From: Yu Watanabe <watanabe.yu+github@gmail.com>
Date: Tue, 11 Jun 2019 23:26:11 +0900
Subject: network: ignore requested ipv6 route when ipv6 is disabled by sysctl

(cherry picked from commit c442331750a2a9711036080f7590e190b9b0eb54)
---
 src/network/networkd-link.c  |  4 ++--
 src/network/networkd-ndisc.c | 12 ++++++------
 src/network/networkd-route.c |  7 ++++++-
 3 files changed, 14 insertions(+), 9 deletions(-)

diff --git a/src/network/networkd-link.c b/src/network/networkd-link.c
index 638aae0..5a181c2 100644
--- a/src/network/networkd-link.c
+++ b/src/network/networkd-link.c
@@ -840,8 +840,8 @@ static int link_request_set_routes(Link *link) {
                                 link_enter_failed(link);
                                 return r;
                         }
-
-                        link->route_messages++;
+                        if (r > 0)
+                                link->route_messages++;
                 }
 
         if (link->route_messages == 0) {
diff --git a/src/network/networkd-ndisc.c b/src/network/networkd-ndisc.c
index 78c98a0..36fbe29 100644
--- a/src/network/networkd-ndisc.c
+++ b/src/network/networkd-ndisc.c
@@ -117,8 +117,8 @@ static int ndisc_router_process_default(Link *link, sd_ndisc_router *rt) {
                 link_enter_failed(link);
                 return r;
         }
-
-        link->ndisc_messages++;
+        if (r > 0)
+                link->ndisc_messages++;
 
         return 0;
 }
@@ -255,8 +255,8 @@ static int ndisc_router_process_onlink_prefix(Link *link, sd_ndisc_router *rt) {
                 link_enter_failed(link);
                 return r;
         }
-
-        link->ndisc_messages++;
+        if (r > 0)
+                link->ndisc_messages++;
 
         return 0;
 }
@@ -316,8 +316,8 @@ static int ndisc_router_process_route(Link *link, sd_ndisc_router *rt) {
                 link_enter_failed(link);
                 return r;
         }
-
-        link->ndisc_messages++;
+        if (r > 0)
+                link->ndisc_messages++;
 
         return 0;
 }
diff --git a/src/network/networkd-route.c b/src/network/networkd-route.c
index 5553a7e..5b7e019 100644
--- a/src/network/networkd-route.c
+++ b/src/network/networkd-route.c
@@ -509,6 +509,11 @@ int route_configure(
         assert(IN_SET(route->family, AF_INET, AF_INET6));
         assert(callback);
 
+        if (route->family == AF_INET6 && manager_sysctl_ipv6_enabled(link->manager) == 0) {
+                log_link_warning(link, "An IPv6 route is requested, but IPv6 is disabled by sysctl, ignoring.");
+                return 0;
+        }
+
         if (route_get(link, route->family, &route->dst, route->dst_prefixlen, route->tos, route->priority, route->table, NULL) <= 0 &&
             set_size(link->routes) >= routes_max())
                 return -E2BIG;
@@ -675,7 +680,7 @@ int route_configure(
         sd_event_source_unref(route->expire);
         route->expire = TAKE_PTR(expire);
 
-        return 0;
+        return 1;
 }
 
 int config_parse_gateway(