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authorPaolo Abeni <pabeni@redhat.com>2022-11-25 23:29:48 +0100
committerJakub Kicinski <kuba@kernel.org>2022-11-29 20:24:24 -0800
commitfe33d38626779ffcc1c88204b1931774dc204cb5 (patch)
treeee8da73ad45bfb0b3919d9f88aa7a56c86c9fa98 /net/mptcp
parent1e777f39b4d75e599a3aac8e0f67d739474f198c (diff)
downloadlinux-fe33d38626779ffcc1c88204b1931774dc204cb5.tar.bz2
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 <pabeni@redhat.com> Reviewed-by: Matthieu Baerts <matthieu.baerts@tessares.net> Signed-off-by: Matthieu Baerts <matthieu.baerts@tessares.net> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'net/mptcp')
-rw-r--r--net/mptcp/options.c11
1 files 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;