/*
 * decompress.c
 *
 * Detect the decompression method based on magic number
 */

#include <linux/decompress/generic.h>

#include <linux/decompress/bunzip2.h>
#include <linux/decompress/unlzma.h>
#include <linux/decompress/unxz.h>
#include <linux/decompress/inflate.h>
#include <linux/decompress/unlzo.h>
#include <linux/decompress/unlz4.h>

#include <linux/types.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/printk.h>

#ifndef CONFIG_DECOMPRESS_GZIP
# define gunzip NULL
#endif
#ifndef CONFIG_DECOMPRESS_BZIP2
# define bunzip2 NULL
#endif
#ifndef CONFIG_DECOMPRESS_LZMA
# define unlzma NULL
#endif
#ifndef CONFIG_DECOMPRESS_XZ
# define unxz NULL
#endif
#ifndef CONFIG_DECOMPRESS_LZO
# define unlzo NULL
#endif
#ifndef CONFIG_DECOMPRESS_LZ4
# define unlz4 NULL
#endif

struct compress_format {
	unsigned char magic[2];
	const char *name;
	decompress_fn decompressor;
};

static const struct compress_format compressed_formats[] __initconst = {
	{ {0x1f, 0x8b}, "gzip", gunzip },
	{ {0x1f, 0x9e}, "gzip", gunzip },
	{ {0x42, 0x5a}, "bzip2", bunzip2 },
	{ {0x5d, 0x00}, "lzma", unlzma },
	{ {0xfd, 0x37}, "xz", unxz },
	{ {0x89, 0x4c}, "lzo", unlzo },
	{ {0x02, 0x21}, "lz4", unlz4 },
	{ {0, 0}, NULL, NULL }
};

decompress_fn __init decompress_method(const unsigned char *inbuf, long len,
				const char **name)
{
	const struct compress_format *cf;

	if (len < 2) {
		if (name)
			*name = NULL;
		return NULL;	/* Need at least this much... */
	}

	pr_debug("Compressed data magic: %#.2x %#.2x\n", inbuf[0], inbuf[1]);

	for (cf = compressed_formats; cf->name; cf++) {
		if (!memcmp(inbuf, cf->magic, 2))
			break;

	}
	if (name)
		*name = cf->name;
	return cf->decompressor;
}
it/log/net/netfilter'>log</a><a href='/cgit.cgi/linux/net-next.git/tree/net/netfilter?id=303223092081963513494b4377fa1ac9e362ed4b'>tree</a><a class='active' href='/cgit.cgi/linux/net-next.git/commit/net/netfilter?id=303223092081963513494b4377fa1ac9e362ed4b'>commit</a><a href='/cgit.cgi/linux/net-next.git/diff/net/netfilter?id=303223092081963513494b4377fa1ac9e362ed4b'>diff</a></td><td class='form'><form class='right' method='get' action='/cgit.cgi/linux/net-next.git/log/net/netfilter'>
<input type='hidden' name='id' value='303223092081963513494b4377fa1ac9e362ed4b'/><select name='qt'>
<option value='grep'>log msg</option>
<option value='author'>author</option>
<option value='committer'>committer</option>
<option value='range'>range</option>
</select>
<input class='txt' type='search' size='10' name='q' value=''/>
<input type='submit' value='search'/>
</form>
</td></tr></table>
<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/commit/?id=303223092081963513494b4377fa1ac9e362ed4b'>root</a>/<a href='/cgit.cgi/linux/net-next.git/commit/net?id=303223092081963513494b4377fa1ac9e362ed4b'>net</a>/<a href='/cgit.cgi/linux/net-next.git/commit/net/netfilter?id=303223092081963513494b4377fa1ac9e362ed4b'>netfilter</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='303223092081963513494b4377fa1ac9e362ed4b'/><table><tr><td colspan='2'/></tr><tr><td class='label'>context:</td><td class='ctrl'><select name='context' onchange='this.form.submit();'><option value='1'>1</option><option value='2'>2</option><option value='3' selected='selected'>3</option><option value='4'>4</option><option value='5'>5</option><option value='6'>6</option><option value='7'>7</option><option value='8'>8</option><option value='9'>9</option><option value='10'>10</option><option value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Florian Westphal &lt;fw@strlen.de&gt;</td><td class='right'>2017-01-23 18:21:58 +0100</td></tr>
<tr><th>committer</th><td>Pablo Neira Ayuso &lt;pablo@netfilter.org&gt;</td><td class='right'>2017-02-02 14:31:55 +0100</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/netfilter?id=303223092081963513494b4377fa1ac9e362ed4b'>303223092081963513494b4377fa1ac9e362ed4b</a> (<a href='/cgit.cgi/linux/net-next.git/patch/net/netfilter?id=303223092081963513494b4377fa1ac9e362ed4b'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=303223092081963513494b4377fa1ac9e362ed4b'>e312cf241ada3f96d5844613770ebbeeb152585c</a> /<a href='/cgit.cgi/linux/net-next.git/tree/net/netfilter?id=303223092081963513494b4377fa1ac9e362ed4b'>net/netfilter</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/netfilter?id=c74454fadd5ea6fc866ffe2c417a0dba56b2bf1c'>c74454fadd5ea6fc866ffe2c417a0dba56b2bf1c</a> (<a href='/cgit.cgi/linux/net-next.git/diff/net/netfilter?id=303223092081963513494b4377fa1ac9e362ed4b&amp;id2=c74454fadd5ea6fc866ffe2c417a0dba56b2bf1c'>diff</a>)</td></tr></table>
<div class='commit-subject'>netfilter: guarantee 8 byte minalign for template addresses</div><div class='commit-msg'>The next change will merge skb-&gt;nfct pointer and skb-&gt;nfctinfo
status bits into single skb-&gt;_nfct (unsigned long) area.

For this to work nf_conn addresses must always be aligned at least on
an 8 byte boundary since we will need the lower 3bits to store nfctinfo.

Conntrack templates are allocated via kmalloc.
kbuild test robot reported
BUILD_BUG_ON failed: NFCT_INFOMASK &gt;= ARCH_KMALLOC_MINALIGN
on v1 of this patchset, so not all platforms meet this requirement.

Do manual alignment if needed,  the alignment offset is stored in the
nf_conn entry protocol area. This works because templates are not
handed off to L4 protocol trackers.

Reported-by: kbuild test robot &lt;fengguang.wu@intel.com&gt;
Signed-off-by: Florian Westphal &lt;fw@strlen.de&gt;
Signed-off-by: Pablo Neira Ayuso &lt;pablo@netfilter.org&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=303223092081963513494b4377fa1ac9e362ed4b'>Diffstat</a> (limited to 'net/netfilter')</div><table summary='diffstat' class='diffstat'><tr><td class='mode'>-rw-r--r--</td><td class='upd'><a href='/cgit.cgi/linux/net-next.git/diff/net/netfilter/nf_conntrack_core.c?id=303223092081963513494b4377fa1ac9e362ed4b'>net/netfilter/nf_conntrack_core.c</a></td><td class='right'>29</td><td class='graph'><table summary='file diffstat' width='29%'><tr><td class='add' style='width: 82.8%;'/><td class='rem' style='width: 17.2%;'/><td class='none' style='width: 0.0%;'/></tr></table></td></tr>
</table><div class='diffstat-summary'>1 files changed, 24 insertions, 5 deletions</div><table summary='diff' class='diff'><tr><td><div class='head'>diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c