Adding upstream version 4.2.2.upstream/4.2.2

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

1 files changed, 271 insertions, 0 deletions

diff --git a/epan/dissectors/packet-hdmi.c b/epan/dissectors/packet-hdmi.c
new file mode 100644
index 0000000..366e798
--- /dev/null
+++ b/epan/dissectors/packet-hdmi.c
@@ -0,0 +1,271 @@
+/* packet-hdmi.c
+ * Routines for HDMI dissection
+ * Copyright 2014 Martin Kaiser <martin@kaiser.cx>
+ *
+ * Wireshark - Network traffic analyzer
+ * By Gerald Combs <gerald@wireshark.org>
+ * Copyright 1998 Gerald Combs
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+/* this dissector handles I2C messages on the HDMI Display Data Channel (DDC)
+ *
+ * EDID (Extended Display Identification Data) messages are dissected here,
+ * HDCP messages are passed on to the HDCP dissector
+ */
+
+#include "config.h"
+
+#include <epan/packet.h>
+
+void proto_register_hdmi(void);
+void proto_reg_handoff_hdmi(void);
+
+static int proto_hdmi  = -1;
+
+static dissector_handle_t hdmi_handle;
+static dissector_handle_t hdcp_handle;
+
+static gint ett_hdmi = -1;
+static gint ett_hdmi_edid = -1;
+
+static int hf_hdmi_addr = -1;
+static int hf_hdmi_edid_offset = -1;
+static int hf_hdmi_edid_hdr = -1;
+static int hf_hdmi_edid_manf_id = -1;
+static int hf_hdmi_edid_manf_prod_code = -1;
+static int hf_hdmi_edid_manf_serial = -1;
+static int hf_hdmi_edid_manf_week = -1;
+static int hf_hdmi_edid_mod_year = -1;
+static int hf_hdmi_edid_manf_year = -1;
+static int hf_hdmi_edid_version = -1;
+
+
+/* also called Source and Sink in the HDMI spec */
+#define ADDR_TRX "Transmitter"
+#define ADDR_RCV "Receiver"
+
+/* we use 8bit I2C addresses, including the direction bit */
+#define ADDR8_HDCP_WRITE 0x74  /* transmitter->receiver */
+#define ADDR8_HDCP_READ  0x75  /* r->t */
+#define ADDR8_EDID_WRITE 0xA0  /* t->r */
+#define ADDR8_EDID_READ  0xA1  /* r->t */
+
+#define HDCP_ADDR8(x)   (x == ADDR8_HDCP_WRITE || x == ADDR8_HDCP_READ)
+
+static const value_string hdmi_addr[] = {
+    { ADDR8_HDCP_WRITE, "transmitter writes HDCP data for receiver" },
+    { ADDR8_HDCP_READ,  "transmitter reads HDCP data from receiver" },
+
+    { ADDR8_EDID_WRITE, "EDID request" },
+    { ADDR8_EDID_READ,  "EDID read" },
+    { 0, NULL }
+};
+
+#define EDID_HDR_VALUE G_GUINT64_CONSTANT(0x00ffffffffffff00)
+
+/* grab 5 bits, from bit n to n+4, from a big-endian number x
+   map those bits to a capital letter such that A == 1, B == 2, ... */
+#define CAPITAL_LETTER(x, n) ('A'-1 + (((x) & (0x1F<<n)) >> n))
+
+
+/* dissect EDID data from the receiver
+   return the offset after the dissected data */
+static gint
+dissect_hdmi_edid(tvbuff_t *tvb, gint offset, packet_info *pinfo, proto_tree *tree)
+{
+    proto_item *yi;
+    proto_tree *edid_tree;
+    guint64     edid_hdr;
+    guint16     manf_id;
+    gchar       manf_id_str[4]; /* 3 letters + 0-termination */
+    guint8      week, year;
+    int         year_hf;
+
+    edid_tree = proto_tree_add_subtree(tree, tvb,
+            offset, -1, ett_hdmi_edid, NULL,
+            "Extended Display Identification Data (EDID)");
+
+    edid_hdr = tvb_get_ntoh64(tvb, offset);
+    if (edid_hdr != EDID_HDR_VALUE)
+        return offset; /* XXX handle fragmented EDID messages */
+
+    col_append_sep_str(pinfo->cinfo, COL_INFO, NULL, "EDID");
+
+    proto_tree_add_item(edid_tree, hf_hdmi_edid_hdr,
+            tvb, offset, 8, ENC_LITTLE_ENDIAN);
+    offset += 8;
+
+    /* read as big endian for easier splitting */
+    manf_id = tvb_get_ntohs(tvb, offset);
+    /* XXX check that MSB is 0 */
+    manf_id_str[0] = CAPITAL_LETTER(manf_id, 10);
+    manf_id_str[1] = CAPITAL_LETTER(manf_id,  5);
+    manf_id_str[2] = CAPITAL_LETTER(manf_id,  0);
+    manf_id_str[3] = 0;
+    proto_tree_add_string(edid_tree, hf_hdmi_edid_manf_id,
+            tvb, offset, 2, manf_id_str);
+    offset += 2;
+
+    proto_tree_add_item(edid_tree, hf_hdmi_edid_manf_prod_code,
+            tvb, offset, 2, ENC_LITTLE_ENDIAN);
+    offset += 2;
+
+    proto_tree_add_item(edid_tree, hf_hdmi_edid_manf_serial,
+            tvb, offset, 4, ENC_LITTLE_ENDIAN);
+    offset += 4;
+
+    week = tvb_get_guint8(tvb, offset);
+    proto_tree_add_item(edid_tree, hf_hdmi_edid_manf_week,
+            tvb, offset, 1, ENC_LITTLE_ENDIAN);
+    offset += 1;
+
+    year_hf = week == 255 ? hf_hdmi_edid_mod_year : hf_hdmi_edid_manf_year;
+    year = tvb_get_guint8(tvb, offset);
+    yi = proto_tree_add_item(edid_tree, year_hf,
+            tvb, offset, 1, ENC_LITTLE_ENDIAN);
+    proto_item_append_text(yi, " (year %d)", 1990+year);
+    offset += 1;
+
+    proto_tree_add_item(edid_tree, hf_hdmi_edid_version, tvb, offset, 2, ENC_BIG_ENDIAN);
+
+    /* XXX dissect the parts following the EDID header */
+
+    return tvb_reported_length(tvb);
+}
+
+
+static int
+dissect_hdmi(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
+{
+    guint8      addr;
+    gint        offset=0;
+    proto_item *pi;
+    proto_tree *hdmi_tree;
+
+    /* the I2C address in the first byte is always handled by the HDMI
+       dissector, even if the packet contains HDCP data */
+    addr = tvb_get_guint8(tvb, 0);
+    if (!try_val_to_str(addr, hdmi_addr))
+        return 0; /* no HDMI packet */
+
+    col_set_str(pinfo->cinfo, COL_PROTOCOL, "HDMI");
+    col_clear(pinfo->cinfo, COL_INFO);
+
+    pi = proto_tree_add_item(tree, proto_hdmi, tvb, 0, -1, ENC_NA);
+    hdmi_tree = proto_item_add_subtree(pi, ett_hdmi);
+
+    if (addr&0x01) {
+        set_address(&pinfo->src, AT_STRINGZ, (int)strlen(ADDR_RCV)+1, ADDR_RCV);
+        set_address(&pinfo->dst, AT_STRINGZ, (int)strlen(ADDR_TRX)+1, ADDR_TRX);
+        pinfo->p2p_dir = P2P_DIR_RECV;
+    }
+    else {
+        set_address(&pinfo->src, AT_STRINGZ, (int)strlen(ADDR_TRX)+1, ADDR_TRX);
+        set_address(&pinfo->dst, AT_STRINGZ, (int)strlen(ADDR_RCV)+1, ADDR_RCV);
+        pinfo->p2p_dir = P2P_DIR_SENT;
+    }
+
+    /* there's no explicit statement in the spec saying that the protocol is
+        big or little endian
+       there's three cases: one byte values, symmetrical values or values
+        that are explicitly marked as little endian
+       for the sake of simplicity, we use little endian everywhere */
+    proto_tree_add_item(hdmi_tree, hf_hdmi_addr, tvb, offset, 1, ENC_LITTLE_ENDIAN);
+    offset += 1;
+
+    if (HDCP_ADDR8(addr)) {
+        tvbuff_t *hdcp_tvb;
+
+        hdcp_tvb = tvb_new_subset_remaining(tvb, offset);
+
+        return call_dissector(hdcp_handle, hdcp_tvb, pinfo, hdmi_tree);
+    }
+
+    if (addr == ADDR8_EDID_WRITE) {
+        col_append_sep_str(pinfo->cinfo, COL_INFO, NULL, "EDID request");
+        proto_tree_add_item(hdmi_tree, hf_hdmi_edid_offset,
+            tvb, offset, 1, ENC_LITTLE_ENDIAN);
+        offset += 1;
+        return offset;
+    }
+
+    return dissect_hdmi_edid(tvb, offset, pinfo, hdmi_tree);
+}
+
+static void
+hdmi_fmt_edid_version( gchar *result, guint32 revision )
+{
+   snprintf( result, ITEM_LABEL_LENGTH, "%d.%02d", (guint8)(( revision & 0xFF00 ) >> 8), (guint8)(revision & 0xFF) );
+}
+
+void
+proto_register_hdmi(void)
+{
+    static hf_register_info hf[] = {
+        { &hf_hdmi_addr,
+            { "8bit I2C address", "hdmi.addr", FT_UINT8, BASE_HEX,
+                VALS(hdmi_addr), 0, NULL, HFILL } },
+        { &hf_hdmi_edid_offset,
+            { "Offset", "hdmi.edid.offset",
+                FT_UINT8, BASE_HEX, NULL, 0, NULL, HFILL } },
+        { &hf_hdmi_edid_hdr,
+            { "EDID header", "hdmi.edid.hdr",
+                FT_UINT64, BASE_HEX, NULL, 0, NULL, HFILL } },
+        { &hf_hdmi_edid_manf_id,
+            { "Manufacturer ID", "hdmi.edid.manf_id",
+                FT_STRING, BASE_NONE, NULL, 0, NULL, HFILL } },
+        { &hf_hdmi_edid_manf_prod_code,
+            { "Manufacturer product code", "hdmi.edid.manf_prod_code",
+                FT_UINT16, BASE_HEX, NULL, 0, NULL, HFILL } },
+        { &hf_hdmi_edid_manf_serial,
+            { "Serial number", "hdmi.edid.serial_num",
+                FT_UINT32, BASE_DEC, NULL, 0, NULL, HFILL } },
+        { &hf_hdmi_edid_manf_week,
+            { "Week of manufacture", "hdmi.edid.manf_week",
+                FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL } },
+        { &hf_hdmi_edid_mod_year,
+            { "Model year", "hdmi.edid.model_year",
+                FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL } },
+        { &hf_hdmi_edid_manf_year,
+            { "Year of manufacture", "hdmi.edid.manf_year",
+                FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL } },
+        { &hf_hdmi_edid_version,
+            { "EDID Version", "hdmi.edid.version",
+                FT_UINT16, BASE_CUSTOM, CF_FUNC(hdmi_fmt_edid_version), 0, NULL, HFILL } }
+
+    };
+
+    static gint *ett[] = {
+        &ett_hdmi,
+        &ett_hdmi_edid
+    };
+
+    proto_hdmi = proto_register_protocol("High-Definition Multimedia Interface", "HDMI", "hdmi");
+    hdmi_handle = register_dissector("hdmi",  dissect_hdmi, proto_hdmi );
+
+    proto_register_field_array(proto_hdmi, hf, array_length(hf));
+    proto_register_subtree_array(ett, array_length(ett));
+}
+
+
+void
+proto_reg_handoff_hdmi(void)
+{
+    hdcp_handle = find_dissector_add_dependency("hdcp", proto_hdmi);
+    dissector_add_for_decode_as("i2c.message", hdmi_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:
+ */