34a5582c47
Redirect (and temporal) route expiration was broken a while ago. This change brings route expiration back, with unified IPv4/IPv6 handling code. It introduces net.inet.icmp.redirtimeout sysctl, allowing to set an expiration time for redirected routes. It defaults to 10 minutes, analogues with net.inet6.icmp6.redirtimeout. Implementation uses separate file, route_temporal.c, as route.c is already bloated with tons of different functions. Internally, expiration is implemented as an per-rnh callout scheduled when route with non-zero rt_expire time is added or rt_expire is changed. It does not add any overhead when no temporal routes are present. Callout traverses entire routing tree under wlock, scheduling expired routes for deletion and calculating the next time it needs to be run. The rationale for such implemention is the following: typically workloads requiring large amount of routes have redirects turned off already, while the systems with small amount of routes will not inhibit large overhead during tree traversal. This changes also fixes netstat -rn display of route expiration time, which has been broken since the conversion from kread() to sysctl. Reviewed by: bz MFC after: 3 weeks Differential Revision: https://reviews.freebsd.org/D23075
86 lines
3.2 KiB
Python
Executable File
86 lines
3.2 KiB
Python
Executable File
#!/usr/bin/env python
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# -
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# SPDX-License-Identifier: BSD-2-Clause
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#
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# Copyright (c) 2020 Alexander V. Chernikov
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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# 1. Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# 2. Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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# SUCH DAMAGE.
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#
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# $FreeBSD$
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#
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import argparse
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import scapy.all as sc
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import socket
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import sys
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import fcntl
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import struct
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def parse_args():
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parser = argparse.ArgumentParser(description='ICMP redirect generator')
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parser.add_argument('--smac', type=str, required=True,
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help='eth source mac')
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parser.add_argument('--dmac', type=str, required=True,
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help='eth dest mac')
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parser.add_argument('--sip', type=str, required=True,
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help='remote router source ip')
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parser.add_argument('--dip', type=str, required=True,
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help='local router ip')
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parser.add_argument('--iface', type=str, required=True,
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help='ifname to send packet to')
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parser.add_argument('--route', type=str, required=True,
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help='destination IP to redirect')
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parser.add_argument('--gw', type=str, required=True,
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help='redirect GW')
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return parser.parse_args()
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def construct_icmp_redirect(smac, dmac, sip, dip, route_dst, route_gw):
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e = sc.Ether(src=smac, dst=dmac)
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l3 = sc.IP(src=sip, dst=dip)
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icmp = sc.ICMP(type=5, code=1, gw=route_gw)
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orig_ip = sc.IP(src=sip, dst=route_dst)
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return e / l3 / icmp / orig_ip / sc.UDP()
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def send_packet(pkt, iface, feedback=False):
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if feedback:
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# Make kernel receive the packet as well
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BIOCFEEDBACK = 0x8004427c
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socket = sc.conf.L2socket(iface=args.iface)
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fcntl.ioctl(socket.ins, BIOCFEEDBACK, struct.pack('I', 1))
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sc.sendp(pkt, socket=socket, verbose=True)
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else:
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sc.sendp(pkt, iface=iface, verbose=False)
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def main():
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args = parse_args()
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pkt = construct_icmp_redirect(args.smac, args.dmac, args.sip, args.dip,
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args.route, args.gw)
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send_packet(pkt, args.iface)
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if __name__ == '__main__':
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main()
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