[PATCH v2] netfilter: nft_ct: Add ct id support

[Brett Mastbergen]

The 'id' key returns the unique id of the conntrack entry as returned
by nf_ct_get_id()

v2: Add nfct_is_confirmed check

Signed-off-by: Brett Mastbergen <bmastber...@untangle.com>
---
 include/uapi/linux/netfilter/nf_tables.h | 2 ++
 net/netfilter/nft_ct.c                   | 8 ++++++++
 2 files changed, 10 insertions(+)

diff --git a/include/uapi/linux/netfilter/nf_tables.h 
b/include/uapi/linux/netfilter/nf_tables.h
index 061bb3eb20c3..f0cf7b0f4f35 100644
--- a/include/uapi/linux/netfilter/nf_tables.h
+++ b/include/uapi/linux/netfilter/nf_tables.h
@@ -967,6 +967,7 @@ enum nft_socket_keys {
  * @NFT_CT_SRC_IP6: conntrack layer 3 protocol source (IPv6 address)
  * @NFT_CT_DST_IP6: conntrack layer 3 protocol destination (IPv6 address)
  * @NFT_CT_TIMEOUT: connection tracking timeout policy assigned to conntrack
+ * @NFT_CT_ID: conntrack id
  */
 enum nft_ct_keys {
        NFT_CT_STATE,
@@ -993,6 +994,7 @@ enum nft_ct_keys {
        NFT_CT_SRC_IP6,
        NFT_CT_DST_IP6,
        NFT_CT_TIMEOUT,
+       NFT_CT_ID,
        __NFT_CT_MAX
 };
 #define NFT_CT_MAX             (__NFT_CT_MAX - 1)
diff --git a/net/netfilter/nft_ct.c b/net/netfilter/nft_ct.c
index 7b717fad6cdc..7706db36f8b9 100644
--- a/net/netfilter/nft_ct.c
+++ b/net/netfilter/nft_ct.c
@@ -178,6 +178,11 @@ static void nft_ct_get_eval(const struct nft_expr *expr,
                return;
        }
 #endif
+       case NFT_CT_ID:
+               if (!nf_ct_is_confirmed(ct))
+                       goto err;
+               *dest = nf_ct_get_id(ct);
+               return;
        default:
                break;
        }
@@ -479,6 +484,9 @@ static int nft_ct_get_init(const struct nft_ctx *ctx,
                len = sizeof(u16);
                break;
 #endif
+       case NFT_CT_ID:
+               len = sizeof(u32);
+               break;
        default:
                return -EOPNOTSUPP;
        }
-- 
2.11.0