pespin has submitted this change. ( https://gerrit.osmocom.org/c/erlang/osmo-s1gw/+/37857?usp=email )
Change subject: erab_fsm: properly omit Network Instance IE ......................................................................
erab_fsm: properly omit Network Instance IE
If the access/core Network Instance IE value is not configured, the 'network_instance' field shall not be added to PDRs and FARs. Otherwise we hit a function_clause exception in pfcplib.
Change-Id: I643a23eeb1cfb699cda44f973cb8098edb0a9a83 Fixes: 3d8119c "erab_fsm: include Network Instance IE in PDRs and FARs" --- M src/erab_fsm.erl 1 file changed, 42 insertions(+), 28 deletions(-)
Approvals: pespin: Looks good to me, approved Jenkins Builder: Verified laforge: Looks good to me, but someone else must approve
diff --git a/src/erab_fsm.erl b/src/erab_fsm.erl index 931b47f..544f5ab 100644 --- a/src/erab_fsm.erl +++ b/src/erab_fsm.erl @@ -81,6 +81,10 @@
-type erab_state() :: #erab_state{}.
+-type iface() :: 'Core' | 'Access'. +-type pfcp_ie() :: map(). + + %% ------------------------------------------------------------------ %% public API %% ------------------------------------------------------------------ @@ -375,68 +379,78 @@ logger:set_process_metadata(#{prefix => Prefix}).
--spec net_inst(atom()) -> undefined | binary(). -net_inst(Param) -> - case application:get_env(osmo_s1gw, Param) of - {ok, Val} -> Val; - undefined -> undefined - end. - - -spec session_establish_req(erab_state()) -> pfcp_peer:pfcp_session_rsp(). session_establish_req(#erab_state{seid_loc = F_SEID, %% used as F-SEID u2c = U2C}) -> - %% Network Instance IE values for core/access - NI_Core = net_inst(pfcp_net_inst_core), - NI_Access = net_inst(pfcp_net_inst_access), %% Packet Detection Rules OHR = #outer_header_removal{header = 'GTP-U/UDP/IPv4'}, PDRs = [#{pdr_id => {pdr_id, 1}, %% -- for Core -> Access far_id => {far_id, 1}, %% see FARs below precedence => {precedence, 255}, outer_header_removal => OHR, - pdi => #{f_teid => #f_teid{teid = choose, - ipv4 = choose}, - network_instance => NI_Core, - source_interface => {source_interface, 'Core'}}}, + pdi => pdi('Core')}, #{pdr_id => {pdr_id, 2}, %% -- for Access -> Core far_id => {far_id, 2}, %% see FARs below precedence => {precedence, 255}, outer_header_removal => OHR, - pdi => #{f_teid => #f_teid{teid = choose, - ipv4 = choose}, - network_instance => NI_Access, - source_interface => {source_interface, 'Access'}}}], + pdi => pdi('Access')}], %% Forwarding Action Rules + FPars = #{outer_header_creation => ohc(U2C), + destination_interface => {destination_interface, 'Core'}}, + FParsNI = add_net_inst(FPars, 'Core'), %% optional Network Instance IE FARs = [#{far_id => {far_id, 1}, %% -- for Core -> Access %% We don't know the Access side TEID / GTP-U address yet, so we set %% this FAR to DROP and modify it when we get E-RAB SETUP RESPONSE. apply_action => #{'DROP' => []}}, #{far_id => {far_id, 2}, %% -- for Access -> Core apply_action => #{'FORW' => []}, - forwarding_parameters => - #{outer_header_creation => ohc(U2C), - network_instance => NI_Core, - destination_interface => {destination_interface, 'Core'}}}], + forwarding_parameters => FParsNI}], pfcp_peer:session_establish_req(F_SEID, PDRs, FARs).
-spec session_modify_req(erab_state()) -> pfcp_peer:pfcp_session_rsp(). session_modify_req(#erab_state{seid_rem = SEID, %% SEID allocated to us u2a = U2A}) -> - %% Network Instance IE value for access - NI_Access = net_inst(pfcp_net_inst_access), %% Forwarding Action Rules + FPars = #{outer_header_creation => ohc(U2A)}, + FParsNI = add_net_inst(FPars, 'Access'), %% optional Network Instance IE FARs = [#{far_id => {far_id, 1}, %% -- for Core -> Access %% Now we know the Access side TEID / GTP-U address, so we modify %% this FAR (which was previously set to DROP) to FORW. apply_action => #{'FORW' => []}, - update_forwarding_parameters => - #{outer_header_creation => ohc(U2A), - network_instance => NI_Access}}], + update_forwarding_parameters => FParsNI}], pfcp_peer:session_modify_req(SEID, [], FARs).
+%% Network Instance IE env parameter name +-spec net_inst_param(iface()) -> atom(). +net_inst_param('Core') -> pfcp_net_inst_core; +net_inst_param('Access') -> pfcp_net_inst_access. + + +%% if configured, add Network Instance IE (optional) +-spec add_net_inst(pfcp_ie(), iface()) -> pfcp_ie(). +add_net_inst(IE, Iface) -> + Param = net_inst_param(Iface), + case application:get_env(osmo_s1gw, Param) of + {ok, NI} -> + IE#{network_instance => NI}; + undefined -> + IE + end. + + +%% Packet Detection Information IE generator +-spec pdi(iface()) -> pfcp_ie(). +pdi(SrcIface) -> + IE = #{f_teid => #f_teid{teid = choose, + ipv4 = choose}, + source_interface => {source_interface, SrcIface}}, + %% if configured, add Network Instance IE (optional) + add_net_inst(IE, SrcIface). + + +%% Outer Header Creation IE generator ohc({TEID, Addr}) -> OHC = #outer_header_creation{n6 = false, n19 = false,
-
pespin