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![Gerrit Renker](/assets/img/avatar_default.png)
This provides function to query the current TX/RX CCID dynamically, without reliance on the minisock value, using dynamic information available in the currently loaded CCID module. This query function is then used to (a) provide the getsockopt part for getting/setting CCIDs via sockopts; (b) replace the current test for "which CCID is in use" in probe.c. Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk> Acked-by: Ian McDonald <ian.mcdonald@jandi.co.nz> Signed-off-by: David S. Miller <davem@davemloft.net>
198 lines
4.7 KiB
C
198 lines
4.7 KiB
C
/*
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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 <net/net_namespace.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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static 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 timespec 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 timespec now;
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char tbuf[256];
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va_start(args, fmt);
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getnstimeofday(&now);
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now = timespec_sub(now, dccpw.tstart);
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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_nsec / NSEC_PER_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 inet_sock *inet = inet_sk(sk);
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struct ccid3_hc_tx_sock *hctx = NULL;
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if (ccid_get_current_tx_ccid(dccp_sk(sk)) == DCCPC_CCID3)
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hctx = ccid3_hc_tx_sk(sk);
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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("%pI4:%u %pI4:%u %d %d %d %d %u "
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"%llu %llu %d\n",
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&inet->saddr, ntohs(inet->sport),
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&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_x_calc,
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hctx->ccid3hctx_x_recv >> 6,
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hctx->ccid3hctx_x >> 6, hctx->ccid3hctx_t_ipi);
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else
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printl("%pI4:%u %pI4:%u %d\n",
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&inet->saddr, ntohs(inet->sport),
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&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 = {
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.symbol_name = "dccp_sendmsg",
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},
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.entry = 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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getnstimeofday(&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)
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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) ? -EFAULT : 0;
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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 const 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 (IS_ERR(dccpw.fifo))
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return PTR_ERR(dccpw.fifo);
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if (!proc_net_fops_create(&init_net, 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(&init_net, 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(&init_net, 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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