180 lines
5.4 KiB
Erlang
180 lines
5.4 KiB
Erlang
% Internal SS7 route database keeping
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% (C) 2011-2013 by Harald Welte <laforge@gnumonks.org>
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%
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% All Rights Reserved
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%
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% This program is free software; you can redistribute it and/or modify
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% it under the terms of the GNU Affero General Public License as
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% published by the Free Software Foundation; either version 3 of the
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% License, or (at your option) any later version.
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%
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% This program is distributed in the hope that it will be useful,
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% but WITHOUT ANY WARRANTY; without even the implied warranty of
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% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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% GNU General Public License for more details.
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%
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% You should have received a copy of the GNU Affero General Public License
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% along with this program. If not, see <http://www.gnu.org/licenses/>.
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%
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% Additional Permission under GNU AGPL version 3 section 7:
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%
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% If you modify this Program, or any covered work, by linking or
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% combining it with runtime libraries of Erlang/OTP as released by
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% Ericsson on http://www.erlang.org (or a modified version of these
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% libraries), containing parts covered by the terms of the Erlang Public
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% License (http://www.erlang.org/EPLICENSE), the licensors of this
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% Program grant you additional permission to convey the resulting work
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% without the need to license the runtime libraries of Erlang/OTP under
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% the GNU Affero General Public License. Corresponding Source for a
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% non-source form of such a combination shall include the source code
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% for the parts of the runtime libraries of Erlang/OTP used as well as
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% that of the covered work.
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% this module is keeping the point code routing table for the MTP3 layer
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% of the Omsocom SS7 protocol stack. Routes are created and deleted
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% with create_route() and delete_route(), the arguments are
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% * destination point code
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% * point code mask
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% * name of the linkset
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%
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% there is one function to actually make a routing decision: route_dpc/1
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% with a single argument: the destination point code.
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-module(ss7_routes).
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-behaviour(gen_server).
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-include_lib("osmo_ss7/include/mtp3.hrl").
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% gen_fsm callbacks
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-export([init/1, handle_call/3, handle_info/2, terminate/2, code_change/3]).
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% our published API
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-export([start_link/0]).
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% client functions, may internally talk to our sccp_user server
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-export([create_route/3, delete_route/3, flush_routes/0]).
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-export([dump/0]).
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-export([route_dpc/1]).
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-export([reload_config/0]).
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-record(ss7route, {
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remote_pc_mask, % {remote_pc, remote_pc_mask}
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linkset_name
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}).
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-record(sr_state, {
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route_tbl
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}).
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% initialization code
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start_link() ->
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gen_server:start_link({local, ?MODULE}, ?MODULE, [], [{debug, [trace]}]).
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init(_Arg) ->
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RouteTbl = ets:new(ss7_routes, [ordered_set, named_table,
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{keypos, #ss7route.remote_pc_mask}]),
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process_flag(trap_exit, true),
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{ok, #sr_state{route_tbl = RouteTbl}}.
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% client side API
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% all write operations go through gen_server:call(), as only the ?MODULE
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% process has permission to modify the table content
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create_route(RemotePcIn, RemoteMask, LinksetName) ->
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RemotePc = osmo_util:pointcode2int(RemotePcIn),
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gen_server:call(?MODULE, {create_route, {RemotePc, RemoteMask, LinksetName}}).
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delete_route(RemotePcIn, RemoteMask, LinksetName) ->
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RemotePc = osmo_util:pointcode2int(RemotePcIn),
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gen_server:call(?MODULE, {delete_route, {RemotePc, RemoteMask, LinksetName}}).
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flush_routes() ->
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gen_server:call(?MODULE, flush_routes).
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% the lookup functions can directly use the ets named_table from within
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% the client process, no need to go through a synchronous IPC
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route_dpc(DpcIn) ->
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Dpc = osmo_util:pointcode2int(DpcIn),
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% this was generated by ets:fun2ms() on the shell
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Match = [{#ss7route{remote_pc_mask={'$1','$2'},linkset_name='$3'},
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[{'==',{'band',Dpc,'$2'},'$1'}],
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['$3']}],
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case ets:select(ss7_routes, Match) of
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[Name|_] ->
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{ok, Name};
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_ ->
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{error, no_route}
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end.
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dump() ->
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List = ets:tab2list(ss7_routes),
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dump_routes(List).
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dump_routes([]) ->
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ok;
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dump_routes([Head|Tail]) when is_record(Head, ss7route) ->
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dump_single_route(Head),
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dump_routes(Tail).
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dump_single_route(#ss7route{remote_pc_mask = {Pc, Mask},
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linkset_name = Name}) ->
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PcTuple = osmo_util:pointcode_fmt(itu, Pc),
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MaskTuple = osmo_util:pointcode_fmt(itu, Mask),
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io:format("Dest PC ~p/~p -> Linkset ~p~n",
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[PcTuple, MaskTuple, Name]).
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% server side code
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handle_call({create_route, {RemotePc, RemoteMask, Name}},
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{_FromPid, _FromRef}, S) ->
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#sr_state{route_tbl = Tbl} = S,
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R = #ss7route{remote_pc_mask = {RemotePc, RemoteMask},
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linkset_name = Name},
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case ets:insert_new(Tbl, R) of
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false ->
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{reply, {error, ets_insert}, S};
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_ ->
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{reply, ok, S}
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end;
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handle_call(flush_routes, {_FromPid, _FromRef}, S) ->
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#sr_state{route_tbl = Tbl} = S,
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ets:delete_all_objects(Tbl),
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{reply, ok, S};
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handle_call({delete_route, {RemotePc, RemoteMask, _Name}},
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{_FromPid, _FromRef}, S) ->
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#sr_state{route_tbl = Tbl} = S,
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ets:delete(Tbl, {RemotePc, RemoteMask}),
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{reply, ok, S}.
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handle_info(Info, S) ->
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error_logger:error_report(["unknown handle_info",
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{module, ?MODULE},
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{info, Info}, {state, S}]),
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{noreply, S}.
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terminate(Reason, _S) ->
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io:format("terminating ~p with reason ~p", [?MODULE, Reason]),
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ok.
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code_change(_OldVsn, State, _Extra) ->
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{ok, State}.
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reconfig_route({Dpc, Mask, Dest}) ->
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case create_route(Dpc, Mask, Dest) of
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ok -> true;
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_ -> false
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end.
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reload_config() ->
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flush_routes(),
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Routes = osmo_util:get_env(osmo_ss7, routes, []),
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lists:all(fun reconfig_route/1, Routes).
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