1e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald/* 2e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald * dccp_probe - Observe the DCCP flow with kprobes. 3e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald * 4e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald * The idea for this came from Werner Almesberger's umlsim 5e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald * Copyright (C) 2004, Stephen Hemminger <shemminger@osdl.org> 6e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald * 7e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald * Modified for DCCP from Stephen Hemminger's code 8e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald * Copyright (C) 2006, Ian McDonald <ian.mcdonald@jandi.co.nz> 9e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald * 10e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald * This program is free software; you can redistribute it and/or modify 11e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald * it under the terms of the GNU General Public License as published by 12e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald * the Free Software Foundation; either version 2 of the License, or 13e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald * (at your option) any later version. 14e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald * 15e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald * This program is distributed in the hope that it will be useful, 16e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald * but WITHOUT ANY WARRANTY; without even the implied warranty of 17e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald * GNU General Public License for more details. 19e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald * 20e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald * You should have received a copy of the GNU General Public License 21e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald * along with this program; if not, write to the Free Software 22e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 23e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald */ 24e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald 25e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald#include <linux/kernel.h> 26e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald#include <linux/kprobes.h> 27e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald#include <linux/socket.h> 28e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald#include <linux/dccp.h> 29e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald#include <linux/proc_fs.h> 30e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald#include <linux/module.h> 31e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald#include <linux/kfifo.h> 32e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald#include <linux/vmalloc.h> 335a0e3ad6af8660be21ca98a971cd00f331318c05Tejun Heo#include <linux/gfp.h> 34457c4cbc5a3dde259d2a1f15d5f9785290397267Eric W. Biederman#include <net/net_namespace.h> 35e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald 36e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald#include "dccp.h" 37e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald#include "ccid.h" 38e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald#include "ccids/ccid3.h" 39e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald 40e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonaldstatic int port; 41e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald 42e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonaldstatic int bufsize = 64 * 1024; 43e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald 44e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonaldstatic const char procname[] = "dccpprobe"; 45e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald 461e2f0e5e8376f2a0ada8760fc9d3104e1a81382bGerrit Renkerstatic struct { 4745465487897a1c6d508b14b904dc5777f7ec7e04Stefani Seibold struct kfifo fifo; 48e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald spinlock_t lock; 49e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald wait_queue_head_t wait; 50cdd04d98f6922f5a7ba52714f077140d42bc67c9YOSHIFUJI Hideaki struct timespec tstart; 51e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald} dccpw; 52e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald 53e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonaldstatic void printl(const char *fmt, ...) 54e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald{ 55e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald va_list args; 56e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald int len; 57cdd04d98f6922f5a7ba52714f077140d42bc67c9YOSHIFUJI Hideaki struct timespec now; 58e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald char tbuf[256]; 59e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald 60e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald va_start(args, fmt); 61cdd04d98f6922f5a7ba52714f077140d42bc67c9YOSHIFUJI Hideaki getnstimeofday(&now); 62e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald 63cdd04d98f6922f5a7ba52714f077140d42bc67c9YOSHIFUJI Hideaki now = timespec_sub(now, dccpw.tstart); 64e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald 65e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald len = sprintf(tbuf, "%lu.%06lu ", 66e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald (unsigned long) now.tv_sec, 67cdd04d98f6922f5a7ba52714f077140d42bc67c9YOSHIFUJI Hideaki (unsigned long) now.tv_nsec / NSEC_PER_USEC); 68e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald len += vscnprintf(tbuf+len, sizeof(tbuf)-len, fmt, args); 69e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald va_end(args); 70e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald 717acd72eb85f1c7a15e8b5eb554994949241737f1Stefani Seibold kfifo_in_locked(&dccpw.fifo, tbuf, len, &dccpw.lock); 72e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald wake_up(&dccpw.wait); 73e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald} 74e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald 75e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonaldstatic int jdccp_sendmsg(struct kiocb *iocb, struct sock *sk, 76e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald struct msghdr *msg, size_t size) 77e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald{ 78e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald const struct inet_sock *inet = inet_sk(sk); 79996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker struct ccid3_hc_tx_sock *hc = NULL; 80e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald 8171c262a3dd42dea73700646d969b0af7a4102edfGerrit Renker if (ccid_get_current_tx_ccid(dccp_sk(sk)) == DCCPC_CCID3) 82996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker hc = ccid3_hc_tx_sk(sk); 83e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald 84c720c7e8383aff1cb219bddf474ed89d850336e3Eric Dumazet if (port == 0 || ntohs(inet->inet_dport) == port || 85c720c7e8383aff1cb219bddf474ed89d850336e3Eric Dumazet ntohs(inet->inet_sport) == port) { 86996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker if (hc) 87388d5e9905dd80648fff5ccaefdd8c0fcedb3eaeGerrit Renker printl("%pI4:%u %pI4:%u %d %d %d %d %u %llu %llu %d\n", 88c720c7e8383aff1cb219bddf474ed89d850336e3Eric Dumazet &inet->inet_saddr, ntohs(inet->inet_sport), 89c720c7e8383aff1cb219bddf474ed89d850336e3Eric Dumazet &inet->inet_daddr, ntohs(inet->inet_dport), size, 90996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker hc->tx_s, hc->tx_rtt, hc->tx_p, 91996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker hc->tx_x_calc, hc->tx_x_recv >> 6, 92996ccf49005662ee7fee38a45be5cb27bf370b1dGerrit Renker hc->tx_x >> 6, hc->tx_t_ipi); 93e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald else 9421454aaad30651ba0dcc16fe5271bc12ee21f132Harvey Harrison printl("%pI4:%u %pI4:%u %d\n", 95c720c7e8383aff1cb219bddf474ed89d850336e3Eric Dumazet &inet->inet_saddr, ntohs(inet->inet_sport), 96c720c7e8383aff1cb219bddf474ed89d850336e3Eric Dumazet &inet->inet_daddr, ntohs(inet->inet_dport), 97c720c7e8383aff1cb219bddf474ed89d850336e3Eric Dumazet size); 98e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald } 99e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald 100e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald jprobe_return(); 101e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald return 0; 102e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald} 103e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald 104e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonaldstatic struct jprobe dccp_send_probe = { 105e1b7441e803442828780a6d6d792643f79d5665bIan McDonald .kp = { 106e1b7441e803442828780a6d6d792643f79d5665bIan McDonald .symbol_name = "dccp_sendmsg", 107e1b7441e803442828780a6d6d792643f79d5665bIan McDonald }, 1089e367d859297b9377d65574f538cf52730e9eda8Michael Ellerman .entry = jdccp_sendmsg, 109e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald}; 110e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald 111e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonaldstatic int dccpprobe_open(struct inode *inode, struct file *file) 112e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald{ 11345465487897a1c6d508b14b904dc5777f7ec7e04Stefani Seibold kfifo_reset(&dccpw.fifo); 114cdd04d98f6922f5a7ba52714f077140d42bc67c9YOSHIFUJI Hideaki getnstimeofday(&dccpw.tstart); 115e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald return 0; 116e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald} 117e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald 118e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonaldstatic ssize_t dccpprobe_read(struct file *file, char __user *buf, 119e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald size_t len, loff_t *ppos) 120e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald{ 121e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald int error = 0, cnt = 0; 122e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald unsigned char *tbuf; 123e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald 12475202e76893c11ce7f8bcc9a07f994d71e3d5113Bill Nottingham if (!buf) 125e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald return -EINVAL; 126e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald 127e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald if (len == 0) 128e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald return 0; 129e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald 130e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald tbuf = vmalloc(len); 131e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald if (!tbuf) 132e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald return -ENOMEM; 133e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald 134e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald error = wait_event_interruptible(dccpw.wait, 135e64c026dd09b73faf20707711402fc5ed55a8e70Stefani Seibold kfifo_len(&dccpw.fifo) != 0); 136e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald if (error) 137e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald goto out_free; 138e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald 1397acd72eb85f1c7a15e8b5eb554994949241737f1Stefani Seibold cnt = kfifo_out_locked(&dccpw.fifo, tbuf, len, &dccpw.lock); 140653252c2302cdf2dfbca66a7e177f7db783f9efaPavel Emelyanov error = copy_to_user(buf, tbuf, cnt) ? -EFAULT : 0; 141e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald 142e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonaldout_free: 143e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald vfree(tbuf); 144e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald 145e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald return error ? error : cnt; 146e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald} 147e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald 1489a32144e9d7b4e21341174b1a83b82a82353be86Arjan van de Venstatic const struct file_operations dccpprobe_fops = { 149e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald .owner = THIS_MODULE, 150e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald .open = dccpprobe_open, 151e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald .read = dccpprobe_read, 1526038f373a3dc1f1c26496e60b6c40b164716f07eArnd Bergmann .llseek = noop_llseek, 153e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald}; 154e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald 155e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonaldstatic __init int dccpprobe_init(void) 156e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald{ 157e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald int ret = -ENOMEM; 158e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald 159e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald init_waitqueue_head(&dccpw.wait); 160e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald spin_lock_init(&dccpw.lock); 161c1e13f25674ed564948ecb7dfe5f83e578892896Stefani Seibold if (kfifo_alloc(&dccpw.fifo, bufsize, GFP_KERNEL)) 16245465487897a1c6d508b14b904dc5777f7ec7e04Stefani Seibold return ret; 163d4beaa66add8aebf83ab16d2fde4e4de8dac36dfGao feng if (!proc_create(procname, S_IRUSR, init_net.proc_net, &dccpprobe_fops)) 164e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald goto err0; 165e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald 166965cdea825693c821d200e38fac9402cde6dce6aWang Weidong ret = register_jprobe(&dccp_send_probe); 167965cdea825693c821d200e38fac9402cde6dce6aWang Weidong if (ret) { 168965cdea825693c821d200e38fac9402cde6dce6aWang Weidong ret = request_module("dccp"); 169965cdea825693c821d200e38fac9402cde6dce6aWang Weidong if (!ret) 170965cdea825693c821d200e38fac9402cde6dce6aWang Weidong ret = register_jprobe(&dccp_send_probe); 171965cdea825693c821d200e38fac9402cde6dce6aWang Weidong } 172965cdea825693c821d200e38fac9402cde6dce6aWang Weidong 173e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald if (ret) 174e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald goto err1; 175e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald 176e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald pr_info("DCCP watch registered (port=%d)\n", port); 177e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald return 0; 178e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonalderr1: 179ece31ffd539e8e2b586b1ca5f50bc4f4591e3893Gao feng remove_proc_entry(procname, init_net.proc_net); 180e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonalderr0: 18145465487897a1c6d508b14b904dc5777f7ec7e04Stefani Seibold kfifo_free(&dccpw.fifo); 182e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald return ret; 183e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald} 184e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonaldmodule_init(dccpprobe_init); 185e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald 186e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonaldstatic __exit void dccpprobe_exit(void) 187e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald{ 18845465487897a1c6d508b14b904dc5777f7ec7e04Stefani Seibold kfifo_free(&dccpw.fifo); 189ece31ffd539e8e2b586b1ca5f50bc4f4591e3893Gao feng remove_proc_entry(procname, init_net.proc_net); 190e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald unregister_jprobe(&dccp_send_probe); 191e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald 192e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald} 193e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonaldmodule_exit(dccpprobe_exit); 194e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald 195e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonaldMODULE_PARM_DESC(port, "Port to match (0=all)"); 196e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonaldmodule_param(port, int, 0); 197e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald 198e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonaldMODULE_PARM_DESC(bufsize, "Log buffer size (default 64k)"); 199e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonaldmodule_param(bufsize, int, 0); 200e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonald 201e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonaldMODULE_AUTHOR("Ian McDonald <ian.mcdonald@jandi.co.nz>"); 202e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonaldMODULE_DESCRIPTION("DCCP snooper"); 203e41542f5167d6b506607f8dd111fa0a3e468ccb8Ian McDonaldMODULE_LICENSE("GPL"); 204