/*
 *  ebt_snat
 *
 *	Authors:
 *	Bart De Schuymer <bdschuym@pandora.be>
 *
 *  June, 2002
 *
 */
#include <linux/module.h>
#include <net/sock.h>
#include <linux/if_arp.h>
#include <net/arp.h>
#include <linux/netfilter.h>
#include <linux/netfilter/x_tables.h>
#include <linux/netfilter_bridge/ebtables.h>
#include <linux/netfilter_bridge/ebt_nat.h>

static unsigned int
ebt_snat_tg(struct sk_buff *skb, const struct xt_action_param *par)
{
	const struct ebt_nat_info *info = par->targinfo;

	if (!skb_make_writable(skb, 0))
		return EBT_DROP;

	ether_addr_copy(eth_hdr(skb)->h_source, info->mac);
	if (!(info->target & NAT_ARP_BIT) &&
	    eth_hdr(skb)->h_proto == htons(ETH_P_ARP)) {
		const struct arphdr *ap;
		struct arphdr _ah;

		ap = skb_header_pointer(skb, 0, sizeof(_ah), &_ah);
		if (ap == NULL)
			return EBT_DROP;
		if (ap->ar_hln != ETH_ALEN)
			goto out;
		if (skb_store_bits(skb, sizeof(_ah), info->mac, ETH_ALEN))
			return EBT_DROP;
	}
out:
	return info->target | ~EBT_VERDICT_BITS;
}

static int ebt_snat_tg_check(const struct xt_tgchk_param *par)
{
	const struct ebt_nat_info *info = par->targinfo;
	int tmp;

	tmp = info->target | ~EBT_VERDICT_BITS;
	if (BASE_CHAIN && tmp == EBT_RETURN)
		return -EINVAL;

	if (tmp < -NUM_STANDARD_TARGETS || tmp >= 0)
		return -EINVAL;
	tmp = info->target | EBT_VERDICT_BITS;
	if ((tmp & ~NAT_ARP_BIT) != ~NAT_ARP_BIT)
		return -EINVAL;
	return 0;
}

static struct xt_target ebt_snat_tg_reg __read_mostly = {
	.name		= "snat",
	.revision	= 0,
	.family		= NFPROTO_BRIDGE,
	.table		= "nat",
	.hooks		= (1 << NF_BR_NUMHOOKS) | (1 << NF_BR_POST_ROUTING),
	.target		= ebt_snat_tg,
	.checkentry	= ebt_snat_tg_check,
	.targetsize	= sizeof(struct ebt_nat_info),
	.me		= THIS_MODULE,
};

static int __init ebt_snat_init(void)
{
	return xt_register_target(&ebt_snat_tg_reg);
}

static void __exit ebt_snat_fini(void)
{
	xt_unregister_target(&ebt_snat_tg_reg);
}

module_init(ebt_snat_init);
module_exit(ebt_snat_fini);
MODULE_DESCRIPTION("Ebtables: Source MAC address translation");
MODULE_LICENSE("GPL");
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<div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='6e68b08728ce3365c713f8663c6b05a79e2bbca1'/><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>Vinson Lee &lt;vlee@freedesktop.org&gt;</td><td class='right'>2016-09-17 00:51:53 +0000</td></tr>
<tr><th>committer</th><td>Thomas Gleixner &lt;tglx@linutronix.de&gt;</td><td class='right'>2016-09-20 00:01:48 +0200</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/?id=6e68b08728ce3365c713f8663c6b05a79e2bbca1'>6e68b08728ce3365c713f8663c6b05a79e2bbca1</a> (<a href='/cgit.cgi/linux/net-next.git/patch/?id=6e68b08728ce3365c713f8663c6b05a79e2bbca1'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=6e68b08728ce3365c713f8663c6b05a79e2bbca1'>a7476208f7f4252f3cfc7d0d53ff9cc88dfaf00d</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/?id=3947f49302e4d1576ee58addd8d20b477faef5ea'>3947f49302e4d1576ee58addd8d20b477faef5ea</a> (<a href='/cgit.cgi/linux/net-next.git/diff/?id=6e68b08728ce3365c713f8663c6b05a79e2bbca1&amp;id2=3947f49302e4d1576ee58addd8d20b477faef5ea'>diff</a>)</td></tr></table>
<div class='commit-subject'>x86/vdso: Use CONFIG_X86_X32_ABI to enable vdso prctl</div><div class='commit-msg'>The prctl code which references vdso_image_x32 is built when CONFIG_X86_X32
is set. This results in the following build failure:

  LD      init/built-in.o
arch/x86/built-in.o: In function `do_arch_prctl':
(.text+0x27466): undefined reference to `vdso_image_x32'

vdso_image_x32 depends on CONFIG_X86_X32_ABI. So we need to make the prctl
depend on that as well.

[ tglx: Massaged changelog ]

Fixes: 2eefd8789698 ("x86/arch_prctl/vdso: Add ARCH_MAP_VDSO_*")
Signed-off-by: Vinson Lee &lt;vlee@freedesktop.org&gt;
Reviewed-by: Dmitry Safonov &lt;dsafonov@virtuozzo.com&gt;
Cc: Andy Lutomirski &lt;luto@kernel.org&gt;
Cc: Brian Gerst &lt;brgerst@gmail.com&gt;
Cc: Borislav Petkov &lt;bp@suse.de&gt;
Cc: Dmitry Vyukov &lt;dvyukov@google.com&gt;
Link: http://lkml.kernel.org/r/1474073513-6656-1-git-send-email-vlee@freedesktop.org
Signed-off-by: Thomas Gleixner &lt;tglx@linutronix.de&gt;

</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=6e68b08728ce3365c713f8663c6b05a79e2bbca1'>Diffstat</a></div><table summary='diffstat' class='diffstat'>