netfilter: ctnetlink: support individual atomic-get-and-reset of counters

This allows to use the get operation to atomically get-and-reset
counters.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

1 files changed, 11 insertions, 0 deletions

diff --git a/net/netfilter/nf_conntrack_netlink.c b/net/netfilter/nf_conntrack_netlink.c
index 77d209c235a0..636617ccfe25 100644
--- a/net/netfilter/nf_conntrack_netlink.c
+++ b/net/netfilter/nf_conntrack_netlink.c
@@ -1015,6 +1015,17 @@ ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
         if (err < 0)
                 goto out;
 
+        if (NFNL_MSG_TYPE(nlh->nlmsg_type) == IPCTNL_MSG_CT_GET_CTRZERO) {
+                struct nf_conn_counter *acct;
+
+                acct = nf_conn_acct_find(ct);
+                if (acct) {
+                        atomic64_set(&acct[IP_CT_DIR_ORIGINAL].bytes, 0);
+                        atomic64_set(&acct[IP_CT_DIR_ORIGINAL].packets, 0);
+                        atomic64_set(&acct[IP_CT_DIR_REPLY].bytes, 0);
+                        atomic64_set(&acct[IP_CT_DIR_REPLY].packets, 0);
+                }
+        }
         return 0;
 
 free: