diff options
Diffstat (limited to 'print-openflow.c')
| -rw-r--r-- | print-openflow.c | 142 |
1 files changed, 142 insertions, 0 deletions
diff --git a/print-openflow.c b/print-openflow.c new file mode 100644 index 0000000..043adc2 --- /dev/null +++ b/print-openflow.c @@ -0,0 +1,142 @@ +/* + * This module implements printing of the very basic (version-independent) + * OpenFlow header and iteration over OpenFlow messages. It is intended for + * dispatching of version-specific OpenFlow message decoding. + * + * + * Copyright (c) 2013 The TCPDUMP project + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; + * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER + * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN + * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + */ + +/* \summary: version-independent OpenFlow printer */ + +#ifdef HAVE_CONFIG_H +#include "config.h" +#endif + +#include <netdissect-stdinc.h> + +#include "netdissect.h" +#include "extract.h" +#include "openflow.h" +#include "oui.h" + +static const char tstr[] = " [|openflow]"; + +#define OF_VER_1_0 0x01 + +const struct tok onf_exp_str[] = { + { ONF_EXP_ONF, "ONF Extensions" }, + { ONF_EXP_BUTE, "Budapest University of Technology and Economics" }, + { ONF_EXP_NOVIFLOW, "NoviFlow" }, + { ONF_EXP_L3, "L3+ Extensions, Vendor Neutral" }, + { ONF_EXP_L4L7, "L4-L7 Extensions" }, + { ONF_EXP_WMOB, "Wireless and Mobility Extensions" }, + { ONF_EXP_FABS, "Forwarding Abstractions Extensions" }, + { ONF_EXP_OTRANS, "Optical Transport Extensions" }, + { 0, NULL } +}; + +const char * +of_vendor_name(const uint32_t vendor) +{ + const struct tok *table = (vendor & 0xff000000) == 0 ? oui_values : onf_exp_str; + return tok2str(table, "unknown", vendor); +} + +static void +of_header_print(netdissect_options *ndo, const uint8_t version, const uint8_t type, + const uint16_t length, const uint32_t xid) +{ + ND_PRINT((ndo, "\n\tversion unknown (0x%02x), type 0x%02x, length %u, xid 0x%08x", + version, type, length, xid)); +} + +/* Print a single OpenFlow message. */ +static const u_char * +of_header_body_print(netdissect_options *ndo, const u_char *cp, const u_char *ep) +{ + uint8_t version, type; + uint16_t length; + uint32_t xid; + + if (ep < cp + OF_HEADER_LEN) + goto invalid; + /* version */ + ND_TCHECK2(*cp, 1); + version = *cp; + cp += 1; + /* type */ + ND_TCHECK2(*cp, 1); + type = *cp; + cp += 1; + /* length */ + ND_TCHECK2(*cp, 2); + length = EXTRACT_16BITS(cp); + cp += 2; + /* xid */ + ND_TCHECK2(*cp, 4); + xid = EXTRACT_32BITS(cp); + cp += 4; + /* Message length includes the header length and a message always includes + * the basic header. A message length underrun fails decoding of the rest of + * the current packet. At the same time, try decoding as much of the current + * message as possible even when it does not end within the current TCP + * segment. */ + if (length < OF_HEADER_LEN) { + of_header_print(ndo, version, type, length, xid); + goto invalid; + } + /* Decode known protocol versions further without printing the header (the + * type decoding is version-specific. */ + switch (version) { + case OF_VER_1_0: + return of10_header_body_print(ndo, cp, ep, type, length, xid); + default: + of_header_print(ndo, version, type, length, xid); + ND_TCHECK2(*cp, length - OF_HEADER_LEN); + return cp + length - OF_HEADER_LEN; /* done with current message */ + } + +invalid: /* fail current packet */ + ND_PRINT((ndo, "%s", istr)); + ND_TCHECK2(*cp, ep - cp); + return ep; +trunc: + ND_PRINT((ndo, "%s", tstr)); + return ep; +} + +/* Print a TCP segment worth of OpenFlow messages presuming the segment begins + * on a message boundary. */ +void +openflow_print(netdissect_options *ndo, const u_char *cp, const u_int len) +{ + const u_char *ep = cp + len; + + ND_PRINT((ndo, ": OpenFlow")); + while (cp < ep) + cp = of_header_body_print(ndo, cp, ep); +} |