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/*
* 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 */
#include <config.h>
#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);
}
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