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[nf-next,6/7] netfilter: nft_fwd_netdev: add fw_netdev action support

Message ID 1563886364-11164-7-git-send-email-wenxu@ucloud.cn
State Changes Requested
Delegated to: Pablo Neira
Headers show
Series netfilter: nf_tables_offload: support more actions | expand

Commit Message

wenxu July 23, 2019, 12:52 p.m. UTC 
From: wenxu <wenxu@ucloud.cn>

fwd_netdev action offload:
nft --debug=netlink add rule netdev firewall aclout ip daddr 10.0.1.7 fwd to eth0

Signed-off-by: wenxu <wenxu@ucloud.cn>
---
 net/netfilter/nft_fwd_netdev.c | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)
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Patch

diff --git a/net/netfilter/nft_fwd_netdev.c b/net/netfilter/nft_fwd_netdev.c
index 61b7f93..06dbd98 100644
--- a/net/netfilter/nft_fwd_netdev.c
+++ b/net/netfilter/nft_fwd_netdev.c
@@ -15,6 +15,7 @@ 
 #include <net/netfilter/nf_dup_netdev.h>
 #include <net/neighbour.h>
 #include <net/ip.h>
+#include <net/netfilter/nf_tables_offload.h>
 
 struct nft_fwd_netdev {
 	enum nft_registers	sreg_dev:8;
@@ -63,6 +64,33 @@  static int nft_fwd_netdev_dump(struct sk_buff *skb, const struct nft_expr *expr)
 	return -1;
 }
 
+static int nft_fwd_netdev_offload(struct nft_offload_ctx *ctx,
+				  struct nft_flow_rule *flow,
+				  const struct nft_expr *expr)
+{
+	const struct nft_fwd_netdev *priv = nft_expr_priv(expr);
+	struct nft_offload_reg *reg = &ctx->regs[priv->sreg_dev];
+	const struct nft_data *data = &reg->action.data;
+	struct flow_action_entry *entry;
+	struct net_device *dev;
+	int oif = -1;
+
+	if (reg->type != NFT_OFFLOAD_REG_ACTION)
+		return -EOPNOTSUPP;
+
+	entry = &flow->rule->action.entries[ctx->num_actions++];
+
+	memcpy(&oif, data->data, sizeof(oif));
+	dev = __dev_get_by_index(ctx->net, oif);
+	if (!dev)
+		return -EOPNOTSUPP;
+
+	entry->id = FLOW_ACTION_REDIRECT;
+	entry->dev = dev;
+
+	return 0;
+}
+
 struct nft_fwd_neigh {
 	enum nft_registers	sreg_dev:8;
 	enum nft_registers	sreg_addr:8;
@@ -194,6 +222,8 @@  static int nft_fwd_neigh_dump(struct sk_buff *skb, const struct nft_expr *expr)
 	.eval		= nft_fwd_netdev_eval,
 	.init		= nft_fwd_netdev_init,
 	.dump		= nft_fwd_netdev_dump,
+	.offload	= nft_fwd_netdev_offload,
+	.offload_actions = nft_offload_action,
 };
 
 static const struct nft_expr_ops *