Forward ISUPPORT NETWORK token

downstream.go

@@ -879,6 +879,10 @@ func (dc *downstreamConn) welcome() error {
 		fmt.Sprintf("CHATHISTORY=%v", dc.srv.HistoryLimit),
 	}
 
+	if uc := dc.upstream(); uc != nil && uc.networkName != "" {
+		isupport = append(isupport, fmt.Sprintf("NETWORK=%v", uc.networkName))
+	}
+
 	dc.SendMessage(&irc.Message{
 		Prefix:  dc.srv.prefix(),
 		Command: irc.RPL_WELCOME,

upstream.go

@@ -78,6 +78,7 @@ type upstreamConn struct {
 	user    *user
 
 	serverName            string
+	networkName           string
 	availableUserModes    string
 	availableChannelModes map[byte]channelModeType
 	availableChannelTypes string
@@ -670,6 +671,8 @@ func (uc *upstreamConn) handleMessage(msg *irc.Message) error {
 						}
 						uc.availableMemberships = memberships
 					}
+				case "NETWORK":
+					uc.networkName = value
 				}
 			} else {
 				// TODO: handle ISUPPORT negations