| Message ID | 20240719-mptcp-pm-avail-v3-1-e96b5591ced3@kernel.org (mailing list archive) |
|---|---|
| State | Superseded, archived |
| Headers | show |
| Series | mptcp: fix endpoints with 'signal' and 'subflow' flags | expand |
| Context | Check | Description |
|---|---|---|
| matttbe/KVM_Validation__normal | success | Success! ✅ |
| matttbe/KVM_Validation__debug | success | Success! ✅ |
| matttbe/KVM_Validation__btf__only_bpftest_all_ | success | Success! ✅ |
| matttbe/checkpatch | success | total: 0 errors, 0 warnings, 0 checks, 9 lines checked |
| matttbe/shellcheck | success | MPTCP selftests files have not been modified |
| matttbe/build | success | Build and static analysis OK |
diff --git a/net/mptcp/options.c b/net/mptcp/options.c index c0832df3b0a3..4ee2e3605f5b 100644 --- a/net/mptcp/options.c +++ b/net/mptcp/options.c @@ -958,7 +958,8 @@ static bool check_fully_established(struct mptcp_sock *msk, struct sock *ssk, if (subflow->remote_key_valid && (((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. */
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") Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org> --- net/mptcp/options.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)