/*
|
/*
|
* NETLINK Kernel-user communication protocol.
|
* NETLINK Kernel-user communication protocol.
|
*
|
*
|
* Authors: Alan Cox <alan@redhat.com>
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* Authors: Alan Cox <alan@redhat.com>
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* Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
|
* Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
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*
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*
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* This program is free software; you can redistribute it and/or
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* This program is free software; you can redistribute it and/or
|
* modify it under the terms of the GNU General Public License
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* modify it under the terms of the GNU General Public License
|
* as published by the Free Software Foundation; either version
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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* 2 of the License, or (at your option) any later version.
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*
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*
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* Tue Jun 26 14:36:48 MEST 2001 Herbert "herp" Rosmanith
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* Tue Jun 26 14:36:48 MEST 2001 Herbert "herp" Rosmanith
|
* added netlink_proto_exit
|
* added netlink_proto_exit
|
*
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*
|
*/
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*/
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|
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#include <linux/config.h>
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#include <linux/config.h>
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#include <linux/module.h>
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#include <linux/module.h>
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|
|
#include <linux/kernel.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/init.h>
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#include <linux/major.h>
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#include <linux/major.h>
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#include <linux/signal.h>
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#include <linux/signal.h>
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#include <linux/sched.h>
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#include <linux/sched.h>
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#include <linux/errno.h>
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#include <linux/errno.h>
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#include <linux/string.h>
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#include <linux/string.h>
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#include <linux/stat.h>
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#include <linux/stat.h>
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#include <linux/socket.h>
|
#include <linux/socket.h>
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#include <linux/un.h>
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#include <linux/un.h>
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#include <linux/fcntl.h>
|
#include <linux/fcntl.h>
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#include <linux/termios.h>
|
#include <linux/termios.h>
|
#include <linux/sockios.h>
|
#include <linux/sockios.h>
|
#include <linux/net.h>
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#include <linux/net.h>
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#include <linux/fs.h>
|
#include <linux/fs.h>
|
#include <linux/slab.h>
|
#include <linux/slab.h>
|
#include <asm/uaccess.h>
|
#include <asm/uaccess.h>
|
#include <linux/skbuff.h>
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#include <linux/skbuff.h>
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#include <linux/netdevice.h>
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#include <linux/netdevice.h>
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#include <linux/rtnetlink.h>
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#include <linux/rtnetlink.h>
|
#include <linux/proc_fs.h>
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#include <linux/proc_fs.h>
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#include <linux/smp_lock.h>
|
#include <linux/smp_lock.h>
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#include <linux/notifier.h>
|
#include <linux/notifier.h>
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#include <net/sock.h>
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#include <net/sock.h>
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#include <net/scm.h>
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#include <net/scm.h>
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|
|
#define Nprintk(a...)
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#define Nprintk(a...)
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|
|
#if defined(CONFIG_NETLINK_DEV) || defined(CONFIG_NETLINK_DEV_MODULE)
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#if defined(CONFIG_NETLINK_DEV) || defined(CONFIG_NETLINK_DEV_MODULE)
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#define NL_EMULATE_DEV
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#define NL_EMULATE_DEV
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#endif
|
#endif
|
|
|
struct netlink_opt
|
struct netlink_opt
|
{
|
{
|
u32 pid;
|
u32 pid;
|
unsigned groups;
|
unsigned groups;
|
u32 dst_pid;
|
u32 dst_pid;
|
unsigned dst_groups;
|
unsigned dst_groups;
|
unsigned long state;
|
unsigned long state;
|
int (*handler)(int unit, struct sk_buff *skb);
|
int (*handler)(int unit, struct sk_buff *skb);
|
wait_queue_head_t wait;
|
wait_queue_head_t wait;
|
struct netlink_callback *cb;
|
struct netlink_callback *cb;
|
spinlock_t cb_lock;
|
spinlock_t cb_lock;
|
void (*data_ready)(struct sock *sk, int bytes);
|
void (*data_ready)(struct sock *sk, int bytes);
|
};
|
};
|
|
|
static struct sock *nl_table[MAX_LINKS];
|
static struct sock *nl_table[MAX_LINKS];
|
static DECLARE_WAIT_QUEUE_HEAD(nl_table_wait);
|
static DECLARE_WAIT_QUEUE_HEAD(nl_table_wait);
|
static unsigned nl_nonroot[MAX_LINKS];
|
static unsigned nl_nonroot[MAX_LINKS];
|
|
|
#ifdef NL_EMULATE_DEV
|
#ifdef NL_EMULATE_DEV
|
static struct socket *netlink_kernel[MAX_LINKS];
|
static struct socket *netlink_kernel[MAX_LINKS];
|
#endif
|
#endif
|
|
|
static int netlink_dump(struct sock *sk);
|
static int netlink_dump(struct sock *sk);
|
static void netlink_destroy_callback(struct netlink_callback *cb);
|
static void netlink_destroy_callback(struct netlink_callback *cb);
|
|
|
atomic_t netlink_sock_nr;
|
atomic_t netlink_sock_nr;
|
|
|
static rwlock_t nl_table_lock = RW_LOCK_UNLOCKED;
|
static rwlock_t nl_table_lock = RW_LOCK_UNLOCKED;
|
static atomic_t nl_table_users = ATOMIC_INIT(0);
|
static atomic_t nl_table_users = ATOMIC_INIT(0);
|
|
|
static struct notifier_block *netlink_chain;
|
static struct notifier_block *netlink_chain;
|
|
|
static void netlink_sock_destruct(struct sock *sk)
|
static void netlink_sock_destruct(struct sock *sk)
|
{
|
{
|
skb_queue_purge(&sk->receive_queue);
|
skb_queue_purge(&sk->receive_queue);
|
|
|
if (!sk->dead) {
|
if (!sk->dead) {
|
printk("Freeing alive netlink socket %p\n", sk);
|
printk("Freeing alive netlink socket %p\n", sk);
|
return;
|
return;
|
}
|
}
|
BUG_TRAP(atomic_read(&sk->rmem_alloc)==0);
|
BUG_TRAP(atomic_read(&sk->rmem_alloc)==0);
|
BUG_TRAP(atomic_read(&sk->wmem_alloc)==0);
|
BUG_TRAP(atomic_read(&sk->wmem_alloc)==0);
|
BUG_TRAP(sk->protinfo.af_netlink->cb==NULL);
|
BUG_TRAP(sk->protinfo.af_netlink->cb==NULL);
|
|
|
kfree(sk->protinfo.af_netlink);
|
kfree(sk->protinfo.af_netlink);
|
|
|
atomic_dec(&netlink_sock_nr);
|
atomic_dec(&netlink_sock_nr);
|
#ifdef NETLINK_REFCNT_DEBUG
|
#ifdef NETLINK_REFCNT_DEBUG
|
printk(KERN_DEBUG "NETLINK %p released, %d are still alive\n", sk, atomic_read(&netlink_sock_nr));
|
printk(KERN_DEBUG "NETLINK %p released, %d are still alive\n", sk, atomic_read(&netlink_sock_nr));
|
#endif
|
#endif
|
}
|
}
|
|
|
/* This lock without WQ_FLAG_EXCLUSIVE is good on UP and it is _very_ bad on SMP.
|
/* This lock without WQ_FLAG_EXCLUSIVE is good on UP and it is _very_ bad on SMP.
|
* Look, when several writers sleep and reader wakes them up, all but one
|
* Look, when several writers sleep and reader wakes them up, all but one
|
* immediately hit write lock and grab all the cpus. Exclusive sleep solves
|
* immediately hit write lock and grab all the cpus. Exclusive sleep solves
|
* this, _but_ remember, it adds useless work on UP machines.
|
* this, _but_ remember, it adds useless work on UP machines.
|
*/
|
*/
|
|
|
static void netlink_table_grab(void)
|
static void netlink_table_grab(void)
|
{
|
{
|
write_lock_bh(&nl_table_lock);
|
write_lock_bh(&nl_table_lock);
|
|
|
if (atomic_read(&nl_table_users)) {
|
if (atomic_read(&nl_table_users)) {
|
DECLARE_WAITQUEUE(wait, current);
|
DECLARE_WAITQUEUE(wait, current);
|
|
|
add_wait_queue_exclusive(&nl_table_wait, &wait);
|
add_wait_queue_exclusive(&nl_table_wait, &wait);
|
for(;;) {
|
for(;;) {
|
set_current_state(TASK_UNINTERRUPTIBLE);
|
set_current_state(TASK_UNINTERRUPTIBLE);
|
if (atomic_read(&nl_table_users) == 0)
|
if (atomic_read(&nl_table_users) == 0)
|
break;
|
break;
|
write_unlock_bh(&nl_table_lock);
|
write_unlock_bh(&nl_table_lock);
|
schedule();
|
schedule();
|
write_lock_bh(&nl_table_lock);
|
write_lock_bh(&nl_table_lock);
|
}
|
}
|
|
|
__set_current_state(TASK_RUNNING);
|
__set_current_state(TASK_RUNNING);
|
remove_wait_queue(&nl_table_wait, &wait);
|
remove_wait_queue(&nl_table_wait, &wait);
|
}
|
}
|
}
|
}
|
|
|
static __inline__ void netlink_table_ungrab(void)
|
static __inline__ void netlink_table_ungrab(void)
|
{
|
{
|
write_unlock_bh(&nl_table_lock);
|
write_unlock_bh(&nl_table_lock);
|
wake_up(&nl_table_wait);
|
wake_up(&nl_table_wait);
|
}
|
}
|
|
|
static __inline__ void
|
static __inline__ void
|
netlink_lock_table(void)
|
netlink_lock_table(void)
|
{
|
{
|
/* read_lock() synchronizes us to netlink_table_grab */
|
/* read_lock() synchronizes us to netlink_table_grab */
|
|
|
read_lock(&nl_table_lock);
|
read_lock(&nl_table_lock);
|
atomic_inc(&nl_table_users);
|
atomic_inc(&nl_table_users);
|
read_unlock(&nl_table_lock);
|
read_unlock(&nl_table_lock);
|
}
|
}
|
|
|
static __inline__ void
|
static __inline__ void
|
netlink_unlock_table(void)
|
netlink_unlock_table(void)
|
{
|
{
|
if (atomic_dec_and_test(&nl_table_users))
|
if (atomic_dec_and_test(&nl_table_users))
|
wake_up(&nl_table_wait);
|
wake_up(&nl_table_wait);
|
}
|
}
|
|
|
static __inline__ struct sock *netlink_lookup(int protocol, u32 pid)
|
static __inline__ struct sock *netlink_lookup(int protocol, u32 pid)
|
{
|
{
|
struct sock *sk;
|
struct sock *sk;
|
|
|
read_lock(&nl_table_lock);
|
read_lock(&nl_table_lock);
|
for (sk=nl_table[protocol]; sk; sk=sk->next) {
|
for (sk=nl_table[protocol]; sk; sk=sk->next) {
|
if (sk->protinfo.af_netlink->pid == pid) {
|
if (sk->protinfo.af_netlink->pid == pid) {
|
sock_hold(sk);
|
sock_hold(sk);
|
read_unlock(&nl_table_lock);
|
read_unlock(&nl_table_lock);
|
return sk;
|
return sk;
|
}
|
}
|
}
|
}
|
|
|
read_unlock(&nl_table_lock);
|
read_unlock(&nl_table_lock);
|
return NULL;
|
return NULL;
|
}
|
}
|
|
|
extern struct proto_ops netlink_ops;
|
extern struct proto_ops netlink_ops;
|
|
|
static int netlink_insert(struct sock *sk, u32 pid)
|
static int netlink_insert(struct sock *sk, u32 pid)
|
{
|
{
|
int err = -EADDRINUSE;
|
int err = -EADDRINUSE;
|
struct sock *osk;
|
struct sock *osk;
|
|
|
netlink_table_grab();
|
netlink_table_grab();
|
for (osk=nl_table[sk->protocol]; osk; osk=osk->next) {
|
for (osk=nl_table[sk->protocol]; osk; osk=osk->next) {
|
if (osk->protinfo.af_netlink->pid == pid)
|
if (osk->protinfo.af_netlink->pid == pid)
|
break;
|
break;
|
}
|
}
|
if (osk == NULL) {
|
if (osk == NULL) {
|
err = -EBUSY;
|
err = -EBUSY;
|
if (sk->protinfo.af_netlink->pid == 0) {
|
if (sk->protinfo.af_netlink->pid == 0) {
|
sk->protinfo.af_netlink->pid = pid;
|
sk->protinfo.af_netlink->pid = pid;
|
sk->next = nl_table[sk->protocol];
|
sk->next = nl_table[sk->protocol];
|
nl_table[sk->protocol] = sk;
|
nl_table[sk->protocol] = sk;
|
sock_hold(sk);
|
sock_hold(sk);
|
err = 0;
|
err = 0;
|
}
|
}
|
}
|
}
|
netlink_table_ungrab();
|
netlink_table_ungrab();
|
return err;
|
return err;
|
}
|
}
|
|
|
static void netlink_remove(struct sock *sk)
|
static void netlink_remove(struct sock *sk)
|
{
|
{
|
struct sock **skp;
|
struct sock **skp;
|
|
|
netlink_table_grab();
|
netlink_table_grab();
|
for (skp = &nl_table[sk->protocol]; *skp; skp = &((*skp)->next)) {
|
for (skp = &nl_table[sk->protocol]; *skp; skp = &((*skp)->next)) {
|
if (*skp == sk) {
|
if (*skp == sk) {
|
*skp = sk->next;
|
*skp = sk->next;
|
__sock_put(sk);
|
__sock_put(sk);
|
break;
|
break;
|
}
|
}
|
}
|
}
|
netlink_table_ungrab();
|
netlink_table_ungrab();
|
}
|
}
|
|
|
static int netlink_create(struct socket *sock, int protocol)
|
static int netlink_create(struct socket *sock, int protocol)
|
{
|
{
|
struct sock *sk;
|
struct sock *sk;
|
|
|
sock->state = SS_UNCONNECTED;
|
sock->state = SS_UNCONNECTED;
|
|
|
if (sock->type != SOCK_RAW && sock->type != SOCK_DGRAM)
|
if (sock->type != SOCK_RAW && sock->type != SOCK_DGRAM)
|
return -ESOCKTNOSUPPORT;
|
return -ESOCKTNOSUPPORT;
|
|
|
if (protocol<0 || protocol >= MAX_LINKS)
|
if (protocol<0 || protocol >= MAX_LINKS)
|
return -EPROTONOSUPPORT;
|
return -EPROTONOSUPPORT;
|
|
|
sock->ops = &netlink_ops;
|
sock->ops = &netlink_ops;
|
|
|
sk = sk_alloc(PF_NETLINK, GFP_KERNEL, 1);
|
sk = sk_alloc(PF_NETLINK, GFP_KERNEL, 1);
|
if (!sk)
|
if (!sk)
|
return -ENOMEM;
|
return -ENOMEM;
|
|
|
sock_init_data(sock,sk);
|
sock_init_data(sock,sk);
|
|
|
sk->protinfo.af_netlink = kmalloc(sizeof(struct netlink_opt), GFP_KERNEL);
|
sk->protinfo.af_netlink = kmalloc(sizeof(struct netlink_opt), GFP_KERNEL);
|
if (sk->protinfo.af_netlink == NULL) {
|
if (sk->protinfo.af_netlink == NULL) {
|
sk_free(sk);
|
sk_free(sk);
|
return -ENOMEM;
|
return -ENOMEM;
|
}
|
}
|
memset(sk->protinfo.af_netlink, 0, sizeof(struct netlink_opt));
|
memset(sk->protinfo.af_netlink, 0, sizeof(struct netlink_opt));
|
|
|
spin_lock_init(&sk->protinfo.af_netlink->cb_lock);
|
spin_lock_init(&sk->protinfo.af_netlink->cb_lock);
|
init_waitqueue_head(&sk->protinfo.af_netlink->wait);
|
init_waitqueue_head(&sk->protinfo.af_netlink->wait);
|
sk->destruct = netlink_sock_destruct;
|
sk->destruct = netlink_sock_destruct;
|
atomic_inc(&netlink_sock_nr);
|
atomic_inc(&netlink_sock_nr);
|
|
|
sk->protocol=protocol;
|
sk->protocol=protocol;
|
return 0;
|
return 0;
|
}
|
}
|
|
|
static int netlink_release(struct socket *sock)
|
static int netlink_release(struct socket *sock)
|
{
|
{
|
struct sock *sk = sock->sk;
|
struct sock *sk = sock->sk;
|
|
|
if (!sk)
|
if (!sk)
|
return 0;
|
return 0;
|
|
|
netlink_remove(sk);
|
netlink_remove(sk);
|
|
|
spin_lock(&sk->protinfo.af_netlink->cb_lock);
|
spin_lock(&sk->protinfo.af_netlink->cb_lock);
|
if (sk->protinfo.af_netlink->cb) {
|
if (sk->protinfo.af_netlink->cb) {
|
sk->protinfo.af_netlink->cb->done(sk->protinfo.af_netlink->cb);
|
sk->protinfo.af_netlink->cb->done(sk->protinfo.af_netlink->cb);
|
netlink_destroy_callback(sk->protinfo.af_netlink->cb);
|
netlink_destroy_callback(sk->protinfo.af_netlink->cb);
|
sk->protinfo.af_netlink->cb = NULL;
|
sk->protinfo.af_netlink->cb = NULL;
|
__sock_put(sk);
|
__sock_put(sk);
|
}
|
}
|
spin_unlock(&sk->protinfo.af_netlink->cb_lock);
|
spin_unlock(&sk->protinfo.af_netlink->cb_lock);
|
|
|
/* OK. Socket is unlinked, and, therefore,
|
/* OK. Socket is unlinked, and, therefore,
|
no new packets will arrive */
|
no new packets will arrive */
|
|
|
sock_orphan(sk);
|
sock_orphan(sk);
|
sock->sk = NULL;
|
sock->sk = NULL;
|
wake_up_interruptible_all(&sk->protinfo.af_netlink->wait);
|
wake_up_interruptible_all(&sk->protinfo.af_netlink->wait);
|
|
|
skb_queue_purge(&sk->write_queue);
|
skb_queue_purge(&sk->write_queue);
|
|
|
if (sk->protinfo.af_netlink->pid && !sk->protinfo.af_netlink->groups) {
|
if (sk->protinfo.af_netlink->pid && !sk->protinfo.af_netlink->groups) {
|
struct netlink_notify n = { protocol:sk->protocol,
|
struct netlink_notify n = { protocol:sk->protocol,
|
pid:sk->protinfo.af_netlink->pid };
|
pid:sk->protinfo.af_netlink->pid };
|
notifier_call_chain(&netlink_chain, NETLINK_URELEASE, &n);
|
notifier_call_chain(&netlink_chain, NETLINK_URELEASE, &n);
|
}
|
}
|
|
|
sock_put(sk);
|
sock_put(sk);
|
return 0;
|
return 0;
|
}
|
}
|
|
|
static int netlink_autobind(struct socket *sock)
|
static int netlink_autobind(struct socket *sock)
|
{
|
{
|
struct sock *sk = sock->sk;
|
struct sock *sk = sock->sk;
|
struct sock *osk;
|
struct sock *osk;
|
s32 pid = current->pid;
|
s32 pid = current->pid;
|
int err;
|
int err;
|
|
|
retry:
|
retry:
|
netlink_table_grab();
|
netlink_table_grab();
|
for (osk=nl_table[sk->protocol]; osk; osk=osk->next) {
|
for (osk=nl_table[sk->protocol]; osk; osk=osk->next) {
|
if (osk->protinfo.af_netlink->pid == pid) {
|
if (osk->protinfo.af_netlink->pid == pid) {
|
/* Bind collision, search negative pid values. */
|
/* Bind collision, search negative pid values. */
|
if (pid > 0)
|
if (pid > 0)
|
pid = -4096;
|
pid = -4096;
|
pid--;
|
pid--;
|
netlink_table_ungrab();
|
netlink_table_ungrab();
|
goto retry;
|
goto retry;
|
}
|
}
|
}
|
}
|
netlink_table_ungrab();
|
netlink_table_ungrab();
|
|
|
err = netlink_insert(sk, pid);
|
err = netlink_insert(sk, pid);
|
if (err == -EADDRINUSE)
|
if (err == -EADDRINUSE)
|
goto retry;
|
goto retry;
|
sk->protinfo.af_netlink->groups = 0;
|
sk->protinfo.af_netlink->groups = 0;
|
return 0;
|
return 0;
|
}
|
}
|
|
|
static inline int netlink_capable(struct socket *sock, unsigned flag)
|
static inline int netlink_capable(struct socket *sock, unsigned flag)
|
{
|
{
|
return (nl_nonroot[sock->sk->protocol] & flag) || capable(CAP_NET_ADMIN);
|
return (nl_nonroot[sock->sk->protocol] & flag) || capable(CAP_NET_ADMIN);
|
}
|
}
|
|
|
static int netlink_bind(struct socket *sock, struct sockaddr *addr, int addr_len)
|
static int netlink_bind(struct socket *sock, struct sockaddr *addr, int addr_len)
|
{
|
{
|
struct sock *sk = sock->sk;
|
struct sock *sk = sock->sk;
|
int err;
|
int err;
|
struct sockaddr_nl *nladdr=(struct sockaddr_nl *)addr;
|
struct sockaddr_nl *nladdr=(struct sockaddr_nl *)addr;
|
|
|
if (nladdr->nl_family != AF_NETLINK)
|
if (nladdr->nl_family != AF_NETLINK)
|
return -EINVAL;
|
return -EINVAL;
|
|
|
/* Only superuser is allowed to listen multicasts */
|
/* Only superuser is allowed to listen multicasts */
|
if (nladdr->nl_groups && !netlink_capable(sock, NL_NONROOT_RECV))
|
if (nladdr->nl_groups && !netlink_capable(sock, NL_NONROOT_RECV))
|
return -EPERM;
|
return -EPERM;
|
|
|
if (sk->protinfo.af_netlink->pid) {
|
if (sk->protinfo.af_netlink->pid) {
|
if (nladdr->nl_pid != sk->protinfo.af_netlink->pid)
|
if (nladdr->nl_pid != sk->protinfo.af_netlink->pid)
|
return -EINVAL;
|
return -EINVAL;
|
sk->protinfo.af_netlink->groups = nladdr->nl_groups;
|
sk->protinfo.af_netlink->groups = nladdr->nl_groups;
|
return 0;
|
return 0;
|
}
|
}
|
|
|
if (nladdr->nl_pid == 0) {
|
if (nladdr->nl_pid == 0) {
|
err = netlink_autobind(sock);
|
err = netlink_autobind(sock);
|
if (err == 0)
|
if (err == 0)
|
sk->protinfo.af_netlink->groups = nladdr->nl_groups;
|
sk->protinfo.af_netlink->groups = nladdr->nl_groups;
|
return err;
|
return err;
|
}
|
}
|
|
|
err = netlink_insert(sk, nladdr->nl_pid);
|
err = netlink_insert(sk, nladdr->nl_pid);
|
if (err == 0)
|
if (err == 0)
|
sk->protinfo.af_netlink->groups = nladdr->nl_groups;
|
sk->protinfo.af_netlink->groups = nladdr->nl_groups;
|
return err;
|
return err;
|
}
|
}
|
|
|
static int netlink_connect(struct socket *sock, struct sockaddr *addr,
|
static int netlink_connect(struct socket *sock, struct sockaddr *addr,
|
int alen, int flags)
|
int alen, int flags)
|
{
|
{
|
int err = 0;
|
int err = 0;
|
struct sock *sk = sock->sk;
|
struct sock *sk = sock->sk;
|
struct sockaddr_nl *nladdr=(struct sockaddr_nl*)addr;
|
struct sockaddr_nl *nladdr=(struct sockaddr_nl*)addr;
|
|
|
if (addr->sa_family == AF_UNSPEC) {
|
if (addr->sa_family == AF_UNSPEC) {
|
sk->protinfo.af_netlink->dst_pid = 0;
|
sk->protinfo.af_netlink->dst_pid = 0;
|
sk->protinfo.af_netlink->dst_groups = 0;
|
sk->protinfo.af_netlink->dst_groups = 0;
|
return 0;
|
return 0;
|
}
|
}
|
if (addr->sa_family != AF_NETLINK)
|
if (addr->sa_family != AF_NETLINK)
|
return -EINVAL;
|
return -EINVAL;
|
|
|
/* Only superuser is allowed to send multicasts */
|
/* Only superuser is allowed to send multicasts */
|
if (nladdr->nl_groups && !netlink_capable(sock, NL_NONROOT_SEND))
|
if (nladdr->nl_groups && !netlink_capable(sock, NL_NONROOT_SEND))
|
return -EPERM;
|
return -EPERM;
|
|
|
if (!sk->protinfo.af_netlink->pid)
|
if (!sk->protinfo.af_netlink->pid)
|
err = netlink_autobind(sock);
|
err = netlink_autobind(sock);
|
|
|
if (err == 0) {
|
if (err == 0) {
|
sk->protinfo.af_netlink->dst_pid = nladdr->nl_pid;
|
sk->protinfo.af_netlink->dst_pid = nladdr->nl_pid;
|
sk->protinfo.af_netlink->dst_groups = nladdr->nl_groups;
|
sk->protinfo.af_netlink->dst_groups = nladdr->nl_groups;
|
}
|
}
|
|
|
return 0;
|
return 0;
|
}
|
}
|
|
|
static int netlink_getname(struct socket *sock, struct sockaddr *addr, int *addr_len, int peer)
|
static int netlink_getname(struct socket *sock, struct sockaddr *addr, int *addr_len, int peer)
|
{
|
{
|
struct sock *sk = sock->sk;
|
struct sock *sk = sock->sk;
|
struct sockaddr_nl *nladdr=(struct sockaddr_nl *)addr;
|
struct sockaddr_nl *nladdr=(struct sockaddr_nl *)addr;
|
|
|
nladdr->nl_family = AF_NETLINK;
|
nladdr->nl_family = AF_NETLINK;
|
nladdr->nl_pad = 0;
|
nladdr->nl_pad = 0;
|
*addr_len = sizeof(*nladdr);
|
*addr_len = sizeof(*nladdr);
|
|
|
if (peer) {
|
if (peer) {
|
nladdr->nl_pid = sk->protinfo.af_netlink->dst_pid;
|
nladdr->nl_pid = sk->protinfo.af_netlink->dst_pid;
|
nladdr->nl_groups = sk->protinfo.af_netlink->dst_groups;
|
nladdr->nl_groups = sk->protinfo.af_netlink->dst_groups;
|
} else {
|
} else {
|
nladdr->nl_pid = sk->protinfo.af_netlink->pid;
|
nladdr->nl_pid = sk->protinfo.af_netlink->pid;
|
nladdr->nl_groups = sk->protinfo.af_netlink->groups;
|
nladdr->nl_groups = sk->protinfo.af_netlink->groups;
|
}
|
}
|
return 0;
|
return 0;
|
}
|
}
|
|
|
static void netlink_overrun(struct sock *sk)
|
static void netlink_overrun(struct sock *sk)
|
{
|
{
|
if (!test_and_set_bit(0, &sk->protinfo.af_netlink->state)) {
|
if (!test_and_set_bit(0, &sk->protinfo.af_netlink->state)) {
|
sk->err = ENOBUFS;
|
sk->err = ENOBUFS;
|
sk->error_report(sk);
|
sk->error_report(sk);
|
}
|
}
|
}
|
}
|
|
|
int netlink_unicast(struct sock *ssk, struct sk_buff *skb, u32 pid, int nonblock)
|
int netlink_unicast(struct sock *ssk, struct sk_buff *skb, u32 pid, int nonblock)
|
{
|
{
|
struct sock *sk;
|
struct sock *sk;
|
int len = skb->len;
|
int len = skb->len;
|
int protocol = ssk->protocol;
|
int protocol = ssk->protocol;
|
long timeo;
|
long timeo;
|
DECLARE_WAITQUEUE(wait, current);
|
DECLARE_WAITQUEUE(wait, current);
|
|
|
timeo = sock_sndtimeo(ssk, nonblock);
|
timeo = sock_sndtimeo(ssk, nonblock);
|
|
|
retry:
|
retry:
|
sk = netlink_lookup(protocol, pid);
|
sk = netlink_lookup(protocol, pid);
|
if (sk == NULL)
|
if (sk == NULL)
|
goto no_dst;
|
goto no_dst;
|
|
|
/* Don't bother queuing skb if kernel socket has no input function */
|
/* Don't bother queuing skb if kernel socket has no input function */
|
if (sk->protinfo.af_netlink->pid == 0 &&
|
if (sk->protinfo.af_netlink->pid == 0 &&
|
!sk->protinfo.af_netlink->data_ready)
|
!sk->protinfo.af_netlink->data_ready)
|
goto no_dst;
|
goto no_dst;
|
|
|
#ifdef NL_EMULATE_DEV
|
#ifdef NL_EMULATE_DEV
|
if (sk->protinfo.af_netlink->handler) {
|
if (sk->protinfo.af_netlink->handler) {
|
skb_orphan(skb);
|
skb_orphan(skb);
|
len = sk->protinfo.af_netlink->handler(protocol, skb);
|
len = sk->protinfo.af_netlink->handler(protocol, skb);
|
sock_put(sk);
|
sock_put(sk);
|
return len;
|
return len;
|
}
|
}
|
#endif
|
#endif
|
|
|
if (atomic_read(&sk->rmem_alloc) > sk->rcvbuf ||
|
if (atomic_read(&sk->rmem_alloc) > sk->rcvbuf ||
|
test_bit(0, &sk->protinfo.af_netlink->state)) {
|
test_bit(0, &sk->protinfo.af_netlink->state)) {
|
if (!timeo) {
|
if (!timeo) {
|
if (ssk->protinfo.af_netlink->pid == 0)
|
if (ssk->protinfo.af_netlink->pid == 0)
|
netlink_overrun(sk);
|
netlink_overrun(sk);
|
sock_put(sk);
|
sock_put(sk);
|
kfree_skb(skb);
|
kfree_skb(skb);
|
return -EAGAIN;
|
return -EAGAIN;
|
}
|
}
|
|
|
__set_current_state(TASK_INTERRUPTIBLE);
|
__set_current_state(TASK_INTERRUPTIBLE);
|
add_wait_queue(&sk->protinfo.af_netlink->wait, &wait);
|
add_wait_queue(&sk->protinfo.af_netlink->wait, &wait);
|
|
|
if ((atomic_read(&sk->rmem_alloc) > sk->rcvbuf ||
|
if ((atomic_read(&sk->rmem_alloc) > sk->rcvbuf ||
|
test_bit(0, &sk->protinfo.af_netlink->state)) &&
|
test_bit(0, &sk->protinfo.af_netlink->state)) &&
|
!sk->dead)
|
!sk->dead)
|
timeo = schedule_timeout(timeo);
|
timeo = schedule_timeout(timeo);
|
|
|
__set_current_state(TASK_RUNNING);
|
__set_current_state(TASK_RUNNING);
|
remove_wait_queue(&sk->protinfo.af_netlink->wait, &wait);
|
remove_wait_queue(&sk->protinfo.af_netlink->wait, &wait);
|
sock_put(sk);
|
sock_put(sk);
|
|
|
if (signal_pending(current)) {
|
if (signal_pending(current)) {
|
kfree_skb(skb);
|
kfree_skb(skb);
|
return sock_intr_errno(timeo);
|
return sock_intr_errno(timeo);
|
}
|
}
|
goto retry;
|
goto retry;
|
}
|
}
|
|
|
skb_orphan(skb);
|
skb_orphan(skb);
|
skb_set_owner_r(skb, sk);
|
skb_set_owner_r(skb, sk);
|
skb_queue_tail(&sk->receive_queue, skb);
|
skb_queue_tail(&sk->receive_queue, skb);
|
sk->data_ready(sk, len);
|
sk->data_ready(sk, len);
|
sock_put(sk);
|
sock_put(sk);
|
return len;
|
return len;
|
|
|
no_dst:
|
no_dst:
|
kfree_skb(skb);
|
kfree_skb(skb);
|
return -ECONNREFUSED;
|
return -ECONNREFUSED;
|
}
|
}
|
|
|
static __inline__ int netlink_broadcast_deliver(struct sock *sk, struct sk_buff *skb)
|
static __inline__ int netlink_broadcast_deliver(struct sock *sk, struct sk_buff *skb)
|
{
|
{
|
#ifdef NL_EMULATE_DEV
|
#ifdef NL_EMULATE_DEV
|
if (sk->protinfo.af_netlink->handler) {
|
if (sk->protinfo.af_netlink->handler) {
|
skb_orphan(skb);
|
skb_orphan(skb);
|
sk->protinfo.af_netlink->handler(sk->protocol, skb);
|
sk->protinfo.af_netlink->handler(sk->protocol, skb);
|
return 0;
|
return 0;
|
} else
|
} else
|
#endif
|
#endif
|
if (atomic_read(&sk->rmem_alloc) <= sk->rcvbuf &&
|
if (atomic_read(&sk->rmem_alloc) <= sk->rcvbuf &&
|
!test_bit(0, &sk->protinfo.af_netlink->state)) {
|
!test_bit(0, &sk->protinfo.af_netlink->state)) {
|
skb_orphan(skb);
|
skb_orphan(skb);
|
skb_set_owner_r(skb, sk);
|
skb_set_owner_r(skb, sk);
|
skb_queue_tail(&sk->receive_queue, skb);
|
skb_queue_tail(&sk->receive_queue, skb);
|
sk->data_ready(sk, skb->len);
|
sk->data_ready(sk, skb->len);
|
return 0;
|
return 0;
|
}
|
}
|
return -1;
|
return -1;
|
}
|
}
|
|
|
void netlink_broadcast(struct sock *ssk, struct sk_buff *skb, u32 pid,
|
void netlink_broadcast(struct sock *ssk, struct sk_buff *skb, u32 pid,
|
u32 group, int allocation)
|
u32 group, int allocation)
|
{
|
{
|
struct sock *sk;
|
struct sock *sk;
|
struct sk_buff *skb2 = NULL;
|
struct sk_buff *skb2 = NULL;
|
int protocol = ssk->protocol;
|
int protocol = ssk->protocol;
|
int failure = 0;
|
int failure = 0;
|
|
|
/* While we sleep in clone, do not allow to change socket list */
|
/* While we sleep in clone, do not allow to change socket list */
|
|
|
netlink_lock_table();
|
netlink_lock_table();
|
|
|
for (sk = nl_table[protocol]; sk; sk = sk->next) {
|
for (sk = nl_table[protocol]; sk; sk = sk->next) {
|
if (ssk == sk)
|
if (ssk == sk)
|
continue;
|
continue;
|
|
|
if (sk->protinfo.af_netlink->pid == pid ||
|
if (sk->protinfo.af_netlink->pid == pid ||
|
!(sk->protinfo.af_netlink->groups&group))
|
!(sk->protinfo.af_netlink->groups&group))
|
continue;
|
continue;
|
|
|
if (failure) {
|
if (failure) {
|
netlink_overrun(sk);
|
netlink_overrun(sk);
|
continue;
|
continue;
|
}
|
}
|
|
|
sock_hold(sk);
|
sock_hold(sk);
|
if (skb2 == NULL) {
|
if (skb2 == NULL) {
|
if (atomic_read(&skb->users) != 1) {
|
if (atomic_read(&skb->users) != 1) {
|
skb2 = skb_clone(skb, allocation);
|
skb2 = skb_clone(skb, allocation);
|
} else {
|
} else {
|
skb2 = skb;
|
skb2 = skb;
|
atomic_inc(&skb->users);
|
atomic_inc(&skb->users);
|
}
|
}
|
}
|
}
|
if (skb2 == NULL) {
|
if (skb2 == NULL) {
|
netlink_overrun(sk);
|
netlink_overrun(sk);
|
/* Clone failed. Notify ALL listeners. */
|
/* Clone failed. Notify ALL listeners. */
|
failure = 1;
|
failure = 1;
|
} else if (netlink_broadcast_deliver(sk, skb2)) {
|
} else if (netlink_broadcast_deliver(sk, skb2)) {
|
netlink_overrun(sk);
|
netlink_overrun(sk);
|
} else
|
} else
|
skb2 = NULL;
|
skb2 = NULL;
|
sock_put(sk);
|
sock_put(sk);
|
}
|
}
|
|
|
netlink_unlock_table();
|
netlink_unlock_table();
|
|
|
if (skb2)
|
if (skb2)
|
kfree_skb(skb2);
|
kfree_skb(skb2);
|
kfree_skb(skb);
|
kfree_skb(skb);
|
}
|
}
|
|
|
void netlink_set_err(struct sock *ssk, u32 pid, u32 group, int code)
|
void netlink_set_err(struct sock *ssk, u32 pid, u32 group, int code)
|
{
|
{
|
struct sock *sk;
|
struct sock *sk;
|
int protocol = ssk->protocol;
|
int protocol = ssk->protocol;
|
|
|
read_lock(&nl_table_lock);
|
read_lock(&nl_table_lock);
|
for (sk = nl_table[protocol]; sk; sk = sk->next) {
|
for (sk = nl_table[protocol]; sk; sk = sk->next) {
|
if (ssk == sk)
|
if (ssk == sk)
|
continue;
|
continue;
|
|
|
if (sk->protinfo.af_netlink->pid == pid ||
|
if (sk->protinfo.af_netlink->pid == pid ||
|
!(sk->protinfo.af_netlink->groups&group))
|
!(sk->protinfo.af_netlink->groups&group))
|
continue;
|
continue;
|
|
|
sk->err = code;
|
sk->err = code;
|
sk->error_report(sk);
|
sk->error_report(sk);
|
}
|
}
|
read_unlock(&nl_table_lock);
|
read_unlock(&nl_table_lock);
|
}
|
}
|
|
|
static inline void netlink_rcv_wake(struct sock *sk)
|
static inline void netlink_rcv_wake(struct sock *sk)
|
{
|
{
|
if (skb_queue_len(&sk->receive_queue) == 0)
|
if (skb_queue_len(&sk->receive_queue) == 0)
|
clear_bit(0, &sk->protinfo.af_netlink->state);
|
clear_bit(0, &sk->protinfo.af_netlink->state);
|
if (!test_bit(0, &sk->protinfo.af_netlink->state))
|
if (!test_bit(0, &sk->protinfo.af_netlink->state))
|
wake_up_interruptible(&sk->protinfo.af_netlink->wait);
|
wake_up_interruptible(&sk->protinfo.af_netlink->wait);
|
}
|
}
|
|
|
static int netlink_sendmsg(struct socket *sock, struct msghdr *msg, int len,
|
static int netlink_sendmsg(struct socket *sock, struct msghdr *msg, int len,
|
struct scm_cookie *scm)
|
struct scm_cookie *scm)
|
{
|
{
|
struct sock *sk = sock->sk;
|
struct sock *sk = sock->sk;
|
struct sockaddr_nl *addr=msg->msg_name;
|
struct sockaddr_nl *addr=msg->msg_name;
|
u32 dst_pid;
|
u32 dst_pid;
|
u32 dst_groups;
|
u32 dst_groups;
|
struct sk_buff *skb;
|
struct sk_buff *skb;
|
int err;
|
int err;
|
|
|
if (msg->msg_flags&MSG_OOB)
|
if (msg->msg_flags&MSG_OOB)
|
return -EOPNOTSUPP;
|
return -EOPNOTSUPP;
|
|
|
if (msg->msg_namelen) {
|
if (msg->msg_namelen) {
|
if (addr->nl_family != AF_NETLINK)
|
if (addr->nl_family != AF_NETLINK)
|
return -EINVAL;
|
return -EINVAL;
|
dst_pid = addr->nl_pid;
|
dst_pid = addr->nl_pid;
|
dst_groups = addr->nl_groups;
|
dst_groups = addr->nl_groups;
|
if (dst_groups && !netlink_capable(sock, NL_NONROOT_SEND))
|
if (dst_groups && !netlink_capable(sock, NL_NONROOT_SEND))
|
return -EPERM;
|
return -EPERM;
|
} else {
|
} else {
|
dst_pid = sk->protinfo.af_netlink->dst_pid;
|
dst_pid = sk->protinfo.af_netlink->dst_pid;
|
dst_groups = sk->protinfo.af_netlink->dst_groups;
|
dst_groups = sk->protinfo.af_netlink->dst_groups;
|
}
|
}
|
|
|
if (!sk->protinfo.af_netlink->pid) {
|
if (!sk->protinfo.af_netlink->pid) {
|
err = netlink_autobind(sock);
|
err = netlink_autobind(sock);
|
if (err)
|
if (err)
|
goto out;
|
goto out;
|
}
|
}
|
|
|
err = -EMSGSIZE;
|
err = -EMSGSIZE;
|
if ((unsigned)len > sk->sndbuf-32)
|
if ((unsigned)len > sk->sndbuf-32)
|
goto out;
|
goto out;
|
err = -ENOBUFS;
|
err = -ENOBUFS;
|
skb = alloc_skb(len, GFP_KERNEL);
|
skb = alloc_skb(len, GFP_KERNEL);
|
if (skb==NULL)
|
if (skb==NULL)
|
goto out;
|
goto out;
|
|
|
NETLINK_CB(skb).pid = sk->protinfo.af_netlink->pid;
|
NETLINK_CB(skb).pid = sk->protinfo.af_netlink->pid;
|
NETLINK_CB(skb).groups = sk->protinfo.af_netlink->groups;
|
NETLINK_CB(skb).groups = sk->protinfo.af_netlink->groups;
|
NETLINK_CB(skb).dst_pid = dst_pid;
|
NETLINK_CB(skb).dst_pid = dst_pid;
|
NETLINK_CB(skb).dst_groups = dst_groups;
|
NETLINK_CB(skb).dst_groups = dst_groups;
|
memcpy(NETLINK_CREDS(skb), &scm->creds, sizeof(struct ucred));
|
memcpy(NETLINK_CREDS(skb), &scm->creds, sizeof(struct ucred));
|
|
|
/* What can I do? Netlink is asynchronous, so that
|
/* What can I do? Netlink is asynchronous, so that
|
we will have to save current capabilities to
|
we will have to save current capabilities to
|
check them, when this message will be delivered
|
check them, when this message will be delivered
|
to corresponding kernel module. --ANK (980802)
|
to corresponding kernel module. --ANK (980802)
|
*/
|
*/
|
NETLINK_CB(skb).eff_cap = current->cap_effective;
|
NETLINK_CB(skb).eff_cap = current->cap_effective;
|
|
|
err = -EFAULT;
|
err = -EFAULT;
|
if (memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len)) {
|
if (memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len)) {
|
kfree_skb(skb);
|
kfree_skb(skb);
|
goto out;
|
goto out;
|
}
|
}
|
|
|
if (dst_groups) {
|
if (dst_groups) {
|
atomic_inc(&skb->users);
|
atomic_inc(&skb->users);
|
netlink_broadcast(sk, skb, dst_pid, dst_groups, GFP_KERNEL);
|
netlink_broadcast(sk, skb, dst_pid, dst_groups, GFP_KERNEL);
|
}
|
}
|
err = netlink_unicast(sk, skb, dst_pid, msg->msg_flags&MSG_DONTWAIT);
|
err = netlink_unicast(sk, skb, dst_pid, msg->msg_flags&MSG_DONTWAIT);
|
|
|
out:
|
out:
|
return err;
|
return err;
|
}
|
}
|
|
|
static int netlink_recvmsg(struct socket *sock, struct msghdr *msg, int len,
|
static int netlink_recvmsg(struct socket *sock, struct msghdr *msg, int len,
|
int flags, struct scm_cookie *scm)
|
int flags, struct scm_cookie *scm)
|
{
|
{
|
struct sock *sk = sock->sk;
|
struct sock *sk = sock->sk;
|
int noblock = flags&MSG_DONTWAIT;
|
int noblock = flags&MSG_DONTWAIT;
|
int copied;
|
int copied;
|
struct sk_buff *skb;
|
struct sk_buff *skb;
|
int err;
|
int err;
|
|
|
if (flags&MSG_OOB)
|
if (flags&MSG_OOB)
|
return -EOPNOTSUPP;
|
return -EOPNOTSUPP;
|
|
|
copied = 0;
|
copied = 0;
|
|
|
skb = skb_recv_datagram(sk,flags,noblock,&err);
|
skb = skb_recv_datagram(sk,flags,noblock,&err);
|
if (skb==NULL)
|
if (skb==NULL)
|
goto out;
|
goto out;
|
|
|
msg->msg_namelen = 0;
|
msg->msg_namelen = 0;
|
|
|
copied = skb->len;
|
copied = skb->len;
|
if (len < copied) {
|
if (len < copied) {
|
msg->msg_flags |= MSG_TRUNC;
|
msg->msg_flags |= MSG_TRUNC;
|
copied = len;
|
copied = len;
|
}
|
}
|
|
|
skb->h.raw = skb->data;
|
skb->h.raw = skb->data;
|
err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
|
err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
|
|
|
if (msg->msg_name) {
|
if (msg->msg_name) {
|
struct sockaddr_nl *addr = (struct sockaddr_nl*)msg->msg_name;
|
struct sockaddr_nl *addr = (struct sockaddr_nl*)msg->msg_name;
|
addr->nl_family = AF_NETLINK;
|
addr->nl_family = AF_NETLINK;
|
addr->nl_pad = 0;
|
addr->nl_pad = 0;
|
addr->nl_pid = NETLINK_CB(skb).pid;
|
addr->nl_pid = NETLINK_CB(skb).pid;
|
addr->nl_groups = NETLINK_CB(skb).dst_groups;
|
addr->nl_groups = NETLINK_CB(skb).dst_groups;
|
msg->msg_namelen = sizeof(*addr);
|
msg->msg_namelen = sizeof(*addr);
|
}
|
}
|
|
|
scm->creds = *NETLINK_CREDS(skb);
|
scm->creds = *NETLINK_CREDS(skb);
|
skb_free_datagram(sk, skb);
|
skb_free_datagram(sk, skb);
|
|
|
if (sk->protinfo.af_netlink->cb
|
if (sk->protinfo.af_netlink->cb
|
&& atomic_read(&sk->rmem_alloc) <= sk->rcvbuf/2)
|
&& atomic_read(&sk->rmem_alloc) <= sk->rcvbuf/2)
|
netlink_dump(sk);
|
netlink_dump(sk);
|
|
|
out:
|
out:
|
netlink_rcv_wake(sk);
|
netlink_rcv_wake(sk);
|
return err ? : copied;
|
return err ? : copied;
|
}
|
}
|
|
|
void netlink_data_ready(struct sock *sk, int len)
|
void netlink_data_ready(struct sock *sk, int len)
|
{
|
{
|
if (sk->protinfo.af_netlink->data_ready)
|
if (sk->protinfo.af_netlink->data_ready)
|
sk->protinfo.af_netlink->data_ready(sk, len);
|
sk->protinfo.af_netlink->data_ready(sk, len);
|
netlink_rcv_wake(sk);
|
netlink_rcv_wake(sk);
|
}
|
}
|
|
|
/*
|
/*
|
* We export these functions to other modules. They provide a
|
* We export these functions to other modules. They provide a
|
* complete set of kernel non-blocking support for message
|
* complete set of kernel non-blocking support for message
|
* queueing.
|
* queueing.
|
*/
|
*/
|
|
|
struct sock *
|
struct sock *
|
netlink_kernel_create(int unit, void (*input)(struct sock *sk, int len))
|
netlink_kernel_create(int unit, void (*input)(struct sock *sk, int len))
|
{
|
{
|
struct socket *sock;
|
struct socket *sock;
|
struct sock *sk;
|
struct sock *sk;
|
|
|
if (unit<0 || unit>=MAX_LINKS)
|
if (unit<0 || unit>=MAX_LINKS)
|
return NULL;
|
return NULL;
|
|
|
if (!(sock = sock_alloc()))
|
if (!(sock = sock_alloc()))
|
return NULL;
|
return NULL;
|
|
|
sock->type = SOCK_RAW;
|
sock->type = SOCK_RAW;
|
|
|
if (netlink_create(sock, unit) < 0) {
|
if (netlink_create(sock, unit) < 0) {
|
sock_release(sock);
|
sock_release(sock);
|
return NULL;
|
return NULL;
|
}
|
}
|
sk = sock->sk;
|
sk = sock->sk;
|
sk->data_ready = netlink_data_ready;
|
sk->data_ready = netlink_data_ready;
|
if (input)
|
if (input)
|
sk->protinfo.af_netlink->data_ready = input;
|
sk->protinfo.af_netlink->data_ready = input;
|
|
|
netlink_insert(sk, 0);
|
netlink_insert(sk, 0);
|
return sk;
|
return sk;
|
}
|
}
|
|
|
void netlink_set_nonroot(int protocol, unsigned flags)
|
void netlink_set_nonroot(int protocol, unsigned flags)
|
{
|
{
|
if ((unsigned)protocol < MAX_LINKS)
|
if ((unsigned)protocol < MAX_LINKS)
|
nl_nonroot[protocol] = flags;
|
nl_nonroot[protocol] = flags;
|
}
|
}
|
|
|
static void netlink_destroy_callback(struct netlink_callback *cb)
|
static void netlink_destroy_callback(struct netlink_callback *cb)
|
{
|
{
|
if (cb->skb)
|
if (cb->skb)
|
kfree_skb(cb->skb);
|
kfree_skb(cb->skb);
|
kfree(cb);
|
kfree(cb);
|
}
|
}
|
|
|
/*
|
/*
|
* It looks a bit ugly.
|
* It looks a bit ugly.
|
* It would be better to create kernel thread.
|
* It would be better to create kernel thread.
|
*/
|
*/
|
|
|
static int netlink_dump(struct sock *sk)
|
static int netlink_dump(struct sock *sk)
|
{
|
{
|
struct netlink_callback *cb;
|
struct netlink_callback *cb;
|
struct sk_buff *skb;
|
struct sk_buff *skb;
|
struct nlmsghdr *nlh;
|
struct nlmsghdr *nlh;
|
int len;
|
int len;
|
|
|
skb = sock_rmalloc(sk, NLMSG_GOODSIZE, 0, GFP_KERNEL);
|
skb = sock_rmalloc(sk, NLMSG_GOODSIZE, 0, GFP_KERNEL);
|
if (!skb)
|
if (!skb)
|
return -ENOBUFS;
|
return -ENOBUFS;
|
|
|
spin_lock(&sk->protinfo.af_netlink->cb_lock);
|
spin_lock(&sk->protinfo.af_netlink->cb_lock);
|
|
|
cb = sk->protinfo.af_netlink->cb;
|
cb = sk->protinfo.af_netlink->cb;
|
if (cb == NULL) {
|
if (cb == NULL) {
|
spin_unlock(&sk->protinfo.af_netlink->cb_lock);
|
spin_unlock(&sk->protinfo.af_netlink->cb_lock);
|
kfree_skb(skb);
|
kfree_skb(skb);
|
return -EINVAL;
|
return -EINVAL;
|
}
|
}
|
|
|
len = cb->dump(skb, cb);
|
len = cb->dump(skb, cb);
|
|
|
if (len > 0) {
|
if (len > 0) {
|
spin_unlock(&sk->protinfo.af_netlink->cb_lock);
|
spin_unlock(&sk->protinfo.af_netlink->cb_lock);
|
skb_queue_tail(&sk->receive_queue, skb);
|
skb_queue_tail(&sk->receive_queue, skb);
|
sk->data_ready(sk, len);
|
sk->data_ready(sk, len);
|
return 0;
|
return 0;
|
}
|
}
|
|
|
nlh = __nlmsg_put(skb, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq, NLMSG_DONE, sizeof(int));
|
nlh = __nlmsg_put(skb, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq, NLMSG_DONE, sizeof(int));
|
nlh->nlmsg_flags |= NLM_F_MULTI;
|
nlh->nlmsg_flags |= NLM_F_MULTI;
|
memcpy(NLMSG_DATA(nlh), &len, sizeof(len));
|
memcpy(NLMSG_DATA(nlh), &len, sizeof(len));
|
skb_queue_tail(&sk->receive_queue, skb);
|
skb_queue_tail(&sk->receive_queue, skb);
|
sk->data_ready(sk, skb->len);
|
sk->data_ready(sk, skb->len);
|
|
|
cb->done(cb);
|
cb->done(cb);
|
sk->protinfo.af_netlink->cb = NULL;
|
sk->protinfo.af_netlink->cb = NULL;
|
spin_unlock(&sk->protinfo.af_netlink->cb_lock);
|
spin_unlock(&sk->protinfo.af_netlink->cb_lock);
|
|
|
netlink_destroy_callback(cb);
|
netlink_destroy_callback(cb);
|
sock_put(sk);
|
sock_put(sk);
|
return 0;
|
return 0;
|
}
|
}
|
|
|
int netlink_dump_start(struct sock *ssk, struct sk_buff *skb,
|
int netlink_dump_start(struct sock *ssk, struct sk_buff *skb,
|
struct nlmsghdr *nlh,
|
struct nlmsghdr *nlh,
|
int (*dump)(struct sk_buff *skb, struct netlink_callback*),
|
int (*dump)(struct sk_buff *skb, struct netlink_callback*),
|
int (*done)(struct netlink_callback*))
|
int (*done)(struct netlink_callback*))
|
{
|
{
|
struct netlink_callback *cb;
|
struct netlink_callback *cb;
|
struct sock *sk;
|
struct sock *sk;
|
|
|
cb = kmalloc(sizeof(*cb), GFP_KERNEL);
|
cb = kmalloc(sizeof(*cb), GFP_KERNEL);
|
if (cb == NULL)
|
if (cb == NULL)
|
return -ENOBUFS;
|
return -ENOBUFS;
|
|
|
memset(cb, 0, sizeof(*cb));
|
memset(cb, 0, sizeof(*cb));
|
cb->dump = dump;
|
cb->dump = dump;
|
cb->done = done;
|
cb->done = done;
|
cb->nlh = nlh;
|
cb->nlh = nlh;
|
atomic_inc(&skb->users);
|
atomic_inc(&skb->users);
|
cb->skb = skb;
|
cb->skb = skb;
|
|
|
sk = netlink_lookup(ssk->protocol, NETLINK_CB(skb).pid);
|
sk = netlink_lookup(ssk->protocol, NETLINK_CB(skb).pid);
|
if (sk == NULL) {
|
if (sk == NULL) {
|
netlink_destroy_callback(cb);
|
netlink_destroy_callback(cb);
|
return -ECONNREFUSED;
|
return -ECONNREFUSED;
|
}
|
}
|
/* A dump is in progress... */
|
/* A dump is in progress... */
|
spin_lock(&sk->protinfo.af_netlink->cb_lock);
|
spin_lock(&sk->protinfo.af_netlink->cb_lock);
|
if (sk->protinfo.af_netlink->cb) {
|
if (sk->protinfo.af_netlink->cb) {
|
spin_unlock(&sk->protinfo.af_netlink->cb_lock);
|
spin_unlock(&sk->protinfo.af_netlink->cb_lock);
|
netlink_destroy_callback(cb);
|
netlink_destroy_callback(cb);
|
sock_put(sk);
|
sock_put(sk);
|
return -EBUSY;
|
return -EBUSY;
|
}
|
}
|
sk->protinfo.af_netlink->cb = cb;
|
sk->protinfo.af_netlink->cb = cb;
|
spin_unlock(&sk->protinfo.af_netlink->cb_lock);
|
spin_unlock(&sk->protinfo.af_netlink->cb_lock);
|
|
|
netlink_dump(sk);
|
netlink_dump(sk);
|
return 0;
|
return 0;
|
}
|
}
|
|
|
void netlink_ack(struct sk_buff *in_skb, struct nlmsghdr *nlh, int err)
|
void netlink_ack(struct sk_buff *in_skb, struct nlmsghdr *nlh, int err)
|
{
|
{
|
struct sk_buff *skb;
|
struct sk_buff *skb;
|
struct nlmsghdr *rep;
|
struct nlmsghdr *rep;
|
struct nlmsgerr *errmsg;
|
struct nlmsgerr *errmsg;
|
int size;
|
int size;
|
|
|
if (err == 0)
|
if (err == 0)
|
size = NLMSG_SPACE(sizeof(struct nlmsgerr));
|
size = NLMSG_SPACE(sizeof(struct nlmsgerr));
|
else
|
else
|
size = NLMSG_SPACE(4 + NLMSG_ALIGN(nlh->nlmsg_len));
|
size = NLMSG_SPACE(4 + NLMSG_ALIGN(nlh->nlmsg_len));
|
|
|
skb = alloc_skb(size, GFP_KERNEL);
|
skb = alloc_skb(size, GFP_KERNEL);
|
if (!skb) {
|
if (!skb) {
|
struct sock *sk;
|
struct sock *sk;
|
|
|
sk = netlink_lookup(in_skb->sk->protocol,
|
sk = netlink_lookup(in_skb->sk->protocol,
|
NETLINK_CB(in_skb).pid);
|
NETLINK_CB(in_skb).pid);
|
if (sk) {
|
if (sk) {
|
sk->err = ENOBUFS;
|
sk->err = ENOBUFS;
|
sk->error_report(sk);
|
sk->error_report(sk);
|
sock_put(sk);
|
sock_put(sk);
|
}
|
}
|
}
|
}
|
|
|
rep = __nlmsg_put(skb, NETLINK_CB(in_skb).pid, nlh->nlmsg_seq,
|
rep = __nlmsg_put(skb, NETLINK_CB(in_skb).pid, nlh->nlmsg_seq,
|
NLMSG_ERROR, sizeof(struct nlmsgerr));
|
NLMSG_ERROR, sizeof(struct nlmsgerr));
|
errmsg = NLMSG_DATA(rep);
|
errmsg = NLMSG_DATA(rep);
|
errmsg->error = err;
|
errmsg->error = err;
|
memcpy(&errmsg->msg, nlh, err ? nlh->nlmsg_len : sizeof(struct nlmsghdr));
|
memcpy(&errmsg->msg, nlh, err ? nlh->nlmsg_len : sizeof(struct nlmsghdr));
|
netlink_unicast(in_skb->sk, skb, NETLINK_CB(in_skb).pid, MSG_DONTWAIT);
|
netlink_unicast(in_skb->sk, skb, NETLINK_CB(in_skb).pid, MSG_DONTWAIT);
|
}
|
}
|
|
|
|
|
#ifdef NL_EMULATE_DEV
|
#ifdef NL_EMULATE_DEV
|
|
|
static rwlock_t nl_emu_lock = RW_LOCK_UNLOCKED;
|
static rwlock_t nl_emu_lock = RW_LOCK_UNLOCKED;
|
|
|
/*
|
/*
|
* Backward compatibility.
|
* Backward compatibility.
|
*/
|
*/
|
|
|
int netlink_attach(int unit, int (*function)(int, struct sk_buff *skb))
|
int netlink_attach(int unit, int (*function)(int, struct sk_buff *skb))
|
{
|
{
|
struct sock *sk = netlink_kernel_create(unit, NULL);
|
struct sock *sk = netlink_kernel_create(unit, NULL);
|
if (sk == NULL)
|
if (sk == NULL)
|
return -ENOBUFS;
|
return -ENOBUFS;
|
sk->protinfo.af_netlink->handler = function;
|
sk->protinfo.af_netlink->handler = function;
|
write_lock_bh(&nl_emu_lock);
|
write_lock_bh(&nl_emu_lock);
|
netlink_kernel[unit] = sk->socket;
|
netlink_kernel[unit] = sk->socket;
|
write_unlock_bh(&nl_emu_lock);
|
write_unlock_bh(&nl_emu_lock);
|
return 0;
|
return 0;
|
}
|
}
|
|
|
void netlink_detach(int unit)
|
void netlink_detach(int unit)
|
{
|
{
|
struct socket *sock;
|
struct socket *sock;
|
|
|
write_lock_bh(&nl_emu_lock);
|
write_lock_bh(&nl_emu_lock);
|
sock = netlink_kernel[unit];
|
sock = netlink_kernel[unit];
|
netlink_kernel[unit] = NULL;
|
netlink_kernel[unit] = NULL;
|
write_unlock_bh(&nl_emu_lock);
|
write_unlock_bh(&nl_emu_lock);
|
|
|
sock_release(sock);
|
sock_release(sock);
|
}
|
}
|
|
|
int netlink_post(int unit, struct sk_buff *skb)
|
int netlink_post(int unit, struct sk_buff *skb)
|
{
|
{
|
struct socket *sock;
|
struct socket *sock;
|
|
|
read_lock(&nl_emu_lock);
|
read_lock(&nl_emu_lock);
|
sock = netlink_kernel[unit];
|
sock = netlink_kernel[unit];
|
if (sock) {
|
if (sock) {
|
struct sock *sk = sock->sk;
|
struct sock *sk = sock->sk;
|
memset(skb->cb, 0, sizeof(skb->cb));
|
memset(skb->cb, 0, sizeof(skb->cb));
|
sock_hold(sk);
|
sock_hold(sk);
|
read_unlock(&nl_emu_lock);
|
read_unlock(&nl_emu_lock);
|
|
|
netlink_broadcast(sk, skb, 0, ~0, GFP_ATOMIC);
|
netlink_broadcast(sk, skb, 0, ~0, GFP_ATOMIC);
|
|
|
sock_put(sk);
|
sock_put(sk);
|
return 0;
|
return 0;
|
}
|
}
|
read_unlock(&nl_emu_lock);
|
read_unlock(&nl_emu_lock);
|
return -EUNATCH;
|
return -EUNATCH;
|
}
|
}
|
|
|
#endif
|
#endif
|
|
|
|
|
#ifdef CONFIG_PROC_FS
|
#ifdef CONFIG_PROC_FS
|
static int netlink_read_proc(char *buffer, char **start, off_t offset,
|
static int netlink_read_proc(char *buffer, char **start, off_t offset,
|
int length, int *eof, void *data)
|
int length, int *eof, void *data)
|
{
|
{
|
off_t pos=0;
|
off_t pos=0;
|
off_t begin=0;
|
off_t begin=0;
|
int len=0;
|
int len=0;
|
int i;
|
int i;
|
struct sock *s;
|
struct sock *s;
|
|
|
len+= sprintf(buffer,"sk Eth Pid Groups "
|
len+= sprintf(buffer,"sk Eth Pid Groups "
|
"Rmem Wmem Dump Locks\n");
|
"Rmem Wmem Dump Locks\n");
|
|
|
for (i=0; i<MAX_LINKS; i++) {
|
for (i=0; i<MAX_LINKS; i++) {
|
read_lock(&nl_table_lock);
|
read_lock(&nl_table_lock);
|
for (s = nl_table[i]; s; s = s->next) {
|
for (s = nl_table[i]; s; s = s->next) {
|
len+=sprintf(buffer+len,"%p %-3d %-6d %08x %-8d %-8d %p %d",
|
len+=sprintf(buffer+len,"%p %-3d %-6d %08x %-8d %-8d %p %d",
|
s,
|
s,
|
s->protocol,
|
s->protocol,
|
s->protinfo.af_netlink->pid,
|
s->protinfo.af_netlink->pid,
|
s->protinfo.af_netlink->groups,
|
s->protinfo.af_netlink->groups,
|
atomic_read(&s->rmem_alloc),
|
atomic_read(&s->rmem_alloc),
|
atomic_read(&s->wmem_alloc),
|
atomic_read(&s->wmem_alloc),
|
s->protinfo.af_netlink->cb,
|
s->protinfo.af_netlink->cb,
|
atomic_read(&s->refcnt)
|
atomic_read(&s->refcnt)
|
);
|
);
|
|
|
buffer[len++]='\n';
|
buffer[len++]='\n';
|
|
|
pos=begin+len;
|
pos=begin+len;
|
if(pos<offset) {
|
if(pos<offset) {
|
len=0;
|
len=0;
|
begin=pos;
|
begin=pos;
|
}
|
}
|
if(pos>offset+length) {
|
if(pos>offset+length) {
|
read_unlock(&nl_table_lock);
|
read_unlock(&nl_table_lock);
|
goto done;
|
goto done;
|
}
|
}
|
}
|
}
|
read_unlock(&nl_table_lock);
|
read_unlock(&nl_table_lock);
|
}
|
}
|
*eof = 1;
|
*eof = 1;
|
|
|
done:
|
done:
|
*start=buffer+(offset-begin);
|
*start=buffer+(offset-begin);
|
len-=(offset-begin);
|
len-=(offset-begin);
|
if(len>length)
|
if(len>length)
|
len=length;
|
len=length;
|
if(len<0)
|
if(len<0)
|
len=0;
|
len=0;
|
return len;
|
return len;
|
}
|
}
|
#endif
|
#endif
|
|
|
int netlink_register_notifier(struct notifier_block *nb)
|
int netlink_register_notifier(struct notifier_block *nb)
|
{
|
{
|
return notifier_chain_register(&netlink_chain, nb);
|
return notifier_chain_register(&netlink_chain, nb);
|
}
|
}
|
|
|
int netlink_unregister_notifier(struct notifier_block *nb)
|
int netlink_unregister_notifier(struct notifier_block *nb)
|
{
|
{
|
return notifier_chain_unregister(&netlink_chain, nb);
|
return notifier_chain_unregister(&netlink_chain, nb);
|
}
|
}
|
|
|
struct proto_ops netlink_ops = {
|
struct proto_ops netlink_ops = {
|
family: PF_NETLINK,
|
family: PF_NETLINK,
|
|
|
release: netlink_release,
|
release: netlink_release,
|
bind: netlink_bind,
|
bind: netlink_bind,
|
connect: netlink_connect,
|
connect: netlink_connect,
|
socketpair: sock_no_socketpair,
|
socketpair: sock_no_socketpair,
|
accept: sock_no_accept,
|
accept: sock_no_accept,
|
getname: netlink_getname,
|
getname: netlink_getname,
|
poll: datagram_poll,
|
poll: datagram_poll,
|
ioctl: sock_no_ioctl,
|
ioctl: sock_no_ioctl,
|
listen: sock_no_listen,
|
listen: sock_no_listen,
|
shutdown: sock_no_shutdown,
|
shutdown: sock_no_shutdown,
|
setsockopt: sock_no_setsockopt,
|
setsockopt: sock_no_setsockopt,
|
getsockopt: sock_no_getsockopt,
|
getsockopt: sock_no_getsockopt,
|
sendmsg: netlink_sendmsg,
|
sendmsg: netlink_sendmsg,
|
recvmsg: netlink_recvmsg,
|
recvmsg: netlink_recvmsg,
|
mmap: sock_no_mmap,
|
mmap: sock_no_mmap,
|
sendpage: sock_no_sendpage,
|
sendpage: sock_no_sendpage,
|
};
|
};
|
|
|
struct net_proto_family netlink_family_ops = {
|
struct net_proto_family netlink_family_ops = {
|
PF_NETLINK,
|
PF_NETLINK,
|
netlink_create
|
netlink_create
|
};
|
};
|
|
|
static int __init netlink_proto_init(void)
|
static int __init netlink_proto_init(void)
|
{
|
{
|
struct sk_buff *dummy_skb;
|
struct sk_buff *dummy_skb;
|
|
|
if (sizeof(struct netlink_skb_parms) > sizeof(dummy_skb->cb)) {
|
if (sizeof(struct netlink_skb_parms) > sizeof(dummy_skb->cb)) {
|
printk(KERN_CRIT "netlink_init: panic\n");
|
printk(KERN_CRIT "netlink_init: panic\n");
|
return -1;
|
return -1;
|
}
|
}
|
sock_register(&netlink_family_ops);
|
sock_register(&netlink_family_ops);
|
#ifdef CONFIG_PROC_FS
|
#ifdef CONFIG_PROC_FS
|
create_proc_read_entry("net/netlink", 0, 0, netlink_read_proc, NULL);
|
create_proc_read_entry("net/netlink", 0, 0, netlink_read_proc, NULL);
|
#endif
|
#endif
|
return 0;
|
return 0;
|
}
|
}
|
|
|
static void __exit netlink_proto_exit(void)
|
static void __exit netlink_proto_exit(void)
|
{
|
{
|
sock_unregister(PF_NETLINK);
|
sock_unregister(PF_NETLINK);
|
remove_proc_entry("net/netlink", NULL);
|
remove_proc_entry("net/netlink", NULL);
|
}
|
}
|
|
|
module_init(netlink_proto_init);
|
module_init(netlink_proto_init);
|
module_exit(netlink_proto_exit);
|
module_exit(netlink_proto_exit);
|
|
|
