[DCCP]: Introduce dccp_probe
This adds DCCP probing shamelessly ripped off from TCP probes by Stephen Hemminger. I've put in here support for further CCID3 variables as well. Andrea/Arnaldo might look to extend for CCID2. Signed-off-by: Ian McDonald <ian.mcdonald@jandi.co.nz> Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>wifi-calibration
Ian McDonald
Arnaldo Carvalho de Melo
parent
3dd9a7c3a1
commit
e41542f516
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@ -40,6 +40,22 @@ config IP_DCCP_DEBUG
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Just say N.
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config NET_DCCPPROBE
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tristate "DCCP connection probing"
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depends on PROC_FS && KPROBES
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---help---
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This module allows for capturing the changes to DCCP connection
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state in response to incoming packets. It is used for debugging
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DCCP congestion avoidance modules. If you don't understand
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what was just said, you don't need it: say N.
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Documentation on how to use the packet generator can be found
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at http://linux-net.osdl.org/index.php/DccpProbe
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To compile this code as a module, choose M here: the
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module will be called dccp_probe.
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endmenu
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endmenu
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@ -11,9 +11,11 @@ dccp_ipv4-y := ipv4.o
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dccp-$(CONFIG_IP_DCCP_ACKVEC) += ackvec.o
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obj-$(CONFIG_INET_DCCP_DIAG) += dccp_diag.o
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obj-$(CONFIG_NET_DCCPPROBE) += dccp_probe.o
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dccp-$(CONFIG_SYSCTL) += sysctl.o
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dccp_diag-y := diag.o
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dccp_probe-y := probe.o
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obj-y += ccids/
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@ -0,0 +1,198 @@
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/*
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* dccp_probe - Observe the DCCP flow with kprobes.
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*
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* The idea for this came from Werner Almesberger's umlsim
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* Copyright (C) 2004, Stephen Hemminger <shemminger@osdl.org>
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*
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* Modified for DCCP from Stephen Hemminger's code
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* Copyright (C) 2006, Ian McDonald <ian.mcdonald@jandi.co.nz>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/kernel.h>
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#include <linux/kprobes.h>
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#include <linux/socket.h>
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#include <linux/dccp.h>
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#include <linux/proc_fs.h>
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#include <linux/module.h>
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#include <linux/kfifo.h>
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#include <linux/vmalloc.h>
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#include "dccp.h"
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#include "ccid.h"
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#include "ccids/ccid3.h"
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static int port;
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static int bufsize = 64 * 1024;
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static const char procname[] = "dccpprobe";
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struct {
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struct kfifo *fifo;
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spinlock_t lock;
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wait_queue_head_t wait;
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struct timeval tstart;
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} dccpw;
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static void printl(const char *fmt, ...)
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{
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va_list args;
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int len;
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struct timeval now;
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char tbuf[256];
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va_start(args, fmt);
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do_gettimeofday(&now);
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now.tv_sec -= dccpw.tstart.tv_sec;
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now.tv_usec -= dccpw.tstart.tv_usec;
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if (now.tv_usec < 0) {
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--now.tv_sec;
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now.tv_usec += 1000000;
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}
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len = sprintf(tbuf, "%lu.%06lu ",
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(unsigned long) now.tv_sec,
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(unsigned long) now.tv_usec);
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len += vscnprintf(tbuf+len, sizeof(tbuf)-len, fmt, args);
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va_end(args);
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kfifo_put(dccpw.fifo, tbuf, len);
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wake_up(&dccpw.wait);
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}
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static int jdccp_sendmsg(struct kiocb *iocb, struct sock *sk,
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struct msghdr *msg, size_t size)
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{
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const struct dccp_minisock *dmsk = dccp_msk(sk);
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const struct inet_sock *inet = inet_sk(sk);
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const struct ccid3_hc_tx_sock *hctx;
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if (dmsk->dccpms_tx_ccid == DCCPC_CCID3)
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hctx = ccid3_hc_tx_sk(sk);
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else
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hctx = NULL;
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if (port == 0 || ntohs(inet->dport) == port ||
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ntohs(inet->sport) == port) {
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if (hctx)
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printl("%d.%d.%d.%d:%u %d.%d.%d.%d:%u %d %d %d %d %d\n",
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NIPQUAD(inet->saddr), ntohs(inet->sport),
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NIPQUAD(inet->daddr), ntohs(inet->dport), size,
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hctx->ccid3hctx_s, hctx->ccid3hctx_rtt,
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hctx->ccid3hctx_p, hctx->ccid3hctx_t_ipi);
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else
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printl("%d.%d.%d.%d:%u %d.%d.%d.%d:%u %d\n",
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NIPQUAD(inet->saddr), ntohs(inet->sport),
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NIPQUAD(inet->daddr), ntohs(inet->dport), size);
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}
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jprobe_return();
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return 0;
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}
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static struct jprobe dccp_send_probe = {
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.kp = { .addr = (kprobe_opcode_t *)&dccp_sendmsg, },
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.entry = (kprobe_opcode_t *)&jdccp_sendmsg,
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};
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static int dccpprobe_open(struct inode *inode, struct file *file)
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{
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kfifo_reset(dccpw.fifo);
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do_gettimeofday(&dccpw.tstart);
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return 0;
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}
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static ssize_t dccpprobe_read(struct file *file, char __user *buf,
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size_t len, loff_t *ppos)
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{
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int error = 0, cnt = 0;
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unsigned char *tbuf;
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if (!buf || len < 0)
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return -EINVAL;
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if (len == 0)
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return 0;
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tbuf = vmalloc(len);
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if (!tbuf)
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return -ENOMEM;
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error = wait_event_interruptible(dccpw.wait,
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__kfifo_len(dccpw.fifo) != 0);
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if (error)
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goto out_free;
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cnt = kfifo_get(dccpw.fifo, tbuf, len);
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error = copy_to_user(buf, tbuf, cnt);
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out_free:
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vfree(tbuf);
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return error ? error : cnt;
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}
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static struct file_operations dccpprobe_fops = {
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.owner = THIS_MODULE,
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.open = dccpprobe_open,
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.read = dccpprobe_read,
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};
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static __init int dccpprobe_init(void)
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{
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int ret = -ENOMEM;
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init_waitqueue_head(&dccpw.wait);
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spin_lock_init(&dccpw.lock);
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dccpw.fifo = kfifo_alloc(bufsize, GFP_KERNEL, &dccpw.lock);
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if (!proc_net_fops_create(procname, S_IRUSR, &dccpprobe_fops))
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goto err0;
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ret = register_jprobe(&dccp_send_probe);
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if (ret)
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goto err1;
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pr_info("DCCP watch registered (port=%d)\n", port);
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return 0;
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err1:
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proc_net_remove(procname);
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err0:
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kfifo_free(dccpw.fifo);
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return ret;
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}
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module_init(dccpprobe_init);
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static __exit void dccpprobe_exit(void)
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{
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kfifo_free(dccpw.fifo);
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proc_net_remove(procname);
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unregister_jprobe(&dccp_send_probe);
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}
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module_exit(dccpprobe_exit);
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MODULE_PARM_DESC(port, "Port to match (0=all)");
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module_param(port, int, 0);
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MODULE_PARM_DESC(bufsize, "Log buffer size (default 64k)");
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module_param(bufsize, int, 0);
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MODULE_AUTHOR("Ian McDonald <ian.mcdonald@jandi.co.nz>");
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MODULE_DESCRIPTION("DCCP snooper");
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MODULE_LICENSE("GPL");
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