diff options
Diffstat (limited to 'cloudinit/net/network_state.py')
| -rw-r--r-- | cloudinit/net/network_state.py | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/cloudinit/net/network_state.py b/cloudinit/net/network_state.py index 31738c73..fe667d88 100644 --- a/cloudinit/net/network_state.py +++ b/cloudinit/net/network_state.py @@ -961,4 +961,16 @@ def mask_to_net_prefix(mask): return ipv4_mask_to_net_prefix(mask) +def mask_and_ipv4_to_bcast_addr(mask, ip): + """Calculate the broadcast address from the subnet mask and ip addr. + + Supports ipv4 only.""" + ip_bin = int(''.join([bin(int(x) + 256)[3:] for x in ip.split('.')]), 2) + mask_dec = ipv4_mask_to_net_prefix(mask) + bcast_bin = ip_bin | (2**(32 - mask_dec) - 1) + bcast_str = '.'.join([str(bcast_bin >> (i << 3) & 0xFF) + for i in range(4)[::-1]]) + return bcast_str + + # vi: ts=4 expandtab |