openvswitch: TCP flags matching support.

    tcp_flags=flags/mask
        Bitwise  match on TCP flags.  The flags and mask are 16-bit num‐
        bers written in decimal or in hexadecimal prefixed by 0x.   Each
        1-bit  in  mask requires that the corresponding bit in port must
        match.  Each 0-bit in mask causes the corresponding  bit  to  be
        ignored.

        TCP  protocol  currently  defines  9 flag bits, and additional 3
        bits are reserved (must be transmitted as zero), see  RFCs  793,
        3168, and 3540.  The flag bits are, numbering from the least
        significant bit:

        0: FIN No more data from sender.

        1: SYN Synchronize sequence numbers.

        2: RST Reset the connection.

        3: PSH Push function.

        4: ACK Acknowledgement field significant.

        5: URG Urgent pointer field significant.

        6: ECE ECN Echo.

        7: CWR Congestion Windows Reduced.

        8: NS  Nonce Sum.

        9-11:  Reserved.

        12-15: Not matchable, must be zero.

Signed-off-by: Jarno Rajahalme <jrajahalme@nicira.com>
Signed-off-by: Jesse Gross <jesse@nicira.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/net/openvswitch/flow.h b/net/openvswitch/flow.h
index 204e0ccd116d..1510f51dbf74 100644
--- a/net/openvswitch/flow.h
+++ b/net/openvswitch/flow.h
@@ -93,6 +93,7 @@ struct sw_flow_key {
                                 struct {
                                         __be16 src;             /* TCP/UDP/SCTP source port. */
                                         __be16 dst;             /* TCP/UDP/SCTP destination port. */
+                                        __be16 flags;           /* TCP flags. */
                                 } tp;
                                 struct {
                                         u8 sha[ETH_ALEN];       /* ARP source hardware address. */
@@ -109,6 +110,7 @@ struct sw_flow_key {
                         struct {
                                 __be16 src;             /* TCP/UDP/SCTP source port. */
                                 __be16 dst;             /* TCP/UDP/SCTP destination port. */
+                                __be16 flags;           /* TCP flags. */
                         } tp;
                         struct {
                                 struct in6_addr target; /* ND target address. */