[NETFILTER]: Ignore ACKs ACKs on half open connections in TCP conntrack

Mounting NFS file systems after a (warm) reboot could take a long time if
firewalling and connection tracking was enabled.

The reason is that the NFS clients tends to use the same ports (800 and
counting down). Now on reboot, the server would still have a TCB for an
existing TCP connection client:800 -> server:2049. The client sends a
SYN from port 800 to server:2049, which elicits an ACK from the server.
The firewall on the client drops the ACK because (from its point of
view) the connection is still in half-open state, and it expects to see
a SYNACK.

The client will eventually time out after several minutes.

The following patch corrects this, by accepting ACKs on half open
connections as well.

Signed-off-by: Jozsef Kadlecsik <[e-mail]>
Signed-off-by: Patrick McHardy <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

net/ipv4/netfilter/ip_conntrack_proto_tcp.c

···
  *	sCL -> sCL
  */
 /* 	     sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sLI	*/
-/*ack*/	   { sIV, sIV, sSR, sES, sCW, sCW, sTW, sTW, sCL, sIV },
+/*ack*/	   { sIV, sIG, sSR, sES, sCW, sCW, sTW, sTW, sCL, sIV },
 /*
- *	sSS -> sIV	Might be a half-open connection.
+ *	sSS -> sIG	Might be a half-open connection.
  *	sSR -> sSR	Might answer late resent SYN.
  *	sES -> sES	:-)
  *	sFW -> sCW	Normal close request answered by ACK.
···
 
 	switch (new_state) {
 	case TCP_CONNTRACK_IGNORE:
-		/* Either SYN in ORIGINAL
-		 * or SYN/ACK in REPLY. */
+		/* Ignored packets:
+		 * 
+		 * a) SYN in ORIGINAL
+		 * b) SYN/ACK in REPLY
+		 * c) ACK in reply direction after initial SYN in original.
+		 */
 		if (index == TCP_SYNACK_SET
 		    && conntrack->proto.tcp.last_index == TCP_SYN_SET
 		    && conntrack->proto.tcp.last_dir != dir
···
 		}
 	case TCP_CONNTRACK_CLOSE:
 		if (index == TCP_RST_SET
-		    && test_bit(IPS_SEEN_REPLY_BIT, &conntrack->status)
-		    && conntrack->proto.tcp.last_index == TCP_SYN_SET
+		    && ((test_bit(IPS_SEEN_REPLY_BIT, &conntrack->status)
+		         && conntrack->proto.tcp.last_index == TCP_SYN_SET)
+		        || (!test_bit(IPS_ASSURED_BIT, &conntrack->status)
+		            && conntrack->proto.tcp.last_index == TCP_ACK_SET))
 		    && ntohl(th->ack_seq) == conntrack->proto.tcp.last_end) {
-			/* RST sent to invalid SYN we had let trough
-			 * SYN was in window then, tear down connection.
+			/* RST sent to invalid SYN or ACK we had let trough
+			 * at a) and c) above:
+			 *
+			 * a) SYN was in window then
+			 * c) we hold a half-open connection.
+			 *
+			 * Delete our connection entry.
 			 * We skip window checking, because packet might ACK
-			 * segments we ignored in the SYN. */
+			 * segments we ignored. */
 			goto in_window;
 		}
 		/* Just fall trough */

net/netfilter/nf_conntrack_proto_tcp.c

···
  *	sCL -> sCL
  */
 /* 	     sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sLI	*/
-/*ack*/	   { sIV, sIV, sSR, sES, sCW, sCW, sTW, sTW, sCL, sIV },
+/*ack*/	   { sIV, sIG, sSR, sES, sCW, sCW, sTW, sTW, sCL, sIV },
 /*
- *	sSS -> sIV	Might be a half-open connection.
+ *	sSS -> sIG	Might be a half-open connection.
  *	sSR -> sSR	Might answer late resent SYN.
  *	sES -> sES	:-)
  *	sFW -> sCW	Normal close request answered by ACK.
···
 
 	switch (new_state) {
 	case TCP_CONNTRACK_IGNORE:
-		/* Either SYN in ORIGINAL
-		 * or SYN/ACK in REPLY. */
+		/* Ignored packets:
+		 *
+		 * a) SYN in ORIGINAL
+		 * b) SYN/ACK in REPLY
+		 * c) ACK in reply direction after initial SYN in original. 
+		 */
 		if (index == TCP_SYNACK_SET
 		    && conntrack->proto.tcp.last_index == TCP_SYN_SET
 		    && conntrack->proto.tcp.last_dir != dir
···
 		}
 	case TCP_CONNTRACK_CLOSE:
 		if (index == TCP_RST_SET
-		    && test_bit(IPS_SEEN_REPLY_BIT, &conntrack->status)
-		    && conntrack->proto.tcp.last_index == TCP_SYN_SET
+		    && ((test_bit(IPS_SEEN_REPLY_BIT, &conntrack->status)
+		         && conntrack->proto.tcp.last_index == TCP_SYN_SET)
+		        || (!test_bit(IPS_ASSURED_BIT, &conntrack->status)
+		            && conntrack->proto.tcp.last_index == TCP_ACK_SET))
 		    && ntohl(th->ack_seq) == conntrack->proto.tcp.last_end) {
-			/* RST sent to invalid SYN we had let trough
-			 * SYN was in window then, tear down connection.
+			/* RST sent to invalid SYN or ACK we had let trough
+			 * at a) and c) above:
+			 *
+			 * a) SYN was in window then
+			 * c) we hold a half-open connection.
+			 *
+			 * Delete our connection entry.
 			 * We skip window checking, because packet might ACK
-			 * segments we ignored in the SYN. */
+			 * segments we ignored. */
 			goto in_window;
 		}
 		/* Just fall trough */