2 * Copyright (c) 2014 VMware, Inc. All Rights Reserved.
4 * Jesse Gross <jesse@nicira.com>
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that: (1) source code
8 * distributions retain the above copyright notice and this paragraph
9 * in its entirety, and (2) distributions including binary code include
10 * the above copyright notice and this paragraph in its entirety in
11 * the documentation or other materials provided with the distribution.
12 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND
13 * WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT
14 * LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
15 * FOR A PARTICULAR PURPOSE.
18 /* \summary: Generic Network Virtualization Encapsulation (Geneve) printer */
24 #include <netdissect-stdinc.h>
26 #include "netdissect.h"
28 #include "ethertype.h"
31 * Geneve header, draft-ietf-nvo3-geneve
34 * 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
35 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
36 * |Ver| Opt Len |O|C| Rsvd. | Protocol Type |
37 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
38 * | Virtual Network Identifier (VNI) | Reserved |
39 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
40 * | Variable Length Options |
41 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
44 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
45 * | Option Class | Type |R|R|R| Length |
46 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
47 * | Variable Option Data |
48 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
52 #define HDR_OPTS_LEN_MASK 0x3F
54 #define FLAG_OAM (1 << 7)
55 #define FLAG_CRITICAL (1 << 6)
56 #define FLAG_R1 (1 << 5)
57 #define FLAG_R2 (1 << 4)
58 #define FLAG_R3 (1 << 3)
59 #define FLAG_R4 (1 << 2)
60 #define FLAG_R5 (1 << 1)
61 #define FLAG_R6 (1 << 0)
63 #define OPT_TYPE_CRITICAL (1 << 7)
64 #define OPT_LEN_MASK 0x1F
66 static const struct tok geneve_flag_values[] = {
68 { FLAG_CRITICAL, "C" },
79 format_opt_class(uint16_t opt_class)
85 return "Open vSwitch";
87 return "Open Virtual Networking (OVN)";
89 return "In-band Network Telemetry (INT)";
93 if (opt_class <= 0x00ff)
95 else if (opt_class >= 0xfff0)
96 return "Experimental";
103 geneve_opts_print(netdissect_options *ndo, const u_char *bp, u_int len)
105 const char *sep = "";
112 ND_PRINT((ndo, "%s", sep));
115 opt_class = EXTRACT_16BITS(bp);
116 opt_type = *(bp + 2);
117 opt_len = 4 + ((*(bp + 3) & OPT_LEN_MASK) * 4);
119 ND_PRINT((ndo, "class %s (0x%x) type 0x%x%s len %u",
120 format_opt_class(opt_class), opt_class, opt_type,
121 opt_type & OPT_TYPE_CRITICAL ? "(C)" : "", opt_len));
124 ND_PRINT((ndo, " [bad length]"));
128 if (ndo->ndo_vflag > 1 && opt_len > 4) {
129 const uint32_t *data = (const uint32_t *)(bp + 4);
132 ND_PRINT((ndo, " data"));
134 for (i = 4; i < opt_len; i += 4) {
135 ND_PRINT((ndo, " %08x", EXTRACT_32BITS(data)));
146 geneve_print(netdissect_options *ndo, const u_char *bp, u_int len)
156 ND_PRINT((ndo, "Geneve"));
164 version = ver_opt >> VER_SHIFT;
166 ND_PRINT((ndo, " ERROR: unknown-version %u", version));
174 prot = EXTRACT_16BITS(bp);
178 vni = EXTRACT_24BITS(bp);
186 ND_PRINT((ndo, ", Flags [%s]",
187 bittok2str_nosep(geneve_flag_values, "none", flags)));
188 ND_PRINT((ndo, ", vni 0x%x", vni));
191 ND_PRINT((ndo, ", rsvd 0x%x", reserved));
194 ND_PRINT((ndo, ", proto %s (0x%04x)",
195 tok2str(ethertype_values, "unknown", prot), prot));
197 opts_len = (ver_opt & HDR_OPTS_LEN_MASK) * 4;
199 if (len < opts_len) {
200 ND_PRINT((ndo, " truncated-geneve - %u bytes missing",
205 ND_TCHECK2(*bp, opts_len);
208 ND_PRINT((ndo, ", options ["));
211 geneve_opts_print(ndo, bp, opts_len);
213 ND_PRINT((ndo, "%u bytes", opts_len));
215 ND_PRINT((ndo, "]"));
221 if (ndo->ndo_vflag < 1)
222 ND_PRINT((ndo, ": "));
224 ND_PRINT((ndo, "\n\t"));
226 if (ethertype_print(ndo, prot, bp, len, ndo->ndo_snapend - bp, NULL, NULL) == 0) {
227 if (prot == ETHERTYPE_TEB)
228 ether_print(ndo, bp, len, ndo->ndo_snapend - bp, NULL, NULL);
230 ND_PRINT((ndo, "geneve-proto-0x%x", prot));
236 ND_PRINT((ndo, " [|geneve]"));