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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20221125222958.958636-3-matthieu.baerts@tessares.net>
Date:   Fri, 25 Nov 2022 23:29:48 +0100
From:   Matthieu Baerts <matthieu.baerts@...sares.net>
To:     Mat Martineau <mathew.j.martineau@...ux.intel.com>,
        Matthieu Baerts <matthieu.baerts@...sares.net>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Cc:     netdev@...r.kernel.org, mptcp@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: [PATCH net-next 2/8] mptcp: track accurately the incoming MPC suboption type

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

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;
-- 
2.37.2