u32 valid)
1562{
1563 struct ifa_cacheinfo ci;
1564
1565 ci.cstamp = cstamp_delta(cstamp);
1566 ci.tstamp = cstamp_delta(tstamp);
1567 ci.ifa_prefered = preferred;
1568 ci.ifa_valid = valid;
1569
1570 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
1571}
1572
1573static int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa,
1574 u32 portid, u32 seq, int event, unsigned int flags)
1575{
1576 struct ifaddrmsg *ifm;
1577 struct nlmsghdr *nlh;
1578 u32 preferred, valid;
1579
1580 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*ifm), flags);
1581 if (!nlh)
1582 return -EMSGSIZE;
1583
1584 ifm = nlmsg_data(nlh);
1585 ifm->ifa_family = AF_INET;
1586 ifm->ifa_prefixlen = ifa->ifa_prefixlen;
1587 ifm->ifa_flags = ifa->ifa_flags;
1588 ifm->ifa_scope = ifa->ifa_scope;
1589 ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
1590
1591 if (!(ifm->ifa_flags & IFA_F_PERMANENT)) {
1592 preferred = ifa->ifa_preferred_lft;
1593 valid = ifa->ifa_valid_lft;
1594 if (preferred != INFINITY_LIFE_TIME) {
1595 long tval = (jiffies - ifa->ifa_tstamp) / HZ;
1596
1597 if (preferred > tval)
1598 preferred -= tval;
1599 else
1600 preferred = 0;
1601 if (valid != INFINITY_LIFE_TIME) {
1602 if (valid > tval)
1603 valid -= tval;
1604 else
1605 valid = 0;
1606 }
1607 }
1608 } else {
1609 preferred = INFINITY_LIFE_TIME;
1610 valid = INFINITY_LIFE_TIME;
1611 }
1612 if ((ifa->ifa_address &&
1613 nla_put_in_addr(skb, IFA_ADDRESS, ifa->ifa_address)) ||
1614 (ifa->ifa_local &&
1615 nla_put_in_addr(skb, IFA_LOCAL, ifa->ifa_local)) ||
1616 (ifa->ifa_broadcast &&
1617 nla_put_in_addr(skb, IFA_BROADCAST, ifa->ifa_broadcast)) ||
1618 (ifa->ifa_label[0] &&
1619 nla_put_string(skb, IFA_LABEL, ifa->ifa_label)) ||
1620 nla_put_u32(skb, IFA_FLAGS, ifa->ifa_flags) ||
1621 put_cacheinfo(skb, ifa->ifa_cstamp, ifa->ifa_tstamp,
1622 preferred, valid))
1623 goto nla_put_failure;
1624
1625 nlmsg_end(skb, nlh);
1626 return 0;
1627
1628nla_put_failure:
1629 nlmsg_cancel(skb, nlh);
1630 return -EMSGSIZE;
1631}
1632
1633static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
1634{
1635 struct net *net = sock_net(skb->sk);
1636 int h, s_h;
1637 int idx, s_idx;
1638 int ip_idx, s_ip_idx;
1639 struct net_device *dev;
1640 struct in_device *in_dev;
1641 struct in_ifaddr *ifa;
1642 struct hlist_head *head;
1643
1644 s_h = cb->args[0];
1645 s_idx = idx = cb->args[1];
1646 s_ip_idx = ip_idx = cb->args[2];
1647
1648 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1649 idx = 0;
1650 head = &net->dev_index_head[h];
1651 rcu_read_lock();
1652 cb->seq = atomic_read(&net->ipv4.dev_addr_genid) ^
1653 net->dev_base_seq;
1654 hlist_for_each_entry_rcu(dev, head, index_hlist) {
1655 if (idx < s_idx)
1656 goto cont;
1657 if (h > s_h || idx > s_idx)
1658 s_ip_idx = 0;
1659 in_dev = __in_dev_get_rcu(dev);
1660 if (!in_dev)
1661 goto cont;
1662
1663 for (ifa = in_dev->ifa_list, ip_idx = 0; ifa;
1664 ifa = ifa->ifa_next, ip_idx++) {
1665 if (ip_idx < s_ip_idx)
1666 continue;
1667 if (inet_fill_ifaddr(skb, ifa,
1668 NETLINK_CB(cb->skb).portid,
1669 cb->nlh->nlmsg_seq,
1670 RTM_NEWADDR, NLM_F_MULTI) < 0) {
1671 rcu_read_unlock();
1672 goto done;
1673 }
1674 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1675 }
1676cont:
1677 idx++;
1678 }
1679 rcu_read_unlock();
1680 }
1681
1682done:
1683 cb->args[0] = h;
1684 cb->args[1] = idx;
1685 cb->args[2] = ip_idx;
1686
1687 return skb->len;
1688}
1689
1690static void rtmsg_ifa(int event, struct in_ifaddr *ifa, struct nlmsghdr *nlh,
1691 u32 portid)
1692{
1693 struct sk_buff *skb;
1694 u32 seq = nlh ? nlh->nlmsg_seq : 0;
1695 int err = -ENOBUFS;
1696 struct net *net;
1697
1698 net = dev_net(ifa->ifa_dev->dev);
1699 skb = nlmsg_new(inet_nlmsg_size(), GFP_KERNEL);
1700 if (!skb)
1701 goto errout;
1702
1703 err = inet_fill_ifaddr(skb, ifa, portid, seq, event, 0);
1704 if (err < 0) {
1705 /* -EMSGSIZE implies BUG in inet_nlmsg_size() */
1706 WARN_ON(err == -EMSGSIZE);
1707 kfree_skb(skb);
1708 goto errout;
1709 }
1710 rtnl_notify(skb, net, portid, RTNLGRP_IPV4_IFADDR, nlh, GFP_KERNEL);
1711 return;
1712errout:
1713 if (err < 0)
1714 rtnl_set_sk_err(net, RTNLGRP_IPV4_IFADDR, err);
1715}
1716
1717static size_t inet_get_link_af_size(const struct net_device *dev,
1718 u32 ext_filter_mask)
1719{
1720 struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr);
1721
1722 if (!in_dev)
1723 return 0;
1724
1725 return nla_total_size(IPV4_DEVCONF_MAX * 4); /* IFLA_INET_CONF */
1726}
1727
1728static int inet_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
1729 u32 ext_filter_mask)
1730{
1731 struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr);
1732 struct nlattr *nla;
1733 int i;
1734
1735 if (!in_dev)
1736 return -ENODATA;
1737
1738 nla = nla_reserve(skb, IFLA_INET_CONF, IPV4_DEVCONF_MAX * 4);
1739 if (!nla)
1740 return -EMSGSIZE;
1741
1742 for (i = 0; i < IPV4_DEVCONF_MAX; i++)
1743 ((u32 *) nla_data(nla))[i] = in_dev->cnf.data[i];
1744
1745 return 0;
1746}
1747
1748static const struct nla_policy inet_af_policy[IFLA_INET_MAX+1] = {
1749 [IFLA_INET_CONF] = { .type = NLA_NESTED },
1750};
1751
1752static int inet_validate_link_af(const struct net_device *dev,
1753 const struct nlattr *nla)
1754{
1755 struct nlattr *a, *tb[IFLA_INET_MAX+1];
1756 int err, rem;
1757
1758 if (dev && !__in_dev_get_rcu(dev))
1759 return -EAFNOSUPPORT;
1760
1761 err = nla_parse_nested(tb, IFLA_INET_MAX, nla, inet_af_policy, NULL);
1762 if (err < 0)
1763 return err;
1764
1765 if (tb[IFLA_INET_CONF]) {
1766 nla_for_each_nested(a, tb[IFLA_INET_CONF], rem) {
1767 int cfgid = nla_type(a);
1768
1769 if (nla_len(a) < 4)
1770 return -EINVAL;
1771
1772 if (cfgid <= 0 || cfgid > IPV4_DEVCONF_MAX)
1773 return -EINVAL;
1774 }
1775 }
1776
1777 return 0;
1778}
1779
1780static int inet_set_link_af(struct net_device *dev, const struct nlattr *nla)
1781{
1782 struct in_device *in_dev = __in_dev_get_rcu(dev);
1783 struct nlattr *a, *tb[IFLA_INET_MAX+1];
1784 int rem;
1785
1786 if (!in_dev)
1787 return -EAFNOSUPPORT;
1788
1789 if (nla_parse_nested(tb, IFLA_INET_MAX, nla, NULL, NULL) < 0)
1790 BUG();
1791
1792 if (tb[IFLA_INET_CONF]) {
1793 nla_for_each_nested(a, tb[IFLA_INET_CONF], rem)
1794 ipv4_devconf_set(in_dev, nla_type(a), nla_get_u32(a));
1795 }
1796
1797 return 0;
1798}
1799
1800static int inet_netconf_msgsize_devconf(int type)
1801{
1802 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
1803 + nla_total_size(4); /* NETCONFA_IFINDEX */
1804 bool all = false;
1805
1806 if (type == NETCONFA_ALL)
1807 all = true;
1808
1809 if (all || type == NETCONFA_FORWARDING)
1810 size += nla_total_size(4);
1811 if (all || type == NETCONFA_RP_FILTER)
1812 size += nla_total_size(4);
1813 if (all || type == NETCONFA_MC_FORWARDING)
1814 size += nla_total_size(4);
1815 if (all || type == NETCONFA_PROXY_NEIGH)
1816 size += nla_total_size(4);
1817 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
1818 size += nla_total_size(4);
1819
1820 return size;
1821}
1822
1823static int inet_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
1824 struct ipv4_devconf *devconf, u32 portid,
1825 u32 seq, int event, unsigned int flags,
1826 int type)
1827{
1828 struct nlmsghdr *nlh;
1829 struct netconfmsg *ncm;
1830 bool all = false;
1831
1832 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
1833 flags);
1834 if (!nlh)
1835 return -EMSGSIZE;
1836
1837 if (type == NETCONFA_ALL)
1838 all = true;
1839
1840 ncm = nlmsg_data(nlh);
1841 ncm->ncm_family = AF_INET;
1842
1843 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
1844 goto nla_put_failure;
1845
1846 if (!devconf)
1847 goto out;
1848
1849 if ((all || type == NETCONFA_FORWARDING) &&
1850 nla_put_s32(skb, NETCONFA_FORWARDING,
1851 IPV4_DEVCONF(*devconf, FORWARDING)) < 0)
1852 goto nla_put_failure;
1853 if ((all || type == NETCONFA_RP_FILTER) &&
1854 nla_put_s32(skb, NETCONFA_RP_FILTER,
1855 IPV4_DEVCONF(*devconf, RP_FILTER)) < 0)
1856 goto nla_put_failure;
1857 if ((all || type == NETCONFA_MC_FORWARDING) &&
1858 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
1859 IPV4_DEVCONF(*devconf, MC_FORWARDING)) < 0)
1860 goto nla_put_failure;
1861 if ((all || type == NETCONFA_PROXY_NEIGH) &&
1862 nla_put_s32(skb, NETCONFA_PROXY_NEIGH,
1863 IPV4_DEVCONF(*devconf, PROXY_ARP)) < 0)
1864 goto nla_put_failure;
1865 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
1866 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
1867 IPV4_DEVCONF(*devconf, IGNORE_ROUTES_WITH_LINKDOWN)) < 0)
1868 goto nla_put_failure;
1869
1870out:
1871 nlmsg_end(skb, nlh);
1872 return 0;
1873
1874nla_put_failure:
1875 nlmsg_cancel(skb, nlh);
1876 return -EMSGSIZE;
1877}
1878
1879void inet_netconf_notify_devconf(struct net *net, int event, int type,
1880 int ifindex, struct ipv4_devconf *devconf)
1881{
1882 struct sk_buff *skb;
1883 int err = -ENOBUFS;
1884
1885 skb = nlmsg_new(inet_netconf_msgsize_devconf(type), GFP_KERNEL);
1886 if (!skb)
1887 goto errout;
1888
1889 err = inet_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
1890 event, 0, type);
1891 if (err < 0) {
1892 /* -EMSGSIZE implies BUG in inet_netconf_msgsize_devconf() */
1893 WARN_ON(err == -EMSGSIZE);
1894 kfree_skb(skb);
1895 goto errout;
1896 }
1897 rtnl_notify(skb, net, 0, RTNLGRP_IPV4_NETCONF, NULL, GFP_KERNEL);
1898 return;
1899errout:
1900 if (err < 0)
1901 rtnl_set_sk_err(net, RTNLGRP_IPV4_NETCONF, err);
1902}
1903
1904static const struct nla_policy devconf_ipv4_policy[NETCONFA_MAX+1] = {
1905 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
1906 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
1907 [NETCONFA_RP_FILTER] = { .len = sizeof(int) },
1908 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
1909 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
1910};
1911
1912static int inet_netconf_get_devconf(struct sk_buff *in_skb,
1913 struct nlmsghdr *nlh,
1914 struct netlink_ext_ack *extack)
1915{
1916 struct net *net = sock_net(in_skb->sk);
1917 struct nlattr *tb[NETCONFA_MAX+1];
1918 struct netconfmsg *ncm;
1919 struct sk_buff *skb;
1920 struct ipv4_devconf *devconf;
1921 struct in_device *in_dev;
1922 struct net_device *dev;
1923 int ifindex;
1924 int err;
1925
1926 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
1927 devconf_ipv4_policy, extack);
1928 if (err < 0)
1929 goto errout;
1930
1931 err = -EINVAL;
1932 if (!tb[NETCONFA_IFINDEX])
1933 goto errout;
1934
1935 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
1936 switch (ifindex) {
1937 case NETCONFA_IFINDEX_ALL:
1938 devconf = net->ipv4.devconf_all;
1939 break;
1940 case NETCONFA_IFINDEX_DEFAULT:
1941 devconf = net->ipv4.devconf_dflt;
1942 break;
1943 default:
1944 dev = __dev_get_by_index(net, ifindex);
1945 if (!dev)
1946 goto errout;
1947 in_dev = __in_dev_get_rtnl(dev);
1948 if (!in_dev)
1949 goto errout;
1950 devconf = &in_dev->cnf;
1951 break;
1952 }
1953
1954 err = -ENOBUFS;
1955 skb = nlmsg_new(inet_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL);
1956 if (!skb)
1957 goto errout;
1958
1959 err = inet_netconf_fill_devconf(skb, ifindex, devconf,
1960 NETLINK_CB(in_skb).portid,
1961 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
1962 NETCONFA_ALL);
1963 if (err < 0) {
1964 /* -EMSGSIZE implies BUG in inet_netconf_msgsize_devconf() */
1965 WARN_ON(err == -EMSGSIZE);
1966 kfree_skb(skb);
1967 goto errout;
1968 }
1969 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
1970errout:
1971 return err;
1972}
1973
1974static int inet_netconf_dump_devconf(struct sk_buff *skb,
1975 struct netlink_callback *cb)
1976{
1977 struct net *net = sock_net(skb->sk);
1978 int h, s_h;
1979 int idx, s_idx;
1980 struct net_device *dev;
1981 struct in_device *in_dev;
1982 struct hlist_head *head;
1983
1984 s_h = cb->args[0];
1985 s_idx = idx = cb->args[1];
1986
1987 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1988 idx = 0;
1989 head = &net->dev_index_head[h];
1990 rcu_read_lock();
1991 cb->seq = atomic_read(&net->ipv4.dev_addr_genid) ^
1992 net->dev_base_seq;
1993 hlist_for_each_entry_rcu(dev, head, index_hlist) {
1994 if (idx < s_idx)
1995 goto cont;
1996 in_dev = __in_dev_get_rcu(dev);
1997 if (!in_dev)
1998 goto cont;
1999
2000 if (inet_netconf_fill_devconf(skb, dev->ifindex,
2001 &in_dev->cnf,
2002 NETLINK_CB(cb->skb).portid,
2003 cb->nlh->nlmsg_seq,
2004 RTM_NEWNETCONF,
2005 NLM_F_MULTI,
2006 NETCONFA_ALL) < 0) {
2007 rcu_read_unlock();
2008 goto done;
2009 }
2010 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2011cont:
2012 idx++;
2013 }
2014 rcu_read_unlock();
2015 }
2016 if (h == NETDEV_HASHENTRIES) {
2017 if (inet_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
2018 net->ipv4.devconf_all,
2019 NETLINK_CB(cb->skb).portid,
2020 cb->nlh->nlmsg_seq,
2021 RTM_NEWNETCONF, NLM_F_MULTI,
2022 NETCONFA_ALL) < 0)
2023 goto done;
2024 else
2025 h++;
2026 }
2027 if (h == NETDEV_HASHENTRIES + 1) {
2028 if (inet_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
2029 net->ipv4.devconf_dflt,
2030 NETLINK_CB(cb->skb).portid,
2031 cb->nlh->nlmsg_seq,
2032 RTM_NEWNETCONF, NLM_F_MULTI,
2033 NETCONFA_ALL) < 0)
2034 goto done;
2035 else
2036 h++;
2037 }
2038done:
2039 cb->args[0] = h;
2040 cb->args[1] = idx;
2041
2042 return skb->len;
2043}
2044
2045#ifdef CONFIG_SYSCTL
2046
2047static void devinet_copy_dflt_conf(struct net *net, int i)
2048{
2049 struct net_device *dev;
2050
2051 rcu_read_lock();
2052 for_each_netdev_rcu(net, dev) {
2053 struct in_device *in_dev;
2054
2055 in_dev = __in_dev_get_rcu(dev);
2056 if (in_dev && !test_bit(i, in_dev->cnf.state))
2057 in_dev->cnf.data[i] = net->ipv4.devconf_dflt->data[i];
2058 }
2059 rcu_read_unlock();
2060}
2061
2062/* called with RTNL locked */
2063static void inet_forward_change(struct net *net)
2064{
2065 struct net_device *dev;
2066 int on = IPV4_DEVCONF_ALL(net, FORWARDING);
2067
2068 IPV4_DEVCONF_ALL(net, ACCEPT_REDIRECTS) = !on;
2069 IPV4_DEVCONF_DFLT(net, FORWARDING) = on;
2070 inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
2071 NETCONFA_FORWARDING,
2072 NETCONFA_IFINDEX_ALL,
2073 net->ipv4.devconf_all);
2074 inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
2075 NETCONFA_FORWARDING,
2076 NETCONFA_IFINDEX_DEFAULT,
2077 net->ipv4.devconf_dflt);
2078
2079 for_each_netdev(net, dev) {
2080 struct in_device *in_dev;
2081
2082 if (on)
2083 dev_disable_lro(dev);
2084
2085 in_dev = __in_dev_get_rtnl(dev);
2086 if (in_dev) {
2087 IN_DEV_CONF_SET(in_dev, FORWARDING, on);
2088 inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
2089 NETCONFA_FORWARDING,
2090 dev->ifindex, &in_dev->cnf);
2091 }
2092 }
2093}
2094
2095static int devinet_conf_ifindex(struct net *net, struct ipv4_devconf *cnf)
2096{
2097 if (cnf == net->ipv4.devconf_dflt)
2098 return NETCONFA_IFINDEX_DEFAULT;
2099 else if (cnf == net->ipv4.devconf_all)
2100 return NETCONFA_IFINDEX_ALL;
2101 else {
2102 struct in_device *idev
2103 = container_of(cnf, struct in_device, cnf);
2104 return idev->dev->ifindex;
2105 }
2106}
2107
2108static int devinet_conf_proc(struct ctl_table *ctl, int write,
2109 void __user *buffer,
2110 size_t *lenp, loff_t *ppos)
2111{
2112 int old_value = *(int *)ctl->data;
2113 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
2114 int new_value = *(int *)ctl->data;
2115
2116 if (write) {
2117 struct ipv4_devconf *cnf = ctl->extra1;
2118 struct net *net = ctl->extra2;
2119 int i = (int *)ctl->data - cnf->data;
2120 int ifindex;
2121
2122 set_bit(i, cnf->state);
2123
2124 if (cnf == net->ipv4.devconf_dflt)
2125 devinet_copy_dflt_conf(net, i);
2126 if (i == IPV4_DEVCONF_ACCEPT_LOCAL - 1 ||
2127 i == IPV4_DEVCONF_ROUTE_LOCALNET - 1)
2128 if ((new_value == 0) && (old_value != 0))
2129 rt_cache_flush(net);
2130
2131 if (i == IPV4_DEVCONF_RP_FILTER - 1 &&
2132 new_value != old_value) {
2133 ifindex = devinet_conf_ifindex(net, cnf);
2134 inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
2135 NETCONFA_RP_FILTER,
2136 ifindex, cnf);
2137 }
2138 if (i == IPV4_DEVCONF_PROXY_ARP - 1 &&
2139 new_value != old_value) {
2140 ifindex = devinet_conf_ifindex(net, cnf);
2141 inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
2142 NETCONFA_PROXY_NEIGH,
2143 ifindex, cnf);
2144 }
2145 if (i == IPV4_DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN - 1 &&
2146 new_value != old_value) {
2147 ifindex = devinet_conf_ifindex(net, cnf);
2148 inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
2149 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
2150 ifindex, cnf);
2151 }
2152 }
2153
2154 return ret;
2155}
2156
2157static int devinet_sysctl_forward(struct ctl_table *ctl, int write,
2158 void __user *buffer,
2159 size_t *lenp, loff_t *ppos)
2160{
2161 int *valp = ctl->data;
2162 int val = *valp;
2163 loff_t pos = *ppos;
2164 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
2165
2166 if (write && *valp != val) {
2167 struct net *net = ctl->extra2;
2168
2169 if (valp != &IPV4_DEVCONF_DFLT(net, FORWARDING)) {
2170 if (!rtnl_trylock()) {
2171 /* Restore the original values before restarting */
2172 *valp = val;
2173 *ppos = pos;
2174 return restart_syscall();
2175 }
2176 if (valp == &IPV4_DEVCONF_ALL(net, FORWARDING)) {
2177 inet_forward_change(net);
2178 } else {
2179 struct ipv4_devconf *cnf = ctl->extra1;
2180 struct in_device *idev =
2181 container_of(cnf, struct in_device, cnf);
2182 if (*valp)
2183 dev_disable_lro(idev->dev);
2184 inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
2185 NETCONFA_FORWARDING,
2186 idev->dev->ifindex,
2187 cnf);
2188 }
2189 rtnl_unlock();
2190 rt_cache_flush(net);
2191 } else
2192 inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
2193 NETCONFA_FORWARDING,
2194 NETCONFA_IFINDEX_DEFAULT,
2195 net->ipv4.devconf_dflt);
2196 }
2197
2198 return ret;
2199}
2200
2201static int ipv4_doint_and_flush(struct ctl_table *ctl, int write,
2202 void __user *buffer,
2203 size_t *lenp, loff_t *ppos)
2204{
2205 int *valp = ctl->data;
2206 int val = *valp;
2207 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
2208 struct net *net = ctl->extra2;
2209
2210 if (write && *valp != val)
2211 rt_cache_flush(net);
2212
2213 return ret;
2214}
2215
2216#define DEVINET_SYSCTL_ENTRY(attr, name, mval, proc) \
2217 { \
2218 .procname = name, \
2219 .data = ipv4_devconf.data + \
2220 IPV4_DEVCONF_ ## attr - 1, \
2221 .maxlen = sizeof(int), \
2222 .mode = mval, \
2223 .proc_handler = proc, \
2224 .extra1 = &ipv4_devconf, \
2225 }
2226
2227#define DEVINET_SYSCTL_RW_ENTRY(attr, name) \
2228 DEVINET_SYSCTL_ENTRY(attr, name, 0644, devinet_conf_proc)
2229
2230#define DEVINET_SYSCTL_RO_ENTRY(attr, name) \
2231 DEVINET_SYSCTL_ENTRY(attr, name, 0444, devinet_conf_proc)
2232
2233#define DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, proc) \
2234 DEVINET_SYSCTL_ENTRY(attr, name, 0644, proc)
2235
2236#define DEVINET_SYSCTL_FLUSHING_ENTRY(attr, name) \
2237 DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, ipv4_doint_and_flush)
2238
2239static struct devinet_sysctl_table {
2240 struct ctl_table_header *sysctl_header;
2241 struct ctl_table devinet_vars[__IPV4_DEVCONF_MAX];
2242} devinet_sysctl = {
2243 .devinet_vars = {
2244 DEVINET_SYSCTL_COMPLEX_ENTRY(FORWARDING, "forwarding",
2245 devinet_sysctl_forward),
2246 DEVINET_SYSCTL_RO_ENTRY(MC_FORWARDING, "mc_forwarding"),
2247
2248 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_REDIRECTS, "accept_redirects"),
2249 DEVINET_SYSCTL_RW_ENTRY(SECURE_REDIRECTS, "secure_redirects"),
2250 DEVINET_SYSCTL_RW_ENTRY(SHARED_MEDIA, "shared_media"),
2251 DEVINET_SYSCTL_RW_ENTRY(RP_FILTER, "rp_filter"),
2252 DEVINET_SYSCTL_RW_ENTRY(SEND_REDIRECTS, "send_redirects"),
2253 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_SOURCE_ROUTE,
2254 "accept_source_route"),
2255 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_LOCAL, "accept_local"),
2256 DEVINET_SYSCTL_RW_ENTRY(SRC_VMARK, "src_valid_mark"),
2257 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP, "proxy_arp"),
2258 DEVINET_SYSCTL_RW_ENTRY(MEDIUM_ID, "medium_id"),
2259 DEVINET_SYSCTL_RW_ENTRY(BOOTP_RELAY, "bootp_relay"),
2260 DEVINET_SYSCTL_RW_ENTRY(LOG_MARTIANS, "log_martians"),
2261 DEVINET_SYSCTL_RW_ENTRY(TAG, "tag"),
2262 DEVINET_SYSCTL_RW_ENTRY(ARPFILTER, "arp_filter"),
2263 DEVINET_SYSCTL_RW_ENTRY(ARP_ANNOUNCE, "arp_announce"),
2264 DEVINET_SYSCTL_RW_ENTRY(ARP_IGNORE, "arp_ignore"),
2265 DEVINET_SYSCTL_RW_ENTRY(ARP_ACCEPT, "arp_accept"),
2266 DEVINET_SYSCTL_RW_ENTRY(ARP_NOTIFY, "arp_notify"),
2267 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP_PVLAN, "proxy_arp_pvlan"),
2268 DEVINET_SYSCTL_RW_ENTRY(FORCE_IGMP_VERSION,
2269 "force_igmp_version"),
2270 DEVINET_SYSCTL_RW_ENTRY(IGMPV2_UNSOLICITED_REPORT_INTERVAL,
2271 "igmpv2_unsolicited_report_interval"),
2272 DEVINET_SYSCTL_RW_ENTRY(IGMPV3_UNSOLICITED_REPORT_INTERVAL,
2273 "igmpv3_unsolicited_report_interval"),
2274 DEVINET_SYSCTL_RW_ENTRY(IGNORE_ROUTES_WITH_LINKDOWN,
2275 "ignore_routes_with_linkdown"),
2276 DEVINET_SYSCTL_RW_ENTRY(DROP_GRATUITOUS_ARP,
2277 "drop_gratuitous_arp"),
2278
2279 DEVINET_SYSCTL_FLUSHING_ENTRY(NOXFRM, "disable_xfrm"),
2280 DEVINET_SYSCTL_FLUSHING_ENTRY(NOPOLICY, "disable_policy"),
2281 DEVINET_SYSCTL_FLUSHING_ENTRY(PROMOTE_SECONDARIES,
2282 "promote_secondaries"),
2283 DEVINET_SYSCTL_FLUSHING_ENTRY(ROUTE_LOCALNET,
2284 "route_localnet"),
2285 DEVINET_SYSCTL_FLUSHING_ENTRY(DROP_UNICAST_IN_L2_MULTICAST,
2286 "drop_unicast_in_l2_multicast"),
2287 },
2288};
2289
2290static int __devinet_sysctl_register(struct net *net, char *dev_name,
2291 int ifindex, struct ipv4_devconf *p)
2292{
2293 int i;
2294 struct devinet_sysctl_table *t;
2295 char path[sizeof("net/ipv4/conf/") + IFNAMSIZ];
2296
2297 t = kmemdup(&devinet_sysctl, sizeof(*t), GFP_KERNEL);
2298 if (!t)
2299 goto out;
2300
2301 for (i = 0; i < ARRAY_SIZE(t->devinet_vars) - 1; i++) {
2302 t->devinet_vars[i].data += (char *)p - (char *)&ipv4_devconf;
2303 t->devinet_vars[i].extra1 = p;
2304 t->devinet_vars[i].extra2 = net;
2305 }
2306
2307 snprintf(path, sizeof(path), "net/ipv4/conf/%s", dev_name);
2308
2309 t->sysctl_header = register_net_sysctl(net, path, t->devinet_vars);
2310 if (!t->sysctl_header)
2311 goto free;
2312
2313 p->sysctl = t;
2314
2315 inet_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
2316 ifindex, p);
2317 return 0;
2318
2319free:
2320 kfree(t);
2321out:
2322 return -ENOBUFS;
2323}
2324
2325static void __devinet_sysctl_unregister(struct net *net,
2326 struct ipv4_devconf *cnf, int ifindex)
2327{
2328 struct devinet_sysctl_table *t = cnf->sysctl;
2329
2330 if (t) {
2331 cnf->sysctl = NULL;
2332 unregister_net_sysctl_table(t->sysctl_header);
2333 kfree(t);
2334 }
2335
2336 inet_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
2337}
2338
2339static int devinet_sysctl_register(struct in_device *idev)
2340{
2341 int err;
2342
2343 if (!sysctl_dev_name_is_allowed(idev->dev->name))
2344 return -EINVAL;
2345
2346 err = neigh_sysctl_register(idev->dev, idev->arp_parms, NULL);
2347 if (err)
2348 return err;
2349 err = __devinet_sysctl_register(dev_net(idev->dev), idev->dev->name,
2350 idev->dev->ifindex, &idev->cnf);
2351 if (err)
2352 neigh_sysctl_unregister(idev->arp_parms);
2353 return err;
2354}
2355
2356static void devinet_sysctl_unregister(struct in_device *idev)
2357{
2358 struct net *net = dev_net(idev->dev);
2359
2360 __devinet_sysctl_unregister(net, &idev->cnf, idev->dev->ifindex);
2361 neigh_sysctl_unregister(idev->arp_parms);
2362}
2363
2364static struct ctl_table ctl_forward_entry[] = {
2365 {
2366 .procname = "ip_forward",
2367 .data = &ipv4_devconf.data[
2368 IPV4_DEVCONF_FORWARDING - 1],
2369 .maxlen = sizeof(int),
2370 .mode = 0644,
2371 .proc_handler = devinet_sysctl_forward,
2372 .extra1 = &ipv4_devconf,
2373 .extra2 = &init_net,
2374 },
2375 { },
2376};
2377#endif
2378
2379static __net_init int devinet_init_net(struct net *net)
2380{
2381 int err;
2382 struct ipv4_devconf *all, *dflt;
2383#ifdef CONFIG_SYSCTL
2384 struct ctl_table *tbl = ctl_forward_entry;
2385 struct ctl_table_header *forw_hdr;
2386#endif
2387
2388 err = -ENOMEM;
2389 all = &ipv4_devconf;
2390 dflt = &ipv4_devconf_dflt;
2391
2392 if (!net_eq(net, &init_net)) {
2393 all = kmemdup(all, sizeof(ipv4_devconf), GFP_KERNEL);
2394 if (!all)
2395 goto err_alloc_all;
2396
2397 dflt = kmemdup(dflt, sizeof(ipv4_devconf_dflt), GFP_KERNEL);
2398 if (!dflt)
2399 goto err_alloc_dflt;
2400
2401#ifdef CONFIG_SYSCTL
2402 tbl = kmemdup(tbl, sizeof(ctl_forward_entry), GFP_KERNEL);
2403 if (!tbl)
2404 goto err_alloc_ctl;
2405
2406 tbl[0].data = &all->data[IPV4_DEVCONF_FORWARDING - 1];
2407 tbl[0].extra1 = all;
2408 tbl[0].extra2 = net;
2409#endif
2410 }
2411
2412#ifdef CONFIG_SYSCTL
2413 err = __devinet_sysctl_register(net, "all", NETCONFA_IFINDEX_ALL, all);
2414 if (err < 0)
2415 goto err_reg_all;
2416
2417 err = __devinet_sysctl_register(net, "default",
2418 NETCONFA_IFINDEX_DEFAULT, dflt);
2419 if (err < 0)
2420 goto err_reg_dflt;
2421
2422 err = -ENOMEM;
2423 forw_hdr = register_net_sysctl(net, "net/ipv4", tbl);
2424 if (!forw_hdr)
2425 goto err_reg_ctl;
2426 net->ipv4.forw_hdr = forw_hdr;
2427#endif
2428
2429 net->ipv4.devconf_all = all;
2430 net->ipv4.devconf_dflt = dflt;
2431 return 0;
2432
2433#ifdef CONFIG_SYSCTL
2434err_reg_ctl:
2435 __devinet_sysctl_unregister(net, dflt, NETCONFA_IFINDEX_DEFAULT);
2436err_reg_dflt:
2437 __devinet_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL);
2438err_reg_all:
2439 if (tbl != ctl_forward_entry)
2440 kfree(tbl);
2441err_alloc_ctl:
2442#endif
2443 if (dflt != &ipv4_devconf_dflt)
2444 kfree(dflt);
2445err_alloc_dflt:
2446 if (all != &ipv4_devconf)
2447 kfree(all);
2448err_alloc_all:
2449 return err;
2450}
2451
2452static __net_exit void devinet_exit_net(struct net *net)
2453{
2454#ifdef CONFIG_SYSCTL
2455 struct ctl_table *tbl;
2456
2457 tbl = net->ipv4.forw_hdr->ctl_table_arg;
2458 unregister_net_sysctl_table(net->ipv4.forw_hdr);
2459 __devinet_sysctl_unregister(net, net->ipv4.devconf_dflt,
2460 NETCONFA_IFINDEX_DEFAULT);
2461 __devinet_sysctl_unregister(net, net->ipv4.devconf_all,
2462 NETCONFA_IFINDEX_ALL);
2463 kfree(tbl);
2464#endif
2465 kfree(net->ipv4.devconf_dflt);
2466 kfree(net->ipv4.devconf_all);
2467}
2468
2469static __net_initdata struct pernet_operations devinet_ops = {
2470 .init = devinet_init_net,
2471 .exit = devinet_exit_net,
2472};
2473
2474static struct rtnl_af_ops inet_af_ops __read_mostly = {
2475 .family = AF_INET,
2476 .fill_link_af = inet_fill_link_af,
2477 .get_link_af_size = inet_get_link_af_size,
2478 .validate_link_af = inet_validate_link_af,
2479 .set_link_af = inet_set_link_af,
2480};
2481
2482void __init devinet_init(void)
2483{
2484 int i;
2485
2486 for (i = 0; i < IN4_ADDR_HSIZE; i++)
2487 INIT_HLIST_HEAD(&inet_addr_lst[i]);
2488
2489 register_pernet_subsys(&devinet_ops);
2490
2491 register_gifconf(PF_INET, inet_gifconf);
2492 register_netdevice_notifier(&ip_netdev_notifier);
2493
2494 queue_delayed_work(system_power_efficient_wq, &check_lifetime_work, 0);
2495
2496 rtnl_af_register(&inet_af_ops);
2497
2498 rtnl_register(PF_INET, RTM_NEWADDR, inet_rtm_newaddr, NULL, 0);
2499 rtnl_register(PF_INET, RTM_DELADDR, inet_rtm_deladdr, NULL, 0);
2500 rtnl_register(PF_INET, RTM_GETADDR, NULL, inet_dump_ifaddr, 0);
2501 rtnl_register(PF_INET, RTM_GETNETCONF, inet_netconf_get_devconf,
2502 inet_netconf_dump_devconf, 0);
2503}