mirror of
https://github.com/the-tcpdump-group/tcpdump.git
synced 2024-11-24 02:23:27 +08:00
307 lines
7.7 KiB
C
307 lines
7.7 KiB
C
/*
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* Copyright (c) 2014 VMware, Inc. All Rights Reserved.
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*
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* Jesse Gross <jesse@nicira.com>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that: (1) source code
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* distributions retain the above copyright notice and this paragraph
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* in its entirety, and (2) distributions including binary code include
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* the above copyright notice and this paragraph in its entirety in
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* the documentation or other materials provided with the distribution.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND
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* WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT
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* LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE.
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*/
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/* \summary: Generic Network Virtualization Encapsulation (Geneve) printer */
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/* specification: RFC 8926 */
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include "netdissect-stdinc.h"
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#define ND_LONGJMP_FROM_TCHECK
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#include "netdissect.h"
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#include "extract.h"
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#include "ethertype.h"
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/*
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* Geneve header:
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*
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* 0 1 2 3
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* 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
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* |Ver| Opt Len |O|C| Rsvd. | Protocol Type |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Virtual Network Identifier (VNI) | Reserved |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | |
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* ~ Variable-Length Options ~
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* | |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*
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* Options:
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* 0 1 2 3
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* 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
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Option Class | Type |R|R|R| Length |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | |
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* ~ Variable-Length Option Data ~
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* | |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*/
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#define VER_SHIFT 6
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#define HDR_OPTS_LEN_MASK 0x3F
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#define FLAG_OAM (1 << 7)
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#define FLAG_CRITICAL (1 << 6)
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#define FLAG_R1 (1 << 5)
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#define FLAG_R2 (1 << 4)
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#define FLAG_R3 (1 << 3)
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#define FLAG_R4 (1 << 2)
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#define FLAG_R5 (1 << 1)
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#define FLAG_R6 (1 << 0)
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#define OPT_TYPE_CRITICAL (1 << 7)
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#define OPT_LEN_MASK 0x1F
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static const struct tok geneve_flag_values[] = {
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{ FLAG_OAM, "O" },
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{ FLAG_CRITICAL, "C" },
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{ FLAG_R1, "R1" },
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{ FLAG_R2, "R2" },
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{ FLAG_R3, "R3" },
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{ FLAG_R4, "R4" },
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{ FLAG_R5, "R5" },
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{ FLAG_R6, "R6" },
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{ 0, NULL }
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};
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static const char *
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format_opt_class(const uint16_t opt_class)
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{
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switch (opt_class) {
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case 0x0100:
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return "Linux";
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case 0x0101:
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return "Open vSwitch";
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case 0x0102:
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return "Open Virtual Networking (OVN)";
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case 0x0103:
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return "In-band Network Telemetry (INT)";
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case 0x0104:
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return "VMware";
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case 0x0105:
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case 0x0108:
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case 0x0109:
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case 0x010A:
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case 0x010B:
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case 0x010C:
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case 0x010D:
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case 0x010E:
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case 0x010F:
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case 0x0110:
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return "Amazon";
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case 0x0106:
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case 0x0130:
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case 0x0131:
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return "Cisco";
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case 0x0107:
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return "Oracle";
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case 0x0111:
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case 0x0112:
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case 0x0113:
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case 0x0114:
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case 0x0115:
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case 0x0116:
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case 0x0117:
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case 0x0118:
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return "IBM";
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case 0x0119:
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case 0x011A:
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case 0x011B:
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case 0x011C:
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case 0x011D:
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case 0x011E:
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case 0x011F:
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case 0x0120:
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case 0x0121:
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case 0x0122:
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case 0x0123:
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case 0x0124:
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case 0x0125:
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case 0x0126:
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case 0x0127:
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case 0x0128:
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return "Ericsson";
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case 0x0129:
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return "Oxide";
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case 0x0132:
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case 0x0133:
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case 0x0134:
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case 0x0135:
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return "Google";
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case 0x0136:
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return "InfoQuick";
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default:
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if (opt_class <= 0x00ff)
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return "Standard";
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else if (opt_class >= 0xfff0)
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return "Experimental";
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}
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return "Unknown";
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}
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static unsigned
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geneve_opts_print(netdissect_options *ndo, const u_char *bp, u_int len)
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{
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const char *sep = "";
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while (len > 0) {
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uint16_t opt_class;
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uint8_t opt_type;
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uint8_t opt_len;
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ND_ICHECKMSG_U("remaining options length", len, <, 4);
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ND_PRINT("%s", sep);
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sep = ", ";
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opt_class = GET_BE_U_2(bp);
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opt_type = GET_U_1(bp + 2);
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opt_len = 4 + ((GET_U_1(bp + 3) & OPT_LEN_MASK) * 4);
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ND_PRINT("class %s (0x%x) type 0x%x%s len %u",
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format_opt_class(opt_class), opt_class, opt_type,
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opt_type & OPT_TYPE_CRITICAL ? "(C)" : "", opt_len);
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if (opt_len > len) {
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ND_PRINT(" [bad length]");
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goto invalid;
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}
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if (ndo->ndo_vflag > 1 && opt_len > 4) {
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const uint32_t *data = (const uint32_t *)(bp + 4);
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int i;
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ND_PRINT(" data");
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for (i = 4; i < opt_len; i += 4) {
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ND_PRINT(" %08x", GET_BE_U_4(data));
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data++;
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}
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}
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bp += opt_len;
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len -= opt_len;
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}
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return 1;
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invalid:
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ND_TCHECK_LEN(bp, len);
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return 0;
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}
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void
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geneve_print(netdissect_options *ndo, const u_char *bp, u_int len)
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{
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uint8_t ver_opt;
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u_int version;
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uint8_t flags;
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uint16_t prot;
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uint32_t vni;
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uint8_t reserved;
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u_int opts_len;
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ndo->ndo_protocol = "geneve";
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ND_PRINT("Geneve");
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ND_ICHECK_U(len, <, 8);
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ver_opt = GET_U_1(bp);
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bp += 1;
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len -= 1;
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version = ver_opt >> VER_SHIFT;
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if (version != 0) {
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ND_PRINT(" ERROR: unknown-version %u", version);
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goto invalid;
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}
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flags = GET_U_1(bp);
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bp += 1;
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len -= 1;
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prot = GET_BE_U_2(bp);
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bp += 2;
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len -= 2;
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vni = GET_BE_U_3(bp);
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bp += 3;
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len -= 3;
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reserved = GET_U_1(bp);
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bp += 1;
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len -= 1;
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ND_PRINT(", Flags [%s]",
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bittok2str_nosep(geneve_flag_values, "none", flags));
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ND_PRINT(", vni 0x%x", vni);
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if (reserved)
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ND_PRINT(", rsvd 0x%x", reserved);
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if (ndo->ndo_eflag)
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ND_PRINT(", proto %s (0x%04x)",
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tok2str(ethertype_values, "unknown", prot), prot);
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opts_len = (ver_opt & HDR_OPTS_LEN_MASK) * 4;
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if (len < opts_len) {
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ND_PRINT(" (opts_len %u > %u", opts_len, len);
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goto invalid;
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}
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if (opts_len > 0) {
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ND_PRINT(", options [");
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if (ndo->ndo_vflag) {
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if (! geneve_opts_print(ndo, bp, opts_len))
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goto invalid;
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}
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else {
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ND_TCHECK_LEN(bp, opts_len);
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ND_PRINT("%u bytes", opts_len);
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}
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ND_PRINT("]");
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}
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bp += opts_len;
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len -= opts_len;
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if (ndo->ndo_vflag < 1)
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ND_PRINT(": ");
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else
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ND_PRINT("\n\t");
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if (ethertype_print(ndo, prot, bp, len, ND_BYTES_AVAILABLE_AFTER(bp), NULL, NULL) == 0) {
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if (prot == ETHERTYPE_TEB)
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ether_print(ndo, bp, len, ND_BYTES_AVAILABLE_AFTER(bp), NULL, NULL);
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else {
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ND_PRINT("geneve-proto-0x%x", prot);
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ND_TCHECK_LEN(bp, len);
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}
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}
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return;
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invalid:
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nd_print_invalid(ndo);
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}
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