[4105] Implement 4o6-interface-id parameter.

src/bin/dhcp4/json_config_parser.cc

@@ -204,6 +204,8 @@ protected:
             parser = new StringParser(config_id, string_values_);
         } else if (config_id.compare("4o6-interface") == 0) {
             parser = new StringParser(config_id, string_values_);
+        } else if (config_id.compare("4o6-interface-id") == 0) {
+            parser = new StringParser(config_id, string_values_);
         } else {
             isc_throw(NotImplemented, "unsupported parameter: " << config_id);
         }
@@ -342,6 +344,17 @@ protected:
             // Don't care. 4o6-subnet is optional.
         }
 
+        // Try 4o6 specific paramter: 4o6-interface-id
+        try {
+            std::string ifaceid = string_values_->getParam("4o6-interface-id");
+            OptionBuffer tmp(ifaceid.begin(), ifaceid.end());
+            OptionPtr opt(new Option(Option::V6, D6O_INTERFACE_ID, tmp));
+            subnet4->get4o6().interface_id_ = opt;
+            subnet4->get4o6().enabled_ = true;
+        } catch (const DhcpConfigError&) {
+
+        }
+
         // Try setting up client class (if specified)
         try {
             string client_class = string_values_->getParam("client-class");

src/bin/dhcp4/tests/config_parser_unittest.cc

@@ -3909,11 +3909,12 @@ TEST_F(Dhcp4ParserTest, 4o6subnetIface) {
     checkResult(status, 0);
 
     // Now check if the configuration was indeed handled and we have
-    // expected pool configured.
+    // expected subnet configured...
     Subnet4Ptr subnet = CfgMgr::instance().getStagingCfg()->
         getCfgSubnets4()->selectSubnet(IOAddress("192.0.2.200"));
     ASSERT_TRUE(subnet);
 
+    // ... and that subnet has 4o6 network interface specified.
     Cfg4o6& dhcp4o6 = subnet->get4o6();
     EXPECT_TRUE(dhcp4o6.enabled_);
     EXPECT_EQ(IOAddress("2001:db8::543"), dhcp4o6.subnet4o6_.first);
@@ -3921,4 +3922,48 @@ TEST_F(Dhcp4ParserTest, 4o6subnetIface) {
     EXPECT_EQ("ethX", dhcp4o6.iface4o6_);
 }
 
+// Checks if the DHCPv4 is able to parse the configuration with 4o6 network
+// interface-id.
+TEST_F(Dhcp4ParserTest, 4o6subnetInterfaceId) {
+
+    ConstElementPtr status;
+
+    // Just a plain v4 config (no 4o6 parameters)
+    string config = "{ " + genIfaceConfig() + "," +
+        "\"rebind-timer\": 2000, "
+        "\"renew-timer\": 1000, "
+        "\"subnet4\": [ { "
+        "    \"pools\": [ { \"pool\": \"192.0.2.1 - 192.0.2.100\" } ],"
+        "    \"subnet\": \"192.0.2.0/24\","
+        "    \"4o6-interface-id\": \"vlan123\" } ],"
+        "\"valid-lifetime\": 4000 }";
+
+    ElementPtr json = Element::fromJSON(config);
+
+    EXPECT_NO_THROW(status = configureDhcp4Server(*srv_, json));
+
+    // check if returned status is OK
+    checkResult(status, 0);
+
+    // Now check if the configuration was indeed handled and we have
+    // expected 4o6-interface-id configured.
+    Subnet4Ptr subnet = CfgMgr::instance().getStagingCfg()->
+        getCfgSubnets4()->selectSubnet(IOAddress("192.0.2.200"));
+    ASSERT_TRUE(subnet);
+
+    Cfg4o6& dhcp4o6 = subnet->get4o6();
+    EXPECT_TRUE(dhcp4o6.enabled_);
+    OptionPtr ifaceid = dhcp4o6.interface_id_;
+    ASSERT_TRUE(ifaceid);
+
+    vector<uint8_t> data = ifaceid->getData();
+    const char *exp_data = "vlan123";
+    // Let's convert vlan123 to vector<uint8_t> format.
+    // We need to skip the last \0 byte, thuse sizeof() - 1.
+    vector<uint8_t> exp(exp_data, exp_data + sizeof(exp_data) - 1);
+
+    EXPECT_TRUE(exp == data);
+}
+
+
 }

src/lib/dhcpsrv/subnet.h

@@ -523,11 +523,14 @@ struct Cfg4o6 {
     /// Specifies if 4o6 is enabled on this subnet.
     bool enabled_;
 
-    /// Specifies the network interface used as subnet selector
+    /// Specifies the network interface used as v4 subnet selector.
     std::string iface4o6_;
 
-    /// Specifies the IPv6 subnet used for subnet selection
+    /// Specifies the IPv6 subnet used for v4 subnet selection.
     std::pair<asiolink::IOAddress, uint8_t> subnet4o6_;
+
+    /// Specifies the v6 interface-id used for v4 subnet selection.
+    OptionPtr interface_id_;
 };
 
 /// @brief A configuration holder for IPv4 subnet.