/* packet-openflow_v1.c

 * Routines for OpenFlow dissection

 * Copyright 2013, Anders Broman <anders.broman@ericsson.com>

 * Copyright 2013, Zoltan Lajos Kis <zoltan.lajos.kis@ericsson.com>

 *

 * Wireshark - Network traffic analyzer

 * By Gerald Combs <gerald@wireshark.org>

 * Copyright 1998 Gerald Combs

 *

 * SPDX-License-Identifier: GPL-2.0-or-later

 *

 * Ref https://www.opennetworking.org/sdn-resources/onf-specifications/openflow

 */

#include "config.h"

#include <epan/packet.h>

#include <epan/expert.h>

void proto_register_openflow_v1(void);

void proto_reg_handoff_openflow_v1(void);

static dissector_handle_t eth_withoutfcs_handle;

/* Initialize the protocol and registered fields */

static int proto_openflow_v1;

static int hf_openflow_version;

static int hf_openflow_1_0_type;

static int hf_openflow_length;

static int hf_openflow_xid;

static int hf_openflow_datapath_id;

static int hf_openflow_datapath_mac;

static int hf_openflow_datapath_impl;

static int hf_openflow_n_buffers;

static int hf_openflow_n_tables;

/* static int hf_openflow_auxiliary_id; */

static int hf_openflow_capabilities;

static int hf_openflow_actions;

/* static int hf_openflow_reserved32; */

static int hf_openflow_cap_flow_stats;

static int hf_openflow_table_stats;

static int hf_openflow_port_stats;

static int hf_openflow_group_stats;

static int hf_openflow_ip_reasm;

static int hf_openflow_queue_stats;

static int hf_openflow_port_blocked;

static int hf_openflow_output; /* Output to switch port. */

static int hf_openflow_set_vlan_vid; /* Set the 802.1q VLAN id. */

static int hf_openflow_set_vlan_pcp; /* Set the 802.1q priority. */

static int hf_openflow_strip_vlan; /* Strip the 802.1q header. */

static int hf_openflow_set_dl_src; /* Ethernet source address. */

static int hf_openflow_set_dl_dst; /* Ethernet destination address. */

static int hf_openflow_set_nw_src; /* IP source address. */

static int hf_openflow_set_nw_dst; /* IP destination address. */

static int hf_openflow_set_nw_tos; /* IP ToS (DSCP field, 6 bits). */

static int hf_openflow_set_tp_src; /* TCP/UDP source port. */

static int hf_openflow_set_tp_dst; /* TCP/UDP destination port. */

static int hf_openflow_enqueue; /* Output to queue. */

static int hf_openflow_port_no;

static int hf_openflow_hw_addr;

static int hf_openflow_port_name;

static int hf_openflow_port_config;

static int hf_openflow_port_state;

static int hf_openflow_port_curr;

static int hf_openflow_port_advertised;

static int hf_openflow_port_supported;

static int hf_openflow_port_peer;

static int hf_openflow_port_down;    /* Port is administratively down. */

static int hf_openflow_no_stp;       /* Disable 802.1D spanning tree on port. */

static int hf_openflow_no_recv;      /* Drop all packets except 802.1D spanning tree packets. */

static int hf_openflow_no_recv_stp;  /* Drop received 802.1D STP packets. */

static int hf_openflow_no_flood;     /* Do not include this port when flooding. */

static int hf_openflow_no_fwd;       /* Drop packets forwarded to port. */

static int hf_openflow_no_packet_in; /* Do not send packet-in msgs for port. */

static int hf_openflow_link_down;    /* No physical link present. */

static int hf_openflow_10mb_hd;      /* 10 Mb half-duplex rate support. */

static int hf_openflow_10mb_fd;      /* 10 Mb full-duplex rate support. */

static int hf_openflow_100mb_hd;     /* 100 Mb half-duplex rate support. */

static int hf_openflow_100mb_fd;     /* 100 Mb full-duplex rate support. */

static int hf_openflow_1gb_hd;       /* 1 Gb half-duplex rate support. */

static int hf_openflow_1gb_fd;       /* 1 Gb full-duplex rate support. */

static int hf_openflow_10gb_fd;      /* 10 Gb full-duplex rate support. */

static int hf_openflow_copper;       /* Copper medium. */

static int hf_openflow_fiber;        /* Fiber medium. */

static int hf_openflow_autoneg;      /* Auto-negotiation. */

static int hf_openflow_pause;        /* Pause. */

static int hf_openflow_pause_asym;   /* Asymmetric pause. */

static int hf_openflow_config_flags;

static int hf_openflow_miss_send_len;

static int hf_openflow_buffer_id;

static int hf_openflow_total_len;

static int hf_openflow_in_port;

static int hf_openflow_reason;

static int hf_openflow_pkt_in_pad;

static int hf_openflow_flow_removed_cookie;

static int hf_openflow_flow_removed_priority;

static int hf_openflow_flow_removed_reason;

static int hf_openflow_flow_removed_pad1;

static int hf_openflow_flow_removed_duration_sec;

static int hf_openflow_flow_removed_duration_nsec;

static int hf_openflow_flow_removed_idle_timeout;

static int hf_openflow_flow_removed_pad2;

static int hf_openflow_flow_removed_packet_count;

static int hf_openflow_flow_removed_byte_count;

static int hf_openflow_table_id;

static int hf_openflow_cookie;

/* static int hf_openflow_cookie_mask; */

static int hf_openflow_features_reply_pad;

static int hf_openflow_actions_len;

static int hf_openflow_action_type;

static int hf_openflow_action_len;

static int hf_openflow_output_port;

static int hf_openflow_max_len;

static int hf_openflow_wildcards;

static int hf_openflow_command;

static int hf_openflow_eth_src;

static int hf_openflow_eth_dst;

static int hf_openflow_dl_vlan;

static int hf_openflow_dl_vlan_pcp;

static int hf_openflow_ofp_match_pad;

static int hf_openflow_match_dl_type;

static int hf_openflow_ofp_match_tos;

static int hf_openflow_ofp_match_nw_proto;

static int hf_openflow_ofp_source_addr;

static int hf_openflow_ofp_dest_addr;

static int hf_openflow_ofp_source_port;

static int hf_openflow_ofp_dest_port;

static int hf_openflow_idle_timeout;

static int hf_openflow_hard_timeout;

static int hf_openflow_priority;

static int hf_openflow_out_port;

/* static int hf_openflow_out_group; */

static int hf_openflow_flags;

static int hf_openflow_v1_stats_type;

static int hf_openflow_v1_flow_stats_request_pad;

/* Initialize the subtree pointers */

static int ett_openflow;

static int ett_openflow_path_id;

static int ett_openflow_cap;

static int ett_openflow_act;

static int ett_openflow_port;

static int ett_openflow_port_cnf;

static int ett_openflow_port_state;

static int ett_openflow_port_cf;

/* static expert_field ei_openflow_undecoded_data; */

static expert_field ei_openflow_action_type;

static expert_field ei_openflow_1_0_type;

static const value_string openflow_version_values[] = {

    { 0x01, "1.0" },

    { 0, NULL }

};

/* Immutable messages. */

#define OFPT_1_0_HELLO                     0 /* Symmetric message */

#define OFPT_1_0_ERROR                     1 /* Symmetric message */

#define OFPT_1_0_ECHO_REQUEST              2 /* Symmetric message */

#define OFPT_1_0_ECHO_REPLY                3 /* Symmetric message */

#define OFPT_1_0_VENDOR                    4 /* Symmetric message */

/* Switch configuration messages. */

#define OFPT_1_0_FEATURES_REQUEST          5 /* Controller/switch message */

#define OFPT_1_0_FEATURES_REPLY            6 /* Controller/switch message */

#define OFPT_1_0_GET_CONFIG_REQUEST        7 /* Controller/switch message */

#define OFPT_1_0_GET_CONFIG_REPLY          8 /* Controller/switch message */

#define OFPT_1_0_SET_CONFIG                9 /* Controller/switch message */

/* Asynchronous messages. */

#define OFPT_1_0_PACKET_IN                10 /* Async message */

#define OFPT_1_0_FLOW_REMOVED             11 /* Async message */

#define OFPT_1_0_PORT_STATUS              12 /* Async message */

/* Controller command messages. */

#define OFPT_1_0_PACKET_OUT               13 /* Controller/switch message */

#define OFPT_1_0_FLOW_MOD                 14 /* Controller/switch message */

#define OFPT_1_0_PORT_MOD                 15 /* Controller/switch message */

/* Statistics messages. */

#define OFPT_1_0_STATS_REQUEST            16 /* Controller/switch message */

#define OFPT_1_0_STATS_REPLY              17 /* Controller/switch message */

/* Barrier messages. */

#define OFPT_1_0_BARRIER_REQUEST          18 /* Controller/switch message */

#define OFPT_1_0_BARRIER_REPLY            19 /* Controller/switch message */

/* Queue Configuration messages. */

#define OFPT_1_0_QUEUE_GET_CONFIG_REQUEST 20 /* Controller/switch message */

#define OFPT_1_0_QUEUE_GET_CONFIG_REPLY   21 /* Controller/switch message */

static const value_string openflow_1_0_type_values[] = {

/* Immutable messages. */

    { 0, "OFPT_HELLO" },                     /* Symmetric message */

    { 1, "OFPT_ERROR" },                     /* Symmetric message */

    { 2, "OFPT_ECHO_REQUEST" },              /* Symmetric message */

    { 3, "OFPT_ECHO_REPLY" },                /* Symmetric message */

    { 4, "OFPT_VENDOR" },                    /* Symmetric message */

/* Switch configuration messages. */

    { 5, "OFPT_FEATURES_REQUEST" },          /* Controller/switch message */

    { 6, "OFPT_FEATURES_REPLY" },            /* Controller/switch message */

    { 7, "OFPT_GET_CONFIG_REQUEST" },        /* Controller/switch message */

    { 8, "OFPT_GET_CONFIG_REPLY" },          /* Controller/switch message */

    { 9, "OFPT_SET_CONFIG" },                /* Controller/switch message */

/* Asynchronous messages. */

    { 10, "OFPT_PACKET_IN" },                /* Async message */

    { 11, "OFPT_FLOW_REMOVED" },             /* Async message */

    { 12, "OFPT_PORT_STATUS" },              /* Async message */

/* Controller command messages. */

    { 13, "OFPT_PACKET_OUT" },               /* Controller/switch message */

    { 14, "OFPT_FLOW_MOD" },                 /* Controller/switch message */

    { 15, "OFPT_PORT_MOD" },                 /* Controller/switch message */

/* Statistics messages. */

    { 16, "OFPT_STATS_REQUEST" },            /* Controller/switch message */

    { 17, "OFPT_STATS_REPLY" },              /* Controller/switch message */

/* Barrier messages. */

    { 18, "OFPT_BARRIER_REQUEST" },          /* Controller/switch message */

    { 19, "OFPT_BARRIER_REPLY" },            /* Controller/switch message */

/* Queue Configuration messages. */

    { 20, "OFPT_QUEUE_GET_CONFIG_REQUEST" }, /* Controller/switch message */

    { 21, "OFPT_QUEUE_GET_CONFIG_REPLY" },   /* Controller/switch message */

    { 0, NULL }

};

static value_string_ext openflow_1_0_type_values_ext = VALUE_STRING_EXT_INIT(openflow_1_0_type_values);

#define OFPC_FLOW_STATS   1<<0  /* Flow statistics. */

#define OFPC_TABLE_STATS  1<<1  /* Table statistics. */

#define OFPC_PORT_STATS   1<<2  /* Port statistics. */

#define OFPC_GROUP_STATS  1<<3  /* Group statistics. */

#define OFPC_IP_REASM     1<<5  /* Can reassemble IP fragments. */

#define OFPC_QUEUE_STATS  1<<6  /* Queue statistics. */

#define OFPC_PORT_BLOCKED 1<<8  /* Switch will block looping ports. */

#define OFPAT_OUTPUT_MASK       1<<0  /* Output to switch port. */

#define OFPAT_SET_VLAN_VID_MASK 1<<1  /* Set the 802.1q VLAN id. */

#define OFPAT_SET_VLAN_PCP_MASK 1<<2  /* Set the 802.1q priority. */

#define OFPAT_STRIP_VLAN_MASK   1<<3  /* Strip the 802.1q header. */

#define OFPAT_SET_DL_SRC_MASK   1<<4  /* Ethernet source address. */

#define OFPAT_SET_DL_DST_MASK   1<<5  /* Ethernet destination address. */

#define OFPAT_SET_NW_SRC_MASK   1<<6  /* IP source address. */

#define OFPAT_SET_NW_DST_MASK   1<<7  /* IP destination address. */

#define OFPAT_SET_NW_TOS_MASK   1<<8  /* IP ToS (DSCP field, 6 bits). */

#define OFPAT_SET_TP_SRC_MASK   1<<9  /* TCP/UDP source port. */

#define OFPAT_SET_TP_DST_MASK   1<<10 /* TCP/UDP destination port. */

#define OFPAT_ENQUEUE_MASK      1<<11 /* Output to queue. */

#define OFPPC_PORT_DOWN    1<<0 /* Port is administratively down. */

#define OFPPC_NO_STP       1<<1 /* Disable 802.1D spanning tree on port. */

#define OFPPC_NO_RECV      1<<2 /* Drop all packets except 802.1D spanning tree packets. */

#define OFPPC_NO_RECV_STP  1<<3 /* Drop received 802.1D STP packets. */

#define OFPPC_NO_FLOOD     1<<4 /* Do not include this port when flooding. */

#define OFPPC_NO_FWD       1<<5 /* Drop packets forwarded to port. */

#define OFPPC_NO_PACKET_IN 1<<6 /* Do not send packet-in msgs for port. */

#define OFP_MAX_PORT_NAME_LEN 16

#define OFPPS_LINK_DOWN    1<<0 /* No physical link present. */

#define OFPPS_STP_LISTEN   0<<8 /* Not learning or relaying frames. */

#define OFPPS_STP_LEARN    1<<8 /* Learning but not relaying frames. */

#define OFPPS_STP_FORWARD  2<<8 /* Learning and relaying frames. */

#define OFPPS_STP_BLOCK    3<<8 /* Not part of spanning tree. */

#define OFPPS_STP_MASK     3<<8 /* Bit mask for OFPPS_STP_* values. */

#define OFPPF_10MB_HD      1<<0  /* 10 Mb half-duplex rate support. */

#define OFPPF_10MB_FD      1<<1  /* 10 Mb full-duplex rate support. */

#define OFPPF_100MB_HD     1<<2  /* 100 Mb half-duplex rate support. */

#define OFPPF_100MB_FD     1<<3  /* 100 Mb full-duplex rate support. */

#define OFPPF_1GB_HD       1<<4  /* 1 Gb half-duplex rate support. */

#define OFPPF_1GB_FD       1<<5  /* 1 Gb full-duplex rate support. */

#define OFPPF_10GB_FD      1<<6  /* 10 Gb full-duplex rate support. */

#define OFPPF_COPPER       1<<7  /* Copper medium. */

#define OFPPF_FIBER        1<<8  /* Fiber medium. */

#define OFPPF_AUTONEG      1<<9  /* Auto-negotiation. */

#define OFPPF_PAUSE        1<<10 /* Pause. */

#define OFPPF_PAUSE_ASYM   1<<11 /* Asymmetric pause. */

#define OFPAT_OUTPUT         0 /* Output to switch port. */

#define OFPAT_SET_VLAN_VID   1 /* Set the 802.1q VLAN id. */

#define OFPAT_SET_VLAN_PCP   2 /* Set the 802.1q priority. */

#define OFPAT_STRIP_VLAN     3 /* Strip the 802.1q header. */

#define OFPAT_SET_DL_SRC     4 /* Ethernet source address. */

#define OFPAT_SET_DL_DST     5 /* Ethernet destination address. */

#define OFPAT_SET_NW_SRC     6 /* IP source address. */

#define OFPAT_SET_NW_DST     7 /* IP destination address. */

#define OFPAT_SET_TP_SRC     8 /* TCP/UDP source port. */

#define OFPAT_SET_TP_DST     9 /* TCP/UDP destination port. */

#define OFPAT_VENDOR         0xffff

static int

dissect_openflow_ofp_match_v1(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree, int offset)

{

    /* uint32_t wildcards; Wildcard fields. */

    proto_tree_add_item(tree, hf_openflow_wildcards, tvb, offset, 4, ENC_BIG_ENDIAN);

    offset+=4;

    /* uint16_t in_port; Input switch port. */

    proto_tree_add_item(tree, hf_openflow_in_port, tvb, offset, 2, ENC_BIG_ENDIAN);

    offset+=2;

    /* uint8_t dl_src[OFP_ETH_ALEN];  Ethernet source address. */

    proto_tree_add_item(tree, hf_openflow_eth_src, tvb, offset, 6, ENC_NA);

    offset+=6;

    /* uint8_t dl_dst[OFP_ETH_ALEN]; Ethernet destination address. */

    proto_tree_add_item(tree, hf_openflow_eth_dst, tvb, offset, 6, ENC_NA);

    offset+=6;

    /* uint16_t dl_vlan; Input VLAN id. */

    proto_tree_add_item(tree, hf_openflow_dl_vlan, tvb, offset, 2, ENC_BIG_ENDIAN);

    offset+=2;

    /* uint8_t dl_vlan_pcp; Input VLAN priority. */

    proto_tree_add_item(tree, hf_openflow_dl_vlan_pcp, tvb, offset, 1, ENC_BIG_ENDIAN);

    offset++;

    /* uint8_t pad1[1]; Align to 64-bits */

    proto_tree_add_item(tree, hf_openflow_ofp_match_pad, tvb, offset, 1, ENC_NA);

    offset++;

    /* uint16_t dl_type; Ethernet frame type. */

    proto_tree_add_item(tree, hf_openflow_match_dl_type, tvb, offset, 2, ENC_BIG_ENDIAN);

    offset += 2;

    /* uint8_t nw_tos; IP ToS (actually DSCP field, 6 bits). */

    proto_tree_add_item(tree, hf_openflow_ofp_match_tos, tvb, offset, 1, ENC_NA);

    offset++;

    /* uint8_t nw_proto; IP protocol or lower 8 bits of

     * ARP opcode.

     */

    proto_tree_add_item(tree, hf_openflow_ofp_match_nw_proto, tvb, offset, 1, ENC_NA);

    offset++;

    /* uint8_t pad2[2]; Align to 64-bits */

    proto_tree_add_item(tree, hf_openflow_ofp_match_pad, tvb, offset, 2, ENC_NA);

    offset += 2;

    /* uint32_t nw_src; IP source address. */

    proto_tree_add_item(tree, hf_openflow_ofp_source_addr, tvb, offset, 4, ENC_BIG_ENDIAN);

    offset += 4;

    /* uint32_t nw_dst; IP destination address. */

    proto_tree_add_item(tree, hf_openflow_ofp_dest_addr, tvb, offset, 4, ENC_BIG_ENDIAN);

    offset += 4;

    /* uint16_t tp_src; TCP/UDP source port. */

    proto_tree_add_item(tree, hf_openflow_ofp_source_port, tvb, offset, 2, ENC_BIG_ENDIAN);

    offset += 2;

    /* uint16_t tp_dst; TCP/UDP destination port. */

    proto_tree_add_item(tree, hf_openflow_ofp_dest_port, tvb, offset, 2, ENC_BIG_ENDIAN);

    offset += 2;

    return offset;

}

static int

dissect_openflow_flow_stats_request_v1(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, int offset)

{

    /* struct ofp_match match;  Fields to match */

    offset = dissect_openflow_ofp_match_v1(tvb, pinfo, tree, offset);

    /* uint8_t table_id; ID of table to read (from ofp_table_stats),

     * 0xff for all tables or 0xfe for emergency.

     */

    proto_tree_add_item(tree, hf_openflow_table_id, tvb, offset, 1, ENC_BIG_ENDIAN);

    offset++;

    /* uint8_t pad;  Align to 32 bits. */

    proto_tree_add_item(tree, hf_openflow_v1_flow_stats_request_pad, tvb, offset, 1, ENC_BIG_ENDIAN);

    offset++;

    /* uint16_t out_port; */

    proto_tree_add_item(tree, hf_openflow_out_port, tvb, offset, 2, ENC_BIG_ENDIAN);

    offset += 2;

    return offset;

}

static const value_string openflow_action_values[] = {

    { OFPAT_OUTPUT,          "Output to switch port" },

    { OFPAT_SET_VLAN_VID,    "Set the 802.1q VLAN id" },

    { OFPAT_SET_VLAN_PCP,    "Set the 802.1q priority" },

    { OFPAT_STRIP_VLAN,      "Strip the 802.1q header" },

    { OFPAT_SET_DL_SRC,      "Ethernet source address" },

    { OFPAT_SET_DL_DST,      "Ethernet destination address" },

    { OFPAT_SET_NW_SRC,      "IP source address" },

    { OFPAT_SET_NW_DST,      "IP destination address" },

    { OFPAT_SET_TP_SRC,      "TCP/UDP source port" },

    { OFPAT_SET_TP_DST,      "TCP/UDP destination port" },

    { OFPAT_VENDOR,          "Vendor specific action"},

    { 0, NULL }

};

static int

dissect_openflow_action_header(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, int offset)

{

    uint16_t action_type, action_len;

    proto_item* ti;

    /* uint16_t type;  One of OFPAT_*. */

    ti = proto_tree_add_item_ret_uint16(tree, hf_openflow_action_type, tvb, offset, 2, ENC_BIG_ENDIAN, &action_type);

    offset+=2;

    /* Length of action, including this

     * header. This is the length of action,

     * including any padding to make it

     * 64-bit aligned.

     */

    proto_tree_add_item_ret_uint16(tree, hf_openflow_action_len, tvb, offset, 2, ENC_BIG_ENDIAN, &action_len);

    offset+=2;

    switch(action_type){

    case OFPAT_OUTPUT:

        /* uint16_t port;  Output port. */

        proto_tree_add_item(tree, hf_openflow_output_port, tvb, offset, 2, ENC_BIG_ENDIAN);

        offset+=2;

        /* uint16_t max_len;  Max length to send to controller. */

        proto_tree_add_item(tree, hf_openflow_max_len, tvb, offset, 2, ENC_BIG_ENDIAN);

        offset+=2;

        break;

    default:

        expert_add_info(pinfo, ti, &ei_openflow_action_type);

        offset+=(action_len-4);

        break;

    }

    return offset;

}

static void

dissect_openflow_phy_port(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree, int offset)

{

    proto_item *ti;

    proto_tree *port_cnf_tree, *port_state_tree, *port_cf_tree;

    proto_tree_add_item(tree, hf_openflow_port_no, tvb, offset, 2, ENC_BIG_ENDIAN);

    offset+=2;

    proto_tree_add_item(tree, hf_openflow_hw_addr, tvb, offset, 6, ENC_NA);

    offset+=6;

    proto_tree_add_item(tree, hf_openflow_port_name, tvb, offset, OFP_MAX_PORT_NAME_LEN, ENC_ASCII);

    offset+=OFP_MAX_PORT_NAME_LEN;

    /* Bitmap of OFPPC_* flags. */

    ti = proto_tree_add_item(tree, hf_openflow_port_config, tvb, offset, 4, ENC_BIG_ENDIAN);

    port_cnf_tree = proto_item_add_subtree(ti, ett_openflow_port_cnf);

    /* Port is administratively down. */

    proto_tree_add_item(port_cnf_tree, hf_openflow_port_down, tvb, offset, 4, ENC_BIG_ENDIAN);

    /* Disable 802.1D spanning tree on port. */

    proto_tree_add_item(port_cnf_tree, hf_openflow_no_stp, tvb, offset, 4, ENC_BIG_ENDIAN);

    /* Drop all packets except 802.1D spanning tree packets. */

    proto_tree_add_item(port_cnf_tree, hf_openflow_no_recv, tvb, offset, 4, ENC_BIG_ENDIAN);

    /* Drop received 802.1D STP packets. */

    proto_tree_add_item(port_cnf_tree, hf_openflow_no_recv_stp, tvb, offset, 4, ENC_BIG_ENDIAN);

    /* Do not include this port when flooding. */

    proto_tree_add_item(port_cnf_tree, hf_openflow_no_flood, tvb, offset, 4, ENC_BIG_ENDIAN);

     /* Drop packets forwarded to port. */

    proto_tree_add_item(port_cnf_tree, hf_openflow_no_fwd, tvb, offset, 4, ENC_BIG_ENDIAN);

    /* Do not send packet-in msgs for port. */

    proto_tree_add_item(port_cnf_tree, hf_openflow_no_packet_in, tvb, offset, 4, ENC_BIG_ENDIAN);

    offset+=4;

    /* Bitmap of OFPPS_* flags. */

    ti = proto_tree_add_item(tree, hf_openflow_port_state, tvb, offset, 4, ENC_BIG_ENDIAN);

    port_state_tree = proto_item_add_subtree(ti, ett_openflow_port_state);

    /* No physical link present. */

    proto_tree_add_item(port_state_tree, hf_openflow_link_down, tvb, offset, 4, ENC_BIG_ENDIAN);

    offset+=4;

    /* Current features. */

    ti = proto_tree_add_item(tree, hf_openflow_port_curr, tvb, offset, 4, ENC_BIG_ENDIAN);

    port_cf_tree = proto_item_add_subtree(ti, ett_openflow_port_cf);

    /* 10 Mb half-duplex rate support. */

    proto_tree_add_item(port_cf_tree, hf_openflow_10mb_hd, tvb, offset, 4, ENC_BIG_ENDIAN);

    /* 10 Mb full-duplex rate support. */

    proto_tree_add_item(port_cf_tree, hf_openflow_10mb_fd, tvb, offset, 4, ENC_BIG_ENDIAN);

    /* 100 Mb half-duplex rate support. */

    proto_tree_add_item(port_cf_tree, hf_openflow_100mb_hd, tvb, offset, 4, ENC_BIG_ENDIAN);

    /* 100 Mb full-duplex rate support. */

    proto_tree_add_item(port_cf_tree, hf_openflow_100mb_fd, tvb, offset, 4, ENC_BIG_ENDIAN);

    /* 1 Gb half-duplex rate support. */

    proto_tree_add_item(port_cf_tree, hf_openflow_1gb_hd, tvb, offset, 4, ENC_BIG_ENDIAN);

    /* 1 Gb full-duplex rate support. */

    proto_tree_add_item(port_cf_tree, hf_openflow_1gb_fd, tvb, offset, 4, ENC_BIG_ENDIAN);

    /* 10 Gb full-duplex rate support. */

    proto_tree_add_item(port_cf_tree, hf_openflow_10gb_fd, tvb, offset, 4, ENC_BIG_ENDIAN);

    /* Copper medium. */

    proto_tree_add_item(port_cf_tree, hf_openflow_copper, tvb, offset, 4, ENC_BIG_ENDIAN);

    /* Fiber medium. */

    proto_tree_add_item(port_cf_tree, hf_openflow_fiber, tvb, offset, 4, ENC_BIG_ENDIAN);

    /* Auto-negotiation. */

    proto_tree_add_item(port_cf_tree, hf_openflow_autoneg, tvb, offset, 4, ENC_BIG_ENDIAN);

    /* Pause. */

    proto_tree_add_item(port_cf_tree, hf_openflow_pause, tvb, offset, 4, ENC_BIG_ENDIAN);

    /* Asymmetric pause. */

    proto_tree_add_item(port_cf_tree, hf_openflow_pause_asym, tvb, offset, 4, ENC_BIG_ENDIAN);

    offset+=4;

    /* Features being advertised by the port. */

    proto_tree_add_item(tree, hf_openflow_port_advertised, tvb, offset, 4, ENC_BIG_ENDIAN);

    offset+=4;

    /* Features supported by the port. */

    proto_tree_add_item(tree, hf_openflow_port_supported, tvb, offset, 4, ENC_BIG_ENDIAN);

    offset+=4;

    /* Features advertised by peer. */

    proto_tree_add_item(tree, hf_openflow_port_peer, tvb, offset, 4, ENC_BIG_ENDIAN);

}

#if 0

/*

 * Switch features.

 */

struct ofp_switch_features {

    struct ofp_header   header;

    uint64_t            datapath_id;  /* Datapath unique ID. The lower 48-bits are for

                                         a MAC address, while the upper 16-bits are

                                         implementer-defined. */

    uint32_t            n_buffers;    /* Max packets buffered at once. */

    uint8_t             n_tables;     /* Number of tables supported by datapath. */

    uint8_t             pad[3];       /* Align to 64-bits. */

    /* Features. */

    uint32_t            capabilities; /* Bitmap of support "ofp_capabilities". */

    uint32_t            actions;      /* Bitmap of supported "ofp_action_type"s. */

    /* Port info.*/

    struct ofp_phy_port ports[0];     /* Port definitions. The number of ports

                                         is inferred from the length field in

                                         the header. */

#endif

static void

dissect_openflow_features_reply_v1(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, int offset, uint16_t length)

{

    proto_item *ti;

    proto_tree *path_id_tree, *cap_tree, *act_tree;

    uint16_t length_remaining;

    ti = proto_tree_add_item(tree, hf_openflow_datapath_id, tvb, offset, 8, ENC_BIG_ENDIAN);

    path_id_tree = proto_item_add_subtree(ti, ett_openflow_path_id);

    proto_tree_add_item(path_id_tree, hf_openflow_datapath_impl, tvb, offset, 2, ENC_BIG_ENDIAN);

    offset+=2;

    proto_tree_add_item(path_id_tree, hf_openflow_datapath_mac, tvb, offset, 6, ENC_NA);

    offset+=6;

    proto_tree_add_item(tree, hf_openflow_n_buffers, tvb, offset, 4, ENC_BIG_ENDIAN);

    offset+=4;

    proto_tree_add_item(tree, hf_openflow_n_tables, tvb, offset, 1, ENC_BIG_ENDIAN);

    offset++;

    proto_tree_add_item(tree, hf_openflow_features_reply_pad, tvb, offset, 3, ENC_NA);

    offset+=3;

    ti = proto_tree_add_item(tree, hf_openflow_capabilities, tvb, offset, 4, ENC_BIG_ENDIAN);

    cap_tree = proto_item_add_subtree(ti, ett_openflow_cap);

    /* Dissect flags */

    proto_tree_add_item(cap_tree, hf_openflow_cap_flow_stats, tvb, offset, 4, ENC_BIG_ENDIAN);

    proto_tree_add_item(cap_tree, hf_openflow_table_stats,    tvb, offset, 4, ENC_BIG_ENDIAN);

    proto_tree_add_item(cap_tree, hf_openflow_port_stats,     tvb, offset, 4, ENC_BIG_ENDIAN);

    proto_tree_add_item(cap_tree, hf_openflow_group_stats,    tvb, offset, 4, ENC_BIG_ENDIAN);

    proto_tree_add_item(cap_tree, hf_openflow_ip_reasm,       tvb, offset, 4, ENC_BIG_ENDIAN);

    proto_tree_add_item(cap_tree, hf_openflow_queue_stats,    tvb, offset, 4, ENC_BIG_ENDIAN);

    proto_tree_add_item(cap_tree, hf_openflow_port_blocked,   tvb, offset, 4, ENC_BIG_ENDIAN);

    offset+=4;

    ti = proto_tree_add_item(tree, hf_openflow_actions, tvb, offset, 4, ENC_BIG_ENDIAN);

    act_tree = proto_item_add_subtree(ti, ett_openflow_act);

    /* Dissect flags */

    proto_tree_add_item(act_tree, hf_openflow_output, tvb, offset, 4, ENC_BIG_ENDIAN);

    proto_tree_add_item(act_tree, hf_openflow_set_vlan_vid, tvb, offset, 4, ENC_BIG_ENDIAN);

    proto_tree_add_item(act_tree, hf_openflow_set_vlan_pcp, tvb, offset, 4, ENC_BIG_ENDIAN);

    proto_tree_add_item(act_tree, hf_openflow_strip_vlan, tvb, offset, 4, ENC_BIG_ENDIAN);

    proto_tree_add_item(act_tree, hf_openflow_set_dl_src, tvb, offset, 4, ENC_BIG_ENDIAN);

    proto_tree_add_item(act_tree, hf_openflow_set_dl_dst, tvb, offset, 4, ENC_BIG_ENDIAN);

    proto_tree_add_item(act_tree, hf_openflow_set_nw_src, tvb, offset, 4, ENC_BIG_ENDIAN);

    proto_tree_add_item(act_tree, hf_openflow_set_nw_dst, tvb, offset, 4, ENC_BIG_ENDIAN);

    proto_tree_add_item(act_tree, hf_openflow_set_nw_tos, tvb, offset, 4, ENC_BIG_ENDIAN);

    proto_tree_add_item(act_tree, hf_openflow_set_tp_src, tvb, offset, 4, ENC_BIG_ENDIAN);

    proto_tree_add_item(act_tree, hf_openflow_set_tp_dst, tvb, offset, 4, ENC_BIG_ENDIAN);

    proto_tree_add_item(act_tree, hf_openflow_enqueue, tvb, offset, 4, ENC_BIG_ENDIAN);

    offset+=4;

    length_remaining = length-32;

    if(length_remaining > 0){

        uint16_t num_ports = length_remaining/48;

        int i;

        if((length_remaining&0x003f) != 0){

            /* protocol_error */

        }

        for(i=0; i<num_ports ;i++){

            proto_tree *port_tree;

            port_tree = proto_tree_add_subtree_format(tree, tvb, offset, 48, ett_openflow_port, NULL, "Port data %u",i+1);

            dissect_openflow_phy_port(tvb, pinfo, port_tree, offset);

            offset+=48;

        }

    }

}

static void

dissect_openflow_switch_config(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree, int offset, uint16_t length _U_)

{

    /* ofp_config_flags */

    proto_tree_add_item(tree, hf_openflow_config_flags, tvb, offset, 2, ENC_BIG_ENDIAN);

    offset+=2;

    /* miss_send_len */

    proto_tree_add_item(tree, hf_openflow_miss_send_len, tvb, offset, 2, ENC_BIG_ENDIAN);

    /*offset+=2;*/

}

#define OFPR_NO_MATCH       0        /* No matching flow (table-miss flow entry). */

#define OFPR_ACTION         1        /* Action explicitly output to controller. */

#define OFPR_INVALID_TTL    2        /* Packet has invalid TTL */

static const value_string openflow_reason_values[] = {

    { OFPR_NO_MATCH,    "No matching flow (table-miss flow entry)" },

    { OFPR_ACTION,      "Action explicitly output to controller" },

    { OFPR_INVALID_TTL, "Packet has invalid TTL" },

    { 0, NULL }

};

static void

dissect_openflow_pkt_in(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, int offset, uint16_t length)

{

    tvbuff_t *next_tvb;

    /* uint32_t buffer_id;  ID assigned by datapath. */

    proto_tree_add_item(tree, hf_openflow_buffer_id, tvb, offset, 4, ENC_BIG_ENDIAN);

    offset+=4;

    /* uint16_t total_len;  Full length of frame. */

    proto_tree_add_item(tree, hf_openflow_total_len, tvb, offset, 2, ENC_BIG_ENDIAN);

    offset+=2;

    /* uint16_t in_port;  Port on which frame was received. */

    proto_tree_add_item(tree, hf_openflow_in_port, tvb, offset, 2, ENC_BIG_ENDIAN);

    offset+=2;

    /* uint8_t reason; Reason packet is being sent (one of OFPR_*) */

    proto_tree_add_item(tree, hf_openflow_reason, tvb, offset, 1, ENC_BIG_ENDIAN);

    offset++;

    proto_tree_add_item(tree, hf_openflow_pkt_in_pad, tvb, offset, 1, ENC_NA);

    offset+=1;

    next_tvb = tvb_new_subset_length(tvb, offset, length-offset);

    call_dissector(eth_withoutfcs_handle, next_tvb, pinfo, tree);

}

#define OFPRR_IDLE_TIMEOUT  0

#define OFPRR_HARD_TIMEOUT  1

#define OFPRR_DELETE        2

static const value_string openflow_flow_removed_reason_values[] = {

    { OFPRR_IDLE_TIMEOUT, "OFPRR_IDLE_TIMEOUT" },

    { OFPRR_HARD_TIMEOUT, "OFPRR_HARD_TIMEOUT" },

    { OFPRR_DELETE,       "OFPRR_DELETE" },

    { 0,                  NULL }

};

static void

dissect_openflow_flow_removed(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, int offset, uint16_t length _U_)

{

    /* struct match; */

    offset = dissect_openflow_ofp_match_v1(tvb, pinfo, tree, offset);

    /* uint64_t cookie; */

    proto_tree_add_item(tree, hf_openflow_flow_removed_cookie, tvb, offset, 8, ENC_BIG_ENDIAN);

    offset+=8;

    /* uint16_t priority; */

    proto_tree_add_item(tree, hf_openflow_flow_removed_priority, tvb, offset, 2, ENC_BIG_ENDIAN);

    offset+=2;

    /* uint8_t reason; */

    proto_tree_add_item(tree, hf_openflow_flow_removed_reason, tvb, offset, 1, ENC_BIG_ENDIAN);

    offset+=1;

    /* uint8_t pad1; */

    proto_tree_add_item(tree, hf_openflow_flow_removed_pad1, tvb, offset, 1, ENC_BIG_ENDIAN);

    offset+=1;

    /* uint32_t duration_sec; */

    proto_tree_add_item(tree, hf_openflow_flow_removed_duration_sec, tvb, offset, 4, ENC_BIG_ENDIAN);

    offset+=4;

    /* uint32_t duration_nsec; */

    proto_tree_add_item(tree, hf_openflow_flow_removed_duration_nsec, tvb, offset, 4, ENC_BIG_ENDIAN);

    offset+=4;

    /* uint16_t idle_timeout; */

    proto_tree_add_item(tree, hf_openflow_flow_removed_idle_timeout, tvb, offset, 2, ENC_BIG_ENDIAN);

    offset+=2;

    /* uint8_t pad2; */

    proto_tree_add_item(tree, hf_openflow_flow_removed_pad2, tvb, offset, 2, ENC_BIG_ENDIAN);

    offset+=2;

    /* uint64_t packet_count; */

    proto_tree_add_item(tree, hf_openflow_flow_removed_packet_count, tvb, offset, 8, ENC_BIG_ENDIAN);

    offset+=8;

    /* uint64_t byte_count; */

    proto_tree_add_item(tree, hf_openflow_flow_removed_byte_count, tvb, offset, 8, ENC_BIG_ENDIAN);

}

static void

dissect_openflow_pkt_out(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, int offset, uint16_t length)

{

    tvbuff_t *next_tvb;

    int32_t buffer_id;

    /* uint32_t buffer_id;  ID assigned by datapath. */

    buffer_id = tvb_get_ntohl(tvb, offset);

    proto_tree_add_item(tree, hf_openflow_buffer_id, tvb, offset, 4, ENC_BIG_ENDIAN);

    offset+=4;

    /* uint32_t in_port; Packet's input port or OFPP_CONTROLLER. */

    proto_tree_add_item(tree, hf_openflow_in_port, tvb, offset, 2, ENC_BIG_ENDIAN);

    offset+=2;

    /* uint16_t actions_len;  Size of action array in bytes. */

    proto_tree_add_item(tree, hf_openflow_actions_len, tvb, offset, 2, ENC_BIG_ENDIAN);

    offset+=2;

    /* struct ofp_action_header actions[0];  Action list. */

    offset = dissect_openflow_action_header(tvb, pinfo, tree, offset);

    /* Packet data. The length is inferred

       from the length field in the header.

       (Only meaningful if buffer_id == -1.)

     */

    if(buffer_id == -1){

        next_tvb = tvb_new_subset_length(tvb, offset, length-offset);

        call_dissector(eth_withoutfcs_handle, next_tvb, pinfo, tree);

    }

}

#define OFPFC_ADD             0 /* New flow. */

#define OFPFC_MODIFY          1 /* Modify all matching flows. */

#define OFPFC_MODIFY_STRICT   2 /* Modify entry strictly matching wildcards */

#define OFPFC_DELETE          3 /* Delete all matching flows. */

#define OFPFC_DELETE_STRICT   4 /* Strictly match wildcards and priority. */

static const value_string openflow_command_values[] = {

    { OFPFC_ADD,            "New flow" },

    { OFPFC_MODIFY,         "Modify all matching flows" },

    { OFPFC_MODIFY_STRICT,  "Modify entry strictly matching wildcards" },

    { OFPFC_DELETE,         "Delete all matching flows" },

    { OFPFC_DELETE_STRICT,  "Strictly match wildcards and priority" },

    { 0, NULL }

};

static void

dissect_openflow_flow_mod(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, int offset, uint16_t length _U_)

{

    /* struct ofp_match match;  Fields to match */

    offset = dissect_openflow_ofp_match_v1(tvb, pinfo, tree, offset);

    /* uint64_t cookie; Opaque controller-issued identifier. */

    proto_tree_add_item(tree, hf_openflow_cookie, tvb, offset, 8, ENC_BIG_ENDIAN);

    offset += 8;

    /* uint16_t command;  One of OFPFC_*. */

    proto_tree_add_item(tree, hf_openflow_command, tvb, offset, 2, ENC_BIG_ENDIAN);

    offset += 2;

    /* uint16_t idle_timeout;  Idle time before discarding (seconds). */

    proto_tree_add_item(tree, hf_openflow_idle_timeout, tvb, offset, 2, ENC_BIG_ENDIAN);

    offset += 2;

    /* uint16_t hard_timeout; Max time before discarding (seconds). */

    proto_tree_add_item(tree, hf_openflow_hard_timeout, tvb, offset, 2, ENC_BIG_ENDIAN);

    offset += 2;

    /* uint16_t priority; Priority level of flow entry. */

    proto_tree_add_item(tree, hf_openflow_priority, tvb, offset, 2, ENC_BIG_ENDIAN);

    offset += 2;

    /* uint32_t buffer_id;  Buffered packet to apply to, or OFP_NO_BUFFER.

       Not meaningful for OFPFC_DELETE*.

     */

    proto_tree_add_item(tree, hf_openflow_buffer_id, tvb, offset, 4, ENC_BIG_ENDIAN);

    offset += 4;

    /* uint32_t out_port; For OFPFC_DELETE* commands, require

       matching entries to include this as an output port. A value of OFPP_ANY

       indicates no restriction.

       */

    proto_tree_add_item(tree, hf_openflow_out_port, tvb, offset, 2, ENC_BIG_ENDIAN);

    offset += 2;

    /* uint16_t flags; One of OFPFF_*. */

    proto_tree_add_item(tree, hf_openflow_flags, tvb, offset, 2, ENC_BIG_ENDIAN);

    offset+=2;

    dissect_openflow_action_header(tvb, pinfo, tree, offset);

}

#define    OFPST_DESC 0

#define    OFPST_FLOW 1

#define    OFPST_AGGREGATE 2

#define    OFPST_TABLE 3

#define    OFPST_PORT 4

#define    OFPST_QUEUE 5

#define    OFPST_VENDOR  0xffff

static const value_string openflow_stats_type_values[] = {

    { OFPST_DESC,         "OFPST_DESC" },

    { OFPST_FLOW,         "OFPST_FLOW" },

    { OFPST_AGGREGATE,    "OFPST_AGGREGATE" },

    { OFPST_TABLE,        "OFPST_TABLE" },

    { OFPST_PORT,         "OFPST_PORT" },

    { OFPST_QUEUE,        "OFPST_QUEUE" },

    { OFPST_VENDOR,       "OFPST_VENDOR" },

    { 0, NULL }

};

static int

dissect_openflow_stats_req(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, int offset, uint16_t length _U_)

{

    proto_item *type_item;

    uint32_t type;

    /* uint16_t type; */

    type_item = proto_tree_add_item_ret_uint(tree, hf_openflow_v1_stats_type, tvb, offset, 2, ENC_BIG_ENDIAN, &type);

    offset += 2;

    /* uint16_t flags; OFPSF_REQ_* flags (none yet defined). */

    proto_tree_add_item(tree, hf_openflow_flags, tvb, offset, 2, ENC_BIG_ENDIAN);

    offset += 2;

    /* uint8_t body[0];  Body of the request. */

    switch (type) {

    case OFPST_DESC:

        /* The request body is empty. */

        break;

    case OFPST_FLOW:

        dissect_openflow_flow_stats_request_v1(tvb, pinfo, tree, offset);

        break;

    default:

        expert_add_info(pinfo, type_item, &ei_openflow_1_0_type);

        break;

    }

    return offset;

}

static int

dissect_openflow_stats_resp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, int offset, uint16_t length)

{

    proto_item *type_item;

    uint32_t type;

    /* uint16_t type; */

    type_item = proto_tree_add_item_ret_uint(tree, hf_openflow_v1_stats_type, tvb, offset, 2, ENC_BIG_ENDIAN, &type);

    offset += 2;

    /* uint16_t flags; OFPSF_REQ_ */

    proto_tree_add_item(tree, hf_openflow_flags, tvb, offset, 2, ENC_BIG_ENDIAN);

    offset += 2;

    /* uint8_t body[0];  Body of the request. */

    if (length == 12 ) {

        /* No body */

        return offset;

    }

    switch (type) {

    case OFPST_DESC:

        /* The request body is empty. */

        break;

    case OFPST_FLOW:

        /* fall trough */

    default:

        expert_add_info(pinfo, type_item, &ei_openflow_1_0_type);

        break;

    }

    return offset;

}

static int

dissect_openflow_v1(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)

{

    proto_item *ti, *type_item;

    proto_tree *openflow_tree;

    unsigned offset = 0;

    uint8_t type;

    uint16_t length;

    type    = tvb_get_uint8(tvb, 1);

    col_append_fstr(pinfo->cinfo, COL_INFO, "Type: %s",

                  val_to_str_ext_const(type, &openflow_1_0_type_values_ext, "Unknown message type"));

    /* Stop the Ethernet frame from overwriting the columns */

    if((type == OFPT_1_0_PACKET_IN) || (type == OFPT_1_0_PACKET_OUT)){

        col_set_writable(pinfo->cinfo, -1, false);

    }

    /* Create display subtree for the protocol */

    ti = proto_tree_add_item(tree, proto_openflow_v1, tvb, 0, -1, ENC_NA);

    openflow_tree = proto_item_add_subtree(ti, ett_openflow);

    /* A.1 OpenFlow Header. */

    /* OFP_VERSION. */

    proto_tree_add_item(openflow_tree, hf_openflow_version, tvb, offset, 1, ENC_BIG_ENDIAN);

    offset++;

    /* One of the OFPT_ constants. */

    type_item = proto_tree_add_item(openflow_tree, hf_openflow_1_0_type, tvb, offset, 1, ENC_BIG_ENDIAN);

    offset++;

    /* Length including this ofp_header. */

    proto_tree_add_item_ret_uint16(openflow_tree, hf_openflow_length, tvb, offset, 2, ENC_BIG_ENDIAN, &length);

    offset+=2;

    /* Transaction id associated with this packet. Replies use the same id as was in the request

     * to facilitate pairing.

     */

    proto_tree_add_item(openflow_tree, hf_openflow_xid, tvb, offset, 4, ENC_BIG_ENDIAN);

    offset+=4;

    switch(type){

    case OFPT_1_0_HELLO: /* 0 */

        /* 5.5.1 Hello

         * The OFPT_HELLO message has no body;

         */

        break;

    case OFPT_1_0_FEATURES_REQUEST: /* 5 */

        /* 5.3.1 Handshake

         * Upon TLS session establishment, the controller sends an OFPT_FEATURES_REQUEST

         * message. This message does not contain a body beyond the OpenFlow header.

         */

        break;

    case OFPT_1_0_FEATURES_REPLY: /* 6 */

        dissect_openflow_features_reply_v1(tvb, pinfo, openflow_tree, offset, length);

        break;

    case OFPT_1_0_GET_CONFIG_REQUEST: /* 7 */

        /* A.3.2 There is no body for OFPT_GET_CONFIG_REQUEST beyond the OpenFlow header. */

        break;

    case OFPT_1_0_GET_CONFIG_REPLY: /* 8 */

        /* Fall trough */

    case OFPT_1_0_SET_CONFIG: /* 9 */

        dissect_openflow_switch_config(tvb, pinfo, openflow_tree, offset, length);

        break;

    case OFPT_1_0_PACKET_IN: /* 10 */

        dissect_openflow_pkt_in(tvb, pinfo, openflow_tree, offset, length);

        break;

    case OFPT_1_0_FLOW_REMOVED: /* 11 */

        dissect_openflow_flow_removed(tvb, pinfo, openflow_tree, offset, length);

        break;

    case OFPT_1_0_PACKET_OUT: /* 13 */

        dissect_openflow_pkt_out(tvb, pinfo, openflow_tree, offset, length);

        break;

    case OFPT_1_0_FLOW_MOD: /* 14 */

        dissect_openflow_flow_mod(tvb, pinfo, openflow_tree, offset, length);

        break;

    case OFPT_1_0_STATS_REQUEST: /* 16 */

        dissect_openflow_stats_req(tvb, pinfo, openflow_tree, offset, length);

        break;

    case OFPT_1_0_STATS_REPLY: /* 17 */

        dissect_openflow_stats_resp(tvb, pinfo, openflow_tree, offset, length);

        break;

    default:

        if(length>8){

            expert_add_info(pinfo, type_item, &ei_openflow_1_0_type);

        }

        break;

    }

    return tvb_reported_length(tvb);

}

/*

 * Register the protocol with Wireshark.

 */

void

proto_register_openflow_v1(void)

{

    static hf_register_info hf[] = {

        { &hf_openflow_version,

            { "Version", "openflow.version",

               FT_UINT8, BASE_HEX, VALS(openflow_version_values), 0x7f,

               NULL, HFILL }

        },

        { &hf_openflow_1_0_type,

            { "Type", "openflow_1_0.type",

               FT_UINT8, BASE_DEC | BASE_EXT_STRING, &openflow_1_0_type_values_ext, 0x0,

               NULL, HFILL }

        },

        { &hf_openflow_xid,

            { "Transaction ID", "openflow.xid",

               FT_UINT32, BASE_DEC, NULL, 0x0,

               NULL, HFILL }

        },

        { &hf_openflow_length,

            { "Length", "openflow.length",

               FT_UINT16, BASE_DEC, NULL, 0x0,

               NULL, HFILL }

        },

        { &hf_openflow_datapath_id,

            { "Datapath unique ID", "openflow.datapath_id",

               FT_UINT64, BASE_HEX, NULL, 0x0,

               NULL, HFILL }

        },

        { &hf_openflow_datapath_mac,

            { "MAC addr", "openflow.datapath_mac",

               FT_ETHER, BASE_NONE, NULL, 0x0,

               NULL, HFILL }

        },