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Commit f6931f5f authored by Florian Westphal's avatar Florian Westphal Committed by Pablo Neira Ayuso
Browse files

netfilter: meta: secpath support 



replacement for iptables "-m policy --dir in --policy {ipsec,none}".

Signed-off-by: default avatarFlorian Westphal <fw@strlen.de>
Signed-off-by: default avatarPablo Neira Ayuso <pablo@netfilter.org>
parent b3a61254

include/uapi/linux/netfilter/nf_tables.h

+2 −0
Original line number Diff line number Diff line
@@ -777,6 +777,7 @@ enum nft_exthdr_attributes { 
 * @NFT_META_OIFGROUP: packet output interface group

 * @NFT_META_CGROUP: socket control group (skb->sk->sk_classid)

 * @NFT_META_PRANDOM: a 32bit pseudo-random number

 * @NFT_META_SECPATH: boolean, secpath_exists (!!skb->sp)

 */

enum nft_meta_keys {

	NFT_META_LEN,
@@ -804,6 +805,7 @@ enum nft_meta_keys { 
	NFT_META_OIFGROUP,

	NFT_META_CGROUP,

	NFT_META_PRANDOM,

	NFT_META_SECPATH,

};



/**

net/netfilter/nft_meta.c

+43 −0
Original line number Diff line number Diff line
@@ -210,6 +210,11 @@ void nft_meta_get_eval(const struct nft_expr *expr, 
		*dest = prandom_u32_state(state);

		break;

	}

#ifdef CONFIG_XFRM

	case NFT_META_SECPATH:

		nft_reg_store8(dest, !!skb->sp);

		break;

#endif

	default:

		WARN_ON(1);

		goto err;
@@ -308,6 +313,11 @@ int nft_meta_get_init(const struct nft_ctx *ctx, 
		prandom_init_once(&nft_prandom_state);

		len = sizeof(u32);

		break;

#ifdef CONFIG_XFRM

	case NFT_META_SECPATH:

		len = sizeof(u8);

		break;

#endif

	default:

		return -EOPNOTSUPP;

	}
@@ -318,6 +328,38 @@ int nft_meta_get_init(const struct nft_ctx *ctx, 
}

EXPORT_SYMBOL_GPL(nft_meta_get_init);



static int nft_meta_get_validate(const struct nft_ctx *ctx,

				 const struct nft_expr *expr,

				 const struct nft_data **data)

{

#ifdef CONFIG_XFRM

	const struct nft_meta *priv = nft_expr_priv(expr);

	unsigned int hooks;



	if (priv->key != NFT_META_SECPATH)

		return 0;



	switch (ctx->afi->family) {

	case NFPROTO_NETDEV:

		hooks = 1 << NF_NETDEV_INGRESS;

		break;

	case NFPROTO_IPV4:

	case NFPROTO_IPV6:

	case NFPROTO_INET:

		hooks = (1 << NF_INET_PRE_ROUTING) |

			(1 << NF_INET_LOCAL_IN) |

			(1 << NF_INET_FORWARD);

		break;

	default:

		return -EOPNOTSUPP;

	}



	return nft_chain_validate_hooks(ctx->chain, hooks);

#else

	return 0;

#endif

}



int nft_meta_set_validate(const struct nft_ctx *ctx,

			  const struct nft_expr *expr,

			  const struct nft_data **data)
@@ -434,6 +476,7 @@ static const struct nft_expr_ops nft_meta_get_ops = { 
	.eval		= nft_meta_get_eval,

	.init		= nft_meta_get_init,

	.dump		= nft_meta_get_dump,

	.validate	= nft_meta_get_validate,

};



static const struct nft_expr_ops nft_meta_set_ops = {