F_SOURCE_ROUTE
if ((pongflags & F_SOURCE_ROUTE) != 0)
if ((pingflags & F_SOURCE_ROUTE) == 0)
pongflags |= F_SOURCE_ROUTE;
pingflags |= F_SOURCE_ROUTE;
if (!(pingflags & F_SOURCE_ROUTE))
if (pingflags & F_SOURCE_ROUTE) {