Release 4.11 net/dccp/probe.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/time64.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 timespec64 tstart;
}
dccpw;
static void printl(const char *fmt, ...)
{
va_list args;
int len;
struct timespec64 now;
char tbuf[256];
va_start(args, fmt);
getnstimeofday64(&now);
now = timespec64_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);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Ian McDonald | 113 | 86.92% | 1 | 16.67% |
Stefani Seibold | 7 | 5.38% | 3 | 50.00% |
Hideaki Yoshifuji / 吉藤英明 | 7 | 5.38% | 1 | 16.67% |
Tina Ruchandani | 3 | 2.31% | 1 | 16.67% |
Total | 130 | 100.00% | 6 | 100.00% |
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;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Ian McDonald | 135 | 72.19% | 1 | 14.29% |
Gerrit Renker | 37 | 19.79% | 4 | 57.14% |
Eric Dumazet | 10 | 5.35% | 1 | 14.29% |
Harvey Harrison | 5 | 2.67% | 1 | 14.29% |
Total | 187 | 100.00% | 7 | 100.00% |
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);
getnstimeofday64(&dccpw.tstart);
return 0;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Ian McDonald | 33 | 94.29% | 1 | 33.33% |
Tina Ruchandani | 1 | 2.86% | 1 | 33.33% |
Stefani Seibold | 1 | 2.86% | 1 | 33.33% |
Total | 35 | 100.00% | 3 | 100.00% |
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;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Ian McDonald | 132 | 90.41% | 1 | 16.67% |
Stefani Seibold | 9 | 6.16% | 4 | 66.67% |
Pavel Emelyanov | 5 | 3.42% | 1 | 16.67% |
Total | 146 | 100.00% | 6 | 100.00% |
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;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Ian McDonald | 85 | 59.44% | 1 | 14.29% |
Wang Weidong | 31 | 21.68% | 1 | 14.29% |
Gao Feng | 10 | 6.99% | 2 | 28.57% |
Akinobu Mita | 10 | 6.99% | 1 | 14.29% |
Stefani Seibold | 5 | 3.50% | 1 | 14.29% |
Gerrit Renker | 2 | 1.40% | 1 | 14.29% |
Total | 143 | 100.00% | 7 | 100.00% |
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);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Ian McDonald | 26 | 81.25% | 1 | 33.33% |
Gao Feng | 5 | 15.62% | 1 | 33.33% |
Stefani Seibold | 1 | 3.12% | 1 | 33.33% |
Total | 32 | 100.00% | 3 | 100.00% |
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");
Overall Contributors
Person | Tokens | Prop | Commits | CommitProp |
Ian McDonald | 697 | 80.76% | 2 | 8.00% |
Gerrit Renker | 40 | 4.63% | 6 | 24.00% |
Wang Weidong | 31 | 3.59% | 1 | 4.00% |
Stefani Seibold | 23 | 2.67% | 4 | 16.00% |
Gao Feng | 15 | 1.74% | 2 | 8.00% |
Akinobu Mita | 10 | 1.16% | 1 | 4.00% |
Eric Dumazet | 10 | 1.16% | 1 | 4.00% |
Tina Ruchandani | 8 | 0.93% | 1 | 4.00% |
Hideaki Yoshifuji / 吉藤英明 | 7 | 0.81% | 1 | 4.00% |
Pavel Emelyanov | 5 | 0.58% | 1 | 4.00% |
Arnd Bergmann | 5 | 0.58% | 1 | 4.00% |
Harvey Harrison | 5 | 0.58% | 1 | 4.00% |
Eric W. Biedermann | 3 | 0.35% | 1 | 4.00% |
Tejun Heo | 3 | 0.35% | 1 | 4.00% |
Arjan van de Ven | 1 | 0.12% | 1 | 4.00% |
Total | 863 | 100.00% | 25 | 100.00% |
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