Dockerize the gw

Dockerfile

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+FROM alpine:3.19 as buildenv
+
+RUN apk add --no-cache git ca-certificates \
+	libmnl-dev build-base make automake autoconf libtool pkgconfig
+
+RUN git clone https://gitea.osmocom.org/cellular-infrastructure/libgtpnl \
+	&& cd /libgtpnl && autoreconf -fi && ./configure && make
+
+FROM alpine:3.19
+
+WORKDIR /nf-gtp-gw
+
+COPY --from=buildenv /libgtpnl/src/.libs/libgtpnl.so* /usr/lib/
+COPY --from=buildenv /libgtpnl/tools/.libs/* .
+COPY ./startup.sh ./
+
+RUN apk add --no-cache libmnl iproute2 \
+	&& ldconfig /
+
+ENV TEID_N3_GNB=100 \
+    TEID_N3_UPF=200 \
+    N3_UPF_IP=127.0.0.1 \
+    N6_APP_SERVER_IP=127.0.0.2 \
+    N6_APP_SERVER_SUBNET=127.0.0.0/8
+
+ENTRYPOINT ["./startup.sh"]

startup.sh

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+#!/bin/sh
+
+# User defined variables
+#TEID_N3_UPF
+#TEID_N3_GNB
+#N3_UPF_IP
+#N6_APP_SERVER_IP
+#N6_APP_SERVER_SUBNET
+
+# Pre-defined variables
+IP_VERSION="ip"
+MTU=1500
+GTP_DEV="ue-tun"
+
+function log {
+    echo -e "[INFO] $1"
+    sleep 1
+}
+
+function start {
+    log "create gtp devices (run in bg mode)"
+    ./gtp-link add $GTP_DEV $IP_VERSION &
+
+    log "configure mtu of gtp devices"
+    ip link set mtu $MTU dev $GTP_DEV
+
+    log "create gtp tunnel: [TEID_N3_GNB=$TEID_N3_GNB, TEID_N3_UPF=$TEID_N3_UPF, \
+        N3_UPF_IP=$N3_UPF_IP, N6_APP_SERVER_IP=$N6_APP_SERVER_IP]"
+    ./gtp-tunnel add $GTP_DEV v1 $TEID_N3_UPF $TEID_N3_GNB $N6_APP_SERVER_IP $N3_UPF_IP
+    log "$(./gtp-tunnel list)"
+
+    log "configure routes using gtp devices"
+    ip route add $N6_APP_SERVER_SUBNET dev $GTP_DEV
+}
+
+start
+sleep infinity