Merge tag 'ipvs2-for-v4.7' of https://git.kernel.org/pub/scm/linux/kernel/git/horms/ipvs-next

Simon Horman says:

====================
Second Round of IPVS Updates for v4.7

please consider these enhancements to the IPVS. They allow its DoS
mitigation strategy effective in conjunction with the SIP persistence
engine.
====================

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

net/netfilter/ipvs/ip_vs_conn.c

@@ -1261,6 +1261,16 @@ static inline int todrop_entry(struct ip_vs_conn *cp)
 	return 1;
 }
 
+static inline bool ip_vs_conn_ops_mode(struct ip_vs_conn *cp)
+{
+	struct ip_vs_service *svc;
+
+	if (!cp->dest)
+		return false;
+	svc = rcu_dereference(cp->dest->svc);
+	return svc && (svc->flags & IP_VS_SVC_F_ONEPACKET);
+}
+
 /* Called from keventd and must protect itself from softirqs */
 void ip_vs_random_dropentry(struct netns_ipvs *ipvs)
 {
@@ -1275,11 +1285,16 @@ void ip_vs_random_dropentry(struct netns_ipvs *ipvs)
 		unsigned int hash = prandom_u32() & ip_vs_conn_tab_mask;
 
 		hlist_for_each_entry_rcu(cp, &ip_vs_conn_tab[hash], c_list) {
-			if (cp->flags & IP_VS_CONN_F_TEMPLATE)
-				/* connection template */
-				continue;
 			if (cp->ipvs != ipvs)
 				continue;
+			if (cp->flags & IP_VS_CONN_F_TEMPLATE) {
+				if (atomic_read(&cp->n_control) ||
+				    !ip_vs_conn_ops_mode(cp))
+					continue;
+				else
+					/* connection template of OPS */
+					goto try_drop;
+			}
 			if (cp->protocol == IPPROTO_TCP) {
 				switch(cp->state) {
 				case IP_VS_TCP_S_SYN_RECV:
@@ -1307,6 +1322,7 @@ void ip_vs_random_dropentry(struct netns_ipvs *ipvs)
 					continue;
 				}
 			} else {
+try_drop:
 				if (!todrop_entry(cp))
 					continue;
 			}

net/netfilter/ipvs/ip_vs_core.c

@@ -612,7 +612,10 @@ int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb,
 		ret = cp->packet_xmit(skb, cp, pd->pp, iph);
 		/* do not touch skb anymore */
 
-		atomic_inc(&cp->in_pkts);
+		if ((cp->flags & IP_VS_CONN_F_ONE_PACKET) && cp->control)
+			atomic_inc(&cp->control->in_pkts);
+		else
+			atomic_inc(&cp->in_pkts);
 		ip_vs_conn_put(cp);
 		return ret;
 	}
@@ -1991,6 +1994,9 @@ ip_vs_in(struct netns_ipvs *ipvs, unsigned int hooknum, struct sk_buff *skb, int
 
 	if (ipvs->sync_state & IP_VS_STATE_MASTER)
 		ip_vs_sync_conn(ipvs, cp, pkts);
+	else if ((cp->flags & IP_VS_CONN_F_ONE_PACKET) && cp->control)
+		/* increment is done inside ip_vs_sync_conn too */
+		atomic_inc(&cp->control->in_pkts);
 
 	ip_vs_conn_put(cp);
 	return ret;