def set_field_val(hsf, wc_obj, field, val, process_field=True):
""" Set a specific field in a wildcard using pyretic fields. """
def ip2int(ip):
assert isinstance(ip, IPv4Network)
numeric_ip = 0
for p in str(ip.ip).split('.'):
numeric_ip = (numeric_ip << 8) + int(p)
return numeric_ip
def mac2int(mac):
assert isinstance(mac, str)
numeric_mac = 0
for p in mac.split(':'):
numeric_mac = (numeric_mac << 8) + int(p, 16)
return numeric_mac
if field in ['srcmac', 'dstmac']:
int_val = mac2int(val) if process_field else val
set_header_field(hsf, wc_obj, field, int_val, 0)
elif field in ['srcip', 'dstip']:
int_val = ip2int(val) if process_field else val
right_pfx = (32 - val.prefixlen) if process_field else 0
set_header_field(hsf, wc_obj, field, int_val, right_pfx)
elif field in ['vlan_offset', 'vlan_nbits', 'vlan_total_stages']:
''' ignore tagging helper fields. For now, we ensure that these fields
are irrelevant by sending in a single-stage policy. '''
pass
elif not field in ['switch', 'port']:
assert "%s_pos" % field in hsf
assert "%s_len" % field in hsf
set_header_field(hsf, wc_obj, field, val, 0)
else:
''' do nothing '''
pass
return wc_obj
def set_field_val(hsf, wc_obj, field, val, process_field=True):
""" Set a specific field in a wildcard using pyretic fields. """
def ip2int(ip):
assert isinstance(ip, IPv4Network)
numeric_ip = 0
for p in str(ip.ip).split('.'):
numeric_ip = (numeric_ip << 8) + int(p)
return numeric_ip
def mac2int(mac):
assert isinstance(mac, str)
numeric_mac = 0
for p in mac.split(':'):
numeric_mac = (numeric_mac << 8) + int(p, 16)
return numeric_mac
if field in ['srcmac', 'dstmac']:
int_val = mac2int(val) if process_field else val
set_header_field(hsf, wc_obj, field, int_val, 0)
elif field in ['srcip', 'dstip']:
int_val = ip2int(val) if process_field else val
right_pfx = (32 - val.prefixlen) if process_field else 0
set_header_field(hsf, wc_obj, field, int_val, right_pfx)
elif not field in ['switch', 'port']:
set_header_field(hsf, wc_obj, field, val, 0)
else:
''' do nothing '''
pass
return wc_obj
