cregit-Linux how code gets into the kernel

Release 4.11 net/dccp/probe.c

Directory: net/dccp
/*
 * 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

PersonTokensPropCommitsCommitProp
Ian McDonald11386.92%116.67%
Stefani Seibold75.38%350.00%
Hideaki Yoshifuji / 吉藤英明75.38%116.67%
Tina Ruchandani32.31%116.67%
Total130100.00%6100.00%


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

PersonTokensPropCommitsCommitProp
Ian McDonald13572.19%114.29%
Gerrit Renker3719.79%457.14%
Eric Dumazet105.35%114.29%
Harvey Harrison52.67%114.29%
Total187100.00%7100.00%

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

PersonTokensPropCommitsCommitProp
Ian McDonald3394.29%133.33%
Tina Ruchandani12.86%133.33%
Stefani Seibold12.86%133.33%
Total35100.00%3100.00%


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

PersonTokensPropCommitsCommitProp
Ian McDonald13290.41%116.67%
Stefani Seibold96.16%466.67%
Pavel Emelyanov53.42%116.67%
Total146100.00%6100.00%

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

PersonTokensPropCommitsCommitProp
Ian McDonald8559.44%114.29%
Wang Weidong3121.68%114.29%
Gao Feng106.99%228.57%
Akinobu Mita106.99%114.29%
Stefani Seibold53.50%114.29%
Gerrit Renker21.40%114.29%
Total143100.00%7100.00%

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

PersonTokensPropCommitsCommitProp
Ian McDonald2681.25%133.33%
Gao Feng515.62%133.33%
Stefani Seibold13.12%133.33%
Total32100.00%3100.00%

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

PersonTokensPropCommitsCommitProp
Ian McDonald69780.76%28.00%
Gerrit Renker404.63%624.00%
Wang Weidong313.59%14.00%
Stefani Seibold232.67%416.00%
Gao Feng151.74%28.00%
Akinobu Mita101.16%14.00%
Eric Dumazet101.16%14.00%
Tina Ruchandani80.93%14.00%
Hideaki Yoshifuji / 吉藤英明70.81%14.00%
Pavel Emelyanov50.58%14.00%
Arnd Bergmann50.58%14.00%
Harvey Harrison50.58%14.00%
Eric W. Biedermann30.35%14.00%
Tejun Heo30.35%14.00%
Arjan van de Ven10.12%14.00%
Total863100.00%25100.00%
Directory: net/dccp
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