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xt_condition: support for Linux 3.10

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This commit is contained in:
Jan Engelhardt
2013-06-08 15:09:43 +02:00
parent b2cd0ab65b
commit db45bbcb9e
1 changed files with 29 additions and 20 deletions
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49
extensions/xt_condition.c
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@@ -52,6 +52,7 @@ struct condition_variable {
struct proc_dir_entry *status_proc;
unsigned int refcount;
bool enabled;
char name[sizeof(((struct xt_condition_mtinfo *)NULL)->name)];
};
/* proc_lock is a user context only semaphore used for write access */
@@ -61,22 +62,23 @@ static DEFINE_MUTEX(proc_lock);
static LIST_HEAD(conditions_list);
static struct proc_dir_entry *proc_net_condition;
static int condition_proc_read(char __user *buffer, char **start, off_t offset,
int length, int *eof, void *data)
static int condition_proc_show(struct seq_file *m, void *data)
{
const struct condition_variable *var = data;
const struct condition_variable *var = m->private;
buffer[0] = var->enabled ? '1' : '0';
buffer[1] = '\n';
if (length >= 2)
*eof = true;
return 2;
return seq_printf(m, var->enabled ? "1\n" : "0\n");
}
static int condition_proc_write(struct file *file, const char __user *buffer,
unsigned long length, void *data)
static int condition_proc_open(struct inode *inode, struct file *file)
{
struct condition_variable *var = data;
return single_open(file, condition_proc_show, PDE_DATA(inode));
}
static ssize_t
condition_proc_write(struct file *file, const char __user *buffer,
size_t length, loff_t *loff)
{
struct condition_variable *var = PDE_DATA(file_inode(file));
char newval;
if (length > 0) {
@@ -95,6 +97,14 @@ static int condition_proc_write(struct file *file, const char __user *buffer,
return length;
}
static const struct file_operations condition_proc_fops = {
.open = condition_proc_open,
.read = seq_read,
.llseek = seq_lseek,
.write = condition_proc_write,
.release = single_release,
};
static bool
condition_mt(const struct sk_buff *skb, struct xt_action_param *par)
{
@@ -124,7 +134,7 @@ static int condition_mt_check(const struct xt_mtchk_param *par)
*/
mutex_lock(&proc_lock);
list_for_each_entry(var, &conditions_list, list) {
if (strcmp(info->name, var->status_proc->name) == 0) {
if (strcmp(info->name, var->name) == 0) {
var->refcount++;
mutex_unlock(&proc_lock);
info->condvar = var;
@@ -139,24 +149,23 @@ static int condition_mt_check(const struct xt_mtchk_param *par)
return -ENOMEM;
}
memcpy(var->name, info->name, sizeof(info->name));
/* Create the condition variable's proc file entry. */
var->status_proc = create_proc_entry(info->name, condition_list_perms,
proc_net_condition);
var->status_proc = proc_create_data(info->name, condition_list_perms,
proc_net_condition, &condition_proc_fops, var);
if (var->status_proc == NULL) {
kfree(var);
mutex_unlock(&proc_lock);
return -ENOMEM;
}
proc_set_user(var->status_proc,
make_kuid(&init_user_ns, condition_uid_perms),
make_kgid(&init_user_ns, condition_gid_perms));
var->refcount = 1;
var->enabled = false;
var->status_proc->data = var;
wmb();
var->status_proc->read_proc = condition_proc_read;
var->status_proc->write_proc = condition_proc_write;
list_add(&var->list, &conditions_list);
var->status_proc->uid = make_kuid(&init_user_ns, condition_uid_perms);
var->status_proc->gid = make_kgid(&init_user_ns, condition_gid_perms);
mutex_unlock(&proc_lock);
info->condvar = var;
return 0;
@@ -170,7 +179,7 @@ static void condition_mt_destroy(const struct xt_mtdtor_param *par)
mutex_lock(&proc_lock);
if (--var->refcount == 0) {
list_del(&var->list);
remove_proc_entry(var->status_proc->name, proc_net_condition);
proc_remove(var->status_proc);
mutex_unlock(&proc_lock);
kfree(var);
return;