kernel-ark/net/dccp/probe.c
Ying Xue 1b78414047 net: Remove iocb argument from sendmsg and recvmsg
After TIPC doesn't depend on iocb argument in its internal
implementations of sendmsg() and recvmsg() hooks defined in proto
structure, no any user is using iocb argument in them at all now.
Then we can drop the redundant iocb argument completely from kinds of
implementations of both sendmsg() and recvmsg() in the entire
networking stack.

Cc: Christoph Hellwig <hch@lst.de>
Suggested-by: Al Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: Ying Xue <ying.xue@windriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2015-03-02 13:06:31 -05:00

203 lines
4.8 KiB
C

/*
* dccp_probe - Observe the DCCP flow with kprobes.
*
* The idea for this came from Werner Almesberger's umlsim
* Copyright (C) 2004, Stephen Hemminger <shemminger@osdl.org>
*
* Modified for DCCP from Stephen Hemminger's code
* Copyright (C) 2006, Ian McDonald <ian.mcdonald@jandi.co.nz>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/kernel.h>
#include <linux/kprobes.h>
#include <linux/socket.h>
#include <linux/dccp.h>
#include <linux/proc_fs.h>
#include <linux/module.h>
#include <linux/kfifo.h>
#include <linux/vmalloc.h>
#include <linux/gfp.h>
#include <net/net_namespace.h>
#include "dccp.h"
#include "ccid.h"
#include "ccids/ccid3.h"
static int port;
static int bufsize = 64 * 1024;
static const char procname[] = "dccpprobe";
static struct {
struct kfifo fifo;
spinlock_t lock;
wait_queue_head_t wait;
struct timespec tstart;
} dccpw;
static void printl(const char *fmt, ...)
{
va_list args;
int len;
struct timespec now;
char tbuf[256];
va_start(args, fmt);
getnstimeofday(&now);
now = timespec_sub(now, dccpw.tstart);
len = sprintf(tbuf, "%lu.%06lu ",
(unsigned long) now.tv_sec,
(unsigned long) now.tv_nsec / NSEC_PER_USEC);
len += vscnprintf(tbuf+len, sizeof(tbuf)-len, fmt, args);
va_end(args);
kfifo_in_locked(&dccpw.fifo, tbuf, len, &dccpw.lock);
wake_up(&dccpw.wait);
}
static int jdccp_sendmsg(struct sock *sk, struct msghdr *msg, size_t size)
{
const struct inet_sock *inet = inet_sk(sk);
struct ccid3_hc_tx_sock *hc = NULL;
if (ccid_get_current_tx_ccid(dccp_sk(sk)) == DCCPC_CCID3)
hc = ccid3_hc_tx_sk(sk);
if (port == 0 || ntohs(inet->inet_dport) == port ||
ntohs(inet->inet_sport) == port) {
if (hc)
printl("%pI4:%u %pI4:%u %d %d %d %d %u %llu %llu %d\n",
&inet->inet_saddr, ntohs(inet->inet_sport),
&inet->inet_daddr, ntohs(inet->inet_dport), size,
hc->tx_s, hc->tx_rtt, hc->tx_p,
hc->tx_x_calc, hc->tx_x_recv >> 6,
hc->tx_x >> 6, hc->tx_t_ipi);
else
printl("%pI4:%u %pI4:%u %d\n",
&inet->inet_saddr, ntohs(inet->inet_sport),
&inet->inet_daddr, ntohs(inet->inet_dport),
size);
}
jprobe_return();
return 0;
}
static struct jprobe dccp_send_probe = {
.kp = {
.symbol_name = "dccp_sendmsg",
},
.entry = jdccp_sendmsg,
};
static int dccpprobe_open(struct inode *inode, struct file *file)
{
kfifo_reset(&dccpw.fifo);
getnstimeofday(&dccpw.tstart);
return 0;
}
static ssize_t dccpprobe_read(struct file *file, char __user *buf,
size_t len, loff_t *ppos)
{
int error = 0, cnt = 0;
unsigned char *tbuf;
if (!buf)
return -EINVAL;
if (len == 0)
return 0;
tbuf = vmalloc(len);
if (!tbuf)
return -ENOMEM;
error = wait_event_interruptible(dccpw.wait,
kfifo_len(&dccpw.fifo) != 0);
if (error)
goto out_free;
cnt = kfifo_out_locked(&dccpw.fifo, tbuf, len, &dccpw.lock);
error = copy_to_user(buf, tbuf, cnt) ? -EFAULT : 0;
out_free:
vfree(tbuf);
return error ? error : cnt;
}
static const struct file_operations dccpprobe_fops = {
.owner = THIS_MODULE,
.open = dccpprobe_open,
.read = dccpprobe_read,
.llseek = noop_llseek,
};
static __init int dccpprobe_init(void)
{
int ret = -ENOMEM;
init_waitqueue_head(&dccpw.wait);
spin_lock_init(&dccpw.lock);
if (kfifo_alloc(&dccpw.fifo, bufsize, GFP_KERNEL))
return ret;
if (!proc_create(procname, S_IRUSR, init_net.proc_net, &dccpprobe_fops))
goto err0;
ret = register_jprobe(&dccp_send_probe);
if (ret) {
ret = request_module("dccp");
if (!ret)
ret = register_jprobe(&dccp_send_probe);
}
if (ret)
goto err1;
pr_info("DCCP watch registered (port=%d)\n", port);
return 0;
err1:
remove_proc_entry(procname, init_net.proc_net);
err0:
kfifo_free(&dccpw.fifo);
return ret;
}
module_init(dccpprobe_init);
static __exit void dccpprobe_exit(void)
{
kfifo_free(&dccpw.fifo);
remove_proc_entry(procname, init_net.proc_net);
unregister_jprobe(&dccp_send_probe);
}
module_exit(dccpprobe_exit);
MODULE_PARM_DESC(port, "Port to match (0=all)");
module_param(port, int, 0);
MODULE_PARM_DESC(bufsize, "Log buffer size (default 64k)");
module_param(bufsize, int, 0);
MODULE_AUTHOR("Ian McDonald <ian.mcdonald@jandi.co.nz>");
MODULE_DESCRIPTION("DCCP snooper");
MODULE_LICENSE("GPL");