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lib/packet/arp.py: add convenience function to create arp for ip

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Since ip case is most often used, introduce a convenience
function for that.

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
This commit is contained in:
Isaku Yamahata 2013-04-13 23:47:35 +09:00 committed by FUJITA Tomonori
parent 3f3b683d20
commit e20fcad468
1 changed files with 9 additions and 0 deletions
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9
ryu/lib/packet/arp.py
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@ -14,6 +14,8 @@
# limitations under the License.
import struct
from ryu.ofproto import ether
from . import packet_base
ARP_HW_TYPE_ETHERNET = 1 # ethernet hardware type
@ -55,3 +57,10 @@ class arp(packet_base.PacketBase):
self.hlen, self.plen, self.opcode,
self.src_mac, self.src_ip, self.dst_mac,
self.dst_ip)
def arp_ip(opcode, src_mac, src_ip, dst_mac, dst_ip):
return arp(ARP_HW_TYPE_ETHERNET, ether.ETH_TYPE_IP,
6, # ether mac address length
4, # ipv4 address length,
opcode, src_mac, src_ip, dst_mac, dst_ip)