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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 <linux/bitops.h>
31#include <linux/capability.h>
32#include <linux/module.h>
33#include <linux/types.h>
34#include <linux/kernel.h>
35#include <linux/string.h>
36#include <linux/mm.h>
37#include <linux/socket.h>
38#include <linux/sockios.h>
39#include <linux/in.h>
40#include <linux/errno.h>
41#include <linux/interrupt.h>
42#include <linux/if_addr.h>
43#include <linux/if_ether.h>
44#include <linux/inet.h>
45#include <linux/netdevice.h>
46#include <linux/etherdevice.h>
47#include <linux/skbuff.h>
48#include <linux/init.h>
49#include <linux/notifier.h>
50#include <linux/inetdevice.h>
51#include <linux/igmp.h>
52#include <linux/slab.h>
53#include <linux/hash.h>
54#ifdef CONFIG_SYSCTL
55#include <linux/sysctl.h>
56#endif
57#include <linux/kmod.h>
58
59#include <net/arp.h>
60#include <net/ip.h>
61#include <net/route.h>
62#include <net/ip_fib.h>
63#include <net/rtnetlink.h>
64#include <net/net_namespace.h>
65
66#include "fib_lookup.h"
67
68static struct ipv4_devconf ipv4_devconf = {
69 .data = {
70 [IPV4_DEVCONF_ACCEPT_REDIRECTS - 1] = 1,
71 [IPV4_DEVCONF_SEND_REDIRECTS - 1] = 1,
72 [IPV4_DEVCONF_SECURE_REDIRECTS - 1] = 1,
73 [IPV4_DEVCONF_SHARED_MEDIA - 1] = 1,
74 },
75};
76
77static struct ipv4_devconf ipv4_devconf_dflt = {
78 .data = {
79 [IPV4_DEVCONF_ACCEPT_REDIRECTS - 1] = 1,
80 [IPV4_DEVCONF_SEND_REDIRECTS - 1] = 1,
81 [IPV4_DEVCONF_SECURE_REDIRECTS - 1] = 1,
82 [IPV4_DEVCONF_SHARED_MEDIA - 1] = 1,
83 [IPV4_DEVCONF_ACCEPT_SOURCE_ROUTE - 1] = 1,
84 },
85};
86
87#define IPV4_DEVCONF_DFLT(net, attr) \
88 IPV4_DEVCONF((*net->ipv4.devconf_dflt), attr)
89
90static const struct nla_policy ifa_ipv4_policy[IFA_MAX+1] = {
91 [IFA_LOCAL] = { .type = NLA_U32 },
92 [IFA_ADDRESS] = { .type = NLA_U32 },
93 [IFA_BROADCAST] = { .type = NLA_U32 },
94 [IFA_LABEL] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 },
95};
96
97/* inet_addr_hash's shifting is dependent upon this IN4_ADDR_HSIZE
98 * value. So if you change this define, make appropriate changes to
99 * inet_addr_hash as well.
100 */
101#define IN4_ADDR_HSIZE 256
102static struct hlist_head inet_addr_lst[IN4_ADDR_HSIZE];
103static DEFINE_SPINLOCK(inet_addr_hash_lock);
104
105static inline unsigned int inet_addr_hash(struct net *net, __be32 addr)
106{
107 u32 val = (__force u32) addr ^ hash_ptr(net, 8);
108
109 return ((val ^ (val >> 8) ^ (val >> 16) ^ (val >> 24)) &
110 (IN4_ADDR_HSIZE - 1));
111}
112
113static void inet_hash_insert(struct net *net, struct in_ifaddr *ifa)
114{
115 unsigned int hash = inet_addr_hash(net, ifa->ifa_local);
116
117 spin_lock(&inet_addr_hash_lock);
118 hlist_add_head_rcu(&ifa->hash, &inet_addr_lst[hash]);
119 spin_unlock(&inet_addr_hash_lock);
120}
121
122static void inet_hash_remove(struct in_ifaddr *ifa)
123{
124 spin_lock(&inet_addr_hash_lock);
125 hlist_del_init_rcu(&ifa->hash);
126 spin_unlock(&inet_addr_hash_lock);
127}
128
129/**
130 * __ip_dev_find - find the first device with a given source address.
131 * @net: the net namespace
132 * @addr: the source address
133 * @devref: if true, take a reference on the found device
134 *
135 * If a caller uses devref=false, it should be protected by RCU, or RTNL
136 */
137struct net_device *__ip_dev_find(struct net *net, __be32 addr, bool devref)
138{
139 unsigned int hash = inet_addr_hash(net, addr);
140 struct net_device *result = NULL;
141 struct in_ifaddr *ifa;
142 struct hlist_node *node;
143
144 rcu_read_lock();
145 hlist_for_each_entry_rcu(ifa, node, &inet_addr_lst[hash], hash) {
146 struct net_device *dev = ifa->ifa_dev->dev;
147
148 if (!net_eq(dev_net(dev), net))
149 continue;
150 if (ifa->ifa_local == addr) {
151 result = dev;
152 break;
153 }
154 }
155 if (!result) {
156 struct flowi4 fl4 = { .daddr = addr };
157 struct fib_result res = { 0 };
158 struct fib_table *local;
159
160 /* Fallback to FIB local table so that communication
161 * over loopback subnets work.
162 */
163 local = fib_get_table(net, RT_TABLE_LOCAL);
164 if (local &&
165 !fib_table_lookup(local, &fl4, &res, FIB_LOOKUP_NOREF) &&
166 res.type == RTN_LOCAL)
167 result = FIB_RES_DEV(res);
168 }
169 if (result && devref)
170 dev_hold(result);
171 rcu_read_unlock();
172 return result;
173}
174EXPORT_SYMBOL(__ip_dev_find);
175
176static void rtmsg_ifa(int event, struct in_ifaddr *, struct nlmsghdr *, u32);
177
178static BLOCKING_NOTIFIER_HEAD(inetaddr_chain);
179static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
180 int destroy);
181#ifdef CONFIG_SYSCTL
182static void devinet_sysctl_register(struct in_device *idev);
183static void devinet_sysctl_unregister(struct in_device *idev);
184#else
185static inline void devinet_sysctl_register(struct in_device *idev)
186{
187}
188static inline void devinet_sysctl_unregister(struct in_device *idev)
189{
190}
191#endif
192
193/* Locks all the inet devices. */
194
195static struct in_ifaddr *inet_alloc_ifa(void)
196{
197 return kzalloc(sizeof(struct in_ifaddr), GFP_KERNEL);
198}
199
200static void inet_rcu_free_ifa(struct rcu_head *head)
201{
202 struct in_ifaddr *ifa = container_of(head, struct in_ifaddr, rcu_head);
203 if (ifa->ifa_dev)
204 in_dev_put(ifa->ifa_dev);
205 kfree(ifa);
206}
207
208static inline void inet_free_ifa(struct in_ifaddr *ifa)
209{
210 call_rcu(&ifa->rcu_head, inet_rcu_free_ifa);
211}
212
213void in_dev_finish_destroy(struct in_device *idev)
214{
215 struct net_device *dev = idev->dev;
216
217 WARN_ON(idev->ifa_list);
218 WARN_ON(idev->mc_list);
219#ifdef NET_REFCNT_DEBUG
220 pr_debug("%s: %p=%s\n", __func__, idev, dev ? dev->name : "NIL");
221#endif
222 dev_put(dev);
223 if (!idev->dead)
224 pr_err("Freeing alive in_device %p\n", idev);
225 else
226 kfree(idev);
227}
228EXPORT_SYMBOL(in_dev_finish_destroy);
229
230static struct in_device *inetdev_init(struct net_device *dev)
231{
232 struct in_device *in_dev;
233
234 ASSERT_RTNL();
235
236 in_dev = kzalloc(sizeof(*in_dev), GFP_KERNEL);
237 if (!in_dev)
238 goto out;
239 memcpy(&in_dev->cnf, dev_net(dev)->ipv4.devconf_dflt,
240 sizeof(in_dev->cnf));
241 in_dev->cnf.sysctl = NULL;
242 in_dev->dev = dev;
243 in_dev->arp_parms = neigh_parms_alloc(dev, &arp_tbl);
244 if (!in_dev->arp_parms)
245 goto out_kfree;
246 if (IPV4_DEVCONF(in_dev->cnf, FORWARDING))
247 dev_disable_lro(dev);
248 /* Reference in_dev->dev */
249 dev_hold(dev);
250 /* Account for reference dev->ip_ptr (below) */
251 in_dev_hold(in_dev);
252
253 devinet_sysctl_register(in_dev);
254 ip_mc_init_dev(in_dev);
255 if (dev->flags & IFF_UP)
256 ip_mc_up(in_dev);
257
258 /* we can receive as soon as ip_ptr is set -- do this last */
259 rcu_assign_pointer(dev->ip_ptr, in_dev);
260out:
261 return in_dev;
262out_kfree:
263 kfree(in_dev);
264 in_dev = NULL;
265 goto out;
266}
267
268static void in_dev_rcu_put(struct rcu_head *head)
269{
270 struct in_device *idev = container_of(head, struct in_device, rcu_head);
271 in_dev_put(idev);
272}
273
274static void inetdev_destroy(struct in_device *in_dev)
275{
276 struct in_ifaddr *ifa;
277 struct net_device *dev;
278
279 ASSERT_RTNL();
280
281 dev = in_dev->dev;
282
283 in_dev->dead = 1;
284
285 ip_mc_destroy_dev(in_dev);
286
287 while ((ifa = in_dev->ifa_list) != NULL) {
288 inet_del_ifa(in_dev, &in_dev->ifa_list, 0);
289 inet_free_ifa(ifa);
290 }
291
292 RCU_INIT_POINTER(dev->ip_ptr, NULL);
293
294 devinet_sysctl_unregister(in_dev);
295 neigh_parms_release(&arp_tbl, in_dev->arp_parms);
296 arp_ifdown(dev);
297
298 call_rcu(&in_dev->rcu_head, in_dev_rcu_put);
299}
300
301int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b)
302{
303 rcu_read_lock();
304 for_primary_ifa(in_dev) {
305 if (inet_ifa_match(a, ifa)) {
306 if (!b || inet_ifa_match(b, ifa)) {
307 rcu_read_unlock();
308 return 1;
309 }
310 }
311 } endfor_ifa(in_dev);
312 rcu_read_unlock();
313 return 0;
314}
315
316static void __inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
317 int destroy, struct nlmsghdr *nlh, u32 pid)
318{
319 struct in_ifaddr *promote = NULL;
320 struct in_ifaddr *ifa, *ifa1 = *ifap;
321 struct in_ifaddr *last_prim = in_dev->ifa_list;
322 struct in_ifaddr *prev_prom = NULL;
323 int do_promote = IN_DEV_PROMOTE_SECONDARIES(in_dev);
324
325 ASSERT_RTNL();
326
327 /* 1. Deleting primary ifaddr forces deletion all secondaries
328 * unless alias promotion is set
329 **/
330
331 if (!(ifa1->ifa_flags & IFA_F_SECONDARY)) {
332 struct in_ifaddr **ifap1 = &ifa1->ifa_next;
333
334 while ((ifa = *ifap1) != NULL) {
335 if (!(ifa->ifa_flags & IFA_F_SECONDARY) &&
336 ifa1->ifa_scope <= ifa->ifa_scope)
337 last_prim = ifa;
338
339 if (!(ifa->ifa_flags & IFA_F_SECONDARY) ||
340 ifa1->ifa_mask != ifa->ifa_mask ||
341 !inet_ifa_match(ifa1->ifa_address, ifa)) {
342 ifap1 = &ifa->ifa_next;
343 prev_prom = ifa;
344 continue;
345 }
346
347 if (!do_promote) {
348 inet_hash_remove(ifa);
349 *ifap1 = ifa->ifa_next;
350
351 rtmsg_ifa(RTM_DELADDR, ifa, nlh, pid);
352 blocking_notifier_call_chain(&inetaddr_chain,
353 NETDEV_DOWN, ifa);
354 inet_free_ifa(ifa);
355 } else {
356 promote = ifa;
357 break;
358 }
359 }
360 }
361
362 /* On promotion all secondaries from subnet are changing
363 * the primary IP, we must remove all their routes silently
364 * and later to add them back with new prefsrc. Do this
365 * while all addresses are on the device list.
366 */
367 for (ifa = promote; ifa; ifa = ifa->ifa_next) {
368 if (ifa1->ifa_mask == ifa->ifa_mask &&
369 inet_ifa_match(ifa1->ifa_address, ifa))
370 fib_del_ifaddr(ifa, ifa1);
371 }
372
373 /* 2. Unlink it */
374
375 *ifap = ifa1->ifa_next;
376 inet_hash_remove(ifa1);
377
378 /* 3. Announce address deletion */
379
380 /* Send message first, then call notifier.
381 At first sight, FIB update triggered by notifier
382 will refer to already deleted ifaddr, that could confuse
383 netlink listeners. It is not true: look, gated sees
384 that route deleted and if it still thinks that ifaddr
385 is valid, it will try to restore deleted routes... Grr.
386 So that, this order is correct.
387 */
388 rtmsg_ifa(RTM_DELADDR, ifa1, nlh, pid);
389 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa1);
390
391 if (promote) {
392 struct in_ifaddr *next_sec = promote->ifa_next;
393
394 if (prev_prom) {
395 prev_prom->ifa_next = promote->ifa_next;
396 promote->ifa_next = last_prim->ifa_next;
397 last_prim->ifa_next = promote;
398 }
399
400 promote->ifa_flags &= ~IFA_F_SECONDARY;
401 rtmsg_ifa(RTM_NEWADDR, promote, nlh, pid);
402 blocking_notifier_call_chain(&inetaddr_chain,
403 NETDEV_UP, promote);
404 for (ifa = next_sec; ifa; ifa = ifa->ifa_next) {
405 if (ifa1->ifa_mask != ifa->ifa_mask ||
406 !inet_ifa_match(ifa1->ifa_address, ifa))
407 continue;
408 fib_add_ifaddr(ifa);
409 }
410
411 }
412 if (destroy)
413 inet_free_ifa(ifa1);
414}
415
416static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
417 int destroy)
418{
419 __inet_del_ifa(in_dev, ifap, destroy, NULL, 0);
420}
421
422static int __inet_insert_ifa(struct in_ifaddr *ifa, struct nlmsghdr *nlh,
423 u32 pid)
424{
425 struct in_device *in_dev = ifa->ifa_dev;
426 struct in_ifaddr *ifa1, **ifap, **last_primary;
427
428 ASSERT_RTNL();
429
430 if (!ifa->ifa_local) {
431 inet_free_ifa(ifa);
432 return 0;
433 }
434
435 ifa->ifa_flags &= ~IFA_F_SECONDARY;
436 last_primary = &in_dev->ifa_list;
437
438 for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL;
439 ifap = &ifa1->ifa_next) {
440 if (!(ifa1->ifa_flags & IFA_F_SECONDARY) &&
441 ifa->ifa_scope <= ifa1->ifa_scope)
442 last_primary = &ifa1->ifa_next;
443 if (ifa1->ifa_mask == ifa->ifa_mask &&
444 inet_ifa_match(ifa1->ifa_address, ifa)) {
445 if (ifa1->ifa_local == ifa->ifa_local) {
446 inet_free_ifa(ifa);
447 return -EEXIST;
448 }
449 if (ifa1->ifa_scope != ifa->ifa_scope) {
450 inet_free_ifa(ifa);
451 return -EINVAL;
452 }
453 ifa->ifa_flags |= IFA_F_SECONDARY;
454 }
455 }
456
457 if (!(ifa->ifa_flags & IFA_F_SECONDARY)) {
458 net_srandom(ifa->ifa_local);
459 ifap = last_primary;
460 }
461
462 ifa->ifa_next = *ifap;
463 *ifap = ifa;
464
465 inet_hash_insert(dev_net(in_dev->dev), ifa);
466
467 /* Send message first, then call notifier.
468 Notifier will trigger FIB update, so that
469 listeners of netlink will know about new ifaddr */
470 rtmsg_ifa(RTM_NEWADDR, ifa, nlh, pid);
471 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa);
472
473 return 0;
474}
475
476static int inet_insert_ifa(struct in_ifaddr *ifa)
477{
478 return __inet_insert_ifa(ifa, NULL, 0);
479}
480
481static int inet_set_ifa(struct net_device *dev, struct in_ifaddr *ifa)
482{
483 struct in_device *in_dev = __in_dev_get_rtnl(dev);
484
485 ASSERT_RTNL();
486
487 if (!in_dev) {
488 inet_free_ifa(ifa);
489 return -ENOBUFS;
490 }
491 ipv4_devconf_setall(in_dev);
492 if (ifa->ifa_dev != in_dev) {
493 WARN_ON(ifa->ifa_dev);
494 in_dev_hold(in_dev);
495 ifa->ifa_dev = in_dev;
496 }
497 if (ipv4_is_loopback(ifa->ifa_local))
498 ifa->ifa_scope = RT_SCOPE_HOST;
499 return inet_insert_ifa(ifa);
500}
501
502/* Caller must hold RCU or RTNL :
503 * We dont take a reference on found in_device
504 */
505struct in_device *inetdev_by_index(struct net *net, int ifindex)
506{
507 struct net_device *dev;
508 struct in_device *in_dev = NULL;
509
510 rcu_read_lock();
511 dev = dev_get_by_index_rcu(net, ifindex);
512 if (dev)
513 in_dev = rcu_dereference_rtnl(dev->ip_ptr);
514 rcu_read_unlock();
515 return in_dev;
516}
517EXPORT_SYMBOL(inetdev_by_index);
518
519/* Called only from RTNL semaphored context. No locks. */
520
521struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix,
522 __be32 mask)
523{
524 ASSERT_RTNL();
525
526 for_primary_ifa(in_dev) {
527 if (ifa->ifa_mask == mask && inet_ifa_match(prefix, ifa))
528 return ifa;
529 } endfor_ifa(in_dev);
530 return NULL;
531}
532
533static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
534{
535 struct net *net = sock_net(skb->sk);
536 struct nlattr *tb[IFA_MAX+1];
537 struct in_device *in_dev;
538 struct ifaddrmsg *ifm;
539 struct in_ifaddr *ifa, **ifap;
540 int err = -EINVAL;
541
542 ASSERT_RTNL();
543
544 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy);
545 if (err < 0)
546 goto errout;
547
548 ifm = nlmsg_data(nlh);
549 in_dev = inetdev_by_index(net, ifm->ifa_index);
550 if (in_dev == NULL) {
551 err = -ENODEV;
552 goto errout;
553 }
554
555 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
556 ifap = &ifa->ifa_next) {
557 if (tb[IFA_LOCAL] &&
558 ifa->ifa_local != nla_get_be32(tb[IFA_LOCAL]))
559 continue;
560
561 if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label))
562 continue;
563
564 if (tb[IFA_ADDRESS] &&
565 (ifm->ifa_prefixlen != ifa->ifa_prefixlen ||
566 !inet_ifa_match(nla_get_be32(tb[IFA_ADDRESS]), ifa)))
567 continue;
568
569 __inet_del_ifa(in_dev, ifap, 1, nlh, NETLINK_CB(skb).pid);
570 return 0;
571 }
572
573 err = -EADDRNOTAVAIL;
574errout:
575 return err;
576}
577
578static struct in_ifaddr *rtm_to_ifaddr(struct net *net, struct nlmsghdr *nlh)
579{
580 struct nlattr *tb[IFA_MAX+1];
581 struct in_ifaddr *ifa;
582 struct ifaddrmsg *ifm;
583 struct net_device *dev;
584 struct in_device *in_dev;
585 int err;
586
587 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy);
588 if (err < 0)
589 goto errout;
590
591 ifm = nlmsg_data(nlh);
592 err = -EINVAL;
593 if (ifm->ifa_prefixlen > 32 || tb[IFA_LOCAL] == NULL)
594 goto errout;
595
596 dev = __dev_get_by_index(net, ifm->ifa_index);
597 err = -ENODEV;
598 if (dev == NULL)
599 goto errout;
600
601 in_dev = __in_dev_get_rtnl(dev);
602 err = -ENOBUFS;
603 if (in_dev == NULL)
604 goto errout;
605
606 ifa = inet_alloc_ifa();
607 if (ifa == NULL)
608 /*
609 * A potential indev allocation can be left alive, it stays
610 * assigned to its device and is destroy with it.
611 */
612 goto errout;
613
614 ipv4_devconf_setall(in_dev);
615 in_dev_hold(in_dev);
616
617 if (tb[IFA_ADDRESS] == NULL)
618 tb[IFA_ADDRESS] = tb[IFA_LOCAL];
619
620 INIT_HLIST_NODE(&ifa->hash);
621 ifa->ifa_prefixlen = ifm->ifa_prefixlen;
622 ifa->ifa_mask = inet_make_mask(ifm->ifa_prefixlen);
623 ifa->ifa_flags = ifm->ifa_flags;
624 ifa->ifa_scope = ifm->ifa_scope;
625 ifa->ifa_dev = in_dev;
626
627 ifa->ifa_local = nla_get_be32(tb[IFA_LOCAL]);
628 ifa->ifa_address = nla_get_be32(tb[IFA_ADDRESS]);
629
630 if (tb[IFA_BROADCAST])
631 ifa->ifa_broadcast = nla_get_be32(tb[IFA_BROADCAST]);
632
633 if (tb[IFA_LABEL])
634 nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ);
635 else
636 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
637
638 return ifa;
639
640errout:
641 return ERR_PTR(err);
642}
643
644static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
645{
646 struct net *net = sock_net(skb->sk);
647 struct in_ifaddr *ifa;
648
649 ASSERT_RTNL();
650
651 ifa = rtm_to_ifaddr(net, nlh);
652 if (IS_ERR(ifa))
653 return PTR_ERR(ifa);
654
655 return __inet_insert_ifa(ifa, nlh, NETLINK_CB(skb).pid);
656}
657
658/*
659 * Determine a default network mask, based on the IP address.
660 */
661
662static inline int inet_abc_len(__be32 addr)
663{
664 int rc = -1; /* Something else, probably a multicast. */
665
666 if (ipv4_is_zeronet(addr))
667 rc = 0;
668 else {
669 __u32 haddr = ntohl(addr);
670
671 if (IN_CLASSA(haddr))
672 rc = 8;
673 else if (IN_CLASSB(haddr))
674 rc = 16;
675 else if (IN_CLASSC(haddr))
676 rc = 24;
677 }
678
679 return rc;
680}
681
682
683int devinet_ioctl(struct net *net, unsigned int cmd, void __user *arg)
684{
685 struct ifreq ifr;
686 struct sockaddr_in sin_orig;
687 struct sockaddr_in *sin = (struct sockaddr_in *)&ifr.ifr_addr;
688 struct in_device *in_dev;
689 struct in_ifaddr **ifap = NULL;
690 struct in_ifaddr *ifa = NULL;
691 struct net_device *dev;
692 char *colon;
693 int ret = -EFAULT;
694 int tryaddrmatch = 0;
695
696 /*
697 * Fetch the caller's info block into kernel space
698 */
699
700 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
701 goto out;
702 ifr.ifr_name[IFNAMSIZ - 1] = 0;
703
704 /* save original address for comparison */
705 memcpy(&sin_orig, sin, sizeof(*sin));
706
707 colon = strchr(ifr.ifr_name, ':');
708 if (colon)
709 *colon = 0;
710
711 dev_load(net, ifr.ifr_name);
712
713 switch (cmd) {
714 case SIOCGIFADDR: /* Get interface address */
715 case SIOCGIFBRDADDR: /* Get the broadcast address */
716 case SIOCGIFDSTADDR: /* Get the destination address */
717 case SIOCGIFNETMASK: /* Get the netmask for the interface */
718 /* Note that these ioctls will not sleep,
719 so that we do not impose a lock.
720 One day we will be forced to put shlock here (I mean SMP)
721 */
722 tryaddrmatch = (sin_orig.sin_family == AF_INET);
723 memset(sin, 0, sizeof(*sin));
724 sin->sin_family = AF_INET;
725 break;
726
727 case SIOCSIFFLAGS:
728 ret = -EACCES;
729 if (!capable(CAP_NET_ADMIN))
730 goto out;
731 break;
732 case SIOCSIFADDR: /* Set interface address (and family) */
733 case SIOCSIFBRDADDR: /* Set the broadcast address */
734 case SIOCSIFDSTADDR: /* Set the destination address */
735 case SIOCSIFNETMASK: /* Set the netmask for the interface */
736 ret = -EACCES;
737 if (!capable(CAP_NET_ADMIN))
738 goto out;
739 ret = -EINVAL;
740 if (sin->sin_family != AF_INET)
741 goto out;
742 break;
743 default:
744 ret = -EINVAL;
745 goto out;
746 }
747
748 rtnl_lock();
749
750 ret = -ENODEV;
751 dev = __dev_get_by_name(net, ifr.ifr_name);
752 if (!dev)
753 goto done;
754
755 if (colon)
756 *colon = ':';
757
758 in_dev = __in_dev_get_rtnl(dev);
759 if (in_dev) {
760 if (tryaddrmatch) {
761 /* Matthias Andree */
762 /* compare label and address (4.4BSD style) */
763 /* note: we only do this for a limited set of ioctls
764 and only if the original address family was AF_INET.
765 This is checked above. */
766 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
767 ifap = &ifa->ifa_next) {
768 if (!strcmp(ifr.ifr_name, ifa->ifa_label) &&
769 sin_orig.sin_addr.s_addr ==
770 ifa->ifa_local) {
771 break; /* found */
772 }
773 }
774 }
775 /* we didn't get a match, maybe the application is
776 4.3BSD-style and passed in junk so we fall back to
777 comparing just the label */
778 if (!ifa) {
779 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
780 ifap = &ifa->ifa_next)
781 if (!strcmp(ifr.ifr_name, ifa->ifa_label))
782 break;
783 }
784 }
785
786 ret = -EADDRNOTAVAIL;
787 if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS)
788 goto done;
789
790 switch (cmd) {
791 case SIOCGIFADDR: /* Get interface address */
792 sin->sin_addr.s_addr = ifa->ifa_local;
793 goto rarok;
794
795 case SIOCGIFBRDADDR: /* Get the broadcast address */
796 sin->sin_addr.s_addr = ifa->ifa_broadcast;
797 goto rarok;
798
799 case SIOCGIFDSTADDR: /* Get the destination address */
800 sin->sin_addr.s_addr = ifa->ifa_address;
801 goto rarok;
802
803 case SIOCGIFNETMASK: /* Get the netmask for the interface */
804 sin->sin_addr.s_addr = ifa->ifa_mask;
805 goto rarok;
806
807 case SIOCSIFFLAGS:
808 if (colon) {
809 ret = -EADDRNOTAVAIL;
810 if (!ifa)
811 break;
812 ret = 0;
813 if (!(ifr.ifr_flags & IFF_UP))
814 inet_del_ifa(in_dev, ifap, 1);
815 break;
816 }
817 ret = dev_change_flags(dev, ifr.ifr_flags);
818 break;
819
820 case SIOCSIFADDR: /* Set interface address (and family) */
821 ret = -EINVAL;
822 if (inet_abc_len(sin->sin_addr.s_addr) < 0)
823 break;
824
825 if (!ifa) {
826 ret = -ENOBUFS;
827 ifa = inet_alloc_ifa();
828 INIT_HLIST_NODE(&ifa->hash);
829 if (!ifa)
830 break;
831 if (colon)
832 memcpy(ifa->ifa_label, ifr.ifr_name, IFNAMSIZ);
833 else
834 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
835 } else {
836 ret = 0;
837 if (ifa->ifa_local == sin->sin_addr.s_addr)
838 break;
839 inet_del_ifa(in_dev, ifap, 0);
840 ifa->ifa_broadcast = 0;
841 ifa->ifa_scope = 0;
842 }
843
844 ifa->ifa_address = ifa->ifa_local = sin->sin_addr.s_addr;
845
846 if (!(dev->flags & IFF_POINTOPOINT)) {
847 ifa->ifa_prefixlen = inet_abc_len(ifa->ifa_address);
848 ifa->ifa_mask = inet_make_mask(ifa->ifa_prefixlen);
849 if ((dev->flags & IFF_BROADCAST) &&
850 ifa->ifa_prefixlen < 31)
851 ifa->ifa_broadcast = ifa->ifa_address |
852 ~ifa->ifa_mask;
853 } else {
854 ifa->ifa_prefixlen = 32;
855 ifa->ifa_mask = inet_make_mask(32);
856 }
857 ret = inet_set_ifa(dev, ifa);
858 break;
859
860 case SIOCSIFBRDADDR: /* Set the broadcast address */
861 ret = 0;
862 if (ifa->ifa_broadcast != sin->sin_addr.s_addr) {
863 inet_del_ifa(in_dev, ifap, 0);
864 ifa->ifa_broadcast = sin->sin_addr.s_addr;
865 inet_insert_ifa(ifa);
866 }
867 break;
868
869 case SIOCSIFDSTADDR: /* Set the destination address */
870 ret = 0;
871 if (ifa->ifa_address == sin->sin_addr.s_addr)
872 break;
873 ret = -EINVAL;
874 if (inet_abc_len(sin->sin_addr.s_addr) < 0)
875 break;
876 ret = 0;
877 inet_del_ifa(in_dev, ifap, 0);
878 ifa->ifa_address = sin->sin_addr.s_addr;
879 inet_insert_ifa(ifa);
880 break;
881
882 case SIOCSIFNETMASK: /* Set the netmask for the interface */
883
884 /*
885 * The mask we set must be legal.
886 */
887 ret = -EINVAL;
888 if (bad_mask(sin->sin_addr.s_addr, 0))
889 break;
890 ret = 0;
891 if (ifa->ifa_mask != sin->sin_addr.s_addr) {
892 __be32 old_mask = ifa->ifa_mask;
893 inet_del_ifa(in_dev, ifap, 0);
894 ifa->ifa_mask = sin->sin_addr.s_addr;
895 ifa->ifa_prefixlen = inet_mask_len(ifa->ifa_mask);
896
897 /* See if current broadcast address matches
898 * with current netmask, then recalculate
899 * the broadcast address. Otherwise it's a
900 * funny address, so don't touch it since
901 * the user seems to know what (s)he's doing...
902 */
903 if ((dev->flags & IFF_BROADCAST) &&
904 (ifa->ifa_prefixlen < 31) &&
905 (ifa->ifa_broadcast ==
906 (ifa->ifa_local|~old_mask))) {
907 ifa->ifa_broadcast = (ifa->ifa_local |
908 ~sin->sin_addr.s_addr);
909 }
910 inet_insert_ifa(ifa);
911 }
912 break;
913 }
914done:
915 rtnl_unlock();
916out:
917 return ret;
918rarok:
919 rtnl_unlock();
920 ret = copy_to_user(arg, &ifr, sizeof(struct ifreq)) ? -EFAULT : 0;
921 goto out;
922}
923
924static int inet_gifconf(struct net_device *dev, char __user *buf, int len)
925{
926 struct in_device *in_dev = __in_dev_get_rtnl(dev);
927 struct in_ifaddr *ifa;
928 struct ifreq ifr;
929 int done = 0;
930
931 if (!in_dev)
932 goto out;
933
934 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
935 if (!buf) {
936 done += sizeof(ifr);
937 continue;
938 }
939 if (len < (int) sizeof(ifr))
940 break;
941 memset(&ifr, 0, sizeof(struct ifreq));
942 if (ifa->ifa_label)
943 strcpy(ifr.ifr_name, ifa->ifa_label);
944 else
945 strcpy(ifr.ifr_name, dev->name);
946
947 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_family = AF_INET;
948 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_addr.s_addr =
949 ifa->ifa_local;
950
951 if (copy_to_user(buf, &ifr, sizeof(struct ifreq))) {
952 done = -EFAULT;
953 break;
954 }
955 buf += sizeof(struct ifreq);
956 len -= sizeof(struct ifreq);
957 done += sizeof(struct ifreq);
958 }
959out:
960 return done;
961}
962
963__be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope)
964{
965 __be32 addr = 0;
966 struct in_device *in_dev;
967 struct net *net = dev_net(dev);
968
969 rcu_read_lock();
970 in_dev = __in_dev_get_rcu(dev);
971 if (!in_dev)
972 goto no_in_dev;
973
974 for_primary_ifa(in_dev) {
975 if (ifa->ifa_scope > scope)
976 continue;
977 if (!dst || inet_ifa_match(dst, ifa)) {
978 addr = ifa->ifa_local;
979 break;
980 }
981 if (!addr)
982 addr = ifa->ifa_local;
983 } endfor_ifa(in_dev);
984
985 if (addr)
986 goto out_unlock;
987no_in_dev:
988
989 /* Not loopback addresses on loopback should be preferred
990 in this case. It is importnat that lo is the first interface
991 in dev_base list.
992 */
993 for_each_netdev_rcu(net, dev) {
994 in_dev = __in_dev_get_rcu(dev);
995 if (!in_dev)
996 continue;
997
998 for_primary_ifa(in_dev) {
999 if (ifa->ifa_scope != RT_SCOPE_LINK &&
1000 ifa->ifa_scope <= scope) {
1001 addr = ifa->ifa_local;
1002 goto out_unlock;
1003 }
1004 } endfor_ifa(in_dev);
1005 }
1006out_unlock:
1007 rcu_read_unlock();
1008 return addr;
1009}
1010EXPORT_SYMBOL(inet_select_addr);
1011
1012static __be32 confirm_addr_indev(struct in_device *in_dev, __be32 dst,
1013 __be32 local, int scope)
1014{
1015 int same = 0;
1016 __be32 addr = 0;
1017
1018 for_ifa(in_dev) {
1019 if (!addr &&
1020 (local == ifa->ifa_local || !local) &&
1021 ifa->ifa_scope <= scope) {
1022 addr = ifa->ifa_local;
1023 if (same)
1024 break;
1025 }
1026 if (!same) {
1027 same = (!local || inet_ifa_match(local, ifa)) &&
1028 (!dst || inet_ifa_match(dst, ifa));
1029 if (same && addr) {
1030 if (local || !dst)
1031 break;
1032 /* Is the selected addr into dst subnet? */
1033 if (inet_ifa_match(addr, ifa))
1034 break;
1035 /* No, then can we use new local src? */
1036 if (ifa->ifa_scope <= scope) {
1037 addr = ifa->ifa_local;
1038 break;
1039 }
1040 /* search for large dst subnet for addr */
1041 same = 0;
1042 }
1043 }
1044 } endfor_ifa(in_dev);
1045
1046 return same ? addr : 0;
1047}
1048
1049/*
1050 * Confirm that local IP address exists using wildcards:
1051 * - in_dev: only on this interface, 0=any interface
1052 * - dst: only in the same subnet as dst, 0=any dst
1053 * - local: address, 0=autoselect the local address
1054 * - scope: maximum allowed scope value for the local address
1055 */
1056__be32 inet_confirm_addr(struct in_device *in_dev,
1057 __be32 dst, __be32 local, int scope)
1058{
1059 __be32 addr = 0;
1060 struct net_device *dev;
1061 struct net *net;
1062
1063 if (scope != RT_SCOPE_LINK)
1064 return confirm_addr_indev(in_dev, dst, local, scope);
1065
1066 net = dev_net(in_dev->dev);
1067 rcu_read_lock();
1068 for_each_netdev_rcu(net, dev) {
1069 in_dev = __in_dev_get_rcu(dev);
1070 if (in_dev) {
1071 addr = confirm_addr_indev(in_dev, dst, local, scope);
1072 if (addr)
1073 break;
1074 }
1075 }
1076 rcu_read_unlock();
1077
1078 return addr;
1079}
1080EXPORT_SYMBOL(inet_confirm_addr);
1081
1082/*
1083 * Device notifier
1084 */
1085
1086int register_inetaddr_notifier(struct notifier_block *nb)
1087{
1088 return blocking_notifier_chain_register(&inetaddr_chain, nb);
1089}
1090EXPORT_SYMBOL(register_inetaddr_notifier);
1091
1092int unregister_inetaddr_notifier(struct notifier_block *nb)
1093{
1094 return blocking_notifier_chain_unregister(&inetaddr_chain, nb);
1095}
1096EXPORT_SYMBOL(unregister_inetaddr_notifier);
1097
1098/* Rename ifa_labels for a device name change. Make some effort to preserve
1099 * existing alias numbering and to create unique labels if possible.
1100*/
1101static void inetdev_changename(struct net_device *dev, struct in_device *in_dev)
1102{
1103 struct in_ifaddr *ifa;
1104 int named = 0;
1105
1106 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1107 char old[IFNAMSIZ], *dot;
1108
1109 memcpy(old, ifa->ifa_label, IFNAMSIZ);
1110 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1111 if (named++ == 0)
1112 goto skip;
1113 dot = strchr(old, ':');
1114 if (dot == NULL) {
1115 sprintf(old, ":%d", named);
1116 dot = old;
1117 }
1118 if (strlen(dot) + strlen(dev->name) < IFNAMSIZ)
1119 strcat(ifa->ifa_label, dot);
1120 else
1121 strcpy(ifa->ifa_label + (IFNAMSIZ - strlen(dot) - 1), dot);
1122skip:
1123 rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0);
1124 }
1125}
1126
1127static inline bool inetdev_valid_mtu(unsigned int mtu)
1128{
1129 return mtu >= 68;
1130}
1131
1132static void inetdev_send_gratuitous_arp(struct net_device *dev,
1133 struct in_device *in_dev)
1134
1135{
1136 struct in_ifaddr *ifa;
1137
1138 for (ifa = in_dev->ifa_list; ifa;
1139 ifa = ifa->ifa_next) {
1140 arp_send(ARPOP_REQUEST, ETH_P_ARP,
1141 ifa->ifa_local, dev,
1142 ifa->ifa_local, NULL,
1143 dev->dev_addr, NULL);
1144 }
1145}
1146
1147/* Called only under RTNL semaphore */
1148
1149static int inetdev_event(struct notifier_block *this, unsigned long event,
1150 void *ptr)
1151{
1152 struct net_device *dev = ptr;
1153 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1154
1155 ASSERT_RTNL();
1156
1157 if (!in_dev) {
1158 if (event == NETDEV_REGISTER) {
1159 in_dev = inetdev_init(dev);
1160 if (!in_dev)
1161 return notifier_from_errno(-ENOMEM);
1162 if (dev->flags & IFF_LOOPBACK) {
1163 IN_DEV_CONF_SET(in_dev, NOXFRM, 1);
1164 IN_DEV_CONF_SET(in_dev, NOPOLICY, 1);
1165 }
1166 } else if (event == NETDEV_CHANGEMTU) {
1167 /* Re-enabling IP */
1168 if (inetdev_valid_mtu(dev->mtu))
1169 in_dev = inetdev_init(dev);
1170 }
1171 goto out;
1172 }
1173
1174 switch (event) {
1175 case NETDEV_REGISTER:
1176 pr_debug("%s: bug\n", __func__);
1177 RCU_INIT_POINTER(dev->ip_ptr, NULL);
1178 break;
1179 case NETDEV_UP:
1180 if (!inetdev_valid_mtu(dev->mtu))
1181 break;
1182 if (dev->flags & IFF_LOOPBACK) {
1183 struct in_ifaddr *ifa = inet_alloc_ifa();
1184
1185 if (ifa) {
1186 INIT_HLIST_NODE(&ifa->hash);
1187 ifa->ifa_local =
1188 ifa->ifa_address = htonl(INADDR_LOOPBACK);
1189 ifa->ifa_prefixlen = 8;
1190 ifa->ifa_mask = inet_make_mask(8);
1191 in_dev_hold(in_dev);
1192 ifa->ifa_dev = in_dev;
1193 ifa->ifa_scope = RT_SCOPE_HOST;
1194 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1195 inet_insert_ifa(ifa);
1196 }
1197 }
1198 ip_mc_up(in_dev);
1199 /* fall through */
1200 case NETDEV_CHANGEADDR:
1201 if (!IN_DEV_ARP_NOTIFY(in_dev))
1202 break;
1203 /* fall through */
1204 case NETDEV_NOTIFY_PEERS:
1205 /* Send gratuitous ARP to notify of link change */
1206 inetdev_send_gratuitous_arp(dev, in_dev);
1207 break;
1208 case NETDEV_DOWN:
1209 ip_mc_down(in_dev);
1210 break;
1211 case NETDEV_PRE_TYPE_CHANGE:
1212 ip_mc_unmap(in_dev);
1213 break;
1214 case NETDEV_POST_TYPE_CHANGE:
1215 ip_mc_remap(in_dev);
1216 break;
1217 case NETDEV_CHANGEMTU:
1218 if (inetdev_valid_mtu(dev->mtu))
1219 break;
1220 /* disable IP when MTU is not enough */
1221 case NETDEV_UNREGISTER:
1222 inetdev_destroy(in_dev);
1223 break;
1224 case NETDEV_CHANGENAME:
1225 /* Do not notify about label change, this event is
1226 * not interesting to applications using netlink.
1227 */
1228 inetdev_changename(dev, in_dev);
1229
1230 devinet_sysctl_unregister(in_dev);
1231 devinet_sysctl_register(in_dev);
1232 break;
1233 }
1234out:
1235 return NOTIFY_DONE;
1236}
1237
1238static struct notifier_block ip_netdev_notifier = {
1239 .notifier_call = inetdev_event,
1240};
1241
1242static inline size_t inet_nlmsg_size(void)
1243{
1244 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
1245 + nla_total_size(4) /* IFA_ADDRESS */
1246 + nla_total_size(4) /* IFA_LOCAL */
1247 + nla_total_size(4) /* IFA_BROADCAST */
1248 + nla_total_size(IFNAMSIZ); /* IFA_LABEL */
1249}
1250
1251static int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa,
1252 u32 pid, u32 seq, int event, unsigned int flags)
1253{
1254 struct ifaddrmsg *ifm;
1255 struct nlmsghdr *nlh;
1256
1257 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*ifm), flags);
1258 if (nlh == NULL)
1259 return -EMSGSIZE;
1260
1261 ifm = nlmsg_data(nlh);
1262 ifm->ifa_family = AF_INET;
1263 ifm->ifa_prefixlen = ifa->ifa_prefixlen;
1264 ifm->ifa_flags = ifa->ifa_flags|IFA_F_PERMANENT;
1265 ifm->ifa_scope = ifa->ifa_scope;
1266 ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
1267
1268 if ((ifa->ifa_address &&
1269 nla_put_be32(skb, IFA_ADDRESS, ifa->ifa_address)) ||
1270 (ifa->ifa_local &&
1271 nla_put_be32(skb, IFA_LOCAL, ifa->ifa_local)) ||
1272 (ifa->ifa_broadcast &&
1273 nla_put_be32(skb, IFA_BROADCAST, ifa->ifa_broadcast)) ||
1274 (ifa->ifa_label[0] &&
1275 nla_put_string(skb, IFA_LABEL, ifa->ifa_label)))
1276 goto nla_put_failure;
1277
1278 return nlmsg_end(skb, nlh);
1279
1280nla_put_failure:
1281 nlmsg_cancel(skb, nlh);
1282 return -EMSGSIZE;
1283}
1284
1285static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
1286{
1287 struct net *net = sock_net(skb->sk);
1288 int h, s_h;
1289 int idx, s_idx;
1290 int ip_idx, s_ip_idx;
1291 struct net_device *dev;
1292 struct in_device *in_dev;
1293 struct in_ifaddr *ifa;
1294 struct hlist_head *head;
1295 struct hlist_node *node;
1296
1297 s_h = cb->args[0];
1298 s_idx = idx = cb->args[1];
1299 s_ip_idx = ip_idx = cb->args[2];
1300
1301 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1302 idx = 0;
1303 head = &net->dev_index_head[h];
1304 rcu_read_lock();
1305 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
1306 if (idx < s_idx)
1307 goto cont;
1308 if (h > s_h || idx > s_idx)
1309 s_ip_idx = 0;
1310 in_dev = __in_dev_get_rcu(dev);
1311 if (!in_dev)
1312 goto cont;
1313
1314 for (ifa = in_dev->ifa_list, ip_idx = 0; ifa;
1315 ifa = ifa->ifa_next, ip_idx++) {
1316 if (ip_idx < s_ip_idx)
1317 continue;
1318 if (inet_fill_ifaddr(skb, ifa,
1319 NETLINK_CB(cb->skb).pid,
1320 cb->nlh->nlmsg_seq,
1321 RTM_NEWADDR, NLM_F_MULTI) <= 0) {
1322 rcu_read_unlock();
1323 goto done;
1324 }
1325 }
1326cont:
1327 idx++;
1328 }
1329 rcu_read_unlock();
1330 }
1331
1332done:
1333 cb->args[0] = h;
1334 cb->args[1] = idx;
1335 cb->args[2] = ip_idx;
1336
1337 return skb->len;
1338}
1339
1340static void rtmsg_ifa(int event, struct in_ifaddr *ifa, struct nlmsghdr *nlh,
1341 u32 pid)
1342{
1343 struct sk_buff *skb;
1344 u32 seq = nlh ? nlh->nlmsg_seq : 0;
1345 int err = -ENOBUFS;
1346 struct net *net;
1347
1348 net = dev_net(ifa->ifa_dev->dev);
1349 skb = nlmsg_new(inet_nlmsg_size(), GFP_KERNEL);
1350 if (skb == NULL)
1351 goto errout;
1352
1353 err = inet_fill_ifaddr(skb, ifa, pid, seq, event, 0);
1354 if (err < 0) {
1355 /* -EMSGSIZE implies BUG in inet_nlmsg_size() */
1356 WARN_ON(err == -EMSGSIZE);
1357 kfree_skb(skb);
1358 goto errout;
1359 }
1360 rtnl_notify(skb, net, pid, RTNLGRP_IPV4_IFADDR, nlh, GFP_KERNEL);
1361 return;
1362errout:
1363 if (err < 0)
1364 rtnl_set_sk_err(net, RTNLGRP_IPV4_IFADDR, err);
1365}
1366
1367static size_t inet_get_link_af_size(const struct net_device *dev)
1368{
1369 struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr);
1370
1371 if (!in_dev)
1372 return 0;
1373
1374 return nla_total_size(IPV4_DEVCONF_MAX * 4); /* IFLA_INET_CONF */
1375}
1376
1377static int inet_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
1378{
1379 struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr);
1380 struct nlattr *nla;
1381 int i;
1382
1383 if (!in_dev)
1384 return -ENODATA;
1385
1386 nla = nla_reserve(skb, IFLA_INET_CONF, IPV4_DEVCONF_MAX * 4);
1387 if (nla == NULL)
1388 return -EMSGSIZE;
1389
1390 for (i = 0; i < IPV4_DEVCONF_MAX; i++)
1391 ((u32 *) nla_data(nla))[i] = in_dev->cnf.data[i];
1392
1393 return 0;
1394}
1395
1396static const struct nla_policy inet_af_policy[IFLA_INET_MAX+1] = {
1397 [IFLA_INET_CONF] = { .type = NLA_NESTED },
1398};
1399
1400static int inet_validate_link_af(const struct net_device *dev,
1401 const struct nlattr *nla)
1402{
1403 struct nlattr *a, *tb[IFLA_INET_MAX+1];
1404 int err, rem;
1405
1406 if (dev && !__in_dev_get_rtnl(dev))
1407 return -EAFNOSUPPORT;
1408
1409 err = nla_parse_nested(tb, IFLA_INET_MAX, nla, inet_af_policy);
1410 if (err < 0)
1411 return err;
1412
1413 if (tb[IFLA_INET_CONF]) {
1414 nla_for_each_nested(a, tb[IFLA_INET_CONF], rem) {
1415 int cfgid = nla_type(a);
1416
1417 if (nla_len(a) < 4)
1418 return -EINVAL;
1419
1420 if (cfgid <= 0 || cfgid > IPV4_DEVCONF_MAX)
1421 return -EINVAL;
1422 }
1423 }
1424
1425 return 0;
1426}
1427
1428static int inet_set_link_af(struct net_device *dev, const struct nlattr *nla)
1429{
1430 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1431 struct nlattr *a, *tb[IFLA_INET_MAX+1];
1432 int rem;
1433
1434 if (!in_dev)
1435 return -EAFNOSUPPORT;
1436
1437 if (nla_parse_nested(tb, IFLA_INET_MAX, nla, NULL) < 0)
1438 BUG();
1439
1440 if (tb[IFLA_INET_CONF]) {
1441 nla_for_each_nested(a, tb[IFLA_INET_CONF], rem)
1442 ipv4_devconf_set(in_dev, nla_type(a), nla_get_u32(a));
1443 }
1444
1445 return 0;
1446}
1447
1448#ifdef CONFIG_SYSCTL
1449
1450static void devinet_copy_dflt_conf(struct net *net, int i)
1451{
1452 struct net_device *dev;
1453
1454 rcu_read_lock();
1455 for_each_netdev_rcu(net, dev) {
1456 struct in_device *in_dev;
1457
1458 in_dev = __in_dev_get_rcu(dev);
1459 if (in_dev && !test_bit(i, in_dev->cnf.state))
1460 in_dev->cnf.data[i] = net->ipv4.devconf_dflt->data[i];
1461 }
1462 rcu_read_unlock();
1463}
1464
1465/* called with RTNL locked */
1466static void inet_forward_change(struct net *net)
1467{
1468 struct net_device *dev;
1469 int on = IPV4_DEVCONF_ALL(net, FORWARDING);
1470
1471 IPV4_DEVCONF_ALL(net, ACCEPT_REDIRECTS) = !on;
1472 IPV4_DEVCONF_DFLT(net, FORWARDING) = on;
1473
1474 for_each_netdev(net, dev) {
1475 struct in_device *in_dev;
1476 if (on)
1477 dev_disable_lro(dev);
1478 rcu_read_lock();
1479 in_dev = __in_dev_get_rcu(dev);
1480 if (in_dev)
1481 IN_DEV_CONF_SET(in_dev, FORWARDING, on);
1482 rcu_read_unlock();
1483 }
1484}
1485
1486static int devinet_conf_proc(ctl_table *ctl, int write,
1487 void __user *buffer,
1488 size_t *lenp, loff_t *ppos)
1489{
1490 int old_value = *(int *)ctl->data;
1491 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
1492 int new_value = *(int *)ctl->data;
1493
1494 if (write) {
1495 struct ipv4_devconf *cnf = ctl->extra1;
1496 struct net *net = ctl->extra2;
1497 int i = (int *)ctl->data - cnf->data;
1498
1499 set_bit(i, cnf->state);
1500
1501 if (cnf == net->ipv4.devconf_dflt)
1502 devinet_copy_dflt_conf(net, i);
1503 if (i == IPV4_DEVCONF_ACCEPT_LOCAL - 1)
1504 if ((new_value == 0) && (old_value != 0))
1505 rt_cache_flush(net, 0);
1506 }
1507
1508 return ret;
1509}
1510
1511static int devinet_sysctl_forward(ctl_table *ctl, int write,
1512 void __user *buffer,
1513 size_t *lenp, loff_t *ppos)
1514{
1515 int *valp = ctl->data;
1516 int val = *valp;
1517 loff_t pos = *ppos;
1518 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
1519
1520 if (write && *valp != val) {
1521 struct net *net = ctl->extra2;
1522
1523 if (valp != &IPV4_DEVCONF_DFLT(net, FORWARDING)) {
1524 if (!rtnl_trylock()) {
1525 /* Restore the original values before restarting */
1526 *valp = val;
1527 *ppos = pos;
1528 return restart_syscall();
1529 }
1530 if (valp == &IPV4_DEVCONF_ALL(net, FORWARDING)) {
1531 inet_forward_change(net);
1532 } else if (*valp) {
1533 struct ipv4_devconf *cnf = ctl->extra1;
1534 struct in_device *idev =
1535 container_of(cnf, struct in_device, cnf);
1536 dev_disable_lro(idev->dev);
1537 }
1538 rtnl_unlock();
1539 rt_cache_flush(net, 0);
1540 }
1541 }
1542
1543 return ret;
1544}
1545
1546static int ipv4_doint_and_flush(ctl_table *ctl, int write,
1547 void __user *buffer,
1548 size_t *lenp, loff_t *ppos)
1549{
1550 int *valp = ctl->data;
1551 int val = *valp;
1552 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
1553 struct net *net = ctl->extra2;
1554
1555 if (write && *valp != val)
1556 rt_cache_flush(net, 0);
1557
1558 return ret;
1559}
1560
1561#define DEVINET_SYSCTL_ENTRY(attr, name, mval, proc) \
1562 { \
1563 .procname = name, \
1564 .data = ipv4_devconf.data + \
1565 IPV4_DEVCONF_ ## attr - 1, \
1566 .maxlen = sizeof(int), \
1567 .mode = mval, \
1568 .proc_handler = proc, \
1569 .extra1 = &ipv4_devconf, \
1570 }
1571
1572#define DEVINET_SYSCTL_RW_ENTRY(attr, name) \
1573 DEVINET_SYSCTL_ENTRY(attr, name, 0644, devinet_conf_proc)
1574
1575#define DEVINET_SYSCTL_RO_ENTRY(attr, name) \
1576 DEVINET_SYSCTL_ENTRY(attr, name, 0444, devinet_conf_proc)
1577
1578#define DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, proc) \
1579 DEVINET_SYSCTL_ENTRY(attr, name, 0644, proc)
1580
1581#define DEVINET_SYSCTL_FLUSHING_ENTRY(attr, name) \
1582 DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, ipv4_doint_and_flush)
1583
1584static struct devinet_sysctl_table {
1585 struct ctl_table_header *sysctl_header;
1586 struct ctl_table devinet_vars[__IPV4_DEVCONF_MAX];
1587} devinet_sysctl = {
1588 .devinet_vars = {
1589 DEVINET_SYSCTL_COMPLEX_ENTRY(FORWARDING, "forwarding",
1590 devinet_sysctl_forward),
1591 DEVINET_SYSCTL_RO_ENTRY(MC_FORWARDING, "mc_forwarding"),
1592
1593 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_REDIRECTS, "accept_redirects"),
1594 DEVINET_SYSCTL_RW_ENTRY(SECURE_REDIRECTS, "secure_redirects"),
1595 DEVINET_SYSCTL_RW_ENTRY(SHARED_MEDIA, "shared_media"),
1596 DEVINET_SYSCTL_RW_ENTRY(RP_FILTER, "rp_filter"),
1597 DEVINET_SYSCTL_RW_ENTRY(SEND_REDIRECTS, "send_redirects"),
1598 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_SOURCE_ROUTE,
1599 "accept_source_route"),
1600 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_LOCAL, "accept_local"),
1601 DEVINET_SYSCTL_RW_ENTRY(SRC_VMARK, "src_valid_mark"),
1602 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP, "proxy_arp"),
1603 DEVINET_SYSCTL_RW_ENTRY(MEDIUM_ID, "medium_id"),
1604 DEVINET_SYSCTL_RW_ENTRY(BOOTP_RELAY, "bootp_relay"),
1605 DEVINET_SYSCTL_RW_ENTRY(LOG_MARTIANS, "log_martians"),
1606 DEVINET_SYSCTL_RW_ENTRY(TAG, "tag"),
1607 DEVINET_SYSCTL_RW_ENTRY(ARPFILTER, "arp_filter"),
1608 DEVINET_SYSCTL_RW_ENTRY(ARP_ANNOUNCE, "arp_announce"),
1609 DEVINET_SYSCTL_RW_ENTRY(ARP_IGNORE, "arp_ignore"),
1610 DEVINET_SYSCTL_RW_ENTRY(ARP_ACCEPT, "arp_accept"),
1611 DEVINET_SYSCTL_RW_ENTRY(ARP_NOTIFY, "arp_notify"),
1612 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP_PVLAN, "proxy_arp_pvlan"),
1613
1614 DEVINET_SYSCTL_FLUSHING_ENTRY(NOXFRM, "disable_xfrm"),
1615 DEVINET_SYSCTL_FLUSHING_ENTRY(NOPOLICY, "disable_policy"),
1616 DEVINET_SYSCTL_FLUSHING_ENTRY(FORCE_IGMP_VERSION,
1617 "force_igmp_version"),
1618 DEVINET_SYSCTL_FLUSHING_ENTRY(PROMOTE_SECONDARIES,
1619 "promote_secondaries"),
1620 },
1621};
1622
1623static int __devinet_sysctl_register(struct net *net, char *dev_name,
1624 struct ipv4_devconf *p)
1625{
1626 int i;
1627 struct devinet_sysctl_table *t;
1628 char path[sizeof("net/ipv4/conf/") + IFNAMSIZ];
1629
1630 t = kmemdup(&devinet_sysctl, sizeof(*t), GFP_KERNEL);
1631 if (!t)
1632 goto out;
1633
1634 for (i = 0; i < ARRAY_SIZE(t->devinet_vars) - 1; i++) {
1635 t->devinet_vars[i].data += (char *)p - (char *)&ipv4_devconf;
1636 t->devinet_vars[i].extra1 = p;
1637 t->devinet_vars[i].extra2 = net;
1638 }
1639
1640 snprintf(path, sizeof(path), "net/ipv4/conf/%s", dev_name);
1641
1642 t->sysctl_header = register_net_sysctl(net, path, t->devinet_vars);
1643 if (!t->sysctl_header)
1644 goto free;
1645
1646 p->sysctl = t;
1647 return 0;
1648
1649free:
1650 kfree(t);
1651out:
1652 return -ENOBUFS;
1653}
1654
1655static void __devinet_sysctl_unregister(struct ipv4_devconf *cnf)
1656{
1657 struct devinet_sysctl_table *t = cnf->sysctl;
1658
1659 if (t == NULL)
1660 return;
1661
1662 cnf->sysctl = NULL;
1663 unregister_net_sysctl_table(t->sysctl_header);
1664 kfree(t);
1665}
1666
1667static void devinet_sysctl_register(struct in_device *idev)
1668{
1669 neigh_sysctl_register(idev->dev, idev->arp_parms, "ipv4", NULL);
1670 __devinet_sysctl_register(dev_net(idev->dev), idev->dev->name,
1671 &idev->cnf);
1672}
1673
1674static void devinet_sysctl_unregister(struct in_device *idev)
1675{
1676 __devinet_sysctl_unregister(&idev->cnf);
1677 neigh_sysctl_unregister(idev->arp_parms);
1678}
1679
1680static struct ctl_table ctl_forward_entry[] = {
1681 {
1682 .procname = "ip_forward",
1683 .data = &ipv4_devconf.data[
1684 IPV4_DEVCONF_FORWARDING - 1],
1685 .maxlen = sizeof(int),
1686 .mode = 0644,
1687 .proc_handler = devinet_sysctl_forward,
1688 .extra1 = &ipv4_devconf,
1689 .extra2 = &init_net,
1690 },
1691 { },
1692};
1693#endif
1694
1695static __net_init int devinet_init_net(struct net *net)
1696{
1697 int err;
1698 struct ipv4_devconf *all, *dflt;
1699#ifdef CONFIG_SYSCTL
1700 struct ctl_table *tbl = ctl_forward_entry;
1701 struct ctl_table_header *forw_hdr;
1702#endif
1703
1704 err = -ENOMEM;
1705 all = &ipv4_devconf;
1706 dflt = &ipv4_devconf_dflt;
1707
1708 if (!net_eq(net, &init_net)) {
1709 all = kmemdup(all, sizeof(ipv4_devconf), GFP_KERNEL);
1710 if (all == NULL)
1711 goto err_alloc_all;
1712
1713 dflt = kmemdup(dflt, sizeof(ipv4_devconf_dflt), GFP_KERNEL);
1714 if (dflt == NULL)
1715 goto err_alloc_dflt;
1716
1717#ifdef CONFIG_SYSCTL
1718 tbl = kmemdup(tbl, sizeof(ctl_forward_entry), GFP_KERNEL);
1719 if (tbl == NULL)
1720 goto err_alloc_ctl;
1721
1722 tbl[0].data = &all->data[IPV4_DEVCONF_FORWARDING - 1];
1723 tbl[0].extra1 = all;
1724 tbl[0].extra2 = net;
1725#endif
1726 }
1727
1728#ifdef CONFIG_SYSCTL
1729 err = __devinet_sysctl_register(net, "all", all);
1730 if (err < 0)
1731 goto err_reg_all;
1732
1733 err = __devinet_sysctl_register(net, "default", dflt);
1734 if (err < 0)
1735 goto err_reg_dflt;
1736
1737 err = -ENOMEM;
1738 forw_hdr = register_net_sysctl(net, "net/ipv4", tbl);
1739 if (forw_hdr == NULL)
1740 goto err_reg_ctl;
1741 net->ipv4.forw_hdr = forw_hdr;
1742#endif
1743
1744 net->ipv4.devconf_all = all;
1745 net->ipv4.devconf_dflt = dflt;
1746 return 0;
1747
1748#ifdef CONFIG_SYSCTL
1749err_reg_ctl:
1750 __devinet_sysctl_unregister(dflt);
1751err_reg_dflt:
1752 __devinet_sysctl_unregister(all);
1753err_reg_all:
1754 if (tbl != ctl_forward_entry)
1755 kfree(tbl);
1756err_alloc_ctl:
1757#endif
1758 if (dflt != &ipv4_devconf_dflt)
1759 kfree(dflt);
1760err_alloc_dflt:
1761 if (all != &ipv4_devconf)
1762 kfree(all);
1763err_alloc_all:
1764 return err;
1765}
1766
1767static __net_exit void devinet_exit_net(struct net *net)
1768{
1769#ifdef CONFIG_SYSCTL
1770 struct ctl_table *tbl;
1771
1772 tbl = net->ipv4.forw_hdr->ctl_table_arg;
1773 unregister_net_sysctl_table(net->ipv4.forw_hdr);
1774 __devinet_sysctl_unregister(net->ipv4.devconf_dflt);
1775 __devinet_sysctl_unregister(net->ipv4.devconf_all);
1776 kfree(tbl);
1777#endif
1778 kfree(net->ipv4.devconf_dflt);
1779 kfree(net->ipv4.devconf_all);
1780}
1781
1782static __net_initdata struct pernet_operations devinet_ops = {
1783 .init = devinet_init_net,
1784 .exit = devinet_exit_net,
1785};
1786
1787static struct rtnl_af_ops inet_af_ops = {
1788 .family = AF_INET,
1789 .fill_link_af = inet_fill_link_af,
1790 .get_link_af_size = inet_get_link_af_size,
1791 .validate_link_af = inet_validate_link_af,
1792 .set_link_af = inet_set_link_af,
1793};
1794
1795void __init devinet_init(void)
1796{
1797 int i;
1798
1799 for (i = 0; i < IN4_ADDR_HSIZE; i++)
1800 INIT_HLIST_HEAD(&inet_addr_lst[i]);
1801
1802 register_pernet_subsys(&devinet_ops);
1803
1804 register_gifconf(PF_INET, inet_gifconf);
1805 register_netdevice_notifier(&ip_netdev_notifier);
1806
1807 rtnl_af_register(&inet_af_ops);
1808
1809 rtnl_register(PF_INET, RTM_NEWADDR, inet_rtm_newaddr, NULL, NULL);
1810 rtnl_register(PF_INET, RTM_DELADDR, inet_rtm_deladdr, NULL, NULL);
1811 rtnl_register(PF_INET, RTM_GETADDR, NULL, inet_dump_ifaddr, NULL);
1812}
1813
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * NET3 IP device support routines.
4 *
5 * Derived from the IP parts of dev.c 1.0.19
6 * Authors: Ross Biro
7 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
8 * Mark Evans, <evansmp@uhura.aston.ac.uk>
9 *
10 * Additional Authors:
11 * Alan Cox, <gw4pts@gw4pts.ampr.org>
12 * Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
13 *
14 * Changes:
15 * Alexey Kuznetsov: pa_* fields are replaced with ifaddr
16 * lists.
17 * Cyrus Durgin: updated for kmod
18 * Matthias Andree: in devinet_ioctl, compare label and
19 * address (4.4BSD alias style support),
20 * fall back to comparing just the label
21 * if no match found.
22 */
23
24
25#include <linux/uaccess.h>
26#include <linux/bitops.h>
27#include <linux/capability.h>
28#include <linux/module.h>
29#include <linux/types.h>
30#include <linux/kernel.h>
31#include <linux/sched/signal.h>
32#include <linux/string.h>
33#include <linux/mm.h>
34#include <linux/socket.h>
35#include <linux/sockios.h>
36#include <linux/in.h>
37#include <linux/errno.h>
38#include <linux/interrupt.h>
39#include <linux/if_addr.h>
40#include <linux/if_ether.h>
41#include <linux/inet.h>
42#include <linux/netdevice.h>
43#include <linux/etherdevice.h>
44#include <linux/skbuff.h>
45#include <linux/init.h>
46#include <linux/notifier.h>
47#include <linux/inetdevice.h>
48#include <linux/igmp.h>
49#include <linux/slab.h>
50#include <linux/hash.h>
51#ifdef CONFIG_SYSCTL
52#include <linux/sysctl.h>
53#endif
54#include <linux/kmod.h>
55#include <linux/netconf.h>
56
57#include <net/arp.h>
58#include <net/ip.h>
59#include <net/route.h>
60#include <net/ip_fib.h>
61#include <net/rtnetlink.h>
62#include <net/net_namespace.h>
63#include <net/addrconf.h>
64
65#define IPV6ONLY_FLAGS \
66 (IFA_F_NODAD | IFA_F_OPTIMISTIC | IFA_F_DADFAILED | \
67 IFA_F_HOMEADDRESS | IFA_F_TENTATIVE | \
68 IFA_F_MANAGETEMPADDR | IFA_F_STABLE_PRIVACY)
69
70static struct ipv4_devconf ipv4_devconf = {
71 .data = {
72 [IPV4_DEVCONF_ACCEPT_REDIRECTS - 1] = 1,
73 [IPV4_DEVCONF_SEND_REDIRECTS - 1] = 1,
74 [IPV4_DEVCONF_SECURE_REDIRECTS - 1] = 1,
75 [IPV4_DEVCONF_SHARED_MEDIA - 1] = 1,
76 [IPV4_DEVCONF_IGMPV2_UNSOLICITED_REPORT_INTERVAL - 1] = 10000 /*ms*/,
77 [IPV4_DEVCONF_IGMPV3_UNSOLICITED_REPORT_INTERVAL - 1] = 1000 /*ms*/,
78 [IPV4_DEVCONF_ARP_EVICT_NOCARRIER - 1] = 1,
79 },
80};
81
82static struct ipv4_devconf ipv4_devconf_dflt = {
83 .data = {
84 [IPV4_DEVCONF_ACCEPT_REDIRECTS - 1] = 1,
85 [IPV4_DEVCONF_SEND_REDIRECTS - 1] = 1,
86 [IPV4_DEVCONF_SECURE_REDIRECTS - 1] = 1,
87 [IPV4_DEVCONF_SHARED_MEDIA - 1] = 1,
88 [IPV4_DEVCONF_ACCEPT_SOURCE_ROUTE - 1] = 1,
89 [IPV4_DEVCONF_IGMPV2_UNSOLICITED_REPORT_INTERVAL - 1] = 10000 /*ms*/,
90 [IPV4_DEVCONF_IGMPV3_UNSOLICITED_REPORT_INTERVAL - 1] = 1000 /*ms*/,
91 [IPV4_DEVCONF_ARP_EVICT_NOCARRIER - 1] = 1,
92 },
93};
94
95#define IPV4_DEVCONF_DFLT(net, attr) \
96 IPV4_DEVCONF((*net->ipv4.devconf_dflt), attr)
97
98static const struct nla_policy ifa_ipv4_policy[IFA_MAX+1] = {
99 [IFA_LOCAL] = { .type = NLA_U32 },
100 [IFA_ADDRESS] = { .type = NLA_U32 },
101 [IFA_BROADCAST] = { .type = NLA_U32 },
102 [IFA_LABEL] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 },
103 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
104 [IFA_FLAGS] = { .type = NLA_U32 },
105 [IFA_RT_PRIORITY] = { .type = NLA_U32 },
106 [IFA_TARGET_NETNSID] = { .type = NLA_S32 },
107 [IFA_PROTO] = { .type = NLA_U8 },
108};
109
110struct inet_fill_args {
111 u32 portid;
112 u32 seq;
113 int event;
114 unsigned int flags;
115 int netnsid;
116 int ifindex;
117};
118
119#define IN4_ADDR_HSIZE_SHIFT 8
120#define IN4_ADDR_HSIZE (1U << IN4_ADDR_HSIZE_SHIFT)
121
122static struct hlist_head inet_addr_lst[IN4_ADDR_HSIZE];
123
124static u32 inet_addr_hash(const struct net *net, __be32 addr)
125{
126 u32 val = (__force u32) addr ^ net_hash_mix(net);
127
128 return hash_32(val, IN4_ADDR_HSIZE_SHIFT);
129}
130
131static void inet_hash_insert(struct net *net, struct in_ifaddr *ifa)
132{
133 u32 hash = inet_addr_hash(net, ifa->ifa_local);
134
135 ASSERT_RTNL();
136 hlist_add_head_rcu(&ifa->hash, &inet_addr_lst[hash]);
137}
138
139static void inet_hash_remove(struct in_ifaddr *ifa)
140{
141 ASSERT_RTNL();
142 hlist_del_init_rcu(&ifa->hash);
143}
144
145/**
146 * __ip_dev_find - find the first device with a given source address.
147 * @net: the net namespace
148 * @addr: the source address
149 * @devref: if true, take a reference on the found device
150 *
151 * If a caller uses devref=false, it should be protected by RCU, or RTNL
152 */
153struct net_device *__ip_dev_find(struct net *net, __be32 addr, bool devref)
154{
155 struct net_device *result = NULL;
156 struct in_ifaddr *ifa;
157
158 rcu_read_lock();
159 ifa = inet_lookup_ifaddr_rcu(net, addr);
160 if (!ifa) {
161 struct flowi4 fl4 = { .daddr = addr };
162 struct fib_result res = { 0 };
163 struct fib_table *local;
164
165 /* Fallback to FIB local table so that communication
166 * over loopback subnets work.
167 */
168 local = fib_get_table(net, RT_TABLE_LOCAL);
169 if (local &&
170 !fib_table_lookup(local, &fl4, &res, FIB_LOOKUP_NOREF) &&
171 res.type == RTN_LOCAL)
172 result = FIB_RES_DEV(res);
173 } else {
174 result = ifa->ifa_dev->dev;
175 }
176 if (result && devref)
177 dev_hold(result);
178 rcu_read_unlock();
179 return result;
180}
181EXPORT_SYMBOL(__ip_dev_find);
182
183/* called under RCU lock */
184struct in_ifaddr *inet_lookup_ifaddr_rcu(struct net *net, __be32 addr)
185{
186 u32 hash = inet_addr_hash(net, addr);
187 struct in_ifaddr *ifa;
188
189 hlist_for_each_entry_rcu(ifa, &inet_addr_lst[hash], hash)
190 if (ifa->ifa_local == addr &&
191 net_eq(dev_net(ifa->ifa_dev->dev), net))
192 return ifa;
193
194 return NULL;
195}
196
197static void rtmsg_ifa(int event, struct in_ifaddr *, struct nlmsghdr *, u32);
198
199static BLOCKING_NOTIFIER_HEAD(inetaddr_chain);
200static BLOCKING_NOTIFIER_HEAD(inetaddr_validator_chain);
201static void inet_del_ifa(struct in_device *in_dev,
202 struct in_ifaddr __rcu **ifap,
203 int destroy);
204#ifdef CONFIG_SYSCTL
205static int devinet_sysctl_register(struct in_device *idev);
206static void devinet_sysctl_unregister(struct in_device *idev);
207#else
208static int devinet_sysctl_register(struct in_device *idev)
209{
210 return 0;
211}
212static void devinet_sysctl_unregister(struct in_device *idev)
213{
214}
215#endif
216
217/* Locks all the inet devices. */
218
219static struct in_ifaddr *inet_alloc_ifa(void)
220{
221 return kzalloc(sizeof(struct in_ifaddr), GFP_KERNEL_ACCOUNT);
222}
223
224static void inet_rcu_free_ifa(struct rcu_head *head)
225{
226 struct in_ifaddr *ifa = container_of(head, struct in_ifaddr, rcu_head);
227 if (ifa->ifa_dev)
228 in_dev_put(ifa->ifa_dev);
229 kfree(ifa);
230}
231
232static void inet_free_ifa(struct in_ifaddr *ifa)
233{
234 call_rcu(&ifa->rcu_head, inet_rcu_free_ifa);
235}
236
237static void in_dev_free_rcu(struct rcu_head *head)
238{
239 struct in_device *idev = container_of(head, struct in_device, rcu_head);
240
241 kfree(rcu_dereference_protected(idev->mc_hash, 1));
242 kfree(idev);
243}
244
245void in_dev_finish_destroy(struct in_device *idev)
246{
247 struct net_device *dev = idev->dev;
248
249 WARN_ON(idev->ifa_list);
250 WARN_ON(idev->mc_list);
251#ifdef NET_REFCNT_DEBUG
252 pr_debug("%s: %p=%s\n", __func__, idev, dev ? dev->name : "NIL");
253#endif
254 netdev_put(dev, &idev->dev_tracker);
255 if (!idev->dead)
256 pr_err("Freeing alive in_device %p\n", idev);
257 else
258 call_rcu(&idev->rcu_head, in_dev_free_rcu);
259}
260EXPORT_SYMBOL(in_dev_finish_destroy);
261
262static struct in_device *inetdev_init(struct net_device *dev)
263{
264 struct in_device *in_dev;
265 int err = -ENOMEM;
266
267 ASSERT_RTNL();
268
269 in_dev = kzalloc(sizeof(*in_dev), GFP_KERNEL);
270 if (!in_dev)
271 goto out;
272 memcpy(&in_dev->cnf, dev_net(dev)->ipv4.devconf_dflt,
273 sizeof(in_dev->cnf));
274 in_dev->cnf.sysctl = NULL;
275 in_dev->dev = dev;
276 in_dev->arp_parms = neigh_parms_alloc(dev, &arp_tbl);
277 if (!in_dev->arp_parms)
278 goto out_kfree;
279 if (IPV4_DEVCONF(in_dev->cnf, FORWARDING))
280 dev_disable_lro(dev);
281 /* Reference in_dev->dev */
282 netdev_hold(dev, &in_dev->dev_tracker, GFP_KERNEL);
283 /* Account for reference dev->ip_ptr (below) */
284 refcount_set(&in_dev->refcnt, 1);
285
286 err = devinet_sysctl_register(in_dev);
287 if (err) {
288 in_dev->dead = 1;
289 neigh_parms_release(&arp_tbl, in_dev->arp_parms);
290 in_dev_put(in_dev);
291 in_dev = NULL;
292 goto out;
293 }
294 ip_mc_init_dev(in_dev);
295 if (dev->flags & IFF_UP)
296 ip_mc_up(in_dev);
297
298 /* we can receive as soon as ip_ptr is set -- do this last */
299 rcu_assign_pointer(dev->ip_ptr, in_dev);
300out:
301 return in_dev ?: ERR_PTR(err);
302out_kfree:
303 kfree(in_dev);
304 in_dev = NULL;
305 goto out;
306}
307
308static void inetdev_destroy(struct in_device *in_dev)
309{
310 struct net_device *dev;
311 struct in_ifaddr *ifa;
312
313 ASSERT_RTNL();
314
315 dev = in_dev->dev;
316
317 in_dev->dead = 1;
318
319 ip_mc_destroy_dev(in_dev);
320
321 while ((ifa = rtnl_dereference(in_dev->ifa_list)) != NULL) {
322 inet_del_ifa(in_dev, &in_dev->ifa_list, 0);
323 inet_free_ifa(ifa);
324 }
325
326 RCU_INIT_POINTER(dev->ip_ptr, NULL);
327
328 devinet_sysctl_unregister(in_dev);
329 neigh_parms_release(&arp_tbl, in_dev->arp_parms);
330 arp_ifdown(dev);
331
332 in_dev_put(in_dev);
333}
334
335int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b)
336{
337 const struct in_ifaddr *ifa;
338
339 rcu_read_lock();
340 in_dev_for_each_ifa_rcu(ifa, in_dev) {
341 if (inet_ifa_match(a, ifa)) {
342 if (!b || inet_ifa_match(b, ifa)) {
343 rcu_read_unlock();
344 return 1;
345 }
346 }
347 }
348 rcu_read_unlock();
349 return 0;
350}
351
352static void __inet_del_ifa(struct in_device *in_dev,
353 struct in_ifaddr __rcu **ifap,
354 int destroy, struct nlmsghdr *nlh, u32 portid)
355{
356 struct in_ifaddr *promote = NULL;
357 struct in_ifaddr *ifa, *ifa1;
358 struct in_ifaddr __rcu **last_prim;
359 struct in_ifaddr *prev_prom = NULL;
360 int do_promote = IN_DEV_PROMOTE_SECONDARIES(in_dev);
361
362 ASSERT_RTNL();
363
364 ifa1 = rtnl_dereference(*ifap);
365 last_prim = ifap;
366 if (in_dev->dead)
367 goto no_promotions;
368
369 /* 1. Deleting primary ifaddr forces deletion all secondaries
370 * unless alias promotion is set
371 **/
372
373 if (!(ifa1->ifa_flags & IFA_F_SECONDARY)) {
374 struct in_ifaddr __rcu **ifap1 = &ifa1->ifa_next;
375
376 while ((ifa = rtnl_dereference(*ifap1)) != NULL) {
377 if (!(ifa->ifa_flags & IFA_F_SECONDARY) &&
378 ifa1->ifa_scope <= ifa->ifa_scope)
379 last_prim = &ifa->ifa_next;
380
381 if (!(ifa->ifa_flags & IFA_F_SECONDARY) ||
382 ifa1->ifa_mask != ifa->ifa_mask ||
383 !inet_ifa_match(ifa1->ifa_address, ifa)) {
384 ifap1 = &ifa->ifa_next;
385 prev_prom = ifa;
386 continue;
387 }
388
389 if (!do_promote) {
390 inet_hash_remove(ifa);
391 *ifap1 = ifa->ifa_next;
392
393 rtmsg_ifa(RTM_DELADDR, ifa, nlh, portid);
394 blocking_notifier_call_chain(&inetaddr_chain,
395 NETDEV_DOWN, ifa);
396 inet_free_ifa(ifa);
397 } else {
398 promote = ifa;
399 break;
400 }
401 }
402 }
403
404 /* On promotion all secondaries from subnet are changing
405 * the primary IP, we must remove all their routes silently
406 * and later to add them back with new prefsrc. Do this
407 * while all addresses are on the device list.
408 */
409 for (ifa = promote; ifa; ifa = rtnl_dereference(ifa->ifa_next)) {
410 if (ifa1->ifa_mask == ifa->ifa_mask &&
411 inet_ifa_match(ifa1->ifa_address, ifa))
412 fib_del_ifaddr(ifa, ifa1);
413 }
414
415no_promotions:
416 /* 2. Unlink it */
417
418 *ifap = ifa1->ifa_next;
419 inet_hash_remove(ifa1);
420
421 /* 3. Announce address deletion */
422
423 /* Send message first, then call notifier.
424 At first sight, FIB update triggered by notifier
425 will refer to already deleted ifaddr, that could confuse
426 netlink listeners. It is not true: look, gated sees
427 that route deleted and if it still thinks that ifaddr
428 is valid, it will try to restore deleted routes... Grr.
429 So that, this order is correct.
430 */
431 rtmsg_ifa(RTM_DELADDR, ifa1, nlh, portid);
432 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa1);
433
434 if (promote) {
435 struct in_ifaddr *next_sec;
436
437 next_sec = rtnl_dereference(promote->ifa_next);
438 if (prev_prom) {
439 struct in_ifaddr *last_sec;
440
441 rcu_assign_pointer(prev_prom->ifa_next, next_sec);
442
443 last_sec = rtnl_dereference(*last_prim);
444 rcu_assign_pointer(promote->ifa_next, last_sec);
445 rcu_assign_pointer(*last_prim, promote);
446 }
447
448 promote->ifa_flags &= ~IFA_F_SECONDARY;
449 rtmsg_ifa(RTM_NEWADDR, promote, nlh, portid);
450 blocking_notifier_call_chain(&inetaddr_chain,
451 NETDEV_UP, promote);
452 for (ifa = next_sec; ifa;
453 ifa = rtnl_dereference(ifa->ifa_next)) {
454 if (ifa1->ifa_mask != ifa->ifa_mask ||
455 !inet_ifa_match(ifa1->ifa_address, ifa))
456 continue;
457 fib_add_ifaddr(ifa);
458 }
459
460 }
461 if (destroy)
462 inet_free_ifa(ifa1);
463}
464
465static void inet_del_ifa(struct in_device *in_dev,
466 struct in_ifaddr __rcu **ifap,
467 int destroy)
468{
469 __inet_del_ifa(in_dev, ifap, destroy, NULL, 0);
470}
471
472static void check_lifetime(struct work_struct *work);
473
474static DECLARE_DELAYED_WORK(check_lifetime_work, check_lifetime);
475
476static int __inet_insert_ifa(struct in_ifaddr *ifa, struct nlmsghdr *nlh,
477 u32 portid, struct netlink_ext_ack *extack)
478{
479 struct in_ifaddr __rcu **last_primary, **ifap;
480 struct in_device *in_dev = ifa->ifa_dev;
481 struct in_validator_info ivi;
482 struct in_ifaddr *ifa1;
483 int ret;
484
485 ASSERT_RTNL();
486
487 if (!ifa->ifa_local) {
488 inet_free_ifa(ifa);
489 return 0;
490 }
491
492 ifa->ifa_flags &= ~IFA_F_SECONDARY;
493 last_primary = &in_dev->ifa_list;
494
495 /* Don't set IPv6 only flags to IPv4 addresses */
496 ifa->ifa_flags &= ~IPV6ONLY_FLAGS;
497
498 ifap = &in_dev->ifa_list;
499 ifa1 = rtnl_dereference(*ifap);
500
501 while (ifa1) {
502 if (!(ifa1->ifa_flags & IFA_F_SECONDARY) &&
503 ifa->ifa_scope <= ifa1->ifa_scope)
504 last_primary = &ifa1->ifa_next;
505 if (ifa1->ifa_mask == ifa->ifa_mask &&
506 inet_ifa_match(ifa1->ifa_address, ifa)) {
507 if (ifa1->ifa_local == ifa->ifa_local) {
508 inet_free_ifa(ifa);
509 return -EEXIST;
510 }
511 if (ifa1->ifa_scope != ifa->ifa_scope) {
512 NL_SET_ERR_MSG(extack, "ipv4: Invalid scope value");
513 inet_free_ifa(ifa);
514 return -EINVAL;
515 }
516 ifa->ifa_flags |= IFA_F_SECONDARY;
517 }
518
519 ifap = &ifa1->ifa_next;
520 ifa1 = rtnl_dereference(*ifap);
521 }
522
523 /* Allow any devices that wish to register ifaddr validtors to weigh
524 * in now, before changes are committed. The rntl lock is serializing
525 * access here, so the state should not change between a validator call
526 * and a final notify on commit. This isn't invoked on promotion under
527 * the assumption that validators are checking the address itself, and
528 * not the flags.
529 */
530 ivi.ivi_addr = ifa->ifa_address;
531 ivi.ivi_dev = ifa->ifa_dev;
532 ivi.extack = extack;
533 ret = blocking_notifier_call_chain(&inetaddr_validator_chain,
534 NETDEV_UP, &ivi);
535 ret = notifier_to_errno(ret);
536 if (ret) {
537 inet_free_ifa(ifa);
538 return ret;
539 }
540
541 if (!(ifa->ifa_flags & IFA_F_SECONDARY))
542 ifap = last_primary;
543
544 rcu_assign_pointer(ifa->ifa_next, *ifap);
545 rcu_assign_pointer(*ifap, ifa);
546
547 inet_hash_insert(dev_net(in_dev->dev), ifa);
548
549 cancel_delayed_work(&check_lifetime_work);
550 queue_delayed_work(system_power_efficient_wq, &check_lifetime_work, 0);
551
552 /* Send message first, then call notifier.
553 Notifier will trigger FIB update, so that
554 listeners of netlink will know about new ifaddr */
555 rtmsg_ifa(RTM_NEWADDR, ifa, nlh, portid);
556 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa);
557
558 return 0;
559}
560
561static int inet_insert_ifa(struct in_ifaddr *ifa)
562{
563 return __inet_insert_ifa(ifa, NULL, 0, NULL);
564}
565
566static int inet_set_ifa(struct net_device *dev, struct in_ifaddr *ifa)
567{
568 struct in_device *in_dev = __in_dev_get_rtnl(dev);
569
570 ASSERT_RTNL();
571
572 if (!in_dev) {
573 inet_free_ifa(ifa);
574 return -ENOBUFS;
575 }
576 ipv4_devconf_setall(in_dev);
577 neigh_parms_data_state_setall(in_dev->arp_parms);
578 if (ifa->ifa_dev != in_dev) {
579 WARN_ON(ifa->ifa_dev);
580 in_dev_hold(in_dev);
581 ifa->ifa_dev = in_dev;
582 }
583 if (ipv4_is_loopback(ifa->ifa_local))
584 ifa->ifa_scope = RT_SCOPE_HOST;
585 return inet_insert_ifa(ifa);
586}
587
588/* Caller must hold RCU or RTNL :
589 * We dont take a reference on found in_device
590 */
591struct in_device *inetdev_by_index(struct net *net, int ifindex)
592{
593 struct net_device *dev;
594 struct in_device *in_dev = NULL;
595
596 rcu_read_lock();
597 dev = dev_get_by_index_rcu(net, ifindex);
598 if (dev)
599 in_dev = rcu_dereference_rtnl(dev->ip_ptr);
600 rcu_read_unlock();
601 return in_dev;
602}
603EXPORT_SYMBOL(inetdev_by_index);
604
605/* Called only from RTNL semaphored context. No locks. */
606
607struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix,
608 __be32 mask)
609{
610 struct in_ifaddr *ifa;
611
612 ASSERT_RTNL();
613
614 in_dev_for_each_ifa_rtnl(ifa, in_dev) {
615 if (ifa->ifa_mask == mask && inet_ifa_match(prefix, ifa))
616 return ifa;
617 }
618 return NULL;
619}
620
621static int ip_mc_autojoin_config(struct net *net, bool join,
622 const struct in_ifaddr *ifa)
623{
624#if defined(CONFIG_IP_MULTICAST)
625 struct ip_mreqn mreq = {
626 .imr_multiaddr.s_addr = ifa->ifa_address,
627 .imr_ifindex = ifa->ifa_dev->dev->ifindex,
628 };
629 struct sock *sk = net->ipv4.mc_autojoin_sk;
630 int ret;
631
632 ASSERT_RTNL();
633
634 lock_sock(sk);
635 if (join)
636 ret = ip_mc_join_group(sk, &mreq);
637 else
638 ret = ip_mc_leave_group(sk, &mreq);
639 release_sock(sk);
640
641 return ret;
642#else
643 return -EOPNOTSUPP;
644#endif
645}
646
647static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
648 struct netlink_ext_ack *extack)
649{
650 struct net *net = sock_net(skb->sk);
651 struct in_ifaddr __rcu **ifap;
652 struct nlattr *tb[IFA_MAX+1];
653 struct in_device *in_dev;
654 struct ifaddrmsg *ifm;
655 struct in_ifaddr *ifa;
656 int err;
657
658 ASSERT_RTNL();
659
660 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
661 ifa_ipv4_policy, extack);
662 if (err < 0)
663 goto errout;
664
665 ifm = nlmsg_data(nlh);
666 in_dev = inetdev_by_index(net, ifm->ifa_index);
667 if (!in_dev) {
668 NL_SET_ERR_MSG(extack, "ipv4: Device not found");
669 err = -ENODEV;
670 goto errout;
671 }
672
673 for (ifap = &in_dev->ifa_list; (ifa = rtnl_dereference(*ifap)) != NULL;
674 ifap = &ifa->ifa_next) {
675 if (tb[IFA_LOCAL] &&
676 ifa->ifa_local != nla_get_in_addr(tb[IFA_LOCAL]))
677 continue;
678
679 if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label))
680 continue;
681
682 if (tb[IFA_ADDRESS] &&
683 (ifm->ifa_prefixlen != ifa->ifa_prefixlen ||
684 !inet_ifa_match(nla_get_in_addr(tb[IFA_ADDRESS]), ifa)))
685 continue;
686
687 if (ipv4_is_multicast(ifa->ifa_address))
688 ip_mc_autojoin_config(net, false, ifa);
689 __inet_del_ifa(in_dev, ifap, 1, nlh, NETLINK_CB(skb).portid);
690 return 0;
691 }
692
693 NL_SET_ERR_MSG(extack, "ipv4: Address not found");
694 err = -EADDRNOTAVAIL;
695errout:
696 return err;
697}
698
699#define INFINITY_LIFE_TIME 0xFFFFFFFF
700
701static void check_lifetime(struct work_struct *work)
702{
703 unsigned long now, next, next_sec, next_sched;
704 struct in_ifaddr *ifa;
705 struct hlist_node *n;
706 int i;
707
708 now = jiffies;
709 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
710
711 for (i = 0; i < IN4_ADDR_HSIZE; i++) {
712 bool change_needed = false;
713
714 rcu_read_lock();
715 hlist_for_each_entry_rcu(ifa, &inet_addr_lst[i], hash) {
716 unsigned long age, tstamp;
717 u32 preferred_lft;
718 u32 valid_lft;
719 u32 flags;
720
721 flags = READ_ONCE(ifa->ifa_flags);
722 if (flags & IFA_F_PERMANENT)
723 continue;
724
725 preferred_lft = READ_ONCE(ifa->ifa_preferred_lft);
726 valid_lft = READ_ONCE(ifa->ifa_valid_lft);
727 tstamp = READ_ONCE(ifa->ifa_tstamp);
728 /* We try to batch several events at once. */
729 age = (now - tstamp +
730 ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
731
732 if (valid_lft != INFINITY_LIFE_TIME &&
733 age >= valid_lft) {
734 change_needed = true;
735 } else if (preferred_lft ==
736 INFINITY_LIFE_TIME) {
737 continue;
738 } else if (age >= preferred_lft) {
739 if (time_before(tstamp + valid_lft * HZ, next))
740 next = tstamp + valid_lft * HZ;
741
742 if (!(flags & IFA_F_DEPRECATED))
743 change_needed = true;
744 } else if (time_before(tstamp + preferred_lft * HZ,
745 next)) {
746 next = tstamp + preferred_lft * HZ;
747 }
748 }
749 rcu_read_unlock();
750 if (!change_needed)
751 continue;
752 rtnl_lock();
753 hlist_for_each_entry_safe(ifa, n, &inet_addr_lst[i], hash) {
754 unsigned long age;
755
756 if (ifa->ifa_flags & IFA_F_PERMANENT)
757 continue;
758
759 /* We try to batch several events at once. */
760 age = (now - ifa->ifa_tstamp +
761 ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
762
763 if (ifa->ifa_valid_lft != INFINITY_LIFE_TIME &&
764 age >= ifa->ifa_valid_lft) {
765 struct in_ifaddr __rcu **ifap;
766 struct in_ifaddr *tmp;
767
768 ifap = &ifa->ifa_dev->ifa_list;
769 tmp = rtnl_dereference(*ifap);
770 while (tmp) {
771 if (tmp == ifa) {
772 inet_del_ifa(ifa->ifa_dev,
773 ifap, 1);
774 break;
775 }
776 ifap = &tmp->ifa_next;
777 tmp = rtnl_dereference(*ifap);
778 }
779 } else if (ifa->ifa_preferred_lft !=
780 INFINITY_LIFE_TIME &&
781 age >= ifa->ifa_preferred_lft &&
782 !(ifa->ifa_flags & IFA_F_DEPRECATED)) {
783 ifa->ifa_flags |= IFA_F_DEPRECATED;
784 rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0);
785 }
786 }
787 rtnl_unlock();
788 }
789
790 next_sec = round_jiffies_up(next);
791 next_sched = next;
792
793 /* If rounded timeout is accurate enough, accept it. */
794 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
795 next_sched = next_sec;
796
797 now = jiffies;
798 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
799 if (time_before(next_sched, now + ADDRCONF_TIMER_FUZZ_MAX))
800 next_sched = now + ADDRCONF_TIMER_FUZZ_MAX;
801
802 queue_delayed_work(system_power_efficient_wq, &check_lifetime_work,
803 next_sched - now);
804}
805
806static void set_ifa_lifetime(struct in_ifaddr *ifa, __u32 valid_lft,
807 __u32 prefered_lft)
808{
809 unsigned long timeout;
810 u32 flags;
811
812 flags = ifa->ifa_flags & ~(IFA_F_PERMANENT | IFA_F_DEPRECATED);
813
814 timeout = addrconf_timeout_fixup(valid_lft, HZ);
815 if (addrconf_finite_timeout(timeout))
816 WRITE_ONCE(ifa->ifa_valid_lft, timeout);
817 else
818 flags |= IFA_F_PERMANENT;
819
820 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
821 if (addrconf_finite_timeout(timeout)) {
822 if (timeout == 0)
823 flags |= IFA_F_DEPRECATED;
824 WRITE_ONCE(ifa->ifa_preferred_lft, timeout);
825 }
826 WRITE_ONCE(ifa->ifa_flags, flags);
827 WRITE_ONCE(ifa->ifa_tstamp, jiffies);
828 if (!ifa->ifa_cstamp)
829 WRITE_ONCE(ifa->ifa_cstamp, ifa->ifa_tstamp);
830}
831
832static struct in_ifaddr *rtm_to_ifaddr(struct net *net, struct nlmsghdr *nlh,
833 __u32 *pvalid_lft, __u32 *pprefered_lft,
834 struct netlink_ext_ack *extack)
835{
836 struct nlattr *tb[IFA_MAX+1];
837 struct in_ifaddr *ifa;
838 struct ifaddrmsg *ifm;
839 struct net_device *dev;
840 struct in_device *in_dev;
841 int err;
842
843 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
844 ifa_ipv4_policy, extack);
845 if (err < 0)
846 goto errout;
847
848 ifm = nlmsg_data(nlh);
849 err = -EINVAL;
850
851 if (ifm->ifa_prefixlen > 32) {
852 NL_SET_ERR_MSG(extack, "ipv4: Invalid prefix length");
853 goto errout;
854 }
855
856 if (!tb[IFA_LOCAL]) {
857 NL_SET_ERR_MSG(extack, "ipv4: Local address is not supplied");
858 goto errout;
859 }
860
861 dev = __dev_get_by_index(net, ifm->ifa_index);
862 err = -ENODEV;
863 if (!dev) {
864 NL_SET_ERR_MSG(extack, "ipv4: Device not found");
865 goto errout;
866 }
867
868 in_dev = __in_dev_get_rtnl(dev);
869 err = -ENOBUFS;
870 if (!in_dev)
871 goto errout;
872
873 ifa = inet_alloc_ifa();
874 if (!ifa)
875 /*
876 * A potential indev allocation can be left alive, it stays
877 * assigned to its device and is destroy with it.
878 */
879 goto errout;
880
881 ipv4_devconf_setall(in_dev);
882 neigh_parms_data_state_setall(in_dev->arp_parms);
883 in_dev_hold(in_dev);
884
885 if (!tb[IFA_ADDRESS])
886 tb[IFA_ADDRESS] = tb[IFA_LOCAL];
887
888 INIT_HLIST_NODE(&ifa->hash);
889 ifa->ifa_prefixlen = ifm->ifa_prefixlen;
890 ifa->ifa_mask = inet_make_mask(ifm->ifa_prefixlen);
891 ifa->ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) :
892 ifm->ifa_flags;
893 ifa->ifa_scope = ifm->ifa_scope;
894 ifa->ifa_dev = in_dev;
895
896 ifa->ifa_local = nla_get_in_addr(tb[IFA_LOCAL]);
897 ifa->ifa_address = nla_get_in_addr(tb[IFA_ADDRESS]);
898
899 if (tb[IFA_BROADCAST])
900 ifa->ifa_broadcast = nla_get_in_addr(tb[IFA_BROADCAST]);
901
902 if (tb[IFA_LABEL])
903 nla_strscpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ);
904 else
905 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
906
907 if (tb[IFA_RT_PRIORITY])
908 ifa->ifa_rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]);
909
910 if (tb[IFA_PROTO])
911 ifa->ifa_proto = nla_get_u8(tb[IFA_PROTO]);
912
913 if (tb[IFA_CACHEINFO]) {
914 struct ifa_cacheinfo *ci;
915
916 ci = nla_data(tb[IFA_CACHEINFO]);
917 if (!ci->ifa_valid || ci->ifa_prefered > ci->ifa_valid) {
918 NL_SET_ERR_MSG(extack, "ipv4: address lifetime invalid");
919 err = -EINVAL;
920 goto errout_free;
921 }
922 *pvalid_lft = ci->ifa_valid;
923 *pprefered_lft = ci->ifa_prefered;
924 }
925
926 return ifa;
927
928errout_free:
929 inet_free_ifa(ifa);
930errout:
931 return ERR_PTR(err);
932}
933
934static struct in_ifaddr *find_matching_ifa(struct in_ifaddr *ifa)
935{
936 struct in_device *in_dev = ifa->ifa_dev;
937 struct in_ifaddr *ifa1;
938
939 if (!ifa->ifa_local)
940 return NULL;
941
942 in_dev_for_each_ifa_rtnl(ifa1, in_dev) {
943 if (ifa1->ifa_mask == ifa->ifa_mask &&
944 inet_ifa_match(ifa1->ifa_address, ifa) &&
945 ifa1->ifa_local == ifa->ifa_local)
946 return ifa1;
947 }
948 return NULL;
949}
950
951static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
952 struct netlink_ext_ack *extack)
953{
954 struct net *net = sock_net(skb->sk);
955 struct in_ifaddr *ifa;
956 struct in_ifaddr *ifa_existing;
957 __u32 valid_lft = INFINITY_LIFE_TIME;
958 __u32 prefered_lft = INFINITY_LIFE_TIME;
959
960 ASSERT_RTNL();
961
962 ifa = rtm_to_ifaddr(net, nlh, &valid_lft, &prefered_lft, extack);
963 if (IS_ERR(ifa))
964 return PTR_ERR(ifa);
965
966 ifa_existing = find_matching_ifa(ifa);
967 if (!ifa_existing) {
968 /* It would be best to check for !NLM_F_CREATE here but
969 * userspace already relies on not having to provide this.
970 */
971 set_ifa_lifetime(ifa, valid_lft, prefered_lft);
972 if (ifa->ifa_flags & IFA_F_MCAUTOJOIN) {
973 int ret = ip_mc_autojoin_config(net, true, ifa);
974
975 if (ret < 0) {
976 NL_SET_ERR_MSG(extack, "ipv4: Multicast auto join failed");
977 inet_free_ifa(ifa);
978 return ret;
979 }
980 }
981 return __inet_insert_ifa(ifa, nlh, NETLINK_CB(skb).portid,
982 extack);
983 } else {
984 u32 new_metric = ifa->ifa_rt_priority;
985 u8 new_proto = ifa->ifa_proto;
986
987 inet_free_ifa(ifa);
988
989 if (nlh->nlmsg_flags & NLM_F_EXCL ||
990 !(nlh->nlmsg_flags & NLM_F_REPLACE)) {
991 NL_SET_ERR_MSG(extack, "ipv4: Address already assigned");
992 return -EEXIST;
993 }
994 ifa = ifa_existing;
995
996 if (ifa->ifa_rt_priority != new_metric) {
997 fib_modify_prefix_metric(ifa, new_metric);
998 ifa->ifa_rt_priority = new_metric;
999 }
1000
1001 ifa->ifa_proto = new_proto;
1002
1003 set_ifa_lifetime(ifa, valid_lft, prefered_lft);
1004 cancel_delayed_work(&check_lifetime_work);
1005 queue_delayed_work(system_power_efficient_wq,
1006 &check_lifetime_work, 0);
1007 rtmsg_ifa(RTM_NEWADDR, ifa, nlh, NETLINK_CB(skb).portid);
1008 }
1009 return 0;
1010}
1011
1012/*
1013 * Determine a default network mask, based on the IP address.
1014 */
1015
1016static int inet_abc_len(__be32 addr)
1017{
1018 int rc = -1; /* Something else, probably a multicast. */
1019
1020 if (ipv4_is_zeronet(addr) || ipv4_is_lbcast(addr))
1021 rc = 0;
1022 else {
1023 __u32 haddr = ntohl(addr);
1024 if (IN_CLASSA(haddr))
1025 rc = 8;
1026 else if (IN_CLASSB(haddr))
1027 rc = 16;
1028 else if (IN_CLASSC(haddr))
1029 rc = 24;
1030 else if (IN_CLASSE(haddr))
1031 rc = 32;
1032 }
1033
1034 return rc;
1035}
1036
1037
1038int devinet_ioctl(struct net *net, unsigned int cmd, struct ifreq *ifr)
1039{
1040 struct sockaddr_in sin_orig;
1041 struct sockaddr_in *sin = (struct sockaddr_in *)&ifr->ifr_addr;
1042 struct in_ifaddr __rcu **ifap = NULL;
1043 struct in_device *in_dev;
1044 struct in_ifaddr *ifa = NULL;
1045 struct net_device *dev;
1046 char *colon;
1047 int ret = -EFAULT;
1048 int tryaddrmatch = 0;
1049
1050 ifr->ifr_name[IFNAMSIZ - 1] = 0;
1051
1052 /* save original address for comparison */
1053 memcpy(&sin_orig, sin, sizeof(*sin));
1054
1055 colon = strchr(ifr->ifr_name, ':');
1056 if (colon)
1057 *colon = 0;
1058
1059 dev_load(net, ifr->ifr_name);
1060
1061 switch (cmd) {
1062 case SIOCGIFADDR: /* Get interface address */
1063 case SIOCGIFBRDADDR: /* Get the broadcast address */
1064 case SIOCGIFDSTADDR: /* Get the destination address */
1065 case SIOCGIFNETMASK: /* Get the netmask for the interface */
1066 /* Note that these ioctls will not sleep,
1067 so that we do not impose a lock.
1068 One day we will be forced to put shlock here (I mean SMP)
1069 */
1070 tryaddrmatch = (sin_orig.sin_family == AF_INET);
1071 memset(sin, 0, sizeof(*sin));
1072 sin->sin_family = AF_INET;
1073 break;
1074
1075 case SIOCSIFFLAGS:
1076 ret = -EPERM;
1077 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1078 goto out;
1079 break;
1080 case SIOCSIFADDR: /* Set interface address (and family) */
1081 case SIOCSIFBRDADDR: /* Set the broadcast address */
1082 case SIOCSIFDSTADDR: /* Set the destination address */
1083 case SIOCSIFNETMASK: /* Set the netmask for the interface */
1084 ret = -EPERM;
1085 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1086 goto out;
1087 ret = -EINVAL;
1088 if (sin->sin_family != AF_INET)
1089 goto out;
1090 break;
1091 default:
1092 ret = -EINVAL;
1093 goto out;
1094 }
1095
1096 rtnl_lock();
1097
1098 ret = -ENODEV;
1099 dev = __dev_get_by_name(net, ifr->ifr_name);
1100 if (!dev)
1101 goto done;
1102
1103 if (colon)
1104 *colon = ':';
1105
1106 in_dev = __in_dev_get_rtnl(dev);
1107 if (in_dev) {
1108 if (tryaddrmatch) {
1109 /* Matthias Andree */
1110 /* compare label and address (4.4BSD style) */
1111 /* note: we only do this for a limited set of ioctls
1112 and only if the original address family was AF_INET.
1113 This is checked above. */
1114
1115 for (ifap = &in_dev->ifa_list;
1116 (ifa = rtnl_dereference(*ifap)) != NULL;
1117 ifap = &ifa->ifa_next) {
1118 if (!strcmp(ifr->ifr_name, ifa->ifa_label) &&
1119 sin_orig.sin_addr.s_addr ==
1120 ifa->ifa_local) {
1121 break; /* found */
1122 }
1123 }
1124 }
1125 /* we didn't get a match, maybe the application is
1126 4.3BSD-style and passed in junk so we fall back to
1127 comparing just the label */
1128 if (!ifa) {
1129 for (ifap = &in_dev->ifa_list;
1130 (ifa = rtnl_dereference(*ifap)) != NULL;
1131 ifap = &ifa->ifa_next)
1132 if (!strcmp(ifr->ifr_name, ifa->ifa_label))
1133 break;
1134 }
1135 }
1136
1137 ret = -EADDRNOTAVAIL;
1138 if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS)
1139 goto done;
1140
1141 switch (cmd) {
1142 case SIOCGIFADDR: /* Get interface address */
1143 ret = 0;
1144 sin->sin_addr.s_addr = ifa->ifa_local;
1145 break;
1146
1147 case SIOCGIFBRDADDR: /* Get the broadcast address */
1148 ret = 0;
1149 sin->sin_addr.s_addr = ifa->ifa_broadcast;
1150 break;
1151
1152 case SIOCGIFDSTADDR: /* Get the destination address */
1153 ret = 0;
1154 sin->sin_addr.s_addr = ifa->ifa_address;
1155 break;
1156
1157 case SIOCGIFNETMASK: /* Get the netmask for the interface */
1158 ret = 0;
1159 sin->sin_addr.s_addr = ifa->ifa_mask;
1160 break;
1161
1162 case SIOCSIFFLAGS:
1163 if (colon) {
1164 ret = -EADDRNOTAVAIL;
1165 if (!ifa)
1166 break;
1167 ret = 0;
1168 if (!(ifr->ifr_flags & IFF_UP))
1169 inet_del_ifa(in_dev, ifap, 1);
1170 break;
1171 }
1172 ret = dev_change_flags(dev, ifr->ifr_flags, NULL);
1173 break;
1174
1175 case SIOCSIFADDR: /* Set interface address (and family) */
1176 ret = -EINVAL;
1177 if (inet_abc_len(sin->sin_addr.s_addr) < 0)
1178 break;
1179
1180 if (!ifa) {
1181 ret = -ENOBUFS;
1182 ifa = inet_alloc_ifa();
1183 if (!ifa)
1184 break;
1185 INIT_HLIST_NODE(&ifa->hash);
1186 if (colon)
1187 memcpy(ifa->ifa_label, ifr->ifr_name, IFNAMSIZ);
1188 else
1189 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1190 } else {
1191 ret = 0;
1192 if (ifa->ifa_local == sin->sin_addr.s_addr)
1193 break;
1194 inet_del_ifa(in_dev, ifap, 0);
1195 ifa->ifa_broadcast = 0;
1196 ifa->ifa_scope = 0;
1197 }
1198
1199 ifa->ifa_address = ifa->ifa_local = sin->sin_addr.s_addr;
1200
1201 if (!(dev->flags & IFF_POINTOPOINT)) {
1202 ifa->ifa_prefixlen = inet_abc_len(ifa->ifa_address);
1203 ifa->ifa_mask = inet_make_mask(ifa->ifa_prefixlen);
1204 if ((dev->flags & IFF_BROADCAST) &&
1205 ifa->ifa_prefixlen < 31)
1206 ifa->ifa_broadcast = ifa->ifa_address |
1207 ~ifa->ifa_mask;
1208 } else {
1209 ifa->ifa_prefixlen = 32;
1210 ifa->ifa_mask = inet_make_mask(32);
1211 }
1212 set_ifa_lifetime(ifa, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1213 ret = inet_set_ifa(dev, ifa);
1214 break;
1215
1216 case SIOCSIFBRDADDR: /* Set the broadcast address */
1217 ret = 0;
1218 if (ifa->ifa_broadcast != sin->sin_addr.s_addr) {
1219 inet_del_ifa(in_dev, ifap, 0);
1220 ifa->ifa_broadcast = sin->sin_addr.s_addr;
1221 inet_insert_ifa(ifa);
1222 }
1223 break;
1224
1225 case SIOCSIFDSTADDR: /* Set the destination address */
1226 ret = 0;
1227 if (ifa->ifa_address == sin->sin_addr.s_addr)
1228 break;
1229 ret = -EINVAL;
1230 if (inet_abc_len(sin->sin_addr.s_addr) < 0)
1231 break;
1232 ret = 0;
1233 inet_del_ifa(in_dev, ifap, 0);
1234 ifa->ifa_address = sin->sin_addr.s_addr;
1235 inet_insert_ifa(ifa);
1236 break;
1237
1238 case SIOCSIFNETMASK: /* Set the netmask for the interface */
1239
1240 /*
1241 * The mask we set must be legal.
1242 */
1243 ret = -EINVAL;
1244 if (bad_mask(sin->sin_addr.s_addr, 0))
1245 break;
1246 ret = 0;
1247 if (ifa->ifa_mask != sin->sin_addr.s_addr) {
1248 __be32 old_mask = ifa->ifa_mask;
1249 inet_del_ifa(in_dev, ifap, 0);
1250 ifa->ifa_mask = sin->sin_addr.s_addr;
1251 ifa->ifa_prefixlen = inet_mask_len(ifa->ifa_mask);
1252
1253 /* See if current broadcast address matches
1254 * with current netmask, then recalculate
1255 * the broadcast address. Otherwise it's a
1256 * funny address, so don't touch it since
1257 * the user seems to know what (s)he's doing...
1258 */
1259 if ((dev->flags & IFF_BROADCAST) &&
1260 (ifa->ifa_prefixlen < 31) &&
1261 (ifa->ifa_broadcast ==
1262 (ifa->ifa_local|~old_mask))) {
1263 ifa->ifa_broadcast = (ifa->ifa_local |
1264 ~sin->sin_addr.s_addr);
1265 }
1266 inet_insert_ifa(ifa);
1267 }
1268 break;
1269 }
1270done:
1271 rtnl_unlock();
1272out:
1273 return ret;
1274}
1275
1276int inet_gifconf(struct net_device *dev, char __user *buf, int len, int size)
1277{
1278 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1279 const struct in_ifaddr *ifa;
1280 struct ifreq ifr;
1281 int done = 0;
1282
1283 if (WARN_ON(size > sizeof(struct ifreq)))
1284 goto out;
1285
1286 if (!in_dev)
1287 goto out;
1288
1289 in_dev_for_each_ifa_rtnl(ifa, in_dev) {
1290 if (!buf) {
1291 done += size;
1292 continue;
1293 }
1294 if (len < size)
1295 break;
1296 memset(&ifr, 0, sizeof(struct ifreq));
1297 strcpy(ifr.ifr_name, ifa->ifa_label);
1298
1299 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_family = AF_INET;
1300 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_addr.s_addr =
1301 ifa->ifa_local;
1302
1303 if (copy_to_user(buf + done, &ifr, size)) {
1304 done = -EFAULT;
1305 break;
1306 }
1307 len -= size;
1308 done += size;
1309 }
1310out:
1311 return done;
1312}
1313
1314static __be32 in_dev_select_addr(const struct in_device *in_dev,
1315 int scope)
1316{
1317 const struct in_ifaddr *ifa;
1318
1319 in_dev_for_each_ifa_rcu(ifa, in_dev) {
1320 if (READ_ONCE(ifa->ifa_flags) & IFA_F_SECONDARY)
1321 continue;
1322 if (ifa->ifa_scope != RT_SCOPE_LINK &&
1323 ifa->ifa_scope <= scope)
1324 return ifa->ifa_local;
1325 }
1326
1327 return 0;
1328}
1329
1330__be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope)
1331{
1332 const struct in_ifaddr *ifa;
1333 __be32 addr = 0;
1334 unsigned char localnet_scope = RT_SCOPE_HOST;
1335 struct in_device *in_dev;
1336 struct net *net = dev_net(dev);
1337 int master_idx;
1338
1339 rcu_read_lock();
1340 in_dev = __in_dev_get_rcu(dev);
1341 if (!in_dev)
1342 goto no_in_dev;
1343
1344 if (unlikely(IN_DEV_ROUTE_LOCALNET(in_dev)))
1345 localnet_scope = RT_SCOPE_LINK;
1346
1347 in_dev_for_each_ifa_rcu(ifa, in_dev) {
1348 if (READ_ONCE(ifa->ifa_flags) & IFA_F_SECONDARY)
1349 continue;
1350 if (min(ifa->ifa_scope, localnet_scope) > scope)
1351 continue;
1352 if (!dst || inet_ifa_match(dst, ifa)) {
1353 addr = ifa->ifa_local;
1354 break;
1355 }
1356 if (!addr)
1357 addr = ifa->ifa_local;
1358 }
1359
1360 if (addr)
1361 goto out_unlock;
1362no_in_dev:
1363 master_idx = l3mdev_master_ifindex_rcu(dev);
1364
1365 /* For VRFs, the VRF device takes the place of the loopback device,
1366 * with addresses on it being preferred. Note in such cases the
1367 * loopback device will be among the devices that fail the master_idx
1368 * equality check in the loop below.
1369 */
1370 if (master_idx &&
1371 (dev = dev_get_by_index_rcu(net, master_idx)) &&
1372 (in_dev = __in_dev_get_rcu(dev))) {
1373 addr = in_dev_select_addr(in_dev, scope);
1374 if (addr)
1375 goto out_unlock;
1376 }
1377
1378 /* Not loopback addresses on loopback should be preferred
1379 in this case. It is important that lo is the first interface
1380 in dev_base list.
1381 */
1382 for_each_netdev_rcu(net, dev) {
1383 if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1384 continue;
1385
1386 in_dev = __in_dev_get_rcu(dev);
1387 if (!in_dev)
1388 continue;
1389
1390 addr = in_dev_select_addr(in_dev, scope);
1391 if (addr)
1392 goto out_unlock;
1393 }
1394out_unlock:
1395 rcu_read_unlock();
1396 return addr;
1397}
1398EXPORT_SYMBOL(inet_select_addr);
1399
1400static __be32 confirm_addr_indev(struct in_device *in_dev, __be32 dst,
1401 __be32 local, int scope)
1402{
1403 unsigned char localnet_scope = RT_SCOPE_HOST;
1404 const struct in_ifaddr *ifa;
1405 __be32 addr = 0;
1406 int same = 0;
1407
1408 if (unlikely(IN_DEV_ROUTE_LOCALNET(in_dev)))
1409 localnet_scope = RT_SCOPE_LINK;
1410
1411 in_dev_for_each_ifa_rcu(ifa, in_dev) {
1412 unsigned char min_scope = min(ifa->ifa_scope, localnet_scope);
1413
1414 if (!addr &&
1415 (local == ifa->ifa_local || !local) &&
1416 min_scope <= scope) {
1417 addr = ifa->ifa_local;
1418 if (same)
1419 break;
1420 }
1421 if (!same) {
1422 same = (!local || inet_ifa_match(local, ifa)) &&
1423 (!dst || inet_ifa_match(dst, ifa));
1424 if (same && addr) {
1425 if (local || !dst)
1426 break;
1427 /* Is the selected addr into dst subnet? */
1428 if (inet_ifa_match(addr, ifa))
1429 break;
1430 /* No, then can we use new local src? */
1431 if (min_scope <= scope) {
1432 addr = ifa->ifa_local;
1433 break;
1434 }
1435 /* search for large dst subnet for addr */
1436 same = 0;
1437 }
1438 }
1439 }
1440
1441 return same ? addr : 0;
1442}
1443
1444/*
1445 * Confirm that local IP address exists using wildcards:
1446 * - net: netns to check, cannot be NULL
1447 * - in_dev: only on this interface, NULL=any interface
1448 * - dst: only in the same subnet as dst, 0=any dst
1449 * - local: address, 0=autoselect the local address
1450 * - scope: maximum allowed scope value for the local address
1451 */
1452__be32 inet_confirm_addr(struct net *net, struct in_device *in_dev,
1453 __be32 dst, __be32 local, int scope)
1454{
1455 __be32 addr = 0;
1456 struct net_device *dev;
1457
1458 if (in_dev)
1459 return confirm_addr_indev(in_dev, dst, local, scope);
1460
1461 rcu_read_lock();
1462 for_each_netdev_rcu(net, dev) {
1463 in_dev = __in_dev_get_rcu(dev);
1464 if (in_dev) {
1465 addr = confirm_addr_indev(in_dev, dst, local, scope);
1466 if (addr)
1467 break;
1468 }
1469 }
1470 rcu_read_unlock();
1471
1472 return addr;
1473}
1474EXPORT_SYMBOL(inet_confirm_addr);
1475
1476/*
1477 * Device notifier
1478 */
1479
1480int register_inetaddr_notifier(struct notifier_block *nb)
1481{
1482 return blocking_notifier_chain_register(&inetaddr_chain, nb);
1483}
1484EXPORT_SYMBOL(register_inetaddr_notifier);
1485
1486int unregister_inetaddr_notifier(struct notifier_block *nb)
1487{
1488 return blocking_notifier_chain_unregister(&inetaddr_chain, nb);
1489}
1490EXPORT_SYMBOL(unregister_inetaddr_notifier);
1491
1492int register_inetaddr_validator_notifier(struct notifier_block *nb)
1493{
1494 return blocking_notifier_chain_register(&inetaddr_validator_chain, nb);
1495}
1496EXPORT_SYMBOL(register_inetaddr_validator_notifier);
1497
1498int unregister_inetaddr_validator_notifier(struct notifier_block *nb)
1499{
1500 return blocking_notifier_chain_unregister(&inetaddr_validator_chain,
1501 nb);
1502}
1503EXPORT_SYMBOL(unregister_inetaddr_validator_notifier);
1504
1505/* Rename ifa_labels for a device name change. Make some effort to preserve
1506 * existing alias numbering and to create unique labels if possible.
1507*/
1508static void inetdev_changename(struct net_device *dev, struct in_device *in_dev)
1509{
1510 struct in_ifaddr *ifa;
1511 int named = 0;
1512
1513 in_dev_for_each_ifa_rtnl(ifa, in_dev) {
1514 char old[IFNAMSIZ], *dot;
1515
1516 memcpy(old, ifa->ifa_label, IFNAMSIZ);
1517 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1518 if (named++ == 0)
1519 goto skip;
1520 dot = strchr(old, ':');
1521 if (!dot) {
1522 sprintf(old, ":%d", named);
1523 dot = old;
1524 }
1525 if (strlen(dot) + strlen(dev->name) < IFNAMSIZ)
1526 strcat(ifa->ifa_label, dot);
1527 else
1528 strcpy(ifa->ifa_label + (IFNAMSIZ - strlen(dot) - 1), dot);
1529skip:
1530 rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0);
1531 }
1532}
1533
1534static void inetdev_send_gratuitous_arp(struct net_device *dev,
1535 struct in_device *in_dev)
1536
1537{
1538 const struct in_ifaddr *ifa;
1539
1540 in_dev_for_each_ifa_rtnl(ifa, in_dev) {
1541 arp_send(ARPOP_REQUEST, ETH_P_ARP,
1542 ifa->ifa_local, dev,
1543 ifa->ifa_local, NULL,
1544 dev->dev_addr, NULL);
1545 }
1546}
1547
1548/* Called only under RTNL semaphore */
1549
1550static int inetdev_event(struct notifier_block *this, unsigned long event,
1551 void *ptr)
1552{
1553 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1554 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1555
1556 ASSERT_RTNL();
1557
1558 if (!in_dev) {
1559 if (event == NETDEV_REGISTER) {
1560 in_dev = inetdev_init(dev);
1561 if (IS_ERR(in_dev))
1562 return notifier_from_errno(PTR_ERR(in_dev));
1563 if (dev->flags & IFF_LOOPBACK) {
1564 IN_DEV_CONF_SET(in_dev, NOXFRM, 1);
1565 IN_DEV_CONF_SET(in_dev, NOPOLICY, 1);
1566 }
1567 } else if (event == NETDEV_CHANGEMTU) {
1568 /* Re-enabling IP */
1569 if (inetdev_valid_mtu(dev->mtu))
1570 in_dev = inetdev_init(dev);
1571 }
1572 goto out;
1573 }
1574
1575 switch (event) {
1576 case NETDEV_REGISTER:
1577 pr_debug("%s: bug\n", __func__);
1578 RCU_INIT_POINTER(dev->ip_ptr, NULL);
1579 break;
1580 case NETDEV_UP:
1581 if (!inetdev_valid_mtu(dev->mtu))
1582 break;
1583 if (dev->flags & IFF_LOOPBACK) {
1584 struct in_ifaddr *ifa = inet_alloc_ifa();
1585
1586 if (ifa) {
1587 INIT_HLIST_NODE(&ifa->hash);
1588 ifa->ifa_local =
1589 ifa->ifa_address = htonl(INADDR_LOOPBACK);
1590 ifa->ifa_prefixlen = 8;
1591 ifa->ifa_mask = inet_make_mask(8);
1592 in_dev_hold(in_dev);
1593 ifa->ifa_dev = in_dev;
1594 ifa->ifa_scope = RT_SCOPE_HOST;
1595 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1596 set_ifa_lifetime(ifa, INFINITY_LIFE_TIME,
1597 INFINITY_LIFE_TIME);
1598 ipv4_devconf_setall(in_dev);
1599 neigh_parms_data_state_setall(in_dev->arp_parms);
1600 inet_insert_ifa(ifa);
1601 }
1602 }
1603 ip_mc_up(in_dev);
1604 fallthrough;
1605 case NETDEV_CHANGEADDR:
1606 if (!IN_DEV_ARP_NOTIFY(in_dev))
1607 break;
1608 fallthrough;
1609 case NETDEV_NOTIFY_PEERS:
1610 /* Send gratuitous ARP to notify of link change */
1611 inetdev_send_gratuitous_arp(dev, in_dev);
1612 break;
1613 case NETDEV_DOWN:
1614 ip_mc_down(in_dev);
1615 break;
1616 case NETDEV_PRE_TYPE_CHANGE:
1617 ip_mc_unmap(in_dev);
1618 break;
1619 case NETDEV_POST_TYPE_CHANGE:
1620 ip_mc_remap(in_dev);
1621 break;
1622 case NETDEV_CHANGEMTU:
1623 if (inetdev_valid_mtu(dev->mtu))
1624 break;
1625 /* disable IP when MTU is not enough */
1626 fallthrough;
1627 case NETDEV_UNREGISTER:
1628 inetdev_destroy(in_dev);
1629 break;
1630 case NETDEV_CHANGENAME:
1631 /* Do not notify about label change, this event is
1632 * not interesting to applications using netlink.
1633 */
1634 inetdev_changename(dev, in_dev);
1635
1636 devinet_sysctl_unregister(in_dev);
1637 devinet_sysctl_register(in_dev);
1638 break;
1639 }
1640out:
1641 return NOTIFY_DONE;
1642}
1643
1644static struct notifier_block ip_netdev_notifier = {
1645 .notifier_call = inetdev_event,
1646};
1647
1648static size_t inet_nlmsg_size(void)
1649{
1650 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
1651 + nla_total_size(4) /* IFA_ADDRESS */
1652 + nla_total_size(4) /* IFA_LOCAL */
1653 + nla_total_size(4) /* IFA_BROADCAST */
1654 + nla_total_size(IFNAMSIZ) /* IFA_LABEL */
1655 + nla_total_size(4) /* IFA_FLAGS */
1656 + nla_total_size(1) /* IFA_PROTO */
1657 + nla_total_size(4) /* IFA_RT_PRIORITY */
1658 + nla_total_size(sizeof(struct ifa_cacheinfo)); /* IFA_CACHEINFO */
1659}
1660
1661static inline u32 cstamp_delta(unsigned long cstamp)
1662{
1663 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
1664}
1665
1666static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
1667 unsigned long tstamp, u32 preferred, u32 valid)
1668{
1669 struct ifa_cacheinfo ci;
1670
1671 ci.cstamp = cstamp_delta(cstamp);
1672 ci.tstamp = cstamp_delta(tstamp);
1673 ci.ifa_prefered = preferred;
1674 ci.ifa_valid = valid;
1675
1676 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
1677}
1678
1679static int inet_fill_ifaddr(struct sk_buff *skb, const struct in_ifaddr *ifa,
1680 struct inet_fill_args *args)
1681{
1682 struct ifaddrmsg *ifm;
1683 struct nlmsghdr *nlh;
1684 unsigned long tstamp;
1685 u32 preferred, valid;
1686 u32 flags;
1687
1688 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, sizeof(*ifm),
1689 args->flags);
1690 if (!nlh)
1691 return -EMSGSIZE;
1692
1693 ifm = nlmsg_data(nlh);
1694 ifm->ifa_family = AF_INET;
1695 ifm->ifa_prefixlen = ifa->ifa_prefixlen;
1696
1697 flags = READ_ONCE(ifa->ifa_flags);
1698 /* Warning : ifm->ifa_flags is an __u8, it holds only 8 bits.
1699 * The 32bit value is given in IFA_FLAGS attribute.
1700 */
1701 ifm->ifa_flags = (__u8)flags;
1702
1703 ifm->ifa_scope = ifa->ifa_scope;
1704 ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
1705
1706 if (args->netnsid >= 0 &&
1707 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid))
1708 goto nla_put_failure;
1709
1710 tstamp = READ_ONCE(ifa->ifa_tstamp);
1711 if (!(flags & IFA_F_PERMANENT)) {
1712 preferred = READ_ONCE(ifa->ifa_preferred_lft);
1713 valid = READ_ONCE(ifa->ifa_valid_lft);
1714 if (preferred != INFINITY_LIFE_TIME) {
1715 long tval = (jiffies - tstamp) / HZ;
1716
1717 if (preferred > tval)
1718 preferred -= tval;
1719 else
1720 preferred = 0;
1721 if (valid != INFINITY_LIFE_TIME) {
1722 if (valid > tval)
1723 valid -= tval;
1724 else
1725 valid = 0;
1726 }
1727 }
1728 } else {
1729 preferred = INFINITY_LIFE_TIME;
1730 valid = INFINITY_LIFE_TIME;
1731 }
1732 if ((ifa->ifa_address &&
1733 nla_put_in_addr(skb, IFA_ADDRESS, ifa->ifa_address)) ||
1734 (ifa->ifa_local &&
1735 nla_put_in_addr(skb, IFA_LOCAL, ifa->ifa_local)) ||
1736 (ifa->ifa_broadcast &&
1737 nla_put_in_addr(skb, IFA_BROADCAST, ifa->ifa_broadcast)) ||
1738 (ifa->ifa_label[0] &&
1739 nla_put_string(skb, IFA_LABEL, ifa->ifa_label)) ||
1740 (ifa->ifa_proto &&
1741 nla_put_u8(skb, IFA_PROTO, ifa->ifa_proto)) ||
1742 nla_put_u32(skb, IFA_FLAGS, flags) ||
1743 (ifa->ifa_rt_priority &&
1744 nla_put_u32(skb, IFA_RT_PRIORITY, ifa->ifa_rt_priority)) ||
1745 put_cacheinfo(skb, READ_ONCE(ifa->ifa_cstamp), tstamp,
1746 preferred, valid))
1747 goto nla_put_failure;
1748
1749 nlmsg_end(skb, nlh);
1750 return 0;
1751
1752nla_put_failure:
1753 nlmsg_cancel(skb, nlh);
1754 return -EMSGSIZE;
1755}
1756
1757static int inet_valid_dump_ifaddr_req(const struct nlmsghdr *nlh,
1758 struct inet_fill_args *fillargs,
1759 struct net **tgt_net, struct sock *sk,
1760 struct netlink_callback *cb)
1761{
1762 struct netlink_ext_ack *extack = cb->extack;
1763 struct nlattr *tb[IFA_MAX+1];
1764 struct ifaddrmsg *ifm;
1765 int err, i;
1766
1767 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
1768 NL_SET_ERR_MSG(extack, "ipv4: Invalid header for address dump request");
1769 return -EINVAL;
1770 }
1771
1772 ifm = nlmsg_data(nlh);
1773 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
1774 NL_SET_ERR_MSG(extack, "ipv4: Invalid values in header for address dump request");
1775 return -EINVAL;
1776 }
1777
1778 fillargs->ifindex = ifm->ifa_index;
1779 if (fillargs->ifindex) {
1780 cb->answer_flags |= NLM_F_DUMP_FILTERED;
1781 fillargs->flags |= NLM_F_DUMP_FILTERED;
1782 }
1783
1784 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
1785 ifa_ipv4_policy, extack);
1786 if (err < 0)
1787 return err;
1788
1789 for (i = 0; i <= IFA_MAX; ++i) {
1790 if (!tb[i])
1791 continue;
1792
1793 if (i == IFA_TARGET_NETNSID) {
1794 struct net *net;
1795
1796 fillargs->netnsid = nla_get_s32(tb[i]);
1797
1798 net = rtnl_get_net_ns_capable(sk, fillargs->netnsid);
1799 if (IS_ERR(net)) {
1800 fillargs->netnsid = -1;
1801 NL_SET_ERR_MSG(extack, "ipv4: Invalid target network namespace id");
1802 return PTR_ERR(net);
1803 }
1804 *tgt_net = net;
1805 } else {
1806 NL_SET_ERR_MSG(extack, "ipv4: Unsupported attribute in dump request");
1807 return -EINVAL;
1808 }
1809 }
1810
1811 return 0;
1812}
1813
1814static int in_dev_dump_addr(struct in_device *in_dev, struct sk_buff *skb,
1815 struct netlink_callback *cb, int *s_ip_idx,
1816 struct inet_fill_args *fillargs)
1817{
1818 struct in_ifaddr *ifa;
1819 int ip_idx = 0;
1820 int err;
1821
1822 in_dev_for_each_ifa_rcu(ifa, in_dev) {
1823 if (ip_idx < *s_ip_idx) {
1824 ip_idx++;
1825 continue;
1826 }
1827 err = inet_fill_ifaddr(skb, ifa, fillargs);
1828 if (err < 0)
1829 goto done;
1830
1831 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1832 ip_idx++;
1833 }
1834 err = 0;
1835 ip_idx = 0;
1836done:
1837 *s_ip_idx = ip_idx;
1838
1839 return err;
1840}
1841
1842/* Combine dev_addr_genid and dev_base_seq to detect changes.
1843 */
1844static u32 inet_base_seq(const struct net *net)
1845{
1846 u32 res = atomic_read(&net->ipv4.dev_addr_genid) +
1847 READ_ONCE(net->dev_base_seq);
1848
1849 /* Must not return 0 (see nl_dump_check_consistent()).
1850 * Chose a value far away from 0.
1851 */
1852 if (!res)
1853 res = 0x80000000;
1854 return res;
1855}
1856
1857static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
1858{
1859 const struct nlmsghdr *nlh = cb->nlh;
1860 struct inet_fill_args fillargs = {
1861 .portid = NETLINK_CB(cb->skb).portid,
1862 .seq = nlh->nlmsg_seq,
1863 .event = RTM_NEWADDR,
1864 .flags = NLM_F_MULTI,
1865 .netnsid = -1,
1866 };
1867 struct net *net = sock_net(skb->sk);
1868 struct net *tgt_net = net;
1869 struct {
1870 unsigned long ifindex;
1871 int ip_idx;
1872 } *ctx = (void *)cb->ctx;
1873 struct in_device *in_dev;
1874 struct net_device *dev;
1875 int err = 0;
1876
1877 rcu_read_lock();
1878 if (cb->strict_check) {
1879 err = inet_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net,
1880 skb->sk, cb);
1881 if (err < 0)
1882 goto done;
1883
1884 if (fillargs.ifindex) {
1885 dev = dev_get_by_index_rcu(tgt_net, fillargs.ifindex);
1886 if (!dev) {
1887 err = -ENODEV;
1888 goto done;
1889 }
1890 in_dev = __in_dev_get_rcu(dev);
1891 if (!in_dev)
1892 goto done;
1893 err = in_dev_dump_addr(in_dev, skb, cb, &ctx->ip_idx,
1894 &fillargs);
1895 goto done;
1896 }
1897 }
1898
1899 cb->seq = inet_base_seq(tgt_net);
1900
1901 for_each_netdev_dump(tgt_net, dev, ctx->ifindex) {
1902 in_dev = __in_dev_get_rcu(dev);
1903 if (!in_dev)
1904 continue;
1905 err = in_dev_dump_addr(in_dev, skb, cb, &ctx->ip_idx,
1906 &fillargs);
1907 if (err < 0)
1908 goto done;
1909 }
1910done:
1911 if (fillargs.netnsid >= 0)
1912 put_net(tgt_net);
1913 rcu_read_unlock();
1914 return err;
1915}
1916
1917static void rtmsg_ifa(int event, struct in_ifaddr *ifa, struct nlmsghdr *nlh,
1918 u32 portid)
1919{
1920 struct inet_fill_args fillargs = {
1921 .portid = portid,
1922 .seq = nlh ? nlh->nlmsg_seq : 0,
1923 .event = event,
1924 .flags = 0,
1925 .netnsid = -1,
1926 };
1927 struct sk_buff *skb;
1928 int err = -ENOBUFS;
1929 struct net *net;
1930
1931 net = dev_net(ifa->ifa_dev->dev);
1932 skb = nlmsg_new(inet_nlmsg_size(), GFP_KERNEL);
1933 if (!skb)
1934 goto errout;
1935
1936 err = inet_fill_ifaddr(skb, ifa, &fillargs);
1937 if (err < 0) {
1938 /* -EMSGSIZE implies BUG in inet_nlmsg_size() */
1939 WARN_ON(err == -EMSGSIZE);
1940 kfree_skb(skb);
1941 goto errout;
1942 }
1943 rtnl_notify(skb, net, portid, RTNLGRP_IPV4_IFADDR, nlh, GFP_KERNEL);
1944 return;
1945errout:
1946 if (err < 0)
1947 rtnl_set_sk_err(net, RTNLGRP_IPV4_IFADDR, err);
1948}
1949
1950static size_t inet_get_link_af_size(const struct net_device *dev,
1951 u32 ext_filter_mask)
1952{
1953 struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr);
1954
1955 if (!in_dev)
1956 return 0;
1957
1958 return nla_total_size(IPV4_DEVCONF_MAX * 4); /* IFLA_INET_CONF */
1959}
1960
1961static int inet_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
1962 u32 ext_filter_mask)
1963{
1964 struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr);
1965 struct nlattr *nla;
1966 int i;
1967
1968 if (!in_dev)
1969 return -ENODATA;
1970
1971 nla = nla_reserve(skb, IFLA_INET_CONF, IPV4_DEVCONF_MAX * 4);
1972 if (!nla)
1973 return -EMSGSIZE;
1974
1975 for (i = 0; i < IPV4_DEVCONF_MAX; i++)
1976 ((u32 *) nla_data(nla))[i] = READ_ONCE(in_dev->cnf.data[i]);
1977
1978 return 0;
1979}
1980
1981static const struct nla_policy inet_af_policy[IFLA_INET_MAX+1] = {
1982 [IFLA_INET_CONF] = { .type = NLA_NESTED },
1983};
1984
1985static int inet_validate_link_af(const struct net_device *dev,
1986 const struct nlattr *nla,
1987 struct netlink_ext_ack *extack)
1988{
1989 struct nlattr *a, *tb[IFLA_INET_MAX+1];
1990 int err, rem;
1991
1992 if (dev && !__in_dev_get_rtnl(dev))
1993 return -EAFNOSUPPORT;
1994
1995 err = nla_parse_nested_deprecated(tb, IFLA_INET_MAX, nla,
1996 inet_af_policy, extack);
1997 if (err < 0)
1998 return err;
1999
2000 if (tb[IFLA_INET_CONF]) {
2001 nla_for_each_nested(a, tb[IFLA_INET_CONF], rem) {
2002 int cfgid = nla_type(a);
2003
2004 if (nla_len(a) < 4)
2005 return -EINVAL;
2006
2007 if (cfgid <= 0 || cfgid > IPV4_DEVCONF_MAX)
2008 return -EINVAL;
2009 }
2010 }
2011
2012 return 0;
2013}
2014
2015static int inet_set_link_af(struct net_device *dev, const struct nlattr *nla,
2016 struct netlink_ext_ack *extack)
2017{
2018 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2019 struct nlattr *a, *tb[IFLA_INET_MAX+1];
2020 int rem;
2021
2022 if (!in_dev)
2023 return -EAFNOSUPPORT;
2024
2025 if (nla_parse_nested_deprecated(tb, IFLA_INET_MAX, nla, NULL, NULL) < 0)
2026 return -EINVAL;
2027
2028 if (tb[IFLA_INET_CONF]) {
2029 nla_for_each_nested(a, tb[IFLA_INET_CONF], rem)
2030 ipv4_devconf_set(in_dev, nla_type(a), nla_get_u32(a));
2031 }
2032
2033 return 0;
2034}
2035
2036static int inet_netconf_msgsize_devconf(int type)
2037{
2038 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
2039 + nla_total_size(4); /* NETCONFA_IFINDEX */
2040 bool all = false;
2041
2042 if (type == NETCONFA_ALL)
2043 all = true;
2044
2045 if (all || type == NETCONFA_FORWARDING)
2046 size += nla_total_size(4);
2047 if (all || type == NETCONFA_RP_FILTER)
2048 size += nla_total_size(4);
2049 if (all || type == NETCONFA_MC_FORWARDING)
2050 size += nla_total_size(4);
2051 if (all || type == NETCONFA_BC_FORWARDING)
2052 size += nla_total_size(4);
2053 if (all || type == NETCONFA_PROXY_NEIGH)
2054 size += nla_total_size(4);
2055 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
2056 size += nla_total_size(4);
2057
2058 return size;
2059}
2060
2061static int inet_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
2062 const struct ipv4_devconf *devconf,
2063 u32 portid, u32 seq, int event,
2064 unsigned int flags, int type)
2065{
2066 struct nlmsghdr *nlh;
2067 struct netconfmsg *ncm;
2068 bool all = false;
2069
2070 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
2071 flags);
2072 if (!nlh)
2073 return -EMSGSIZE;
2074
2075 if (type == NETCONFA_ALL)
2076 all = true;
2077
2078 ncm = nlmsg_data(nlh);
2079 ncm->ncm_family = AF_INET;
2080
2081 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
2082 goto nla_put_failure;
2083
2084 if (!devconf)
2085 goto out;
2086
2087 if ((all || type == NETCONFA_FORWARDING) &&
2088 nla_put_s32(skb, NETCONFA_FORWARDING,
2089 IPV4_DEVCONF_RO(*devconf, FORWARDING)) < 0)
2090 goto nla_put_failure;
2091 if ((all || type == NETCONFA_RP_FILTER) &&
2092 nla_put_s32(skb, NETCONFA_RP_FILTER,
2093 IPV4_DEVCONF_RO(*devconf, RP_FILTER)) < 0)
2094 goto nla_put_failure;
2095 if ((all || type == NETCONFA_MC_FORWARDING) &&
2096 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
2097 IPV4_DEVCONF_RO(*devconf, MC_FORWARDING)) < 0)
2098 goto nla_put_failure;
2099 if ((all || type == NETCONFA_BC_FORWARDING) &&
2100 nla_put_s32(skb, NETCONFA_BC_FORWARDING,
2101 IPV4_DEVCONF_RO(*devconf, BC_FORWARDING)) < 0)
2102 goto nla_put_failure;
2103 if ((all || type == NETCONFA_PROXY_NEIGH) &&
2104 nla_put_s32(skb, NETCONFA_PROXY_NEIGH,
2105 IPV4_DEVCONF_RO(*devconf, PROXY_ARP)) < 0)
2106 goto nla_put_failure;
2107 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
2108 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
2109 IPV4_DEVCONF_RO(*devconf,
2110 IGNORE_ROUTES_WITH_LINKDOWN)) < 0)
2111 goto nla_put_failure;
2112
2113out:
2114 nlmsg_end(skb, nlh);
2115 return 0;
2116
2117nla_put_failure:
2118 nlmsg_cancel(skb, nlh);
2119 return -EMSGSIZE;
2120}
2121
2122void inet_netconf_notify_devconf(struct net *net, int event, int type,
2123 int ifindex, struct ipv4_devconf *devconf)
2124{
2125 struct sk_buff *skb;
2126 int err = -ENOBUFS;
2127
2128 skb = nlmsg_new(inet_netconf_msgsize_devconf(type), GFP_KERNEL);
2129 if (!skb)
2130 goto errout;
2131
2132 err = inet_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
2133 event, 0, type);
2134 if (err < 0) {
2135 /* -EMSGSIZE implies BUG in inet_netconf_msgsize_devconf() */
2136 WARN_ON(err == -EMSGSIZE);
2137 kfree_skb(skb);
2138 goto errout;
2139 }
2140 rtnl_notify(skb, net, 0, RTNLGRP_IPV4_NETCONF, NULL, GFP_KERNEL);
2141 return;
2142errout:
2143 if (err < 0)
2144 rtnl_set_sk_err(net, RTNLGRP_IPV4_NETCONF, err);
2145}
2146
2147static const struct nla_policy devconf_ipv4_policy[NETCONFA_MAX+1] = {
2148 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
2149 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
2150 [NETCONFA_RP_FILTER] = { .len = sizeof(int) },
2151 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
2152 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
2153};
2154
2155static int inet_netconf_valid_get_req(struct sk_buff *skb,
2156 const struct nlmsghdr *nlh,
2157 struct nlattr **tb,
2158 struct netlink_ext_ack *extack)
2159{
2160 int i, err;
2161
2162 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) {
2163 NL_SET_ERR_MSG(extack, "ipv4: Invalid header for netconf get request");
2164 return -EINVAL;
2165 }
2166
2167 if (!netlink_strict_get_check(skb))
2168 return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg),
2169 tb, NETCONFA_MAX,
2170 devconf_ipv4_policy, extack);
2171
2172 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg),
2173 tb, NETCONFA_MAX,
2174 devconf_ipv4_policy, extack);
2175 if (err)
2176 return err;
2177
2178 for (i = 0; i <= NETCONFA_MAX; i++) {
2179 if (!tb[i])
2180 continue;
2181
2182 switch (i) {
2183 case NETCONFA_IFINDEX:
2184 break;
2185 default:
2186 NL_SET_ERR_MSG(extack, "ipv4: Unsupported attribute in netconf get request");
2187 return -EINVAL;
2188 }
2189 }
2190
2191 return 0;
2192}
2193
2194static int inet_netconf_get_devconf(struct sk_buff *in_skb,
2195 struct nlmsghdr *nlh,
2196 struct netlink_ext_ack *extack)
2197{
2198 struct net *net = sock_net(in_skb->sk);
2199 struct nlattr *tb[NETCONFA_MAX + 1];
2200 const struct ipv4_devconf *devconf;
2201 struct in_device *in_dev = NULL;
2202 struct net_device *dev = NULL;
2203 struct sk_buff *skb;
2204 int ifindex;
2205 int err;
2206
2207 err = inet_netconf_valid_get_req(in_skb, nlh, tb, extack);
2208 if (err)
2209 return err;
2210
2211 if (!tb[NETCONFA_IFINDEX])
2212 return -EINVAL;
2213
2214 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
2215 switch (ifindex) {
2216 case NETCONFA_IFINDEX_ALL:
2217 devconf = net->ipv4.devconf_all;
2218 break;
2219 case NETCONFA_IFINDEX_DEFAULT:
2220 devconf = net->ipv4.devconf_dflt;
2221 break;
2222 default:
2223 err = -ENODEV;
2224 dev = dev_get_by_index(net, ifindex);
2225 if (dev)
2226 in_dev = in_dev_get(dev);
2227 if (!in_dev)
2228 goto errout;
2229 devconf = &in_dev->cnf;
2230 break;
2231 }
2232
2233 err = -ENOBUFS;
2234 skb = nlmsg_new(inet_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL);
2235 if (!skb)
2236 goto errout;
2237
2238 err = inet_netconf_fill_devconf(skb, ifindex, devconf,
2239 NETLINK_CB(in_skb).portid,
2240 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
2241 NETCONFA_ALL);
2242 if (err < 0) {
2243 /* -EMSGSIZE implies BUG in inet_netconf_msgsize_devconf() */
2244 WARN_ON(err == -EMSGSIZE);
2245 kfree_skb(skb);
2246 goto errout;
2247 }
2248 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
2249errout:
2250 if (in_dev)
2251 in_dev_put(in_dev);
2252 dev_put(dev);
2253 return err;
2254}
2255
2256static int inet_netconf_dump_devconf(struct sk_buff *skb,
2257 struct netlink_callback *cb)
2258{
2259 const struct nlmsghdr *nlh = cb->nlh;
2260 struct net *net = sock_net(skb->sk);
2261 struct {
2262 unsigned long ifindex;
2263 unsigned int all_default;
2264 } *ctx = (void *)cb->ctx;
2265 const struct in_device *in_dev;
2266 struct net_device *dev;
2267 int err = 0;
2268
2269 if (cb->strict_check) {
2270 struct netlink_ext_ack *extack = cb->extack;
2271 struct netconfmsg *ncm;
2272
2273 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) {
2274 NL_SET_ERR_MSG(extack, "ipv4: Invalid header for netconf dump request");
2275 return -EINVAL;
2276 }
2277
2278 if (nlmsg_attrlen(nlh, sizeof(*ncm))) {
2279 NL_SET_ERR_MSG(extack, "ipv4: Invalid data after header in netconf dump request");
2280 return -EINVAL;
2281 }
2282 }
2283
2284 rcu_read_lock();
2285 for_each_netdev_dump(net, dev, ctx->ifindex) {
2286 in_dev = __in_dev_get_rcu(dev);
2287 if (!in_dev)
2288 continue;
2289 err = inet_netconf_fill_devconf(skb, dev->ifindex,
2290 &in_dev->cnf,
2291 NETLINK_CB(cb->skb).portid,
2292 nlh->nlmsg_seq,
2293 RTM_NEWNETCONF, NLM_F_MULTI,
2294 NETCONFA_ALL);
2295 if (err < 0)
2296 goto done;
2297 }
2298 if (ctx->all_default == 0) {
2299 err = inet_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
2300 net->ipv4.devconf_all,
2301 NETLINK_CB(cb->skb).portid,
2302 nlh->nlmsg_seq,
2303 RTM_NEWNETCONF, NLM_F_MULTI,
2304 NETCONFA_ALL);
2305 if (err < 0)
2306 goto done;
2307 ctx->all_default++;
2308 }
2309 if (ctx->all_default == 1) {
2310 err = inet_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
2311 net->ipv4.devconf_dflt,
2312 NETLINK_CB(cb->skb).portid,
2313 nlh->nlmsg_seq,
2314 RTM_NEWNETCONF, NLM_F_MULTI,
2315 NETCONFA_ALL);
2316 if (err < 0)
2317 goto done;
2318 ctx->all_default++;
2319 }
2320done:
2321 rcu_read_unlock();
2322 return err;
2323}
2324
2325#ifdef CONFIG_SYSCTL
2326
2327static void devinet_copy_dflt_conf(struct net *net, int i)
2328{
2329 struct net_device *dev;
2330
2331 rcu_read_lock();
2332 for_each_netdev_rcu(net, dev) {
2333 struct in_device *in_dev;
2334
2335 in_dev = __in_dev_get_rcu(dev);
2336 if (in_dev && !test_bit(i, in_dev->cnf.state))
2337 in_dev->cnf.data[i] = net->ipv4.devconf_dflt->data[i];
2338 }
2339 rcu_read_unlock();
2340}
2341
2342/* called with RTNL locked */
2343static void inet_forward_change(struct net *net)
2344{
2345 struct net_device *dev;
2346 int on = IPV4_DEVCONF_ALL(net, FORWARDING);
2347
2348 IPV4_DEVCONF_ALL(net, ACCEPT_REDIRECTS) = !on;
2349 IPV4_DEVCONF_DFLT(net, FORWARDING) = on;
2350 inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
2351 NETCONFA_FORWARDING,
2352 NETCONFA_IFINDEX_ALL,
2353 net->ipv4.devconf_all);
2354 inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
2355 NETCONFA_FORWARDING,
2356 NETCONFA_IFINDEX_DEFAULT,
2357 net->ipv4.devconf_dflt);
2358
2359 for_each_netdev(net, dev) {
2360 struct in_device *in_dev;
2361
2362 if (on)
2363 dev_disable_lro(dev);
2364
2365 in_dev = __in_dev_get_rtnl(dev);
2366 if (in_dev) {
2367 IN_DEV_CONF_SET(in_dev, FORWARDING, on);
2368 inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
2369 NETCONFA_FORWARDING,
2370 dev->ifindex, &in_dev->cnf);
2371 }
2372 }
2373}
2374
2375static int devinet_conf_ifindex(struct net *net, struct ipv4_devconf *cnf)
2376{
2377 if (cnf == net->ipv4.devconf_dflt)
2378 return NETCONFA_IFINDEX_DEFAULT;
2379 else if (cnf == net->ipv4.devconf_all)
2380 return NETCONFA_IFINDEX_ALL;
2381 else {
2382 struct in_device *idev
2383 = container_of(cnf, struct in_device, cnf);
2384 return idev->dev->ifindex;
2385 }
2386}
2387
2388static int devinet_conf_proc(struct ctl_table *ctl, int write,
2389 void *buffer, size_t *lenp, loff_t *ppos)
2390{
2391 int old_value = *(int *)ctl->data;
2392 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
2393 int new_value = *(int *)ctl->data;
2394
2395 if (write) {
2396 struct ipv4_devconf *cnf = ctl->extra1;
2397 struct net *net = ctl->extra2;
2398 int i = (int *)ctl->data - cnf->data;
2399 int ifindex;
2400
2401 set_bit(i, cnf->state);
2402
2403 if (cnf == net->ipv4.devconf_dflt)
2404 devinet_copy_dflt_conf(net, i);
2405 if (i == IPV4_DEVCONF_ACCEPT_LOCAL - 1 ||
2406 i == IPV4_DEVCONF_ROUTE_LOCALNET - 1)
2407 if ((new_value == 0) && (old_value != 0))
2408 rt_cache_flush(net);
2409
2410 if (i == IPV4_DEVCONF_BC_FORWARDING - 1 &&
2411 new_value != old_value)
2412 rt_cache_flush(net);
2413
2414 if (i == IPV4_DEVCONF_RP_FILTER - 1 &&
2415 new_value != old_value) {
2416 ifindex = devinet_conf_ifindex(net, cnf);
2417 inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
2418 NETCONFA_RP_FILTER,
2419 ifindex, cnf);
2420 }
2421 if (i == IPV4_DEVCONF_PROXY_ARP - 1 &&
2422 new_value != old_value) {
2423 ifindex = devinet_conf_ifindex(net, cnf);
2424 inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
2425 NETCONFA_PROXY_NEIGH,
2426 ifindex, cnf);
2427 }
2428 if (i == IPV4_DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN - 1 &&
2429 new_value != old_value) {
2430 ifindex = devinet_conf_ifindex(net, cnf);
2431 inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
2432 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
2433 ifindex, cnf);
2434 }
2435 }
2436
2437 return ret;
2438}
2439
2440static int devinet_sysctl_forward(struct ctl_table *ctl, int write,
2441 void *buffer, size_t *lenp, loff_t *ppos)
2442{
2443 int *valp = ctl->data;
2444 int val = *valp;
2445 loff_t pos = *ppos;
2446 struct net *net = ctl->extra2;
2447 int ret;
2448
2449 if (write && !ns_capable(net->user_ns, CAP_NET_ADMIN))
2450 return -EPERM;
2451
2452 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
2453
2454 if (write && *valp != val) {
2455 if (valp != &IPV4_DEVCONF_DFLT(net, FORWARDING)) {
2456 if (!rtnl_trylock()) {
2457 /* Restore the original values before restarting */
2458 *valp = val;
2459 *ppos = pos;
2460 return restart_syscall();
2461 }
2462 if (valp == &IPV4_DEVCONF_ALL(net, FORWARDING)) {
2463 inet_forward_change(net);
2464 } else {
2465 struct ipv4_devconf *cnf = ctl->extra1;
2466 struct in_device *idev =
2467 container_of(cnf, struct in_device, cnf);
2468 if (*valp)
2469 dev_disable_lro(idev->dev);
2470 inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
2471 NETCONFA_FORWARDING,
2472 idev->dev->ifindex,
2473 cnf);
2474 }
2475 rtnl_unlock();
2476 rt_cache_flush(net);
2477 } else
2478 inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
2479 NETCONFA_FORWARDING,
2480 NETCONFA_IFINDEX_DEFAULT,
2481 net->ipv4.devconf_dflt);
2482 }
2483
2484 return ret;
2485}
2486
2487static int ipv4_doint_and_flush(struct ctl_table *ctl, int write,
2488 void *buffer, size_t *lenp, loff_t *ppos)
2489{
2490 int *valp = ctl->data;
2491 int val = *valp;
2492 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
2493 struct net *net = ctl->extra2;
2494
2495 if (write && *valp != val)
2496 rt_cache_flush(net);
2497
2498 return ret;
2499}
2500
2501#define DEVINET_SYSCTL_ENTRY(attr, name, mval, proc) \
2502 { \
2503 .procname = name, \
2504 .data = ipv4_devconf.data + \
2505 IPV4_DEVCONF_ ## attr - 1, \
2506 .maxlen = sizeof(int), \
2507 .mode = mval, \
2508 .proc_handler = proc, \
2509 .extra1 = &ipv4_devconf, \
2510 }
2511
2512#define DEVINET_SYSCTL_RW_ENTRY(attr, name) \
2513 DEVINET_SYSCTL_ENTRY(attr, name, 0644, devinet_conf_proc)
2514
2515#define DEVINET_SYSCTL_RO_ENTRY(attr, name) \
2516 DEVINET_SYSCTL_ENTRY(attr, name, 0444, devinet_conf_proc)
2517
2518#define DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, proc) \
2519 DEVINET_SYSCTL_ENTRY(attr, name, 0644, proc)
2520
2521#define DEVINET_SYSCTL_FLUSHING_ENTRY(attr, name) \
2522 DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, ipv4_doint_and_flush)
2523
2524static struct devinet_sysctl_table {
2525 struct ctl_table_header *sysctl_header;
2526 struct ctl_table devinet_vars[__IPV4_DEVCONF_MAX];
2527} devinet_sysctl = {
2528 .devinet_vars = {
2529 DEVINET_SYSCTL_COMPLEX_ENTRY(FORWARDING, "forwarding",
2530 devinet_sysctl_forward),
2531 DEVINET_SYSCTL_RO_ENTRY(MC_FORWARDING, "mc_forwarding"),
2532 DEVINET_SYSCTL_RW_ENTRY(BC_FORWARDING, "bc_forwarding"),
2533
2534 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_REDIRECTS, "accept_redirects"),
2535 DEVINET_SYSCTL_RW_ENTRY(SECURE_REDIRECTS, "secure_redirects"),
2536 DEVINET_SYSCTL_RW_ENTRY(SHARED_MEDIA, "shared_media"),
2537 DEVINET_SYSCTL_RW_ENTRY(RP_FILTER, "rp_filter"),
2538 DEVINET_SYSCTL_RW_ENTRY(SEND_REDIRECTS, "send_redirects"),
2539 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_SOURCE_ROUTE,
2540 "accept_source_route"),
2541 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_LOCAL, "accept_local"),
2542 DEVINET_SYSCTL_RW_ENTRY(SRC_VMARK, "src_valid_mark"),
2543 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP, "proxy_arp"),
2544 DEVINET_SYSCTL_RW_ENTRY(MEDIUM_ID, "medium_id"),
2545 DEVINET_SYSCTL_RW_ENTRY(BOOTP_RELAY, "bootp_relay"),
2546 DEVINET_SYSCTL_RW_ENTRY(LOG_MARTIANS, "log_martians"),
2547 DEVINET_SYSCTL_RW_ENTRY(TAG, "tag"),
2548 DEVINET_SYSCTL_RW_ENTRY(ARPFILTER, "arp_filter"),
2549 DEVINET_SYSCTL_RW_ENTRY(ARP_ANNOUNCE, "arp_announce"),
2550 DEVINET_SYSCTL_RW_ENTRY(ARP_IGNORE, "arp_ignore"),
2551 DEVINET_SYSCTL_RW_ENTRY(ARP_ACCEPT, "arp_accept"),
2552 DEVINET_SYSCTL_RW_ENTRY(ARP_NOTIFY, "arp_notify"),
2553 DEVINET_SYSCTL_RW_ENTRY(ARP_EVICT_NOCARRIER,
2554 "arp_evict_nocarrier"),
2555 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP_PVLAN, "proxy_arp_pvlan"),
2556 DEVINET_SYSCTL_RW_ENTRY(FORCE_IGMP_VERSION,
2557 "force_igmp_version"),
2558 DEVINET_SYSCTL_RW_ENTRY(IGMPV2_UNSOLICITED_REPORT_INTERVAL,
2559 "igmpv2_unsolicited_report_interval"),
2560 DEVINET_SYSCTL_RW_ENTRY(IGMPV3_UNSOLICITED_REPORT_INTERVAL,
2561 "igmpv3_unsolicited_report_interval"),
2562 DEVINET_SYSCTL_RW_ENTRY(IGNORE_ROUTES_WITH_LINKDOWN,
2563 "ignore_routes_with_linkdown"),
2564 DEVINET_SYSCTL_RW_ENTRY(DROP_GRATUITOUS_ARP,
2565 "drop_gratuitous_arp"),
2566
2567 DEVINET_SYSCTL_FLUSHING_ENTRY(NOXFRM, "disable_xfrm"),
2568 DEVINET_SYSCTL_FLUSHING_ENTRY(NOPOLICY, "disable_policy"),
2569 DEVINET_SYSCTL_FLUSHING_ENTRY(PROMOTE_SECONDARIES,
2570 "promote_secondaries"),
2571 DEVINET_SYSCTL_FLUSHING_ENTRY(ROUTE_LOCALNET,
2572 "route_localnet"),
2573 DEVINET_SYSCTL_FLUSHING_ENTRY(DROP_UNICAST_IN_L2_MULTICAST,
2574 "drop_unicast_in_l2_multicast"),
2575 },
2576};
2577
2578static int __devinet_sysctl_register(struct net *net, char *dev_name,
2579 int ifindex, struct ipv4_devconf *p)
2580{
2581 int i;
2582 struct devinet_sysctl_table *t;
2583 char path[sizeof("net/ipv4/conf/") + IFNAMSIZ];
2584
2585 t = kmemdup(&devinet_sysctl, sizeof(*t), GFP_KERNEL_ACCOUNT);
2586 if (!t)
2587 goto out;
2588
2589 for (i = 0; i < ARRAY_SIZE(t->devinet_vars) - 1; i++) {
2590 t->devinet_vars[i].data += (char *)p - (char *)&ipv4_devconf;
2591 t->devinet_vars[i].extra1 = p;
2592 t->devinet_vars[i].extra2 = net;
2593 }
2594
2595 snprintf(path, sizeof(path), "net/ipv4/conf/%s", dev_name);
2596
2597 t->sysctl_header = register_net_sysctl(net, path, t->devinet_vars);
2598 if (!t->sysctl_header)
2599 goto free;
2600
2601 p->sysctl = t;
2602
2603 inet_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
2604 ifindex, p);
2605 return 0;
2606
2607free:
2608 kfree(t);
2609out:
2610 return -ENOMEM;
2611}
2612
2613static void __devinet_sysctl_unregister(struct net *net,
2614 struct ipv4_devconf *cnf, int ifindex)
2615{
2616 struct devinet_sysctl_table *t = cnf->sysctl;
2617
2618 if (t) {
2619 cnf->sysctl = NULL;
2620 unregister_net_sysctl_table(t->sysctl_header);
2621 kfree(t);
2622 }
2623
2624 inet_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
2625}
2626
2627static int devinet_sysctl_register(struct in_device *idev)
2628{
2629 int err;
2630
2631 if (!sysctl_dev_name_is_allowed(idev->dev->name))
2632 return -EINVAL;
2633
2634 err = neigh_sysctl_register(idev->dev, idev->arp_parms, NULL);
2635 if (err)
2636 return err;
2637 err = __devinet_sysctl_register(dev_net(idev->dev), idev->dev->name,
2638 idev->dev->ifindex, &idev->cnf);
2639 if (err)
2640 neigh_sysctl_unregister(idev->arp_parms);
2641 return err;
2642}
2643
2644static void devinet_sysctl_unregister(struct in_device *idev)
2645{
2646 struct net *net = dev_net(idev->dev);
2647
2648 __devinet_sysctl_unregister(net, &idev->cnf, idev->dev->ifindex);
2649 neigh_sysctl_unregister(idev->arp_parms);
2650}
2651
2652static struct ctl_table ctl_forward_entry[] = {
2653 {
2654 .procname = "ip_forward",
2655 .data = &ipv4_devconf.data[
2656 IPV4_DEVCONF_FORWARDING - 1],
2657 .maxlen = sizeof(int),
2658 .mode = 0644,
2659 .proc_handler = devinet_sysctl_forward,
2660 .extra1 = &ipv4_devconf,
2661 .extra2 = &init_net,
2662 },
2663 { },
2664};
2665#endif
2666
2667static __net_init int devinet_init_net(struct net *net)
2668{
2669 int err;
2670 struct ipv4_devconf *all, *dflt;
2671#ifdef CONFIG_SYSCTL
2672 struct ctl_table *tbl;
2673 struct ctl_table_header *forw_hdr;
2674#endif
2675
2676 err = -ENOMEM;
2677 all = kmemdup(&ipv4_devconf, sizeof(ipv4_devconf), GFP_KERNEL);
2678 if (!all)
2679 goto err_alloc_all;
2680
2681 dflt = kmemdup(&ipv4_devconf_dflt, sizeof(ipv4_devconf_dflt), GFP_KERNEL);
2682 if (!dflt)
2683 goto err_alloc_dflt;
2684
2685#ifdef CONFIG_SYSCTL
2686 tbl = kmemdup(ctl_forward_entry, sizeof(ctl_forward_entry), GFP_KERNEL);
2687 if (!tbl)
2688 goto err_alloc_ctl;
2689
2690 tbl[0].data = &all->data[IPV4_DEVCONF_FORWARDING - 1];
2691 tbl[0].extra1 = all;
2692 tbl[0].extra2 = net;
2693#endif
2694
2695 if (!net_eq(net, &init_net)) {
2696 switch (net_inherit_devconf()) {
2697 case 3:
2698 /* copy from the current netns */
2699 memcpy(all, current->nsproxy->net_ns->ipv4.devconf_all,
2700 sizeof(ipv4_devconf));
2701 memcpy(dflt,
2702 current->nsproxy->net_ns->ipv4.devconf_dflt,
2703 sizeof(ipv4_devconf_dflt));
2704 break;
2705 case 0:
2706 case 1:
2707 /* copy from init_net */
2708 memcpy(all, init_net.ipv4.devconf_all,
2709 sizeof(ipv4_devconf));
2710 memcpy(dflt, init_net.ipv4.devconf_dflt,
2711 sizeof(ipv4_devconf_dflt));
2712 break;
2713 case 2:
2714 /* use compiled values */
2715 break;
2716 }
2717 }
2718
2719#ifdef CONFIG_SYSCTL
2720 err = __devinet_sysctl_register(net, "all", NETCONFA_IFINDEX_ALL, all);
2721 if (err < 0)
2722 goto err_reg_all;
2723
2724 err = __devinet_sysctl_register(net, "default",
2725 NETCONFA_IFINDEX_DEFAULT, dflt);
2726 if (err < 0)
2727 goto err_reg_dflt;
2728
2729 err = -ENOMEM;
2730 forw_hdr = register_net_sysctl_sz(net, "net/ipv4", tbl,
2731 ARRAY_SIZE(ctl_forward_entry));
2732 if (!forw_hdr)
2733 goto err_reg_ctl;
2734 net->ipv4.forw_hdr = forw_hdr;
2735#endif
2736
2737 net->ipv4.devconf_all = all;
2738 net->ipv4.devconf_dflt = dflt;
2739 return 0;
2740
2741#ifdef CONFIG_SYSCTL
2742err_reg_ctl:
2743 __devinet_sysctl_unregister(net, dflt, NETCONFA_IFINDEX_DEFAULT);
2744err_reg_dflt:
2745 __devinet_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL);
2746err_reg_all:
2747 kfree(tbl);
2748err_alloc_ctl:
2749#endif
2750 kfree(dflt);
2751err_alloc_dflt:
2752 kfree(all);
2753err_alloc_all:
2754 return err;
2755}
2756
2757static __net_exit void devinet_exit_net(struct net *net)
2758{
2759#ifdef CONFIG_SYSCTL
2760 struct ctl_table *tbl;
2761
2762 tbl = net->ipv4.forw_hdr->ctl_table_arg;
2763 unregister_net_sysctl_table(net->ipv4.forw_hdr);
2764 __devinet_sysctl_unregister(net, net->ipv4.devconf_dflt,
2765 NETCONFA_IFINDEX_DEFAULT);
2766 __devinet_sysctl_unregister(net, net->ipv4.devconf_all,
2767 NETCONFA_IFINDEX_ALL);
2768 kfree(tbl);
2769#endif
2770 kfree(net->ipv4.devconf_dflt);
2771 kfree(net->ipv4.devconf_all);
2772}
2773
2774static __net_initdata struct pernet_operations devinet_ops = {
2775 .init = devinet_init_net,
2776 .exit = devinet_exit_net,
2777};
2778
2779static struct rtnl_af_ops inet_af_ops __read_mostly = {
2780 .family = AF_INET,
2781 .fill_link_af = inet_fill_link_af,
2782 .get_link_af_size = inet_get_link_af_size,
2783 .validate_link_af = inet_validate_link_af,
2784 .set_link_af = inet_set_link_af,
2785};
2786
2787void __init devinet_init(void)
2788{
2789 int i;
2790
2791 for (i = 0; i < IN4_ADDR_HSIZE; i++)
2792 INIT_HLIST_HEAD(&inet_addr_lst[i]);
2793
2794 register_pernet_subsys(&devinet_ops);
2795 register_netdevice_notifier(&ip_netdev_notifier);
2796
2797 queue_delayed_work(system_power_efficient_wq, &check_lifetime_work, 0);
2798
2799 rtnl_af_register(&inet_af_ops);
2800
2801 rtnl_register(PF_INET, RTM_NEWADDR, inet_rtm_newaddr, NULL, 0);
2802 rtnl_register(PF_INET, RTM_DELADDR, inet_rtm_deladdr, NULL, 0);
2803 rtnl_register(PF_INET, RTM_GETADDR, NULL, inet_dump_ifaddr,
2804 RTNL_FLAG_DUMP_UNLOCKED);
2805 rtnl_register(PF_INET, RTM_GETNETCONF, inet_netconf_get_devconf,
2806 inet_netconf_dump_devconf,
2807 RTNL_FLAG_DOIT_UNLOCKED | RTNL_FLAG_DUMP_UNLOCKED);
2808}