net: add qmi interface support

qmi is useful for cellular modem connection, the management interface is
implemented using libqmi's qmicli utility.

Signed-off-by: Alon Bar-Lev <alon.barlev@gmail.com>
Signed-off-by: Robin H. Johnson <robbat2@gentoo.org>
Closes: https://github.com/gentoo/netifrc/pull/44

3 files changed, 147 insertions, 1 deletions

diff --git a/doc/net.example.Linux.in b/doc/net.example.Linux.in
index 42b8071..cbd81e7 100644
--- a/doc/net.example.Linux.in
+++ b/doc/net.example.Linux.in
@@ -1133,6 +1133,19 @@
 #config_l2tpeth2="10.100.2.1/24"
 
 #-----------------------------------------------------------------------------
+# QMI
+# For QMI support, emerge net-libs/libqmi
+# QMI is used for some cellular modems.
+#
+# Each QMI interface may have the following configuration:
+#qmi_apn_wwan0=				# The name of the APN
+#qmi_auth_wwan0=			# none, pop, chap, both, Default: none
+#qmi_username_wwan0=			# Default: dummy
+#qmi_password_wwan0=			# Default dummy
+#qmi_cdc_wwan0=				# Default: /dev/cdc-wmiX where X is taken from IFACE
+#-----------------------------------------------------------------------------
+
+#-----------------------------------------------------------------------------
 # Advanced Routing
 # WARNING: For advanced routing you MUST be using sys-apps/iproute2
 #
diff --git a/net/Makefile b/net/Makefile
index 58483cd..f562d15 100644
--- a/net/Makefile
+++ b/net/Makefile
@@ -14,7 +14,7 @@ INC-Linux=	adsl.sh apipa.sh arping.sh bonding.sh br2684ctl.sh bridge.sh \
 		ccwgroup.sh clip.sh ethtool.sh iproute2.sh ifplugd.sh ip6to4.sh \
 		ipppd.sh iwconfig.sh netplugd.sh pppd.sh pump.sh tuntap.sh udhcpc.sh \
 		vlan.sh macvlan.sh ip6rd.sh firewalld.sh dummy.sh hsr.sh l2tp.sh \
-		iw.sh iwd.sh wireguard.sh veth.sh dhclientv6.sh
+		iw.sh iwd.sh wireguard.sh veth.sh dhclientv6.sh qmi.sh
 
 SRCS-NetBSD= ifwatchd.sh.in
 INC-NetBSD=	ifwatchd.sh
diff --git a/net/qmi.sh b/net/qmi.sh
new file mode 100644
index 0000000..ac1b2dd
--- /dev/null
+++ b/net/qmi.sh
@@ -0,0 +1,133 @@
+# Copyright (c) 2011 by Gentoo Foundation
+# Released under the 2-clause BSD license.
+# shellcheck shell=sh disable=SC1008
+
+_is_qmi() {
+	[ -d "/sys/class/net/${IFACE}/qmi" ]
+}
+
+_get_state() {
+	echo "/run/net.${IFACE}.qmi.state"
+}
+
+_get_device() {
+	echo "/dev/cdc-$(echo "${IFACE}" | sed 's/wwan/wdm/')"
+}
+
+qmi_depend()
+{
+	program qmicli
+	program ip
+	before interface
+}
+
+qmi_pre_start() {
+
+	_is_qmi || return 0
+
+	local device
+	local apn
+	local auth
+	local username
+	local password
+	local out
+	local rc
+
+	eval device=\$qmi_cdc_${IFVAR}
+	eval apn=\$qmi_apn_${IFVAR}
+	eval auth=\$qmi_auth_${IFVAR}
+	eval username=\$qmi_username_${IFVAR}
+	eval password=\$qmi_password_${IFVAR}
+
+	[ -n "${apn}" ] || return 0
+
+	[ -n "${device}" ] || device="$(_get_device)"
+	[ -n "${auth}" ] || auth="none"
+	[ -n "${username}" ] || username="dummy"
+	[ -n "${password}" ] || password="dummy"
+
+	if ! [ -c "${device}" ]; then
+		ewarn "Cannot open device ${device} for ${IFACE}, aborting configuration"
+		return 1
+	fi
+
+	if ! cat "/sys/class/net/${IFACE}/qmi/raw_ip" | grep -q Y; then
+		ebegin "Configuring QMI raw IP"
+
+		ip link set "${IFACE}" down
+		if ! echo Y > "/sys/class/net/${IFACE}/qmi/raw_ip"; then
+			eend 1 "Cannot set raw IP mode for ${IFACE}, aborting configuration"
+			return 1
+		else
+			eend 0
+		fi
+	fi
+
+	local wwan_connection="apn='${apn}',auth='${auth}',username='${username}',password='${password}',autoconnect=yes,ip-type=4"
+	local n
+	for n in 1 2 3; do
+		ebegin "Connecting QMI APN '${apn}' using '${username}'"
+
+		if out="$( \
+			qmicli \
+				--device="${device}" \
+				--wds-start-network="${wwan_connection}" \
+				--device-open-proxy \
+				--client-no-release-cid \
+		)"; then
+			eend 0
+			break
+		elif echo "${out}" | grep -qi "timed out"; then
+			eend 1 "QMI start network timeout"
+		else
+			eend 1 "QMI start network failed for ${IFACE}, aborting"
+			return 1
+		fi
+	done
+
+	local handle="$(echo "${out}" | grep "Packet data handle:" | sed "s/.*'\(.*\)'.*/\1/")"
+	local cid="$(echo "${out}" | grep "CID:" | sed "s/.*'\(.*\)'.*/\1/")"
+
+	if [ -z "${handle}" ]; then
+		ewarn 1 "No QMI connection handle ${IFACE}, aborting configuration"
+		return 1
+	fi
+
+	if [ -z "${cid}" ]; then
+		ewarn "No QMI connection id ${IFACE}, aborting configuration"
+		return 1
+	fi
+
+	cat > "$(_get_state)" << __EOF__
+device="${device}"
+handle="${handle}"
+cid="${cid}"
+__EOF__
+}
+
+qmi_post_stop() {
+
+	_is_qmi || return 0
+
+	local state="$(_get_state)"
+
+	[ -f "${state}" ] || return 0
+
+	ebegin "Disconnecting QMI ${IFACE}"
+
+	local device
+	local handle
+	local cid
+
+	. "${state}"
+
+	qmicli \
+		--device="${device}" \
+		--client-cid="${cid}" \
+		--wds-stop-network="${handle}"
+	rc="$?"
+
+	rm -f "${state}"
+
+	eend "${rc}"
+}