openfortivpn: fix routes passed to netifd

The openfortivpn routes are a bit different than the standard ppp
routes so we need to handle them with a custom ppp-up script.

Gateway should not be set, and src should be set to the PPP local ip
address.

Signed-off-by: Aaron Goodman <aaronjg@stanford.edu>

net/openfortivpn/files/openfortivpn-ppp-up

@@ -0,0 +1,20 @@
+#!/bin/sh
+PPP_IPPARAM="$6"
+
+. /lib/netifd/netifd-proto.sh
+proto_init_update "$IFNAME" 1 1
+proto_set_keep 1
+[ -n "$PPP_IPPARAM" ] && {
+	[ -n "$IPLOCAL" ] && proto_add_ipv4_address "$IPLOCAL" 32 "" "$IPREMOTE"
+	[ -n "$IPREMOTE" ] && proto_add_ipv4_route 0.0.0.0 0 "" "$IPLOCAL"
+	[ -n "$DNS1" ] && proto_add_dns_server "$DNS1"
+	[ -n "$DNS2" -a "$DNS1" != "$DNS2" ] && proto_add_dns_server "$DNS2"
+}
+proto_send_update "$PPP_IPPARAM"
+
+[ -d /etc/ppp/ip-up.d ] && {
+	for SCRIPT in /etc/ppp/ip-up.d/*
+	do
+		[ -x "$SCRIPT" ] && "$SCRIPT" "$@"
+	done
+}

net/openfortivpn/files/openfortivpn.sh

@@ -125,7 +125,7 @@ receive-all
 nodetach
 ipparam $config
 lcp-max-configure 40
-ip-up-script /lib/netifd/ppp-up
+ip-up-script /lib/netifd/openfortivpn-ppp-up
 ip-down-script /lib/netifd/ppp-down
 mru 1354"  > $callfile
         append_args "--pppd-call=openfortivpn/$config"