Added logic to read IPv6 addresses

src/actions/gobgp_action.cpp

@@ -128,6 +128,8 @@ bool gobgp_announce_host_ipv6 = false;
 bgp_community_attribute_element_t bgp_community_host_ipv6;
 bgp_community_attribute_element_t bgp_community_subnet_ipv6;;
 
+subnet_ipv6_cidr_mask_t ipv6_next_hop;
+
 void gobgp_action_init() {
     logger << log4cpp::Priority::INFO << "GoBGP action module loaded";
     gobgp_client =
@@ -137,6 +139,21 @@ void gobgp_action_init() {
         gobgp_nexthop = configuration_map["gobgp_next_hop"];
     }
 
+    // Set IPv6 hop to safe default
+    ipv6_next_hop.cidr_prefix_length = 128;
+    read_ipv6_host_from_string("100::1", ipv6_next_hop.subnet_address);
+
+    if (configuration_map.count("gobgp_next_hop_ipv6")) {
+        bool parsed_next_hop_result =
+            read_ipv6_host_from_string(configuration_map["gobgp_next_hop_ipv6"], ipv6_next_hop.subnet_address);
+
+        if (!parsed_next_hop_result) {
+            logger << log4cpp::Priority::ERROR << "Can't parse specified IPv6 next hop to IPv6 address: " << configuration_map["gobgp_next_hop_ipv6"];
+        }
+    }
+
+    logger << log4cpp::Priority::INFO << "IPv6 next hop: " << print_ipv6_cidr_subnet(ipv6_next_hop);
+
     if (configuration_map.count("gobgp_announce_host")) {
         gobgp_announce_host = configuration_map["gobgp_announce_host"] == "on";
     }

src/fast_library.cpp

@@ -1462,3 +1462,12 @@ bool convert_string_to_positive_integer_safe(std::string line, int& value) {
     return true;
 }
 
+// Read IPv6 host address from string representation
+bool read_ipv6_host_from_string(std::string ipv6_host_as_string, in6_addr& result) {
+    if (inet_pton(AF_INET6, ipv6_host_as_string.c_str(), &result) == 1) {
+        return true;
+    } else {
+        return false;
+    }
+}
+

src/fast_library.h

@@ -121,3 +121,4 @@ bool set_boost_process_name(boost::thread* thread, std::string process_name);
  std::string print_ipv6_cidr_subnet(subnet_ipv6_cidr_mask_t subnet);
  std::string convert_any_ip_to_string(subnet_ipv6_cidr_mask_t subnet);
 bool convert_string_to_positive_integer_safe(std::string line, int& value);
+bool read_ipv6_host_from_string(std::string ipv6_host_as_string, in6_addr& result);