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route: check if nh exists while updating route #290

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route: check if nh exists while updating route #290

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9 changes: 9 additions & 0 deletions lib/route/route_obj.c
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Original file line number Diff line number Diff line change
Expand Up @@ -500,7 +500,16 @@ static int route_update(struct nl_object *old_obj, struct nl_object *new_obj)
switch(action) {
case RTM_NEWROUTE : {
struct rtnl_nexthop *cloned_nh;
struct rtnl_nexthop *old_nh;

/*
* Do not add the nexthop to old route if it was already added before
*/
nl_list_for_each_entry(old_nh, &old_route->rt_nexthops, rtnh_list) {
if (!rtnl_route_nh_compare(old_nh, new_nh, ~0, 0)) {
return -NLE_OPNOTSUPP;
}
}
/*
* Add the nexthop to old route
*/
Expand Down