2009-02-20 02:55:14 -07:00
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/*
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* xt_LED.c - netfilter target to make LEDs blink upon packet matches
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*
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* Copyright (C) 2008 Adam Nielsen <a.nielsen@shikadi.net>
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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; version 2 of the License.
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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., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301 USA.
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*
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*/
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2010-03-17 09:04:40 -06:00
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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2009-02-20 02:55:14 -07:00
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#include <linux/module.h>
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#include <linux/skbuff.h>
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#include <linux/netfilter/x_tables.h>
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include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
percpu.h is included by sched.h and module.h and thus ends up being
included when building most .c files. percpu.h includes slab.h which
in turn includes gfp.h making everything defined by the two files
universally available and complicating inclusion dependencies.
percpu.h -> slab.h dependency is about to be removed. Prepare for
this change by updating users of gfp and slab facilities include those
headers directly instead of assuming availability. As this conversion
needs to touch large number of source files, the following script is
used as the basis of conversion.
http://userweb.kernel.org/~tj/misc/slabh-sweep.py
The script does the followings.
* Scan files for gfp and slab usages and update includes such that
only the necessary includes are there. ie. if only gfp is used,
gfp.h, if slab is used, slab.h.
* When the script inserts a new include, it looks at the include
blocks and try to put the new include such that its order conforms
to its surrounding. It's put in the include block which contains
core kernel includes, in the same order that the rest are ordered -
alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
doesn't seem to be any matching order.
* If the script can't find a place to put a new include (mostly
because the file doesn't have fitting include block), it prints out
an error message indicating which .h file needs to be added to the
file.
The conversion was done in the following steps.
1. The initial automatic conversion of all .c files updated slightly
over 4000 files, deleting around 700 includes and adding ~480 gfp.h
and ~3000 slab.h inclusions. The script emitted errors for ~400
files.
2. Each error was manually checked. Some didn't need the inclusion,
some needed manual addition while adding it to implementation .h or
embedding .c file was more appropriate for others. This step added
inclusions to around 150 files.
3. The script was run again and the output was compared to the edits
from #2 to make sure no file was left behind.
4. Several build tests were done and a couple of problems were fixed.
e.g. lib/decompress_*.c used malloc/free() wrappers around slab
APIs requiring slab.h to be added manually.
5. The script was run on all .h files but without automatically
editing them as sprinkling gfp.h and slab.h inclusions around .h
files could easily lead to inclusion dependency hell. Most gfp.h
inclusion directives were ignored as stuff from gfp.h was usually
wildly available and often used in preprocessor macros. Each
slab.h inclusion directive was examined and added manually as
necessary.
6. percpu.h was updated not to include slab.h.
7. Build test were done on the following configurations and failures
were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my
distributed build env didn't work with gcov compiles) and a few
more options had to be turned off depending on archs to make things
build (like ipr on powerpc/64 which failed due to missing writeq).
* x86 and x86_64 UP and SMP allmodconfig and a custom test config.
* powerpc and powerpc64 SMP allmodconfig
* sparc and sparc64 SMP allmodconfig
* ia64 SMP allmodconfig
* s390 SMP allmodconfig
* alpha SMP allmodconfig
* um on x86_64 SMP allmodconfig
8. percpu.h modifications were reverted so that it could be applied as
a separate patch and serve as bisection point.
Given the fact that I had only a couple of failures from tests on step
6, I'm fairly confident about the coverage of this conversion patch.
If there is a breakage, it's likely to be something in one of the arch
headers which should be easily discoverable easily on most builds of
the specific arch.
Signed-off-by: Tejun Heo <tj@kernel.org>
Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 02:04:11 -06:00
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#include <linux/slab.h>
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2009-02-20 02:55:14 -07:00
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#include <linux/leds.h>
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#include <linux/mutex.h>
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#include <linux/netfilter/xt_LED.h>
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Adam Nielsen <a.nielsen@shikadi.net>");
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MODULE_DESCRIPTION("Xtables: trigger LED devices on packet match");
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2010-04-09 08:51:40 -06:00
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static LIST_HEAD(xt_led_triggers);
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static DEFINE_MUTEX(xt_led_mutex);
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2009-02-20 02:55:14 -07:00
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/*
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* This is declared in here (the kernel module) only, to avoid having these
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* dependencies in userspace code. This is what xt_led_info.internal_data
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* points to.
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*/
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struct xt_led_info_internal {
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2010-04-09 08:51:40 -06:00
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struct list_head list;
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int refcnt;
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char *trigger_id;
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2009-02-20 02:55:14 -07:00
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struct led_trigger netfilter_led_trigger;
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struct timer_list timer;
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};
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static unsigned int
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2009-07-05 11:43:26 -06:00
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led_tg(struct sk_buff *skb, const struct xt_action_param *par)
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2009-02-20 02:55:14 -07:00
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{
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const struct xt_led_info *ledinfo = par->targinfo;
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struct xt_led_info_internal *ledinternal = ledinfo->internal_data;
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/*
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* If "always blink" is enabled, and there's still some time until the
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* LED will switch off, briefly switch it off now.
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*/
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if ((ledinfo->delay > 0) && ledinfo->always_blink &&
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timer_pending(&ledinternal->timer))
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2010-04-09 08:51:40 -06:00
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led_trigger_event(&ledinternal->netfilter_led_trigger, LED_OFF);
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2009-02-20 02:55:14 -07:00
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led_trigger_event(&ledinternal->netfilter_led_trigger, LED_FULL);
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/* If there's a positive delay, start/update the timer */
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if (ledinfo->delay > 0) {
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mod_timer(&ledinternal->timer,
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jiffies + msecs_to_jiffies(ledinfo->delay));
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/* Otherwise if there was no delay given, blink as fast as possible */
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} else if (ledinfo->delay == 0) {
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led_trigger_event(&ledinternal->netfilter_led_trigger, LED_OFF);
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}
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/* else the delay is negative, which means switch on and stay on */
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return XT_CONTINUE;
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}
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static void led_timeout_callback(unsigned long data)
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{
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2010-04-09 08:51:40 -06:00
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struct xt_led_info_internal *ledinternal = (struct xt_led_info_internal *)data;
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2009-02-20 02:55:14 -07:00
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led_trigger_event(&ledinternal->netfilter_led_trigger, LED_OFF);
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}
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2010-04-09 08:51:40 -06:00
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static struct xt_led_info_internal *led_trigger_lookup(const char *name)
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{
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struct xt_led_info_internal *ledinternal;
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list_for_each_entry(ledinternal, &xt_led_triggers, list) {
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if (!strcmp(name, ledinternal->netfilter_led_trigger.name)) {
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return ledinternal;
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}
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}
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return NULL;
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}
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2010-03-19 10:16:42 -06:00
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static int led_tg_check(const struct xt_tgchk_param *par)
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2009-02-20 02:55:14 -07:00
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{
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struct xt_led_info *ledinfo = par->targinfo;
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struct xt_led_info_internal *ledinternal;
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int err;
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if (ledinfo->id[0] == '\0') {
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2010-03-17 09:04:40 -06:00
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pr_info("No 'id' parameter given.\n");
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2010-03-25 09:34:45 -06:00
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return -EINVAL;
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2009-02-20 02:55:14 -07:00
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}
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2010-04-09 08:51:40 -06:00
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mutex_lock(&xt_led_mutex);
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ledinternal = led_trigger_lookup(ledinfo->id);
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if (ledinternal) {
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ledinternal->refcnt++;
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goto out;
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}
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err = -ENOMEM;
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2009-02-20 02:55:14 -07:00
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ledinternal = kzalloc(sizeof(struct xt_led_info_internal), GFP_KERNEL);
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2010-03-17 17:27:03 -06:00
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if (!ledinternal)
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2010-04-09 08:51:40 -06:00
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goto exit_mutex_only;
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ledinternal->trigger_id = kstrdup(ledinfo->id, GFP_KERNEL);
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if (!ledinternal->trigger_id)
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goto exit_internal_alloc;
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2009-02-20 02:55:14 -07:00
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2010-04-09 08:51:40 -06:00
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ledinternal->refcnt = 1;
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ledinternal->netfilter_led_trigger.name = ledinternal->trigger_id;
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2009-02-20 02:55:14 -07:00
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err = led_trigger_register(&ledinternal->netfilter_led_trigger);
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if (err) {
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2010-03-17 09:04:40 -06:00
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pr_warning("led_trigger_register() failed\n");
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2009-02-20 02:55:14 -07:00
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if (err == -EEXIST)
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2010-03-17 09:04:40 -06:00
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pr_warning("Trigger name is already in use.\n");
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2009-02-20 02:55:14 -07:00
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goto exit_alloc;
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}
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/* See if we need to set up a timer */
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if (ledinfo->delay > 0)
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setup_timer(&ledinternal->timer, led_timeout_callback,
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2010-04-09 08:51:40 -06:00
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(unsigned long)ledinternal);
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list_add_tail(&ledinternal->list, &xt_led_triggers);
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out:
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mutex_unlock(&xt_led_mutex);
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2009-02-20 02:55:14 -07:00
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ledinfo->internal_data = ledinternal;
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2010-04-09 08:51:40 -06:00
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2010-03-25 09:34:45 -06:00
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return 0;
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2009-02-20 02:55:14 -07:00
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exit_alloc:
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2010-04-09 08:51:40 -06:00
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kfree(ledinternal->trigger_id);
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exit_internal_alloc:
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2009-02-20 02:55:14 -07:00
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kfree(ledinternal);
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2010-04-09 08:51:40 -06:00
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exit_mutex_only:
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mutex_unlock(&xt_led_mutex);
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2010-03-19 10:32:59 -06:00
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return err;
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2009-02-20 02:55:14 -07:00
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}
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static void led_tg_destroy(const struct xt_tgdtor_param *par)
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{
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const struct xt_led_info *ledinfo = par->targinfo;
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struct xt_led_info_internal *ledinternal = ledinfo->internal_data;
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2010-04-09 08:51:40 -06:00
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mutex_lock(&xt_led_mutex);
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if (--ledinternal->refcnt) {
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mutex_unlock(&xt_led_mutex);
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return;
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}
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list_del(&ledinternal->list);
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2009-02-20 02:55:14 -07:00
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if (ledinfo->delay > 0)
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del_timer_sync(&ledinternal->timer);
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led_trigger_unregister(&ledinternal->netfilter_led_trigger);
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2010-04-09 08:51:40 -06:00
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mutex_unlock(&xt_led_mutex);
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kfree(ledinternal->trigger_id);
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2009-02-20 02:55:14 -07:00
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kfree(ledinternal);
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}
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static struct xt_target led_tg_reg __read_mostly = {
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.name = "LED",
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.revision = 0,
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.family = NFPROTO_UNSPEC,
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.target = led_tg,
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2010-03-09 15:27:24 -07:00
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.targetsize = sizeof(struct xt_led_info),
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2009-02-20 02:55:14 -07:00
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.checkentry = led_tg_check,
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.destroy = led_tg_destroy,
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.me = THIS_MODULE,
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};
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static int __init led_tg_init(void)
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{
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return xt_register_target(&led_tg_reg);
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}
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static void __exit led_tg_exit(void)
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{
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xt_unregister_target(&led_tg_reg);
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}
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module_init(led_tg_init);
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module_exit(led_tg_exit);
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