From: Paolo Abeni Date: Fri, 25 Nov 2022 22:29:48 +0000 (+0100) Subject: mptcp: track accurately the incoming MPC suboption type X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=fe33d38626779ffcc1c88204b1931774dc204cb5;p=linux.git mptcp: track accurately the incoming MPC suboption type 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 Reviewed-by: Matthieu Baerts Signed-off-by: Matthieu Baerts Signed-off-by: Jakub Kicinski --- diff --git a/net/mptcp/options.c b/net/mptcp/options.c index 30d289044e71b..784a205e80dab 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;