Adding upstream version 4.99.4.upstream/4.99.4upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 207 insertions, 0 deletions

diff --git a/print-udld.c b/print-udld.c
new file mode 100644
index 0000000..aec1d9e
--- /dev/null
+++ b/print-udld.c
@@ -0,0 +1,207 @@
+/*
+ * Copyright (c) 1998-2007 The TCPDUMP project
+ *
+ * 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.
+ *
+ * Original code by Carles Kishimoto <carles.kishimoto@gmail.com>
+ */
+
+/* \summary: Cisco UniDirectional Link Detection (UDLD) protocol printer */
+
+/* specification: RFC 5171 */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include "netdissect-stdinc.h"
+
+#define ND_LONGJMP_FROM_TCHECK
+#include "netdissect.h"
+#include "extract.h"
+
+
+#define UDLD_HEADER_LEN			4
+#define UDLD_TLV_HEADER_LEN		4
+#define UDLD_DEVICE_ID_TLV		0x0001
+#define UDLD_PORT_ID_TLV		0x0002
+#define UDLD_ECHO_TLV			0x0003
+#define UDLD_MESSAGE_INTERVAL_TLV	0x0004
+#define UDLD_TIMEOUT_INTERVAL_TLV	0x0005
+#define UDLD_DEVICE_NAME_TLV		0x0006
+#define UDLD_SEQ_NUMBER_TLV		0x0007
+
+static const struct tok udld_tlv_values[] = {
+    { UDLD_DEVICE_ID_TLV, "Device-ID TLV"},
+    { UDLD_PORT_ID_TLV, "Port-ID TLV"},
+    { UDLD_ECHO_TLV, "Echo TLV"},
+    { UDLD_MESSAGE_INTERVAL_TLV, "Message Interval TLV"},
+    { UDLD_TIMEOUT_INTERVAL_TLV, "Timeout Interval TLV"},
+    { UDLD_DEVICE_NAME_TLV, "Device Name TLV"},
+    { UDLD_SEQ_NUMBER_TLV,"Sequence Number TLV"},
+    { 0, NULL}
+};
+
+static const struct tok udld_code_values[] = {
+    { 0x00, "Reserved"},
+    { 0x01, "Probe message"},
+    { 0x02, "Echo message"},
+    { 0x03, "Flush message"},
+    { 0, NULL}
+};
+
+static const struct tok udld_flags_bitmap_str[] = {
+    { 1U << 0, "RT"    },
+    { 1U << 1, "RSY"   },
+    { 1U << 2, "MBZ-2" },
+    { 1U << 3, "MBZ-3" },
+    { 1U << 4, "MBZ-4" },
+    { 1U << 5, "MBZ-5" },
+    { 1U << 6, "MBZ-6" },
+    { 1U << 7, "MBZ-7" },
+    { 0, NULL}
+};
+
+/*
+ * UDLD's Protocol Data Unit format:
+ *
+ *  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 | Opcode  |     Flags     |           Checksum            |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * |               List of TLVs (variable length list)             |
+ * |                              ...                              |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *
+ * TLV format:
+ *
+ *  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
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * |             TYPE              |            LENGTH             |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * |                             VALUE                             |
+ * |                              ...                              |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *
+ * LENGTH: Length in bytes of the Type, Length, and Value fields.
+ */
+
+#define	UDLD_EXTRACT_VERSION(x) (((x)&0xe0)>>5)
+#define	UDLD_EXTRACT_OPCODE(x) ((x)&0x1f)
+
+void
+udld_print(netdissect_options *ndo,
+           const u_char *tptr, u_int length)
+{
+    uint8_t ver, code, flags;
+
+    ndo->ndo_protocol = "udld";
+    if (length < UDLD_HEADER_LEN)
+        goto invalid;
+
+    ver = UDLD_EXTRACT_VERSION(GET_U_1(tptr));
+    code = UDLD_EXTRACT_OPCODE(GET_U_1(tptr));
+    tptr += 1;
+    length -= 1;
+
+    flags = GET_U_1(tptr);
+    tptr += 1;
+    length -= 1;
+
+    ND_PRINT("UDLDv%u, Code %s (%x), Flags [%s] (0x%02x), length %u",
+           ver,
+           tok2str(udld_code_values, "Reserved", code),
+           code,
+           bittok2str(udld_flags_bitmap_str, "none", flags),
+           flags,
+           length + 2);
+
+    /*
+     * In non-verbose mode, just print version and opcode type
+     */
+    if (ndo->ndo_vflag < 1) {
+        goto tcheck_remainder;
+    }
+
+    ND_PRINT("\n\tChecksum 0x%04x (unverified)", GET_BE_U_2(tptr));
+    tptr += 2;
+    length -= 2;
+
+    while (length) {
+        uint16_t type, len;
+
+        if (length < UDLD_TLV_HEADER_LEN)
+            goto invalid;
+
+	type = GET_BE_U_2(tptr);
+        tptr += 2;
+        length -= 2;
+
+        len  = GET_BE_U_2(tptr);
+        tptr += 2;
+        length -= 2;
+
+        ND_PRINT("\n\t%s (0x%04x) TLV, length %u",
+               tok2str(udld_tlv_values, "Unknown", type),
+               type, len);
+
+        /* infinite loop check */
+        if (len <= UDLD_TLV_HEADER_LEN)
+            goto invalid;
+
+        len -= UDLD_TLV_HEADER_LEN;
+        if (length < len)
+            goto invalid;
+
+        switch (type) {
+        case UDLD_DEVICE_ID_TLV:
+        case UDLD_PORT_ID_TLV:
+        case UDLD_DEVICE_NAME_TLV:
+            ND_PRINT(", ");
+            nd_printjnp(ndo, tptr, len);
+            break;
+
+        case UDLD_ECHO_TLV:
+            ND_PRINT(", ");
+            (void)nd_printn(ndo, tptr, len, NULL);
+            break;
+
+        case UDLD_MESSAGE_INTERVAL_TLV:
+        case UDLD_TIMEOUT_INTERVAL_TLV:
+            if (len != 1)
+                goto invalid;
+            ND_PRINT(", %us", (GET_U_1(tptr)));
+            break;
+
+        case UDLD_SEQ_NUMBER_TLV:
+            if (len != 4)
+                goto invalid;
+            ND_PRINT(", %u", GET_BE_U_4(tptr));
+            break;
+
+        default:
+            ND_TCHECK_LEN(tptr, len);
+            break;
+        }
+        tptr += len;
+        length -= len;
+    }
+
+    return;
+
+invalid:
+    nd_print_invalid(ndo);
+tcheck_remainder:
+    ND_TCHECK_LEN(tptr, length);
+}