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Special Forums Cybersecurity ~ IPTables : Limit Incoming UDP Packets With a Certain Length ~ Post 302307356 by otheus on Wednesday 15th of April 2009 06:53:39 AM
Old 04-15-2009
I'm not sure, but the second "-m length --length 20" is redundant. You only get to that table if this condition is true. What I'm not clear about the length module is if it is the rule that gets limited or something else. If it's the rule, then this would drop any packet over 20 bytes after there have been 5 per second.

Do you want to limit it by IP address? Then I recommend you use the "recent" feature:

Code:
iptables -N CHECK1
iptables -A INPUT -p udp -m length --length 20 -j CHECK1

iptables -A CHECK1 -m recent --name longudp --rcheck 1 --hitcount 5 -j DROP
iptables -A CHECK1 -m recent --name longudp --set -j RETURN

 

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UDP(4)							   BSD Kernel Interfaces Manual 						    UDP(4)

NAME
udp -- Internet User Datagram Protocol SYNOPSIS
#include <sys/types.h> #include <sys/socket.h> #include <netinet/in.h> int socket(AF_INET, SOCK_DGRAM, 0); DESCRIPTION
UDP is a simple, unreliable datagram protocol which is used to support the SOCK_DGRAM abstraction for the Internet protocol family. UDP sockets are connectionless, and are normally used with the sendto(2) and recvfrom(2) calls, though the connect(2) call may also be used to fix the destination for future packets (in which case the recv(2) or read(2) and send(2) or write(2) system calls may be used). UDP address formats are identical to those used by TCP. In particular UDP provides a port identifier in addition to the normal Internet address format. Note that the UDP port space is separate from the TCP port space (i.e., a UDP port may not be ``connected'' to a TCP port). In addition broadcast packets may be sent (assuming the underlying network supports this) by using a reserved ``broadcast address''; this address is network interface dependent. Options at the IP transport level may be used with UDP; see ip(4). ERRORS
A socket operation may fail with one of the following errors returned: [EISCONN] when trying to establish a connection on a socket which already has one, or when trying to send a datagram with the desti- nation address specified and the socket is already connected; [ENOTCONN] when trying to send a datagram, but no destination address is specified, and the socket has not been connected; [ENOBUFS] when the system runs out of memory for an internal data structure; [EADDRINUSE] when an attempt is made to create a socket with a port which has already been allocated; [EADDRNOTAVAIL] when an attempt is made to create a socket with a network address for which no network interface exists. MIB VARIABLES
The udp protocol implements a number of variables in the net.inet branch of the sysctl(3) MIB. UDPCTL_CHECKSUM (udp.checksum) Enable udp checksums (enabled by default). UDPCTL_MAXDGRAM (udp.maxdgram) Maximum outgoing UDP datagram size UDPCTL_RECVSPACE (udp.recvspace) Maximum space for incoming UDP datagrams udp.log_in_vain For all udp datagrams, to ports on which there is no socket listening, log the connection attempt (disabled by default). udp.blackhole When a datagram is received on a port where there is no socket listening, do not return an ICMP port unreachable message. (Disabled by default. See blackhole(4).) SEE ALSO
getsockopt(2), recv(2), send(2), socket(2), blackhole(4), inet(4), intro(4), ip(4) HISTORY
The udp protocol appeared in 4.2BSD. BSD
June 5, 1993 BSD
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