hook up the existing m2ua code into the ss7_link infrastructure

After this commit, it is possible to add #sigtran_link{type=m2ua}
using the osmo_ss7_sup:add_mtp_link() API.

The actual M2UA code appears to be incomplete at this point

3 files changed, 140 insertions, 0 deletions

diff --git a/ebin/osmo_ss7.app b/ebin/osmo_ss7.app
index fdf510f..4cb4f2a 100644
--- a/ebin/osmo_ss7.app
+++ b/ebin/osmo_ss7.app
@@ -16,6 +16,7 @@
 			sccp_codec,
 			osmo_ss7_sup, osmo_ss7_app,
 			ss7_links, ss7_link_m3ua, ss7_link_ipa_client,
+			ss7_link_m2ua,
 			ss7_routes,
 			ss7_service_dump,
 			osmo_ss7_gtt,
diff --git a/src/osmo_ss7_sup.erl b/src/osmo_ss7_sup.erl
index dddc9ff..72637ec 100644
--- a/src/osmo_ss7_sup.erl
+++ b/src/osmo_ss7_sup.erl
@@ -56,6 +56,12 @@ add_mtp_link(L=#sigtran_link{type = m3ua, name = Name,
 	ChildSpec = {ChildName, {ss7_link_m3ua, start_link, [L]},
 		     permanent, 2000, worker, [ss7_link_m3ua]},
 	supervisor:start_child(?MODULE, ChildSpec);
+add_mtp_link(L=#sigtran_link{type = m2ua, name = Name,
+			   local = Local, remote = Remote}) ->
+	ChildName = list_to_atom("ss7_link_m2ua_" ++ Name),
+	ChildSpec = {ChildName, {ss7_link_m2ua, start_link, [L]},
+		     permanent, 2000, worker, [ss7_link_m2ua]},
+	supervisor:start_child(?MODULE, ChildSpec);
 add_mtp_link(L=#sigtran_link{type = ipa_client, name = Name}) ->
 	ChildName = list_to_atom("ss7_link_ipa_client_" ++ Name),
 	ChildSpec = {ChildName, {ss7_link_ipa_client, start_link, [L]},
diff --git a/src/ss7_link_m2ua.erl b/src/ss7_link_m2ua.erl
new file mode 100644
index 0000000..494f042
--- /dev/null
+++ b/src/ss7_link_m2ua.erl
@@ -0,0 +1,133 @@
+% Osmocom adaptor to interface the M2UA core with osmo_sccp
+
+% (C) 2013 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/>.
+%
+% Additional Permission under GNU AGPL version 3 section 7:
+%
+% If you modify this Program, or any covered work, by linking or
+% combining it with runtime libraries of Erlang/OTP as released by
+% Ericsson on http://www.erlang.org (or a modified version of these
+% libraries), containing parts covered by the terms of the Erlang Public
+% License (http://www.erlang.org/EPLICENSE), the licensors of this
+% Program grant you additional permission to convey the resulting work
+% without the need to license the runtime libraries of Erlang/OTP under
+% the GNU Affero General Public License. Corresponding Source for a
+% non-source form of such a combination shall include the source code
+% for the parts of the runtime libraries of Erlang/OTP used as well as
+% that of the covered work.
+
+-module(ss7_link_m2ua).
+-author('Harald Welte <laforge@gnumonks.org>').
+-behavior(gen_server).
+
+-include_lib("osmo_ss7/include/osmo_util.hrl").
+-include_lib("osmo_ss7/include/m2ua.hrl").
+-include_lib("osmo_ss7/include/sccp.hrl").
+-include_lib("osmo_ss7/include/osmo_ss7.hrl").
+
+-export([start_link/1, init/1]).
+
+-export([handle_cast/2]).
+
+-record(loop_dat, {
+	 m2ua_pid,
+	 link
+	}).
+
+start_link(Args) ->
+	gen_server:start_link(?MODULE, Args, [{debug, [trace]}]).
+
+init(L = #sigtran_link{type = m2ua, name = Name, linkset_name = LinksetName,
+		       sls = Sls, local = Local, remote = Remote}) ->
+	#sigtran_peer{ip = LocalIp, port = LocalPort} = Local,
+	#sigtran_peer{ip = RemoteIp, port = RemotePort} = Remote,
+	% start the M2UA link to the SG
+	Opts = [{module, sctp_m2ua}, {module_args, []},
+		{user_pid, self()}, {sctp_remote_ip, RemoteIp},
+		{sctp_remote_port, RemotePort}, {sctp_local_port, LocalPort},
+		{user_fun, fun m2ua_tx_to_user/2}, {user_args, self()}],
+	{ok, M2uaPid} = sctp_core:start_link(Opts),
+	% FIXME: register this link with SCCP_SCRC
+	ok = ss7_links:register_link(LinksetName, Sls, Name),
+	{ok, #loop_dat{m2ua_pid = M2uaPid, link = L}}.
+
+%	% instantiate SCCP routing instance
+%	{ok, ScrcPid} = sccp_scrc:start_link([{mtp_tx_action, {callback_fn, fun scrc_tx_to_mtp/2, M3uaPid}}]),
+%	loop(#loop_dat{m2ua_pid = M3uaPid, scrc_pid = ScrcPid}).
+
+
+set_link_state(#sigtran_link{linkset_name = LinksetName, sls = Sls}, State) ->
+	ok = ss7_links:set_link_state(LinksetName, Sls, State).
+
+scrc_tx_to_mtp(Prim, Args) ->
+	M2uaPid = Args,
+	gen_fsm:send_event(M2uaPid, Prim).
+
+% Callback that we pass to the m3ua_core, which it will call when it wants to
+% send a primitive up the stack to SCCP
+m2ua_tx_to_user(P=#primitive{subsystem = 'MTP'}, Args) ->
+	% send it directly to the 'service' that has bound
+	ss7_links:mtp3_rx(P);
+m2ua_tx_to_user(P=#primitive{subsystem = 'M'}, Args) ->
+	% send management primitives into the m2ua_link process
+	UserPid = Args,
+	gen_server:cast(UserPid, P).
+
+handle_cast(P = #primitive{subsystem = 'MTP', gen_name = 'TRANSFER', spec_name = request}, L) ->
+	scrc_tx_to_mtp(P, L#loop_dat.m2ua_pid),
+	{noreply, L};
+% This is what we receive from m2ua_tx_to_user/2
+handle_cast(#primitive{subsystem = 'M', gen_name = 'SCTP_ESTABLISH', spec_name = confirm}, L) ->
+	io:format("~p: SCTP_ESTABLISH.ind -> ASP_UP.req~n", [?MODULE]),
+	gen_fsm:send_event(L#loop_dat.m2ua_pid, osmo_util:make_prim('M','ASP_UP',request)),
+	{noreply, L};
+handle_cast(#primitive{subsystem = 'M', gen_name = 'ASP_UP', spec_name = confirm}, L) ->
+	io:format("~p: ASP_UP.ind -> ASP_ACTIVE.req~n", [?MODULE]),
+	set_link_state(L#loop_dat.link, up),
+	gen_fsm:send_event(L#loop_dat.m2ua_pid, osmo_util:make_prim('M','ASP_ACTIVE',request)),
+	{noreply, L};
+handle_cast(#primitive{subsystem = 'M', gen_name = 'ASP_ACTIVE', spec_name = confirm}, L) ->
+	io:format("~p: ASP_ACTIVE.ind - M2UA now active and ready~n", [?MODULE]),
+	set_link_state(L#loop_dat.link, active),
+	%tx_sccp_udt(L#loop_dat.scrc_pid),
+	{noreply, L};
+handle_cast(#primitive{subsystem = 'M', gen_name = 'ASP_DOWN'}, L) ->
+	io:format("~p: ASP_DOWN.ind~n", [?MODULE]),
+	set_link_state(L#loop_dat.link, down),
+	{noreply, L};
+handle_cast(#primitive{subsystem = 'M', gen_name = 'ASP_INACTIVE'}, L) ->
+	io:format("~p: ASP_INACTIVE.ind~n", [?MODULE]),
+	set_link_state(L#loop_dat.link, up),
+	{noreply, L};
+handle_cast(P, L) ->
+	io:format("~p: Ignoring M2UA prim ~p~n", [?MODULE, P]),
+	{noreply, L}.
+
+terminate(Reason, _S) ->
+	io:format("terminating ~p with reason ~p", [?MODULE, Reason]),
+	ok.
+
+tx_sccp_udt(ScrcPid) ->
+	CallingP = #sccp_addr{ssn = ?SCCP_SSN_MSC, point_code = osmo_util:pointcode2int(itu, {1,2,2})},
+	CalledP = #sccp_addr{ssn = ?SCCP_SSN_HLR, point_code = osmo_util:pointcode2int(itu, {1,1,1})},
+	Data = <<1,2,3,4>>,
+	Opts = [{protocol_class, 0}, {called_party_addr, CalledP},
+		{calling_party_addr, CallingP}, {user_data, Data}],
+	io:format("~p: Sending N-UNITDATA.req to SCRC~n", [?MODULE]),
+	gen_fsm:send_event(ScrcPid, osmo_util:make_prim('N','UNITDATA',request,Opts)).
+