lynxis lazus has uploaded this change for review.

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epdg_gtpc_s2b: add TLV Serving Network

The open5gs requires Serving Network TLV.

Change-Id: I2a9459859fc660e6433cd8178ab9d1f92ae74fc0
---
M src/epdg_gtpc_s2b.erl
A src/gtp_utils.erl
2 files changed, 63 insertions(+), 3 deletions(-)

git pull ssh://gerrit.osmocom.org:29418/erlang/osmo-epdg refs/changes/18/35218/1

diff --git a/src/epdg_gtpc_s2b.erl b/src/epdg_gtpc_s2b.erl
index a5658f1..a71e71d 100644
--- a/src/epdg_gtpc_s2b.erl
+++ b/src/epdg_gtpc_s2b.erl
@@ -59,6 +59,9 @@
 
 %% TODO: make APN configurable? get it from HSS?
 -define(APN, <<"internet">>).
+-define(MCC, 901).
+-define(MNC, 42).
+-define(MNC_SIZE, 42).
 
 -record(gtp_state, {
         socket,
@@ -330,7 +333,10 @@
             #v2_access_point_name{instance = 0, apn = [Apn]},
             #v2_selection_mode{mode = 0},
             #v2_pdn_address_allocation{type = ipv4, address = <<0,0,0,0>>},
-            #v2_bearer_context{group = BearersIE}
+            #v2_bearer_context{group = BearersIE},
+            #v2_serving_network{
+                    plmn_id = gtp_utils:plmn_to_bin(?MCC, ?MNC, ?MNC_SIZE)
+            }
           ],
     #gtp{version = v2, type = create_session_request, tei = 0, seq_no = SeqNo, ie = IEs}.
 
@@ -346,5 +352,3 @@
          tei = RemoteCtlTEI,
          seq_no = Req#gtp.seq_no,
          ie = IEs}.
-
-
diff --git a/src/gtp_utils.erl b/src/gtp_utils.erl
new file mode 100644
index 0000000..b899530
--- /dev/null
+++ b/src/gtp_utils.erl
@@ -0,0 +1,45 @@
+% GTP utilities
+%
+% (C) 2023 by sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
+% Author: Alexander Couzens <lynxis@fe80.eu>
+%
+% 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(gtp_utils).
+-author('Alexander Couzens <lynxis@fe80.eu>').
+
+-export([plmn_to_bin/3]).
+
+% ergw/apps/ergw/test/*.erl
+% under GPLv2+
+plmn_to_bin(CC, NC, NCSize) ->
+    MCC = iolist_to_binary(io_lib:format("~3..0b", [CC])),
+    MNC = iolist_to_binary(io_lib:format("~*..0b", [NCSize, NC])),
+    {MCC, MNC}.

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