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Merge branch 'for-airlied' of git://people.freedesktop.org/~danvet/drm-intel into...
[deliverable/linux.git] / net / ipv4 / devinet.c
1 /*
2 * NET3 IP device support routines.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
8 *
9 * Derived from the IP parts of dev.c 1.0.19
10 * Authors: Ross Biro
11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 * Mark Evans, <evansmp@uhura.aston.ac.uk>
13 *
14 * Additional Authors:
15 * Alan Cox, <gw4pts@gw4pts.ampr.org>
16 * Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
17 *
18 * Changes:
19 * Alexey Kuznetsov: pa_* fields are replaced with ifaddr
20 * lists.
21 * Cyrus Durgin: updated for kmod
22 * Matthias Andree: in devinet_ioctl, compare label and
23 * address (4.4BSD alias style support),
24 * fall back to comparing just the label
25 * if no match found.
26 */
27
28
29 #include <asm/uaccess.h>
30 #include <linux/bitops.h>
31 #include <linux/capability.h>
32 #include <linux/module.h>
33 #include <linux/types.h>
34 #include <linux/kernel.h>
35 #include <linux/string.h>
36 #include <linux/mm.h>
37 #include <linux/socket.h>
38 #include <linux/sockios.h>
39 #include <linux/in.h>
40 #include <linux/errno.h>
41 #include <linux/interrupt.h>
42 #include <linux/if_addr.h>
43 #include <linux/if_ether.h>
44 #include <linux/inet.h>
45 #include <linux/netdevice.h>
46 #include <linux/etherdevice.h>
47 #include <linux/skbuff.h>
48 #include <linux/init.h>
49 #include <linux/notifier.h>
50 #include <linux/inetdevice.h>
51 #include <linux/igmp.h>
52 #include <linux/slab.h>
53 #include <linux/hash.h>
54 #ifdef CONFIG_SYSCTL
55 #include <linux/sysctl.h>
56 #endif
57 #include <linux/kmod.h>
58
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
68 static 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
77 static 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
90 static 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
102 static struct hlist_head inet_addr_lst[IN4_ADDR_HSIZE];
103 static DEFINE_SPINLOCK(inet_addr_hash_lock);
104
105 static 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
113 static 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
122 static void inet_hash_remove(struct in_ifaddr *ifa)
123 {
124 spin_lock(&inet_addr_hash_lock);
125 hlist_del_init_rcu(&ifa->hash);
126 spin_unlock(&inet_addr_hash_lock);
127 }
128
129 /**
130 * __ip_dev_find - find the first device with a given source address.
131 * @net: the net namespace
132 * @addr: the source address
133 * @devref: if true, take a reference on the found device
134 *
135 * If a caller uses devref=false, it should be protected by RCU, or RTNL
136 */
137 struct net_device *__ip_dev_find(struct net *net, __be32 addr, bool devref)
138 {
139 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 }
174 EXPORT_SYMBOL(__ip_dev_find);
175
176 static void rtmsg_ifa(int event, struct in_ifaddr *, struct nlmsghdr *, u32);
177
178 static BLOCKING_NOTIFIER_HEAD(inetaddr_chain);
179 static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
180 int destroy);
181 #ifdef CONFIG_SYSCTL
182 static void devinet_sysctl_register(struct in_device *idev);
183 static void devinet_sysctl_unregister(struct in_device *idev);
184 #else
185 static inline void devinet_sysctl_register(struct in_device *idev)
186 {
187 }
188 static inline void devinet_sysctl_unregister(struct in_device *idev)
189 {
190 }
191 #endif
192
193 /* Locks all the inet devices. */
194
195 static struct in_ifaddr *inet_alloc_ifa(void)
196 {
197 return kzalloc(sizeof(struct in_ifaddr), GFP_KERNEL);
198 }
199
200 static 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
208 static inline void inet_free_ifa(struct in_ifaddr *ifa)
209 {
210 call_rcu(&ifa->rcu_head, inet_rcu_free_ifa);
211 }
212
213 void 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 }
228 EXPORT_SYMBOL(in_dev_finish_destroy);
229
230 static struct in_device *inetdev_init(struct net_device *dev)
231 {
232 struct in_device *in_dev;
233
234 ASSERT_RTNL();
235
236 in_dev = kzalloc(sizeof(*in_dev), GFP_KERNEL);
237 if (!in_dev)
238 goto out;
239 memcpy(&in_dev->cnf, dev_net(dev)->ipv4.devconf_dflt,
240 sizeof(in_dev->cnf));
241 in_dev->cnf.sysctl = NULL;
242 in_dev->dev = dev;
243 in_dev->arp_parms = neigh_parms_alloc(dev, &arp_tbl);
244 if (!in_dev->arp_parms)
245 goto out_kfree;
246 if (IPV4_DEVCONF(in_dev->cnf, FORWARDING))
247 dev_disable_lro(dev);
248 /* Reference in_dev->dev */
249 dev_hold(dev);
250 /* Account for reference dev->ip_ptr (below) */
251 in_dev_hold(in_dev);
252
253 devinet_sysctl_register(in_dev);
254 ip_mc_init_dev(in_dev);
255 if (dev->flags & IFF_UP)
256 ip_mc_up(in_dev);
257
258 /* we can receive as soon as ip_ptr is set -- do this last */
259 rcu_assign_pointer(dev->ip_ptr, in_dev);
260 out:
261 return in_dev;
262 out_kfree:
263 kfree(in_dev);
264 in_dev = NULL;
265 goto out;
266 }
267
268 static void in_dev_rcu_put(struct rcu_head *head)
269 {
270 struct in_device *idev = container_of(head, struct in_device, rcu_head);
271 in_dev_put(idev);
272 }
273
274 static void inetdev_destroy(struct in_device *in_dev)
275 {
276 struct in_ifaddr *ifa;
277 struct net_device *dev;
278
279 ASSERT_RTNL();
280
281 dev = in_dev->dev;
282
283 in_dev->dead = 1;
284
285 ip_mc_destroy_dev(in_dev);
286
287 while ((ifa = in_dev->ifa_list) != NULL) {
288 inet_del_ifa(in_dev, &in_dev->ifa_list, 0);
289 inet_free_ifa(ifa);
290 }
291
292 RCU_INIT_POINTER(dev->ip_ptr, NULL);
293
294 devinet_sysctl_unregister(in_dev);
295 neigh_parms_release(&arp_tbl, in_dev->arp_parms);
296 arp_ifdown(dev);
297
298 call_rcu(&in_dev->rcu_head, in_dev_rcu_put);
299 }
300
301 int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b)
302 {
303 rcu_read_lock();
304 for_primary_ifa(in_dev) {
305 if (inet_ifa_match(a, ifa)) {
306 if (!b || inet_ifa_match(b, ifa)) {
307 rcu_read_unlock();
308 return 1;
309 }
310 }
311 } endfor_ifa(in_dev);
312 rcu_read_unlock();
313 return 0;
314 }
315
316 static void __inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
317 int destroy, struct nlmsghdr *nlh, u32 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
416 static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
417 int destroy)
418 {
419 __inet_del_ifa(in_dev, ifap, destroy, NULL, 0);
420 }
421
422 static 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
476 static int inet_insert_ifa(struct in_ifaddr *ifa)
477 {
478 return __inet_insert_ifa(ifa, NULL, 0);
479 }
480
481 static 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 */
505 struct 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 }
517 EXPORT_SYMBOL(inetdev_by_index);
518
519 /* Called only from RTNL semaphored context. No locks. */
520
521 struct 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
533 static 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;
574 errout:
575 return err;
576 }
577
578 static 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
640 errout:
641 return ERR_PTR(err);
642 }
643
644 static 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
662 static 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
683 int 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 }
914 done:
915 rtnl_unlock();
916 out:
917 return ret;
918 rarok:
919 rtnl_unlock();
920 ret = copy_to_user(arg, &ifr, sizeof(struct ifreq)) ? -EFAULT : 0;
921 goto out;
922 }
923
924 static 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 }
959 out:
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;
987 no_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 }
1006 out_unlock:
1007 rcu_read_unlock();
1008 return addr;
1009 }
1010 EXPORT_SYMBOL(inet_select_addr);
1011
1012 static __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 }
1080 EXPORT_SYMBOL(inet_confirm_addr);
1081
1082 /*
1083 * Device notifier
1084 */
1085
1086 int register_inetaddr_notifier(struct notifier_block *nb)
1087 {
1088 return blocking_notifier_chain_register(&inetaddr_chain, nb);
1089 }
1090 EXPORT_SYMBOL(register_inetaddr_notifier);
1091
1092 int unregister_inetaddr_notifier(struct notifier_block *nb)
1093 {
1094 return blocking_notifier_chain_unregister(&inetaddr_chain, nb);
1095 }
1096 EXPORT_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 */
1101 static 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);
1122 skip:
1123 rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0);
1124 }
1125 }
1126
1127 static inline bool inetdev_valid_mtu(unsigned int mtu)
1128 {
1129 return mtu >= 68;
1130 }
1131
1132 static 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
1149 static 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 }
1234 out:
1235 return NOTIFY_DONE;
1236 }
1237
1238 static struct notifier_block ip_netdev_notifier = {
1239 .notifier_call = inetdev_event,
1240 };
1241
1242 static 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
1251 static 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
1280 nla_put_failure:
1281 nlmsg_cancel(skb, nlh);
1282 return -EMSGSIZE;
1283 }
1284
1285 static 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 }
1326 cont:
1327 idx++;
1328 }
1329 rcu_read_unlock();
1330 }
1331
1332 done:
1333 cb->args[0] = h;
1334 cb->args[1] = idx;
1335 cb->args[2] = ip_idx;
1336
1337 return skb->len;
1338 }
1339
1340 static 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;
1362 errout:
1363 if (err < 0)
1364 rtnl_set_sk_err(net, RTNLGRP_IPV4_IFADDR, err);
1365 }
1366
1367 static 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
1377 static 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
1396 static const struct nla_policy inet_af_policy[IFLA_INET_MAX+1] = {
1397 [IFLA_INET_CONF] = { .type = NLA_NESTED },
1398 };
1399
1400 static 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
1428 static 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
1450 static 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 */
1466 static 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
1486 static 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 i == IPV4_DEVCONF_ROUTE_LOCALNET - 1)
1505 if ((new_value == 0) && (old_value != 0))
1506 rt_cache_flush(net, 0);
1507 }
1508
1509 return ret;
1510 }
1511
1512 static int devinet_sysctl_forward(ctl_table *ctl, int write,
1513 void __user *buffer,
1514 size_t *lenp, loff_t *ppos)
1515 {
1516 int *valp = ctl->data;
1517 int val = *valp;
1518 loff_t pos = *ppos;
1519 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
1520
1521 if (write && *valp != val) {
1522 struct net *net = ctl->extra2;
1523
1524 if (valp != &IPV4_DEVCONF_DFLT(net, FORWARDING)) {
1525 if (!rtnl_trylock()) {
1526 /* Restore the original values before restarting */
1527 *valp = val;
1528 *ppos = pos;
1529 return restart_syscall();
1530 }
1531 if (valp == &IPV4_DEVCONF_ALL(net, FORWARDING)) {
1532 inet_forward_change(net);
1533 } else if (*valp) {
1534 struct ipv4_devconf *cnf = ctl->extra1;
1535 struct in_device *idev =
1536 container_of(cnf, struct in_device, cnf);
1537 dev_disable_lro(idev->dev);
1538 }
1539 rtnl_unlock();
1540 rt_cache_flush(net, 0);
1541 }
1542 }
1543
1544 return ret;
1545 }
1546
1547 static int ipv4_doint_and_flush(ctl_table *ctl, int write,
1548 void __user *buffer,
1549 size_t *lenp, loff_t *ppos)
1550 {
1551 int *valp = ctl->data;
1552 int val = *valp;
1553 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
1554 struct net *net = ctl->extra2;
1555
1556 if (write && *valp != val)
1557 rt_cache_flush(net, 0);
1558
1559 return ret;
1560 }
1561
1562 #define DEVINET_SYSCTL_ENTRY(attr, name, mval, proc) \
1563 { \
1564 .procname = name, \
1565 .data = ipv4_devconf.data + \
1566 IPV4_DEVCONF_ ## attr - 1, \
1567 .maxlen = sizeof(int), \
1568 .mode = mval, \
1569 .proc_handler = proc, \
1570 .extra1 = &ipv4_devconf, \
1571 }
1572
1573 #define DEVINET_SYSCTL_RW_ENTRY(attr, name) \
1574 DEVINET_SYSCTL_ENTRY(attr, name, 0644, devinet_conf_proc)
1575
1576 #define DEVINET_SYSCTL_RO_ENTRY(attr, name) \
1577 DEVINET_SYSCTL_ENTRY(attr, name, 0444, devinet_conf_proc)
1578
1579 #define DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, proc) \
1580 DEVINET_SYSCTL_ENTRY(attr, name, 0644, proc)
1581
1582 #define DEVINET_SYSCTL_FLUSHING_ENTRY(attr, name) \
1583 DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, ipv4_doint_and_flush)
1584
1585 static struct devinet_sysctl_table {
1586 struct ctl_table_header *sysctl_header;
1587 struct ctl_table devinet_vars[__IPV4_DEVCONF_MAX];
1588 } devinet_sysctl = {
1589 .devinet_vars = {
1590 DEVINET_SYSCTL_COMPLEX_ENTRY(FORWARDING, "forwarding",
1591 devinet_sysctl_forward),
1592 DEVINET_SYSCTL_RO_ENTRY(MC_FORWARDING, "mc_forwarding"),
1593
1594 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_REDIRECTS, "accept_redirects"),
1595 DEVINET_SYSCTL_RW_ENTRY(SECURE_REDIRECTS, "secure_redirects"),
1596 DEVINET_SYSCTL_RW_ENTRY(SHARED_MEDIA, "shared_media"),
1597 DEVINET_SYSCTL_RW_ENTRY(RP_FILTER, "rp_filter"),
1598 DEVINET_SYSCTL_RW_ENTRY(SEND_REDIRECTS, "send_redirects"),
1599 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_SOURCE_ROUTE,
1600 "accept_source_route"),
1601 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_LOCAL, "accept_local"),
1602 DEVINET_SYSCTL_RW_ENTRY(SRC_VMARK, "src_valid_mark"),
1603 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP, "proxy_arp"),
1604 DEVINET_SYSCTL_RW_ENTRY(MEDIUM_ID, "medium_id"),
1605 DEVINET_SYSCTL_RW_ENTRY(BOOTP_RELAY, "bootp_relay"),
1606 DEVINET_SYSCTL_RW_ENTRY(LOG_MARTIANS, "log_martians"),
1607 DEVINET_SYSCTL_RW_ENTRY(TAG, "tag"),
1608 DEVINET_SYSCTL_RW_ENTRY(ARPFILTER, "arp_filter"),
1609 DEVINET_SYSCTL_RW_ENTRY(ARP_ANNOUNCE, "arp_announce"),
1610 DEVINET_SYSCTL_RW_ENTRY(ARP_IGNORE, "arp_ignore"),
1611 DEVINET_SYSCTL_RW_ENTRY(ARP_ACCEPT, "arp_accept"),
1612 DEVINET_SYSCTL_RW_ENTRY(ARP_NOTIFY, "arp_notify"),
1613 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP_PVLAN, "proxy_arp_pvlan"),
1614
1615 DEVINET_SYSCTL_FLUSHING_ENTRY(NOXFRM, "disable_xfrm"),
1616 DEVINET_SYSCTL_FLUSHING_ENTRY(NOPOLICY, "disable_policy"),
1617 DEVINET_SYSCTL_FLUSHING_ENTRY(FORCE_IGMP_VERSION,
1618 "force_igmp_version"),
1619 DEVINET_SYSCTL_FLUSHING_ENTRY(PROMOTE_SECONDARIES,
1620 "promote_secondaries"),
1621 DEVINET_SYSCTL_FLUSHING_ENTRY(ROUTE_LOCALNET,
1622 "route_localnet"),
1623 },
1624 };
1625
1626 static int __devinet_sysctl_register(struct net *net, char *dev_name,
1627 struct ipv4_devconf *p)
1628 {
1629 int i;
1630 struct devinet_sysctl_table *t;
1631 char path[sizeof("net/ipv4/conf/") + IFNAMSIZ];
1632
1633 t = kmemdup(&devinet_sysctl, sizeof(*t), GFP_KERNEL);
1634 if (!t)
1635 goto out;
1636
1637 for (i = 0; i < ARRAY_SIZE(t->devinet_vars) - 1; i++) {
1638 t->devinet_vars[i].data += (char *)p - (char *)&ipv4_devconf;
1639 t->devinet_vars[i].extra1 = p;
1640 t->devinet_vars[i].extra2 = net;
1641 }
1642
1643 snprintf(path, sizeof(path), "net/ipv4/conf/%s", dev_name);
1644
1645 t->sysctl_header = register_net_sysctl(net, path, t->devinet_vars);
1646 if (!t->sysctl_header)
1647 goto free;
1648
1649 p->sysctl = t;
1650 return 0;
1651
1652 free:
1653 kfree(t);
1654 out:
1655 return -ENOBUFS;
1656 }
1657
1658 static void __devinet_sysctl_unregister(struct ipv4_devconf *cnf)
1659 {
1660 struct devinet_sysctl_table *t = cnf->sysctl;
1661
1662 if (t == NULL)
1663 return;
1664
1665 cnf->sysctl = NULL;
1666 unregister_net_sysctl_table(t->sysctl_header);
1667 kfree(t);
1668 }
1669
1670 static void devinet_sysctl_register(struct in_device *idev)
1671 {
1672 neigh_sysctl_register(idev->dev, idev->arp_parms, "ipv4", NULL);
1673 __devinet_sysctl_register(dev_net(idev->dev), idev->dev->name,
1674 &idev->cnf);
1675 }
1676
1677 static void devinet_sysctl_unregister(struct in_device *idev)
1678 {
1679 __devinet_sysctl_unregister(&idev->cnf);
1680 neigh_sysctl_unregister(idev->arp_parms);
1681 }
1682
1683 static struct ctl_table ctl_forward_entry[] = {
1684 {
1685 .procname = "ip_forward",
1686 .data = &ipv4_devconf.data[
1687 IPV4_DEVCONF_FORWARDING - 1],
1688 .maxlen = sizeof(int),
1689 .mode = 0644,
1690 .proc_handler = devinet_sysctl_forward,
1691 .extra1 = &ipv4_devconf,
1692 .extra2 = &init_net,
1693 },
1694 { },
1695 };
1696 #endif
1697
1698 static __net_init int devinet_init_net(struct net *net)
1699 {
1700 int err;
1701 struct ipv4_devconf *all, *dflt;
1702 #ifdef CONFIG_SYSCTL
1703 struct ctl_table *tbl = ctl_forward_entry;
1704 struct ctl_table_header *forw_hdr;
1705 #endif
1706
1707 err = -ENOMEM;
1708 all = &ipv4_devconf;
1709 dflt = &ipv4_devconf_dflt;
1710
1711 if (!net_eq(net, &init_net)) {
1712 all = kmemdup(all, sizeof(ipv4_devconf), GFP_KERNEL);
1713 if (all == NULL)
1714 goto err_alloc_all;
1715
1716 dflt = kmemdup(dflt, sizeof(ipv4_devconf_dflt), GFP_KERNEL);
1717 if (dflt == NULL)
1718 goto err_alloc_dflt;
1719
1720 #ifdef CONFIG_SYSCTL
1721 tbl = kmemdup(tbl, sizeof(ctl_forward_entry), GFP_KERNEL);
1722 if (tbl == NULL)
1723 goto err_alloc_ctl;
1724
1725 tbl[0].data = &all->data[IPV4_DEVCONF_FORWARDING - 1];
1726 tbl[0].extra1 = all;
1727 tbl[0].extra2 = net;
1728 #endif
1729 }
1730
1731 #ifdef CONFIG_SYSCTL
1732 err = __devinet_sysctl_register(net, "all", all);
1733 if (err < 0)
1734 goto err_reg_all;
1735
1736 err = __devinet_sysctl_register(net, "default", dflt);
1737 if (err < 0)
1738 goto err_reg_dflt;
1739
1740 err = -ENOMEM;
1741 forw_hdr = register_net_sysctl(net, "net/ipv4", tbl);
1742 if (forw_hdr == NULL)
1743 goto err_reg_ctl;
1744 net->ipv4.forw_hdr = forw_hdr;
1745 #endif
1746
1747 net->ipv4.devconf_all = all;
1748 net->ipv4.devconf_dflt = dflt;
1749 return 0;
1750
1751 #ifdef CONFIG_SYSCTL
1752 err_reg_ctl:
1753 __devinet_sysctl_unregister(dflt);
1754 err_reg_dflt:
1755 __devinet_sysctl_unregister(all);
1756 err_reg_all:
1757 if (tbl != ctl_forward_entry)
1758 kfree(tbl);
1759 err_alloc_ctl:
1760 #endif
1761 if (dflt != &ipv4_devconf_dflt)
1762 kfree(dflt);
1763 err_alloc_dflt:
1764 if (all != &ipv4_devconf)
1765 kfree(all);
1766 err_alloc_all:
1767 return err;
1768 }
1769
1770 static __net_exit void devinet_exit_net(struct net *net)
1771 {
1772 #ifdef CONFIG_SYSCTL
1773 struct ctl_table *tbl;
1774
1775 tbl = net->ipv4.forw_hdr->ctl_table_arg;
1776 unregister_net_sysctl_table(net->ipv4.forw_hdr);
1777 __devinet_sysctl_unregister(net->ipv4.devconf_dflt);
1778 __devinet_sysctl_unregister(net->ipv4.devconf_all);
1779 kfree(tbl);
1780 #endif
1781 kfree(net->ipv4.devconf_dflt);
1782 kfree(net->ipv4.devconf_all);
1783 }
1784
1785 static __net_initdata struct pernet_operations devinet_ops = {
1786 .init = devinet_init_net,
1787 .exit = devinet_exit_net,
1788 };
1789
1790 static struct rtnl_af_ops inet_af_ops = {
1791 .family = AF_INET,
1792 .fill_link_af = inet_fill_link_af,
1793 .get_link_af_size = inet_get_link_af_size,
1794 .validate_link_af = inet_validate_link_af,
1795 .set_link_af = inet_set_link_af,
1796 };
1797
1798 void __init devinet_init(void)
1799 {
1800 int i;
1801
1802 for (i = 0; i < IN4_ADDR_HSIZE; i++)
1803 INIT_HLIST_HEAD(&inet_addr_lst[i]);
1804
1805 register_pernet_subsys(&devinet_ops);
1806
1807 register_gifconf(PF_INET, inet_gifconf);
1808 register_netdevice_notifier(&ip_netdev_notifier);
1809
1810 rtnl_af_register(&inet_af_ops);
1811
1812 rtnl_register(PF_INET, RTM_NEWADDR, inet_rtm_newaddr, NULL, NULL);
1813 rtnl_register(PF_INET, RTM_DELADDR, inet_rtm_deladdr, NULL, NULL);
1814 rtnl_register(PF_INET, RTM_GETADDR, NULL, inet_dump_ifaddr, NULL);
1815 }
1816
Linux kernel - Deliverables
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