diff mbox series

[net-next,2/8] mptcp: track accurately the incoming MPC suboption type

Message ID 20221125222958.958636-3-matthieu.baerts@tessares.net
State New
Headers
Series mptcp: MSG_FASTOPEN and TFO listener side support |

Commit Message

Matthieu Baerts Nov. 25, 2022, 10:29 p.m. UTC 
  From: Paolo Abeni <pabeni@redhat.com>

Currently in the receive path we don't need to discriminate
between MPC SYN, MPC SYN-ACK and MPC ACK, but soon the fastopen
code will need that info to properly track the fully established
status.

Track the exact MPC suboption type into the receive opt bitmap.
No functional change intended.

Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Reviewed-by: Matthieu Baerts <matthieu.baerts@tessares.net>
Signed-off-by: Matthieu Baerts <matthieu.baerts@tessares.net>
---
 net/mptcp/options.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)
diff mbox series

Patch

diff --git a/net/mptcp/options.c b/net/mptcp/options.c
index 30d289044e71..784a205e80da 100644
--- a/net/mptcp/options.c
+++ b/net/mptcp/options.c
@@ -26,6 +26,7 @@  static void mptcp_parse_option(const struct sk_buff *skb,
 {
 	u8 subtype = *ptr >> 4;
 	int expected_opsize;
+	u16 subopt;
 	u8 version;
 	u8 flags;
 	u8 i;
@@ -38,11 +39,15 @@  static void mptcp_parse_option(const struct sk_buff *skb,
 				expected_opsize = TCPOLEN_MPTCP_MPC_ACK_DATA;
 			else
 				expected_opsize = TCPOLEN_MPTCP_MPC_ACK;
+			subopt = OPTION_MPTCP_MPC_ACK;
 		} else {
-			if (TCP_SKB_CB(skb)->tcp_flags & TCPHDR_ACK)
+			if (TCP_SKB_CB(skb)->tcp_flags & TCPHDR_ACK) {
 				expected_opsize = TCPOLEN_MPTCP_MPC_SYNACK;
-			else
+				subopt = OPTION_MPTCP_MPC_SYNACK;
+			} else {
 				expected_opsize = TCPOLEN_MPTCP_MPC_SYN;
+				subopt = OPTION_MPTCP_MPC_SYN;
+			}
 		}
 
 		/* Cfr RFC 8684 Section 3.3.0:
@@ -85,7 +90,7 @@  static void mptcp_parse_option(const struct sk_buff *skb,
 
 		mp_opt->deny_join_id0 = !!(flags & MPTCP_CAP_DENY_JOIN_ID0);
 
-		mp_opt->suboptions |= OPTIONS_MPTCP_MPC;
+		mp_opt->suboptions |= subopt;
 		if (opsize >= TCPOLEN_MPTCP_MPC_SYNACK) {
 			mp_opt->sndr_key = get_unaligned_be64(ptr);
 			ptr += 8;