1 /* 2 * This module implements printing of the very basic (version-independent) 3 * OpenFlow header and iteration over OpenFlow messages. It is intended for 4 * dispatching of version-specific OpenFlow message decoding. 5 * 6 * 7 * Copyright (c) 2013 The TCPDUMP project 8 * All rights reserved. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 20 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 21 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 22 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 23 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 25 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 26 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 27 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 29 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30 * POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 #include <sys/cdefs.h> 34 #ifndef lint 35 __RCSID("$NetBSD: print-openflow.c,v 1.2 2017/01/24 23:29:14 christos Exp $"); 36 #endif 37 38 #ifdef HAVE_CONFIG_H 39 #include "config.h" 40 #endif 41 42 #include <netdissect-stdinc.h> 43 44 #include "netdissect.h" 45 #include "extract.h" 46 #include "openflow.h" 47 #include "oui.h" 48 49 static const char tstr[] = " [|openflow]"; 50 51 #define OF_VER_1_0 0x01 52 53 const struct tok onf_exp_str[] = { 54 { ONF_EXP_ONF, "ONF Extensions" }, 55 { ONF_EXP_BUTE, "Budapest University of Technology and Economics" }, 56 { ONF_EXP_NOVIFLOW, "NoviFlow" }, 57 { ONF_EXP_L3, "L3+ Extensions, Vendor Neutral" }, 58 { ONF_EXP_L4L7, "L4-L7 Extensions" }, 59 { ONF_EXP_WMOB, "Wireless and Mobility Extensions" }, 60 { ONF_EXP_FABS, "Forwarding Abstractions Extensions" }, 61 { ONF_EXP_OTRANS, "Optical Transport Extensions" }, 62 { 0, NULL } 63 }; 64 65 const char * 66 of_vendor_name(const uint32_t vendor) 67 { 68 const struct tok *table = (vendor & 0xff000000) == 0 ? oui_values : onf_exp_str; 69 return tok2str(table, "unknown", vendor); 70 } 71 72 static void 73 of_header_print(netdissect_options *ndo, const uint8_t version, const uint8_t type, 74 const uint16_t length, const uint32_t xid) 75 { 76 ND_PRINT((ndo, "\n\tversion unknown (0x%02x), type 0x%02x, length %u, xid 0x%08x", 77 version, type, length, xid)); 78 } 79 80 /* Print a single OpenFlow message. */ 81 static const u_char * 82 of_header_body_print(netdissect_options *ndo, const u_char *cp, const u_char *ep) 83 { 84 uint8_t version, type; 85 uint16_t length; 86 uint32_t xid; 87 88 if (ep < cp + OF_HEADER_LEN) 89 goto invalid; 90 /* version */ 91 ND_TCHECK2(*cp, 1); 92 version = *cp; 93 cp += 1; 94 /* type */ 95 ND_TCHECK2(*cp, 1); 96 type = *cp; 97 cp += 1; 98 /* length */ 99 ND_TCHECK2(*cp, 2); 100 length = EXTRACT_16BITS(cp); 101 cp += 2; 102 /* xid */ 103 ND_TCHECK2(*cp, 4); 104 xid = EXTRACT_32BITS(cp); 105 cp += 4; 106 /* Message length includes the header length and a message always includes 107 * the basic header. A message length underrun fails decoding of the rest of 108 * the current packet. At the same time, try decoding as much of the current 109 * message as possible even when it does not end within the current TCP 110 * segment. */ 111 if (length < OF_HEADER_LEN) { 112 of_header_print(ndo, version, type, length, xid); 113 goto invalid; 114 } 115 /* Decode known protocol versions further without printing the header (the 116 * type decoding is version-specific. */ 117 switch (version) { 118 case OF_VER_1_0: 119 return of10_header_body_print(ndo, cp, ep, type, length, xid); 120 default: 121 of_header_print(ndo, version, type, length, xid); 122 ND_TCHECK2(*cp, length - OF_HEADER_LEN); 123 return cp + length - OF_HEADER_LEN; /* done with current message */ 124 } 125 126 invalid: /* fail current packet */ 127 ND_PRINT((ndo, "%s", istr)); 128 ND_TCHECK2(*cp, ep - cp); 129 return ep; 130 trunc: 131 ND_PRINT((ndo, "%s", tstr)); 132 return ep; 133 } 134 135 /* Print a TCP segment worth of OpenFlow messages presuming the segment begins 136 * on a message boundary. */ 137 void 138 openflow_print(netdissect_options *ndo, const u_char *cp, const u_int len) 139 { 140 const u_char *ep = cp + len; 141 142 ND_PRINT((ndo, ": OpenFlow")); 143 while (cp < ep) 144 cp = of_header_body_print(ndo, cp, ep); 145 } 146