summaryrefslogtreecommitdiffstats
path: root/print-geneve.c
diff options
context:
space:
mode:
Diffstat (limited to 'print-geneve.c')
-rw-r--r--print-geneve.c244
1 files changed, 244 insertions, 0 deletions
diff --git a/print-geneve.c b/print-geneve.c
new file mode 100644
index 0000000..0b7ff6e
--- /dev/null
+++ b/print-geneve.c
@@ -0,0 +1,244 @@
+/*
+ * Copyright (c) 2014 VMware, Inc. All Rights Reserved.
+ *
+ * Jesse Gross <jesse@nicira.com>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that: (1) source code
+ * distributions retain the above copyright notice and this paragraph
+ * in its entirety, and (2) distributions including binary code include
+ * the above copyright notice and this paragraph in its entirety in
+ * the documentation or other materials provided with the distribution.
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND
+ * WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT
+ * LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE.
+ */
+
+/* \summary: Generic Network Virtualization Encapsulation (Geneve) printer */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include "netdissect-stdinc.h"
+
+#include "netdissect.h"
+#include "extract.h"
+#include "ethertype.h"
+
+/*
+ * Geneve header, draft-ietf-nvo3-geneve
+ *
+ * 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
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * |Ver| Opt Len |O|C| Rsvd. | Protocol Type |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Virtual Network Identifier (VNI) | Reserved |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Variable Length Options |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *
+ * Options:
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Option Class | Type |R|R|R| Length |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Variable Option Data |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ */
+
+#define VER_SHIFT 6
+#define HDR_OPTS_LEN_MASK 0x3F
+
+#define FLAG_OAM (1 << 7)
+#define FLAG_CRITICAL (1 << 6)
+#define FLAG_R1 (1 << 5)
+#define FLAG_R2 (1 << 4)
+#define FLAG_R3 (1 << 3)
+#define FLAG_R4 (1 << 2)
+#define FLAG_R5 (1 << 1)
+#define FLAG_R6 (1 << 0)
+
+#define OPT_TYPE_CRITICAL (1 << 7)
+#define OPT_LEN_MASK 0x1F
+
+static const struct tok geneve_flag_values[] = {
+ { FLAG_OAM, "O" },
+ { FLAG_CRITICAL, "C" },
+ { FLAG_R1, "R1" },
+ { FLAG_R2, "R2" },
+ { FLAG_R3, "R3" },
+ { FLAG_R4, "R4" },
+ { FLAG_R5, "R5" },
+ { FLAG_R6, "R6" },
+ { 0, NULL }
+};
+
+static const char *
+format_opt_class(uint16_t opt_class)
+{
+ switch (opt_class) {
+ case 0x0100:
+ return "Linux";
+ case 0x0101:
+ return "Open vSwitch";
+ case 0x0102:
+ return "Open Virtual Networking (OVN)";
+ case 0x0103:
+ return "In-band Network Telemetry (INT)";
+ case 0x0104:
+ return "VMware";
+ default:
+ if (opt_class <= 0x00ff)
+ return "Standard";
+ else if (opt_class >= 0xfff0)
+ return "Experimental";
+ }
+
+ return "Unknown";
+}
+
+static void
+geneve_opts_print(netdissect_options *ndo, const u_char *bp, u_int len)
+{
+ const char *sep = "";
+
+ while (len > 0) {
+ uint16_t opt_class;
+ uint8_t opt_type;
+ uint8_t opt_len;
+
+ ND_PRINT("%s", sep);
+ sep = ", ";
+
+ opt_class = GET_BE_U_2(bp);
+ opt_type = GET_U_1(bp + 2);
+ opt_len = 4 + ((GET_U_1(bp + 3) & OPT_LEN_MASK) * 4);
+
+ ND_PRINT("class %s (0x%x) type 0x%x%s len %u",
+ format_opt_class(opt_class), opt_class, opt_type,
+ opt_type & OPT_TYPE_CRITICAL ? "(C)" : "", opt_len);
+
+ if (opt_len > len) {
+ ND_PRINT(" [bad length]");
+ return;
+ }
+
+ if (ndo->ndo_vflag > 1 && opt_len > 4) {
+ const uint32_t *data = (const uint32_t *)(bp + 4);
+ int i;
+
+ ND_PRINT(" data");
+
+ for (i = 4; i < opt_len; i += 4) {
+ ND_PRINT(" %08x", GET_BE_U_4(data));
+ data++;
+ }
+ }
+
+ bp += opt_len;
+ len -= opt_len;
+ }
+}
+
+void
+geneve_print(netdissect_options *ndo, const u_char *bp, u_int len)
+{
+ uint8_t ver_opt;
+ u_int version;
+ uint8_t flags;
+ uint16_t prot;
+ uint32_t vni;
+ uint8_t reserved;
+ u_int opts_len;
+
+ ndo->ndo_protocol = "geneve";
+ ND_PRINT("Geneve");
+
+ if (len < 8) {
+ ND_PRINT(" [length %u < 8]", len);
+ nd_print_invalid(ndo);
+ return;
+ }
+
+ ND_TCHECK_8(bp);
+
+ ver_opt = GET_U_1(bp);
+ bp += 1;
+ len -= 1;
+
+ version = ver_opt >> VER_SHIFT;
+ if (version != 0) {
+ ND_PRINT(" ERROR: unknown-version %u", version);
+ return;
+ }
+
+ flags = GET_U_1(bp);
+ bp += 1;
+ len -= 1;
+
+ prot = GET_BE_U_2(bp);
+ bp += 2;
+ len -= 2;
+
+ vni = GET_BE_U_3(bp);
+ bp += 3;
+ len -= 3;
+
+ reserved = GET_U_1(bp);
+ bp += 1;
+ len -= 1;
+
+ ND_PRINT(", Flags [%s]",
+ bittok2str_nosep(geneve_flag_values, "none", flags));
+ ND_PRINT(", vni 0x%x", vni);
+
+ if (reserved)
+ ND_PRINT(", rsvd 0x%x", reserved);
+
+ if (ndo->ndo_eflag)
+ ND_PRINT(", proto %s (0x%04x)",
+ tok2str(ethertype_values, "unknown", prot), prot);
+
+ opts_len = (ver_opt & HDR_OPTS_LEN_MASK) * 4;
+
+ if (len < opts_len) {
+ ND_PRINT(" truncated-geneve - %u bytes missing",
+ opts_len - len);
+ return;
+ }
+
+ ND_TCHECK_LEN(bp, opts_len);
+
+ if (opts_len > 0) {
+ ND_PRINT(", options [");
+
+ if (ndo->ndo_vflag)
+ geneve_opts_print(ndo, bp, opts_len);
+ else
+ ND_PRINT("%u bytes", opts_len);
+
+ ND_PRINT("]");
+ }
+
+ bp += opts_len;
+ len -= opts_len;
+
+ if (ndo->ndo_vflag < 1)
+ ND_PRINT(": ");
+ else
+ ND_PRINT("\n\t");
+
+ if (ethertype_print(ndo, prot, bp, len, ND_BYTES_AVAILABLE_AFTER(bp), NULL, NULL) == 0) {
+ if (prot == ETHERTYPE_TEB)
+ ether_print(ndo, bp, len, ND_BYTES_AVAILABLE_AFTER(bp), NULL, NULL);
+ else
+ ND_PRINT("geneve-proto-0x%x", prot);
+ }
+
+ return;
+
+trunc:
+ nd_print_trunc(ndo);
+}