Adding upstream version 4.2.2.upstream/4.2.2

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

1 files changed, 190 insertions, 0 deletions

diff --git a/epan/dissectors/packet-pktgen.c b/epan/dissectors/packet-pktgen.c
new file mode 100644
index 00000000..ef1439ee
--- /dev/null
+++ b/epan/dissectors/packet-pktgen.c
@@ -0,0 +1,190 @@
+/* packet-pktgen.c
+ * Routines for "Linux pktgen" dissection
+ * Copyright 2006 _FF_
+ * Francesco Fondelli <francesco dot fondelli, gmail dot com>
+ *
+ * Wireshark - Network traffic analyzer
+ * By Gerald Combs <gerald@wireshark.org>
+ * Copyright 1998 Gerald Combs
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+/* FF:
+ * The linux packet generator is a tool to generate packets at very high speed in the kernel.
+ * See linux/net/core/pktgen.c and linux/Documentation/networking/pktgen.txt for more info.
+ */
+
+#include "config.h"
+
+#include <epan/packet.h>
+
+void proto_register_pktgen(void);
+void proto_reg_handoff_pktgen(void);
+
+/* magic num used for heuristic */
+#define PKTGEN_MAGIC 0xbe9be955
+
+/* Initialize the protocol and registered fields */
+static int proto_pktgen = -1;
+
+/* pktgen header */
+static int hf_pktgen_magic = -1;
+static int hf_pktgen_seqnum = -1;
+static int hf_pktgen_tvsec = -1;
+static int hf_pktgen_tvusec = -1;
+static int hf_pktgen_timestamp = -1;
+
+/* Initialize the subtree pointer */
+static gint ett_pktgen = -1;
+
+/* entry point */
+static gboolean dissect_pktgen(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
+{
+    proto_item *ti          = NULL;
+    proto_item *tmp         = NULL;
+    proto_tree *pktgen_tree = NULL;
+    guint32     offset      = 0;
+    nstime_t    tstamp;
+    guint32     magic;
+
+    /* check for min size */
+    if (tvb_reported_length(tvb) < 16) {  /* Not a PKTGEN packet. */
+        return FALSE;
+    }
+
+    /* check for magic number */
+    magic = tvb_get_ntohl(tvb,0);
+    if (magic != PKTGEN_MAGIC) {
+        /* Not a PKTGEN packet. */
+        return FALSE;
+    }
+
+
+    /* Make entries in Protocol column and Info column on summary display */
+
+    col_set_str(pinfo->cinfo, COL_PROTOCOL, "PKTGEN");
+
+    col_add_fstr(pinfo->cinfo, COL_INFO, "Seq: %u", tvb_get_ntohl(tvb, 4));
+
+    if (tree) {
+
+        /* create display subtree for the protocol */
+
+        ti = proto_tree_add_item(tree, proto_pktgen, tvb, 0, -1, ENC_NA);
+
+        pktgen_tree = proto_item_add_subtree(ti, ett_pktgen);
+
+        /* add items to the subtree */
+
+        proto_tree_add_item(pktgen_tree, hf_pktgen_magic, tvb, offset, 4, ENC_BIG_ENDIAN);
+        offset += 4;
+
+        proto_tree_add_item(pktgen_tree, hf_pktgen_seqnum, tvb, offset, 4, ENC_BIG_ENDIAN);
+        offset += 4;
+
+        tstamp.secs = tvb_get_ntohl(tvb, offset);
+        tmp = proto_tree_add_item(pktgen_tree, hf_pktgen_tvsec, tvb, offset, 4, ENC_BIG_ENDIAN);
+        proto_item_set_generated(tmp);
+        offset += 4;
+
+        tstamp.nsecs = tvb_get_ntohl(tvb, offset) /* microsecond on the wire so... */ * 1000;
+        tmp = proto_tree_add_item(pktgen_tree, hf_pktgen_tvusec, tvb, offset, 4, ENC_BIG_ENDIAN);
+        proto_item_set_generated(tmp);
+        offset += 4;
+
+        proto_tree_add_time(pktgen_tree, hf_pktgen_timestamp, tvb, offset - 8, 8, &tstamp);
+
+        if (tvb_reported_length_remaining(tvb, offset)) /* random data */
+            call_data_dissector(tvb_new_subset_remaining(tvb, offset), pinfo,
+            pktgen_tree);
+    }
+
+    return TRUE;
+}
+
+
+/* Register the protocol with Wireshark */
+void proto_register_pktgen(void)
+{
+    /* Setup list of header fields */
+
+    static hf_register_info hf[] = {
+
+        { &hf_pktgen_magic,
+          {
+              "Magic number", "pktgen.magic",
+              FT_UINT32, BASE_HEX, NULL, 0x0,
+              "The pktgen magic number", HFILL
+          }
+        },
+
+        { &hf_pktgen_seqnum,
+          {
+              "Sequence number", "pktgen.seqnum",
+              FT_UINT32, BASE_DEC, NULL, 0x0,
+              NULL, HFILL
+          }
+        },
+
+        { &hf_pktgen_tvsec,
+          {
+              "Timestamp tvsec", "pktgen.tvsec",
+              FT_UINT32, BASE_DEC, NULL, 0x0,
+              "Timestamp tvsec part", HFILL
+          }
+        },
+
+        { &hf_pktgen_tvusec,
+          {
+              "Timestamp tvusec", "pktgen.tvusec",
+              FT_UINT32, BASE_DEC, NULL, 0x0,
+              "Timestamp tvusec part", HFILL
+          }
+        },
+
+        { &hf_pktgen_timestamp,
+          {
+              "Timestamp", "pktgen.timestamp",
+              FT_ABSOLUTE_TIME, ABSOLUTE_TIME_LOCAL, NULL, 0x0,
+              NULL, HFILL
+          }
+        }
+    };
+
+    /* Setup protocol subtree array */
+
+    static gint *ett[] = {
+        &ett_pktgen
+    };
+
+    /* Register the protocol name and description */
+
+    proto_pktgen = proto_register_protocol("Linux Kernel Packet Generator", "PKTGEN", "pktgen");
+
+    /* Required function calls to register the header fields and subtrees used */
+
+    proto_register_field_array(proto_pktgen, hf, array_length(hf));
+    proto_register_subtree_array(ett, array_length(ett));
+}
+
+
+void proto_reg_handoff_pktgen(void)
+{
+    /* Register as a heuristic UDP dissector */
+    heur_dissector_add("udp", dissect_pktgen, "Linux Kernel Packet Generator over UDP", "pktgen_udp", proto_pktgen, HEURISTIC_ENABLE);
+}
+
+
+/*
+ * 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:
+ */