Our documentation is saying that the in-kernel PM is only using fullmesh endpoints to establish subflows to announced addresses when at least one endpoint has a fullmesh flag. But this was not totally correct: only fullmesh endpoints were used if at least one endpoint *from the same address family as the received ADD_ADDR* has the fullmesh flag.
This is confusing, and it seems clearer not to have differences depending on the address family. So, now, when at least one MPTCP endpoint has a fullmesh flag, the local addresses are picked from all fullmesh endpoints, which might be 0 if there are no endpoints for the correct address family. One selftest needs to be adapted for this behaviour change. Reviewed-by: Geliang Tang <[email protected]> Signed-off-by: Matthieu Baerts (NGI0) <[email protected]> --- net/mptcp/pm_kernel.c | 10 +++------- tools/testing/selftests/net/mptcp/mptcp_join.sh | 6 +++++- 2 files changed, 8 insertions(+), 8 deletions(-) diff --git a/net/mptcp/pm_kernel.c b/net/mptcp/pm_kernel.c index e2918c68ff02..e50721c670d0 100644 --- a/net/mptcp/pm_kernel.c +++ b/net/mptcp/pm_kernel.c @@ -609,15 +609,11 @@ fill_local_addresses_vec(struct mptcp_sock *msk, struct mptcp_addr_info *remote, struct mptcp_pm_local *locals) { bool c_flag_case = remote->id && mptcp_pm_add_addr_c_flag_case(msk); - int i; /* If there is at least one MPTCP endpoint with a fullmesh flag */ - if (mptcp_pm_get_endp_fullmesh_max(msk)) { - i = fill_local_addresses_vec_fullmesh(msk, remote, locals, - c_flag_case); - if (i) - return i; - } + if (mptcp_pm_get_endp_fullmesh_max(msk)) + return fill_local_addresses_vec_fullmesh(msk, remote, locals, + c_flag_case); /* If there is at least one MPTCP endpoint with a laminar flag */ if (mptcp_pm_get_endp_laminar_max(msk)) diff --git a/tools/testing/selftests/net/mptcp/mptcp_join.sh b/tools/testing/selftests/net/mptcp/mptcp_join.sh index 78a1aa4ecff2..e7a498dd5a46 100755 --- a/tools/testing/selftests/net/mptcp/mptcp_join.sh +++ b/tools/testing/selftests/net/mptcp/mptcp_join.sh @@ -2952,7 +2952,11 @@ mixed_tests() pm_nl_add_endpoint $ns1 10.0.1.1 flags signal speed=slow \ run_tests $ns1 $ns2 dead:beef:2::1 - chk_join_nr 1 1 1 + if mptcp_lib_kallsyms_has "mptcp_pm_get_endp_fullmesh_max$"; then + chk_join_nr 0 0 0 + else + chk_join_nr 1 1 1 + fi fi # fullmesh still tries to create all the possibly subflows with -- 2.51.0
