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[IPV4]: Remove extra argument from arp_ignore.
[deliverable/linux.git] / net / ipv4 / devinet.c
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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
67struct 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
76static 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
89static 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
97static void rtmsg_ifa(int event, struct in_ifaddr *, struct nlmsghdr *, u32);
98
99static BLOCKING_NOTIFIER_HEAD(inetaddr_chain);
100static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
101 int destroy);
102#ifdef CONFIG_SYSCTL
103static void devinet_sysctl_register(struct in_device *idev);
104static void devinet_sysctl_unregister(struct in_device *idev);
105#else
106static inline void devinet_sysctl_register(struct in_device *idev)
107{
108}
109static inline void devinet_sysctl_unregister(struct in_device *idev)
110{
111}
112#endif
113
114/* Locks all the inet devices. */
115
116static 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
127static 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
135static inline void inet_free_ifa(struct in_ifaddr *ifa)
136{
137 call_rcu(&ifa->rcu_head, inet_rcu_free_ifa);
138}
139
140void 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
158static 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);
186out:
187 return in_dev;
188out_kfree:
189 kfree(in_dev);
190 in_dev = NULL;
191 goto out;
192}
193
194static 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
200static 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
227int 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
242static 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
328static 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
334static 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
386static int inet_insert_ifa(struct in_ifaddr *ifa)
387{
388 return __inet_insert_ifa(ifa, NULL, 0);
389}
390
391static 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
412struct in_device *inetdev_by_index(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(&init_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
426struct 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
438static 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(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;
484errout:
485 return err;
486}
487
488static struct in_ifaddr *rtm_to_ifaddr(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 = -EINVAL;
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 if (ifm->ifa_prefixlen > 32 || tb[IFA_LOCAL] == NULL) {
503 err = -EINVAL;
504 goto errout;
505 }
506
507 dev = __dev_get_by_index(&init_net, ifm->ifa_index);
508 if (dev == NULL) {
509 err = -ENODEV;
510 goto errout;
511 }
512
513 in_dev = __in_dev_get_rtnl(dev);
514 if (in_dev == NULL) {
515 err = -ENOBUFS;
516 goto errout;
517 }
518
519 ifa = inet_alloc_ifa();
520 if (ifa == NULL) {
521 /*
522 * A potential indev allocation can be left alive, it stays
523 * assigned to its device and is destroy with it.
524 */
525 err = -ENOBUFS;
526 goto errout;
527 }
528
529 ipv4_devconf_setall(in_dev);
530 in_dev_hold(in_dev);
531
532 if (tb[IFA_ADDRESS] == NULL)
533 tb[IFA_ADDRESS] = tb[IFA_LOCAL];
534
535 ifa->ifa_prefixlen = ifm->ifa_prefixlen;
536 ifa->ifa_mask = inet_make_mask(ifm->ifa_prefixlen);
537 ifa->ifa_flags = ifm->ifa_flags;
538 ifa->ifa_scope = ifm->ifa_scope;
539 ifa->ifa_dev = in_dev;
540
541 ifa->ifa_local = nla_get_be32(tb[IFA_LOCAL]);
542 ifa->ifa_address = nla_get_be32(tb[IFA_ADDRESS]);
543
544 if (tb[IFA_BROADCAST])
545 ifa->ifa_broadcast = nla_get_be32(tb[IFA_BROADCAST]);
546
547 if (tb[IFA_ANYCAST])
548 ifa->ifa_anycast = nla_get_be32(tb[IFA_ANYCAST]);
549
550 if (tb[IFA_LABEL])
551 nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ);
552 else
553 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
554
555 return ifa;
556
557errout:
558 return ERR_PTR(err);
559}
560
561static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
562{
563 struct net *net = skb->sk->sk_net;
564 struct in_ifaddr *ifa;
565
566 ASSERT_RTNL();
567
568 if (net != &init_net)
569 return -EINVAL;
570
571 ifa = rtm_to_ifaddr(nlh);
572 if (IS_ERR(ifa))
573 return PTR_ERR(ifa);
574
575 return __inet_insert_ifa(ifa, nlh, NETLINK_CB(skb).pid);
576}
577
578/*
579 * Determine a default network mask, based on the IP address.
580 */
581
582static __inline__ int inet_abc_len(__be32 addr)
583{
584 int rc = -1; /* Something else, probably a multicast. */
585
586 if (ipv4_is_zeronet(addr))
587 rc = 0;
588 else {
589 __u32 haddr = ntohl(addr);
590
591 if (IN_CLASSA(haddr))
592 rc = 8;
593 else if (IN_CLASSB(haddr))
594 rc = 16;
595 else if (IN_CLASSC(haddr))
596 rc = 24;
597 }
598
599 return rc;
600}
601
602
603int devinet_ioctl(unsigned int cmd, void __user *arg)
604{
605 struct ifreq ifr;
606 struct sockaddr_in sin_orig;
607 struct sockaddr_in *sin = (struct sockaddr_in *)&ifr.ifr_addr;
608 struct in_device *in_dev;
609 struct in_ifaddr **ifap = NULL;
610 struct in_ifaddr *ifa = NULL;
611 struct net_device *dev;
612 char *colon;
613 int ret = -EFAULT;
614 int tryaddrmatch = 0;
615
616 /*
617 * Fetch the caller's info block into kernel space
618 */
619
620 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
621 goto out;
622 ifr.ifr_name[IFNAMSIZ - 1] = 0;
623
624 /* save original address for comparison */
625 memcpy(&sin_orig, sin, sizeof(*sin));
626
627 colon = strchr(ifr.ifr_name, ':');
628 if (colon)
629 *colon = 0;
630
631#ifdef CONFIG_KMOD
632 dev_load(&init_net, ifr.ifr_name);
633#endif
634
635 switch (cmd) {
636 case SIOCGIFADDR: /* Get interface address */
637 case SIOCGIFBRDADDR: /* Get the broadcast address */
638 case SIOCGIFDSTADDR: /* Get the destination address */
639 case SIOCGIFNETMASK: /* Get the netmask for the interface */
640 /* Note that these ioctls will not sleep,
641 so that we do not impose a lock.
642 One day we will be forced to put shlock here (I mean SMP)
643 */
644 tryaddrmatch = (sin_orig.sin_family == AF_INET);
645 memset(sin, 0, sizeof(*sin));
646 sin->sin_family = AF_INET;
647 break;
648
649 case SIOCSIFFLAGS:
650 ret = -EACCES;
651 if (!capable(CAP_NET_ADMIN))
652 goto out;
653 break;
654 case SIOCSIFADDR: /* Set interface address (and family) */
655 case SIOCSIFBRDADDR: /* Set the broadcast address */
656 case SIOCSIFDSTADDR: /* Set the destination address */
657 case SIOCSIFNETMASK: /* Set the netmask for the interface */
658 ret = -EACCES;
659 if (!capable(CAP_NET_ADMIN))
660 goto out;
661 ret = -EINVAL;
662 if (sin->sin_family != AF_INET)
663 goto out;
664 break;
665 default:
666 ret = -EINVAL;
667 goto out;
668 }
669
670 rtnl_lock();
671
672 ret = -ENODEV;
673 if ((dev = __dev_get_by_name(&init_net, ifr.ifr_name)) == NULL)
674 goto done;
675
676 if (colon)
677 *colon = ':';
678
679 if ((in_dev = __in_dev_get_rtnl(dev)) != NULL) {
680 if (tryaddrmatch) {
681 /* Matthias Andree */
682 /* compare label and address (4.4BSD style) */
683 /* note: we only do this for a limited set of ioctls
684 and only if the original address family was AF_INET.
685 This is checked above. */
686 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
687 ifap = &ifa->ifa_next) {
688 if (!strcmp(ifr.ifr_name, ifa->ifa_label) &&
689 sin_orig.sin_addr.s_addr ==
690 ifa->ifa_address) {
691 break; /* found */
692 }
693 }
694 }
695 /* we didn't get a match, maybe the application is
696 4.3BSD-style and passed in junk so we fall back to
697 comparing just the label */
698 if (!ifa) {
699 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
700 ifap = &ifa->ifa_next)
701 if (!strcmp(ifr.ifr_name, ifa->ifa_label))
702 break;
703 }
704 }
705
706 ret = -EADDRNOTAVAIL;
707 if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS)
708 goto done;
709
710 switch (cmd) {
711 case SIOCGIFADDR: /* Get interface address */
712 sin->sin_addr.s_addr = ifa->ifa_local;
713 goto rarok;
714
715 case SIOCGIFBRDADDR: /* Get the broadcast address */
716 sin->sin_addr.s_addr = ifa->ifa_broadcast;
717 goto rarok;
718
719 case SIOCGIFDSTADDR: /* Get the destination address */
720 sin->sin_addr.s_addr = ifa->ifa_address;
721 goto rarok;
722
723 case SIOCGIFNETMASK: /* Get the netmask for the interface */
724 sin->sin_addr.s_addr = ifa->ifa_mask;
725 goto rarok;
726
727 case SIOCSIFFLAGS:
728 if (colon) {
729 ret = -EADDRNOTAVAIL;
730 if (!ifa)
731 break;
732 ret = 0;
733 if (!(ifr.ifr_flags & IFF_UP))
734 inet_del_ifa(in_dev, ifap, 1);
735 break;
736 }
737 ret = dev_change_flags(dev, ifr.ifr_flags);
738 break;
739
740 case SIOCSIFADDR: /* Set interface address (and family) */
741 ret = -EINVAL;
742 if (inet_abc_len(sin->sin_addr.s_addr) < 0)
743 break;
744
745 if (!ifa) {
746 ret = -ENOBUFS;
747 if ((ifa = inet_alloc_ifa()) == NULL)
748 break;
749 if (colon)
750 memcpy(ifa->ifa_label, ifr.ifr_name, IFNAMSIZ);
751 else
752 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
753 } else {
754 ret = 0;
755 if (ifa->ifa_local == sin->sin_addr.s_addr)
756 break;
757 inet_del_ifa(in_dev, ifap, 0);
758 ifa->ifa_broadcast = 0;
759 ifa->ifa_anycast = 0;
760 }
761
762 ifa->ifa_address = ifa->ifa_local = sin->sin_addr.s_addr;
763
764 if (!(dev->flags & IFF_POINTOPOINT)) {
765 ifa->ifa_prefixlen = inet_abc_len(ifa->ifa_address);
766 ifa->ifa_mask = inet_make_mask(ifa->ifa_prefixlen);
767 if ((dev->flags & IFF_BROADCAST) &&
768 ifa->ifa_prefixlen < 31)
769 ifa->ifa_broadcast = ifa->ifa_address |
770 ~ifa->ifa_mask;
771 } else {
772 ifa->ifa_prefixlen = 32;
773 ifa->ifa_mask = inet_make_mask(32);
774 }
775 ret = inet_set_ifa(dev, ifa);
776 break;
777
778 case SIOCSIFBRDADDR: /* Set the broadcast address */
779 ret = 0;
780 if (ifa->ifa_broadcast != sin->sin_addr.s_addr) {
781 inet_del_ifa(in_dev, ifap, 0);
782 ifa->ifa_broadcast = sin->sin_addr.s_addr;
783 inet_insert_ifa(ifa);
784 }
785 break;
786
787 case SIOCSIFDSTADDR: /* Set the destination address */
788 ret = 0;
789 if (ifa->ifa_address == sin->sin_addr.s_addr)
790 break;
791 ret = -EINVAL;
792 if (inet_abc_len(sin->sin_addr.s_addr) < 0)
793 break;
794 ret = 0;
795 inet_del_ifa(in_dev, ifap, 0);
796 ifa->ifa_address = sin->sin_addr.s_addr;
797 inet_insert_ifa(ifa);
798 break;
799
800 case SIOCSIFNETMASK: /* Set the netmask for the interface */
801
802 /*
803 * The mask we set must be legal.
804 */
805 ret = -EINVAL;
806 if (bad_mask(sin->sin_addr.s_addr, 0))
807 break;
808 ret = 0;
809 if (ifa->ifa_mask != sin->sin_addr.s_addr) {
810 __be32 old_mask = ifa->ifa_mask;
811 inet_del_ifa(in_dev, ifap, 0);
812 ifa->ifa_mask = sin->sin_addr.s_addr;
813 ifa->ifa_prefixlen = inet_mask_len(ifa->ifa_mask);
814
815 /* See if current broadcast address matches
816 * with current netmask, then recalculate
817 * the broadcast address. Otherwise it's a
818 * funny address, so don't touch it since
819 * the user seems to know what (s)he's doing...
820 */
821 if ((dev->flags & IFF_BROADCAST) &&
822 (ifa->ifa_prefixlen < 31) &&
823 (ifa->ifa_broadcast ==
824 (ifa->ifa_local|~old_mask))) {
825 ifa->ifa_broadcast = (ifa->ifa_local |
826 ~sin->sin_addr.s_addr);
827 }
828 inet_insert_ifa(ifa);
829 }
830 break;
831 }
832done:
833 rtnl_unlock();
834out:
835 return ret;
836rarok:
837 rtnl_unlock();
838 ret = copy_to_user(arg, &ifr, sizeof(struct ifreq)) ? -EFAULT : 0;
839 goto out;
840}
841
842static int inet_gifconf(struct net_device *dev, char __user *buf, int len)
843{
844 struct in_device *in_dev = __in_dev_get_rtnl(dev);
845 struct in_ifaddr *ifa;
846 struct ifreq ifr;
847 int done = 0;
848
849 if (!in_dev || (ifa = in_dev->ifa_list) == NULL)
850 goto out;
851
852 for (; ifa; ifa = ifa->ifa_next) {
853 if (!buf) {
854 done += sizeof(ifr);
855 continue;
856 }
857 if (len < (int) sizeof(ifr))
858 break;
859 memset(&ifr, 0, sizeof(struct ifreq));
860 if (ifa->ifa_label)
861 strcpy(ifr.ifr_name, ifa->ifa_label);
862 else
863 strcpy(ifr.ifr_name, dev->name);
864
865 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_family = AF_INET;
866 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_addr.s_addr =
867 ifa->ifa_local;
868
869 if (copy_to_user(buf, &ifr, sizeof(struct ifreq))) {
870 done = -EFAULT;
871 break;
872 }
873 buf += sizeof(struct ifreq);
874 len -= sizeof(struct ifreq);
875 done += sizeof(struct ifreq);
876 }
877out:
878 return done;
879}
880
881__be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope)
882{
883 __be32 addr = 0;
884 struct in_device *in_dev;
885
886 rcu_read_lock();
887 in_dev = __in_dev_get_rcu(dev);
888 if (!in_dev)
889 goto no_in_dev;
890
891 for_primary_ifa(in_dev) {
892 if (ifa->ifa_scope > scope)
893 continue;
894 if (!dst || inet_ifa_match(dst, ifa)) {
895 addr = ifa->ifa_local;
896 break;
897 }
898 if (!addr)
899 addr = ifa->ifa_local;
900 } endfor_ifa(in_dev);
901no_in_dev:
902 rcu_read_unlock();
903
904 if (addr)
905 goto out;
906
907 /* Not loopback addresses on loopback should be preferred
908 in this case. It is importnat that lo is the first interface
909 in dev_base list.
910 */
911 read_lock(&dev_base_lock);
912 rcu_read_lock();
913 for_each_netdev(&init_net, dev) {
914 if ((in_dev = __in_dev_get_rcu(dev)) == NULL)
915 continue;
916
917 for_primary_ifa(in_dev) {
918 if (ifa->ifa_scope != RT_SCOPE_LINK &&
919 ifa->ifa_scope <= scope) {
920 addr = ifa->ifa_local;
921 goto out_unlock_both;
922 }
923 } endfor_ifa(in_dev);
924 }
925out_unlock_both:
926 read_unlock(&dev_base_lock);
927 rcu_read_unlock();
928out:
929 return addr;
930}
931
932static __be32 confirm_addr_indev(struct in_device *in_dev, __be32 dst,
933 __be32 local, int scope)
934{
935 int same = 0;
936 __be32 addr = 0;
937
938 for_ifa(in_dev) {
939 if (!addr &&
940 (local == ifa->ifa_local || !local) &&
941 ifa->ifa_scope <= scope) {
942 addr = ifa->ifa_local;
943 if (same)
944 break;
945 }
946 if (!same) {
947 same = (!local || inet_ifa_match(local, ifa)) &&
948 (!dst || inet_ifa_match(dst, ifa));
949 if (same && addr) {
950 if (local || !dst)
951 break;
952 /* Is the selected addr into dst subnet? */
953 if (inet_ifa_match(addr, ifa))
954 break;
955 /* No, then can we use new local src? */
956 if (ifa->ifa_scope <= scope) {
957 addr = ifa->ifa_local;
958 break;
959 }
960 /* search for large dst subnet for addr */
961 same = 0;
962 }
963 }
964 } endfor_ifa(in_dev);
965
966 return same? addr : 0;
967}
968
969/*
970 * Confirm that local IP address exists using wildcards:
971 * - in_dev: only on this interface, 0=any interface
972 * - dst: only in the same subnet as dst, 0=any dst
973 * - local: address, 0=autoselect the local address
974 * - scope: maximum allowed scope value for the local address
975 */
976__be32 inet_confirm_addr(struct in_device *in_dev,
977 __be32 dst, __be32 local, int scope)
978{
979 __be32 addr = 0;
980 struct net_device *dev;
981
982 if (in_dev != NULL)
983 return confirm_addr_indev(in_dev, dst, local, scope);
984
985 read_lock(&dev_base_lock);
986 rcu_read_lock();
987 for_each_netdev(&init_net, dev) {
988 if ((in_dev = __in_dev_get_rcu(dev))) {
989 addr = confirm_addr_indev(in_dev, dst, local, scope);
990 if (addr)
991 break;
992 }
993 }
994 rcu_read_unlock();
995 read_unlock(&dev_base_lock);
996
997 return addr;
998}
999
1000/*
1001 * Device notifier
1002 */
1003
1004int register_inetaddr_notifier(struct notifier_block *nb)
1005{
1006 return blocking_notifier_chain_register(&inetaddr_chain, nb);
1007}
1008
1009int unregister_inetaddr_notifier(struct notifier_block *nb)
1010{
1011 return blocking_notifier_chain_unregister(&inetaddr_chain, nb);
1012}
1013
1014/* Rename ifa_labels for a device name change. Make some effort to preserve existing
1015 * alias numbering and to create unique labels if possible.
1016*/
1017static void inetdev_changename(struct net_device *dev, struct in_device *in_dev)
1018{
1019 struct in_ifaddr *ifa;
1020 int named = 0;
1021
1022 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1023 char old[IFNAMSIZ], *dot;
1024
1025 memcpy(old, ifa->ifa_label, IFNAMSIZ);
1026 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1027 if (named++ == 0)
1028 continue;
1029 dot = strchr(old, ':');
1030 if (dot == NULL) {
1031 sprintf(old, ":%d", named);
1032 dot = old;
1033 }
1034 if (strlen(dot) + strlen(dev->name) < IFNAMSIZ) {
1035 strcat(ifa->ifa_label, dot);
1036 } else {
1037 strcpy(ifa->ifa_label + (IFNAMSIZ - strlen(dot) - 1), dot);
1038 }
1039 }
1040}
1041
1042/* Called only under RTNL semaphore */
1043
1044static int inetdev_event(struct notifier_block *this, unsigned long event,
1045 void *ptr)
1046{
1047 struct net_device *dev = ptr;
1048 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1049
1050 if (dev->nd_net != &init_net)
1051 return NOTIFY_DONE;
1052
1053 ASSERT_RTNL();
1054
1055 if (!in_dev) {
1056 if (event == NETDEV_REGISTER) {
1057 in_dev = inetdev_init(dev);
1058 if (!in_dev)
1059 return notifier_from_errno(-ENOMEM);
1060 if (dev->flags & IFF_LOOPBACK) {
1061 IN_DEV_CONF_SET(in_dev, NOXFRM, 1);
1062 IN_DEV_CONF_SET(in_dev, NOPOLICY, 1);
1063 }
1064 }
1065 goto out;
1066 }
1067
1068 switch (event) {
1069 case NETDEV_REGISTER:
1070 printk(KERN_DEBUG "inetdev_event: bug\n");
1071 dev->ip_ptr = NULL;
1072 break;
1073 case NETDEV_UP:
1074 if (dev->mtu < 68)
1075 break;
1076 if (dev->flags & IFF_LOOPBACK) {
1077 struct in_ifaddr *ifa;
1078 if ((ifa = inet_alloc_ifa()) != NULL) {
1079 ifa->ifa_local =
1080 ifa->ifa_address = htonl(INADDR_LOOPBACK);
1081 ifa->ifa_prefixlen = 8;
1082 ifa->ifa_mask = inet_make_mask(8);
1083 in_dev_hold(in_dev);
1084 ifa->ifa_dev = in_dev;
1085 ifa->ifa_scope = RT_SCOPE_HOST;
1086 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1087 inet_insert_ifa(ifa);
1088 }
1089 }
1090 ip_mc_up(in_dev);
1091 break;
1092 case NETDEV_DOWN:
1093 ip_mc_down(in_dev);
1094 break;
1095 case NETDEV_CHANGEMTU:
1096 if (dev->mtu >= 68)
1097 break;
1098 /* MTU falled under 68, disable IP */
1099 case NETDEV_UNREGISTER:
1100 inetdev_destroy(in_dev);
1101 break;
1102 case NETDEV_CHANGENAME:
1103 /* Do not notify about label change, this event is
1104 * not interesting to applications using netlink.
1105 */
1106 inetdev_changename(dev, in_dev);
1107
1108 devinet_sysctl_unregister(in_dev);
1109 devinet_sysctl_register(in_dev);
1110 break;
1111 }
1112out:
1113 return NOTIFY_DONE;
1114}
1115
1116static struct notifier_block ip_netdev_notifier = {
1117 .notifier_call =inetdev_event,
1118};
1119
1120static inline size_t inet_nlmsg_size(void)
1121{
1122 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
1123 + nla_total_size(4) /* IFA_ADDRESS */
1124 + nla_total_size(4) /* IFA_LOCAL */
1125 + nla_total_size(4) /* IFA_BROADCAST */
1126 + nla_total_size(4) /* IFA_ANYCAST */
1127 + nla_total_size(IFNAMSIZ); /* IFA_LABEL */
1128}
1129
1130static int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa,
1131 u32 pid, u32 seq, int event, unsigned int flags)
1132{
1133 struct ifaddrmsg *ifm;
1134 struct nlmsghdr *nlh;
1135
1136 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*ifm), flags);
1137 if (nlh == NULL)
1138 return -EMSGSIZE;
1139
1140 ifm = nlmsg_data(nlh);
1141 ifm->ifa_family = AF_INET;
1142 ifm->ifa_prefixlen = ifa->ifa_prefixlen;
1143 ifm->ifa_flags = ifa->ifa_flags|IFA_F_PERMANENT;
1144 ifm->ifa_scope = ifa->ifa_scope;
1145 ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
1146
1147 if (ifa->ifa_address)
1148 NLA_PUT_BE32(skb, IFA_ADDRESS, ifa->ifa_address);
1149
1150 if (ifa->ifa_local)
1151 NLA_PUT_BE32(skb, IFA_LOCAL, ifa->ifa_local);
1152
1153 if (ifa->ifa_broadcast)
1154 NLA_PUT_BE32(skb, IFA_BROADCAST, ifa->ifa_broadcast);
1155
1156 if (ifa->ifa_anycast)
1157 NLA_PUT_BE32(skb, IFA_ANYCAST, ifa->ifa_anycast);
1158
1159 if (ifa->ifa_label[0])
1160 NLA_PUT_STRING(skb, IFA_LABEL, ifa->ifa_label);
1161
1162 return nlmsg_end(skb, nlh);
1163
1164nla_put_failure:
1165 nlmsg_cancel(skb, nlh);
1166 return -EMSGSIZE;
1167}
1168
1169static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
1170{
1171 struct net *net = skb->sk->sk_net;
1172 int idx, ip_idx;
1173 struct net_device *dev;
1174 struct in_device *in_dev;
1175 struct in_ifaddr *ifa;
1176 int s_ip_idx, s_idx = cb->args[0];
1177
1178 if (net != &init_net)
1179 return 0;
1180
1181 s_ip_idx = ip_idx = cb->args[1];
1182 idx = 0;
1183 for_each_netdev(&init_net, dev) {
1184 if (idx < s_idx)
1185 goto cont;
1186 if (idx > s_idx)
1187 s_ip_idx = 0;
1188 if ((in_dev = __in_dev_get_rtnl(dev)) == NULL)
1189 goto cont;
1190
1191 for (ifa = in_dev->ifa_list, ip_idx = 0; ifa;
1192 ifa = ifa->ifa_next, ip_idx++) {
1193 if (ip_idx < s_ip_idx)
1194 continue;
1195 if (inet_fill_ifaddr(skb, ifa, NETLINK_CB(cb->skb).pid,
1196 cb->nlh->nlmsg_seq,
1197 RTM_NEWADDR, NLM_F_MULTI) <= 0)
1198 goto done;
1199 }
1200cont:
1201 idx++;
1202 }
1203
1204done:
1205 cb->args[0] = idx;
1206 cb->args[1] = ip_idx;
1207
1208 return skb->len;
1209}
1210
1211static void rtmsg_ifa(int event, struct in_ifaddr* ifa, struct nlmsghdr *nlh,
1212 u32 pid)
1213{
1214 struct sk_buff *skb;
1215 u32 seq = nlh ? nlh->nlmsg_seq : 0;
1216 int err = -ENOBUFS;
1217
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, &init_net, pid, RTNLGRP_IPV4_IFADDR, nlh, GFP_KERNEL);
1230errout:
1231 if (err < 0)
1232 rtnl_set_sk_err(&init_net, RTNLGRP_IPV4_IFADDR, err);
1233}
1234
1235#ifdef CONFIG_SYSCTL
1236
1237static 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
1253static 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
1275static 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
1295static 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
1347static 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
1367int 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
1381int 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
1423static 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
1460static 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
1506free_procname:
1507 kfree(t->dev_name);
1508free:
1509 kfree(t);
1510out:
1511 return -ENOBUFS;
1512}
1513
1514static 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
1527static 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
1535static void devinet_sysctl_unregister(struct in_device *idev)
1536{
1537 __devinet_sysctl_unregister(&idev->cnf);
1538 neigh_sysctl_unregister(idev->arp_parms);
1539}
1540
1541static 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
1557static __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
1564static __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
1620err_reg_ctl:
1621 __devinet_sysctl_unregister(dflt);
1622err_reg_dflt:
1623 __devinet_sysctl_unregister(all);
1624err_reg_all:
1625 if (tbl != ctl_forward_entry)
1626 kfree(tbl);
1627err_alloc_ctl:
1628#endif
1629 if (dflt != &ipv4_devconf_dflt)
1630 kfree(dflt);
1631err_alloc_dflt:
1632 if (all != &ipv4_devconf)
1633 kfree(all);
1634err_alloc_all:
1635 return err;
1636}
1637
1638static __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
1653static __net_initdata struct pernet_operations devinet_ops = {
1654 .init = devinet_init_net,
1655 .exit = devinet_exit_net,
1656};
1657
1658void __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
1670EXPORT_SYMBOL(in_dev_finish_destroy);
1671EXPORT_SYMBOL(inet_select_addr);
1672EXPORT_SYMBOL(inetdev_by_index);
1673EXPORT_SYMBOL(register_inetaddr_notifier);
1674EXPORT_SYMBOL(unregister_inetaddr_notifier);
Linux kernel - Deliverables
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