Harald Welte | 26bdef2 | 2012-01-16 22:22:17 +0100 | [diff] [blame] | 1 | % MTP3 Message handling; message distribution (HMDT) according to Q.704 |
| 2 | |
| 3 | % (C) 2011-2012 by Harald Welte <laforge@gnumonks.org> |
| 4 | % |
| 5 | % All Rights Reserved |
| 6 | % |
| 7 | % This program is free software; you can redistribute it and/or modify |
| 8 | % it under the terms of the GNU Affero General Public License as |
| 9 | % published by the Free Software Foundation; either version 3 of the |
| 10 | % License, or (at your option) any later version. |
| 11 | % |
| 12 | % This program is distributed in the hope that it will be useful, |
| 13 | % but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | % MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | % GNU General Public License for more details. |
| 16 | % |
| 17 | % You should have received a copy of the GNU Affero General Public License |
| 18 | % along with this program. If not, see <http://www.gnu.org/licenses/>. |
Harald Welte | f8bf032 | 2012-04-16 13:10:47 +0200 | [diff] [blame] | 19 | % |
| 20 | % Additional Permission under GNU AGPL version 3 section 7: |
| 21 | % |
| 22 | % If you modify this Program, or any covered work, by linking or |
| 23 | % combining it with runtime libraries of Erlang/OTP as released by |
| 24 | % Ericsson on http://www.erlang.org (or a modified version of these |
| 25 | % libraries), containing parts covered by the terms of the Erlang Public |
| 26 | % License (http://www.erlang.org/EPLICENSE), the licensors of this |
| 27 | % Program grant you additional permission to convey the resulting work |
| 28 | % without the need to license the runtime libraries of Erlang/OTP under |
| 29 | % the GNU Affero General Public License. Corresponding Source for a |
| 30 | % non-source form of such a combination shall include the source code |
| 31 | % for the parts of the runtime libraries of Erlang/OTP used as well as |
| 32 | % that of the covered work. |
Harald Welte | 26bdef2 | 2012-01-16 22:22:17 +0100 | [diff] [blame] | 33 | |
| 34 | -module(mtp3_hmdt). |
| 35 | -author('Harald Welte <laforge@gnumonks.org>'). |
| 36 | -behaviour(gen_fsm). |
| 37 | |
| 38 | -include("mtp3.hrl"). |
| 39 | |
| 40 | % gen_fsm exports |
| 41 | -export([init/1, terminate/3, code_change/4, handle_event/3, handle_info/3]). |
| 42 | |
| 43 | % individual FSM states |
| 44 | -export([idle/2, own_sp_restart/2]). |
| 45 | |
| 46 | -record(hmdt_state, { |
| 47 | sltc_pid |
| 48 | }). |
| 49 | |
| 50 | %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| 51 | % gen_fsm callbacks |
| 52 | %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| 53 | |
| 54 | init([Sltc]) when is_pid(Sltc) -> |
| 55 | HmdtState = #hmdt_state{sltc_pid = Sltc}, |
| 56 | {ok, idle, HmdtState}. |
| 57 | |
| 58 | terminate(Reason, State, _LoopDat) -> |
| 59 | io:format("Terminating ~p in State ~p (Reason: ~p)~n", |
| 60 | [?MODULE, State, Reason]), |
| 61 | ok. |
| 62 | |
| 63 | code_change(_OldVsn, StateName, LoopDat, _Extra) -> |
| 64 | {ok, StateName, LoopDat}. |
| 65 | |
| 66 | handle_event(Event, State, LoopDat) -> |
| 67 | io:format("Unknown Event ~p in state ~p~n", [Event, State]), |
| 68 | {next_state, State, LoopDat}. |
| 69 | |
| 70 | handle_info(Info, State, LoopDat) -> |
| 71 | io:format("Unknown Info ~p in state ~p~n", [Info, State]), |
| 72 | {next_state, State, LoopDat}. |
| 73 | |
| 74 | % See Figure 2 of Q.707 |
| 75 | |
| 76 | %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| 77 | % STATE: idle |
| 78 | %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| 79 | |
| 80 | idle(M=#mtp3_msg{service_ind=Sio}, LoopDat) -> |
| 81 | handle_mtp3(Sio, M, LoopDat), |
| 82 | {next_state, idle, LoopDat}; |
| 83 | |
| 84 | idle(restart_begins, LoopDat) -> |
| 85 | {next_state, own_sp_restart, LoopDat}. |
| 86 | |
| 87 | %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| 88 | % STATE: own_sp_restart |
| 89 | %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| 90 | |
| 91 | own_sp_restart(M=#mtp3_msg{service_ind=Sio}, LoopDat) when |
| 92 | Sio == ?MTP3_SERV_MGMT; Sio == ?MTP3_SERV_MTN -> |
| 93 | handle_mtp3(Sio, M, LoopDat), |
| 94 | {next_state, own_sp_restart, LoopDat}; |
| 95 | |
| 96 | own_sp_restart(restart_ends, LoopDat) -> |
| 97 | {next_state, idle, LoopDat}. |
| 98 | |
| 99 | |
| 100 | %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| 101 | % helper functions |
| 102 | %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| 103 | |
| 104 | handle_mtp3(?MTP3_SERV_MTN, Mtp3, LoopDat) -> |
| 105 | io:format("SIO ~p HMDT -> SLTC~n", [?MTP3_SERV_MTN]), |
| 106 | gen_fsm:send_event(LoopDat#hmdt_state.sltc_pid, Mtp3); |
| 107 | handle_mtp3(?MTP3_SERV_MGMT, Mtp3, LoopDat) -> |
| 108 | io:format("SIO ~p HMDT -> NULL~n", [?MTP3_SERV_MGMT]), |
| 109 | % FIXME: distinguish between SRM, SLM and STM |
| 110 | ok; |
| 111 | handle_mtp3(Sio, Mtp3, LoopDat) -> |
| 112 | io:format("SIO ~p HMDT -> ss7_links~n", [Sio]), |
| 113 | % deliver to subsystem |
| 114 | ss7_links:mtp3_rx(Mtp3), |
| 115 | % FIXME: Send UPU! ? |
| 116 | ok. |