// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * net/sched/em_nbyte.c	N-Byte ematch
 *
 * Authors:	Thomas Graf <tgraf@suug.ch>
 */

#include <linux/gfp.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/skbuff.h>
#include <linux/tc_ematch/tc_em_nbyte.h>
#include <net/pkt_cls.h>

struct nbyte_data {
	struct tcf_em_nbyte	hdr;
	char			pattern[];
};

static int em_nbyte_change(struct net *net, void *data, int data_len,
			   struct tcf_ematch *em)
{
	struct tcf_em_nbyte *nbyte = data;

	if (data_len < sizeof(*nbyte) ||
	    data_len < (sizeof(*nbyte) + nbyte->len))
		return -EINVAL;

	em->datalen = sizeof(*nbyte) + nbyte->len;
	em->data = (unsigned long)kmemdup(data, em->datalen, GFP_KERNEL);
	if (em->data == 0UL)
		return -ENOMEM;

	return 0;
}

static int em_nbyte_match(struct sk_buff *skb, struct tcf_ematch *em,
			  struct tcf_pkt_info *info)
{
	struct nbyte_data *nbyte = (struct nbyte_data *) em->data;
	unsigned char *ptr = tcf_get_base_ptr(skb, nbyte->hdr.layer);

	ptr += nbyte->hdr.off;

	if (!tcf_valid_offset(skb, ptr, nbyte->hdr.len))
		return 0;

	return !memcmp(ptr, nbyte->pattern, nbyte->hdr.len);
}

static struct tcf_ematch_ops em_nbyte_ops = {
	.kind	  = TCF_EM_NBYTE,
	.change	  = em_nbyte_change,
	.match	  = em_nbyte_match,
	.owner	  = THIS_MODULE,
	.link	  = LIST_HEAD_INIT(em_nbyte_ops.link)
};

static int __init init_em_nbyte(void)
{
	return tcf_em_register(&em_nbyte_ops);
}

static void __exit exit_em_nbyte(void)
{
	tcf_em_unregister(&em_nbyte_ops);
}

MODULE_LICENSE("GPL");

module_init(init_em_nbyte);
module_exit(exit_em_nbyte);

MODULE_ALIAS_TCF_EMATCH(TCF_EM_NBYTE);
'/drm-misc/tree/kernel/async.c'>tree</a><a href='/drm-misc/commit/kernel/async.c'>commit</a><a href='/drm-misc/diff/kernel/async.c'>diff</a></td><td class='form'><form class='right' method='get' action='/drm-misc/log/kernel/async.c'>
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<div class='path'>path: <a href='/drm-misc/log/'>root</a>/<a href='/drm-misc/log/kernel'>kernel</a>/<a href='/drm-misc/log/kernel/async.c'>async.c</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/drm-misc/log/kernel/async.c?showmsg=1'>Expand</a>)</th><th class='left'>Author</th><th class='left'>Files</th><th class='left'>Lines</th></tr>
<tr><td><span title='2024-02-09 11:13:59 -1000'>2024-02-09</span></td><td><a href='/drm-misc/commit/kernel/async.c?id=bf52b1ac6ab41a060511d56d0f2da12f3a2486db'>async: Use a dedicated unbound workqueue with raised min_active</a></td><td>Tejun Heo</td><td>1</td><td><span class='deletions'>-1</span>/<span class='insertions'>+16</span></td></tr>
<tr><td><span title='2024-01-10 16:43:55 -0800'>2024-01-10</span></td><td><a href='/drm-misc/commit/kernel/async.c?id=78273df7f646f8daf2604ec714bea0897cd03aae'>Merge tag 'header_cleanup-2024-01-10' of https://evilpiepirate.org/git/bcachefs</a></td><td>Linus Torvalds</td><td>1</td><td><span class='deletions'>-2</span>/<span class='insertions'>+3</span></td></tr>
<tr><td><span title='2024-01-03 11:31:12 +0100'>2024-01-03</span></td><td><a href='/drm-misc/commit/kernel/async.c?id=7d4b5d7a37bdd63a5a3371b988744b060d5bb86f'>async: Introduce async_schedule_dev_nocall()</a></td><td>Rafael J. Wysocki</td><td>1</td><td><span class='deletions'>-0</span>/<span class='insertions'>+29</span></td></tr>
<tr><td><span title='2024-01-03 11:29:58 +0100'>2024-01-03</span></td><td><a href='/drm-misc/commit/kernel/async.c?id=6aa09a5bccd8e224d917afdb4c278fc66aacde4d'>async: Split async_schedule_node_domain()</a></td><td>Rafael J. Wysocki</td><td>1</td><td><span class='deletions'>-22</span>/<span class='insertions'>+34</span></td></tr>
<tr><td><span title='2023-12-20 19:26:31 -0500'>2023-12-20</span></td><td><a href='/drm-misc/commit/kernel/async.c?id=f551103cb964e9e6f5c03b3b8723424723731e76'>sched.h: move pid helpers to pid.h</a></td><td>Kent Overstreet</td><td>1</td><td><span class='deletions'>-2</span>/<span class='insertions'>+3</span></td></tr>
<tr><td><span title='2022-02-03 11:20:34 -0800'>2022-02-03</span></td><td><a href='/drm-misc/commit/kernel/async.c?id=67d6212afda218d564890d1674bab28e8612170f'>Revert "module, async: async_synchronize_full() on module init iff async is u...</a></td><td>Igor Pylypiv</td><td>1</td><td><span class='deletions'>-3</span>/<span class='insertions'>+0</span></td></tr>
<tr><td><span title='2021-05-07 00:26:33 -0700'>2021-05-07</span></td><td><a href='/drm-misc/commit/kernel/async.c?id=a065c0faacb1e472cd4e048986407d1b177373a2'>kernel/async.c: remove async_unregister_domain()</a></td><td>Rasmus Villemoes</td><td>1</td><td><span class='deletions'>-18</span>/<span class='insertions'>+0</span></td></tr>
<tr><td><span title='2021-05-07 00:26:33 -0700'>2021-05-07</span></td><td><a href='/drm-misc/commit/kernel/async.c?id=07416af11dd85ca61abe60155ace37ced1233617'>kernel/async.c: stop guarding pr_debug() statements</a></td><td>Rasmus Villemoes</td><td>1</td><td><span class='deletions'>-28</span>/<span class='insertions'>+20</span></td></tr>
<tr><td><span title='2021-05-06 19:24:11 -0700'>2021-05-06</span></td><td><a href='/drm-misc/commit/kernel/async.c?id=8ba9d40b6b2bf62377fd6fce25e9997e42b0317a'>kernel/async.c: fix pr_debug statement</a></td><td>Rasmus Villemoes</td><td>1</td><td><span class='deletions'>-1</span>/<span class='insertions'>+1</span></td></tr>
<tr><td><span title='2020-07-16 12:35:15 -0700'>2020-07-16</span></td><td><a href='/drm-misc/commit/kernel/async.c?id=3f649ab728cda8038259d8f14492fe400fbab911'>treewide: Remove uninitialized_var() usage</a></td><td>Kees Cook</td><td>1</td><td><span class='deletions'>-2</span>/<span class='insertions'>+2</span></td></tr>
<tr><td><span title='2019-06-05 17:37:17 +0200'>2019-06-05</span></td><td><a href='/drm-misc/commit/kernel/async.c?id=b886d83c5b621abc84ff9616f14c529be3f6b147'>treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 441</a></td><td>Thomas Gleixner</td><td>1</td><td><span class='deletions'>-5</span>/<span class='insertions'>+1</span></td></tr>
<tr><td><span title='2019-04-09 14:19:06 +0200'>2019-04-09</span></td><td><a href='/drm-misc/commit/kernel/async.c?id=d75f773c86a2b8b7278e2c33343b46a4024bc002'>treewide: Switch printk users from %pf and %pF to %ps and %pS, respectively</a></td><td>Sakari Ailus</td><td>1</td><td><span class='deletions'>-2</span>/<span class='insertions'>+2</span></td></tr>
<tr><td><span title='2019-01-31 14:20:54 +0100'>2019-01-31</span></td><td><a href='/drm-misc/commit/kernel/async.c?id=6be9238e5cb64741ff95c3ae440b112753ad93de'>async: Add support for queueing on specific NUMA node</a></td><td>Alexander Duyck</td><td>1</td><td><span class='deletions'>-24</span>/<span class='insertions'>+29</span></td></tr>
<tr><td><span title='2018-02-06 18:32:44 -0800'>2018-02-06</span></td><td><a href='/drm-misc/commit/kernel/async.c?id=4f7e988e63e336827f4150de48163bed05d653bd'>kernel/async.c: revert "async: simplify lowest_in_progress()"</a></td><td>Rasmus Villemoes</td><td>1</td><td><span class='deletions'>-8</span>/<span class='insertions'>+12</span></td></tr>
<tr><td><span title='2017-05-23 10:01:37 +0200'>2017-05-23</span></td><td><a href='/drm-misc/commit/kernel/async.c?id=b4def42724594cd399cfee365221f5b38639711d'>async: Adjust system_state checks</a></td><td>Thomas Gleixner</td><td>1</td><td><span class='deletions'>-4</span>/<span class='insertions'>+4</span></td></tr>
<tr><td><span title='2015-11-19 17:51:48 +0100'>2015-11-19</span></td><td><a href='/drm-misc/commit/kernel/async.c?id=581da2cab557fa6e8a954c148c487eb7e0658979'>async: export current_is_async()</a></td><td>Lukas Wunner</td><td>1</td><td><span class='deletions'>-0</span>/<span class='insertions'>+1</span></td></tr>
<tr><td><span title='2014-10-09 22:26:04 -0400'>2014-10-09</span></td><td><a href='/drm-misc/commit/kernel/async.c?id=27fb10edcacbb70ac4e97fe1506006d732421210'>kernel/async.c: switch to pr_foo()</a></td><td>Ionut Alexa</td><td>1</td><td><span class='deletions'>-4</span>/<span class='insertions'>+4</span></td></tr>
<tr><td><span title='2013-03-12 13:59:14 -0700'>2013-03-12</span></td><td><a href='/drm-misc/commit/kernel/async.c?id=362f2b098b188ede9c4350cc20e58040dbfa515e'>async: rename and redefine async_func_ptr</a></td><td>Lai Jiangshan</td><td>1</td><td><span class='deletions'>-10</span>/<span class='insertions'>+10</span></td></tr>
<tr><td><span title='2013-03-12 13:59:13 -0700'>2013-03-12</span></td><td><a href='/drm-misc/commit/kernel/async.c?id=92266d6ef60c2381c980c6cdcb2a5c1667b36b49'>async: simplify lowest_in_progress()</a></td><td>Lai Jiangshan</td><td>1</td><td><span class='deletions'>-12</span>/<span class='insertions'>+8</span></td></tr>
<tr><td><span title='2013-01-25 09:14:48 -0800'>2013-01-25</span></td><td><a href='/drm-misc/commit/kernel/async.c?id=a0327ff0eda915be623658babacef706099c11a8'>async: initialise list heads to fix crash</a></td><td>James Hogan</td><td>1</td><td><span class='deletions'>-0</span>/<span class='insertions'>+2</span></td></tr>
<tr><td><span title='2013-01-23 09:32:30 -0800'>2013-01-23</span></td><td><a href='/drm-misc/commit/kernel/async.c?id=9fdb04cdc5566d6ba68283a0bebe49667ca0b0e8'>async: replace list of active domains with global list of pending items</a></td><td>Tejun Heo</td><td>1</td><td><span class='deletions'>-34</span>/<span class='insertions'>+29</span></td></tr>
<tr><td><span title='2013-01-23 09:32:30 -0800'>2013-01-23</span></td><td><a href='/drm-misc/commit/kernel/async.c?id=52722794d6a48162fd8906d54618ae60a4abdb21'>async: keep pending tasks on async_domain and remove async_pending</a></td><td>Tejun Heo</td><td>1</td><td><span class='deletions'>-49</span>/<span class='insertions'>+14</span></td></tr>
<tr><td><span title='2013-01-23 09:32:30 -0800'>2013-01-23</span></td><td><a href='/drm-misc/commit/kernel/async.c?id=c68eee14ec2da345e86f2778c8570759309a4a2e'>async: use ULLONG_MAX for infinity cookie value</a></td><td>Tejun Heo</td><td>1</td><td><span class='deletions'>-5</span>/<span class='insertions'>+6</span></td></tr>
<tr><td><span title='2013-01-23 09:32:30 -0800'>2013-01-23</span></td><td><a href='/drm-misc/commit/kernel/async.c?id=8723d5037cafea09c7242303c6c8e5d7058cec61'>async: bring sanity to the use of words domain and running</a></td><td>Tejun Heo</td><td>1</td><td><span class='deletions'>-34</span>/<span class='insertions'>+34</span></td></tr>
<tr><td><span title='2013-01-23 09:31:01 -0800'>2013-01-23</span></td><td><a href='/drm-misc/commit/kernel/async.c?id=c14afb82ffff5903a701a9fb737ac20f36d1f755'>Merge branch 'master' into for-3.9-async</a></td><td>Tejun Heo</td><td>1</td><td><span class='deletions'>-7</span>/<span class='insertions'>+23</span></td></tr>
<tr><td><span title='2013-01-22 16:21:24 -0800'>2013-01-22</span></td><td><a href='/drm-misc/commit/kernel/async.c?id=f56c3196f251012de9b3ebaff55732a9074fdaae'>async: fix __lowest_in_progress()</a></td><td>Tejun Heo</td><td>1</td><td><span class='deletions'>-7</span>/<span class='insertions'>+20</span></td></tr>
<tr><td><span title='2013-01-18 14:05:56 -0800'>2013-01-18</span></td><td><a href='/drm-misc/commit/kernel/async.c?id=84b233adcca3cacd5cfa8013a5feda7a3db4a9af'>workqueue: implement current_is_async()</a></td><td>Tejun Heo</td><td>1</td><td><span class='deletions'>-0</span>/<span class='insertions'>+14</span></td></tr>
<tr><td><span title='2013-01-16 09:05:33 -0800'>2013-01-16</span></td><td><a href='/drm-misc/commit/kernel/async.c?id=774a1221e862b343388347bac9b318767336b20b'>module, async: async_synchronize_full() on module init iff async is used</a></td><td>Tejun Heo</td><td>1</td><td><span class='deletions'>-0</span>/<span class='insertions'>+3</span></td></tr>
<tr><td><span title='2012-07-20 09:07:37 +0100'>2012-07-20</span></td><td><a href='/drm-misc/commit/kernel/async.c?id=a4683487f90bfe3049686fc5c566bdc1ad03ace6'>[SCSI] async: make async_synchronize_full() flush all work regardless of domain</a></td><td>Dan Williams</td><td>1</td><td><span class='deletions'>-2</span>/<span class='insertions'>+41</span></td></tr>
<tr><td><span title='2012-07-20 09:05:54 +0100'>2012-07-20</span></td><td><a href='/drm-misc/commit/kernel/async.c?id=2955b47d2c1983998a8c5915cb96884e67f7cb53'>[SCSI] async: introduce 'async_domain' type</a></td><td>Dan Williams</td><td>1</td><td><span class='deletions'>-18</span>/<span class='insertions'>+17</span></td></tr>
<tr><td><span title='2012-01-13 09:32:18 +1030'>2012-01-13</span></td><td><a href='/drm-misc/commit/kernel/async.c?id=6d6a55ec0877393f467067d44b9a2a8c2e4a82d2'>kernel/async: remove redundant declaration.</a></td><td>Rusty Russell</td><td>1</td><td><span class='deletions'>-2</span>/<span class='insertions'>+0</span></td></tr>
<tr><td><span title='2011-10-31 09:20:12 -0400'>2011-10-31</span></td><td><a href='/drm-misc/commit/kernel/async.c?id=9984de1a5a8a96275fcab818f7419af5a3c86e71'>kernel: Map most files to use export.h instead of module.h</a></td><td>Paul Gortmaker</td><td>1</td><td><span class='deletions'>-1</span>/<span class='insertions'>+1</span></td></tr>
<tr><td><span title='2011-09-15 14:22:28 +0200'>2011-09-15</span></td><td><a href='/drm-misc/commit/kernel/async.c?id=124ff4e53ace98300bf7465e0285167a3df838d3'>async: uninitialized warning corrections</a></td><td>Vitaliy Ivanov</td><td>1</td><td><span class='deletions'>-2</span>/<span class='insertions'>+2</span></td></tr>
<tr><td><span title='2011-06-14 22:48:46 -0400'>2011-06-14</span></td><td><a href='/drm-misc/commit/kernel/async.c?id=84c15027a7f2fbd7f1180d7cbb60e41abbbaedd2'>async: Fixed an include coding style issue</a></td><td>Paul McQuade</td><td>1</td><td><span class='deletions'>-5</span>/<span class='insertions'>+7</span></td></tr>
<tr><td><span title='2010-07-14 11:29:46 +0200'>2010-07-14</span></td><td><a href='/drm-misc/commit/kernel/async.c?id=083b804c4d3e1e3d0eace56bdbc0f674946d2847'>async: use workqueue for worker pool</a></td><td>Tejun Heo</td><td>1</td><td><span class='deletions'>-119</span>/<span class='insertions'>+22</span></td></tr>
<tr><td><span title='2010-03-30 22:02:32 +0900'>2010-03-30</span></td><td><a href='/drm-misc/commit/kernel/async.c?id=5a0e3ad6af8660be21ca98a971cd00f331318c05'>include cleanup: Update gfp.h and slab.h includes to prepare for breaking imp...</a></td><td>Tejun Heo</td><td>1</td><td><span class='deletions'>-0</span>/<span class='insertions'>+1</span></td></tr>
<tr><td><span title='2009-06-08 12:31:53 -0700'>2009-06-08</span></td><td><a href='/drm-misc/commit/kernel/async.c?id=3af968e066d593bc4dacc021715f3e95ddf0996f'>async: Fix lack of boot-time console due to insufficient synchronization</a></td><td>Linus Torvalds</td><td>1</td><td><span class='deletions'>-10</span>/<span class='insertions'>+5</span></td></tr>
<tr><td><span title='2009-05-24 13:38:41 -0700'>2009-05-24</span></td><td><a href='/drm-misc/commit/kernel/async.c?id=d5a877e8dd409d8c702986d06485c374b705d340'>async: make sure independent async domains can't accidentally entangle</a></td><td>James Bottomley</td><td>1</td><td><span class='deletions'>-8</span>/<span class='insertions'>+12</span></td></tr>
<tr><td><span title='2009-03-28 13:05:30 -0700'>2009-03-28</span></td><td><a href='/drm-misc/commit/kernel/async.c?id=9710794383ee5008d67f1a6613a4717bf6de47bc'>async: remove the temporary (2.6.29) "async is off by default" code</a></td><td>Arjan van de Ven</td><td>1</td><td><span class='deletions'>-13</span>/<span class='insertions'>+5</span></td></tr>
<tr><td><span title='2009-02-08 10:00:26 -0800'>2009-02-08</span></td><td><a href='/drm-misc/commit/kernel/async.c?id=f7de7621f07495ad14fb23a812003bcf8f6af65a'>async: use list_move_tail</a></td><td>Stefan Richter</td><td>1</td><td><span class='deletions'>-2</span>/<span class='insertions'>+1</span></td></tr>
<tr><td><span title='2009-02-08 09:56:11 -0800'>2009-02-08</span></td><td><a href='/drm-misc/commit/kernel/async.c?id=766ccb9ed406c230d13c145def08ebea1b932982'>async: Rename _special -&gt; _domain for clarity.</a></td><td>Cornelia Huck</td><td>1</td><td><span class='deletions'>-19</span>/<span class='insertions'>+22</span></td></tr>
<tr><td><span title='2009-02-08 09:56:11 -0800'>2009-02-08</span></td><td><a href='/drm-misc/commit/kernel/async.c?id=f30d5b307c694e03368ab55f2f96b0ca4131e775'>async: Add some documentation.</a></td><td>Cornelia Huck</td><td>1</td><td><span class='deletions'>-0</span>/<span class='insertions'>+47</span></td></tr>
<tr><td><span title='2009-02-08 09:56:10 -0800'>2009-02-08</span></td><td><a href='/drm-misc/commit/kernel/async.c?id=86532d8b167e71e24da8b564348b52977b76d15f'>async: Handle kthread_run() return codes.</a></td><td>Cornelia Huck</td><td>1</td><td><span class='deletions'>-2</span>/<span class='insertions'>+9</span></td></tr>
<tr><td><span title='2009-02-08 09:56:10 -0800'>2009-02-08</span></td><td><a href='/drm-misc/commit/kernel/async.c?id=7a89bbc74937cd74a6bcf109cfc7c032109639be'>async: Fix running list handling.</a></td><td>Cornelia Huck</td><td>1</td><td><span class='deletions'>-2</span>/<span class='insertions'>+2</span></td></tr>
<tr><td><span title='2009-02-05 12:56:46 -0800'>2009-02-05</span></td><td><a href='/drm-misc/commit/kernel/async.c?id=58763a297405024d23d8f1d0bba3e6603660c4b6'>kernel/async.c: fix printk warnings</a></td><td>Andrew Morton</td><td>1</td><td><span class='deletions'>-4</span>/<span class='insertions'>+8</span></td></tr>
<tr><td><span title='2009-01-12 16:39:58 -0800'>2009-01-12</span></td><td><a href='/drm-misc/commit/kernel/async.c?id=37a76bd4f1b716949fc38a6842e89f0ccb8384d0'>async: fix __lowest_in_progress()</a></td><td>Arjan van de Ven</td><td>1</td><td><span class='deletions'>-5</span>/<span class='insertions'>+16</span></td></tr>
<tr><td><span title='2009-01-09 13:23:45 -0800'>2009-01-09</span></td><td><a href='/drm-misc/commit/kernel/async.c?id=cdb80f630be5cbc23d82331f24dc4704f75b64f4'>async: make async a command line option for now</a></td><td>Arjan van de Ven</td><td>1</td><td><span class='deletions'>-2</span>/<span class='insertions'>+14</span></td></tr>
<tr><td><span title='2009-01-08 12:58:09 -0800'>2009-01-08</span></td><td><a href='/drm-misc/commit/kernel/async.c?id=33b04b9308959af7febc1c111c766fa3fd8b1934'>async: make async_synchronize_full() more serializing</a></td><td>Arjan van de Ven</td><td>1</td><td><span class='deletions'>-1</span>/<span class='insertions'>+3</span></td></tr>
<tr><td><span title='2009-01-07 09:31:49 -0800'>2009-01-07</span></td><td><a href='/drm-misc/commit/kernel/async.c?id=ad160d23198193135cb2bcc75222e0816b5838c0'>async: don't do the initcall stuff post boot</a></td><td>Arjan van de Ven</td><td>1</td><td><span class='deletions'>-4</span>/<span class='insertions'>+4</span></td></tr>
<tr><td><span title='2009-01-07 08:45:46 -0800'>2009-01-07</span></td><td><a href='/drm-misc/commit/kernel/async.c?id=22a9d645677feefd402befd02edd59b122289ef1'>async: Asynchronous function calls to speed up kernel boot</a></td><td>Arjan van de Ven</td><td>1</td><td><span class='deletions'>-0</span>/<span class='insertions'>+321</span></td></tr>
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