[FS#283] NAT Loopback ("reflections") not working correctly.

[LEDE Bugs]

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FS#283 - NAT Loopback ("reflections") not working correctly.
User who did this - schoerg (schoerg)

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Thank you, I tried it somewhat:

#!/bin/sh

mask="0"

[ -n "$INCLUDE_ONLY" ] || {
	. /lib/functions.sh
	. ../netifd-proto.sh
	init_proto "$@"
}
#DBG=-v

proto_mbim_init_config() {
	available=1
	no_device=1
	proto_config_add_string "device:device"
	proto_config_add_string apn
	proto_config_add_string pincode
	proto_config_add_string delay
	proto_config_add_string auth
	proto_config_add_string username
	proto_config_add_string password
}

# https://stackoverflow.com/questions/20762575
cdr2mask ()
{
   # Number of args to shift, 255..255, first non-255 byte, zeroes
   set -- $(( 5 - ($1 / 8) )) 255 255 255 255 $(( (255  /tmp/ip
	IP=$(cat /tmp/ip |grep ipv4address |grep -E -o "(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)")
	NM=$(cat /tmp/ip |grep ipv4address |grep -o '.\{2\}$')
	GW=$(cat /tmp/ip |grep ipv4gateway |grep -E -o "(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)")
	DNS=$(cat /tmp/ip |grep ipv4dnsserver |grep -E -o "(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)" |head -1)
	
	cdr2mask $NM
	
	echo "IP: $IP $mask"
	echo "GW: $GW"
	echo "DNS: $DNS"

	uci_set_state network $interface tid "$tid"
	echo "mbim[$$]" "Connected, setting IP"
	proto_init_update "$ifname" 1
	proto_send_update "$interface"

	json_init
	json_add_string name "${interface}_4"
	json_add_string ifname "@$interface"
	json_add_string proto "static"
	
	ifconfig wwan0 $IP netmask $mask
	ip route add default dev wwan0

    proto_add_ipv4_address $IP $mask
    proto_add_ipv4_route 0.0.0.0 0 $GW
    proto_send_update wan


	echo "nameserver $DNS" >> /tmp/resolv.conf.auto
	echo "nameserver $DNS" >> /etc/resolv.conf
	

	#proto_init_update wwan0
	#proto_add_ipv4_address $IP $mask
	#proto_add_ipv4_route 0.0.0.0 0 $GW
	#proto_send_update wan
	
	return 0
}

proto_mbim_setup() {
	local ret

	_proto_mbim_setup $@
	ret=$?

	[ "$ret" = 0 ] || {
		logger "mbim bringup failed, retry in 15s"
		sleep 15
	}

	return $rt
}

proto_mbim_teardown() {
	local interface="$1"

	local device
	json_get_vars device
	local tid=$(uci_get_state network $interface tid)

	[ -n "$ctl_device" ] && device=$ctl_device

	echo "mbim[$$]" "Stopping network"
	[ -n "$tid" ] && {
		umbim $DBG -t$tid -d "$device" disconnect
		uci_revert_state network $interface tid
	}

	proto_init_update "*" 0
	proto_send_update "$interface"
}

[ -n "$INCLUDE_ONLY" ] || add_protocol mbim



The changes are very sloppy, but work. Not sure on where to add the proto_ stuff.
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=283#comment980