2006-09-22 04:28:01 +02:00
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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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2007-09-12 12:01:34 +02:00
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#include <net/net_namespace.h>
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2006-09-22 04:28:01 +02:00
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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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2008-06-11 12:19:09 +02:00
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static struct {
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kfifo: move struct kfifo in place
This is a new generic kernel FIFO implementation.
The current kernel fifo API is not very widely used, because it has to
many constrains. Only 17 files in the current 2.6.31-rc5 used it.
FIFO's are like list's a very basic thing and a kfifo API which handles
the most use case would save a lot of development time and memory
resources.
I think this are the reasons why kfifo is not in use:
- The API is to simple, important functions are missing
- A fifo can be only allocated dynamically
- There is a requirement of a spinlock whether you need it or not
- There is no support for data records inside a fifo
So I decided to extend the kfifo in a more generic way without blowing up
the API to much. The new API has the following benefits:
- Generic usage: For kernel internal use and/or device driver.
- Provide an API for the most use case.
- Slim API: The whole API provides 25 functions.
- Linux style habit.
- DECLARE_KFIFO, DEFINE_KFIFO and INIT_KFIFO Macros
- Direct copy_to_user from the fifo and copy_from_user into the fifo.
- The kfifo itself is an in place member of the using data structure, this save an
indirection access and does not waste the kernel allocator.
- Lockless access: if only one reader and one writer is active on the fifo,
which is the common use case, no additional locking is necessary.
- Remove spinlock - give the user the freedom of choice what kind of locking to use if
one is required.
- Ability to handle records. Three type of records are supported:
- Variable length records between 0-255 bytes, with a record size
field of 1 bytes.
- Variable length records between 0-65535 bytes, with a record size
field of 2 bytes.
- Fixed size records, which no record size field.
- Preserve memory resource.
- Performance!
- Easy to use!
This patch:
Since most users want to have the kfifo as part of another object,
reorganize the code to allow including struct kfifo in another data
structure. This requires changing the kfifo_alloc and kfifo_init
prototypes so that we pass an existing kfifo pointer into them. This
patch changes the implementation and all existing users.
[akpm@linux-foundation.org: fix warning]
Signed-off-by: Stefani Seibold <stefani@seibold.net>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
Acked-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Acked-by: Andi Kleen <ak@linux.intel.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-12-21 23:37:26 +01:00
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struct kfifo fifo;
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2006-09-22 04:28:01 +02:00
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spinlock_t lock;
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wait_queue_head_t wait;
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2008-04-21 23:28:45 +02:00
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struct timespec tstart;
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2006-09-22 04:28:01 +02:00
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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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2008-04-21 23:28:45 +02:00
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struct timespec now;
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2006-09-22 04:28:01 +02:00
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char tbuf[256];
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va_start(args, fmt);
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2008-04-21 23:28:45 +02:00
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getnstimeofday(&now);
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2006-09-22 04:28:01 +02:00
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2008-04-21 23:28:45 +02:00
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now = timespec_sub(now, dccpw.tstart);
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2006-09-22 04:28:01 +02:00
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len = sprintf(tbuf, "%lu.%06lu ",
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(unsigned long) now.tv_sec,
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2008-04-21 23:28:45 +02:00
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(unsigned long) now.tv_nsec / NSEC_PER_USEC);
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2006-09-22 04:28:01 +02:00
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len += vscnprintf(tbuf+len, sizeof(tbuf)-len, fmt, args);
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va_end(args);
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2009-12-21 23:37:27 +01:00
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kfifo_put_locked(&dccpw.fifo, tbuf, len, &dccpw.lock);
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2006-09-22 04:28:01 +02:00
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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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2009-10-05 02:53:13 +02:00
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struct ccid3_hc_tx_sock *hc = NULL;
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2006-09-22 04:28:01 +02:00
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2008-11-24 01:04:59 +01:00
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if (ccid_get_current_tx_ccid(dccp_sk(sk)) == DCCPC_CCID3)
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2009-10-05 02:53:13 +02:00
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hc = ccid3_hc_tx_sk(sk);
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2006-09-22 04:28:01 +02:00
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2009-10-15 08:30:45 +02:00
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if (port == 0 || ntohs(inet->inet_dport) == port ||
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ntohs(inet->inet_sport) == port) {
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2009-10-05 02:53:13 +02:00
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if (hc)
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2009-10-05 02:53:11 +02:00
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printl("%pI4:%u %pI4:%u %d %d %d %d %u %llu %llu %d\n",
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2009-10-15 08:30:45 +02:00
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&inet->inet_saddr, ntohs(inet->inet_sport),
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&inet->inet_daddr, ntohs(inet->inet_dport), size,
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2009-10-05 02:53:13 +02:00
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hc->tx_s, hc->tx_rtt, hc->tx_p,
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hc->tx_x_calc, hc->tx_x_recv >> 6,
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hc->tx_x >> 6, hc->tx_t_ipi);
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2006-09-22 04:28:01 +02:00
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else
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2008-10-31 08:54:56 +01:00
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printl("%pI4:%u %pI4:%u %d\n",
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2009-10-15 08:30:45 +02:00
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&inet->inet_saddr, ntohs(inet->inet_sport),
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&inet->inet_daddr, ntohs(inet->inet_dport),
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size);
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2006-09-22 04:28:01 +02:00
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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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2006-11-20 21:41:37 +01:00
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.kp = {
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.symbol_name = "dccp_sendmsg",
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},
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2007-07-19 10:48:10 +02:00
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.entry = jdccp_sendmsg,
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2006-09-22 04:28:01 +02:00
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};
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static int dccpprobe_open(struct inode *inode, struct file *file)
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{
|
kfifo: move struct kfifo in place
This is a new generic kernel FIFO implementation.
The current kernel fifo API is not very widely used, because it has to
many constrains. Only 17 files in the current 2.6.31-rc5 used it.
FIFO's are like list's a very basic thing and a kfifo API which handles
the most use case would save a lot of development time and memory
resources.
I think this are the reasons why kfifo is not in use:
- The API is to simple, important functions are missing
- A fifo can be only allocated dynamically
- There is a requirement of a spinlock whether you need it or not
- There is no support for data records inside a fifo
So I decided to extend the kfifo in a more generic way without blowing up
the API to much. The new API has the following benefits:
- Generic usage: For kernel internal use and/or device driver.
- Provide an API for the most use case.
- Slim API: The whole API provides 25 functions.
- Linux style habit.
- DECLARE_KFIFO, DEFINE_KFIFO and INIT_KFIFO Macros
- Direct copy_to_user from the fifo and copy_from_user into the fifo.
- The kfifo itself is an in place member of the using data structure, this save an
indirection access and does not waste the kernel allocator.
- Lockless access: if only one reader and one writer is active on the fifo,
which is the common use case, no additional locking is necessary.
- Remove spinlock - give the user the freedom of choice what kind of locking to use if
one is required.
- Ability to handle records. Three type of records are supported:
- Variable length records between 0-255 bytes, with a record size
field of 1 bytes.
- Variable length records between 0-65535 bytes, with a record size
field of 2 bytes.
- Fixed size records, which no record size field.
- Preserve memory resource.
- Performance!
- Easy to use!
This patch:
Since most users want to have the kfifo as part of another object,
reorganize the code to allow including struct kfifo in another data
structure. This requires changing the kfifo_alloc and kfifo_init
prototypes so that we pass an existing kfifo pointer into them. This
patch changes the implementation and all existing users.
[akpm@linux-foundation.org: fix warning]
Signed-off-by: Stefani Seibold <stefani@seibold.net>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
Acked-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Acked-by: Andi Kleen <ak@linux.intel.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-12-21 23:37:26 +01:00
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kfifo_reset(&dccpw.fifo);
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2008-04-21 23:28:45 +02:00
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getnstimeofday(&dccpw.tstart);
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2006-09-22 04:28:01 +02:00
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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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|
2007-06-01 06:33:35 +02:00
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if (!buf)
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2006-09-22 04:28:01 +02:00
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return -EINVAL;
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|
if (len == 0)
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|
return 0;
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|
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|
tbuf = vmalloc(len);
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|
if (!tbuf)
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|
return -ENOMEM;
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|
|
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error = wait_event_interruptible(dccpw.wait,
|
2009-12-21 23:37:28 +01:00
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kfifo_len(&dccpw.fifo) != 0);
|
2006-09-22 04:28:01 +02:00
|
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if (error)
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goto out_free;
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|
2009-12-21 23:37:27 +01:00
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cnt = kfifo_get_locked(&dccpw.fifo, tbuf, len, &dccpw.lock);
|
2008-04-25 10:49:48 +02:00
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error = copy_to_user(buf, tbuf, cnt) ? -EFAULT : 0;
|
2006-09-22 04:28:01 +02:00
|
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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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|
2007-02-12 09:55:35 +01:00
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static const struct file_operations dccpprobe_fops = {
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2006-09-22 04:28:01 +02:00
|
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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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|
|
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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);
|
2009-12-21 23:37:27 +01:00
|
|
|
if (kfifo_alloc(&dccpw.fifo, bufsize, GFP_KERNEL))
|
kfifo: move struct kfifo in place
This is a new generic kernel FIFO implementation.
The current kernel fifo API is not very widely used, because it has to
many constrains. Only 17 files in the current 2.6.31-rc5 used it.
FIFO's are like list's a very basic thing and a kfifo API which handles
the most use case would save a lot of development time and memory
resources.
I think this are the reasons why kfifo is not in use:
- The API is to simple, important functions are missing
- A fifo can be only allocated dynamically
- There is a requirement of a spinlock whether you need it or not
- There is no support for data records inside a fifo
So I decided to extend the kfifo in a more generic way without blowing up
the API to much. The new API has the following benefits:
- Generic usage: For kernel internal use and/or device driver.
- Provide an API for the most use case.
- Slim API: The whole API provides 25 functions.
- Linux style habit.
- DECLARE_KFIFO, DEFINE_KFIFO and INIT_KFIFO Macros
- Direct copy_to_user from the fifo and copy_from_user into the fifo.
- The kfifo itself is an in place member of the using data structure, this save an
indirection access and does not waste the kernel allocator.
- Lockless access: if only one reader and one writer is active on the fifo,
which is the common use case, no additional locking is necessary.
- Remove spinlock - give the user the freedom of choice what kind of locking to use if
one is required.
- Ability to handle records. Three type of records are supported:
- Variable length records between 0-255 bytes, with a record size
field of 1 bytes.
- Variable length records between 0-65535 bytes, with a record size
field of 2 bytes.
- Fixed size records, which no record size field.
- Preserve memory resource.
- Performance!
- Easy to use!
This patch:
Since most users want to have the kfifo as part of another object,
reorganize the code to allow including struct kfifo in another data
structure. This requires changing the kfifo_alloc and kfifo_init
prototypes so that we pass an existing kfifo pointer into them. This
patch changes the implementation and all existing users.
[akpm@linux-foundation.org: fix warning]
Signed-off-by: Stefani Seibold <stefani@seibold.net>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
Acked-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Acked-by: Andi Kleen <ak@linux.intel.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-12-21 23:37:26 +01:00
|
|
|
return ret;
|
2007-09-12 12:01:34 +02:00
|
|
|
if (!proc_net_fops_create(&init_net, procname, S_IRUSR, &dccpprobe_fops))
|
2006-09-22 04:28:01 +02:00
|
|
|
goto err0;
|
|
|
|
|
|
|
|
ret = register_jprobe(&dccp_send_probe);
|
|
|
|
if (ret)
|
|
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|
goto err1;
|
|
|
|
|
|
|
|
pr_info("DCCP watch registered (port=%d)\n", port);
|
|
|
|
return 0;
|
|
|
|
err1:
|
2007-09-12 12:01:34 +02:00
|
|
|
proc_net_remove(&init_net, procname);
|
2006-09-22 04:28:01 +02:00
|
|
|
err0:
|
kfifo: move struct kfifo in place
This is a new generic kernel FIFO implementation.
The current kernel fifo API is not very widely used, because it has to
many constrains. Only 17 files in the current 2.6.31-rc5 used it.
FIFO's are like list's a very basic thing and a kfifo API which handles
the most use case would save a lot of development time and memory
resources.
I think this are the reasons why kfifo is not in use:
- The API is to simple, important functions are missing
- A fifo can be only allocated dynamically
- There is a requirement of a spinlock whether you need it or not
- There is no support for data records inside a fifo
So I decided to extend the kfifo in a more generic way without blowing up
the API to much. The new API has the following benefits:
- Generic usage: For kernel internal use and/or device driver.
- Provide an API for the most use case.
- Slim API: The whole API provides 25 functions.
- Linux style habit.
- DECLARE_KFIFO, DEFINE_KFIFO and INIT_KFIFO Macros
- Direct copy_to_user from the fifo and copy_from_user into the fifo.
- The kfifo itself is an in place member of the using data structure, this save an
indirection access and does not waste the kernel allocator.
- Lockless access: if only one reader and one writer is active on the fifo,
which is the common use case, no additional locking is necessary.
- Remove spinlock - give the user the freedom of choice what kind of locking to use if
one is required.
- Ability to handle records. Three type of records are supported:
- Variable length records between 0-255 bytes, with a record size
field of 1 bytes.
- Variable length records between 0-65535 bytes, with a record size
field of 2 bytes.
- Fixed size records, which no record size field.
- Preserve memory resource.
- Performance!
- Easy to use!
This patch:
Since most users want to have the kfifo as part of another object,
reorganize the code to allow including struct kfifo in another data
structure. This requires changing the kfifo_alloc and kfifo_init
prototypes so that we pass an existing kfifo pointer into them. This
patch changes the implementation and all existing users.
[akpm@linux-foundation.org: fix warning]
Signed-off-by: Stefani Seibold <stefani@seibold.net>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
Acked-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Acked-by: Andi Kleen <ak@linux.intel.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-12-21 23:37:26 +01:00
|
|
|
kfifo_free(&dccpw.fifo);
|
2006-09-22 04:28:01 +02:00
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
module_init(dccpprobe_init);
|
|
|
|
|
|
|
|
static __exit void dccpprobe_exit(void)
|
|
|
|
{
|
kfifo: move struct kfifo in place
This is a new generic kernel FIFO implementation.
The current kernel fifo API is not very widely used, because it has to
many constrains. Only 17 files in the current 2.6.31-rc5 used it.
FIFO's are like list's a very basic thing and a kfifo API which handles
the most use case would save a lot of development time and memory
resources.
I think this are the reasons why kfifo is not in use:
- The API is to simple, important functions are missing
- A fifo can be only allocated dynamically
- There is a requirement of a spinlock whether you need it or not
- There is no support for data records inside a fifo
So I decided to extend the kfifo in a more generic way without blowing up
the API to much. The new API has the following benefits:
- Generic usage: For kernel internal use and/or device driver.
- Provide an API for the most use case.
- Slim API: The whole API provides 25 functions.
- Linux style habit.
- DECLARE_KFIFO, DEFINE_KFIFO and INIT_KFIFO Macros
- Direct copy_to_user from the fifo and copy_from_user into the fifo.
- The kfifo itself is an in place member of the using data structure, this save an
indirection access and does not waste the kernel allocator.
- Lockless access: if only one reader and one writer is active on the fifo,
which is the common use case, no additional locking is necessary.
- Remove spinlock - give the user the freedom of choice what kind of locking to use if
one is required.
- Ability to handle records. Three type of records are supported:
- Variable length records between 0-255 bytes, with a record size
field of 1 bytes.
- Variable length records between 0-65535 bytes, with a record size
field of 2 bytes.
- Fixed size records, which no record size field.
- Preserve memory resource.
- Performance!
- Easy to use!
This patch:
Since most users want to have the kfifo as part of another object,
reorganize the code to allow including struct kfifo in another data
structure. This requires changing the kfifo_alloc and kfifo_init
prototypes so that we pass an existing kfifo pointer into them. This
patch changes the implementation and all existing users.
[akpm@linux-foundation.org: fix warning]
Signed-off-by: Stefani Seibold <stefani@seibold.net>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
Acked-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Acked-by: Andi Kleen <ak@linux.intel.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-12-21 23:37:26 +01:00
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kfifo_free(&dccpw.fifo);
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2007-09-12 12:01:34 +02:00
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proc_net_remove(&init_net, procname);
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2006-09-22 04:28:01 +02:00
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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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