-- binary
01 0e # version, type
00 70 # length
12 34 56 78 # xid

#### ofp_flow_mod
00 30 00 e2 # wild cards=(OFPFW_DL_VLAN|OFPFW_NW_PROTO|OFPFW_TP_SRC|OFPFW_TP_DST|OFPFW_DL_VLAN_PCP|OFPFW_NW_TOS)
00 03 # in_port
01 23 45 67 89 ab # eth_src
cd ef 01 23 45 67 # eth_dst
00 00 # dl_vlan
00 00 # dl_pcp, pad
08 00 # dl_type
00 00 00 00 # nw_tos, nw_proto, pad[2]
c0 a8 03 7f # nw_src
ff ff ff ff # nw_dst
00 00 00 00 # tcp_src, tcp_dst

00 00 00 00 00 00 00 00 # cookie
00 00 # command
00 05 # idle_timeout
00 00 # hard_timeout
00 00 # priority
00 00 00 00 # buffer_id
00 00 #out_port
00 02 # flags (CHECK_OVERLAP)

#list(ofp_action)
00 00 00 08 # type=OUTPUT, len=8
ff fb # port=FLOOD
00 00 # maxLen=0
ff ff 00 10 # type=VENDOR, len=16
00 00 23 20 # vendor = Nicira
00 12 # subtype=dec_ttl
00 00 00 00 00 00 # pad(6)
ff ff 00 10 # type=VENDOR, len=16
00 5c 16 c7 # vendor = BSN
00 00 00 02 # subype = set_tunnel_dst
00 00 00 00 # tunnel dst ip
-- python
ofp.message.flow_add(
    xid=0x12345678,
    match=ofp.match(
        wildcards=ofp.OFPFW_DL_VLAN|ofp.OFPFW_NW_PROTO|ofp.OFPFW_TP_SRC|ofp.OFPFW_TP_DST|ofp.OFPFW_DL_VLAN_PCP|ofp.OFPFW_NW_TOS,
        in_port=3,
        eth_type=0x800,
        ipv4_src=0xc0a8037f,
        ipv4_dst=0xffffffff,
        eth_src=[0x01, 0x23, 0x45, 0x67, 0x89, 0xab],
        eth_dst=[0xcd, 0xef, 0x01, 0x23, 0x45, 0x67]),
    idle_timeout=5,
    flags=ofp.OFPFF_CHECK_OVERLAP,
    actions=[
        ofp.action.output(port=ofp.OFPP_FLOOD),
        ofp.action.nicira_dec_ttl(),
        ofp.action.bsn_set_tunnel_dst()])
-- python pretty-printer
flow_add {
  xid = 0x12345678,
  match = match_v1 {
    wildcards = OFPFW_DL_VLAN|OFPFW_NW_PROTO|OFPFW_TP_SRC|OFPFW_TP_DST|OFPFW_DL_VLAN_PCP|OFPFW_NW_TOS,
    in_port = 3,
    eth_src = 01:23:45:67:89:ab,
    eth_dst = cd:ef:01:23:45:67,
    vlan_vid = 0x0,
    vlan_pcp = 0x0,
    eth_type = 0x800,
    ip_dscp = 0x0,
    ip_proto = 0x0,
    ipv4_src = 192.168.3.127,
    ipv4_dst = 255.255.255.255,
    tcp_src = 0x0,
    tcp_dst = 0x0
  },
  cookie = 0x0,
  idle_timeout = 0x5,
  hard_timeout = 0x0,
  priority = 0x0,
  buffer_id = 0x0,
  out_port = 0,
  flags = 0x2,
  actions = [
    output { port = OFPP_FLOOD, max_len = 0x0 },
    nicira_dec_ttl {  },
    bsn_set_tunnel_dst { dst = 0x0 }
  ]
}
-- c
obj = of_flow_add_new(OF_VERSION_1_0);
of_flow_add_xid_set(obj, 0x12345678);
of_flow_add_idle_timeout_set(obj, 5);
of_flow_add_flags_set(obj, 2);
{
    of_match_t match = { OF_VERSION_1_0 };
    match.fields.in_port = 3;
    match.fields.eth_src = (of_mac_addr_t) { { 0x01, 0x23, 0x45, 0x67, 0x89, 0xab } };
    match.fields.eth_dst = (of_mac_addr_t) { { 0xcd, 0xef, 0x01, 0x23, 0x45, 0x67 } };
    match.fields.eth_type = 0x800;
    match.fields.ipv4_src = 0xc0a8037f;
    match.fields.ipv4_dst = 0xffffffff;
    OF_MATCH_MASK_IN_PORT_EXACT_SET(&match);
    OF_MATCH_MASK_ETH_SRC_EXACT_SET(&match);
    OF_MATCH_MASK_ETH_DST_EXACT_SET(&match);
    OF_MATCH_MASK_ETH_TYPE_EXACT_SET(&match);
    //OF_MATCH_MASK_VLAN_VID_EXACT_SET(&match);
    //OF_MATCH_MASK_VLAN_PCP_EXACT_SET(&match);
    OF_MATCH_MASK_ETH_TYPE_EXACT_SET(&match);
    //OF_MATCH_MASK_IP_DSCP_EXACT_SET(&match);
    //OF_MATCH_MASK_IP_PROTO_EXACT_SET(&match);
    OF_MATCH_MASK_IPV4_SRC_EXACT_SET(&match);
    OF_MATCH_MASK_IPV4_DST_EXACT_SET(&match);
    //OF_MATCH_MASK_TCP_SRC_EXACT_SET(&match);
    //OF_MATCH_MASK_TCP_DST_EXACT_SET(&match);
    of_flow_add_match_set(obj, &match);
}
{
    of_list_action_t actions;
    of_flow_add_actions_bind(obj, &actions);
    {
        of_object_t action;
        of_action_output_init(&action, OF_VERSION_1_0, -1, 1);
        of_list_action_append_bind(&actions, &action);
        of_action_output_port_set(&action, OF_PORT_DEST_FLOOD);
    }
    {
        of_object_t action;
        of_action_nicira_dec_ttl_init(&action, OF_VERSION_1_0, -1, 1);
        of_list_action_append_bind(&actions, &action);
    }
    {
        of_object_t action;
        of_action_bsn_set_tunnel_dst_init(&action, OF_VERSION_1_0, -1, 1);
        of_list_action_append_bind(&actions, &action);
    }
}
-- java
builder.setXid(0x12345678)
    .setMatch(
        factory.buildMatch()
            .setExact(MatchField.IN_PORT, OFPort.of(3))
            .setExact(MatchField.ETH_TYPE, EthType.IPv4)
            .setExact(MatchField.IPV4_SRC, IPv4Address.of(0xc0a8037f))
            .setExact(MatchField.IPV4_DST, IPv4Address.of(0xffffffff))
            .setExact(MatchField.ETH_SRC, MacAddress.of("01:23:45:67:89:ab"))
            .setExact(MatchField.ETH_DST, MacAddress.of("cd:ef:01:23:45:67"))
            .build()
    )
    .setIdleTimeout(5)
    .setFlags(Sets.immutableEnumSet(OFFlowModFlags.CHECK_OVERLAP))
    .setBufferId(OFBufferId.of(0))
    .setOutPort(OFPort.of(0)) // doesn't make that much sense, but is in the example
    .setActions(
        ImmutableList.of(
            factory.actions().output(OFPort.FLOOD, 0),
            factory.actions().niciraDecTtl(),
            factory.actions().bsnSetTunnelDst(0)
        )
    );