net: add ARP notify option for devices
[linux-2.6.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 <asm/system.h>
31 #include <linux/bitops.h>
32 #include <linux/capability.h>
33 #include <linux/module.h>
34 #include <linux/types.h>
35 #include <linux/kernel.h>
36 #include <linux/string.h>
37 #include <linux/mm.h>
38 #include <linux/socket.h>
39 #include <linux/sockios.h>
40 #include <linux/in.h>
41 #include <linux/errno.h>
42 #include <linux/interrupt.h>
43 #include <linux/if_addr.h>
44 #include <linux/if_ether.h>
45 #include <linux/inet.h>
46 #include <linux/netdevice.h>
47 #include <linux/etherdevice.h>
48 #include <linux/skbuff.h>
49 #include <linux/init.h>
50 #include <linux/notifier.h>
51 #include <linux/inetdevice.h>
52 #include <linux/igmp.h>
53 #ifdef CONFIG_SYSCTL
54 #include <linux/sysctl.h>
55 #endif
56 #include <linux/kmod.h>
57
58 #include <net/arp.h>
59 #include <net/ip.h>
60 #include <net/route.h>
61 #include <net/ip_fib.h>
62 #include <net/rtnetlink.h>
63 #include <net/net_namespace.h>
64
65 static struct ipv4_devconf ipv4_devconf = {
66         .data = {
67                 [NET_IPV4_CONF_ACCEPT_REDIRECTS - 1] = 1,
68                 [NET_IPV4_CONF_SEND_REDIRECTS - 1] = 1,
69                 [NET_IPV4_CONF_SECURE_REDIRECTS - 1] = 1,
70                 [NET_IPV4_CONF_SHARED_MEDIA - 1] = 1,
71         },
72 };
73
74 static struct ipv4_devconf ipv4_devconf_dflt = {
75         .data = {
76                 [NET_IPV4_CONF_ACCEPT_REDIRECTS - 1] = 1,
77                 [NET_IPV4_CONF_SEND_REDIRECTS - 1] = 1,
78                 [NET_IPV4_CONF_SECURE_REDIRECTS - 1] = 1,
79                 [NET_IPV4_CONF_SHARED_MEDIA - 1] = 1,
80                 [NET_IPV4_CONF_ACCEPT_SOURCE_ROUTE - 1] = 1,
81         },
82 };
83
84 #define IPV4_DEVCONF_DFLT(net, attr) \
85         IPV4_DEVCONF((*net->ipv4.devconf_dflt), attr)
86
87 static const struct nla_policy ifa_ipv4_policy[IFA_MAX+1] = {
88         [IFA_LOCAL]             = { .type = NLA_U32 },
89         [IFA_ADDRESS]           = { .type = NLA_U32 },
90         [IFA_BROADCAST]         = { .type = NLA_U32 },
91         [IFA_LABEL]             = { .type = NLA_STRING, .len = IFNAMSIZ - 1 },
92 };
93
94 static void rtmsg_ifa(int event, struct in_ifaddr *, struct nlmsghdr *, u32);
95
96 static BLOCKING_NOTIFIER_HEAD(inetaddr_chain);
97 static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
98                          int destroy);
99 #ifdef CONFIG_SYSCTL
100 static void devinet_sysctl_register(struct in_device *idev);
101 static void devinet_sysctl_unregister(struct in_device *idev);
102 #else
103 static inline void devinet_sysctl_register(struct in_device *idev)
104 {
105 }
106 static inline void devinet_sysctl_unregister(struct in_device *idev)
107 {
108 }
109 #endif
110
111 /* Locks all the inet devices. */
112
113 static struct in_ifaddr *inet_alloc_ifa(void)
114 {
115         return kzalloc(sizeof(struct in_ifaddr), GFP_KERNEL);
116 }
117
118 static void inet_rcu_free_ifa(struct rcu_head *head)
119 {
120         struct in_ifaddr *ifa = container_of(head, struct in_ifaddr, rcu_head);
121         if (ifa->ifa_dev)
122                 in_dev_put(ifa->ifa_dev);
123         kfree(ifa);
124 }
125
126 static inline void inet_free_ifa(struct in_ifaddr *ifa)
127 {
128         call_rcu(&ifa->rcu_head, inet_rcu_free_ifa);
129 }
130
131 void in_dev_finish_destroy(struct in_device *idev)
132 {
133         struct net_device *dev = idev->dev;
134
135         WARN_ON(idev->ifa_list);
136         WARN_ON(idev->mc_list);
137 #ifdef NET_REFCNT_DEBUG
138         printk(KERN_DEBUG "in_dev_finish_destroy: %p=%s\n",
139                idev, dev ? dev->name : "NIL");
140 #endif
141         dev_put(dev);
142         if (!idev->dead)
143                 printk("Freeing alive in_device %p\n", idev);
144         else {
145                 kfree(idev);
146         }
147 }
148
149 static struct in_device *inetdev_init(struct net_device *dev)
150 {
151         struct in_device *in_dev;
152
153         ASSERT_RTNL();
154
155         in_dev = kzalloc(sizeof(*in_dev), GFP_KERNEL);
156         if (!in_dev)
157                 goto out;
158         memcpy(&in_dev->cnf, dev_net(dev)->ipv4.devconf_dflt,
159                         sizeof(in_dev->cnf));
160         in_dev->cnf.sysctl = NULL;
161         in_dev->dev = dev;
162         if ((in_dev->arp_parms = neigh_parms_alloc(dev, &arp_tbl)) == NULL)
163                 goto out_kfree;
164         if (IPV4_DEVCONF(in_dev->cnf, FORWARDING))
165                 dev_disable_lro(dev);
166         /* Reference in_dev->dev */
167         dev_hold(dev);
168         /* Account for reference dev->ip_ptr (below) */
169         in_dev_hold(in_dev);
170
171         devinet_sysctl_register(in_dev);
172         ip_mc_init_dev(in_dev);
173         if (dev->flags & IFF_UP)
174                 ip_mc_up(in_dev);
175
176         /* we can receive as soon as ip_ptr is set -- do this last */
177         rcu_assign_pointer(dev->ip_ptr, in_dev);
178 out:
179         return in_dev;
180 out_kfree:
181         kfree(in_dev);
182         in_dev = NULL;
183         goto out;
184 }
185
186 static void in_dev_rcu_put(struct rcu_head *head)
187 {
188         struct in_device *idev = container_of(head, struct in_device, rcu_head);
189         in_dev_put(idev);
190 }
191
192 static void inetdev_destroy(struct in_device *in_dev)
193 {
194         struct in_ifaddr *ifa;
195         struct net_device *dev;
196
197         ASSERT_RTNL();
198
199         dev = in_dev->dev;
200
201         in_dev->dead = 1;
202
203         ip_mc_destroy_dev(in_dev);
204
205         while ((ifa = in_dev->ifa_list) != NULL) {
206                 inet_del_ifa(in_dev, &in_dev->ifa_list, 0);
207                 inet_free_ifa(ifa);
208         }
209
210         dev->ip_ptr = NULL;
211
212         devinet_sysctl_unregister(in_dev);
213         neigh_parms_release(&arp_tbl, in_dev->arp_parms);
214         arp_ifdown(dev);
215
216         call_rcu(&in_dev->rcu_head, in_dev_rcu_put);
217 }
218
219 int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b)
220 {
221         rcu_read_lock();
222         for_primary_ifa(in_dev) {
223                 if (inet_ifa_match(a, ifa)) {
224                         if (!b || inet_ifa_match(b, ifa)) {
225                                 rcu_read_unlock();
226                                 return 1;
227                         }
228                 }
229         } endfor_ifa(in_dev);
230         rcu_read_unlock();
231         return 0;
232 }
233
234 static void __inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
235                          int destroy, struct nlmsghdr *nlh, u32 pid)
236 {
237         struct in_ifaddr *promote = NULL;
238         struct in_ifaddr *ifa, *ifa1 = *ifap;
239         struct in_ifaddr *last_prim = in_dev->ifa_list;
240         struct in_ifaddr *prev_prom = NULL;
241         int do_promote = IN_DEV_PROMOTE_SECONDARIES(in_dev);
242
243         ASSERT_RTNL();
244
245         /* 1. Deleting primary ifaddr forces deletion all secondaries
246          * unless alias promotion is set
247          **/
248
249         if (!(ifa1->ifa_flags & IFA_F_SECONDARY)) {
250                 struct in_ifaddr **ifap1 = &ifa1->ifa_next;
251
252                 while ((ifa = *ifap1) != NULL) {
253                         if (!(ifa->ifa_flags & IFA_F_SECONDARY) &&
254                             ifa1->ifa_scope <= ifa->ifa_scope)
255                                 last_prim = ifa;
256
257                         if (!(ifa->ifa_flags & IFA_F_SECONDARY) ||
258                             ifa1->ifa_mask != ifa->ifa_mask ||
259                             !inet_ifa_match(ifa1->ifa_address, ifa)) {
260                                 ifap1 = &ifa->ifa_next;
261                                 prev_prom = ifa;
262                                 continue;
263                         }
264
265                         if (!do_promote) {
266                                 *ifap1 = ifa->ifa_next;
267
268                                 rtmsg_ifa(RTM_DELADDR, ifa, nlh, pid);
269                                 blocking_notifier_call_chain(&inetaddr_chain,
270                                                 NETDEV_DOWN, ifa);
271                                 inet_free_ifa(ifa);
272                         } else {
273                                 promote = ifa;
274                                 break;
275                         }
276                 }
277         }
278
279         /* 2. Unlink it */
280
281         *ifap = ifa1->ifa_next;
282
283         /* 3. Announce address deletion */
284
285         /* Send message first, then call notifier.
286            At first sight, FIB update triggered by notifier
287            will refer to already deleted ifaddr, that could confuse
288            netlink listeners. It is not true: look, gated sees
289            that route deleted and if it still thinks that ifaddr
290            is valid, it will try to restore deleted routes... Grr.
291            So that, this order is correct.
292          */
293         rtmsg_ifa(RTM_DELADDR, ifa1, nlh, pid);
294         blocking_notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa1);
295
296         if (promote) {
297
298                 if (prev_prom) {
299                         prev_prom->ifa_next = promote->ifa_next;
300                         promote->ifa_next = last_prim->ifa_next;
301                         last_prim->ifa_next = promote;
302                 }
303
304                 promote->ifa_flags &= ~IFA_F_SECONDARY;
305                 rtmsg_ifa(RTM_NEWADDR, promote, nlh, pid);
306                 blocking_notifier_call_chain(&inetaddr_chain,
307                                 NETDEV_UP, promote);
308                 for (ifa = promote->ifa_next; ifa; ifa = ifa->ifa_next) {
309                         if (ifa1->ifa_mask != ifa->ifa_mask ||
310                             !inet_ifa_match(ifa1->ifa_address, ifa))
311                                         continue;
312                         fib_add_ifaddr(ifa);
313                 }
314
315         }
316         if (destroy)
317                 inet_free_ifa(ifa1);
318 }
319
320 static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
321                          int destroy)
322 {
323         __inet_del_ifa(in_dev, ifap, destroy, NULL, 0);
324 }
325
326 static int __inet_insert_ifa(struct in_ifaddr *ifa, struct nlmsghdr *nlh,
327                              u32 pid)
328 {
329         struct in_device *in_dev = ifa->ifa_dev;
330         struct in_ifaddr *ifa1, **ifap, **last_primary;
331
332         ASSERT_RTNL();
333
334         if (!ifa->ifa_local) {
335                 inet_free_ifa(ifa);
336                 return 0;
337         }
338
339         ifa->ifa_flags &= ~IFA_F_SECONDARY;
340         last_primary = &in_dev->ifa_list;
341
342         for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL;
343              ifap = &ifa1->ifa_next) {
344                 if (!(ifa1->ifa_flags & IFA_F_SECONDARY) &&
345                     ifa->ifa_scope <= ifa1->ifa_scope)
346                         last_primary = &ifa1->ifa_next;
347                 if (ifa1->ifa_mask == ifa->ifa_mask &&
348                     inet_ifa_match(ifa1->ifa_address, ifa)) {
349                         if (ifa1->ifa_local == ifa->ifa_local) {
350                                 inet_free_ifa(ifa);
351                                 return -EEXIST;
352                         }
353                         if (ifa1->ifa_scope != ifa->ifa_scope) {
354                                 inet_free_ifa(ifa);
355                                 return -EINVAL;
356                         }
357                         ifa->ifa_flags |= IFA_F_SECONDARY;
358                 }
359         }
360
361         if (!(ifa->ifa_flags & IFA_F_SECONDARY)) {
362                 net_srandom(ifa->ifa_local);
363                 ifap = last_primary;
364         }
365
366         ifa->ifa_next = *ifap;
367         *ifap = ifa;
368
369         /* Send message first, then call notifier.
370            Notifier will trigger FIB update, so that
371            listeners of netlink will know about new ifaddr */
372         rtmsg_ifa(RTM_NEWADDR, ifa, nlh, pid);
373         blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa);
374
375         return 0;
376 }
377
378 static int inet_insert_ifa(struct in_ifaddr *ifa)
379 {
380         return __inet_insert_ifa(ifa, NULL, 0);
381 }
382
383 static int inet_set_ifa(struct net_device *dev, struct in_ifaddr *ifa)
384 {
385         struct in_device *in_dev = __in_dev_get_rtnl(dev);
386
387         ASSERT_RTNL();
388
389         if (!in_dev) {
390                 inet_free_ifa(ifa);
391                 return -ENOBUFS;
392         }
393         ipv4_devconf_setall(in_dev);
394         if (ifa->ifa_dev != in_dev) {
395                 WARN_ON(ifa->ifa_dev);
396                 in_dev_hold(in_dev);
397                 ifa->ifa_dev = in_dev;
398         }
399         if (ipv4_is_loopback(ifa->ifa_local))
400                 ifa->ifa_scope = RT_SCOPE_HOST;
401         return inet_insert_ifa(ifa);
402 }
403
404 struct in_device *inetdev_by_index(struct net *net, int ifindex)
405 {
406         struct net_device *dev;
407         struct in_device *in_dev = NULL;
408         read_lock(&dev_base_lock);
409         dev = __dev_get_by_index(net, ifindex);
410         if (dev)
411                 in_dev = in_dev_get(dev);
412         read_unlock(&dev_base_lock);
413         return in_dev;
414 }
415
416 /* Called only from RTNL semaphored context. No locks. */
417
418 struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix,
419                                     __be32 mask)
420 {
421         ASSERT_RTNL();
422
423         for_primary_ifa(in_dev) {
424                 if (ifa->ifa_mask == mask && inet_ifa_match(prefix, ifa))
425                         return ifa;
426         } endfor_ifa(in_dev);
427         return NULL;
428 }
429
430 static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
431 {
432         struct net *net = sock_net(skb->sk);
433         struct nlattr *tb[IFA_MAX+1];
434         struct in_device *in_dev;
435         struct ifaddrmsg *ifm;
436         struct in_ifaddr *ifa, **ifap;
437         int err = -EINVAL;
438
439         ASSERT_RTNL();
440
441         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy);
442         if (err < 0)
443                 goto errout;
444
445         ifm = nlmsg_data(nlh);
446         in_dev = inetdev_by_index(net, ifm->ifa_index);
447         if (in_dev == NULL) {
448                 err = -ENODEV;
449                 goto errout;
450         }
451
452         __in_dev_put(in_dev);
453
454         for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
455              ifap = &ifa->ifa_next) {
456                 if (tb[IFA_LOCAL] &&
457                     ifa->ifa_local != nla_get_be32(tb[IFA_LOCAL]))
458                         continue;
459
460                 if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label))
461                         continue;
462
463                 if (tb[IFA_ADDRESS] &&
464                     (ifm->ifa_prefixlen != ifa->ifa_prefixlen ||
465                     !inet_ifa_match(nla_get_be32(tb[IFA_ADDRESS]), ifa)))
466                         continue;
467
468                 __inet_del_ifa(in_dev, ifap, 1, nlh, NETLINK_CB(skb).pid);
469                 return 0;
470         }
471
472         err = -EADDRNOTAVAIL;
473 errout:
474         return err;
475 }
476
477 static struct in_ifaddr *rtm_to_ifaddr(struct net *net, struct nlmsghdr *nlh)
478 {
479         struct nlattr *tb[IFA_MAX+1];
480         struct in_ifaddr *ifa;
481         struct ifaddrmsg *ifm;
482         struct net_device *dev;
483         struct in_device *in_dev;
484         int err;
485
486         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy);
487         if (err < 0)
488                 goto errout;
489
490         ifm = nlmsg_data(nlh);
491         err = -EINVAL;
492         if (ifm->ifa_prefixlen > 32 || tb[IFA_LOCAL] == NULL)
493                 goto errout;
494
495         dev = __dev_get_by_index(net, ifm->ifa_index);
496         err = -ENODEV;
497         if (dev == NULL)
498                 goto errout;
499
500         in_dev = __in_dev_get_rtnl(dev);
501         err = -ENOBUFS;
502         if (in_dev == NULL)
503                 goto errout;
504
505         ifa = inet_alloc_ifa();
506         if (ifa == NULL)
507                 /*
508                  * A potential indev allocation can be left alive, it stays
509                  * assigned to its device and is destroy with it.
510                  */
511                 goto errout;
512
513         ipv4_devconf_setall(in_dev);
514         in_dev_hold(in_dev);
515
516         if (tb[IFA_ADDRESS] == NULL)
517                 tb[IFA_ADDRESS] = tb[IFA_LOCAL];
518
519         ifa->ifa_prefixlen = ifm->ifa_prefixlen;
520         ifa->ifa_mask = inet_make_mask(ifm->ifa_prefixlen);
521         ifa->ifa_flags = ifm->ifa_flags;
522         ifa->ifa_scope = ifm->ifa_scope;
523         ifa->ifa_dev = in_dev;
524
525         ifa->ifa_local = nla_get_be32(tb[IFA_LOCAL]);
526         ifa->ifa_address = nla_get_be32(tb[IFA_ADDRESS]);
527
528         if (tb[IFA_BROADCAST])
529                 ifa->ifa_broadcast = nla_get_be32(tb[IFA_BROADCAST]);
530
531         if (tb[IFA_LABEL])
532                 nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ);
533         else
534                 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
535
536         return ifa;
537
538 errout:
539         return ERR_PTR(err);
540 }
541
542 static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
543 {
544         struct net *net = sock_net(skb->sk);
545         struct in_ifaddr *ifa;
546
547         ASSERT_RTNL();
548
549         ifa = rtm_to_ifaddr(net, nlh);
550         if (IS_ERR(ifa))
551                 return PTR_ERR(ifa);
552
553         return __inet_insert_ifa(ifa, nlh, NETLINK_CB(skb).pid);
554 }
555
556 /*
557  *      Determine a default network mask, based on the IP address.
558  */
559
560 static __inline__ int inet_abc_len(__be32 addr)
561 {
562         int rc = -1;    /* Something else, probably a multicast. */
563
564         if (ipv4_is_zeronet(addr))
565                 rc = 0;
566         else {
567                 __u32 haddr = ntohl(addr);
568
569                 if (IN_CLASSA(haddr))
570                         rc = 8;
571                 else if (IN_CLASSB(haddr))
572                         rc = 16;
573                 else if (IN_CLASSC(haddr))
574                         rc = 24;
575         }
576
577         return rc;
578 }
579
580
581 int devinet_ioctl(struct net *net, unsigned int cmd, void __user *arg)
582 {
583         struct ifreq ifr;
584         struct sockaddr_in sin_orig;
585         struct sockaddr_in *sin = (struct sockaddr_in *)&ifr.ifr_addr;
586         struct in_device *in_dev;
587         struct in_ifaddr **ifap = NULL;
588         struct in_ifaddr *ifa = NULL;
589         struct net_device *dev;
590         char *colon;
591         int ret = -EFAULT;
592         int tryaddrmatch = 0;
593
594         /*
595          *      Fetch the caller's info block into kernel space
596          */
597
598         if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
599                 goto out;
600         ifr.ifr_name[IFNAMSIZ - 1] = 0;
601
602         /* save original address for comparison */
603         memcpy(&sin_orig, sin, sizeof(*sin));
604
605         colon = strchr(ifr.ifr_name, ':');
606         if (colon)
607                 *colon = 0;
608
609         dev_load(net, ifr.ifr_name);
610
611         switch (cmd) {
612         case SIOCGIFADDR:       /* Get interface address */
613         case SIOCGIFBRDADDR:    /* Get the broadcast address */
614         case SIOCGIFDSTADDR:    /* Get the destination address */
615         case SIOCGIFNETMASK:    /* Get the netmask for the interface */
616                 /* Note that these ioctls will not sleep,
617                    so that we do not impose a lock.
618                    One day we will be forced to put shlock here (I mean SMP)
619                  */
620                 tryaddrmatch = (sin_orig.sin_family == AF_INET);
621                 memset(sin, 0, sizeof(*sin));
622                 sin->sin_family = AF_INET;
623                 break;
624
625         case SIOCSIFFLAGS:
626                 ret = -EACCES;
627                 if (!capable(CAP_NET_ADMIN))
628                         goto out;
629                 break;
630         case SIOCSIFADDR:       /* Set interface address (and family) */
631         case SIOCSIFBRDADDR:    /* Set the broadcast address */
632         case SIOCSIFDSTADDR:    /* Set the destination address */
633         case SIOCSIFNETMASK:    /* Set the netmask for the interface */
634                 ret = -EACCES;
635                 if (!capable(CAP_NET_ADMIN))
636                         goto out;
637                 ret = -EINVAL;
638                 if (sin->sin_family != AF_INET)
639                         goto out;
640                 break;
641         default:
642                 ret = -EINVAL;
643                 goto out;
644         }
645
646         rtnl_lock();
647
648         ret = -ENODEV;
649         if ((dev = __dev_get_by_name(net, ifr.ifr_name)) == NULL)
650                 goto done;
651
652         if (colon)
653                 *colon = ':';
654
655         if ((in_dev = __in_dev_get_rtnl(dev)) != NULL) {
656                 if (tryaddrmatch) {
657                         /* Matthias Andree */
658                         /* compare label and address (4.4BSD style) */
659                         /* note: we only do this for a limited set of ioctls
660                            and only if the original address family was AF_INET.
661                            This is checked above. */
662                         for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
663                              ifap = &ifa->ifa_next) {
664                                 if (!strcmp(ifr.ifr_name, ifa->ifa_label) &&
665                                     sin_orig.sin_addr.s_addr ==
666                                                         ifa->ifa_address) {
667                                         break; /* found */
668                                 }
669                         }
670                 }
671                 /* we didn't get a match, maybe the application is
672                    4.3BSD-style and passed in junk so we fall back to
673                    comparing just the label */
674                 if (!ifa) {
675                         for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
676                              ifap = &ifa->ifa_next)
677                                 if (!strcmp(ifr.ifr_name, ifa->ifa_label))
678                                         break;
679                 }
680         }
681
682         ret = -EADDRNOTAVAIL;
683         if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS)
684                 goto done;
685
686         switch (cmd) {
687         case SIOCGIFADDR:       /* Get interface address */
688                 sin->sin_addr.s_addr = ifa->ifa_local;
689                 goto rarok;
690
691         case SIOCGIFBRDADDR:    /* Get the broadcast address */
692                 sin->sin_addr.s_addr = ifa->ifa_broadcast;
693                 goto rarok;
694
695         case SIOCGIFDSTADDR:    /* Get the destination address */
696                 sin->sin_addr.s_addr = ifa->ifa_address;
697                 goto rarok;
698
699         case SIOCGIFNETMASK:    /* Get the netmask for the interface */
700                 sin->sin_addr.s_addr = ifa->ifa_mask;
701                 goto rarok;
702
703         case SIOCSIFFLAGS:
704                 if (colon) {
705                         ret = -EADDRNOTAVAIL;
706                         if (!ifa)
707                                 break;
708                         ret = 0;
709                         if (!(ifr.ifr_flags & IFF_UP))
710                                 inet_del_ifa(in_dev, ifap, 1);
711                         break;
712                 }
713                 ret = dev_change_flags(dev, ifr.ifr_flags);
714                 break;
715
716         case SIOCSIFADDR:       /* Set interface address (and family) */
717                 ret = -EINVAL;
718                 if (inet_abc_len(sin->sin_addr.s_addr) < 0)
719                         break;
720
721                 if (!ifa) {
722                         ret = -ENOBUFS;
723                         if ((ifa = inet_alloc_ifa()) == NULL)
724                                 break;
725                         if (colon)
726                                 memcpy(ifa->ifa_label, ifr.ifr_name, IFNAMSIZ);
727                         else
728                                 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
729                 } else {
730                         ret = 0;
731                         if (ifa->ifa_local == sin->sin_addr.s_addr)
732                                 break;
733                         inet_del_ifa(in_dev, ifap, 0);
734                         ifa->ifa_broadcast = 0;
735                         ifa->ifa_scope = 0;
736                 }
737
738                 ifa->ifa_address = ifa->ifa_local = sin->sin_addr.s_addr;
739
740                 if (!(dev->flags & IFF_POINTOPOINT)) {
741                         ifa->ifa_prefixlen = inet_abc_len(ifa->ifa_address);
742                         ifa->ifa_mask = inet_make_mask(ifa->ifa_prefixlen);
743                         if ((dev->flags & IFF_BROADCAST) &&
744                             ifa->ifa_prefixlen < 31)
745                                 ifa->ifa_broadcast = ifa->ifa_address |
746                                                      ~ifa->ifa_mask;
747                 } else {
748                         ifa->ifa_prefixlen = 32;
749                         ifa->ifa_mask = inet_make_mask(32);
750                 }
751                 ret = inet_set_ifa(dev, ifa);
752                 break;
753
754         case SIOCSIFBRDADDR:    /* Set the broadcast address */
755                 ret = 0;
756                 if (ifa->ifa_broadcast != sin->sin_addr.s_addr) {
757                         inet_del_ifa(in_dev, ifap, 0);
758                         ifa->ifa_broadcast = sin->sin_addr.s_addr;
759                         inet_insert_ifa(ifa);
760                 }
761                 break;
762
763         case SIOCSIFDSTADDR:    /* Set the destination address */
764                 ret = 0;
765                 if (ifa->ifa_address == sin->sin_addr.s_addr)
766                         break;
767                 ret = -EINVAL;
768                 if (inet_abc_len(sin->sin_addr.s_addr) < 0)
769                         break;
770                 ret = 0;
771                 inet_del_ifa(in_dev, ifap, 0);
772                 ifa->ifa_address = sin->sin_addr.s_addr;
773                 inet_insert_ifa(ifa);
774                 break;
775
776         case SIOCSIFNETMASK:    /* Set the netmask for the interface */
777
778                 /*
779                  *      The mask we set must be legal.
780                  */
781                 ret = -EINVAL;
782                 if (bad_mask(sin->sin_addr.s_addr, 0))
783                         break;
784                 ret = 0;
785                 if (ifa->ifa_mask != sin->sin_addr.s_addr) {
786                         __be32 old_mask = ifa->ifa_mask;
787                         inet_del_ifa(in_dev, ifap, 0);
788                         ifa->ifa_mask = sin->sin_addr.s_addr;
789                         ifa->ifa_prefixlen = inet_mask_len(ifa->ifa_mask);
790
791                         /* See if current broadcast address matches
792                          * with current netmask, then recalculate
793                          * the broadcast address. Otherwise it's a
794                          * funny address, so don't touch it since
795                          * the user seems to know what (s)he's doing...
796                          */
797                         if ((dev->flags & IFF_BROADCAST) &&
798                             (ifa->ifa_prefixlen < 31) &&
799                             (ifa->ifa_broadcast ==
800                              (ifa->ifa_local|~old_mask))) {
801                                 ifa->ifa_broadcast = (ifa->ifa_local |
802                                                       ~sin->sin_addr.s_addr);
803                         }
804                         inet_insert_ifa(ifa);
805                 }
806                 break;
807         }
808 done:
809         rtnl_unlock();
810 out:
811         return ret;
812 rarok:
813         rtnl_unlock();
814         ret = copy_to_user(arg, &ifr, sizeof(struct ifreq)) ? -EFAULT : 0;
815         goto out;
816 }
817
818 static int inet_gifconf(struct net_device *dev, char __user *buf, int len)
819 {
820         struct in_device *in_dev = __in_dev_get_rtnl(dev);
821         struct in_ifaddr *ifa;
822         struct ifreq ifr;
823         int done = 0;
824
825         if (!in_dev || (ifa = in_dev->ifa_list) == NULL)
826                 goto out;
827
828         for (; ifa; ifa = ifa->ifa_next) {
829                 if (!buf) {
830                         done += sizeof(ifr);
831                         continue;
832                 }
833                 if (len < (int) sizeof(ifr))
834                         break;
835                 memset(&ifr, 0, sizeof(struct ifreq));
836                 if (ifa->ifa_label)
837                         strcpy(ifr.ifr_name, ifa->ifa_label);
838                 else
839                         strcpy(ifr.ifr_name, dev->name);
840
841                 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_family = AF_INET;
842                 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_addr.s_addr =
843                                                                 ifa->ifa_local;
844
845                 if (copy_to_user(buf, &ifr, sizeof(struct ifreq))) {
846                         done = -EFAULT;
847                         break;
848                 }
849                 buf  += sizeof(struct ifreq);
850                 len  -= sizeof(struct ifreq);
851                 done += sizeof(struct ifreq);
852         }
853 out:
854         return done;
855 }
856
857 __be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope)
858 {
859         __be32 addr = 0;
860         struct in_device *in_dev;
861         struct net *net = dev_net(dev);
862
863         rcu_read_lock();
864         in_dev = __in_dev_get_rcu(dev);
865         if (!in_dev)
866                 goto no_in_dev;
867
868         for_primary_ifa(in_dev) {
869                 if (ifa->ifa_scope > scope)
870                         continue;
871                 if (!dst || inet_ifa_match(dst, ifa)) {
872                         addr = ifa->ifa_local;
873                         break;
874                 }
875                 if (!addr)
876                         addr = ifa->ifa_local;
877         } endfor_ifa(in_dev);
878 no_in_dev:
879         rcu_read_unlock();
880
881         if (addr)
882                 goto out;
883
884         /* Not loopback addresses on loopback should be preferred
885            in this case. It is importnat that lo is the first interface
886            in dev_base list.
887          */
888         read_lock(&dev_base_lock);
889         rcu_read_lock();
890         for_each_netdev(net, dev) {
891                 if ((in_dev = __in_dev_get_rcu(dev)) == NULL)
892                         continue;
893
894                 for_primary_ifa(in_dev) {
895                         if (ifa->ifa_scope != RT_SCOPE_LINK &&
896                             ifa->ifa_scope <= scope) {
897                                 addr = ifa->ifa_local;
898                                 goto out_unlock_both;
899                         }
900                 } endfor_ifa(in_dev);
901         }
902 out_unlock_both:
903         read_unlock(&dev_base_lock);
904         rcu_read_unlock();
905 out:
906         return addr;
907 }
908
909 static __be32 confirm_addr_indev(struct in_device *in_dev, __be32 dst,
910                               __be32 local, int scope)
911 {
912         int same = 0;
913         __be32 addr = 0;
914
915         for_ifa(in_dev) {
916                 if (!addr &&
917                     (local == ifa->ifa_local || !local) &&
918                     ifa->ifa_scope <= scope) {
919                         addr = ifa->ifa_local;
920                         if (same)
921                                 break;
922                 }
923                 if (!same) {
924                         same = (!local || inet_ifa_match(local, ifa)) &&
925                                 (!dst || inet_ifa_match(dst, ifa));
926                         if (same && addr) {
927                                 if (local || !dst)
928                                         break;
929                                 /* Is the selected addr into dst subnet? */
930                                 if (inet_ifa_match(addr, ifa))
931                                         break;
932                                 /* No, then can we use new local src? */
933                                 if (ifa->ifa_scope <= scope) {
934                                         addr = ifa->ifa_local;
935                                         break;
936                                 }
937                                 /* search for large dst subnet for addr */
938                                 same = 0;
939                         }
940                 }
941         } endfor_ifa(in_dev);
942
943         return same? addr : 0;
944 }
945
946 /*
947  * Confirm that local IP address exists using wildcards:
948  * - in_dev: only on this interface, 0=any interface
949  * - dst: only in the same subnet as dst, 0=any dst
950  * - local: address, 0=autoselect the local address
951  * - scope: maximum allowed scope value for the local address
952  */
953 __be32 inet_confirm_addr(struct in_device *in_dev,
954                          __be32 dst, __be32 local, int scope)
955 {
956         __be32 addr = 0;
957         struct net_device *dev;
958         struct net *net;
959
960         if (scope != RT_SCOPE_LINK)
961                 return confirm_addr_indev(in_dev, dst, local, scope);
962
963         net = dev_net(in_dev->dev);
964         read_lock(&dev_base_lock);
965         rcu_read_lock();
966         for_each_netdev(net, dev) {
967                 if ((in_dev = __in_dev_get_rcu(dev))) {
968                         addr = confirm_addr_indev(in_dev, dst, local, scope);
969                         if (addr)
970                                 break;
971                 }
972         }
973         rcu_read_unlock();
974         read_unlock(&dev_base_lock);
975
976         return addr;
977 }
978
979 /*
980  *      Device notifier
981  */
982
983 int register_inetaddr_notifier(struct notifier_block *nb)
984 {
985         return blocking_notifier_chain_register(&inetaddr_chain, nb);
986 }
987
988 int unregister_inetaddr_notifier(struct notifier_block *nb)
989 {
990         return blocking_notifier_chain_unregister(&inetaddr_chain, nb);
991 }
992
993 /* Rename ifa_labels for a device name change. Make some effort to preserve existing
994  * alias numbering and to create unique labels if possible.
995 */
996 static void inetdev_changename(struct net_device *dev, struct in_device *in_dev)
997 {
998         struct in_ifaddr *ifa;
999         int named = 0;
1000
1001         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1002                 char old[IFNAMSIZ], *dot;
1003
1004                 memcpy(old, ifa->ifa_label, IFNAMSIZ);
1005                 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1006                 if (named++ == 0)
1007                         goto skip;
1008                 dot = strchr(old, ':');
1009                 if (dot == NULL) {
1010                         sprintf(old, ":%d", named);
1011                         dot = old;
1012                 }
1013                 if (strlen(dot) + strlen(dev->name) < IFNAMSIZ) {
1014                         strcat(ifa->ifa_label, dot);
1015                 } else {
1016                         strcpy(ifa->ifa_label + (IFNAMSIZ - strlen(dot) - 1), dot);
1017                 }
1018 skip:
1019                 rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0);
1020         }
1021 }
1022
1023 static inline bool inetdev_valid_mtu(unsigned mtu)
1024 {
1025         return mtu >= 68;
1026 }
1027
1028 /* Called only under RTNL semaphore */
1029
1030 static int inetdev_event(struct notifier_block *this, unsigned long event,
1031                          void *ptr)
1032 {
1033         struct net_device *dev = ptr;
1034         struct in_device *in_dev = __in_dev_get_rtnl(dev);
1035
1036         ASSERT_RTNL();
1037
1038         if (!in_dev) {
1039                 if (event == NETDEV_REGISTER) {
1040                         in_dev = inetdev_init(dev);
1041                         if (!in_dev)
1042                                 return notifier_from_errno(-ENOMEM);
1043                         if (dev->flags & IFF_LOOPBACK) {
1044                                 IN_DEV_CONF_SET(in_dev, NOXFRM, 1);
1045                                 IN_DEV_CONF_SET(in_dev, NOPOLICY, 1);
1046                         }
1047                 } else if (event == NETDEV_CHANGEMTU) {
1048                         /* Re-enabling IP */
1049                         if (inetdev_valid_mtu(dev->mtu))
1050                                 in_dev = inetdev_init(dev);
1051                 }
1052                 goto out;
1053         }
1054
1055         switch (event) {
1056         case NETDEV_REGISTER:
1057                 printk(KERN_DEBUG "inetdev_event: bug\n");
1058                 dev->ip_ptr = NULL;
1059                 break;
1060         case NETDEV_UP:
1061                 if (!inetdev_valid_mtu(dev->mtu))
1062                         break;
1063                 if (dev->flags & IFF_LOOPBACK) {
1064                         struct in_ifaddr *ifa;
1065                         if ((ifa = inet_alloc_ifa()) != NULL) {
1066                                 ifa->ifa_local =
1067                                   ifa->ifa_address = htonl(INADDR_LOOPBACK);
1068                                 ifa->ifa_prefixlen = 8;
1069                                 ifa->ifa_mask = inet_make_mask(8);
1070                                 in_dev_hold(in_dev);
1071                                 ifa->ifa_dev = in_dev;
1072                                 ifa->ifa_scope = RT_SCOPE_HOST;
1073                                 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1074                                 inet_insert_ifa(ifa);
1075                         }
1076                 }
1077                 ip_mc_up(in_dev);
1078                 /* fall through */
1079         case NETDEV_CHANGEADDR:
1080                 if (IN_DEV_ARP_NOTIFY(in_dev))
1081                         arp_send(ARPOP_REQUEST, ETH_P_ARP,
1082                                  in_dev->ifa_list->ifa_address,
1083                                  dev,
1084                                  in_dev->ifa_list->ifa_address,
1085                                  NULL, dev->dev_addr, NULL);
1086                 break;
1087         case NETDEV_DOWN:
1088                 ip_mc_down(in_dev);
1089                 break;
1090         case NETDEV_CHANGEMTU:
1091                 if (inetdev_valid_mtu(dev->mtu))
1092                         break;
1093                 /* disable IP when MTU is not enough */
1094         case NETDEV_UNREGISTER:
1095                 inetdev_destroy(in_dev);
1096                 break;
1097         case NETDEV_CHANGENAME:
1098                 /* Do not notify about label change, this event is
1099                  * not interesting to applications using netlink.
1100                  */
1101                 inetdev_changename(dev, in_dev);
1102
1103                 devinet_sysctl_unregister(in_dev);
1104                 devinet_sysctl_register(in_dev);
1105                 break;
1106         }
1107 out:
1108         return NOTIFY_DONE;
1109 }
1110
1111 static struct notifier_block ip_netdev_notifier = {
1112         .notifier_call = inetdev_event,
1113 };
1114
1115 static inline size_t inet_nlmsg_size(void)
1116 {
1117         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
1118                + nla_total_size(4) /* IFA_ADDRESS */
1119                + nla_total_size(4) /* IFA_LOCAL */
1120                + nla_total_size(4) /* IFA_BROADCAST */
1121                + nla_total_size(IFNAMSIZ); /* IFA_LABEL */
1122 }
1123
1124 static int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa,
1125                             u32 pid, u32 seq, int event, unsigned int flags)
1126 {
1127         struct ifaddrmsg *ifm;
1128         struct nlmsghdr  *nlh;
1129
1130         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*ifm), flags);
1131         if (nlh == NULL)
1132                 return -EMSGSIZE;
1133
1134         ifm = nlmsg_data(nlh);
1135         ifm->ifa_family = AF_INET;
1136         ifm->ifa_prefixlen = ifa->ifa_prefixlen;
1137         ifm->ifa_flags = ifa->ifa_flags|IFA_F_PERMANENT;
1138         ifm->ifa_scope = ifa->ifa_scope;
1139         ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
1140
1141         if (ifa->ifa_address)
1142                 NLA_PUT_BE32(skb, IFA_ADDRESS, ifa->ifa_address);
1143
1144         if (ifa->ifa_local)
1145                 NLA_PUT_BE32(skb, IFA_LOCAL, ifa->ifa_local);
1146
1147         if (ifa->ifa_broadcast)
1148                 NLA_PUT_BE32(skb, IFA_BROADCAST, ifa->ifa_broadcast);
1149
1150         if (ifa->ifa_label[0])
1151                 NLA_PUT_STRING(skb, IFA_LABEL, ifa->ifa_label);
1152
1153         return nlmsg_end(skb, nlh);
1154
1155 nla_put_failure:
1156         nlmsg_cancel(skb, nlh);
1157         return -EMSGSIZE;
1158 }
1159
1160 static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
1161 {
1162         struct net *net = sock_net(skb->sk);
1163         int idx, ip_idx;
1164         struct net_device *dev;
1165         struct in_device *in_dev;
1166         struct in_ifaddr *ifa;
1167         int s_ip_idx, s_idx = cb->args[0];
1168
1169         s_ip_idx = ip_idx = cb->args[1];
1170         idx = 0;
1171         for_each_netdev(net, dev) {
1172                 if (idx < s_idx)
1173                         goto cont;
1174                 if (idx > s_idx)
1175                         s_ip_idx = 0;
1176                 if ((in_dev = __in_dev_get_rtnl(dev)) == NULL)
1177                         goto cont;
1178
1179                 for (ifa = in_dev->ifa_list, ip_idx = 0; ifa;
1180                      ifa = ifa->ifa_next, ip_idx++) {
1181                         if (ip_idx < s_ip_idx)
1182                                 continue;
1183                         if (inet_fill_ifaddr(skb, ifa, NETLINK_CB(cb->skb).pid,
1184                                              cb->nlh->nlmsg_seq,
1185                                              RTM_NEWADDR, NLM_F_MULTI) <= 0)
1186                                 goto done;
1187                 }
1188 cont:
1189                 idx++;
1190         }
1191
1192 done:
1193         cb->args[0] = idx;
1194         cb->args[1] = ip_idx;
1195
1196         return skb->len;
1197 }
1198
1199 static void rtmsg_ifa(int event, struct in_ifaddr *ifa, struct nlmsghdr *nlh,
1200                       u32 pid)
1201 {
1202         struct sk_buff *skb;
1203         u32 seq = nlh ? nlh->nlmsg_seq : 0;
1204         int err = -ENOBUFS;
1205         struct net *net;
1206
1207         net = dev_net(ifa->ifa_dev->dev);
1208         skb = nlmsg_new(inet_nlmsg_size(), GFP_KERNEL);
1209         if (skb == NULL)
1210                 goto errout;
1211
1212         err = inet_fill_ifaddr(skb, ifa, pid, seq, event, 0);
1213         if (err < 0) {
1214                 /* -EMSGSIZE implies BUG in inet_nlmsg_size() */
1215                 WARN_ON(err == -EMSGSIZE);
1216                 kfree_skb(skb);
1217                 goto errout;
1218         }
1219         err = rtnl_notify(skb, net, pid, RTNLGRP_IPV4_IFADDR, nlh, GFP_KERNEL);
1220 errout:
1221         if (err < 0)
1222                 rtnl_set_sk_err(net, RTNLGRP_IPV4_IFADDR, err);
1223 }
1224
1225 #ifdef CONFIG_SYSCTL
1226
1227 static void devinet_copy_dflt_conf(struct net *net, int i)
1228 {
1229         struct net_device *dev;
1230
1231         read_lock(&dev_base_lock);
1232         for_each_netdev(net, dev) {
1233                 struct in_device *in_dev;
1234                 rcu_read_lock();
1235                 in_dev = __in_dev_get_rcu(dev);
1236                 if (in_dev && !test_bit(i, in_dev->cnf.state))
1237                         in_dev->cnf.data[i] = net->ipv4.devconf_dflt->data[i];
1238                 rcu_read_unlock();
1239         }
1240         read_unlock(&dev_base_lock);
1241 }
1242
1243 static void inet_forward_change(struct net *net)
1244 {
1245         struct net_device *dev;
1246         int on = IPV4_DEVCONF_ALL(net, FORWARDING);
1247
1248         IPV4_DEVCONF_ALL(net, ACCEPT_REDIRECTS) = !on;
1249         IPV4_DEVCONF_DFLT(net, FORWARDING) = on;
1250
1251         read_lock(&dev_base_lock);
1252         for_each_netdev(net, dev) {
1253                 struct in_device *in_dev;
1254                 if (on)
1255                         dev_disable_lro(dev);
1256                 rcu_read_lock();
1257                 in_dev = __in_dev_get_rcu(dev);
1258                 if (in_dev)
1259                         IN_DEV_CONF_SET(in_dev, FORWARDING, on);
1260                 rcu_read_unlock();
1261         }
1262         read_unlock(&dev_base_lock);
1263 }
1264
1265 static int devinet_conf_proc(ctl_table *ctl, int write,
1266                              struct file *filp, void __user *buffer,
1267                              size_t *lenp, loff_t *ppos)
1268 {
1269         int ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
1270
1271         if (write) {
1272                 struct ipv4_devconf *cnf = ctl->extra1;
1273                 struct net *net = ctl->extra2;
1274                 int i = (int *)ctl->data - cnf->data;
1275
1276                 set_bit(i, cnf->state);
1277
1278                 if (cnf == net->ipv4.devconf_dflt)
1279                         devinet_copy_dflt_conf(net, i);
1280         }
1281
1282         return ret;
1283 }
1284
1285 static int devinet_conf_sysctl(ctl_table *table,
1286                                void __user *oldval, size_t __user *oldlenp,
1287                                void __user *newval, size_t newlen)
1288 {
1289         struct ipv4_devconf *cnf;
1290         struct net *net;
1291         int *valp = table->data;
1292         int new;
1293         int i;
1294
1295         if (!newval || !newlen)
1296                 return 0;
1297
1298         if (newlen != sizeof(int))
1299                 return -EINVAL;
1300
1301         if (get_user(new, (int __user *)newval))
1302                 return -EFAULT;
1303
1304         if (new == *valp)
1305                 return 0;
1306
1307         if (oldval && oldlenp) {
1308                 size_t len;
1309
1310                 if (get_user(len, oldlenp))
1311                         return -EFAULT;
1312
1313                 if (len) {
1314                         if (len > table->maxlen)
1315                                 len = table->maxlen;
1316                         if (copy_to_user(oldval, valp, len))
1317                                 return -EFAULT;
1318                         if (put_user(len, oldlenp))
1319                                 return -EFAULT;
1320                 }
1321         }
1322
1323         *valp = new;
1324
1325         cnf = table->extra1;
1326         net = table->extra2;
1327         i = (int *)table->data - cnf->data;
1328
1329         set_bit(i, cnf->state);
1330
1331         if (cnf == net->ipv4.devconf_dflt)
1332                 devinet_copy_dflt_conf(net, i);
1333
1334         return 1;
1335 }
1336
1337 static int devinet_sysctl_forward(ctl_table *ctl, int write,
1338                                   struct file *filp, void __user *buffer,
1339                                   size_t *lenp, loff_t *ppos)
1340 {
1341         int *valp = ctl->data;
1342         int val = *valp;
1343         int ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
1344
1345         if (write && *valp != val) {
1346                 struct net *net = ctl->extra2;
1347
1348                 if (valp != &IPV4_DEVCONF_DFLT(net, FORWARDING)) {
1349                         rtnl_lock();
1350                         if (valp == &IPV4_DEVCONF_ALL(net, FORWARDING)) {
1351                                 inet_forward_change(net);
1352                         } else if (*valp) {
1353                                 struct ipv4_devconf *cnf = ctl->extra1;
1354                                 struct in_device *idev =
1355                                         container_of(cnf, struct in_device, cnf);
1356                                 dev_disable_lro(idev->dev);
1357                         }
1358                         rtnl_unlock();
1359                         rt_cache_flush(net, 0);
1360                 }
1361         }
1362
1363         return ret;
1364 }
1365
1366 int ipv4_doint_and_flush(ctl_table *ctl, int write,
1367                          struct file *filp, void __user *buffer,
1368                          size_t *lenp, loff_t *ppos)
1369 {
1370         int *valp = ctl->data;
1371         int val = *valp;
1372         int ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
1373         struct net *net = ctl->extra2;
1374
1375         if (write && *valp != val)
1376                 rt_cache_flush(net, 0);
1377
1378         return ret;
1379 }
1380
1381 int ipv4_doint_and_flush_strategy(ctl_table *table,
1382                                   void __user *oldval, size_t __user *oldlenp,
1383                                   void __user *newval, size_t newlen)
1384 {
1385         int ret = devinet_conf_sysctl(table, oldval, oldlenp, newval, newlen);
1386         struct net *net = table->extra2;
1387
1388         if (ret == 1)
1389                 rt_cache_flush(net, 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                 DEVINET_SYSCTL_RW_ENTRY(ARP_NOTIFY, "arp_notify"),
1451
1452                 DEVINET_SYSCTL_FLUSHING_ENTRY(NOXFRM, "disable_xfrm"),
1453                 DEVINET_SYSCTL_FLUSHING_ENTRY(NOPOLICY, "disable_policy"),
1454                 DEVINET_SYSCTL_FLUSHING_ENTRY(FORCE_IGMP_VERSION,
1455                                               "force_igmp_version"),
1456                 DEVINET_SYSCTL_FLUSHING_ENTRY(PROMOTE_SECONDARIES,
1457                                               "promote_secondaries"),
1458         },
1459 };
1460
1461 static int __devinet_sysctl_register(struct net *net, char *dev_name,
1462                 int ctl_name, struct ipv4_devconf *p)
1463 {
1464         int i;
1465         struct devinet_sysctl_table *t;
1466
1467 #define DEVINET_CTL_PATH_DEV    3
1468
1469         struct ctl_path devinet_ctl_path[] = {
1470                 { .procname = "net", .ctl_name = CTL_NET, },
1471                 { .procname = "ipv4", .ctl_name = NET_IPV4, },
1472                 { .procname = "conf", .ctl_name = NET_IPV4_CONF, },
1473                 { /* to be set */ },
1474                 { },
1475         };
1476
1477         t = kmemdup(&devinet_sysctl, sizeof(*t), GFP_KERNEL);
1478         if (!t)
1479                 goto out;
1480
1481         for (i = 0; i < ARRAY_SIZE(t->devinet_vars) - 1; i++) {
1482                 t->devinet_vars[i].data += (char *)p - (char *)&ipv4_devconf;
1483                 t->devinet_vars[i].extra1 = p;
1484                 t->devinet_vars[i].extra2 = net;
1485         }
1486
1487         /*
1488          * Make a copy of dev_name, because '.procname' is regarded as const
1489          * by sysctl and we wouldn't want anyone to change it under our feet
1490          * (see SIOCSIFNAME).
1491          */
1492         t->dev_name = kstrdup(dev_name, GFP_KERNEL);
1493         if (!t->dev_name)
1494                 goto free;
1495
1496         devinet_ctl_path[DEVINET_CTL_PATH_DEV].procname = t->dev_name;
1497         devinet_ctl_path[DEVINET_CTL_PATH_DEV].ctl_name = ctl_name;
1498
1499         t->sysctl_header = register_net_sysctl_table(net, devinet_ctl_path,
1500                         t->devinet_vars);
1501         if (!t->sysctl_header)
1502                 goto free_procname;
1503
1504         p->sysctl = t;
1505         return 0;
1506
1507 free_procname:
1508         kfree(t->dev_name);
1509 free:
1510         kfree(t);
1511 out:
1512         return -ENOBUFS;
1513 }
1514
1515 static void __devinet_sysctl_unregister(struct ipv4_devconf *cnf)
1516 {
1517         struct devinet_sysctl_table *t = cnf->sysctl;
1518
1519         if (t == NULL)
1520                 return;
1521
1522         cnf->sysctl = NULL;
1523         unregister_sysctl_table(t->sysctl_header);
1524         kfree(t->dev_name);
1525         kfree(t);
1526 }
1527
1528 static void devinet_sysctl_register(struct in_device *idev)
1529 {
1530         neigh_sysctl_register(idev->dev, idev->arp_parms, NET_IPV4,
1531                         NET_IPV4_NEIGH, "ipv4", NULL, NULL);
1532         __devinet_sysctl_register(dev_net(idev->dev), idev->dev->name,
1533                         idev->dev->ifindex, &idev->cnf);
1534 }
1535
1536 static void devinet_sysctl_unregister(struct in_device *idev)
1537 {
1538         __devinet_sysctl_unregister(&idev->cnf);
1539         neigh_sysctl_unregister(idev->arp_parms);
1540 }
1541
1542 static struct ctl_table ctl_forward_entry[] = {
1543         {
1544                 .ctl_name       = NET_IPV4_FORWARD,
1545                 .procname       = "ip_forward",
1546                 .data           = &ipv4_devconf.data[
1547                                         NET_IPV4_CONF_FORWARDING - 1],
1548                 .maxlen         = sizeof(int),
1549                 .mode           = 0644,
1550                 .proc_handler   = devinet_sysctl_forward,
1551                 .strategy       = devinet_conf_sysctl,
1552                 .extra1         = &ipv4_devconf,
1553                 .extra2         = &init_net,
1554         },
1555         { },
1556 };
1557
1558 static __net_initdata struct ctl_path net_ipv4_path[] = {
1559         { .procname = "net", .ctl_name = CTL_NET, },
1560         { .procname = "ipv4", .ctl_name = NET_IPV4, },
1561         { },
1562 };
1563 #endif
1564
1565 static __net_init int devinet_init_net(struct net *net)
1566 {
1567         int err;
1568         struct ipv4_devconf *all, *dflt;
1569 #ifdef CONFIG_SYSCTL
1570         struct ctl_table *tbl = ctl_forward_entry;
1571         struct ctl_table_header *forw_hdr;
1572 #endif
1573
1574         err = -ENOMEM;
1575         all = &ipv4_devconf;
1576         dflt = &ipv4_devconf_dflt;
1577
1578         if (net != &init_net) {
1579                 all = kmemdup(all, sizeof(ipv4_devconf), GFP_KERNEL);
1580                 if (all == NULL)
1581                         goto err_alloc_all;
1582
1583                 dflt = kmemdup(dflt, sizeof(ipv4_devconf_dflt), GFP_KERNEL);
1584                 if (dflt == NULL)
1585                         goto err_alloc_dflt;
1586
1587 #ifdef CONFIG_SYSCTL
1588                 tbl = kmemdup(tbl, sizeof(ctl_forward_entry), GFP_KERNEL);
1589                 if (tbl == NULL)
1590                         goto err_alloc_ctl;
1591
1592                 tbl[0].data = &all->data[NET_IPV4_CONF_FORWARDING - 1];
1593                 tbl[0].extra1 = all;
1594                 tbl[0].extra2 = net;
1595 #endif
1596         }
1597
1598 #ifdef CONFIG_SYSCTL
1599         err = __devinet_sysctl_register(net, "all",
1600                         NET_PROTO_CONF_ALL, all);
1601         if (err < 0)
1602                 goto err_reg_all;
1603
1604         err = __devinet_sysctl_register(net, "default",
1605                         NET_PROTO_CONF_DEFAULT, dflt);
1606         if (err < 0)
1607                 goto err_reg_dflt;
1608
1609         err = -ENOMEM;
1610         forw_hdr = register_net_sysctl_table(net, net_ipv4_path, tbl);
1611         if (forw_hdr == NULL)
1612                 goto err_reg_ctl;
1613         net->ipv4.forw_hdr = forw_hdr;
1614 #endif
1615
1616         net->ipv4.devconf_all = all;
1617         net->ipv4.devconf_dflt = dflt;
1618         return 0;
1619
1620 #ifdef CONFIG_SYSCTL
1621 err_reg_ctl:
1622         __devinet_sysctl_unregister(dflt);
1623 err_reg_dflt:
1624         __devinet_sysctl_unregister(all);
1625 err_reg_all:
1626         if (tbl != ctl_forward_entry)
1627                 kfree(tbl);
1628 err_alloc_ctl:
1629 #endif
1630         if (dflt != &ipv4_devconf_dflt)
1631                 kfree(dflt);
1632 err_alloc_dflt:
1633         if (all != &ipv4_devconf)
1634                 kfree(all);
1635 err_alloc_all:
1636         return err;
1637 }
1638
1639 static __net_exit void devinet_exit_net(struct net *net)
1640 {
1641 #ifdef CONFIG_SYSCTL
1642         struct ctl_table *tbl;
1643
1644         tbl = net->ipv4.forw_hdr->ctl_table_arg;
1645         unregister_net_sysctl_table(net->ipv4.forw_hdr);
1646         __devinet_sysctl_unregister(net->ipv4.devconf_dflt);
1647         __devinet_sysctl_unregister(net->ipv4.devconf_all);
1648         kfree(tbl);
1649 #endif
1650         kfree(net->ipv4.devconf_dflt);
1651         kfree(net->ipv4.devconf_all);
1652 }
1653
1654 static __net_initdata struct pernet_operations devinet_ops = {
1655         .init = devinet_init_net,
1656         .exit = devinet_exit_net,
1657 };
1658
1659 void __init devinet_init(void)
1660 {
1661         register_pernet_subsys(&devinet_ops);
1662
1663         register_gifconf(PF_INET, inet_gifconf);
1664         register_netdevice_notifier(&ip_netdev_notifier);
1665
1666         rtnl_register(PF_INET, RTM_NEWADDR, inet_rtm_newaddr, NULL);
1667         rtnl_register(PF_INET, RTM_DELADDR, inet_rtm_deladdr, NULL);
1668         rtnl_register(PF_INET, RTM_GETADDR, NULL, inet_dump_ifaddr);
1669 }
1670
1671 EXPORT_SYMBOL(in_dev_finish_destroy);
1672 EXPORT_SYMBOL(inet_select_addr);
1673 EXPORT_SYMBOL(inetdev_by_index);
1674 EXPORT_SYMBOL(register_inetaddr_notifier);
1675 EXPORT_SYMBOL(unregister_inetaddr_notifier);