nftables: add inbound ipsec matching

index a3ee277b17a1..2efbf9744c2a 100644
@@ -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,
 };
 
 /**

index 5a60eb23a7ed..63a013ad4077 100644
@@ -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 +328,34 @@ int nft_meta_get_init(const struct nft_ctx *ctx,
 }
 EXPORT_SYMBOL_GPL(nft_meta_get_init);
 
+int nft_meta_get_validate(const struct nft_ctx *ctx,
+			  const struct nft_expr *expr,
+			  const struct nft_data **data)
+{
+	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);
+}
+
 int nft_meta_set_validate(const struct nft_ctx *ctx,
 			  const struct nft_expr *expr,
 			  const struct nft_data **data)

@@ -434,6 +472,7 @@ 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 = {

index 874fa3f239eb..64d4a25f8409 100644
@@ -775,6 +775,7 @@ 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,

@@ -802,6 +803,7 @@ enum nft_meta_keys {
 	NFT_META_OIFGROUP,
 	NFT_META_CGROUP,
 	NFT_META_PRANDOM,
+	NFT_META_SECPATH,
 };
 
 /**

index 2c758412bf2e..de82105de44f 100644
@@ -22,7 +22,7 @@
 #include <libnftnl/rule.h>
 
 #ifndef NFT_META_MAX
-#define NFT_META_MAX (NFT_META_PRANDOM + 1)
+#define NFT_META_MAX (NFT_META_SECPATH + 1)
 #endif
 
 struct nftnl_expr_meta {

@@ -158,6 +158,7 @@ static const char *meta_key2str_array[NFT_META_MAX] = {
 	[NFT_META_OIFGROUP]	= "oifgroup",
 	[NFT_META_CGROUP]	= "cgroup",
 	[NFT_META_PRANDOM]	= "prandom",
+	[NFT_META_SECPATH]	= "secpath",
 };
 
 static const char *meta_key2str(uint8_t key)

index f32894431f82..c990bc987c2e 100644
@@ -773,6 +773,7 @@ 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,

@@ -800,6 +801,7 @@ enum nft_meta_keys {
 	NFT_META_OIFGROUP,
 	NFT_META_CGROUP,
 	NFT_META_PRANDOM,
+	NFT_META_SECPATH,
 };
 
 /**

index 28aebe396f17..ac3e0333a489 100644
@@ -428,6 +428,8 @@ static const struct meta_template meta_templates[] = {
 	[NFT_META_PRANDOM]	= META_TEMPLATE("random",    &integer_type,
 						4 * BITS_PER_BYTE,
 						BYTEORDER_BIG_ENDIAN), /* avoid conversion; doesn't have endianess */
+	[NFT_META_SECPATH]	= META_TEMPLATE("secpath", &boolean_type,
+						BITS_PER_BYTE, BYTEORDER_HOST_ENDIAN),
 };
 
 static bool meta_key_is_qualified(enum nft_meta_keys key)

@@ -439,6 +441,7 @@ static bool meta_key_is_qualified(enum nft_meta_keys key)
 	case NFT_META_PROTOCOL:
 	case NFT_META_PRIORITY:
 	case NFT_META_PRANDOM:
+	case NFT_META_SECPATH:
 		return true;
 	default:
 		return false;