diff options
| -rw-r--r-- | drivers/misc/Kconfig | 4 | ||||
| -rw-r--r-- | drivers/misc/Makefile | 1 | ||||
| -rw-r--r-- | drivers/misc/uid_stat.c | 153 | ||||
| -rw-r--r-- | include/linux/uid_stat.h | 24 | ||||
| -rw-r--r-- | net/socket.c | 18 |
5 files changed, 198 insertions, 2 deletions
diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig index 25429f4ed5e5..4fa1e3a06ec3 100644 --- a/drivers/misc/Kconfig +++ b/drivers/misc/Kconfig @@ -250,6 +250,10 @@ config EP93XX_PWM To compile this driver as a module, choose M here: the module will be called ep93xx_pwm. +config UID_STAT + bool "UID based statistics tracking exported to /proc/uid_stat" + default n + source "drivers/misc/c2port/Kconfig" source "drivers/misc/eeprom/Kconfig" source "drivers/misc/cb710/Kconfig" diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile index 7b7a02d6fbe4..6c2b2baadeaa 100644 --- a/drivers/misc/Makefile +++ b/drivers/misc/Makefile @@ -21,6 +21,7 @@ obj-$(CONFIG_SGI_GRU) += sgi-gru/ obj-$(CONFIG_HP_ILO) += hpilo.o obj-$(CONFIG_ISL29003) += isl29003.o obj-$(CONFIG_EP93XX_PWM) += ep93xx_pwm.o +obj-$(CONFIG_UID_STAT) += uid_stat.o obj-$(CONFIG_C2PORT) += c2port/ obj-y += eeprom/ obj-y += cb710/ diff --git a/drivers/misc/uid_stat.c b/drivers/misc/uid_stat.c new file mode 100644 index 000000000000..43a548bab7ac --- /dev/null +++ b/drivers/misc/uid_stat.c @@ -0,0 +1,153 @@ +/* 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> + +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; +}; + +static struct uid_stat *find_uid_stat(uid_t uid) { + unsigned long flags; + struct uid_stat *entry; + + spin_lock_irqsave(&uid_lock, flags); + list_for_each_entry(entry, &uid_list, link) { + if (entry->uid == uid) { + spin_unlock_irqrestore(&uid_lock, flags); + return entry; + } + } + spin_unlock_irqrestore(&uid_lock, flags); + return NULL; +} + +static int tcp_snd_read_proc(char *page, char **start, off_t off, + int count, int *eof, void *data) +{ + int len; + unsigned int bytes; + char *p = page; + struct uid_stat *uid_entry = (struct uid_stat *) data; + if (!data) + return 0; + + bytes = (unsigned int) (atomic_read(&uid_entry->tcp_snd) + INT_MIN); + p += sprintf(p, "%u\n", bytes); + len = (p - page) - off; + *eof = (len <= count) ? 1 : 0; + *start = page + off; + return len; +} + +static int tcp_rcv_read_proc(char *page, char **start, off_t off, + int count, int *eof, void *data) +{ + int len; + unsigned int bytes; + char *p = page; + struct uid_stat *uid_entry = (struct uid_stat *) data; + if (!data) + return 0; + + bytes = (unsigned int) (atomic_read(&uid_entry->tcp_rcv) + INT_MIN); + p += sprintf(p, "%u\n", bytes); + len = (p - page) - off; + *eof = (len <= count) ? 1 : 0; + *start = page + off; + return len; +} + +/* Create a new entry for tracking the specified uid. */ +static struct uid_stat *create_stat(uid_t uid) { + unsigned long flags; + char uid_s[32]; + struct uid_stat *new_uid; + struct proc_dir_entry *entry; + + /* Create the uid stat struct and append it to the list. */ + 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); + + 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); + 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, entry , tcp_snd_read_proc, + (void *) new_uid); + + create_proc_read_entry("tcp_rcv", S_IRUGO, entry, tcp_rcv_read_proc, + (void *) new_uid); + + return new_uid; +} + +int update_tcp_snd(uid_t uid, int size) { + struct uid_stat *entry; + if ((entry = find_uid_stat(uid)) == NULL && + ((entry = create_stat(uid)) == NULL)) { + return -1; + } + atomic_add(size, &entry->tcp_snd); + return 0; +} + +int update_tcp_rcv(uid_t uid, int size) { + struct uid_stat *entry; + if ((entry = find_uid_stat(uid)) == NULL && + ((entry = create_stat(uid)) == NULL)) { + return -1; + } + atomic_add(size, &entry->tcp_rcv); + 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); diff --git a/include/linux/uid_stat.h b/include/linux/uid_stat.h new file mode 100644 index 000000000000..fcd3ab1f8d3d --- /dev/null +++ b/include/linux/uid_stat.h @@ -0,0 +1,24 @@ +/* include/linux/uid_stat.h + * + * 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. + * + */ + +#ifndef __uid_stat_h +#define __uid_stat_h + +/* Contains definitions for resource tracking per uid. */ + +extern int update_tcp_snd(uid_t uid, int size); +extern int update_tcp_rcv(uid_t uid, int size); + +#endif /* _LINUX_UID_STAT_H */ diff --git a/net/socket.c b/net/socket.c index 75655365b5fd..ed84099da26d 100644 --- a/net/socket.c +++ b/net/socket.c @@ -97,6 +97,10 @@ #include <net/sock.h> #include <linux/netfilter.h> +#ifdef CONFIG_UID_STAT +#include <linux/uid_stat.h> +#endif + static int sock_no_open(struct inode *irrelevant, struct file *dontcare); static ssize_t sock_aio_read(struct kiocb *iocb, const struct iovec *iov, unsigned long nr_segs, loff_t pos); @@ -570,7 +574,12 @@ static inline int __sock_sendmsg(struct kiocb *iocb, struct socket *sock, if (err) return err; - return sock->ops->sendmsg(iocb, sock, msg, size); + err = sock->ops->sendmsg(iocb, sock, msg, size); +#ifdef CONFIG_UID_STAT + if (err > 0) + update_tcp_snd(current_uid(), err); +#endif + return err; } int sock_sendmsg(struct socket *sock, struct msghdr *msg, size_t size) @@ -684,7 +693,12 @@ static inline int __sock_recvmsg(struct kiocb *iocb, struct socket *sock, if (err) return err; - return sock->ops->recvmsg(iocb, sock, msg, size, flags); + err = sock->ops->recvmsg(iocb, sock, msg, size, flags); +#ifdef CONFIG_UID_STAT + if (err > 0) + update_tcp_rcv(current_uid(), err); +#endif + return err; } int sock_recvmsg(struct socket *sock, struct msghdr *msg, |