init-ifupdown: support establishing a P2P link

Co-authored-by: Isaac Hermida <isaac.hermida@digi.com>
Signed-off-by: Javier Viguera <javier.viguera@digi.com>

meta-digi-dey/recipes-core/init-ifupdown/init-ifupdown-1.0/p2plink

@@ -0,0 +1,79 @@
+#!/bin/sh
+#
+# Copyright 2019, Digi International Inc.
+#
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, you can obtain one at http://mozilla.org/MPL/2.0/.
+#
+# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+#
+# Description: create P2P link
+#
+# Configuration variables in '/etc/network/interfaces':
+#   Mandatory:
+#     p2p-peer-mac <peer-mac>
+#   Optional:
+#     p2p-discover-window <interval-secs>
+#     p2p-freq <channel-freq>
+#     p2p-local-address <local-ip>
+#     p2p-local-netmask <local-netmask>
+#
+
+# Execute only for the p2p0 interface
+[ "${IFACE}" = "p2p0" ] || exit 0
+
+log() {
+	systemd-cat -p "${1}" -t p2plink printf "%s" "${2}"
+}
+
+# Exit without error if the peer MAC address is not available
+[ -z "${IF_P2P_PEER_MAC}" ] && { log info "Peer MAC address not available"; exit 0; }
+
+# wpa_cli reports lowercase MACs, so convert to lowercase
+IF_P2P_PEER_MAC="$(echo "${IF_P2P_PEER_MAC}" | tr 'A-F' 'a-f')"
+
+if [ "${MODE}" = "start" ]; then
+	wpa_cli -i"${IFACE}" p2p_find && sleep 1
+	for _ in $(seq "${IF_P2P_DISCOVER_WINDOW:=120}"); do
+		wpa_cli -i"${IFACE}" p2p_peers discovered | grep -i -qs "${IF_P2P_PEER_MAC}" && { peer_found="1"; break; }
+		sleep 1
+	done
+	wpa_cli -i"${IFACE}" p2p_stop_find
+	[ -z "${peer_found}" ] && { log err "p2p discover: peer NOT found"; exit 1; }
+
+	# Peer found, establish the link
+	log info "establish P2P link"
+	wpa_cli -i"${IFACE}" p2p_connect "${IF_P2P_PEER_MAC}" pbc go_intent=7 ${IF_P2P_FREQ:+freq=${IF_P2P_FREQ}}
+	for _ in $(seq 20); do
+		if wpa_cli status 2>&1 | grep -qs "^wpa_state=COMPLETED$"; then
+			if wpa_cli status 2>&1 | grep -qs "^mode=P2P GO$"; then
+				# P2P GO side: verify the remote peer has connected
+				wpa_cli all_sta 2>&1 | grep -i -qs "^p2p_device_addr=${IF_P2P_PEER_MAC}$" && p2p_link_found="1"
+			elif wpa_cli status 2>&1 | grep -qs "^mode=station$"; then
+				p2p_link_found="1"
+			fi
+		fi
+		if [ -n "${p2p_link_found}" ]; then
+			# Configure the newly created interface
+			if [ -n "${IF_P2P_LOCAL_ADDRESS}" ]; then
+				for P2P_IFNAME in $(basename $(echo /sys/class/net/p2p-p2p0-*)); do
+					echo "${P2P_IFNAME}" | grep -qs 'p2p-p2p0-\*' && continue
+					ifconfig "${P2P_IFNAME}" "${IF_P2P_LOCAL_ADDRESS}" ${IF_P2P_LOCAL_NETMASK:+netmask ${IF_P2P_LOCAL_NETMASK}} up
+					break
+				done
+			fi
+			break
+		fi
+		sleep 1
+	done
+
+	# Give 'ifupdown' a proper error return value if 'wpa_state' is NOT COMPLETED
+	[ -n "${p2p_link_found}" ] && true || false
+fi

meta-digi-dey/recipes-core/init-ifupdown/init-ifupdown_1.0.bbappend

@@ -8,10 +8,11 @@ INITSCRIPT_PARAMS = "start 03 2 3 4 5 . stop 80 0 6 1 ."
 inherit systemd
 
 SRC_URI_append = " \
+    file://ifupdown.service \
     file://interfaces.br0.example \
     file://interfaces.p2p \
+    file://p2plink \
     file://resolv \
-    file://ifupdown.service \
 "
 
 SRC_URI_append_ccimx6qpsbc = "\
@@ -37,8 +38,10 @@ SYSTEMD_SERVICE_${PN} = "ifupdown.service"
 WPA_DRIVER ?= "nl80211"
 
 do_install_append() {
-	# Install DNS servers handler
+	# Install 'ifupdown' scripts
-	install -m 0755 ${WORKDIR}/resolv ${D}${sysconfdir}/network/if-up.d/resolv
+	install -m 0755 ${WORKDIR}/p2plink ${D}${sysconfdir}/network/if-up.d/
+	install -m 0755 ${WORKDIR}/resolv ${D}${sysconfdir}/network/if-up.d/
+
 	# Install systemd service
 	install -d ${D}${systemd_unitdir}/system/
 	install -m 0644 ${WORKDIR}/ifupdown.service ${D}${systemd_unitdir}/system/