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+/*
+ * 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"
+
+#define ND_LONGJMP_FROM_TCHECK
+#include "netdissect.h"
+#include "extract.h"
+#include "openflow.h"
+#include "oui.h"
+
+
+static const struct tok ofver_str[] = {
+ { OF_VER_1_0, "1.0" },
+ { OF_VER_1_1, "1.1" },
+ { OF_VER_1_2, "1.2" },
+ { OF_VER_1_3, "1.3" },
+ { OF_VER_1_4, "1.4" },
+ { OF_VER_1_5, "1.5" },
+ { 0, NULL }
+};
+
+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" },
+ { ONF_EXP_NBLNCTU, "Network Benchmarking Lab, NCTU" },
+ { ONF_EXP_MPCE, "Mobile Packet Core Extensions" },
+ { ONF_EXP_MPLSTPSPTN, "MPLS-TP OpenFlow Extensions for SPTN" },
+ { 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);
+}
+
+void
+of_bitmap_print(netdissect_options *ndo,
+ const struct tok *t, const uint32_t v, const uint32_t u)
+{
+ /* Assigned bits? */
+ if (v & ~u)
+ ND_PRINT(" (%s)", bittok2str(t, "", v));
+ /* Unassigned bits? */
+ if (v & u)
+ ND_PRINT(" (bogus)");
+}
+
+void
+of_data_print(netdissect_options *ndo,
+ const u_char *cp, const u_int len)
+{
+ if (len == 0)
+ return;
+ /* data */
+ ND_PRINT("\n\t data (%u octets)", len);
+ if (ndo->ndo_vflag >= 2)
+ hex_and_ascii_print(ndo, "\n\t ", cp, len);
+ else
+ ND_TCHECK_LEN(cp, len);
+}
+
+static void
+of_message_print(netdissect_options *ndo,
+ const u_char *cp, uint16_t len,
+ const struct of_msgtypeinfo *mti)
+{
+ /*
+ * Here "cp" and "len" stand for the message part beyond the common
+ * OpenFlow 1.0 header, if any.
+ *
+ * Most message types are longer than just the header, and the length
+ * constraints may be complex. When possible, validate the constraint
+ * completely here (REQ_FIXLEN), otherwise check that the message is
+ * long enough to begin the decoding (REQ_MINLEN) and have the
+ * type-specific function do any remaining validation.
+ */
+
+ if (!mti)
+ goto tcheck_remainder;
+
+ if ((mti->req_what == REQ_FIXLEN && len != mti->req_value) ||
+ (mti->req_what == REQ_MINLEN && len < mti->req_value))
+ goto invalid;
+
+ if (!ndo->ndo_vflag || !mti->decoder)
+ goto tcheck_remainder;
+
+ mti->decoder(ndo, cp, len);
+ return;
+
+invalid:
+ nd_print_invalid(ndo);
+tcheck_remainder:
+ ND_TCHECK_LEN(cp, len);
+}
+
+/* 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, u_int len)
+{
+ ndo->ndo_protocol = "openflow";
+ ND_PRINT(": OpenFlow");
+ while (len) {
+ /* Print a single OpenFlow message. */
+ uint8_t version, type;
+ uint16_t length;
+ const struct of_msgtypeinfo *mti;
+
+ /* version */
+ version = GET_U_1(cp);
+ OF_FWD(1);
+ ND_PRINT("\n\tversion %s",
+ tok2str(ofver_str, "unknown (0x%02x)", version));
+ /* type */
+ if (len < 1)
+ goto partial_header;
+ type = GET_U_1(cp);
+ OF_FWD(1);
+ mti =
+ version == OF_VER_1_0 ? of10_identify_msgtype(type) :
+ version == OF_VER_1_3 ? of13_identify_msgtype(type) :
+ NULL;
+ if (mti && mti->name)
+ ND_PRINT(", type %s", mti->name);
+ else
+ ND_PRINT(", type unknown (0x%02x)", type);
+ /* length */
+ if (len < 2)
+ goto partial_header;
+ length = GET_BE_U_2(cp);
+ OF_FWD(2);
+ ND_PRINT(", length %u%s", length,
+ length < OF_HEADER_FIXLEN ? " (too short!)" : "");
+ /* xid */
+ if (len < 4)
+ goto partial_header;
+ ND_PRINT(", xid 0x%08x", GET_BE_U_4(cp));
+ OF_FWD(4);
+
+ /*
+ * When a TCP packet can contain several protocol messages,
+ * and at the same time a protocol message can span several
+ * TCP packets, decoding an incomplete message at the end of
+ * a TCP packet requires attention to detail in this loop.
+ *
+ * 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.
+ *
+ * Specifically, to try to process the message body in this
+ * iteration do NOT require the header "length" to be small
+ * enough for the full declared OpenFlow message to fit into
+ * the remainder of the declared TCP segment, same as the full
+ * declared TCP segment is not required to fit into the
+ * captured packet buffer.
+ *
+ * But DO require the same at the end of this iteration to
+ * decrement "len" and to proceed to the next iteration.
+ * (Ideally the declared TCP payload end will be at or after
+ * the captured packet buffer end, but stay safe even when
+ * that's somehow not the case.)
+ */
+ if (length < OF_HEADER_FIXLEN)
+ goto invalid;
+
+ of_message_print(ndo, cp, length - OF_HEADER_FIXLEN, mti);
+ if (length - OF_HEADER_FIXLEN > len)
+ break;
+ OF_FWD(length - OF_HEADER_FIXLEN);
+ } /* while (len) */
+ return;
+
+partial_header:
+ ND_PRINT(" (end of TCP payload)");
+ ND_TCHECK_LEN(cp, len);
+ return;
+invalid: /* fail the current packet */
+ nd_print_invalid(ndo);
+ ND_TCHECK_LEN(cp, len);
+}