2 * NET3 IP device support routines.
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.
9 * Derived from the IP parts of dev.c 1.0.19
11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 * Mark Evans, <evansmp@uhura.aston.ac.uk>
15 * Alan Cox, <gw4pts@gw4pts.ampr.org>
16 * Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
19 * Alexey Kuznetsov: pa_* fields are replaced with ifaddr
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
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>
38 #include <linux/socket.h>
39 #include <linux/sockios.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 #include <linux/slab.h>
55 #include <linux/sysctl.h>
57 #include <linux/kmod.h>
61 #include <net/route.h>
62 #include <net/ip_fib.h>
63 #include <net/rtnetlink.h>
64 #include <net/net_namespace.h>
66 static struct ipv4_devconf ipv4_devconf
= {
68 [IPV4_DEVCONF_ACCEPT_REDIRECTS
- 1] = 1,
69 [IPV4_DEVCONF_SEND_REDIRECTS
- 1] = 1,
70 [IPV4_DEVCONF_SECURE_REDIRECTS
- 1] = 1,
71 [IPV4_DEVCONF_SHARED_MEDIA
- 1] = 1,
75 static struct ipv4_devconf ipv4_devconf_dflt
= {
77 [IPV4_DEVCONF_ACCEPT_REDIRECTS
- 1] = 1,
78 [IPV4_DEVCONF_SEND_REDIRECTS
- 1] = 1,
79 [IPV4_DEVCONF_SECURE_REDIRECTS
- 1] = 1,
80 [IPV4_DEVCONF_SHARED_MEDIA
- 1] = 1,
81 [IPV4_DEVCONF_ACCEPT_SOURCE_ROUTE
- 1] = 1,
85 #define IPV4_DEVCONF_DFLT(net, attr) \
86 IPV4_DEVCONF((*net->ipv4.devconf_dflt), attr)
88 static const struct nla_policy ifa_ipv4_policy
[IFA_MAX
+1] = {
89 [IFA_LOCAL
] = { .type
= NLA_U32
},
90 [IFA_ADDRESS
] = { .type
= NLA_U32
},
91 [IFA_BROADCAST
] = { .type
= NLA_U32
},
92 [IFA_LABEL
] = { .type
= NLA_STRING
, .len
= IFNAMSIZ
- 1 },
95 static void rtmsg_ifa(int event
, struct in_ifaddr
*, struct nlmsghdr
*, u32
);
97 static BLOCKING_NOTIFIER_HEAD(inetaddr_chain
);
98 static void inet_del_ifa(struct in_device
*in_dev
, struct in_ifaddr
**ifap
,
101 static void devinet_sysctl_register(struct in_device
*idev
);
102 static void devinet_sysctl_unregister(struct in_device
*idev
);
104 static inline void devinet_sysctl_register(struct in_device
*idev
)
107 static inline void devinet_sysctl_unregister(struct in_device
*idev
)
112 /* Locks all the inet devices. */
114 static struct in_ifaddr
*inet_alloc_ifa(void)
116 return kzalloc(sizeof(struct in_ifaddr
), GFP_KERNEL
);
119 static void inet_rcu_free_ifa(struct rcu_head
*head
)
121 struct in_ifaddr
*ifa
= container_of(head
, struct in_ifaddr
, rcu_head
);
123 in_dev_put(ifa
->ifa_dev
);
127 static inline void inet_free_ifa(struct in_ifaddr
*ifa
)
129 call_rcu(&ifa
->rcu_head
, inet_rcu_free_ifa
);
132 void in_dev_finish_destroy(struct in_device
*idev
)
134 struct net_device
*dev
= idev
->dev
;
136 WARN_ON(idev
->ifa_list
);
137 WARN_ON(idev
->mc_list
);
138 #ifdef NET_REFCNT_DEBUG
139 printk(KERN_DEBUG
"in_dev_finish_destroy: %p=%s\n",
140 idev
, dev
? dev
->name
: "NIL");
144 pr_err("Freeing alive in_device %p\n", idev
);
148 EXPORT_SYMBOL(in_dev_finish_destroy
);
150 static struct in_device
*inetdev_init(struct net_device
*dev
)
152 struct in_device
*in_dev
;
156 in_dev
= kzalloc(sizeof(*in_dev
), GFP_KERNEL
);
159 memcpy(&in_dev
->cnf
, dev_net(dev
)->ipv4
.devconf_dflt
,
160 sizeof(in_dev
->cnf
));
161 in_dev
->cnf
.sysctl
= NULL
;
163 in_dev
->arp_parms
= neigh_parms_alloc(dev
, &arp_tbl
);
164 if (!in_dev
->arp_parms
)
166 if (IPV4_DEVCONF(in_dev
->cnf
, FORWARDING
))
167 dev_disable_lro(dev
);
168 /* Reference in_dev->dev */
170 /* Account for reference dev->ip_ptr (below) */
173 devinet_sysctl_register(in_dev
);
174 ip_mc_init_dev(in_dev
);
175 if (dev
->flags
& IFF_UP
)
178 /* we can receive as soon as ip_ptr is set -- do this last */
179 rcu_assign_pointer(dev
->ip_ptr
, in_dev
);
188 static void in_dev_rcu_put(struct rcu_head
*head
)
190 struct in_device
*idev
= container_of(head
, struct in_device
, rcu_head
);
194 static void inetdev_destroy(struct in_device
*in_dev
)
196 struct in_ifaddr
*ifa
;
197 struct net_device
*dev
;
205 ip_mc_destroy_dev(in_dev
);
207 while ((ifa
= in_dev
->ifa_list
) != NULL
) {
208 inet_del_ifa(in_dev
, &in_dev
->ifa_list
, 0);
212 rcu_assign_pointer(dev
->ip_ptr
, NULL
);
214 devinet_sysctl_unregister(in_dev
);
215 neigh_parms_release(&arp_tbl
, in_dev
->arp_parms
);
218 call_rcu(&in_dev
->rcu_head
, in_dev_rcu_put
);
221 int inet_addr_onlink(struct in_device
*in_dev
, __be32 a
, __be32 b
)
224 for_primary_ifa(in_dev
) {
225 if (inet_ifa_match(a
, ifa
)) {
226 if (!b
|| inet_ifa_match(b
, ifa
)) {
231 } endfor_ifa(in_dev
);
236 static void __inet_del_ifa(struct in_device
*in_dev
, struct in_ifaddr
**ifap
,
237 int destroy
, struct nlmsghdr
*nlh
, u32 pid
)
239 struct in_ifaddr
*promote
= NULL
;
240 struct in_ifaddr
*ifa
, *ifa1
= *ifap
;
241 struct in_ifaddr
*last_prim
= in_dev
->ifa_list
;
242 struct in_ifaddr
*prev_prom
= NULL
;
243 int do_promote
= IN_DEV_PROMOTE_SECONDARIES(in_dev
);
247 /* 1. Deleting primary ifaddr forces deletion all secondaries
248 * unless alias promotion is set
251 if (!(ifa1
->ifa_flags
& IFA_F_SECONDARY
)) {
252 struct in_ifaddr
**ifap1
= &ifa1
->ifa_next
;
254 while ((ifa
= *ifap1
) != NULL
) {
255 if (!(ifa
->ifa_flags
& IFA_F_SECONDARY
) &&
256 ifa1
->ifa_scope
<= ifa
->ifa_scope
)
259 if (!(ifa
->ifa_flags
& IFA_F_SECONDARY
) ||
260 ifa1
->ifa_mask
!= ifa
->ifa_mask
||
261 !inet_ifa_match(ifa1
->ifa_address
, ifa
)) {
262 ifap1
= &ifa
->ifa_next
;
268 *ifap1
= ifa
->ifa_next
;
270 rtmsg_ifa(RTM_DELADDR
, ifa
, nlh
, pid
);
271 blocking_notifier_call_chain(&inetaddr_chain
,
283 *ifap
= ifa1
->ifa_next
;
285 /* 3. Announce address deletion */
287 /* Send message first, then call notifier.
288 At first sight, FIB update triggered by notifier
289 will refer to already deleted ifaddr, that could confuse
290 netlink listeners. It is not true: look, gated sees
291 that route deleted and if it still thinks that ifaddr
292 is valid, it will try to restore deleted routes... Grr.
293 So that, this order is correct.
295 rtmsg_ifa(RTM_DELADDR
, ifa1
, nlh
, pid
);
296 blocking_notifier_call_chain(&inetaddr_chain
, NETDEV_DOWN
, ifa1
);
301 prev_prom
->ifa_next
= promote
->ifa_next
;
302 promote
->ifa_next
= last_prim
->ifa_next
;
303 last_prim
->ifa_next
= promote
;
306 promote
->ifa_flags
&= ~IFA_F_SECONDARY
;
307 rtmsg_ifa(RTM_NEWADDR
, promote
, nlh
, pid
);
308 blocking_notifier_call_chain(&inetaddr_chain
,
310 for (ifa
= promote
->ifa_next
; ifa
; ifa
= ifa
->ifa_next
) {
311 if (ifa1
->ifa_mask
!= ifa
->ifa_mask
||
312 !inet_ifa_match(ifa1
->ifa_address
, ifa
))
322 static void inet_del_ifa(struct in_device
*in_dev
, struct in_ifaddr
**ifap
,
325 __inet_del_ifa(in_dev
, ifap
, destroy
, NULL
, 0);
328 static int __inet_insert_ifa(struct in_ifaddr
*ifa
, struct nlmsghdr
*nlh
,
331 struct in_device
*in_dev
= ifa
->ifa_dev
;
332 struct in_ifaddr
*ifa1
, **ifap
, **last_primary
;
336 if (!ifa
->ifa_local
) {
341 ifa
->ifa_flags
&= ~IFA_F_SECONDARY
;
342 last_primary
= &in_dev
->ifa_list
;
344 for (ifap
= &in_dev
->ifa_list
; (ifa1
= *ifap
) != NULL
;
345 ifap
= &ifa1
->ifa_next
) {
346 if (!(ifa1
->ifa_flags
& IFA_F_SECONDARY
) &&
347 ifa
->ifa_scope
<= ifa1
->ifa_scope
)
348 last_primary
= &ifa1
->ifa_next
;
349 if (ifa1
->ifa_mask
== ifa
->ifa_mask
&&
350 inet_ifa_match(ifa1
->ifa_address
, ifa
)) {
351 if (ifa1
->ifa_local
== ifa
->ifa_local
) {
355 if (ifa1
->ifa_scope
!= ifa
->ifa_scope
) {
359 ifa
->ifa_flags
|= IFA_F_SECONDARY
;
363 if (!(ifa
->ifa_flags
& IFA_F_SECONDARY
)) {
364 net_srandom(ifa
->ifa_local
);
368 ifa
->ifa_next
= *ifap
;
371 /* Send message first, then call notifier.
372 Notifier will trigger FIB update, so that
373 listeners of netlink will know about new ifaddr */
374 rtmsg_ifa(RTM_NEWADDR
, ifa
, nlh
, pid
);
375 blocking_notifier_call_chain(&inetaddr_chain
, NETDEV_UP
, ifa
);
380 static int inet_insert_ifa(struct in_ifaddr
*ifa
)
382 return __inet_insert_ifa(ifa
, NULL
, 0);
385 static int inet_set_ifa(struct net_device
*dev
, struct in_ifaddr
*ifa
)
387 struct in_device
*in_dev
= __in_dev_get_rtnl(dev
);
395 ipv4_devconf_setall(in_dev
);
396 if (ifa
->ifa_dev
!= in_dev
) {
397 WARN_ON(ifa
->ifa_dev
);
399 ifa
->ifa_dev
= in_dev
;
401 if (ipv4_is_loopback(ifa
->ifa_local
))
402 ifa
->ifa_scope
= RT_SCOPE_HOST
;
403 return inet_insert_ifa(ifa
);
406 /* Caller must hold RCU or RTNL :
407 * We dont take a reference on found in_device
409 struct in_device
*inetdev_by_index(struct net
*net
, int ifindex
)
411 struct net_device
*dev
;
412 struct in_device
*in_dev
= NULL
;
415 dev
= dev_get_by_index_rcu(net
, ifindex
);
417 in_dev
= rcu_dereference_rtnl(dev
->ip_ptr
);
421 EXPORT_SYMBOL(inetdev_by_index
);
423 /* Called only from RTNL semaphored context. No locks. */
425 struct in_ifaddr
*inet_ifa_byprefix(struct in_device
*in_dev
, __be32 prefix
,
430 for_primary_ifa(in_dev
) {
431 if (ifa
->ifa_mask
== mask
&& inet_ifa_match(prefix
, ifa
))
433 } endfor_ifa(in_dev
);
437 static int inet_rtm_deladdr(struct sk_buff
*skb
, struct nlmsghdr
*nlh
, void *arg
)
439 struct net
*net
= sock_net(skb
->sk
);
440 struct nlattr
*tb
[IFA_MAX
+1];
441 struct in_device
*in_dev
;
442 struct ifaddrmsg
*ifm
;
443 struct in_ifaddr
*ifa
, **ifap
;
448 err
= nlmsg_parse(nlh
, sizeof(*ifm
), tb
, IFA_MAX
, ifa_ipv4_policy
);
452 ifm
= nlmsg_data(nlh
);
453 in_dev
= inetdev_by_index(net
, ifm
->ifa_index
);
454 if (in_dev
== NULL
) {
459 for (ifap
= &in_dev
->ifa_list
; (ifa
= *ifap
) != NULL
;
460 ifap
= &ifa
->ifa_next
) {
462 ifa
->ifa_local
!= nla_get_be32(tb
[IFA_LOCAL
]))
465 if (tb
[IFA_LABEL
] && nla_strcmp(tb
[IFA_LABEL
], ifa
->ifa_label
))
468 if (tb
[IFA_ADDRESS
] &&
469 (ifm
->ifa_prefixlen
!= ifa
->ifa_prefixlen
||
470 !inet_ifa_match(nla_get_be32(tb
[IFA_ADDRESS
]), ifa
)))
473 __inet_del_ifa(in_dev
, ifap
, 1, nlh
, NETLINK_CB(skb
).pid
);
477 err
= -EADDRNOTAVAIL
;
482 static struct in_ifaddr
*rtm_to_ifaddr(struct net
*net
, struct nlmsghdr
*nlh
)
484 struct nlattr
*tb
[IFA_MAX
+1];
485 struct in_ifaddr
*ifa
;
486 struct ifaddrmsg
*ifm
;
487 struct net_device
*dev
;
488 struct in_device
*in_dev
;
491 err
= nlmsg_parse(nlh
, sizeof(*ifm
), tb
, IFA_MAX
, ifa_ipv4_policy
);
495 ifm
= nlmsg_data(nlh
);
497 if (ifm
->ifa_prefixlen
> 32 || tb
[IFA_LOCAL
] == NULL
)
500 dev
= __dev_get_by_index(net
, ifm
->ifa_index
);
505 in_dev
= __in_dev_get_rtnl(dev
);
510 ifa
= inet_alloc_ifa();
513 * A potential indev allocation can be left alive, it stays
514 * assigned to its device and is destroy with it.
518 ipv4_devconf_setall(in_dev
);
521 if (tb
[IFA_ADDRESS
] == NULL
)
522 tb
[IFA_ADDRESS
] = tb
[IFA_LOCAL
];
524 ifa
->ifa_prefixlen
= ifm
->ifa_prefixlen
;
525 ifa
->ifa_mask
= inet_make_mask(ifm
->ifa_prefixlen
);
526 ifa
->ifa_flags
= ifm
->ifa_flags
;
527 ifa
->ifa_scope
= ifm
->ifa_scope
;
528 ifa
->ifa_dev
= in_dev
;
530 ifa
->ifa_local
= nla_get_be32(tb
[IFA_LOCAL
]);
531 ifa
->ifa_address
= nla_get_be32(tb
[IFA_ADDRESS
]);
533 if (tb
[IFA_BROADCAST
])
534 ifa
->ifa_broadcast
= nla_get_be32(tb
[IFA_BROADCAST
]);
537 nla_strlcpy(ifa
->ifa_label
, tb
[IFA_LABEL
], IFNAMSIZ
);
539 memcpy(ifa
->ifa_label
, dev
->name
, IFNAMSIZ
);
547 static int inet_rtm_newaddr(struct sk_buff
*skb
, struct nlmsghdr
*nlh
, void *arg
)
549 struct net
*net
= sock_net(skb
->sk
);
550 struct in_ifaddr
*ifa
;
554 ifa
= rtm_to_ifaddr(net
, nlh
);
558 return __inet_insert_ifa(ifa
, nlh
, NETLINK_CB(skb
).pid
);
562 * Determine a default network mask, based on the IP address.
565 static inline int inet_abc_len(__be32 addr
)
567 int rc
= -1; /* Something else, probably a multicast. */
569 if (ipv4_is_zeronet(addr
))
572 __u32 haddr
= ntohl(addr
);
574 if (IN_CLASSA(haddr
))
576 else if (IN_CLASSB(haddr
))
578 else if (IN_CLASSC(haddr
))
586 int devinet_ioctl(struct net
*net
, unsigned int cmd
, void __user
*arg
)
589 struct sockaddr_in sin_orig
;
590 struct sockaddr_in
*sin
= (struct sockaddr_in
*)&ifr
.ifr_addr
;
591 struct in_device
*in_dev
;
592 struct in_ifaddr
**ifap
= NULL
;
593 struct in_ifaddr
*ifa
= NULL
;
594 struct net_device
*dev
;
597 int tryaddrmatch
= 0;
600 * Fetch the caller's info block into kernel space
603 if (copy_from_user(&ifr
, arg
, sizeof(struct ifreq
)))
605 ifr
.ifr_name
[IFNAMSIZ
- 1] = 0;
607 /* save original address for comparison */
608 memcpy(&sin_orig
, sin
, sizeof(*sin
));
610 colon
= strchr(ifr
.ifr_name
, ':');
614 dev_load(net
, ifr
.ifr_name
);
617 case SIOCGIFADDR
: /* Get interface address */
618 case SIOCGIFBRDADDR
: /* Get the broadcast address */
619 case SIOCGIFDSTADDR
: /* Get the destination address */
620 case SIOCGIFNETMASK
: /* Get the netmask for the interface */
621 /* Note that these ioctls will not sleep,
622 so that we do not impose a lock.
623 One day we will be forced to put shlock here (I mean SMP)
625 tryaddrmatch
= (sin_orig
.sin_family
== AF_INET
);
626 memset(sin
, 0, sizeof(*sin
));
627 sin
->sin_family
= AF_INET
;
632 if (!capable(CAP_NET_ADMIN
))
635 case SIOCSIFADDR
: /* Set interface address (and family) */
636 case SIOCSIFBRDADDR
: /* Set the broadcast address */
637 case SIOCSIFDSTADDR
: /* Set the destination address */
638 case SIOCSIFNETMASK
: /* Set the netmask for the interface */
640 if (!capable(CAP_NET_ADMIN
))
643 if (sin
->sin_family
!= AF_INET
)
654 dev
= __dev_get_by_name(net
, ifr
.ifr_name
);
661 in_dev
= __in_dev_get_rtnl(dev
);
664 /* Matthias Andree */
665 /* compare label and address (4.4BSD style) */
666 /* note: we only do this for a limited set of ioctls
667 and only if the original address family was AF_INET.
668 This is checked above. */
669 for (ifap
= &in_dev
->ifa_list
; (ifa
= *ifap
) != NULL
;
670 ifap
= &ifa
->ifa_next
) {
671 if (!strcmp(ifr
.ifr_name
, ifa
->ifa_label
) &&
672 sin_orig
.sin_addr
.s_addr
==
678 /* we didn't get a match, maybe the application is
679 4.3BSD-style and passed in junk so we fall back to
680 comparing just the label */
682 for (ifap
= &in_dev
->ifa_list
; (ifa
= *ifap
) != NULL
;
683 ifap
= &ifa
->ifa_next
)
684 if (!strcmp(ifr
.ifr_name
, ifa
->ifa_label
))
689 ret
= -EADDRNOTAVAIL
;
690 if (!ifa
&& cmd
!= SIOCSIFADDR
&& cmd
!= SIOCSIFFLAGS
)
694 case SIOCGIFADDR
: /* Get interface address */
695 sin
->sin_addr
.s_addr
= ifa
->ifa_local
;
698 case SIOCGIFBRDADDR
: /* Get the broadcast address */
699 sin
->sin_addr
.s_addr
= ifa
->ifa_broadcast
;
702 case SIOCGIFDSTADDR
: /* Get the destination address */
703 sin
->sin_addr
.s_addr
= ifa
->ifa_address
;
706 case SIOCGIFNETMASK
: /* Get the netmask for the interface */
707 sin
->sin_addr
.s_addr
= ifa
->ifa_mask
;
712 ret
= -EADDRNOTAVAIL
;
716 if (!(ifr
.ifr_flags
& IFF_UP
))
717 inet_del_ifa(in_dev
, ifap
, 1);
720 ret
= dev_change_flags(dev
, ifr
.ifr_flags
);
723 case SIOCSIFADDR
: /* Set interface address (and family) */
725 if (inet_abc_len(sin
->sin_addr
.s_addr
) < 0)
730 ifa
= inet_alloc_ifa();
734 memcpy(ifa
->ifa_label
, ifr
.ifr_name
, IFNAMSIZ
);
736 memcpy(ifa
->ifa_label
, dev
->name
, IFNAMSIZ
);
739 if (ifa
->ifa_local
== sin
->sin_addr
.s_addr
)
741 inet_del_ifa(in_dev
, ifap
, 0);
742 ifa
->ifa_broadcast
= 0;
746 ifa
->ifa_address
= ifa
->ifa_local
= sin
->sin_addr
.s_addr
;
748 if (!(dev
->flags
& IFF_POINTOPOINT
)) {
749 ifa
->ifa_prefixlen
= inet_abc_len(ifa
->ifa_address
);
750 ifa
->ifa_mask
= inet_make_mask(ifa
->ifa_prefixlen
);
751 if ((dev
->flags
& IFF_BROADCAST
) &&
752 ifa
->ifa_prefixlen
< 31)
753 ifa
->ifa_broadcast
= ifa
->ifa_address
|
756 ifa
->ifa_prefixlen
= 32;
757 ifa
->ifa_mask
= inet_make_mask(32);
759 ret
= inet_set_ifa(dev
, ifa
);
762 case SIOCSIFBRDADDR
: /* Set the broadcast address */
764 if (ifa
->ifa_broadcast
!= sin
->sin_addr
.s_addr
) {
765 inet_del_ifa(in_dev
, ifap
, 0);
766 ifa
->ifa_broadcast
= sin
->sin_addr
.s_addr
;
767 inet_insert_ifa(ifa
);
771 case SIOCSIFDSTADDR
: /* Set the destination address */
773 if (ifa
->ifa_address
== sin
->sin_addr
.s_addr
)
776 if (inet_abc_len(sin
->sin_addr
.s_addr
) < 0)
779 inet_del_ifa(in_dev
, ifap
, 0);
780 ifa
->ifa_address
= sin
->sin_addr
.s_addr
;
781 inet_insert_ifa(ifa
);
784 case SIOCSIFNETMASK
: /* Set the netmask for the interface */
787 * The mask we set must be legal.
790 if (bad_mask(sin
->sin_addr
.s_addr
, 0))
793 if (ifa
->ifa_mask
!= sin
->sin_addr
.s_addr
) {
794 __be32 old_mask
= ifa
->ifa_mask
;
795 inet_del_ifa(in_dev
, ifap
, 0);
796 ifa
->ifa_mask
= sin
->sin_addr
.s_addr
;
797 ifa
->ifa_prefixlen
= inet_mask_len(ifa
->ifa_mask
);
799 /* See if current broadcast address matches
800 * with current netmask, then recalculate
801 * the broadcast address. Otherwise it's a
802 * funny address, so don't touch it since
803 * the user seems to know what (s)he's doing...
805 if ((dev
->flags
& IFF_BROADCAST
) &&
806 (ifa
->ifa_prefixlen
< 31) &&
807 (ifa
->ifa_broadcast
==
808 (ifa
->ifa_local
|~old_mask
))) {
809 ifa
->ifa_broadcast
= (ifa
->ifa_local
|
810 ~sin
->sin_addr
.s_addr
);
812 inet_insert_ifa(ifa
);
822 ret
= copy_to_user(arg
, &ifr
, sizeof(struct ifreq
)) ? -EFAULT
: 0;
826 static int inet_gifconf(struct net_device
*dev
, char __user
*buf
, int len
)
828 struct in_device
*in_dev
= __in_dev_get_rtnl(dev
);
829 struct in_ifaddr
*ifa
;
836 for (ifa
= in_dev
->ifa_list
; ifa
; ifa
= ifa
->ifa_next
) {
841 if (len
< (int) sizeof(ifr
))
843 memset(&ifr
, 0, sizeof(struct ifreq
));
845 strcpy(ifr
.ifr_name
, ifa
->ifa_label
);
847 strcpy(ifr
.ifr_name
, dev
->name
);
849 (*(struct sockaddr_in
*)&ifr
.ifr_addr
).sin_family
= AF_INET
;
850 (*(struct sockaddr_in
*)&ifr
.ifr_addr
).sin_addr
.s_addr
=
853 if (copy_to_user(buf
, &ifr
, sizeof(struct ifreq
))) {
857 buf
+= sizeof(struct ifreq
);
858 len
-= sizeof(struct ifreq
);
859 done
+= sizeof(struct ifreq
);
865 __be32
inet_select_addr(const struct net_device
*dev
, __be32 dst
, int scope
)
868 struct in_device
*in_dev
;
869 struct net
*net
= dev_net(dev
);
872 in_dev
= __in_dev_get_rcu(dev
);
876 for_primary_ifa(in_dev
) {
877 if (ifa
->ifa_scope
> scope
)
879 if (!dst
|| inet_ifa_match(dst
, ifa
)) {
880 addr
= ifa
->ifa_local
;
884 addr
= ifa
->ifa_local
;
885 } endfor_ifa(in_dev
);
891 /* Not loopback addresses on loopback should be preferred
892 in this case. It is importnat that lo is the first interface
895 for_each_netdev_rcu(net
, dev
) {
896 in_dev
= __in_dev_get_rcu(dev
);
900 for_primary_ifa(in_dev
) {
901 if (ifa
->ifa_scope
!= RT_SCOPE_LINK
&&
902 ifa
->ifa_scope
<= scope
) {
903 addr
= ifa
->ifa_local
;
906 } endfor_ifa(in_dev
);
912 EXPORT_SYMBOL(inet_select_addr
);
914 static __be32
confirm_addr_indev(struct in_device
*in_dev
, __be32 dst
,
915 __be32 local
, int scope
)
922 (local
== ifa
->ifa_local
|| !local
) &&
923 ifa
->ifa_scope
<= scope
) {
924 addr
= ifa
->ifa_local
;
929 same
= (!local
|| inet_ifa_match(local
, ifa
)) &&
930 (!dst
|| inet_ifa_match(dst
, ifa
));
934 /* Is the selected addr into dst subnet? */
935 if (inet_ifa_match(addr
, ifa
))
937 /* No, then can we use new local src? */
938 if (ifa
->ifa_scope
<= scope
) {
939 addr
= ifa
->ifa_local
;
942 /* search for large dst subnet for addr */
946 } endfor_ifa(in_dev
);
948 return same
? addr
: 0;
952 * Confirm that local IP address exists using wildcards:
953 * - in_dev: only on this interface, 0=any interface
954 * - dst: only in the same subnet as dst, 0=any dst
955 * - local: address, 0=autoselect the local address
956 * - scope: maximum allowed scope value for the local address
958 __be32
inet_confirm_addr(struct in_device
*in_dev
,
959 __be32 dst
, __be32 local
, int scope
)
962 struct net_device
*dev
;
965 if (scope
!= RT_SCOPE_LINK
)
966 return confirm_addr_indev(in_dev
, dst
, local
, scope
);
968 net
= dev_net(in_dev
->dev
);
970 for_each_netdev_rcu(net
, dev
) {
971 in_dev
= __in_dev_get_rcu(dev
);
973 addr
= confirm_addr_indev(in_dev
, dst
, local
, scope
);
987 int register_inetaddr_notifier(struct notifier_block
*nb
)
989 return blocking_notifier_chain_register(&inetaddr_chain
, nb
);
991 EXPORT_SYMBOL(register_inetaddr_notifier
);
993 int unregister_inetaddr_notifier(struct notifier_block
*nb
)
995 return blocking_notifier_chain_unregister(&inetaddr_chain
, nb
);
997 EXPORT_SYMBOL(unregister_inetaddr_notifier
);
999 /* Rename ifa_labels for a device name change. Make some effort to preserve
1000 * existing alias numbering and to create unique labels if possible.
1002 static void inetdev_changename(struct net_device
*dev
, struct in_device
*in_dev
)
1004 struct in_ifaddr
*ifa
;
1007 for (ifa
= in_dev
->ifa_list
; ifa
; ifa
= ifa
->ifa_next
) {
1008 char old
[IFNAMSIZ
], *dot
;
1010 memcpy(old
, ifa
->ifa_label
, IFNAMSIZ
);
1011 memcpy(ifa
->ifa_label
, dev
->name
, IFNAMSIZ
);
1014 dot
= strchr(old
, ':');
1016 sprintf(old
, ":%d", named
);
1019 if (strlen(dot
) + strlen(dev
->name
) < IFNAMSIZ
)
1020 strcat(ifa
->ifa_label
, dot
);
1022 strcpy(ifa
->ifa_label
+ (IFNAMSIZ
- strlen(dot
) - 1), dot
);
1024 rtmsg_ifa(RTM_NEWADDR
, ifa
, NULL
, 0);
1028 static inline bool inetdev_valid_mtu(unsigned mtu
)
1033 static void inetdev_send_gratuitous_arp(struct net_device
*dev
,
1034 struct in_device
*in_dev
)
1037 struct in_ifaddr
*ifa
= in_dev
->ifa_list
;
1042 arp_send(ARPOP_REQUEST
, ETH_P_ARP
,
1043 ifa
->ifa_address
, dev
,
1044 ifa
->ifa_address
, NULL
,
1045 dev
->dev_addr
, NULL
);
1048 /* Called only under RTNL semaphore */
1050 static int inetdev_event(struct notifier_block
*this, unsigned long event
,
1053 struct net_device
*dev
= ptr
;
1054 struct in_device
*in_dev
= __in_dev_get_rtnl(dev
);
1059 if (event
== NETDEV_REGISTER
) {
1060 in_dev
= inetdev_init(dev
);
1062 return notifier_from_errno(-ENOMEM
);
1063 if (dev
->flags
& IFF_LOOPBACK
) {
1064 IN_DEV_CONF_SET(in_dev
, NOXFRM
, 1);
1065 IN_DEV_CONF_SET(in_dev
, NOPOLICY
, 1);
1067 } else if (event
== NETDEV_CHANGEMTU
) {
1068 /* Re-enabling IP */
1069 if (inetdev_valid_mtu(dev
->mtu
))
1070 in_dev
= inetdev_init(dev
);
1076 case NETDEV_REGISTER
:
1077 printk(KERN_DEBUG
"inetdev_event: bug\n");
1078 rcu_assign_pointer(dev
->ip_ptr
, NULL
);
1081 if (!inetdev_valid_mtu(dev
->mtu
))
1083 if (dev
->flags
& IFF_LOOPBACK
) {
1084 struct in_ifaddr
*ifa
= inet_alloc_ifa();
1088 ifa
->ifa_address
= htonl(INADDR_LOOPBACK
);
1089 ifa
->ifa_prefixlen
= 8;
1090 ifa
->ifa_mask
= inet_make_mask(8);
1091 in_dev_hold(in_dev
);
1092 ifa
->ifa_dev
= in_dev
;
1093 ifa
->ifa_scope
= RT_SCOPE_HOST
;
1094 memcpy(ifa
->ifa_label
, dev
->name
, IFNAMSIZ
);
1095 inet_insert_ifa(ifa
);
1100 case NETDEV_CHANGEADDR
:
1101 if (!IN_DEV_ARP_NOTIFY(in_dev
))
1104 case NETDEV_NOTIFY_PEERS
:
1105 /* Send gratuitous ARP to notify of link change */
1106 inetdev_send_gratuitous_arp(dev
, in_dev
);
1111 case NETDEV_PRE_TYPE_CHANGE
:
1112 ip_mc_unmap(in_dev
);
1114 case NETDEV_POST_TYPE_CHANGE
:
1115 ip_mc_remap(in_dev
);
1117 case NETDEV_CHANGEMTU
:
1118 if (inetdev_valid_mtu(dev
->mtu
))
1120 /* disable IP when MTU is not enough */
1121 case NETDEV_UNREGISTER
:
1122 inetdev_destroy(in_dev
);
1124 case NETDEV_CHANGENAME
:
1125 /* Do not notify about label change, this event is
1126 * not interesting to applications using netlink.
1128 inetdev_changename(dev
, in_dev
);
1130 devinet_sysctl_unregister(in_dev
);
1131 devinet_sysctl_register(in_dev
);
1138 static struct notifier_block ip_netdev_notifier
= {
1139 .notifier_call
= inetdev_event
,
1142 static inline size_t inet_nlmsg_size(void)
1144 return NLMSG_ALIGN(sizeof(struct ifaddrmsg
))
1145 + nla_total_size(4) /* IFA_ADDRESS */
1146 + nla_total_size(4) /* IFA_LOCAL */
1147 + nla_total_size(4) /* IFA_BROADCAST */
1148 + nla_total_size(IFNAMSIZ
); /* IFA_LABEL */
1151 static int inet_fill_ifaddr(struct sk_buff
*skb
, struct in_ifaddr
*ifa
,
1152 u32 pid
, u32 seq
, int event
, unsigned int flags
)
1154 struct ifaddrmsg
*ifm
;
1155 struct nlmsghdr
*nlh
;
1157 nlh
= nlmsg_put(skb
, pid
, seq
, event
, sizeof(*ifm
), flags
);
1161 ifm
= nlmsg_data(nlh
);
1162 ifm
->ifa_family
= AF_INET
;
1163 ifm
->ifa_prefixlen
= ifa
->ifa_prefixlen
;
1164 ifm
->ifa_flags
= ifa
->ifa_flags
|IFA_F_PERMANENT
;
1165 ifm
->ifa_scope
= ifa
->ifa_scope
;
1166 ifm
->ifa_index
= ifa
->ifa_dev
->dev
->ifindex
;
1168 if (ifa
->ifa_address
)
1169 NLA_PUT_BE32(skb
, IFA_ADDRESS
, ifa
->ifa_address
);
1172 NLA_PUT_BE32(skb
, IFA_LOCAL
, ifa
->ifa_local
);
1174 if (ifa
->ifa_broadcast
)
1175 NLA_PUT_BE32(skb
, IFA_BROADCAST
, ifa
->ifa_broadcast
);
1177 if (ifa
->ifa_label
[0])
1178 NLA_PUT_STRING(skb
, IFA_LABEL
, ifa
->ifa_label
);
1180 return nlmsg_end(skb
, nlh
);
1183 nlmsg_cancel(skb
, nlh
);
1187 static int inet_dump_ifaddr(struct sk_buff
*skb
, struct netlink_callback
*cb
)
1189 struct net
*net
= sock_net(skb
->sk
);
1192 int ip_idx
, s_ip_idx
;
1193 struct net_device
*dev
;
1194 struct in_device
*in_dev
;
1195 struct in_ifaddr
*ifa
;
1196 struct hlist_head
*head
;
1197 struct hlist_node
*node
;
1200 s_idx
= idx
= cb
->args
[1];
1201 s_ip_idx
= ip_idx
= cb
->args
[2];
1203 for (h
= s_h
; h
< NETDEV_HASHENTRIES
; h
++, s_idx
= 0) {
1205 head
= &net
->dev_index_head
[h
];
1207 hlist_for_each_entry_rcu(dev
, node
, head
, index_hlist
) {
1210 if (h
> s_h
|| idx
> s_idx
)
1212 in_dev
= __in_dev_get_rcu(dev
);
1216 for (ifa
= in_dev
->ifa_list
, ip_idx
= 0; ifa
;
1217 ifa
= ifa
->ifa_next
, ip_idx
++) {
1218 if (ip_idx
< s_ip_idx
)
1220 if (inet_fill_ifaddr(skb
, ifa
,
1221 NETLINK_CB(cb
->skb
).pid
,
1223 RTM_NEWADDR
, NLM_F_MULTI
) <= 0) {
1237 cb
->args
[2] = ip_idx
;
1242 static void rtmsg_ifa(int event
, struct in_ifaddr
*ifa
, struct nlmsghdr
*nlh
,
1245 struct sk_buff
*skb
;
1246 u32 seq
= nlh
? nlh
->nlmsg_seq
: 0;
1250 net
= dev_net(ifa
->ifa_dev
->dev
);
1251 skb
= nlmsg_new(inet_nlmsg_size(), GFP_KERNEL
);
1255 err
= inet_fill_ifaddr(skb
, ifa
, pid
, seq
, event
, 0);
1257 /* -EMSGSIZE implies BUG in inet_nlmsg_size() */
1258 WARN_ON(err
== -EMSGSIZE
);
1262 rtnl_notify(skb
, net
, pid
, RTNLGRP_IPV4_IFADDR
, nlh
, GFP_KERNEL
);
1266 rtnl_set_sk_err(net
, RTNLGRP_IPV4_IFADDR
, err
);
1269 static size_t inet_get_link_af_size(const struct net_device
*dev
)
1271 struct in_device
*in_dev
= __in_dev_get_rtnl(dev
);
1276 return nla_total_size(IPV4_DEVCONF_MAX
* 4); /* IFLA_INET_CONF */
1279 static int inet_fill_link_af(struct sk_buff
*skb
, const struct net_device
*dev
)
1281 struct in_device
*in_dev
= __in_dev_get_rtnl(dev
);
1288 nla
= nla_reserve(skb
, IFLA_INET_CONF
, IPV4_DEVCONF_MAX
* 4);
1292 for (i
= 0; i
< IPV4_DEVCONF_MAX
; i
++)
1293 ((u32
*) nla_data(nla
))[i
] = in_dev
->cnf
.data
[i
];
1298 static const struct nla_policy inet_af_policy
[IFLA_INET_MAX
+1] = {
1299 [IFLA_INET_CONF
] = { .type
= NLA_NESTED
},
1302 static int inet_validate_link_af(const struct net_device
*dev
,
1303 const struct nlattr
*nla
)
1305 struct nlattr
*a
, *tb
[IFLA_INET_MAX
+1];
1308 if (dev
&& !__in_dev_get_rtnl(dev
))
1309 return -EAFNOSUPPORT
;
1311 err
= nla_parse_nested(tb
, IFLA_INET_MAX
, nla
, inet_af_policy
);
1315 if (tb
[IFLA_INET_CONF
]) {
1316 nla_for_each_nested(a
, tb
[IFLA_INET_CONF
], rem
) {
1317 int cfgid
= nla_type(a
);
1322 if (cfgid
<= 0 || cfgid
> IPV4_DEVCONF_MAX
)
1330 static int inet_set_link_af(struct net_device
*dev
, const struct nlattr
*nla
)
1332 struct in_device
*in_dev
= __in_dev_get_rtnl(dev
);
1333 struct nlattr
*a
, *tb
[IFLA_INET_MAX
+1];
1337 return -EAFNOSUPPORT
;
1339 if (nla_parse_nested(tb
, IFLA_INET_MAX
, nla
, NULL
) < 0)
1342 if (tb
[IFLA_INET_CONF
]) {
1343 nla_for_each_nested(a
, tb
[IFLA_INET_CONF
], rem
)
1344 ipv4_devconf_set(in_dev
, nla_type(a
), nla_get_u32(a
));
1350 #ifdef CONFIG_SYSCTL
1352 static void devinet_copy_dflt_conf(struct net
*net
, int i
)
1354 struct net_device
*dev
;
1357 for_each_netdev_rcu(net
, dev
) {
1358 struct in_device
*in_dev
;
1360 in_dev
= __in_dev_get_rcu(dev
);
1361 if (in_dev
&& !test_bit(i
, in_dev
->cnf
.state
))
1362 in_dev
->cnf
.data
[i
] = net
->ipv4
.devconf_dflt
->data
[i
];
1367 /* called with RTNL locked */
1368 static void inet_forward_change(struct net
*net
)
1370 struct net_device
*dev
;
1371 int on
= IPV4_DEVCONF_ALL(net
, FORWARDING
);
1373 IPV4_DEVCONF_ALL(net
, ACCEPT_REDIRECTS
) = !on
;
1374 IPV4_DEVCONF_DFLT(net
, FORWARDING
) = on
;
1376 for_each_netdev(net
, dev
) {
1377 struct in_device
*in_dev
;
1379 dev_disable_lro(dev
);
1381 in_dev
= __in_dev_get_rcu(dev
);
1383 IN_DEV_CONF_SET(in_dev
, FORWARDING
, on
);
1388 static int devinet_conf_proc(ctl_table
*ctl
, int write
,
1389 void __user
*buffer
,
1390 size_t *lenp
, loff_t
*ppos
)
1392 int ret
= proc_dointvec(ctl
, write
, buffer
, lenp
, ppos
);
1395 struct ipv4_devconf
*cnf
= ctl
->extra1
;
1396 struct net
*net
= ctl
->extra2
;
1397 int i
= (int *)ctl
->data
- cnf
->data
;
1399 set_bit(i
, cnf
->state
);
1401 if (cnf
== net
->ipv4
.devconf_dflt
)
1402 devinet_copy_dflt_conf(net
, i
);
1408 static int devinet_sysctl_forward(ctl_table
*ctl
, int write
,
1409 void __user
*buffer
,
1410 size_t *lenp
, loff_t
*ppos
)
1412 int *valp
= ctl
->data
;
1415 int ret
= proc_dointvec(ctl
, write
, buffer
, lenp
, ppos
);
1417 if (write
&& *valp
!= val
) {
1418 struct net
*net
= ctl
->extra2
;
1420 if (valp
!= &IPV4_DEVCONF_DFLT(net
, FORWARDING
)) {
1421 if (!rtnl_trylock()) {
1422 /* Restore the original values before restarting */
1425 return restart_syscall();
1427 if (valp
== &IPV4_DEVCONF_ALL(net
, FORWARDING
)) {
1428 inet_forward_change(net
);
1430 struct ipv4_devconf
*cnf
= ctl
->extra1
;
1431 struct in_device
*idev
=
1432 container_of(cnf
, struct in_device
, cnf
);
1433 dev_disable_lro(idev
->dev
);
1436 rt_cache_flush(net
, 0);
1443 static int ipv4_doint_and_flush(ctl_table
*ctl
, int write
,
1444 void __user
*buffer
,
1445 size_t *lenp
, loff_t
*ppos
)
1447 int *valp
= ctl
->data
;
1449 int ret
= proc_dointvec(ctl
, write
, buffer
, lenp
, ppos
);
1450 struct net
*net
= ctl
->extra2
;
1452 if (write
&& *valp
!= val
)
1453 rt_cache_flush(net
, 0);
1458 #define DEVINET_SYSCTL_ENTRY(attr, name, mval, proc) \
1461 .data = ipv4_devconf.data + \
1462 IPV4_DEVCONF_ ## attr - 1, \
1463 .maxlen = sizeof(int), \
1465 .proc_handler = proc, \
1466 .extra1 = &ipv4_devconf, \
1469 #define DEVINET_SYSCTL_RW_ENTRY(attr, name) \
1470 DEVINET_SYSCTL_ENTRY(attr, name, 0644, devinet_conf_proc)
1472 #define DEVINET_SYSCTL_RO_ENTRY(attr, name) \
1473 DEVINET_SYSCTL_ENTRY(attr, name, 0444, devinet_conf_proc)
1475 #define DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, proc) \
1476 DEVINET_SYSCTL_ENTRY(attr, name, 0644, proc)
1478 #define DEVINET_SYSCTL_FLUSHING_ENTRY(attr, name) \
1479 DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, ipv4_doint_and_flush)
1481 static struct devinet_sysctl_table
{
1482 struct ctl_table_header
*sysctl_header
;
1483 struct ctl_table devinet_vars
[__IPV4_DEVCONF_MAX
];
1485 } devinet_sysctl
= {
1487 DEVINET_SYSCTL_COMPLEX_ENTRY(FORWARDING
, "forwarding",
1488 devinet_sysctl_forward
),
1489 DEVINET_SYSCTL_RO_ENTRY(MC_FORWARDING
, "mc_forwarding"),
1491 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_REDIRECTS
, "accept_redirects"),
1492 DEVINET_SYSCTL_RW_ENTRY(SECURE_REDIRECTS
, "secure_redirects"),
1493 DEVINET_SYSCTL_RW_ENTRY(SHARED_MEDIA
, "shared_media"),
1494 DEVINET_SYSCTL_RW_ENTRY(RP_FILTER
, "rp_filter"),
1495 DEVINET_SYSCTL_RW_ENTRY(SEND_REDIRECTS
, "send_redirects"),
1496 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_SOURCE_ROUTE
,
1497 "accept_source_route"),
1498 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_LOCAL
, "accept_local"),
1499 DEVINET_SYSCTL_RW_ENTRY(SRC_VMARK
, "src_valid_mark"),
1500 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP
, "proxy_arp"),
1501 DEVINET_SYSCTL_RW_ENTRY(MEDIUM_ID
, "medium_id"),
1502 DEVINET_SYSCTL_RW_ENTRY(BOOTP_RELAY
, "bootp_relay"),
1503 DEVINET_SYSCTL_RW_ENTRY(LOG_MARTIANS
, "log_martians"),
1504 DEVINET_SYSCTL_RW_ENTRY(TAG
, "tag"),
1505 DEVINET_SYSCTL_RW_ENTRY(ARPFILTER
, "arp_filter"),
1506 DEVINET_SYSCTL_RW_ENTRY(ARP_ANNOUNCE
, "arp_announce"),
1507 DEVINET_SYSCTL_RW_ENTRY(ARP_IGNORE
, "arp_ignore"),
1508 DEVINET_SYSCTL_RW_ENTRY(ARP_ACCEPT
, "arp_accept"),
1509 DEVINET_SYSCTL_RW_ENTRY(ARP_NOTIFY
, "arp_notify"),
1510 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP_PVLAN
, "proxy_arp_pvlan"),
1512 DEVINET_SYSCTL_FLUSHING_ENTRY(NOXFRM
, "disable_xfrm"),
1513 DEVINET_SYSCTL_FLUSHING_ENTRY(NOPOLICY
, "disable_policy"),
1514 DEVINET_SYSCTL_FLUSHING_ENTRY(FORCE_IGMP_VERSION
,
1515 "force_igmp_version"),
1516 DEVINET_SYSCTL_FLUSHING_ENTRY(PROMOTE_SECONDARIES
,
1517 "promote_secondaries"),
1521 static int __devinet_sysctl_register(struct net
*net
, char *dev_name
,
1522 struct ipv4_devconf
*p
)
1525 struct devinet_sysctl_table
*t
;
1527 #define DEVINET_CTL_PATH_DEV 3
1529 struct ctl_path devinet_ctl_path
[] = {
1530 { .procname
= "net", },
1531 { .procname
= "ipv4", },
1532 { .procname
= "conf", },
1533 { /* to be set */ },
1537 t
= kmemdup(&devinet_sysctl
, sizeof(*t
), GFP_KERNEL
);
1541 for (i
= 0; i
< ARRAY_SIZE(t
->devinet_vars
) - 1; i
++) {
1542 t
->devinet_vars
[i
].data
+= (char *)p
- (char *)&ipv4_devconf
;
1543 t
->devinet_vars
[i
].extra1
= p
;
1544 t
->devinet_vars
[i
].extra2
= net
;
1548 * Make a copy of dev_name, because '.procname' is regarded as const
1549 * by sysctl and we wouldn't want anyone to change it under our feet
1550 * (see SIOCSIFNAME).
1552 t
->dev_name
= kstrdup(dev_name
, GFP_KERNEL
);
1556 devinet_ctl_path
[DEVINET_CTL_PATH_DEV
].procname
= t
->dev_name
;
1558 t
->sysctl_header
= register_net_sysctl_table(net
, devinet_ctl_path
,
1560 if (!t
->sysctl_header
)
1574 static void __devinet_sysctl_unregister(struct ipv4_devconf
*cnf
)
1576 struct devinet_sysctl_table
*t
= cnf
->sysctl
;
1582 unregister_sysctl_table(t
->sysctl_header
);
1587 static void devinet_sysctl_register(struct in_device
*idev
)
1589 neigh_sysctl_register(idev
->dev
, idev
->arp_parms
, "ipv4", NULL
);
1590 __devinet_sysctl_register(dev_net(idev
->dev
), idev
->dev
->name
,
1594 static void devinet_sysctl_unregister(struct in_device
*idev
)
1596 __devinet_sysctl_unregister(&idev
->cnf
);
1597 neigh_sysctl_unregister(idev
->arp_parms
);
1600 static struct ctl_table ctl_forward_entry
[] = {
1602 .procname
= "ip_forward",
1603 .data
= &ipv4_devconf
.data
[
1604 IPV4_DEVCONF_FORWARDING
- 1],
1605 .maxlen
= sizeof(int),
1607 .proc_handler
= devinet_sysctl_forward
,
1608 .extra1
= &ipv4_devconf
,
1609 .extra2
= &init_net
,
1614 static __net_initdata
struct ctl_path net_ipv4_path
[] = {
1615 { .procname
= "net", },
1616 { .procname
= "ipv4", },
1621 static __net_init
int devinet_init_net(struct net
*net
)
1624 struct ipv4_devconf
*all
, *dflt
;
1625 #ifdef CONFIG_SYSCTL
1626 struct ctl_table
*tbl
= ctl_forward_entry
;
1627 struct ctl_table_header
*forw_hdr
;
1631 all
= &ipv4_devconf
;
1632 dflt
= &ipv4_devconf_dflt
;
1634 if (!net_eq(net
, &init_net
)) {
1635 all
= kmemdup(all
, sizeof(ipv4_devconf
), GFP_KERNEL
);
1639 dflt
= kmemdup(dflt
, sizeof(ipv4_devconf_dflt
), GFP_KERNEL
);
1641 goto err_alloc_dflt
;
1643 #ifdef CONFIG_SYSCTL
1644 tbl
= kmemdup(tbl
, sizeof(ctl_forward_entry
), GFP_KERNEL
);
1648 tbl
[0].data
= &all
->data
[IPV4_DEVCONF_FORWARDING
- 1];
1649 tbl
[0].extra1
= all
;
1650 tbl
[0].extra2
= net
;
1654 #ifdef CONFIG_SYSCTL
1655 err
= __devinet_sysctl_register(net
, "all", all
);
1659 err
= __devinet_sysctl_register(net
, "default", dflt
);
1664 forw_hdr
= register_net_sysctl_table(net
, net_ipv4_path
, tbl
);
1665 if (forw_hdr
== NULL
)
1667 net
->ipv4
.forw_hdr
= forw_hdr
;
1670 net
->ipv4
.devconf_all
= all
;
1671 net
->ipv4
.devconf_dflt
= dflt
;
1674 #ifdef CONFIG_SYSCTL
1676 __devinet_sysctl_unregister(dflt
);
1678 __devinet_sysctl_unregister(all
);
1680 if (tbl
!= ctl_forward_entry
)
1684 if (dflt
!= &ipv4_devconf_dflt
)
1687 if (all
!= &ipv4_devconf
)
1693 static __net_exit
void devinet_exit_net(struct net
*net
)
1695 #ifdef CONFIG_SYSCTL
1696 struct ctl_table
*tbl
;
1698 tbl
= net
->ipv4
.forw_hdr
->ctl_table_arg
;
1699 unregister_net_sysctl_table(net
->ipv4
.forw_hdr
);
1700 __devinet_sysctl_unregister(net
->ipv4
.devconf_dflt
);
1701 __devinet_sysctl_unregister(net
->ipv4
.devconf_all
);
1704 kfree(net
->ipv4
.devconf_dflt
);
1705 kfree(net
->ipv4
.devconf_all
);
1708 static __net_initdata
struct pernet_operations devinet_ops
= {
1709 .init
= devinet_init_net
,
1710 .exit
= devinet_exit_net
,
1713 static struct rtnl_af_ops inet_af_ops
= {
1715 .fill_link_af
= inet_fill_link_af
,
1716 .get_link_af_size
= inet_get_link_af_size
,
1717 .validate_link_af
= inet_validate_link_af
,
1718 .set_link_af
= inet_set_link_af
,
1721 void __init
devinet_init(void)
1723 register_pernet_subsys(&devinet_ops
);
1725 register_gifconf(PF_INET
, inet_gifconf
);
1726 register_netdevice_notifier(&ip_netdev_notifier
);
1728 rtnl_af_register(&inet_af_ops
);
1730 rtnl_register(PF_INET
, RTM_NEWADDR
, inet_rtm_newaddr
, NULL
);
1731 rtnl_register(PF_INET
, RTM_DELADDR
, inet_rtm_deladdr
, NULL
);
1732 rtnl_register(PF_INET
, RTM_GETADDR
, NULL
, inet_dump_ifaddr
);