Convert OVS key attributes into readable text

ovs_key_m2n.py

#!/usr/bin/env python3                                                                                                                                                                                                                       
                                                                                
import sys                                                                      
from enum import Enum                                                           
                                                                                
class Key_attr(Enum):                                                           
    # From Linux include/uapi/linux/openvswitch.h                               
    OVS_KEY_ATTR_UNSPEC = 0                                                     
    OVS_KEY_ATTR_ENCAP = 1                                                      
    OVS_KEY_ATTR_PRIORITY = 2                                                   
    OVS_KEY_ATTR_IN_PORT = 3                                                    
    OVS_KEY_ATTR_ETHERNET = 4                                                   
    OVS_KEY_ATTR_VLAN = 5                                                       
    OVS_KEY_ATTR_ETHERTYPE = 6                                                  
    OVS_KEY_ATTR_IPV4 = 7                                                       
    OVS_KEY_ATTR_IPV6 = 8                                                       
    OVS_KEY_ATTR_TCP = 9                                                        
    OVS_KEY_ATTR_UDP = 10                                                       
    OVS_KEY_ATTR_ICMP = 11                                                      
    OVS_KEY_ATTR_ICMPV6 = 12                                                    
    OVS_KEY_ATTR_ARP = 13                                                       
    OVS_KEY_ATTR_ND = 14                                                        
    OVS_KEY_ATTR_SKB_MARK = 15                                                  
    OVS_KEY_ATTR_TUNNEL = 16                                                    
    OVS_KEY_ATTR_SCTP = 17                                                      
    OVS_KEY_ATTR_TCP_FLAGS = 18                                                 
    OVS_KEY_ATTR_DP_HASH = 19                                                   
    OVS_KEY_ATTR_RECIRC_ID = 20                                                 
    OVS_KEY_ATTR_MPLS = 21                                                      
    OVS_KEY_ATTR_CT_STATE = 22                                                  
    OVS_KEY_ATTR_CT_ZONE = 23                                                   
    OVS_KEY_ATTR_CT_MARK = 24                                                   
    OVS_KEY_ATTR_CT_LABELS = 25                                                 
                                                                                
                                                                                
def print_keys(value):                                                          
    for name, member in Key_attr.__members__.items():                           
        if value & (1 << member.value):                                         
            print("\t%s, " % name)                                              
    print()                                                                     
                                                                                
                                                                                
def main():                                                                     
    if len(sys.argv) < 2:                                                       
        sys.exit('Usage: %s <mask> [allowed]' % sys.argv[0])                    
                                                                                
    v1 = int(sys.argv[1], 16)                                                   
    v2 = 0                                                                      
    if len(sys.argv) > 2:                                                       
        v2 = int(sys.argv[2], 16)                                               
                                                                                
    print("Initial mask:")                                                      
    print_keys(v1)                                                              
                                                                                
    if v2:                                                                      
        print("Allowed mask:")                                                  
        print_keys(v2)                                                          
                                                                                
        print("mask & ~allowed:")                                               
        print_keys(v1 & ~v2)                                                    

        print("allowed & ~mask:")                                               
        print_keys(v2 & ~v1)
          
                                                                                
if __name__ == "__main__":                                                      
    main()