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From: Pablo Neira Ayuso <pablo@netfilter.org>
To: netfilter-devel@vger.kernel.org
Subject: [PATCH nf-next 2/5] netfilter: nf_tables: add NFTA_VERDICT_CHAIN_ID attribute
Date: Mon, 29 Jun 2020 23:03:34 +0200
Message-ID: <20200629210337.30008-3-pablo@netfilter.org> (raw)
In-Reply-To: <20200629210337.30008-1-pablo@netfilter.org>

This netlink attribute allows you to identify the chain to jump/goto by
means of the chain ID.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
 include/uapi/linux/netfilter/nf_tables.h |  2 ++
 net/netfilter/nf_tables_api.c            | 16 +++++++++++++---
 2 files changed, 15 insertions(+), 3 deletions(-)

diff --git a/include/uapi/linux/netfilter/nf_tables.h b/include/uapi/linux/netfilter/nf_tables.h
index 2304d1b7ba5e..683e75126d68 100644
--- a/include/uapi/linux/netfilter/nf_tables.h
+++ b/include/uapi/linux/netfilter/nf_tables.h
@@ -471,11 +471,13 @@ enum nft_data_attributes {
  *
  * @NFTA_VERDICT_CODE: nf_tables verdict (NLA_U32: enum nft_verdicts)
  * @NFTA_VERDICT_CHAIN: jump target chain name (NLA_STRING)
+ * @NFTA_VERDICT_CHAIN_ID: jump target chain ID (NLA_U32)
  */
 enum nft_verdict_attributes {
 	NFTA_VERDICT_UNSPEC,
 	NFTA_VERDICT_CODE,
 	NFTA_VERDICT_CHAIN,
+	NFTA_VERDICT_CHAIN_ID,
 	__NFTA_VERDICT_MAX
 };
 #define NFTA_VERDICT_MAX	(__NFTA_VERDICT_MAX - 1)
diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index fbe8f9209813..9be978788aef 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -8242,6 +8242,7 @@ static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
 	[NFTA_VERDICT_CODE]	= { .type = NLA_U32 },
 	[NFTA_VERDICT_CHAIN]	= { .type = NLA_STRING,
 				    .len = NFT_CHAIN_MAXNAMELEN - 1 },
+	[NFTA_VERDICT_CHAIN_ID]	= { .type = NLA_U32 },
 };
 
 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
@@ -8278,10 +8279,19 @@ static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
 		break;
 	case NFT_JUMP:
 	case NFT_GOTO:
-		if (!tb[NFTA_VERDICT_CHAIN])
+		if (tb[NFTA_VERDICT_CHAIN]) {
+			chain = nft_chain_lookup(ctx->net, ctx->table,
+						 tb[NFTA_VERDICT_CHAIN],
+						 genmask);
+		} else if (tb[NFTA_VERDICT_CHAIN_ID]) {
+			chain = nft_chain_lookup_byid(ctx->net,
+						      tb[NFTA_VERDICT_CHAIN_ID]);
+			if (chain->use != 0)
+				return -EBUSY;
+		} else {
 			return -EINVAL;
-		chain = nft_chain_lookup(ctx->net, ctx->table,
-					 tb[NFTA_VERDICT_CHAIN], genmask);
+		}
+
 		if (IS_ERR(chain))
 			return PTR_ERR(chain);
 		if (nft_is_base_chain(chain))
-- 
2.20.1


  parent reply index

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-29 21:03 [PATCH nf-next 0/5,v2] nftables: support for implicit chains binding Pablo Neira Ayuso
2020-06-29 21:03 ` [PATCH nf-next 1/5] netfilter: nf_tables: add NFTA_RULE_CHAIN_ID attribute Pablo Neira Ayuso
2020-06-30 10:24   ` kernel test robot
2020-06-29 21:03 ` Pablo Neira Ayuso [this message]
2020-06-29 21:03 ` [PATCH nf-next 3/5] netfilter: nf_tables: expose enum nft_chain_flags through UAPI Pablo Neira Ayuso
2020-06-29 21:03 ` [PATCH nf-next 4/5] netfilter: nf_tables: add nft_chain_add() Pablo Neira Ayuso
2020-06-29 21:03 ` [PATCH nf-next 5/5] netfilter: nf_tables: add NFT_CHAIN_BINDING Pablo Neira Ayuso

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