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tcpdump/print-dsa.c
Tobias Waldekranz dde10e0366 DSA: Correctly determine VID 
The 4 MSBs of the VID is stored in the lower nibble of the tag's third
byte.

Previously the priority bits where folded into the VID space, e.g. a
packet with VID=1 and priority 6 was printed as having a VID of
1537 (0x601).

Add DSA test PCAPs with packets containing a high VID and non-zero
FPri values to make sure we catch any future regressions.

Signed-off-by: Tobias Waldekranz <tobias@waldekranz.com>
2021-10-05 22:52:00 +02:00

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/*
* Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997
* The Regents of the University of California. All rights reserved.
*
* 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, (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, and (3) all advertising materials mentioning
* features or use of this software display the following acknowledgement:
* ``This product includes software developed by the University of California,
* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
* the University nor the names of its contributors may be used to endorse
* or promote products derived from this software without specific prior
* written permission.
* 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: Marvell (Ethertype) Distributed Switch Architecture printer */
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "netdissect-stdinc.h"
#include "netdissect.h"
#include "ethertype.h"
#include "addrtoname.h"
#include "extract.h"
/*
* Format of (Ethertyped or not) DSA tagged frames:
*
* 7 6 5 4 3 2 1 0
* . . . . . . . . .
* 0 +---+---+---+---+---+---+---+---+
* | Ether Destination Address |
* +6 +---+---+---+---+---+---+---+---+
* | Ether Source Address |
* +6 +---+---+---+---+---+---+---+---+ +-
* | Prog. DSA Ether Type [15:8] | | (8-byte) EDSA Tag
* +1 +---+---+---+---+---+---+---+---+ | Contains a programmable Ether type,
* | Prog. DSA Ether Type [7:0] | | two reserved bytes (always 0),
* +1 +---+---+---+---+---+---+---+---+ | and a standard DSA tag.
* | Reserved (0x00 0x00) | |
* +2 +---+---+---+---+---+---+---+---+ | +-
* | Mode |b29| Src/Trg Dev | | | (4-byte) DSA Tag
* +1 +---+---+---+---+---+---+---+---+ | | Contains a DSA tag mode,
* |Src/Trg Port/Trunk |b18|b17|b16| | | source or target switch device,
* +1 +---+---+---+---+---+---+---+---+ | | source or target port or trunk,
* | PRI [2:0] |b12| VID [11:8] | | | and misc (IEEE and FPri) bits.
* +1 +---+---+---+---+---+---+---+---+ | |
* | VID [7:0] | | |
* +1 +---+---+---+---+---+---+---+---+ +- +-
* | Ether Length/Type |
* +2 +---+---+---+---+---+---+---+---+
* . . . . . . . . .
*
* Mode: Forward, To_CPU, From_CPU, To_Sniffer
* b29: (Source or Target) IEEE Tag Mode
* b18: Forward's Src_Is_Trunk, To_CPU's Code[2], To_Sniffer's Rx_Sniff
* b17: To_CPU's Code[1]
* b16: Original frame's CFI
* b12: To_CPU's Code[0]
*/
#define TOK(tag, byte, mask, shift) ((GET_U_1(&(((const u_char *) tag)[byte])) & (mask)) >> (shift))
#define DSA_LEN 4
#define DSA_MODE(tag) TOK(tag, 0, 0xc0, 6)
#define DSA_MODE_TO_CPU 0x0
#define DSA_MODE_FROM_CPU 0x1
#define DSA_MODE_TO_SNIFFER 0x2
#define DSA_MODE_FORWARD 0x3
#define DSA_TAGGED(tag) TOK(tag, 0, 0x20, 5)
#define DSA_DEV(tag) TOK(tag, 0, 0x1f, 0)
#define DSA_PORT(tag) TOK(tag, 1, 0xf8, 3)
#define DSA_TRUNK(tag) TOK(tag, 1, 0x04, 2)
#define DSA_RX_SNIFF(tag) TOK(tag, 1, 0x04, 2)
#define DSA_CFI(tag) TOK(tag, 1, 0x01, 0)
#define DSA_PRI(tag) TOK(tag, 2, 0xe0, 5)
#define DSA_VID(tag) ((u_short)((TOK(tag, 2, 0x0f, 0) << 8) | (TOK(tag, 3, 0xff, 0))))
#define DSA_CODE(tag) ((TOK(tag, 1, 0x06, 1) << 1) | TOK(tag, 2, 0x10, 4))
#define EDSA_LEN 8
static const struct tok dsa_mode_values[] = {
{ DSA_MODE_TO_CPU, "To CPU" },
{ DSA_MODE_FROM_CPU, "From CPU" },
{ DSA_MODE_TO_SNIFFER, "To Sniffer"},
{ DSA_MODE_FORWARD, "Forward" },
{ 0, NULL }
};
static const struct tok dsa_code_values[] = {
{ 0x0, "BPDU (MGMT) Trap" },
{ 0x1, "Frame2Reg" },
{ 0x2, "IGMP/MLD Trap" },
{ 0x3, "Policy Trap" },
{ 0x4, "ARP Mirror" },
{ 0x5, "Policy Mirror" },
{ 0, NULL }
};
static void
tag_common_print(netdissect_options *ndo, const u_char *p)
{
if (ndo->ndo_eflag) {
ND_PRINT("mode %s, ", tok2str(dsa_mode_values, "unknown", DSA_MODE(p)));
switch (DSA_MODE(p)) {
case DSA_MODE_FORWARD:
ND_PRINT("dev %u, %s %u, ", DSA_DEV(p),
DSA_TRUNK(p) ? "trunk" : "port", DSA_PORT(p));
break;
case DSA_MODE_FROM_CPU:
ND_PRINT("target dev %u, port %u, ",
DSA_DEV(p), DSA_PORT(p));
break;
case DSA_MODE_TO_CPU:
ND_PRINT("source dev %u, port %u, ",
DSA_DEV(p), DSA_PORT(p));
ND_PRINT("code %s, ",
tok2str(dsa_code_values, "reserved", DSA_CODE(p)));
break;
case DSA_MODE_TO_SNIFFER:
ND_PRINT("source dev %u, port %u, ",
DSA_DEV(p), DSA_PORT(p));
ND_PRINT("%s sniff, ",
DSA_RX_SNIFF(p) ? "ingress" : "egress");
break;
default:
break;
}
ND_PRINT("%s, ", DSA_TAGGED(p) ? "tagged" : "untagged");
ND_PRINT("%s", DSA_CFI(p) ? "CFI, " : "");
ND_PRINT("VID %u, ", DSA_VID(p));
ND_PRINT("FPri %u, ", DSA_PRI(p));
} else {
switch (DSA_MODE(p)) {
case DSA_MODE_FORWARD:
ND_PRINT("Forward %s %u.%u, ",
DSA_TRUNK(p) ? "trunk" : "port",
DSA_DEV(p), DSA_PORT(p));
break;
case DSA_MODE_FROM_CPU:
ND_PRINT("CPU > port %u.%u, ",
DSA_DEV(p), DSA_PORT(p));
break;
case DSA_MODE_TO_CPU:
ND_PRINT("port %u.%u > CPU, ",
DSA_DEV(p), DSA_PORT(p));
break;
case DSA_MODE_TO_SNIFFER:
ND_PRINT("port %u.%u > %s Sniffer, ",
DSA_DEV(p), DSA_PORT(p),
DSA_RX_SNIFF(p) ? "Rx" : "Tx");
break;
default:
break;
}
ND_PRINT("VLAN %u%c, ", DSA_VID(p), DSA_TAGGED(p) ? 't' : 'u');
}
}
static void
dsa_tag_print(netdissect_options *ndo, const u_char *bp)
{
if (ndo->ndo_eflag)
ND_PRINT("Marvell DSA ");
else
ND_PRINT("DSA ");
tag_common_print(ndo, bp);
}
static void
edsa_tag_print(netdissect_options *ndo, const u_char *bp)
{
const u_char *p = bp;
uint16_t edsa_etype;
edsa_etype = GET_BE_U_2(p);
if (ndo->ndo_eflag) {
ND_PRINT("Marvell EDSA ethertype 0x%04x (%s), ", edsa_etype,
tok2str(ethertype_values, "Unknown", edsa_etype));
ND_PRINT("rsvd %u %u, ", GET_U_1(p + 2), GET_U_1(p + 3));
} else
ND_PRINT("EDSA 0x%04x, ", edsa_etype);
p += 4;
tag_common_print(ndo, p);
}
void
dsa_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, const u_char *p)
{
u_int caplen = h->caplen;
u_int length = h->len;
ndo->ndo_protocol = "dsa";
ndo->ndo_ll_hdr_len +=
ether_switch_tag_print(ndo, p, length, caplen, dsa_tag_print, DSA_LEN);
}
void
edsa_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, const u_char *p)
{
u_int caplen = h->caplen;
u_int length = h->len;
ndo->ndo_protocol = "edsa";
ndo->ndo_ll_hdr_len +=
ether_switch_tag_print(ndo, p, length, caplen, edsa_tag_print, EDSA_LEN);
}
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