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Commit Graph

27 Commits (c446abeb471d8be516bf11f0106797526b7122b3)

Author SHA1 Message Date
Victor Julien 57abba2e64 Coverity 1100842: add missing return statement 12 years ago
Eric Leblond 6f1cf9728e reject: delete debug line 12 years ago
Eric Leblond f05efeb46f Add reject for IPv6 
With this patch reject is now available in IPv6.
 12 years ago
Eric Leblond 5f224f87d1 reject: update computation of seq and ack 
We have follow TCP RFC (http://tools.ietf.org/html/rfc793#section-3.4).
There is two cases depending on wether the original packet contains a
ACK.
If packet has no ACK, the RST seq number is 0 and the ACK is built the
standard way.
If packet has a ACK, the seq of the RST packet is equal to the ACK of
incoming packet and the ACK is build using packet sequence number and
size of the data.

Regarding standard Ack number, it is computed using seq number of captured
packet added to packet length. Finally 1 is added so we respect the
RFC:
    If the ACK control bit is set this field contains the value of the
    next sequence number the sender of the segment is expecting to
    receive.  Once a connection is established this is always sent.

With this patch we have some correct results. With the following rule:
    reject ssh any any -> 192.168.56.3 any (msg:"no SSH  way"; sid:3; rev:1;)
ssh connection to 192.168.56.3 is correctly resetted on client side.

But this is not perfect. If we have the following rule:
    reject tcp any any -> 192.168.56.3 22 (msg:"no way"; sid:2; rev:1;)
then the connection is not resetted on a standard ethernet network. But
if we introduce 20ms delay on packets, then it is correctly resetted.
This is explained when looking at the network trace. The reset is sent
as answer to the SYN packet and it is emitted after the SYN ACK from
server because the exchange is really fast. So this is discarded by the
client OS which has already seen a ACK for the same sequence number.

This should fix #895.
 12 years ago
Eric Leblond 4e15cf2245 reject: fix typo 12 years ago
Eric Leblond efc12b24ae reject: use host-mode to set interface 
This patch update reject code to send the packet on the interface
it comes from when 'host-mode' is set to 'sniffer-only'. When
'host-mode' is set to 'router', the reject packet is sent via
the routing interface.

This should fix #957.
 12 years ago
Eric Leblond 9bbd2a103d reject: reindent and code cleaning 
Reindent file and use some switch instead of if else if.
 12 years ago
Victor Julien 820b0ded82 Add per packet profiling. 
Per packet profiling uses tick based accounting. It has 2 outputs, a summary
and a csv file that contains per packet stats.

Stats per packet include:
 1) total ticks spent
 2) ticks spent per individual thread module
 3) "threading overhead" which is simply calculated by subtracting (2) of (1).

A number of changes were made to integrate the new code in a clean way:
a number of generic enums are now placed in tm-threads-common.h so we can
include them from any part of the engine.

Code depends on --enable-profiling just like the rule profiling code.

New yaml parameters:

profiling:
  # packet profiling
  packets:

    # Profiling can be disabled here, but it will still have a
    # performance impact if compiled in.
    enabled: yes
    filename: packet_stats.log
    append: yes

    # per packet csv output
    csv:

      # Output can be disabled here, but it will still have a
      # performance impact if compiled in.
      enabled: no
      filename: packet_stats.csv

Example output of summary stats:

IP ver   Proto   cnt        min      max          avg
------   -----   ------     ------   ----------   -------
 IPv4       6     19436      11448      5404365     32993
 IPv4     256         4      11511        49968     30575

Per Thread module stats:

Thread Module              IP ver   Proto   cnt        min      max          avg
------------------------   ------   -----   ------     ------   ----------   -------
TMM_DECODEPCAPFILE          IPv4       6     19434       1242        47889      1770
TMM_DETECT                  IPv4       6     19436       1107       137241      1504
TMM_ALERTFASTLOG            IPv4       6     19436         90         1323       155
TMM_ALERTUNIFIED2ALERT      IPv4       6     19436        108         1359       138
TMM_ALERTDEBUGLOG           IPv4       6     19436         90         1134       154
TMM_LOGHTTPLOG              IPv4       6     19436        414      5392089      7944
TMM_STREAMTCP               IPv4       6     19434        828      1299159     19438

The proto 256 is a counter for handling of pseudo/tunnel packets.

Example output of csv:

pcap_cnt,ipver,ipproto,total,TMM_DECODENFQ,TMM_VERDICTNFQ,TMM_RECEIVENFQ,TMM_RECEIVEPCAP,TMM_RECEIVEPCAPFILE,TMM_DECODEPCAP,TMM_DECODEPCAPFILE,TMM_RECEIVEPFRING,TMM_DECODEPFRING,TMM_DETECT,TMM_ALERTFASTLOG,TMM_ALERTFASTLOG4,TMM_ALERTFASTLOG6,TMM_ALERTUNIFIEDLOG,TMM_ALERTUNIFIEDALERT,TMM_ALERTUNIFIED2ALERT,TMM_ALERTPRELUDE,TMM_ALERTDEBUGLOG,TMM_ALERTSYSLOG,TMM_LOGDROPLOG,TMM_ALERTSYSLOG4,TMM_ALERTSYSLOG6,TMM_RESPONDREJECT,TMM_LOGHTTPLOG,TMM_LOGHTTPLOG4,TMM_LOGHTTPLOG6,TMM_PCAPLOG,TMM_STREAMTCP,TMM_DECODEIPFW,TMM_VERDICTIPFW,TMM_RECEIVEIPFW,TMM_RECEIVEERFFILE,TMM_DECODEERFFILE,TMM_RECEIVEERFDAG,TMM_DECODEERFDAG,threading
1,4,6,172008,0,0,0,0,0,0,47889,0,0,48582,1323,0,0,0,0,1359,0,1134,0,0,0,0,0,8028,0,0,0,49356,0,0,0,0,0,0,0,14337

First line of the file contains labels.

2 example gnuplot scripts added to plot the data.
 14 years ago
Eric Leblond 8be92fdd99 SCTP support: add parsing of sctp 
This patch adds support of SCTP in all part of the code in charge
of decoding packets.
 15 years ago
William Metcalf 2eef905c07 GPL and Copyright header updates. 16 years ago
William Metcalf ce01927515 Import of GPLv2 Header 050410 16 years ago
Victor Julien 070ed778b8 Libcap-ng support by Gurvinder Singh and myself. Basic support for per thread caps is added, but not activated as it doesn't seem to work yet. Work around for incompatibility between libnet 1.1 and libcap-ng added. 16 years ago
William Metcalf 3678dda185 libnet now optional 16 years ago
Jan Jezek fe6a72befc Code is now compilable on the Win32 platform 16 years ago
Nick Rogness 2b7b78f1bf Intial IPFW support FreeBSD and OSX 16 years ago
Victor Julien ecf86f9c23 Rename to Suricata. 16 years ago
Victor Julien 0d0ffb9963 Reorganize header inclusions. 16 years ago
Victor Julien 6eaff4be12 Fixes for issues found by static code analyzer. 16 years ago
Brian Rectanus fa5939ca91 64 bit cleanup part2 17 years ago
Victor Julien 689bbfdc45 Rename all structure definitions in the "typedef struct _SomeStruct" format to "typedef struct SomeStruct_" to make the Doxygen output more useful. 
Remove the Trie multi pattern matcher code. It wasn't used anymore.
 17 years ago
Victor Julien 51a9e36e10 Remove vips references. Rename to eidps. 17 years ago
Victor Julien 657be002d1 Big detection engine update: scan improvements, b2g/b3g updates, bloom fixes, iponly detection implementation, dsize/flow grouping. 17 years ago
William Metcalf 85675ba066 added fix for compiler warning in reject code 17 years ago
William Metcalf 817d0e0855 added macros for ICMP defines 17 years ago
William Metcalf 7006085195 udp decoding added icmp unreachables added to reject 17 years ago
Victor Julien 3446566e44 Style cleanups for resets. 17 years ago
William Metcalf 0ffa1c2465 updates for configure.in, added reject code, some decode stuff for tcp 17 years ago