Adding upstream version 4.2.2.upstream/4.2.2

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

1 files changed, 250 insertions, 0 deletions

diff --git a/epan/dissectors/packet-isis.c b/epan/dissectors/packet-isis.c
new file mode 100644
index 00000000..c872d747
--- /dev/null
+++ b/epan/dissectors/packet-isis.c
@@ -0,0 +1,250 @@
+/* packet-isis.c
+ * Routines for ISO/OSI network and transport protocol packet disassembly, core
+ * bits.
+ *
+ * Stuart Stanley <stuarts@mxmail.net>
+ *
+ * Wireshark - Network traffic analyzer
+ * By Gerald Combs <gerald@wireshark.org>
+ * Copyright 1998 Gerald Combs
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#include "config.h"
+
+#include <epan/packet.h>
+#include <epan/expert.h>
+#include <epan/nlpid.h>
+#include <epan/etypes.h>
+#include "packet-osi.h"
+#include "packet-isis.h"
+
+void proto_register_isis(void);
+void proto_reg_handoff_isis(void);
+
+static dissector_table_t isis_dissector_table;
+
+/* isis base header */
+static int proto_isis               = -1;
+
+static int hf_isis_irpd             = -1;
+static int hf_isis_header_length    = -1;
+static int hf_isis_version          = -1;
+static int hf_isis_system_id_length = -1;
+static int hf_isis_type             = -1;
+static int hf_isis_type_reserved    = -1;
+static int hf_isis_version2         = -1;
+static int hf_isis_reserved         = -1;
+static int hf_isis_max_area_adr     = -1;
+int hf_isis_clv_key_id              = -1;
+
+static gint ett_isis                = -1;
+
+static expert_field ei_isis_length_indicator_too_small = EI_INIT;
+static expert_field ei_isis_version = EI_INIT;
+static expert_field ei_isis_version2 = EI_INIT;
+static expert_field ei_isis_reserved = EI_INIT;
+static expert_field ei_isis_type = EI_INIT;
+
+static dissector_handle_t isis_handle;
+
+static const value_string isis_vals[] = {
+    { ISIS_TYPE_L1_HELLO,  "L1 HELLO"},
+    { ISIS_TYPE_L2_HELLO,  "L2 HELLO"},
+    { ISIS_TYPE_PTP_HELLO, "P2P HELLO"},
+    { ISIS_TYPE_L1_LSP,    "L1 LSP"},
+    { ISIS_TYPE_L2_LSP,    "L2 LSP"},
+    { ISIS_TYPE_L1_CSNP,   "L1 CSNP"},
+    { ISIS_TYPE_L2_CSNP,   "L2 CSNP"},
+    { ISIS_TYPE_L1_PSNP,   "L1 PSNP"},
+    { ISIS_TYPE_L2_PSNP,   "L2 PSNP"},
+    { 0,                   NULL}
+};
+
+static int
+dissect_isis(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
+{
+    proto_item *ti, *version_item, *version2_item, *reserved_item;
+    proto_tree *isis_tree = NULL;
+    int offset = 0;
+    guint8 isis_version, isis_version2, isis_reserved;
+    guint8 isis_type;
+    isis_data_t subdissector_data;
+
+    col_set_str(pinfo->cinfo, COL_PROTOCOL, "ISIS");
+    col_clear(pinfo->cinfo, COL_INFO);
+
+    ti = proto_tree_add_item(tree, proto_isis, tvb, 0, -1, ENC_NA);
+    isis_tree = proto_item_add_subtree(ti, ett_isis);
+
+    proto_tree_add_item(isis_tree, hf_isis_irpd, tvb, offset, 1, ENC_BIG_ENDIAN );
+    offset += 1;
+
+    subdissector_data.header_length = tvb_get_guint8(tvb, offset);
+    subdissector_data.header_length_item =
+        proto_tree_add_uint(isis_tree, hf_isis_header_length, tvb,
+            offset, 1, subdissector_data.header_length );
+    offset += 1;
+    if (subdissector_data.header_length < 8) {
+        /* Not large enough to include the part of the header that
+           we dissect here. */
+        expert_add_info(pinfo, subdissector_data.header_length_item, &ei_isis_length_indicator_too_small);
+        return tvb_captured_length(tvb);
+    }
+    subdissector_data.ei_bad_header_length = &ei_isis_length_indicator_too_small;
+
+    isis_version = tvb_get_guint8(tvb, offset);
+    version_item = proto_tree_add_uint(isis_tree, hf_isis_version, tvb,
+            offset, 1, isis_version );
+    if (isis_version != ISIS_REQUIRED_VERSION){
+        expert_add_info(pinfo, version_item, &ei_isis_version);
+    }
+    offset += 1;
+
+    subdissector_data.system_id_len = tvb_get_guint8(tvb, offset);
+    proto_tree_add_uint(isis_tree, hf_isis_system_id_length, tvb,
+            offset, 1, subdissector_data.system_id_len );
+    offset += 1;
+
+    proto_tree_add_item(isis_tree, hf_isis_type_reserved, tvb, offset, 1, ENC_BIG_ENDIAN );
+
+    isis_type = tvb_get_guint8(tvb, offset) & ISIS_TYPE_MASK;
+    col_add_str(pinfo->cinfo, COL_INFO,
+                val_to_str ( isis_type, isis_vals, "Unknown (0x%x)" ) );
+    proto_tree_add_item(isis_tree, hf_isis_type, tvb, offset, 1, ENC_BIG_ENDIAN );
+    offset += 1;
+
+    isis_version2 = tvb_get_guint8(tvb, offset);
+    version2_item = proto_tree_add_item(isis_tree, hf_isis_version2, tvb, offset, 1, ENC_BIG_ENDIAN );
+    if (isis_version2 != 1) {
+        expert_add_info(pinfo, version2_item, &ei_isis_version2);
+    }
+    offset += 1;
+
+    isis_reserved = tvb_get_guint8(tvb, offset);
+    reserved_item = proto_tree_add_item(isis_tree, hf_isis_reserved, tvb, offset, 1, ENC_BIG_ENDIAN );
+    if (isis_reserved != 0) {
+        expert_add_info(pinfo, reserved_item, &ei_isis_reserved);
+    }
+    offset += 1;
+
+    proto_tree_add_item(isis_tree, hf_isis_max_area_adr, tvb, offset, 1, ENC_BIG_ENDIAN );
+    offset += 1;
+
+    /*
+     * Interpret the system ID length.
+     */
+    if (subdissector_data.system_id_len == 0)
+        subdissector_data.system_id_len = 6;    /* zero means 6-octet ID field length */
+    else if (subdissector_data.system_id_len == 255) {
+        subdissector_data.system_id_len = 0;    /* 255 means null ID field */
+        /* XXX - what about the LAN ID? */
+    }
+    /* XXX - otherwise, must be in the range 1 through 8 */
+
+    /*
+     * We must pass the entire ISIS PDU to the dissector, as some
+     * dissectors are for ISIS PDU types that might contain a
+     * checksum TLV, and that checksum is over the entire PDU.
+     */
+    if (!dissector_try_uint_new(isis_dissector_table, isis_type, tvb,
+                                pinfo, tree, TRUE, &subdissector_data))
+    {
+        proto_tree_add_expert(tree, pinfo, &ei_isis_type, tvb, offset, -1);
+    }
+    return tvb_captured_length(tvb);
+} /* dissect_isis */
+
+void
+proto_register_isis(void)
+{
+  static hf_register_info hf[] = {
+    { &hf_isis_irpd,
+      { "Intradomain Routing Protocol Discriminator",    "isis.irpd",
+        FT_UINT8, BASE_HEX, VALS(nlpid_vals), 0x0, NULL, HFILL }},
+
+    { &hf_isis_header_length,
+      { "Length Indicator", "isis.len", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }},
+
+    { &hf_isis_version,
+      { "Version/Protocol ID Extension", "isis.version", FT_UINT8,
+         BASE_DEC, NULL, 0x0, NULL, HFILL }},
+
+    { &hf_isis_system_id_length,
+      { "ID Length", "isis.sysid_len",
+        FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }},
+
+    { &hf_isis_type,
+      { "PDU Type", "isis.type", FT_UINT8, BASE_DEC,
+        VALS(isis_vals), ISIS_TYPE_MASK, NULL, HFILL }},
+
+    { &hf_isis_type_reserved,
+      { "Reserved", "isis.type.reserved", FT_UINT8, BASE_HEX,
+        NULL, ISIS_TYPE_RESERVED_MASK, NULL, HFILL }},
+
+    { &hf_isis_version2,
+      { "Version", "isis.version2", FT_UINT8, BASE_DEC, NULL,
+        0x0, NULL, HFILL }},
+
+    { &hf_isis_reserved,
+      { "Reserved", "isis.reserved", FT_UINT8, BASE_DEC, NULL,
+        0x0, NULL, HFILL }},
+
+    { &hf_isis_max_area_adr,
+      { "Maximum Area Addresses", "isis.max_area_adr", FT_UINT8, BASE_DEC, NULL,
+        0x0, "Maximum Area Addresses, 0 means 3", HFILL }},
+
+    { &hf_isis_clv_key_id,
+      { "Key ID", "isis.clv.key_id", FT_UINT16, BASE_DEC, NULL,
+        0x0, NULL, HFILL }},
+  };
+    /*
+     * Note, we pull in the unknown CLV handler here, since it
+     * is used by all ISIS packet types.
+     */
+    static gint *ett[] = {
+      &ett_isis,
+    };
+
+    static ei_register_info ei[] = {
+        { &ei_isis_length_indicator_too_small, { "isis.length_indicator_too_small", PI_MALFORMED, PI_ERROR, "ISIS length indicator value smaller than the fixed length header size", EXPFILL }},
+        { &ei_isis_version, { "isis.version.unknown", PI_PROTOCOL, PI_WARN, "Unknown ISIS version", EXPFILL }},
+        { &ei_isis_version2, { "isis.version2.notone", PI_PROTOCOL, PI_WARN, "Version must be 1", EXPFILL }},
+        { &ei_isis_reserved, { "isis.reserved.notzero", PI_PROTOCOL, PI_WARN, "Reserved must be 0", EXPFILL }},
+        { &ei_isis_type, { "isis.type.unknown", PI_PROTOCOL, PI_WARN, "Unknown ISIS packet type", EXPFILL }},
+    };
+
+    expert_module_t* expert_isis;
+
+    proto_isis = proto_register_protocol(PROTO_STRING_ISIS, "ISIS", "isis");
+    proto_register_field_array(proto_isis, hf, array_length(hf));
+    proto_register_subtree_array(ett, array_length(ett));
+    expert_isis = expert_register_protocol(proto_isis);
+    expert_register_field_array(expert_isis, ei, array_length(ei));
+
+    isis_handle = register_dissector("isis", dissect_isis, proto_isis);
+
+    isis_dissector_table = register_dissector_table("isis.type",
+                                "ISIS Type", proto_isis, FT_UINT8, BASE_DEC);
+}
+
+void
+proto_reg_handoff_isis(void)
+{
+    dissector_add_uint("osinl.incl", NLPID_ISO10589_ISIS, isis_handle);
+    dissector_add_uint("ethertype", ETHERTYPE_L2ISIS, isis_handle);
+}
+
+/*
+ * Editor modelines  -  https://www.wireshark.org/tools/modelines.html
+ *
+ * Local variables:
+ * c-basic-offset: 4
+ * tab-width: 8
+ * indent-tabs-mode: nil
+ * End:
+ *
+ * vi: set shiftwidth=4 tabstop=8 expandtab:
+ * :indentSize=4:tabSize=8:noTabs=true:
+ */