[source] ppp: honor ip6table for IPv6 PPP interfaces

[LEDE Commits]

jow pushed a commit to source.git, branch lede-17.01:
https://git.lede-project.org/3983b4ad0fb6e9f6a62a89711cc87bd2bc06f35b

commit 3983b4ad0fb6e9f6a62a89711cc87bd2bc06f35b
Author: Ulrich Weber <ulrich.weber at riverbed.com>
AuthorDate: Fri Feb 10 14:28:09 2017 +0100

    ppp: honor ip6table for IPv6 PPP interfaces
    
    as we do for IPv4 PPP interfaces. When we create the
    dynamic IPv6 interface we should inherit ip6table from
    main interface.
    
    Signed-off-by: Ulrich Weber <ulrich.weber at riverbed.com>
---
 package/network/services/ppp/files/lib/netifd/ppp6-up | 1 +
 package/network/services/ppp/files/ppp.sh             | 3 ++-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/package/network/services/ppp/files/lib/netifd/ppp6-up b/package/network/services/ppp/files/lib/netifd/ppp6-up
index 87ca63c..07b6a43 100755
--- a/package/network/services/ppp/files/lib/netifd/ppp6-up
+++ b/package/network/services/ppp/files/lib/netifd/ppp6-up
@@ -22,6 +22,7 @@ if [ -n "$AUTOIPV6" ]; then
 	json_add_string ifname "@$PPP_IPPARAM"
 	json_add_string proto "dhcpv6"
 	[ -n "$EXTENDPREFIX" ] && json_add_string extendprefix 1
+	[ -n "$IP6TABLE" ] && json_add_string ip6table $IP6TABLE
 	json_close_object
 	ubus call network add_dynamic "$(json_dump)"
 fi
diff --git a/package/network/services/ppp/files/ppp.sh b/package/network/services/ppp/files/ppp.sh
index 91452b4..9c27b3c 100755
--- a/package/network/services/ppp/files/ppp.sh
+++ b/package/network/services/ppp/files/ppp.sh
@@ -88,7 +88,7 @@ ppp_generic_setup() {
 	local config="$1"; shift
 	local localip
 
-	json_get_vars ipv6 demand keepalive keepalive_adaptive username password pppd_options pppname unnumbered persist maxfail holdoff
+	json_get_vars ipv6 ip6table demand keepalive keepalive_adaptive username password pppd_options pppname unnumbered persist maxfail holdoff
 	if [ "$ipv6" = 0 ]; then
 		ipv6=""
 	elif [ -z "$ipv6" -o "$ipv6" = auto ]; then
@@ -136,6 +136,7 @@ ppp_generic_setup() {
 		${lcp_failure:+lcp-echo-interval $lcp_interval lcp-echo-failure $lcp_failure $lcp_adaptive} \
 		${ipv6:++ipv6} \
 		${autoipv6:+set AUTOIPV6=1} \
+		${ip6table:+set IP6TABLE=$ip6table} \
 		nodefaultroute \
 		usepeerdns \
 		$demand $persist maxfail $maxfail \