/* module that allows mangling of the arp payload */
#include <linux/module.h>
#include <linux/netfilter.h>
#include <linux/netfilter_arp/arpt_mangle.h>
#include <net/sock.h>

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Bart De Schuymer <bdschuym@pandora.be>");
MODULE_DESCRIPTION("arptables arp payload mangle target");

static unsigned int
target(struct sk_buff *skb, const struct xt_action_param *par)
{
	const struct arpt_mangle *mangle = par->targinfo;
	const struct arphdr *arp;
	unsigned char *arpptr;
	int pln, hln;

	if (!skb_make_writable(skb, skb->len))
		return NF_DROP;

	arp = arp_hdr(skb);
	arpptr = skb_network_header(skb) + sizeof(*arp);
	pln = arp->ar_pln;
	hln = arp->ar_hln;
	/* We assume that pln and hln were checked in the match */
	if (mangle->flags & ARPT_MANGLE_SDEV) {
		if (ARPT_DEV_ADDR_LEN_MAX < hln ||
		   (arpptr + hln > skb_tail_pointer(skb)))
			return NF_DROP;
		memcpy(arpptr, mangle->src_devaddr, hln);
	}
	arpptr += hln;
	if (mangle->flags & ARPT_MANGLE_SIP) {
		if (ARPT_MANGLE_ADDR_LEN_MAX < pln ||
		   (arpptr + pln > skb_tail_pointer(skb)))
			return NF_DROP;
		memcpy(arpptr, &mangle->u_s.src_ip, pln);
	}
	arpptr += pln;
	if (mangle->flags & ARPT_MANGLE_TDEV) {
		if (ARPT_DEV_ADDR_LEN_MAX < hln ||
		   (arpptr + hln > skb_tail_pointer(skb)))
			return NF_DROP;
		memcpy(arpptr, mangle->tgt_devaddr, hln);
	}
	arpptr += hln;
	if (mangle->flags & ARPT_MANGLE_TIP) {
		if (ARPT_MANGLE_ADDR_LEN_MAX < pln ||
		   (arpptr + pln > skb_tail_pointer(skb)))
			return NF_DROP;
		memcpy(arpptr, &mangle->u_t.tgt_ip, pln);
	}
	return mangle->target;
}

static int checkentry(const struct xt_tgchk_param *par)
{
	const struct arpt_mangle *mangle = par->targinfo;

	if (mangle->flags & ~ARPT_MANGLE_MASK ||
	    !(mangle->flags & ARPT_MANGLE_MASK))
		return -EINVAL;

	if (mangle->target != NF_DROP && mangle->target != NF_ACCEPT &&
	   mangle->target != XT_CONTINUE)
		return -EINVAL;
	return 0;
}

static struct xt_target arpt_mangle_reg __read_mostly = {
	.name		= "mangle",
	.family		= NFPROTO_ARP,
	.target		= target,
	.targetsize	= sizeof(struct arpt_mangle),
	.checkentry	= checkentry,
	.me		= THIS_MODULE,
};

static int __init arpt_mangle_init(void)
{
	return xt_register_target(&arpt_mangle_reg);
}

static void __exit arpt_mangle_fini(void)
{
	xt_unregister_target(&arpt_mangle_reg);
}

module_init(arpt_mangle_init);
module_exit(arpt_mangle_fini);
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<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/commit/?id=868c97a846a73e937d835b09b8c885a69df50ec8'>root</a>/<a href='/cgit.cgi/linux/net-next.git/commit/Documentation?id=868c97a846a73e937d835b09b8c885a69df50ec8'>Documentation</a>/<a href='/cgit.cgi/linux/net-next.git/commit/Documentation/networking?id=868c97a846a73e937d835b09b8c885a69df50ec8'>networking</a>/<a href='/cgit.cgi/linux/net-next.git/commit/Documentation/networking/ipvlan.txt?id=868c97a846a73e937d835b09b8c885a69df50ec8'>ipvlan.txt</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='868c97a846a73e937d835b09b8c885a69df50ec8'/><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>Daniel Vetter &lt;daniel.vetter@ffwll.ch&gt;</td><td class='right'>2016-12-09 19:53:05 +0100</td></tr>
<tr><th>committer</th><td>Jonathan Corbet &lt;corbet@lwn.net&gt;</td><td class='right'>2016-12-11 13:37:55 -0700</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/Documentation/networking/ipvlan.txt?id=868c97a846a73e937d835b09b8c885a69df50ec8'>868c97a846a73e937d835b09b8c885a69df50ec8</a> (<a href='/cgit.cgi/linux/net-next.git/patch/Documentation/networking/ipvlan.txt?id=868c97a846a73e937d835b09b8c885a69df50ec8'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=868c97a846a73e937d835b09b8c885a69df50ec8'>9cdc05e799d117ac71b29d0958ee3dc65b8d539d</a> /<a href='/cgit.cgi/linux/net-next.git/tree/Documentation/networking/ipvlan.txt?id=868c97a846a73e937d835b09b8c885a69df50ec8'>Documentation/networking/ipvlan.txt</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/Documentation/networking/ipvlan.txt?id=9e22ff439fa2e1201b168c001683f275afd46258'>9e22ff439fa2e1201b168c001683f275afd46258</a> (<a href='/cgit.cgi/linux/net-next.git/diff/Documentation/networking/ipvlan.txt?id=868c97a846a73e937d835b09b8c885a69df50ec8&amp;id2=9e22ff439fa2e1201b168c001683f275afd46258'>diff</a>)</td></tr></table>
<div class='commit-subject'>dma-buf: Extract dma-buf.rst</div><div class='commit-msg'>Just prep work to polish and consolidate all the dma-buf related
documenation.

Unfortunately I didn't discover a way to both integrate this new file
into the overall toc while keeping it at the current place. Work
around that by moving it into the overall driver-api/index.rst.

Cc: linux-doc@vger.kernel.org
Cc: Jonathan Corbet &lt;corbet@lwn.net&gt;
Cc: Sumit Semwal &lt;sumit.semwal@linaro.org&gt;
Signed-off-by: Daniel Vetter &lt;daniel.vetter@intel.com&gt;
Signed-off-by: Jonathan Corbet &lt;corbet@lwn.net&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=868c97a846a73e937d835b09b8c885a69df50ec8'>Diffstat</a> (limited to 'Documentation/networking/ipvlan.txt')</div><table summary='diffstat' class='diffstat'>