Adding upstream version 4.2.2.upstream/4.2.2

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

1 files changed, 474 insertions, 0 deletions

diff --git a/epan/dissectors/packet-flip.c b/epan/dissectors/packet-flip.c
new file mode 100644
index 00000000..5df55d20
--- /dev/null
+++ b/epan/dissectors/packet-flip.c
@@ -0,0 +1,474 @@
+/* packet-flip.c
+ * Routines for FLIP packet dissection
+ *
+ * Copyright 2009, Juha Siltanen <juha.siltanen@nsn.com>
+ *
+ * Wireshark - Network traffic analyzer
+ * By Gerald Combs <gerald@wireshark.org>
+ * Copyright 1998 Gerald Combs
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+/*
+ * FLIP (Flow Layer Internal Protocol) is a proprietary protocol
+ * developed by Nokia Solutions and Networks (previous was 'Nokia Siemens Networks').
+ */
+
+/*
+ * Version information
+ *
+ * Version 0.0.1, November 23rd, 2009.
+ *
+ * Support for the basic and checksum headers.
+ *
+ * Version 0.0.2, August 26th, 2010.
+ *
+ * Support for payload dissecting.
+ *
+ * Version 0.0.3, September 14th, 2010.
+ *
+ * Bugfix: sorting by protocol didn't always fill in the protocol column.
+ */
+
+#include "config.h"
+
+#include <epan/packet.h>
+#include <epan/etypes.h>
+#include <epan/decode_as.h>
+#include <epan/in_cksum.h>
+
+#include <epan/prefs.h>
+
+#include <epan/rtp_pt.h>
+
+void proto_register_flip(void);
+void proto_reg_handoff_flip(void);
+
+static dissector_handle_t flip_handle;
+
+static int proto_flip = -1;
+
+/* BASIC */
+static int hf_flip_basic_e         = -1;
+static int hf_flip_basic_reserved  = -1;
+static int hf_flip_basic_flowid    = -1;
+static int hf_flip_basic_seqnum    = -1;
+static int hf_flip_basic_len       = -1;
+
+/* CHECKSUM */
+static int hf_flip_chksum_etype  = -1;
+static int hf_flip_chksum_spare  = -1;
+static int hf_flip_chksum_e      = -1;
+static int hf_flip_chksum_chksum = -1;
+
+#define FLIP_BASIC            (0)
+#define FLIP_CHKSUM           (1)
+
+#define FLIP_BASIC_HDR_LEN         (8)
+#define FLIP_CHKSUM_HDR_LEN        (4)
+#define FLIP_EXTENSION_HDR_MIN_LEN (4)
+
+static const value_string flip_etype[] = {
+    { FLIP_CHKSUM, "Checksum" },
+    { 0,           NULL }
+};
+
+static dissector_table_t subdissector_table;
+
+static gint ett_flip         = -1;
+static gint ett_flip_basic   = -1;
+static gint ett_flip_chksum  = -1;
+static gint ett_flip_payload = -1;
+
+static void flip_prompt(packet_info *pinfo _U_, gchar* result)
+{
+    snprintf(result, MAX_DECODE_AS_PROMPT_LEN, "Decode FLIP payload protocol as");
+}
+
+/* Dissect the checksum extension header. */
+static int
+dissect_flip_chksum_hdr(tvbuff_t    *tvb,
+                        packet_info *pinfo,
+                        proto_tree  *tree,
+                        guint16     computed_chksum,
+                        gboolean    *ext_hdr_follows_ptr)
+{
+    proto_tree *chksum_hdr_tree;
+    guint32  dw;
+    guint8   chksum_hdr_etype;
+    guint8   chksum_hdr_ext;
+    guint16  chksum_hdr_chksum;
+
+    gint bytes_dissected;
+    gint offset;
+
+    chksum_hdr_tree = NULL;
+
+    bytes_dissected = 0;
+    offset          = 0;
+
+    dw = tvb_get_ntohl(tvb, offset);
+    chksum_hdr_etype  = (guint8) ((dw & 0xFF000000) >> 24);
+    chksum_hdr_ext    = (guint8) ((dw & 0x00010000) >> 16);
+    chksum_hdr_chksum = (guint16) (dw & 0x0000FFFF);
+
+    /* The actually shouldn't be any headers after checksum. */
+    if (chksum_hdr_ext == 1) {
+        *ext_hdr_follows_ptr = TRUE;
+    }
+    else {
+        *ext_hdr_follows_ptr = FALSE;
+    }
+
+    if (tree) {
+        chksum_hdr_tree = proto_tree_add_subtree(tree, tvb, offset + 0, 4,
+                            ett_flip_chksum, NULL, "Checksum Header");
+
+        /* ETYPE: 8 bits */
+        proto_tree_add_uint_format_value(chksum_hdr_tree, hf_flip_chksum_etype,
+                                         tvb, offset + 0, 1, dw,
+                                         "%s", val_to_str_const(chksum_hdr_etype,
+                                                                flip_etype,
+                                                                "Unknown"));
+        /* SPARE: 7 bits */
+        proto_tree_add_item(chksum_hdr_tree, hf_flip_chksum_spare, tvb, offset, 4, ENC_BIG_ENDIAN);
+
+        /* EXT HDR: 1 bit */
+        proto_tree_add_item(chksum_hdr_tree, hf_flip_chksum_e,
+                                         tvb, offset, 4, ENC_BIG_ENDIAN);
+        /* CHKSUM: 16 bits. */
+        proto_tree_add_uint_format_value(
+            chksum_hdr_tree,
+            hf_flip_chksum_chksum,
+            tvb, offset + 2, 2,
+            chksum_hdr_chksum,
+            "0x%04x [%s] (computed 0x%04x)",
+            chksum_hdr_chksum,
+            ((chksum_hdr_chksum == computed_chksum) ? "Correct" : "Incorrect"),
+            computed_chksum);
+    }
+
+    /* Show faulty checksums. */
+    if (computed_chksum != chksum_hdr_chksum) {
+        col_add_fstr(pinfo->cinfo, COL_INFO,
+                     "Checksum 0x%04x [%s] (computed 0x%04x)",
+                     chksum_hdr_chksum,
+                     "Incorrect",
+                     computed_chksum);
+    }
+
+    bytes_dissected += FLIP_CHKSUM_HDR_LEN;
+
+    return bytes_dissected;
+
+} /* dissect_flip_chksum_hdr() */
+
+/* Protocol dissection */
+static int
+dissect_flip(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
+{
+    proto_item *ti = NULL;
+    proto_tree *flip_tree = NULL;
+    proto_tree *basic_hdr_tree = NULL;
+    tvbuff_t   *flip_tvb;
+
+    guint32 dw1;
+
+    /* Basic header fields. */
+    guint8   basic_hdr_ext;
+    guint32  basic_hdr_flow_id;
+    guint16  basic_hdr_len;
+
+    gboolean ext_hdr = FALSE;
+
+    gint bytes_dissected = 0;
+    gint payload_len;
+    gint frame_len;
+    gint flip_len;
+    gint offset = 0;
+
+    /* Error handling for basic header. */
+    gboolean is_faulty_frame = FALSE;
+
+    /* Show this protocol as FLIP. */
+    col_set_str(pinfo->cinfo, COL_PROTOCOL, "FLIP");
+
+    /*
+     * The frame can be faulty in several ways:
+     * - too short (even for the basic header)
+     * - length inconsistent (header and frame info different)
+     * - checksum doesn't check out
+     * - extension header is indicated, but the frame is too short for it
+     * - unknown extension header type
+     */
+
+    /* Check that there's enough data at least for the basic header. */
+    frame_len = tvb_captured_length(tvb);
+    if (frame_len < FLIP_BASIC_HDR_LEN) {
+        return 0;
+    }
+
+    bytes_dissected += FLIP_BASIC_HDR_LEN;
+
+    /* Process the first 32 bits of the basic header. */
+    dw1 = tvb_get_ntohl(tvb, offset + 0);
+    basic_hdr_ext      = ((dw1 & 0x80000000) >> 31);
+    basic_hdr_flow_id  = (dw1 & 0x0FFFFFFF);
+
+    /* Process the second 32 bits of the basic header. */
+    basic_hdr_len    = (guint16) (tvb_get_ntohl(tvb, offset + 4) & 0x0000FFFF);
+
+
+    /* Does the basic header indicate that an extension is next? */
+    if (basic_hdr_ext == 1) {
+        ext_hdr = TRUE;
+    }
+
+    flip_len = basic_hdr_len;
+
+    /*
+     * Check the length value.
+     */
+    if ((flip_len < FLIP_BASIC_HDR_LEN) || (flip_len > frame_len)) {
+        /* Faulty frame. Show the basic header anyway for debugging. */
+        is_faulty_frame = TRUE;
+    }
+
+    /* Fill in the info column. */
+    col_add_fstr(pinfo->cinfo, COL_INFO,
+                 "FlowID %s", val_to_str(basic_hdr_flow_id, NULL, "0x%08x"));
+
+    flip_tvb = tvb_new_subset_length(tvb, 0, frame_len);
+
+    /* We are asked for details. */
+    if (tree) {
+        ti = proto_tree_add_protocol_format(
+                tree, proto_flip, flip_tvb, 0, flip_len,
+                "NSN FLIP, FlowID %s",
+                val_to_str(basic_hdr_flow_id, NULL, "0x%08x"));
+        flip_tree = proto_item_add_subtree(ti, ett_flip);
+
+        /* basic header */
+        basic_hdr_tree = proto_tree_add_subtree(flip_tree, flip_tvb, offset, 8, ett_flip_basic, NULL, "Basic Header");
+
+        /* Extension header follows? 1 bit. */
+        proto_tree_add_item(basic_hdr_tree, hf_flip_basic_e, flip_tvb, offset, 4, ENC_BIG_ENDIAN);
+
+        /* Reserved: 3 bits. */
+        proto_tree_add_item(basic_hdr_tree, hf_flip_basic_reserved, flip_tvb, offset, 4, ENC_BIG_ENDIAN);
+
+        /* Flow ID: 28 bits. */
+        proto_tree_add_item(basic_hdr_tree, hf_flip_basic_flowid, flip_tvb, offset, 4, ENC_BIG_ENDIAN);
+
+        /* Sequence number: 16 bits. */
+        proto_tree_add_item(basic_hdr_tree, hf_flip_basic_seqnum, flip_tvb, offset + 4, 2, ENC_BIG_ENDIAN);
+
+        /* Packet length: 16 bits. */
+        proto_tree_add_item(basic_hdr_tree, hf_flip_basic_len, flip_tvb, offset + 6, 2, ENC_BIG_ENDIAN);
+    }
+
+    offset += FLIP_BASIC_HDR_LEN;
+
+    /*
+     * Process faults found when parsing the basic header.
+     */
+    if (is_faulty_frame == TRUE) {
+        if (flip_len > frame_len) {
+            col_add_fstr(pinfo->cinfo, COL_INFO,
+                         "Length mismatch: frame %d bytes, hdr %d bytes",
+                         frame_len, flip_len);
+        }
+        else if (flip_len < FLIP_BASIC_HDR_LEN) {
+            col_add_fstr(pinfo->cinfo, COL_INFO,
+                         "Invalid length in basic header: %d bytes", flip_len);
+        }
+
+        goto DISSECT_FLIP_EXIT;
+    }
+
+    /*
+     * Now we know that the basic header is sensible.
+     */
+    payload_len  = basic_hdr_len - FLIP_BASIC_HDR_LEN;
+
+    /*
+     * Dissect extension headers (if any).
+     */
+    if ((ext_hdr == TRUE) && (payload_len < FLIP_EXTENSION_HDR_MIN_LEN)) {
+        col_add_fstr(pinfo->cinfo, COL_INFO,
+                     "Extension header indicated, but not enough data");
+        goto DISSECT_FLIP_EXIT;
+    }
+
+    while ((ext_hdr == TRUE) && (payload_len >= FLIP_EXTENSION_HDR_MIN_LEN)) {
+        /* Detect the next header type. */
+        guint8  ext_hdr_type;
+        gint    bytes_handled;
+        guint16 computed_chksum;
+
+        tvbuff_t *chksum_tvb;
+
+        ext_hdr_type = tvb_get_guint8(flip_tvb, offset);
+
+        switch (ext_hdr_type) {
+        case FLIP_CHKSUM:
+            /* Calculate checksum, let the chksum dissector verify it. */
+            {
+                vec_t   vec[2];
+
+                SET_CKSUM_VEC_TVB(vec[0], flip_tvb, 0, bytes_dissected + 2);
+                SET_CKSUM_VEC_TVB(vec[1], flip_tvb, bytes_dissected + 4,
+                                  flip_len - (bytes_dissected + 4));
+                computed_chksum = in_cksum(&vec[0], 2);
+
+                /* Checksums handled in network order. */
+                computed_chksum = g_htons(computed_chksum);
+            }
+
+            chksum_tvb = tvb_new_subset_length(flip_tvb, offset,
+                                        FLIP_CHKSUM_HDR_LEN);
+
+            /* Note that flip_tree is NULL if no details are requested. */
+            bytes_handled = dissect_flip_chksum_hdr(chksum_tvb,
+                                                    pinfo,
+                                                    flip_tree,
+                                                    computed_chksum,
+                                                    &ext_hdr);
+            bytes_dissected += bytes_handled;
+            payload_len     -= bytes_handled;
+            offset          += bytes_handled;
+            break;
+
+        default:
+            /* Unknown header type. */
+            col_add_fstr(pinfo->cinfo, COL_INFO,
+                         "Invalid extension header type 0x%02x", ext_hdr_type);
+            goto DISSECT_FLIP_EXIT;
+            break;
+        }
+    }
+
+    /*
+     * Show payload (if any) as bytes.
+     */
+    if (payload_len > 0) {
+
+        tvbuff_t           *payload_tvb;
+        gint               data_len;
+
+        payload_tvb = tvb_new_subset_length(flip_tvb, offset, payload_len);
+
+        data_len = dissector_try_payload(subdissector_table, payload_tvb, pinfo, tree);
+        if (data_len <= 0)
+        {
+            data_len = call_data_dissector(payload_tvb, pinfo, tree);
+        }
+
+        bytes_dissected += data_len;
+
+    } /* if (payload_len > 0) */
+
+DISSECT_FLIP_EXIT:
+    return bytes_dissected;
+
+} /* dissect_flip() */
+
+
+/* Protocol initialization */
+void
+proto_register_flip(void)
+{
+    static hf_register_info hf[] = {
+        /*
+         * Basic header.
+         */
+        {&hf_flip_basic_e,
+         {"Extension Header Follows", "flip.basic.e", FT_BOOLEAN, 32,
+          TFS(&tfs_yes_no), 0x80000000, NULL, HFILL}
+        },
+        {&hf_flip_basic_reserved,
+         {"Reserved", "flip.basic.reserved", FT_UINT32, BASE_DEC,
+          NULL, 0x70000000, "Basic Header Reserved", HFILL}
+        },
+        {&hf_flip_basic_flowid,
+         {"FlowID", "flip.basic.flowid", FT_UINT32, BASE_HEX,
+          NULL, 0x0FFFFFFF, "Basic Header Flow ID", HFILL}
+        },
+        {&hf_flip_basic_seqnum,
+         {"Seqnum", "flip.basic.seqnum", FT_UINT16, BASE_DEC_HEX,
+          NULL, 0x0, "Basic Header Sequence Number", HFILL}
+        },
+        {&hf_flip_basic_len,
+         {"Len", "flip.basic.len", FT_UINT16, BASE_DEC_HEX,
+          NULL, 0x0, "Basic Header Packet Length", HFILL}
+        },
+        /*
+         * Checksum header.
+         */
+        {&hf_flip_chksum_etype,
+         {"Extension Type", "flip.chksum.etype", FT_UINT32, BASE_DEC,
+          VALS(flip_etype), 0xFF000000, "Checksum Header Extension Type", HFILL}
+        },
+        {&hf_flip_chksum_spare,
+         {"Spare", "flip.chksum.spare", FT_UINT32, BASE_DEC_HEX,
+          NULL, 0x00FE0000, "Checksum Header Spare", HFILL}
+        },
+        {&hf_flip_chksum_e,
+         {"Extension Header Follows", "flip.chksum.e", FT_BOOLEAN, 32,
+          TFS(&tfs_yes_no), 0x00010000, NULL, HFILL}
+        },
+        {&hf_flip_chksum_chksum,
+         {"Checksum", "flip.chksum.chksum", FT_UINT32, BASE_HEX,
+          NULL, 0x0000FFFF, NULL, HFILL}
+        }
+    };
+
+    static gint *ett[] = {
+        &ett_flip,
+        &ett_flip_basic,
+        &ett_flip_chksum,
+        &ett_flip_payload
+    };
+
+    module_t *flip_module;
+
+    proto_flip = proto_register_protocol("NSN FLIP", "FLIP", "flip");
+    flip_handle = register_dissector("flip", dissect_flip, proto_flip);
+
+    proto_register_field_array(proto_flip, hf, array_length(hf));
+    proto_register_subtree_array(ett, array_length(ett));
+
+    flip_module = prefs_register_protocol_obsolete(proto_flip);
+
+    /* Register preferences - now obsolete because of Decode As*/
+    prefs_register_obsolete_preference(flip_module, "decoding_mode");
+    prefs_register_obsolete_preference(flip_module, "heur_enabled_protocols");
+    prefs_register_obsolete_preference(flip_module, "heur_decode_rtp");
+    prefs_register_obsolete_preference(flip_module, "heur_decode_rtcp");
+    prefs_register_obsolete_preference(flip_module, "forced_protocol");
+    prefs_register_obsolete_preference(flip_module, "forced_decode");
+
+    subdissector_table = register_decode_as_next_proto(proto_flip, "flip.payload", "FLIP payload", flip_prompt);
+
+} /* proto_register_flip() */
+
+/* Protocol handoff */
+void
+proto_reg_handoff_flip(void)
+{
+    dissector_add_uint("ethertype", ETHERTYPE_FLIP, flip_handle);
+} /* proto_reg_handoff_flip() */
+
+/*
+ * 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:
+ */