1 files changed, 86 insertions, 0 deletions
diff --git a/tests/sys/netinet/redirect.py b/tests/sys/netinet/redirect.py
new file mode 100755
index 000000000000..2085d72fde2b
--- /dev/null
+++ b/tests/sys/netinet/redirect.py
@@ -0,0 +1,86 @@
+#!/usr/bin/env python
+# -
+# SPDX-License-Identifier: BSD-2-Clause
+#
+# Copyright (c) 2020 Alexander V. Chernikov
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in the
+#    documentation and/or other materials provided with the distribution.
+#
+# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+# SUCH DAMAGE.
+#
+#
+
+import argparse
+import logging
+logging.getLogger("scapy").setLevel(logging.CRITICAL)
+import scapy.all as sc
+import socket
+import sys
+import fcntl
+import struct
+
+
+def parse_args():
+    parser = argparse.ArgumentParser(description='ICMP redirect generator')
+    parser.add_argument('--smac', type=str, required=True,
+                        help='eth source mac')
+    parser.add_argument('--dmac', type=str, required=True,
+                        help='eth dest mac')
+    parser.add_argument('--sip', type=str, required=True,
+                        help='remote router source ip')
+    parser.add_argument('--dip', type=str, required=True,
+                        help='local router ip')
+    parser.add_argument('--iface', type=str, required=True,
+                        help='ifname to send packet to')
+    parser.add_argument('--route', type=str, required=True,
+                        help='destination IP to redirect')
+    parser.add_argument('--gw', type=str, required=True,
+                        help='redirect GW')
+    return parser.parse_args()
+
+
+def construct_icmp_redirect(smac, dmac, sip, dip, route_dst, route_gw):
+    e = sc.Ether(src=smac, dst=dmac)
+    l3 = sc.IP(src=sip, dst=dip)
+    icmp = sc.ICMP(type=5, code=1, gw=route_gw)
+    orig_ip = sc.IP(src=sip, dst=route_dst)
+    return e / l3 / icmp / orig_ip / sc.UDP()
+
+
+def send_packet(pkt, iface, feedback=False):
+    if feedback:
+        # Make kernel receive the packet as well
+        BIOCFEEDBACK = 0x8004427c
+        socket = sc.conf.L2socket(iface=args.iface)
+        fcntl.ioctl(socket.ins, BIOCFEEDBACK, struct.pack('I', 1))
+        sc.sendp(pkt, socket=socket, verbose=True)
+    else:
+        sc.sendp(pkt, iface=iface, verbose=False)
+
+
+def main():
+    args = parse_args()
+    pkt = construct_icmp_redirect(args.smac, args.dmac, args.sip, args.dip,
+                                  args.route, args.gw)
+    send_packet(pkt, args.iface)
+
+
+if __name__ == '__main__':
+    main()