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142 lines
4.8 KiB
142 lines
4.8 KiB
/* |
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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) |
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{ |
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const u_char *ep = cp + len; |
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ND_PRINT((ndo, ": OpenFlow")); |
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while (cp < ep) |
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cp = of_header_body_print(ndo, cp, ep); |
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}
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