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/* drivers/misc/uid_stat.c
*
* Copyright (C) 2008 - 2009 Google, Inc.
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#include <asm/atomic.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/proc_fs.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/stat.h>
#include <linux/uid_stat.h>
#include <net/activity_stats.h>
static DEFINE_SPINLOCK(uid_lock);
static LIST_HEAD(uid_list);
static struct proc_dir_entry *parent;
struct uid_stat {
struct list_head link;
uid_t uid;
atomic_t tcp_rcv;
atomic_t tcp_snd;
atomic_t tcp_rcv_pkt;
atomic_t tcp_snd_pkt;
atomic_t udp_rcv;
atomic_t udp_snd;
atomic_t udp_rcv_pkt;
atomic_t udp_snd_pkt;
};
static int read_proc_entry(char *page, char **start, off_t off,
int count, int *eof, void *data)
{
int len;
unsigned int value;
char *p = page;
atomic_t *uid_entry = (atomic_t *) data;
if (!data)
return 0;
value = (unsigned int) (atomic_read(uid_entry) + INT_MIN);
p += sprintf(p, "%u\n", value);
len = (p - page) - off;
*eof = (len <= count) ? 1 : 0;
*start = page + off;
return len;
}
/* Find or create a new entry for tracking the specified uid. */
static struct uid_stat *get_uid_stat(uid_t uid) {
unsigned long flags;
struct uid_stat *uid_entry;
struct uid_stat *new_uid;
struct proc_dir_entry *proc_entry;
char uid_s[32];
spin_lock_irqsave(&uid_lock, flags);
list_for_each_entry(uid_entry, &uid_list, link) {
if (uid_entry->uid == uid) {
spin_unlock_irqrestore(&uid_lock, flags);
return uid_entry;
}
}
spin_unlock_irqrestore(&uid_lock, flags);
/* Create a new entry for tracking the specified uid. */
if ((new_uid = kmalloc(sizeof(struct uid_stat), GFP_KERNEL)) == NULL)
return NULL;
new_uid->uid = uid;
/* Counters start at INT_MIN, so we can track 4GB of network traffic. */
atomic_set(&new_uid->tcp_rcv, INT_MIN);
atomic_set(&new_uid->tcp_snd, INT_MIN);
atomic_set(&new_uid->tcp_snd_pkt, INT_MIN);
atomic_set(&new_uid->tcp_rcv_pkt, INT_MIN);
atomic_set(&new_uid->udp_rcv, INT_MIN);
atomic_set(&new_uid->udp_snd, INT_MIN);
atomic_set(&new_uid->udp_snd_pkt, INT_MIN);
atomic_set(&new_uid->udp_rcv_pkt, INT_MIN);
/* Append the newly created uid stat struct to the list. */
spin_lock_irqsave(&uid_lock, flags);
list_add_tail(&new_uid->link, &uid_list);
spin_unlock_irqrestore(&uid_lock, flags);
sprintf(uid_s, "%d", uid);
proc_entry = proc_mkdir(uid_s, parent);
/* Keep reference to uid_stat so we know what uid to read stats from. */
create_proc_read_entry("tcp_snd", S_IRUGO, proc_entry, read_proc_entry,
(void *) &new_uid->tcp_snd);
create_proc_read_entry("tcp_rcv", S_IRUGO, proc_entry, read_proc_entry,
(void *) &new_uid->tcp_rcv);
create_proc_read_entry("tcp_snd_pkt", S_IRUGO, proc_entry, read_proc_entry,
(void *) &new_uid->tcp_snd_pkt);
create_proc_read_entry("tcp_rcv_pkt", S_IRUGO, proc_entry, read_proc_entry,
(void *) &new_uid->tcp_rcv_pkt);
create_proc_read_entry("udp_snd", S_IRUGO, proc_entry, read_proc_entry,
(void *) &new_uid->udp_snd);
create_proc_read_entry("udp_rcv", S_IRUGO, proc_entry, read_proc_entry,
(void *) &new_uid->udp_rcv);
create_proc_read_entry("udp_snd_pkt", S_IRUGO, proc_entry, read_proc_entry,
(void *) &new_uid->udp_snd_pkt);
create_proc_read_entry("udp_rcv_pkt", S_IRUGO, proc_entry, read_proc_entry,
(void *) &new_uid->udp_rcv_pkt);
return new_uid;
}
int uid_stat_tcp_snd(uid_t uid, int size) {
struct uid_stat *entry;
activity_stats_update();
if ((entry = get_uid_stat(uid)) == NULL) {
return -1;
}
atomic_add(size, &entry->tcp_snd);
atomic_inc(&entry->tcp_snd_pkt);
return 0;
}
int uid_stat_tcp_rcv(uid_t uid, int size) {
struct uid_stat *entry;
activity_stats_update();
if ((entry = get_uid_stat(uid)) == NULL) {
return -1;
}
atomic_add(size, &entry->tcp_rcv);
atomic_inc(&entry->tcp_rcv_pkt);
return 0;
}
int uid_stat_udp_snd(uid_t uid, int size) {
struct uid_stat *entry;
activity_stats_update();
if ((entry = get_uid_stat(uid)) == NULL) {
return -1;
}
atomic_add(size, &entry->udp_snd);
atomic_inc(&entry->udp_snd_pkt);
return 0;
}
int uid_stat_udp_rcv(uid_t uid, int size) {
struct uid_stat *entry;
activity_stats_update();
if ((entry = get_uid_stat(uid)) == NULL) {
return -1;
}
atomic_add(size, &entry->udp_rcv);
atomic_inc(&entry->udp_rcv_pkt);
return 0;
}
static int __init uid_stat_init(void)
{
parent = proc_mkdir("uid_stat", NULL);
if (!parent) {
pr_err("uid_stat: failed to create proc entry\n");
return -1;
}
return 0;
}
__initcall(uid_stat_init);
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