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Merge branch 'hotfixes' of git://git.linux-nfs.org/projects/trondmy/nfs-2.6
[mirror_ubuntu-artful-kernel.git] / net / ipv4 / devinet.c
1 /*
2 * NET3 IP device support routines.
3 *
4 * Version: $Id: devinet.c,v 1.44 2001/10/31 21:55:54 davem Exp $
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 *
11 * Derived from the IP parts of dev.c 1.0.19
12 * Authors: Ross Biro
13 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
14 * Mark Evans, <evansmp@uhura.aston.ac.uk>
15 *
16 * Additional Authors:
17 * Alan Cox, <gw4pts@gw4pts.ampr.org>
18 * Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
19 *
20 * Changes:
21 * Alexey Kuznetsov: pa_* fields are replaced with ifaddr
22 * lists.
23 * Cyrus Durgin: updated for kmod
24 * Matthias Andree: in devinet_ioctl, compare label and
25 * address (4.4BSD alias style support),
26 * fall back to comparing just the label
27 * if no match found.
28 */
29
30
31 #include <asm/uaccess.h>
32 #include <asm/system.h>
33 #include <linux/bitops.h>
34 #include <linux/capability.h>
35 #include <linux/module.h>
36 #include <linux/types.h>
37 #include <linux/kernel.h>
38 #include <linux/string.h>
39 #include <linux/mm.h>
40 #include <linux/socket.h>
41 #include <linux/sockios.h>
42 #include <linux/in.h>
43 #include <linux/errno.h>
44 #include <linux/interrupt.h>
45 #include <linux/if_addr.h>
46 #include <linux/if_ether.h>
47 #include <linux/inet.h>
48 #include <linux/netdevice.h>
49 #include <linux/etherdevice.h>
50 #include <linux/skbuff.h>
51 #include <linux/init.h>
52 #include <linux/notifier.h>
53 #include <linux/inetdevice.h>
54 #include <linux/igmp.h>
55 #ifdef CONFIG_SYSCTL
56 #include <linux/sysctl.h>
57 #endif
58 #include <linux/kmod.h>
59
60 #include <net/arp.h>
61 #include <net/ip.h>
62 #include <net/route.h>
63 #include <net/ip_fib.h>
64 #include <net/rtnetlink.h>
65 #include <net/net_namespace.h>
66
67 static struct ipv4_devconf ipv4_devconf = {
68 .data = {
69 [NET_IPV4_CONF_ACCEPT_REDIRECTS - 1] = 1,
70 [NET_IPV4_CONF_SEND_REDIRECTS - 1] = 1,
71 [NET_IPV4_CONF_SECURE_REDIRECTS - 1] = 1,
72 [NET_IPV4_CONF_SHARED_MEDIA - 1] = 1,
73 },
74 };
75
76 static struct ipv4_devconf ipv4_devconf_dflt = {
77 .data = {
78 [NET_IPV4_CONF_ACCEPT_REDIRECTS - 1] = 1,
79 [NET_IPV4_CONF_SEND_REDIRECTS - 1] = 1,
80 [NET_IPV4_CONF_SECURE_REDIRECTS - 1] = 1,
81 [NET_IPV4_CONF_SHARED_MEDIA - 1] = 1,
82 [NET_IPV4_CONF_ACCEPT_SOURCE_ROUTE - 1] = 1,
83 },
84 };
85
86 #define IPV4_DEVCONF_DFLT(net, attr) \
87 IPV4_DEVCONF((*net->ipv4.devconf_dflt), attr)
88
89 static const struct nla_policy ifa_ipv4_policy[IFA_MAX+1] = {
90 [IFA_LOCAL] = { .type = NLA_U32 },
91 [IFA_ADDRESS] = { .type = NLA_U32 },
92 [IFA_BROADCAST] = { .type = NLA_U32 },
93 [IFA_ANYCAST] = { .type = NLA_U32 },
94 [IFA_LABEL] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 },
95 };
96
97 static void rtmsg_ifa(int event, struct in_ifaddr *, struct nlmsghdr *, u32);
98
99 static BLOCKING_NOTIFIER_HEAD(inetaddr_chain);
100 static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
101 int destroy);
102 #ifdef CONFIG_SYSCTL
103 static void devinet_sysctl_register(struct in_device *idev);
104 static void devinet_sysctl_unregister(struct in_device *idev);
105 #else
106 static inline void devinet_sysctl_register(struct in_device *idev)
107 {
108 }
109 static inline void devinet_sysctl_unregister(struct in_device *idev)
110 {
111 }
112 #endif
113
114 /* Locks all the inet devices. */
115
116 static struct in_ifaddr *inet_alloc_ifa(void)
117 {
118 struct in_ifaddr *ifa = kzalloc(sizeof(*ifa), GFP_KERNEL);
119
120 if (ifa) {
121 INIT_RCU_HEAD(&ifa->rcu_head);
122 }
123
124 return ifa;
125 }
126
127 static void inet_rcu_free_ifa(struct rcu_head *head)
128 {
129 struct in_ifaddr *ifa = container_of(head, struct in_ifaddr, rcu_head);
130 if (ifa->ifa_dev)
131 in_dev_put(ifa->ifa_dev);
132 kfree(ifa);
133 }
134
135 static inline void inet_free_ifa(struct in_ifaddr *ifa)
136 {
137 call_rcu(&ifa->rcu_head, inet_rcu_free_ifa);
138 }
139
140 void in_dev_finish_destroy(struct in_device *idev)
141 {
142 struct net_device *dev = idev->dev;
143
144 BUG_TRAP(!idev->ifa_list);
145 BUG_TRAP(!idev->mc_list);
146 #ifdef NET_REFCNT_DEBUG
147 printk(KERN_DEBUG "in_dev_finish_destroy: %p=%s\n",
148 idev, dev ? dev->name : "NIL");
149 #endif
150 dev_put(dev);
151 if (!idev->dead)
152 printk("Freeing alive in_device %p\n", idev);
153 else {
154 kfree(idev);
155 }
156 }
157
158 static struct in_device *inetdev_init(struct net_device *dev)
159 {
160 struct in_device *in_dev;
161
162 ASSERT_RTNL();
163
164 in_dev = kzalloc(sizeof(*in_dev), GFP_KERNEL);
165 if (!in_dev)
166 goto out;
167 INIT_RCU_HEAD(&in_dev->rcu_head);
168 memcpy(&in_dev->cnf, dev->nd_net->ipv4.devconf_dflt,
169 sizeof(in_dev->cnf));
170 in_dev->cnf.sysctl = NULL;
171 in_dev->dev = dev;
172 if ((in_dev->arp_parms = neigh_parms_alloc(dev, &arp_tbl)) == NULL)
173 goto out_kfree;
174 /* Reference in_dev->dev */
175 dev_hold(dev);
176 /* Account for reference dev->ip_ptr (below) */
177 in_dev_hold(in_dev);
178
179 devinet_sysctl_register(in_dev);
180 ip_mc_init_dev(in_dev);
181 if (dev->flags & IFF_UP)
182 ip_mc_up(in_dev);
183
184 /* we can receive as soon as ip_ptr is set -- do this last */
185 rcu_assign_pointer(dev->ip_ptr, in_dev);
186 out:
187 return in_dev;
188 out_kfree:
189 kfree(in_dev);
190 in_dev = NULL;
191 goto out;
192 }
193
194 static void in_dev_rcu_put(struct rcu_head *head)
195 {
196 struct in_device *idev = container_of(head, struct in_device, rcu_head);
197 in_dev_put(idev);
198 }
199
200 static void inetdev_destroy(struct in_device *in_dev)
201 {
202 struct in_ifaddr *ifa;
203 struct net_device *dev;
204
205 ASSERT_RTNL();
206
207 dev = in_dev->dev;
208
209 in_dev->dead = 1;
210
211 ip_mc_destroy_dev(in_dev);
212
213 while ((ifa = in_dev->ifa_list) != NULL) {
214 inet_del_ifa(in_dev, &in_dev->ifa_list, 0);
215 inet_free_ifa(ifa);
216 }
217
218 dev->ip_ptr = NULL;
219
220 devinet_sysctl_unregister(in_dev);
221 neigh_parms_release(&arp_tbl, in_dev->arp_parms);
222 arp_ifdown(dev);
223
224 call_rcu(&in_dev->rcu_head, in_dev_rcu_put);
225 }
226
227 int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b)
228 {
229 rcu_read_lock();
230 for_primary_ifa(in_dev) {
231 if (inet_ifa_match(a, ifa)) {
232 if (!b || inet_ifa_match(b, ifa)) {
233 rcu_read_unlock();
234 return 1;
235 }
236 }
237 } endfor_ifa(in_dev);
238 rcu_read_unlock();
239 return 0;
240 }
241
242 static void __inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
243 int destroy, struct nlmsghdr *nlh, u32 pid)
244 {
245 struct in_ifaddr *promote = NULL;
246 struct in_ifaddr *ifa, *ifa1 = *ifap;
247 struct in_ifaddr *last_prim = in_dev->ifa_list;
248 struct in_ifaddr *prev_prom = NULL;
249 int do_promote = IN_DEV_PROMOTE_SECONDARIES(in_dev);
250
251 ASSERT_RTNL();
252
253 /* 1. Deleting primary ifaddr forces deletion all secondaries
254 * unless alias promotion is set
255 **/
256
257 if (!(ifa1->ifa_flags & IFA_F_SECONDARY)) {
258 struct in_ifaddr **ifap1 = &ifa1->ifa_next;
259
260 while ((ifa = *ifap1) != NULL) {
261 if (!(ifa->ifa_flags & IFA_F_SECONDARY) &&
262 ifa1->ifa_scope <= ifa->ifa_scope)
263 last_prim = ifa;
264
265 if (!(ifa->ifa_flags & IFA_F_SECONDARY) ||
266 ifa1->ifa_mask != ifa->ifa_mask ||
267 !inet_ifa_match(ifa1->ifa_address, ifa)) {
268 ifap1 = &ifa->ifa_next;
269 prev_prom = ifa;
270 continue;
271 }
272
273 if (!do_promote) {
274 *ifap1 = ifa->ifa_next;
275
276 rtmsg_ifa(RTM_DELADDR, ifa, nlh, pid);
277 blocking_notifier_call_chain(&inetaddr_chain,
278 NETDEV_DOWN, ifa);
279 inet_free_ifa(ifa);
280 } else {
281 promote = ifa;
282 break;
283 }
284 }
285 }
286
287 /* 2. Unlink it */
288
289 *ifap = ifa1->ifa_next;
290
291 /* 3. Announce address deletion */
292
293 /* Send message first, then call notifier.
294 At first sight, FIB update triggered by notifier
295 will refer to already deleted ifaddr, that could confuse
296 netlink listeners. It is not true: look, gated sees
297 that route deleted and if it still thinks that ifaddr
298 is valid, it will try to restore deleted routes... Grr.
299 So that, this order is correct.
300 */
301 rtmsg_ifa(RTM_DELADDR, ifa1, nlh, pid);
302 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa1);
303
304 if (promote) {
305
306 if (prev_prom) {
307 prev_prom->ifa_next = promote->ifa_next;
308 promote->ifa_next = last_prim->ifa_next;
309 last_prim->ifa_next = promote;
310 }
311
312 promote->ifa_flags &= ~IFA_F_SECONDARY;
313 rtmsg_ifa(RTM_NEWADDR, promote, nlh, pid);
314 blocking_notifier_call_chain(&inetaddr_chain,
315 NETDEV_UP, promote);
316 for (ifa = promote->ifa_next; ifa; ifa = ifa->ifa_next) {
317 if (ifa1->ifa_mask != ifa->ifa_mask ||
318 !inet_ifa_match(ifa1->ifa_address, ifa))
319 continue;
320 fib_add_ifaddr(ifa);
321 }
322
323 }
324 if (destroy)
325 inet_free_ifa(ifa1);
326 }
327
328 static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
329 int destroy)
330 {
331 __inet_del_ifa(in_dev, ifap, destroy, NULL, 0);
332 }
333
334 static int __inet_insert_ifa(struct in_ifaddr *ifa, struct nlmsghdr *nlh,
335 u32 pid)
336 {
337 struct in_device *in_dev = ifa->ifa_dev;
338 struct in_ifaddr *ifa1, **ifap, **last_primary;
339
340 ASSERT_RTNL();
341
342 if (!ifa->ifa_local) {
343 inet_free_ifa(ifa);
344 return 0;
345 }
346
347 ifa->ifa_flags &= ~IFA_F_SECONDARY;
348 last_primary = &in_dev->ifa_list;
349
350 for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL;
351 ifap = &ifa1->ifa_next) {
352 if (!(ifa1->ifa_flags & IFA_F_SECONDARY) &&
353 ifa->ifa_scope <= ifa1->ifa_scope)
354 last_primary = &ifa1->ifa_next;
355 if (ifa1->ifa_mask == ifa->ifa_mask &&
356 inet_ifa_match(ifa1->ifa_address, ifa)) {
357 if (ifa1->ifa_local == ifa->ifa_local) {
358 inet_free_ifa(ifa);
359 return -EEXIST;
360 }
361 if (ifa1->ifa_scope != ifa->ifa_scope) {
362 inet_free_ifa(ifa);
363 return -EINVAL;
364 }
365 ifa->ifa_flags |= IFA_F_SECONDARY;
366 }
367 }
368
369 if (!(ifa->ifa_flags & IFA_F_SECONDARY)) {
370 net_srandom(ifa->ifa_local);
371 ifap = last_primary;
372 }
373
374 ifa->ifa_next = *ifap;
375 *ifap = ifa;
376
377 /* Send message first, then call notifier.
378 Notifier will trigger FIB update, so that
379 listeners of netlink will know about new ifaddr */
380 rtmsg_ifa(RTM_NEWADDR, ifa, nlh, pid);
381 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa);
382
383 return 0;
384 }
385
386 static int inet_insert_ifa(struct in_ifaddr *ifa)
387 {
388 return __inet_insert_ifa(ifa, NULL, 0);
389 }
390
391 static int inet_set_ifa(struct net_device *dev, struct in_ifaddr *ifa)
392 {
393 struct in_device *in_dev = __in_dev_get_rtnl(dev);
394
395 ASSERT_RTNL();
396
397 if (!in_dev) {
398 inet_free_ifa(ifa);
399 return -ENOBUFS;
400 }
401 ipv4_devconf_setall(in_dev);
402 if (ifa->ifa_dev != in_dev) {
403 BUG_TRAP(!ifa->ifa_dev);
404 in_dev_hold(in_dev);
405 ifa->ifa_dev = in_dev;
406 }
407 if (ipv4_is_loopback(ifa->ifa_local))
408 ifa->ifa_scope = RT_SCOPE_HOST;
409 return inet_insert_ifa(ifa);
410 }
411
412 struct in_device *inetdev_by_index(struct net *net, int ifindex)
413 {
414 struct net_device *dev;
415 struct in_device *in_dev = NULL;
416 read_lock(&dev_base_lock);
417 dev = __dev_get_by_index(net, ifindex);
418 if (dev)
419 in_dev = in_dev_get(dev);
420 read_unlock(&dev_base_lock);
421 return in_dev;
422 }
423
424 /* Called only from RTNL semaphored context. No locks. */
425
426 struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix,
427 __be32 mask)
428 {
429 ASSERT_RTNL();
430
431 for_primary_ifa(in_dev) {
432 if (ifa->ifa_mask == mask && inet_ifa_match(prefix, ifa))
433 return ifa;
434 } endfor_ifa(in_dev);
435 return NULL;
436 }
437
438 static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
439 {
440 struct net *net = skb->sk->sk_net;
441 struct nlattr *tb[IFA_MAX+1];
442 struct in_device *in_dev;
443 struct ifaddrmsg *ifm;
444 struct in_ifaddr *ifa, **ifap;
445 int err = -EINVAL;
446
447 ASSERT_RTNL();
448
449 if (net != &init_net)
450 return -EINVAL;
451
452 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy);
453 if (err < 0)
454 goto errout;
455
456 ifm = nlmsg_data(nlh);
457 in_dev = inetdev_by_index(net, ifm->ifa_index);
458 if (in_dev == NULL) {
459 err = -ENODEV;
460 goto errout;
461 }
462
463 __in_dev_put(in_dev);
464
465 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
466 ifap = &ifa->ifa_next) {
467 if (tb[IFA_LOCAL] &&
468 ifa->ifa_local != nla_get_be32(tb[IFA_LOCAL]))
469 continue;
470
471 if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label))
472 continue;
473
474 if (tb[IFA_ADDRESS] &&
475 (ifm->ifa_prefixlen != ifa->ifa_prefixlen ||
476 !inet_ifa_match(nla_get_be32(tb[IFA_ADDRESS]), ifa)))
477 continue;
478
479 __inet_del_ifa(in_dev, ifap, 1, nlh, NETLINK_CB(skb).pid);
480 return 0;
481 }
482
483 err = -EADDRNOTAVAIL;
484 errout:
485 return err;
486 }
487
488 static struct in_ifaddr *rtm_to_ifaddr(struct net *net, struct nlmsghdr *nlh)
489 {
490 struct nlattr *tb[IFA_MAX+1];
491 struct in_ifaddr *ifa;
492 struct ifaddrmsg *ifm;
493 struct net_device *dev;
494 struct in_device *in_dev;
495 int err;
496
497 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy);
498 if (err < 0)
499 goto errout;
500
501 ifm = nlmsg_data(nlh);
502 err = -EINVAL;
503 if (ifm->ifa_prefixlen > 32 || tb[IFA_LOCAL] == NULL)
504 goto errout;
505
506 dev = __dev_get_by_index(net, ifm->ifa_index);
507 err = -ENODEV;
508 if (dev == NULL)
509 goto errout;
510
511 in_dev = __in_dev_get_rtnl(dev);
512 err = -ENOBUFS;
513 if (in_dev == NULL)
514 goto errout;
515
516 ifa = inet_alloc_ifa();
517 if (ifa == NULL)
518 /*
519 * A potential indev allocation can be left alive, it stays
520 * assigned to its device and is destroy with it.
521 */
522 goto errout;
523
524 ipv4_devconf_setall(in_dev);
525 in_dev_hold(in_dev);
526
527 if (tb[IFA_ADDRESS] == NULL)
528 tb[IFA_ADDRESS] = tb[IFA_LOCAL];
529
530 ifa->ifa_prefixlen = ifm->ifa_prefixlen;
531 ifa->ifa_mask = inet_make_mask(ifm->ifa_prefixlen);
532 ifa->ifa_flags = ifm->ifa_flags;
533 ifa->ifa_scope = ifm->ifa_scope;
534 ifa->ifa_dev = in_dev;
535
536 ifa->ifa_local = nla_get_be32(tb[IFA_LOCAL]);
537 ifa->ifa_address = nla_get_be32(tb[IFA_ADDRESS]);
538
539 if (tb[IFA_BROADCAST])
540 ifa->ifa_broadcast = nla_get_be32(tb[IFA_BROADCAST]);
541
542 if (tb[IFA_ANYCAST])
543 ifa->ifa_anycast = nla_get_be32(tb[IFA_ANYCAST]);
544
545 if (tb[IFA_LABEL])
546 nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ);
547 else
548 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
549
550 return ifa;
551
552 errout:
553 return ERR_PTR(err);
554 }
555
556 static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
557 {
558 struct net *net = skb->sk->sk_net;
559 struct in_ifaddr *ifa;
560
561 ASSERT_RTNL();
562
563 if (net != &init_net)
564 return -EINVAL;
565
566 ifa = rtm_to_ifaddr(net, nlh);
567 if (IS_ERR(ifa))
568 return PTR_ERR(ifa);
569
570 return __inet_insert_ifa(ifa, nlh, NETLINK_CB(skb).pid);
571 }
572
573 /*
574 * Determine a default network mask, based on the IP address.
575 */
576
577 static __inline__ int inet_abc_len(__be32 addr)
578 {
579 int rc = -1; /* Something else, probably a multicast. */
580
581 if (ipv4_is_zeronet(addr))
582 rc = 0;
583 else {
584 __u32 haddr = ntohl(addr);
585
586 if (IN_CLASSA(haddr))
587 rc = 8;
588 else if (IN_CLASSB(haddr))
589 rc = 16;
590 else if (IN_CLASSC(haddr))
591 rc = 24;
592 }
593
594 return rc;
595 }
596
597
598 int devinet_ioctl(unsigned int cmd, void __user *arg)
599 {
600 struct ifreq ifr;
601 struct sockaddr_in sin_orig;
602 struct sockaddr_in *sin = (struct sockaddr_in *)&ifr.ifr_addr;
603 struct in_device *in_dev;
604 struct in_ifaddr **ifap = NULL;
605 struct in_ifaddr *ifa = NULL;
606 struct net_device *dev;
607 char *colon;
608 int ret = -EFAULT;
609 int tryaddrmatch = 0;
610
611 /*
612 * Fetch the caller's info block into kernel space
613 */
614
615 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
616 goto out;
617 ifr.ifr_name[IFNAMSIZ - 1] = 0;
618
619 /* save original address for comparison */
620 memcpy(&sin_orig, sin, sizeof(*sin));
621
622 colon = strchr(ifr.ifr_name, ':');
623 if (colon)
624 *colon = 0;
625
626 #ifdef CONFIG_KMOD
627 dev_load(&init_net, ifr.ifr_name);
628 #endif
629
630 switch (cmd) {
631 case SIOCGIFADDR: /* Get interface address */
632 case SIOCGIFBRDADDR: /* Get the broadcast address */
633 case SIOCGIFDSTADDR: /* Get the destination address */
634 case SIOCGIFNETMASK: /* Get the netmask for the interface */
635 /* Note that these ioctls will not sleep,
636 so that we do not impose a lock.
637 One day we will be forced to put shlock here (I mean SMP)
638 */
639 tryaddrmatch = (sin_orig.sin_family == AF_INET);
640 memset(sin, 0, sizeof(*sin));
641 sin->sin_family = AF_INET;
642 break;
643
644 case SIOCSIFFLAGS:
645 ret = -EACCES;
646 if (!capable(CAP_NET_ADMIN))
647 goto out;
648 break;
649 case SIOCSIFADDR: /* Set interface address (and family) */
650 case SIOCSIFBRDADDR: /* Set the broadcast address */
651 case SIOCSIFDSTADDR: /* Set the destination address */
652 case SIOCSIFNETMASK: /* Set the netmask for the interface */
653 ret = -EACCES;
654 if (!capable(CAP_NET_ADMIN))
655 goto out;
656 ret = -EINVAL;
657 if (sin->sin_family != AF_INET)
658 goto out;
659 break;
660 default:
661 ret = -EINVAL;
662 goto out;
663 }
664
665 rtnl_lock();
666
667 ret = -ENODEV;
668 if ((dev = __dev_get_by_name(&init_net, ifr.ifr_name)) == NULL)
669 goto done;
670
671 if (colon)
672 *colon = ':';
673
674 if ((in_dev = __in_dev_get_rtnl(dev)) != NULL) {
675 if (tryaddrmatch) {
676 /* Matthias Andree */
677 /* compare label and address (4.4BSD style) */
678 /* note: we only do this for a limited set of ioctls
679 and only if the original address family was AF_INET.
680 This is checked above. */
681 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
682 ifap = &ifa->ifa_next) {
683 if (!strcmp(ifr.ifr_name, ifa->ifa_label) &&
684 sin_orig.sin_addr.s_addr ==
685 ifa->ifa_address) {
686 break; /* found */
687 }
688 }
689 }
690 /* we didn't get a match, maybe the application is
691 4.3BSD-style and passed in junk so we fall back to
692 comparing just the label */
693 if (!ifa) {
694 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
695 ifap = &ifa->ifa_next)
696 if (!strcmp(ifr.ifr_name, ifa->ifa_label))
697 break;
698 }
699 }
700
701 ret = -EADDRNOTAVAIL;
702 if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS)
703 goto done;
704
705 switch (cmd) {
706 case SIOCGIFADDR: /* Get interface address */
707 sin->sin_addr.s_addr = ifa->ifa_local;
708 goto rarok;
709
710 case SIOCGIFBRDADDR: /* Get the broadcast address */
711 sin->sin_addr.s_addr = ifa->ifa_broadcast;
712 goto rarok;
713
714 case SIOCGIFDSTADDR: /* Get the destination address */
715 sin->sin_addr.s_addr = ifa->ifa_address;
716 goto rarok;
717
718 case SIOCGIFNETMASK: /* Get the netmask for the interface */
719 sin->sin_addr.s_addr = ifa->ifa_mask;
720 goto rarok;
721
722 case SIOCSIFFLAGS:
723 if (colon) {
724 ret = -EADDRNOTAVAIL;
725 if (!ifa)
726 break;
727 ret = 0;
728 if (!(ifr.ifr_flags & IFF_UP))
729 inet_del_ifa(in_dev, ifap, 1);
730 break;
731 }
732 ret = dev_change_flags(dev, ifr.ifr_flags);
733 break;
734
735 case SIOCSIFADDR: /* Set interface address (and family) */
736 ret = -EINVAL;
737 if (inet_abc_len(sin->sin_addr.s_addr) < 0)
738 break;
739
740 if (!ifa) {
741 ret = -ENOBUFS;
742 if ((ifa = inet_alloc_ifa()) == NULL)
743 break;
744 if (colon)
745 memcpy(ifa->ifa_label, ifr.ifr_name, IFNAMSIZ);
746 else
747 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
748 } else {
749 ret = 0;
750 if (ifa->ifa_local == sin->sin_addr.s_addr)
751 break;
752 inet_del_ifa(in_dev, ifap, 0);
753 ifa->ifa_broadcast = 0;
754 ifa->ifa_anycast = 0;
755 ifa->ifa_scope = 0;
756 }
757
758 ifa->ifa_address = ifa->ifa_local = sin->sin_addr.s_addr;
759
760 if (!(dev->flags & IFF_POINTOPOINT)) {
761 ifa->ifa_prefixlen = inet_abc_len(ifa->ifa_address);
762 ifa->ifa_mask = inet_make_mask(ifa->ifa_prefixlen);
763 if ((dev->flags & IFF_BROADCAST) &&
764 ifa->ifa_prefixlen < 31)
765 ifa->ifa_broadcast = ifa->ifa_address |
766 ~ifa->ifa_mask;
767 } else {
768 ifa->ifa_prefixlen = 32;
769 ifa->ifa_mask = inet_make_mask(32);
770 }
771 ret = inet_set_ifa(dev, ifa);
772 break;
773
774 case SIOCSIFBRDADDR: /* Set the broadcast address */
775 ret = 0;
776 if (ifa->ifa_broadcast != sin->sin_addr.s_addr) {
777 inet_del_ifa(in_dev, ifap, 0);
778 ifa->ifa_broadcast = sin->sin_addr.s_addr;
779 inet_insert_ifa(ifa);
780 }
781 break;
782
783 case SIOCSIFDSTADDR: /* Set the destination address */
784 ret = 0;
785 if (ifa->ifa_address == sin->sin_addr.s_addr)
786 break;
787 ret = -EINVAL;
788 if (inet_abc_len(sin->sin_addr.s_addr) < 0)
789 break;
790 ret = 0;
791 inet_del_ifa(in_dev, ifap, 0);
792 ifa->ifa_address = sin->sin_addr.s_addr;
793 inet_insert_ifa(ifa);
794 break;
795
796 case SIOCSIFNETMASK: /* Set the netmask for the interface */
797
798 /*
799 * The mask we set must be legal.
800 */
801 ret = -EINVAL;
802 if (bad_mask(sin->sin_addr.s_addr, 0))
803 break;
804 ret = 0;
805 if (ifa->ifa_mask != sin->sin_addr.s_addr) {
806 __be32 old_mask = ifa->ifa_mask;
807 inet_del_ifa(in_dev, ifap, 0);
808 ifa->ifa_mask = sin->sin_addr.s_addr;
809 ifa->ifa_prefixlen = inet_mask_len(ifa->ifa_mask);
810
811 /* See if current broadcast address matches
812 * with current netmask, then recalculate
813 * the broadcast address. Otherwise it's a
814 * funny address, so don't touch it since
815 * the user seems to know what (s)he's doing...
816 */
817 if ((dev->flags & IFF_BROADCAST) &&
818 (ifa->ifa_prefixlen < 31) &&
819 (ifa->ifa_broadcast ==
820 (ifa->ifa_local|~old_mask))) {
821 ifa->ifa_broadcast = (ifa->ifa_local |
822 ~sin->sin_addr.s_addr);
823 }
824 inet_insert_ifa(ifa);
825 }
826 break;
827 }
828 done:
829 rtnl_unlock();
830 out:
831 return ret;
832 rarok:
833 rtnl_unlock();
834 ret = copy_to_user(arg, &ifr, sizeof(struct ifreq)) ? -EFAULT : 0;
835 goto out;
836 }
837
838 static int inet_gifconf(struct net_device *dev, char __user *buf, int len)
839 {
840 struct in_device *in_dev = __in_dev_get_rtnl(dev);
841 struct in_ifaddr *ifa;
842 struct ifreq ifr;
843 int done = 0;
844
845 if (!in_dev || (ifa = in_dev->ifa_list) == NULL)
846 goto out;
847
848 for (; ifa; ifa = ifa->ifa_next) {
849 if (!buf) {
850 done += sizeof(ifr);
851 continue;
852 }
853 if (len < (int) sizeof(ifr))
854 break;
855 memset(&ifr, 0, sizeof(struct ifreq));
856 if (ifa->ifa_label)
857 strcpy(ifr.ifr_name, ifa->ifa_label);
858 else
859 strcpy(ifr.ifr_name, dev->name);
860
861 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_family = AF_INET;
862 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_addr.s_addr =
863 ifa->ifa_local;
864
865 if (copy_to_user(buf, &ifr, sizeof(struct ifreq))) {
866 done = -EFAULT;
867 break;
868 }
869 buf += sizeof(struct ifreq);
870 len -= sizeof(struct ifreq);
871 done += sizeof(struct ifreq);
872 }
873 out:
874 return done;
875 }
876
877 __be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope)
878 {
879 __be32 addr = 0;
880 struct in_device *in_dev;
881
882 rcu_read_lock();
883 in_dev = __in_dev_get_rcu(dev);
884 if (!in_dev)
885 goto no_in_dev;
886
887 for_primary_ifa(in_dev) {
888 if (ifa->ifa_scope > scope)
889 continue;
890 if (!dst || inet_ifa_match(dst, ifa)) {
891 addr = ifa->ifa_local;
892 break;
893 }
894 if (!addr)
895 addr = ifa->ifa_local;
896 } endfor_ifa(in_dev);
897 no_in_dev:
898 rcu_read_unlock();
899
900 if (addr)
901 goto out;
902
903 /* Not loopback addresses on loopback should be preferred
904 in this case. It is importnat that lo is the first interface
905 in dev_base list.
906 */
907 read_lock(&dev_base_lock);
908 rcu_read_lock();
909 for_each_netdev(&init_net, dev) {
910 if ((in_dev = __in_dev_get_rcu(dev)) == NULL)
911 continue;
912
913 for_primary_ifa(in_dev) {
914 if (ifa->ifa_scope != RT_SCOPE_LINK &&
915 ifa->ifa_scope <= scope) {
916 addr = ifa->ifa_local;
917 goto out_unlock_both;
918 }
919 } endfor_ifa(in_dev);
920 }
921 out_unlock_both:
922 read_unlock(&dev_base_lock);
923 rcu_read_unlock();
924 out:
925 return addr;
926 }
927
928 static __be32 confirm_addr_indev(struct in_device *in_dev, __be32 dst,
929 __be32 local, int scope)
930 {
931 int same = 0;
932 __be32 addr = 0;
933
934 for_ifa(in_dev) {
935 if (!addr &&
936 (local == ifa->ifa_local || !local) &&
937 ifa->ifa_scope <= scope) {
938 addr = ifa->ifa_local;
939 if (same)
940 break;
941 }
942 if (!same) {
943 same = (!local || inet_ifa_match(local, ifa)) &&
944 (!dst || inet_ifa_match(dst, ifa));
945 if (same && addr) {
946 if (local || !dst)
947 break;
948 /* Is the selected addr into dst subnet? */
949 if (inet_ifa_match(addr, ifa))
950 break;
951 /* No, then can we use new local src? */
952 if (ifa->ifa_scope <= scope) {
953 addr = ifa->ifa_local;
954 break;
955 }
956 /* search for large dst subnet for addr */
957 same = 0;
958 }
959 }
960 } endfor_ifa(in_dev);
961
962 return same? addr : 0;
963 }
964
965 /*
966 * Confirm that local IP address exists using wildcards:
967 * - in_dev: only on this interface, 0=any interface
968 * - dst: only in the same subnet as dst, 0=any dst
969 * - local: address, 0=autoselect the local address
970 * - scope: maximum allowed scope value for the local address
971 */
972 __be32 inet_confirm_addr(struct in_device *in_dev,
973 __be32 dst, __be32 local, int scope)
974 {
975 __be32 addr = 0;
976 struct net_device *dev;
977 struct net *net;
978
979 if (scope != RT_SCOPE_LINK)
980 return confirm_addr_indev(in_dev, dst, local, scope);
981
982 net = in_dev->dev->nd_net;
983 read_lock(&dev_base_lock);
984 rcu_read_lock();
985 for_each_netdev(net, dev) {
986 if ((in_dev = __in_dev_get_rcu(dev))) {
987 addr = confirm_addr_indev(in_dev, dst, local, scope);
988 if (addr)
989 break;
990 }
991 }
992 rcu_read_unlock();
993 read_unlock(&dev_base_lock);
994
995 return addr;
996 }
997
998 /*
999 * Device notifier
1000 */
1001
1002 int register_inetaddr_notifier(struct notifier_block *nb)
1003 {
1004 return blocking_notifier_chain_register(&inetaddr_chain, nb);
1005 }
1006
1007 int unregister_inetaddr_notifier(struct notifier_block *nb)
1008 {
1009 return blocking_notifier_chain_unregister(&inetaddr_chain, nb);
1010 }
1011
1012 /* Rename ifa_labels for a device name change. Make some effort to preserve existing
1013 * alias numbering and to create unique labels if possible.
1014 */
1015 static void inetdev_changename(struct net_device *dev, struct in_device *in_dev)
1016 {
1017 struct in_ifaddr *ifa;
1018 int named = 0;
1019
1020 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1021 char old[IFNAMSIZ], *dot;
1022
1023 memcpy(old, ifa->ifa_label, IFNAMSIZ);
1024 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1025 if (named++ == 0)
1026 continue;
1027 dot = strchr(old, ':');
1028 if (dot == NULL) {
1029 sprintf(old, ":%d", named);
1030 dot = old;
1031 }
1032 if (strlen(dot) + strlen(dev->name) < IFNAMSIZ) {
1033 strcat(ifa->ifa_label, dot);
1034 } else {
1035 strcpy(ifa->ifa_label + (IFNAMSIZ - strlen(dot) - 1), dot);
1036 }
1037 }
1038 }
1039
1040 /* Called only under RTNL semaphore */
1041
1042 static int inetdev_event(struct notifier_block *this, unsigned long event,
1043 void *ptr)
1044 {
1045 struct net_device *dev = ptr;
1046 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1047
1048 if (dev->nd_net != &init_net)
1049 return NOTIFY_DONE;
1050
1051 ASSERT_RTNL();
1052
1053 if (!in_dev) {
1054 if (event == NETDEV_REGISTER) {
1055 in_dev = inetdev_init(dev);
1056 if (!in_dev)
1057 return notifier_from_errno(-ENOMEM);
1058 if (dev->flags & IFF_LOOPBACK) {
1059 IN_DEV_CONF_SET(in_dev, NOXFRM, 1);
1060 IN_DEV_CONF_SET(in_dev, NOPOLICY, 1);
1061 }
1062 }
1063 goto out;
1064 }
1065
1066 switch (event) {
1067 case NETDEV_REGISTER:
1068 printk(KERN_DEBUG "inetdev_event: bug\n");
1069 dev->ip_ptr = NULL;
1070 break;
1071 case NETDEV_UP:
1072 if (dev->mtu < 68)
1073 break;
1074 if (dev->flags & IFF_LOOPBACK) {
1075 struct in_ifaddr *ifa;
1076 if ((ifa = inet_alloc_ifa()) != NULL) {
1077 ifa->ifa_local =
1078 ifa->ifa_address = htonl(INADDR_LOOPBACK);
1079 ifa->ifa_prefixlen = 8;
1080 ifa->ifa_mask = inet_make_mask(8);
1081 in_dev_hold(in_dev);
1082 ifa->ifa_dev = in_dev;
1083 ifa->ifa_scope = RT_SCOPE_HOST;
1084 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1085 inet_insert_ifa(ifa);
1086 }
1087 }
1088 ip_mc_up(in_dev);
1089 break;
1090 case NETDEV_DOWN:
1091 ip_mc_down(in_dev);
1092 break;
1093 case NETDEV_CHANGEMTU:
1094 if (dev->mtu >= 68)
1095 break;
1096 /* MTU falled under 68, disable IP */
1097 case NETDEV_UNREGISTER:
1098 inetdev_destroy(in_dev);
1099 break;
1100 case NETDEV_CHANGENAME:
1101 /* Do not notify about label change, this event is
1102 * not interesting to applications using netlink.
1103 */
1104 inetdev_changename(dev, in_dev);
1105
1106 devinet_sysctl_unregister(in_dev);
1107 devinet_sysctl_register(in_dev);
1108 break;
1109 }
1110 out:
1111 return NOTIFY_DONE;
1112 }
1113
1114 static struct notifier_block ip_netdev_notifier = {
1115 .notifier_call =inetdev_event,
1116 };
1117
1118 static inline size_t inet_nlmsg_size(void)
1119 {
1120 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
1121 + nla_total_size(4) /* IFA_ADDRESS */
1122 + nla_total_size(4) /* IFA_LOCAL */
1123 + nla_total_size(4) /* IFA_BROADCAST */
1124 + nla_total_size(4) /* IFA_ANYCAST */
1125 + nla_total_size(IFNAMSIZ); /* IFA_LABEL */
1126 }
1127
1128 static int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa,
1129 u32 pid, u32 seq, int event, unsigned int flags)
1130 {
1131 struct ifaddrmsg *ifm;
1132 struct nlmsghdr *nlh;
1133
1134 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*ifm), flags);
1135 if (nlh == NULL)
1136 return -EMSGSIZE;
1137
1138 ifm = nlmsg_data(nlh);
1139 ifm->ifa_family = AF_INET;
1140 ifm->ifa_prefixlen = ifa->ifa_prefixlen;
1141 ifm->ifa_flags = ifa->ifa_flags|IFA_F_PERMANENT;
1142 ifm->ifa_scope = ifa->ifa_scope;
1143 ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
1144
1145 if (ifa->ifa_address)
1146 NLA_PUT_BE32(skb, IFA_ADDRESS, ifa->ifa_address);
1147
1148 if (ifa->ifa_local)
1149 NLA_PUT_BE32(skb, IFA_LOCAL, ifa->ifa_local);
1150
1151 if (ifa->ifa_broadcast)
1152 NLA_PUT_BE32(skb, IFA_BROADCAST, ifa->ifa_broadcast);
1153
1154 if (ifa->ifa_anycast)
1155 NLA_PUT_BE32(skb, IFA_ANYCAST, ifa->ifa_anycast);
1156
1157 if (ifa->ifa_label[0])
1158 NLA_PUT_STRING(skb, IFA_LABEL, ifa->ifa_label);
1159
1160 return nlmsg_end(skb, nlh);
1161
1162 nla_put_failure:
1163 nlmsg_cancel(skb, nlh);
1164 return -EMSGSIZE;
1165 }
1166
1167 static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
1168 {
1169 struct net *net = skb->sk->sk_net;
1170 int idx, ip_idx;
1171 struct net_device *dev;
1172 struct in_device *in_dev;
1173 struct in_ifaddr *ifa;
1174 int s_ip_idx, s_idx = cb->args[0];
1175
1176 if (net != &init_net)
1177 return 0;
1178
1179 s_ip_idx = ip_idx = cb->args[1];
1180 idx = 0;
1181 for_each_netdev(net, dev) {
1182 if (idx < s_idx)
1183 goto cont;
1184 if (idx > s_idx)
1185 s_ip_idx = 0;
1186 if ((in_dev = __in_dev_get_rtnl(dev)) == NULL)
1187 goto cont;
1188
1189 for (ifa = in_dev->ifa_list, ip_idx = 0; ifa;
1190 ifa = ifa->ifa_next, ip_idx++) {
1191 if (ip_idx < s_ip_idx)
1192 continue;
1193 if (inet_fill_ifaddr(skb, ifa, NETLINK_CB(cb->skb).pid,
1194 cb->nlh->nlmsg_seq,
1195 RTM_NEWADDR, NLM_F_MULTI) <= 0)
1196 goto done;
1197 }
1198 cont:
1199 idx++;
1200 }
1201
1202 done:
1203 cb->args[0] = idx;
1204 cb->args[1] = ip_idx;
1205
1206 return skb->len;
1207 }
1208
1209 static void rtmsg_ifa(int event, struct in_ifaddr* ifa, struct nlmsghdr *nlh,
1210 u32 pid)
1211 {
1212 struct sk_buff *skb;
1213 u32 seq = nlh ? nlh->nlmsg_seq : 0;
1214 int err = -ENOBUFS;
1215 struct net *net;
1216
1217 net = ifa->ifa_dev->dev->nd_net;
1218 skb = nlmsg_new(inet_nlmsg_size(), GFP_KERNEL);
1219 if (skb == NULL)
1220 goto errout;
1221
1222 err = inet_fill_ifaddr(skb, ifa, pid, seq, event, 0);
1223 if (err < 0) {
1224 /* -EMSGSIZE implies BUG in inet_nlmsg_size() */
1225 WARN_ON(err == -EMSGSIZE);
1226 kfree_skb(skb);
1227 goto errout;
1228 }
1229 err = rtnl_notify(skb, net, pid, RTNLGRP_IPV4_IFADDR, nlh, GFP_KERNEL);
1230 errout:
1231 if (err < 0)
1232 rtnl_set_sk_err(net, RTNLGRP_IPV4_IFADDR, err);
1233 }
1234
1235 #ifdef CONFIG_SYSCTL
1236
1237 static void devinet_copy_dflt_conf(struct net *net, int i)
1238 {
1239 struct net_device *dev;
1240
1241 read_lock(&dev_base_lock);
1242 for_each_netdev(net, dev) {
1243 struct in_device *in_dev;
1244 rcu_read_lock();
1245 in_dev = __in_dev_get_rcu(dev);
1246 if (in_dev && !test_bit(i, in_dev->cnf.state))
1247 in_dev->cnf.data[i] = net->ipv4.devconf_dflt->data[i];
1248 rcu_read_unlock();
1249 }
1250 read_unlock(&dev_base_lock);
1251 }
1252
1253 static void inet_forward_change(struct net *net)
1254 {
1255 struct net_device *dev;
1256 int on = IPV4_DEVCONF_ALL(net, FORWARDING);
1257
1258 IPV4_DEVCONF_ALL(net, ACCEPT_REDIRECTS) = !on;
1259 IPV4_DEVCONF_DFLT(net, FORWARDING) = on;
1260
1261 read_lock(&dev_base_lock);
1262 for_each_netdev(net, dev) {
1263 struct in_device *in_dev;
1264 rcu_read_lock();
1265 in_dev = __in_dev_get_rcu(dev);
1266 if (in_dev)
1267 IN_DEV_CONF_SET(in_dev, FORWARDING, on);
1268 rcu_read_unlock();
1269 }
1270 read_unlock(&dev_base_lock);
1271
1272 rt_cache_flush(0);
1273 }
1274
1275 static int devinet_conf_proc(ctl_table *ctl, int write,
1276 struct file* filp, void __user *buffer,
1277 size_t *lenp, loff_t *ppos)
1278 {
1279 int ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
1280
1281 if (write) {
1282 struct ipv4_devconf *cnf = ctl->extra1;
1283 struct net *net = ctl->extra2;
1284 int i = (int *)ctl->data - cnf->data;
1285
1286 set_bit(i, cnf->state);
1287
1288 if (cnf == net->ipv4.devconf_dflt)
1289 devinet_copy_dflt_conf(net, i);
1290 }
1291
1292 return ret;
1293 }
1294
1295 static int devinet_conf_sysctl(ctl_table *table, int __user *name, int nlen,
1296 void __user *oldval, size_t __user *oldlenp,
1297 void __user *newval, size_t newlen)
1298 {
1299 struct ipv4_devconf *cnf;
1300 struct net *net;
1301 int *valp = table->data;
1302 int new;
1303 int i;
1304
1305 if (!newval || !newlen)
1306 return 0;
1307
1308 if (newlen != sizeof(int))
1309 return -EINVAL;
1310
1311 if (get_user(new, (int __user *)newval))
1312 return -EFAULT;
1313
1314 if (new == *valp)
1315 return 0;
1316
1317 if (oldval && oldlenp) {
1318 size_t len;
1319
1320 if (get_user(len, oldlenp))
1321 return -EFAULT;
1322
1323 if (len) {
1324 if (len > table->maxlen)
1325 len = table->maxlen;
1326 if (copy_to_user(oldval, valp, len))
1327 return -EFAULT;
1328 if (put_user(len, oldlenp))
1329 return -EFAULT;
1330 }
1331 }
1332
1333 *valp = new;
1334
1335 cnf = table->extra1;
1336 net = table->extra2;
1337 i = (int *)table->data - cnf->data;
1338
1339 set_bit(i, cnf->state);
1340
1341 if (cnf == net->ipv4.devconf_dflt)
1342 devinet_copy_dflt_conf(net, i);
1343
1344 return 1;
1345 }
1346
1347 static int devinet_sysctl_forward(ctl_table *ctl, int write,
1348 struct file* filp, void __user *buffer,
1349 size_t *lenp, loff_t *ppos)
1350 {
1351 int *valp = ctl->data;
1352 int val = *valp;
1353 int ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
1354
1355 if (write && *valp != val) {
1356 struct net *net = ctl->extra2;
1357
1358 if (valp == &IPV4_DEVCONF_ALL(net, FORWARDING))
1359 inet_forward_change(net);
1360 else if (valp != &IPV4_DEVCONF_DFLT(net, FORWARDING))
1361 rt_cache_flush(0);
1362 }
1363
1364 return ret;
1365 }
1366
1367 int ipv4_doint_and_flush(ctl_table *ctl, int write,
1368 struct file* filp, void __user *buffer,
1369 size_t *lenp, loff_t *ppos)
1370 {
1371 int *valp = ctl->data;
1372 int val = *valp;
1373 int ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
1374
1375 if (write && *valp != val)
1376 rt_cache_flush(0);
1377
1378 return ret;
1379 }
1380
1381 int ipv4_doint_and_flush_strategy(ctl_table *table, int __user *name, int nlen,
1382 void __user *oldval, size_t __user *oldlenp,
1383 void __user *newval, size_t newlen)
1384 {
1385 int ret = devinet_conf_sysctl(table, name, nlen, oldval, oldlenp,
1386 newval, newlen);
1387
1388 if (ret == 1)
1389 rt_cache_flush(0);
1390
1391 return ret;
1392 }
1393
1394
1395 #define DEVINET_SYSCTL_ENTRY(attr, name, mval, proc, sysctl) \
1396 { \
1397 .ctl_name = NET_IPV4_CONF_ ## attr, \
1398 .procname = name, \
1399 .data = ipv4_devconf.data + \
1400 NET_IPV4_CONF_ ## attr - 1, \
1401 .maxlen = sizeof(int), \
1402 .mode = mval, \
1403 .proc_handler = proc, \
1404 .strategy = sysctl, \
1405 .extra1 = &ipv4_devconf, \
1406 }
1407
1408 #define DEVINET_SYSCTL_RW_ENTRY(attr, name) \
1409 DEVINET_SYSCTL_ENTRY(attr, name, 0644, devinet_conf_proc, \
1410 devinet_conf_sysctl)
1411
1412 #define DEVINET_SYSCTL_RO_ENTRY(attr, name) \
1413 DEVINET_SYSCTL_ENTRY(attr, name, 0444, devinet_conf_proc, \
1414 devinet_conf_sysctl)
1415
1416 #define DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, proc, sysctl) \
1417 DEVINET_SYSCTL_ENTRY(attr, name, 0644, proc, sysctl)
1418
1419 #define DEVINET_SYSCTL_FLUSHING_ENTRY(attr, name) \
1420 DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, ipv4_doint_and_flush, \
1421 ipv4_doint_and_flush_strategy)
1422
1423 static struct devinet_sysctl_table {
1424 struct ctl_table_header *sysctl_header;
1425 struct ctl_table devinet_vars[__NET_IPV4_CONF_MAX];
1426 char *dev_name;
1427 } devinet_sysctl = {
1428 .devinet_vars = {
1429 DEVINET_SYSCTL_COMPLEX_ENTRY(FORWARDING, "forwarding",
1430 devinet_sysctl_forward,
1431 devinet_conf_sysctl),
1432 DEVINET_SYSCTL_RO_ENTRY(MC_FORWARDING, "mc_forwarding"),
1433
1434 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_REDIRECTS, "accept_redirects"),
1435 DEVINET_SYSCTL_RW_ENTRY(SECURE_REDIRECTS, "secure_redirects"),
1436 DEVINET_SYSCTL_RW_ENTRY(SHARED_MEDIA, "shared_media"),
1437 DEVINET_SYSCTL_RW_ENTRY(RP_FILTER, "rp_filter"),
1438 DEVINET_SYSCTL_RW_ENTRY(SEND_REDIRECTS, "send_redirects"),
1439 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_SOURCE_ROUTE,
1440 "accept_source_route"),
1441 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP, "proxy_arp"),
1442 DEVINET_SYSCTL_RW_ENTRY(MEDIUM_ID, "medium_id"),
1443 DEVINET_SYSCTL_RW_ENTRY(BOOTP_RELAY, "bootp_relay"),
1444 DEVINET_SYSCTL_RW_ENTRY(LOG_MARTIANS, "log_martians"),
1445 DEVINET_SYSCTL_RW_ENTRY(TAG, "tag"),
1446 DEVINET_SYSCTL_RW_ENTRY(ARPFILTER, "arp_filter"),
1447 DEVINET_SYSCTL_RW_ENTRY(ARP_ANNOUNCE, "arp_announce"),
1448 DEVINET_SYSCTL_RW_ENTRY(ARP_IGNORE, "arp_ignore"),
1449 DEVINET_SYSCTL_RW_ENTRY(ARP_ACCEPT, "arp_accept"),
1450
1451 DEVINET_SYSCTL_FLUSHING_ENTRY(NOXFRM, "disable_xfrm"),
1452 DEVINET_SYSCTL_FLUSHING_ENTRY(NOPOLICY, "disable_policy"),
1453 DEVINET_SYSCTL_FLUSHING_ENTRY(FORCE_IGMP_VERSION,
1454 "force_igmp_version"),
1455 DEVINET_SYSCTL_FLUSHING_ENTRY(PROMOTE_SECONDARIES,
1456 "promote_secondaries"),
1457 },
1458 };
1459
1460 static int __devinet_sysctl_register(struct net *net, char *dev_name,
1461 int ctl_name, struct ipv4_devconf *p)
1462 {
1463 int i;
1464 struct devinet_sysctl_table *t;
1465
1466 #define DEVINET_CTL_PATH_DEV 3
1467
1468 struct ctl_path devinet_ctl_path[] = {
1469 { .procname = "net", .ctl_name = CTL_NET, },
1470 { .procname = "ipv4", .ctl_name = NET_IPV4, },
1471 { .procname = "conf", .ctl_name = NET_IPV4_CONF, },
1472 { /* to be set */ },
1473 { },
1474 };
1475
1476 t = kmemdup(&devinet_sysctl, sizeof(*t), GFP_KERNEL);
1477 if (!t)
1478 goto out;
1479
1480 for (i = 0; i < ARRAY_SIZE(t->devinet_vars) - 1; i++) {
1481 t->devinet_vars[i].data += (char *)p - (char *)&ipv4_devconf;
1482 t->devinet_vars[i].extra1 = p;
1483 t->devinet_vars[i].extra2 = net;
1484 }
1485
1486 /*
1487 * Make a copy of dev_name, because '.procname' is regarded as const
1488 * by sysctl and we wouldn't want anyone to change it under our feet
1489 * (see SIOCSIFNAME).
1490 */
1491 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
1492 if (!t->dev_name)
1493 goto free;
1494
1495 devinet_ctl_path[DEVINET_CTL_PATH_DEV].procname = t->dev_name;
1496 devinet_ctl_path[DEVINET_CTL_PATH_DEV].ctl_name = ctl_name;
1497
1498 t->sysctl_header = register_net_sysctl_table(net, devinet_ctl_path,
1499 t->devinet_vars);
1500 if (!t->sysctl_header)
1501 goto free_procname;
1502
1503 p->sysctl = t;
1504 return 0;
1505
1506 free_procname:
1507 kfree(t->dev_name);
1508 free:
1509 kfree(t);
1510 out:
1511 return -ENOBUFS;
1512 }
1513
1514 static void __devinet_sysctl_unregister(struct ipv4_devconf *cnf)
1515 {
1516 struct devinet_sysctl_table *t = cnf->sysctl;
1517
1518 if (t == NULL)
1519 return;
1520
1521 cnf->sysctl = NULL;
1522 unregister_sysctl_table(t->sysctl_header);
1523 kfree(t->dev_name);
1524 kfree(t);
1525 }
1526
1527 static void devinet_sysctl_register(struct in_device *idev)
1528 {
1529 neigh_sysctl_register(idev->dev, idev->arp_parms, NET_IPV4,
1530 NET_IPV4_NEIGH, "ipv4", NULL, NULL);
1531 __devinet_sysctl_register(idev->dev->nd_net, idev->dev->name,
1532 idev->dev->ifindex, &idev->cnf);
1533 }
1534
1535 static void devinet_sysctl_unregister(struct in_device *idev)
1536 {
1537 __devinet_sysctl_unregister(&idev->cnf);
1538 neigh_sysctl_unregister(idev->arp_parms);
1539 }
1540
1541 static struct ctl_table ctl_forward_entry[] = {
1542 {
1543 .ctl_name = NET_IPV4_FORWARD,
1544 .procname = "ip_forward",
1545 .data = &ipv4_devconf.data[
1546 NET_IPV4_CONF_FORWARDING - 1],
1547 .maxlen = sizeof(int),
1548 .mode = 0644,
1549 .proc_handler = devinet_sysctl_forward,
1550 .strategy = devinet_conf_sysctl,
1551 .extra1 = &ipv4_devconf,
1552 .extra2 = &init_net,
1553 },
1554 { },
1555 };
1556
1557 static __net_initdata struct ctl_path net_ipv4_path[] = {
1558 { .procname = "net", .ctl_name = CTL_NET, },
1559 { .procname = "ipv4", .ctl_name = NET_IPV4, },
1560 { },
1561 };
1562 #endif
1563
1564 static __net_init int devinet_init_net(struct net *net)
1565 {
1566 int err;
1567 struct ipv4_devconf *all, *dflt;
1568 #ifdef CONFIG_SYSCTL
1569 struct ctl_table *tbl = ctl_forward_entry;
1570 struct ctl_table_header *forw_hdr;
1571 #endif
1572
1573 err = -ENOMEM;
1574 all = &ipv4_devconf;
1575 dflt = &ipv4_devconf_dflt;
1576
1577 if (net != &init_net) {
1578 all = kmemdup(all, sizeof(ipv4_devconf), GFP_KERNEL);
1579 if (all == NULL)
1580 goto err_alloc_all;
1581
1582 dflt = kmemdup(dflt, sizeof(ipv4_devconf_dflt), GFP_KERNEL);
1583 if (dflt == NULL)
1584 goto err_alloc_dflt;
1585
1586 #ifdef CONFIG_SYSCTL
1587 tbl = kmemdup(tbl, sizeof(ctl_forward_entry), GFP_KERNEL);
1588 if (tbl == NULL)
1589 goto err_alloc_ctl;
1590
1591 tbl[0].data = &all->data[NET_IPV4_CONF_FORWARDING - 1];
1592 tbl[0].extra1 = all;
1593 tbl[0].extra2 = net;
1594 #endif
1595 }
1596
1597 #ifdef CONFIG_SYSCTL
1598 err = __devinet_sysctl_register(net, "all",
1599 NET_PROTO_CONF_ALL, all);
1600 if (err < 0)
1601 goto err_reg_all;
1602
1603 err = __devinet_sysctl_register(net, "default",
1604 NET_PROTO_CONF_DEFAULT, dflt);
1605 if (err < 0)
1606 goto err_reg_dflt;
1607
1608 err = -ENOMEM;
1609 forw_hdr = register_net_sysctl_table(net, net_ipv4_path, tbl);
1610 if (forw_hdr == NULL)
1611 goto err_reg_ctl;
1612 net->ipv4.forw_hdr = forw_hdr;
1613 #endif
1614
1615 net->ipv4.devconf_all = all;
1616 net->ipv4.devconf_dflt = dflt;
1617 return 0;
1618
1619 #ifdef CONFIG_SYSCTL
1620 err_reg_ctl:
1621 __devinet_sysctl_unregister(dflt);
1622 err_reg_dflt:
1623 __devinet_sysctl_unregister(all);
1624 err_reg_all:
1625 if (tbl != ctl_forward_entry)
1626 kfree(tbl);
1627 err_alloc_ctl:
1628 #endif
1629 if (dflt != &ipv4_devconf_dflt)
1630 kfree(dflt);
1631 err_alloc_dflt:
1632 if (all != &ipv4_devconf)
1633 kfree(all);
1634 err_alloc_all:
1635 return err;
1636 }
1637
1638 static __net_exit void devinet_exit_net(struct net *net)
1639 {
1640 #ifdef CONFIG_SYSCTL
1641 struct ctl_table *tbl;
1642
1643 tbl = net->ipv4.forw_hdr->ctl_table_arg;
1644 unregister_net_sysctl_table(net->ipv4.forw_hdr);
1645 __devinet_sysctl_unregister(net->ipv4.devconf_dflt);
1646 __devinet_sysctl_unregister(net->ipv4.devconf_all);
1647 kfree(tbl);
1648 #endif
1649 kfree(net->ipv4.devconf_dflt);
1650 kfree(net->ipv4.devconf_all);
1651 }
1652
1653 static __net_initdata struct pernet_operations devinet_ops = {
1654 .init = devinet_init_net,
1655 .exit = devinet_exit_net,
1656 };
1657
1658 void __init devinet_init(void)
1659 {
1660 register_pernet_subsys(&devinet_ops);
1661
1662 register_gifconf(PF_INET, inet_gifconf);
1663 register_netdevice_notifier(&ip_netdev_notifier);
1664
1665 rtnl_register(PF_INET, RTM_NEWADDR, inet_rtm_newaddr, NULL);
1666 rtnl_register(PF_INET, RTM_DELADDR, inet_rtm_deladdr, NULL);
1667 rtnl_register(PF_INET, RTM_GETADDR, NULL, inet_dump_ifaddr);
1668 }
1669
1670 EXPORT_SYMBOL(in_dev_finish_destroy);
1671 EXPORT_SYMBOL(inet_select_addr);
1672 EXPORT_SYMBOL(inetdev_by_index);
1673 EXPORT_SYMBOL(register_inetaddr_notifier);
1674 EXPORT_SYMBOL(unregister_inetaddr_notifier);
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