/*
 * Copyright (c) 2015 Pablo Neira Ayuso <pablo@netfilter.org>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published by
 * the Free Software Foundation.
 */

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/netlink.h>
#include <linux/netfilter.h>
#include <linux/netfilter/nf_tables.h>
#include <net/netfilter/nf_tables.h>
#include <net/netfilter/ipv4/nf_dup_ipv4.h>

struct nft_dup_ipv4 {
	enum nft_registers	sreg_addr:8;
	enum nft_registers	sreg_dev:8;
};

static void nft_dup_ipv4_eval(const struct nft_expr *expr,
			      struct nft_regs *regs,
			      const struct nft_pktinfo *pkt)
{
	struct nft_dup_ipv4 *priv = nft_expr_priv(expr);
	struct in_addr gw = {
		.s_addr = (__force __be32)regs->data[priv->sreg_addr],
	};
	int oif = priv->sreg_dev ? regs->data[priv->sreg_dev] : -1;

	nf_dup_ipv4(nft_net(pkt), pkt->skb, nft_hook(pkt), &gw, oif);
}

static int nft_dup_ipv4_init(const struct nft_ctx *ctx,
			     const struct nft_expr *expr,
			     const struct nlattr * const tb[])
{
	struct nft_dup_ipv4 *priv = nft_expr_priv(expr);
	int err;

	if (tb[NFTA_DUP_SREG_ADDR] == NULL)
		return -EINVAL;

	priv->sreg_addr = nft_parse_register(tb[NFTA_DUP_SREG_ADDR]);
	err = nft_validate_register_load(priv->sreg_addr, sizeof(struct in_addr));
	if (err < 0)
		return err;

	if (tb[NFTA_DUP_SREG_DEV] != NULL) {
		priv->sreg_dev = nft_parse_register(tb[NFTA_DUP_SREG_DEV]);
		return nft_validate_register_load(priv->sreg_dev, sizeof(int));
	}
	return 0;
}

static int nft_dup_ipv4_dump(struct sk_buff *skb, const struct nft_expr *expr)
{
	struct nft_dup_ipv4 *priv = nft_expr_priv(expr);

	if (nft_dump_register(skb, NFTA_DUP_SREG_ADDR, priv->sreg_addr))
		goto nla_put_failure;
	if (priv->sreg_dev &&
	    nft_dump_register(skb, NFTA_DUP_SREG_DEV, priv->sreg_dev))
		goto nla_put_failure;

	return 0;

nla_put_failure:
	return -1;
}

static struct nft_expr_type nft_dup_ipv4_type;
static const struct nft_expr_ops nft_dup_ipv4_ops = {
	.type		= &nft_dup_ipv4_type,
	.size		= NFT_EXPR_SIZE(sizeof(struct nft_dup_ipv4)),
	.eval		= nft_dup_ipv4_eval,
	.init		= nft_dup_ipv4_init,
	.dump		= nft_dup_ipv4_dump,
};

static const struct nla_policy nft_dup_ipv4_policy[NFTA_DUP_MAX + 1] = {
	[NFTA_DUP_SREG_ADDR]	= { .type = NLA_U32 },
	[NFTA_DUP_SREG_DEV]	= { .type = NLA_U32 },
};

static struct nft_expr_type nft_dup_ipv4_type __read_mostly = {
	.family		= NFPROTO_IPV4,
	.name		= "dup",
	.ops		= &nft_dup_ipv4_ops,
	.policy		= nft_dup_ipv4_policy,
	.maxattr	= NFTA_DUP_MAX,
	.owner		= THIS_MODULE,
};

static int __init nft_dup_ipv4_module_init(void)
{
	return nft_register_expr(&nft_dup_ipv4_type);
}

static void __exit nft_dup_ipv4_module_exit(void)
{
	nft_unregister_expr(&nft_dup_ipv4_type);
}

module_init(nft_dup_ipv4_module_init);
module_exit(nft_dup_ipv4_module_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");
MODULE_ALIAS_NFT_AF_EXPR(AF_INET, "dup");
3c7bd6be3087b0ba'>trace.h</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='e7aa8c2eb11ba69b1b69099c3c7bd6be3087b0ba'/><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>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2016-12-12 21:58:13 -0800</td></tr>
<tr><th>committer</th><td>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2016-12-12 21:58:13 -0800</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/kernel/trace/trace.h?id=e7aa8c2eb11ba69b1b69099c3c7bd6be3087b0ba'>e7aa8c2eb11ba69b1b69099c3c7bd6be3087b0ba</a> (<a href='/cgit.cgi/linux/net-next.git/patch/kernel/trace/trace.h?id=e7aa8c2eb11ba69b1b69099c3c7bd6be3087b0ba'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=e7aa8c2eb11ba69b1b69099c3c7bd6be3087b0ba'>f63906f41699c8e38af9d12b063e2ceab0286ef2</a> /<a href='/cgit.cgi/linux/net-next.git/tree/kernel/trace/trace.h?id=e7aa8c2eb11ba69b1b69099c3c7bd6be3087b0ba'>kernel/trace/trace.h</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/kernel/trace/trace.h?id=e34bac726d27056081d0250c0e173e4b155aa340'>e34bac726d27056081d0250c0e173e4b155aa340</a> (<a href='/cgit.cgi/linux/net-next.git/diff/kernel/trace/trace.h?id=e7aa8c2eb11ba69b1b69099c3c7bd6be3087b0ba&amp;id2=e34bac726d27056081d0250c0e173e4b155aa340'>diff</a>)</td></tr><tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/kernel/trace/trace.h?id=868c97a846a73e937d835b09b8c885a69df50ec8'>868c97a846a73e937d835b09b8c885a69df50ec8</a> (<a href='/cgit.cgi/linux/net-next.git/diff/kernel/trace/trace.h?id=e7aa8c2eb11ba69b1b69099c3c7bd6be3087b0ba&amp;id2=868c97a846a73e937d835b09b8c885a69df50ec8'>diff</a>)</td></tr></table>
<div class='commit-subject'>Merge tag 'docs-4.10' of git://git.lwn.net/linux<span class='decoration'><a class='deco' href='/cgit.cgi/linux/net-next.git/commit/kernel/trace/trace.h?id=e7aa8c2eb11ba69b1b69099c3c7bd6be3087b0ba'>HEAD</a><a class='branch-deco' href='/cgit.cgi/linux/net-next.git/log/kernel/trace/trace.h'>master</a></span></div><div class='commit-msg'>Pull documentation update from Jonathan Corbet:
 "These are the documentation changes for 4.10.

  It's another busy cycle for the docs tree, as the sphinx conversion
  continues. Highlights include:

   - Further work on PDF output, which remains a bit of a pain but
     should be more solid now.

   - Five more DocBook template files converted to Sphinx. Only 27 to
     go... Lots of plain-text files have also been converted and
     integrated.

   - Images in binary formats have been replaced with more
     source-friendly versions.

   - Various bits of organizational work, including the renaming of
     various files discussed at the kernel summit.

   - New documentation for the device_link mechanism.

  ... and, of course, lots of typo fixes and small updates"

* tag 'docs-4.10' of git://git.lwn.net/linux: (193 commits)
  dma-buf: Extract dma-buf.rst
  Update Documentation/00-INDEX
  docs: 00-INDEX: document directories/files with no docs
  docs: 00-INDEX: remove non-existing entries
  docs: 00-INDEX: add missing entries for documentation files/dirs
  docs: 00-INDEX: consolidate process/ and admin-guide/ description
  scripts: add a script to check if Documentation/00-INDEX is sane
  Docs: change sh -&gt; awk in REPORTING-BUGS
  Documentation/core-api/device_link: Add initial documentation
  core-api: remove an unexpected unident
  ppc/idle: Add documentation for powersave=off
  Doc: Correct typo, "Introdution" =&gt; "Introduction"
  Documentation/atomic_ops.txt: convert to ReST markup
  Documentation/local_ops.txt: convert to ReST markup
  Documentation/assoc_array.txt: convert to ReST markup
  docs-rst: parse-headers.pl: cleanup the documentation
  docs-rst: fix media cleandocs target
  docs-rst: media/Makefile: reorganize the rules
  docs-rst: media: build SVG from graphviz files
  docs-rst: replace bayer.png by a SVG image
  ...
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=e7aa8c2eb11ba69b1b69099c3c7bd6be3087b0ba'>Diffstat</a> (limited to 'kernel/trace/trace.h')</div><table summary='diffstat' class='diffstat'>