summaryrefslogtreecommitdiffstats
path: root/print-vxlan-gpe.c
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--print-vxlan-gpe.c124
1 files changed, 124 insertions, 0 deletions
diff --git a/print-vxlan-gpe.c b/print-vxlan-gpe.c
new file mode 100644
index 0000000..13cba42
--- /dev/null
+++ b/print-vxlan-gpe.c
@@ -0,0 +1,124 @@
+/* Copyright (c) 2015, bugyo
+ * 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 OWNER 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: Generic Protocol Extension for VXLAN (VXLAN GPE) printer */
+
+/* specification: draft-ietf-nvo3-vxlan-gpe-10 */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include "netdissect-stdinc.h"
+
+#define ND_LONGJMP_FROM_TCHECK
+#include "netdissect.h"
+#include "extract.h"
+
+static const struct tok vxlan_gpe_flags [] = {
+ { 0x08, "I" },
+ { 0x04, "P" },
+ { 0x02, "B" },
+ { 0x01, "O" },
+ { 0, NULL }
+};
+
+#define VXLAN_GPE_HDR_LEN 8
+
+/*
+ * VXLAN GPE header, draft-ietf-nvo3-vxlan-gpe-01
+ * Generic Protocol Extension for VXLAN
+ *
+ * 0 1 2 3
+ * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * |R|R|Ver|I|P|R|O| Reserved |Next Protocol |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | VXLAN Network Identifier (VNI) | Reserved |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ */
+
+void
+vxlan_gpe_print(netdissect_options *ndo, const u_char *bp, u_int len)
+{
+ uint8_t flags;
+ uint8_t next_protocol;
+ uint32_t vni;
+
+ ndo->ndo_protocol = "vxlan_gpe";
+ ND_PRINT("VXLAN-GPE, ");
+ if (len < VXLAN_GPE_HDR_LEN) {
+ ND_PRINT(" (len %u < %u)", len, VXLAN_GPE_HDR_LEN);
+ goto invalid;
+ }
+
+ flags = GET_U_1(bp);
+ bp += 1;
+ len -= 1;
+ ND_PRINT("flags [%s], ",
+ bittok2str_nosep(vxlan_gpe_flags, "none", flags));
+
+ /* Reserved */
+ bp += 2;
+ len -= 2;
+
+ next_protocol = GET_U_1(bp);
+ bp += 1;
+ len -= 1;
+
+ vni = GET_BE_U_3(bp);
+ bp += 3;
+ len -= 3;
+
+ /* Reserved */
+ ND_TCHECK_1(bp);
+ bp += 1;
+ len -= 1;
+
+ ND_PRINT("vni %u", vni);
+ ND_PRINT(ndo->ndo_vflag ? "\n " : ": ");
+
+ switch (next_protocol) {
+ case 0x1:
+ ip_print(ndo, bp, len);
+ break;
+ case 0x2:
+ ip6_print(ndo, bp, len);
+ break;
+ case 0x3:
+ ether_print(ndo, bp, len, ND_BYTES_AVAILABLE_AFTER(bp), NULL, NULL);
+ break;
+ case 0x4:
+ nsh_print(ndo, bp, len);
+ break;
+ default:
+ ND_PRINT("ERROR: unknown-next-protocol");
+ goto invalid;
+ }
+
+ return;
+
+invalid:
+ nd_print_invalid(ndo);
+}
+