freebsd-dev/contrib/tcpdump/print-geneve.c
Gleb Smirnoff 3340d77368 Update tcpdump to 4.9.0.
It fixes many buffer overflow in different protocol parsers, but none of
them are critical, even in absense of Capsicum.

Security:	CVE-2016-7922, CVE-2016-7923, CVE-2016-7924, CVE-2016-7925
Security:	CVE-2016-7926, CVE-2016-7927, CVE-2016-7928, CVE-2016-7929
Security:	CVE-2016-7930, CVE-2016-7931, CVE-2016-7932, CVE-2016-7933
Security:	CVE-2016-7934, CVE-2016-7935, CVE-2016-7936, CVE-2016-7937
Security:	CVE-2016-7938, CVE-2016-7939, CVE-2016-7940, CVE-2016-7973
Security:	CVE-2016-7974, CVE-2016-7975, CVE-2016-7983, CVE-2016-7984
Security:	CVE-2016-7985, CVE-2016-7986, CVE-2016-7992, CVE-2016-7993
Security:	CVE-2016-8574, CVE-2016-8575, CVE-2017-5202, CVE-2017-5203
Security:	CVE-2017-5204, CVE-2017-5205, CVE-2017-5341, CVE-2017-5342
Security:	CVE-2017-5482, CVE-2017-5483, CVE-2017-5484, CVE-2017-5485
Security:	CVE-2017-5486
2017-02-01 20:26:42 +00:00

238 lines
6.1 KiB
C

/*
* 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((ndo, "%s", sep));
sep = ", ";
opt_class = EXTRACT_16BITS(bp);
opt_type = *(bp + 2);
opt_len = 4 + ((*(bp + 3) & OPT_LEN_MASK) * 4);
ND_PRINT((ndo, "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((ndo, " [bad length]"));
return;
}
if (ndo->ndo_vflag > 1 && opt_len > 4) {
const uint32_t *data = (const uint32_t *)(bp + 4);
int i;
ND_PRINT((ndo, " data"));
for (i = 4; i < opt_len; i += 4) {
ND_PRINT((ndo, " %08x", EXTRACT_32BITS(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;
ND_PRINT((ndo, "Geneve"));
ND_TCHECK2(*bp, 8);
ver_opt = *bp;
bp += 1;
len -= 1;
version = ver_opt >> VER_SHIFT;
if (version != 0) {
ND_PRINT((ndo, " ERROR: unknown-version %u", version));
return;
}
flags = *bp;
bp += 1;
len -= 1;
prot = EXTRACT_16BITS(bp);
bp += 2;
len -= 2;
vni = EXTRACT_24BITS(bp);
bp += 3;
len -= 3;
reserved = *bp;
bp += 1;
len -= 1;
ND_PRINT((ndo, ", Flags [%s]",
bittok2str_nosep(geneve_flag_values, "none", flags)));
ND_PRINT((ndo, ", vni 0x%x", vni));
if (reserved)
ND_PRINT((ndo, ", rsvd 0x%x", reserved));
if (ndo->ndo_eflag)
ND_PRINT((ndo, ", 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((ndo, " truncated-geneve - %u bytes missing",
opts_len - len));
return;
}
ND_TCHECK2(*bp, opts_len);
if (opts_len > 0) {
ND_PRINT((ndo, ", options ["));
if (ndo->ndo_vflag)
geneve_opts_print(ndo, bp, opts_len);
else
ND_PRINT((ndo, "%u bytes", opts_len));
ND_PRINT((ndo, "]"));
}
bp += opts_len;
len -= opts_len;
if (ndo->ndo_vflag < 1)
ND_PRINT((ndo, ": "));
else
ND_PRINT((ndo, "\n\t"));
if (ethertype_print(ndo, prot, bp, len, ndo->ndo_snapend - bp, NULL, NULL) == 0) {
if (prot == ETHERTYPE_TEB)
ether_print(ndo, bp, len, ndo->ndo_snapend - bp, NULL, NULL);
else
ND_PRINT((ndo, "geneve-proto-0x%x", prot));
}
return;
trunc:
ND_PRINT((ndo, " [|geneve]"));
}