141 lines
4.8 KiB
C
141 lines
4.8 KiB
C
/*
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* This module implements printing of the very basic (version-independent)
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* OpenFlow header and iteration over OpenFlow messages. It is intended for
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* dispatching of version-specific OpenFlow message decoding.
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*
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*
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* Copyright (c) 2013 The TCPDUMP project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/* \summary: version-independent OpenFlow printer */
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <netdissect-stdinc.h>
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#include "netdissect.h"
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#include "extract.h"
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#include "openflow.h"
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#include "oui.h"
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static const char tstr[] = " [|openflow]";
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#define OF_VER_1_0 0x01
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const struct tok onf_exp_str[] = {
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{ ONF_EXP_ONF, "ONF Extensions" },
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{ ONF_EXP_BUTE, "Budapest University of Technology and Economics" },
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{ ONF_EXP_NOVIFLOW, "NoviFlow" },
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{ ONF_EXP_L3, "L3+ Extensions, Vendor Neutral" },
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{ ONF_EXP_L4L7, "L4-L7 Extensions" },
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{ ONF_EXP_WMOB, "Wireless and Mobility Extensions" },
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{ ONF_EXP_FABS, "Forwarding Abstractions Extensions" },
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{ ONF_EXP_OTRANS, "Optical Transport Extensions" },
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{ 0, NULL }
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};
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const char *
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of_vendor_name(const uint32_t vendor)
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{
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const struct tok *table = (vendor & 0xff000000) == 0 ? oui_values : onf_exp_str;
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return tok2str(table, "unknown", vendor);
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}
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static void
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of_header_print(netdissect_options *ndo, const uint8_t version, const uint8_t type,
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const uint16_t length, const uint32_t xid)
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{
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ND_PRINT((ndo, "\n\tversion unknown (0x%02x), type 0x%02x, length %u, xid 0x%08x",
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version, type, length, xid));
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}
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/* Print a single OpenFlow message. */
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static const u_char *
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of_header_body_print(netdissect_options *ndo, const u_char *cp, const u_char *ep)
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{
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uint8_t version, type;
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uint16_t length;
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uint32_t xid;
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if (ep < cp + OF_HEADER_LEN)
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goto invalid;
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/* version */
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ND_TCHECK2(*cp, 1);
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version = *cp;
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cp += 1;
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/* type */
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ND_TCHECK2(*cp, 1);
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type = *cp;
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cp += 1;
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/* length */
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ND_TCHECK2(*cp, 2);
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length = EXTRACT_16BITS(cp);
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cp += 2;
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/* xid */
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ND_TCHECK2(*cp, 4);
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xid = EXTRACT_32BITS(cp);
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cp += 4;
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/* Message length includes the header length and a message always includes
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* the basic header. A message length underrun fails decoding of the rest of
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* the current packet. At the same time, try decoding as much of the current
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* message as possible even when it does not end within the current TCP
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* segment. */
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if (length < OF_HEADER_LEN) {
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of_header_print(ndo, version, type, length, xid);
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goto invalid;
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}
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/* Decode known protocol versions further without printing the header (the
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* type decoding is version-specific. */
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switch (version) {
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case OF_VER_1_0:
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return of10_header_body_print(ndo, cp, ep, type, length, xid);
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default:
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of_header_print(ndo, version, type, length, xid);
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ND_TCHECK2(*cp, length - OF_HEADER_LEN);
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return cp + length - OF_HEADER_LEN; /* done with current message */
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}
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invalid: /* fail current packet */
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ND_PRINT((ndo, "%s", istr));
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ND_TCHECK2(*cp, ep - cp);
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return ep;
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trunc:
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ND_PRINT((ndo, "%s", tstr));
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return ep;
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}
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/* Print a TCP segment worth of OpenFlow messages presuming the segment begins
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* on a message boundary. */
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void
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openflow_print(netdissect_options *ndo, const u_char *cp, const u_int len _U_)
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{
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ND_PRINT((ndo, ": OpenFlow"));
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while (cp < ndo->ndo_snapend)
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cp = of_header_body_print(ndo, cp, ndo->ndo_snapend);
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}
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