uqmi: support split-APN IPv4 and IPv6 dual-stack

Add two new "v6apn" and "v6profile" properties, to support split-APN
dual-stack onfiguration. This extends the existing ipv4v6 PDP type,
allowing simultaneous connection to two distinct APNs,
one for IPv4 and one for IPv6.
The parameters override existing 'apn' and 'profile' respectively,
if set, but only for IPv6 part of the connection.
If unset, they default to their original values, constituting a standard
IPv4v6 setup.

If a different APN is set for IPv6, a corresponding profile MUST also be
configured, with a different ID, than the IPv4 profile, for example,
profile 2.
Both APNs must match ones configured through QMI or through 'AT+CGDCONT'
command.

Example configuration in UCI:

config interface 'wan'
        option proto 'qmi'
        option device '/dev/cdc-wdm0'
        option autoconnect '1'
        option pdptype 'ipv4v6'
        option apn 'internet'
        option v6apn 'internetipv6'
	option profile '1'
	option v6profile '2'

Corresponding profile configuration:
AT+CGDCONT?
+CGDCONT: 1,"IP","internet","0.0.0.0",0,0,0,0
+CGDCONT: 2,"IPV6","internetipv6","0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0",0,0,0,0

Signed-off-by: Lech Perczak <[email protected]>

package/network/utils/uqmi/files/lib/netifd/proto/qmi.sh

@@ -11,6 +11,7 @@ proto_qmi_init_config() {
 	no_device=1
 	proto_config_add_string "device:device"
 	proto_config_add_string apn
+	proto_config_add_string v6apn
 	proto_config_add_string auth
 	proto_config_add_string username
 	proto_config_add_string password
@@ -19,6 +20,7 @@ proto_qmi_init_config() {
 	proto_config_add_string modes
 	proto_config_add_string pdptype
 	proto_config_add_int profile
+	proto_config_add_int v6profile
 	proto_config_add_boolean dhcp
 	proto_config_add_boolean dhcpv6
 	proto_config_add_boolean autoconnect
@@ -31,14 +33,14 @@ proto_qmi_init_config() {
 proto_qmi_setup() {
 	local interface="$1"
 	local dataformat connstat plmn_mode mcc mnc
-	local device apn auth username password pincode delay modes pdptype
-	local profile dhcp dhcpv6 autoconnect plmn timeout mtu $PROTO_DEFAULT_OPTIONS
+	local device apn v6apn auth username password pincode delay modes pdptype
+	local profile v6profile dhcp dhcpv6 autoconnect plmn timeout mtu $PROTO_DEFAULT_OPTIONS
 	local ip4table ip6table
 	local cid_4 pdh_4 cid_6 pdh_6
 	local ip_6 ip_prefix_length gateway_6 dns1_6 dns2_6
 
-	json_get_vars device apn auth username password pincode delay modes
-	json_get_vars pdptype profile dhcp dhcpv6 autoconnect plmn ip4table
+	json_get_vars device apn v6apn auth username password pincode delay modes
+	json_get_vars pdptype profile v6profile dhcp dhcpv6 autoconnect plmn ip4table
 	json_get_vars ip6table timeout mtu $PROTO_DEFAULT_OPTIONS
 
 	[ "$timeout" = "" ] && timeout="10"
@@ -309,10 +311,13 @@ proto_qmi_setup() {
 
 		uqmi -s -d "$device" --set-client-id wds,"$cid_6" --set-ip-family ipv6 > /dev/null 2>&1
 
+		: "${v6apn:=${apn}}"
+		: "${v6profile:=${profile}}"
+
 		pdh_6=$(uqmi -s -d "$device" --set-client-id wds,"$cid_6" \
 			--start-network \
-			${apn:+--apn $apn} \
-			${profile:+--profile $profile} \
+			${v6apn:+--apn $v6apn} \
+			${v6profile:+--profile $v6profile} \
 			${auth:+--auth-type $auth} \
 			${username:+--username $username} \
 			${password:+--password $password} \