diff options
Diffstat (limited to 'net/dccp/probe.c')
| -rw-r--r-- | net/dccp/probe.c | 203 |
1 files changed, 0 insertions, 203 deletions
diff --git a/net/dccp/probe.c b/net/dccp/probe.c deleted file mode 100644 index 3d3fda05b32d..000000000000 --- a/net/dccp/probe.c +++ /dev/null @@ -1,203 +0,0 @@ -/* - * 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); -} - -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); - getnstimeofday64(&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"); |