tests: Implement send_garp using scapy.

send_garp was implemented multiple time in ovn.at. Move a unique
implementation to ovn-macros.

Some tests were using ARP requests (opcode=1), and others use ARP
reply (opcode=2).
This patch does not change that behavior.

Signed-off-by: Xavier Simonart <[email protected]>
Signed-off-by: 0-day Robot <[email protected]>

tests/ovn-macros.at

@@ -1176,6 +1176,22 @@ store_ip6_multicast_pkt() {
     echo ${packet} >> ${outfile}
 }
 
+hex_to_mac() {
+    mac_hex=$1
+    echo $mac_hex | sed 's/../&:/g;s/:$//'
+}
+
+send_garp() {
+    local hv=$1 inport=$2 op=$3 eth_src=$4 eth_dst=$5 spa=$6 tpa=$7
+
+    local packet=$(fmt_pkt "Ether(dst='${eth_dst}', src='${eth_src}')/ \
+                      ARP(op=$op, hwsrc='${eth_src}', hwdst='${eth_src}', \
+                      psrc='${spa}', pdst='${tpa}')")
+    echo "Sending GARP($op) $eth_src $eth_dst $spa $tpa packet=$packet on $hv"
+    as $hv
+    ovs-appctl netdev-dummy/receive $inport $packet
+}
+
 # Wrapper on top of ovn-trace, stripping some things and storing the trace
 # output to a file called 'trace'.  For now it strips the rows starting
 # with a '#'.  This should correspond to the flow key and might be displayed