tcpdump  4.99.1
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print-brcmtag.c
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1 /*
2  * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997
3  * The Regents of the University of California. All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that: (1) source code distributions
7  * retain the above copyright notice and this paragraph in its entirety, (2)
8  * distributions including binary code include the above copyright notice and
9  * this paragraph in its entirety in the documentation or other materials
10  * provided with the distribution, and (3) all advertising materials mentioning
11  * features or use of this software display the following acknowledgement:
12  * ``This product includes software developed by the University of California,
13  * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
14  * the University nor the names of its contributors may be used to endorse
15  * or promote products derived from this software without specific prior
16  * written permission.
17  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
18  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
19  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
20  */
21 
22 /* \summary: Broadcom Ethernet switches tag (4 bytes) printer */
23 
24 #ifdef HAVE_CONFIG_H
25 #include <config.h>
26 #endif
27 
28 #include "netdissect-stdinc.h"
29 
30 #define ND_LONGJMP_FROM_TCHECK
31 #include "netdissect.h"
32 #include "ethertype.h"
33 #include "addrtoname.h"
34 #include "extract.h"
35 
36 #define ETHER_TYPE_LEN 2
37 
38 #define BRCM_TAG_LEN 4
39 #define BRCM_OPCODE_SHIFT 5
40 #define BRCM_OPCODE_MASK 0x7
41 
42 /* Ingress fields */
43 #define BRCM_IG_TC_SHIFT 2
44 #define BRCM_IG_TC_MASK 0x7
45 #define BRCM_IG_TE_MASK 0x3
46 #define BRCM_IG_TS_SHIFT 7
47 #define BRCM_IG_DSTMAP_MASK 0x1ff
48 
49 /* Egress fields */
50 #define BRCM_EG_CID_MASK 0xff
51 #define BRCM_EG_RC_MASK 0xff
52 #define BRCM_EG_RC_RSVD (3 << 6)
53 #define BRCM_EG_RC_EXCEPTION (1 << 5)
54 #define BRCM_EG_RC_PROT_SNOOP (1 << 4)
55 #define BRCM_EG_RC_PROT_TERM (1 << 3)
56 #define BRCM_EG_RC_SWITCH (1 << 2)
57 #define BRCM_EG_RC_MAC_LEARN (1 << 1)
58 #define BRCM_EG_RC_MIRROR (1 << 0)
59 #define BRCM_EG_TC_SHIFT 5
60 #define BRCM_EG_TC_MASK 0x7
61 #define BRCM_EG_PID_MASK 0x1f
62 
63 static const struct tok brcm_tag_te_values[] = {
64  { 0, "None" },
65  { 1, "Untag" },
66  { 2, "Header"},
67  { 3, "Reserved" },
68  { 0, NULL }
69 };
70 
71 static const struct tok brcm_tag_rc_values[] = {
72  { 1, "mirror" },
73  { 2, "MAC learning" },
74  { 4, "switching" },
75  { 8, "prot term" },
76  { 16, "prot snoop" },
77  { 32, "exception" },
78  { 0, NULL }
79 };
80 
81 static void
82 brcm_tag_print(netdissect_options *ndo, const u_char *bp)
83 {
84  uint8_t tag[BRCM_TAG_LEN];
85  uint16_t dst_map;
86  unsigned int i;
87 
88  for (i = 0; i < BRCM_TAG_LEN; i++)
89  tag[i] = GET_U_1(bp + i);
90 
91  ND_PRINT("BRCM tag OP: %s", tag[0] ? "IG" : "EG");
92  if (tag[0] & (1 << BRCM_OPCODE_SHIFT)) {
93  /* Ingress Broadcom tag */
94  ND_PRINT(", TC: %d", (tag[1] >> BRCM_IG_TC_SHIFT) &
96  ND_PRINT(", TE: %s",
97  tok2str(brcm_tag_te_values, "unknown",
98  (tag[1] & BRCM_IG_TE_MASK)));
99  ND_PRINT(", TS: %d", tag[1] >> BRCM_IG_TS_SHIFT);
100  dst_map = (uint16_t)tag[2] << 8 | tag[3];
101  ND_PRINT(", DST map: 0x%04x", dst_map & BRCM_IG_DSTMAP_MASK);
102  } else {
103  /* Egress Broadcom tag */
104  ND_PRINT(", CID: %d", tag[1]);
105  ND_PRINT(", RC: %s", tok2str(brcm_tag_rc_values,
106  "reserved", tag[2]));
107  ND_PRINT(", TC: %d", (tag[3] >> BRCM_EG_TC_SHIFT) &
109  ND_PRINT(", port: %d", tag[3] & BRCM_EG_PID_MASK);
110  }
111  ND_PRINT(", ");
112 }
113 
114 void
115 brcm_tag_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h,
116  const u_char *p)
117 {
118  u_int caplen = h->caplen;
119  u_int length = h->len;
120 
121  ndo->ndo_protocol = "brcm-tag";
122  ndo->ndo_ll_hdr_len +=
123  ether_switch_tag_print(ndo, p, length, caplen,
125 }
126 
127 void
128 brcm_tag_prepend_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h,
129  const u_char *p)
130 {
131  u_int caplen = h->caplen;
132  u_int length = h->len;
133 
134  ndo->ndo_protocol = "brcm-tag-prepend";
137 
138  if (ndo->ndo_eflag) {
139  /* Print the prepended Broadcom tag. */
140  brcm_tag_print(ndo, p);
141  }
142  p += BRCM_TAG_LEN;
143  length -= BRCM_TAG_LEN;
144  caplen -= BRCM_TAG_LEN;
145 
146  /*
147  * Now print the Ethernet frame following it.
148  */
149  ndo->ndo_ll_hdr_len +=
150  ether_print(ndo, p, length, caplen, NULL, NULL);
151 }
#define GET_U_1(p)
Definition: extract.h:872
u_int ether_switch_tag_print(netdissect_options *, const u_char *, u_int, u_int, void(*)(netdissect_options *, const u_char *), u_int)
Definition: print-ether.c:418
#define ND_TCHECK_LEN(p, l)
Definition: netdissect.h:368
const char * tok2str(const struct tok *, const char *, u_int)
Definition: util-print.c:485
u_int ether_print(netdissect_options *, const u_char *, u_int, u_int, void(*)(netdissect_options *, const u_char *), const u_char *)
#define ND_PRINT(...)
Definition: netdissect.h:385
#define BRCM_OPCODE_SHIFT
Definition: print-brcmtag.c:39
static const struct tok brcm_tag_rc_values[]
Definition: print-brcmtag.c:71
static void brcm_tag_print(netdissect_options *ndo, const u_char *bp)
Definition: print-brcmtag.c:82
#define BRCM_IG_DSTMAP_MASK
Definition: print-brcmtag.c:47
#define BRCM_IG_TC_SHIFT
Definition: print-brcmtag.c:43
static const struct tok brcm_tag_te_values[]
Definition: print-brcmtag.c:63
#define BRCM_TAG_LEN
Definition: print-brcmtag.c:38
#define BRCM_IG_TC_MASK
Definition: print-brcmtag.c:44
#define BRCM_EG_PID_MASK
Definition: print-brcmtag.c:61
#define BRCM_EG_TC_MASK
Definition: print-brcmtag.c:60
#define BRCM_EG_TC_SHIFT
Definition: print-brcmtag.c:59
#define BRCM_IG_TS_SHIFT
Definition: print-brcmtag.c:46
void brcm_tag_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, const u_char *p)
void brcm_tag_prepend_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, const u_char *p)
#define BRCM_IG_TE_MASK
Definition: print-brcmtag.c:45
const char * ndo_protocol
Definition: netdissect.h:218