| % M2UA in accordance with RFC3331 (http://tools.ietf.org/html/rfc3331) |
| |
| % (C) 2011-2012 by Harald Welte <laforge@gnumonks.org> |
| % |
| % All Rights Reserved |
| % |
| % This program is free software; you can redistribute it and/or modify |
| % it under the terms of the GNU Affero General Public License as |
| % published by the Free Software Foundation; either version 3 of the |
| % License, or (at your option) any later version. |
| % |
| % This program is distributed in the hope that it will be useful, |
| % but WITHOUT ANY WARRANTY; without even the implied warranty of |
| % MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| % GNU General Public License for more details. |
| % |
| % You should have received a copy of the GNU Affero General Public License |
| % along with this program. If not, see <http://www.gnu.org/licenses/>. |
| |
| -module(sctp_m2ua). |
| -author('Harald Welte <laforge@gnumonks.org>'). |
| -behaviour(sctp_core). |
| |
| -include_lib("kernel/include/inet_sctp.hrl"). |
| -include("osmo_util.hrl"). |
| -include("m2ua.hrl"). |
| |
| -export([init/1, terminate/3, code_change/4, handle_event/3, handle_info/3]). |
| |
| -export([rx_sctp/4, mtp_xfer/2, state_change/3, prim_up/3]). |
| |
| -record(m2ua_state, { |
| asp_pid, |
| last_bsn_received, |
| last_fsn_sent |
| }). |
| |
| %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| % gen_fsm callbacks |
| %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| |
| init(_InitOpts) -> |
| {ok, Asp} = gen_fsm:start_link(xua_asp_fsm, [sua_asp, [], Fun, [self()], self()], [{debug, [trace]}]), |
| {ok, #m2ua_state{last_bsn_received=16#ffffff, last_fsn_sent=16#ffffff, asp_pid=Asp}} |
| |
| terminate(Reason, _State, _LoopDat) -> |
| io:format("Terminating ~p (Reason ~p)~n", [?MODULE, Reason]), |
| ok. |
| |
| code_change(_OldVsn, _State, LoopDat, _Extra) -> |
| {ok, LoopDat}. |
| |
| handle_event(_Event, State, LoopDat) -> |
| {next_state, State, LoopDat}. |
| |
| handle_info(_Info, State, LoopDat) -> |
| {next_state, State, LoopDat}. |
| |
| %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| % sctp_core callbacks |
| %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| |
| prim_up(#primitive{subsystem='M', gen_name = 'SCTP_ESTABLISH', spec_name = confirm}, State, LoopDat) -> |
| Asp = LoopDat#m2ua_state.asp_pid, |
| gen_fsm:send_event(Asp, osmo_util:make_prim('M','ASP_UP',request)), |
| {ignore, LoopDat}; |
| prim_up(#primitive{subsystem='M', gen_name = 'ASP_UP', spec_name = confirm}, State, LoopDat) -> |
| Asp = LoopDat#m2ua_state.asp_pid, |
| gen_fsm:send_event(Asp, osmo_util:make_prim('M','ASP_ACTIVE',request)), |
| {ignore, LoopDat}; |
| prim_up(Prim, State, LoopDat) -> |
| % default: forward all primitives to the user |
| {ok, Prim, LoopDat}. |
| |
| |
| % sctp_core indicates that we have received some data... |
| rx_sctp(#sctp_sndrcvinfo{ppid = ?M2UA_PPID}, Data, State, LoopDat) -> |
| Asp = LoopDat#m2ua_state.asp_pid, |
| {ok, M2ua} = xua_codec:parse_msg(Data), |
| % FIXME: check sequenc number linearity |
| case M2ua of |
| #xua_msg{msg_class = ?M3UA_MSGC_SSNM} -> |
| % FIXME |
| {ignore, LoopDat}; |
| #xua_msg{msg_class = ?M3UA_MSGC_ASPSM} -> |
| gen_fsm:send_event(Asp, M2ua), |
| {ignore, LoopDat}; |
| #xua_msg{msg_class = ?M3UA_MSGC_ASPTM} -> |
| gen_fsm:send_event(Asp, M2ua), |
| {ignore, LoopDat}; |
| #xua_msg{msg_class = ?M2UA_CLASS_M2UA, |
| msg_type = ?M2UA_TYPE_USER} -> |
| Mtp3 = M2pa#m2pa_msg.mtp3, |
| case LoopDat#m2pa_state.msu_fisu_accepted of |
| 1 -> |
| LoopDat2 = LoopDat#m2pa_state{last_bsn_received = FsnRecv}, |
| case Mtp3 of |
| undefined -> |
| ok; |
| _ -> |
| send_userdata_ack(LoopDat2) |
| end, |
| gen_fsm:send_event(LoopDat#m2pa_state.lsc_pid, fisu_msu_received), |
| Prim = osmo_util:make_prim('MTP','TRANSFER',indication, Mtp3), |
| {ok, Prim, LoopDat2}; |
| _ -> |
| {ignore, LoopDat} |
| end; |
| _ -> |
| % do something with link related msgs |
| io:format("M2UA Unknown message ~p in state ~p~n", [M2pa, State]), |
| {ignore, State, LoopDat} |
| end. |
| |
| % MTP-TRANSFER.req has arrived at sctp_core, encapsulate+tx it |
| mtp_xfer(Mtp3, LoopDat) -> |
| Fsn = inc_seq_nr(LoopDat#m2pa_state.last_fsn_sent), |
| M2ua = #xua_msg{msg_class = ?M2UA_CLASS_M2UA, |
| msg_type = ?M2UA_TYPE_USER, |
| mtp3 = Mtp3}, |
| M2paBin = xua_codec:encode_msg(M2ua), |
| tx_sctp(?M2UA_STREAM_USER, M2paBin), |
| LoopDat2. |
| |
| state_change(_, established, LoopDat) -> |
| % emulate a 'start' from LSC |
| %gen_fsm:send_event(LoopDat#m2pa_state.lsc_pid, start), |
| LoopDat; |
| state_change(established, _, LoopDat) -> |
| %gen_fsm:send_event(LoopDat#m2pa_state.lsc_pid, link_failure), |
| LoopDat; |
| state_change(_, _, LoopDat) -> |
| LoopDat. |
| |
| |
| %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| % helper functions |
| %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| |
| tx_sctp(Stream, Payload) when is_integer(Stream), is_binary(Payload) -> |
| Param = {Stream, ?M2UA_PPID, Payload}, |
| % sent to 'ourselves' (behaviour master module) |
| gen_fsm:send_event(self(), osmo_util:make_prim('SCTP','TRANSFER',request,Param)). |