commit d67c5649c1541dc93f202eeffc6f49220a4ed71d upstream.
Before this patch, receiving an ADD_ADDR echo on the just connected MP_JOIN subflow -- initiator side, after the MP_JOIN 3WHS -- was resulting in an MP_RESET. That's because only ACKs with a DSS or ADD_ADDRs without the echo bit were allowed.
Not allowing the ADD_ADDR echo after an MP_CAPABLE 3WHS makes sense, as we are not supposed to send an ADD_ADDR before because it requires to be in full established mode first. For the MP_JOIN 3WHS, that's different: the ADD_ADDR can be sent on a previous subflow, and the ADD_ADDR echo can be received on the recently created one. The other peer will already be in fully established, so it is allowed to send that.
We can then relax the conditions here to accept the ADD_ADDR echo for MPJ subflows.
Fixes: 67b12f792d5e ("mptcp: full fully established support after ADD_ADDR") Cc: stable@vger.kernel.org Reviewed-by: Mat Martineau martineau@kernel.org Signed-off-by: Matthieu Baerts (NGI0) matttbe@kernel.org Link: https://patch.msgid.link/20240731-upstream-net-20240731-mptcp-endp-subflow-s... Signed-off-by: Jakub Kicinski kuba@kernel.org [ Conflicts in options.c, because the context has changed in commit b3ea6b272d79 ("mptcp: consolidate initial ack seq generation"), which is not in this version. This commit is unrelated to this modification. ] Signed-off-by: Matthieu Baerts (NGI0) matttbe@kernel.org --- net/mptcp/options.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/net/mptcp/options.c b/net/mptcp/options.c index 4d8f2f6a8f73..2baed0c01922 100644 --- a/net/mptcp/options.c +++ b/net/mptcp/options.c @@ -923,7 +923,8 @@ static bool check_fully_established(struct mptcp_sock *msk, struct sock *ssk, }
if (((mp_opt->suboptions & OPTION_MPTCP_DSS) && mp_opt->use_ack) || - ((mp_opt->suboptions & OPTION_MPTCP_ADD_ADDR) && !mp_opt->echo)) { + ((mp_opt->suboptions & OPTION_MPTCP_ADD_ADDR) && + (!mp_opt->echo || subflow->mp_join))) { /* subflows are fully established as soon as we get any * additional ack, including ADD_ADDR. */